From soumen08 at gmail.com  Fri May  1 00:00:08 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Fri, 1 May 2009 09:30:08 +0530
Subject: wxPython having trouble with frame objects
In-Reply-To: <f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com>
References: <mailman.4886.1241142872.11746.python-list@python.org>
	<5ddd5a7f-8c2b-4f39-a89e-376a3d646caf@t36g2000prt.googlegroups.com>
	<f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com>
Message-ID: <f6a09c160904302100j6782efdfl8eaf41441c06a0e7@mail.gmail.com>

Hello,
Another thing, here i tried changing self.frame_1 to
guithread.frame_1, so that that part of the code now reads:-

import wx,gui,threading
class guithread(threading.Thread):
    def run(self):
        app = wx.PySimpleApp(0)
        wx.InitAllImageHandlers()
        guithread.frame_1 = gui.MyFrame(None, -1, "")
        app.SetTopWindow(guithread.frame_1)
        guithread.frame_1.Show()
        app.MainLoop()
gui1=guithread()
gui1.start()
class changer(threading.Thread):
    def run(self):
        gui1.frame_1.text_ctrl_1.Setvalue("hello")
chang=changer()
chang.start()

I still get guithread object has no attribute frame_1. I must be doing
something wrong

On Fri, May 1, 2009 at 9:27 AM, Soumen banerjee <soumen08 at gmail.com> wrote:
> Hello,
> you say that ?frame_1 is an attribute of the main class. The main
> class here is guithread right? so any instance of guithread should
> also have an attribute called frame_1 isnt it? Excuse me if im getting
> this wrong, since i am somewhat new to python.
> Regards
> Soumen
>
> On Fri, May 1, 2009 at 9:05 AM, CM <cmpython at gmail.com> wrote:
>> On Apr 30, 9:54?pm, Soumen banerjee <soume... at gmail.com> wrote:
>>> Hello,
>>> I am using wxglade to design a gui which i am using in another script.
>>> Here are the codes
>>>
>>> The main file:
>>> import wx,gui,threading
>>> class guithread(threading.Thread):
>>> ? ?def run(self):
>>> ? ? ? ?app = wx.PySimpleApp(0)
>>> ? ? ? ?wx.InitAllImageHandlers()
>>> ? ? ? ?self.frame_1 = gui.MyFrame(None, -1, "")
>>> ? ? ? ?app.SetTopWindow(self.frame_1)
>>> ? ? ? ?self.frame_1.Show()
>>> ? ? ? ?app.MainLoop()
>>> gui1=guithread()
>>> gui1.start()
>>> class changer(threading.Thread):
>>> ? ?def run(self):
>>> ? ? ? ?gui1.frame_1.text_ctrl_1.Setvalue("hello")
>>> chang=changer()
>>> chang.start()
>>>
>>> and The GUI file (gui.py, imported in the above)
>>> import wx
>>>
>>> # begin wxGlade: extracode
>>> # end wxGlade
>>>
>>> class MyFrame(wx.Frame):
>>> ? ?def __init__(self, *args, **kwds):
>>> ? ? ? ?# begin wxGlade: MyFrame.__init__
>>> ? ? ? ?kwds["style"] = wx.DEFAULT_FRAME_STYLE
>>> ? ? ? ?wx.Frame.__init__(self, *args, **kwds)
>>> ? ? ? ?self.text_ctrl_1 = wx.TextCtrl(self, -1, "")
>>> ? ? ? ?self.slider_1 = wx.Slider(self, -1, 0, 0, 10)
>>> ? ? ? ?self.Open = wx.Button(self, -1, "Open")
>>> ? ? ? ?self.button_4 = wx.Button(self, -1, "Pause/Resume")
>>> ? ? ? ?self.button_5 = wx.Button(self, -1, "Quit")
>>>
>>> ? ? ? ?self.__set_properties()
>>> ? ? ? ?self.__do_layout()
>>>
>>> ? ? ? ?self.Bind(wx.EVT_COMMAND_SCROLL, self.slider, self.slider_1)
>>> ? ? ? ?self.Bind(wx.EVT_BUTTON, self.open, self.Open)
>>> ? ? ? ?self.Bind(wx.EVT_BUTTON, self.pause, self.button_4)
>>> ? ? ? ?self.Bind(wx.EVT_BUTTON, self.quit, self.button_5)
>>> ? ? ? ?# end wxGlade
>>>
>>> ? ?def __set_properties(self):
>>> ? ? ? ?# begin wxGlade: MyFrame.__set_properties
>>> ? ? ? ?self.SetTitle("frame_1")
>>> ? ? ? ?self.SetSize((522, 457))
>>> ? ? ? ?# end wxGlade
>>>
>>> ? ?def __do_layout(self):
>>> ? ? ? ?# begin wxGlade: MyFrame.__do_layout
>>> ? ? ? ?sizer_1 = wx.BoxSizer(wx.VERTICAL)
>>> ? ? ? ?sizer_2 = wx.BoxSizer(wx.VERTICAL)
>>> ? ? ? ?sizer_3 = wx.BoxSizer(wx.HORIZONTAL)
>>> ? ? ? ?sizer_2.Add(self.text_ctrl_1, 7, wx.EXPAND, 0)
>>> ? ? ? ?sizer_2.Add(self.slider_1, 0, wx.EXPAND, 0)
>>> ? ? ? ?sizer_3.Add(self.Open, 0, wx.LEFT, 70)
>>> ? ? ? ?sizer_3.Add((52, 20), 0, 0, 0)
>>> ? ? ? ?sizer_3.Add(self.button_4, 0, wx.ALIGN_CENTER_HORIZONTAL, 0)
>>> ? ? ? ?sizer_3.Add((55, 23), 0, 0, 0)
>>> ? ? ? ?sizer_3.Add(self.button_5, 0, 0, 0)
>>> ? ? ? ?sizer_2.Add(sizer_3, 1, wx.EXPAND, 0)
>>> ? ? ? ?sizer_1.Add(sizer_2, 1, wx.EXPAND, 0)
>>> ? ? ? ?self.SetSizer(sizer_1)
>>> ? ? ? ?self.Layout()
>>> ? ? ? ?# end wxGlade
>>>
>>> ? ?def slider(self, event): # wxGlade: MyFrame.<event_handler>
>>> ? ? ? ?print "Event handler `slider' not implemented!"
>>> ? ? ? ?event.Skip()
>>>
>>> ? ?def open(self, event): # wxGlade: MyFrame.<event_handler>
>>> ? ? ? ?print "Event handler `open' not implemented!"
>>> ? ? ? ?event.Skip()
>>>
>>> ? ?def pause(self, event): # wxGlade: MyFrame.<event_handler>
>>> ? ? ? ?print "Event handler `pause' not implemented!"
>>> ? ? ? ?event.Skip()
>>>
>>> ? ?def quit(self, event): # wxGlade: MyFrame.<event_handler>
>>> ? ? ? ?print "Event handler `quit' not implemented!"
>>> ? ? ? ?event.Skip()
>>>
>>> # end of class MyFrame
>>>
>>> if __name__ == "__main__":
>>> ? ?app = wx.PySimpleApp(0)
>>> ? ?wx.InitAllImageHandlers()
>>> ? ?frame_1 = MyFrame(None, -1, "")
>>> ? ?app.SetTopWindow(frame_1)
>>> ? ?frame_1.Show()
>>> ? ?app.MainLoop()
>>>
>>> The problem here is that when i run the main file, i am told that
>>> 'guithread' object has no attribute 'frame_1' whereas i seem to have
>>> defined
>>> self.frame_1=gui.MyFrame etc.
>>
>> Your statement above means that self--that is, the instance of
>> your main class--has an attribute called frame_1, and that name
>> refers to an instance of the MyFrame class from the gui module.
>>
>> It does not mean that the guithread object has an attribute named
>> frame_1. ?In order to do that, you should have written:
>>
>> guithread.frame_1 = something
>>
>>> The idea here is to access a gui element running in a thread from a
>>> separate thread. Please help
>>
>> I would post wxPython related questions on the wxPython mailing
>> list, which is excellent.
>> http://www.wxpython.org/maillist.php
>>
>> HTH,
>> Che
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>


From ldo at geek-central.gen.new_zealand  Fri May  1 00:30:19 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 01 May 2009 16:30:19 +1200
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz>
	<49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
Message-ID: <gtdtsr$qv1$3@lust.ihug.co.nz>

In message <pan.2009.04.30.00.29.35 at REMOVE.THIS.cybersource.com.au>, Steven 
D'Aprano wrote:

> The reason why Lawrence's insistence is so badly wrong becomes more
> apparent if you look at what you can do with boolean contexts other than
> simple `if` tests. Compare:
> 
> 
> for x in a or b or c:
>     do_something_with(x)
> 
> 
> versus:
> 
> 
> if len(a) > 0:
>     temp = a
> elif len(b) > 0:
>     temp = b
> elif len(c) > 0:
>     temp = c
> for x in temp:
>     do_something_with(x)

I have never written anything so unbelievable in my life. And I hope I never 
will.



From davea at ieee.org  Fri May  1 00:52:52 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 01 May 2009 00:52:52 -0400
Subject: wxPython having trouble with frame objects
In-Reply-To: <f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com>
References: <mailman.4886.1241142872.11746.python-list@python.org>	<5ddd5a7f-8c2b-4f39-a89e-376a3d646caf@t36g2000prt.googlegroups.com>
	<f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com>
Message-ID: <49FA8024.3060608@ieee.org>

Soumen banerjee wrote:
> Hello,
> you say that  frame_1 is an attribute of the main class. The main
> class here is guithread right? so any instance of guithread should
> also have an attribute called frame_1 isnt it? Excuse me if im getting
> this wrong, since i am somewhat new to python.
> Regards
> Soumen
>
> On Fri, May 1, 2009 at 9:05 AM, CM <cmpython at gmail.com> wrote:
>   
>> On Apr 30, 9:54 pm, Soumen banerjee <soume... at gmail.com> wrote:
>>     
>>> Hello,
>>> I am using wxglade to design a gui which i am using in another script.
>>> Here are the codes
>>>
>>> The main file:
>>> import wx,gui,threading
>>> class guithread(threading.Thread):
>>>    def run(self):
>>>        app =x.PySimpleApp(0)
>>>        wx.InitAllImageHandlers()
>>>        self.frame_1 =ui.MyFrame(None, -1, "")
>>>        app.SetTopWindow(self.frame_1)
>>>        self.frame_1.Show()
>>>        app.MainLoop()
>>> gui1=ithread()
>>> gui1.start()
>>> class changer(threading.Thread):
>>>    def run(self):
>>>        gui1.frame_1.text_ctrl_1.Setvalue("hello")
>>> chang=anger()
>>> chang.start()
>>>
>>> and The GUI file (gui.py, imported in the above)
>>> import wx
>>>
>>> # begin wxGlade: extracode
>>> # end wxGlade
>>>
>>> class MyFrame(wx.Frame):
>>>    def __init__(self, *args, **kwds):
>>>        # begin wxGlade: MyFrame.__init__
>>>        kwds["style"] =x.DEFAULT_FRAME_STYLE
>>>        wx.Frame.__init__(self, *args, **kwds)
>>>        self.text_ctrl_1 =x.TextCtrl(self, -1, "")
>>>        self.slider_1 =x.Slider(self, -1, 0, 0, 10)
>>>        self.Open =x.Button(self, -1, "Open")
>>>        self.button_4 =x.Button(self, -1, "Pause/Resume")
>>>        self.button_5 =x.Button(self, -1, "Quit")
>>>
>>>        self.__set_properties()
>>>        self.__do_layout()
>>>
>>>        self.Bind(wx.EVT_COMMAND_SCROLL, self.slider, self.slider_1)
>>>        self.Bind(wx.EVT_BUTTON, self.open, self.Open)
>>>        self.Bind(wx.EVT_BUTTON, self.pause, self.button_4)
>>>        self.Bind(wx.EVT_BUTTON, self.quit, self.button_5)
>>>        # end wxGlade
>>>
>>>    def __set_properties(self):
>>>        # begin wxGlade: MyFrame.__set_properties
>>>        self.SetTitle("frame_1")
>>>        self.SetSize((522, 457))
>>>        # end wxGlade
>>>
>>>    def __do_layout(self):
>>>        # begin wxGlade: MyFrame.__do_layout
>>>        sizer_1 =x.BoxSizer(wx.VERTICAL)
>>>        sizer_2 =x.BoxSizer(wx.VERTICAL)
>>>        sizer_3 =x.BoxSizer(wx.HORIZONTAL)
>>>        sizer_2.Add(self.text_ctrl_1, 7, wx.EXPAND, 0)
>>>        sizer_2.Add(self.slider_1, 0, wx.EXPAND, 0)
>>>        sizer_3.Add(self.Open, 0, wx.LEFT, 70)
>>>        sizer_3.Add((52, 20), 0, 0, 0)
>>>        sizer_3.Add(self.button_4, 0, wx.ALIGN_CENTER_HORIZONTAL, 0)
>>>        sizer_3.Add((55, 23), 0, 0, 0)
>>>        sizer_3.Add(self.button_5, 0, 0, 0)
>>>        sizer_2.Add(sizer_3, 1, wx.EXPAND, 0)
>>>        sizer_1.Add(sizer_2, 1, wx.EXPAND, 0)
>>>        self.SetSizer(sizer_1)
>>>        self.Layout()
>>>        # end wxGlade
>>>
>>>    def slider(self, event): # wxGlade: MyFrame.<event_handler>
>>>        print "Event handler `slider' not implemented!"
>>>        event.Skip()
>>>
>>>    def open(self, event): # wxGlade: MyFrame.<event_handler>
>>>        print "Event handler `open' not implemented!"
>>>        event.Skip()
>>>
>>>    def pause(self, event): # wxGlade: MyFrame.<event_handler>
>>>        print "Event handler `pause' not implemented!"
>>>        event.Skip()
>>>
>>>    def quit(self, event): # wxGlade: MyFrame.<event_handler>
>>>        print "Event handler `quit' not implemented!"
>>>        event.Skip()
>>>
>>> # end of class MyFrame
>>>
>>> if __name__ ="__main__":
>>>    app =x.PySimpleApp(0)
>>>    wx.InitAllImageHandlers()
>>>    frame_1 =yFrame(None, -1, "")
>>>    app.SetTopWindow(frame_1)
>>>    frame_1.Show()
>>>    app.MainLoop()
>>>
>>> The problem here is that when i run the main file, i am told that
>>> 'guithread' object has no attribute 'frame_1' whereas i seem to have
>>> defined
>>> self.frame_1=i.MyFrame etc.
>>>       
>> Your statement above means that self--that is, the instance of
>> your main class--has an attribute called frame_1, and that name
>> refers to an instance of the MyFrame class from the gui module.
>>
>> It does not mean that the guithread object has an attribute named
>> frame_1.  In order to do that, you should have written:
>>
>> guithread.frame_1 =omething
>>
>>     
>>> The idea here is to access a gui element running in a thread from a
>>> separate thread. Please help
>>>       
>> I would post wxPython related questions on the wxPython mailing
>> list, which is excellent.
>> http://www.wxpython.org/maillist.php
>>
>> HTH,
>> Che
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>     
Don't top-post. It puts things entirely out of order. Now the order of 
the parts of this message are 3, 1, 2, 4

Two things at least are wrong here, either of which is fatal.
   1) you have two threads doing GUI stuff.  Can't be done, at least not in wxPython.  Certain things can be done in a second thread, but definitely not constructing Frames and such.
   2) you have no synchronization between the two threads you start, so the changer thread may very well get to its usage of frame_1 long before guithread assigns it.  This is probably the cause of your current symptom.  Now, you could perhaps "fix" it by assigning it something in the guithread constructor (you don't define one), but although that'd get you further, problem #1 is fatal.





From rcdailey at gmail.com  Fri May  1 01:09:15 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Thu, 30 Apr 2009 22:09:15 -0700 (PDT)
Subject: subprocess & shared environments
Message-ID: <8c79f749-e648-4a2e-afad-4053a8ec5cbd@f41g2000pra.googlegroups.com>

I'm currently calling subprocess.call() on a batch file (in Windows)
that sets a few environment variables that are needed by further
processes started via subprocess.call(). How can I persist the
environment modifications by the first call() function? I've done my
own searching on this and I came up with nothing.

Help is appreciated.


From soumen08 at gmail.com  Fri May  1 01:12:43 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Fri, 1 May 2009 10:42:43 +0530
Subject: wxPython having trouble with frame objects
In-Reply-To: <49FA8024.3060608@ieee.org>
References: <mailman.4886.1241142872.11746.python-list@python.org>
	<5ddd5a7f-8c2b-4f39-a89e-376a3d646caf@t36g2000prt.googlegroups.com>
	<f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com>
	<49FA8024.3060608@ieee.org>
Message-ID: <f6a09c160904302212p7b9bb797m4e6942c2de12e10a@mail.gmail.com>

Hello,
Im not adding any GUI elements from the changer thread. Im just
attempting to change the value of a preexisting widget made in thread
one. The point is that i need to display text generated in thread 2 in
a GUI generated in thread 1.
As far as inter thread synchronization is concerned, i see your point.
So i took this approach

import wx,gui,threading
fix=0
i=1
class guithread(threading.Thread):
    def run(self):
        global fix
        app = wx.PySimpleApp(0)
        wx.InitAllImageHandlers()
        guithread.frame_1 = gui.MyFrame(None, -1, "")
        app.SetTopWindow(guithread.frame_1)
        guithread.frame_1.Show()
        print "setting fix"
        fix=1
        app.MainLoop()
gui1=guithread()
gui1.start()
class changer(threading.Thread):
    def run(self):
        print fix
        gui1.frame_1.text_ctrl_1.SetValue("hello")
print fix
while i:
    if fix == 1:
        print "starting changer"
        chang=changer()
        chang.start()
        i=0
This works, but is there anything simpler?
Regards
Soumen


From cs at zip.com.au  Fri May  1 01:22:26 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 1 May 2009 15:22:26 +1000
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <20090430223744.GA26332@cskk.homeip.net>
Message-ID: <20090501052226.GA6860@cskk.homeip.net>

On 01May2009 08:37, I wrote:
| On 30Apr2009 22:57, MRAB <google at mrabarnett.plus.com> wrote:
| > The producer could send just one None to indicate that it has finished
| > producing.
| > Each consumer could get the data from the queue, but if it's None then
| > put it back in the queue for the other consumer, then clean up and
| > finish.
| > When all the consumers have finished, the queue will contain just the
| > single None.
| 
| And as it happens I have an IterableQueue class right here which does
| _exact_ what was just described. You're welcome to it if you like.
| Added bonus is that, as the name suggests, you can use the class as
| an iterator:
|   for item in iterq:
|     ...
| The producer calls iterq.close() when it's done.

Someone asked, so code appended below.

Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

class IterableQueue(Queue): 
  ''' A Queue obeying the iterator protocol.
      Note: Iteration stops when a None comes off the Queue.
  '''

  def __init__(self, *args, **kw):
    ''' Initialise the queue.
    '''
    Queue.__init__(self, *args, **kw)
    self.__closed=False

  def put(self, item, *args, **kw):
    ''' Put an item on the queue.
    '''
    assert not self.__closed, "put() on closed IterableQueue"
    assert item is not None, "put(None) on IterableQueue"
    return Queue.put(self, item, *args, **kw)

  def _closeAtExit(self):
    if not self.__closed:
      self.close()

  def close(self):
    ##logFnLine("%s.close()"%(self,),frame=sys._getframe(1))
    if self.__closed:
      # this should be a real log message
      print >>sys.stderr, "close() on closed IterableQueue"
    else:
      self.__closed=True
      Queue.put(self,None)

  def __iter__(self):
    ''' Iterable interface for the queue.
    '''
    return self

  def next(self):
    item=self.get()
    if item is None:
      Queue.put(self,None)      # for another iterator
      raise StopIteration
    return item


From st1999 at gmail.com  Fri May  1 01:26:44 2009
From: st1999 at gmail.com (robean)
Date: Thu, 30 Apr 2009 22:26:44 -0700 (PDT)
Subject: urllib2 and threading
Message-ID: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>

I am writing a program that involves visiting several hundred webpages
and extracting specific information from the contents. I've written a
modest 'test' example here that uses a multi-threaded approach to
reach the urls with urllib2. The actual program will involve fairly
elaborate scraping and parsing (I'm using Beautiful Soup for that) but
the example shown here is simplified and just confirms the url of the
site visited.

Here's the problem: the script simply crashes after getting a a couple
of urls and takes a long time to run (slower that a non-threaded
version that I wrote and ran). Can anyone figure out what I am doing
wrong? I am new to both threading and urllib2, so its possible that
the SNAFU is quite obvious.

The urls are stored in a text file that I read from. The urls are all
valid, so there's no problem there.

Here's the code:

#!/usr/bin/python

import urllib2
import threading

class MyThread(threading.Thread):
  """subclass threading.Thread to create Thread instances"""
  def __init__(self, func, args):
    threading.Thread.__init__(self)
    self.func = func
    self.args = args

  def run(self):
    apply(self.func, self.args)


def get_info_from_url(url):
  """ A dummy version of the function simply visits urls and prints
the url of the page. """
  try:
    page = urllib2.urlopen(url)
  except urllib2.URLError, e:
    print "**** error ****", e.reason
  except urllib2.HTTPError, e:
    print "**** error ****", e.code

  else:
    ulock.acquire()
    print page.geturl() # obviously, do something more useful here,
eventually
    page.close()
    ulock.release()

ulock = threading.Lock()
num_links = 10
threads = [] # store threads here
urls = [] # store urls here

fh = open("links.txt", "r")
for line in fh:
  urls.append(line.strip())
fh.close()

# collect threads
for i in range(num_links):
  t = MyThread(get_info_from_url, (urls[i],) )
  threads.append(t)

# start the threads
for i in range(num_links):
  threads[i].start()

for i in range(num_links):
  threads[i].join()

print "all done"



From smichr at gmail.com  Fri May  1 02:13:54 2009
From: smichr at gmail.com (smichr)
Date: Thu, 30 Apr 2009 23:13:54 -0700 (PDT)
Subject: Modifying the value of a float-like object
References: <e89aa215-d9df-4159-8d0d-245ffb8f755a@u8g2000yqn.googlegroups.com>
	<pan.2009.04.15.03.35.14@REMOVE.THIS.cybersource.com.au>
	<87iql6v9cr.fsf@benfinney.id.au> 
	<aef29098-9d94-4f24-b246-a1806f0a9e32@v15g2000yqn.googlegroups.com> 
	<m2fxgakwqk.fsf@googlemail.com>
	<142274a6-a8f5-49ae-8b99-46d4dbe31246@e21g2000yqb.googlegroups.com>
	<m2bpqykk3h.fsf@googlemail.com>
	<ed232d90-1766-4745-bd57-2abcca10dfc4@z9g2000yqi.googlegroups.com>
Message-ID: <e084fd7b-e602-4ae2-af3b-80ac6bef958b@y34g2000prb.googlegroups.com>

On Apr 18, 4:21 pm, Eric.Le.Bi... at spectro.jussieu.fr wrote:
> On Apr 15, 5:33 pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
>
> I adjusted your code in a few ways, and put the result athttp://code.activestate.com/recipes/576721/(with due credit):
>
> 1) There was a strange behavior, which is fixed (by performing only
> dynamic calculations of UExpr, with an optimization through a new
> "constant" class):
>

Although normal arithmetic operations are correlated, the correlation
is lost (AFAICT) as soon as you use a function:

>>> a=Number_with_uncert(3,1);y=a+cos(a);y.error
1.0099083406911706
>>> #check it manually
>>> def f(a):
... 	return a+cos(a)
...
>>> h=1e-5;print (f(3+h)-f(3))/h
0.858884941879
>>> #check it analytically
>>> 1-sin(3)
0.85887999194013276

It's effectively creating a new variable, tmp=cos(a) so y looks like a
+tmp and the uncertainty in this is (a.error**2 + tmp.error**2)**.5:
>>> a
<class '__main__.Semi_formal_var'> object with result 3.0 +- 1
>>> cos(a)
<class '__main__.Semi_formal_var'> object with result -0.9899924966 +-
0.14112000806
>>> (1+0.14112000806**2)**.5
1.009908340729422

That result we got when requesting the error in y
We can also see that the a inside the cos() is invisible by taking the
derivative wrt a

>>> y.derivative_value(a)
0.99999999996214217

Also, this approach is limited in that only variables can be arguments
to functions, not node expressions. If x and d are variables, x/d
becomes an expression and you cannot compute sin(x/d). Or am I missing
something?

/c


From arnodel at googlemail.com  Fri May  1 02:24:42 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 01 May 2009 07:24:42 +0100
Subject: import and package confusion
References: <VYWdnUS5ddMkAmXUnZ2dnUVZ_tGdnZ2d@pdx.net>
	<20090429193621.GO32190@vnl.com> <49F8B4B1.4040705@Acm.Org>
	<20090429203403.GA4324@vnl.com> <49F8CF55.30705@Acm.Org>
	<mailman.4792.1241044312.11746.python-list@python.org>
	<_rOdnY_h8uTTQWXUnZ2dnUVZ_gKdnZ2d@pdx.net>
	<20090430001954.GC8373@vnl.com>
	<20090430063231.GI9749@nexus.in-nomine.org>
	<20090430140557.GA31415@vnl.com>
	<mailman.4852.1241102169.11746.python-list@python.org>
Message-ID: <m2eiv95oid.fsf@googlemail.com>

Dale Amon <amon at vnl.com> writes:

> Now I can move on to parsing those pesky Fortran card
> images... There wouldn't happen to be a way to take n
> continguous slices from a string (card image) where each 
> slice may be a different length would there? Fortran you 
> know. No spaces between input fields. :-)
>
> I know a way to do it, iterating over a list of slice sizes,
> perhaps in a list comprehension, but some of the august python 
> personages here no doubt know better ways.

It's a challenge to do it in a list comprehension, but here it is!

Warning: unpythonic code follows(*).  Sensitive readers may want to look
away now.

>>> data
'AAABBBBBCCCCCCCCCDD'
>>> field_sizes
[3, 5, 9, 2]
>>> [data[i:j] for j in [0] for s in field_sizes for i, j in [(j, j+s)]]
['AAA', 'BBBBB', 'CCCCCCCCC', 'DD']
>>> 

Now you can look again.

(*) Pythonicity is often much debated as it lies for a good part in the
eye of the snake charmer.  I don't think this snippet would generate
much debate!

-- 
Arnaud


From arnodel at googlemail.com  Fri May  1 02:28:51 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 01 May 2009 07:28:51 +0100
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
Message-ID: <m2ab5x5obg.fsf@googlemail.com>

Ross <ross.jett at gmail.com> writes:

> If I have a list of tuples a = [(1,2), (3,4), (5,6)], and I want to
> return a new list of each individual element in these tuples, I can do
> it with a nested for loop but when I try to do it using the list
> comprehension b = [j for j in i for i in a], my output is b =
> [5,5,5,6,6,6] instead of the correct b = [1,2,3,4,5,6]. What am I
> doing wrong?

When writing nested list comprehension, the for loops are in the same
order as you would write a normal nested for loop (which is not
necessarily intuitive when you first find out but is very handy in the
long run I think).

So write:

    [j for i in a for j in i]

-- 
Arnaud


From wuwei23 at gmail.com  Fri May  1 03:00:29 2009
From: wuwei23 at gmail.com (alex23)
Date: Fri, 1 May 2009 00:00:29 -0700 (PDT)
Subject: import and package confusion
References: <VYWdnUS5ddMkAmXUnZ2dnUVZ_tGdnZ2d@pdx.net>
	<20090429193621.GO32190@vnl.com> 
	<49F8B4B1.4040705@Acm.Org> <20090429203403.GA4324@vnl.com> 
	<49F8CF55.30705@Acm.Org>
	<mailman.4792.1241044312.11746.python-list@python.org> 
	<_rOdnY_h8uTTQWXUnZ2dnUVZ_gKdnZ2d@pdx.net>
	<20090430001954.GC8373@vnl.com> 
	<20090430063231.GI9749@nexus.in-nomine.org>
	<20090430140557.GA31415@vnl.com> 
	<mailman.4852.1241102169.11746.python-list@python.org>
	<m2eiv95oid.fsf@googlemail.com>
Message-ID: <11bee2fa-5a39-4f17-98d3-a6c1d5780b5d@s38g2000prg.googlegroups.com>

On May 1, 4:24?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
> It's a challenge to do it in a list comprehension, but here it is!
> >>> data
> 'AAABBBBBCCCCCCCCCDD'
> >>> field_sizes
> [3, 5, 9, 2]
> >>> [data[i:j] for j in [0] for s in field_sizes for i, j in [(j, j+s)]]
> ['AAA', 'BBBBB', 'CCCCCCCCC', 'DD']

Ugh. I know using a listcomp was the point but I find using struct so
much more elegant.

>>> import struct
>>> data = 'AAABBBBBCCCCCCCCCDD'
>>> format = '3s5s9s2s'
>>> struct.unpack(format, data)
('AAA', 'BBBBB', 'CCCCCCCCC', 'DD')

Friends don't let friends abuse list comprehensions.

I made sure the code works this time :)


From smichr at gmail.com  Fri May  1 03:19:43 2009
From: smichr at gmail.com (smichr)
Date: Fri, 1 May 2009 00:19:43 -0700 (PDT)
Subject: Modifying the value of a float-like object
References: <e89aa215-d9df-4159-8d0d-245ffb8f755a@u8g2000yqn.googlegroups.com>
	<pan.2009.04.15.03.35.14@REMOVE.THIS.cybersource.com.au>
	<87iql6v9cr.fsf@benfinney.id.au> 
	<aef29098-9d94-4f24-b246-a1806f0a9e32@v15g2000yqn.googlegroups.com> 
	<m2fxgakwqk.fsf@googlemail.com>
	<142274a6-a8f5-49ae-8b99-46d4dbe31246@e21g2000yqb.googlegroups.com>
	<m2bpqykk3h.fsf@googlemail.com>
	<ed232d90-1766-4745-bd57-2abcca10dfc4@z9g2000yqi.googlegroups.com>
	<e084fd7b-e602-4ae2-af3b-80ac6bef958b@y34g2000prb.googlegroups.com>
Message-ID: <269a0614-ffd4-4012-a9a0-e6ec0735348b@b7g2000pre.googlegroups.com>

On May 1, 11:13 am, smichr <smi... at gmail.com> wrote:
> Also, this approach is limited in that only variables can be arguments
> to functions, not node expressions. If x and d are variables, x/d
> becomes an expression and you cannot compute sin(x/d). Or am I missing
> something?
>

Note to self...it's best to restart with a fresh session if you've
been making modifications. everything appears to work fine without any
of the above observed problems:

>>> a=Number_with_uncert(3,1);y=a+cos(a);y.error
0.85888494187891229
>>> b=Number_with_uncert(4,1)
>>> cos(a/b)
<class '__main__.Semi_formal_expr_node'> object with result
0.731688868874 +- 0.213012112511

Sorry for the false alarm,
/c


From http  Fri May  1 03:22:22 2009
From: http (Paul Rubin)
Date: 01 May 2009 00:22:22 -0700
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz>
	<49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
Message-ID: <7xvdol1e4x.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
> for x in a or b or c:
>     do_something_with(x)

Ugh!!!!

  for x in [a,b,c]:
     if len(x) > 0:
       do_something_with(x)
       break


From yaksavage at gmail.com  Fri May  1 03:26:46 2009
From: yaksavage at gmail.com (thor)
Date: Fri, 1 May 2009 00:26:46 -0700 (PDT)
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<m2ab5x5obg.fsf@googlemail.com>
Message-ID: <d39da349-2b89-4cb1-b77e-6e208cd88ad0@q33g2000pra.googlegroups.com>

On May 1, 2:28?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
> Ross <ross.j... at gmail.com> writes:
> > If I have a list of tuples a = [(1,2), (3,4), (5,6)], and I want to
> > return a new list of each individual element in these tuples, I can do
> > it with a nested for loop but when I try to do it using the list
> > comprehension b = [j for j in i for i in a], my output is b =
> > [5,5,5,6,6,6] instead of the correct b = [1,2,3,4,5,6]. What am I
> > doing wrong?
>
> When writing nested list comprehension, the for loops are in the same
> order as you would write a normal nested for loop (which is not
> necessarily intuitive when you first find out but is very handy in the
> long run I think).
>
> So write:
>
> ? ? [j for i in a for j in i]
>
> --
> Arnaud
an trick
>>> a
[(1, 2), (3, 4), (5, 6)]
>>> sum(a, ())
(1, 2, 3, 4, 5, 6)
>>>
you may search the maillist , somebody questioned before


From http  Fri May  1 03:27:01 2009
From: http (Paul Rubin)
Date: 01 May 2009 00:27:01 -0700
Subject: urllib2 and threading
References: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
Message-ID: <7xr5z91dx6.fsf@ruckus.brouhaha.com>

robean <st1999 at gmail.com> writes:
> reach the urls with urllib2. The actual program will involve fairly
> elaborate scraping and parsing (I'm using Beautiful Soup for that) but
> the example shown here is simplified and just confirms the url of the
> site visited.

Keep in mind Beautiful Soup is pretty slow, so if you're doing a lot
of pages and have multiple cpu's, you probably want parallel processes
rather than threads.

> wrong? I am new to both threading and urllib2, so its possible that
> the SNAFU is quite obvious..
> ...
> ulock = threading.Lock()

Without looking at the code for more than a few seconds, using an
explicit lock like that is generally not a good sign.  The usual
Python style is to send all inter-thread communications through
Queues.  You'd dump all your url's into a queue and have a bunch of
worker threads getting items off the queue and processing them.  This
really avoids a lot of lock-related headache.  The price is that you
sometimes use more threads than strictly necessary.  Unless it's a LOT
of extra threads, it's usually not worth the hassle of messing with
locks.



From piet at cs.uu.nl  Fri May  1 03:45:29 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 01 May 2009 09:45:29 +0200
Subject: subprocess & shared environments
References: <8c79f749-e648-4a2e-afad-4053a8ec5cbd@f41g2000pra.googlegroups.com>
Message-ID: <m24ow5qnae.fsf@cs.uu.nl>

>>>>> Robert Dailey <rcdailey at gmail.com> (RD) wrote:

>RD> I'm currently calling subprocess.call() on a batch file (in Windows)
>RD> that sets a few environment variables that are needed by further
>RD> processes started via subprocess.call(). How can I persist the
>RD> environment modifications by the first call() function? I've done my
>RD> own searching on this and I came up with nothing.

Environments are propagated down the subprocess chain, not up. (I don't
know Windows good enough but I think this is also true on Windows.) What
you could do is have the batch file print the environment, read it in
your script and passing that environment to the other subprocesses. But
then why would you do it in a batch file? You could as well copy the
setting of the environment variables in your Python script. Or if the
batch file is supplied by another source, parse it and extract the
environment variables from it.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From li.wang.d at gmail.com  Fri May  1 04:03:22 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 1 May 2009 18:03:22 +1000
Subject: How to measure the memory cost in Python?
Message-ID: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com>

Hi everyone:

I want to measure the actual memory cost of a particular step in my program
(Python program), does anyone know if there is some function in Python could
help me to do this job? Or should I seek other tools to help me?

Thank you very much!

-- 
Li
------
Time is all we have
and you may find one day
you have less than you think
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From mu at problemlos.ch  Fri May  1 04:33:05 2009
From: mu at problemlos.ch (Kurt Mueller)
Date: Fri, 01 May 2009 10:33:05 +0200
Subject: string processing question
In-Reply-To: <3fbff25a-530e-4364-a7e1-3db6255b0d6b@k19g2000prh.googlegroups.com>
References: <mailman.4855.1241110874.11746.python-list@python.org>
	<3fbff25a-530e-4364-a7e1-3db6255b0d6b@k19g2000prh.googlegroups.com>
Message-ID: <49FAB3C1.70309@problemlos.ch>

Paul McGuire schrieb:
> --
> Weird. What happens if you change the second print statement to:
> print b.center(6,u"-")
Same behavior.


I have an even more minimal example:


:> python -c 'print unicode("?", "utf8")'
?

:> python -c 'print unicode("?", "utf8")' | cat
Traceback (most recent call last):
  File "<string>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode characters in position
0-1: ordinal not in range(128)


Just the difference of having piped the output to another program or to
a file.
Maybe we leave the other issue with the different centering for the moment.

My goal is to have my python programs unicode enabled.





TIA
-- 
Kurt Mueller

-- 
Kurt M?ller, mu at problemlos.ch 




From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 04:33:08 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 08:33:08 GMT
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz> <49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<7xvdol1e4x.fsf@ruckus.brouhaha.com>
Message-ID: <020aa73a$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 00:22:22 -0700, Paul Rubin wrote:

> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>> for x in a or b or c:
>>     do_something_with(x)
> 
> Ugh!!!!
> 
>   for x in [a,b,c]:
>      if len(x) > 0:
>        do_something_with(x)
>        break

What ugly, wasteful code. And it's *wrong* -- it doesn't do what my code 
does.

(1) Why build a list [a, b, c] that you don't need?

(2) Why assume that a, b and c are sequences with a fast __len__ method? 
They might be (say) linked lists that take O(N) to calculate the length, 
or binary trees that don't even have a length, but can be iterated over.

(3) And your code is wrong. I pass each element of the first non-empty 
sequence to do_something_with(). You pass the entire sequence. To do what 
my code does, you would need a nested for-loop like this:

for seq in [a,b,c]:
    if len(seq) > 0:
        for x in seq:
            do_something_with(x)
        break



-- 
Steven


From clp2 at rebertia.com  Fri May  1 04:42:02 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 1 May 2009 01:42:02 -0700
Subject: How to measure the memory cost in Python?
In-Reply-To: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com>
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com>
Message-ID: <50697b2c0905010142u628cb6f5t624b68e2860c8544@mail.gmail.com>

On Fri, May 1, 2009 at 1:03 AM, Li Wang <li.wang.d at gmail.com> wrote:
> Hi everyone:
>
> I want to measure the actual memory cost of a particular step in my program
> (Python program), does anyone know if there is some function in Python could
> help me to do this job? Or should I seek other tools to help me?

See Gabriel's answer in your other thread "Measure the memory cost in Python".
And please don't post duplicate threads asking essentially the same
question, especially when you were given a perfectly acceptable answer
and not that much time has past since you started the other thread.

Cheers,
Chris
-- 
http://blog.rebertia.com


From mail at microcorp.co.za  Fri May  1 04:49:22 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 1 May 2009 10:49:22 +0200
Subject: Multiprocessing.Queue - I want to end.
References: <200904301649.10341.kyrie@uh.cu>
Message-ID: <001201c9ca39$b9c4d140$0d00a8c0@Hendrik>

 "Luis Zarrabeitia" <akakyrie at uh.cu> wrote:

8< -------explanation and example of one producer, --------
8< -------more consumers and one queue --------------------

>As you can see, I'm sending one 'None' per consumer, and hoping that no 
>consumer will read more than one None. While this particular implementation 

You don't have to hope. You can write the consumers that way to guarantee it.

>ensures that, it is very fragile. Is there any way to signal the consumers? 

Signalling is not easy - you can signal a process, but I doubt if it is 
possible to signal a thread in a process.

>(or better yet, the queue itself, as it is shared by all consumers?) 
>Should "close" work for this? (raise the exception when the queue is 
>exhausted, not when it is closed by the producer).

I haven't the foggiest if this will work, and it seems to me to be kind
of involved compared to passing a sentinel or sentinels.

And while we are on the subject - Passing None as a sentinel is IMO as
good as or better than passing "XXZulu This is the End uluZXX",
or any other imaginative string that is not likely to occur naturally
in the input.

I have always wondered why people do the one queue many getters thing.

Given that the stuff you pass is homogenous in that it will require a
similar amount of effort to process, is there not a case to be made
to have as many queues as consumers, and to round robin the work?

And if the stuff you pass around needs disparate effort to consume,
it seems to me that you can more easily balance the load by having
specialised consumers, instead of instances of one humungous 
"I can eat anything" consumer.

I also think that having a queue per consumer thread makes it easier
to replace the threads with processes and the queues with pipes or
sockets if you need to do serious scaling later.

In fact I happen to believe that anything that does any work needs 
one and only one input queue and nothing else, but I am peculiar
that way.

- Hendrik




From phonethics at gmail.com  Fri May  1 04:53:33 2009
From: phonethics at gmail.com (Saurabh)
Date: Fri, 1 May 2009 14:23:33 +0530
Subject: returning values of a particular key from a dictionary
Message-ID: <a9ba20280905010153s1a58d6a7wedf0502146e0311b@mail.gmail.com>

arr = ({'x':'1', 'y':'a'}, {'x':'2', 'y':'b'}, {'x':'3', 'y':'c'})
print foo(arr, 'y')
['a','b','c']

I can write the function foo to return ['a','b','c'].
Is there some 'automatic'/built-in way to get this in Python ?

-- 
Phonethics


From http  Fri May  1 04:56:50 2009
From: http (Paul Rubin)
Date: 01 May 2009 01:56:50 -0700
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz>
	<49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<7xvdol1e4x.fsf@ruckus.brouhaha.com>
	<020aa73a$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <7xvdoldwvh.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> (2) Why assume that a, b and c are sequences with a fast __len__ method? 
> They might be (say) linked lists that take O(N) to calculate the length, 
> or binary trees that don't even have a length, but can be iterated over.

Why assume they have a bool method?  Or a __or__ operator?

> for seq in [a,b,c]:
>     if len(seq) > 0:
>         for x in seq:
>             do_something_with(x)
>         break

Eh.

   for seq in [a,b,c]:
     if sum(1 for x in imap(do_something_with, seq)) > 0:
       break


From http  Fri May  1 05:00:42 2009
From: http (Paul Rubin)
Date: 01 May 2009 02:00:42 -0700
Subject: returning values of a particular key from a dictionary
References: <mailman.4900.1241168016.11746.python-list@python.org>
Message-ID: <7xr5z9dwp1.fsf@ruckus.brouhaha.com>

Saurabh <phonethics at gmail.com> writes:
> arr = ({'x':'1', 'y':'a'}, {'x':'2', 'y':'b'}, {'x':'3', 'y':'c'})
> print foo(arr, 'y')
> ['a','b','c']

print list(a['y'] for a in arr)


From research at johnohagan.com  Fri May  1 05:03:50 2009
From: research at johnohagan.com (John O'Hagan)
Date: Fri, 1 May 2009 09:03:50 +0000
Subject: returning values of a particular key from a dictionary
In-Reply-To: <a9ba20280905010153s1a58d6a7wedf0502146e0311b@mail.gmail.com>
References: <a9ba20280905010153s1a58d6a7wedf0502146e0311b@mail.gmail.com>
Message-ID: <200905010903.51595.research@johnohagan.com>

On Fri, 1 May 2009, Saurabh wrote:
> arr = ({'x':'1', 'y':'a'}, {'x':'2', 'y':'b'}, {'x':'3', 'y':'c'})
> print foo(arr, 'y')
> ['a','b','c']
>
> I can write the function foo to return ['a','b','c'].
> Is there some 'automatic'/built-in way to get this in Python ?

List comprehension:

[i['y'] for i in arr]


Regards,

John


From mail at microcorp.co.za  Fri May  1 05:05:08 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 1 May 2009 11:05:08 +0200
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com><gt6kmp$i2g$3@lust.ihug.co.nz><49f85861$0$29010$426a74cc@news.free.fr><4t_Jl.37718$VA5.20343@tornado.fastwebnet.it><pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<7xvdol1e4x.fsf@ruckus.brouhaha.com>
Message-ID: <001f01c9ca3b$ed7c5740$0d00a8c0@Hendrik>

"Paul Rubin" <http://phr.cx at NOSPAM.invalid> wrote:


> Steven D'Aprano <stev at source.com.au> writes:
> > for x in a or b or c:
> >     do_something_with(x)
> 
> Ugh!!!!
> 
>   for x in [a,b,c]:
>      if len(x) > 0:
>        do_something_with(x)
>        break
> 
Ugh!!!!

for x in [a,b,c]:
    if x:
    do_something_with(x)
    break

:-)

- Hendrik



From clp2 at rebertia.com  Fri May  1 05:05:58 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 1 May 2009 02:05:58 -0700
Subject: returning values of a particular key from a dictionary
In-Reply-To: <a9ba20280905010153s1a58d6a7wedf0502146e0311b@mail.gmail.com>
References: <a9ba20280905010153s1a58d6a7wedf0502146e0311b@mail.gmail.com>
Message-ID: <50697b2c0905010205o63b1ab6coc84cf6a08e5e7372@mail.gmail.com>

On Fri, May 1, 2009 at 1:53 AM, Saurabh <phonethics at gmail.com> wrote:
> arr = ({'x':'1', 'y':'a'}, {'x':'2', 'y':'b'}, {'x':'3', 'y':'c'})
> print foo(arr, 'y')
> ['a','b','c']
>
> I can write the function foo to return ['a','b','c'].
> Is there some 'automatic'/built-in way to get this in Python ?

from operator import itemgetter
print map(itemgetter("y"), arr)

Cheers,
Chris
-- 
http://blog.rebertia.com


From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 05:11:22 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 09:11:22 GMT
Subject: bug with os.rename in 2.4.1?
References: <178473a3-906d-48e4-b84c-f9214d4fe708@w35g2000prg.googlegroups.com>
	<Xns9BFBBB5833A52duncanbooth@127.0.0.1>
	<f77e3266-09cb-4408-abee-523b787a5579@d38g2000prn.googlegroups.com>
	<slrngvejiq.t1f.nick@irishsea.home.craig-wood.com>
	<pan.2009.04.29.03.00.33@REMOVE.THIS.cybersource.com.au>
	<slrngvil9h.6rg.nick@irishsea.home.craig-wood.com>
Message-ID: <020ab030$0$20667$c3e8da3@news.astraweb.com>

On Thu, 30 Apr 2009 03:30:04 -0500, Nick Craig-Wood wrote:

>>  The race condition is still there. The only difference is that in the
>>  first case it fails noisily, with an exception, and in the second it
>>  fails quietly and does nothing.
> 
> I'd argue that since os.rename implements the syscall rename() and that
> is defined to be atomic (give or take) then the above is atomic and
> can't possibly be racy.

Ah, you're right, at least for systems where rename is atomic.

What I was trying to say is that the risk of the file *not* being renamed 
is still there, but in the first case the code failed noisily with an 
exception and in the second it just failed quietly. But that's wrong, the 
test is to see if the source file exists, not whether the destination 
file exists. If the destination file exists, and you have write-access to 
it, then it will be over-written no matter what.


-- 
Steven


From mu at problemlos.ch  Fri May  1 05:28:12 2009
From: mu at problemlos.ch (Kurt Mueller)
Date: Fri, 01 May 2009 11:28:12 +0200
Subject: string processing question
In-Reply-To: <bvKdncreYd1PdmTUnZ2dnUVZ_rSdnZ2d@pdx.net>
References: <mailman.4855.1241110874.11746.python-list@python.org>
	<bvKdncreYd1PdmTUnZ2dnUVZ_rSdnZ2d@pdx.net>
Message-ID: <49FAC0AC.2070905@problemlos.ch>

Scott David Daniels schrieb:
> To discover what is happening, try something like:
>     python -c 'for a in "?", unicode("?"): print len(a), a'
>
> I suspect that in your encoding, "?" is two bytes long, and in
> unicode it is converted to to a single character.

:> python -c 'for a in "?", unicode("?", "utf8"): print len(a), a'
2 ?
1 ?
:>

Yes it is. That is one of the two problems I see.
The solution for this is to unicode(<string>, <coding>) each string.


I'd like to have my python programs unicode enabled.




:> python -c 'for a in "?", unicode("?"): print len(a), a'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 0:
ordinal not in range(128)

It seems that the default encoding is "ascii", so unicode() cannot cope
with "?".
If I specify "utf8" for the encoding, unicode() works.

:> python -c 'for a in "?", unicode("?", "utf8"): print len(a), a'
2 ?
1 ?
:>                 


But the print statement yelds an UnicodeEncodeError
if I pipe the output to a program or a file.

:> python -c 'for a in "?", unicode("?", "utf8"): print len(a), a' | cat
Traceback (most recent call last):
  File "<string>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in
position 0: ordinal not in range(128)
2 ?
1 :>


So it seems to me, that piping the output changes the behavior of the
print statement:

:> python -c 'for a in "?", unicode("?", "utf8", "ignore"): print a,
len(a), type(a)'
? 2 <type 'str'>
? 1 <type 'unicode'>

:> python -c 'for a in "?", unicode("?", "utf8", "ignore"): print a,
len(a), type(a)'  | cat
Traceback (most recent call last):
  File "<string>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in
position 0: ordinal not in range(128)
? 2 <type 'str'>
:>




How can I achieve that my python programs are unicode enabled:
- Input strings can have different encodings (mostly ascii, latin_1 or utf8)
- My python programs should always output "utf8".

Is that a good idea??



TIA
-- 
Kurt M?ller, mu at problemlos.ch



From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 05:30:21 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 09:30:21 GMT
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz> <49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<gtdtsr$qv1$3@lust.ihug.co.nz>
Message-ID: <020ab4a3$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 16:30:19 +1200, Lawrence D'Oliveiro wrote:

> I have never written anything so unbelievable in my life. And I hope I
> never will.

I didn't say you did. If anyone thought I was quoting Lawrence's code, 
I'd be surprised. It was not my intention to put words into your mouth.

But seeing as you have replied, perhaps you could tell us something. 
Given so much you despise using non-bools in truth contexts, how would 
you re-write my example to avoid "a or b or c"?

for x in a or b or c:
    do_something_with(x)



-- 
Steven


From ldo at geek-central.gen.new_zealand  Fri May  1 05:40:41 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 01 May 2009 21:40:41 +1200
Subject: Light (general) Inter-Process Mutex/Wait/Notify Synchronization?
References: <mailman.4645.1240869985.11746.python-list@python.org>
	<7x3abthbc2.fsf@ruckus.brouhaha.com>
	<ab4fa3490904271745j5a9ba5dcpb66d6f94083a8b2a@mail.gmail.com>
	<4EEA4A39-1437-4AF1-93FF-F53B0EEB93AA@semanchuk.com>
	<mailman.4655.1240896009.11746.python-list@python.org>
	<49f729f5$0$1645$742ec2ed@news.sonic.net>
Message-ID: <gteg2p$666$1@lust.ihug.co.nz>

In message <49f729f5$0$1645$742ec2ed at news.sonic.net>, John Nagle wrote:

>      Linux doesn't do interprocess communication very well.
> ... and shared memory (unsafe).

What about with a futex?



From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 05:44:23 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 09:44:23 GMT
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz> <49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<7xvdol1e4x.fsf@ruckus.brouhaha.com>
	<020aa73a$0$20667$c3e8da3@news.astraweb.com>
	<7xvdoldwvh.fsf@ruckus.brouhaha.com>
Message-ID: <020ab7ed$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 01:56:50 -0700, Paul Rubin wrote:

> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
>> (2) Why assume that a, b and c are sequences with a fast __len__
>> method? They might be (say) linked lists that take O(N) to calculate
>> the length, or binary trees that don't even have a length, but can be
>> iterated over.
> 
> Why assume they have a bool method?  Or a __or__ operator?

What programming language are you using?

I'm using Python, where objects don't require either a bool or __or__ 
method (not operator) to work with the or operator.

>>> hasattr(None, '__or__') or hasattr(None, '__bool__') or \
... hasattr(None, '__nonzero__')
False
>>> 
>>> x = object()
>>> hasattr(x, '__or__') or hasattr(x, '__bool__') or \
... hasattr(x, '__nonzero__')
False
>>>
>>> None or x
<object object at 0xb7f3b4f0>

Any object can be used as an operand to the boolean operators.


> Eh.
> 
>    for seq in [a,b,c]:
>      if sum(1 for x in imap(do_something_with, seq)) > 0:
>        break

Did I stumble into an Obfuscated Python competition?




-- 
Steven


From gdamjan at gmail.com  Fri May  1 06:01:33 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Fri, 01 May 2009 12:01:33 +0200
Subject: Replacing files in a zip archive
References: <etloc6-t42.ln1@archaeopteryx.softver.org.mk>
	<eappc6-8m3.ln1@archaeopteryx.softver.org.mk>
	<6MmdnU-ISqVC3WfUnZ2dnUVZ_qCdnZ2d@pdx.net>
Message-ID: <ustqc6-h84.ln1@archaeopteryx.softver.org.mk>

> Which will produce the same output as the original, confounding
> your user.  You could just write the new values out, since .read
> picks the last entry (as I believe it should).  Alternatively, if
> you want to replace it "in place", you'll need a bit more smarts
> when there is more than one copy of a file in the archive (when
> z.namelist.count(filename) > 1).

I think I'll just hope that there will never be an ODF file like that, 
and if there is, then it's not my problem :)


-- 
?????? ( http://softver.org.mk/damjan/ )

Give me the knowledge to change the code I do not accept, 
the wisdom not to accept the code I cannot change, 
and the freedom to choose my preference.



From sion at viridian.paintbox  Fri May  1 06:46:34 2009
From: sion at viridian.paintbox (Sion Arrowsmith)
Date: Fri, 01 May 2009 10:46:34 GMT
Subject: string processing question
References: <mailman.4855.1241110874.11746.python-list@python.org>
	<3fbff25a-530e-4364-a7e1-3db6255b0d6b@k19g2000prh.googlegroups.com>
	<mailman.4897.1241166798.11746.python-list@python.org>
Message-ID: <eqAKl.2289$_e5.2089@newsfe21.ams2>

Kurt Mueller  <mu at problemlos.ch> wrote:
>:> python -c 'print unicode("?", "utf8")'
>?
>
>:> python -c 'print unicode("?", "utf8")' | cat
>Traceback (most recent call last):
>  File "<string>", line 1, in <module>
>UnicodeEncodeError: 'ascii' codec can't encode characters in position
>0-1: ordinal not in range(128)

$ python -c 'import sys; print sys.stdout.encoding'
UTF-8
$ python -c 'import sys; print sys.stdout.encoding' | cat
None

If print gets a Unicode string, it does an implicit
.encode(sys.stdout.encoding or sys.getdefaultencoding()) on it.
If you want your output to be guaranteed UTF-8, you'll need to
explicitly .encode("utf8") it yourself.

(I dare say this is slightly different in 3.x .)

-- 
\S

   under construction



From murali.au at gmail.com  Fri May  1 06:56:37 2009
From: murali.au at gmail.com (Murali kumar)
Date: Fri, 1 May 2009 16:26:37 +0530
Subject: problem in with keyword
Message-ID: <e4419f3f0905010356j1f5868cbn92ee309b5a22a108@mail.gmail.com>

hi all..

my application runs fine in windows xp using python 2.6 and wxpython 2.8.9

but in ubuntu 8.10 following error appears..  using python 2.5.2 and
wxpython 2.8.9

/home/murali/Desktop/mathdemo-configfinal/manageprofile.py:63: Warning:
'with' will become a reserved keyword in Python 2.6
Traceback (most recent call last):
  File "test.py", line 8, in <module>
    import manageprofile as managepf
  File "/home/murali/Desktop/mathdemo-configfinal/manageprofile.py", line 63
    with open(self.profile, 'wb') as configfile:
            ^
SyntaxError: invalid syntax

help for this problem..

Advanced thanks..
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From clp2 at rebertia.com  Fri May  1 07:12:37 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 1 May 2009 04:12:37 -0700
Subject: problem in with keyword
In-Reply-To: <e4419f3f0905010356j1f5868cbn92ee309b5a22a108@mail.gmail.com>
References: <e4419f3f0905010356j1f5868cbn92ee309b5a22a108@mail.gmail.com>
Message-ID: <50697b2c0905010412m172fe171v1162b8d26e02401b@mail.gmail.com>

On Fri, May 1, 2009 at 3:56 AM, Murali kumar <murali.au at gmail.com> wrote:
> hi all..
>
> my application runs fine in windows xp using python 2.6 and wxpython 2.8.9
>
> but in ubuntu 8.10 following error appears..? using python 2.5.2 and
> wxpython 2.8.9
>
> /home/murali/Desktop/mathdemo-configfinal/manageprofile.py:63: Warning:
> 'with' will become a reserved keyword in Python 2.6
> Traceback (most recent call last):
> ? File "test.py", line 8, in <module>
> ??? import manageprofile as managepf
> ? File "/home/murali/Desktop/mathdemo-configfinal/manageprofile.py", line 63
> ??? with open(self.profile, 'wb') as configfile:
> ??????????? ^
> SyntaxError: invalid syntax

According to PEP 343 (http://www.python.org/dev/peps/pep-0343/), the
`with` keyword was only added in Python 2.6

To use it in Python 2.5, you'd need to add:

from __future__ import with_statement

to any files using the `with` syntax. Or you could just upgrade to Python 2.6

Cheers,
Chris
-- 
http://blog.rebertia.com


From gabriel.rossetti at arimaz.com  Fri May  1 07:18:06 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Fri, 01 May 2009 13:18:06 +0200
Subject: Dynamically declared shared constant/variable imported twice problem
Message-ID: <49FADA6E.2080607@arimaz.com>

Hello everyone,

I have three modules A, B, C;

A declares this globally :

  UpdateEvent, UPDATE_EVENT_ID = wx.lib.newevent.NewEvent()

Then they import stuff from each other:

- A imports a constant from module B (in "__main__")
- A imports a class and some constants from module C
- B imports a constant from module A
- C imports UPDATE_EVENT_ID from module A

What happens is that since A imports stuff from B which then in turn
loads something from A, UPDATE_EVENT_ID gets redefined and when A sends
an event to C, C doesn't do anything since it doesn't have the same
UPDATE_EVENT_ID. Does anyone have an idea on how to fix this? If it had
been a statically defined variable then that wouldn't be "bad", but
since it's dynamic it does pose problems. More globally, how cn I
prevent this even with static constants? I don't think it's that great
to redefine the stuff multiple times and I've already had this problem
in the past with a constant dict.

Thank you,
Gabriel


From __peter__ at web.de  Fri May  1 07:37:39 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 01 May 2009 13:37:39 +0200
Subject: Dynamically declared shared constant/variable imported twice
	problem
References: <mailman.4911.1241176690.11746.python-list@python.org>
Message-ID: <gtemu0$213$02$1@news.t-online.com>

Gabriel Rossetti wrote:

> I have three modules A, B, C;
> 
> A declares this globally :
> 
>   UpdateEvent, UPDATE_EVENT_ID = wx.lib.newevent.NewEvent()
> 
> Then they import stuff from each other:
> 
> - A imports a constant from module B (in "__main__")
> - A imports a class and some constants from module C
> - B imports a constant from module A
> - C imports UPDATE_EVENT_ID from module A
> 
> What happens is that since A imports stuff from B which then in turn
> loads something from A, UPDATE_EVENT_ID gets redefined and when A sends
> an event to C, C doesn't do anything since it doesn't have the same
> UPDATE_EVENT_ID. Does anyone have an idea on how to fix this? If it had
> been a statically defined variable then that wouldn't be "bad", but
> since it's dynamic it does pose problems. More globally, how cn I
> prevent this even with static constants? I don't think it's that great
> to redefine the stuff multiple times and I've already had this problem
> in the past with a constant dict.

Imported modules are cached, so this problem shouldn't occur unless you use 
A.py as your main script. In this case it will be cached as "__main__", and 
if you import it elsewhere a second copy will be executed and cached as "A".

To fix it create a wrapper script that doesn't create any objects that will 
be used elsewhere, e. g.

#!/usr/bin/env python
import A
A.main()

assuming the function A.main() contains the code to start your application 
and invoke that instead of A.py

Peter



From venkatesh.th at gmail.com  Fri May  1 07:37:49 2009
From: venkatesh.th at gmail.com (venky)
Date: Fri, 1 May 2009 04:37:49 -0700 (PDT)
Subject: where to start with
Message-ID: <26ed4c2d-ac68-400c-9c5f-ceff0bfc6243@b7g2000pre.googlegroups.com>

Hi,

As iam very new to python i would like explore python. Can any body
guide me as your guidance is more worth than googling and finding it.

Thanks,
Venkat
http://www.prog2impress.com/


From clp2 at rebertia.com  Fri May  1 07:44:25 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 1 May 2009 04:44:25 -0700
Subject: where to start with
In-Reply-To: <26ed4c2d-ac68-400c-9c5f-ceff0bfc6243@b7g2000pre.googlegroups.com>
References: <26ed4c2d-ac68-400c-9c5f-ceff0bfc6243@b7g2000pre.googlegroups.com>
Message-ID: <50697b2c0905010444m775e4c16wf284e3209fd5352d@mail.gmail.com>

On Fri, May 1, 2009 at 4:37 AM, venky <venkatesh.th at gmail.com> wrote:
> Hi,
>
> As iam very new to python i would like explore python. Can any body
> guide me as your guidance is more worth than googling and finding it.

Good tutorials:
http://docs.python.org/tutorial/
http://diveintopython.org/toc/index.htm
http://openbookproject.net/thinkCSpy/index.xhtmll

To gain insight about Python's features and design:
http://www.python.org/dev/peps/pep-0000/

Cheers,
Chris
-- 
http://blog.rebertia.com


From opstad at batnet.com  Fri May  1 07:58:16 2009
From: opstad at batnet.com (opstad at batnet.com)
Date: Fri, 1 May 2009 04:58:16 -0700 (PDT)
Subject: Generator oddity
Message-ID: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>

I'm a little baffled by the inconsistency here. Anyone have any
explanations?

>>> def gen():
...   yield 'a'
...   yield 'b'
...   yield 'c'
...
>>> [c1 + c2 for c1 in gen() for c2 in gen()]
['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']

>>> list(c1 + c2 for c1 in gen() for c2 in gen())
['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']

>>> it1 = gen()
>>> it2 = gen()
>>> list(c1 + c2 for c1 in it1 for c2 in it2)
['aa', 'ab', 'ac']

Why does this last list only have three elements instead of nine?



From chambon.pascal at wanadoo.fr  Fri May  1 08:34:32 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Fri, 01 May 2009 14:34:32 +0200
Subject: Generator oddity
In-Reply-To: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
References: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
Message-ID: <49FAEC58.2000201@wanadoo.fr>

opstad at batnet.com a ?crit :
> I'm a little baffled by the inconsistency here. Anyone have any
> explanations?
>
>   
>>>> def gen():
>>>>         
> ...   yield 'a'
> ...   yield 'b'
> ...   yield 'c'
> ...
>   
>>>> [c1 + c2 for c1 in gen() for c2 in gen()]
>>>>         
> ['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']
>
>   
>>>> list(c1 + c2 for c1 in gen() for c2 in gen())
>>>>         
> ['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']
>
>   
>>>> it1 = gen()
>>>> it2 = gen()
>>>> list(c1 + c2 for c1 in it1 for c2 in it2)
>>>>         
> ['aa', 'ab', 'ac']
>
> Why does this last list only have three elements instead of nine?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
>   
When you use "for c2 in gen()]",  at each loop of c1, a new gen is 
instanciated and looped-over to continue building the list.
Whereas when you use "for c2 in it2)", it's always the same instance of 
gen which is used (it2), so after 3 loops on c2 this instance is 
exhausted, and the following iterations on c1 (and then attempts of 
looping on c2) don't give anything because the looping on c2 gives an 
exception "StopIteration".

Regards,
pascal


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From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 08:48:18 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 12:48:18 GMT
Subject: Generator oddity
References: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
Message-ID: <020ae308$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 04:58:16 -0700, opstad wrote:

> I'm a little baffled by the inconsistency here. Anyone have any
> explanations?
> 
>>>> def gen():
> ...   yield 'a'
> ...   yield 'b'
> ...   yield 'c'
> ...
>>>> [c1 + c2 for c1 in gen() for c2 in gen()]
> ['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']
> 
>>>> list(c1 + c2 for c1 in gen() for c2 in gen())
> ['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']
> 
>>>> it1 = gen()
>>>> it2 = gen()
>>>> list(c1 + c2 for c1 in it1 for c2 in it2)
> ['aa', 'ab', 'ac']
> 
> Why does this last list only have three elements instead of nine?


Ah, good one! That had me puzzled for a while too.

The answer is to write it out as a nested for-loop, using print in place 
of yield. Here's the first way:

for c1 in gen():
    for c2 in gen():
        print c1 + c2

And the second:

it1 = gen()
it2 = gen()
for c1 in it1:
    for c2 in it2:
        print c1 + c2


In the first example, the inner loop gets refreshed each time through the 
outer loop with a brand new instance of the generator. Expanding the 
loops in full:

# First method:
c1 = 'a'
call gen() to make an iterable
step through the fresh iterable, giving 'aa' 'ab' 'ac'
c1 = 'b'
call gen() to make an iterable
step through the fresh iterable, giving 'ba' 'bb' 'bc'
c1 = 'c'
call gen() to make an iterable
step through the fresh iterable, giving 'ca' 'cb' 'cc'


# Second method:
c1 = 'a'
inner iterable already exists
step through the iterable, giving 'aa' 'ab' 'ac'
c1 = 'b'
inner iterable is exhausted, so do nothing
c1 = 'c'
inner iterable is exhausted, so do nothing


And there you have it. A nice Gotcha for the books.



-- 
Steven


From duncan.booth at invalid.invalid  Fri May  1 08:53:01 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 1 May 2009 12:53:01 GMT
Subject: Generator oddity
References: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
Message-ID: <Xns9BFE8C95E989Bduncanbooth@127.0.0.1>

opstad at batnet.com wrote:

>>>> it1 = gen()
>>>> it2 = gen()
>>>> list(c1 + c2 for c1 in it1 for c2 in it2)
> ['aa', 'ab', 'ac']
> 
> Why does this last list only have three elements instead of nine?

First time through the c1 in it1 loop you use up all of the it2 values.
Second and third times through the c1 in it1 loop the it2 generator is 
still exhausted: you need to create a new generator each time if you want 
to repeat its values.


-- 
Duncan Booth http://kupuguy.blogspot.com


From opstad at batnet.com  Fri May  1 09:21:52 2009
From: opstad at batnet.com (opstad at batnet.com)
Date: Fri, 1 May 2009 06:21:52 -0700 (PDT)
Subject: Generator oddity
References: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
	<020ae308$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <c552d939-4e35-428d-83cf-1b176c21c43b@z8g2000prd.googlegroups.com>

D'oh! Many thanks for the explanation; I should have seen that myself.


From gabriel.rossetti at arimaz.com  Fri May  1 09:47:23 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Fri, 01 May 2009 15:47:23 +0200
Subject: Dynamically declared shared constant/variable imported twice
	problem
In-Reply-To: <gtemu0$213$02$1@news.t-online.com>
References: <mailman.4911.1241176690.11746.python-list@python.org>
	<gtemu0$213$02$1@news.t-online.com>
Message-ID: <49FAFD6B.6040906@arimaz.com>

Peter Otten wrote:
> Gabriel Rossetti wrote:
>
>   
>> I have three modules A, B, C;
>>
>> A declares this globally :
>>
>>   UpdateEvent, UPDATE_EVENT_ID = wx.lib.newevent.NewEvent()
>>
>> Then they import stuff from each other:
>>
>> - A imports a constant from module B (in "__main__")
>> - A imports a class and some constants from module C
>> - B imports a constant from module A
>> - C imports UPDATE_EVENT_ID from module A
>>
>> What happens is that since A imports stuff from B which then in turn
>> loads something from A, UPDATE_EVENT_ID gets redefined and when A sends
>> an event to C, C doesn't do anything since it doesn't have the same
>> UPDATE_EVENT_ID. Does anyone have an idea on how to fix this? If it had
>> been a statically defined variable then that wouldn't be "bad", but
>> since it's dynamic it does pose problems. More globally, how cn I
>> prevent this even with static constants? I don't think it's that great
>> to redefine the stuff multiple times and I've already had this problem
>> in the past with a constant dict.
>>     
>
> Imported modules are cached, so this problem shouldn't occur unless you use 
> A.py as your main script. In this case it will be cached as "__main__", and 
> if you import it elsewhere a second copy will be executed and cached as "A".
>
> To fix it create a wrapper script that doesn't create any objects that will 
> be used elsewhere, e. g.
>
> #!/usr/bin/env python
> import A
> A.main()
>
> assuming the function A.main() contains the code to start your application 
> and invoke that instead of A.py
>
> Peter
>
>   
Thank you Peter, I understand better now. I am indeed using A.py as my 
main script. I will create a launcher then, thank you.

Gabriel




From mu at problemlos.ch  Fri May  1 10:02:37 2009
From: mu at problemlos.ch (Kurt Mueller)
Date: Fri, 01 May 2009 16:02:37 +0200
Subject: string processing question
In-Reply-To: <eqAKl.2289$_e5.2089@newsfe21.ams2>
References: <mailman.4855.1241110874.11746.python-list@python.org>	<3fbff25a-530e-4364-a7e1-3db6255b0d6b@k19g2000prh.googlegroups.com>	<mailman.4897.1241166798.11746.python-list@python.org>
	<eqAKl.2289$_e5.2089@newsfe21.ams2>
Message-ID: <49FB00FD.8080007@problemlos.ch>

Sion Arrowsmith wrote:
> Kurt Mueller <mu at problemlos.ch> wrote:
>> :> python -c 'print unicode("?", "utf8")'
>> ?
>> :> python -c 'print unicode("?", "utf8")' | cat
>> Traceback (most recent call last):
>> File "<string>", line 1, in <module>
>> UnicodeEncodeError: 'ascii' codec can't encode characters in position
>> 0-1: ordinal not in range(128)
> $ python -c 'import sys; print sys.stdout.encoding'
> UTF-8
> $ python -c 'import sys; print sys.stdout.encoding' | cat
> None
>
> If print gets a Unicode string, it does an implicit
> .encode(sys.stdout.encoding or sys.getdefaultencoding()) on it.
> If you want your output to be guaranteed UTF-8, you'll need to
> explicitly .encode("utf8") it yourself.

This works now correct with and without piping:

python -c 'a=unicode("?", "utf8") ; print (a.encode("utf8"))'



In my python source code I have these two lines first:
#!/usr/bin/env python
# vim: set fileencoding=utf-8 :

So the source code itself and the strings in the source code
are interpreted as utf-8.

But from the command line python interprets the code
as 'latin_1' I presume. That is why I have to convert
the "?" with unicode().
Am I right?


> (I dare say this is slightly different in 3.x .)
I heard about it but I wait to go to 3.x until its time to...




Thanks
-- 
Kurt Mueller

-- 
Kurt M?ller, mu at problemlos.ch 




From davea at ieee.org  Fri May  1 10:25:23 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 01 May 2009 10:25:23 -0400
Subject: Generator oddity
In-Reply-To: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
References: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
Message-ID: <49FB0653.6030603@ieee.org>

opstad at batnet.com wrote:
> I'm a little baffled by the inconsistency here. Anyone have any
> explanations?
>
>   
>>>> def gen():
>>>>         
> ...   yield 'a'
> ...   yield 'b'
> ...   yield 'c'
> ...
>   
>>>> [c1 + c2 for c1 in gen() for c2 in gen()]
>>>>         
> ['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']
>
>   
>>>> list(c1 + c2 for c1 in gen() for c2 in gen())
>>>>         
> ['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']
>
>   
>>>> it1 = gen()
>>>> it2 = gen()
>>>> list(c1 + c2 for c1 in it1 for c2 in it2)
>>>>         
> ['aa', 'ab', 'ac']
>
> Why does this last list only have three elements instead of nine?
>
>
>   
The problem is in it2, which is initialized only once.  Thus the second 
time you're going through the c2 loop, it doesn't have any more values.

If you need the indirection provided by those it1 and it2, you need to 
postpone the function evaluation, at least for it2.

I'd do
it1 = gen
it2 = gen

list(c1 + c2 for c1 in it1() for c2 in it2())
or more simply:
[c1 + c2 for c1 in it1() for c2 in it2()]






From andreengels at gmail.com  Fri May  1 10:31:44 2009
From: andreengels at gmail.com (Andre Engels)
Date: Fri, 1 May 2009 16:31:44 +0200
Subject: Generator oddity
In-Reply-To: <49FB0653.6030603@ieee.org>
References: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
	<49FB0653.6030603@ieee.org>
Message-ID: <6faf39c90905010731v4405d51fu34df9d8e4adeeb83@mail.gmail.com>

On Fri, May 1, 2009 at 4:25 PM, Dave Angel <davea at ieee.org> wrote:

> The problem is in it2, which is initialized only once. ?Thus the second time
> you're going through the c2 loop, it doesn't have any more values.
>
> If you need the indirection provided by those it1 and it2, you need to
> postpone the function evaluation, at least for it2.
>
> I'd do
> it1 = gen
> it2 = gen
>
> list(c1 + c2 for c1 in it1() for c2 in it2())
> or more simply:
> [c1 + c2 for c1 in it1() for c2 in it2()]

Another possibility would be to use the outcome of looping through the
generator rather than the generator itself:

it1 = list(gen())
it2 = list(gen())
[c1 + c2 for c1 in it1() for c2 in it2()]


-- 
Andr? Engels, andreengels at gmail.com


From james at agentultra.com  Fri May  1 10:31:45 2009
From: james at agentultra.com (J Kenneth King)
Date: Fri, 01 May 2009 10:31:45 -0400
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
Message-ID: <85ocucnbce.fsf@agentultra.com>

Chris Rebert <clp2 at rebertia.com> writes:

> On Thu, Apr 30, 2009 at 5:56 PM, Ross <ross.jett at gmail.com> wrote:
>> If I have a list of tuples a = [(1,2), (3,4), (5,6)], and I want to
>> return a new list of each individual element in these tuples, I can do
>> it with a nested for loop but when I try to do it using the list
>> comprehension b = [j for j in i for i in a], my output is b =
>> [5,5,5,6,6,6] instead of the correct b = [1,2,3,4,5,6]. What am I
>> doing wrong?
>
> Your comprehension is the identity comprehension (i.e. it effectively
> just copies the list as-is).
> What you're trying to do is difficult if not impossible to do as a
> comprehension.
>
> Here's another approach:
> b = list(itertools.chain.from_iterable(a))
>
> And without using a library function:
> b = []
> for pair in a:
>     for item in pair:
>         b.append(item)

This is much more clear than a nested comprehension.

I love comprehensions, but abusing them can lead to really dense and
difficult to read code.


From zealalot at gmail.com  Fri May  1 10:35:40 2009
From: zealalot at gmail.com (zealalot)
Date: Fri, 1 May 2009 07:35:40 -0700 (PDT)
Subject: Passing a function as an argument from within the same class?
Message-ID: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>

So, I'm trying to come up with a way to pass a method (from the same
class) as the default argument for another method in the same class.
Unfortunately though, I keep getting "self not defined" errors since
the class hasn't been read completely before it references itself.

Is there a better way of doing this?

--- CODE ---

class SomeClass():
    def doNothing(self):
        pass
    def function1(self):
        print "Running function 1."
    def function2(self, passedFunction=self.doNothing):
        print "Running passed function."
        passedFunction()

someObject = SomeClass()
someObject.function2(someobject.function1)

--- CODE ---

Thanks,
- Zealalot


From debatem1 at gmail.com  Fri May  1 10:38:49 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 1 May 2009 07:38:49 -0700 (PDT)
Subject: where to start with
References: <26ed4c2d-ac68-400c-9c5f-ceff0bfc6243@b7g2000pre.googlegroups.com>
Message-ID: <f1dcd5f7-2565-46a1-9d87-ed58a79c6fa1@y10g2000prc.googlegroups.com>

I'd add http://diveintopython.org/ to that list as you gain more
experience with Python, or if you already know at least one language.



From linuxguy123 at gmail.com  Fri May  1 10:41:09 2009
From: linuxguy123 at gmail.com (Linuxguy123)
Date: Fri, 01 May 2009 08:41:09 -0600
Subject: Python servlet for Java applet ?
In-Reply-To: <m2ws92tkgk.fsf@cs.uu.nl>
References: <mailman.4513.1240594464.11746.python-list@python.org>
	<m21vrhd2lv.fsf@cs.uu.nl>
	<mailman.4753.1241010895.11746.python-list@python.org>
	<m2ws92tkgk.fsf@cs.uu.nl>
Message-ID: <1241188869.3773.28.camel@localhost.localdomain>


On Thu, 2009-04-30 at 14:06 +0200, Piet van Oostrum wrote:

> Well, for a start, in the Python world the word 'servlet' isn't used
> much. So I assume it comes from your Java legacy and you actually mean
> 'any server-side python script' (in webware they use the term
> 'servlet', however).

<snip>

I agree that servlet isn't a Python term.  I should have put it in
quotes. 

Your reply was very instructive.  Thanks for taking the time to post
it. 

I am probably going to build my "servlet" as a simple Python socket
service. 

LG





From bearophileHUGS at lycos.com  Fri May  1 10:44:43 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 1 May 2009 07:44:43 -0700 (PDT)
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
Message-ID: <4a39ccba-56c0-400b-bd0b-60bbe042ba0d@d7g2000prl.googlegroups.com>

Zealalot, probably there are some ways to do that, but a simple one is
the following (not tested):

def function2(self, passed_function=None):
    if passed_function is None:
        passed_function = self.doNothing
    ...

Bye,
bearophile


From ppearson at nowhere.invalid  Fri May  1 10:48:51 2009
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 1 May 2009 14:48:51 GMT
Subject: What do you think of ShowMeDo
References: <b6671f88-bc04-42eb-aad1-5b212bcab1ef@z23g2000prd.googlegroups.com>
	<87tz48s7hm.fsf@benfinney.id.au>
	<52d28fba-ebf7-4bfb-b568-64304da650d5@w31g2000prd.googlegroups.com>
	<pan.2009.04.29.06.27.10@REMOVE.THIS.cybersource.com.au>
	<17bacf12-037f-4dda-8ee3-1b51d83ac654@z23g2000prd.googlegroups.com>
	<gtd6l3$1ph4$1@news.ett.com.ua>
Message-ID: <760gejF1af7reU1@mid.individual.net>

On Fri, 1 May 2009 07:53:35 +1000, Paul Hemans <darwin at nowhere.com> wrote:
[snip]
> them as they have been recorded in the anals of the web, however I 
.........................................^^^^^

That's the second time in this thread.  The first might have been
deliberate gross wordplay, but now it's time for somebody to point
out that maybe this word doesn't mean what you think it means.

-- 
To email me, substitute nowhere->spamcop, invalid->net.


From debatem1 at gmail.com  Fri May  1 10:50:06 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 1 May 2009 07:50:06 -0700 (PDT)
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
Message-ID: <39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com>

Make doNothing a classmethod.

class SomeClass:

    @classmethod
    def doNothing(cls):
        pass

    def function1(self):
        print "Running function 1"

    def function2(self, passedFunction=SomeClass.doNothing):
        print "Running passed function"
        passedFunction()

someObject = SomeClass()
someObject.function2()
someObject.function2(someObject.function1)




From debatem1 at gmail.com  Fri May  1 10:54:39 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 1 May 2009 07:54:39 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<mailman.4898.1241167327.11746.python-list@python.org>
Message-ID: <7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>

Not OP, but I'd actually like to know if there's an answer to this one
that doesn't involve platform-specific tools.



From invalid at invalid  Fri May  1 10:54:41 2009
From: invalid at invalid (Grant Edwards)
Date: Fri, 01 May 2009 09:54:41 -0500
Subject: What do you think of ShowMeDo
References: <b6671f88-bc04-42eb-aad1-5b212bcab1ef@z23g2000prd.googlegroups.com>
	<87tz48s7hm.fsf@benfinney.id.au>
	<52d28fba-ebf7-4bfb-b568-64304da650d5@w31g2000prd.googlegroups.com>
	<pan.2009.04.29.06.27.10@REMOVE.THIS.cybersource.com.au>
	<17bacf12-037f-4dda-8ee3-1b51d83ac654@z23g2000prd.googlegroups.com>
	<gtd6l3$1ph4$1@news.ett.com.ua> <760gejF1af7reU1@mid.individual.net>
Message-ID: <69ydne2K6eiskGbUnZ2dnUVZ_radnZ2d@posted.visi>

On 2009-05-01, Peter Pearson <ppearson at nowhere.invalid> wrote:
> On Fri, 1 May 2009 07:53:35 +1000, Paul Hemans <darwin at nowhere.com> wrote:
> [snip]
>> them as they have been recorded in the anals of the web, however I 
>.........................................^^^^^
>
> That's the second time in this thread.  The first might have been
> deliberate gross wordplay, but now it's time for somebody to point
> out that maybe this word doesn't mean what you think it means.

You've got to admit it's rather funny. :)

-- 
Grant Edwards                   grante             Yow! I just heard the
                                  at               SEVENTIES were over!!  And
                               visi.com            I was just getting in touch
                                                   with my LEISURE SUIT!!


From clp2 at rebertia.com  Fri May  1 11:04:16 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 1 May 2009 08:04:16 -0700
Subject: How to measure the memory cost in Python?
In-Reply-To: <7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com>
	<mailman.4898.1241167327.11746.python-list@python.org>
	<7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
Message-ID: <50697b2c0905010804k7ad376eapd43c9f6bc24bf7df@mail.gmail.com>

On Fri, May 1, 2009 at 7:54 AM, CTO <debatem1 at gmail.com> wrote:
> Not OP, but I'd actually like to know if there's an answer to this one
> that doesn't involve platform-specific tools.

sys.getsizeof() [a suggested solution] isn't platform-specific.

Cheers,
Chris
-- 
http://blog.rebertia.com


From st1999 at gmail.com  Fri May  1 11:09:06 2009
From: st1999 at gmail.com (robean)
Date: Fri, 1 May 2009 08:09:06 -0700 (PDT)
Subject: urllib2 and threading
References: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
	<7xr5z91dx6.fsf@ruckus.brouhaha.com>
Message-ID: <a89b4950-9db9-45ee-a9cd-efb5ca2e0dc8@x31g2000prc.googlegroups.com>

Thanks for your reply. Obviously you make several good points about
Beautiful Soup and Queue. But here's the problem: even if I do nothing
whatsoever with the threads beyond just visiting the urls with
urllib2, the program chokes. If I replace

  else:
    ulock.acquire()
    print page.geturl() # obviously, do something more useful
here,eventually
    page.close()
    ulock.release()

with

  else:
    pass

the urllib2 starts raising URLErrros after the first 3 - 5 urls have
been visited. Do you have any sense what in the threads is corrupting
urllib2's behavior?  Many thanks,

Robean



On May 1, 12:27?am, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> robean <st1... at gmail.com> writes:
> > reach the urls with urllib2. The actual program will involve fairly
> > elaborate scraping and parsing (I'm using Beautiful Soup for that) but
> > the example shown here is simplified and just confirms the url of the
> > site visited.
>
> Keep in mind Beautiful Soup is pretty slow, so if you're doing a lot
> of pages and have multiple cpu's, you probably want parallel processes
> rather than threads.
>
> > wrong? I am new to both threading and urllib2, so its possible that
> > the SNAFU is quite obvious..
> > ...
> > ulock = threading.Lock()
>
> Without looking at the code for more than a few seconds, using an
> explicit lock like that is generally not a good sign. ?The usual
> Python style is to send all inter-thread communications through
> Queues. ?You'd dump all your url's into a queue and have a bunch of
> worker threads getting items off the queue and processing them. ?This
> really avoids a lot of lock-related headache. ?The price is that you
> sometimes use more threads than strictly necessary. ?Unless it's a LOT
> of extra threads, it's usually not worth the hassle of messing with
> locks.



From zealalot at gmail.com  Fri May  1 11:11:01 2009
From: zealalot at gmail.com (zealalot)
Date: Fri, 1 May 2009 08:11:01 -0700 (PDT)
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
	<39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com>
Message-ID: <abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com>

On May 1, 10:50?am, CTO <debat... at gmail.com> wrote:
> Make doNothing a classmethod.
>
> class SomeClass:
>
> ? ? @classmethod
> ? ? def doNothing(cls):
> ? ? ? ? pass
>
> ? ? def function1(self):
> ? ? ? ? print "Running function 1"
>
> ? ? def function2(self, passedFunction=SomeClass.doNothing):
> ? ? ? ? print "Running passed function"
> ? ? ? ? passedFunction()
>
> someObject = SomeClass()
> someObject.function2()
> someObject.function2(someObject.function1)

It's not surprising, but I've never heard of a classmethod before.
Basically, I read that it basically removes the need for the 'self'
argument.  Very cool!

And thanks for the quick response,

- Zealalot


From kyle at kyleterry.com  Fri May  1 11:20:34 2009
From: kyle at kyleterry.com (Kyle Terry)
Date: Fri, 1 May 2009 08:20:34 -0700
Subject: where to start with
In-Reply-To: <f1dcd5f7-2565-46a1-9d87-ed58a79c6fa1@y10g2000prc.googlegroups.com>
References: <26ed4c2d-ac68-400c-9c5f-ceff0bfc6243@b7g2000pre.googlegroups.com>
	<f1dcd5f7-2565-46a1-9d87-ed58a79c6fa1@y10g2000prc.googlegroups.com>
Message-ID: <65a7ac1b0905010820u2e4309ib894fbcc0caa7713@mail.gmail.com>

On Fri, May 1, 2009 at 7:38 AM, CTO <debatem1 at gmail.com> wrote:

> I'd add http://diveintopython.org/ to that list as you gain more
> experience with Python, or if you already know at least one language.


Wasn't diveintopython in his list?

>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From __peter__ at web.de  Fri May  1 11:41:27 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 01 May 2009 17:41:27 +0200
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
	<39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com>
Message-ID: <gtf573$1mi$01$1@news.t-online.com>

CTO wrote:

> Make doNothing a classmethod.
> 
> class SomeClass:
> 
>     @classmethod
>     def doNothing(cls):
>         pass
> 
>     def function1(self):
>         print "Running function 1"
> 
>     def function2(self, passedFunction=SomeClass.doNothing):
>         print "Running passed function"
>         passedFunction()
> 
> someObject = SomeClass()
> someObject.function2()
> someObject.function2(someObject.function1)

To make that run without error you have to jump through a lot of hoops:

class SomeClass(object):
    @classmethod
    def doNothing(cls):
        pass
    def function1(self):
        print "Running function 1"

def function2(self, passedFunction=SomeClass.doNothing):
    print "Running passed function"
    passedFunction()

SomeClass.function2 = function2

someObject = SomeClass()
someObject.function2()
someObject.function2(someObject.function1)

And if you don't need access to the instance you may not need access to the 
class either. In this case you can simplify:

def doNothing():
    pass

class SomeClass(object):
    def function1(self):
        print "Running function 1"
    def function2(self, passedFunction=doNothing):
        print "Running passed function"
        passedFunction()

If you do need information about the state of the instance you can either 
pass it explicitly

class SomeClass(object):
    def doNothing(self):
        pass
    def function1(self):
        print "Running function 1"
    def function2(self, passedFunction=doNothing):
        print "Running passed function"
        passedFunction.__get__(self)()

or (better, I think) use a sentinel as shown by Bearophile.

Peter



From emile at fenx.com  Fri May  1 12:01:05 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 01 May 2009 09:01:05 -0700
Subject: list comprehension question
In-Reply-To: <85ocucnbce.fsf@agentultra.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
Message-ID: <gtf6ak$8a2$1@ger.gmane.org>

On 5/1/2009 7:31 AM J Kenneth King said...
> Chris Rebert <clp2 at rebertia.com> writes:
>> b = []
>> for pair in a:
>>     for item in pair:
>>         b.append(item)
> 
> This is much more clear than a nested comprehension.
> 
> I love comprehensions, but abusing them can lead to really dense and
> difficult to read code.

I disagree on dense and difficult, although I'll leave open the question 
of abuse.

b = [ item for pair in a for item in pair ]

This is exactly the code above expressed in comprehension form.

It's worth knowing that a list comprehension is structured identically 
to the equivalent for loop.  So it really is neither more dense nor more 
difficult to read.  Further, you can tell immediately from the start of 
the list comprehension what you've got -- in this case a list of item(s).

Here with some slight changes...

 >>> a = [(1, 2), (3, 4, 7), (5, 6)]
 >>> [ item for j in a if len(j)==2 for item in j if item % 2 ]
[1, 5]

...opposed to...

 >>> for j in a:
...     if len(j)==2:
...         for item in j:
...             if item % 2:
...                 b.append(item)
...
 >>> b
[1, 5]
 >>>

YMMV,

Emile




From Scott.Daniels at Acm.Org  Fri May  1 12:06:28 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 01 May 2009 09:06:28 -0700
Subject: string processing question
In-Reply-To: <mailman.4904.1241170101.11746.python-list@python.org>
References: <mailman.4855.1241110874.11746.python-list@python.org>	<bvKdncreYd1PdmTUnZ2dnUVZ_rSdnZ2d@pdx.net>
	<mailman.4904.1241170101.11746.python-list@python.org>
Message-ID: <O4CdnYOLBaqVgGbUnZ2dnUVZ_rqdnZ2d@pdx.net>

Kurt Mueller wrote:
> Scott David Daniels schrieb:
>> To discover what is happening, try something like:
>>     python -c 'for a in "?", unicode("?"): print len(a), a'
>>
>> I suspect that in your encoding, "?" is two bytes long, and in
>> unicode it is converted to to a single character.
> 
> :> python -c 'for a in "?", unicode("?", "utf8"): print len(a), a'
> 2 ?
> 1 ?
> :>
> 
> Yes it is. That is one of the two problems I see.
> The solution for this is to unicode(<string>, <coding>) each string.
> 
> 
> I'd like to have my python programs unicode enabled.
> 
> 
> 
> 
> :> python -c 'for a in "?", unicode("?"): print len(a), a'
> Traceback (most recent call last):
>   File "<string>", line 1, in <module>
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 0:
> ordinal not in range(128)
> 
> It seems that the default encoding is "ascii", so unicode() cannot cope
> with "?".
> If I specify "utf8" for the encoding, unicode() works.
> 
> :> python -c 'for a in "?", unicode("?", "utf8"): print len(a), a'
> 2 ?
> 1 ?
> :>                 
> 
> 
> But the print statement yelds an UnicodeEncodeError
> if I pipe the output to a program or a file.
> 
> :> python -c 'for a in "?", unicode("?", "utf8"): print len(a), a' | cat
> Traceback (most recent call last):
>   File "<string>", line 1, in <module>
> UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in
> position 0: ordinal not in range(128)
> 2 ?
> 1 :>
> 
> 
> So it seems to me, that piping the output changes the behavior of the
> print statement:
> 
> :> python -c 'for a in "?", unicode("?", "utf8", "ignore"): print a,
> len(a), type(a)'
> ? 2 <type 'str'>
> ? 1 <type 'unicode'>
> 
> :> python -c 'for a in "?", unicode("?", "utf8", "ignore"): print a,
> len(a), type(a)'  | cat
> Traceback (most recent call last):
>   File "<string>", line 1, in <module>
> UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in
> position 0: ordinal not in range(128)
> ? 2 <type 'str'>
> :>
> 
> 
> 
> 
> How can I achieve that my python programs are unicode enabled:
> - Input strings can have different encodings (mostly ascii, latin_1 or utf8)
> - My python programs should always output "utf8".
> 
> Is that a good idea??

OK, the issue here is your use of -c, rather than an actual source file.
I don't know how to make -c take the magic initial encoding line.
If you rely on ascii source, you are safe, but have to write things like
      ms = u'That would be na\u00EFve'
  or  ms = u'That would be na\xEFve.'
  or  ms = u'That would be na\N{LATIN SMALL LETTER I WITH DIAERESIS}ve.'

If you do put an encoding line in your source (first or second line):
      # -*- coding: utf-8 -*-
  or  # -*- coding: iso-8859-1 -*-
  or  # -*- coding: latin-1 -*-

you can (later in that file) simply use:
      ms = u'That would be na?ve.'

That is, I would avoid non-ascii source for plain strings in 2.X unless
you have a _very_ good reason; use it, instead, for unicode strings.

--Scott David Daniels
Scott.Daniels at Acm.Org


From arnodel at googlemail.com  Fri May  1 12:19:21 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 01 May 2009 17:19:21 +0100
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
Message-ID: <m263gk6bjq.fsf@googlemail.com>

Emile van Sebille <emile at fenx.com> writes:

> On 5/1/2009 7:31 AM J Kenneth King said...
>> Chris Rebert <clp2 at rebertia.com> writes:
>>> b = []
>>> for pair in a:
>>>     for item in pair:
>>>         b.append(item)
>>
>> This is much more clear than a nested comprehension.
>>
>> I love comprehensions, but abusing them can lead to really dense and
>> difficult to read code.
>
> I disagree on dense and difficult, although I'll leave open the
> question of abuse.
>
> b = [ item for pair in a for item in pair ]
>
> This is exactly the code above expressed in comprehension form.

If the comprehension above is an abuse, then every nested list
comprehension is an abuse of comprehensions so they might as well not be
in the language...

-- 
Arnaud


From sgeiger at councilforeconed.org  Fri May  1 12:24:05 2009
From: sgeiger at councilforeconed.org (Shane Geiger)
Date: Fri, 01 May 2009 12:24:05 -0400
Subject: list comprehension question
In-Reply-To: <50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>
Message-ID: <49FB2225.4030601@councilforeconed.org>

from goopy.functional import flatten  # 
http://sourceforge.net/projects/goog-goopy/
b = [(1,2), (3,4), (5,6)]
print flatten(b)



#from goopy.functional import flatten  # 
http://sourceforge.net/projects/goog-goopy/

def flatten(seq):
  """
  Returns a list of the contents of seq with sublists and tuples "exploded".
  The resulting list does not contain any sequences, and all inner sequences
  are exploded.  For example:

  >>> flatten([7,(6,[5,4],3),2,1])
  [7,6,5,4,3,2,1]
  """
  lst = []
  for el in seq:
    if type(el) == list or type(el) is tuple:
      lst.extend(flatten(el))
    else:
      lst.append(el)
  return lst



Chris Rebert wrote:
> On Thu, Apr 30, 2009 at 5:56 PM, Ross <ross.jett at gmail.com> wrote:
>   
>> If I have a list of tuples a = [(1,2), (3,4), (5,6)], and I want to
>> return a new list of each individual element in these tuples, I can do
>> it with a nested for loop but when I try to do it using the list
>> comprehension b = [j for j in i for i in a], my output is b =
>> [5,5,5,6,6,6] instead of the correct b = [1,2,3,4,5,6]. What am I
>> doing wrong?
>>     
>
> Your comprehension is the identity comprehension (i.e. it effectively
> just copies the list as-is).
> What you're trying to do is difficult if not impossible to do as a
> comprehension.
>
> Here's another approach:
> b = list(itertools.chain.from_iterable(a))
>
> And without using a library function:
> b = []
> for pair in a:
>     for item in pair:
>         b.append(item)
>
> Cheers,
> Chris
>   


-- 
Shane Geiger, IT Director
Council For Economic Education / www.councilforeconed.org
sgeiger at councilforeconed.org  / 402-438-8958

Teaching Opportunity



From warpcat at sbcglobal.net  Fri May  1 12:24:10 2009
From: warpcat at sbcglobal.net (warpcat)
Date: Fri, 1 May 2009 09:24:10 -0700 (PDT)
Subject: object query assigned variable name?
Message-ID: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>

I've passed this around some other groups, and I'm being told
"probably not possible".  But I thought I'd try here as well :)   I
*did* search first, and found several similar threads, but they
quickly tangented into other specifics of the language that were a bit
over my head :)  At any rate, here's a simple example, I'd love to
know if as shown, is somehow possible:

Given an object:

class Spam(object):
    def __init__(self):
        # stuff....

I'd like it to print, when instanced, something like this:

>>> s = Spam()
I?m assigned to s!

But it seems prohibitively hard (based on my web and forum searches)
for an object to know what variable name is has been assigned to when
created.  Querying 'self' in __init__ returns a memory location, not
the variable name passed in.

If you're wondering why I'm trying to figure this out, this is just
part of my continued learning of the language and pushing the bounds,
to see what is possible ;)

Any thoughts?


From chris at simplistix.co.uk  Fri May  1 12:26:29 2009
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 01 May 2009 17:26:29 +0100
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <49E60832.8030806@egenix.com>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com>
Message-ID: <49FB22B5.3040507@simplistix.co.uk>

M.-A. Lemburg wrote:
> """
> If the package really requires adding one or more directories on sys.path (e.g.
> because it has not yet been structured to support dotted-name import), a "path
> configuration file" named package.pth can be placed in either the site-python or
> site-packages directory.
> ...
> A typical installation should have no or very few .pth files or something is
> wrong, and if you need to play with the search order, something is very wrong.
> """

I'll say! I think .pth files are absolute evil and I wish they could 
just be banned.

+1 on anything that makes them closer to going away or reduces the 
possibility of yet another similar feature from hurting the 
comprehensibility of a python setup.

Chris

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk


From stefan_ml at behnel.de  Fri May  1 12:29:22 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 01 May 2009 18:29:22 +0200
Subject: urllib2 and threading
In-Reply-To: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
References: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
Message-ID: <49fb2363$0$31865$9b4e6d93@newsspool3.arcor-online.net>

robean wrote:
> I am writing a program that involves visiting several hundred webpages
> and extracting specific information from the contents. I've written a
> modest 'test' example here that uses a multi-threaded approach to
> reach the urls with urllib2. The actual program will involve fairly
> elaborate scraping and parsing (I'm using Beautiful Soup for that)

Try lxml.html instead. It often parses HTML pages better than BS, can parse
directly from HTTP/FTP URLs, frees the GIL doing so, and is generally a lot
faster and more memory friendly than the combination of urllib2 and BS,
especially when threading is involved. It also supports CSS selectors for
finding page content, so your "elaborate scraping" might actually turn out
to be a lot simpler than you think.

http://codespeak.net/lxml/

These might be worth reading:

http://blog.ianbicking.org/2008/12/10/lxml-an-underappreciated-web-scraping-library/
http://blog.ianbicking.org/2008/03/30/python-html-parser-performance/

Stefan


From chris at simplistix.co.uk  Fri May  1 12:30:16 2009
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 01 May 2009 17:30:16 +0100
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <49E60832.8030806@egenix.com>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com>
Message-ID: <49FB2398.5000708@simplistix.co.uk>

M.-A. Lemburg wrote:
> The much more common use case is that of wanting to have a base package
> installation which optional add-ons that live in the same logical
> package namespace.
> 
> The PEP provides a way to solve this use case by giving both developers
> and users a standard at hand which they can follow without having to
> rely on some non-standard helpers and across Python implementations.
> 
> My proposal tries to solve this without adding yet another .pth
> file like mechanism - hopefully in the spirit of the original Python
> package idea.

Okay, I need to issue a plea for a little help.

I think I kinda get what this PEP is about now, and as someone who wants 
  to ship a base package with several add-ons that live in the same 
logical package namespace, I'm very interested.

However, despite trying to follow this thread *and* having tried to read 
the PEP a couple of times, I still don't know how I'd go about doing this.

I did give some examples from what I'd be looking to do much earlier.

I'll ask again in the vague hope of you or someone else explaining 
things to me like I'm a 5 year old - something I'm mentally equipped to 
be well ;-)

In either of the proposals on the table, what code would I write and 
where to have a base package with a set of add-on packages?

Simple examples would be greatly appreciated, and might bring things 
into focus for some of the less mentally able bystanders - like myself!

cheers,

Chris

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk


From chris at simplistix.co.uk  Fri May  1 12:32:14 2009
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 01 May 2009 17:32:14 +0100
Subject: [Python-Dev] PEP 382: Namespace Packages
In-Reply-To: <20090415175704.966B13A4100@sparrow.telecommunity.com>
References: <49D4DA72.60401@v.loewis.de>
	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>
	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<20090415175704.966B13A4100@sparrow.telecommunity.com>
Message-ID: <49FB240E.8030905@simplistix.co.uk>

P.J. Eby wrote:
> At 06:15 PM 4/15/2009 +0200, M.-A. Lemburg wrote:
>> The much more common use case is that of wanting to have a base package
>> installation which optional add-ons that live in the same logical
>> package namespace.
> 
> Please see the large number of Zope and PEAK distributions on PyPI as 
> minimal examples that disprove this being the common use case.  

If you mean "the common use case as opposed to having code in the 
__init__.py of the namespace package", I think you'll find that's 
because people (especially me!) don't know how to do this, not because 
we don't want to!

Chris - who would actually like to know how to do this, with or without 
the PEP, and how to indicate interdependencies in situations like this 
to setuptools...

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk


From Scott.Daniels at Acm.Org  Fri May  1 12:33:19 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 01 May 2009 09:33:19 -0700
Subject: Passing a function as an argument from within the same class?
In-Reply-To: <abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com>
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
	<39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com>
	<abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com>
Message-ID: <tPCdne1GTdqxvmbUnZ2dnUVZ_t-dnZ2d@pdx.net>

zealalot wrote:
> On May 1, 10:50 am, CTO <debat... at gmail.com> wrote:
>> Make doNothing a classmethod.
>>
>> class SomeClass:
>>     @classmethod
>>     def doNothing(cls):
>>     ...
>>     def function2(self, passedFunction=SomeClass.doNothing):
>>         print "Running passed function"
>>         passedFunction()
>> ...
> It's not surprising, but I've never heard of a classmethod before.
> Basically, I read that it basically removes the need for the 'self'
> argument.  Very cool!

Careful, bearophiles' answer remains the best one.

The only reason your example worked is that you had already had
SomeClass defined (probably from a previous experiment).
At the time you are executing the "def" statements for the
methods of SomeClass, SomeClass is not yet defined.  the default
arguments are evaluated at "def" time, but the method body is
evaluated at methd invokation time (well past the time SomeClass
is fully built.

Typically, classmethod is used to provide alternate constructors
for a class, though it does have other uses.

--Scott David Daniels
Scott.Daniels at Acm.Org


From MrJean1 at gmail.com  Fri May  1 12:37:49 2009
From: MrJean1 at gmail.com (Jean)
Date: Fri, 1 May 2009 09:37:49 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<mailman.4898.1241167327.11746.python-list@python.org>
	<7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
Message-ID: <b44f9331-3bfe-422f-91c2-ec7dc06409db@s1g2000prd.googlegroups.com>

On May 1, 7:54?am, CTO <debat... at gmail.com> wrote:
> Not OP, but I'd actually like to know if there's an answer to this one
> that doesn't involve platform-specific tools.

Depending on what you need and the O/S you are using, this recipe may
help

  <http://code.activestate.com/recipes/286222/>

That recipe also appeared in the 2nd edition of the Python Cookbook,
see

  <http://books.google.com/books?
id=Q0s6Vgb98CQC&printsec=frontcover&dq=editions:ISBN0596001673#PPA334,M1>

/Jean Brouwers


From Scott.Daniels at Acm.Org  Fri May  1 12:40:13 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 01 May 2009 09:40:13 -0700
Subject: object query assigned variable name?
In-Reply-To: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
Message-ID: <NPSdnbVAKb1UuWbUnZ2dnUVZ_tOdnZ2d@pdx.net>

warpcat wrote:
> I've passed this around some other groups, and I'm being told
> "probably not possible".  But I thought I'd try here as well :)  ...
> Given an object:
>     class Spam(object):
>         def __init__(self):
>             # stuff....
> I'd like it to print, when instanced, something like this:
>>>> s = Spam()
> I?m assigned to s!
> 
> But it seems prohibitively hard (based on my web and forum searches)
> for an object to know what variable name is has been assigned to when
> created.

Here's an example of why it is impossibly hard.  What would you want the
following code to print?:

     print 'NoneUnique:', Spam() is Spam()

Objects are created and then used somehow (including being put
somewhere), not created int a "variable."

--Scott David Daniels
Scott.Daniels at Acm.Org



From martin at v.loewis.de  Fri May  1 12:41:03 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Fri, 01 May 2009 18:41:03 +0200
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <49FB2398.5000708@simplistix.co.uk>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB2398.5000708@simplistix.co.uk>
Message-ID: <49FB261F.9080306@v.loewis.de>

> In either of the proposals on the table, what code would I write and
> where to have a base package with a set of add-on packages?

I don't quite understand the question. Why would you want to write code
(except for the code that actually is in the packages)?

PEP 382 is completely declarative - no need to write code.

Regards,
Martin


From piet at cs.uu.nl  Fri May  1 12:46:18 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 01 May 2009 18:46:18 +0200
Subject: Multiprocessing Pool and functions with many arguments
References: <880bfeb5-cc71-4ff5-b7a6-ffd6404597f0@v23g2000pro.googlegroups.com>
Message-ID: <m2ws90py91.fsf@cs.uu.nl>

>>>>> "psaffrey at googlemail.com" <psaffrey at googlemail.com> (P) wrote:

>P> I'm trying to get to grips with the multiprocessing module, having
>P> only used ParallelPython before.

>P> based on this example:

>P> http://docs.python.org/library/multiprocessing.html#using-a-pool-of-workers

>P> what happens if I want my "f" to take more than one argument? I want
>P> to have a list of tuples of arguments and have these correspond the
>P> arguments in f, but it keeps complaining that I only have one argument
>P> (the tuple). Do I have to pass in a tuple and break it up inside f? I
>P> can't use multiple input lists, as I would with regular map.

You give the tuple of the arguments for the function:

def f(a, b, c):
    return a + b * c

pool = Pool(processes=4)              # start 4 worker processes

result = pool.apply(f, (2, 3, 4))    # evaluate "f(2, 3, 4)" 

Or if you have a list:

args = [ (2, 3, 4), # arguments for call 1
          (5, 6, 7) # arguments for call 2
        ]

print [pool.apply(f, a) for a in args]

However, as each call to apply wait for its results, this will execute
sequentially instead of parallel.

You can't use map directly as it works only with single argument functions. 
>>> print pool.map(f, args) 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/multiprocessing/pool.py", line 148, in map
    return self.map_async(func, iterable, chunksize).get()
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/multiprocessing/pool.py", line 422, in get
    raise self._value
TypeError: f() takes exactly 3 arguments (1 given)

Is that what you mean?

But you can use a wrapper function:

def wrapf(abc):
    return f(*abc)

[later...]

print pool.map(wrapf, args) 

This is covered in the examples section of multiprocessing (see
calculate and calculatestar for example).

Or you can use apply_async and later wait for the results:

results = [pool.apply_async(f, a) for a in args]
print [r.get() for r in results]

Now the calls to f are done in parallel, which you can check by putting
a sleep inside f.

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 12:48:32 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 16:48:32 GMT
Subject: object query assigned variable name?
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
Message-ID: <020b1b54$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 09:24:10 -0700, warpcat wrote:

> I'd like it to print, when instanced, something like this:
> 
>>>> s = Spam()
> I?m assigned to s!
> 
> But it seems prohibitively hard (based on my web and forum searches) for
> an object to know what variable name is has been assigned to when
> created.

Can't be done. Objects don't know what names they are bound to.

Furthermore, your question is based on an invalid assumption. Objects 
aren't necessarily bound to a single name, they can be bound to zero, 
one, or more names.

What name should Spam print in these examples?

alist = [1, 2, Spam(), 4]
alist.append(Spam())
x = y = z = Spam()



-- 
Steven


From Scott.Daniels at Acm.Org  Fri May  1 12:48:54 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 01 May 2009 09:48:54 -0700
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <mailman.4924.1241195061.11746.python-list@python.org>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<mailman.4924.1241195061.11746.python-list@python.org>
Message-ID: <Fv2dnQNefatOu2bUnZ2dnUVZ_rGdnZ2d@pdx.net>

Chris Withers wrote:
> M.-A. Lemburg wrote:
>> """
>> If the package really requires adding one or more directories on 
>> sys.path (e.g. because it has not yet been structured to support
>> dotted-name import), a "path configuration file" named package.pth
>> can be placed in either the site-python or site-packages directory....
> I'll say! I think .pth files are absolute evil and I wish they could 
> just be banned.
> +1 on anything that makes them closer to going away or reduces the 
> possibility of yet another similar feature from hurting the 
> comprehensibility of a python setup.

".pth" files are great when used in moderation. Especially when used
with the new per-user location searched when setting up sys.path.
I can move my current project's directory name into a .pth file that
I change as I switch projects.  I can also throw in a reference to
my convenience tools (dinky little functions and classes that I would
otherwise waste time scratching together each time I needed them).
They obviate the need to fiddle with site.py.

--Scott David Daniels
Scott.Daniels at Acm.Org



From chris at simplistix.co.uk  Fri May  1 12:58:18 2009
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 01 May 2009 17:58:18 +0100
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <49FB261F.9080306@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB2398.5000708@simplistix.co.uk> <49FB261F.9080306@v.loewis.de>
Message-ID: <49FB2A2A.4090606@simplistix.co.uk>

Martin v. L?wis wrote:
>> In either of the proposals on the table, what code would I write and
>> where to have a base package with a set of add-on packages?
> 
> I don't quite understand the question. Why would you want to write code
> (except for the code that actually is in the packages)?
> 
> PEP 382 is completely declarative - no need to write code.

"code" is anything I need to write to make this work...

So, what do I need to do?

Chris

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk


From jjposner at snet.net  Fri May  1 13:00:23 2009
From: jjposner at snet.net (John Posner)
Date: Fri, 01 May 2009 13:00:23 -0400
Subject: list comprehension question
In-Reply-To: <49FB2225.4030601@councilforeconed.org>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>
	<49FB2225.4030601@councilforeconed.org>
Message-ID: <49FB2AA7.6020403@snet.net>

Shane Geiger wrote:
>    if type(el) == list or type(el) is tuple:
A tiny improvement:

        if type(el) in (list, tuple):



From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 13:00:25 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 17:00:25 GMT
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
	<39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com>
	<abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com>
Message-ID: <020b1e1d$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 08:11:01 -0700, zealalot wrote:

> On May 1, 10:50?am, CTO <debat... at gmail.com> wrote:
>> Make doNothing a classmethod.
>>
>> class SomeClass:
>>
>> ? ? @classmethod
>> ? ? def doNothing(cls):
>> ? ? ? ? pass
>>
>> ? ? def function1(self):
>> ? ? ? ? print "Running function 1"
>>
>> ? ? def function2(self, passedFunction=SomeClass.doNothing):
>> ? ? ? ? print "Running passed function"
>> ? ? ? ? passedFunction()
>>
>> someObject = SomeClass()
>> someObject.function2()
>> someObject.function2(someObject.function1)
> 
> It's not surprising, but I've never heard of a classmethod before.
> Basically, I read that it basically removes the need for the 'self'
> argument.  Very cool!

Not so.

When you call an ordinary method (an "instance method"), Python 
automatically inserts the object itself as the first argument. So you 
need to define the method with one extra parameter, self.

(Using the name self is just a convention. You can call it anything you 
like.)

For classmethods, Python automatically inserts not the object itself, but 
the object's *class* as the first argument. So you still need to define 
the method with an extra parameter, only now the convention is to call is 
cls rather than self.

Here's an example:

class Test(object):
    x = 0  # class attribute
    def __init__(self, x):
        self.x = x  # instance attribute
    def spam(self):
        print self, self.x
    @classmethod
    def ham(cls):
        print cls, cls.x


And in use:

>>> t = Test(42)
>>> t.spam()
<__main__.Test object at 0xb7cccc6c> 42
>>> t.ham()
<class '__main__.Test'> 0


There is one other related built-in decorator, staticmethod(). 
staticmethod() tells Python not to pass any extra argument to the method. 
That means the inside a static method, you can't refer to either the 
instance (self) or the class! Needless to say, there aren't very many 
uses for staticmethod(). 



-- 
Steven


From drobinow at gmail.com  Fri May  1 13:03:56 2009
From: drobinow at gmail.com (David Robinow)
Date: Fri, 1 May 2009 13:03:56 -0400
Subject: object query assigned variable name?
In-Reply-To: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
Message-ID: <4eb0089f0905011003i49237d89w7e81f23b704d5aa9@mail.gmail.com>

On Fri, May 1, 2009 at 12:24 PM, warpcat <warpcat at sbcglobal.net> wrote:
> I've passed this around some other groups, and I'm being told
> "probably not possible". ?But I thought I'd try here as well :) ? I
> *did* search first, and found several similar threads, but they
> quickly tangented into other specifics of the language that were a bit
> over my head :) ?At any rate, here's a simple example, I'd love to
> know if as shown, is somehow possible:
>
> Given an object:
>
> class Spam(object):
> ? ?def __init__(self):
> ? ? ? ?# stuff....
>
> I'd like it to print, when instanced, something like this:
>
>>>> s = Spam()
> I?m assigned to s!
>
> But it seems prohibitively hard (based on my web and forum searches)
> for an object to know what variable name is has been assigned to when
> created. ?Querying 'self' in __init__ returns a memory location, not
> the variable name passed in.
>
> If you're wondering why I'm trying to figure this out, this is just
> part of my continued learning of the language and pushing the bounds,
> to see what is possible ;)
>
> Any thoughts?
> --
> http://mail.python.org/mailman/listinfo/python-list
>
Others have explained to you that this is not possible.
I'll just point out that your method for learning the language is not optimal.
If you had gotten a recipe to do what you asked, how would it help you
write better programs?
I suggest that you start programming. If you get stumped, feel free to ask here.


From warpcat at sbcglobal.net  Fri May  1 13:08:55 2009
From: warpcat at sbcglobal.net (AKEric)
Date: Fri, 1 May 2009 10:08:55 -0700 (PDT)
Subject: object query assigned variable name?
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
	<020b1b54$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <4ad92d8b-7c06-47ad-b3f4-a0da02498d81@s38g2000prg.googlegroups.com>

On May 1, 9:48?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Fri, 01 May 2009 09:24:10 -0700, warpcat wrote:
> > I'd like it to print, when instanced, something like this:
>
> >>>> s = Spam()
> > I?m assigned to s!
>
> > But it seems prohibitively hard (based on my web and forum searches) for
> > an object to know what variable name is has been assigned to when
> > created.
>
> Can't be done. Objects don't know what names they are bound to.
>
> Furthermore, your question is based on an invalid assumption. Objects
> aren't necessarily bound to a single name, they can be bound to zero,
> one, or more names.
>
> What name should Spam print in these examples?
>
> alist = [1, 2, Spam(), 4]
> alist.append(Spam())
> x = y = z = Spam()
>
> --
> Steven

And getting back all the pointers is fine with me.  But this sounds
like a dead end, and I was just looking for confirmation of that.
Thanks


From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 13:09:21 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 17:09:21 GMT
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
Message-ID: <020b2035$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 07:35:40 -0700, zealalot wrote:

> So, I'm trying to come up with a way to pass a method (from the same
> class) as the default argument for another method in the same class.
> Unfortunately though, I keep getting "self not defined" errors since the
> class hasn't been read completely before it references itself.
> 
> Is there a better way of doing this?

My first instinct is to say "Don't do that!", but let's see if there's a 
way to get what you want. It's actually very easy: just put the 
definition of the passed method before the method you want to use it in, 
then refer to it by name *without* self.

However, there is a catch: you need to manually pass in the instance, 
instead of letting Python do it for you.

class Spam(object):
    def ham(self):
        return "ham"
    def spam(self, func=ham):
        return "spam is a tasty %s-like food product" % func(self)


And in use:

>>> obj = Spam()
>>> obj.ham()
'ham'
>>> obj.spam()
'spam is a tasty ham-like food product'



-- 
Steven


From warpcat at sbcglobal.net  Fri May  1 13:16:26 2009
From: warpcat at sbcglobal.net (AKEric)
Date: Fri, 1 May 2009 10:16:26 -0700 (PDT)
Subject: object query assigned variable name?
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
	<mailman.4931.1241197439.11746.python-list@python.org>
Message-ID: <030ba85c-7b3a-47e3-a38d-338e04104579@x1g2000prh.googlegroups.com>

On May 1, 10:03?am, David Robinow <drobi... at gmail.com> wrote:
> On Fri, May 1, 2009 at 12:24 PM, warpcat <warp... at sbcglobal.net> wrote:
> > I've passed this around some other groups, and I'm being told
> > "probably not possible". ?But I thought I'd try here as well :) ? I
> > *did* search first, and found several similar threads, but they
> > quickly tangented into other specifics of the language that were a bit
> > over my head :) ?At any rate, here's a simple example, I'd love to
> > know if as shown, is somehow possible:
>
> > Given an object:
>
> > class Spam(object):
> > ? ?def __init__(self):
> > ? ? ? ?# stuff....
>
> > I'd like it to print, when instanced, something like this:
>
> >>>> s = Spam()
> > I?m assigned to s!
>
> > But it seems prohibitively hard (based on my web and forum searches)
> > for an object to know what variable name is has been assigned to when
> > created. ?Querying 'self' in __init__ returns a memory location, not
> > the variable name passed in.
>
> > If you're wondering why I'm trying to figure this out, this is just
> > part of my continued learning of the language and pushing the bounds,
> > to see what is possible ;)
>
> > Any thoughts?
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> Others have explained to you that this is not possible.
> I'll just point out that your method for learning the language is not optimal.
> If you had gotten a recipe to do what you asked, how would it help you
> write better programs?
> I suggest that you start programming. If you get stumped, feel free to ask here.

wow

No one has yet told me it isn't possible (until other posts in this
thread), they just alluded to it.  Common replies are "well, maybe
this way, or maybe that way".  I myself help on other language forums
(that I know far better than Python), and sometimes it's helpful for
someone to just say "no, you can't do it" (if you truly know you
can't), which is what I was looking for here.

But to argue the way I'm learning the language isn't optimal is a bit
short-sited, based on a single-post query.  It's valuable to both know
what you can, can't, should and shouldn't do, and one shouldn't be
debased for asking such questions.


From norseman at hughes.net  Fri May  1 13:19:15 2009
From: norseman at hughes.net (norseman)
Date: Fri, 01 May 2009 10:19:15 -0700
Subject: Importing modules
In-Reply-To: <op.us77a7bsx6zn5v@lepton.softlabbsas.com.ar>
References: <b6671f88-bc04-42eb-aad1-5b212bcab1ef@z23g2000prd.googlegroups.com>	<87tz48s7hm.fsf@benfinney.id.au>	<52d28fba-ebf7-4bfb-b568-64304da650d5@w31g2000prd.googlegroups.com>	<pan.2009.04.29.06.27.10@REMOVE.THIS.cybersource.com.au>	<17bacf12-037f-4dda-8ee3-1b51d83ac654@z23g2000prd.googlegroups.com>	<4eb0089f0904291713m3859c90yd0298a740967b149@mail.gmail.com>	<b1d973a70904291801q39854313ic4ca35863580a52a@mail.gmail.com>	<mailman.4818.1241065035.11746.python-list@python.org>	<a4d6108f-13d5-4adb-8bcc-c9772ea3af1f@d19g2000prh.googlegroups.com>	<49f9e0f8$0$7893$9a6e19ea@unlimited.newshosting.com>
	<op.us77a7bsx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <49FB2F13.4040906@hughes.net>

Gabriel Genellina wrote:
> En Thu, 30 Apr 2009 14:33:38 -0300, Jim Carlock escribi?:
> 
>> I'm messing around with a program right at the moment. It
>> ends up as two applications, one runs as a server and one
>> as a client which presents a Window. It almost works, so I
>> need to work through it to work out it's bugs, and I'll be
>> rewriting it in a couple other languages.
>>
>> Python looks fairly simple. It's a lot of "import" commands
>> and then "from" statements to do more importing. So I need
>> to figure out what the difference is between the two, as
>> the "from" seems to provide a way to identify what it wants
>> to import from the library/module.
> 
> Start by reading http://docs.python.org/tutorial
> In particular, section 6: Modules
> 
>> I find it odd that no one includes the FQFN and employs a
>> short name.
> 
> fully.qualified.module.name is long to type, error prone, and slow -- 
> Python has to resolve each dotted name at runtime, every time it's used.
> 
> So writting this is common:
> from fully.qualified.module import name
> and then, just use `name` in the code. By looking at the `import` lines, 
> usually located at the top, you know where a certain name comes from.
> 
> ...unless there are statements like this:
> from somemodule import *
> which are considered bad practice anyway.
> 
>> Nothing seems to get SET in the Environment to
>> identify where the library gets configured. I have to run
>> off to find help on the differences between "import" and
>> "from".
> 
> No need for that, usually. There is a default library search path that 
> is built relative to the interpreter location. That is, if the Python 
> interpreter used is /usr/some/fancy/directory/python, then the standard 
> library is at /usr/some/fancy/directory/lib/python2.6, additional 
> packages are at /usr/some/fancy/directory/lib/python2.6/site-packages, etc.
> 
> You *can* alter the search path by setting some environment variables, 
> but I don't like that.
> 
------------------------------
I would like to make a small comment here on Python locations.
Windows seems to have to have a slight difference.

...\python\Lib                   #py libs go here
...\pythonVer\Lib\site-packages  #addons usually go here same as Linux
...\pythonVer\libs             #seems to hold MicroSoft specific py libs


Like Gabriel - my Linux is same as he describes.
                except I don't have a /usr/...ory/python
                in my case it's all in   /usr/local/lib/python2.5
                  to keep it all in one place
                  /usr/local/bin   has the soft links to run it
                  (reduces PATH size.  /usr/local/bin  already there)

Which shows how flexible Python is.


OH - something you mentioned that didn't seem to be addressed.
import - load a complete library
from   - obtain specific 'function'(s) from a library

(from mylib import fopen, fclose     or  from mylib import f*
                    one or more           gets fopen, fclose, etc

  from mylib import fopen as myfopen   can be useful  myfopen(...)
                                       won't be confused with the system
                                       fopen(...)
  which is great for not having to  MyVeryLongNameLib.fopen()  :)
)

The cautionary note here is, IF two libs have a function with the same 
name and 'from' is used to get it from each, you wind up the last one
requested.
To alleviate the problem you can  open(...)  or mylib.open(...) and thus 
access both (or even more) in the same program.  Check the built-ins and 
the libs for name problems and use the techniques noted to get what you 
want.

Not sure what is in a given library?
import somelib
help(somelib)
   (and read)

When it come to showing off, Python has its moments!

HTH

Steve


From debatem1 at gmail.com  Fri May  1 13:26:12 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 1 May 2009 10:26:12 -0700 (PDT)
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
	<39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com> 
	<abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com> 
	<tPCdne1GTdqxvmbUnZ2dnUVZ_t-dnZ2d@pdx.net>
Message-ID: <8ac8111d-4f02-4de0-9c66-28b4efa004c3@k38g2000yqh.googlegroups.com>

> Careful, bearophiles' answer remains the best one.
>
> The only reason your example worked is that you had already had
> SomeClass defined (probably from a previous experiment).

Scott is correct, and if bearophile and I ever give you conflicting
advice, take bearophile's.

A (corrected) bit of code that might serve your purpose would be
as follows:

class SomeClass:

    def doNothing():
        pass

    def function1(self):
        print "running function 1"

    def function2(self, passedFunction=doNothing):
        print "running passed function"
        passedFunction()

again, though- bearophile's is the best, and most standard,
answer here


From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 13:33:03 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 17:33:03 GMT
Subject: object query assigned variable name?
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
	<mailman.4931.1241197439.11746.python-list@python.org>
Message-ID: <020b25c3$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 13:03:56 -0400, David Robinow wrote:

> Others have explained to you that this is not possible. I'll just point
> out that your method for learning the language is not optimal. If you
> had gotten a recipe to do what you asked, how would it help you write
> better programs?

Exactly the same way that knowing that lists have an append() method, but 
dicts do not, will help you to write better programs. If you don't know 
what tools the language offers, how are you supposed to write *any* 
programs, let alone "better" ones?


> I suggest that you start programming. If you get stumped, feel free to
> ask here.

There's nothing wrong with experimenting with your tools, getting a feel 
for what they can do, pushing the boundaries with them. You might not get 
any useful code out of such games, but when you start writing code, you 
will already know what tools are available.

Warpcat, don't be ashamed about experimenting with Python and learning 
the language before getting into "serious" programming. There's 
absolutely nothing wrong with such curiosity.


-- 
Steven


From emile at fenx.com  Fri May  1 13:36:25 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 01 May 2009 10:36:25 -0700
Subject: list comprehension question
In-Reply-To: <m263gk6bjq.fsf@googlemail.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>	<85ocucnbce.fsf@agentultra.com>	<mailman.4923.1241193638.11746.python-list@python.org>
	<m263gk6bjq.fsf@googlemail.com>
Message-ID: <gtfbsu$qf4$1@ger.gmane.org>

On 5/1/2009 9:19 AM Arnaud Delobelle said...
> Emile van Sebille <emile at fenx.com> writes:
>> On 5/1/2009 7:31 AM J Kenneth King said...
>>> I love comprehensions, but abusing them can lead to really dense and
>>> difficult to read code.
>> I disagree on dense and difficult, although I'll leave open the
>> question of abuse.
>>
>> b = [ item for pair in a for item in pair ]
>>
>> This is exactly the code above expressed in comprehension form.
> 
> If the comprehension above is an abuse, then every nested list
> comprehension is an abuse of comprehensions so they might as well not be
> in the language...
> 

I hope you didn't understand me to say that this usage is abuse.  That's 
certainly not what I mean.  I have, however, examples in my code base 
that _would_ qualify as abuse (mostly from pre dictionary comprehension 
vintage where I would build a dict from within a list comp), and I have 
seen enough from this group to know that abuse abounds, with only slight 
provocation.  :)

Fondly-remembering-byte-code-hacks-and-introspection-ly y'rs,

Emile



From martin at v.loewis.de  Fri May  1 13:38:12 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Fri, 01 May 2009 19:38:12 +0200
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <49FB2A2A.4090606@simplistix.co.uk>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB2398.5000708@simplistix.co.uk> <49FB261F.9080306@v.loewis.de>
	<49FB2A2A.4090606@simplistix.co.uk>
Message-ID: <49FB3384.1030106@v.loewis.de>

>>> In either of the proposals on the table, what code would I write and
>>> where to have a base package with a set of add-on packages?
>>
>> I don't quite understand the question. Why would you want to write code
>> (except for the code that actually is in the packages)?
>>
>> PEP 382 is completely declarative - no need to write code.
> 
> "code" is anything I need to write to make this work...
> 
> So, what do I need to do?

Ok, so create three tar files:

1. base.tar, containing

   simplistix/
   simplistix/__init__.py

2. addon1.tar, containing

   simplistix/addon1.pth (containing a single "*")
   simplistix/feature1.py

3. addon2.tar, containing

   simplistix/addon2.pth
   simplistix/feature2.py

Unpack each of them anywhere on sys.path, in any order.

Regards,
Martin


From mabdelkader at gmail.com  Fri May  1 13:39:39 2009
From: mabdelkader at gmail.com (ma)
Date: Fri, 1 May 2009 13:39:39 -0400
Subject: ctypes: reference of a struct member?
Message-ID: <148918f0905011039t1a9a8561nf36c6fe4534e3694@mail.gmail.com>

If I have this struct in C:

struct spam {
     int ham;
  char foo;
};


if I have this declaration:
struct spam s_;

If I wanted to pass a reference to a function of s_'s foo character, I
can do something like this:

somefunc(&s_.foo)

How do I do the same thing in ctypes?
ctypes.addressof(s_) + ctypes.sizeof(spam.foo)*(1)


From arnodel at googlemail.com  Fri May  1 13:52:30 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 01 May 2009 18:52:30 +0100
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<m263gk6bjq.fsf@googlemail.com>
	<mailman.4933.1241199339.11746.python-list@python.org>
Message-ID: <m21vr8678h.fsf@googlemail.com>

Emile van Sebille <emile at fenx.com> writes:

> On 5/1/2009 9:19 AM Arnaud Delobelle said...
>> Emile van Sebille <emile at fenx.com> writes:
>>> On 5/1/2009 7:31 AM J Kenneth King said...
>>>> I love comprehensions, but abusing them can lead to really dense and
>>>> difficult to read code.
>>> I disagree on dense and difficult, although I'll leave open the
>>> question of abuse.
>>>
>>> b = [ item for pair in a for item in pair ]
>>>
>>> This is exactly the code above expressed in comprehension form.
>>
>> If the comprehension above is an abuse, then every nested list
>> comprehension is an abuse of comprehensions so they might as well not be
>> in the language...
>>
>
> I hope you didn't understand me to say that this usage is abuse.

Emile: sorry, the way I was quoting earlier posts was unclear.  I was
refering to the post you quoted in your message, which describe the
nested list comprehension as abuse.  As supporting evidence for my reply
I included your example of nested list comprehension, which is one of
the simplest possible ones one can think of.

-- 
Arnaud


From debatem1 at gmail.com  Fri May  1 13:56:06 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 1 May 2009 10:56:06 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<mailman.4898.1241167327.11746.python-list@python.org>
	<7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
	<mailman.4921.1241190260.11746.python-list@python.org>
Message-ID: <ff9a9718-73a5-45f9-8c29-512cd344ac8b@r37g2000yqn.googlegroups.com>

> sys.getsizeof() [a suggested solution] isn't platform-specific.

So, to answer the OP's question, you'd just do something like

def get_totalsize(obj):
	total_size = sys.getsizeof(obj)
	for value in vars(obj).values():
		try: total_size += get_total_size(value)
		except: total_size += sys.getsizeof(value)
	return totalSize

def get_current_size(env):
	size = 0
	for value in env.values():
		try: size += get_total_size(value)
		except: pass
	return size

get_current_size(vars())

and discount the weight of the interpreter?


From shailen.tuli at gmail.com  Fri May  1 14:18:10 2009
From: shailen.tuli at gmail.com (shailen.tuli at gmail.com)
Date: Fri, 1 May 2009 11:18:10 -0700 (PDT)
Subject: urllib2 and threading
References: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
	<49fb2363$0$31865$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <2a5530c7-4442-45f1-bd36-4e708553e665@c18g2000prh.googlegroups.com>

For better performance, lxml easily outperforms Beautiful Soup.

For what its worth, the code runs fine if you switch from urllib2 to
urllib (different exceptions are raised, obviously). I have no
experience using urllib2 in a threaded environment, so I'm not sure
why it breaks; urllib does OK, though.

- Shailen

On May 1, 9:29?am, Stefan Behnel <stefan... at behnel.de> wrote:
> robean wrote:
> > I am writing a program that involves visiting several hundred webpages
> > and extracting specific information from the contents. I've written a
> > modest 'test' example here that uses a multi-threaded approach to
> > reach the urls with urllib2. The actual program will involve fairly
> > elaborate scraping and parsing (I'm using Beautiful Soup for that)
>
> Try lxml.html instead. It often parses HTML pages better than BS, can parse
> directly from HTTP/FTP URLs, frees the GIL doing so, and is generally a lot
> faster and more memory friendly than the combination of urllib2 and BS,
> especially when threading is involved. It also supports CSS selectors for
> finding page content, so your "elaborate scraping" might actually turn out
> to be a lot simpler than you think.
>
> http://codespeak.net/lxml/
>
> These might be worth reading:
>
> http://blog.ianbicking.org/2008/12/10/lxml-an-underappreciated-web-sc...http://blog.ianbicking.org/2008/03/30/python-html-parser-performance/
>
> Stefan



From debatem1 at gmail.com  Fri May  1 14:28:06 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 1 May 2009 11:28:06 -0700 (PDT)
Subject: ctypes: reference of a struct member?
References: <mailman.4935.1241199602.11746.python-list@python.org>
Message-ID: <ec4de350-61e4-45e9-a790-d42e80f74926@b1g2000vbc.googlegroups.com>

ctypes.byref()



From nick at craig-wood.com  Fri May  1 14:30:05 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Fri, 01 May 2009 13:30:05 -0500
Subject: object query assigned variable name?
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
Message-ID: <slrngvmfdn.bke.nick@irishsea.home.craig-wood.com>

warpcat <warpcat at sbcglobal.net> wrote:
>  I've passed this around some other groups, and I'm being told
>  "probably not possible".  But I thought I'd try here as well :)   I
>  *did* search first, and found several similar threads, but they
>  quickly tangented into other specifics of the language that were a bit
>  over my head :)  At any rate, here's a simple example, I'd love to
>  know if as shown, is somehow possible:
> 
>  Given an object:
> 
>  class Spam(object):
>      def __init__(self):
>          # stuff....
> 
>  I'd like it to print, when instanced, something like this:
> 
> >>> s = Spam()
>  I?m assigned to s!
> 
>  But it seems prohibitively hard (based on my web and forum searches)
>  for an object to know what variable name is has been assigned to when
>  created.  Querying 'self' in __init__ returns a memory location, not
>  the variable name passed in.
> 
>  If you're wondering why I'm trying to figure this out, this is just
>  part of my continued learning of the language and pushing the bounds,
>  to see what is possible ;)
> 
>  Any thoughts?

Read up on introspection and learn how to look up through the stack
frames.

When you've mastered that look for an object matching self in all the
locals in those stack frames.

That will give some kind of answer.

I have no idea whether this will work - the keyboard of my phone is
too small to produce a proof ;-)

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From davea at ieee.org  Fri May  1 14:47:30 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 01 May 2009 14:47:30 -0400
Subject: Passing a function as an argument from within the same class?
In-Reply-To: <abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com>
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>	<39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com>
	<abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com>
Message-ID: <49FB43C2.6040801@ieee.org>

zealalot wrote:
> On May 1, 10:50 am, CTO <debat... at gmail.com> wrote:
>   
>> Make doNothing a classmethod.
>>
>> class SomeClass:
>>
>>     @classmethod
>>     def doNothing(cls):
>>         pass
>>
>>     def function1(self):
>>         print "Running function 1"
>>
>>     def function2(self, passedFunction=meClass.doNothing):
>>         print "Running passed function"
>>         passedFunction()
>>
>> someObject =omeClass()
>> someObject.function2()
>> someObject.function2(someObject.function1)
>>     
>
> It's not surprising, but I've never heard of a classmethod before.
> Basically, I read that it basically removes the need for the 'self'
> argument.  Very cool!
>
> And thanks for the quick response,
>
> - Zealalot
>
>   
As you've probably figured out by now, that also gets an error, since 
you can't refer to the SomeClass  until the definition is complete.  
Better is either the sentinel approach, or defining the function outside 
the class.  Note that since the signature must match the passed 
function, you presumably need neither a self nor a cls.  So keep it 
simple and define doNothing as a top-level function.

But it's worth expanding on the notion of a classmethod.  This type of 
function is callable with any object, or just with the class name 
itself.  But it doesn't have an access to instance attributes.  That's 
good, but not very common.  Class attributes are more common, and 
they're attributes which are shared among all the objects of the class.




From mabdelkader at gmail.com  Fri May  1 14:57:03 2009
From: mabdelkader at gmail.com (ma)
Date: Fri, 1 May 2009 14:57:03 -0400
Subject: ctypes: reference of a struct member?
In-Reply-To: <ec4de350-61e4-45e9-a790-d42e80f74926@b1g2000vbc.googlegroups.com>
References: <mailman.4935.1241199602.11746.python-list@python.org> 
	<ec4de350-61e4-45e9-a790-d42e80f74926@b1g2000vbc.googlegroups.com>
Message-ID: <148918f0905011157p19f49d8aha4afda704ab2824b@mail.gmail.com>

ctypes.byref() does not work for struct members.
Try it out.
class s(ctypes.Structure):
    _fields_ = [('x',ctypes.c_int)]

a = s()
ctypes.byref(a.x) //this won't work.



On Fri, May 1, 2009 at 2:28 PM, CTO <debatem1 at gmail.com> wrote:
> ctypes.byref()
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From Scott.Daniels at Acm.Org  Fri May  1 15:03:39 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 01 May 2009 12:03:39 -0700
Subject: list comprehension question
In-Reply-To: <mailman.4930.1241197210.11746.python-list@python.org>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>	<49FB2225.4030601@councilforeconed.org>
	<mailman.4930.1241197210.11746.python-list@python.org>
Message-ID: <0_qdnYwTacv122bUnZ2dnUVZ_rqdnZ2d@pdx.net>

John Posner wrote:
> Shane Geiger wrote:
>>    if type(el) == list or type(el) is tuple:
> A tiny improvement:
> 
>        if type(el) in (list, tuple):

or (even better)
     if isinstance(el, (list, tuple))

However, it is my contention that you shouldn't be flattening by type --
you should know where, explicitly to flatten.  If I have 3-D points as
triples, a tree of points would, by this code, get flattened into a
a list of numbers.   If, however, I create a class with the same
elements, but a method or two, suddenly flatten will produce a list
of points.  It is my contention that the tree abstraction should be
responsible for producing its leaves, rather than a blunderbus that
doesn't know where one container abstraction ends, and its contents
begin.  In other words, I'd like to see thigs like "flatten one layer."

--Scott David Daniels
Scott.Daniels at Acm.Org


From norseman at hughes.net  Fri May  1 15:04:48 2009
From: norseman at hughes.net (norseman)
Date: Fri, 01 May 2009 12:04:48 -0700
Subject: don't understand namespaces...
In-Reply-To: <f355917c-3c51-4903-a529-52aa8c53dd2f@u9g2000pre.googlegroups.com>
References: <mailman.4846.1241100718.11746.python-list@python.org>
	<f355917c-3c51-4903-a529-52aa8c53dd2f@u9g2000pre.googlegroups.com>
Message-ID: <49FB47D0.4040600@hughes.net>

Simon Forman wrote:
> On Apr 30, 10:11 am, Lawrence Hanser <lhan... at gmail.com> wrote:
>> Dear Pythoners,
>>
>> I think I do not yet have a good understanding of namespaces.  Here is
>> what I have in broad outline form:
>>
>> ------------------------------------
>> import Tkinter
>>
>> Class App(Frame)
>>       define two frames, buttons in one and Listbox in the other
>>
>> Class App2(Frame)
>>       define one frame with a Text widget in it
>>
>> root = Tk()
>> app = App(root)
>> win2 = Toplevel(root)
>> app2 = App2(win2)
>> root.mainloop()
>> ------------------------------------
>>
>> My understanding of the above goes like this:
>> 1) create a root window
>> 2) instantiate a class that defines a Frame in the root window
>> 3) create another Toplevel window
>> 4) instantiate another class that defines a frame in the Toplevel window (win2)
>>
>> What I cannot figure out is how to reference a widget in app2 from app...
>>
>> I hope this is sort of clear.
>>
>> Any assistance appreciated.
>>
>> Thanks,
>>
>> Larry
> 
...(snip) # you already have Simon's approach and I'm just shorting the 
overall reply.

---------------------------------

IF you think each widget is supposed to be a program,
  I would have to say NO!

Each widget is just a pretty interface to the human.

build your program!
use the GUI to communicate with the human IN LIEU OF A COMMAND LINE. !!
That is all the GUI is for.!!!!(teacher stomping foot, shaking finger :)

instead of print()  do  msgbox()
instead of getch()  do  textbox()
instead of (command line thingy) do (GUI thingy)

and so on.
Your program is a program.
It just communicates differently.
Remember: Designing for the clicker is designing for the brain dead. :)
           (True - not in all cases, but mostly)

import Tkinter
help(Tkinter)
   (read!)

in short

import Tkinter               # load lib

root= Tk                     # use template, go live

main= Frame(root,...         # the mockup board
frame1= Frame(main,...       # frame1 will be found inside main
frame2= Frame(main,....      # frame2 will be found inside main
button1= Button(frame1,...   # button1 will be found inside frame1
frame3= Frame(root,...       # frame3 will float about on its own
msgbox1= MsgBox(where,...    # and so it goes
.
.
root.mainloop()              # run it

Those widgets with a callback= allowed can send their answers to a 
function that has has been defined previously *above* in the code.

MyYNVal= StrVal()             # here they are before example below
MyYNVal.set("*")              # to be used with above example they
                               #
                               #
def somehandler():            # need to be in same order and
   a_global= MyYNVal.get()     # before the root= line
   root.quit()                 #



rbframe= Frame(Tk,...
rb1= Radiobutton(rbframe,....., variable=MyYNVal, value= "N", 
command=somehandler, ... )
rb2= Radiobutton(rbframe,....., variable=MyYNVal, value= "Y", 
command=somehandler, ... )



program calls GUI    # how?  encapsulate widgets in a   def name()
                      # name()
human pushes button of choice which sets MyYNVal and calls somehandler
                                                 which returns to program
human_said= a_global
if human_said == "Y":
   program process accordingly
else:
   program process accordingly
.
.

Does that help?

And Yes - you can pre-edit/validate the GUI entries while still in the 
GUI. It gets a bit complicated because anything Tkinter is to use is 
already defined by time of use.  Read that sentence again.
(One pass interpreter. The pre-scan is for syntax only. It does not
   build address or set variables until actual run.
)


Today: 20090430
snippets are generalized for concept

HTH
Steve


From mabdelkader at gmail.com  Fri May  1 15:08:43 2009
From: mabdelkader at gmail.com (ma)
Date: Fri, 1 May 2009 15:08:43 -0400
Subject: fcntl and siginfo_t in python
In-Reply-To: <148918f0904301637t5e63537atd85e2a475f4e069f@mail.gmail.com>
References: <148918f0904281356v534680dcmd03084fe255cb2d3@mail.gmail.com> 
	<op.us4mtvitx6zn5v@lepton.softlabbsas.com.ar>
	<148918f0904291012j4c1ada35jcee6030b75b952d0@mail.gmail.com> 
	<loom.20090430T233215-925@post.gmane.org>
	<148918f0904301637t5e63537atd85e2a475f4e069f@mail.gmail.com>
Message-ID: <148918f0905011208u4946c377uce7603bb2e456370@mail.gmail.com>

According to man signal,
"The default action for an unhandled real-time signal is to terminate
the receiving process."

This means that my registered callback and sigaction does not work. I
think the only solution would be to try this with a C-extension. Has
anyone had any experience with this before?

I attached my latest copy. Any insight is appreciated.

On Thu, Apr 30, 2009 at 7:37 PM, ma <mabdelkader at gmail.com> wrote:
> I attached a clean copy of the .py file in case others couldn't read
> it in their emails.
> I'll try that and let you know how?SIGRTMIN+1 goes!
> What about this part?
>
> #sigemptyset(&act.sa_mask);
> #python2.6 has byref(act, offset),how can i port this over?
> #maybe addressof(act)+sizeof(sigaction.sa_mask)*(position_in_sigaction)
> rc = __clib.sigemptyset(byref(act))
>
> Thanks!
> Mahmoud
>
>
>
> On Thu, Apr 30, 2009 at 7:33 PM, Philip <philip at subaru.naoj.org> wrote:
>>
>> ma <mabdelkader <at> gmail.com> writes:
>>
>> >
>> >
>> >
>> >
>> > Here's something that I came up with so far, I'm having some issues with
>> segfaulting, if I want to pass a struct member by ref in ctypes(see below), if
>> not, I just get a
>> > "Real-time signal 0" sent back to me.
>> >
>> >
>> > Any ideas?
>>
>> Try "SIGRTMIN+1", per http://souptonuts.sourceforge.net/code/dnotify.c.html
>>
>> Philip
>>
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>
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From mail at timgolden.me.uk  Fri May  1 15:13:13 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 01 May 2009 20:13:13 +0100
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <49FB22B5.3040507@simplistix.co.uk>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB22B5.3040507@simplistix.co.uk>
Message-ID: <49FB49C9.9060901@timgolden.me.uk>

Chris Withers wrote:
> I'll say! I think .pth files are absolute evil and I wish they could 
> just be banned.
> 
> +1 on anything that makes them closer to going away or reduces the 
> possibility of yet another similar feature from hurting the 
> comprehensibility of a python setup.

I've seen this view expressed by you (and others) a number
of times, but I use them myself in my admittedly simple
circumstances without any problem. Would you mind sharing
what's so bad about them?

TJG



From Scott.Daniels at Acm.Org  Fri May  1 15:13:58 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 01 May 2009 12:13:58 -0700
Subject: Passing a function as an argument from within the same class?
In-Reply-To: <020b2035$0$20667$c3e8da3@news.astraweb.com>
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
	<020b2035$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <reGdnRRame9P1WbUnZ2dnUVZ_qOdnZ2d@pdx.net>

Steven D'Aprano wrote:
> On Fri, 01 May 2009 07:35:40 -0700, zealalot wrote:
>> So, I'm trying to come up with a way to pass a method (from the same
>> class) as the default argument for another method in the same class....
> 
> My first instinct is to say "Don't do that!", but let's see if there's a 
> way to get what you want. It's actually very easy: just put the 
> definition of the passed method before the method you want to use it in, 
> then refer to it by name *without* self.
> 
> However, there is a catch: you need to manually pass in the instance, 
> instead of letting Python do it for you.
> 
> class Spam(object):
>     def ham(self):
>         return "ham"
>     def spam(self, func=ham):
>         return "spam is a tasty %s-like food product" % func(self)

But you don't quite get the behavior the OP wanted, which was to allow
(text-producing in this case) methods as the argument:

 >>> obj = Spam()
 >>> obj.spam()
  'spam is a tasty ham-like food product'
 >>> obj.spam(obj.ham)
Traceback (most recent call last):
   File "<pyshell#271>", line 1, in <module>
     obj.spam(obj.ham)
   File "<pyshell#268>", line 5, in spam
     return "spam is a tasty %s-like food product" % func(self)
TypeError: ham() takes exactly 1 argument (2 given)

Now it is tough to use obj.

--Scott David Daniels
Scott.Daniels at Acm.Org


From davea at ieee.org  Fri May  1 15:45:30 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 01 May 2009 15:45:30 -0400
Subject: wxPython having trouble with frame objects
In-Reply-To: <f6a09c160905011014y47cd3158x2a40f8f38cf2b944@mail.gmail.com>
References: <mailman.4886.1241142872.11746.python-list@python.org>	
	<5ddd5a7f-8c2b-4f39-a89e-376a3d646caf@t36g2000prt.googlegroups.com>	
	<f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com>	
	<49FA8024.3060608@ieee.org>	
	<f6a09c160904302212p7b9bb797m4e6942c2de12e10a@mail.gmail.com>	
	<49FAFBCF.2010105@dejaviewphoto.com>
	<f6a09c160905011014y47cd3158x2a40f8f38cf2b944@mail.gmail.com>
Message-ID: <49FB515A.7070302@ieee.org>

Soumen banerjee wrote:
> Hello,
> The code works almost perfectly. I was able to correct some small
> things, and get it to work brilliantly. I would like to thank you for
> your dedicated help. My understanding of the matter here has improved
> by a lot due to your kind help. I will further work on your
> suggestions. By the way why should the general rule in 5 apply with
> respect to private and global variables?
> Regards
> Soumen
>
> On Fri, May 1, 2009 at 7:10 PM, Dave Angel <davea at dejaviewphoto.com> wrote:
>   
>> Soumen banerjee wrote:
>>     
> <snip>
You accidentally top-posted, so your response is at the beginning, 
rather than in sequence. You also forgot to CC the PythonList, so nobody 
else will see it.

One typo I thought of after hitting "send" was I omitted the 'self' 
parameter when calling the parent __init__() methods.

function variables are preferred over globals for several reasons.  One 
is that there's less likelihood of accidentally getting the wrong 
value.  If two different functions use the same name for something, 
there's no confusion unless one of them decides to make it global.  This 
is referred to as namespace pollution.  Generally, the fewer names that 
are visible at any moment, the better.  Much better to get an error than 
use the worng one.  Other namespace cases is my preference of simple 
import over   from xxx import yyy.  It means that a reference to 
something from the import takes more typing, but is clearer to the reader.

Second problem with globals is that if you write a successful program to 
do something once, it very well might not work if you just repeat it,  
because you might forget to re-initialize the globals.  If this were the 
only problem, I might solve it by making a "init_globals()" function 
that uses the global keyword to export the names it's initializing.  
Then make sure you run init_globals() before running main().  
Unfortunately, there are more problems, so forget this "solution."

Third problem with globals is involved in refactoring.  When you first 
write a glob of code, you tend to put lots in one module.  Then when you 
better understand it, you refactor it into separate modules.  If it was 
coded with globals, this refactoring is much more painful.

Fourth problem with globals is in multithreading.  Any reference to 
mutable shared information has to be considered carefully, and each 
global is a potential hazard.

So, are there uses for globals?  Certainly.   First use, simple utility 
programs that fit in one file, run non-interactively, and for whom 
development pretty much stops when they "work."  Second, any immutable 
variable, whether or not it's literally protected.  There are many of 
these already in the system.  For example, all your function names are 
global variables.  Third, the system already defines some, such as in 
the sys module.  Some of these are constant, such as the path 
separator.  Others are changeable, but not usually while the application 
is running, like sys.path.

If you have to define new ones, either put them in a separate module (as 
sys does), or put them in a single class, as instance attributes.  Then, 
when refactoring, at least you only have one thing that's got to 
beshared between modules.  Any any code that refers to them will be 
using the same name for them.




From MrJean1 at gmail.com  Fri May  1 15:50:55 2009
From: MrJean1 at gmail.com (Jean)
Date: Fri, 1 May 2009 12:50:55 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<mailman.4898.1241167327.11746.python-list@python.org>
	<7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
	<mailman.4921.1241190260.11746.python-list@python.org>
	<ff9a9718-73a5-45f9-8c29-512cd344ac8b@r37g2000yqn.googlegroups.com>
Message-ID: <b51e6b3a-3219-4b56-9b36-6494c059c761@y10g2000prc.googlegroups.com>

On May 1, 10:56?am, CTO <debat... at gmail.com> wrote:
> > sys.getsizeof() [a suggested solution] isn't platform-specific.
>
> So, to answer the OP's question, you'd just do something like
>
> def get_totalsize(obj):
> ? ? ? ? total_size = sys.getsizeof(obj)
> ? ? ? ? for value in vars(obj).values():
> ? ? ? ? ? ? ? ? try: total_size += get_total_size(value)
> ? ? ? ? ? ? ? ? except: total_size += sys.getsizeof(value)
> ? ? ? ? return totalSize
>
> def get_current_size(env):
> ? ? ? ? size = 0
> ? ? ? ? for value in env.values():
> ? ? ? ? ? ? ? ? try: size += get_total_size(value)
> ? ? ? ? ? ? ? ? except: pass
> ? ? ? ? return size
>
> get_current_size(vars())
>
> and discount the weight of the interpreter?

Keep in mind, sys.getsizeof(obj) returns only the size of the given
object.  Any referenced objects are not included.  You can get the
latter from gc.get_referents(obj).

/Jean Brouwers

PS) The asizeof(obj) function from this recipe <http://
code.activestate.com/recipes/546530> does size the object plus its
references, recursively.



From cdalten at gmail.com  Fri May  1 16:02:59 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Fri, 1 May 2009 13:02:59 -0700 (PDT)
Subject: Question about the wording in the python documents.
Message-ID: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>

At the following url...

http://docs.python.org/library/urllib2.html

They have the following...

"urllib2.urlopen(url[, data][, timeout])

    Open the URL url, which can be either a string or a Request
object"

I don't get how urllib2.urlopen() can take a Request object. When I do
the following....

[cdalten at localhost ~]$ python
Python 2.4.3 (#1, Oct  1 2006, 18:00:19)
[GCC 4.1.1 20060928 (Red Hat 4.1.1-28)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import urllib2
>>>
>>> url = 'http://www.google.com'
>>> req = urllib2.Request(url)
>>> response = urllib2.urlopen(req)
>>>

req is clearly an instance of urllib2.Request and not a Request object.


From lenglish5 at cox.net  Fri May  1 16:10:26 2009
From: lenglish5 at cox.net (Lawson English)
Date: Fri, 01 May 2009 13:10:26 -0700
Subject: [ANN] Python testing client for Second Life virtual world
In-Reply-To: <20090428122837.24697.1129485049.divmod.quotient.12755@henry.divmod.com>
References: <20090428122837.24697.1129485049.divmod.quotient.12755@henry.divmod.com>
Message-ID: <49FB5732.8030807@cox.net>

If anyone is curious, I'm working on a GUI shell for the python second 
life client, pyogp.

Temp home for pyogp intro: 
https://wiki.secondlife.com/wiki/Pyogp/Client_Lib
Basically the [first] plan is to have a GUI wrapper around the sample 
code with a batch file option, and to allow multiple avatar execution 
and control in the same process. It's been tested in the command line 
with up to 20 avatars at once, and the goal is to handle 200 at least, 
for QA purposes, so the GUI has to handle that as well.

Its a pretty interesting project, IMHO. Gives complete source for 
non-graphical aspects of interface with the Second Life virtual world. 
Apache V2 licensed.


Lawson


From rpmuller at gmail.com  Fri May  1 16:54:02 2009
From: rpmuller at gmail.com (Rick Muller)
Date: Fri, 1 May 2009 13:54:02 -0700 (PDT)
Subject: Profiling gives very different predictions of best algorithm
Message-ID: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>

I'm the main programmer for the PyQuante package, a quantum chemistry
package in Python. I'm trying to speed up one of my rate determining
steps. Essentially, I have to decide between two algorithms:

1. Packed means that I compute N**4/8 integrals, and then do a bunch
of indexing operations to unpack;
2. Unpacked means that I compute all N**4 integrals, but don't have to
do any indexing.

Raw timing the two options show that packed is clearly faster (12.5
sec vs 20.6 sec). However, the profilings show very different results.
I have the results below. Clearly I'm going to use the packed scheme.
My question to the mailing list is what am I doing wrong with my
profiling that it shows such poor predictions? I rely on profiling a
great deal to tune my algorithms, and I'm used to seeing differences,
but nothing close to this magnitude.

Here is packed:
 ncalls  tottime  percall  cumtime  percall filename:lineno(function)
 11021725   84.493    0.000   84.493    0.000 :0(ijkl2intindex)
       18   62.064    3.448  119.865    6.659 Ints.py:150(getK)
       18   32.063    1.781   61.186    3.399 Ints.py:131(getJ)
    52975    9.404    0.000   19.658    0.000 CGBF.py:189(coulomb)
   313643    2.542    0.000    2.542    0.000 :0(range)
    52975    2.260    0.000    2.260    0.000 :0(contr_coulomb)
   218200    1.377    0.000    1.377    0.000 CGBF.py:51(norm)
   211900    1.337    0.000    1.337    0.000 CGBF.py:53(powers)
   211900    1.336    0.000    1.336    0.000 CGBF.py:56(exps)
   211900    1.329    0.000    1.329    0.000 CGBF.py:58(pnorms)
   211900    1.328    0.000    1.328    0.000 CGBF.py:52(origin)
   211900    1.328    0.000    1.328    0.000 CGBF.py:57(coefs)
        1    0.979    0.979   21.108   21.108 Ints.py:112(get2ints)
    11790    0.197    0.000    0.197    0.000 :0(dot)
    11828    0.166    0.000    0.166    0.000 :0(zeros)

Here is unpacked:
ncalls  tottime  percall  cumtime  percall filename:lineno(function)
       18   16.158    0.898   17.544    0.975 Ints.py:167(getK)
    52975    9.301    0.000   19.515    0.000 CGBF.py:189(coulomb)
       18    4.584    0.255    5.904    0.328 Ints.py:146(getJ)
   313643    2.630    0.000    2.630    0.000 :0(range)
    52975    2.254    0.000    2.254    0.000 :0(contr_coulomb)
   218200    1.375    0.000    1.375    0.000 CGBF.py:51(norm)
   211900    1.330    0.000    1.330    0.000 CGBF.py:58(pnorms)
   211900    1.325    0.000    1.325    0.000 CGBF.py:53(powers)
   211900    1.325    0.000    1.325    0.000 CGBF.py:57(coefs)
   211900    1.323    0.000    1.323    0.000 CGBF.py:56(exps)
   211900    1.321    0.000    1.321    0.000 CGBF.py:52(origin)
        1    0.782    0.782   20.373   20.373 Ints.py:114(get2ints)
     1875    0.156    0.000    0.384    0.000 CGBF.py:106(nuclear)
    11790    0.147    0.000    0.147    0.000 :0(dot)
    17856    0.112    0.000    0.112    0.000 PGBF.py:63(coef)


From Brian.Mingus at colorado.edu  Fri May  1 16:57:27 2009
From: Brian.Mingus at colorado.edu (Brian)
Date: Fri, 1 May 2009 14:57:27 -0600
Subject: Profiling gives very different predictions of best algorithm
In-Reply-To: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
References: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
Message-ID: <9839a05c0905011357h3b604bf3k12e630e76717df34@mail.gmail.com>

quantum chemistry sounds complicated. that means any advice i can give you
makes me a genius! just kidding. i've heard through the grapevine that
reentrant functions mess up profilers.

On Fri, May 1, 2009 at 2:54 PM, Rick Muller <rpmuller at gmail.com> wrote:

> I'm the main programmer for the PyQuante package, a quantum chemistry
> package in Python. I'm trying to speed up one of my rate determining
> steps. Essentially, I have to decide between two algorithms:
>
> 1. Packed means that I compute N**4/8 integrals, and then do a bunch
> of indexing operations to unpack;
> 2. Unpacked means that I compute all N**4 integrals, but don't have to
> do any indexing.
>
> Raw timing the two options show that packed is clearly faster (12.5
> sec vs 20.6 sec). However, the profilings show very different results.
> I have the results below. Clearly I'm going to use the packed scheme.
> My question to the mailing list is what am I doing wrong with my
> profiling that it shows such poor predictions? I rely on profiling a
> great deal to tune my algorithms, and I'm used to seeing differences,
> but nothing close to this magnitude.
>
> Here is packed:
>  ncalls  tottime  percall  cumtime  percall filename:lineno(function)
>  11021725   84.493    0.000   84.493    0.000 :0(ijkl2intindex)
>       18   62.064    3.448  119.865    6.659 Ints.py:150(getK)
>       18   32.063    1.781   61.186    3.399 Ints.py:131(getJ)
>    52975    9.404    0.000   19.658    0.000 CGBF.py:189(coulomb)
>   313643    2.542    0.000    2.542    0.000 :0(range)
>    52975    2.260    0.000    2.260    0.000 :0(contr_coulomb)
>   218200    1.377    0.000    1.377    0.000 CGBF.py:51(norm)
>   211900    1.337    0.000    1.337    0.000 CGBF.py:53(powers)
>   211900    1.336    0.000    1.336    0.000 CGBF.py:56(exps)
>   211900    1.329    0.000    1.329    0.000 CGBF.py:58(pnorms)
>   211900    1.328    0.000    1.328    0.000 CGBF.py:52(origin)
>   211900    1.328    0.000    1.328    0.000 CGBF.py:57(coefs)
>        1    0.979    0.979   21.108   21.108 Ints.py:112(get2ints)
>    11790    0.197    0.000    0.197    0.000 :0(dot)
>    11828    0.166    0.000    0.166    0.000 :0(zeros)
>
> Here is unpacked:
> ncalls  tottime  percall  cumtime  percall filename:lineno(function)
>       18   16.158    0.898   17.544    0.975 Ints.py:167(getK)
>    52975    9.301    0.000   19.515    0.000 CGBF.py:189(coulomb)
>       18    4.584    0.255    5.904    0.328 Ints.py:146(getJ)
>   313643    2.630    0.000    2.630    0.000 :0(range)
>    52975    2.254    0.000    2.254    0.000 :0(contr_coulomb)
>   218200    1.375    0.000    1.375    0.000 CGBF.py:51(norm)
>   211900    1.330    0.000    1.330    0.000 CGBF.py:58(pnorms)
>   211900    1.325    0.000    1.325    0.000 CGBF.py:53(powers)
>   211900    1.325    0.000    1.325    0.000 CGBF.py:57(coefs)
>   211900    1.323    0.000    1.323    0.000 CGBF.py:56(exps)
>   211900    1.321    0.000    1.321    0.000 CGBF.py:52(origin)
>        1    0.782    0.782   20.373   20.373 Ints.py:114(get2ints)
>     1875    0.156    0.000    0.384    0.000 CGBF.py:106(nuclear)
>    11790    0.147    0.000    0.147    0.000 :0(dot)
>    17856    0.112    0.000    0.112    0.000 PGBF.py:63(coef)
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From emile at fenx.com  Fri May  1 17:06:23 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 01 May 2009 14:06:23 -0700
Subject: Question about the wording in the python documents.
In-Reply-To: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
References: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
Message-ID: <gtfo5j$u7c$1@ger.gmane.org>

On 5/1/2009 1:02 PM grocery_stocker said...
> At the following url...
> 
> http://docs.python.org/library/urllib2.html
> 
> They have the following...
> 
> "urllib2.urlopen(url[, data][, timeout])
> 
>     Open the URL url, which can be either a string or a Request
> object"
> 
> I don't get how urllib2.urlopen() can take a Request object. When I do
> the following....
> 
> [cdalten at localhost ~]$ python
> Python 2.4.3 (#1, Oct  1 2006, 18:00:19)
> [GCC 4.1.1 20060928 (Red Hat 4.1.1-28)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import urllib2
>>>>
>>>> url = 'http://www.google.com'
>>>> req = urllib2.Request(url)
>>>> response = urllib2.urlopen(req)
>>>>
> 
> req is clearly an instance of urllib2.Request and not a Request object.

Yes -- it seems both the 'Request Object' and 'Request Instance' terms 
are used.

If you feel it's a bug you can report this at http://bugs.python.org, 
but I'm not sure what else an object would be if not an instance of a 
class...

Emile
-----

 >>> help (urllib2)
Help on module urllib2:

NAME
     urllib2 - An extensible library for opening URLs
     using a variety of protocols

FILE
     c:\python24\lib\urllib2.py

DESCRIPTION
     The simplest way to use this module is to call the
     urlopen function, which accepts a string containing
     a URL or a Request object (described below).
---------------^^^^^^^^^^^^^^

<snip 2 paragraphs>

     urlopen(url, data=None) -- basic usage is that same
     as original urllib.  pass the url and optionally data
     to post to an HTTP URL, and get a file-like object
     back.  One difference is that you can also pass a
     Request instance instead of URL.
----^^^^^^^^^^^^^^^^




From castironpi at gmail.com  Fri May  1 17:18:05 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 1 May 2009 14:18:05 -0700 (PDT)
Subject: subprocess & shared environments
References: <8c79f749-e648-4a2e-afad-4053a8ec5cbd@f41g2000pra.googlegroups.com>
Message-ID: <98aa4906-5006-437a-8fc0-0eaedf433be9@3g2000yqk.googlegroups.com>

On May 1, 12:09?am, Robert Dailey <rcdai... at gmail.com> wrote:
> I'm currently calling subprocess.call() on a batch file (in Windows)
> that sets a few environment variables that are needed by further
> processes started via subprocess.call(). How can I persist the
> environment modifications by the first call() function? I've done my
> own searching on this and I came up with nothing.
>
> Help is appreciated.

I don't know if this will work, but you can try spawning a batch file
that calls the first program to set the variables, then executes the
second program.  You might need to create that batch file by hand, as
well as the command line for the second process.

You can also try setting the env. variables in the parent process, and
restoring them after.


From kyosohma at gmail.com  Fri May  1 17:21:26 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 1 May 2009 14:21:26 -0700 (PDT)
Subject: wxPython having trouble with frame objects
References: <mailman.4886.1241142872.11746.python-list@python.org> 
	<5ddd5a7f-8c2b-4f39-a89e-376a3d646caf@t36g2000prt.googlegroups.com> 
	<f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com> 
	<49FA8024.3060608@ieee.org>
	<mailman.4893.1241154771.11746.python-list@python.org>
Message-ID: <7a695810-56b6-428e-98cb-2205407eb5c6@g19g2000yql.googlegroups.com>

On May 1, 12:12?am, Soumen banerjee <soume... at gmail.com> wrote:
> Hello,
> Im not adding any GUI elements from the changer thread. Im just
> attempting to change the value of a preexisting widget made in thread
> one. The point is that i need to display text generated in thread 2 in
> a GUI generated in thread 1.
> As far as inter thread synchronization is concerned, i see your point.
> So i took this approach
>
> import wx,gui,threading
> fix=0
> i=1
> class guithread(threading.Thread):
> ? ? def run(self):
> ? ? ? ? global fix
> ? ? ? ? app = wx.PySimpleApp(0)
> ? ? ? ? wx.InitAllImageHandlers()
> ? ? ? ? guithread.frame_1 = gui.MyFrame(None, -1, "")
> ? ? ? ? app.SetTopWindow(guithread.frame_1)
> ? ? ? ? guithread.frame_1.Show()
> ? ? ? ? print "setting fix"
> ? ? ? ? fix=1
> ? ? ? ? app.MainLoop()
> gui1=guithread()
> gui1.start()
> class changer(threading.Thread):
> ? ? def run(self):
> ? ? ? ? print fix
> ? ? ? ? gui1.frame_1.text_ctrl_1.SetValue("hello")
> print fix
> while i:
> ? ? if fix == 1:
> ? ? ? ? print "starting changer"
> ? ? ? ? chang=changer()
> ? ? ? ? chang.start()
> ? ? ? ? i=0
> This works, but is there anything simpler?
> Regards
> Soumen

For additional ideas on using threads in wxPython, see the wiki:

http://wiki.wxpython.org/LongRunningTasks

- Mike


From darwin at nowhere.com  Fri May  1 17:23:58 2009
From: darwin at nowhere.com (Paul Hemans)
Date: Sat, 2 May 2009 07:23:58 +1000
Subject: What do you think of ShowMeDo
References: <b6671f88-bc04-42eb-aad1-5b212bcab1ef@z23g2000prd.googlegroups.com>
	<87tz48s7hm.fsf@benfinney.id.au>
	<52d28fba-ebf7-4bfb-b568-64304da650d5@w31g2000prd.googlegroups.com>
	<pan.2009.04.29.06.27.10@REMOVE.THIS.cybersource.com.au>
	<17bacf12-037f-4dda-8ee3-1b51d83ac654@z23g2000prd.googlegroups.com>
	<gtd6l3$1ph4$1@news.ett.com.ua>
	<760gejF1af7reU1@mid.individual.net>
Message-ID: <gtfp9l$irp$1@news.ett.com.ua>

I was fishing for a response, by posting multiple replies
Inadvertantly, I have offended one of the Python rabbis
For this misdemeanor I am most contrite
But I still got a fish to bite.

"Peter Pearson" <ppearson at nowhere.invalid> wrote in message 
news:760gejF1af7reU1 at mid.individual.net...
> On Fri, 1 May 2009 07:53:35 +1000, Paul Hemans <darwin at nowhere.com> wrote:
> [snip]
>> them as they have been recorded in the anals of the web, however I
> .........................................^^^^^
>
> That's the second time in this thread.  The first might have been
> deliberate gross wordplay, but now it's time for somebody to point
> out that maybe this word doesn't mean what you think it means.
>
> -- 
> To email me, substitute nowhere->spamcop, invalid->net. 




From kyosohma at gmail.com  Fri May  1 17:24:41 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 1 May 2009 14:24:41 -0700 (PDT)
Subject: wxPython having trouble with frame objects
References: <mailman.4886.1241142872.11746.python-list@python.org> 
	<5ddd5a7f-8c2b-4f39-a89e-376a3d646caf@t36g2000prt.googlegroups.com> 
	<f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com> 
	<mailman.4892.1241153586.11746.python-list@python.org>
Message-ID: <38f911cf-654e-4b7e-ba73-2cb63f18c424@q16g2000yqg.googlegroups.com>

On Apr 30, 11:52?pm, Dave Angel <da... at ieee.org> wrote:
> Soumen banerjee wrote:
> > Hello,
> > you say that ?frame_1 is an attribute of the main class. The main
> > class here is guithread right? so any instance of guithread should
> > also have an attribute called frame_1 isnt it? Excuse me if im getting
> > this wrong, since i am somewhat new to python.
> > Regards
> > Soumen
>
> > On Fri, May 1, 2009 at 9:05 AM, CM <cmpyt... at gmail.com> wrote:
>
> >> On Apr 30, 9:54 pm, Soumen banerjee <soume... at gmail.com> wrote:
>
> >>> Hello,
> >>> I am using wxglade to design a gui which i am using in another script.
> >>> Here are the codes
>
> >>> The main file:
> >>> import wx,gui,threading
> >>> class guithread(threading.Thread):
> >>> ? ?def run(self):
> >>> ? ? ? ?app =x.PySimpleApp(0)
> >>> ? ? ? ?wx.InitAllImageHandlers()
> >>> ? ? ? ?self.frame_1 =ui.MyFrame(None, -1, "")
> >>> ? ? ? ?app.SetTopWindow(self.frame_1)
> >>> ? ? ? ?self.frame_1.Show()
> >>> ? ? ? ?app.MainLoop()
> >>> gui1=ithread()
> >>> gui1.start()
> >>> class changer(threading.Thread):
> >>> ? ?def run(self):
> >>> ? ? ? ?gui1.frame_1.text_ctrl_1.Setvalue("hello")
> >>> chang=anger()
> >>> chang.start()
>
> >>> and The GUI file (gui.py, imported in the above)
> >>> import wx
>
> >>> # begin wxGlade: extracode
> >>> # end wxGlade
>
> >>> class MyFrame(wx.Frame):
> >>> ? ?def __init__(self, *args, **kwds):
> >>> ? ? ? ?# begin wxGlade: MyFrame.__init__
> >>> ? ? ? ?kwds["style"] =x.DEFAULT_FRAME_STYLE
> >>> ? ? ? ?wx.Frame.__init__(self, *args, **kwds)
> >>> ? ? ? ?self.text_ctrl_1 =x.TextCtrl(self, -1, "")
> >>> ? ? ? ?self.slider_1 =x.Slider(self, -1, 0, 0, 10)
> >>> ? ? ? ?self.Open =x.Button(self, -1, "Open")
> >>> ? ? ? ?self.button_4 =x.Button(self, -1, "Pause/Resume")
> >>> ? ? ? ?self.button_5 =x.Button(self, -1, "Quit")
>
> >>> ? ? ? ?self.__set_properties()
> >>> ? ? ? ?self.__do_layout()
>
> >>> ? ? ? ?self.Bind(wx.EVT_COMMAND_SCROLL, self.slider, self.slider_1)
> >>> ? ? ? ?self.Bind(wx.EVT_BUTTON, self.open, self.Open)
> >>> ? ? ? ?self.Bind(wx.EVT_BUTTON, self.pause, self.button_4)
> >>> ? ? ? ?self.Bind(wx.EVT_BUTTON, self.quit, self.button_5)
> >>> ? ? ? ?# end wxGlade
>
> >>> ? ?def __set_properties(self):
> >>> ? ? ? ?# begin wxGlade: MyFrame.__set_properties
> >>> ? ? ? ?self.SetTitle("frame_1")
> >>> ? ? ? ?self.SetSize((522, 457))
> >>> ? ? ? ?# end wxGlade
>
> >>> ? ?def __do_layout(self):
> >>> ? ? ? ?# begin wxGlade: MyFrame.__do_layout
> >>> ? ? ? ?sizer_1 =x.BoxSizer(wx.VERTICAL)
> >>> ? ? ? ?sizer_2 =x.BoxSizer(wx.VERTICAL)
> >>> ? ? ? ?sizer_3 =x.BoxSizer(wx.HORIZONTAL)
> >>> ? ? ? ?sizer_2.Add(self.text_ctrl_1, 7, wx.EXPAND, 0)
> >>> ? ? ? ?sizer_2.Add(self.slider_1, 0, wx.EXPAND, 0)
> >>> ? ? ? ?sizer_3.Add(self.Open, 0, wx.LEFT, 70)
> >>> ? ? ? ?sizer_3.Add((52, 20), 0, 0, 0)
> >>> ? ? ? ?sizer_3.Add(self.button_4, 0, wx.ALIGN_CENTER_HORIZONTAL, 0)
> >>> ? ? ? ?sizer_3.Add((55, 23), 0, 0, 0)
> >>> ? ? ? ?sizer_3.Add(self.button_5, 0, 0, 0)
> >>> ? ? ? ?sizer_2.Add(sizer_3, 1, wx.EXPAND, 0)
> >>> ? ? ? ?sizer_1.Add(sizer_2, 1, wx.EXPAND, 0)
> >>> ? ? ? ?self.SetSizer(sizer_1)
> >>> ? ? ? ?self.Layout()
> >>> ? ? ? ?# end wxGlade
>
> >>> ? ?def slider(self, event): # wxGlade: MyFrame.<event_handler>
> >>> ? ? ? ?print "Event handler `slider' not implemented!"
> >>> ? ? ? ?event.Skip()
>
> >>> ? ?def open(self, event): # wxGlade: MyFrame.<event_handler>
> >>> ? ? ? ?print "Event handler `open' not implemented!"
> >>> ? ? ? ?event.Skip()
>
> >>> ? ?def pause(self, event): # wxGlade: MyFrame.<event_handler>
> >>> ? ? ? ?print "Event handler `pause' not implemented!"
> >>> ? ? ? ?event.Skip()
>
> >>> ? ?def quit(self, event): # wxGlade: MyFrame.<event_handler>
> >>> ? ? ? ?print "Event handler `quit' not implemented!"
> >>> ? ? ? ?event.Skip()
>
> >>> # end of class MyFrame
>
> >>> if __name__ ="__main__":
> >>> ? ?app =x.PySimpleApp(0)
> >>> ? ?wx.InitAllImageHandlers()
> >>> ? ?frame_1 =yFrame(None, -1, "")
> >>> ? ?app.SetTopWindow(frame_1)
> >>> ? ?frame_1.Show()
> >>> ? ?app.MainLoop()
>
> >>> The problem here is that when i run the main file, i am told that
> >>> 'guithread' object has no attribute 'frame_1' whereas i seem to have
> >>> defined
> >>> self.frame_1=i.MyFrame etc.
>
> >> Your statement above means that self--that is, the instance of
> >> your main class--has an attribute called frame_1, and that name
> >> refers to an instance of the MyFrame class from the gui module.
>
> >> It does not mean that the guithread object has an attribute named
> >> frame_1. ?In order to do that, you should have written:
>
> >> guithread.frame_1 =omething
>
> >>> The idea here is to access a gui element running in a thread from a
> >>> separate thread. Please help
>
> >> I would post wxPython related questions on the wxPython mailing
> >> list, which is excellent.
> >>http://www.wxpython.org/maillist.php
>
> >> HTH,
> >> Che
> >> --
> >>http://mail.python.org/mailman/listinfo/python-list
>
> Don't top-post. It puts things entirely out of order. Now the order of
> the parts of this message are 3, 1, 2, 4
>
> Two things at least are wrong here, either of which is fatal.
> ? ?1) you have two threads doing GUI stuff. ?Can't be done, at least not in wxPython. ?Certain things can be done in a second thread, but definitely not constructing Frames and such.


You are correct...but I think that's pretty common across GUI
toolkits. The GUI has it's own main loop that will get blocked if
another thread tries to do something or you'll end up with strange
behavior. As far as I know, each toolkit has its own methods for
working around this. In wxPython's case, you can use wx.CallAfter,
wx.CallLater and several others to manipulate the GUI from a thread.

There's some other ways of going about this on the wxPython wiki:
http://wiki.wxpython.org/LongRunningTasks

- Mike



From seanm.py at gmail.com  Fri May  1 17:34:03 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Fri, 1 May 2009 14:34:03 -0700 (PDT)
Subject: Help! Can't get program to run.
Message-ID: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>

I think this is maybe the most basic problem possible, but I can't get
even the most basic Python to run on OS X using Terminal or IDLE. I
used the IDLE editor to create a file with one line of code

print 'text string'

and I saved the file as module1.py. When using terminal I entered
"python" to load the interpreter or whatever and then tried

python module1.py

but I got an error message. I've tried using the file path instead of
module1.py and that didn't work either. I've tried moving the file to
different places, my desktop, hard drive, etc., and none of that
worked either. In IDLE I tried similar things and only got error
messages there too.

Needless to say this is a frustrating start to learning this langauge.
I'd really appreciate any help getting this to work, so I can move on
the actual language. Thanks so much.


From tjreedy at udel.edu  Fri May  1 17:37:48 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 01 May 2009 17:37:48 -0400
Subject: Passing a function as an argument from within the same class?
In-Reply-To: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
Message-ID: <gtfq3c$46q$1@ger.gmane.org>

zealalot wrote:
> So, I'm trying to come up with a way to pass a method (from the same
> class) as the default argument for another method in the same class.
> Unfortunately though, I keep getting "self not defined" errors since
> the class hasn't been read completely before it references itself.
> 
> Is there a better way of doing this?
> 
> --- CODE ---
> 
> class SomeClass():
>     def doNothing(self):
>         pass
>     def function1(self):
>         print "Running function 1."
>     def function2(self, passedFunction=self.doNothing):
>         print "Running passed function."
>         passedFunction()
> 
> someObject = SomeClass()
> someObject.function2(someobject.function1)

As Stephen D'Aprano indicated, this is very easy

class SomeClass():
     def doNothing(self):
         print("Doing nothing")
     def function1(self):
         print ("Running function 1.")
     def function2(self, passedFunction=doNothing):
         print ("Running passed function.")
         passedFunction(self)

someObject = SomeClass()
someObject.function2()
someObject.function2(SomeClass.function1)

produces (with 3.0.1)

Running passed function.
Doing nothing
Running passed function.
Running function 1.

Key 1: a class statement introduces a new local namespace.  The body of 
the class statement is executed in that namespace.  Default arguments 
are evaluated, when a def statement is executed, in the local namespace 
of that def statement.  For methods, that is the local namespace of the 
class.  Hence, 'passedFunction = doNothing' works fine.

Key 2: When a parameter is a function, the signature of the default and 
passed args are effectively part of the required type for the args.  In 
this case, passedFunction is a function with one parameter.  When 
captured, doNothing is not yet a method of the yet-to-become Someclass. 
So non-defaults passed to .function2 do not have to be methods either. 
In Python 3, unbound methods are simply functions anyway.

Terry Jan Reedy



From tjreedy at udel.edu  Fri May  1 17:42:47 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 01 May 2009 17:42:47 -0400
Subject: Importing modules
In-Reply-To: <49FB2F13.4040906@hughes.net>
References: <b6671f88-bc04-42eb-aad1-5b212bcab1ef@z23g2000prd.googlegroups.com>	<87tz48s7hm.fsf@benfinney.id.au>	<52d28fba-ebf7-4bfb-b568-64304da650d5@w31g2000prd.googlegroups.com>	<pan.2009.04.29.06.27.10@REMOVE.THIS.cybersource.com.au>	<17bacf12-037f-4dda-8ee3-1b51d83ac654@z23g2000prd.googlegroups.com>	<4eb0089f0904291713m3859c90yd0298a740967b149@mail.gmail.com>	<b1d973a70904291801q39854313ic4ca35863580a52a@mail.gmail.com>	<mailman.4818.1241065035.11746.python-list@python.org>	<a4d6108f-13d5-4adb-8bcc-c9772ea3af1f@d19g2000prh.googlegroups.com>	<49f9e0f8$0$7893$9a6e19ea@unlimited.newshosting.com>	<op.us77a7bsx6zn5v@lepton.softlabbsas.com.ar>
	<49FB2F13.4040906@hughes.net>
Message-ID: <gtfqcn$4uc$1@ger.gmane.org>

norseman wrote:

> OH - something you mentioned that didn't seem to be addressed.
> import - load a complete library
> from   - obtain specific 'function'(s) from a library

from can also be used to get a specific module from a package

If you 'import pack.mod', then you have to write 'pack.mod.ob' to access 
anything within mod.  But if you do 'from pack import mod', then just 
'mod.ob' works.



From deets at nospam.web.de  Fri May  1 17:45:23 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 01 May 2009 23:45:23 +0200
Subject: Help! Can't get program to run.
In-Reply-To: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
Message-ID: <7618rjF1a3t8jU1@mid.uni-berlin.de>

seanm.py at gmail.com schrieb:
> I think this is maybe the most basic problem possible, but I can't get
> even the most basic Python to run on OS X using Terminal or IDLE. I
> used the IDLE editor to create a file with one line of code
> 
> print 'text string'
> 
> and I saved the file as module1.py. When using terminal I entered
> "python" to load the interpreter or whatever and then tried
> 
> python module1.py
> 
> but I got an error message. I've tried using the file path instead of
> module1.py and that didn't work either. I've tried moving the file to
> different places, my desktop, hard drive, etc., and none of that
> worked either. In IDLE I tried similar things and only got error
> messages there too.
> 
> Needless to say this is a frustrating start to learning this langauge.
> I'd really appreciate any help getting this to work, so I can move on
> the actual language. Thanks so much.

It would have helped if you had given us the *actual* error-message.


 From what little information you give, it appears as if you do 
something very basic wrong - instead of doing

$ python
 >>> python mymodule.py

(where $ is the shell/terminal and >>> the python-prompt)

you either do

$ python
 >>> print "hello"

or

$ python mymodule.py

to execute mymodule directly.

Diez


From tjreedy at udel.edu  Fri May  1 17:50:00 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 01 May 2009 17:50:00 -0400
Subject: Profiling gives very different predictions of best algorithm
In-Reply-To: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
References: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
Message-ID: <gtfqq8$4uc$2@ger.gmane.org>

Rick Muller wrote:
> I'm the main programmer for the PyQuante package, a quantum chemistry
> package in Python. I'm trying to speed up one of my rate determining
> steps. Essentially, I have to decide between two algorithms:
> 
> 1. Packed means that I compute N**4/8 integrals, and then do a bunch
> of indexing operations to unpack;
> 2. Unpacked means that I compute all N**4 integrals, but don't have to
> do any indexing.
> 
> Raw timing the two options show that packed is clearly faster (12.5
> sec vs 20.6 sec). However, the profilings show very different results.
> I have the results below. Clearly I'm going to use the packed scheme.
> My question to the mailing list is what am I doing wrong with my
> profiling that it shows such poor predictions? 

That *might* be easier to answer if you were to show exactly what you 
did to get the odd-looking results ;-)



From castironpi at gmail.com  Fri May  1 17:51:04 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 1 May 2009 14:51:04 -0700 (PDT)
Subject: Multiprocessing.Queue - I want to end.
References: <mailman.4864.1241124562.11746.python-list@python.org>
Message-ID: <2759676b-952a-46d0-a766-334782794984@o18g2000yqi.googlegroups.com>

On Apr 30, 3:49?pm, Luis Zarrabeitia <ky... at uh.cu> wrote:
> Hi. I'm building a script that closely follows a producer-consumer model. In
> this case, the producer is disk-bound and the consumer is cpu-bound, so I'm
> using the multiprocessing module (python2.5 with the multiprocessing backport
> from google.code) to speed up the processing (two consumers, one per core,
> and one producer). The consumers are two multiprocessing.Process instances,
> the producer is the main script, and the data is sent using a
> multiprocessing.Queue instance (with bounded capacity).
>
> The problem: when there is no more data to process, how can I signal the
> consumers to consume until the queue is empty and then stop consuming? I need
> them to do some clean-up work after they finish (and then I need the main
> script to summarize the results)
snip
> ? ? for data in iter(queue.get, None):
> ? ? ? ? process_data(data, outfile) # stores the result in the outfile
snip
> ? ? queue.put(None); queue.put(None)
snip
> As you can see, I'm sending one 'None' per consumer, and hoping that no
> consumer will read more than one None. While this particular implementation
> ensures that, it is very fragile. Is there any way to signal the consumers?
> (or better yet, the queue itself, as it is shared by all consumers?)
> Should "close" work for this? (raise the exception when the queue is
> exhausted, not when it is closed by the producer).

You may have to write the consumer loop by hand, rather than using
'for'.  In the same-process case, you can do this.

producer:
sentinel= object( )

consumer:
while True:
  item= queue.get( )
  if item is sentinel:
    break
  etc.

Then, each consumer is guaranteed to consume no more than one
sentinel, and thus producing one sentinel per consumer will halt them
all.

However, with multiple processes, the comparison to 'sentinel' will
fail, since each subprocess gets a copy, not the original, of the
sentinel.  A sample program which sent the same object multiple times
produced this output:

<object object at 0x00B8A388>
<object object at 0x00B8A3A0>

Theoretically, you could send a shared object, which would satisfy the
identity test in the subprocess.  That failed with this exception:

  File "c:\programs\python30\lib\multiprocessing\queues.py", line 51,
in __getstate__
    assert_spawning(self)
...
RuntimeError: Queue objects should only be shared between processes th
rough inheritance

As a result, your options are more complicated.  I think the best
option is to send a tuple with the data.  Instead of sending 'item',
send '( True, item )'.  Then when the producer is finished, send
'( False, <any> )'.  The consumer will break when it encounters a
'False' first value.

An alternative is to spawn a watchman thread in each subprocess, which
merely blocks for a shared Event object, then sets a per-process
variable, then adds a dummy object to the queue.  The dummy is
guaranteed to be added after the last of the data.  Each process is
guaranteed to consume no more than one dummy, so they will all wake
up.

If you don't like those, you could just use a time-out, which checks
the contents of a shared variable, like a one-element array, then
checks the queue to be empty.  If the shared variable is True, and the
queue is empty, there is no more data.

I'm curious how these work and what you decide.


From castironpi at gmail.com  Fri May  1 18:03:30 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 1 May 2009 15:03:30 -0700 (PDT)
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz> <49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au> 
	<gtdtsr$qv1$3@lust.ihug.co.nz>
	<020ab4a3$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <dabe1eec-0848-45fb-bf85-4f7b235900b5@l12g2000yqo.googlegroups.com>

On May 1, 4:30?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Fri, 01 May 2009 16:30:19 +1200, Lawrence D'Oliveiro wrote:
> > I have never written anything so unbelievable in my life. And I hope I
> > never will.
>
> I didn't say you did. If anyone thought I was quoting Lawrence's code,
> I'd be surprised. It was not my intention to put words into your mouth.
>
> But seeing as you have replied, perhaps you could tell us something.
> Given so much you despise using non-bools in truth contexts, how would
> you re-write my example to avoid "a or b or c"?
>
> for x in a or b or c:
> ? ? do_something_with(x)

I think Hendrik's is the closest so far, but still doesn't iterate
over x:

for t in [a,b,c]:
    if t:
        for x in t:
            do_something_with(x)
        break

This is still not right, since Steven's code will raise an exception
if 'a' and 'b' test False, and 'c' is non-iterable.

>>> for x in 0 or 0 or 0:
...     print( x )
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'int' object is not iterable
>>> for x in 0 or 0 or []:
...     print( x )
...
>>> for x in 0 or 0 or 1:
...     print( x )
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'int' object is not iterable
>>> for x in ['abc'] or 0 or 0:
...     print( x )
...
abc

To mimic it exactly, you'd have to actually convert the first one,
execute 'or' on the other two, since they may have side-effects or
return other values than themselves, and try iterating over the last
one.  I think you are looking at an 'ireduce' function, which doesn't
exist in 'itertools' yet.

I don't think it would be very common to write Steven's construction
for arbitrary values of 'a', 'b', and 'c'.


From rschroev_nospam_ml at fastmail.fm  Fri May  1 18:04:45 2009
From: rschroev_nospam_ml at fastmail.fm (Roel Schroeven)
Date: Sat, 02 May 2009 00:04:45 +0200
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <mailman.4899.1241167799.11746.python-list@python.org>
References: <200904301649.10341.kyrie@uh.cu>
	<mailman.4899.1241167799.11746.python-list@python.org>
Message-ID: <2mKKl.16353$B17.1674@newsfe26.ams2>

Hendrik van Rooyen schreef:
> I have always wondered why people do the one queue many getters thing.

Because IMO it's the simplest and most elegant solution.
> 
> Given that the stuff you pass is homogenous in that it will require a
> similar amount of effort to process, is there not a case to be made
> to have as many queues as consumers, and to round robin the work?

Could work if the processing time for each work unit is exactly the same
(otherwise one or more consumers will be idle part of the time), but in
most cases that is not guaranteed. A simple example is fetching data
over the network: even if the data size is always the same, there will
be differences because of network load variations.

If you use one queue, each consumer fetches a new work unit as soon it
has consumed the previous one. All consumers will be working as long as
there is work to do, without having to write any code to do the load
balancing.

With one queue for each consumer, you either have to assume that the
average processing time is the same (otherwise some consumers will be
idle at the end, while others are still busy processing work units), or
you need some clever code in the producer(s) or the driving code to
balance the loads. That's extra complexity for little or no benefit.

I like the simplicity of having one queue: the producer(s) put work
units on the queue with no concern which consumer will process them or
how many consumers there even are; likewise the consumer(s) don't know
and don't need to know where their work units come from. And the work
gets automatically distributed to whichever consumer has first finished
its previous work unit.

> And if the stuff you pass around needs disparate effort to consume,
> it seems to me that you can more easily balance the load by having
> specialised consumers, instead of instances of one humungous 
> "I can eat anything" consumer.

If there is a semantic difference, maybe yes; but I think it makes no
sense to differentiate purely on the expected execution times.

> I also think that having a queue per consumer thread makes it easier
> to replace the threads with processes and the queues with pipes or
> sockets if you need to do serious scaling later.

Perhaps, but isn't that a case of YAGNI and/or premature optimization?


-- 
The saddest aspect of life right now is that science gathers knowledge
faster than society gathers wisdom.
  -- Isaac Asimov

Roel Schroeven


From piet at cs.uu.nl  Fri May  1 18:08:55 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 02 May 2009 00:08:55 +0200
Subject: string processing question
References: <mailman.4855.1241110874.11746.python-list@python.org>
	<3fbff25a-530e-4364-a7e1-3db6255b0d6b@k19g2000prh.googlegroups.com>
	<mailman.4897.1241166798.11746.python-list@python.org>
	<eqAKl.2289$_e5.2089@newsfe21.ams2>
	<mailman.4915.1241186567.11746.python-list@python.org>
Message-ID: <m2skjopjbc.fsf@cs.uu.nl>

>>>>> Kurt Mueller <mu at problemlos.ch> (KM) wrote:

>KM> But from the command line python interprets the code
>KM> as 'latin_1' I presume. That is why I have to convert
>KM> the "?" with unicode().
>KM> Am I right?

There are a couple of stages:
1. Your terminal emulator interprets your keystrokes, encodes them in a
   sequence of bytes and passes them to the shell. How the characters
   are encodes depends on the encoding used in the terminal emulator. So
   for example when the terminal is set to utf-8, your "?" is converted
   to two bytes: \xc3 and \xa4.
2. The shell passes these bytes to the python command. 
3. The python interpreter must interpret these bytes with some decoding.
   If you use them in a bytes string they are copied as such, so in the
   example above the string "?" will consist of the 2 bytes '\xc3\xa4'.
   If your terminal encoding would have been iso-8859-1, the string
   would have had a single byte '\xe4'. If you use it in a unicode
   string the Python parser has to convert it to unicode. If there is an
   encoding declaration in the source than that is used. Of course it
   should be the same as the actual encoding used by the shell (or the
   editor when you have a script saved in a file) otherwise you have a
   problem. If there is no encoding declaration in the source Python has
   to guess. It appears that in Python 2.x the default is iso-8859-1 but
   in Python 3.x it will be utf-8. You should avoid making any
   assumptions about this default.
4. During runtime unicode characters that have to be printed, written to
   a file, passed as file names or arguments to other processes etc.
   have to be encoded again to a sequence of bytes. In this case Python
   refuses to guess. Also you can't use the same encoding as in step 3,
   because the program can run on a completely different system than
   were it was compiled to byte code. So if the (unicode) string isn't
   ASCII and no encoding is given you get an error. The encoding can be
   given explicitely, or depending on the context, by sys.stdout.encoding,
   sys.getdefaultencoding or PYTHONIOENCODING (from 2.6 on). 

Unfortunately there is no equivalent to PYTHONIOENCODING for the
interpretation of the source text, it only works on run-time.

Example:
python -c 'print len(u"?")'
prints 2 on my system, because my terminal is utf-8 so the ? is passed
as 2 bytes (\xc3\xa4), but these are interpreted by Python 2.6.2 as two
iso-8859-1 bytes.

If I do 
python -c 'print u"?"' in my terminal I therefore get two characters: ??
but if I do this in Emacs I get:
UnicodeEncodeError: 'ascii' codec can't encode characters in position
0-1: ordinal not in range(128)
because my Emacs doesn't pass the encoding of its terminal emulation.

However:
python -c '# -*- coding:utf-8 -*-
print len(u"?")'
will correctly print 1.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From nad at acm.org  Fri May  1 18:10:26 2009
From: nad at acm.org (Ned Deily)
Date: Fri, 01 May 2009 15:10:26 -0700
Subject: Help! Can't get program to run.
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
Message-ID: <nad-56E909.15102601052009@ger.gmane.org>

In article <7618rjF1a3t8jU1 at mid.uni-berlin.de>,
 "Diez B. Roggisch" <deets at nospam.web.de> wrote:
> seanm.py at gmail.com schrieb:
> > I think this is maybe the most basic problem possible, but I can't get
> > even the most basic Python to run on OS X using Terminal or IDLE. I
> > used the IDLE editor to create a file with one line of code
> > 
> > print 'text string'
> > 
> > and I saved the file as module1.py. When using terminal I entered
> > "python" to load the interpreter or whatever and then tried
> > 
> > python module1.py
> > 
> > but I got an error message. I've tried using the file path instead of
> > module1.py and that didn't work either. I've tried moving the file to
> > different places, my desktop, hard drive, etc., and none of that
> > worked either. In IDLE I tried similar things and only got error
> > messages there too.
> > 
> > Needless to say this is a frustrating start to learning this langauge.
> > I'd really appreciate any help getting this to work, so I can move on
> > the actual language. Thanks so much.
> 
> It would have helped if you had given us the *actual* error-message.
>  From what little information you give, it appears as if you do 
> something very basic wrong - instead of doing
> $ python
>  >>> python mymodule.py 
> (where $ is the shell/terminal and >>> the python-prompt)
> you either do
> $ python
>  >>> print "hello"
> or
> $ python mymodule.py 
> to execute mymodule directly.

And from within OS X IDLE itself, if you create or open the file 
mymodule.py, it will be in a separate window and, as long as that window 
is selected, you can run the file directly within IDLE by selecting "Run 
Module" from the "Run" menu.   So, no need to use the Terminal if you 
don't want to.

-- 
 Ned Deily,
 nad at acm.org



From castironpi at gmail.com  Fri May  1 18:13:34 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 1 May 2009 15:13:34 -0700 (PDT)
Subject: Multiprocessing Pool and functions with many arguments
References: <880bfeb5-cc71-4ff5-b7a6-ffd6404597f0@v23g2000pro.googlegroups.com>
Message-ID: <678d4c8b-63e0-4b63-8623-bd730b451d35@w40g2000yqd.googlegroups.com>

On Apr 29, 1:01?pm, "psaff... at googlemail.com"
<psaff... at googlemail.com> wrote:
> I'm trying to get to grips with the multiprocessing module, having
> only used ParallelPython before.
>
> based on this example:
>
> http://docs.python.org/library/multiprocessing.html#using-a-pool-of-w...
>
> what happens if I want my "f" to take more than one argument? I want
> to have a list of tuples of arguments and have these correspond the
> arguments in f, but it keeps complaining that I only have one argument
> (the tuple). Do I have to pass in a tuple and break it up inside f? I
> can't use multiple input lists, as I would with regular map.
>
> Thanks,
>
> Peter

The basic constructor should allow it.

http://docs.python.org/library/multiprocessing.html#the-process-class

p = Process(target=f, args=('bob',))

I think you are imagining:

result = pool.apply_async(f, [ *(1,2,3), *(4,5,6) ] )

But I don't know of a way.


From rpmuller at gmail.com  Fri May  1 18:21:11 2009
From: rpmuller at gmail.com (Rick)
Date: Fri, 1 May 2009 15:21:11 -0700 (PDT)
Subject: Profiling gives very different predictions of best algorithm
References: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
	<mailman.4947.1241214614.11746.python-list@python.org>
Message-ID: <a6ec8b96-7374-44f0-918c-2f4940409c60@y34g2000prb.googlegroups.com>

Sorry, I'm running the function:

def debugsuite():
    import profile,pstats
    profile.run('runsuite()','prof')
    prof = pstats.Stats('prof')
    prof.strip_dirs().sort_stats('time').print_stats(15)

where runsuite() runs the Hartree-Fock energy of a water molecule, and
is given by:


import unittest,logging
from PyQuante.CI import CIS
from PyQuante.Molecule import Molecule
from PyQuante.MP import MP2
from PyQuante.OEP import oep_hf,oep_hf_an
from PyQuante.PyQuante2 import SCF,SubspaceSolver,DmatSolver

class UnitTests(unittest.TestCase):
    def setUp(self):
        from PyQuante.Molecule import Molecule
        self.h2o = Molecule('h2o',[(8,(0,0,0)),(1,(1.,0,0)),(1,
(0,1.,0))],
                            units="Angstrom")

    def testH2OHF(self):
        h2o_hf = SCF(self.h2o,method='HF')
        h2o_hf.iterate()
        self.assertAlmostEqual(h2o_hf.energy,-76.011755864850628,4)

def runsuite(verbose=True):
    # To use psyco, uncomment this line:
    #import psyco; psyco.full()
    if verbose: verbosity=2
    else: verbosity=1
    # If you want more output, uncomment this line:
    #logging.basicConfig(format="%(message)s",level=logging.DEBUG)
    suite = unittest.TestLoader().loadTestsFromTestCase(UnitTests)
    unittest.TextTestRunner(verbosity=verbosity).run(suite)
    # Running without verbosity is equivalent to replacing the above
    # two lines with the following:
    #unittest.main()
    return


On May 1, 3:50?pm, Terry Reedy <tjre... at udel.edu> wrote:
> Rick Muller wrote:
> > I'm the main programmer for the PyQuante package, a quantum chemistry
> > package in Python. I'm trying to speed up one of my rate determining
> > steps. Essentially, I have to decide between two algorithms:
>
> > 1. Packed means that I compute N**4/8 integrals, and then do a bunch
> > of indexing operations to unpack;
> > 2. Unpacked means that I compute all N**4 integrals, but don't have to
> > do any indexing.
>
> > Raw timing the two options show that packed is clearly faster (12.5
> > sec vs 20.6 sec). However, the profilings show very different results.
> > I have the results below. Clearly I'm going to use the packed scheme.
> > My question to the mailing list is what am I doing wrong with my
> > profiling that it shows such poor predictions?
>
> That *might* be easier to answer if you were to show exactly what you
> did to get the odd-looking results ;-)



From guenther.dietrich at spamfence.net  Fri May  1 18:28:45 2009
From: guenther.dietrich at spamfence.net (=?UTF-8?Q?G=C3=BCnther?= Dietrich)
Date: Sat, 02 May 2009 00:28:45 +0200
Subject: ctypes: reference of a struct member?
References: <mailman.4935.1241199602.11746.python-list@python.org>
Message-ID: <tl9sc6-5ru.ln1@spamfence.net>

ma <mabdelkader at gmail.com> wrote:

>If I have this struct in C:
>
>struct spam {
>     int ham;
>  char foo;
>};
>
>
>if I have this declaration:
>struct spam s_;
>
>If I wanted to pass a reference to a function of s_'s foo character, I
>can do something like this:
>
>somefunc(&s_.foo)
>
>How do I do the same thing in ctypes?
>ctypes.addressof(s_) + ctypes.sizeof(spam.foo)*(1)

See ctypes.create_string_buffer().
To unpack the struct elements received from the C function, use 
struct.unpack().

Here some example:

    def rssiam_volt_Q(self):
        '''Output Voltage Query
        '''
        query_buffer = ctypes.create_string_buffer(8)
        self.rssiam_32_dll.rssiam_volt_Q.argtypes = [ctypes.c_long,
                                                     ctypes.c_char_p]
        result = self.rssiam_32_dll.rssiam_volt_Q(self.session,
                                                  query_buffer)
        if result != VI_SUCCESS:
            raise IOError, 'rssiam_volt_Q: result = %d' % result
        return(struct.unpack('d', query_buffer.raw)[0])


In this case, it is a 64 bits float (= double) value that is returned by 
reference (query_buffer).
Attention, struct.unpack() returns a tuple, even when there is only a 
single element to extract from the buffer.




Regards,

G?nther


From http  Fri May  1 18:47:49 2009
From: http (Paul Rubin)
Date: 01 May 2009 15:47:49 -0700
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz>
	<49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<gtdtsr$qv1$3@lust.ihug.co.nz>
	<020ab4a3$0$20667$c3e8da3@news.astraweb.com>
	<dabe1eec-0848-45fb-bf85-4f7b235900b5@l12g2000yqo.googlegroups.com>
Message-ID: <7xmy9w1luy.fsf@ruckus.brouhaha.com>

Aaron Brady <castironpi at gmail.com> writes:
> I think you are looking at an 'ireduce' function, which doesn't
> exist in 'itertools' yet.

Nothing is being done with the return value.

  sum(1 for x in imap(func, seq)) 

is enough to force evaluation of func on each element of seq.


From piet at cs.uu.nl  Fri May  1 18:57:09 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 02 May 2009 00:57:09 +0200
Subject: urllib2 and threading
References: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
Message-ID: <m2ocucph2y.fsf@cs.uu.nl>

>>>>> robean <st1999 at gmail.com> (R) wrote:

>R> def get_info_from_url(url):
>R>   """ A dummy version of the function simply visits urls and prints
>R> the url of the page. """
>R>   try:
>R>     page = urllib2.urlopen(url)
>R>   except urllib2.URLError, e:
>R>     print "**** error ****", e.reason
>R>   except urllib2.HTTPError, e:
>R>     print "**** error ****", e.code

There's a problem here. HTTPError is a subclass of URLError so it should
be first. Otherwise when you have an HTTPError (like a 404 File not
found) it will be caught by the "except URLError", but it will not have
a reason attribute, and then you get an exception in the except clause
and the thread will crash.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From malkocb at gmail.com  Fri May  1 19:04:04 2009
From: malkocb at gmail.com (Berkin Malkoc)
Date: Sat, 2 May 2009 02:04:04 +0300
Subject: is it possible to traverse two lists simulatenously using python
In-Reply-To: <c1870d60904292331q2a4b02b9g6747db1f733648ee@mail.gmail.com>
References: <c1870d60904292331q2a4b02b9g6747db1f733648ee@mail.gmail.com>
Message-ID: <3e22924c0905011604v5a8b08dcj464959f12b267988@mail.gmail.com>

You should be looking for "zip"..

On Thu, Apr 30, 2009 at 9:31 AM,  <mobiledreamers at gmail.com> wrote:
> Python
> for i,j in topgirls, richgirls:
>     print i,j
>
> Cheetah
> #for $i,$j in $topgirls, $richgirls
> $i, $j
> #end for
> This doesnt work
>
> --
> Bidegg worlds best auction site
> http://bidegg.com
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From fetchinson at googlemail.com  Fri May  1 19:18:09 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Fri, 1 May 2009 16:18:09 -0700
Subject: is it possible to traverse two lists simulatenously using python
In-Reply-To: <c1870d60904292331q2a4b02b9g6747db1f733648ee@mail.gmail.com>
References: <c1870d60904292331q2a4b02b9g6747db1f733648ee@mail.gmail.com>
Message-ID: <fbe2e2100905011618m5f6319bet76c16892ab9d6f39@mail.gmail.com>

> Python
> for i,j in topgirls, richgirls:
>     print i,j

for i, j in zip( topgirls, richgirls ):
    print i,j

HTH,
Daniel

> Cheetah
> #for $i,$j in $topgirls, $richgirls$i, $j
> #end for
> This doesnt work



-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From mark.seagoe at gmail.com  Fri May  1 19:31:38 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Fri, 1 May 2009 16:31:38 -0700 (PDT)
Subject: web access through vpn client
Message-ID: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>

Hi;

I am trying to retrieve financial data off website for stock market
analysis.  Just hobby not for pay.  I actually am impressed that
urllib2 and BeautifulSoup work pretty well to do what I want, and the
first little routine actually gets the data from the web page...
except if my VPN client is turned on.

I've looked around for a solution but can't find... perhaps I'm not
entering the right search words.  I don't even know where to start.
Can anyone suggest some good reading, or basic idea how to approach?

Thanks,
Mark


From norseman at hughes.net  Fri May  1 19:58:50 2009
From: norseman at hughes.net (norseman)
Date: Fri, 01 May 2009 16:58:50 -0700
Subject: string processing question
In-Reply-To: <m2skjopjbc.fsf@cs.uu.nl>
References: <mailman.4855.1241110874.11746.python-list@python.org>	<3fbff25a-530e-4364-a7e1-3db6255b0d6b@k19g2000prh.googlegroups.com>	<mailman.4897.1241166798.11746.python-list@python.org>	<eqAKl.2289$_e5.2089@newsfe21.ams2>	<mailman.4915.1241186567.11746.python-list@python.org>
	<m2skjopjbc.fsf@cs.uu.nl>
Message-ID: <49FB8CBA.5090803@hughes.net>

Piet van Oostrum wrote:
>>>>>> Kurt Mueller <mu at problemlos.ch> (KM) wrote:
> 
>> KM> But from the command line python interprets the code
>> KM> as 'latin_1' I presume. That is why I have to convert
>> KM> the "?" with unicode().
>> KM> Am I right?
> 
> There are a couple of stages:
> 1. Your terminal emulator interprets your keystrokes, encodes them in a
>    sequence of bytes and passes them to the shell. How the characters
>    are encodes depends on the encoding used in the terminal emulator. So
>    for example when the terminal is set to utf-8, your "?" is converted
>    to two bytes: \xc3 and \xa4.
> 2. The shell passes these bytes to the python command. 
> 3. The python interpreter must interpret these bytes with some decoding.
>    If you use them in a bytes string they are copied as such, so in the
>    example above the string "?" will consist of the 2 bytes '\xc3\xa4'.
>    If your terminal encoding would have been iso-8859-1, the string
>    would have had a single byte '\xe4'. If you use it in a unicode
>    string the Python parser has to convert it to unicode. If there is an
>    encoding declaration in the source than that is used. Of course it
>    should be the same as the actual encoding used by the shell (or the
>    editor when you have a script saved in a file) otherwise you have a
>    problem. If there is no encoding declaration in the source Python has
>    to guess. It appears that in Python 2.x the default is iso-8859-1 but
>    in Python 3.x it will be utf-8. You should avoid making any
>    assumptions about this default.
> 4. During runtime unicode characters that have to be printed, written to
>    a file, passed as file names or arguments to other processes etc.
>    have to be encoded again to a sequence of bytes. In this case Python
>    refuses to guess. Also you can't use the same encoding as in step 3,
>    because the program can run on a completely different system than
>    were it was compiled to byte code. So if the (unicode) string isn't
>    ASCII and no encoding is given you get an error. The encoding can be
>    given explicitely, or depending on the context, by sys.stdout.encoding,
>    sys.getdefaultencoding or PYTHONIOENCODING (from 2.6 on). 
> 
> Unfortunately there is no equivalent to PYTHONIOENCODING for the
> interpretation of the source text, it only works on run-time.
> 
> Example:
> python -c 'print len(u"?")'
> prints 2 on my system, because my terminal is utf-8 so the ? is passed
> as 2 bytes (\xc3\xa4), but these are interpreted by Python 2.6.2 as two
> iso-8859-1 bytes.
> 
> If I do 
> python -c 'print u"?"' in my terminal I therefore get two characters: ??
> but if I do this in Emacs I get:
> UnicodeEncodeError: 'ascii' codec can't encode characters in position
> 0-1: ordinal not in range(128)
> because my Emacs doesn't pass the encoding of its terminal emulation.
> 
> However:
> python -c '# -*- coding:utf-8 -*-
> print len(u"?")'
> will correctly print 1.
===============================

Thank you. I knew there had to be something simpler than brute force.

I have missed seeing the explanations for:
     python -c '# -*- coding:utf-8 -*-
in the 2.5 docs. Where can I find these? (the python -c  is for config, 
I presume?)

By the way - the however: python...\nprint... snippet bombs in 2.5.2
1st bomb:  looking for closing '    #so I add one and remove one below
2nd bomb:  bad syntax               # I play awhile and join EMACS
3rd bomb:   Non-ASCII character '\xe4' in file....no encoding declared..

Python flatly states it's not ASCII and quits. Python print refuses to 
handle high bit set bytes in 2.5.2....

The thank you is for pointing out how it works. I can use sed to fix for 
file listing purposes.  (Python won't like them, but a second pass thru 
sed can give me something python can use and the two names can go on a 
line on the cheat sheet.)

Barry, Kurt - do understand using sed to change the incoming names?
Put the python in a box and use the Linux mc, ls, sed and echo routines 
to get the names into a form python can use while making the cheat sheet 
at the same time.  Substitutions like  a for ?  will generally be 
acceptable. Yes or No?  The cheat sheet can show the ? in the original 
name because the OS functions allow it. I have no doubt there will be 
some exceptions. :(
Once the names are "ASCII" you can get the python out & put it to work.

Just to head off the comments that it's not .... whatever

ls -1 | cheater.scr | python_program.py    IS PURE UNIX

Unix is designed for this. Files from different parts of the world?  If 
you can see the name as something besides ????? make a cheeter for each 
'Page'.    mc /path/to/dir/of/choice
            ls -1 >dummy
            highlight dummy
            F3
            F4    and read the hex
takes me longer to type it in here than to do it. (leading spaces)  :)

Today: 20090430


Steve

ps. Piet - thanks for including the version specifics.  It makes a huge 
difference in expectations and allowances.


From apt.shansen at gmail.com  Fri May  1 20:41:03 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 1 May 2009 17:41:03 -0700
Subject: web access through vpn client
In-Reply-To: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
References: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
Message-ID: <7a9c25c20905011741m6b5d4360yf32acdf99238a685@mail.gmail.com>

>
> I am trying to retrieve financial data off website for stock market
> analysis.  Just hobby not for pay.  I actually am impressed that
> urllib2 and BeautifulSoup work pretty well to do what I want, and the
> first little routine actually gets the data from the web page...
> except if my VPN client is turned on.
>

Usually when something like that happens with a VPN its because the VPN has
been configured to do so. Its the default usually and is a security
precaution.  The exact wording of the option varies from VPN client to VPN
client; and its usually hidden deep in 'advanced'. E.g., on the mac its
"Send all traffic over VPN connection", on Windows I /believe/ its something
like "Set as default gateway" but its been awhile since I had to tweak my
windows install. No idea what it looks like on the Cisco client.

--S
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From MrJean1 at gmail.com  Fri May  1 20:50:37 2009
From: MrJean1 at gmail.com (Jean)
Date: Fri, 1 May 2009 17:50:37 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<mailman.4898.1241167327.11746.python-list@python.org>
	<7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
	<mailman.4921.1241190260.11746.python-list@python.org>
	<ff9a9718-73a5-45f9-8c29-512cd344ac8b@r37g2000yqn.googlegroups.com>
	<b51e6b3a-3219-4b56-9b36-6494c059c761@y10g2000prc.googlegroups.com>
Message-ID: <75e47cc6-72bc-4941-802e-767f2187445f@d7g2000prl.googlegroups.com>

On May 1, 12:50?pm, Jean <MrJe... at gmail.com> wrote:
> On May 1, 10:56?am, CTO <debat... at gmail.com> wrote:
>
>
>
> > > sys.getsizeof() [a suggested solution] isn't platform-specific.
>
> > So, to answer the OP's question, you'd just do something like
>
> > def get_totalsize(obj):
> > ? ? ? ? total_size = sys.getsizeof(obj)
> > ? ? ? ? for value in vars(obj).values():
> > ? ? ? ? ? ? ? ? try: total_size += get_total_size(value)
> > ? ? ? ? ? ? ? ? except: total_size += sys.getsizeof(value)
> > ? ? ? ? return totalSize
>
> > def get_current_size(env):
> > ? ? ? ? size = 0
> > ? ? ? ? for value in env.values():
> > ? ? ? ? ? ? ? ? try: size += get_total_size(value)
> > ? ? ? ? ? ? ? ? except: pass
> > ? ? ? ? return size
>
> > get_current_size(vars())
>
> > and discount the weight of the interpreter?
>
> Keep in mind, sys.getsizeof(obj) returns only the size of the given
> object. ?Any referenced objects are not included. ?You can get the
> latter from gc.get_referents(obj).
>
> /Jean Brouwers
>
> PS) The asizeof(obj) function from this recipe <http://
> code.activestate.com/recipes/546530> does size the object plus its
> references, recursively.

Correction, the last sentence should be: The asizeof(obj) ... plus its
referents, recursively.


From gert.cuykens at gmail.com  Fri May  1 20:56:24 2009
From: gert.cuykens at gmail.com (gert)
Date: Fri, 1 May 2009 17:56:24 -0700 (PDT)
Subject: eval(WsgiApplication)
Message-ID: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>

I would like to read the following from a text file

from json import loads
from gert.db import Db
def application(environ, response):
    v = loads(environ['wsgi.input'].read(int(environ
['CONTENT_LENGTH'])).decode('utf-8'))
    db = Db()
    db.execute('UPDATE votes SET count=count+1 WHERE vid=?',(v
['vid'],))
    db.execute('SELECT * FROM votes')
    j = '{"rec":'+db.json()+',\n'
    j+= ' "des":'+db.jdes()+'}'
    j = j.encode('utf-8')
    response('200 OK', [('Content-type', 'text/
javascript;charset=utf-8'), ('Content-Length', str(len(j)))])
    return [j]

execute it, and wrap a new function name around it for example

def wrapper(environ, response):
     exec(file)
     return application(environ, response)

How do I do this in python3?


From martin.hellwig at dcuktec.org  Fri May  1 20:57:32 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sat, 02 May 2009 01:57:32 +0100
Subject: web access through vpn client
In-Reply-To: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
References: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
Message-ID: <EuOdnVFd2dThB2bUnZ2dnUVZ8gqdnZ2d@bt.com>

mark.seagoe at gmail.com wrote:
> Hi;
> 
> I am trying to retrieve financial data off website for stock market
> analysis.  Just hobby not for pay.  I actually am impressed that
> urllib2 and BeautifulSoup work pretty well to do what I want, and the
> first little routine actually gets the data from the web page...
> except if my VPN client is turned on.
> 
> I've looked around for a solution but can't find... perhaps I'm not
> entering the right search words.  I don't even know where to start.
> Can anyone suggest some good reading, or basic idea how to approach?
> 
> Thanks,
> Mark

When the VPN client is on, can you actually still browse the 'classical' 
way to the website in question?
I ask this because many cooperate VPN clients have a way of shutting 
down all other access besides to the VPN server (which is very annoying 
but I can see the logic behind it).

If that is the case your VPN network might have a webproxy which needs 
to be configured to continue browsing when connected to the VPN. For 
python you can automate this by checking for access to the proxy and use 
it if it is there.

-- 
MPH
http://blog.dcuktec.com


From tjreedy at udel.edu  Fri May  1 21:29:26 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 01 May 2009 21:29:26 -0400
Subject: is it possible to traverse two lists simulatenously using python
In-Reply-To: <c1870d60904292331q2a4b02b9g6747db1f733648ee__25264.7264780991$1241218583$gmane$org@mail.gmail.com>
References: <c1870d60904292331q2a4b02b9g6747db1f733648ee__25264.7264780991$1241218583$gmane$org@mail.gmail.com>
Message-ID: <gtg7ll$104$1@ger.gmane.org>

mobiledreamers at gmail.com wrote:
> Python
> for i,j in topgirls, richgirls:
>     print i,j

for i,y in zip(a,b): ...



From tjreedy at udel.edu  Fri May  1 21:38:12 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 01 May 2009 21:38:12 -0400
Subject: Profiling gives very different predictions of best algorithm
In-Reply-To: <a6ec8b96-7374-44f0-918c-2f4940409c60@y34g2000prb.googlegroups.com>
References: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>	<mailman.4947.1241214614.11746.python-list@python.org>
	<a6ec8b96-7374-44f0-918c-2f4940409c60@y34g2000prb.googlegroups.com>
Message-ID: <gtg864$25c$1@ger.gmane.org>

Rick wrote:
[Rearrangee to put answer after question.  Unless your name is Guido and 
you are making a short pronouncement that you want to be sure everyone 
sees, please do not toppost]

 >>> My question to the mailing list is what am I doing wrong with my
 >>> profiling that it shows such poor predictions?
[i wrote]
 >> That *might* be easier to answer if you were to show exactly what you
 >> did to get the odd-looking results ;-)

> Sorry, I'm running the function:
> 
> def debugsuite():
>     import profile,pstats
>     profile.run('runsuite()','prof')
>     prof = pstats.Stats('prof')
>     prof.strip_dirs().sort_stats('time').print_stats(15)
> 
> where runsuite() runs the Hartree-Fock energy of a water molecule, and
> is given by:
> 
> 
> import unittest,logging
> from PyQuante.CI import CIS
> from PyQuante.Molecule import Molecule
> from PyQuante.MP import MP2
> from PyQuante.OEP import oep_hf,oep_hf_an
> from PyQuante.PyQuante2 import SCF,SubspaceSolver,DmatSolver

As far as I could see, you only actually use Molecule and SCF

> 
> class UnitTests(unittest.TestCase):
>     def setUp(self):
>         from PyQuante.Molecule import Molecule

and you repeat the Molecule import here.

>         self.h2o = Molecule('h2o',[(8,(0,0,0)),(1,(1.,0,0)),(1,
> (0,1.,0))],
>                             units="Angstrom")
> 
>     def testH2OHF(self):
>         h2o_hf = SCF(self.h2o,method='HF')
>         h2o_hf.iterate()

I presume that this is where the time goes.

>         self.assertAlmostEqual(h2o_hf.energy,-76.011755864850628,4)
> 
> def runsuite(verbose=True):
>     # To use psyco, uncomment this line:
>     #import psyco; psyco.full()
>     if verbose: verbosity=2
>     else: verbosity=1
>     # If you want more output, uncomment this line:
>     #logging.basicConfig(format="%(message)s",level=logging.DEBUG)
>     suite = unittest.TestLoader().loadTestsFromTestCase(UnitTests)
>     unittest.TextTestRunner(verbosity=verbosity).run(suite)
>     # Running without verbosity is equivalent to replacing the above
>     # two lines with the following:
>     #unittest.main()
>     return

I presume in your overall time text, you ran the two versions of the 
algorith 'naked'.  But, for some reason, you are profiling them embedded 
inside a test suite and runner.  It does not seem that this should 
affect relative timing, but I have seen some pretty strange behaviors. 
At best, it will add noise.

Let me expand my question: what did you do differently between the two 
profile runs?

tjr



From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 21:47:32 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 02 May 2009 01:47:32 GMT
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz> <49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<gtdtsr$qv1$3@lust.ihug.co.nz>
	<020ab4a3$0$20667$c3e8da3@news.astraweb.com>
	<dabe1eec-0848-45fb-bf85-4f7b235900b5@l12g2000yqo.googlegroups.com>
Message-ID: <020b99a5$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 15:03:30 -0700, Aaron Brady wrote:

> On May 1, 4:30?am, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> On Fri, 01 May 2009 16:30:19 +1200, Lawrence D'Oliveiro wrote:
>> > I have never written anything so unbelievable in my life. And I hope
>> > I never will.
>>
>> I didn't say you did. If anyone thought I was quoting Lawrence's code,
>> I'd be surprised. It was not my intention to put words into your mouth.
>>
>> But seeing as you have replied, perhaps you could tell us something.
>> Given so much you despise using non-bools in truth contexts, how would
>> you re-write my example to avoid "a or b or c"?
>>
>> for x in a or b or c:
>> ? ? do_something_with(x)

[...]
> I don't think it would be very common to write Steven's construction for
> arbitrary values of 'a', 'b', and 'c'.

I don't care about "arbitrary values" for a, b and c. I don't expect a 
solution that works for (say) a=None, b=5, c=[]. I'm happy to restrict 
the arguments to all be arbitrary sequence-like objects.

I'm even happy for somebody to give a solution with further restrictions, 
like "if I know before hand that all three are lists, then I do blah...". 
But state your restrictions up front.




-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 21:52:27 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 02 May 2009 01:52:27 GMT
Subject: Question about the wording in the python documents.
References: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
Message-ID: <020b9acb$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 13:02:59 -0700, grocery_stocker wrote:

> I don't get how urllib2.urlopen() can take a Request object. When I do
> the following....
> 
> [cdalten at localhost ~]$ python
> Python 2.4.3 (#1, Oct  1 2006, 18:00:19) [GCC 4.1.1 20060928 (Red Hat
> 4.1.1-28)] on linux2 Type "help", "copyright", "credits" or "license"
> for more information.
>>>> import urllib2
>>>>
>>>> url = 'http://www.google.com'
>>>> req = urllib2.Request(url)
>>>> response = urllib2.urlopen(req)
>>>>
>>>>
> req is clearly an instance of urllib2.Request and not a Request object.

It looks like a Request object to me. You create it by calling 
urllib2.Request(url), and it's an object.

I don't understand your objection. Is it that the documentation calls it 
Request instead of urllib2.Request? Or that it calls it an object instead 
of an instance? 

In either case, I think you're picking a nit so small that it isn't 
actually there. All objects are instances (in Python), and all instances 
are objects. And it should be clear from context that Request refers to 
urllib2.Request, and not some mythical built-in Request object. I don't 
believe that needs to be spelled out.


-- 
Steven


From dayscondor at ameritech.net  Fri May  1 22:10:16 2009
From: dayscondor at ameritech.net (watermod)
Date: Sat, 02 May 2009 02:10:16 GMT
Subject: debian apt somehow created python hell! - help
Message-ID: <pan.2009.05.02.02.17.17@ameritech.net>

I was doing one of those auto apt-get gui things with update manager in 
Debian and not watching the error log so I don't know where it started.

It involves only Python stuff.  I don't know Python but apps use it.


The current apt state is that python apps are failing install in:
/usr/sbin/update-python-modules

typical error list looks like:

dpkg: warning - old pre-removal script returned error exit status 1
dpkg - trying script from the new package instead ...
WARNING: python-gtk2-doc.private does not exist.
         Some bytecompiled files may be left behind.
Traceback (most recent call last):
  File "/usr/sbin/update-python-modules", line 437, in <module>
    public_packages[package].install(need_postinstall)
  File "/usr/sbin/update-python-modules", line 232, in __getitem__
    self[name] = SharedFileList (path)
  File "/usr/sbin/update-python-modules", line 146, in __init__
    for line in file(path):
IOError: [Errno 21] Is a directory
dpkg: error processing /var/cache/apt/archives/python-gtk2-
doc_2.14.1-2_all.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
Traceback (most recent call last):
  File "/usr/sbin/update-python-modules", line 437, in <module>
    public_packages[package].install(need_postinstall)
  File "/usr/sbin/update-python-modules", line 232, in __getitem__
    self[name] = SharedFileList (path)
  File "/usr/sbin/update-python-modules", line 146, in __init__
    for line in file(path):
IOError: [Errno 21] Is a directory
dpkg: error while cleaning up:

on and on and on....
The following:

 dpkg -C

gives:
The following packages are in a mess due to serious problems during
installation.  They must be reinstalled for them (and any packages
that depend on them) to function properly:
 python-reportbug     Python modules for interacting with bug tracking 
systems
 lsb-release          Linux Standard Base version reporting utility
 python-ogg           Python interface to the Ogg library
 system-config-lvm    A utility for graphically configuring Logical 
Volumes
 bitpim               utility to communicate with many CDMA phones
 bitpim-lib           architecture-dependent helper files for BitPim
 python-glade2        GTK+ bindings: Glade support
 python-gtk2          Python bindings for the GTK+ widget set
 python-feedparser    Universal Feed Parser for Python
 python-gtk2-doc      Python bindings for the GTK+ widget set - 
documentation
 k3d                  3D modeling and animation system

The following packages have been unpacked but not yet configured.
They must be configured using dpkg --configure or the configure
menu option in dselect for them to work:
 acroread-plugins     Plugins for Adobe Acrobat(R) Reader
 python-roman         module for generating/analyzing Roman numerals
 python-soappy        SOAP Support for Python
 python-glpk          Python bindings to the GNU Linear Programming Kit
 python-dialog        Python module for making simple Text/Console-mode 
user in
 python-biggles       Scientific plotting package for Python
 python-gd            Python module wrapper for libgd
 python-clutter       Open GL based interactive canvas library - Python 
binding
 python-decoratortools version-agnostic decorators support for Python
 python-fpconst       Utilities for handling IEEE 754 floating point 
special va
 acroread-data        data files for acroread
 python-galago-gtk    GTK+ widgets for the Galago presence library 
(Python inte
 python-utmp          python module for working with utmp
 python-debianbts     Python interface to Debian's Bug Tracking System
 python-gobject-dev   Development headers for the GObject Python bindings
 acroread-escript     Adobe EScript Plug-In
 python-dhm           collection of Python utilities / helper
 python-unit          unit test framework for Python
 acpid                Utilities for using ACPI power management
 python-sqlalchemy    SQL toolkit and Object Relational Mapper for Python
 python-gnutls        Python wrapper for the GNUTLS library
 python-xlib          Interface for Python to the X11 Protocol
 acroread             Adobe Acrobat Reader: Portable Document Format file 
viewe
 python-pyinotify     simple Linux inotify Python bindings
 python-facebook      Python wrappers for the Facebook API
 reportbug            reports bugs in the Debian distribution
 python-ll-core       Python modules for colors, make, cron, daemons, 
URLs, tem
 python-beaker        Simple WSGI middleware that uses the Myghty 
Container API
 python-xcbgen        X C Binding - protocol binding generator
 libroot-dev          Header files for ROOT
 python-dcop          DCOP bindings for Python
 python-docutils      utilities for the documentation of Python modules
 libroot-python-dev   Python extension for ROOT - development files
 python-extractor     extracts meta-data from files of arbitrary type 
(Python b
 python-debian        Python modules to work with Debian-related data 
formats
 python-cheetah       text-based template engine and Python code generator
 python-galago        Galago presence library (Python interface)

The following packages are only half configured, probably due to problems
configuring them the first time.  The configuration should be retried 
using
dpkg --configure <package> or the configure menu option in dselect:
 python-support       automated rebuilding support for Python modules


The last one appears to be a key problem....   reconfigure gives the same 
dam error.

Chicken egg problem of some sort...
I can't add or remove anything python with the debian package tools...
Maybe I could install by hand by a tarball if I knew where to stick stuff

I unpacked a tarball to: /usr/src/python-support-1.0.2
but have no idea what to do...  I am not a python guy... c, c++ perl but  
brain dead for this...
/usr/src/python-support-1.0.2# ls -CF
COPYING     debian/  movemodules*    pysupport.py	     README    
update-python-modules*
debhelper/  hold     parseversions*  python-support.private  runtime/  
update-python-modules.8

SO!!!     HELP ...  SUGGESTIONS?





From mark.seagoe at gmail.com  Fri May  1 22:50:58 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Fri, 1 May 2009 19:50:58 -0700 (PDT)
Subject: web access through vpn client
References: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
	<EuOdnVFd2dThB2bUnZ2dnUVZ8gqdnZ2d@bt.com>
Message-ID: <3b82989a-7e54-461a-b18f-dc90d803c0f9@x29g2000prf.googlegroups.com>

On May 1, 5:57?pm, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> mark.sea... at gmail.com wrote:
> > Hi;
>
> > I am trying to retrieve financial data off website for stock market
> > analysis. ?Just hobby not for pay. ?I actually am impressed that
> > urllib2 and BeautifulSoup work pretty well to do what I want, and the
> > first little routine actually gets the data from the web page...
> > except if my VPN client is turned on.
>
> > I've looked around for a solution but can't find... perhaps I'm not
> > entering the right search words. ?I don't even know where to start.
> > Can anyone suggest some good reading, or basic idea how to approach?
>
> > Thanks,
> > Mark
>
> When the VPN client is on, can you actually still browse the 'classical'
> way to the website in question?
> I ask this because many cooperate VPN clients have a way of shutting
> down all other access besides to the VPN server (which is very annoying
> but I can see the logic behind it).
>
> If that is the case your VPN network might have a webproxy which needs
> to be configured to continue browsing when connected to the VPN. For
> python you can automate this by checking for access to the proxy and use
> it if it is there.
>
> --
> MPHhttp://blog.dcuktec.com

Yes when Cisco AnyConnect VPN client is connected, I can browse w/
IE.  I think the packets get encrypted and possibly go to my company's
server and out from there, because then also Outlook connects to my
company, Communicator works, etc.  With VPN off I can browse and
Python can get URL, but no connection through my company's server & no
encryption.

Where can I find out more about how to configure the webproxy, if the
info is handy?  Thanks!

Mark


From gagsl-py2 at yahoo.com.ar  Fri May  1 23:51:29 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 02 May 2009 00:51:29 -0300
Subject: ctypes: reference of a struct member?
References: <148918f0905011039t1a9a8561nf36c6fe4534e3694@mail.gmail.com>
Message-ID: <op.utaab3qnx6zn5v@gabriel.sleipnir-bsas>

En Fri, 01 May 2009 14:39:39 -0300, ma <mabdelkader at gmail.com> escribi?:

> If I have this struct in C:
>
> struct spam {
>      int ham;
>   char foo;
> };
>
>
> if I have this declaration:
> struct spam s_;
>
> If I wanted to pass a reference to a function of s_'s foo character, I
> can do something like this:
>
> somefunc(&s_.foo)
>
> How do I do the same thing in ctypes?
> ctypes.addressof(s_) + ctypes.sizeof(spam.foo)*(1)

slightly less ugly:

ctypes.addressof(s_) + spam.foo.offset

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May  1 23:56:50 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 02 May 2009 00:56:50 -0300
Subject: ctypes: reference of a struct member?
References: <148918f0905011039t1a9a8561nf36c6fe4534e3694@mail.gmail.com>
	<op.utaab3qnx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <op.utaak0hxx6zn5v@gabriel.sleipnir-bsas>

En Sat, 02 May 2009 00:51:29 -0300, Gabriel Genellina  
<gagsl-py2 at yahoo.com.ar> escribi?:
> En Fri, 01 May 2009 14:39:39 -0300, ma <mabdelkader at gmail.com> escribi?:
>
>> If I have this struct in C:
>>
>> struct spam {
>>      int ham;
>>   char foo;
>> };
>>
>>
>> if I have this declaration:
>> struct spam s_;
>>
>> If I wanted to pass a reference to a function of s_'s foo character, I
>> can do something like this:
>>
>> somefunc(&s_.foo)
>>
>> How do I do the same thing in ctypes?
>> ctypes.addressof(s_) + ctypes.sizeof(spam.foo)*(1)
>
> ctypes.addressof(s_) + spam.foo.offset

Another way: ctypes from Python 2.6 lets you say:

byref(s_, spam.foo.offset)

-- 
Gabriel Genellina



From aahz at pythoncraft.com  Sat May  2 00:16:38 2009
From: aahz at pythoncraft.com (Aahz)
Date: 1 May 2009 21:16:38 -0700
Subject: urllib2 and threading
References: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
Message-ID: <gtghf6$af2$1@panix3.panix.com>

In article <de102095-b858-4d01-bec2-a7b4b7160caa at u39g2000pru.googlegroups.com>,
robean  <st1999 at gmail.com> wrote:
>
>Here's the problem: the script simply crashes after getting a a couple
>of urls and takes a long time to run (slower that a non-threaded
>version that I wrote and ran). Can anyone figure out what I am doing
>wrong? I am new to both threading and urllib2, so its possible that
>the SNAFU is quite obvious.

For an example, see

http://www.pythoncraft.com/OSCON2001/index.html
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Typing is cheap.  Thinking is expensive."  --Roy Smith


From research at johnohagan.com  Sat May  2 00:22:20 2009
From: research at johnohagan.com (John O'Hagan)
Date: Sat, 2 May 2009 04:22:20 +0000
Subject: object query assigned variable name?
In-Reply-To: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
Message-ID: <200905020422.20895.research@johnohagan.com>

On Fri, 1 May 2009, warpcat wrote:
> I've passed this around some other groups, and I'm being told
> "probably not possible".  But I thought I'd try here as well :)   I
> *did* search first, and found several similar threads, but they
> quickly tangented into other specifics of the language that were a bit
> over my head :)  At any rate, here's a simple example, I'd love to
> know if as shown, is somehow possible:
>
> Given an object:
>
> class Spam(object):
>     def __init__(self):
>         # stuff....
>
> I'd like it to print, when instanced, something like this:
> >>> s = Spam()
>
> I?m assigned to s!

If you just want the names an instance has in a given namespace, you could 
give your class a method like:

class KnowNames(object):
    def get_names(self, namespace):
        id_str = str(hex(id(self))[:-1])
        return [i for i in namespace if id_str in str(namespace[i])]

which will give you a list of names when called on an instance.

But if you try moving that method inside __init__(), it returns an empty list 
because any assignment is not yet in the namespace. 

I can see that it's tantalizing, though, because _somebody_ must know about 
the assignment; after all, we just executed it!

Regards,

John


From research at johnohagan.com  Sat May  2 00:48:47 2009
From: research at johnohagan.com (John O'Hagan)
Date: Sat, 2 May 2009 04:48:47 +0000
Subject: debian apt somehow created python hell! - help
In-Reply-To: <pan.2009.05.02.02.17.17@ameritech.net>
References: <pan.2009.05.02.02.17.17@ameritech.net>
Message-ID: <200905020448.48038.research@johnohagan.com>

On Sat, 2 May 2009, watermod wrote:
> I was doing one of those auto apt-get gui things with update manager in
> Debian and not watching the error log so I don't know where it started.
>
> It involves only Python stuff.  I don't know Python but apps use it.
>
>
> The current apt state is that python apps are failing install in:
> /usr/sbin/update-python-modules
>
> typical error list looks like:
>
[snip Debian package-management errors]

I sympathise, but those errors are typical of a borked Debian upgrade (usually 
best fixed by waiting or downgrading if the problem is in the repository 
itself, else by manually reinstalling the messed-up package if the problem is 
local), not a python problem, so you'll get better answers on, say, 
debian-users. 

John


From ben+python at benfinney.id.au  Sat May  2 01:40:50 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sat, 02 May 2009 15:40:50 +1000
Subject: debian apt somehow created python hell! - help
References: <pan.2009.05.02.02.17.17@ameritech.net>
	<mailman.4962.1241239728.11746.python-list@python.org>
Message-ID: <87r5z8m599.fsf@benfinney.id.au>

John O'Hagan <research at johnohagan.com> writes:

> On Sat, 2 May 2009, watermod wrote:
> > The current apt state is that python apps are failing install in:
> > /usr/sbin/update-python-modules
> >
> [snip Debian package-management errors]
> ? you'll get better answerson, say, debian-users.

John refers to the Debian user discussion forum, a mailing list at
<URL:http://lists.debian.org/debian-user/>.

-- 
 \      ?Compulsory unification of opinion achieves only the unanimity |
  `\        of the graveyard.? ?Justice Roberts in 319 U.S. 624 (1943) |
_o__)                                                                  |
Ben Finney


From krmane at gmail.com  Sat May  2 03:45:22 2009
From: krmane at gmail.com (Krishnakant)
Date: Sat, 02 May 2009 13:15:22 +0530
Subject: problem with money datatype based calculations in python
Message-ID: <1241250322.4669.13.camel@kk-laptop>

hello all,
I am using postgresql as a database server for my db application.

The database is related to accounts and point of sales and many
calculations involve money datatype.

The application logic is totally done in python.  Now the problem is
that there is a situation where we calculate tax on % of the total
amount on the invoice.  The  percentage is in terms of float but the
eventual amount has to be in a money datatype.

The product cost comes in money datatype from postgresql and the tax %
comes in float.  So I would like to know if python supports some thing
similar to money datatype so that I can cast my total amount (in money )
divided by tax% (in float ) so money divided by float should be the
result and that result should be in money datatype.
For example a product x has the cost Rs. 100 which is stored in the
tabel as money type.  and in the tax table for that product the VAT is
5% and this 5% is stored in float datatype.  So after using both these
values the resulting total 105Rs. should be in money type and not float.
I awaite some reply,
Thanks in advice.
happy hacking.
Krishnakant.



From hackingkk at gmail.com  Sat May  2 04:12:58 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Sat, 02 May 2009 13:42:58 +0530
Subject: interesting float to money conversion problem
Message-ID: <1241251978.4669.16.camel@kk-laptop>

hello all,
> > I am using postgresql as a database server for my db application.
> > 
> > The database is related to accounts and point of sales and many
> > calculations involve money datatype.
> > 
> > The application logic is totally done in python.  Now the problem is
> > that there is a situation where we calculate tax on % of the total
> > amount on the invoice.  The  percentage is in terms of float but the
> > eventual amount has to be in a money datatype.
> > 
> > The product cost comes in money datatype from postgresql and the tax %
> > comes in float.  So I would like to know if python supports some thing
> > similar to money datatype so that I can cast my total amount (in money )
> > divided by tax% (in float ) so money divided by float should be the
> > result and that result should be in money datatype.
> > For example a product x has the cost Rs. 100 which is stored in the
> > tabel as money type.  and in the tax table for that product the VAT is
> > 5% and this 5% is stored in float datatype.  So after using both these
> > values the resulting total 105Rs. should be in money type and not float.
> > I awaite some reply,
> > Thanks in advice.
> > happy hacking.
> > Krishnakant.
> > 
> > --
> > http://mail.python.org/mailman/listinfo/python-list



From arnodel at googlemail.com  Sat May  2 04:23:58 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 02 May 2009 09:23:58 +0100
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz>
	<49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<gtdtsr$qv1$3@lust.ihug.co.nz>
	<020ab4a3$0$20667$c3e8da3@news.astraweb.com>
	<dabe1eec-0848-45fb-bf85-4f7b235900b5@l12g2000yqo.googlegroups.com>
	<020b99a5$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <m2ws8z52w1.fsf@googlemail.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

> On Fri, 01 May 2009 15:03:30 -0700, Aaron Brady wrote:
>
>> On May 1, 4:30?am, Steven D'Aprano <st... at REMOVE-THIS-
>> cybersource.com.au> wrote:
>>> On Fri, 01 May 2009 16:30:19 +1200, Lawrence D'Oliveiro wrote:
>>> > I have never written anything so unbelievable in my life. And I hope
>>> > I never will.
>>>
>>> I didn't say you did. If anyone thought I was quoting Lawrence's code,
>>> I'd be surprised. It was not my intention to put words into your mouth.
>>>
>>> But seeing as you have replied, perhaps you could tell us something.
>>> Given so much you despise using non-bools in truth contexts, how would
>>> you re-write my example to avoid "a or b or c"?
>>>
>>> for x in a or b or c:
>>> ? ? do_something_with(x)
>
> [...]
>> I don't think it would be very common to write Steven's construction for
>> arbitrary values of 'a', 'b', and 'c'.
>
> I don't care about "arbitrary values" for a, b and c. I don't expect a 
> solution that works for (say) a=None, b=5, c=[]. I'm happy to restrict 
> the arguments to all be arbitrary sequence-like objects.
>
> I'm even happy for somebody to give a solution with further restrictions, 
> like "if I know before hand that all three are lists, then I do blah...". 
> But state your restrictions up front.

If a, b, c are names or literals, then I guess you could do this:

for seq in a, b, c:
    if seq: break
for x in seq:
    do_something_with(x)

I have never been in a situation where I needed something like this,
though.
-- 
Arnaud


From arnodel at googlemail.com  Sat May  2 04:25:47 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 02 May 2009 09:25:47 +0100
Subject: eval(WsgiApplication)
References: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
Message-ID: <m2skjn52t0.fsf@googlemail.com>

gert <gert.cuykens at gmail.com> writes:

> I would like to read the following from a text file
>
> from json import loads
> from gert.db import Db
> def application(environ, response):
>     v = loads(environ['wsgi.input'].read(int(environ
> ['CONTENT_LENGTH'])).decode('utf-8'))
>     db = Db()
>     db.execute('UPDATE votes SET count=count+1 WHERE vid=?',(v
> ['vid'],))
>     db.execute('SELECT * FROM votes')
>     j = '{"rec":'+db.json()+',\n'
>     j+= ' "des":'+db.jdes()+'}'
>     j = j.encode('utf-8')
>     response('200 OK', [('Content-type', 'text/
> javascript;charset=utf-8'), ('Content-Length', str(len(j)))])
>     return [j]
>
> execute it, and wrap a new function name around it for example
>
> def wrapper(environ, response):
>      exec(file)
>      return application(environ, response)
>
> How do I do this in python3?

What's wrong with importing it?

-- 
Arnaud


From subhakolkata1234 at gmail.com  Sat May  2 04:26:14 2009
From: subhakolkata1234 at gmail.com (subhakolkata1234 at gmail.com)
Date: Sat, 2 May 2009 01:26:14 -0700 (PDT)
Subject: File handling problem.
Message-ID: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>

Dear Group,

I am using Python2.6 and has created a file where I like to write some
statistical values I am generating. The statistical values are
generating in a nice way, but as I am going to write it, it is not
taking it, the file is opening or closing properly but the values are
not getting stored. It is picking up arbitrary values from the
generated set of values and storing it. Is there any solution for it?

Best Regards,
SBanerjee.


From chambon.pascal at wanadoo.fr  Sat May  2 04:46:28 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Sat, 02 May 2009 10:46:28 +0200
Subject: File handling problem.
In-Reply-To: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>
References: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>
Message-ID: <49FC0864.5080309@wanadoo.fr>

subhakolkata1234 at gmail.com a ?crit :
> Dear Group,
>
> I am using Python2.6 and has created a file where I like to write some
> statistical values I am generating. The statistical values are
> generating in a nice way, but as I am going to write it, it is not
> taking it, the file is opening or closing properly but the values are
> not getting stored. It is picking up arbitrary values from the
> generated set of values and storing it. Is there any solution for it?
>
> Best Regards,
> SBanerjee.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
>   
Hello

Could you post excerpt of your file-handling code ?
It might be a buffering problem (although when the file closes, I think 
buffers get flushed), else it's really weird...

Regards,
pascal



From paul at subsignal.org  Sat May  2 05:06:44 2009
From: paul at subsignal.org (paul)
Date: Sat, 02 May 2009 11:06:44 +0200
Subject: eval(WsgiApplication)
In-Reply-To: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
References: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
Message-ID: <gth2d4$e7o$1@ger.gmane.org>

gert schrieb:
> I would like to read the following from a text file
Hi gert,

I'm puzzled, what is wrong with using wsgi as advertised? Just import 
your code and insert it in the wsgi chain no?

cheers
  Paul

> 
> from json import loads
> from gert.db import Db
> def application(environ, response):
>     v = loads(environ['wsgi.input'].read(int(environ
> ['CONTENT_LENGTH'])).decode('utf-8'))
>     db = Db()
>     db.execute('UPDATE votes SET count=count+1 WHERE vid=?',(v
> ['vid'],))
>     db.execute('SELECT * FROM votes')
>     j = '{"rec":'+db.json()+',\n'
>     j+= ' "des":'+db.jdes()+'}'
>     j = j.encode('utf-8')
>     response('200 OK', [('Content-type', 'text/
> javascript;charset=utf-8'), ('Content-Length', str(len(j)))])
>     return [j]
> 
> execute it, and wrap a new function name around it for example
> 
> def wrapper(environ, response):
>      exec(file)
>      return application(environ, response)
> 
> How do I do this in python3?
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From gert.cuykens at gmail.com  Sat May  2 05:49:20 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 2 May 2009 02:49:20 -0700 (PDT)
Subject: eval(WsgiApplication)
References: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
	<m2skjn52t0.fsf@googlemail.com>
Message-ID: <39057d64-921e-4150-a382-ec1d443a383f@j12g2000vbl.googlegroups.com>

On May 2, 10:25?am, Arnaud Delobelle <arno... at googlemail.com> wrote:
> gert <gert.cuyk... at gmail.com> writes:
> > I would like to read the following from a text file
>
> > from json import loads
> > from gert.db import Db
> > def application(environ, response):
> > ? ? v = loads(environ['wsgi.input'].read(int(environ
> > ['CONTENT_LENGTH'])).decode('utf-8'))
> > ? ? db = Db()
> > ? ? db.execute('UPDATE votes SET count=count+1 WHERE vid=?',(v
> > ['vid'],))
> > ? ? db.execute('SELECT * FROM votes')
> > ? ? j = '{"rec":'+db.json()+',\n'
> > ? ? j+= ' "des":'+db.jdes()+'}'
> > ? ? j = j.encode('utf-8')
> > ? ? response('200 OK', [('Content-type', 'text/
> > javascript;charset=utf-8'), ('Content-Length', str(len(j)))])
> > ? ? return [j]
>
> > execute it, and wrap a new function name around it for example
>
> > def wrapper(environ, response):
> > ? ? ?exec(file)
> > ? ? ?return application(environ, response)
>
> > How do I do this in python3?
>
> What's wrong with importing it?

The problem is that my wsgi files have a wsgi extention for mod_wsgi
use

package
- __init__.py
- session.py
- db.py
- sqlite
- - sql.db
- www
- - test.htm
- - test.css
- - test.js
- - test.wsgi

i would like to make this package work both in mod_wsgi and cherrypy
server
mod_wsgi has a .wsgi handler because it is recommended to rename the
wsgi file with wsgi extensions to avoid double imports
cherrypy server has a dispatcher class



From chambon.pascal at wanadoo.fr  Sat May  2 05:56:28 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Sat, 02 May 2009 11:56:28 +0200
Subject: Warning of missing side effects
In-Reply-To: <towb-59CC0F.11282302052009@news.individual.de>
References: <towb-59CC0F.11282302052009@news.individual.de>
Message-ID: <49FC18CC.4040807@wanadoo.fr>

Tobias Weber a ?crit :
> Hi,
> being new to Python I find remarkable that I don't see any side effects. 
> That's especially true for binding. First, it is a statement, so this 
> won't work:
>
>    if x = q.pop():
>       print x # output only true values
>
> Second, methods in the standard library either return a value OR modify 
> the reciever, so even if assignment was an expression the above wouldn't 
> work.
>
> Only it still wouldn't, because IF is a statement as well. So no ternary:
>
>    x = if True: 5 else: 7;
>
> However there is one bit of magic, functions implicitly return None. So 
> while the following will both run without error, only one actually works:
>
>    x = 'foo'.upper()
>    y = ['f', 'b'].reverse()
>
> Now I mentioned that the mutable types don't have functions that mutate 
> and return something, so I only have to remember that...
>
> But I'm used to exploiting side effect, and sometimes forget this rule 
> in my own classes. IS THERE A WAY to have the following produce a 
> runtime error?
>
>    def f():
>       x = 5
>       # no return
>
>    y = f()
>
> Maybe use strict ;)
>
>   
Hello

Just to note that if "['f', 'b'].reverse()" doesn't return the new 
value, there is a corersponding function : "reversed(mylist)" which does 
it (idem, sorted(list) <-> list.sort())  B-)

Concerning your question on warnings, well I guess that after a little 
time in python, you won't make mistakes on "side effects" anymore ;

But if you want to add checks to your methods, you should see towards 
decorators or metaclasses : they allow you to wrap your methods inside 
other methods, of which the only point couldbe, for example, to check 
what your methods returtn and raise a warning if it returns "None". But 
the problem is, sometimes you WANT them to return None....

If you want to detect methods that don't have explicit "return" 
statements, then you'll have to play with abstract syntax trees it 
seems... much trouble for not much gain.
I guess you'll quickly get the pythonic habits without needing all that ^^

Regards,
pascal



From martin.hellwig at dcuktec.org  Sat May  2 06:01:32 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sat, 02 May 2009 11:01:32 +0100
Subject: web access through vpn client
In-Reply-To: <3b82989a-7e54-461a-b18f-dc90d803c0f9@x29g2000prf.googlegroups.com>
References: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
	<EuOdnVFd2dThB2bUnZ2dnUVZ8gqdnZ2d@bt.com>
	<3b82989a-7e54-461a-b18f-dc90d803c0f9@x29g2000prf.googlegroups.com>
Message-ID: <TvadnXMrGYqZh2HUnZ2dnUVZ8uydnZ2d@bt.com>

mark.seagoe at gmail.com wrote:
> On May 1, 5:57 pm, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
> wrote:
>> mark.sea... at gmail.com wrote:
>>> Hi;
>>> I am trying to retrieve financial data off website for stock market
>>> analysis.  Just hobby not for pay.  I actually am impressed that
>>> urllib2 and BeautifulSoup work pretty well to do what I want, and the
>>> first little routine actually gets the data from the web page...
>>> except if my VPN client is turned on.
>>> I've looked around for a solution but can't find... perhaps I'm not
>>> entering the right search words.  I don't even know where to start.
>>> Can anyone suggest some good reading, or basic idea how to approach?
>>> Thanks,
>>> Mark
>> When the VPN client is on, can you actually still browse the 'classical'
>> way to the website in question?
>> I ask this because many cooperate VPN clients have a way of shutting
>> down all other access besides to the VPN server (which is very annoying
>> but I can see the logic behind it).
>>
>> If that is the case your VPN network might have a webproxy which needs
>> to be configured to continue browsing when connected to the VPN. For
>> python you can automate this by checking for access to the proxy and use
>> it if it is there.
>>
>> --
>> MPHhttp://blog.dcuktec.com
> 
> Yes when Cisco AnyConnect VPN client is connected, I can browse w/
> IE.  I think the packets get encrypted and possibly go to my company's
> server and out from there, because then also Outlook connects to my
> company, Communicator works, etc.  With VPN off I can browse and
> Python can get URL, but no connection through my company's server & no
> encryption.
> 
> Where can I find out more about how to configure the webproxy, if the
> info is handy?  Thanks!
> 
> Mark

Most likely your IE gets automatically configured for using a proxy when 
the VPN is made, just check your IE settings ounce you are connected to 
the VPN particular the Connection / LAN-connection settings.
Or query what is set in the registry at :
'HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet
Settings'

And use the content (if set) as the proxy address in the urllib module.

You might find this module useful for that:
http://docs.python.org/library/_winreg.html

-- 
MPH
http://blog.dcuktec.com


From martin at v.loewis.de  Sat May  2 06:02:55 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 02 May 2009 12:02:55 +0200
Subject: Warning of missing side effects
In-Reply-To: <towb-59CC0F.11282302052009@news.individual.de>
References: <towb-59CC0F.11282302052009@news.individual.de>
Message-ID: <49FC1A4F.6040502@v.loewis.de>

> But I'm used to exploiting side effect, and sometimes forget this rule 
> in my own classes. IS THERE A WAY to have the following produce a 
> runtime error?
> 
>    def f():
>       x = 5
>       # no return
> 
>    y = f()

Typically, this will produce a runtime error fairly quickly,
namely when you *use* the (presumed) return value of f().
You would normally try to perform some computation with y,
or invoke methods on it - and then you see that it is None.

So while it is not possible to get an exception on the
assignment, you will usually get a runtime error sooner
or later (most of the time, sooner).

FWIW, pylint -e reports on your code

E:  5: Assigning to function call which doesn't return

Regards,
Martin


From mail at microcorp.co.za  Sat May  2 06:38:01 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sat, 2 May 2009 12:38:01 +0200
Subject: Multiprocessing.Queue - I want to end.
References: <200904301649.10341.kyrie@uh.cu><mailman.4899.1241167799.11746.python-list@python.org>
	<2mKKl.16353$B17.1674@newsfe26.ams2>
Message-ID: <00a601c9cb12$152d25e0$0d00a8c0@Hendrik>

: "Roel Schroeven" <rschroev_nospam_ml at fastmail.fm> wrote:


> Hendrik van Rooyen schreef:
> > I have always wondered why people do the one queue many getters thing.
> 
> Because IMO it's the simplest and most elegant solution.

That is fair enough...

> > 
> > Given that the stuff you pass is homogenous in that it will require a
> > similar amount of effort to process, is there not a case to be made
> > to have as many queues as consumers, and to round robin the work?
> 
> Could work if the processing time for each work unit is exactly the same
> (otherwise one or more consumers will be idle part of the time), but in
> most cases that is not guaranteed. A simple example is fetching data
> over the network: even if the data size is always the same, there will
> be differences because of network load variations.
> 
> If you use one queue, each consumer fetches a new work unit as soon it
> has consumed the previous one. All consumers will be working as long as
> there is work to do, without having to write any code to do the load
> balancing.
> 
> With one queue for each consumer, you either have to assume that the
> average processing time is the same (otherwise some consumers will be
> idle at the end, while others are still busy processing work units), or
> you need some clever code in the producer(s) or the driving code to
> balance the loads. That's extra complexity for little or no benefit.
> 
> I like the simplicity of having one queue: the producer(s) put work
> units on the queue with no concern which consumer will process them or
> how many consumers there even are; likewise the consumer(s) don't know
> and don't need to know where their work units come from. And the work
> gets automatically distributed to whichever consumer has first finished
> its previous work unit.

This is all true in the case of a job that starts, runs and finishes.
I am not so sure it applies to something that has a long life.

> 
> > And if the stuff you pass around needs disparate effort to consume,
> > it seems to me that you can more easily balance the load by having
> > specialised consumers, instead of instances of one humungous 
> > "I can eat anything" consumer.
> 
> If there is a semantic difference, maybe yes; but I think it makes no
> sense to differentiate purely on the expected execution times.

The idea is basically that you have the code that classifies in one
place only, instead of running in all the instances of the consumer.
Feels better to me, somehow.

> 
> > I also think that having a queue per consumer thread makes it easier
> > to replace the threads with processes and the queues with pipes or
> > sockets if you need to do serious scaling later.
> 
> Perhaps, but isn't that a case of YAGNI and/or premature optimization?

Yes and no:

Yes - You Are Gonna Need It.
and 
No it is never premature to use a decent structure.

:-)

- Hendrik




From basti.wiesner at gmx.net  Sat May  2 07:14:30 2009
From: basti.wiesner at gmx.net (Sebastian Wiesner)
Date: Sat, 02 May 2009 13:14:30 +0200
Subject: Question about the wording in the python documents.
References: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
	<020b9acb$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <gth9um$d9i$1@hoshi.visyn.net>

<Steven D'Aprano>
> I don't understand your objection. Is it that the documentation calls it
> Request instead of urllib2.Request? Or that it calls it an object instead
> of an instance?
I guess the latter ...

> In either case, I think you're picking a nit so small that it isn't
> actually there. All objects are instances (in Python), and all instances
> are objects.
Exactly, so strictly seen, "Request object" could possibly refer to the 
urllib2.Request class itself.  I guess, the OP would prefer the term 
"Request instance", emphasizing, that an instance of the request class has 
to be passed, not he class itself.

-- 
Freedom is always the freedom of dissenters.
                                      (Rosa Luxemburg)



From ldo at geek-central.gen.new_zealand  Sat May  2 07:25:24 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 02 May 2009 23:25:24 +1200
Subject: Question about the wording in the python documents.
References: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
Message-ID: <gthaj4$rqb$1@lust.ihug.co.nz>

In message <cb978535-4092-49ac-8d9f-
a457d5fd61a5 at k19g2000prh.googlegroups.com>, grocery_stocker wrote:

> req is clearly an instance of urllib2.Request and not a Request object.

"Object" is a term commonly used to mean "instance of a class". In Python, 
classes are also objects, but if classes were meant rather than instances, I 
imagine it would say so.



From gdamjan at gmail.com  Sat May  2 08:15:38 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Sat, 02 May 2009 14:15:38 +0200
Subject: eval(WsgiApplication)
References: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
	<m2skjn52t0.fsf@googlemail.com>
	<39057d64-921e-4150-a382-ec1d443a383f@j12g2000vbl.googlegroups.com>
Message-ID: <a4qtc6-poi.ln1@archaeopteryx.softver.org.mk>

>> > How do I do this in python3?
>>
>> What's wrong with importing it?
> 
> The problem is that my wsgi files have a wsgi extention for mod_wsgi
> use
..
> mod_wsgi has a .wsgi handler because it is recommended to rename the
> wsgi file with wsgi extensions to avoid double imports
> cherrypy server has a dispatcher class


You can either use .py extension for the wsgi files OR use a custom 
importer that can import your .wsgi files
http://docs.python.org/library/modules.html



-- 
?????? ( http://softver.org.mk/damjan/ )

Scarlett Johansson: You always see the glass half-empty.
Woody Allen: No. I see the glass half-full, but of poison.



From aleksandar27 at brisiovonet.hr  Sat May  2 08:25:29 2009
From: aleksandar27 at brisiovonet.hr (alejandro)
Date: Sat, 2 May 2009 14:25:29 +0200
Subject: stuck with PyOBEX
References: <gt78o7$i9n$1@ss408.t-com.hr> <75opebF19fc22U1@mid.uni-berlin.de>
	<gt80qd$mbf$1@get-news01.get.basefarm.net>
	<gt8pbj$j3o$1@ss408.t-com.hr>
	<gtatk5$pff$1@get-news01.get.basefarm.net>
Message-ID: <gthe40$87q$1@ss408.t-com.hr>

I am having problems with connect() it says that it doesn't have sendall 
atribute.

Error:

Traceback (most recent call last):
  File "novi_pokusaj.py", line 25, in <module>
    client.connect()
  File "C:\Python25\lib\PyOBEX\client.py", line 356, in connect
    return Client.connect(self, header_list = [headers.Target(uuid)])
  File "C:\Python25\lib\PyOBEX\client.py", line 127, in connect
    response = self._send_headers(request, header_list, max_length)
  File "C:\Python25\lib\PyOBEX\client.py", line 81, in _send_headers
    self.socket.sendall(request.encode())
AttributeError: BluetoothSocket instance has no attribute 'sendall'>>> Exit 
Code: 1


Did you manage to run it under windows? 




From steve at REMOVE-THIS-cybersource.com.au  Sat May  2 09:24:47 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 02 May 2009 13:24:47 GMT
Subject: File handling problem.
References: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>
Message-ID: <020c3d0c$0$20667$c3e8da3@news.astraweb.com>

On Sat, 02 May 2009 01:26:14 -0700, subhakolkata1234 wrote:

> Dear Group,
> 
> I am using Python2.6 and has created a file where I like to write some
> statistical values I am generating. The statistical values are
> generating in a nice way, but as I am going to write it, it is not
> taking it, the file is opening or closing properly but the values are
> not getting stored. It is picking up arbitrary values from the generated
> set of values and storing it. Is there any solution for it?

Yes. Find the bug in your program and fix it.

If you'd like some help finding the bug, you'll need to give us a little 
bit more information. This website might help you:

http://www.catb.org/~esr/faqs/smart-questions.html



-- 
Steven


From dstanek at dstanek.com  Sat May  2 09:28:31 2009
From: dstanek at dstanek.com (David Stanek)
Date: Sat, 2 May 2009 09:28:31 -0400
Subject: object query assigned variable name?
In-Reply-To: <020b1b54$0$20667$c3e8da3@news.astraweb.com>
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
	<020b1b54$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <de32cc030905020628ma340777q5417667a3df610e0@mail.gmail.com>

On Fri, May 1, 2009 at 12:48 PM, Steven D'Aprano
<steve at remove-this-cybersource.com.au> wrote:
> On Fri, 01 May 2009 09:24:10 -0700, warpcat wrote:
>
>> I'd like it to print, when instanced, something like this:
>>
>>>>> s = Spam()
>> I?m assigned to s!
>>
>> But it seems prohibitively hard (based on my web and forum searches) for
>> an object to know what variable name is has been assigned to when
>> created.
>
> Can't be done. Objects don't know what names they are bound to.
>

While objects don't know what they are assigned to, they can be made
to find out. Unless you have a good use case I don't think that you
really want to be doing it.

DecoratorTools allows you to do this. I have code that allows you to
use a a function like:

    class C:
        attr = inject(Customer)

The inject function does know that it is being assigned to attr. There
is tracing/frame introspection black magic involved. So much so that I
have been debating removing that feature.

The code is on Bitbucket[1]. It has a little extra complication
because inject can also be used as a decorator. The key is the
decorate_assignment call in the inject function.

Again I don't think you really want to do this.

[1] http://bitbucket.org/dstanek/snake-guice/src/tip/snakeguice/decorators.py

-- 
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek


From davea at ieee.org  Sat May  2 09:35:50 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 02 May 2009 09:35:50 -0400
Subject: Warning of missing side effects
In-Reply-To: <towb-59CC0F.11282302052009@news.individual.de>
References: <towb-59CC0F.11282302052009@news.individual.de>
Message-ID: <49FC4C36.2000401@ieee.org>

Tobias Weber wrote:
> Hi,
> being new to Python I find remarkable that I don't see any side effects. 
> That's especially true for binding. First, it is a statement, so this 
> won't work:
>
>    if x = q.pop():
>       print x # output only true values
>
> Second, methods in the standard library either return a value OR modify 
> the reciever, so even if assignment was an expression the above wouldn't 
> work.
>
> Only it still wouldn't, because IF is a statement as well. So no ternary:
>
>    x = if True: 5 else: 7;
>
> However there is one bit of magic, functions implicitly return None. So 
> while the following will both run without error, only one actually works:
>
>    x = 'foo'.upper()
>    y = ['f', 'b'].reverse()
>
> Now I mentioned that the mutable types don't have functions that mutate 
> and return something, so I only have to remember that...
>
> But I'm used to exploiting side effect, and sometimes forget this rule 
> in my own classes. IS THERE A WAY to have the following produce a 
> runtime error?
>
>    def f():
>       x = 5
>       # no return
>
>    y = f()
>
> Maybe use strict ;)
>
>   
There's a ternary operator.  Check out the following sequence:

a = 42
b = 12 if a == 42 else 9
print a, b


Then try it again with a different value of a.

As for using = in an ordinary expression, I don't really miss it.  
Python allows multiple assignments in the same statement, but they're 
all to the same object.  For the kinds of things where I would have done 
an assignment inside an if or while (in C++), I usually can use a list 
comprehension or somesuch.




From guenther.dietrich at spamfence.net  Sat May  2 09:43:23 2009
From: guenther.dietrich at spamfence.net (=?UTF-8?Q?G=C3=BCnther?= Dietrich)
Date: Sat, 02 May 2009 15:43:23 +0200
Subject: problem with money datatype based calculations in python
References: <mailman.4963.1241250341.11746.python-list@python.org>
Message-ID: <r8vtc6-vh1.ln1@spamfence.net>

Krishnakant <krmane at gmail.com> wrote:

['money datatype' for database stored values]

What ist the real problem? Do you have problems converting results of 
float calculations to the 'money datatype' before storing them in the 
database, or do you want to avoid the precision issues which come with 
the conversion od non-integer values between binary and decimal?
In the latter case use the Decimal data type from module decimal (comes 
with the python distribution -- it is mentioned in the tutorial).



Regards,

G?nther


From arnodel at googlemail.com  Sat May  2 10:07:23 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 02 May 2009 15:07:23 +0100
Subject: Warning of missing side effects
References: <towb-59CC0F.11282302052009@news.individual.de>
	<mailman.4971.1241271373.11746.python-list@python.org>
Message-ID: <m2ocub4mzo.fsf@googlemail.com>

Dave Angel <davea at ieee.org> writes:

> Python allows multiple assignments in the same statement, but they're
> all to the same object.

Unless they are to different objects:

    a, b = 1, 2

-- 
Arnaud


From anuhacks at gmail.com  Sat May  2 10:08:28 2009
From: anuhacks at gmail.com (anusha k)
Date: Sat, 2 May 2009 19:38:28 +0530
Subject: problem with money datatype based calculations in python
In-Reply-To: <1241250322.4669.13.camel@kk-laptop>
References: <1241250322.4669.13.camel@kk-laptop>
Message-ID: <61f9a5fb0905020708g5e8f5a7exabd38c9eada3e2f2@mail.gmail.com>

Do calculations in postgresql and then call that calculated value from the
python.So no need to calculate in python at all


Njoy the share of Freedom,
Anusha Kadambala
On Sat, May 2, 2009 at 1:15 PM, Krishnakant <krmane at gmail.com> wrote:

> hello all,
> I am using postgresql as a database server for my db application.
>
> The database is related to accounts and point of sales and many
> calculations involve money datatype.
>
> The application logic is totally done in python.  Now the problem is
> that there is a situation where we calculate tax on % of the total
> amount on the invoice.  The  percentage is in terms of float but the
> eventual amount has to be in a money datatype.
>
> The product cost comes in money datatype from postgresql and the tax %
> comes in float.  So I would like to know if python supports some thing
> similar to money datatype so that I can cast my total amount (in money )
> divided by tax% (in float ) so money divided by float should be the
> result and that result should be in money datatype.
> For example a product x has the cost Rs. 100 which is stored in the
> tabel as money type.  and in the tax table for that product the VAT is
> 5% and this 5% is stored in float datatype.  So after using both these
> values the resulting total 105Rs. should be in money type and not float.
> I awaite some reply,
> Thanks in advice.
> happy hacking.
> Krishnakant.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From davea at ieee.org  Sat May  2 10:09:55 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 02 May 2009 10:09:55 -0400
Subject: problem with money datatype based calculations in python
In-Reply-To: <1241250322.4669.13.camel@kk-laptop>
References: <1241250322.4669.13.camel@kk-laptop>
Message-ID: <49FC5433.2070404@ieee.org>

Krishnakant wrote:
> hello all,
> I am using postgresql as a database server for my db application.
>
> The database is related to accounts and point of sales and many
> calculations involve money datatype.
>
> The application logic is totally done in python.  Now the problem is
> that there is a situation where we calculate tax on % of the total
> amount on the invoice.  The  percentage is in terms of float but the
> eventual amount has to be in a money datatype.
>
> The product cost comes in money datatype from postgresql and the tax %
> comes in float.  So I would like to know if python supports some thing
> similar to money datatype so that I can cast my total amount (in money )
> divided by tax% (in float ) so money divided by float should be the
> result and that result should be in money datatype.
> For example a product x has the cost Rs. 100 which is stored in the
> tabel as money type.  and in the tax table for that product the VAT is
> 5% and this 5% is stored in float datatype.  So after using both these
> values the resulting total 105Rs. should be in money type and not float.
> I awaite some reply,
> Thanks in advice.
> happy hacking.
> Krishnakant.
>
>
>   
Tax rate isn't divided, it's multiplied.  But probably that's just a 
typo in your message.

Short answer is use your money class to convert the float into money.  
And then test, to see that's really what you wanted.  Be sure and check 
the edge cases, because float is a binary system, and you can get both 
quantization and rounding problems converting between them.

Is the money you're dealing with decimal-based?  So maybe money values 
are integers plus two more digits of fractional precision?

It's going to be tough for somebody with no access to that "money type" 
to guess what your problem is.  What operations does it currently 
support?  If it supports multiply, then just change the tax rate to be a 
money type.  Unless of course you might have a tax rate of 5.221%   Does 
your money class support accurate conversion to class decimal?  In that 
case, convert to decimal, multiply, then convert back.

Or if money is really a fixed-point class, with assumed two digits, 
multiply the cost by 100 and convert to int.  Multiply by the tax, and 
convert back.

You also need to specify the government rules for the multiply.  Is 
rounding permitted, or must all fractions of a penny (assumption there) 
be rounded up?

Or switch everything to "class decimal" in the standard python library,  
You still have most of the questions to answer, but at least you'd be 
asking on the right forum.




From pxrepreza at gmail.com  Sat May  2 10:40:40 2009
From: pxrepreza at gmail.com (Paulo Repreza)
Date: Sat, 2 May 2009 07:40:40 -0700
Subject: debian apt somehow created python hell! - help
In-Reply-To: <pan.2009.05.02.02.17.17@ameritech.net>
References: <pan.2009.05.02.02.17.17@ameritech.net>
Message-ID: <d61936e00905020740k6f544cb9tfe357801d2bf9005@mail.gmail.com>

Hi,

Try this.
# aptitude update
# aptitude update
# aptitude upgrade you can also use # aptitude safe-upgrade

Hope it helps.

Paulo Repreza

On May 1, 2009 7:20 PM, "watermod" <dayscondor at ameritech.net> wrote:

I was doing one of those auto apt-get gui things with update manager in
Debian and not watching the error log so I don't know where it started.

It involves only Python stuff.  I don't know Python but apps use it.


The current apt state is that python apps are failing install in:
/usr/sbin/update-python-modules

typical error list looks like:

dpkg: warning - old pre-removal script returned error exit status 1
dpkg - trying script from the new package instead ...
WARNING: python-gtk2-doc.private does not exist.
        Some bytecompiled files may be left behind.
Traceback (most recent call last):
 File "/usr/sbin/update-python-modules", line 437, in <module>
   public_packages[package].install(need_postinstall)
 File "/usr/sbin/update-python-modules", line 232, in __getitem__
   self[name] = SharedFileList (path)
 File "/usr/sbin/update-python-modules", line 146, in __init__
   for line in file(path):
IOError: [Errno 21] Is a directory
dpkg: error processing /var/cache/apt/archives/python-gtk2-
doc_2.14.1-2_all.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
Traceback (most recent call last):
 File "/usr/sbin/update-python-modules", line 437, in <module>
   public_packages[package].install(need_postinstall)
 File "/usr/sbin/update-python-modules", line 232, in __getitem__
   self[name] = SharedFileList (path)
 File "/usr/sbin/update-python-modules", line 146, in __init__
   for line in file(path):
IOError: [Errno 21] Is a directory
dpkg: error while cleaning up:

on and on and on....
The following:

 dpkg -C

gives:
The following packages are in a mess due to serious problems during
installation.  They must be reinstalled for them (and any packages
that depend on them) to function properly:
 python-reportbug     Python modules for interacting with bug tracking
systems
 lsb-release          Linux Standard Base version reporting utility
 python-ogg           Python interface to the Ogg library
 system-config-lvm    A utility for graphically configuring Logical
Volumes
 bitpim               utility to communicate with many CDMA phones
 bitpim-lib           architecture-dependent helper files for BitPim
 python-glade2        GTK+ bindings: Glade support
 python-gtk2          Python bindings for the GTK+ widget set
 python-feedparser    Universal Feed Parser for Python
 python-gtk2-doc      Python bindings for the GTK+ widget set -
documentation
 k3d                  3D modeling and animation system

The following packages have been unpacked but not yet configured.
They must be configured using dpkg --configure or the configure
menu option in dselect for them to work:
 acroread-plugins     Plugins for Adobe Acrobat(R) Reader
 python-roman         module for generating/analyzing Roman numerals
 python-soappy        SOAP Support for Python
 python-glpk          Python bindings to the GNU Linear Programming Kit
 python-dialog        Python module for making simple Text/Console-mode
user in
 python-biggles       Scientific plotting package for Python
 python-gd            Python module wrapper for libgd
 python-clutter       Open GL based interactive canvas library - Python
binding
 python-decoratortools version-agnostic decorators support for Python
 python-fpconst       Utilities for handling IEEE 754 floating point
special va
 acroread-data        data files for acroread
 python-galago-gtk    GTK+ widgets for the Galago presence library
(Python inte
 python-utmp          python module for working with utmp
 python-debianbts     Python interface to Debian's Bug Tracking System
 python-gobject-dev   Development headers for the GObject Python bindings
 acroread-escript     Adobe EScript Plug-In
 python-dhm           collection of Python utilities / helper
 python-unit          unit test framework for Python
 acpid                Utilities for using ACPI power management
 python-sqlalchemy    SQL toolkit and Object Relational Mapper for Python
 python-gnutls        Python wrapper for the GNUTLS library
 python-xlib          Interface for Python to the X11 Protocol
 acroread             Adobe Acrobat Reader: Portable Document Format file
viewe
 python-pyinotify     simple Linux inotify Python bindings
 python-facebook      Python wrappers for the Facebook API
 reportbug            reports bugs in the Debian distribution
 python-ll-core       Python modules for colors, make, cron, daemons,
URLs, tem
 python-beaker        Simple WSGI middleware that uses the Myghty
Container API
 python-xcbgen        X C Binding - protocol binding generator
 libroot-dev          Header files for ROOT
 python-dcop          DCOP bindings for Python
 python-docutils      utilities for the documentation of Python modules
 libroot-python-dev   Python extension for ROOT - development files
 python-extractor     extracts meta-data from files of arbitrary type
(Python b
 python-debian        Python modules to work with Debian-related data
formats
 python-cheetah       text-based template engine and Python code generator
 python-galago        Galago presence library (Python interface)

The following packages are only half configured, probably due to problems
configuring them the first time.  The configuration should be retried
using
dpkg --configure <package> or the configure menu option in dselect:
 python-support       automated rebuilding support for Python modules


The last one appears to be a key problem....   reconfigure gives the same
dam error.

Chicken egg problem of some sort...
I can't add or remove anything python with the debian package tools...
Maybe I could install by hand by a tarball if I knew where to stick stuff

I unpacked a tarball to: /usr/src/python-support-1.0.2
but have no idea what to do...  I am not a python guy... c, c++ perl but
brain dead for this...
/usr/src/python-support-1.0.2# ls -CF
COPYING     debian/  movemodules*    pysupport.py            README
update-python-modules*
debhelper/  hold     parseversions*  python-support.private  runtime/
update-python-modules.8

SO!!!     HELP ...  SUGGESTIONS?



--
http://mail.python.org/mailman/listinfo/python-list
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From david at boddie.org.uk  Sat May  2 10:41:26 2009
From: david at boddie.org.uk (David Boddie)
Date: Sat, 02 May 2009 16:41:26 +0200
Subject: stuck with PyOBEX
References: <gt78o7$i9n$1@ss408.t-com.hr> <75opebF19fc22U1@mid.uni-berlin.de>
	<gt80qd$mbf$1@get-news01.get.basefarm.net>
	<gt8pbj$j3o$1@ss408.t-com.hr>
	<gtatk5$pff$1@get-news01.get.basefarm.net>
	<gthe40$87q$1@ss408.t-com.hr>
Message-ID: <gthm2m$sdr$1@get-news01.get.basefarm.net>

On Saturday 02 May 2009 14:25, alejandro wrote:

> I am having problems with connect() it says that it doesn't have sendall
> atribute.
> 
> Error:
> 
> Traceback (most recent call last):
>   File "novi_pokusaj.py", line 25, in <module>
>     client.connect()
>   File "C:\Python25\lib\PyOBEX\client.py", line 356, in connect
>     return Client.connect(self, header_list = [headers.Target(uuid)])
>   File "C:\Python25\lib\PyOBEX\client.py", line 127, in connect
>     response = self._send_headers(request, header_list, max_length)
>   File "C:\Python25\lib\PyOBEX\client.py", line 81, in _send_headers
>     self.socket.sendall(request.encode())
> AttributeError: BluetoothSocket instance has no attribute 'sendall'>>>
> Exit Code: 1
> 
> Did you manage to run it under windows?

I haven't tried to run it under Windows. I just assumed that BluetoothSocket
would have the same API on both Linux and Windows.

Looking around, it seems that this is something we can work around:

http://svn.navi.cx/misc/trunk/laserprop/client/BluetoothConduit.py

I'll send you an updated version to try if you would like to test it.

David


From rpmuller at gmail.com  Sat May  2 11:10:22 2009
From: rpmuller at gmail.com (Rick)
Date: Sat, 2 May 2009 08:10:22 -0700 (PDT)
Subject: Profiling gives very different predictions of best algorithm
References: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
	<mailman.4947.1241214614.11746.python-list@python.org>
	<a6ec8b96-7374-44f0-918c-2f4940409c60@y34g2000prb.googlegroups.com>
	<mailman.4958.1241228310.11746.python-list@python.org>
Message-ID: <74e32884-95b2-4e1d-9d3d-21f300bd8715@k19g2000prh.googlegroups.com>

On May 1, 7:38?pm, Terry Reedy <tjre... at udel.edu> wrote:

> I presume in your overall time text, you ran the two versions of the
> algorith 'naked'. ?But, for some reason, you are profiling them embedded
> inside a test suite and runner. ?It does not seem that this should
> affect relative timing, but I have seen some pretty strange behaviors.
> At best, it will add noise.
>
> Let me expand my question: what did you do differently between the two
> profile runs?

When I compute the electron repulsion integrals, the two different
methods are:

                        if packed:
                            ijkl = intindex(i,j,k,l)
                            Ints[ijkl] = coulomb(bfs[i],bfs[j],bfs
[k],bfs[l])
                        else:
                            val = coulomb(bfs[i],bfs[j],bfs[k],bfs[l])
                            Ints[i,j,k,l] = val
                            Ints[j,i,k,l] = val
                            Ints[i,j,l,k] = val
                            Ints[j,i,l,k] = val
                            Ints[k,l,i,j] = val
                            Ints[k,l,j,i] = val
                            Ints[l,k,i,j] = val
                            Ints[l,k,j,i] = val

and when I access the integrals the differences are:

                    if packed:
                        index = intindex(i,j,k,l)
                        temp[kl] = Ints[index]
                    else:
                        temp[kl] = Ints[i,j,k,l]

If you look at the profiling, I'm making something like 11M calls to
intindex, which is a routine I've written in C. I thought that by
storing all N**4 integrals (rather than the N**4/8 that packed stores)
would remove the need for the intindex calls and speed things up, but
it's 50% slower. I can't really figure out why it's slower, though,
since profiling makes it look like the slower version is faster.
Something like 30% of the time for the full PyQuante test suite is
taken up with calls to intindex, and I'd like to remove this if
possible.

I also wrote a version of the code where I stored all of the intindex
values in a Python dictionary rather than calling a C function. That
version appeared to be roughly the same speed when I profiled the
code, although I didn't test it without profiling (stupidly) because
at that point I didn't recognize the magnitude of the discrepancy
between the profiling/nonprofiling timings.

I was posting to the list mostly because I would like to know whether
I can do something different when I profile my code so that it give
results that correspond more closely to those that the nonprofiling
results give.



From ebonak at hotmail.com  Sat May  2 11:12:30 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 02 May 2009 11:12:30 -0400
Subject: for with decimal values?
Message-ID: <gthnsv$uil$1@ger.gmane.org>

Hello all,

Is there a Python construct to allow me to do something like
this:

    for i in range(-10.5, 10.5, 0.1):
      ...

If there is such a thing already available, I'd like
to use it, otherwise I can write a function to mimic this,
but I thought I'd check (my search yielded nothing).

Thanks,
Esmail



From aahz at pythoncraft.com  Sat May  2 11:17:27 2009
From: aahz at pythoncraft.com (Aahz)
Date: 2 May 2009 08:17:27 -0700
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
Message-ID: <gtho67$2qa$1@panix3.panix.com>

In article <mailman.4975.1241277173.11746.python-list at python.org>,
Esmail  <ebonak at hotmail.com> wrote:
>
>Is there a Python construct to allow me to do something like this:
>
>    for i in range(-10.5, 10.5, 0.1):
>      ...
>
>If there is such a thing already available, I'd like
>to use it, otherwise I can write a function to mimic this,
>but I thought I'd check (my search yielded nothing).

Write a function
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Typing is cheap.  Thinking is expensive."  --Roy Smith


From cdalten at gmail.com  Sat May  2 11:30:25 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sat, 2 May 2009 08:30:25 -0700 (PDT)
Subject: Question about the wording in the python documents.
References: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
	<020b9acb$0$20667$c3e8da3@news.astraweb.com>
	<gth9um$d9i$1@hoshi.visyn.net>
Message-ID: <4a751872-d92b-4b66-826e-f58a4c33bf16@v1g2000prd.googlegroups.com>

On May 2, 4:14 am, Sebastian Wiesner <basti.wies... at gmx.net> wrote:
> <Steven D'Aprano>> I don't understand your objection. Is it that the documentation calls it
> > Request instead of urllib2.Request? Or that it calls it an object instead
> > of an instance?
>
> I guess the latter ...
>
> > In either case, I think you're picking a nit so small that it isn't
> > actually there. All objects are instances (in Python), and all instances
> > are objects.
>
> Exactly, so strictly seen, "Request object" could possibly refer to the
> urllib2.Request class itself.  I guess, the OP would prefer the term
> "Request instance", emphasizing, that an instance of the request class has
> to be passed, not he class itself.
>

Yes, I personally think that the term "Request instance" would have
made it much clearer to us people that have never taken a computer
science class in our lives.


From davea at ieee.org  Sat May  2 11:32:02 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 02 May 2009 11:32:02 -0400
Subject: Warning of missing side effects
In-Reply-To: <m2ocub4mzo.fsf@googlemail.com>
References: <towb-59CC0F.11282302052009@news.individual.de>	<mailman.4971.1241271373.11746.python-list@python.org>
	<m2ocub4mzo.fsf@googlemail.com>
Message-ID: <49FC6772.8050700@ieee.org>

Arnaud Delobelle wrote:
> Dave Angel <davea at ieee.org> writes:
>
>   
>> Python allows multiple assignments in the same statement, but they're
>> all to the same object.
>>     
>
> Unless they are to different objects:
>
>     a, b = 1, 2
>
>   
You're right, of course.  I was referring to the multiple '=' form, and 
my statement was too general to be correct.

a = b = 42       is legal
a = (b=42) + 1      is not



From chambon.pascal at wanadoo.fr  Sat May  2 11:50:42 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Sat, 02 May 2009 17:50:42 +0200
Subject: for with decimal values?
In-Reply-To: <gtho67$2qa$1@panix3.panix.com>
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<gtho67$2qa$1@panix3.panix.com>
Message-ID: <49FC6BD2.8030304@wanadoo.fr>

Aahz a ?crit :
> In article <mailman.4975.1241277173.11746.python-list at python.org>,
> Esmail  <ebonak at hotmail.com> wrote:
>   
>> Is there a Python construct to allow me to do something like this:
>>
>>    for i in range(-10.5, 10.5, 0.1):
>>      ...
>>
>> If there is such a thing already available, I'd like
>> to use it, otherwise I can write a function to mimic this,
>> but I thought I'd check (my search yielded nothing).
>>     
>
> Write a function
>   
Else you can work on integers - for i in range (-105, 105) - and divide 
by ten just below... but concerning performances I don't know if it's a 
good idea ^^

Regards,
Pascal
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From darcy at druid.net  Sat May  2 11:57:34 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sat, 2 May 2009 11:57:34 -0400
Subject: problem with money datatype based calculations in python
In-Reply-To: <r8vtc6-vh1.ln1@spamfence.net>
References: <mailman.4963.1241250341.11746.python-list@python.org>
	<r8vtc6-vh1.ln1@spamfence.net>
Message-ID: <20090502115734.b280bf35.darcy@druid.net>

On Sat, 02 May 2009 15:43:23 +0200
"G?nther Dietrich" <guenther.dietrich at spamfence.net> wrote:
> Krishnakant <krmane at gmail.com> wrote:
> 
> ['money datatype' for database stored values]
> 
> What ist the real problem? Do you have problems converting results of 
> float calculations to the 'money datatype' before storing them in the 
> database, or do you want to avoid the precision issues which come with 
> the conversion od non-integer values between binary and decimal?
> In the latter case use the Decimal data type from module decimal (comes 
> with the python distribution -- it is mentioned in the tutorial).

And if you use PyGreSQL (http://www.PyGreSQL.org/) to connect to
the database then the money type is already converted to Decimal.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From ppearson at nowhere.invalid  Sat May  2 12:01:35 2009
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 2 May 2009 16:01:35 GMT
Subject: problem with money datatype based calculations in python
References: <mailman.4963.1241250341.11746.python-list@python.org>
Message-ID: <76392uF1aduopU1@mid.individual.net>

On Sat, 02 May 2009 13:15:22 +0530, Krishnakant <krmane at gmail.com> wrote:
> hello all,
> I am using postgresql as a database server for my db application.
>
> The database is related to accounts and point of sales and many
> calculations involve money datatype.
[snip]

As far as I can tell, Python has no type "money".  Is money
a class defined by some postgresql module you're using?  A
very small amount of specific information (e.g., a five-line
sample program that demonstrates the problem) would greatly
improve your chances of getting useful help.

-- 
To email me, substitute nowhere->spamcop, invalid->net.


From jjkk73 at gmail.com  Sat May  2 12:16:48 2009
From: jjkk73 at gmail.com (jorma kala)
Date: Sat, 2 May 2009 18:16:48 +0200
Subject: Accessing files in a directory which is a shortcut link (Windows)
Message-ID: <bda7ac6d0905020916j645815car9a55b49a1a984445@mail.gmail.com>

Hi,
I'd like to process files in a directory which is in fact a short cut link
to another directory (under windows XP).
If the path to the directory is for instance called c:\test. I have tried
both following code snipets for printing all names of files in the
directory:

++ snippet 1++

     for filename in glob.glob( os.path.join(r'c:\test', '*') ):
         print filename

++ snippet 2++

     for filename in glob.glob( os.path.join(r'c:\test.lnk', '*') ):
         print filename

Neither solution works.
Thanks very much for any help.
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From chambon.pascal at wanadoo.fr  Sat May  2 12:33:15 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Sat, 02 May 2009 18:33:15 +0200
Subject: Daemonic processes in multiprocessing - solved
In-Reply-To: <49F33FBA.1050101@gmail.com>
References: <49F33FBA.1050101@gmail.com>
Message-ID: <49FC75CB.6030802@wanadoo.fr>

Pascal Chambon a ?crit :
>
> Hello everyone
>
>
> I've just read the doc of the (awesome) "multiprocessing" module, and 
> there are some little things I don't understand, concerning daemon 
> processes (see quotes below).
>
> When a python process exits, the page says it attempts to join all its 
> children. Is this just a design choice, or are there constraints 
> behind this ? Because normally, when a parent process exits, its child 
> gets adopted by init, and that can be useful for creating daemons, 
> can't it ?
>
> Concerning daemons processes, precisely, the manual states that they 
> are all terminated when their parent process exits. But isn't it 
> contrary to the concept of dameons, which are supposed to have become 
> independent from their parent ?
>
> And I don't understand how "the initial value (of the "daemonic" 
> attribute) is inherited from the creating process", since "daemonic 
> processes are not allowed to create child processes". Isn't it the 
> same to say that "daemonic" is always false by default, then ?
> And finally, why can't daemonic processes have children ? If these 
> children get "orphaned" when the daemonic process gets terminated (by 
> its parent), they'll simply get adpoted by init, won't they ?
>
> Thanks a lot for helping me get rid of my confusion,
> regards,
> Pascal
>
>
> =========QUOTES==========
> daemon? 
> <http://docs.python.org/library/multiprocessing.html#multiprocessing.Process.daemon>
>
>     The process's daemon flag, a Boolean value. This must be set
>     before start()
>     <http://docs.python.org/library/multiprocessing.html#multiprocessing.Process.start>
>     is called.
>
>     The initial value is inherited from the creating process.
>
>     When a process exits, it attempts to terminate all of its daemonic
>     child processes.
>
>     Note that a daemonic process is not allowed to create child
>     processes. Otherwise a daemonic process would leave its children
>     orphaned if it gets terminated when its parent process exits.
>
>     ----------------------
>
> Similarly, if the child process is non-daemonic then the parent
> process may hang on exit when it tries to join all its non-daemonic children.
> --------------
> Remember also that non-daemonic
> processes will be automatically be joined.
>
>   
> ------------------------------------------------------------------------
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>   
Allright, I guess I hadn't understand much about "daemonic processes" in 
python's multiprocessing module.

So, for those interested, here is a clarification of the concepts, as 
far as I've understood - please poke me if I'm wrong somewhere.

Usually, in Unix, daemon processes are processes which got disconnected from
their parent process and from terminals, and work in the background, often under a
different user identity.
The python multiprocessing module has the concept of "daemon" too, but this
time in reference to the "threading" module, in which dameons are just
threads that wont prevent the application termination, even if they are
still running. Thus, daemonic processes launched through multiprocessing
API are normal processes that will be terminated (and not joined) if 
non-dameonic processes are all over.

Thus, not much in common between "traditionnal" *nix daemon processes, and python multiprocessing daemon processes.

Regards, 
pascal


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From arnodel at googlemail.com  Sat May  2 12:35:16 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 02 May 2009 17:35:16 +0100
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
Message-ID: <m2k54z4g57.fsf@googlemail.com>

Esmail <ebonak at hotmail.com> writes:

> Hello all,
>
> Is there a Python construct to allow me to do something like
> this:
>
>    for i in range(-10.5, 10.5, 0.1):
>      ...
>
> If there is such a thing already available, I'd like
> to use it, otherwise I can write a function to mimic this,
> but I thought I'd check (my search yielded nothing).
>
> Thanks,
> Esmail

In this particular example, you could do this:

    for i in range(-105, 105):
        i = 0.1*i
        ...
In general, you'd have to write your own (generator) function.

-- 
Arnaud


From mail at timgolden.me.uk  Sat May  2 12:35:35 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Sat, 02 May 2009 17:35:35 +0100
Subject: Accessing files in a directory which is a shortcut link (Windows)
In-Reply-To: <bda7ac6d0905020916j645815car9a55b49a1a984445@mail.gmail.com>
References: <bda7ac6d0905020916j645815car9a55b49a1a984445@mail.gmail.com>
Message-ID: <49FC7657.1040104@timgolden.me.uk>

jorma kala wrote:
> Hi,
> I'd like to process files in a directory which is in fact a short cut link
> to another directory (under windows XP).
> If the path to the directory is for instance called c:\test. I have tried
> both following code snipets for printing all names of files in the
> directory:
> 
> ++ snippet 1++
> 
>      for filename in glob.glob( os.path.join(r'c:\test', '*') ):
>          print filename
> 
> ++ snippet 2++
> 
>      for filename in glob.glob( os.path.join(r'c:\test.lnk', '*') ):
>          print filename


Windows shortcuts are Shell (ie GUI Desktop) objects rather
than filesystem objects. The filesystem doesn't treat them
specially; just returns the .lnk file (or whatever it's
called). You need to invoke the Shell functionality specifically.

<code>
import os, sys
import glob
import pythoncom
from win32com.shell import shell, shellcon

def shortcut_target (filename):
  shell_link = pythoncom.CoCreateInstance (
    shell.CLSID_ShellLink, 
    None,
    pythoncom.CLSCTX_INPROC_SERVER, 
    shell.IID_IShellLink
  )
  ipersist = shell_link.QueryInterface (pythoncom.IID_IPersistFile)
  ipersist.Load (filename)
  name, _ = shell_link.GetPath (1)
  return name

def shell_glob (pattern):
  for filename in glob.glob (pattern):
    if filename.endswith (".lnk"):
      yield "%s => %s" % (filename, shortcut_target (filename))
    else:
      yield filename

for filename in shell_glob ("c:/temp/*"):
  print filename

</code>

TJG


From dickinsm at gmail.com  Sat May  2 12:45:47 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 2 May 2009 09:45:47 -0700 (PDT)
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
Message-ID: <7832d72d-8e17-4662-8f24-4252c6783f46@x6g2000vbg.googlegroups.com>

On May 2, 4:12?pm, Esmail <ebo... at hotmail.com> wrote:
> Is there a Python construct to allow me to do something like
> this:
>
> ? ? for i in range(-10.5, 10.5, 0.1):
> ? ? ? ...

I'd recommend using integer arithmetic:

for ten_times_i in range(-105, 106):
    i = ten_times_i / 10.0
    ...

This has the advantage that it's clear that
you want to include the endpoint 10.5. (*Did*
you want to include the endpoint?)

Presumably you'd want the float version
to be interpreted as:

i = -10.5
while i < 10.5:
    ...
    i += 0.1

(which isn't *quite* right, because the
value of i that you end up with *after* the
while loop has run to completion is 0.1
more than the last value used within the
loop).

The big problem with this is that 0.1
is not exactly representable as a float, and
so the successive additions in the
assignment i += 0.1 are subject to
(small) rounding errors.  As a result, it's
not clear whether the value of i for the last
loop is going to be 10.4+small_error or
10.5-small_error.

Mark


From mail at timgolden.me.uk  Sat May  2 12:46:56 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Sat, 02 May 2009 17:46:56 +0100
Subject: Accessing files in a directory which is a shortcut link (Windows)
In-Reply-To: <49FC7657.1040104@timgolden.me.uk>
References: <bda7ac6d0905020916j645815car9a55b49a1a984445@mail.gmail.com>
	<49FC7657.1040104@timgolden.me.uk>
Message-ID: <49FC7900.60603@timgolden.me.uk>

Tim Golden wrote:
> Windows shortcuts are Shell (ie GUI Desktop) objects rather
> than filesystem objects. The filesystem doesn't treat them
> specially; just returns the .lnk file (or whatever it's
> called). 

As a caveat: they don't actually *have* to be called .lnk
(altho' they almost universally are). That said, I don't know
any straightforward way of otherwise distinguishing shortcut
from non-shortcut files. I think you'd just have to call
.Load on the IPersist instance and catch the E_FAIL
exception.

TJG


From ebonak at hotmail.com  Sat May  2 13:00:03 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 02 May 2009 13:00:03 -0400
Subject: for with decimal values?
In-Reply-To: <gthnsv$uil$1@ger.gmane.org>
References: <gthnsv$uil$1@ger.gmane.org>
Message-ID: <gthu6j$elj$1@ger.gmane.org>

Thanks all, I appreciate the various suggestions and
caveats. Just wanted to make sure I'm not re-inventing
the wheel as Python seems to have already so much.

Cheers,
Esmail



From Justin at EmbeddedMicro.com  Sat May  2 13:12:19 2009
From: Justin at EmbeddedMicro.com (Justin Rajewski)
Date: Sat, 02 May 2009 10:12:19 -0700
Subject: Convert variable directly into a string (no ASCII)
Message-ID: <1241284339.3478.4.camel@justin-desktop>

Hello,

I need to print variables out over serial, however I need them to not be
in ASCII, ie if the variable is 5 then print 5 not "5".

The function that writes to the serial port requires a string and I can
send non-variables out with the string "/x05" for 5.

Is this even possible?

Thanks,
Justin



From basti.wiesner at gmx.net  Sat May  2 13:35:25 2009
From: basti.wiesner at gmx.net (Sebastian Wiesner)
Date: Sat, 02 May 2009 19:35:25 +0200
Subject: Question about the wording in the python documents.
References: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
	<020b9acb$0$20667$c3e8da3@news.astraweb.com>
	<gth9um$d9i$1@hoshi.visyn.net>
	<4a751872-d92b-4b66-826e-f58a4c33bf16@v1g2000prd.googlegroups.com>
Message-ID: <gti08t$i5o$1@hoshi.visyn.net>

<grocery_stocker ? Samstag, 2. Mai 2009 17:30>

> On May 2, 4:14 am, Sebastian Wiesner <basti.wies... at gmx.net> wrote:
>> <Steven D'Aprano>>
>> > In either case, I think you're picking a nit so small that it isn't
>> > actually there. All objects are instances (in Python), and all
>> > instances are objects.
>>
>> Exactly, so strictly seen, "Request object" could possibly refer to the
>> urllib2.Request class itself.  I guess, the OP would prefer the term
>> "Request instance", emphasizing, that an instance of the request class
>> has to be passed, not he class itself.
> 
> Yes, I personally think that the term "Request instance" would have
> made it much clearer to us people that have never taken a computer
> science class in our lives.

Btw, I should have said, that I don't share your objection:  Imho you don't 
need computer science lessons, but only common sense to understand, that 
passing the class object itself doesn't really make sense in this context ;)

-- 
Freedom is always the freedom of dissenters.
                                      (Rosa Luxemburg)



From bearophileHUGS at lycos.com  Sat May  2 14:01:39 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sat, 2 May 2009 11:01:39 -0700 (PDT)
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
Message-ID: <bd847bb3-e52a-4755-8bc2-a795abfc92fc@o14g2000vbo.googlegroups.com>

Esmail:
> Is there a Python construct to allow me to do something like
> this:
> ? ? for i in range(-10.5, 10.5, 0.1):

Sometimes I use an improved version of this:
http://code.activestate.com/recipes/66472/

Bye,
bearophile


From ebonak at hotmail.com  Sat May  2 14:06:51 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 02 May 2009 14:06:51 -0400
Subject: for with decimal values?
In-Reply-To: <bd847bb3-e52a-4755-8bc2-a795abfc92fc@o14g2000vbo.googlegroups.com>
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<bd847bb3-e52a-4755-8bc2-a795abfc92fc@o14g2000vbo.googlegroups.com>
Message-ID: <gti23r$o36$1@ger.gmane.org>

bearophileHUGS at lycos.com wrote:
> Esmail:
>> Is there a Python construct to allow me to do something like
>> this:
>>     for i in range(-10.5, 10.5, 0.1):
> 
> Sometimes I use an improved version of this:
> http://code.activestate.com/recipes/66472/

neat .. lots of code to study there. Thanks,
Esmail



From nagle at animats.com  Sat May  2 14:10:32 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 02 May 2009 11:10:32 -0700
Subject: Is there any way this queue read can possibly block?
In-Reply-To: <e8c98b87-c768-4b09-b187-764c844e42e8@w35g2000prg.googlegroups.com>
References: <49f9e9c0$0$1604$742ec2ed@news.sonic.net>
	<e8c98b87-c768-4b09-b187-764c844e42e8@w35g2000prg.googlegroups.com>
Message-ID: <49fc83c4$0$1639$742ec2ed@news.sonic.net>

    That wasn't the problem.  An incoherent bug report from a user
was the problem.

				John Nagle

Carl Banks wrote:
> On Apr 30, 11:48 am, John Nagle <na... at animats.com> wrote:
>> def draininput(self) :  # consume any queued input
>>      try:
>>          while True :
>>              ch = self.inqueue.get_nowait()     # get input, if any
>>      except Queue.Empty:                                # if empty
>>          return                                 # done
>>
>> "self.inqueue" is a Queue object.  The intent here is to drain the
>> queue, then return.  Is there any way this can possibly block or hang?
> 
> Yes, but it'll be waiting to acquire the semaphore which Queues
> normally don't hold onto for long.
> 
> 
> Carl Banks
> 
>> I wouldn't think so.  Another thread is doing "put" operations,
>> but slowly, never more than 5 per second.
>>
>> (It's working for me, but a user of a program of mine is having a problem.)
>>
>>                                         John Nagle
> 


From rschroev_nospam_ml at fastmail.fm  Sat May  2 14:19:29 2009
From: rschroev_nospam_ml at fastmail.fm (Roel Schroeven)
Date: Sat, 02 May 2009 20:19:29 +0200
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <mailman.4968.1241260720.11746.python-list@python.org>
References: <200904301649.10341.kyrie@uh.cu><mailman.4899.1241167799.11746.python-list@python.org>	<2mKKl.16353$B17.1674@newsfe26.ams2>
	<mailman.4968.1241260720.11746.python-list@python.org>
Message-ID: <R80Ll.2617$_e5.314@newsfe21.ams2>

Hendrik van Rooyen schreef:
> : "Roel Schroeven" <rschroev_nospam_ml at fastmail.fm> wrote:

>> ...

> This is all true in the case of a job that starts, runs and finishes.
> I am not so sure it applies to something that has a long life.

It's true that I'm talking about work units with relatively short
lifetimes, mostly a few seconds but perhaps maximum about ten minutes. I
assumed that queues are mostly used for that kind of stuff. I've never
really thought about cases where that assumption doesn't hold, so it's
very well possible that all I've said is invalid in other cases.

>>> And if the stuff you pass around needs disparate effort to consume,
>>> it seems to me that you can more easily balance the load by having
>>> specialised consumers, instead of instances of one humungous 
>>> "I can eat anything" consumer.
>> If there is a semantic difference, maybe yes; but I think it makes no
>> sense to differentiate purely on the expected execution times.
> 
> The idea is basically that you have the code that classifies in one
> place only, instead of running in all the instances of the consumer.
> Feels better to me, somehow.

I most cases that I can imagine (and certainly in all cases I've used),
no classification whatsoever is even needed.

-- 
The saddest aspect of life right now is that science gathers knowledge
faster than society gathers wisdom.
  -- Isaac Asimov

Roel Schroeven


From apt.shansen at gmail.com  Sat May  2 14:24:15 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sat, 2 May 2009 11:24:15 -0700
Subject: Convert variable directly into a string (no ASCII)
In-Reply-To: <1241284339.3478.4.camel@justin-desktop>
References: <1241284339.3478.4.camel@justin-desktop>
Message-ID: <7a9c25c20905021124k5be73ecp3350f10be07081f8@mail.gmail.com>

> I need to print variables out over serial, however I need them to not be
> in ASCII, ie if the variable is 5 then print 5 not "5".
>
> The function that writes to the serial port requires a string and I can
> send non-variables out with the string "/x05" for 5.
>
> Is this even possible?
>

Check out the struct module.

>>> a = 5
>>> struct.pack("b", a)
'\x05'

--S
-------------- next part --------------
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From guenther.dietrich at spamfence.net  Sat May  2 14:33:25 2009
From: guenther.dietrich at spamfence.net (=?UTF-8?Q?G=C3=BCnther?= Dietrich)
Date: Sat, 02 May 2009 20:33:25 +0200
Subject: Convert variable directly into a string (no ASCII)
References: <mailman.4984.1241287107.11746.python-list@python.org>
Message-ID: <l8guc6-3e2.ln1@spamfence.net>

Justin Rajewski <Justin at EmbeddedMicro.com> wrote:

>I need to print variables out over serial, however I need them to not be
>in ASCII, ie if the variable is 5 then print 5 not "5".
>
>The function that writes to the serial port requires a string and I can
>send non-variables out with the string "/x05" for 5.

See module struct:

>>> struct.pack('b', 5)
'\x05'
>>> struct.pack('BBBB', 5, 150, 3, 224)
'\x05\x96\x03\xe0'



Regards,

G?nther


From krmane at gmail.com  Sat May  2 14:37:17 2009
From: krmane at gmail.com (Krishnakant)
Date: Sun, 03 May 2009 00:07:17 +0530
Subject: problem with money datatype based calculations in python
In-Reply-To: <20090502115734.b280bf35.darcy@druid.net>
References: <mailman.4963.1241250341.11746.python-list@python.org>
	<r8vtc6-vh1.ln1@spamfence.net>
	<20090502115734.b280bf35.darcy@druid.net>
Message-ID: <1241289437.3842.6.camel@kk-laptop>

On Sat, 2009-05-02 at 11:57 -0400, D'Arcy J.M. Cain wrote:
> And if you use PyGreSQL (http://www.PyGreSQL.org/) to connect to
> the database then the money type is already converted to Decimal.
> d'arcy, I visited the home page for pygresql and discovered that you wrote the library.
I am happy that you also included a non-dbapi (postgresql classic
interface ) along with the standard DBAPI module.

I would like to know if it has been tested with postgresql 8.3 and are
there any known bottlenecks while using this driver module on large
scale database opperations?
Is this actively maintained?
Perhaps this might be off topic but may I ask, how is pypgsql, 
>  
Has any one used pgsql for any postgresql based software?
and between pygresql and pypgsql which one is more maintained?

the system I am developing is a mission critical financial application
and I must be pritty sure about any module I am using.

happy hacking.
Krishnakant.





From martin at v.loewis.de  Sat May  2 14:41:38 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 02 May 2009 20:41:38 +0200
Subject: Convert variable directly into a string (no ASCII)
In-Reply-To: <mailman.4984.1241287107.11746.python-list@python.org>
References: <mailman.4984.1241287107.11746.python-list@python.org>
Message-ID: <49fc93e3$0$3652$9b622d9e@news.freenet.de>

> I need to print variables out over serial, however I need them to not be
> in ASCII, ie if the variable is 5 then print 5 not "5".
> 
> The function that writes to the serial port requires a string and I can
> send non-variables out with the string "/x05" for 5.
> 
> Is this even possible?

So you have a number N given, between 0 and 255, and you want to send
the byte whose ordinal is N. Right? Send chr(N).

HTH,
Martin


From doomster at knuut.de  Sat May  2 14:47:51 2009
From: doomster at knuut.de (Ulrich Eckhardt)
Date: Sat, 02 May 2009 20:47:51 +0200
Subject: Convert variable directly into a string (no ASCII)
References: <mailman.4984.1241287107.11746.python-list@python.org>
Message-ID: <763iqtF1b3p9cU1@mid.uni-berlin.de>

Justin Rajewski wrote:
> I need to print variables out over serial, however I need them to not be
> in ASCII, ie if the variable is 5 then print 5 not "5".
> 
> The function that writes to the serial port requires a string and I can
> send non-variables out with the string "/x05" for 5.

Take a look at the chr() function. For completeness, the complementary one
is ord(). However, also take a look at the 'struct' module, which is the
tool of choice if you want to do other formatting operations.

I seem to remember there was a third tool that can be used for similar
tasks, but I forgot which it was...

Uli



From jhmsmits at gmail.com  Sat May  2 14:53:17 2009
From: jhmsmits at gmail.com (SanPy)
Date: Sat, 2 May 2009 11:53:17 -0700 (PDT)
Subject: writing consecutive data to subprocess command 'more'
Message-ID: <b2ea7665-4a7e-4563-91ac-5d899e7903a3@t10g2000vbg.googlegroups.com>

I have this method that prints a given text via a subprocess command
'more' . It is like this:

def print_by_page(text):
    if hasattr(sys.stdout, 'isatty') and sys.stdout.isatty():
        viewer = 'more -EMR'
        proc = subprocess.Popen([viewer], shell=True,
stdin=subprocess.PIPE,
            stderr=subprocess.PIPE)
        try:
            stdout, stderr = proc.communicate(text)
        except OSError:
            pass
        else:
            if stderr: # probably no 'more' available on this system
                sys.stdout.write(text)
            return
    sys.stdout.write(text)

It works fine, but what I really want to do is first print a header
through the 'more' command, then fetch some data from the web, and
show it through the same 'more' command/process. And even more data,
another header, other data from the web, all through the same 'more'
command/process.
Can somebody help me out on this?

Regards,

Sander Smits


From timr at probo.com  Sat May  2 15:10:27 2009
From: timr at probo.com (Tim Roberts)
Date: Sat, 02 May 2009 12:10:27 -0700
Subject: Convert variable directly into a string (no ASCII)
References: <mailman.4984.1241287107.11746.python-list@python.org>
Message-ID: <5h6pv45424h4le90mjaoigq1cpror7tu0c@4ax.com>

Justin Rajewski <Justin at EmbeddedMicro.com> wrote:
>
>I need to print variables out over serial, however I need them to not be
>in ASCII, ie if the variable is 5 then print 5 not "5".
>
>The function that writes to the serial port requires a string and I can
>send non-variables out with the string "/x05" for 5.
>
>Is this even possible?

Of course.  The struct and array modules can help you with this.  Note that
you have to know how big each variable should be.

For example, if you want to sent 1, 2, and 3 out as bytes, you can do:

  a = 1
  b = 2
  c = 3
  serial = struct.pack( 'BBB', a, b, c )

If you need them as 16-bit ints, you can use H instead of B.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From debatem1 at gmail.com  Sat May  2 15:30:42 2009
From: debatem1 at gmail.com (CTO)
Date: Sat, 2 May 2009 12:30:42 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<mailman.4898.1241167327.11746.python-list@python.org>
	<7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
	<mailman.4921.1241190260.11746.python-list@python.org>
	<ff9a9718-73a5-45f9-8c29-512cd344ac8b@r37g2000yqn.googlegroups.com>
	<b51e6b3a-3219-4b56-9b36-6494c059c761@y10g2000prc.googlegroups.com> 
	<75e47cc6-72bc-4941-802e-767f2187445f@d7g2000prl.googlegroups.com>
Message-ID: <7744f434-dd43-4010-ba25-90096f59d1d9@n7g2000prc.googlegroups.com>

> > PS) The asizeof(obj) function from this recipe <http://
> > code.activestate.com/recipes/546530> does size the object plus its
> > references, recursively.
>
> Correction, the last sentence should be: The asizeof(obj) ... plus its
> referents, recursively.

I will admit, I have *no idea* what that code is doing, but in looking
through the gc module documentation, I'm seeing the gc.get_objects
function. Would it be equivalent to what the OP is asking to track the
size of every element returned by that?



From rpmuller at gmail.com  Sat May  2 16:11:56 2009
From: rpmuller at gmail.com (Rick)
Date: Sat, 2 May 2009 13:11:56 -0700 (PDT)
Subject: Profiling gives very different predictions of best algorithm
References: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
	<mailman.4947.1241214614.11746.python-list@python.org>
	<a6ec8b96-7374-44f0-918c-2f4940409c60@y34g2000prb.googlegroups.com>
	<mailman.4958.1241228310.11746.python-list@python.org>
	<74e32884-95b2-4e1d-9d3d-21f300bd8715@k19g2000prh.googlegroups.com>
Message-ID: <d7ce0fd6-cf1b-4195-bb5b-09d312f39ea8@u9g2000pre.googlegroups.com>

On May 2, 9:10?am, Rick <rpmul... at gmail.com> wrote:

> I was posting to the list mostly because I would like to know whether
> I can do something different when I profile my code so that it give
> results that correspond more closely to those that the nonprofiling
> results give.

A good comment that was emailed to me rather than being posted to the
list was to use cProfile rather than profile. Doing this gave much
more realistic results.


From seanm.py at gmail.com  Sat May  2 16:24:00 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Sat, 2 May 2009 13:24:00 -0700 (PDT)
Subject: Help! Can't get program to run.
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
	<mailman.4948.1241215845.11746.python-list@python.org>
Message-ID: <8f6634a2-c977-430a-b9f2-90ef9356d336@x6g2000vbg.googlegroups.com>

On May 1, 6:10?pm, Ned Deily <n... at acm.org> wrote:
> In article <7618rjF1a3t8... at mid.uni-berlin.de>,
> ?"Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
>
>
> > seanm... at gmail.com schrieb:
> > > I think this is maybe the most basic problem possible, but I can't get
> > > even the most basic Python to run on OS X using Terminal or IDLE. I
> > > used the IDLE editor to create a file with one line of code
>
> > > print 'text string'
>
> > > and I saved the file as module1.py. When using terminal I entered
> > > "python" to load the interpreter or whatever and then tried
>
> > > python module1.py
>
> > > but I got an error message. I've tried using the file path instead of
> > > module1.py and that didn't work either. I've tried moving the file to
> > > different places, my desktop, hard drive, etc., and none of that
> > > worked either. In IDLE I tried similar things and only got error
> > > messages there too.
>
> > > Needless to say this is a frustrating start to learning this langauge.
> > > I'd really appreciate any help getting this to work, so I can move on
> > > the actual language. Thanks so much.
>
> > It would have helped if you had given us the *actual* error-message.
> > ?From what little information you give, it appears as if you do
> > something very basic wrong - instead of doing
> > $ python
> > ?>>> python mymodule.py
> > (where $ is the shell/terminal and >>> the python-prompt)
> > you either do
> > $ python
> > ?>>> print "hello"
> > or
> > $ python mymodule.py
> > to execute mymodule directly.
>
> And from within OS X IDLE itself, if you create or open the file
> mymodule.py, it will be in a separate window and, as long as that window
> is selected, you can run the file directly within IDLE by selecting "Run
> Module" from the "Run" menu. ? So, no need to use the Terminal if you
> don't want to.
>
> --
> ?Ned Deily,
> ?n... at acm.org

Thank you for both for the help. I still cannot get the program to run
though. Below I've copied my commands and the error messages for you
(in IDLE then Terminal):

IDLE 2.6.2
>>> python module1.py
SyntaxError: invalid syntax

and

sean-marimpietris-computer:~ seanmarimpietri$ python
Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
[GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> python module1.py
  File "<stdin>", line 1
    python module1.py
                 ^
SyntaxError: invalid syntax



Again, any help would be appreciated. Thanks.


From arnodel at googlemail.com  Sat May  2 16:30:16 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 02 May 2009 21:30:16 +0100
Subject: Help! Can't get program to run.
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
	<mailman.4948.1241215845.11746.python-list@python.org>
	<8f6634a2-c977-430a-b9f2-90ef9356d336@x6g2000vbg.googlegroups.com>
Message-ID: <m2fxfn459j.fsf@googlemail.com>

seanm.py at gmail.com writes:

> sean-marimpietris-computer:~ seanmarimpietri$ python
> Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> python module1.py
>   File "<stdin>", line 1
>     python module1.py
>                  ^
> SyntaxError: invalid syntax
>
>
>
> Again, any help would be appreciated. Thanks.

>From Terminal.app, this should work:

sean-marimpietris-computer:~ seanmarimpietri$ python module1.py

Assuming that your module1.py file is in /Users/seanmarimpietri/

-- 
Arnaud


From gagsl-py2 at yahoo.com.ar  Sat May  2 16:35:19 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 02 May 2009 17:35:19 -0300
Subject: writing consecutive data to subprocess command 'more'
References: <b2ea7665-4a7e-4563-91ac-5d899e7903a3@t10g2000vbg.googlegroups.com>
Message-ID: <op.utbks5scx6zn5v@gabriel.sleipnir-bsas>

En Sat, 02 May 2009 15:53:17 -0300, SanPy <jhmsmits at gmail.com> escribi?:

> I have this method that prints a given text via a subprocess command
> 'more' . It is like this:
>
> def print_by_page(text):
>     if hasattr(sys.stdout, 'isatty') and sys.stdout.isatty():
>         viewer = 'more -EMR'
>         proc = subprocess.Popen([viewer], shell=True,
> stdin=subprocess.PIPE,
>             stderr=subprocess.PIPE)
>         try:
>             stdout, stderr = proc.communicate(text)
>         except OSError:
>             pass
>         else:
>             if stderr: # probably no 'more' available on this system
>                 sys.stdout.write(text)
>             return
>     sys.stdout.write(text)
>
> It works fine, but what I really want to do is first print a header
> through the 'more' command, then fetch some data from the web, and
> show it through the same 'more' command/process. And even more data,
> another header, other data from the web, all through the same 'more'
> command/process.
> Can somebody help me out on this?

communicate writes to the child's stdin and waits for it to finish. If you  
want to keep writing, don't use communicate. And you'll need to keep state  
 from one call to another, so use a class. Based on the code above, create  
a class Pager with __init__, write and close methods:

class Pager:
  def __init__(self):
   # copy the logic above
   self.proc = subprocess.Popen(...)
   self.file = self.proc.stdin
   # if something goes wrong, set self.proc=None and self.file=sys.stdout

  def write(self, text):
   self.file.write(text)

  def close(self):
   if self.proc:
    self.file.close()
    self.proc.wait()

Also, take a look at the pager function in the pydoc module (see the  
source) - it handles several cases.

-- 
Gabriel Genellina



From seanm.py at gmail.com  Sat May  2 16:36:00 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Sat, 2 May 2009 13:36:00 -0700 (PDT)
Subject: Most Basic Question Ever - please help
Message-ID: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>

I am going to try posting here again with more detail to see if I can
finally get my first program to work.

I am working on a MacBook Pro with OS X 10.4.11. I opened a new window
in IDLE to create a file. The file had only one line of code and was
saved as module1.py. I saved it to Macintosh HD. The one line of code
in the file is copied below:

print 'Hello module world!'

I closed the file and tried to run it in IDLE and Terminal, but I have
had no success. I'll paste my commands and the error messages below
(for IDLE, then Terminal). Any help would be very much appreciated. I
feel like the marathon just started and I've fallen flat on my face.
Thanks.

IDLE 2.6.2
>>> python module1.py
SyntaxError: invalid syntax


sean-m-computer:~ seanm$ python
Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
[GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> python module1.py
  File "<stdin>", line 1
    python module1.py
                 ^
SyntaxError: invalid syntax






From piet at cs.uu.nl  Sat May  2 16:37:24 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 02 May 2009 22:37:24 +0200
Subject: writing consecutive data to subprocess command 'more'
References: <b2ea7665-4a7e-4563-91ac-5d899e7903a3@t10g2000vbg.googlegroups.com>
Message-ID: <m2fxfnp7gb.fsf@cs.uu.nl>

>>>>> SanPy <jhmsmits at gmail.com> (S) wrote:

>S> I have this method that prints a given text via a subprocess command
>S> 'more' . It is like this:

>S> def print_by_page(text):
>S>     if hasattr(sys.stdout, 'isatty') and sys.stdout.isatty():
>S>         viewer = 'more -EMR'
>S>         proc = subprocess.Popen([viewer], shell=True,
>S> stdin=subprocess.PIPE,
>S>             stderr=subprocess.PIPE)
>S>         try:
>S>             stdout, stderr = proc.communicate(text)
>S>         except OSError:
>S>             pass
>S>         else:
>S>             if stderr: # probably no 'more' available on this system
>S>                 sys.stdout.write(text)
>S>             return
>S>     sys.stdout.write(text)

>S> It works fine, but what I really want to do is first print a header
>S> through the 'more' command, then fetch some data from the web, and
>S> show it through the same 'more' command/process. And even more data,
>S> another header, other data from the web, all through the same 'more'
>S> command/process.
>S> Can somebody help me out on this?

You have to split this. Do the startup (creating the subprocess) once,
and then for each piece of text that you want to pass through 'more' do
stdout, stderr = proc.communicate(text)

By the way, in this last line, stdout should come out empty because the
output of more doesn't come back to the parent process, but goes to the
original stdout of the calling script.

Also I would use the following:
    viewer = ['more', '-EMR']
    proc = subprocess.Popen(viewer, stdin=subprocess.PIPE, 
                                    stderr=subprocess.PIPE)
No reason to use a shell.

And if there is no 'more' available you get an exception on the Popen
already. You don't have to wait until the communicate call.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From seanm.py at gmail.com  Sat May  2 16:42:03 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Sat, 2 May 2009 13:42:03 -0700 (PDT)
Subject: Help! Can't get program to run.
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
	<mailman.4948.1241215845.11746.python-list@python.org> 
	<8f6634a2-c977-430a-b9f2-90ef9356d336@x6g2000vbg.googlegroups.com> 
	<m2fxfn459j.fsf@googlemail.com>
Message-ID: <02786fbc-c881-4f68-9877-c662d6362b8e@s31g2000vbp.googlegroups.com>

On May 2, 4:30?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
> seanm... at gmail.com writes:
> > sean-marimpietris-computer:~ seanmarimpietri$ python
> > Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> > [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> > Type "help", "copyright", "credits" or "license" for more information.
> >>>> python module1.py
> > ? File "<stdin>", line 1
> > ? ? python module1.py
> > ? ? ? ? ? ? ? ? ?^
> > SyntaxError: invalid syntax
>
> > Again, any help would be appreciated. Thanks.
>
> From Terminal.app, this should work:
>
> sean-marimpietris-computer:~ seanmarimpietri$ python module1.py
>
> Assuming that your module1.py file is in /Users/seanmarimpietri/
>
> --
> Arnaud

Awesome. Thank you, Arnaud. I moved the file to that folder, and I got
it to work in Terminal. However, I still can't get it to run using
IDLE. Any idea why that might be? Thanks again. -Sean


From bvidinli at gmail.com  Sat May  2 16:42:31 2009
From: bvidinli at gmail.com (bvidinli)
Date: Sat, 2 May 2009 23:42:31 +0300
Subject: eric not working on ubuntu 9.04
Message-ID: <36e8a7020905021342g64efbe30l36230bb0df407ffe@mail.gmail.com>

any idea ?
here is output:

bvidinli at bvidinli-yenihdd:~$ eric
Warning: translation file 'qt_tr_TR'could not be loaded.
Using default.
Warning: translation file 'qscintilla_tr_TR'could not be loaded.
Using default.
Exception RuntimeError: 'maximum recursion depth exceeded while
calling a Python object' in <type 'exceptions.AttributeError'> ignored
Exception RuntimeError: 'maximum recursion depth exceeded in
__subclasscheck__' in <type 'exceptions.AttributeError'> ignored
An unhandled exception occurred. Please report the problem
using the error reporting dialog or via email to <eric4-bugs at die-offenbachs.de>.
A log has been written to "/home/bvidinli/.eric4/eric4_error.log".

Error information:
--------------------------------------------------------------------------------
2009-05-02, 23:42:05
--------------------------------------------------------------------------------
<type 'exceptions.ImportError'>:
cannot import name walk
--------------------------------------------------------------------------------
  File "/usr/share/eric/modules/eric4.py", line 250, in <module>
    main()
  File "/usr/share/eric/modules/eric4.py", line 229, in main
    from UI.UserInterface import UserInterface
  File "/usr/share/eric/modules/UI/UserInterface.py", line 66, in <module>
    from EmailDialog import EmailDialog
  File "/usr/share/eric/modules/UI/EmailDialog.py", line 28, in <module>
    from email.MIMEBase import MIMEBase
  File "/usr/lib/python2.6/email/__init__.py", line 79, in __getattr__
    __import__(self.__name__)
  File "/usr/lib/python2.6/email/mime/base.py", line 9, in <module>
    from email import message
  File "/usr/lib/python2.6/email/message.py", line 90, in <module>
    class Message:
  File "/usr/lib/python2.6/email/message.py", line 790, in Message
    from email.Iterators import walk

--------------------------------------------------------------------------------
Version Numbers:
  Python 2.6.2
  KDE 4.2.2
  PyKDE 4.0.2
  Qt 4.5.0
  PyQt4 4.4.4
  sip sip version not available
  QScintilla 2.3.2
  eric4 4.3.0 (r2852)

Platform: linux2
2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
[GCC 4.3.3]
--------------------------------------------------------------------------------
Distribution Info:
  /etc/lsb-release
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=9.04
  DISTRIB_CODENAME=jaunty
  DISTRIB_DESCRIPTION="Ubuntu 9.04"
bvidinli at bvidinli-yenihdd:~$


From gert.cuykens at gmail.com  Sat May  2 16:44:58 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 2 May 2009 13:44:58 -0700 (PDT)
Subject: return functions
Message-ID: <f6a8cbe2-2078-4e0a-8b52-6437b440d18d@o30g2000vbc.googlegroups.com>

Aldo i like the cerrypy wsgi server very much, i do not like the tools
that go with it
so i am stuck with a configuration file that looks like this

http://pastebin.com/m4d8184bc

After 152 line I finally arrived to a point where i was thinkig "thats
it, this is like going to work on a uni cycle and is just plain
ridicules"

So how can i generate some functions something like

def generate(url,type): # where type could be htm js css or wsgi


From davea at ieee.org  Sat May  2 16:46:16 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 02 May 2009 16:46:16 -0400
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <49FCAFAC.40800@ieee.org>
References: <200904301649.10341.kyrie@uh.cu><mailman.4899.1241167799.11746.python-list@python.org>	<2mKKl.16353$B17.1674@newsfe26.ams2>
	<00a601c9cb12$152d25e0$0d00a8c0@Hendrik> <49FCAFAC.40800@ieee.org>
Message-ID: <49FCB118.3010908@ieee.org>

Hendrik van Rooyen wrote:
> : "Roel Schroeven" <rschroev_nospam_ml at fastmail.fm> wrote:
>
>
>  
>> Hendrik van Rooyen schreef:
>>    
>>> I have always wondered why people do the one queue many getters thing.
>>>       
>> Because IMO it's the simplest and most elegant solution.
>>     
>
> That is fair enough...
>
>  
>>> Given that the stuff you pass is homogenous in that it will require a
>>> similar amount of effort to process, is there not a case to be made
>>> to have as many queues as consumers, and to round robin the work?
>>>       
>> Could work if the processing time for each work unit is exactly the same
>> (otherwise one or more consumers will be idle part of the time), but in
>> most cases that is not guaranteed. A simple example is fetching data
>> over the network: even if the data size is always the same, there will
>> be differences because of network load variations.
>>
>> If you use one queue, each consumer fetches a new work unit as soon it
>> has consumed the previous one. All consumers will be working as long as
>> there is work to do, without having to write any code to do the load
>> balancing.
>>
>> With one queue for each consumer, you either have to assume that the
>> average processing time is the same (otherwise some consumers will be
>> idle at the end, while others are still busy processing work units), or
>> you need some clever code in the producer(s) or the driving code to
>> balance the loads. That's extra complexity for little or no benefit.
>>
>> I like the simplicity of having one queue: the producer(s) put work
>> units on the queue with no concern which consumer will process them or
>> how many consumers there even are; likewise the consumer(s) don't know
>> and don't need to know where their work units come from. And the work
>> gets automatically distributed to whichever consumer has first finished
>> its previous work unit.
>>     
>
> This is all true in the case of a job that starts, runs and finishes.
> I am not so sure it applies to something that has a long life.
>
>  
>>> And if the stuff you pass around needs disparate effort to consume,
>>> it seems to me that you can more easily balance the load by having
>>> specialised consumers, instead of instances of one humungous "I can 
>>> eat anything" consumer.
>>>       
>> If there is a semantic difference, maybe yes; but I think it makes no
>> sense to differentiate purely on the expected execution times.
>>     
>
> The idea is basically that you have the code that classifies in one
> place only, instead of running in all the instances of the consumer.
> Feels better to me, somehow.
>   <snip>
If the classifying you're doing is just based on expected time to 
consume the item, then I think your plan to use separate queues is 
misguided.

If the consumers are interchangeable in their abilities, then feeding 
them from a single queue is more efficient, both on average wait time, 
worst-case wait time, and on consumer utilization, in nearly all 
non-pathological scenarios.  Think the line at the bank.  There's a good 
reason they now have a single line for multiple tellers.  If you have 
five tellers, and one of your transactions is really slow, the rest of 
the line is only slowed down by 20%, rather than a few people being 
slowed down by a substantial amount because they happen to be behind the 
slowpoke.  30 years ago, they'd have individual lines, and I tried in 
vain to explain queuing theory to the bank manager.

Having said that, notice that sometimes the consumers in a computer are 
not independent.  If you're running 20 threads with this model, on a 
processor with only two cores, and if the tasks are CPU bound, you're 
wasting lots of thread-management time without gaining anything.  
Similarly, if there are other shared resources that all the threads trip 
over, it may not pay to do as many of them in parallel.  But for 
homogeneous consumers, do them with a single queue, and do benchmarks to 
determine the optimum number of consumers to start.



From gert.cuykens at gmail.com  Sat May  2 16:58:10 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 2 May 2009 13:58:10 -0700 (PDT)
Subject: return functions
References: <f6a8cbe2-2078-4e0a-8b52-6437b440d18d@o30g2000vbc.googlegroups.com>
Message-ID: <2b9deb7a-327d-40b2-8df9-d6db916a6bab@s28g2000vbp.googlegroups.com>

On May 2, 10:44?pm, gert <gert.cuyk... at gmail.com> wrote:
> Aldo i like the cerrypy wsgi server very much, i do not like the tools
> that go with it
> so i am stuck with a configuration file that looks like this
>
> http://pastebin.com/m4d8184bc
>
> After 152 line I finally arrived to a point where i was thinkig "thats
> it, this is like going to work on a uni cycle and is just plain
> ridicules"
>
> So how can i generate some functions something like
>
> def generate(url,type): # where type could be htm js css or wsgi

I was thinking something like this ?

def static(url, mime):
    def application(environ, response):
        f=open(os.path.join(os.path.dirname(__file__), url),'rb')
        l=os.fstat(f.fileno()).st_size
        response('200 OK', [('Content-type', mime+';charset=utf-8'),
('Content-Length', str(l))])
        return FileWrapper(f, 8192)
    return application


From jhmsmits at gmail.com  Sat May  2 17:00:44 2009
From: jhmsmits at gmail.com (SanPy)
Date: Sat, 2 May 2009 14:00:44 -0700 (PDT)
Subject: writing consecutive data to subprocess command 'more'
References: <b2ea7665-4a7e-4563-91ac-5d899e7903a3@t10g2000vbg.googlegroups.com>
	<mailman.4988.1241296526.11746.python-list@python.org>
Message-ID: <c9776d62-5d87-4f6c-b002-3690c6e21e87@t11g2000vbc.googlegroups.com>

Thanks, that works beautifully!

Regards,
Sander

On 2 mei, 22:35, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Sat, 02 May 2009 15:53:17 -0300, SanPy <jhmsm... at gmail.com> escribi?:
>
>
>
>
>
> > I have this method that prints a given text via a subprocess command
> > 'more' . It is like this:
>
> > def print_by_page(text):
> > ? ? if hasattr(sys.stdout, 'isatty') and sys.stdout.isatty():
> > ? ? ? ? viewer = 'more -EMR'
> > ? ? ? ? proc = subprocess.Popen([viewer], shell=True,
> > stdin=subprocess.PIPE,
> > ? ? ? ? ? ? stderr=subprocess.PIPE)
> > ? ? ? ? try:
> > ? ? ? ? ? ? stdout, stderr = proc.communicate(text)
> > ? ? ? ? except OSError:
> > ? ? ? ? ? ? pass
> > ? ? ? ? else:
> > ? ? ? ? ? ? if stderr: # probably no 'more' available on this system
> > ? ? ? ? ? ? ? ? sys.stdout.write(text)
> > ? ? ? ? ? ? return
> > ? ? sys.stdout.write(text)
>
> > It works fine, but what I really want to do is first print a header
> > through the 'more' command, then fetch some data from the web, and
> > show it through the same 'more' command/process. And even more data,
> > another header, other data from the web, all through the same 'more'
> > command/process.
> > Can somebody help me out on this?
>
> communicate writes to the child's stdin and waits for it to finish. If you ?
> want to keep writing, don't use communicate. And you'll need to keep state ?
> ?from one call to another, so use a class. Based on the code above, create ?
> a class Pager with __init__, write and close methods:
>
> class Pager:
> ? def __init__(self):
> ? ?# copy the logic above
> ? ?self.proc = subprocess.Popen(...)
> ? ?self.file = self.proc.stdin
> ? ?# if something goes wrong, set self.proc=None and self.file=sys.stdout
>
> ? def write(self, text):
> ? ?self.file.write(text)
>
> ? def close(self):
> ? ?if self.proc:
> ? ? self.file.close()
> ? ? self.proc.wait()
>
> Also, take a look at the pager function in the pydoc module (see the ?
> source) - it handles several cases.
>
> --
> Gabriel Genellina



From rhodri at wildebst.demon.co.uk  Sat May  2 17:21:15 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 02 May 2009 22:21:15 +0100
Subject: Help! Can't get program to run.
In-Reply-To: <02786fbc-c881-4f68-9877-c662d6362b8e@s31g2000vbp.googlegroups.com>
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
	<mailman.4948.1241215845.11746.python-list@python.org>
	<8f6634a2-c977-430a-b9f2-90ef9356d336@x6g2000vbg.googlegroups.com>
	<m2fxfn459j.fsf@googlemail.com>
	<02786fbc-c881-4f68-9877-c662d6362b8e@s31g2000vbp.googlegroups.com>
Message-ID: <op.utbmxphda8ncjz@gnudebst>

On Sat, 02 May 2009 21:42:03 +0100, <seanm.py at gmail.com> wrote:

> Awesome. Thank you, Arnaud. I moved the file to that folder, and I got
> it to work in Terminal. However, I still can't get it to run using
> IDLE. Any idea why that might be? Thanks again. -Sean

To repeat what you were told earlier, IDLE is an interactive Python
shell, not a command line.  It executes Python commands directly, like

>>> print "Hello, world"

"python mymodule.py" is *not* a Python command.

To run your script from within IDLE, you have two choices: either
open the script to edit with IDLE (menu File->Open or Ctrl-O) and
use menu Run->Run Module or F5 to run it; or (assuming mymodule.py
is in your home directory) type

>>> import mymodule

The former has a few gotchas that you probably won't hit, and the
latter has several that you almost certainly will hit.  Personally
I'd stick with the command line that you've already succeeded with!

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From nad at acm.org  Sat May  2 17:30:40 2009
From: nad at acm.org (Ned Deily)
Date: Sat, 02 May 2009 14:30:40 -0700
Subject: Help! Can't get program to run.
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
	<mailman.4948.1241215845.11746.python-list@python.org>
	<8f6634a2-c977-430a-b9f2-90ef9356d336@x6g2000vbg.googlegroups.com>
Message-ID: <nad-4A0564.14304002052009@news.gmane.org>

In article 
<8f6634a2-c977-430a-b9f2-90ef9356d336 at x6g2000vbg.googlegroups.com>,
 seanm.py at gmail.com wrote:
> Thank you for both for the help. I still cannot get the program to run
> though. Below I've copied my commands and the error messages for you
> (in IDLE then Terminal):
> 
> IDLE 2.6.2
> >>> python module1.py
> SyntaxError: invalid syntax

The default IDLE window is a python shell window.  That is, you are 
already "inside" the python interpreter, the same as if you typed just 
"python", with no file name, in the Terminal window.  You can use that 
to execute python statements and introspect objects, among other things.  
Try it.

But, back in IDLE, ignore that window for the moment and use the Open 
command in the File Menu to select and open your file module1.py from 
whatever directory it is in.  A new window should open with the contents 
of that file.  With that window selected (click on it, if necessary), 
there should be a "Run" option in the Menu bar and under it will be a 
"Run Script" option that will cause the script to run and the output to 
appear in the shell window.  You can then explore the other options 
available in IDLE for debugging, etc.

-- 
 Ned Deily,
 nad at acm.org



From mike.blonder at gmail.com  Sat May  2 17:40:34 2009
From: mike.blonder at gmail.com (mikefromvt)
Date: Sat, 2 May 2009 14:40:34 -0700 (PDT)
Subject: Need Help with str.replace & tuples
Message-ID: <90983bf0-c21d-44f5-91c1-873c484678b9@s16g2000vbp.googlegroups.com>

Hello.

I am very very unfamiliar with Python and need to update a Python
script.  What I need to do is to replace three variables (already
defined in the script) within a string.  The present script correctly
replaces two of the three variables.  I am unable to add a third
variable.  Specifically, I would like to add

"panoble",panoble

to the following code:

idxItemStr+=string.replace(string.replace
(idxItemTplStr,"stylenumber",stylenumber),"formalname",formalname)

and, specifically as regards

idxItemTplStr

Is this possible?

Thanks

Mike




From apt.shansen at gmail.com  Sat May  2 17:44:43 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sat, 2 May 2009 14:44:43 -0700
Subject: Most Basic Question Ever - please help
In-Reply-To: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
References: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
Message-ID: <7a9c25c20905021444x620ed83cmf95d0381df185712@mail.gmail.com>

>
> IDLE 2.6.2
> >>> python module1.py
> SyntaxError: invalid syntax
>

The ">>>" prompt is Python's interactive interpreter. Once you are here, you
already are in python-- so typing "python" again is redundant and invalid.
>From this prompt you type in python code.

I have never used IDLE so can't comment on how to get it to run modules and
collect output-- but I suspect when your file is open in IDLE there's a menu
option that says something about Run.

But....


> sean-m-computer:~ seanm$ python
> Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> python module1.py
>  File "<stdin>", line 1
>    python module1.py
>                 ^
> SyntaxError: invalid syntax
>

Same thing. You're starting python: then doing 'python module1.py' within
Python, which doesn't make sense. If you want Python to run the module, just
do "python module1.py" instead of "python" from your command prompt.

--S
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From davea at ieee.org  Sat May  2 17:46:15 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 02 May 2009 17:46:15 -0400
Subject: Most Basic Question Ever - please help
In-Reply-To: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
References: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
Message-ID: <49FCBF27.5060103@ieee.org>

seanm.py at gmail.com wrote:
> I am going to try posting here again with more detail to see if I can
> finally get my first program to work.
>
> I am working on a MacBook Pro with OS X 10.4.11. I opened a new window
> in IDLE to create a file. The file had only one line of code and was
> saved as module1.py. I saved it to Macintosh HD. The one line of code
> in the file is copied below:
>
> print 'Hello module world!'
>
> I closed the file and tried to run it in IDLE and Terminal, but I have
> had no success. I'll paste my commands and the error messages below
> (for IDLE, then Terminal). Any help would be very much appreciated. I
> feel like the marathon just started and I've fallen flat on my face.
> Thanks.
>
> IDLE 2.6.2
>   
>>>> python module1.py
>>>>         
> SyntaxError: invalid syntax
>
>
> sean-m-computer:~ seanm$ python
> Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>   
>>>> python module1.py
>>>>         
>   File "<stdin>", line 1
>     python module1.py
>                  ^
> SyntaxError: invalid syntax
>
>
>   
In both cases, you're already running python.  Why would you expect to 
have to run python inside python?

Once you're at a python prompt (in either of your cases), you use the 
command "import" to load a module.  And you do not put the ".py" 
extension on the parameter.  Specifically, it should look like this, and 
very similar for IDLE.

M:\Programming\Python\sources\temp>c:\ProgFiles\Python26\python.exe
Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit 
(Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
 >>> import module1
Hello module world!
 >>>

>
>   


From bearophileHUGS at lycos.com  Sat May  2 18:12:36 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sat, 2 May 2009 15:12:36 -0700 (PDT)
Subject: Dictionary, integer compression
References: <c9dd453d-e3ca-4cc5-9013-5059ce9298ef@f1g2000prb.googlegroups.com>
	<368d63c2-0467-4c3e-a623-2a39ef3d92c7@r31g2000prh.googlegroups.com> 
	<bd82431c-c271-4481-8c35-7d27e59fba56@s38g2000prg.googlegroups.com> 
	<20dee642-fbfa-4c9f-a182-7319077298e5@t36g2000prt.googlegroups.com> 
	<aea63855-72a3-4c0f-948c-bc4f97064ba5@k19g2000prh.googlegroups.com>
Message-ID: <5fe34cf2-e56c-4ed2-a2fd-7c2fc7d5efcc@o27g2000vbd.googlegroups.com>

dineshv:
> Thanks for that about Python3. ?My integers range from 0 to 9,999,999
> and I have loads of them. ?Do you think Python3 will help?

Nope.
Bye,
bearophile


From gert.cuykens at gmail.com  Sat May  2 18:17:54 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 2 May 2009 15:17:54 -0700 (PDT)
Subject: return functions
References: <f6a8cbe2-2078-4e0a-8b52-6437b440d18d@o30g2000vbc.googlegroups.com>
	<2b9deb7a-327d-40b2-8df9-d6db916a6bab@s28g2000vbp.googlegroups.com>
Message-ID: <0b04c45d-0152-4498-a331-a19452c29b2f@l28g2000vba.googlegroups.com>

On May 2, 10:58?pm, gert <gert.cuyk... at gmail.com> wrote:
> On May 2, 10:44?pm, gert <gert.cuyk... at gmail.com> wrote:
>
> > Aldo i like the cerrypy wsgi server very much, i do not like the tools
> > that go with it
> > so i am stuck with a configuration file that looks like this
>
> >http://pastebin.com/m4d8184bc
>
> > After 152 line I finally arrived to a point where i was thinkig "thats
> > it, this is like going to work on a uni cycle and is just plain
> > ridicules"
>
> > So how can i generate some functions something like
>
> > def generate(url,type): # where type could be htm js css or wsgi
>
> I was thinking something like this ?
>
> def static(url, mime):
> ? ? def application(environ, response):
> ? ? ? ? f=open(os.path.join(os.path.dirname(__file__), url),'rb')
> ? ? ? ? l=os.fstat(f.fileno()).st_size
> ? ? ? ? response('200 OK', [('Content-type', mime+';charset=utf-8'),
> ('Content-Length', str(l))])
> ? ? ? ? return FileWrapper(f, 8192)
> ? ? return application

it works, i reduced it to this :-)

http://code.google.com/p/appwsgi/source/browse/trunk/server.py

any other suggestions to make it smaller and more automatic ?



From bearophileHUGS at lycos.com  Sat May  2 18:22:34 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sat, 2 May 2009 15:22:34 -0700 (PDT)
Subject: Need Help with str.replace & tuples
References: <90983bf0-c21d-44f5-91c1-873c484678b9@s16g2000vbp.googlegroups.com>
Message-ID: <f1ad962b-5777-46cb-8f96-277ea51aba3c@t10g2000vbg.googlegroups.com>

mikefromvt:
> I am very very unfamiliar with Python and need to update a Python
> script. ?What I need to do is to replace three variables (already
> defined in the script) within a string. ?The present script correctly
> replaces two of the three variables. ?I am unable to add a third
> variable. ?Specifically, I would like to add
>
> "panoble",panoble
> to the following code:
> idxItemStr+=string.replace(string.replace
(idxItemTplStr,"stylenumber",stylenumber),"formalname",formalname)

This isn't going to win some contest of coding style quality, but you
may try this (for other people: I have not added any new variable name
on purpose):

idxItemStr += idxItemTplStr.replace("stylenumber",
              stylenumber).replace("formalname",
              formalname).replace("panoble", panoble)

Note that in Python names are usually written like this:
idx_item_tpl
Instead of:
idxItemTplStr

Bye,
bearophile


From sjmachin at lexicon.net  Sat May  2 18:25:26 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 2 May 2009 15:25:26 -0700 (PDT)
Subject: Most Basic Question Ever - please help
References: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
	<mailman.4994.1241300789.11746.python-list@python.org>
Message-ID: <0b10f7fd-9b08-40d4-8395-83bdfe860f90@v23g2000pro.googlegroups.com>

On May 3, 7:46?am, Dave Angel <da... at ieee.org> wrote:
> seanm... at gmail.com wrote:
> > I am going to try posting here again with more detail to see if I can
> > finally get my first program to work.
>
> > I am working on a MacBook Pro with OS X 10.4.11. I opened a new window
> > in IDLE to create a file. The file had only one line of code and was
> > saved as module1.py. I saved it to Macintosh HD. The one line of code
> > in the file is copied below:
>
> > print 'Hello module world!'
>
> > I closed the file and tried to run it in IDLE and Terminal, but I have
> > had no success. I'll paste my commands and the error messages below
> > (for IDLE, then Terminal). Any help would be very much appreciated. I
> > feel like the marathon just started and I've fallen flat on my face.
> > Thanks.
>
> > IDLE 2.6.2
>
> >>>> python module1.py
>
> > SyntaxError: invalid syntax
>
> > sean-m-computer:~ seanm$ python
> > Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> > [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> > Type "help", "copyright", "credits" or "license" for more information.
>
> >>>> python module1.py
>
> > ? File "<stdin>", line 1
> > ? ? python module1.py
> > ? ? ? ? ? ? ? ? ?^
> > SyntaxError: invalid syntax
>
> In both cases, you're already running python. ?Why would you expect to
> have to run python inside python?
>
> Once you're at a python prompt (in either of your cases), you use the
> command "import" to load a module. ?And you do not put the ".py"
> extension on the parameter. ?Specifically, it should look like this, and
> very similar for IDLE.
>
> M:\Programming\Python\sources\temp>c:\ProgFiles\Python26\python.exe
> Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit
> (Intel)] on
> win32
> Type "help", "copyright", "credits" or "license" for more information.
> ?>>> import module1
> Hello module world!
> ?>>>

Dave, importing modules which have side effects like printing is NOT a
good habit to which a beginner should be introduced. He needs to know
how to run a script.

Sean, in Terminal, instead of typing
    python
type
    python module1.py

and I suggest that you give your script (not module) a more meaningful
name.

HTH,
John


From sjmachin at lexicon.net  Sat May  2 18:45:31 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 2 May 2009 15:45:31 -0700 (PDT)
Subject: problem with money datatype based calculations in python
References: <1241250322.4669.13.camel@kk-laptop>
	<mailman.4973.1241273412.11746.python-list@python.org>
Message-ID: <aff9d3d3-b38e-4fd0-b621-e05b2b4217c4@w35g2000prg.googlegroups.com>

On May 3, 12:09?am, Dave Angel <da... at ieee.org> wrote:
> Krishnakant wrote:
> > hello all,
> > I am using postgresql as a database server for my db application.
>
> > The database is related to accounts and point of sales and many
> > calculations involve money datatype.
>
> > The application logic is totally done in python. ?Now the problem is
> > that there is a situation where we calculate tax on % of the total
> > amount on the invoice. ?The ?percentage is in terms of float but the
> > eventual amount has to be in a money datatype.
>
> > The product cost comes in money datatype from postgresql and the tax %
> > comes in float. ?So I would like to know if python supports some thing
> > similar to money datatype so that I can cast my total amount (in money )
> > divided by tax% (in float ) so money divided by float should be the
> > result and that result should be in money datatype.
> > For example a product x has the cost Rs. 100 which is stored in the
> > tabel as money type. ?and in the tax table for that product the VAT is
> > 5% and this 5% is stored in float datatype. ?So after using both these
> > values the resulting total 105Rs. should be in money type and not float.
> > I awaite some reply,
> > Thanks in advice.
> > happy hacking.
> > Krishnakant.
>
> Tax rate isn't divided, it's multiplied. ?But probably that's just a
> typo in your message.
>
> Short answer is use your money class to convert the float into money. ?
> And then test, to see that's really what you wanted. ?Be sure and check
> the edge cases, because float is a binary system, and you can get both
> quantization and rounding problems converting between them.
>
> Is the money you're dealing with decimal-based? ?So maybe money values
> are integers plus two more digits of fractional precision?
>
> It's going to be tough for somebody with no access to that "money type"
> to guess what your problem is. ?What operations does it currently
> support? ?If it supports multiply, then just change the tax rate to be a
> money type.

Aarrgghh!! If the "money type" supports multiplying money by money,
the author should be put in the stocks and pelted with rotten
vegetables.

(IMHO)



From ben+python at benfinney.id.au  Sat May  2 19:48:34 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 03 May 2009 09:48:34 +1000
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
Message-ID: <8763gjm5gt.fsf@benfinney.id.au>

Esmail <ebonak at hotmail.com> writes:

> Hello all,
> 
> Is there a Python construct to allow me to do something like
> this:
> 
>    for i in range(-10.5, 10.5, 0.1):
>      ...

Note that those values are of type ?float?, which is a distinct type
from ?Decimal? with very different behaviour.

> If there is such a thing already available, I'd like to use it,
> otherwise I can write a function to mimic this, but I thought I'd
> check (my search yielded nothing).

You can write a function to do it.

Alternatively, this case seems simple enough that you can write a
generator expression. Assuming you want ?Decimal? values:

    >>> from decimal import Decimal
    >>> amounts = (Decimal(mantissa)/10 for mantissa in range(-105, 105))
    >>> for amount in amounts:
    ...     print amount
    ...
    -10.5
    -10.4
    -10.3
    -10.2
    -10.1
    -10
    -9.9
    ?
    9.6
    9.7
    9.8
    9.9
    10
    10.1
    10.2
    10.3
    10.4

-- 
 \      ?I have a large seashell collection, which I keep scattered on |
  `\    the beaches all over the world. Maybe you've seen it.? ?Steven |
_o__)                                                           Wright |
Ben Finney


From seanm.py at gmail.com  Sat May  2 20:08:07 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Sat, 2 May 2009 17:08:07 -0700 (PDT)
Subject: Help! Can't get program to run.
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
	<mailman.4948.1241215845.11746.python-list@python.org> 
	<8f6634a2-c977-430a-b9f2-90ef9356d336@x6g2000vbg.googlegroups.com> 
	<mailman.4992.1241299856.11746.python-list@python.org>
Message-ID: <85d158e7-6d31-46ca-8c61-85d422a16087@21g2000vbk.googlegroups.com>

On May 2, 5:30?pm, Ned Deily <n... at acm.org> wrote:
> In article
> <8f6634a2-c977-430a-b9f2-90ef9356d... at x6g2000vbg.googlegroups.com>,
>
> ?seanm... at gmail.com wrote:
> > Thank you for both for the help. I still cannot get the program to run
> > though. Below I've copied my commands and the error messages for you
> > (in IDLE then Terminal):
>
> > IDLE 2.6.2
> > >>> python module1.py
> > SyntaxError: invalid syntax
>
> The default IDLE window is a python shell window. ?That is, you are
> already "inside" the python interpreter, the same as if you typed just
> "python", with no file name, in the Terminal window. ?You can use that
> to execute python statements and introspect objects, among other things. ?
> Try it.
>
> But, back in IDLE, ignore that window for the moment and use the Open
> command in the File Menu to select and open your file module1.py from
> whatever directory it is in. ?A new window should open with the contents
> of that file. ?With that window selected (click on it, if necessary),
> there should be a "Run" option in the Menu bar and under it will be a
> "Run Script" option that will cause the script to run and the output to
> appear in the shell window. ?You can then explore the other options
> available in IDLE for debugging, etc.
>
> --
> ?Ned Deily,
> ?n... at acm.org

Awesome. I think that clears it up (at least enough for now). Thank
you both very much.


From seanm.py at gmail.com  Sat May  2 20:10:14 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Sat, 2 May 2009 17:10:14 -0700 (PDT)
Subject: Most Basic Question Ever - please help
References: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
	<mailman.4994.1241300789.11746.python-list@python.org>
	<0b10f7fd-9b08-40d4-8395-83bdfe860f90@v23g2000pro.googlegroups.com>
Message-ID: <e4119b7f-ce52-4eda-ab18-749245362625@x6g2000vbg.googlegroups.com>

On May 2, 6:25?pm, John Machin <sjmac... at lexicon.net> wrote:
> On May 3, 7:46?am, Dave Angel <da... at ieee.org> wrote:
>
>
>
> > seanm... at gmail.com wrote:
> > > I am going to try posting here again with more detail to see if I can
> > > finally get my first program to work.
>
> > > I am working on a MacBook Pro with OS X 10.4.11. I opened a new window
> > > in IDLE to create a file. The file had only one line of code and was
> > > saved as module1.py. I saved it to Macintosh HD. The one line of code
> > > in the file is copied below:
>
> > > print 'Hello module world!'
>
> > > I closed the file and tried to run it in IDLE and Terminal, but I have
> > > had no success. I'll paste my commands and the error messages below
> > > (for IDLE, then Terminal). Any help would be very much appreciated. I
> > > feel like the marathon just started and I've fallen flat on my face.
> > > Thanks.
>
> > > IDLE 2.6.2
>
> > >>>> python module1.py
>
> > > SyntaxError: invalid syntax
>
> > > sean-m-computer:~ seanm$ python
> > > Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> > > [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> > > Type "help", "copyright", "credits" or "license" for more information.
>
> > >>>> python module1.py
>
> > > ? File "<stdin>", line 1
> > > ? ? python module1.py
> > > ? ? ? ? ? ? ? ? ?^
> > > SyntaxError: invalid syntax
>
> > In both cases, you're already running python. ?Why would you expect to
> > have to run python inside python?
>
> > Once you're at a python prompt (in either of your cases), you use the
> > command "import" to load a module. ?And you do not put the ".py"
> > extension on the parameter. ?Specifically, it should look like this, and
> > very similar for IDLE.
>
> > M:\Programming\Python\sources\temp>c:\ProgFiles\Python26\python.exe
> > Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit
> > (Intel)] on
> > win32
> > Type "help", "copyright", "credits" or "license" for more information.
> > ?>>> import module1
> > Hello module world!
> > ?>>>
>
> Dave, importing modules which have side effects like printing is NOT a
> good habit to which a beginner should be introduced. He needs to know
> how to run a script.
>
> Sean, in Terminal, instead of typing
> ? ? python
> type
> ? ? python module1.py
>
> and I suggest that you give your script (not module) a more meaningful
> name.
>
> HTH,
> John

Great. Thank you both very much. I appreciate the help.


From mark.seagoe at gmail.com  Sat May  2 20:45:29 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Sat, 2 May 2009 17:45:29 -0700 (PDT)
Subject: web access through vpn client
References: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
	<EuOdnVFd2dThB2bUnZ2dnUVZ8gqdnZ2d@bt.com>
	<3b82989a-7e54-461a-b18f-dc90d803c0f9@x29g2000prf.googlegroups.com>
	<TvadnXMrGYqZh2HUnZ2dnUVZ8uydnZ2d@bt.com>
Message-ID: <fa9bad22-f239-447e-88e1-cac01c28a541@d38g2000prn.googlegroups.com>

On May 2, 3:01?am, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> mark.sea... at gmail.com wrote:
> > On May 1, 5:57 pm, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
> > wrote:
> >> mark.sea... at gmail.com wrote:
> >>> Hi;
> >>> I am trying to retrieve financial data off website for stock market
> >>> analysis. ?Just hobby not for pay. ?I actually am impressed that
> >>> urllib2 and BeautifulSoup work pretty well to do what I want, and the
> >>> first little routine actually gets the data from the web page...
> >>> except if my VPN client is turned on.
> >>> I've looked around for a solution but can't find... perhaps I'm not
> >>> entering the right search words. ?I don't even know where to start.
> >>> Can anyone suggest some good reading, or basic idea how to approach?
> >>> Thanks,
> >>> Mark
> >> When the VPN client is on, can you actually still browse the 'classical'
> >> way to the website in question?
> >> I ask this because many cooperate VPN clients have a way of shutting
> >> down all other access besides to the VPN server (which is very annoying
> >> but I can see the logic behind it).
>
> >> If that is the case your VPN network might have a webproxy which needs
> >> to be configured to continue browsing when connected to the VPN. For
> >> python you can automate this by checking for access to the proxy and use
> >> it if it is there.
>
> >> --
> >> MPHhttp://blog.dcuktec.com
>
> > Yes when Cisco AnyConnect VPN client is connected, I can browse w/
> > IE. ?I think the packets get encrypted and possibly go to my company's
> > server and out from there, because then also Outlook connects to my
> > company, Communicator works, etc. ?With VPN off I can browse and
> > Python can get URL, but no connection through my company's server & no
> > encryption.
>
> > Where can I find out more about how to configure the webproxy, if the
> > info is handy? ?Thanks!
>
> > Mark
>
> Most likely your IE gets automatically configured for using a proxy when
> the VPN is made, just check your IE settings ounce you are connected to
> the VPN particular the Connection / LAN-connection settings.
> Or query what is set in the registry at :
> 'HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet
> Settings'
>
> And use the content (if set) as the proxy address in the urllib module.
>
> You might find this module useful for that:http://docs.python.org/library/_winreg.html
>
> --
> MPHhttp://blog.dcuktec.com- Hide quoted text -
>
> - Show quoted text -

Thanks! I'll check it out.


From ebonak at hotmail.com  Sat May  2 21:31:38 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 02 May 2009 21:31:38 -0400
Subject: for with decimal values?
In-Reply-To: <8763gjm5gt.fsf@benfinney.id.au>
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<8763gjm5gt.fsf@benfinney.id.au>
Message-ID: <49FCF3FA.3020401@hotmail.com>

Ben Finney wrote:
> 
> Note that those values are of type ?float?, which is a distinct type
> from ?Decimal? with very different behaviour.
> 
>> If there is such a thing already available, I'd like to use it,
>> otherwise I can write a function to mimic this, but I thought I'd
>> check (my search yielded nothing).
> 
> You can write a function to do it.
> 
> Alternatively, this case seems simple enough that you can write a
> generator expression. Assuming you want ?Decimal? values:
> 
>     >>> from decimal import Decimal
>     >>> amounts = (Decimal(mantissa)/10 for mantissa in range(-105, 105))
>     >>> for amount in amounts:
>     ...     print amount
>     ...


Another nice solution stored away for use!

Thanks,
Esmail



From soumen08 at gmail.com  Sat May  2 21:41:09 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Sun, 3 May 2009 07:11:09 +0530
Subject: Can someone please explain to me this code?
Message-ID: <f6a09c160905021841p27b63c57u33f5c406bb4bbbdf@mail.gmail.com>

Hello,
I was trying to find a method to make global hotkeys with python in
linux. I found this one which uses a library called python-xlib. The
point is that since i dont have much experience with this, i cant
understand some of the code. Can someone please explain to me how this
code works?  According to the author, it is meant to reduce and
increase volume. Im not interested in that specifically. All i want is
to be ale to bind a hotkey to a function in my python program.

from Xlib.display import Display
from Xlib import X
import oss

# custom keys from my dell D400 Laptop
vol_plus  = 176
vol_moins = 174

keys = [vol_plus,vol_moins]

def changeVolume(aValue):
mixer = oss.open_mixer()
symbol = oss.SOUND_DEVICE_LABELS.index('Vol  ')
left,right  = mixer.read_channel(symbol)

avg = (left + right) / 2
if (avg + aValue) >= 0:
mixer.write_channel(symbol,(left + aValue,right + aValue))
mixer.close()

def handle_event(aEvent):
keycode = aEvent.detail
if aEvent.type == X.KeyPress:
if keycode == vol_moins:
changeVolume(-2)
elif keycode == vol_plus:
changeVolume(+2)

def main():
# current display
disp = Display()
root = disp.screen().root

# we tell the X server we want to catch keyPress event
root.change_attributes(event_mask = X.KeyPressMask)

for keycode in keys:
root.grab_key(keycode, X.AnyModifier, 1,X.GrabModeAsync, X.GrabModeAsync)

while 1:
event = root.display.next_event()
handle_event(event)

if __name__ == '__main__':
main()
Regards
Soumen


From gert.cuykens at gmail.com  Sat May  2 21:53:37 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 2 May 2009 18:53:37 -0700 (PDT)
Subject: eval(WsgiApplication)
References: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
	<m2skjn52t0.fsf@googlemail.com>
	<39057d64-921e-4150-a382-ec1d443a383f@j12g2000vbl.googlegroups.com>
	<a4qtc6-poi.ln1@archaeopteryx.softver.org.mk>
Message-ID: <ab21f3ef-60f0-4389-a60d-a5abdef08b76@o20g2000vbh.googlegroups.com>

On May 2, 2:15?pm, ?????? ??????????? <gdam... at gmail.com> wrote:
> >> > How do I do this in python3?
>
> >> What's wrong with importing it?
>
> > The problem is that my wsgi files have a wsgi extention for mod_wsgi
> > use
> ..
> > mod_wsgi has a .wsgi handler because it is recommended to rename the
> > wsgi file with wsgi extensions to avoid double imports
> > cherrypy server has a dispatcher class
>
> You can either use .py extension for the wsgi files OR use a custom
> importer that can import your .wsgi fileshttp://docs.python.org/library/modules.html
>
> --
> ?????? (http://softver.org.mk/damjan/)
>
> Scarlett Johansson: You always see the glass half-empty.
> Woody Allen: No. I see the glass half-full, but of poison.

I stick with the .py files thank you :)


From gert.cuykens at gmail.com  Sat May  2 21:56:12 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 2 May 2009 18:56:12 -0700 (PDT)
Subject: return functions
References: <f6a8cbe2-2078-4e0a-8b52-6437b440d18d@o30g2000vbc.googlegroups.com>
	<2b9deb7a-327d-40b2-8df9-d6db916a6bab@s28g2000vbp.googlegroups.com> 
	<0b04c45d-0152-4498-a331-a19452c29b2f@l28g2000vba.googlegroups.com>
Message-ID: <901b5269-fd69-4664-aae7-4cce91ed1dd9@o14g2000vbo.googlegroups.com>

On May 3, 12:17?am, gert <gert.cuyk... at gmail.com> wrote:
> On May 2, 10:58?pm, gert <gert.cuyk... at gmail.com> wrote:
>
>
>
> > On May 2, 10:44?pm, gert <gert.cuyk... at gmail.com> wrote:
>
> > > Aldo i like the cerrypy wsgi server very much, i do not like the tools
> > > that go with it
> > > so i am stuck with a configuration file that looks like this
>
> > >http://pastebin.com/m4d8184bc
>
> > > After 152 line I finally arrived to a point where i was thinkig "thats
> > > it, this is like going to work on a uni cycle and is just plain
> > > ridicules"
>
> > > So how can i generate some functions something like
>
> > > def generate(url,type): # where type could be htm js css or wsgi
>
> > I was thinking something like this ?
>
> > def static(url, mime):
> > ? ? def application(environ, response):
> > ? ? ? ? f=open(os.path.join(os.path.dirname(__file__), url),'rb')
> > ? ? ? ? l=os.fstat(f.fileno()).st_size
> > ? ? ? ? response('200 OK', [('Content-type', mime+';charset=utf-8'),
> > ('Content-Length', str(l))])
> > ? ? ? ? return FileWrapper(f, 8192)
> > ? ? return application
>
> it works, i reduced it to this :-)
>
> http://code.google.com/p/appwsgi/source/browse/trunk/server.py
>
> any other suggestions to make it smaller and more automatic ?

Wait a minute why am i not using this ?

http://docs.python.org/3.0/library/wsgiref.html#wsgiref.util.request_uri

And just make my own server ?


From ross.jett at gmail.com  Sat May  2 22:13:51 2009
From: ross.jett at gmail.com (Ross)
Date: Sat, 2 May 2009 19:13:51 -0700 (PDT)
Subject: yet another list comprehension question
Message-ID: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>

I'm trying to set up a simple filter using a list comprehension. If I
have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
and I wanted to filter out all tuples containing None, I would like to
get the new list b = [(1,2), (3,4),(6,7)].

I tried b = [i for i in a if t for t in i is not None]   but I get the
error that "t is not defined". What am I doing wrong?


From clp2 at rebertia.com  Sat May  2 22:21:47 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 2 May 2009 19:21:47 -0700
Subject: yet another list comprehension question
In-Reply-To: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
Message-ID: <50697b2c0905021921u4189e2c0n205bdc6a43f1b18d@mail.gmail.com>

On Sat, May 2, 2009 at 7:13 PM, Ross <ross.jett at gmail.com> wrote:
> I'm trying to set up a simple filter using a list comprehension. If I
> have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
> and I wanted to filter out all tuples containing None, I would like to
> get the new list b = [(1,2), (3,4),(6,7)].

b = [tup for tup in a if None not in tup]

Cheers,
Chris
-- 
http://blog.rebertia.com


From ross.jett at gmail.com  Sat May  2 22:23:38 2009
From: ross.jett at gmail.com (Ross)
Date: Sat, 2 May 2009 19:23:38 -0700 (PDT)
Subject: yet another list comprehension question
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
	<mailman.4997.1241317312.11746.python-list@python.org>
Message-ID: <126c59d6-4f6a-4d88-a4a3-d6d8ee03f353@h23g2000vbc.googlegroups.com>

On May 2, 7:21?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Sat, May 2, 2009 at 7:13 PM, Ross <ross.j... at gmail.com> wrote:
> > I'm trying to set up a simple filter using a list comprehension. If I
> > have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
> > and I wanted to filter out all tuples containing None, I would like to
> > get the new list b = [(1,2), (3,4),(6,7)].
>
> b = [tup for tup in a if None not in tup]
>
> Cheers,
> Chris
> --http://blog.rebertia.com

Thanks I feel retarded sometimes.


From debatem1 at gmail.com  Sat May  2 22:25:03 2009
From: debatem1 at gmail.com (CTO)
Date: Sat, 2 May 2009 19:25:03 -0700 (PDT)
Subject: yet another list comprehension question
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
Message-ID: <086ef9ec-da1f-4275-9d48-a62c3a7122af@s1g2000prd.googlegroups.com>

On May 2, 10:13?pm, Ross <ross.j... at gmail.com> wrote:
> I'm trying to set up a simple filter using a list comprehension. If I
> have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
> and I wanted to filter out all tuples containing None, I would like to
> get the new list b = [(1,2), (3,4),(6,7)].

try this:

b = [i for i in a if None not in i]

> I tried b = [i for i in a if t for t in i is not None] ? but I get the
> error that "t is not defined". What am I doing wrong?

You've got a "for" and an "if" backwards. t isn't defined when the if
tries to evaluate it.





From debatem1 at gmail.com  Sat May  2 22:39:33 2009
From: debatem1 at gmail.com (CTO)
Date: Sat, 2 May 2009 19:39:33 -0700 (PDT)
Subject: Can someone please explain to me this code?
References: <mailman.4996.1241314876.11746.python-list@python.org>
Message-ID: <b8f69840-6e90-4e93-81db-163431ec5478@n7g2000prc.googlegroups.com>

On Sat, May 2, 2009 at 9:41 PM, Soumen banerjee <soumen08 at gmail.com>
wrote:

    Hello,
    I was trying to find a method to make global hotkeys with python
in
    linux. I found this one which uses a library called python-xlib.
The
    point is that since i dont have much experience with this, i cant
    understand some of the code. Can someone please explain to me how
this
    code works?  According to the author, it is meant to reduce and
    increase volume. Im not interested in that specifically. All i
want is
    to be ale to bind a hotkey to a function in my python program.


It's not so hard. Just a little confusing at first. The thing is that
X is a
client-server protocol, so it doesn't call a function or anything to
let
you know that the user has pressed a key- it just sends all the events
you've asked for to your application, and lets it handle them how it
will. To get a better idea about how that happens, fire up xev (the
X Event Viewer) on your console.

    from Xlib.display import Display
    from Xlib import X


You still need these


    def handle_event(aEvent):
         keycode = aEvent.detail
         if aEvent.type == X.KeyPress:
             if keycode == vol_moins:
                 changeVolume(-2)
             elif keycode == vol_plus:
                 changeVolume(+2)


(Spacing mine)
You don't really care about this, but the important thing is how
it's structured. It takes an event, then gets its detail attribute,
which is where the key that is pressed will go if it is a keypress,
then sees if its type is KeyPress, then performs the appropriate
action based on that keycode. Your app will do pretty much the
same thing, just with different actions.


    def main():
         # current display
         disp = Display()
         root = disp.screen().root

         # we tell the X server we want to catch keyPress event
         root.change_attributes(event_mask = X.KeyPressMask)

         for keycode in keys:
             root.grab_key(keycode, X.AnyModifier, 1,X.GrabModeAsync,
X.GrabModeAsync)

         while 1:
             event = root.display.next_event()
             handle_event(event)

    if __name__ == '__main__':
    main()


(spacing mine)
While I'd do things a little differently, this is pretty much
boilerplate.
You can use this as a template for what you want to do, assuming
that you've appropriately defined your keycodes and handle_event
function.

Geremy Condra



From apt.shansen at gmail.com  Sat May  2 23:01:55 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sat, 2 May 2009 20:01:55 -0700
Subject: Multiprocessing + Frozen bug?
Message-ID: <7a9c25c20905022001g1cdc7440gfcbe071d007f06b4@mail.gmail.com>

In the multiprocessing.forking module, there's:
    def get_command_line():
        ...

        if getattr(sys, 'frozen', False):
            return [sys.executable, '--multiprocessing-fork']
        else:
            prog = 'from multiprocessing.forking import main; main()'
            return [_python_exe, '-c', prog, '--multiprocessing-fork']

I think that the test there should be "if not getattr(sys, 'frozen',
False):", because if its not frozen then you want to use the sys.executable
-- but if it is, you want to use the one which has been explicitly set. I
think, at least. I'm not quite sure if I want to report it as a bug yet
because I'm very new to multiprocessing and am doing something very
complicated (a windows service using multiprocessing to start various
processes, each of which start arbitrary thirdparty-non-python subprocesses
themselves) so maybe my understanding is wrong.

Or iiis it not?

--S
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From darcy at druid.net  Sat May  2 23:20:25 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sun, 3 May 2009 03:20:25 +0000
Subject: problem with money datatype based calculations in python
In-Reply-To: <1241289437.3842.6.camel@kk-laptop>
References: <mailman.4963.1241250341.11746.python-list@python.org>
	<r8vtc6-vh1.ln1@spamfence.net>
	<20090502115734.b280bf35.darcy@druid.net>
	<1241289437.3842.6.camel@kk-laptop>
Message-ID: <20090503032025.06428836.darcy@druid.net>

On Sun, 03 May 2009 00:07:17 +0530
Krishnakant <krmane at gmail.com> wrote:
> On Sat, 2009-05-02 at 11:57 -0400, D'Arcy J.M. Cain wrote:
> > And if you use PyGreSQL (http://www.PyGreSQL.org/) to connect to
> > the database then the money type is already converted to Decimal.
> > d'arcy, I visited the home page for pygresql and discovered that you wrote the library.

Sorry, I should have mentioned my bias.  :-)

> I am happy that you also included a non-dbapi (postgresql classic
> interface ) along with the standard DBAPI module.

That interface existed before there was a DB-API spec.  We added the
DB-API interface later and decided to support both.

> I would like to know if it has been tested with postgresql 8.3 and are

The current version of PyGreSQL has been tested with Python 2.5 and
PostGreSQL 8.3. Older version should work as well, but you will need
at least Python 2.3 and PostgreSQL 7.4.

> there any known bottlenecks while using this driver module on large
> scale database opperations?

None that I know of.  It is used on some pretty big databases that I
know of.

> Is this actively maintained?

Yes.

I'll leave the rest of the questions for someone less biased.  :-)

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From soumen08 at gmail.com  Sat May  2 23:43:32 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Sun, 3 May 2009 09:13:32 +0530
Subject: Can someone please explain to me this code?
In-Reply-To: <b8f69840-6e90-4e93-81db-163431ec5478@n7g2000prc.googlegroups.com>
References: <mailman.4996.1241314876.11746.python-list@python.org>
	<b8f69840-6e90-4e93-81db-163431ec5478@n7g2000prc.googlegroups.com>
Message-ID: <f6a09c160905022043s74cf17f0u37027da633c0a23@mail.gmail.com>

Hello,
I'd like a little more help with the following lines:
				
root.change_attributes(event_mask = X.KeyPressMask)

        for keycode in keys:
            root.grab_key(keycode, X.AnyModifier, 1,X.GrabModeAsync,
X.GrabModeAsync)

what exactly do they do?
regards
Soumen


From debatem1 at gmail.com  Sun May  3 00:03:48 2009
From: debatem1 at gmail.com (CTO)
Date: Sat, 2 May 2009 21:03:48 -0700 (PDT)
Subject: Can someone please explain to me this code?
References: <mailman.4996.1241314876.11746.python-list@python.org> 
	<b8f69840-6e90-4e93-81db-163431ec5478@n7g2000prc.googlegroups.com> 
	<mailman.5000.1241322217.11746.python-list@python.org>
Message-ID: <a2c042a9-bc65-40ec-8bca-4003f1541686@m24g2000vbp.googlegroups.com>

> root.change_attributes(event_mask = X.KeyPressMask)

This asks X to send this application keypress events

> root.grab_key(keycode, X.AnyModifier, 1,X.GrabModeAsync, X.GrabModeAsync)

This tells X to grab the keyboard if the given keycode is generated
and
any modifier is pressed, not to stop processing keyboard events, and
not
to stop processing pointer events. That's pretty safe, although I'm
not
sure if you'd need the modifier for your application.



From cmpython at gmail.com  Sun May  3 00:22:09 2009
From: cmpython at gmail.com (CM)
Date: Sat, 2 May 2009 21:22:09 -0700 (PDT)
Subject: Most Basic Question Ever - please help
References: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
Message-ID: <7c328de7-ed20-450c-819f-7689e73f6a6c@g19g2000vbi.googlegroups.com>

On May 2, 4:36?pm, seanm... at gmail.com wrote:
> I am going to try posting here again with more detail to see if I can
> finally get my first program to work.
>
> I am working on a MacBook Pro with OS X 10.4.11. I opened a new window
> in IDLE to create a file. The file had only one line of code and was
> saved as module1.py. I saved it to Macintosh HD. The one line of code
> in the file is copied below:
>
> print 'Hello module world!'
>
> I closed the file and tried to run it in IDLE and Terminal, but I have
> had no success. I'll paste my commands and the error messages below
> (for IDLE, then Terminal). Any help would be very much appreciated. I
> feel like the marathon just started and I've fallen flat on my face.
> Thanks.
>
> IDLE 2.6.2>>> python module1.py
>
> SyntaxError: invalid syntax
>
> sean-m-computer:~ seanm$ python
> Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.>>> python module1.py
>
> ? File "<stdin>", line 1
> ? ? python module1.py
> ? ? ? ? ? ? ? ? ?^
> SyntaxError: invalid syntax

Sean, also, keep in mind you can use IDLE to run
your scripts.  After you have saved a script/program,
there is an option for Run in the menu, and then under
that, Run Module.  The output of the script will be
sent to IDLE window indicated as the Python shell.
You can also just test code directly from within
that shell, though for multi-line programs, it is
easier within the composing window.

I suggest you sign up for the Python tutor list:
http://mail.python.org/mailman/listinfo/tutor

And you can search through their big archive of
questions and answers here:
http://www.nabble.com/Python---tutor-f2981.html

The tutors there are great and super-helpful, and
will field any level of question but are particularly
good for absolute beginners.

Here is a tutorial on using IDLE:
http://hkn.eecs.berkeley.edu/~dyoo/python/idle_intro/index.html

And here is a very good general programming tutorial online
book, focusing on Python:
http://www.freenetpages.co.uk/hp/alan.gauld/

Good luck!
Che


From Kevin.Smith at sas.com  Sun May  3 00:36:26 2009
From: Kevin.Smith at sas.com (Kevin D. Smith)
Date: Sat, 2 May 2009 23:36:26 -0500
Subject: Doc strings in descriptors
Message-ID: <gtj70a$h7d$1@foggy.unx.sas.com>

I have a simple descriptor to create a cached property as shown below.

class cproperty(object):
    """ Property whose value is only calculated once and cached """
    def __init__(self, func):
        self._func = func
        self.__doc__ = func.__doc__
    def __get__(self, obj, type=None):
        if obj is None:
            return self
        try:
            return getattr(obj, '@%s' % self._func.func_name)
        except AttributeError:
            result = self._func(obj)
            setattr(obj, '@%s' % self._func.func_name, result)
            return result

The problem is that when I use the help() function on them, I don't get 
the doc string from the function that is being wrapped.  Instead, I get 
the following:

    hasEmployees = <StudioManager.utils.cproperty object at 0xf126f0>

What do I need to do to get the doc string of the wrapped function to 
apper when using help()?

-- 
Kevin D. Smith



From Graham.Dumpleton at gmail.com  Sun May  3 00:58:21 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Sat, 2 May 2009 21:58:21 -0700 (PDT)
Subject: eval(WsgiApplication)
References: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
	<m2skjn52t0.fsf@googlemail.com>
	<39057d64-921e-4150-a382-ec1d443a383f@j12g2000vbl.googlegroups.com>
	<a4qtc6-poi.ln1@archaeopteryx.softver.org.mk>
Message-ID: <8dfeb7b5-1a06-44c6-b9be-581093d89d8e@d19g2000prh.googlegroups.com>

On May 2, 10:15?pm, ?????? ??????????? <gdam... at gmail.com> wrote:
> >> > How do I do this in python3?
>
> >> What's wrong with importing it?
>
> > The problem is that my wsgi files have a wsgi extention for mod_wsgi
> > use
> ..
> > mod_wsgi has a .wsgi handler because it is recommended to rename the
> > wsgi file with wsgi extensions to avoid double imports
> > cherrypy server has a dispatcher class
>
> You can either use .py extension for the wsgi files OR use a custom
> importer that can import your .wsgi fileshttp://docs.python.org/library/modules.html

You don't have to go to such an extreme if it is only for one file to
be used as root WSGI application. Can use something like:

  def load_script(filename, label='__wsgi__'):
    module = imp.new_module(label)
    module.__file__ = filename
    execfile(filename, module.__dict__)
    return module

  module = load_script('/some/path/file.wsgi')

  application = module.application

Graham


From Graham.Dumpleton at gmail.com  Sun May  3 01:33:23 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Sat, 2 May 2009 22:33:23 -0700 (PDT)
Subject: return functions
References: <f6a8cbe2-2078-4e0a-8b52-6437b440d18d@o30g2000vbc.googlegroups.com>
Message-ID: <5dde50ab-c47d-471a-a8cb-3824387f42c5@x1g2000prh.googlegroups.com>

On May 3, 6:44?am, gert <gert.cuyk... at gmail.com> wrote:
> Aldo i like the cerrypywsgiserver very much, i do not like the tools
> that go with it
> so i am stuck with a configuration file that looks like this
>
> http://pastebin.com/m4d8184bc
>
> After 152 line I finally arrived to a point where i was thinkig "thats
> it, this is like going to work on a uni cycle and is just plain
> ridicules"
>
> So how can i generate some functions something like
>
> def generate(url,type): # where type could be htm js css orwsgi

You seem to have finally discovered that when using Apache/mod_wsgi,
Apache does a level of URL matching to filesystem based resources.
This isn't automatic in normal WSGI servers unless you use a WSGI
middleware that does the mapping for you. :-)

Graham


From stefan_ml at behnel.de  Sun May  3 02:25:33 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sun, 03 May 2009 08:25:33 +0200
Subject: eric not working on ubuntu 9.04
In-Reply-To: <mailman.4989.1241296969.11746.python-list@python.org>
References: <mailman.4989.1241296969.11746.python-list@python.org>
Message-ID: <49fd38dd$0$31333$9b4e6d93@newsspool4.arcor-online.net>

bvidinli wrote:
> An unhandled exception occurred. Please report the problem
> using the error reporting dialog or via email to <eric4-bugs at die-offenbachs.de>.
> A log has been written to "/home/bvidinli/.eric4/eric4_error.log".

Did you try that?

Stefan


From jhmsmits at gmail.com  Sun May  3 03:06:37 2009
From: jhmsmits at gmail.com (SanPy)
Date: Sun, 3 May 2009 00:06:37 -0700 (PDT)
Subject: writing consecutive data to subprocess command 'more'
References: <b2ea7665-4a7e-4563-91ac-5d899e7903a3@t10g2000vbg.googlegroups.com>
	<mailman.4988.1241296526.11746.python-list@python.org>
	<c9776d62-5d87-4f6c-b002-3690c6e21e87@t11g2000vbc.googlegroups.com>
Message-ID: <427b5e4e-4754-48d1-985a-809ff2328ca0@b1g2000vbc.googlegroups.com>

Hmm, it works as long as the pager command is available on the system.
I created a test file to explain what I mean. You can find it here:
http://gist.github.com/105880

The 'pager' command is on purpose a command that is not available on
the system.
It should fall back to sys.stdout in the write method. However, it
does not show any output at all.
Strangely enough, when a put a time.sleep(1) between the first and
second printer.write statements, the second and third statement do
appear.
Btw, the normal pager command works fine on my system.
How can I solve this, so that the fallback sys.stdout does show
output?
---
Sander

On 2 mei, 23:00, SanPy <jhmsm... at gmail.com> wrote:
> Thanks, that works beautifully!
>
> Regards,
> Sander
>
> On 2 mei, 22:35, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
>
> > communicate writes to the child's stdin and waits for it to finish. If you ?
> > want to keep writing, don't use communicate. And you'll need to keep state ?
> > ?from one call to another, so use a class. Based on the code above, create ?
> > a class Pager with __init__, write and close methods:
>
> > class Pager:
> > ? def __init__(self):
> > ? ?# copy the logic above
> > ? ?self.proc = subprocess.Popen(...)
> > ? ?self.file = self.proc.stdin
> > ? ?# if something goes wrong, set self.proc=None and self.file=sys.stdout
>
> > ? def write(self, text):
> > ? ?self.file.write(text)
>
> > ? def close(self):
> > ? ?if self.proc:
> > ? ? self.file.close()
> > ? ? self.proc.wait()
>
> > Also, take a look at the pager function in the pydoc module (see the ?
> > source) - it handles several cases.
>
> > --
> > Gabriel Genellina



From mabdelkader at gmail.com  Sun May  3 03:07:41 2009
From: mabdelkader at gmail.com (ma)
Date: Sun, 3 May 2009 03:07:41 -0400
Subject: yet another list comprehension question
In-Reply-To: <086ef9ec-da1f-4275-9d48-a62c3a7122af@s1g2000prd.googlegroups.com>
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
	<086ef9ec-da1f-4275-9d48-a62c3a7122af@s1g2000prd.googlegroups.com>
Message-ID: <148918f0905030007l3fc7280co8bc4c46a56c7e52f@mail.gmail.com>

This isn't list comprehension, but it's something to keep in mind:
b = filter(lambda x: None not in x, input_list)


On Sat, May 2, 2009 at 10:25 PM, CTO <debatem1 at gmail.com> wrote:

> On May 2, 10:13 pm, Ross <ross.j... at gmail.com> wrote:
> > I'm trying to set up a simple filter using a list comprehension. If I
> > have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
> > and I wanted to filter out all tuples containing None, I would like to
> > get the new list b = [(1,2), (3,4),(6,7)].
>
> try this:
>
> b = [i for i in a if None not in i]
>
> > I tried b = [i for i in a if t for t in i is not None]   but I get the
> > error that "t is not defined". What am I doing wrong?
>
> You've got a "for" and an "if" backwards. t isn't defined when the if
> tries to evaluate it.
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 03:13:40 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 07:13:40 GMT
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<bd847bb3-e52a-4755-8bc2-a795abfc92fc@o14g2000vbo.googlegroups.com>
Message-ID: <00191e5c$0$9761$c3e8da3@news.astraweb.com>

On Sat, 02 May 2009 11:01:39 -0700, bearophileHUGS wrote:

> Esmail:
>> Is there a Python construct to allow me to do something like this:
>> ? ? for i in range(-10.5, 10.5, 0.1):
> 
> Sometimes I use an improved version of this:
> http://code.activestate.com/recipes/66472/


Care to contribute your improvements back to the recipe? Or at least 
here? I for one am curious to see how you do it.


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 03:21:06 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 07:21:06 GMT
Subject: Doc strings in descriptors
References: <gtj70a$h7d$1@foggy.unx.sas.com>
Message-ID: <00192019$0$9761$c3e8da3@news.astraweb.com>

On Sat, 02 May 2009 23:36:26 -0500, Kevin D. Smith wrote:

> I have a simple descriptor to create a cached property as shown below.
...
> What do I need to do to get the doc string of the wrapped function to
> apper when using help()?

Call it on the class, not the instance:


>>> class Test(object):
...     def getx(self): return "spam"
...     def setx(self, value): return None  # and do nothing
...     x = property(getx, setx, None, "This is my docstring")
...
>>> t = Test()
>>> t.x.__doc__  # like "spam".__doc__
'str(object) -> string\n\nReturn a nice string representation of the 
object.\nIf the argument is a string, the return value is the same 
object.'
>>> Test.x.__doc__
'This is my docstring'



-- 
Steven


From dusan.smitran at gmail.com  Sun May  3 03:25:32 2009
From: dusan.smitran at gmail.com (dusans)
Date: Sun, 3 May 2009 00:25:32 -0700 (PDT)
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org> 
	<bd847bb3-e52a-4755-8bc2-a795abfc92fc@o14g2000vbo.googlegroups.com> 
	<00191e5c$0$9761$c3e8da3@news.astraweb.com>
Message-ID: <2400dc46-f1f6-4621-b478-762557effa9e@z19g2000vbz.googlegroups.com>

>>> import numpy as np
>>> for i in np.arange(-10.5, 10.5, 0.1):
...     print i
...
-10.5
-10.4
-10.3
-10.2


From debatem1 at gmail.com  Sun May  3 03:34:08 2009
From: debatem1 at gmail.com (CTO)
Date: Sun, 3 May 2009 00:34:08 -0700 (PDT)
Subject: eric not working on ubuntu 9.04
References: <mailman.4989.1241296969.11746.python-list@python.org>
Message-ID: <6cf276e7-70c8-4653-8dde-aa6cad85c538@q14g2000vbn.googlegroups.com>

> ? File "/usr/lib/python2.6/email/message.py", line 790, in Message
> ? ? from email.Iterators import walk

Well, the module is called email.iterators (rather than
email.Iterators),
for starters. It looks like __all__ exports both names (which seems a
little dodgy to me, but hey, y'all are the experts) but Ubuntu messes
with Python a lot before it makes it to a package. I don't have a
jaunty
box handy, but my guess is that some heinous confluence of
email.iterators.walk moving to Message.walk() in python 3, the module
email.Iterators not existing anymore, and Ubuntu messing with Python
has caused the whole house of cards to come crashing down. If I were
you, I'd probably do the following:

1) file a ubuntu bug report
2) see if you can fire up the interpreter and see if the following
works:

>>> from email.Iterators import walk

If not, try it with the 'i' lowercased. If that works, you've got your
culprit. Otherwise, let me know and I'll take a look at it when I get
back in front of my jaunty box.

Geremy Condra


From __peter__ at web.de  Sun May  3 03:54:44 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 03 May 2009 09:54:44 +0200
Subject: eric not working on ubuntu 9.04
References: <mailman.4989.1241296969.11746.python-list@python.org>
Message-ID: <gtjik5$de6$02$1@news.t-online.com>

bvidinli wrote:

> any idea ?

It works on my Kubuntu 9.04, but I can provoke a similar error with

$ export PYTHONPATH=`pwd`
$ touch email.py
$ eric

As a first step I recommend that you make sure that eric doesn't 
accidentally import modules written by you. 

Peter



From aleksandar27 at brisiovonet.hr  Sun May  3 04:33:43 2009
From: aleksandar27 at brisiovonet.hr (alejandro)
Date: Sun, 3 May 2009 10:33:43 +0200
Subject: stuck with PyOBEX
References: <gt78o7$i9n$1@ss408.t-com.hr> <75opebF19fc22U1@mid.uni-berlin.de>
	<gt80qd$mbf$1@get-news01.get.basefarm.net>
	<gt8pbj$j3o$1@ss408.t-com.hr>
	<gtatk5$pff$1@get-news01.get.basefarm.net>
	<gthe40$87q$1@ss408.t-com.hr>
	<gthm2m$sdr$1@get-news01.get.basefarm.net>
Message-ID: <gtjktg$ai0$1@ss408.t-com.hr>

Yes!

> I haven't tried to run it under Windows. I just assumed that 
> BluetoothSocket
> would have the same API on both Linux and Windows.
>
> Looking around, it seems that this is something we can work around:
>
> http://svn.navi.cx/misc/trunk/laserprop/client/BluetoothConduit.py
>
> I'll send you an updated version to try if you would like to test it.
>
> David 




From bruce306 at rogers.com  Sun May  3 06:43:27 2009
From: bruce306 at rogers.com (Uncle Bruce)
Date: Sun, 3 May 2009 03:43:27 -0700 (PDT)
Subject: Use of Unicode in Python 2.5 source code literals
Message-ID: <0658da84-6bcf-4689-8a5a-4b934202af08@t10g2000vbg.googlegroups.com>

I'm working with Python 2.5.4 and the NLTK (Natural Language
Toolkit).  I'm an experienced programmer, but new to Python.

This question arose when I tried to create a literal in my source code
for a Unicode codepoint greater than 255.  (I also posted this
question in the NLTK discussion group).

The Python HELP (at least for version 2.5.4) states:

+++++++
Python supports writing Unicode literals in any encoding, but you have
to declare the encoding being used. This is done by including a
special comment as either the first or second line of the source file:

#!/usr/bin/env python
# -*- coding: latin-1 -*-
++++++++++++

Based on some experimenting I've done, I suspect that the support for
Unicode literals in ANY encoding isn't really accurate.  What seems to
happen is that there must be an 8-bit mapping between the set of
Unicode literals and what can be used as literals.

Even when I set Options / General / Default Source Encoding to UTF-8,
IDLE won't allow Unicode literals (e.g. characters copied and pasted
from the Windows Character Map program) to be used, even in a quoted
string, if they represent an ord value greater than 255.

I noticed, in researching this question, that Marc Andre Lemburg
stated, back in 2001, "Since Python source code is defined to be
ASCII..."

I'm writing code for linguistics (other than English), so I need
access to lots more characters.  Most of the time, the characters come
from files, so no problem.  But for some processing tasks, I simply
must be able to use "real" Unicode literals in the source code.
(Writing hex escape sequences in a complex regex would be a
nightmare).

Was this taken care of in the switch from Python 2.X to 3.X?

Is there a way to use more than 255 Unicode characters in source code
literals in Python 2.5.4?

Also, in the Windows version of Python, how can I tell if it was
compiled to support 16 bits of Unicode or 32 bits of Unicode?

Bruce in Toronto


From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 07:32:39 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 11:32:39 GMT
Subject: Use of Unicode in Python 2.5 source code literals
References: <0658da84-6bcf-4689-8a5a-4b934202af08@t10g2000vbg.googlegroups.com>
Message-ID: <00195b0e$0$9761$c3e8da3@news.astraweb.com>

On Sun, 03 May 2009 03:43:27 -0700, Uncle Bruce wrote:

> Based on some experimenting I've done, I suspect that the support for
> Unicode literals in ANY encoding isn't really accurate.  What seems to
> happen is that there must be an 8-bit mapping between the set of Unicode
> literals and what can be used as literals.
> 
> Even when I set Options / General / Default Source Encoding to UTF-8,
> IDLE won't allow Unicode literals (e.g. characters copied and pasted
> from the Windows Character Map program) to be used, even in a quoted
> string, if they represent an ord value greater than 255.

When you say it "won't allow", what do you mean? That you can't paste 
them into the document? Does it give an error? An exception at compile 
time or runtime?

I assume you have included the coding line at the top of the file. Make 
sure it says utf-8 and not latin-1.
 
# -*- coding: uft-8 -*-

This is especially important if you use a Windows text editor that puts a 
Unicode BOM at the start of the file.

What happens if you use a different editor to insert the characters in 
the file, and then open it in IDLE?

How are you writing the literals? As byte strings or unicode strings? E.g.

# filename = nonascii.py
theta = '?'  # byte string, probably will lead to problems
sigma = u'?'  # unicode, this is the Right Way



> Is there a way to use more than 255 Unicode characters in source code
> literals in Python 2.5.4?

It works for me in Python 2.4 and 2.5, although I'm not using IDLE.

>>> import nonascii
>>> nonascii.sigma
>>> print nonascii.sigma
?
>>> print nonascii.theta
?

Perhaps it is a problem with IDLE?



-- 
Steven


From mnordhoff at mattnordhoff.com  Sun May  3 07:37:35 2009
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Sun, 03 May 2009 11:37:35 +0000
Subject: Use of Unicode in Python 2.5 source code literals
In-Reply-To: <0658da84-6bcf-4689-8a5a-4b934202af08@t10g2000vbg.googlegroups.com>
References: <0658da84-6bcf-4689-8a5a-4b934202af08@t10g2000vbg.googlegroups.com>
Message-ID: <49FD81FF.1060207@mattnordhoff.com>

Uncle Bruce wrote:
> I'm working with Python 2.5.4 and the NLTK (Natural Language
> Toolkit).  I'm an experienced programmer, but new to Python.
> 
> This question arose when I tried to create a literal in my source code
> for a Unicode codepoint greater than 255.  (I also posted this
> question in the NLTK discussion group).
> 
> The Python HELP (at least for version 2.5.4) states:
> 
> +++++++
> Python supports writing Unicode literals in any encoding, but you have
> to declare the encoding being used. This is done by including a
> special comment as either the first or second line of the source file:
> 
> #!/usr/bin/env python
> # -*- coding: latin-1 -*-
> ++++++++++++
> 
> Based on some experimenting I've done, I suspect that the support for
> Unicode literals in ANY encoding isn't really accurate.  What seems to
> happen is that there must be an 8-bit mapping between the set of
> Unicode literals and what can be used as literals.
> 
> Even when I set Options / General / Default Source Encoding to UTF-8,
> IDLE won't allow Unicode literals (e.g. characters copied and pasted
> from the Windows Character Map program) to be used, even in a quoted
> string, if they represent an ord value greater than 255.
> 
> I noticed, in researching this question, that Marc Andre Lemburg
> stated, back in 2001, "Since Python source code is defined to be
> ASCII..."
> 
> I'm writing code for linguistics (other than English), so I need
> access to lots more characters.  Most of the time, the characters come
> from files, so no problem.  But for some processing tasks, I simply
> must be able to use "real" Unicode literals in the source code.
> (Writing hex escape sequences in a complex regex would be a
> nightmare).
> 
> Was this taken care of in the switch from Python 2.X to 3.X?
> 
> Is there a way to use more than 255 Unicode characters in source code
> literals in Python 2.5.4?
> 
> Also, in the Windows version of Python, how can I tell if it was
> compiled to support 16 bits of Unicode or 32 bits of Unicode?
> 
> Bruce in Toronto

Works for me:

--- snip ---
$ cat snowman.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-

import unicodedata

snowman = u'?'

print len(snowman)
print unicodedata.name(snowman)
$ python2.6 snowman.py
1
SNOWMAN
--- snip ---

What did you set the encoding to in the declaration at the top of the
file? The help text you quoted uses latin-1 as an example, an encoding
which, of course, only supports 256 code points. Did you try utf-8 instead?

The regular expression engine's Unicode support is a different question,
and I do not know the answer.

By the way, Python 2.x only supports using non-ASCII characters in
source code in string literals. Python 3 adds support for Unicode
identifiers (e.g. variable names, function argument names, etc.).
-- 


From runarte at start.no  Sun May  3 07:53:46 2009
From: runarte at start.no (Runar Tenfjord)
Date: Sun, 3 May 2009 11:53:46 +0000 (UTC)
Subject: ANN: pyscite
Message-ID: <loom.20090503T114741-303@post.gmane.org>

ANN: pyscite released

Download it from:
http://code.google.com/p/pyscite/

What is pyscite?

Pyscite is a python module for accessing the SciTE editors Director Interface
on windows.

Example are included with code to integrate the aspell spell checker engine
with SciTE.




From flamz3d at gmail.com  Sun May  3 09:08:02 2009
From: flamz3d at gmail.com (flamz3d at gmail.com)
Date: Sun, 3 May 2009 06:08:02 -0700 (PDT)
Subject: AutoComplete in C++ Editor for Python
Message-ID: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>

Hello,
I am embedding python support in my C++ application and was looking at
adding "Intellisense" or "AutoComplete" support.

I found a way to do it using the "dir" function, but this creates a
problem. Here's why. Let's say I have the following code in my editor:

import sys
x = sys


Now, I would like to get all attributes of the object called 'x'. I
can "instrument" the code and add "print dir(x)" at the end,
temporarily redirect the python output to a string and execute the
code.

But this is not safe: I do NOT want to execute the code while the user
is typing!

Is there a way to "compile" the python code and get access to the
symbol table from that compiled block?

Did anybody ever implement AutoComplete in a editor for Python?

cheers.


From mike.blonder at gmail.com  Sun May  3 09:21:29 2009
From: mike.blonder at gmail.com (mikefromvt)
Date: Sun, 3 May 2009 06:21:29 -0700 (PDT)
Subject: Need Help with str.replace & tuples
References: <90983bf0-c21d-44f5-91c1-873c484678b9@s16g2000vbp.googlegroups.com>
	<f1ad962b-5777-46cb-8f96-277ea51aba3c@t10g2000vbg.googlegroups.com>
Message-ID: <05b72ff3-305d-4c96-bfb6-51f65ab26c43@q2g2000vbr.googlegroups.com>

On May 2, 6:22?pm, bearophileH... at lycos.com wrote:
> mikefromvt:> I am very very unfamiliar with Python and need to update a Python
> > script. ?What I need to do is to replace three variables (already
> > defined in the script) within a string. ?The present script correctly
> > replaces two of the three variables. ?I am unable to add a third
> > variable. ?Specifically, I would like to add
>
> > "panoble",panoble
> > to the following code:
> > idxItemStr+=string.replace(string.replace
>
> (idxItemTplStr,"stylenumber",stylenumber),"formalname",formalname)
>
> This isn't going to win some contest of coding style quality, but you
> may try this (for other people: I have not added any new variable name
> on purpose):
>
> idxItemStr += idxItemTplStr.replace("stylenumber",
> ? ? ? ? ? ? ? stylenumber).replace("formalname",
> ? ? ? ? ? ? ? formalname).replace("panoble", panoble)
>
> Note that in Python names are usually written like this:
> idx_item_tpl
> Instead of:
> idxItemTplStr
>
> Bye,
> bearophile

Thank you SO MUCH. It works perfectly.

Mike


From riccardo.f at email.it  Sun May  3 10:05:42 2009
From: riccardo.f at email.it (Riccardo Fadiga)
Date: Sun, 3 May 2009 16:05:42 +0200
Subject: New Module Proposal
Message-ID: <001c01c9cbf8$3fc39500$bf4abf00$@f@email.it>

Greetings,

I'm a basic python coder, and I wrote for myself a module wich has many
function regarding encryption/decryption with Caesar, Vigenere, RSA and many
more ciphers. People told me that it would be useful that it would be
included in stardard Python distribution. I'll send you a copy of the file,
just in case you decide to really do that.

Thanks for reading. Please write back.

 

Riccardo

 


 
 
 --
 Caselle da 1GB, trasmetti allegati fino a 3GB e in piu' IMAP, POP3 e SMTP autenticato? GRATIS solo con Email.it http://www.email.it/f
 
 Sponsor:
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From bruce306 at rogers.com  Sun May  3 10:26:59 2009
From: bruce306 at rogers.com (Uncle Bruce)
Date: Sun, 3 May 2009 07:26:59 -0700 (PDT)
Subject: Use of Unicode in Python 2.5 source code literals
References: <0658da84-6bcf-4689-8a5a-4b934202af08@t10g2000vbg.googlegroups.com>
	<mailman.5003.1241350672.11746.python-list@python.org>
Message-ID: <197f510f-2b7b-42b9-b5b1-14e5a71700cb@o14g2000vbo.googlegroups.com>

On May 3, 7:37?am, Matt Nordhoff <mnordh... at mattnordhoff.com> wrote:
> Uncle Bruce wrote:
<snip>
> --

I think I've figured it out!

What I was trying to do was to enter the literal strings directly into
the IDLE interpreter.  The IDLE interpreter will not accept high
codepoints directly.

However, when I put a defined function in a separate file with high
codepoints, IDLE processes them just fine!  display produced the
expected Hex strings, and Print displayed the correct characters.

Success!


From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 10:42:04 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 14:42:04 GMT
Subject: Strange interaction between timeit and recursion
Message-ID: <00198774$0$9761$c3e8da3@news.astraweb.com>

I'm seeing a strange interaction between timeit and recursion.


>>> sys.getrecursionlimit()
1000
>>> from timeit import Timer
>>> setup = """def test(n=1):
...     if n < 999: return test(n+1)
...     return None
... """
>>> exec setup
>>> test() is None
True
>>>
>>> Timer('test()', setup).repeat(number=1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/timeit.py", line 188, in repeat
    t = self.timeit(number)
  File "/usr/lib/python2.5/timeit.py", line 161, in timeit
    timing = self.inner(it, self.timer)
  File "<timeit-src>", line 9, in inner
  File "<timeit-src>", line 4, in test
  File "<timeit-src>", line 4, in test
  File "<timeit-src>", line 4, in test
  ...
  File "<timeit-src>", line 4, in test



I don't understand why my recursive function hits the recursion limit 
inside the timeit.Timer when it works outside of it.

Is there any way to see the current recursion depth at a particular 
moment?



-- 
Steven


From rose.0978 at gmail.com  Sun May  3 10:49:49 2009
From: rose.0978 at gmail.com (rose)
Date: Sun, 3 May 2009 07:49:49 -0700 (PDT)
Subject: Using Help inside Python
Message-ID: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>

Hi,
            I have an idea of the basics of programming language in
general. How to access help in python i.e. help followed by something
or to get to know about some inbuilt module or method etc. how do I
access help from within the IDLE using the help command.

Thank You.


From krmane at gmail.com  Sun May  3 11:14:29 2009
From: krmane at gmail.com (Krishnakant)
Date: Sun, 03 May 2009 20:44:29 +0530
Subject: problem with money datatype based calculations in python
In-Reply-To: <20090503032025.06428836.darcy@druid.net>
References: <mailman.4963.1241250341.11746.python-list@python.org>
	<r8vtc6-vh1.ln1@spamfence.net>
	<20090502115734.b280bf35.darcy@druid.net>
	<1241289437.3842.6.camel@kk-laptop>
	<20090503032025.06428836.darcy@druid.net>
Message-ID: <1241363669.3724.10.camel@kk-laptop>

On Sun, 2009-05-03 at 03:20 +0000, D'Arcy J.M. Cain wrote:
> Sorry, I should have mentioned my bias.  :-)
> No problems at all.  It is a very good library.  I get an impression that it is realy a mature module and a very powerful set of API. 

> > I would like to know if it has been tested with postgresql 8.3 and are
> 
> The current version of PyGreSQL has been tested with Python 2.5 and
> PostGreSQL 8.3. Older version should work as well, but you will need
> at least Python 2.3 and PostgreSQL 7.4.
> 
Ah, I am using python 2.6 and postgresql 8.3

I am really impressed with the library.  I want some manual or tutorial
for the same and if possible can you write me off the list with a small
tutorial for things like connecting to the database, sending queries,
and working with the resultset at the client site.

I will be really happy if this library also supports calling a stored
procedurs directly.  Psycopg2 does not have such a feature and I had to
create one small module which does that work.

What it does is that you just give the name of the procuedure procedure
as the first parameter and a list of arguements as the second parameter.
That's all, you will get the result because the query  for the call is
created inside the module and the programmer need not worry about what
the sored procedure looks like.

Never the less I am expecting that pygresql has some infrastructure for
making calls to the stored procedures.  Please send me some tutorial off
the list.

happy hacking.
Krishnakant.




From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 11:15:25 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 15:15:25 GMT
Subject: Using Help inside Python
References: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>
Message-ID: <00198f45$0$9761$c3e8da3@news.astraweb.com>

On Sun, 03 May 2009 07:49:49 -0700, rose wrote:

> Hi,
>             I have an idea of the basics of programming language in
> general. How to access help in python i.e. help followed by something or
> to get to know about some inbuilt module or method etc. how do I access
> help from within the IDLE using the help command.
> 
> Thank You.

At the prompt, type any of:

help()

help(module)

help(function)

help(any_object)

help("keyword")  # note the quotes around the keyword

then hit Enter to get help about that object or keyword.


-- 
Steven


From icebergwtf at gmail.com  Sun May  3 11:18:33 2009
From: icebergwtf at gmail.com (tiefeng wu)
Date: Sun, 3 May 2009 23:18:33 +0800
Subject: smtplib send email by using gmail smtp server
Message-ID: <4314c1f70905030818y73809e16s45e04f8edb5ce714@mail.gmail.com>

Hi all

I'm tring send email using smtp.gmail.com

here's the code:

*s = SMTP('**smtp.gmail.com* <http://smtp.gmail.com/>*', 25)
s.set_debuglevel(1)*
*s.ehlo()
s.starttls()
s.ehlo()
s.login(mygmailaccount, mygmailpassword)
s.sendmail(from_addr, to_addr_list, message)
s.close()*

I got the following:

*send: 'ehlo [192.168.1.104]\r\n'
reply: b'**250-mx.google.com* <http://250-mx.google.com/>* at your service,
[58.39.112.163]\r\n'
reply: b'250-SIZE 35651584\r\n'
reply: b'250-8BITMIME\r\n'
reply: b'250-STARTTLS\r\n'
reply: b'250-ENHANCEDSTATUSCODES\r\n'
reply: b'250 PIPELINING\r\n'
reply: retcode (250); Msg: b'**mx.google.com* <http://mx.google.com/>* at
your service, [58.39.112.163]\nSIZE 35651584\n8BITMIME\nSTARTTLS\nENHANCED
STATUSCODES\nPIPELINING'
send: 'STARTTLS\r\n'
reply: b'220 2.0.0 Ready to start TLS\r\n'
reply: retcode (220); Msg: b'2.0.0 Ready to start TLS'*

After a long time waiting I got:

*Traceback (most recent call last):
...
  File "sendmail.py", line 56, in send_mail
    s.starttls()
  File "C:\usr\bin\python30\lib\smtplib.py", line 619, in starttls
    self.sock = ssl.wrap_socket(self.sock, keyfile, certfile)
  File "C:\usr\bin\python30\lib\ssl.py", line 381, in wrap_socket
    suppress_ragged_eofs=suppress_ragged_eofs)
  File "C:\usr\bin\python30\lib\ssl.py", line 135, in __init__
    raise x
  File "C:\usr\bin\python30\lib\ssl.py", line 131, in __init__
    self.do_handshake()
  File "C:\usr\bin\python30\lib\ssl.py", line 327, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [Errno 8] _ssl.c:486: EOF occurred in violation of protocol*

After this I tried port 465, I got no debug messages like "send...
reply...", and after a long time waiting the following exception occured:

*Traceback (most recent call last):
...*
*  File "sendmail.py", line 49, in send_mail
    s = SMTP('smtp.gmail.com', 465)
  File "C:\usr\bin\python30\lib\smtplib.py", line 239, in __init__
    (code, msg) = self.connect(host, port)
  File "C:\usr\bin\python30\lib\smtplib.py", line 296, in connect
    (code, msg) = self.getreply()
  File "C:\usr\bin\python30\lib\smtplib.py", line 342, in getreply
    raise SMTPServerDisconnected("Connection unexpectedly closed")
smtplib.SMTPServerDisconnected: Connection unexpectedly closed*

Am I doing something wrong? I'm using python30 and python31a2 under Windows
XP

thanks!

Tiefeng Wu
2009-05-03
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From deets at nospam.web.de  Sun May  3 11:59:41 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 03 May 2009 17:59:41 +0200
Subject: Strange interaction between timeit and recursion
In-Reply-To: <00198774$0$9761$c3e8da3@news.astraweb.com>
References: <00198774$0$9761$c3e8da3@news.astraweb.com>
Message-ID: <765tbdF1be7kpU1@mid.uni-berlin.de>

Steven D'Aprano schrieb:
> I'm seeing a strange interaction between timeit and recursion.
> 
> 
>>>> sys.getrecursionlimit()
> 1000
>>>> from timeit import Timer
>>>> setup = """def test(n=1):
> ...     if n < 999: return test(n+1)
> ...     return None
> ... """
>>>> exec setup
>>>> test() is None
> True
>>>> Timer('test()', setup).repeat(number=1)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.5/timeit.py", line 188, in repeat
>     t = self.timeit(number)
>   File "/usr/lib/python2.5/timeit.py", line 161, in timeit
>     timing = self.inner(it, self.timer)
>   File "<timeit-src>", line 9, in inner
>   File "<timeit-src>", line 4, in test
>   File "<timeit-src>", line 4, in test
>   File "<timeit-src>", line 4, in test
>   ...
>   File "<timeit-src>", line 4, in test
> 
> 
> 
> I don't understand why my recursive function hits the recursion limit 
> inside the timeit.Timer when it works outside of it.
> 
> Is there any way to see the current recursion depth at a particular 
> moment?

import inspect

def rec(count=100):
     if not count:
         return
     print len(inspect.getouterframes(inspect.currentframe()))
     rec(count-1)

rec()

Diez


From david at boddie.org.uk  Sun May  3 12:40:27 2009
From: david at boddie.org.uk (David Boddie)
Date: Sun, 03 May 2009 18:40:27 +0200
Subject: stuck with PyOBEX
References: <gt78o7$i9n$1@ss408.t-com.hr> <75opebF19fc22U1@mid.uni-berlin.de>
	<gt80qd$mbf$1@get-news01.get.basefarm.net>
	<gt8pbj$j3o$1@ss408.t-com.hr>
	<gtatk5$pff$1@get-news01.get.basefarm.net>
	<gthe40$87q$1@ss408.t-com.hr>
	<gthm2m$sdr$1@get-news01.get.basefarm.net>
	<gtjktg$ai0$1@ss408.t-com.hr>
Message-ID: <gtkhdr$obj$1@get-news01.get.basefarm.net>

On Sunday 03 May 2009 10:33, alejandro wrote:

> Yes!
> 
>> I'll send you an updated version to try if you would like to test it.

My mails to you keep getting returned, so I've put it here:

http://www.boddie.org.uk/david/Projects/Python/PyOBEX/Software/PyOBEX-0.21.zip

Please let me know if it works on Windows, and feel free to get in touch if
you have any problems.

David


From subhakolkata1234 at gmail.com  Sun May  3 12:51:13 2009
From: subhakolkata1234 at gmail.com (SUBHABRATA BANERJEE)
Date: Sun, 3 May 2009 22:21:13 +0530
Subject: File handling problem.
In-Reply-To: <49FC0864.5080309@wanadoo.fr>
References: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>
	<49FC0864.5080309@wanadoo.fr>
Message-ID: <97c638a50905030951w61639bc9g18f0d378382bd8@mail.gmail.com>

Dear Group,



I am working on a code like the following:



from decimal import*

#SAMPLE TEST PROGRAM FOR FILE

def sample_file_test(n):

    #FILE FOR STORING PROBABILITY VALUES

    open_file=open("/python26/Newfile1.txt","r+")

    #OPENING OF ENGLISH CORPUS

    open_corp_eng=open("/python26/TOTALENGLISHCORPUS1.txt","r")

    #READING THE ENGLISH CORPUS

    corp_read=open_corp_eng.read()

    #CONVERTING THE CORPUS FILE IN WORDS

    corp_word=corp_read.split()

    #EXTRACTING WORDS FROM CORPUS FILE OF WORDS

    for word in corp_word:

        #COUNTING THE WORD

        count1=corp_word.count(word)

        #COUNTING TOTAL NUMBER OF WORDS

        count2=len(corp_word)

        #COUNTING PROBABILITY OF WORD

        count1_dec=Decimal(count1)

        count2_dec=Decimal(count2)

        getcontext().prec = 6

        prob_count=count1_dec/count2_dec

        print prob_count

        string_of_prob_count=str(prob_count)

        file_input_val=open_file.write(string_of_prob_count)

        open_file.close()



The problems I am getting:

(i)                  The probability values are not being stored properly in
file.

(ii)                ?Newfile1.txt? is storing not the series of values but
an arbitrary value from series 0.00000143096

(iii)               As I was testing it again it gave me another error

Traceback (most recent call last):

  File "<pyshell#2>", line 1, in <module>

    sample_file_test(1)

  File "C:\Python26\testprogramforfiles1.py", line 25, in sample_file_test

    file_input_val=open_file.write(string_of_prob_count)

ValueError: I/O operation on closed file



If you can kindly let me know what is the wrong I am doing here.



As I took out the code pasted it in MS-Word before posting, there may be
slight indentation problem.



Best Regards,

Subhabrata.




On Sat, May 2, 2009 at 2:16 PM, Pascal Chambon <chambon.pascal at wanadoo.fr>wrote:

> subhakolkata1234 at gmail.com a ?crit :
>
>>  Dear Group,
>>
>> I am using Python2.6 and has created a file where I like to write some
>> statistical values I am generating. The statistical values are
>> generating in a nice way, but as I am going to write it, it is not
>> taking it, the file is opening or closing properly but the values are
>> not getting stored. It is picking up arbitrary values from the
>> generated set of values and storing it. Is there any solution for it?
>>
>> Best Regards,
>> SBanerjee.
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>>
>>
> Hello
>
> Could you post excerpt of your file-handling code ?
> It might be a buffering problem (although when the file closes, I think
> buffers get flushed), else it's really weird...
>
> Regards,
> pascal
>
>
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From aahz at pythoncraft.com  Sun May  3 12:51:13 2009
From: aahz at pythoncraft.com (Aahz)
Date: 3 May 2009 09:51:13 -0700
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com>
	<b51e6b3a-3219-4b56-9b36-6494c059c761@y10g2000prc.googlegroups.com>
	<75e47cc6-72bc-4941-802e-767f2187445f@d7g2000prl.googlegroups.com>
	<7744f434-dd43-4010-ba25-90096f59d1d9@n7g2000prc.googlegroups.com>
Message-ID: <gtki21$2bk$1@panix3.panix.com>

In article <7744f434-dd43-4010-ba25-90096f59d1d9 at n7g2000prc.googlegroups.com>,
CTO  <debatem1 at gmail.com> wrote:
>
>I will admit, I have *no idea* what that code is doing, but in looking
>through the gc module documentation, I'm seeing the gc.get_objects
>function. Would it be equivalent to what the OP is asking to track the
>size of every element returned by that?

Perhaps.  gc.get_objects() only returns objects tracked by GC (i.e.
containers).  You would need to also check all the object references
held by the containers.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Typing is cheap.  Thinking is expensive."  --Roy Smith


From koranthala at gmail.com  Sun May  3 12:54:11 2009
From: koranthala at gmail.com (koranthala)
Date: Sun, 3 May 2009 09:54:11 -0700 (PDT)
Subject: Reg: MFC71.DLL
Message-ID: <e4979cf9-15ce-4876-9dfb-bf0025e2cc86@d39g2000pra.googlegroups.com>

Hi,
   I had written a python 2.4 program. When I made it to an executable
with py2exe, it told that the mfc71.dll is not added - so I may have
to ship it separately. It also showed many other dll's which are all
in windows/system32 - which again it said is not added.
   Now, I have two questions -
  (1) Should I include mfc71.dll separately? - I found in the
following dicsussion -
http://groups.google.com/group/comp.lang.python/browse_thread/thread/96933f0b9a1a0f12/887675601f5c5c63
- that mfc71 might not be needed. Should I ship it separately?
  (2) The dlls in windows/system32 - do I need to ship it separately?

Koran


From clp2 at rebertia.com  Sun May  3 13:17:22 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 3 May 2009 10:17:22 -0700
Subject: File handling problem.
In-Reply-To: <97c638a50905030951w61639bc9g18f0d378382bd8@mail.gmail.com>
References: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>
	<49FC0864.5080309@wanadoo.fr>
	<97c638a50905030951w61639bc9g18f0d378382bd8@mail.gmail.com>
Message-ID: <50697b2c0905031017k10cc564dj6e575eaa150916f@mail.gmail.com>

On Sun, May 3, 2009 at 9:51 AM, SUBHABRATA BANERJEE
<subhakolkata1234 at gmail.com> wrote:
> Dear Group,
>
>
>
> I am working on a code like the following:
>
>
>
> from decimal import*
>
> #SAMPLE TEST PROGRAM FOR FILE
>
> def sample_file_test(n):
>
> ??? #FILE FOR STORING PROBABILITY VALUES
>
> ??? open_file=open("/python26/Newfile1.txt","r+")

Is there a reason you must output the results to the same file the
input came from? It's possible this is part of your problems.

>
> ??? #OPENING OF ENGLISH CORPUS
>
> ??? open_corp_eng=open("/python26/TOTALENGLISHCORPUS1.txt","r")
>
> ??? #READING THE ENGLISH CORPUS
>
> ??? corp_read=open_corp_eng.read()
>
> ??? #CONVERTING THE CORPUS FILE IN WORDS
>
> ??? corp_word=corp_read.split()
>
> ??? #EXTRACTING WORDS FROM CORPUS FILE OF WORDS
>
> ??? for word in corp_word:
>
> ??????? #COUNTING THE WORD
>
> ??????? count1=corp_word.count(word)

Note: Your program is currently O(N^2) rather than O(N) because you
re-count the number of occurrences of each word /on every occurrence
of the word/.

> ??????? #COUNTING TOTAL NUMBER OF WORDS
>
> ??????? count2=len(corp_word)
>
> ??????? #COUNTING PROBABILITY OF WORD
>
> ??????? count1_dec=Decimal(count1)
>
> ??????? count2_dec=Decimal(count2)
>
> ??????? getcontext().prec = 6
>
> ??????? prob_count=count1_dec/count2_dec
>
> ??????? print prob_count
>
> ??????? string_of_prob_count=str(prob_count)
>
> ??????? file_input_val=open_file.write(string_of_prob_count)
>
> ??????? open_file.close()

You shouldn't be closing the file until the /entire loop/ has finished
writing to the file. So the previous line should be dedented.

>
>
>
> The problems I am getting:
>
> (i)????????????????? The probability values are not being stored properly in
> file.

Also, you're currently not putting any separator between consecutive
entires, so it's all going to run together as one long line.
Have you considered using one of the std lib modules to output the
file in a well-defined human-readable format such as JSON or CSV?

> (ii)??????????????? ?Newfile1.txt? is storing not the series of values but
> an arbitrary value from series 0.00000143096
>
> (iii)?????????????? As I was testing it again it gave me another error
>
> Traceback (most recent call last):
>
> ? File "<pyshell#2>", line 1, in <module>
>
> ??? sample_file_test(1)
>
> ? File "C:\Python26\testprogramforfiles1.py", line 25, in sample_file_test
>
> ??? file_input_val=open_file.write(string_of_prob_count)
>
> ValueError: I/O operation on closed file


Cheers,
Chris
-- 
http://blog.rebertia.com


From debatem1 at gmail.com  Sun May  3 13:29:36 2009
From: debatem1 at gmail.com (CTO)
Date: Sun, 3 May 2009 10:29:36 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<b51e6b3a-3219-4b56-9b36-6494c059c761@y10g2000prc.googlegroups.com> 
	<75e47cc6-72bc-4941-802e-767f2187445f@d7g2000prl.googlegroups.com> 
	<7744f434-dd43-4010-ba25-90096f59d1d9@n7g2000prc.googlegroups.com> 
	<gtki21$2bk$1@panix3.panix.com>
Message-ID: <b639362b-cd66-492c-8af8-559ca5411582@g20g2000vba.googlegroups.com>

Alright, it's pretty obvious that I have a lot to learn before I'll be
able
to intelligently address this problem, but if somebody could point me
at
something that would help me figure out the terminology at least I'd
really
appreciate it. From what you're saying, it sounds like a combination
of the
above approaches would do what I'm asking- ie, get all the containers,
then
get the contents of each container- but I don't see why that would
work
unless gc tracks some kind of global container for small values,
which, as
I (poorly) understand it, are tracked separately?

Thanks again,
Geremy Condra



From subhakolkata1234 at gmail.com  Sun May  3 13:33:52 2009
From: subhakolkata1234 at gmail.com (SUBHABRATA BANERJEE)
Date: Sun, 3 May 2009 23:03:52 +0530
Subject: File handling problem.
In-Reply-To: <50697b2c0905031017k10cc564dj6e575eaa150916f@mail.gmail.com>
References: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>
	<49FC0864.5080309@wanadoo.fr>
	<97c638a50905030951w61639bc9g18f0d378382bd8@mail.gmail.com>
	<50697b2c0905031017k10cc564dj6e575eaa150916f@mail.gmail.com>
Message-ID: <97c638a50905031033x5ce3b500i381b5eb98b0d114d@mail.gmail.com>

Dear Sir,
Thanx for your prompt reply, I would be trying to work on your suggestion
and get back to you as soon as possible.
Best Regards,
Subhabrata.

On Sun, May 3, 2009 at 10:47 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Sun, May 3, 2009 at 9:51 AM, SUBHABRATA BANERJEE
> <subhakolkata1234 at gmail.com> wrote:
> > Dear Group,
> >
> >
> >
> > I am working on a code like the following:
> >
> >
> >
> > from decimal import*
> >
> > #SAMPLE TEST PROGRAM FOR FILE
> >
> > def sample_file_test(n):
> >
> >     #FILE FOR STORING PROBABILITY VALUES
> >
> >     open_file=open("/python26/Newfile1.txt","r+")
>
> Is there a reason you must output the results to the same file the
> input came from? It's possible this is part of your problems.
>
> >
> >     #OPENING OF ENGLISH CORPUS
> >
> >     open_corp_eng=open("/python26/TOTALENGLISHCORPUS1.txt","r")
> >
> >     #READING THE ENGLISH CORPUS
> >
> >     corp_read=open_corp_eng.read()
> >
> >     #CONVERTING THE CORPUS FILE IN WORDS
> >
> >     corp_word=corp_read.split()
> >
> >     #EXTRACTING WORDS FROM CORPUS FILE OF WORDS
> >
> >     for word in corp_word:
> >
> >         #COUNTING THE WORD
> >
> >         count1=corp_word.count(word)
>
> Note: Your program is currently O(N^2) rather than O(N) because you
> re-count the number of occurrences of each word /on every occurrence
> of the word/.
>
> >         #COUNTING TOTAL NUMBER OF WORDS
> >
> >         count2=len(corp_word)
> >
> >         #COUNTING PROBABILITY OF WORD
> >
> >         count1_dec=Decimal(count1)
> >
> >         count2_dec=Decimal(count2)
> >
> >         getcontext().prec = 6
> >
> >         prob_count=count1_dec/count2_dec
> >
> >         print prob_count
> >
> >         string_of_prob_count=str(prob_count)
> >
> >         file_input_val=open_file.write(string_of_prob_count)
> >
> >         open_file.close()
>
> You shouldn't be closing the file until the /entire loop/ has finished
> writing to the file. So the previous line should be dedented.
>
> >
> >
> >
> > The problems I am getting:
> >
> > (i)                  The probability values are not being stored properly
> in
> > file.
>
> Also, you're currently not putting any separator between consecutive
> entires, so it's all going to run together as one long line.
> Have you considered using one of the std lib modules to output the
> file in a well-defined human-readable format such as JSON or CSV?
>
> > (ii)                ?Newfile1.txt? is storing not the series of values
> but
> > an arbitrary value from series 0.00000143096
> >
> > (iii)               As I was testing it again it gave me another error
> >
> > Traceback (most recent call last):
> >
> >   File "<pyshell#2>", line 1, in <module>
> >
> >     sample_file_test(1)
> >
> >   File "C:\Python26\testprogramforfiles1.py", line 25, in
> sample_file_test
> >
> >     file_input_val=open_file.write(string_of_prob_count)
> >
> > ValueError: I/O operation on closed file
>
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>
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From gagsl-py2 at yahoo.com.ar  Sun May  3 14:08:55 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 03 May 2009 15:08:55 -0300
Subject: smtplib send email by using gmail smtp server
References: <4314c1f70905030818y73809e16s45e04f8edb5ce714@mail.gmail.com>
Message-ID: <op.utc8o5g6x6zn5v@gabriel.sleipnir-bsas>

En Sun, 03 May 2009 12:18:33 -0300, tiefeng wu <icebergwtf at gmail.com>  
escribi?:

> I'm tring send email using smtp.gmail.com
>
> here's the code:
>
> *s = SMTP('**smtp.gmail.com* <http://smtp.gmail.com/>*', 25)
> s.set_debuglevel(1)*
> *s.ehlo()
> s.starttls()
> s.ehlo()
> s.login(mygmailaccount, mygmailpassword)
> s.sendmail(from_addr, to_addr_list, message)
> s.close()*

I've tested with 3.0.1 on Windows XP and worked fine. Seems to be a  
problem in the SSL support, but that's all I could say.

-- 
Gabriel Genellina



From davea at ieee.org  Sun May  3 15:14:13 2009
From: davea at ieee.org (Dave Angel)
Date: Sun, 03 May 2009 15:14:13 -0400
Subject: AutoComplete in C++ Editor for Python
In-Reply-To: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>
References: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>
Message-ID: <49FDED05.5080802@ieee.org>

flamz3d at gmail.com wrote:
> Hello,
> I am embedding python support in my C++ application and was looking at
> adding "Intellisense" or "AutoComplete" support.
>
> I found a way to do it using the "dir" function, but this creates a
> problem. Here's why. Let's say I have the following code in my editor:
>
> import sys
> x = sys
>
>
> Now, I would like to get all attributes of the object called 'x'. I
> can "instrument" the code and add "print dir(x)" at the end,
> temporarily redirect the python output to a string and execute the
> code.
>
> But this is not safe: I do NOT want to execute the code while the user
> is typing!
>
> Is there a way to "compile" the python code and get access to the
> symbol table from that compiled block?
>
> Did anybody ever implement AutoComplete in a editor for Python?
>
> cheers.
>
>   
Several editors for Python support auto-complete, to one extent or 
another.  The only one I have experience with is Komodo.  Komodo runs in 
a separate process, so it doesn't suffer from the problems of having two 
gui event-loops in the same process, and other similar problems.   It 
also won't be executing code that might have side effects in the child 
process.

The downside is that in order to do auto-complete, it has to figure it 
out from other clues.  From the docs, and from reading, and from 
experiementing, I believe that it uses two approaches.  One approach is 
a set of language files which try to describe all the symbols in the 
standard language and library.  They have one for each release (2.4, 
2.5, ...)  Theoretically, you could add your own for other libraries.  
Second approach is to parse the code that's visible to it.  That parsing 
is well done, and surprisingly quick, but there are lots of tricks a 
developer might use that can fool it.  For example, wxPython lets you 
import just one symbol, and lots more appear magically.  It's no big 
deal, they have code structured one way, but the interface is very 
different.  Catch is that code completion frequently gets fooled by these.

I'd point out that if you do walk the dictionaries at run time, you'll 
get different results when you do it with nothing running than if you do 
a strictly static analysis.  So some things might only show up if you've 
stepped into the function with the magic going on.

Simplest example I can come up with of something a static analysis won't 
spot:   An instance object    obj   may have some number of attributes 
assigned the the __init__() method.  But it could also have new fields 
added by anyone with a referent into it.

There is a Python parser in module ast.  Perhaps that'd be some help.  
I've not used it, so can't give you any specifics.


DaveA


From cdalten at gmail.com  Sun May  3 15:41:28 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sun, 3 May 2009 12:41:28 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
Message-ID: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>

Let's say there is a new zip file with updated information every 30
minutes on a remote website. Now, I wanna connect to this website
every 30 minutes, download the file, extract the information, and then
have the program search the file search for certain items.

Would it be better to use threads to break this up? I have one thread
download the data and then have another to actually process the data .
Or would it be better to use fork?



From deets at nospam.web.de  Sun May  3 16:16:49 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 03 May 2009 22:16:49 +0200
Subject: Is it better to use threads or fork in the following case
In-Reply-To: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
Message-ID: <766cdhF1bk2ipU1@mid.uni-berlin.de>

grocery_stocker schrieb:
> Let's say there is a new zip file with updated information every 30
> minutes on a remote website. Now, I wanna connect to this website
> every 30 minutes, download the file, extract the information, and then
> have the program search the file search for certain items.
> 
> Would it be better to use threads to break this up? I have one thread
> download the data and then have another to actually process the data .
> Or would it be better to use fork?

Neither. Why do you think you need concurrency at all?

Diez



From rose.0978 at gmail.com  Sun May  3 16:21:49 2009
From: rose.0978 at gmail.com (rose)
Date: Sun, 3 May 2009 13:21:49 -0700 (PDT)
Subject: Using Help inside Python
References: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>
	<00198f45$0$9761$c3e8da3@news.astraweb.com>
Message-ID: <465fe83f-3269-4fa3-8d6a-75799254e1ba@z8g2000prd.googlegroups.com>

On May 3, 8:15?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sun, 03 May 2009 07:49:49 -0700, rose wrote:
> > Hi,
> > ? ? ? ? ? ? I have an idea of the basics of programming language in
> > general. How to access help in python i.e. help followed by something or
> > to get to know about some inbuilt module or method etc. how do I access
> > help from within the IDLE using the help command.
>
> > Thank You.
>
> At the prompt, type any of:
>
> help()
>
> help(module)
>
> help(function)
>
> help(any_object)
>
> help("keyword") ?# note the quotes around the keyword
>
> then hit Enter to get help about that object or keyword.
>
> --
> Steven

Many Thanks to you Steven, for such a concise explanation of using the
help. May I request some examples to make it a bit more explicit.


From cdalten at gmail.com  Sun May  3 16:29:38 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sun, 3 May 2009 13:29:38 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
Message-ID: <5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>

On May 3, 1:16 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> grocery_stocker schrieb:
>
> > Let's say there is a new zip file with updated information every 30
> > minutes on a remote website. Now, I wanna connect to this website
> > every 30 minutes, download the file, extract the information, and then
> > have the program search the file search for certain items.
>
> > Would it be better to use threads to break this up? I have one thread
> > download the data and then have another to actually process the data .
> > Or would it be better to use fork?
>
> Neither. Why do you think you need concurrency at all?
>

Okay, here is what was going through my mind. I'm a 56k dialup modem.
What happens it takes me 15 minutes to download the file? Now let's
say during those 15 minutes, the program needs to parse the data in
the existing file.



From deets at nospam.web.de  Sun May  3 16:40:27 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 03 May 2009 22:40:27 +0200
Subject: Is it better to use threads or fork in the following case
In-Reply-To: <5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
Message-ID: <766dprF1bc1asU1@mid.uni-berlin.de>

grocery_stocker schrieb:
> On May 3, 1:16 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>> grocery_stocker schrieb:
>>
>>> Let's say there is a new zip file with updated information every 30
>>> minutes on a remote website. Now, I wanna connect to this website
>>> every 30 minutes, download the file, extract the information, and then
>>> have the program search the file search for certain items.
>>> Would it be better to use threads to break this up? I have one thread
>>> download the data and then have another to actually process the data .
>>> Or would it be better to use fork?
>> Neither. Why do you think you need concurrency at all?
>>
> 
> Okay, here is what was going through my mind. I'm a 56k dialup modem.
> What happens it takes me 15 minutes to download the file? Now let's
> say during those 15 minutes, the program needs to parse the data in
> the existing file.

Is this an exercise in asking 20 hypothetical questions?

Getting concurrency right isn't trivial, so if you absolute don't need 
this, don't do it.

Diez


From zentraders at gmail.com  Sun May  3 16:41:49 2009
From: zentraders at gmail.com (Zentrader)
Date: Sun, 3 May 2009 13:41:49 -0700 (PDT)
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
Message-ID: <930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>

There is no need for a function or a generator.  A for() loop is a
unique case of a while loop
## for i in range(-10.5, 10.5, 0.1):
ctr = -10.5
while ctr < 10.5:
   print ctr
   ctr += 0.1


From debatem1 at gmail.com  Sun May  3 16:44:32 2009
From: debatem1 at gmail.com (CTO)
Date: Sun, 3 May 2009 13:44:32 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
Message-ID: <477fce8b-98b6-46c8-a839-496a17cb5032@s28g2000vbp.googlegroups.com>

Probably better just to check HEAD and see if its updated within the
time you're
looking at before any unpack. Even on a 56k that's going to be pretty
fast, and
you don't risk unpacking an old file while a new version is on the
way.

If you still want to be able to unpack the old file if there's an
update then
you're probably right about needing to run it concurrently, and
personally I'd
just fork it for ease of use- it doesn't sound like you're trying to
run 100,000
of these at the same time, and you're saving the file anyway.

Geremy Condra



From paul.hankin at gmail.com  Sun May  3 16:45:36 2009
From: paul.hankin at gmail.com (Paul Hankin)
Date: Sun, 3 May 2009 13:45:36 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
Message-ID: <bea7d12e-2bda-4ec6-868b-440b79bd28e4@21g2000vbk.googlegroups.com>

On May 3, 10:29?pm, grocery_stocker <cdal... at gmail.com> wrote:
> On May 3, 1:16 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> > grocery_stocker schrieb:
>
> > > Let's say there is a new zip file with updated information every 30
> > > minutes on a remote website. Now, I wanna connect to this website
> > > every 30 minutes, download the file, extract the information, and then
> > > have the program search the file search for certain items.
>
> > > Would it be better to use threads to break this up? I have one thread
> > > download the data and then have another to actually process the data .
> > > Or would it be better to use fork?
>
> > Neither. Why do you think you need concurrency at all?
>
> Okay, here is what was going through my mind. I'm a 56k dialup modem.
> What happens it takes me 15 minutes to download the file? Now let's
> say during those 15 minutes, the program needs to parse the data in
> the existing file.

If your modem is going at full speed for those 15 minutes, you'll have
around 6.3Mb of data. Even after decompressing, and unless the data is
in some quite difficult to parse format, it'll take seconds to
process.

--
Paul Hankin


From google at mrabarnett.plus.com  Sun May  3 16:52:26 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 03 May 2009 21:52:26 +0100
Subject: for with decimal values?
In-Reply-To: <930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
Message-ID: <49FE040A.8010600@mrabarnett.plus.com>

Zentrader wrote:
> There is no need for a function or a generator.  A for() loop is a
> unique case of a while loop
> ## for i in range(-10.5, 10.5, 0.1):
> ctr = -10.5
> while ctr < 10.5:
>    print ctr
>    ctr += 0.1
> 
Python stores floats in binary, and 0.1 can't be held exactly as a
fractional binary number. Therefore it might be better to produce the
values as integers divided by 10:

for i in range(-105, 105):
     i = i / 10.0
     # do stuff here using i


From cdalten at gmail.com  Sun May  3 16:59:11 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sun, 3 May 2009 13:59:11 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
	<766dprF1bc1asU1@mid.uni-berlin.de>
Message-ID: <58b1d8d5-aee0-4ae0-8310-4ae8d430dddd@d38g2000prn.googlegroups.com>

On May 3, 1:40 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> grocery_stocker schrieb:
>
>
>
> > On May 3, 1:16 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> >> grocery_stocker schrieb:
>
> >>> Let's say there is a new zip file with updated information every 30
> >>> minutes on a remote website. Now, I wanna connect to this website
> >>> every 30 minutes, download the file, extract the information, and then
> >>> have the program search the file search for certain items.
> >>> Would it be better to use threads to break this up? I have one thread
> >>> download the data and then have another to actually process the data .
> >>> Or would it be better to use fork?
> >> Neither. Why do you think you need concurrency at all?
>
> > Okay, here is what was going through my mind. I'm a 56k dialup modem.
> > What happens it takes me 15 minutes to download the file? Now let's
> > say during those 15 minutes, the program needs to parse the data in
> > the existing file.
>
> Is this an exercise in asking 20 hypothetical questions?
>

No. This the prelude to me writing a real life python program.


From gagsl-py2 at yahoo.com.ar  Sun May  3 17:38:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 03 May 2009 18:38:56 -0300
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
	<bea7d12e-2bda-4ec6-868b-440b79bd28e4@21g2000vbk.googlegroups.com>
Message-ID: <op.utdhu31ux6zn5v@gabriel.sleipnir-bsas>

En Sun, 03 May 2009 17:45:36 -0300, Paul Hankin <paul.hankin at gmail.com>
escribi?:
> On May 3, 10:29?pm, grocery_stocker <cdal... at gmail.com> wrote:
>> On May 3, 1:16 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>> > grocery_stocker schrieb:

>> > > Would it be better to use threads to break this up? I have one  
>> thread
>> > > download the data and then have another to actually process the  
>> data .
>> > > Or would it be better to use fork?
>>
>> > Neither. Why do you think you need concurrency at all?
>>
>> Okay, here is what was going through my mind. I'm a 56k dialup modem.
>> What happens it takes me 15 minutes to download the file? Now let's
>> say during those 15 minutes, the program needs to parse the data in
>> the existing file.
>
> If your modem is going at full speed for those 15 minutes, you'll have
> around 6.3Mb of data. Even after decompressing, and unless the data is
> in some quite difficult to parse format, it'll take seconds to
> process.

In addition, the zip file format stores the directory at the end of the  
file. So you can't process it until it's completely downloaded.  
Concurrency doesn't help here.

-- 
Gabriel Genellina



From debatem1 at gmail.com  Sun May  3 17:47:27 2009
From: debatem1 at gmail.com (CTO)
Date: Sun, 3 May 2009 14:47:27 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
	<bea7d12e-2bda-4ec6-868b-440b79bd28e4@21g2000vbk.googlegroups.com> 
	<mailman.5014.1241386734.11746.python-list@python.org>
Message-ID: <4b87a84a-eef0-42cb-91f7-6ade662bdd4d@t10g2000vbg.googlegroups.com>

> In addition, the zip file format stores the directory at the end of the ?
> file. So you can't process it until it's completely downloaded. ?
> Concurrency doesn't help here.

Don't think that's relevant, if I'm understanding the OP correctly.
Lets say you've downloaded the file once and you're doing whatever
the app does with it. Now, while that's happening the half an hour
time limit comes up. Now you want to start another download, but
you also want to continue to work with the old version. Voila,
concurrency.



From martin.hellwig at dcuktec.org  Sun May  3 18:14:19 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sun, 03 May 2009 23:14:19 +0100
Subject: Is it better to use threads or fork in the following case
In-Reply-To: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
Message-ID: <xZOdnVOmOICgimPUnZ2dnUVZ8tqdnZ2d@bt.com>

grocery_stocker wrote:
> Let's say there is a new zip file with updated information every 30
> minutes on a remote website. Now, I wanna connect to this website
> every 30 minutes, download the file, extract the information, and then
> have the program search the file search for certain items.
> 
> Would it be better to use threads to break this up? I have one thread
> download the data and then have another to actually process the data .
> Or would it be better to use fork?
> 

I concur with Diez that I don't think threading/forking will bring 
significant advantages for this particular case.

That said, if you are thinking from a responsiveness perspective, I 
would definitely say threading.

If you ask from a performance perspective I would need to know what OS 
you are running (that is is if forking is even supported) and if you 
have multiple CPU's and if you are actually planning on spawning that 
sub-process on a (possibly) a different CPU as the parent process.

So the workflow would be something like this:
Downloading block
If block has enough data to process, spawn a new process (using 
multiprocessing module) and let it write the result back to x (requiring 
lock and release).

Things to keep in mind, is the overhead of:
- Multiple interpreters running on the multiple CPU's
- IPC
- Locking/Releasing
Still less then if you would have no threading at all?

About forking, this usually means that the child process starts out as 
an exact copy of the parent process and runs ideally mostly independent 
of the parent meaning that the best case would be that the child process 
can run fine without the presents of the parent process, is this really 
what you want to do?

-- 
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'


From bearophileHUGS at lycos.com  Sun May  3 18:39:47 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sun, 3 May 2009 15:39:47 -0700 (PDT)
Subject: Self function
Message-ID: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>

Sometimes I rename recursive functions, or I duplicate&modify them,
and they stop working because inside them there's one or more copy of
their old name.
This happens to me more than one time every year.
So I have written this:

from inspect import getframeinfo, currentframe

def SOMEVERYUGLYNAME(n):
    if n <= 1:
        return 1
    else:
        self_name = getframeinfo(currentframe()).function
        #self_name = getframeinfo(currentframe())[2] # older python

        # only if it's a global function
        #return n * globals()[self_name](n - 1)
        return n * eval(self_name + "(%d)" % (n - 1))
assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6

Are there nicer ways to do that? I don't know.
If there aren't, then a way may be added.
An idea-syntax:

def fact(n):
    return 1 if n <= 1 else n * inspect.self(n - 1)

Or even a lambda, because you don't need the name anymore to call the
function:

fact = lambda n: 1 if n <= 1 else n * self(n - 1)

(If you have two or more recursive functions that call each other this
idea can't be used, but I think such situations are uncommon enough to
not deserve help from the language).

Bye,
bearophile


From rhodri at wildebst.demon.co.uk  Sun May  3 19:00:42 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 04 May 2009 00:00:42 +0100
Subject: Using Help inside Python
In-Reply-To: <465fe83f-3269-4fa3-8d6a-75799254e1ba@z8g2000prd.googlegroups.com>
References: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>
	<00198f45$0$9761$c3e8da3@news.astraweb.com>
	<465fe83f-3269-4fa3-8d6a-75799254e1ba@z8g2000prd.googlegroups.com>
Message-ID: <op.utdl7g2ha8ncjz@gnudebst>

On Sun, 03 May 2009 21:21:49 +0100, rose <rose.0978 at gmail.com> wrote:

> On May 3, 8:15?pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> On Sun, 03 May 2009 07:49:49 -0700, rose wrote:
>> > Hi,
>> > ? ? ? ? ? ? I have an idea of the basics of programming language in
>> > general. How to access help in python i.e. help followed by something  
>> or
>> > to get to know about some inbuilt module or method etc. how do I  
>> access
>> > help from within the IDLE using the help command.
>>
>> > Thank You.
>>
>> At the prompt, type any of:
>>
>> help()
>>
>> help(module)
>>
>> help(function)
>>
>> help(any_object)
>>
>> help("keyword") ?# note the quotes around the keyword
>>
>> then hit Enter to get help about that object or keyword.

>
> Many Thanks to you Steven, for such a concise explanation of using the
> help. May I request some examples to make it a bit more explicit.

I'll try and expand on Steven's examples a bit, but really

>>> help()

gives you quite a lot of the information anyway.  If you want help on
the "for" keyword, for example, type:

>>> help("for")

(As Steven said, note the quote marks.)  If you want help on anything
else in Python at all, be it a function, module or object, then stick
that object in the brackets.  Thus:

>>> help(123)

tells you all about Python's integers, while

>>> l = [1, 2, 3]
>>> help(l)

tells you about lists.

The only gotcha is that if you try getting help on a string object,
it thinks that you're trying to look up a keyword.  In other words:

>>> s = "for"
>>> help(s)

and

>>> help("for")

get the same message.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From norseman at hughes.net  Sun May  3 19:13:32 2009
From: norseman at hughes.net (norseman)
Date: Sun, 03 May 2009 16:13:32 -0700
Subject: Tkinter, Trouble with Message,Label widget
Message-ID: <49FE251C.40103@hughes.net>


Intended action:
	Two Tkinter windows.
	W1 is complex, user interacts with program from here ONLY
	W2 is for display only, NO user interactions

I can get info to W2.
But to get it to update I first have to manually kill it.
Program does create both. Both terminate when programs says.
I want to post 'verbal' (text) progress reports to W2 and I want it to 
self update at posting. (Or at least appear to do so to the user.) If a 
control sequence is changed, the posting is to reflect it.  As long as I 
manually kill it, everything works fine, but I get:
	1) finger cramps
	2) quite uhhh...  'unhappy' at the stupidity requiring that...

There has to be some way of using a Message or Label (or some) widget as 
a simple posting board.

I have been using the python print statement (via what Windows calls a 
Command Window) quite nicely in Linux.  Under Linux only I would be 
content to go that route. Unfortunately the program also has to work in 
MicroSoft. And Microsoft has much to much of the old dinosaur age still 
in it.

Why the posting board?
	1) It posts for visual inspection the current controls chosen.
               A tally, a synopsis of the current choice pattern.
	2) It remains visible while the control panel vanishes to give
              the user the full screen to conduct the rest of the human
              interface with vendor's product. It reminds the user of
              what is to happen next.
	3) On re-display of main control screen the posting again
              functions as in 1) above. Thus serving as a reminder of
              "What I did last", because it does not change until a
              button is pressed, as well as "What I'm about to do."

This can't be the first time someone has needed this. But I have not 
found (probably just plain missed) it in all Tkinter references I have 
been able to find.

I have tried:
... (overhead)
a= StringVar()
p="string with formatting, variables and new lines"
a.set(p)
...  Label(root, textvar= '%s%s...' % p[:],
and a number of other things  and either it fails completely, looks 
horrible or generates lots of horrible messages telling me it don't like 
me because I'm not allowed to do that. :)

print '%s%s%...' % p[:]     works in any "Command Window", Linux or MS
The   ...Label(...  text= '%s%s%...' % p[:], ....
   works if I manually destroy the posting window to get each update.

I think I need a way to generate the W2 and exit leaving it visible.
Question is  HOW?  Or what is needed to effect the same?
Then the update can destroy old one and put up new one.


ANY  help is appreciated.

Using: Python 2.5.2, Linux Slackware 10.2
Today: 20090503
Snippets: non functional, for clarifying only

Steve


From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 19:19:34 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 23:19:34 GMT
Subject: Using Help inside Python
References: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>
	<00198f45$0$9761$c3e8da3@news.astraweb.com>
	<465fe83f-3269-4fa3-8d6a-75799254e1ba@z8g2000prd.googlegroups.com>
Message-ID: <001a00be$0$9761$c3e8da3@news.astraweb.com>

On Sun, 03 May 2009 13:21:49 -0700, rose wrote:

> Many Thanks to you Steven, for such a concise explanation of using the
> help. May I request some examples to make it a bit more explicit.

Suppose you want to get help about the max() function.

Inside IDLE, at the command prompt, type:

help(max) <ENTER>

where <ENTER> means "press the ENTER key".

If you want help about the min() function instead, type:

help(min) <ENTER>


If you have an object called "parrot", and you want to get help about 
that object, do this:

help(parrot) <ENTER>

If you just want general help about everything, type:

help() <ENTER>

and follow the instructions on screen.


-- 
Steven


From gdamjan at gmail.com  Sun May  3 19:49:25 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 04 May 2009 01:49:25 +0200
Subject: return functions
References: <f6a8cbe2-2078-4e0a-8b52-6437b440d18d@o30g2000vbc.googlegroups.com>
	<5dde50ab-c47d-471a-a8cb-3824387f42c5@x1g2000prh.googlegroups.com>
Message-ID: <55n1d6-4km.ln1@archaeopteryx.softver.org.mk>

> You seem to have finally discovered that when using Apache/mod_wsgi,
> Apache does a level of URL matching to filesystem based resources.

didn't Paste include something like that ...

> This isn't automatic in normal WSGI servers unless you use a WSGI
> middleware that does the mapping for you. :-)

finally found it  http://pythonpaste.org/modules/urlparser.html


-- 
?????? ( http://softver.org.mk/damjan/ )

  Begin...the rest is easy.



From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 19:52:29 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 23:52:29 GMT
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
Message-ID: <001a0876$0$9761$c3e8da3@news.astraweb.com>

On Sun, 03 May 2009 13:41:49 -0700, Zentrader wrote:

> There is no need for a function or a generator.  A for() loop is a
> unique case of a while loop
> ## for i in range(-10.5, 10.5, 0.1):
> ctr = -10.5
> while ctr < 10.5:
>    print ctr
>    ctr += 0.1


To match the semantics of range(), the final value to ctr must be less 
than but not equal to 10.5. 

>>> print ctr
10.6

Your solution does not do this -- it goes one steps too many, and then 
misleadingly fails to print the value. This is a bug waiting to hit, any 
time somebody runs your loop then goes to use ctr outside the loop.



-- 
Steven


From gdamjan at gmail.com  Sun May  3 19:58:19 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 04 May 2009 01:58:19 +0200
Subject: Doc strings in descriptors
References: <gtj70a$h7d$1@foggy.unx.sas.com>
Message-ID: <rln1d6-mkm.ln1@archaeopteryx.softver.org.mk>

> I have a simple descriptor to create a cached property as shown below.
...
> The problem is that when I use the help() function on them, I don't
> get the doc string from the function that is being wrapped. 
...
> What do I need to do to get the doc string of the wrapped function to
> apper when using help()?

take a look at
http://pypi.python.org/pypi/decorator
and possibly 
http://docs.python.org/library/functools.html#functools.update_wrapper


-- 
?????? ( http://softver.org.mk/damjan/ )

Real men don't use backups, they post their stuff on a public ftp server 
and let the rest of the world make copies.
   -- Linus Torvalds



From gagsl-py2 at yahoo.com.ar  Sun May  3 20:05:33 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 03 May 2009 21:05:33 -0300
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
Message-ID: <op.utdo7jajx6zn5v@gabriel.sleipnir-bsas>

En Sun, 03 May 2009 17:41:49 -0300, Zentrader <zentraders at gmail.com>  
escribi?:

> There is no need for a function or a generator.  A for() loop is a
> unique case of a while loop
> ## for i in range(-10.5, 10.5, 0.1):
> ctr = -10.5
> while ctr < 10.5:
>    print ctr
>    ctr += 0.1

Isn't so easy. You have representation errors and rounding errors here,  
and they accumulate. The last number printed should be 10.4 but I get 10.5:
...
10.3
10.4
10.5
(or more precisely, 10.499999999999959)

Also, after exiting a for loop, the *last* value used is retained. In your  
while loop, the ctr variable contains the *next* value.

-- 
Gabriel Genellina



From emile at fenx.com  Sun May  3 20:21:53 2009
From: emile at fenx.com (Emile van Sebille)
Date: Sun, 03 May 2009 17:21:53 -0700
Subject: Self function
In-Reply-To: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
Message-ID: <gtlcba$vj0$1@ger.gmane.org>

On 5/3/2009 3:39 PM bearophileHUGS at lycos.com said...
> Sometimes I rename recursive functions, or I duplicate&modify them,
> and they stop working because inside them there's one or more copy of
> their old name.
> This happens to me more than one time every year.
> So I have written this:
> 
> from inspect import getframeinfo, currentframe
> 
> def SOMEVERYUGLYNAME(n):
>     if n <= 1:
>         return 1
>     else:
>         self_name = getframeinfo(currentframe()).function
>         #self_name = getframeinfo(currentframe())[2] # older python
> 
>         # only if it's a global function
>         #return n * globals()[self_name](n - 1)
>         return n * eval(self_name + "(%d)" % (n - 1))
> assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6
> 
> Are there nicer ways to do that? 

I've sometimes used classes like:


class SOMEVERYUGLYNAME:
     def __call__(self,n):
         if n<=1:
             return 1
         else:
             return n*self.__class__()(n-1)

assert SOMEVERYUGLYNAME()(6) == 2*3*4*5*6


It's probably nicer (for some definition of nice), but I wouldn't say 
it's nice.

Emile



From gagsl-py2 at yahoo.com.ar  Sun May  3 20:22:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 03 May 2009 21:22:21 -0300
Subject: Doc strings in descriptors
References: <gtj70a$h7d$1@foggy.unx.sas.com>
	<rln1d6-mkm.ln1@archaeopteryx.softver.org.mk>
Message-ID: <op.utdpzji9x6zn5v@gabriel.sleipnir-bsas>

En Sun, 03 May 2009 20:58:19 -0300, ?????? ??????????? <gdamjan at gmail.com>  
escribi?:

>> I have a simple descriptor to create a cached property as shown below.
> ...
>> The problem is that when I use the help() function on them, I don't
>> get the doc string from the function that is being wrapped.
> ...
>> What do I need to do to get the doc string of the wrapped function to
>> apper when using help()?
>
> take a look at
> http://pypi.python.org/pypi/decorator
> and possibly
> http://docs.python.org/library/functools.html#functools.update_wrapper

That doesn't help. The descriptor *does* have its docstring copied from  
the function. But pydoc (the module behind the help system) doesn't handle  
the case - "normal" properties are handled specially, but a generic  
descriptor like that is not understood.

(and it's not so easy to fix - pydoc does a lot of things, all intermixed:  
it tries to discover all
methods and attributes, determine which are relevant, extract  
documentation from them, organize and clasify such documentation, generate  
HTML files/text files/present it to the user/run a webserver/invoke the  
pager... Too much for my taste, but I disgress...)

-- 
Gabriel Genellina



From doctoresam at gmail.com  Sun May  3 20:41:47 2009
From: doctoresam at gmail.com (Deep_Feelings)
Date: Sun, 3 May 2009 17:41:47 -0700 (PDT)
Subject: python docs for beginner programmer?
Message-ID: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>

Starting to learn python and because i don't want to read something
twice (i get bored quickly) i need a source to learn python that is as
comprehensive as possible.


Do you think python online docs are good starting point for me? ( i
experience with other programming languages ) or should i get giant
book or something ?

thankx



From ldo at geek-central.gen.new_zealand  Sun May  3 20:44:59 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 04 May 2009 12:44:59 +1200
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
Message-ID: <gtldqb$91p$1@lust.ihug.co.nz>

In message 
<deb7353b-19f7-48d7-9777-92b02eed7879 at r3g2000vbp.googlegroups.com>, 
Deep_Feelings wrote:

> Do you think python online docs are good starting point for me?

Why not try them and see?



From doctoresam at gmail.com  Sun May  3 20:49:03 2009
From: doctoresam at gmail.com (Deep_Feelings)
Date: Sun, 3 May 2009 17:49:03 -0700 (PDT)
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
	<gtldqb$91p$1@lust.ihug.co.nz>
Message-ID: <597f14c1-981c-4b94-a64b-a0a96f35f574@e14g2000vbe.googlegroups.com>

On May 4, 3:44?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message
> <deb7353b-19f7-48d7-9777-92b02eed7... at r3g2000vbp.googlegroups.com>,
>
> Deep_Feelings wrote:
> > Do you think python online docs are good starting point for me?
>
> Why not try them and see?

thank you

should i try them then after a month of reading i discover that they
are - for example - not suitable for beginners OR should i ask here
first ? :)


From matt at tplus1.com  Sun May  3 21:04:31 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Mon, 04 May 2009 01:04:31 GMT
Subject: How to walk up parent directories?
Message-ID: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>

Is there already a tool in the standard library to let me walk up from a
subdirectory to the top of my file system?

In other words, I'm looking for something like:

    >>> for x in walkup('/home/matt/projects'):
    ...     print(x)
    /home/matt/projects
    /home/matt
    /home
    /

I know I could build something like this with various os.path
components, but I'm hoping I don't have to.

TIA


Matt


From ben+python at benfinney.id.au  Sun May  3 21:05:14 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 04 May 2009 11:05:14 +1000
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
	<gtldqb$91p$1@lust.ihug.co.nz>
	<597f14c1-981c-4b94-a64b-a0a96f35f574@e14g2000vbe.googlegroups.com>
Message-ID: <87vdohk791.fsf@benfinney.id.au>

Deep_Feelings <doctoresam at gmail.com> writes:

> should i try them then after a month of reading i discover that they
> are - for example - not suitable for beginners OR should i ask here
> first ? :)

You should take on the task of educating yourself. The official Python
docs are an excellent resource. If you're self-admittedly someone who
gets bored quickly, though, that's not a problem anyone but you can
solve.

-- 
 \      ?It seems intuitively obvious to me, which means that it might |
  `\                                           be wrong.? ?Chris Torek |
_o__)                                                                  |
Ben Finney


From gokhansever at gmail.com  Sun May  3 21:21:27 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Sun, 3 May 2009 20:21:27 -0500
Subject: python docs for beginner programmer?
In-Reply-To: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
Message-ID: <49d6b3500905031821w557a8d08m3bcb65b5ae74068a@mail.gmail.com>

Hey,

I am a person who gets bored too quickly, too especially reading
technical materials, and if the author(s) have the habit of wondering
off the subject often. So far, I like Wesley Chun's Core Python book
the most as a Python beginner like you. He also has video training
material on the same subject. Easy to read, very well explanations and
good chosen examples...

That said, after getting a few months of familiarity, I want to get
into the roots of the Python. So where else could be the best choice
but the actual language user guide and reference manual :)

Enjoy your Python programming adventures...

G?khan



On Sun, May 3, 2009 at 7:41 PM, Deep_Feelings <doctoresam at gmail.com> wrote:
> Starting to learn python and because i don't want to read something
> twice (i get bored quickly) i need a source to learn python that is as
> comprehensive as possible.
>
>
> Do you think python online docs are good starting point for me? ( i
> experience with other programming languages ) or should i get giant
> book or something ?
>
> thankx
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From ben+python at benfinney.id.au  Sun May  3 21:24:59 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 04 May 2009 11:24:59 +1000
Subject: How to walk up parent directories?
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
Message-ID: <87ocu9k6c4.fsf@benfinney.id.au>

Matthew Wilson <matt at tplus1.com> writes:

> Is there already a tool in the standard library to let me walk up from
> a subdirectory to the top of my file system?

Sounds like a pretty seldom-needed task, with an implementation simple
using the existing standard library parts.

> In other words, I'm looking for something like:
> 
>     >>> for x in walkup('/home/matt/projects'):
>     ...     print(x)
>     /home/matt/projects
>     /home/matt
>     /home
>     /

    >>> import os.path
    >>> def walkup(path):
    ...     at_top = False
    ...     while not at_top:
    ...         yield path
    ...         parent_path = os.path.dirname(path)
    ...         if parent_path == path:
    ...             at_top = True
    ...         else:
    ...             path = parent_path
    ... 
    >>> for dir in walkup('/home/matt/projects'):
    ...     print dir
    ... 
    /home/matt/projects
    /home/matt
    /home
    /

> I know I could build something like this with various os.path
> components, but I'm hoping I don't have to.

Not every simple function belongs in the standard library :-)

-- 
 \        ?Ubi dubium, ibi libertas.? (?Where there is doubt, there is |
  `\                                                        freedom.?) |
_o__)                                                                  |
Ben Finney


From kirby.urner at gmail.com  Sun May  3 21:30:35 2009
From: kirby.urner at gmail.com (kirby.urner at gmail.com)
Date: Sun, 3 May 2009 18:30:35 -0700 (PDT)
Subject: pythonic chew toyz (continued)
Message-ID: <7f96ae2f-a51c-4760-a135-38d18945b42e@d38g2000prn.googlegroups.com>

On Sun, May 3, 2009 at 5:52 PM, kirby <kirby.urner at gmail.com> wrote:

> From: "kirby.ur... at gmail.com" <kirby.ur... at gmail.com>
> Date: Jan 14, 2:18 pm
> Subject: pythonic chew toyz (a column, by K. Urner) v.1 n.1
> To: comp.lang.python
>
>
> Selena spotted me right away as "the O'Reilly spy", me agreeing she
> had an exceptionally good memory, maybe we could recruit her?  Our
> banter traces to the first meeting on OS Bridge and how I introduced
> myself [0], not yet realizing Allison Randal was in the audience (way
> more an insider, as to how many Ls in Randall).[1]
>

Selena kindly welcomed us into her home for an OS Bridge meeting
awhile back, where we tackled the daunting task of sorting through a
great many interesting proposals, mine barely squeaking by (yes, helps
to have a self interested party at the table, I don't deny it).
Audrey was a strong advocate for Allison Randal's getting to speak,
but of course that's a shoe in.  I'm more the maverick, not having
invented any virtual machines yet, just a lot of verbiage mostly, with
source code sprinkled in (syntactic sugar we call it).

Selena is a Postgres jock many of you may already know.
http://www.chesnok.com/daily/  Take a look for news on the new Sun -
Oracle merger (yes we know, MySQL).  Audrey is with our Legion of Tech
especially in the Rails community (which Kaplan-Moss said some nice
things about).  Together these two are anchoring OS Bridge, our new
Open Source conference in Oregon, the Pacific Northwest always in the
mood for some big geeky festival, with lots of fun themes, like FOSS
on the Farm.  http://opensourcebridge.org/sessions/240

> Last night in the Roman room (CubeSpace) I proposed she could emcee
> the panel we're planning (maybe?), after the new Mayor (Sam Adams)
> kicks it off with a keynote -- all in the proposal stage, looking over
> her shoulder.
>

Sam got rather famous after I posted this or was it before I forget,
but a Wild West town like ours is supposed to go overboard into
various forms of burlesque, player piano optional, maybe a few head
turning cross-dressers (truly, PDX is proud of its heritage, think our
airport is pretty spiffy, plus Ikea, other destinations, take the Max,
Go By Train, very green).

> I was also there for the __metaclasses__ discussion by John Melesky,
> and for work, most of that same day (this is PDX CubeSpace, a lot of
> us rent office space).  Jason talked about the __missing__ rib (in
> dict).[2]
>
> As we were getting settled, they talked about OSCON, perking my
> interest.  Whereas some take the view we're somehow competing with San
> Jose (where some of my friends work, or worked in the case of Maxtor
> and IBM), my model is more Cirque du Soleil, given where "geeks" come
> from (something about chickens).[3]
>

I haven't decided about OSCON yet, would love to go, love the show,
but this retarded economy has me showing my bank every move, no
suitcases of cash like before (just kidding).

Seriously, that O'Reilly School of Technology guy was like "we're
gonna miss the free beer" referring to sometimes generous Alaska
airlines people, maybe Frontier I don't know, giving passengers an up
front taste for our offerings, this being not only a FOSS capital, per
CSM 2005, but a Beer Capital as well (funny how these go together hand
in glove -- no tap at Free Geek though, whereas at Cubespace it's like
50% foam).

Anyway, I've heard many wonderful things about San Jose and will say
this first hand:  the Silicon Valley is not our enemy, nor is the
Silicon Hills (Austin), so there, you have it in writing.

> Five OSCONs running in parallel in any given summer would make more
> sense than just one, but then O'Reilly isn't quite as big as McGraw-
> Hill (BYTE), yet.  Anyway, Portland is happy to share the glory.  OS
> Bridge is yet another bulb on the breadboard (aka grid), getting
> brighter by the day.
>
> Speaking of BYTE, I also learned last night that Eliza, our geek
> therapist, is alive and well in Python, as a part of the Natural
> Language Toolkit or NLTK.  And she's got company.  Some of you may
> recall Hugh Kenner's hilarious investigation of chat bots, then very
> new, in a way back issue (1980s).[4]
>

I tried to get Nat Bobbitt interested in this but he said "no more
comms" perhaps being strategic, time will tell.  I admit to not
following through either, making Sun Tzu and Eliza have conversational
intercourse, a great high school project, and now we have a Watcher
between Pycons -- Vern Ceder, tasked with scoping out talent,
Pythonistas too young for a Pycon maybe (Hyatts pretty racy, lots of
alcoholic beverages), but still able to exhibit in a poster session,
perhaps with a teacher as stand in, proud for the whole school (Python
Teacher of the Year?) -- we'll have someone for high schools to
contact (soon).  Check edu-sig archives for more data.

edu-sig @ Python.org web page was transitioned to our university
president in residence, Dr. Crunchy (yes, an alias), should have some
contact info by summer.  Ramping up slowly, as Pycon is traditionally
business oriented, into planning and doing things right (thx to CTE
this year, also on the job for DjangoConf per this guy's sources --
make a space for September).

> Hugh, by the way, was a leading 20th century James Joyce scholar and
> fan of R. Buckminster Fuller (see 'The Pound Era'), Bucky a champion
> for me as well (hence my rbf.py -- named after the guy, for use with
> VPython, POV-Ray, x3d etc., more on edu-sig).
>
> I'll catch up again later, maybe from Chicago, maybe before.[5]
>

So yeah, Chicago was great.  Too much for one Chew Toyz (the name of
this column), so I'll say some more later, haven't finished watching
all the Blip TVs yet.  Loved 'Designing Django' by Kaplan-Moss,
forwarded to __CHR__ as exemplary of professional (and fun).[0]  My
talk cost extra so don't expect to see the whole thing on Blip, co-
presented with Holden (holdenweb.com), with "Dr. Ian" contributing a
short video re Diffie-Hellman-Merkle (I mostly did RSA because that's
how we do it in Portland so far (wave to Lionel [1])).

Kirby

Cc:  http://osgarden.appspot.com/motd.html

[0]  http://pycon.blip.tv/file/1957605/
[1]  http://worldgame.blogspot.com/2009/03/spring-equinox-2009.html


> [0]http://mail.python.org/pipermail/portland/2008-November/000512.html
> [1]http://radar.oreilly.com/allison/
> [2]http://mybizmo.blogspot.com/2009/01/ppug-2009113.html
> [3]http://worldgame.blogspot.com/2007/06/pro-python-propaganda.html
> [4]http://mathforum.org/kb/message.jspa?messageID=5256703&tstart=0
> [5]http://showmedo.com/videos/video?name=1010050&fromSeriesID=101
>
> [ 2nd edition: reformatted, fixed endnotes ]
>
> << with thanks to verizon wireless >>



From ebonak at hotmail.com  Sun May  3 21:41:23 2009
From: ebonak at hotmail.com (Esmail)
Date: Sun, 03 May 2009 21:41:23 -0400
Subject: for with decimal values?
In-Reply-To: <op.utdo7jajx6zn5v@gabriel.sleipnir-bsas>
References: <mailman.4975.1241277173.11746.python-list@python.org>	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
	<op.utdo7jajx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <gtlh43$7eg$1@ger.gmane.org>

Gabriel Genellina wrote:
> 
> Isn't so easy. You have representation errors and rounding errors here, 
> and they accumulate. The last number printed should be 10.4 but I get 10.5:
> ...
> 10.3
> 10.4
> 10.5
> (or more precisely, 10.499999999999959)
> 
> Also, after exiting a for loop, the *last* value used is retained. In 
> your while loop, the ctr variable contains the *next* value.


All this discussion makes me wonder if it would be a good idea
for Python to have this feature (batteries included and all) - it
would have its uses, no?



From ben+python at benfinney.id.au  Sun May  3 21:58:12 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 04 May 2009 11:58:12 +1000
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
	<op.utdo7jajx6zn5v@gabriel.sleipnir-bsas>
	<mailman.5022.1241401297.11746.python-list@python.org>
Message-ID: <87fxflk4sr.fsf@benfinney.id.au>

Esmail <ebonak at hotmail.com> writes:

> All this discussion makes me wonder if it would be a good idea
> for Python to have this feature (batteries included and all) - it
> would have its uses, no?

What feature are you referring to? Python already has fixed-point
decimal values in the ?decimal.Decimal? type, if that's what you mean.

-- 
 \          ?I spent all my money on a FAX machine. Now I can only FAX |
  `\                                          collect.? ?Steven Wright |
_o__)                                                                  |
Ben Finney


From ross.jett at gmail.com  Sun May  3 22:36:35 2009
From: ross.jett at gmail.com (Ross)
Date: Sun, 3 May 2009 19:36:35 -0700 (PDT)
Subject: Code works fine except...
Message-ID: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>

For the past couple weeks, I've been working on an algorithm to
schedule tennis leagues given court constraints and league
considerations (i.e. whether it's a singles or a doubles league). Here
were my requirements when I was designing this algorithm:

-Each player plays against a unique opponent each week.
-Similarly, in a doubles league, each player plays with a unique
partner each week.
-Each player gets a fair number of bye weeks (i.e. the player with the
most bye weeks will have no more than one bye week than the player
with the least number of bye weeks)

I'm very close to arriving at my desired solution, but I have one
glaring flaw. When I have an even number of players sign up for my
league and there are court constraints, my current algorithm gives the
first player in my league a bye week every single week. I'll post my
code below and see how you guys think I should add to/ amend my code.

def round_robin(players, rounds):
    if len(players)%2:
	players.insert(0, None)
    mid = len(players)//2
    for i in range(rounds):
	yield zip(players[:mid], players[mid:])
	players = players[0:1] + players[mid:mid+1] + players[1:mid-1] +
players[mid+1:] + players[mid-1:mid]


def test_round_robin(players, rounds, courts, doubles = False):
    players = range(players)
    for week in round_robin(players,rounds,courts):
	    if doubles == True:
		    doubles_week = len(week)/2.0
		    byes = doubles_week - courts
		    if byes == 0:
			    bye_list = []
		    else:
			    bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
		    playing = [u for u in week if u not in bye_list]
		    midd = len(playing)//2
		    doub_sched = zip(playing[:midd], playing[midd:])
		    print doub_sched, bye_list
	    else:
		    byes = len(week)- courts
		    if byes == 0:
			    bye_list = []
		    else:
			    bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
		    playing = [u for u in week if u not in bye_list]
		    print playing, bye_list


From wuwei23 at gmail.com  Sun May  3 22:48:20 2009
From: wuwei23 at gmail.com (alex23)
Date: Sun, 3 May 2009 19:48:20 -0700 (PDT)
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org> 
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com> 
	<op.utdo7jajx6zn5v@gabriel.sleipnir-bsas>
	<mailman.5022.1241401297.11746.python-list@python.org>
Message-ID: <e9939643-a961-4a85-9436-2f9e6a1b0fbd@y33g2000prg.googlegroups.com>

On May 4, 11:41?am, Esmail <ebo... at hotmail.com> wrote:
> All this discussion makes me wonder if it would be a good idea
> for Python to have this feature (batteries included and all) - it
> would have its uses, no?

Well, sometimes more discussion == less consensus :)

But it's really easy to roll your own:

from decimal import Decimal

def args2dec(fn):
    '''*args to Decimal decorator'''
    float2dec = lambda f: Decimal(str(f))
    def _args2dec(*args):
        args = map(float2dec, args)
        return fn(*args)
    return _args2dec

@args2dec
def drange(start, stop, step):
    while start < stop:
        yield start
        start += step



From clp2 at rebertia.com  Sun May  3 23:29:22 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 3 May 2009 20:29:22 -0700
Subject: Code works fine except...
In-Reply-To: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
Message-ID: <50697b2c0905032029g7b0009a6ia191be312119b5d3@mail.gmail.com>

On Sun, May 3, 2009 at 7:36 PM, Ross <ross.jett at gmail.com> wrote:
> For the past couple weeks, I've been working on an algorithm to
> schedule tennis leagues given court constraints and league
> considerations (i.e. whether it's a singles or a doubles league). Here
> were my requirements when I was designing this algorithm:
>
> -Each player plays against a unique opponent each week.
> -Similarly, in a doubles league, each player plays with a unique
> partner each week.
> -Each player gets a fair number of bye weeks (i.e. the player with the
> most bye weeks will have no more than one bye week than the player
> with the least number of bye weeks)
>
> I'm very close to arriving at my desired solution, but I have one
> glaring flaw. When I have an even number of players sign up for my
> league and there are court constraints, my current algorithm gives the
> first player in my league a bye week every single week. I'll post my
> code below and see how you guys think I should add to/ amend my code.
>
> def round_robin(players, rounds):
> ? ?if len(players)%2:
> ? ? ? ?players.insert(0, None)
> ? ?mid = len(players)//2
> ? ?for i in range(rounds):
> ? ? ? ?yield zip(players[:mid], players[mid:])
> ? ? ? ?players = players[0:1] + players[mid:mid+1] + players[1:mid-1] +
> players[mid+1:] + players[mid-1:mid]
>
>
> def test_round_robin(players, rounds, courts, doubles = False):
> ? ?players = range(players)
> ? ?for week in round_robin(players,rounds,courts):
> ? ? ? ? ? ?if doubles == True:
> ? ? ? ? ? ? ? ? ? ?doubles_week = len(week)/2.0
> ? ? ? ? ? ? ? ? ? ?byes = doubles_week - courts
> ? ? ? ? ? ? ? ? ? ?if byes == 0:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ?bye_list = []
> ? ? ? ? ? ? ? ? ? ?else:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ?bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
> ? ? ? ? ? ? ? ? ? ?playing = [u for u in week if u not in bye_list]
> ? ? ? ? ? ? ? ? ? ?midd = len(playing)//2
> ? ? ? ? ? ? ? ? ? ?doub_sched = zip(playing[:midd], playing[midd:])
> ? ? ? ? ? ? ? ? ? ?print doub_sched, bye_list
> ? ? ? ? ? ?else:
> ? ? ? ? ? ? ? ? ? ?byes = len(week)- courts
> ? ? ? ? ? ? ? ? ? ?if byes == 0:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ?bye_list = []
> ? ? ? ? ? ? ? ? ? ?else:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ?bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
> ? ? ? ? ? ? ? ? ? ?playing = [u for u in week if u not in bye_list]
> ? ? ? ? ? ? ? ? ? ?print playing, bye_list

Probably not the cause of the problem, but where did the magic numbers
1.072 and 1.08 come from?

Cheers,
Chris
-- 
http://blog.rebertia.com


From sjmachin at lexicon.net  Sun May  3 23:29:46 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 3 May 2009 20:29:46 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
Message-ID: <a4aadd59-1d8a-40e0-b69d-d1d0ef9e01cf@x31g2000prc.googlegroups.com>

On May 4, 12:36?pm, Ross <ross.j... at gmail.com> wrote:
> For the past couple weeks, I've been working on an algorithm to
> schedule tennis leagues given court constraints and league
> considerations (i.e. whether it's a singles or a doubles league). Here
> were my requirements when I was designing this algorithm:
>
> -Each player plays against a unique opponent each week.
> -Similarly, in a doubles league, each player plays with a unique
> partner each week.
> -Each player gets a fair number of bye weeks (i.e. the player with the
> most bye weeks will have no more than one bye week than the player
> with the least number of bye weeks)
>
> I'm very close to arriving at my desired solution, but I have one
> glaring flaw. When I have an even number of players sign up for my
> league and there are court constraints, my current algorithm gives the
> first player in my league a bye week every single week. I'll post my
> code below and see how you guys think I should add to/ amend my code.
>
> def round_robin(players, rounds):
> ? ? if len(players)%2:
> ? ? ? ? players.insert(0, None)
> ? ? mid = len(players)//2
> ? ? for i in range(rounds):
> ? ? ? ? yield zip(players[:mid], players[mid:])
> ? ? ? ? players = players[0:1] + players[mid:mid+1] + players[1:mid-1] +
> players[mid+1:] + players[mid-1:mid]
>
> def test_round_robin(players, rounds, courts, doubles = False):
> ? ? players = range(players)

DON'T change the type/contents/meaning of a variable name like that.
E.g. use "nthings" for a number of things and "things" for a
collection of things.

> ? ? for week in round_robin(players,rounds,courts):

The round_robin() function has only TWO arguments. This code won't
even run.

When you document neither your data structures nor what your functions
are intended to do, the last hope for somebody trying to make sense of
your code is to give meaningful names to your variables. "week" and
"doubles_week" are NOT meaningful.

> ? ? ? ? ? ? if doubles == True:

Bletch. s/ == True//


> ? ? ? ? ? ? ? ? ? ? doubles_week = len(week)/2.0

I doubt very much that using floating point is a good idea here.

> ? ? ? ? ? ? ? ? ? ? byes = doubles_week - courts
> ? ? ? ? ? ? ? ? ? ? if byes == 0:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = []
> ? ? ? ? ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = week[::int(round(1.072*(courts/byes)+1.08))]

The derivation of the constants 1.072 and 1.08 is .... what?

> ? ? ? ? ? ? ? ? ? ? playing = [u for u in week if u not in bye_list]
> ? ? ? ? ? ? ? ? ? ? midd = len(playing)//2
> ? ? ? ? ? ? ? ? ? ? doub_sched = zip(playing[:midd], playing[midd:])
> ? ? ? ? ? ? ? ? ? ? print doub_sched, bye_list
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? byes = len(week)- courts
> ? ? ? ? ? ? ? ? ? ? if byes == 0:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = []
> ? ? ? ? ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
> ? ? ? ? ? ? ? ? ? ? playing = [u for u in week if u not in bye_list]
> ? ? ? ? ? ? ? ? ? ? print playing, bye_list



From gallium.arsenide at gmail.com  Sun May  3 23:32:02 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Sun, 3 May 2009 20:32:02 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
Message-ID: <a0420fb7-8395-48ed-98e8-4f3a01493116@r34g2000vba.googlegroups.com>

On May 3, 10:36?pm, Ross <ross.j... at gmail.com> wrote:

> def round_robin(players, rounds):
[snip]

>
> def test_round_robin(players, rounds, courts, doubles = False):
> ? ? players = range(players)
> ? ? for week in round_robin(players,rounds,courts):
[snip]

First things first:  I take it the call to round_robin is only
supposed to take two parameters?  Or do you have a version that takes
3?

John


From isgrey at gmail.com  Sun May  3 23:47:20 2009
From: isgrey at gmail.com (Ioannis Lalopoulos)
Date: Sun, 3 May 2009 20:47:20 -0700 (PDT)
Subject: Tkinter, Trouble with Message,Label widget
References: <mailman.5017.1241392410.11746.python-list@python.org>
Message-ID: <4f61c431-1c78-4de7-9b82-08eee09ae7d6@s20g2000vbp.googlegroups.com>

I assume that you create the two windows through two different calls
to Tkinter.Tk() but you cannot enter two mainloops (at least not in a
normal way).

If you want a second window use the Toplevel widget.

Try the following, it does what you want:

import Tkinter

root = Tkinter.Tk()

my_text = Tkinter.StringVar(root)

another_window = Tkinter.Toplevel()

entry = Tkinter.Entry(root, textvar=my_text)
entry.pack()

label = Tkinter.Label(another_window, textvar=my_text)
label.pack()

root.mainloop()

In the above example, whatever you type in the entry widget in the
root window gets reflected in the label widget which is inside the
second window, the one that was created with Tkinter.Toplevel().

Hope it helps,

John


From research at johnohagan.com  Mon May  4 00:26:15 2009
From: research at johnohagan.com (John O'Hagan)
Date: Mon, 4 May 2009 04:26:15 +0000
Subject: object query assigned variable name?
In-Reply-To: <200905020422.20895.research@johnohagan.com>
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
	<200905020422.20895.research@johnohagan.com>
Message-ID: <200905040426.15958.research@johnohagan.com>

On Sat, 2 May 2009, John O'Hagan wrote:
> On Fri, 1 May 2009, warpcat wrote:

[...]

> > Given an object:
> >
> > class Spam(object):
> >     def __init__(self):
> >         # stuff....
> >
> > I'd like it to print, when instanced, something like this:
> > >>> s = Spam()
> >
> > I?m assigned to s!
>
> If you just want the names an instance has in a given namespace, you could
> give your class a method like:
>
> class KnowNames(object):
>     def get_names(self, namespace):
>         id_str = str(hex(id(self))[:-1])
>         return [i for i in namespace if id_str in str(namespace[i])]
>
> which will give you a list of names when called on an instance.

And which is a silly way of saying:

class KnowName(object):
    def get_names(self, namespace):
        return [i for i in namespace if namespace[i] is self]

removing four function calls, an assignment and a slicing operation from a 
mere two lines; certainly a personal best for insanely over-wrought code!

Oops. :) ,

John


From kyrie at uh.cu  Mon May  4 00:38:42 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Mon, 04 May 2009 00:38:42 -0400
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <20090501052226.GA6860@cskk.homeip.net>
References: <20090501052226.GA6860@cskk.homeip.net>
Message-ID: <1241411922.49fe715207236@mail.uh.cu>


Quoting Cameron Simpson <cs at zip.com.au>:

> | And as it happens I have an IterableQueue class right here which does
> | _exact_ what was just described. You're welcome to it if you like.
> | Added bonus is that, as the name suggests, you can use the class as
> | an iterator:
> |   for item in iterq:
> |     ...
> | The producer calls iterq.close() when it's done.
> 
> Someone asked, so code appended below.
> [...]

Thank you!. I tested it, and it seems to work... and having the queue be an
iterable is a plus. Thank you, Cameron & MRAB!

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie

-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From kyrie at uh.cu  Mon May  4 00:56:26 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Mon, 04 May 2009 00:56:26 -0400
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <001201c9ca39$b9c4d140$0d00a8c0@Hendrik>
References: <200904301649.10341.kyrie@uh.cu>
	<001201c9ca39$b9c4d140$0d00a8c0@Hendrik>
Message-ID: <1241412986.49fe757a94f93@mail.uh.cu>


Quoting Hendrik van Rooyen <mail at microcorp.co.za>:

>  "Luis Zarrabeitia" <akakyrie at uh.cu> wrote:
> 
> 8< -------explanation and example of one producer, --------
> 8< -------more consumers and one queue --------------------
> 
> >As you can see, I'm sending one 'None' per consumer, and hoping that no 
> >consumer will read more than one None. While this particular implementation
> 
> 
> You don't have to hope. You can write the consumers that way to guarantee
> it.

I did. But that solution is not very reusable (I _must_ remember that
implementation detail every time) and most important, i'll have to remember it
in a few months with I'm updating the code.


> >ensures that, it is very fragile. Is there any way to signal the consumers?
>  
> Signalling is not easy - you can signal a process, but I doubt if it is 
> possible to signal a thread in a process.
> 
> >(or better yet, the queue itself, as it is shared by all consumers?) 
> >Should "close" work for this? (raise the exception when the queue is 
> >exhausted, not when it is closed by the producer).
> 
> I haven't the foggiest if this will work, and it seems to me to be kind
> of involved compared to passing a sentinel or sentinels.

Well, that would be a vaild signal. Too bad I have to pass it by hand, instead
of the queue class taking care of it for me.

> I have always wondered why people do the one queue many getters thing.
> 
> Given that the stuff you pass is homogenous in that it will require a
> similar amount of effort to process, is there not a case to be made
> to have as many queues as consumers, and to round robin the work?

Abstraction. This problem is modeled nicely as a producer-consumer (it would be
in fact a classic producer-consumer). I could take care of the scheduling
myself, but there are already good scheduling algorithms written for my OS, that
take into account both the available CPU and IO.

A solution may not be a queue (in my case, I don't care the order in which the
elements are processed, only that they are), but ideally I would just be
'yielding' results on my producer(s), and receiving them on my consumer(s),
leaving the IPC mechanism to deal with how to move the data from producers to
consumers (and to which consumers).

> And if the stuff you pass around needs disparate effort to consume,
> it seems to me that you can more easily balance the load by having
> specialised consumers, instead of instances of one humungous 
> "I can eat anything" consumer.

Not necessarily. The load may depend on the size of the data that was sent. The
consumers are receiving the same kind of data, only the sizes are different
(non-predictable different). Again, I could try to implement some heuristics to
try and guess what processor has lower load, but I'd rather delegate that to the OS.

> I also think that having a queue per consumer thread makes it easier
> to replace the threads with processes and the queues with pipes or
> sockets if you need to do serious scaling later.

This is already multiprocess. It could be nice to extend it to multi-computers
later, but the complexity is not worth it right now.

> In fact I happen to believe that anything that does any work needs 
> one and only one input queue and nothing else, but I am peculiar
> that way.

Well, I also need some output. In my case, the outputs are files with the result
of the processing, that can be summarized later (hence the need to 'join' the
processes, to know when I can summarize them).

Thank you.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie

-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From kyrie at uh.cu  Mon May  4 01:02:36 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Mon, 04 May 2009 01:02:36 -0400
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <aY2dnRrlQaxfLGHUnZ2dnUVZ_h6dnZ2d@earthlink.com>
References: <mailman.4864.1241124562.11746.python-list@python.org>
	<aY2dnRrlQaxfLGHUnZ2dnUVZ_h6dnZ2d@earthlink.com>
Message-ID: <1241413356.49fe76ec17c83@mail.uh.cu>


Quoting Dennis Lee Bieber <wlfraed at ix.netcom.com>:

> 	I'm not familiar with the multiprocessing module and its queues but,
> presuming it behaves similar to the threading module AND that you have
> design control over the consumers (as you did in the sample) make a
> minor change.
> 
> 	queue.put(None)	ONCE in the producer
> 
> 	Then, in the consumer, after it sees the None and begins shutdown
> processing, have the consumer ALSO do
> 
> 	queue.put(None)
> 

Thank you. I went with this idea, only that instead of modifying the consumer, I
modified the queue itself... Well, Cameron Simpson did :D. It's working nicely now.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie

-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From gallium.arsenide at gmail.com  Mon May  4 01:16:20 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Sun, 3 May 2009 22:16:20 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
Message-ID: <7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>

On May 3, 11:29 pm, Chris Rebert <c... at rebertia.com> wrote:

> Probably not the cause of the problem, but where
> did the magic numbers 1.072 and 1.08 come from?

It is perhaps not the most direct cause of the problem, in the sense
that the magic numbers could take various values and the problem would
still be there.  But the magic numbers appear to be used for
"spreading out" bye selection, and that's broken.

The extended slice as written will always pick the first element,
since the step is guaranteed to be positive.  Since the first player
(or None, when there are an odd number of players) stays put in the
first position during the round_robin shuffle, that player will always
be selected for a bye.

Further, as written, the calculated number of byes has no bearing on
the actual number of byes selected.

I think what I would do is adjust the shuffling algorithm in such a
way that everyone moves through the various positions in the list
(would it be as simple as adding a shift at the end of
round_robin???).  Then I could simply select the byes from one end of
the list (with a regular slice instead of an extended slice).

John


From rylesny at gmail.com  Mon May  4 01:21:31 2009
From: rylesny at gmail.com (rylesny at gmail.com)
Date: Sun, 3 May 2009 22:21:31 -0700 (PDT)
Subject: Multiprocessing.Queue - I want to end.
References: <mailman.4864.1241124562.11746.python-list@python.org> 
	<2759676b-952a-46d0-a766-334782794984@o18g2000yqi.googlegroups.com>
Message-ID: <eb743022-027b-4c42-bc1c-ae716714bb2c@u10g2000vbd.googlegroups.com>

> You may have to write the consumer loop by hand, rather than using
> 'for'. ?In the same-process case, you can do this.
>
> producer:
> sentinel= object( )
>
> consumer:
> while True:
> ? item= queue.get( )
> ? if item is sentinel:
> ? ? break
> ? etc.
>
> Then, each consumer is guaranteed to consume no more than one
> sentinel, and thus producing one sentinel per consumer will halt them
> all.
>
> However, with multiple processes, the comparison to 'sentinel' will
> fail, since each subprocess gets a copy, not the original, of the
> sentinel.

Rather than use object() you can create a type whose instances are
equal.

class Stopper(object):
    def __eq__(self, other):
        return type(other) == type(self)

producer's stop():
  queue.put(Stopper())

consumers main loop:
  for item in iter(queue.get, Stopper()):
      ...


From icebergwtf at gmail.com  Mon May  4 01:21:59 2009
From: icebergwtf at gmail.com (tiefeng wu)
Date: Mon, 4 May 2009 13:21:59 +0800
Subject: smtplib send email by using gmail smtp server
In-Reply-To: <op.utc8o5g6x6zn5v@gabriel.sleipnir-bsas>
References: <4314c1f70905030818y73809e16s45e04f8edb5ce714@mail.gmail.com>
	<op.utc8o5g6x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <4314c1f70905032221j61ed1e3bka6222edf1d1ab1@mail.gmail.com>

>
> I've tested with 3.0.1 on Windows XP and worked fine. Seems to be a problem
> in the SSL support, but that's all I could say.
>
> --
> Gabriel Genellina
>

thanks, I'll check SSL support on my system

Tiefeng Wu
2009-05-04
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From ur.liam at iksmlapan.reverse  Mon May  4 01:28:28 2009
From: ur.liam at iksmlapan.reverse (Napalmski)
Date: Mon, 4 May 2009 06:28:28 +0100
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
	<gtldqb$91p$1@lust.ihug.co.nz>
	<597f14c1-981c-4b94-a64b-a0a96f35f574@e14g2000vbe.googlegroups.com>
	<87vdohk791.fsf@benfinney.id.au>
Message-ID: <MPG.24688d4eea1aa666989682@eu.news.astraweb.com>

In article <87vdohk791.fsf at benfinney.id.au>, ben+python at benfinney.id.au 
says...
> 
> Deep_Feelings <doctoresam at gmail.com> writes:
> 
> > should i try them then after a month of reading i discover that they
> > are - for example - not suitable for beginners OR should i ask here
> > first ? :)
> 
> You should take on the task of educating yourself. The official Python
> docs are an excellent resource. If you're self-admittedly someone who
> gets bored quickly, though, that's not a problem anyone but you can
> solve.

Been doing Python for a week or so now and I must agree that the 
official python docs are a fantastic resource.
I'm not sure how good they would be for someone with no previous 
programming language experience but they seem to be pretty thourough, at 
least for one beginning the language.
http://docs.python.org/tutorial/index.html


From alex at bluebottle.net.au  Mon May  4 01:46:06 2009
From: alex at bluebottle.net.au (Alex Jurkiewicz)
Date: Mon, 04 May 2009 13:46:06 +0800
Subject: Threaded alternatives to smtplib?
Message-ID: <49FE811E.8060400@bluebottle.net.au>

Hi all,
I'm writing a Python script to do a "mail merge" style email 
distribution. I create a few python threads and in each one I call 
`smtpserver = smtplib.SMTP(our.smtpserver.com)`. However, during the 
sending process, there seems to be only one connection open to our mail 
server at any one time. In other words, all these threads gain me no 
speed benefit at all!

I seem to be running into the issue where smtplib is not fully 
thread-safe, as mentioned in this thread:
http://mail.python.org/pipermail/python-list/2007-March/429067.html
http://mail.python.org/pipermail/python-list/2007-March/429172.html

Does anyone have suggestions as to a suitable workaround for this issue? 
I was looking at the Twisted library, which seems possible but 
significantly more complex.


Thanks,
Alex Jurkiewicz


From showell30 at yahoo.com  Mon May  4 02:21:10 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 3 May 2009 23:21:10 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<mailman.5019.1241396412.11746.python-list@python.org>
Message-ID: <8629a726-aca4-43c4-a223-ae150944fd58@o27g2000vbd.googlegroups.com>

On May 3, 5:21?pm, Emile van Sebille <em... at fenx.com> wrote:
> On 5/3/2009 3:39 PM bearophileH... at lycos.com said...
>
>
>
> > Sometimes I rename recursive functions, or I duplicate&modify them,
> > and they stop working because inside them there's one or more copy of
> > their old name.
> > This happens to me more than one time every year.
> > So I have written this:
>
> > from inspect import getframeinfo, currentframe
>
> > def SOMEVERYUGLYNAME(n):
> > ? ? if n <= 1:
> > ? ? ? ? return 1
> > ? ? else:
> > ? ? ? ? self_name = getframeinfo(currentframe()).function
> > ? ? ? ? #self_name = getframeinfo(currentframe())[2] # older python
>
> > ? ? ? ? # only if it's a global function
> > ? ? ? ? #return n * globals()[self_name](n - 1)
> > ? ? ? ? return n * eval(self_name + "(%d)" % (n - 1))
> > assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6
>
> > Are there nicer ways to do that?
>
> I've sometimes used classes like:
>
> class SOMEVERYUGLYNAME:
> ? ? ?def __call__(self,n):
> ? ? ? ? ?if n<=1:
> ? ? ? ? ? ? ?return 1
> ? ? ? ? ?else:
> ? ? ? ? ? ? ?return n*self.__class__()(n-1)
>
> assert SOMEVERYUGLYNAME()(6) == 2*3*4*5*6
>
> It's probably nicer (for some definition of nice), but I wouldn't say
> it's nice.
>

Some of that could probably abstracted into a decorator maybe?


From clp2 at rebertia.com  Mon May  4 02:24:40 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 3 May 2009 23:24:40 -0700
Subject: Strange interaction between timeit and recursion
In-Reply-To: <gtm17v$18vn$2@adenine.netfront.net>
References: <00198774$0$9761$c3e8da3@news.astraweb.com>
	<gtm17v$18vn$2@adenine.netfront.net>
Message-ID: <50697b2c0905032324m27fcaa1k90d0407ef4c74adb@mail.gmail.com>

On Sun, May 3, 2009 at 11:27 PM, namekuseijin
<namekuseijin.nospam at gmail.com> wrote:
> Recursion is unpythonic. ?Do not use it.

That's a tad extreme. I think the accepted practice is merely not to
use recursion gratuitously.

Cheers,
Chris
-- 
http://blog.rebertia.com


From namekuseijin.nospam at gmail.com  Mon May  4 02:26:18 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Mon, 04 May 2009 03:26:18 -0300
Subject: Using Help inside Python
In-Reply-To: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>
References: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>
Message-ID: <gtm158$18vn$1@adenine.netfront.net>

I'm from the time when I inspected python objects themselves, say:

print obj.__doc__
or
dir( obj )

to know the goodies...


From namekuseijin.nospam at gmail.com  Mon May  4 02:27:46 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Mon, 04 May 2009 03:27:46 -0300
Subject: Strange interaction between timeit and recursion
In-Reply-To: <00198774$0$9761$c3e8da3@news.astraweb.com>
References: <00198774$0$9761$c3e8da3@news.astraweb.com>
Message-ID: <gtm17v$18vn$2@adenine.netfront.net>

Recursion is unpythonic.  Do not use it.


From arnodel at googlemail.com  Mon May  4 02:29:29 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 04 May 2009 07:29:29 +0100
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
Message-ID: <m2iqkhnzxy.fsf@googlemail.com>

bearophileHUGS at lycos.com writes:

> Sometimes I rename recursive functions, or I duplicate&modify them,
> and they stop working because inside them there's one or more copy of
> their old name.
> This happens to me more than one time every year.
> So I have written this:
>
> from inspect import getframeinfo, currentframe
>
> def SOMEVERYUGLYNAME(n):
>     if n <= 1:
>         return 1
>     else:
>         self_name = getframeinfo(currentframe()).function
>         #self_name = getframeinfo(currentframe())[2] # older python
>
>         # only if it's a global function
>         #return n * globals()[self_name](n - 1)
>         return n * eval(self_name + "(%d)" % (n - 1))
> assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6
>
> Are there nicer ways to do that? I don't know.
> If there aren't, then a way may be added.
> An idea-syntax:
>
> def fact(n):
>     return 1 if n <= 1 else n * inspect.self(n - 1)
>
> Or even a lambda, because you don't need the name anymore to call the
> function:
>
> fact = lambda n: 1 if n <= 1 else n * self(n - 1)
>
> (If you have two or more recursive functions that call each other this
> idea can't be used, but I think such situations are uncommon enough to
> not deserve help from the language).
>
> Bye,
> bearophile

Here's an idea:

>>> def bindfunc(f):
...     def boundf(*args, **kwargs):
...         return f(boundf, *args, **kwargs)
...     return boundf
... 
>>> @bindfunc
... def fac(self, n):
...     return 1 if n <= 1 else n * self(n - 1)
... 
>>> fac(5)
120
>>> fac = bindfunc(lambda f, n: 1 if n <= 1 else n*f(n - 1))
>>> fac(5)
120

-- 
Arnaud





From clp2 at rebertia.com  Mon May  4 02:31:46 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 3 May 2009 23:31:46 -0700
Subject: Self function
In-Reply-To: <m2iqkhnzxy.fsf@googlemail.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
Message-ID: <50697b2c0905032331s27af9e63t2fcc0a365d24e4ab@mail.gmail.com>

On Sun, May 3, 2009 at 11:29 PM, Arnaud Delobelle
<arnodel at googlemail.com> wrote:
> bearophileHUGS at lycos.com writes:
>
>> Sometimes I rename recursive functions, or I duplicate&modify them,
>> and they stop working because inside them there's one or more copy of
>> their old name.
>> This happens to me more than one time every year.
>> So I have written this:
>>
>> from inspect import getframeinfo, currentframe
>>
>> def SOMEVERYUGLYNAME(n):
>> ? ? if n <= 1:
>> ? ? ? ? return 1
>> ? ? else:
>> ? ? ? ? self_name = getframeinfo(currentframe()).function
>> ? ? ? ? #self_name = getframeinfo(currentframe())[2] # older python
>>
>> ? ? ? ? # only if it's a global function
>> ? ? ? ? #return n * globals()[self_name](n - 1)
>> ? ? ? ? return n * eval(self_name + "(%d)" % (n - 1))
>> assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6
>>
>> Are there nicer ways to do that? I don't know.
>> If there aren't, then a way may be added.
>> An idea-syntax:
>>
>> def fact(n):
>> ? ? return 1 if n <= 1 else n * inspect.self(n - 1)
>>
>> Or even a lambda, because you don't need the name anymore to call the
>> function:
>>
>> fact = lambda n: 1 if n <= 1 else n * self(n - 1)
>>
>> (If you have two or more recursive functions that call each other this
>> idea can't be used, but I think such situations are uncommon enough to
>> not deserve help from the language).
>>
>> Bye,
>> bearophile
>
> Here's an idea:
>
>>>> def bindfunc(f):
> ... ? ? def boundf(*args, **kwargs):
> ... ? ? ? ? return f(boundf, *args, **kwargs)
> ... ? ? return boundf
> ...
>>>> @bindfunc
> ... def fac(self, n):
> ... ? ? return 1 if n <= 1 else n * self(n - 1)
> ...
>>>> fac(5)
> 120
>>>> fac = bindfunc(lambda f, n: 1 if n <= 1 else n*f(n - 1))
>>>> fac(5)
> 120

Why am I reminded of the Y-Combinator...?

Cheers,
Chris
-- 
http://blog.rebertia.com


From namekuseijin.nospam at gmail.com  Mon May  4 02:33:25 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Mon, 04 May 2009 03:33:25 -0300
Subject: yet another list comprehension question
In-Reply-To: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
Message-ID: <gtm1ik$19tj$1@adenine.netfront.net>

 >>> ls = [(1,2), (3,4), (5, None), (6,7), (8, None)]
 >>> [(x,y) for (x,y) in ls if y]
[(1, 2), (3, 4), (6, 7)]



From deets at nospam.web.de  Mon May  4 02:45:17 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 04 May 2009 08:45:17 +0200
Subject: Threaded alternatives to smtplib?
In-Reply-To: <mailman.5028.1241416479.11746.python-list@python.org>
References: <mailman.5028.1241416479.11746.python-list@python.org>
Message-ID: <767h7tF1b8q8gU1@mid.uni-berlin.de>

Alex Jurkiewicz schrieb:
> Hi all,
> I'm writing a Python script to do a "mail merge" style email 
> distribution. I create a few python threads and in each one I call 
> `smtpserver = smtplib.SMTP(our.smtpserver.com)`. However, during the 
> sending process, there seems to be only one connection open to our mail 
> server at any one time. In other words, all these threads gain me no 
> speed benefit at all!
> 
> I seem to be running into the issue where smtplib is not fully 
> thread-safe, as mentioned in this thread:
> http://mail.python.org/pipermail/python-list/2007-March/429067.html
> http://mail.python.org/pipermail/python-list/2007-March/429172.html
> 
> Does anyone have suggestions as to a suitable workaround for this issue? 
> I was looking at the Twisted library, which seems possible but 
> significantly more complex.

I doubt that there is such issue. The above discussion is not concluding 
that there actually *are* threading-issues within smtplib. And looking 
at the source of smtplib, it certainly doesn't use any 
locking-primitives or (directly) any c-extension that might explain such 
behavior.

Without more code, it's impossible to tell if there is anything peculiar 
in your usage of the lib. Maybe you close your connections to fast to 
see several open?

Diez


From deets at nospam.web.de  Mon May  4 02:46:39 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 04 May 2009 08:46:39 +0200
Subject: Strange interaction between timeit and recursion
In-Reply-To: <gtm17v$18vn$2@adenine.netfront.net>
References: <00198774$0$9761$c3e8da3@news.astraweb.com>
	<gtm17v$18vn$2@adenine.netfront.net>
Message-ID: <767hafF1b8q8gU2@mid.uni-berlin.de>

namekuseijin schrieb:
> Recursion is unpythonic.  Do not use it.

Since when? Says who?

Lacking tail-recursion, it's not the choice for loops, but whatever 
algorithm is recursive can be written as such.

Diez


From gagsl-py2 at yahoo.com.ar  Mon May  4 03:05:35 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 04 May 2009 04:05:35 -0300
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
Message-ID: <op.utd8nleux6zn5v@gabriel.sleipnir-bsas>

En Sun, 03 May 2009 21:41:47 -0300, Deep_Feelings <doctoresam at gmail.com>  
escribi?:

> Do you think python online docs are good starting point for me? ( i
> experience with other programming languages ) or should i get giant
> book or something ?

If you have some previous experience with other languages, I think that  
"Dive into Python" would be a good resource.

-- 
Gabriel Genellina



From jussij at zeusedit.com  Mon May  4 03:05:51 2009
From: jussij at zeusedit.com (JussiJ)
Date: Mon, 4 May 2009 00:05:51 -0700 (PDT)
Subject: What IDE support python 3.0.1 ?
References: <e154b479-82a6-4aca-9e7b-687ecabe68c8@e21g2000yqb.googlegroups.com>
	<mailman.3962.1239835547.11746.python-list@python.org>
	<48f7aa16-ea53-4373-817d-a95fdba6e355@3g2000yqk.googlegroups.com>
	<op.usgchrf7a8ncjz@gnudebst>
	<mailman.3975.1239852366.11746.python-list@python.org>
Message-ID: <4199fa56-4228-45bb-b400-6535bdbaaa64@y34g2000prb.googlegroups.com>

On Apr 16, 1:26 pm, Brendon Wickham <brendon.wick... at gmail.com> wrote:

> I agree, no IDE needed. Just don't use Notepad! I'm on Mac, so
> spoiled for choice of text editors, but I'm sure there's one
> or 2 good uns if you're on Windows.

The Zeus for Windows IDE is Python aware:

   http://www.zeusedit.com/python.html

It does syntax highlighting, smart indenting etc. You can even
write Zeus scripts in Python.

Jussi Jumppanen
Author: Zeus for Windows IDE


From alex at bluebottle.net.au  Mon May  4 03:19:21 2009
From: alex at bluebottle.net.au (Alex Jurkiewicz)
Date: Mon, 04 May 2009 15:19:21 +0800
Subject: Threaded alternatives to smtplib?
In-Reply-To: <767h7tF1b8q8gU1@mid.uni-berlin.de>
References: <mailman.5028.1241416479.11746.python-list@python.org>
	<767h7tF1b8q8gU1@mid.uni-berlin.de>
Message-ID: <49FE96F9.3000108@bluebottle.net.au>

Diez B. Roggisch wrote:
> Without more code, it's impossible to tell if there is anything 
> peculiar in your usage of the lib. Maybe you close your connections to 
> fast to see several open?

Here's the relevant stuff from my (python2.6) code:


CONCURRENCY = 3

def threadProcessRecipient():
    # Each thread has its own SMTP connection
    smtpserver = smtplib.SMTP(SMTPSERVER)
   
    # Each thread pulls a recipient entry from the queue to process and 
loops until the queue is empty.
    try:
        recipientData = recipientQueue.get_nowait()
    except Queue.Empty:
        recipientData = None
   
    while recipientData:
        message = prepareMessage()
        sendMail(senderEmail, recipientEmail, message, smtpserver)
       
        recipientQueue.task_done()
        try:
            recipientData = recipientQueue.get_nowait()
        except Queue.Empty:
            recipientData = None
   
    smtpserver.quit()

if __name__ == '__main__':
    THREADS = []
    for i in range(CONCURRENCY):
        THREADS.append(threading.Thread(target=threadProcessRecipient))
    for thread in THREADS:
        thread.run()
    for thread in THREADS:
        thread.join()


From mail at microcorp.co.za  Mon May  4 03:25:16 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 4 May 2009 09:25:16 +0200
Subject: Tkinter, Trouble with Message,Label widget
References: <49FE251C.40103@hughes.net>
Message-ID: <006d01c9cc89$7e3295c0$0d00a8c0@Hendrik>


 "norseman" <n..n at hughes.net> wrote:

> There has to be some way of using a Message or Label (or some) widget as
> a simple posting board.

There is - look at textvariable - an instance of StringVar that is associated
with
the widget.

If all else fails, you can always use configure to change the text...

hth - Hendrik



From gagsl-py2 at yahoo.com.ar  Mon May  4 03:40:34 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 04 May 2009 04:40:34 -0300
Subject: Threaded alternatives to smtplib?
References: <mailman.5028.1241416479.11746.python-list@python.org>
	<767h7tF1b8q8gU1@mid.uni-berlin.de>
	<49FE96F9.3000108@bluebottle.net.au>
Message-ID: <op.utd99wa6x6zn5v@gabriel.sleipnir-bsas>

En Mon, 04 May 2009 04:19:21 -0300, Alex Jurkiewicz  
<alex at bluebottle.net.au> escribi?:
> Diez B. Roggisch wrote:
>> Without more code, it's impossible to tell if there is anything  
>> peculiar in your usage of the lib. Maybe you close your connections to  
>> fast to see several open?
>
> Here's the relevant stuff from my (python2.6) code:
>
>
> CONCURRENCY = 3
>
> def threadProcessRecipient():
>     # Each thread has its own SMTP connection
>     smtpserver = smtplib.SMTP(SMTPSERVER)
>        # Each thread pulls a recipient entry from the queue to process  
> and loops until the queue is empty.
>     try:
>         recipientData = recipientQueue.get_nowait()
>     except Queue.Empty:
>         recipientData = None
>        while recipientData:
>         message = prepareMessage()
>         sendMail(senderEmail, recipientEmail, message, smtpserver)
>                recipientQueue.task_done()
>         try:
>             recipientData = recipientQueue.get_nowait()
>         except Queue.Empty:
>             recipientData = None
>        smtpserver.quit()

Try logging the start/stop of your threads. It may be that your threads  
stop before you think. The above code works correctly only if you fill the  
queue before starting any thread - because as soon as a thread sees the  
queue empty, it finishes.
You could use the sample code in the Queue documentation at the end of  
http://docs.python.org/library/queue.html

-- 
Gabriel Genellina



From hniksic at xemacs.org  Mon May  4 03:53:50 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Mon, 04 May 2009 09:53:50 +0200
Subject: Strange interaction between timeit and recursion
References: <00198774$0$9761$c3e8da3@news.astraweb.com>
Message-ID: <87ws8xe229.fsf@busola.homelinux.net>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

> I don't understand why my recursive function hits the recursion
> limit inside the timeit.Timer when it works outside of it.

Probably because your test function is at the very edge of the
recursion limit, and timeit.Timer triggers it because it calls it at a
deeper stack level than is the case with the interactive prompt.
AFAIK the "recursion limit" simply limits the number of nested
function calls.

> Is there any way to see the current recursion depth at a particular
> moment?

I don't think that's possible from within Python, although maybe it
should be.  The current recursion depth is a simple member of the
thread state structure that could be exposed as a low-level function
that begins with an underscore, similar to sys._getframe.  The
"inspect" module and various debuggers might put it to good use.


From mail at microcorp.co.za  Mon May  4 04:01:23 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 4 May 2009 10:01:23 +0200
Subject: Multiprocessing.Queue - I want to end.
References: <200904301649.10341.kyrie@uh.cu><001201c9ca39$b9c4d140$0d00a8c0@Hendrik>
	<1241412986.49fe757a94f93@mail.uh.cu>
Message-ID: <00a201c9cc8e$89420f40$0d00a8c0@Hendrik>

"Luis Alberto Zarrabeitia Gomez" <kyrie at uh.cu> wrote:

>Quoting Hendrik van Rooyen <mail at microcorp.co.za>:

>> In fact I happen to believe that anything that does any work needs
>> one and only one input queue and nothing else, but I am peculiar
>> that way.
>
>Well, I also need some output. In my case, the outputs are files with the
result
>of the processing, that can be summarized later (hence the need to 'join' the
>processes, to know when I can summarize them).

When you know what you want to do with the output (which
I suspect is your case) then the trick is to put the individual
outputs onto the input queue of the summary process.

This will form a virtual (or real if you have different machines)
systolic array with producers feeding consumers that feed
the summary process, all running concurrently.

Ponder on it that in the description only the word "feed" is used...

And if you don't know where your output must go, then it must be
put onto the input queue of your default router, who must know
what to do with stuff. - this is in a sense what happens when
you pipe stdout to stdin in a *nix environment - you use the OS
to set up a temporary systolic array.

You only need to keep the output of the consumers in files if
you need access to it later for some reason. In your case it sounds
as if you are only interested in the output of the summary.

- Hendrik




From alex at bluebottle.net.au  Mon May  4 04:31:46 2009
From: alex at bluebottle.net.au (Alex Jurkiewicz)
Date: Mon, 04 May 2009 16:31:46 +0800
Subject: Threaded alternatives to smtplib?
In-Reply-To: <op.utd99wa6x6zn5v@gabriel.sleipnir-bsas>
References: <mailman.5028.1241416479.11746.python-list@python.org>	<767h7tF1b8q8gU1@mid.uni-berlin.de>	<49FE96F9.3000108@bluebottle.net.au>
	<op.utd99wa6x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <49FEA7F2.9040605@bluebottle.net.au>

Gabriel Genellina wrote:
> Try logging the start/stop of your threads. It may be that your 
> threads stop before you think. The above code works correctly only if 
> you fill the queue before starting any thread - because as soon as a 
> thread sees the queue empty, it finishes.
> You could use the sample code in the Queue documentation at the end of 
> http://docs.python.org/library/queue.htm
The queue is actually filled before the threads are started, data is 
only removed after they start.

Logging thread state (at least in debug mode) would be good though. How 
would I go about it in this example? The docs suggest using thread.name, 
but in my current setup I don't have any idea which thread is running. 
Something like this:
for i in range(CONCURRENCY):
    THREADS.append( threading.Thread(target=threadProcessRecipient, 
args=i, name=i) )

And:

def threadProcessRecipient(name):
    print "Name is %s" % name


AJ


From deets at nospam.web.de  Mon May  4 05:14:38 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 04 May 2009 11:14:38 +0200
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
	<bea7d12e-2bda-4ec6-868b-440b79bd28e4@21g2000vbk.googlegroups.com>
	<mailman.5014.1241386734.11746.python-list@python.org>
	<4b87a84a-eef0-42cb-91f7-6ade662bdd4d@t10g2000vbg.googlegroups.com>
Message-ID: <767pt4F1ai5lsU1@mid.uni-berlin.de>

CTO wrote:

>> In addition, the zip file format stores the directory at the end of the
>> file. So you can't process it until it's completely downloaded.
>> Concurrency doesn't help here.
> 
> Don't think that's relevant, if I'm understanding the OP correctly.
> Lets say you've downloaded the file once and you're doing whatever
> the app does with it. Now, while that's happening the half an hour
> time limit comes up. Now you want to start another download, but
> you also want to continue to work with the old version. Voila,
> concurrency.

Which brings us backs to the "20 questions"-part of my earlier post. It
could be, but it could also be that processing takes seconds. Or it takes
so long that even concurrency won't help. Who knows?

Diez


From bearophileHUGS at lycos.com  Mon May  4 05:39:40 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 02:39:40 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
Message-ID: <e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>

Arnaud Delobelle:
> >>> def bindfunc(f):
> ... ? ? def boundf(*args, **kwargs):
> ... ? ? ? ? return f(boundf, *args, **kwargs)
> ... ? ? return boundf

> ...>>> @bindfunc
> ... def fac(self, n):
> ... ? ? return 1 if n <= 1 else n * self(n - 1)
> ...>>> fac(5)
> 120

This is cute, now I have two names to take care of.
Thank you to all the people that have answered.
Another possible syntax:

def fact(n):
    return 1 if n <= 1 else n * return(n - 1)

But I guess most people don't see this problem as important&common
enough to justify changing the language.

Bye,
bearophile


From deets at nospam.web.de  Mon May  4 06:52:05 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 04 May 2009 12:52:05 +0200
Subject: Threaded alternatives to smtplib?
References: <mailman.5028.1241416479.11746.python-list@python.org>	<767h7tF1b8q8gU1@mid.uni-berlin.de>	<49FE96F9.3000108@bluebottle.net.au>
	<op.utd99wa6x6zn5v@gabriel.sleipnir-bsas>
	<mailman.5038.1241425914.11746.python-list@python.org>
Message-ID: <767vjrF1bier8U1@mid.uni-berlin.de>

Alex Jurkiewicz wrote:

> Gabriel Genellina wrote:
>> Try logging the start/stop of your threads. It may be that your
>> threads stop before you think. The above code works correctly only if
>> you fill the queue before starting any thread - because as soon as a
>> thread sees the queue empty, it finishes.
>> You could use the sample code in the Queue documentation at the end of
>> http://docs.python.org/library/queue.htm
> The queue is actually filled before the threads are started, data is
> only removed after they start.
> 
> Logging thread state (at least in debug mode) would be good though. How
> would I go about it in this example? The docs suggest using thread.name,
> but in my current setup I don't have any idea which thread is running.
> Something like this:
> for i in range(CONCURRENCY):
>     THREADS.append( threading.Thread(target=threadProcessRecipient,
> args=i, name=i) )
> 
> And:
> 
> def threadProcessRecipient(name):
>     print "Name is %s" % name

Each thread gets an unique name assigned anyway. Alternatively, you can use
partial to bind parameters to functions. And last but not least to subclass
Thread is also an option.

Diez


From deets at nospam.web.de  Mon May  4 06:55:34 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 04 May 2009 12:55:34 +0200
Subject: Threaded alternatives to smtplib?
References: <mailman.5028.1241416479.11746.python-list@python.org>	<767h7tF1b8q8gU1@mid.uni-berlin.de>	<49FE96F9.3000108@bluebottle.net.au>
	<op.utd99wa6x6zn5v@gabriel.sleipnir-bsas>
	<mailman.5038.1241425914.11746.python-list@python.org>
	<767vjrF1bier8U1@mid.uni-berlin.de>
Message-ID: <767vqcF1bd5b4U1@mid.uni-berlin.de>

Diez B. Roggisch wrote:

> Alex Jurkiewicz wrote:
> 
>> Gabriel Genellina wrote:
>>> Try logging the start/stop of your threads. It may be that your
>>> threads stop before you think. The above code works correctly only if
>>> you fill the queue before starting any thread - because as soon as a
>>> thread sees the queue empty, it finishes.
>>> You could use the sample code in the Queue documentation at the end of
>>> http://docs.python.org/library/queue.htm
>> The queue is actually filled before the threads are started, data is
>> only removed after they start.
>> 
>> Logging thread state (at least in debug mode) would be good though. How
>> would I go about it in this example? The docs suggest using thread.name,
>> but in my current setup I don't have any idea which thread is running.
>> Something like this:
>> for i in range(CONCURRENCY):
>>     THREADS.append( threading.Thread(target=threadProcessRecipient,
>> args=i, name=i) )
>> 
>> And:
>> 
>> def threadProcessRecipient(name):
>>     print "Name is %s" % name
> 

Oh, and I forgot - threading.currentThread() gets you the actively running
thread of course.

Dize


From a.a.ovtchinnikov at gmail.com  Mon May  4 07:32:38 2009
From: a.a.ovtchinnikov at gmail.com (Snorri H)
Date: Mon, 4 May 2009 04:32:38 -0700 (PDT)
Subject: yet another list comprehension question
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
Message-ID: <dde406ca-ef32-4270-a4e3-db6aa5e4be5a@e20g2000vbc.googlegroups.com>

On May 3, 6:13 am, Ross <ross.j... at gmail.com> wrote:
> I'm trying to set up a simple filter using a list comprehension. If I
> have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
> and I wanted to filter out all tuples containing None, I would like to
> get the new list b = [(1,2), (3,4),(6,7)].
>
> I tried b = [i for i in a if t for t in i is not None]   but I get the
> error that "t is not defined". What am I doing wrong?


Works as well:
filter(lambda x:not None in x, your_list)


From arnodel at googlemail.com  Mon May  4 07:54:15 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 04 May 2009 12:54:15 +0100
Subject: yet another list comprehension question
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
	<dde406ca-ef32-4270-a4e3-db6aa5e4be5a@e20g2000vbc.googlegroups.com>
Message-ID: <m2skjlt76g.fsf@googlemail.com>

Snorri H <a.a.ovtchinnikov at gmail.com> writes:

> On May 3, 6:13 am, Ross <ross.j... at gmail.com> wrote:
>> I'm trying to set up a simple filter using a list comprehension. If I
>> have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
>> and I wanted to filter out all tuples containing None, I would like to
>> get the new list b = [(1,2), (3,4),(6,7)].
>>
>> I tried b = [i for i in a if t for t in i is not None]   but I get the
>> error that "t is not defined". What am I doing wrong?
>
>
> Works as well:
> filter(lambda x:not None in x, your_list)
                  ^^^^^^^^^^^^^
This is usually spelt 'None not in x'.

-- 
Arnaud



From mgalle at irisa.fr  Mon May  4 08:08:51 2009
From: mgalle at irisa.fr (=?ISO-8859-1?Q?Matthias_Gall=E9?=)
Date: Mon, 04 May 2009 14:08:51 +0200
Subject: find sublist inside list
Message-ID: <gtmlsk$q51$1@amma.irisa.fr>

Hi.

My problem is to replace all occurrences of a sublist with a new element.

Example:
Given ['a','c','a','c','c','g','a','c'] I want to replace all 
occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).

If I do this with string ('acaccgac') I have the advantage of all the 
'find' functions, but perfomance is bad and some extra care must be 
taken if one element consist of more then one character (case of 11 for 
example)

So I really would like to work with lists straightforward, but I could 
not found anything to search a sublist inside a list.
Any propositions for a simple solution?

Thanks in advance,


--
Matthias Gall?
Project Symbiose
Centre de Recherche INRIA Rennes - Bretagne Atlantique,
Campus de Beaulieu, 35042 Rennes cedex, France
tel: (33|0) 2 9984 7523
http://www.irisa.fr/symbiose/matthias_galle


From drobinow at gmail.com  Mon May  4 08:15:47 2009
From: drobinow at gmail.com (David Robinow)
Date: Mon, 4 May 2009 08:15:47 -0400
Subject: yet another list comprehension question
In-Reply-To: <gtm1ik$19tj$1@adenine.netfront.net>
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
	<gtm1ik$19tj$1@adenine.netfront.net>
Message-ID: <4eb0089f0905040515s7937dd6ck404282a8a52a105d@mail.gmail.com>

On Mon, May 4, 2009 at 2:33 AM, namekuseijin
<namekuseijin.nospam at gmail.com> wrote:
>>>> ls = [(1,2), (3,4), (5, None), (6,7), (8, None)]
>>>> [(x,y) for (x,y) in ls if y]
> [(1, 2), (3, 4), (6, 7)]

Nope. That filters out 0 as well as None. Not what the OP asked for.


From a.a.ovtchinnikov at gmail.com  Mon May  4 08:26:23 2009
From: a.a.ovtchinnikov at gmail.com (Snorri H)
Date: Mon, 4 May 2009 05:26:23 -0700 (PDT)
Subject: How to walk up parent directories?
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
Message-ID: <5deab389-38f2-4c54-bfe3-3ce7cefa8764@v17g2000vbb.googlegroups.com>

On May 4, 5:04 am, Matthew Wilson <m... at tplus1.com> wrote:
> Is there already a tool in the standard library to let me walk up from a
> subdirectory to the top of my file system?


Never seen such a standard tool, yet it can be implemented in a way
like this

def walkup(path):
    aux = path.rsplit('/')
    while aux != ['']:
        yield reduce(lambda x,y:x+'/'+y,aux)
        aux.pop()
    yield '/'

Maybe this is not the best way to ascend directories, but it seems to
work.


From mark at mailinator.com  Mon May  4 08:29:54 2009
From: mark at mailinator.com (Mark)
Date: 04 May 2009 12:29:54 GMT
Subject: What IDE support python 3.0.1 ?
References: <e154b479-82a6-4aca-9e7b-687ecabe68c8@e21g2000yqb.googlegroups.com>
	<mailman.3962.1239835547.11746.python-list@python.org>
Message-ID: <pan.2009.05.04.12.29.53@mailinator.com>

On Wed, 15 Apr 2009 22:45:35 +0000, Benjamin Peterson wrote:
> Why do you think you're wasting time with 2.x?

I'm a relative newbie to python as well but I'd agree that there is at
least a small degree of time "wasted" learning python 2.x simply because
the standard library of python 3.x has been cleaned up and consolidated
which makes learning it slightly easier.


From zasaconsulting at gmail.com  Mon May  4 08:38:10 2009
From: zasaconsulting at gmail.com (Alexzive)
Date: Mon, 4 May 2009 05:38:10 -0700 (PDT)
Subject: replacing numbers in LARGE MATRIX with criterium in 2 columns (a--> 
	b)
Message-ID: <68d22002-fc0a-4590-9395-c78b6ee412b2@r34g2000vba.googlegroups.com>

Hello,
I have this matrix [20*4 - but it could be n*4 , with n~100,000] in
file "EL_list" like this:

    1,      1,      2,      3
     2,      4,      1,      5
     3,      5,      1,      6
     4,      7,      5,      6
     5,      8,      7,      9
     6,      8,      5,      7
     7,     10,      9,      7
     8,     10,     11,     12
     9,      7,     13,     10
    10,     14,     15,     16
    11,     14,     17,     15
    12,     17,     14,     18
    13,     13,     16,     10
    14,     16,     15,     11
    15,     16,     11,     10
    16,     19,     20,     21
    17,     22,     15,     20
    18,     17,     20,     15
    19,     23,     20,     24
    20,     25,     24,     20

I would like to replace some numbers in "EL_list" but only in columns
2,3,4 using the criterium by line in file "criterium" (column 1 are
the new numbers, column 2 the old ones).

1	1
2	3
3	5
4	12
5	13
6	14
7	15
8	16
9	17
10	18
11	19
12	10
13	21
14	22
15	23
16	24
17	25

For example all the 7 have to replaced by 15 and so on..

-- How to implement it in a fast end efficient code?

many thanks, Alex


From bjourne at gmail.com  Mon May  4 08:39:08 2009
From: bjourne at gmail.com (=?ISO-8859-1?Q?BJ=F6rn_Lindqvist?=)
Date: Mon, 4 May 2009 14:39:08 +0200
Subject: Self function
In-Reply-To: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
Message-ID: <740c3aec0905040539y78d1332k71a911a7007aa49b@mail.gmail.com>

2009/5/4  <bearophileHUGS at lycos.com>:
> An idea-syntax:
>
> def fact(n):
> ? ?return 1 if n <= 1 else n * inspect.self(n - 1)
>
> Or even a lambda, because you don't need the name anymore to call the
> function:
>
> fact = lambda n: 1 if n <= 1 else n * self(n - 1)

How would it work with methods?

class Foo:
    def fac(self, n):
        return 1 if n <= 1 else n * self.self(n-1)

??


-- 
mvh Bj?rn


From zasaconsulting at gmail.com  Mon May  4 08:41:04 2009
From: zasaconsulting at gmail.com (Alessandro)
Date: Mon, 4 May 2009 05:41:04 -0700 (PDT)
Subject: replacing numbers in LARGE MATRIX with criterium in 2 columns 
	(a--> b)
References: <68d22002-fc0a-4590-9395-c78b6ee412b2@r34g2000vba.googlegroups.com>
Message-ID: <16a90ce7-7634-4f22-9f53-47b1e30ab234@r34g2000vba.googlegroups.com>

On May 4, 2:38 pm, Alexzive <zasaconsult... at gmail.com> wrote:
> Hello,
> I have this matrix [20*4 - but it could be n*4 , with n~100,000] in
> file "EL_list" like this:
>
>     1,      1,      2,      3
>      2,      4,      1,      5
>      3,      5,      1,      6
>      4,      7,      5,      6
>      5,      8,      7,      9
>      6,      8,      5,      7
>      7,     10,      9,      7
>      8,     10,     11,     12
>      9,      7,     13,     10
>     10,     14,     15,     16
>     11,     14,     17,     15
>     12,     17,     14,     18
>     13,     13,     16,     10
>     14,     16,     15,     11
>     15,     16,     11,     10
>     16,     19,     20,     21
>     17,     22,     15,     20
>     18,     17,     20,     15
>     19,     23,     20,     24
>     20,     25,     24,     20
>
> I would like to replace some numbers in "EL_list" but only in columns
> 2,3,4 using the criterium by line in file "criterium" (column 1 are
> the new numbers, column 2 the old ones).
>
> 1       1
> 2       3
> 3       5
> 4       12
> 5       13
> 6       14
> 7       15
> 8       16
> 9       17
> 10      18
> 11      19
> 12      10
> 13      21
> 14      22
> 15      23
> 16      24
> 17      25



>
> For example all the 7 have to replaced by 15 and so on..
>

ERRATA: for example, all the 15 have to replaced by 7 and so on..


From bearophileHUGS at lycos.com  Mon May  4 08:46:32 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 05:46:32 -0700 (PDT)
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
Message-ID: <25535ba8-80d9-4eb0-8f31-e453f31e0f26@s20g2000vbp.googlegroups.com>

Matthias Gall?:
> My problem is to replace all occurrences of a sublist with a new element.
> Example:
> Given ['a','c','a','c','c','g','a','c'] I want to replace all
> occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).

There are several ways to solve this problem. Representing a string as
a list of "chars" (1-strings) is fine if you work with small strings,
but once they get longer you need too much memory and time.

This is a starting point:

>>> mapper = {"a":6, "c":6}
>>> data = 'acaccgac'
>>> [mapper.get(c, c) for c in data]
[6, 6, 6, 6, 6, 'g', 6, 6]

If you need higher performance, to represent few small numbers into a
well defined string like genomic data, you can use ASCII values of 6
and 11:

>>> from string import maketrans
>>> tab = maketrans("acgt", "".join([chr(6), chr(6), "gt"]))
>>> s.translate(tab)
'\x06\x06\x06\x06\x06g\x06\x06'

Later in processing it's easy to tell apart normal genome bases from
those small numbers.

Note that there is the array.array function too in the standard lib,
and elsewhere there is Numpy too.

There are several other possible solutions, but I stop here so you can
explain your purposes and constraints better.

Bye,
bearophile


From mail at johnohagan.com  Mon May  4 09:01:36 2009
From: mail at johnohagan.com (John O'Hagan)
Date: Mon, 4 May 2009 13:01:36 +0000
Subject: find sublist inside list
In-Reply-To: <gtmlsk$q51$1@amma.irisa.fr>
References: <gtmlsk$q51$1@amma.irisa.fr>
Message-ID: <200905041301.36962.mail@johnohagan.com>

On Mon, 4 May 2009, Matthias Gall? wrote:
> Hi.
>
> My problem is to replace all occurrences of a sublist with a new element.
>
> Example:
> Given ['a','c','a','c','c','g','a','c'] I want to replace all
> occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).
>

li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c'] 
for i  in range(len(li)):
    if li[i:i + 2] == ['a', 'c']:
        li[i:i + 2] = ['6']

HTH,

John






From f.guerrieri at gmail.com  Mon May  4 09:13:27 2009
From: f.guerrieri at gmail.com (Francesco Guerrieri)
Date: Mon, 4 May 2009 15:13:27 +0200
Subject: find sublist inside list
In-Reply-To: <200905041301.36962.mail@johnohagan.com>
References: <gtmlsk$q51$1@amma.irisa.fr>
	<200905041301.36962.mail@johnohagan.com>
Message-ID: <79b79e730905040613y5ba8e36wb27e66260f06247@mail.gmail.com>

On Mon, May 4, 2009 at 3:01 PM, John O'Hagan <mail at johnohagan.com> wrote:

> On Mon, 4 May 2009, Matthias Gall? wrote:
> > Hi.
> >
> > My problem is to replace all occurrences of a sublist with a new element.
> >
> > Example:
> > Given ['a','c','a','c','c','g','a','c'] I want to replace all
> > occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).
> >
>
> li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
> for i  in range(len(li)):
>    if li[i:i + 2] == ['a', 'c']:
>        li[i:i + 2] = ['6']
>
> HTH,
>
> John
>

Beware that you are mutating the list you are iterating over. That could
lead to some strange bugs (for instance if you replaced the deleted items
with a longer sequence, the range(len(li)) would still go up to the original
lenght).
It is better to modify a new list instead. Eg you could append to a new
list.

Francesco
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From bearophileHUGS at lycos.com  Mon May  4 09:20:34 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 06:20:34 -0700 (PDT)
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
	<mailman.5041.1241442097.11746.python-list@python.org>
Message-ID: <c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com>

John O'Hagan:
> li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
> for i ?in range(len(li)):
> ? ? if li[i:i + 2] == ['a', 'c']:
> ? ? ? ? li[i:i + 2] = ['6']

Oh well, I have done a mistake, it seems.
Another solution then:

>>> 'acaccgac'.replace("ac", chr(6))
'\x06\x06cg\x06'

Bye,
bearophile


From amrbekhit at gmail.com  Mon May  4 09:27:49 2009
From: amrbekhit at gmail.com (Amr)
Date: Mon, 4 May 2009 06:27:49 -0700 (PDT)
Subject: Default padding for Tkinter grid
Message-ID: <e534085e-8f6a-46e9-82d8-316eccfbf8f1@u10g2000vbd.googlegroups.com>

Hello all,

I've been spending the last few days experimenting with Tkinter. The
grid manager is nice and easy to use, but I have found that I am often
having to specify padx and pady options to every widget I add to my
grid. The way I am doing it is to create a dictionary:

paddding = {'padx': '1m', 'pady': '1m'}

and then apply it to the grid method using **padding.

However, I was wondering if there was a way of setting default padx
and pady controls for the grid, so that I can just call grid without
having to specify any extra parameters.

Thanks,

--Amr


From tomanishkb at gmail.com  Mon May  4 09:30:28 2009
From: tomanishkb at gmail.com (M Kumar)
Date: Mon, 4 May 2009 19:00:28 +0530
Subject: Help in getting the IP address of client machines
Message-ID: <783b47270905040630y2342bb61xe741ba84bbb86707@mail.gmail.com>

Hi,

I am using pylons web framework for my server. I need to get the ip address
of the client machine which made a request to the server in my python code.
How can I do that, I am new to pylons and the existing server has so many
applications. looking forward to get some solutions from the kind friendly
users

thanks & regards
Maneesh KB
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From ganesh.gbg at gmail.com  Mon May  4 09:44:41 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Mon, 4 May 2009 06:44:41 -0700 (PDT)
Subject: Is there is any way to send messages to  chunk of emails ID's  
	concurrently using smptlib
Message-ID: <17ea2ba6-3f5d-4e7e-b05b-6d91dfbc5b36@k19g2000prh.googlegroups.com>

Hi friends,
I suppose sendmail() can send mails one by one ,how to send mails
concurrently ,
It would be very grateful,if someone could point out a solution.
Thanks
Ganesh


From deets at nospam.web.de  Mon May  4 09:45:16 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 04 May 2009 15:45:16 +0200
Subject: How to walk up parent directories?
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
	<5deab389-38f2-4c54-bfe3-3ce7cefa8764@v17g2000vbb.googlegroups.com>
Message-ID: <7689oiF1bjavlU1@mid.uni-berlin.de>

Snorri H wrote:

> On May 4, 5:04 am, Matthew Wilson <m... at tplus1.com> wrote:
>> Is there already a tool in the standard library to let me walk up from a
>> subdirectory to the top of my file system?
> 
> 
> Never seen such a standard tool, yet it can be implemented in a way
> like this
> 
> def walkup(path):
>     aux = path.rsplit('/')
>     while aux != ['']:
>         yield reduce(lambda x,y:x+'/'+y,aux)
>         aux.pop()
>     yield '/'
> 
> Maybe this is not the best way to ascend directories, but it seems to
> work.

It's not working for windows. And using reduce to create a path instead of 

os.sep.join(aux)

seems to be showing off mad functional coding skillz than anything else...

Diez


From kyrie at uh.cu  Mon May  4 09:52:14 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Mon, 4 May 2009 09:52:14 -0400
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <00a201c9cc8e$89420f40$0d00a8c0@Hendrik>
References: <200904301649.10341.kyrie@uh.cu>
	<1241412986.49fe757a94f93@mail.uh.cu>
	<00a201c9cc8e$89420f40$0d00a8c0@Hendrik>
Message-ID: <200905040952.14804.kyrie@uh.cu>

On Monday 04 May 2009 04:01:23 am Hendrik van Rooyen wrote:

> This will form a virtual (or real if you have different machines)
> systolic array with producers feeding consumers that feed
> the summary process, all running concurrently.

Nah, I can't do that. The summary process is expensive, but not nearly as 
expensive as the consuming (10 minutes vs. a few hours), and can't be started 
anyway before the consumers are done.

> You only need to keep the output of the consumers in files if
> you need access to it later for some reason. In your case it sounds
> as if you are only interested in the output of the summary.

Or if the summarizing process requires that it is stored on files. Or if the 
consumers naturally store the data on files. The consumers "produce" several 
gigabytes of data, not enough to make it intractable, but enough to not want 
to load them into RAM or transmit it back.

In case you are wondering what the job is: i'm indexing a lot of documents 
with Xapian. The producer reads the [compressed] documents from the hard 
disk, the consumers process it and index it on they own xapian database. When 
they are finished, I merge the databases (the summarizing) and delete the 
partial DBs. I don't need the DBs to be in memory at any time, and xapian 
works with files anyway. Even if I were to use different machines (not worth 
it for a process that will not run very frequently, except at developing 
time), it would be still cheaper to scp the files.

Now, if I only had a third core available to consume a bit faster ...

Regards,

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From davea at ieee.org  Mon May  4 09:52:38 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 04 May 2009 09:52:38 -0400
Subject: replacing numbers in LARGE MATRIX with criterium in 2 columns
	(a--> b)
In-Reply-To: <16a90ce7-7634-4f22-9f53-47b1e30ab234@r34g2000vba.googlegroups.com>
References: <68d22002-fc0a-4590-9395-c78b6ee412b2@r34g2000vba.googlegroups.com>
	<16a90ce7-7634-4f22-9f53-47b1e30ab234@r34g2000vba.googlegroups.com>
Message-ID: <49FEF326.7080501@ieee.org>



Alessandro wrote:
> On May 4, 2:38 pm, Alexzive <zasaconsult... at gmail.com> wrote:
>   
>> Hello,
>> I have this matrix [20*4 - but it could be n*4 , with n~100,000] in
>> file "EL_list" like this:
>>
>>     1,      1,      2,      3
>>      2,      4,      1,      5
>>      3,      5,      1,      6
>>      4,      7,      5,      6
>>      5,      8,      7,      9
>>      6,      8,      5,      7
>>      7,     10,      9,      7
>>      8,     10,     11,     12
>>      9,      7,     13,     10
>>     10,     14,     15,     16
>>     11,     14,     17,     15
>>     12,     17,     14,     18
>>     13,     13,     16,     10
>>     14,     16,     15,     11
>>     15,     16,     11,     10
>>     16,     19,     20,     21
>>     17,     22,     15,     20
>>     18,     17,     20,     15
>>     19,     23,     20,     24
>>     20,     25,     24,     20
>>
>> I would like to replace some numbers in "EL_list" but only in columns
>> 2,3,4 using the criterium by line in file "criterium" (column 1 are
>> the new numbers, column 2 the old ones).
>>
>> 1       1
>> 2       3
>> 3       5
>> 4       12
>> 5       13
>> 6       14
>> 7       15
>> 8       16
>> 9       17
>> 10      18
>> 11      19
>> 12      10
>> 13      21
>> 14      22
>> 15      23
>> 16      24
>> 17      25
>>     
>
>
>
>   
>> For example all the 7 have to replaced by 15 and so on..
>>
>>     
>
> ERRATA: for example, all the 15 have to replaced by 7 and so on..
>
>   
What have you come up with so far?  Did the instructor give you any 
sample code to solve similar problems?  Did he really describe it as a 
matrix?

Sounds to me like you have two text files.  One contains a replacement 
table (which you can read into a dictionary), and the other (large) file 
is just text.  After building the dictionary, you'd want a loop that 
goes through the text file, splitting each line into a list of four.  
You then use the dictionary to replace list items 1, 2, and 3, and write 
the result someplace.

Try writing the code, see if anything goes wrong, and then ask for help.



From google at mrabarnett.plus.com  Mon May  4 09:54:33 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 14:54:33 +0100
Subject: replacing numbers in LARGE MATRIX with criterium in 2 columns
	(a--> 	b)
In-Reply-To: <68d22002-fc0a-4590-9395-c78b6ee412b2@r34g2000vba.googlegroups.com>
References: <68d22002-fc0a-4590-9395-c78b6ee412b2@r34g2000vba.googlegroups.com>
Message-ID: <49FEF399.5070806@mrabarnett.plus.com>

Alexzive wrote:
> Hello,
> I have this matrix [20*4 - but it could be n*4 , with n~100,000] in
> file "EL_list" like this:
> 
>     1,      1,      2,      3
>      2,      4,      1,      5
>      3,      5,      1,      6
>      4,      7,      5,      6
>      5,      8,      7,      9
>      6,      8,      5,      7
>      7,     10,      9,      7
>      8,     10,     11,     12
>      9,      7,     13,     10
>     10,     14,     15,     16
>     11,     14,     17,     15
>     12,     17,     14,     18
>     13,     13,     16,     10
>     14,     16,     15,     11
>     15,     16,     11,     10
>     16,     19,     20,     21
>     17,     22,     15,     20
>     18,     17,     20,     15
>     19,     23,     20,     24
>     20,     25,     24,     20
> 
> I would like to replace some numbers in "EL_list" but only in columns
> 2,3,4 using the criterium by line in file "criterium" (column 1 are
> the new numbers, column 2 the old ones).
> 
> 1	1
> 2	3
> 3	5
> 4	12
> 5	13
> 6	14
> 7	15
> 8	16
> 9	17
> 10	18
> 11	19
> 12	10
> 13	21
> 14	22
> 15	23
> 16	24
> 17	25
> 
> For example all the 7 have to replaced by 15 and so on..
> 
> -- How to implement it in a fast end efficient code?
 >
Read the contents of "criterium" into a dict with the old value as the
key and the new value as the value and then iterate through the matrix
replacing the values in columns 2 to 4 with criterium.get(current_value,
current_value).

Incidentally, the singular of "criteria" is "criterion" because it's
Greek, not Latin.


From google at mrabarnett.plus.com  Mon May  4 09:57:51 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 14:57:51 +0100
Subject: [SPAM] Re: Threaded alternatives to smtplib?
In-Reply-To: <767h7tF1b8q8gU1@mid.uni-berlin.de>
References: <mailman.5028.1241416479.11746.python-list@python.org>
	<767h7tF1b8q8gU1@mid.uni-berlin.de>
Message-ID: <49FEF45F.7070700@mrabarnett.plus.com>

Diez B. Roggisch wrote:
> Alex Jurkiewicz schrieb:
>> Hi all,
>> I'm writing a Python script to do a "mail merge" style email 
>> distribution. I create a few python threads and in each one I call 
>> `smtpserver = smtplib.SMTP(our.smtpserver.com)`. However, during the 
>> sending process, there seems to be only one connection open to our 
>> mail server at any one time. In other words, all these threads gain me 
>> no speed benefit at all!
>>
>> I seem to be running into the issue where smtplib is not fully 
>> thread-safe, as mentioned in this thread:
>> http://mail.python.org/pipermail/python-list/2007-March/429067.html
>> http://mail.python.org/pipermail/python-list/2007-March/429172.html
>>
>> Does anyone have suggestions as to a suitable workaround for this 
>> issue? I was looking at the Twisted library, which seems possible but 
>> significantly more complex.
> 
> I doubt that there is such issue. The above discussion is not concluding 
> that there actually *are* threading-issues within smtplib. And looking 
> at the source of smtplib, it certainly doesn't use any 
> locking-primitives or (directly) any c-extension that might explain such 
> behavior.
> 
> Without more code, it's impossible to tell if there is anything peculiar 
> in your usage of the lib. Maybe you close your connections to fast to 
> see several open?
> 
If all the threads are using the same server, couldn't the SMTP part be
put into its own thread and then fed the pre-composed emails via a
queue?


From dns4 at cornell.edu  Mon May  4 09:58:40 2009
From: dns4 at cornell.edu (David Smith)
Date: Mon, 04 May 2009 09:58:40 -0400
Subject: How to walk up parent directories?
In-Reply-To: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
Message-ID: <gtmsag$ha2$1@ruby.cit.cornell.edu>

Matthew Wilson wrote:
> Is there already a tool in the standard library to let me walk up from a
> subdirectory to the top of my file system?
> 
> In other words, I'm looking for something like:
> 
>     >>> for x in walkup('/home/matt/projects'):
>     ...     print(x)
>     /home/matt/projects
>     /home/matt
>     /home
>     /
> 
> I know I could build something like this with various os.path
> components, but I'm hoping I don't have to.
> 
> TIA
> 
> 
> Matt

You should take a look at the os.path module.  Seems like you might find
something in that toolbox for this.

--David


From mgalle at irisa.fr  Mon May  4 10:01:02 2009
From: mgalle at irisa.fr (=?ISO-8859-1?Q?Matthias_Gall=E9?=)
Date: Mon, 04 May 2009 16:01:02 +0200
Subject: find sublist inside list
In-Reply-To: <c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com>
References: <gtmlsk$q51$1@amma.irisa.fr>
	<mailman.5041.1241442097.11746.python-list@python.org>
	<c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com>
Message-ID: <gtmsf0$se7$1@amma.irisa.fr>

bearophileHUGS at lycos.com wrote:
> John O'Hagan:
>> li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
>> for i  in range(len(li)):
>>     if li[i:i + 2] == ['a', 'c']:
>>         li[i:i + 2] = ['6']
> 
> Oh well, I have done a mistake, it seems.
> Another solution then:
> 
>>>> 'acaccgac'.replace("ac", chr(6))
> '\x06\x06cg\x06'
> 
> Bye,
> bearophile

Thanks bearophile and John for your quick answers.
Unfortunately, the int that can replace a sublist can be > 255, but 
John's answer looks simple and good enough for me. I will use it as a 
starting point.

Thank's again.

-- 
Matthias Gall?
Project Symbiose
Centre de Recherche INRIA Rennes - Bretagne Atlantique,
Campus de Beaulieu, 35042 Rennes cedex, France
tel: (33|0) 2 9984 7523
http://www.irisa.fr/symbiose/matthias_galle


From ross.jett at gmail.com  Mon May  4 10:01:07 2009
From: ross.jett at gmail.com (Ross)
Date: Mon, 4 May 2009 07:01:07 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
Message-ID: <16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com>

On May 3, 10:16?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 3, 11:29 pm, Chris Rebert <c... at rebertia.com> wrote:
>
> > Probably not the cause of the problem, but where
> > did the magic numbers 1.072 and 1.08 come from?
>
> It is perhaps not the most direct cause of the problem, in the sense
> that the magic numbers could take various values and the problem would
> still be there. ?But the magic numbers appear to be used for
> "spreading out" bye selection, and that's broken.
>
> The extended slice as written will always pick the first element,
> since the step is guaranteed to be positive. ?Since the first player
> (or None, when there are an odd number of players) stays put in the
> first position during the round_robin shuffle, that player will always
> be selected for a bye.
>
> Further, as written, the calculated number of byes has no bearing on
> the actual number of byes selected.
>
> I think what I would do is adjust the shuffling algorithm in such a
> way that everyone moves through the various positions in the list
> (would it be as simple as adding a shift at the end of
> round_robin???). ?Then I could simply select the byes from one end of
> the list (with a regular slice instead of an extended slice).
>
> John

The "magic numbers" that everyone is wondering about are indeed used
for spreading out the bye selection and I got them by simply
calculating a line of best fit when plotting several courts: byes
ratios.

The "byes = #whatever" in my code calculate the number of tuples that
need to be placed in the bye_list.

At first glance, the suggestion of adding a simple shift at the end of
round_robin doesn't seem to work since round_robin already shifts
everything except for the first position already. Please correct me if
I'm wrong because you might have been suggesting something different.


From ross.jett at gmail.com  Mon May  4 10:07:38 2009
From: ross.jett at gmail.com (Ross)
Date: Mon, 4 May 2009 07:07:38 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com>
Message-ID: <a0934ad7-e499-4ddf-abd8-c37c17a7f032@x6g2000vbg.googlegroups.com>

On May 4, 7:01?am, Ross <ross.j... at gmail.com> wrote:
> On May 3, 10:16?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
>
>
>
> > On May 3, 11:29 pm, Chris Rebert <c... at rebertia.com> wrote:
>
> > > Probably not the cause of the problem, but where
> > > did the magic numbers 1.072 and 1.08 come from?
>
> > It is perhaps not the most direct cause of the problem, in the sense
> > that the magic numbers could take various values and the problem would
> > still be there. ?But the magic numbers appear to be used for
> > "spreading out" bye selection, and that's broken.
>
> > The extended slice as written will always pick the first element,
> > since the step is guaranteed to be positive. ?Since the first player
> > (or None, when there are an odd number of players) stays put in the
> > first position during the round_robin shuffle, that player will always
> > be selected for a bye.
>
> > Further, as written, the calculated number of byes has no bearing on
> > the actual number of byes selected.
>
> > I think what I would do is adjust the shuffling algorithm in such a
> > way that everyone moves through the various positions in the list
> > (would it be as simple as adding a shift at the end of
> > round_robin???). ?Then I could simply select the byes from one end of
> > the list (with a regular slice instead of an extended slice).
>
> > John
>
> The "magic numbers" that everyone is wondering about are indeed used
> for spreading out the bye selection and I got them by simply
> calculating a line of best fit when plotting several courts: byes
> ratios.
>
> The "byes = #whatever" in my code calculate the number of tuples that
> need to be placed in the bye_list.
>
> At first glance, the suggestion of adding a simple shift at the end of
> round_robin doesn't seem to work since round_robin already shifts
> everything except for the first position already. Please correct me if
> I'm wrong because you might have been suggesting something different.

And also, as you all have pointed out, my inclusion of

> def test_round_robin(players, rounds, courts, doubles = False):
>     players = range(players)
>     for week in round_robin(players,rounds,courts):

should have been

> def test_round_robin(players, rounds, courts, doubles = False):
>     players = range(players)
>     for week in round_robin(players,rounds):

I forgot to erase that extra parameter when I was playing around with
my code.


From flamz3d at gmail.com  Mon May  4 10:09:20 2009
From: flamz3d at gmail.com (flamz3d at gmail.com)
Date: Mon, 4 May 2009 07:09:20 -0700 (PDT)
Subject: AutoComplete in C++ Editor for Python
References: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>
	<mailman.5011.1241378077.11746.python-list@python.org>
Message-ID: <10fef506-2c39-418c-82e8-5c0c05a19e5c@s31g2000vbp.googlegroups.com>

On May 3, 3:14?pm, Dave Angel <da... at ieee.org> wrote:
> flam... at gmail.com wrote:
> > Hello,
> > I am embedding python support in my C++ application and was looking at
> > adding "Intellisense" or "AutoComplete" support.
>
> > I found a way to do it using the "dir" function, but this creates a
> > problem. Here's why. Let's say I have the following code in my editor:
>
> > import sys
> > x = sys
>
> > Now, I would like to get all attributes of the object called 'x'. I
> > can "instrument" the code and add "print dir(x)" at the end,
> > temporarily redirect the python output to a string and execute the
> > code.
>
> > But this is not safe: I do NOT want to execute the code while the user
> > is typing!
>
> > Is there a way to "compile" the python code and get access to the
> > symbol table from that compiled block?
>
> > Did anybody ever implement AutoComplete in a editor for Python?
>
> > cheers.
>
> Several editors for Python support auto-complete, to one extent or
> another. ?The only one I have experience with is Komodo. ?Komodo runs in
> a separate process, so it doesn't suffer from the problems of having two
> gui event-loops in the same process, and other similar problems. ? It
> also won't be executing code that might have side effects in the child
> process.
>
> The downside is that in order to do auto-complete, it has to figure it
> out from other clues. ?From the docs, and from reading, and from
> experiementing, I believe that it uses two approaches. ?One approach is
> a set of language files which try to describe all the symbols in the
> standard language and library. ?They have one for each release (2.4,
> 2.5, ...) ?Theoretically, you could add your own for other libraries. ?
> Second approach is to parse the code that's visible to it. ?That parsing
> is well done, and surprisingly quick, but there are lots of tricks a
> developer might use that can fool it. ?For example, wxPython lets you
> import just one symbol, and lots more appear magically. ?It's no big
> deal, they have code structured one way, but the interface is very
> different. ?Catch is that code completion frequently gets fooled by these.
>
> I'd point out that if you do walk the dictionaries at run time, you'll
> get different results when you do it with nothing running than if you do
> a strictly static analysis. ?So some things might only show up if you've
> stepped into the function with the magic going on.
>
> Simplest example I can come up with of something a static analysis won't
> spot: ? An instance object ? ?obj ? may have some number of attributes
> assigned the the __init__() method. ?But it could also have new fields
> added by anyone with a referent into it.
>
> There is a Python parser in module ast. ?Perhaps that'd be some help. ?
> I've not used it, so can't give you any specifics.
>
> DaveA


I think it might be possible for me to figure out how to do
AutoCompletion using the symtable object. But I am having difficulty
making sense of it.

In my tests, I was use the following Python code:

[code]
import sys
x=sys
[/code]

The idea is to get the type of the variable x

To attempt this, I use the following C code (my editor is written in
C)

symtable* st = Py_SymtableString ( "import sys
\nx=sys,"<string>",Py_single_input);

PyObject *name, *value;
Py_ssize_t pos = 0;
while (PyDict_Next(st->st_symbols, &pos, &name, &value))
{
...
}



Using this code, I can get information like the name of the symbol
(x), but I can't figure out how to get the type. If I knew how to get
this it would solve 99% of my problems :)

Any ideas?


From apardon at forel.vub.ac.be  Mon May  4 10:25:44 2009
From: apardon at forel.vub.ac.be (Antoon Pardon)
Date: 4 May 2009 14:25:44 GMT
Subject: if statement, with function inside it: if (t = Test()) == True:
References: <d14b67f4-6b5e-4748-85f6-6d4f69353fa2@w40g2000yqd.googlegroups.com>
	<020183f4$0$20619$c3e8da3@news.astraweb.com>
Message-ID: <slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>

On 2009-04-24, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:
> On Fri, 24 Apr 2009 03:00:26 -0700, GC-Martijn wrote:
>
>> Hello,
>> 
>> I'm trying to do a if statement with a function inside it. I want to use
>> that variable inside that if loop , without defining it.
>> 
>> def Test():
>>     return 'Vla'
>> 
>> I searching something like this:
>> 
>> if (t = Test()) == 'Vla':
>>     print t # Vla
>> 
>> or
>> 
>> if (t = Test()):
>>     print t # Vla
>
> Fortunately, there is no way of doing that with Python. This is one 
> source of hard-to-debug bugs that Python doesn't have.

I think this is an unfortunate consequence of choosing '=' for the
assignment. They could have chosen an other token to indicate an
assignment one that would have made the difference between an
assignment and a comparison more visually different and thus
bugs by using one while needing the other less hard to track
down.

So when a certain kind of bug is hard to track down because of
the similarity of the tokens and not because of the specific
functionality I find it unfortunate they dropped the functionality
instead of making the tokens less similar.

-- 
Antoon Pardon


From bearophileHUGS at lycos.com  Mon May  4 10:53:03 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 07:53:03 -0700 (PDT)
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
	<mailman.5041.1241442097.11746.python-list@python.org> 
	<c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com> 
	<gtmsf0$se7$1@amma.irisa.fr>
Message-ID: <d821dc32-e870-4ff1-834e-91d0517f7620@s20g2000vbp.googlegroups.com>

Matthias Gall?:
>the int that can replace a sublist can be > 255,<

You didn't specify your integer ranges.
Probably there are many other solutions for your problem, but you have
to give more information. Like the typical array size, typical range
of the numbers, how much important is total memory used, how much
important is running speed, what kind of processing (or serialization/
output) you later have to do with such arrays, and so on.
Other solutions include using an array('H', []), and using 0-255 to
represent ASCII and numbers >255 <2^16 to represent the other numbers,
etc.
If speed is critical you can even think about creating a little
function with PyInline or D+Pyd, etc.

Bye,
bearophile


From gagsl-py2 at yahoo.com.ar  Mon May  4 10:57:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 04 May 2009 11:57:41 -0300
Subject: Default padding for Tkinter grid
References: <e534085e-8f6a-46e9-82d8-316eccfbf8f1@u10g2000vbd.googlegroups.com>
Message-ID: <op.uteuifvox6zn5v@gabriel.sleipnir-bsas>

En Mon, 04 May 2009 10:27:49 -0300, Amr <amrbekhit at gmail.com> escribi?:

> I've been spending the last few days experimenting with Tkinter. The
> grid manager is nice and easy to use, but I have found that I am often
> having to specify padx and pady options to every widget I add to my
> grid. The way I am doing it is to create a dictionary:
>
> paddding = {'padx': '1m', 'pady': '1m'}
>
> and then apply it to the grid method using **padding.
>
> However, I was wondering if there was a way of setting default padx
> and pady controls for the grid, so that I can just call grid without
> having to specify any extra parameters.

You have to call grid() once on every widget, so adding **padding at the  
end doesn't appear too bad to me:

   label = Label(master, text="Hello world!")
   widget.grid(row=3, col=1, **padding)

What about a function:

def grid_with_padding(widget, padx='1m', pady='1m', **kw):
   widget.grid(padx=padx, pady=pady, **kw)

If you want an uniform padding:

def add_padding(container, padx='1m', pady='1m'):
   nc, nr = container.grid_size()
   for i in range(nc):
     container.grid_columnconfigure(i, pad=padx)
   for i in range(nr):
     container.grid_rowconfigure(i, pad=pady)

-- 
Gabriel Genellina



From google at mrabarnett.plus.com  Mon May  4 11:09:16 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 16:09:16 +0100
Subject: find sublist inside list
In-Reply-To: <gtmsf0$se7$1@amma.irisa.fr>
References: <gtmlsk$q51$1@amma.irisa.fr>	<mailman.5041.1241442097.11746.python-list@python.org>	<c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com>
	<gtmsf0$se7$1@amma.irisa.fr>
Message-ID: <49FF051C.9080209@mrabarnett.plus.com>

Matthias Gall? wrote:
> bearophileHUGS at lycos.com wrote:
>> John O'Hagan:
>>> li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
>>> for i  in range(len(li)):
>>>     if li[i:i + 2] == ['a', 'c']:
>>>         li[i:i + 2] = ['6']
>>
>> Oh well, I have done a mistake, it seems.
>> Another solution then:
>>
>>>>> 'acaccgac'.replace("ac", chr(6))
>> '\x06\x06cg\x06'
>>
>> Bye,
>> bearophile
> 
> Thanks bearophile and John for your quick answers.
> Unfortunately, the int that can replace a sublist can be > 255, but 
> John's answer looks simple and good enough for me. I will use it as a 
> starting point.
> 
John's solution changes the length of the list over which it's
iterating.

I'd suggest something more like:

     li = ['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
     pos = 0
     try:
         while True:
             pos = li.index('a', pos)
             if li[pos : pos + 2] == ['a', 'c']:
                 li[pos : pos + 2] = [6]
             pos += 1
     except ValueError:
         pass


From amrbekhit at gmail.com  Mon May  4 11:10:38 2009
From: amrbekhit at gmail.com (Amr)
Date: Mon, 4 May 2009 08:10:38 -0700 (PDT)
Subject: Default padding for Tkinter grid
References: <e534085e-8f6a-46e9-82d8-316eccfbf8f1@u10g2000vbd.googlegroups.com>
	<mailman.5051.1241449065.11746.python-list@python.org>
Message-ID: <2c838b86-4eb3-4ca9-9ea5-6b0d23064d9b@v17g2000vbb.googlegroups.com>

On May 4, 3:57?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Mon, 04 May 2009 10:27:49 -0300, Amr <amrbek... at gmail.com> escribi?:
>
> > I've been spending the last few days experimenting with Tkinter. The
> > grid manager is nice and easy to use, but I have found that I am often
> > having to specify padx and pady options to every widget I add to my
> > grid. The way I am doing it is to create a dictionary:
>
> > paddding = {'padx': '1m', 'pady': '1m'}
>
> > and then apply it to the grid method using **padding.
>
> > However, I was wondering if there was a way of setting default padx
> > and pady controls for the grid, so that I can just call grid without
> > having to specify any extra parameters.
>
> You have to call grid() once on every widget, so adding **padding at the ?
> end doesn't appear too bad to me:
>
> ? ?label = Label(master, text="Hello world!")
> ? ?widget.grid(row=3, col=1, **padding)
>
> What about a function:
>
> def grid_with_padding(widget, padx='1m', pady='1m', **kw):
> ? ?widget.grid(padx=padx, pady=pady, **kw)
>
> If you want an uniform padding:
>
> def add_padding(container, padx='1m', pady='1m'):
> ? ?nc, nr = container.grid_size()
> ? ?for i in range(nc):
> ? ? ?container.grid_columnconfigure(i, pad=padx)
> ? ?for i in range(nr):
> ? ? ?container.grid_rowconfigure(i, pad=pady)
>
> --
> Gabriel Genellina

Hi Gabriel,

Thanks for your reply - I like the method you mention at the end,
using grid_columnconfigure and grid_rowconfigure as I can use that to
apply setting to the whole grid at the end. I'll have a mess around
with it.

--Amr


From soumen08 at gmail.com  Mon May  4 11:13:43 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Mon, 4 May 2009 20:43:43 +0530
Subject: IDE for python 2.6 (auto complete)
Message-ID: <f6a09c160905040813w6351f11bo41c0198835f7ece5@mail.gmail.com>

Hello,
I have just installed and run python 2.6.2 from the sources available
on the website. I notice that SPE (the editor which i used with python
2.5) is not displaying some of the functions new in 2.6 as
autocomplete options. Is there any IDE with support for autocomplete
in python 2.6 with all the newer functions included?


From showell30 at yahoo.com  Mon May  4 11:27:06 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 4 May 2009 08:27:06 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
Message-ID: <40fbffe5-a9dc-4a8c-a239-fa546c5ff2ef@z19g2000vbz.googlegroups.com>

On May 3, 3:39?pm, bearophileH... at lycos.com wrote:
> Sometimes I rename recursive functions, or I duplicate&modify them,
> and they stop working because inside them there's one or more copy of
> their old name.
> This happens to me more than one time every year.
> So I have written this:
>
> from inspect import getframeinfo, currentframe
>
> def SOMEVERYUGLYNAME(n):
> ? ? if n <= 1:
> ? ? ? ? return 1
> ? ? else:
> ? ? ? ? self_name = getframeinfo(currentframe()).function
> ? ? ? ? #self_name = getframeinfo(currentframe())[2] # older python
>
> ? ? ? ? # only if it's a global function
> ? ? ? ? #return n * globals()[self_name](n - 1)
> ? ? ? ? return n * eval(self_name + "(%d)" % (n - 1))
> assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6
>
> Are there nicer ways to do that? I don't know.
> If there aren't, then a way may be added.
> An idea-syntax:
>
> def fact(n):
> ? ? return 1 if n <= 1 else n * inspect.self(n - 1)
>
> Or even a lambda, because you don't need the name anymore to call the
> function:
>
> fact = lambda n: 1 if n <= 1 else n * self(n - 1)
>
> (If you have two or more recursive functions that call each other this
> idea can't be used, but I think such situations are uncommon enough to
> not deserve help from the language).
>

One very simple thing that you can do is assign the current function
name to a local var at the very top to make it a little more obvious.

I agree that there are lots of recursive patterns where python itself
does not provide much sugar.  A pattern that comes up for me
occasionally is two methods with almost identical names, where one
function is the public interface and then another method that does
most of the recursion.


From kyosohma at gmail.com  Mon May  4 11:46:03 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 4 May 2009 08:46:03 -0700 (PDT)
Subject: IDE for python 2.6 (auto complete)
References: <mailman.5053.1241450027.11746.python-list@python.org>
Message-ID: <6e840938-6180-44a8-8a1e-7f1660cfa2af@n8g2000vbb.googlegroups.com>

On May 4, 10:13?am, Soumen banerjee <soume... at gmail.com> wrote:
> Hello,
> I have just installed and run python 2.6.2 from the sources available
> on the website. I notice that SPE (the editor which i used with python
> 2.5) is not displaying some of the functions new in 2.6 as
> autocomplete options. Is there any IDE with support for autocomplete
> in python 2.6 with all the newer functions included?

Wingware probably does. You should just submit a bug report to Stani
though. He can probably fix SPE for you.

Mike


From ross.jett at gmail.com  Mon May  4 12:01:05 2009
From: ross.jett at gmail.com (Ross)
Date: Mon, 4 May 2009 09:01:05 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<a4aadd59-1d8a-40e0-b69d-d1d0ef9e01cf@x31g2000prc.googlegroups.com>
Message-ID: <4e49873c-9e74-4a3f-9070-2f245e6467c2@e20g2000vbc.googlegroups.com>

On May 3, 8:29?pm, John Machin <sjmac... at lexicon.net> wrote:
> On May 4, 12:36?pm, Ross <ross.j... at gmail.com> wrote:
>
>
>
> > For the past couple weeks, I've been working on an algorithm to
> > schedule tennis leagues given court constraints and league
> > considerations (i.e. whether it's a singles or a doubles league). Here
> > were my requirements when I was designing this algorithm:
>
> > -Each player plays against a unique opponent each week.
> > -Similarly, in a doubles league, each player plays with a unique
> > partner each week.
> > -Each player gets a fair number of bye weeks (i.e. the player with the
> > most bye weeks will have no more than one bye week than the player
> > with the least number of bye weeks)
>
> > I'm very close to arriving at my desired solution, but I have one
> > glaring flaw. When I have an even number of players sign up for my
> > league and there are court constraints, my current algorithm gives the
> > first player in my league a bye week every single week. I'll post my
> > code below and see how you guys think I should add to/ amend my code.
>
> > def round_robin(players, rounds):
> > ? ? if len(players)%2:
> > ? ? ? ? players.insert(0, None)
> > ? ? mid = len(players)//2
> > ? ? for i in range(rounds):
> > ? ? ? ? yield zip(players[:mid], players[mid:])
> > ? ? ? ? players = players[0:1] + players[mid:mid+1] + players[1:mid-1] +
> > players[mid+1:] + players[mid-1:mid]
>
> > def test_round_robin(players, rounds, courts, doubles = False):
> > ? ? players = range(players)
>
> DON'T change the type/contents/meaning of a variable name like that.
> E.g. use "nthings" for a number of things and "things" for a
> collection of things.
>
> > ? ? for week in round_robin(players,rounds,courts):
>
> The round_robin() function has only TWO arguments. This code won't
> even run.
>
> When you document neither your data structures nor what your functions
> are intended to do, the last hope for somebody trying to make sense of
> your code is to give meaningful names to your variables. "week" and
> "doubles_week" are NOT meaningful.
>
> > ? ? ? ? ? ? if doubles == True:
>
> Bletch. s/ == True//
>
> > ? ? ? ? ? ? ? ? ? ? doubles_week = len(week)/2.0
>
> I doubt very much that using floating point is a good idea here.
>
> > ? ? ? ? ? ? ? ? ? ? byes = doubles_week - courts
> > ? ? ? ? ? ? ? ? ? ? if byes == 0:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = []
> > ? ? ? ? ? ? ? ? ? ? else:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
>
> The derivation of the constants 1.072 and 1.08 is .... what?
>
> > ? ? ? ? ? ? ? ? ? ? playing = [u for u in week if u not in bye_list]
> > ? ? ? ? ? ? ? ? ? ? midd = len(playing)//2
> > ? ? ? ? ? ? ? ? ? ? doub_sched = zip(playing[:midd], playing[midd:])
> > ? ? ? ? ? ? ? ? ? ? print doub_sched, bye_list
> > ? ? ? ? ? ? else:
> > ? ? ? ? ? ? ? ? ? ? byes = len(week)- courts
> > ? ? ? ? ? ? ? ? ? ? if byes == 0:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = []
> > ? ? ? ? ? ? ? ? ? ? else:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
> > ? ? ? ? ? ? ? ? ? ? playing = [u for u in week if u not in bye_list]
> > ? ? ? ? ? ? ? ? ? ? print playing, bye_list

For everybody's enlightenment, I have gone through and commented my
code so you can better understand what I'm doing. Here it is:

def round_robin(players, rounds):
    # if number of players odd, insert None at first position
    if len(players)%2:
	players.insert(0, None)
    mid = len(players)//2
    for i in range(rounds):
	yield zip(players[:mid], players[mid:])
	players = players[0:1] + players[mid:mid+1] + players[1:mid-1] +
players[mid+1:] + players[mid-1:mid]
""" rotates players like this: 1 2  ->  3 -> 4

                                         /            |

                                       5 <- 6 <-7 <- 8 """

def test_round_robin(players, rounds, courts, doubles = False):
    players = range(players)
    for week in round_robin(players,rounds):
	    if doubles == True: #for doubles pairings
		    doubles_week = len(week)/2.0
		    byes = doubles_week - courts #number of tuples to be put into
bye_list
		    if byes == 0:
			    bye_list = []
		    else: """ following formula equally spaces out tuples selected
for bye_list and selects appropriate number according to length of the
league"""
			    bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
		    playing = [u for u in week if u not in bye_list]
		    midd = len(playing)//2
		    doub_sched = zip(playing[:midd], playing[midd:])#matches the
remaining tuples into doubles matches
		    print doub_sched, bye_list
	    else:
		    byes = len(week)- courts
		    if byes == 0:
			    bye_list = []
		    else:
			    bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
		    playing = [u for u in week if u not in bye_list]
		    print playing, bye_list


From mabdelkader at gmail.com  Mon May  4 12:03:42 2009
From: mabdelkader at gmail.com (ma)
Date: Mon, 4 May 2009 12:03:42 -0400
Subject: fcntl and siginfo_t in python
In-Reply-To: <148918f0905011208u4946c377uce7603bb2e456370@mail.gmail.com>
References: <148918f0904281356v534680dcmd03084fe255cb2d3@mail.gmail.com> 
	<op.us4mtvitx6zn5v@lepton.softlabbsas.com.ar>
	<148918f0904291012j4c1ada35jcee6030b75b952d0@mail.gmail.com> 
	<loom.20090430T233215-925@post.gmane.org>
	<148918f0904301637t5e63537atd85e2a475f4e069f@mail.gmail.com> 
	<148918f0905011208u4946c377uce7603bb2e456370@mail.gmail.com>
Message-ID: <148918f0905040903s7a5c7e5exc2968d0e65540d81@mail.gmail.com>

Ok! So, I decided to write a C-extension instead of using ctypes. So
far, I create a module called dnotifier and the handler callback
receives two arguments, the signal number and the respective file
descriptor that was modified.

This works beautifully. Now, I want to release this to the public, so
I'm thinking of making a bit of code cleanup. Should I just pack the
entire siginfo_t struct, right now I just use the fd, into a
dictionary and pass it to the python callback handler function? Maybe
there might be some more suggestions to what data structures to use,
so I'm open right now to any of them.

The siginfo_t structure is defined as follows in C:

union sigval {
	int sival_int;
	void *sival_ptr;
};

typedef struct {
	int si_signo;
	int si_code;
	union sigval si_value;
	int si_errno;
	pid_t si_pid;
	uid_t si_uid;
	void *si_addr;
	int si_status;
	int si_band;
} siginfo_t;

Thanks,
Mahmoud



On Fri, May 1, 2009 at 3:08 PM, ma <mabdelkader at gmail.com> wrote:
>
> According to man signal,
> "The default action for an unhandled real-time signal is to terminate
> the receiving process."
>
> This means that my registered callback and sigaction does not work. I
> think the only solution would be to try this with a C-extension. Has
> anyone had any experience with this before?
>
> I attached my latest copy. Any insight is appreciated.
>
> On Thu, Apr 30, 2009 at 7:37 PM, ma <mabdelkader at gmail.com> wrote:
> > I attached a clean copy of the .py file in case others couldn't read
> > it in their emails.
> > I'll try that and let you know how?SIGRTMIN+1 goes!
> > What about this part?
> >
> > #sigemptyset(&act.sa_mask);
> > #python2.6 has byref(act, offset),how can i port this over?
> > #maybe addressof(act)+sizeof(sigaction.sa_mask)*(position_in_sigaction)
> > rc = __clib.sigemptyset(byref(act))
> >
> > Thanks!
> > Mahmoud
> >
> >
> >
> > On Thu, Apr 30, 2009 at 7:33 PM, Philip <philip at subaru.naoj.org> wrote:
> >>
> >> ma <mabdelkader <at> gmail.com> writes:
> >>
> >> >
> >> >
> >> >
> >> >
> >> > Here's something that I came up with so far, I'm having some issues with
> >> segfaulting, if I want to pass a struct member by ref in ctypes(see below), if
> >> not, I just get a
> >> > "Real-time signal 0" sent back to me.
> >> >
> >> >
> >> > Any ideas?
> >>
> >> Try "SIGRTMIN+1", per http://souptonuts.sourceforge.net/code/dnotify.c.html
> >>
> >> Philip
> >>
> >>
> >>
> >> --
> >> http://mail.python.org/mailman/listinfo/python-list
> >


From matt at tplus1.com  Mon May  4 12:07:21 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Mon, 04 May 2009 16:07:21 GMT
Subject: How to walk up parent directories?
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
	<87ocu9k6c4.fsf@benfinney.id.au>
Message-ID: <ZoELl.21595$as4.10585@nlpi069.nbdc.sbc.com>

On Sun 03 May 2009 09:24:59 PM EDT, Ben Finney wrote:
> Not every simple function belongs in the standard library :-)

Thanks for the help with this!  Maybe I'm overestimating how often
people need this walkup function.

Matt


From velvetyuan at gmail.com  Mon May  4 12:14:28 2009
From: velvetyuan at gmail.com (Allan Yuan)
Date: Tue, 5 May 2009 00:14:28 +0800
Subject: Your confirmation is required to join the Python-list mailing 
	list
In-Reply-To: <mailman.0.1241452418.13411.python-list@python.org>
References: <mailman.0.1241452418.13411.python-list@python.org>
Message-ID: <7be934440905040914t699a0e70s62671f299961ac6@mail.gmail.com>

Hi,
I just wanna know how to set SYSTEM variables and USER variables of windows,
but got no way.

Firstly I thought "os.environ + os.system" may work well, but found no way
to let "os.environ" run to retrive USER variables.

Then I tried win32api, finding the GetEnvironmentVariables() mixing SYSTEM
and USER variables up, and SetEnvironmentVariables() failing to add
variables.

Could you help me, please?
Thanks a lot.
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From aahz at pythoncraft.com  Mon May  4 12:15:18 2009
From: aahz at pythoncraft.com (Aahz)
Date: 4 May 2009 09:15:18 -0700
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
Message-ID: <gtn4am$89$1@panix3.panix.com>

In article <8d4ec1df-dddb-469a-99a1-695152db7c04 at n4g2000vba.googlegroups.com>,
Ross  <ross.jett at gmail.com> wrote:
>
>def test_round_robin(players, rounds, courts, doubles = False):
>    players = range(players)
>    for week in round_robin(players,rounds,courts):
>	    if doubles == True:
>		    doubles_week = len(week)/2.0
>		    byes = doubles_week - courts

Side note: thou shalt indent four spaces, no more, no fewer

For more info, see PEP 8.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From aahz at pythoncraft.com  Mon May  4 12:25:17 2009
From: aahz at pythoncraft.com (Aahz)
Date: 4 May 2009 09:25:17 -0700
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
Message-ID: <gtn4td$83h$1@panix3.panix.com>

In article <gtmlsk$q51$1 at amma.irisa.fr>,
=?ISO-8859-1?Q?Matthias_Gall=E9?=  <mgalle at irisa.fr> wrote:
>
>My problem is to replace all occurrences of a sublist with a new element.
>
>Example:
>Given ['a','c','a','c','c','g','a','c'] I want to replace all 
>occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).

What's your goal?  After you do this once, you cannot repeat the
operation with a different sublist because you are not tracking the
source of the numbers.  You might look into standard compression
algorithms for information about how to accomplish this.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From oshecho at gmail.com  Mon May  4 12:58:57 2009
From: oshecho at gmail.com (Echo)
Date: Mon, 4 May 2009 12:58:57 -0400
Subject: How is the start of my server monitoring code?
Message-ID: <910885da0905040958n1b62361ei4633d2b86fb3adae@mail.gmail.com>

I just started a project to monitor servers(load, memory, processes,
etc) via ssh(using?paramiko). And I was hoping to get some input on
the design of my project, how pythonic it is, etc. It is quite basic
right now. But it is currently able to get load and memory stats from
any number of servers. I haven't started the logging to a DB or the
GUI for it yet. I also haven't touched on error handling at all
either.

My reasons for making my own server monitoring project:
-It's fun
-Low requirements (only python, paramiko, and pycrypto 1.9+ is required)
-Nothing to install on the servers
-Easy to customize

You can view the code at:
http://github.com/brandonsinger/pywatchlmn/blob/43afb593a891a3d25f3cd9910c5829867bbe229d/monitor.py
The project page is at: http://github.com/brandonsinger/pywatchlmn/tree/master

--
-Brandon Singer


From v+python at g.nevcal.com  Mon May  4 13:09:42 2009
From: v+python at g.nevcal.com (Glenn Linderman)
Date: Mon, 04 May 2009 10:09:42 -0700
Subject: [ANN] regobj - Pythonic object-based access to the Windows
	Registry
In-Reply-To: <1241361308.4359.9.camel@mango>
References: <1241361308.4359.9.camel@mango>
Message-ID: <49FF2156.6010909@g.nevcal.com>

On approximately 5/3/2009 7:35 AM, came the following characters from 
the keyboard of Ryan Kelly:
> Hi All,
> 
>   I've just released the results of a nice Sunday's coding, inspired by
> one too many turns at futzing around with the _winreg module.  The
> "regobj" module brings a convenient and clean object-based API for
> accessing the Windows Registry.


Sounds very interesting, Ryan.  Just a couple questions about the 
dictionary interface.


> If a subkey is assigned a dictionary, the structure of that dictionary
> is copied into the subkey.  Scalar values become key values, while
> nested  dictionaries create subkeys:
> 
>   >>> HKCU.Software.MyTests = {"val1":7, "stuff":{"a":1,"c":2,"e":3}}
>   >>> [v.name for v in HKCU.Software.MyTests.values()]
>   ['val1']
>   >>> [k.name for k in HKCU.Software.MyTests.subkeys()]
>   ['stuff']
>   >>> len(HKCU.Software.MyTests.stuff)
>   3
> 
> Any other value assigned to a subkey will become the default value for
> that key (i.e. the value with name ""):
> 
>   >>> HKCU.Software.MyTests = "dead parrot"
>   >>> HKCU.Software.MyTests[""].data
>   u'dead parrot'


I could see how you could map  numbers to DWORD, 2.x str/3.x bytes to 
binary, and 2.x unicode/3.x str to REG_SZ.  But you don't document such 
a translation, so it is unclear exactly what you actually do.  This 
would be somewhat weird in 2.x, though, where str commonly would want to 
map to String rather than Binary.

It seems almost necessary to add an explanation of whatever mapping is 
presently done, to have complete documentation.



Thinking more, I wonder if it is possible to create objects of type 
Value to put in the dictionary to allow specification of multistring and 
expandablestring Registry types, but then the dictionary name would have 
to be redundant with the name attribute in the Value object.  Maybe a 
nameless value type could be invented, with just type and data attributes?

Then the dictionary could be populated with numbers (mapped to DWORD) 
str or unicode items (mapped to String), [3.x only] bytes (mapped to 
Binary), or nameless value objects (which map to their internal types).



This would allow a bidirectional conversion between dictionaries and 
registry keys... when asking for the value of a key, one could return a 
dictionary of nameless value types... and allow iterations over that.

Subkeys could be a tuple with the type of key, and the value of a key 
object.


Well, these are just thoughts.  I don't know if they would increase or 
decrease the Pythonicity of your design, which certainly sounds better 
than using _winreg, to me.


-- 
Glenn -- http://nevcal.com/
===========================
A protocol is complete when there is nothing left to remove.
-- Stuart Cheshire, Apple Computer, regarding Zero Configuration Networking


From aahz at pythoncraft.com  Mon May  4 13:17:05 2009
From: aahz at pythoncraft.com (Aahz)
Date: 4 May 2009 10:17:05 -0700
Subject: replacing numbers in LARGE MATRIX with criterium in 2 columns
	(a--> b)
References: <68d22002-fc0a-4590-9395-c78b6ee412b2@r34g2000vba.googlegroups.com>
Message-ID: <gtn7uh$ikk$1@panix3.panix.com>

In article <68d22002-fc0a-4590-9395-c78b6ee412b2 at r34g2000vba.googlegroups.com>,
Alexzive  <zasaconsulting at gmail.com> wrote:
>
>I have this matrix [20*4 - but it could be n*4 , with n~100,000] in
>file "EL_list" like this:

Take a look at NumPy
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From detlev at die-offenbachs.de  Mon May  4 13:29:36 2009
From: detlev at die-offenbachs.de (Detlev Offenbach)
Date: Mon, 04 May 2009 19:29:36 +0200
Subject: IDE for python 2.6 (auto complete)
References: <mailman.5053.1241450027.11746.python-list@python.org>
	<6e840938-6180-44a8-8a1e-7f1660cfa2af@n8g2000vbb.googlegroups.com>
Message-ID: <gtn8m0$5ek$1@online.de>

Mike Driscoll wrote:

> On May 4, 10:13?am, Soumen banerjee <soume... at gmail.com> wrote:
>> Hello,
>> I have just installed and run python 2.6.2 from the sources available
>> on the website. I notice that SPE (the editor which i used with python
>> 2.5) is not displaying some of the functions new in 2.6 as
>> autocomplete options. Is there any IDE with support for autocomplete
>> in python 2.6 with all the newer functions included?
> 
> Wingware probably does. You should just submit a bug report to Stani
> though. He can probably fix SPE for you.

And eric4 does this as well.

Detlev
-- 
Detlev Offenbach
detlev at die-offenbachs.de


From Florian.Wollenschein at FernUni-Hagen.de  Mon May  4 13:31:38 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Mon, 04 May 2009 19:31:38 +0200
Subject: Open a dialog from MainWindow - pyQT4 - Beginner :-)
Message-ID: <gtn8q6$e55$1@news-cedar.fernuni-hagen.de>

Dear folks,

I'm just working on a pyQT4 version of my txt to html converter thc (see 
listick.org for details).

I created the MainWindow with QT Designer and then converted it to .py 
with pyuic4. It works well so far. Then I created a new UI for my 
abtDialog (about dialog for my application). I did the same as with the 
MainWindow, so I have two UIs and two *_ui.py files now. How can I open 
the dialog from my main application class?

Here's part of the code I'm using:

...
self.connect(self.actionAbout,
                 QtCore.SIGNAL("triggered()"), self.OpenAbout)
...
  def OpenAbout(self):
         pass
...

The OpenAbout function should open the dialog. I've already tried a 
abtDialog.show() after creating it via abtDialog = ThcAboutDialog() 
(ThcAboutDialog is the class for this dlg).

Any ideas?

Thanks,
Listick Lorch
http://www.listick.org

PS: Keep in mind that I'm quite a beginner in the field of python and qt...


From mail at johnohagan.com  Mon May  4 13:33:40 2009
From: mail at johnohagan.com (John O'Hagan)
Date: Mon, 4 May 2009 17:33:40 +0000
Subject: find sublist inside list
In-Reply-To: <79b79e730905040613y5ba8e36wb27e66260f06247@mail.gmail.com>
References: <gtmlsk$q51$1@amma.irisa.fr>
	<200905041301.36962.mail@johnohagan.com>
	<79b79e730905040613y5ba8e36wb27e66260f06247@mail.gmail.com>
Message-ID: <200905041733.41172.mail@johnohagan.com>

On Mon, 4 May 2009, Francesco Guerrieri wrote:
> On Mon, May 4, 2009 at 3:01 PM, John O'Hagan <mail at johnohagan.com> wrote:
> > On Mon, 4 May 2009, Matthias Gall? wrote:
> > > Hi.
> > >
> > > My problem is to replace all occurrences of a sublist with a new
> > > element.
> > >
> > > Example:
> > > Given ['a','c','a','c','c','g','a','c'] I want to replace all
> > > occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).
> >
> > li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
> > for i  in range(len(li)):
> >    if li[i:i + 2] == ['a', 'c']:
> >        li[i:i + 2] = ['6']
> >
> > HTH,
> >
> > John
>
> Beware that you are mutating the list you are iterating over. That could
> lead to some strange bugs (for instance if you replaced the deleted items
> with a longer sequence, the range(len(li)) would still go up to the
> original lenght).
> It is better to modify a new list instead. Eg you could append to a new
> list.
[...]

Quite right, while it happens to work in this particular example, as you and 
MRAB point out, it's generally dangerous (and in fact this one silently and 
uselessly iterates over the last couple of indexes which no longer exist); a 
new list could be created like this:

index=0
newli=[]
while index<len(li):
    if li[index:index+2]==['a', 'c']:
        newli.append(6)
        index += 2
    else:
        newli.append(li[index])
        index += 1

Regards,

John




From debatem1 at gmail.com  Mon May  4 13:36:34 2009
From: debatem1 at gmail.com (CTO)
Date: Mon, 4 May 2009 10:36:34 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
	<bea7d12e-2bda-4ec6-868b-440b79bd28e4@21g2000vbk.googlegroups.com> 
	<mailman.5014.1241386734.11746.python-list@python.org>
	<4b87a84a-eef0-42cb-91f7-6ade662bdd4d@t10g2000vbg.googlegroups.com>
	<767pt4F1ai5lsU1@mid.uni-berlin.de>
Message-ID: <dfd5cc95-173d-40d4-b7f4-a4e4f351dfb3@l28g2000vba.googlegroups.com>

> Which brings us backs to the "20 questions"-part of my earlier post. It
> could be, but it could also be that processing takes seconds. Or it takes
> so long that even concurrency won't help. Who knows?

Probably the OP ;)

Geremy Condra



From grettke at gmail.com  Mon May  4 14:06:06 2009
From: grettke at gmail.com (Grant Rettke)
Date: Mon, 4 May 2009 11:06:06 -0700 (PDT)
Subject: Personal recommendations for Python and Django on-boarding materials
Message-ID: <61ac6511-0f9e-458d-b3f1-5b153939293f@r34g2000vba.googlegroups.com>

Hi folks,

>From one developer to another, I am looking for some personal
recommendations on what are the best materials for fast tracking an on-
boarding to Python and Django.

I know how to program, get web apps and OO; this is the audience.

I have found some good recommendations and stuff on Amazon and various
websites, but if I could get some humans vouching for things directly
that would be worth a lot more.

Best wishes,

Grant


From jsanga at cox.net  Mon May  4 14:12:41 2009
From: jsanga at cox.net (mzdude)
Date: Mon, 4 May 2009 11:12:41 -0700 (PDT)
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
	<mailman.5041.1241442097.11746.python-list@python.org> 
	<c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com> 
	<gtmsf0$se7$1@amma.irisa.fr>
Message-ID: <b1f47eb5-22a6-491c-b6db-bda94c934b23@l28g2000vba.googlegroups.com>

On May 4, 9:01?am, Matthias Gall? <mga... at irisa.fr> wrote:
> bearophileH... at lycos.com wrote:
> > John O'Hagan:
> >> li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
> >> for i ?in range(len(li)):
> >> ? ? if li[i:i + 2] == ['a', 'c']:
> >> ? ? ? ? li[i:i + 2] = ['6']
>
> > Oh well, I have done a mistake, it seems.
> > Another solution then:
>
> >>>> 'acaccgac'.replace("ac", chr(6))
> > '\x06\x06cg\x06'
>
> > Bye,
> > bearophile
>
> Thanks bearophile and John for your quick answers.
> Unfortunately, the int that can replace a sublist can be > 255, but
> John's answer looks simple and good enough for me. I will use it as a
> starting point.
>

substring isn't limited to 0..255
>>> substring = "\0x%d\0x%d" % (257,257)
>>> 'acaccgac'.replace("ac", substring)
'\x00x257\x00x257\x00x257\x00x257cg\x00x257\x00x257'


From grahamdick77 at gmail.com  Mon May  4 14:15:13 2009
From: grahamdick77 at gmail.com (grahamdick77 at gmail.com)
Date: Mon, 4 May 2009 11:15:13 -0700 (PDT)
Subject: improved search algorithm
Message-ID: <ab9b08e3-63d6-4519-b6d7-fb4d964734c7@g20g2000vba.googlegroups.com>

Hi

I have an excel file that is read into python (8000 rows)

from csv        import reader, writer
incsv = reader(open(MY_FILE), dialect='excel')
keys = incsv.next()

There are mixed datatypes.

the last column contains a cumulative frequency running in order
0.0000 to 1.0000 for the 8000 rows

for a loop of 100,000 times I want to take a new random number each
time and find the row with the next biggest cumulative frequency value

Here's my current (pseudo)code:

for 1 to 100000

myRand = random.random()
for line in incsv:
            if float(line[-1]) > myRand:
                resline = []
                for item in line:
                    try:
                        i = int(item)
                    except ValueError:
                        try:
                            i = float(item)
                        except ValueError:
                            i = item
                    resline.append(i)
                #Here we construct a dict of pair values:
                #{'ID':18,...
                res = dict(zip(keys,resline))
                break
            else:
                continue

      #do some stuff with res




I'm scanning over each line of the csv and deciding which row to
select (100k times) this is just not very efficient

How can i improve this code.
for line in incsv:
            if float(line[-1]) > random.random():

I can use numpy etc. whatever


From bearophileHUGS at lycos.com  Mon May  4 14:26:25 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 11:26:25 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<40fbffe5-a9dc-4a8c-a239-fa546c5ff2ef@z19g2000vbz.googlegroups.com>
Message-ID: <202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>

Steve Howell:
>two methods with almost identical names, where one function is the public interface and then another method that does most of the recursion.<

Thanks Guido & Walter both Python and D support nested functions, so
in such situations I put the recursive function inside the "public
interface" function/method.

Recursion is a high-level way to represent certain kinds of algorithms
in a short and readable way (when data structures are nested, the most
natural algorithms that work on them are recursive). But in Python
function calls are slow, the maximum level of nested calls is limited
(and it can't grow too much), so this has sometimes forced me to
manually convert recursive functions into iterative ones with a stack.
This is silly for a supposed high-level language. The bad support for
recursivity is one of the few faults of Python.

Bye,
bearophile


From qhfgva at gmail.com  Mon May  4 14:27:13 2009
From: qhfgva at gmail.com (qhfgva)
Date: Mon, 4 May 2009 11:27:13 -0700 (PDT)
Subject: pychecker vs pychecker2
Message-ID: <c4529fae-7d75-429d-87ef-8210969c2ad8@p6g2000pre.googlegroups.com>

For my edification I was looking through the source code of
pychecker.  I noticed that there was also a pychecker2 directory
(ubuntu).  The pychecker command line tool points to pychecker (w/out
the 2).  Does anyone know off the top of their head what this second
directory is about?

thanks

qhfgva


From umut.tabak at gmail.com  Mon May  4 14:42:04 2009
From: umut.tabak at gmail.com (utab)
Date: Mon, 4 May 2009 11:42:04 -0700 (PDT)
Subject: change some lines from a read file
Message-ID: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>

Dear all,

I have to change some lines from a template file, which is rather long
to paste here, but I would like to make some parts of some lines
optional with my command line arguments but I could not see this
directly, I can count the line numbers and decide on this basis to
decide the lines to be configured to my will.

More specifically, say, I have a that file includes

this is an example python file to play around
.
.
.
some lines
.
.
.
. -> an option line for example.
.
.
.
-> another option line so on.

and execute the script
./myScript option1 option2

so that the options at correct locations will be written.

Any other options for this simple job that i can improve my Python a
bit as well.

Best,
Umut


From google at mrabarnett.plus.com  Mon May  4 14:45:23 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 19:45:23 +0100
Subject: improved search algorithm
In-Reply-To: <ab9b08e3-63d6-4519-b6d7-fb4d964734c7@g20g2000vba.googlegroups.com>
References: <ab9b08e3-63d6-4519-b6d7-fb4d964734c7@g20g2000vba.googlegroups.com>
Message-ID: <49FF37C3.2040809@mrabarnett.plus.com>

grahamdick77 at gmail.com wrote:
> Hi
> 
> I have an excel file that is read into python (8000 rows)
> 
> from csv        import reader, writer
> incsv = reader(open(MY_FILE), dialect='excel')
> keys = incsv.next()
> 
> There are mixed datatypes.
> 
> the last column contains a cumulative frequency running in order
> 0.0000 to 1.0000 for the 8000 rows
> 
> for a loop of 100,000 times I want to take a new random number each
> time and find the row with the next biggest cumulative frequency value
> 
> Here's my current (pseudo)code:
> 
> for 1 to 100000
> 
> myRand = random.random()
> for line in incsv:
>             if float(line[-1]) > myRand:
>                 resline = []
>                 for item in line:
>                     try:
>                         i = int(item)
>                     except ValueError:
>                         try:
>                             i = float(item)
>                         except ValueError:
>                             i = item
>                     resline.append(i)
>                 #Here we construct a dict of pair values:
>                 #{'ID':18,...
>                 res = dict(zip(keys,resline))
>                 break
>             else:
>                 continue
> 
>       #do some stuff with res
> 
> 
> 
> 
> I'm scanning over each line of the csv and deciding which row to
> select (100k times) this is just not very efficient
> 
> How can i improve this code.
> for line in incsv:
>             if float(line[-1]) > random.random():
> 
> I can use numpy etc. whatever
> 
Here's a suggestion:

Construct the dicts for all the rows, stored in a list.

Construct a list of just the cumulative frequencies.

For each random value, use the bisect module to search for the value in
the cumulative frequencies list. This will return an index which you can
then use on your list of dicts.


From arnodel at googlemail.com  Mon May  4 14:51:03 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 04 May 2009 19:51:03 +0100
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<40fbffe5-a9dc-4a8c-a239-fa546c5ff2ef@z19g2000vbz.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
Message-ID: <m2ocu8r9bc.fsf@googlemail.com>

bearophileHUGS at lycos.com writes:

> Steve Howell:
>>two methods with almost identical names, where one function is the
>>public interface and then another method that does most of the
>>recursion.<
>
> Thanks Guido & Walter both Python and D support nested functions, so
> in such situations I put the recursive function inside the "public
> interface" function/method.

Yes, this is a common idiom for me:

def public_function(a, b):
    def rec():
        ...
    return rec()

E.g, to continue with the factorial toy example (of course for this
particular example and in this particular language, a loop would be more
appropriate):

def fac(n):
    def rec(n, acc):
        if n <= 1:
            return acc
        else:
            return rec(n - 1, n*acc)
    return rec(n, 1)

This is tail recursive, but Python does not optimise tail-calls so there
is not much point.

> Recursion is a high-level way to represent certain kinds of algorithms
> in a short and readable way (when data structures are nested, the most
> natural algorithms that work on them are recursive). But in Python
> function calls are slow, the maximum level of nested calls is limited
> (and it can't grow too much), so this has sometimes forced me to
> manually convert recursive functions into iterative ones with a stack.
> This is silly for a supposed high-level language. The bad support for
> recursivity is one of the few faults of Python.

Bearophile, there is a thread on python-ideas about tail-call
optimization at the moment.

-- 
Arnaud


From google at mrabarnett.plus.com  Mon May  4 14:59:37 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 19:59:37 +0100
Subject: change some lines from a read file
In-Reply-To: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
References: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
Message-ID: <49FF3B19.7070907@mrabarnett.plus.com>

utab wrote:
> Dear all,
> 
> I have to change some lines from a template file, which is rather long
> to paste here, but I would like to make some parts of some lines
> optional with my command line arguments but I could not see this
> directly, I can count the line numbers and decide on this basis to
> decide the lines to be configured to my will.
> 
> More specifically, say, I have a that file includes
> 
> this is an example python file to play around
> .
> .
> .
> some lines
> .
> .
> .
> . -> an option line for example.
> .
> .
> .
> -> another option line so on.
> 
> and execute the script
> ./myScript option1 option2
> 
> so that the options at correct locations will be written.
> 
> Any other options for this simple job that i can improve my Python a
> bit as well.
> 
You could put special markers around the optional parts in the template
file. Your script would remove the markers from around the optional
parts it wants to keep and then remove any remaining unwanted optional
parts and their markers.


From bearophileHUGS at lycos.com  Mon May  4 15:12:19 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 12:12:19 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<40fbffe5-a9dc-4a8c-a239-fa546c5ff2ef@z19g2000vbz.googlegroups.com> 
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
Message-ID: <cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>

Arnaud Delobelle:
> def fac(n):
> ? ? def rec(n, acc):
> ? ? ? ? if n <= 1:
> ? ? ? ? ? ? return acc
> ? ? ? ? else:
> ? ? ? ? ? ? return rec(n - 1, n*acc)
> ? ? return rec(n, 1)

Right, that's another way to partially solve the problem I was talking
about. (Unfortunately the performance in Python is significantly
lower. I can use that in D).


> Bearophile, there is a thread on python-ideas about tail-call
> optimization at the moment.

Someday I'll have to start following those mailing lists...
But I am not interested in such optimization. It's not going to help
me significantly. Most times I use recursion, I think it can't be
optimized away by simple means (think about a visit to a binary tree).

Bye,
bearophile


From aahz at pythoncraft.com  Mon May  4 15:50:18 2009
From: aahz at pythoncraft.com (Aahz)
Date: 4 May 2009 12:50:18 -0700
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
Message-ID: <gtngtq$m5l$1@panix3.panix.com>

In article <cee041da-a1e0-4d82-b4ba-5404811d3edd at t10g2000vbg.googlegroups.com>,
 <bearophileHUGS at lycos.com> wrote:
>Arnaud Delobelle:
>> 
>> Bearophile, there is a thread on python-ideas about tail-call
>> optimization at the moment.
>
>Someday I'll have to start following those mailing lists...
>But I am not interested in such optimization. It's not going to help
>me significantly. Most times I use recursion, I think it can't be
>optimized away by simple means (think about a visit to a binary tree).

When have you ever had a binary tree a thousand levels deep?  Consider
how big 2**1000 is...
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From arnodel at googlemail.com  Mon May  4 15:51:45 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 04 May 2009 20:51:45 +0100
Subject: Personal recommendations for Python and Django on-boarding
	materials
References: <61ac6511-0f9e-458d-b3f1-5b153939293f@r34g2000vba.googlegroups.com>
Message-ID: <m2k54wr6i6.fsf@googlemail.com>

Grant Rettke <grettke at gmail.com> writes:

> Hi folks,
>
> From one developer to another, I am looking for some personal
> recommendations on what are the best materials for fast tracking an on-
> boarding to Python and Django.
>
> I know how to program, get web apps and OO; this is the audience.
>
> I have found some good recommendations and stuff on Amazon and various
> websites, but if I could get some humans vouching for things directly
> that would be worth a lot more.
>
> Best wishes,
>
> Grant

I've learnt both Python and Django using the tutorials, the docs and
lots of experimentation.  Django now have a book [1] which might be
useful to read.

[1] http://djangobook.com/

-- 
Arnaud



From anthra.norell at bluewin.ch  Mon May  4 16:06:51 2009
From: anthra.norell at bluewin.ch (Anthra Norell)
Date: Mon, 04 May 2009 22:06:51 +0200
Subject: change some lines from a read file
In-Reply-To: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
References: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
Message-ID: <49FF4ADB.5020101@bluewin.ch>

utab wrote:
> Dear all,
>
> I have to change some lines from a template file, which is rather long
> to paste here, but I would like to make some parts of some lines
> optional with my command line arguments but I could not see this
> directly, I can count the line numbers and decide on this basis to
> decide the lines to be configured to my will.
>
> More specifically, say, I have a that file includes
>
> this is an example python file to play around
> .
> .
> .
> some lines
> .
> .
> .
> . -> an option line for example.
> .
> .
> .
> -> another option line so on.
>
> and execute the script
> ./myScript option1 option2
>
> so that the options at correct locations will be written.
>
> Any other options for this simple job that i can improve my Python a
> bit as well.
>
> Best,
> Umut
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   
Your description is not explicit enough to convey your intention. If 
your template file is too long to post, post a short representative 
section, an input data sample and a hand-edited sample of the output 
data you want to generate. You will get more and better advice. .

Frederic



From namekuseijin at gmail.com  Mon May  4 16:18:10 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Mon, 4 May 2009 13:18:10 -0700 (PDT)
Subject: yet another list comprehension question
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
	<gtm1ik$19tj$1@adenine.netfront.net>
	<mailman.5039.1241439352.11746.python-list@python.org>
Message-ID: <f0b70e0d-31c2-4d95-bec4-0e57e5d3a860@o14g2000vbo.googlegroups.com>

On May 4, 9:15?am, David Robinow <drobi... at gmail.com> wrote:
> On Mon, May 4, 2009 at 2:33 AM, namekuseijin
>
> <namekuseijin.nos... at gmail.com> wrote:
> >>>> ls = [(1,2), (3,4), (5, None), (6,7), (8, None)]
> >>>> [(x,y) for (x,y) in ls if y]
> > [(1, 2), (3, 4), (6, 7)]
>
> Nope. That filters out 0 as well as None. Not what the OP asked for.

True.  I'm still a C programmer at heart I guess.  ah, the flexibility
of 0... ;)


From tim.wintle at teamrubber.com  Mon May  4 16:24:36 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 04 May 2009 21:24:36 +0100
Subject: Self function
In-Reply-To: <m2ocu8r9bc.fsf@googlemail.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<40fbffe5-a9dc-4a8c-a239-fa546c5ff2ef@z19g2000vbz.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
Message-ID: <1241468676.7670.11.camel@tim-laptop>

On Mon, 2009-05-04 at 19:51 +0100, Arnaud Delobelle wrote:
> 
> Bearophile, there is a thread on python-ideas about tail-call
> optimization at the moment.

Oooh - haven't noticed that (and don't have time to follow it), but has
anyone seen the results I got a week or so ago from briefly playing with
a couple of simple optimisations:

<http://www.teamrubber.com/blog/python-tail-optimisation-using-byteplay/>

I was amazed how much you could improve performance by not jumping all
over the stack


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From bearophileHUGS at lycos.com  Mon May  4 16:25:59 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 13:25:59 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
Message-ID: <8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>

Aahz:
> When have you ever had a binary tree a thousand levels deep?

Yesterday.


>Consider how big 2**1000 is...<

You are thinking just about complete binary trees.
But consider that a topology like a single linked list (every node has
1 child, and they are chained) is a true binary tree still.

Bye,
bearophile


From ross.jett at gmail.com  Mon May  4 16:27:27 2009
From: ross.jett at gmail.com (Ross)
Date: Mon, 4 May 2009 13:27:27 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<gtn4am$89$1@panix3.panix.com>
Message-ID: <58fea998-acf1-46b5-9328-bc3cbd74f115@n4g2000vba.googlegroups.com>

On May 4, 12:15?pm, a... at pythoncraft.com (Aahz) wrote:
> In article <8d4ec1df-dddb-469a-99a1-695152db7... at n4g2000vba.googlegroups.com>,
>
> Ross ?<ross.j... at gmail.com> wrote:
>
> >def test_round_robin(players, rounds, courts, doubles = False):
> > ? ?players = range(players)
> > ? ?for week in round_robin(players,rounds,courts):
> > ? ? ? ?if doubles == True:
> > ? ? ? ? ? ? ? ?doubles_week = len(week)/2.0
> > ? ? ? ? ? ? ? ?byes = doubles_week - courts
>
> Side note: thou shalt indent four spaces, no more, no fewer
>
> For more info, see PEP 8.
> --
> Aahz (a... at pythoncraft.com) ? ? ? ? ? <*> ? ? ? ?http://www.pythoncraft.com/
>
> "It is easier to optimize correct code than to correct optimized code."
> --Bill Harlan

Yes... I know this. Unfortunately, copy/pasting my code from the IDE
into the google group messes with indentations.


From davea at ieee.org  Mon May  4 16:38:41 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 04 May 2009 16:38:41 -0400
Subject: AutoComplete in C++ Editor for Python
In-Reply-To: <10fef506-2c39-418c-82e8-5c0c05a19e5c@s31g2000vbp.googlegroups.com>
References: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>	<mailman.5011.1241378077.11746.python-list@python.org>
	<10fef506-2c39-418c-82e8-5c0c05a19e5c@s31g2000vbp.googlegroups.com>
Message-ID: <49FF5251.2010303@ieee.org>

flamz3d at gmail.com wrote:
> On May 3, 3:14 pm, Dave Angel <da... at ieee.org> wrote:
>   
>> flam... at gmail.com wrote:
>>     
>>> Hello,
>>> I am embedding python support in my C++ application and was looking at
>>> adding "Intellisense" or "AutoComplete" support.
>>>       
>>> I found a way to do it using the "dir" function, but this creates a
>>> problem. Here's why. Let's say I have the following code in my editor:
>>>       
>>> import sys
>>> x =ys
>>>       
>>> Now, I would like to get all attributes of the object called 'x'. I
>>> can "instrument" the code and add "print dir(x)" at the end,
>>> temporarily redirect the python output to a string and execute the
>>> code.
>>>       
>>> But this is not safe: I do NOT want to execute the code while the user
>>> is typing!
>>>       
>>> Is there a way to "compile" the python code and get access to the
>>> symbol table from that compiled block?
>>>       
>>> Did anybody ever implement AutoComplete in a editor for Python?
>>>       
>>> cheers.
>>>       
>> Several editors for Python support auto-complete, to one extent or
>> another.  The only one I have experience with is Komodo.  Komodo runs in
>> a separate process, so it doesn't suffer from the problems of having two
>> gui event-loops in the same process, and other similar problems.   It
>> also won't be executing code that might have side effects in the child
>> process.
>>
>> The downside is that in order to do auto-complete, it has to figure it
>> out from other clues.  From the docs, and from reading, and from
>> experiementing, I believe that it uses two approaches.  One approach is
>> a set of language files which try to describe all the symbols in the
>> standard language and library.  They have one for each release (2.4,
>> 2.5, ...)  Theoretically, you could add your own for other libraries.  
>> Second approach is to parse the code that's visible to it.  That parsing
>> is well done, and surprisingly quick, but there are lots of tricks a
>> developer might use that can fool it.  For example, wxPython lets you
>> import just one symbol, and lots more appear magically.  It's no big
>> deal, they have code structured one way, but the interface is very
>> different.  Catch is that code completion frequently gets fooled by these.
>>
>> I'd point out that if you do walk the dictionaries at run time, you'll
>> get different results when you do it with nothing running than if you do
>> a strictly static analysis.  So some things might only show up if you've
>> stepped into the function with the magic going on.
>>
>> Simplest example I can come up with of something a static analysis won't
>> spot:   An instance object    obj   may have some number of attributes
>> assigned the the __init__() method.  But it could also have new fields
>> added by anyone with a referent into it.
>>
>> There is a Python parser in module ast.  Perhaps that'd be some help.  
>> I've not used it, so can't give you any specifics.
>>
>> DaveA
>>     
>
>
> I think it might be possible for me to figure out how to do
> AutoCompletion using the symtable object. But I am having difficulty
> making sense of it.
>
> In my tests, I was use the following Python code:
>
> [code]
> import sys
> x=s
> [/code]
>
> The idea is to get the type of the variable x
>
> To attempt this, I use the following C code (my editor is written in
> C)
>
> symtable* st =y_SymtableString ( "import sys
> \nx=s,"<string>",Py_single_input);
>
> PyObject *name, *value;
> Py_ssize_t pos =;
> while (PyDict_Next(st->st_symbols, &pos, &name, &value))
> {
> ...
> }
>
>
>
> Using this code, I can get information like the name of the symbol
> (x), but I can't figure out how to get the type. If I knew how to get
> this it would solve 99% of my problems :)
>
> Any ideas?
>
>   
There's a type() function as a builtin.  It returns a string showing the 
type of any object you pass it.

I have my doubts about the 99%;   I'd say more like 1%.  Objects have to 
be instantiated to have a type, there's no declarations.  And a function 
has a type, but in order to see the result type through introspection, 
you'd have to run it.  And before you could do that, you'd have to guess 
its parameter types.  And hope it didn't have any serious side effects.

I can't help with the C++ code, since I've never written any that use 
the Python runtime, but perhaps you can experiment with a Python 
version, till you see what is and is-not possible.  Look at the 
following in Python:
import sys

dict = sys.__dict__
for sym in dict:
    print "**", sym, type(dict[sym]), str(dict[sym])


Now, for many of these sym values, sym.__dict__  could similarly be 
analyzed.  So you might write a recursive generator that gave you a list 
of symbols.




From davea at ieee.org  Mon May  4 16:42:42 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 04 May 2009 16:42:42 -0400
Subject: IDE for python 2.6 (auto complete)
In-Reply-To: <f6a09c160905040813w6351f11bo41c0198835f7ece5@mail.gmail.com>
References: <f6a09c160905040813w6351f11bo41c0198835f7ece5@mail.gmail.com>
Message-ID: <49FF5342.8060901@ieee.org>

Soumen banerjee wrote:
> Hello,
> I have just installed and run python 2.6.2 from the sources available
> on the website. I notice that SPE (the editor which i used with python
> 2.5) is not displaying some of the functions new in 2.6 as
> autocomplete options. Is there any IDE with support for autocomplete
> in python 2.6 with all the newer functions included?
>
>   
No idea if it's "all", but Komodo 5.1.1 has been updated for 2.6.




From piet at cs.uu.nl  Mon May  4 16:44:55 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Mon, 04 May 2009 22:44:55 +0200
Subject: Threaded alternatives to smtplib?
References: <mailman.5028.1241416479.11746.python-list@python.org>
	<767h7tF1b8q8gU1@mid.uni-berlin.de>
	<mailman.5032.1241421573.11746.python-list@python.org>
Message-ID: <m2eiv4oawo.fsf@cs.uu.nl>

>>>>> Alex Jurkiewicz <alex at bluebottle.net.au> (AJ) wrote:

>AJ> def threadProcessRecipient():
[snip]
>AJ> if __name__ == '__main__':
>AJ>    THREADS = []
>AJ>    for i in range(CONCURRENCY):
>AJ>        THREADS.append(threading.Thread(target=threadProcessRecipient))
>AJ>    for thread in THREADS:
>AJ>        thread.run()

You should use thread.start(), not thread.run(). When you use run(), it
will be sequential execution, as you experience. With start() you get
concurrency
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From davea at ieee.org  Mon May  4 16:47:18 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 04 May 2009 16:47:18 -0400
Subject: How to walk up parent directories?
In-Reply-To: <ZoELl.21595$as4.10585@nlpi069.nbdc.sbc.com>
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>	<87ocu9k6c4.fsf@benfinney.id.au>
	<ZoELl.21595$as4.10585@nlpi069.nbdc.sbc.com>
Message-ID: <49FF5456.9050808@ieee.org>



Matthew Wilson wrote:
> On Sun 03 May 2009 09:24:59 PM EDT, Ben Finney wrote:
>   
>> Not every simple function belongs in the standard library :-)
>>     
>
> Thanks for the help with this!  Maybe I'm overestimating how often
> people need this walkup function.
>
> Matt
>
>   
Look at os.path.normpath(os.path.join( name, ".."))




From norseman at hughes.net  Mon May  4 16:54:26 2009
From: norseman at hughes.net (norseman)
Date: Mon, 04 May 2009 13:54:26 -0700
Subject: change some lines from a read file
In-Reply-To: <49FF4ADB.5020101@bluewin.ch>
References: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
	<49FF4ADB.5020101@bluewin.ch>
Message-ID: <49FF5602.4060702@hughes.net>

Anthra Norell wrote:
> utab wrote:
>> Dear all,
>>
>> I have to change some lines from a template file, which is rather long
>> to paste here, but I would like to make some parts of some lines
>> optional with my command line arguments but I could not see this
>> directly, I can count the line numbers and decide on this basis to
>> decide the lines to be configured to my will.
>>
>> More specifically, say, I have a that file includes
>>
>> this is an example python file to play around
>> .
>> .
>> .
>> some lines
>> .
>> .
>> .
>> . -> an option line for example.
>> .
>> .
>> .
>> -> another option line so on.
>>
>> and execute the script
>> ./myScript option1 option2
>>
>> so that the options at correct locations will be written.
>>
>> Any other options for this simple job that i can improve my Python a
>> bit as well.
>>
>> Best,
>> Umut
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>   
> Your description is not explicit enough to convey your intention. If 
> your template file is too long to post, post a short representative 
> section, an input data sample and a hand-edited sample of the output 
> data you want to generate. You will get more and better advice. .
> 
> Frederic
> 
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 

===================================================

Assuming the total number of changes is not large,

put OPTION1 where you want it to go in the text
put OPTION2  (same)

import sys

if len(sys.argv) >1:
   OPTION1 = sys.argv[1]
else:
   OPTION1 = "some default stuff"

similar for OPTION2
if len(sys.argv) >2:
   like above
and any others

print section1+OPTION1+section2+OPTION2....

                or
           just using the line count  (in place of "print sect..")
line_number= 0
for i in template:
   if line_number matches line number to place Opt1
     print OPTION1
   elif line_number matches v2
     print OPTION2
and so forth
   else:
     print i   (line from template NOT being changed)
   line_number += Line_number

you can group line number and replacement on command line
runprogram (43,"use this instead") (56,....
and parse inside program before opening template

one thing to watch out for:
    for i in file...  often returns just one character at a time, 
meaning you will have to track EOL's yourself  OR
import the readline and use it to stand a better chance of getting what 
you expect from a read file function.


Today: 20090504
Logic outline, No particular version

HTH



From norseman at hughes.net  Mon May  4 16:54:46 2009
From: norseman at hughes.net (norseman)
Date: Mon, 04 May 2009 13:54:46 -0700
Subject: change some lines from a read file
In-Reply-To: <49FF4ADB.5020101@bluewin.ch>
References: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
	<49FF4ADB.5020101@bluewin.ch>
Message-ID: <49FF5616.9070909@hughes.net>

Anthra Norell wrote:
> utab wrote:
>> Dear all,
>>
>> I have to change some lines from a template file, which is rather long
>> to paste here, but I would like to make some parts of some lines
>> optional with my command line arguments but I could not see this
>> directly, I can count the line numbers and decide on this basis to
>> decide the lines to be configured to my will.
>>
>> More specifically, say, I have a that file includes
>>
>> this is an example python file to play around
>> .
>> .
>> .
>> some lines
>> .
>> .
>> .
>> . -> an option line for example.
>> .
>> .
>> .
>> -> another option line so on.
>>
>> and execute the script
>> ./myScript option1 option2
>>
>> so that the options at correct locations will be written.
>>
>> Any other options for this simple job that i can improve my Python a
>> bit as well.
>>
>> Best,
>> Umut
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>   
> Your description is not explicit enough to convey your intention. If 
> your template file is too long to post, post a short representative 
> section, an input data sample and a hand-edited sample of the output 
> data you want to generate. You will get more and better advice. .
> 
> Frederic
> 
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 

===================================================

Assuming the total number of changes is not large,

put OPTION1 where you want it to go in the text
put OPTION2  (same)

import sys

if len(sys.argv) >1:
   OPTION1 = sys.argv[1]
else:
   OPTION1 = "some default stuff"

similar for OPTION2
if len(sys.argv) >2:
   like above
and any others

print section1+OPTION1+section2+OPTION2....

                or
           just using the line count  (in place of "print sect..")
line_number= 0
for i in template:
   if line_number matches line number to place Opt1
     print OPTION1
   elif line_number matches v2
     print OPTION2
and so forth
   else:
     print i   (line from template NOT being changed)
   line_number += Line_number

you can group line number and replacement on command line
runprogram (43,"use this instead") (56,....
and parse inside program before opening template

one thing to watch out for:
    for i in file...  often returns just one character at a time, 
meaning you will have to track EOL's yourself  OR
import the readline and use it to stand a better chance of getting what 
you expect from a read file function.


Today: 20090504
Logic outline, No particular version

HTH

Steve


From clp2 at rebertia.com  Mon May  4 16:58:04 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 4 May 2009 13:58:04 -0700
Subject: Self function
In-Reply-To: <8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
Message-ID: <50697b2c0905041358i5ff7e3c4nf304174631c5f611@mail.gmail.com>

On Mon, May 4, 2009 at 1:25 PM,  <bearophileHUGS at lycos.com> wrote:
> Aahz:
>> When have you ever had a binary tree a thousand levels deep?
>
> Yesterday.
>
>
>>Consider how big 2**1000 is...<
>
> You are thinking just about complete binary trees.
> But consider that a topology like a single linked list (every node has
> 1 child, and they are chained) is a true binary tree still.

And who in their right mind would not use a *self-balancing* binary
tree in that situation?

Cheers,
Chris
-- 
http://blog.rebertia.com


From piet at cs.uu.nl  Mon May  4 17:01:12 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Mon, 04 May 2009 23:01:12 +0200
Subject: Is there is any way to send messages to chunk of emails ID's
	concurrently using smptlib
References: <17ea2ba6-3f5d-4e7e-b05b-6d91dfbc5b36@k19g2000prh.googlegroups.com>
Message-ID: <m27i0woa5j.fsf@cs.uu.nl>

>>>>> gganesh <ganesh.gbg at gmail.com> (g) wrote:

>g> Hi friends,
>g> I suppose sendmail() can send mails one by one ,how to send mails
>g> concurrently ,
>g> It would be very grateful,if someone could point out a solution.

There is a discussion about this in the thread `Threaded alternatives to
smtplib?' 
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From davea at ieee.org  Mon May  4 17:10:11 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 04 May 2009 17:10:11 -0400
Subject: SYSTEM and USER environment (was Your confirmation is required
	to join the Python-list mailing list)
In-Reply-To: <7be934440905040914t699a0e70s62671f299961ac6@mail.gmail.com>
References: <mailman.0.1241452418.13411.python-list@python.org>
	<7be934440905040914t699a0e70s62671f299961ac6@mail.gmail.com>
Message-ID: <49FF59B3.3030300@ieee.org>

Allan Yuan wrote:
> Hi,
> I just wanna know how to set SYSTEM variables and USER variables of windows,
> but got no way.
>
> Firstly I thought "os.environ + os.system" may work well, but found no way
> to let "os.environ" run to retrive USER variables.
>
> Then I tried win32api, finding the GetEnvironmentVariables() mixing SYSTEM
> and USER variables up, and SetEnvironmentVariables() failing to add
> variables.
>
> Could you help me, please?
> Thanks a lot.
>
>   
First, you need to put a meaningful subject line on a query to the 
list.  Hopefully you also did the confirmation, so that you'll actually 
be getting the list emails.

Next, your problem.  SYSTEM and USER variables are a uniquely Windows 
concept, and as far as I know, have no direct counterpart in Python.  
These are really just names used in the Control Panel applet to refer to 
two sections of the registry which are used to define which environment 
variables a task will start with, if the task is started directly from 
Explorer.  Tasks that are started by other tasks (eg. the command line) 
get environment variables as defined by the parent.

So, there are at least three obvious ways a process gets started.  One 
is by explorer, in which case it gets the environment described above.  
Two is by a DOS box, in which case it gets the environment variables 
according to the rules of the CMD shell.  And third is from an arbitrary 
3rd party process, in which case it's up to that developer.

So, which are you trying to change?  I'm suspecting you're interested in 
the Explorer version, for example that launches a program from a 
shortcut on the desktop, or via an association with a particular file 
extension.  i don't know which registry variables are involved, but 
there are two registry keys,
     Try:    hklm/SYSTEm/CurrentControlSet/Control/Session 
Manager/Environment    for the SYSTEM environment variables
               and hkcu/Environment     for the USER environment variables

Experiment first with REGEDIT, then when you get the behavior you want,  
look up module _winreg  (or winreg in Python 3.0) to do it 
programmatically.  Notice that existing DOS boxes won't see these new 
variables, only things launched by Explorer or the equivalent.

It's also possible you just want to set environment variables for a 
particular DOS box session.  In that case, use a .BAT or .CMD file, in 
which a SET statement tells the shell what values to use next time it 
launches.




From arnodel at googlemail.com  Mon May  4 17:31:29 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 04 May 2009 22:31:29 +0100
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
Message-ID: <m2fxfkr1vy.fsf@googlemail.com>

bearophileHUGS at lycos.com writes:

> Aahz:
>> When have you ever had a binary tree a thousand levels deep?
>
> Yesterday.
>
>
>>Consider how big 2**1000 is...<
>
> You are thinking just about complete binary trees.
> But consider that a topology like a single linked list (every node has
> 1 child, and they are chained) is a true binary tree still.

In that case the following would not grow the stack, given tail-call
optimization:

def visit(node):
    print 'visiting', node
    if node.right is None:
        return visit(node.left)
    if node.left is not None:
        visit(node.left)
    return visit(node.right)

-- 
Arnaud


From rhodri at wildebst.demon.co.uk  Mon May  4 17:54:08 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 04 May 2009 22:54:08 +0100
Subject: if statement, with function inside it: if (t = Test()) == True:
In-Reply-To: <slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>
References: <d14b67f4-6b5e-4748-85f6-6d4f69353fa2@w40g2000yqd.googlegroups.com>
	<020183f4$0$20619$c3e8da3@news.astraweb.com>
	<slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>
Message-ID: <op.utfdsicva8ncjz@gnudebst>

On Mon, 04 May 2009 15:25:44 +0100, Antoon Pardon  
<apardon at forel.vub.ac.be> wrote:

> On 2009-04-24, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au>  
> wrote:
>> On Fri, 24 Apr 2009 03:00:26 -0700, GC-Martijn wrote:
>>
>>> Hello,
>>>
>>> I'm trying to do a if statement with a function inside it. I want to  
>>> use
>>> that variable inside that if loop , without defining it.
>>>
>>> def Test():
>>>     return 'Vla'
>>>
>>> I searching something like this:
>>>
>>> if (t = Test()) == 'Vla':
>>>     print t # Vla
>>>
>>> or
>>>
>>> if (t = Test()):
>>>     print t # Vla
>>
>> Fortunately, there is no way of doing that with Python. This is one
>> source of hard-to-debug bugs that Python doesn't have.
>
> I think this is an unfortunate consequence of choosing '=' for the
> assignment. They could have chosen an other token to indicate an
> assignment one that would have made the difference between an
> assignment and a comparison more visually different and thus
> bugs by using one while needing the other less hard to track
> down.

What token could be used and still be meaningful, though?  Algol
used ":=", which has most of the same problems as "=" (more, in my
opinion, since it fools the eye more easily if you're scanning
printed code quickly).  Easily constructed arrows like "<=" or
"<-" collide with different comparators.  About all that's left
that even vaguely implies assignment is "~", and it's no better.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gagsl-py2 at yahoo.com.ar  Mon May  4 17:54:22 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 04 May 2009 18:54:22 -0300
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
	<mailman.5041.1241442097.11746.python-list@python.org>
	<c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com>
	<gtmsf0$se7$1@amma.irisa.fr>
	<b1f47eb5-22a6-491c-b6db-bda94c934b23@l28g2000vba.googlegroups.com>
Message-ID: <op.utfdswb4x6zn5v@gabriel.sleipnir-bsas>

En Mon, 04 May 2009 15:12:41 -0300, mzdude <jsanga at cox.net> escribi?:

> substring isn't limited to 0..255
>>>> substring = "\0x%d\0x%d" % (257,257)
>>>> 'acaccgac'.replace("ac", substring)
> '\x00x257\x00x257\x00x257\x00x257cg\x00x257\x00x257'

This isn't what you think it is. Look carefully:

py> substring = "\0x%d\0x%d" % (257,257)
py> len(substring)
10
py> list(substring)
['\x00', 'x', '2', '5', '7', '\x00', 'x', '2', '5', '7']

-- 
Gabriel Genellina



From tjreedy at udel.edu  Mon May  4 17:54:50 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 04 May 2009 17:54:50 -0400
Subject: Self function
In-Reply-To: <e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
Message-ID: <gtno79$g9h$1@ger.gmane.org>

bearophileHUGS at lycos.com wrote:

> Another possible syntax:
> 
> def fact(n):
>     return 1 if n <= 1 else n * return(n - 1)
> 
> But I guess most people don't see this problem as important&common
> enough to justify changing the language.

Actually, I would like a way to refer to the current function from 
inside a function.  but I would like support in the language, so that 
the compiler patched the code after the function object is created to 
directly refer to the function object (or can the code object call the 
code object?) without any name lookup at all. [An possible objection to 
doing this is that the code might no longer be valid if used to make 
another function object, but I think this is so rare at to hardly worry 
about.] Your initial post seemed to be about a hackish work around that 
looked to me to make as much trouble as it saves.  So I did not respond.



From Robert.T.Lynch at seagate.com  Mon May  4 18:02:13 2009
From: Robert.T.Lynch at seagate.com (Robert.T.Lynch at seagate.com)
Date: Mon, 4 May 2009 15:02:13 -0700
Subject: exit a program gracefully
Message-ID: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>

In a python program I ask if the user wants to continue.  If they answer 
'no', what options do I have to halt execution?  I can put the rest of the 
code inside an "if bContinue:" block, but that seems awkward.  I have 
looked at raising an exception, and perhaps this is the preferred method, 
but it seems daunting to my non-OOP eyes.  Thanks -- Rob
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From tjreedy at udel.edu  Mon May  4 18:02:59 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 04 May 2009 18:02:59 -0400
Subject: find sublist inside list
In-Reply-To: <gtmlsk$q51$1@amma.irisa.fr>
References: <gtmlsk$q51$1@amma.irisa.fr>
Message-ID: <gtnomi$hlu$1@ger.gmane.org>

Matthias Gall? wrote:
> Hi.
> 
> My problem is to replace all occurrences of a sublist with a new element.
> 
> Example:
> Given ['a','c','a','c','c','g','a','c'] I want to replace all 
> occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).
> 
> If I do this with string ('acaccgac') I have the advantage of all the 
> 'find' functions, but perfomance is bad and some extra care must be 
> taken if one element consist of more then one character (case of 11 for 
> example)
> 
> So I really would like to work with lists straightforward, but I could 
> not found anything to search a sublist inside a list.
> Any propositions for a simple solution?

For a mutable homogenous array, consider the array module.
Any algorithm that applies to a sequence of chars can be adjusted to 
other sequences.  For the above case, remember than you can easily 
filter None out of a sequence.  IE, replace 'a','c' with 6, None and 
then filter when done.



From clp2 at rebertia.com  Mon May  4 18:14:53 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 4 May 2009 15:14:53 -0700
Subject: exit a program gracefully
In-Reply-To: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
References: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
Message-ID: <50697b2c0905041514t22ac9436td0dbe51e0f22dcfa@mail.gmail.com>

On Mon, May 4, 2009 at 3:02 PM,  <Robert.T.Lynch at seagate.com> wrote:
>
> In a python program I ask if the user wants to continue. ?If they answer
> 'no', what options do I have to halt execution? ?I can put the rest of the
> code inside an "if bContinue:" block, but that seems awkward. ?I have looked
> at raising an exception, and perhaps this is the preferred method, but it
> seems daunting to my non-OOP eyes. ?Thanks -- Rob

There's the C-like:
from sys import exit
exit(return_code)

Or if you prefer exceptions, the standard way is:
raise SystemExit

Cheers,
Chris
-- 
http://blog.rebertia.com


From google at mrabarnett.plus.com  Mon May  4 18:16:28 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 23:16:28 +0100
Subject: if statement, with function inside it: if (t = Test()) == True:
In-Reply-To: <op.utfdsicva8ncjz@gnudebst>
References: <d14b67f4-6b5e-4748-85f6-6d4f69353fa2@w40g2000yqd.googlegroups.com>	<020183f4$0$20619$c3e8da3@news.astraweb.com>	<slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>
	<op.utfdsicva8ncjz@gnudebst>
Message-ID: <49FF693C.9000506@mrabarnett.plus.com>

Rhodri James wrote:
> On Mon, 04 May 2009 15:25:44 +0100, Antoon Pardon 
> <apardon at forel.vub.ac.be> wrote:
> 
>> On 2009-04-24, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> 
>> wrote:
>>> On Fri, 24 Apr 2009 03:00:26 -0700, GC-Martijn wrote:
>>>
>>>> Hello,
>>>>
>>>> I'm trying to do a if statement with a function inside it. I want to 
>>>> use
>>>> that variable inside that if loop , without defining it.
>>>>
>>>> def Test():
>>>>     return 'Vla'
>>>>
>>>> I searching something like this:
>>>>
>>>> if (t = Test()) == 'Vla':
>>>>     print t # Vla
>>>>
>>>> or
>>>>
>>>> if (t = Test()):
>>>>     print t # Vla
>>>
>>> Fortunately, there is no way of doing that with Python. This is one
>>> source of hard-to-debug bugs that Python doesn't have.
>>
>> I think this is an unfortunate consequence of choosing '=' for the
>> assignment. They could have chosen an other token to indicate an
>> assignment one that would have made the difference between an
>> assignment and a comparison more visually different and thus
>> bugs by using one while needing the other less hard to track
>> down.
> 
> What token could be used and still be meaningful, though?  Algol
> used ":=", which has most of the same problems as "=" (more, in my
> opinion, since it fools the eye more easily if you're scanning
> printed code quickly).  Easily constructed arrows like "<=" or
> "<-" collide with different comparators.  About all that's left
> that even vaguely implies assignment is "~", and it's no better.
> 
If you're not limited to ASCII then there's '?' (U+2190, 'LEFTWARDS
ARROW'). It's a little too late now, though.


From ryan at rfk.id.au  Mon May  4 18:17:38 2009
From: ryan at rfk.id.au (Ryan Kelly)
Date: Tue, 05 May 2009 08:17:38 +1000
Subject: [ANN] regobj - Pythonic object-based access to the Windows
	Registry
In-Reply-To: <49FF2156.6010909@g.nevcal.com>
References: <1241361308.4359.9.camel@mango>  <49FF2156.6010909@g.nevcal.com>
Message-ID: <1241475458.4427.14.camel@mango>


> >   I've just released the results of a nice Sunday's coding, inspired by
> > one too many turns at futzing around with the _winreg module.  The
> > "regobj" module brings a convenient and clean object-based API for
> > accessing the Windows Registry.
>
> Sounds very interesting, Ryan.  Just a couple questions about the 
> dictionary interface.

Thanks for you interest and suggestions, a couple of quick points below.

> I could see how you could map  numbers to DWORD, 2.x str/3.x bytes to 
> binary, and 2.x unicode/3.x str to REG_SZ.  But you don't document such 
> a translation, so it is unclear exactly what you actually do.  This 
> would be somewhat weird in 2.x, though, where str commonly would want to 
> map to String rather than Binary.
> 
> It seems almost necessary to add an explanation of whatever mapping is 
> presently done, to have complete documentation.

I guess I just ran out of steam on the documentation front :-)

Currently it maps integers to DWORD and anything else to REG_SZ.  The
idea of having a distinct Value class is to allow a more nuanced mapping
to be developed, but I haven't got down to the details of that yet - my
current application only requires REG_SZ.

> Thinking more, I wonder if it is possible to create objects of type 
> Value to put in the dictionary to allow specification of multistring and 
> expandablestring Registry types, but then the dictionary name would have 
> to be redundant with the name attribute in the Value object.  Maybe a 
> nameless value type could be invented, with just type and data attributes?

It certainly is, using syntax like:

  HKCU.foo.bar["key"] = Value("%SYSTEMROOT%/mydir",type=REG_EXPAND_SZ)}

Putting a nameless Value() instance in the initialisation dictionary
should also work (but as you note, there's no documentation or tests for
this yet...)


  Cheers,

     Ryan



-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details

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From google at mrabarnett.plus.com  Mon May  4 18:21:06 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 23:21:06 +0100
Subject: exit a program gracefully
In-Reply-To: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
References: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
Message-ID: <49FF6A52.5070502@mrabarnett.plus.com>

Robert.T.Lynch at seagate.com wrote:
> 
> In a python program I ask if the user wants to continue.  If they answer 
> 'no', what options do I have to halt execution?  I can put the rest of 
> the code inside an "if bContinue:" block, but that seems awkward.  I 
> have looked at raising an exception, and perhaps this is the preferred 
> method, but it seems daunting to my non-OOP eyes.  Thanks -- Rob
> 
What is the overall structure of the program? What happens if the user
wants to continue? If you're in a loop then you can just use 'break' to
leave the loop.


From Scott.Daniels at Acm.Org  Mon May  4 18:21:18 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 04 May 2009 15:21:18 -0700
Subject: AutoComplete in C++ Editor for Python
In-Reply-To: <10fef506-2c39-418c-82e8-5c0c05a19e5c@s31g2000vbp.googlegroups.com>
References: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>
	<mailman.5011.1241378077.11746.python-list@python.org>
	<10fef506-2c39-418c-82e8-5c0c05a19e5c@s31g2000vbp.googlegroups.com>
Message-ID: <AIidnaDg3e-p9GLUnZ2dnUVZ_h6dnZ2d@pdx.net>

flamz3d at gmail.com wrote:
> ... Using this code, I can get information like the name of the symbol
> (x), but I can't figure out how to get the type. If I knew how to get
> this it would solve 99% of my problems :)

If Python were statically typed, you might be correct.
A _value_ in python has a type, not a variable.  so, you can do:
    some_list = []
    for a in None, True, 1, 1.0, 3.1j, 'text', u'text':
        some_list.append(a)
    print some_list
and you will see something like:
[None, True, 1, 1.0, 3.1000000000000001j, 'text', u'text']
That is, a has the type of its current value.
any kind of object can be stored in any variable.

--Scott David Daniels
Scott.Daniels at Acm.Org


From seanm.py at gmail.com  Mon May  4 18:22:56 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Mon, 4 May 2009 15:22:56 -0700 (PDT)
Subject: Most Basic Question Ever - please help
References: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
	<7c328de7-ed20-450c-819f-7689e73f6a6c@g19g2000vbi.googlegroups.com>
Message-ID: <cb1c7778-7965-4ddc-a929-290aac48fec5@t10g2000vbg.googlegroups.com>

On May 3, 12:22?am, CM <cmpyt... at gmail.com> wrote:
> On May 2, 4:36?pm, seanm... at gmail.com wrote:
>
>
>
> > I am going to try posting here again with more detail to see if I can
> > finally get my first program to work.
>
> > I am working on a MacBook Pro with OS X 10.4.11. I opened a new window
> > in IDLE to create a file. The file had only one line of code and was
> > saved as module1.py. I saved it to Macintosh HD. The one line of code
> > in the file is copied below:
>
> > print 'Hello module world!'
>
> > I closed the file and tried to run it in IDLE and Terminal, but I have
> > had no success. I'll paste my commands and the error messages below
> > (for IDLE, then Terminal). Any help would be very much appreciated. I
> > feel like the marathon just started and I've fallen flat on my face.
> > Thanks.
>
> > IDLE 2.6.2>>> python module1.py
>
> > SyntaxError: invalid syntax
>
> > sean-m-computer:~ seanm$ python
> > Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> > [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> > Type "help", "copyright", "credits" or "license" for more information.>>> python module1.py
>
> > ? File "<stdin>", line 1
> > ? ? python module1.py
> > ? ? ? ? ? ? ? ? ?^
> > SyntaxError: invalid syntax
>
> Sean, also, keep in mind you can use IDLE to run
> your scripts. ?After you have saved a script/program,
> there is an option for Run in the menu, and then under
> that, Run Module. ?The output of the script will be
> sent to IDLE window indicated as the Python shell.
> You can also just test code directly from within
> that shell, though for multi-line programs, it is
> easier within the composing window.
>
> I suggest you sign up for the Python tutor list:http://mail.python.org/mailman/listinfo/tutor
>
> And you can search through their big archive of
> questions and answers here:http://www.nabble.com/Python---tutor-f2981.html
>
> The tutors there are great and super-helpful, and
> will field any level of question but are particularly
> good for absolute beginners.
>
> Here is a tutorial on using IDLE:http://hkn.eecs.berkeley.edu/~dyoo/python/idle_intro/index.html
>
> And here is a very good general programming tutorial online
> book, focusing on Python:http://www.freenetpages.co.uk/hp/alan.gauld/
>
> Good luck!
> Che

Thanks Che! The explaination and links are much appreciated. -Sean


From Scott.Daniels at Acm.Org  Mon May  4 18:31:01 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 04 May 2009 15:31:01 -0700
Subject: Self function
In-Reply-To: <m2fxfkr1vy.fsf@googlemail.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<m2fxfkr1vy.fsf@googlemail.com>
Message-ID: <37idnXafVJvm9mLUnZ2dnUVZ_v-dnZ2d@pdx.net>

Arnaud Delobelle wrote:
> In that case the following would not grow the stack, given tail-call
> optimization:
> 
> def visit(node):
>     print 'visiting', node
>     if node.right is None:
>         return visit(node.left)
>     if node.left is not None:
>         visit(node.left)
>     return visit(node.right)
> 
Or (without TCO):
     def visit(node):
         while node is not None:
             print 'visiting', node
             if node.right is None:
                 node = node.left
             else:
                 if node.left is not None:
                     visit(node.left)
                 node = node.right

Not so hard, really.

--Scott David Daniels
Scott.Daniels at Acm.Org


From gagsl-py2 at yahoo.com.ar  Mon May  4 18:33:51 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 04 May 2009 19:33:51 -0300
Subject: exit a program gracefully
References: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
	<50697b2c0905041514t22ac9436td0dbe51e0f22dcfa@mail.gmail.com>
Message-ID: <op.utffmpr2x6zn5v@gabriel.sleipnir-bsas>

En Mon, 04 May 2009 19:14:53 -0300, Chris Rebert escribi?:
> On Mon, May 4, 2009 at 3:02 PM,  <Robert.T.Lynch at seagate.com> wrote:

>> In a python program I ask if the user wants to continue. ?If they answer
>> 'no', what options do I have to halt execution? ?I can put the rest of  
>> the
>> code inside an "if bContinue:" block, but that seems awkward. ?I have  
>> looked
>> at raising an exception, and perhaps this is the preferred method, but  
>> it
>> seems daunting to my non-OOP eyes. ?Thanks -- Rob
>
> There's the C-like:
> from sys import exit
> exit(return_code)
>
> Or if you prefer exceptions, the standard way is:
> raise SystemExit

I prefer to put the code inside a function, and just `return` earlier.
Having a sys.exit() in the middle of a function means that it's not  
reusable; I usually have a single exit() at the end.


def do_work():
   do some work
   ask the user
   if not continue:
     return 0
   do more work
   return 0

if __name__=='__main__':
   try: sts = do_work()
   except: sts = 1, log exception
   sys.exit(sts)

-- 
Gabriel Genellina



From tjreedy at udel.edu  Mon May  4 18:36:55 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 04 May 2009 18:36:55 -0400
Subject: if statement, with function inside it: if (t = Test()) == True:
In-Reply-To: <slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>
References: <d14b67f4-6b5e-4748-85f6-6d4f69353fa2@w40g2000yqd.googlegroups.com>	<020183f4$0$20619$c3e8da3@news.astraweb.com>
	<slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>
Message-ID: <gtnqm6$ms7$1@ger.gmane.org>

Antoon Pardon wrote:
> On 2009-04-24, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:
>> On Fri, 24 Apr 2009 03:00:26 -0700, GC-Martijn wrote:
>>
>>> Hello,
>>>
>>> I'm trying to do a if statement with a function inside it. I want to use
>>> that variable inside that if loop , without defining it.
>>>
>>> def Test():
>>>     return 'Vla'
>>>
>>> I searching something like this:
>>>
>>> if (t = Test()) == 'Vla':
>>>     print t # Vla
>>>
>>> or
>>>
>>> if (t = Test()):
>>>     print t # Vla
>> Fortunately, there is no way of doing that with Python. 

There is a way to do something close.

def x(v):
     x.val = v
     return v

if x(3)==3:
     print('x.val is ', x.val)
# prints
x.val is  3

In OP's case, condition is "x(Test()) == 'Vla'"

>> This is one  source of hard-to-debug bugs that Python doesn't have.
> 
> I think this is an unfortunate consequence of choosing '=' for the
> assignment.

Actually, is is a consequence of making assignment a statement rather 
than an expression.  And that is because if assignment were an 
expression, the new name would have to be quoted.  Or there would have 
to be a special exception to the normal expression evaulation rule.  In 
other words, the problems one sees in a pure expression language.  Note 
that C, for instance, which has such a special exception, does not, last 
I knew, allow a,b = 1,2.

The solution for this use case is to encapsulate the binding within a 
function.  The above is one possible example.  One could use a pocket 
class instead of a pocket function.  Or

def set_echo(name, val):
   globals()[name] = val
   return val

if set_echo('t', Test()) == 'Vla': print t ...

Terry Jan Reedy




From Scott.Daniels at Acm.Org  Mon May  4 18:49:46 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 04 May 2009 15:49:46 -0700
Subject: if statement, with function inside it: if (t = Test()) == True:
In-Reply-To: <mailman.5076.1241475375.11746.python-list@python.org>
References: <d14b67f4-6b5e-4748-85f6-6d4f69353fa2@w40g2000yqd.googlegroups.com>	<020183f4$0$20619$c3e8da3@news.astraweb.com>	<slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>	<op.utfdsicva8ncjz@gnudebst>
	<mailman.5076.1241475375.11746.python-list@python.org>
Message-ID: <Vr2dnfaTIdhC8mLUnZ2dnUVZ_v6dnZ2d@pdx.net>

MRAB wrote:
> If you're not limited to ASCII then there's '?' (U+2190, 'LEFTWARDS
> ARROW'). It's a little too late now, though.
Well, if you are old enough, that was the ASCII graphic for the
character now printed as '_' (ASCII), and SAIL used it for assignment
statements, causing much consternation when our source code displayed
funny on new-fangled terminals.  So, just an unfortunate setting on
the time machine is the basic flaw.

--Scott David Daniels
@Acm.Org


From pavlovevidence at gmail.com  Mon May  4 18:51:15 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 4 May 2009 15:51:15 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
Message-ID: <a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>

On May 4, 1:25?pm, bearophileH... at lycos.com wrote:
> Aahz:
>
> > When have you ever had a binary tree a thousand levels deep?
>
> Yesterday.
>
> >Consider how big 2**1000 is...<
>
> You are thinking just about complete binary trees.
> But consider that a topology like a single linked list (every node has
> 1 child, and they are chained) is a true binary tree still.

1. Singly-linked lists can and should be handled with iteration.  All
recursion does it make what you're doing a lot less readable for
almost all programmers.

2. You should be using a Python list anyway.


Carl Banks


From ben+python at benfinney.id.au  Mon May  4 18:55:31 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Tue, 05 May 2009 08:55:31 +1000
Subject: IDE for python 2.6 (auto complete)
References: <mailman.5053.1241450027.11746.python-list@python.org>
Message-ID: <87zldsiil8.fsf@benfinney.id.au>

Soumen banerjee <soumen08 at gmail.com> writes:

> Is there any IDE with support for autocomplete in python 2.6 with all
> the newer functions included?

Emacs, with the right library, is an excellent Python IDE with
auto-completion and many other features
<URL:http://tellarite.net/2008/05/09/emacs-as-a-powerful-python-ide/>.

-- 
 \           ?People are very open-minded about new things, as long as |
  `\         they're exactly like the old ones.? ?Charles F. Kettering |
_o__)                                                                  |
Ben Finney


From bearophileHUGS at lycos.com  Mon May  4 19:06:28 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 16:06:28 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
Message-ID: <f17fd77e-43b9-4d97-ba29-4790def4826d@z7g2000vbh.googlegroups.com>

Carl Banks:

>1. Singly-linked lists can and should be handled with iteration.<

I was talking about a binary tree with list-like topology, of course.


>All recursion does it make what you're doing a lot less readable for almost all programmers.<

I can't agree. If the data structure is recursive (like a tree, or
even sometimes graphs, etc) a recursive algorithm is shorter, more
readable and more natural.

An example, a postorder recursive visit:

def postorder_scan(root):
    if root is not None:
        if root.left is not None:
            for n in postorder_scan(root.left):
                yield n
        if root.right is not None:
            for n in postorder_scan(root.right):
                yield n
        yield root

Try to write that in an iterative way, not adding any new field to the
nodes, and you will see.
And even if you add a "visited" new boolean field to nodes, the
resulting code isn't as nice as the recursive one yet.


> 2. You should be using a Python list anyway.

I should use D when I have to use such algorithms, I know.

Bye,
bearophile


From amber.of.luxor at gmail.com  Mon May  4 19:30:32 2009
From: amber.of.luxor at gmail.com (Amber)
Date: Mon, 4 May 2009 17:30:32 -0600
Subject: Database help needed
Message-ID: <da8216770905041630v2d9dc1a0xdaacd4e1738b1ff9@mail.gmail.com>

My PHB is insane.

Today he drops 50,000 databases in MS Access format on my desk, and tells me
that by Friday I need to:
* Remove all of the "junk content" in the record fields;
* Remove all records with blank fields in them;
* Correct all fields in which the markup is "wrong";
* Correct all fields in which the data is "wrong";
* Ensure that all database include some specific tables;
** Add appropriate content to the records in the "new" tables;

And finally, said databases are to be in:

* MS Access 97 format;
* MS Access 2000 format;
* MS Access 2003 format;
** Is there any documentation anywhere on what the differences between those
is?   Won't a database created for Access 97 be openable in MS Access 2003?
* SQLite format;
* MySQL format;
* PDB format, for use on his PalmPilot;
* Commas separated values;
* dBase 3;
* Excell spreadsheets;
* ODF spreadsheets;

I'm a programming novice, but I think that I can write a script that reads
the MSAccess databases, and cleans up the content in the individual fields
of the database.
What I need is:
* A pointer to good. current, downloadable documentation on creating, and
editing databases using Python;
** Good current books on python and databases will also be useful;
* Pointers to material that describe how to create MS Access databases using
Python, on Linux;
* Pointers to material that describe how to create, and edit SQL CE 2.0
databases in Python, on Linux.  I'm assuming that this is possible, but
since that database engine is available for Windows Mobile only --- at least
according to the Google search I did --- I have some doubts;

I need stuff I can download.   I'll be burning it to a DVD, and taking that
to work.   No internet access at work.  The PHB considers that to be a time
waster, and an expensive luxury that can not be justified in the current
economic climate.

Amber
-- 
Wind under Thy Wings
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From pavlovevidence at gmail.com  Mon May  4 19:33:13 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 4 May 2009 16:33:13 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com> 
	<f17fd77e-43b9-4d97-ba29-4790def4826d@z7g2000vbh.googlegroups.com>
Message-ID: <f6d22d90-b1e1-40f2-8647-834163638ce3@v35g2000pro.googlegroups.com>

On May 4, 4:06?pm, bearophileH... at lycos.com wrote:
> Carl Banks:
>
> >1. Singly-linked lists can and should be handled with iteration.<
>
> I was talking about a binary tree with list-like topology, of course.

"(every node has 1 child, and they are chained)"

That's a singly-linked list, not a tree.  It's a degenerate tree at
best.


> >All recursion does it make what you're doing a lot less readable for almost all programmers.<
>
> I can't agree.

If every child has one node you don't need recursion.


> If the data structure is recursive (like a tree, or
> even sometimes graphs, etc) a recursive algorithm is shorter, more
> readable and more natural.

Because that's a tree, not a linked-list.

Which is germane because Python's recursion limit is the thing you're
complaining about here, and you don't normally hit that limit with
real trees because they rarely go 1000 deep.

Singly-linked lists don't count because you don't need recursion for
them.


[snip strawman example]
> > 2. You should be using a Python list anyway.
>
> I should use D when I have to use such algorithms, I know.

That's another idea.


Carl Banks



From emile at fenx.com  Mon May  4 19:51:10 2009
From: emile at fenx.com (Emile van Sebille)
Date: Mon, 04 May 2009 16:51:10 -0700
Subject: Database help needed
In-Reply-To: <da8216770905041630v2d9dc1a0xdaacd4e1738b1ff9@mail.gmail.com>
References: <da8216770905041630v2d9dc1a0xdaacd4e1738b1ff9@mail.gmail.com>
Message-ID: <gtnuts$v7$1@ger.gmane.org>

On 5/4/2009 4:30 PM Amber said...
> 
> My PHB is insane.
> 
> Today he drops 50,000 databases in MS Access format on my desk, and 
> tells me that by Friday I need to:
> * Remove all of the "junk content" in the record fields;
> * Remove all records with blank fields in them;
> * Correct all fields in which the markup is "wrong";
> * Correct all fields in which the data is "wrong";
> * Ensure that all database include some specific tables;
> ** Add appropriate content to the records in the "new" tables;
> 
> And finally, said databases are to be in:
> 
> * MS Access 97 format;
> * MS Access 2000 format;
> * MS Access 2003 format;
> ** Is there any documentation anywhere on what the differences between 
> those is?   Won't a database created for Access 97 be openable in MS 
> Access 2003?
> * SQLite format;
> * MySQL format;
> * PDB format, for use on his PalmPilot;
> * Commas separated values;
> * dBase 3;
> * Excell spreadsheets;
> * ODF spreadsheets;


It wouldn't surprise me that you couldn't do all this with open office 
using command line options which is where I'd start.  There's also 
python modules available, but I haven't yet gotten into them.  I found 
most of what I needed on groups.google.com though, so not having 
internet access could be trouble -- some of the conversion structures 
and requirements weren't quite so obvious nor documentation easily 
available.

Emile



From debatem1 at gmail.com  Mon May  4 19:53:05 2009
From: debatem1 at gmail.com (CTO)
Date: Mon, 4 May 2009 16:53:05 -0700 (PDT)
Subject: Database help needed
References: <da8216770905041630v2d9dc1a0xdaacd4e1738b1ff9@mail.gmail.com> 
	<mailman.5082.1241480972.11746.python-list@python.org>
Message-ID: <a9ddf183-cc96-4121-8e8a-718331627d2b@s21g2000vbb.googlegroups.com>

On May 4, 7:51?pm, Emile van Sebille <em... at fenx.com> wrote:
> On 5/4/2009 4:30 PM Amber said...
>
>
>
>
>
> > My PHB is insane.
>
> > Today he drops 50,000 databases in MS Access format on my desk, and
> > tells me that by Friday I need to:
> > * Remove all of the "junk content" in the record fields;
> > * Remove all records with blank fields in them;
> > * Correct all fields in which the markup is "wrong";
> > * Correct all fields in which the data is "wrong";
> > * Ensure that all database include some specific tables;
> > ** Add appropriate content to the records in the "new" tables;
>
> > And finally, said databases are to be in:
>
> > * MS Access 97 format;
> > * MS Access 2000 format;
> > * MS Access 2003 format;
> > ** Is there any documentation anywhere on what the differences between
> > those is? ? Won't a database created for Access 97 be openable in MS
> > Access 2003?
> > * SQLite format;
> > * MySQL format;
> > * PDB format, for use on his PalmPilot;
> > * Commas separated values;
> > * dBase 3;
> > * Excell spreadsheets;
> > * ODF spreadsheets;
>
> It wouldn't surprise me that you couldn't do all this with open office
> using command line options which is where I'd start. ?There's also
> python modules available, but I haven't yet gotten into them. ?I found
> most of what I needed on groups.google.com though, so not having
> internet access could be trouble -- some of the conversion structures
> and requirements weren't quite so obvious nor documentation easily
> available.
>
> Emile

I was just about to recommend OO. PyUNO is pretty easy to use, IMHO,
and while I obviously have no idea what your boss wants in specific,
it shouldn't be too bad.

Geremy Condra


From gallium.arsenide at gmail.com  Mon May  4 19:59:15 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Mon, 4 May 2009 16:59:15 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com>
Message-ID: <1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com>

On May 4, 10:01?am, Ross <ross.j... at gmail.com> wrote:
> The "magic numbers" that everyone is wondering about are
> indeed used for spreading out the bye selection and I got
> them by simply calculating a line of best fit when plotting
> several courts: byes ratios.

But that doesn't really help you.  When you do seq[::step], step is
evaluated once and used for the whole extended slice.  So in almost
all cases that you are likely to encounter, step is 2, so you'll get
seq[0], seq[2], seq[4], etc.  Even if step is some other positive
number, seq[0] will always be chosen.

> The "byes = #whatever" in my code calculate the number of
> tuples that need to be placed in the bye_list.

Fine, but that's not the number of byes that you put into bye_list.

> At first glance, the suggestion of adding a simple shift
> at the end of round_robin doesn't seem to work since
> round_robin already shifts everything except for the first
> position already. Please correct me if I'm wrong because
> you might have been suggesting something different.

If you read my post carefully, you would see that you HAVE to do
something about the first player always being stuck in the first
spot.  Either move him around, or select your byes differently.

That said, I've played around with the shuffling a bit, and it does
seem to be pretty tricky to get it to work for the general case where
there is no prior knowledge of how many players and courts you will
have.

I can't shake the feeling that someone good at math will be able to
figure out something elegant; but if left to my own devices, I am
starting to lean toward just generating all the possible matches and
somehow picking from them as needed to fill the courts, trying to keep
the number of matches played by each player as close to equal as
possible, and trying to keep the waiting times approximately equal as
well.

John


From norseman at hughes.net  Mon May  4 20:15:55 2009
From: norseman at hughes.net (norseman)
Date: Mon, 04 May 2009 17:15:55 -0700
Subject: Tkinter, Trouble with Message,Label widget
In-Reply-To: <4f61c431-1c78-4de7-9b82-08eee09ae7d6@s20g2000vbp.googlegroups.com>
References: <mailman.5017.1241392410.11746.python-list@python.org>
	<4f61c431-1c78-4de7-9b82-08eee09ae7d6@s20g2000vbp.googlegroups.com>
Message-ID: <49FF853B.7040404@hughes.net>

Ioannis Lalopoulos wrote:
> I assume that you create the two windows through two different calls
> to Tkinter.Tk() but you cannot enter two mainloops (at least not in a
> normal way).
> 
> If you want a second window use the Toplevel widget.
> 
> Try the following, it does what you want:
> 
> import Tkinter
> 
> root = Tkinter.Tk()
> 
> my_text = Tkinter.StringVar(root)
> 
> another_window = Tkinter.Toplevel()
> 
> entry = Tkinter.Entry(root, textvar=my_text)
> entry.pack()
> 
> label = Tkinter.Label(another_window, textvar=my_text)
> label.pack()
> 
> root.mainloop()
> 
> In the above example, whatever you type in the entry widget in the
> root window gets reflected in the label widget which is inside the
> second window, the one that was created with Tkinter.Toplevel().
> 
> Hope it helps,
> 
> John
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
================================================
Hendrik van Rooyen  mentioned the textvar too.  Thanks Hendrik

John (Ioannis);
         It took me awhile to get your template to work for me.
         People reading this!  THE ABOVE CODE WORKS JUST FINE - AS IS!!!

My needs are slightly different and it took me a bit to get python and I 
on the same track.  I still have reflexes that demand dictionary 
compliance.  Global is supposed to be Global, really, not just sort of.

Once I get past the children I seem to do OK in python.

like:
mVar= '1234'            according to docs, this is a global
p='%6s\n' % mVar        same
...some code to do something
mVar= '4321'            updates a supposed global

                               these two don't think so
print p                 prints from both of these show the 1234,
print '%s' % p[:]       they do not reflect the updated 'global'


 >>>
 >>> mVar= '1234'
 >>> mVar
'1234'
 >>> p= '%s\n' % mVar
 >>> p
'1234\n'
 >>>
 >>> mVar= '4321'
 >>> mVar
'4321'
 >>> print p
1234
 >>> print '%s' % p[:]
1234
 >>>


The definitive on Toplevel was the biggest help. All I have read have 
never clearly stated its purpose. (A non-root root)

per Tkinter help:
"class Toplevel(BaseWidget, Wm)
      Toplevel widget, e.g. for dialogs.
  ...
"
Since I'm not doing dialogs, I quite reading and move on.




John: Thank you again.

Today: 20090504
copy/paste from Python 2.5.2 on Linux Slackware 10.2

Steve
norseman at hughes.net


From aydavis at purdue.edu  Mon May  4 20:45:25 2009
From: aydavis at purdue.edu (Davis, Amelie Y)
Date: Mon, 4 May 2009 20:45:25 -0400
Subject: sorting items in a table problematic because of scientific
	notation
In-Reply-To: <1ff35eef-23bf-4e0a-94e2-73cd3c4e7ba8@y6g2000prf.googlegroups.com>
References: <47B887AC6641DD4DA8949367606399390207BB12@EXCH06.purdue.lcl>
	<mailman.4733.1240965435.11746.python-list@python.org>
	<1ff35eef-23bf-4e0a-94e2-73cd3c4e7ba8@y6g2000prf.googlegroups.com>
Message-ID: <47B887AC6641DD4DA8949367606399390207BF1F@EXCH06.purdue.lcl>

Thank you  _ that solved it. 

?
Am?lie
?
??Please consider the environment before printing this e-mail or any of its attachments (if applicable)
?


-----Original Message-----
From: python-list-bounces+aydavis=purdue.edu at python.org [mailto:python-list-bounces+aydavis=purdue.edu at python.org] On Behalf Of Raymond Hettinger
Sent: Wednesday, April 29, 2009 10:31 AM
To: python-list at python.org
Subject: Re: sorting items in a table problematic because of scientific notation

[John Machin]
> > 'NEAR_DIST'], [('N', 9, 0), ('N', 9, 0), ('F', 19, 11)], [53, 55, '
>
> The data type code for the offending column is "F" which is not in the
> bog-standard dBase III set of C, N, D, and L. The code that you have used merely
> returns unchanged the character string that finds in the data base.
>
>
>
> > 1.05646365517e+005'], [53, 6, ' 9.32599134016e+004'], [53, 0, '
> > 8.97477154418e+004'], [53, 2, ' 8.96449127749e+004'], [53, 1, '
> > 7.88170078501e+004'], [53, 5, ' 8.29281503631e+004'], [53, 4, '

FWIW, I just updated the recipe to handle an F typecode
by casting it to a float.  Hope this helps.


Raymond
--
http://mail.python.org/mailman/listinfo/python-list

From ross.jett at gmail.com  Mon May  4 20:56:57 2009
From: ross.jett at gmail.com (Ross)
Date: Mon, 4 May 2009 17:56:57 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com>
Message-ID: <1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com>

On May 4, 7:59?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 4, 10:01?am, Ross <ross.j... at gmail.com> wrote:
>
> > The "magic numbers" that everyone is wondering about are
> > indeed used for spreading out the bye selection and I got
> > them by simply calculating a line of best fit when plotting
> > several courts: byes ratios.
>
> But that doesn't really help you. ?When you do seq[::step], step is
> evaluated once and used for the whole extended slice. ?So in almost
> all cases that you are likely to encounter, step is 2, so you'll get
> seq[0], seq[2], seq[4], etc. ?Even if step is some other positive
> number, seq[0] will always be chosen.
>
> > The "byes = #whatever" in my code calculate the number of
> > tuples that need to be placed in the bye_list.
>
> Fine, but that's not the number of byes that you put into bye_list.
>
> > At first glance, the suggestion of adding a simple shift
> > at the end of round_robin doesn't seem to work since
> > round_robin already shifts everything except for the first
> > position already. Please correct me if I'm wrong because
> > you might have been suggesting something different.
>
> If you read my post carefully, you would see that you HAVE to do
> something about the first player always being stuck in the first
> spot. ?Either move him around, or select your byes differently.
>
> That said, I've played around with the shuffling a bit, and it does
> seem to be pretty tricky to get it to work for the general case where
> there is no prior knowledge of how many players and courts you will
> have.
>
> I can't shake the feeling that someone good at math will be able to
> figure out something elegant; but if left to my own devices, I am
> starting to lean toward just generating all the possible matches and
> somehow picking from them as needed to fill the courts, trying to keep
> the number of matches played by each player as close to equal as
> possible, and trying to keep the waiting times approximately equal as
> well.
>
> John

"But that doesn't really help you.  When you do seq[::step], step is
evaluated once and used for the whole extended slice.  So in almost
all cases that you are likely to encounter, step is 2, so you'll get
seq[0], seq[2], seq[4], etc.  Even if step is some other positive
number, seq[0] will always be chosen."

It's not true that in almost all cases the step is 2. How that is
evaluated directly depends on the number of available courts. Anyways,
you're right that seq[0] is always evaluated. That's why my algorithm
works fine when there are odd numbers of players in a league. But if
you will notice, my original question was how I could ADD TO or AMMEND
my current code to account for even number of players. I have used an
algorithm that comes up with all possible pairings and then randomly
puts people together each week and places players in a bye list
according to how many times they've previously been in the bye list
but since I was dealing with random permutations, the algorithm took
minutes to evaluate when there were more than 10 players in the
league.


From rcdailey at gmail.com  Mon May  4 22:25:42 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Mon, 4 May 2009 19:25:42 -0700 (PDT)
Subject: subprocess & shared environments
References: <8c79f749-e648-4a2e-afad-4053a8ec5cbd@f41g2000pra.googlegroups.com>
	<98aa4906-5006-437a-8fc0-0eaedf433be9@3g2000yqk.googlegroups.com>
Message-ID: <f361a85c-65a3-4678-9122-5a12e031cd1b@p4g2000vba.googlegroups.com>

On May 1, 4:18?pm, Aaron Brady <castiro... at gmail.com> wrote:
> On May 1, 12:09?am, Robert Dailey <rcdai... at gmail.com> wrote:
>
> > I'm currently calling subprocess.call() on a batch file (in Windows)
> > that sets a few environment variables that are needed by further
> > processes started via subprocess.call(). How can I persist the
> > environment modifications by the first call() function? I've done my
> > own searching on this and I came up with nothing.
>
> > Help is appreciated.
>
> I don't know if this will work, but you can try spawning a batch file
> that calls the first program to set the variables, then executes the
> second program. ?You might need to create that batch file by hand, as
> well as the command line for the second process.
>
> You can also try setting the env. variables in the parent process, and
> restoring them after.

Thanks for your help guys. Unfortunately both ideas will not work. I
guess I should have mentioned that the batch file in question is
vsvars32.bat, from the Visual Studio installation directory. I should
not modify this file, nor can I create a "wrapper" batch file as you
suggested, since I call several other batch files at different times.
There's about 6 other nmake calls I make that each is preceeded with a
call to vsvars32.bat. For now I'm using the && DOS operator, this
seems to work, however it is not ideal.


From soumen08 at gmail.com  Mon May  4 22:30:13 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Tue, 5 May 2009 08:00:13 +0530
Subject: local module-docs server on Linux?
Message-ID: <f6a09c160905041930s643646f6s8d4cdd928200b2ac@mail.gmail.com>

Hello,
I had used python on windows and one of the features i liked best was
that you could start a module-docs server and then use firefox to
access it. This would show module-docs for all modules you had
installed(including any 3rd party installs) . How do i do this on
linux?
regards
Soumen


From gallium.arsenide at gmail.com  Mon May  4 22:33:29 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Mon, 4 May 2009 19:33:29 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com>
Message-ID: <8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com>

On May 4, 8:56?pm, Ross <ross.j... at gmail.com> wrote:

> Anyways, you're right that seq[0] is always evaluated.
> That's why my algorithm works fine when there are odd
> numbers of players in a league.

It doesn't work fine for all odd numbers of players.  For example, 15
players on 3 courts should result in 5 byes.  But what actually
happens with your code is that you get 4 byes or 8 byes, depending on
whether you've got floating-point division enabled.

So the way you are selecting byes does not even guarantee that you'll
allocate the correct number of active matches for the number of
courts, and this is due to the fact that the extended slice is too
"coarse" a tool for the task.  Now, it may be that for you, the number
of players and courts is always within a confined range such that
extended slicing and your magic constants will work.  That's fine for
you, but we weren't given that information.

I haven't even begun to look at what happens for doubles.

John


From david.lyon at preisshare.net  Mon May  4 22:52:38 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Mon, 04 May 2009 22:52:38 -0400
Subject: local module-docs server on =?UTF-8?Q?Linux=3F?=
In-Reply-To: <f6a09c160905041930s643646f6s8d4cdd928200b2ac@mail.gmail.com>
References: <f6a09c160905041930s643646f6s8d4cdd928200b2ac@mail.gmail.com>
Message-ID: <153af629ebccc7f8a28813ae89d2acc4@preisshare.net>

Hi Soumen,

You could try running the Python Package Manager that we are developing
on sourceforge.

There isn't a release yet but we have implemented two buttons inside
the program for 'Examples' and 'Documentation'.

What they do is go off and find any documentation files or example
directories for third party modules that are installed on the system.

Then, if found, they will open a web browser on any documentation
or examples directories.

In the spirit of open source you could give it a try....

svn co https://pythonpkgmgr.svn.sourceforge.net/svnroot/pythonpkgmgr
pythonpkgmgr

Any feedback is welcome..

David

On Tue, 5 May 2009 08:00:13 +0530, Soumen banerjee <soumen08 at gmail.com>
wrote:
> Hello,
> I had used python on windows and one of the features i liked best was
> that you could start a module-docs server and then use firefox to
> access it. This would show module-docs for all modules you had
> installed(including any 3rd party installs) . How do i do this on
> linux?
> regards
> Soumen
> --
> http://mail.python.org/mailman/listinfo/python-list



From ross.jett at gmail.com  Mon May  4 23:01:34 2009
From: ross.jett at gmail.com (Ross)
Date: Mon, 4 May 2009 20:01:34 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com>
Message-ID: <54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com>

On May 4, 7:33?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 4, 8:56?pm, Ross <ross.j... at gmail.com> wrote:
>
> > Anyways, you're right that seq[0] is always evaluated.
> > That's why my algorithm works fine when there are odd
> > numbers of players in a league.
>
> It doesn't work fine for all odd numbers of players. ?For example, 15
> players on 3 courts should result in 5 byes. ?But what actually
> happens with your code is that you get 4 byes or 8 byes, depending on
> whether you've got floating-point division enabled.
>
> So the way you are selecting byes does not even guarantee that you'll
> allocate the correct number of active matches for the number of
> courts, and this is due to the fact that the extended slice is too
> "coarse" a tool for the task. ?Now, it may be that for you, the number
> of players and courts is always within a confined range such that
> extended slicing and your magic constants will work. ?That's fine for
> you, but we weren't given that information.
>
> I haven't even begun to look at what happens for doubles.
>
> John

You're right... I only tested cases when number of people playing
outnumbered the number of byes that week. Anyways, I'm new to
programming and this has been a good learning experience. Next time
around, I'll be sure to thoroughly comment my code before I ask for
help on it. I really appreciate all the help that you've offered so
far. Right now, I'm debating whether I should try to reinvent the
round_robin generator part of the code or whether there still might be
a way to shuffle the results of the generated output so that I can
slice it effectively.


From steven at REMOVE.THIS.cybersource.com.au  Mon May  4 23:22:34 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 03:22:34 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
Message-ID: <pan.2009.05.05.03.22.33@REMOVE.THIS.cybersource.com.au>

On Mon, 04 May 2009 15:51:15 -0700, Carl Banks wrote:

> All
> recursion does it make what you're doing a lot less readable for almost
> all programmers.

What nonsense. There are many algorithms that are more understandable 
written recursively than iteratively -- consult any good text book for 
examples. There are algorithms that are naturally iterative, and 
algorithms which are naturally recursive (and a few which are equally 
simple either way), and forcing either one into the other form leads to 
complicated and confusing code. This especially holds for mutually-
recursive functions, where re-writing them to be iterative is usually 
very difficult.

Sometimes it's worth rewriting a recursive algorithm to be iterative for 
the performance optimization, but that comes at the price of reduced 
readability.



-- 
Steven



From damienlmoore at gmail.com  Mon May  4 23:24:40 2009
From: damienlmoore at gmail.com (dmoore)
Date: Mon, 4 May 2009 20:24:40 -0700 (PDT)
Subject: Problem with case insensitive volumes
Message-ID: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>

Does anyone know of a way to get the unique pathname for files stored
on FAT32 or other case insensitive drives?

For example:

os.path.samefile('/media/usbkey/file1.jpg','/media/usbkey/FILE1.jpg')

returns True

but, is there a simple way to determine whether '/media/usbkey/
file1.jpg' or '/media/usbkey/FILE1.jpg' is the actual representation
on the device.

it matters because operations like this have meaning:

os.rename('/media/usbkey/file1.jpg','/media/usbkey/tmp')
os.rename('/media/usbkey/tmp','/media/usbkey/FILE1.jpg')

If I have a program that scans a directory for files and compares
against a stored list of pathnames, I want to be able to determine not
only that the file still exists but whether or not it has changed case
(i.e. '/media/usbkey/file1.jpg' has become '/media/usbkey/FILE1.jpg').

Any takers?


From steven at REMOVE.THIS.cybersource.com.au  Mon May  4 23:26:15 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 03:26:15 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
	<f17fd77e-43b9-4d97-ba29-4790def4826d@z7g2000vbh.googlegroups.com>
	<f6d22d90-b1e1-40f2-8647-834163638ce3@v35g2000pro.googlegroups.com>
Message-ID: <pan.2009.05.05.03.26.14@REMOVE.THIS.cybersource.com.au>

On Mon, 04 May 2009 16:33:13 -0700, Carl Banks wrote:

> On May 4, 4:06?pm, bearophileH... at lycos.com wrote:
>> Carl Banks:
>>
>> >1. Singly-linked lists can and should be handled with iteration.<
>>
>> I was talking about a binary tree with list-like topology, of course.
> 
> "(every node has 1 child, and they are chained)"
> 
> That's a singly-linked list, not a tree.  It's a degenerate tree at
> best.

A singly-linked list is a degenerate tree. Not "at best", but "is".


>> >All recursion does it make what you're doing a lot less readable for
>> >almost all programmers.<
>>
>> I can't agree.
> 
> If every child has one node you don't need recursion.

And if one single node in the entire tree has two children, you do. What 
are you suggesting, that Bearophile should write his tree-processing code 
to only deal with the degenerate case?



>> If the data structure is recursive (like a tree, or even sometimes
>> graphs, etc) a recursive algorithm is shorter, more readable and more
>> natural.
> 
> Because that's a tree, not a linked-list.

And a linked list is a degenerate tree. If you have a non-self-balancing 
tree, sometimes it will be degenerate, and your code needs to deal with 
it.


> Which is germane because Python's recursion limit is the thing you're
> complaining about here, and you don't normally hit that limit with real
> trees because they rarely go 1000 deep.

And if just ONE branch of the tree goes 1000 deep, even if the rest of 
the tree is shallow, then you hit the default recursion limit.


> Singly-linked lists don't count because you don't need recursion for
> them.

If each node has two (or more) child fields, even if only one of those 
children is non-empty, then your data structure is a degenerate tree and 
does count.



> [snip strawman example]

It's not a strawman just because you don't like it. Dealing with 
degenerate trees is a genuine issue, and avoiding degenerate trees is the 
reason why people have developed more complicated structures like red-
black trees.



-- 
Steven


From alex at bluebottle.net.au  Tue May  5 00:12:56 2009
From: alex at bluebottle.net.au (Alex Jurkiewicz)
Date: Tue, 05 May 2009 12:12:56 +0800
Subject: Threaded alternatives to smtplib?
In-Reply-To: <m2eiv4oawo.fsf@cs.uu.nl>
References: <mailman.5028.1241416479.11746.python-list@python.org>	<767h7tF1b8q8gU1@mid.uni-berlin.de>	<mailman.5032.1241421573.11746.python-list@python.org>
	<m2eiv4oawo.fsf@cs.uu.nl>
Message-ID: <49FFBCC8.8080905@bluebottle.net.au>

Piet van Oostrum wrote:
>> AJ> if __name__ == '__main__':
>> AJ>    THREADS = []
>> AJ>    for i in range(CONCURRENCY):
>> AJ>        THREADS.append(threading.Thread(target=threadProcessRecipient))
>> AJ>    for thread in THREADS:
>> AJ>        thread.run()
>>     
>
> You should use thread.start(), not thread.run(). When you use run(), it
> will be sequential execution, as you experience. With start() you get
> concurrency
>   

Thanks! Changing this method call fixes the original problem we saw. In 
the process I've run into another though, seemingly a race condition / 
deadlock.

Our email script DKIM signs all messages with pydkim. Because this is so 
CPU intensive we run the signing in an external process, using 
dkimsign.py (which basically accepts the message on stdin, calls 
dkim.sign() on it and passes the result back on stdout). We call the 
DKIM signing while preparing each message in each thread like this:
cmd = subprocess.Popen(
    ['/usr/bin/nice', PYTHONBIN, 'dkimsign.py',
    DKIMSELECTOR,
    DKIMDOMAIN,
    DKIMPRIVATEKEYFILE],
    stdin = subprocess.PIPE,
    stdout = subprocess.PIPE)
message = cmd.communicate(message)[0]

The majority of the time (80%) our mail merge works fine -- messages are 
sent out in a multi-threaded manner. The rest of the time, some of the 
threads deadlock when calling dkimsign.py. Specifically, they stop 
during the communicate() call above. dkimsign.py never receives any 
input (hangs on message=sys.stdin.read()), and sits there waiting 
forever, which stops the thread from doing anything.

Is this a bug with subprocess? Is there some way to set a timeout on the 
communicate() call so I can detect these locks?

Cheers,
AJ
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From davea at ieee.org  Tue May  5 00:33:22 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 05 May 2009 00:33:22 -0400
Subject: Problem with case insensitive volumes
In-Reply-To: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
References: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
Message-ID: <49FFC192.40704@ieee.org>

dmoore wrote:
> Does anyone know of a way to get the unique pathname for files stored
> on FAT32 or other case insensitive drives?
>
> For example:
>
> os.path.samefile('/media/usbkey/file1.jpg','/media/usbkey/FILE1.jpg')
>
> returns True
>
> but, is there a simple way to determine whether '/media/usbkey/
> file1.jpg' or '/media/usbkey/FILE1.jpg' is the actual representation
> on the device.
>
> it matters because operations like this have meaning:
>
> os.rename('/media/usbkey/file1.jpg','/media/usbkey/tmp')
> os.rename('/media/usbkey/tmp','/media/usbkey/FILE1.jpg')
>
> If I have a program that scans a directory for files and compares
> against a stored list of pathnames, I want to be able to determine not
> only that the file still exists but whether or not it has changed case
> (i.e. '/media/usbkey/file1.jpg' has become '/media/usbkey/FILE1.jpg').
>
> Any takers?
>
>   
os;walk will tell you the correct case for each node.   So if it gives 
you a different case than the stored form, you have your answer.




From debatem1 at gmail.com  Tue May  5 00:45:44 2009
From: debatem1 at gmail.com (CTO)
Date: Mon, 4 May 2009 21:45:44 -0700 (PDT)
Subject: local module-docs server on Linux?
References: <mailman.5085.1241490619.11746.python-list@python.org>
Message-ID: <3792323b-c44c-47d0-ad90-21df767a4623@o20g2000vbh.googlegroups.com>

On May 4, 10:30?pm, Soumen banerjee <soume... at gmail.com> wrote:
> Hello,
> I had used python on windows and one of the features i liked best was
> that you could start a module-docs server and then use firefox to
> access it.

pydoc -p <port number>


From ur.liam at iksmlapan.reverse  Tue May  5 00:59:18 2009
From: ur.liam at iksmlapan.reverse (Napalmski)
Date: Tue, 5 May 2009 05:59:18 +0100
Subject: Question of UTF16BE encoding / decoding
Message-ID: <MPG.2469d7edf8bbcd0a989683@eu.news.astraweb.com>

Hello,

I have an encoded string in the form "004e006100700061006c006d", if you 
split on every 4 characters it decodes to a single character.
I have come up with this:

name = '004e006100700061006c006d'
name2 = ""
for x in range(0, len(name), 4):
    name2 = name2 + chr(int(name[x:x+4], 16))

Is there a better way to do this using name.decode() that would then 
also work with .encode()?

I have tried .decode("utf-16-be"), which I beleive is the format here, 
but I am getting the error:
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-
11: ordinal not in range(128)

And my debugger seems to show a load of unicode when it breaks.

Thank you!


From gallium.arsenide at gmail.com  Tue May  5 01:12:03 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Mon, 4 May 2009 22:12:03 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com>
Message-ID: <fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com>

On May 4, 11:01 pm, Ross <ross.j... at gmail.com> wrote:
> Anyways, I'm new to
> programming and this has been a good learning experience.

I'm glad that you've been trying, and seem to be sticking it out
despite sometimes getting negative feedback here.

> Next time around, I'll be sure to thoroughly comment
> my code before I ask for help on it.

The best documentation, especially for a language like Python, is
simply logical variable names and sensible conventions.  I bring this
up because I'm wary of the word "thoroughly".  When you're dealing
with experts, it's actually best to use inline comments sparingly;
they can figure out what code does.  The overall problem description
at the top is important, as well as explanation of "magic numbers" and
such.

> I really appreciate all the help that you've offered so far.

You're welcome.  I'm not sure how much I've helped, especially as I'm
frankly not one of the stronger programmers here.

> Right now, I'm debating whether I should try to reinvent
> the round_robin generator part of the code or whether
> there still might be a way to shuffle the results of the
> generated output so that I can slice it effectively.

If you are going to typically have roughly enough courts for your
players (as implied by your test data), then maybe there's still a
chance for using extended slicing.  Just make sure you don't always
pick the first element.  If the number of players and the number of
courts can vary wildly, and won't always match up at least sort of
nicely, then the problem may require bigger guns (either much better
math or much more sophisticated programming).

John


From metolone+gmane at gmail.com  Tue May  5 01:21:29 2009
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Mon, 4 May 2009 22:21:29 -0700
Subject: Question of UTF16BE encoding / decoding
References: <MPG.2469d7edf8bbcd0a989683@eu.news.astraweb.com>
Message-ID: <gtoicj$531$1@ger.gmane.org>


"Napalmski" <ur.liam at iksmlapan.reverse> wrote in message 
news:MPG.2469d7edf8bbcd0a989683 at eu.news.astraweb.com...
> Hello,
>
> I have an encoded string in the form "004e006100700061006c006d", if you
> split on every 4 characters it decodes to a single character.
> I have come up with this:
>
> name = '004e006100700061006c006d'
> name2 = ""
> for x in range(0, len(name), 4):
>    name2 = name2 + chr(int(name[x:x+4], 16))
>
> Is there a better way to do this using name.decode() that would then
> also work with .encode()?
>
> I have tried .decode("utf-16-be"), which I beleive is the format here,
> but I am getting the error:
> UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-
> 11: ordinal not in range(128)
>
> And my debugger seems to show a load of unicode when it breaks.

import binascii
s = '004e006100700061006c006d'
h = binascii.unhexlify(s)
print h.decode('utf-16-be')

-Mark




From gagsl-py2 at yahoo.com.ar  Tue May  5 01:47:31 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 05 May 2009 02:47:31 -0300
Subject: subprocess & shared environments
References: <8c79f749-e648-4a2e-afad-4053a8ec5cbd@f41g2000pra.googlegroups.com>
	<98aa4906-5006-437a-8fc0-0eaedf433be9@3g2000yqk.googlegroups.com>
	<f361a85c-65a3-4678-9122-5a12e031cd1b@p4g2000vba.googlegroups.com>
Message-ID: <op.utfzphtsx6zn5v@lepton.softlabbsas.com.ar>

En Mon, 04 May 2009 23:25:42 -0300, Robert Dailey <rcdailey at gmail.com>  
escribi?:

> Thanks for your help guys. Unfortunately both ideas will not work. I
> guess I should have mentioned that the batch file in question is
> vsvars32.bat, from the Visual Studio installation directory. I should
> not modify this file, nor can I create a "wrapper" batch file as you
> suggested, since I call several other batch files at different times.
> There's about 6 other nmake calls I make that each is preceeded with a
> call to vsvars32.bat. For now I'm using the && DOS operator, this
> seems to work, however it is not ideal.

There is nothing special about vsvars32.bat. If you execute it before your  
first program (maybe inside a .cmd that calls vsvars32 and then your  
program) then all the spawned programs will already see those settings. No  
need to invoke it over and over.
Also, if you enter the same settings in the registry (so they become  
persistent) you don't have to worry again.

-- 
Gabriel Genellina



From joelriv at gmail.com  Tue May  5 02:00:05 2009
From: joelriv at gmail.com (Joel Juvenal Rivera Rivera)
Date: Tue, 05 May 2009 01:00:05 -0500
Subject: Any idea to emulate tail -f
Message-ID: <1241503205.5374.25.camel@keblar.lapjoe>

I want to make something very similar to  the command tail -f (follow a
file), i have been trying  with some while True and some microsleeps
(about .1 s); did someone has already done something like this?

And about the file is the apache acceslog  of a site with a lot of
traffic.

Regards    

joe / Joel Rivera



From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 02:08:24 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 06:08:24 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
Message-ID: <pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>

On Mon, 04 May 2009 17:54:50 -0400, Terry Reedy wrote:

> bearophileHUGS at lycos.com wrote:
> 
>> Another possible syntax:
>> 
>> def fact(n):
>>     return 1 if n <= 1 else n * return(n - 1)
>> 
>> But I guess most people don't see this problem as important&common
>> enough to justify changing the language.
> 
> Actually, I would like a way to refer to the current function from
> inside a function.  but I would like support in the language, so that
> the compiler patched the code after the function object is created to
> directly refer to the function object (or can the code object call the
> code object?) without any name lookup at all.

I don't know about avoiding name lookup, that smacks of deepest black 
magic, and Python doesn't usually do that. It does however do parlour 
tricks like `__name__` and `self`, suggests a solution.

I propose a small piece of sugar. When a function is entered, Python 
creates an ordinary local name in the function's local namespace, and 
binds the function itself to that name. Two possibilities for the name 
are `this` or `__this__`, analogous to `self` in methods and `__name__` 
in modules.

If there is any support for this, I propose to send the following (long) 
post to python-ideas. Feedback, corrections and suggestions welcome.


* * * 


Summary:

Most objects in Python don't need to know what name, or names (if any) 
they are bound to. Functions are a conspicuous exception to that rule: 
there are good reasons for a function to refer to itself, and the only 
straightforward way to do so is by name. I propose that on calling a 
function, Python should create a local name which refers to the function 
itself, giving the programmer the ability to have a function refer to 
itself without using its name.


There are (at least) four reasons for a function to refer to itself. In 
no particular order:

(1) User-friendly messages (for logging, errors or other):

def parrot():
    print "Error feeding cracker to function %r" % parrot


(2) Recursion:

def spam(n):
    if n < 0: return spam(-n).upper()
    return "spam "*n


(3) Introspection:

def spanish_inquisition():
    print inspect.getmembers(spanish_inquisition)


(4) Storing data between function calls:

def cheeseshop():
    if hasattr(cheeseshop, 'cheeses'):
        print "We have many fine cheeses"
    else:
        print "I'm sorry, I have been wasting your time"


I call these self-reflective functions.

In some cases there are alternatives e.g. cheeseshop could be written as 
a functor object, or some recursive functions can be re-written as 
iteration. Nevertheless such self-reflective functions are acceptable to 
many people, and consequently in moderately common use. How to have a 
function refer to itself is a common question, e.g. for newbies:

http://www.mail-archive.com/tutor%40python.org/msg35114.html

and even more experienced programmers:

http://article.gmane.org/gmane.comp.python.general/622020

(An earlier draft of this proposal was sent to that thread.)


However, none of these functions are robust in the face of the function 
being renamed, either at runtime or in the source code. In general, this 
will fail for any of the above functions:

func = spam
del spam
func()

Self-reflective functions like these are (almost?) unique in Python in 
that they require a known name to work correctly. You can rename a class, 
instance or module and expect it to continue to work, but not so for such 
functions. When editing source code, it is very easy to forget to change 
all the references to the function name within the body of itself 
function, even for small functions, and refactoring tools are overkill.

My proposal is for Python to automatically generate a local variable 
named either `this` or `__this__` when entering a function. This will 
allow any of the above functions to be re-written using the special name, 
and become robust against name changes.

def spanish_inquisition():
    print inspect.getmembers(__this__)

fang = spanish_inquisition
del spanish_inquisition
fang()


It will also allow lambda to use recursion:

lambda n: 0 if n <= 1 else __this__(n-1)

(This may count as a point against it, for those who dislike lambda.)


It is often useful to create two similar functions, or a variant of a 
function, without duplicating the source code. E.g. you might want a 
function that uses a cache, while still keeping around the version 
without a cache:

cached_function = memoize(function)
    
Currently, this does not give the expected results for recursive 
functions, nor does it give an error. It simply fails to behave as 
expected. Re-writing function() to use __this__ for the recursive call 
will solve that problem.


Q: Will `__this__` or `this` clash with existing variables?

I prefer `this` over `__this__`, for analogy with `self` inside methods. 
However it is more likely that existing code already uses the name 
`this`, since double-leading-and-trailing-underscore names are reserved 
for use by Python. Because `this` is an ordinary local variable, if a 
function assigns to it the function will work as expected. The only 
meaningful clash I can think of will occur when a function refers to a 
non-local name `this` without declaring it first. Another obvious clash 
may be:

def function():
    import this
    ...

Both of these are likely to be very rare.

Q: Will there be a performance penalty if every function defines the name 
`__this__` on entry?

I don't expect so, but if it is found to be a problem, a slightly more 
sophisticated strategy would be to only define `__this__` inside the 
function if the body of the function refers to that variable. That will 
allow the majority of functions which are not self-reflective to avoid 
paying that (probably minuscule) cost.


Q: Is this really necessary?

This is sugar, a convenience for the programmer. None of the problems it 
solves cannot be solved, or worked around, by other methods. 
Nevertheless, that the question "how do I have my function refer to 
itself?" keeps being asked over and over again suggests that the current 
solutions are (1) not obvious to newbies, and (2) not entirely 
satisfactory to more experienced programmers.


Here is a proof-of-concept pure Python implementation, using a decorator, 
and abusing a global variable. This is NOT to imply that `__this__` 
should be a global if this proposal goes ahead.


from functools import wraps
def make_this(func):
    global __this__
    __this__ = func
    @wraps(func)
    def f(*args, **kwargs):
        return func(*args, **kwargs)
    return f


>>> @make_this
... def spam(n):
...     if n < 0: return __this__(-n).upper()
...     return ' '.join([__this__.__name__] * n)
...
>>> tasty_meat_like_product = spam
>>> del spam
>>> tasty_meat_like_product(-3)
'SPAM SPAM SPAM'



-- 
Steven


From pavlovevidence at gmail.com  Tue May  5 02:09:25 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 4 May 2009 23:09:25 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com> 
	<pan.2009.05.05.03.22.33@REMOVE.THIS.cybersource.com.au>
Message-ID: <37e0021f-b50c-4f0c-8ba5-0beed01da029@z16g2000prd.googlegroups.com>

On May 4, 8:22?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 04 May 2009 15:51:15 -0700, Carl Banks wrote:
> > All
> > recursion does it make what you're doing a lot less readable for almost
> > all programmers.
>
> What nonsense.

It's not nonsense for a singly-linked list.  I don't need to be taught
the benefit of recursion, but whenever interation is suitable for an
algorithm/data structure, as it is with singly-linked lists, then it
is the more readable and more preferrable choice, especially in
Python.

In Python the One Obvious Way is iteration when possible, recursion
when necessary.


Carl Banks


From ur.liam at iksmlapan.reverse  Tue May  5 02:20:14 2009
From: ur.liam at iksmlapan.reverse (Napalmski)
Date: Tue, 5 May 2009 07:20:14 +0100
Subject: Question of UTF16BE encoding / decoding
References: <MPG.2469d7edf8bbcd0a989683@eu.news.astraweb.com>
	<mailman.5089.1241500903.11746.python-list@python.org>
Message-ID: <MPG.2469e0201cb6d830989684@eu.news.astraweb.com>

In article <mailman.5089.1241500903.11746.python-list at python.org>, 
metolone+gmane at gmail.com says...
> 
> 
> import binascii
> s = '004e006100700061006c006d'
> h = binascii.unhexlify(s)
> print h.decode('utf-16-be')
> 
> -Mark

And: 
name2 = name2.encode("utf-16-be")
print binascii.b2a_hex(name2)

to re-encode,
Thank you, much appreciated!


From sri_annauni at yahoo.co.in  Tue May  5 02:41:06 2009
From: sri_annauni at yahoo.co.in (srinivasan srinivas)
Date: Tue, 5 May 2009 12:11:06 +0530 (IST)
Subject: Which one is best Python or Java for developing GUI applications?
Message-ID: <793408.86105.qm@web7903.mail.in.yahoo.com>


Could you tell me does Python have any advantages over Java for the development of GUI applications?

Thanks,
Srini


      Now surf faster and smarter ! Check out the new Firefox 3 - Yahoo! Edition http://downloads.yahoo.com/in/firefox/?fr=om_email_firefox


From clp2 at rebertia.com  Tue May  5 02:46:58 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 4 May 2009 23:46:58 -0700
Subject: Self function
In-Reply-To: <pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com>

On Mon, May 4, 2009 at 11:08 PM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
> On Mon, 04 May 2009 17:54:50 -0400, Terry Reedy wrote:
>
>> bearophileHUGS at lycos.com wrote:
>>
>>> Another possible syntax:
>>>
>>> def fact(n):
>>> ? ? return 1 if n <= 1 else n * return(n - 1)
>>>
>>> But I guess most people don't see this problem as important&common
>>> enough to justify changing the language.
>>
>> Actually, I would like a way to refer to the current function from
>> inside a function. ?but I would like support in the language, so that
>> the compiler patched the code after the function object is created to
>> directly refer to the function object (or can the code object call the
>> code object?) without any name lookup at all.
>
> I don't know about avoiding name lookup, that smacks of deepest black
> magic, and Python doesn't usually do that. It does however do parlour
> tricks like `__name__` and `self`, suggests a solution.
>
> I propose a small piece of sugar. When a function is entered, Python
> creates an ordinary local name in the function's local namespace, and
> binds the function itself to that name. Two possibilities for the name
> are `this` or `__this__`, analogous to `self` in methods and `__name__`
> in modules.
>
> If there is any support for this, I propose to send the following (long)
> post to python-ideas. Feedback, corrections and suggestions welcome.

<snip entire excellent proposal text>

While I'm +0 on the proto-PEP, it doesn't currently address (or at
least rebut hard enough) the inevitable obvious naysayer argument
which will go along the lines of:

<devils_advocate>
Adding syntax is EVIL(tm) for it angers the Gods of Backwards
Compatibility, and this proposal is completely unnecessary because you
could instead just write:

def recursive(func):
    """We caved enough to allow this into functools."""
    def wrapper(*args, **kwds):
        return func(func, *args, **kwds)
    return wrapper
#####
from functools import recursive
@recursive
def spam(this, number_of_thy_counting):
    print " ".join([this.__name__.capitalize() + "!"]*number_of_thy_counting)

Which is not significantly more complex/longer/painful than learning
about __this__'s existence or typing the extra underscores and it
doesn't require any new syntax.

And the performance penalty for the proposed feature would actually be horrible!
And there would be much clashing with existing variable names, for
keywords are the Devil's work!
And your mother wears combat boots!
(etc...)
</devils_advocate>

You touch on this in "Is this really necessary?", but I think you're
going to prove more persuasively how drastically sweeter this syntax
sugar would be.

Cheers,
Chris
-- 
The Devil's Advocate-General
http://blog.rebertia.com


From debatem1 at gmail.com  Tue May  5 02:50:52 2009
From: debatem1 at gmail.com (CTO)
Date: Mon, 4 May 2009 23:50:52 -0700 (PDT)
Subject: Any idea to emulate tail -f
References: <mailman.5091.1241503147.11746.python-list@python.org>
Message-ID: <99114d6c-9d12-4b74-9b7c-ce32377a8b61@21g2000vbk.googlegroups.com>

On May 5, 2:00?am, Joel Juvenal Rivera Rivera <joel... at gmail.com>
wrote:
> I want to make something very similar to ?the command tail -f (follow a
> file), i have been trying ?with some while True and some microsleeps
> (about .1 s); did someone has already done something like this?
>
> And about the file is the apache acceslog ?of a site with a lot of
> traffic.
>
> Regards ? ?
>
> joe / Joel Rivera

You might want to try http://pyinotify.sourceforge.net/. Works well on
Linux systems. Otherwise, I'd watch the mtime on the file and fork to
handle the change.

Geremy Condra


From pavlovevidence at gmail.com  Tue May  5 02:55:41 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 4 May 2009 23:55:41 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com> 
	<f17fd77e-43b9-4d97-ba29-4790def4826d@z7g2000vbh.googlegroups.com> 
	<f6d22d90-b1e1-40f2-8647-834163638ce3@v35g2000pro.googlegroups.com> 
	<pan.2009.05.05.03.26.14@REMOVE.THIS.cybersource.com.au>
Message-ID: <04ed259e-01cf-459b-8664-a1dd6a23d60e@d19g2000prh.googlegroups.com>

On May 4, 8:26?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 04 May 2009 16:33:13 -0700, Carl Banks wrote:
> > On May 4, 4:06?pm, bearophileH... at lycos.com wrote:
> >> Carl Banks:
>
> >> >1. Singly-linked lists can and should be handled with iteration.<
>
> >> I was talking about a binary tree with list-like topology, of course.
>
> > "(every node has 1 child, and they are chained)"
>
> > That's a singly-linked list, not a tree. ?It's a degenerate tree at
> > best.
>
> A singly-linked list is a degenerate tree. Not "at best", but "is".

No, many implemenations of singly-linked lists aren't trees by any
definition.  You are probably thinking of the bastardized list-tree
spawn they use in Lisp.  But many implementations don't even bother
with a cons cell and just have the object itself refer to the next
object.  That is not a tree.

But even singly-linked lists implemented with cons cells can be
handled, and are better handled, with interation.


> >> >All recursion does it make what you're doing a lot less readable for
> >> >almost all programmers.<
>
> >> I can't agree.
>
> > If every child has one node you don't need recursion.
>
> And if one single node in the entire tree has two children, you do.

Then it't not a singly-linked list.  It's a tree.


> What
> are you suggesting, that Bearophile should write his tree-processing code
> to only deal with the degenerate case?

I'm suggesting that Bearophile should write recursive code for his
trees and iterative code for his lists.


> >> If the data structure is recursive (like a tree, or even sometimes
> >> graphs, etc) a recursive algorithm is shorter, more readable and more
> >> natural.
>
> > Because that's a tree, not a linked-list.
>
> And a linked list is a degenerate tree. If you have a non-self-balancing
> tree, sometimes it will be degenerate, and your code needs to deal with
> it.

If you have a tree, then you use recursive code.  If you have a list
you use iterative code.


> > Which is germane because Python's recursion limit is the thing you're
> > complaining about here, and you don't normally hit that limit with real
> > trees because they rarely go 1000 deep.
>
> And if just ONE branch of the tree goes 1000 deep, even if the rest of
> the tree is shallow, then you hit the default recursion limit.

Yeah, well, see that's just the point here.  Bearophile was asked if
any of his trees go 1000 deep, he said yes, his singly-linked lists
do.  Well, I'm sorry, that's not going to convince me, because
bearophile should be using iteration for the singly-linked lists.

Bearophile might very well have real trees that are 1000 deep, but
that's not going to convince me either, because IMO real trees rarely
do that, and Python's recursion limit can be increased in the rare
cases they do.

Bearophile and you are welcome to try to convince me that there are
lots of real trees out there that can't be handled with iteration and
that do go 1000 deep, and that this is a common enough problem that
Python should drastically improve support for recursion.  Until then I
will opine that it is adequate now for almost all purposes.


> > Singly-linked lists don't count because you don't need recursion for
> > them.
>
> If each node has two (or more) child fields, even if only one of those
> children is non-empty, then your data structure is a degenerate tree and
> does count.

If one of the fields is always empty, you don't need recursion to deal
with it.


> > [snip strawman example]
>
> It's not a strawman just because you don't like it.

No, it's a strawman because I said singly-linked lists don't need
recursion, and his counterexample was showing that recursion was
useful a tree.  Which was true, but it wasn't answering my argument.


> Dealing with
> degenerate trees is a genuine issue, and avoiding degenerate trees is the
> reason why people have developed more complicated structures like red-
> black trees.

I'm not talking about degenerate trees.  I'm talking about singly-
linked lists, which you DO NOT NEED, and SHOULD NOT USE, recursion to
deal with.


Carl Banks


From arnodel at googlemail.com  Tue May  5 03:09:27 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 5 May 2009 00:09:27 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <4b6c0d49-5a05-42ff-8990-9a483c0f62b9@g20g2000vba.googlegroups.com>

On 5 May, 07:08, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 04 May 2009 17:54:50 -0400, Terry Reedy wrote:
> > bearophileH... at lycos.com wrote:
>
> >> Another possible syntax:
>
> >> def fact(n):
> >> ? ? return 1 if n <= 1 else n * return(n - 1)
>
> >> But I guess most people don't see this problem as important&common
> >> enough to justify changing the language.
>
> > Actually, I would like a way to refer to the current function from
> > inside a function. ?but I would like support in the language, so that
> > the compiler patched the code after the function object is created to
> > directly refer to the function object (or can the code object call the
> > code object?) without any name lookup at all.
>
> I don't know about avoiding name lookup, that smacks of deepest black
> magic, and Python doesn't usually do that. It does however do parlour
> tricks like `__name__` and `self`, suggests a solution.
>
> I propose a small piece of sugar. When a function is entered, Python
> creates an ordinary local name in the function's local namespace, and
> binds the function itself to that name. Two possibilities for the name
> are `this` or `__this__`, analogous to `self` in methods and `__name__`
> in modules.
>
> If there is any support for this, I propose to send the following (long)
> post to python-ideas. Feedback, corrections and suggestions welcome.
>
> * * *
>
> Summary:
>
> Most objects in Python don't need to know what name, or names (if any)
> they are bound to. Functions are a conspicuous exception to that rule:
> there are good reasons for a function to refer to itself, and the only
> straightforward way to do so is by name. I propose that on calling a
> function, Python should create a local name which refers to the function
> itself, giving the programmer the ability to have a function refer to
> itself without using its name.
>
> There are (at least) four reasons for a function to refer to itself. In
> no particular order:
>
> (1) User-friendly messages (for logging, errors or other):
>
> def parrot():
> ? ? print "Error feeding cracker to function %r" % parrot
>
> (2) Recursion:
>
> def spam(n):
> ? ? if n < 0: return spam(-n).upper()
> ? ? return "spam "*n
>
> (3) Introspection:
>
> def spanish_inquisition():
> ? ? print inspect.getmembers(spanish_inquisition)
>
> (4) Storing data between function calls:
>
> def cheeseshop():
> ? ? if hasattr(cheeseshop, 'cheeses'):
> ? ? ? ? print "We have many fine cheeses"
> ? ? else:
> ? ? ? ? print "I'm sorry, I have been wasting your time"
>
> I call these self-reflective functions.
>
> In some cases there are alternatives e.g. cheeseshop could be written as
> a functor object, or some recursive functions can be re-written as
> iteration. Nevertheless such self-reflective functions are acceptable to
> many people, and consequently in moderately common use. How to have a
> function refer to itself is a common question, e.g. for newbies:
>
> http://www.mail-archive.com/tutor%40python.org/msg35114.html
>
> and even more experienced programmers:
>
> http://article.gmane.org/gmane.comp.python.general/622020
>
> (An earlier draft of this proposal was sent to that thread.)
>
> However, none of these functions are robust in the face of the function
> being renamed, either at runtime or in the source code. In general, this
> will fail for any of the above functions:
>
> func = spam
> del spam
> func()
>
> Self-reflective functions like these are (almost?) unique in Python in
> that they require a known name to work correctly. You can rename a class,
> instance or module and expect it to continue to work, but not so for such
> functions. When editing source code, it is very easy to forget to change
> all the references to the function name within the body of itself
> function, even for small functions, and refactoring tools are overkill.
>
> My proposal is for Python to automatically generate a local variable
> named either `this` or `__this__` when entering a function. This will
> allow any of the above functions to be re-written using the special name,
> and become robust against name changes.
>
> def spanish_inquisition():
> ? ? print inspect.getmembers(__this__)
>
> fang = spanish_inquisition
> del spanish_inquisition
> fang()
>
> It will also allow lambda to use recursion:
>
> lambda n: 0 if n <= 1 else __this__(n-1)
>
> (This may count as a point against it, for those who dislike lambda.)
>
> It is often useful to create two similar functions, or a variant of a
> function, without duplicating the source code. E.g. you might want a
> function that uses a cache, while still keeping around the version
> without a cache:
>
> cached_function = memoize(function)
>
> Currently, this does not give the expected results for recursive
> functions, nor does it give an error. It simply fails to behave as
> expected. Re-writing function() to use __this__ for the recursive call
> will solve that problem.
>
> Q: Will `__this__` or `this` clash with existing variables?
>
> I prefer `this` over `__this__`, for analogy with `self` inside methods.
> However it is more likely that existing code already uses the name
> `this`, since double-leading-and-trailing-underscore names are reserved
> for use by Python. Because `this` is an ordinary local variable, if a
> function assigns to it the function will work as expected. The only
> meaningful clash I can think of will occur when a function refers to a
> non-local name `this` without declaring it first. Another obvious clash
> may be:
>
> def function():
> ? ? import this
> ? ? ...
>
> Both of these are likely to be very rare.
>
> Q: Will there be a performance penalty if every function defines the name
> `__this__` on entry?
>
> I don't expect so, but if it is found to be a problem, a slightly more
> sophisticated strategy would be to only define `__this__` inside the
> function if the body of the function refers to that variable. That will
> allow the majority of functions which are not self-reflective to avoid
> paying that (probably minuscule) cost.
>
> Q: Is this really necessary?
>
> This is sugar, a convenience for the programmer. None of the problems it
> solves cannot be solved, or worked around, by other methods.
> Nevertheless, that the question "how do I have my function refer to
> itself?" keeps being asked over and over again suggests that the current
> solutions are (1) not obvious to newbies, and (2) not entirely
> satisfactory to more experienced programmers.
>
> Here is a proof-of-concept pure Python implementation, using a decorator,
> and abusing a global variable. This is NOT to imply that `__this__`
> should be a global if this proposal goes ahead.
>
> from functools import wraps
> def make_this(func):
> ? ? global __this__
> ? ? __this__ = func
> ? ? @wraps(func)
> ? ? def f(*args, **kwargs):
> ? ? ? ? return func(*args, **kwargs)
> ? ? return f
>
> >>> @make_this
>
> ... def spam(n):
> ... ? ? if n < 0: return __this__(-n).upper()
> ... ? ? return ' '.join([__this__.__name__] * n)
> ...>>> tasty_meat_like_product = spam
> >>> del spam
> >>> tasty_meat_like_product(-3)
>
> 'SPAM SPAM SPAM'
>
> --
> Steven- Hide quoted text -
>
> - Show quoted text -

Are you aware of PEP 3130? http://www.python.org/dev/peps/pep-3130/

(BTW, it seems to me that your implementation breaks as soon as two
functions are decorated - not tested!)

--
Arnaud


From debatem1 at gmail.com  Tue May  5 03:12:40 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 5 May 2009 00:12:40 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <611eb164-5eff-4021-8b1c-b45c0d85462f@l5g2000vbc.googlegroups.com>

On May 5, 2:08?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 04 May 2009 17:54:50 -0400, Terry Reedy wrote:
> > bearophileH... at lycos.com wrote:
>
> >> Another possible syntax:
>
> >> def fact(n):
> >> ? ? return 1 if n <= 1 else n * return(n - 1)
>
> >> But I guess most people don't see this problem as important&common
> >> enough to justify changing the language.
>
> > Actually, I would like a way to refer to the current function from
> > inside a function. ?but I would like support in the language, so that
> > the compiler patched the code after the function object is created to
> > directly refer to the function object (or can the code object call the
> > code object?) without any name lookup at all.
>
> I don't know about avoiding name lookup, that smacks of deepest black
> magic, and Python doesn't usually do that. It does however do parlour
> tricks like `__name__` and `self`, suggests a solution.
>
> I propose a small piece of sugar. When a function is entered, Python
> creates an ordinary local name in the function's local namespace, and
> binds the function itself to that name. Two possibilities for the name
> are `this` or `__this__`, analogous to `self` in methods and `__name__`
> in modules.
>
> If there is any support for this, I propose to send the following (long)
> post to python-ideas. Feedback, corrections and suggestions welcome.

[snip proposal]

I'm not all that in favor of this, but I think I've got another use
case
for you at http://code.activestate.com/recipes/576731/. The functions
written to use it would be a lot more standard looking at least.

Geremy Condra



From http  Tue May  5 03:22:48 2009
From: http (Paul Rubin)
Date: 05 May 2009 00:22:48 -0700
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
Message-ID: <7xk54wvws7.fsf@ruckus.brouhaha.com>

bearophileHUGS at lycos.com writes:
> This happens to me more than one time every year.
> So I have written this:
> ...
>         self_name = getframeinfo(currentframe()).function

ZOMG, you've got to be kidding.  I'd expect Pylint to catch that sort
of error statically.  If not, the best approach is probably to extend
Pylint to handle those cases.  The frame crawling stuff just comes
across as madness to me.


From http  Tue May  5 03:23:21 2009
From: http (Paul Rubin)
Date: 05 May 2009 00:23:21 -0700
Subject: Which one is best Python or Java for developing GUI applications?
References: <mailman.5092.1241505670.11746.python-list@python.org>
Message-ID: <7xfxfkvwra.fsf@ruckus.brouhaha.com>

srinivasan srinivas <sri_annauni at yahoo.co.in> writes:
> Could you tell me does Python have any advantages over Java for the development of GUI applications?

Yes.


From paul.nospam at rudin.co.uk  Tue May  5 03:26:56 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Tue, 05 May 2009 08:26:56 +0100
Subject: Which one is best Python or Java for developing GUI applications?
References: <mailman.5092.1241505670.11746.python-list@python.org>
	<7xfxfkvwra.fsf@ruckus.brouhaha.com>
Message-ID: <87d4ao9fi7.fsf@rudin.co.uk>

Paul Rubin <http://phr.cx at NOSPAM.invalid> writes:

> srinivasan srinivas <sri_annauni at yahoo.co.in> writes:
>> Could you tell me does Python have any advantages over Java for the
>> development of GUI applications?
>
> Yes.

Clearly c.l.p needs to adopt the SNB <http://cam.misc.org.uk/snb>
convention :) 


From gallium.arsenide at gmail.com  Tue May  5 03:32:03 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Tue, 5 May 2009 00:32:03 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com>
Message-ID: <991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com>

On May 5, 1:12?am, John Yeung <gallium.arsen... at gmail.com> wrote:

> [...] the problem may require bigger guns (either much better
> math or much more sophisticated programming).

Yes, I'm responding to myself.

Well, I went ahead with the approach I mentioned earlier, generating
all possible matches and then selecting among them as needed to fill
up the courts, trying to keep the number of matches played by each
player as fair as possible.  (I should mention that this, or something
similar, was suggested earlier by someone else in a different thread,
in response to the same question by the same OP.)

I did use "bigger guns" (mainly a class for player objects, with
custom __cmp__ method), but still didn't do anything with doubles.

I haven't tested it much, but I'll post it if anyone's interested.
(That way people can pick on me instead of the OP. ;)

John


From bruno.42.desthuilliers at websiteburo.invalid  Tue May  5 03:37:01 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 05 May 2009 09:37:01 +0200
Subject: Personal recommendations for Python and Django on-boarding
	materials
In-Reply-To: <m2k54wr6i6.fsf@googlemail.com>
References: <61ac6511-0f9e-458d-b3f1-5b153939293f@r34g2000vba.googlegroups.com>
	<m2k54wr6i6.fsf@googlemail.com>
Message-ID: <49ffec97$0$27576$426a74cc@news.free.fr>

Arnaud Delobelle a ?crit :
> Grant Rettke <grettke at gmail.com> writes:
> 
>> Hi folks,
>>
>> From one developer to another, I am looking for some personal
>> recommendations on what are the best materials for fast tracking an on-
>> boarding to Python and Django.
>>
>> I know how to program, get web apps and OO; this is the audience.
>>
>> I have found some good recommendations and stuff on Amazon and various
>> websites, but if I could get some humans vouching for things directly
>> that would be worth a lot more.
>>
>> Best wishes,
>>
>> Grant
> 
> I've learnt both Python and Django using the tutorials, the docs and
> lots of experimentation.

<aol />

>  Django now have a book [1] which might be
> useful to read.
> 
> [1] http://djangobook.com/
> 

<op>
You may also want to join the django-users group, browse 
django-snippets, and read James Bennet's blog.
</op>


From bruno.42.desthuilliers at websiteburo.invalid  Tue May  5 03:37:41 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 05 May 2009 09:37:41 +0200
Subject: Which one is best Python or Java for developing GUI applications?
In-Reply-To: <7xfxfkvwra.fsf@ruckus.brouhaha.com>
References: <mailman.5092.1241505670.11746.python-list@python.org>
	<7xfxfkvwra.fsf@ruckus.brouhaha.com>
Message-ID: <49ffecbf$0$27576$426a74cc@news.free.fr>

Paul Rubin a ?crit :
> srinivasan srinivas <sri_annauni at yahoo.co.in> writes:
>> Could you tell me does Python have any advantages over Java for the development of GUI applications?
> 
> Yes.

Indeed.


From mail at microcorp.co.za  Tue May  5 03:41:37 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 5 May 2009 09:41:37 +0200
Subject: Tkinter, Trouble with Message,Label widget
References: <mailman.5017.1241392410.11746.python-list@python.org><4f61c431-1c78-4de7-9b82-08eee09ae7d6@s20g2000vbp.googlegroups.com>
	<49FF853B.7040404@hughes.net>
Message-ID: <009201c9cd54$f1ac07e0$0d00a8c0@Hendrik>

"norseman" <norseman at hughes.net> wrote:

> Hendrik van Rooyen  mentioned the textvar too.  Thanks Hendrik

Yeah - and also omitted to mention the set method.
With friends like that, who needs enemies?

- Hendrik



From QJing.Li at gmail.com  Tue May  5 03:50:44 2009
From: QJing.Li at gmail.com (Leon)
Date: Tue, 5 May 2009 00:50:44 -0700 (PDT)
Subject: Which one is best Python or Java for developing GUI applications?
References: <mailman.5092.1241505670.11746.python-list@python.org>
Message-ID: <4da39bb0-7bfe-48bf-a843-0e79e567a56d@r3g2000vbp.googlegroups.com>

I think there are two advantages over java for GUI application

First, python is more productive and has very rich third modules
support,
you can check the demo of wxPython.

Second, you can develop native-looking GUI

BTW: I'm developing GUI application using python and wxPython.



Second,
On May 4, 11:41?pm, srinivasan srinivas <sri_anna... at yahoo.co.in>
wrote:
> Could you tell me does Python have any advantages over Java for the development of GUI applications?
>
> Thanks,
> Srini
>
> ? ? ? Now surf faster and smarter ! Check out the new Firefox 3 - Yahoo! Editionhttp://downloads.yahoo.com/in/firefox/?fr=om_email_firefox



From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 03:51:19 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 07:51:19 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
	<pan.2009.05.05.03.22.33@REMOVE.THIS.cybersource.com.au>
	<37e0021f-b50c-4f0c-8ba5-0beed01da029@z16g2000prd.googlegroups.com>
Message-ID: <pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>

On Mon, 04 May 2009 23:09:25 -0700, Carl Banks wrote:

> On May 4, 8:22?pm, Steven D'Aprano
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> On Mon, 04 May 2009 15:51:15 -0700, Carl Banks wrote:
>> > All
>> > recursion does it make what you're doing a lot less readable for
>> > almost all programmers.
>>
>> What nonsense.
> 
> It's not nonsense for a singly-linked list.

def ivisit(node):
    print node
    while node and node.link is not None:
        node = node.link
        print node

def rvisit(node):
    print node
    if node and node.link is not None:
        rvisit(node.link)


If there are programmers who find rvisit "a lot less readable" than 
ivisit, then in my arrogant opinion they should consider a change of 
profession.



> I don't need to be taught
> the benefit of recursion, but whenever interation is suitable for an
> algorithm/data structure, as it is with singly-linked lists, then it is
> the more readable and more preferrable choice, especially in Python.

Most (all?) recursive algorithms can be re-written as iteration. For many 
recursive algorithms (but not all) the cost for doing so is to simulate 
recursion yourself by managing your own stack. By making such an 
absolutist claim, you're claiming that it is "more readable" and "more 
preferable" to manage your own stack than to let the compiler do so. 
That's clearly nonsense.

Whenever iteration gives a simpler and more readable algorithm than 
recursion, then it should be preferred on account of being simpler and 
more readable. That's not just a no-brainer, it's a tautology. "Whenever 
iteration is simpler, it's simpler." But that's a far cry from what you 
said: that recursion, as a general technique, is "a lot less readable" 
for "almost all" programmers.


 
> In Python the One Obvious Way is iteration when possible, recursion when
> necessary.

There's nothing "obvious" about solving the 8 Queens problem using 
iteration. Or walking a binary tree. Or generating all the permutations 
of a list.

But don't just tell me that recursion isn't Pythonic. Tell Guido:

http://www.python.org/doc/essays/graphs.html

I quote:

"These [recursive] functions are about as simple as they get. Yet, they 
are nearly optimal (for code written in Python)."



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 03:58:15 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 07:58:15 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<4b6c0d49-5a05-42ff-8990-9a483c0f62b9@g20g2000vba.googlegroups.com>
Message-ID: <pan.2009.05.05.07.58.15@REMOVE.THIS.cybersource.com.au>

On Tue, 05 May 2009 00:09:27 -0700, Arnaud Delobelle wrote:

> Are you aware of PEP 3130? http://www.python.org/dev/peps/pep-3130/

I am now. Very disappointing.

> (BTW, it seems to me that your implementation breaks as soon as two
> functions are decorated - not tested!)

Of course it does! That's why I warned that I was "abusing a global 
variable", and that it should not be read as meaning that I wanted 
__this__ to be global. I want it to be local to the function.


If somebody can tell me how to inject a new local name into a function, 
that would be far preferable to using global in the decorator.



-- 
Steven


From pavlovevidence at gmail.com  Tue May  5 04:25:49 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 5 May 2009 01:25:49 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com> 
	<pan.2009.05.05.03.22.33@REMOVE.THIS.cybersource.com.au>
	<37e0021f-b50c-4f0c-8ba5-0beed01da029@z16g2000prd.googlegroups.com>
	<pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>
Message-ID: <5a8c7e8b-8b3d-4a47-9ac6-23bc85b512f4@d7g2000prl.googlegroups.com>

On May 5, 12:51?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 04 May 2009 23:09:25 -0700, Carl Banks wrote:
> > In Python the One Obvious Way is iteration when possible, recursion when
> > necessary.
>
> There's nothing "obvious" about solving the 8 Queens problem using
> iteration. Or walking a binary tree. Or generating all the permutations
> of a list.

*Sigh*  Well, I'm out of this debate.  Apparently it's not possible to
argue that recursivie algorithms should be avoided *sometimes* without
everyone citing cases that obviously aren't from those times (as if I
had been arguing that recursion should be avoided all the time).

Here's a parting thought for you to cite "counterexamples" of:

Iteration should be used instead of recursion anywhere a tail-
recursive algorithm is possible.  Recursion should be used only when
tail-recursion is not possible.


Carl Banks


From pscott at uwc.ac.za  Tue May  5 04:32:38 2009
From: pscott at uwc.ac.za (Paul Scott)
Date: Tue, 05 May 2009 10:32:38 +0200
Subject: Any idea to emulate tail -f
In-Reply-To: <99114d6c-9d12-4b74-9b7c-ce32377a8b61@21g2000vbk.googlegroups.com>
References: <mailman.5091.1241503147.11746.python-list@python.org>
	<99114d6c-9d12-4b74-9b7c-ce32377a8b61@21g2000vbk.googlegroups.com>
Message-ID: <1241512358.6541.16.camel@paul-laptop>

On Mon, 2009-05-04 at 23:50 -0700, CTO wrote:
> You might want to try http://pyinotify.sourceforge.net/. Works well on
> Linux systems. Otherwise, I'd watch the mtime on the file and fork to
> handle the change.
> 

pyinotify works really well. If you need to watch a file, simply use the
IN_MODIFY watch to fire off a notification when the file changes. Then
you can use that event in anything you may need.

I put up some basic pyinotify usage here:
http://www.paulscott.za.net/index.php?module=jabberblog&postid=ps123_2560_1240747637&action=viewsingle but if you need some more help with it, read the docs and then ask me also

-- Paul
http://www.paulscott.za.net
http://twitter.com/paulscott56
http://avoir.uwc.ac.za
-- 



From wolfram.hinderer at googlemail.com  Tue May  5 04:35:17 2009
From: wolfram.hinderer at googlemail.com (wolfram.hinderer at googlemail.com)
Date: Tue, 5 May 2009 01:35:17 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>

On 5 Mai, 08:08, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:

> Self-reflective functions like these are (almost?) unique in Python in
> that they require a known name to work correctly. You can rename a class,
> instance or module and expect it to continue to work, but not so for such
> functions. When editing source code, it is very easy to forget to change
> all the references to the function name within the body of itself
> function, even for small functions, and refactoring tools are overkill.

It is easy to change all references of the function name, except for
those in the function body itself? That needs some explantation.

> It is often useful to create two similar functions, or a variant of a
> function, without duplicating the source code. E.g. you might want a
> function that uses a cache, while still keeping around the version
> without a cache:
>
> cached_function = memoize(function)
>
> Currently, this does not give the expected results for recursive
> functions, nor does it give an error. It simply fails to behave as
> expected. Re-writing function() to use __this__ for the recursive call
> will solve that problem.

Won't __this__ (inside function) still refer to function, not
cached_function?

> Here is a proof-of-concept pure Python implementation, using a decorator,
> and abusing a global variable. This is NOT to imply that `__this__`
> should be a global if this proposal goes ahead.
>
> from functools import wraps
> def make_this(func):
> ? ? global __this__
> ? ? __this__ = func
> ? ? @wraps(func)
> ? ? def f(*args, **kwargs):
> ? ? ? ? return func(*args, **kwargs)
> ? ? return f

This still has the memoizing problem.


From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 04:37:28 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 08:37:28 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
	<f17fd77e-43b9-4d97-ba29-4790def4826d@z7g2000vbh.googlegroups.com>
	<f6d22d90-b1e1-40f2-8647-834163638ce3@v35g2000pro.googlegroups.com>
	<pan.2009.05.05.03.26.14@REMOVE.THIS.cybersource.com.au>
	<04ed259e-01cf-459b-8664-a1dd6a23d60e@d19g2000prh.googlegroups.com>
Message-ID: <pan.2009.05.05.08.37.27@REMOVE.THIS.cybersource.com.au>

On Mon, 04 May 2009 23:55:41 -0700, Carl Banks wrote:

> On May 4, 8:26?pm, Steven D'Aprano
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> On Mon, 04 May 2009 16:33:13 -0700, Carl Banks wrote:
>> > On May 4, 4:06?pm, bearophileH... at lycos.com wrote:
>> >> Carl Banks:
>>
>> >> >1. Singly-linked lists can and should be handled with iteration.<
>>
>> >> I was talking about a binary tree with list-like topology, of
>> >> course.
>>
>> > "(every node has 1 child, and they are chained)"
>>
>> > That's a singly-linked list, not a tree. ?It's a degenerate tree at
>> > best.
>>
>> A singly-linked list is a degenerate tree. Not "at best", but "is".
> 
> No, many implemenations of singly-linked lists aren't trees by any
> definition.

I would say not. Nodes with a single link field can't form a tree, 
because you can't give it a left and right child. However trees can 
degenerate into a singly-linked list, where each node has at least one 
unused child. That is what both Bearophile and I are trying to tell you. 
It's not that anyone sane thinks "I know, I'll use a binary tree to 
implement a linked list" -- that would be stupid, and shame on you for 
thinking that Bearophile is that stupid. But if you insert data into a 
non-self-balancing tree, sometimes the tree will degenerate into a linked 
list with extra, unused child links.


[...]
> But even singly-linked lists implemented with cons cells can be handled,
> and are better handled, with interation.

Can be, certainly.

Better? Maybe.


>> >> >All recursion does it make what you're doing a lot less readable
>> >> >for almost all programmers.<
>>
>> >> I can't agree.
>>
>> > If every child has one node you don't need recursion.
>>
>> And if one single node in the entire tree has two children, you do.
> 
> Then it't not a singly-linked list.  It's a tree.

It was already a tree. It's just that the entire tree happened to form 
one long chain.



>> What
>> are you suggesting, that Bearophile should write his tree-processing
>> code to only deal with the degenerate case?
> 
> I'm suggesting that Bearophile should write recursive code for his trees
> and iterative code for his lists.

But his tree-handling recursive code MUST and WILL operate on degenerate 
trees that form chains (linked lists), unless he writes more complicated 
code to avoid it (e.g. red-black trees). For simple trees, you don't have 
the luxury of saying "Oh, my trees will never be degenerate, they'll 
always be optimal, with the minimum depth possible." You get the trees 
you're given, and sometimes they'll be one long branch with no, or very 
fewer, off-shoots, and you'll have O(N) performance instead of O(log N).

And the clever thing?

Just write the recursive code, as normal, and it will magically handle 
the degenerate case too.



>> >> If the data structure is recursive (like a tree, or even sometimes
>> >> graphs, etc) a recursive algorithm is shorter, more readable and
>> >> more natural.
>>
>> > Because that's a tree, not a linked-list.
>>
>> And a linked list is a degenerate tree. If you have a
>> non-self-balancing tree, sometimes it will be degenerate, and your code
>> needs to deal with it.
> 
> If you have a tree, then you use recursive code.  If you have a list you
> use iterative code.

I wish to retract my poorly worded comment "And a linked list is a 
degenerate tree". That is incorrect. What I should have said is that a 
degenerate tree behaves equivalently to a linked list, rather than "is".



>> > Which is germane because Python's recursion limit is the thing you're
>> > complaining about here, and you don't normally hit that limit with
>> > real trees because they rarely go 1000 deep.
>>
>> And if just ONE branch of the tree goes 1000 deep, even if the rest of
>> the tree is shallow, then you hit the default recursion limit.
> 
> Yeah, well, see that's just the point here.  Bearophile was asked if any
> of his trees go 1000 deep, he said yes, his singly-linked lists do. 

He certainly did not say anything of the sort.


> Well, I'm sorry, that's not going to convince me, because bearophile
> should be using iteration for the singly-linked lists.

What Bearophile actually wrote was:

"You are thinking just about complete binary trees. But consider that a 
topology LIKE a single linked list (every node has 1 child, and they are 
chained) is a true binary tree still." [Emphasis added.]

It should be obvious what he means. But if, by some chance, you 
misunderstood what he said, he replied to your earlier post and explained 
further:

"I was talking about a binary tree with list-like topology, of course."

If you don't understand what a binary-tree with a list-like topology is, 
then I respectfully suggest that you are unqualified to have an opinion 
in this discussion and you should come back when you've learned what a 
binary-tree with a list-like topology actually is, and why your 
suggestion that he use iteration on linked lists is, to quote Wolfgang 
Pauli, Not Even Wrong.


> Bearophile might very well have real trees that are 1000 deep, but
> that's not going to convince me either, because IMO real trees rarely do
> that, and Python's recursion limit can be increased in the rare cases
> they do.

Are you saying that Bearophile's trees are imaginary? That's he's making 
them up?

Personally, I don't think it's good to have a function fail just because 
it has to recurse over a mere 1000 items. I think that's as poor as some 
hypothetical language where you can't iterate over more than 1000 items, 
and if you try, you have to catch the exception, increase the iteration 
limit, and try again. People wouldn't stand for it.

Oh, I understand *why* Python has that limitation. It's just a black mark 
on an otherwise wonderful language.


[...]
>> > Singly-linked lists don't count because you don't need recursion for
>> > them.
>>
>> If each node has two (or more) child fields, even if only one of those
>> children is non-empty, then your data structure is a degenerate tree
>> and does count.
> 
> If one of the fields is always empty, you don't need recursion to deal
> with it.

That's just silly. How do you know that one of the fields is always empty 
until you've walked the tree?



[...]
> I'm not talking about degenerate trees.  I'm talking about singly-
> linked lists, which you DO NOT NEED, and SHOULD NOT USE, recursion to
> deal with.

Ah, then you are the one introducing the straw man, because Bearophile is 
talking about trees.



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 04:46:41 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 08:46:41 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
	<pan.2009.05.05.03.22.33@REMOVE.THIS.cybersource.com.au>
	<37e0021f-b50c-4f0c-8ba5-0beed01da029@z16g2000prd.googlegroups.com>
	<pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>
	<5a8c7e8b-8b3d-4a47-9ac6-23bc85b512f4@d7g2000prl.googlegroups.com>
Message-ID: <pan.2009.05.05.08.46.40@REMOVE.THIS.cybersource.com.au>

On Tue, 05 May 2009 01:25:49 -0700, Carl Banks wrote:

> *Sigh*  Well, I'm out of this debate.  Apparently it's not possible to
> argue that recursivie algorithms should be avoided *sometimes* without
> everyone citing cases that obviously aren't from those times (as if I
> had been arguing that recursion should be avoided all the time).

You overstated your position, and then instead of gracefully admitting 
that you overstated it, you're trying to weasel out of it by acting the 
victim. If all you had said was that "sometimes" recursion should be 
avoided, then who could argue against that? Scheme purists? Pah, this is 
Python, we don't need no stinkin' mathematical purity!

Practicality beats purity is *precisely* why sometimes you need recursion 
instead of forcing a complicated iterative solution onto a simple 
recursive problem.


> Here's a parting thought for you to cite "counterexamples" of:
> 
> Iteration should be used instead of recursion anywhere a tail- recursive
> algorithm is possible. Recursion should be used only when
> tail-recursion is not possible.

Or when the recursive algorithm is simpler than the iterative algorithm, 
and you don't care about squeezing out every last tiny micro-optimization 
into the code.



-- 
Steven


From sri_annauni at yahoo.co.in  Tue May  5 05:11:28 2009
From: sri_annauni at yahoo.co.in (srinivasan srinivas)
Date: Tue, 5 May 2009 14:41:28 +0530 (IST)
Subject: Which one is best Python or Java for developing GUI applications?
In-Reply-To: <49ffecbf$0$27576$426a74cc@news.free.fr>
References: <mailman.5092.1241505670.11746.python-list@python.org>
	<7xfxfkvwra.fsf@ruckus.brouhaha.com>
	<49ffecbf$0$27576$426a74cc@news.free.fr>
Message-ID: <629374.1103.qm@web7904.mail.in.yahoo.com>


Could you list down those advantages??



----- Original Message ----
From: Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>
To: python-list at python.org
Sent: Tuesday, 5 May, 2009 1:07:41 PM
Subject: Re: Which one is best Python or Java for developing GUI applications?

Paul Rubin a ?crit :
> srinivasan srinivas <sri_annauni at yahoo.co.in> writes:
>> Could you tell me does Python have any advantages over Java for the development of GUI applications?
> 
> Yes.

Indeed.
--
http://mail.python.org/mailman/listinfo/python-list



      Cricket on your mind? Visit the ultimate cricket website. Enter http://beta.cricket.yahoo.com


From umut.tabak at gmail.com  Tue May  5 05:21:27 2009
From: umut.tabak at gmail.com (utab)
Date: Tue, 5 May 2009 02:21:27 -0700 (PDT)
Subject: change some lines from a read file
References: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
	<mailman.5061.1241467868.11746.python-list@python.org>
Message-ID: <9cf75556-a58c-4079-b457-da88b0370a1d@s16g2000vbp.googlegroups.com>

On May 4, 10:06?pm, Anthra Norell <anthra.nor... at bluewin.ch> wrote:
> utab wrote:
> > Dear all,
>
> > I have to change some lines from a template file, which is rather long
> > to paste here, but I would like to make some parts of some lines
> > optional with my command line arguments but I could not see this
> > directly, I can count the line numbers and decide on this basis to
> > decide the lines to be configured to my will.
>
> > More specifically, say, I have a that file includes
>
> > this is an example python file to play around
> > .
> > .
> > .
> > some lines
> > .
> > .
> > .
> > . -> an option line for example.
> > .
> > .
> > .
> > -> another option line so on.
>
> > and execute the script
> > ./myScript option1 option2
>
> > so that the options at correct locations will be written.
>
> > Any other options for this simple job that i can improve my Python a
> > bit as well.
>
> > Best,
> > Umut
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> Your description is not explicit enough to convey your intention. If
> your template file is too long to post, post a short representative
> section, an input data sample and a hand-edited sample of the output
> data you want to generate. You will get more and better advice. .
>
> Frederic

Thanks here is a  sample Session file from a commercial finite element
pre-post processor PATRAN, the file longer but the ideas are the same
so that let me give an example, say I would like to make write line 10
composed of some command line arguments: path+database_name, Also
there are some lines similar to this in the below sections of the
file. I am doing it with a if-elif-else clause checking the line
numbers with which I thought of there should be a better way and ended
up asking...

     1 $# Session file patran.ses.02 started recording at 05-May-09
11:12:25
     2 $# Build: 15.0.038 Mon Aug 20 21:31:45 PDT 2007
     3 $# Recorded by: Patran 2007 r1b
     4 $# FLEXlm initialization complete.  Acquiring license(s)...
     5 $# License File: /opt/patran-2007r1b/license.dat
     6 $# Patran 2007 r1b has obtained 1 concurrent license(s) from
FLEXlm per a
     7 $# request to execute on Linux node hpc06(001e4f20c494) (Linux
     8 $# 2.6.23.15-80.fc7) at 05-May-09 11:12:25.
     9 uil_file_new.go( "/opt/patran-2007r1b/template.db",  @
    10 "/home/utabak/PATRAN/cavityModels/fromGmsh.db" )
    11 $# Question from application FILE
    12 $#     Database /home/utabak/PATRAN/cavityModels/fromGmsh.db
already exists.
    13 $# Do you wish to delete the existing database and create a new
one ?
    14 $? YES 36000002
    15 $# Copying /opt/patran-2007r1b/template.db to
    16 $# /home/utabak/PATRAN/cavityModels/fromGmsh.db
    17 $# Template copy complete.
    18 $# Database version 3.8 created by Patran 2007 r1b successfully
opened.
    19 ga_viewport_size_set( "default_viewport", 14.571214, 7.509466,
1 )
    20 ga_viewport_location_set( "default_viewport", 0.000000,
1.088771, 1 )
    21 $# Creating journal file /home/utabak/PATRAN/cavityModels/
fromGmsh.db.jou at
    22 $# 05-May-09 11:12:43
    23 nastran_input_import( "/home/utabak/PATRAN/cavityModels/
toPatran.bdf",  @
    24 "default_group", 10, [TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE,
TRUE, FALSE,  @
    25 TRUE], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0,
0, 0], [ @
    26 -2000000000, -2000000000, -2000000000, -2000000000,
-2000000000, -2000000000,  @
    27 -2000000000, -2000000000, 0, 0] )
    28 $# Reading of MSC.Nastran input file completed.
    29 ui_exec_function( "mesh_seed_display_mgr", "init" )

Best,


From clp2 at rebertia.com  Tue May  5 05:28:15 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 5 May 2009 02:28:15 -0700
Subject: Which one is best Python or Java for developing GUI applications?
In-Reply-To: <87d4ao9fi7.fsf@rudin.co.uk>
References: <mailman.5092.1241505670.11746.python-list@python.org>
	<7xfxfkvwra.fsf@ruckus.brouhaha.com> <87d4ao9fi7.fsf@rudin.co.uk>
Message-ID: <50697b2c0905050228l5fee0351re35f61f0fe9d35ab@mail.gmail.com>

On Tue, May 5, 2009 at 12:26 AM, Paul Rudin <paul.nospam at rudin.co.uk> wrote:
> Paul Rubin <http://phr.cx at NOSPAM.invalid> writes:
>
>> srinivasan srinivas <sri_annauni at yahoo.co.in> writes:
>>> Could you tell me does Python have any advantages over Java for the
>>> development of GUI applications?
>>
>> Yes.
>
> Clearly c.l.p needs to adopt the SNB <http://cam.misc.org.uk/snb>
> convention :)

Surely you have forgotten the comedy style of the language's namesake,
which makes that rule completely inadmissible! ;P

Cheers,
Chris
-- 
http://blog.rebertia.com


From ldo at geek-central.gen.new_zealand  Tue May  5 05:46:38 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 05 May 2009 21:46:38 +1200
Subject: Any idea to emulate tail -f
References: <mailman.5091.1241503147.11746.python-list@python.org>
Message-ID: <gtp1tu$rv1$3@lust.ihug.co.nz>

In message <mailman.5091.1241503147.11746.python-list at python.org>, Joel 
Juvenal Rivera Rivera wrote:

> I want to make something very similar to  the command tail -f (follow a
> file) ...

<http://codecodex.com/wiki/index.php?title=Monitoring_a_Log_File>



From QJing.Li at gmail.com  Tue May  5 06:05:51 2009
From: QJing.Li at gmail.com (Leon)
Date: Tue, 5 May 2009 03:05:51 -0700 (PDT)
Subject: what's the best way to call a method of object without a guarantee of
	its existence
Message-ID: <22690572-e338-483a-a99a-85ccf6c5fae6@x6g2000vbg.googlegroups.com>

One way,  define the object before it is used,
like this:
object = None
.....
.....

if object is not None:
   object.method()

The other way, using try ... catch
try:
     object.method()
catch NameError:
     pass

for  big programs, which is better, or any other way?

Miles




From grflanagan at gmail.com  Tue May  5 06:22:43 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Tue, 05 May 2009 11:22:43 +0100
Subject: find sublist inside list
In-Reply-To: <gtmlsk$q51$1@amma.irisa.fr>
References: <gtmlsk$q51$1@amma.irisa.fr>
Message-ID: <gtp41k$mvb$1@ger.gmane.org>

Matthias Gall? wrote:
> Hi.
> 
> My problem is to replace all occurrences of a sublist with a new element.
> 
> Example:
> Given ['a','c','a','c','c','g','a','c'] I want to replace all 
> occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).
> 

For novelty value:

from itertools import izip

def replace2(data, pattern):
     assert len(pattern) == 2
     pattern = tuple(pattern)
     icopy = iter(data)
     icopy.next()
     gen = izip(data, icopy)
     while True:
         item = gen.next()
         if item == pattern:
             yield '6'
             gen.next()
         else:
             yield item[0]

# works if list ends with ['a', 'c']
data = ['g', 'a', 'c', 'a', 'c', 'a', 'a', 'a', 'g', 'a', 'c']
want = 'g66aaag6'
assert ''.join(replace2(data, ['a', 'c'])) == want

# otherwise you lose the last element of the tail
data = ['g', 'a', 'c', 'a', 'c', 'a', 'a', 'a', 'g', 'a', 'c', 'c', 'g']
want = 'g66aaag6cg'
get = 'g66aaag6c'
assert not ''.join(replace2(data, ['a', 'c'])) == want
assert ''.join(replace2(data, ['a', 'c'])) == get

# fix by adding the pattern to the end of the data as a sentinel

def replace2(data, pattern):
     assert len(pattern) == 2
     def _replace2(data, pattern):
         pattern = tuple(pattern)
         icopy = iter(data)
         icopy.next()
         gen = izip(data, icopy)
         while True:
             item = gen.next()
             if item == pattern:
                 yield '6'
                 gen.next()
             else:
                 yield item[0]
     data = data + pattern
     return list(_replace2(data, pattern))[:-1]

data = ['g', 'a', 'c', 'a', 'c', 'a', 'a', 'a', 'g', 'a', 'c']
want = 'g66aaag6'
assert ''.join(replace2(data, ['a', 'c'])) == want

data = ['g', 'a', 'c', 'a', 'c', 'a', 'a', 'a', 'g', 'a', 'c', 'c', 'g']
want = 'g66aaag6cg'
assert ''.join(replace2(data, ['a', 'c'])) == want

print 'done'



From iainking at gmail.com  Tue May  5 06:24:29 2009
From: iainking at gmail.com (Iain King)
Date: Tue, 5 May 2009 03:24:29 -0700 (PDT)
Subject: Any idea to emulate tail -f
References: <mailman.5091.1241503147.11746.python-list@python.org>
Message-ID: <55f6d122-187f-4796-8162-78b066875c4d@q14g2000vbn.googlegroups.com>

On May 5, 7:00?am, Joel Juvenal Rivera Rivera <joel... at gmail.com>
wrote:
> I want to make something very similar to ?the command tail -f (follow a
> file), i have been trying ?with some while True and some microsleeps
> (about .1 s); did someone has already done something like this?
>
> And about the file is the apache acceslog ?of a site with a lot of
> traffic.
>
> Regards ? ?
>
> joe / Joel Rivera

This is very interesting, about using Generator Expressions:
http://209.85.229.132/search?q=cache:ZHrV4E0eTI8J:www.dabeaz.com/generators/Generators.pdf

Relevant stuff about 'tail -f' is on page 39, but I'd read the whole
thing if you can.

Iain


From marco at sferacarta.com  Tue May  5 06:25:08 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Tue, 05 May 2009 12:25:08 +0200
Subject: what's the best way to call a method of object without a guarantee
	of  its existence
In-Reply-To: <22690572-e338-483a-a99a-85ccf6c5fae6@x6g2000vbg.googlegroups.com>
References: <22690572-e338-483a-a99a-85ccf6c5fae6@x6g2000vbg.googlegroups.com>
Message-ID: <9uULl.4199$Ux.2825@tornado.fastwebnet.it>

Leon wrote:

> One way,  define the object before it is used,
> like this:
> object = None

This is a good practice anyway. Conditional existance of objects is 
quite evil. Resorting to if defined('foo') is double-plus-ugly.


> The other way, using try ... catch
> try:
>      object.method()
> catch NameError:
>      pass

Except you should trap AttributeError because you defined the thing as 
None before. NameErrors should be fixed as bugs, not trapped (IMHO -- 
but in python there is always a use case for everything).

Keep in mind that AttributeError might come from inside the method(), 
which could be confusing

By using the

if stuff:
    stuff.run()

idiom, you avoid the last issue and keep it simple enough.


> for  big programs, which is better, or any other way?

Define "big", as in scope, LOCs, or number of committers?



From jsanga at cox.net  Tue May  5 06:26:45 2009
From: jsanga at cox.net (mzdude)
Date: Tue, 5 May 2009 03:26:45 -0700 (PDT)
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
	<mailman.5041.1241442097.11746.python-list@python.org> 
	<c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com> 
	<gtmsf0$se7$1@amma.irisa.fr>
	<b1f47eb5-22a6-491c-b6db-bda94c934b23@l28g2000vba.googlegroups.com>
	<mailman.5071.1241474085.11746.python-list@python.org>
Message-ID: <87859e88-315f-47e3-98b9-338709d4c044@s28g2000vbp.googlegroups.com>

On May 4, 4:54?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Mon, 04 May 2009 15:12:41 -0300, mzdude <jsa... at cox.net> escribi?:
>
> > substring isn't limited to 0..255
> >>>> substring = "\0x%d\0x%d" % (257,257)
> >>>> 'acaccgac'.replace("ac", substring)
> > '\x00x257\x00x257\x00x257\x00x257cg\x00x257\x00x257'
>
> This isn't what you think it is. Look carefully:
>
> py> substring = "\0x%d\0x%d" % (257,257)
> py> len(substring)
> 10
> py> list(substring)
> ['\x00', 'x', '2', '5', '7', '\x00', 'x', '2', '5', '7']
>
> --
> Gabriel Genellina

OOPS. My bad. But I'm not going to give up.

l = ['a','b','c','a','c']
us = unicode("".join(l))
substr = unichr(257) + unichr(257)
us = us.replace(u'ac',substr)
print len(us)
print list(us)


output is
>>>
5
[u'a', u'b', u'c', u'\u0101', u'\u0101']


From aleksandar27 at BRISIOVOnet.hr  Tue May  5 07:21:10 2009
From: aleksandar27 at BRISIOVOnet.hr (alejandro)
Date: Tue, 5 May 2009 13:21:10 +0200
Subject: stuck with PyOBEX
References: <gt78o7$i9n$1@ss408.t-com.hr> <75opebF19fc22U1@mid.uni-berlin.de>
	<gt80qd$mbf$1@get-news01.get.basefarm.net>
	<gt8pbj$j3o$1@ss408.t-com.hr>
	<gtatk5$pff$1@get-news01.get.basefarm.net>
	<gthe40$87q$1@ss408.t-com.hr>
	<gthm2m$sdr$1@get-news01.get.basefarm.net>
	<gtjktg$ai0$1@ss408.t-com.hr>
	<gtkhdr$obj$1@get-news01.get.basefarm.net>
Message-ID: <gtp7fd$cu5$1@ss408.t-com.hr>

Ejla! I have sent you a mail (in case you check it often like me :-))

"David Boddie" <david at boddie.org.uk> wrote in message 
news:gtkhdr$obj$1 at get-news01.get.basefarm.net...
> On Sunday 03 May 2009 10:33, alejandro wrote:
>
>> Yes!
>>
>>> I'll send you an updated version to try if you would like to test it.
>
> My mails to you keep getting returned, so I've put it here:
>
> http://www.boddie.org.uk/david/Projects/Python/PyOBEX/Software/PyOBEX-0.21.zip
>
> Please let me know if it works on Windows, and feel free to get in touch 
> if
> you have any problems.
>
> David 




From ldo at geek-central.gen.new_zealand  Tue May  5 07:28:16 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 05 May 2009 23:28:16 +1200
Subject: exit a program gracefully
References: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
	<50697b2c0905041514t22ac9436td0dbe51e0f22dcfa@mail.gmail.com>
	<mailman.5079.1241476454.11746.python-list@python.org>
Message-ID: <gtp7sg$vbc$1@lust.ihug.co.nz>

In message <mailman.5079.1241476454.11746.python-list at python.org>, Gabriel 
Genellina wrote:

> I prefer to put the code inside a function, and just `return` earlier.

It would be nice if Python offered a straightforward equivalent to

    ... initialization goes here ...
    do /*once*/
      {
        ... do stuff ...
        if (check1_failed)
            break;
        ... do more stuff ...
        if (check2_failed)
            break;
        ... do even more stuff ...
      }
    while (false);
    ... cleanup goes here ...




From cs at zip.com.au  Tue May  5 07:42:00 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Tue, 5 May 2009 21:42:00 +1000
Subject: exit a program gracefully
In-Reply-To: <gtp7sg$vbc$1@lust.ihug.co.nz>
Message-ID: <20090505114200.GA11906@cskk.homeip.net>

On 05May2009 23:28, Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
| In message <mailman.5079.1241476454.11746.python-list at python.org>, Gabriel 
| Genellina wrote:
| 
| > I prefer to put the code inside a function, and just `return` earlier.
| 
| It would be nice if Python offered a straightforward equivalent to
| 
|     ... initialization goes here ...
|     do /*once*/
|       {
|         ... do stuff ...
|         if (check1_failed)
|             break;
|         ... do more stuff ...
|         if (check2_failed)
|             break;
|         ... do even more stuff ...
|       }
|     while (false);
|     ... cleanup goes here ...

  while True:
    ... do stuff ...
    if check1_failed:
      break;
    ... do more stuff ...
    if check2_failed:
      break;
    ... do even more stuff ...
    break
  ... cleanup goes here ...

Seems more straightforward to me!

And there's always try/except and context managers.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

So why can't we celebrate November 5th the way Guy Fawkes would've wanted?
        - Mike Holmes <fofp at tattoo.ed.ac.uk>


From tomanishkb at gmail.com  Tue May  5 08:10:13 2009
From: tomanishkb at gmail.com (M Kumar)
Date: Tue, 5 May 2009 17:40:13 +0530
Subject: help required with pylons
Message-ID: <783b47270905050510y7f899a70s1b79bb3965d44f32@mail.gmail.com>

Hi,

I am having an application server in pylons, which was giving error
sometimes and sometimes it gives the result. I will copy paste the error
below. I am new to pylons and not getting any clue of this kind of behavior.
Please help me what should I do to avoid this kind of errors.

----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 33021)
Traceback (most recent call last):
  File
"/usr/lib/python2.5/site-packages/Paste-1.4.2-py2.5.egg/paste/httpserver.py",
line 1046, in process_request_in_thread
    self.finish_request(request, client_address)
  File "/usr/lib/python2.5/SocketServer.py", line 254, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/lib/python2.5/SocketServer.py", line 522, in __init__
    self.handle()
  File
"/usr/lib/python2.5/site-packages/Paste-1.4.2-py2.5.egg/paste/httpserver.py",
line 425, in handle
    BaseHTTPRequestHandler.handle(self)
  File "/usr/lib/python2.5/BaseHTTPServer.py", line 316, in handle
    self.handle_one_request()
  File
"/usr/lib/python2.5/site-packages/Paste-1.4.2-py2.5.egg/paste/httpserver.py",
line 420, in handle_one_request
    self.wsgi_execute()
  File
"/usr/lib/python2.5/site-packages/Paste-1.4.2-py2.5.egg/paste/httpserver.py",
line 287, in wsgi_execute
    self.wsgi_start_response)
  File
"/usr/lib/python2.5/site-packages/Paste-1.4.2-py2.5.egg/paste/cascade.py",
line 92, in __call__
    return self.apps[-1](environ, start_response)
  File
"/usr/lib/python2.5/site-packages/Paste-1.4.2-py2.5.egg/paste/registry.py",
line 340, in __call__
    app_iter = self.application(environ, start_response)
  File
"/usr/lib/python2.5/site-packages/AuthKit-0.4.0-py2.5.egg/authkit/authenticate/__init__.py",
line 290, in __call__
    return self.app(environ, start_response)
  File
"/usr/lib/python2.5/site-packages/AuthKit-0.4.0-py2.5.egg/authkit/authenticate/cookie.py",
line 354, in __call__
    return self.app(environ, cookie_setting_start_response)
  File
"/usr/lib/python2.5/site-packages/AuthKit-0.4.0-py2.5.egg/authkit/authenticate/multi.py",
line 64, in __call__
    raise Exception('WSGI start_response was not called before a result'
Exception: WSGI start_response was not called before a result was returned
----------------------------------------
thanks in advance
Maneesh KB
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From damienlmoore at gmail.com  Tue May  5 08:18:57 2009
From: damienlmoore at gmail.com (spillz)
Date: Tue, 5 May 2009 05:18:57 -0700 (PDT)
Subject: Problem with case insensitive volumes
References: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
	<mailman.5088.1241498014.11746.python-list@python.org>
Message-ID: <26c57bf5-5ad2-4838-8097-c8d51cf1ccae@n8g2000vbb.googlegroups.com>

> os;walk will tell you the correct case for each node. ? So if it gives
> you a different case than the stored form, you have your answer.

Thanks, although I was hoping that wouldn't be the answer (I have to
compare a LOT of files).


From ganesh.gbg at gmail.com  Tue May  5 08:29:13 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Tue, 5 May 2009 05:29:13 -0700 (PDT)
Subject: problem in using sendmail in multi thread
Message-ID: <343747e9-549f-4336-9b15-522411a785a3@x1g2000prh.googlegroups.com>

hi,
I'm a beginner in using Python script
I'm trying to send mails using multi-thread
I wrote



FROM = 'ganeshxxxx at xxxx.com'
# for more mail add';' the another mail id
listTo = ['g.xxx at gmail.com', 'xxjango.py at gmail.com',
'xxxxx at yahoo.co.in']
SUBJECT = 'This is the subject'
MSGBODY = 'This the body of the message '
MAILSERVER = 'mail.xxxx.com'
port = 25
username = 'xxxxx'
password = 'xxxxx'

# trim the strings of any leading or trailing spaces
FROM = FROM.strip()
SUBJECT = SUBJECT.strip()
MSGBODY = MSGBODY.strip()
MAILSERVER = MAILSERVER.strip()
username = username.strip()
password = password.strip()



#Connect to server
print 'Connecting to mail server ', MAILSERVER
try:
	s = smtplib.SMTP(MAILSERVER,port)
	print 'connected'
#s.set_debuglevel(1)
except:
	 print 'ERROR: Unable to connect to mail server', sys.exc_info	()[0]
	 sys.exit(1)

#login to server
if password <> '':
	print 'Logging into mail server'
try:
	s.login(username,password)
except:
	print 'ERROR: Unable to login to mail server', MAILSERVER
	print 'Please recheck your password'
	sys.exit(1)

#--------------------------------------------------
print "Starting Multi Thread Method"


class MyThread(Thread):

    def __init__(self, site, s, FROM, MSGBODY):
        Thread.__init__(self)
        self.site = site
	self.s=s
	self.FROM=FROM
	self.MSGBODY=MSGBODY

    def run(self):
	print "running for %s " %self.site
	s.sendmail(self.FROM, self.site, self.MSGBODY)
	print "Emailed for  site %s" %self.site



a= time.time()
threads = []

for site in listTo:
    T = MyThread(site,s,FROM,MSGBODY)
    threads.append(T)
    T.start()


for i in threads:
    i.join()
s.quit()
s.close()
print "Took %s seconds" %str(time.time()-a)

#-----------------------------------------------------

Error:
There is no problem with mail ids
I'm using python2.5 ,Ubuntu
I got an error like



Traceback (most recent call last):
  File "/usr/lib/python2.5/threading.py", line 486, in
__bootstrap_inner
    self.run()
  File "threadmailmul.py", line 85, in run
    s.sendmail(self.FROM, self.site, self.MSGBODY)
  File "/usr/lib/python2.5/smtplib.py", line 703, in sendmail
    raise SMTPRecipientsRefused(senderrs)
SMTPRecipientsRefused: {'g.xxx at gmail.com': (503, '5.5.1 Error: nested
MAIL command')}

Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib/python2.5/threading.py", line 486, in
__bootstrap_inner
    self.run()
  File "threadmailmul.py", line 85, in run
    s.sendmail(self.FROM, self.site, self.MSGBODY)
  File "/usr/lib/python2.5/smtplib.py", line 704, in sendmail
    (code,resp) = self.data(msg)
  File "/usr/lib/python2.5/smtplib.py", line 487, in data
    raise SMTPDataError(code,repl)
SMTPDataError: (503, '5.5.1 Error: need MAIL command')

Exception in thread Thread-3:
Traceback (most recent call last):
  File "/usr/lib/python2.5/threading.py", line 486, in
__bootstrap_inner
    self.run()
  File "threadmailmul.py", line 85, in run
    s.sendmail(self.FROM, self.site, self.MSGBODY)
  File "/usr/lib/python2.5/smtplib.py", line 692, in sendmail
    raise SMTPSenderRefused(code, resp, from_addr)
SMTPSenderRefused: (503, '5.5.1 Error: need RCPT command',
'ganeshxxxx at xxx.com')

Exception in thread Thread-4:
Traceback (most recent call last):
  File "/usr/lib/python2.5/threading.py", line 486, in
__bootstrap_inner
    self.run()
  File "threadmailmul.py", line 85, in run
    s.sendmail(self.FROM, self.site, self.MSGBODY)
  File "/usr/lib/python2.5/smtplib.py", line 702, in sendmail
    self.rset()
  File "/usr/lib/python2.5/smtplib.py", line 453, in rset
    return self.docmd("rset")
  File "/usr/lib/python2.5/smtplib.py", line 378, in docmd
    return self.getreply()
  File "/usr/lib/python2.5/smtplib.py", line 355, in getreply
    raise SMTPServerDisconnected("Connection unexpectedly closed")
SMTPServerDisconnected: Connection unexpectedly closed

Traceback (most recent call last):
  File "threadmailmul.py", line 102, in <module>
    i.join()
  File "/usr/lib/python2.5/threading.py", line 594, in join
    self.__block.wait()
  File "/usr/lib/python2.5/threading.py", line 216, in wait
    waiter.acquire()


If someone could point out the (probably silly)
mistake I'm making , I would be very grateful.
Thanks in advance


From kyrie at uh.cu  Tue May  5 08:33:01 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Tue, 5 May 2009 08:33:01 -0400
Subject: Self function
In-Reply-To: <50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com>
Message-ID: <200905050833.01211.kyrie@uh.cu>

On Tuesday 05 May 2009 02:46:58 am Chris Rebert wrote:
> <devils_advocate>
> Adding syntax is EVIL(tm) for it angers the Gods of Backwards
> Compatibility, and this proposal is completely unnecessary because you
> could instead just write:
[...]
> And there would be much clashing with existing variable names,
> for keywords are the Devil's work!
> </devils_advocate>

Heh. I liked the proposal (though I'm not 100% sold on the name __this__), and 
one of the reasons I liked it was... it preempted the name-clashing argument. 
Not a new keyword, just a variable that is injected on the local namespace, 
so it would only clash with code that uses __this__ as a global (or that 
expects to use an unbound __this__).

Btw, is there any way to inject a name into a function's namespace? Following 
the python tradition, maybe we should try to create a more general solution!

K.

(P.S: there is one advantage on having it as a keyword, though: it would make 
static analisis easier)

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From kyrie at uh.cu  Tue May  5 08:44:24 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Tue, 5 May 2009 08:44:24 -0400
Subject: Self function
In-Reply-To: <pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<37e0021f-b50c-4f0c-8ba5-0beed01da029@z16g2000prd.googlegroups.com>
	<pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>
Message-ID: <200905050844.24207.kyrie@uh.cu>

On Tuesday 05 May 2009 03:51:19 am Steven D'Aprano wrote:
> def ivisit(node):
> ? ? print node
> ? ? while node and node.link is not None:
> ? ? ? ? node = node.link
> ? ? ? ? print node
>
> def rvisit(node):
> ? ? print node
> ? ? if node and node.link is not None:
> ? ? ? ? rvisit(node.link)
>
>
> If there are programmers who find rvisit "a lot less readable" than
> ivisit, then in my arrogant opinion they should consider a change of
> profession.

/me smiles.

What if I happen to find rvisit _more_ readable than ivisit?

/me ducks.

[I'm not a lisp user, but I tend to think recursively anyway...]

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From kyrie at uh.cu  Tue May  5 08:57:17 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Tue, 5 May 2009 08:57:17 -0400
Subject: Self function
In-Reply-To: <5a8c7e8b-8b3d-4a47-9ac6-23bc85b512f4@d7g2000prl.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>
	<5a8c7e8b-8b3d-4a47-9ac6-23bc85b512f4@d7g2000prl.googlegroups.com>
Message-ID: <200905050857.17904.kyrie@uh.cu>

On Tuesday 05 May 2009 04:25:49 am Carl Banks wrote:
> Iteration should be used instead of recursion anywhere a tail-
> recursive algorithm is possible. ?Recursion should be used only when
> tail-recursion is not possible.

Why?
Is it because most languages suck at recursion (specially python, as this 
thread shows)? If that's the reason, I think you have it backwards... Turning 
a tail-recursion into an iteration should be the compiler's job, not mine.

An algorithm, any algorithm, should be written in the way that is easier to 
read, unless the language wont allow that easier implementation to be 
efficient enough.

Programming languages suck, but that shouldn't mean that we can't hope to 
improve them.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From henning.vonbargen at arcor.de  Tue May  5 09:16:38 2009
From: henning.vonbargen at arcor.de (henning.vonbargen at arcor.de)
Date: Tue, 5 May 2009 06:16:38 -0700 (PDT)
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
Message-ID: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>

Our program that makes use of cx_Oracle and multi-threading (and works
fine on Windows, Linux and other platforms, including HP-UX PA-RISC),
fails to run on HP-UX Itanium.
When trying to start the first daemon thread, the program raises an
exception:
...
  File "/usr/local/lib/python2.6/threading.py", line 471, in start
    _start_new_thread(self.__bootstrap, ())
error: can't start new thread

I guess there's something wrong with the way we built Python, but I
have absolutely no clue what (I'm not too familiar with HP-UX).
>From what I found in the internet, it's probably something about the
threading libraries at the C level.

So the question is:
Which steps are necessary to build Python 2.6.2 (32bit or 64bit) on HP-
UX Itanium 11.31 with working multi-threading support?

Note:
For whatever reasons, in order to get cx_Oracle 5.0.1 to work on HP-
UX, I have to build it as a built-in module. That's why I have to
build Python myself (and unfortunately there's no Python 2.6.2 binary
distribution for HP-UX itanium available). Everything works fine
except multi-threading.

Before running configure and make, I set up the environment like this:
export PATH=$PATH:/usr/local/bin
export CPPFLAGS=-I/opt/openssl/0.9.8/include
export LDFLAGS="-L/usr/lib/hpux32 -L/usr/local/lib/hpux32 -L/opt/
openssl/0.9.8/lib"

I have the files generated by configure and make available, but it's
too much to post it all, as as I don't know what is relevant and what
not.
So, here's just the first few lines of the config.log output:

This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

It was created by python configure 2.6, which was
generated by GNU Autoconf 2.61.  Invocation command line was

  $ ./configure --with-zlib --with-openssl

## --------- ##
## Platform. ##
## --------- ##

hostname = polref4
uname -m = ia64
uname -r = B.11.31
uname -s = HP-UX
uname -v = U


From anthra.norell at bluewin.ch  Tue May  5 09:21:48 2009
From: anthra.norell at bluewin.ch (Anthra Norell)
Date: Tue, 05 May 2009 15:21:48 +0200
Subject: change some lines from a read file
In-Reply-To: <9cf75556-a58c-4079-b457-da88b0370a1d@s16g2000vbp.googlegroups.com>
References: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>	<mailman.5061.1241467868.11746.python-list@python.org>
	<9cf75556-a58c-4079-b457-da88b0370a1d@s16g2000vbp.googlegroups.com>
Message-ID: <4A003D6C.1090104@bluewin.ch>

utab wrote:
> On May 4, 10:06 pm, Anthra Norell <anthra.nor... at bluewin.ch> wrote:
>   
>> utab wrote:
>>     
>>> Dear all,
>>>       
>>> I have to change some lines from a template file, which is rather long
>>> to paste here, but I would like to make some parts of some lines
>>> optional with my command line arguments but I could not see this
>>> directly, I can count the line numbers and decide on this basis to
>>> decide the lines to be configured to my will.
>>>       
>>> More specifically, say, I have a that file includes
>>>       
>>> this is an example python file to play around
>>> .
>>> .
>>> .
>>> some lines
>>> .
>>> .
>>> .
>>> . -> an option line for example.
>>> .
>>> .
>>> .
>>> -> another option line so on.
>>>       
>>> and execute the script
>>> ./myScript option1 option2
>>>       
>>> so that the options at correct locations will be written.
>>>       
>>> Any other options for this simple job that i can improve my Python a
>>> bit as well.
>>>       
>>> Best,
>>> Umut
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>       
>> Your description is not explicit enough to convey your intention. If
>> your template file is too long to post, post a short representative
>> section, an input data sample and a hand-edited sample of the output
>> data you want to generate. You will get more and better advice. .
>>
>> Frederic
>>     
>
> Thanks here is a  sample Session file from a commercial finite element
> pre-post processor PATRAN, the file longer but the ideas are the same
> so that let me give an example, say I would like to make write line 10
> composed of some command line arguments: path+database_name, Also
> there are some lines similar to this in the below sections of the
> file. I am doing it with a if-elif-else clause checking the line
> numbers with which I thought of there should be a better way and ended
> up asking...
>
>      1 $# Session file patran.ses.02 started recording at 05-May-09
> 11:12:25
>      2 $# Build: 15.0.038 Mon Aug 20 21:31:45 PDT 2007
>      3 $# Recorded by: Patran 2007 r1b
>      4 $# FLEXlm initialization complete.  Acquiring license(s)...
>      5 $# License File: /opt/patran-2007r1b/license.dat
>      6 $# Patran 2007 r1b has obtained 1 concurrent license(s) from
> FLEXlm per a
>      7 $# request to execute on Linux node hpc06(001e4f20c494) (Linux
>      8 $# 2.6.23.15-80.fc7) at 05-May-09 11:12:25.
>      9 uil_file_new.go( "/opt/patran-2007r1b/template.db",  @
>     10 "/home/utabak/PATRAN/cavityModels/fromGmsh.db" )
>   
Okay! Please clarify:
Question 1: Is it always line 10 or is it always a path-file-name, which 
could be on another line?
Question 2: Are there other lines you want to translate? If yes, how do 
you identify them? By line number or by content?
Question 3: If you identify your target by content, what ist the 
distinctive feature which it doesn't share with non-target lines? (e.g. 
Path-file name format and nothing else)
Question 4: Do you want to substitute the path name with another path 
name and the file name with another file name, both of which you supply 
on the command line?
Question 5: If your input has a number of different names, do you want 
to translate them all to the same name, in which case you'd only have to 
supply a single pair of names on the command line?
Question 6: If your input has a number of different names and your 
translation also consists of a number of path-file-name pairs, how do 
the targets and substitutes correlate? Sequentially? By pattern?
Question 7: Can you estimate how many different path-file-names your 
complete session file contains? And how many different substitutes you 
may have in extreme cases?
>     11 $# Question from application FILE
>     12 $#     Database /home/utabak/PATRAN/cavityModels/fromGmsh.db
> already exists.
>     13 $# Do you wish to delete the existing database and create a new
> one ?
>     14 $? YES 36000002
>     15 $# Copying /opt/patran-2007r1b/template.db to
>   
Question 8: Here you have a file name. What do you do with it?
>     16 $# /home/utabak/PATRAN/cavityModels/fromGmsh.db
>   
Question 9: Here line 10 repeats. What do you do with it?
>     17 $# Template copy complete.
>     18 $# Database version 3.8 created by Patran 2007 r1b successfully
> opened.
>     19 ga_viewport_size_set( "default_viewport", 14.571214, 7.509466,
> 1 )
>     20 ga_viewport_location_set( "default_viewport", 0.000000,
> 1.088771, 1 )
>     21 $# Creating journal file /home/utabak/PATRAN/cavityModels/
> fromGmsh.db.jou at
>   
Question 10: Here the file name of line 10 repeats. What do you do?
>     22 $# 05-May-09 11:12:43
>     23 nastran_input_import( "/home/utabak/PATRAN/cavityModels/
> toPatran.bdf",  @
>   
Question 11: Here the file name of line 10 repeats. What do you do?

>     24 "default_group", 10, [TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE,
> TRUE, FALSE,  @
>     25 TRUE], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0,
> 0, 0], [ @
>     26 -2000000000, -2000000000, -2000000000, -2000000000,
> -2000000000, -2000000000,  @
>     27 -2000000000, -2000000000, 0, 0] )
>     28 $# Reading of MSC.Nastran input file completed.
>     29 ui_exec_function( "mesh_seed_display_mgr", "init" )
>
> Best,
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   

Frederic



From arnodel at googlemail.com  Tue May  5 09:30:01 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 5 May 2009 06:30:01 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com> 
	<mailman.5100.1241526783.11746.python-list@python.org>
Message-ID: <565698f7-d95b-4b99-95a5-5de68d983400@q2g2000vbr.googlegroups.com>

On 5 May, 13:33, Luis Zarrabeitia <ky... at uh.cu> wrote:
> On Tuesday 05 May 2009 02:46:58 am Chris Rebert wrote:
>
> > <devils_advocate>
> > Adding syntax is EVIL(tm) for it angers the Gods of Backwards
> > Compatibility, and this proposal is completely unnecessary because you
> > could instead just write:
> [...]
> > And there would be much clashing with existing variable names,
> > for keywords are the Devil's work!
> > </devils_advocate>
>
> Heh. I liked the proposal (though I'm not 100% sold on the name __this__), and
> one of the reasons I liked it was... it preempted the name-clashing argument.
> Not a new keyword, just a variable that is injected on the local namespace,
> so it would only clash with code that uses __this__ as a global (or that
> expects to use an unbound __this__).

One issue with automatically binding a local variable to the current
function is with nested functions:

def foo()
    def bar():
       # How do I call foo() from here?

One solution would be

def foo()
    def bar(foo=__this__):
        foo()

I don't know, it does not convince me ATM.

--
Arnaud


From nickgaens at gmail.com  Tue May  5 09:45:25 2009
From: nickgaens at gmail.com (nickgaens at gmail.com)
Date: Tue, 5 May 2009 06:45:25 -0700 (PDT)
Subject: Open a dialog from MainWindow - pyQT4 - Beginner :-)
References: <gtn8q6$e55$1@news-cedar.fernuni-hagen.de>
Message-ID: <55a5a393-f204-4bcb-a010-424bd4ddf063@o30g2000vbc.googlegroups.com>

On May 4, 7:31?pm, Florian Wollenschein <Florian.Wollensch... at FernUni-
Hagen.de> wrote:
> Dear folks,
>
> I'm just working on a pyQT4 version of my txt to html converter thc (see
> listick.org for details).
>
> I created the MainWindow with QT Designer and then converted it to .py
> with pyuic4. It works well so far. Then I created a new UI for my
> abtDialog (about dialog for my application). I did the same as with the
> MainWindow, so I have two UIs and two *_ui.py files now. How can I open
> the dialog from my main application class?
>
> Here's part of the code I'm using:
>
> ...
> self.connect(self.actionAbout,
> ? ? ? ? ? ? ? ? ?QtCore.SIGNAL("triggered()"), self.OpenAbout)
> ...
> ? def OpenAbout(self):
> ? ? ? ? ?pass
> ...
>
> The OpenAbout function should open the dialog. I've already tried a
> abtDialog.show() after creating it via abtDialog = ThcAboutDialog()
> (ThcAboutDialog is the class for this dlg).
>
> Any ideas?
>
> Thanks,
> Listick Lorchhttp://www.listick.org
>
> PS: Keep in mind that I'm quite a beginner in the field of python and qt...

def OpenAbout(self):
    # don't forget to connect the "Ok"-button of this about-dialog to
QDialog::accept() ;-)
    abtDialog.setAttribute(QtCore.Qt.WA_DeleteOnClose)
    abtDialog.exec_()

R3

ps: you could take a look at a QMessageBox::information or so to make
this more "simple"


From Scott.Daniels at Acm.Org  Tue May  5 09:47:03 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 05 May 2009 06:47:03 -0700
Subject: exit a program gracefully
In-Reply-To: <gtp7sg$vbc$1@lust.ihug.co.nz>
References: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
	<50697b2c0905041514t22ac9436td0dbe51e0f22dcfa@mail.gmail.com>
	<mailman.5079.1241476454.11746.python-list@python.org>
	<gtp7sg$vbc$1@lust.ihug.co.nz>
Message-ID: <YMednZ86zo22353XnZ2dnUVZ_rSdnZ2d@pdx.net>

Lawrence D'Oliveiro wrote:
> It would be nice if Python offered a straightforward equivalent to
>     ...
>     do /*once*/
>       {
>         ... do stuff ...
>         if (check1_failed)
>             break;
>         ... do even more stuff ...
>       }
>     while (false);
>     ... cleanup goes here ...

What's wrong with:

     for _ in (None,):
         ... do stuff ...
         if (check1_failed)
             break;
         ... do even more stuff ...
     ... cleanup ...

--Scott David Daniels
Scott.Daniels at Acm.Org


From Scott.Daniels at Acm.Org  Tue May  5 10:02:32 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 05 May 2009 07:02:32 -0700
Subject: Problem with case insensitive volumes
In-Reply-To: <26c57bf5-5ad2-4838-8097-c8d51cf1ccae@n8g2000vbb.googlegroups.com>
References: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
	<mailman.5088.1241498014.11746.python-list@python.org>
	<26c57bf5-5ad2-4838-8097-c8d51cf1ccae@n8g2000vbb.googlegroups.com>
Message-ID: <b4adnUex6-RR2J3XnZ2dnUVZ_t2dnZ2d@pdx.net>

spillz wrote:
>> os;walk will tell you the correct case for each node.   So if it gives
>> you a different case than the stored form, you have your answer.
> 
> Thanks, although I was hoping that wouldn't be the answer (I have to
> compare a LOT of files).
What is so tough about something like:

base, dirs, files = next(os.walk(dirn))  # older: os.walk(dirn).next()
current = dict((name.upper() for name in dirs + files)
...
changed = some_name == current[some_name.upper()]
...

--Scott David Daniels
Scott.Daniels at Acm.Org


From python-url at phaseit.net  Tue May  5 10:15:21 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Tue, 5 May 2009 14:15:21 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (May  5)
Message-ID: <gtphlp$hor$1@lairds.us>

QOTW:  "... [S]omebody's gotta put up some resistance to cute shortcuts, or
we'll find ourselves back with Perl." - Peter Pearson
    http://groups.google.com/group/comp.lang.python/msg/2ce1b43e4d40528f


    How much memory occupies an object?
        http://groups.google.com/group/comp.lang.python/t/e0581c6c80e813aa/

    Get the item actually contained in a set:
        http://groups.google.com/group/comp.lang.python/t/a2ab7d3ffc28e1b1/

    Manipulating individual bits in a long bit string
        http://groups.google.com/group/comp.lang.python/t/471162166df52100/

    A "float" version of range() -like range(-10.5,10.5,0.1)- isn't trivial
    to implement:
        http://groups.google.com/group/comp.lang.python/t/70bdf77282b63944/

    How can a function refer to itself?
        http://groups.google.com/group/comp.lang.python/t/d265da85d4b70eaf/

    Why do all objects have an implicit boolean value?
        http://groups.google.com/group/comp.lang.python/t/1167f4f275a9a64c/

    multiprocessing: How to notify other processes that there is no more
    work to do:
        http://groups.google.com/group/comp.lang.python/t/8c57b2796cae95ff/

    bearophile kindly shares some of his itertools enhancements:
        http://groups.google.com/group/comp.lang.python/t/642e3d4dc3e04a46/

    A package/module/class confusion -- also: how to organize a package
    containing hundreds of classes
        http://groups.google.com/group/comp.lang.python/t/c216908a72d4fb8c/

    Python lists aren't linked lists, as Lisp programmers are used to:
        http://groups.google.com/group/comp.lang.python/t/a0ce55f3d1fbe25/

    And the Lisp mentality is very different :)
        http://groups.google.com/group/comp.lang.python/t/68bf9c5bae807545/

    Passing a method as an argument from within the same class:
        http://groups.google.com/group/comp.lang.python/t/dabfc9f5443b7892/

    Handling large arrays that barely fit in the address space:
        http://groups.google.com/group/comp.lang.python/t/7f065dac609436ea/
    

========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiats":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.
	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    Enjoy the *Python Magazine*.
	http://pymag.phparch.com/

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
  http://search.gmane.org/?query=python+URL+weekly+news+links&group=gmane.comp.python.general&sort=date
  http://groups.google.com/groups/search?q=Python-URL!+group%3Acomp.lang.python&start=0&scoring=d&
  http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes

There is *not* an RSS for "Python-URL!"--at least not yet.  Arguments
for and against are occasionally entertained.


Suggestions/corrections for next week's posting are always welcome.
E-mail to <Python-URL at phaseit.net> should get through.

To receive a new issue of this posting in e-mail each Monday morning
(approximately), ask <claird at phaseit.net> to subscribe.  Mention
"Python-URL!".  Write to the same address to unsubscribe.


-- The Python-URL! Team--

Phaseit, Inc. (http://phaseit.net) is pleased to participate in and
sponsor the "Python-URL!" project.  Watch this space for upcoming
news about posting archives.


From sion at viridian.paintbox  Tue May  5 10:43:07 2009
From: sion at viridian.paintbox (Sion Arrowsmith)
Date: Tue, 05 May 2009 14:43:07 GMT
Subject: object query assigned variable name?
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
	<mailman.4961.1241238141.11746.python-list@python.org>
Message-ID: <%fYLl.34150$Sp3.23473@newsfe25.ams2>

John O'Hagan  <research at johnohagan.com> wrote:
>I can see that it's tantalizing, though, because _somebody_ must know about 
>the assignment; after all, we just executed it!

Except we haven't, if we're talking about reporting from the
object's __init__:

>>> class Brian:
...     def __init__(self):
...         print "I'm Brian!"
...
>>> l = []
>>> l[1] = Brian()
I'm Brian!
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list assignment index out of range

(Yeah, I know that's a setitem call not an assignment. Point stands.
It also demonstrates why the whole idea of "what name is a newly-
created object assigned to" is broken.)

-- 
\S

   under construction



From ross.jett at gmail.com  Tue May  5 10:49:24 2009
From: ross.jett at gmail.com (Ross)
Date: Tue, 5 May 2009 07:49:24 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com>
Message-ID: <fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>

On May 5, 12:32?am, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 5, 1:12?am, John Yeung <gallium.arsen... at gmail.com> wrote:
>
> > [...] the problem may require bigger guns (either much better
> > math or much more sophisticated programming).
>
> Yes, I'm responding to myself.
>
> Well, I went ahead with the approach I mentioned earlier, generating
> all possible matches and then selecting among them as needed to fill
> up the courts, trying to keep the number of matches played by each
> player as fair as possible. ?(I should mention that this, or something
> similar, was suggested earlier by someone else in a different thread,
> in response to the same question by the same OP.)
>
> I did use "bigger guns" (mainly a class for player objects, with
> custom __cmp__ method), but still didn't do anything with doubles.
>
> I haven't tested it much, but I'll post it if anyone's interested.
> (That way people can pick on me instead of the OP. ;)
>
> John

I'm interested to see what you did. From your description, it sounds
like I've tried what you've done, but when I implemented my version,
it took minutes to evaluate for bigger numbers. If that isn't the case
with yours, I'd be interested in seeing your implementation.


From sion at viridian.paintbox  Tue May  5 11:09:48 2009
From: sion at viridian.paintbox (Sion Arrowsmith)
Date: Tue, 05 May 2009 15:09:48 GMT
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
	<mailman.5018.1241395534.11746.python-list@python.org>
Message-ID: <0FYLl.34151$Sp3.6719@newsfe25.ams2>

Gabriel Genellina <gagsl-py2 at yahoo.com.ar> wrote:
>En Sun, 03 May 2009 17:41:49 -0300, Zentrader <zentraders at gmail.com>  
>escribi?:
>> There is no need for a function or a generator.  A for() loop is a
>> unique case of a while loop
>> ## for i in range(-10.5, 10.5, 0.1):
>> ctr = -10.5
>> while ctr < 10.5:
>>    print ctr
>>    ctr += 0.1
>
>Isn't so easy. You have representation errors and rounding errors here,  
>and they accumulate. [ ... ]

And remarkably quickly at that:

>>> ctr = -10.5
>>> for i in range(-105, 106):
...     i *= 0.1
...     if i != ctr: print repr(i), repr(ctr)
...     ctr += 0.1
...
-10.0 -10.000000000000002
etc.

-- 
\S

   under construction



From ricaraoz at gmail.com  Tue May  5 11:12:23 2009
From: ricaraoz at gmail.com (=?ISO-8859-1?Q?Ricardo_Ar=E1oz?=)
Date: Tue, 05 May 2009 12:12:23 -0300
Subject: yet another list comprehension question
In-Reply-To: <f0b70e0d-31c2-4d95-bec4-0e57e5d3a860@o14g2000vbo.googlegroups.com>
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>	<gtm1ik$19tj$1@adenine.netfront.net>	<mailman.5039.1241439352.11746.python-list@python.org>
	<f0b70e0d-31c2-4d95-bec4-0e57e5d3a860@o14g2000vbo.googlegroups.com>
Message-ID: <4A005757.7050405@gmail.com>

namekuseijin wrote:
> On May 4, 9:15 am, David Robinow <drobi... at gmail.com> wrote:
>   
>> On Mon, May 4, 2009 at 2:33 AM, namekuseijin
>>
>> <namekuseijin.nos... at gmail.com> wrote:
>>     
>>>>>> ls = [(1,2), (3,4), (5, None), (6,7), (8, None)]
>>>>>> [(x,y) for (x,y) in ls if y]
>>>>>>             
>>> [(1, 2), (3, 4), (6, 7)]
>>>       
>> Nope. That filters out 0 as well as None. Not what the OP asked for.
>>     
>
> True.  I'm still a C programmer at heart I guess.  ah, the flexibility
> of 0... ;)
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   
This seems to work for any length tuples :

>>> a = [(1,2), (3,4, 'goes'), (5,None), (6,7, 8, 'as', None), (8,
None), (9, 0)]
>>> [tup for tup in a if not [e for e in tup if e == None]]
[(1, 2), (3, 4, 'goes'), (9, 0)]


-------------- next part --------------
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From Florian.Wollenschein at FernUni-Hagen.de  Tue May  5 11:43:09 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Tue, 05 May 2009 17:43:09 +0200
Subject: Open a dialog from MainWindow - pyQT4 - Beginner :-)
In-Reply-To: <55a5a393-f204-4bcb-a010-424bd4ddf063@o30g2000vbc.googlegroups.com>
References: <gtn8q6$e55$1@news-cedar.fernuni-hagen.de>
	<55a5a393-f204-4bcb-a010-424bd4ddf063@o30g2000vbc.googlegroups.com>
Message-ID: <gtpmqd$c4i$1@news-cedar.fernuni-hagen.de>

nickgaens at gmail.com wrote:
> On May 4, 7:31 pm, Florian Wollenschein <Florian.Wollensch... at FernUni-
> Hagen.de> wrote:
>> Dear folks,
>>
>> I'm just working on a pyQT4 version of my txt to html converter thc (see
>> listick.org for details).
>>
>> I created the MainWindow with QT Designer and then converted it to .py
>> with pyuic4. It works well so far. Then I created a new UI for my
>> abtDialog (about dialog for my application). I did the same as with the
>> MainWindow, so I have two UIs and two *_ui.py files now. How can I open
>> the dialog from my main application class?
>>
>> Here's part of the code I'm using:
>>
>> ...
>> self.connect(self.actionAbout,
>>                  QtCore.SIGNAL("triggered()"), self.OpenAbout)
>> ...
>>   def OpenAbout(self):
>>          pass
>> ...
>>
>> The OpenAbout function should open the dialog. I've already tried a
>> abtDialog.show() after creating it via abtDialog = ThcAboutDialog()
>> (ThcAboutDialog is the class for this dlg).
>>
>> Any ideas?
>>
>> Thanks,
>> Listick Lorchhttp://www.listick.org
>>
>> PS: Keep in mind that I'm quite a beginner in the field of python and qt...
> 
> def OpenAbout(self):
>     # don't forget to connect the "Ok"-button of this about-dialog to
> QDialog::accept() ;-)
>     abtDialog.setAttribute(QtCore.Qt.WA_DeleteOnClose)
>     abtDialog.exec_()
> 
> R3
> 
> ps: you could take a look at a QMessageBox::information or so to make
> this more "simple"

Wow, thanks for your help. Now it's working :-)

Great.
Regards,
Listick


From georgeoliverGO at gmail.com  Tue May  5 11:52:39 2009
From: georgeoliverGO at gmail.com (George Oliver)
Date: Tue, 5 May 2009 08:52:39 -0700 (PDT)
Subject: call function of class instance with no assigned name?
Message-ID: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>

hi, I'm a Python beginner with a basic question. I'm writing a game
where I have keyboard input handling defined in one class, and command
execution defined in another class. The keyboard handler class
contains a dictionary that maps a key to a command string (like 'h':
'left') and the command handler class contains functions that do the
commands (like def do_right(self):),

I create instances of these classes in a list attached to a third,
'brain' class. What I'd like to have happen is when the player presses
a key, the command string is passed to the command handler, which runs
the function. However I can't figure out a good way to make this
happen.

I've tried a dictionary mapping command strings to functions in the
command handler class, but those dictionary values are evaluated just
once when the class is instantiated. I can create a dictionary in a
separate function in the command handler (like a do_command function)
but creating what could be a big dictionary for each input seems kind
of silly (unless I'm misunderstanding something there).

What would be a good way to make this happen, or is there a different
kind of architecture I should be thinking of?


From damienlmoore at gmail.com  Tue May  5 11:55:13 2009
From: damienlmoore at gmail.com (spillz)
Date: Tue, 5 May 2009 08:55:13 -0700 (PDT)
Subject: Problem with case insensitive volumes
References: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
	<mailman.5088.1241498014.11746.python-list@python.org>
	<26c57bf5-5ad2-4838-8097-c8d51cf1ccae@n8g2000vbb.googlegroups.com>
	<b4adnUex6-RR2J3XnZ2dnUVZ_t2dnZ2d@pdx.net>
Message-ID: <b5d10d01-0f56-4df9-9e4e-99a93a0e0a0f@s31g2000vbp.googlegroups.com>

On May 5, 10:02?am, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> What is so tough about something like:
>
> base, dirs, files = next(os.walk(dirn)) ?# older: os.walk(dirn).next()
> current = dict((name.upper() for name in dirs + files)
> ...
> changed = some_name == current[some_name.upper()]
> ...

not so fast. :) Consider:

/my/path/to/usbkey/and/file

everything up to "/my/path/to/usbkey" is case sensitive. only the "and/
file" is case insensitive. but my list of stored paths might include
all images under "/my". thus

/my/path/to/usbkey/and/file1==/my/path/to/usbkey/and/FILE1
/my/path/to/usbkey/and/file1==/my/path/to/usbkey/AND/FILE1
but
/my/path/to/usbkey/and/file1!=/my/path/TO/usbkey/AND/FILE1

so to do this right I'd need to establish which parts of the path are
case insensitive. being able to retrieve the actual path from an
equivalent representation would be so much simpler.


From clp2 at rebertia.com  Tue May  5 12:01:52 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 5 May 2009 09:01:52 -0700
Subject: call function of class instance with no assigned name?
In-Reply-To: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
Message-ID: <50697b2c0905050901v616d4f6axcdb283eaa2890cc1@mail.gmail.com>

On Tue, May 5, 2009 at 8:52 AM, George Oliver <georgeoliverGO at gmail.com> wrote:
> hi, I'm a Python beginner with a basic question. I'm writing a game
> where I have keyboard input handling defined in one class, and command
> execution defined in another class. The keyboard handler class
> contains a dictionary that maps a key to a command string (like 'h':
> 'left') and the command handler class contains functions that do the
> commands (like def do_right(self):),
>
> I create instances of these classes in a list attached to a third,
> 'brain' class. What I'd like to have happen is when the player presses
> a key, the command string is passed to the command handler, which runs
> the function. However I can't figure out a good way to make this
> happen.
>
> I've tried a dictionary mapping command strings to functions in the
> command handler class, but those dictionary values are evaluated just
> once when the class is instantiated. I can create a dictionary in a
> separate function in the command handler (like a do_command function)
> but creating what could be a big dictionary for each input seems kind
> of silly (unless I'm misunderstanding something there).
>
> What would be a good way to make this happen, or is there a different
> kind of architecture I should be thinking of?

You could exploit Python's dynamism by using the getattr() function:

key2cmd = {'h':'left'}
cmd_name = key2cmd[keystroke]
getattr("do_"+cmd_name, cmd_handler)() #same as cmd_handler.do_left()


Cheers,
Chris
-- 
http://blog.rebertia.com


From aahz at pythoncraft.com  Tue May  5 12:06:59 2009
From: aahz at pythoncraft.com (Aahz)
Date: 5 May 2009 09:06:59 -0700
Subject: problem in using sendmail in multi thread
References: <343747e9-549f-4336-9b15-522411a785a3@x1g2000prh.googlegroups.com>
Message-ID: <gtpo73$g1p$1@panix3.panix.com>

In article <343747e9-549f-4336-9b15-522411a785a3 at x1g2000prh.googlegroups.com>,
gganesh  <ganesh.gbg at gmail.com> wrote:
>
>I'm a beginner in using Python script
>I'm trying to send mails using multi-thread

You need a separate SMTP connection for each thread.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From nickle at gmail.com  Tue May  5 12:07:29 2009
From: nickle at gmail.com (Nick)
Date: Tue, 5 May 2009 09:07:29 -0700 (PDT)
Subject: SQL and CSV
Message-ID: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>

I have a requirement to read a CSV file. Normally, no problem, just
import CSV and slurp the file up.

However, in this case I want to filter out lines that have fields set
to particular values.

It would be neat to be able to do something like this.

select * from test.csv where status <> "Canceled"

Using adodb I can do this, so long as I don't have the where clause. :-
(

Is there a reasonable lightweight way of doing this in Python?

I could write some python code that is used to filter rows, and inport
that from config, but it's not quite as elegant as an SQL route.

Thanks

Nick


From james at agentultra.com  Tue May  5 12:15:15 2009
From: james at agentultra.com (J Kenneth King)
Date: Tue, 05 May 2009 12:15:15 -0400
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
Message-ID: <85ljpb8r1o.fsf@agentultra.com>

Emile van Sebille <emile at fenx.com> writes:

> On 5/1/2009 7:31 AM J Kenneth King said...
>> Chris Rebert <clp2 at rebertia.com> writes:
>>> b = []
>>> for pair in a:
>>>     for item in pair:
>>>         b.append(item)
>>
>> This is much more clear than a nested comprehension.
>>
>> I love comprehensions, but abusing them can lead to really dense and
>> difficult to read code.
>
> I disagree on dense and difficult, although I'll leave open the
> question of abuse.

Dense and difficult may be subjective to people like you or I, but you
left out the "to read" part of that sentence. I was referring to the
negative effect nested or complex list comprehensions can have on
readability.

> b = [ item for pair in a for item in pair ]

It's a clever statement, but use it once and its gone. Why not use the
expanded form in a function definition and get an even shorter, but
clearer statement?

>>> b = flatten(a)

Boom, done.

> This is exactly the code above expressed in comprehension form.
>
> It's worth knowing that a list comprehension is structured identically
> to the equivalent for loop.  So it really is neither more dense nor
> more difficult to read.  Further, you can tell immediately from the
> start of the list comprehension what you've got -- in this case a list
> of item(s).
>
> Here with some slight changes...
>
>>>> a = [(1, 2), (3, 4, 7), (5, 6)]
>>>> [ item for j in a if len(j)==2 for item in j if item % 2 ]
> [1, 5]
>
> ...opposed to...
>
>>>> for j in a:
> ...     if len(j)==2:
> ...         for item in j:
> ...             if item % 2:
> ...                 b.append(item)
> ...
>>>> b
> [1, 5]
>>>>

Thanks for the lesson in list comprehensions, but I'm well aware of
how they work.

List comprehensions can make a reader of your code apprehensive
because it can read like a run-on sentence and thus be difficult to
parse. The Python documentation discourages their use and I believe
for good reason. It's much easier to explain complex processes with a
function rather than a single nested statement.

>
> YMMV,
>
> Emile

It will apparently vary greatly. Depending on how much coffee I've
had.

;)

J


From arnodel at googlemail.com  Tue May  5 12:17:10 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 05 May 2009 17:17:10 +0100
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5107.1241539316.11746.python-list@python.org>
Message-ID: <m2bpq7r0c9.fsf@googlemail.com>

Chris Rebert <clp2 at rebertia.com> writes:

> On Tue, May 5, 2009 at 8:52 AM, George Oliver <georgeoliverGO at gmail.com> wrote:
>> hi, I'm a Python beginner with a basic question. I'm writing a game
>> where I have keyboard input handling defined in one class, and
>> command execution defined in another class. The keyboard handler
>> class contains a dictionary that maps a key to a command string (like
>> 'h': 'left') and the command handler class contains functions that do
>> the commands (like def do_right(self):),
>>
>> I create instances of these classes in a list attached to a third,
>> 'brain' class. What I'd like to have happen is when the player
>> presses a key, the command string is passed to the command handler,
>> which runs the function. However I can't figure out a good way to
>> make this happen.
>>
>> I've tried a dictionary mapping command strings to functions in the
>> command handler class, but those dictionary values are evaluated just
>> once when the class is instantiated. I can create a dictionary in a
>> separate function in the command handler (like a do_command function)
>> but creating what could be a big dictionary for each input seems kind
>> of silly (unless I'm misunderstanding something there).
>>
>> What would be a good way to make this happen, or is there a different
>> kind of architecture I should be thinking of?
>
> You could exploit Python's dynamism by using the getattr() function:
>
> key2cmd = {'h':'left'}
> cmd_name = key2cmd[keystroke]
> getattr("do_"+cmd_name, cmd_handler)() #same as cmd_handler.do_left()

getattr(cmd_handler, "do_" + cmd_name)() will work even better!

-- 
Arnaud


From james at agentultra.com  Tue May  5 12:18:00 2009
From: james at agentultra.com (J Kenneth King)
Date: Tue, 05 May 2009 12:18:00 -0400
Subject: Any idea to emulate tail -f
References: <mailman.5091.1241503147.11746.python-list@python.org>
	<55f6d122-187f-4796-8162-78b066875c4d@q14g2000vbn.googlegroups.com>
Message-ID: <85hbzz8qx3.fsf@agentultra.com>

Iain King <iainking at gmail.com> writes:

> On May 5, 7:00?am, Joel Juvenal Rivera Rivera <joel... at gmail.com>
> wrote:
>> I want to make something very similar to ?the command tail -f (follow a
>> file), i have been trying ?with some while True and some microsleeps
>> (about .1 s); did someone has already done something like this?
>>
>> And about the file is the apache acceslog ?of a site with a lot of
>> traffic.
>>
>> Regards ? ?
>>
>> joe / Joel Rivera
>
> This is very interesting, about using Generator Expressions:
> http://209.85.229.132/search?q=cache:ZHrV4E0eTI8J:www.dabeaz.com/generators/Generators.pdf
>
> Relevant stuff about 'tail -f' is on page 39, but I'd read the whole
> thing if you can.
>
> Iain

+1

I second this suggestion. I've used this method in many scripts of
late and it is quite handy.

He even takes it a little further and shows you some neat things you
can do with it later on.


From mail at timgolden.me.uk  Tue May  5 12:19:32 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 05 May 2009 17:19:32 +0100
Subject: SQL and CSV
In-Reply-To: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
Message-ID: <4A006714.3090601@timgolden.me.uk>

Nick wrote:
> I have a requirement to read a CSV file. Normally, no problem, just
> import CSV and slurp the file up.
> 
> However, in this case I want to filter out lines that have fields set
> to particular values.
> 
> It would be neat to be able to do something like this.
> 
> select * from test.csv where status <> "Canceled"
> 
> Using adodb I can do this, so long as I don't have the where clause. :-
> (
> 
> Is there a reasonable lightweight way of doing this in Python?
> 
> I could write some python code that is used to filter rows, and inport
> that from config, but it's not quite as elegant as an SQL route.


Not entirely clear what you are and aren't prepared to try here, but...
the most obvious Python-based way to do this is treating the csv reader
as an iterator and filtering there. Your last line suggests that's not
what you want but just in case I've misunderstood:

<test.csv>
id,code,status
1,"ONE","Active"
2,"TWO","Cancelled"
3,"THREE","Active"
</test.csv>

<code>
import csv

for row in csv.DictReader (open ("c:/temp/test.csv", "rb")):
  if row['status'] != 'Cancelled':
    print row

</code>

Doesn't seem too onerous, and could obviously be wrapped in
some useful class/module.

But if you really want to go the SQL route, I believe there are
ODBC adapters for CSV which, combined with PyODBC or CeODBC,
would probably take you where you want to go.

TJG


From piet at cs.uu.nl  Tue May  5 12:25:06 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Tue, 05 May 2009 18:25:06 +0200
Subject: problem in using sendmail in multi thread
References: <343747e9-549f-4336-9b15-522411a785a3@x1g2000prh.googlegroups.com>
Message-ID: <m2zldrms9p.fsf@cs.uu.nl>

>>>>> gganesh <ganesh.gbg at gmail.com> (g) wrote:

>g> hi,
>g> I'm a beginner in using Python script
>g> I'm trying to send mails using multi-thread
>g> I wrote



>g> FROM = 'ganeshxxxx at xxxx.com'
>g> # for more mail add';' the another mail id
>g> listTo = ['g.xxx at gmail.com', 'xxjango.py at gmail.com',
>g> 'xxxxx at yahoo.co.in']
>g> SUBJECT = 'This is the subject'
>g> MSGBODY = 'This the body of the message '
>g> MAILSERVER = 'mail.xxxx.com'
>g> port = 25
>g> username = 'xxxxx'
>g> password = 'xxxxx'

>g> # trim the strings of any leading or trailing spaces
>g> FROM = FROM.strip()
>g> SUBJECT = SUBJECT.strip()
>g> MSGBODY = MSGBODY.strip()
>g> MAILSERVER = MAILSERVER.strip()
>g> username = username.strip()
>g> password = password.strip()



>g> #Connect to server
>g> print 'Connecting to mail server ', MAILSERVER
>g> try:
>g> 	s = smtplib.SMTP(MAILSERVER,port)

You can't have a single SMTP connection that's used in multiple threads.
That is what causes the error. Each thread should have its own SMTP
connection. So move this code (above and below) into the run() method.

>g> 	print 'connected'
>g> #s.set_debuglevel(1)
>g> except:
>g> 	 print 'ERROR: Unable to connect to mail server', sys.exc_info	()[0]
>g> 	 sys.exit(1)

>g> #login to server
>g> if password <> '':
>g> 	print 'Logging into mail server'

I think this try except block should be inside the if statement, i.e.
indented 4 spaces.

>g> try:
>g> 	s.login(username,password)
>g> except:
>g> 	print 'ERROR: Unable to login to mail server', MAILSERVER
>g> 	print 'Please recheck your password'
>g> 	sys.exit(1)

>g> #--------------------------------------------------
>g> print "Starting Multi Thread Method"


>g> class MyThread(Thread):

>g>     def __init__(self, site, s, FROM, MSGBODY):
>g>         Thread.__init__(self)
>g>         self.site = site
>g> 	self.s=s
>g> 	self.FROM=FROM
>g> 	self.MSGBODY=MSGBODY

You give the s (connection) here as a parameter, store it in self.s and
never use that attribute.

>g>     def run(self):
>g> 	print "running for %s " %self.site
>g> 	s.sendmail(self.FROM, self.site, self.MSGBODY)

Here you use the global s, not self.s

As I said above you should do the SMTP connection setup, including the
login, here, and store the connection either in self.s or in a local
variable s in the method. As you don't use the s in another method, I
think a local variable is better.

>g> 	print "Emailed for  site %s" %self.site

>g> a= time.time()
>g> threads = []

>g> for site in listTo:
>g>     T = MyThread(site,s,FROM,MSGBODY)
>g>     threads.append(T)
>g>     T.start()

>g> for i in threads:
>g>     i.join()

Of course the next 2 lines should also be moved to run().

>g> s.quit()
>g> s.close()
>g> print "Took %s seconds" %str(time.time()-a)

>g> #-----------------------------------------------------

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From nickle at gmail.com  Tue May  5 12:25:42 2009
From: nickle at gmail.com (Nick)
Date: Tue, 5 May 2009 09:25:42 -0700 (PDT)
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
Message-ID: <1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>

On May 5, 5:19?pm, Tim Golden <m... at timgolden.me.uk> wrote:
> Nick wrote:
> > I have a requirement to read a CSV file. Normally, no problem, just
> > import CSV and slurp the file up.
>
> > However, in this case I want to filter out lines that have fields set
> > to particular values.
>
> > It would be neat to be able to do something like this.
>
> > select * from test.csv where status <> "Canceled"
>
> > Using adodb I can do this, so long as I don't have the where clause. :-
> > (
>
> > Is there a reasonable lightweight way of doing this in Python?
>
> > I could write some python code that is used to filter rows, and inport
> > that from config, but it's not quite as elegant as an SQL route.
>
> Not entirely clear what you are and aren't prepared to try here, but...
> the most obvious Python-based way to do this is treating the csv reader
> as an iterator and filtering there. Your last line suggests that's not
> what you want but just in case I've misunderstood:
>
> <test.csv>
> id,code,status
> 1,"ONE","Active"
> 2,"TWO","Cancelled"
> 3,"THREE","Active"
> </test.csv>
>
> <code>
> import csv
>
> for row in csv.DictReader (open ("c:/temp/test.csv", "rb")):
> ? if row['status'] != 'Cancelled':
> ? ? print row
>
> </code>
>
> Doesn't seem too onerous, and could obviously be wrapped in
> some useful class/module.
>
> But if you really want to go the SQL route, I believe there are
> ODBC adapters for CSV which, combined with PyODBC or CeODBC,
> would probably take you where you want to go.
>
> TJG

Part of the problem is that the 'selection' needs to be in a config
file. I can put the if row['status'] != 'Cancelled': return True into
a config, read it and eval it, but its not quite as clean as an sql
route.

Nick


From Florian.Wollenschein at FernUni-Hagen.de  Tue May  5 12:34:17 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Tue, 05 May 2009 18:34:17 +0200
Subject: thc v0.3 - txt to html converter - better code?
Message-ID: <gtppqc$7v1$1@news-cedar.fernuni-hagen.de>

Hi all,

here's some code of thc, my txt to html converter programmed with Python 
and pyQT4:
-------------------------------------------------------------------------------
if self.rdioBtnTransitional.isChecked():
             if self.cmboBoxLang.currentText() == "English":
                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD 
HTML 4.0 Transitional//EN">' + '\n')
             elif self.cmboBoxLang.currentText() == "German":
                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD 
HTML 4.0 Transitional//DE">' + '\n')
         else:
             file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 
4.0 Strict//EN">' + '\n')
             if self.cmboBoxLang.currentText() == "English":
                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD 
HTML 4.0 Strict//EN">' + '\n')
             elif self.cmboBoxLang.currentText() == "German":
                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD 
HTML 4.0 Strict/DE">' + '\n')
--------------------------------------------------------------------------------

Do you have any ideas for a better code than that? Could this be done 
smarter, shorter, whatever!?

Thanks in advance,
Listick
http://www.listick.org


From silverburgh.meryl at gmail.com  Tue May  5 12:41:42 2009
From: silverburgh.meryl at gmail.com (silverburgh)
Date: Tue, 5 May 2009 09:41:42 -0700 (PDT)
Subject: Error in running python -v on Mac ox 10.5.
Message-ID: <b39ce186-56d3-4dae-84ce-24a7c92bb50a@k9g2000pra.googlegroups.com>


Hi,

I run 'python -v' on Macos 10.5 but I get this error :
# can't create /System/Library/Frameworks/Python.framework/Versions/
2.5/lib/python2.5/encodings/utf_8.pyc

Can you please tell me how to fix it?

And why I am seeing a lot of 'install' message' when i run 'python -
v'? I don't think I see that many
install message on linux.

Here is the full message.  Thanks for any help.

$ python -v
# installing zipimport hook
import zipimport # builtin
# installed zipimport hook
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/site.pyc matches /System/Library/Frameworks/Python.framework/
Versions/2.5/lib/python2.5/site.py
import site # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/site.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/os.pyc matches /System/Library/Frameworks/Python.framework/
Versions/2.5/lib/python2.5/os.py
import os # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/os.pyc
import posix # builtin
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/posixpath.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/posixpath.py
import posixpath # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/posixpath.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/stat.pyc matches /System/Library/Frameworks/Python.framework/
Versions/2.5/lib/python2.5/stat.py
import stat # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/stat.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/UserDict.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/UserDict.py
import UserDict # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/UserDict.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/copy_reg.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/copy_reg.py
import copy_reg # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/copy_reg.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/types.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/types.py
import types # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/types.pyc
import _types # builtin
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/warnings.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/warnings.py
import warnings # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/warnings.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/linecache.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/linecache.py
import linecache # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/linecache.pyc
import encodings # directory /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/encodings
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/encodings/__init__.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/encodings/__init__.py
import encodings # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/encodings/__init__.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/codecs.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/codecs.py
import codecs # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/codecs.pyc
import _codecs # builtin
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/encodings/aliases.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/encodings/aliases.py
import encodings.aliases # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/encodings/aliases.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/encodings/utf_8.pyc has bad mtime
import encodings.utf_8 # from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/encodings/utf_8.py
# can't create /System/Library/Frameworks/Python.framework/Versions/
2.5/lib/python2.5/encodings/utf_8.pyc
Python 2.5.1 (r251:54863, Jan 13 2009, 10:26:13)
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
dlopen("/System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/lib-dynload/readline.so", 2);
import readline # dynamically loaded from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/lib-dynload/readline.so
>>> quit



From paul.sijben at xs4all.nl  Tue May  5 12:43:57 2009
From: paul.sijben at xs4all.nl (Paul Sijben)
Date: Tue, 05 May 2009 18:43:57 +0200
Subject: desperately looking for a howto on running my wxPython app on
	Vista
In-Reply-To: <fb1229dc-1fd9-49c7-8b21-5c4326b53c93@u39g2000pru.googlegroups.com>
References: <49f6d607$0$199$e4fe514c@news.xs4all.nl>
	<mailman.4711.1240940347.11746.python-list@python.org>
	<mailman.4750.1240996642.11746.python-list@python.org>
	<fb1229dc-1fd9-49c7-8b21-5c4326b53c93@u39g2000pru.googlegroups.com>
Message-ID: <4A006CCD.5060901@xs4all.nl>

Mike Driscoll wrote:
> On Apr 29, 4:17 am, Paul Sijben <paul.sij... at xs4all.nl> wrote:

>> Is there any way to check which is the offending pyd/dll?  (normally
>> Vista does not give out much data on what went wrong)
>>
>> Paul
> 
> You might be able to find it using the Dependency Walker utility:
> 
> http://www.dependencywalker.com/

Mike, thanks! That spotted indeed some issues with one specific file:
SHLWAPI.DLL, now let's see what is the issue. The report from Dependency
 Walker:"Warning: At least one module has an unresolved import due to a
missing export function in a delay-load dependent module." is not
telling me much at this moment. The FAQ from Dependency Walker sais this
  is not a major issue, but apparently on Vista it is ?!?

Does anyone have a clue what I am to do about this?

Interestingly On WinXP it flags DWMAPI.DLL as missing. I did not spot
that on the Vista box.

Paul

> 
> - Mike


From emile at fenx.com  Tue May  5 13:11:08 2009
From: emile at fenx.com (Emile van Sebille)
Date: Tue, 05 May 2009 10:11:08 -0700
Subject: list comprehension question
In-Reply-To: <85ljpb8r1o.fsf@agentultra.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>	<85ocucnbce.fsf@agentultra.com>	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
Message-ID: <gtprro$c8m$1@ger.gmane.org>

On 5/5/2009 9:15 AM J Kenneth King said...

> List comprehensions can make a reader of your code apprehensive
> because it can read like a run-on sentence and thus be difficult to
> parse. The Python documentation discourages their use and I believe
> for good reason.

Can you provide a link for this?  I'd like to see specifically what's 
being discouraged, as I'd be surprised to find routine usage frowned upon.

Emile



From jcd at sdf.lonestar.org  Tue May  5 13:11:43 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Tue, 05 May 2009 13:11:43 -0400
Subject: for with decimal values?
In-Reply-To: <e9939643-a961-4a85-9436-2f9e6a1b0fbd@y33g2000prg.googlegroups.com>
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
	<op.utdo7jajx6zn5v@gabriel.sleipnir-bsas>
	<mailman.5022.1241401297.11746.python-list@python.org>
	<e9939643-a961-4a85-9436-2f9e6a1b0fbd@y33g2000prg.googlegroups.com>
Message-ID: <1241543503.6816.9.camel@aalcdl07>

On Sun, 2009-05-03 at 19:48 -0700, alex23 wrote:
> On May 4, 11:41 am, Esmail <ebo... at hotmail.com> wrote:
> > All this discussion makes me wonder if it would be a good idea
> > for Python to have this feature (batteries included and all) - it
> > would have its uses, no?
> 
> Well, sometimes more discussion == less consensus :)
> 
> But it's really easy to roll your own:
> 
> from decimal import Decimal
> 
> def args2dec(fn):
>     '''*args to Decimal decorator'''
>     float2dec = lambda f: Decimal(str(f))
>     def _args2dec(*args):
>         args = map(float2dec, args)
>         return fn(*args)
>     return _args2dec
> 
> @args2dec
> def drange(start, stop, step):
>     while start < stop:
>         yield start
>         start += step

I'd prefer not to force my users into using the Decimal type.  Maybe
float fits their needs better.  So here's a generalized xrange
replacement, which fixes an error in the drange implementation above
(try it with a negative step).  It's also highly *not* optimized.
Calculating i * step every time slows it down.  Speeding it back up is
an exercise for the reader.

def general_xrange(start, stop, step=1):
    target = stop * step
    if start * step > target:
        raise ValueError
    i = start
    while i * step < target:
        yield i
        i += step

Cheers,
Cliff




From georgeoliverGO at gmail.com  Tue May  5 13:28:43 2009
From: georgeoliverGO at gmail.com (George Oliver)
Date: Tue, 5 May 2009 10:28:43 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5107.1241539316.11746.python-list@python.org>
Message-ID: <2af0b836-b3a0-46d5-bf6c-9629614bbccd@d2g2000pra.googlegroups.com>

On May 5, 9:01 am, Chris Rebert <c... at rebertia.com> wrote:
> On Tue, May 5, 2009 at 8:52 AM, George Oliver <georgeolive... at gmail.com> wrote:

> > I create instances of these classes in a list attached to a third,
> > 'brain' class.
>
> You could exploit Python's dynamism by using the getattr() function:


Thanks for the responses -- I should have mentioned that I looked at
the getattr() function, but as I instantiate the key handler and
command handler classes in a list (like handlers = [command_handler(),
keyboard_handler()], I'm unsure how to reference that class instance
in the getattr in a straightforward way (short of keeping track of
each instance's position in the handlers list). Is there a typical way
of doing that?



From google at mrabarnett.plus.com  Tue May  5 13:33:58 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 05 May 2009 18:33:58 +0100
Subject: Code works fine except...
In-Reply-To: <fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>	<mailman.5023.1241407766.11746.python-list@python.org>	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com>
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com>
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com>
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com>
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com>
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com>
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com>
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>
Message-ID: <4A007886.5010703@mrabarnett.plus.com>

Ross wrote:
> On May 5, 12:32 am, John Yeung <gallium.arsen... at gmail.com> wrote:
>> On May 5, 1:12 am, John Yeung <gallium.arsen... at gmail.com> wrote:
>>
>>> [...] the problem may require bigger guns (either much better
>>> math or much more sophisticated programming).
>> Yes, I'm responding to myself.
>>
>> Well, I went ahead with the approach I mentioned earlier, generating
>> all possible matches and then selecting among them as needed to fill
>> up the courts, trying to keep the number of matches played by each
>> player as fair as possible.  (I should mention that this, or something
>> similar, was suggested earlier by someone else in a different thread,
>> in response to the same question by the same OP.)
>>
>> I did use "bigger guns" (mainly a class for player objects, with
>> custom __cmp__ method), but still didn't do anything with doubles.
>>
>> I haven't tested it much, but I'll post it if anyone's interested.
>> (That way people can pick on me instead of the OP. ;)
>>
>> John
> 
> I'm interested to see what you did. From your description, it sounds
> like I've tried what you've done, but when I implemented my version,
> it took minutes to evaluate for bigger numbers. If that isn't the case
> with yours, I'd be interested in seeing your implementation.
> 
Here's my approach (incomplete):

def get_pair(player_list, played):
     for first in range(len(player_list)):
         player_1 = player_list[first]
         for second in range(first + 1, len(player_list)):
             player_2 = player_list[second]
             pair = player_1, player_2
             sorted_pair = tuple(sorted(pair))
             if sorted_pair not in played:
                 played.add(sorted_pair)
                 del player_list[second]
                 del player_list[first]
                 return pair
     return None

def round_robin(player_list, courts, played):
     playing = []
     for c in range(courts):
         pair = get_pair(player_list, played)
         if pair is None:
             break
         playing.append(pair)
     byes = player_list[:]
     player_list[:] = byes + [player for pair in playing for player in pair]
     yield playing, byes

def test_round_robin(players, rounds, courts, doubles=False):
     player_list = range(players)
     played = set()
     for r in range(rounds):
         for playing, byes in round_robin(player_list, courts, played):
             print playing, byes



From minesh at gmail.com  Tue May  5 13:39:59 2009
From: minesh at gmail.com (Minesh Patel)
Date: Tue, 5 May 2009 10:39:59 -0700
Subject: Is there is any way to send messages to chunk of emails ID's 
	concurrently using smptlib
In-Reply-To: <m27i0woa5j.fsf@cs.uu.nl>
References: <17ea2ba6-3f5d-4e7e-b05b-6d91dfbc5b36@k19g2000prh.googlegroups.com>
	<m27i0woa5j.fsf@cs.uu.nl>
Message-ID: <b804d5d90905051039n52001db6j5fd6e2a7aa57abb1@mail.gmail.com>

On Mon, May 4, 2009 at 2:01 PM, Piet van Oostrum <piet at cs.uu.nl> wrote:
>>>>>> gganesh <ganesh.gbg at gmail.com> (g) wrote:
>
>>g> Hi friends,
>>g> I suppose sendmail() can send mails one by one ,how to send mails
>>g> concurrently ,
>>g> It would be very grateful,if someone could point out a solution.
>

You can always use twisted which has an smtp library which is used for
concurrency. Not a complete working example but an understanding of
deferreds is required.

Ex:

from twisted.mail import smtp
from twisted.internet import reactor, defer

  def sendEmail(to, message, subject="Testing",
                 _from='foo at bar.com'):
      """Used to send emails asyncronously to multiple recipients"""
      msg = MIMEText(message)
      msg['Subject'] = subject
      msg['From'] = _from
      msg['To'] = ", ".join(to)

      sending = smtp.sendmail('localhost', _from, to, msg)
      sending.addCallback(sendComplete, to).addErrback(sendFailed)

   def sendFailed(error):
      print "Email failed: %r" % (error.getTraceback(),)

   def sendComplete(result, recipients):
      numDelivered, addrInfo = result
      print addrInfo
      if (numDelivered != len(recipients)):
         log.msg(SmtpError, "Not all recipients received email %r" % addrInfo)

buf = 'TESTING'
sendEmail(to=['to at spam.com'], message=buf)


-- 
Thanks,
./Minesh


From jcd at sdf.lonestar.org  Tue May  5 13:43:32 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Tue, 05 May 2009 13:43:32 -0400
Subject: list comprehension question
In-Reply-To: <49FB2AA7.6020403@snet.net>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>
	<49FB2225.4030601@councilforeconed.org>  <49FB2AA7.6020403@snet.net>
Message-ID: <1241545412.12966.3.camel@aalcdl07>

On Fri, 2009-05-01 at 13:00 -0400, John Posner wrote:
> Shane Geiger wrote:
> >    if type(el) == list or type(el) is tuple:
> A tiny improvement:
> 
>         if type(el) in (list, tuple):
> 

Another alternative, which might be useful in some cases:

          if hasattr(el, '__iter__'):

This covers all iterables, not just lists and tuples.  

So:

>>> flatten([1,2, xrange(3,15), 15, 16])
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]

The downside, of course, is that some iterables might be infinite (such
as count), which would cause hidden breakage.  But if you have one of
those in your data structure, why are you trying to flatten it anyway?


Cheers,
Cliff




From murali.au at gmail.com  Tue May  5 13:43:58 2009
From: murali.au at gmail.com (Murali kumar)
Date: Tue, 5 May 2009 23:13:58 +0530
Subject: help for documentation and license
Message-ID: <e4419f3f0905051043g7dba21e0wc398556db94d346a@mail.gmail.com>

hi all..

I finished my application using python 2.6 and wxpython 2.8.9

>> I want to generate documentation for my application..
      please suggest me and provide links to generate documents in easy
way..

>> I want to host my product as open source.. I'dont know about licensing..
      help me for this also..


Advanced Thanks ..
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From jcd at sdf.lonestar.org  Tue May  5 14:01:02 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Tue, 05 May 2009 14:01:02 -0400
Subject: list comprehension question
In-Reply-To: <85ljpb8r1o.fsf@agentultra.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
Message-ID: <1241546462.12966.20.camel@aalcdl07>

On Tue, 2009-05-05 at 12:15 -0400, J Kenneth King wrote:
> Emile van Sebille <emile at fenx.com> writes:
> 
> > On 5/1/2009 7:31 AM J Kenneth King said...
> >> Chris Rebert <clp2 at rebertia.com> writes:
> >>> b = []
> >>> for pair in a:
> >>>     for item in pair:
> >>>         b.append(item)
> >>
> >> This is much more clear than a nested comprehension.
> >>
> >> I love comprehensions, but abusing them can lead to really dense and
> >> difficult to read code.
> >
> > I disagree on dense and difficult, although I'll leave open the
> > question of abuse.
> 
> Dense and difficult may be subjective to people like you or I, but you
> left out the "to read" part of that sentence. I was referring to the
> negative effect nested or complex list comprehensions can have on
> readability.
> 
> > b = [ item for pair in a for item in pair ]
> 
> It's a clever statement, but use it once and its gone. Why not use the
> expanded form in a function definition and get an even shorter, but
> clearer statement?
> 

It's also not obvious what it means.  I would have thought the proper
incantation would be:

[item for item in pair for pair in a]

but that returns [5,5,5,6,6,6].  I still haven't figured out why.  The
way you have to bounce your eyes back and forth in the comprehension
makes it hard to read the logic.  With the loop, on the other hand it is
blatantly obvious which way the nesting occurs.



>
> >>> b = flatten(a)
> 
> Boom, done.
> 
> > This is exactly the code above expressed in comprehension form.
> >
> > It's worth knowing that a list comprehension is structured identically
> > to the equivalent for loop.  So it really is neither more dense nor
> > more difficult to read.  Further, you can tell immediately from the
> > start of the list comprehension what you've got -- in this case a list
> > of item(s).

Empirically, I'd have to disagree with you.  The structure is changed by
the fact that "item" gets put at the beginning of the comprehension.
With the loop, each variable gets introduced in a for statement, and
then used.  With the list comprehension, "item" gets used at the
beginning, and then assigned to in the for expression at the end.
Meanwhile, pair gets introduced as the loop variable in the first for
expression, and iterated over in the second for expression.  So do you
read it left to right or right to left?  Neither.  You have to hold the
whole expression in your mind at once.  Good for short and simple
comprehensions, bad as they get more complicated.

 
> >
> > Here with some slight changes...
> >
> >>>> a = [(1, 2), (3, 4, 7), (5, 6)]
> >>>> [ item for j in a if len(j)==2 for item in j if item % 2 ]
> > [1, 5]
> >

This, to me, looks like line noise, approaching perl in its
unreadability.


> > ...opposed to...
> >
> >>>> for j in a:
> > ...     if len(j)==2:
> > ...         for item in j:
> > ...             if item % 2:
> > ...                 b.append(item)
> > ...
> >>>> b
> > [1, 5]
> >>>>
> 

Much nicer.  Thank you.

> Thanks for the lesson in list comprehensions, but I'm well aware of
> how they work.
> 
> List comprehensions can make a reader of your code apprehensive
> because it can read like a run-on sentence and thus be difficult to
> parse. The Python documentation discourages their use and I believe
> for good reason. It's much easier to explain complex processes with a
> function rather than a single nested statement.
> 
> >
> > YMMV,
> >
> > Emile
> 
> It will apparently vary greatly. Depending on how much coffee I've
> had.
> 
> ;)
> 
> J
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From mccredie at gmail.com  Tue May  5 14:04:00 2009
From: mccredie at gmail.com (Matimus)
Date: Tue, 5 May 2009 11:04:00 -0700 (PDT)
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
Message-ID: <95543497-5eea-4804-9b41-e6a7e842961f@u9g2000pre.googlegroups.com>

On May 5, 9:25?am, Nick <nic... at gmail.com> wrote:
> On May 5, 5:19?pm, Tim Golden <m... at timgolden.me.uk> wrote:
>
>
>
> > Nick wrote:
> > > I have a requirement to read a CSV file. Normally, no problem, just
> > > import CSV and slurp the file up.
>
> > > However, in this case I want to filter out lines that have fields set
> > > to particular values.
>
> > > It would be neat to be able to do something like this.
>
> > > select * from test.csv where status <> "Canceled"
>
> > > Using adodb I can do this, so long as I don't have the where clause. :-
> > > (
>
> > > Is there a reasonable lightweight way of doing this in Python?
>
> > > I could write some python code that is used to filter rows, and inport
> > > that from config, but it's not quite as elegant as an SQL route.
>
> > Not entirely clear what you are and aren't prepared to try here, but...
> > the most obvious Python-based way to do this is treating the csv reader
> > as an iterator and filtering there. Your last line suggests that's not
> > what you want but just in case I've misunderstood:
>
> > <test.csv>
> > id,code,status
> > 1,"ONE","Active"
> > 2,"TWO","Cancelled"
> > 3,"THREE","Active"
> > </test.csv>
>
> > <code>
> > import csv
>
> > for row in csv.DictReader (open ("c:/temp/test.csv", "rb")):
> > ? if row['status'] != 'Cancelled':
> > ? ? print row
>
> > </code>
>
> > Doesn't seem too onerous, and could obviously be wrapped in
> > some useful class/module.
>
> > But if you really want to go the SQL route, I believe there are
> > ODBC adapters for CSV which, combined with PyODBC or CeODBC,
> > would probably take you where you want to go.
>
> > TJG
>
> Part of the problem is that the 'selection' needs to be in a config
> file. I can put the if row['status'] != 'Cancelled': return True into
> a config, read it and eval it, but its not quite as clean as an sql
> route.
>
> Nick

Well, if you are using 2.5.x you could always stuff it into a sqlite
in-memory database, and then execute a SQL query. Heck, you don't even
_need_ 2.5, but in 2.5 sqlite is part of the distribution.

Matt


From gokhansever at gmail.com  Tue May  5 14:30:22 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Tue, 5 May 2009 13:30:22 -0500
Subject: help for documentation and license
In-Reply-To: <e4419f3f0905051043g7dba21e0wc398556db94d346a@mail.gmail.com>
References: <e4419f3f0905051043g7dba21e0wc398556db94d346a@mail.gmail.com>
Message-ID: <49d6b3500905051130r1e8406fg470c6d584710558a@mail.gmail.com>

Hi,

Even though I don't know what your project does, you will need to use
"Sphinx" to create semi-automatic documentation out of your project.

I would recommend you to take a look a quality "free" Python module:
Matplotlib (http://matplotlib.sourceforge.net/index.html)
Go ahead, and check out the main svn trunk. There you will see all
what you need about documentation creation with Sphinx.

Good luck...

G?khan



On Tue, May 5, 2009 at 12:43 PM, Murali kumar <murali.au at gmail.com> wrote:
> hi all..
>
> I finished my application using python 2.6 and wxpython 2.8.9
>
>>> I want to generate documentation for my application..
> ????? please suggest me and provide links to generate documents in easy
> way..
>
>>> I want to host my product as open source.. I'dont know about licensing..
> ????? help me for this also..
>
>
> Advanced Thanks ..
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From debatem1 at gmail.com  Tue May  5 14:45:34 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 5 May 2009 11:45:34 -0700 (PDT)
Subject: help for documentation and license
References: <e4419f3f0905051043g7dba21e0wc398556db94d346a@mail.gmail.com> 
	<mailman.5116.1241548225.11746.python-list@python.org>
Message-ID: <7b470dd7-ff66-46ba-859f-2a81603ae745@r34g2000vbi.googlegroups.com>

On May 5, 2:30?pm, G?khan SEVER <gokhanse... at gmail.com> wrote:
> Hi,
>
> Even though I don't know what your project does, you will need to use
> "Sphinx" to create semi-automatic documentation out of your project.
>
> I would recommend you to take a look a quality "free" Python module:
> Matplotlib (http://matplotlib.sourceforge.net/index.html)
> Go ahead, and check out the main svn trunk. There you will see all
> what you need about documentation creation with Sphinx.
>
> Good luck...
>
> G?khan
>
> On Tue, May 5, 2009 at 12:43 PM, Murali kumar <murali... at gmail.com> wrote:
> > hi all..
>
> > I finished my application using python 2.6 and wxpython 2.8.9
>
> >>> I want to generate documentation for my application..
> > ????? please suggest me and provide links to generate documents in easy
> > way..
>
> >>> I want to host my product as open source.. I'dont know about licensing..
> > ????? help me for this also..

You can autogenerate API docs using pydoc (builtin, usually ugly) or
epydoc
(external, not so ugly), or you can use a project like sphinx for hand
written docs.

As far as hosting goes, sourceforge is usually the way to go, although
I'm
a huge fan of gitorious (in fact, wrote a recipe to autogenerate API
docs
for markdown <URL: http://code.activestate.com/recipes/576733/>) but
you
have to be using git for it to work. Github is another choice. If
that's
the case.

As far as licensing goes, you have a *LOT* of options, so you may want
to
check out <URL: http://en.wikipedia.org/wiki/Comparison_of_free_software_licenses>

Geremy Condra



From stefan_ml at behnel.de  Tue May  5 14:46:45 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 05 May 2009 20:46:45 +0200
Subject: thc v0.3 - txt to html converter - better code?
In-Reply-To: <gtppqc$7v1$1@news-cedar.fernuni-hagen.de>
References: <gtppqc$7v1$1@news-cedar.fernuni-hagen.de>
Message-ID: <4a008996$0$31862$9b4e6d93@newsspool3.arcor-online.net>

Florian Wollenschein wrote:
> here's some code of thc, my txt to html converter programmed with Python
> and pyQT4:
> -------------------------------------------------------------------------------
> 
> if self.rdioBtnTransitional.isChecked():
>             if self.cmboBoxLang.currentText() == "English":
>                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML
> 4.0 Transitional//EN">' + '\n')
>             elif self.cmboBoxLang.currentText() == "German":
>                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML
> 4.0 Transitional//DE">' + '\n')
>         else:
>             file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0
> Strict//EN">' + '\n')
>             if self.cmboBoxLang.currentText() == "English":
>                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML
> 4.0 Strict//EN">' + '\n')
>             elif self.cmboBoxLang.currentText() == "German":
>                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML
> 4.0 Strict/DE">' + '\n')
> --------------------------------------------------------------------------------
> 
> 
> Do you have any ideas for a better code than that? Could this be done
> smarter, shorter, whatever!?

I assume you are referring to the code duplication above. You can build the
string incrementally instead, e.g.

    language_map = {'English': 'EN', 'Deutsch': 'DE'}
    strict_or_transitional = {True: 'Transitional', False: 'Strict'}

    # this will raise a KeyError for unknown languages
    language = language_map[ self.cmboBoxLang.currentText() ]

    # this assumes that isChecked() returns True or False
    spec = strict_or_transitional[self.rdioBtnTransitional.isChecked()]

    doctype = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 %s/%s">\n' % (
        spec, language)

Stefan


From kyosohma at gmail.com  Tue May  5 14:57:12 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 5 May 2009 11:57:12 -0700 (PDT)
Subject: desperately looking for a howto on running my wxPython app on 
	Vista
References: <49f6d607$0$199$e4fe514c@news.xs4all.nl>
	<mailman.4711.1240940347.11746.python-list@python.org> 
	<mailman.4750.1240996642.11746.python-list@python.org>
	<fb1229dc-1fd9-49c7-8b21-5c4326b53c93@u39g2000pru.googlegroups.com>
	<4A006CCD.5060901@xs4all.nl>
Message-ID: <1f97707a-9fd8-45d0-8aa6-142ce16b1951@e24g2000vbe.googlegroups.com>

On May 5, 11:43?am, Paul Sijben <paul.sij... at xs4all.nl> wrote:
> Mike Driscoll wrote:
> > On Apr 29, 4:17 am, Paul Sijben <paul.sij... at xs4all.nl> wrote:
> >> Is there any way to check which is the offending pyd/dll? ?(normally
> >> Vista does not give out much data on what went wrong)
>
> >> Paul
>
> > You might be able to find it using the Dependency Walker utility:
>
> >http://www.dependencywalker.com/
>
> Mike, thanks! That spotted indeed some issues with one specific file:
> SHLWAPI.DLL, now let's see what is the issue. The report from Dependency
> ?Walker:"Warning: At least one module has an unresolved import due to a
> missing export function in a delay-load dependent module." is not
> telling me much at this moment. The FAQ from Dependency Walker sais this
> ? is not a major issue, but apparently on Vista it is ?!?
>
> Does anyone have a clue what I am to do about this?
>
> Interestingly On WinXP it flags DWMAPI.DLL as missing. I did not spot
> that on the Vista box.
>
> Paul
>
>
>
> > - Mike

Hmmm...I'm not familiar with that DLL, but a little googling seems to
indicate that you may be able to get it off your installation CD:

http://www.techimo.com/forum/applications-operating-systems/76550-winxp-msgina-dll-shlwapi-dll-problem.html

The link above gives the steps for XP, but Vista will probably be
similar. I don't know for sure, but you may have to register the dll
once you've got it copied back onto your machine.

Mike


From davea at ieee.org  Tue May  5 14:59:21 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 05 May 2009 14:59:21 -0400
Subject: call function of class instance with no assigned name?
In-Reply-To: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
Message-ID: <4A008C89.8090503@ieee.org>

George Oliver wrote:
> hi, I'm a Python beginner with a basic question. I'm writing a game
> where I have keyboard input handling defined in one class, and command
> execution defined in another class. The keyboard handler class
> contains a dictionary that maps a key to a command string (like 'h':
> 'left') and the command handler class contains functions that do the
> commands (like def do_right(self):),
>
> I create instances of these classes in a list attached to a third,
> 'brain' class. What I'd like to have happen is when the player presses
> a key, the command string is passed to the command handler, which runs
> the function. However I can't figure out a good way to make this
> happen.
>
> I've tried a dictionary mapping command strings to functions in the
> command handler class, but those dictionary values are evaluated just
> once when the class is instantiated. I can create a dictionary in a
> separate function in the command handler (like a do_command function)
> but creating what could be a big dictionary for each input seems kind
> of silly (unless I'm misunderstanding something there).
>
> What would be a good way to make this happen, or is there a different
> kind of architecture I should be thinking of?
>
>   
You have lots of words, but no code, and no explanation of why you're 
choosing this "architecture."  So it's unclear just what to propose to 
you, without sticking to generalities.

1) forget about getattr() unless you have hundreds of methods in your 
map.  The real question is why you need two maps. What good is the 
"command string" doing you?   Why not just map the keyvalues directly 
into function objects?

2) Look at the following simple example, where I'm assuming that a 
"keycode" is simply an ASCII character.

class Command(object):
    def __init__(self):
        pass
    def doEnter(self):
        print "Enter is done"
    def doA(self):
        print "A is done"

cmd = Command()



table = {
    13: cmd.doEnter,
    65: cmd.doA
}

print "trying 13"
key = 13
table[key]()
print "trying 65"
key = 65
table[key]()

3) As for rebuilding the dictionary, that just depends on where you 
build it, and what it's lifetime is.  If it's got enough lifetime, and 
appropriate scope, you wouldn't have to rebuild anything.

4) Code up a first try, and when you get stuck, ask a specific question.

You said you're a beginner.  So keep it as simple as possible.l



From http  Tue May  5 15:01:39 2009
From: http (Paul Rubin)
Date: 05 May 2009 12:01:39 -0700
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
	<pan.2009.05.05.03.22.33@REMOVE.THIS.cybersource.com.au>
	<37e0021f-b50c-4f0c-8ba5-0beed01da029@z16g2000prd.googlegroups.com>
	<pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>
Message-ID: <7xhbzzz84s.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
> def rvisit(node):
>     print node
>     if node and node.link is not None:
>         rvisit(node.link)

Less redundant (remember the extra "recursion" doesn't cost anything
if the compiler is sane enough to turn it into a jump):

 def rvisit(node):
     print node
     if node:
         rvisit(node.link)


From chambon.pascal at wanadoo.fr  Tue May  5 15:05:15 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Tue, 05 May 2009 21:05:15 +0200
Subject: Which one is best Python or Java for developing GUI applications?
In-Reply-To: <50697b2c0905050228l5fee0351re35f61f0fe9d35ab@mail.gmail.com>
References: <mailman.5092.1241505670.11746.python-list@python.org>	<7xfxfkvwra.fsf@ruckus.brouhaha.com>
	<87d4ao9fi7.fsf@rudin.co.uk>
	<50697b2c0905050228l5fee0351re35f61f0fe9d35ab@mail.gmail.com>
Message-ID: <4A008DEB.80607@wanadoo.fr>

Chris Rebert a ?crit :
> On Tue, May 5, 2009 at 12:26 AM, Paul Rudin <paul.nospam at rudin.co.uk> wrote:
>   
>> Paul Rubin <http://phr.cx at NOSPAM.invalid> writes:
>>
>>     
>>> srinivasan srinivas <sri_annauni at yahoo.co.in> writes:
>>>       
>>>> Could you tell me does Python have any advantages over Java for the
>>>> development of GUI applications?
>>>>         
>>> Yes.
>>>       
>> Clearly c.l.p needs to adopt the SNB <http://cam.misc.org.uk/snb>
>> convention :)
>>     
>
> Surely you have forgotten the comedy style of the language's namesake,
> which makes that rule completely inadmissible! ;P
>
> Cheers,
> Chris
>   

The fact that Python is a dynamic language offers, in my opinion, a huge 
advantage to quickly setup a GUI, without caring about the infinite 
details of the variable types and function signatures.
Its good handling of "function as first-class objects" is also precious 
when comes the time of setting callbacks (I can't bear anymore the way 
Swing does it, with interfaces etc.)

But much depends on the framework used, too. I've used wxPython for a 
multimedia project, and actually it lacked a lot of necessary features 
(transparency, event loop tuning, multithreading support...), but that 
was 1 year ago, maybe things have changed.
Anyway, I'd advocate the use of PyQt, which really offers tremendous 
possibilities - if your application isn't a simple office application, 
its' really worth turning towards pyqt.

Regards,
Pascal
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From a.cavallo at cavallinux.eu  Tue May  5 15:06:17 2009
From: a.cavallo at cavallinux.eu (A. Cavallo)
Date: Tue, 5 May 2009 20:06:17 +0100
Subject: Numpy on python 2.7a
Message-ID: <200905052006.17708.a.cavallo@cavallinux.eu>

Hi,

I'm trying to compile numpy using my own pet project based on the python svn 
code (that's the reason for the 2.7a tag).

It is essentially a /opt python installation and it tailored for linux: its 
main goal is to be installed in parallel so it won't collide with a system 
installed python (this won't impact the sys admin work).

The rpms built so far can be found under:

http://download.opensuse.org/repositories/home:/cavallo71:/python-opt/

It includes several patches both stolen from other sources, some made by 
myself (at some point I plan to do the same for debian based distributions 
when I'll have some spare time) and it contains a smoke test to verify the 
build is ok.

The user willing to activate the "opt-python" has to just source the 
file /opt/opt-python-2.7a0/opt-python-env.sh and he/she will have a fully 
working python (in this way there could be several different python version 
at the same time).

So far so good, I've been able to compile the python imaging library, but it 
fails to compile numpy.

The message I'm receiving is:


============
/opt/opt-python-2.7a0/include/python2.7/pyconfig.h:127:1: warning: this is the 
location of the previous definition
ar: adding 1 object files to build/temp.linux-i686-2.7/libnpymath.a
ar: illegal option -- /
Usage: ar [emulation options] [-]{dmpqrstx}[abcfilNoPsSuvV] [member-name] 
[count] archive-file file...
       ar -M [<mri-script]
 commands:
  d            - delete file(s) from the archive
  m[ab]        - move file(s) in the archive
  p            - print file(s) found in the archive
  q[f]         - quick append file(s) to the archive
  r[ab][f][u]  - replace existing or insert new file(s) into the archive
  t            - display contents of archive
  x[o]         - extract file(s) from the archive
 command specific modifiers:
  [a]          - put file(s) after [member-name]
  [b]          - put file(s) before [member-name] (same as [i])
  [N]          - use instance [count] of name
  [f]          - truncate inserted file names
  [P]          - use full path names when matching
  [o]          - preserve original dates
  [u]          - only replace files that are newer than current archive 
contents
 generic modifiers:
  [c]          - do not warn if the library had to be created
  [s]          - create an archive index (cf. ranlib)
  [S]          - do not build a symbol table
  [T]          - make a thin archive
  [v]          - be verbose
  [V]          - display the version number
  @<file>      - read options from <file>
 emulation options:
  No emulation specific options
ar: supported targets: elf32-i386 a.out-i386-linux efi-app-ia32 efi-bsdrv-ia32 
efi-rtdrv-ia32 elf32-little elf32-big elf64-alpha ecoff-litt
lealpha elf64-little elf64-big elf32-littlearm elf32-bigarm elf32-hppa-linux 
elf32-hppa elf64-hppa-linux elf64-hppa elf64-x86-64 elf64-ia64
-little elf64-ia64-big efi-app-ia64 efi-bsdrv-ia64 efi-rtdrv-ia64 elf32-m68k 
a.out-m68k-linux elf32-tradbigmips elf32-tradlittlemips ecoff-
bigmips ecoff-littlemips elf32-ntradbigmips elf64-tradbigmips 
elf32-ntradlittlemips elf64-tradlittlemips elf32-powerpc aixcoff-rs6000 elf32
-powerpcle ppcboot elf64-powerpc elf64-powerpcle aixcoff64-rs6000 elf32-s390 
elf64-s390 elf32-sh-linux elf32-shbig-linux elf32-sparc a.out-
sparc-linux elf64-sparc a.out-sunos-big efi-app-x86_64 efi-bsdrv-x86_64 
efi-rtdrv-x86_64 mach-o-le mach-o-be mach-o-fat pef pef-xlib sym sr
ec symbolsrec tekhex binary ihex trad-core
ar: illegal option -- /
Usage: ar [emulation options] [-]{dmpqrstx}[abcfilNoPsSuvV] [member-name] 
[count] archive-file file...


============

Is there any way I can increase the output to discover what went wrong?

Best regards,
Antonio Cavallo


From georgeoliverGO at gmail.com  Tue May  5 15:17:23 2009
From: georgeoliverGO at gmail.com (George Oliver)
Date: Tue, 5 May 2009 12:17:23 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5117.1241549976.11746.python-list@python.org>
Message-ID: <ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>

On May 5, 11:59 am, Dave Angel <da... at ieee.org> wrote:

> 1) forget about getattr() unless you have hundreds of methods in your
> map.  The real question is why you need two maps. What good is the
> "command string" doing you?   Why not just map the keyvalues directly
> into function objects?


Thanks for the reply Dave. I understand your example and it's what I
originally used. Here is more detail on what I'm doing now, I hope
this will explain my question better.

In the game I'm writing the player, monsters, items and so on are
instances of class Thing, like:

class Thing(object):
    def __init__(self, x, y, name):
        self.x, self.y = x, y
        self.name = name
        self.brain = None

Some Things have an instance of class Brain attached. The Brain
instance has a list of handlers, like:

class Brain(object):
    def __init__(self):
        self.handlers = []

A handler class defines some functionality for the Brain. Each Brain
has an update method like this:

def update(self, arguments):
    for handler in self.handlers:
        handler.update(arguments)

So on each pass through the main game loop, it calls the update method
of all the brains in the game, which run their handler update methods
to change the state of the game.

A handler would be something like a key input handler. The key input
handler is defined separately from the command handler in the case I
want to use a different method of input, for example a mouse or
joystick.

In the dictionary of key inputs I could map each input directly to a
function. However there is no instance name I can call the function
on, as I create a thing, add a brain, and add handlers to the brain
like this:

player = Thing(26, 16, 'player')
player.brain = Brain()
player.brain.add_handlers(
                            commandHandler(player.brain, player),
                            keyboardHandler(player.brain),
                            fovHandler(player.brain))


So what I'm wondering is how to reference the instance in each brain's
list of handlers when I want to map something like a key input to a
command, or what a better way might be to structure the code.








From mail at timgolden.me.uk  Tue May  5 15:27:37 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 05 May 2009 20:27:37 +0100
Subject: SQL and CSV
In-Reply-To: <1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
Message-ID: <4A009329.70608@timgolden.me.uk>

Nick wrote:
> Part of the problem is that the 'selection' needs to be in a config
> file. I can put the if row['status'] != 'Cancelled': return True into
> a config, read it and eval it, but its not quite as clean as an sql
> route.


Still not clear what the restriction is. If you were writing
SQL you'd have to read *something* from your config file,
unless you're suggesting that the "config file" is in fact
a SQL file. Which is one way of doing it, but then you might
just as well have your config file as a Python file and
import it.

Have I missed the point somewhere here? Can you give an
example -- even a fictional one -- of what you couldn't
do using, say, the example I gave earlier?

TJG


From showell30 at yahoo.com  Tue May  5 15:50:41 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 5 May 2009 12:50:41 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com>

On May 4, 11:08?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
>
> I propose a small piece of sugar. When a function is entered, Python
> creates an ordinary local name in the function's local namespace, and
> binds the function itself to that name. Two possibilities for the name
> are `this` or `__this__`, analogous to `self` in methods and `__name__`
> in modules.
>
> If there is any support for this, I propose to send the following (long)
> post to python-ideas. Feedback, corrections and suggestions welcome.
>

I totally support this proposal.   I've definitely wasted time in the
past trying to invent my own workarounds for the use cases you
describe.

Obviously, there will be some bikeshed debates on __this__ vs.
__name__ vs. __func__, etc.  I don't have an opinion there, just want
*something* handy for introspection, DRYness, etc.

A more interesting question is whether __this__ would just always be
there (that's my vote), or if you should have to apply a special
decorator to get it (which I oppose, but I can see some merits).



From kushal.kumaran at gmail.com  Tue May  5 15:51:04 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Wed, 6 May 2009 01:21:04 +0530
Subject: Way to use proxies & login to site?
In-Reply-To: <629c75b1-9e67-44fb-9de0-0a23ff6c306b@v23g2000pro.googlegroups.com>
References: <36bb20c2-2199-42bb-a123-171bf380182c@y10g2000prc.googlegroups.com>
	<629c75b1-9e67-44fb-9de0-0a23ff6c306b@v23g2000pro.googlegroups.com>
Message-ID: <1e364c4e0905051251g7f98c61ds941c9574f589aa65@mail.gmail.com>

On Wed, Apr 29, 2009 at 8:21 AM, inVINCable <inVINCEable667 at gmail.com> wrote:
> On Apr 27, 7:40?pm, inVINCable <inVINCEable... at gmail.com> wrote:
>> Hello,
>>
>> I have been using ClientForm to log in to sites & ClientCookie so I
>> can automatically log into my site to do some penetration testing,
>> although, I cannot figure out a solution to use proxies with this
>> logging in automatically. Does anyone have any solutions?
>>
>> Thanks :)
>>
>> Vince
>
> Any ideas?

If, like the example at http://wwwsearch.sourceforge.net/ClientForm/,
you are using urllib2, you can read the documentation for that module.
 It also has examples for working with proxies.

-- 
kushal


From castironpi at gmail.com  Tue May  5 16:02:47 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 5 May 2009 13:02:47 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com>
Message-ID: <4a69c949-ace7-47d9-8bb7-d05bc6c895f3@s31g2000vbp.googlegroups.com>

On May 5, 2:50?pm, Steve Howell <showel... at yahoo.com> wrote:
> On May 4, 11:08?pm, Steven D'Aprano
>
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>
> > I propose a small piece of sugar. When a function is entered, Python
> > creates an ordinary local name in the function's local namespace, and
> > binds the function itself to that name. Two possibilities for the name
> > are `this` or `__this__`, analogous to `self` in methods and `__name__`
> > in modules.
>
> > If there is any support for this, I propose to send the following (long)
> > post to python-ideas. Feedback, corrections and suggestions welcome.
>
> I totally support this proposal. ? I've definitely wasted time in the
> past trying to invent my own workarounds for the use cases you
> describe.
>
> Obviously, there will be some bikeshed debates on __this__ vs.
> __name__ vs. __func__, etc. ?I don't have an opinion there, just want
> *something* handy for introspection, DRYness, etc.
>
> A more interesting question is whether __this__ would just always be
> there (that's my vote), or if you should have to apply a special
> decorator to get it (which I oppose, but I can see some merits).

Here is how to get the function into the function as an argument, and
still permit recursive calls onto it.

>>> def auto( f ):
...     def _inner( *ar, **kw ):
...             return f( g, *ar, **kw )
...     g= _inner
...     return g
...
>>> @auto
... def f( self, n ):
...     print( self, n )
...     return 1 if n== 1 else n* self( n- 1 )
...
>>> f(7)
<function _inner at 0x00BA0D68> 7
<function _inner at 0x00BA0D68> 6
<function _inner at 0x00BA0D68> 5
<function _inner at 0x00BA0D68> 4
<function _inner at 0x00BA0D68> 3
<function _inner at 0x00BA0D68> 2
<function _inner at 0x00BA0D68> 1
5040

The function that is passed into the function is the decorated
function, not the original.  The decorator function is also returned
from the decorator calls, so both the external caller and the internal
caller are calling the same function, '_inner' in the sample, which
then back-calls the original.

Please stay tuned for the post-graduate lecture.  There will be time
for questions at the cookies-and-creme seminar afterward.


From garylinux at gmail.com  Tue May  5 16:12:17 2009
From: garylinux at gmail.com (justme)
Date: Tue, 5 May 2009 13:12:17 -0700 (PDT)
Subject: AutoComplete in C++ Editor for Python
References: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>
Message-ID: <3746e883-79bc-444c-8b09-641675339954@s20g2000vbp.googlegroups.com>

I the rope project http://rope.sourceforge.net/ has an autocomplete
lib.
(I have not used it  just remember reading about it)


From castironpi at gmail.com  Tue May  5 16:16:39 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 5 May 2009 13:16:39 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5117.1241549976.11746.python-list@python.org>
	<ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
Message-ID: <0c2f0973-1829-46fa-a28c-c38e7906e750@l5g2000vbc.googlegroups.com>

On May 5, 2:17?pm, George Oliver <georgeolive... at gmail.com> wrote:
> On May 5, 11:59 am, Dave Angel <da... at ieee.org> wrote:
>
> > 1) forget about getattr() unless you have hundreds of methods in your
> > map. ?The real question is why you need two maps. What good is the
> > "command string" doing you? ? Why not just map the keyvalues directly
> > into function objects?
>
> Thanks for the reply Dave. I understand your example and it's what I
> originally used. Here is more detail on what I'm doing now, I hope
> this will explain my question better.
>
> In the game I'm writing the player, monsters, items and so on are
> instances of class Thing, like:
>
> class Thing(object):
> ? ? def __init__(self, x, y, name):
> ? ? ? ? self.x, self.y = x, y
> ? ? ? ? self.name = name
> ? ? ? ? self.brain = None
>
> Some Things have an instance of class Brain attached. The Brain
> instance has a list of handlers, like:
>
> class Brain(object):
> ? ? def __init__(self):
> ? ? ? ? self.handlers = []
>
> A handler class defines some functionality for the Brain. Each Brain
> has an update method like this:
>
> def update(self, arguments):
> ? ? for handler in self.handlers:
> ? ? ? ? handler.update(arguments)
>
> So on each pass through the main game loop, it calls the update method
> of all the brains in the game, which run their handler update methods
> to change the state of the game.
>
> A handler would be something like a key input handler. The key input
> handler is defined separately from the command handler in the case I
> want to use a different method of input, for example a mouse or
> joystick.
>
> In the dictionary of key inputs I could map each input directly to a
> function. However there is no instance name I can call the function
> on, as I create a thing, add a brain, and add handlers to the brain
> like this:
>
> player = Thing(26, 16, 'player')
> player.brain = Brain()
> player.brain.add_handlers(
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? commandHandler(player.brain, player),
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? keyboardHandler(player.brain),
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? fovHandler(player.brain))
>
> So what I'm wondering is how to reference the instance in each brain's
> list of handlers when I want to map something like a key input to a
> command, or what a better way might be to structure the code.

I'm not entirely sure I follow, but you may want to try keeping a set
(or list) of handlers that you pass in to the 'add_handlers' function,
and trying the 'getattr( handlerX, keyY )' on each of them, possible
only until you have a success.  You could also cache these results to
avoid performing the same search subsequently.

Otherwise, query each of the passed-in handlers when they are passed
in for a list of events they can handle; this may be by a brute
'getattr( x ) for x in ALL_EVENTS', or by maintaining a list of
handlers on a per-object basis, and merely combining the dictionaries;
then pick one or all of the handlers you've accumulated for an event
when the event occurs.

</run-on sentence>

If you're really trying to be clever, you might use a metaclass or
class decorator to accumulate what events are handled in a class; or
just try the '__dict__' member of the /class/.

Will any of your handlers be handling overlapping or duplicate
events?  Do they all get a crack at it, or do you follow a pre-
deterimend order of precedence, or follow the order in which they were
passed in?

I'd probably try to discourage you from circularly linking the object
and handlers, not only for practical reasons.

There is also the possibility you could use dynamic mix-ins to create
a specialized once-in-a-lifetime brain class:

def create_brain( handlers ):
    class new_brain( Brain ):
        pass
    for x in handlers:
        setattr( new_brain, x.__name__, x )
    return new_brain

brain= create_brain( handlers )( creation_args )

Forgive, just Thing-king aloud.


From duncan.booth at invalid.invalid  Tue May  5 16:19:54 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 May 2009 20:19:54 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com>
	<4a69c949-ace7-47d9-8bb7-d05bc6c895f3@s31g2000vbp.googlegroups.com>
Message-ID: <Xns9C02D8FA81FF2duncanbooth@127.0.0.1>

Aaron Brady <castironpi at gmail.com> wrote:

> Here is how to get the function into the function as an argument, and
> still permit recursive calls onto it.
> 
>>>> def auto( f ):
> ...     def _inner( *ar, **kw ):
> ...             return f( g, *ar, **kw )
> ...     g= _inner
> ...     return g
> ...
>>>> @auto
> ... def f( self, n ):
> ...     print( self, n )
> ...     return 1 if n== 1 else n* self( n- 1 )
> ...
>>>> f(7)
><function _inner at 0x00BA0D68> 7
><function _inner at 0x00BA0D68> 6
><function _inner at 0x00BA0D68> 5
><function _inner at 0x00BA0D68> 4
><function _inner at 0x00BA0D68> 3
><function _inner at 0x00BA0D68> 2
><function _inner at 0x00BA0D68> 1
> 5040
> 

It might be better to use some convention other than 'self' for the first 
argument otherwise it will cause confusion when writing recursive methods:

>>> class C(object):
	@auto
	def meth(this, self, n):
		print this, self, n
		return 1 if n==1 else n*this(self, n-1)

>>> inst = C()
>>> inst.meth(5)
<function _inner at 0x0000000003680198> <__main__.C object at 
0x000000000366C4E0> 5
<function _inner at 0x0000000003680198> <__main__.C object at 
0x000000000366C4E0> 4
<function _inner at 0x0000000003680198> <__main__.C object at 
0x000000000366C4E0> 3
<function _inner at 0x0000000003680198> <__main__.C object at 
0x000000000366C4E0> 2
<function _inner at 0x0000000003680198> <__main__.C object at 
0x000000000366C4E0> 1
120


From ross.jett at gmail.com  Tue May  5 16:25:24 2009
From: ross.jett at gmail.com (Ross)
Date: Tue, 5 May 2009 13:25:24 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
Message-ID: <3a4e6e31-76fd-4a85-8270-a7efbaf2ff1d@o27g2000vbd.googlegroups.com>

On May 5, 1:33?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Ross wrote:
> > On May 5, 12:32 am, John Yeung <gallium.arsen... at gmail.com> wrote:
> >> On May 5, 1:12 am, John Yeung <gallium.arsen... at gmail.com> wrote:
>
> >>> [...] the problem may require bigger guns (either much better
> >>> math or much more sophisticated programming).
> >> Yes, I'm responding to myself.
>
> >> Well, I went ahead with the approach I mentioned earlier, generating
> >> all possible matches and then selecting among them as needed to fill
> >> up the courts, trying to keep the number of matches played by each
> >> player as fair as possible. ?(I should mention that this, or something
> >> similar, was suggested earlier by someone else in a different thread,
> >> in response to the same question by the same OP.)
>
> >> I did use "bigger guns" (mainly a class for player objects, with
> >> custom __cmp__ method), but still didn't do anything with doubles.
>
> >> I haven't tested it much, but I'll post it if anyone's interested.
> >> (That way people can pick on me instead of the OP. ;)
>
> >> John
>
> > I'm interested to see what you did. From your description, it sounds
> > like I've tried what you've done, but when I implemented my version,
> > it took minutes to evaluate for bigger numbers. If that isn't the case
> > with yours, I'd be interested in seeing your implementation.
>
> Here's my approach (incomplete):
>
> def get_pair(player_list, played):
> ? ? ?for first in range(len(player_list)):
> ? ? ? ? ?player_1 = player_list[first]
> ? ? ? ? ?for second in range(first + 1, len(player_list)):
> ? ? ? ? ? ? ?player_2 = player_list[second]
> ? ? ? ? ? ? ?pair = player_1, player_2
> ? ? ? ? ? ? ?sorted_pair = tuple(sorted(pair))
> ? ? ? ? ? ? ?if sorted_pair not in played:
> ? ? ? ? ? ? ? ? ?played.add(sorted_pair)
> ? ? ? ? ? ? ? ? ?del player_list[second]
> ? ? ? ? ? ? ? ? ?del player_list[first]
> ? ? ? ? ? ? ? ? ?return pair
> ? ? ?return None
>
> def round_robin(player_list, courts, played):
> ? ? ?playing = []
> ? ? ?for c in range(courts):
> ? ? ? ? ?pair = get_pair(player_list, played)
> ? ? ? ? ?if pair is None:
> ? ? ? ? ? ? ?break
> ? ? ? ? ?playing.append(pair)
> ? ? ?byes = player_list[:]
> ? ? ?player_list[:] = byes + [player for pair in playing for player in pair]
> ? ? ?yield playing, byes
>
> def test_round_robin(players, rounds, courts, doubles=False):
> ? ? ?player_list = range(players)
> ? ? ?played = set()
> ? ? ?for r in range(rounds):
> ? ? ? ? ?for playing, byes in round_robin(player_list, courts, played):
> ? ? ? ? ? ? ?print playing, byes- Hide quoted text -
>
> - Show quoted text -

Looks like somewhat of an improvement, although the bye distribution
is still slightly lopsided. For example, in a singles league with 12
players, 12 rounds, and 4 courts, The first player had at least 2 less
byes than every other player and 3 less byes than the players with the
most number of byes. Thanks for your input though...I'll look into how
I can improve upon it.


From doctoresam at gmail.com  Tue May  5 16:37:53 2009
From: doctoresam at gmail.com (Deep_Feelings)
Date: Tue, 5 May 2009 13:37:53 -0700 (PDT)
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
	<mailman.5031.1241420740.11746.python-list@python.org>
Message-ID: <81f82d8c-80fa-4ba0-a402-3a8b5757a967@s16g2000vbp.googlegroups.com>

that is good ,thank you

anyone did that ? learning from python docs straight away ?


From bearophileHUGS at lycos.com  Tue May  5 16:43:16 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 5 May 2009 13:43:16 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
Message-ID: <4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>

wolfram.hinde...:
> It is easy to change all references of the function name, except for
> those in the function body itself? That needs some explantation.

I can answer this. If I have a recursive function, I may want to
create a similar function, so I copy and paste it, to later modify the
copied version. Then to change its name I usually don't use a search &
rename of its name into its block of code because it's usually
useless. In non-recursive functions the name of the function is stated
only once, at the top.

Recursive functions violate the DRY principle, that's the root of the
problem.

The auto(f) decorator shown later by Aaron Brady seems the best
solution found so far, it's so nice that it even seems practically
usable.

Bye,
bearophile


From bearophileHUGS at lycos.com  Tue May  5 16:54:44 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 5 May 2009 13:54:44 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com> 
	<4a69c949-ace7-47d9-8bb7-d05bc6c895f3@s31g2000vbp.googlegroups.com>
Message-ID: <50222a39-88d0-49da-9105-2d3a47af5940@r34g2000vba.googlegroups.com>

Aaron Brady:
> >>> def auto( f ):
>
> ... ? ? def _inner( *ar, **kw ):
> ... ? ? ? ? ? ? return f( g, *ar, **kw )
> ... ? ? g= _inner
> ... ? ? return g

Looks nice, I'll try to the following variant to see if it's usable:

def thisfunc(fun):
    """Decorator to inject a default name of a
    function inside a function"""
    def _inner(*args, **kwds):
        return fun(g, *args, **kwds)
    g = _inner
    g.__name__ = fun.__name__
    g.__dict__.update(fun.__dict__)
    g.__doc__ = fun.__doc__
    g.__module__ = fun.__module__
    return g

@thisfunc
def SOMEVERYUGLYNAME(this, n):
    return 1 if n <= 1 else n * this(n - 1)

assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6

Bye,
bearophile


From piet at cs.uu.nl  Tue May  5 17:03:28 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Tue, 05 May 2009 23:03:28 +0200
Subject: Error in running python -v on Mac ox 10.5.
References: <b39ce186-56d3-4dae-84ce-24a7c92bb50a@k9g2000pra.googlegroups.com>
Message-ID: <m2bpq7mfdr.fsf@cs.uu.nl>

>>>>> silverburgh <silverburgh.meryl at gmail.com> (s) wrote:

>s> Hi,

>s> I run 'python -v' on Macos 10.5 but I get this error :
>s> # can't create /System/Library/Frameworks/Python.framework/Versions/
>s> 2.5/lib/python2.5/encodings/utf_8.pyc

>s> Can you please tell me how to fix it?

This looks like the utf_8.py file has not been compiled in the
installation. Looks like a (not serious) bug to me.

Probably sudo python -v would solve it (even without -v, but it will
tell you that it wrote the .pyc file).

>s> And why I am seeing a lot of 'install' message' when i run 'python -
>s> v'? I don't think I see that many
>s> install message on linux.

I don't see 'install' messages in the included text.
>s> Here is the full message.  Thanks for any help.
[deleted]
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From castironpi at gmail.com  Tue May  5 17:20:15 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 5 May 2009 14:20:15 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com> 
	<4a69c949-ace7-47d9-8bb7-d05bc6c895f3@s31g2000vbp.googlegroups.com> 
	<50222a39-88d0-49da-9105-2d3a47af5940@r34g2000vba.googlegroups.com>
Message-ID: <5b81cccc-c174-42bd-b4a0-638755ca9e03@l5g2000vbc.googlegroups.com>

On May 5, 3:54?pm, bearophileH... at lycos.com wrote:
> Aaron Brady:
>
> > >>> def auto( f ):
>
> > ... ? ? def _inner( *ar, **kw ):
> > ... ? ? ? ? ? ? return f( g, *ar, **kw )
> > ... ? ? g= _inner
> > ... ? ? return g
>
> Looks nice, I'll try to the following variant to see if it's usable:
>
> def thisfunc(fun):
> ? ? """Decorator to inject a default name of a
> ? ? function inside a function"""
> ? ? def _inner(*args, **kwds):
> ? ? ? ? return fun(g, *args, **kwds)
> ? ? g = _inner
> ? ? g.__name__ = fun.__name__
> ? ? g.__dict__.update(fun.__dict__)
> ? ? g.__doc__ = fun.__doc__
> ? ? g.__module__ = fun.__module__
> ? ? return g
>
> @thisfunc
> def SOMEVERYUGLYNAME(this, n):
> ? ? return 1 if n <= 1 else n * this(n - 1)
>
> assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6
>
> Bye,
> bearophile

/Actually/, the 'g' variable was spurious.  FWIW.

def auto( f ):
    def _inner( *ar, **kw ):
        return f( _inner, *ar, **kw )
    return _inner



From robert.kern at gmail.com  Tue May  5 17:30:02 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 05 May 2009 17:30:02 -0400
Subject: Numpy on python 2.7a
In-Reply-To: <200905052006.17708.a.cavallo@cavallinux.eu>
References: <200905052006.17708.a.cavallo@cavallinux.eu>
Message-ID: <gtqb4q$us$1@ger.gmane.org>

On 2009-05-05 15:06, A. Cavallo wrote:
> Hi,
>
> I'm trying to compile numpy using my own pet project based on the python svn
> code (that's the reason for the 2.7a tag).

Ask on the numpy-discussion mailing list:

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From QJing.Li at gmail.com  Tue May  5 17:42:15 2009
From: QJing.Li at gmail.com (Leon)
Date: Tue, 5 May 2009 14:42:15 -0700 (PDT)
Subject: what's the best way to call a method of object without a 
	guarantee of its existence
References: <22690572-e338-483a-a99a-85ccf6c5fae6@x6g2000vbg.googlegroups.com>
	<9uULl.4199$Ux.2825@tornado.fastwebnet.it>
Message-ID: <0348bb8e-3c1a-410d-a886-352b9b0ae391@e23g2000vbe.googlegroups.com>


On May 5, 3:25?am, Marco Mariani <ma... at sferacarta.com> wrote:
> Leon wrote:
> > One way, ?define the object before it is used,
> > like this:
> > object = None
>
> This is a good practice anyway. Conditional existance of objects is
> quite evil. Resorting to if defined('foo') is double-plus-ugly.

This was why I asked this question. In my program, I use the pattern
of
object.method() a lot, but every time I need to check if it exists or
not,
which makes me feel uncomfortable.


> > The other way, using try ... catch
> > try:
> > ? ? ?object.method()
> > catch NameError:
> > ? ? ?pass
>
> Except you should trap AttributeError because you defined the thing as
> None before. NameErrors should be fixed as bugs, not trapped (IMHO --
> but in python there is always a use case for everything).
>
> Keep in mind that AttributeError might come from inside the method(),
> which could be confusing
>
> By using the
>
> if stuff:
> ? ? stuff.run()
>
> idiom, you avoid the last issue and keep it simple enough.
>
> > for ?big programs, which is better, or any other way?
>
> Define "big", as in scope, LOCs, or number of committers?
"big", I mean, is not in the same scope
For instance,


class frame(wx.Frame):
  def __init__(self, parent, ....):
      ....
      self.parent = parent # parent from another module
      .....

  def eventHandler_1(self,event):
      if self.parent.object_1 is not None:
         self.parent.object_1.method()

  def eventHandler_2(self, event):
      if self.parent.object_2 is not None:
         self.parent.object_2.method()

So I need to go back to the module including "parent" class
to define the objects that I maybe use in future as None,
actually, the module including "parent' class works very well
without those definitions, from parent class's point of view,
those definitions are kind of noisy.

Thanks Marco




From gunterhenriksen at gmail.com  Tue May  5 18:05:46 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Tue, 5 May 2009 15:05:46 -0700
Subject: How to walk up parent directories?
In-Reply-To: <87ocu9k6c4.fsf@benfinney.id.au>
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
	<87ocu9k6c4.fsf@benfinney.id.au>
Message-ID: <ab4fa3490905051505l76ce3a57yb79c2b26f1abfbba@mail.gmail.com>

Be careful not to presume "/a/b/" is the same directory as "/a/b/c/../"
I would consider the latter the parent of /a/b/c/, not the former.


From tjreedy at udel.edu  Tue May  5 18:14:19 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 05 May 2009 18:14:19 -0400
Subject: Google selects Mercurial for DVCS support
Message-ID: <gtqdnp$9cd$1@ger.gmane.org>

Given the debate over Python's choice of Mercurial, some might fine the 
following interesting.
http://google-code-updates.blogspot.com/2009/04/mercurial-support-for-project-hosting.html
Currently, Mercurial support will be in addition to continued Subversion 
support.

It was also reported on
http://arstechnica.com/open-source/news/2009/04/google-code-adds-mercurial-version-control-system.ars
with comments.



From georgeoliverGO at gmail.com  Tue May  5 18:15:37 2009
From: georgeoliverGO at gmail.com (George Oliver)
Date: Tue, 5 May 2009 15:15:37 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5117.1241549976.11746.python-list@python.org>
	<ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
	<0c2f0973-1829-46fa-a28c-c38e7906e750@l5g2000vbc.googlegroups.com>
Message-ID: <045e683e-5791-4af0-a400-b759064a8046@v23g2000pro.googlegroups.com>

Thanks for the suggestions so far. I've taken the advice to keep
things simple so currently I'm just creating one instance of the
commandHandler and assigning it a name with command = commandHandler
(). This makes it easy to call it from any of the other handlers, and
I think this will work for what I want the game to do.


From deets at nospam.web.de  Tue May  5 18:26:30 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 06 May 2009 00:26:30 +0200
Subject: Error in running python -v on Mac ox 10.5.
In-Reply-To: <b39ce186-56d3-4dae-84ce-24a7c92bb50a@k9g2000pra.googlegroups.com>
References: <b39ce186-56d3-4dae-84ce-24a7c92bb50a@k9g2000pra.googlegroups.com>
Message-ID: <76bsomF1bmc0oU1@mid.uni-berlin.de>

silverburgh schrieb:
> Hi,
> 
> I run 'python -v' on Macos 10.5 but I get this error :
> # can't create /System/Library/Frameworks/Python.framework/Versions/
> 2.5/lib/python2.5/encodings/utf_8.pyc
> 
> Can you please tell me how to fix it?

This looks like a rights-problem to me, and a missing pyc-file.

If you do

sudo python -v

does it work? Then, utf_8.pyc might have been created, and subsequent 
sudo-less inovcations might work.

Diez


From google at mrabarnett.plus.com  Tue May  5 18:33:34 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 05 May 2009 23:33:34 +0100
Subject: Self function
In-Reply-To: <6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>	<m2iqkhnzxy.fsf@googlemail.com>	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>	<mailman.5072.1241474108.11746.python-list@python.org>	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com>
Message-ID: <4A00BEBE.90608@mrabarnett.plus.com>

Steve Howell wrote:
> On May 4, 11:08 pm, Steven D'Aprano
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> I propose a small piece of sugar. When a function is entered, Python
>> creates an ordinary local name in the function's local namespace, and
>> binds the function itself to that name. Two possibilities for the name
>> are `this` or `__this__`, analogous to `self` in methods and `__name__`
>> in modules.
>>
>> If there is any support for this, I propose to send the following (long)
>> post to python-ideas. Feedback, corrections and suggestions welcome.
>>
> 
> I totally support this proposal.   I've definitely wasted time in the
> past trying to invent my own workarounds for the use cases you
> describe.
> 
> Obviously, there will be some bikeshed debates on __this__ vs.
> __name__ vs. __func__, etc.  I don't have an opinion there, just want
> *something* handy for introspection, DRYness, etc.
> 
> A more interesting question is whether __this__ would just always be
> there (that's my vote), or if you should have to apply a special
> decorator to get it (which I oppose, but I can see some merits).
> 
I'd say that __this__ is a little unclear, so I'd choose __func__.


From norseman at hughes.net  Tue May  5 19:28:41 2009
From: norseman at hughes.net (norseman)
Date: Tue, 05 May 2009 16:28:41 -0700
Subject: Any idea to emulate tail -f
In-Reply-To: <1241503205.5374.25.camel@keblar.lapjoe>
References: <1241503205.5374.25.camel@keblar.lapjoe>
Message-ID: <4A00CBA9.6030402@hughes.net>

Joel Juvenal Rivera Rivera wrote:
> I want to make something very similar to  the command tail -f (follow a
> file), i have been trying  with some while True and some microsleeps
> (about .1 s); did someone has already done something like this?
> 
> And about the file is the apache acceslog  of a site with a lot of
> traffic.
> 
> Regards    
> 
> joe / Joel Rivera
> 
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
==============================================
I read the 4 replies available at this point in time. I agree with them 
in the general sense.

Question 1:  Why not use tail -f | my_program.py ??
               (The obvious answer is that you are not in a Unix OS)

Question 2:  Have you looked at Popen2.popen3? (No, you are not in ..)
                In the Unix environment one can output to log files that
                are actually named pipes. Program 'up and running' leaves
                the keyboard (or in this case stdin) open.  Kinda like
                typing something into the letter, go to lunch, come back
                and type in some more.  Self regulating.  Might be able
                to dummy up something that emulates the concept.

Question 3:  How much CPU time do you need dedicated to this?
                Running a program again every 0.1seconds uses resources.
                CRON at x-minute intervals uses less. (bigger the x, less
                the resources.)

Question 4:  Is the program looking for things that, if found, need to
                sound the Claxton (nasty ear ponding alarm noise)?
              Or is it just to update the monitor over there on the side?
                (ie.. How time critical is it?) This effects Q3's answer.

Question 5:  Does the monitor machine just have to be NOT Linux?
              Does the log file just have to be NOT on a Linux machine?

If the Claxton is the point of your program, consider Q5 carefully.  If 
for some reason the log can not reside on a Linux/Unix drive, see if 
samba type linkage from a Linux to the logfile OS is doable. (It is if 
the IT types don't get in the way.)  From Linux you then mount the samba 
and use the soft link and run your program accordingly and it works as 
hinted in questions 1 and 2. Soft link is created by:
ln -s /path/real_file /different_path/same_or_different_f-name
2nd is treated as original and reacts same as if it were.


I would make one request.  Please tell people the OS you want the 
program on when you ask the question originally. To use yours:

"I want to make something very similar to the command tail -f ..." FOR 
USE IN MS WINDOWS XP.  or whatever.
XP and VISTA have frustrating differences and neither are UNIX or MAC.


I know I haven't given anything like the answers the others provided, 
but then I really am not sure of the intended use or OS.

Fire alarms are one thing, gleaning is another.  One is extremely time 
critical while for the other "tomorrow" is OK.


Steve


From rhodri at wildebst.demon.co.uk  Tue May  5 20:06:35 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 06 May 2009 01:06:35 +0100
Subject: call function of class instance with no assigned name?
In-Reply-To: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
Message-ID: <op.uthek9t1a8ncjz@gnudebst>

On Tue, 05 May 2009 16:52:39 +0100, George Oliver  
<georgeoliverGO at gmail.com> wrote:

> hi, I'm a Python beginner with a basic question. I'm writing a game
> where I have keyboard input handling defined in one class, and command
> execution defined in another class. The keyboard handler class
> contains a dictionary that maps a key to a command string (like 'h':
> 'left') and the command handler class contains functions that do the
> commands (like def do_right(self):),
>
> I create instances of these classes in a list attached to a third,
> 'brain' class. What I'd like to have happen is when the player presses
> a key, the command string is passed to the command handler, which runs
> the function. However I can't figure out a good way to make this
> happen.
>
> I've tried a dictionary mapping command strings to functions in the
> command handler class, but those dictionary values are evaluated just
> once when the class is instantiated. I can create a dictionary in a
> separate function in the command handler (like a do_command function)
> but creating what could be a big dictionary for each input seems kind
> of silly (unless I'm misunderstanding something there).

Taking a wild guess when you were creating that dictionary mapping
command strings to functions, did you map to function calls or to the
function objects themselves?  I'd make a small wager you did the former,
and the latter would have done what you want.  Something like this,
maybe?

>>>> CODE FOLLOWS<<<<

class DoSomething(object):
     def do_this(self):
         print "Doing this"

     def do_that(self):
         print "Doing that"

     def do_the_other(self):
         print "Doing the other"

     _CMD_DICT = { 'this' : do_this,
                   'that' : do_that,
                   'the other' : do_the_other }

     def update(self, cmd):
         try:
             DoSomething._CMD_DICT[cmd](self)
         except KeyError:
             print "Foul!  Foul, I say!"

>>>> END CODE<<<<

To be honest, the getattr approach is probably as easy to follow
and less prone to forgetting to update the dictionary.


-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From cournape at gmail.com  Tue May  5 20:37:21 2009
From: cournape at gmail.com (David Cournapeau)
Date: Wed, 6 May 2009 09:37:21 +0900
Subject: Numpy on python 2.7a
In-Reply-To: <200905052006.17708.a.cavallo@cavallinux.eu>
References: <200905052006.17708.a.cavallo@cavallinux.eu>
Message-ID: <5b8d13220905051737g222bdb62y2d7c6c132b9e82bc@mail.gmail.com>

On Wed, May 6, 2009 at 4:06 AM, A. Cavallo <a.cavallo at cavallinux.eu> wrote:
> Hi,
>
> I'm trying to compile numpy using my own pet project based on the python svn
> code (that's the reason for the 2.7a tag).

It is a python bug, see bugs 5940 and 5941.

cheers,

David


From silverburgh.meryl at gmail.com  Tue May  5 20:57:40 2009
From: silverburgh.meryl at gmail.com (silverburgh)
Date: Tue, 5 May 2009 17:57:40 -0700 (PDT)
Subject: Install Python 3.0 dmg to macos 10.5
Message-ID: <627526f7-ac27-4874-b234-13d1a13accf5@y33g2000prg.googlegroups.com>

Hi,

If I install python 3.0 dmg, will it wipe out the existing python
installation on macos 10.5 (i don't know how the original python was
installed ( i think it is version 2.5).

Thank you.


From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 20:58:03 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 06 May 2009 00:58:03 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com>
	<mailman.5100.1241526783.11746.python-list@python.org>
	<565698f7-d95b-4b99-95a5-5de68d983400@q2g2000vbr.googlegroups.com>
Message-ID: <pan.2009.05.06.00.58.02@REMOVE.THIS.cybersource.com.au>

On Tue, 05 May 2009 06:30:01 -0700, Arnaud Delobelle wrote:

> One issue with automatically binding a local variable to the current
> function is with nested functions:
> 
> def foo()
>     def bar():
>        # How do I call foo() from here?

As foo(), just like you would call foo() from outside of foo(). __this__ 
would refer to bar() inside bar().

My proposal isn't meant to solve the general case "how do I call any 
function anywhere without knowing its name?". I don't think there is a 
general solution to that problem (although obviously you can do it in 
special cases). My proposal is sugar for a fairly general problem "how 
should a function refer to itself?", not an alternative mechanism for 
referring to functions outside of the usual namespace lookup mechanism.



> One solution would be
> 
> def foo()
>     def bar(foo=__this__):
>         foo()


That would be an option, if the programmer had some reason for wanting to 
do this.
 


-- 
Steven


From rhodri at wildebst.demon.co.uk  Tue May  5 21:35:08 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 06 May 2009 02:35:08 +0100
Subject: Self function
In-Reply-To: <4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
Message-ID: <op.uthious2a8ncjz@gnudebst>

On Tue, 05 May 2009 21:43:16 +0100, <bearophileHUGS at lycos.com> wrote:

> wolfram.hinde...:
>> It is easy to change all references of the function name, except for
>> those in the function body itself? That needs some explantation.
>
> I can answer this. If I have a recursive function, I may want to
> create a similar function, so I copy and paste it, to later modify the
> copied version. Then to change its name I usually don't use a search &
> rename of its name into its block of code because it's usually
> useless. In non-recursive functions the name of the function is stated
> only once, at the top.

I'm sorry, but while I'm mildly positive towards the proposal (and more
so towards Aaron's decorator), I don't buy this argument at all.  What
is broken about your editor's global search-and-replace function that
makes it "usually useless" for making these name changes?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From revathi5587 at gmail.com  Tue May  5 21:36:56 2009
From: revathi5587 at gmail.com (revathy)
Date: Tue, 5 May 2009 18:36:56 -0700 (PDT)
Subject: work at online earn 50$ daily
Message-ID: <aa363403-fa56-4534-8355-89b6aad71050@x29g2000prf.googlegroups.com>

click the following link

==========================================

http://www.s1.webstarts.com/physicsengines/

===========================================


From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 21:52:24 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 06 May 2009 01:52:24 GMT
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>
	<49FB2225.4030601@councilforeconed.org> <49FB2AA7.6020403@snet.net>
	<mailman.5113.1241545418.11746.python-list@python.org>
Message-ID: <pan.2009.05.06.01.52.24@REMOVE.THIS.cybersource.com.au>

On Tue, 05 May 2009 13:43:32 -0400, J. Cliff Dyer wrote:

> On Fri, 2009-05-01 at 13:00 -0400, John Posner wrote:
>> Shane Geiger wrote:
>> >    if type(el) == list or type(el) is tuple:
>> A tiny improvement:
>> 
>>         if type(el) in (list, tuple):
>> 
>> 
> Another alternative, which might be useful in some cases:
> 
>           if hasattr(el, '__iter__'):
> 
> This covers all iterables, not just lists and tuples.

Except for the ones that it doesn't cover, like strings:

>>> hasattr('abcd', '__iter__')
False
>>> list(iter('abcd'))
['a', 'b', 'c', 'd']


And classes that follow the sequence protocol:


>>> class Spam:
...     def __getitem__(self, index):
...             if 0 <= index < 5:
...                     return "spam"
...             raise IndexError
...
>>> hasattr(Spam(), '__iter__')
False
>>> list(iter(Spam()))
['spam', 'spam', 'spam', 'spam', 'spam']




-- 
Steven


From gagsl-py2 at yahoo.com.ar  Tue May  5 22:24:32 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 05 May 2009 23:24:32 -0300
Subject: Problem with case insensitive volumes
References: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
	<mailman.5088.1241498014.11746.python-list@python.org>
	<26c57bf5-5ad2-4838-8097-c8d51cf1ccae@n8g2000vbb.googlegroups.com>
	<b4adnUex6-RR2J3XnZ2dnUVZ_t2dnZ2d@pdx.net>
	<b5d10d01-0f56-4df9-9e4e-99a93a0e0a0f@s31g2000vbp.googlegroups.com>
Message-ID: <op.utg15ulfx6zn5v@gabriel.sleipnir-bsas>

En Tue, 05 May 2009 12:55:13 -0300, spillz <damienlmoore at gmail.com>
escribi?:
>
> /my/path/to/usbkey/and/file
>
> everything up to "/my/path/to/usbkey" is case sensitive. only the "and/
> file" is case insensitive. but my list of stored paths might include
> all images under "/my". thus
>
> /my/path/to/usbkey/and/file1==/my/path/to/usbkey/and/FILE1
> /my/path/to/usbkey/and/file1==/my/path/to/usbkey/AND/FILE1
> but
> /my/path/to/usbkey/and/file1!=/my/path/TO/usbkey/AND/FILE1
>
> so to do this right I'd need to establish which parts of the path are
> case insensitive. being able to retrieve the actual path from an
> equivalent representation would be so much simpler.

I use this function on Windows to obtain the true case name of a file:

<code>
  from win32api import FindFiles
  from win32file import FILE_ATTRIBUTE_DIRECTORY
  from os.path import normpath, split, join

def truecase(fullpath, _cache={}):
      """
      Normalize fullpath, returning names using the
      same case as actually used in the filesystem.
      """
      fullpath = normpath(fullpath)
      dirname, filename = split(fullpath)
      dirname = dirname.lower()
      if not filename:
          # drive letter
          result = _cache[dirname] = dirname.upper()
          return result
      if dirname in _cache: dirname = _cache[dirname]
      elif dirname: dirname = truecase(dirname)
      finddata = FindFiles(fullpath)
      if not finddata:
          import errno, os
          raise IOError(errno.ENOENT, os.strerror(errno.ENOENT), fullpath)
      if len(finddata)!=1:
          raise ValueError("Too many results for %r" % fullpath)
      attr = finddata[0][0]
      filename = finddata[0][8]
      result = join(dirname, filename)
      if attr & FILE_ATTRIBUTE_DIRECTORY:
          _cache[result.lower()] = result
      return result
</code>

truecase("c:")=="C:"
truecase("C:\\")=="C:\\"
truecase("c:\\")=="C:\\"
truecase("C:\\TeMp")=="C:\\TEMP"
truecase("C:\\TeMp\\")=="C:\\TEMP\\"
truecase(r"C:\Documents and Settings\gabriel")==r"C:\Documents and
Settings\gabriel"
truecase(r"c:\dOcUmEnTs aNd SeTtInGs\GaBrIeL\mIS DOCUMENTOS\105_3 - nist -
sPECIFICATIONS vOLUMETRIC fIELD sTANDARD.PDF")==r"C:\Documents and
Settings\gabriel\Mis documentos\105_3 - NIST - Specifications Volumetric
Field Standard.pdf"
truecase(r"E:\prog\test\compface\Debug\No existe.txt")

-- 
Gabriel Genellina



From zac256 at gmail.com  Tue May  5 22:52:25 2009
From: zac256 at gmail.com (Zac Burns)
Date: Tue, 5 May 2009 19:52:25 -0700
Subject: Cannot start a thread in atexit callback
Message-ID: <333edbe80905051952v56ced17cl5aaa4b04bb8d3120@mail.gmail.com>

It seems that one cannot start a thread in an atexit callback.

My use case is that I have a IO heavy callback that I want to run in a
thread so that other callbacks can finish while it's doing it's thing
to save on exit time.

Example code (py3k)
############################################
import threading
import time
import atexit

def print_():
??? print(1)
??? time.sleep(1)
??? print(2)

def test():
??? threading.Thread(target=print_).start()


atexit.register(test)
############################################

--
Zachary Burns
(407)590-4814
Aim - Zac256FL
Production Engineer (Digital Overlord)
Zindagi Games


From davea at ieee.org  Tue May  5 22:55:53 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 05 May 2009 22:55:53 -0400
Subject: call function of class instance with no assigned name?
In-Reply-To: <ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>	<mailman.5117.1241549976.11746.python-list@python.org>
	<ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
Message-ID: <4A00FC39.4010107@ieee.org>

George Oliver wrote:
> On May 5, 11:59 am, Dave Angel <da... at ieee.org> wrote:
>
>   
>> 1) forget about getattr() unless you have hundreds of methods in your
>> map.  The real question is why you need two maps. What good is the
>> "command string" doing you?   Why not just map the keyvalues directly
>> into function objects?
>>     
>
>
> Thanks for the reply Dave. I understand your example and it's what I
> originally used. Here is more detail on what I'm doing now, I hope
> this will explain my question better.
>
> In the game I'm writing the player, monsters, items and so on are
> instances of class Thing, like:
>
> class Thing(object):
>     def __init__(self, x, y, name):
>         self.x, self.y = x, y
>         self.name = name
>         self.brain = None
>
> Some Things have an instance of class Brain attached. The Brain
> instance has a list of handlers, like:
>
> class Brain(object):
>     def __init__(self):
>         self.handlers = []
>
> A handler class defines some functionality for the Brain. Each Brain
> has an update method like this:
>
> def update(self, arguments):
>     for handler in self.handlers:
>         handler.update(arguments)
>
> So on each pass through the main game loop, it calls the update method
> of all the brains in the game, which run their handler update methods
> to change the state of the game.
>
> A handler would be something like a key input handler. The key input
> handler is defined separately from the command handler in the case I
> want to use a different method of input, for example a mouse or
> joystick.
>
> In the dictionary of key inputs I could map each input directly to a
> function. However there is no instance name I can call the function
> on, as I create a thing, add a brain, and add handlers to the brain
> like this:
>
> player = Thing(26, 16, 'player')
> player.brain = Brain()
> player.brain.add_handlers(
>                             commandHandler(player.brain, player),
>                             keyboardHandler(player.brain),
>                             fovHandler(player.brain))
>
>
> So what I'm wondering is how to reference the instance in each brain's
> list of handlers when I want to map something like a key input to a
> command, or what a better way might be to structure the code.
>
>
>   
 >>

>>player.brain.add_handlers(
>>                            commandHandler(player.brain, player),
>>                            keyboardHandler(player.brain),
>>                            fovHandler(player.brain))

You're executing commandHandler, and passing its return value into the 
add_handlers() method.  So commandHandler is a function, not a method, 
and what is its relationship to anything that actually processes commands?

Sorry, your pseudo-code is so far from real code that I can't figure out 
what you're doing.  So I guess I can't be any help till something else 
turns up to make it clearer.  Maybe it's just me.




From musicguy at alphaios.net  Tue May  5 23:14:06 2009
From: musicguy at alphaios.net (The Music Guy)
Date: Tue, 5 May 2009 22:14:06 -0500
Subject: FLV download script works, but I want to enhance it
Message-ID: <f61e9a8c0905052014h4ea04ev5d82158d3bf7e17a@mail.gmail.com>

I've written a script that can scan any number of web pages for urls
to .flv (Flash Video) files and then download them using urllib2. It's
kind of like a YouTube download utility, but more general-purpose (and
it doesn't actually work with YouTube. :P). The script works fine; it
even has support for outputting URLs of files it's found to stdout for
chaining to tools like wget.

After I download the files, I usually want to convert them to another
video format using command line tools, and I usually convert each one
in a separate terminal since that way they can all be converted at the
same time rather than one-by-one. Oddly enough, converting tends to
take longer than downloading, but converting multiple files at once is
faster than converting them one-by-one.

What I want to do is add an option to my script that will make it
begin converting each video using my command line tool after each is
downloaded, while at the same time continuing to download other files
in the background. I know this is possible using threading or
subprocesses, but I need help figuring out how to do it. Another thing
I want to do is allow the script to use wget for downloading instead
of urllib2.

The script is below. I've already added the options for the new
features, but they don't do anything yet.

#!/usr/bin/env python

import urllib
import re
import sys
import optparse

HELP = """ %prog [-p] url1, url2, url3, ...

    Flash Video Snagger (FLVSnag)

    Tool for downloading files referenced in the source code of some
    video-displaying websites. Simply pass a website URL as the first
    argument and the HTML will be scanned for URLs to .flv files and
    they will be downloaded.

    Note that all given pages are scanned before the first video is
    downloaded.

    FIXME: Downloads may not occur in the order that they are found.

                                              - The Music Guy, 5/5/09
                                                musicguy at alphaios.net
"""

def main():
    # Create the option parser and parse the options.
    parser = optparse.OptionParser(usage=HELP)
    parser.add_option(
        '-p', '--print',
         action = 'store_true',
         default = False,
         help =
            "Causes the URLs to be printed to stdout (one URL per line) "
            "without actually downloading them. Good for piping."
    )
    parser.add_option(
        '-d', '--dpg',
        action = 'store_true',
        default = False,
        help =
            "TODO: Converts each downloaded file to DPG if dpgconv.py
is available "
            "from the PATH."
    )
    parser.add_option(
        '-w', '--wget',
        action = 'store_true',
        default = False,
        help =
            "TODO: Downloads each file using wget instead of using internal "
            "downloader. Only works if wget is available from the PATH."
    )
    ops,args = parser.parse_args()
    if not args:
        parser.print_usage()
        return

    # Create a pattern that matches embedded .flv file URLs.
    urlre = re.compile("http\:\/\/(?<!\?)[a-zA-Z0-9_ \.\/]*\.flv", re.I)

    # Download the given URLs and scan the files for video URLs.
    m = set()
    for u in args:
        # Try to download the pages.
        try:
            f = urllib.urlopen(u)
        except IOError:
            sys.exit('ERROR: Unable to open url "%s".'%u)
        s = f.read()
        f.close()

        # Add any located URLs to the set.
        m = m.union(urlre.findall(s))

        # Delete page to save space.
        del s

    # If the user did not specify to print video URLs, download the videos.
    if not ops.p:
        # Print a notice if no URLs are found.
        if not m:
            print "No URLs found."
            return

        # Create a pattern to match video filename
        fnre = re.compile("[a-zA-Z0-9_ \.]*\.flv", re.I)

        # Download each video
        for v in m:
            p = fnre.findall(v)[0]
            print 'Downloading "%s" to "%s"...'%(v,p)
            urllib.urlretrieve(v,p)
            print 'done.'

    # If the user said to print video URLs, just print, don't download.
    else:
        for v in m:
            print v


if __name__ == '__main__':
    main()


From gallium.arsenide at gmail.com  Tue May  5 23:16:41 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Tue, 5 May 2009 20:16:41 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>
Message-ID: <3d167fe3-da37-4d1e-a43a-832819a0e405@h23g2000vbc.googlegroups.com>

On May 5, 10:49?am, Ross <ross.j... at gmail.com> wrote:
> I'm interested to see what you did. From your description,
> it sounds like I've tried what you've done, but when I
> implemented my version, it took minutes to evaluate for
> bigger numbers. If that isn't the case with yours, I'd be
> interested in seeing your implementation.

I don't know how big your "bigger numbers" are, but this should run in
a reasonable time.  It helps if you are using Python 2.6.  If not, you
should go on-line to the itertools docs to get the pure-Python
equivalent for itertools.combinations.

Since no matches are "thrown away", the byes are expressed simply as a
list of players that have to sit out for the week.

A couple of the lines are on the longish side, so beware of wrapping
from the browser/newsreader.

# Let's just try choosing from the possible combinations, each week
# scheduling those who have played the least or waited the longest.

import itertools

class Player(object):
    def __init__(self, id):
        self.id = id
        self.played = []
        self.latency = 0

    def __str__(self):
        str(self.id)

    def __cmp__(self, other):
        if len(self.played) != len(other.played):
            return len(self.played) - len(other.played)
        return other.latency - self.latency # select longer latency
first

def flattened(listOfLists):
    return list(itertools.chain(*listOfLists))

def pairings(players):
    idlist = range(players)
    playerlist = [Player(i) for i in idlist]
    matchlist = list(itertools.combinations(idlist, 2))
    while matchlist:
        found = False
        playerlist.sort()
        for i in range(players - 1):
            for j in range(i + 1, players):
                candidate = tuple(sorted((playerlist[i].id, playerlist
[j].id)))
                if candidate in matchlist:
                    yield matchlist.pop(matchlist.index(candidate))
                    for p in playerlist:
                        if p.id == candidate[0]:
                            p.played.append(candidate[1])
                            p.latency = 0
                        elif p.id == candidate[1]:
                            p.played.append(candidate[0])
                            p.latency = 0
                        else:
                            p.latency += 1
                    found = True
                    break
            if found: break

def schedule(players, weeks, courts):
    playerlist = range(players)
    matchlist = list(pairings(players))
    cap = min(courts, players // 2)
    start = 0
    for week in range(weeks):
        matches = matchlist[start:start + cap]
        byes = set(playerlist) - set(flattened(matches))
        print matches, list(byes)
        start += cap


From namekuseijin at gmail.com  Tue May  5 23:17:28 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Wed, 6 May 2009 00:17:28 -0300
Subject: yet another list comprehension question
In-Reply-To: <4A005757.7050405@gmail.com>
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
	<gtm1ik$19tj$1@adenine.netfront.net>
	<mailman.5039.1241439352.11746.python-list@python.org>
	<f0b70e0d-31c2-4d95-bec4-0e57e5d3a860@o14g2000vbo.googlegroups.com>
	<4A005757.7050405@gmail.com>
Message-ID: <67d0527e0905052017v7ede4c6akd87e41d77bd8ebcd@mail.gmail.com>

2009/5/5 Ricardo Ar?oz <ricaraoz at gmail.com>:
> This seems to work for any length tuples :
>
>>>> a = [(1,2), (3,4, 'goes'), (5,None), (6,7, 8, 'as', None), (8, None),
>>>> (9, 0)]
>>>> [tup for tup in a if not [e for e in tup if e == None]]
> [(1, 2), (3, 4, 'goes'), (9, 0)]

Why that extra "for"?  KISS

>>> a = [(1,2), (3,4, 'goes'), (5,None), (6,7, 8, 'as', None), (8, None), (9, 0)]
[(1, 2), (3, 4, 'goes'), (5, None), (6, 7, 8, 'as', None), (8, None), (9, 0)]
>>> [t for t in a if None not in t]
[(1, 2), (3, 4, 'goes'), (9, 0)]

"in" works perfectly well for any sequence, including strings.


From wuwei23 at gmail.com  Tue May  5 23:36:37 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 5 May 2009 20:36:37 -0700 (PDT)
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com> 
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com> 
	<mailman.5115.1241546468.11746.python-list@python.org>
Message-ID: <a7974919-a216-42a8-bcb8-a57310501e85@z16g2000prd.googlegroups.com>

On May 6, 4:01?am, "J. Cliff Dyer" <j... at sdf.lonestar.org> wrote:
> The way you have to bounce your eyes back and forth in the comprehension
> makes it hard to read the logic. ?With the loop, on the other hand it is
> blatantly obvious which way the nesting occurs.

> > >>>> [ item for j in a if len(j)==2 for item in j if item % 2 ]
> > > ...opposed to...
> > >>>> for j in a:
> > > ... ? ? if len(j)==2:
> > > ... ? ? ? ? for item in j:
> > > ... ? ? ? ? ? ? if item % 2:
> > > ... ? ? ? ? ? ? ? ? b.append(item)
> > > ...

> Much nicer. ?Thank you.

Apart from the presence of 'item' at the beginning of the list
comprehension as opposed to 'b.append(item)' at the end of the for-
loop, how exactly does the listcomp force you to "bounce [..] back and
forth" to follow the logic? The only other difference between the two
is in the layout - the indentation & colons - otherwise they're
structurally identical.


From ross.jett at gmail.com  Tue May  5 23:37:37 2009
From: ross.jett at gmail.com (Ross)
Date: Tue, 5 May 2009 20:37:37 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
Message-ID: <cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>

On May 5, 10:33?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> Ross wrote:
> > On May 5, 12:32 am, John Yeung <gallium.arsen... at gmail.com> wrote:
> >> On May 5, 1:12 am, John Yeung <gallium.arsen... at gmail.com> wrote:
>
> >>> [...] the problem may require bigger guns (either much better
> >>> math or much more sophisticated programming).
> >> Yes, I'm responding to myself.
>
> >> Well, I went ahead with the approach I mentioned earlier, generating
> >> all possible matches and then selecting among them as needed to fill
> >> up the courts, trying to keep the number of matches played by each
> >> player as fair as possible. ?(I should mention that this, or something
> >> similar, was suggested earlier by someone else in a different thread,
> >> in response to the same question by the same OP.)
>
> >> I did use "bigger guns" (mainly a class for player objects, with
> >> custom __cmp__ method), but still didn't do anything with doubles.
>
> >> I haven't tested it much, but I'll post it if anyone's interested.
> >> (That way people can pick on me instead of the OP. ;)
>
> >> John
>
> > I'm interested to see what you did. From your description, it sounds
> > like I've tried what you've done, but when I implemented my version,
> > it took minutes to evaluate for bigger numbers. If that isn't the case
> > with yours, I'd be interested in seeing your implementation.
>
> Here's my approach (incomplete):
>
> def get_pair(player_list, played):
> ? ? ?for first in range(len(player_list)):
> ? ? ? ? ?player_1 = player_list[first]
> ? ? ? ? ?for second in range(first + 1, len(player_list)):
> ? ? ? ? ? ? ?player_2 = player_list[second]
> ? ? ? ? ? ? ?pair = player_1, player_2
> ? ? ? ? ? ? ?sorted_pair = tuple(sorted(pair))
> ? ? ? ? ? ? ?if sorted_pair not in played:
> ? ? ? ? ? ? ? ? ?played.add(sorted_pair)
> ? ? ? ? ? ? ? ? ?del player_list[second]
> ? ? ? ? ? ? ? ? ?del player_list[first]
> ? ? ? ? ? ? ? ? ?return pair
> ? ? ?return None
>
> def round_robin(player_list, courts, played):
> ? ? ?playing = []
> ? ? ?for c in range(courts):
> ? ? ? ? ?pair = get_pair(player_list, played)
> ? ? ? ? ?if pair is None:
> ? ? ? ? ? ? ?break
> ? ? ? ? ?playing.append(pair)
> ? ? ?byes = player_list[:]
> ? ? ?player_list[:] = byes + [player for pair in playing for player in pair]
> ? ? ?yield playing, byes
>
> def test_round_robin(players, rounds, courts, doubles=False):
> ? ? ?player_list = range(players)
> ? ? ?played = set()
> ? ? ?for r in range(rounds):
> ? ? ? ? ?for playing, byes in round_robin(player_list, courts, played):
> ? ? ? ? ? ? ?print playing, byes

FYI... I was testing your code further and discovered a strange
outcome... when there are 16 people for 7 courts, every 7th round your
code produces 4 byes instead of the correct 2 byes.


From lrhazi at gmail.com  Tue May  5 23:43:25 2009
From: lrhazi at gmail.com (Mohamed Lrhazi)
Date: Tue, 5 May 2009 23:43:25 -0400
Subject: pyc files problem
Message-ID: <c4ab18df0905052043s5a2d4cbena7888fa4fcea366@mail.gmail.com>

Hello,

My code sends a pointer to a Python function to a C library, using
ctypes module. When my program restarts, after a crash or normal
exit... it cannot start again without sigfaulting

What is the proper way around this problem? other than adding code to
delete the cache files?

Thanks a lot,
Mohamed.


From campanha1 at dnsreverso.com  Tue May  5 23:46:12 2009
From: campanha1 at dnsreverso.com (Cursos)
Date: Wed, 6 May 2009 03:46:12 GMT
Subject: Curso de Excel
Message-ID: <20090506034824.5D8B91FF21C5@out19.dnsreverso.com>

An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20090506/801f15e3/attachment.html>

From gagsl-py2 at yahoo.com.ar  Tue May  5 23:59:59 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 06 May 2009 00:59:59 -0300
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
Message-ID: <op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 05 May 2009 22:35:08 -0300, Rhodri James  
<rhodri at wildebst.demon.co.uk> escribi?:
> On Tue, 05 May 2009 21:43:16 +0100, <bearophileHUGS at lycos.com> wrote:
>> wolfram.hinde...:

>>> It is easy to change all references of the function name, except for
>>> those in the function body itself? That needs some explantation.
>>
>> I can answer this. If I have a recursive function, I may want to
>> create a similar function, so I copy and paste it, to later modify the
>> copied version. Then to change its name I usually don't use a search &
>> rename of its name into its block of code because it's usually
>> useless. In non-recursive functions the name of the function is stated
>> only once, at the top.
>
> I'm sorry, but while I'm mildly positive towards the proposal (and more
> so towards Aaron's decorator), I don't buy this argument at all.  What
> is broken about your editor's global search-and-replace function that
> makes it "usually useless" for making these name changes?

It happened to me sometimes. If a module defines some functions, and it  
doesn't *use* them, why should I use a global search-and-replace to rename  
something? Modifying the "def" line should be enough - unless the function  
happens to be recursive.

It's the DRY principle in action, the same argument as when decorators  
where introduced: there should be no need to repeat the function name  
again and again.

-- 
Gabriel Genellina



From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 00:10:32 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 06 May 2009 04:10:32 GMT
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5115.1241546468.11746.python-list@python.org>
	<a7974919-a216-42a8-bcb8-a57310501e85@z16g2000prd.googlegroups.com>
Message-ID: <pan.2009.05.06.04.10.31@REMOVE.THIS.cybersource.com.au>

On Tue, 05 May 2009 20:36:37 -0700, alex23 wrote:

> On May 6, 4:01?am, "J. Cliff Dyer" <j... at sdf.lonestar.org> wrote:
>> The way you have to bounce your eyes back and forth in the
>> comprehension makes it hard to read the logic. ?With the loop, on the
>> other hand it is blatantly obvious which way the nesting occurs.
> 
>> > >>>> [ item for j in a if len(j)==2 for item in j if item % 2 ]
>> > > ...opposed to...
>> > >>>> for j in a:
>> > > ... ? ? if len(j)==2:
>> > > ... ? ? ? ? for item in j:
>> > > ... ? ? ? ? ? ? if item % 2:
>> > > ... ? ? ? ? ? ? ? ? b.append(item) ...
> 
>> Much nicer. ?Thank you.
> 
> Apart from the presence of 'item' at the beginning of the list
> comprehension as opposed to 'b.append(item)' at the end of the for-
> loop, how exactly does the listcomp force you to "bounce [..] back and
> forth" to follow the logic? The only other difference between the two is
> in the layout - the indentation & colons - otherwise they're
> structurally identical.


It's precisely the indentation and colons (plus newlines) that makes 
nested for-loops easier to read than list-comps with multiple fors.

for a in alist:
    for b in blist:
        for c in clist:
            if c:
                parrot(a, b, c)


is much easier to read than the equivalent one-liner:

[parrot(a, b, c) for a in alist for b in blist for c in clist if c]

You can get back *nearly* all the readability by splitting the list comp 
into multiple lines:

[parrot(a, b, c) 
    for a in alist 
      for b in blist
        for c in clist if c
]



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 00:18:03 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 06 May 2009 04:18:03 GMT
Subject: pyc files problem
References: <mailman.5136.1241581408.11746.python-list@python.org>
Message-ID: <pan.2009.05.06.04.18.02@REMOVE.THIS.cybersource.com.au>

On Tue, 05 May 2009 23:43:25 -0400, Mohamed Lrhazi wrote:

> Hello,
> 
> My code sends a pointer to a Python function to a C library, using
> ctypes module. When my program restarts, after a crash or normal exit...
> it cannot start again without sigfaulting
> 
> What is the proper way around this problem? other than adding code to
> delete the cache files?


Surely the proper way to solve this is to find the cause of the segfault, 
and fix that bug.



-- 
Steven


From gallium.arsenide at gmail.com  Wed May  6 00:36:12 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Tue, 5 May 2009 21:36:12 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
Message-ID: <e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com>

On May 5, 11:37?pm, Ross <ross.j... at gmail.com> wrote:

> On May 5, 10:33?am, MRAB <goo... at mrabarnett.plus.com> wrote:
>
> > Here's my approach (incomplete):
>
> FYI... I was testing your code further and discovered a strange
> outcome... when there are 16 people for 7 courts, every 7th
> round your code produces 4 byes instead of the correct 2 byes.

Well, MRAB did say his was incomplete, and it's significantly shorter
and cleaner than mine.

Mine has even weirder-looking behavior at 16 players on 7 courts, but
I think it's because mine tries harder to keep things balanced.  After
a few rounds, the inequalities start to build up, and my routine picks
some people more often to "catch up", but it doesn't prevent the same
person from being scheduled for multiple matches the same week.  There
may also be other, more subtle ways mine is broken.

It also may be that the problem is inherently unsolvable for some
values.  (I'm still waiting for someone with sufficient math ability
to swoop in and either provide a way that works for all values, or
confirm that there are just some unavoidable pathological cases.)

John


From tjreedy at udel.edu  Wed May  6 00:42:34 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 06 May 2009 00:42:34 -0400
Subject: list comprehension question
In-Reply-To: <pan.2009.05.06.01.52.24@REMOVE.THIS.cybersource.com.au>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>	<49FB2225.4030601@councilforeconed.org>
	<49FB2AA7.6020403@snet.net>	<mailman.5113.1241545418.11746.python-list@python.org>
	<pan.2009.05.06.01.52.24@REMOVE.THIS.cybersource.com.au>
Message-ID: <gtr4fr$l9i$3@ger.gmane.org>

Steven D'Aprano wrote:
> On Tue, 05 May 2009 13:43:32 -0400, J. Cliff Dyer wrote:

> Except for the ones that it doesn't cover, like strings:
> 
>>>> hasattr('abcd', '__iter__')
> False

True in Python3



From gagsl-py2 at yahoo.com.ar  Wed May  6 00:58:08 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 06 May 2009 01:58:08 -0300
Subject: pyc files problem
References: <c4ab18df0905052043s5a2d4cbena7888fa4fcea366@mail.gmail.com>
Message-ID: <op.uthr26pwx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 06 May 2009 00:43:25 -0300, Mohamed Lrhazi <lrhazi at gmail.com>  
escribi?:

> My code sends a pointer to a Python function to a C library, using
> ctypes module. When my program restarts, after a crash or normal
> exit... it cannot start again without sigfaulting

Do you mean that, if you delete the .pyc files your program runs properly,  
but if you keep the .pyc files your program crashes?
That's very strange...

> What is the proper way around this problem? other than adding code to
> delete the cache files?

There is no "proper way around" the problem; it should not exist in the  
first place!

Have you read the note at the end of the "Callback" section in the ctypes  
documentation?
"""Important note for callback functions:

Make sure you keep references to CFUNCTYPE objects as long as they are  
used from C code. ctypes doesn't, and if you don't, they may be garbage  
collected, crashing your program when a callback is made."""

There is a ctypes-specific list:  
https://lists.sourceforge.net/lists/listinfo/ctypes-users

-- 
Gabriel Genellina



From ganesh.gbg at gmail.com  Wed May  6 01:17:35 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Tue, 5 May 2009 22:17:35 -0700 (PDT)
Subject: problem in using sendmail in multi thread
References: <343747e9-549f-4336-9b15-522411a785a3@x1g2000prh.googlegroups.com>
	<m2zldrms9p.fsf@cs.uu.nl>
Message-ID: <f2453be6-12f3-4afd-be46-df6a3017fd0d@j18g2000prm.googlegroups.com>

On May 5, 9:25?pm, Piet van Oostrum <p... at cs.uu.nl> wrote:
> >>>>> gganesh <ganesh.... at gmail.com> (g) wrote:
> >g> hi,
> >g> I'm a beginner in using Python script
> >g> I'm trying to send mails using multi-thread
> >g> I wrote
> >g> FROM = 'ganeshx... at xxxx.com'
> >g> # for more mail add';' the another mail id
> >g> listTo = ['g.... at gmail.com', 'xxjango... at gmail.com',
> >g> 'xx... at yahoo.co.in']
> >g> SUBJECT = 'This is the subject'
> >g> MSGBODY = 'This the body of the message '
> >g> MAILSERVER = 'mail.xxxx.com'
> >g> port = 25
> >g> username = 'xxxxx'
> >g> password = 'xxxxx'
> >g> # trim the strings of any leading or trailing spaces
> >g> FROM = FROM.strip()
> >g> SUBJECT = SUBJECT.strip()
> >g> MSGBODY = MSGBODY.strip()
> >g> MAILSERVER = MAILSERVER.strip()
> >g> username = username.strip()
> >g> password = password.strip()
> >g> #Connect to server
> >g> print 'Connecting to mail server ', MAILSERVER
> >g> try:
> >g> ? ? ? s = smtplib.SMTP(MAILSERVER,port)
>
> You can't have a single SMTP connection that's used in multiple threads.
> That is what causes the error. Each thread should have its own SMTP
> connection. So move this code (above and below) into the run() method.
>
> >g> ? ? ? print 'connected'
> >g> #s.set_debuglevel(1)
> >g> except:
> >g> ? ? ? ?print 'ERROR: Unable to connect to mail server', sys.exc_info ?()[0]
> >g> ? ? ? ?sys.exit(1)
> >g> #login to server
> >g> if password <> '':
> >g> ? ? ? print 'Logging into mail server'
>
> I think this try except block should be inside the if statement, i.e.
> indented 4 spaces.
>
> >g> try:
> >g> ? ? ? s.login(username,password)
> >g> except:
> >g> ? ? ? print 'ERROR: Unable to login to mail server', MAILSERVER
> >g> ? ? ? print 'Please recheck your password'
> >g> ? ? ? sys.exit(1)
> >g> #--------------------------------------------------
> >g> print "Starting Multi Thread Method"
> >g> class MyThread(Thread):
> >g> ? ? def __init__(self, site, s, FROM, MSGBODY):
> >g> ? ? ? ? Thread.__init__(self)
> >g> ? ? ? ? self.site = site
> >g> ? ? ? self.s=s
> >g> ? ? ? self.FROM=FROM
> >g> ? ? ? self.MSGBODY=MSGBODY
>
> You give the s (connection) here as a parameter, store it in self.s and
> never use that attribute.
>
> >g> ? ? def run(self):
> >g> ? ? ? print "running for %s " %self.site
> >g> ? ? ? s.sendmail(self.FROM, self.site, self.MSGBODY)
>
> Here you use the global s, not self.s
>
> As I said above you should do the SMTP connection setup, including the
> login, here, and store the connection either in self.s or in a local
> variable s in the method. As you don't use the s in another method, I
> think a local variable is better.
>
> >g> ? ? ? print "Emailed for ?site %s" %self.site
> >g> a= time.time()
> >g> threads = []
> >g> for site in listTo:
> >g> ? ? T = MyThread(site,s,FROM,MSGBODY)
> >g> ? ? threads.append(T)
> >g> ? ? T.start()
> >g> for i in threads:
> >g> ? ? i.join()
>
> Of course the next 2 lines should also be moved to run().
>
> >g> s.quit()
> >g> s.close()
> >g> print "Took %s seconds" %str(time.time()-a)
> >g> #-----------------------------------------------------
>
> --
> Piet van Oostrum <p... at cs.uu.nl>
> URL:http://pietvanoostrum.com[PGP 8DAE142BE17999C4]
> Private email: p... at vanoostrum.org


Thanks Everyone By your guidance the code worked fine
I can send mails in multi threaded environment.
Is this only way to send mails concurrently  or any other method
aviable?
regards
Ganesh









From gagsl-py2 at yahoo.com.ar  Wed May  6 01:18:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 06 May 2009 02:18:41 -0300
Subject: Cannot start a thread in atexit callback
References: <333edbe80905051952v56ced17cl5aaa4b04bb8d3120@mail.gmail.com>
Message-ID: <op.uths1ff7x6zn5v@lepton.softlabbsas.com.ar>

En Tue, 05 May 2009 23:52:25 -0300, Zac Burns <zac256 at gmail.com> escribi?:

> It seems that one cannot start a thread in an atexit callback.
>
> My use case is that I have a IO heavy callback that I want to run in a
> thread so that other callbacks can finish while it's doing it's thing
> to save on exit time.

Try creating the thread when the program begins, but locked. And release  
the lock when your programs is about to finish.

-- 
Gabriel Genellina



From research at johnohagan.com  Wed May  6 01:56:35 2009
From: research at johnohagan.com (John O'Hagan)
Date: Wed, 6 May 2009 05:56:35 +0000
Subject: object query assigned variable name?
Message-ID: <200905060556.35190.research@johnohagan.com>

On Tue, 5 May 2009, Sion Arrowsmith wrote:
> John O'Hagan  <research at johnohagan.com> wrote:
> >I can see that it's tantalizing, though, because _somebody_ must know
> > about the assignment; after all, we just executed it!
>
> Except we haven't, if we're talking about reporting from the
>
> object's __init__:
> >>> class Brian:
>
> ...     def __init__(self):
> ...         print "I'm Brian!"
> ...
>
> >>> l = []
> >>> l[1] = Brian()
>
> I'm Brian!
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> IndexError: list assignment index out of range
>
> (Yeah, I know that's a setitem call not an assignment. Point stands.
> It also demonstrates why the whole idea of "what name is a newly-
> created object assigned to" is broken.)

I guess what I meant was that if I type:

brian = Brian()

in the python shell and then hit return, it seems to me that _somewhere_ (in 
the interpreter? I have no idea how it's done) it must be written that the 
new Brian object will later be assigned the name "brian", even as the process 
of creating the instance begins. As you've just demonstrated, the actual 
assignment occurs afterwards.

But even if this is true I'm guessing it'd be black magic to get to it.

Regards,

John


From gallium.arsenide at gmail.com  Wed May  6 02:10:34 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Tue, 5 May 2009 23:10:34 -0700 (PDT)
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com> 
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com> 
	<mailman.5115.1241546468.11746.python-list@python.org>
	<a7974919-a216-42a8-bcb8-a57310501e85@z16g2000prd.googlegroups.com>
Message-ID: <9086e914-3875-491c-8c88-ae697157b40f@o27g2000vbd.googlegroups.com>

On May 5, 11:36?pm, alex23 <wuwe... at gmail.com> wrote:

> Apart from the presence of 'item' at the beginning of the
> list comprehension as opposed to 'b.append(item)' at the
> end of the for-loop, how exactly does the listcomp force
> you to "bounce [..] back and forth" to follow the logic?

It's precisely the fact that the item is at the beginning which is the
main instigator of the bounce.  To tranlate

  [f(x) for x in a]

into a loop, you start in the middle, work your way toward the right,
then bounce back to the left.

I think some of us, perhaps subconsciously, get used to reading that
small chunk on the right, then bouncing left.  See enough small, flat
LCs, and we may be conditioned to think that the general rule is to
start with that small chunk on the right and bounce left.

When confronted with a long, nested LC then, some of us have the
instinct to read the rightmost chunk, then bounce left to the next-
rightmost chunk, etc.

Essentially, if you see [B A] over and over and over again, when
finally confronted with LCs of more "elements", it's not immediately
clear that the pattern of increasing nestedness is

  [B A] => [C A B] => [D A B C] => etc.

rather than

  [B A] => [C B A] => [D C B A] => etc.

Maybe we're wired wrong, but there are many of us who find the second
pattern more logical, which is why it is so easy for us to mess up the
order of the nesting in a more complex LC.

John


From wuwei23 at gmail.com  Wed May  6 03:20:29 2009
From: wuwei23 at gmail.com (alex23)
Date: Wed, 6 May 2009 00:20:29 -0700 (PDT)
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com> 
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com> 
	<mailman.5115.1241546468.11746.python-list@python.org>
	<a7974919-a216-42a8-bcb8-a57310501e85@z16g2000prd.googlegroups.com>
	<pan.2009.05.06.04.10.31@REMOVE.THIS.cybersource.com.au>
Message-ID: <75f5e3c1-1c0b-4278-bf43-172676e7903b@s1g2000prd.googlegroups.com>

On May 6, 2:10?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> It's precisely the indentation and colons (plus newlines) that makes
> nested for-loops easier to read than list-comps with multiple fors.
>
> You can get back *nearly* all the readability by splitting the list comp
> into multiple lines:

It was less the overall readability I was commenting on, and more the
claim that the listcomp required a 'back-and-forth' parsing to
understand. As you've reinforced, the listcomp can be readily
converted back to the multiple-line form by the inclusion of colons &
EOL markers, which means you can make as much sequential sense from a
listcomp as you can a for-loop.


From arnodel at googlemail.com  Wed May  6 03:23:42 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Wed, 6 May 2009 00:23:42 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com> 
	<4a69c949-ace7-47d9-8bb7-d05bc6c895f3@s31g2000vbp.googlegroups.com> 
	<50222a39-88d0-49da-9105-2d3a47af5940@r34g2000vba.googlegroups.com> 
	<5b81cccc-c174-42bd-b4a0-638755ca9e03@l5g2000vbc.googlegroups.com>
Message-ID: <57b22b7c-1130-4f28-a7b7-bd119445de41@z19g2000vbz.googlegroups.com>

On May 5, 10:20?pm, Aaron Brady <castiro... at gmail.com> wrote:
> def auto( f ):
> ? ? def _inner( *ar, **kw ):
> ? ? ? ? return f( _inner, *ar, **kw )
> ? ? return _inner

Quoting myself near the start of this thread:

Here's an idea:
>>> def bindfunc(f):

...     def boundf(*args, **kwargs):
...         return f(boundf, *args, **kwargs)
...     return boundf


--
Arnaud


From Graham.Dumpleton at gmail.com  Wed May  6 03:26:07 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Wed, 6 May 2009 00:26:07 -0700 (PDT)
Subject: Cannot start a thread in atexit callback
References: <333edbe80905051952v56ced17cl5aaa4b04bb8d3120@mail.gmail.com> 
	<mailman.5141.1241587143.11746.python-list@python.org>
Message-ID: <2acc47dd-35c0-40fa-8d56-bc1a52c87cc6@s1g2000prd.googlegroups.com>

On May 6, 3:18?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Tue, 05 May 2009 23:52:25 -0300, Zac Burns <zac... at gmail.com> escribi?:
>
> > It seems that one cannot start a thread in an atexit callback.
>
> > My use case is that I have a IO heavy callback that I want to run in a
> > thread so that other callbacks can finish while it's doing it's thing
> > to save on exit time.
>
> Try creating the thread when the program begins, but locked. And release ?
> the lock when your programs is about to finish.

FWIW, from Python 2.5 (??) onwards, a shutdown of non daemonized
threads is performed as a separate step before atexit callbacks. Not
sure if other aspects of threading may be undone at that point and so
prevent startup of new ones.

The code in threading module which is called is:

class _MainThread(Thread):

    ...

    def _exitfunc(self):
        self._Thread__stop()
        t = _pickSomeNonDaemonThread()
        if t:
            if __debug__:
                self._note("%s: waiting for other threads", self)
        while t:
            t.join()
            t = _pickSomeNonDaemonThread()
        if __debug__:
            self._note("%s: exiting", self)
        self._Thread__delete()

_shutdown = _MainThread()._exitfunc

The call to this is done from WaitForThreadShutdown() in main.c. Which
is in turn called from Py_Main() just prior to calling Py_Finalize().

        WaitForThreadShutdown();

        Py_Finalize();

This is all different to older versions of Python which shutdown such
threads from an actual atexit handler. This caused various ordering
issues.

Anyway, the point of this is that it would need to be a daemonized
thread to begin with. :-)

Graham


From google at mrabarnett.plus.com  Wed May  6 03:29:41 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 06 May 2009 08:29:41 +0100
Subject: Code works fine except...
In-Reply-To: <e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com>
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>	<mailman.5023.1241407766.11746.python-list@python.org>	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com>
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com>
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com>
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com>
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com>
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com>
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com>
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>
	<mailman.5111.1241544824.11746.python-list@python.org>	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com>
Message-ID: <4A013C65.4020104@mrabarnett.plus.com>

John Yeung wrote:
> On May 5, 11:37 pm, Ross <ross.j... at gmail.com> wrote:
> 
>> On May 5, 10:33 am, MRAB <goo... at mrabarnett.plus.com> wrote:
>>
>>> Here's my approach (incomplete):
>> FYI... I was testing your code further and discovered a strange
>> outcome... when there are 16 people for 7 courts, every 7th
>> round your code produces 4 byes instead of the correct 2 byes.
> 
> Well, MRAB did say his was incomplete, and it's significantly shorter
> and cleaner than mine.
> 
> Mine has even weirder-looking behavior at 16 players on 7 courts, but
> I think it's because mine tries harder to keep things balanced.  After
> a few rounds, the inequalities start to build up, and my routine picks
> some people more often to "catch up", but it doesn't prevent the same
> person from being scheduled for multiple matches the same week.  There
> may also be other, more subtle ways mine is broken.
> 
> It also may be that the problem is inherently unsolvable for some
> values.  (I'm still waiting for someone with sufficient math ability
> to swoop in and either provide a way that works for all values, or
> confirm that there are just some unavoidable pathological cases.)
> 
I'm not sure that all the requirements can be met.

I have the feeling that if the number of rounds is restricted then the
difference between the minimum and maximum number of byes could be 2
because of the requirement that players shouldn't play each other more
than once, meaning that the players have to be shuffled around a bit, so
a player might play a week earlier or later than would otherwise be the
case.

If every possible combination is done (everyone plays everyone else)
then the number of byes would be the same for all, otherwise the
difference could be 2, not 1. I think! :-)


From CKurtM at gmail.com  Wed May  6 04:38:16 2009
From: CKurtM at gmail.com (CkurtM)
Date: Wed, 6 May 2009 01:38:16 -0700 (PDT)
Subject: Pybuez Client sending messages to j2me Server
Message-ID: <5858a389-7b9f-4f29-848a-1ef80861c8ad@m24g2000vbp.googlegroups.com>

I have a problem with recieving requests on j2me based bluetooth
server using RFCOMM. I can send messages from the j2me client to
python server, but cant receive from the python bluetooth client to
j2me server, it only connects but doesnt receive??.I can send copy of
code on request.
I'm using pybluez on python 2.6
and standard javax.bluetooth for the mobile interface. Any help wud be
welcome.
Thanks in advance.


From R.Brodie at rl.ac.uk  Wed May  6 04:45:24 2009
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Wed, 6 May 2009 09:45:24 +0100
Subject: thc v0.3 - txt to html converter - better code?
References: <gtppqc$7v1$1@news-cedar.fernuni-hagen.de>
	<4a008996$0$31862$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <gtrin4$7h5$1@south.jnrs.ja.net>


"Stefan Behnel" <stefan_ml at behnel.de> wrote in message 
news:4a008996$0$31862$9b4e6d93 at newsspool3.arcor-online.net...

>    language_map = {'English': 'EN', 'Deutsch': 'DE'}
>    strict_or_transitional = {True: 'Transitional', False: 'Strict'}
>
>    # this will raise a KeyError for unknown languages
>    language = language_map[ self.cmboBoxLang.currentText() ]
>
>    # this assumes that isChecked() returns True or False
>    spec = strict_or_transitional[self.rdioBtnTransitional.isChecked()]
>
>    doctype = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 %s/%s">\n' % (
>        spec, language)

Incidentally, the language in an HTML DOCTYPE refers to the language of the DTD, not
the document. It's never correct to use //DE in an HTML page, unless you have a custom
(German) DTD. So the code can be improved further by cutting that part out.

    strict_or_transitional = {True: 'Transitional', False: 'Strict'}

    # this assumes that isChecked() returns True or False
    spec = strict_or_transitional[self.rdioBtnTransitional.isChecked()]

    doctype = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 %s//EN">\n' % spec




From digitig at gmail.com  Wed May  6 04:46:43 2009
From: digitig at gmail.com (Tim Rowe)
Date: Wed, 6 May 2009 09:46:43 +0100
Subject: Which one is best Python or Java for developing GUI applications?
In-Reply-To: <gtreu8$f64$1@ger.gmane.org>
References: <793408.86105.qm@web7903.mail.in.yahoo.com>
	<gtreu8$f64$1@ger.gmane.org>
Message-ID: <aee48b3c0905060146t3ada829eucfc0d79cc8be9c67@mail.gmail.com>

2009/5/6 Dennis Lee Bieber <wlfraed at ix.netcom.com>:

> (the "near" is because I feel Ada is
> stricter than any other language)

Try SPARK -- it's Ada based, but /much/ stricter. It's just right for
some really critical stuff, but is no sort of an answer to "Which one
is best Python or Java for developing GUI"!

-- 
Tim Rowe


From paul.sijben at xs4all.nl  Wed May  6 04:51:34 2009
From: paul.sijben at xs4all.nl (Paul Sijben)
Date: Wed, 06 May 2009 10:51:34 +0200
Subject: desperately looking for a howto on running my wxPython app on
	Vista
In-Reply-To: <1f97707a-9fd8-45d0-8aa6-142ce16b1951@e24g2000vbe.googlegroups.com>
References: <49f6d607$0$199$e4fe514c@news.xs4all.nl>
	<mailman.4711.1240940347.11746.python-list@python.org>
	<mailman.4750.1240996642.11746.python-list@python.org>
	<fb1229dc-1fd9-49c7-8b21-5c4326b53c93@u39g2000pru.googlegroups.com>
	<4A006CCD.5060901@xs4all.nl>
	<1f97707a-9fd8-45d0-8aa6-142ce16b1951@e24g2000vbe.googlegroups.com>
Message-ID: <4A014F96.5090004@xs4all.nl>

Mike Driscoll wrote:
> 
> 
> Hmmm...I'm not familiar with that DLL, but a little googling seems to
> indicate that you may be able to get it off your installation CD:

it actually is there on my system. So this may be the red herring the
Dependency Walker FAQ is warning for....

maybe I should leave this mess and revert to python 2.5....

> 
> http://www.techimo.com/forum/applications-operating-systems/76550-winxp-msgina-dll-shlwapi-dll-problem.html
> 
> The link above gives the steps for XP, but Vista will probably be
> similar. I don't know for sure, but you may have to register the dll
> once you've got it copied back onto your machine.
> 
> Mike


From davea at ieee.org  Wed May  6 04:57:00 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 06 May 2009 04:57:00 -0400
Subject: pyc files problem
In-Reply-To: <op.uthr26pwx6zn5v@lepton.softlabbsas.com.ar>
References: <c4ab18df0905052043s5a2d4cbena7888fa4fcea366@mail.gmail.com>
	<op.uthr26pwx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4A0150DC.5050909@ieee.org>

Gabriel Genellina wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">En Wed, 
> 06 May 2009 00:43:25 -0300, Mohamed Lrhazi <lrhazi at gmail.com> escribi?:
>
>> My code sends a pointer to a Python function to a C library, using
>> ctypes module. When my program restarts, after a crash or normal
>> exit... it cannot start again without sigfaulting
>
> Do you mean that, if you delete the .pyc files your program runs 
> properly, but if you keep the .pyc files your program crashes?
> That's very strange...
>
>> What is the proper way around this problem? other than adding code to
>> delete the cache files?
>
> There is no "proper way around" the problem; it should not exist in 
> the first place!
>
> Have you read the note at the end of the "Callback" section in the 
> ctypes documentation?
> """Important note for callback functions:
>
> Make sure you keep references to CFUNCTYPE objects as long as they are 
> used from C code. ctypes doesn't, and if you don't, they may be 
> garbage collected, crashing your program when a callback is made."""
>
> There is a ctypes-specific list: 
> https://lists.sourceforge.net/lists/listinfo/ctypes-users
>
1) Is it true (as Gabriel asks) that deleting the .pyc files solves the 
problem?
2) If so, have you investigated to see which one of them gets 
corrupted?  This isn't necessarily the problem, it could also be timing, 
or related to the order of the memory allocation pool.
3) When you get the segment fault, what does you C debugger show?  
What's happening at the time of the crash?
4) Is either the C code or the Python code multithreaded?
5) Are you running it under a Python debugger?



From rschroev_nospam_ml at fastmail.fm  Wed May  6 05:26:25 2009
From: rschroev_nospam_ml at fastmail.fm (Roel Schroeven)
Date: Wed, 06 May 2009 11:26:25 +0200
Subject: list comprehension question
In-Reply-To: <9086e914-3875-491c-8c88-ae697157b40f@o27g2000vbd.googlegroups.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5115.1241546468.11746.python-list@python.org>
	<a7974919-a216-42a8-bcb8-a57310501e85@z16g2000prd.googlegroups.com>
	<9086e914-3875-491c-8c88-ae697157b40f@o27g2000vbd.googlegroups.com>
Message-ID: <5JcMl.11662$5S3.7978@newsfe05.ams2>

John Yeung schreef:
> Essentially, if you see [B A] over and over and over again, when
> finally confronted with LCs of more "elements", it's not immediately
> clear that the pattern of increasing nestedness is
> 
>   [B A] => [C A B] => [D A B C] => etc.
> 
> rather than
> 
>   [B A] => [C B A] => [D C B A] => etc.
> 
> Maybe we're wired wrong, but there are many of us who find the second
> pattern more logical, which is why it is so easy for us to mess up the
> order of the nesting in a more complex LC.

Indeed, that is exactly the reason why I find it difficult to read
nested loop comprehensions, and why I almost never use them.

-- 
The saddest aspect of life right now is that science gathers knowledge
faster than society gathers wisdom.
  -- Isaac Asimov

Roel Schroeven


From sasurve at gmail.com  Wed May  6 05:53:21 2009
From: sasurve at gmail.com (shruti surve)
Date: Wed, 6 May 2009 15:23:21 +0530
Subject: About ODFPY links
Message-ID: <862e00220905060253j290672acu86f18fc1bcd6bb2a@mail.gmail.com>

hey all,
 For my project, i am using ODFpy open office spreadsheets. I am creating
ledgers in python ie.ledger.py.  So when i run ledger.py, spreadsheet will
be opened in open office. since ledger is made of number of accounts, i am
creating multiple tables for all accounts in single spreadsheet. So, there
are number of tables in one spreadsheet.  Now i want create links in each
table of spreadsheet so that i can connect multiple tables. SO can anyone
please tell me how to create links in odfpy..
-------------- next part --------------
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From Lacrima.Maxim at gmail.com  Wed May  6 06:08:08 2009
From: Lacrima.Maxim at gmail.com (Lacrima)
Date: Wed, 6 May 2009 03:08:08 -0700 (PDT)
Subject: Checking for required arguments when instantiating class.
Message-ID: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>

Hello!

For example I have two classes:

>>> class First:
	def __init__(self, *args, **kwargs):
		pass

>>> class Second:
	def __init__(self, somearg, *args, **kwargs):
		self.somearg = somearg

How can I test that First class takes 1 required argument and Second
class takes no required arguments?
So that I could instantiate them in a for loop.

>>> a = [First, Second]
>>> for cls in a:
	instance = cls()

Traceback (most recent call last):
  File "<pyshell#22>", line 2, in <module>
    instance = cls()
TypeError: __init__() takes at least 2 arguments (1 given)

Of course, I can do like this:
>>> for cls in a:
	try:
		instance = cls()
	except TypeError:
		instance = cls('hello')

>>> print instance.somearg
hello

But what if I have to instantiate any class with 3 or 4 required
arguments? How can I do it?

With regards,
Max


From Lacrima.Maxim at gmail.com  Wed May  6 06:11:58 2009
From: Lacrima.Maxim at gmail.com (Lacrima)
Date: Wed, 6 May 2009 03:11:58 -0700 (PDT)
Subject: Checking for required arguments when instantiating class.
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
Message-ID: <7c16b282-298a-4593-9872-bc63d6edff15@t11g2000vbc.googlegroups.com>

> >>> class First:
>
> ? ? ? ? def __init__(self, *args, **kwargs):
> ? ? ? ? ? ? ? ? pass
>
> >>> class Second:
>
> ? ? ? ? def __init__(self, somearg, *args, **kwargs):
> ? ? ? ? ? ? ? ? self.somearg = somearg
>
> How can I test that First class takes 1 required argument and Second
> class takes no required arguments?


Sorry, I have made a mistake. Of course, Second class takes 1 required
argument, not First.


From marco at sferacarta.com  Wed May  6 06:21:45 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Wed, 06 May 2009 12:21:45 +0200
Subject: what's the best way to call a method of object without a guarantee
	of its existence
In-Reply-To: <0348bb8e-3c1a-410d-a886-352b9b0ae391@e23g2000vbe.googlegroups.com>
References: <22690572-e338-483a-a99a-85ccf6c5fae6@x6g2000vbg.googlegroups.com>
	<9uULl.4199$Ux.2825@tornado.fastwebnet.it>
	<0348bb8e-3c1a-410d-a886-352b9b0ae391@e23g2000vbe.googlegroups.com>
Message-ID: <1xdMl.5391$Ux.3483@tornado.fastwebnet.it>

Leon wrote:

> So I need to go back to the module including "parent" class
> to define the objects that I maybe use in future as None,

You can assign them to a placeholder, with a method that always exists 
but does nothing.

class NullObject(object):
     def method(self, *args, **kw):
         pass


> actually, the module including "parent' class works very well
> without those definitions, from parent class's point of view,
> those definitions are kind of noisy.

If you don't feel the need to define the instances there, maybe they 
don't belong to that class after all.




From clp2 at rebertia.com  Wed May  6 06:28:53 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 6 May 2009 03:28:53 -0700
Subject: Checking for required arguments when instantiating class.
In-Reply-To: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
Message-ID: <50697b2c0905060328g3c3557cbw3fecc2b8b65b8f8e@mail.gmail.com>

On Wed, May 6, 2009 at 3:08 AM, Lacrima <Lacrima.Maxim at gmail.com> wrote:
> Hello!
>
> For example I have two classes:
>
>>>> class First:
> ? ? ? ?def __init__(self, *args, **kwargs):
> ? ? ? ? ? ? ? ?pass
>
>>>> class Second:
> ? ? ? ?def __init__(self, somearg, *args, **kwargs):
> ? ? ? ? ? ? ? ?self.somearg = somearg
>
> How can I test that First class takes 1 required argument and Second
> class takes no required arguments?

import inspect
args, varargs, varkw, defaults = inspect.getargspec(klass)
num_args_reqd = len(args) - (0 if defaults is None else len(defaults))

However, it sounds like a code smell that you're instanciating unknown
classes that don't share a common constructor signature.

Cheers,
Chris
-- 
http://blog.rebertia.com


From sion at viridian.paintbox  Wed May  6 06:32:40 2009
From: sion at viridian.paintbox (Sion Arrowsmith)
Date: Wed, 06 May 2009 10:32:40 GMT
Subject: object query assigned variable name?
References: <mailman.5142.1241589396.11746.python-list@python.org>
Message-ID: <cHdMl.15285$iK7.190@newsfe08.ams2>

John O'Hagan  <research at johnohagan.com> wrote:
>I guess what I meant was that if I type:
>
>brian = Brian()
>
>in the python shell and then hit return, it seems to me that _somewhere_ (in 
>the interpreter? I have no idea how it's done) it must be written that the 
>new Brian object will later be assigned the name "brian", even as the process 
>of creating the instance begins. As you've just demonstrated, the actual 
>assignment occurs afterwards.

As far as CPython goes, the parser (presumably) knows, but the
bytecode interpreter doesn't (without looking ahead), and you
can't assume you've got anything more than the bytecode.

This is what I should've done in the first place:

>>> def f():
...     messiah = Brian()
...
>>> import dis
>>> dis.dis(f)
  2           0 LOAD_GLOBAL              0 (Brian)
              3 CALL_FUNCTION            0
              6 STORE_FAST               0 (messiah)
              9 LOAD_CONST               0 (None)
             12 RETURN_VALUE
>>>

So while the information might be there, I'm not sure how you
could make use of it without going into bytecodehacks territory.

-- 
\S

   under construction



From lie.1296 at gmail.com  Wed May  6 06:51:47 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 06 May 2009 10:51:47 GMT
Subject: Checking for required arguments when instantiating class.
In-Reply-To: <7c16b282-298a-4593-9872-bc63d6edff15@t11g2000vbc.googlegroups.com>
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
	<7c16b282-298a-4593-9872-bc63d6edff15@t11g2000vbc.googlegroups.com>
Message-ID: <7ZdMl.9024$y61.7026@news-server.bigpond.net.au>

Lacrima wrote:
>>>>> class First:
>>         def __init__(self, *args, **kwargs):
>>                 pass
>>
>>>>> class Second:
>>         def __init__(self, somearg, *args, **kwargs):
>>                 self.somearg = somearg
>>
>> How can I test that First class takes 1 required argument and Second
>> class takes no required arguments?
> 
> 
> Sorry, I have made a mistake. Of course, Second class takes 1 required
> argument, not First.

Of course, it is possible to just try it one-by-one with a try block and 
a while loop (as long as your class/function doesn't rely/change on some 
global state (e.g. files, global variable, GUI, etc) while 
initializing/called), but if you really need that, there is something 
seriously wrong with the class/function design. You should check the 
help and determine how many and what are all the arguments meant.

In case you're wondering, this is how it would look like:

 >>> def f0():
...     print
...
 >>> def f1(a):
...     print a
...
 >>> def f2(a, b):
...     print a, b
...
 >>> def f2a(a, b, *args, **kargs):
...     print a, b, args, kargs
...
 >>> import itertools
 >>> funclist = [f0, f1, f2, f2a]
 >>> for f in funclist:
...     for i in itertools.count():
...         try:
...             f(*range(i))
...         except TypeError:
...             pass
...         else:
...             print 'Function %s takes %s required arguments' % 
(f.__name__, i)
...             break
...

Function f0 takes 0 required arguments
0
Function f1 takes 1 required arguments
0 1
Function f2 takes 2 required arguments
0 1 () {}
Function f2a takes 2 required arguments
 >>>


From lie.1296 at gmail.com  Wed May  6 07:49:15 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 06 May 2009 11:49:15 GMT
Subject: Self function
In-Reply-To: <mailman.5100.1241526783.11746.python-list@python.org>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>	<50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com>
	<mailman.5100.1241526783.11746.python-list@python.org>
Message-ID: <%OeMl.9036$y61.4364@news-server.bigpond.net.au>

Luis Zarrabeitia wrote:
> Btw, is there any way to inject a name into a function's namespace? Following 
> the python tradition, maybe we should try to create a more general solution!

How about a mechanism to pass arguments that are optional to accept?

So (in the general case) the caller can call a function with certain 
arguments, but unless the function explicitly accept it, the argument 
will be discarded.

With this, the injecting a local would simply be a case of adding an "I 
accept the argument" statement.


Sort of like this:

def func():
     ''' I reject '''
     pass

func(@somearg='Feel free to accept this arg')

def func(@somearg):
     ''' I accept '''
     print(somearg)

func(@somearg='Feel free to accept this arg')


Then on the case of injecting locals is simply by wrapping the function 
with a function that will inject various argument to the function and 
the function selectively choose which arguments they want to accept.

def needinfo(f):
     # let's assume there is an inspect code here
     func(@__name__=yournameis,
          @__call__=yourfunction,
          @__code__=yourcode,
          @__yoursub__=youryo,
          @__yourlim__=yoururso,
          @__yourina__=yournisk,
          @__yourlmes__=youridna,
          @__yoursage__=yourpped
     )

@needinfo
def func(@__name__, @__call__):
     print 'Hi, my name is %s and to call me press %s' % (__name__, 
__call__)

Does it sounds like a feature smell?


From piet at cs.uu.nl  Wed May  6 07:57:26 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 06 May 2009 13:57:26 +0200
Subject: object query assigned variable name?
References: <mailman.5142.1241589396.11746.python-list@python.org>
Message-ID: <m263gemok9.fsf@cs.uu.nl>

>>>>> John O'Hagan <research at johnohagan.com> (JO) wrote:

>JO> I guess what I meant was that if I type:

>JO> brian = Brian()

>JO> in the python shell and then hit return, it seems to me that
>JO> _somewhere_ (in the interpreter? I have no idea how it's done) it
>JO> must be written that the new Brian object will later be assigned
>JO> the name "brian", even as the process of creating the instance
>JO> begins. As you've just demonstrated, the actual assignment occurs
>JO> afterwards.

No, that's not how it works. There is no `preparation' for the
assignment and there is no reason for it. Look at the generated
byte code for this Python code:

def test():
    class Brian:
        def __init__(self):
            print "I'm Brian!"
    brian = Brian()

2           0 LOAD_CONST               1 ('Brian')
              3 LOAD_CONST               3 (())
              6 LOAD_CONST               2 (<code object Brian at 0x35728, file "<stdin>", line 2>)
              9 MAKE_FUNCTION            0
             12 CALL_FUNCTION            0
             15 BUILD_CLASS         
             16 STORE_FAST               0 (Brian)

  5          19 LOAD_FAST                0 (Brian)
             22 CALL_FUNCTION            0
             25 STORE_FAST               1 (brian)
             28 LOAD_CONST               0 (None)
             31 RETURN_VALUE        

You can see that the assignment (STORE_FAST) is done after the method
call (CALL_FUNCTION) and there is no reference to the variable name
before the call.

If you do a parallel assignment the relationship becomes even less:

brian, test = Brian(), 1

  5          19 LOAD_FAST                0 (Brian)
             22 CALL_FUNCTION            0
             25 LOAD_CONST               3 (1)
             28 ROT_TWO             
             29 STORE_FAST               1 (brian)
             32 STORE_FAST               2 (test)

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From deets at nospam.web.de  Wed May  6 08:07:58 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 06 May 2009 14:07:58 +0200
Subject: Install Python 3.0 dmg to macos 10.5
References: <627526f7-ac27-4874-b234-13d1a13accf5@y33g2000prg.googlegroups.com>
Message-ID: <76dcpuF1cbhk2U1@mid.uni-berlin.de>

silverburgh wrote:

> Hi,
> 
> If I install python 3.0 dmg, will it wipe out the existing python
> installation on macos 10.5 (i don't know how the original python was
> installed ( i think it is version 2.5).

No. The original is under /System/Library/Frameworks/Python.framework (and
should be kept there & not touched), and other installs are
under /Library/Frameworks/Python.framework

Diez


From phd at phd.pp.ru  Wed May  6 08:09:13 2009
From: phd at phd.pp.ru (Oleg Broytmann)
Date: Wed, 6 May 2009 16:09:13 +0400
Subject: SQLObject 0.9.10
Message-ID: <20090506120913.GB15968@phd.pp.ru>

Hello!

I'm pleased to announce version 0.9.10, a minor bugfix release of 0.9 branch
of SQLObject.


What is SQLObject
=================

SQLObject is an object-relational mapper.  Your database tables are described
as classes, and rows are instances of those classes.  SQLObject is meant to be
easy to use and quick to get started with.

SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).


Where is SQLObject
==================

Site:
http://sqlobject.org

Development:
http://sqlobject.org/devel/

Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss

Archives:
http://news.gmane.org/gmane.comp.python.sqlobject

Download:
http://cheeseshop.python.org/pypi/SQLObject/0.9.10

News and changes:
http://sqlobject.org/News.html


What's New
==========

News since 0.9.9
----------------

* Another unicode-related patch for MySQL; required because different
  versions of MySQLdb require different handling::

   - MySQLdb < 1.2.1: only ascii
   - MySQLdb = 1.2.1: only unicode
   - MySQLdb > 1.2.1: both ascii and unicode

* Setup requires FormEncode version 1.1.1+.

* Fixed a minor bug - pass name to DecimalValidator.

* Fixed a bug in InheritableIteration - pass connection to child
  klass.select().

* A bug was fixed in PostgresConnection.columnsFromSchema() - foreign keys
  are now recognized and created as proper ForeignKey with correct
  column name and table name.

* Bugs in PostgresConnection and MSSQLConnection related to properties was
  fixed. A note for developers: from now on properties in DBConnection
  classes are forbidden as they don't work with Transaction -
  Transaction.__getattr__() cannot properly wrap 'self' so a property is
  called with wrong 'self'.

* Transaction instances now explicitly raises TypeError on close() -
  without this calling Transaction.close() calls connection.close() which
  is wrong.

* A bug in SQLiteConnection.columnsFromSchema() that led to an infinite
  loop was fixed.

For a more complete list, please see the news:
http://sqlobject.org/News.html

Oleg.
-- 
     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.


From phd at phd.pp.ru  Wed May  6 08:19:34 2009
From: phd at phd.pp.ru (Oleg Broytmann)
Date: Wed, 6 May 2009 16:19:34 +0400
Subject: SQLObject 0.10.5
Message-ID: <20090506121934.GF15968@phd.pp.ru>

Hello!

I'm pleased to announce version 0.10.5, a minor bugfix release of 0.10 branch
of SQLObject.


What is SQLObject
=================

SQLObject is an object-relational mapper.  Your database tables are described
as classes, and rows are instances of those classes.  SQLObject is meant to be
easy to use and quick to get started with.

SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).


Where is SQLObject
==================

Site:
http://sqlobject.org

Development:
http://sqlobject.org/devel/

Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss

Archives:
http://news.gmane.org/gmane.comp.python.sqlobject

Download:
http://cheeseshop.python.org/pypi/SQLObject/0.10.5

News and changes:
http://sqlobject.org/News.html


What's New
==========

News since 0.10.4
-----------------

* Another unicode-related patch for MySQL; required because different
  versions of MySQLdb require different handling::

   - MySQLdb < 1.2.1: only ascii
   - MySQLdb = 1.2.1: only unicode
   - MySQLdb > 1.2.1: both ascii and unicode

* Setup requires FormEncode version 1.1.1+.

* Fixed a minor bug - pass name to DecimalValidator.

* Fixed a bug in InheritableIteration - pass connection to child
  klass.select().

* sqlmeta.getColumns() becomes classmethod.

* A bug was fixed in PostgresConnection.columnsFromSchema() - foreign keys
  are now recognized and created as proper ForeignKey with correct
  column name and table name.

* Bugs in PostgresConnection and MSSQLConnection related to properties was
  fixed. A note for developers: from now on properties in DBConnection
  classes are forbidden as they don't work with Transaction -
  Transaction.__getattr__() cannot properly wrap 'self' so a property is
  called with wrong 'self'.

* Transaction instances now explicitly raises TypeError on close() -
  without this calling Transaction.close() calls connection.close() which
  is wrong.

* A bug in SQLiteConnection.columnsFromSchema() that led to an infinite
  loop was fixed.

For a more complete list, please see the news:
http://sqlobject.org/News.html

Oleg.
-- 
     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.


From piet at cs.uu.nl  Wed May  6 08:24:59 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 06 May 2009 14:24:59 +0200
Subject: Checking for required arguments when instantiating class.
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
Message-ID: <m21vr2mnac.fsf@cs.uu.nl>

>>>>> Lacrima <Lacrima.Maxim at gmail.com> (L) wrote:

>L> Hello!
>L> For example I have two classes:

>>>>> class First:
>L> 	def __init__(self, *args, **kwargs):
>L> 		pass

>>>>> class Second:
>L> 	def __init__(self, somearg, *args, **kwargs):
>L> 		self.somearg = somearg

>L> How can I test that First class takes 1 required argument and Second
>L> class takes no required arguments?
>L> So that I could instantiate them in a for loop.

>>>>> a = [First, Second]
>>>>> for cls in a:
>L> 	instance = cls()

>L> Traceback (most recent call last):
>L>   File "<pyshell#22>", line 2, in <module>
>L>     instance = cls()
>L> TypeError: __init__() takes at least 2 arguments (1 given)

>L> Of course, I can do like this:
>>>>> for cls in a:
>L> 	try:
>L> 		instance = cls()
>L> 	except TypeError:
>L> 		instance = cls('hello')

>>>>> print instance.somearg
>L> hello

>L> But what if I have to instantiate any class with 3 or 4 required
>L> arguments? How can I do it?

cls.__init__.im_func.__code__.co_argcount

This will include self, so it will be 1 in First and 2 in Second.

However this is very dirty trickery and should not be recommended. It
may also change in future versions and other implementations of Python.

I think it would be cleaner to put a class attribute in the classes that
defines how they should be initialized (e.g. just the number of required
arguments or more specific information) or have a special factory method
for this use case.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From clp2 at rebertia.com  Wed May  6 08:36:48 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 6 May 2009 05:36:48 -0700
Subject: Checking for required arguments when instantiating class.
In-Reply-To: <m21vr2mnac.fsf@cs.uu.nl>
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
	<m21vr2mnac.fsf@cs.uu.nl>
Message-ID: <50697b2c0905060536u4063f9c9g63c5d832d86da017@mail.gmail.com>

On Wed, May 6, 2009 at 5:24 AM, Piet van Oostrum <piet at cs.uu.nl> wrote:
>>>>>> Lacrima <Lacrima.Maxim at gmail.com> (L) wrote:
>
>>L> Hello!
>>L> For example I have two classes:
>
>>>>>> class First:
>>L> ? ? def __init__(self, *args, **kwargs):
>>L> ? ? ? ? ? ? pass
>
>>>>>> class Second:
>>L> ? ? def __init__(self, somearg, *args, **kwargs):
>>L> ? ? ? ? ? ? self.somearg = somearg
>
>>L> How can I test that First class takes 1 required argument and Second
>>L> class takes no required arguments?
>>L> So that I could instantiate them in a for loop.
>
>>>>>> a = [First, Second]
>>>>>> for cls in a:
>>L> ? ? instance = cls()
>
>>L> Traceback (most recent call last):
>>L> ? File "<pyshell#22>", line 2, in <module>
>>L> ? ? instance = cls()
>>L> TypeError: __init__() takes at least 2 arguments (1 given)
>
>>L> Of course, I can do like this:
>>>>>> for cls in a:
>>L> ? ? try:
>>L> ? ? ? ? ? ? instance = cls()
>>L> ? ? except TypeError:
>>L> ? ? ? ? ? ? instance = cls('hello')
>
>>>>>> print instance.somearg
>>L> hello
>
>>L> But what if I have to instantiate any class with 3 or 4 required
>>L> arguments? How can I do it?
>
> cls.__init__.im_func.__code__.co_argcount
>
> This will include self, so it will be 1 in First and 2 in Second.

AFAICT, that would count non-required arguments too, which isn't
strictly what the OP requested.

> However this is very dirty trickery and should not be recommended. It
> may also change in future versions and other implementations of Python.

Very much agreed.

> I think it would be cleaner to put a class attribute in the classes that
> defines how they should be initialized (e.g. just the number of required
> arguments or more specific information) or have a special factory method
> for this use case.

Seconded. I'd recommend the latter personally, though it's impossible
to give a definitive answer without more context.

Cheers,
Chris
-- 
http://blog.rebertia.com


From castironpi at gmail.com  Wed May  6 08:56:17 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Wed, 6 May 2009 05:56:17 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com> 
	<4a69c949-ace7-47d9-8bb7-d05bc6c895f3@s31g2000vbp.googlegroups.com> 
	<50222a39-88d0-49da-9105-2d3a47af5940@r34g2000vba.googlegroups.com> 
	<5b81cccc-c174-42bd-b4a0-638755ca9e03@l5g2000vbc.googlegroups.com> 
	<57b22b7c-1130-4f28-a7b7-bd119445de41@z19g2000vbz.googlegroups.com>
Message-ID: <507794a3-acc3-49f7-a418-4b1bf27c6a9e@s16g2000vbp.googlegroups.com>

On May 6, 2:23?am, Arnaud Delobelle <arno... at googlemail.com> wrote:
> On May 5, 10:20?pm, Aaron Brady <castiro... at gmail.com> wrote:
>
> > def auto( f ):
> > ? ? def _inner( *ar, **kw ):
> > ? ? ? ? return f( _inner, *ar, **kw )
> > ? ? return _inner
>
> Quoting myself near the start of this thread:
>
> Here's an idea:
>
> >>> def bindfunc(f):
>
> ... ? ? def boundf(*args, **kwargs):
> ... ? ? ? ? return f(boundf, *args, **kwargs)
> ... ? ? return boundf
>
> --
> Arnaud

Yeah, but that was two days ago.


From castironpi at gmail.com  Wed May  6 08:57:34 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Wed, 6 May 2009 05:57:34 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com> 
	<mailman.5100.1241526783.11746.python-list@python.org>
	<%OeMl.9036$y61.4364@news-server.bigpond.net.au>
Message-ID: <c31f057b-6d97-4075-9a9d-47ed335d44df@r3g2000vbp.googlegroups.com>

On May 6, 6:49?am, Lie Ryan <lie.1... at gmail.com> wrote:
> Luis Zarrabeitia wrote:
> > Btw, is there any way to inject a name into a function's namespace? Following
> > the python tradition, maybe we should try to create a more general solution!
>
> How about a mechanism to pass arguments that are optional to accept?
>
> So (in the general case) the caller can call a function with certain
> arguments, but unless the function explicitly accept it, the argument
> will be discarded.
>
> With this, the injecting a local would simply be a case of adding an "I
> accept the argument" statement.
snip

You could write a decorator to do that with the inspect module, or you
could just accept a keyword dict for extra as-desired args.


From castironpi at gmail.com  Wed May  6 09:04:20 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Wed, 6 May 2009 06:04:20 -0700 (PDT)
Subject: object query assigned variable name?
References: <mailman.5142.1241589396.11746.python-list@python.org>
Message-ID: <e1a5d19f-9db1-4e72-882c-12cd37b0a33f@o14g2000vbo.googlegroups.com>

On May 6, 12:56?am, John O'Hagan <resea... at johnohagan.com> wrote:
> On Tue, 5 May 2009, Sion Arrowsmith wrote:
> > John O'Hagan ?<resea... at johnohagan.com> wrote:
> > >I can see that it's tantalizing, though, because _somebody_ must know
> > > about the assignment; after all, we just executed it!
>
> > Except we haven't, if we're talking about reporting from the
>
> > object's __init__:
> > >>> class Brian:
>
> > ... ? ? def __init__(self):
> > ... ? ? ? ? print "I'm Brian!"
> > ...
>
> > >>> l = []
> > >>> l[1] = Brian()
>
> > I'm Brian!
> > Traceback (most recent call last):
> > ? File "<stdin>", line 1, in <module>
> > IndexError: list assignment index out of range
>
> > (Yeah, I know that's a setitem call not an assignment. Point stands.
> > It also demonstrates why the whole idea of "what name is a newly-
> > created object assigned to" is broken.)
>
> I guess what I meant was that if I type:
>
> brian = Brian()
>
> in the python shell and then hit return, it seems to me that _somewhere_ (in
> the interpreter? I have no idea how it's done) it must be written that the
> new Brian object will later be assigned the name "brian", even as the process
> of creating the instance begins. As you've just demonstrated, the actual
> assignment occurs afterwards.
>
> But even if this is true I'm guessing it'd be black magic to get to it.
>
> Regards,
>
> John

In principle, you can't get all the names an object is bound to, since
it might be a temporary value or member of a container at some time.
If it was in a dictionary, would you want its key?  Or sequence and
index?

Furthermore, we don't have a data structure for two-way lookup.
Sometimes you would want to lookup name by object, sometimes object by
name.

Lastly, it would make code significantly less readable </subjective>.


From OldGrantonian at googlemail.com  Wed May  6 09:37:33 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Wed, 6 May 2009 06:37:33 -0700 (PDT)
Subject: Separate Windows versions of Python
Message-ID: <52b28a62-d0de-4d26-b2bd-dc4bf2affb71@p4g2000vba.googlegroups.com>

I use Windows Vista Home Premium. I have Python 2.6 currently
installed. I'm not a techy.

I want to use "virtualenv". When I try to install the latest version
of virtualenv for Windows, I get the message that Python 2.5 is not
found.

How do I install Python 2.5 (or anything else except 2.6) so that I
use the correct version of Python at the correct time.

For example, do I need to edit the "path" variable each time that I
want to change versions from 2.5 to 2.6?


From tornadomaker at gmx.net  Wed May  6 09:41:12 2009
From: tornadomaker at gmx.net (Mike)
Date: Wed, 6 May 2009 06:41:12 -0700 (PDT)
Subject: pyinstaller and logging
Message-ID: <f77c51e8-9b7e-44cc-b7bb-1d7c723b7764@o20g2000vbh.googlegroups.com>

Pyinstaller seems to have a problem with logging ...

 I installed pyinstaller 1.3 - using it together with Python 2.6. I
used pyinstaller for a small project, the created .exe worked fine.
After some additional changes to my project I got strange run time
errors when running the .exe (but no problems when running the .py
file directly with the python interpreter). I stripped down my program
and tracked the problem down to the first log message being written.

So this is a stripped down version of the python script:

import logging
logging.basicConfig(level=logging.INFO,
                    format='%(asctime)-15s %(levelname)-8s %(message)
s',
                    datefmt='%Y-%m-%d %H:%M:%S',
                    filename="test1.log",
                    filemode='w')
print "written via print"
logging.info("written via logging")

when I start this from the python shell I am getting
           IDLE 2.6.2      ==== No Subprocess ====
           >>>
           written via print
           >>>
and test1.log contains
           2009-05-05 19:39:52 INFO     written via logging
as expected.

When I start test1.exe I am getting

written via print
Traceback (most recent call last):
  File "<string>", line 8, in <module>
  File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
\v0r0m2\buildtest1\out1.pyz/logging", line 1451, in info
  File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
\v0r0m2\buildtest1\out1.pyz/logging", line 1030, in info
  File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
\v0r0m2\buildtest1\out1.pyz/logging", line 1142, in _log
  File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
\v0r0m2\buildtest1\out1.pyz/logging", line 1117, in makeRecord
  File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
\v0r0m2\buildtest1\out1.pyz/logging", line 272, in __init__
  File "C:\Programme\pyinstaller-1.3\iu.py", line 312, in importHook
    mod = _self_doimport(nm, ctx, fqname)
  File "C:\Programme\pyinstaller-1.3\iu.py", line 398, in doimport
    exec co in mod.__dict__
  File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
\v0r0m2\buildtest1\out1.pyz/multiprocessing", line 83, in <module>
  File "C:\Programme\pyinstaller-1.3\iu.py", line 312, in importHook
    mod = _self_doimport(nm, ctx, fqname)
  File "C:\Programme\pyinstaller-1.3\iu.py", line 382, in doimport
    mod = director.getmod(nm)
  File "C:\Programme\pyinstaller-1.3\iu.py", line 215, in getmod
    mod = owner.getmod(nm)
  File "C:\Programme\pyinstaller-1.3\iu.py", line 77, in getmod
    mod = imp.load_module(nm, fp, attempt, (ext, mode, typ))
TypeError: importHook() takes at most 5 arguments (6 given)

What am I doing wrong?


From james at agentultra.com  Wed May  6 09:48:51 2009
From: james at agentultra.com (J Kenneth King)
Date: Wed, 06 May 2009 09:48:51 -0400
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5109.1241543371.11746.python-list@python.org>
Message-ID: <85d4am8hq4.fsf@agentultra.com>

Emile van Sebille <emile at fenx.com> writes:

> On 5/5/2009 9:15 AM J Kenneth King said...
>
>> List comprehensions can make a reader of your code apprehensive
>> because it can read like a run-on sentence and thus be difficult to
>> parse. The Python documentation discourages their use and I believe
>> for good reason.
>
> Can you provide a link for this?  I'd like to see specifically what's
> being discouraged, as I'd be surprised to find routine usage frowned
> upon.
>
> Emile

http://docs.python.org/tutorial/datastructures.html#nested-list-comprehensions


"If you?ve got the stomach for it, list comprehensions can be
nested. They are a powerful tool but ? like all powerful tools ? they
need to be used carefully, if at all."

and

"In real world, you should prefer builtin functions to complex flow
statements."


From mauriceling at gmail.com  Wed May  6 10:08:24 2009
From: mauriceling at gmail.com (mauriceling@acm.org)
Date: Wed, 6 May 2009 07:08:24 -0700 (PDT)
Subject: [ANN] Completion of The Python Papers Volume 4 Issue 1
Message-ID: <8b10356e-1a40-424b-b288-bbc3fa6f7d39@x29g2000prf.googlegroups.com>

Welcome to Issue 4 Volume 1 of The Python Papers. This marks our 4th
year in business. It is my pleasure to announce 4 improvements made to
The Python Papers Anthology.

Firstly, we had created a class of editorial members in our team ? the
Editorial Reviewers (ER). This is in addition to the existing Editors-
in-Chief (EIC) and Associate Editors (AE). In the words of our revised
editorial policy, ?ER is a tier of editors deemed to have in-depth
expertise knowledge in specialized areas. As members of the editorial
board, ERs are accorded editorial status but are generally not
involved in the strategic and routine operations of the periodicals
although their
expert opinions may be sought at the discretion of EIC.? To this
aspect, we are glad to have Jacob Kaplan-Moss (President, Django
Software Foundation; Partner, Revolution Systems, LLC; Co-BDFL,
Django) as our first ER. Welcome aboard.

Secondly, we had adopted a fast publication scheme. In the past,
accepted manuscripts will only be published on the release date in the
month of April, August and December each year. With the use of Open
Journal System, we are able to publish manuscripts as they are being
accepted. This means that the release date in the month of April,
August and December is now effectively our closing date for the issue.
For example, manuscripts accepted after April 2009 will be routed to
immediate publication in Volume 4 Issue 2. This is to being
information faster to our readers, rather than waiting for a few
months.

Thirdly, we announce a set of manuscript templates for our authors and
contributors for their manuscript preparation. As such, we had
revamped our website (http://www.pythonpapers.org) to reflect these
changes.

Lastly, we are glad to announce the launch of our 2nd publication
under The Python Papers Anthology ? The Python Papers Source Codes
(ISSN 1836-621X). TPPSC, for short, is a collection of software and
source codes, usually associated with papers published in The Python
Papers and The Python Papers Monograph. These codes are refereed for
originality, accuracy, completeness, and lasting value. TPPSC will
act as a developers codebook of high-quality, peer-reviewed codes.
TPPSC is an annual publication using the same fast publication scheme.

We thank all our readers and contributors for their continued support.

Happy reading.

Maurice Ling
Co-EIC, TPPA


From exarkun at divmod.com  Wed May  6 10:10:40 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Wed, 6 May 2009 10:10:40 -0400
Subject: problem in using sendmail in multi thread
In-Reply-To: <f2453be6-12f3-4afd-be46-df6a3017fd0d@j18g2000prm.googlegroups.com>
Message-ID: <20090506141040.21531.104267133.divmod.quotient.836@henry.divmod.com>

On Tue, 5 May 2009 22:17:35 -0700 (PDT), gganesh <ganesh.gbg at gmail.com> wrote:
>On May 5, 9:25?pm, Piet van Oostrum <p... at cs.uu.nl> wrote:
>> >>>>> gganesh <ganesh.... at gmail.com> (g) wrote:
>> >g> hi,
>> >g> I'm a beginner in using Python script
>> >g> I'm trying to send mails using multi-thread
>> >g> I wrote
>> >g> FROM = 'ganeshx... at xxxx.com'
>> >g> # for more mail add';' the another mail id
>> >g> listTo = ['g.... at gmail.com', 'xxjango... at gmail.com',
>> >g> 'xx... at yahoo.co.in']
>> >g> SUBJECT = 'This is the subject'
>> >g> MSGBODY = 'This the body of the message '
>> >g> MAILSERVER = 'mail.xxxx.com'
>> >g> port = 25
>> >g> username = 'xxxxx'
>> >g> password = 'xxxxx'
>> >g> # trim the strings of any leading or trailing spaces
>> >g> FROM = FROM.strip()
>> >g> SUBJECT = SUBJECT.strip()
>> >g> MSGBODY = MSGBODY.strip()
>> >g> MAILSERVER = MAILSERVER.strip()
>> >g> username = username.strip()
>> >g> password = password.strip()
>> >g> #Connect to server
>> >g> print 'Connecting to mail server ', MAILSERVER
>> >g> try:
>> >g> ? ? ? s = smtplib.SMTP(MAILSERVER,port)
>>
>> You can't have a single SMTP connection that's used in multiple threads.
>> That is what causes the error. Each thread should have its own SMTP
>> connection. So move this code (above and below) into the run() method.
>>
>> >g> ? ? ? print 'connected'
>> >g> #s.set_debuglevel(1)
>> >g> except:
>> >g> ? ? ? ?print 'ERROR: Unable to connect to mail server', sys.exc_info ?()[0]
>> >g> ? ? ? ?sys.exit(1)
>> >g> #login to server
>> >g> if password <> '':
>> >g> ? ? ? print 'Logging into mail server'
>>
>> I think this try except block should be inside the if statement, i.e.
>> indented 4 spaces.
>>
>> >g> try:
>> >g> ? ? ? s.login(username,password)
>> >g> except:
>> >g> ? ? ? print 'ERROR: Unable to login to mail server', MAILSERVER
>> >g> ? ? ? print 'Please recheck your password'
>> >g> ? ? ? sys.exit(1)
>> >g> #--------------------------------------------------
>> >g> print "Starting Multi Thread Method"
>> >g> class MyThread(Thread):
>> >g> ? ? def __init__(self, site, s, FROM, MSGBODY):
>> >g> ? ? ? ? Thread.__init__(self)
>> >g> ? ? ? ? self.site = site
>> >g> ? ? ? self.s=s
>> >g> ? ? ? self.FROM=FROM
>> >g> ? ? ? self.MSGBODY=MSGBODY
>>
>> You give the s (connection) here as a parameter, store it in self.s and
>> never use that attribute.
>>
>> >g> ? ? def run(self):
>> >g> ? ? ? print "running for %s " %self.site
>> >g> ? ? ? s.sendmail(self.FROM, self.site, self.MSGBODY)
>>
>> Here you use the global s, not self.s
>>
>> As I said above you should do the SMTP connection setup, including the
>> login, here, and store the connection either in self.s or in a local
>> variable s in the method. As you don't use the s in another method, I
>> think a local variable is better.
>>
>> >g> ? ? ? print "Emailed for ?site %s" %self.site
>> >g> a= time.time()
>> >g> threads = []
>> >g> for site in listTo:
>> >g> ? ? T = MyThread(site,s,FROM,MSGBODY)
>> >g> ? ? threads.append(T)
>> >g> ? ? T.start()
>> >g> for i in threads:
>> >g> ? ? i.join()
>>
>> Of course the next 2 lines should also be moved to run().
>>
>> >g> s.quit()
>> >g> s.close()
>> >g> print "Took %s seconds" %str(time.time()-a)
>> >g> #-----------------------------------------------------
>>
>> --
>> Piet van Oostrum <p... at cs.uu.nl>
>> URL:http://pietvanoostrum.com[PGP 8DAE142BE17999C4]
>> Private email: p... at vanoostrum.org
>
>
>Thanks Everyone By your guidance the code worked fine
>I can send mails in multi threaded environment.
>Is this only way to send mails concurrently  or any other method
>aviable?

Here's another way:

    from twisted.mail.smtp import sendmail
    from twisted.internet import reactor
    from twisted.python.log import err

    MAILSERVER = ...
    listTo = [...]
    FROM = ...
    MSGBODY = ...

    done = sendmail(MAILSERVER, FROM, listTo, MSGBODY)
    done.addErrback(err)
    done.addCallback(lambda ignored: reactor.stop())
    reactor.run()

Jean-Paul


From piotrek at nonexistent.domain  Wed May  6 10:20:01 2009
From: piotrek at nonexistent.domain (Piotrek G.)
Date: Wed, 06 May 2009 16:20:01 +0200
Subject: Control a process interactively (pexpect) and save data
Message-ID: <gts6ad$8tn$1@news.task.gda.pl>

Hi,

I'm trying to use something like pexpect.interact() but I want to save 
all my inputs and save all outputs from the process (/bin/sh Linux).
The main goal is to record all sequence of commands and responses in 
order to automatically generate pexpect script.

My script is like below so far, but I'm unable to print responses to 
stdout and save it to variables/files/whatever.

p = pexpect.spawn('/bin/sh')
print "PID: " + str(p.pid)
p.logfile = sys.stdout
while True:
     if not p.isalive():
         print "Not alive"
         break
     else:
         print "Alive!"
     p.flush()
     bb = sys.stdin.readline()
     p.sendline(bb)
sys.exit(0)

pexpect.interact() doesn't allow to save input and output.

I tried pipes but I've found that "Don't use a pipe to control another 
application..." - http://edgysoftware.com/doc/python-pexpect/doc/

I tried subprocess module but it didn't allow me to control /bin/sh as 
communicate() method do as follows
"Interact with process: Send data to stdin. Read data from stdout and 
stderr, until end-of-file is reached. Wait for process to terminate. The 
optional input argument should be a string to be sent to the child 
process, or None, if no data should be sent to the child."

So it "waits for process to terminate" and I'm unable to interact...

Any suggestions?

Oh, and by the way my script works with /bin/sh but doesn't work with 
/bin/bash. If I enter 'exit' sh exits, bash does not... Why?

Thanks!
-- 
Regards
Piotrek


From aahz at pythoncraft.com  Wed May  6 10:39:50 2009
From: aahz at pythoncraft.com (Aahz)
Date: 6 May 2009 07:39:50 -0700
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
	<mailman.5031.1241420740.11746.python-list@python.org>
	<81f82d8c-80fa-4ba0-a402-3a8b5757a967@s16g2000vbp.googlegroups.com>
Message-ID: <gts7fm$qte$1@panix3.panix.com>

In article <81f82d8c-80fa-4ba0-a402-3a8b5757a967 at s16g2000vbp.googlegroups.com>,
Deep_Feelings  <doctoresam at gmail.com> wrote:
>
>anyone did that ? learning from python docs straight away ?

Yes.  Admittedly that was ten years ago and the docs have improved some
since then....
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From bborcic at gmail.com  Wed May  6 10:49:28 2009
From: bborcic at gmail.com (Boris Borcic)
Date: Wed, 06 May 2009 16:49:28 +0200
Subject: list comprehension question
In-Reply-To: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
Message-ID: <gts83i$32b$1@ger.gmane.org>

Ross wrote:
> If I have a list of tuples a = [(1,2), (3,4), (5,6)], and I want to
> return a new list of each individual element in these tuples, I can do
> it with a nested for loop but when I try to do it using the list
> comprehension b = [j for j in i for i in a], my output is b =
> [5,5,5,6,6,6] instead of the correct b = [1,2,3,4,5,6]. What am I
> doing wrong?
> --
> http://mail.python.org/mailman/listinfo/python-list
> 

just fyi, in python 2.6

list(itertools.chain.from_iterable(a))

would do it

in python 2.5

list(itertools.chain(*a))

would do it too, but I wouldn't try it with arbitrarily long a







From Scott.Daniels at Acm.Org  Wed May  6 10:57:00 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 06 May 2009 07:57:00 -0700
Subject: pyc files problem
In-Reply-To: <mailman.5146.1241600231.11746.python-list@python.org>
References: <c4ab18df0905052043s5a2d4cbena7888fa4fcea366@mail.gmail.com>	<op.uthr26pwx6zn5v@lepton.softlabbsas.com.ar>
	<mailman.5146.1241600231.11746.python-list@python.org>
Message-ID: <JZudnQEqyJKTOZzXnZ2dnUVZ_qSdnZ2d@pdx.net>

Dave Angel wrote:
> Gabriel Genellina wrote: ...
>> 06 May 2009 00:43:25 -0300, Mohamed Lrhazi <lrhazi at gmail.com> escribi?:
>>> My code sends a pointer to a Python function to a C library, using
>>> ctypes module. When my program restarts, after a crash or normal
>>> exit... it cannot start again without sigfaulting
>>
>> Do you mean that, if you delete the .pyc files your program runs 
>> properly, but if you keep the .pyc files your program crashes?
>> That's very strange...
>
> 1) Is it true (as Gabriel asks) that deleting the .pyc files solves the 
> problem?
> 2) If so, have you investigated to see which one of them gets 
> corrupted?  This isn't necessarily the problem, it could also be timing, 
> or related to the order of the memory allocation pool.
> 3) When you get the segment fault, what does you C debugger show?  
> What's happening at the time of the crash?
> 4) Is either the C code or the Python code multithreaded?
> 5) Are you running it under a Python debugger?
> 
Could this have to do with a manifest floating point constant
being a "Not A Number" or "Infinity"?  That is the last .pyc-
related problem I know about.

To the original poster:
Please give a _lot_ more detail about the full Python version,
OS type and version, and so on.  Otherwise, it becomes
tempting to say, "that is too bad, sorry you have troubles."
One way to isolate the problem (if it is, indeed .pyc-loading
related) is to delete individual .pyc files until you find the
suspect, then cut that one in pieces and re-isolate until you
have a small bit of code with the issue.  This is why we point
people to smart-questions(*) so often.

(*) http://www.catb.org/~esr/faqs/smart-questions.html

--Scott David Daniels
Scott.Daniels at Acm.Org


From michele.simionato at gmail.com  Wed May  6 11:14:16 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Wed, 6 May 2009 08:14:16 -0700 (PDT)
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
	<mailman.5031.1241420740.11746.python-list@python.org>
	<81f82d8c-80fa-4ba0-a402-3a8b5757a967@s16g2000vbp.googlegroups.com>
Message-ID: <404c22b7-041f-4c85-9c7d-11e9945d0758@v4g2000vba.googlegroups.com>

On May 5, 10:37?pm, Deep_Feelings <doctore... at gmail.com> wrote:
> that is good ,thank you
>
> anyone did that ? learning from python docs straight away ?

A lot of people did. I did, but I usually prefer reading user manuals
over books, and YMMV.


From keshet1 at umbc.edu  Wed May  6 11:31:58 2009
From: keshet1 at umbc.edu (Ben Keshet)
Date: Wed, 06 May 2009 11:31:58 -0400
Subject: Pyhton script to call another program
Message-ID: <4A01AD6E.4010807@umbc.edu>

Hi,

I am trying to write a simple python script to manipulate files and call 
other programs.  I have a program installed (rocs) which I run using 
cygwin on my XP (but is not in python).  Can I run the pyhton script and 
then call the other program in the same script?

For example:
Python Code  # this line opens a file
Python Code  # this line splits the file into 4 different files
rocs  # this line calls the program 'rocs' to run on the newly formed files
Python Code # this line renames rocs output files and saves them in the 
right place.

Otherwise, I would have to write two scripts (before and after 'rocs'), 
and run the 3 scripts/programs separately. 

I am relatively new to python and don't know a lot about cygwin.  Please 
remember that if you try to answer me :) Thanks!


From Scott.Daniels at Acm.Org  Wed May  6 11:35:51 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 06 May 2009 08:35:51 -0700
Subject: Separate Windows versions of Python
In-Reply-To: <52b28a62-d0de-4d26-b2bd-dc4bf2affb71@p4g2000vba.googlegroups.com>
References: <52b28a62-d0de-4d26-b2bd-dc4bf2affb71@p4g2000vba.googlegroups.com>
Message-ID: <1fWdnY3Iu8y0MJzXnZ2dnUVZ_uqdnZ2d@pdx.net>

OldGrantonian wrote:
> I use Windows Vista Home Premium. I have Python 2.6 currently
> installed. I'm not a techy.
> 
> I want to use "virtualenv". When I try to install the latest version
> of virtualenv for Windows, I get the message that Python 2.5 is not
> found.
> 
> How do I install Python 2.5 (or anything else except 2.6) so that I
> use the correct version of Python at the correct time.
> 
> For example, do I need to edit the "path" variable each time that I
> want to change versions from 2.5 to 2.6?

On windows, major versions (..., 2.5, 2.6, 2.7, ...., 3.0, 3.1,  ...)
can coexist quite successfully.  Find and run an installer for the
latest version  of 2.5 (2.5.4, I believe) on the Python download page.
That will make 2.5 your default Python.  To switch the easiest way
(for you) is uninstall the version of python you want to be the
default, then install it again (making it the last one installed).
This suggests keeping installer binaries for all version you are
using.  Note that the this uninstall-reinstall should not affect
you loaded Python packages that you have installed separately.
To simply run a python program with a different python (but not
change the default), open a command window (run program / cmd),
sometimes called a "terminal window" and use command:
     C:\> C:\Python24\python program.py  # command line version
or
     C:\> C:\Python24\pythonw program.pyw  # gui verson
You can also change shortcuts to refer to specific Python versions.

Of course, the different Python versions should also be available
on your start menu.

However, Starting with Python 2.6, if you want user-specific
installation, you can also create and put things in (for example),
     C:\Documents and Settings\USER\Application Data\
                             Python\Python26\site-packages
where you replace USER with the user name in question.

If you are not planning to do a lot of switching, that might be
enough for you.  The base directory is also called %APPDATA% on
a command line or via os.path.expandvars.  Once you have created
this site-packages directory, Python 2.6 and later will use it to
find .pth, .py, .pyw, and .pyd files (as well as .pyc and .pyo
files).  You may find changing your personal site-packages directory
(and/or a .pth therein that you manipulate) will address the issues
that you are planning to solve with virtualenv.

Sorry for the long-winded answer.
--Scott David Daniels
Scott.Daniels at Acm.Org


in addition to the common site-packages directory on


From deets at nospam.web.de  Wed May  6 11:57:46 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 06 May 2009 17:57:46 +0200
Subject: Pyhton script to call another program
References: <mailman.5152.1241624526.11746.python-list@python.org>
Message-ID: <76dq8pF1bisltU1@mid.uni-berlin.de>

Ben Keshet wrote:

> Hi,
> 
> I am trying to write a simple python script to manipulate files and call
> other programs.  I have a program installed (rocs) which I run using
> cygwin on my XP (but is not in python).  Can I run the pyhton script and
> then call the other program in the same script?
> 
> For example:
> Python Code  # this line opens a file
> Python Code  # this line splits the file into 4 different files
> rocs  # this line calls the program 'rocs' to run on the newly formed
> files Python Code # this line renames rocs output files and saves them in
> the right place.
> 
> Otherwise, I would have to write two scripts (before and after 'rocs'),
> and run the 3 scripts/programs separately.
> 
> I am relatively new to python and don't know a lot about cygwin.  Please
> remember that if you try to answer me :) Thanks!

Check out the module "subprocess" in the standard library documentation.
This will allow you to call other programs.

Diez


From Florian.Wollenschein at FernUni-Hagen.de  Wed May  6 12:06:17 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Wed, 06 May 2009 18:06:17 +0200
Subject: thc v0.3 - txt to html converter - better code?
In-Reply-To: <gtrin4$7h5$1@south.jnrs.ja.net>
References: <gtppqc$7v1$1@news-cedar.fernuni-hagen.de>
	<4a008996$0$31862$9b4e6d93@newsspool3.arcor-online.net>
	<gtrin4$7h5$1@south.jnrs.ja.net>
Message-ID: <gtschq$a1p$1@news-cedar.fernuni-hagen.de>

Richard Brodie wrote:
> "Stefan Behnel" <stefan_ml at behnel.de> wrote in message 
> news:4a008996$0$31862$9b4e6d93 at newsspool3.arcor-online.net...
> 
>>    language_map = {'English': 'EN', 'Deutsch': 'DE'}
>>    strict_or_transitional = {True: 'Transitional', False: 'Strict'}
>>
>>    # this will raise a KeyError for unknown languages
>>    language = language_map[ self.cmboBoxLang.currentText() ]
>>
>>    # this assumes that isChecked() returns True or False
>>    spec = strict_or_transitional[self.rdioBtnTransitional.isChecked()]
>>
>>    doctype = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 %s/%s">\n' % (
>>        spec, language)
> 
> Incidentally, the language in an HTML DOCTYPE refers to the language of the DTD, not
> the document. It's never correct to use //DE in an HTML page, unless you have a custom
> (German) DTD. So the code can be improved further by cutting that part out.
> 
>     strict_or_transitional = {True: 'Transitional', False: 'Strict'}
> 
>     # this assumes that isChecked() returns True or False
>     spec = strict_or_transitional[self.rdioBtnTransitional.isChecked()]
> 
>     doctype = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 %s//EN">\n' % spec
> 
> 


Yes, that's true. I missed that. Thanks for the information.
And many thanks to Stefan.


From mauriceling at gmail.com  Wed May  6 12:12:35 2009
From: mauriceling at gmail.com (Maurice Ling)
Date: Wed, 6 May 2009 09:12:35 -0700 (PDT)
Subject: Completion of The Python Papers Volume 4 Issue 1
References: <8b10356e-1a40-424b-b288-bbc3fa6f7d39@x29g2000prf.googlegroups.com>
Message-ID: <f77b7030-8fa7-454d-8926-e5f9b88b21cb@g31g2000pra.googlegroups.com>

My apologies.

It should be Volume 4 Issue 1 instead of Issue 4 Volume 1.

Thank you Scott for pointing this out.

Regards
Maurice

On May 6, 10:08 pm, "mauricel... at acm.org" <mauricel... at gmail.com>
wrote:
> Welcome to Issue 4 Volume 1 of The Python Papers. This marks our 4th
> year in business. It is my pleasure to announce 4 improvements made to
> The Python Papers Anthology.
>
> Firstly, we had created a class of editorial members in our team ? the
> Editorial Reviewers (ER). This is in addition to the existing Editors-
> in-Chief (EIC) and Associate Editors (AE). In the words of our revised
> editorial policy, ?ER is a tier of editors deemed to have in-depth
> expertise knowledge in specialized areas. As members of the editorial
> board, ERs are accorded editorial status but are generally not
> involved in the strategic and routine operations of the periodicals
> although their
> expert opinions may be sought at the discretion of EIC.? To this
> aspect, we are glad to have Jacob Kaplan-Moss (President, Django
> Software Foundation; Partner, Revolution Systems, LLC; Co-BDFL,
> Django) as our first ER. Welcome aboard.
>
> Secondly, we had adopted a fast publication scheme. In the past,
> accepted manuscripts will only be published on the release date in the
> month of April, August and December each year. With the use of Open
> Journal System, we are able to publish manuscripts as they are being
> accepted. This means that the release date in the month of April,
> August and December is now effectively our closing date for the issue.
> For example, manuscripts accepted after April 2009 will be routed to
> immediate publication in Volume 4 Issue 2. This is to being
> information faster to our readers, rather than waiting for a few
> months.
>
> Thirdly, we announce a set of manuscript templates for our authors and
> contributors for their manuscript preparation. As such, we had
> revamped our website (http://www.pythonpapers.org) to reflect these
> changes.
>
> Lastly, we are glad to announce the launch of our 2nd publication
> under The Python Papers Anthology ? The Python Papers Source Codes
> (ISSN 1836-621X). TPPSC, for short, is a collection of software and
> source codes, usually associated with papers published in The Python
> Papers and The Python Papers Monograph. These codes are refereed for
> originality, accuracy, completeness, and lasting value. TPPSC will
> act as a developers codebook of high-quality, peer-reviewed codes.
> TPPSC is an annual publication using the same fast publication scheme.
>
> We thank all our readers and contributors for their continued support.
>
> Happy reading.
>
> Maurice Ling
> Co-EIC, TPPA



From vinay_sajip at yahoo.co.uk  Wed May  6 12:14:41 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Wed, 6 May 2009 09:14:41 -0700 (PDT)
Subject: pyinstaller and logging
References: <f77c51e8-9b7e-44cc-b7bb-1d7c723b7764@o20g2000vbh.googlegroups.com>
Message-ID: <93736f55-0177-4be7-a333-8eb850d4c321@x6g2000vbg.googlegroups.com>

On May 6, 2:41 pm, Mike <tornadoma... at gmx.net> wrote:
> Pyinstaller seems to have a problem withlogging...
>
>  I installed pyinstaller 1.3 - using it together with Python 2.6. I
> used pyinstaller for a small project, the created .exe worked fine.
> After some additional changes to my project I got strange run time
> errors when running the .exe (but no problems when running the .py
> file directly with the python interpreter). I stripped down my program
> and tracked the problem down to the first log message being written.
>
> So this is a stripped down version of the python script:
>
> importlogginglogging.basicConfig(level=logging.INFO,
>                     format='%(asctime)-15s %(levelname)-8s %(message)
> s',
>                     datefmt='%Y-%m-%d %H:%M:%S',
>                     filename="test1.log",
>                     filemode='w')
> print "written via print"logging.info("written vialogging")
>
> when I start this from the python shell I am getting
>            IDLE 2.6.2      ==== No Subprocess ====
>            >>>
>            written via print
>            >>>
> and test1.log contains
>            2009-05-05 19:39:52 INFO     written vialogging
> as expected.
>
> When I start test1.exe I am getting
>
> written via print
> Traceback (most recent call last):
>   File "<string>", line 8, in <module>
>   File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> \v0r0m2\buildtest1\out1.pyz/logging", line 1451, in info
>   File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> \v0r0m2\buildtest1\out1.pyz/logging", line 1030, in info
>   File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> \v0r0m2\buildtest1\out1.pyz/logging", line 1142, in _log
>   File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> \v0r0m2\buildtest1\out1.pyz/logging", line 1117, in makeRecord
>   File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> \v0r0m2\buildtest1\out1.pyz/logging", line 272, in __init__
>   File "C:\Programme\pyinstaller-1.3\iu.py", line 312, in importHook
>     mod = _self_doimport(nm, ctx, fqname)
>   File "C:\Programme\pyinstaller-1.3\iu.py", line 398, in doimport
>     exec co in mod.__dict__
>   File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> \v0r0m2\buildtest1\out1.pyz/multiprocessing", line 83, in <module>
>   File "C:\Programme\pyinstaller-1.3\iu.py", line 312, in importHook
>     mod = _self_doimport(nm, ctx, fqname)
>   File "C:\Programme\pyinstaller-1.3\iu.py", line 382, in doimport
>     mod = director.getmod(nm)
>   File "C:\Programme\pyinstaller-1.3\iu.py", line 215, in getmod
>     mod = owner.getmod(nm)
>   File "C:\Programme\pyinstaller-1.3\iu.py", line 77, in getmod
>     mod = imp.load_module(nm, fp, attempt, (ext, mode, typ))
> TypeError: importHook() takes at most 5 arguments (6 given)
>
> What am I doing wrong?

Apparently, PyInstaller only supports versions of Python between 1.5
and 2.4:

http://www.pyinstaller.org/#Requirements

So, you are using it in an unsupported environment. I see you've cross-
posted this to the PyInstaller mailing list:

http://groups.google.com/group/PyInstaller

I hope someone on that list can help. An additional bit of information
from your traceback is that line 272 in 2.6's logging/__init__.py is
one that says "from multiprocessing import current_process". As this
line is only executed if logging.logMultiProcessing is set, you may be
able to work around by setting logging.logMultiProcessing to False in
your app initialisation. Of course, this might just result in a
failure somewhere else...

Regards,

Vinay Sajip




From OldGrantonian at googlemail.com  Wed May  6 12:24:56 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Wed, 6 May 2009 09:24:56 -0700 (PDT)
Subject: Separate Windows versions of Python
References: <52b28a62-d0de-4d26-b2bd-dc4bf2affb71@p4g2000vba.googlegroups.com>
	<1fWdnY3Iu8y0MJzXnZ2dnUVZ_uqdnZ2d@pdx.net>
Message-ID: <a7f1be3a-dcd0-4fe7-bad1-ff801b6ff142@e20g2000vbc.googlegroups.com>

Many thanks for the very detailed answer :)

I will go ahead right now and implement all your suggestions.




On May 6, 4:35?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> OldGrantonian wrote:
> > I use Windows Vista Home Premium. I have Python 2.6 currently
> > installed. I'm not a techy.
>
> > I want to use "virtualenv". When I try to install the latest version
> > of virtualenv for Windows, I get the message that Python 2.5 is not
> > found.
>
> > How do I install Python 2.5 (or anything else except 2.6) so that I
> > use the correct version of Python at the correct time.
>
> > For example, do I need to edit the "path" variable each time that I
> > want to change versions from 2.5 to 2.6?
>
> On windows, major versions (..., 2.5, 2.6, 2.7, ...., 3.0, 3.1, ?...)
> can coexist quite successfully. ?Find and run an installer for the
> latest version ?of 2.5 (2.5.4, I believe) on the Python download page.
> That will make 2.5 your default Python. ?To switch the easiest way
> (for you) is uninstall the version of python you want to be the
> default, then install it again (making it the last one installed).
> This suggests keeping installer binaries for all version you are
> using. ?Note that the this uninstall-reinstall should not affect
> you loaded Python packages that you have installed separately.
> To simply run a python program with a different python (but not
> change the default), open a command window (run program / cmd),
> sometimes called a "terminal window" and use command:
> ? ? ?C:\> C:\Python24\python program.py ?# command line version
> or
> ? ? ?C:\> C:\Python24\pythonw program.pyw ?# gui verson
> You can also change shortcuts to refer to specific Python versions.
>
> Of course, the different Python versions should also be available
> on your start menu.
>
> However, Starting with Python 2.6, if you want user-specific
> installation, you can also create and put things in (for example),
> ? ? ?C:\Documents and Settings\USER\Application Data\
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Python\Python26\site-packages
> where you replace USER with the user name in question.
>
> If you are not planning to do a lot of switching, that might be
> enough for you. ?The base directory is also called %APPDATA% on
> a command line or via os.path.expandvars. ?Once you have created
> this site-packages directory, Python 2.6 and later will use it to
> find .pth, .py, .pyw, and .pyd files (as well as .pyc and .pyo
> files). ?You may find changing your personal site-packages directory
> (and/or a .pth therein that you manipulate) will address the issues
> that you are planning to solve with virtualenv.
>
> Sorry for the long-winded answer.
> --Scott David Daniels
> Scott.Dani... at Acm.Org
>
> in addition to the common site-packages directory on



From damienlmoore at gmail.com  Wed May  6 12:51:57 2009
From: damienlmoore at gmail.com (spillz)
Date: Wed, 6 May 2009 09:51:57 -0700 (PDT)
Subject: Problem with case insensitive volumes
References: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
	<mailman.5088.1241498014.11746.python-list@python.org>
	<26c57bf5-5ad2-4838-8097-c8d51cf1ccae@n8g2000vbb.googlegroups.com>
	<b4adnUex6-RR2J3XnZ2dnUVZ_t2dnZ2d@pdx.net>
	<b5d10d01-0f56-4df9-9e4e-99a93a0e0a0f@s31g2000vbp.googlegroups.com>
	<mailman.5131.1241576707.11746.python-list@python.org>
Message-ID: <7761aa9c-2d0f-4429-9b02-766b315c0c80@o30g2000vbc.googlegroups.com>

On May 5, 10:24?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> I use this function on Windows to obtain the true case name of a file:

very nice. I think the python bindings to the gnome GIO library
*might* provide what I need on the linux side.


From tornadomaker at gmx.net  Wed May  6 13:22:32 2009
From: tornadomaker at gmx.net (Mike)
Date: Wed, 6 May 2009 10:22:32 -0700 (PDT)
Subject: pyinstaller and logging
References: <f77c51e8-9b7e-44cc-b7bb-1d7c723b7764@o20g2000vbh.googlegroups.com>
	<93736f55-0177-4be7-a333-8eb850d4c321@x6g2000vbg.googlegroups.com>
Message-ID: <b6c04e60-3692-4ee3-a438-8b5563caccc9@r34g2000vbi.googlegroups.com>

On 6 Mai, 18:14, Vinay Sajip <vinay_sa... at yahoo.co.uk> wrote:
> On May 6, 2:41 pm, Mike <tornadoma... at gmx.net> wrote:
>
>
>
> > Pyinstaller seems to have a problem withlogging...
>
> > ?I installed pyinstaller 1.3 - using it together with Python 2.6. I
> > used pyinstaller for a small project, the created .exe worked fine.
> > After some additional changes to my project I got strange run time
> > errors when running the .exe (but no problems when running the .py
> > file directly with the python interpreter). I stripped down my program
> > and tracked the problem down to the first log message being written.
>
> > So this is a stripped down version of the python script:
>
> > importlogginglogging.basicConfig(level=logging.INFO,
> > ? ? ? ? ? ? ? ? ? ? format='%(asctime)-15s %(levelname)-8s %(message)
> > s',
> > ? ? ? ? ? ? ? ? ? ? datefmt='%Y-%m-%d %H:%M:%S',
> > ? ? ? ? ? ? ? ? ? ? filename="test1.log",
> > ? ? ? ? ? ? ? ? ? ? filemode='w')
> > print "written via print"logging.info("written vialogging")
>
> > when I start this from the python shell I am getting
> > ? ? ? ? ? ?IDLE 2.6.2 ? ? ?==== No Subprocess ====
>
> > ? ? ? ? ? ?written via print
>
> > and test1.log contains
> > ? ? ? ? ? ?2009-05-05 19:39:52 INFO ? ? written vialogging
> > as expected.
>
> > When I start test1.exe I am getting
>
> > written via print
> > Traceback (most recent call last):
> > ? File "<string>", line 8, in <module>
> > ? File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> > \v0r0m2\buildtest1\out1.pyz/logging", line 1451, in info
> > ? File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> > \v0r0m2\buildtest1\out1.pyz/logging", line 1030, in info
> > ? File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> > \v0r0m2\buildtest1\out1.pyz/logging", line 1142, in _log
> > ? File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> > \v0r0m2\buildtest1\out1.pyz/logging", line 1117, in makeRecord
> > ? File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> > \v0r0m2\buildtest1\out1.pyz/logging", line 272, in __init__
> > ? File "C:\Programme\pyinstaller-1.3\iu.py", line 312, in importHook
> > ? ? mod = _self_doimport(nm, ctx, fqname)
> > ? File "C:\Programme\pyinstaller-1.3\iu.py", line 398, in doimport
> > ? ? exec co in mod.__dict__
> > ? File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> > \v0r0m2\buildtest1\out1.pyz/multiprocessing", line 83, in <module>
> > ? File "C:\Programme\pyinstaller-1.3\iu.py", line 312, in importHook
> > ? ? mod = _self_doimport(nm, ctx, fqname)
> > ? File "C:\Programme\pyinstaller-1.3\iu.py", line 382, in doimport
> > ? ? mod = director.getmod(nm)
> > ? File "C:\Programme\pyinstaller-1.3\iu.py", line 215, in getmod
> > ? ? mod = owner.getmod(nm)
> > ? File "C:\Programme\pyinstaller-1.3\iu.py", line 77, in getmod
> > ? ? mod = imp.load_module(nm, fp, attempt, (ext, mode, typ))
> > TypeError: importHook() takes at most 5 arguments (6 given)
>
> > What am I doing wrong?
>
> Apparently, PyInstaller only supports versions of Python between 1.5
> and 2.4:
>
> http://www.pyinstaller.org/#Requirements
>
> So, you are using it in an unsupported environment. I see you've cross-
> posted this to the PyInstaller mailing list:
>
> http://groups.google.com/group/PyInstaller
>
> I hope someone on that list can help. An additional bit of information
> from your traceback is that line 272 in 2.6's logging/__init__.py is
> one that says "from multiprocessing import current_process". As this
> line is only executed if logging.logMultiProcessing is set, you may be
> able to work around by setting logging.logMultiProcessing to False in
> your app initialisation. Of course, this might just result in a
> failure somewhere else...
>
> Regards,
>
> Vinay Sajip

Shame on me - I somehow skipped the requirement from pyinstaller just
supporting python between 1.5 and 2.4 ... - thanks for your help - I
was aware it is not supporting python 3.0 (I searched a tool
creating .exes for Python 3.0 in the first place). I googled around
and found some recommendations for pyinstaller, but with the
restriction "it is just supporting the latest version of 2.x but not
3.0 of python". I never double checked on the formal requirements on
the pyinstaller site... .

Your hint regarding logging.logMultiProcessing=False did not change
the problem. As I do not want to switch to python 2.4 I will have to
look for something else. I tried py2exe today, which seems to work
fine for my project (and officially supports python 2.6 ;-) ) - it is
able to create an exe file within a dist directory, but not a single
executable like pyinstaller is doing it. But this is fine enough for
me just now.


From norseman at hughes.net  Wed May  6 13:47:21 2009
From: norseman at hughes.net (norseman)
Date: Wed, 06 May 2009 10:47:21 -0700
Subject: Pyhton script to call another program
In-Reply-To: <4A01AD6E.4010807@umbc.edu>
References: <4A01AD6E.4010807@umbc.edu>
Message-ID: <4A01CD29.3010507@hughes.net>

Ben Keshet wrote:
> Hi,
> 
> I am trying to write a simple python script to manipulate files and call 
> other programs.  I have a program installed (rocs) which I run using 
> cygwin on my XP (but is not in python).  Can I run the pyhton script and 
> then call the other program in the same script?
> 
> For example:
> Python Code  # this line opens a file
> Python Code  # this line splits the file into 4 different files
> rocs  # this line calls the program 'rocs' to run on the newly formed files
> Python Code # this line renames rocs output files and saves them in the 
> right place.
> 
> Otherwise, I would have to write two scripts (before and after 'rocs'), 
> and run the 3 scripts/programs separately.
> I am relatively new to python and don't know a lot about cygwin.  Please 
> remember that if you try to answer me :) Thanks!
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 
==========================================
If you don't like a lot of typing that obscures the process,
take a look at the spawn family.


  processPython 2.5.2 (r252:60911, Mar  4 2008, 10:40:55)
[GCC 3.3.6] on linux2
Type "help", "copyright", "credits" or "license" for more information.

 >>> import os
 >>> AbWd = os.spawnlp( os.P_WAIT,"abiword","abiword","")

The P_WAIT stops python until the program (abiword in this case) 
completes.  The "" at the end are for tokens to be given to the program 
and yes - contrary to manual, the program MUST be there TWICE (complete 
with any path needed).

for windows this works:
(can't cut and paste from a dos box!###%*&!!!)

Python 2.5.1 ... on win32
 >>> import os
 >>> result = os.spawnl( os.P_WAIT, "d:\\winmcad\\mcad","")

Runs the program mcad. Returns to python when mcad exits.


Today: 20090506
Python ver as snippets show.
OS is Linux Slackware 10.2
OS is Windows XP Pro

Steve


From Florian.Wollenschein at FernUni-Hagen.de  Wed May  6 13:48:11 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Wed, 06 May 2009 19:48:11 +0200
Subject: hex(dummy)[2:] - issue...
Message-ID: <gtsigt$31m$1@news-cedar.fernuni-hagen.de>

Hi there,

I need some advice :-)
I'm using hex(dummy)[2:] to represent a color in hexadecimal format for 
the bgcolor in an html file. dummy is the color value in RGB of course...

Now, if there's an R, G or B value of zero, this command only prints one 
single 0 instead of two. What's wrong with the code?

Thanks,
Listick
http://www.listick.org


From 71david at libero.it  Wed May  6 13:49:57 2009
From: 71david at libero.it (David)
Date: Wed, 6 May 2009 19:49:57 +0200
Subject: Pyhton script to call another program
References: <mailman.5152.1241624526.11746.python-list@python.org>
Message-ID: <1crn8u0lutm6h$.1qt709r9zm842.dlg@40tude.net>

Il Wed, 06 May 2009 11:31:58 -0400, Ben Keshet ha scritto:

> Hi,
> 
> I am trying to write a simple python script to manipulate files and call 
> other programs.  I have a program installed (rocs) which I run using 
> cygwin on my XP (but is not in python).  Can I run the pyhton script and 
> then call the other program in the same script?

Look at the os.system function call.

D.


From python.list at tim.thechases.com  Wed May  6 13:54:13 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 06 May 2009 12:54:13 -0500
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another
	program)
In-Reply-To: <4A01CD29.3010507@hughes.net>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
Message-ID: <4A01CEC5.4090008@tim.thechases.com>

> for windows this works:
> (can't cut and paste from a dos box!###%*&!!!)

Depending on how it was spawned, you can either right-click in 
the window and choose Mark/Paste (when marking, use <enter> to 
terminate the selection; and selections are blockwise rectangular 
rather than linewise or characterwise).  Alternatively, if you 
click on the system menu (the icon in the title-bar with 
resize/minimize/maximize/close/help), there should be an Edit 
submenu with the same options within.

A pain, but at least feasible.

HTH,

-tkc






From norseman at hughes.net  Wed May  6 14:02:06 2009
From: norseman at hughes.net (norseman)
Date: Wed, 06 May 2009 11:02:06 -0700
Subject: Which one is best Python or Java for developing GUI applications?
In-Reply-To: <aee48b3c0905060146t3ada829eucfc0d79cc8be9c67@mail.gmail.com>
References: <793408.86105.qm@web7903.mail.in.yahoo.com>	<gtreu8$f64$1@ger.gmane.org>
	<aee48b3c0905060146t3ada829eucfc0d79cc8be9c67@mail.gmail.com>
Message-ID: <4A01D09E.3020304@hughes.net>

Tim Rowe wrote:
> 2009/5/6 Dennis Lee Bieber <wlfraed at ix.netcom.com>:
> 
>> (the "near" is because I feel Ada is
>> stricter than any other language)
> 
> Try SPARK -- it's Ada based, but /much/ stricter. It's just right for
> some really critical stuff, but is no sort of an answer to "Which one
> is best Python or Java for developing GUI"!
> 
==========================

"...really critical stuff..."    Then the only real choice is assembly!

And correct - that's nothing to do with Python vs Java.

Back to the question:
Python has one advantage that has not been mentioned.  It allows the 
programmer to start with prior coding practices and 'ease' into OOP 
because Python happily allows a mix of traditional and OOP coding.

Beyond that - "There is no accounting for taste."  You are on your own.
You see - with daughter #1 I need pencil and paper to explain things.
           with daughter #2 I sit on my hands and narrate correctly the
             first time.
Many things have no "one is better" option beyond individual quirks. Or 
shall we say preferences?  The old - "This works for me" is right one.

Steve


From wzab01 at gmail.com  Wed May  6 14:03:57 2009
From: wzab01 at gmail.com (wzab)
Date: Wed, 6 May 2009 11:03:57 -0700 (PDT)
Subject: IIR filter conversion routines for Python?
Message-ID: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>

Hi,
I'm looking for procedures converting the IIR filters into cascade and/
or parallel forms. Something like dir2cas.m or dir2par.m known in the
Matlab/Octave world.
Unfortunately SciPy does not contain such functions.
If they are not available, I would be grateful for any hints helping
me to implement them myself.
--
TIA, BR,
WZab


From Shawn at Milochik.com  Wed May  6 14:12:53 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 6 May 2009 14:12:53 -0400
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another 
	program)
In-Reply-To: <4A01CEC5.4090008@tim.thechases.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<4A01CEC5.4090008@tim.thechases.com>
Message-ID: <2dc0c81b0905061112l32426cb8rafa3a86dca12810d@mail.gmail.com>

On Wed, May 6, 2009 at 1:54 PM, Tim Chase <python.list at tim.thechases.com> wrote:
>> for windows this works:
>> (can't cut and paste from a dos box!###%*&!!!)
>
> Depending on how it was spawned, you can either right-click in the window
> and choose Mark/Paste (when marking, use <enter> to terminate the selection;
> and selections are blockwise rectangular rather than linewise or
> characterwise). ?Alternatively, if you click on the system menu (the icon in
> the title-bar with resize/minimize/maximize/close/help), there should be an
> Edit submenu with the same options within.
>
> A pain, but at least feasible.
<snip>

I know I'm coming to the conversation late, but here's what I do*:

1. Use Cygwin. (http://www.cygwin.com/)
2. Use PuttyCYG (http://code.google.com/p/puttycyg/)

That way, you can basically use PuTTY to shell into your Windows box.

Note: If you are familiar with the Linux command line, you will be in
love with this solution. If you're a Windows-only type, then be
forewarned that doing this will require you to type Unix/Linux
commands (for the most part) instead of DOS commands.

*Disclaimer: I use a Mac and Linux. This is my workaround when forced
to use Windows. Your environment preferences may vary.


From python.list at tim.thechases.com  Wed May  6 14:13:23 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 06 May 2009 13:13:23 -0500
Subject: hex(dummy)[2:] - issue...
In-Reply-To: <gtsigt$31m$1@news-cedar.fernuni-hagen.de>
References: <gtsigt$31m$1@news-cedar.fernuni-hagen.de>
Message-ID: <4A01D343.8000800@tim.thechases.com>

> I need some advice :-)
> I'm using hex(dummy)[2:] to represent a color in hexadecimal format for 
> the bgcolor in an html file. dummy is the color value in RGB of course...
> 
> Now, if there's an R, G or B value of zero, this command only prints one 
> single 0 instead of two. What's wrong with the code?

You can try

  PLACES = 2 # 6?
  hex(dummy)[2:].zfill(PLACES)

Alternatively, you can output decimal numbers in HTML/CSS with

   rgb(r, g, b)

such as

   style="rgb(255,0,0)"

However, I recommend doing this via CSS unless you have a strong 
reason to sully your HTML with style information.

-tkc









From stermen975 at gmail.com  Wed May  6 14:27:18 2009
From: stermen975 at gmail.com (stermen)
Date: Wed, 06 May 2009 18:27:18 GMT
Subject: Iphone Going 3G!
In-Reply-To: <49081152_1@news.tm.net.my>
References: <486cab43$1_2@news.tm.net.my> <20fqou.nq0.19.1@news.alt.net>
	<48df149c_1@news.tm.net.my> <49081152_1@news.tm.net.my>
Message-ID: <aEkMl.315069$FR.617400@twister1.libero.it>

Notebooks stocks priced

http://rover.ebay.com/rover/1/711-53200-19255-0/1?type=3&campid=5336229480&toolid=10001&customid=&ext=notebook&satitle=notebook











"Shafiq" <JGK_7733 at yahoo.com> ha scritto nel messaggio 
news:49081152_1 at news.tm.net.my...
> apalah kau ni tak belajar ke bahasa menunjukkan bangsa
> "news.tm.net.my" <kutukutu at maha.com> wrote in message 
> news:48df149c_1 at news.tm.net.my...
>> relic wrote:
>>> fizzi wrote:
>>>> For the Iphone lovers out there,
>>>
>>> Wrong group. No weirdos here.
>> testtt
>
> 



From google at mrabarnett.plus.com  Wed May  6 14:28:02 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 06 May 2009 19:28:02 +0100
Subject: hex(dummy)[2:] - issue...
In-Reply-To: <gtsigt$31m$1@news-cedar.fernuni-hagen.de>
References: <gtsigt$31m$1@news-cedar.fernuni-hagen.de>
Message-ID: <4A01D6B2.8060805@mrabarnett.plus.com>

Florian Wollenschein wrote:
> Hi there,
> 
> I need some advice :-)
> I'm using hex(dummy)[2:] to represent a color in hexadecimal format for 
> the bgcolor in an html file. dummy is the color value in RGB of course...
> 
> Now, if there's an R, G or B value of zero, this command only prints one 
> single 0 instead of two. What's wrong with the code?
> 
hex() returns '0x' followed by no more digits than are necessary:

 >>> hex(0xFF)
'0xff'
 >>> hex(0xF)
'0xf'

Try "%02X" instead (it'll pad with leading zeros up to a width of 2):

 >>> "%02X" % 0xFF
'FF'
 >>> "%02X" % 0xF
'0F'



From iainemsley at googlemail.com  Wed May  6 14:32:28 2009
From: iainemsley at googlemail.com (iainemsley)
Date: Wed, 6 May 2009 11:32:28 -0700 (PDT)
Subject: Parsing text
Message-ID: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>

Hi,
I'm trying to write a fairly basic text parser to split up scenes and
acts in plays to put them into XML. I've managed to get the text split
into the blocks of scenes and acts and returned correctly but I'm
trying to refine this and get the relevant scene number when the split
is made but I keep getting an NoneType error trying to read the block
inside the for loop and nothing is being returned. I'd be grateful for
some suggestions as to how to get this working.

for scene in text.split('Scene'):
    num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)
    textNum = num.match(scene)
    if textNum:
        print textNum
    else:
        print "No scene number"
    m = '<div type="scene>'
    m += scene
    m += '<\div>'
    print m

Thanks, Iain


From invalid at invalid  Wed May  6 14:39:47 2009
From: invalid at invalid (Grant Edwards)
Date: Wed, 06 May 2009 13:39:47 -0500
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another
	program)
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<4A01CEC5.4090008@tim.thechases.com>
	<mailman.5155.1241633576.11746.python-list@python.org>
Message-ID: <-ZOdnagfEPjuRJzXnZ2dnUVZ_omdnZ2d@posted.visi>

On 2009-05-06, Shawn Milochik <Shawn at Milochik.com> wrote:

> I know I'm coming to the conversation late, but here's what I do*:
>
> 1. Use Cygwin. (http://www.cygwin.com/)
> 2. Use PuttyCYG (http://code.google.com/p/puttycyg/)
>
> That way, you can basically use PuTTY to shell into your
> Windows box.

Better yet, set up sshd in your Cygwin install, and then use
whatever terminal you normally use on your Linux/MacOS box to
ssh into the Cygwin box.  When run that way, windows is almost
usable...

-- 
Grant Edwards                   grante             Yow! Oh, I get it!!
                                  at               "The BEACH goes on", huh,
                               visi.com            SONNY??


From Shawn at Milochik.com  Wed May  6 14:47:24 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 6 May 2009 14:47:24 -0400
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another 
	program)
In-Reply-To: <-ZOdnagfEPjuRJzXnZ2dnUVZ_omdnZ2d@posted.visi>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<4A01CEC5.4090008@tim.thechases.com>
	<mailman.5155.1241633576.11746.python-list@python.org>
	<-ZOdnagfEPjuRJzXnZ2dnUVZ_omdnZ2d@posted.visi>
Message-ID: <2dc0c81b0905061147v55027b08t3a5fafb0ebea81f9@mail.gmail.com>

On Wed, May 6, 2009 at 2:39 PM, Grant Edwards <invalid at invalid> wrote:
> On 2009-05-06, Shawn Milochik <Shawn at Milochik.com> wrote:
>
>> I know I'm coming to the conversation late, but here's what I do*:
>>
>> 1. Use Cygwin. (http://www.cygwin.com/)
>> 2. Use PuttyCYG (http://code.google.com/p/puttycyg/)
>>
>> That way, you can basically use PuTTY to shell into your
>> Windows box.
>
> Better yet, set up sshd in your Cygwin install, and then use
> whatever terminal you normally use on your Linux/MacOS box to
> ssh into the Cygwin box. ?When run that way, windows is almost
> usable...
>
> --
> Grant Edwards

<snip>

True, but when I'm using Cygwin, that means I'm at work and don't have
a non-MS OS available. Of course I can open an ssh session to my home
machine for sanity (or kicking off a torrent download at home), but I
don't have a *nix-based OS at the day job. Lanching DSL embedded to
use the terminal seems a bit much. ^_^

Shawn


From Shawn at Milochik.com  Wed May  6 14:49:49 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 6 May 2009 14:49:49 -0400
Subject: Parsing text
In-Reply-To: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <2dc0c81b0905061149p4e2f4f07y7ad6168c491f6244@mail.gmail.com>

On Wed, May 6, 2009 at 2:32 PM, iainemsley <iainemsley at googlemail.com> wrote:
> Hi,
> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.
>
> for scene in text.split('Scene'):
> ? ?num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)
> ? ?textNum = num.match(scene)
> ? ?if textNum:
> ? ? ? ?print textNum
> ? ?else:
> ? ? ? ?print "No scene number"
> ? ?m = '<div type="scene>'
> ? ?m += scene
> ? ?m += '<\div>'
> ? ?print m
>
> Thanks, Iain


Can you provide some sample input so we can recreate the problem?

Also, consider something like this instead of the concatenation:

m = '<div type="scene>%s</div>' % (scene,)


From Scott.Daniels at Acm.Org  Wed May  6 14:50:39 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 06 May 2009 11:50:39 -0700
Subject: Parsing text
In-Reply-To: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <UumdnU_wfaNMR5zXnZ2dnUVZ_v2dnZ2d@pdx.net>

iainemsley wrote:
> Hi,
> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.
> 
> ...(some code)...

You'll get a lot better help if you:
     (1) Include enough code to run and encounter the problem.
         Edit this down to something small (in the process,
         you may discover what was wrong).
     (2) Include actual sample data demonstrating the problem.
and (3) Cut and paste the _actual_ error message and traceback
         from your output when running the sample code with the
         sample data.
For extra points, identify the Python version you are using.

--Scott David Daniels
Scott.Daniels at Acm.Org


From google at mrabarnett.plus.com  Wed May  6 14:55:21 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 06 May 2009 19:55:21 +0100
Subject: Parsing text
In-Reply-To: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <4A01DD19.3020106@mrabarnett.plus.com>

iainemsley wrote:
> Hi,
> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.
> 
> for scene in text.split('Scene'):
>     num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)
>     textNum = num.match(scene)
>     if textNum:
>         print textNum
>     else:
>         print "No scene number"
>     m = '<div type="scene>'
>     m += scene
>     m += '<\div>'
>     print m
> 
The problem is with your regular expression. Unfortunately, I can't tell
what you're trying to match. Could you provide some examples of the
scene numbers?


From invalid at invalid  Wed May  6 14:56:38 2009
From: invalid at invalid (Grant Edwards)
Date: Wed, 06 May 2009 13:56:38 -0500
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another
	program)
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<4A01CEC5.4090008@tim.thechases.com>
	<mailman.5155.1241633576.11746.python-list@python.org>
	<-ZOdnagfEPjuRJzXnZ2dnUVZ_omdnZ2d@posted.visi>
	<mailman.5157.1241635647.11746.python-list@python.org>
Message-ID: <Jp6dnUCXzYr7QJzXnZ2dnUVZ_qGdnZ2d@posted.visi>

On 2009-05-06, Shawn Milochik <Shawn at Milochik.com> wrote:

>>> That way, you can basically use PuTTY to shell into your
>>> Windows box.
>>
>> Better yet, set up sshd in your Cygwin install, and then use
>> whatever terminal you normally use on your Linux/MacOS box to
>> ssh into the Cygwin box. ??When run that way, windows is almost
>> usable...
>
><snip>
>
> True, but when I'm using Cygwin, that means I'm at work and don't have
> a non-MS OS available.

Ouch.  That's too bad.  I spent a few months doing a project
for which the compiler was windows-only.  I found that doing
all of the editing, source-control, and testing on Linux and
sshing into a Cygwin box to do the "make" was minimally
painful.

> Of course I can open an ssh session to my home machine for
> sanity (or kicking off a torrent download at home), but I
> don't have a *nix-based OS at the day job. Lanching DSL
> embedded to use the terminal seems a bit much. ^_^

Probably so.

-- 
Grant Edwards                   grante             Yow! I want a VEGETARIAN
                                  at               BURRITO to go ... with
                               visi.com            EXTRA MSG!!


From python.list at tim.thechases.com  Wed May  6 14:59:19 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 06 May 2009 13:59:19 -0500
Subject: Parsing text
In-Reply-To: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <4A01DE07.1060309@tim.thechases.com>

> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.
> 
> for scene in text.split('Scene'):
>     num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)

The first thing that occurs to me is that this should likely be a 
raw string to get those backslashes into the regexp.  Compare:

   print "^\s\[0-9, i{1,4}, v]"
   print r"^\s\[0-9, i{1,4}, v]"

Without an excerpt of the actual text (or at least the lead-in 
for each scene), it's hard to tell whether this regex finds what 
you expect.  It doesn't look like your regexp finds what you may 
think it does (it looks like you're using commas .

Just so you're aware, your split is a bit fragile too, in case 
any lines contain "Scene".  However, with a proper regexp, you 
can even use it to split the scenes *and* tag the scene-number. 
Something like

   >>> import re
   >>> s = """Scene [42]
   ... this is stuff in the 42nd scene
   ... Scene [IIV]
   ... stuff in the other scene
   ... """
   >>> r = re.compile(r"Scene\s+\[(\d+|[ivx]+)]", re.I)
   >>> r.split(s)[1:]
   ['42', '\nthis is stuff in the 42nd scene\n', 'IIV', '\nstuff 
in the other scene\n']
   >>> def grouper(iterable, groupby):
   ...     iterable = iter(iterable)
   ...     while True:
   ...             yield [iterable.next() for _ in range(groupby)]
   ...

   >>> for scene, content in grouper(r.split(s)[1:], 2):
   ...     print "<div class='scene'><h1>%s</h1><p>%s</p></div>" 
% (scene, content)
   ...
   <div class='scene'><h1>42</h1><p>
   this is stuff in the 42nd scene
   </p></div>
   <div class='scene'><h1>IIV</h1><p>
   stuff in the other scene
   </p></div>

Play accordingly.

-tkc






From stefan_ml at behnel.de  Wed May  6 15:05:04 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 06 May 2009 21:05:04 +0200
Subject: Parsing text
In-Reply-To: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <4a01df61$0$30226$9b4e6d93@newsspool1.arcor-online.net>

iainemsley wrote:
> for scene in text.split('Scene'):
>     num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)
>     textNum = num.match(scene)

Not related to your problem, but to your code - I'd write this as follows:

	match_scene_num = re.compile("^\s\[0-9, i{1,4}, v]", re.I).match

	for scene_section in text.split('Scene'):
	    text_num = match_scene_num(scene_section)

This makes the code more readable and avoids unnecessary work inside the loop.

Stefan


From tjreedy at udel.edu  Wed May  6 15:28:04 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 06 May 2009 15:28:04 -0400
Subject: Separate Windows versions of Python
In-Reply-To: <1fWdnY3Iu8y0MJzXnZ2dnUVZ_uqdnZ2d@pdx.net>
References: <52b28a62-d0de-4d26-b2bd-dc4bf2affb71@p4g2000vba.googlegroups.com>
	<1fWdnY3Iu8y0MJzXnZ2dnUVZ_uqdnZ2d@pdx.net>
Message-ID: <gtsoc3$sgv$2@ger.gmane.org>

Scott David Daniels wrote:

> On windows, major versions (..., 2.5, 2.6, 2.7, ...., 3.0, 3.1,  ...)
> can coexist quite successfully.  Find and run an installer for the
> latest version  of 2.5 (2.5.4, I believe) on the Python download page.
> That will make 2.5 your default Python. 

  believe the installer gives one the choice as to whether or not to 
make the new installation the default -- which is to say, the one 
registered with .py, etc, extensions.



From philip at subaru.naoj.org  Wed May  6 16:03:09 2009
From: philip at subaru.naoj.org (Philip)
Date: Wed, 6 May 2009 20:03:09 +0000 (UTC)
Subject: fcntl and =?utf-8?b?c2lnaW5mb190?= in python
References: <148918f0904281356v534680dcmd03084fe255cb2d3@mail.gmail.com>
	<op.us4mtvitx6zn5v@lepton.softlabbsas.com.ar>
	<148918f0904291012j4c1ada35jcee6030b75b952d0@mail.gmail.com>
	<loom.20090430T233215-925@post.gmane.org>
	<148918f0904301637t5e63537atd85e2a475f4e069f@mail.gmail.com>
	<148918f0905011208u4946c377uce7603bb2e456370@mail.gmail.com>
	<148918f0905040903s7a5c7e5exc2968d0e65540d81@mail.gmail.com>
Message-ID: <loom.20090506T200140-367@post.gmane.org>

ma <mabdelkader <at> gmail.com> writes:
> 
> Ok! So, I decided to write a C-extension instead of using ctypes...
> 
> This works beautifully. Now, I want to release this to the public, so
> I'm thinking of making a bit of code cleanup. Should I just pack the
> entire siginfo_t struct, right now I just use the fd, into a
> dictionary and pass it to the python callback handler function? Maybe
> there might be some more suggestions to what data structures to use,
> so I'm open right now to any of them.

Could we have a look at your working prototype?

Philip J. Tait
http://subarutelescope.org



From mensanator at aol.com  Wed May  6 16:13:55 2009
From: mensanator at aol.com (Mensanator)
Date: Wed, 6 May 2009 13:13:55 -0700 (PDT)
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another 
	program)
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net> 
	<mailman.5154.1241632462.11746.python-list@python.org>
Message-ID: <a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>

On May 6, 12:54 pm, Tim Chase <python.l... at tim.thechases.com> wrote:
> > for windows this works:
> > (can't cut and paste from a dos box!###%*&!!!)
>
> Depending on how it was spawned, you can either right-click in
> the window and choose Mark/Paste (when marking, use <enter> to
> terminate the selection; and selections are blockwise rectangular
> rather than linewise or characterwise).  Alternatively, if you
> click on the system menu (the icon in the title-bar with
> resize/minimize/maximize/close/help), there should be an Edit
> submenu with the same options within.
>
> A pain, but at least feasible.

Less painful is to set the properties of the dos box:

Edit Options:
[x] Quick Edit mode

And when prompted, do "(.) modify shortcut that started this window"

After which, you can dispense with the menus (except when pasting),
just select the text and hit <enter>.

Makes a world of difference.

>
> HTH,
>
> -tkc



From davea at ieee.org  Wed May  6 16:29:23 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 06 May 2009 16:29:23 -0400
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another
	program)
In-Reply-To: <4A01CEC5.4090008@tim.thechases.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<4A01CEC5.4090008@tim.thechases.com>
Message-ID: <4A01F323.4040808@ieee.org>

Tim Chase wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">> for 
> windows this works:
>> (can't cut and paste from a dos box!###%*&!!!)
>
> Depending on how it was spawned, you can either right-click in the 
> window and choose Mark/Paste (when marking, use <enter> to terminate 
> the selection; and selections are blockwise rectangular rather than 
> linewise or characterwise).  Alternatively, if you click on the system 
> menu (the icon in the title-bar with 
> resize/minimize/maximize/close/help), there should be an Edit submenu 
> with the same options within.
>
> A pain, but at least feasible.
>
> HTH,
>
> -tkc
>
>
Note that if you like copy/paste, you can turn on "Quick Edit" mode in 
your cmd.exe windows.  From that same System menu on your DOS box, 
choose "Defaults".  From the first tab that box, enable "Quick Edit" 
checkbox.   This will change the default for subsequent DOS boxes.  You 
can change it just for the current one by using Properties in the same 
system menu.




From davea at ieee.org  Wed May  6 16:46:12 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 06 May 2009 16:46:12 -0400
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another
	program)
In-Reply-To: <a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<mailman.5154.1241632462.11746.python-list@python.org>
	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
Message-ID: <4A01F714.4020602@ieee.org>



Mensanator wrote:
> <snip>
>
> And when prompted, do "(.) modify shortcut that started this window"
>
> After which, you can dispense with the menus (except when pasting),
> just select the text and hit <enter>.
>
>   
To paste into a DOS box, once Quick Edit is enabled, use Right-Click.  
They keystrokes will be sent to the command editor.  Note that the 
interpretation is rather literal, so be careful if copy/pasting more 
than one line, or a line that was wrapped.




From emile at fenx.com  Wed May  6 17:04:44 2009
From: emile at fenx.com (Emile van Sebille)
Date: Wed, 06 May 2009 14:04:44 -0700
Subject: list comprehension question
In-Reply-To: <85d4am8hq4.fsf@agentultra.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>	<85ocucnbce.fsf@agentultra.com>	<mailman.4923.1241193638.11746.python-list@python.org>	<85ljpb8r1o.fsf@agentultra.com>	<mailman.5109.1241543371.11746.python-list@python.org>
	<85d4am8hq4.fsf@agentultra.com>
Message-ID: <gtsttq$k64$1@ger.gmane.org>

On 5/6/2009 6:48 AM J Kenneth King said...
> Emile van Sebille <emile at fenx.com> writes:
>> On 5/5/2009 9:15 AM J Kenneth King said...
>>>  The Python documentation discourages their use and I believe
>>> for good reason.
>> Can you provide a link for this?  I'd like to see specifically what's
>> being discouraged, as I'd be surprised to find routine usage frowned
>> upon.
> http://docs.python.org/tutorial/datastructures.html#nested-list-comprehensions
> 

Thanks.

> 
> "If you?ve got the stomach for it, list comprehensions can be
> nested. They are a powerful tool but ? like all powerful tools ? they
> need to be used carefully, if at all."

Yes, although this is in reference to nested list comprehensions.  Eg,

[xx for xx in [yy for yy in [zz for zz in iterable if z] if y] if x]

The section above on list comprehensions advocates their use saying:

"List comprehensions provide a concise way to create lists without 
resorting to use of map(), filter() and/or lambda. The resulting list 
definition tends often to be clearer than lists built using those 
constructs."

Emile



From rhodri at wildebst.demon.co.uk  Wed May  6 17:15:03 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 06 May 2009 22:15:03 +0100
Subject: Parsing text
In-Reply-To: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <op.uti1bdoba8ncjz@gnudebst>

On Wed, 06 May 2009 19:32:28 +0100, iainemsley <iainemsley at googlemail.com>  
wrote:

> Hi,
> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.

With neither a sample of your data nor the traceback you get, this is
going to require some crystal ball work.  Assuming that all you've got
is running text, I should warn you now that getting this right is a
hard task.  Getting it apparently right and having it fall over in a
heap or badly mangle the text is, unfortunately, very easy.

> for scene in text.split('Scene'):

Not a safe start.  This will split on the word "Scenery" as well, for
example, and doesn't guarantee you the start of a scene by a long way.

>     num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)

This is almost certainly not going to do what you expect, because all
those backslashes in the string are going to get processed as escape
characters before the string is ever passed to re.compile.  Even if
you fix that (by doubling the backslashes or making it a raw string),
I sincerely doubt that this is the regular expression you want.  As
escaped, it matches in sequence:

   * the start of the string
   * a space, tab, newline or other whitespace character.  Just the one.
   * the literal string "[0-9, "
   * either "i" or "I" repeated between 1 and four times
   * the literal string ", "
   * either "v" or "V"
   * the literal string "]"

Assuming you didn't mean to escape the open square bracket doesn't help:

   * the start of the string
   * one whitespace character
   * one of the following characters: 0123456789,iI{}vV

Also, what the heck is this doing *inside* the for loop?

>     textNum = num.match(scene)

If you're using re.match(), the "^" on the regular expression is
redundant.

>     if textNum:
>         print textNum

textNum is the match object, so printing it won't tell you much.  In
particular, it isn't going to produce well-formed XML.

>     else:
>         print "No scene number"

Nor will this.

>     m = '<div type="scene>'

Missing close double quotes after 'scene'.

>     m += scene
>     m += '<\div>'
>     print m

I'm seeing nothing here that should produce an error message that
has anything to do with NoneType.  Any chance of (a) a more accurate
code sample, (b) the traceback, or (c) sample data?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Wed May  6 17:20:29 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 06 May 2009 22:20:29 +0100
Subject: Self function
In-Reply-To: <op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <op.uti1kf0ga8ncjz@gnudebst>

On Wed, 06 May 2009 04:59:59 +0100, Gabriel Genellina  
<gagsl-py2 at yahoo.com.ar> wrote:

> En Tue, 05 May 2009 22:35:08 -0300, Rhodri James  
> <rhodri at wildebst.demon.co.uk> escribi?:
>> On Tue, 05 May 2009 21:43:16 +0100, <bearophileHUGS at lycos.com> wrote:
>>> wolfram.hinde...:
>
>>>> It is easy to change all references of the function name, except for
>>>> those in the function body itself? That needs some explantation.
>>>
>>> I can answer this. If I have a recursive function, I may want to
>>> create a similar function, so I copy and paste it, to later modify the
>>> copied version. Then to change its name I usually don't use a search &
>>> rename of its name into its block of code because it's usually
>>> useless. In non-recursive functions the name of the function is stated
>>> only once, at the top.
>>
>> I'm sorry, but while I'm mildly positive towards the proposal (and more
>> so towards Aaron's decorator), I don't buy this argument at all.  What
>> is broken about your editor's global search-and-replace function that
>> makes it "usually useless" for making these name changes?
>
> It happened to me sometimes. If a module defines some functions, and it  
> doesn't *use* them, why should I use a global search-and-replace to  
> rename something? Modifying the "def" line should be enough - unless the  
> function happens to be recursive.

So the answer to my question would be "nothing"?

> It's the DRY principle in action, the same argument as when decorators  
> where introduced: there should be no need to repeat the function name  
> again and again.

Unless of course you're using it again and again, which you are.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From python-list at smetj.net  Wed May  6 17:27:51 2009
From: python-list at smetj.net (J)
Date: Wed, 06 May 2009 23:27:51 +0200
Subject: SimpleXMLRPCServer and creating a new object on for each new client
	request.
Message-ID: <6de5adbe461e36d4756ae63194286e45@smetj.net>

Hi list,

My goals is to have concurrent and separated client sessions using xmlrpc.
Initially my though was that SimpleXMLRPCServer was able to create a new
object instance for each incoming request.
But this doesn't appear to be the case, unless I'm overlooking something,
if so please point me out.

Concider following simplified code


#!/usr/bin/python

from SimpleXMLRPCServer import SimpleXMLRPCServer
from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler
import random

# Restrict to a particular path.
class RequestHandler(SimpleXMLRPCRequestHandler):
    rpc_paths = ('/RPC2',)

# Create a simple example class
class Randomizer:
        def __init__(self):
                self.random=random.randrange(0,100000)
        def show_random(self):
                return self.random

# Create server
server = SimpleXMLRPCServer(("localhost",
8000),requestHandler=RequestHandler,allow_none=1)
server.register_introspection_functions()

server.register_instance(Randomizer())
server.serve_forever()



I start python interactively:
>>> import xmlrpclib
>>> session1=xmlrpclib.ServerProxy('http://localhost:8000')
>>> session2=xmlrpclib.ServerProxy('http://localhost:8000')
>>> print session1.show_random()
13930
>>> print session2.show_random()
13930
>>> 

I though that session1 and session2 would be 2 different Randomizer objects
each having a different result for self.random
But as the example shows this is not the case.
How can I solve this?

Thanks

Jelle



From mabdelkader at gmail.com  Wed May  6 17:36:02 2009
From: mabdelkader at gmail.com (ma)
Date: Wed, 6 May 2009 17:36:02 -0400
Subject: fcntl and siginfo_t in python
In-Reply-To: <loom.20090506T200140-367@post.gmane.org>
References: <148918f0904281356v534680dcmd03084fe255cb2d3@mail.gmail.com>
	<op.us4mtvitx6zn5v@lepton.softlabbsas.com.ar>
	<148918f0904291012j4c1ada35jcee6030b75b952d0@mail.gmail.com>
	<loom.20090430T233215-925@post.gmane.org>
	<148918f0904301637t5e63537atd85e2a475f4e069f@mail.gmail.com>
	<148918f0905011208u4946c377uce7603bb2e456370@mail.gmail.com>
	<148918f0905040903s7a5c7e5exc2968d0e65540d81@mail.gmail.com>
	<loom.20090506T200140-367@post.gmane.org>
Message-ID: <169B8277-4F9A-4DC3-B486-72796E239238@gmail.com>

Sure, I'll send you the source files when I get a chance!

--Sent from my iPhone

On May 6, 2009, at 4:03 PM, Philip <philip at subaru.naoj.org> wrote:

> ma <mabdelkader <at> gmail.com> writes:
>>
>> Ok! So, I decided to write a C-extension instead of using ctypes...
>>
>> This works beautifully. Now, I want to release this to the public, so
>> I'm thinking of making a bit of code cleanup. Should I just pack the
>> entire siginfo_t struct, right now I just use the fd, into a
>> dictionary and pass it to the python callback handler function? Maybe
>> there might be some more suggestions to what data structures to use,
>> so I'm open right now to any of them.
>
> Could we have a look at your working prototype?
>
> Philip J. Tait
> http://subarutelescope.org
>
> --
> http://mail.python.org/mailman/listinfo/python-list


From pavlovevidence at gmail.com  Wed May  6 17:48:16 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 6 May 2009 14:48:16 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5117.1241549976.11746.python-list@python.org>
	<ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
	<mailman.5133.1241578571.11746.python-list@python.org>
Message-ID: <4d8e738a-bc03-4598-8161-e584a4617699@r36g2000vbr.googlegroups.com>

On May 5, 7:55?pm, Dave Angel <da... at ieee.org> wrote:
> George Oliver wrote:
> > On May 5, 11:59 am, Dave Angel <da... at ieee.org> wrote:
>
> >> 1) forget about getattr() unless you have hundreds of methods in your
> >> map. ?The real question is why you need two maps. What good is the
> >> "command string" doing you? ? Why not just map the keyvalues directly
> >> into function objects?
>
> > Thanks for the reply Dave. I understand your example and it's what I
> > originally used. Here is more detail on what I'm doing now, I hope
> > this will explain my question better.
>
> > In the game I'm writing the player, monsters, items and so on are
> > instances of class Thing, like:
>
> > class Thing(object):
> > ? ? def __init__(self, x, y, name):
> > ? ? ? ? self.x, self.y = x, y
> > ? ? ? ? self.name = name
> > ? ? ? ? self.brain = None
>
> > Some Things have an instance of class Brain attached. The Brain
> > instance has a list of handlers, like:
>
> > class Brain(object):
> > ? ? def __init__(self):
> > ? ? ? ? self.handlers = []
>
> > A handler class defines some functionality for the Brain. Each Brain
> > has an update method like this:
>
> > def update(self, arguments):
> > ? ? for handler in self.handlers:
> > ? ? ? ? handler.update(arguments)
>
> > So on each pass through the main game loop, it calls the update method
> > of all the brains in the game, which run their handler update methods
> > to change the state of the game.
>
> > A handler would be something like a key input handler. The key input
> > handler is defined separately from the command handler in the case I
> > want to use a different method of input, for example a mouse or
> > joystick.
>
> > In the dictionary of key inputs I could map each input directly to a
> > function. However there is no instance name I can call the function
> > on, as I create a thing, add a brain, and add handlers to the brain
> > like this:
>
> > player = Thing(26, 16, 'player')
> > player.brain = Brain()
> > player.brain.add_handlers(
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? commandHandler(player.brain, player),
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? keyboardHandler(player.brain),
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? fovHandler(player.brain))
>
> > So what I'm wondering is how to reference the instance in each brain's
> > list of handlers when I want to map something like a key input to a
> > command, or what a better way might be to structure the code.
>
> ?>>
>
> >>player.brain.add_handlers(
> >> ? ? ? ? ? ? ? ? ? ? ? ? ? ?commandHandler(player.brain, player),
> >> ? ? ? ? ? ? ? ? ? ? ? ? ? ?keyboardHandler(player.brain),
> >> ? ? ? ? ? ? ? ? ? ? ? ? ? ?fovHandler(player.brain))
>
> You're executing commandHandler, and passing its return value into the
> add_handlers() method. ?So commandHandler is a function, not a method,
> and what is its relationship to anything that actually processes commands?

It seems to be a factory function.


> Sorry, your pseudo-code is so far from real code that I can't figure out
> what you're doing. ?So I guess I can't be any help till something else
> turns up to make it clearer. ?Maybe it's just me.

I think it's you--and probably a lot of other people who haven't ever
written games.  No offense.  As someone who's written games before I
will tell you that George's pseudo-code is not far from real code.
His overall approach is fairly typical of how games handle input,
although there are some problems in the details.


Carl Banks


From mensanator at aol.com  Wed May  6 17:49:17 2009
From: mensanator at aol.com (Mensanator)
Date: Wed, 6 May 2009 14:49:17 -0700 (PDT)
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another 
	program)
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net> 
	<mailman.5154.1241632462.11746.python-list@python.org>
	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
	<mailman.5167.1241642789.11746.python-list@python.org>
Message-ID: <82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>

On May 6, 3:46?pm, Dave Angel <da... at ieee.org> wrote:
> Mensanator wrote:
> > <snip>
>
> > And when prompted, do "(.) modify shortcut that started this window"
>
> > After which, you can dispense with the menus (except when pasting),
> > just select the text and hit <enter>.
>
> To paste into a DOS box, once Quick Edit is enabled, use Right-Click. ?
> They keystrokes will be sent to the command editor. ?Note that the
> interpretation is rather literal, so be careful if copy/pasting more
> than one line, or a line that was wrapped.

Well I'll be dipped. Didn't know you could do that.

Of course, since I learned how to call programs from the
script and capture their StdOut, I don't have much call for
cut/paste from dos windows. Hopefully, I'll remember that the
next time I need it.


From jelle at smetj.net  Wed May  6 17:52:47 2009
From: jelle at smetj.net (Jelle Smet)
Date: Wed, 06 May 2009 23:52:47 +0200
Subject: SimpleXMLRPCServer and creating a new object on for each new client
	request.
Message-ID: <add0e6668e04f13e877379d46c0958b0@smetj.net>

Hi list,

My goals is to have concurrent and separated client sessions using xmlrpc.
Initially my though was that SimpleXMLRPCServer was able to create a new
object instance for each incoming request.
But this doesn't appear to be the case, unless I'm overlooking something,
if so please point me out.

Concider following simplified code


#!/usr/bin/python

from SimpleXMLRPCServer import SimpleXMLRPCServer
from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler
import random

# Restrict to a particular path.
class RequestHandler(SimpleXMLRPCRequestHandler):
    rpc_paths = ('/RPC2',)

# Create a simple example class
class Randomizer:
        def __init__(self):
                self.random=random.randrange(0,100000)
        def show_random(self):
                return self.random

# Create server
server = SimpleXMLRPCServer(("localhost",
8000),requestHandler=RequestHandler,allow_none=1)
server.register_introspection_functions()

server.register_instance(Randomizer())
server.serve_forever()



I start python interactively:
>>> import xmlrpclib
>>> session1=xmlrpclib.ServerProxy('http://localhost:8000')
>>> session2=xmlrpclib.ServerProxy('http://localhost:8000')
>>> print session1.show_random()
13930
>>> print session2.show_random()
13930
>>> 

I though that session1 and session2 would be 2 different Randomizer objects
each having a different result for self.random
But as the example shows this is not the case.
How can I solve this?

Thanks

Jelle


From pavlovevidence at gmail.com  Wed May  6 18:07:42 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 6 May 2009 15:07:42 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5117.1241549976.11746.python-list@python.org>
	<ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
Message-ID: <42c18697-15ab-4813-8267-c416fae38642@p4g2000vba.googlegroups.com>

On May 5, 12:17?pm, George Oliver <georgeolive... at gmail.com> wrote:
> A handler would be something like a key input handler. The key input
> handler is defined separately from the command handler in the case I
> want to use a different method of input, for example a mouse or
> joystick.
>
> In the dictionary of key inputs I could map each input directly to a
> function. However there is no instance name I can call the function
> on, as I create a thing, add a brain, and add handlers to the brain
> like this:

What instance do you want to call the functions on?  This is the part
that confuses me.


> player = Thing(26, 16, 'player')
> player.brain = Brain()
> player.brain.add_handlers(
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? commandHandler(player.brain, player),
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? keyboardHandler(player.brain),
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? fovHandler(player.brain))
>
> So what I'm wondering is how to reference the instance in each brain's
> list of handlers when I want to map something like a key input to a
> command, or what a better way might be to structure the code.


I'm going to guess that you want the keyboardHandler to call method of
commandHandler.  There's no reason for commandHandler to be a handler
at all then: keyboardHandler is already handling it.

So here is how I would change it:

player = Thing(26,16,'player')
player.brain = Brain()
responder = commandResponder(player.brain,player)
player.brain.add_handlers(
    keyboardHandler(player.brain,responder),
    joystickHandler(player.brain,responder),
    fovHandler(player.brain),
    )


Carl Banks


From gallium.arsenide at gmail.com  Wed May  6 18:14:30 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Wed, 6 May 2009 15:14:30 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
Message-ID: <a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>

On May 6, 3:29?am, MRAB <goo... at mrabarnett.plus.com> wrote:

> I have the feeling that if the number of rounds is restricted then the
> difference between the minimum and maximum number of byes could be 2
> because of the requirement that players shouldn't play each other more
> than once, meaning that the players have to be shuffled around a bit, so
> a player might play a week earlier or later than would otherwise be the
> case.

This is the feeling that I am getting also.  All my efforts to keep
everything as balanced as possible at all times (to be ready for the
"season" to end suddenly at any time) result in messy jams that could
otherwise be alleviated if I allowed temporary imbalances, knowing
that there are more weeks later to make them up.

John


From e.kroske at gmail.com  Wed May  6 18:25:48 2009
From: e.kroske at gmail.com (Evan Kroske)
Date: Wed, 06 May 2009 18:25:48 -0400
Subject: Python 2.6 worth the hassle?
Message-ID: <4A020E6C.5020406@gmail.com>

I'm planning on learning Python, and I'd like to know which version to 
start with. I know that Python 3.0 isn't ready for production and it 
doesn't have enough libraries yet, so I thought I should learn Python 
2.6. Unfortunately, installing Python 2.6 on my Linux distro (Ubuntu 
Intrepid Ibex) has given me lots of complicated problems I really don't 
want to deal with.

My essential question is "Is Python 2.6 similar enough to Python 3.0 to 
justify its complexity of installation?" Upgrading to Jaunty is NOT an 
option 
(http://welcome2obscurity.blogspot.com/2009/05/jaunty-jackalope-released-vista-all.html).

Best regards,
Evan Kroske
Undecided Python Student


From mirthyn at gmail.com  Wed May  6 18:32:58 2009
From: mirthyn at gmail.com (Ani)
Date: Wed, 6 May 2009 19:32:58 -0300
Subject: removing row from table. PyQT
Message-ID: <75097f100905061532y4685fed6ue7f19904a4964552@mail.gmail.com>

I'm trying to remove the selected rows from the table,
but it's not working, i've tried many ways, don't know what I'm missing.

code below:


class MonitorUi(QWidget):

    def __init__(self,parent = None):
        QWidget.__init__(self,parent)

        self._initalTable =
[["none","none","none"],["none","none","none"],["none","none","none"]]

        self.lista=""
        self.headerH =
["Id","UserName","Engine","Proj","FileToRender","StartFrame","EndFrame","Packets","Skip","Attr","Status"]

        self.setWindowTitle("RenderMonitor")
        self.setGeometry(150,150,1000,500)
        self.setWindowIcon(QIcon('monkey.png'))


        timer = QTimer(self)
        self.ItemEdit = QLineEdit()
        self.buttonRemove = QPushButton("remove")
        self.buttonRende = QPushButton("Rende!")
        self.tableWidget = QTableWidget(1000,11)



        layoutH = QHBoxLayout()
        layoutH.addWidget(self.ItemEdit)
        #layoutH.addStretch(1)
        layoutH.addWidget(self.buttonRemove)
        layoutH.addWidget(self.buttonRende)

        layoutV = QVBoxLayout()
        layoutV.addLayout(layoutH)
        layoutV.addWidget(self.tableWidget)


        self.setLayout(layoutV)

        self.connect(self.buttonRemove, SIGNAL("clicked()"), self.remove)
        self.connect(self.buttonRende, SIGNAL("clicked()"),
self.MsgServerRender)


        timer.start(1000)
        QObject.connect(timer, SIGNAL("timeout()"), self.displayTable)



    def setDataBridge(self,dataInst):
        self.lista = dataInst

    def clearTable(self):
        self.tableWidget.clear()

    def remove(self):
        print "removendo da tabela"
        #self.tableWidget.removeRow(self.tableView.selectedIndexes())
        self.tableWidget.removeRow(self.tableWidget.selectedRows)
#self.mapper.toNext()
#self.tableView.selectRow(self.mapper.currentIndex())

    def MsgServerRender(self):
        sender = ClientMsgRender()
        sender.sendTo("run")

    def displayTable(self):

        print "display table"
        self.tableWidget.setHorizontalHeaderLabels(self.headerH)
        self.headerV=[]
        list2= self.lista.getInfo()

        item = 0
        linha = 0
        while item < len(list2):

            #self.tableWidget = QTableWidget(item,9)
            self.headerV.append(("job" + str(item)))
            elemento = 0
            coluna = 0

            while elemento < 11 :
                str(list2[item][elemento])
                NewTableitem = QTableWidgetItem(list2[item][elemento])
                #NewTableitem.setFlags(Qt.ItemIsSelectable |
 Qt.ItemIsEnabled )#no editable item
                #NewTableitem.setFlags(Qt.ItemIsEnabled )#no editable item
                self.tableWidget.setItem(linha,coluna, NewTableitem)


                elemento += 1
                coluna += 1

            item += 1
            linha += 1

        self.tableWidget.setVerticalHeaderLabels(self.headerV)
-------------- next part --------------
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From kyrie at uh.cu  Wed May  6 18:33:20 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Wed, 06 May 2009 18:33:20 -0400
Subject: Self function
In-Reply-To: <op.uti1kf0ga8ncjz@gnudebst>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
	<op.uti1kf0ga8ncjz@gnudebst>
Message-ID: <1241649200.4a0210301f77e@mail.uh.cu>


Quoting Rhodri James <rhodri at wildebst.demon.co.uk>:

> >> I'm sorry, but while I'm mildly positive towards the proposal (and more
> >> so towards Aaron's decorator), I don't buy this argument at all.  What
> >> is broken about your editor's global search-and-replace function that
> >> makes it "usually useless" for making these name changes?
> >
> > It happened to me sometimes. If a module defines some functions, and it  
> > doesn't *use* them, why should I use a global search-and-replace to  
> > rename something? Modifying the "def" line should be enough - unless the  
> > function happens to be recursive.
> 
> So the answer to my question would be "nothing"?

Indeed, there is nothing broken with the search and replace feature of his
editor. When he is copying a non-recursive function, it is _useless_ to do a
search and replace. When he is copying a recursive function, it is _required_ to
do a search and replace.

So, the very same task requires you to either perform a task that will almost
always be useless (or even dangerous), or to read the source code to find out if
the function is recursive, so that you can use the search and replace only then.

(I know that the "problem" is present in almost all programming languages... but
that's not what is being discussed. Bearophile's concerns seem legitimate, and
you should not dismiss them so lightly just because there are ways to do more
work and hopefully avoid the problems. I'd say that the "problem" is even
aggravated in python, where the dynamic nature of the language makes it near to
impossible to build good refactoring tools) 

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie

-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From Scott.Daniels at Acm.Org  Wed May  6 18:41:00 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 06 May 2009 15:41:00 -0700
Subject: Copy & Paste in a Dos box
In-Reply-To: <mailman.5167.1241642789.11746.python-list@python.org>
References: <4A01AD6E.4010807@umbc.edu>
	<4A01CD29.3010507@hughes.net>	<mailman.5154.1241632462.11746.python-list@python.org>	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
	<mailman.5167.1241642789.11746.python-list@python.org>
Message-ID: <uoWdnYQnGaNQjZ_XnZ2dnUVZ_qKdnZ2d@pdx.net>

Dave Angel wrote:
> Mensanator wrote:
>> ... After which, you can dispense with the menus (except when pasting),
>> just select the text and hit <enter>.
>>
> To paste into a DOS box, once Quick Edit is enabled, use Right-Click.  
> They keystrokes will be sent to the command editor.  Note that the 
> interpretation is rather literal, so be careful if copy/pasting more 
> than one line, or a line that was wrapped.

Also, you can type into the cmd window:

     Alt-Space  E  P

Alt-Space
       <get to menu>
    E
       <Edit submenu>
    P
       <Paste>

--Scott David Daniels
Scott.Daniels at Acm.Org


From tjreedy at udel.edu  Wed May  6 18:52:22 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 06 May 2009 18:52:22 -0400
Subject: Python 2.6 worth the hassle?
In-Reply-To: <4A020E6C.5020406@gmail.com>
References: <4A020E6C.5020406@gmail.com>
Message-ID: <gtt4b7$7bc$1@ger.gmane.org>

Evan Kroske wrote:
> I'm planning on learning Python, and I'd like to know which version to 
> start with. I know that Python 3.0 isn't ready for production and it 

3.1 will be. The first beta will be out very soon and 3.1 in less than 2 
months.

> doesn't have enough libraries yet,

That will take longer.  I hope the improvement in 3.1 will inspire more 
conversions.

> so I thought I should learn Python 2.6. Unfortunately, installing Python 2.6 on my Linux distro (Ubuntu 
> Intrepid Ibex) has given me lots of complicated problems I really don't 
> want to deal with.
> 
> My essential question is "Is Python 2.6 similar enough to Python 3.0 to 
> justify its complexity of installation?" Upgrading to Jaunty is NOT an 
> option 
> (http://welcome2obscurity.blogspot.com/2009/05/jaunty-jackalope-released-vista-all.html). 

You could use 2.5 and write with an eye to the future.  Use 'object' or 
some derivative thereof as a base for all your classes.  Never use cmp() 
or .__cmp__().  Don't use string exceptions.  Look in 3.0 What's new for 
anything else to avoid.

tjr



From benjamin at python.org  Wed May  6 19:01:25 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Wed, 6 May 2009 18:01:25 -0500
Subject: [RELEASED] Python 3.1 beta 1
Message-ID: <1afaf6160905061601l1fac114ei4ffd0f4f35826640@mail.gmail.com>

On behalf of the Python development team, I'm thrilled to announce the first and
only beta release of Python 3.1.

Python 3.1 focuses on the stabilization and optimization of features and changes
Python 3.0 introduced.  For example, the new I/O system has been rewritten in C
for speed.  File system APIs that use unicode strings now handle paths with
undecodable bytes in them. [1] Other features include an ordered dictionary
implementation and support for ttk Tile in Tkinter.  For a more extensive list
of changes in 3.1, see http://doc.python.org/dev/py3k/whatsnew/3.1.html or
Misc/NEWS in the Python distribution.

Please note that this is a beta release, and as such is not suitable for
production environments.  We continue to strive for a high degree of quality,
but there are still some known problems and the feature sets have not been
finalized.  This beta is being released to solicit feedback and hopefully
discover bugs, as well as allowing you to determine how changes in 3.1 might
impact you.  If you find things broken or incorrect, please submit a bug report
at

     http://bugs.python.org

For more information and downloadable distributions, see the Python 3.1 website:

     http://www.python.org/download/releases/3.1/

See PEP 375 for release schedule details:

     http://www.python.org/dev/peps/pep-0375/



Enjoy,
-- Benjamin

Benjamin Peterson
benjamin at python.org
Release Manager
(on behalf of the entire python-dev team and 3.1's contributors)


From norseman at hughes.net  Wed May  6 19:02:06 2009
From: norseman at hughes.net (norseman)
Date: Wed, 06 May 2009 16:02:06 -0700
Subject: Copy & Paste in a Dos box
In-Reply-To: <2dc0c81b0905061112l32426cb8rafa3a86dca12810d@mail.gmail.com>
References: <4A01AD6E.4010807@umbc.edu>
	<4A01CD29.3010507@hughes.net>	<4A01CEC5.4090008@tim.thechases.com>
	<2dc0c81b0905061112l32426cb8rafa3a86dca12810d@mail.gmail.com>
Message-ID: <4A0216EE.8050007@hughes.net>

Shawn Milochik wrote:
> On Wed, May 6, 2009 at 1:54 PM, Tim Chase <python.list at tim.thechases.com> wrote:
>>> for windows this works:
>>> (can't cut and paste from a dos box!###%*&!!!)
>> Depending on how it was spawned, you can either right-click in the window
>> and choose Mark/Paste (when marking, use <enter> to terminate the selection;
>> and selections are blockwise rectangular rather than linewise or
>> characterwise).  Alternatively, if you click on the system menu (the icon in
>> the title-bar with resize/minimize/maximize/close/help), there should be an
>> Edit submenu with the same options within.
>>
>> A pain, but at least feasible.
> <snip>
> 
> I know I'm coming to the conversation late, but here's what I do*:
> 
> 1. Use Cygwin. (http://www.cygwin.com/)
> 2. Use PuttyCYG (http://code.google.com/p/puttycyg/)
> 
> That way, you can basically use PuTTY to shell into your Windows box.
> 
> Note: If you are familiar with the Linux command line, you will be in
> love with this solution. If you're a Windows-only type, then be
> forewarned that doing this will require you to type Unix/Linux
> commands (for the most part) instead of DOS commands.
> 
> *Disclaimer: I use a Mac and Linux. This is my workaround when forced
> to use Windows. Your environment preferences may vary.
> --
> http://mail.python.org/mailman/listinfo/python-list
===================================

Nope and no thanks.

I'm talking about a Dos Box on Win XP Pro
For Tim - I get junk from somewhere else in the system.
I recognize it from hours and many open/close boxes ago, but it's not 
what I 'swiped".

For Shawn - why would I want to run synthesizers? Or any other ...
(There is nothing wrong with Cygwin, just not on everybody's system.
Didn't come with the package.)

I write in Linux and test on other peoples Window$
                                              ^
                                              Thunderbird did not mark 
that as a miss spelling?!!!  Three cheers for them!

Objective - stick with out of the box to get way less install problems.



Steve


From tjreedy at udel.edu  Wed May  6 19:02:59 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 06 May 2009 19:02:59 -0400
Subject: About ODFPY links
In-Reply-To: <862e00220905060253j290672acu86f18fc1bcd6bb2a@mail.gmail.com>
References: <862e00220905060253j290672acu86f18fc1bcd6bb2a@mail.gmail.com>
Message-ID: <gtt4v4$8vg$1@ger.gmane.org>

shruti surve wrote:
> hey all,
>  For my project, i am using ODFpy open office spreadsheets. I am 
> creating ledgers in python ie.ledger.py <http://ie.ledger.py>.  So when 
> i run ledger.py, spreadsheet will be opened in open office. since ledger 
> is made of number of accounts, i am creating multiple tables for all 
> accounts in single spreadsheet. So, there are number of tables in one 
> spreadsheet.  Now i want create links in each table of spreadsheet so 
> that i can connect multiple tables. SO can anyone please tell me how to 
> create links in odfpy..

The general answer to such questions is to make a minimal doc in some 
ODF application such of OOo that has the desired feature, save, open the 
doc as a zip file (unless saved as xml) and extract the pieces as xml. 
Then find the text that represents that feature.  There is a close 
correspondance between the xml and the internal document object model 
created by odfpy (and OOo, etc).

In your case, make a spreadsheet with two table.  Give one one literal 
entry.  Give the other one entry that links to the first.  Then look in 
the xml to see how links are presented.  That should give a hint as to 
how to do the same in odfpy.  Then try to recreate the minimal doc with 
odfpy and look at the xml *it* produces.  If it looks similar enough, 
open with OOo to see what you get.

tjr



From norseman at hughes.net  Wed May  6 19:10:18 2009
From: norseman at hughes.net (norseman)
Date: Wed, 06 May 2009 16:10:18 -0700
Subject: Copy & Paste in a Dos box
In-Reply-To: <a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<mailman.5154.1241632462.11746.python-list@python.org>
	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
Message-ID: <4A0218DA.8080209@hughes.net>

Mensanator wrote:
> On May 6, 12:54 pm, Tim Chase <python.l... at tim.thechases.com> wrote:
>>> for windows this works:
>>> (can't cut and paste from a dos box!###%*&!!!)
>> Depending on how it was spawned, you can either right-click in
>> the window and choose Mark/Paste (when marking, use <enter> to
>> terminate the selection; and selections are blockwise rectangular
>> rather than linewise or characterwise).  Alternatively, if you
>> click on the system menu (the icon in the title-bar with
>> resize/minimize/maximize/close/help), there should be an Edit
>> submenu with the same options within.
>>
>> A pain, but at least feasible.
> 
> Less painful is to set the properties of the dos box:
> 
> Edit Options:
> [x] Quick Edit mode
> 
> And when prompted, do "(.) modify shortcut that started this window"
> 
> After which, you can dispense with the menus (except when pasting),
> just select the text and hit <enter>.
> 
> Makes a world of difference.
> 
>> HTH,
>>
>> -tkc
> 
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
===================
On a straight box - that doesn't work either.
The select all does, but paste yanked something from hours ago.
Yes - set as stated, closed and used icon to open box.

MicroSoft still need to soften its hard head and join the 21st century.

I love the ease of Linux.

One thing we do get from using both OS's - our first release code is 
much more solid as a result.

Steve


From gherron at islandtraining.com  Wed May  6 19:12:48 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Wed, 06 May 2009 16:12:48 -0700
Subject: Python 2.6 worth the hassle?
In-Reply-To: <4A020E6C.5020406@gmail.com>
References: <4A020E6C.5020406@gmail.com>
Message-ID: <4A021970.9090705@islandtraining.com>

Evan Kroske wrote:
> I'm planning on learning Python, and I'd like to know which version to 
> start with. I know that Python 3.0 isn't ready for production and it 
> doesn't have enough libraries yet, so I thought I should learn Python 
> 2.6. Unfortunately, installing Python 2.6 on my Linux distro (Ubuntu 
> Intrepid Ibex) has given me lots of complicated problems I really 
> don't want to deal with.

Just learn 2.5.  From the beginners point of view, 2.5 and 2.6 are 
virtually the same.  (If you work hard, you can find differences, but 
you did say you were a beginner -- so don't worry about the differences 
-- they are minor and evolutionary not revolutionary.)


Gary Herron


>
> My essential question is "Is Python 2.6 similar enough to Python 3.0 
> to justify its complexity of installation?" Upgrading to Jaunty is NOT 
> an option 
> (http://welcome2obscurity.blogspot.com/2009/05/jaunty-jackalope-released-vista-all.html). 
>
>
> Best regards,
> Evan Kroske
> Undecided Python Student
> -- 
> http://mail.python.org/mailman/listinfo/python-list



From martin.hellwig at dcuktec.org  Wed May  6 19:13:53 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 07 May 2009 00:13:53 +0100
Subject: SimpleXMLRPCServer and creating a new object on for each new
	client request.
In-Reply-To: <mailman.5173.1241647285.11746.python-list@python.org>
References: <mailman.5173.1241647285.11746.python-list@python.org>
Message-ID: <sKCdnS2oXZIuhJ_XnZ2dnUVZ8tKdnZ2d@bt.com>

Jelle Smet wrote:
> Hi list,
> 
> My goals is to have concurrent and separated client sessions using xmlrpc.
> Initially my though was that SimpleXMLRPCServer was able to create a new
> object instance for each incoming request.
> But this doesn't appear to be the case, unless I'm overlooking something,
> if so please point me out.
> 
> Concider following simplified code
> 
<cut code>
SimpleXMLRPCServer, is rather, well eh, simple and does not support 
sessions, which in an HTTP point of view makes sense (where XML-RPC is 
based on). So either build in some sort of session management or rewrite 
your functionality in such a ways that it isn't dependent on sessions 
(see my reimplementation after my sig).

-- 
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'

#! /usr/bin/env python
#'----------------example reimplementation----------------------------'
"XML RPC test"
import SocketServer
import SimpleXMLRPCServer
import random
import xmlrpclib
import threading


# Create a simple example class
class Randomizer(object):
     "Randomizer Docstring"
     def __init__(self):
         self.random_number = None

     def randomize(self):
         "create a new random number"
         self.random_number = random.randrange(0, 100000)

     def show_random(self):
         "show_random Docstring"
         self.randomize()
         return(self.random_number)

class Server(SocketServer.ThreadingMixIn,
              SimpleXMLRPCServer.SimpleXMLRPCServer):
     "Multi-threaded XML RPC Server"
     # pylint: disable-msg=R0904
     def __init__(self):
         address = ('localhost', 8000)
         SimpleXMLRPCServer.SimpleXMLRPCServer.__init__(self, address)
         self.allow_none = True
         self.register_instance(Randomizer())
         self.register_function(self.shutdown_service)
         self.register_introspection_functions()
     # pylint: enable-msg=R0904

     def shutdown_service(self):
         "Stop server"
         self.shutdown()


class Thread(threading.Thread):
     "Run Server in a thread for testing purposes"
     def run(self):
         "Run the service"
         service = Server()
         service.serve_forever()

if __name__ == '__main__':
     URL_PORT = 'http://localhost:8000'
     TEST_THREAD = Thread()
     TEST_THREAD.start()
     SESSION1 = xmlrpclib.ServerProxy(URL_PORT)
     SESSION2 = xmlrpclib.ServerProxy(URL_PORT)
     print(SESSION1.show_random())
     print(SESSION2.show_random())
     SESSION_STOP = xmlrpclib.ServerProxy(URL_PORT)
     SESSION_STOP.shutdown_service()
#'----------------example reimplementation----------------------------'


From google at mrabarnett.plus.com  Wed May  6 19:15:27 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 07 May 2009 00:15:27 +0100
Subject: Copy & Paste in a Dos box
In-Reply-To: <82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<mailman.5154.1241632462.11746.python-list@python.org>	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>	<mailman.5167.1241642789.11746.python-list@python.org>
	<82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>
Message-ID: <4A021A0F.1040800@mrabarnett.plus.com>

Mensanator wrote:
> On May 6, 3:46 pm, Dave Angel <da... at ieee.org> wrote:
>> Mensanator wrote:
>>> <snip>
>>> And when prompted, do "(.) modify shortcut that started this window"
>>> After which, you can dispense with the menus (except when pasting),
>>> just select the text and hit <enter>.
>> To paste into a DOS box, once Quick Edit is enabled, use Right-Click.  
>> They keystrokes will be sent to the command editor.  Note that the
>> interpretation is rather literal, so be careful if copy/pasting more
>> than one line, or a line that was wrapped.
> 
> Well I'll be dipped. Didn't know you could do that.
> 
> Of course, since I learned how to call programs from the
> script and capture their StdOut, I don't have much call for
> cut/paste from dos windows. Hopefully, I'll remember that the
> next time I need it.
> 
That's new to me too!

You probably already know that if you drag-and-drop a file onto the
window you get its path.


From amrbekhit at gmail.com  Wed May  6 19:23:14 2009
From: amrbekhit at gmail.com (Amr)
Date: Wed, 6 May 2009 16:23:14 -0700 (PDT)
Subject: Could this expression parser be more 'Pythonic'?
Message-ID: <e8f3a550-647b-4ce2-bae3-c160e42e5439@j12g2000vbl.googlegroups.com>

Hello all,

I've been spending the last few weeks learning Python, and I've just
started to use it to write a simple BASIC compiler. I'm writing a
mathematical expression parser and wrote a function that would take a
string and split it into high level tokens.

The code can be found at http://pastebin.com/f757252ec (have a look at
the function tokenize).

I was interested to see if the tokenize function could be written in a
better way, so as to make better use of the Python language and
libraries. One thing that sprung to mind was whether it would be a
good idea to perhaps take advantage of regular expressions. I had a
look at a few compiler sites and regexps seem to come into that role
quite a bit. I've only done a little work on regexps and they seem
very powerful, but can easily get out of control!

So, any suggestions as to how to make better use of the language
writing something like this?

Thanks,

--Amr


From norseman at hughes.net  Wed May  6 19:28:34 2009
From: norseman at hughes.net (norseman)
Date: Wed, 06 May 2009 16:28:34 -0700
Subject: Copy & Paste in a Dos box
In-Reply-To: <4A01F323.4040808@ieee.org>
References: <4A01AD6E.4010807@umbc.edu>
	<4A01CD29.3010507@hughes.net>	<4A01CEC5.4090008@tim.thechases.com>
	<4A01F323.4040808@ieee.org>
Message-ID: <4A021D22.5010508@hughes.net>

Dave Angel wrote:
> Tim Chase wrote:
>> <div class="moz-text-flowed" style="font-family: -moz-fixed">> for 
>> windows this works:
>>> (can't cut and paste from a dos box!###%*&!!!)
>>
>> Depending on how it was spawned, you can either right-click in the 
>> window and choose Mark/Paste (when marking, use <enter> to terminate 
>> the selection; and selections are blockwise rectangular rather than 
>> linewise or characterwise).  Alternatively, if you click on the system 
>> menu (the icon in the title-bar with 
>> resize/minimize/maximize/close/help), there should be an Edit submenu 
>> with the same options within.
>>
>> A pain, but at least feasible.
>>
>> HTH,
>>
>> -tkc
>>
>>
> Note that if you like copy/paste, you can turn on "Quick Edit" mode in 
> your cmd.exe windows.  From that same System menu on your DOS box, 
> choose "Defaults".  From the first tab that box, enable "Quick Edit" 
> checkbox.   This will change the default for subsequent DOS boxes.  You 
> can change it just for the current one by using Properties in the same 
> system menu.
> 
> 
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 
====================

HuMMMMMM - Dave's use of cmd.exe as different from Dos Box points out a 
miss name on my part. I should have said cmd.exe originally.

Yes - I use dosemu on Linux Slackware 10.2 with enlightenment 16.2 and 
swipe/paste works as it should. (Of course gpm is loaded. That's a must. :)

I have been cutting back. Used to have 6 keyboards going at once. (well 
in packet passing mode shall we say? When computers were slower. :) 
Down to two close by and two across the way. One Solaris, two Linux, one 
Win XP.  Gotta keep the Win machine nearby. It needs its daily crash. I 
have learned to stick to 'stock' setups or pay a heavy price at "show time".

I tried the settings again just now.
I did both Properties and Default and made sure they were set the same.
I did the --- for icon --- and killed the open box and clicked the icon 
and swiped and pasted to wordpad.  IT FINALLY WORKED!!!

Hadn't intended to start such a rash of dialog, but I benefited too!

Thanks guys!!!


Steve


From mensanator at aol.com  Wed May  6 19:38:37 2009
From: mensanator at aol.com (Mensanator)
Date: Wed, 6 May 2009 16:38:37 -0700 (PDT)
Subject: Copy & Paste in a Dos box
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net> 
	<mailman.5154.1241632462.11746.python-list@python.org>
	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
	<mailman.5167.1241642789.11746.python-list@python.org>
	<82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>
	<mailman.5182.1241651712.11746.python-list@python.org>
Message-ID: <6640b734-80a7-4292-8223-7c00f5538261@r3g2000vbp.googlegroups.com>

On May 6, 6:15?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Mensanator wrote:
> > On May 6, 3:46 pm, Dave Angel <da... at ieee.org> wrote:
> >> Mensanator wrote:
> >>> <snip>
> >>> And when prompted, do "(.) modify shortcut that started this window"
> >>> After which, you can dispense with the menus (except when pasting),
> >>> just select the text and hit <enter>.
> >> To paste into a DOS box, once Quick Edit is enabled, use Right-Click. ?
> >> They keystrokes will be sent to the command editor. ?Note that the
> >> interpretation is rather literal, so be careful if copy/pasting more
> >> than one line, or a line that was wrapped.
>
> > Well I'll be dipped. Didn't know you could do that.
>
> > Of course, since I learned how to call programs from the
> > script and capture their StdOut, I don't have much call for
> > cut/paste from dos windows. Hopefully, I'll remember that the
> > next time I need it.
>
> That's new to me too!
>
> You probably already know that if you drag-and-drop a file onto the
> window you get its path.

Damn! I may just go back to using Python from the command prompt
instead of using IDLE.

On second thought, IDLE is way too useful for indenting, dedenting,
commenting and uncommenting blocks of code. Can't go back to using
Notepad.



From tomf.sessile at gmail.com  Wed May  6 19:40:19 2009
From: tomf.sessile at gmail.com (TomF)
Date: Wed, 6 May 2009 16:40:19 -0700
Subject: Simple way of handling errors
Message-ID: <2009050616401916807-tomfsessile@gmailcom>

As a relative newcomer to Python, I like it a lot but I'm dismayed at 
the difficulty of handling simple errors.  In Perl if you want to 
anticipate a file-not-found error you can simply do:

open($file)  or die("open($file): $!");

and you get an intelligible error message.  In Python, to get the same 
thing it appears you need at least:

try:
    f=open(file)
except IOError, err:
    print "open(%s): got %s" % (file, err.strerror)
    exit(-1)

Is there a simpler interface or idiom for handling such errors?  I 
appreciate that Python's exception handling is much more sophisticated 
but often I don't need it.

-Tom



From DustanGroups at gmail.com  Wed May  6 19:41:25 2009
From: DustanGroups at gmail.com (Dustan)
Date: Wed, 6 May 2009 16:41:25 -0700 (PDT)
Subject: How do I escape slashes the string formatting operator? (or: why is 
	it behaving this way?)
Message-ID: <c30ba5fa-72bb-4d55-89f9-840acb10166c@b1g2000vbc.googlegroups.com>

Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
(Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> 'HELP!%(xyz)/' % {'xyz':' PLEASE! '}
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: unsupported format character '/' (0x2f) at index 11
>>>

It doesn't like the forward slash after the closed parentheses. I
don't know what it is expecting, but I need that slash there
(obviously this is a simplified example).

All help appreciated.


From marek.rocki at wp.pl  Wed May  6 19:51:57 2009
From: marek.rocki at wp.pl (marek.rocki at wp.pl)
Date: Wed, 6 May 2009 16:51:57 -0700 (PDT)
Subject: How do I escape slashes the string formatting operator? (or: why 
	is it behaving this way?)
References: <c30ba5fa-72bb-4d55-89f9-840acb10166c@b1g2000vbc.googlegroups.com>
Message-ID: <73c3f3a0-9fda-4eab-b46b-2cbe3f4baf1f@v17g2000vbb.googlegroups.com>

Dustan napisa?(a):
> Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
> (Intel)] on
> win32
> Type "help", "copyright", "credits" or "license" for more information.
> >>> 'HELP!%(xyz)/' % {'xyz':' PLEASE! '}
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> ValueError: unsupported format character '/' (0x2f) at index 11
> >>>
>
> It doesn't like the forward slash after the closed parentheses. I
> don't know what it is expecting, but I need that slash there
> (obviously this is a simplified example).
>
> All help appreciated.

Strign formatting docs (http://docs.python.org/library/
stdtypes.html#string-formatting) say that specifying a conversion type
is mandatory. So you actually should write something like:
'HELP!%(xyz)s/' % {'xyz':' PLEASE! '}


From DustanGroups at gmail.com  Wed May  6 19:58:42 2009
From: DustanGroups at gmail.com (Dustan)
Date: Wed, 6 May 2009 16:58:42 -0700 (PDT)
Subject: How do I escape slashes the string formatting operator? (or: why 
	is it behaving this way?)
References: <c30ba5fa-72bb-4d55-89f9-840acb10166c@b1g2000vbc.googlegroups.com>
	<73c3f3a0-9fda-4eab-b46b-2cbe3f4baf1f@v17g2000vbb.googlegroups.com>
Message-ID: <8a4c5d87-9a8b-479a-991c-38704787042a@s31g2000vbp.googlegroups.com>

On May 6, 6:51?pm, marek.ro... at wp.pl wrote:
> Dustan napisa?(a):
>
> > Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
> > (Intel)] on
> > win32
> > Type "help", "copyright", "credits" or "license" for more information.
> > >>> 'HELP!%(xyz)/' % {'xyz':' PLEASE! '}
> > Traceback (most recent call last):
> > File "<stdin>", line 1, in <module>
> > ValueError: unsupported format character '/' (0x2f) at index 11
>
> > It doesn't like the forward slash after the closed parentheses. I
> > don't know what it is expecting, but I need that slash there
> > (obviously this is a simplified example).
>
> > All help appreciated.
>
> Strign formatting docs (http://docs.python.org/library/
> stdtypes.html#string-formatting) say that specifying a conversion type
> is mandatory. So you actually should write something like:
> 'HELP!%(xyz)s/' % {'xyz':' PLEASE! '}

Thanks. That seems to have worked nicely.


From google at mrabarnett.plus.com  Wed May  6 20:01:46 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 07 May 2009 01:01:46 +0100
Subject: removing row from table. PyQT
In-Reply-To: <75097f100905061532y4685fed6ue7f19904a4964552@mail.gmail.com>
References: <75097f100905061532y4685fed6ue7f19904a4964552@mail.gmail.com>
Message-ID: <4A0224EA.7040108@mrabarnett.plus.com>

Ani wrote:
> I'm trying to remove the selected rows from the table,
> but it's not working, i've tried many ways, don't know what I'm missing.
> 
> code below:
> 
[snip]

>     def remove(self):    
>         print "removendo da tabela"
>         #self.tableWidget.removeRow(self.tableView.selectedIndexes())
>         self.tableWidget.removeRow(self.tableWidget.selectedRows)
> #self.mapper.toNext()
> #self.tableView.selectRow(self.mapper.currentIndex())
> 
[snip]
 From the name I'd say that removeRow() can remove only a single row at a
time. Try removing the rows one at a time, in reverse order (from
highest to lowest index).



From googler.1.webmaster at spamgourmet.com  Wed May  6 20:13:29 2009
From: googler.1.webmaster at spamgourmet.com (googler.1.webmaster at spamgourmet.com)
Date: Wed, 6 May 2009 17:13:29 -0700 (PDT)
Subject: Threading and GIL
Message-ID: <60538e1c-47ea-4120-bc91-a9dcebd8f14b@r34g2000vbi.googlegroups.com>

Hi!

I have a big problem I can't solve and I hope anyone of you can help
me. I use the Python C API and in C++ I have a class which represets a
thread object, similiar to the thread class of the known Python Thread
class but with some needed additions so thats the reason why I have to
built my own. Well, this is the problem.

There is a method called Thread::End() which I can call in Python. But
now the End() Function waits until the "Main" Function of my C++ class
is done, but in this method I want to ensure the Global Interpreter
Lock but this is already locked by the Thread which executes the End()
command. So both is waiting and stops. The thread which calls the End
() method is waiting for the finish of the Main() method of the Thread
Class and the Main-Method in the other thread waits for the thread of
the End() command that this is done - welcome Deadlock.

Any suggestions what I have to do? Thank you veeery much for you help,
otherwise I become really crazy here because this is the first time I
have such a problem.


Bye :)


From davea at ieee.org  Wed May  6 20:15:11 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 06 May 2009 20:15:11 -0400
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another
	program)
In-Reply-To: <82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<mailman.5154.1241632462.11746.python-list@python.org>	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>	<mailman.5167.1241642789.11746.python-list@python.org>
	<82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>
Message-ID: <4A02280F.9010606@ieee.org>

Mensanator wrote:
> On May 6, 3:46 pm, Dave Angel <da... at ieee.org> wrote:
>   
>> Mensanator wrote:
>>     
>>> <snip>
>>>       
>>> And when prompted, do "(.) modify shortcut that started this window"
>>>       
>>> After which, you can dispense with the menus (except when pasting),
>>> just select the text and hit <enter>.
>>>       
>> To paste into a DOS box, once Quick Edit is enabled, use Right-Click.  
>> They keystrokes will be sent to the command editor.  Note that the
>> interpretation is rather literal, so be careful if copy/pasting more
>> than one line, or a line that was wrapped.
>>     
>
> Well I'll be dipped. Didn't know you could do that.
>
> Of course, since I learned how to call programs from the
> script and capture their StdOut, I don't have much call for
> cut/paste from dos windows. Hopefully, I'll remember that the
> next time I need it.
>
>   
As long as we're in Quick Edit mode, another trick is that you can 
double-click on a "word" in a DOS box to select it and copy to 
clipboard.  Obviously it isn't always the exact string you want, but 
sometimes it beats dragging the mouse over the text.




From davea at ieee.org  Wed May  6 20:29:42 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 06 May 2009 20:29:42 -0400
Subject: Copy & Paste in a Dos box
In-Reply-To: <4A0218DA.8080209@hughes.net>
References: <4A01AD6E.4010807@umbc.edu>
	<4A01CD29.3010507@hughes.net>	<mailman.5154.1241632462.11746.python-list@python.org>	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
	<4A0218DA.8080209@hughes.net>
Message-ID: <4A022B76.4040507@ieee.org>

norseman wrote:
> <snip>
> On a straight box - that doesn't work either.
> The select all does, but paste yanked something from hours ago.
>
> <snip>
Once you have Quick Edit enabled, paste will work using right-click.  If 
it got something from hours ago, then that must be the last time you 
copied anything to the real clipboard.  Note that some applications use 
a private clipboard to give extra features (like multiple clipboxes).  
But I suspect your real problem is you thought you did a copy to the 
clipboard from the DOS box, and you did not.

When you drag the mouse over the box, you *select* text, but do not copy 
it to the clipboard.  That doesn't happen till your right-click.

Then *another* right-click without anything selected will insert that 
new text into the command line.

Try the following on a DOS box (after enabling Quick Edit).  
Double-click on a "word".  Then right click *twice* to get it to the 
command line.




From pavlovevidence at gmail.com  Wed May  6 20:30:48 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 6 May 2009 17:30:48 -0700 (PDT)
Subject: Threading and GIL
References: <60538e1c-47ea-4120-bc91-a9dcebd8f14b@r34g2000vbi.googlegroups.com>
Message-ID: <a8f972ee-4594-493d-8b53-4a037c0211c0@n4g2000vba.googlegroups.com>

On May 6, 5:13?pm, googler.1.webmas... at spamgourmet.com wrote:
> Hi!
>
> I have a big problem I can't solve and I hope anyone of you can help
> me. I use the Python C API and in C++ I have a class which represets a
> thread object, similiar to the thread class of the known Python Thread
> class but with some needed additions so thats the reason why I have to
> built my own. Well, this is the problem.
>
> There is a method called Thread::End() which I can call in Python. But
> now the End() Function waits until the "Main" Function of my C++ class
> is done, but in this method I want to ensure the Global Interpreter
> Lock but this is already locked by the Thread which executes the End()
> command. So both is waiting and stops. The thread which calls the End
> () method is waiting for the finish of the Main() method of the Thread
> Class and the Main-Method in the other thread waits for the thread of
> the End() command that this is done - welcome Deadlock.
>
> Any suggestions what I have to do? Thank you veeery much for you help,
> otherwise I become really crazy here because this is the first time I
> have such a problem.
>
> Bye :)

You can try the PyGILState_Ensure and PyGILState_Release macros (see
PEP 311, http://www.python.org/dev/peps/pep-0311/ for more
information).

Make sure you have the GIL whenever you make any calls into Python
(with a couple exceptions) and make sure you DON'T have the GIL when
creating or deleting threads.  In fact, I can't think of any reason
why it wouldn't work to ensure a GIL state first thing after the
thread starts and to release it right before the thread ends.

Carl Banks


From lists at cheimes.de  Wed May  6 20:39:23 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 07 May 2009 02:39:23 +0200
Subject: Python 2.6 worth the hassle?
In-Reply-To: <4A020E6C.5020406@gmail.com>
References: <4A020E6C.5020406@gmail.com>
Message-ID: <gttajs$lp5$1@ger.gmane.org>

Evan Kroske schrieb:
> I'm planning on learning Python, and I'd like to know which version to
> start with. I know that Python 3.0 isn't ready for production and it
> doesn't have enough libraries yet, so I thought I should learn Python
> 2.6. Unfortunately, installing Python 2.6 on my Linux distro (Ubuntu
> Intrepid Ibex) has given me lots of complicated problems I really don't
> want to deal with.

It's rather easy to install Python 2.6 on Ubuntu 8.10 if you know how to
do it right:

# get all dependencies and necessary header files
sudo apt-get build-dep python2.5

# download and extract it
curl http://www.python.org/ftp/python/2.6.2/Python-2.6.2.tgz | tar -xzv

# Python is compiled with UCS 4 on all Debian systems
cd Python-2.6.2
./configure --enable-unicode=ucs4 --prefix=/usr/local

# compile it
make

# use altinstall so you don't overwrite the python command
# and just install the python2.6 command
sudo make altinstall

Now you have Python 2.6.2 in /usr/local

In order to remove it complete follow the instructions of my blog:
http://lipyrary.blogspot.com/2009/04/ubuntu-904-jaunty-and-python.html

Christian



From giuott at gmail.com  Wed May  6 20:39:32 2009
From: giuott at gmail.com (Giuseppe Ottaviano)
Date: Thu, 7 May 2009 02:39:32 +0200
Subject: [ANN] BPT (Boxed Package Tool) 0.3
Message-ID: <B3B33797-72A2-4C9A-B22C-1FDAB8256215@gmail.com>

Hi all,
I am happy to announce BPT 0.3

http://pypi.python.org/pypi/bpt

This release solves some important bugs, and the documentation has  
less TODOs.

Version 0.3
===========

- Improved documentation

- Fixed a bug that prevented the ``env`` script to be ``source``\'d
   (Works only with bash >= 3.0)

- Fixed a bug in the creation of symlinks that broken relocatability.

- ``env`` script does no more rely on GNU's ``readlink``, that is not
   present in vanilla OSX

- Other minor fixes

What is BPT
===========

BPT is a Python library (``bpt``) and a command line application
(``box``) to create and manage isolated enviroments, or *boxes*.

- Boxes are *relocatable*, which means that they can be moved to a
   different directory or even distributed to other machines (provided
   that the architecture is compatible).

- Packages inside the box can be easily disabled, enabled and removed,
   so that different versions of the same software can be installed
   simultaneously, allowing to switch between them.

- Boxes can be *nested*, in the sense that it is possible to activate
   a box environment while inside another box environment, so that all
   the packages installed in both boxes are available, and so on.

BPT is similar in some ways to `virtualenv
<http://pypi.python.org/pypi/virtualenv>`_, but it is not restricted
to Python packages, allowing to install virtually any Unix
software. It also takes some ideas from `jhbuild
<http://live.gnome.org/Jhbuild>`_, but without the dependency
resolution and automatic downloading machinery, and the ``bpt-rules``
format is inspired by `Gentoo <http://www.gentoo.org/>`_'s ebuilds.

Enjoy,
Giuseppe Ottaviano


From davea at ieee.org  Wed May  6 20:56:30 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 06 May 2009 20:56:30 -0400
Subject: Copy & Paste in a Dos box
In-Reply-To: <6640b734-80a7-4292-8223-7c00f5538261@r3g2000vbp.googlegroups.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<mailman.5154.1241632462.11746.python-list@python.org>	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>	<mailman.5167.1241642789.11746.python-list@python.org>	<82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>	<mailman.5182.1241651712.11746.python-list@python.org>
	<6640b734-80a7-4292-8223-7c00f5538261@r3g2000vbp.googlegroups.com>
Message-ID: <4A0231BE.50603@ieee.org>

Mensanator wrote:
> On May 6, 6:15 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>   
>> Mensanator wrote:
>>     
>>> On May 6, 3:46 pm, Dave Angel <da... at ieee.org> wrote:
>>>       
>>>> Mensanator wrote:
>>>>         
>>>>> <snip>
>>>>> And when prompted, do "(.) modify shortcut that started this window"
>>>>> After which, you can dispense with the menus (except when pasting),
>>>>> just select the text and hit <enter>.
>>>>>           
>>>> To paste into a DOS box, once Quick Edit is enabled, use Right-Click.  
>>>> They keystrokes will be sent to the command editor.  Note that the
>>>> interpretation is rather literal, so be careful if copy/pasting more
>>>> than one line, or a line that was wrapped.
>>>>         
>>> Well I'll be dipped. Didn't know you could do that.
>>>       
>>> Of course, since I learned how to call programs from the
>>> script and capture their StdOut, I don't have much call for
>>> cut/paste from dos windows. Hopefully, I'll remember that the
>>> next time I need it.
>>>       
>> That's new to me too!
>>
>> You probably already know that if you drag-and-drop a file onto the
>> window you get its path.
>>     
>
> Damn! I may just go back to using Python from the command prompt
> instead of using IDLE.
>
> On second thought, IDLE is way too useful for indenting, dedenting,
> commenting and uncommenting blocks of code. Can't go back to using
> Notepad.
>
>
>   
When I started with Python, I was using Metapad for editing.  Although 
it doesn't help with commenting-blocks, it's much better than Notepad 
for all purposes I used.

Then I discovered Komodo.  Although not cheap, it's a great IDE for my 
uses.  And there's a free version called Komodo-Edit, which is missing 
the debugger but otherwise may be quite useful.




From rhodri at wildebst.demon.co.uk  Wed May  6 20:59:02 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 07 May 2009 01:59:02 +0100
Subject: Self function
In-Reply-To: <1241649200.4a0210301f77e@mail.uh.cu>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
	<op.uti1kf0ga8ncjz@gnudebst> <1241649200.4a0210301f77e@mail.uh.cu>
Message-ID: <op.utjbooaya8ncjz@gnudebst>

On Wed, 06 May 2009 23:33:20 +0100, Luis Alberto Zarrabeitia Gomez  
<kyrie at uh.cu> wrote:

> Quoting Rhodri James <rhodri at wildebst.demon.co.uk>:
>> So the answer to my question would be "nothing"?
>
> Indeed, there is nothing broken with the search and replace feature of  
> his editor. When he is copying a non-recursive function, it is
> _useless_ to do a search and replace. When he is copying a recursive
> function, it is _required_ to do a search and replace.

On the contrary, it's merely not very useful for a non-recursive
function.  It still changes the function's name, which was one of the
objectives.  Seriously, the lack of effort in (say) doing a quick
incremental search for the function's name is a no-brainer.

> So, the very same task requires you to either perform a task that will  
> almost always be useless (or even dangerous), or to read the source code
> to find out if the function is recursive, so that you can use the search
> and replace only then.

If you're copying code without reading it, you're going to get bitten
anyway some time.  My sympathy is still limited.

> (I know that the "problem" is present in almost all programming  
> languages... but that's not what is being discussed. Bearophile's
> concerns seem legitimate, and you should not dismiss them so lightly
> just because there are ways to do more work and hopefully avoid the
> problems. I'd say that the "problem" is even aggravated in python,
> where the dynamic nature of the language makes it near to
> impossible to build good refactoring tools)

As with that other great "problem" of python, the lack of private
class attributes, a tiny amount of self-discipline solves 90% of the
issues.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From benjamin at python.org  Wed May  6 21:32:47 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Wed, 6 May 2009 20:32:47 -0500
Subject: [RELEASED] Python 3.1 beta 1
Message-ID: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com>

On behalf of the Python development team, I'm thrilled to announce the first and
only beta release of Python 3.1.

Python 3.1 focuses on the stabilization and optimization of features and changes
Python 3.0 introduced.  For example, the new I/O system has been rewritten in C
for speed.  File system APIs that use unicode strings now handle paths with
undecodable bytes in them. [1] Other features include an ordered dictionary
implementation and support for ttk Tile in Tkinter.  For a more extensive list
of changes in 3.1, see http://doc.python.org/dev/py3k/whatsnew/3.1.html or
Misc/NEWS in the Python distribution.

Please note that this is a beta release, and as such is not suitable for
production environments.  We continue to strive for a high degree of quality,
but there are still some known problems and the feature sets have not been
finalized.  This beta is being released to solicit feedback and hopefully
discover bugs, as well as allowing you to determine how changes in 3.1 might
impact you.  If you find things broken or incorrect, please submit a bug report
at

    http://bugs.python.org

For more information and downloadable distributions, see the Python 3.1 website:

    http://www.python.org/download/releases/3.1/

See PEP 375 for release schedule details:

    http://www.python.org/dev/peps/pep-0375/



Enjoy,
-- Benjamin

Benjamin Peterson
benjamin at python.org
Release Manager
(on behalf of the entire python-dev team and 3.1's contributors)


From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 21:34:18 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 01:34:18 GMT
Subject: Python 2.6 worth the hassle?
References: <mailman.5174.1241648774.11746.python-list@python.org>
Message-ID: <pan.2009.05.07.01.34.17@REMOVE.THIS.cybersource.com.au>

On Wed, 06 May 2009 18:25:48 -0400, Evan Kroske wrote:

> I'm planning on learning Python, and I'd like to know which version to
> start with. I know that Python 3.0 isn't ready for production and it
> doesn't have enough libraries yet, so I thought I should learn Python
> 2.6. Unfortunately, installing Python 2.6 on my Linux distro (Ubuntu
> Intrepid Ibex) has given me lots of complicated problems I really don't
> want to deal with.

What happens if you use the altinstall option and install from source?


> My essential question is "Is Python 2.6 similar enough to Python 3.0 to
> justify its complexity of installation?" Upgrading to Jaunty is NOT an
> option
> (http://welcome2obscurity.blogspot.com/2009/05/jaunty-jackalope-
released-vista-all.html).

Are you saying that Intrepid uses Python3.0 as it's default Python?

If not, then just use the default Python installed. Possibly Python 2.5. 
The differences between 2.5 and 2.6 are minor.


-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 21:35:12 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 01:35:12 GMT
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5109.1241543371.11746.python-list@python.org>
	<85d4am8hq4.fsf@agentultra.com>
Message-ID: <pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>

On Wed, 06 May 2009 09:48:51 -0400, J Kenneth King wrote:

> Emile van Sebille <emile at fenx.com> writes:
> 
>> On 5/5/2009 9:15 AM J Kenneth King said...
>>
>>> List comprehensions can make a reader of your code apprehensive
>>> because it can read like a run-on sentence and thus be difficult to
>>> parse. The Python documentation discourages their use and I believe
>>> for good reason.
>>
>> Can you provide a link for this?  I'd like to see specifically what's
>> being discouraged, as I'd be surprised to find routine usage frowned
>> upon.
>>
>> Emile
> 
> http://docs.python.org/tutorial/datastructures.html#nested-list-
comprehensions
> 
> 
> "If you?ve got the stomach for it, list comprehensions can be nested.
> They are a powerful tool but ? like all powerful tools ? they need to be
> used carefully, if at all."

How does this discourage the use of list comprehensions? At most, it 
warns that complicated list comps are tricky. Complicated *anything* are 
tricky.


> and
> 
> "In real world, you should prefer builtin functions to complex flow
> statements."

That's ridiculous. The example given is a special case. That's like 
saying "Loops are hard, so in the real world, if you want a loop, find a 
builtin function that does what you want instead."

What's the "builtin function" we're supposed to prefer over a "complex 
flow statement" like this?

# split text into word fragments of length <= 3
sentence = "a sentence is a series of words"
new = [word[i:i+3] for word in sentence.split() for i in range(0, len(word), 3)]



-- 
Steven


From legoandrew at schjelderup.org  Wed May  6 21:39:01 2009
From: legoandrew at schjelderup.org (Andrew Free)
Date: Wed, 6 May 2009 18:39:01 -0700
Subject: Tkinter Caesar Cipher GUI (speed errors?)
Message-ID: <3F213EA7-F667-4BAA-93EA-6D7205188FCB@schjelderup.org>

I have been told the mailing lists talk a lot about Tkinter and I have  
not been able to find anyone who knows the answer to this question.  
This is also the first time I have used the mailing lists, so hey  
guys :D.

I decided to work on a GUI for this because I need the practice.  
However I ran into this weird problem.
If I change line 67 from 1000 to 100 my program prints two of the last  
letter...http://pastebin.com/d656cfd09
(with 1000) http://www.grabup.com/uploads/9d477c68231951f4025a27090de798e1.png?direct
with (100) http://www.grabup.com/uploads/8adfdc83e9b5a2e9e7af1f557a97a3ee.png?direct

That just makes no sense at all. Is 100 to fast for it to run? I would  
think it would wait for it to finish and update the GUI before it  
moved on.

Thanks,

Andrew
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From lists at cheimes.de  Wed May  6 21:40:16 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 07 May 2009 03:40:16 +0200
Subject: Python 2.6 worth the hassle?
In-Reply-To: <pan.2009.05.07.01.34.17@REMOVE.THIS.cybersource.com.au>
References: <mailman.5174.1241648774.11746.python-list@python.org>
	<pan.2009.05.07.01.34.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <gtte60$sln$1@ger.gmane.org>

Steven D'Aprano wrote:
> Are you saying that Intrepid uses Python3.0 as it's default Python?
> 
> If not, then just use the default Python installed. Possibly Python 2.5. 
> The differences between 2.5 and 2.6 are minor.

Ubuntu 9.04 has Python 2.6.2 as default Python interpreter. It's also
shipped with Python 2.5. Python 2.4 and 3.0 are in its software list, too.

Christian



From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 21:48:28 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 01:48:28 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
	<op.uti1kf0ga8ncjz@gnudebst> <1241649200.4a0210301f77e@mail.uh.cu>
	<mailman.5189.1241657949.11746.python-list@python.org>
Message-ID: <pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>

On Thu, 07 May 2009 01:59:02 +0100, Rhodri James wrote:

> On Wed, 06 May 2009 23:33:20 +0100, Luis Alberto Zarrabeitia Gomez
> <kyrie at uh.cu> wrote:
> 
>> Quoting Rhodri James <rhodri at wildebst.demon.co.uk>:
>>> So the answer to my question would be "nothing"?
>>
>> Indeed, there is nothing broken with the search and replace feature of
>> his editor. When he is copying a non-recursive function, it is
>> _useless_ to do a search and replace. When he is copying a recursive
>> function, it is _required_ to do a search and replace.
> 
> On the contrary, it's merely not very useful for a non-recursive
> function.
[...]


Whether search and replace is "not very useful" or "not useful at all", 
it's still an inconvenience and a PITA. Calling up S&R to search through 
a six line function is ridiculously overkill, but if you don't do it, 
you'll surely be bitten.

But regardless, everyone is missing the most important point: why are you 
copying and pasting code in the first place? That is surely very close to 
the top of the list of Worst Ever Anti-Patterns, and it should be avoided 
whenever possible.

In Python, we can avoid much copy-and-paste coding with decorators. Given 
one function, we can create as many variants as we want, differing in pre-
processing of arguments and post-processing of results, by using 
decorators. This is a powerful ability to have, but it's crippled for 
many recursive functions, because recursive functions in Python don't 
actually call themselves, they call whatever happens to be bound to their 
name at runtime.

As Luis said, all(?) programming languages have this same weakness. Just 
because it's a weakness shared by all languages, doesn't stop it from 
being a weakness. My proposal will lesson (but not entirely eliminate) 
this weakness.



-- 
Steven


From Shawn at Milochik.com  Wed May  6 21:51:47 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 6 May 2009 21:51:47 -0400
Subject: Copy & Paste in a Dos box
In-Reply-To: <6640b734-80a7-4292-8223-7c00f5538261@r3g2000vbp.googlegroups.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<mailman.5154.1241632462.11746.python-list@python.org>
	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
	<mailman.5167.1241642789.11746.python-list@python.org>
	<82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>
	<mailman.5182.1241651712.11746.python-list@python.org>
	<6640b734-80a7-4292-8223-7c00f5538261@r3g2000vbp.googlegroups.com>
Message-ID: <2dc0c81b0905061851xbfb5ac3q403c51adbe510c46@mail.gmail.com>

<snip>
> Damn! I may just go back to using Python from the command prompt
> instead of using IDLE.
>
> On second thought, IDLE is way too useful for indenting, dedenting,
> commenting and uncommenting blocks of code. Can't go back to using
> Notepad.
>
<snip>


You might want to check out iPython, then -- it's an interactive
Python interpreter that's meant to be used as a shell environment. It
has very useful help and auto-completion features.

If you're just talking about an IDE, you might want to try TextMate if
you're on a Mac. It's great. Notepad++ is good on Windows, but I
haven't used it in Python much, so I don't know about its indentation
features.


From kyrie at uh.cu  Wed May  6 22:32:23 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Wed, 06 May 2009 22:32:23 -0400
Subject: Self function
In-Reply-To: <pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
	<op.uti1kf0ga8ncjz@gnudebst> <1241649200.4a0210301f77e@mail.uh.cu>
	<mailman.5189.1241657949.11746.python-list@python.org>
	<pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>
Message-ID: <1241663543.4a024837a9680@mail.uh.cu>


Quoting Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>:

> But regardless, everyone is missing the most important point: why are you 
> copying and pasting code in the first place? That is surely very close to 
> the top of the list of Worst Ever Anti-Patterns, and it should be avoided 
> whenever possible.

[btw, I took this long before jumping into this thread for this precise
reason... Copy/paste is an evil anti-pattern.

> In Python, we can avoid much copy-and-paste coding with decorators. Given 
> one function, we can create as many variants as we want, differing in pre-
> processing of arguments and post-processing of results, by using 
> decorators. This is a powerful ability to have, but it's crippled for 
> many recursive functions, because recursive functions in Python don't 
> actually call themselves, they call whatever happens to be bound to their 
> name at runtime.

A bit offtopic: a while ago I think I saw a recipe for a decorator that, via
bytecode hacks, would bind otherwise global names to the local namespace of the
function. Can anyone remember it/point me to it? An @bind decorator that would
'localize' all the global names, including the still unexistent but already know
function name, would guarantee that at least recursion calls the same function
instead of "whatever happens to be bound to their name at runtime". If it wasn't
a hack, anyway.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie


-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From georgeoliverGO at gmail.com  Wed May  6 22:38:41 2009
From: georgeoliverGO at gmail.com (George Oliver)
Date: Wed, 6 May 2009 19:38:41 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5117.1241549976.11746.python-list@python.org>
	<ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
	<42c18697-15ab-4813-8267-c416fae38642@p4g2000vba.googlegroups.com>
Message-ID: <bcb21279-e084-423a-98b3-3dc5bc0c2c8f@k9g2000pra.googlegroups.com>

On May 6, 3:07 pm, Carl Banks <pavlovevide... at gmail.com> wrote:

> I'm going to guess that you want the keyboardHandler to call method of
> commandHandler.  There's no reason for commandHandler to be a handler
> at all then: keyboardHandler is already handling it.


Thanks Carl, you've got it right and your following example is what I
ended up using, it's good to know it's a workable solution.


From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 22:41:29 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 02:41:29 GMT
Subject: Simple way of handling errors
References: <2009050616401916807-tomfsessile@gmailcom>
Message-ID: <pan.2009.05.07.02.41.28@REMOVE.THIS.cybersource.com.au>

On Wed, 06 May 2009 16:40:19 -0700, TomF wrote:

> As a relative newcomer to Python, I like it a lot but I'm dismayed at
> the difficulty of handling simple errors.  In Perl if you want to
> anticipate a file-not-found error you can simply do:
> 
> open($file)  or die("open($file): $!");
> 
> and you get an intelligible error message.  In Python, to get the same
> thing it appears you need at least:
> 
> try:
>     f=open(file)
> except IOError, err:
>     print "open(%s): got %s" % (file, err.strerror)
>     exit(-1)


Functions never fail silently in Python. (At least built-in functions 
never fail silently. Functions you write yourself can do anything you 
want.)


The canonical way of doing "open or die" in Python is to just call open:

f = open(filename)

If it fails, you get both a straight-forward error message and a useful 
traceback:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: [Errno 2] No such file or directory: 'foomanchu'

 
The only reason you would bother going to the time and effort of catching 
the error, printing your own error message, and then exiting, is if you 
explicitly want to hide the traceback from the user.

Oh, and if you do that, I recommend that you print to stderr instead of 
stdout:

    print >>sys.stderr, "open(%s): got %s" % (file, err.strerror)

or 

    sys.stderr.write("open(%s): got %s\n" % (file, err.strerror))



-- 
Steven


From jianchun.zhou at gmail.com  Wed May  6 22:49:33 2009
From: jianchun.zhou at gmail.com (Jianchun Zhou)
Date: Thu, 7 May 2009 10:49:33 +0800
Subject: Why there is a parameter named "self" for classmethod function?
Message-ID: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>

Hi, ALL:

I have a sample code as bellow:

#!/usr/bin/env python

class Hello:
    def __init__(self):
        print "Hello __init__"
    @classmethod
    def print_hello(self):
        print "hello"

Hello.print_hello()

If I move "self" parameter of print_hello away, this code fragment won't
work.

I am wondering when Hello.print_hello() executes, what value will "self" be
asigned?


-- 
Best Regards
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From clp2 at rebertia.com  Wed May  6 22:55:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 6 May 2009 19:55:57 -0700
Subject: Why there is a parameter named "self" for classmethod function?
In-Reply-To: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
Message-ID: <50697b2c0905061955s7bd16296lca71f98039e8f292@mail.gmail.com>

On Wed, May 6, 2009 at 7:49 PM, Jianchun Zhou <jianchun.zhou at gmail.com> wrote:
> Hi, ALL:
>
> I have a sample code as bellow:
>
> #!/usr/bin/env python
>
> class Hello:
> ??? def __init__(self):
> ??????? print "Hello __init__"
> ??? @classmethod
> ??? def print_hello(self):
> ??????? print "hello"
>
> Hello.print_hello()
>
> If I move "self" parameter of print_hello away, this code fragment won't
> work.
>
> I am wondering when Hello.print_hello() executes, what value will "self" be
> asigned?

The class itself will be the value of self (hence the "class" in
"classmethod") in that case. For this reason, the parameter is
conventionally called "cls" rather than "self", to avoid confusion.

Cheers,
Chris
-- 
http://blog.rebertia.com


From kurt at kbsymanzik.org  Wed May  6 23:01:44 2009
From: kurt at kbsymanzik.org (Kurt Symanzik)
Date: Thu, 07 May 2009 11:01:44 +0800
Subject: Why there is a parameter named "self" for classmethod function?
In-Reply-To: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
Message-ID: <4A024F18.9080407@kbsymanzik.org>

Jianchun Zhou <jianchun.zhou at gmail.com> wrote on 2009-05-07 10:49:33 AM 
+0800
> I have a sample code as bellow:
> 
> #!/usr/bin/env python
> 
> class Hello:
>     def __init__(self):
>         print "Hello __init__"
>     @classmethod
>     def print_hello(self):
>         print "hello"
> 
> Hello.print_hello()
> 
> If I move "self" parameter of print_hello away, this code fragment won't 
> work.
> 
> I am wondering when Hello.print_hello() executes, what value will "self" 
> be asigned?

The self variable above with be populated with a reference to the class, 
so it would be more appropriately named cls such as:

@classmethod
def print_hello(cls):
	print "hello"

But you might consider decorating the method as a static method instead 
since in your example you are not using the parameter at all.  A static 
method would not require a parameter.

@staticmethod
def print_hello():
	print "hello"

Kurt

-- 
Kurt Symanzik
kurt at kbsymanzik.org
Skype id: ksymanzik
http://kbsymanzik.org


From sjmachin at lexicon.net  Wed May  6 23:11:17 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 6 May 2009 20:11:17 -0700 (PDT)
Subject: Could this expression parser be more 'Pythonic'?
References: <e8f3a550-647b-4ce2-bae3-c160e42e5439@j12g2000vbl.googlegroups.com>
Message-ID: <b8f53ce0-1bd5-4eb9-a7dd-d9df2b8b5ed9@d19g2000prh.googlegroups.com>

On May 7, 9:23?am, Amr <amrbek... at gmail.com> wrote:
> Hello all,
>
> I've been spending the last few weeks learning Python, and I've just
> started to use it to write a simple BASIC compiler. I'm writing a
> mathematical expression parser and wrote a function that would take a
> string and split it into high level tokens.
>
> The code can be found athttp://pastebin.com/f757252ec(have a look at
> the function tokenize).

It's always a good idea to describe to yourself what you are actually
trying to achieve before you get too embrolied in the implementation
details.

Adding a few more tests like this:

if __name__ == '__main__':
    tests = """\
    1 + 2 * 3
    (1 + 2) * 3
    1 + (2 * 3)
    !@#$%^
    foo = bar + zot
    foo=bar+zot
    xyzzy(bar, zot + 2.34)
    """
    for test in tests.splitlines():
        test = test.strip()
        e = Expression(test)
        result = e.tokenize(e.expression)
        print "%r => %r" % (test, result)

produces this:
'1 + 2 * 3' => ['1', '+', '2', '*', '3']
'(1 + 2) * 3' => ['1 + 2', '*', '3']
'1 + (2 * 3)' => ['1', '+', '2 * 3']
'!@#$%^' => ['!@#$%^']
'foo = bar + zot' => ['foo', '=', 'bar', '+', 'zot']
'foo=bar+zot' => ['foo=bar', '+', 'zot']
'xyzzy(bar, zot + 2.34)' => ['xyzzy', 'bar, zot + 2.34']
'' => []

which indicates that your notions of what a token is and what you
might use them for must be rather "interesting".

Most other folks' tokenisers would have no concept of "bracket depth",
would not throw the parentheses away, and would return not only the
tokens but a classification as well e.g.

'xyzzy' ID
'(' LPAREN
'bar' ID
',' LISTSEP
'zot' ID
'+' OPER
'2.34' FLOAT_CONST
')' RPAREN


> I was interested to see if the tokenize function could be written in a
> better way, so as to make better use of the Python language and
> libraries. One thing that sprung to mind was whether it would be a
> good idea to perhaps take advantage of regular expressions. I had a
> look at a few compiler sites and regexps seem to come into that role
> quite a bit. I've only done a little work on regexps and they seem
> very powerful, but can easily get out of control!
>
> So, any suggestions as to how to make better use of the language
> writing something like this?

There are various packages like pyparsing, plex, ply, ... which are
all worth looking at. However if you want to get stuck into the
details, you can lash up a quick and dirty lexer (tokeniser) using
regexps in no time flat, e.g.

an ID is matched by r"[A-Za-z_][A-Za-z0-9_]*"
an INT_CONST is matched by r"[0-9]+"
an OPER is matched by r"[-+/*]"
etc
so you set up a (longish) re containing all the alternatives
surrounded by capturing parentheses and separated by "|".

r"([A-Za-z_][A-Za-z0-9_]*)|([0-9]+)|([-+/*])etc"

Hint: don't do it manually, use ")|(".join()

and you just step through your input string:
1. skip over any leading whitespace
2. look for a match of your re starting at current offset
3. matchobj.lastindex gives you 0 if it's an ID, 1 if it's an
INT_CONST, etc
4. save the slice that represents the token
5. adjust offset, loop around until you hit the end of the input

Hint: the order in which you list the alternatives can matter a lot
e.g. you better have "<=" before "<" otherwise it would regard "<=" as
comprising two tokens "<" and "="

HTH,
John


From apt.shansen at gmail.com  Wed May  6 23:19:56 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Wed, 6 May 2009 20:19:56 -0700
Subject: Simple way of handling errors
In-Reply-To: <pan.2009.05.07.02.41.28@REMOVE.THIS.cybersource.com.au>
References: <2009050616401916807-tomfsessile@gmailcom>
	<pan.2009.05.07.02.41.28@REMOVE.THIS.cybersource.com.au>
Message-ID: <7a9c25c20905062019m2d428612i1f23f221bf8b898@mail.gmail.com>

> If it fails, you get both a straight-forward error message and a useful
> traceback:
>
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> IOError: [Errno 2] No such file or directory: 'foomanchu'
>
>
> The only reason you would bother going to the time and effort of catching
> the error, printing your own error message, and then exiting, is if you
> explicitly want to hide the traceback from the user.
>

Unfortunately, I find that even halfway technically trained
(not necessarily naturally inclined or talented, but trained) users are
utterly unable to read tracebacks in real world situations. I had to put up
a rather big guide on how to read and interpret even the simplest ones
complete with color coding, "how to pick out a traceback visually", "what
line to focus your attention on (the last)", and "how trying to /read/ it
instead of immediately sending it to me as if it were an opaque symbol
containing secret knowledge only I can make sense of, generally saves you
time in debugging issues". I'm not talking about esoteric tracebacks either
resulting from real bugs and stuff. I'm talking about 'file not found'
'permission denied' IO/OS level ones that should give serious hints at
things people should check/diagnose themselves.

There's a serious, "oh my god, traceback, /eyes glazed over/" reaction all
around. Now these aren't unix people or command line people (except my
rote), but still.

I don't quite find printing out tracebacks to stdout or stderr ever
acceptable :( Especially if its an expected error condition (file not found
is a very good example of that).

I route all my tracebacks into log files for diagnosing later (people also
can not be relied upon to say anything but 'traceback' when they see one: so
storing it for later is vital. They read the first word and stop. The
thought of most-significant-information at the bottom is a difficult thing,
alas)

Anyways. ;-) That's just my experience.

As to the OP: try/except is how you do it in Python. There's no shorter or
easier way; exceptions are how Python handles failure-states (even
soft/expected errors quite often) and it does so pervasively (but not
universally).

--S
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From tomf.sessile at gmail.com  Wed May  6 23:21:38 2009
From: tomf.sessile at gmail.com (TomF)
Date: Wed, 6 May 2009 20:21:38 -0700
Subject: Simple way of handling errors
References: <2009050616401916807-tomfsessile@gmailcom>
	<pan.2009.05.07.02.41.28@REMOVE.THIS.cybersource.com.au>
Message-ID: <2009050620213875249-tomfsessile@gmailcom>

On 2009-05-06 19:41:29 -0700, Steven D'Aprano 
<steven at REMOVE.THIS.cybersource.com.au> said:

> On Wed, 06 May 2009 16:40:19 -0700, TomF wrote:
> 
>> As a relative newcomer to Python, I like it a lot but I'm dismayed at
>> the difficulty of handling simple errors.  In Perl if you want to
>> anticipate a file-not-found error you can simply do:
>> 
>> open($file)  or die("open($file): $!");
>> 
>> and you get an intelligible error message.  In Python, to get the same
>> thing it appears you need at least:
>> 
>> try:
>> f=open(file)
>> except IOError, err:
>> print "open(%s): got %s" % (file, err.strerror)
>> exit(-1)
> 
> 
> Functions never fail silently in Python. (At least built-in functions
> never fail silently. Functions you write yourself can do anything you
> want.)

Well, yes, I'm aware that if you don't handle errors Python barfs out a 
backtrace.

> If it fails, you get both a straight-forward error message and a useful
> traceback:
> 
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> IOError: [Errno 2] No such file or directory: 'foomanchu'
> 
> The only reason you would bother going to the time and effort of catching
> the error, printing your own error message, and then exiting, is if you
> explicitly want to hide the traceback from the user.

Well, to me, exposing the user to such raw backtraces is 
unprofessional, which is why I try to catch user-caused errors.  But I 
suppose I have an answer to my question.

Thanks,
-Tom



From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 23:38:22 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 03:38:22 GMT
Subject: Simple way of handling errors
References: <2009050616401916807-tomfsessile@gmailcom>
	<pan.2009.05.07.02.41.28@REMOVE.THIS.cybersource.com.au>
	<2009050620213875249-tomfsessile@gmailcom>
Message-ID: <pan.2009.05.07.03.38.21@REMOVE.THIS.cybersource.com.au>

On Wed, 06 May 2009 20:21:38 -0700, TomF wrote:

>> The only reason you would bother going to the time and effort of
>> catching the error, printing your own error message, and then exiting,
>> is if you explicitly want to hide the traceback from the user.
> 
> Well, to me, exposing the user to such raw backtraces is unprofessional,
> which is why I try to catch user-caused errors.  But I suppose I have an
> answer to my question.

That depends on your audience. Not every program is written to be used 
for a technical incompetent audience. Some users actually *want* to see 
the errors.

But certainly there are large classes of applications where you do want 
to suppress the traceback. That's why I said "if you explicitly want to 
hide the traceback from the user" rather than "don't do this".

The idiom I use is to wrap the *entire* application in a single 
try...except block, and then put all your user-friendly error handling in 
one place, instead of scattered over the entire application:


try:
    main(sys.argv[1:])
except KeyboardInterrupt, SystemExit:
    raise
except Exception, e:
    log(e)
    print >>sys.stderr, str(e)
    sys.exit(1)



Hope this helps.



-- 
Steven



From smiles at worksmail.net  Wed May  6 23:43:49 2009
From: smiles at worksmail.net (C or L Smith)
Date: Thu, 7 May 2009 09:28:49 +0545
Subject: Parsing text
Message-ID: <48E1A76D33C74BF888B381EB5E1F4E14@kisc.edu.np>

> Hi,
> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.
> 
> for scene in text.split('Scene'):
>     num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)
>     textNum = num.match(scene)
>     if textNum:
>         print textNum
>     else:
>         print "No scene number"
>     m = '<div type="scene>'
>     m += scene
>     m += '<\div>'
>     print m
> 
> Thanks, Iain
> 

Don't forget that when you split the text, the first piece you get is what came *before* the thing you split on so there won't be a scene number in the first piece.

###
>>> print 'this foo 1 and that foo 2 and the end'.split('foo')
['this ', ' 1 and that ', ' 2 and the end']
###

If you have material before the first occurrence of the word 'Scene' you will want to print that out without decoration.

Also, it looks like you are trying to say with your regex that the scene number will come after some space and be a digit followed by a roman numeral of some kind(?). If the number looks like this 1iii or 2iv or then you could split your text with a regex rather than split:

###
>>> scene=re.compile('Scene\s+([0-9iIvV]+)')
>>> scene.split('The front matter Scene 1i The beginning was the best. Scene  1ii And then came the next act.')
['The front matter ', '1i', ' The beginning was the best. ', '1ii', ' And then came the next act.']
>>> 
###

The \s+ indicates that there will be at least one space character and maybe more; the human error factor predicts that you will use more than one space after the word scene, so \s+ just allows for that possibility.

The 0-9iIvV indicate the possible characters that might be part of your scene number. Since it's unlikely that you will have any word appearing after Scene that matches that pattern, it isn't written to be exact in specifying what should come next. [1] The parenthesis tell what (beside the pieces left by removing the split target) should be presented. In this case, the parenthesis were put around the pattern that (maybe) represented your scene number and so those are interspersed with the list of pieces.

/chris

[1] If it were more precise it might be '([1-9][0-9]*(iv|v?i{0,3}))' which recognizes that a number should start with 1 or above and perhaps be followed by 0 or more digits (including 0) and then come the roman numeral possibilities (for up to viii) [2].  That "|" indicates "or" and the parenthesis go around the roman numeral part to indicate that the "or" doesn't extend back to the decimal digits. That extra set of parenthesis also means that the split will now contain TWO captured pieces between each piece of script. If you put a ? after the scene number part meaning that it may or may not be there, None will be returned for the patterns that are not there:

###
>>> scene=re.compile('Scene\s+([1-9][0-9]*(iv|v?i{0,3}))?')
>>> scene.split('The front matter Scene 1i The beginning was the best. Scene  1ii And then came the next act. Scene The last one has no number.')
['The front matter ', '1i', 'i', ' The beginning was the best. ', '1ii', 'ii', ' And then came the next act. ', None, None, 'The last one has no number.']
>>> 
###

[2] http://diveintopython.org/regular_expressions/roman_numerals.html


From pierregmcode at gmail.com  Wed May  6 23:51:35 2009
From: pierregmcode at gmail.com (Pierre GM)
Date: Wed, 6 May 2009 20:51:35 -0700 (PDT)
Subject: Logging exceptions to a file
Message-ID: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>

All,
I need to log messages to both the console and a given file. I use the
following code (on Python 2.5)

>>> import logging
>>> #
>>> logging.basicConfig(level=logging.DEBUG,)
>>> logfile = logging.FileHandler('log.log')
>>> logfile.setLevel(level=logging.INFO)
>>> logging.getLogger('').addHandler(logfile)
>>> #
>>> mylogger = logging.getLogger('mylogger')
>>> #
>>> mylogger.info("an info message")

So far so good, but I'd like to record (possibly unhandled) exceptions
in the logfile.
* Do I need to explicitly trap every single exception ?
* In that case, won't I get 2 log messages on the console (as
illustrated in the code below:
>>> try:
>>>     1/0
>>> except ZeroDivisionError:
>>>     mylogger.exception(":(")
>>>     raise

Any comments/idea welcomed
Cheers.



From ross.jett at gmail.com  Thu May  7 00:02:47 2009
From: ross.jett at gmail.com (Ross)
Date: Wed, 6 May 2009 21:02:47 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>
Message-ID: <51631d39-ad19-4081-8e71-787cd565f252@s20g2000vbp.googlegroups.com>

On May 6, 3:14?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 6, 3:29?am, MRAB <goo... at mrabarnett.plus.com> wrote:
>
> > I have the feeling that if the number of rounds is restricted then the
> > difference between the minimum and maximum number of byes could be 2
> > because of the requirement that players shouldn't play each other more
> > than once, meaning that the players have to be shuffled around a bit, so
> > a player might play a week earlier or later than would otherwise be the
> > case.
>
> This is the feeling that I am getting also. ?All my efforts to keep
> everything as balanced as possible at all times (to be ready for the
> "season" to end suddenly at any time) result in messy jams that could
> otherwise be alleviated if I allowed temporary imbalances, knowing
> that there are more weeks later to make them up.
>
> John

If I were to set up a dictionary that counted players used in the bye
list and only allowed players to be added to the bye list if they were
within 2 of the least used player, would this be a good approach for
managing bye selection or would using a dictionary in this manner be
unnecessary/redundant?


From ross.jett at gmail.com  Thu May  7 00:30:12 2009
From: ross.jett at gmail.com (Ross)
Date: Wed, 6 May 2009 21:30:12 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>
Message-ID: <1e781afa-598d-41e6-941f-76b7f8ca2a32@21g2000vbk.googlegroups.com>

On May 6, 3:14?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 6, 3:29?am, MRAB <goo... at mrabarnett.plus.com> wrote:
>
> > I have the feeling that if the number of rounds is restricted then the
> > difference between the minimum and maximum number of byes could be 2
> > because of the requirement that players shouldn't play each other more
> > than once, meaning that the players have to be shuffled around a bit, so
> > a player might play a week earlier or later than would otherwise be the
> > case.
>
> This is the feeling that I am getting also. ?All my efforts to keep
> everything as balanced as possible at all times (to be ready for the
> "season" to end suddenly at any time) result in messy jams that could
> otherwise be alleviated if I allowed temporary imbalances, knowing
> that there are more weeks later to make them up.
>
> John

If I were to set up a dictionary that counted players used in the bye
list and only allowed players to be added to the bye list if they were
within 2 of the least used player, would this be a good approach for
managing bye selection or would using a dictionary in this manner be
unnecessary/redundant?


From ross.jett at gmail.com  Thu May  7 00:30:26 2009
From: ross.jett at gmail.com (Ross)
Date: Wed, 6 May 2009 21:30:26 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>
Message-ID: <1d8802ff-8211-467f-95c1-4616e3bd7300@s20g2000vbp.googlegroups.com>

On May 6, 3:14?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 6, 3:29?am, MRAB <goo... at mrabarnett.plus.com> wrote:
>
> > I have the feeling that if the number of rounds is restricted then the
> > difference between the minimum and maximum number of byes could be 2
> > because of the requirement that players shouldn't play each other more
> > than once, meaning that the players have to be shuffled around a bit, so
> > a player might play a week earlier or later than would otherwise be the
> > case.
>
> This is the feeling that I am getting also. ?All my efforts to keep
> everything as balanced as possible at all times (to be ready for the
> "season" to end suddenly at any time) result in messy jams that could
> otherwise be alleviated if I allowed temporary imbalances, knowing
> that there are more weeks later to make them up.
>
> John

If I were to set up a dictionary that counted players used in the bye
list and only allowed players to be added to the bye list if they were
within 2 of the least used player, would this be a good approach for
managing bye selection or would using a dictionary in this manner be
unnecessary/redundant?


From tjreedy at udel.edu  Thu May  7 00:33:26 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 00:33:26 -0400
Subject: Self function
In-Reply-To: <pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>	<m2iqkhnzxy.fsf@googlemail.com>	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>	<mailman.5072.1241474108.11746.python-list@python.org>	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>	<op.uthious2a8ncjz@gnudebst>	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>	<op.uti1kf0ga8ncjz@gnudebst>
	<1241649200.4a0210301f77e@mail.uh.cu>	<mailman.5189.1241657949.11746.python-list@python.org>
	<pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>
Message-ID: <gttoan$fm4$1@ger.gmane.org>

Steven D'Aprano wrote:

I am writing a book (with Python package) on algorithms that has *lots* 
of recursive functions.  I have also discovered that changing names can 
be a pain.  So in the text, (but not code) I have tried the equivalent of

# real_name
def f(params):
   ... f(args)

(This also keeps lines short enough for side-by-side versions, when I 
want to do that.)

> But regardless, everyone is missing the most important point: why are you 
> copying and pasting code in the first place?

In my case, I will be discussing variations of algorithms.  Copy and 
edit minimizes fatigue and errors and maximizes parallelism.

  That is surely very close to
> the top of the list of Worst Ever Anti-Patterns, and it should be avoided 
> whenever possible.

Not if the alternative is re-typing ;-).

> In Python, we can avoid much copy-and-paste coding with decorators.

But not when the variation is in the guts of the code.

 > because recursive functions in Python don't actually call themselves, 
 > they call whatever happens to be bound to their name at runtime.

I have mentioned that.  Also, apparently non-recursive functions can 
become recursive after the fact by being bound to another name used in 
the function.

tjr



From tjreedy at udel.edu  Thu May  7 00:39:28 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 00:39:28 -0400
Subject: Why there is a parameter named "self" for classmethod function?
In-Reply-To: <4A024F18.9080407@kbsymanzik.org>
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
	<4A024F18.9080407@kbsymanzik.org>
Message-ID: <gttom1$gbf$1@ger.gmane.org>

Kurt Symanzik wrote:

> 
> But you might consider decorating the method as a static method instead 
> since in your example you are not using the parameter at all.  A static 
> method would not require a parameter.
> 
> @staticmethod
> def print_hello():
>     print "hello"

Functions that refer to neither the class nor an instance thereof can 
usually be moved outside the class altogether.  Python is not Java.  I 
believe staticmethod() was mainly added because it is needed for 
.__new__(), at least in some appearances.

tjr



From gallium.arsenide at gmail.com  Thu May  7 01:11:04 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Wed, 6 May 2009 22:11:04 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>
	<1d8802ff-8211-467f-95c1-4616e3bd7300@s20g2000vbp.googlegroups.com>
Message-ID: <b2cf45ed-d3da-4d93-883c-c8985d40ad55@r34g2000vba.googlegroups.com>

On May 7, 12:30?am, Ross <ross.j... at gmail.com> wrote:
>
> If I were to set up a dictionary that counted players used in the bye
> list and only allowed players to be added to the bye list if they were
> within 2 of the least used player, would this be a good approach for
> managing bye selection or would using a dictionary in this manner be
> unnecessary/redundant?

I certainly have not proved it, but I think you don't need to resort
to anything fancy if you are OK with the maximum byes being within two
of the minimum byes.  (Maybe this needs to be larger with larger
numbers of players.)  Try using your original shuffle but instead of
selecting matches to "throw away" each week, just use the matches you
need (to fill up the courts) and pick up where you left off the next
week.  For example, with 10 players, each "round" ideally consists of
five matches.  If you only have four courts, don't throw away the
fifth match; save it as the first match next week.

To be honest, I didn't look too carefully at your original shuffle.
It may be good enough.  It's a little different than the "standard"
rotation as presented on Wikipedia:

  http://en.wikipedia.org/wiki/Round-robin_tournament#Scheduling_algorithm

The one on Wikipedia happened to pass my casual tests with no more
than a 2-bye difference between the most-played and least-played
players, and didn't run into the problem of scheduling the same player
for two matches the same week.  But I have to stress I only tried a
few starting values, which all worked; I didn't try to break it, or
run an extensive battery of tests.

John


From ganesh.gbg at gmail.com  Thu May  7 01:17:17 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Wed, 6 May 2009 22:17:17 -0700 (PDT)
Subject: problem in using sendmail in multi thread
References: <mailman.5150.1241619049.11746.python-list@python.org>
Message-ID: <8254344f-a31e-489a-9adc-7f0eee9915e2@g31g2000pra.googlegroups.com>

On May 6, 7:10?pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
> On Tue, 5 May 2009 22:17:35 -0700 (PDT), gganesh <ganesh.... at gmail.com> wrote:
> >On May 5, 9:25?pm, Piet van Oostrum <p... at cs.uu.nl> wrote:
> >> >>>>> gganesh <ganesh.... at gmail.com> (g) wrote:
> >> >g> hi,
> >> >g> I'm a beginner in using Python script
> >> >g> I'm trying to send mails using multi-thread
> >> >g> I wrote
> >> >g> FROM = 'ganeshx... at xxxx.com'
> >> >g> # for more mail add';' the another mail id
> >> >g> listTo = ['g.... at gmail.com', 'xxjango... at gmail.com',
> >> >g> 'xx... at yahoo.co.in']
> >> >g> SUBJECT = 'This is the subject'
> >> >g> MSGBODY = 'This the body of the message '
> >> >g> MAILSERVER = 'mail.xxxx.com'
> >> >g> port = 25
> >> >g> username = 'xxxxx'
> >> >g> password = 'xxxxx'
> >> >g> # trim the strings of any leading or trailing spaces
> >> >g> FROM = FROM.strip()
> >> >g> SUBJECT = SUBJECT.strip()
> >> >g> MSGBODY = MSGBODY.strip()
> >> >g> MAILSERVER = MAILSERVER.strip()
> >> >g> username = username.strip()
> >> >g> password = password.strip()
> >> >g> #Connect to server
> >> >g> print 'Connecting to mail server ', MAILSERVER
> >> >g> try:
> >> >g> ? ? ? s = smtplib.SMTP(MAILSERVER,port)
>
> >> You can't have a single SMTP connection that's used in multiple threads.
> >> That is what causes the error. Each thread should have its own SMTP
> >> connection. So move this code (above and below) into the run() method.
>
> >> >g> ? ? ? print 'connected'
> >> >g> #s.set_debuglevel(1)
> >> >g> except:
> >> >g> ? ? ? ?print 'ERROR: Unable to connect to mail server', sys.exc_info ?()[0]
> >> >g> ? ? ? ?sys.exit(1)
> >> >g> #login to server
> >> >g> if password <> '':
> >> >g> ? ? ? print 'Logging into mail server'
>
> >> I think this try except block should be inside the if statement, i.e.
> >> indented 4 spaces.
>
> >> >g> try:
> >> >g> ? ? ? s.login(username,password)
> >> >g> except:
> >> >g> ? ? ? print 'ERROR: Unable to login to mail server', MAILSERVER
> >> >g> ? ? ? print 'Please recheck your password'
> >> >g> ? ? ? sys.exit(1)
> >> >g> #--------------------------------------------------
> >> >g> print "Starting Multi Thread Method"
> >> >g> class MyThread(Thread):
> >> >g> ? ? def __init__(self, site, s, FROM, MSGBODY):
> >> >g> ? ? ? ? Thread.__init__(self)
> >> >g> ? ? ? ? self.site = site
> >> >g> ? ? ? self.s=s
> >> >g> ? ? ? self.FROM=FROM
> >> >g> ? ? ? self.MSGBODY=MSGBODY
>
> >> You give the s (connection) here as a parameter, store it in self.s and
> >> never use that attribute.
>
> >> >g> ? ? def run(self):
> >> >g> ? ? ? print "running for %s " %self.site
> >> >g> ? ? ? s.sendmail(self.FROM, self.site, self.MSGBODY)
>
> >> Here you use the global s, not self.s
>
> >> As I said above you should do the SMTP connection setup, including the
> >> login, here, and store the connection either in self.s or in a local
> >> variable s in the method. As you don't use the s in another method, I
> >> think a local variable is better.
>
> >> >g> ? ? ? print "Emailed for ?site %s" %self.site
> >> >g> a= time.time()
> >> >g> threads = []
> >> >g> for site in listTo:
> >> >g> ? ? T = MyThread(site,s,FROM,MSGBODY)
> >> >g> ? ? threads.append(T)
> >> >g> ? ? T.start()
> >> >g> for i in threads:
> >> >g> ? ? i.join()
>
> >> Of course the next 2 lines should also be moved to run().
>
> >> >g> s.quit()
> >> >g> s.close()
> >> >g> print "Took %s seconds" %str(time.time()-a)
> >> >g> #-----------------------------------------------------
>
> >> --
> >> Piet van Oostrum <p... at cs.uu.nl>
> >> URL:http://pietvanoostrum.com[PGP8DAE142BE17999C4]
> >> Private email: p... at vanoostrum.org
>
> >Thanks Everyone By your guidance the code worked fine
> >I can send mails in multi threaded environment.
> >Is this only way to send mails concurrently ?or any other method
> >aviable?
>
> Here's another way:
>
> ? ? from twisted.mail.smtp import sendmail
> ? ? from twisted.internet import reactor
> ? ? from twisted.python.log import err
>
> ? ? MAILSERVER = ...
> ? ? listTo = [...]
> ? ? FROM = ...
> ? ? MSGBODY = ...
>
> ? ? done = sendmail(MAILSERVER, FROM, listTo, MSGBODY)
> ? ? done.addErrback(err)
> ? ? done.addCallback(lambda ignored: reactor.stop())
> ? ? reactor.run()
>
> Jean-Paul

Hi Jean-Paul
This is what I'm searching for ,Thanks a lot
Based on your posting I wrote a programme,but it showed me a error
like

"Failure: twisted.mail.smtp.SMTPDeliveryError: 554 No recipients
accepted"
and
"Relay access denied" errors

I can clearly figure out, that this error is because, i haven't
authenticated my email account to send mail.
I have username and password of smpt server ,how to authenticate in
Twisted Framework


From sasurve at gmail.com  Thu May  7 02:06:44 2009
From: sasurve at gmail.com (shruti surve)
Date: Thu, 7 May 2009 11:36:44 +0530
Subject: About Odfpy links
Message-ID: <862e00220905062306q6b7519e3h3a1ece11c8dd9462@mail.gmail.com>

hey all,
 For my project, i am using ODFpy open office spreadsheets. I am creating
ledgers in python ie.ledger.py.  So when i run ledger.py, spreadsheet will
be opened in open office. since ledger is made of number of accounts, i am
creating multiple tables for all accounts in single spreadsheet. So, there
are number of tables in one spreadsheet.  Now i want create links in each
table of spreadsheet so that i can connect multiple tables. SO can anyone
please tell me how to create links in odfpy..
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From steven at REMOVE.THIS.cybersource.com.au  Thu May  7 02:29:57 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 06:29:57 GMT
Subject: Why there is a parameter named "self" for classmethod function?
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
	<4A024F18.9080407@kbsymanzik.org>
	<mailman.5206.1241671190.11746.python-list@python.org>
Message-ID: <pan.2009.05.07.06.29.56@REMOVE.THIS.cybersource.com.au>

On Thu, 07 May 2009 00:39:28 -0400, Terry Reedy wrote:

> Functions that refer to neither the class nor an instance thereof can
> usually be moved outside the class altogether.  Python is not Java.  I
> believe staticmethod() was mainly added because it is needed for
> .__new__(), at least in some appearances.


Can be, but if there's reason enough to keep it with a class, there's no 
reason not to. Sometimes I have a class with a few methods that share 
common code, but that code happens to not include self (or cls). Since 
the common code is only of interest to that class, even though it doesn't 
need the instance, I factor the common code out into a method.

This would be a good candidate for a staticmethod, only due to laziness I 
don't usually bother :)


-- 
Steven


From ldo at geek-central.gen.new_zealand  Thu May  7 02:43:02 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 07 May 2009 18:43:02 +1200
Subject: Logging exceptions to a file
References: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>
Message-ID: <gttvtn$nu4$4@lust.ihug.co.nz>

In message <597627b8-
d30b-4b74-9202-9cd46fb1d129 at s28g2000vbp.googlegroups.com>, Pierre GM wrote:

> ... I'd like to record (possibly unhandled) exceptions in the logfile.

    python myscript.py 2>error.log




From sasurve at gmail.com  Thu May  7 02:46:26 2009
From: sasurve at gmail.com (shruti surve)
Date: Thu, 7 May 2009 12:16:26 +0530
Subject: Python-list Digest, Vol 68, Issue 79
In-Reply-To: <mailman.18307.1241652495.11745.python-list@python.org>
References: <mailman.18307.1241652495.11745.python-list@python.org>
Message-ID: <862e00220905062346te99fe1bk320fd5bd43c37fcb@mail.gmail.com>

>
>
>   3. Re: About ODFPY links (Terry Reedy)
>
>
>
>
>
>
> ---------- Forwarded message ----------
> From: Terry Reedy <tjreedy at udel.edu>
> To: python-list at python.org
> Date: Wed, 06 May 2009 19:02:59 -0400
> Subject: Re: About ODFPY links
> shruti surve wrote:
>
>> hey all,
>>  For my project, i am using ODFpy open office spreadsheets. I am creating
>> ledgers in python ie.ledger.py <http://ie.ledger.py>.  So when i run
>> ledger.py, spreadsheet will be opened in open office. since ledger is made
>> of number of accounts, i am creating multiple tables for all accounts in
>> single spreadsheet. So, there are number of tables in one spreadsheet.  Now
>> i want create links in each table of spreadsheet so that i can connect
>> multiple tables. SO can anyone please tell me how to create links in odfpy..
>>
>
> The general answer to such questions is to make a minimal doc in some ODF
> application such of OOo that has the desired feature, save, open the doc as
> a zip file (unless saved as xml) and extract the pieces as xml. Then find
> the text that represents that feature.  There is a close correspondance
> between the xml and the internal document object model created by odfpy (and
> OOo, etc).
>
> In your case, make a spreadsheet with two table.  Give one one literal
> entry.  Give the other one entry that links to the first.  Then look in the
> xml to see how links are presented.  That should give a hint as to how to do
> the same in odfpy.  Then try to recreate the minimal doc with odfpy and look
> at the xml *it* produces.  If it looks similar enough, open with OOo to see
> what you get.
>
> tjr



hi
 i have tried that and i found <text:p><text:a xlink:href="#Sheet2"
office:target-frame-name="_self">Investments</text:a></text:p>...so in my
ledger.py i have written:

            para = P(text=lst_debit[i][0])


lan=A(href=lst_debit[i][0],targetframename="_self",text=lst_debit[i][0])

            lan.addElement(para)
            tc.addElement(lan)

            tr.addElement(tc)
(where lst_debit[i][0] is my account name coming from database)

 but still its not coming erroris :
in addElement
odf.element.IllegalChild: <text:p> is not allowed in <text:a>


i have tried it with:

tc.addElement(P(text=lst_credit[i][0]),A(href=lst_debit[i][0],targetframename="_self"))

but still its not coming, it is not giving any error, but not creating link,
giving simple text field.. so i basically i am not getting how to manage P
and A properties of cell together

Regards
shruti surve
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From OldGrantonian at googlemail.com  Thu May  7 03:03:11 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Thu, 7 May 2009 00:03:11 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
Message-ID: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>

I have Windows Vista Home Premium.

As a non-techy, I want to use "virtualenv"

I had Python 2.6 on my laptop.

I needed "easyinstall" to install virtualenv. During installation of
easyinstall, I got the message "Python 2.5 not found"

So I installed Python 2.5, then installed virtualenv

So I now have c:\Python 2.5 and c:\Python 2.6

On the virtualenv web site, the instructions for use are:

$ python virtualenv.py ENV

My question is, which "python" should I use on this command line: 2.5
or 2.6?

BTW: I am currently running a Python app using 2.6. I want to install
a beta upagrade of this app, without interfering with my current
setup, so the app developer recommends using virtualenv.


From googler.1.webmaster at spamgourmet.com  Thu May  7 03:20:09 2009
From: googler.1.webmaster at spamgourmet.com (googler.1.webmaster at spamgourmet.com)
Date: Thu, 7 May 2009 00:20:09 -0700 (PDT)
Subject: Threading and GIL
References: <60538e1c-47ea-4120-bc91-a9dcebd8f14b@r34g2000vbi.googlegroups.com>
	<a8f972ee-4594-493d-8b53-4a037c0211c0@n4g2000vba.googlegroups.com>
Message-ID: <e352ad10-c812-4218-a7db-bc5a6aeef2d4@e23g2000vbe.googlegroups.com>

Hi,

thats the reason why its not working. Imagine the end() method of the
thread object is called so the C++ Function is opened where the code
for this method is in.

At a line the Code ...->End() is called which waits that the C++
Thread class
is finished. BUT here is the problem: In the Method of the C++ class
which is in threaded mode can't run because its still waiting that the
GIL
is released by the thread which executed the ->End() command.

So the app has a deadlock when it arrives at       ->End() and
PyGILState_Ensure
function.


From fetchinson at googlemail.com  Thu May  7 03:29:29 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Thu, 7 May 2009 00:29:29 -0700
Subject: [Python-Dev] [RELEASED] Python 3.1 beta 1
In-Reply-To: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com>
References: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com>
Message-ID: <fbe2e2100905070029o75687a0eq114808139838be08@mail.gmail.com>

> On behalf of the Python development team, I'm thrilled to announce the first
> and
> only beta release of Python 3.1.
..............
> Other features include an ordered dictionary implementation

Are there plans for backporting this to python 2.x just as
multiprocessing has been?

I know that there are several ordered dictionary implementations for
2.x but they are all a little bit different from the one going into
3.1, hence my question.

Cheers,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From Lacrima.Maxim at gmail.com  Thu May  7 03:34:52 2009
From: Lacrima.Maxim at gmail.com (Lacrima)
Date: Thu, 7 May 2009 00:34:52 -0700 (PDT)
Subject: Checking for required arguments when instantiating class.
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
	<m21vr2mnac.fsf@cs.uu.nl>
	<mailman.5149.1241613418.11746.python-list@python.org>
Message-ID: <7c9defb8-9b4a-4062-a79f-ff6683c6c9f6@m24g2000vbp.googlegroups.com>

On May 6, 3:36?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Wed, May 6, 2009 at 5:24 AM, Piet van Oostrum <p... at cs.uu.nl> wrote:
>
>
>
> >>>>>> Lacrima <Lacrima.Ma... at gmail.com> (L) wrote:
>
> >>L> Hello!
> >>L> For example I have two classes:
>
> >>>>>> class First:
> >>L> ? ? def __init__(self, *args, **kwargs):
> >>L> ? ? ? ? ? ? pass
>
> >>>>>> class Second:
> >>L> ? ? def __init__(self, somearg, *args, **kwargs):
> >>L> ? ? ? ? ? ? self.somearg = somearg
>
> >>L> How can I test that First class takes 1 required argument and Second
> >>L> class takes no required arguments?
> >>L> So that I could instantiate them in a for loop.
>
> >>>>>> a = [First, Second]
> >>>>>> for cls in a:
> >>L> ? ? instance = cls()
>
> >>L> Traceback (most recent call last):
> >>L> ? File "<pyshell#22>", line 2, in <module>
> >>L> ? ? instance = cls()
> >>L> TypeError: __init__() takes at least 2 arguments (1 given)
>
> >>L> Of course, I can do like this:
> >>>>>> for cls in a:
> >>L> ? ? try:
> >>L> ? ? ? ? ? ? instance = cls()
> >>L> ? ? except TypeError:
> >>L> ? ? ? ? ? ? instance = cls('hello')
>
> >>>>>> print instance.somearg
> >>L> hello
>
> >>L> But what if I have to instantiate any class with 3 or 4 required
> >>L> arguments? How can I do it?
>
> > cls.__init__.im_func.__code__.co_argcount
>
> > This will include self, so it will be 1 in First and 2 in Second.
>
> AFAICT, that would count non-required arguments too, which isn't
> strictly what the OP requested.
>
> > However this is very dirty trickery and should not be recommended. It
> > may also change in future versions and other implementations of Python.
>
> Very much agreed.
>
> > I think it would be cleaner to put a class attribute in the classes that
> > defines how they should be initialized (e.g. just the number of required
> > arguments or more specific information) or have a special factory method
> > for this use case.
>
> Seconded. I'd recommend the latter personally, though it's impossible
> to give a definitive answer without more context.
>
> Cheers,
> Chris
> --http://blog.rebertia.com

Thanks for all of you!

I think I'll try to write a special method for this case and will
report you result.

-Max


From steven at REMOVE.THIS.cybersource.com.au  Thu May  7 03:46:06 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 07:46:06 GMT
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
Message-ID: <pan.2009.05.07.07.46.05@REMOVE.THIS.cybersource.com.au>

On Thu, 07 May 2009 00:03:11 -0700, OldGrantonian wrote:

> So I now have c:\Python 2.5 and c:\Python 2.6
> 
> On the virtualenv web site, the instructions for use are:
> 
> $ python virtualenv.py ENV
> 
> My question is, which "python" should I use on this command line: 2.5 or
> 2.6?

I'm not an expert on virtualenv, nor do I use Windows, but I'd start off 
with this:

$ c:\Python 2.5\python.exe vitualenv.py ENV


and if that doesn't do what you expect, report the precise error you get 
and hopefully somebody who knows more about Windows can help.




-- 
Steven


From __peter__ at web.de  Thu May  7 04:01:57 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 07 May 2009 10:01:57 +0200
Subject: Simple way of handling errors
References: <2009050616401916807-tomfsessile@gmailcom>
Message-ID: <gtu4hj$ll7$00$1@news.t-online.com>

TomF wrote:

> As a relative newcomer to Python, I like it a lot but I'm dismayed at
> the difficulty of handling simple errors.  In Perl if you want to
> anticipate a file-not-found error you can simply do:
> 
> open($file)  or die("open($file): $!");
> 
> and you get an intelligible error message.  In Python, to get the same
> thing it appears you need at least:
> 
> try:
>     f=open(file)
> except IOError, err:
>     print "open(%s): got %s" % (file, err.strerror)
>     exit(-1)
> 
> Is there a simpler interface or idiom for handling such errors?  I
> appreciate that Python's exception handling is much more sophisticated
> but often I don't need it.
> 
> -Tom

While you are making the transition you could write

from perl_idioms import open_or_die

f = open_or_die("does-not-exist")


with the perl_idioms module looking like

import sys

def open_or_die(*args):
    try:
        return open(*args)
    except IOError, e:
        sys.exit(e)

Peter



From r-w at inet.net.au  Thu May  7 04:41:04 2009
From: r-w at inet.net.au (r-w)
Date: Thu, 07 May 2009 18:41:04 +1000
Subject: idea
Message-ID: <4A029EA0.3030403@inet.net.au>

Redirect sys.stderr to the log file in ANUGA logging.
This might catch unexpected exceptions.


From lie.1296 at gmail.com  Thu May  7 05:08:17 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 07 May 2009 09:08:17 GMT
Subject: list comprehension question
In-Reply-To: <pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>	<85ocucnbce.fsf@agentultra.com>	<mailman.4923.1241193638.11746.python-list@python.org>	<85ljpb8r1o.fsf@agentultra.com>	<mailman.5109.1241543371.11746.python-list@python.org>	<85d4am8hq4.fsf@agentultra.com>
	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
Message-ID: <5yxMl.9285$y61.6301@news-server.bigpond.net.au>

Steven D'Aprano wrote:
>> "If you?ve got the stomach for it, list comprehensions can be nested.
>> They are a powerful tool but ? like all powerful tools ? they need to be
>> used carefully, if at all."
> 
> How does this discourage the use of list comprehensions? At most, it 
> warns that complicated list comps are tricky. Complicated *anything* are 
> tricky.
> 
> 
>> and
>>
>> "In real world, you should prefer builtin functions to complex flow
>> statements."
> 
> That's ridiculous. The example given is a special case. That's like 
> saying "Loops are hard, so in the real world, if you want a loop, find a 
> builtin function that does what you want instead."
> 
> What's the "builtin function" we're supposed to prefer over a "complex 
> flow statement" like this?
> 
> # split text into word fragments of length <= 3
> sentence = "a sentence is a series of words"
> new = [word[i:i+3] for word in sentence.split() for i in range(0, len(word), 3)]

I often found list comprehension *more* readable than the equivalent 
for-loop because of its density. Seeing complex for-loop requires one 
step of thinking for each line, but in list comprehension I can skip 
some of the steps because I know what list comprehension would roughly 
look like.

i.e.

when I process this:

lst = []              #1
for i in range(10):   #2
     lst.append(i)     #3

I do 3 steps of thinking for each line

but seeing this is only one step, since I know it is going to create new 
list (skipping step #1) and I know i will be appended to that list 
(skipping step #3)


From lie.1296 at gmail.com  Thu May  7 05:18:56 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 07 May 2009 09:18:56 GMT
Subject: list comprehension question
In-Reply-To: <5yxMl.9285$y61.6301@news-server.bigpond.net.au>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>	<85ocucnbce.fsf@agentultra.com>	<mailman.4923.1241193638.11746.python-list@python.org>	<85ljpb8r1o.fsf@agentultra.com>	<mailman.5109.1241543371.11746.python-list@python.org>	<85d4am8hq4.fsf@agentultra.com>
	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
	<5yxMl.9285$y61.6301@news-server.bigpond.net.au>
Message-ID: <4IxMl.9287$y61.5756@news-server.bigpond.net.au>

Lie Ryan wrote:
> Steven D'Aprano wrote:
>>> "If you?ve got the stomach for it, list comprehensions can be nested.
>>> They are a powerful tool but ? like all powerful tools ? they need to be
>>> used carefully, if at all."
>>
>> How does this discourage the use of list comprehensions? At most, it 
>> warns that complicated list comps are tricky. Complicated *anything* 
>> are tricky.
>>
>>
>>> and
>>>
>>> "In real world, you should prefer builtin functions to complex flow
>>> statements."
>>
>> That's ridiculous. The example given is a special case. That's like 
>> saying "Loops are hard, so in the real world, if you want a loop, find 
>> a builtin function that does what you want instead."
>>
>> What's the "builtin function" we're supposed to prefer over a "complex 
>> flow statement" like this?
>>
>> # split text into word fragments of length <= 3
>> sentence = "a sentence is a series of words"
>> new = [word[i:i+3] for word in sentence.split() for i in range(0, 
>> len(word), 3)]
> 
> I often found list comprehension *more* readable than the equivalent 
> for-loop because of its density. Seeing complex for-loop requires one 
> step of thinking for each line, but in list comprehension I can skip 
> some of the steps because I know what list comprehension would roughly 
> look like.
> 
> i.e.
> 
> when I process this:
> 
> lst = []              #1
> for i in range(10):   #2
>     lst.append(i)     #3
> 
> I do 3 steps of thinking for each line
> 
> but seeing this is only one step, since I know it is going to create new 
> list (skipping step #1) and I know i will be appended to that list 
> (skipping step #3)

I don't know what I was thinking before sending that last line, here is 
what it was supposed to be:

but in list comprehension I see this in only one step, since I know it 
is going to create new list (skipping step #1) and I know 'i' will be 
appended to that list (skipping step #3) and this also continues to 
nested list comprehensions


From antroy at gmail.com  Thu May  7 05:20:03 2009
From: antroy at gmail.com (Ant)
Date: Thu, 7 May 2009 02:20:03 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
Message-ID: <c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>

On May 7, 8:03?am, OldGrantonian <OldGranton... at googlemail.com> wrote:
...
> I had Python 2.6 on my laptop.
>
> I needed "easyinstall" to install virtualenv. During installation of
> easyinstall, I got the message "Python 2.5 not found"
>
> So I installed Python 2.5, then installed virtualenv
>
> So I now have c:\Python 2.5 and c:\Python 2.6
...

Sounds like you've downloaded the Python 2.5 version of Easy Install.
If I were you I'd uninstall Python 2.5, and re-install easy_install
using the correct exe for Python 2.6.

Check that typing 'python' on the commandline still works, as
installing and uninstalling 2.5 may have messed up your path. if it
has, either manually add the Python install directory to the path, or
reinstall Python 2.6.

Note: have you changed the default install folder? I haven't got
Vista, but on XP it installs to c:\Python26 not "C:\Python 2.6". I'd
be carefull of changing the default install directory of Python,
particularly if you are "non-techy" as some packages installers may
look for Python in the default location.

--
Ant


From lie.1296 at gmail.com  Thu May  7 05:23:30 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 07 May 2009 09:23:30 GMT
Subject: list comprehension question
In-Reply-To: <0_qdnYwTacv122bUnZ2dnUVZ_rqdnZ2d@pdx.net>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>	<49FB2225.4030601@councilforeconed.org>
	<mailman.4930.1241197210.11746.python-list@python.org>
	<0_qdnYwTacv122bUnZ2dnUVZ_rqdnZ2d@pdx.net>
Message-ID: <mMxMl.9289$y61.3464@news-server.bigpond.net.au>

Scott David Daniels wrote:
> John Posner wrote:
>> Shane Geiger wrote:
>>>    if type(el) == list or type(el) is tuple:
>> A tiny improvement:
>>
>>        if type(el) in (list, tuple):
> 
> or (even better)
>     if isinstance(el, (list, tuple))
> 
> However, it is my contention that you shouldn't be flattening by type --
> you should know where, explicitly to flatten.  If I have 3-D points as
> triples, a tree of points would, by this code, get flattened into a
> a list of numbers.   If, however, I create a class with the same
> elements, but a method or two, suddenly flatten will produce a list
> of points.  It is my contention that the tree abstraction should be
> responsible for producing its leaves, rather than a blunderbus that
> doesn't know where one container abstraction ends, and its contents
> begin.  In other words, I'd like to see thigs like "flatten one layer."

Maybe that is why some modules like PIL or pygame accepts list of 
coordinates in flattened list of number instead of nested (i.e. they 
accepts [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] and do the grouping 
themself).


From lie.1296 at gmail.com  Thu May  7 05:32:38 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 07 May 2009 09:32:38 GMT
Subject: Logging exceptions to a file
In-Reply-To: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>
References: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>
Message-ID: <WUxMl.9292$y61.2903@news-server.bigpond.net.au>

Pierre GM wrote:
> All,
> I need to log messages to both the console and a given file. I use the
> following code (on Python 2.5)
> 
>>>> import logging
>>>> #
>>>> logging.basicConfig(level=logging.DEBUG,)
>>>> logfile = logging.FileHandler('log.log')
>>>> logfile.setLevel(level=logging.INFO)
>>>> logging.getLogger('').addHandler(logfile)
>>>> #
>>>> mylogger = logging.getLogger('mylogger')
>>>> #
>>>> mylogger.info("an info message")
> 
> So far so good, but I'd like to record (possibly unhandled) exceptions
> in the logfile.
> * Do I need to explicitly trap every single exception ?
> * In that case, won't I get 2 log messages on the console (as
> illustrated in the code below:
>>>> try:
>>>>     1/0
>>>> except ZeroDivisionError:
>>>>     mylogger.exception(":(")
>>>>     raise
> 
> Any comments/idea welcomed
> Cheers.
> 

Although it is usually not recommended to use a catch-all except, this 
is the case where it might be useful. JUST DON'T FORGET TO RE-RAISE THE 
EXCEPTION.

if __name__ == '__main__':
     try:
         main():
     except Exception, e:
         # log('Unhandled Exception', e)
         raise


From cournape at gmail.com  Thu May  7 05:33:10 2009
From: cournape at gmail.com (David Cournapeau)
Date: Thu, 7 May 2009 18:33:10 +0900
Subject: Statically linked extension and relative import
Message-ID: <5b8d13220905070233m4140472xd8fbcdc74985d073@mail.gmail.com>

Hi,

I am trying to build a 3rd party extension and link it statically to
python. I managed to get things working by customizing Setup.local in
python source tree, but I have a problem for imports of the 'foo.bar'
form. For example, let's say the 3rd party module is laid out as
follows:

foo/__init__.py
foo/bar.so

and __init__.py contains:
import foo.bar

I can build the bar extension and link it statically to python such as
from python, "import bar" works. But how can I make it "recognize"
"from foo import bar" ? I tried to understand how this works at the C
level in import.c, but I am a bit lost in the code. The ultimate goal
is to manage to get code coverage of the C code of the extension
through gcov, which does not support coverage of shared libraries ATM.

thanks,

David


From deets at nospam.web.de  Thu May  7 06:26:59 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 12:26:59 +0200
Subject: idea
References: <4A029EA0.3030403@inet.net.au>
Message-ID: <76fr8gF1cosptU1@mid.uni-berlin.de>

r-w wrote:

> Redirect sys.stderr to the log file in ANUGA logging.
> This might catch unexpected exceptions.

brillant.

Diez


From OJOHANS at StatoilHydro.com  Thu May  7 06:54:45 2009
From: OJOHANS at StatoilHydro.com (=?iso-8859-1?Q?=D8ystein_Johansen_=28OJOHANS=29?=)
Date: Thu, 7 May 2009 12:54:45 +0200
Subject: subprocess.Popen howto?
Message-ID: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>

Hi,
 
I have problems understanding the subprocess.Popen object. I have a iterative calculation in a process running and I want to pipe the output (stdout) from this calculation to a Python script.
 
Let me include a simple code that simulates the calculating process:
/* This code simulates a big iterative calculation */
#include <stdio.h>
#include <math.h>
 
int main()
{
 float val[2] = { M_PI, M_E };
 int i;
 
 for ( i = 0; i < 2 i++) {
  sleep( 15 );   /* It's a hard calculation. It take 15 seconds */
  printf("Value: %5.6f\n", val[i] );
  fflush( stdout );
 }
 return 0;
}
 
let's compile this to mycalc: gcc -o mycalc calc.c ... (untested code)
 
In C I have this code which starts the mycalc process and handles the output from it:
 
#include <stdio.h>
#include <assert.h>
#define BUF_SIZE 256
 
int main()
{
 FILE *pip;
 char line[BUF_SIZE];
 
 pip = popen("mycalc", "r");
 assert( pip != NULL );
 
 while ( fgets( line, BUF_SIZE, pip )) {
  printf( "Hello; I got: %s \n", line );
  fflush( stdout );
 }
 pclose( pip );
 return 0;
}

How can I make such while-loop in Python? I assume I should use subprocess.Popen(), but I can't figure out how?
 
-?ystein
 
 


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From OldGrantonian at googlemail.com  Thu May  7 06:58:50 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Thu, 7 May 2009 03:58:50 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
Message-ID: <61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com>

Thanks to both Steven D'Aprano and Ant :)

>>  Sounds like you've downloaded the Python 2.5 version of Easy Install.

There's no Python 2.6 version of EasyInstall :(

For 2.5, there is:

setuptools-0.6c9.win32-py2.5.exe

But for 2.6, it's:

setuptools-0.6c9-py2.6.egg

For any other egg file, I would use EasyInstall, but I don't think I
can use EasyInstall to install EasyInstall :)


From deets at nospam.web.de  Thu May  7 07:01:02 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 13:01:02 +0200
Subject: The Fujitsu Lifebook A6120
References: <7498de19-2aa8-4e3f-9988-8bb59fde8ff2@x1g2000prh.googlegroups.com>
	<gtu0am$6tu$1@aioe.org>
Message-ID: <76ft8aF1cqqq0U1@mid.uni-berlin.de>

> 
> Does it run Python?
> 
> (sorry, could not resist....)

You could at least resist to quote the spammers url, so it doesn't get
higher pagerank.

Diez 



From ggardiner at iee.org  Thu May  7 07:08:52 2009
From: ggardiner at iee.org (Geoff Gardiner)
Date: Thu, 07 May 2009 12:08:52 +0100
Subject: How do I test the integrity of a Python installation in Debian and
	Ubuntu
Message-ID: <4A02C144.1010704@iee.org>

How do I assure myself of the integrity of a Python installation
acquired using apt-get install on Debian and Ubuntu?

I can run regrtest but there's nothing in the basic installation to run,
viz.:

gegard at gegard:~$ python
Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52)
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from test import regrtest
>>> regrtest.main()
test_grammar
test_grammar skipped -- No module named test_grammar
... <etc> more of the same...
9 tests skipped:
    test_builtin test_doctest test_doctest2 test_exceptions
    test_grammar test_opcodes test_operations test_types test_unittest
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/test/regrtest.py", line 416, in main
    e = _ExpectedSkips()
  File "/usr/lib/python2.5/test/regrtest.py", line 1321, in __init__
    from test import test_socket_ssl
ImportError: cannot import name test_socket_ssl
>>>

I don't see where to go from here, so advice would be extremely helpful.

Background

I have a large Python-based system that I am trying to install on an
externally-hosted VM. It doesn't build and install correctly most of the
time, and I have tried successive images of Debian Lenny and Ubuntu
Hardy with mostly different build/installation results each time.

The installation proceeds Ok on a local Ubuntu VM.

A number of modules are installed in addition to python, but I can't
even see how to test the core python installation. There are few
test_*.py files in the installation.

I have previously encountered a fault on the server hosting the VM and
would like to be more comfortable that the python installation itself is
Ok (or have evidence that it's not).

Thank you,
Geoff



From castironpi at gmail.com  Thu May  7 07:27:15 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Thu, 7 May 2009 04:27:15 -0700 (PDT)
Subject: Why there is a parameter named "self" for classmethod function?
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com> 
	<4A024F18.9080407@kbsymanzik.org>
	<mailman.5206.1241671190.11746.python-list@python.org> 
	<pan.2009.05.07.06.29.56@REMOVE.THIS.cybersource.com.au>
Message-ID: <2c80e8d0-cc44-48b3-8b90-7b165eb20ed4@g20g2000vba.googlegroups.com>

On May 7, 1:29?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Thu, 07 May 2009 00:39:28 -0400, Terry Reedy wrote:
> > Functions that refer to neither the class nor an instance thereof can
> > usually be moved outside the class altogether. ?Python is not Java. ?I
> > believe staticmethod() was mainly added because it is needed for
> > .__new__(), at least in some appearances.
>
> Can be, but if there's reason enough to keep it with a class, there's no
> reason not to. Sometimes I have a class with a few methods that share
> common code, but that code happens to not include self (or cls). Since
> the common code is only of interest to that class, even though it doesn't
> need the instance, I factor the common code out into a method.
>
> This would be a good candidate for a staticmethod, only due to laziness I
> don't usually bother :)
>
> --
> Steven

It's also useful if you want to access the function using the syntax
of attributes, as in 'self.amethod' where 'amethod' is a static
method.  If I understand correctly, no bound method is created if the
function is static, and as such, the decorator can increase
performance.

> Can be, but if there's reason enough to keep it with a class, there's no
> reason not to.

That's a bit of hyperbole; the usual reasons such as code bloat,
namespace bloat, maintainability etc. all weigh against it.  It's just
that the benefits weigh heavier.

There is something that is 'correct' about it IMO, that is, provides
syntax to what is valid semantics in an OO context.  That may just be
another way of stating the thesis though.


From duncan.booth at invalid.invalid  Thu May  7 07:34:01 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 7 May 2009 11:34:01 GMT
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com>
Message-ID: <Xns9C047FE3D4338duncanbooth@127.0.0.1>

OldGrantonian <OldGrantonian at googlemail.com> wrote:

> Thanks to both Steven D'Aprano and Ant :)
> 
>>>  Sounds like you've downloaded the Python 2.5 version of Easy Install.
> 
> There's no Python 2.6 version of EasyInstall :(

I wonder what I've been running then?

> 
> For 2.5, there is:
> 
> setuptools-0.6c9.win32-py2.5.exe
> 
> But for 2.6, it's:
> 
> setuptools-0.6c9-py2.6.egg
> 
> For any other egg file, I would use EasyInstall, but I don't think I
> can use EasyInstall to install EasyInstall :)

No, but you can use ez_setup.

Go to http://peak.telecommunity.com/dist/ez_setup.py and save the content 
of that file as ez_setup.py (cut and paste into your favourite editor may 
be the simplest way) then run it with your chosen Python. It will find and 
install the appropriate version of easy install.



-- 
Duncan Booth http://kupuguy.blogspot.com


From andymac at bullseye.apana.org.au  Thu May  7 07:34:22 2009
From: andymac at bullseye.apana.org.au (Andrew MacIntyre)
Date: Thu, 07 May 2009 21:34:22 +1000
Subject: Statically linked extension and relative import
In-Reply-To: <5b8d13220905070233m4140472xd8fbcdc74985d073@mail.gmail.com>
References: <5b8d13220905070233m4140472xd8fbcdc74985d073@mail.gmail.com>
Message-ID: <4A02C73E.8040105@bullseye.andymac.org>

David Cournapeau wrote:
> Hi,
> 
> I am trying to build a 3rd party extension and link it statically to
> python. I managed to get things working by customizing Setup.local in
> python source tree, but I have a problem for imports of the 'foo.bar'
> form. For example, let's say the 3rd party module is laid out as
> follows:
> 
> foo/__init__.py
> foo/bar.so
> 
> and __init__.py contains:
> import foo.bar
> 
> I can build the bar extension and link it statically to python such as
> from python, "import bar" works. But how can I make it "recognize"
> "from foo import bar" ? I tried to understand how this works at the C
> level in import.c, but I am a bit lost in the code. The ultimate goal
> is to manage to get code coverage of the C code of the extension
> through gcov, which does not support coverage of shared libraries ATM.

If you link the bar extension statically, it is not in the foo package
namespace (which is why "import bar" works), so should be imported as bar
in foo's __init__.py.

from foo import bar

should then work from other code by virtue of the package namespace
(instantiated by __init__.py) then having a bar symbol.

-- 
-------------------------------------------------------------------------
Andrew I MacIntyre                     "These thoughts are mine alone..."
E-mail: andymac at bullseye.apana.org.au  (pref) | Snail: PO Box 370
        andymac at pcug.org.au             (alt) |        Belconnen ACT 2616
Web:    http://www.andymac.org/               |        Australia


From cournape at gmail.com  Thu May  7 07:45:17 2009
From: cournape at gmail.com (David Cournapeau)
Date: Thu, 7 May 2009 20:45:17 +0900
Subject: Statically linked extension and relative import
In-Reply-To: <4A02C73E.8040105@bullseye.andymac.org>
References: <5b8d13220905070233m4140472xd8fbcdc74985d073@mail.gmail.com>
	<4A02C73E.8040105@bullseye.andymac.org>
Message-ID: <5b8d13220905070445q7734fdffsff108c04e492a74a@mail.gmail.com>

On Thu, May 7, 2009 at 8:34 PM, Andrew MacIntyre
<andymac at bullseye.apana.org.au> wrote:
> David Cournapeau wrote:
>>
>> Hi,
>>
>> I am trying to build a 3rd party extension and link it statically to
>> python. I managed to get things working by customizing Setup.local in
>> python source tree, but I have a problem for imports of the 'foo.bar'
>> form. For example, let's say the 3rd party module is laid out as
>> follows:
>>
>> foo/__init__.py
>> foo/bar.so
>>
>> and __init__.py contains:
>> import foo.bar
>>
>> I can build the bar extension and link it statically to python such as
>> from python, "import bar" works. But how can I make it "recognize"
>> "from foo import bar" ? I tried to understand how this works at the C
>> level in import.c, but I am a bit lost in the code. The ultimate goal
>> is to manage to get code coverage of the C code of the extension
>> through gcov, which does not support coverage of shared libraries ATM.
>
> If you link the bar extension statically, it is not in the foo package
> namespace (which is why "import bar" works),

Yes, I understand this.

> so should be imported as bar
> in foo's __init__.py.
>
> from foo import bar

But then I have to modify the 3rd party package for statically linked
versions. This means in particular that the same source cannot be used
for static and dynamic builds ?

cheers,

David


From deank at yahoo.com  Thu May  7 08:25:55 2009
From: deank at yahoo.com (dean)
Date: Thu, 7 May 2009 14:25:55 +0200
Subject: ply and threads
Message-ID: <69x52b9mwk23.1efmsdyffrpz4$.dlg@40tude.net>

I have two threads that exchange information by passing messages. I wanted
to parse those messages with ply. I'd prefer using two independent parsers
so that I can avoid using locks.

Can somebody explain how to do this with ply? Ply seems to be doing a lot
of odd things, such as reading the the python file that imported it,
reading doc strings of it's functions, etc, so I'm not sure how to make
this thread safe. This is from yacc.py:

# The current implementation is only somewhat object-oriented. The
# LR parser itself is defined in terms of an object (which allows multiple
# parsers to co-exist).  However, most of the variables used during table
# construction are defined in terms of global variables.  Users shouldn't
# notice unless they are trying to define multiple parsers at the same
# time using threads (in which case they should have their head examined).

It would seem that creating two parsers in the main thread, and then
passing one of them to the other thread, is all I need to do to be thread
safe?

But then again I'm not even sure how to create two parsers. Examples I've
seen just call yacc.yacc() at the end, and do not even access yacc
instances.

Any help is appreciated and thanks in advance.

Dean


From garryvin at gmail.com  Thu May  7 08:49:31 2009
From: garryvin at gmail.com (garryvin)
Date: Thu, 7 May 2009 05:49:31 -0700 (PDT)
Subject: Open the franchisee of Karvy
Message-ID: <0c55a0e5-fb85-41db-acb4-222e0d0f42fc@y6g2000prf.googlegroups.com>

Karvy stock broking introduces, Karvy Fortune a business opportunity
for individuals in similar business from Karvy, it gives the
opportunity to associate with ?Karvy Family? as Franchisee, Remisser,
or as an Independent Financial Advisors. Karvy Stock Broking Ltd ranks
among 5 stock brokers in India, it ranks among top 5 Depositary
Participants in India, with the huge net work of over 500 branches in
375 locations across India and overseas at Dubai, executes 150,000+
trades in NSE/BSE. Karvy Has a top notch research team, advisory team,
technology support team to serve it?s customers in 24/7 manner.
http://www.karvy.com/v2/fortune/fortunegroups/index.asp


From matt at tplus1.com  Thu May  7 08:58:50 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Thu, 07 May 2009 12:58:50 GMT
Subject: How should I use grep from python?
Message-ID: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>

I'm writing a command-line application and I want to search through lots
of text files for a string.  Instead of writing the python code to do
this, I want to use grep.

This is the command I want to run:

$ grep -l foo dir

In other words, I want to list all files in the directory dir that
contain the string "foo".

I'm looking for the "one obvious way to do it" and instead I found no
consensus.  I could os.popen, commands.getstatusoutput, the subprocess
module, backticks, etc.  

As of May 2009, what is the recommended way to run an external process
like grep and capture STDOUT and the error code?


TIA

Matt


From google at mrabarnett.plus.com  Thu May  7 09:03:54 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 07 May 2009 14:03:54 +0100
Subject: Code works fine except...
In-Reply-To: <b2cf45ed-d3da-4d93-883c-c8985d40ad55@r34g2000vba.googlegroups.com>
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com>
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com>
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com>
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com>
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com>
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>
	<mailman.5111.1241544824.11746.python-list@python.org>	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com>
	<mailman.5143.1241594966.11746.python-list@python.org>	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>	<1d8802ff-8211-467f-95c1-4616e3bd7300@s20g2000vbp.googlegroups.com>
	<b2cf45ed-d3da-4d93-883c-c8985d40ad55@r34g2000vba.googlegroups.com>
Message-ID: <4A02DC3A.6050300@mrabarnett.plus.com>

John Yeung wrote:
> On May 7, 12:30 am, Ross <ross.j... at gmail.com> wrote:
>> If I were to set up a dictionary that counted players used in the bye
>> list and only allowed players to be added to the bye list if they were
>> within 2 of the least used player, would this be a good approach for
>> managing bye selection or would using a dictionary in this manner be
>> unnecessary/redundant?
> 
> I certainly have not proved it, but I think you don't need to resort
> to anything fancy if you are OK with the maximum byes being within two
> of the minimum byes.  (Maybe this needs to be larger with larger
> numbers of players.)  Try using your original shuffle but instead of
> selecting matches to "throw away" each week, just use the matches you
> need (to fill up the courts) and pick up where you left off the next
> week.  For example, with 10 players, each "round" ideally consists of
> five matches.  If you only have four courts, don't throw away the
> fifth match; save it as the first match next week.
> 
> To be honest, I didn't look too carefully at your original shuffle.
> It may be good enough.  It's a little different than the "standard"
> rotation as presented on Wikipedia:
> 
>   http://en.wikipedia.org/wiki/Round-robin_tournament#Scheduling_algorithm
> 
> The one on Wikipedia happened to pass my casual tests with no more
> than a 2-bye difference between the most-played and least-played
> players, and didn't run into the problem of scheduling the same player
> for two matches the same week.  But I have to stress I only tried a
> few starting values, which all worked; I didn't try to break it, or
> run an extensive battery of tests.
> 
It might be an idea to run an exhaustive test on small, but not too
small, values in order to see whether the minimum difference can, in
fact, be one. If the minimum difference turns out to be two then you
might as well stick to a simple algorithm, as long as its minimum
difference is two.


From piet at cs.uu.nl  Thu May  7 09:04:57 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Thu, 07 May 2009 15:04:57 +0200
Subject: Checking for required arguments when instantiating class.
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
	<m21vr2mnac.fsf@cs.uu.nl>
	<mailman.5149.1241613418.11746.python-list@python.org>
Message-ID: <m2ocu5kqrq.fsf@cs.uu.nl>

>>>>> Chris Rebert <clp2 at rebertia.com> (CR) wrote:

>CR> On Wed, May 6, 2009 at 5:24 AM, Piet van Oostrum <piet at cs.uu.nl> wrote:
>>>>>>>> Lacrima <Lacrima.Maxim at gmail.com> (L) wrote:

>L> But what if I have to instantiate any class with 3 or 4 required
>L> arguments? How can I do it?
>>> 
>>> cls.__init__.im_func.__code__.co_argcount
>>> 
>>> This will include self, so it will be 1 in First and 2 in Second.

>CR> AFAICT, that would count non-required arguments too, which isn't
>CR> strictly what the OP requested.

If you mean, parameters with default values, yes. Of course you can find
out how many of these there are from cls.__init__.func_defaults, but
this will get dirtier and dirtier.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From deets at nospam.web.de  Thu May  7 09:09:53 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 15:09:53 +0200
Subject: How should I use grep from python?
References: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
Message-ID: <76g4ptF1ce8m3U1@mid.uni-berlin.de>

Matthew Wilson wrote:

> I'm writing a command-line application and I want to search through lots
> of text files for a string.  Instead of writing the python code to do
> this, I want to use grep.
> 
> This is the command I want to run:
> 
> $ grep -l foo dir
> 
> In other words, I want to list all files in the directory dir that
> contain the string "foo".
> 
> I'm looking for the "one obvious way to do it" and instead I found no
> consensus.  I could os.popen, commands.getstatusoutput, the subprocess
> module, backticks, etc.
> 
> As of May 2009, what is the recommended way to run an external process
> like grep and capture STDOUT and the error code?

subprocess. Which becomes pretty clear when reading it's docs:

"""
The subprocess module allows you to spawn new processes, connect to their
input/output/error pipes, and obtain their return codes. This module
intends to replace several other, older modules and functions, such as:
os.system
os.spawn*
os.popen*
popen2.*
commands.*
"""

Diez


From Scott.Daniels at Acm.Org  Thu May  7 09:12:08 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 07 May 2009 06:12:08 -0700
Subject: [Python-Dev] [RELEASED] Python 3.1 beta 1
In-Reply-To: <mailman.5207.1241681372.11746.python-list@python.org>
References: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com>
	<mailman.5207.1241681372.11746.python-list@python.org>
Message-ID: <_fKdncjfm5xjQZ_XnZ2dnUVZ_rSdnZ2d@pdx.net>

Daniel Fetchinson wrote:
>> Other features include an ordered dictionary implementation
> 
> Are there plans for backporting this to python 2.x just as
> multiprocessing has been?

Why not grab the 3.1 code and do it yourself for your 2.X's?
It should be far less work than attempting something as
fidgety as multiprocessing.

--Scott David Daniels
Scott.Daniels at Acm.Org



From pierregmcode at gmail.com  Thu May  7 09:19:02 2009
From: pierregmcode at gmail.com (Pierre GM)
Date: Thu, 7 May 2009 06:19:02 -0700 (PDT)
Subject: Logging exceptions to a file
References: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>
	<WUxMl.9292$y61.2903@news-server.bigpond.net.au>
Message-ID: <01129a12-312c-4cb9-a0f4-5a456bd9eb6a@e24g2000vbe.googlegroups.com>

On May 7, 5:32?am, Lie Ryan <lie.1... at gmail.com> wrote:
> Pierre GM wrote:
> > All,
> > I need to log messages to both the console and a given file. I use the
> > following code (on Python 2.5)
>
> >>>> import logging
> >>>> #
> >>>> logging.basicConfig(level=logging.DEBUG,)
> >>>> logfile = logging.FileHandler('log.log')
> >>>> logfile.setLevel(level=logging.INFO)
> >>>> logging.getLogger('').addHandler(logfile)
> >>>> #
> >>>> mylogger = logging.getLogger('mylogger')
> >>>> #
> >>>> mylogger.info("an info message")
>
> > So far so good, but I'd like to record (possibly unhandled) exceptions
> > in the logfile.
> > * Do I need to explicitly trap every single exception ?
> > * In that case, won't I get 2 log messages on the console (as
> > illustrated in the code below:
> >>>> try:
> >>>> ? ? 1/0
> >>>> except ZeroDivisionError:
> >>>> ? ? mylogger.exception(":(")
> >>>> ? ? raise
>
> > Any comments/idea welcomed
> > Cheers.
>
> Although it is usually not recommended to use a catch-all except, this
> is the case where it might be useful. JUST DON'T FORGET TO RE-RAISE THE
> EXCEPTION.
>
> if __name__ == '__main__':
> ? ? ?try:
> ? ? ? ? ?main():
> ? ? ?except Exception, e:
> ? ? ? ? ?# log('Unhandled Exception', e)
> ? ? ? ? ?raise

OK for a simple script, but the (unhandled) exceptions need to be
caught at the module level. Any idea?


From python.list at tim.thechases.com  Thu May  7 09:25:52 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 07 May 2009 08:25:52 -0500
Subject: How should I use grep from python?
In-Reply-To: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
References: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
Message-ID: <4A02E160.3090105@tim.thechases.com>

> I'm writing a command-line application and I want to search through lots
> of text files for a string.  Instead of writing the python code to do
> this, I want to use grep.
> 
> This is the command I want to run:
> 
> $ grep -l foo dir
> 
> In other words, I want to list all files in the directory dir that
> contain the string "foo".
> 
> I'm looking for the "one obvious way to do it" and instead I found no
> consensus.  I could os.popen, commands.getstatusoutput, the subprocess
> module, backticks, etc.  

While it doesn't use grep or external processes, I'd just do it 
in pure Python:

   def files_containing(location, search_term):
     for fname in os.listdir(location):
       fullpath = os.path.join(location, fname)
       if os.isfile(fullpath):
         for line in file(fullpath):
           if search_term in line:
             yield fname
             break
   for fname in files_containing('/tmp', 'term'):
     print fname

It's fairly readable, you can easily tweak the search methods 
(case sensitive, etc), change it to be recursive by using 
os.walk() instead of listdir(), it's cross-platform, and doesn't 
require the overhead of an external process (along with the 
"which call do I use to spawn the function" questions that come 
with it :)

However, to answer your original question, I'd use os.popen which 
is the one I see suggested most frequently.

-tkc





From jnoller at gmail.com  Thu May  7 09:28:46 2009
From: jnoller at gmail.com (Jesse Noller)
Date: Thu, 7 May 2009 09:28:46 -0400
Subject: [Python-Dev] [RELEASED] Python 3.1 beta 1
In-Reply-To: <_fKdncjfm5xjQZ_XnZ2dnUVZ_rSdnZ2d@pdx.net>
References: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com>
	<mailman.5207.1241681372.11746.python-list@python.org>
	<_fKdncjfm5xjQZ_XnZ2dnUVZ_rSdnZ2d@pdx.net>
Message-ID: <4222a8490905070628m22cb28eeiad04969822e741c@mail.gmail.com>

On Thu, May 7, 2009 at 9:12 AM, Scott David Daniels
<Scott.Daniels at acm.org> wrote:
> Daniel Fetchinson wrote:
>>>
>>> Other features include an ordered dictionary implementation
>>
>> Are there plans for backporting this to python 2.x just as
>> multiprocessing has been?
>
> Why not grab the 3.1 code and do it yourself for your 2.X's?
> It should be far less work than attempting something as
> fidgety as multiprocessing.
>
> --Scott David Daniels
> Scott.Daniels at Acm.Org

Don't worry, we gave multiprocessing some ADHD meds :)


From matt at tplus1.com  Thu May  7 09:31:44 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Thu, 07 May 2009 13:31:44 GMT
Subject: How should I use grep from python?
References: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
	<76g4ptF1ce8m3U1@mid.uni-berlin.de>
Message-ID: <4pBMl.21853$as4.605@nlpi069.nbdc.sbc.com>

On Thu 07 May 2009 09:09:53 AM EDT, Diez B. Roggisch wrote:
> Matthew Wilson wrote:
>> 
>> As of May 2009, what is the recommended way to run an external process
>> like grep and capture STDOUT and the error code?
>
> subprocess. Which becomes pretty clear when reading it's docs:

Yeah, that's what I figured, but I wondered if there was already
something newer and shinier aiming to bump subprocess off its throne.

I'll just stick with subprocess for now.  Thanks for the feedback!


From muhammadanushanif at gmail.com  Thu May  7 09:42:42 2009
From: muhammadanushanif at gmail.com (muhammadanushanif at gmail.com)
Date: Thu, 7 May 2009 06:42:42 -0700 (PDT)
Subject: Get Into The World Of YOUSUF JUSANI
Message-ID: <cd1da232-434a-45ba-9913-a7eb334f9dc4@h23g2000vbc.googlegroups.com>

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From matt at tplus1.com  Thu May  7 09:46:13 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Thu, 07 May 2009 13:46:13 GMT
Subject: How should I use grep from python?
References: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
	<mailman.5217.1241702763.11746.python-list@python.org>
Message-ID: <FCBMl.21855$as4.1221@nlpi069.nbdc.sbc.com>

On Thu 07 May 2009 09:25:52 AM EDT, Tim Chase wrote:
> While it doesn't use grep or external processes, I'd just do it 
> in pure Python:

Thanks for the code!

I'm reluctant to take that approach for a few reasons:

1. Writing tests for that code seems like a fairly large amount of work.
I think I'd need to to either mock out lots of stuff or create a bunch
of temporary directories and files for each test run.

I don't intend to test that grep works like it says it does.  I'll
just test that my code calls a mocked-out grep with the right options
and arguments, and that my code behaves nicely when my mocked-out
grep returns errors.

2. grep is crazy fast.  For a search through just a few files, I doubt
it would matter, but when searching through a thousand files (which is
likely) I suspect that an all-python approach might lag behind.  I'm
speculating here, though.

3. grep has lots and lots of cute options.  I don't want to think about
implementing stuff like --color, for example.  If I just pass all the
heavy lifting to grep, I'm already done.

On the other hand, your solution is platform-independent and has no
dependencies.  Mine depends on an external grep command.

Thanks again for the feedback!

Matt



From marco at sferacarta.com  Thu May  7 09:55:18 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Thu, 07 May 2009 15:55:18 +0200
Subject: How should I use grep from python?
In-Reply-To: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
References: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
Message-ID: <bLBMl.6969$Ux.2205@tornado.fastwebnet.it>

Matthew Wilson wrote:

> consensus.  I could os.popen, commands.getstatusoutput, the subprocess
> module, backticks, etc.

Backticks do_not_do what you think they do.

And with py3k they're also as dead as a dead parrot.




From dina.ali08 at googlemail.com  Thu May  7 10:02:00 2009
From: dina.ali08 at googlemail.com (Dina Ali)
Date: Thu, 7 May 2009 15:02:00 +0100
Subject: pyMPI error on mpi.barrier()
Message-ID: <4a031c930905070702x169d2141ibeadbae2853a64e4@mail.gmail.com>

Hello there

I am trying to paralleize GA code using pyMPI. part of the code and and the
error message is as below.
i write the new positions in a file by root (which is mpi.rank = 0) then
other processes are suppose to wait
until the written in the file finishes to start evaluating the objective.
the problem arises in the barrier method...
any ideas on how to do this would be very much appreciated..

Thanks very much
Dina

for i in xrange(max_iter):
            if (mpi.rank == 0):
                update_positions()
                save_pso_pops_iter()

            mpi.barrier()  <----------------------------error is here
            evaluate_objective()
            mpi.barrier()

error message:
    mpi.barrier()
mpi.MPIError: MPI_Error_string: invalid communicator: Input/output error
(pyMPI_comm_io.c:367)
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From debatem1 at gmail.com  Thu May  7 10:02:20 2009
From: debatem1 at gmail.com (CTO)
Date: Thu, 7 May 2009 07:02:20 -0700 (PDT)
Subject: [RELEASED] Python 3.1 beta 1
References: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com> 
	<mailman.5207.1241681372.11746.python-list@python.org>
	<_fKdncjfm5xjQZ_XnZ2dnUVZ_rSdnZ2d@pdx.net>
Message-ID: <6f0c942f-f393-454c-b921-8eb42c5ab18d@s16g2000vbp.googlegroups.com>

On May 7, 9:12?am, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> Daniel Fetchinson wrote:
> >> Other features include an ordered dictionary implementation
>
> > Are there plans for backporting this to python 2.x just as
> > multiprocessing has been?
>
> Why not grab the 3.1 code and do it yourself for your 2.X's?
> It should be far less work than attempting something as
> fidgety as multiprocessing.
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

If OrderedDict winds up being backported, will you include it
in 2.x?

Geremy Condra



From gnewsg at gmail.com  Thu May  7 10:03:16 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Thu, 7 May 2009 07:03:16 -0700 (PDT)
Subject: ANN: Python process utility (psutil) 0.1.2 released
Message-ID: <65f15b53-aacf-4651-a113-960cce25f205@p4g2000vba.googlegroups.com>

Hi,
I'm pleased to announce the 0.1.2 release of psutil:
http://code.google.com/p/psutil

=== About ===

psutil is a module providing an interface for retrieving information
on running processes and system utilization (CPU, memory) in a
portable way by using Python, implementing many functionalities
offered by tools like ps, top and Windows task manager.
It currently supports Linux, OS X, FreeBSD and Windows.

=== Enhancements ===

Aside from fixing some bugs psutil 0.1.2 includes the following major
enhancements:

 * per-process CPU user/kernel times
 * per-process create time
 * per-process CPU utilization percentage
 * per-process memory usage (bytes)
 * per-process memory utilization (percent)
 * total, used and free system physical/virtual memory

As of now psutil is released to the general public, and should be
considered a beta release implementing basic functionality.
With this third release we'd like to receive feedback from users and
suggestions for additional functionality.
Patches and volunteers to test/develop for additional platforms
welcome!

=== Links ===

* Home page: http://code.google.com/p/psutil
* Mailing list: http://groups.google.com/group/psutil/topics
* Source tarball: http://psutil.googlecode.com/files/psutil-0.1.2.tar.gz
* OS X installer: http://psutil.googlecode.com/files/psutil-0.1.2-py2.6-macosx10.4.dmg
* Windows Installer (Python 2.6): http://psutil.googlecode.com/files/psutil-0.1.2.win32-py2.6.exe
* Api Reference: http://code.google.com/p/psutil/wiki/Documentation

Thanks


--- Giampaolo Rodola'
http://code.google.com/p/pyftpdlib
http://code.google.com/p/psutil/


From suraj at barkale.com  Thu May  7 10:09:36 2009
From: suraj at barkale.com (Suraj Barkale)
Date: Thu, 7 May 2009 14:09:36 +0000 (UTC)
Subject: Parsing text
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <loom.20090507T140449-363@post.gmane.org>

iainemsley <iainemsley <at> googlemail.com> writes:

> 
> Hi,
> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.
> 
> for scene in text.split('Scene'):
>     num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)
>     textNum = num.match(scene)
>     if textNum:
>         print textNum
>     else:
>         print "No scene number"
>     m = '<div type="scene>'
>     m += scene
>     m += '<\div>'
>     print m
> 
> Thanks, Iain
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
> 

Are you trying to match Roman numerals? As others have said, it is difficult to
make any suggestions without knowing the input to your program.

You may want to look at PyParsing (http://pyparsing.wikispaces.com/) to parse
the text file without messing with regular expressions.

Regards,
Suraj



From aahz at pythoncraft.com  Thu May  7 10:29:46 2009
From: aahz at pythoncraft.com (Aahz)
Date: 7 May 2009 07:29:46 -0700
Subject: FLV download script works, but I want to enhance it
References: <mailman.5134.1241579669.11746.python-list@python.org>
Message-ID: <gtur8q$b2n$1@panix3.panix.com>

In article <mailman.5134.1241579669.11746.python-list at python.org>,
The Music Guy  <musicguy at alphaios.net> wrote:
>
>After I download the files, I usually want to convert them to another
>video format using command line tools, and I usually convert each one
>in a separate terminal since that way they can all be converted at the
>same time rather than one-by-one. Oddly enough, converting tends to
>take longer than downloading, but converting multiple files at once is
>faster than converting them one-by-one.

Here's my download script to get you started figuring this out, it does
the wget in the background so that several downloads can run in parallel
from a single terminal window:

#!/bin/bash

echo "Downloading $1"
wget "$1" > /dev/null 2>&1 &
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From nick at craig-wood.com  Thu May  7 10:30:11 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Thu, 07 May 2009 09:30:11 -0500
Subject: How should I use grep from python?
References: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
Message-ID: <slrnh05prp.cbq.nick@irishsea.home.craig-wood.com>

Matthew Wilson <matt at tplus1.com> wrote:
>  I'm writing a command-line application and I want to search through lots
>  of text files for a string.  Instead of writing the python code to do
>  this, I want to use grep.
> 
>  This is the command I want to run:
> 
>  $ grep -l foo dir
> 
>  In other words, I want to list all files in the directory dir that
>  contain the string "foo".
> 
>  I'm looking for the "one obvious way to do it" and instead I found no
>  consensus.  I could os.popen, commands.getstatusoutput, the subprocess
>  module, backticks, etc.  

backticks is some other language ;-)

>  As of May 2009, what is the recommended way to run an external process
>  like grep and capture STDOUT and the error code?

This is the one true way now-a-days

>>> from subprocess import Popen, PIPE
>>> p = Popen(["ls", "-l"], stdout=PIPE)
>>> for line in p.stdout:
...     print line
...
total 93332

-rw-r--r--  1 ncw ncw      181 2007-10-18 14:01 -

drwxr-xr-x  2 ncw ncw     4096 2007-08-29 22:56 10_files

-rw-r--r--  1 ncw ncw   124713 2007-08-29 22:56 10.html
[snip]
>>> p.wait() # returns the error code
0
>>>

There was talk of removing the other methods from public use for 3.x.
Not sure of the conclusion.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From hackingkk at gmail.com  Thu May  7 10:41:16 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Thu, 07 May 2009 20:11:16 +0530
Subject: Which python version do I use with "virtualenv"?
In-Reply-To: <c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
Message-ID: <1241707276.5822.3.camel@kk-laptop>

I have another question in this same context.
I have python 2.6 and want to set up a vertualenv
in /opt/turbogears/python2.5.
Then use this for all the things a turbogears based application would
need for project execution.

so I have decided that I will download python 2.5 and compile it
with ./configure --prefix=/opt/turbogears/python2.5 and then install
turbogears.  Is this possible?  will this kind of python compilation
help me to create a vertualenv in the place where I have python2.5?

or is there any other way to do this?  I really need vertualenv and
would want to use python2.5 because I feel easy install won't work with
python2.6

happy hacking.
Krishnakant.






From deets at nospam.web.de  Thu May  7 10:52:49 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 16:52:49 +0200
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
	<mailman.5221.1241707291.11746.python-list@python.org>
Message-ID: <76gaqtF1d8bv6U1@mid.uni-berlin.de>

Krishnakant wrote:

> I have another question in this same context.
> I have python 2.6 and want to set up a vertualenv
> in /opt/turbogears/python2.5.
> Then use this for all the things a turbogears based application would
> need for project execution.
> 
> so I have decided that I will download python 2.5 and compile it
> with ./configure --prefix=/opt/turbogears/python2.5 and then install
> turbogears.  Is this possible?  will this kind of python compilation
> help me to create a vertualenv in the place where I have python2.5?

You are confusing virtualenv with a custom-build python. You can of course
use VE with a custom-build python, but then there isn't as much use for it,
as you then have a distinct python-instance already - unless you are going
to share it amongst projects, which then leads to the question why you
don't use VE *without* the custom-build python.
 
> or is there any other way to do this?  I really need vertualenv and
> would want to use python2.5 because I feel easy install won't work with
> python2.6

Feelings are a fine thing in bed, on weddings or other social contexts.
Usually, they don't belong in the more mundane world of computers, and in
this case it's an outright wrong feeling. Easy_install works just fine with
py2.6

It might be though that there are some 3rd-party-libs that don't.

Diez


From hackingkk at gmail.com  Thu May  7 11:03:18 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Thu, 07 May 2009 20:33:18 +0530
Subject: Which python version do I use with "virtualenv"?
In-Reply-To: <76gaqtF1d8bv6U1@mid.uni-berlin.de>
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
	<mailman.5221.1241707291.11746.python-list@python.org>
	<76gaqtF1d8bv6U1@mid.uni-berlin.de>
Message-ID: <1241708598.5822.8.camel@kk-laptop>


> You are confusing virtualenv with a custom-build python. You can of course
> use VE with a custom-build python, but then there isn't as much use for it,
> as you then have a distinct python-instance already - unless you are going
> to share it amongst projects, which then leads to the question why you
> don't use VE *without* the custom-build python.
Well, Turbogears works perfectly with python2.5, although there are
people who use it with 2.6 as well.
I have to keep 2.6 because my screen reader orca giave me some problem
with 2.5.

So I have no option but to keep a seperate python2.5 in some different
directory and have ve use it.

would just like to know how I can get ve to use that installation and
not the one on my system by default.

happy hacking.
Krishnakant.
  





From deets at nospam.web.de  Thu May  7 11:18:52 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 17:18:52 +0200
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
	<mailman.5221.1241707291.11746.python-list@python.org>
	<76gaqtF1d8bv6U1@mid.uni-berlin.de>
	<mailman.5222.1241708608.11746.python-list@python.org>
Message-ID: <76gcboF1c6nm5U1@mid.uni-berlin.de>

Krishnakant wrote:

> 
>> You are confusing virtualenv with a custom-build python. You can of
>> course use VE with a custom-build python, but then there isn't as much
>> use for it, as you then have a distinct python-instance already - unless
>> you are going to share it amongst projects, which then leads to the
>> question why you don't use VE *without* the custom-build python.
> Well, Turbogears works perfectly with python2.5, although there are
> people who use it with 2.6 as well.
> I have to keep 2.6 because my screen reader orca giave me some problem
> with 2.5.
> 
> So I have no option but to keep a seperate python2.5 in some different
> directory and have ve use it.
> 
> would just like to know how I can get ve to use that installation and
> not the one on my system by default.

By *using* it? 

/opt/my_python/bin/python2.5

and you're done. If you e.g. download ez_setup.py & execute that through
your custom python, you'll end up with an easy_install
in /opt/my_python/bin, which you then can use to e.g. install VE.

Diez


From jamieson74 at gmail.com  Thu May  7 11:20:25 2009
From: jamieson74 at gmail.com (jamieson)
Date: Thu, 7 May 2009 08:20:25 -0700 (PDT)
Subject: tkinter and widget placement after resizing
Message-ID: <bfc1d96a-3ea3-4bd8-a06a-afb352e608c8@l5g2000vbc.googlegroups.com>

Hello,

I've got a fairly simple GUI that places pmw.EntryFields into a window
starting in the upper left corner.  When the first column is filled
with these widgets I'd like to start a new column and continue
placement, and so on.  It is working now with the grid manager if I
explicitly set the max number of widgets per column, but if I resize
the main window there is wasted space as the number of widgets per
column is fixed.  I'd like to find a design that could change the
number of widgets per column when the window is resized.  Any
suggestions?

i.e. start out with a window like this:

[1][4][7]
[2][5][8]
[3][6][9]


make the main window larger and end up with this:

[1][6]
[2][7]
[3][8]
[4][9]
[5]


From coldtortuga at gmail.com  Thu May  7 11:21:51 2009
From: coldtortuga at gmail.com (Francis Carr)
Date: Thu, 7 May 2009 08:21:51 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
Message-ID: <f23ebd9d-f445-4ebf-9b87-971d3ab295f6@p4g2000vba.googlegroups.com>

Scheme is arguably the programming language with the most support for
recursion, including the most complete support for tail-call
optimization, constructs like "letrec" to define collections of
multiply-recursive functions (which get used very frequently -- by no
means is it an uncommon situation, as you suggest in your initial
post), and hardly any iterative loops.  Yet -- scheme does not provide
out-of-the-box support for your proposed "let-a-function-implicitly-
refer-to-itself" idea.  This suggests that the idea itself runs
counter to more important aspects of a programming language.

In the special case of a self-recursive function, you would like re-
naming "to just work".  Out of morbid curiosity, I am compelled to
ask... why do you expect that re-naming anything --- a function, a
class, a module, a variable, anything --- in just one place but not
all the others should ever, under any circumstances, "just work" ?


From elwinter at verizon.net  Thu May  7 11:22:06 2009
From: elwinter at verizon.net (Eric Winter)
Date: Thu, 7 May 2009 08:22:06 -0700 (PDT)
Subject: Unable to build libpython2.5.so on OS X 10.4
Message-ID: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>

Hi all. I'm trying to build some internal code that needs to link
against libpython2.5.so on a OS X 10.4 (Tiger) machine. It seems that
no matter what combination of options and environment variables I give
to the configure script from python 2.5.1, all I get is the
libpython2.5.a (the static library). I've googled the problem and
searched the comp.lang.python archives, but I have been unable to find
anything that works.

Is there some special magic I have to invoke to do this? I've not done
any Mac development, so there may be some obvious point I am missing.
The Python README file and configure script comments are not getting
me very far.

TIA,
Eric Winter
NASA GSFC
Fermi Gamma-Ray Space Telescope Science Support Center


From navanjo at gmail.com  Thu May  7 11:34:46 2009
From: navanjo at gmail.com (Navanjo)
Date: Thu, 7 May 2009 08:34:46 -0700 (PDT)
Subject: P2P text chat engine
Message-ID: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>

If you have the source code of a p2p text chat engine please send to me


From tomf.sessile at gmail.com  Thu May  7 11:39:54 2009
From: tomf.sessile at gmail.com (TomF)
Date: Thu, 7 May 2009 08:39:54 -0700
Subject: Simple way of handling errors
References: <2009050616401916807-tomfsessile@gmailcom>
	<gtu4hj$ll7$00$1@news.t-online.com>
Message-ID: <2009050708395450073-tomfsessile@gmailcom>

On 2009-05-07 01:01:57 -0700, Peter Otten <__peter__ at web.de> said:

> TomF wrote:
> 
>> As a relative newcomer to Python, I like it a lot but I'm dismayed at
>> the difficulty of handling simple errors.  In Perl if you want to
>> anticipate a file-not-found error you can simply do:
>> 
>> open($file)  or die("open($file): $!");
>> 
>> and you get an intelligible error message.  In Python, to get the same
>> thing it appears you need at least:
>> 
>> try:
>> f=open(file)
>> except IOError, err:
>> print "open(%s): got %s" % (file, err.strerror)
>> exit(-1)
>> 
>> Is there a simpler interface or idiom for handling such errors?  I
>> appreciate that Python's exception handling is much more sophisticated
>> but often I don't need it.
>> 
>> -Tom
> 
> While you are making the transition you could write
> 
> from perl_idioms import open_or_die
> 
> f = open_or_die("does-not-exist")
> 
> 
> with the perl_idioms module looking like
> 
> import sys
> 
> def open_or_die(*args):
>     try:
>         return open(*args)
>     except IOError, e:
>         sys.exit(e)
> 
> Peter

Thanks.  Rolling my own error module for common errors may be the best 
way to go.

-Tom



From nickle at gmail.com  Thu May  7 11:45:06 2009
From: nickle at gmail.com (Nick)
Date: Thu, 7 May 2009 08:45:06 -0700 (PDT)
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
Message-ID: <fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>

On May 5, 8:27?pm, Tim Golden <m... at timgolden.me.uk> wrote:
> Nick wrote:
> > Part of the problem is that the 'selection' needs to be in a config
> > file. I can put the if row['status'] != 'Cancelled': return True into
> > a config, read it and eval it, but its not quite as clean as ansql
> > route.
>
> Still not clear what the restriction is. If you were writingSQLyou'd have to read *something* from your config file,
> unless you're suggesting that the "config file" is in fact
> aSQLfile. Which is one way of doing it, but then you might
> just as well have your config file as a Python file and
> import it.
>
> Have I missed the point somewhere here? Can you give an
> example -- even a fictional one -- of what you couldn't
> do using, say, the example I gave earlier?
>
> TJG

Solution found. In the end I used SQLite to read from a csv file, and
now I can query the CSV file. The file is read using the csv module

First create a function

def fraction(p, denom):
    num, frac = p.split ('-')
    return float (num) + float (frac) / denom

for use within queries.

Now build the class.

        self.filename  = filename
        self.dialect   = dialect
        self.query     = query
        reader = csv.reader (open (filename, 'r'))
        self.connection = sqlite.connect(":memory:")
        self.connection.create_function("fraction", 2, fraction) #
Adds in function
        self.cursor = self.connection.cursor()
        first = True
        for row in reader:
            if first:
                headers = []
                for r in row:
                    n = r.strip().replace (' ', '_').replace ('-','_')
                    headers.append (n)
                command = 'create table csv (%s)' % ','.join (headers)
                self.cursor.execute (command)
                first = False
            else:
                command = 'insert into csv values ("%s")' % '","'.join
(row)
                self.cursor.execute (command)

and then I can use this

        self.cursor.execute (self.query)
        rows = self.cursor.fetchall()
        headers = []
        for r in self.cursor.description:
            headers.append (r[0])
        results = Results.Results (headers, self.name, {})
        i = 0
        for row in rows:
            results.add (row, i)
            i = i + 1
        return results

to query the results.

Results.Results is one of my classes that's reused in lots of places.

The query then looks somethign like this

                select
                    Client_Reference_Number as TrdNbr,
                    Asset_Number as ISIN,
                    Quantity as Qty,
                    status
                from
                    csv
                where status in ("CANCELLED")

                union

                select
                    Client_Reference_Number as TrdNbr,
                    Asset_Number as ISIN,
                    Quantity as Qty,
                    status
                from
                    csv
                where status not in ("CANCELLED")


All incredibly neat and the first time I've used SQLite.

nick


From lists at cheimes.de  Thu May  7 11:45:51 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 07 May 2009 17:45:51 +0200
Subject: Unable to build libpython2.5.so on OS X 10.4
In-Reply-To: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
References: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
Message-ID: <4A03022F.408@cheimes.de>

Eric Winter schrieb:
> Hi all. I'm trying to build some internal code that needs to link
> against libpython2.5.so on a OS X 10.4 (Tiger) machine. It seems that
> no matter what combination of options and environment variables I give
> to the configure script from python 2.5.1, all I get is the
> libpython2.5.a (the static library). I've googled the problem and
> searched the comp.lang.python archives, but I have been unable to find
> anything that works.
> 
> Is there some special magic I have to invoke to do this? I've not done
> any Mac development, so there may be some obvious point I am missing.
> The Python README file and configure script comments are not getting
> me very far.

You have to start with a clean plate and use the --enable-shared option
to configure:

make distclean
./configure --enable-unicode=ucs4 --enable-shared
make

That will give you a libpython2.5.dylib. The suffix for shared libraries
is .dylib on On Mac OS X, not .so!

Christian


From Scott.Daniels at Acm.Org  Thu May  7 11:53:30 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 07 May 2009 08:53:30 -0700
Subject: [RELEASED] Python 3.1 beta 1
In-Reply-To: <6f0c942f-f393-454c-b921-8eb42c5ab18d@s16g2000vbp.googlegroups.com>
References: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com>
	<mailman.5207.1241681372.11746.python-list@python.org>
	<_fKdncjfm5xjQZ_XnZ2dnUVZ_rSdnZ2d@pdx.net>
	<6f0c942f-f393-454c-b921-8eb42c5ab18d@s16g2000vbp.googlegroups.com>
Message-ID: <Qpqdnc-arrFXn57XnZ2dnUVZ_qCdnZ2d@pdx.net>

CTO wrote:
> ...
> If OrderedDict winds up being backported, will you include it
> in 2.x?

I see it in the 2.7 sources.

--Scott David Daniels
Scott.Daniels at Acm.Org


From elwinter at verizon.net  Thu May  7 11:56:50 2009
From: elwinter at verizon.net (elwinter)
Date: Thu, 7 May 2009 08:56:50 -0700 (PDT)
Subject: Unable to build libpython2.5.so on OS X 10.4
References: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
	<mailman.5223.1241711153.11746.python-list@python.org>
Message-ID: <73cd15ab-1aed-494f-b8a6-7d9c3a275ef7@o27g2000vbd.googlegroups.com>

Christian,

Thanks for the response. I knew about the .dylib suffix, but that's
not being built either, even when I supply the --enable-shared option
to configure. I also tried the --enable-unicode configure option, but
no joy. Might there be some additional OS X package I need to install
to get this to work?

Thanks,
Eric

On May 7, 11:45?am, Christian Heimes <li... at cheimes.de> wrote:
> Eric Winter schrieb:
>
> > Hi all. I'm trying to build some internal code that needs to link
> > against libpython2.5.so on a OS X 10.4 (Tiger) machine. It seems that
> > no matter what combination of options and environment variables I give
> > to the configure script from python 2.5.1, all I get is the
> > libpython2.5.a (the static library). I've googled the problem and
> > searched the comp.lang.python archives, but I have been unable to find
> > anything that works.
>
> > Is there some special magic I have to invoke to do this? I've not done
> > any Mac development, so there may be some obvious point I am missing.
> > The Python README file and configure script comments are not getting
> > me very far.
>
> You have to start with a clean plate and use the --enable-shared option
> to configure:
>
> make distclean
> ./configure --enable-unicode=ucs4 --enable-shared
> make
>
> That will give you a libpython2.5.dylib. The suffix for shared libraries
> is .dylib on On Mac OS X, not .so!
>
> Christian



From bearophileHUGS at lycos.com  Thu May  7 11:57:22 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 7 May 2009 08:57:22 -0700 (PDT)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org>
Message-ID: <7c96bd34-b199-4646-a790-4097adcc6999@q14g2000vbn.googlegroups.com>

I appreciate the tables "Infinite Iterators" and "Iterators
terminating on the shortest input sequence" at the top of the
itertools module, they are quite handy. I'd like to see similar
summary tables at the top of other docs pages too (such pages are
often quite long), for example the collections docs page.


collections.Counter and collections.OrderedDict: very nice and useful.
Is the order inside OrderedDict kept with a double linked list of the
items?


Counter.most_common([n]): a good idea.


If I need a dictionary that is both ordered and has a default too I
can't combine their qualities (but I can use the __missing__(key)
hook).


>Equality tests between OrderedDict objects are order-sensitive and are implemented as list(od1.items())==list(od2.items()). Equality tests between OrderedDict objects and other Mapping objects are order-insensitive<

very nice idea.


>The OrderedDict constructor and update() method both accept keyword arguments, but their order is lost because Python's function call semantics pass-in keyword arguments using a regular unordered dictionary.<

This is unfortunate :-(
Well, I'd like function call semantics pass-in keyword arguments to
use OrderedDicts then... :-)


>Several mathematical operations are provided for combining Counter objects to produce multisets<

Very nice.


itertools.count(): when increments are non-integer I hope the results
are computed with a multiplication instead an interated sum, to
increase precision.


Issue 4688 and the work by Antoine Pitrou: interesting GC
optimization. The performance difference of the BinaryTrees benchmark
is big.

Bye,
bearophile


From bearophileHUGS at lycos.com  Thu May  7 12:07:58 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 7 May 2009 09:07:58 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<f23ebd9d-f445-4ebf-9b87-971d3ab295f6@p4g2000vba.googlegroups.com>
Message-ID: <26f0fa28-f3d9-4549-a748-51dc00827b1d@r3g2000vbp.googlegroups.com>

Francis Carr:

I don't know who are you talking to, but I can give you few answers
anyway.

>collections of multiply-recursive functions (which get used very frequently -- by no means is it an uncommon situation, as you suggest in your initial post),<

They may be frequent in Scheme (because it's often used as an almost
pure language), but in Python code they are quite rare. I have used
two mutual recursive functions only once in non-toy Python code in two
or more years.



>Yet -- scheme does not provide out-of-the-box support for your proposed "let-a-function-implicitly- refer-to-itself" idea.  This suggests that the idea itself runs counter to more important aspects of a programming language.<

I see. It's not a very implicit thing, because you have to call a
function anyway, it's just it has a fixed name, like __func__.
I think it doesn't runs counter to Python & D languages (I have asked
for a similar feature in D2 too, and the designers seem to have
accepted the idea, already suggested there by another person in the
past).

Bye,
bearophile


From Florian.Wollenschein at FernUni-Hagen.de  Thu May  7 12:22:22 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Thu, 07 May 2009 18:22:22 +0200
Subject: hex(dummy)[2:] - issue...
In-Reply-To: <mailman.5196.1241663376.11746.python-list@python.org>
References: <gtsigt$31m$1@news-cedar.fernuni-hagen.de>
	<mailman.5196.1241663376.11746.python-list@python.org>
Message-ID: <gtv1ru$c01$1@news-cedar.fernuni-hagen.de>

Tim Chase wrote:
>> I need some advice :-)
>> I'm using hex(dummy)[2:] to represent a color in hexadecimal format 
>> for the bgcolor in an html file. dummy is the color value in RGB of 
>> course...
>>
>> Now, if there's an R, G or B value of zero, this command only prints 
>> one single 0 instead of two. What's wrong with the code?
> 
> You can try
> 
>  PLACES = 2 # 6?
>  hex(dummy)[2:].zfill(PLACES)
> 
> Alternatively, you can output decimal numbers in HTML/CSS with
> 
>   rgb(r, g, b)
> 
> such as
> 
>   style="rgb(255,0,0)"
> 
> However, I recommend doing this via CSS unless you have a strong reason 
> to sully your HTML with style information.
> 
> -tkc
> 
> 
> 
> 
> 
> 
> 

hey tkc,

I used your first alternative. This did it! Thanks a lot.
I think I will write the style stuff into a .css file in the next few 
days but until then I'm just working on get my program to work...

Listick
http://www.listick.org


From mnordhoff at mattnordhoff.com  Thu May  7 12:24:54 2009
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Thu, 07 May 2009 16:24:54 +0000
Subject: Simple way of handling errors
In-Reply-To: <pan.2009.05.07.03.38.21@REMOVE.THIS.cybersource.com.au>
References: <2009050616401916807-tomfsessile@gmailcom>	<pan.2009.05.07.02.41.28@REMOVE.THIS.cybersource.com.au>	<2009050620213875249-tomfsessile@gmailcom>
	<pan.2009.05.07.03.38.21@REMOVE.THIS.cybersource.com.au>
Message-ID: <4A030B56.5000503@mattnordhoff.com>

Steven D'Aprano wrote:
> On Wed, 06 May 2009 20:21:38 -0700, TomF wrote:
> 
>>> The only reason you would bother going to the time and effort of
>>> catching the error, printing your own error message, and then exiting,
>>> is if you explicitly want to hide the traceback from the user.
>> Well, to me, exposing the user to such raw backtraces is unprofessional,
>> which is why I try to catch user-caused errors.  But I suppose I have an
>> answer to my question.
> 
> That depends on your audience. Not every program is written to be used 
> for a technical incompetent audience. Some users actually *want* to see 
> the errors.
> 
> But certainly there are large classes of applications where you do want 
> to suppress the traceback. That's why I said "if you explicitly want to 
> hide the traceback from the user" rather than "don't do this".
> 
> The idiom I use is to wrap the *entire* application in a single 
> try...except block, and then put all your user-friendly error handling in 
> one place, instead of scattered over the entire application:
> 
> 
> try:
>     main(sys.argv[1:])
> except KeyboardInterrupt, SystemExit:

That should be:

except (KeyboardInterrupt, SystemExit):

;-D

>     raise
> except Exception, e:
>     log(e)
>     print >>sys.stderr, str(e)
>     sys.exit(1)
> 
> 
> 
> Hope this helps.
-- 


From Florian.Wollenschein at FernUni-Hagen.de  Thu May  7 12:32:03 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Thu, 07 May 2009 18:32:03 +0200
Subject: What would YOU like to see in a txt to html converter?
Message-ID: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>

As you might have mentioned I'm just working on a txt to html converter 
called "thc". This project is intended for me to learn Python and now 
pyQT4 to which I changed a few days ago (started with Tkinter).

I have implemented the following features so far:

- Giving a title for the html
- Choose whether it's Transitional or Strict Doctype
- Select a background color
- Show the converted file with the standard browser
- Working on a font size slider

I don't really know if this is of any use for anybody but it's just a 
fun project by a beginner :-)

Now I'd like to know what kind of features you'd like to see in version 
0.3 of thc!?

Please post them...

Have fun!
Listick
http://www.lictick.org


From nad at acm.org  Thu May  7 12:41:42 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 07 May 2009 12:41:42 -0400
Subject: Unable to build libpython2.5.so on OS X 10.4
References: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
Message-ID: <nad-10D4AF.12414207052009@ger.gmane.org>

In article 
<fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb at g20g2000vba.googlegroups.com>,
 Eric Winter <elwinter at verizon.net> wrote:
> Hi all. I'm trying to build some internal code that needs to link
> against libpython2.5.so on a OS X 10.4 (Tiger) machine. It seems that
> no matter what combination of options and environment variables I give
> to the configure script from python 2.5.1, all I get is the
> libpython2.5.a (the static library). I've googled the problem and
> searched the comp.lang.python archives, but I have been unable to find
> anything that works.

Perhaps I misunderstand, but if you are trying to build a C extension 
for an existing Python 2.5 installation, using Distutils from that 
installation should take care of everything for you.  Is there a 
setup.py file by any chance?  Are you using a standard python 
installation (i.e. python.org installer for instance)?  More details 
might help.

-- 
 Ned Deily,
 nad at acm.org



From apt.shansen at gmail.com  Thu May  7 12:46:11 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 7 May 2009 09:46:11 -0700
Subject: Logging exceptions to a file
In-Reply-To: <01129a12-312c-4cb9-a0f4-5a456bd9eb6a@e24g2000vbe.googlegroups.com>
References: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>
	<WUxMl.9292$y61.2903@news-server.bigpond.net.au>
	<01129a12-312c-4cb9-a0f4-5a456bd9eb6a@e24g2000vbe.googlegroups.com>
Message-ID: <7a9c25c20905070946w78822390n1ff2915663f6260@mail.gmail.com>

>
>
>  > > So far so good, but I'd like to record (possibly unhandled) exceptions
> > > in the logfile.
> > > * Do I need to explicitly trap every single exception ?
> > > * In that case, won't I get 2 log messages on the console (as
> > > illustrated in the code below:
>

Check out sys.excepthook, something vaguely like:

import sys

def handle_exceptions(exctype, value, traceback):     logging.exception("An
unhandled exception was detected.")

sys.excepthook = handle_exceptions
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From arnodel at googlemail.com  Thu May  7 12:55:11 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Thu, 07 May 2009 17:55:11 +0100
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
	<op.uti1kf0ga8ncjz@gnudebst> <1241649200.4a0210301f77e@mail.uh.cu>
	<mailman.5189.1241657949.11746.python-list@python.org>
	<pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>
	<mailman.5200.1241663550.11746.python-list@python.org>
Message-ID: <m27i0srgy8.fsf@googlemail.com>

Luis Alberto Zarrabeitia Gomez <kyrie at uh.cu> writes:

> A bit offtopic: a while ago I think I saw a recipe for a decorator
> that, via bytecode hacks, would bind otherwise global names to the
> local namespace of the function. Can anyone remember it/point me to
> it? An @bind decorator that would 'localize' all the global names,
> including the still unexistent but already know function name, would
> guarantee that at least recursion calls the same function instead of
> "whatever happens to be bound to their name at runtime". If it wasn't
> a hack, anyway.

I remember a discussion on python-ideas, and I wrote this decorator at
the time:


def new_closure(vals):
    args = ','.join('x%i' % i for i in range(len(vals)))
    f = eval("lambda %s:lambda:(%s)" % (args, args))
    return f(*vals).func_closure

def localize(f):
    f_globals = dict((n, f.func_globals[n]) for n in f.func_code.co_names)
    f_closure = ( f.func_closure and
                  new_closure([c.cell_contents for c in f.func_closure]) )
    return type(f)(f.func_code, f_globals, f.func_name,
                   f.func_defaults, f_closure)


Unfortunately it fails for recursive functions:


>>> @localize
... def fac(n):
...     return 1 if n <= 1 else n*fac(n - 1)
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "localize.py", line 7, in localize
    f_globals = dict((n, f.func_globals[n]) for n in f.func_code.co_names)
  File "localize.py", line 7, in <genexpr>
    f_globals = dict((n, f.func_globals[n]) for n in f.func_code.co_names)
KeyError: 'fac'


It can be fixed, but not very easily precisely because the function is
recursive.  I've hacked a quick way to do it below.


def reclocalize(f):
    def wrapper(*args, **kwargs):
        return recf(*args, **kwargs)
    def getglobal(name):
        return wrapper if name == f.__name__ else f.func_globals[name]
    f_globals = dict((n, getglobal(n)) for n in f.func_code.co_names)
    f_closure = ( f.func_closure and
                  new_closure([c.cell_contents for c in f.func_closure]) )
    recf = type(f)(f.func_code, f_globals, f.func_name,
                   f.func_defaults, f_closure)
    return wrapper


Now it works as intended:


>>> @reclocalize
... def fac(n):
...     return 1 if n <= 1 else n*fac(n - 1)
... 
>>> fac(10)
3628800
>>> foo = fac
>>> del fac
>>> foo(10)
3628800

-- 
Arnaud


From segfaulthunter at gmail.com  Thu May  7 12:56:16 2009
From: segfaulthunter at gmail.com (segfaulthunter)
Date: Thu, 7 May 2009 09:56:16 -0700 (PDT)
Subject: Logging exceptions to a file
References: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>
	<WUxMl.9292$y61.2903@news-server.bigpond.net.au>
	<01129a12-312c-4cb9-a0f4-5a456bd9eb6a@e24g2000vbe.googlegroups.com>
Message-ID: <5a779db4-9dd3-4b85-bda2-12bea38a1026@o27g2000vbd.googlegroups.com>

On May 7, 1:19?pm, Pierre GM <pierregmc... at gmail.com> wrote:
> On May 7, 5:32?am, Lie Ryan <lie.1... at gmail.com> wrote:
>
>
>
> > Pierre GM wrote:
> > > All,
> > > I need to log messages to both the console and a given file. I use the
> > > following code (on Python 2.5)
>
> > >>>> import logging
> > >>>> #
> > >>>> logging.basicConfig(level=logging.DEBUG,)
> > >>>> logfile = logging.FileHandler('log.log')
> > >>>> logfile.setLevel(level=logging.INFO)
> > >>>> logging.getLogger('').addHandler(logfile)
> > >>>> #
> > >>>> mylogger = logging.getLogger('mylogger')
> > >>>> #
> > >>>> mylogger.info("an info message")
>
> > > So far so good, but I'd like to record (possibly unhandled) exceptions
> > > in the logfile.
> > > * Do I need to explicitly trap every single exception ?
> > > * In that case, won't I get 2 log messages on the console (as
> > > illustrated in the code below:
> > >>>> try:
> > >>>> ? ? 1/0
> > >>>> except ZeroDivisionError:
> > >>>> ? ? mylogger.exception(":(")
> > >>>> ? ? raise
>
> > > Any comments/idea welcomed
> > > Cheers.
>
> > Although it is usually not recommended to use a catch-all except, this
> > is the case where it might be useful. JUST DON'T FORGET TO RE-RAISE THE
> > EXCEPTION.
>
> > if __name__ == '__main__':
> > ? ? ?try:
> > ? ? ? ? ?main():
> > ? ? ?except Exception, e:
> > ? ? ? ? ?# log('Unhandled Exception', e)
> > ? ? ? ? ?raise
>
> OK for a simple script, but the (unhandled) exceptions need to be
> caught at the module level. Any idea?

Override sys.excepthook. http://docs.python.org/library/sys.html#sys.excepthook


From elwinter at verizon.net  Thu May  7 12:57:09 2009
From: elwinter at verizon.net (elwinter)
Date: Thu, 7 May 2009 09:57:09 -0700 (PDT)
Subject: Unable to build libpython2.5.so on OS X 10.4
References: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
	<mailman.5224.1241714518.11746.python-list@python.org>
Message-ID: <0e05eca2-b460-4e01-aa54-cc1055f51e7d@q14g2000vbn.googlegroups.com>

Hi Ned. The Python module I am building is actually the Python module
for ROOT, a large package from CERN. However, the problem arises
before that code enters the picture, when I am building Python itself.
All I want to do is create "libpython2.5.dylib", or its equivalent,
and I can't seem to make that happen on Tiger.

Thanks,
Eric

On May 7, 12:41?pm, Ned Deily <n... at acm.org> wrote:
> In article
> <fde3b1d5-8a52-4ff1-9093-9ed470b4f... at g20g2000vba.googlegroups.com>,
> ?Eric Winter <elwin... at verizon.net> wrote:
>
> > Hi all. I'm trying to build some internal code that needs to link
> > against libpython2.5.so on a OS X 10.4 (Tiger) machine. It seems that
> > no matter what combination of options and environment variables I give
> > to the configure script from python 2.5.1, all I get is the
> > libpython2.5.a (the static library). I've googled the problem and
> > searched the comp.lang.python archives, but I have been unable to find
> > anything that works.
>
> Perhaps I misunderstand, but if you are trying to build a C extension
> for an existing Python 2.5 installation, using Distutils from that
> installation should take care of everything for you. ?Is there a
> setup.py file by any chance? ?Are you using a standard python
> installation (i.e. python.org installer for instance)? ?More details
> might help.
>
> --
> ?Ned Deily,
> ?n... at acm.org



From lhanser at gmail.com  Thu May  7 13:24:08 2009
From: lhanser at gmail.com (Lawrence Hanser)
Date: Thu, 7 May 2009 10:24:08 -0700
Subject: Wing vs Netbeans IDE?
Message-ID: <f95c22480905071024u24873e41id1f0b9b11e9592ac@mail.gmail.com>

Dear Colleagues,

I have been using NetBeans for a month or so now and am reasonably
happy with it.  I'm considering other options, and ran across Wing.
I'm interested in opinions about NetBeans and Wing as IDE for Python.

Thanks,

Larry


From james at agentultra.com  Thu May  7 13:28:10 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 07 May 2009 13:28:10 -0400
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5109.1241543371.11746.python-list@python.org>
	<85d4am8hq4.fsf@agentultra.com>
	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
Message-ID: <8563gcx1p1.fsf@agentultra.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:

> On Wed, 06 May 2009 09:48:51 -0400, J Kenneth King wrote:
>
>> Emile van Sebille <emile at fenx.com> writes:
>> 
>>> On 5/5/2009 9:15 AM J Kenneth King said...
>>>
>>>> List comprehensions can make a reader of your code apprehensive
>>>> because it can read like a run-on sentence and thus be difficult to
>>>> parse. The Python documentation discourages their use and I believe
>>>> for good reason.
>>>
>>> Can you provide a link for this?  I'd like to see specifically what's
>>> being discouraged, as I'd be surprised to find routine usage frowned
>>> upon.
>>>
>>> Emile
>> 
>> http://docs.python.org/tutorial/datastructures.html#nested-list-
> comprehensions
>> 
>> 
>> "If you?ve got the stomach for it, list comprehensions can be nested.
>> They are a powerful tool but ? like all powerful tools ? they need to be
>> used carefully, if at all."
>
> How does this discourage the use of list comprehensions? At most, it 
> warns that complicated list comps are tricky. Complicated *anything* are 
> tricky.

They are tricky and need to be used carefully, *if at all*.

IMO this means that if there's a way to do it without a nested list
comprehension, then that solution should be preferred.

>> and
>> 
>> "In real world, you should prefer builtin functions to complex flow
>> statements."
>
> That's ridiculous. The example given is a special case. That's like 
> saying "Loops are hard, so in the real world, if you want a loop, find a 
> builtin function that does what you want instead."
>
> What's the "builtin function" we're supposed to prefer over a "complex 
> flow statement" like this?

It's not ridiculous and says nothing of the sort.  You're jumping to
conclusions.  If you have a problem with it, I suggest you complain to
the Python documentation people.  I don't make this stuff up.

Just look at many of the example solutions provided in this thread to
the OP's problem. The examples in the link I provided are also good as
are ones provided in the itertools documentation.

Keep in mind that nested comprehensions are still available because
they do have a use case that justifies their existence. However, I
think the Python documentation warns against their use because people
might rely on them for problems where they aren't necessary and since
they are difficult to read... it can lead to difficult to read code.


From version5 at gmail.com  Thu May  7 13:30:18 2009
From: version5 at gmail.com (nnp)
Date: Thu, 7 May 2009 18:30:18 +0100
Subject: Wing vs Netbeans IDE?
In-Reply-To: <f95c22480905071024u24873e41id1f0b9b11e9592ac@mail.gmail.com>
References: <f95c22480905071024u24873e41id1f0b9b11e9592ac@mail.gmail.com>
Message-ID: <28749c0e0905071030p15540b99nc73b37edb72bbe9a@mail.gmail.com>

I've tried Wing but not NetBeans. I would personally recommend Eclipse
with the PyDev plugin. I prefer it to Wing by *far* and if you prefer
Eclipse to NetBeans for Java then it might be worth your while
checking it out. If you take a few minutes to learn a few of the
shortcuts in Eclipse you can really cut down the time to do a lot of
administrative/organisational tasks.

On Windows I remember Eclipse + Pydev being a bit of a memory hog but
on OS X and Linux it works smoothly.

On Thu, May 7, 2009 at 6:24 PM, Lawrence Hanser <lhanser at gmail.com> wrote:
> Dear Colleagues,
>
> I have been using NetBeans for a month or so now and am reasonably
> happy with it. ?I'm considering other options, and ran across Wing.
> I'm interested in opinions about NetBeans and Wing as IDE for Python.
>
> Thanks,
>
> Larry
> --
> http://mail.python.org/mailman/listinfo/python-list
>

-- 
http://www.unprotectedhex.com
http://www.smashthestack.org


From dotancohen at gmail.com  Thu May  7 13:35:02 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Thu, 7 May 2009 20:35:02 +0300
Subject: What would YOU like to see in a txt to html converter?
In-Reply-To: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
Message-ID: <880dece00905071035v7d7749fbj6e0ccd9907b813c8@mail.gmail.com>

> As you might have mentioned I'm just working on a txt to html converter
> called "thc". This project is intended for me to learn Python and now pyQT4
> to which I changed a few days ago (started with Tkinter).
>
> I have implemented the following features so far:
>
> - Giving a title for the html
> - Choose whether it's Transitional or Strict Doctype

Don't give this choice. What benefit does this give the user?

> - Select a background color
> - Show the converted file with the standard browser

That should probably be valid [X]HTML and be done with it.

> - Working on a font size slider

This should be a browser feature, not a page feature. Use the default
sizes of the HTML elements, and let the UA override those defaults as
the user sees fit ot configure it.

If you think that there should be a font size slider, then file a
feature request at the bug tracker of your favourite browser.

> I don't really know if this is of any use for anybody but it's just a fun
> project by a beginner :-)
>
> Now I'd like to know what kind of features you'd like to see in version 0.3
> of thc!?
>

You should probably convert the text to UTF-8 and make sure to declare
that with a meta tag.

You might want to look at markdown for a nice way to have hyperlink support.

Lists conversion, like these:
* item one
* item two
* item three

1. item one
2. item two
3. item three

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il


From nad at acm.org  Thu May  7 13:36:49 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 07 May 2009 13:36:49 -0400
Subject: Unable to build libpython2.5.so on OS X 10.4
References: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
	<mailman.5224.1241714518.11746.python-list@python.org>
	<0e05eca2-b460-4e01-aa54-cc1055f51e7d@q14g2000vbn.googlegroups.com>
Message-ID: <nad-3204F9.13364907052009@ger.gmane.org>

In article 
<0e05eca2-b460-4e01-aa54-cc1055f51e7d at q14g2000vbn.googlegroups.com>,
 elwinter <elwinter at verizon.net> wrote:
> The Python module I am building is actually the Python module
> for ROOT, a large package from CERN. However, the problem arises
> before that code enters the picture, when I am building Python itself.
> All I want to do is create "libpython2.5.dylib", or its equivalent,
> and I can't seem to make that happen on Tiger.

Any chance you can use the python.org installer for 2.5.4?  Or the 
Macports version?  They both are supported on Tiger.

<http://www.python.org/download/releases/2.5.4/>
<http://www.macports.org/>

Again, I may be missing something but libpythonx.x by itself is not very 
useful, i.e. it's not your usual standalone lib.  You'll almost 
certainly need the whole python installation.  There are a number of 
ways to build python on OS X (google will find them or ask on the Mac 
python sig) but, unless you have some special requirement, use an 
existing python installation and build the ROOT Python module with that.

-- 
 Ned Deily,
 nad at acm.org



From bjracine at glosten.com  Thu May  7 13:49:04 2009
From: bjracine at glosten.com (Benjamin J. Racine)
Date: Thu, 7 May 2009 10:49:04 -0700
Subject: Wing vs Netbeans IDE?
In-Reply-To: <f95c22480905071024u24873e41id1f0b9b11e9592ac@mail.gmail.com>
Message-ID: <B5B90D0DBF4EDC46892E8FD3602BA92A17842758@clipper.glosten.local>

I'd love to see an updated shootout between these three, as I cannot for the life of me seem to be able to settle down with one of them.

Things I don't like: 
Wing's lack of integrated mercurial/svn support.
The clunkiness and scattered plugin approach of Eclipse (the latter is relavent when starting work on new machines all the time).
Netbeans project browser doesn't show class or functions inside the files.
Netbeans autocompletion doesn't seem immediately impressive.

But...
Wing has mentioned future support of svn,git,bazaar,mercurial,etc in the future.
QT designer is integrated with Eclipse.  So is Photran, which is convenient for some of science types.
It seems that there are reasons to be optimistic about the future of netbeans.  It seems to be well put together so far, but the least mature.

I know that this comes up time and again, but I think a feature-specific debate over these might be worth revisiting for a lot of newcomers.

Ben Racine 

From donovan.parks at gmail.com  Thu May  7 14:07:33 2009
From: donovan.parks at gmail.com (Donovan Parks)
Date: Thu, 7 May 2009 15:07:33 -0300
Subject: Updating an Imported Function
Message-ID: <8fd818a30905071107h21c2eff7uad5aa177a84ff21b@mail.gmail.com>

Hello,

I'm new to Python and have what is probably a very basic question. I
am writing a helloWorld() function within a file called helloWorld.py:

def helloWorld():
	print 'hi'

Now, I can import and run this function:

import helloWorld
helloWorld.helloWorld()

Which will print 'hi' as expected. Now, I'd like to update this
function in my text editor so it is:

def helloWorld():
	print 'hello world'

Without having to exit my Python interpreter, how can I import this
revised function? If I do the import again:

import helloWorld

And run helloWorld.helloWorld() it will still print out just 'hi'.
I've tried deleting this function (a weird concept to me as I come
from a C++ background) using del helloWorld and than importing again,
but the function will still print out just 'hi'.

Can this be done? How so?

Thanks for any and all help.

Cheers,
Donovan


From norseman at hughes.net  Thu May  7 14:13:27 2009
From: norseman at hughes.net (norseman)
Date: Thu, 07 May 2009 11:13:27 -0700
Subject: What would YOU like to see in a txt to html converter?
In-Reply-To: <880dece00905071035v7d7749fbj6e0ccd9907b813c8@mail.gmail.com>
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
	<880dece00905071035v7d7749fbj6e0ccd9907b813c8@mail.gmail.com>
Message-ID: <4A0324C7.9090708@hughes.net>

Dotan Cohen wrote:
>> As you might have mentioned I'm just working on a txt to html converter
>> called "thc". This project is intended for me to learn Python and now pyQT4
>> to which I changed a few days ago (started with Tkinter).
>>
>> I have implemented the following features so far:
>>
>> - Giving a title for the html
>> - Choose whether it's Transitional or Strict Doctype
> 
> Don't give this choice. What benefit does this give the user?
> 
>> - Select a background color
>> - Show the converted file with the standard browser
> 
> That should probably be valid [X]HTML and be done with it.
> 
>> - Working on a font size slider
> 
> This should be a browser feature, not a page feature. Use the default
> sizes of the HTML elements, and let the UA override those defaults as
> the user sees fit ot configure it.
> 
> If you think that there should be a font size slider, then file a
> feature request at the bug tracker of your favourite browser.
> 
>> I don't really know if this is of any use for anybody but it's just a fun
>> project by a beginner :-)
>>
>> Now I'd like to know what kind of features you'd like to see in version 0.3
>> of thc!?
>>
> 
> You should probably convert the text to UTF-8 and make sure to declare
> that with a meta tag.
> 
> You might want to look at markdown for a nice way to have hyperlink support.
> 
> Lists conversion, like these:
> * item one
> * item two
> * item three
> 
> 1. item one
> 2. item two
> 3. item three
> 
================================
Actually I would like to see a good HTML to txt or odt converter. 
Perhaps someone you know has the time and inclination to make one.
In Unix, grep is a fantastic search tool.  Since HTML's today seem to be 
one page one file, trying to search a "help collection" for a phrase is 
useless in the practical sense.

I mean no offense to your effort. There are many who wish a good version 
of such a converter.  It's just that I personally wish HTMLs used for 
Help and Documentation were banned from the universe. To me, a well 
written, easily understood, no frills, fully grep'able text file that 
covers the subject well is a truly fantastic thing to be well cherished.


Steve


From allenreas at gmail.com  Thu May  7 14:19:36 2009
From: allenreas at gmail.com (AllenLars)
Date: Thu, 7 May 2009 11:19:36 -0700 (PDT)
Subject: Downloading most recently modified files
Message-ID: <23432457.post@talk.nabble.com>


I am trying to code a script that will allow me to go to ftp site and
download files based on most recently modified file (date, time).  I am
brand new to programming.  Any and all help is appreciated.
-- 
View this message in context: http://www.nabble.com/Downloading-most-recently-modified-files-tp23432457p23432457.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From cnbrat.at.gmail at dot.com.no.spam  Thu May  7 14:22:57 2009
From: cnbrat.at.gmail at dot.com.no.spam (Will Wang)
Date: Fri, 08 May 2009 02:22:57 +0800
Subject: What would YOU like to see in a txt to html converter?
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
Message-ID: <87my9okc1q.fsf@lakeside.sjtu.edu.cn>

>>>>> "Florian" == Florian Wollenschein <Florian.Wollenschein at FernUni-Hagen.de> writes:

    Florian> As you might have mentioned I'm just working on a txt to html converter called
    Florian> "thc". This project is intended for me to learn Python and now pyQT4 to which I
    Florian> changed a few days ago (started with Tkinter).

    Florian> I have implemented the following features so far:

    Florian> - Giving a title for the html
    Florian> - Choose whether it's Transitional or Strict Doctype
    Florian> - Select a background color
    Florian> - Show the converted file with the standard browser
    Florian> - Working on a font size slider

    Florian> I don't really know if this is of any use for anybody but it's just a fun
    Florian> project by a beginner :-)

    Florian> Now I'd like to know what kind of features you'd like to see in version 0.3 of
    Florian> thc!?

    Florian> Please post them...

    Florian> Have fun!
    Florian> Listick
    Florian> http://www.lictick.org

You could learn something from emacs-muse. That plugin can help emacs to
convert txt to html, tex, pdf, docbook and some other document format.

In emacs-muse, the title and subtitle is defined like this:

*emphasis*
**strong emphasis**
***very strong emphasis***
_underlined_
=verbatim and monospace=

emacs-muse : http://mwolson.org/projects/EmacsMuse.html


From deets at nospam.web.de  Thu May  7 14:23:21 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 20:23:21 +0200
Subject: P2P text chat engine
In-Reply-To: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>
References: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>
Message-ID: <76gn8qF1cliefU1@mid.uni-berlin.de>

Navanjo schrieb:
> If you have the source code of a p2p text chat engine please send to me

I found that & a pot of gold under my bed. Care to give me your address 
so that I can send it to you?

SCNR,
Diez


From deets at nospam.web.de  Thu May  7 14:25:56 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 20:25:56 +0200
Subject: Updating an Imported Function
In-Reply-To: <mailman.5231.1241719678.11746.python-list@python.org>
References: <mailman.5231.1241719678.11746.python-list@python.org>
Message-ID: <76gndkF1cliefU2@mid.uni-berlin.de>

Donovan Parks schrieb:
> Hello,
> 
> I'm new to Python and have what is probably a very basic question. I
> am writing a helloWorld() function within a file called helloWorld.py:
> 
> def helloWorld():
> 	print 'hi'
> 
> Now, I can import and run this function:
> 
> import helloWorld
> helloWorld.helloWorld()
> 
> Which will print 'hi' as expected. Now, I'd like to update this
> function in my text editor so it is:
> 
> def helloWorld():
> 	print 'hello world'
> 
> Without having to exit my Python interpreter, how can I import this
> revised function? If I do the import again:
> 
> import helloWorld
> 
> And run helloWorld.helloWorld() it will still print out just 'hi'.
> I've tried deleting this function (a weird concept to me as I come
> from a C++ background) using del helloWorld and than importing again,
> but the function will still print out just 'hi'.
> 
> Can this be done? How so?

reload(helloWorld)

But there are some caveats, and IMHO reloading isn't worth the trouble - 
it is *so* easy to write a second script, test.py or whatever, that  you 
just call from a shell. And this has the added benefit that you can 
create even somewhat more elaborate toy-code.

If one wants to play around with objects created, either do

python -i test.py

or try to use pdb, the python debugger, through

import pdb; pdb.set_trace()

to get an interactive prompt at whatever point you want.

Diez


From pavlovevidence at gmail.com  Thu May  7 14:26:37 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 7 May 2009 11:26:37 -0700 (PDT)
Subject: Threading and GIL
References: <60538e1c-47ea-4120-bc91-a9dcebd8f14b@r34g2000vbi.googlegroups.com>
	<a8f972ee-4594-493d-8b53-4a037c0211c0@n4g2000vba.googlegroups.com> 
	<e352ad10-c812-4218-a7db-bc5a6aeef2d4@e23g2000vbe.googlegroups.com>
Message-ID: <72ecd73c-2e6b-4a2a-85fc-e6dd8f8a591a@o27g2000vbd.googlegroups.com>

On May 7, 12:20?am, googler.1.webmas... at spamgourmet.com wrote:
> thats the reason why its not working. Imagine the end() method of the
> thread object is called so the C++ Function is opened where the code
> for this method is in.

You're going to have to post some code if you want better help; this
description is unintelligible.  I don't know what you mean by end()
method, nor whether it's a Python method or C++ method, nor what
exactly you mean by thread object (C++ or Python object?) or C++
Function.


> At a line the Code ...->End() is called which waits that the C++
> Thread class
> is finished. BUT here is the problem: In the Method of the C++ class
> which is in threaded mode can't run because its still waiting that the
> GIL
> is released by the thread which executed the ->End() command.
>
> So the app has a deadlock when it arrives at       ->End() and
> PyGILState_Ensure
> function.

So you have to release the GIL before calling End().  Just surround End
() by Py_BEGIN_ALLOW_THREADS and Py_END_ALLOW_THREADS.  (Presumably
you know the thread state when you call End(); if you don't then
surround the calls to Py_{BEGIN,END}_ALLOW_THREADS with calls to
PyGILState_{Ensure,Release}.  Yes, that means you acquire the GIL just
so you can be sure that you've released it.  I know of no other way to
be sure you don't have the GIL.)

If you are trying to kill a different thread, and I can't quite tell
if that's what you're doing, then be aware that it is very tricky to
do right and most think it to be a bad idea.  If you don't allow the
thread you're killing to clean up it can deadlock, and even if you do,
you have to be careful to clean up properly and you have to be
constantly on guard for what might happen in a thread is killed in the
middle of something.


Carl Banks


From Florian.Wollenschein at FernUni-Hagen.de  Thu May  7 14:33:56 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Thu, 07 May 2009 20:33:56 +0200
Subject: What would YOU like to see in a txt to html converter?
In-Reply-To: <87my9okc1q.fsf@lakeside.sjtu.edu.cn>
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
	<87my9okc1q.fsf@lakeside.sjtu.edu.cn>
Message-ID: <gtv9ik$qes$1@news-cedar.fernuni-hagen.de>

Will Wang wrote:
>>>>>> "Florian" == Florian Wollenschein <Florian.Wollenschein at FernUni-Hagen.de> writes:
> 
>     Florian> As you might have mentioned I'm just working on a txt to html converter called
>     Florian> "thc". This project is intended for me to learn Python and now pyQT4 to which I
>     Florian> changed a few days ago (started with Tkinter).
> 
>     Florian> I have implemented the following features so far:
> 
>     Florian> - Giving a title for the html
>     Florian> - Choose whether it's Transitional or Strict Doctype
>     Florian> - Select a background color
>     Florian> - Show the converted file with the standard browser
>     Florian> - Working on a font size slider
> 
>     Florian> I don't really know if this is of any use for anybody but it's just a fun
>     Florian> project by a beginner :-)
> 
>     Florian> Now I'd like to know what kind of features you'd like to see in version 0.3 of
>     Florian> thc!?
> 
>     Florian> Please post them...
> 
>     Florian> Have fun!
>     Florian> Listick
>     Florian> http://www.lictick.org
> 
> You could learn something from emacs-muse. That plugin can help emacs to
> convert txt to html, tex, pdf, docbook and some other document format.
> 
> In emacs-muse, the title and subtitle is defined like this:
> 
> *emphasis*
> **strong emphasis**
> ***very strong emphasis***
> _underlined_
> =verbatim and monospace=
> 
> emacs-muse : http://mwolson.org/projects/EmacsMuse.html

Thank you for this information. I already thought of using dots or 
asterisks or whatever to let the user format the text instead of using 
html tags (this would be quite paradox ;-)

Please keep on posting ideas...

Thanks again,
Listick
http://www.listick.org


From alan.cameron at iname.com  Thu May  7 14:35:07 2009
From: alan.cameron at iname.com (Alan Cameron)
Date: Thu, 7 May 2009 19:35:07 +0100
Subject: Newcomer to Python tutorial question
Message-ID: <hRFMl.50224$tb.4955@newsfe07.ams2>

I am not sure of this is the right place to ask a question about the 
tutorial

http://docs.python.org/3.0/tutorial/datastructures.html#sets

why is the printed result of

>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>> print(basket)
{'orange', 'banana', 'pear', 'apple'}

in the sequence given?

-- 
Alan Cameron 




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Date: Thu, 7 May 2009 11:38:04 -0700 (PDT)
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From clp2 at rebertia.com  Thu May  7 14:40:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 7 May 2009 11:40:57 -0700
Subject: Newcomer to Python tutorial question
In-Reply-To: <hRFMl.50224$tb.4955@newsfe07.ams2>
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
Message-ID: <50697b2c0905071140m3978dfa9x6b320e8a3f9d28ee@mail.gmail.com>

On Thu, May 7, 2009 at 11:35 AM, Alan Cameron <alan.cameron at iname.com>
wrote> I am not sure of this is the right place to ask a question
about the
> tutorial
>
> http://docs.python.org/3.0/tutorial/datastructures.html#sets
>
> why is the printed result of
>
>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>> print(basket)
> {'orange', 'banana', 'pear', 'apple'}
>
> in the sequence given?

Because it's *not a sequence* at all, it's a set. Sets are unordered
and contain no duplicate items, hence why the output ordering is
arbitrary and only the unique subset of original elements is present.

Further info: http://docs.python.org/3.0/library/stdtypes.html#set-types-set-frozenset

Cheers,
Chris
-- 
http://blog.rebertia.com


From Florian.Wollenschein at FernUni-Hagen.de  Thu May  7 14:42:20 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Thu, 07 May 2009 20:42:20 +0200
Subject: Newcomer to Python tutorial question
In-Reply-To: <hRFMl.50224$tb.4955@newsfe07.ams2>
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
Message-ID: <gtva2b$10k$1@news-cedar.fernuni-hagen.de>

Alan Cameron wrote:
> I am not sure of this is the right place to ask a question about the 
> tutorial
> 
> http://docs.python.org/3.0/tutorial/datastructures.html#sets
> 
> why is the printed result of
> 
>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>> print(basket)
> {'orange', 'banana', 'pear', 'apple'}
> 
> in the sequence given?
> 

A set is not ordered and eliminates duplicate elements. So the output is 
random in terms of the order and only shows each single item once...

Correct me if I'm wrong :-)

Listick
http://www.listick.org


From arnodel at googlemail.com  Thu May  7 14:43:08 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Thu, 07 May 2009 19:43:08 +0100
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
Message-ID: <m23abgrbyb.fsf@googlemail.com>

"Alan Cameron" <alan.cameron at iname.com> writes:

> I am not sure of this is the right place to ask a question about the 
> tutorial
>
> http://docs.python.org/3.0/tutorial/datastructures.html#sets
>
> why is the printed result of
>
>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>> print(basket)
> {'orange', 'banana', 'pear', 'apple'}
>
> in the sequence given?

A set is an unordered container, but due to the nature of an object
representation (which is a sequence of characters), its representation
has to list the elements in a certain order.  However, this order is not
significant.

-- 
Arnaud


From news123 at free.fr  Thu May  7 14:56:13 2009
From: news123 at free.fr (News123)
Date: Thu, 07 May 2009 20:56:13 +0200
Subject: What would YOU like to see in a txt to html converter?
In-Reply-To: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
Message-ID: <4a032ece$0$4849$426a74cc@news.free.fr>

Florian Wollenschein wrote:
> As you might have mentioned I'm just working on a txt to html converter
> called "thc". This project is intended for me to learn Python and now
> pyQT4 to which I changed a few days ago (started with Tkinter).
> 
> I have implemented the following features so far:
> 
> - Giving a title for the html
> - Choose whether it's Transitional or Strict Doctype
> - Select a background color
> - Show the converted file with the standard browser
> - Working on a font size slider
> 
> I don't really know if this is of any use for anybody but it's just a
> fun project by a beginner :-)
> 
> Now I'd like to know what kind of features you'd like to see in version
> 0.3 of thc!?
> 
> Please post them...
> 
> Have fun!
> Listick
> http://www.lictick.org

I would first think about your personal requirements / use cases.
What kind of texts do you want to convert?

I think there's already quite some text to html converters, which you
could take as inspiration.
Most of them were written for a specific purpose though and started from
text files with some 'formatting syntax'

Exanples:
man2html   converts man pages to html
pod2html   covnerts perl online documentation to html

There's also converters from certain wiki formats to html.

There's also source code formatters for certain programming languages
or log file to html converters which color certain message types


If it is just for plain text with no special formattings,
then you need probably only:
- escape all characters, which have to be escap for html. (but there is
probably already a function for it.
)
- seperate paragraphs (at double new lines or at single new lines. This
could be an option)

- additionally you could allow to specify a html prefix (before the
converted text) and a html post fix after the converted text.

- I would handle settings lik color / font size etc with style sheets
and not within the generated html. If you want you could autgenerate
style sheets from some function arguments. They could contain Font color
/ background color / font formatting . . . .

- you could add a configuration, that automatically tags certain words
with certain tags, to allow simle keyword hihglighting.


It all depends on your use case.







From alan.cameron at iname.com  Thu May  7 14:58:34 2009
From: alan.cameron at iname.com (Alan Cameron)
Date: Thu, 7 May 2009 19:58:34 +0100
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
Message-ID: <fbGMl.6972$hd4.4032@newsfe24.ams2>

"Alan Cameron" <alan.cameron at iname.com> wrote in message 
news:hRFMl.50224$tb.4955 at newsfe07.ams2...
>I am not sure of this is the right place to ask a question about the 
>tutorial
>
> http://docs.python.org/3.0/tutorial/datastructures.html#sets
>
> why is the printed result of
>
>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>> print(basket)
> {'orange', 'banana', 'pear', 'apple'}
>
> in the sequence given?
>
>

Thanks to all who replied.
I assume therefore that the order in which the items of the set are printed 
could vary each time it is printed?


-- 
Alan Cameron 




From __peter__ at web.de  Thu May  7 14:58:49 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 07 May 2009 20:58:49 +0200
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
Message-ID: <gtvb14$bv8$02$1@news.t-online.com>

Alan Cameron wrote:

> I am not sure of this is the right place to ask a question about the
> tutorial
> 
> http://docs.python.org/3.0/tutorial/datastructures.html#sets
> 
> why is the printed result of
> 
>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>> print(basket)
> {'orange', 'banana', 'pear', 'apple'}
> 
> in the sequence given?

As already said by others, the order of items in a set is not part of the 
concept of a set. 

You can even have sets with equal contents that display differently:

Python 3.0.1+ (r301:69556, Apr 15 2009, 17:25:52)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> a = {'orange', 'banana', 'apple', 'orange', 'pear', 'apple'}
>>> b = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>> a == b
True
>>> repr(a) == repr(b)
False
>>> a
{'orange', 'pear', 'apple', 'banana'}
>>> b
{'orange', 'pear', 'banana', 'apple'}

Peter



From amrbekhit at gmail.com  Thu May  7 15:04:18 2009
From: amrbekhit at gmail.com (Amr)
Date: Thu, 7 May 2009 12:04:18 -0700 (PDT)
Subject: Could this expression parser be more 'Pythonic'?
References: <e8f3a550-647b-4ce2-bae3-c160e42e5439@j12g2000vbl.googlegroups.com>
	<b8f53ce0-1bd5-4eb9-a7dd-d9df2b8b5ed9@d19g2000prh.googlegroups.com>
Message-ID: <b72f6d6f-e1e3-47fe-973e-80be92e29c9c@r13g2000vbr.googlegroups.com>

Hi John,

Thanks for the tips, I will check them out.

--Amr


From stefan_ml at behnel.de  Thu May  7 15:05:10 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 07 May 2009 21:05:10 +0200
Subject: What would YOU like to see in a txt to html converter?
In-Reply-To: <gtv9ik$qes$1@news-cedar.fernuni-hagen.de>
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
	<87my9okc1q.fsf@lakeside.sjtu.edu.cn>
	<gtv9ik$qes$1@news-cedar.fernuni-hagen.de>
Message-ID: <4a0330e6$0$30238$9b4e6d93@newsspool1.arcor-online.net>

Florian Wollenschein wrote:
> Will Wang wrote:
>> *emphasis*
>> **strong emphasis**
>> ***very strong emphasis***
>> _underlined_
>> =verbatim and monospace=
>>
>> emacs-muse : http://mwolson.org/projects/EmacsMuse.html
> 
> Thank you for this information. I already thought of using dots or
> asterisks or whatever to let the user format the text instead of using
> html tags (this would be quite paradox ;-)

First thing I'd look at is actually docutils' RestructuredText (ReST).

Stefan


From clp2 at rebertia.com  Thu May  7 15:08:51 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 7 May 2009 12:08:51 -0700
Subject: Newcomer to Python tutorial question
In-Reply-To: <fbGMl.6972$hd4.4032@newsfe24.ams2>
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
	<fbGMl.6972$hd4.4032@newsfe24.ams2>
Message-ID: <50697b2c0905071208q1fd88762xd007706f11b8a829@mail.gmail.com>

On Thu, May 7, 2009 at 11:58 AM, Alan Cameron <alan.cameron at iname.com> wrote:
> "Alan Cameron" <alan.cameron at iname.com> wrote in message
> news:hRFMl.50224$tb.4955 at newsfe07.ams2...
>>I am not sure of this is the right place to ask a question about the
>>tutorial
>>
>> http://docs.python.org/3.0/tutorial/datastructures.html#sets
>>
>> why is the printed result of
>>
>>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>>> print(basket)
>> {'orange', 'banana', 'pear', 'apple'}
>>
>> in the sequence given?
>>
>>
>
> Thanks to all who replied.
> I assume therefore that the order in which the items of the set are printed
> could vary each time it is printed?

Due to the underlying dict-based implementation, the order will stay
the same until you modify the set (i.e. add or remove an element), at
which point it may change; it's basically the same behavior as with
printing a dict.

So this will always print the same thing twice:
print basket
print basket

Whereas this might not:
print basket
#modify the set
basket.discard("banana")
basket.add("banana")
print basket

Cheers,
Chris
-- 
http://blog.rebertia.com


From jcd at sdf.lonestar.org  Thu May  7 15:10:38 2009
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Thu, 07 May 2009 15:10:38 -0400
Subject: Wing vs Netbeans IDE?
In-Reply-To: <B5B90D0DBF4EDC46892E8FD3602BA92A17842758@clipper.glosten.local>
References: <B5B90D0DBF4EDC46892E8FD3602BA92A17842758@clipper.glosten.local>
Message-ID: <1241723438.22531.31.camel@mctell>

On Thu, 2009-05-07 at 10:49 -0700, Benjamin J. Racine wrote:
> I'd love to see an updated shootout between these three, as I cannot for the life of me seem to be able to settle down with one of them.
> 
> Things I don't like: 
> Wing's lack of integrated mercurial/svn support.

Wing *does* have integrated SVN support already, but nothing for the
distributed systems yet.  I just purchased a Wing license this past
week.  So far I'm very happy with it, though I can't speak to a
comparison with other IDEs. 






From __peter__ at web.de  Thu May  7 15:14:07 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 07 May 2009 21:14:07 +0200
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
	<fbGMl.6972$hd4.4032@newsfe24.ams2>
Message-ID: <gtvbtq$dpi$02$1@news.t-online.com>

Alan Cameron wrote:

> "Alan Cameron" <alan.cameron at iname.com> wrote in message
> news:hRFMl.50224$tb.4955 at newsfe07.ams2...
>>I am not sure of this is the right place to ask a question about the
>>tutorial
>>
>> http://docs.python.org/3.0/tutorial/datastructures.html#sets
>>
>> why is the printed result of
>>
>>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>>> print(basket)
>> {'orange', 'banana', 'pear', 'apple'}
>>
>> in the sequence given?
>>
>>
> 
> Thanks to all who replied.
> I assume therefore that the order in which the items of the set are
> printed could vary each time it is printed?

If you don't add or remove items the printed order will not change in the 
current implementation. But as shown in my other post it is possible to 
create sets with equal contents that are printed differently. The actual 
order depends on the set's history of insertions/deletions, so it is not 
truly random. 

But these are implementation details that may change across versions of 
python and your code should never rely on them. If you want a defined order 
convert the set to a sorted list before printing:

>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>> sorted(basket)
['apple', 'banana', 'orange', 'pear']

Peter



From alan.cameron at iname.com  Thu May  7 15:15:44 2009
From: alan.cameron at iname.com (Alan Cameron)
Date: Thu, 7 May 2009 20:15:44 +0100
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2><fbGMl.6972$hd4.4032@newsfe24.ams2>
	<mailman.5238.1241723354.11746.python-list@python.org>
Message-ID: <lrGMl.6973$hd4.2539@newsfe24.ams2>

"Chris Rebert" <clp2 at rebertia.com> wrote in message 
news:mailman.5238.1241723354.11746.python-list at python.org...
> On Thu, May 7, 2009 at 11:58 AM, Alan Cameron <alan.cameron at iname.com> 
> wrote:
>> "Alan Cameron" <alan.cameron at iname.com> wrote in message
>> news:hRFMl.50224$tb.4955 at newsfe07.ams2...
>>>I am not sure of this is the right place to ask a question about the
>>>tutorial
>>>
>>> http://docs.python.org/3.0/tutorial/datastructures.html#sets
>>>
>>> why is the printed result of
>>>
>>>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>>>> print(basket)
>>> {'orange', 'banana', 'pear', 'apple'}
>>>
>>> in the sequence given?
>>>
>>>
>>
>> Thanks to all who replied.
>> I assume therefore that the order in which the items of the set are 
>> printed
>> could vary each time it is printed?
>
> Due to the underlying dict-based implementation, the order will stay
> the same until you modify the set (i.e. add or remove an element), at
> which point it may change; it's basically the same behavior as with
> printing a dict.
>
> So this will always print the same thing twice:
> print basket
> print basket
>
> Whereas this might not:
> print basket
> #modify the set
> basket.discard("banana")
> basket.add("banana")
> print basket
>
> Cheers,
> Chris

Thanks Chris,

It appears that I used a reserved term when I used 'sequence'. I just had 
not reached that far in the tutorial.
I have many years of programming (roughly 50) and want to learn new 
languages.
I find tutorials always fraught with problems due to the knowledge of the 
writer exceeding the knowledge of the reader and using terms and examples 
not yet covered in the tutorial thus far.
I am persevering with my initial foray into Python.

-- 
Alan Cameron 




From googler.1.webmaster at spamgourmet.com  Thu May  7 15:27:00 2009
From: googler.1.webmaster at spamgourmet.com (googler.1.webmaster at spamgourmet.com)
Date: Thu, 7 May 2009 12:27:00 -0700 (PDT)
Subject: Threading and GIL
References: <60538e1c-47ea-4120-bc91-a9dcebd8f14b@r34g2000vbi.googlegroups.com>
	<a8f972ee-4594-493d-8b53-4a037c0211c0@n4g2000vba.googlegroups.com> 
	<e352ad10-c812-4218-a7db-bc5a6aeef2d4@e23g2000vbe.googlegroups.com> 
	<72ecd73c-2e6b-4a2a-85fc-e6dd8f8a591a@o27g2000vbd.googlegroups.com>
Message-ID: <7a659f98-47c3-45f8-b29d-ab3944a2ebb4@s31g2000vbp.googlegroups.com>

hey, thanks, that works fine. I wrapped it around, done a lot of tests
and it works fine.
Just had done a few other things to make it stable.

cheers.


From pruebauno at latinmail.com  Thu May  7 15:47:37 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Thu, 7 May 2009 12:47:37 -0700 (PDT)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org>
Message-ID: <b698a5bf-d43c-412a-a5ee-3753ca31122b@z5g2000vba.googlegroups.com>

On May 6, 9:32?pm, Benjamin Peterson <benja... at python.org> wrote:
> On behalf of the Python development team, I'm thrilled to announce the first and
> only beta release of Python 3.1.
>
> Python 3.1 focuses on the stabilization and optimization of features and changes
> Python 3.0 introduced. ?For example, the new I/O system has been rewritten in C
> for speed. ?File system APIs that use unicode strings now handle paths with
> undecodable bytes in them. [1] Other features include an ordered dictionary
> implementation and support for ttk Tile in Tkinter. ?For a more extensive list
> of changes in 3.1, seehttp://doc.python.org/dev/py3k/whatsnew/3.1.htmlor
> Misc/NEWS in the Python distribution.
>
> Please note that this is a beta release, and as such is not suitable for
> production environments. ?We continue to strive for a high degree of quality,
> but there are still some known problems and the feature sets have not been
> finalized. ?This beta is being released to solicit feedback and hopefully
> discover bugs, as well as allowing you to determine how changes in 3.1 might
> impact you. ?If you find things broken or incorrect, please submit a bug report
> at
>
> ? ?http://bugs.python.org
>
> For more information and downloadable distributions, see the Python 3.1 website:
>
> ? ?http://www.python.org/download/releases/3.1/
>
> See PEP 375 for release schedule details:
>
> ? ?http://www.python.org/dev/peps/pep-0375/
>
> Enjoy,
> -- Benjamin
>
> Benjamin Peterson
> benjamin at python.org
> Release Manager
> (on behalf of the entire python-dev team and 3.1's contributors)


Congratulations!

Is it just me or was some nice summary output added to the make
process? I get a nice list of modules that didn't compile and the ones
where the library could not be found.


From OldGrantonian at googlemail.com  Thu May  7 15:53:38 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Thu, 7 May 2009 12:53:38 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com> 
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com> 
	<Xns9C047FE3D4338duncanbooth@127.0.0.1>
Message-ID: <3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>

On May 7, 12:34?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> OldGrantonian <OldGranton... at googlemail.com> wrote:
> > Thanks to both Steven D'Aprano and Ant :)
>
> >>> ?Sounds like you've downloaded the Python 2.5 version of Easy Install.
>
> > There's no Python 2.6 version of EasyInstall :(
>
> I wonder what I've been running then?
>
>
>
> > For 2.5, there is:
>
> > setuptools-0.6c9.win32-py2.5.exe
>
> > But for 2.6, it's:
>
> > setuptools-0.6c9-py2.6.egg
>
> > For any other egg file, I would use EasyInstall, but I don't think I
> > can use EasyInstall to install EasyInstall :)
>
> No, but you can use ez_setup.
>
> Go tohttp://peak.telecommunity.com/dist/ez_setup.pyand save the content
> of that file as ez_setup.py (cut and paste into your favourite editor may
> be the simplest way) then run it with your chosen Python. It will find and
> install the appropriate version of easy install.
>
> --
> Duncan Boothhttp://kupuguy.blogspot.com


ez_setup worked fine. Thanks for that :)

According to the web site:

http://pypi.python.org/pypi/virtualenv

the next step is to do:

virtualenv ENV

If I do that, I get the following message:

--------------------------------

C:\Python26\Scripts>virtualenv ENV
Traceback (most recent call last):
  File "C:\Python26\Scripts\virtualenv-script.py", line 8, in <module>
    load_entry_point('virtualenv==1.3.3', 'console_scripts',
'virtualenv')()
  File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
\virtualenv.py", line 420
    unzip_setuptools=options.unzip_setuptools)
  File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
\virtualenv.py", line 499
    home_dir, lib_dir, inc_dir, bin_dir = path_locations(home_dir)
  File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
\virtualenv.py", line 521
    import win32api
ImportError: No module named win32api

C:\Python26\Scripts>

--------------------------------

Any advice?


From piet at cs.uu.nl  Thu May  7 15:53:46 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Thu, 07 May 2009 21:53:46 +0200
Subject: Unable to build libpython2.5.so on OS X 10.4
References: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
	<mailman.5224.1241714518.11746.python-list@python.org>
	<0e05eca2-b460-4e01-aa54-cc1055f51e7d@q14g2000vbn.googlegroups.com>
Message-ID: <m24ovwlmet.fsf@cs.uu.nl>

>>>>> elwinter <elwinter at verizon.net> (e) wrote:

>e> Hi Ned. The Python module I am building is actually the Python module
>e> for ROOT, a large package from CERN. However, the problem arises
>e> before that code enters the picture, when I am building Python itself.
>e> All I want to do is create "libpython2.5.dylib", or its equivalent,
>e> and I can't seem to make that happen on Tiger.

The standard installer for Python 2.5.4 when installed on Tiger, will
contain a file libpython2.5.a which is a symbolic link to
/Library/Frameworks/Python.framework/Versions/2.5/Python, which
according to the file command, is a shared library. So it is not a
static library, despite of its name!
>e> Thanks,
>e> Eric

>e> On May 7, 12:41?pm, Ned Deily <n... at acm.org> wrote:
>>> In article
>>> <fde3b1d5-8a52-4ff1-9093-9ed470b4f... at g20g2000vba.googlegroups.com>,
>>> ?Eric Winter <elwin... at verizon.net> wrote:
>>> 
>>> > Hi all. I'm trying to build some internal code that needs to link
>>> > against libpython2.5.so on a OS X 10.4 (Tiger) machine. It seems that
>>> > no matter what combination of options and environment variables I give
>>> > to the configure script from python 2.5.1, all I get is the
>>> > libpython2.5.a (the static library). I've googled the problem and
>>> > searched the comp.lang.python archives, but I have been unable to find
>>> > anything that works.
>>> 
>>> Perhaps I misunderstand, but if you are trying to build a C extension
>>> for an existing Python 2.5 installation, using Distutils from that
>>> installation should take care of everything for you. ?Is there a
>>> setup.py file by any chance? ?Are you using a standard python
>>> installation (i.e. python.org installer for instance)? ?More details
>>> might help.
>>> 
>>> --
>>> ?Ned Deily,
>>> ?n... at acm.org


-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From rent.lupin.road at gmail.com  Thu May  7 15:59:50 2009
From: rent.lupin.road at gmail.com (James)
Date: Thu, 7 May 2009 12:59:50 -0700 (PDT)
Subject: Best practice for operations on streams of text
Message-ID: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>

Hello all,
I'm working on some NLP code - what I'm doing is passing a large
number of tokens through a number of filtering / processing steps.

The filters take a token as input, and may or may not yield a token as
a result. For example, I might have filters which lowercases the
input, filter out boring words and filter out duplicates chained
together.

I originally had code like this:
for t0 in token_stream:
  for t1 in lowercase_token(t0):
    for t2 in remove_boring(t1):
      for t3 in remove_dupes(t2):
        yield t3

Apart from being ugly as sin, I only get one token out as
StopIteration is raised before the whole token stream is consumed.

Any suggestions on an elegant way to chain together a bunch of
generators, with processing steps in between?

Thanks,
James


From emile at fenx.com  Thu May  7 16:01:11 2009
From: emile at fenx.com (Emile van Sebille)
Date: Thu, 07 May 2009 13:01:11 -0700
Subject: P2P text chat engine
In-Reply-To: <76gn8qF1cliefU1@mid.uni-berlin.de>
References: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>
	<76gn8qF1cliefU1@mid.uni-berlin.de>
Message-ID: <gtveil$qk7$1@ger.gmane.org>

On 5/7/2009 11:23 AM Diez B. Roggisch said...
> Navanjo schrieb:
>> If you have the source code of a p2p text chat engine please send to me
> 
> I found that & a pot of gold under my bed. Care to give me your address 
> so that I can send it to you?
> 

Yeah -- this is how it starts.  Before too long you'll need my bank 
account info to facilitate the transfer...

:)

Emile



From emile at fenx.com  Thu May  7 16:03:27 2009
From: emile at fenx.com (Emile van Sebille)
Date: Thu, 07 May 2009 13:03:27 -0700
Subject: Which python version do I use with "virtualenv"?
In-Reply-To: <3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com>
	<Xns9C047FE3D4338duncanbooth@127.0.0.1>
	<3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>
Message-ID: <gtvems$qk7$2@ger.gmane.org>

On 5/7/2009 12:53 PM OldGrantonian said...
> On May 7, 12:34 pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
>> OldGrantonian <OldGranton... at googlemail.com> wrote:
>>> Thanks to both Steven D'Aprano and Ant :)
>>>>>  Sounds like you've downloaded the Python 2.5 version of Easy Install.
>>> There's no Python 2.6 version of EasyInstall :(
>> I wonder what I've been running then?
>>
>>
>>
>>> For 2.5, there is:
>>> setuptools-0.6c9.win32-py2.5.exe
>>> But for 2.6, it's:
>>> setuptools-0.6c9-py2.6.egg
>>> For any other egg file, I would use EasyInstall, but I don't think I
>>> can use EasyInstall to install EasyInstall :)
>> No, but you can use ez_setup.
>>
>> Go tohttp://peak.telecommunity.com/dist/ez_setup.pyand save the content
>> of that file as ez_setup.py (cut and paste into your favourite editor may
>> be the simplest way) then run it with your chosen Python. It will find and
>> install the appropriate version of easy install.
>>
>> --
>> Duncan Boothhttp://kupuguy.blogspot.com
> 
> 
> ez_setup worked fine. Thanks for that :)
> 
> According to the web site:
> 
> http://pypi.python.org/pypi/virtualenv
> 
> the next step is to do:
> 
> virtualenv ENV
> 
> If I do that, I get the following message:
> 
> --------------------------------
> 
> C:\Python26\Scripts>virtualenv ENV
> Traceback (most recent call last):
>   File "C:\Python26\Scripts\virtualenv-script.py", line 8, in <module>
>     load_entry_point('virtualenv==1.3.3', 'console_scripts',
> 'virtualenv')()
>   File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
> \virtualenv.py", line 420
>     unzip_setuptools=options.unzip_setuptools)
>   File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
> \virtualenv.py", line 499
>     home_dir, lib_dir, inc_dir, bin_dir = path_locations(home_dir)
>   File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
> \virtualenv.py", line 521
>     import win32api
> ImportError: No module named win32api
> 
> C:\Python26\Scripts>
> 
> --------------------------------
> 
> Any advice?


Install the win32 extensions or install the 2.6 Activestate release.

Emile



From james at agentultra.com  Thu May  7 16:06:43 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 07 May 2009 16:06:43 -0400
Subject: Best practice for operations on streams of text
References: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
Message-ID: <851vr0wucs.fsf@agentultra.com>

James <rent.lupin.road at gmail.com> writes:

> Hello all,
> I'm working on some NLP code - what I'm doing is passing a large
> number of tokens through a number of filtering / processing steps.
>
> The filters take a token as input, and may or may not yield a token as
> a result. For example, I might have filters which lowercases the
> input, filter out boring words and filter out duplicates chained
> together.
>
> I originally had code like this:
> for t0 in token_stream:
>   for t1 in lowercase_token(t0):
>     for t2 in remove_boring(t1):
>       for t3 in remove_dupes(t2):
>         yield t3
>
> Apart from being ugly as sin, I only get one token out as
> StopIteration is raised before the whole token stream is consumed.
>
> Any suggestions on an elegant way to chain together a bunch of
> generators, with processing steps in between?
>
> Thanks,
> James

Co-routines my friends. Google will help you greatly in discovering
this processing wonder.


From tjreedy at udel.edu  Thu May  7 16:10:03 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 16:10:03 -0400
Subject: list comprehension question
In-Reply-To: <8563gcx1p1.fsf@agentultra.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>	<85ocucnbce.fsf@agentultra.com>	<mailman.4923.1241193638.11746.python-list@python.org>	<85ljpb8r1o.fsf@agentultra.com>	<mailman.5109.1241543371.11746.python-list@python.org>	<85d4am8hq4.fsf@agentultra.com>	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
	<8563gcx1p1.fsf@agentultra.com>
Message-ID: <gtvf6r$uf8$1@ger.gmane.org>

J Kenneth King wrote:
>
> Keep in mind that nested comprehensions are still available because
> they do have a use case that justifies their existence.

Nested comprehensions are available because because the syntax makes 
them available by default and making a fiddly exception would be 
contrary to Python's style.  A list comp creates an iterable. A list 
comp requires use of an iterable.  Therefore, a list comp may use a list 
comp.

> However, I
> think the Python documentation warns against their use because people
> might rely on them for problems where they aren't necessary and since
> they are difficult to read... it can lead to difficult to read code.

Whenever the expression that results in the iterable used by a list comp 
is sufficiently complex, readability is improved by pulling it out as a 
separate statement. Nested list comps are often examplex of such 
sufficiently complex expressions, but not the only possible one.

tjr



From OldGrantonian at googlemail.com  Thu May  7 16:15:41 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Thu, 7 May 2009 13:15:41 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com> 
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com> 
	<Xns9C047FE3D4338duncanbooth@127.0.0.1>
	<3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>
	<mailman.5241.1241726706.11746.python-list@python.org>
Message-ID: <2be30c71-4eb3-4ad7-a138-31ee0698a297@e20g2000vbc.googlegroups.com>

On May 7, 9:03?pm, Emile van Sebille <em... at fenx.com> wrote:
> On 5/7/2009 12:53 PM OldGrantonian said...
>
>
>
> > On May 7, 12:34 pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> >> OldGrantonian <OldGranton... at googlemail.com> wrote:
> >>> Thanks to both Steven D'Aprano and Ant :)
> >>>>> ?Sounds like you've downloaded the Python 2.5 version of Easy Install.
> >>> There's no Python 2.6 version of EasyInstall :(
> >> I wonder what I've been running then?
>
> >>> For 2.5, there is:
> >>> setuptools-0.6c9.win32-py2.5.exe
> >>> But for 2.6, it's:
> >>> setuptools-0.6c9-py2.6.egg
> >>> For any other egg file, I would use EasyInstall, but I don't think I
> >>> can use EasyInstall to install EasyInstall :)
> >> No, but you can use ez_setup.
>
> >> Go tohttp://peak.telecommunity.com/dist/ez_setup.pyandsave the content
> >> of that file as ez_setup.py (cut and paste into your favourite editor may
> >> be the simplest way) then run it with your chosen Python. It will find and
> >> install the appropriate version of easy install.
>
> >> --
> >> Duncan Boothhttp://kupuguy.blogspot.com
>
> > ez_setup worked fine. Thanks for that :)
>
> > According to the web site:
>
> >http://pypi.python.org/pypi/virtualenv
>
> > the next step is to do:
>
> > virtualenv ENV
>
> > If I do that, I get the following message:
>
> > --------------------------------
>
> > C:\Python26\Scripts>virtualenv ENV
> > Traceback (most recent call last):
> > ? File "C:\Python26\Scripts\virtualenv-script.py", line 8, in <module>
> > ? ? load_entry_point('virtualenv==1.3.3', 'console_scripts',
> > 'virtualenv')()
> > ? File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
> > \virtualenv.py", line 420
> > ? ? unzip_setuptools=options.unzip_setuptools)
> > ? File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
> > \virtualenv.py", line 499
> > ? ? home_dir, lib_dir, inc_dir, bin_dir = path_locations(home_dir)
> > ? File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
> > \virtualenv.py", line 521
> > ? ? import win32api
> > ImportError: No module named win32api
>
> > C:\Python26\Scripts>
>
> > --------------------------------
>
> > Any advice?
>
> Install the win32 extensions or install the 2.6 Activestate release.
>
> Emile


Thanks for the response :)

Where do I find the win32 extensions?



From tjreedy at udel.edu  Thu May  7 16:21:52 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 16:21:52 -0400
Subject: Python 3.1 beta 1
In-Reply-To: <7c96bd34-b199-4646-a790-4097adcc6999@q14g2000vbn.googlegroups.com>
References: <mailman.5198.1241663377.11746.python-list@python.org>
	<7c96bd34-b199-4646-a790-4097adcc6999@q14g2000vbn.googlegroups.com>
Message-ID: <gtvft0$17j$1@ger.gmane.org>

bearophileHUGS at lycos.com wrote:

> Is the order inside OrderedDict kept with a double linked list of the
> items?

That is one of the things Raymond tried.  Check the code for what he 
settled on for the Python version.  I believe he thinks the best C 
implementation might be different from the best Python version.

>> The OrderedDict constructor and update() method both accept
 >> keyword arguments, but their order is lost because Python's
 >> function call semantics pass-in keyword arguments using a regular
 >> unordered dictionary.
> 
> This is unfortunate :-(
> Well, I'd like function call semantics pass-in keyword arguments to
> use OrderedDicts then... :-)

This possibility has been discussed on pydev.
It would require a sufficiently fast C implementation.

tjr



From gherron at islandtraining.com  Thu May  7 16:23:57 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 07 May 2009 13:23:57 -0700
Subject: Best practice for operations on streams of text
In-Reply-To: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
References: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
Message-ID: <4A03435D.20908@islandtraining.com>

James wrote:
> Hello all,
> I'm working on some NLP code - what I'm doing is passing a large
> number of tokens through a number of filtering / processing steps.
>
> The filters take a token as input, and may or may not yield a token as
> a result. For example, I might have filters which lowercases the
> input, filter out boring words and filter out duplicates chained
> together.
>
> I originally had code like this:
> for t0 in token_stream:
>   for t1 in lowercase_token(t0):
>     for t2 in remove_boring(t1):
>       for t3 in remove_dupes(t2):
>         yield t3
>
> Apart from being ugly as sin, I only get one token out as
> StopIteration is raised before the whole token stream is consumed.
>
> Any suggestions on an elegant way to chain together a bunch of
> generators, with processing steps in between?
>
> Thanks,
> James
> --
> http://mail.python.org/mailman/listinfo/python-list
>   

David Beazly has a very interesting talk on using generators for 
building and linking together individual stream filters.  Its very cool 
and surprisingly eye-opening.

See "Generator Tricks for Systems Programmers" at  
http://www.dabeaz.com/generators/

Gary Herron




From duncan.booth at invalid.invalid  Thu May  7 16:33:12 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 7 May 2009 20:33:12 GMT
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com>
	<Xns9C047FE3D4338duncanbooth@127.0.0.1>
	<3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>
	<mailman.5241.1241726706.11746.python-list@python.org>
	<2be30c71-4eb3-4ad7-a138-31ee0698a297@e20g2000vbc.googlegroups.com>
Message-ID: <Xns9C04DB348C134duncanbooth@127.0.0.1>

OldGrantonian <OldGrantonian at googlemail.com> wrote:

> Where do I find the win32 extensions?

http://www.google.com/search?q=python+win32

Any of the first 4 hits should help.


From Shawn at Milochik.com  Thu May  7 16:36:55 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Thu, 7 May 2009 16:36:55 -0400
Subject: Downloading most recently modified files
In-Reply-To: <23432457.post@talk.nabble.com>
References: <23432457.post@talk.nabble.com>
Message-ID: <2dc0c81b0905071336l365f6b3aq51761873b52e38d0@mail.gmail.com>

On Thu, May 7, 2009 at 2:19 PM, AllenLars <allenreas at gmail.com> wrote:
>
> I am trying to code a script that will allow me to go to ftp site and
> download files based on most recently modified file (date, time). ?I am
> brand new to programming. ?Any and all help is appreciated.
> --<snip>


I've actually written code to do this, and it's fairly easy. Just use
the FTP module to run the "ls" (directory listing) command and parse
the results to get the filenames and timestamps. Then you will be able
to easily do download requests for the file(s) you want.

Perhaps someone else on the list can chime in with a more elegant solution.

Here's enough to get you started:

from ftplib import FTP   #(http://docs.python.org/library/ftplib.html)

ShawnMilo


From pruebauno at latinmail.com  Thu May  7 16:39:25 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Thu, 7 May 2009 13:39:25 -0700 (PDT)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org> 
	<7c96bd34-b199-4646-a790-4097adcc6999@q14g2000vbn.googlegroups.com>
Message-ID: <e0eff93a-3be2-4138-a6e4-95c6f352f79c@n4g2000vba.googlegroups.com>

On May 7, 11:57?am, bearophileH... at lycos.com wrote:
> >Equality tests between OrderedDict objects are order-sensitive and are implemented as list(od1.items())==list(od2.items()). Equality tests between OrderedDict objects and other Mapping objects are order-insensitive<
>
> very nice idea.
>

I don't know if somebody else is interested but I wouldn't mind
support to OrderedDict and namedtuple in the csv module:

Have csv.DictReader return an OrderedDict instead of a regular one
(based on the order of the column names in the header line).

Have csv.DictWriter accept an OrderedDict. That would take care of
this:

"Note that unlike the DictReader class, the fieldnames parameter of
the DictWriter is not optional. Since Python?s dict objects are not
ordered, there is not enough information available to deduce the order
in which the row should be written to the csvfile."
http://docs.python.org/dev/py3k/library/csv.html#csv.DictWriter

Add a new csv.NamedTupleReader and csv.NamedTupleWriter that work
similar to the DictReader and DictWriter then this snippet (in
examples http://docs.python.org/dev/py3k/library/collections.html#collections.namedtuple
):

EmployeeRecord = namedtuple('EmployeeRecord', 'name, age, title,
department, paygrade')
import csv
for emp in map(EmployeeRecord._make, csv.reader(open("employees.csv",
"rb"))):
    print(emp.name, emp.title)

Could be rewritten as:

import csv
for emp in csv.NamedTupleReader("employees.csv"):
    print(emp.name, emp.title)


Also, is there a way to convert a OrderedDict into a namedtuple? It is
possible to go the other direction using namedtuple._asdict, but I
don't see a _fromdict method.

And thanks Steven and Raymond for the Counter class. Several people
had started to see the common pattern and now we have it in the
stdlib.


From piet at cs.uu.nl  Thu May  7 16:43:26 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Thu, 07 May 2009 22:43:26 +0200
Subject: SimpleXMLRPCServer and creating a new object on for each new
	client request.
References: <mailman.5173.1241647285.11746.python-list@python.org>
Message-ID: <m2ws8sk5jl.fsf@cs.uu.nl>

>>>>> Jelle Smet <jelle at smetj.net> (JS) wrote:

>JS> Hi list,
>JS> My goals is to have concurrent and separated client sessions using xmlrpc.
>JS> Initially my though was that SimpleXMLRPCServer was able to create a new
>JS> object instance for each incoming request.

>JS> But this doesn't appear to be the case, unless I'm overlooking something,
>JS> if so please point me out.

You create a single instance of your class and then register that. There
is nothing in your code that makes the server believe it should create a
new instance for each request. 

And then of course this instance always returns the same random number.
It could generate a new random number for each call as follows:
       def show_random(self):
                return random.randrange(0,100000)
but I guess this is not what you want.

Otherwise you would have to register a function that creates a new
instance on every call.
But as Martin P. Hellwig has noted, it wouldn't give you sessions anyway.

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From google at mrabarnett.plus.com  Thu May  7 17:07:42 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 07 May 2009 22:07:42 +0100
Subject: Best practice for operations on streams of text
In-Reply-To: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
References: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
Message-ID: <4A034D9E.7030106@mrabarnett.plus.com>

James wrote:
> Hello all,
> I'm working on some NLP code - what I'm doing is passing a large
> number of tokens through a number of filtering / processing steps.
> 
> The filters take a token as input, and may or may not yield a token as
> a result. For example, I might have filters which lowercases the
> input, filter out boring words and filter out duplicates chained
> together.
> 
> I originally had code like this:
> for t0 in token_stream:
>   for t1 in lowercase_token(t0):
>     for t2 in remove_boring(t1):
>       for t3 in remove_dupes(t2):
>         yield t3
> 
> Apart from being ugly as sin, I only get one token out as
> StopIteration is raised before the whole token stream is consumed.
> 
> Any suggestions on an elegant way to chain together a bunch of
> generators, with processing steps in between?
> 
What you should be doing is letting the filters accept an iterator and
yield values on demand:

def lowercase_token(stream):
     for t in stream:
         yield t.lower()

def remove_boring(stream):
     for t in stream:
         if t not in boring:
             yield t

def remove_dupes(stream):
     seen = set()
     for t in stream:
         if t not in seen:
             yield t
             seen.add(t)

def compound_filter(token_stream):
     stream = lowercase_token(token_stream)
     stream = remove_boring(stream)
     stream = remove_dupes(stream)
     for t in stream(t):
         yield t


From Kevin.Smith at sas.com  Thu May  7 17:23:31 2009
From: Kevin.Smith at sas.com (Kevin D. Smith)
Date: Thu, 7 May 2009 16:23:31 -0500
Subject: heapq.merge with key=
Message-ID: <gtvjgk$tm8$1@foggy.unx.sas.com>

I need the behavior of heapq.merge to merge a bunch of results from a 
database.  I was doing this with sorted(itertools.chain(...), key=...), 
but I would prefer to do this with generators.  My issue is that I need 
the key= argument to sort on the correct field in the database.  
heapq.merge doesn't have this argument and I don't understand the code 
enough to know if it's possible to add it.  Is this enhancement 
possible without drastically changing the current code?

-- 
Kevin D. Smith



From danmcleran at yahoo.com  Thu May  7 17:31:40 2009
From: danmcleran at yahoo.com (danmcleran at yahoo.com)
Date: Thu, 7 May 2009 14:31:40 -0700 (PDT)
Subject: Python 2.4.3 array memory leak
Message-ID: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>

I am using the array module to instantiate many arrays in my
application. It seems like there is a memory leak in there somewhere.
Can anyone confim this and let me know what, if anything, I can do
about it? I am using Fedora Core 5 Linux:

import commands
import array
import itertools
import sys

from itertools import repeat

print '*** before ***'
print commands.getoutput('cat /proc/meminfo').split('\n')[1]
for i in range(100):
    a = array.array('I', repeat(0, int(2E6)))
    del a
print '*** after ***'
print commands.getoutput('cat /proc/meminfo').split('\n')[1]

Output:
*** before ***
MemFree:       1459772 kB
*** after ***
MemFree:       1457688 kB


From bearophileHUGS at lycos.com  Thu May  7 17:33:07 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 7 May 2009 14:33:07 -0700 (PDT)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org> 
	<7c96bd34-b199-4646-a790-4097adcc6999@q14g2000vbn.googlegroups.com> 
	<mailman.5244.1241727728.11746.python-list@python.org>
Message-ID: <854351d6-79ae-47b9-8757-22028443011c@x6g2000vbg.googlegroups.com>

Terry Reedy:
bearophile:
> > Well, I'd like function call semantics pass-in keyword arguments to
> > use OrderedDicts then... :-)

[...]
> It would require a sufficiently fast C implementation.

Right.
Such dict is usually small, so if people want it ordered, it may be
better to just use an array of name-value structs instead of a dict or
ordered dict. Iterating on a 10-pair array is fast on modern CPUs.

Bye,
bearophile


From tjreedy at udel.edu  Thu May  7 17:44:50 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 17:44:50 -0400
Subject: Newcomer to Python tutorial question
In-Reply-To: <lrGMl.6973$hd4.2539@newsfe24.ams2>
References: <hRFMl.50224$tb.4955@newsfe07.ams2><fbGMl.6972$hd4.4032@newsfe24.ams2>	<mailman.5238.1241723354.11746.python-list@python.org>
	<lrGMl.6973$hd4.2539@newsfe24.ams2>
Message-ID: <gtvkoi$ist$1@ger.gmane.org>

Alan Cameron wrote:
>
>>>> why is the printed result of
>>>>
>>>>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>>>>> print(basket)
>>>> {'orange', 'banana', 'pear', 'apple'}
>>>>
>>>> in the sequence given?

> It appears that I used a reserved term when I used 'sequence'.

No and Sort-of.

No: We often use it in the normal English sense of ordered items, as I 
and I think others assume you did.  Your question is quite legitimate, 
and the answer, as indicated, is how an implementation interacts with 
the sequence of additions.

Sort-of: The library manual section of Sequence Types lists the sequence 
operations common to all or most built-in Python sequence classes.  But 
it does not explicitly define sequence.  Ranges, which are iterables 
that directly support only indexing and len(), are called sequences. 
Dicts, which are iterables that support len() but are usually not 
indexed by integers, are not.  So that suggests a minimal definition of 
sequence, but all the other sequence classes support much more that is 
typically assumed.

Keywords are reserved terms in the language such as 'if' and 'None' that 
are specially recognized by the parser and which affect compilation. 
Identifiers of the form '__x...y__' are reserved names.  Non-terminal 
terms in the grammar are reserved terms, in a sense, within the 
reference manual, but 'expression_list', not 'sequence', is used for 
comma-separated sequences of expressions in code.  The comma-separated 
sequence of items in a function call is separately defined as an 
'argument_list' because 'keyword_item's like 'a=b' and '*' and '**' are 
not expressions and because there are some order restrictions on 
argument items.

Terry Jan Reedy



From danmcleran at yahoo.com  Thu May  7 17:47:01 2009
From: danmcleran at yahoo.com (danmcleran at yahoo.com)
Date: Thu, 7 May 2009 14:47:01 -0700 (PDT)
Subject: Python 2.4.3 array memory leak
References: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
Message-ID: <3291c0b8-7e4b-40fe-8984-8562b5c49038@n4g2000vba.googlegroups.com>

On May 7, 3:31 pm, "danmcle... at yahoo.com" <danmcle... at yahoo.com>
wrote:
> I am using the array module to instantiate many arrays in my
> application. It seems like there is a memory leak in there somewhere.
> Can anyone confim this and let me know what, if anything, I can do
> about it? I am using Fedora Core 5 Linux:
>
> import commands
> import array
> import itertools
> import sys
>
> from itertools import repeat
>
> print '*** before ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> for i in range(100):
>     a = array.array('I', repeat(0, int(2E6)))
>     del a
> print '*** after ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> Output:
> *** before ***
> MemFree:       1459772 kB
> *** after ***
> MemFree:       1457688 kB

I hate to reply to my own thread but I wanted to update it. I tried
the same code using ctypes arrays and see no memory leak:

import commands
import array
import itertools
import sys
import ctypes

from itertools import repeat
from ctypes import *

print '*** before ***'
print commands.getoutput('cat /proc/meminfo').split('\n')[1]
for i in range(100):
    a = ARRAY(c_uint, int(2E6))
    del a
print '*** after ***'
print commands.getoutput('cat /proc/meminfo').split('\n')[1]

*** before ***
MemFree:       1416364 kB
*** after ***
MemFree:       1416364 kB


From danmcleran at yahoo.com  Thu May  7 17:58:26 2009
From: danmcleran at yahoo.com (danmcleran at yahoo.com)
Date: Thu, 7 May 2009 14:58:26 -0700 (PDT)
Subject: Python 2.4.3 array memory leak
References: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
	<3291c0b8-7e4b-40fe-8984-8562b5c49038@n4g2000vba.googlegroups.com>
Message-ID: <d72079b9-220c-4d20-83b1-aaf2f8f8f3bd@l28g2000vba.googlegroups.com>

On May 7, 3:47 pm, "danmcle... at yahoo.com" <danmcle... at yahoo.com>
wrote:
> On May 7, 3:31 pm, "danmcle... at yahoo.com" <danmcle... at yahoo.com>
> wrote:
>
>
>
> > I am using the array module to instantiate many arrays in my
> > application. It seems like there is a memory leak in there somewhere.
> > Can anyone confim this and let me know what, if anything, I can do
> > about it? I am using Fedora Core 5 Linux:
>
> > import commands
> > import array
> > import itertools
> > import sys
>
> > from itertools import repeat
>
> > print '*** before ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> > for i in range(100):
> >     a = array.array('I', repeat(0, int(2E6)))
> >     del a
> > print '*** after ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> > Output:
> > *** before ***
> > MemFree:       1459772 kB
> > *** after ***
> > MemFree:       1457688 kB
>
> I hate to reply to my own thread but I wanted to update it. I tried
> the same code using ctypes arrays and see no memory leak:
>
> import commands
> import array
> import itertools
> import sys
> import ctypes
>
> from itertools import repeat
> from ctypes import *
>
> print '*** before ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> for i in range(100):
>     a = ARRAY(c_uint, int(2E6))
>     del a
> print '*** after ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> *** before ***
> MemFree:       1416364 kB
> *** after ***
> MemFree:       1416364 kB


The above code was not correct. I actually do see a memory leak when
using ctypes arrays also. What is going on?


import commands
import array
import itertools
import sys
import ctypes

from itertools import repeat
from ctypes import *

print '*** before ***'
print commands.getoutput('cat /proc/meminfo').split('\n')[1]
for i in range(100):
    a = ARRAY(c_uint, int(2E6))()
    del a
print '*** after ***'
print commands.getoutput('cat /proc/meminfo').split('\n')[1]

Output
*** before ***
MemFree:       1564096 kB
*** after ***
MemFree:       1556884 kB


From norseman at hughes.net  Thu May  7 17:58:29 2009
From: norseman at hughes.net (norseman)
Date: Thu, 07 May 2009 14:58:29 -0700
Subject: subprocess.Popen howto?
In-Reply-To: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>
References: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>
Message-ID: <4A035985.1080806@hughes.net>

?ystein Johansen (OJOHANS) wrote:
> Hi,
>  
> I have problems understanding the subprocess.Popen object. I have a 
> iterative calculation in a process running and I want to pipe the output 
> (stdout) from this calculation to a Python script.
>  
> Let me include a simple code that simulates the calculating process:
> /* This code simulates a big iterative calculation */
> #include <stdio.h>
> #include <math.h>
>  
> int main()
> {
>  float val[2] = { M_PI, M_E };
>  int i;
>  
>  for ( i = 0; i < 2 i++) {
>   sleep( 15 );   /* It's a hard calculation. It take 15 seconds */
>   printf("Value: %5.6f\n", val[i] );
>   fflush( stdout );
>  }
>  return 0;
> }
>  
> let's compile this to mycalc: gcc -o mycalc calc.c ... (untested code)
>  
> In C I have this code which starts the mycalc process and handles the 
> output from it:
>  
> #include <stdio.h>
> #include <assert.h>
> #define BUF_SIZE 256
>  
> int main()
> {
>  FILE *pip;
>  char line[BUF_SIZE];
>  
>  pip = popen("mycalc", "r");
>  assert( pip != NULL );
>  
>  while ( fgets( line, BUF_SIZE, pip )) {
>   printf( "Hello; I got: %s \n", line );
>   fflush( stdout );
>  }
>  pclose( pip );
>  return 0;
> }
> How can I make such while-loop in Python? I assume I should use 
> subprocess.Popen(), but I can't figure out how?
>  
> -?ystein
>  
>  
> 
> -------------------------------------------------------------------
> The information contained in this message may be CONFIDENTIAL and is
> intended for the addressee only. Any unauthorised use, dissemination of the
> information or copying of this message is prohibited. If you are not the
> addressee, please notify the sender immediately by return e-mail and delete
> this message.
> Thank you.
> 
> 
> ------------------------------------------------------------------------
> 
> --
> http://mail.python.org/mailman/listinfo/python-list
================================

If you don't like a lot of typing that obscures the process,
take a look at os.Popen2  Pg.39 or so in Lib.pdf for 2.5.2
In this case - the popen3 is probably your best bet.

I took a test run on "subprocess" a few months ago. My review:
excessive typing to accomplish the simple.  BlackBox stuff is supposed 
to be short and sweet.

BlackBox was the term applied to drivers and couplers back when.
Back when: one started by writing a subroutine that got used.
            next one got to write a program
            next one got to write an application
            then a BlackBox
            from there one could graduate to OS
That was back when!


to repeat from another of my postings:
                         ---
processPython 2.5.2 (r252:60911, Mar  4 2008, 10:40:55)
[GCC 3.3.6] on linux2
Type "help", "copyright", "credits" or "license" for more information.

 >>> import os
 >>> AbWd = os.spawnlp( os.P_WAIT,"abiword","abiword","")

The P_WAIT stops python until the program (abiword in this case) 
completes.  The "" at the end are for tokens to be given to the program 
and yes - contrary to manual, the program MUST be there TWICE (complete 
with any path needed).

for windows this works:
(for cut and paste from cmd.exe, see:
   Re: Copy & Paste in a Dos box  from norseman  05/06/2009 4:28PM
)

Python 2.5.1 ... on win32
 >>> import os
 >>> result = os.spawnl( os.P_WAIT, "d:\\winmcad\\mcad","")

Runs the program mcad. Returns to python when mcad exits.
                         ---


In your case:  substitute ..."your_compiled_c_program", " >yourPy.py")
                 at the obvious places.

In case this isn't clear;
   method 1:  py1.py starts compiled.c which redirects to yourPy.py
   method 2:  py1.py uses os.popen3(compiled.c...) & the two work it out.
In either case the receiver at the end stays open until completion so 
sleep() things are not needed.  (may need to test for EOL and EOT)

HTH

Steve
norseman at hughes.net


From danmcleran at yahoo.com  Thu May  7 18:12:32 2009
From: danmcleran at yahoo.com (danmcleran at yahoo.com)
Date: Thu, 7 May 2009 15:12:32 -0700 (PDT)
Subject: Python 2.4.3 array memory leak
References: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
	<3291c0b8-7e4b-40fe-8984-8562b5c49038@n4g2000vba.googlegroups.com> 
	<d72079b9-220c-4d20-83b1-aaf2f8f8f3bd@l28g2000vba.googlegroups.com>
Message-ID: <404a2491-5f31-4268-9d03-4f59e7eabd51@p4g2000vba.googlegroups.com>

On May 7, 3:58 pm, "danmcle... at yahoo.com" <danmcle... at yahoo.com>
wrote:
> On May 7, 3:47 pm, "danmcle... at yahoo.com" <danmcle... at yahoo.com>
> wrote:
>
>
>
> > On May 7, 3:31 pm, "danmcle... at yahoo.com" <danmcle... at yahoo.com>
> > wrote:
>
> > > I am using the array module to instantiate many arrays in my
> > > application. It seems like there is a memory leak in there somewhere.
> > > Can anyone confim this and let me know what, if anything, I can do
> > > about it? I am using Fedora Core 5 Linux:
>
> > > import commands
> > > import array
> > > import itertools
> > > import sys
>
> > > from itertools import repeat
>
> > > print '*** before ***'
> > > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> > > for i in range(100):
> > >     a = array.array('I', repeat(0, int(2E6)))
> > >     del a
> > > print '*** after ***'
> > > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> > > Output:
> > > *** before ***
> > > MemFree:       1459772 kB
> > > *** after ***
> > > MemFree:       1457688 kB
>
> > I hate to reply to my own thread but I wanted to update it. I tried
> > the same code using ctypes arrays and see no memory leak:
>
> > import commands
> > import array
> > import itertools
> > import sys
> > import ctypes
>
> > from itertools import repeat
> > from ctypes import *
>
> > print '*** before ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> > for i in range(100):
> >     a = ARRAY(c_uint, int(2E6))
> >     del a
> > print '*** after ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> > *** before ***
> > MemFree:       1416364 kB
> > *** after ***
> > MemFree:       1416364 kB
>
> The above code was not correct. I actually do see a memory leak when
> using ctypes arrays also. What is going on?
>
> import commands
> import array
> import itertools
> import sys
> import ctypes
>
> from itertools import repeat
> from ctypes import *
>
> print '*** before ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> for i in range(100):
>     a = ARRAY(c_uint, int(2E6))()
>     del a
> print '*** after ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> Output
> *** before ***
> MemFree:       1564096 kB
> *** after ***
> MemFree:       1556884 kB


Maybe the problem is with the way I was looking at free memory. I
changed my code to look at virtual memory allocated to the process in
question and I do not see any appreciable before/after difference.

import commands
import array
import itertools
import sys
import os

from itertools import repeat

deltas = []
print '*** before ***'
s = commands.getoutput('cat /proc/%d/status' % os.getpid()).split('\n')
[12]
print s
for i in range(100):
    a = array.array('I', repeat(0, int(2E6)))
    del a

print '*** after ***'
s = commands.getoutput('cat /proc/%d/status' % os.getpid()).split('\n')
[12]
print s

Output:

*** before ***
VmSize:	    5952 kB
*** after ***
VmSize:	    5956 kB


From tjreedy at udel.edu  Thu May  7 18:32:25 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 18:32:25 -0400
Subject: Best practice for operations on streams of text
In-Reply-To: <4A034D9E.7030106@mrabarnett.plus.com>
References: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
	<4A034D9E.7030106@mrabarnett.plus.com>
Message-ID: <gtvnho$qvs$1@ger.gmane.org>

MRAB wrote:
> James wrote:
>> Hello all,
>> I'm working on some NLP code - what I'm doing is passing a large
>> number of tokens through a number of filtering / processing steps.
>>
>> The filters take a token as input, and may or may not yield a token as
>> a result. For example, I might have filters which lowercases the
>> input, filter out boring words and filter out duplicates chained
>> together.
>>
>> I originally had code like this:
>> for t0 in token_stream:
>>   for t1 in lowercase_token(t0):
>>     for t2 in remove_boring(t1):
>>       for t3 in remove_dupes(t2):
>>         yield t3

For that to work at all, the three functions would have to turn each 
token into an iterable of 0 or 1 tokens.  Hence the inner 'loops' would 
execute 0 or 1 times.  Better to return a token or None, and replace the 
three inner 'loops' with three conditional statements (ugly too) or less 
efficiently (due to lack of short circuiting),

t = remove_dupes(remove_boring(lowercase_token(t0)))
if t is not None: yield t

>> Apart from being ugly as sin, I only get one token out as
>> StopIteration is raised before the whole token stream is consumed.

That puzzles me.  Your actual code must be slightly different from the 
above and what I imagine the functions to be.  But nevermind, because

>> Any suggestions on an elegant way to chain together a bunch of
>> generators, with processing steps in between?

MRAB's suggestion is the way to go.  Your automatically get 
short-circuiting because each generator only gets what is passed on. 
And resuming a generator is much faster that re-calling a function.

> What you should be doing is letting the filters accept an iterator and
> yield values on demand:
> 
> def lowercase_token(stream):
>     for t in stream:
>         yield t.lower()
> 
> def remove_boring(stream):
>     for t in stream:
>         if t not in boring:
>             yield t
> 
> def remove_dupes(stream):
>     seen = set()
>     for t in stream:
>         if t not in seen:
>             yield t
>             seen.add(t)
> 
> def compound_filter(token_stream):
>     stream = lowercase_token(token_stream)
>     stream = remove_boring(stream)
>     stream = remove_dupes(stream)
>     for t in stream(t):
>         yield t

I also recommend the Beazly reference Herron gave.

tjr



From benjamin at python.org  Thu May  7 18:33:49 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Thu, 7 May 2009 22:33:49 +0000 (UTC)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org>
	<b698a5bf-d43c-412a-a5ee-3753ca31122b@z5g2000vba.googlegroups.com>
Message-ID: <loom.20090507T223236-49@post.gmane.org>

 <pruebauno <at> latinmail.com> writes:
> Congratulations!

Thanks!

> 
> Is it just me or was some nice summary output added to the make
> process? I get a nice list of modules that didn't compile and the ones
> where the library could not be found.

Are you compiling on a different platform? The nice output has been around for a
while, bu only on non-Windows platforms.






From benjamin at python.org  Thu May  7 18:37:46 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Thu, 7 May 2009 22:37:46 +0000 (UTC)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org>
	<7c96bd34-b199-4646-a790-4097adcc6999@q14g2000vbn.googlegroups.com>
Message-ID: <loom.20090507T223606-832@post.gmane.org>

 <bearophileHUGS <at> lycos.com> writes:
> 
> collections.Counter and collections.OrderedDict: very nice and useful.
> Is the order inside OrderedDict kept with a double linked list of the
> items?
 
There's a doubly-linked list containing the values. Another dictionary maps keys
to the list.





From tjreedy at udel.edu  Thu May  7 18:41:10 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 18:41:10 -0400
Subject: Python 2.4.3 array memory leak
In-Reply-To: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
References: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
Message-ID: <gtvo26$s8m$1@ger.gmane.org>

danmcleran at yahoo.com wrote:
> I am using the array module to instantiate many arrays in my
> application. It seems like there is a memory leak in there somewhere.
> Can anyone confim this and let me know what, if anything, I can do
> about it? I am using Fedora Core 5 Linux:
> 
> import commands
> import array
> import itertools
> import sys
> 
> from itertools import repeat
> 
> print '*** before ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> for i in range(100):
>     a = array.array('I', repeat(0, int(2E6)))
>     del a
> print '*** after ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> 
> Output:
> *** before ***
> MemFree:       1459772 kB
> *** after ***
> MemFree:       1457688 kB

What happens if you remove the loop?  I would not be surprised if Python 
grabs the memory once, reuses it, and does not let go.  That is not a 
leak.  What happens if you put the after inside the loop?  Does mem 
usage steadily increase, and continue if you increase range to 1000, 
10000?  That would be a leak.

If there actually is a problem, try a later version of Python.



From danmcleran at yahoo.com  Thu May  7 18:48:51 2009
From: danmcleran at yahoo.com (danmcleran at yahoo.com)
Date: Thu, 7 May 2009 15:48:51 -0700 (PDT)
Subject: Python 2.4.3 array memory leak
References: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
	<mailman.5253.1241736088.11746.python-list@python.org>
Message-ID: <8a515208-f90c-4a1f-a467-0271e623ed77@t11g2000vbc.googlegroups.com>

On May 7, 4:41?pm, Terry Reedy <tjre... at udel.edu> wrote:
> danmcle... at yahoo.com wrote:
> > I am using the array module to instantiate many arrays in my
> > application. It seems like there is a memory leak in there somewhere.
> > Can anyone confim this and let me know what, if anything, I can do
> > about it? I am using Fedora Core 5 Linux:
>
> > import commands
> > import array
> > import itertools
> > import sys
>
> > from itertools import repeat
>
> > print '*** before ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> > for i in range(100):
> > ? ? a = array.array('I', repeat(0, int(2E6)))
> > ? ? del a
> > print '*** after ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> > Output:
> > *** before ***
> > MemFree: ? ? ? 1459772 kB
> > *** after ***
> > MemFree: ? ? ? 1457688 kB
>
> What happens if you remove the loop? ?I would not be surprised if Python
> grabs the memory once, reuses it, and does not let go. ?That is not a
> leak. ?What happens if you put the after inside the loop? ?Does mem
> usage steadily increase, and continue if you increase range to 1000,
> 10000? ?That would be a leak.
>
> If there actually is a problem, try a later version of Python.

I'm not convinced there is a problem anymore. In my latest code, I
record the virtual mem allocated to my specific process and I do not
see it increasing. I would think that if I was leaking memory, I
should see a steady increase in virtual memory consumed by my process,
which I do not.

thanks


From clp2 at rebertia.com  Thu May  7 18:54:39 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 7 May 2009 15:54:39 -0700
Subject: subprocess.Popen howto?
In-Reply-To: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>
References: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>
Message-ID: <50697b2c0905071554pa58d997k405f00662cbb03d1@mail.gmail.com>

2009/5/7 ?ystein Johansen (OJOHANS) <OJOHANS at statoilhydro.com>:
> Hi,
>
> I have problems understanding the subprocess.Popen object. I have a
> iterative calculation in a process running and I want to pipe the output
> (stdout)?from this calculation to a Python script.
>
> Let me include a simple code that simulates the calculating process:
> /* This code simulates a big iterative calculation */
> #include <stdio.h>
> #include <math.h>
>
> int main()
> {
> ?float val[2] = { M_PI, M_E };
> ?int i;
>
> ?for ( i = 0; i < 2 i++) {
> ??sleep( 15 );?? /* It's a hard calculation. It take 15 seconds */
> ??printf("Value: %5.6f\n", val[i] );
> ??fflush( stdout );
> ?}
> ?return 0;
> }
>
> let's compile this to mycalc: gcc -o mycalc calc.c ... (untested code)
>
> In C I have this code?which starts the mycalc process and handles the output
> from it:
>
> #include <stdio.h>
> #include <assert.h>
> #define BUF_SIZE 256
>
> int main()
> {
> ?FILE *pip;
> ?char line[BUF_SIZE];
>
> ?pip = popen("mycalc", "r");
> ?assert( pip != NULL );
>
> ?while ( fgets( line, BUF_SIZE, pip )) {
> ??printf( "Hello; I got: %s \n",?line );
> ??fflush( stdout );
> ?}
> ?pclose( pip );
> ?return 0;
> }
> How can I make such while-loop?in Python? I assume I should use
> subprocess.Popen(), but I can't figure out how?

import subprocess
subprocess.call(["./mycalc"]) # add `bufsize=-1` as argument to have
output be buffered
#process inherits our filehandles and writes directly to them
#.call() only returns once the process has exited

Cheers,
Chris
-- 
http://blog.rebertia.com


From robert.kern at gmail.com  Thu May  7 18:57:04 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 07 May 2009 17:57:04 -0500
Subject: Python 2.4.3 array memory leak
In-Reply-To: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
References: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
Message-ID: <gtvp02$ud9$1@ger.gmane.org>

On 2009-05-07 16:31, danmcleran at yahoo.com wrote:
> I am using the array module to instantiate many arrays in my
> application. It seems like there is a memory leak in there somewhere.
> Can anyone confim this and let me know what, if anything, I can do
> about it? I am using Fedora Core 5 Linux:
>
> import commands
> import array
> import itertools
> import sys
>
> from itertools import repeat
>
> print '*** before ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> for i in range(100):
>      a = array.array('I', repeat(0, int(2E6)))
>      del a
> print '*** after ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> Output:
> *** before ***
> MemFree:       1459772 kB
> *** after ***
> MemFree:       1457688 kB

This is not necessarily indicative of a memory leak, per se. Python sometimes 
does not release memory back to the OS. The memory isn't leaked; it will be 
reused by Python for later allocations. Now, if you saw Python's memory usage 
*grow* with increasing iterations, then that would be evidence of a leak.

Try measuring the "before" memory, then do one iteration, measure the memory 
again (let's call it "intermediate"), then do your loop, and then measure the 
"after" memory. The "intermediate" measurement should be about your "after" 
measurement.

Also, try to measure the process's own memory usage, not the system's free memory.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From piet at cs.uu.nl  Thu May  7 19:17:08 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 08 May 2009 01:17:08 +0200
Subject: SimpleXMLRPCServer and creating a new object on for each new
	client request.
References: <mailman.5173.1241647285.11746.python-list@python.org>
Message-ID: <m2ab5ojyff.fsf@cs.uu.nl>

>>>>> Jelle Smet <jelle at smetj.net> (JS) wrote:

One more thing:

>JS> I start python interactively:
>>>>> import xmlrpclib
>>>>> session1=xmlrpclib.ServerProxy('http://localhost:8000')
>>>>> session2=xmlrpclib.ServerProxy('http://localhost:8000')
>>>>> print session1.show_random()
>JS> 13930
>>>>> print session2.show_random()
>JS> 13930
>>>>> 

I get the impression, also from your use of the variable names
'session1' and 'session2' that xmlrpclib.ServerProxy() gives you some
kind of connection to the XMLRPC server. This is not the case. It gives
just an administration object *in the client* that will communicate with
the server when you call a method on it. The two session's in your code
are therefore functionally equivalent and there is no advantage in
having two of them instead of one. And the name session is misleading.

Please note also that XMLRPC isn't object-oriented. There is just the
server; in the protocol there are no objects other than the server.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From pavlovevidence at gmail.com  Thu May  7 19:35:32 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 7 May 2009 16:35:32 -0700 (PDT)
Subject: subprocess.Popen howto?
References: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net> 
	<mailman.5249.1241733498.11746.python-list@python.org>
Message-ID: <3aaa4e6e-c2c0-43e0-a483-7c79c46137a9@s16g2000vbp.googlegroups.com>

On May 7, 2:58?pm, norseman <norse... at hughes.net> wrote:
> If you don't like a lot of typing that obscures the process,
> take a look at os.Popen2 ?Pg.39 or so in Lib.pdf for 2.5.2
> In this case - the popen3 is probably your best bet.
>
> I took a test run on "subprocess" a few months ago. My review:
> excessive typing to accomplish the simple.


Hmm, I won't argue that it can be excessive typing, but I think its
purpose isn't to accomplish the simple but to hit all the corners of
subprocesses.

What if you want os.system without the shell?  What if you want popen
with the shell?  On Windows what if I want a subprocess without a
console from a Python program in a console.  Stuff like that.

I still use os.system for Q&D stuff, but now use subprocess for
everything else since I prefer thorough to short and sweet.


Carl Banks


From rajanikanth at gmail.com  Thu May  7 19:51:14 2009
From: rajanikanth at gmail.com (Rajanikanth Jammalamadaka)
Date: Thu, 7 May 2009 16:51:14 -0700
Subject: regular expression for getting content between parentheses
Message-ID: <84bdef3c0905071651p60232adagd98aa1138f91d4f9@mail.gmail.com>

Hi

I have a text file as follows:

testName = (
 someParam = value1
 anotherParam = (value2, value3)
)

how do I write a regular expression to get all the contents of the
file which are between the first and last parentheses.

In this case,  I want:

 someParam = value1
 anotherParam = (value2, value3)

Thanks,

Raj


From cripplemeal at gmail.com  Thu May  7 19:52:54 2009
From: cripplemeal at gmail.com (cripplemeal at gmail.com)
Date: Thu, 7 May 2009 16:52:54 -0700 (PDT)
Subject: Pygame
Message-ID: <bdbf3fd4-f524-4da9-ba9e-a8080104aec6@r3g2000vbp.googlegroups.com>

I am following this tutorial on python, and it has instructed me to
download pygame. I am not sure it works with the new version of python
I am using, as the last version it states on the tutorial is 2.6.

It is telling me the module does not exist after I download, and I
even tried placing it in the python folder, but it still came up with
a problem.

Any way to fix it, or do I try something else?


From clp2 at rebertia.com  Thu May  7 20:01:01 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 7 May 2009 17:01:01 -0700
Subject: Pygame
In-Reply-To: <bdbf3fd4-f524-4da9-ba9e-a8080104aec6@r3g2000vbp.googlegroups.com>
References: <bdbf3fd4-f524-4da9-ba9e-a8080104aec6@r3g2000vbp.googlegroups.com>
Message-ID: <50697b2c0905071701k5ad5480u332d5f7e211e71e7@mail.gmail.com>

On Thu, May 7, 2009 at 4:52 PM,  <cripplemeal at gmail.com> wrote:
> I am following this tutorial on python, and it has instructed me to
> download pygame. I am not sure it works with the new version of python
> I am using, as the last version it states on the tutorial is 2.6.
>
> It is telling me the module does not exist after I download, and I
> even tried placing it in the python folder, but it still came up with
> a problem.

Please give the actual full text of the error message (and traceback
if possible).
Please explain precisely which folder you mean by "the python folder".

Cheers,
Chris
-- 
http://blog.rebertia.com


From mensanator at aol.com  Thu May  7 20:04:05 2009
From: mensanator at aol.com (Mensanator)
Date: Thu, 7 May 2009 17:04:05 -0700 (PDT)
Subject: Pygame
References: <bdbf3fd4-f524-4da9-ba9e-a8080104aec6@r3g2000vbp.googlegroups.com>
Message-ID: <f9b26270-3f58-4386-be9e-007f877bbccb@b1g2000vbc.googlegroups.com>

On May 7, 6:52?pm, cripplem... at gmail.com wrote:
> I am following this tutorial on python, and it has instructed me to
> download pygame. I am not sure it works with the new version of python
> I am using, as the last version it states on the tutorial is 2.6.

If the module says 2.6, then that's the version you must use.

There's not much point in using 3.x until the 3rd party modules
catch up. Unless said modules are not important to you.

And even that's no guarantee. The sympy module writers just assumed
their code would work in 2.6 without testing it. Turns out they were
seriously wrong and had to scramble to make a bug fix.

>
> It is telling me the module does not exist after I download, and I
> even tried placing it in the python folder, but it still came up with
> a problem.
>
> Any way to fix it, or do I try something else?



From emile at fenx.com  Thu May  7 20:14:59 2009
From: emile at fenx.com (Emile van Sebille)
Date: Thu, 07 May 2009 17:14:59 -0700
Subject: regular expression for getting content between parentheses
In-Reply-To: <84bdef3c0905071651p60232adagd98aa1138f91d4f9@mail.gmail.com>
References: <84bdef3c0905071651p60232adagd98aa1138f91d4f9@mail.gmail.com>
Message-ID: <gtvteg$8gv$1@ger.gmane.org>

On 5/7/2009 4:51 PM Rajanikanth Jammalamadaka said...
> Hi
> 
> I have a text file as follows:
> 
> testName = (
>  someParam = value1
>  anotherParam = (value2, value3)
> )
> 
> how do I write a regular expression to get all the contents of the
> file which are between the first and last parentheses.
> 
> In this case,  I want:
> 
>  someParam = value1
>  anotherParam = (value2, value3)
> 
> Thanks,

It's not a regex nor probably what you want, but I'd start with...


 >>> filetext = '''testName = (
...  someParam = value1
...  anotherParam = (value2, value3)
... )'''
 >>>
 >>> print filetext.split("(",1)[-1].rsplit(")",1)[0]

  someParam = value1
  anotherParam = (value2, value3)

 >>>

Emile



From rhodri at wildebst.demon.co.uk  Thu May  7 20:19:21 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 08 May 2009 01:19:21 +0100
Subject: regular expression for getting content between parentheses
In-Reply-To: <84bdef3c0905071651p60232adagd98aa1138f91d4f9@mail.gmail.com>
References: <84bdef3c0905071651p60232adagd98aa1138f91d4f9@mail.gmail.com>
Message-ID: <op.utk4ijrda8ncjz@gnudebst>

On Fri, 08 May 2009 00:51:14 +0100, Rajanikanth Jammalamadaka  
<rajanikanth at gmail.com> wrote:

> Hi
>
> I have a text file as follows:
>
> testName = (
>  someParam = value1
>  anotherParam = (value2, value3)
> )
>
> how do I write a regular expression to get all the contents of the
> file which are between the first and last parentheses.

You don't, or at least you don't without some cast-iron guarantees
that your file will look *exactly* like this.  If you can guarantee
that, then this should work:

import re

f = open(filename)
data = f.read()
m = re.match(r"""[^(]*\(     # Find the first open parenthesis
                  (.*)        # Gobble up everything...
                  \)[^)]*$    # ...to the last close paren""",
              data, re.X)
if m:
   print m.group(1)


Notice that this will do *exactly* what you asked; pick up
everything between the first and the last parentheses.  In
particular, if your text looks like this:

testName1 = (
   someParam1 = value1
   anotherParam1 = (value2, value3)
)
testName2 = (
   sameParam2 = value4
)

...then what you'll get out is:

   someParam1 = value1
   anotherParam1 = (value2, value3)
)
testName2 = (
   sameParam2 = value4


You can't get around that with regular expressions, you'll
have to parse your way through the input string counting
open and close parentheses as you go.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From m.irfan.n84 at gmail.com  Thu May  7 20:21:20 2009
From: m.irfan.n84 at gmail.com (Irfan)
Date: Thu, 7 May 2009 17:21:20 -0700 (PDT)
Subject: Computer,Software and Laptops
Message-ID: <f32b1bdc-69c2-489a-acdd-c4499c1c7d8e@h23g2000vbc.googlegroups.com>

Get more information related about computers,laptops and software
visit
(http://in-computersandlaptops.blogspot.com)


From ross.jett at gmail.com  Thu May  7 20:32:22 2009
From: ross.jett at gmail.com (Ross)
Date: Thu, 7 May 2009 17:32:22 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>
	<1d8802ff-8211-467f-95c1-4616e3bd7300@s20g2000vbp.googlegroups.com> 
	<b2cf45ed-d3da-4d93-883c-c8985d40ad55@r34g2000vba.googlegroups.com>
Message-ID: <ced68e15-bcac-4dc0-99a7-c58cbe5adc35@g20g2000vba.googlegroups.com>

On May 7, 1:11?am, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 7, 12:30?am, Ross <ross.j... at gmail.com> wrote:
>
>
>
> > If I were to set up a dictionary that counted players used in the bye
> > list and only allowed players to be added to the bye list if they were
> > within 2 of the least used player, would this be a good approach for
> > managing bye selection or would using a dictionary in this manner be
> > unnecessary/redundant?
>
> I certainly have not proved it, but I think you don't need to resort
> to anything fancy if you are OK with the maximum byes being within two
> of the minimum byes. ?(Maybe this needs to be larger with larger
> numbers of players.) ?Try using your original shuffle but instead of
> selecting matches to "throw away" each week, just use the matches you
> need (to fill up the courts) and pick up where you left off the next
> week. ?For example, with 10 players, each "round" ideally consists of
> five matches. ?If you only have four courts, don't throw away the
> fifth match; save it as the first match next week.
>
> To be honest, I didn't look too carefully at your original shuffle.
> It may be good enough. ?It's a little different than the "standard"
> rotation as presented on Wikipedia:
>
> ?http://en.wikipedia.org/wiki/Round-robin_tournament#Scheduling_algorithm
>
> The one on Wikipedia happened to pass my casual tests with no more
> than a 2-bye difference between the most-played and least-played
> players, and didn't run into the problem of scheduling the same player
> for two matches the same week. ?But I have to stress I only tried a
> few starting values, which all worked; I didn't try to break it, or
> run an extensive battery of tests.
>
> John

John,
   I really appreciate your help with this problem. Thanks to your
suggestions, I've managed to solve the problem. Here's what I did: I
used my original round_robin generator to generate each week. I then
took every week and chained them all together end to end. Then,
depending on how many courts are available, I can select that many
tuples at a time from the list. If you go in order, the discrepancy
between the player with the least amount of byes and the greatest
amount of byes is only 1. If you can make it exactly all the way
through a cycle, there will be no discrepancy. Anyways, I've done all
this by hand and it works so now I'm going to go ahead and code it up.
Again, thanks for your help.

-Ross


From davea at ieee.org  Thu May  7 20:32:48 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 07 May 2009 20:32:48 -0400
Subject: Pygame
In-Reply-To: <bdbf3fd4-f524-4da9-ba9e-a8080104aec6@r3g2000vbp.googlegroups.com>
References: <bdbf3fd4-f524-4da9-ba9e-a8080104aec6@r3g2000vbp.googlegroups.com>
Message-ID: <4A037DB0.9070901@ieee.org>

cripplemeal at gmail.com wrote:
> I am following this tutorial on python, and it has instructed me to
> download pygame. I am not sure it works with the new version of python
> I am using,
and what version would that be?  What release, and what platform?  print 
sys.version and include the output in your next message.
>  as the last version it states on the tutorial is 2.6.
>
> It is telling me the module 

what module?  Copy & paste the error message into your query, and you're 
likely to get useful response.  Also copy & paste the command you're 
issuing to cause this error message.
> does not exist after I download, 

Then your download manager is complaining about a missing module?
> and I
> even tried placing it in the python folder, 
which "python folder".   Be specific.  Do you mean the folder that 
contains Python.exe? And just what are you "placing" there?
> but it still came up with
> a problem.
>   
A new problem?  Be specific.
> Any way to fix it, or do I try something else?
>
>   
Wild guess - maybe it's complaining about a missing SDL module.  PyGame 
is dependent on SDL, as far as I can tell.

Also, see http://www.pygame.org/download.shtml    If you're on Windows, 
PyGame has different versions for different versions of Python.  This 
page recommends Python 2.5.4.  And there isn't a version for Python 3.0



From aahz at pythoncraft.com  Thu May  7 20:55:03 2009
From: aahz at pythoncraft.com (Aahz)
Date: 7 May 2009 17:55:03 -0700
Subject: IIR filter conversion routines for Python?
References: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>
Message-ID: <gtvvt7$ml6$1@panix3.panix.com>

In article <af91e679-e8cf-4db5-9c88-6436e520ce4e at z7g2000vbh.googlegroups.com>,
wzab  <wzab01 at gmail.com> wrote:
>
>I'm looking for procedures converting the IIR filters into cascade and/
>or parallel forms. Something like dir2cas.m or dir2par.m known in the
>Matlab/Octave world.
>Unfortunately SciPy does not contain such functions.
>If they are not available, I would be grateful for any hints helping
>me to implement them myself.

Even though they're not in SciPy, the mailing lists for NumPy/SciPY are
probably good places to get advice.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From gnewsg at gmail.com  Thu May  7 21:12:44 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Thu, 7 May 2009 18:12:44 -0700 (PDT)
Subject: Call a function when a thread exits
Message-ID: <5664df89-2966-45e4-a959-f4fc85c2e50f@g20g2000vba.googlegroups.com>

Hi,
I'm searching for a smooth way to call a certain function when a
thread has finished its job.
I guess I can keep calling isAlive() in a loop and call my function
when it returns False but it's not very elegant.
Actually I'm a bit surprised it doesn't exists an "atexit" function.
Something like:

import threading, time

def myfun():
    time.sleep(1)
    print "hello"

def cleanup():
    print "thread finished, starting cleanup operations..."

t = threading.Thread(target=myfun)
t.atexit(target=cleanup)
t.start()


Is there a reason why there's no such thing in the threading module?


--- Giampaolo
http://code.google.com/p/pyftpdlib/


From rajanikanth at gmail.com  Thu May  7 21:25:39 2009
From: rajanikanth at gmail.com (Rajanikanth Jammalamadaka)
Date: Thu, 7 May 2009 18:25:39 -0700
Subject: regular expression for getting content between parentheses
In-Reply-To: <op.utk4ijrda8ncjz@gnudebst>
References: <84bdef3c0905071651p60232adagd98aa1138f91d4f9@mail.gmail.com>
	<op.utk4ijrda8ncjz@gnudebst>
Message-ID: <84bdef3c0905071825r523ed786g4a5d03e893cc924a@mail.gmail.com>

Thanks for your replies.

I changed the file to look like this:


{ testName : {"someParam": "value1", "anotherParam": (value2, value3)},
}

to make it look like a hash to Python.

Thanks,

Raj

On Thu, May 7, 2009 at 5:19 PM, Rhodri James
<rhodri at wildebst.demon.co.uk> wrote:
> On Fri, 08 May 2009 00:51:14 +0100, Rajanikanth Jammalamadaka
> <rajanikanth at gmail.com> wrote:
>
>> Hi
>>
>> I have a text file as follows:
>>
>> testName = (
>> ?someParam = value1
>> ?anotherParam = (value2, value3)
>> )
>>
>> how do I write a regular expression to get all the contents of the
>> file which are between the first and last parentheses.
>
> You don't, or at least you don't without some cast-iron guarantees
> that your file will look *exactly* like this. ?If you can guarantee
> that, then this should work:
>
> import re
>
> f = open(filename)
> data = f.read()
> m = re.match(r"""[^(]*\( ? ? # Find the first open parenthesis
> ? ? ? ? ? ? ? ? (.*) ? ? ? ?# Gobble up everything...
> ? ? ? ? ? ? ? ? \)[^)]*$ ? ?# ...to the last close paren""",
> ? ? ? ? ? ? data, re.X)
> if m:
> ?print m.group(1)
>
>
> Notice that this will do *exactly* what you asked; pick up
> everything between the first and the last parentheses. ?In
> particular, if your text looks like this:
>
> testName1 = (
> ?someParam1 = value1
> ?anotherParam1 = (value2, value3)
> )
> testName2 = (
> ?sameParam2 = value4
> )
>
> ...then what you'll get out is:
>
> ?someParam1 = value1
> ?anotherParam1 = (value2, value3)
> )
> testName2 = (
> ?sameParam2 = value4
>
>
> You can't get around that with regular expressions, you'll
> have to parse your way through the input string counting
> open and close parentheses as you go.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Rajanikanth


From pavlovevidence at gmail.com  Thu May  7 21:33:38 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 7 May 2009 18:33:38 -0700 (PDT)
Subject: Call a function when a thread exits
References: <5664df89-2966-45e4-a959-f4fc85c2e50f@g20g2000vba.googlegroups.com>
Message-ID: <eb595814-19c9-44f1-a1de-9c313b0adc18@s31g2000vbp.googlegroups.com>

On May 7, 6:12?pm, "Giampaolo Rodola'" <gne... at gmail.com> wrote:
> Hi,
> I'm searching for a smooth way to call a certain function when a
> thread has finished its job.
> I guess I can keep calling isAlive() in a loop and call my function
> when it returns False but it's not very elegant.
> Actually I'm a bit surprised it doesn't exists an "atexit" function.
> Something like:
>
> import threading, time
>
> def myfun():
> ? ? time.sleep(1)
> ? ? print "hello"
>
> def cleanup():
> ? ? print "thread finished, starting cleanup operations..."
>
> t = threading.Thread(target=myfun)
> t.atexit(target=cleanup)
> t.start()
>
> Is there a reason why there's no such thing in the threading module?

You can define your target function to clean up on exit.  Using your
definitions of myfun and cleanup,

def mycleanfun():
    try:
        myfun()
    finally:
        cleanup()

t = threading.Thread(target=mycleanfun)
t.start()


Carl Banks


From baseelinger at yahoo.com  Thu May  7 21:52:01 2009
From: baseelinger at yahoo.com (baseelinger at yahoo.com)
Date: Thu, 7 May 2009 18:52:01 -0700 (PDT)
Subject: Web Based Front End?
Message-ID: <18804639-32ae-4bdf-9ecc-4c8b21f8a43f@g19g2000vbi.googlegroups.com>

I have been using Python for several years now and although my main
occupation is not directly related to writing code I have been able to
use Python to accomplish writing complex configuration files and
analyzing data against standards, etc.  I now have a requirement to
provide a web based interface rather than say using the IDLE GUI for
several reasons, (allowing others to use a server based Python script
and to provide a slicker user interface via the users web browser).

As I wade into very new territory I see articles on PHP, mod_python,
Python Server Pages, CGI, Zope, Python in PHP, CherryPy, Pylons, etc.,
etc.  It's all pretty confusing and while one method may work to
accomplish the task at hand someone with far greater experience may
look at the situation and say, "um, yeah, it will work that way but it
would have been a whole lot easier if you had done it this way...".

So, my question is what is the best method to be able to have a user
enter specific data on a web page, have that data be passed to the
Python script and then have the output returned to the web page?
Essentially, I want to use a web based front end to accomplish the
same thing that the IDLE GUI does, (asks me a few questions, I answer
them, it builds a configuration file and prints it to the screen).

A basic example can be found at http://webpython.codepoint.net/wsgi_request_parsing_post
using httpd in Python but its seems very basic.

Can anyone point me in the right direction?  Thanks in advance for any
assistance you may be able to provide.


From gallium.arsenide at gmail.com  Thu May  7 22:00:20 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Thu, 7 May 2009 19:00:20 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>
	<1d8802ff-8211-467f-95c1-4616e3bd7300@s20g2000vbp.googlegroups.com> 
	<b2cf45ed-d3da-4d93-883c-c8985d40ad55@r34g2000vba.googlegroups.com> 
	<ced68e15-bcac-4dc0-99a7-c58cbe5adc35@g20g2000vba.googlegroups.com>
Message-ID: <0226fb35-a21e-4ba8-bafd-71af8abbd459@p4g2000vba.googlegroups.com>

On May 7, 8:32?pm, Ross <ross.j... at gmail.com> wrote:
> I've managed to solve the problem. If you go in
> order, the discrepancy between the player with the
> least amount of byes and the greatest amount of byes
> is only 1.

I don't mean to rain on your parade, but that's not the case for all
values.  For example, with 7 players and only 1 or 2 courts, there
will be weeks in the middle where the bye-difference is 2.

This behavior is present in both your shuffle and the standard one in
Wikipedia.

Ultimately, as it pertains to your physical tennis scheduling with
actual courts and actual players, you may never encounter the
imbalance.  But as a math problem, it's still not solved.  (Someone
may have solved it or proved it insoluble, but obviously I am not
aware of such a proof, because otherwise I would have presented it
already.)

John


From lepto.python at gmail.com  Thu May  7 22:27:08 2009
From: lepto.python at gmail.com (oyster)
Date: Fri, 8 May 2009 10:27:08 +0800
Subject: free chart lib for Python?
Message-ID: <6a4f17690905071927u56bc48b9k51cb55af693b685f@mail.gmail.com>

I mean chart, not plot. If you don't know the difference, you can
check www.advsofteng.com, which is a commercial program

is there such a thing with many kinds of chart, i.e. pie-chart,
line-chart, ......?

A long time ago, I programmed a rmchart interface, however rmchart is
windows only, and www.rmchart.com disappeared now

See you


From srikrishnamohan at gmail.com  Thu May  7 22:32:37 2009
From: srikrishnamohan at gmail.com (km)
Date: Fri, 8 May 2009 11:32:37 +0900
Subject: update python version
Message-ID: <f4cc03640905071932n55999edeyf5546f35b0e45595@mail.gmail.com>

Hi all,

Is there a way to update python 2.6.1 to 2.6.2  using easy_install ?

thanks,
regards,
KM
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From sjmachin at lexicon.net  Thu May  7 22:42:04 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 7 May 2009 19:42:04 -0700 (PDT)
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
Message-ID: <b18d492d-7fd5-4ce9-ba4d-c39cf598afd6@u39g2000pru.googlegroups.com>

On May 8, 1:45?am, Nick <nic... at gmail.com> wrote:
> On May 5, 8:27?pm, Tim Golden <m... at timgolden.me.uk> wrote:
>
>
>
> > Nick wrote:
> > > Part of the problem is that the 'selection' needs to be in a config
> > > file. I can put the if row['status'] != 'Cancelled': return True into
> > > a config, read it and eval it, but its not quite as clean as ansql
> > > route.
>
> > Still not clear what the restriction is. If you were writingSQLyou'd have to read *something* from your config file,
> > unless you're suggesting that the "config file" is in fact
> > aSQLfile. Which is one way of doing it, but then you might
> > just as well have your config file as a Python file and
> > import it.
>
> > Have I missed the point somewhere here? Can you give an
> > example -- even a fictional one -- of what you couldn't
> > do using, say, the example I gave earlier?
>
> > TJG
>
> Solution found. In the end I used SQLite to read from a csv file, and
> now I can query the CSV file. The file is read using the csv module
>
> First create a function
>
> def fraction(p, denom):
> ? ? num, frac = p.split ('-')
> ? ? return float (num) + float (frac) / denom
>
> for use within queries.
>
> Now build the class.
>
> ? ? ? ? self.filename ?= filename
> ? ? ? ? self.dialect ? = dialect
> ? ? ? ? self.query ? ? = query
> ? ? ? ? reader = csv.reader (open (filename, 'r'))
> ? ? ? ? self.connection = sqlite.connect(":memory:")
> ? ? ? ? self.connection.create_function("fraction", 2, fraction) #
> Adds in function
> ? ? ? ? self.cursor = self.connection.cursor()
> ? ? ? ? first = True
> ? ? ? ? for row in reader:
> ? ? ? ? ? ? if first:
> ? ? ? ? ? ? ? ? headers = []
> ? ? ? ? ? ? ? ? for r in row:
> ? ? ? ? ? ? ? ? ? ? n = r.strip().replace (' ', '_').replace ('-','_')
> ? ? ? ? ? ? ? ? ? ? headers.append (n)
> ? ? ? ? ? ? ? ? command = 'create table csv (%s)' % ','.join (headers)
> ? ? ? ? ? ? ? ? self.cursor.execute (command)
> ? ? ? ? ? ? ? ? first = False
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? command = 'insert into csv values ("%s")' % '","'.join
> (row)
> ? ? ? ? ? ? ? ? self.cursor.execute (command)
>
> and then I can use this
>
> ? ? ? ? self.cursor.execute (self.query)
> ? ? ? ? rows = self.cursor.fetchall()
> ? ? ? ? headers = []
> ? ? ? ? for r in self.cursor.description:
> ? ? ? ? ? ? headers.append (r[0])
> ? ? ? ? results = Results.Results (headers, self.name, {})
> ? ? ? ? i = 0
> ? ? ? ? for row in rows:
> ? ? ? ? ? ? results.add (row, i)
> ? ? ? ? ? ? i = i + 1
> ? ? ? ? return results
>
> to query the results.
>
> Results.Results is one of my classes that's reused in lots of places.
>
> The query then looks somethign like this
>
> ? ? ? ? ? ? ? ? select
> ? ? ? ? ? ? ? ? ? ? Client_Reference_Number as TrdNbr,
> ? ? ? ? ? ? ? ? ? ? Asset_Number as ISIN,
> ? ? ? ? ? ? ? ? ? ? Quantity as Qty,
> ? ? ? ? ? ? ? ? ? ? status
> ? ? ? ? ? ? ? ? from
> ? ? ? ? ? ? ? ? ? ? csv

The remaining lines of your SELECT statement are incredibly redundant
AFAICT. It seems you have pushed the contents of your csv file into a
data base and pulled them ALL out again ... not what I'd call a
"query". What's the point?


> ? ? ? ? ? ? ? ? where status in ("CANCELLED")
>
> ? ? ? ? ? ? ? ? union
>
> ? ? ? ? ? ? ? ? select
> ? ? ? ? ? ? ? ? ? ? Client_Reference_Number as TrdNbr,
> ? ? ? ? ? ? ? ? ? ? Asset_Number as ISIN,
> ? ? ? ? ? ? ? ? ? ? Quantity as Qty,
> ? ? ? ? ? ? ? ? ? ? status
> ? ? ? ? ? ? ? ? from
> ? ? ? ? ? ? ? ? ? ? csv
> ? ? ? ? ? ? ? ? where status not in ("CANCELLED")
>
> All incredibly neat and the first time I've used SQLite.
>
> nick



From davecook at nowhere.net  Thu May  7 22:45:12 2009
From: davecook at nowhere.net (David Cook)
Date: 08 May 2009 02:45:12 GMT
Subject: Which one is best Python or Java for developing GUI applications?
References: <mailman.5092.1241505670.11746.python-list@python.org>
Message-ID: <4a039cb8$0$32213$c3e8da3@news.astraweb.com>

On 2009-05-05, srinivasan srinivas <sri_annauni at yahoo.co.in> wrote:
 
> Could you tell me does Python have any advantages over Java for the
> development of GUI applications?

You don't have to choose between them.  You can program Swing applications
in Jython.  And Jython is just a jar that you can bundle in another jar for
distribution just like any other Java jar.  You will have to understand Java
code to learn Swing, though.  I suggest also looking into the
Swing Application Framework and Netbeans.

However, I would look at PyQt first (if the license requirements are OK).
PyQT is well thought out, consistent, and featureful.  And then maybe try
wxPython if you need a more liberal license.  wxPython is clunky and
inconsistent, but gets the job done.

Dave Cook


From wuwei23 at gmail.com  Thu May  7 23:32:18 2009
From: wuwei23 at gmail.com (alex23)
Date: Thu, 7 May 2009 20:32:18 -0700 (PDT)
Subject: free chart lib for Python?
References: <mailman.5263.1241750053.11746.python-list@python.org>
Message-ID: <6d770dc1-6efa-4535-a16d-55667591c328@j18g2000prm.googlegroups.com>

On May 8, 12:27?pm, oyster <lepto.pyt... at gmail.com> wrote:
> is there such a thing with many kinds of chart, i.e. pie-chart,
> line-chart, ......?

The best place to look is PyPI, there are several possible candidates
there:
http://pypi.python.org/pypi?%3Aaction=search&term=charts&submit=search

I've had a lot of success with the Python Google Chart module:
http://pygooglechart.slowchop.com/


From jjposner at snet.net  Thu May  7 23:56:48 2009
From: jjposner at snet.net (John Posner)
Date: Thu, 07 May 2009 23:56:48 -0400
Subject: tkinter and widget placement after resizing
In-Reply-To: <bfc1d96a-3ea3-4bd8-a06a-afb352e608c8@l5g2000vbc.googlegroups.com>
References: <bfc1d96a-3ea3-4bd8-a06a-afb352e608c8@l5g2000vbc.googlegroups.com>
Message-ID: <4A03AD80.7050905@snet.net>

jamieson wrote:
> i.e. start out with a window like this:
>
> [1][4][7]
> [2][5][8]
> [3][6][9]
>
>
> make the main window larger and end up with this:
>
> [1][6]
> [2][7]
> [3][8]
> [4][9]
> [5

Here's a solution, using Label widgets for clarity. The keys are:

* start numbering from zero, not one
* use divmod() on an item's index within the list to determine the 
item's column/row position
* bind the <Configure> event for window resizing

# redo_layout.py

import sys
from Tkinter import *

CHAR_WIDTH = 10
PAD = 3
INIT_COL_COUNT = 3

def grid_positions(count, numcols):
    """
    return a generator for (colnum, rownum) position tuples,
    given the total number of items and the number of columns

    the first column is filled with items, then the second, etc.
    """
    numrows, rem = divmod(count, numcols)
    # need an extra row if there was a remainder
    if rem:
        numrows += 1

    # return value is a generator
    return ( divmod(i, numrows) for i in range(count) )

def place_labels(event):
    """
    reposition all the items in the sequence "label_list"
    """
    # assumption: all labels have same width
    label_width = label_list[0].winfo_width()
    window_width = frm.winfo_width()

    # calculate new column count
    new_col_count = window_width // (label_width+PAD)

    # get new position iterator
    pos_iter = grid_positions(LABEL_COUNT, new_col_count)

    # redo layout
    for lab in label_list:
        lab.grid_forget()
        colnum, rownum = pos_iter.next()
        lab.grid(column=colnum, row=rownum, padx=PAD, pady=PAD)

def create_labels(count):
    """
    create a list of Label items,
    with text "1", "2", etc.
    """
    return [ Label(frm, bg='cyan', width=CHAR_WIDTH, text="%d" % i)
             for i in range(count) ]

if __name__ == "__main__":
    try:
        LABEL_COUNT = int(sys.argv[1])
    except (ValueError, IndexError):
        print "ERROR: Must specify number of labels"
        sys.exit(1)

    # Tkinter window and whole-window Frame
    root = Tk()
    frm = Frame(root)
    frm.pack(expand=True, fill=BOTH)

    # create some labels
    label_list = create_labels(LABEL_COUNT)

    # perform initial layout
    pos_iter = grid_positions(LABEL_COUNT, INIT_COL_COUNT)
    for lab in label_list:
        coloff, rowoff = pos_iter.next()
        lab.grid(column=coloff, row=rowoff, padx=PAD, pady=PAD)
    del pos_iter

    # event configuration: redo the layout when the window size changes
    frm.bind('<Configure>', place_labels)

    # go
    root.mainloop()



From clp2 at rebertia.com  Fri May  8 00:48:43 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 7 May 2009 21:48:43 -0700
Subject: heapq.merge with key=
In-Reply-To: <gtvjgk$tm8$1@foggy.unx.sas.com>
References: <gtvjgk$tm8$1@foggy.unx.sas.com>
Message-ID: <50697b2c0905072148n6e126fb8l91bf049cdbe451ec@mail.gmail.com>

On Thu, May 7, 2009 at 2:23 PM, Kevin D. Smith <Kevin.Smith at sas.com> wrote:
> I need the behavior of heapq.merge to merge a bunch of results from a
> database. ?I was doing this with sorted(itertools.chain(...), key=...), but
> I would prefer to do this with generators. ?My issue is that I need the key=
> argument to sort on the correct field in the database. ?heapq.merge doesn't
> have this argument and I don't understand the code enough to know if it's
> possible to add it. ?Is this enhancement possible without drastically
> changing the current code?

I think so. Completely untested code:

def key(ob):
    #code here

class Keyed(object):
    def __init__(self, obj):
        self.obj = obj
    def __cmp__(self, other):
        return cmp(key(self.obj), key(other.obj))

def keyify(gen):
    for item in gen:
        yield Keyed(item)

def stripify(gen):
    for keyed in gen:
        yield keyed.obj

merged = stripify(merge(keyify(A), keyify(B), keyify(C))) #A,B,C being
the iterables


Cheers,
Chris
-- 
http://blog.rebertia.com


From ganesh.gbg at gmail.com  Fri May  8 00:51:36 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Thu, 7 May 2009 21:51:36 -0700 (PDT)
Subject: About twisted.mail.smtp.SMTPDeliveryError
Message-ID: <8bb91b91-c00d-48d1-8b64-6f4765754e1c@d19g2000prh.googlegroups.com>

hi group,
I wrote a code as below


from twisted.mail.smtp import sendmail
from twisted.internet import reactor
from twisted.python.log import err
import time

MAILSERVER = 'mail.xxx.com'
listTo = ['gxxxxxx at gmail.com', 'gjangoxxxxx.py at gmail.com',
'lxxxxt at yahoo.co.in', 'gk1xx at gmail.com']
FROM = 'ganeshxx at .....com'
MSGBODY = "hi this final test"
a= time.time()
done = sendmail(MAILSERVER, FROM, listTo,
MSGBODY ,senderDomainName=None, port=25)
done.addErrback(err)
done.addCallback(lambda ignored: reactor.stop())
reactor.run()
print "Took %s seconds" %str(time.time()-a)



it showed me a error
like

"Failure: twisted.mail.smtp.SMTPDeliveryError: 554 No recipients
accepted"
and
"Relay access denied" errors

Is this error is because, i haven't
authenticated my email account to send mail.
Is so , having  username and password of smpt server ,how to
authenticate in
Twisted Framework

Thanks


From li.wang.d at gmail.com  Fri May  8 01:04:34 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 8 May 2009 15:04:34 +1000
Subject: Python 2.6, File read() problems in Windows Xp
Message-ID: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>

Hi all:

I am trying to read a non-text file as a string by using Python
read(), however, it seems there is some thing wrong with it. I can use
read() on text file correctly, but unable to read .xls file correctly.
(The program can read any file correctly in Fedora 10)

Any idea how to solve this problem?

Thank you very much!

-- 
Li
------
Time is all we have
and you may find one day
you have less than you think


From clp2 at rebertia.com  Fri May  8 01:38:10 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 7 May 2009 22:38:10 -0700
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
Message-ID: <50697b2c0905072238o6a00fc07ibc92423926313131@mail.gmail.com>

On Thu, May 7, 2009 at 10:04 PM, Li Wang <li.wang.d at gmail.com> wrote:
> Hi all:
>
> I am trying to read a non-text file as a string by using Python
> read(), however, it seems there is some thing wrong with it. I can use
> read() on text file correctly, but unable to read .xls file correctly.
> (The program can read any file correctly in Fedora 10)
>
> Any idea how to solve this problem?

You need to add a "b" to the `flags` argument to open() when you open
the file, e.g. open("the_file.xls", "rb")
Unlike *nix, Windows differentiates between binary and text files,
hence the need for the "b" flag to specify which you're dealing with.

Further info: http://docs.python.org/library/functions.html#open

Cheers,
Chris
-- 
http://blog.rebertia.com


From dchandran1 at yahoo.com  Fri May  8 02:05:36 2009
From: dchandran1 at yahoo.com (Deepak Chandran)
Date: Thu, 7 May 2009 23:05:36 -0700 (PDT)
Subject: configuring python with disable-thread in Ubuntu
Message-ID: <968094.67933.qm@web110411.mail.gq1.yahoo.com>

Hello, 

I am embedding python inside a C++ program. For some reason (I think libxml2), I am getting Segmentation fault at PyThread_release_lock. 

The solution I found online was to configure python with --disable-thread.

I used "apt-get install python-dev" to install python. 
How do I re-configure it using the --disable-thread option?

Thanks.


      
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From list at qtrac.plus.com  Fri May  8 02:37:03 2009
From: list at qtrac.plus.com (Mark Summerfield)
Date: Thu, 7 May 2009 23:37:03 -0700 (PDT)
Subject: Public attributes with really private data
Message-ID: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>

Hi,

I had a quick search & didn't find anything _nice_ that produced
attributes with really private data, so I came up with a possible
solution---for Python 3.
(For Python 2 there does seem to be an approach although I'm not
keen on it:
http://www.builderau.com.au/blogs/byteclub/viewblogpost.htm?p=339270875
)

Here's a standard class with one read-only and one writable
property that has a tiny bit of validation.

class P:
    def __init__(self, w):
        self.w = w
    @property
    def r(self): return 5
    @property
    def w(self): return self.__w
    @w.setter
    def w(self, value):
        if value > 0: # Only +ve values allowed
            self.__w = value
        else:
            raise ValueError("'{0}' is not valid for w".format(value))

The read-only property is completely private because it isn't
actually stored as such.

But if we do dir() on an instance, in addition to 'r' and 'w', we
also have '_P__w'. So the writable property's data is easily
accessible, and the validation can be got around:

>>> p = P(9)
>>> p.r, p.w
(5, 9)
>>> p.w = 43
>>> p.r, p.w
(5, 43)
>>> p.w = -7
Traceback (most recent call last):
...
ValueError: '-7' is not valid for w
>>> p._P__w = -7
>>> p.r, p.w
(5, -7)

Here's a class where I can't think of a way to access the private
data and set invalid values.

class A:
    r = Attribute("r", 5)
    w = Attribute("w", None, lambda self, value: value > 0)
    def __init__(self, w):
        self.w = w

The Attribute class is a descriptor that takes three arguments:
name of attribute, initial value (essential for read-only
attributes!), and a validator function (which could be "lambda
*a: True" if any value is accepatble).

>>> a = A(9)
>>> a.r, a.w
(5, 9)
>>> a.w = 43
>>> a.r, a.w
(5, 43)
>>> a.w = -7
Traceback (most recent call last):
...
ValueError: '-7' is not valid for w

If we do a dir(a) the only attributes we get (beyond those from
object) are 'r' and 'w', so it shouldn't be possible to get
around the validation---at least not easily.

Here's a rough & ready implementation of the Attribute class:

class Attribute:
    def __init__(self, name, first_value=None, validator=None):
        self.__name__ = name
        hidden_value = first_value
        self.__getter = lambda self: hidden_value
        if validator is not None:
            def set(self, value):
                if validator(self, value):
                    nonlocal hidden_value
                    hidden_value = value
                else:
                    raise ValueError("'{0}' is not valid for
{1}".format(value, name))
            self.__setter = set
        else:
            self.__setter = None
    def __get__(self, instance, owner=None):
        if instance is None:
            return self
        return self.__getter(instance)
    def __set__(self, instance, value):
        if self.__setter is None:
            raise AttributeError("'{0}' is read-only".format(
                                 self.__name__))
        return self.__setter(instance, value)

The key to making the attribute data private is that it is held
as part of a closure's state. Notice that nonlocal is needed,
so you need Python 3.

--
Mark Summerfield, Qtrac Ltd, www.qtrac.eu
    C++, Python, Qt, PyQt - training and consultancy
	"Programming in Python 3" - ISBN 0137129297


From gjango.py at gmail.com  Fri May  8 02:37:27 2009
From: gjango.py at gmail.com (guptha)
Date: Thu, 7 May 2009 23:37:27 -0700 (PDT)
Subject: Simple programme - Just want to know whether this is correct way of 
	coding
Message-ID: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>

Hi group,
This is my first programme in python ,I need to know whether my code
is in the right path of performance

I wrote a code using multithreading to send mails

FROM = '....com'

SUBJECT = 'This is the subject'
MSGBODY = 'This the body of the message '
MAILSERVER = 'mail....com'
port = 25
username = 'username'
password = 'pass'

# trim the strings of any leading or trailing spaces
FROM = FROM.strip()
SUBJECT = SUBJECT.strip()
MSGBODY = MSGBODY.strip()
MAILSERVER = MAILSERVER.strip()
username = username.strip()
password = password.strip()


# set up email parameters
msg = MIMEMultipart()
msg['From'] = FROM
msg['Subject'] = SUBJECT

#--------------------------------------------------
print "Starting Multi Thread Method"

class MyThread(Thread):

    def __init__(self, site,  FROM, MSGBODY):
        Thread.__init__(self)
        self.site = site
	self.FROM=FROM
	self.MSGBODY=MSGBODY

    def run(self):
	#Connect to server
	print 'Connecting to mail server ', MAILSERVER
	try:
		s = smtplib.SMTP(MAILSERVER,port)
		print 'connected'
	#s.set_debuglevel(1)
	except:
		print 'ERROR: Unable to connect to mail server', sys.exc_info	()[0]
	 	sys.exit(1)

	#login to server
	if password <> '':
		print 'Logging into mail server'
		try:
			s.login(username,password)
		except:
			print 'ERROR: Unable to login to mail server', MAILSERVER
			print 'Please recheck your password'
			sys.exit(1)
	print "running for %s " %self.site
	print s
	s.sendmail(self.FROM, self.site, self.MSGBODY)
	print "from %s" %self.FROM
	print "msg %s" %self.MSGBODY
 	print "Emailed for  site %s" %self.site
	s.quit()
	s.close()


a= time.time()
threads = []

for site in listTo:
    T = MyThread(site,FROM,MSGBODY)
    threads.append(T)
    T.start()


for i in threads:
    i.join()

print "Took %s seconds" %str(time.time()-a)

#-----------------------------------------------------

The code Works fine ,but I doubt about the performance issue ,My
intention is to send mails concurrently to large number of mail.
1.For every mail id i send It creates a new SMTP object,in case, if i
send to 1000 or more ids
      a) It obliviously creates that much SMPT connections ,is this a
right approach .
Thanks in Advance


From gh at ghaering.de  Fri May  8 02:40:40 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Fri, 08 May 2009 08:40:40 +0200
Subject: configuring python with disable-thread in Ubuntu
In-Reply-To: <968094.67933.qm@web110411.mail.gq1.yahoo.com>
References: <968094.67933.qm@web110411.mail.gq1.yahoo.com>
Message-ID: <gu0k58$is9$1@ger.gmane.org>

Deepak Chandran wrote:
> Hello, 
> 
> I am embedding python inside a C++ program. For some reason (I think
> libxml2), I am getting Segmentation fault at PyThread_release_lock. 
> 
> The solution I found online was to configure python with --disable-thread.

That doesn't sound like a solution, but like a kludge.

> I used "apt-get install python-dev" to install python. 
> How do I re-configure it using the --disable-thread option?

You don't want your system Python to be built with "--disable-thread".
Other utilities might depend on threads being available in Python.

If you really want to go this route, download Python from python.org and
build it from source with the required options to "./configure".

-- Gerhard



From shstein2002 at yahoo.com  Fri May  8 02:42:35 2009
From: shstein2002 at yahoo.com (shstein2002 at yahoo.com)
Date: Thu, 7 May 2009 23:42:35 -0700 (PDT)
Subject: scrolledtext widget error?
Message-ID: <02b12656-f849-4856-bfe5-fdf3b926577f@j18g2000prm.googlegroups.com>

I wrote a twitter client which writes the statuses into a ScrolledText
widget, but it rarely gives a error that I can't nail down. The code
is:

twitwin.scrolled.config(state=NORMAL)
twitwin.scrolled.delete("1.0", END)
evens = True
_.links = []
for x in _.parser.tweets:
    start = _.scrolled.index(INSERT)
    print "start = ",start
    _.scrolled.insert(END, x['screen_name']+" ", ("bold",))
    txt = _.whitere.sub(" ",x['text'])  #the text with whitespace
compressed
    islink = False
    for y in _.urlre.split(txt):  #handle urls
        if y != "":
            if islink:
                a = _.scrolled.index(INSERT)
                _.scrolled.insert(END, y)#, ("link",))
                b = _.scrolled.index(INSERT)
                _.scrolled.tag_add("link", a, b)
                _.scrolled.tag_add("href%d"%len(_.links), a, b)
                _.links.append((a,b,y))  #save url info and position
in the widget
            else:
                _.scrolled.insert(END, y)
        islink = not islink
    _.scrolled.insert(END, "\n")
    if evens:
        _.scrolled.tag_add("light", start, END)  #alternating
background colors
    else:
        _.scrolled.tag_add("dark", start, END)
    evens = not evens
twitwin.scrolled.config(state=DISABLED)

The print statement usually prints a valid index, but rarely prints
"start=None" and it crashes. Should I be using something other than
INSERT or another method here?

Thanks in advance,
-- Rick


From gh at ghaering.de  Fri May  8 02:42:44 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Fri, 08 May 2009 08:42:44 +0200
Subject: update python version
In-Reply-To: <f4cc03640905071932n55999edeyf5546f35b0e45595@mail.gmail.com>
References: <f4cc03640905071932n55999edeyf5546f35b0e45595@mail.gmail.com>
Message-ID: <gu0k94$is9$2@ger.gmane.org>

km wrote:
> Hi all,
> 
> Is there a way to update python 2.6.1 to 2.6.2  using easy_install ?

No, easy_install installs Python packages. It doesn't upgrade Python
itself. If this is Windows, just install the newer Python version. No
need to uninstall the 2.6.1 first.

If this is some Unix variant, hopefully they will provide updated Python
 packages soon.

-- Gerhard



From texaomruzj at hotmail.com  Fri May  8 02:52:43 2009
From: texaomruzj at hotmail.com (texaomruzj at hotmail.com)
Date: Thu, 7 May 2009 23:52:43 -0700 (PDT)
Subject: =?Big5?B?qMisd6aopEi8dq21q7A=?=
Message-ID: <3b546c4b-3808-423d-ab62-d63856df045e@n7g2000prc.googlegroups.com>

<font color=red>????!!????!!????????</font><BR><p>
???:<a href=http://www.ava222.com/ target="_blank">sex369?????</a> -
<BR>
?2?:<a href=http://www.ava666.com/ target="_blank">????????</a> - <BR>
?3?:<a href=http://www.avc222.com/ target="_blank">live173??live?</a>
- <BR>
?4?:<a href=http://www.avc666.com/ target="_blank">0401???</a> - <BR>
?5?:<a href=http://www.avyyy.com/ target="_blank">?????</a> - <BR>
?6?:<a href=http://www.avggg.com/ target="_blank">???????</a> - <BR>
?7?:<a href=http://www.avuuu.com/ target="_blank">??????</a> - <BR>
?8?:<a href=http://www.avrrr.com/ target="_blank">???????</a> - <BR>
?9?:<a href=http://www.avc888.com/ target="_blank">mm158????</a> -
<BR>
?10?:<a href=http://a4.j0401.com/ target="_blank">?????</a> - <BR><p>
<a href="http://www.a0925.com/" target=_blank><img src="http://www.
6cc.tw/01/12345.gif" align=center border=0 /></a>- <BR>
<a href="http://www.avyyy.com/"><img height=120 src="http://av0401.com/
55123002.gif" width="460" height="102"></a></td>


From lie.1296 at gmail.com  Fri May  8 03:16:59 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Fri, 08 May 2009 07:16:59 GMT
Subject: Simple programme - Just want to know whether this is correct
	way of  coding
In-Reply-To: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
Message-ID: <L%QMl.9538$y61.6494@news-server.bigpond.net.au>

guptha wrote:
> Hi group,
> This is my first programme in python ,I need to know whether my code
> is in the right path of performance
> 
> I wrote a code using multithreading to send mails

Can't you use BCC?

> The code Works fine ,but I doubt about the performance issue ,My
> intention is to send mails concurrently to large number of mail.
> 1.For every mail id i send It creates a new SMTP object,in case, if i
> send to 1000 or more ids
>       a) It obliviously creates that much SMPT connections ,is this a
> right approach .
> Thanks in Advance

In a lot of cases involving internet, the bottleneck would be internet 
speed. And for most purpose (except spamming) it is not really that 
necessary to send so much email in so little time (assuming you send 1 
mail per second -- which is really slow considering today's processor 
and internet speed -- you can send 86400 mails per day). Larger mailing 
list can also use BCC.


From __peter__ at web.de  Fri May  8 03:19:13 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 08 May 2009 09:19:13 +0200
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
Message-ID: <gu0mdh$v8v$02$1@news.t-online.com>

Mark Summerfield wrote:

> I had a quick search & didn't find anything _nice_ that produced
> attributes with really private data, so I came up with a possible
> solution---for Python 3.

Do really you think what you suggest below is "nice"?

By the way, your Attribute descriptor stores the value for all instances of 
A in the same variable...

Peter




From davea at ieee.org  Fri May  8 03:25:56 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 08 May 2009 03:25:56 -0400
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
Message-ID: <4A03DE84.40406@ieee.org>

Li Wang wrote:
> Hi all:
>
> I am trying to read a non-text file as a string by using Python
> read(), however, it seems there is some thing wrong with it. I can use
> read() on text file correctly, but unable to read .xls file correctly.
> (The program can read any file correctly in Fedora 10)
>
> Any idea how to solve this problem?
>
> Thank you very much!
>
>   
Chances are you forgot the "b" parameter to open().  Unnecessary in 
Unix, it tells the library to *not* translate \r\n  to \n upon read, or 
the inverse on write.  In other words, with the "b" parameter, the file 
is read in unchanged.

        infile = open(filename, "rb")
       ....




From rustompmody at gmail.com  Fri May  8 03:46:05 2009
From: rustompmody at gmail.com (Rustom Mody)
Date: Fri, 8 May 2009 13:16:05 +0530
Subject: xml in python
Message-ID: <f46c52560905080046t4b9611vb304df22703eb744@mail.gmail.com>

Can someone give me a heads up on xml parsing in python?
The context is that I want to write a simple docbook to text converter.
DOM is alright -- dont want to break my head with SAX just for performance
when my documents are not likely to be large.

My problem is that there seems to be so many nearly equivalent ways (Pyxml?
Amara?) some of which have moved from 3rd party to builtin status that I am
not clear what is the current method of choice.

Thanks
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From __peter__ at web.de  Fri May  8 03:54:30 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 08 May 2009 09:54:30 +0200
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
Message-ID: <gu0ofm$oj9$00$1@news.t-online.com>

Nick wrote:

>         self.cursor = self.connection.cursor()
>         first = True
>         for row in reader:
>             if first:
>                 headers = []
>                 for r in row:
>                     n = r.strip().replace (' ', '_').replace ('-','_')
>                     headers.append (n)
>                 command = 'create table csv (%s)' % ','.join (headers)
>                 self.cursor.execute (command)
>                 first = False
>             else:
>                 command = 'insert into csv values ("%s")' % '","'.join
> (row)
>                 self.cursor.execute (command)
> 

You can simplify that a bit:

cursor = self.cursor = self.connection.cursor()

first_row = next(reader)
headers = [column.strip().replace(" ", "_").replace("-", "_") for column in 
first_row]
cursor.execute("create table csv (%s)" % ", ".join(headers))

placeholders = ", ".join("?"*len(headers))
command = "insert into csv values (%s)" % placeholders
cursor.executemany(command, reader)

While it may not matter here using placeholders instead of manually escaping 
user-provided values is a good habit to get into.

>         self.cursor.execute (self.query)
>         rows = self.cursor.fetchall()
  
rows = self.cursor.execute(self.query)

doesn't build an intermediate list.

>         i = 0
>         for row in rows:
>             results.add (row, i)
>             i = i + 1
 
This is written

for i, row in enumerate(rows):
    results.add(row, i)

in idiomatic Python.

Peter



From davea at ieee.org  Fri May  8 04:02:21 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 08 May 2009 04:02:21 -0400
Subject: Simple programme - Just want to know whether this is correct
	way of 	coding
In-Reply-To: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
Message-ID: <4A03E70D.305@ieee.org>

guptha wrote:
> Hi group,
> This is my first programme in python ,I need to know whether my code
> is in the right path of performance
>
> I wrote a code using multithreading to send mails
>
> FROM = '....com'
>
> SUBJECT = 'This is the subject'
> MSGBODY = 'This the body of the message '
> MAILSERVER = 'mail....com'
> port = 25
> username = 'username'
> password = 'pass'
>
> # trim the strings of any leading or trailing spaces
> FROM = FROM.strip()
> SUBJECT = SUBJECT.strip()
> MSGBODY = MSGBODY.strip()
> MAILSERVER = MAILSERVER.strip()
> username = username.strip()
> password = password.strip()
>
>
> # set up email parameters
> msg = MIMEMultipart()
> msg['From'] = FROM
> msg['Subject'] = SUBJECT
>
> #--------------------------------------------------
> print "Starting Multi Thread Method"
>
> class MyThread(Thread):
>
>     def __init__(self, site,  FROM, MSGBODY):
>         Thread.__init__(self)
>         self.site = site
> 	self.FROM=FROM
> 	self.MSGBODY=MSGBODY
>
>     def run(self):
> 	#Connect to server
> 	print 'Connecting to mail server ', MAILSERVER
> 	try:
> 		s = smtplib.SMTP(MAILSERVER,port)
> 		print 'connected'
> 	#s.set_debuglevel(1)
> 	except:
> 		print 'ERROR: Unable to connect to mail server', sys.exc_info	()[0]
> 	 	sys.exit(1)
>
> 	#login to server
> 	if password <> '':
> 		print 'Logging into mail server'
> 		try:
> 			s.login(username,password)
> 		except:
> 			print 'ERROR: Unable to login to mail server', MAILSERVER
> 			print 'Please recheck your password'
> 			sys.exit(1)
> 	print "running for %s " %self.site
> 	print s
> 	s.sendmail(self.FROM, self.site, self.MSGBODY)
> 	print "from %s" %self.FROM
> 	print "msg %s" %self.MSGBODY
>  	print "Emailed for  site %s" %self.site
> 	s.quit()
> 	s.close()
>
>
> a= time.time()
> threads = []
>
> for site in listTo:
>     T = MyThread(site,FROM,MSGBODY)
>     threads.append(T)
>     T.start()
>
>
> for i in threads:
>     i.join()
>
> print "Took %s seconds" %str(time.time()-a)
>
> #-----------------------------------------------------
>
> The code Works fine ,but I doubt about the performance issue ,My
> intention is to send mails concurrently to large number of mail.
> 1.For every mail id i send It creates a new SMTP object,in case, if i
> send to 1000 or more ids
>       a) It obliviously creates that much SMPT connections ,is this a
> right approach .
> Thanks in Advance
>
>   
Any program that launches multiple threads is not a "simple program," 
especially for a first time user.

I don't know smtplib at all, so these questions may be off-base.  First, 
sendmail() takes as its second argument a list of to_addr, so why not 
send these all as a single operation?  If that would work, this would 
degenerate into a much simpler program.  More importantly, it should 
generate much less traffic between your machine and your smtp server, 
and probably less traffic between that server and the actual destination 
domains.  I have to assume that if it's a single sendmail request, the 
server would then batch-send them to each unique domain in the to_addrs 
list.    Anyway, what if the message body be a couple of megabytes, and 
you're sending it to 100 people?  Sending a single message with a list 
in to_list would save tons of time.

Second, if you do have to send them all separately (for example, if you 
had different mail_options, which you don't yet), then I question the 
need or workability of using a separate thread for all of them.  Trying 
to open  1000 threads is very resource hungry,  Trying to open that many 
smtp connections is even worse.  One of these is likely to fail.  And 
I'm guessing that beyond 10 or so, it'd run at least as fast with a 
different approach.


If I had to do something like this, I'd expect to wind up with some 
number (say 10) of threads, and a queue of things for them to do.  So if 
you had 1000 things, each thread would do approximately 100 of them.  
Now, sharing a queue like that is more work, with more things to mess 
up.  Currently your threads share only read-only data, which makes 
threads pretty straightforward.




From soumen08 at gmail.com  Fri May  8 04:12:30 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Fri, 8 May 2009 13:42:30 +0530
Subject: confused with subprocess.Popen
Message-ID: <f6a09c160905080112x2620169fk9249e9469be607ea@mail.gmail.com>

Hello,
for a certain app, i used to use a command:
os.system("soundwrapper espeak -f line.txt")
now, if i wanted to kill espeak, i would have to run:
os.system("killall espeak")
since the subprocess module allows sending SIGKILL to the process, i
decided to switch to using it. However i cant pass the spaced out
arguments to it. For example:
a=subprocess.Popen("soundwrapper espeak -f line.txt")
results in a OSError, no such file or directory.
How do i use the Popen function?
Regards
Soumen


From li.wang.d at gmail.com  Fri May  8 04:14:16 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 8 May 2009 18:14:16 +1000
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <50697b2c0905072238o6a00fc07ibc92423926313131@mail.gmail.com>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
	<50697b2c0905072238o6a00fc07ibc92423926313131@mail.gmail.com>
Message-ID: <11aabe3b0905080114ma4efb2dv7879e64104e0f7f4@mail.gmail.com>

2009/5/8 Chris Rebert <clp2 at rebertia.com>:
> On Thu, May 7, 2009 at 10:04 PM, Li Wang <li.wang.d at gmail.com> wrote:
>> Hi all:
>>

> the file, e.g. open("the_file.xls", "rb")
> Unlike *nix, Windows differentiates between binary and text files,
> hence the need for the "b" flag to specify which you're dealing with.

Hi
Thank you very much for reply,

The method doesn't work.
Here is the problem: after reading the whole fie as a string, I need
the string to be made of 8bits-symbols.

I do not mind what's the content in the file, what I need to do is
something like reading the file byte by byte and concatenate these
bytes into a single string.

Any suggestions?

Thank you very much





-- 
Li
------
Time is all we have
and you may find one day
you have less than you think


From dotancohen at gmail.com  Fri May  8 04:21:40 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Fri, 8 May 2009 11:21:40 +0300
Subject: What would YOU like to see in a txt to html converter?
In-Reply-To: <gtv9ik$qes$1@news-cedar.fernuni-hagen.de>
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
	<87my9okc1q.fsf@lakeside.sjtu.edu.cn>
	<gtv9ik$qes$1@news-cedar.fernuni-hagen.de>
Message-ID: <880dece00905080121o6d63b49ap9f51b5fa5fbf5264@mail.gmail.com>

> I already thought of using dots or asterisks
> or whatever to let the user format the text instead of using html tags (this
> would be quite paradox ;-)
>

Then please do not invent another wheel. Write a markdown parser:
http://en.wikipedia.org/wiki/Markdown

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il


From jeremiah.dodds at gmail.com  Fri May  8 04:31:07 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Fri, 8 May 2009 09:31:07 +0100
Subject: Web Based Front End?
In-Reply-To: <18804639-32ae-4bdf-9ecc-4c8b21f8a43f@g19g2000vbi.googlegroups.com>
References: <18804639-32ae-4bdf-9ecc-4c8b21f8a43f@g19g2000vbi.googlegroups.com>
Message-ID: <12cbbbfc0905080131g5c48d15oab489e06318150ac@mail.gmail.com>

On Fri, May 8, 2009 at 2:52 AM, <baseelinger at yahoo.com> wrote:

> So, my question is what is the best method to be able to have a user
> enter specific data on a web page, have that data be passed to the
> Python script and then have the output returned to the web page?
> Essentially, I want to use a web based front end to accomplish the
> same thing that the IDLE GUI does, (asks me a few questions, I answer
> them, it builds a configuration file and prints it to the screen).
>
>
There isn't a best way, really.

I'm partial to CherryPy. A minimal example would look like so:

-------------------------------
import cherrypy

class Root(object):
    page = "<html><head><title></title></head><body>%s</body></html>"
    @cherrypy.expose
    def enter_data(self, data):
        return self.page % ("You entered: " + data,)

    @cherrypy.expose
    def index(self):
        form = """
        <form id="aform" name="aform" action="enter_data" method="POST">
          <textarea name="data">Enter some stuff here</textarea>
          <input type="submit" value="Submit"/>
        </form>
        """
        return self.page % form

if __name__ == '__main__':
    cherrypy.quickstart(Root())

-----------------------------------

Note, I wouldn't actually recommend using string building like that for
returning pages unless your app is seriously trivial. I use Genshi for
templating, the tutorial that they have is very nice (and uses cherrypy).

There's a plethora of different ways to build web apps in python. In all
reality, you should probably try out a few and see what suits your tastes.
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From piet at cs.uu.nl  Fri May  8 04:49:39 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 08 May 2009 10:49:39 +0200
Subject: SimpleXMLRPCServer and creating a new object on for each new
	client request.
References: <mailman.5173.1241647285.11746.python-list@python.org>
	<m2ab5ojyff.fsf@cs.uu.nl>
Message-ID: <m24ovwj7x8.fsf@cs.uu.nl>

>>>>> Piet van Oostrum <piet at cs.uu.nl> (PvO) wrote:

>>>>> Jelle Smet <jelle at smetj.net> (JS) wrote:
>PvO> One more thing:

>JS> I start python interactively:
>>>>> import xmlrpclib
>>>>> session1=xmlrpclib.ServerProxy('http://localhost:8000')
>>>>> session2=xmlrpclib.ServerProxy('http://localhost:8000')
>>>>> print session1.show_random()
>JS> 13930
>>>>> print session2.show_random()
>JS> 13930
>>>>> 

>PvO> I get the impression, also from your use of the variable names
>PvO> 'session1' and 'session2' that xmlrpclib.ServerProxy() gives you some
>PvO> kind of connection to the XMLRPC server. 

This should have been: I get the impression, also from your use of the
variable names 'session1' and 'session2', *that you think* that
xmlrpclib.ServerProxy() gives you some kind of connection to the XMLRPC
server.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From pavlovevidence at gmail.com  Fri May  8 04:52:31 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 8 May 2009 01:52:31 -0700 (PDT)
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
Message-ID: <d3f28469-3eeb-4b59-be57-66053e03fd44@n7g2000prc.googlegroups.com>

On May 7, 11:37?pm, Mark Summerfield <l... at qtrac.plus.com> wrote:
> Hi,
>
> I had a quick search & didn't find anything _nice_ that produced
> attributes with really private data, so I came up with a possible
> solution---for Python 3.
> (For Python 2 there does seem to be an approach although I'm not
> keen on it:http://www.builderau.com.au/blogs/byteclub/viewblogpost.htm?p=339270875
> )
>
> Here's a standard class with one read-only and one writable
> property that has a tiny bit of validation.
>
> class P:
> ? ? def __init__(self, w):
> ? ? ? ? self.w = w
> ? ? @property
> ? ? def r(self): return 5
> ? ? @property
> ? ? def w(self): return self.__w
> ? ? @w.setter
> ? ? def w(self, value):
> ? ? ? ? if value > 0: # Only +ve values allowed
> ? ? ? ? ? ? self.__w = value
> ? ? ? ? else:
> ? ? ? ? ? ? raise ValueError("'{0}' is not valid for w".format(value))
>
> The read-only property is completely private because it isn't
> actually stored as such.
>
> But if we do dir() on an instance, in addition to 'r' and 'w', we
> also have '_P__w'. So the writable property's data is easily
> accessible, and the validation can be got around:
>
> >>> p = P(9)
> >>> p.r, p.w
> (5, 9)
> >>> p.w = 43
> >>> p.r, p.w
> (5, 43)
> >>> p.w = -7
>
> Traceback (most recent call last):
> ...
> ValueError: '-7' is not valid for w>>> p._P__w = -7
> >>> p.r, p.w
>
> (5, -7)
>
> Here's a class where I can't think of a way to access the private
> data and set invalid values.
>
> class A:
> ? ? r = Attribute("r", 5)
> ? ? w = Attribute("w", None, lambda self, value: value > 0)
> ? ? def __init__(self, w):
> ? ? ? ? self.w = w
>
> The Attribute class is a descriptor that takes three arguments:
> name of attribute, initial value (essential for read-only
> attributes!), and a validator function (which could be "lambda
> *a: True" if any value is accepatble).
>
> >>> a = A(9)
> >>> a.r, a.w
> (5, 9)
> >>> a.w = 43
> >>> a.r, a.w
> (5, 43)
> >>> a.w = -7
>
> Traceback (most recent call last):
> ...
> ValueError: '-7' is not valid for w
>
> If we do a dir(a) the only attributes we get (beyond those from
> object) are 'r' and 'w', so it shouldn't be possible to get
> around the validation---at least not easily.

Ok, I'll bite.

A.w = -7

A.__class__ = A_without_validation
a.w = -7

Attribute.__set__ = function_that_ignores_validation
a.w = -7


I am not opposed to adding a little well-considered protection to some
attributes where mistakes are prone to happen and/or dangerous, but it
is futile to try to stop access entirely.  There's just too many back
doors.

I would suggest that there really isn't much point in anything more
complex than your first solution, which was to validate with
properties and to store the value in a separate attribute.
Respectable programmers won't lightly bypass your validation if they
see that you've taken steps to enforce it.  OTOH, once a programmer,
respectable or not, decides to override your protection, they are not
likely to be stopped by something more complex.  So there is no point
in making it more complex.


Carl Banks


From li.wang.d at gmail.com  Fri May  8 05:04:34 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 8 May 2009 19:04:34 +1000
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <11aabe3b0905080114ma4efb2dv7879e64104e0f7f4@mail.gmail.com>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
	<50697b2c0905072238o6a00fc07ibc92423926313131@mail.gmail.com>
	<11aabe3b0905080114ma4efb2dv7879e64104e0f7f4@mail.gmail.com>
Message-ID: <11aabe3b0905080204w1aee64d1ma587cbeb45720876@mail.gmail.com>

Hi:

Problem solved

Thank you very much, it works, It is my own problem:)

All the best,
Li

2009/5/8 Li Wang <li.wang.d at gmail.com>:
> 2009/5/8 Chris Rebert <clp2 at rebertia.com>:
>> On Thu, May 7, 2009 at 10:04 PM, Li Wang <li.wang.d at gmail.com> wrote:
>>> Hi all:
>>>
>
>> the file, e.g. open("the_file.xls", "rb")
>> Unlike *nix, Windows differentiates between binary and text files,
>> hence the need for the "b" flag to specify which you're dealing with.
>
> Hi
> Thank you very much for reply,
>
> The method doesn't work.
> Here is the problem: after reading the whole fie as a string, I need
> the string to be made of 8bits-symbols.
>
> I do not mind what's the content in the file, what I need to do is
> something like reading the file byte by byte and concatenate these
> bytes into a single string.
>
> Any suggestions?
>
> Thank you very much
>
>
>
>
>
> --
> Li
> ------
> Time is all we have
> and you may find one day
> you have less than you think
>



-- 
Li
------
Time is all we have
and you may find one day
you have less than you think


From li.wang.d at gmail.com  Fri May  8 05:08:03 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 8 May 2009 19:08:03 +1000
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <4A03DE84.40406@ieee.org>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
	<4A03DE84.40406@ieee.org>
Message-ID: <11aabe3b0905080208x5df4df5bu4eec2712d842320@mail.gmail.com>

Hi  Dave:
Thank you very much for you explanation:)


> Chances are you forgot the "b" parameter to open().  Unnecessary in Unix, it
> tells the library to *not* translate \r\n  to \n upon read, or the inverse
> on write.  In other words, with the "b" parameter, the file is read in
> unchanged.

So, if I am using python in Linux, do open('file', 'r') and
open('file', 'rb') work the same way?

Thanks,

Best regards,
Li


From piet at cs.uu.nl  Fri May  8 05:12:21 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 08 May 2009 11:12:21 +0200
Subject: Simple programme - Just want to know whether this is correct way
	of coding
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
Message-ID: <m2ws8shsay.fsf@cs.uu.nl>

>>>>> guptha <gjango.py at gmail.com> (g) wrote:

>g> Hi group,
>g> This is my first programme in python ,I need to know whether my code
>g> is in the right path of performance

>g> I wrote a code using multithreading to send mails

>g> FROM = '....com'

>g> SUBJECT = 'This is the subject'
>g> MSGBODY = 'This the body of the message '
>g> MAILSERVER = 'mail....com'
>g> port = 25
>g> username = 'username'
>g> password = 'pass'

>g> # trim the strings of any leading or trailing spaces
>g> FROM = FROM.strip()
>g> SUBJECT = SUBJECT.strip()
>g> MSGBODY = MSGBODY.strip()
>g> MAILSERVER = MAILSERVER.strip()
>g> username = username.strip()
>g> password = password.strip()


>g> # set up email parameters
>g> msg = MIMEMultipart()
>g> msg['From'] = FROM
>g> msg['Subject'] = SUBJECT

>g> #--------------------------------------------------
>g> print "Starting Multi Thread Method"

>g> class MyThread(Thread):

>g>     def __init__(self, site,  FROM, MSGBODY):
>g>         Thread.__init__(self)
>g>         self.site = site
>g> 	self.FROM=FROM
>g> 	self.MSGBODY=MSGBODY

>g>     def run(self):
>g> 	#Connect to server
>g> 	print 'Connecting to mail server ', MAILSERVER
>g> 	try:
>g> 		s = smtplib.SMTP(MAILSERVER,port)
>g> 		print 'connected'
>g> 	#s.set_debuglevel(1)
>g> 	except:
>g> 		print 'ERROR: Unable to connect to mail server', sys.exc_info	()[0]
>g> 	 	sys.exit(1)

>g> 	#login to server
>g> 	if password <> '':
>g> 		print 'Logging into mail server'
>g> 		try:
>g> 			s.login(username,password)
>g> 		except:
>g> 			print 'ERROR: Unable to login to mail server', MAILSERVER
>g> 			print 'Please recheck your password'
>g> 			sys.exit(1)
>g> 	print "running for %s " %self.site
>g> 	print s
>g> 	s.sendmail(self.FROM, self.site, self.MSGBODY)
>g> 	print "from %s" %self.FROM
>g> 	print "msg %s" %self.MSGBODY
>g>  	print "Emailed for  site %s" %self.site
>g> 	s.quit()
>g> 	s.close()


>g> a= time.time()
>g> threads = []

>g> for site in listTo:
>g>     T = MyThread(site,FROM,MSGBODY)
>g>     threads.append(T)
>g>     T.start()


>g> for i in threads:
>g>     i.join()

>g> print "Took %s seconds" %str(time.time()-a)

>g> #-----------------------------------------------------

Tuesday this same program with some minor differences was posted by
gganesh <ganesh.gbg at gmail.com>. There was a discussion about that. So
did you copied that program with the suggested changes? I don't think it
is nice to have two parallel discussions on the same subject. And
copying without giving credits is not considered nice behaviour either.
Usually it is called plagiarism.

>g> The code Works fine ,but I doubt about the performance issue ,My
>g> intention is to send mails concurrently to large number of mail.
>g> 1.For every mail id i send It creates a new SMTP object,in case, if i
>g> send to 1000 or more ids
>g>       a) It obliviously creates that much SMPT connections ,is this a
>g> right approach .

For such a big number of mails this is not the right approach. First
your operating system may not like it to have such a large number of
threads active. Second, the mail server probably doesn't like it that
you make such a large number of connections simultaneously. If the mail
server doesn't protest, probably its systems administrator will.
Moreover there is probably no benefit in having 1000 connections open to
the same mail server because long before there will be another
bottleneck such as your network connection or the CPU load of either
your computer or the mail server, unless you are on a very scalable
infrastructure.

A better solution will be to use a Thread Pool with a limited number of
simultaneous threads (my guess is that 10-20 or so would be good
enough).

And as I said to my students yesterday: You shouldn't program
multithreaded applications unless you have studied this subject
thoroughly. Of course I don't know how this applies to you.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From OldGrantonian at googlemail.com  Fri May  8 05:14:55 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Fri, 8 May 2009 02:14:55 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com> 
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com> 
	<Xns9C047FE3D4338duncanbooth@127.0.0.1>
	<3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>
	<mailman.5241.1241726706.11746.python-list@python.org>
	<2be30c71-4eb3-4ad7-a138-31ee0698a297@e20g2000vbc.googlegroups.com>
	<Xns9C04DB348C134duncanbooth@127.0.0.1>
Message-ID: <bcba712c-a945-4f83-a451-b7f9a9eb8a6c@n4g2000vba.googlegroups.com>

On May 7, 9:33?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> OldGrantonian <OldGranton... at googlemail.com> wrote:
> > Where do I find the win32 extensions?
>
> http://www.google.com/search?q=python+win32
>
> Any of the first 4 hits should help.

Success :)

Many thanks to all responders in this thread :)


From OldGrantonian at googlemail.com  Fri May  8 05:15:18 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Fri, 8 May 2009 02:15:18 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com> 
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com> 
	<Xns9C047FE3D4338duncanbooth@127.0.0.1>
	<3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>
	<mailman.5241.1241726706.11746.python-list@python.org>
	<2be30c71-4eb3-4ad7-a138-31ee0698a297@e20g2000vbc.googlegroups.com>
	<Xns9C04DB348C134duncanbooth@127.0.0.1>
Message-ID: <b947bb3c-76db-4cf3-9e44-03cd4715bb63@g19g2000vbi.googlegroups.com>

On May 7, 9:33?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> OldGrantonian <OldGranton... at googlemail.com> wrote:
> > Where do I find the win32 extensions?
>
> http://www.google.com/search?q=python+win32
>
> Any of the first 4 hits should help.

Success :)

Many thanks to all responders in this thread :)


From alan.cameron at iname.com  Fri May  8 05:16:55 2009
From: alan.cameron at iname.com (Alan Cameron)
Date: Fri, 8 May 2009 10:16:55 +0100
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2><fbGMl.6972$hd4.4032@newsfe24.ams2>	<mailman.5238.1241723354.11746.python-list@python.org><lrGMl.6973$hd4.2539@newsfe24.ams2>
	<mailman.5248.1241732704.11746.python-list@python.org>
Message-ID: <WLSMl.4$3C7.0@newsfe30.ams2>

"Terry Reedy" <tjreedy at udel.edu> wrote in message 
news:mailman.5248.1241732704.11746.python-list at python.org...
> Alan Cameron wrote:
>>
>>>>> why is the printed result of
>>>>>
>>>>>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>>>>>> print(basket)
>>>>> {'orange', 'banana', 'pear', 'apple'}
>>>>>
>>>>> in the sequence given?
>
>> It appears that I used a reserved term when I used 'sequence'.
>
> No and Sort-of.
>
> No: We often use it in the normal English sense of ordered items, as I and 
> I think others assume you did.  Your question is quite legitimate, and the 
> answer, as indicated, is how an implementation interacts with the sequence 
> of additions.
>
> Sort-of: The library manual section of Sequence Types lists the sequence 
> operations common to all or most built-in Python sequence classes.  But it 
> does not explicitly define sequence.  Ranges, which are iterables that 
> directly support only indexing and len(), are called sequences. Dicts, 
> which are iterables that support len() but are usually not indexed by 
> integers, are not.  So that suggests a minimal definition of sequence, but 
> all the other sequence classes support much more that is typically 
> assumed.
>
> Keywords are reserved terms in the language such as 'if' and 'None' that 
> are specially recognized by the parser and which affect compilation. 
> Identifiers of the form '__x...y__' are reserved names.  Non-terminal 
> terms in the grammar are reserved terms, in a sense, within the reference 
> manual, but 'expression_list', not 'sequence', is used for comma-separated 
> sequences of expressions in code.  The comma-separated sequence of items 
> in a function call is separately defined as an 'argument_list' because 
> 'keyword_item's like 'a=b' and '*' and '**' are not expressions and 
> because there are some order restrictions on argument items.
>
> Terry Jan Reedy
>

Thanks for the explanation.

In particular reference to the tutorial section
http://docs.python.org/3.0/tutorial/datastructures.html#nested-list-comprehensions

There is a word which is ambiguous, at least to me.

Perhaps you can explain the use of the word 'comprehensions'.

Comprehension I understand
Comprehensions I don't.

Is there a glossary of terms somewhere?

-- 
Alan Cameron 




From koranthala at gmail.com  Fri May  8 05:26:36 2009
From: koranthala at gmail.com (koranthala)
Date: Fri, 8 May 2009 02:26:36 -0700 (PDT)
Subject: Creating temperory files for a web application
Message-ID: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>

Hi,
   I am doing web development using Django. I need to create an image
(chart) and show it to the users - based on some data which user
selects.
   My question is - how do I create a temporary image for the user? I
thought of tempfile, but I think it will be deleted once the process
is done - which would happen by the time user starts seeing the image.
I can think of no other option other than to have another script which
will delete all images based on time of creation.
   Since python is extensively used for web development, I guess this
should be an usual scenario for many people here. How do you usually
handle this?


From bearophileHUGS at lycos.com  Fri May  8 05:44:20 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 8 May 2009 02:44:20 -0700 (PDT)
Subject: heapq.merge with key=
References: <gtvjgk$tm8$1@foggy.unx.sas.com>
Message-ID: <5de878bd-52c4-4b2d-895b-c72f71519b7b@o14g2000vbo.googlegroups.com>

Looking for this, Kevin D. Smith?
http://code.activestate.com/recipes/502295/

Bye,
bearophile


From deets at nospam.web.de  Fri May  8 05:49:41 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 08 May 2009 11:49:41 +0200
Subject: Creating temperory files for a web application
References: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>
Message-ID: <76ideeF1d1gbsU1@mid.uni-berlin.de>

koranthala wrote:

> Hi,
>    I am doing web development using Django. I need to create an image
> (chart) and show it to the users - based on some data which user
> selects.
>    My question is - how do I create a temporary image for the user? I
> thought of tempfile, but I think it will be deleted once the process
> is done - which would happen by the time user starts seeing the image.

What makes you think that? You are the one creating it, you are responsible
for deleting it.

> I can think of no other option other than to have another script which
> will delete all images based on time of creation.
>    Since python is extensively used for web development, I guess this
> should be an usual scenario for many people here. How do you usually
> handle this?

There are various solutions - tempfiles, files based on a criteria (e.g.
username and image-properties) so that they don't pollute the harddrive.

For both approaches cleaning up as you suggest might be needed.

Alternatively, if you use sessions, you can use memory-cached images.

Or you can use the database.

But the cleaning-up might get necessary here as well.

The cleanest solution would be if the image would be rendered on the fly,
based on GET-parameters (or REST-ful urls) so that you can render it into
memory as string, but then forget immediately about it.

Diez


From bvidinli at gmail.com  Fri May  8 06:38:25 2009
From: bvidinli at gmail.com (bvidinli)
Date: Fri, 8 May 2009 13:38:25 +0300
Subject: php to python code converter
Message-ID: <36e8a7020905080338p140a3945if3325c7a83368970@mail.gmail.com>

if anybody needs:
http://code.google.com/p/phppython/


From news.btinternet.com at erik.feegles.net  Fri May  8 06:58:49 2009
From: news.btinternet.com at erik.feegles.net (Basil Brush)
Date: Fri, 08 May 2009 11:58:49 +0100
Subject: Compiling snippets of python code
Message-ID: <RNOdnWjWTNq2jZnXnZ2dnUVZ8g6dnZ2d@bt.com>


I need some advice on compiling snippets of python source at runtime. So
perhaps some python experts can point the way.

I am rewriting an old Java app in python. It tries to find solutions to
computational problems based on the idea of genetic evolution. The Java
version just used an array of bytes for the genomes. These byte
sequences were bytecode which told a rudimentary VM (virtual machine)
which maths functions to call. It used another array as a small chunk of
virtual memory for doing the calculations.

Having seen the docs on python's compile module, I'm thinking of doing
it differently in the new python version. My aim is to have the genomes
made up of a sequence of python source snippets, with each snippet to be
randomly generated, compiled, and executed at runtime. The advantage of
this is that it gives me greater flexibility and I can change what
actions the genomes can do without having to add new functions to my VM.

But there's some crucial points. When the snippet is executed I would
need to pass in a list or array, and I need the list back again with any
changes that were made; this is the virtual memory and how I would get
the results back, and is also how the snippet would get data from a
previous snippet in a sequence. How would I do this? Also, there is a
database of input data. Rather than pass all that data to the snippet
I'd rather have functions in my module which the snippet could call to
get data. So what's the scope of an executing piece of code? Can it
access my modules and functions?

My linux system has python 2.5 and I noticed that the docs say the
compile module has been removed from python 3.0. So I'm concerned about
whether my app would work in 3.0 if I upgraded. Does anyone know if they
moved the compiler to another module or simply removed it entirely?


From ldo at geek-central.gen.new_zealand  Fri May  8 07:10:12 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 08 May 2009 23:10:12 +1200
Subject: IIR filter conversion routines for Python?
References: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>
Message-ID: <gu13uk$iek$3@lust.ihug.co.nz>

In message <af91e679-
e8cf-4db5-9c88-6436e520ce4e at z7g2000vbh.googlegroups.com>, wzab wrote:

> I'm looking for procedures converting the IIR filters into cascade and/
> or parallel forms.

Tried a DSP textbook?



From ldo at geek-central.gen.new_zealand  Fri May  8 07:11:52 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 08 May 2009 23:11:52 +1200
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
	<gu0ofm$oj9$00$1@news.t-online.com>
Message-ID: <gu141o$iek$4@lust.ihug.co.nz>

In message <gu0ofm$oj9$00$1 at news.t-online.com>, Peter Otten wrote:

> While it may not matter here using placeholders instead of manually
> escaping user-provided values is a good habit to get into.

Until you hit things it can't deal with.



From micpringle at gmail.com  Fri May  8 07:39:38 2009
From: micpringle at gmail.com (Mic Pringle)
Date: Fri, 8 May 2009 12:39:38 +0100
Subject: String.Template Source ...
Message-ID: <51e08b630905080439u5ea51117j2dcaafe9b11eeb05@mail.gmail.com>

Hi,

I'd like to have a 'dig around' in the source for String.Template, but
can't seem to find where it lives.

Could someone please let me know where about's in the source (perhaps
a path?) the template functions live ?

I'm working on a Mac, using Leopard and the bundled version of Python.

Thanks

-Mic


From koranthala at gmail.com  Fri May  8 08:22:44 2009
From: koranthala at gmail.com (koranthala)
Date: Fri, 8 May 2009 05:22:44 -0700 (PDT)
Subject: Creating temperory files for a web application
References: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>
	<76ideeF1d1gbsU1@mid.uni-berlin.de>
Message-ID: <354db318-25b3-4af1-8fb1-cd86a0695637@x31g2000prc.googlegroups.com>

On May 8, 2:49?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> koranthala wrote:
> > Hi,
> > ? ?I am doing web development using Django. I need to create an image
> > (chart) and show it to the users - based on some data which user
> > selects.
> > ? ?My question is - how do I create a temporary image for the user? I
> > thought of tempfile, but I think it will be deleted once the process
> > is done - which would happen by the time user starts seeing the image.
>
> What makes you think that? You are the one creating it, you are responsible
> for deleting it.
>
> > I can think of no other option other than to have another script which
> > will delete all images based on time of creation.
> > ? ?Since python is extensively used for web development, I guess this
> > should be an usual scenario for many people here. How do you usually
> > handle this?
>
> There are various solutions - tempfiles, files based on a criteria (e.g.
> username and image-properties) so that they don't pollute the harddrive.
>
> For both approaches cleaning up as you suggest might be needed.
>
> Alternatively, if you use sessions, you can use memory-cached images.
>
> Or you can use the database.
>
> But the cleaning-up might get necessary here as well.
>
> The cleanest solution would be if the image would be rendered on the fly,
> based on GET-parameters (or REST-ful urls) so that you can render it into
> memory as string, but then forget immediately about it.
>
> Diez

Thank you Diez.
I would like to go ahead with the cleanest solution indeed.
I am creating the image on the fly. But I could not understand what
you meant by render to memory as a string.
How do we send the image to the browser?

Were you mentioning about having the image as a string and then
passing to the browser based on data URL scheme <RFC 2397> ?
Or is it something else like XBM format or something? I am sorry - but
I am quite unsure of what you meant?

I am actually creating PDFs, CSVs and images on the fly. So, I need to
delete them all after that.
The images can be somewhat large - ~2MB. The RFC mentions that large
data cannot be sent that way.

Is it that I will have to delete the images using a separate script
later?



From __peter__ at web.de  Fri May  8 08:23:53 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 08 May 2009 14:23:53 +0200
Subject: String.Template Source ...
References: <mailman.5283.1241784737.11746.python-list@python.org>
Message-ID: <gu188n$kb8$03$1@news.t-online.com>

Mic Pringle wrote:

> I'd like to have a 'dig around' in the source for String.Template, but
> can't seem to find where it lives.

I assume that you mean string.Template.

> Could someone please let me know where about's in the source (perhaps
> a path?) the template functions live ?
> 
> I'm working on a Mac, using Leopard and the bundled version of Python.

Import the module and inspect its __file__ attribute:

>>> import string
>>> string.__file__
'/usr/lib/python2.6/string.pyc'

This means that the string module's path is /usr/lib/python2.6/string.py 
over here.



From micpringle at gmail.com  Fri May  8 08:33:33 2009
From: micpringle at gmail.com (Mic Pringle)
Date: Fri, 8 May 2009 13:33:33 +0100
Subject: String.Template Source ...
In-Reply-To: <gu188n$kb8$03$1@news.t-online.com>
References: <mailman.5283.1241784737.11746.python-list@python.org>
	<gu188n$kb8$03$1@news.t-online.com>
Message-ID: <51e08b630905080533j6624dc8cy9886bbe49dc9d46a@mail.gmail.com>

Brilliant, thanks Peter.

-Mic

2009/5/8 Peter Otten <__peter__ at web.de>:
> Mic Pringle wrote:
>
>> I'd like to have a 'dig around' in the source for String.Template, but
>> can't seem to find where it lives.
>
> I assume that you mean string.Template.
>
>> Could someone please let me know where about's in the source (perhaps
>> a path?) the template functions live ?
>>
>> I'm working on a Mac, using Leopard and the bundled version of Python.
>
> Import the module and inspect its __file__ attribute:
>
>>>> import string
>>>> string.__file__
> '/usr/lib/python2.6/string.pyc'
>
> This means that the string module's path is /usr/lib/python2.6/string.py
> over here.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From list at qtrac.plus.com  Fri May  8 08:34:40 2009
From: list at qtrac.plus.com (Mark Summerfield)
Date: Fri, 8 May 2009 05:34:40 -0700 (PDT)
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
	<gu0mdh$v8v$02$1@news.t-online.com>
Message-ID: <5a532192-3e70-48d4-99b8-c8c75c3ef7cb@t10g2000vbg.googlegroups.com>

On 8 May, 08:19, Peter Otten <__pete... at web.de> wrote:
> MarkSummerfieldwrote:
> > I had a quick search & didn't find anything _nice_ that produced
> > attributes with really private data, so I came up with a possible
> > solution---for Python 3.
>
> Do really you think what you suggest below is "nice"?

Well the code isn't ugly and doesn't mess with the call stack etc.

> By the way, your Attribute descriptor stores the value for all instances of
> A in the same variable...

It seems like it does, but it doesn't. The hidden_value is an instance
variable that is created every time an Attribute object is created.

>>> from Attribute import *
>>> class A:
	a = Attribute("a", 5, lambda *a: True)
	b = Attribute("b", 5, lambda *a: True)
>>> class B:
	a = Attribute("a", 5, lambda *a: True)
	b = Attribute("b", 5, lambda *a: True)
>>> a = A()
>>> b = B()
>>> a.a,a.b,b.a,b.b
(5, 5, 5, 5)
>>> a.a=1;a.b=2;b.a=3;b.b=4
>>> a.a,a.b,b.a,b.b
(1, 2, 3, 4)

--
Mark Summerfield, Qtrac Ltd, www.qtrac.eu
    C++, Python, Qt, PyQt - training and consultancy
        "Programming in Python 3" - ISBN 0137129297


From koranthala at gmail.com  Fri May  8 08:38:44 2009
From: koranthala at gmail.com (koranthala)
Date: Fri, 8 May 2009 05:38:44 -0700 (PDT)
Subject: Creating temperory files for a web application
References: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>
	<76ideeF1d1gbsU1@mid.uni-berlin.de>
	<354db318-25b3-4af1-8fb1-cd86a0695637@x31g2000prc.googlegroups.com>
Message-ID: <275bb932-644b-4f64-80e8-7061ec7b2dff@a5g2000pre.googlegroups.com>

On May 8, 5:22?pm, koranthala <koranth... at gmail.com> wrote:
> On May 8, 2:49?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
>
>
> > koranthala wrote:
> > > Hi,
> > > ? ?I am doing web development using Django. I need to create an image
> > > (chart) and show it to the users - based on some data which user
> > > selects.
> > > ? ?My question is - how do I create a temporary image for the user? I
> > > thought of tempfile, but I think it will be deleted once the process
> > > is done - which would happen by the time user starts seeing the image.
>
> > What makes you think that? You are the one creating it, you are responsible
> > for deleting it.
>
> > > I can think of no other option other than to have another script which
> > > will delete all images based on time of creation.
> > > ? ?Since python is extensively used for web development, I guess this
> > > should be an usual scenario for many people here. How do you usually
> > > handle this?
>
> > There are various solutions - tempfiles, files based on a criteria (e.g.
> > username and image-properties) so that they don't pollute the harddrive.
>
> > For both approaches cleaning up as you suggest might be needed.
>
> > Alternatively, if you use sessions, you can use memory-cached images.
>
> > Or you can use the database.
>
> > But the cleaning-up might get necessary here as well.
>
> > The cleanest solution would be if the image would be rendered on the fly,
> > based on GET-parameters (or REST-ful urls) so that you can render it into
> > memory as string, but then forget immediately about it.
>
> > Diez
>
> Thank you Diez.
> I would like to go ahead with the cleanest solution indeed.
> I am creating the image on the fly. But I could not understand what
> you meant by render to memory as a string.
> How do we send the image to the browser?
>
> Were you mentioning about having the image as a string and then
> passing to the browser based on data URL scheme <RFC 2397> ?
> Or is it something else like XBM format or something? I am sorry - but
> I am quite unsure of what you meant?
>
> I am actually creating PDFs, CSVs and images on the fly. So, I need to
> delete them all after that.
> The images can be somewhat large - ~2MB. The RFC mentions that large
> data cannot be sent that way.
>
> Is it that I will have to delete the images using a separate script
> later?

Hi Diez,
   I think I understood your point now.
   Is it ?
   (1) Have a separate URL for the image - update urls.py for that
   (2) Pass all the GET parameters to that URL again.
   (3) Recalculate the fields again in that URL
   (4) Create the image and send back as image/png based on the
received fields.
   Other than the fact that I will be hitting the DB twice - for the
fields in the original URL and for creating Image in the second URL, I
think this is the best option.
   Please let me know whether I have understood correctly.

   The same option can be done for CSV and PDF files too. Thank you
very much Diez.


From list at qtrac.plus.com  Fri May  8 08:44:19 2009
From: list at qtrac.plus.com (Mark Summerfield)
Date: Fri, 8 May 2009 05:44:19 -0700 (PDT)
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
	<d3f28469-3eeb-4b59-be57-66053e03fd44@n7g2000prc.googlegroups.com>
Message-ID: <450ca2c0-1982-4554-8e28-1490c6c06510@q2g2000vbr.googlegroups.com>

On 8 May, 09:52, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 7, 11:37?pm, MarkSummerfield<l... at qtrac.plus.com> wrote:
>
>
>
> > Hi,
>
> > I had a quick search & didn't find anything _nice_ that produced
> > attributes with really private data, so I came up with a possible
> > solution---for Python 3.
> > (For Python 2 there does seem to be an approach although I'm not
> > keen on it:http://www.builderau.com.au/blogs/byteclub/viewblogpost.htm?p=339270875
> > )
>
> > Here's a standard class with one read-only and one writable
> > property that has a tiny bit of validation.
>
> > class P:
> > ? ? def __init__(self, w):
> > ? ? ? ? self.w = w
> > ? ? @property
> > ? ? def r(self): return 5
> > ? ? @property
> > ? ? def w(self): return self.__w
> > ? ? @w.setter
> > ? ? def w(self, value):
> > ? ? ? ? if value > 0: # Only +ve values allowed
> > ? ? ? ? ? ? self.__w = value
> > ? ? ? ? else:
> > ? ? ? ? ? ? raise ValueError("'{0}' is not valid for w".format(value))
>
> > The read-only property is completely private because it isn't
> > actually stored as such.
>
> > But if we do dir() on an instance, in addition to 'r' and 'w', we
> > also have '_P__w'. So the writable property's data is easily
> > accessible, and the validation can be got around:
>
> > >>> p = P(9)
> > >>> p.r, p.w
> > (5, 9)
> > >>> p.w = 43
> > >>> p.r, p.w
> > (5, 43)
> > >>> p.w = -7
>
> > Traceback (most recent call last):
> > ...
> > ValueError: '-7' is not valid for w>>> p._P__w = -7
> > >>> p.r, p.w
>
> > (5, -7)
>
> > Here's a class where I can't think of a way to access the private
> > data and set invalid values.
>
> > class A:
> > ? ? r = Attribute("r", 5)
> > ? ? w = Attribute("w", None, lambda self, value: value > 0)
> > ? ? def __init__(self, w):
> > ? ? ? ? self.w = w
>
> > The Attribute class is a descriptor that takes three arguments:
> > name of attribute, initial value (essential for read-only
> > attributes!), and a validator function (which could be "lambda
> > *a: True" if any value is accepatble).
>
> > >>> a = A(9)
> > >>> a.r, a.w
> > (5, 9)
> > >>> a.w = 43
> > >>> a.r, a.w
> > (5, 43)
> > >>> a.w = -7
>
> > Traceback (most recent call last):
> > ...
> > ValueError: '-7' is not valid for w
>
> > If we do a dir(a) the only attributes we get (beyond those from
> > object) are 'r' and 'w', so it shouldn't be possible to get
> > around the validation---at least not easily.
>
> Ok, I'll bite.
>
> A.w = -7
>
> A.__class__ = A_without_validation
> a.w = -7
>
> Attribute.__set__ = function_that_ignores_validation
> a.w = -7

I don't see how that can work? Sure you could replace the __set__
method, or the Attribute.__setter method. But neither can actually
change the hidden_value because AFAIK that only exists within the
scope of a closure and so isn't accesssible. (Well, maybe if you
started using the inspect module you'd find it.)

> I am not opposed to adding a little well-considered protection to some
> attributes where mistakes are prone to happen and/or dangerous, but it
> is futile to try to stop access entirely. ?There's just too many back
> doors.

Sure, but I like the fact that there is no "shadow" attribute, so just
"w" not "w" _and_ "_A__w".

> I would suggest that there really isn't much point in anything more
> complex than your first solution, which was to validate with
> properties and to store the value in a separate attribute.
> Respectable programmers won't lightly bypass your validation if they
> see that you've taken steps to enforce it. ?OTOH, once a programmer,
> respectable or not, decides to override your protection, they are not
> likely to be stopped by something more complex. ?So there is no point
> in making it more complex.
>
> Carl Banks

I think that's a fair viewpoint, but I still like the idea of there
being no _A__w available for property w.

--
Mark Summerfield, Qtrac Ltd, www.qtrac.eu
    C++, Python, Qt, PyQt - training and consultancy
        "Programming in Python 3" - ISBN 0137129297


From andrew at acooke.org  Fri May  8 08:49:07 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 8 May 2009 08:49:07 -0400 (CLT)
Subject: SQL and CSV
In-Reply-To: <gu141o$iek$4@lust.ihug.co.nz>
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
	<gu0ofm$oj9$00$1@news.t-online.com> <gu141o$iek$4@lust.ihug.co.nz>
Message-ID: <0631a4e5e48a064640dadd6e05f783cd.squirrel@acooke.dyndns.org>

Lawrence D'Oliveiro wrote:
> In message <gu0ofm$oj9$00$1 at news.t-online.com>, Peter Otten wrote:
>
>> While it may not matter here using placeholders instead of manually
>> escaping user-provided values is a good habit to get into.
>
> Until you hit things it can't deal with.

The post you are replying to was talking about using the SQL library's "?"
syntax that automatically escapes values.  The usual reason this is
recommended (if I have understood correctly) is that the library code is
much more likely to foil injection attacks.  I have seen this mentioned
often and assume it is good advice.

Can you expand on your comment?  I assume you are thinking of how the
library might handle some strange class.  But aren't the number of types
limited by SQL?  In which case a "thing that can't be handled" could
presumably be managed by adding an appropriate __str__ or __float__ or
whatever?  And you would still use the library to give safety with other
values.

Maybe you could give an example of the kind of problem you're thinking of?

Thanks,
Andrew





From list at qtrac.plus.com  Fri May  8 08:51:24 2009
From: list at qtrac.plus.com (Mark Summerfield)
Date: Fri, 8 May 2009 05:51:24 -0700 (PDT)
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
	<gu0mdh$v8v$02$1@news.t-online.com>
Message-ID: <423ca62c-094d-42ca-9257-cf36b5d38e1d@p4g2000vba.googlegroups.com>

[snip]
> By the way, your Attribute descriptor stores the value for all instances of
> A in the same variable...
>
> Peter

You're right.


From chambon.pascal at wanadoo.fr  Fri May  8 08:51:48 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Fri, 08 May 2009 14:51:48 +0200
Subject: Which one is best Python or Java for developing GUI applications?
Message-ID: <4A042AE4.5030601@wanadoo.fr>




On Thu, May 7, 2009 at 1:42 PM, Pascal Chambon 
<chambon.pascal at wanadoo.fr <mailto:chambon.pascal at wanadoo.fr>> wrote:

    Hello

    When a lot of code using wxwidgets is in place, it's sure that
    moving to qt is a big task ; even though, thanks to qt's GUI
    designer, it's possible to quickly reproduce the structure of the
    wxwidget application with QT widgets.

    If you want to see the power of Qt, I highly advice you to browse
    the very nice "demos" included in both the Qt and PyQt packages -
    those are Gui applications that let you watch all kind of abilities
    very fastly.
    Also, something that wxwidgets will surely never be able to do :
    http://labs.trolltech.com/blogs/2008/12/02/widgets-enter-the-third-dimension-wolfenqt/

    The 2 products (and the Gui designer, docs and demos) can be
    downloaded from these pages :
    http://www.qtsoftware.com/products/
    http://www.riverbankcomputing.co.uk/software/pyqt/download

    And if you have some time for reading :
    http://www.qtsoftware.com/files/pdf/qt-4.4-whitepaper
    http://doc.trolltech.com/4.5/index.html

    Good time with all that,
    regards,
    Pascal



    Qijing Li a ?crit :
>     Thank you for sharing this information.
>
>     I started to use wxPython two years ago,  which fit my needy very
>     well because
>     the jobs I worked on didn't focus on GUI. But now , the project I
>     am working on
>     involves much drawing shapes and looking, most of wxPython works
>     for me,
>     but one thing, as you mentioned, transparency drove me nuts.
>
>      wxPython suppose transparent window, but not transparent
>     background that is right what I need. I did research a lot and was
>     trying to find a proper way to get it, it turns out that I found
>     two tricky way, one is to use wx.EVT_ERASE_BACKGROUND tricky, the
>     other is to copy the image of background under the window as the
>     background image. Although the problem is solved, I feel
>     uncomfortable  about this.
>     I hope wxPython supports  real transparency some day.
>
>     Recently, I have no plan to transmit to other frameworks, such as
>     PyQt.
>     I'm really interested in what is differences between them,  I'll
>     check it.
>     Is there demo of PyQt ? or could you give me some links if they
>     are in the bag.
>
>     Have a good day!
>     Miles
>
>
>
>
>
>
>
>     On Tue, May 5, 2009 at 11:42 AM, Pascal Chambon
>     <chambon.pascal at wanadoo.fr <mailto:chambon.pascal at wanadoo.fr>> wrote:
>
>
>         The fact that Python is a dynamic language offers, in my
>         opinion, a huge advantage to quickly setup a GUI, without
>         caring about the infinite details of the variable types and
>         function signatures.
>         Its good handling of "function as first-class objects" is also
>         precious when comes the time of setting callbacks (I can't
>         bear anymore the way Swing does it, with interfaces etc.)
>
>         But much depends on the framework used, too. I've used
>         wxPython for a multimedia project, and actually it lacked a
>         lot of necessary features (transparency, event loop tuning,
>         multithreading support...), but that was 1 year ago, maybe
>         things have changed.
>         Anyway, I'd advocate the use of PyQt, which really offers
>         tremendous possibilities - if your application isn't a simple
>         office application, its' really worth turning towards pyqt.
>
>         Regards,
>         Pascal
>
>
>
>         Leon a ?crit :
>>         I think there are two advantages over java for GUI application
>>
>>         First, python is more productive and has very rich third modules
>>         support,
>>         you can check the demo of wxPython.
>>
>>         Second, you can develop native-looking GUI
>>
>>         BTW: I'm developing GUI application using python and wxPython.
>>
>>
>>
>>         Second,
>>         On May 4, 11:41 pm, srinivasan srinivas <sri_anna... at yahoo.co.in> <mailto:sri_anna... at yahoo.co.in>
>>         wrote:
>>           
>>>         Could you tell me does Python have any advantages over Java for the development of GUI applications?
>>>
>>>         Thanks,
>>>         Srini
>>>
>>>               Now surf faster and smarter ! Check out the new Firefox 3 - Yahoo! Editionhttp://downloads.yahoo.com/in/firefox/?fr=om_email_firefox <http://downloads.yahoo.com/in/firefox/?fr=om_email_firefox>
>>>             
>>         --
>>         http://mail.python.org/mailman/listinfo/python-list
>>
>>
>>           
>
>


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From __peter__ at web.de  Fri May  8 08:56:53 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 08 May 2009 14:56:53 +0200
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
	<gu0mdh$v8v$02$1@news.t-online.com>
	<5a532192-3e70-48d4-99b8-c8c75c3ef7cb@t10g2000vbg.googlegroups.com>
Message-ID: <gu1a6k$9uj$01$1@news.t-online.com>

Mark Summerfield wrote:

> On 8 May, 08:19, Peter Otten <__pete... at web.de> wrote:
>> MarkSummerfieldwrote:
>> > I had a quick search & didn't find anything _nice_ that produced
>> > attributes with really private data, so I came up with a possible
>> > solution---for Python 3.
>>
>> Do really you think what you suggest below is "nice"?
> 
> Well the code isn't ugly and doesn't mess with the call stack etc.
> 
>> By the way, your Attribute descriptor stores the value for all instances
>> of A in the same variable...
> 
> It seems like it does, but it doesn't. The hidden_value is an instance
> variable that is created every time an Attribute object is created.
> 
>>>> from Attribute import *
>>>> class A:
> a = Attribute("a", 5, lambda *a: True)
> b = Attribute("b", 5, lambda *a: True)
>>>> class B:
> a = Attribute("a", 5, lambda *a: True)
> b = Attribute("b", 5, lambda *a: True)
>>>> a = A()
>>>> b = B()
>>>> a.a,a.b,b.a,b.b
> (5, 5, 5, 5)
>>>> a.a=1;a.b=2;b.a=3;b.b=4
>>>> a.a,a.b,b.a,b.b
> (1, 2, 3, 4)

But attribute values are shared between all instances of the same class:

>>> class A:
...     x = Attribute("x", 42, lambda *a: True)
...
>>> a = A()
>>> b = A()
>>> a.x, b.x
(42, 42)
>>> a.x = "yadda"
>>> a.x, b.x
('yadda', 'yadda')

Peter



From pruebauno at latinmail.com  Fri May  8 09:06:43 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Fri, 8 May 2009 06:06:43 -0700 (PDT)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org> 
	<b698a5bf-d43c-412a-a5ee-3753ca31122b@z5g2000vba.googlegroups.com> 
	<mailman.5251.1241735650.11746.python-list@python.org>
Message-ID: <8f1780d2-96c5-4292-b4eb-64449000d9b3@t11g2000vbc.googlegroups.com>

On May 7, 6:33?pm, Benjamin Peterson <benja... at python.org> wrote:
> ?<pruebauno <at> latinmail.com> writes:
>
> > Congratulations!
>
> Thanks!
>
>
>
> > Is it just me or was some nice summary output added to the make
> > process? I get a nice list of modules that didn't compile and the ones
> > where the library could not be found.
>
> Are you compiling on a different platform? The nice output has been around for a
> while, bu only on non-Windows platforms.

Not really, I was on AIX. It is probably just me then, probably
because for the first time I see it making it through the whole
process even with the Tkinter libraries missing.


From list at qtrac.plus.com  Fri May  8 09:17:28 2009
From: list at qtrac.plus.com (Mark Summerfield)
Date: Fri, 8 May 2009 06:17:28 -0700 (PDT)
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
	<gu0mdh$v8v$02$1@news.t-online.com>
	<5a532192-3e70-48d4-99b8-c8c75c3ef7cb@t10g2000vbg.googlegroups.com>
	<gu1a6k$9uj$01$1@news.t-online.com>
Message-ID: <0096da6a-38a4-405a-894e-046ec69f1d50@b1g2000vbc.googlegroups.com>

On 8 May, 13:56, Peter Otten <__pete... at web.de> wrote:
> MarkSummerfieldwrote:
> > On 8 May, 08:19, Peter Otten <__pete... at web.de> wrote:
> >> MarkSummerfieldwrote:
> >> > I had a quick search & didn't find anything _nice_ that produced
> >> > attributes with really private data, so I came up with a possible
> >> > solution---for Python 3.
>
> >> Do really you think what you suggest below is "nice"?
>
> > Well the code isn't ugly and doesn't mess with the call stack etc.
>
> >> By the way, your Attribute descriptor stores the value for all instances
> >> of A in the same variable...
>
> > It seems like it does, but it doesn't. The hidden_value is an instance
> > variable that is created every time an Attribute object is created.
>
> >>>> from Attribute import *
> >>>> class A:
> > a = Attribute("a", 5, lambda *a: True)
> > b = Attribute("b", 5, lambda *a: True)
> >>>> class B:
> > a = Attribute("a", 5, lambda *a: True)
> > b = Attribute("b", 5, lambda *a: True)
> >>>> a = A()
> >>>> b = B()
> >>>> a.a,a.b,b.a,b.b
> > (5, 5, 5, 5)
> >>>> a.a=1;a.b=2;b.a=3;b.b=4
> >>>> a.a,a.b,b.a,b.b
> > (1, 2, 3, 4)
>
> But attribute values are shared between all instances of the same class:
>
> >>> class A:
>
> ... ? ? x = Attribute("x", 42, lambda *a: True)
> ...>>> a = A()
> >>> b = A()
> >>> a.x, b.x
> (42, 42)
> >>> a.x = "yadda"
> >>> a.x, b.x
>
> ('yadda', 'yadda')
>
> Peter

Yes. I did think of trying to create the closures dynamically the
first time the getter or setter was called---but that _is_ getting
ugly, so I'll give it up:-)

Thanks!

--
Mark Summerfield, Qtrac Ltd, www.qtrac.eu
    C++, Python, Qt, PyQt - training and consultancy
        "Programming in Python 3" - ISBN 0137129297


From pruebauno at latinmail.com  Fri May  8 09:20:37 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Fri, 8 May 2009 06:20:37 -0700 (PDT)
Subject: Python 2.6, File read() problems in Windows Xp
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com> 
	<4A03DE84.40406@ieee.org>
	<mailman.5278.1241773688.11746.python-list@python.org>
Message-ID: <cc2e86ca-29b2-464b-8f89-1a823098a2c1@h23g2000vbc.googlegroups.com>

On May 8, 5:08?am, Li Wang <li.wan... at gmail.com> wrote:
> Hi ?Dave:
> Thank you very much for you explanation:)
>
> > Chances are you forgot the "b" parameter to open(). ?Unnecessary in Unix, it
> > tells the library to *not* translate \r\n ?to \n upon read, or the inverse
> > on write. ?In other words, with the "b" parameter, the file is read in
> > unchanged.
>
> So, if I am using python in Linux, do open('file', 'r') and
> open('file', 'rb') work the same way?
>
> Thanks,
>
> Best regards,
> Li

In old Python up to 2.6, YES.


From p.f.moore at gmail.com  Fri May  8 09:21:30 2009
From: p.f.moore at gmail.com (Paul Moore)
Date: Fri, 8 May 2009 06:21:30 -0700 (PDT)
Subject: Tutorial or example use for python-graph library
Message-ID: <030fcef4-2bf5-4194-97f2-78ce95ca4ef5@v17g2000vbb.googlegroups.com>

I have just discovered the python-graph library. I've been interested
in graph algorithms for a long time, so I'd like to give this a try.
But there seems to be very little in the way of examples, or tutorial
documentation available. There's the API documentation, but that's not
really narrative form. And there are some examples in the
distribution, but these seem to be essentially artificial examples,
rather than real-world code (and they don't have much in the way of
documentation!)

Are there any reasonably-sized tutorials, or examples of common real-
world code, using this package? My google-fu wasn't strong enough to
find anything directly :-(

Thanks,
Paul


From Scott.Daniels at Acm.Org  Fri May  8 09:32:56 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 06:32:56 -0700
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <mailman.5278.1241773688.11746.python-list@python.org>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>	<4A03DE84.40406@ieee.org>
	<mailman.5278.1241773688.11746.python-list@python.org>
Message-ID: <8YudnbqqeKjLrpnXnZ2dnUVZ_hidnZ2d@pdx.net>

Li Wang wrote:
> So, if I am using python in Linux, do open('file', 'r') and
> open('file', 'rb') work the same way?

You get identical results, but you ar lying to the reader of your code.
you should include the 'b' if what you want is bytes (or octets if you
prefer), and not use it if what you expect is "text."   Your code
becomes less confusing by using 'b' properly, even if you see no
particular difference.

--Scott David Daniels
Scott.Daniels at Acm.Org


From li.wang.d at gmail.com  Fri May  8 09:47:23 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 8 May 2009 23:47:23 +1000
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <8YudnbqqeKjLrpnXnZ2dnUVZ_hidnZ2d@pdx.net>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
	<4A03DE84.40406@ieee.org>
	<mailman.5278.1241773688.11746.python-list@python.org>
	<8YudnbqqeKjLrpnXnZ2dnUVZ_hidnZ2d@pdx.net>
Message-ID: <11aabe3b0905080647h12c5553bt7f96515ecec79ddf@mail.gmail.com>

2009/5/8 Scott David Daniels <Scott.Daniels at acm.org>:
> Li Wang wrote:
>>
>> So, if I am using python in Linux, do open('file', 'r') and
>> open('file', 'rb') work the same way?
>
> You get identical results, but you ar lying to the reader of your code.
> you should include the 'b' if what you want is bytes (or octets if you
> prefer), and not use it if what you expect is "text."   Your code
> becomes less confusing by using 'b' properly, even if you see no
> particular difference.
>
Thanks a lot, very helpful:D
>



-- 
Li
------
Time is all we have
and you may find one day
you have less than you think


From li.wang.d at gmail.com  Fri May  8 09:47:51 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 8 May 2009 23:47:51 +1000
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <cc2e86ca-29b2-464b-8f89-1a823098a2c1@h23g2000vbc.googlegroups.com>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
	<4A03DE84.40406@ieee.org>
	<mailman.5278.1241773688.11746.python-list@python.org>
	<cc2e86ca-29b2-464b-8f89-1a823098a2c1@h23g2000vbc.googlegroups.com>
Message-ID: <11aabe3b0905080647s64bcea1ao521f312f9609c502@mail.gmail.com>

2009/5/8  <pruebauno at latinmail.com>:
> On May 8, 5:08 am, Li Wang <li.wan... at gmail.com> wrote:
>> Hi  Dave:
>> Thank you very much for you explanation:)
>>
>> > Chances are you forgot the "b" parameter to open().  Unnecessary in Unix, it
>> > tells the library to *not* translate \r\n  to \n upon read, or the inverse
>> > on write.  In other words, with the "b" parameter, the file is read in
>> > unchanged.
>>
>> So, if I am using python in Linux, do open('file', 'r') and
>> open('file', 'rb') work the same way?
>>
>> Thanks,
>>
>> Best regards,
>> Li
>
> In old Python up to 2.6, YES.
Thank you:D



-- 
Li
------
Time is all we have
and you may find one day
you have less than you think


From emreguney at gmail.com  Fri May  8 10:19:45 2009
From: emreguney at gmail.com (e.g. emre)
Date: Fri, 8 May 2009 07:19:45 -0700 (PDT)
Subject: Tutorial or example use for python-graph library
References: <030fcef4-2bf5-4194-97f2-78ce95ca4ef5@v17g2000vbb.googlegroups.com>
Message-ID: <8f032f4b-ae7a-45a0-baeb-82005229be22@n4g2000vba.googlegroups.com>

On May 8, 3:21?pm, Paul  Moore <p.f.mo... at gmail.com> wrote:
> I have just discovered the python-graph library. I've been interested
> in graph algorithms for a long time, so I'd like to give this a try.
> But there seems to be very little in the way of examples, or tutorial
> documentation available. There's the API documentation, but that's not
> really narrative form. And there are some examples in the
> distribution, but these seem to be essentially artificial examples,
> rather than real-world code (and they don't have much in the way of
> documentation!)
>
> Are there any reasonably-sized tutorials, or examples of common real-
> world code, using this package? My google-fu wasn't strong enough to
> find anything directly :-(
>
> Thanks,
> Paul

Hi,
you might want to check networkx as well, it is considerably well
documented:
http://networkx.lanl.gov/
Emre


From james at agentultra.com  Fri May  8 10:21:12 2009
From: james at agentultra.com (J Kenneth King)
Date: Fri, 08 May 2009 10:21:12 -0400
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5109.1241543371.11746.python-list@python.org>
	<85d4am8hq4.fsf@agentultra.com>
	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
	<8563gcx1p1.fsf@agentultra.com>
	<mailman.5242.1241727015.11746.python-list@python.org>
Message-ID: <854ovv7k13.fsf@agentultra.com>

Terry Reedy <tjreedy at udel.edu> writes:

> J Kenneth King wrote:
>>
>> Keep in mind that nested comprehensions are still available because
>> they do have a use case that justifies their existence.
>
> Nested comprehensions are available because because the syntax makes
> them available by default and making a fiddly exception would be
> contrary to Python's style.  A list comp creates an iterable. A list
> comp requires use of an iterable.  Therefore, a list comp may use a
> list comp.
>
>> However, I
>> think the Python documentation warns against their use because people
>> might rely on them for problems where they aren't necessary and since
>> they are difficult to read... it can lead to difficult to read code.
>
> Whenever the expression that results in the iterable used by a list
> comp is sufficiently complex, readability is improved by pulling it
> out as a separate statement. Nested list comps are often examplex of
> such sufficiently complex expressions, but not the only possible one.
>
> tjr

Agreed. A very succinct explanation of the point I was trying to make.


From nickle at gmail.com  Fri May  8 10:22:02 2009
From: nickle at gmail.com (Nick)
Date: Fri, 8 May 2009 07:22:02 -0700 (PDT)
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
	<gu0ofm$oj9$00$1@news.t-online.com> <gu141o$iek$4@lust.ihug.co.nz> 
	<mailman.5285.1241786958.11746.python-list@python.org>
Message-ID: <b7c68e74-21ae-4133-a058-e3c669f0faf6@o20g2000vbh.googlegroups.com>

On May 8, 1:49?pm, "andrew cooke" <and... at acooke.org> wrote:
> Lawrence D'Oliveiro wrote:
> > In message <gu0ofm$oj9$0... at news.t-online.com>, Peter Otten wrote:
>
> >> While it may not matter here using placeholders instead of manually
> >> escaping user-provided values is a good habit to get into.
>
> > Until you hit things it can't deal with.
>
> The post you are replying to was talking about using the SQL library's "?"
> syntax that automatically escapes values. ?The usual reason this is
> recommended (if I have understood correctly) is that the library code is
> much more likely to foil injection attacks. ?I have seen this mentioned
> often and assume it is good advice.
>
> Can you expand on your comment? ?I assume you are thinking of how the
> library might handle some strange class. ?But aren't the number of types
> limited by SQL? ?In which case a "thing that can't be handled" could
> presumably be managed by adding an appropriate __str__ or __float__ or
> whatever? ?And you would still use the library to give safety with other
> values.
>
> Maybe you could give an example of the kind of problem you're thinking of?
>
> Thanks,
> Andrew

Injection attacks aren't an issue, its a local app.

It's part of a reconciliation system, where sometimes data is in csv
files. If you want the whole csv file, you can use csv module without
a problem.

In some cases, I need to manipulate the data.

The choices are hard code the manipulation, or load the data from a
config file.

So what I've got is the query in the config and I can process it.

Nick


From Scott.Daniels at Acm.Org  Fri May  8 10:31:12 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 07:31:12 -0700
Subject: Compiling snippets of python code
In-Reply-To: <RNOdnWjWTNq2jZnXnZ2dnUVZ8g6dnZ2d@bt.com>
References: <RNOdnWjWTNq2jZnXnZ2dnUVZ8g6dnZ2d@bt.com>
Message-ID: <3pmdnQdqr4ic3JnXnZ2dnUVZ_jWdnZ2d@pdx.net>

Basil Brush wrote:
> I need some advice on compiling snippets of python source at runtime. So
> perhaps some python experts can point the way.
> 
> I am rewriting an old Java app in python. It tries to find solutions to
> computational problems based on the idea of genetic evolution. The Java
> version just used an array of bytes for the genomes. These byte
> sequences were bytecode which told a rudimentary VM (virtual machine)
> which maths functions to call. It used another array as a small chunk of
> virtual memory for doing the calculations.

Unlike Java and C++, functions and methods are first class.  You can
make lists and dictionaries containing functions, and that would be
the normal Python way of handling this, rather than generating source
from snippets.  You should take a look at Numpy if the "maths functions"
are operating on large chunks of data (fft, matrix operations, and the
like).  If the operations are smallish things, pure Python is likely the
way to go.  I don't understand what the "other array as a small chunk of
virtual memory" might be; my first take is YAGNI.

> Having seen the docs on python's compile module, I'm thinking of doing
> it differently in the new python version. My aim is to have the genomes
> made up of a sequence of python source snippets, with each snippet to be
> randomly generated, compiled, and executed at runtime. The advantage of
> this is that it gives me greater flexibility and I can change what
> actions the genomes can do without having to add new functions to my VM.
> 
> But there's some crucial points. When the snippet is executed I would
> need to pass in a list or array, and I need the list back again with any
> changes that were made; this is the virtual memory and how I would get
> the results back, and is also how the snippet would get data from a
> previous snippet in a sequence. 


Here is a toy-like version of what you might want to do:
     # Some operations:
     def double(vec):
         return [x * 2 for x in vec]

     def alternate(vec):
         '''An "unshuffling" step'''
         return vec[::2] + vec[1::2]

     def halve(vec):
         return [x / 2 for x in vec]

     # Some execution lists:
     processing = [double, alternate, halve, alternate]
     new_processing = alternate(processing) # you can shuffle any list

     assert new_processing == [double, halve, alternate, alternate]

     def perform(processes, data):
         for step in processes:
             data = step(data)
         return data

     start = [x * x for x in range(10)]
     assert perform(processing, start) == perform(new_processing, start)
     print start
     mid = perform(processing, start)
     print mid
     print perform(processing, mid)
     print perform(processing * 2, start)

prints:
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
[0, 16, 64, 9, 49, 4, 36, 1, 25, 81]
[0, 49, 25, 9, 1, 64, 36, 16, 4, 81]
[0, 49, 25, 9, 1, 64, 36, 16, 4, 81]


How would I do this? Also, there is a
> database of input data. Rather than pass all that data to the snippet
> I'd rather have functions in my module which the snippet could call to
> get data. So what's the scope of an executing piece of code? Can it
> access my modules and functions?
First, let go of managing the data allocation.  Second, realize passing
a list or array is simple and cheap, and _not_ proportional to the size
of the list or array.  You are passing the actual object.  You really
need to run through the tutorial; these questions will be answered there.
Sit down with the tutorial and the interpretter, executing anything you
don't quite understand.  I did it in IDLE, but you may prefer straight
command line.

> My linux system has python 2.5 and I noticed that the docs say the
> compile module has been removed from python 3.0. So I'm concerned about
> whether my app would work in 3.0 if I upgraded. Does anyone know if they
> moved the compiler to another module or simply removed it entirely?
Although I don't think you should be working with the compiler, if
you want to use something like that, you'd be better advised to use
the "ast" module first added in 2.6.  But for now, don't borrow trouble
you don't need. Rethink your problem and write it in Python.  Don't try
to do a line-by-line translation, you'll just have a slow awkward Python
program with a Java heart.

--Scott David Daniels
Scott.Daniels at Acm.Org


From apt.shansen at gmail.com  Fri May  8 10:36:52 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 8 May 2009 07:36:52 -0700
Subject: Creating temperory files for a web application
In-Reply-To: <354db318-25b3-4af1-8fb1-cd86a0695637@x31g2000prc.googlegroups.com>
References: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>
	<76ideeF1d1gbsU1@mid.uni-berlin.de>
	<354db318-25b3-4af1-8fb1-cd86a0695637@x31g2000prc.googlegroups.com>
Message-ID: <7a9c25c20905080736t5124faedue1a2dde40a41e28f@mail.gmail.com>

>
>
> Thank you Diez.
> I would like to go ahead with the cleanest solution indeed.
> I am creating the image on the fly. But I could not understand what
> you meant by render to memory as a string.
> How do we send the image to the browser?
>
> Were you mentioning about having the image as a string and then
> passing to the browser based on data URL scheme <RFC 2397> ?
> Or is it something else like XBM format or something? I am sorry - but
> I am quite unsure of what you meant?
>
> I am actually creating PDFs, CSVs and images on the fly. So, I need to
> delete them all after that.
> The images can be somewhat large - ~2MB. The RFC mentions that large
> data cannot be sent that way.
>

The question is, how are you generating these images? What you consider a
"file" and what a web server considers a "file" is really meaningless
actually. To a web browser, all a "file" is is a stream of content with a
certain content-type which it uses to determine how to treat it. This isn't
about the RFC2397. The web browser has no idea if the content its fetching
is from a file or a database or generated on the fly-- its all the same
thing. There's a URL which returns data, when requested. That data might be
a HTML file (as determined by its Content-type), in which case the browser
renders it. Or it might be a JPG, in which case it displays it. Or it might
be a zip file in which case it probably asks you where you want to save it.

Depending on how exactly you're actually "generating" the image, its quite
possible you don't need to use a real file at all. You can use a file-like
object, such as (c)StringIO and pass it to your image generation routines
which will generate the entire image in memory. You can write to this
file-like object as if it were a real file on the disk somewhere, seek,
scan, pass it to most libraries that need file objects.... and then when
done, you can return its contents... all without a -real- file on disk ever
being touched.

Like so vaguely:
    f = cStringIO.StringIO()
    my_library_which_makes_images(f)
    f.seek(0)
    return f.read()

Exactly how you indicate what the Content-type will be and do that will
depend on what web framework you're using.

For example, on one app I have -- I'm using TurboGears -- I do something
like this:

    @expose(format="image/jpeg", content_type="image/jpeg")
    def getJPEG(self, element_number):
        element = self._resourceManager.getElement(element_number)
        if element:
            return element.data

        return ''

Now the specifics of what's going on aren't important. But I'm connecting to
a remote system, and getting an object which contains the entire contents of
a JPEG in a single string. So the entire file is in memory. I could then
tweak or manipulate it with PIL to change that file all without any
filesystem access, working entirely on file-like objects in memory, then
return the contents.

--S
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From Shawn at Milochik.com  Fri May  8 10:43:08 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Fri, 8 May 2009 10:43:08 -0400
Subject: OT (humor): 'import antigravity' in action!
Message-ID: <2dc0c81b0905080743o334a04efg9e029f346b5b0795@mail.gmail.com>

I know you've probably all seen this 50 times, but just in case:
http://xkcd.com/353/

And here's the result:
http://icanhascheezburger.com/2009/05/06/funny-pictures-behavior-20/


From list at qtrac.plus.com  Fri May  8 10:48:59 2009
From: list at qtrac.plus.com (Mark Summerfield)
Date: Fri, 8 May 2009 07:48:59 -0700 (PDT)
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
	<gu0mdh$v8v$02$1@news.t-online.com>
	<5a532192-3e70-48d4-99b8-c8c75c3ef7cb@t10g2000vbg.googlegroups.com>
	<gu1a6k$9uj$01$1@news.t-online.com>
Message-ID: <ff697108-a739-411d-9c2a-d33ae680dd16@o27g2000vbd.googlegroups.com>

On 8 May, 13:56, Peter Otten <__pete... at web.de> wrote:
> Mark Summerfield wrote:
> > On 8 May, 08:19, Peter Otten <__pete... at web.de> wrote:
> >> MarkSummerfieldwrote:
> >> > I had a quick search & didn't find anything _nice_ that produced
> >> > attributes with really private data, so I came up with a possible
> >> > solution---for Python 3.
>
> >> Do really you think what you suggest below is "nice"?
>
> > Well the code isn't ugly and doesn't mess with the call stack etc.
>
> >> By the way, your Attribute descriptor stores the value for all instances
> >> of A in the same variable...
>
> > It seems like it does, but it doesn't. The hidden_value is an instance
> > variable that is created every time an Attribute object is created.
>
> >>>> from Attribute import *
> >>>> class A:
> > a = Attribute("a", 5, lambda *a: True)
> > b = Attribute("b", 5, lambda *a: True)
> >>>> class B:
> > a = Attribute("a", 5, lambda *a: True)
> > b = Attribute("b", 5, lambda *a: True)
> >>>> a = A()
> >>>> b = B()
> >>>> a.a,a.b,b.a,b.b
> > (5, 5, 5, 5)
> >>>> a.a=1;a.b=2;b.a=3;b.b=4
> >>>> a.a,a.b,b.a,b.b
> > (1, 2, 3, 4)
>
> But attribute values are shared between all instances of the same class:
>
> >>> class A:
>
> ... ? ? x = Attribute("x", 42, lambda *a: True)
> ...>>> a = A()
> >>> b = A()
> >>> a.x, b.x
> (42, 42)
> >>> a.x = "yadda"
> >>> a.x, b.x
>
> ('yadda', 'yadda')
>
> Peter

OK, I couldn't quite give it up. But the solution isn't nice or good.
It does work, but at the cost of an extra dictionary lookup on every
get or set, plus a dictionary to hold all the getters & setters. I
_don't recommend it_, but here it is anyway. I've done with it now:-)

class Attribute:

    __accessors = {}

    def __init__(self, name, first_value=None, validator=None):
        self.name = name
        self.first_value = first_value
        self.validator = validator

    def __get__(self, instance, owner=None):
        if instance is None:
            return self
        if (id(instance), self.name) not in self.__accessors:
            self.__makeAccessors(instance)
        return self.__accessors[id(instance), self.name][0](instance)


    def __set__(self, instance, value):
        if (id(instance), self.name) not in self.__accessors:
            self.__makeAccessors(instance)
        setter = self.__accessors[id(instance), self.name][1]
        if setter is None:
            raise AttributeError("'{0}' is read-only".format(
                                 self.__name__))
        return setter(instance, value)


    def __makeAccessors(self, instance):
        hidden_value = self.first_value
        getter = lambda self: hidden_value
        if self.validator is not None:
            def set(instance, value):
                if self.validator(instance, value):
                    nonlocal hidden_value
                    hidden_value = value
                else:
                    raise ValueError("'{0}' is not valid for {1}"
                                     .format(value, name))
            setter = set
        else:
            setter = None
        self.__accessors[id(instance), self.name] = (getter, setter)

--
Mark Summerfield, Qtrac Ltd, www.qtrac.eu
    C++, Python, Qt, PyQt - training and consultancy
        "Programming in Python 3" - ISBN 0137129297


From Kevin.Smith at sas.com  Fri May  8 10:49:23 2009
From: Kevin.Smith at sas.com (Kevin D. Smith)
Date: Fri, 8 May 2009 09:49:23 -0500
Subject: heapq.merge with key=
References: <gtvjgk$tm8$1@foggy.unx.sas.com>
	<mailman.5264.1241758129.11746.python-list@python.org>
Message-ID: <gu1gpj$nue$1@foggy.unx.sas.com>

On 2009-05-07 23:48:43 -0500, Chris Rebert <clp2 at rebertia.com> said:

> On Thu, May 7, 2009 at 2:23 PM, Kevin D. Smith <Kevin.Smith at sas.com> wrote:
>> I need the behavior of heapq.merge to merge a bunch of results from a
>> database. ?I was doing this with sorted(itertools.chain(...), key=
> ...), but
>> I would prefer to do this with generators. ?My issue is that I need
> the key
>> argument to sort on the correct field in the database. ?heapq.merge
> doesn't
>> have this argument and I don't understand the code enough to know if it's
>> possible to add it. ?Is this enhancement possible without drasticall
> y
>> changing the current code?
> 
> I think so. Completely untested code:
> 
> def key(ob):
>     #code here
> 
> class Keyed(object):
>     def __init__(self, obj):
>         self.obj = obj
>     def __cmp__(self, other):
>         return cmp(key(self.obj), key(other.obj))
> 
> def keyify(gen):
>     for item in gen:
>         yield Keyed(item)
> 
> def stripify(gen):
>     for keyed in gen:
>         yield keyed.obj
> 
> merged = stripify(merge(keyify(A), keyify(B), keyify(C))) #A,B,C being
> the iterables

Ah, that's not a bad idea.  I think it could be simplified by letting 
Python do the comparison work as follows (also untested).

def keyify(gen, key=lamda x:x):
    for item in gen:
        yield (key(item), item)

def stripify(gen):
    for item in gen:
        yield item[1]

After looking at the heapq.merge code, it seems like something like 
this could easily be added to that code.  If the next() calls were 
wrapped with the tuple creating code above and the yield simply 
returned the item.  It would, of course, have to assume that the 
iterables were sorted using the same key, but that's better than not 
having the key option at all.

-- 
Kevin D. Smith



From anuraguniyal at yahoo.com  Fri May  8 10:53:44 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 8 May 2009 07:53:44 -0700 (PDT)
Subject: unicode bit me
Message-ID: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>

#how can I print a list of object which may return unicode
representation?
# -*- coding: utf-8 -*-

class A(object):

    def __unicode__(self):
        return u"?au"

    __str__ = __repr__ = __unicode__

a = A()

try:
    print a # doesn't work?
except UnicodeEncodeError,e:
    print e
try:
    print unicode(a) # works, ok fine, great
except UnicodeEncodeError,e:
    print e
try:
    print unicode([a]) # what!!!! doesn't work?
except UnicodeEncodeError,e:
    print e
"""
Now how can I print a list of object which may return unicode
representation?
loop/map is not an option as it goes much deepr in my real code
any can anyoen explain what is happening here under the hood?
"""


From gnewsg at gmail.com  Fri May  8 10:57:07 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Fri, 8 May 2009 07:57:07 -0700 (PDT)
Subject: Call a function when a thread exits
References: <5664df89-2966-45e4-a959-f4fc85c2e50f@g20g2000vba.googlegroups.com>
	<eb595814-19c9-44f1-a1de-9c313b0adc18@s31g2000vbp.googlegroups.com>
Message-ID: <13b3dc70-fcc6-48c1-927c-f9f79b6914ae@b1g2000vbc.googlegroups.com>

On 8 Mag, 03:33, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 7, 6:12?pm, "Giampaolo Rodola'" <gne... at gmail.com> wrote:
>
>
>
>
>
> > Hi,
> > I'm searching for a smooth way to call a certain function when a
> > thread has finished its job.
> > I guess I can keep calling isAlive() in a loop and call my function
> > when it returns False but it's not very elegant.
> > Actually I'm a bit surprised it doesn't exists an "atexit" function.
> > Something like:
>
> > import threading, time
>
> > def myfun():
> > ? ? time.sleep(1)
> > ? ? print "hello"
>
> > def cleanup():
> > ? ? print "thread finished, starting cleanup operations..."
>
> > t = threading.Thread(target=myfun)
> > t.atexit(target=cleanup)
> > t.start()
>
> > Is there a reason why there's no such thing in the threading module?
>
> You can define your target function to clean up on exit. ?Using your
> definitions of myfun and cleanup,
>
> def mycleanfun():
> ? ? try:
> ? ? ? ? myfun()
> ? ? finally:
> ? ? ? ? cleanup()
>
> t = threading.Thread(target=mycleanfun)
> t.start()
>
> Carl Banks

Yes, I know. I was wondering if it could be a good idea proposing
something like an atexit() function to be included in threading
module.


--- Giampaolo
http://code.google.com/p/pyftpdlib
http://code.google.com/p/psutil


From Scott.Daniels at Acm.Org  Fri May  8 11:03:57 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 08:03:57 -0700
Subject: Tutorial or example use for python-graph library
In-Reply-To: <030fcef4-2bf5-4194-97f2-78ce95ca4ef5@v17g2000vbb.googlegroups.com>
References: <030fcef4-2bf5-4194-97f2-78ce95ca4ef5@v17g2000vbb.googlegroups.com>
Message-ID: <BZidnUU6s6Y31ZnXnZ2dnUVZ_ridnZ2d@pdx.net>

Paul Moore wrote:
> I have just discovered the python-graph library. I've been interested
> in graph algorithms for a long time, so I'd like to give this a try.
> But there seems to be very little in the way of examples, or tutorial
> documentation available. There's the API documentation, but that's not
> really narrative form. And there are some examples in the
> distribution, but these seem to be essentially artificial examples,
> rather than real-world code (and they don't have much in the way of
> documentation!)
> 
> Are there any reasonably-sized tutorials, or examples of common real-
> world code, using this package? My google-fu wasn't strong enough to
> find anything directly :-(

Try writing one yourself, as you are learning the interface.  The
package authors will love it, and will probably be overjoyed to
help you as you stumble.

--Scott David Daniels
Scott.Daniels at Acm.Org


From ppearson at nowhere.invalid  Fri May  8 11:08:35 2009
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 8 May 2009 15:08:35 GMT
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
	<fbGMl.6972$hd4.4032@newsfe24.ams2>
	<mailman.5238.1241723354.11746.python-list@python.org>
	<lrGMl.6973$hd4.2539@newsfe24.ams2>
	<mailman.5248.1241732704.11746.python-list@python.org>
	<WLSMl.4$3C7.0@newsfe30.ams2>
Message-ID: <76j07jF17rmbsU1@mid.individual.net>

On Fri, 8 May 2009 10:16:55 +0100, Alan Cameron <alan.cameron at iname.com> wrote:
[snip]
>
> In particular reference to the tutorial section
> http://docs.python.org/3.0/tutorial/datastructures.html#nested-list-comprehensions
>
> There is a word which is ambiguous, at least to me.
>
> Perhaps you can explain the use of the word 'comprehensions'.
>
> Comprehension I understand
> Comprehensions I don't.
>
> Is there a glossary of terms somewhere?

"Comprehension", in this context, is a computer-science term, described
in section 5.1.3 of the web page you quoted.  If you look up
"comprehension" in Wikipedia, you'll get a description of various
uses of the term, including a pointer to:
http://en.wikipedia.org/wiki/List_comprehension

-- 
To email me, substitute nowhere->spamcop, invalid->net.


From chambon.pascal at gmail.com  Fri May  8 11:19:13 2009
From: chambon.pascal at gmail.com (Pascal Chambon)
Date: Fri, 08 May 2009 17:19:13 +0200
Subject: php to python code converter
Message-ID: <4A044D71.1000500@gmail.com>

Hello

That's funny, I was precisely thinking about a php to python converter, 
some weeks ago.
Such a tool, allowing for example to convert some CMS like Drupal to 
python, would be a killer app, when we consider the amount of php code 
available.

But of course, there are lots of issues that'd have to be fixed :
- translating the php syntax to python syntax
- forcing scope limitations where php doesn't have any
- handling differences in semantics (for example, the booleanness of "0" 
or)
- handling the automatic variable creation and coertion that php features
- handling the php types like arrays (which are neither python lists nor 
python dicts)
- providing a whole mirror of the php stdlib (string and file functions, 
access to environment vars...)

Some things, like PECL modules, would imo be almost impossible to handle 
(there are already so much trouble to make Cpython extensions available 
to other python implementations...), but I guess that 95% of existing 
php websites could be wholly translated "just" with a language 
translator and an incomplete stddlib replacement.

That's hell a lot of work anyway, so it'd be worth weighing it ^^

Actually, your module "phppython" might already be rather useful, 
because I've crossed here and there people desperately asking for help 
when translating some php function of their own to python.

But if the project were to become bigger, I guess some choices would 
have to be rechecked. For example it seems you parse the php code your 
own way, instead of using existing php parsers ; I think the most 
flexible way would be walking some kind of php abstract syntax tree, and 
translating it to python AST on the way. Also, writting the comments in 
english woudl be mandatory :p

I'd like to have the opinion of people around : do you think that 
complete language translators like php<->python or ruby<->python are 
possible ? Impossible ? Not worth the effort ? Or must be reached by 
another way (eg. Parrot and stuffs) ?

Regards,
Pascal

PS : Am I the only one having most of answers rejected by the antispam 
system of python-list ? That's humiliating :p

bvidinli a ?crit :
> if anybody needs:
> http://code.google.com/p/phppython/
> -- 
> http://mail.python.org/mailman/listinfo/python-list
>
>
>   



From walterbyrd at iname.com  Fri May  8 11:22:22 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Fri, 8 May 2009 08:22:22 -0700 (PDT)
Subject: Path difficulties with Python 2.5 running on Cygwin
Message-ID: <856d93a6-4bbe-4513-b2f2-8e0fa304c797@n7g2000prc.googlegroups.com>

It workerd fine yesterday, but it won't work today.

I can still run python, but when I try to import csv, I get an error:

File "/usr/lib/python2.5/csv.py", line 8 in <module>  . . .

The module is there. I am guessing that python can not find it.


From walterbyrd at iname.com  Fri May  8 11:29:59 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Fri, 8 May 2009 08:29:59 -0700 (PDT)
Subject: Path difficulties with Python 2.5 running on Cygwin
References: <856d93a6-4bbe-4513-b2f2-8e0fa304c797@n7g2000prc.googlegroups.com>
Message-ID: <17a04789-b47e-465e-a715-9b512048405d@u39g2000pru.googlegroups.com>

On May 8, 9:22?am, walterbyrd <walterb... at iname.com> wrote:
> It workerd fine yesterday, but it won't work today.
>
> I can still run python, but when I try to import csv, I get an error:
>
> File "/usr/lib/python2.5/csv.py", line 8 in <module> ?. . .
>
> The module is there. I am guessing that python can not find it.

I should have added:

When I am in /cygdrive/c/Documents and Settings, everything works
fine. But, when I am in /cygdrive/c/Documents and Settings/wbyrd, it
no longer works.

I also get the error: Attribute error: module has no attribute
'reader'

I accidently named a script csv.py, put I deleted that. It seems like
I might need to clear out the python interprator, but I don't know how
to do that.




From mikael at isy.liu.se  Fri May  8 11:33:34 2009
From: mikael at isy.liu.se (Mikael Olofsson)
Date: Fri, 08 May 2009 17:33:34 +0200
Subject: Decorating methods - where do my arguments go?
Message-ID: <gu167u$svk$1@news.lysator.liu.se>

Hi all!

I have long tried to avoid decorators, but now I find myself in a 
situation where I think they can help. I seem to be able to decorate 
functions, but I fail miserably when trying to decorate methods. The 
information I have been able to find on-line focuses on decorating 
functions, and do not mention any special problem regarding methods.

Consider the following example. I start by defining a simple decorator:

 >>> class test_decorator(object):
...     def __init__(self,func):
...         self._func = func
...     def __call__(self, *args):
...         print 'Decorator:', args
...         self._func(*args)

Then I decorate a function:

 >>> @test_decorator
... def func(*args):
...     print 'Function: ', args

Let's try that:

 >>> func(1,2,3)
Decorator: (1, 2, 3)
Function:  (1, 2, 3)

OK! That was what I expected. Let's decorate a method:

 >>> class cls(object):
...     @test_decorator
...     def meth(self,*args):
...         print 'Method:   ', args

Then try that:

 >>> cls().meth(1,2,3)
Decorator: (1, 2, 3)
Method:    (2, 3)

Oops! That's weird. I had expected - or at least wanted - the same 
result as for the function above.

Where did the first argument go? If it was sent to the original method 
meth as the real first argument (self), then why did I not get an exception?

More importantly: How do I write a decorator that does not drop arguments?

I guess it all has to do with the fact that the returned callable isn't 
a method of cls. Is it possible to write a decorator that returns a 
callable that is a method of cls, when used on methods in cls?

/MiO


From Ning.Zhang at centrica.com  Fri May  8 11:35:08 2009
From: Ning.Zhang at centrica.com (Zhang, Ning)
Date: Fri, 8 May 2009 16:35:08 +0100
Subject: SOAPpy(10060, 'Operation timed out')
Message-ID: <07BA348A0DE16649800F91416F354B8E8F5B0E@WC000046A.uk.centricaplc.com>

Hi all

I am working for a energy company, we currently want to use api to load
data into the database.

I am new for soappy package. I have done a bit research on 
http://www.ibm.com/developerworks/webse ... #resources
<http://www.ibm.com/developerworks/webservices/library/ws-pyth16/#resour
ces> 
and
http://www.diveintopython.org/soap_web_ ... gging.html
<http://www.diveintopython.org/soap_web_services/debugging.html> 

I can make none of the examples from tutorial correct.  

I have also tried the the example from Endolith posted last year.

viewtopic.php?f=19&t=10038&p=45872&hilit=soap#p45872
<http://www.python-forum.org/pythonforum/viewtopic.php?f=19&t=10038&p=45
872&hilit=soap#p45872> 

Code: Select all
<http://www.python-forum.org/pythonforum/viewtopic.php?f=5&t=12876##>  

from SOAPpy import WSDL

wsdl_file = 'http://xurrency.com/api.wsdl'
server = WSDL.Proxy(wsdl_file)
values = server.getValuesInverse('usd')



However, I got the error message below:  

error: (10060, 'Operation timed out')

Can anyone kind help me with this issue? Alternatively if anyone could
provide any worked examples, i will be much appreciated.  

Kind regards,
Ning Zhang

 


_____________________________________________________________________
The information contained in or attached to this email is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, or a person responsible for delivering it to the intended recipient, you are not authorised to and must not disclose, copy, distribute, or retain this message or any part of it. It may contain information which is confidential and/or covered by legal professional or other privilege (or other rules or laws with similar effect in jurisdictions outside England and Wales).
The views expressed in this email are not necessarily the views of Centrica plc, and the company, its directors, officers or employees make no representation or accept any liability for its accuracy or completeness unless expressly stated to the contrary.

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From malaclypse2 at gmail.com  Fri May  8 11:36:57 2009
From: malaclypse2 at gmail.com (Jerry Hill)
Date: Fri, 8 May 2009 11:36:57 -0400
Subject: Path difficulties with Python 2.5 running on Cygwin
In-Reply-To: <17a04789-b47e-465e-a715-9b512048405d@u39g2000pru.googlegroups.com>
References: <856d93a6-4bbe-4513-b2f2-8e0fa304c797@n7g2000prc.googlegroups.com>
	<17a04789-b47e-465e-a715-9b512048405d@u39g2000pru.googlegroups.com>
Message-ID: <16651e80905080836w2c6e159cu1b44127c9aef0d70@mail.gmail.com>

On Fri, May 8, 2009 at 11:29 AM, walterbyrd <walterbyrd at iname.com> wrote:
> I accidently named a script csv.py, put I deleted that.

You probably still have a stale csv.pyc in that directory.  Delete that too.

To tell for sure, open the python interpreter and do:
import csv
print csv.__file__

That will tell you exactly where the csv module is being loaded from.

-- 
Jerry


From darcy at druid.net  Fri May  8 11:37:20 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Fri, 8 May 2009 11:37:20 -0400
Subject: php to python code converter
In-Reply-To: <4A044D71.1000500@gmail.com>
References: <4A044D71.1000500@gmail.com>
Message-ID: <20090508113720.06d4a48e.darcy@druid.net>

On Fri, 08 May 2009 17:19:13 +0200
Pascal Chambon <chambon.pascal at gmail.com> wrote:
> That's funny, I was precisely thinking about a php to python converter, 
> some weeks ago.
> Such a tool, allowing for example to convert some CMS like Drupal to 
> python, would be a killer app, when we consider the amount of php code 
> available.

I'm not a big fan of PHP but I don't understand the desireability of
such a tool.  If you have a good PHP app just run it.  The point of
Python in my mind is that it is a cleaner syntax and promotes better
code.  Anything that converts PHP to Python is going to leave you with
some butt-ugly Python.  It also risks adding new bugs.

If you want a Python version of Drupal then perhaps that is the project
that you want to start.  Start fresh using the existing project as your
requirements specification.  Don't automatically import all their
coding choices that may be partially based on the language used.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From arnodel at googlemail.com  Fri May  8 11:41:12 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 08 May 2009 16:41:12 +0100
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com>
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com>
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com>
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com>
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com>
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com>
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com>
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com>
Message-ID: <m2y6t7pppj.fsf@googlemail.com>

John Yeung <gallium.arsenide at gmail.com> writes:

> On May 5, 11:37?pm, Ross <ross.j... at gmail.com> wrote:
>
>> On May 5, 10:33?am, MRAB <goo... at mrabarnett.plus.com> wrote:
>>
>> > Here's my approach (incomplete):
>>
>> FYI... I was testing your code further and discovered a strange
>> outcome... when there are 16 people for 7 courts, every 7th
>> round your code produces 4 byes instead of the correct 2 byes.
>
> Well, MRAB did say his was incomplete, and it's significantly shorter
> and cleaner than mine.
>
> Mine has even weirder-looking behavior at 16 players on 7 courts, but
> I think it's because mine tries harder to keep things balanced.  After
> a few rounds, the inequalities start to build up, and my routine picks
> some people more often to "catch up", but it doesn't prevent the same
> person from being scheduled for multiple matches the same week.  There
> may also be other, more subtle ways mine is broken.
>
> It also may be that the problem is inherently unsolvable for some
> values.  (I'm still waiting for someone with sufficient math ability
> to swoop in and either provide a way that works for all values, or
> confirm that there are just some unavoidable pathological cases.)
>
> John

I was thinking about this problem today.  What is needed is to generate
all matches between n players in an order such that any sequence of
(n//2-1) matches does not repeat any player.  If there are an even
number of players, this guarantees an even distribution of byes as well
(i.e. a difference of at most 1 between the highest and lowest number of
byes).  Unfortunately, if there are an odd number of players, I don't
think this is achievable because there are two sources of byes
unbalance:

* a player needs to be left out of each 'complete round' (where each
  player plays each other'

* some players are left out of each weekly round because there are not
  enough tennis courts for a complete round to be played in one week.

What I believe is achievable in the case of an odd number of players is
a difference of at most two between the highest and the lowest number of
byes for any player at any point in the tournament.

I don't have a proof of this because I haven't had the time to think
about it for long enough, but I have a toy implementation which I have
tested in a very limited manner.  I think it will generate tournaments
with the property that bye imbalance never exceeds 2. I also think it is
not possible to achieve better in general (it's a conjecture!).

----------------------------------------
from itertools import count

def matches(players):
    "Generates all matches between players"
    n = len(players)
    if n % 2:
        for i in xrange(n):
            for j in xrange(1, 1 + n/2):
                yield players[(i+j)%n], players[(i-j)%n]
    else:
        m = n - 1
        for i in xrange(m):
            yield players[-1], players[i]
            for j in xrange(1, n/2):
                yield players[(i+j)%m], players[(i-j)%m]

def print_matches(players):
    for line in zip(*matches(players)):
        print ' '.join(line)

def tournament(players, courts, nrounds=None):
    """
    players: list of players
    courts: list of courts
    nrounds: number of rounds needed or 
    """
    if nrounds is None:
        rounds = count(1)
    else:
        rounds = xrange(1, nrounds + 1)
    opponents = defaultdict(list)
    courts = courts[:len(players)/2]
    get_match = matches(players).next
    try:
        for round in rounds:
            print '-'*10
            print 'Round', round
            for court in courts:
                p1, p2 = get_match()
                print 'Court %s: %s - %s' % (court, p1, p2)
    except StopIteration:
        print "All matches played"
----------------------------------------

Example:

>>> players = ['Ann', 'Bea', 'Clo', 'Dee', 'Evi', 'Fae', 'Gil', 'Haz']
>>> courts = ['One', 'Two', 'Three']
>>> tournament(players, courts, 4)
----------
Round 1
Court One: Haz - Ann
Court Two: Bea - Gil
Court Three: Clo - Fae
----------
Round 2
Court One: Dee - Evi
Court Two: Haz - Bea
Court Three: Clo - Ann
----------
Round 3
Court One: Dee - Gil
Court Two: Evi - Fae
Court Three: Haz - Clo
----------
Round 4
Court One: Dee - Bea
Court Two: Evi - Ann
Court Three: Fae - Gil

HTH

-- 
Arnaud


From Scott.Daniels at Acm.Org  Fri May  8 11:47:11 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 08:47:11 -0700
Subject: unicode bit me
In-Reply-To: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
Message-ID: <0vadnQqkdrdQz5nXnZ2dnUVZ_uOdnZ2d@pdx.net>

anuraguniyal at yahoo.com wrote:
> #how can I print a list of object which may return unicode
> representation?
> # -*- coding: utf-8 -*-
> 
> class A(object):
> 
>     def __unicode__(self):
>         return u"?au"
> 
>     __str__ = __repr__ = __unicode__
> 
> a = A()
> 
> try:
>     print a # doesn't work?
> except UnicodeEncodeError,e:
>     print e
> try:
>     print unicode(a) # works, ok fine, great
> except UnicodeEncodeError,e:
>     print e
> try:
>     print unicode([a]) # what!!!! doesn't work?
> except UnicodeEncodeError,e:
>     print e
> """
> Now how can I print a list of object which may return unicode
> representation?
> loop/map is not an option as it goes much deepr in my real code
> any can anyoen explain what is happening here under the hood?
> """

<rant>It would be a bit easier if people would bother to mention
their Python version, as we regularly get questions from people
running 2.3, 2.4, 2.5, 2.6, 2.7a, 3.0, and 3.1b.  They run computers
with differing operating systems and versions such as: Windows 2000,
OS/X Leopard, ubuntu Hardy Heron, SuSE, ....

You might shocked to learn that a good answer often depends on the
particular situation above.  Even though it is easy to say, for example:
     platform.platform()  returns  'Windows-XP-5.1.2600-SP3'
     sys.version is
'2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit (Intel)]'
</rant>

What is happening is that print is writing to sys.stdout, and
apparently that doesn't know how to send unicode to that destination.
If you are running under IDLE, print goes to the output window, and
if you are running from the command line, it is going elsewhere.
the encoding that is being used for output is sys.stdout.encoding.

--Scott David Daniels
Scott.Daniels at Acm.Org


From Rumpf_A at web.de  Fri May  8 11:48:05 2009
From: Rumpf_A at web.de (Andreas Rumpf)
Date: Fri, 08 May 2009 17:48:05 +0200
Subject: Nimrod programming language
Message-ID: <159308160@web.de>

Dear Python-users,

I invented a new programming language called "Nimrod" that combines Python's readability with C's performance. Please check it out: http://force7.de/nimrod/
Any feedback is appreciated.

Regards,
Andreas Rumpf

______________________________________________________
GRATIS f?r alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!
Jetzt freischalten unter http://movieflat.web.de



From python at bdurham.com  Fri May  8 11:53:37 2009
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 08 May 2009 11:53:37 -0400
Subject: Pythonic way to normalize vertical whitespace
Message-ID: <1241798017.7066.1314483739@webmail.messagingengine.com>

I'm looking for suggestions on technique (not necessarily code)
about the most pythonic way to normalize vertical whitespace in
blocks of text so that there is never more than 1 blank line
between paragraphs. Our source text has newlines normalized to
single newlines (\n vs. combinations of \r and \n), but there may
be leading and trailing whitespace around each newline.
Approaches:
1. split text to list of lines that get stripped then:
a. walk this list building a new list of lines that track and
ignore extra blank lines
-OR-
b. re-join lines and replace '\n\n\n' wth' \n\n' until no more
'\n\n\n' matches exist
2. use regular expressions to match and replace whitespace
pattern of 3 or more adjacent \n's with surrounding whitespace
3. a 3rd party text processing library designed for efficiently
cleaning up text
Thanks!
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From walterbyrd at iname.com  Fri May  8 12:01:53 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Fri, 8 May 2009 09:01:53 -0700 (PDT)
Subject: Path difficulties with Python 2.5 running on Cygwin
References: <856d93a6-4bbe-4513-b2f2-8e0fa304c797@n7g2000prc.googlegroups.com>
	<17a04789-b47e-465e-a715-9b512048405d@u39g2000pru.googlegroups.com> 
	<mailman.5293.1241797020.11746.python-list@python.org>
Message-ID: <7cf3e5c5-1367-4272-af69-fa1d95d48123@b7g2000pre.googlegroups.com>

On May 8, 9:36?am, Jerry Hill <malaclyp... at gmail.com> wrote:
> On Fri, May 8, 2009 at 11:29 AM, walterbyrd <walterb... at iname.com> wrote:
> > I accidently named a script csv.py, put I deleted that.
>
> You probably still have a stale csv.pyc in that directory. ?Delete that too.
>

I don't, I am very certain of that. I have also used find to make
certain there are no other stray versions of csv.py.

> To tell for sure, open the python interpreter and do:
> import csv
> print csv.__file__
>
> That will tell you exactly where the csv module is being loaded from.

Problem is, python will not load the csv module, since it detects an
error. And since I can not load the module, csv.__file__ will not
work.


This file will work:
-----------------
#!/usr/bin/env python

# import csv

print "hello"
------------------


This file will not work:
-----------------
#!/usr/bin/env python

import csv

print "hello"
------------------


In later case, I get that error about 'module' object has no attribute
'reader'


From zondo42 at googlemail.com  Fri May  8 12:02:01 2009
From: zondo42 at googlemail.com (Glenn Hutchings)
Date: Fri, 08 May 2009 17:02:01 +0100
Subject: free chart lib for Python?
References: <mailman.5263.1241750053.11746.python-list@python.org>
Message-ID: <pan.2009.05.08.16.01.57.868847@googlemail.com>

On Fri, 08 May 2009 10:27:08 +0800, oyster wrote:

> I mean chart, not plot. If you don't know the difference, you can
> check www.advsofteng.com, which is a commercial program
> 
> is there such a thing with many kinds of chart, i.e. pie-chart,
> line-chart, ......?

You could try matplotlib: http://matplotlib.sourceforge.net.  That can do
all kinds of wizzo plotty/charty stuff.


From walterbyrd at iname.com  Fri May  8 12:07:42 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Fri, 8 May 2009 09:07:42 -0700 (PDT)
Subject: Path difficulties with Python 2.5 running on Cygwin
References: <856d93a6-4bbe-4513-b2f2-8e0fa304c797@n7g2000prc.googlegroups.com>
	<17a04789-b47e-465e-a715-9b512048405d@u39g2000pru.googlegroups.com> 
	<mailman.5293.1241797020.11746.python-list@python.org>
	<7cf3e5c5-1367-4272-af69-fa1d95d48123@b7g2000pre.googlegroups.com>
Message-ID: <bb5e3b95-8a39-4b1a-b720-0b325fe2262c@d38g2000prn.googlegroups.com>

On May 8, 10:01?am, walterbyrd <walterb... at iname.com> wrote:
> On May 8, 9:36?am, Jerry Hill <malaclyp... at gmail.com> wrote:
>
> > On Fri, May 8, 2009 at 11:29 AM, walterbyrd <walterb... at iname.com> wrote:
> > > I accidently named a script csv.py, put I deleted that.
>
> > You probably still have a stale csv.pyc in that directory. ?Delete that too.
>

Okay, I got it. I was looking for csv.py - because that is what I
accidently created. I don't know where csv.pyc came from, unless
python renamed it that when it tried to load csv.py, or something.

In any case, it seems to work now. Thanks again for your help.


From norseman at hughes.net  Fri May  8 12:09:01 2009
From: norseman at hughes.net (norseman)
Date: Fri, 08 May 2009 09:09:01 -0700
Subject: subprocess.Popen howto?
In-Reply-To: <4A035985.1080806@hughes.net>
References: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>
	<4A035985.1080806@hughes.net>
Message-ID: <4A04591D.5070501@hughes.net>


?ystein ;
         Down below: change >yourPy.py  to | yourPy.py
I just noticed the typo.

Sorry

Steve

norseman wrote:
> ?ystein Johansen (OJOHANS) wrote:
>> Hi,
>>  
>> I have problems understanding the subprocess.Popen object. I have a 
>> iterative calculation in a process running and I want to pipe the 
>> output (stdout) from this calculation to a Python script.
>>  
>> Let me include a simple code that simulates the calculating process:
>> /* This code simulates a big iterative calculation */
>> #include <stdio.h>
>> #include <math.h>
>>  
>> int main()
>> {
>>  float val[2] = { M_PI, M_E };
>>  int i;
>>  
>>  for ( i = 0; i < 2 i++) {
>>   sleep( 15 );   /* It's a hard calculation. It take 15 seconds */
>>   printf("Value: %5.6f\n", val[i] );
>>   fflush( stdout );
>>  }
>>  return 0;
>> }
>>  
>> let's compile this to mycalc: gcc -o mycalc calc.c ... (untested code)
>>  
>> In C I have this code which starts the mycalc process and handles the 
>> output from it:
>>  
>> #include <stdio.h>
>> #include <assert.h>
>> #define BUF_SIZE 256
>>  
>> int main()
>> {
>>  FILE *pip;
>>  char line[BUF_SIZE];
>>  
>>  pip = popen("mycalc", "r");
>>  assert( pip != NULL );
>>  
>>  while ( fgets( line, BUF_SIZE, pip )) {
>>   printf( "Hello; I got: %s \n", line );
>>   fflush( stdout );
>>  }
>>  pclose( pip );
>>  return 0;
>> }
>> How can I make such while-loop in Python? I assume I should use 
>> subprocess.Popen(), but I can't figure out how?
>>  
>> -?ystein
>>  
>>  
>>
>> -------------------------------------------------------------------
>> The information contained in this message may be CONFIDENTIAL and is
>> intended for the addressee only. Any unauthorised use, dissemination 
>> of the
>> information or copying of this message is prohibited. If you are not the
>> addressee, please notify the sender immediately by return e-mail and 
>> delete
>> this message.
>> Thank you.
>>
>>
>> ------------------------------------------------------------------------
>>
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
> ================================
> 
> If you don't like a lot of typing that obscures the process,
> take a look at os.Popen2  Pg.39 or so in Lib.pdf for 2.5.2
> In this case - the popen3 is probably your best bet.
> 
> I took a test run on "subprocess" a few months ago. My review:
> excessive typing to accomplish the simple.  BlackBox stuff is supposed 
> to be short and sweet.
> 
> BlackBox was the term applied to drivers and couplers back when.
> Back when: one started by writing a subroutine that got used.
>            next one got to write a program
>            next one got to write an application
>            then a BlackBox
>            from there one could graduate to OS
> That was back when!
> 
> 
> to repeat from another of my postings:
>                         ---
> processPython 2.5.2 (r252:60911, Mar  4 2008, 10:40:55)
> [GCC 3.3.6] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> 
>  >>> import os
>  >>> AbWd = os.spawnlp( os.P_WAIT,"abiword","abiword","")
> 
> The P_WAIT stops python until the program (abiword in this case) 
> completes.  The "" at the end are for tokens to be given to the program 
> and yes - contrary to manual, the program MUST be there TWICE (complete 
> with any path needed).
> 
> for windows this works:
> (for cut and paste from cmd.exe, see:
>   Re: Copy & Paste in a Dos box  from norseman  05/06/2009 4:28PM
> )
> 
> Python 2.5.1 ... on win32
>  >>> import os
>  >>> result = os.spawnl( os.P_WAIT, "d:\\winmcad\\mcad","")
> 
> Runs the program mcad. Returns to python when mcad exits.
>                         ---
> 
> 
> In your case:  substitute ..."your_compiled_c_program", " >yourPy.py")
>                 at the obvious places.
> 
> In case this isn't clear;
>   method 1:  py1.py starts compiled.c which redirects to yourPy.py
>   method 2:  py1.py uses os.popen3(compiled.c...) & the two work it out.
> In either case the receiver at the end stays open until completion so 
> sleep() things are not needed.  (may need to test for EOL and EOT)
> 
> HTH
> 
> Steve
> norseman at hughes.net
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 



From news.btinternet.com at erik.feegles.net  Fri May  8 12:11:14 2009
From: news.btinternet.com at erik.feegles.net (Basil Brush)
Date: Fri, 08 May 2009 17:11:14 +0100
Subject: Compiling snippets of python code
In-Reply-To: <3pmdnQdqr4ic3JnXnZ2dnUVZ_jWdnZ2d@pdx.net>
References: <RNOdnWjWTNq2jZnXnZ2dnUVZ8g6dnZ2d@bt.com>
	<3pmdnQdqr4ic3JnXnZ2dnUVZ_jWdnZ2d@pdx.net>
Message-ID: <opednRgtt9j9xJnXnZ2dnUVZ8jKdnZ2d@bt.com>

Scott David Daniels wrote:

> make lists and dictionaries containing functions, and that would be
> the normal Python way of handling this, rather than generating source
> from snippets.  You should take a look at Numpy if the "maths functions"

Thank you very much for your response. I hadn't thought of doing it that
way and I feel that would be the best way, especially as a list of maths
functions would make the code for genome recombination and mutation
simpler to rewrite.


Regards,
Erik


From google at mrabarnett.plus.com  Fri May  8 12:27:36 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 08 May 2009 17:27:36 +0100
Subject: Decorating methods - where do my arguments go?
In-Reply-To: <gu167u$svk$1@news.lysator.liu.se>
References: <gu167u$svk$1@news.lysator.liu.se>
Message-ID: <4A045D78.4000908@mrabarnett.plus.com>

Mikael Olofsson wrote:
> Hi all!
> 
> I have long tried to avoid decorators, but now I find myself in a 
> situation where I think they can help. I seem to be able to decorate 
> functions, but I fail miserably when trying to decorate methods. The 
> information I have been able to find on-line focuses on decorating 
> functions, and do not mention any special problem regarding methods.
> 
> Consider the following example. I start by defining a simple decorator:
> 
>  >>> class test_decorator(object):
> ...     def __init__(self,func):
> ...         self._func = func
> ...     def __call__(self, *args):
> ...         print 'Decorator:', args
> ...         self._func(*args)
> 
> Then I decorate a function:
> 
>  >>> @test_decorator
> ... def func(*args):
> ...     print 'Function: ', args
> 
> Let's try that:
> 
>  >>> func(1,2,3)
> Decorator: (1, 2, 3)
> Function:  (1, 2, 3)
> 
> OK! That was what I expected. Let's decorate a method:
> 
>  >>> class cls(object):
> ...     @test_decorator
> ...     def meth(self,*args):
> ...         print 'Method:   ', args
> 
> Then try that:
> 
>  >>> cls().meth(1,2,3)
> Decorator: (1, 2, 3)
> Method:    (2, 3)
> 
> Oops! That's weird. I had expected - or at least wanted - the same 
> result as for the function above.
> 
> Where did the first argument go? If it was sent to the original method 
> meth as the real first argument (self), then why did I not get an 
> exception?
> 
> More importantly: How do I write a decorator that does not drop arguments?
> 
> I guess it all has to do with the fact that the returned callable isn't 
> a method of cls. Is it possible to write a decorator that returns a 
> callable that is a method of cls, when used on methods in cls?
> 
 >>> class cls(object):
     @test_decorator
     def meth(self,*args):
         print 'self:     ', self
         print 'Method:   ', args

 >>> cls().meth(1,2,3)
Decorator: (1, 2, 3)
self:      1
Method:    (2, 3)


From chambon.pascal at wanadoo.fr  Fri May  8 12:27:42 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Fri, 08 May 2009 18:27:42 +0200
Subject: php to python code converter
In-Reply-To: <20090508113720.06d4a48e.darcy@druid.net>
References: <4A044D71.1000500@gmail.com>
	<20090508113720.06d4a48e.darcy@druid.net>
Message-ID: <4A045D7E.8060405@wanadoo.fr>

D'Arcy J.M. Cain a ?crit :
> On Fri, 08 May 2009 17:19:13 +0200
> Pascal Chambon <chambon.pascal at gmail.com> wrote:
>   
>> That's funny, I was precisely thinking about a php to python converter, 
>> some weeks ago.
>> Such a tool, allowing for example to convert some CMS like Drupal to 
>> python, would be a killer app, when we consider the amount of php code 
>> available.
>>     
>
> I'm not a big fan of PHP but I don't understand the desireability of
> such a tool.  If you have a good PHP app just run it.  The point of
> Python in my mind is that it is a cleaner syntax and promotes better
> code.  Anything that converts PHP to Python is going to leave you with
> some butt-ugly Python.  It also risks adding new bugs.
>
> If you want a Python version of Drupal then perhaps that is the project
> that you want to start.  Start fresh using the existing project as your
> requirements specification.  Don't automatically import all their
> coding choices that may be partially based on the language used.
>
>   
I agree that, in any way, the code resulting from this translation would 
be anything but pythonic :p

The point would rather be to consider code translated from php, ruby, 
perl or anything as extension modules, which have to be wrapped with 
pythonic interfaces (much like c/c++ libraries actually), or which are 
supposed to be deeply refactored.
It's always a pity when libraries available in a language have to be 
reproduced in another - even though building the translation tools would 
maybe ask for too much effort.

Concerning applications, like Drupal, it'd be different of course - I 
have no precise plan on how Drupal could be translated and then made 
"maintainable" in python, but for sure Python lacks a similar CMS, 
easier to approach than Plone and much more feature-full than others 
(Slemetonz, Pylucid...). And I don't feel quite ready for implementing 
such a thing myself ^^

Maybe the translation approach isn't the right one ; surely the best 
would be an interoperability at a lower level, like we have in Jpype, 
the DLR of .Net, Parrot, ironclad etc... but even with those projects, 
we're far from a fluent interoperability between languages, which would 
allow you to pick the best modules in the languages that fit the most 
for each of your tasks, on the platform you want  (I guess that's just a 
geeky dream).

Regards,
pascal


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From chambon.pascal at wanadoo.fr  Fri May  8 12:30:47 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Fri, 08 May 2009 18:30:47 +0200
Subject: php to python code converter
Message-ID: <4A045E37.2070304@wanadoo.fr>


D'Arcy J.M. Cain a ?crit :
> On Fri, 08 May 2009 17:19:13 +0200
> Pascal Chambon <chambon.pascal at gmail.com> wrote:
>   
>> That's funny, I was precisely thinking about a php to python converter, 
>> some weeks ago.
>> Such a tool, allowing for example to convert some CMS like Drupal to 
>> python, would be a killer app, when we consider the amount of php code 
>> available.
>>     
>
> I'm not a big fan of PHP but I don't understand the desireability of
> such a tool.  If you have a good PHP app just run it.  The point of
> Python in my mind is that it is a cleaner syntax and promotes better
> code.  Anything that converts PHP to Python is going to leave you with
> some butt-ugly Python.  It also risks adding new bugs.
>
> If you want a Python version of Drupal then perhaps that is the project
> that you want to start.  Start fresh using the existing project as your
> requirements specification.  Don't automatically import all their
> coding choices that may be partially based on the language used.
>
>   
I agree that, in any way, the code resulting from this translation would 
be anything but pythonic :p

The point would rather be to consider code translated from php, ruby, 
perl or anything as extension modules, which have to be wrapped with 
pythonic interfaces (much like c/c++ libraries actually), or which are 
supposed to be deeply refactored.
It's always a pity when libraries available in a language have to be 
reproduced in another - even though building the translation tools would 
maybe ask for too much effort.

Concerning applications, like Drupal, it'd be different of course - I 
have no precise plan on how Drupal could be translated and then made 
"maintainable" in python, but for sure Python lacks a similar CMS, 
easier to approach than Plone and much more feature-full than others 
(Slemetonz, Pylucid...). And I don't feel quite ready for implementing 
such a thing myself ^^

Maybe the translation approach isn't the right one ; surely the best 
would be an interoperability at a lower level, like we have in Jpype, 
the DLR of .Net, Parrot, ironclad etc... but even with those projects, 
we're far from a fluent interoperability between languages, which would 
allow you to pick the best modules in the languages that fit the most 
for each of your tasks, on the platform you want  (I guess that's just a 
geeky dream).

Regards,
pascal


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From cgoldberg at gmail.com  Fri May  8 12:32:31 2009
From: cgoldberg at gmail.com (cgoldberg)
Date: Fri, 8 May 2009 09:32:31 -0700 (PDT)
Subject: free chart lib for Python?
References: <mailman.5263.1241750053.11746.python-list@python.org> 
	<pan.2009.05.08.16.01.57.868847@googlemail.com>
Message-ID: <abfaccb1-3ec9-4c4b-bca3-8ecd5d110f05@t10g2000vbg.googlegroups.com>

> You could try matplotlib:http://matplotlib.sourceforge.net.

+1 Matplotlib.
It's a very nice module with impressive graphing/charting/plotting
capabilities.


From dotancohen at gmail.com  Fri May  8 12:33:10 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Fri, 8 May 2009 19:33:10 +0300
Subject: php to python code converter
In-Reply-To: <20090508113720.06d4a48e.darcy@druid.net>
References: <4A044D71.1000500@gmail.com>
	<20090508113720.06d4a48e.darcy@druid.net>
Message-ID: <880dece00905080933t4379ab21h3973e8d624769d06@mail.gmail.com>

> I'm not a big fan of PHP but I don't understand the desireability of
> such a tool. ?If you have a good PHP app just run it. ?The point of
> Python in my mind is that it is a cleaner syntax and promotes better
> code. ?Anything that converts PHP to Python is going to leave you with
> some butt-ugly Python. ?It also risks adding new bugs.
>
> If you want a Python version of Drupal then perhaps that is the project
> that you want to start. ?Start fresh using the existing project as your
> requirements specification. ?Don't automatically import all their
> coding choices that may be partially based on the language used.
>

It would be a great learning tool. I am pretty decent with PHP but
just getting started in Python. This might help such users flatten out
the learning curve.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il


From Shawn at Milochik.com  Fri May  8 12:36:12 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Fri, 8 May 2009 12:36:12 -0400
Subject: xml in python
In-Reply-To: <f46c52560905080046t4b9611vb304df22703eb744@mail.gmail.com>
References: <f46c52560905080046t4b9611vb304df22703eb744@mail.gmail.com>
Message-ID: <2dc0c81b0905080936m7cf9aaecn243d2b9c17cc3b8@mail.gmail.com>

On Fri, May 8, 2009 at 3:46 AM, Rustom Mody <rustompmody at gmail.com> wrote:
> Can someone give me a heads up on xml parsing in python?
> The context is that I want to write a simple docbook to text converter.
> DOM is alright -- dont want to break my head with SAX just for performance
> when my documents are not likely to be large.
>
> My problem is that there seems to be so many nearly equivalent ways (Pyxml?
> Amara?) some of which have moved from 3rd party to builtin status that I am
> not clear what is the current method of choice.
>
> Thanks
> --

I've been using minidom for simple XML processing with success. The
XML module seems to be the way to go, considering how many of its
child modules are listed on http://docs.python.org/library/.

import xml.dom.minidom as minidom

Shawn


From andrew at acooke.org  Fri May  8 12:38:33 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 8 May 2009 12:38:33 -0400 (CLT)
Subject: SQL and CSV
In-Reply-To: <b7c68e74-21ae-4133-a058-e3c669f0faf6@o20g2000vbh.googlegroups.com>
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
	<gu0ofm$oj9$00$1@news.t-online.com> <gu141o$iek$4@lust.ihug.co.nz>
	<mailman.5285.1241786958.11746.python-list@python.org>
	<b7c68e74-21ae-4133-a058-e3c669f0faf6@o20g2000vbh.googlegroups.com>
Message-ID: <7aae1530c7ea92c927154597c34c49cc.squirrel@localhost>


even if you're not open to injection attacks, you're still less likely to
get escaping correct than a puprose written, widely used library.

my request for more information was directed to lawrence, who said "until
you hit things it can't deal with" which seemed to be some kind of cryptic
argument against parameters.

andrew


Nick wrote:
> On May 8, 1:49?pm, "andrew cooke" <and... at acooke.org> wrote:
>> Lawrence D'Oliveiro wrote:
>> > In message <gu0ofm$oj9$0... at news.t-online.com>, Peter Otten wrote:
>>
>> >> While it may not matter here using placeholders instead of manually
>> >> escaping user-provided values is a good habit to get into.
>>
>> > Until you hit things it can't deal with.
>>
>> The post you are replying to was talking about using the SQL library's
>> "?"
>> syntax that automatically escapes values. ?The usual reason this is
>> recommended (if I have understood correctly) is that the library code is
>> much more likely to foil injection attacks. ?I have seen this mentioned
>> often and assume it is good advice.
>>
>> Can you expand on your comment? ?I assume you are thinking of how the
>> library might handle some strange class. ?But aren't the number of types
>> limited by SQL? ?In which case a "thing that can't be handled" could
>> presumably be managed by adding an appropriate __str__ or __float__ or
>> whatever? ?And you would still use the library to give safety with other
>> values.
>>
>> Maybe you could give an example of the kind of problem you're thinking
>> of?
>>
>> Thanks,
>> Andrew
>
> Injection attacks aren't an issue, its a local app.
>
> It's part of a reconciliation system, where sometimes data is in csv
> files. If you want the whole csv file, you can use csv module without
> a problem.
>
> In some cases, I need to manipulate the data.
>
> The choices are hard code the manipulation, or load the data from a
> config file.
>
> So what I've got is the query in the config and I can process it.
>
> Nick
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From __peter__ at web.de  Fri May  8 12:39:29 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 08 May 2009 18:39:29 +0200
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
Message-ID: <gu1n81$ir7$03$1@news.t-online.com>

Mikael Olofsson wrote:

> Hi all!
> 
> I have long tried to avoid decorators, but now I find myself in a
> situation where I think they can help. I seem to be able to decorate
> functions, but I fail miserably when trying to decorate methods. The
> information I have been able to find on-line focuses on decorating
> functions, and do not mention any special problem regarding methods.
> 
> Consider the following example. I start by defining a simple decorator:
> 
>  >>> class test_decorator(object):
> ...     def __init__(self,func):
> ...         self._func = func
> ...     def __call__(self, *args):
> ...         print 'Decorator:', args
> ...         self._func(*args)
> 
> Then I decorate a function:
> 
>  >>> @test_decorator
> ... def func(*args):
> ...     print 'Function: ', args
> 
> Let's try that:
> 
>  >>> func(1,2,3)
> Decorator: (1, 2, 3)
> Function:  (1, 2, 3)
> 
> OK! That was what I expected. Let's decorate a method:
> 
>  >>> class cls(object):
> ...     @test_decorator
> ...     def meth(self,*args):
> ...         print 'Method:   ', args
> 
> Then try that:
> 
>  >>> cls().meth(1,2,3)
> Decorator: (1, 2, 3)
> Method:    (2, 3)
> 
> Oops! That's weird. I had expected - or at least wanted - the same
> result as for the function above.
> 
> Where did the first argument go? If it was sent to the original method
> meth as the real first argument (self), then why did I not get an
> exception?
> 
> More importantly: How do I write a decorator that does not drop arguments?
> 
> I guess it all has to do with the fact that the returned callable isn't
> a method of cls. Is it possible to write a decorator that returns a
> callable that is a method of cls, when used on methods in cls?
> 
> /MiO

You have to turn your decorator into a descriptor by providing a __get__() 
method. A primitive example:

class test_decorator(object):
    def __init__(self,func):
        self._func = func
    def __call__(self, *args):
        print 'Decorator:', args
        self._func(self.inst, *args)
    def __get__(self, inst, cls):
        self.inst = inst
        return self

Read more about the details at

http://users.rcn.com/python/download/Descriptor.htm

Peter



From Scott.Daniels at Acm.Org  Fri May  8 12:44:37 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 09:44:37 -0700
Subject: Path difficulties with Python 2.5 running on Cygwin
In-Reply-To: <bb5e3b95-8a39-4b1a-b720-0b325fe2262c@d38g2000prn.googlegroups.com>
References: <856d93a6-4bbe-4513-b2f2-8e0fa304c797@n7g2000prc.googlegroups.com>
	<17a04789-b47e-465e-a715-9b512048405d@u39g2000pru.googlegroups.com>
	<mailman.5293.1241797020.11746.python-list@python.org>
	<7cf3e5c5-1367-4272-af69-fa1d95d48123@b7g2000pre.googlegroups.com>
	<bb5e3b95-8a39-4b1a-b720-0b325fe2262c@d38g2000prn.googlegroups.com>
Message-ID: <RZidnfvE3Ybf_ZnXnZ2dnUVZ_gudnZ2d@pdx.net>

walterbyrd wrote:
> On May 8, 10:01 am, walterbyrd <walterb... at iname.com> wrote:
>> On May 8, 9:36 am, Jerry Hill <malaclyp... at gmail.com> wrote:
>>
>>> On Fri, May 8, 2009 at 11:29 AM, walterbyrd <walterb... at iname.com> wrote:
>>>> I accidently named a script csv.py, put I deleted that.
>>> You probably still have a stale csv.pyc in that directory.  Delete that too.
> Okay, I got it. I was looking for csv.py - because that is what I
> accidently created. I don't know where csv.pyc came from, unless
> python renamed it that when it tried to load csv.py, or something.

You _need_ to understand where csv.pyc came from, or you will hit
this problem frequently.

When you import any module in python, the python interpreter looks
for a "compiled" version of that mdule -- a .pyc (or when optimizing
.pyo) file.  If it finds it, it checks that it was compiled from the
corresponding .py (or .pyw) file.  If no .pyc is found, or if the
.pyc that was found doesn't match the corresponding .py file, the
.py (or .pyw) file is "compiled into either a .pyc or .pyo, and the
contents of that .pyc or .pyo are used to build the module.

So, importing a module will write a .pyc or .pyo file unless an
appropriate .pyc or .pyo file is found.

--Scott David Daniels
Scott.Daniels at Acm.Org


From iwan at reahl.org  Fri May  8 13:01:57 2009
From: iwan at reahl.org (Iwan Vosloo)
Date: Fri, 08 May 2009 19:01:57 +0200
Subject: How to debug this import problem?
Message-ID: <1241802117.7241.37.camel@easymoney>

Hi there,

We have a rather complicated program which does a bit of os.chdir and
sys.path manipulations.  In between all of this, it imports the decimal
module several times.

However, it imports a new instance of decimal sometimes.  (Which is a
problem, since a decimal.Decimal (imported at point A) now is not the
same as that imported somewhere else.

In trying to figure out what's happening, we've changed the code in
decimal to print out id(sys) when decimal gets imported.  This also
gives back different values at different times.  My suspicion is that
when importing python tries to check sys.modules - but each time sys is
a different sys already.

Any ideas of how we can gather more data to find out exactly what causes
this? The path manipulations is a suspect, but unfortunately we cannot
remove it.  If we can trace the problem from the import end though, we
may be able to isolate the exact one which is the problem.

This code incidentally also runs in a virtualenv environment AND uses
setuptools.  None of these complications can be removed...

Regards
- Iwan



From enricong at gmail.com  Fri May  8 13:04:09 2009
From: enricong at gmail.com (enricong at gmail.com)
Date: Fri, 8 May 2009 10:04:09 -0700 (PDT)
Subject: building 32-bit PyQT4 and matplotlib on X86_64
Message-ID: <038e847e-49aa-4cef-b2f6-20ef93fed62d@q14g2000vbn.googlegroups.com>

I'm having some issues attempting to build PyQT4 and matplotlib.  I'm
on a 64-bit machine and am trying to build a 32-bit version.  I have
already installed seperate 32-bit libs and a 32-bit version of python
however I continue to run into two basic problems

With PyQT4, I dont know how to tell it that I want to compile 32bit.
I run into a problem at the very beginning when it runts qtdirs.mk and
there -m32 isnt there.  I tried adding it in and manually running
make, but then I have the second problem

with matplotlib and PyQT4, eventhough the "-m32" flag is being used
with g++ and /usr/lib is included in the library search path, I run
into problems where I get a message saying something like:

/usr/bin/ld: skipping incompatible /usr/lib64/libz.so when searching
for -lz
then
/usr/bin/ld: cannot find -lz

I had this exact problem with a few modules while trying to build
Python 32 bit, however I was able to substitude -lz with the full path
to the library /usr/lib/libz.so.1

This would be impractical to do with matplotlib.
This is also just one example, I have problems with other libraries
too.




From aahz at pythoncraft.com  Fri May  8 13:14:48 2009
From: aahz at pythoncraft.com (Aahz)
Date: 8 May 2009 10:14:48 -0700
Subject: How do I test the integrity of a Python installation in Debian and
	Ubuntu
References: <mailman.5282.1241783298.11746.python-list@python.org>
Message-ID: <gu1pa8$4mj$1@panix3.panix.com>

In article <mailman.5282.1241783298.11746.python-list at python.org>,
Geoff Gardiner  <ggardiner at iee.org> wrote:
>
>How do I assure myself of the integrity of a Python installation
>acquired using apt-get install on Debian and Ubuntu?

How important is the apt-get requirement?  Building Python yourself in
this situation sounds like it would be simpler/safer.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From marco.mandl at gmx.at  Fri May  8 13:14:52 2009
From: marco.mandl at gmx.at (Marco)
Date: Fri, 08 May 2009 19:14:52 +0200
Subject: import overwrites __name__
Message-ID: <gu1pad$afi$1@ger.gmane.org>

Hi,

There happened something that I do not understand. Actually I don't even 
know how it can be possible.

I import a module and then the name space of the importing module seems do 
be overwritten.

my_name = __name__
print my_name
print len(dir())
from x import y as z
print __name__
print len(dir())
print my_name

->
__main__
119
x
117
unhandled NameError "name 'my_name' is not defined"

The module x is from me, and I am not aware of doing anything cruel there. 
What evil thing can be done in its sub module that can result in that 
strange thing?

br
Marco




From darcy at druid.net  Fri May  8 13:28:45 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Fri, 8 May 2009 13:28:45 -0400
Subject: php to python code converter
In-Reply-To: <880dece00905080933t4379ab21h3973e8d624769d06@mail.gmail.com>
References: <4A044D71.1000500@gmail.com>
	<20090508113720.06d4a48e.darcy@druid.net>
	<880dece00905080933t4379ab21h3973e8d624769d06@mail.gmail.com>
Message-ID: <20090508132845.0b3a1976.darcy@druid.net>

On Fri, 8 May 2009 19:33:10 +0300
Dotan Cohen <dotancohen at gmail.com> wrote:
> It would be a great learning tool. I am pretty decent with PHP but
> just getting started in Python. This might help such users flatten out
> the learning curve.

If there were such a tool available I would sugegst it come with huge
warnings suggesting that the resulting code not be used for learning
purposes.  You would still be much better off with the tutorials.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From gagsl-py2 at yahoo.com.ar  Fri May  8 13:28:50 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 08 May 2009 14:28:50 -0300
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
	<op.uti1kf0ga8ncjz@gnudebst> <1241649200.4a0210301f77e@mail.uh.cu>
	<mailman.5189.1241657949.11746.python-list@python.org>
	<pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>
	<1241663543.4a024837a9680@mail.uh.cu>
Message-ID: <op.utmf6dddx6zn5v@gabriel.sleipnir-bsas>

En Wed, 06 May 2009 23:32:23 -0300, Luis Alberto Zarrabeitia Gomez  
<kyrie at uh.cu> escribi?:

>
> Quoting Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>:
>
>> But regardless, everyone is missing the most important point: why are  
>> you
>> copying and pasting code in the first place? That is surely very close  
>> to
>> the top of the list of Worst Ever Anti-Patterns, and it should be  
>> avoided
>> whenever possible.
>
> [btw, I took this long before jumping into this thread for this precise
> reason... Copy/paste is an evil anti-pattern.
>
>> In Python, we can avoid much copy-and-paste coding with decorators.  
>> Given
>> one function, we can create as many variants as we want, differing in  
>> pre-
>> processing of arguments and post-processing of results, by using
>> decorators. This is a powerful ability to have, but it's crippled for
>> many recursive functions, because recursive functions in Python don't
>> actually call themselves, they call whatever happens to be bound to  
>> their
>> name at runtime.
>
> A bit offtopic: a while ago I think I saw a recipe for a decorator that,  
> via
> bytecode hacks, would bind otherwise global names to the local namespace  
> of the
> function. Can anyone remember it/point me to it? An @bind decorator that  
> would
> 'localize' all the global names, including the still unexistent but  
> already know
> function name, would guarantee that at least recursion calls the same  
> function
> instead of "whatever happens to be bound to their name at runtime". If  
> it wasn't
> a hack, anyway.

I could not find such thing, but here it is something similar (mostly a  
proof-of-concept).
Basically, modifies the bytecode so global references become local ones,  
and then injects a new argument whose default value is the desired value.  
It can be used to make all references to the function name to refer to the  
function itself; also, the __function__ variant can be implemented.

<code>
 from opcode import HAVE_ARGUMENT, opmap

def iter_code(co):
   """Iterate over a code object."""
   code = co.co_code
   n = len(code)
   i = 0
   while i < n:
     op = ord(code[i])
     if op >= HAVE_ARGUMENT:
       oparg = ord(code[i+1]) + ord(code[i+2])*256
       yield code[i:i+3], op, oparg
       i += 3
     else:
       yield code[i], op, None
       i += 1

def replace_bytecode(code, iname_global, iname_local):
   LOAD_GLOBAL = opmap['LOAD_GLOBAL']
   LOAD_FAST = opmap['LOAD_FAST']
   STORE_GLOBAL = opmap['STORE_GLOBAL']
   STORE_FAST = opmap['STORE_FAST']
   for codestr, op, oparg in iter_code(code):
     if op==LOAD_GLOBAL and oparg==iname_global:
       codestr = chr(LOAD_FAST) + chr(iname_local % 256) + chr(iname_local  
// 256)
     elif op==STORE_GLOBAL and oparg==iname_global:
       codestr = chr(STORE_FAST) + chr(iname_local % 256) + chr(iname_local  
// 256)
     yield(codestr)

class GlobalToLocalWarning(RuntimeWarning): pass

def global_to_local(function, refname, value):
   """
   Make all references to `refname` local instead of global.
   Actually, transform
     def function(a,b,c):
   into
     def function(a,b,c,refname=value)
   """
   code = function.func_code
   if refname not in code.co_names:
     import warnings
     warnings.warn(GlobalToLocalWarning('no reference to "%s" found in %s'  
% (refname, function.func_name)), stacklevel=2)
     return function
   # insert refname just after the last argument
   varnames = list(code.co_varnames)
   varnames.insert(code.co_argcount, refname)
   # new bytecode using LOAD_FAST instead of LOAD_GLOBAL
   iname_global = code.co_names.index(refname) # LOAD_GLOBAL/STORE_GLOBAL  
operand
   iname_local = code.co_argcount # LOAD_FAST/STORE_FAST operand
   rawcode = ''.join(replace_bytecode(code, iname_global, iname_local))
   function.func_code = type(code)(
      code.co_argcount + 1,
      code.co_nlocals + 1,
      code.co_stacksize,
      code.co_flags,
      rawcode,
      code.co_consts,
      code.co_names,
      tuple(varnames),
      code.co_filename,
      code.co_name,
      code.co_firstlineno,
      code.co_lnotab
      )
   # the desired value is the default value of the new, fake argument
   if function.func_defaults is None:
     function.func_defaults = (value,)
   else:
     function.func_defaults += (value,)
   return function

# decorator: function name refers to itself
def recursive3(function):
   return global_to_local(function, function.func_name, function)

@recursive3
def fibo(n):
   if n<=1: return 1
   return fibo(n-1) + fibo(n-2)
   # those "fibo" won't be global anymore

# decorator: name '__function__' refers to function
def recursive4(function):
   return global_to_local(function, '__function__', function)

def factorial(n):
   @recursive4
   def _factorial(n, acc):
     if n<=1: return acc
     return __function__(n-1, n*acc)
   return _factorial(n, 1)

print fibo, fibo.__name__, fibo.func_name, fibo.func_code.co_name
assert fibo(5)==8
F10=factorial(10)
assert F10==2*3*4*5*6*7*8*9*10

foo = fibo
bar = factorial
del fibo, factorial
assert foo(5)==8
assert bar(10)==F10

import inspect
assert inspect.getargspec(foo).defaults[0] is foo
</code>

-- 
Gabriel Genellina



From norseman at hughes.net  Fri May  8 13:32:34 2009
From: norseman at hughes.net (norseman)
Date: Fri, 08 May 2009 10:32:34 -0700
Subject: subprocess.Popen howto?
In-Reply-To: <3aaa4e6e-c2c0-43e0-a483-7c79c46137a9@s16g2000vbp.googlegroups.com>
References: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>
	<mailman.5249.1241733498.11746.python-list@python.org>
	<3aaa4e6e-c2c0-43e0-a483-7c79c46137a9@s16g2000vbp.googlegroups.com>
Message-ID: <4A046CB2.3080101@hughes.net>

Carl Banks wrote:
> On May 7, 2:58 pm, norseman <norse... at hughes.net> wrote:
>> If you don't like a lot of typing that obscures the process,
>> take a look at os.Popen2  Pg.39 or so in Lib.pdf for 2.5.2
>> In this case - the popen3 is probably your best bet.
>>
>> I took a test run on "subprocess" a few months ago. My review:
>> excessive typing to accomplish the simple.
> 
> 
> Hmm, I won't argue that it can be excessive typing, but I think its
> purpose isn't to accomplish the simple but to hit all the corners of
> subprocesses.
> 
> What if you want os.system without the shell?  What if you want popen
> with the shell?  On Windows what if I want a subprocess without a
> console from a Python program in a console.  Stuff like that.
> 
Shell?  You lost me.
Why would you even use Windows?  Just kidding.
   Build the TSR and Start from Python or the bootup autostart
   and use it from Python or whatever.
Those in Unix, put the " &" after the program name in the starter
   to get it to background. Be sure to use P_NOWAIT in the starter.

> I still use os.system for Q&D stuff, but now use subprocess for
> everything else since I prefer thorough to short and sweet.

As long as speed (volume vs time) isn't a problem - OK.

> 
> 
> Carl Banks
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
==================================

         1)  That one has access to and can make for ones self choices is
               freedom.
         2)  As far as forcing a 'do all' into use is concerned,
               especially at the expense of removing others choices
               (Python notes say subprocess is supplanting popen et al),
               well... that is dictitorial, anti-freedom.
         3)  Consider this: a do all is as useful as driving a Ferrari on
               a Jeep Jamboree cross crountry race. Or chasing a Ferrari
               through paved mountain roads with a Jeep.  The SUV is
               supposed to be a "do all". Would you actually expect it to
               win either race?  After all, they are all "cars".
Use/create the proper tool for the job. I do not know any good mechanics 
that have a monkey-wrench (a crescent) in their tool box.  And all of 
them will tell you that the guy who picks one up and starts toward the 
car may be upset with the driver but he is not a mechanic.
(Wrong tool of choice. Besides, should not have been available. :)
(Use the long handle 1/2" socket drive ratchet. Weight, length and 
balance are just right. ;)

Everybody - Read #1 one more time and make it (speak out loud) "my way".
If the client is happy, who cares how it was done?  But don't force 
others ....  (Python admins taking notes?)

Steve



From deets at nospam.web.de  Fri May  8 13:39:31 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 08 May 2009 19:39:31 +0200
Subject: How to debug this import problem?
References: <mailman.5300.1241802485.11746.python-list@python.org>
Message-ID: <76j8vcF1crfkoU1@mid.uni-berlin.de>

Iwan Vosloo wrote:

> Hi there,
> 
> We have a rather complicated program which does a bit of os.chdir and
> sys.path manipulations.  In between all of this, it imports the decimal
> module several times.
> 
> However, it imports a new instance of decimal sometimes.  (Which is a
> problem, since a decimal.Decimal (imported at point A) now is not the
> same as that imported somewhere else.
> 
> In trying to figure out what's happening, we've changed the code in
> decimal to print out id(sys) when decimal gets imported.  This also
> gives back different values at different times.  My suspicion is that
> when importing python tries to check sys.modules - but each time sys is
> a different sys already.
> 
> Any ideas of how we can gather more data to find out exactly what causes
> this? The path manipulations is a suspect, but unfortunately we cannot
> remove it.  If we can trace the problem from the import end though, we
> may be able to isolate the exact one which is the problem.
> 
> This code incidentally also runs in a virtualenv environment AND uses
> setuptools.  None of these complications can be removed...

Try putting an "import pdb; pdb.set_trace()" on top of the decimal module.
Then you can see whenever it gets imported new, and with "bt" get a
backtrace, and you can inspect (and thus eventually compare) the various
states of sys.path and sys.modules.

Diez



From deets at nospam.web.de  Fri May  8 13:43:50 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 08 May 2009 19:43:50 +0200
Subject: php to python code converter
References: <4A044D71.1000500@gmail.com>
	<20090508113720.06d4a48e.darcy@druid.net>
	<mailman.5298.1241800394.11746.python-list@python.org>
Message-ID: <76j97fF1crfkoU2@mid.uni-berlin.de>

Dotan Cohen wrote:

>> I'm not a big fan of PHP but I don't understand the desireability of
>> such a tool. ?If you have a good PHP app just run it. ?The point of
>> Python in my mind is that it is a cleaner syntax and promotes better
>> code. ?Anything that converts PHP to Python is going to leave you with
>> some butt-ugly Python. ?It also risks adding new bugs.
>>
>> If you want a Python version of Drupal then perhaps that is the project
>> that you want to start. ?Start fresh using the existing project as your
>> requirements specification. ?Don't automatically import all their
>> coding choices that may be partially based on the language used.
>>
> 
> It would be a great learning tool. I am pretty decent with PHP but
> just getting started in Python. This might help such users flatten out
> the learning curve.

I'm almost 100% sure it won't. The code is machine-generated, thus not easy
to the human eye, not idiomatic so you don't learn how to write good python
through it. You learn how to jump through hoops to code the same way in
python that you do in PHP.

Diez



From dotancohen at gmail.com  Fri May  8 14:03:35 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Fri, 8 May 2009 21:03:35 +0300
Subject: php to python code converter
In-Reply-To: <76j97fF1crfkoU2@mid.uni-berlin.de>
References: <4A044D71.1000500@gmail.com>
	<20090508113720.06d4a48e.darcy@druid.net>
	<mailman.5298.1241800394.11746.python-list@python.org>
	<76j97fF1crfkoU2@mid.uni-berlin.de>
Message-ID: <880dece00905081103i4e6127c4kd8e6c60642bb69ef@mail.gmail.com>

> I'm almost 100% sure it won't. The code is machine-generated, thus not easy
> to the human eye, not idiomatic so you don't learn how to write good python
> through it. You learn how to jump through hoops to code the same way in
> python that you do in PHP.
>

I meant for single functions, not for translating entire apps.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il


From gruszczy at gmail.com  Fri May  8 14:04:17 2009
From: gruszczy at gmail.com (=?UTF-8?Q?Filip_Gruszczy=C5=84ski?=)
Date: Fri, 8 May 2009 20:04:17 +0200
Subject: ECG segmentation
Message-ID: <1be78d220905081104s64e7191na38e3517b24828d8@mail.gmail.com>

Hi!

I need to create a script, that performs ECG segmentation, but I can
hardly find any useful materials on the web. Did anyone try to do this
and could point me to some good materials/snippets about this?

-- 
Filip Gruszczy?ski


From musicguy at alphaios.net  Fri May  8 14:05:45 2009
From: musicguy at alphaios.net (The Music Guy)
Date: Fri, 8 May 2009 13:05:45 -0500
Subject: FLV download script works, but I want to enhance it
In-Reply-To: <gtur8q$b2n$1@panix3.panix.com>
References: <mailman.5134.1241579669.11746.python-list@python.org> 
	<gtur8q$b2n$1@panix3.panix.com>
Message-ID: <f61e9a8c0905081105o73ee4a8xd89fc67019187ba7@mail.gmail.com>

On Thu, May 7, 2009 at 9:29 AM, Aahz <aahz at pythoncraft.com> wrote:
>
> Here's my download script to get you started figuring this out, it does
> the wget in the background so that several downloads can run in parallel
> from a single terminal window:
>
> #!/bin/bash
>
> echo "Downloading $1"
> wget "$1" > /dev/null 2>&1 &
> --
> Aahz (aahz at pythoncraft.com) ? ? ? ? ? <*> ? ? ? ? http://www.pythoncraft.com/
>
> "It is easier to optimize correct code than to correct optimized code."
> --Bill Harlan
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Aahz,

Thanks for the reply, but unfortunately that script is going in the
complete wrong direction.

Firstly, downloading multiple files in tandem does not speed up the
process as it merely cuts up the already limited bandwidth into even
smaller pieces and delays every download in progress. It is much
better to queue downloads to occur one-by-one.

Secondly, that approach is based on bash rather than Python. I know I
could use the `&` operator on a command line to background processes,
but I would like to be able to have more control through Python and
the use of the subprocess or threading modules.


From google at mrabarnett.plus.com  Fri May  8 14:10:48 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 08 May 2009 19:10:48 +0100
Subject: import overwrites __name__
In-Reply-To: <gu1pad$afi$1@ger.gmane.org>
References: <gu1pad$afi$1@ger.gmane.org>
Message-ID: <4A0475A8.4060206@mrabarnett.plus.com>

Marco wrote:
> Hi,
> 
> There happened something that I do not understand. Actually I don't even 
> know how it can be possible.
> 
> I import a module and then the name space of the importing module seems do 
> be overwritten.
> 
> my_name = __name__
> print my_name
> print len(dir())
> from x import y as z
> print __name__
> print len(dir())
> print my_name
> 
> ->
> __main__
> 119
> x
> 117
> unhandled NameError "name 'my_name' is not defined"
> 
> The module x is from me, and I am not aware of doing anything cruel there. 
> What evil thing can be done in its sub module that can result in that 
> strange thing?
> 
You'd have to show us the module. Try to make the smallest module that
has the same effect.


From Scott.Daniels at Acm.Org  Fri May  8 14:21:24 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 11:21:24 -0700
Subject: How to debug this import problem?
In-Reply-To: <76j8vcF1crfkoU1@mid.uni-berlin.de>
References: <mailman.5300.1241802485.11746.python-list@python.org>
	<76j8vcF1crfkoU1@mid.uni-berlin.de>
Message-ID: <DumdnY8P7-xs65nXnZ2dnUVZ_jidnZ2d@pdx.net>

Diez B. Roggisch wrote:
> Iwan Vosloo wrote:
>> We have a rather complicated program which does a bit of os.chdir and
>> sys.path manipulations.  In between all of this, it imports the decimal
>> module several times....
>> However, it imports a new instance of decimal sometimes.  (Which is a
>> problem, since a decimal.Decimal (imported at point A) now is not the
>> same as that imported somewhere else....
>>
>> In trying to figure out what's happening, we've changed the code in
>> decimal to print out id(sys) when decimal gets imported.  This also
>> gives back different values at different times.  My suspicion is that
>> when importing python tries to check sys.modules - but each time sys is
>> a different sys already.
>>
>> Any ideas of how we can gather more data to find out exactly what causes
>> this? The path manipulations is a suspect, but unfortunately we cannot
>> remove it.  If we can trace the problem from the import end though, we
>> may be able to isolate the exact one which is the problem.
>>
>> This code incidentally also runs in a virtualenv environment AND uses
>> setuptools.  None of these complications can be removed...
> 
> Try putting an "import pdb; pdb.set_trace()" on top of the decimal module.
> Then you can see whenever it gets imported new, and with "bt" get a
> backtrace, and you can inspect (and thus eventually compare) the various
> states of sys.path and sys.modules.


You can also run Python with the "-v" or "-vv" flags to get output
about exactly what files are getting imported from the file
system and when.  "-v" iswhat it got, "-vv" is everywhere it tries.

--Scott David Daniels
Scott.Daniels at Acm.Org


From tjreedy at udel.edu  Fri May  8 14:22:32 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 08 May 2009 14:22:32 -0400
Subject: unicode bit me
In-Reply-To: <0vadnQqkdrdQz5nXnZ2dnUVZ_uOdnZ2d@pdx.net>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<0vadnQqkdrdQz5nXnZ2dnUVZ_uOdnZ2d@pdx.net>
Message-ID: <gu1t96$st$2@ger.gmane.org>

Scott David Daniels wrote:

> <rant>It would be a bit easier if people would bother to mention
> their Python version, as we regularly get questions from people
> running 2.3, 2.4, 2.5, 2.6, 2.7a, 3.0, and 3.1b.  They run computers
> with differing operating systems and versions such as: Windows 2000,
> OS/X Leopard, ubuntu Hardy Heron, SuSE, ....

And if they copy and paste the actual error messages instead of saying 
'It doesn't work'



From tjreedy at udel.edu  Fri May  8 14:25:15 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 08 May 2009 14:25:15 -0400
Subject: import overwrites __name__
In-Reply-To: <gu1pad$afi$1@ger.gmane.org>
References: <gu1pad$afi$1@ger.gmane.org>
Message-ID: <gu1te9$st$3@ger.gmane.org>

Marco wrote:
> Hi,
> 
> There happened something that I do not understand. Actually I don't even 
> know how it can be possible.
> 
> I import a module and then the name space of the importing module seems do 
> be overwritten.
> 
> my_name = __name__
> print my_name
> print len(dir())
> from x import y as z
> print __name__
> print len(dir())
> print my_name
> 
> ->
> __main__
> 119
> x
> 117
> unhandled NameError "name 'my_name' is not defined"
> 
> The module x is from me, and I am not aware of doing anything cruel there. 
> What evil thing can be done in its sub module that can result in that 
> strange thing?

see responses to "unicode bit me' thread



From walterbyrd at iname.com  Fri May  8 15:03:49 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Fri, 8 May 2009 12:03:49 -0700 (PDT)
Subject: Is there a better way to chose a slice of a list?
Message-ID: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>

This works, but it seems like there should be a better way.

--------------
week = ['sun','mon','tue','wed','thu','fri','sat']
for day in week[week.index('tue'):week.index('fri')]:
   print day
---------------



From caseyhHAMMER_TIME at istar.ca  Fri May  8 15:04:01 2009
From: caseyhHAMMER_TIME at istar.ca (Casey Hawthorne)
Date: Fri, 08 May 2009 12:04:01 -0700
Subject: I'm intrigued that Python has some functional constructions in the
	language.
Message-ID: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>

I'm intrigued that Python has some functional constructions in the
language.

Would it be possible to more clearly separate the pure code (without
side effects) from the impure code (that deals with state changes,
I/O, etc.), so that the pure code could be compiled and have
aggressive functional transformations applied to it for efficiency.

That way, the syntax would be a lot easier to understand, than most
functional languages, like Haskell.

I gave a presentation at the beginning of last year on Haskell and at
the end, someone's comment was, "I can see the benefits of functional
programming but why does it have to be so cryptic."
--
Regards,
Casey


From jcd at sdf.lonestar.org  Fri May  8 15:04:55 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 08 May 2009 15:04:55 -0400
Subject: unicode bit me
In-Reply-To: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
Message-ID: <1241809495.6209.13.camel@aalcdl07>

On Fri, 2009-05-08 at 07:53 -0700, anuraguniyal at yahoo.com wrote:
> #how can I print a list of object which may return unicode
> representation?
> # -*- coding: utf-8 -*-
> 
> class A(object):
> 
>     def __unicode__(self):
>         return u"?au"
> 
>     __str__ = __repr__ = __unicode__
> 

Your __str__ and __repr__ methods don't return strings.  You should
encode your unicode to the encoding you want before you try to print it.

class A(object):
    def __unicode__(self):
        return u"?au"

    def get_utf8_repr(self):
        return self.__unicode__().encode('utf-8')

    def get_koi8_repr(self):
        return self.__unicode__().encode('koi-8')

    __str__ = __repr__ = self.get_utf8_repr

> a = A()
> 
> try:
>     print a # doesn't work?
> except UnicodeEncodeError,e:
>     print e
> try:
>     print unicode(a) # works, ok fine, great
> except UnicodeEncodeError,e:
>     print e
> try:
>     print unicode([a]) # what!!!! doesn't work?
> except UnicodeEncodeError,e:
>     print e
> """
> Now how can I print a list of object which may return unicode
> representation?
> loop/map is not an option as it goes much deepr in my real code
> any can anyoen explain what is happening here under the hood?
> """
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From debatem1 at gmail.com  Fri May  8 16:01:26 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 8 May 2009 13:01:26 -0700 (PDT)
Subject: ECG segmentation
References: <mailman.5305.1241805860.11746.python-list@python.org>
Message-ID: <d8365efd-f154-4676-85d5-1345663c9601@r13g2000vbr.googlegroups.com>

On May 8, 2:04?pm, Filip Gruszczy?ski <grusz... at gmail.com> wrote:
> Hi!
>
> I need to create a script, that performs ECG segmentation, but I can
> hardly find any useful materials on the web. Did anyone try to do this
> and could point me to some good materials/snippets about this?
>
> --
> Filip Gruszczy?ski

How are you looking to do it? If you want an HMM-based solution I'd
recommend <URL: http://ghmm.sourceforge.net/ghmm-python-tutorial.html>.

Geremy Condra


From jcd at sdf.lonestar.org  Fri May  8 16:03:13 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 08 May 2009 16:03:13 -0400
Subject: php to python code converter
In-Reply-To: <4A044D71.1000500@gmail.com>
References: <4A044D71.1000500@gmail.com>
Message-ID: <1241812993.9340.3.camel@aalcdl07>

On Fri, 2009-05-08 at 17:19 +0200, Pascal Chambon wrote:
> PS : Am I the only one having most of answers rejected by the
> antispam 
> system of python-list ? That's humiliating :p
> 

I've had several messages not make it through.

:(




From pruebauno at latinmail.com  Fri May  8 16:22:14 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Fri, 8 May 2009 13:22:14 -0700 (PDT)
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
Message-ID: <51c104f3-4e22-4e3d-a89d-a8133186f3e5@h23g2000vbc.googlegroups.com>

On May 8, 3:03?pm, walterbyrd <walterb... at iname.com> wrote:
> This works, but it seems like there should be a better way.
>
> --------------
> week = ['sun','mon','tue','wed','thu','fri','sat']
> for day in week[week.index('tue'):week.index('fri')]:
> ? ?print day
> ---------------

Depending on the context this style might help:

>>> week = ['sun','mon','tue','wed','thu','fri','sat']
>>> tue_fri = slice(week.index('tue'), week.index('fri'))
>>> for day in week[tue_fri]:
	print day

But I don't really see it as an improvement unless you are using those
intervals repeatedly.


From pruebauno at latinmail.com  Fri May  8 16:28:44 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Fri, 8 May 2009 13:28:44 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
Message-ID: <17b230fc-71e2-4a38-8136-e5aa984aff81@o14g2000vbo.googlegroups.com>

On May 8, 3:04?pm, Casey Hawthorne <caseyhHAMMER_T... at istar.ca> wrote:
> I'm intrigued that Python has some functional constructions in the
> language.
>
> Would it be possible to more clearly separate the pure code (without
> side effects) from the impure code (that deals with state changes,
> I/O, etc.), so that the pure code could be compiled and have
> aggressive functional transformations applied to it for efficiency.
>
> That way, the syntax would be a lot easier to understand, than most
> functional languages, like Haskell.
>
> I gave a presentation at the beginning of last year on Haskell and at
> the end, someone's comment was, "I can see the benefits of functional
> programming but why does it have to be so cryptic."
> --
> Regards,
> Casey

Don't forget that the Python interpreter is simple. It makes
maintenance easier and allows embedding it into other programs. Good
optimizing compilers for functional languages are not simple. Your
idea would be something that could be added to the PyPy project in the
future.


From pavlovevidence at gmail.com  Fri May  8 16:34:03 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 8 May 2009 13:34:03 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
Message-ID: <44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>

On May 8, 12:04?pm, Casey Hawthorne <caseyhHAMMER_T... at istar.ca>
wrote:
> I'm intrigued that Python has some functional constructions in the
> language.
>
> Would it be possible to more clearly separate the pure code (without
> side effects) from the impure code (that deals with state changes,
> I/O, etc.), so that the pure code could be compiled and have
> aggressive functional transformations applied to it for efficiency.

No not really, at least not in any way that it maintains compatibility
with Python.

Python does either expose or mimic the parsing process to the user, so
you could maybe exploit it to get parse trees of functions (checking
that there is nothing that has side-effects) to feed to a specialized
optimizer, but if you do that it might as well be a new langauge.


> That way, the syntax would be a lot easier to understand, than most
> functional languages, like Haskell.
>
> I gave a presentation at the beginning of last year on Haskell and at
> the end, someone's comment was, "I can see the benefits of functional
> programming but why does it have to be so cryptic."

A couple thoughts:

1. It's just one person's opinion.
2. However, functional programming is cryptic at some level no matter
how nice you make the syntax.


Carl Banks


From marco.mandl at gmx.at  Fri May  8 16:35:26 2009
From: marco.mandl at gmx.at (Marco)
Date: Fri, 08 May 2009 22:35:26 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org> <gu1te9$st$3@ger.gmane.org>
Message-ID: <gu252e$rjl$1@ger.gmane.org>

Terry Reedy wrote:

> Marco wrote:
>> Hi,
>> 
>> There happened something that I do not understand. Actually I don't even
>> know how it can be possible.
>> 
>> I import a module and then the name space of the importing module seems
>> do be overwritten.
>> 
>> my_name = __name__
>> print my_name
>> print len(dir())
>> from x import y as z
>> print __name__
>> print len(dir())
>> print my_name
>> 
>> ->
>> __main__
>> 119
>> x
>> 117
>> unhandled NameError "name 'my_name' is not defined"
>> 
>> The module x is from me, and I am not aware of doing anything cruel
>> there. What evil thing can be done in its sub module that can result in
>> that strange thing?
> 
> see responses to "unicode bit me' thread

Therry,

What shall I find there?





From ericgparker at gmail.com  Fri May  8 16:45:11 2009
From: ericgparker at gmail.com (hellcats)
Date: Fri, 8 May 2009 13:45:11 -0700 (PDT)
Subject: Complete frustration
Message-ID: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>

I have Python2.5 installed on Windows XP. Whenever I double click on a
something.pyw file, IDLE launches and opens something.pyw in the
editor. I would prefer to actually *RUN* the program, not edit it. If
I want to edit it then I'll choose the "Edit with IDLE" context menu.
So I then have to press F5 to get the program to execute. Now I have
my program's windows along with two IDLE windows cluttering my screen
and task bar. WHAT IS GOING ON? I've tried changing the file
association to python.exe, and that works, but just ONCE (even if I
choose "always use the slected program to launch this kind of file").
IDLE may be great and all, but I fricken' don't want to see it every
time I just want to run a python program!!!!!


From namekuseijin at gmail.com  Fri May  8 16:52:48 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 08 May 2009 17:52:48 -0300
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <17b230fc-71e2-4a38-8136-e5aa984aff81@o14g2000vbo.googlegroups.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<17b230fc-71e2-4a38-8136-e5aa984aff81@o14g2000vbo.googlegroups.com>
Message-ID: <gu2633$163q$1@adenine.netfront.net>

pruebauno at latinmail.com escreveu:
> Don't forget that the Python interpreter is simple. It makes
> maintenance easier and allows embedding it into other programs. Good
> optimizing compilers for functional languages are not simple.

Good optimizing compilers are not simple, period.

The python interpreter is not all that simple either.  Have you ever 
taken a look at it?  It's a good bytecode interpreter, not some dumb toy 
interpreter.

-- 
a game sig: http://tinyurl.com/d3rxz9


From namekuseijin at gmail.com  Fri May  8 16:56:17 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 08 May 2009 17:56:17 -0300
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
Message-ID: <gu269i$16if$1@adenine.netfront.net>

Carl Banks escreveu:
> 2. However, functional programming is cryptic at some level no matter
> how nice you make the syntax.

When your program is nothing but function definition and function 
application, syntax is meaningless.

It's kinda like scripting, say, Microsoft Word in either Visual Basic, 
Python, Haskell or whatever:  you're just calling functions provided by 
the host, barely using any syntax or intrinsic language feature anyway. 
  Any language will do just fine.

-- 
a game sig: http://tinyurl.com/d3rxz9


From jeff_barish at earthlink.net  Fri May  8 17:06:02 2009
From: jeff_barish at earthlink.net (Jeffrey Barish)
Date: Fri, 08 May 2009 15:06:02 -0600
Subject: Threads and daemon processes
Message-ID: <gu26rr$23s$1@ger.gmane.org>

I have a program that uses threading.Timer to execute a function after a
delay.  It works fine when I run the program normally, but when I run the
program as a daemon process, I can't find any evidence that the function
ever runs.  Is it the case that daemon processes are not allowed to create
a thread?
-- 
Jeffrey Barish



From google at mrabarnett.plus.com  Fri May  8 17:06:48 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 08 May 2009 22:06:48 +0100
Subject: php to python code converter
In-Reply-To: <1241812993.9340.3.camel@aalcdl07>
References: <4A044D71.1000500@gmail.com> <1241812993.9340.3.camel@aalcdl07>
Message-ID: <4A049EE8.3020003@mrabarnett.plus.com>

J. Cliff Dyer wrote:
> On Fri, 2009-05-08 at 17:19 +0200, Pascal Chambon wrote:
>> PS : Am I the only one having most of answers rejected by the
>> antispam 
>> system of python-list ? That's humiliating :p
>>
> 
> I've had several messages not make it through.
> 
> :(
> 
Same here ("Message has a suspicious header").


From marco.mandl at gmx.at  Fri May  8 17:15:00 2009
From: marco.mandl at gmx.at (Marco)
Date: Fri, 08 May 2009 23:15 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org>
Message-ID: <gu27cl$3kg$1@ger.gmane.org>

Marco wrote:

> Hi,
> 
> There happened something that I do not understand. Actually I don't even
> know how it can be possible.
> 
> I import a module and then the name space of the importing module seems do
> be overwritten.
> 
> my_name = __name__
> print my_name
> print len(dir())
> from x import y as z
> print __name__
> print len(dir())
> print my_name
> 
> ->
> __main__
> 119
> x
> 117
> unhandled NameError "name 'my_name' is not defined"
> 
> The module x is from me, and I am not aware of doing anything cruel there.
> What evil thing can be done in its sub module that can result in that
> strange thing?


I just discovered the .pyc file for the main module is not created. When I 
delete the old pyc and import the main module from the python shell it works 
fine. But when I start it with "python main_module.py" the .pyc is not 
created and it happens as shown above.

So what leads to the behavior that the .pyc is not created?

br
Marco




From emile at fenx.com  Fri May  8 17:18:44 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 08 May 2009 14:18:44 -0700
Subject: Complete frustration
In-Reply-To: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
Message-ID: <gu27g2$2o7$1@ger.gmane.org>

On 5/8/2009 1:45 PM hellcats said...
> I have Python2.5 installed on Windows XP. Whenever I double click on a
> something.pyw file, IDLE launches and opens something.pyw in the
> editor. I would prefer to actually *RUN* the program, not edit it. If
> I want to edit it then I'll choose the "Edit with IDLE" context menu.
> So I then have to press F5 to get the program to execute. Now I have
> my program's windows along with two IDLE windows cluttering my screen
> and task bar. WHAT IS GOING ON? I've tried changing the file
> association to python.exe, and that works, but just ONCE (even if I
> choose "always use the slected program to launch this kind of file").
> IDLE may be great and all, but I fricken' don't want to see it every
> time I just want to run a python program!!!!!
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
This is a windows question -- you'll need to reassign the default 
association of PYW files.  Look in explorer|tools|folder options.

Emile



From piet at cs.uu.nl  Fri May  8 17:22:26 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 08 May 2009 23:22:26 +0200
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
Message-ID: <m2eiuzi92l.fsf@cs.uu.nl>

>>>>> "J. Cliff Dyer" <jcd at sdf.lonestar.org> (JCD) a ?crit:

>JCD> On Fri, 2009-05-08 at 07:53 -0700, anuraguniyal at yahoo.com wrote:
>>> #how can I print a list of object which may return unicode
>>> representation?
>>> # -*- coding: utf-8 -*-
>>> 
>>> class A(object):
>>> 
>>> def __unicode__(self):
>>> return u"?au"
>>> 
>>> __str__ = __repr__ = __unicode__
>>> 

>JCD> Your __str__ and __repr__ methods don't return strings.  You should
>JCD> encode your unicode to the encoding you want before you try to print it.

>JCD> class A(object):
>JCD>     def __unicode__(self):
>JCD>         return u"?au"

>JCD>     def get_utf8_repr(self):
>JCD>         return self.__unicode__().encode('utf-8')

>JCD>     def get_koi8_repr(self):
>JCD>         return self.__unicode__().encode('koi-8')

>JCD>     __str__ = __repr__ = self.get_utf8_repr

It might be nicer to have a method that specifies the encoding to be
used in order to make switching encodings easier:

*untested code*

class A(object):
    def __unicode__(self):
        return u"?au"

    def set_encoding(self, encoding):
        self._encoding = encoding

    def __repr__(self):
        return self.__unicode__().encode(self._encoding)

    __str__ = __repr__

Of course this feels very wrong because the encoding should be chosen when
the string goes to the output channel, i.e. outside of the object.
Unfortunately this is one of the leftovers from Python's pre-unicode
heritage. Hopefully in Python3 this will work without problems. Anyway,
in Python 3 the string type is unicode, so at least __repr__ can return
unicode. 
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From apt.shansen at gmail.com  Fri May  8 17:25:45 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 8 May 2009 14:25:45 -0700
Subject: import overwrites __name__
In-Reply-To: <gu27cl$3kg$1@ger.gmane.org>
References: <gu1pad$afi$1@ger.gmane.org> <gu27cl$3kg$1@ger.gmane.org>
Message-ID: <7a9c25c20905081425n15a34acetf25cb6f2e7cbdad6@mail.gmail.com>

>
>  So what leads to the behavior that the .pyc is not created?
>

PYC's are only generated on import, they're never made for the main script.

I personally like to keep my 'main script' very small. Largely just
something which imports other modules and sends them along on their
business.

--S
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From marco.mandl at gmx.at  Fri May  8 17:37:25 2009
From: marco.mandl at gmx.at (Marco)
Date: Fri, 08 May 2009 23:37:25 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org> <gu27cl$3kg$1@ger.gmane.org>
	<7a9c25c20905081425n15a34acetf25cb6f2e7cbdad6@mail.gmail.com>
Message-ID: <gu28ml$6j7$1@ger.gmane.org>

Stephen Hansen wrote:

>>
>>  So what leads to the behavior that the .pyc is not created?
>>
> 
> PYC's are only generated on import, they're never made for the main
> script.
> 
> I personally like to keep my 'main script' very small. Largely just
> something which imports other modules and sends them along on their
> business.

Thanks Stephen,

I just learned that. But still I don't know why there is a different 
(correct) behavior when the main module is compiled.

As a work-around I put this on top of my main script:

import py_compile
py_compile.compile(__file__)

Still I appreciate if someone could explain me why.

br
Marco 




From ldo at geek-central.gen.new_zealand  Fri May  8 17:48:58 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 09 May 2009 09:48:58 +1200
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
Message-ID: <gu29cb$8gg$1@lust.ihug.co.nz>

In message <gu269i$16if$1 at adenine.netfront.net>, namekuseijin wrote:

> Carl Banks escreveu:
>
>> 2. However, functional programming is cryptic at some level no matter
>> how nice you make the syntax.
> 
> When your program is nothing but function definition and function
> application, syntax is meaningless.

On the contrary, syntax is vital to the correct interpretation of functional constructs. See, for example, 
<http://mail.python.org/pipermail/python-list/2008-October/683816.html>.



From apt.shansen at gmail.com  Fri May  8 18:08:03 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 8 May 2009 15:08:03 -0700
Subject: import overwrites __name__
In-Reply-To: <gu28ml$6j7$1@ger.gmane.org>
References: <gu1pad$afi$1@ger.gmane.org> <gu27cl$3kg$1@ger.gmane.org> 
	<7a9c25c20905081425n15a34acetf25cb6f2e7cbdad6@mail.gmail.com> 
	<gu28ml$6j7$1@ger.gmane.org>
Message-ID: <7a9c25c20905081508rdf944c6mf7eb15592ea4ec24@mail.gmail.com>

>
>
> Still I appreciate if someone could explain me why.
>

We can't without seeing the code. There shouldn't be any difference, so if
there is then its because your code is doing something to cause it-- break
it down to a runnable example and we may be able to tell you why, giving us
real code and real errors / output. When you distill it into a pseudocode
explanation of what you're doing and ask why it doesn't work, quite often
what you end up doing is unintentionally leaving out the cause.

E.g., I made two files;

main.py
    my_name = __name__
    print my_name
    print len(dir())
    from other import y as z
    print __name__
    print len(dir())
    print my_name
other.py:
    y = True

And the output is -- no matter if there's a pyc or not -- always:
    __main__
    5
    __main__
    6
    __main__

There's nothing in default/standard Python which is causing this behavior--
Python doesn't run code differently based on if there's a pyc or not or if
its generating a pyc or not, not by itself. You have to be doing something
which is goofying up the interpreter somewhere. Not sure what, but it has to
be in that 'x' you're importing from :)

--S
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From ericgparker at gmail.com  Fri May  8 18:08:16 2009
From: ericgparker at gmail.com (hellcats)
Date: Fri, 8 May 2009 15:08:16 -0700 (PDT)
Subject: Complete frustration
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
	<mailman.5316.1241817430.11746.python-list@python.org>
Message-ID: <0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>

On May 8, 4:18?pm, Emile van Sebille <em... at fenx.com> wrote:
> On 5/8/2009 1:45 PM hellcats said...> I have Python2.5 installed on Windows XP. Whenever I double click on a
> > something.pyw file, IDLE launches and opens something.pyw in the
> > editor. I would prefer to actually *RUN* the program, not edit it. If
> > I want to edit it then I'll choose the "Edit with IDLE" context menu.
> > So I then have to press F5 to get the program to execute. Now I have
> > my program's windows along with two IDLE windows cluttering my screen
> > and task bar. WHAT IS GOING ON? I've tried changing the file
> > association to python.exe, and that works, but just ONCE (even if I
> > choose "always use the slected program to launch this kind of file").
> > IDLE may be great and all, but I fricken' don't want to see it every
> > time I just want to run a python program!!!!!
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> This is a windows question -- you'll need to reassign the default
> association of PYW files. ?Look in explorer|tools|folder options.
>
> Emile

I know that. I've tried reassigning it from pythonw.exe to python.exe,
and like I said, it will work for one invocation. But it seems to
revert back the next time I double click. But also, what is wrong with
it being pythonw.exe? Why does pythonw.exe open up IDLE?


From pavlovevidence at gmail.com  Fri May  8 18:22:04 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 8 May 2009 15:22:04 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
Message-ID: <cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>

On May 8, 1:56?pm, namekuseijin <namekusei... at gmail.com> wrote:
> Carl Banks escreveu:
>
> > 2. However, functional programming is cryptic at some level no matter
> > how nice you make the syntax.
>
> When your program is nothing but function definition and function
> application, syntax is meaningless.

For mere function application you could maybe argue that (and it'd be
a stretch), but there is no reasonable way to claim that syntax is
meaningless for defining functions.  Unless you meant "function
declaration", and I think you did because you don't seem to know what
functional programming is.

> It's kinda like scripting, say, Microsoft Word in either Visual Basic,
> Python, Haskell or whatever:

No it's nothing like that at all.

> ?you're just calling functions provided by
> the host,

That's not what functional programming means, nor is it remotely
comparable to functional programming.

> barely using any syntax or intrinsic language feature anyway.
> ? Any language will do just fine.

Well, that's not true since I found it to be quite a different
experience to invoke Microsoft library functions  in JScript than in
Visual Basic.  (Mostly because it's a PITA even to "barely use any
syntax or intrinsic language feature" of Visual Basic.)

However, that has nothing to do with functional programming.


Carl Banks


From usenet at janc.invalid  Fri May  8 18:24:54 2009
From: usenet at janc.invalid (JanC)
Date: Fri, 8 May 2009 22:24:54 +0000 (UTC)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
	<bea7d12e-2bda-4ec6-868b-440b79bd28e4@21g2000vbk.googlegroups.com>
	<mailman.5014.1241386734.11746.python-list@python.org>
Message-ID: <gu2bfm$jgu$1@news.motzarella.org>

Gabriel Genellina wrote:

> In addition, the zip file format stores the directory at the end of the  
> file. So you can't process it until it's completely downloaded.  

Well, you *can* download the directory part first (if the HTTP server
supports it), and if you only need some files, you could then only
download these files out of the .zip, saving a lot in download time...


-- 
JanC



From emile at fenx.com  Fri May  8 18:36:17 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 08 May 2009 15:36:17 -0700
Subject: Complete frustration
In-Reply-To: <0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>	<mailman.5316.1241817430.11746.python-list@python.org>
	<0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>
Message-ID: <gu2c1h$f0j$1@ger.gmane.org>

On 5/8/2009 3:08 PM hellcats said...
> On May 8, 4:18 pm, Emile van Sebille <em... at fenx.com> wrote:
<snip>
>> This is a windows question -- you'll need to reassign the default
>> association of PYW files.  Look in explorer|tools|folder options.
>>
>> Emile
> 
> I know that. I've tried reassigning it from pythonw.exe to python.exe,
> and like I said, it will work for one invocation. But it seems to
> revert back the next time I double click. But also, what is wrong with
> it being pythonw.exe? Why does pythonw.exe open up IDLE?

When you right click your source file, do you have an 'open with' python 
option?  Does that do the right thing?  If so, you're fighting your 
windows installation which is where you'll need to address this problem.

You might try downloading and installing the activestate python 
distribution (assuming you're not already there).  That will likely set 
your windows registry appropriately.

Emile



From Scott.Daniels at Acm.Org  Fri May  8 18:37:09 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 15:37:09 -0700
Subject: Complete frustration
In-Reply-To: <0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
	<mailman.5316.1241817430.11746.python-list@python.org>
	<0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>
Message-ID: <RcmdnbInS6h5L5nXnZ2dnUVZ_h-dnZ2d@pdx.net>

hellcats wrote:
> On May 8, 4:18 pm, Emile van Sebille <em... at fenx.com> wrote:
>> On 5/8/2009 1:45 PM hellcats said...> I have Python2.5 installed on Windows XP. Whenever I double click on a
>>> something.pyw file, IDLE launches and opens something.pyw in the
>>> editor. I would prefer to actually *RUN* the program, not edit it. If
>>> I want to edit it then I'll choose the "Edit with IDLE" context menu.
>>> So I then have to press F5 to get the program to execute. Now I have
>>> my program's windows along with two IDLE windows cluttering my screen
>>> and task bar. WHAT IS GOING ON? I've tried changing the file
>>> association to python.exe, and that works, but just ONCE (even if I
>>> choose "always use the slected program to launch this kind of file").
>>> IDLE may be great and all, but I fricken' don't want to see it every
>>> time I just want to run a python program!!!!!
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>> This is a windows question -- you'll need to reassign the default
>> association of PYW files.  Look in explorer|tools|folder options.
>>
>> Emile
> 
> I know that. I've tried reassigning it from pythonw.exe to python.exe,
> and like I said, it will work for one invocation. But it seems to
> revert back the next time I double click. But also, what is wrong with
> it being pythonw.exe? Why does pythonw.exe open up IDLE?

Try opening up a command window, and determine the current associations.
If I do this on mine:
     C:\Projects> assoc .pyw
     .pyw=Python.NoConFile

     C:\Projects> ftype Python.NoConFile
     Python.NoConFile="C:\Python31\pythonw.exe" "%1" %*

It is possible you installed something that switched those settings.

--Scott David Daniels
Scott.Daniels at Acm.Org


From caseyhHAMMER_TIME at istar.ca  Fri May  8 18:59:28 2009
From: caseyhHAMMER_TIME at istar.ca (Casey Hawthorne)
Date: Fri, 08 May 2009 15:59:28 -0700
Subject: Complete frustration
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
	<mailman.5316.1241817430.11746.python-list@python.org>
Message-ID: <99e905to9s933pa6lpap31mn4mmdgks763@4ax.com>

On Fri, 08 May 2009 14:18:44 -0700, Emile van Sebille <emile at fenx.com>
wrote:

>On 5/8/2009 1:45 PM hellcats said...
>> I have Python2.5 installed on Windows XP. Whenever I double click on a
>> something.pyw file, IDLE launches and opens something.pyw in the
>> editor. I would prefer to actually *RUN* the program, not edit it. If
>> I want to edit it then I'll choose the "Edit with IDLE" context menu.
>> So I then have to press F5 to get the program to execute. Now I have
>> my program's windows along with two IDLE windows cluttering my screen
>> and task bar. WHAT IS GOING ON? I've tried changing the file
>> association to python.exe, and that works, but just ONCE (even if I
>> choose "always use the slected program to launch this kind of file").
>> IDLE may be great and all, but I fricken' don't want to see it every
>> time I just want to run a python program!!!!!
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>> 
>This is a windows question -- you'll need to reassign the default 
>association of PYW files.  Look in explorer|tools|folder options.
>
>Emile

I believe this option is in the Python init file!
--
Regards,
Casey


From zondo42 at googlemail.com  Fri May  8 19:16:35 2009
From: zondo42 at googlemail.com (Glenn Hutchings)
Date: Sat, 09 May 2009 00:16:35 +0100
Subject: import overwrites __name__
References: <mailman.5301.1241803210.11746.python-list@python.org>
Message-ID: <pan.2009.05.08.23.16.34.990609@googlemail.com>

On Fri, 08 May 2009 19:14:52 +0200, Marco wrote:

> I import a module and then the name space of the importing module seems do 
> be overwritten.
> 
> my_name = __name__
> print my_name
> print len(dir())
> from x import y as z
> print __name__
> print len(dir())
> print my_name
> 
> ->
> __main__
> 119
> x
> 117
> unhandled NameError "name 'my_name' is not defined"

Interesting.  Here's one possibility for the contents of module x.py:

import sys
del sys.modules['__main__'].my_name
y = 42

I can't think of any other way apart from grovelling through sys.modules.

Glenn


From ericgparker at gmail.com  Fri May  8 19:20:52 2009
From: ericgparker at gmail.com (hellcats)
Date: Fri, 8 May 2009 16:20:52 -0700 (PDT)
Subject: Complete frustration
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
	<mailman.5316.1241817430.11746.python-list@python.org>
	<0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>
	<mailman.5320.1241822076.11746.python-list@python.org>
Message-ID: <83ebb5c0-4381-4905-a245-a18ce1c6c33a@s16g2000vbp.googlegroups.com>

On May 8, 5:36?pm, Emile van Sebille <em... at fenx.com> wrote:
> On 5/8/2009 3:08 PM hellcats said...
>
> > On May 8, 4:18 pm, Emile van Sebille <em... at fenx.com> wrote:
> <snip>
> >> This is a windows question -- you'll need to reassign the default
> >> association of PYW files. ?Look in explorer|tools|folder options.
>
> >> Emile
>
> > I know that. I've tried reassigning it from pythonw.exe to python.exe,
> > and like I said, it will work for one invocation. But it seems to
> > revert back the next time I double click. But also, what is wrong with
> > it being pythonw.exe? Why does pythonw.exe open up IDLE?
>
> When you right click your source file, do you have an 'open with' python
> option? ?Does that do the right thing? ?If so, you're fighting your
> windows installation which is where you'll need to address this problem.
>
> You might try downloading and installing the activestate python
> distribution (assuming you're not already there). ?That will likely set
> your windows registry appropriately.
>
> Emile

Thanks everyone for the suggestions. I played with the registry a
little bit. It looks like I had Python2.6 installed at one point, so
maybe that corrupted things. I uninstalled everything and reinstalled
Python2.5 (but without Tk/Tcl) and now double clicking a .pyw runs the
program without IDLE or the MSDOS window showing up (as I had hoped).
So I am happy now. Thanks again.


From denis.papathanasiou at gmail.com  Fri May  8 19:36:06 2009
From: denis.papathanasiou at gmail.com (dpapathanasiou)
Date: Fri, 8 May 2009 16:36:06 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
Message-ID: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>

I wrote a python script called xml_utils.py which parses xml using
minidom.

It works when it's run on its own, but when I try to import it and run
it inside a mod_python handler, I get this error:

  File "../common/xml_utils.py", line 80, in parse_item_attribute
  File "/usr/lib/python2.5/xml/dom/minidom.py", line 1924, in
parseString
    from xml.dom import expatbuilder
SystemError: Parent module 'xml.dom' not loaded

Basically, it's the same problem I found in this post:
http://mail.python.org/pipermail/python-list/2007-January/424018.html

This site (http://www.dscpl.com.au/wiki/ModPython/Articles/
ExpatCausingApacheCrash) goes through a detailed explanation, and I
found that the version of pyexpat is newer than libexpat:

# ldd /usr/local/apache2/bin/httpd | grep expat
	libexpat.so.0 => /usr/local/apache2/lib/libexpat.so.0 (0xb7f71000)
# strings /usr/local/apache2/lib/libexpat.so.0 | grep expat_
expat_1.95.2

$ python
Python 2.5.2 (r252:60911, Jan  4 2009, 17:40:26)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyexpat
>>> pyexpat.version_info
(2, 0, 0)

But this is where I'm stuck: the article suggests recompiling apache
with the newer version of expat.

Apache's configure utility (I'm using httpd version 2.2.11) doesn't
explicitly describe an expat library option.

Also, if libexpat is version 1.95.2, wouldn't I have to get version
2.0 to be compatible with pyexpat?

If anyone has any advice or suggestions, I'd appreciate hearing them.


From gallium.arsenide at gmail.com  Fri May  8 19:55:39 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Fri, 8 May 2009 16:55:39 -0700 (PDT)
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
Message-ID: <6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>

On May 8, 3:03?pm, walterbyrd <walterb... at iname.com> wrote:
> This works, but it seems like there should be a better way.
>
> --------------
> week = ['sun','mon','tue','wed','thu','fri','sat']
> for day in week[week.index('tue'):week.index('fri')]:
> ? ?print day
> ---------------

I think you should provide much more information, primarily why you
want to do this.  What is the larger goal you are trying to achieve?

In the absence of further information, it seems to me that you are
trying to create an enumerated type.  For various ideas to achieve
this simply, depending on your purpose, see

  http://norvig.com/python-iaq.html

If you want a more thorough treatment, maybe try this package:

  http://pypi.python.org/pypi/enum/

There may be other recipes and packages; you can Google for them using
keywords "python enum" or similar.

John


From emile at fenx.com  Fri May  8 20:03:34 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 08 May 2009 17:03:34 -0700
Subject: Complete frustration
In-Reply-To: <99e905to9s933pa6lpap31mn4mmdgks763@4ax.com>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>	<mailman.5316.1241817430.11746.python-list@python.org>
	<99e905to9s933pa6lpap31mn4mmdgks763@4ax.com>
Message-ID: <gu2h55$p68$1@ger.gmane.org>

On 5/8/2009 3:59 PM Casey Hawthorne said...
> On Fri, 08 May 2009 14:18:44 -0700, Emile van Sebille <emile at fenx.com>
<snip>
>> This is a windows question -- you'll need to reassign the default 
>> association of PYW files.  Look in explorer|tools|folder options.
>>
>> Emile
> 
> I believe this option is in the Python init file!

As in part of site?  Such that invoking "python.exe myfile.py" turns it 
around and invokes idle myfile.py?

Who knew?  :)

Emile



From namekuseijin at gmail.com  Fri May  8 20:16:35 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 8 May 2009 17:16:35 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net> <gu29cb$8gg$1@lust.ihug.co.nz>
Message-ID: <692b7ae8-0c5b-498a-a012-51bda980f3b9@s28g2000vbp.googlegroups.com>

On May 8, 6:48?pm, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <gu269i$16i... at adenine.netfront.net>, namekuseijin wrote:
>
> > Carl Banks escreveu:
>
> >> 2. However, functional programming is cryptic at some level no matter
> >> how nice you make the syntax.
>
> > When your program is nothing but function definition and function
> > application, syntax is meaningless.
>
> On the contrary, syntax is vital to the correct interpretation of functional constructs. See, for example,
> <http://mail.python.org/pipermail/python-list/2008-October/683816.html>.

Yeah, it's important in an imperative language to have predefined
syntax to allow you to do things.  Point taken.


From steve at REMOVE-THIS-cybersource.com.au  Fri May  8 20:28:34 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 00:28:34 GMT
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
	<mailman.5234.1241721664.11746.python-list@python.org>
Message-ID: <0214c170$0$20647$c3e8da3@news.astraweb.com>

On Thu, 07 May 2009 11:40:57 -0700, Chris Rebert wrote:

>> why is the printed result of
>>
>>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>>> print(basket)
>> {'orange', 'banana', 'pear', 'apple'}
>>
>> in the sequence given?
> 
> Because it's *not a sequence* at all, it's a set. 

[pedant]

But the *printed output* is a sequence. It's a sequence of characters. 
The OP doesn't claim that basket is a sequence-type, he is using 
"sequence" in a generic, plain English way.

[/pedant]

I agree with the rest of your explanation about arbitrary ordering of 
sets :)



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Fri May  8 20:30:40 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 08 May 2009 21:30:40 -0300
Subject: Threads and daemon processes
References: <gu26rr$23s$1@ger.gmane.org>
Message-ID: <op.utmzpei1x6zn5v@lepton.softlabbsas.com.ar>

En Fri, 08 May 2009 18:06:02 -0300, Jeffrey Barish  
<jeff_barish at earthlink.net> escribi?:

> I have a program that uses threading.Timer to execute a function after a
> delay.  It works fine when I run the program normally, but when I run the
> program as a daemon process, I can't find any evidence that the function
> ever runs.  Is it the case that daemon processes are not allowed to  
> create a thread?

Try redirecting stdout/stderr to some log file; maybe your daemon dies due  
to some error.

-- 
Gabriel Genellina



From socyl at 987jk.com.invalid  Fri May  8 20:35:03 2009
From: socyl at 987jk.com.invalid (kj)
Date: Sat, 9 May 2009 00:35:03 +0000 (UTC)
Subject: ISO exemplary Python scripts
Message-ID: <gu2j3n$a90$1@reader1.panix.com>



I'm learning python, for the umpteenth time.  This time I decided
to start out by writing Python scripts for everyday tasks.  Most
of these scripts are meant to be used only once or twice, but a
few of them have become useful enough that I'd like to make them
a little bit more solid...

I'd like to learn from well-written Python scripts, with well-structured
options parsing, good error and help messages, clear organization,
etc.

Can someone point me to good examples of Python scripts?

TIA!

kynnjo

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From Scott.Daniels at Acm.Org  Fri May  8 20:35:34 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 17:35:34 -0700
Subject: import overwrites __name__
In-Reply-To: <pan.2009.05.08.23.16.34.990609@googlemail.com>
References: <mailman.5301.1241803210.11746.python-list@python.org>
	<pan.2009.05.08.23.16.34.990609@googlemail.com>
Message-ID: <YI2dnX1yock-U5nXnZ2dnUVZ_rOdnZ2d@pdx.net>

Glenn Hutchings wrote:
> On Fri, 08 May 2009 19:14:52 +0200, Marco wrote:
> 
>> I import a module and then the name space of the importing module seems do 
>> be overwritten.
>>
>> my_name = __name__
>> print my_name
>> print len(dir())
>> from x import y as z
>> print __name__
>> print len(dir())
>> print my_name
>>
>> ->
>> __main__
>> 119
>> x
>> 117
>> unhandled NameError "name 'my_name' is not defined"
> 
> Interesting.  Here's one possibility for the contents of module x.py:
> 
> import sys
> del sys.modules['__main__'].my_name
> y = 42
> 
> I can't think of any other way apart from grovelling through sys.modules.

OK, here's one way to see more detail:
     import sys
     my_name = __name__
     pre = set(sys.modules), set(dir())
     from x import y as z
     post = set(sys.modules), set(dir())
     print 'Modules added: %s, removed: %s' % (
                post[0] - pre[0], pre[0] - post[0])
     print 'Globals added: %s, removed: %s' % (
                post[1] - pre[1], pre[1] - post[1])

--Scott David Daniels
Scott.Daniels at Acm.Org


From Scott.Daniels at Acm.Org  Fri May  8 20:39:33 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 17:39:33 -0700
Subject: Complete frustration
In-Reply-To: <83ebb5c0-4381-4905-a245-a18ce1c6c33a@s16g2000vbp.googlegroups.com>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
	<mailman.5316.1241817430.11746.python-list@python.org>
	<0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>
	<mailman.5320.1241822076.11746.python-list@python.org>
	<83ebb5c0-4381-4905-a245-a18ce1c6c33a@s16g2000vbp.googlegroups.com>
Message-ID: <Hv2dnWJTiOoPUpnXnZ2dnUVZ_vudnZ2d@pdx.net>

hellcats wrote:
> On May 8, 5:36 pm, Emile van Sebille <em... at fenx.com> wrote:
>> On 5/8/2009 3:08 PM hellcats said...
>>
>>> On May 8, 4:18 pm, Emile van Sebille <em... at fenx.com> wrote:
>> <snip>
>>>> This is a windows question -- you'll need to reassign the default
>>>> association of PYW files.  Look in explorer|tools|folder options.
>>>> Emile
>>> I know that. I've tried reassigning it from pythonw.exe to python.exe,
>>> and like I said, it will work for one invocation. But it seems to
>>> revert back the next time I double click. But also, what is wrong with
>>> it being pythonw.exe? Why does pythonw.exe open up IDLE?
>> When you right click your source file, do you have an 'open with' python
>> option?  Does that do the right thing?  If so, you're fighting your
>> windows installation which is where you'll need to address this problem.
>>
>> You might try downloading and installing the activestate python
>> distribution (assuming you're not already there).  That will likely set
>> your windows registry appropriately.
>>
>> Emile
> 
> Thanks everyone for the suggestions. I played with the registry a
> little bit. It looks like I had Python2.6 installed at one point, so
> maybe that corrupted things. I uninstalled everything and reinstalled
> Python2.5 (but without Tk/Tcl) and now double clicking a .pyw runs the
> program without IDLE or the MSDOS window showing up (as I had hoped).
> So I am happy now. Thanks again.

You probably can have Tk/Tcl there, I suspect something like VPython
or the 2.6 and remove it caused the problem.  By the way, it is safe
to simply uninstall-reinstall a python .msi in order to make that
version of python be the default.  uninstalling only removes that
which it installs, so after a reinstall, your other libraries are
still safely there.

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at REMOVE-THIS-cybersource.com.au  Fri May  8 20:39:37 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 00:39:37 GMT
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5109.1241543371.11746.python-list@python.org>
	<85d4am8hq4.fsf@agentultra.com>
	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
	<8563gcx1p1.fsf@agentultra.com>
Message-ID: <0214c407$0$20647$c3e8da3@news.astraweb.com>

On Thu, 07 May 2009 13:28:10 -0400, J Kenneth King wrote:

> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
> 
>> On Wed, 06 May 2009 09:48:51 -0400, J Kenneth King wrote:
>>
>>> Emile van Sebille <emile at fenx.com> writes:
>>> 
>>>> On 5/5/2009 9:15 AM J Kenneth King said...
>>>>
>>>>> List comprehensions can make a reader of your code apprehensive
>>>>> because it can read like a run-on sentence and thus be difficult to
>>>>> parse. The Python documentation discourages their use and I believe
>>>>> for good reason.
>>>>
>>>> Can you provide a link for this?  I'd like to see specifically what's
>>>> being discouraged, as I'd be surprised to find routine usage frowned
>>>> upon.
>>>>
>>>> Emile
>>> 
>>> http://docs.python.org/tutorial/datastructures.html#nested-list-
>> comprehensions
>>> 
>>> 
>>> "If you?ve got the stomach for it, list comprehensions can be nested.
>>> They are a powerful tool but ? like all powerful tools ? they need to
>>> be used carefully, if at all."
>>
>> How does this discourage the use of list comprehensions? At most, it
>> warns that complicated list comps are tricky. Complicated *anything*
>> are tricky.
> 
> They are tricky and need to be used carefully, *if at all*.
> 
> IMO this means that if there's a way to do it without a nested list
> comprehension, then that solution should be preferred.

Earlier, you claimed that list comps in general were discouraged:

"List comprehensions can make a reader of your code apprehensive because 
it can read like a run-on sentence and thus be difficult to parse. The 
Python documentation discourages their use and I believe for good reason."

Emile said "I'd be surprised to find routine usage frowned upon", giving 
you the opportunity to correct his (mis)understanding. You failed to do 
so, which I took as meaning that you agreed that routine usage of simple 
list comps were frowned upon. Now you're talking about *nested* list 
comps. You started off (apparently) objecting to list comps in general, 
because they "can" make readers apprehensive. Now you seem to be saying 
that it's only the complicated, overly-dense ones which rightly make 
readers apprehensive which you object to.

I suppose we're making progress if we agree that the Python docs warn 
against unnecessarily complicated nested list comps. Whether it 
discourages as well as warns is a matter of interpretation. But there's 
certainly no sign that list comps as a general technique are discouraged 
just because overly-complicated list comps are tricky to read. The same 
can be said about *any* piece of code.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May  8 20:41:08 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 00:41:08 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<f23ebd9d-f445-4ebf-9b87-971d3ab295f6@p4g2000vba.googlegroups.com>
Message-ID: <0214c461$0$20647$c3e8da3@news.astraweb.com>

On Thu, 07 May 2009 08:21:51 -0700, Francis Carr wrote:

> In the special case of a self-recursive function, you would like re-
> naming "to just work".  Out of morbid curiosity, I am compelled to
> ask... why do you expect that re-naming anything --- a function, a
> class, a module, a variable, anything --- in just one place but not all
> the others should ever, under any circumstances, "just work" ?

Patching functions to do pre-processing or post-processing can be a 
useful technique, (e.g. for tracing and debugging). This works for 
regular functions, but not recursive functions.


>>> def listify(x):
...     return [x]
...
>>> listify(42)
[42]
>>>
>>> _old_listify = listify
>>> def listify(x):
...     print "Calling listify"
...     return _old_listify(x)
...
>>> listify(42)
Calling listify
[42]

Note that the call to listify "just works" -- the patch runs once, the 
original version of the function runs once, and we get the expected 
results without any problems.


Now try the same technique on a recursive function, and it fails:

>>> def rec(x):
...     if x > 0: return [x] + rec(x-1)
...     else: return []
...
>>> rec(5)
[5, 4, 3, 2, 1]
>>>
>>> _old_rec = rec
>>> def rec(x):
...     print "Calling rec"
...     return _old_rec(x)
...
>>> rec(5)
Calling rec
Calling rec
Calling rec
Calling rec
Calling rec
Calling rec
[5, 4, 3, 2, 1]

Note too that if you're given an arbitrary function, there's no simple 
way of telling whether it's recursive or not. Properly written "self-
reflective" functions using my proposed technique should be immune to 
this problem.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May  8 20:47:24 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 00:47:24 GMT
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<0vadnQqkdrdQz5nXnZ2dnUVZ_uOdnZ2d@pdx.net>
	<mailman.5308.1241806970.11746.python-list@python.org>
Message-ID: <0214c5da$0$20647$c3e8da3@news.astraweb.com>

On Fri, 08 May 2009 14:22:32 -0400, Terry Reedy wrote:

> Scott David Daniels wrote:
> 
>> <rant>It would be a bit easier if people would bother to mention their
>> Python version, as we regularly get questions from people running 2.3,
>> 2.4, 2.5, 2.6, 2.7a, 3.0, and 3.1b.  They run computers with differing
>> operating systems and versions such as: Windows 2000, OS/X Leopard,
>> ubuntu Hardy Heron, SuSE, ....
> 
> And if they copy and paste the actual error messages instead of saying
> 'It doesn't work'

"I tried to copy and paste the actual error message, but it doesn't 
work..."


*grin*


-- 
Steven


From namekuseijin at gmail.com  Fri May  8 20:47:30 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 8 May 2009 17:47:30 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
Message-ID: <9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>

On May 8, 7:22?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 8, 1:56?pm, namekuseijin <namekusei... at gmail.com> wrote:
> > Carl Banks escreveu:
> > > 2. However, functional programming is cryptic at some level no matter
> > > how nice you make the syntax.
>
> > When your program is nothing but function definition and function
> > application, syntax is meaningless.
>
> For mere function application you could maybe argue that (and it'd be
> a stretch), but there is no reasonable way to claim that syntax is
> meaningless for defining functions. ?Unless you meant "function
> declaration", and I think you did because you don't seem to know what
> functional programming is.
>
> > ?you're just calling functions provided by
> > the host,
>
> That's not what functional programming means, nor is it remotely
> comparable to functional programming.

My point is that when all you do is call functions, syntax is
irrelevant.  You call functions pretty much in the same way regardless
of language:  functionname, optionalOpenPar, parameters,
optionalClosePar.  Office automation is all about calling predefined
functions in the host application, that's all my example was about.

Functional programming is all about defining functions and applying
functions.  Core ML, Haskell and Scheme are all like that, pretty much
an extended lambda calculus.  Haskell provides a bunch of syntatic
sugar, more so than Scheme for instance, but in the end, it all gets
converted into lambda expressions and application of arguments to
lambda expressions.

Python has a bunch of handy predefined syntax, because not everything
can be defined out of functions alone.  Syntax is much more important
here than in true functional programming languages, where pretty much
everything besides basic "if" branching is a "userland" function --
including looping constructs.  I have written my own list
comprehensions and generators in Scheme!

When you read a Haskell or Scheme program, it's truly hard to spot
predefined syntax:  most of it is composable function application.
Once in a while you spot an "if".

> > barely using any syntax or intrinsic language feature anyway.
> > ? Any language will do just fine.
>
> Well, that's not true since I found it to be quite a different
> experience to invoke Microsoft library functions ?in JScript than in
> Visual Basic. ?(Mostly because it's a PITA even to "barely use any
> syntax or intrinsic language feature" of Visual Basic.)

Not quite Word, but here's in OpenOffice scripted either in BeanShell,
JScript and Java:
http://wiki.services.openoffice.org/wiki/Documentation/DevGuide/Scripting/Writing_Macros

oDoc = context.getDocument();
xTextDoc = (XTextDocument) UnoRuntime.queryInterface
(XTextDocument.class,oDoc);
xText = xTextDoc.getText();
xTextRange = xText.getEnd();
xTextRange.setString( "Hello World (in BeanShell)" );

oDoc = XSCRIPTCONTEXT.getDocument();
xTextDoc = UnoRuntime.queryInterface(XTextDocument,oDoc);
xText = xTextDoc.getText();
xTextRange = xText.getEnd();
xTextRange.setString( "Hello World (in JavaScript)" );

XTextDocument xtextdocument = (XTextDocument) UnoRuntime.queryInterface
(
                                               XTextDocument.class,
xDocModel);
XText xText = xtextdocument.getText();
XTextRange xTextRange = xText.getEnd();
xTextRange.setString( "Hello World (in Java)" );

Although this is a bad example because of the closeness of syntax
between the languages, it would not be much different in a completely
alien language.  It would still make a call to get the data model of
the current document, another to get the text, another to get the end
and another to set the string.  It's all function calls, really.

No, it's not functional programming, but it illustrates what I said:
when all you do is call functions, syntax is irrelevant.


From http  Fri May  8 20:49:51 2009
From: http (Paul Rubin)
Date: 08 May 2009 17:49:51 -0700
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
Message-ID: <7x1vqzaymo.fsf@ruckus.brouhaha.com>

Casey Hawthorne <caseyhHAMMER_TIME at istar.ca> writes:
> Would it be possible to more clearly separate the pure code (without
> side effects) from the impure code (that deals with state changes,
> I/O, etc.), so that the pure code could be compiled and have
> aggressive functional transformations applied to it for efficiency.

This doesn't fit Python semantics terribly well.

> That way, the syntax would be a lot easier to understand, than most
> functional languages, like Haskell.

I don't think it would help much, even if it was done (see below).

> I gave a presentation at the beginning of last year on Haskell and at
> the end, someone's comment was, "I can see the benefits of functional
> programming but why does it have to be so cryptic."

Haskell's syntax (like Python's or Lisp's) takes a little getting used
to, but in my experience it's not really cryptic.  IMHO, functional
programming is difficult for imperative programmers to understand at
first, because the concepts in it are really different from what
imperative programmers are generally used to, and that take some head
scratching to make sense of.  Think of a beginning imperative
programmer encountering recursion or coroutines for the first time, or
how someone learning calculus deals with the concepts of limits and
continuity.  These subjects have certain hurdles that require effort
to get past, but which expand the range of problems that someone who
has put in the effort can solve.  Functional programming presents more
such hurdles, and more such expansion.


From steve at REMOVE-THIS-cybersource.com.au  Fri May  8 20:51:46 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 00:51:46 GMT
Subject: Simple programme - Just want to know whether this is correct
	way of coding
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
Message-ID: <0214c6e0$0$20647$c3e8da3@news.astraweb.com>

On Thu, 07 May 2009 23:37:27 -0700, guptha wrote:

> The code Works fine ,but I doubt about the performance issue ,My
> intention is to send mails concurrently to large number of mail. 1.For
> every mail id i send It creates a new SMTP object,in case, if i send to
> 1000 or more ids
>       a) It obliviously creates that much SMPT connections ,is this a
> right approach .

Why do you care? I assume you're running this code on a botnet, so why 
care about performance?

[ha ha only serious]


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May  8 20:52:20 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 00:52:20 GMT
Subject: Why there is a parameter named "self" for classmethod function?
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
	<4A024F18.9080407@kbsymanzik.org>
	<mailman.5206.1241671190.11746.python-list@python.org>
	<pan.2009.05.07.06.29.56@REMOVE.THIS.cybersource.com.au>
	<2c80e8d0-cc44-48b3-8b90-7b165eb20ed4@g20g2000vba.googlegroups.com>
Message-ID: <0214c701$0$20647$c3e8da3@news.astraweb.com>

On Thu, 07 May 2009 04:27:15 -0700, Aaron Brady wrote:

>> Can be, but if there's reason enough to keep it with a class, there's
>> no reason not to.
> 
> That's a bit of hyperbole; the usual reasons such as code bloat,
> namespace bloat, maintainability etc. all weigh against it.  It's just
> that the benefits weigh heavier.

I'm not sure I understand. Whether the function is in the class or 
extracted out into the module, it is exactly the same function. (Apart 
from an extra level of indentation, and either an unused "self" parameter 
or a @staticmethod line.) Same amount of code, same difficulty of 
maintainability. Namespace bloat is also the same, the only difference 
being which namespace is bloated: the class or the method.


-- 
Steven


From pavlovevidence at gmail.com  Fri May  8 21:13:44 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 8 May 2009 18:13:44 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
Message-ID: <7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>

On May 8, 5:47?pm, namekuseijin <namekusei... at gmail.com> wrote:
> My point is that when all you do is call functions, syntax is
> irrelevant. ?You call functions pretty much in the same way regardless
> of language: ?functionname, optionalOpenPar, parameters,
> optionalClosePar.

then...

> Functional programming is all about defining functions and applying
> functions. ?Core ML, Haskell and Scheme are all like that,

Yet all three use a different syntax to call functions, none of them
the "pretty much the same way" you listed above.

Haskell, Python, and (I think) ML can define operators with different
syntax than function calls, that matters.

Haskell and Python have syntax for list operations, that matters.

Haskell nexts using indentation, the others nest using tokens(**),
that matters.

I can go on, but you get the idea.  Point is: functional programmint
isn't "nothing but calling functions".

[snip irrelevant stuff about office scripting]

Carl Banks

(**) Python does using indentation to nest, of course, but not at the
expression level.


From http  Fri May  8 21:36:41 2009
From: http (Paul Rubin)
Date: 08 May 2009 18:36:41 -0700
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
Message-ID: <7xmy9nnjkm.fsf@ruckus.brouhaha.com>

Carl Banks <pavlovevidence at gmail.com> writes:
> I can go on, but you get the idea.  Point is: functional programmint
> isn't "nothing but calling functions".

I would mainly describe functional programming as programming with the
pervasive use of higher order functions.  For example, loops in
functional programming can be implemented using recursion, but in
practice, one doesn't see actual explicit recursion in Haskell code
all that often.  Instead we see wide use of functions like map,
filter, and fold (a/k/a "reduce"), which can take the place of looping
constructs.

Python also has higher-order functions like that, but their use is
disfavored in certain circles.  With Python 3, there has actually been
movement towards removing them from the language.


From namekuseijin at gmail.com  Fri May  8 22:19:21 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 8 May 2009 19:19:21 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com> 
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
Message-ID: <ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>

On May 8, 10:13?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 8, 5:47?pm, namekuseijin <namekusei... at gmail.com> wrote:
>
> > My point is that when all you do is call functions, syntax is
> > irrelevant. ?You call functions pretty much in the same way regardless
> > of language: ?functionname, optionalOpenPar, parameters,
> > optionalClosePar.
>
> then...
>
> > Functional programming is all about defining functions and applying
> > functions. ?Core ML, Haskell and Scheme are all like that,
>
> Yet all three use a different syntax to call functions, none of them
> the "pretty much the same way" you listed above.

It's still functionName arguments AFAIK.  Some using parentheses
around the arguments, some around all, some not using parentheses at
all.

> Haskell and Python have syntax for list operations, that matters.
>
> Haskell nexts using indentation, the others nest using tokens(**),
> that matters.

In Haskell, Lisp and other functional programming languages, any extra
syntax gets converted into the core lambda constructs.  In Lisp
languages, that syntax is merely user-defined macros, but in Haskell
it's builtin the compiler for convenience.

> I can go on, but you get the idea. ?Point is: functional programmint
> isn't "nothing but calling functions".

Oh yes, functional programming is all about function definition and
function calling.  You have a point about higher order functions, but
that's really only useful as far as your lambda expressions are useful
-- that is, conveniently defining anonymous functions on-the-fly and
immediately applying them.


From namekuseijin at gmail.com  Fri May  8 22:22:26 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 8 May 2009 19:22:26 -0700 (PDT)
Subject: Simple programme - Just want to know whether this is correct way 
	of coding
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
Message-ID: <7d44d587-15c7-40ea-abe2-6a174f1fd0cd@q14g2000vbn.googlegroups.com>

On May 8, 3:37?am, guptha <gjango... at gmail.com> wrote:
> The code Works fine ,but I doubt about the performance issue ,My
> intention is to send mails concurrently to large number of mail.
> 1.For every mail id i send It creates a new SMTP object,in case, if i
> send to 1000 or more ids

why should I help a spammer... ;)


From li.wang.d at gmail.com  Fri May  8 22:59:31 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Sat, 9 May 2009 12:59:31 +1000
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <4A049811.9010600@ieee.org>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
	<4A03DE84.40406@ieee.org>
	<11aabe3b0905080208x5df4df5bu4eec2712d842320@mail.gmail.com>
	<4A049811.9010600@ieee.org>
Message-ID: <11aabe3b0905081959x5a0a0c80jde3dc500f9ccda9b@mail.gmail.com>

> (my smtp mail server has been down for a few hours, so you have some other
> responses.)
>
> yes, as far as I can tell from the docs, the 'b' flag doesn't matter in
> Unix/Linux.  Note that I haven't actually been on a Unix machine since
> starting with Python, but it matches what else I know.  And if it's
> different in Python 3.0, I wouldn't know that either.,

Thank you very much!


-- 
Li
------
Time is all we have
and you may find one day
you have less than you think


From apt.shansen at gmail.com  Fri May  8 23:05:10 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 8 May 2009 20:05:10 -0700
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
In-Reply-To: <7xmy9nnjkm.fsf@ruckus.brouhaha.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com> 
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com> 
	<7xmy9nnjkm.fsf@ruckus.brouhaha.com>
Message-ID: <7a9c25c20905082005r7c3e5ec4y57e95a681fe5cba1@mail.gmail.com>

> Python also has higher-order functions like that, but their use is
> disfavored in certain circles.  With Python 3, there has actually been
> movement towards removing them from the language.


... Buh? Reduce was moved to functools, map and filter weren't touched;
there was some discussion before Python 3 was released to remove them in
favor of new Python tools(comprehensions, itertools, and whatever else), but
they decided not to. You can't call that movement; they're now here to stay.
Maybe when Python 4000 comes around Guido might consider it again and not
get talked out of it this that time-- but there's no way that they're going
to be deprecated or removed in the next ten years at this point. It'd be
code-breakage on a massive scale.

Some people don't like them. But there's quite a few Pythoniacs who do and
use them to great effect. Don't make it sound like they're some dangerous
thing which has a looming deprecation over its head so it shouldn't be
bothered with.

--S
-------------- next part --------------
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From ross.jett at gmail.com  Fri May  8 23:17:15 2009
From: ross.jett at gmail.com (Ross)
Date: Fri, 8 May 2009 20:17:15 -0700 (PDT)
Subject: slice iterator?
Message-ID: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>

I have a really long list that I would like segmented into smaller
lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
a way to do this without explicitly defining new lists? If the above
problem were to be split into groups of 3, I've tried something like:

start = 0
stop = 3
for i in range(len(a)):
    segment = a[start:stop]
    print segment
    start += stop
    stop += stop

Unfortunately start and stop don't increment using this code. Ideally,
my outcome would be
[1,2,3]
[4,5,6]
[7,8,9]
[10,11,12]


From http  Fri May  8 23:29:51 2009
From: http (Paul Rubin)
Date: 08 May 2009 20:29:51 -0700
Subject: slice iterator?
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
Message-ID: <7xprejoswg.fsf@ruckus.brouhaha.com>

Ross <ross.jett at gmail.com> writes:
> I have a really long list that I would like segmented into smaller
> lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> a way to do this without explicitly defining new lists? 

That question comes up so often it should probably be a standard
library function.

Anyway, here is an iterator, if that's what you want:

   >>> from itertools import islice
   >>> a = range(12)
   >>> xs = iter(lambda x=iter(a): list(islice(x,3)), [])
   >>> print list(xs)
   [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10, 11]]

Of course, as the saying goes, there's more than one way to do it ;-)


From davea at ieee.org  Fri May  8 23:45:46 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 08 May 2009 23:45:46 -0400
Subject: import overwrites __name__
In-Reply-To: <gu27cl$3kg$1@ger.gmane.org>
References: <gu1pad$afi$1@ger.gmane.org> <gu27cl$3kg$1@ger.gmane.org>
Message-ID: <4A04FC6A.3020802@ieee.org>

Marco wrote:
> Marco wrote:
>
>   
>> Hi,
>>
>> There happened something that I do not understand. Actually I don't even
>> know how it can be possible.
>>
>> I import a module and then the name space of the importing module seems do
>> be overwritten.
>>
>> my_name = __name__
>> print my_name
>> print len(dir())
>> from x import y as z
>> print __name__
>> print len(dir())
>> print my_name
>>
>> ->
>> __main__
>> 119
>> x
>> 117
>> unhandled NameError "name 'my_name' is not defined"
>>
>> The module x is from me, and I am not aware of doing anything cruel there.
>> What evil thing can be done in its sub module that can result in that
>> strange thing?
>>     
>
>
> I just discovered the .pyc file for the main module is not created. When I 
> delete the old pyc and import the main module from the python shell it works 
> fine. But when I start it with "python main_module.py" the .pyc is not 
> created and it happens as shown above.
>
> So what leads to the behavior that the .pyc is not created?
>
> br
> Marco
>
>
>   
As others have said, you didn't post nearly enough of your code to 
duplicate the problem.  But I have a reasonable guess:

I suspect you've got two modules that each import the other.  If you run 
one of them as the (__main__) script from the command line, you get some 
pretty weird behavior.  To put it simply, don't ever do an import of 
"main_module" if you expect to be able to run "python main_module.py"

I suspect the underlying cause is that that module is called __name__  ( 
you know that if you've ever coded  if __name__ == "__main__"    When 
you try to import it by its actual file name, it thinks it's a new one.  
And you don't ever want two instances of the same module.  You end up 
with two copies of the global variables, and some code refers to one and 
some refers to the other, for example.

You can get into trouble any time you have mutual importing (a imports 
b., and b import a) or indirect mutual importing (a imports b, which 
imports c, which imports a).  Many languages have similar problems, as 
do Windows DLL's.  But it's even worse if your __main__ script is in the 
mix.

As Stephen suggests, write a very small script which does the initial 
import.




From research at johnohagan.com  Fri May  8 23:48:48 2009
From: research at johnohagan.com (John O'Hagan)
Date: Sat, 9 May 2009 03:48:48 +0000
Subject: slice iterator?
In-Reply-To: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
Message-ID: <200905090348.48444.research@johnohagan.com>

On Sat, 9 May 2009, Ross wrote:
> lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> a way to do this without explicitly defining new lists? If the above
> problem were to be split into groups of 3, I've tried something like:
>
> start = 0
> stop = 3
> for i in range(len(a)):
> ? ? segment = a[start:stop]
> ? ? print segment
> ? ? start += stop
> ? ? stop += stop

This doesn't work because you're looping over every element in your list 
(instead of every slice) and because you're incrementing the increment by 
using "stop" for two different things (endpoint and increment).

This seems to work:

>>> for i in range (len(a) / 3):
...     segment = a[3 * i:3 * (i + 1)]
...     print segment

Regards,

john


From lie.1296 at gmail.com  Fri May  8 23:58:46 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sat, 09 May 2009 03:58:46 GMT
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
Message-ID: <Wb7Nl.9780$y61.3614@news-server.bigpond.net.au>

Casey Hawthorne wrote:
> I'm intrigued that Python has some functional constructions in the
> language.
> 
> Would it be possible to more clearly separate the pure code (without
> side effects) from the impure code (that deals with state changes,
> I/O, etc.), so that the pure code could be compiled and have
> aggressive functional transformations applied to it for efficiency.

Choosing a better algorithm usually have much more impact on efficiency 
than programming to the language's optimization scheme. A slow algorithm 
will always be slow no matter how much (functional or regular) 
optimization in it[1]. If you bother efficiency that much, maybe python 
is not the best suited language for you.

> That way, the syntax would be a lot easier to understand, than most
> functional languages, like Haskell.

Python's syntax is already easier to understand than most functional 
language, and it also support functional-style programming. However, 
python is still an imperative language, no matter how much functional 
functionalities (pun not intended) is in it.


[1] of course there are certain types of optimizations -- that actually 
changes the algorithm -- that may have a significant impact, such as 
memoization. However if you know memoization well enough, you wouldn't 
want to activate it on all pure functions...


From research at johnohagan.com  Sat May  9 00:05:13 2009
From: research at johnohagan.com (John O'Hagan)
Date: Sat, 9 May 2009 04:05:13 +0000
Subject: slice iterator?
In-Reply-To: <200905090348.48444.research@johnohagan.com>
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
	<200905090348.48444.research@johnohagan.com>
Message-ID: <200905090405.14088.research@johnohagan.com>

On Sat, 9 May 2009, John O'Hagan wrote:
> On Sat, 9 May 2009, Ross wrote:
> > lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> > wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> > a way to do this without explicitly defining new lists? If the above
> > problem were to be split into groups of 3, I've tried something like:
[..]
>
> This seems to work:
> >>> for i in range (len(a) / 3):
>
> ...     segment = a[3 * i:3 * (i + 1)]
> ...     print segment
[...]

But if len(a) is not divisible by the increment, that misses the last (short) 
slice, so using the step argument to range:

>>> for i in range (0, len(a), 3):
...     segment = a[i:i + 3]
...     print segment

is better. Or as a list comprehension:

[a[i:i + 3] for i in range (0, len(a), 3)]


HTH,

John


From nad at acm.org  Sat May  9 00:14:32 2009
From: nad at acm.org (Ned Deily)
Date: Sat, 09 May 2009 00:14:32 -0400
Subject: slice iterator?
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
	<7xprejoswg.fsf@ruckus.brouhaha.com>
Message-ID: <nad-271FBD.00143109052009@ger.gmane.org>

In article <7xprejoswg.fsf at ruckus.brouhaha.com>,
 Paul Rubin <http://phr.cx at NOSPAM.invalid> wrote:
> Ross <ross.jett at gmail.com> writes:
> > I have a really long list that I would like segmented into smaller
> > lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> > wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> > a way to do this without explicitly defining new lists? 
> 
> That question comes up so often it should probably be a standard
> library function.
> 
> Anyway, here is an iterator, if that's what you want:
>    >>> from itertools import islice
>    >>> a = range(12)
>    >>> xs = iter(lambda x=iter(a): list(islice(x,3)), [])
>    >>> print list(xs)
>    [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10, 11]]
> Of course, as the saying goes, there's more than one way to do it ;-)

python2.6 itertools introduces the izip_longest function and the grouper 
recipe <http://docs.python.org/library/itertools.html>:

def grouper(n, iterable, fillvalue=None):
    "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
    args = [iter(iterable)] * n
    return izip_longest(fillvalue=fillvalue, *args)

-- 
 Ned Deily,
 nad at acm.org



From fetchinson at googlemail.com  Sat May  9 00:34:54 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Fri, 8 May 2009 21:34:54 -0700
Subject: mod_python and xml.dom.minidom
In-Reply-To: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
Message-ID: <fbe2e2100905082134q76dc2354n3d50f437e70a5d5f@mail.gmail.com>

On 5/8/09, dpapathanasiou <denis.papathanasiou at gmail.com> wrote:
> I wrote a python script called xml_utils.py which parses xml using
> minidom.
>
> It works when it's run on its own, but when I try to import it and run
> it inside a mod_python handler, I get this error:
>
>   File "../common/xml_utils.py", line 80, in parse_item_attribute
>   File "/usr/lib/python2.5/xml/dom/minidom.py", line 1924, in
> parseString
>     from xml.dom import expatbuilder
> SystemError: Parent module 'xml.dom' not loaded
>
> Basically, it's the same problem I found in this post:
> http://mail.python.org/pipermail/python-list/2007-January/424018.html
>
> This site (http://www.dscpl.com.au/wiki/ModPython/Articles/
> ExpatCausingApacheCrash) goes through a detailed explanation, and I
> found that the version of pyexpat is newer than libexpat:
>
> # ldd /usr/local/apache2/bin/httpd | grep expat
> 	libexpat.so.0 => /usr/local/apache2/lib/libexpat.so.0 (0xb7f71000)
> # strings /usr/local/apache2/lib/libexpat.so.0 | grep expat_
> expat_1.95.2
>
> $ python
> Python 2.5.2 (r252:60911, Jan  4 2009, 17:40:26)
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import pyexpat
>>>> pyexpat.version_info
> (2, 0, 0)
>
> But this is where I'm stuck: the article suggests recompiling apache
> with the newer version of expat.
>
> Apache's configure utility (I'm using httpd version 2.2.11) doesn't
> explicitly describe an expat library option.
>
> Also, if libexpat is version 1.95.2, wouldn't I have to get version
> 2.0 to be compatible with pyexpat?
>
> If anyone has any advice or suggestions, I'd appreciate hearing them.

My only advice is, don't use mod_python. The project is dead, you
should use mod_wsgi instead: http://code.google.com/p/modwsgi/

Cheers,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From timr at probo.com  Sat May  9 00:36:35 2009
From: timr at probo.com (Tim Roberts)
Date: Fri, 08 May 2009 21:36:35 -0700
Subject: ISO exemplary Python scripts
References: <gu2j3n$a90$1@reader1.panix.com>
Message-ID: <802a051qoqmpnih0j2su9hhriqumagu326@4ax.com>

kj <socyl at 987jk.com.invalid> wrote:
>
>I'm learning python, for the umpteenth time.  This time I decided
>to start out by writing Python scripts for everyday tasks.  Most
>of these scripts are meant to be used only once or twice, but a
>few of them have become useful enough that I'd like to make them
>a little bit more solid...
>
>I'd like to learn from well-written Python scripts, with well-structured
>options parsing, good error and help messages, clear organization,
>etc.
>
>Can someone point me to good examples of Python scripts?

The standard library that was installed with your interpreter is one of the
best repositories.  It contains hundreds of working, well-tested scripts,
most of which have the ability to run by themselves.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From anuraguniyal at yahoo.com  Sat May  9 00:44:39 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 8 May 2009 21:44:39 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<0vadnQqkdrdQz5nXnZ2dnUVZ_uOdnZ2d@pdx.net>
Message-ID: <d8876306-5df4-464c-acf5-b58905c5594e@y34g2000prb.googlegroups.com>

sorry for not being specfic and not given all info

"""
Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52)
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
'Linux-2.6.24-19-generic-i686-with-debian-lenny-sid'
"""

My question has not much to do with stdout because I am able to print
unicode
so
print unicode(a) works
print unicode([a]) doesn't

without print too
s1 = u"%s"%a works
s2 = u"%s"%[a] doesn't
niether does s3 = u"%s"%unicode([a])
error is UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in
position 1: ordinal not in range(128)

so question is how can I use a list of object whose representation
contains unicode in another unicode string

I am now using __repr__ = unicode(self).encode("utf-8")
but it give error anyway


From ldo at geek-central.gen.new_zealand  Sat May  9 00:47:15 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 09 May 2009 16:47:15 +1200
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net> <gu29cb$8gg$1@lust.ihug.co.nz>
	<692b7ae8-0c5b-498a-a012-51bda980f3b9@s28g2000vbp.googlegroups.com>
Message-ID: <gu31sj$mk8$2@lust.ihug.co.nz>

In message <692b7ae8-0c5b-498a-
a012-51bda980f3b9 at s28g2000vbp.googlegroups.com>, namekuseijin wrote:

> On May 8, 6:48 pm, Lawrence D'Oliveiro <l... at geek-
> central.gen.new_zealand> wrote:
>> In message <gu269i$16i... at adenine.netfront.net>, namekuseijin wrote:
>>
>> > Carl Banks escreveu:
>>
>> >> 2. However, functional programming is cryptic at some level no matter
>> >> how nice you make the syntax.
>>
>> > When your program is nothing but function definition and function
>> > application, syntax is meaningless.
>>
>> On the contrary, syntax is vital to the correct interpretation of
>> functional constructs. See, for example,
>> <http://mail.python.org/pipermail/python-list/2008-October/683816.html>.
> 
> Yeah, it's important in an imperative language ...

That was an example of functional programming.



From ldo at geek-central.gen.new_zealand  Sat May  9 00:48:48 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 09 May 2009 16:48:48 +1200
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
	<gu0ofm$oj9$00$1@news.t-online.com> <gu141o$iek$4@lust.ihug.co.nz>
	<mailman.5285.1241786958.11746.python-list@python.org>
Message-ID: <gu31vg$mk8$3@lust.ihug.co.nz>

In message <mailman.5285.1241786958.11746.python-list at python.org>, andrew 
cooke wrote:

> Lawrence D'Oliveiro wrote:
>> In message <gu0ofm$oj9$00$1 at news.t-online.com>, Peter Otten wrote:
>>
>>> While it may not matter here using placeholders instead of manually
>>> escaping user-provided values is a good habit to get into.
>>
>> Until you hit things it can't deal with.
> 
> Can you expand on your comment?  I assume you are thinking of how the
> library might handle some strange class.

Consider something as simple as a "like" clause.



From Scott.Daniels at Acm.Org  Sat May  9 00:49:43 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 21:49:43 -0700
Subject: slice iterator?
In-Reply-To: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
Message-ID: <upudnag_m9Gul5jXnZ2dnUVZ_uadnZ2d@pdx.net>

Ross wrote:
> I have a really long list that I would like segmented into smaller
> lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> a way to do this without explicitly defining new lists? If the above
> problem were to be split into groups of 3, I've tried something like:
> ... Ideally, my outcome would be
> [1,2,3]
> [4,5,6]
> [7,8,9]
> [10,11,12]

     for i in range(0, len(a), 3):
         segment = a[i : i +3]
         print segment

--Scott David Daniels
Scott.Daniels at Acm.Org


From ldo at geek-central.gen.new_zealand  Sat May  9 00:50:55 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 09 May 2009 16:50:55 +1200
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
	<gu0ofm$oj9$00$1@news.t-online.com> <gu141o$iek$4@lust.ihug.co.nz>
	<mailman.5285.1241786958.11746.python-list@python.org>
	<b7c68e74-21ae-4133-a058-e3c669f0faf6@o20g2000vbh.googlegroups.com>
	<mailman.5299.1241800722.11746.python-list@python.org>
Message-ID: <gu323f$mk8$4@lust.ihug.co.nz>

In message <mailman.5299.1241800722.11746.python-list at python.org>, andrew 
cooke wrote:

> even if you're not open to injection attacks, you're still less likely to
> get escaping correct than a puprose written, widely used library.

Escaping isn't really that hard to do. For example, the rules for MySQL 
literals are clearly spelled out here 
<http://dev.mysql.com/doc/refman/5.0/en/string-syntax.html>. You can easily 
check that against my quoting routines here 
<http://codecodex.com/wiki/index.php?title=Useful_MySQL_Routines#Quoting>.



From apt.shansen at gmail.com  Sat May  9 00:50:59 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 8 May 2009 21:50:59 -0700
Subject: mod_python and xml.dom.minidom
In-Reply-To: <fbe2e2100905082134q76dc2354n3d50f437e70a5d5f@mail.gmail.com>
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<fbe2e2100905082134q76dc2354n3d50f437e70a5d5f@mail.gmail.com>
Message-ID: <7a9c25c20905082150y6a8bd08cnaa32fefdfce8ae1e@mail.gmail.com>

>
> My only advice is, don't use mod_python. The project is dead, you
>  should use mod_wsgi instead: http://code.google.com/p/modwsgi/
>

To echo what Daniel said, mod_wsgi is really the way to go. It might still
not work in "embedded" mode where like mod_python the Python interpreter is
in the Apache instance thus there might be binary linking conflicts, but you
can use it in daemon mode where it launches external python processes and
passes requests back and forth through them. That's not as slow as it sounds
too :)

Also maybe check out lxml or ElementTree (cElementTree); minidom is about
*the* slowest way to parse XML in Python I believe. And is terribly
unpythonic-- which may be why you made xml_utils, I dunno. Check out
lxml/ElementTree :)

--S
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From pavlovevidence at gmail.com  Sat May  9 00:52:22 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 8 May 2009 21:52:22 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com> 
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com> 
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
Message-ID: <e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>

On May 8, 7:19?pm, namekuseijin <namekusei... at gmail.com> wrote:
> On May 8, 10:13?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>
> > On May 8, 5:47?pm, namekuseijin <namekusei... at gmail.com> wrote:
>
> > > My point is that when all you do is call functions, syntax is
> > > irrelevant. ?You call functions pretty much in the same way regardless
> > > of language: ?functionname, optionalOpenPar, parameters,
> > > optionalClosePar.
>
> > then...
>
> > > Functional programming is all about defining functions and applying
> > > functions. ?Core ML, Haskell and Scheme are all like that,
>
> > Yet all three use a different syntax to call functions, none of them
> > the "pretty much the same way" you listed above.
>
> It's still functionName arguments AFAIK. ?Some using parentheses
> around the arguments, some around all, some not using parentheses at
> all.

Some using commas, some not, some grouping arguments by arity, some
not, some allowing keyword argument, some not, etc.  Point is, even
the thing you claim hardly varies between languages does vary a
significant bit, but it's not nearly as much as other syntactic
differences in functional languages.


> > Haskell and Python have syntax for list operations, that matters.
>
> > Haskell nexts using indentation, the others nest using tokens(**),
> > that matters.
>
> In Haskell, Lisp and other functional programming languages, any extra
> syntax gets converted into the core lambda constructs.

So?  The user still uses that syntax, so how can you claim it doesn't
matter?


>?In Lisp
> languages, that syntax is merely user-defined macros, but in Haskell
> it's builtin the compiler for convenience.

I don't even know what you're saying here


> > I can go on, but you get the idea. ?Point is: functional programmint
> > isn't "nothing but calling functions".
>
> Oh yes, functional programming is all about function definition and
> function calling.

Fine.

Functional programming isn't "nothing but calling functions USING
FUNCTION-CALL SYNTAX".


>?You have a point about higher order functions, but
> that's really only useful as far as your lambda expressions are useful
> -- that is, conveniently defining anonymous functions on-the-fly and
> immediately applying them.

I made no such point.  You may be confusing me with Paul, and I can't
imagine what higher-order functions have to do with whether syntax is
important or not.


Carl Banks


From ptmcg at austin.rr.com  Sat May  9 01:04:33 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Fri, 8 May 2009 22:04:33 -0700 (PDT)
Subject: slice iterator?
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
	<7xprejoswg.fsf@ruckus.brouhaha.com>
	<mailman.5327.1241842488.11746.python-list@python.org>
Message-ID: <d6b9a688-5294-4b96-a69e-0c48a33216c0@h23g2000vbc.googlegroups.com>

On May 8, 11:14?pm, Ned Deily <n... at acm.org> wrote:
> In article <7xprejoswg.... at ruckus.brouhaha.com>,
> ?Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>
>
>
>
>
> > Ross <ross.j... at gmail.com> writes:
> > > I have a really long list that I would like segmented into smaller
> > > lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> > > wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> > > a way to do this without explicitly defining new lists?
>
> > That question comes up so often it should probably be a standard
> > library function.
>
> > Anyway, here is an iterator, if that's what you want:
> > ? ?>>> from itertools import islice
> > ? ?>>> a = range(12)
> > ? ?>>> xs = iter(lambda x=iter(a): list(islice(x,3)), [])
> > ? ?>>> print list(xs)
> > ? ?[[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10, 11]]
> > Of course, as the saying goes, there's more than one way to do it ;-)
>
> python2.6 itertools introduces the izip_longest function and the grouper
> recipe <http://docs.python.org/library/itertools.html>:
>
> def grouper(n, iterable, fillvalue=None):
> ? ? "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
> ? ? args = [iter(iterable)] * n
> ? ? return izip_longest(fillvalue=fillvalue, *args)
>
> --
> ?Ned Deily,
> ?n... at acm.org- Hide quoted text -
>
> - Show quoted text -

Here's a version that works pre-2.6:

>>> grouper = lambda iterable,size,fill=None : zip(*[(iterable+[fill,]*(size-1))[i::size] for i in range(size)])
>>> a = range(12)
>>> grouper(a,6)
[(0, 1, 2, 3, 4, 5), (6, 7, 8, 9, 10, 11)]
>>> grouper(a,5)
[(0, 1, 2, 3, 4), (5, 6, 7, 8, 9), (10, 11, None, None, None)]
>>> grouper(a,3)
[(0, 1, 2), (3, 4, 5), (6, 7, 8), (9, 10, 11)]

-- Paul


From stefan_ml at behnel.de  Sat May  9 01:07:25 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 09 May 2009 07:07:25 +0200
Subject: mod_python and xml.dom.minidom
In-Reply-To: <mailman.5328.1241843700.11746.python-list@python.org>
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<mailman.5328.1241843700.11746.python-list@python.org>
Message-ID: <4a050f8d$0$31862$9b4e6d93@newsspool3.arcor-online.net>

Daniel Fetchinson wrote:
> On 5/8/09, dpapathanasiou wrote:
>> I wrote a python script called xml_utils.py which parses xml using
>> minidom.
> 
> My only advice is, don't use mod_python. The project is dead, you
> should use mod_wsgi instead: http://code.google.com/p/modwsgi/

Now that we're at it anyway: don't use minidom, either. It's rather slow
and very memory expensive. The stdlib comes with ElementTree since Python 2.5.

http://effbot.org/zone/celementtree.htm#benchmarks

Stefan


From ldo at geek-central.gen.new_zealand  Sat May  9 02:44:47 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 09 May 2009 18:44:47 +1200
Subject: bulk_copy
Message-ID: <gu38ov$qk7$2@lust.ihug.co.nz>

Every now and then I've had the need to copy a bunch of records in a MySQL 
table--perhaps take a copy of some production data into a test database to 
track down a bug, that kind of thing. So I wrote a utility to do it.

<http://github.com/ldo/bulk_copy/tree/master>



From anuraguniyal at yahoo.com  Sat May  9 03:04:46 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Sat, 9 May 2009 00:04:46 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
Message-ID: <977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>

also not sure why (python 2.5)
print a # works
print unicode(a) # works
print [a] # works
print unicode([a]) # doesn't works


From george.sakkis at gmail.com  Sat May  9 03:48:53 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Sat, 9 May 2009 00:48:53 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com> 
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com> 
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar> 
	<op.uti1kf0ga8ncjz@gnudebst> <1241649200.4a0210301f77e@mail.uh.cu> 
	<mailman.5189.1241657949.11746.python-list@python.org>
	<pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au> 
	<mailman.5200.1241663550.11746.python-list@python.org>
Message-ID: <bd6706f8-cf0b-46bb-92ae-240c9ea99a61@r13g2000vbr.googlegroups.com>

On May 6, 10:32?pm, Luis Alberto Zarrabeitia Gomez <ky... at uh.cu>
wrote:

> A bit offtopic: a while ago I think I saw a recipe for a decorator that, via
> bytecode hacks, would bind otherwise global names to the local namespace of the
> function. Can anyone remember it/point me to it?

Maybe you saw http://code.activestate.com/recipes/277940/ ?

George


From iwan at reahl.org  Sat May  9 04:02:08 2009
From: iwan at reahl.org (Iwan)
Date: Sat, 9 May 2009 01:02:08 -0700 (PDT)
Subject: How to debug this import problem?
References: <mailman.5300.1241802485.11746.python-list@python.org> 
	<76j8vcF1crfkoU1@mid.uni-berlin.de>
	<DumdnY8P7-xs65nXnZ2dnUVZ_jidnZ2d@pdx.net>
Message-ID: <ebc63140-6f1f-44a0-8046-574fb3530fed@s21g2000vbb.googlegroups.com>

Hi Scott, Diez,

On May 8, 8:21?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> Diez B. Roggisch wrote:
> > Try putting an "import pdb; pdb.set_trace()" on top of the decimal module.
[snip]
> You can also run Python with the "-v" or "-vv" flags to get output
> about exactly what files are getting imported from the file
> system and when. ?"-v" iswhat it got, "-vv" is everywhere it tries.

Thanks, yes we did do the pdb.set_trace(), but everything looked fine
(ie, the paths used to import each module from was the same each time)
in there except for the fact that id(sys) and id(decimal) were
different each time decimal got imported.  Python -vv also reveals
that the paths used to import the modules from are always the same
paths and correct.

However, on the stack trace, there is another strangeness:

We have a little script that loads the tests that have to be run.
This loading happens 3 times, and the module is imported 3 times -
each time as a result of loading tests. This happens with the
following line:

module = __import__(moduleName, globals(), locals(), [className])

I was wondering whether this could have something to do with it?

Regards
- Iwan


From __peter__ at web.de  Sat May  9 04:09:24 2009
From: __peter__ at web.de (Peter Otten)
Date: Sat, 09 May 2009 10:09:24 +0200
Subject: heapq.merge with key=
References: <gtvjgk$tm8$1@foggy.unx.sas.com>
	<mailman.5264.1241758129.11746.python-list@python.org>
	<gu1gpj$nue$1@foggy.unx.sas.com>
Message-ID: <gu3dni$tkj$00$1@news.t-online.com>

Kevin D.  Smith wrote:

> On 2009-05-07 23:48:43 -0500, Chris Rebert <clp2 at rebertia.com> said:
> 
>> On Thu, May 7, 2009 at 2:23 PM, Kevin D. Smith <Kevin.Smith at sas.com>
>> wrote:
>>> I need the behavior of heapq.merge to merge a bunch of results from a
>>> database.  I was doing this with sorted(itertools.chain(...), key=
>> ...), but
>>> I would prefer to do this with generators.  My issue is that I need
>> the key
>>> argument to sort on the correct field in the database.  heapq.merge
>> doesn't
>>> have this argument and I don't understand the code enough to know if
>>> it's possible to add it.  Is this enhancement possible without
>>> drasticall
>> y
>>> changing the current code?
>> 
>> I think so. Completely untested code:
>> 
>> def key(ob):
>>     #code here
>> 
>> class Keyed(object):
>>     def __init__(self, obj):
>>         self.obj = obj
>>     def __cmp__(self, other):
>>         return cmp(key(self.obj), key(other.obj))
>> 
>> def keyify(gen):
>>     for item in gen:
>>         yield Keyed(item)
>> 
>> def stripify(gen):
>>     for keyed in gen:
>>         yield keyed.obj
>> 
>> merged = stripify(merge(keyify(A), keyify(B), keyify(C))) #A,B,C being
>> the iterables
> 
> Ah, that's not a bad idea.  I think it could be simplified by letting
> Python do the comparison work as follows (also untested).
> 
> def keyify(gen, key=lamda x:x):
>     for item in gen:
>         yield (key(item), item)
> 
> def stripify(gen):
>     for item in gen:
>         yield item[1]

This is not as general. It makes sorting unstable and can even fail if the 
items are unorderable:

>>> def decorate(gen, key):
...     for item in gen:
...             yield key(item), item
...
>>> def undecorate(gen):
...     for item in gen:
...             yield item[-1]
...
>>> sorted(decorate([1j, -1j, 1+1j], key=lambda c: c.real))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: no ordering relation is defined for complex numbers

One way to fix it:

>>> def decorate(gen, key):
...     for index, item in enumerate(gen):
...             yield key(item), index, item
...
>>> sorted(decorate([1j, -1j, 1+1j], key=lambda c: c.real))
[(0.0, 0, 1j), (0.0, 1, -1j), (1.0, 2, (1+1j))]
>>> list(undecorate(_))
[1j, -1j, (1+1j)]

Peter



From bvdmyrby at jyxk16274849.net  Sat May  9 04:30:46 2009
From: bvdmyrby at jyxk16274849.net (Raoul Gough)
Date: Sat, 09 May 2009 09:30:46 +0100
Subject: MacPython 3.0.1 installation problem, no /usr/local/bin/python*
Message-ID: <m2vdoad6fd.fsf@yahoo.co.uk>

I just installed MacPython 3.0.1 (woot!) but the installer didn't seem
to do an absolutely complete job. According to the ReadMe.txt, "The
installer puts [...] command-line tools in /usr/local/bin [...]". This
didn't happen - even after the install reported Success, there were no
python files or symlinks under /usr/local/bin.

Also, I'm guessing there should have been a symlink to the current
version under /Library/Frameworks/Python.framework/Versions, which
wasn't there either:

$ cd /Library/Frameworks/Python.framework
$ ls -l Python
lrwxr-xr-x  1 root  admin  23 May  9 08:34 Python -> Versions/Current/Python
$ ls -l Versions/Current
ls: Versions/Current: No such file or directory

So I fixed this all up as follows:

$ cd /Library/Frameworks/Python.framework/Versions
$ sudo ln -s 3.0 Current
$ cd /usr/local/bin
$ sudo ln -s $(find /Library/Frameworks/Python.framework/Versions/Current/bin -type f) .

So did something go wrong with the installer, or is it all supposed to
work somehow differently?

-- 
Raoul Gough.


From george.sakkis at gmail.com  Sat May  9 04:37:32 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Sat, 9 May 2009 01:37:32 -0700 (PDT)
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
Message-ID: <b3b6788c-42ad-4c65-b999-48f420e90630@o20g2000vbh.googlegroups.com>

On May 8, 11:33 am, Mikael Olofsson <mik... at isy.liu.se> wrote:

> Hi all!
>
> I have long tried to avoid decorators, but now I find myself in a
> situation where I think they can help. I seem to be able to decorate
> functions, but I fail miserably when trying to decorate methods. The
> information I have been able to find on-line focuses on decorating
> functions, and do not mention any special problem regarding methods.
>
> Consider the following example. I start by defining a simple decorator:
>
>  >>> class test_decorator(object):
> ...     def __init__(self,func):
> ...         self._func = func
> ...     def __call__(self, *args):
> ...         print 'Decorator:', args
> ...         self._func(*args)
>
> Then I decorate a function:
>
>  >>> @test_decorator
> ... def func(*args):
> ...     print 'Function: ', args
>
> Let's try that:
>
>  >>> func(1,2,3)
> Decorator: (1, 2, 3)
> Function:  (1, 2, 3)
>
> OK! That was what I expected. Let's decorate a method:
>
>  >>> class cls(object):
> ...     @test_decorator
> ...     def meth(self,*args):
> ...         print 'Method:   ', args
>
> Then try that:
>
>  >>> cls().meth(1,2,3)
> Decorator: (1, 2, 3)
> Method:    (2, 3)
>
> Oops! That's weird. I had expected - or at least wanted - the same
> result as for the function above.
>
> Where did the first argument go? If it was sent to the original method
> meth as the real first argument (self), then why did I not get an exception?
>
> More importantly: How do I write a decorator that does not drop arguments?
>
> I guess it all has to do with the fact that the returned callable isn't
> a method of cls. Is it possible to write a decorator that returns a
> callable that is a method of cls, when used on methods in cls?

Yes, just return an actual function from the decorator instead of a
callable object:

def test_decorator2(func):
    def wrapper(*args):
        print 'Decorator2:', args
        func(*args)
    return wrapper


class cls(object):
    @test_decorator
    def meth(self,*args):
        print 'Method:   ', args

    @test_decorator2
    def meth2(self,*args):
        print 'Method2:   ', args

>>> cls.meth
<__main__.test_decorator object at 0x87663cc>

>>> cls.meth2
<unbound method cls.wrapper>

>>> cls().meth2(1,2,3)
Decorator2: (<__main__.cls object at 0x8766ecc>, 1, 2, 3)
Method2:    (1, 2, 3)

The reason this works is that functions are already descriptors, so
you don't have to explicitly define __get__() as you would for a new
callable class (see Peter's example).

HTH,
George


From tuomas.vesterinen at iki.fi  Sat May  9 04:57:48 2009
From: tuomas.vesterinen at iki.fi (Tuomas Vesterinen)
Date: Sat, 09 May 2009 11:57:48 +0300
Subject: Problems with datetime.datetime.strptime
Message-ID: <4a05458d$0$24784$9b536df3@news.fv.fi>

I hoped that I could get rid of my special module _strptime2 when 
porting to Python 3.0. But testing is a disappointment.

Python 3.0.1 (r301:69556, Apr 14 2009, 14:30:31)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import locale, datetime
 >>> def test1(locale_str, val):
...     print(locale.setlocale(locale.LC_ALL, locale_str), ':')
...     test_cases = [
...         locale.nl_langinfo(locale.D_T_FMT), # test default formats
...         locale.nl_langinfo(locale.D_FMT),
...         locale.nl_langinfo(locale.T_FMT)
...     ]
...     for form in test_cases:
...         string = val.strftime(form)
...         print("  strftime(%s)=%s" % (repr(form), repr(string)))
...         print("  strptime(%s,%s)=" % (repr(string), repr(form)), 
end=' ')
...         try:
...             val2 = datetime.datetime.strptime(string, form)
...         except ValueError as e:
...             print('\n   ', str(e))
...         else:
...             print('\n   ', str(val2))
...
 >>> now = datetime.datetime.now()
 >>> for loc in ('C', 'en_US.UTF-8', 'fi_FI.UTF-8'):
...     test1(loc, now)
...
C :
   strftime('%a %b %e %H:%M:%S %Y')='Sat May  9 11:26:12 2009'
   strptime('Sat May  9 11:26:12 2009','%a %b %e %H:%M:%S %Y')=
     'e' is a bad directive in format '%a %b %e %H:%M:%S %Y'
   strftime('%m/%d/%y')='05/09/09'
   strptime('05/09/09','%m/%d/%y')=
     2009-05-09 00:00:00
   strftime('%H:%M:%S')='11:26:12'
   strptime('11:26:12','%H:%M:%S')=
     1900-01-01 11:26:12
en_US.UTF-8 :
   strftime('%a %d %b %Y %r %Z')='Sat 09 May 2009 11:26:12 AM '
   strptime('Sat 09 May 2009 11:26:12 AM ','%a %d %b %Y %r %Z')=
     'r' is a bad directive in format '%a %d %b %Y %r %Z'
   strftime('%m/%d/%Y')='05/09/2009'
   strptime('05/09/2009','%m/%d/%Y')=
     2009-05-09 00:00:00
   strftime('%r')='11:26:12 AM'
   strptime('11:26:12 AM','%r')=
     'r' is a bad directive in format '%r'
fi_FI.UTF-8 :
   strftime('%a %e. %Bta %Y %T')='la  9. toukokuuta 2009 11:26:12'
   strptime('la  9. toukokuuta 2009 11:26:12','%a %e. %Bta %Y %T')=
     'e' is a bad directive in format '%a %e. %Bta %Y %T'
   strftime('%d.%m.%Y')='09.05.2009'
   strptime('09.05.2009','%d.%m.%Y')=
     2009-05-09 00:00:00
   strftime('%T')='11:26:12'
   strptime('11:26:12','%T')=
     'T' is a bad directive in format '%T'

What to do.
Tuomas Vesterinen


From ggardiner at iee.org  Sat May  9 05:01:44 2009
From: ggardiner at iee.org (Geoff Gardiner)
Date: Sat, 09 May 2009 10:01:44 +0100
Subject: How do I test the integrity of a Python installation in Debian
	and	Ubuntu
In-Reply-To: <gu1pa8$4mj$1@panix3.panix.com>
References: <mailman.5282.1241783298.11746.python-list@python.org>
	<gu1pa8$4mj$1@panix3.panix.com>
Message-ID: <4A054678.40503@iee.org>

Aahz wrote:
> How important is the apt-get requirement?  

That's a significant point, thank you. Two parts to the response:

a) I don't feel that I am sufficiently expert to launch into compilation
of Python if I can avoid it.

b) I hope that I can put all platform risk into the lap of the hosting
provider, and apt-get is probably the only delivery mechanism they will
take any responsibility for. (I want to use their 'standard'.)

All the best,
Geoff




From chris at simplistix.co.uk  Sat May  9 05:06:52 2009
From: chris at simplistix.co.uk (Chris Withers)
Date: Sat, 09 May 2009 10:06:52 +0100
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <49FB3384.1030106@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB2398.5000708@simplistix.co.uk> <49FB261F.9080306@v.loewis.de>
	<49FB2A2A.4090606@simplistix.co.uk> <49FB3384.1030106@v.loewis.de>
Message-ID: <4A0547AC.7060103@simplistix.co.uk>

Martin v. L?wis wrote:
> Ok, so create three tar files:
> 
> 1. base.tar, containing
> 
>    simplistix/
>    simplistix/__init__.py

So this __init__.py can have code in it? And base.tar can have other 
modules and subpackages in it?
What happens if the base and an addon both define a package called 
simplistix.somepackage?

> 2. addon1.tar, containing
> 
>    simplistix/addon1.pth (containing a single "*")

What does that * mean? I thought .pth files just had python in them?

> Unpack each of them anywhere on sys.path, in any order.

How would this work if base, addon1 and addon2 were eggs managed by 
buildout or setuptools?

cheers,

Chris

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk


From martin at v.loewis.de  Sat May  9 05:27:22 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 09 May 2009 11:27:22 +0200
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <4A0547AC.7060103@simplistix.co.uk>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>	<49FB2398.5000708@simplistix.co.uk>
	<49FB261F.9080306@v.loewis.de>	<49FB2A2A.4090606@simplistix.co.uk>
	<49FB3384.1030106@v.loewis.de> <4A0547AC.7060103@simplistix.co.uk>
Message-ID: <4A054C7A.8020806@v.loewis.de>

>> Ok, so create three tar files:
>>
>> 1. base.tar, containing
>>
>>    simplistix/
>>    simplistix/__init__.py
> 
> So this __init__.py can have code in it? 

That's the point, yes.

> And base.tar can have other modules and subpackages in it?

Certainly, yes.

> What happens if the base and an addon both define a package called
> simplistix.somepackage?

Depends on whether simplistix.somepackage is a namespace package
(it should). If so, they get merged just as any other namespace
package.

>> 2. addon1.tar, containing
>>
>>    simplistix/addon1.pth (containing a single "*")
> 
> What does that * mean?

See PEP 382 (search for "*").

> I thought .pth files just had python in them?

Not at all - they never did. They have paths in them.

>> Unpack each of them anywhere on sys.path, in any order.
> 
> How would this work if base, addon1 and addon2 were eggs managed by
> buildout or setuptools?

What is a managed egg (i.e. what kind of management does buildout
or setuptools apply to it)?

Regards,
Martin


From nick at craig-wood.com  Sat May  9 05:30:06 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sat, 09 May 2009 04:30:06 -0500
Subject: ANN: Python process utility (psutil) 0.1.2 released
References: <65f15b53-aacf-4651-a113-960cce25f205@p4g2000vba.googlegroups.com>
Message-ID: <slrnh0ah9f.mk1.nick@irishsea.home.craig-wood.com>

Giampaolo Rodola' <gnewsg at gmail.com> wrote:
>  psutil is a module providing an interface for retrieving information
>  on running processes and system utilization (CPU, memory) in a
>  portable way by using Python, implementing many functionalities
>  offered by tools like ps, top and Windows task manager.
>  It currently supports Linux, OS X, FreeBSD and Windows.

Very nice!

Maybe you should make

  Process()

mean

  Process(os.getpid())

as I often want ask how much memory/cpu is my process using but rarely
want to ask about other processes?

It would be nice if "pydoc psutil" returned something useful also!
You could do this by replacing your current __init__.py (which just
contains "from _psutil import *") with _psutil.py

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From Florian.Wollenschein at FernUni-Hagen.de  Sat May  9 05:41:25 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Sat, 09 May 2009 11:41:25 +0200
Subject: Code - what could be done better?
Message-ID: <gu3j48$cig$1@news-cedar.fernuni-hagen.de>

Hi all,

here's the main code of thc, my txt to html converter. Since I'm a 
beginner it is far, far, faaaaaaar away from perfect or even good :-)
What could be done better?

====================================================================================
#!/usr/bin/env python
# -*- coding: utf-8 -*-

# thc
# Copyright (C) 2007 - 2009 Listick Lorch
#
# <info at listick.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 
02110-1301 USA

import sys
import webbrowser
import texts_en as texts # you have to change only the countrycode like 
texts_de ...
from PyQt4 import QtGui, QtCore
from mainframe_ui import Ui_MainWindow as Frm
import abtDialogFrame

class ThcMainframe(QtGui.QMainWindow, Frm):
     def __init__(self):
         QtGui.QMainWindow.__init__(self)
         self.setupUi(self)

         # ---MEMBERS---
         self.file_to_convert     = ''
         self.file_to_write       = ''
         self.txt_file_to_convert = '' # stores the text of the .txt file
         self.bgColor_R = hex(255)[2:].zfill(2)
         self.bgColor_G = hex(255)[2:].zfill(2)
         self.bgColor_B = hex(255)[2:].zfill(2)
         self.font_size   = 0

         # ---SLOTS---
         # browse file to convert
         self.connect(self.btnBrowseFileConv,
                 QtCore.SIGNAL("clicked()"), self.onBrowseFileConv)
         # browse file to write
         self.connect(self.btnBrowseFileWrite,
                 QtCore.SIGNAL("clicked()"), self.onBrowseFileWrite)
         # convert
         self.connect(self.btnConvert,
                 QtCore.SIGNAL("clicked()"), self.onConvert)
         # show result
         self.connect(self.btnShowResult,
                 QtCore.SIGNAL("clicked()"), self.onShowResult)
         # select color
         self.connect(self.btnColorSelect,
                 QtCore.SIGNAL("clicked()"), self.SelectColor)
         # font size
         self.connect(self.horizontalSlider,
                 QtCore.SIGNAL("changed()"), self.onFontSizeChanged)
         # help menu
         self.connect(self.actionGo_to_listick_org,
                 QtCore.SIGNAL("triggered()"), self.GoToListickOrg)

         self.connect(self.actionAbout,
                 QtCore.SIGNAL("triggered()"), self.OpenAbout)
         # quit
         self.connect(self.btnQuit,
                 QtCore.SIGNAL("clicked()"), self.onQuit)

         self.connect(self.actionExit,
                 QtCore.SIGNAL("triggered()"), self.onQuit)

     def onBrowseFileConv(self):
         self.file_to_convert = QtGui.QFileDialog.getOpenFileName(self, 
texts.FileMenuOpen, '/home', '*.txt')
         self.inpFileConv.setText(self.file_to_convert)

     def onBrowseFileWrite(self):
         self.file_to_write = QtGui.QFileDialog.getSaveFileName(self, 
texts.FileMenuSaveAs, '/home', '*.htm*')
         self.inpFileWrite.setText(self.file_to_write)

     def onConvert(self):
         # read the title
         html_file_title = str(self.inpTitle.displayText())
         # read the txt
         file_open = open(self.file_to_convert)
         print texts.FileOpened
         self.txtOutput.insertPlainText(texts.FileOpened)
         self.txt_file_to_convert = file_open.read()
         file_open.close()
         print texts.FileClosed
         self.txtOutput.insertPlainText(texts.FileClosed)

         # write html
         file_open = open(self.file_to_write, "w")
         print texts.WritingFile
         self.txtOutput.insertPlainText(texts.WritingFile)
         strict_or_transitional = {True: 'Transitional', False: 'Strict'}
         spec = strict_or_transitional[self.rdioBtnTransitional.isChecked()]
         doctype = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 
%s//EN">\n' % spec
         file_open.write(doctype)
         file_open.write('<HTML>\n')
         # HTML head stuff
         file_open.write('<HEAD>\n')
         file_open.write('<META HTTP-EQUIV="Content-Type" 
CONTENT="text/html; charset=UTF-8">\n')
         file_open.write('<TITLE>%s</TITLE>\n' % html_file_title)
         file_open.write('<META NAME="Generator" CONTENT="thc - 
Txt-to-Html-Converter %s">\n' %  texts.versionInfo)
         file_open.write('</HEAD>\n')
         #head end

         #HTML body
         file_open.write('<BODY BGCOLOR="#%s%s%s">\n' % (self.bgColor_R, 
self.bgColor_G, self.bgColor_B))
         file_open.write(self.txt_file_to_convert)
         file_open.write('<BR>')

         # Created-with-thc notice
         file_open.write(texts.createdWithNote)
         file_open.write('</BODY>\n')
         #body end
         file_open.write('</HTML>')

         file_open.close()
         print texts.FileWritten
         self.txtOutput.insertPlainText(texts.FileWritten)
         self.txtOutput.insertPlainText(texts.Success)

     def onShowResult(self):
         webbrowser.open_new(self.file_to_write)

     def SelectColor(self):
         color = QtGui.QColorDialog.getColor()
         self.bgColor_R  = hex(color.red())[2:].zfill(2)
         self.bgColor_G  = hex(color.green())[2:].zfill(2)
         self.bgColor_B  = hex(color.blue())[2:].zfill(2)
         self.txtOutput.insertPlainText("\nSelected color (RGB Hex): 
%s%s%s" % (self.bgColor_R,  self.bgColor_G,  self.bgColor_B))

     def onFontSizeChanged(self):
         self.font_size = horizontalSlider.value()
         self.txtOutput.insertPlainText("font size: %s" % self.font_size)

     def OpenAbout(self):
         abtDialog = abtDialogFrame.ThcAboutDialog()
         abtDialog.setAttribute(QtCore.Qt.WA_DeleteOnClose)
         abtDialog.exec_()

     def GoToListickOrg(self):
         webbrowser.open_new('http://www.listick.org')

     def onQuit(self):
         print texts.Quit
         self.close()

app = QtGui.QApplication(sys.argv)
mainframe = ThcMainframe()
mainframe.show()
sys.exit(app.exec_())
========================================================================================

Thanks in advance.

Listick
http://www.listick.org


From wzab01 at gmail.com  Sat May  9 07:54:50 2009
From: wzab01 at gmail.com (wzab)
Date: Sat, 9 May 2009 04:54:50 -0700 (PDT)
Subject: IIR filter conversion routines for Python?
References: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>
	<mailman.5267.1241760908.11746.python-list@python.org>
Message-ID: <28232dc7-d7d2-4cec-a48e-a0144efa1a5b@v17g2000vbb.googlegroups.com>

On May 8, 7:30?am, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> On Wed, 6 May 2009 11:03:57 -0700 (PDT), wzab <wza... at gmail.com>
> declaimed the following in gmane.comp.python.general:
>
> > Hi,
> > I'm looking for procedures converting theIIRfilters into cascade and/
> > or parallel forms. Something like dir2cas.m or dir2par.m known in the
> > Matlab/Octave world.
> > Unfortunately SciPy does not contain such functions.
>
> ? ? ? ? Well... If they are Matlab scripts (as the .m seems to imply),
> couldn't one just take the source and recode them in SciPy terms.
> --
> ? ? ? ? Wulfraed ? ? ? ?Dennis Lee Bieber ? ? ? ? ? ? ? KD6MOG
> ? ? ? ? wlfr... at ix.netcom.com ? ? ? ? ? ? ? wulfr... at bestiaria.com
> ? ? ? ? ? ? ? ? HTTP://wlfraed.home.netcom.com/
> ? ? ? ? (Bestiaria Support Staff: ? ? ? ? ? ? ? web-a... at bestiaria.com)
> ? ? ? ? ? ? ? ? HTTP://www.bestiaria.com/

Unfortunately the Matlab scripts that are floating around the net  do
not contain the license information.
(e.g. takasila.coe.psu.ac.th/~s4810685/DSP/proakis/PWS_DSP/dir2cas.m )
So I don't know if it sufficient to consider the "public domain"...
Additionally Python is simply different and allows some thing to do in
different (better?) way.
In fact I have almost finished the simple dir2cas.py converter.
I'll post the source as soon, as it is ready.
--
Regards,
WZab



From piet at cs.uu.nl  Sat May  9 08:01:51 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 09 May 2009 14:01:51 +0200
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
Message-ID: <m27i0qiixc.fsf@cs.uu.nl>

>>>>> "anuraguniyal at yahoo.com" <anuraguniyal at yahoo.com> (ac) a ?crit:

>ac> also not sure why (python 2.5)
>ac> print a # works
>ac> print unicode(a) # works
>ac> print [a] # works
>ac> print unicode([a]) # doesn't works

Which code do you use now?

And what does this print?

import sys
print sys.stdout.encoding
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From piet at cs.uu.nl  Sat May  9 08:21:31 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 09 May 2009 14:21:31 +0200
Subject: ANN: Python process utility (psutil) 0.1.2 released
References: <65f15b53-aacf-4651-a113-960cce25f205@p4g2000vba.googlegroups.com>
Message-ID: <m23abeii0k.fsf@cs.uu.nl>

>>>>> "Giampaolo Rodola'" <gnewsg at gmail.com> (GR) wrote:

>GR> Hi,
>GR> I'm pleased to announce the 0.1.2 release of psutil:
>GR> http://code.google.com/p/psutil

Very nice. I was just contemplating writing some python code to get
information from ps (actually virtual memory size of the process) when
your announcement came along. Fortunately I had not yet started writing
the code :=)
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From wzab01 at gmail.com  Sat May  9 09:34:18 2009
From: wzab01 at gmail.com (wzab)
Date: Sat, 9 May 2009 06:34:18 -0700 (PDT)
Subject: IIR filter conversion routines for Python?
References: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>
	<mailman.5267.1241760908.11746.python-list@python.org>
	<28232dc7-d7d2-4cec-a48e-a0144efa1a5b@v17g2000vbb.googlegroups.com>
Message-ID: <2a7b69f5-9059-4eb0-a1ad-c6c58c98b4dd@t11g2000vbc.googlegroups.com>

> In fact I have almost finished the simple dir2cas.py converter.
> I'll post the source as soon, as it is ready.

OK. So here it is as public domain code. Any hints and suggestions
of improvements are appreciated.

http://groups.google.com/group/alt.sources/browse_thread/thread/924fbe2255f8c42d

--
Regards, WZab


From zookog at gmail.com  Sat May  9 09:49:13 2009
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Sat, 9 May 2009 07:49:13 -0600
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <49FB22B5.3040507@simplistix.co.uk>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
Message-ID: <cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>

.pth files are why I can't easily use GNU stow with easy_install.
If installing a Python package involved writing new files into the
filesystem, but did not require reading, updating, and re-writing any
extant files such as .pth files, then GNU stow would Just Work with
easy_install the way it Just Works with most things.

Regards,

Zooko


From chris at simplistix.co.uk  Sat May  9 10:10:23 2009
From: chris at simplistix.co.uk (Chris Withers)
Date: Sat, 09 May 2009 15:10:23 +0100
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <4A054C7A.8020806@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>	<49FB2398.5000708@simplistix.co.uk>
	<49FB261F.9080306@v.loewis.de>	<49FB2A2A.4090606@simplistix.co.uk>
	<49FB3384.1030106@v.loewis.de> <4A0547AC.7060103@simplistix.co.uk>
	<4A054C7A.8020806@v.loewis.de>
Message-ID: <4A058ECF.6050203@simplistix.co.uk>

Martin v. L?wis wrote:
>> So this __init__.py can have code in it? 
> 
> That's the point, yes.
> 
>> And base.tar can have other modules and subpackages in it?
> 
> Certainly, yes.

Great, when is the PEP due to land in 2.x? ;-)

>> What happens if the base and an addon both define a package called
>> simplistix.somepackage?
> 
> Depends on whether simplistix.somepackage is a namespace package
> (it should). If so, they get merged just as any other namespace
> package.

Sorry, I was looking at potential bug cases here. What happens if it's 
not a namespace package?

> See PEP 382 (search for "*").
> 
>> I thought .pth files just had python in them?
> 
> Not at all - they never did. They have paths in them.

I've certainly seen them with python in, and that's what I hate about 
them...

>>> Unpack each of them anywhere on sys.path, in any order.
>> How would this work if base, addon1 and addon2 were eggs managed by
>> buildout or setuptools?
> 
> What is a managed egg (i.e. what kind of management does buildout
> or setuptools apply to it)?

Sorry, bad wording on my part... I guess I meant more how would 
buildout/setuptools go about installing/uninstalling/etc packages 
thatconform to PEP 382? Would setuptools/buildout need modification or 
would the changes take effect lower down in the stack?

cheers,

Chris

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk


From deets at nospam.web.de  Sat May  9 10:13:20 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 09 May 2009 16:13:20 +0200
Subject: Creating temperory files for a web application
In-Reply-To: <275bb932-644b-4f64-80e8-7061ec7b2dff@a5g2000pre.googlegroups.com>
References: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>
	<76ideeF1d1gbsU1@mid.uni-berlin.de>
	<354db318-25b3-4af1-8fb1-cd86a0695637@x31g2000prc.googlegroups.com>
	<275bb932-644b-4f64-80e8-7061ec7b2dff@a5g2000pre.googlegroups.com>
Message-ID: <76lhc0F1diso3U1@mid.uni-berlin.de>

> 
> Hi Diez,
>    I think I understood your point now.
>    Is it ?
>    (1) Have a separate URL for the image - update urls.py for that
>    (2) Pass all the GET parameters to that URL again.
>    (3) Recalculate the fields again in that URL
>    (4) Create the image and send back as image/png based on the
> received fields.
>    Other than the fact that I will be hitting the DB twice - for the
> fields in the original URL and for creating Image in the second URL, I
> think this is the best option.
>    Please let me know whether I have understood correctly.
> 
>    The same option can be done for CSV and PDF files too. Thank you
> very much Diez.

Yep, that's what I meant.

Diez


From deets at nospam.web.de  Sat May  9 10:14:17 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 09 May 2009 16:14:17 +0200
Subject: php to python code converter
In-Reply-To: <mailman.5306.1241805879.11746.python-list@python.org>
References: <4A044D71.1000500@gmail.com>	<20090508113720.06d4a48e.darcy@druid.net>	<mailman.5298.1241800394.11746.python-list@python.org>	<76j97fF1crfkoU2@mid.uni-berlin.de>
	<mailman.5306.1241805879.11746.python-list@python.org>
Message-ID: <76lhdpF1diso3U2@mid.uni-berlin.de>

Dotan Cohen schrieb:
>> I'm almost 100% sure it won't. The code is machine-generated, thus not easy
>> to the human eye, not idiomatic so you don't learn how to write good python
>> through it. You learn how to jump through hoops to code the same way in
>> python that you do in PHP.
>>
> 
> I meant for single functions, not for translating entire apps.

No difference. Either the functions are trivial, or they become 
non-idiomatic.

Diez



From martin at v.loewis.de  Sat May  9 10:18:44 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 09 May 2009 16:18:44 +0200
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
References: <49D4DA72.60401@v.loewis.de>	
	<20090407174355.B62983A4063@sparrow.telecommunity.com>	
	<49E4A58F.70309@egenix.com>	
	<20090414162603.70C843A4100@sparrow.telecommunity.com>	
	<49E4F93B.6010802@egenix.com>	
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	
	<49E59202.6050809@egenix.com>	
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
Message-ID: <4A0590C4.1020904@v.loewis.de>

Zooko O'Whielacronx wrote:
> .pth files are why I can't easily use GNU stow with easy_install.
> If installing a Python package involved writing new files into the
> filesystem, but did not require reading, updating, and re-writing any
> extant files such as .pth files, then GNU stow would Just Work with
> easy_install the way it Just Works with most things.

Please understand that this is the fault of easy_install, not of .pth
files. There is no technical need for easy_install to rewrite .pth
files on installation. It could just as well have created new .pth
files, rather than modifying existing ones.

If you always use --single-version-externally-managed with easy_install,
it will stop editing .pth files on installation.

Regards,
Martin



From Scott.Daniels at Acm.Org  Sat May  9 10:19:45 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 07:19:45 -0700
Subject: Wrapping comments
In-Reply-To: <towb-EA7906.14423909052009@news.individual.de>
References: <towb-EA7906.14423909052009@news.individual.de>
Message-ID: <K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>

Tobias Weber wrote:
> the guideline (PEP 8) is hard wrap to 7x characters. The reason given is 
> that soft wrap makes code illegible.
> 
> So what if you hard wrap code but let comments and docstrings soft-wrap?
You apparently have caught the soft-/hard- disease spread by several
software retailers.  There are no such characters as "hard break,"
"soft break,"  "hard space,"  and "soft space."  Check you ASCII or
Unicode standards if you disagree.  There is a "non-breaking space"
in Unicode, but it doesn't mean what you mean.

If you cannot fix everyone else's editors, print drivers, and display
software to have a "soft wrap" that suits their style, then you are
asking others to bend their workflow to suit your style.  This rule
is not to make the writing or altering of code easier; it is about
making the _reading_ of code easier.  Think of it as a "treaty
point," like the "no tabs" rule -- violating it works fine for any
individual, but following it eases cooperative work.

> ... Or are there editors that can do a "soft hard wrap" while
> keeping  indentation and #comment markers intact?
At least vim and emacs can do so.  Some other editors redefine
standards in order to make their work easier.

--Scott David Daniels
Scott.Daniels at Acm.Org



From martin at v.loewis.de  Sat May  9 10:32:39 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 09 May 2009 16:32:39 +0200
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <4A058ECF.6050203@simplistix.co.uk>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>	<49FB2398.5000708@simplistix.co.uk>
	<49FB261F.9080306@v.loewis.de>	<49FB2A2A.4090606@simplistix.co.uk>
	<49FB3384.1030106@v.loewis.de> <4A0547AC.7060103@simplistix.co.uk>
	<4A054C7A.8020806@v.loewis.de> <4A058ECF.6050203@simplistix.co.uk>
Message-ID: <4A059407.2060803@v.loewis.de>

Chris Withers wrote:
> Martin v. L?wis wrote:
>>> So this __init__.py can have code in it? 
>>
>> That's the point, yes.
>>
>>> And base.tar can have other modules and subpackages in it?
>>
>> Certainly, yes.
> 
> Great, when is the PEP due to land in 2.x? ;-)

Most likely, never - it probably will be implemented only after
the last feature release of 2.x was made.

>>> What happens if the base and an addon both define a package called
>>> simplistix.somepackage?
>>
>> Depends on whether simplistix.somepackage is a namespace package
>> (it should). If so, they get merged just as any other namespace
>> package.
> 
> Sorry, I was looking at potential bug cases here. What happens if it's
> not a namespace package?

Then it will be imported as a regular child package.

>>>> Unpack each of them anywhere on sys.path, in any order.
>>> How would this work if base, addon1 and addon2 were eggs managed by
>>> buildout or setuptools?
>>
>> What is a managed egg (i.e. what kind of management does buildout
>> or setuptools apply to it)?
> 
> Sorry, bad wording on my part... I guess I meant more how would
> buildout/setuptools go about installing/uninstalling/etc packages
> thatconform to PEP 382? Would setuptools/buildout need modification or
> would the changes take effect lower down in the stack?

Unfortunately, I don't know precisely what they do, so I don't know
whether any of it needs modification.

All I can say is that if they want to install namespace packages
using the mechanism of PEP 382, they will have to produce the file
layout specified in the PEP.

For distutils (which is the only library in that area that I do know),
I think just installing any .pth files inside a package would be
sufficient.

Regards,
Martin


From benjamin.kaplan at case.edu  Sat May  9 10:35:42 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 9 May 2009 10:35:42 -0400
Subject: MacPython 3.0.1 installation problem, no /usr/local/bin/python*
In-Reply-To: <m2vdoad6fd.fsf@yahoo.co.uk>
References: <m2vdoad6fd.fsf@yahoo.co.uk>
Message-ID: <ec96e1390905090735p40bd6c21w5606c521c4c161e5@mail.gmail.com>

On Sat, May 9, 2009 at 4:30 AM, Raoul Gough <bvdmyrby at jyxk16274849.net>wrote:

> I just installed MacPython 3.0.1 (woot!) but the installer didn't seem
> to do an absolutely complete job. According to the ReadMe.txt, "The
> installer puts [...] command-line tools in /usr/local/bin [...]". This
> didn't happen - even after the install reported Success, there were no
> python files or symlinks under /usr/local/bin.
>
> Also, I'm guessing there should have been a symlink to the current
> version under /Library/Frameworks/Python.framework/Versions, which
> wasn't there either:
>
> $ cd /Library/Frameworks/Python.framework
> $ ls -l Python
> lrwxr-xr-x  1 root  admin  23 May  9 08:34 Python ->
> Versions/Current/Python
> $ ls -l Versions/Current
> ls: Versions/Current: No such file or directory
>
> So I fixed this all up as follows:
>
> $ cd /Library/Frameworks/Python.framework/Versions
> $ sudo ln -s 3.0 Current
> $ cd /usr/local/bin
> $ sudo ln -s $(find
> /Library/Frameworks/Python.framework/Versions/Current/bin -type f) .
>
> So did something go wrong with the installer, or is it all supposed to
> work somehow differently?
>

Because Python 3 breaks compatibility with Python 2, the installers don't
install it as the default. The executable should be at
/usr/local/bin/python3.0



>
> --
> Raoul Gough.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From pje at telecommunity.com  Sat May  9 10:41:02 2009
From: pje at telecommunity.com (P.J. Eby)
Date: Sat, 09 May 2009 10:41:02 -0400
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <4A0590C4.1020904@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
Message-ID: <20090509143829.17F293A4080@sparrow.telecommunity.com>

At 04:18 PM 5/9/2009 +0200, Martin v. L??wis wrote:
>Zooko O'Whielacronx wrote:
> > .pth files are why I can't easily use GNU stow with easy_install.
> > If installing a Python package involved writing new files into the
> > filesystem, but did not require reading, updating, and re-writing any
> > extant files such as .pth files, then GNU stow would Just Work with
> > easy_install the way it Just Works with most things.
>
>Please understand that this is the fault of easy_install, not of .pth
>files. There is no technical need for easy_install to rewrite .pth
>files on installation. It could just as well have created new .pth
>files, rather than modifying existing ones.
>
>If you always use --single-version-externally-managed with easy_install,
>it will stop editing .pth files on installation.

It's --multi-version (-m) that does 
that.  --single-version-externally-managed is a "setup.py install" option.

Both have the effect of not editing .pth files, but they do so in 
different ways.  The "setup.py install" option causes it to install 
in a distutils-compatible layout, whereas --multi-version simply 
drops .egg files or directories in the target location and leaves it 
to the user (or the generated script wrappers) to add them to sys.path.



From martin at v.loewis.de  Sat May  9 10:42:01 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 09 May 2009 16:42:01 +0200
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <20090509143829.17F293A4080@sparrow.telecommunity.com>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
Message-ID: <4A059639.7040505@v.loewis.de>

>> If you always use --single-version-externally-managed with easy_install,
>> it will stop editing .pth files on installation.
> 
> It's --multi-version (-m) that does that. 
> --single-version-externally-managed is a "setup.py install" option.
> 
> Both have the effect of not editing .pth files, but they do so in
> different ways.  The "setup.py install" option causes it to install in a
> distutils-compatible layout, whereas --multi-version simply drops .egg
> files or directories in the target location and leaves it to the user
> (or the generated script wrappers) to add them to sys.path.

Ah, ok. Is there also an easy_install invocation that unpacks the zip
file into some location of sys.path (which then wouldn't require
editing sys.path)?

Regards,
Martin


From ben+python at benfinney.id.au  Sat May  9 11:00:51 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 10 May 2009 01:00:51 +1000
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
Message-ID: <87zldmcod8.fsf@benfinney.id.au>

Tobias Weber <towb at gmx.net> writes:

> Or are there editors that can do a "soft hard wrap" while keeping 
> indentation and #comment markers intact?

Yes. Both Emacs and Vim will do exactly this when re-wrapping a
paragraph of commented lines, provided they have support for the
language's comment syntax (which, for Python, they do).

-- 
 \                            ?Only the educated are free.? ?Epictetus |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From cdalten at gmail.com  Sat May  9 11:20:12 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sat, 9 May 2009 08:20:12 -0700 (PDT)
Subject: Thread locking question.
Message-ID: <30763887-0b49-47c7-b4c2-76892024b36a@d38g2000prn.googlegroups.com>

The following code gets data from 5 different websites at the "same
time".

#!/usr/bin/python

import Queue
import threading
import urllib2
import time

hosts = ["http://yahoo.com", "http://google.com", "http://amazon.com",
         "http://ibm.com", "http://apple.com"]

queue = Queue.Queue()

class MyUrl(threading.Thread):
    def __init__(self, queue):
        threading.Thread.__init__(self)
        self.queue = queue

    def run(self):
        while True:
            host = self.queue.get()
            if host is None:
                break
            url = urllib2.urlopen(host)
            print url.read(1024)
            #self.queue.task_done()

start = time.time()

def main():
    for i in range(5):
        t = MyUrl(queue)
        t.setDaemon(True)
        t.start()

    for host in hosts:
        print "pushing", host
        queue.put(host)

    for i in range(5):
        queue.put(None)

    t.join()

if __name__ == "__main__":
    main()
    print "Elapsed Time: %s" % (time.time() - start)


How does the parallel download work if each thread has a lock? When
the program opens www.yahoo.com, it places a lock on the thread,
right? If so, then doesn't that mean the other 4 sites have to wait
for the thread to release the lock?


From jcd at sdf.lonestar.org  Sat May  9 11:26:53 2009
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Sat, 09 May 2009 11:26:53 -0400
Subject: unicode bit me
In-Reply-To: <977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
Message-ID: <1241882813.17260.0.camel@mctell>

You're still not asking questions in a way that we can answer them.

Define "Doesn't work."  Define "a".


On Sat, 2009-05-09 at 00:04 -0700, anuraguniyal at yahoo.com wrote:
> also not sure why (python 2.5)
> print a # works
> print unicode(a) # works
> print [a] # works
> print unicode([a]) # doesn't works
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From ebonak at hotmail.com  Sat May  9 11:30:02 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 09 May 2009 11:30:02 -0400
Subject: need help with properties
Message-ID: <gu47hq$6dg$1@ger.gmane.org>

Hi,

I am just reading about properties in Python. I am thinking
of this as an indirection mechanism, is that wrong? If so, how
come the getter/setters aren't called when I use properties
instead of the functions directly?

What am I missing here? I have a feeling I am overlooking
something simple here...

Thanks,
Esmail

---
#!/usr/bin/env python

#
# quick test to deal with 'private' attributes and
# python properties ...
#

import sys

class Rectangle(object):

     def __init__(self):
         self.__width = 0
         self.__height = 0


     def setSize(self, width, height):
         print 'in setter'
         if (width < 0) or (height < 0):
             print >> sys.stderr, 'Negative values not allowed'
         else:
             self.__width = width
             self.__height = height


     def getSize(self):
         print 'in getter'
         return self.__width, self.__height


     size = property(getSize, setSize)

r = Rectangle()
print r.getSize()
r.setSize(-40, 30)
print r.getSize()

print '-----------------'
size = 3, 7
print size

print '-----------------'
size = -3,7
print size



The program output:


in getter
(0, 0)
in setter
Negative values not allowed
in getter
(0, 0)
-----------------
(3, 7)
-----------------
(-3, 7)



From piet at cs.uu.nl  Sat May  9 11:36:21 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 09 May 2009 17:36:21 +0200
Subject: Thread locking question.
References: <30763887-0b49-47c7-b4c2-76892024b36a@d38g2000prn.googlegroups.com>
Message-ID: <m2ws8qgufe.fsf@cs.uu.nl>

>>>>> grocery_stocker <cdalten at gmail.com> (gs) wrote:

>gs> The following code gets data from 5 different websites at the "same
>gs> time".

>gs> #!/usr/bin/python

>gs> import Queue
>gs> import threading
>gs> import urllib2
>gs> import time

>gs> hosts = ["http://yahoo.com", "http://google.com", "http://amazon.com",
>gs>          "http://ibm.com", "http://apple.com"]

>gs> queue = Queue.Queue()

>gs> class MyUrl(threading.Thread):
>gs>     def __init__(self, queue):
>gs>         threading.Thread.__init__(self)
>gs>         self.queue = queue

>gs>     def run(self):
>gs>         while True:
>gs>             host = self.queue.get()
>gs>             if host is None:
>gs>                 break
>gs>             url = urllib2.urlopen(host)
>gs>             print url.read(1024)
>gs>             #self.queue.task_done()

>gs> start = time.time()

>gs> def main():
>gs>     for i in range(5):
>gs>         t = MyUrl(queue)
>gs>         t.setDaemon(True)
>gs>         t.start()

>gs>     for host in hosts:
>gs>         print "pushing", host
>gs>         queue.put(host)

>gs>     for i in range(5):
>gs>         queue.put(None)

>gs>     t.join()

>gs> if __name__ == "__main__":
>gs>     main()
>gs>     print "Elapsed Time: %s" % (time.time() - start)


>gs> How does the parallel download work if each thread has a lock? When
>gs> the program opens www.yahoo.com, it places a lock on the thread,
>gs> right? If so, then doesn't that mean the other 4 sites have to wait
>gs> for the thread to release the lock?

No. Where does it set a lock? There is only a short lock period in the queue
when an item is put in the queue or got from the queue. And of course we
have the GIL, but this is released as soon as a long during operation is
started - in this case when the Internet communication is done.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From steve at REMOVE-THIS-cybersource.com.au  Sat May  9 11:37:37 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 15:37:37 GMT
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
Message-ID: <02159679$0$20647$c3e8da3@news.astraweb.com>

On Sat, 09 May 2009 07:19:45 -0700, Scott David Daniels wrote:

> > So what if you hard wrap code but let comments and docstrings 
> > soft-wrap?
>
> You apparently have caught the soft-/hard- disease spread by several
> software retailers.  There are no such characters as "hard break," "soft
> break,"  "hard space,"  and "soft space."  Check you ASCII or Unicode
> standards if you disagree.  There is a "non-breaking space" in Unicode,
> but it doesn't mean what you mean.

You say that as if ASCII and Unicode are the only conceivable sets of 
characters.

Even if they are (and they're not), the OP didn't ask about inserting 
hard/soft *characters*. He asked about *actions*: hard-wrapping code and 
soft-wrapping comments. He does that (presumably) by inserting newline 
characters in code where he wants to force a new line, and telling his 
editor to wrap comments according to the editor's own algorithm 
(presumably some variation of the rule "if a line extends beyond the 
right-edge of the window, wrap it to the next line in the display, but do 
not insert a newline character"). This is not a disease, it is very 
useful when editing unstructured text. Believe it or not, text editors 
are not only useful for editing source code *wink*


[aside]
Personally, I think it is just a little bit sad that in 2009 we still 
write programs using editors which are character-based instead of token-
based and syntax-aware. At least good editors have syntax highlighting. 
Maybe in another 20 years, nobody will care about low-level details like 
the characters used to write code. Only the tokens really matter.
[/aside]


My own opinion is that if the OP is not sharing his code with anyone 
else, he can do whatever he likes. Nevertheless, there is value in 
sticking to the standards that the majority use, and so I tend to stick 
to a line length of 70 characters or less for both code and comments. I'm 
not religious about it though.



-- 
Steven


From anuraguniyal at yahoo.com  Sat May  9 11:37:59 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Sat, 9 May 2009 08:37:59 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl> 
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com> 
	<mailman.5338.1241882849.11746.python-list@python.org>
Message-ID: <994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>

Sorry being unclear again, hmm I am becoming an expert in it.

I pasted that code as continuation of my old code at start
i.e
 class A(object):
     def __unicode__(self):
         return u"?au"

     def __repr__(self):
         return unicode(self).encode("utf-8")
     __str__ = __repr__

doesn't work means throws unicode error
my question boils down to
what is diff between, why one doesn't throws error and another does
print unicode(a)
vs
print unicode([a])



From rylesny at gmail.com  Sat May  9 11:39:16 2009
From: rylesny at gmail.com (ryles)
Date: Sat, 9 May 2009 08:39:16 -0700 (PDT)
Subject: slice iterator?
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
Message-ID: <405bb614-28eb-469a-b490-2d38db901a8f@o27g2000vbd.googlegroups.com>

On May 8, 11:17?pm, Ross <ross.j... at gmail.com> wrote:
> I have a really long list that I would like segmented into smaller
> lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> a way to do this without explicitly defining new lists? If the above
> problem were to be split into groups of 3, I've tried something like:
>
> start = 0
> stop = 3
> for i in range(len(a)):
> ? ? segment = a[start:stop]
> ? ? print segment
> ? ? start += stop
> ? ? stop += stop
>
> Unfortunately start and stop don't increment using this code. Ideally,
> my outcome would be
> [1,2,3]
> [4,5,6]
> [7,8,9]
> [10,11,12]

There is also an iterator version here:
http://code.activestate.com/recipes/303279


From pje at telecommunity.com  Sat May  9 11:39:52 2009
From: pje at telecommunity.com (P.J. Eby)
Date: Sat, 09 May 2009 11:39:52 -0400
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <4A059639.7040505@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<4A059639.7040505@v.loewis.de>
Message-ID: <20090509153716.D44633A4080@sparrow.telecommunity.com>

At 04:42 PM 5/9/2009 +0200, Martin v. L?wis wrote:
> >> If you always use --single-version-externally-managed with easy_install,
> >> it will stop editing .pth files on installation.
> >
> > It's --multi-version (-m) that does that.
> > --single-version-externally-managed is a "setup.py install" option.
> >
> > Both have the effect of not editing .pth files, but they do so in
> > different ways.  The "setup.py install" option causes it to install in a
> > distutils-compatible layout, whereas --multi-version simply drops .egg
> > files or directories in the target location and leaves it to the user
> > (or the generated script wrappers) to add them to sys.path.
>
>Ah, ok. Is there also an easy_install invocation that unpacks the zip
>file into some location of sys.path (which then wouldn't require
>editing sys.path)?

Not as yet.  I'm sort of waiting to see what comes out of PEP 376 
discussions re: an installation manifest...  but then, if I actually 
had time to work on it right now, I'd probably just implement something.

Currently, you can use pip to do that, though, as long as the 
packages you want are in source form.  pip doesn't unzip eggs as yet.

It would be really straightforward, though, for someone to implement 
an easy_install variant that does this.  Just invoke "easy_install 
-Zmaxd /some/tmpdir packagelist" to get a full set of unpacked .egg 
directories in /some/tmpdir, and then move the contents of the 
resulting .egg subdirs to the target location, renaming EGG-INFO 
subdirs to projectname-version.egg-info subdirs.

(Of course, this ignores the issue of uninstalling previous versions, 
or overwriting of conflicting files in the target -- does pip handle these?)



From news.btinternet.com at erik.feegles.net  Sat May  9 11:41:59 2009
From: news.btinternet.com at erik.feegles.net (Basil Brush)
Date: Sat, 09 May 2009 16:41:59 +0100
Subject: Anyone familiar with python bittorrent?
Message-ID: <toadnVTiEoeeOZjXnZ2dnUVZ8qSdnZ2d@bt.com>

I was just looking at the bittorrent python code as I'm thinking of
combining it with some other stuff to expand it. Am I right in thinking
that bittorrent launches a new python process for every torrent you
download? That seems not good for what I want to do; if I've got 500
torrents I want to queue I don't want 500 processes running. Does anyone
know if bittorrent can resume a download if the process gets killed?


From Scott.Daniels at Acm.Org  Sat May  9 11:55:15 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 08:55:15 -0700
Subject: need help with properties
In-Reply-To: <mailman.5339.1241883021.11746.python-list@python.org>
References: <mailman.5339.1241883021.11746.python-list@python.org>
Message-ID: <OKadndJuq-ezO5jXnZ2dnUVZ_o6dnZ2d@pdx.net>

Esmail wrote:
> I am just reading about properties in Python. I am thinking
> of this as an indirection mechanism, is that wrong? If so, how
> come the getter/setters aren't called when I use properties
> instead of the functions directly?
Because you weren't actually using them.  You were writing:
     size = 3, 7
not:
     r.size = 3, 7
Try:
     class Rectangle(object):
         def __init__(self):
             self._width = 0 # use single underscore unless you
             self._height = 0 # have a serious reason for __x
         def setSize(self, shape): # a setter takes a single arg
             width, height = shape
             print 'in setter'
             if width < 0 or height < 0:
                 print >> sys.stderr, 'Negative values not allowed'
             else:
                 self._width = width
                 self._height = height
         def getSize(self):
             print 'in getter'
             return self._width, self._height
         size = property(getSize, setSize)

     r = Rectangle()
     print r.getSize()
     r.setSize((-40, 30))
     print r.getSize()
     print '-----------------'
     r.size = 3, 7
     print r.size
     print '-----------------'
     r.size = -3,7
     print r.size

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at REMOVE-THIS-cybersource.com.au  Sat May  9 11:56:37 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 15:56:37 GMT
Subject: need help with properties
References: <mailman.5339.1241883021.11746.python-list@python.org>
Message-ID: <02159aed$0$20647$c3e8da3@news.astraweb.com>

On Sat, 09 May 2009 11:30:02 -0400, Esmail wrote:

> Hi,
> 
> I am just reading about properties in Python. I am thinking of this as
> an indirection mechanism, is that wrong? If so, how come the
> getter/setters aren't called when I use properties instead of the
> functions directly?
> 
> What am I missing here? I have a feeling I am overlooking something
> simple here...

Sure are.

In your test code, you have:

> r = Rectangle()
> print r.getSize()
> r.setSize(-40, 30)
> print r.getSize()
> 
> print '-----------------'
> size = 3, 7
> print size

All you've done in this second block is define a new object called "size" 
and assign the tuple (3, 7) to it. [Aside: you might not be aware that it 
is commas that make tuples, not brackets. The brackets are for grouping.)

"size" has nothing to do with your Rectangle class, or the property. 
Apart from the accidental similarity of name between "Rectangle.size" and 
"size", it's unrelated to the property you created.

What you probably intended to do was this:

print '-----------------'
r.size = 3, 7
print r.size


In other words, your property is attached to the Rectangle instance.



-- 
Steven


From google at mrabarnett.plus.com  Sat May  9 11:57:11 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 09 May 2009 16:57:11 +0100
Subject: Thread locking question.
In-Reply-To: <m2ws8qgufe.fsf@cs.uu.nl>
References: <30763887-0b49-47c7-b4c2-76892024b36a@d38g2000prn.googlegroups.com>
	<m2ws8qgufe.fsf@cs.uu.nl>
Message-ID: <4A05A7D7.6050208@mrabarnett.plus.com>

Piet van Oostrum wrote:
>>>>>> grocery_stocker <cdalten at gmail.com> (gs) wrote:
> 
>> gs> The following code gets data from 5 different websites at the "same
>> gs> time".
> 
[snip]
>> gs> start = time.time()
> 
>> gs> def main():
>> gs>     for i in range(5):
>> gs>         t = MyUrl(queue)
>> gs>         t.setDaemon(True)
>> gs>         t.start()
> 
>> gs>     for host in hosts:
>> gs>         print "pushing", host
>> gs>         queue.put(host)
> 
>> gs>     for i in range(5):
>> gs>         queue.put(None)
> 
>> gs>     t.join()
> 
>> gs> if __name__ == "__main__":
>> gs>     main()
>> gs>     print "Elapsed Time: %s" % (time.time() - start)
> 
> 
>> gs> How does the parallel download work if each thread has a lock? When
>> gs> the program opens www.yahoo.com, it places a lock on the thread,
>> gs> right? If so, then doesn't that mean the other 4 sites have to wait
>> gs> for the thread to release the lock?
> 
> No. Where does it set a lock? There is only a short lock period in the queue
> when an item is put in the queue or got from the queue. And of course we
> have the GIL, but this is released as soon as a long during operation is
> started - in this case when the Internet communication is done.

Also, the code is creating 5 threads, but using join() on only the last
one.


From cdalten at gmail.com  Sat May  9 12:02:17 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sat, 9 May 2009 09:02:17 -0700 (PDT)
Subject: Thread locking question.
References: <30763887-0b49-47c7-b4c2-76892024b36a@d38g2000prn.googlegroups.com>
	<m2ws8qgufe.fsf@cs.uu.nl>
Message-ID: <d0d48afe-0f38-4dd5-b3dd-2827b57844e4@i28g2000prd.googlegroups.com>

On May 9, 8:36 am, Piet van Oostrum <p... at cs.uu.nl> wrote:
> >>>>> grocery_stocker <cdal... at gmail.com> (gs) wrote:
> >gs> The following code gets data from 5 different websites at the "same
> >gs> time".
> >gs> #!/usr/bin/python
> >gs> import Queue
> >gs> import threading
> >gs> import urllib2
> >gs> import time
> >gs> hosts = ["http://yahoo.com", "http://google.com", "http://amazon.com",
> >gs>          "http://ibm.com", "http://apple.com"]
> >gs> queue = Queue.Queue()
> >gs> class MyUrl(threading.Thread):
> >gs>     def __init__(self, queue):
> >gs>         threading.Thread.__init__(self)
> >gs>         self.queue = queue
> >gs>     def run(self):
> >gs>         while True:
> >gs>             host = self.queue.get()
> >gs>             if host is None:
> >gs>                 break
> >gs>             url = urllib2.urlopen(host)
> >gs>             print url.read(1024)
> >gs>             #self.queue.task_done()
> >gs> start = time.time()
> >gs> def main():
> >gs>     for i in range(5):
> >gs>         t = MyUrl(queue)
> >gs>         t.setDaemon(True)
> >gs>         t.start()
> >gs>     for host in hosts:
> >gs>         print "pushing", host
> >gs>         queue.put(host)
> >gs>     for i in range(5):
> >gs>         queue.put(None)
> >gs>     t.join()
> >gs> if __name__ == "__main__":
> >gs>     main()
> >gs>     print "Elapsed Time: %s" % (time.time() - start)
> >gs> How does the parallel download work if each thread has a lock? When
> >gs> the program openswww.yahoo.com, it places a lock on the thread,
> >gs> right? If so, then doesn't that mean the other 4 sites have to wait
> >gs> for the thread to release the lock?
>
> No. Where does it set a lock? There is only a short lock period in the queue
> when an item is put in the queue or got from the queue. And of course we
> have the GIL, but this is released as soon as a long during operation is
> started - in this case when the Internet communication is done.
> --

Maybe I'm being a bit daft, but what prevents the data from www.yahoo.com
from being mixed up with the data from www.google.com? Doesn't using
queue() prevent the data from being mixed up?



From ebonak at hotmail.com  Sat May  9 12:05:33 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 09 May 2009 12:05:33 -0400
Subject: need help with properties
In-Reply-To: <OKadndJuq-ezO5jXnZ2dnUVZ_o6dnZ2d@pdx.net>
References: <mailman.5339.1241883021.11746.python-list@python.org>
	<OKadndJuq-ezO5jXnZ2dnUVZ_o6dnZ2d@pdx.net>
Message-ID: <4A05A9CD.3010001@hotmail.com>

hi Scott,

Scott David Daniels wrote:
> Esmail wrote:
>> I am just reading about properties in Python. I am thinking
>> of this as an indirection mechanism, is that wrong? If so, how
>> come the getter/setters aren't called when I use properties
>> instead of the functions directly?
> Because you weren't actually using them.  You were writing:
>     size = 3, 7
> not:
>     r.size = 3, 7

duh!! .. I knew it had to be something sill .. how do I represent
a red face in ASCII ? ;) I was concentrating so much on the new
feature I totally didn't see this.

I appreciate your code with annotations, helpful.

>         def setSize(self, shape): # a setter takes a single arg
>             width, height = shape
>             print 'in setter'
>             if width < 0 or height < 0:
>                 print >> sys.stderr, 'Negative values not allowed'
>             else:
>                 self._width = width
>                 self._height = height

>     r.setSize((-40, 30))

Just curious, is there a way to pass more than one arg to a setter, or
do we always have use some sort of unpacking at the other end?

Thanks,

Esmail



From steve at REMOVE-THIS-cybersource.com.au  Sat May  9 12:08:37 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 16:08:37 GMT
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
Message-ID: <02159dbd$0$20647$c3e8da3@news.astraweb.com>

On Sat, 09 May 2009 08:37:59 -0700, anuraguniyal at yahoo.com wrote:

> Sorry being unclear again, hmm I am becoming an expert in it.
> 
> I pasted that code as continuation of my old code at start i.e
>  class A(object):
>      def __unicode__(self):
>          return u"?au"
> 
>      def __repr__(self):
>          return unicode(self).encode("utf-8")
>      __str__ = __repr__
> 
> doesn't work means throws unicode error my question 

What unicode error?

Stop asking us to GUESS what the error is, and please copy and paste the 
ENTIRE TRACEBACK that you get. When you ask for free help, make it easy 
for the people trying to help you. If you expect them to copy and paste 
your code and run it just to answer the smallest questions, most of them 
won't bother.




-- 
Steven


From ebonak at hotmail.com  Sat May  9 12:08:58 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 09 May 2009 12:08:58 -0400
Subject: need help with properties
In-Reply-To: <02159aed$0$20647$c3e8da3@news.astraweb.com>
References: <mailman.5339.1241883021.11746.python-list@python.org>
	<02159aed$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <4A05AA9A.3000105@hotmail.com>

Steven D'Aprano wrote:
> 
> All you've done in this second block is define a new object called "size" 
> and assign the tuple (3, 7) to it. 

oops .. yes, you are right, and I am embarrassed...

[Aside: you might not be aware that it
> is commas that make tuples, not brackets. The brackets are for grouping.)

Helpful clarification, thanks!

> "size" has nothing to do with your Rectangle class, or the property. 
> Apart from the accidental similarity of name between "Rectangle.size" and 
> "size", it's unrelated to the property you created.
> 
> What you probably intended to do was this:
> 
> print '-----------------'
> r.size = 3, 7
> print r.size

Yup, I know Python is a dynamically typed language, but I wish it would
point this sort of silliness out .. but there are tradeoffs. I should
probably run pyflakes/pychecker/pylint on my my tiny test/try out codes
too.

Best,
Esmail



From socyl at 987jk.com.invalid  Sat May  9 12:09:38 2009
From: socyl at 987jk.com.invalid (kj)
Date: Sat, 9 May 2009 16:09:38 +0000 (UTC)
Subject: ISO exemplary Python scripts
References: <gu2j3n$a90$1@reader1.panix.com>
	<802a051qoqmpnih0j2su9hhriqumagu326@4ax.com>
Message-ID: <gu49s1$g84$1@reader1.panix.com>

In <802a051qoqmpnih0j2su9hhriqumagu326 at 4ax.com> Tim Roberts <timr at probo.com> writes:

>kj <socyl at 987jk.com.invalid> wrote:
>>
>>I'm learning python, for the umpteenth time.  This time I decided
>>to start out by writing Python scripts for everyday tasks.  Most
>>of these scripts are meant to be used only once or twice, but a
>>few of them have become useful enough that I'd like to make them
>>a little bit more solid...
>>
>>I'd like to learn from well-written Python scripts, with well-structured
>>options parsing, good error and help messages, clear organization,
>>etc.
>>
>>Can someone point me to good examples of Python scripts?

>The standard library that was installed with your interpreter is one of the
>best repositories.  It contains hundreds of working, well-tested scripts,
>most of which have the ability to run by themselves.

Thanks, but the last bit of your post ("...most of which have the
ability to run by themselves") makes me wonder whether we mean the
same thing when we talk of "scripts."  Can you give me an example
of a script that *does not* have the ability to run by itself?
When I use the word "script" I mean, *by definition*, a piece of
code that has the ability to run by itself.

I know that in the python world the distinction between a script
and a (library) module is not so clear-cut, and it is common for
library modules to have "top-level" stuff (typically test code)
that gets run if the module is invoked directly from the command
line.  But this is not *really* a script as I understand it, because,
even though it "runs" directly from the command-line, it lacks the
typical CLI amenities, such as command-line flags, help messages,
diagnostic messages that are aimed to the "naive user" (i.e. as
opposed to the developer), etc.  The coding of these "CLI amenities"
is one of aspects of these "exemplary Python scripts" I'm most
interested in learning about.

Anyway, thanks, I'll poke around in the standard library...

kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From chambon.pascal at wanadoo.fr  Sat May  9 12:32:41 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Sat, 09 May 2009 18:32:41 +0200
Subject: Thread locking question.
In-Reply-To: <d0d48afe-0f38-4dd5-b3dd-2827b57844e4@i28g2000prd.googlegroups.com>
References: <30763887-0b49-47c7-b4c2-76892024b36a@d38g2000prn.googlegroups.com>	<m2ws8qgufe.fsf@cs.uu.nl>
	<d0d48afe-0f38-4dd5-b3dd-2827b57844e4@i28g2000prd.googlegroups.com>
Message-ID: <4A05B029.1090009@wanadoo.fr>

grocery_stocker a ?crit :
> On May 9, 8:36 am, Piet van Oostrum <p... at cs.uu.nl> wrote:
>   
>>>>>>> grocery_stocker <cdal... at gmail.com> (gs) wrote:
>>>>>>>               
>>> gs> The following code gets data from 5 different websites at the "same
>>> gs> time".
>>> gs> #!/usr/bin/python
>>> gs> import Queue
>>> gs> import threading
>>> gs> import urllib2
>>> gs> import time
>>> gs> hosts = ["http://yahoo.com", "http://google.com", "http://amazon.com",
>>> gs>          "http://ibm.com", "http://apple.com"]
>>> gs> queue = Queue.Queue()
>>> gs> class MyUrl(threading.Thread):
>>> gs>     def __init__(self, queue):
>>> gs>         threading.Thread.__init__(self)
>>> gs>         self.queue = queue
>>> gs>     def run(self):
>>> gs>         while True:
>>> gs>             host = self.queue.get()
>>> gs>             if host is None:
>>> gs>                 break
>>> gs>             url = urllib2.urlopen(host)
>>> gs>             print url.read(1024)
>>> gs>             #self.queue.task_done()
>>> gs> start = time.time()
>>> gs> def main():
>>> gs>     for i in range(5):
>>> gs>         t = MyUrl(queue)
>>> gs>         t.setDaemon(True)
>>> gs>         t.start()
>>> gs>     for host in hosts:
>>> gs>         print "pushing", host
>>> gs>         queue.put(host)
>>> gs>     for i in range(5):
>>> gs>         queue.put(None)
>>> gs>     t.join()
>>> gs> if __name__ == "__main__":
>>> gs>     main()
>>> gs>     print "Elapsed Time: %s" % (time.time() - start)
>>> gs> How does the parallel download work if each thread has a lock? When
>>> gs> the program openswww.yahoo.com, it places a lock on the thread,
>>> gs> right? If so, then doesn't that mean the other 4 sites have to wait
>>> gs> for the thread to release the lock?
>>>       
>> No. Where does it set a lock? There is only a short lock period in the queue
>> when an item is put in the queue or got from the queue. And of course we
>> have the GIL, but this is released as soon as a long during operation is
>> started - in this case when the Internet communication is done.
>> --
>>     
>
> Maybe I'm being a bit daft, but what prevents the data from www.yahoo.com
> from being mixed up with the data from www.google.com? Doesn't using
> queue() prevent the data from being mixed up?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
>   
Hello

Each thread has a separate access to internet (its own TCP/IP 
connection, port number etc.), so the incoming data will never get mixed 
between the thread on the input.

The only problem is when you explicitly use shared data structures be 
the threads - like the queue here that they all access.
But the queue is protected against multithreading so there is no problem 
there (another data structure might give bugs, if not explicitly locked 
before use).

On the contarry, there will be mixes on the console (stdout), since each 
thread can write to it at any moment. It's likely that the sources of 
all the pages will get mixed, on your screen, yep. ^^

Regards,
pascal
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From rurpy at yahoo.com  Sat May  9 12:41:45 2009
From: rurpy at yahoo.com (rurpy at yahoo.com)
Date: Sat, 9 May 2009 09:41:45 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl> 
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com> 
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<02159dbd$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <d10cfde6-7550-4fa7-8c6b-6ded066fb35c@n4g2000vba.googlegroups.com>

On May 9, 10:08 am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sat, 09 May 2009 08:37:59 -0700, anuraguni... at yahoo.com wrote:
> > Sorry being unclear again, hmm I am becoming an expert in it.
>
> > I pasted that code as continuation of my old code at start i.e
> >  class A(object):
> >      def __unicode__(self):
> >          return u"?au"
>
> >      def __repr__(self):
> >          return unicode(self).encode("utf-8")
> >      __str__ = __repr__
>
> > doesn't work means throws unicode error my question
>
> What unicode error?
>
> Stop asking us to GUESS what the error is, and please copy and paste the
> ENTIRE TRACEBACK that you get. When you ask for free help, make it easy
> for the people trying to help you. If you expect them to copy and paste
> your code and run it just to answer the smallest questions, most of them
> won't bother.
>
> --
> Steven

Creua H Jiest!

It took me less then 45 seconds to open a terminal window, start
Python, and paste the OPs code to get:
>>> class A(object):
...      def __unicode__(self):
...          return u"?au"
...      def __repr__(self):
...          return unicode(self).encode("utf-8")
...      __str__ = __repr__
...
>>> print unicode(a)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'a' is not defined
>>> a=A()
>>> print unicode(a)
?au
>>> print unicode([a])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
1: ordinal not in range(128)

Which is the same error he had already posted!

I am all for encouraging posters to provide a good description
but let's not be ridiculous.

Anecdote:
My sister always gives her dogs the table scraps after eating
dinner.  One day when I ate there, I tossed the dogs a piece
of meat I hadn't eaten.  "No", she cried!  "You mustn't give
him anything without making him do a trick first!  Otherwise
he'll forget that you are the boss!".


From M8R-gqmgb4 at mailinator.com  Sat May  9 12:42:34 2009
From: M8R-gqmgb4 at mailinator.com (uuid)
Date: Sat, 9 May 2009 18:42:34 +0200
Subject: Get multiprocessing.Queue to do priorities
Message-ID: <4a05b27a_2@news.arcor-ip.de>

Hello,
I was wondering whether there was a way to make multiprocessing.Queue 
behave in a priority queue-like fashion. Subclassing with heappush and 
heappop for put and get doesn't work the old way (multiprocessing.Queue 
seems to use different data structures than Queue.Queue?)

Could one create a heapq within the producer as a proxy, and then feed 
a proper queue from that? Does anyone have an idea on how to deal with 
the queue item flow control? (Since all of the sorting has to happen 
within the heapq, it should only pass items to the real Queue if it's 
empty?)

Thanks in advance!



From jass.zhao at gmail.com  Sat May  9 12:44:22 2009
From: jass.zhao at gmail.com (Gnep)
Date: Sat, 9 May 2009 09:44:22 -0700 (PDT)
Subject: Frozen executable to load external python code at the runtime
Message-ID: <b5200bdc-0353-4072-bbf1-09b9c2e28c3c@d19g2000prh.googlegroups.com>


Hi, all,

Just curious whether I can do the following:

1. My python source code will dynamically load and run external python
scripts;
2. I need to compile the source code to the executable using freeze;
3. Is the executable still able to load&run the scripts?
4. If cannot, is it possible to  freeze the scripts into .so and load
the .so library with dlopen?

BR,
Gnep


From Scott.Daniels at Acm.Org  Sat May  9 12:51:24 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 09:51:24 -0700
Subject: heapq.merge with key=
In-Reply-To: <gu3dni$tkj$00$1@news.t-online.com>
References: <gtvjgk$tm8$1@foggy.unx.sas.com>
	<mailman.5264.1241758129.11746.python-list@python.org>
	<gu1gpj$nue$1@foggy.unx.sas.com>
	<gu3dni$tkj$00$1@news.t-online.com>
Message-ID: <nZCdnXZ109XKLpjXnZ2dnUVZ_ridnZ2d@pdx.net>

Peter Otten wrote:
> Kevin D.  Smith wrote:
> 
>> On 2009-05-07 23:48:43 -0500, Chris Rebert <clp2 at rebertia.com> said:
>>
>>> On Thu, May 7, 2009 at 2:23 PM, Kevin D. Smith <Kevin.Smith at sas.com>
>>> wrote:
>>>> I need the behavior of heapq.merge to merge a bunch of results from a
>>>> database.... I would prefer to do this with generators....  I need
>>>> the key argument to sort on the correct field in the database...
>>> I think so.... [some code]
>> Ah, that's not a bad idea.  I think it could be simplified by letting
>> Python do the comparison work as follows (also untested).
>>
>> def keyify(gen, key=lamda x:x):
>>     for item in gen:
>>         yield (key(item), item)
> ... This is not as general. It makes sorting unstable and can even fail 
> if the items are unorderable:
> One way to fix it:
>>>> def decorate(gen, key):
> ...     for index, item in enumerate(gen):
> ...             yield key(item), index, item
>>>> sorted(decorate([1j, -1j, 1+1j], key=lambda c: c.real))
> [(0.0, 0, 1j), (0.0, 1, -1j), (1.0, 2, (1+1j))]
>>>> list(undecorate(_))
> [1j, -1j, (1+1j)]

However, a heap gets faster if equal items are equal, so you
really want the decorated value to be the sole component of a
comparison.  (and remember, sorts are now stable).
As in your code, key generation is likely best calculated once.
Here's another fix:

     class Keyed(object):
         def __init__(self, obj, key):
             self.obj = obj
             self.key = key

         def __lt__(self, other): # cmp is old-style magic
             return self.key < other.key

         def __eq__(self, other):
             return self.key == other.key

         def __repr__(self):
             return '%s(%r, %r)' % (
		self.__class__.__name__, self.obj, self.key)

     def kmerge(key, *streams):
         keyed_streams = [(Keyed(obj, key(obj)) for obj in stream)
                          for stream in streams]
         for element in heapq.merge(*keyed_streams):
             yield element.obj

--Scott David Daniels
Scott.Daniels at Acm.Org


From M8R-gqmgb4 at mailinator.com  Sat May  9 13:00:54 2009
From: M8R-gqmgb4 at mailinator.com (uuid)
Date: Sat, 9 May 2009 19:00:54 +0200
Subject: Get multiprocessing.Queue to do priorities
References: <4a05b27a_2@news.arcor-ip.de>
Message-ID: <4a05b6c6_2@news.arcor-ip.de>

I just read up and it seems that no matter the approach, it's futile to 
use multiprocessing.Queue, since there is a bug that prevents true 
FIFO. (http://bugs.python.org/issue4999)

Any recommendation on an alternate way to build a priority queue to use 
with a "one producer, many consumers" type multiprocessing setup would 
be welcomed!

:|

On 2009-05-09 18:42:34 +0200, uuid <M8R-gqmgb4 at mailinator.com> said:

> Hello,
> I was wondering whether there was a way to make multiprocessing.Queue 
> behave in a priority queue-like fashion. Subclassing with heappush and 
> heappop for put and get doesn't work the old way (multiprocessing.Queue 
> seems to use different data structures than Queue.Queue?)
> 
> Could one create a heapq within the producer as a proxy, and then feed 
> a proper queue from that? Does anyone have an idea on how to deal with 
> the queue item flow control? (Since all of the sorting has to happen 
> within the heapq, it should only pass items to the real Queue if it's 
> empty?)
> 
> Thanks in advance!




From Scott.Daniels at Acm.Org  Sat May  9 13:39:50 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 10:39:50 -0700
Subject: unicode bit me
In-Reply-To: <d10cfde6-7550-4fa7-8c6b-6ded066fb35c@n4g2000vba.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<02159dbd$0$20647$c3e8da3@news.astraweb.com>
	<d10cfde6-7550-4fa7-8c6b-6ded066fb35c@n4g2000vba.googlegroups.com>
Message-ID: <e7GdnWQoj8AsI5jXnZ2dnUVZ_qydnZ2d@pdx.net>

rurpy at yahoo.com wrote:
> On May 9, 10:08 am, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> On Sat, 09 May 2009 08:37:59 -0700, anuraguni... at yahoo.com wrote:
>>> Sorry being unclear again, hmm I am becoming an expert in it.
>>> I pasted that code as continuation of my old code at start i.e
>>>  class A(object):
>>>      def __unicode__(self):
>>>          return u"?au"
>>>      def __repr__(self):
>>>          return unicode(self).encode("utf-8")
>>>      __str__ = __repr__
>>> doesn't work means throws unicode error my question
>> What unicode error?
>>
>> Stop asking us to GUESS what the error is, and please copy and paste the
>> ENTIRE TRACEBACK that you get. When you ask for free help, make it easy
>> for the people trying to help you. If you expect them to copy and paste
>> your code and run it just to answer the smallest questions, most of them
>> won't bother.

> It took me less then 45 seconds to open a terminal window, start
> Python, and paste the OPs code to get:
>>>> class A(object):
> ...      def __unicode__(self):
> ...          return u"?au"
> ...      def __repr__(self):
> ...          return unicode(self).encode("utf-8")
> ...      __str__ = __repr__
> ...
>>>> print unicode(a)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> NameError: name 'a' is not defined
>>>> a=A()
>>>> print unicode(a)
> ?au
>>>> print unicode([a])
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
> 1: ordinal not in range(128)
> 
> Which is the same error he had already posted!

It is _not_clear_ that is what was going on.
Your 45 seconds could have been his 45 seconds.
He was describing results rather than showing them.

 From your demo, I get to:
    unicode(u'\N{COPYRIGHT SIGN}au'.encode('utf-8'))
raises an exception (which it should).
    unicode(u'\N{COPYRIGHT SIGN}au'.encode('utf-8'), 'utf-8')
Does _not_ raise an exception (as it should not).
Note that his __repr__ produces characters which are not ASCII.
So, str or repr of a list containing those elements will also
be non-ascii.  To convert non-ASCII strings to unicode, you must
specify a character encoding.

The object a (created with A()) can be converted directly to
unicode (via its unicode method).  No problem.
The object A() may have its repr taken, which is a (non-unicode)
string which is not ASCII.  But you cannot take unicode(repr(a)),
because repr(a) contains a character > '\x7f'.
What he was trying to do was masking the issue.  Imagine:

     class B(object):
         def __unicode__(self):
             return u'one'
         def __repr__(self):
             return 'two'
         def __str__(self):
             return 'three'

     b = B()
     print b, unicode(b), [b]

By the way, pasting code with non-ASCII characters does not mean
your recipient will get the characters you pasted.

--Scott David Daniels
Scott.Daniels at Acm.Org


From paul at boddie.org.uk  Sat May  9 13:40:42 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Sat, 9 May 2009 10:40:42 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
Message-ID: <12ef7b00-f0c5-4030-a353-533d93d23cdd@r3g2000vbp.googlegroups.com>

On 9 Mai, 01:36, dpapathanasiou <denis.papathanas... at gmail.com> wrote:
>
> Apache's configure utility (I'm using httpd version 2.2.11) doesn't
> explicitly describe an expat library option.
>
> Also, if libexpat is version 1.95.2, wouldn't I have to get version
> 2.0 to be compatible with pyexpat?

The aim would be to persuade Apache to configure itself against the
same Expat library that pyexpat is using, which would involve the
headers and libraries referenced during the pyexpat configuration
process, although I seem to recall something about pyexpat bundling
its own version of Expat - that would complicate matters somewhat.

> If anyone has any advice or suggestions, I'd appreciate hearing them.

Expat might be getting brought into Apache via mod_dav:

http://www.webdav.org/mod_dav/install.html

Perhaps disabling mod_dav when configuring Apache might drop Expat
from Apache's library dependencies.

Paul


From namekuseijin.nospam at gmail.com  Sat May  9 13:46:43 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Sat, 09 May 2009 14:46:43 -0300
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <gu31sj$mk8$2@lust.ihug.co.nz>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net> <gu29cb$8gg$1@lust.ihug.co.nz>
	<692b7ae8-0c5b-498a-a012-51bda980f3b9@s28g2000vbp.googlegroups.com>
	<gu31sj$mk8$2@lust.ihug.co.nz>
Message-ID: <gu4esf$114e$1@adenine.netfront.net>

Lawrence D'Oliveiro wrote:
> In message <692b7ae8-0c5b-498a-
> a012-51bda980f3b9 at s28g2000vbp.googlegroups.com>, namekuseijin wrote:
> 
>> On May 8, 6:48 pm, Lawrence D'Oliveiro <l... at geek-
>> central.gen.new_zealand> wrote:
>>> In message <gu269i$16i... at adenine.netfront.net>, namekuseijin wrote:
>>>
>>>> Carl Banks escreveu:
>>>>> 2. However, functional programming is cryptic at some level no matter
>>>>> how nice you make the syntax.
>>>> When your program is nothing but function definition and function
>>>> application, syntax is meaningless.
>>> On the contrary, syntax is vital to the correct interpretation of
>>> functional constructs. See, for example,
>>> <http://mail.python.org/pipermail/python-list/2008-October/683816.html>.
>> Yeah, it's important in an imperative language ...
> 
> That was an example of functional programming.

I noticed the use of list comprehensions.  The fact that list 
comprehensions are only available as predefined syntax in Python is 
noticed too.


From Scott.Daniels at Acm.Org  Sat May  9 13:51:56 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 10:51:56 -0700
Subject: need help with properties
In-Reply-To: <mailman.5341.1241885153.11746.python-list@python.org>
References: <mailman.5339.1241883021.11746.python-list@python.org>	<OKadndJuq-ezO5jXnZ2dnUVZ_o6dnZ2d@pdx.net>
	<mailman.5341.1241885153.11746.python-list@python.org>
Message-ID: <28KdnTscUpwaXJjXnZ2dnUVZ_sudnZ2d@pdx.net>

Esmail wrote:
> Just curious, is there a way to pass more than one arg to a setter, or
> do we always have use some sort of unpacking at the other end?

Think about the source for a setter.  it comes from:
     <expr>.name = <expr>
You could add optional args, but the option would never be taken.
If you never intend to move to the 3.X versions of Python, you
code define the function as:

     def setter(self, (height, width)):
         ...

but since introspecting such things to give nice tracebacks and
good help messages drastically complicates the internal python
structure, and since the facility is so fraught with traps for
newbies, who might want to ask for, for example:
     def setter(self, (height=4, width=3)):

the Python 3.X world is wisely losing the unpacking in parameter
passing trick.

--Scott David Daniels
Scott.Daniels at Acm.Org



From ebonak at hotmail.com  Sat May  9 13:53:10 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 09 May 2009 13:53:10 -0400
Subject: need help with properties
In-Reply-To: <28KdnTscUpwaXJjXnZ2dnUVZ_sudnZ2d@pdx.net>
References: <mailman.5339.1241883021.11746.python-list@python.org>	<OKadndJuq-ezO5jXnZ2dnUVZ_o6dnZ2d@pdx.net>	<mailman.5341.1241885153.11746.python-list@python.org>
	<28KdnTscUpwaXJjXnZ2dnUVZ_sudnZ2d@pdx.net>
Message-ID: <4A05C306.3060203@hotmail.com>

Scott David Daniels wrote:
> 
<... good stuff ... >
> 
> the Python 3.X world is wisely losing the unpacking in parameter
> passing trick.

Thanks Scott, useful information,

Esmail



From emile at fenx.com  Sat May  9 13:53:31 2009
From: emile at fenx.com (Emile van Sebille)
Date: Sat, 09 May 2009 10:53:31 -0700
Subject: slice iterator?
In-Reply-To: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
Message-ID: <gu4fus$ru6$1@ger.gmane.org>

On 5/8/2009 8:17 PM Ross said...
> I have a really long list that I would like segmented into smaller
> lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> a way to do this without explicitly defining new lists? 

 >>> a = [1,2,3,4,5,6,7,8,9,10,11,12]
 >>>
 >>> for k in [2,3,4,5,6]:
...     print [ a[j:j+k] for j in range(0,len(a),k) ]
...
[[1, 2], [3, 4], [5, 6], [7, 8], [9, 10], [11, 12]]
[[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]
[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]]
[[1, 2, 3, 4, 5], [6, 7, 8, 9, 10], [11, 12]]
[[1, 2, 3, 4, 5, 6], [7, 8, 9, 10, 11, 12]]

The point is of course to use the form a[j:j+k] which doesn't create new 
lists.

Emile



From Scott.Daniels at Acm.Org  Sat May  9 13:56:44 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 10:56:44 -0700
Subject: Get multiprocessing.Queue to do priorities
In-Reply-To: <4a05b6c6_2@news.arcor-ip.de>
References: <4a05b27a_2@news.arcor-ip.de> <4a05b6c6_2@news.arcor-ip.de>
Message-ID: <28KdnTocUpw2X5jXnZ2dnUVZ_sudnZ2d@pdx.net>

uuid wrote:
> Any recommendation on an alternate way to build a priority queue to use 
> with a "one producer, many consumers" type multiprocessing setup would 
> be welcomed!

? "one producer, many consumers" ?
What would the priority queue do?  Choose a consumer?

--Scott David Daniels
Scott.Daniels at Acm.Org


From namekuseijin.nospam at gmail.com  Sat May  9 13:57:24 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Sat, 09 May 2009 14:57:24 -0300
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
Message-ID: <gu4fgi$1222$1@adenine.netfront.net>

Carl Banks wrote:
> On May 8, 7:19 pm, namekuseijin <namekusei... at gmail.com> wrote:
>> On May 8, 10:13 pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>> In Haskell, Lisp and other functional programming languages, any extra
>> syntax gets converted into the core lambda constructs.
> 
> So?  The user still uses that syntax, so how can you claim it doesn't
> matter?
>>  In Lisp
>> languages, that syntax is merely user-defined macros, but in Haskell
>> it's builtin the compiler for convenience.
> 
> I don't even know what you're saying here

I'm saying syntax is nothing special.  They are user-defined, as 
functions.  And it all gets converted into functions.  Functions matter, 
syntax is irrelevant because you can do away with it.

In Haskell, point free style of programming shows almost no signs of 
predefined syntax at all.  It's all function composition.

In functional programming languages, predefined syntax is mostly 
irrelevant.  In Python and other imperative languages, it's absolutely 
necessary.  That's my point.


From metolone+gmane at gmail.com  Sat May  9 14:06:56 2009
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Sat, 9 May 2009 11:06:56 -0700
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com><mailman.5310.1241809502.11746.python-list@python.org><m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
Message-ID: <gu4gnv$tua$1@ger.gmane.org>

<anuraguniyal at yahoo.com> wrote in message 
news:994147fb-cdf3-4c55-8dc5-62d769b12cdc at u9g2000pre.googlegroups.com...
> Sorry being unclear again, hmm I am becoming an expert in it.
>
> I pasted that code as continuation of my old code at start
> i.e
>  class A(object):
>      def __unicode__(self):
>          return u"?au"
>
>      def __repr__(self):
>          return unicode(self).encode("utf-8")
>      __str__ = __repr__
>
> doesn't work means throws unicode error
> my question boils down to
> what is diff between, why one doesn't throws error and another does
> print unicode(a)
> vs
> print unicode([a])

That is still an incomplete example.  Your results depend on your source 
code's encoding and your system's stdout encoding.  Assuming a=A(), 
unicode(a) returns u'?au', but then is converted to stdout's encoding for 
display.  An encoding such as cp437 (U.S. Windows console) will fail.  the 
repr of [a] is a byte string in the encoding of your source file.  The 
unicode() function, given a byte string of unspecified encoding, uses the 
ASCII codec.  Assuming your source encoding was utf-8, unicode([a],'utf-8') 
will correctly convert it to unicode, and then printing that unicode string 
will attempt to convert it to stdout encoding.  On a utf-8 console, it will 
work, on a cp437 console it will not.

Here's a new one:

In PythonWin (from pywin32-313), stdout is utf-8, so:

>>> print '?'  # this is a utf8 byte string
?
>>> '?'  # view the utf8 bytes
'\xc2\xa9'
>>> u'?'  # view the unicode character
u'\xa9'
>>> print '\xc2\xa9'  # stdout is utf8, so it is understood
?
>>> print u'\xa9'  # auto-converts to utf8.
?
>>> print unicode('\xc2\xa9')  # encoding not given, defaults to ASCII.
Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 0: 
ordinal not in range(128)
>>> print unicode('\xc2\xa9','utf8')  # provide the encoding
?

This gives different results when the stdout encoding is different.  Here's 
a couple of the same instructions on my Windows console with cp437 encoding, 
which doesn't support the copyright character:

>>> print '\xc2\xa9' # stdout is cp437
??
>>> print u'\xa9'  # tries to convert to cp437
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\dev\python\lib\encodings\cp437.py", line 12, in encode
    return codecs.charmap_encode(input,errors,encoding_map)
UnicodeEncodeError: 'charmap' codec can't encode character u'\xa9' in 
position 0: character maps to <undefined>

Hope that helps your understanding,
Mark





From steve at REMOVE-THIS-cybersource.com.au  Sat May  9 14:21:07 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 18:21:07 GMT
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
	<gu4fgi$1222$1@adenine.netfront.net>
Message-ID: <0215bccb$0$20647$c3e8da3@news.astraweb.com>

On Sat, 09 May 2009 14:57:24 -0300, namekuseijin wrote:

> I'm saying syntax is nothing special.  They are user-defined, as
> functions.  And it all gets converted into functions.  Functions matter,
> syntax is irrelevant because you can do away with it.

How do you call functions without syntax? By mental telepathy? By direct 
manipulation of the electromagnetic fields inside the CPU?


> In Haskell, point free style of programming shows almost no signs of
> predefined syntax at all.  It's all function composition.

But it takes syntax in order to write function composition. There's at 
least six ways of doing function composition:

f(g(x))    # used in many programming languages and mathematics
f . g (x)  # Haskell
f o g (x)  # mathematics
g f        # stack-based languages like Forth
g x | f    # Unix-like shells
compose(f, g)(x)   # possible in many languages.

> In functional programming languages, predefined syntax is mostly
> irrelevant.  In Python and other imperative languages, it's absolutely
> necessary.  That's my point.

I think your point is wrong. Without syntax, there can be no written 
communication. In Haskell, f.g is not the same as f+g -- the difference 
is one of syntax.


-- 
Steven


From address_is at invalid.invalid  Sat May  9 14:23:25 2009
From: address_is at invalid.invalid (uuid)
Date: 09 May 2009 18:23:25 GMT
Subject: Get multiprocessing.Queue to do priorities
References: <28KdnTocUpw2X5jXnZ2dnUVZ_sudnZ2d@pdx.net>
Message-ID: <529683651263584828.031438address_is-invalid.invalid@news.arcor.de>

Scott David Daniels <Scott.Daniels at Acm.Org> wrote:
> 
> ? "one producer, many consumers" ?
> What would the priority queue do?  Choose a consumer?

Sorry, I should have provided a little more detail. There is one
producer thread, reading urls from multiple files and external input.
These urls have a certain priority, and are fed to multiple consumer
threads for fetching and further processing (XML parsing and such CPU
intensive stuff). Since the content of the urls is changing over time,
it is crucial to have a certain amount of control over the order in
which the requests occur. So, to answer the question: 
The priority queue would make sure that out of a number of
asynchronously added items, those with a high priority are fetched first
by the worker threads. Sounds like a perfect case for a heap, if only I
could :)


From gdamjan at gmail.com  Sat May  9 14:40:06 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Sat, 09 May 2009 20:40:06 +0200
Subject: [Python-Dev] .pth files are evil
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<mailman.5337.1241880127.11746.python-list@python.org>
Message-ID: <69vgd6-hde.ln1@archaeopteryx.softver.org.mk>

> Ah, ok. Is there also an easy_install invocation that unpacks the zip
> file into some location of sys.path (which then wouldn't require
> editing sys.path)?

You have pip that does that :)


-- 
?????? ( http://softver.org.mk/damjan/ )

... knowledge is exactly like power - something 
to be distributed as widely as humanly possible,
for the betterment of all. -- jd



From google at smetj.net  Sat May  9 15:02:14 2009
From: google at smetj.net (google at smetj.net)
Date: Sat, 9 May 2009 12:02:14 -0700 (PDT)
Subject: SimpleXMLRPCServer and creating a new object on for each new 
	client request.
References: <mailman.5173.1241647285.11746.python-list@python.org> 
	<m2ab5ojyff.fsf@cs.uu.nl>
Message-ID: <09a3e655-06ad-46cb-9955-303948f2b271@e24g2000vbe.googlegroups.com>

On May 8, 1:17?am, Piet van Oostrum <p... at cs.uu.nl> wrote:
> >>>>> Jelle Smet <je... at smetj.net> (JS) wrote:
>
> One more thing:
>
> >JS> I start python interactively:
> >>>>> import xmlrpclib
> >>>>> session1=xmlrpclib.ServerProxy('http://localhost:8000')
> >>>>> session2=xmlrpclib.ServerProxy('http://localhost:8000')
> >>>>> print session1.show_random()
> >JS> 13930
> >>>>> print session2.show_random()
> >JS> 13930
>
> I get the impression, also from your use of the variable names
> 'session1' and 'session2' that xmlrpclib.ServerProxy() gives you some
> kind of connection to the XMLRPC server. This is not the case. It gives
> just an administration object *in the client* that will communicate with
> the server when you call a method on it. The two session's in your code
> are therefore functionally equivalent and there is no advantage in
> having two of them instead of one. And the name session is misleading.
>
> Please note also that XMLRPC isn't object-oriented. There is just the
> server; in the protocol there are no objects other than the server.
> --
> Piet van Oostrum <p... at cs.uu.nl>
> URL:http://pietvanoostrum.com[PGP 8DAE142BE17999C4]
> Private email: p... at vanoostrum.org

Hi Piet,
Yes, I'm aware of this.

>You create a single instance of your class and then register that. There
>is nothing in your code that makes the server believe it should create a
>new instance for each request.
>On the other hand, If SimpleXMLRPCServer had this capability, my example wouldn't be correct anyway, because only one instance of class Randomizer is >created when the SimpleXMLRPCServer starts.

Exactly, I understand.

>Otherwise you would have to register a function that creates a new
>instance on every call.
>But as Martin P. Hellwig has noted, it wouldn't give you sessions anyway.

Well, I think Martin's example will suit my needs.

Thanks for the explanation!

Jelle

Thanks for the feedback, ...



From http  Sat May  9 15:08:49 2009
From: http (Paul Rubin)
Date: 09 May 2009 12:08:49 -0700
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
	<gu4fgi$1222$1@adenine.netfront.net>
	<0215bccb$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <7xfxfet7pa.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> I think your point is wrong. Without syntax, there can be no written 
> communication. In Haskell, f.g is not the same as f+g -- the difference 
> is one of syntax.

In Haskell, (+) and (.) are both functions.  (+) takes two numbers as
arguments and returns their sum.  (.) takes two functions as arguments
and returns a new function which composes f and g.  2 + 3 is the same
as (+) 2 3.  f . g is the same as (.) f g.  The infix notations
are considered syntax sugar.  The parentheses around (+) and (.)
are so the compiler doesn't get lexically confused, but you could say

   add = (+)
   compose = (.)
   a = add 2 3
   b = compose square cube
   c = b 2

now "print a" will print 5, and "print c" would print 64 (which is 2**6).
(There aren't actually builtins square and cube, but pretend there are).

So it's really true you can get rid of almost all Haskell expression
syntax.  There's actually a preprocessor called Liskell that lets you
write Haskell as Lisp-like S-expressions, which is handy if you want
to use a macro processor on it.


From piet at cs.uu.nl  Sat May  9 15:31:26 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 09 May 2009 21:31:26 +0200
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
Message-ID: <m263gagjjl.fsf@cs.uu.nl>

>>>>> "Mark Tolonen" <metolone+gmane at gmail.com> (MT) wrote:

>MT> <anuraguniyal at yahoo.com> wrote in message
>MT> news:994147fb-cdf3-4c55-8dc5-62d769b12cdc at u9g2000pre.googlegroups.com...
>>> Sorry being unclear again, hmm I am becoming an expert in it.
>>> 
>>> I pasted that code as continuation of my old code at start
>>> i.e
>>> class A(object):
>>> def __unicode__(self):
>>> return u"?au"
>>> 
>>> def __repr__(self):
>>> return unicode(self).encode("utf-8")
>>> __str__ = __repr__
>>> 
>>> doesn't work means throws unicode error
>>> my question boils down to
>>> what is diff between, why one doesn't throws error and another does
>>> print unicode(a)
>>> vs
>>> print unicode([a])

>MT> That is still an incomplete example.  Your results depend on your source
>MT> code's encoding and your system's stdout encoding.  Assuming a=A(),
>MT> unicode(a) returns u'?au', but then is converted to stdout's encoding for
>MT> display.  

You are confusing the issue. It does not depend on the source code's
encoding (supposing that the encoding declaration in the source is
correct). repr returns unicode(self).encode("utf-8"), so it is utf-8
encoded even when the source code had a different encoding. The u"?au"
string is not dependent on the source encoding.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From piet at cs.uu.nl  Sat May  9 15:43:57 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 09 May 2009 21:43:57 +0200
Subject: Thread locking question.
References: <30763887-0b49-47c7-b4c2-76892024b36a@d38g2000prn.googlegroups.com>
	<m2ws8qgufe.fsf@cs.uu.nl>
	<d0d48afe-0f38-4dd5-b3dd-2827b57844e4@i28g2000prd.googlegroups.com>
Message-ID: <m21vqygiyq.fsf@cs.uu.nl>

>>>>> grocery_stocker <cdalten at gmail.com> (gs) wrote:

[snip]

>gs> Maybe I'm being a bit daft, but what prevents the data from www.yahoo.com
>gs> from being mixed up with the data from www.google.com? Doesn't using
>gs> queue() prevent the data from being mixed up?

Nothing in your script prevents the data from getting mixed up. Now it
seems from some experimentation that the print statements might be atomic,
although I can't find anything about that in the Python doc, and I think
you shouldn't count on that. I would expect it not to be atomic when it
does a blocking I/O.

If I make your example more complete, printing the documents completely,
like:

    def run(self):
        while True:
            host = self.queue.get()
            if host is None:
                break
            url = urllib2.urlopen(host)
            while True:
                txt = url.read(1024)
                if not txt: break
                print txt,

then the document will get mixed up in the output. Likewise if you would
want to put them in a shared datastructure, you must use locking when you
insert them (for example you could put them in another Queue).

The Queue you use here only prevent the urls from getting mixed up, but
it has no effect on the further processing.

As I told my students two days ago: you shouldn't do thread programming
unless you have thoroughly studied the subject.

By the way there is another flaw in your program: you do the join only
on the last spawned thread. Because the threads are daemonic all other
threads that are still working will be killed prematurely when this
thread finishes.

The code should be like this:

def main():
    threads = []
    for i in range(5):
        t = MyUrl(queue)
        t.setDaemon(True)
        t.start()
        threads.append(t)
...
    for t in threads:
        t.join()

Or just don't make them daemonic.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From Scott.Daniels at Acm.Org  Sat May  9 16:00:36 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 13:00:36 -0700
Subject: Get multiprocessing.Queue to do priorities
In-Reply-To: <529683651263584828.031438address_is-invalid.invalid@news.arcor.de>
References: <28KdnTocUpw2X5jXnZ2dnUVZ_sudnZ2d@pdx.net>
	<529683651263584828.031438address_is-invalid.invalid@news.arcor.de>
Message-ID: <-vKdnex07oQzQpjXnZ2dnUVZ_hZi4p2d@pdx.net>

uuid wrote:
> Scott David Daniels <Scott.Daniels at Acm.Org> wrote:
>> ? "one producer, many consumers" ?
>> What would the priority queue do?  Choose a consumer?
> 
> Sorry, I should have provided a little more detail. There is one
> producer thread, reading urls from multiple files and external input.
> These urls have a certain priority, and are fed to multiple consumer
> threads for fetching and further processing (XML parsing and such CPU
> intensive stuff). Since the content of the urls is changing over time,
> it is crucial to have a certain amount of control over the order in
> which the requests occur. So, to answer the question: 
> The priority queue would make sure that out of a number of
> asynchronously added items, those with a high priority are fetched first
> by the worker threads. Sounds like a perfect case for a heap, if only I
> could :)

2.6 has a PriorityQueue in the Queue module.
If you aren't using 2.6, you could copy the code for your own version.

--Scott David Daniels
Scott.Daniels at Acm.Org


From robert.kern at gmail.com  Sat May  9 16:15:40 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 09 May 2009 15:15:40 -0500
Subject: IIR filter conversion routines for Python?
In-Reply-To: <28232dc7-d7d2-4cec-a48e-a0144efa1a5b@v17g2000vbb.googlegroups.com>
References: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>	<mailman.5267.1241760908.11746.python-list@python.org>
	<28232dc7-d7d2-4cec-a48e-a0144efa1a5b@v17g2000vbb.googlegroups.com>
Message-ID: <gu4o9c$fq8$1@ger.gmane.org>

On 2009-05-09 06:54, wzab wrote:

> Unfortunately the Matlab scripts that are floating around the net  do
> not contain the license information.
> (e.g. takasila.coe.psu.ac.th/~s4810685/DSP/proakis/PWS_DSP/dir2cas.m )
> So I don't know if it sufficient to consider the "public domain"...

No! The opposite in fact. No license information simply means you do not have a 
license. It is copyrighted at the moment of creation.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Sat May  9 16:27:02 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 09 May 2009 15:27:02 -0500
Subject: IIR filter conversion routines for Python?
In-Reply-To: <2a7b69f5-9059-4eb0-a1ad-c6c58c98b4dd@t11g2000vbc.googlegroups.com>
References: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>	<mailman.5267.1241760908.11746.python-list@python.org>	<28232dc7-d7d2-4cec-a48e-a0144efa1a5b@v17g2000vbb.googlegroups.com>
	<2a7b69f5-9059-4eb0-a1ad-c6c58c98b4dd@t11g2000vbc.googlegroups.com>
Message-ID: <gu4oum$i2a$1@ger.gmane.org>

On 2009-05-09 08:34, wzab wrote:
>> In fact I have almost finished the simple dir2cas.py converter.
>> I'll post the source as soon, as it is ready.
>
> OK. So here it is as public domain code. Any hints and suggestions
> of improvements are appreciated.
>
> http://groups.google.com/group/alt.sources/browse_thread/thread/924fbe2255f8c42d

Wow! A shar archive posted to alt.sources. I haven't seen one of those used in 
anger in a *long* time.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From arnodel at googlemail.com  Sat May  9 16:47:42 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 09 May 2009 21:47:42 +0100
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
Message-ID: <m2bpq2ngup.fsf@googlemail.com>

Tobias Weber <towb at gmx.net> writes:

> In article <K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d at pdx.net>,
>  Scott David Daniels <Scott.Daniels at Acm.Org> wrote:
>
>> At least vim and emacs can do so.
>
> Just tried Aquamacs. Using the defaults it correctly re-wraped 
> docstrings using newlines when inserting, but not when removing words.
> So even with the prime editor hard wrap seems, for writing, inferior to 
> soft wrap.

A simple Alt-Q will reformat everything nicely.

-- 
Arnaud (posting using gnus on Aquamacs)


From piet at cs.uu.nl  Sat May  9 16:47:47 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 09 May 2009 22:47:47 +0200
Subject: SimpleXMLRPCServer and creating a new object on for each new
	client request.
References: <mailman.5173.1241647285.11746.python-list@python.org>
	<m2ab5ojyff.fsf@cs.uu.nl>
	<09a3e655-06ad-46cb-9955-303948f2b271@e24g2000vbe.googlegroups.com>
Message-ID: <m2ws8qf1fw.fsf@cs.uu.nl>

>>>>> google at smetj.net (g) wrote:

>g> Well, I think Martin's example will suit my needs.

>g> Thanks for the explanation!

His client code is unnecessarily complicated with 3 session variables.
The following code does the same:

    SESSION = xmlrpclib.ServerProxy(URL_PORT)
    print(SESSION.show_random())
    print(SESSION.show_random())
    SESSION.shutdown_service()

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From metolone+gmane at gmail.com  Sat May  9 17:21:43 2009
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Sat, 9 May 2009 14:21:43 -0700
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com><mailman.5310.1241809502.11746.python-list@python.org><m2eiuzi92l.fsf@cs.uu.nl><977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com><mailman.5338.1241882849.11746.python-list@python.org><994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com><mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
Message-ID: <gu4s55$q7d$1@ger.gmane.org>


"Piet van Oostrum" <piet at cs.uu.nl> wrote in message 
news:m263gagjjl.fsf at cs.uu.nl...
>>>>> "Mark Tolonen" <metolone+gmane at gmail.com> (MT) wrote:

>>MT> <anuraguniyal at yahoo.com> wrote in message
>>MT> 
>>news:994147fb-cdf3-4c55-8dc5-62d769b12cdc at u9g2000pre.googlegroups.com...
>>>> Sorry being unclear again, hmm I am becoming an expert in it.
>>>>
>>>> I pasted that code as continuation of my old code at start
>>>> i.e
>>>> class A(object):
>>>> def __unicode__(self):
>>>> return u"?au"
>>>>
>>>> def __repr__(self):
>>>> return unicode(self).encode("utf-8")
>>>> __str__ = __repr__
>>>>
>>>> doesn't work means throws unicode error
>>>> my question boils down to
>>>> what is diff between, why one doesn't throws error and another does
>>>> print unicode(a)
>>>> vs
>>>> print unicode([a])

>>MT> That is still an incomplete example.  Your results depend on your 
>>source
>>MT> code's encoding and your system's stdout encoding.  Assuming a=A(),
>>MT> unicode(a) returns u'?au', but then is converted to stdout's encoding 
>>for
>>MT> display.

>You are confusing the issue. It does not depend on the source code's
>encoding (supposing that the encoding declaration in the source is
>correct). repr returns unicode(self).encode("utf-8"), so it is utf-8
>encoded even when the source code had a different encoding. The u"?au"
>string is not dependent on the source encoding.

Sorry about that.  I'd forgotten that the OP'd forced __repr__ to utf-8. 
You bring up a good point, though, that the encoding the file is actually 
saved in and the encoding declaration in the source have to match.  Many 
people get that wrong as well.

-Mark




From UrsusMaximus at gmail.com  Sat May  9 17:28:21 2009
From: UrsusMaximus at gmail.com (UrsusMaximus at gmail.com)
Date: Sat, 9 May 2009 14:28:21 -0700 (PDT)
Subject: "Beginning Python Visualization" by Shai Vaingast
Message-ID: <c38538d6-c9bf-425d-b23f-7b848192c677@y34g2000prb.googlegroups.com>

I just read this book and liked it. Here is a review:

Sometimes a picture is worth a thousand words. "Beginning Python
Visualization: Creating Visual Transformation Scripts", published in
February 2009 by Apress, shows how Python and its related tools can be
used to easily and effectively turn raw data into visual
representations that communicate effectively. The author is Shai
Vaingast, a professional engineer and engineering manager who needed
to train scientists and engineers to do this kind of programming work.
He was looking for a tutorial and reference work, and unable to find a
suitable text, wound up writing his first book. He wrote in the easy
and clear style of someone comfortable and engaged with the subject
matter.

The book uses several very specific examples that illustrate general
principles.

The first example is using GPS data. By using Python one can extract
data from GPS receivers and enter it into the computer and manipulate
it to do what one wants including creating graphs and charts. In this
section he shows how to use CSV, comma separated values, as a most
useful file format. He shows show to extract data from real world GPS
devices and import it via serial ports and the PySerial module. It
would be easy for the reader to duplicate and extend this project.

The heart of the book is coverage of useful examples utilizing
MatPlotLib, NumPy and SciPy. These related tools are easy to use and
fully integrated with Python. MatPlotLib is for plotting data and
graphs, including interactive graphs and image files. NumPy is a
powerful math library comparable to commercial tools like MatLab, and
SciPy extends NumPy to for the sciences. Examples are numerous and
include signal analysis using Fourier transforms.

There is also a section on Image Processing using PIL, the Python
Imaging Library. This is used for relatively simple image cropping and
sizing and also for bit by bit image processing. Interpolation and
curve fitting are also well covered. For anyone wanting an
introduction to graphical analysis of statistical data, this would be
an excellent resource.

The author is obviously a professional in this field. He has a knack
for good organizational style and a pragmatic approach to the work. In
the book he says "Most of the time, research is organized chaos. The
emphasis, however, should be on organized, not chaos." A real value I
got from the book is a better understanding of data files, format, and
organization as well as methods and guidelines for selecting file
formats and storing and organizing data to enable fast and efficient
data processing. It is obvious that this book was written by a
practicing engineer.

The theme of the book is that Python can be an all purpose environment
for data manipulation and visualization, using nothing but free and
open source tools that are easily integrated and scriptable without
using multiple programming languages. The book should be an invaluable
tool for scientists and engineers but it is also easily accessible to
anyone interested in math and data analysis. There is no need for an
advanced math background. While, as a matter of full disclosure, I
have undergraduate degrees in Math and Physics, I feel the book should
be easily accessible to anyone with a solid high school math
background who is seriously interested in the subject. The book
contains a short introductory tutorial on the basics of Python so
anyone familiar with programming in any language should be fine.

The book is an easy read from front to back, and I am sure it will
also be a good reference resource for the future. The writing style is
very clear and unforced and I found surprisingly few errors. While the
Python world has a surplus of introductory and general books, books
covering this kind of specific domain are especially welcome, and we
could use more on other topics by competent authors.

At 363 pages the book is a surprisingly fast read. Its methodology is
to use specific, short code examples to make all the key points. Most
of the code samples are well selected, short and written in clear,
concise Python. This is not the kind of book that overwhelms you with
massive amounts of code. Either the book was well edited or else it
was written by an exceptionally lucid thinker, or both.

So, if you want to learn how to process, organize, and visualize data
from various sources using the Python language, I recommend this book
to you.

I also posted a podcast of an interview with the author, Shai
Vaingast, at <a href="http://www.awaretek.com/python/
index.html">Python411</a>



From castironpi at gmail.com  Sat May  9 17:33:06 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Sat, 9 May 2009 14:33:06 -0700 (PDT)
Subject: Why there is a parameter named "self" for classmethod function?
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com> 
	<4A024F18.9080407@kbsymanzik.org>
	<mailman.5206.1241671190.11746.python-list@python.org> 
	<pan.2009.05.07.06.29.56@REMOVE.THIS.cybersource.com.au>
	<2c80e8d0-cc44-48b3-8b90-7b165eb20ed4@g20g2000vba.googlegroups.com>
	<0214c701$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <25e645ad-e471-4f81-9cfa-c979dd1e9f2b@b1g2000vbc.googlegroups.com>

On May 8, 7:52?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Thu, 07 May 2009 04:27:15 -0700, Aaron Brady wrote:
> >> Can be, but if there's reason enough to keep it with a class, there's
> >> no reason not to.
>
> > That's a bit of hyperbole; the usual reasons such as code bloat,
> > namespace bloat, maintainability etc. all weigh against it. ?It's just
> > that the benefits weigh heavier.
>
> I'm not sure I understand. Whether the function is in the class or
> extracted out into the module, it is exactly the same function. (Apart
> from an extra level of indentation, and either an unused "self" parameter
> or a @staticmethod line.) Same amount of code, same difficulty of
> maintainability. Namespace bloat is also the same, the only difference
> being which namespace is bloated: the class or the method.
>
> --
> Steven

My post was a little harsh.  I meant to say that I think I got your
idea, but the form it came in was a tautology.  Its form was X if not
not X.  Tautologies come across as particularly low bandwidth in
writing, though they do have some content in context.  I observe
people say them a lot too: 'it is what it is', 'if I want to I want
to', 'two bucks is two bucks', etc.  Some of the context comes from
the partial conventional asymmetry of sentences in English between
subject and predicate (nominative and accusative), though there is
none in logic.  Not to mention, 'hyperbole' isn't the word for what I
was thinking either... ahem.

The best place for such a function between those two choices can
depend on many things, some of which are matters of taste.  If the
definition occurs in the class, it may be more convenient to read or
edit.  That difference is pretty negligible.  There is semantic
difference to inherited classes: whether you have to import the class
or the class /and/ the function.  Then when it is called, the form
will be either 'class.methodA' or just 'methodA', which makes a
difference in readability (obviousness) elsewhere that it is called.

> being which namespace is bloated: the class or the method.

I think you meant 'class or module'.


From dina.ali08 at googlemail.com  Sat May  9 17:56:17 2009
From: dina.ali08 at googlemail.com (Dina Ali)
Date: Sat, 9 May 2009 22:56:17 +0100
Subject: pyMPI error on mpi.barrier
Message-ID: <4a031c930905091456gd21694ex5cb93ca15cae21f8@mail.gmail.com>

Hello there

I am trying to paralleize GA code using pyMPI. part of the code and and the
error message is as below.
i write the new positions in a file by root (which is mpi.rank = 0) then
other processes are suppose to wait
until the written in the file finishes to start evaluating the objective.
the problem arises in the barrier method...
any ideas on how to do this would be very much appreciated..

for i in xrange(max_iter):
            if (mpi.rank == 0):
                update_positions()
                save_GA_pops_iter()

            mpi.barrier()  <---------------------------- error is here
            evaluate_objective()
            mpi.barrier()

error message:
    mpi.barrier()
mpi.MPIError: MPI_Error_string: invalid communicator: Input/output error
(pyMPI_comm_io.c:367)


Thanks very much
Dina
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From dina.ali08 at googlemail.com  Sat May  9 17:56:55 2009
From: dina.ali08 at googlemail.com (Dina Ali)
Date: Sat, 9 May 2009 22:56:55 +0100
Subject: pyMPI error on mpi.barrier
In-Reply-To: <4a031c930905091456gd21694ex5cb93ca15cae21f8@mail.gmail.com>
References: <4a031c930905091456gd21694ex5cb93ca15cae21f8@mail.gmail.com>
Message-ID: <4a031c930905091456r7ac4e827o5cff61b959f092c8@mail.gmail.com>

Hello there

I am trying to paralleize GA code using pyMPI. part of the code and and the
error message is as below.
i write the new positions in a file by root (which is mpi.rank = 0) then
other processes are suppose to wait
until the written in the file finishes to start evaluating the objective.
the problem arises in the barrier method...
any ideas on how to do this would be very much appreciated..

for i in xrange(max_iter):
            if (mpi.rank == 0):
                update_positions()
                save_GA_pops_iter()

            mpi.barrier()  <---------------------------- error is here
            evaluate_objective()
            mpi.barrier()

error message:
    mpi.barrier()
mpi.MPIError: MPI_Error_string: invalid communicator: Input/output error
(pyMPI_comm_io.c:367)


Thanks very much
Dina
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From dina.ali08 at googlemail.com  Sat May  9 17:57:13 2009
From: dina.ali08 at googlemail.com (Dina Ali)
Date: Sat, 9 May 2009 22:57:13 +0100
Subject: pyMPI error on mpi.barrier
In-Reply-To: <4a031c930905091456r7ac4e827o5cff61b959f092c8@mail.gmail.com>
References: <4a031c930905091456gd21694ex5cb93ca15cae21f8@mail.gmail.com>
	<4a031c930905091456r7ac4e827o5cff61b959f092c8@mail.gmail.com>
Message-ID: <4a031c930905091457s614e0f9bkb2dc7a6426aa71b0@mail.gmail.com>

Hello there

I am trying to paralleize GA code using pyMPI. part of the code and and the
error message is as below.
i write the new positions in a file by root (which is mpi.rank = 0) then
other processes are suppose to wait
until the written in the file finishes to start evaluating the objective.
the problem arises in the barrier method...
any ideas on how to do this would be very much appreciated..

for i in xrange(max_iter):
            if (mpi.rank == 0):
                update_positions()
                save_GA_pops_iter()

            mpi.barrier()  <---------------------------- error is here
            evaluate_objective()
            mpi.barrier()

error message:
    mpi.barrier()
mpi.MPIError: MPI_Error_string: invalid communicator: Input/output error
(pyMPI_comm_io.c:367)


Thanks very much
Dina
-------------- next part --------------
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From M8R-gqmgb4 at mailinator.com  Sat May  9 18:11:21 2009
From: M8R-gqmgb4 at mailinator.com (uuid)
Date: Sun, 10 May 2009 00:11:21 +0200
Subject: Get multiprocessing.Queue to do priorities
References: <4a05b27a_2@news.arcor-ip.de> <4a05b6c6_2@news.arcor-ip.de>
	<28KdnTocUpw2X5jXnZ2dnUVZ_sudnZ2d@pdx.net>
	<529683651263584828.031438address_is-invalid.invalid@news.arcor.de>
	<-vKdnex07oQzQpjXnZ2dnUVZ_hZi4p2d@pdx.net>
Message-ID: <4a05ff89_1@news.arcor-ip.de>

The Queue module, apparently, is thread safe, but *not* process safe. 
If you try to use an ordinary Queue, it appears inaccessible to the 
worker process. (Which, after all, is quite logical, since methods for 
moving items between the threads of the same process are quite 
different from inter-process communication.) It appears that creating a 
manager that holds a shared queue might be an option 
(http://stackoverflow.com/questions/342556/python-2-6-multiprocessing-queue-compatible-with-threads).

Just 

for illustration: This shows that Queue.Queue doesn't work with processes:

------------------------
def worker(queue):
    while True:
        item = queue.get()
        print item
        queue.task_done()

queue_queue = Queue.Queue()

worker_thread = multiprocessing.Process(target=worker, args=(queue_queue,))
worker_thread.start()
for i in range(10):
    queue_queue.put(str(i))
time.sleep(10)
while True:
    try:
        print 'still on queue: ' + queue_queue.get(False)
    except Queue.Empty:
        break
worker_thread.join()
------------------------

This yields:

still on queue: 0
still on queue: 1
still on queue: 2
still on queue: 3
still on queue: 4
still on queue: 5
still on queue: 6
still on queue: 7
still on queue: 8
still on queue: 9

So no queue item ever arrives at the worker process.



On 2009-05-09 22:00:36 +0200, Scott David Daniels <Scott.Daniels at Acm.Org> said:

> 2.6 has a PriorityQueue in the Queue module.
> If you aren't using 2.6, you could copy the code for your own version.




From ben+python at benfinney.id.au  Sat May  9 19:24:11 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 10 May 2009 09:24:11 +1000
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<87zldmcod8.fsf@benfinney.id.au>
	<towb-E9C0DC.18061409052009@news.individual.de>
Message-ID: <87vdo9dfms.fsf@benfinney.id.au>

Tobias Weber <towb at gmx.net> writes:

> In article <87zldmcod8.fsf at benfinney.id.au>,
>  Ben Finney <ben+python at benfinney.id.au> wrote:
> 
> > Yes. Both Emacs and Vim will do exactly this when re-wrapping a
> 
> Thought so. And editors without a learning curve?

A text editor that will be useful in all of your computing is something
worth learning. Instead of needing to re-learn an editor every time you
take up a new text editing task, pick a powerful, customisable editor
and learn it *once*. Either of Emacs or Vim are good choices.

-- 
 \     ?The trouble with the world is that the stupid are cocksure and |
  `\             the intelligent are full of doubt.? ?Bertrand Russell |
_o__)                                                                  |
Ben Finney


From ldo at geek-central.gen.new_zealand  Sat May  9 20:09:13 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 10 May 2009 12:09:13 +1200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
Message-ID: <gu55va$uba$2@lust.ihug.co.nz>

In message <towb-EA7906.14423909052009 at news.individual.de>, Tobias Weber 
wrote:

> the guideline (PEP 8) is hard wrap to 7x characters.

Nowadays I set my maximum line lengths, and the widths of my terminal 
windows to 100 characters. And I'm wondering whether or not to go wider 
still. After all, the screens can take it.



From aahz at pythoncraft.com  Sat May  9 20:09:48 2009
From: aahz at pythoncraft.com (Aahz)
Date: 9 May 2009 17:09:48 -0700
Subject: About twisted.mail.smtp.SMTPDeliveryError
References: <8bb91b91-c00d-48d1-8b64-6f4765754e1c@d19g2000prh.googlegroups.com>
Message-ID: <gu560c$1r6$1@panix3.panix.com>

In article <8bb91b91-c00d-48d1-8b64-6f4765754e1c at d19g2000prh.googlegroups.com>,
gganesh  <ganesh.gbg at gmail.com> wrote:
>
>MAILSERVER = 'mail.xxx.com'
>done = sendmail(MAILSERVER, FROM, listTo,
>MSGBODY ,senderDomainName=None, port=25)
>
>"Failure: twisted.mail.smtp.SMTPDeliveryError: 554 No recipients
>accepted"
>and
>"Relay access denied" errors
>
>Is this error is because, i haven't authenticated my email account to
>send mail.  Is so , having username and password of smpt server ,how to
>authenticate in Twisted Framework

Are you doing this from your local machine?  If yes, you probably need to
use your ISP's SMTP server; blocking non-local access is one technique
for keeping zombied machines from spewing malware.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From Scott.Daniels at Acm.Org  Sat May  9 20:20:40 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 17:20:40 -0700
Subject: Wrapping comments
In-Reply-To: <gu55va$uba$2@lust.ihug.co.nz>
References: <towb-EA7906.14423909052009@news.individual.de>
	<gu55va$uba$2@lust.ihug.co.nz>
Message-ID: <vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d@pdx.net>

Lawrence D'Oliveiro wrote:
> In message <towb-EA7906.14423909052009 at news.individual.de>, Tobias Weber 
> wrote:
> 
>> the guideline (PEP 8) is hard wrap to 7x characters.
> 
> Nowadays I set my maximum line lengths, and the widths of my terminal 
> windows to 100 characters. And I'm wondering whether or not to go wider 
> still. After all, the screens can take it.
> 
But the printers cannot.  And I wind up quietly cursing code writers
who figure the only window I look at is the one they put the code in.
In other words, I have a large enough screen to look at two pages
side-by-side, and somebody decides he wants to use 2/3 of that width.
Think of your reader, not just your operational environment, unless
you are programming on your own and don't care to share.

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at REMOVE-THIS-cybersource.com.au  Sat May  9 20:36:27 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 10 May 2009 00:36:27 GMT
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
	<gu4fgi$1222$1@adenine.netfront.net>
	<0215bccb$0$20647$c3e8da3@news.astraweb.com>
	<7xfxfet7pa.fsf@ruckus.brouhaha.com>
Message-ID: <021614c1$0$20647$c3e8da3@news.astraweb.com>

On Sat, 09 May 2009 12:08:49 -0700, Paul Rubin wrote:

> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
>> I think your point is wrong. Without syntax, there can be no written
>> communication. In Haskell, f.g is not the same as f+g -- the difference
>> is one of syntax.
> 
> In Haskell, (+) and (.) are both functions.

"Left-parens op right-parens" is syntax.

> So it's really true you can get rid of almost all Haskell expression
> syntax.

And what you've got left is syntax. Without syntax, how can you tell the 
difference between a meaningful character string and a jumble of random 
gibberish? Without syntax, how can you tell where one token finishes and 
the next begins?


-- 
Steven


From pavlovevidence at gmail.com  Sat May  9 21:23:13 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 9 May 2009 18:23:13 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com> 
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com> 
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com> 
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com> 
	<gu4fgi$1222$1@adenine.netfront.net>
Message-ID: <24381226-a7a0-4fbb-b928-644609e5909b@w31g2000prd.googlegroups.com>

On May 9, 10:57?am, namekuseijin <namekuseijin.nos... at gmail.com>
wrote:
> Carl Banks wrote:
> > On May 8, 7:19 pm, namekuseijin <namekusei... at gmail.com> wrote:
> >> On May 8, 10:13 pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> >> In Haskell, Lisp and other functional programming languages, any extra
> >> syntax gets converted into the core lambda constructs.
>
> > So? ?The user still uses that syntax, so how can you claim it doesn't
> > matter?
> >> ?In Lisp
> >> languages, that syntax is merely user-defined macros, but in Haskell
> >> it's builtin the compiler for convenience.
>
> > I don't even know what you're saying here
>
> I'm saying syntax is nothing special. ?They are user-defined, as
> functions. ?And it all gets converted into functions. ?Functions matter,
> syntax is irrelevant because you can do away with it.

Nope, sorry, you're ignoring half the problem here.  Syntax is only
irrelevant if you actually do do away with it.  As long as syntax is
there and people use it, then it matters, regardless of whether it all
reduces to function calls.

For a very benign example, consider the ways that Python and Haskell
write listcomps:

[ x for x in ss ]
[ x | x <- ss ]

One of these might be more readable than the other (I make no
implication which); however, readability has nothing to do with
whether the compiler internally reduces it to a function call or not.
Readibility counts, therefore syntax matters.

Now, maybe readability concerns don't matter to you personally, but it
does matter to the OP, who is trying to advocate functional
programming but is having difficulty because most purely functional
languages have hideous minimalist syntax that turns people off.

If that syntax could be made a little more readable and workable,
maybe people wouldn't turn up their noses at it on first sight.


> In Haskell, point free style of programming shows almost no signs of
> predefined syntax at all. ?It's all function composition.
>
> In functional programming languages, predefined syntax is mostly
> irrelevant. ?In Python and other imperative languages, it's absolutely
> necessary. ?That's my point.

I think you are overstating this by a lot.


Carl Banks


From namekuseijin.nospam at gmail.com  Sat May  9 21:28:05 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Sat, 09 May 2009 22:28:05 -0300
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <0215bccb$0$20647$c3e8da3@news.astraweb.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>	<gu269i$16if$1@adenine.netfront.net>	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>	<gu4fgi$1222$1@adenine.netfront.net>
	<0215bccb$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <gu59ti$2646$1@adenine.netfront.net>

Steven D'Aprano wrote:
> On Sat, 09 May 2009 14:57:24 -0300, namekuseijin wrote:
> 
>> I'm saying syntax is nothing special.  They are user-defined, as
>> functions.  And it all gets converted into functions.  Functions matter,
>> syntax is irrelevant because you can do away with it.
> 
> How do you call functions without syntax? By mental telepathy? By direct 
> manipulation of the electromagnetic fields inside the CPU?

That's all the syntax notation you need in functional programming 
languages:  one to define functions, and another to call them.  Any 
extras are sugar around the basic definition and calling forms.


From ldo at geek-central.gen.new_zealand  Sat May  9 21:41:15 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 10 May 2009 13:41:15 +1200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<gu55va$uba$2@lust.ihug.co.nz>
	<vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d@pdx.net>
Message-ID: <gu5bbr$1ua$1@lust.ihug.co.nz>

In message <vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d at pdx.net>, Scott David Daniels 
wrote:

> Lawrence D'Oliveiro wrote:
>
>> In message <towb-EA7906.14423909052009 at news.individual.de>, Tobias Weber
>> wrote:
>> 
>>> the guideline (PEP 8) is hard wrap to 7x characters.
>> 
>> Nowadays I set my maximum line lengths, and the widths of my terminal
>> windows to 100 characters. And I'm wondering whether or not to go wider
>> still. After all, the screens can take it.
>> 
> But the printers cannot.

If I had to print out all the code and documentation I have to look at, I'd 
need to add another room to my house.



From ldo at geek-central.gen.new_zealand  Sat May  9 21:48:20 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 10 May 2009 13:48:20 +1200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<gu55va$uba$2@lust.ihug.co.nz>
	<vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d@pdx.net>
	<gu5bbr$1ua$1@lust.ihug.co.nz>
Message-ID: <gu5bp4$261$1@lust.ihug.co.nz>

In message <gu5bbr$1ua$1 at lust.ihug.co.nz>, Lawrence D'Oliveiro wrote:

> In message <vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d at pdx.net>, Scott David Daniels
> wrote:
> 
>> Lawrence D'Oliveiro wrote:
>>
>>> In message <towb-EA7906.14423909052009 at news.individual.de>, Tobias Weber
>>> wrote:
>>> 
>>>> the guideline (PEP 8) is hard wrap to 7x characters.
>>> 
>>> Nowadays I set my maximum line lengths, and the widths of my terminal
>>> windows to 100 characters. And I'm wondering whether or not to go wider
>>> still. After all, the screens can take it.
>>> 
>> But the printers cannot.
> 
> If I had to print out all the code and documentation I have to look at,
> I'd need to add another room to my house.

And yes, the printers most certainly can take it. Back in the days when you 
couldn't even choose different fonts, the most common width for printouts 
was 132 columns.



From http  Sat May  9 21:51:20 2009
From: http (Paul Rubin)
Date: 09 May 2009 18:51:20 -0700
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
	<gu4fgi$1222$1@adenine.netfront.net>
	<0215bccb$0$20647$c3e8da3@news.astraweb.com>
	<7xfxfet7pa.fsf@ruckus.brouhaha.com>
	<021614c1$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <7xeiux9147.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> > So it's really true you can get rid of almost all Haskell expression
> > syntax.
> 
> And what you've got left is syntax. Without syntax, how can you tell the 
> difference between a meaningful character string and a jumble of random 
> gibberish? Without syntax, how can you tell where one token finishes and 
> the next begins?

I didn't say you could get rid of absolutely all of the syntax.  Just
most of it.  All that stuff you'd write in Python with loops,
if-statements, listcomps, etc. can be done with prefix function calls
in Haskell.

Haskell's type system, on the other hand, is much more complex than
Python's, and writing out type specifications does require some syntax.

Overall though, Haskell's syntax, either at the sugared or desugared
level, is not very complicated.  The hurdles to learning Haskell
really are because the concepts it contains are really different than
what most programmers are familiar with.  It's not like many languages
that contain familiar concepts wrapped in new syntax.


From gdamjan at gmail.com  Sat May  9 23:04:17 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Sun, 10 May 2009 05:04:17 +0200
Subject: How can I dynamically insert a base class in a given class
Message-ID: <iqshd6-qkf.ln1@archaeopteryx.softver.org.mk>

How can I dynamically insert a base class in a given class? Yeah, I'm 
writing a class decorator that needs to manipulate the class by 
inserting another base class in it.


Something like:

class ReallyBase(object):
   def someimportantmethod(self):
     return 'really really'

@expose(args)
class Unsuspecting(object):
   def stuff(self):
     return "ok"

I've come up with this ... but I'm sure it has some shortcomings 

def expose(args):
    def wrap(cls):
       # do stuff with args and cls
       return type(cls.__name__, cls.__bases__ + (ReallyBase,), 
dict(cls.__dict__))
    return wrap



-- 
?????? ( http://softver.org.mk/damjan/ )

war is peace
freedom is slavery
restrictions are enablement



From mnordhoff at mattnordhoff.com  Sat May  9 23:21:43 2009
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Sun, 10 May 2009 03:21:43 +0000
Subject: confused with subprocess.Popen
In-Reply-To: <f6a09c160905080112x2620169fk9249e9469be607ea@mail.gmail.com>
References: <f6a09c160905080112x2620169fk9249e9469be607ea@mail.gmail.com>
Message-ID: <4A064847.4080509@mattnordhoff.com>

Soumen banerjee wrote:
> Hello,
> for a certain app, i used to use a command:
> os.system("soundwrapper espeak -f line.txt")
> now, if i wanted to kill espeak, i would have to run:
> os.system("killall espeak")
> since the subprocess module allows sending SIGKILL to the process, i
> decided to switch to using it. However i cant pass the spaced out
> arguments to it. For example:
> a=subprocess.Popen("soundwrapper espeak -f line.txt")
> results in a OSError, no such file or directory.
> How do i use the Popen function?
> Regards
> Soumen

Read subprocess's documentation. It takes a list, not a string:

>>> a = subprocess.Popen(["soundwrapper", "espeak", "-f", "line.txt"])
-- 


From grante at visi.com  Sat May  9 23:34:48 2009
From: grante at visi.com (Grant Edwards)
Date: Sat, 09 May 2009 22:34:48 -0500
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<gu55va$uba$2@lust.ihug.co.nz>
	<vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d@pdx.net>
Message-ID: <b4KdnfIPlvrF1pvXnZ2dnUVZ_jVi4p2d@posted.usinternet>

On 2009-05-10, Scott David Daniels <Scott.Daniels at Acm.Org> wrote:

>> Nowadays I set my maximum line lengths, and the widths of my terminal 
>> windows to 100 characters. And I'm wondering whether or not to go wider 
>> still. After all, the screens can take it.
>> 
> But the printers cannot.

Printers?

The people who produce books?

What've they got to do with it?

-- 
Grant



From dmw at coder.cl  Sun May 10 00:09:13 2009
From: dmw at coder.cl (Daniel Molina Wegener)
Date: Sun, 10 May 2009 00:09:13 -0400
Subject: [ANN] pyxser-1.0R --- python xml serialization
Message-ID: <7592896.nUPlyArG6x@coder.cl>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hello,

I'm pleased to announce pyxser-1.0R, a Python-Object to XML
serializer and deserializer. This package it's completly
written in C and licensed under LGPLv3.

The tested Python versions are 2.5.X and 2.7.X.

* home page:
  http://coder.cl/software/pyxser

* hosted at:
  https://sourceforge.net/projects/pyxser/

The current ChangeLog is as follows:

1.0rc1 (2009.04.26):

        Daniel Molina Wegener <dmw at coder.cl>
        * Added both byte string and unicode returning and procesing
        functions. This means that we have serialize(),
        serialize_c14n(), serialize_c14n_strict(), unserialize(),
        validate() and validate_c14n() functions for byte strings
        and u_serialize(), u_serialize_c14n(), u_serialize_c14n_strict(),
        u_unserialize(), u_validate() and u_validate_c14n() for
        unicode strings.
        * Removed memory leaks, now it runs over 1400000 pyxser
        operations without crashing (100000 cicles testing every
        function).
        * Removed bugs concerning reference counting that was
        crashing when trying to access unserialized objects attributes.
        * This is an approach to a production environment release ;)

1.0r (2009.05.09):

        Daniel Molina Wegener <dmw at coder.cl>
        * Set default validation to XML Schema validation, to allow
        pyxser to work with WebServices and similar technologies,
        without restricting the namespace prefix to pyxs.
        * Removed memory leaks concerning XML Schema validation.
        * Succeful tests with more than 1.200.000 pyxser operations.
        * Added pyxser 1.0 XML Schema to allow imports of the pyxser
        model into WebServices WSDL and similar technologies.
        * Addded getxsd(), getxsd_c14n(), u_validate_c14n_dtd(),
        u_validate_dtd(), validate_c14n_dtd(), validate_dtd()
        functions.
        * All *_dtd() related functions allows you to validate
        pyxser documents using the pyxser 1.0 DTD, instead of
        the pyxser 1.0 XML Schema.

Feel free to use and test. You can modify test-utf8-prof.py
to use more than 100.000 cicles without crashing.

Best regards,
- -- 
.O.| Daniel Molina Wegener   | C/C++ Developer
..O| dmw [at] coder [dot] cl | FreeBSD & Linux
OOO| http://coder.cl/        | Standards Basis
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From anuraguniyal at yahoo.com  Sun May 10 00:19:36 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Sat, 9 May 2009 21:19:36 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com><mailman.5310.1241809502.11746.python-list@python.org><m2eiuzi92l.fsf@cs.uu.nl><977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com><mailman.5338.1241882849.11746.python-list@python.org><994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com><mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>
Message-ID: <5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>

First of all thanks everybody for putting time with my confusing post
and I apologize for not being clear after so many efforts.

here is my last try (you are free to ignore my request for free
advice)

# -*- coding: utf-8 -*-

class A(object):

    def __unicode__(self):
        return u"?au"

    def __repr__(self):
        return unicode(self).encode("utf-8")

    __str__ = __repr__

a = A()
u1 = unicode(a)
u2 = unicode([a])

now I am not using print so that doesn't matter stdout can print
unicode or not
my naive question is line u2 = unicode([a]) throws
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
1: ordinal not in range(128)

shouldn't list class call unicode on its elements? I was expecting
that
so instead do i had to do this
u3 = "["+u",".join(map(unicode,[a]))+"]"


From anuraguniyal at yahoo.com  Sun May 10 00:21:22 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Sat, 9 May 2009 21:21:22 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com><mailman.5310.1241809502.11746.python-list@python.org><m2eiuzi92l.fsf@cs.uu.nl><977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com><mailman.5338.1241882849.11746.python-list@python.org><994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com><mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org> 
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
Message-ID: <805c54f1-95ca-4947-8f3e-3ec1fdb90c6e@v1g2000prd.googlegroups.com>

and yes replace string by u'\N{COPYRIGHT SIGN}au'
as mentioned earlier non-ascii char may not come correct posted here.

On May 10, 9:19?am, "anuraguni... at yahoo.com" <anuraguni... at yahoo.com>
wrote:
> First of all thanks everybody for putting time with my confusing post
> and I apologize for not being clear after so many efforts.
>
> here is my last try (you are free to ignore my request for free
> advice)
>
> # -*- coding: utf-8 -*-
>
> class A(object):
>
> ? ? def __unicode__(self):
> ? ? ? ? return u"?au"
>
> ? ? def __repr__(self):
> ? ? ? ? return unicode(self).encode("utf-8")
>
> ? ? __str__ = __repr__
>
> a = A()
> u1 = unicode(a)
> u2 = unicode([a])
>
> now I am not using print so that doesn't matter stdout can print
> unicode or not
> my naive question is line u2 = unicode([a]) throws
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
> 1: ordinal not in range(128)
>
> shouldn't list class call unicode on its elements? I was expecting
> that
> so instead do i had to do this
> u3 = "["+u",".join(map(unicode,[a]))+"]"



From nad at acm.org  Sun May 10 00:27:56 2009
From: nad at acm.org (Ned Deily)
Date: Sun, 10 May 2009 00:27:56 -0400
Subject: MacPython 3.0.1 installation problem, no /usr/local/bin/python*
References: <m2vdoad6fd.fsf@yahoo.co.uk>
	<ec96e1390905090735p40bd6c21w5606c521c4c161e5@mail.gmail.com>
Message-ID: <nad-9BA928.00275410052009@ger.gmane.org>

In article 
<ec96e1390905090735p40bd6c21w5606c521c4c161e5 at mail.gmail.com>,
 Benjamin Kaplan <benjamin.kaplan at case.edu> wrote:
> On Sat, May 9, 2009 at 4:30 AM, Raoul Gough <bvdmyrby at jyxk16274849.net>wrote:
> > I just installed MacPython 3.0.1 (woot!) but the installer didn't seem
> > to do an absolutely complete job. According to the ReadMe.txt, "The
> > installer puts [...] command-line tools in /usr/local/bin [...]". This
> > didn't happen - even after the install reported Success, there were no
> > python files or symlinks under /usr/local/bin.
> >
> > Also, I'm guessing there should have been a symlink to the current
> > version under /Library/Frameworks/Python.framework/Versions, which
> > wasn't there either:
> >
> > $ cd /Library/Frameworks/Python.framework
> > $ ls -l Python
> > lrwxr-xr-x  1 root  admin  23 May  9 08:34 Python ->
> > Versions/Current/Python
> > $ ls -l Versions/Current
> > ls: Versions/Current: No such file or directory
> >
> > So I fixed this all up as follows:
> >
> > $ cd /Library/Frameworks/Python.framework/Versions
> > $ sudo ln -s 3.0 Current
> > $ cd /usr/local/bin
> > $ sudo ln -s $(find
> > /Library/Frameworks/Python.framework/Versions/Current/bin -type f) .
> >
> > So did something go wrong with the installer, or is it all supposed to
> > work somehow differently?
> 
> Because Python 3 breaks compatibility with Python 2, the installers don't
> install it as the default. The executable should be at
> /usr/local/bin/python3.0

By default, the 3.0.1 installer does not install any links in 
/usr/local/bin.  To do so, run or re-run the installer, click Customize,  
and then select the "UNIX command-line tools" package.  That creates 
/usr/local/python3.0 and /usr/local/python links, among others.

-- 
 Ned Deily,
 nad at acm.org



From aahz at pythoncraft.com  Sun May 10 00:59:34 2009
From: aahz at pythoncraft.com (Aahz)
Date: 9 May 2009 21:59:34 -0700
Subject: Simple programme - Just want to know whether this is correct way 
	of coding
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
	<7d44d587-15c7-40ea-abe2-6a174f1fd0cd@q14g2000vbn.googlegroups.com>
Message-ID: <gu5mvm$lic$1@panix3.panix.com>

In article <7d44d587-15c7-40ea-abe2-6a174f1fd0cd at q14g2000vbn.googlegroups.com>,
namekuseijin  <namekuseijin at gmail.com> wrote:
>On May 8, 3:37=A0am, guptha <gjango... at gmail.com> wrote:
>>
>> The code Works fine ,but I doubt about the performance issue ,My
>> intention is to send mails concurrently to large number of mail.
>> 1.For every mail id i send It creates a new SMTP object,in case, if i
>> send to 1000 or more ids
>
>why should I help a spammer... ;)

How many subscribers do you think there are to python-list?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From aahz at pythoncraft.com  Sun May 10 01:01:19 2009
From: aahz at pythoncraft.com (Aahz)
Date: 9 May 2009 22:01:19 -0700
Subject: Simple programme - Just want to know whether this is correct way
	of coding
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
Message-ID: <gu5n2v$m0i$1@panix3.panix.com>

In article <49f8cb54-f268-46bc-a585-6d116674d00d at k19g2000prh.googlegroups.com>,
guptha  <gjango.py at gmail.com> wrote:
>
>This is my first programme in python ,I need to know whether my code
>is in the right path of performance
>
>I wrote a code using multithreading to send mails

Here's the Right Way to do this: install your a local mailserver on your
own machine and configure it to send to your external server.  You should
be able to pump hundreds of messages through it in minimal time.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From kay at fiber-space.de  Sun May 10 01:36:36 2009
From: kay at fiber-space.de (kay at fiber-space.de)
Date: Sat, 9 May 2009 22:36:36 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org>
Message-ID: <f964488e-eb74-44b8-a6e8-760d29192cb1@e24g2000vbe.googlegroups.com>

On 8 Mai, 17:48, Andreas Rumpf <Rump... at web.de> wrote:
> Dear Python-users,
>
> I invented a new programming language called "Nimrod" that combines Python's readability with C's performance. Please check it out:http://force7.de/nimrod/
> Any feedback is appreciated.
>
> Regards,
> Andreas Rumpf
>
> ______________________________________________________
> GRATIS f?r alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!
> Jetzt freischalten unterhttp://movieflat.web.de

On a first impression it looks quite pleasant to me, your new
language! Two obvious questions on a Python list.

1) How to interface with Nimrod from Python?
2) Lack of typed hash-tables. Is this one of those particular features
that are planned to be implemented in version 0.80 and summarized
under "generic containers"?


From soumen08 at gmail.com  Sun May 10 01:37:20 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Sun, 10 May 2009 11:07:20 +0530
Subject: confused with subprocess.Popen
In-Reply-To: <4A064847.4080509@mattnordhoff.com>
References: <f6a09c160905080112x2620169fk9249e9469be607ea@mail.gmail.com>
	<4A064847.4080509@mattnordhoff.com>
Message-ID: <f6a09c160905092237h336368c1od45eda6668d9b1e@mail.gmail.com>

Thanks!, i have found that alternately setting shell=True also works


From Scott.Daniels at Acm.Org  Sun May 10 02:19:21 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 23:19:21 -0700
Subject: unicode bit me
In-Reply-To: <5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com><mailman.5310.1241809502.11746.python-list@python.org><m2eiuzi92l.fsf@cs.uu.nl><977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com><mailman.5338.1241882849.11746.python-list@python.org><994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com><mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
Message-ID: <x92dnQm6nsQv7ZvXnZ2dnUVZ_rydnZ2d@pdx.net>

anuraguniyal at yahoo.com wrote:
> class A(object):
>     def __unicode__(self):
>         return u"?au"
>     def __repr__(self):
>         return unicode(self).encode("utf-8")
>     __str__ = __repr__
> a = A()
> u1 = unicode(a)
> u2 = unicode([a])
> 
> now I am not using print so that doesn't matter stdout can print
> unicode or not
> my naive question is line u2 = unicode([a]) throws
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
> 1: ordinal not in range(128)
> 
> shouldn't list class call unicode on its elements? 
 > I was expecting that so instead do i had to do this
 > u3 = "["+u",".join(map(unicode,[a]))+"]"

Why would you expect that?  str([a]) doesn't call str on its elements.
Using our simple expedient:
     class B(object):
         def __unicode__(self):
             return u'unicode'
         def __repr__(self):
             return 'repr'
         def __str__(self):
             return 'str'
     >>> unicode(B())
     u'unicode'
     >>> unicode([B()])
     u'[repr]'
     >>> str(B())
     'str'
     >>> str([B()])
     '[repr]'

Now if you ask _why_ call repr on its elements,
the answer is, "so that the following is not deceptive:

     >>> repr(["a, b", "c"])
     "['a, b', 'c']"
which does not look like a 3-element list.

--Scott David Daniels
Scott.Daniels at Acm.Org


From piet at cs.uu.nl  Sun May 10 02:29:12 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 10 May 2009 08:29:12 +0200
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
	<805c54f1-95ca-4947-8f3e-3ec1fdb90c6e@v1g2000prd.googlegroups.com>
Message-ID: <m2r5yxfp3b.fsf@cs.uu.nl>

>>>>> "anuraguniyal at yahoo.com" <anuraguniyal at yahoo.com> (ac) wrote:

>ac> and yes replace string by u'\N{COPYRIGHT SIGN}au'
>ac> as mentioned earlier non-ascii char may not come correct posted here.

That shouldn't be a problem for any decent new agent when there is a
proper charset declaration in the headers.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From __peter__ at web.de  Sun May 10 02:32:34 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 10 May 2009 08:32:34 +0200
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
Message-ID: <gu5sdr$jk2$00$1@news.t-online.com>

anuraguniyal at yahoo.com wrote:

> First of all thanks everybody for putting time with my confusing post
> and I apologize for not being clear after so many efforts.
> 
> here is my last try (you are free to ignore my request for free
> advice)

Finally! This is the first of your posts that makes sense to me ;)

> # -*- coding: utf-8 -*-
> 
> class A(object):
> 
>     def __unicode__(self):
>         return u"?au"
> 
>     def __repr__(self):
>         return unicode(self).encode("utf-8")
> 
>     __str__ = __repr__
> 
> a = A()
> u1 = unicode(a)
> u2 = unicode([a])
> 
> now I am not using print so that doesn't matter stdout can print
> unicode or not
> my naive question is line u2 = unicode([a]) throws
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
> 1: ordinal not in range(128)

list doesn't have a __unicode__ method. unicode() therefore converts the 
list to str as a fallback and then uses sys.getdefaultencoding() to convert 
the result to unicode.

> shouldn't list class call unicode on its elements? 

No, it calls repr() on its elements. This is done to avoid confusing output:

>>> items = ["a, b", "[c]"]
>>> items
['a, b', '[c]']
>>> "[%s]" % ", ".join(map(str, items))
'[a, b, [c]]'

> I was expecting that so instead do i had to do this
> u3 = "["+u",".join(map(unicode,[a]))+"]"

Peter



From piet at cs.uu.nl  Sun May 10 03:24:36 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 10 May 2009 09:24:36 +0200
Subject: xml in python
References: <f46c52560905080046t4b9611vb304df22703eb744@mail.gmail.com>
	<mailman.5360.1241924170.11746.python-list@python.org>
Message-ID: <m2my9lfmiz.fsf@cs.uu.nl>

>>>>> Shawn Milochik <Shawn at Milochik.com> (SM) wrote:

>SM> On Fri, May 8, 2009 at 3:46 AM, Rustom Mody <rustompmody at gmail.com> wrote:
>>> Can someone give me a heads up on xml parsing in python?
>>> The context is that I want to write a simple docbook to text converter.
>>> DOM is alright -- dont want to break my head with SAX just for performance
>>> when my documents are not likely to be large.
>>> 
>>> My problem is that there seems to be so many nearly equivalent ways (Pyxml?
>>> Amara?) some of which have moved from 3rd party to builtin status that I am
>>> not clear what is the current method of choice.
>>> 
>>> Thanks
>>> --

>SM> I've been using minidom for simple XML processing with success. The
>SM> XML module seems to be the way to go, considering how many of its
>SM> child modules are listed on http://docs.python.org/library/.

>SM> import xml.dom.minidom as minidom

These days ElementTree is considered the most pythonic way.
http://docs.python.org/library/xml.etree.elementtree.html

There is also a reimplementation of the ElementTree API based on libxml2
and libxslt, which has more features but requires a separate install. It
is largely compatible with ElementTree, however.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From nick at craig-wood.com  Sun May 10 03:30:05 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sun, 10 May 2009 02:30:05 -0500
Subject: Problems with datetime.datetime.strptime
References: <4a05458d$0$24784$9b536df3@news.fv.fi>
Message-ID: <slrnh0cun6.mi5.nick@irishsea.home.craig-wood.com>

Tuomas Vesterinen <tuomas.vesterinen at iki.fi> wrote:
>  I hoped that I could get rid of my special module _strptime2 when 
>  porting to Python 3.0. But testing is a disappointment.
[snip]
>  C :
>     strftime('%a %b %e %H:%M:%S %Y')='Sat May  9 11:26:12 2009'
>     strptime('Sat May  9 11:26:12 2009','%a %b %e %H:%M:%S %Y')=
>       'e' is a bad directive in format '%a %b %e %H:%M:%S %Y'
[snip]
>  What to do.

I'd start by checking out the code for python 3 trunk and seeing if I
could fix it. If I could I'd update the unit tests and the
documentation then submit the patch to the python bugtracker.

If I couldn't fix it then I'd report it as a bug.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nick at craig-wood.com  Sun May 10 03:30:05 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sun, 10 May 2009 02:30:05 -0500
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
Message-ID: <slrnh0d0gd.mi5.nick@irishsea.home.craig-wood.com>

anuraguniyal at yahoo.com <anuraguniyal at yahoo.com> wrote:
>  First of all thanks everybody for putting time with my confusing post
>  and I apologize for not being clear after so many efforts.
> 
>  here is my last try (you are free to ignore my request for free
>  advice)
> 
>  # -*- coding: utf-8 -*-
> 
>  class A(object):
> 
>      def __unicode__(self):
>          return u"?au"
> 
>      def __repr__(self):
>          return unicode(self).encode("utf-8")
> 
>      __str__ = __repr__
> 
>  a = A()
>  u1 = unicode(a)
>  u2 = unicode([a])
> 
>  now I am not using print so that doesn't matter stdout can print
>  unicode or not
>  my naive question is line u2 = unicode([a]) throws
>  UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
>  1: ordinal not in range(128)
> 
>  shouldn't list class call unicode on its elements? 

You mean when you call unicode(a_list) it should unicode() on each of
the elements to build the resultq?

Yes that does seem sensible, however list doesn't have a __unicode__
method at all so I guess it is falling back to using __str__ on each
element, and which explains your problem exactly.

If you try your example on python 3 then you don't need the
__unicode__ method at all (all strings are unicode) and you won't have
the problem I predict. (I haven't got a python 3 in front of me at the
moment to test.)

So I doubt you'll find the momentum to fix this since unicode and str
integration was the main focus of python 3, but you could report a
bug.  If you attach a patch to fix it - so much the better!

Here is my demonstration of the problem with python 2.5.2

>> class A(object):
...     def __unicode__(self):
...         return u"\N{COPYRIGHT SIGN}au"
...     def __repr__(self):
...         return unicode(self).encode("utf-8")
...     __str__ = __repr__
...
>>> a = A()
>>> str(a)
'\xc2\xa9au'
>>> repr(a)
'\xc2\xa9au'
>>> unicode(a)
u'\xa9au'
>>> L=[a]
>>> str(L)
'[\xc2\xa9au]'
>>> repr(L)
'[\xc2\xa9au]'
>>> unicode(L)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
1: ordinal not in range(128)
>>> unicode('[\xc2\xa9au]')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
1: ordinal not in range(128)
>>> L.__unicode__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'list' object has no attribute '__unicode__'
>>> unicode(str(L),"utf-8")
u'[\xa9au]'

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From denize.paul at gmail.com  Sun May 10 03:32:07 2009
From: denize.paul at gmail.com (pdenize)
Date: Sun, 10 May 2009 00:32:07 -0700 (PDT)
Subject: Help needed with filenames
Message-ID: <64840f40-af1c-4e37-a0ab-d928594fca63@v35g2000pro.googlegroups.com>

I have a program that reads files using glob and puts them into an XML
file in UTF-8 using
  unicode(file, sys.getfilesystemencoding()).encode("UTF-8")
This all works fine including all the odd characters like accents etc.

However I also print what it is doing and someone pointed out that
many characters are not printing correctly in the Windows command
window.

I have tried to figure this out but simply get lost in the translation
stuff.
if I just use print filename it has characters that dont match the
ones in the filename (I sorta expected that).
So I tried print unicode(file, sys.getfilesystemencoding()) expecting
the correct result, but no.
UnicodeEncodeError: 'charmap' codec can't encode character u'\u2013'

I did notice that when a windows command window does a directory
listing of these files the characters seem to be translated into close
approximations (long dash to minus, special double quotes to simple
double quotes, but still retains many of the accent chars).  I looked
at translate to do this but did not know how to determine which
characters to map.

Can anyone tell me what I should be doing here?


From __peter__ at web.de  Sun May 10 03:33:40 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 10 May 2009 09:33:40 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org>
	<mailman.5361.1241924171.11746.python-list@python.org>
Message-ID: <gu600c$pvt$00$1@news.t-online.com>

MRAB wrote:

> Marco wrote:
>> Hi,
>> 
>> There happened something that I do not understand. Actually I don't even
>> know how it can be possible.
>> 
>> I import a module and then the name space of the importing module seems
>> do be overwritten.
>> 
>> my_name = __name__
>> print my_name
>> print len(dir())
>> from x import y as z
>> print __name__
>> print len(dir())
>> print my_name
>> 
>> ->
>> __main__
>> 119
>> x
>> 117
>> unhandled NameError "name 'my_name' is not defined"
>> 
>> The module x is from me, and I am not aware of doing anything cruel
>> there. What evil thing can be done in its sub module that can result in
>> that strange thing?
>> 
> You'd have to show us the module. Try to make the smallest module that
> has the same effect.

$ cat x.py
import sys
globals().update(zip(*(range(110),)*2))
y = 42
print __name__
if __name__ == "__main__":
    a = b = 42
print len(dir())
from x import y as z
try:
    print my_name
except NameError, e:
    print 'unhandled NameError: "%s"' % e
    sys.exit()

$ python x.py
__main__
119
x
117
unhandled NameError: "name 'my_name' is not defined"

;)




From M8R-gqmgb4 at mailinator.com  Sun May 10 03:40:04 2009
From: M8R-gqmgb4 at mailinator.com (uuid)
Date: Sun, 10 May 2009 09:40:04 +0200
Subject: xml in python
References: <mailman.5360.1241924170.11746.python-list@python.org>
	<m2my9lfmiz.fsf@cs.uu.nl>
Message-ID: <4a0684d4_2@news.arcor-ip.de>

On 2009-05-10 09:24:36 +0200, Piet van Oostrum <piet at cs.uu.nl> said:
>> 
> 
> These days ElementTree is considered the most pythonic way.
> http://docs.python.org/library/xml.etree.elementtree.html
> 
> There is also a reimplementation of the ElementTree API based on libxml2
> and libxslt, which has more features but requires a separate install. It
> is largely compatible with ElementTree, however.

Indeed - elementtree and its blazing C implementation celementtree are 
included in the standard install.

However, I would also recommend checking out the latter option - lxml. 
It's very fast, has an elementtree compatible API and sports some 
tricks like XPath and XSLT. There's comprehensive documentation as well 
als tutorials, hints and tips here: http://codespeak.net/lxml/



From martin at v.loewis.de  Sun May 10 03:40:44 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 10 May 2009 09:40:44 +0200
Subject: Help needed with filenames
In-Reply-To: <64840f40-af1c-4e37-a0ab-d928594fca63@v35g2000pro.googlegroups.com>
References: <64840f40-af1c-4e37-a0ab-d928594fca63@v35g2000pro.googlegroups.com>
Message-ID: <4a0684fc$0$24009$9b622d9e@news.freenet.de>

> Can anyone tell me what I should be doing here?

The console uses the "OEM code page". The Windows conversion
routine from Unicode to the OEM code page provides the lossy
conversion that you observe in listing.

Unfortunately, the OEM code page conversion is not available
from Python. What you can do is to use

  u.encode(sys.stdout.encoding, "replace")

This will replace unprintable characters with question marks.

Regards,
Martin


From yinon.me at gmail.com  Sun May 10 04:19:29 2009
From: yinon.me at gmail.com (Yinon Ehrlich)
Date: Sun, 10 May 2009 01:19:29 -0700 (PDT)
Subject: Help needed with filenames
References: <64840f40-af1c-4e37-a0ab-d928594fca63@v35g2000pro.googlegroups.com>
Message-ID: <0e0974b3-781e-4b6b-a8d6-7448b31b49e2@o14g2000vbo.googlegroups.com>


> I did notice that when a windows command window does a directory
> listing of these files the characters seem to be translated into close
> approximations (long dash to minus, special double quotes to simple
> double quotes, but still retains many of the accent chars). ?I looked
> at translate to do this but did not know how to determine which
> characters to map.
>
> Can anyone tell me what I should be doing here?

Hi,

Seems like your problem is just with the correct representation of
those characters in Windows command-line.
I have seen two solutions for that:
* Right-click on the top bar of the the command-line window, go to
"properties--> Font", select a font that shows all characters
correctly.
* Even better: use http://sourceforge.net/projects/console - much
better that Windows' default console.

Good luck,
  Yinon


From http  Sun May 10 04:40:56 2009
From: http (Paul Rubin)
Date: 10 May 2009 01:40:56 -0700
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org>
Message-ID: <7xd4ah73l3.fsf@ruckus.brouhaha.com>

Andreas Rumpf <Rumpf_A at web.de> writes:
> I invented a new programming language called "Nimrod" that combines
> Python's readability with C's performance. Please check it out:
> http://force7.de/nimrod/ Any feedback is appreciated.

Looks nice in many ways.  You also know about PyPy and Felix
(felix.sf.net)?

It seems a little bit hackish that the character type is a byte.
Python did something like that but it ended up causing a lot of
hassles when dealing with real Unicode.  I think you have to bite
the bullet and have separate byte and char types, where char=unicode.

It scares me a little about how there are references that can have
naked pointers, escape the gc, etc.  It would be good if the type
system were powerful enough to guarantee the absence of these effects
in some piece of data, unless the data is somehow marked with an
"unsafe" type.

I'd like to see ML-like algebraic types with pattern matching, not
just tuple unpacking.  

The generic system should be able to analyze the AST of type
parameters, e.g. iterator<T> would be able to automatically generate
an iterator over a list, a tree, or some other type of structure, by
actually figuring out at compile time how T is constructed.

It's sort of surprising that the compiler is written in a Pascal
subset.  Why not implement in Nimrod directly, and bootstrap through C?

The language and library are missing arbitrary precision integer
arithmetic, using GMP or something like that.

It would be good to also be able to have value serialization and
deserialization to both human readable (nested lists, etc) and binary
(for IPC) formats.

It's not obvious from the blurbs whether simple functional programming
is supported, e.g. how would you implement a function like "map" or
"filter"?  What would the types be of those two functions?

The roadmap says you might implement threading with transactional
memory.  How will the transactional memory interact with mutable data?
Are you going to use OS threads, lightweight threads, or both?


From anuraguniyal at yahoo.com  Sun May 10 05:46:46 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Sun, 10 May 2009 02:46:46 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl> 
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com> 
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl> 
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
	<slrnh0d0gd.mi5.nick@irishsea.home.craig-wood.com>
Message-ID: <05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>

ok that explains it,
so
unicode(obj) calls __unicode__ on that object and if it isn't there
__repr__ is used
__repr__ of list by default return a str even if __repr__ of element
is unicode


so my only solution looks like to use my own list class everywhere i
use list
class mylist(list):
    def __unicode__(self):
        return u"["+u''.join(map(unicode,self))+u"]"


From deets at nospam.web.de  Sun May 10 05:59:58 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 10 May 2009 11:59:58 +0200
Subject: unicode bit me
In-Reply-To: <05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
	<slrnh0d0gd.mi5.nick@irishsea.home.craig-wood.com>
	<05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>
Message-ID: <76nmsuF1djnc0U1@mid.uni-berlin.de>

anuraguniyal at yahoo.com schrieb:
> ok that explains it,
> so
> unicode(obj) calls __unicode__ on that object and if it isn't there
> __repr__ is used
> __repr__ of list by default return a str even if __repr__ of element
> is unicode
> 
> 
> so my only solution looks like to use my own list class everywhere i
> use list
> class mylist(list):
>     def __unicode__(self):
>         return u"["+u''.join(map(unicode,self))+u"]"

Or you use a custom unicode_list-function whenever you care to print out 
  a list.

Diez


From Shawn at Milochik.com  Sun May 10 07:06:03 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Sun, 10 May 2009 07:06:03 -0400
Subject: "Beginning Python Visualization" by Shai Vaingast
In-Reply-To: <c38538d6-c9bf-425d-b23f-7b848192c677@y34g2000prb.googlegroups.com>
References: <c38538d6-c9bf-425d-b23f-7b848192c677@y34g2000prb.googlegroups.com>
Message-ID: <2dc0c81b0905100406i2bcc8152i10c5ec8b67933ede@mail.gmail.com>

Thanks for the review and the podcast. I ordered the book on Friday. I
look forward to playing with it. Also (assuming you're Ron Stephens),
thanks for the Python 411 podcast. It's a great resource, and I
recommend it to all list members.

Shawn


From steve at REMOVE-THIS-cybersource.com.au  Sun May 10 08:14:35 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 10 May 2009 12:14:35 GMT
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<gu55va$uba$2@lust.ihug.co.nz>
	<vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d@pdx.net>
	<gu5bbr$1ua$1@lust.ihug.co.nz>
Message-ID: <0216b85e$0$20647$c3e8da3@news.astraweb.com>

On Sun, 10 May 2009 13:41:15 +1200, Lawrence D'Oliveiro wrote:

> If I had to print out all the code and documentation I have to look at,
> I'd need to add another room to my house.


You are allowed to throw it away when you're done with it :)



-- 
Steven


From brian at sweetapp.com  Sun May 10 08:16:41 2009
From: brian at sweetapp.com (Brian Quinlan)
Date: Sun, 10 May 2009 13:16:41 +0100
Subject: Java-style futures in Python - only better
Message-ID: <4A06C5A9.7070102@sweetapp.com>

Hey all,

I've been working on an Java-style futures implementation in Python. 
Futures are a way of representing asynchronous operations e.g. 
operations that are run in another thread or process. The are are a easy 
but powerful way of parallelizing sequential operations. The also 
provide a consistent interface across implementations e.g. they can 
provide the same interface to threading and to multiprocessing.

For example:

def is_prime(n):
     "Return True iff n is prime"
     ...

def check_primes(numbers):
     return map(is_prime, numbers)

Could be parallelized as:

def check_primes(numbers):
     # ProcessPoolExecutor will create one worker process
     # per CPU if called without arguments. Using threads
     # is valueless because of the GIL.
     with futures.ProcessPoolExecutor() as executor:
         return executor.map(is_prime, numbers)

A more complex example:

def load_url(url, timeout):
     return urllib.request.urlopen(url, timeout=timeout).read()

### Download the content of some URLs - ignore failures.
def download_urls(urls, timeout=60):
     url_to_content = {}
     for url in urls:
         try:
             url_to_content[url] = load_url(url, timeout=timeout)
         except:
             pass
     return url_to_content

Could be parallelized as:

# Making this a global variable used any many functions ensures that
# the global thread count is kept under control.
executor = futures.ThreadPoolExecutor(50)
def download_urls(urls, timeout=60):
     url_to_content = {}
     # Run load_url for every url and get the result as a FuturesList.
     fs = executor.run_to_futures(
             (functools.partial(load_url, url, timeout) for url in urls),
             timeout=timeout)
     for url, future in zip(urls, fs.successful_futures()):
         url_to_content[url] = future.result()
     return url_to_content


The Python 3.0+ code is here:
http://code.google.com/p/pythonfutures/source

Any feedback on the API would be very much appreciated!

Cheers,
Brian




From aahz at pythoncraft.com  Sun May 10 08:27:05 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 May 2009 05:27:05 -0700
Subject: Missing c.l.py posts (was Re: php to python code converter)
References: <4A044D71.1000500@gmail.com> <1241812993.9340.3.camel@aalcdl07>
	<mailman.5314.1241816812.11746.python-list@python.org>
Message-ID: <gu6h6p$d5v$1@panix3.panix.com>

In article <mailman.5314.1241816812.11746.python-list at python.org>,
MRAB  <google at mrabarnett.plus.com> wrote:
>J. Cliff Dyer wrote:
>> On Fri, 2009-05-08 at 17:19 +0200, Pascal Chambon wrote:
>>>
>>> PS : Am I the only one having most of answers rejected by the
>>> antispam 
>>> system of python-list ? That's humiliating :p
>> 
>> I've had several messages not make it through.
>> 
>> :(
> 
>Same here ("Message has a suspicious header").

I've been trying to investigate several instances of posts to
comp.lang.python.announce getting approved and making it out to the
mailing list but not the newsgroup.  In each case, reposting as plain
text fixed the problem.  I suggest that anyone having similar problems on
c.l.py do the same thing.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From joshua.pearce at gmail.com  Sun May 10 08:28:03 2009
From: joshua.pearce at gmail.com (joshua.pearce at gmail.com)
Date: Sun, 10 May 2009 05:28:03 -0700 (PDT)
Subject: Learning C++ for Python Development
Message-ID: <5d97efc2-af41-4dd6-a243-50f85d54746c@s16g2000vbp.googlegroups.com>

I am a recovering C# web developer who has recently picked up Django
and I'm loving it.

I would eventually like to get a job as a Django/Python developer. It
seems that many Python jobs require that you also be a C++ developer.
While I want to remain primarily a web developer, I don't want be
stuck doing CRUD applications, so I would like to learn C++ for Python
development. I have taken two basic programming courses in straight up
C++, no STL, Boost or anything like that, but I do have a very basic
knowledge of the language.

Can you folks suggest some Python packages which use C++ and are
relevant for web development, so I can dig through the source and
contribute in some way?

Or, just give me some general advice on learning C++ for Python?

P.S. I want to develop on Linux not Windows.

Thanks!


From aahz at pythoncraft.com  Sun May 10 08:28:52 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 May 2009 05:28:52 -0700
Subject: OT (humor): 'import antigravity' in action!
References: <mailman.5354.1241924166.11746.python-list@python.org>
Message-ID: <gu6ha4$sc9$1@panix3.panix.com>

In article <mailman.5354.1241924166.11746.python-list at python.org>,
Shawn Milochik  <Shawn at Milochik.com> wrote:
>
>I know you've probably all seen this 50 times, but just in case:
>http://xkcd.com/353/
>
>And here's the result:
>http://icanhascheezburger.com/2009/05/06/funny-pictures-behavior-20/

Thanks!
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From aahz at pythoncraft.com  Sun May 10 08:42:16 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 May 2009 05:42:16 -0700
Subject: How do I test the integrity of a Python installation in Debian and
	Ubuntu
References: <mailman.5282.1241783298.11746.python-list@python.org>
Message-ID: <gu6i38$jhk$1@panix3.panix.com>

In article <mailman.5282.1241783298.11746.python-list at python.org>,
Geoff Gardiner  <ggardiner at iee.org> wrote:
>
>gegard at gegard:~$ python
>Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52)
>[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
>Type "help", "copyright", "credits" or "license" for more information.
>>>> from test import regrtest
>>>> regrtest.main()
>test_grammar
>test_grammar skipped -- No module named test_grammar
>... <etc> more of the same...
>9 tests skipped:
>    test_builtin test_doctest test_doctest2 test_exceptions
>    test_grammar test_opcodes test_operations test_types test_unittest
>Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File "/usr/lib/python2.5/test/regrtest.py", line 416, in main
>    e = _ExpectedSkips()
>  File "/usr/lib/python2.5/test/regrtest.py", line 1321, in __init__
>    from test import test_socket_ssl
>ImportError: cannot import name test_socket_ssl

What directory are you running this from?  What happens if you switch to
running "python Lib/test/regrtest.py"?  Taking a closer look, this looks
more like a plain import error.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From socyl at 987jk.com.invalid  Sun May 10 08:52:21 2009
From: socyl at 987jk.com.invalid (kj)
Date: Sun, 10 May 2009 12:52:21 +0000 (UTC)
Subject: Q's on my first python script
Message-ID: <gu6im5$1hi$1@reader1.panix.com>


Below is my very firs python script.

This was just a learning exercise; the script doesn't do anything
terribly exciting: for an argument of the form YYMMDD (year, month,
day) it prints out the corresponding string YYMMDDW, where W is a
one-letter abbreviation for the day of the week.  E.g.

% wd 090511
090511M

The script runs OK, but I can still see a few areas of improvement,
for which I could use your advice.

1. The name of the BadArgument exception class defined in the script
   does not seem to me sufficiently specific.  If one were to import
   the script in order to reuse its wkday_abbrev function, I'd like
   this exception's name to be more unequivocally tied to this
   script.  What I'm looking for is something like a "namespace"
   for this script.  What's the pythonic way to construct a namespace?

2. In some python modules I've seen the idiom

   if __name__ == "__main__":
      # run some tests here

   I'd like to set up tests for this script, mostly to ensure that
   it handles the error cases properly, but I'm alread using the
   idiom above to actually run the script under normal operation.
   What's the typical python idiom for running tests on a *script*
   (as opposed to a module that is normally not supposed to be run
   directly)?

3. Still on the subject of testing, how does one capture in a
   variable the output that would normally have gone to stdout or
   stderr?

4. What's the python way to emit warnings?  (The script below should
   warn the user that arguments after the first one are ignored.)

5. The variable wd is meant to be "global" to the script.  In other
   languages I've programmed in I've seen some typographic convention
   used for the name of such variables (e.g. all caps) to signal
   this widened scope.  Does python have such a convention?

Any comments/suggestions on these questions, or anything else about
the script, would be much appreciated.

TIA!

kynn


----------------------------------------------------------------
from optparse import OptionParser
import re
import datetime
import sys

class BadArgument(Exception): pass

wd = ("M", "T", "W", "H", "F", "S", "U")

def wkday_abbrev(str):
  try:
    mm = re.match("(\d{2})(\d{2})(\d{2})\Z", str)

    y, m, d = map(lambda x: int(mm.group(x)), (1,2,3))

    if y < 38: y = y + 1900
    else: y = y + 2000

    return wd[datetime.datetime(y, m, d).weekday()]
  except (AttributeError, ValueError):
    raise BadArgument()


def main():

  usage = '''Usage: %prog [options] YYMMDD
       %prog -h|--help
'''

  parser = OptionParser(usage=usage)
  parser.add_option("-n", "--no-newline", dest="nonl",
                    action="store_true", help="omit newline in output")

  (options, args) = parser.parse_args();

  try:
    sys.stdout.write("%s%s" % (args[0], wkday_abbrev(args[0])))
    if not options.nonl: print

  except (IndexError, BadArgument):
    print usage
    sys.exit(1)
  except: raise

if __name__ == "__main__": main()

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From skip at pobox.com  Sun May 10 09:11:30 2009
From: skip at pobox.com (skip at pobox.com)
Date: Sun, 10 May 2009 08:11:30 -0500
Subject: Missing c.l.py posts (was Re: php to python code converter)
In-Reply-To: <gu6h6p$d5v$1@panix3.panix.com>
References: <4A044D71.1000500@gmail.com> <1241812993.9340.3.camel@aalcdl07>
	<mailman.5314.1241816812.11746.python-list@python.org>
	<gu6h6p$d5v$1@panix3.panix.com>
Message-ID: <18950.53890.865512.979083@montanaro.dyndns.org>


    >>>> PS : Am I the only one having most of answers rejected by the
    >>>> antispam system of python-list ? That's humiliating :p
    >>> 
    >>> I've had several messages not make it through.
    >>> 
    >>> :(
    >> 
    >> Same here ("Message has a suspicious header").

    Aahz> I've been trying to investigate several instances of posts to
    Aahz> comp.lang.python.announce getting approved and making it out to
    Aahz> the mailing list but not the newsgroup.  In each case, reposting
    Aahz> as plain text fixed the problem.  I suggest that anyone having
    Aahz> similar problems on c.l.py do the same thing.

The problem lies with moi.  The ham/spam database had grown rather huge.  I
tossed out a bunch of older ham and spam messages from the database and
retrained.  That caused a large fraction of new posts to be held as
"unsure".  Unfortunately, I didn't notice that for a couple days.  I added a
couple hundred of the recently held hams and spams to the database and
retrained last night.  This morning nothing new was held.  Hopefully that
will solve the problem.

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/
    America's vaunted "free press" notwithstanding, story ideas that expose
    the unseemly side of actual or potential advertisers tend to fall by the
    wayside.  Not quite sure why.  -- Jim Thornton


From ggardiner at iee.org  Sun May 10 09:26:40 2009
From: ggardiner at iee.org (Geoff Gardiner)
Date: Sun, 10 May 2009 14:26:40 +0100
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
In-Reply-To: <gu6i38$jhk$1@panix3.panix.com>
References: <mailman.5282.1241783298.11746.python-list@python.org>
	<gu6i38$jhk$1@panix3.panix.com>
Message-ID: <4A06D610.5090107@iee.org>

Aahz wrote:
> ....
> What directory are you running this from?  What happens if you switch to
> running "python Lib/test/regrtest.py"?  Taking a closer look, this looks
> more like a plain import error.
>   

Thank you for your suggestion.

I couldn't do quite that because there's no Lib, but instead (in Ubuntu
Hardy, this time):
....
gegard at gegard:~$ cd /usr/lib/python2.5/
gegard at gegard:/usr/lib/python2.5$ python test/regrtest.py
test_grammar
test_grammar skipped -- No module named test_grammar
test_opcodes
test_opcodes skipped -- No module named test_opcodes
test_operations
test_operations skipped -- No module named test_operations
test_builtin
test_builtin skipped -- No module named test_builtin
test_exceptions
test_exceptions skipped -- No module named test_exceptions
test_types
test_types skipped -- No module named test_types
test_unittest
test_unittest skipped -- No module named test_unittest
test_doctest
test_doctest skipped -- No module named test_doctest
test_doctest2
test_doctest2 skipped -- No module named test_doctest2
9 tests skipped:
    test_builtin test_doctest test_doctest2 test_exceptions
    test_grammar test_opcodes test_operations test_types test_unittest
Traceback (most recent call last):
  File "test/regrtest.py", line 1384, in <module>
    main()
  File "test/regrtest.py", line 416, in main
    e = _ExpectedSkips()
  File "test/regrtest.py", line 1321, in __init__
    from test import test_socket_ssl
ImportError: cannot import name test_socket_ssl
gegard at gegard:/usr/lib/python2.5$

Also
gegard at gegard:~$ locate */test_socket_ssl.*
gegard at gegard:~$ #returns nothing

And
gegard at gegard:~$ locate /usr/lib/python2.5/test/test_*.*
/usr/lib/python2.5/test/test_support.py
/usr/lib/python2.5/test/test_support.pyc
gegard at gegard:~$

All the best,
Geoff




From jnoller at gmail.com  Sun May 10 09:35:03 2009
From: jnoller at gmail.com (Jesse Noller)
Date: Sun, 10 May 2009 09:35:03 -0400
Subject: Get multiprocessing.Queue to do priorities
In-Reply-To: <4a05ff89_1@news.arcor-ip.de>
References: <4a05b27a_2@news.arcor-ip.de> <4a05b6c6_2@news.arcor-ip.de>
	<28KdnTocUpw2X5jXnZ2dnUVZ_sudnZ2d@pdx.net>
	<529683651263584828.031438address_is-invalid.invalid@news.arcor.de>
	<-vKdnex07oQzQpjXnZ2dnUVZ_hZi4p2d@pdx.net>
	<4a05ff89_1@news.arcor-ip.de>
Message-ID: <4222a8490905100635o7b64bb88n403feae50a320973@mail.gmail.com>

On Sat, May 9, 2009 at 6:11 PM, uuid <M8R-gqmgb4 at mailinator.com> wrote:
> The Queue module, apparently, is thread safe, but *not* process safe. If you
> try to use an ordinary Queue, it appears inaccessible to the worker process.
> (Which, after all, is quite logical, since methods for moving items between
> the threads of the same process are quite different from inter-process
> communication.) It appears that creating a manager that holds a shared queue
> might be an option
> (http://stackoverflow.com/questions/342556/python-2-6-multiprocessing-queue-compatible-with-threads).

Using a manager, or submitting a patch which adds priority queue to
the multiprocessing.queue module is the correct solution for this.

You can file an enhancement in the tracker, and assign/add me to it,
but without a patch it may take me a bit (wicked busy right now).

jesse


From tuomas.vesterinen at iki.fi  Sun May 10 10:18:30 2009
From: tuomas.vesterinen at iki.fi (Tuomas Vesterinen)
Date: Sun, 10 May 2009 17:18:30 +0300
Subject: Problems with datetime.datetime.strptime
In-Reply-To: <slrnh0cun6.mi5.nick@irishsea.home.craig-wood.com>
References: <4a05458d$0$24784$9b536df3@news.fv.fi>
	<slrnh0cun6.mi5.nick@irishsea.home.craig-wood.com>
Message-ID: <4a06e236$0$24790$9b536df3@news.fv.fi>

Nick Craig-Wood wrote:
> Tuomas Vesterinen <tuomas.vesterinen at iki.fi> wrote:
>>  I hoped that I could get rid of my special module _strptime2 when 
>>  porting to Python 3.0. But testing is a disappointment.
> [snip]
>>  C :
>>     strftime('%a %b %e %H:%M:%S %Y')='Sat May  9 11:26:12 2009'
>>     strptime('Sat May  9 11:26:12 2009','%a %b %e %H:%M:%S %Y')=
>>       'e' is a bad directive in format '%a %b %e %H:%M:%S %Y'
> [snip]
>>  What to do.
> 
> I'd start by checking out the code for python 3 trunk and seeing if I
> could fix it. If I could I'd update the unit tests and the
> documentation then submit the patch to the python bugtracker.
> 
> If I couldn't fix it then I'd report it as a bug.
> 

Thanks. I have a Python implementation here:

   http://kotisivu.dnainternet.net/tuovest1/booker/booker-0.1.2.tar.gz

See folder booker/csvcnt modules _strptime2.py and time_forms.py.

TV


From paul at boddie.org.uk  Sun May 10 10:27:13 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Sun, 10 May 2009 07:27:13 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
Message-ID: <09709e90-6c58-47f1-94e7-43605875d3ae@l28g2000vba.googlegroups.com>

On 10 Mai, 10:40, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>
> Looks nice in many ways. ?You also know about PyPy and Felix
> (felix.sf.net)?

Try http://felix-lang.org/ for the latter, I believe.

Paul


From M8R-gqmgb4 at mailinator.com  Sun May 10 10:30:53 2009
From: M8R-gqmgb4 at mailinator.com (uuid)
Date: Sun, 10 May 2009 16:30:53 +0200
Subject: Get multiprocessing.Queue to do priorities
References: <4a05b27a_2@news.arcor-ip.de> <4a05b6c6_2@news.arcor-ip.de>
	<28KdnTocUpw2X5jXnZ2dnUVZ_sudnZ2d@pdx.net>
	<529683651263584828.031438address_is-invalid.invalid@news.arcor.de>
	<-vKdnex07oQzQpjXnZ2dnUVZ_hZi4p2d@pdx.net>
	<4a05ff89_1@news.arcor-ip.de>
	<mailman.5376.1241962506.11746.python-list@python.org>
Message-ID: <4a06e51d_2@news.arcor-ip.de>

Dear Jesse,
thanks for the hint.

I see you are already assigned to the FIFO bug 
(http://bugs.python.org/issue4999), so I won't burden you even more. 
Clearly, a reliable FIFO behavior of multiprocessing.Queue helps more 
than a priority queue, since it can be used to build one, so that 
should really be the first thing to fix.

In the meantime, I think I'll whip up a hack that uses sort of a 
bucket- strategy: fill up a prioritized heapq, and then, in regular 
intervals, unload its contents into a size-limited multiprocessing 
queue.

I'll post this as soon as it works.

-u

On 2009-05-10 15:35:03 +0200, Jesse Noller <jnoller at gmail.com> said:

> Using a manager, or submitting a patch which adds priority queue to
> the multiprocessing.queue module is the correct solution for this.
> 
> You can file an enhancement in the tracker, and assign/add me to it,
> but without a patch it may take me a bit (wicked busy right now).
> 
> jesse




From piet at cs.uu.nl  Sun May 10 11:10:50 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 10 May 2009 17:10:50 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org>
	<mailman.5361.1241924171.11746.python-list@python.org>
	<gu600c$pvt$00$1@news.t-online.com>
Message-ID: <m2skjddmdh.fsf@cs.uu.nl>

>>>>> Peter Otten <__peter__ at web.de> (PO) wrote:

>PO> $ cat x.py
>PO> import sys
>PO> globals().update(zip(*(range(110),)*2))
>PO> y = 42
>PO> print __name__
>PO> if __name__ == "__main__":
>PO>     a = b = 42
>PO> print len(dir())
>PO> from x import y as z
>PO> try:
>PO>     print my_name
>PO> except NameError, e:
>PO>     print 'unhandled NameError: "%s"' % e
>PO>     sys.exit()

>PO> $ python x.py
>PO> __main__
>PO> 119
>PO> x
>PO> 117
>PO> unhandled NameError: "name 'my_name' is not defined"

This is perfectly normal. python x.py command runs normally (although
the globals().update is a very weird thing to do), until the from x
import y command. Then x.py is loaded again but now as the module 'x'
instead of '__main__'. Python doesn't know it's the same file, and
actually it doesn't want to know. It only knows it when you do import
twice on the same file. Not when you run it as a main script first and
then imports it. **This is a thing you shouldn't do**.
There are now two namespaces: one for __main__ and one for x. These are
distinct and have no relationship. 

The reason that the first number is 119 and the second is 117 is that
while importing x the variables a and b are not created.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From chiendarret at gmail.com  Sun May 10 11:18:51 2009
From: chiendarret at gmail.com (Francesco Pietra)
Date: Sun, 10 May 2009 17:18:51 +0200
Subject: strip part of string
Message-ID: <b87c422a0905100818w1bc2db1fpf640ca987482ba79@mail.gmail.com>

Hi:
I would like to delete everything from column 54 on for each line
beginning with "ATOM". In the example in the attachment (sorry for the
attachment; I found no way with Google mail to have plain text mail)
the new line would become:

ATOM     49  NH1 ARG    84      84.628  41.570  44.395

without any blank space to the right. . Everything else should remain
at its original column. I have been looking for ???? statement, unable
(my big fault ) to find a right one. I tried with slices % but it
becomes unnecessarily complex.


Thanks
francesco
-------------- next part --------------
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From google at mrabarnett.plus.com  Sun May 10 11:34:42 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 10 May 2009 16:34:42 +0100
Subject: strip part of string
In-Reply-To: <b87c422a0905100818w1bc2db1fpf640ca987482ba79@mail.gmail.com>
References: <b87c422a0905100818w1bc2db1fpf640ca987482ba79@mail.gmail.com>
Message-ID: <4A06F412.8050405@mrabarnett.plus.com>

Francesco Pietra wrote:
> Hi:
> I would like to delete everything from column 54 on for each line
> beginning with "ATOM". In the example in the attachment (sorry for the
> attachment; I found no way with Google mail to have plain text mail)
> the new line would become:
> 
> ATOM     49  NH1 ARG    84      84.628  41.570  44.395
> 
> without any blank space to the right. . Everything else should remain
> at its original column. I have been looking for ???? statement, unable
> (my big fault ) to find a right one. I tried with slices % but it
> becomes unnecessarily complex.
> 
data = open('rec.crg', 'r')
outp = open('rec.strip.crg', 'w')

for L in data:
    if L[3] == 'M':
      L = L[:55].rstrip() + '\n'
    outp.write(L)

data.close()
outp.close()


Note that .rstrip() will strip all whitespace from the right-hand end of
the string, including the '\n' at the end of the string/line, so a new
'\n' has to be added.


From steve at REMOVE-THIS-cybersource.com.au  Sun May 10 11:36:17 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 10 May 2009 15:36:17 GMT
Subject: strip part of string
References: <mailman.5377.1241968734.11746.python-list@python.org>
Message-ID: <0216e7a2$0$20647$c3e8da3@news.astraweb.com>

On Sun, 10 May 2009 17:18:51 +0200, Francesco Pietra wrote:

> Hi:
> I would like to delete everything from column 54 on for each line
> beginning with "ATOM". In the example in the attachment (sorry for the
> attachment; I found no way with Google mail to have plain text mail) the
> new line would become:
> 
> ATOM     49  NH1 ARG    84      84.628  41.570  44.395

if line.startswith("ATOM"):
    line = line[0:54].rstrip()

should do what you want.



-- 
Steven


From zooko at zooko.com  Sun May 10 11:41:33 2009
From: zooko at zooko.com (Zooko Wilcox-O'Hearn)
Date: Sun, 10 May 2009 09:41:33 -0600
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <20090509153716.D44633A4080@sparrow.telecommunity.com>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<4A059639.7040505@v.loewis.de>
	<20090509153716.D44633A4080@sparrow.telecommunity.com>
Message-ID: <7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>

On May 9, 2009, at 9:39 AM, P.J. Eby wrote:

> It would be really straightforward, though, for someone to  
> implement an easy_install variant that does this.  Just invoke  
> "easy_install -Zmaxd /some/tmpdir packagelist" to get a full set of  
> unpacked .egg directories in /some/tmpdir, and then move the  
> contents of the resulting .egg subdirs to the target location,  
> renaming EGG-INFO subdirs to projectname-version.egg-info subdirs.

Except for the renaming part, this is exactly what GNU stow does.

> (Of course, this ignores the issue of uninstalling previous  
> versions, or overwriting of conflicting files in the target -- does  
> pip handle these?)

GNU stow does handle these issues.

Regards,

Zooko


From sjmachin at lexicon.net  Sun May 10 11:52:51 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 10 May 2009 08:52:51 -0700 (PDT)
Subject: strip part of string
References: <mailman.5377.1241968734.11746.python-list@python.org>
Message-ID: <bcaaeff9-6a18-4b1b-b5c9-467369bb36e6@n7g2000prc.googlegroups.com>

On May 11, 1:18?am, Francesco Pietra <chiendar... at gmail.com> wrote:
> Hi:
> I would like to delete everything from column 54 on for each line
> beginning with "ATOM". In the example in the attachment (sorry for the
> attachment; I found no way with Google mail to have plain text mail)

Many of your audience won't have seen your quite unnecessary
attachment; you could have in-lined the text just like this:
[except that I've deleted empty lines, and chopped some irrelevant
stuff off the right hand end of some lines so that line-wrapping won't
confuse anybody any more than they are already :-)
]

8<---
# Sample line
#           1         2         3         4         5
# 012345678901234567890123456789012345678901234567890123456789
# ATOM     49  NH1 ARG    84      84.628  41.570  44.395  0.00
data = open('rec.crg', 'r')
outp = open('rec.strip.crg', 'w')
for L in data:
   if L[3] == 'M':
     L = L[:55] ???????
   outp.write(L)
8<---

> the new line would become:
>
> ATOM ? ? 49 ?NH1 ARG ? ?84 ? ? ?84.628 ?41.570 ?44.395
>
> without any blank space to the right. . Everything else should remain
> at its original column. I have been looking for ???? statement, unable
> (my big fault ) to find a right one. I tried with slices % but it
> becomes unnecessarily complex.

You wish to retain 54 characters, but are retaining 55. You need a
newline on the end of the line. So the statement
    L = L[:55]
should be
    L = L[:54] + '\n'
You may wish to precede that with
    assert len(L) >= 54
You may wish to change
    if L[3] == 'M':
to
    if L.startswith('ATOM'):
to accord with your requirements statement.

HTH,
John


From Florian.Wollenschein at FernUni-Hagen.de  Sun May 10 11:55:20 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Sun, 10 May 2009 17:55:20 +0200
Subject: Nimrod programming language
In-Reply-To: <mailman.5356.1241924167.11746.python-list@python.org>
References: <mailman.5356.1241924167.11746.python-list@python.org>
Message-ID: <gu6td8$ks7$1@news-cedar.fernuni-hagen.de>

Andreas Rumpf wrote:
> Dear Python-users,
> 
> I invented a new programming language called "Nimrod" that combines Python's readability with C's performance. Please check it out: http://force7.de/nimrod/
> Any feedback is appreciated.
> 
> Regards,
> Andreas Rumpf
> 
> ______________________________________________________
> GRATIS f?r alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!
> Jetzt freischalten unter http://movieflat.web.de
> 

Looks really interesting. I think I'll give it a try later on.
Thanks for your announcement.

Reagrds,
Listick
http://www.listick.org


From gnewsg at gmail.com  Sun May 10 11:55:39 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Sun, 10 May 2009 08:55:39 -0700 (PDT)
Subject: ANN: Python process utility (psutil) 0.1.2 released
References: <65f15b53-aacf-4651-a113-960cce25f205@p4g2000vba.googlegroups.com>
	<slrnh0ah9f.mk1.nick@irishsea.home.craig-wood.com>
Message-ID: <a52e2c7e-4a32-453a-b5c8-cd42cc3efe5e@r36g2000vbr.googlegroups.com>

On 9 Mag, 11:30, Nick Craig-Wood <n... at craig-wood.com> wrote:
> Giampaolo Rodola' <gne... at gmail.com> wrote:
> > ?psutil is a module providing an interface for retrieving information
> > ?on running processes and system utilization (CPU, memory) in a
> > ?portable way by using Python, implementing many functionalities
> > ?offered by tools like ps, top and Windows task manager.
> > ?It currently supports Linux, OS X, FreeBSD and Windows.
>
> Very nice!
>
> Maybe you should make
>
> ? Process()
>
> mean
>
> ? Process(os.getpid())
>
> as I often want ask how much memory/cpu is my process using but rarely
> want to ask about other processes?
>
> It would be nice if "pydoc psutil" returned something useful also!
> You could do this by replacing your current __init__.py (which just
> contains "from _psutil import *") with _psutil.py
>
> --
> Nick Craig-Wood <n... at craig-wood.com> --http://www.craig-wood.com/nick

Thanks for the hints. I'll do that.


--- Giampaolo Rodola'
http://code.google.com/p/pyftpdlib
http://code.google.com/p/psutil/


From steve at REMOVE-THIS-cybersource.com.au  Sun May 10 11:56:00 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 10 May 2009 15:56:00 GMT
Subject: Q's on my first python script
References: <gu6im5$1hi$1@reader1.panix.com>
Message-ID: <0216ec41$0$20647$c3e8da3@news.astraweb.com>

On Sun, 10 May 2009 12:52:21 +0000, kj wrote:

> 1. The name of the BadArgument exception class defined in the script
>    does not seem to me sufficiently specific.  If one were to import the
>    script in order to reuse its wkday_abbrev function, I'd like this
>    exception's name to be more unequivocally tied to this script.  What
>    I'm looking for is something like a "namespace" for this script. 
>    What's the pythonic way to construct a namespace?

You already have one. The module you have created is a namespace. If your 
script is called "myscript.py", then to use it elsewhere you would do:

import myscript
raise myscript.BadArgument


> 2. In some python modules I've seen the idiom
> 
>    if __name__ == "__main__":
>       # run some tests here
> 
>    I'd like to set up tests for this script, mostly to ensure that it
>    handles the error cases properly, but I'm alread using the idiom
>    above to actually run the script under normal operation. What's the
>    typical python idiom for running tests on a *script* (as opposed to a
>    module that is normally not supposed to be run directly)?

I sometimes give my scripts an option -t or --self-test, and then run 
tests if that option is passed on the command line.

Alternatively, put your tests in another module, say, myscript_tests.py, 
and then just run that when you want to test myscript.

 
> 3. Still on the subject of testing, how does one capture in a
>    variable the output that would normally have gone to stdout or
>    stderr?

Normally you would write the function to *return* the result, rather than 
*print* the result. If all output goes through the function return 
mechanism, then it's easy to capture: x = func().

However, for cases where the function does print directly, you can 
redefine stdout and strerr to be any file-like object, so you can do 
something like this:


# untested
import sys
import cStringIO
save_stdout, save_stderr = sys.stdout, sys.stderr
c1 = cStringIO.StringIO()
c2 = cStringIO.StringIO()
try:
    sys.stdout = c1
    sys.stderr = c2
    result = func(*args, **kwargs)  # normally prints some stuff
finally:
    # restore standard files
    sys.stdout = save_stdout
    sys.stderr = save_stderr
captured_from_stdout = c1.getvalue()
captured_from_stderr = c2.getvalue()


 
> 4. What's the python way to emit warnings?  (The script below should
>    warn the user that arguments after the first one are ignored.)

import warnings
warnings.warn("The end of the world is coming!")


> 5. The variable wd is meant to be "global" to the script.  In other
>    languages I've programmed in I've seen some typographic convention
>    used for the name of such variables (e.g. all caps) to signal this
>    widened scope.  Does python have such a convention?

As a general rule, it's best to avoid globals variables as much as 
possible.

One convention I occasionally use is to prefix global variables with a 
lowercase g. And then ruthlessly refactor my code until any variable 
starting with a lowercase g is removed :)




-- 
Steven


From sjmachin at lexicon.net  Sun May 10 11:59:53 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 10 May 2009 08:59:53 -0700 (PDT)
Subject: strip part of string
References: <b87c422a0905100818w1bc2db1fpf640ca987482ba79@mail.gmail.com> 
	<mailman.5378.1241969686.11746.python-list@python.org>
Message-ID: <d4450796-5fbf-4eb2-b1ec-f37f7ba6842b@y6g2000prf.googlegroups.com>

On May 11, 1:34?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> Francesco Pietra wrote:
> > Hi:
> > I would like to delete everything from column 54 on for each line
> > beginning with "ATOM". In the example in the attachment (sorry for the
> > attachment; I found no way with Google mail to have plain text mail)
> > the new line would become:
>
> > ATOM ? ? 49 ?NH1 ARG ? ?84 ? ? ?84.628 ?41.570 ?44.395
>
> > without any blank space to the right. . Everything else should remain
> > at its original column. I have been looking for ???? statement, unable
> > (my big fault ) to find a right one. I tried with slices % but it
> > becomes unnecessarily complex.
>
> data = open('rec.crg', 'r')
> outp = open('rec.strip.crg', 'w')
>
> for L in data:
> ? ? if L[3] == 'M':
> ? ? ? L = L[:55].rstrip() + '\n'
> ? ? outp.write(L)
>
> data.close()
> outp.close()
>
> Note that .rstrip() will strip all whitespace from the right-hand end of
> the string, including the '\n' at the end of the string/line, so a new
> '\n' has to be added.

His line-terminal '\n' has already disappeared before the rstrip gets
a guernsey.
His "column 54" is counting from 0, not from 1 -- his [:55] is getting
him an extra space which he doesn't want.


From anuraguniyal at yahoo.com  Sun May 10 12:04:03 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Sun, 10 May 2009 09:04:03 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl> 
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com> 
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl> 
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
	<slrnh0d0gd.mi5.nick@irishsea.home.craig-wood.com>
	<05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>
	<76nmsuF1djnc0U1@mid.uni-berlin.de>
Message-ID: <3334d202-a5ad-4819-aab6-cb736845b955@y6g2000prf.googlegroups.com>

yes but my list sometimes have list of lists

On May 10, 2:59?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> anuraguni... at yahoo.com schrieb:
>
> > ok that explains it,
> > so
> > unicode(obj) calls __unicode__ on that object and if it isn't there
> > __repr__ is used
> > __repr__ of list by default return a str even if __repr__ of element
> > is unicode
>
> > so my only solution looks like to use my own list class everywhere i
> > use list
> > class mylist(list):
> > ? ? def __unicode__(self):
> > ? ? ? ? return u"["+u''.join(map(unicode,self))+u"]"
>
> Or you use a custom unicode_list-function whenever you care to print out
> ? a list.
>
> Diez



From rustompmody at gmail.com  Sun May 10 12:10:11 2009
From: rustompmody at gmail.com (Rustom Mody)
Date: Sun, 10 May 2009 21:40:11 +0530
Subject: help with recursive whitespace filter in
Message-ID: <f46c52560905100910i616f291k29e756afcf7574f0@mail.gmail.com>

I am trying to write a recursive filter to remove whitespace-only
nodes for minidom.
The code is below.

Strangely it deletes some whitespace nodes and leaves some.
If I keep calling it -- like so: fws(fws(fws(doc)))  then at some
stage all the ws nodes disappear

Does anybody have a clue?


from xml.dom.minidom import parse

#The input to fws is the output of parse("something.xml")


def fws(ele):
    """ filter white space (recursive)"""

   for c in ele.childNodes:
        if isWsNode(c):
            ele.removeChild(c)
            #c.unlink() Makes no diff whether this is there or not
        elif c.nodeType == ele.ELEMENT_NODE:
            fws(c)


def isWsNode(ele):
    return (ele.nodeType == ele.TEXT_NODE and not ele.data.strip())


From brian at sweetapp.com  Sun May 10 12:23:16 2009
From: brian at sweetapp.com (Brian Quinlan)
Date: Sun, 10 May 2009 17:23:16 +0100
Subject: Java-style futures in Python - only better
In-Reply-To: <4A06FA0B.1060000@ncf.ca>
References: <mailman.5372.1241957806.11746.python-list@python.org>
	<4A06FA0B.1060000@ncf.ca>
Message-ID: <4A06FF74.7060405@sweetapp.com>

Colin J. Williams wrote:
> Brian,
> 
> Since the word "future" is part of the Python lingo:
> 
> A future statement is a directive to the compiler that a particular 
> module should be compiled using syntax or semantics that will be 
> available in a specified future release of Python. The future statement 
> is intended to ease migration to future versions of Python that 
> introduce incompatible changes to the language. It allows use of the new 
> features on a per-module basis before the release in which the feature 
> becomes standard.
> 
> Have you given thought to the use of another word?

I named the module "futures" (plural) to try to reduce the potential 
confusion with the "__futures__" module.

The concept of a future is fairly well known in CS 
[http://en.wikipedia.org/wiki/Future_(programming)] so giving it a 
completely different name would be a bit annoying.

Cheers,
Brian

> Colin W.
> 
> Brian Quinlan wrote:
>> Hey all,
>>
>> I've been working on an Java-style futures implementation in Python. 
>> Futures are a way of representing asynchronous operations e.g. 
>> operations that are run in another thread or process. The are are a 
>> easy but powerful way of parallelizing sequential operations. The also 
>> provide a consistent interface across implementations e.g. they can 
>> provide the same interface to threading and to multiprocessing.
>>
>> For example:
>>
>> def is_prime(n):
>>     "Return True iff n is prime"
>>     ...
>>
>> def check_primes(numbers):
>>     return map(is_prime, numbers)
>>
>> Could be parallelized as:
>>
>> def check_primes(numbers):
>>     # ProcessPoolExecutor will create one worker process
>>     # per CPU if called without arguments. Using threads
>>     # is valueless because of the GIL.
>>     with futures.ProcessPoolExecutor() as executor:
>>         return executor.map(is_prime, numbers)
>>
>> A more complex example:
>>
>> def load_url(url, timeout):
>>     return urllib.request.urlopen(url, timeout=timeout).read()
>>
>> ### Download the content of some URLs - ignore failures.
>> def download_urls(urls, timeout=60):
>>     url_to_content = {}
>>     for url in urls:
>>         try:
>>             url_to_content[url] = load_url(url, timeout=timeout)
>>         except:
>>             pass
>>     return url_to_content
>>
>> Could be parallelized as:
>>
>> # Making this a global variable used any many functions ensures that
>> # the global thread count is kept under control.
>> executor = futures.ThreadPoolExecutor(50)
>> def download_urls(urls, timeout=60):
>>     url_to_content = {}
>>     # Run load_url for every url and get the result as a FuturesList.
>>     fs = executor.run_to_futures(
>>             (functools.partial(load_url, url, timeout) for url in urls),
>>             timeout=timeout)
>>     for url, future in zip(urls, fs.successful_futures()):
>>         url_to_content[url] = future.result()
>>     return url_to_content
>>
>>
>> The Python 3.0+ code is here:
>> http://code.google.com/p/pythonfutures/source
>>
>> Any feedback on the API would be very much appreciated!
>>
>> Cheers,
>> Brian
>>
>>



From showell30 at yahoo.com  Sun May 10 12:49:46 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 10 May 2009 09:49:46 -0700 (PDT)
Subject: help with recursive whitespace filter in
References: <mailman.5380.1241971815.11746.python-list@python.org>
Message-ID: <53fc8859-5254-4f49-94f3-c6c430d77371@z5g2000vba.googlegroups.com>

On May 10, 9:10?am, Rustom Mody <rustompm... at gmail.com> wrote:
> I am trying to write a recursive filter to remove whitespace-only
> nodes for minidom.
> The code is below.
>
> Strangely it deletes some whitespace nodes and leaves some.
> If I keep calling it -- like so: fws(fws(fws(doc))) ?then at some
> stage all the ws nodes disappear
>
> Does anybody have a clue?
>
> from xml.dom.minidom import parse
>
> #The input to fws is the output of parse("something.xml")
>
> def fws(ele):
> ? ? """ filter white space (recursive)"""
>
> ? ?for c in ele.childNodes:
> ? ? ? ? if isWsNode(c):
> ? ? ? ? ? ? ele.removeChild(c)
> ? ? ? ? ? ? #c.unlink() Makes no diff whether this is there or not
> ? ? ? ? elif c.nodeType == ele.ELEMENT_NODE:
> ? ? ? ? ? ? fws(c)
>
> def isWsNode(ele):
> ? ? return (ele.nodeType == ele.TEXT_NODE and not ele.data.strip())

I would avoid doing things like delete/remove in a loop.  Instead
build a list of things to delete.


From andreengels at gmail.com  Sun May 10 12:56:52 2009
From: andreengels at gmail.com (Andre Engels)
Date: Sun, 10 May 2009 18:56:52 +0200
Subject: Q's on my first python script
In-Reply-To: <0216ec41$0$20647$c3e8da3@news.astraweb.com>
References: <gu6im5$1hi$1@reader1.panix.com>
	<0216ec41$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <6faf39c90905100956ya8666c6rc9236837db0edf0d@mail.gmail.com>

On Sun, May 10, 2009 at 5:56 PM, Steven D'Aprano
<steve at remove-this-cybersource.com.au> wrote:

>> 5. The variable wd is meant to be "global" to the script. ?In other
>> ? ?languages I've programmed in I've seen some typographic convention
>> ? ?used for the name of such variables (e.g. all caps) to signal this
>> ? ?widened scope. ?Does python have such a convention?
>
> As a general rule, it's best to avoid globals variables as much as
> possible.

However, this is not really a global variable, this is a constant,
which is not something to be avoided, nor something that there is a
convention for (as far as I know).


-- 
Andr? Engels, andreengels at gmail.com


From allenreas at gmail.com  Sun May 10 13:04:04 2009
From: allenreas at gmail.com (AllenLars)
Date: Sun, 10 May 2009 10:04:04 -0700 (PDT)
Subject: Downloading most recently modified files
In-Reply-To: <2dc0c81b0905071336l365f6b3aq51761873b52e38d0@mail.gmail.com>
References: <23432457.post@talk.nabble.com>
	<2dc0c81b0905071336l365f6b3aq51761873b52e38d0@mail.gmail.com>
Message-ID: <23471969.post@talk.nabble.com>


Thanks Shawn.  I went through the ftplib info and I was able to generate a
list.  I am needing to figure out parsing the list. 

AllenLars

Shawn Milochik wrote:
> 
> On Thu, May 7, 2009 at 2:19 PM, AllenLars <allenreas at gmail.com> wrote:
>>
>> I am trying to code a script that will allow me to go to ftp site and
>> download files based on most recently modified file (date, time). ?I am
>> brand new to programming. ?Any and all help is appreciated.
>> --<snip>
> 
> 
> I've actually written code to do this, and it's fairly easy. Just use
> the FTP module to run the "ls" (directory listing) command and parse
> the results to get the filenames and timestamps. Then you will be able
> to easily do download requests for the file(s) you want.
> 
> Perhaps someone else on the list can chime in with a more elegant
> solution.
> 
> Here's enough to get you started:
> 
> from ftplib import FTP   #(http://docs.python.org/library/ftplib.html)
> 
> ShawnMilo
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
> 

-- 
View this message in context: http://www.nabble.com/Downloading-most-recently-modified-files-tp23432457p23471969.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From Scott.Daniels at Acm.Org  Sun May 10 13:06:04 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 10 May 2009 10:06:04 -0700
Subject: import overwrites __name__
In-Reply-To: <m2skjddmdh.fsf@cs.uu.nl>
References: <gu1pad$afi$1@ger.gmane.org>
	<mailman.5361.1241924171.11746.python-list@python.org>
	<gu600c$pvt$00$1@news.t-online.com> <m2skjddmdh.fsf@cs.uu.nl>
Message-ID: <pqedne2OjKvYlZrXnZ2dnUVZ_omdnZ2d@pdx.net>

Piet van Oostrum wrote:
>>>>>> Peter Otten <__peter__ at web.de> (PO) wrote:
> 
>> PO> $ cat x.py
>> PO> import sys
>> PO> globals().update(zip(*(range(110),)*2))
>> PO> y = 42
>> PO> print __name__
>> PO> if __name__ == "__main__":
>> PO>     a = b = 42
>> PO> print len(dir())
>> PO> from x import y as z
>> PO> try:
>> PO>     print my_name
>> PO> except NameError, e:
>> PO>     print 'unhandled NameError: "%s"' % e
>> PO>     sys.exit()
> 
>> PO> $ python x.py
>> PO> __main__
>> PO> 119
>> PO> x
>> PO> 117
>> PO> unhandled NameError: "name 'my_name' is not defined"
> 
> This is perfectly normal. python x.py command runs normally (although
> the globals().update is a very weird thing to do), until the from x
> import y command. Then x.py is loaded again but now as the module 'x'
> instead of '__main__'. Python doesn't know it's the same file, and
> actually it doesn't want to know. It only knows it when you do import
> twice on the same file. Not when you run it as a main script first and
> then imports it. **This is a thing you shouldn't do**.
> There are now two namespaces: one for __main__ and one for x. These are
> distinct and have no relationship. 
> 
> The reason that the first number is 119 and the second is 117 is that
> while importing x the variables a and b are not created.
After a bit more boiling down:

x.py:

import sys
y = 42
if __name__ == "__main__":
     a = b = 42
print __name__, 'size', len(dir())
from x import y as z
print __name__, 'size', len(dir()), 'completed import of', z
try:
     print my_name
except NameError, e:
     print '%s found unhandled NameError: "%s"' % (__name__, e)
     sys.exit()

produces:
__main__
__main__ size 8
x
x size 6
x size 7 completed import of 42
x found unhandled NameError: "name 'my_name' is not defined"

--Scott David Daniels
Scott.Daniels at Acm.Org


From rtomek at ceti.com.pl  Sun May 10 13:08:47 2009
From: rtomek at ceti.com.pl (Tomasz Rola)
Date: Sun, 10 May 2009 19:08:47 +0200 (CEST)
Subject: Nimrod programming language
In-Reply-To: <159308160@web.de>
References: <159308160@web.de>
Message-ID: <Pine.LNX.4.64.0905101836020.7447@tau.ceti.pl>

On Fri, 8 May 2009, Andreas Rumpf wrote:

> Dear Python-users,
> 
> I invented a new programming language called "Nimrod" that combines 
> Python's readability with C's performance. Please check it out: 
> http://force7.de/nimrod/ 
> Any feedback is appreciated.
> 
> Regards,
> Andreas Rumpf

Interesting.

One question I ask myself upon seeing a new language is if it is possible 
to program amb (amb=ambiguous) operator in it. This page gives a very 
nice, "code first" explanation of amb and how it is supposed to work:

http://www.randomhacks.net/articles/2005/10/11/amb-operator

I am not sure if this kind of extension is doable in your Nimrod. Perhaps 
it can be somewhat extrapolated from docs, but at the moment I have no 
time to do this (and could not google anything interesting).

As can be seen on the page mentioned, in Ruby this seems to be quite light 
and effortless. From what I know about Python, it is either hard or 
impractical (to the point of being impossible) to write amb in it.

Two additional notes regarding amb:

1. Even if Nimrod cannot support amb in an elegant way, it is still nice 
idea. Especially if you can make it to be kind of Python superset, so that 
Python programmer can cross the boundary between the two without much 
hassle (and maybe in both directions). Of course, not everything can be 
copied.

2. The amb itself is not really important so much, and I may never feel 
any need to actually use it. But it stroke me how nice it was looking in 
Ruby, even if I finally decided not to learn Ruby (not in this year, at 
least).

In Scheme, it is a bit more hackish, but still looks nice, at least to me:

http://www.ccs.neu.edu/home/dorai/t-y-scheme/t-y-scheme-Z-H-16.html#node_chap_14
http://planet.plt-scheme.org/package-source/murphy/amb.plt/1/0/planet-docs/amb/index.html

Anyway, I think amb is quite a test of a language. If you can do it, 
please show the code.

Regards,
Tomasz Rola

--
** A C programmer asked whether computer had Buddha's nature.      **
** As the answer, master did "rm -rif" on the programmer's home    **
** directory. And then the C programmer became enlightened...      **
**                                                                 **
** Tomasz Rola          mailto:tomasz_rola at bigfoot.com             **


From Scott.Daniels at Acm.Org  Sun May 10 13:09:29 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 10 May 2009 10:09:29 -0700
Subject: Wrapping comments
In-Reply-To: <0216b85e$0$20647$c3e8da3@news.astraweb.com>
References: <towb-EA7906.14423909052009@news.individual.de>	<gu55va$uba$2@lust.ihug.co.nz>
	<vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d@pdx.net>	<gu5bbr$1ua$1@lust.ihug.co.nz>
	<0216b85e$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <pqedneyOjKuPlJrXnZ2dnUVZ_omdnZ2d@pdx.net>

Steven D'Aprano wrote:
> On Sun, 10 May 2009 13:41:15 +1200, Lawrence D'Oliveiro wrote:
>> If I had to print out all the code and documentation I have to look at,
>> I'd need to add another room to my house.
> 
> You are allowed to throw it away when you're done with it :)

Except here in Portland, where you'd better recycle it. ;)

--Scott David Daniels
Scott.Daniels at Acm.Org


From drobinow at gmail.com  Sun May 10 13:16:52 2009
From: drobinow at gmail.com (David Robinow)
Date: Sun, 10 May 2009 13:16:52 -0400
Subject: Wrapping comments
In-Reply-To: <towb-63CE3D.09322210052009@news.individual.de>
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
Message-ID: <4eb0089f0905101016x13dc34fp2eb0ec2b241f1c80@mail.gmail.com>

On Sun, May 10, 2009 at 3:32 AM, Tobias Weber <towb at gmx.net> wrote:
> In article <m2bpq2ngup.fsf at googlemail.com>,
> ?Arnaud Delobelle <arnodel at googlemail.com> wrote:
>
>> A simple Alt-Q will reformat everything nicely.
>
> Now that's something. Thanks!
>
> (still not gonna use software that doesn't let me type # because it's
> alt+3 on a UK layout; having to re-learn or configure that is just sick)
>
 Put the following in your .emacs file:

(define-key key-translation-map [?\M-3] "#")


or, if you prefer, just be sick.


From martin at v.loewis.de  Sun May 10 13:18:16 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 10 May 2009 19:18:16 +0200
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
References: <49D4DA72.60401@v.loewis.de>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB22B5.3040507@simplistix.co.uk>	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>	<4A0590C4.1020904@v.loewis.de>	<20090509143829.17F293A4080@sparrow.telecommunity.com>	<4A059639.7040505@v.loewis.de>	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
Message-ID: <4A070C58.4070003@v.loewis.de>

> GNU stow does handle these issues.

If GNU stow solves all your problems, why do you want to
use easy_install in the first place?

Regards,
Martin


From rustompmody at gmail.com  Sun May 10 13:23:29 2009
From: rustompmody at gmail.com (rustom)
Date: Sun, 10 May 2009 10:23:29 -0700 (PDT)
Subject: help with recursive whitespace filter in
References: <mailman.5380.1241971815.11746.python-list@python.org> 
	<53fc8859-5254-4f49-94f3-c6c430d77371@z5g2000vba.googlegroups.com>
Message-ID: <0291fad2-a744-4ced-bcd4-fb8529e968b8@x29g2000prf.googlegroups.com>

On May 10, 9:49?pm, Steve Howell <showel... at yahoo.com> wrote:
> On May 10, 9:10?am, Rustom Mody <rustompm... at gmail.com> wrote:
>
>
>
> > I am trying to write a recursive filter to remove whitespace-only
> > nodes for minidom.
> > The code is below.
>
> > Strangely it deletes some whitespace nodes and leaves some.
> > If I keep calling it -- like so: fws(fws(fws(doc))) ?then at some
> > stage all the ws nodes disappear
>
> > Does anybody have a clue?
>
> > from xml.dom.minidom import parse
>
> > #The input to fws is the output of parse("something.xml")
>
> > def fws(ele):
> > ? ? """ filter white space (recursive)"""
>
> > ? ?for c in ele.childNodes:
> > ? ? ? ? if isWsNode(c):
> > ? ? ? ? ? ? ele.removeChild(c)
> > ? ? ? ? ? ? #c.unlink() Makes no diff whether this is there or not
> > ? ? ? ? elif c.nodeType == ele.ELEMENT_NODE:
> > ? ? ? ? ? ? fws(c)
>
> > def isWsNode(ele):
> > ? ? return (ele.nodeType == ele.TEXT_NODE and not ele.data.strip())
>
> I would avoid doing things like delete/remove in a loop. ?Instead
> build a list of things to delete.

Yeah I know. I would write the whole damn thing functionally if I knew
how.  But cant figure out the API.
I actually started out to write a (haskell-style) copy out the whole
tree minus the unwanted nodes but could not figure it out


From Scott.Daniels at Acm.Org  Sun May 10 13:31:54 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 10 May 2009 10:31:54 -0700
Subject: Q's on my first python script
In-Reply-To: <0216ec41$0$20647$c3e8da3@news.astraweb.com>
References: <gu6im5$1hi$1@reader1.panix.com>
	<0216ec41$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <U6qdnWYosYnOk5rXnZ2dnUVZ_j6dnZ2d@pdx.net>

Steven D'Aprano wrote:
> On Sun, 10 May 2009 12:52:21 +0000, kj wrote:
> ....
>> 5. The variable wd is meant to be "global" to the script.  In other
>>    languages I've programmed in I've seen some typographic convention
>>    used for the name of such variables (e.g. all caps) to signal this
>>    widened scope.  Does python have such a convention?
> 
> As a general rule, it's best to avoid globals variables as much as 
> possible.
> 
> One convention I occasionally use is to prefix global variables with a 
> lowercase g. And then ruthlessly refactor my code until any variable 
> starting with a lowercase g is removed :)

You (the OP) don't seem to know about PEP 8, which advises 4-space
indents, all-caps constants, and many more style specifics.
     http://www.python.org/dev/peps/pep-0008/

--Scott David Daniels
Scott.Daniels at Acm.Org


From google at mrabarnett.plus.com  Sun May 10 13:35:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 10 May 2009 18:35:59 +0100
Subject: help with recursive whitespace filter in
In-Reply-To: <0291fad2-a744-4ced-bcd4-fb8529e968b8@x29g2000prf.googlegroups.com>
References: <mailman.5380.1241971815.11746.python-list@python.org>
	<53fc8859-5254-4f49-94f3-c6c430d77371@z5g2000vba.googlegroups.com>
	<0291fad2-a744-4ced-bcd4-fb8529e968b8@x29g2000prf.googlegroups.com>
Message-ID: <4A07107F.5000703@mrabarnett.plus.com>

rustom wrote:
> On May 10, 9:49 pm, Steve Howell <showel... at yahoo.com> wrote:
>> On May 10, 9:10 am, Rustom Mody <rustompm... at gmail.com> wrote:
>>
>>
>>
>>> I am trying to write a recursive filter to remove whitespace-only
>>> nodes for minidom.
>>> The code is below.
>>> Strangely it deletes some whitespace nodes and leaves some.
>>> If I keep calling it -- like so: fws(fws(fws(doc)))  then at some
>>> stage all the ws nodes disappear
>>> Does anybody have a clue?
>>> from xml.dom.minidom import parse
>>> #The input to fws is the output of parse("something.xml")
>>> def fws(ele):
>>>     """ filter white space (recursive)"""
>>>    for c in ele.childNodes:
>>>         if isWsNode(c):
>>>             ele.removeChild(c)
>>>             #c.unlink() Makes no diff whether this is there or not
>>>         elif c.nodeType == ele.ELEMENT_NODE:
>>>             fws(c)
>>> def isWsNode(ele):
>>>     return (ele.nodeType == ele.TEXT_NODE and not ele.data.strip())
>> I would avoid doing things like delete/remove in a loop.  Instead
>> build a list of things to delete.
> 
> Yeah I know. I would write the whole damn thing functionally if I knew
> how.  But cant figure out the API.
> I actually started out to write a (haskell-style) copy out the whole
> tree minus the unwanted nodes but could not figure it out
> 
def fws(ele):
     """ filter white space (recursive)"""
     empty_nodes = []
     for c in ele.childNodes:
         if isWsNode(c):
             empty_nodes.append(c)
         elif c.nodeType == ele.ELEMENT_NODE:
             fws(c)
     for c in empty_nodes:
         ele.removeChild(c)


From google at mrabarnett.plus.com  Sun May 10 13:37:56 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 10 May 2009 18:37:56 +0100
Subject: Q's on my first python script
In-Reply-To: <6faf39c90905100956ya8666c6rc9236837db0edf0d@mail.gmail.com>
References: <gu6im5$1hi$1@reader1.panix.com>	<0216ec41$0$20647$c3e8da3@news.astraweb.com>
	<6faf39c90905100956ya8666c6rc9236837db0edf0d@mail.gmail.com>
Message-ID: <4A0710F4.1070807@mrabarnett.plus.com>

Andre Engels wrote:
> On Sun, May 10, 2009 at 5:56 PM, Steven D'Aprano
> <steve at remove-this-cybersource.com.au> wrote:
> 
>>> 5. The variable wd is meant to be "global" to the script.  In other
>>>    languages I've programmed in I've seen some typographic convention
>>>    used for the name of such variables (e.g. all caps) to signal this
>>>    widened scope.  Does python have such a convention?
>> As a general rule, it's best to avoid globals variables as much as
>> possible.
> 
> However, this is not really a global variable, this is a constant,
> which is not something to be avoided, nor something that there is a
> convention for (as far as I know).
> 
In Python the convention for constants is CAPS_WITH_UNDERSCORES.


From Scott.Daniels at Acm.Org  Sun May 10 13:53:02 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 10 May 2009 10:53:02 -0700
Subject: help with recursive whitespace filter in
In-Reply-To: <mailman.5380.1241971815.11746.python-list@python.org>
References: <mailman.5380.1241971815.11746.python-list@python.org>
Message-ID: <k8idnYXf3ILbjprXnZ2dnUVZ_qqdnZ2d@pdx.net>

Rustom Mody wrote:
> I am trying to write a recursive filter to remove whitespace-only
> nodes for minidom.
> The code is below.
> 
> Strangely it deletes some whitespace nodes and leaves some.
> If I keep calling it -- like so: fws(fws(fws(doc)))  then at some
> stage all the ws nodes disappear
> 
> Does anybody have a clue?

Yup, don't stand on the limb you are sawing off.

> def fws(ele):
...
>    for c in ele.childNodes:
>         if isWsNode(c):
>             ele.removeChild(c)
...
At the very least:
      for c in reversed(ele.childNodes):
           if isWsNode(c):
               ele.removeChild(c)

--Scott David Daniels
Scott.Daniels at Acm.Org


From __peter__ at web.de  Sun May 10 13:59:18 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 10 May 2009 19:59:18 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org>
	<mailman.5361.1241924171.11746.python-list@python.org>
	<gu600c$pvt$00$1@news.t-online.com> <m2skjddmdh.fsf@cs.uu.nl>
Message-ID: <gu74ld$cii$02$1@news.t-online.com>

Piet van Oostrum wrote:

>>>>>> Peter Otten <__peter__ at web.de> (PO) wrote:
> 
>>PO> $ cat x.py
>>PO> import sys
>>PO> globals().update(zip(*(range(110),)*2))
>>PO> y = 42
>>PO> print __name__
>>PO> if __name__ == "__main__":
>>PO>     a = b = 42
>>PO> print len(dir())
>>PO> from x import y as z
>>PO> try:
>>PO>     print my_name
>>PO> except NameError, e:
>>PO>     print 'unhandled NameError: "%s"' % e
>>PO>     sys.exit()
> 
>>PO> $ python x.py
>>PO> __main__
>>PO> 119
>>PO> x
>>PO> 117
>>PO> unhandled NameError: "name 'my_name' is not defined"
> 
> This is perfectly normal. 

I'm not 100% sure of that.

Just in case you didn't notice: I'm not the OP. The above piece of junk code 
was my attempt to keep as close to the code he posted while producing the 
same output that he got.

> python x.py command runs normally (although
> the globals().update is a very weird thing to do), until the from x
> import y command. Then x.py is loaded again but now as the module 'x'
> instead of '__main__'. Python doesn't know it's the same file, and
> actually it doesn't want to know. It only knows it when you do import
> twice on the same file. Not when you run it as a main script first and
> then imports it. **This is a thing you shouldn't do**.
> There are now two namespaces: one for __main__ and one for x. These are
> distinct and have no relationship.
> 
> The reason that the first number is 119 and the second is 117 is that
> while importing x the variables a and b are not created.

Your explanation is of course between 119 and 117% correct while I was only 
99% serious...

Cheers,
Peter



From zooko at zooko.com  Sun May 10 14:04:57 2009
From: zooko at zooko.com (Zooko Wilcox-O'Hearn)
Date: Sun, 10 May 2009 12:04:57 -0600
Subject: how GNU stow is complementary rather than alternative to distutils
In-Reply-To: <4A070C58.4070003@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB22B5.3040507@simplistix.co.uk>	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>	<4A0590C4.1020904@v.loewis.de>	<20090509143829.17F293A4080@sparrow.telecommunity.com>	<4A059639.7040505@v.loewis.de>	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
	<4A070C58.4070003@v.loewis.de>
Message-ID: <B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>

On May 10, 2009, at 11:18 AM, Martin v. L?wis wrote:

> If GNU stow solves all your problems, why do you want to use  
> easy_install in the first place?

That's a good question.  The answer is that there are two separate  
jobs: building executables and putting them in a directory structure  
of the appropriate shape for your system is one job, and installing  
or uninstalling that tree into your system is another.  GNU stow does  
only the latter.

The input to GNU stow is a set of executables, library files, etc.,  
in a directory tree that is of the right shape for your system.  For  
example, if you are on a Linux system, then your scripts all need to  
be in $prefix/bin/, your shared libs should be in $prefix/lib, your  
Python packages ought to be in $prefix/lib/python$x.$y/site- 
packages/, etc.  GNU stow is blissfully ignorant about all issues of  
building binaries, and choosing where to place files, etc. -- that's  
the job of the build system of the package, e.g. the "./configure -- 
prefix=foo && make && make install" for most C packages, or the  
"python ./setup.py install --prefix=foo" for Python packages using  
distutils (footnote 1).

Once GNU stow has the well-shaped directory which is the output of  
the build process, then it follows a very dumb, completely reversible  
(uninstallable) process of symlinking those files into the system  
directory structure.

It is a beautiful, elegant hack because it is sooo dumb.  It is also  
very nice to use the same tool to manage packages written in any  
programming language, provided only that they can build a directory  
tree of the right shape and content.

However, there are lots of things that it doesn't do, such as  
automatically acquiring and building dependencies, or producing  
executables for the target platform for each of your console  
scripts.  Not to mention creating a directory named "$prefx/lib/python 
$x.$y/site-packages" and cp'ing your Python files into it.  That's  
why you still need a build system even if you use GNU stow for an  
install-and-uninstall system.

The thing that prevents this from working with setuptools is that  
setuptools creates a file named easy_install.pth during the "python ./ 
setup.py install --prefix=foo" if you build two different Python  
packages this way, they will each create an easy_install.pth file,  
and then when you ask GNU stow to link the two resulting packages  
into your system, it will say "You are asking me to install two  
different packages which both claim that they need to write a file  
named '/usr/local/lib/python2.5/site-packages/easy_install.pth'.  I'm  
too dumb to deal with this conflict, so I give up.".  If I understand  
correctly, your (MvL's) suggestion that easy_install create a .pth  
file named "easy_install-$PACKAGE-$VERSION.pth" instead of  
"easy_install.pth" would indeed make it work with GNU stow.

Regards,

Zooko

footnote 1: Aside from the .pth file issue, the other reason that  
setuptools doesn't work for this use while distutils does is that  
setuptools tries to hard to save you from making a mistake: maybe you  
don't know what you are doing if you ask it to install into a  
previously non-existent prefix dir "foo".  This one is easier to fix:  
http://bugs.python.org/setuptools/issue54 # "be more like distutils  
with regard to --prefix=" .

From kay at fiber-space.de  Sun May 10 14:05:49 2009
From: kay at fiber-space.de (kay at fiber-space.de)
Date: Sun, 10 May 2009 11:05:49 -0700 (PDT)
Subject: php to python code converter
References: <mailman.5292.1241795959.11746.python-list@python.org>
Message-ID: <1ca12653-4c28-48f1-bf17-def74a89ef15@h23g2000vbc.googlegroups.com>

On 8 Mai, 17:19, Pascal Chambon <chambon.pas... at gmail.com> wrote:
> Hello
>
> That's funny, I was precisely thinking about a php to python converter,
> some weeks ago.
> Such a tool, allowing for example to convert some CMS like Drupal to
> python, would be a killer app, when we consider the amount of php code
> available.
>
> But of course, there are lots of issues that'd have to be fixed :
> - translating the php syntax to python syntax
> - forcing scope limitations where php doesn't have any
> - handling differences in semantics (for example, the booleanness of "0"
> or)
> - handling the automatic variable creation and coertion that php features
> - handling the php types like arrays (which are neither python lists nor
> python dicts)
> - providing a whole mirror of the php stdlib (string and file functions,
> access to environment vars...)

Some thoughts.

1) Syntax. Not a big deal.

2) Semantics. My favourite approach was to create a Python framework
that represents PHP in Python and enables round-trips. So one could
translate forth and back. Python code that is compliant to the
conventions of the framework can also be translated to PHP and for
each PHP program P following equation holds:

   py2php(php2py(P)) = P

This makes readable code mandatory.

3) PHP stdlib via C bindings ( ctypes? )

4) Corner cases of bindings: cut them off. Not everything has to be
translated. But produce stubs that raise NotImplementedError
exceptions.

Same arguments apply to Javascript. Not sure about Ruby but I do think
a parser is feasible despite context sensitivities. Ruby is not my
concern though.

Personally I'd be interested in Wordpress which I like and use.

Kay


From davea at ieee.org  Sun May 10 14:21:03 2009
From: davea at ieee.org (Dave Angel)
Date: Sun, 10 May 2009 14:21:03 -0400
Subject: import overwrites __name__
In-Reply-To: <pqedne2OjKvYlZrXnZ2dnUVZ_omdnZ2d@pdx.net>
References: <gu1pad$afi$1@ger.gmane.org>	<mailman.5361.1241924171.11746.python-list@python.org>	<gu600c$pvt$00$1@news.t-online.com>
	<m2skjddmdh.fsf@cs.uu.nl>
	<pqedne2OjKvYlZrXnZ2dnUVZ_omdnZ2d@pdx.net>
Message-ID: <4A071B0F.2020206@ieee.org>

Scott David Daniels wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">Piet van 
> Oostrum wrote:
>>>>>>> Peter Otten <__peter__ at web.de> (PO) wrote:
>>
>>> PO> $ cat x.py
>>> PO> import sys
>>> PO> globals().update(zip(*(range(110),)*2))
>>> PO> y = 42
>>> PO> print __name__
>>> PO> if __name__ == "__main__":
>>> PO>     a = b = 42
>>> PO> print len(dir())
>>> PO> from x import y as z
>>> PO> try:
>>> PO>     print my_name
>>> PO> except NameError, e:
>>> PO>     print 'unhandled NameError: "%s"' % e
>>> PO>     sys.exit()
>>
>>> PO> $ python x.py
>>> PO> __main__
>>> PO> 119
>>> PO> x
>>> PO> 117
>>> PO> unhandled NameError: "name 'my_name' is not defined"
>>
>> This is perfectly normal. python x.py command runs normally (although
>> the globals().update is a very weird thing to do), until the from x
>> import y command. Then x.py is loaded again but now as the module 'x'
>> instead of '__main__'. Python doesn't know it's the same file, and
>> actually it doesn't want to know. It only knows it when you do import
>> twice on the same file. Not when you run it as a main script first and
>> then imports it. **This is a thing you shouldn't do**.
>> There are now two namespaces: one for __main__ and one for x. These are
>> distinct and have no relationship.
>> The reason that the first number is 119 and the second is 117 is that
>> while importing x the variables a and b are not created.
> After a bit more boiling down:
>
> x.py:
>
> import sys
> y = 42
> if __name__ == "__main__":
>     a = b = 42
> print __name__, 'size', len(dir())
> from x import y as z
> print __name__, 'size', len(dir()), 'completed import of', z
> try:
>     print my_name
> except NameError, e:
>     print '%s found unhandled NameError: "%s"' % (__name__, e)
>     sys.exit()
>
> produces:
> __main__
> __main__ size 8
> x
> x size 6
> x size 7 completed import of 42
> x found unhandled NameError: "name 'my_name' is not defined"
>
> --Scott David Daniels
> Scott.Daniels at Acm.Org
>
> </div>
>
I already said this before - don't ever import the file you're using as 
a script.  Now that we have real names for these files, I can say it 
more strongly.

If you use "import x"    or its variant "from x import..."   then *DO 
NOT* run x.py as your main script.

You must have a separate script file that you run, and that nobody tries 
to import.

Now, once you get past that problem, you'll probably have others.  Why 
on earth would you try to import a module from itself? The line:
   from x import y as z

is probably equivalent to  z=y




From martin at v.loewis.de  Sun May 10 14:21:48 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 10 May 2009 20:21:48 +0200
Subject: how GNU stow is complementary rather than alternative to distutils
In-Reply-To: <B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
References: <49D4DA72.60401@v.loewis.de>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB22B5.3040507@simplistix.co.uk>	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>	<4A0590C4.1020904@v.loewis.de>	<20090509143829.17F293A4080@sparrow.telecommunity.com>	<4A059639.7040505@v.loewis.de>	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
	<4A070C58.4070003@v.loewis.de>
	<B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
Message-ID: <4A071B3C.2060808@v.loewis.de>

Zooko Wilcox-O'Hearn wrote:
> On May 10, 2009, at 11:18 AM, Martin v. L?wis wrote:
> 
>> If GNU stow solves all your problems, why do you want to use
>> easy_install in the first place?
> 
> That's a good question.  The answer is that there are two separate jobs:
> building executables and putting them in a directory structure of the
> appropriate shape for your system is one job, and installing or
> uninstalling that tree into your system is another.  GNU stow does only
> the latter.

And so does easy_install - it's job is *not* to build the executables
and to put them in a directory structure. Instead, it's
distutils/setuptools which has this job.

The primary purpose of easy_install is to download the files from PyPI
(IIUC).

> The thing that prevents this from working with setuptools is that
> setuptools creates a file named easy_install.pth

It will stop doing that if you ask nicely. That's why I recommended
earlier that you do ask it not to edit .pth files.

> If I understand correctly,
> your (MvL's) suggestion that easy_install create a .pth file named
> "easy_install-$PACKAGE-$VERSION.pth" instead of "easy_install.pth" would
> indeed make it work with GNU stow.

My recommendation is that you use the already existing flag to
setup.py install that stops it from editing .pth files.

Regards,
Martin


From zookog at gmail.com  Sun May 10 14:21:57 2009
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Sun, 10 May 2009 12:21:57 -0600
Subject: [Python-Dev] how GNU stow is complementary rather than 
	alternative to distutils
In-Reply-To: <B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
References: <49D4DA72.60401@v.loewis.de> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<4A059639.7040505@v.loewis.de>
	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
	<4A070C58.4070003@v.loewis.de>
	<B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
Message-ID: <cd6401a0905101121r68f09fe5q8d627146d15a7440@mail.gmail.com>

following-up to my own post to mention one very important reason why
anyone cares:

On Sun, May 10, 2009 at 12:04 PM, Zooko Wilcox-O'Hearn <zooko at zooko.com> wrote:

> It is a beautiful, elegant hack because it is sooo dumb. ?It is also very
> nice to use the same tool to manage packages written in any programming
> language, provided only that they can build a directory tree of the right
> shape and content.

And, you are not relying on the author of the package that you are
installing to avoid accidentally or maliciously screwing up your
system.  You're not even relying on the authors of the *build system*
(e.g. the authors of distutils or easy_install).  You are relying
*only* on GNU stow to avoid accidentally or maliciously screwing up
your system, and GNU stow is very dumb, so it is easy to understand
what it is going to do and why that isn't going to irreversibly screw
up your system.

That is: you don't run the "build yourself and install into $prefix"
step as root.  This is an important consideration for a lot of people,
who absolutely refuse on principle to ever run "sudo python
./setup.py" on a system that they care about unless they wrote the
"setup.py" script themselves.  (Likewise they refuse to run "sudo make
install" on packages written in C.)

Regards,

Zooko


From pje at telecommunity.com  Sun May 10 14:48:46 2009
From: pje at telecommunity.com (P.J. Eby)
Date: Sun, 10 May 2009 14:48:46 -0400
Subject: how GNU stow is complementary rather than alternative to distutils
In-Reply-To: <B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<4A059639.7040505@v.loewis.de>
	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
	<4A070C58.4070003@v.loewis.de>
	<B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
Message-ID: <20090510184609.D238E3A4061@sparrow.telecommunity.com>

At 12:04 PM 5/10/2009 -0600, Zooko Wilcox-O'Hearn wrote:
>The thing that prevents this from working with setuptools is that
>setuptools creates a file named easy_install.pth during the "python 
>./ setup.py install --prefix=foo" if you build two different Python
>packages this way, they will each create an easy_install.pth file,
>and then when you ask GNU stow to link the two resulting packages
>into your system, it will say "You are asking me to install two
>different packages which both claim that they need to write a file
>named '/usr/local/lib/python2.5/site-packages/easy_install.pth'.

Adding --record and --single-version-externally-managed to that 
command line will prevent the .pth file from being used or needed, 
although I believe you already know this.

(What that mode won't do is install dependencies automatically.) 



From piet at cs.uu.nl  Sun May 10 14:52:07 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 10 May 2009 20:52:07 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org>
	<mailman.5361.1241924171.11746.python-list@python.org>
	<gu600c$pvt$00$1@news.t-online.com> <m2skjddmdh.fsf@cs.uu.nl>
	<gu74ld$cii$02$1@news.t-online.com>
Message-ID: <m2ocu0eqp4.fsf@cs.uu.nl>

>>>>> Peter Otten <__peter__ at web.de> (PO) wrote:

>PO> Piet van Oostrum wrote:
>>> 
>>> This is perfectly normal. 

>PO> I'm not 100% sure of that.

Why not?

>PO> Just in case you didn't notice: I'm not the OP. The above piece of junk code 
>PO> was my attempt to keep as close to the code he posted while producing the 
>PO> same output that he got.

Sorry about that. I was confused because your code was a response tp

> You'd have to show us the module. Try to make the smallest module that
> has the same effect.

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From aahz at pythoncraft.com  Sun May 10 15:30:40 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 May 2009 12:30:40 -0700
Subject: FLV download script works, but I want to enhance it
References: <mailman.5134.1241579669.11746.python-list@python.org>
	<gtur8q$b2n$1@panix3.panix.com>
	<mailman.5307.1241805968.11746.python-list@python.org>
Message-ID: <gu7a10$sot$1@panix3.panix.com>

In article <mailman.5307.1241805968.11746.python-list at python.org>,
The Music Guy  <musicguy at alphaios.net> wrote:
>On Thu, May 7, 2009 at 9:29 AM, Aahz <aahz at pythoncraft.com> wrote:
>>
>> Here's my download script to get you started figuring this out, it does
>> the wget in the background so that several downloads can run in parallel
>> from a single terminal window:
>>
>> #!/bin/bash
>>
>> echo "Downloading $1"
>> wget "$1" > /dev/null 2>&1 &
>
>Thanks for the reply, but unfortunately that script is going in the
>complete wrong direction.

Not really; my point was that you could use something similar to process
files after downloading.

>Firstly, downloading multiple files in tandem does not speed up the
>process as it merely cuts up the already limited bandwidth into even
>smaller pieces and delays every download in progress. It is much
>better to queue downloads to occur one-by-one.
>
>Secondly, that approach is based on bash rather than Python. I know I
>could use the `&` operator on a command line to background processes,
>but I would like to be able to have more control through Python and
>the use of the subprocess or threading modules.

Threading probably won't get you anywhere; I bet processing the files is
CPU-intensive.  I suggest looking into the multiprocessing module, which
would then run the file processing.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From davea at ieee.org  Sun May 10 15:33:31 2009
From: davea at ieee.org (Dave Angel)
Date: Sun, 10 May 2009 15:33:31 -0400
Subject: Q's on my first python script
In-Reply-To: <gu6im5$1hi$1@reader1.panix.com>
References: <gu6im5$1hi$1@reader1.panix.com>
Message-ID: <4A072C0B.2@ieee.org>



kj wrote:
> Below is my very firs python script.
>
> This was just a learning exercise; the script doesn't do anything
> terribly exciting: for an argument of the form YYMMDD (year, month,
> day) it prints out the corresponding string YYMMDDW, where W is a
> one-letter abbreviation for the day of the week.  E.g.
>
> % wd 090511
> 090511M
>
> The script runs OK, but I can still see a few areas of improvement,
> for which I could use your advice.
>
> 1. The name of the BadArgument exception class defined in the script
>    does not seem to me sufficiently specific.  If one were to import
>    the script in order to reuse its wkday_abbrev function, I'd like
>    this exception's name to be more unequivocally tied to this
>    script.  What I'm looking for is something like a "namespace"
>    for this script.  What's the pythonic way to construct a namespace?
>
> 2. In some python modules I've seen the idiom
>
>    if __name__ == "__main__":
>       # run some tests here
>
>    I'd like to set up tests for this script, mostly to ensure that
>    it handles the error cases properly, but I'm alread using the
>    idiom above to actually run the script under normal operation.
>    What's the typical python idiom for running tests on a *script*
>    (as opposed to a module that is normally not supposed to be run
>    directly)?
>
> 3. Still on the subject of testing, how does one capture in a
>    variable the output that would normally have gone to stdout or
>    stderr?
>
> 4. What's the python way to emit warnings?  (The script below should
>    warn the user that arguments after the first one are ignored.)
>
> 5. The variable wd is meant to be "global" to the script.  In other
>    languages I've programmed in I've seen some typographic convention
>    used for the name of such variables (e.g. all caps) to signal
>    this widened scope.  Does python have such a convention?
>
> Any comments/suggestions on these questions, or anything else about
> the script, would be much appreciated.
>
> TIA!
>
> kynn
>
>
> ----------------------------------------------------------------
> from optparse import OptionParser
> import re
> import datetime
> import sys
>
> class BadArgument(Exception): pass
>
> wd = ("M", "T", "W", "H", "F", "S", "U")
>
> def wkday_abbrev(str):
>   try:
>     mm = re.match("(\d{2})(\d{2})(\d{2})\Z", str)
>
>     y, m, d = map(lambda x: int(mm.group(x)), (1,2,3))
>
>     if y < 38: y = y + 1900
>     else: y = y + 2000
>
>     return wd[datetime.datetime(y, m, d).weekday()]
>   except (AttributeError, ValueError):
>     raise BadArgument()
>
>
> def main():
>
>   usage = '''Usage: %prog [options] YYMMDD
>        %prog -h|--help
> '''
>
>   parser = OptionParser(usage=usage)
>   parser.add_option("-n", "--no-newline", dest="nonl",
>                     action="store_true", help="omit newline in output")
>
>   (options, args) = parser.parse_args();
>
>   try:
>     sys.stdout.write("%s%s" % (args[0], wkday_abbrev(args[0])))
>     if not options.nonl: print
>
>   except (IndexError, BadArgument):
>     print usage
>     sys.exit(1)
>   except: raise
>
> if __name__ == "__main__": main()
>
>   

Other replies cover most of your questions nicely.  But for the testing 
question:

Rename this script to some other name, and call it a module
Write a new script with just three lines in it:

import  othermodule

if __name__ == "__main__":
   othermodule.main()



Now your testing code can go in "othermodule.py"

Note that I would put the argument parsing logic in the new file, so 
parts of main() would actually move.  Normally I'd call main() with two 
arguments - options, args

Your use of optparse could be more streamlined.  For example, it'll 
build the help string for you, based on the various calls to 
add_option(), and it includes its own -h and --help implicitly.




From namekuseijin.nospam at gmail.com  Sun May 10 15:40:50 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Sun, 10 May 2009 16:40:50 -0300
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <24381226-a7a0-4fbb-b928-644609e5909b@w31g2000prd.googlegroups.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
	<gu4fgi$1222$1@adenine.netfront.net>
	<24381226-a7a0-4fbb-b928-644609e5909b@w31g2000prd.googlegroups.com>
Message-ID: <gu79ud$2al5$1@adenine.netfront.net>

Carl Banks wrote:
> On May 9, 10:57 am, namekuseijin <namekuseijin.nos... at gmail.com>
> wrote:
>> Carl Banks wrote:
>>> On May 8, 7:19 pm, namekuseijin <namekusei... at gmail.com> wrote:
>>>> On May 8, 10:13 pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>>>> In Haskell, Lisp and other functional programming languages, any extra
>>>> syntax gets converted into the core lambda constructs.
>>> So?  The user still uses that syntax, so how can you claim it doesn't
>>> matter?
>>>>  In Lisp
>>>> languages, that syntax is merely user-defined macros, but in Haskell
>>>> it's builtin the compiler for convenience.
>>> I don't even know what you're saying here
>> I'm saying syntax is nothing special.  They are user-defined, as
>> functions.  And it all gets converted into functions.  Functions matter,
>> syntax is irrelevant because you can do away with it.
> 
> Nope, sorry, you're ignoring half the problem here.  Syntax is only
> irrelevant if you actually do do away with it.  As long as syntax is
> there and people use it, then it matters, regardless of whether it all
> reduces to function calls.

It's handy, yes.  It's just nothing special, specially when composing 
programs out of function composition.

> For a very benign example, consider the ways that Python and Haskell
> write listcomps:
> 
> [ x for x in ss ]
> [ x | x <- ss ]
> 
> One of these might be more readable than the other (I make no
> implication which);

Haskell uses math notation, which may not be to everyone's tastes as far 
as IT has largely left its compsci and math roots and every Joe Sixpack 
might assembly an usable app with a scripting language, some 
template-writing IDE and a few frameworks.

> however, readability has nothing to do with
> whether the compiler internally reduces it to a function call or not.
> Readibility counts, therefore syntax matters.

Function calls are perfectly readable.

> Now, maybe readability concerns don't matter to you personally, but it
> does matter to the OP, who is trying to advocate functional
> programming but is having difficulty because most purely functional
> languages have hideous minimalist syntax that turns people off.

BTW, rereading it again, the OP was originally questioning about 
compiler optimizations for purely functional constructs within Python, 
but somehow syntax got in the middle.

I don't see how "syntax would be a lot easier to understand" if it would 
"be possible to more clearly separate the pure code (without side 
effects) from the impure code (that deals with state changes, I/O, 
etc.), so that the pure code could be compiled and have aggressive 
functional transformations applied to it for efficiency."

Syntax would remain the same, I guess.

>> In functional programming languages, predefined syntax is mostly
>> irrelevant.  In Python and other imperative languages, it's absolutely
>> necessary.  That's my point.
> 
> I think you are overstating this by a lot.

Perhaps.


From __peter__ at web.de  Sun May 10 16:05:49 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 10 May 2009 22:05:49 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org>
	<mailman.5361.1241924171.11746.python-list@python.org>
	<gu600c$pvt$00$1@news.t-online.com> <m2skjddmdh.fsf@cs.uu.nl>
	<gu74ld$cii$02$1@news.t-online.com> <m2ocu0eqp4.fsf@cs.uu.nl>
Message-ID: <gu7c2j$efo$03$1@news.t-online.com>

Piet van Oostrum wrote:

>>>>>> Peter Otten <__peter__ at web.de> (PO) wrote:
> 
>>PO> Piet van Oostrum wrote:
>>>> 
>>>> This is perfectly normal.
> 
>>PO> I'm not 100% sure of that.
> 
> Why not?

What you quoted was not code I would /normally/ write. I was playing with 
the context and meaning of your sentence.

Sorry, this is just a joke that went awry.

Peter



From socyl at 987jk.com.invalid  Sun May 10 16:43:21 2009
From: socyl at 987jk.com.invalid (kj)
Date: Sun, 10 May 2009 20:43:21 +0000 (UTC)
Subject: Q's on my first python script
References: <gu6im5$1hi$1@reader1.panix.com>
	<0216ec41$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <gu7e99$140$1@reader1.panix.com>

In <0216ec41$0$20647$c3e8da3 at news.astraweb.com> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

>On Sun, 10 May 2009 12:52:21 +0000, kj wrote:

>> 1. The name of the BadArgument exception class defined in the script
>>    does not seem to me sufficiently specific.  If one were to import the
>>    script in order to reuse its wkday_abbrev function, I'd like this
>>    exception's name to be more unequivocally tied to this script.  What
>>    I'm looking for is something like a "namespace" for this script. 
>>    What's the pythonic way to construct a namespace?

>You already have one. The module you have created is a namespace. If your 
>script is called "myscript.py", then to use it elsewhere you would do:

>import myscript
>raise myscript.BadArgument


>> 2. In some python modules I've seen the idiom
>> 
>>    if __name__ == "__main__":
>>       # run some tests here
>> 
>>    I'd like to set up tests for this script, mostly to ensure that it
>>    handles the error cases properly, but I'm alread using the idiom
>>    above to actually run the script under normal operation. What's the
>>    typical python idiom for running tests on a *script* (as opposed to a
>>    module that is normally not supposed to be run directly)?

>I sometimes give my scripts an option -t or --self-test, and then run 
>tests if that option is passed on the command line.

>Alternatively, put your tests in another module, say, myscript_tests.py, 
>and then just run that when you want to test myscript.

> 
>> 3. Still on the subject of testing, how does one capture in a
>>    variable the output that would normally have gone to stdout or
>>    stderr?

>Normally you would write the function to *return* the result, rather than 
>*print* the result. If all output goes through the function return 
>mechanism, then it's easy to capture: x = func().

>However, for cases where the function does print directly, you can 
>redefine stdout and strerr to be any file-like object, so you can do 
>something like this:


># untested
>import sys
>import cStringIO
>save_stdout, save_stderr = sys.stdout, sys.stderr
>c1 = cStringIO.StringIO()
>c2 = cStringIO.StringIO()
>try:
>    sys.stdout = c1
>    sys.stderr = c2
>    result = func(*args, **kwargs)  # normally prints some stuff
>finally:
>    # restore standard files
>    sys.stdout = save_stdout
>    sys.stderr = save_stderr
>captured_from_stdout = c1.getvalue()
>captured_from_stderr = c2.getvalue()


> 
>> 4. What's the python way to emit warnings?  (The script below should
>>    warn the user that arguments after the first one are ignored.)

>import warnings
>warnings.warn("The end of the world is coming!")


>> 5. The variable wd is meant to be "global" to the script.  In other
>>    languages I've programmed in I've seen some typographic convention
>>    used for the name of such variables (e.g. all caps) to signal this
>>    widened scope.  Does python have such a convention?

>As a general rule, it's best to avoid globals variables as much as 
>possible.

>One convention I occasionally use is to prefix global variables with a 
>lowercase g. And then ruthlessly refactor my code until any variable 
>starting with a lowercase g is removed :)


Thanks!  That was very helpful!

Kynn
-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From socyl at 987jk.com.invalid  Sun May 10 16:52:04 2009
From: socyl at 987jk.com.invalid (kj)
Date: Sun, 10 May 2009 20:52:04 +0000 (UTC)
Subject: Q's on my first python script
References: <gu6im5$1hi$1@reader1.panix.com>
Message-ID: <gu7epk$mt6$1@reader1.panix.com>



Thank you all very much!  I really appreciate it.

kynn
-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From socyl at 987jk.com.invalid  Sun May 10 17:00:23 2009
From: socyl at 987jk.com.invalid (kj)
Date: Sun, 10 May 2009 21:00:23 +0000 (UTC)
Subject: What's the use of the else in try/except/else?
Message-ID: <gu7f97$mt6$2@reader1.panix.com>



I know about the construct:

try:
    # do something 
except ...:
    # handle exception
else:
    # do something else

...but I can't come with an example in which the same couldn't be
accomplished with

try:
    # do something
    # do something else
except ...:
    # handle exception

The only significant difference I can come up with is that in the
second form, the except clause may be masking some unexpected
exceptions from the "do something else" part.  Is this the rationale
behind this else clause?  Or is there something more to it?

TIA!

kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From Shawn at Milochik.com  Sun May 10 17:52:42 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Sun, 10 May 2009 17:52:42 -0400
Subject: Downloading most recently modified files
In-Reply-To: <23471969.post@talk.nabble.com>
References: <23432457.post@talk.nabble.com>
	<2dc0c81b0905071336l365f6b3aq51761873b52e38d0@mail.gmail.com>
	<23471969.post@talk.nabble.com>
Message-ID: <2dc0c81b0905101452h4e5cad78g6d4f677fa116206a@mail.gmail.com>

On Sun, May 10, 2009 at 1:04 PM, AllenLars <allenreas at gmail.com> wrote:
>
> Thanks Shawn.  I went through the ftplib info and I was able to generate a
> list.  I am needing to figure out parsing the list.
>
> AllenLars


Well, start by separating out the date and the file name. You'll want
the date for sorting, and the file name for when you decide to
download it. If you want help with regular expressions, let me know.
If so, post a sample of the code you have so far for parsing, sample
input (the raw listing), and sample output showing exactly how you
want it to look. As long as you write some code (even if it's not
working the way you want), I don't mind helping you fix it up.


From pavlovevidence at gmail.com  Sun May 10 18:18:37 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sun, 10 May 2009 15:18:37 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com> 
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com> 
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com> 
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com> 
	<gu4fgi$1222$1@adenine.netfront.net>
	<24381226-a7a0-4fbb-b928-644609e5909b@w31g2000prd.googlegroups.com>
	<gu79ud$2al5$1@adenine.netfront.net>
Message-ID: <2abd8518-fbb1-4a84-b84d-4e1e4a74aa3b@s1g2000prd.googlegroups.com>

On May 10, 12:40?pm, namekuseijin <namekuseijin.nos... at gmail.com>
wrote:
> Carl Banks wrote:
> > Now, maybe readability concerns don't matter to you personally, but it
> > does matter to the OP, who is trying to advocate functional
> > programming but is having difficulty because most purely functional
> > languages have hideous minimalist syntax that turns people off.
>
> BTW, rereading it again, the OP was originally questioning about
> compiler optimizations for purely functional constructs within Python,
> but somehow syntax got in the middle.

Syntax--the thing you claim doesn't matter--got in the middle because
it was the main factor that drove the OP to look for alternatives to
Haskell.

That's what makes your entire argument ridiculous; you are making this
theoretical argument like, "everything reduces to a function so it
doesn't matter what syntax you use," yet people in the real world are
out there trying to find alternatives because functional languages'
syntax sucks so bad in general.


> I don't see how "syntax would be a lot easier to understand" if it would
> "be possible to more clearly separate the pure code (without side
> effects) from the impure code (that deals with state changes, I/O,
> etc.), so that the pure code could be compiled and have aggressive
> functional transformations applied to it for efficiency."
>
> Syntax would remain the same, I guess.

You totally missed the point.

The thing that would make the syntax a lot easier to understand is
that it's in Python and not Haskell.

The reason the OP was asking about separating pure code from impure
was to see if some subset of Python could be used as a pure functional
language, that way they could employ Python and its already-much-
better-than-Haskell's syntax as a pedagogical replacement for Haskell.

I am sure there are many people who think that even "f a b" is cryptic
compared to "f(a,b)", but if that's the only issue it wouldn't be that
big of a deal.  It's not the only issue.  When a language requires you
to read and write stuff like "map :: (x -> y) -> f x -> f y" or "f s@
(x:xs) = x:s" then it's going to turn a lot of people off.


Carl Banks


From Scott.Daniels at Acm.Org  Sun May 10 18:52:23 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 10 May 2009 15:52:23 -0700
Subject: What's the use of the else in try/except/else?
In-Reply-To: <gu7f97$mt6$2@reader1.panix.com>
References: <gu7f97$mt6$2@reader1.panix.com>
Message-ID: <w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net>

kj wrote:
> ...  I can't come with an example in which the same couldn't be
> accomplished with
> 
> try:
>     # do something
>     # do something else
> except ...:
>     # handle exception
> 
> The only significant difference I can come up with is that in the
> second form, the except clause may be masking some unexpected
> exceptions from the "do something else" part.  Is this the rationale
> behind this else clause?  Or is there something more to it?

Yes, in a way.  The idea of catching particular exceptions is to only
handle exceptions you expect (let the others go out to more general
reporters).  So, not only should you choose the tightest exception to
catch that you can, but you should look for it in a very narrow window:
exactly where you expect it.

     try:
         v = mumble.field
     except AttributeError:
         pass
     else:
         sys.warning('field was actually there?')

as opposed to:

     try:
         v = mumble.field
         sys.warning('field was actually there?')
     except AttributeError:
         pass

The idea is to make it clear what you expect might go
wrong that you are prepared to handle.

--Scott David Daniels
Scott.Daniels at Acm.Org


From toby at tobiah.org  Sun May 10 19:06:34 2009
From: toby at tobiah.org (Tobiah)
Date: Sun, 10 May 2009 23:06:34 GMT
Subject: There may be a much better way to manage artillery.
Message-ID: <_5JNl.4895$qP.3696@newsfe03.iad>

I'm writing a video game with armed space ships.
I decided to make a class to manage all of the bullets
that may be on the screen at a given time:

class Bullets():

        def __init__(self):
                self.bullets = []

        def update(self):
                temp = []
                for bullet in self.bullets:
                        bullet.update()
                        bullet.time_to_live -= 1
                        if bullet.time_to_live:
                                temp.append(bullet)
                self.bullets = temp

        def add(self, new_bullet):
                self.bullets.append(new_bullet)

When the main loop calls .update() on the bullets
object, I want it to decrement a counter on each
bullet, and destroy the bullets who's time has come.

I wanted the bullets to be responsible for destroying
themselves, but a little Googling brought me to points
about dangling references and how an object is not allowed
(nor does it seem to have the means) to destroy itself. 
That's why I made this wrapper class for all of the bullets.

The idea is to copy bullets with time left into a temp list
and then overwrite the man bullets array with the good bullets.
I believe that the other bullets will be garbage collected.
I could not delete the items in place within the loop, of course.
Was there a better container than a list for my purposes?

Above is what I settled on, but I wonder
whether my approach is a good one.

Thanks very much,

Toby


From rhodri at wildebst.demon.co.uk  Sun May 10 19:10:14 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 11 May 2009 00:10:14 +0100
Subject: ISO exemplary Python scripts
In-Reply-To: <gu49s1$g84$1@reader1.panix.com>
References: <gu2j3n$a90$1@reader1.panix.com>
	<802a051qoqmpnih0j2su9hhriqumagu326@4ax.com>
	<gu49s1$g84$1@reader1.panix.com>
Message-ID: <op.utqlbcpoa8ncjz@gnudebst>

On Sat, 09 May 2009 17:09:38 +0100, kj <socyl at 987jk.com.invalid> wrote:

> I know that in the python world the distinction between a script
> and a (library) module is not so clear-cut, and it is common for
> library modules to have "top-level" stuff (typically test code)
> that gets run if the module is invoked directly from the command
> line.  But this is not *really* a script as I understand it, because,
> even though it "runs" directly from the command-line, it lacks the
> typical CLI amenities, such as command-line flags, help messages,
> diagnostic messages that are aimed to the "naive user" (i.e. as
> opposed to the developer), etc.  The coding of these "CLI amenities"
> is one of aspects of these "exemplary Python scripts" I'm most
> interested in learning about.

While I don't entirely agree with your definition of a script,
for a lot of those CLI amenities "optparse" is your friend.
Possibly also your enemy if you don't want to do things its way,
but it does at least make parameter handling in a user-friendly way
easy.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From Graham.Dumpleton at gmail.com  Sun May 10 19:11:09 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Sun, 10 May 2009 16:11:09 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<12ef7b00-f0c5-4030-a353-533d93d23cdd@r3g2000vbp.googlegroups.com>
Message-ID: <794f117f-4df5-4c6c-be68-f901959b2579@y10g2000prc.googlegroups.com>

On May 10, 3:40?am, Paul Boddie <p... at boddie.org.uk> wrote:
> On 9 Mai, 01:36, dpapathanasiou <denis.papathanas... at gmail.com> wrote:
>
>
>
> > Apache's configure utility (I'm using httpd version 2.2.11) doesn't
> > explicitly describe an expat library option.
>
> > Also, if libexpat is version 1.95.2, wouldn't I have to get version
> > 2.0 to be compatible with pyexpat?
>
> The aim would be to persuade Apache to configure itself against the
> same Expat library that pyexpat is using, which would involve the
> headers and libraries referenced during the pyexpat configuration
> process, although I seem to recall something about pyexpat bundling
> its own version of Expat - that would complicate matters somewhat.
>
> > If anyone has any advice or suggestions, I'd appreciate hearing them.
>
> Expat might be getting brought into Apache via mod_dav:
>
> http://www.webdav.org/mod_dav/install.html
>
> Perhaps disabling mod_dav when configuring Apache might drop Expat
> from Apache's library dependencies.

The OP was using Python 2.5, so shouldn't be an issue because pyexpat
properly name space prefixes its version of expat. See:

  http://code.google.com/p/modwsgi/wiki/IssuesWithExpatLibrary

where explicitly says that only applies to Python prior to Python 2.5.

His problem is therefore likely to be something completely different.

Graham


From rhodri at wildebst.demon.co.uk  Sun May 10 19:48:25 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 11 May 2009 00:48:25 +0100
Subject: There may be a much better way to manage artillery.
In-Reply-To: <_5JNl.4895$qP.3696@newsfe03.iad>
References: <_5JNl.4895$qP.3696@newsfe03.iad>
Message-ID: <op.utqm2zd8a8ncjz@gnudebst>

On Mon, 11 May 2009 00:06:34 +0100, Tobiah <toby at tobiah.org> wrote:

[Snippety snip]

> I wanted the bullets to be responsible for destroying
> themselves, but a little Googling brought me to points
> about dangling references and how an object is not allowed
> (nor does it seem to have the means) to destroy itself.
> That's why I made this wrapper class for all of the bullets.

An object can, however, erase its representation from the
screen and tell whatever control system is keeping track
of objects to forget about it.  Once the last reference to
the object is deleted, the object will be garbage collected.

What framework are you writing your game in?  Pygame has
facilities for handling this sort of thing fairly
straightforwardly.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Sun May 10 20:12:04 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 11 May 2009 01:12:04 +0100
Subject: Wrapping comments
In-Reply-To: <towb-63CE3D.09322210052009@news.individual.de>
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
Message-ID: <op.utqn6eu0a8ncjz@gnudebst>

On Sun, 10 May 2009 08:32:23 +0100, Tobias Weber <towb at gmx.net> wrote:

> In article <m2bpq2ngup.fsf at googlemail.com>,
>  Arnaud Delobelle <arnodel at googlemail.com> wrote:
>
>> A simple Alt-Q will reformat everything nicely.
>
> Now that's something. Thanks!
>
> (still not gonna use software that doesn't let me type # because it's
> alt+3 on a UK layout; having to re-learn or configure that is just sick)

What on earth are you talking about?  '#' has its own key on a UK layout
(shared with '~', but you know what I mean), just to the left of the
RETURN key.  Emacs is my editor of choice, and I've never once come
across anything like this.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From martin.hellwig at dcuktec.org  Sun May 10 20:12:26 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Mon, 11 May 2009 01:12:26 +0100
Subject: SimpleXMLRPCServer and creating a new object on for each new
	client request.
In-Reply-To: <m2ws8qf1fw.fsf@cs.uu.nl>
References: <mailman.5173.1241647285.11746.python-list@python.org>
	<m2ab5ojyff.fsf@cs.uu.nl>
	<09a3e655-06ad-46cb-9955-303948f2b271@e24g2000vbe.googlegroups.com>
	<m2ws8qf1fw.fsf@cs.uu.nl>
Message-ID: <5LSdnUoJjZr28JrXnZ2dnUVZ8o2dnZ2d@bt.com>

Piet van Oostrum wrote:
>>>>>> google at smetj.net (g) wrote:
> 
>> g> Well, I think Martin's example will suit my needs.
> 
>> g> Thanks for the explanation!
> 
> His client code is unnecessarily complicated with 3 session variables.
> The following code does the same:
> 
>     SESSION = xmlrpclib.ServerProxy(URL_PORT)
>     print(SESSION.show_random())
>     print(SESSION.show_random())
>     SESSION.shutdown_service()
> 
I was actually aware of that, but I thought it would be more educational 
if I rewrote Jelle's example by using code conformity and a way to test 
server and client in a single script instead of just rewriting it to the 
given intent. With the knowledge provided, Jelle should be able to 
redesign his program to what he actually wants to do with it and cutting 
out the croft himself.

P.S. Piet ben je toevallig lid van NLUUG?

-- 
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'


From showell30 at yahoo.com  Sun May 10 20:17:23 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 10 May 2009 17:17:23 -0700 (PDT)
Subject: help with recursive whitespace filter in
References: <mailman.5380.1241971815.11746.python-list@python.org> 
	<53fc8859-5254-4f49-94f3-c6c430d77371@z5g2000vba.googlegroups.com> 
	<0291fad2-a744-4ced-bcd4-fb8529e968b8@x29g2000prf.googlegroups.com>
Message-ID: <3c107c60-09a1-49b7-9b1d-32d32dce4f7d@x6g2000vbg.googlegroups.com>

On May 10, 10:23?am, rustom <rustompm... at gmail.com> wrote:
> On May 10, 9:49?pm, Steve Howell <showel... at yahoo.com> wrote:
>
>
>
> > On May 10, 9:10?am, Rustom Mody <rustompm... at gmail.com> wrote:
>
> > > I am trying to write a recursive filter to remove whitespace-only
> > > nodes for minidom.
> > > The code is below.
>
> > > Strangely it deletes some whitespace nodes and leaves some.
> > > If I keep calling it -- like so: fws(fws(fws(doc))) ?then at some
> > > stage all the ws nodes disappear
>
> > > Does anybody have a clue?
>
> > > from xml.dom.minidom import parse
>
> > > #The input to fws is the output of parse("something.xml")
>
> > > def fws(ele):
> > > ? ? """ filter white space (recursive)"""
>
> > > ? ?for c in ele.childNodes:
> > > ? ? ? ? if isWsNode(c):
> > > ? ? ? ? ? ? ele.removeChild(c)
> > > ? ? ? ? ? ? #c.unlink() Makes no diff whether this is there or not
> > > ? ? ? ? elif c.nodeType == ele.ELEMENT_NODE:
> > > ? ? ? ? ? ? fws(c)
>
> > > def isWsNode(ele):
> > > ? ? return (ele.nodeType == ele.TEXT_NODE and not ele.data.strip())
>
> > I would avoid doing things like delete/remove in a loop. ?Instead
> > build a list of things to delete.
>
> Yeah I know. I would write the whole damn thing functionally if I knew
> how. ?But cant figure out the API.
> I actually started out to write a (haskell-style) copy out the whole
> tree minus the unwanted nodes but could not figure it out

You can use list comprehensions for a more functional style.

Instead of deleting the unwanted nodes in place, try to create new
lists of just the wanted results.


From apt.shansen at gmail.com  Sun May 10 20:21:56 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 10 May 2009 17:21:56 -0700
Subject: Pythonic way to normalize vertical whitespace
In-Reply-To: <1241798017.7066.1314483739@webmail.messagingengine.com>
References: <1241798017.7066.1314483739@webmail.messagingengine.com>
Message-ID: <7a9c25c20905101721g4953dd53i826e9774c8c68092@mail.gmail.com>

On Fri, May 8, 2009 at 8:53 AM, <python at bdurham.com> wrote:

>  I'm looking for suggestions on technique (not necessarily code) about the
> most pythonic way to normalize vertical whitespace in blocks of text so that
> there is never more than 1 blank line between paragraphs. Our source text
> has newlines normalized to single newlines (\n vs. combinations of \r and
> \n), but there may be leading and trailing whitespace around each newline.
>

I'm not sure what's more Pythonic in this case, but the approach I'd use is
a generator. Like so:

--- code to follow --

def cleaner(body):
    empty = False
    for line in body.splitlines():
        line = line.rstrip()
        if line:
            empty = False
            yield line
        else:
            if empty:
                continue
            else:
                empty = True
                yield ''

Text = """
This is my first paragraph.

This is my second.


This is my third.
This is my fourth.

This is my fifth.



This is my sixth.





This is my seventh.

Okay?
"""

print '\n'.join(cleaner(Text))

--- end code ---

You maybe want to tweak the logic a bit depending on how you want to handle
initial blank lines or such, and I'm two paragraphs w/o a blank line between
them (you talk some of going from \n\n\n to \n\n, so I'm not sure if you
want to allow blank lines separating the paragraphs or require it).

I guess this basically is your first approach, just specifically going with
"Use a generator to do it" instead of regular list building cuz that should
be faster and cleaner int his case.... and I don't think the third approach
is really all that needed. Python can do this pretty quickly.

The second approach seems distinctly unPythonic. I use regular expressions
in several places, mind, but if there's a straight-forward clean way to do
anything without them that always seems like the Pythonic thing to me. :)

But that's just me :)

--S
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From gagsl-py2 at yahoo.com.ar  Sun May 10 20:44:59 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 10 May 2009 21:44:59 -0300
Subject: How can I dynamically insert a base class in a given class
References: <iqshd6-qkf.ln1@archaeopteryx.softver.org.mk>
Message-ID: <op.utqpo9rcx6zn5v@gabriel.sleipnir-bsas>

En Sun, 10 May 2009 00:04:17 -0300, ?????? ??????????? <gdamjan at gmail.com>  
escribi?:

> How can I dynamically insert a base class in a given class? Yeah, I'm
> writing a class decorator that needs to manipulate the class by
> inserting another base class in it.

In this case, as you want to modify the base classes, I think a metaclass  
is more apropiate (the decorator acts too late, *after* the class has  
already been created).
Based on your code:

class ReallyBase(object):
    def someimportantmethod(self):
      return 'really really'

def dynamically_determine_metaclass(args):

     class MyMetaclass(type):
        def __new__(meta, name, bases, namespace):
          bases = (ReallyBase,) + bases
          namespace['some_value'] = args
          return type.__new__(meta, name, bases, namespace)

     return MyMetaclass

class Unsuspecting(object):
    __metaclass__ = dynamically_determine_metaclass(123)
    def stuff(self):
      return "ok"

u = Unsuspecting()
print u.stuff(), u.someimportantmethod(), u.some_value,  
Unsuspecting.some_value

-- 
Gabriel Genellina



From draeath.spamtrap at gmail.com  Sun May 10 22:25:56 2009
From: draeath.spamtrap at gmail.com (draeath)
Date: Sun, 10 May 2009 22:25:56 -0400
Subject: There may be a much better way to manage artillery.
References: <_5JNl.4895$qP.3696@newsfe03.iad>
Message-ID: <_rKdnU2errA3EZrXnZ2dnUVZ_gFi4p2d@giganews.com>

Tobiah wrote:

> I'm writing a video game with armed space ships.
> I decided to make a class to manage all of the bullets
> that may be on the screen at a given time:
> 
> class Bullets():
> 
>         def __init__(self):
>                 self.bullets = []
> 
>         def update(self):
>                 temp = []
>                 for bullet in self.bullets:
>                         bullet.update()
>                         bullet.time_to_live -= 1
>                         if bullet.time_to_live:
>                                 temp.append(bullet)
>                 self.bullets = temp
> 
>         def add(self, new_bullet):
>                 self.bullets.append(new_bullet)
> 
> When the main loop calls .update() on the bullets
> object, I want it to decrement a counter on each
> bullet, and destroy the bullets who's time has come.
> 
> I wanted the bullets to be responsible for destroying
> themselves, but a little Googling brought me to points
> about dangling references and how an object is not allowed
> (nor does it seem to have the means) to destroy itself.
> That's why I made this wrapper class for all of the bullets.
> 
> The idea is to copy bullets with time left into a temp list
> and then overwrite the man bullets array with the good bullets.
> I believe that the other bullets will be garbage collected.
> I could not delete the items in place within the loop, of course.
> Was there a better container than a list for my purposes?
> 
> Above is what I settled on, but I wonder
> whether my approach is a good one.
> 
> Thanks very much,
> 
> Toby

This also gives you the means to destroy the oldest bullet when creating a 
new one, once some arbitrary limit was reached. Think back to how old games 
like Raptor worked.

If you had the bullets take care of their lifetime themselves, you would 
have to have more code touching all the bullets to do this. Now, you can add 
a little bit while you are already working through them all, saving yourself 
some cycles I would wager.




From http  Sun May 10 22:33:04 2009
From: http (Paul Rubin)
Date: 10 May 2009 19:33:04 -0700
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
	<gu4fgi$1222$1@adenine.netfront.net>
	<24381226-a7a0-4fbb-b928-644609e5909b@w31g2000prd.googlegroups.com>
	<gu79ud$2al5$1@adenine.netfront.net>
	<2abd8518-fbb1-4a84-b84d-4e1e4a74aa3b@s1g2000prd.googlegroups.com>
Message-ID: <7xws8oid27.fsf@ruckus.brouhaha.com>

Carl Banks <pavlovevidence at gmail.com> writes:

> Syntax--the thing you claim doesn't matter--got in the middle because
> it was the main factor that drove the OP to look for alternatives to
> Haskell.

I don't think so.  The OP said that "... the syntax would be a lot
easier to understand, than most functional languages, like Haskell".
He didn't say that Haskell syntax caused him to look for alternatives
and didn't say that Haskell wouldn't still be difficult even if its
syntax were simpler.  Hint: Liskell (Haskell with S-expression syntax)
is still difficult.

> yet people in the real world are out there trying to find
> alternatives because functional languages' syntax sucks so bad in general.

Again, I don't think so.  Functional languages' syntax turns some
people off before they even look at other aspects closely, just like
Python's indentation-based syntax turns some people off.  But, once
you get past the syntax, functional languages STILL present a lot of
obstacles that lots of users never get past.

> The reason the OP was asking about separating pure code from impure
> was to see if some subset of Python could be used as a pure functional
> language, that way they could employ Python and its already-much-
> better-than-Haskell's syntax as a pedagogical replacement for Haskell.

That wouldn't make sense at all.  60% of what makes Haskell different
(and harder) than Python is probably the complicated (but powerful)
static type system; 35% is the nonstrict evaluation strategy, and 5%
the syntax.  If you somehow added a method in Python to separate pure
from impure code, but it was still a dynamic language with strict
evaluation, you'd only be 5% of the way to replacing Haskell.


From prakash.stack at gmail.com  Sun May 10 23:06:20 2009
From: prakash.stack at gmail.com (prakash jp)
Date: Mon, 11 May 2009 08:36:20 +0530
Subject: stand alone exec
Message-ID: <805f59d50905102006obd4e42bo6b8923b62f84f6d6@mail.gmail.com>

Hi all,

I want to run dos commands through python stand alone execs. The created
Python stand alone executable (py2exe)  works fine

in my machine but on transferring the "dist" folder to other systems the
executable fails to run.

I tried to copy the MSVCP90.dll in the "dist" folder. Also tried to exclude
the same dll in the options of the setup.py file

The error reads as follows :

"The application has failed to start because the application configuration
is incorrect. Reinstalling the application may fix this problem".

Details of the installed setup files may be useful :

1- python-2.6.1.msi
2- py2exe-0.6.9.win32-py2.6.exe
3- pywin32-212.win32-py2.6.exe

Thanks in advance

Regards
Prakash
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From viniciusban at gmail.com  Sun May 10 23:30:16 2009
From: viniciusban at gmail.com (Vinicius Assef)
Date: Mon, 11 May 2009 00:30:16 -0300
Subject: Web Based Front End?
In-Reply-To: <18804639-32ae-4bdf-9ecc-4c8b21f8a43f@g19g2000vbi.googlegroups.com>
References: <18804639-32ae-4bdf-9ecc-4c8b21f8a43f@g19g2000vbi.googlegroups.com>
Message-ID: <f94f764e0905102030y15e5c19bq6e4ca8c21fccf77a@mail.gmail.com>

On Thu, May 7, 2009 at 10:52 PM,  <baseelinger at yahoo.com> wrote:
[snip]
>
> So, my question is what is the best method to be able to have a user
> enter specific data on a web page, have that data be passed to the
> Python script and then have the output returned to the web page?

Django is the buzzword, among python community here, in Brazil.

In fact it is really powerful. Give it a try. ;-)

--
[ ]s
Vinicius Assef.
http://aprenda-python.blogspot.com


From kalman_g at msn.com  Sun May 10 23:57:05 2009
From: kalman_g at msn.com (GKalman)
Date: Sun, 10 May 2009 20:57:05 -0700 (PDT)
Subject: Importing from a module which contains more than one Class...
Message-ID: <23476815.post@talk.nabble.com>


OS= MS Vista
File structure:
.../Module  (i.e a Folder with 2 sub-folders)
    .../Module_Class    (sub-folder #1)
               /MyClass.py
    .../Module_Class_Testing  (sub_folder #2)
             /module_class_driver.py

Here is the code for the two (simplified) Python files:


#this is module_class_driver.py
#======================
import sys

dir1='C:\\Programming\\Python\\Prototypes\\Core_Python_Prototypes\\Module\\Module_Class'
sys.path.append(dir1)


from MyClass import *
from MyOtherClass import *     # error msg: no such module!

c=MyClass(2.5)
print c.double_it()

cc=MyOtherClass(5.0)          #error
print cc.triple_it()               #error


#this is MyClass.py
#============
class MyClass:
    def __init__(self,x):
        self.x=x
    def double_it(self):
        return 2*self.x

class MyOtherClass:
    def __init__(self,y):
        self.y=y
    def triple_it(self):
        return 3*self.y

Question:
*******
As I mentioned above,  the code for MyClass & MyOtherClass is in the same
file . This program only works with a single Class in a file. That is when
the File name is the SAME as the Class name.

How to import from a File which contains more than one (unrelated) Classes?



-- 
View this message in context: http://www.nabble.com/Importing-from-a-module-which-contains-more-than-one-Class...-tp23476815p23476815.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From wuwei23 at gmail.com  Mon May 11 00:19:52 2009
From: wuwei23 at gmail.com (alex23)
Date: Sun, 10 May 2009 21:19:52 -0700 (PDT)
Subject: Importing from a module which contains more than one Class...
References: <mailman.5405.1242014228.11746.python-list@python.org>
Message-ID: <c2279eb3-1204-4830-8459-61d2b00b669b@f1g2000prb.googlegroups.com>

GKalman <kalma... at msn.com> wrote:
> from MyClass import *
> from MyOtherClass import * ? ? # error msg: no such module!
>
> As I mentioned above, ?the code for MyClass & MyOtherClass is in the same
> file . This program only works with a single Class in a file. That is when
> the File name is the SAME as the Class name.
>
> How to import from a File which contains more than one (unrelated) Classes?

You seem to have misunderstood how 'import' works, I strongly
recommend re-reading the tutorial section:
http://docs.python.org/tutorial/modules.html

Basically, the import statement has two forms:

   1. from <module> import <contents>
   2. import <module>

So your example of 'from <classname> import *' just doesn't make a lot
of sense within Python.

If MyClass.py contains two classes, MyClass and MyOtherClass, you
should be able to import them with:

   from MyClass import MyClass, MyOtherClass

However, you _should_ be already getting _everything_ MyClass.py
contains as you're using the grab-all asterisk. Could you open a
python shell in your Module_Class folder, type 'from MyClass import
MyClass, MyOtherClass', and past whatever traceback you get here?


From timr at probo.com  Mon May 11 00:34:26 2009
From: timr at probo.com (Tim Roberts)
Date: Sun, 10 May 2009 21:34:26 -0700
Subject: ISO exemplary Python scripts
References: <gu2j3n$a90$1@reader1.panix.com>
	<802a051qoqmpnih0j2su9hhriqumagu326@4ax.com>
	<gu49s1$g84$1@reader1.panix.com>
Message-ID: <6eaf05d1tmhmhrb7tvd1rsojhco22utaq4@4ax.com>

kj <socyl at 987jk.com.invalid> wrote:
>
>Thanks, but the last bit of your post ("...most of which have the
>ability to run by themselves") makes me wonder whether we mean the
>same thing when we talk of "scripts."  Can you give me an example
>of a script that *does not* have the ability to run by itself?
>When I use the word "script" I mean, *by definition*, a piece of
>code that has the ability to run by itself.
>
>I know that in the python world the distinction between a script
>and a (library) module is not so clear-cut,

Exactly.  This is true for many of the languages that are traditionally
interpreted.  Things start off as standalone applications and morph into
general purpose modules, or vice versa.  As a result, I lazily call any
Python source file a "script".

>But this is not *really* a script as I understand it, because,
>even though it "runs" directly from the command-line, it lacks the
>typical CLI amenities, such as command-line flags, help messages,
>diagnostic messages that are aimed to the "naive user" (i.e. as
>opposed to the developer), etc.  The coding of these "CLI amenities"
>is one of aspects of these "exemplary Python scripts" I'm most
>interested in learning about.

In my vocabulary, I'd probably call this an "application".

I guess my basic point is that the standard library contains good examples
of Python programming, and the "Python way of thinking".  Command-line
argument processing is not a particularly unique task, so the same
techniques that work for parsing things from files, or for handling
arguments in a list, work equally well for handling arguments, especially
with the help of getopt and optparse.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From tjreedy at udel.edu  Mon May 11 01:47:06 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 11 May 2009 01:47:06 -0400
Subject: unicode bit me
In-Reply-To: <05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>	<mailman.5310.1241809502.11746.python-list@python.org>	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>	<mailman.5346.1241892428.11746.python-list@python.org>	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>	<slrnh0d0gd.mi5.nick@irishsea.home.craig-wood.com>
	<05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>
Message-ID: <gu8e4o$7uf$1@ger.gmane.org>

anuraguniyal at yahoo.com wrote:

> so unicode(obj) calls __unicode__ on that object

It will look for the existence of type(ob).__unicode__ ...

 > and if it isn't there __repr__ is used

According to the below, type(ob).__str__ is tried first.

> __repr__ of list by default return a str even if __repr__ of element
> is unicode

 From the fine library manual, built-in functions section:
(I reccommend using it, along with interactive experiments.)

"repr( object)
Return a string ..."

"str( [object])
Return a string ..."

"unicode( [object[, encoding [, errors]]])

Return the Unicode string version of object using one of the following 
modes:

If encoding and/or errors are given, ...

If no optional parameters are given, unicode() will mimic the behaviour 
of str() except that it returns Unicode strings instead of 8-bit 
strings. More precisely, if object is a Unicode string or subclass it 
will return that Unicode string without any additional decoding applied.

For objects which provide a __unicode__() method, it will call this 
method without arguments to create a Unicode string. For all other 
objects, the 8-bit string version or representation is requested and 
then converted to a Unicode string using the codec for the default 
encoding in 'strict' mode.
"

'unicode(somelist)' has no optional parameters, so skip to third 
paragraph.  Somelist is not a unicode instance, so skip to the last 
paragraph.  If you do dir(list) I presume you will *not* see 
'__unicode__' listed.  So skip to the last sentence.
unicode(somelist) == str(somelist).decode(default,'strict').

I do not believe str() and repr() are specifically documented for 
builtin classes other than the general description, but you can figure 
that str(collection) or repr(collection) will call str or repr on the 
members of the collection in order to return a str, as the doc says. 
(Details are available by experiment.)  Str(uni_string) encodes with the 
default encoding, which seems to be 'ascii' in 2.x.  I am sure it uses 
'strict' errors.

I would agree that str(some_unicode) could be better documented, like 
unicode(some_str) is.

> so my only solution looks like to use my own list class everywhere i
> use list
> class mylist(list):
>     def __unicode__(self):
>         return u"["+u''.join(map(unicode,self))+u"]"

Or write a function and use that instead, or, if and when you can, 
switch to 3.x where str and repr accept and produce unicode.

tjr



From rogerb at rogerbinns.com  Mon May 11 02:55:52 2009
From: rogerb at rogerbinns.com (Roger Binns)
Date: Sun, 10 May 2009 23:55:52 -0700
Subject: Learning C++ for Python Development
In-Reply-To: <5d97efc2-af41-4dd6-a243-50f85d54746c@s16g2000vbp.googlegroups.com>
References: <5d97efc2-af41-4dd6-a243-50f85d54746c@s16g2000vbp.googlegroups.com>
Message-ID: <gu8i5o$g30$1@ger.gmane.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

joshua.pearce at gmail.com wrote:
> Or, just give me some general advice on learning C++ for Python?

You may want to start with Cython first.  It lets you intersperse C and
C level information with Python code to produce extensions.  That will
give you a gentler introduction to using a C like language with Python
and for many real world uses is actually sufficient to get C levels of
performance and interfacing with Python.

After you get that working then you can try coding your own extensions
(the Python docs include all the necessary information) and also trying
other tools such as SWIG which automate some of the code for wrapping
C++, or the wrapping functionality present in Boost.

I find it most helpful to explore doing the same thing in multiple
different ways as it teaches you what is important and what isn't.
Later on it will help you a lot better in choosing the right tool for
the job (no one tool or approach is perfect) and help evaluate anything
that comes up later.

My suggestion would be to pick a particular task and code it in pure
Python.  Benchmark it (cpu and memory) and then try the other approaches
(Cython, Boost, hand coded, SWIG) and see how they compare.  Something
like a brute force Suduko solver would let you have a few
classes/objects but not be too much code.

Roger
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iEYEARECAAYFAkoHy/QACgkQmOOfHg372QTxywCgrJPcHLQ5BzD8O29nSAW+I5xo
juYAnjMP0xqn/TzC5mrTCqBT3ZnIQo24
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From ldo at geek-central.gen.new_zealand  Mon May 11 02:58:48 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 11 May 2009 18:58:48 +1200
Subject: OT (humor): 'import antigravity' in action!
References: <mailman.5354.1241924166.11746.python-list@python.org>
Message-ID: <gu8ib8$u1k$3@lust.ihug.co.nz>

In message <mailman.5354.1241924166.11746.python-list at python.org>, Shawn 
Milochik wrote:

> I know you've probably all seen this 50 times, but just in case:
> http://xkcd.com/353/

Ironically, that's no longer valid in Python 3.0.



From clp2 at rebertia.com  Mon May 11 03:10:32 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 11 May 2009 00:10:32 -0700
Subject: OT (humor): 'import antigravity' in action!
In-Reply-To: <gu8ib8$u1k$3@lust.ihug.co.nz>
References: <mailman.5354.1241924166.11746.python-list@python.org>
	<gu8ib8$u1k$3@lust.ihug.co.nz>
Message-ID: <50697b2c0905110010j66a4ac11t9836417c23041a4b@mail.gmail.com>

On Sun, May 10, 2009 at 11:58 PM, Lawrence D'Oliveiro
<ldo at geek-central.gen.new_zealand> wrote:
> In message <mailman.5354.1241924166.11746.python-list at python.org>, Shawn
> Milochik wrote:
>
>> I know you've probably all seen this 50 times, but just in case:
>> http://xkcd.com/353/
>
> Ironically, that's no longer valid in Python 3.0.

But only by a pair of parens! Still beats the pants off Java.

Cheers,
Chris
-- 
http://blog.rebertia.com


From ldo at geek-central.gen.new_zealand  Mon May 11 03:11:00 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 11 May 2009 19:11 +1200
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
References: <mailman.5282.1241783298.11746.python-list@python.org>
Message-ID: <gu8j26$up8$1@lust.ihug.co.nz>

In message <mailman.5282.1241783298.11746.python-list at python.org>, Geoff 
Gardiner wrote:

> How do I assure myself of the integrity of a Python installation
> acquired using apt-get install on Debian and Ubuntu?

    apt-get install debsums
    man debsums




From chris.mahan at gmail.com  Mon May 11 03:23:29 2009
From: chris.mahan at gmail.com (Christopher Mahan)
Date: Mon, 11 May 2009 00:23:29 -0700
Subject: HTTP HEAD and docxmlrpcserver
Message-ID: <4d9b53db0905110023r6d92d0dcx4135603713295a02@mail.gmail.com>

I have a docxmlrpcserver install (kissws.com) that's returning HTTP code 501
when the client makes a HEAD request.

Any idea as to whether that's by design?

Thanks in advance.


Chris Mahan
chris.mahan at gmail.com
gv (818) 671-1709
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From namekuseijin at gmail.com  Mon May 11 03:56:12 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Mon, 11 May 2009 00:56:12 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com> 
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com> 
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com> 
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com> 
	<gu4fgi$1222$1@adenine.netfront.net>
	<24381226-a7a0-4fbb-b928-644609e5909b@w31g2000prd.googlegroups.com>
	<gu79ud$2al5$1@adenine.netfront.net>
	<2abd8518-fbb1-4a84-b84d-4e1e4a74aa3b@s1g2000prd.googlegroups.com>
Message-ID: <9f3d6fc6-8082-497a-bcc2-2514be39f9e3@x6g2000vbg.googlegroups.com>

On May 10, 7:18?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 10, 12:40?pm, namekuseijin <namekuseijin.nos... at gmail.com>
> wrote:
> theoretical argument like, "everything reduces to a function so it
> doesn't matter what syntax you use," yet people in the real world are
> out there trying to find alternatives because functional languages'
> syntax sucks so bad in general.

It's not that it sucks.  More that it's pretty much non-existent.
Yes, many people are very sensitive to such issue -- that is, that
they feel lost without common constructs permeating the code rather
than the fluid and recursive nature of functional programming and its
never-ending flow of userland function calls.

OTOH, I can't help but think part of it has to do with plain text in
your face rather than lots of colorful keywords in your fav editor.

> The reason the OP was asking about separating pure code from impure
> was to see if some subset of Python could be used as a pure functional
> language, that way they could employ Python and its already-much-
> better-than-Haskell's syntax as a pedagogical replacement for Haskell.

ah, probably.  Python has replaced Scheme in certain pedagogical
circles too.  Scheme was considered a great tool for teaching basic
compsci concepts *precisely* for it's lack of syntax so that students
could concentrate on the concepts and problems at hand rather than
fight against the compiler or have to learn a huge tome of libs and
frameworks before even outputting a single "hello world".

But Java was all the rage in the past few years at introductory
compsci and at least no doubt Python is a blessing compared to that.
Though it too is not without a lot of quirks itself...

> I am sure there are many people who think that even "f a b" is cryptic
> compared to "f(a,b)", but if that's the only issue it wouldn't be that
> big of a deal. ?It's not the only issue. ?When a language requires you
> to read and write stuff like "map :: (x -> y) -> f x -> f y"

This is a type annotation and there's nothing similar in Python given
it's typeless nature.  Should I call Python's non-existent type
annotations horrible too?

>"f s@ (x:xs) = x:s" then it's going to turn a lot of people off.

what about

@foobize
def dingle( n, *boz ): return boz[n:-2]

?  Sounds perfectly cryptic for the non-initiated too.


From nick at craig-wood.com  Mon May 11 04:30:03 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 11 May 2009 03:30:03 -0500
Subject: Learning C++ for Python Development
References: <5d97efc2-af41-4dd6-a243-50f85d54746c@s16g2000vbp.googlegroups.com>
Message-ID: <slrnh0fn8r.qcl.nick@irishsea.home.craig-wood.com>

joshua.pearce at gmail.com <joshua.pearce at gmail.com> wrote:
>  I am a recovering C# web developer who has recently picked up Django
>  and I'm loving it.
> 
>  I would eventually like to get a job as a Django/Python developer. It
>  seems that many Python jobs require that you also be a C++ developer.
>  While I want to remain primarily a web developer, I don't want be
>  stuck doing CRUD applications, so I would like to learn C++ for Python
>  development. I have taken two basic programming courses in straight up
>  C++, no STL, Boost or anything like that, but I do have a very basic
>  knowledge of the language.
> 
>  Can you folks suggest some Python packages which use C++ and are
>  relevant for web development, so I can dig through the source and
>  contribute in some way?
> 
>  Or, just give me some general advice on learning C++ for Python?

I'm guessing that people who advertise for C++ and Python are
embedding python into C++ not extending python with C++.

Having done both things, I can say that embedding python into C++ is
not too much trouble, but that it is slightly easier to extend python
with C rather than C++ since the python executable is a C program not
a C++ program.

I'd start by reading this

  http://docs.python.org/extending/

And try some of the examples.

I'd also read all about ctypes

  http://docs.python.org/library/ctypes.html

Which has saved me a huge amount of time in both the embedding and
extending cases!  One of the apps I've worked on is C++ but can have
"drivers" written in python run by an embedded python interpreter.
These drivers can call back into the C++ code, and the C++ can call
into the drivers.  That is done with a amount of C++ to load the
drivers and to export the C++ symbols into the python code at runtime
with ctypes.  A bit of C++ implements the shims for the callbacks from
python -> C++ (which are exported by ctypes).

>  P.S. I want to develop on Linux not Windows.

Should be just the same on both.  Once you've made your setup.py (for
extending python) the build process will work on all supported
architectures.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From david.geldreich at free.fr  Mon May 11 04:49:15 2009
From: david.geldreich at free.fr (r2d3)
Date: Mon, 11 May 2009 01:49:15 -0700 (PDT)
Subject: Compiling Python on Windows : how to deal with modules ?
Message-ID: <b83cb71b-791d-473a-b312-f7643a798f19@s28g2000vbp.googlegroups.com>

Hi Pythoners,

I am using Python embedded in my application (OSX,Windows) and I need
to distribute Python as part of my application.

On OSX, no problem, I got a self contained framework (with dynamic
library and all the modules).

On Windows, I manage to compile Python 2.6.2 with PCbuild\build.bat
and I get python26.dll/python26_d.dll.

But the readme gives no clue about how to deal with the module
"compilation"/installation.

So how do I "compile"/package all the modules that comes with Python
source distribution on Windows ? To embed it in my distribution, I
just copy the whole Modules tree (only pyc/pyo/pyd files ?) ? and set
the right sys.path from my C code (using PySys_SetPath) ?

Thanks in advance.


From gh at ghaering.de  Mon May 11 05:11:46 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Mon, 11 May 2009 11:11:46 +0200
Subject: Learning C++ for Python Development
In-Reply-To: <5d97efc2-af41-4dd6-a243-50f85d54746c@s16g2000vbp.googlegroups.com>
References: <5d97efc2-af41-4dd6-a243-50f85d54746c@s16g2000vbp.googlegroups.com>
Message-ID: <gu8q4i$6tc$1@ger.gmane.org>

joshua.pearce at gmail.com wrote:
> I am a recovering C# web developer who has recently picked up Django
> and I'm loving it.
> 
> I would eventually like to get a job as a Django/Python developer. It
> seems that many Python jobs require that you also be a C++ developer.

I've seen the C++/Python combination in job descriptions, too. ISTM that
these are about systems that are written in C++ and then scripted in
Python. For speeding up Python applications.

> While I want to remain primarily a web developer, I don't want be
> stuck doing CRUD applications, so I would like to learn C++ for Python
> development. 

In the web development field, the probability for doing custom C/C++
development is very low in my experience.

> I have taken two basic programming courses in straight up
> C++, no STL, Boost or anything like that, but I do have a very basic
> knowledge of the language.

Learning progamming languages never hurts, but I'd recommend you learn C
instead, perhaps by using the Python C API (writing small extension
modules).

There are not so many Python extensions written in C++, most are written
in C. C++ usually doesn't buy you enough to warrant using it instead of
C here.

So my advice: go with C. Or learn something more relevant to web
programming. Like improve your JavaScript skills ;-)

> [...]

-- Gerhard



From wojtulek at gmail.com  Mon May 11 05:21:11 2009
From: wojtulek at gmail.com (w.p.)
Date: Mon, 11 May 2009 02:21:11 -0700 (PDT)
Subject: cx_freeze - cannot get importer instance
Message-ID: <8f393e1a-0413-4817-b07c-dc630dc56798@x6g2000vbg.googlegroups.com>

Hello!

My application is frozen with cx_freeze. Everything is ok, but on one
PC with Windows 2003 64bit i got cx_freeze fatal error "cannot get
importer instance". I don't use zipimport in my python code and i
don't know why i get this error :/
Any idea? How test this error?

w.p.


From nick at craig-wood.com  Mon May 11 05:30:04 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 11 May 2009 04:30:04 -0500
Subject: Q's on my first python script
References: <gu6im5$1hi$1@reader1.panix.com>
Message-ID: <slrnh0fpu5.qcl.nick@irishsea.home.craig-wood.com>

kj <socyl at 987jk.com.invalid> wrote:
> 
>  Below is my very firs python script.
> 
>  This was just a learning exercise; the script doesn't do anything
>  terribly exciting: for an argument of the form YYMMDD (year, month,
>  day) it prints out the corresponding string YYMMDDW, where W is a
>  one-letter abbreviation for the day of the week.  E.g.
> 
>  % wd 090511
>  090511M
> 
>  The script runs OK, but I can still see a few areas of improvement,
>  for which I could use your advice.
> 
>  1. The name of the BadArgument exception class defined in the script
>     does not seem to me sufficiently specific.  If one were to import
>     the script in order to reuse its wkday_abbrev function, I'd like
>     this exception's name to be more unequivocally tied to this
>     script.  What I'm looking for is something like a "namespace"
>     for this script.  What's the pythonic way to construct a namespace?
> 
>  2. In some python modules I've seen the idiom
> 
>     if __name__ == "__main__":
>        # run some tests here
> 
>     I'd like to set up tests for this script, mostly to ensure that
>     it handles the error cases properly, but I'm alread using the
>     idiom above to actually run the script under normal operation.
>     What's the typical python idiom for running tests on a *script*
>     (as opposed to a module that is normally not supposed to be run
>     directly)?
> 
>  3. Still on the subject of testing, how does one capture in a
>     variable the output that would normally have gone to stdout or
>     stderr?
> 
>  4. What's the python way to emit warnings?  (The script below should
>     warn the user that arguments after the first one are ignored.)
> 
>  5. The variable wd is meant to be "global" to the script.  In other
>     languages I've programmed in I've seen some typographic convention
>     used for the name of such variables (e.g. all caps) to signal
>     this widened scope.  Does python have such a convention?
> 
>  Any comments/suggestions on these questions, or anything else about
>  the script, would be much appreciated.

To be honest, my first try at this script probably would have looked
quite like yours!  Once it was working I'd have tidied it as below.

  * Put into a class to stop spread of globals
  * WD made class member and upper case
  * 4 space indents as per PEP8
  * remove lamda as it isn't needed
  * only try:/except: the minimum possible amount of code
  * new name for exception


from optparse import OptionParser
import re
import datetime
import sys

class BadDateString(Exception):
    """Malformed date string"""

class Main(object):
    """Script to implement weekday"""
    WD = ("M", "T", "W", "H", "F", "S", "U")
    def wkday_abbrev(self, date_string):
        mm = re.match("(\d{2})(\d{2})(\d{2})\Z", date_string)
        if not mm:
            raise BadDateString("Couldn't match date string from %r" % date_string)
        y, m, d = map(int, mm.groups())
        if y < 38:
            y = y + 1900
        else:
            y = y + 2000
        try:
            return self.WD[datetime.datetime(y, m, d).weekday()]
        except ValueError:
            raise BadDateString("Bad date in %r" % date_string)

    def __init__(self):
        usage = '''Usage: %prog [options] YYMMDD
           %prog -h|--help
'''
        parser = OptionParser(usage=usage)
        parser.add_option("-n", "--no-newline", dest="nonl",
                          action="store_true", help="omit newline in output")
        (options, args) = parser.parse_args();
        try:
            weekday = self.wkday_abbrev(args[0])
        except BadDateString, e:
            print usage
            print e
            sys.exit(1)
        sys.stdout.write("%s%s" % (args[0], weekday))
        if not options.nonl:
            print

if __name__ == "__main__":
    Main()

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nick at craig-wood.com  Mon May 11 05:30:04 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 11 May 2009 04:30:04 -0500
Subject: how GNU stow is complementary rather than alternative to distutils
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<4A059639.7040505@v.loewis.de>
	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
	<4A070C58.4070003@v.loewis.de>
	<mailman.5391.1241978886.11746.python-list@python.org>
Message-ID: <slrnh0fr9i.qcl.nick@irishsea.home.craig-wood.com>

Zooko Wilcox-O'Hearn <zooko at zooko.com> wrote:
>  On May 10, 2009, at 11:18 AM, Martin v. L?wis wrote:
> 
> > If GNU stow solves all your problems, why do you want to use  
> > easy_install in the first place?
> 
>  That's a good question.  The answer is that there are two separate  
>  jobs: building executables and putting them in a directory structure  
>  of the appropriate shape for your system is one job, and installing  
>  or uninstalling that tree into your system is another.  GNU stow does  
>  only the latter.
> 
>  The input to GNU stow is a set of executables, library files, etc.,  
>  in a directory tree that is of the right shape for your system.  For  
>  example, if you are on a Linux system, then your scripts all need to  
>  be in $prefix/bin/, your shared libs should be in $prefix/lib, your  
>  Python packages ought to be in $prefix/lib/python$x.$y/site- 
>  packages/, etc.  GNU stow is blissfully ignorant about all issues of  
>  building binaries, and choosing where to place files, etc. -- that's  
>  the job of the build system of the package, e.g. the "./configure -- 
>  prefix=foo && make && make install" for most C packages, or the  
>  "python ./setup.py install --prefix=foo" for Python packages using  
>  distutils (footnote 1).
> 
>  Once GNU stow has the well-shaped directory which is the output of  
>  the build process, then it follows a very dumb, completely reversible  
>  (uninstallable) process of symlinking those files into the system  
>  directory structure.

Once you've got that well formed directory structure it is very easy
to make it into a package (eg deb or rpm) so that idea is useful in
general for package managers, not just stow.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nick at craig-wood.com  Mon May 11 05:30:04 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 11 May 2009 04:30:04 -0500
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
	<mailman.5400.1242000728.11746.python-list@python.org>
Message-ID: <slrnh0fqu4.qcl.nick@irishsea.home.craig-wood.com>

Rhodri James <rhodri at wildebst.demon.co.uk> wrote:
>  On Sun, 10 May 2009 08:32:23 +0100, Tobias Weber <towb at gmx.net> wrote:
> 
> > In article <m2bpq2ngup.fsf at googlemail.com>,
> >  Arnaud Delobelle <arnodel at googlemail.com> wrote:
> >
> >> A simple Alt-Q will reformat everything nicely.
> >
> > Now that's something. Thanks!
> >
> > (still not gonna use software that doesn't let me type # because it's
> > alt+3 on a UK layout; having to re-learn or configure that is just sick)
> 
>  What on earth are you talking about?  '#' has its own key on a UK layout
>  (shared with '~', but you know what I mean), just to the left of the
>  RETURN key.  Emacs is my editor of choice, and I've never once come
>  across anything like this.

You probably haven't used MAC OS X then!  I vnc to a mac and use emacs
and I just can't type a #.  "Ctrl-Q 43 Return" is my best effort!

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From bruno.42.desthuilliers at websiteburo.invalid  Mon May 11 05:40:03 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 11 May 2009 11:40:03 +0200
Subject: Code - what could be done better?
In-Reply-To: <gu3j48$cig$1@news-cedar.fernuni-hagen.de>
References: <gu3j48$cig$1@news-cedar.fernuni-hagen.de>
Message-ID: <4a07f273$0$29638$426a74cc@news.free.fr>

Florian Wollenschein a ?crit :
> Hi all,
> 
> here's the main code of thc, my txt to html converter. Since I'm a 
> beginner it is far, far, faaaaaaar away from perfect or even good :-)
> What could be done better?
> 
(snip code)

1/ decouple the text => html conversion part from your (or any other) GUI

2/ decouple the text => html conversion part from files handling (hint: 
given your code, any object having a 'write' method should do - IOW, the 
conversion code just a need an object with a "write(somestring)" method 
as argument, eventually defaulting to sys.stdout.

3/ write tags in lowercase, and get rid from the 'bgcolor' attribute in 
<body>

4/ or even better, use a templating system, to avoid hardcoding html in 
your code

Also an FWIW, there are quite a few 'simple markup' text format 
(textile, markdown, ReST, various wiki idioms etc). You may want to be 
able to use them too.

My 2 cents.




From smattehulah at gmail.com  Mon May 11 06:18:25 2009
From: smattehulah at gmail.com (smattehulah at gmail.com)
Date: Mon, 11 May 2009 03:18:25 -0700 (PDT)
Subject: Germany will provide project-specific aid to  pakistan
Message-ID: <c2011d68-13ee-4fe8-8689-b24882559f5f@k9g2000pra.googlegroups.com>

Germany will provide project-specific aid to the tune of 115 million
euro to Pakistan for next two years.
for more details visit www.empiresnews.blogspot.com


From p.f.moore at gmail.com  Mon May 11 06:56:57 2009
From: p.f.moore at gmail.com (Paul Moore)
Date: Mon, 11 May 2009 03:56:57 -0700 (PDT)
Subject: Tutorial or example use for python-graph library
References: <030fcef4-2bf5-4194-97f2-78ce95ca4ef5@v17g2000vbb.googlegroups.com>
	<BZidnUU6s6Y31ZnXnZ2dnUVZ_ridnZ2d@pdx.net>
Message-ID: <5e68ac4d-676b-4fad-ad04-b6335e1decbe@n21g2000vba.googlegroups.com>

On May 8, 4:03?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> Paul Moore wrote:
> > I have just discovered the python-graph library. I've been interested
> > in graph algorithms for a long time, so I'd like to give this a try.
> > But there seems to be very little in the way of examples, or tutorial
> > documentation available. There's the API documentation, but that's not
> > really narrative form. And there are some examples in the
> > distribution, but these seem to be essentially artificial examples,
> > rather than real-world code (and they don't have much in the way of
> > documentation!)
>
> > Are there any reasonably-sized tutorials, or examples of common real-
> > world code, using this package? My google-fu wasn't strong enough to
> > find anything directly :-(
>
> Try writing one yourself, as you are learning the interface. ?The
> package authors will love it, and will probably be overjoyed to
> help you as you stumble.

You're probably right. Some of the concepts (hypergraphs, for example)
are new to me, and I guess I was hoping for some sample code to start
me off understanding what they might be useful for. But I'll go the
other route and search around for some of the theory first and see how
I might apply it, and then try building code from that.

Paul


From p.f.moore at gmail.com  Mon May 11 06:58:40 2009
From: p.f.moore at gmail.com (Paul Moore)
Date: Mon, 11 May 2009 03:58:40 -0700 (PDT)
Subject: Tutorial or example use for python-graph library
References: <030fcef4-2bf5-4194-97f2-78ce95ca4ef5@v17g2000vbb.googlegroups.com>
	<8f032f4b-ae7a-45a0-baeb-82005229be22@n4g2000vba.googlegroups.com>
Message-ID: <b2d2731a-b3fa-42d9-8db7-f93fbfa22363@n8g2000vbb.googlegroups.com>

On May 8, 3:19?pm, "(e.g. emre)" <emregu... at gmail.com> wrote:

> you might want to check networkx as well, it is considerably well
> documented:http://networkx.lanl.gov/

Interesting, I hadn't seen that before. I'll certainly check it out!
Thanks,
Paul


From kalman_g at msn.com  Mon May 11 07:04:00 2009
From: kalman_g at msn.com (GKalman)
Date: Mon, 11 May 2009 04:04:00 -0700 (PDT)
Subject: Importing from a module which contains more than one Class...
In-Reply-To: <c2279eb3-1204-4830-8459-61d2b00b669b@f1g2000prb.googlegroups.com>
References: <23476815.post@talk.nabble.com>
	<c2279eb3-1204-4830-8459-61d2b00b669b@f1g2000prb.googlegroups.com>
Message-ID: <23481160.post@talk.nabble.com>




alex23 wrote:
> 
> GKalman <kalma... at msn.com> wrote:
>> from MyClass import *
>> from MyOtherClass import * ? ? # error msg: no such module!
>>
>> As I mentioned above, ?the code for MyClass & MyOtherClass is in the same
>> file . This program only works with a single Class in a file. That is
>> when
>> the File name is the SAME as the Class name.
>>
>> How to import from a File which contains more than one (unrelated)
>> Classes?
> 
> You seem to have misunderstood how 'import' works, I strongly
> recommend re-reading the tutorial section:
> http://docs.python.org/tutorial/modules.html
> 
> Basically, the import statement has two forms:
> 
>    1. from <module> import <contents>
>    2. import <module>
> 
> So your example of 'from <classname> import *' just doesn't make a lot
> of sense within Python.
> 
> If MyClass.py contains two classes, MyClass and MyOtherClass, you
> should be able to import them with:
> 
>    from MyClass import MyClass, MyOtherClass
> 
> However, you _should_ be already getting _everything_ MyClass.py
> contains as you're using the grab-all asterisk. Could you open a
> python shell in your Module_Class folder, type 'from MyClass import
> MyClass, MyOtherClass', and past whatever traceback you get here?
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
> 

Alex! 
Looks like I did misunderstand how 'import' works. Thanks for your help, now
it works OK.
-- 
View this message in context: http://www.nabble.com/Importing-from-a-module-which-contains-more-than-one-Class...-tp23476815p23481160.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From anuraguniyal at yahoo.com  Mon May 11 08:14:18 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Mon, 11 May 2009 05:14:18 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl> 
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com> 
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl> 
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
	<slrnh0d0gd.mi5.nick@irishsea.home.craig-wood.com>
	<05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>
	<mailman.5406.1242020840.11746.python-list@python.org>
Message-ID: <08d5f526-aa96-4917-8377-2837ba2fc089@g31g2000pra.googlegroups.com>

On May 11, 10:47?am, Terry Reedy <tjre... at udel.edu> wrote:
> anuraguni... at yahoo.com wrote:
> > so unicode(obj) calls __unicode__ on that object
>
> It will look for the existence of type(ob).__unicode__ ...
>
> ?> and if it isn't there __repr__ is used
>
> According to the below, type(ob).__str__ is tried first.
>
> > __repr__ of list by default return a str even if __repr__ of element
> > is unicode
>
> ?From the fine library manual, built-in functions section:
> (I reccommend using it, along with interactive experiments.)
>
> "repr( object)
> Return a string ..."
>
> "str( [object])
> Return a string ..."
>
> "unicode( [object[, encoding [, errors]]])
>
> Return the Unicode string version of object using one of the following
> modes:
>
> If encoding and/or errors are given, ...
>
> If no optional parameters are given, unicode() will mimic the behaviour
> of str() except that it returns Unicode strings instead of 8-bit
> strings. More precisely, if object is a Unicode string or subclass it
> will return that Unicode string without any additional decoding applied.
>
> For objects which provide a __unicode__() method, it will call this
> method without arguments to create a Unicode string. For all other
> objects, the 8-bit string version or representation is requested and
> then converted to a Unicode string using the codec for the default
> encoding in 'strict' mode.
> "
>
> 'unicode(somelist)' has no optional parameters, so skip to third
> paragraph. ?Somelist is not a unicode instance, so skip to the last
> paragraph. ?If you do dir(list) I presume you will *not* see
> '__unicode__' listed. ?So skip to the last sentence.
> unicode(somelist) == str(somelist).decode(default,'strict').
>
> I do not believe str() and repr() are specifically documented for
> builtin classes other than the general description, but you can figure
> that str(collection) or repr(collection) will call str or repr on the
> members of the collection in order to return a str, as the doc says.
Thanks for the explanation.

> (Details are available by experiment.) ?Str(uni_string) encodes with the
> default encoding, which seems to be 'ascii' in 2.x. ?I am sure it uses
> 'strict' errors.
>
> I would agree that str(some_unicode) could be better documented, like
> unicode(some_str) is.
>
> > so my only solution looks like to use my own list class everywhere i
> > use list
> > class mylist(list):
> > ? ? def __unicode__(self):
> > ? ? ? ? return u"["+u''.join(map(unicode,self))+u"]"
>
> Or write a function and use that instead, or, if and when you can,
> switch to 3.x where str and repr accept and produce unicode.
>
> tjr



From giuott at gmail.com  Mon May 11 08:26:49 2009
From: giuott at gmail.com (Giuseppe Ottaviano)
Date: Mon, 11 May 2009 14:26:49 +0200
Subject: [Python-Dev] how GNU stow is complementary rather than
	alternative to distutils
In-Reply-To: <B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
References: <49D4DA72.60401@v.loewis.de>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB22B5.3040507@simplistix.co.uk>	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>	<4A0590C4.1020904@v.loewis.de>	<20090509143829.17F293A4080@sparrow.telecommunity.com>	<4A059639.7040505@v.loewis.de>	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
	<4A070C58.4070003@v.loewis.de>
	<B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
Message-ID: <6AA82018-2DCA-4F58-BEF9-28D021553247@gmail.com>

Talking of stow, I take advantage of this thread to do some shameless  
advertising :)
Recently I uploaded to PyPI a software of mine, BPT [1], which does  
the same symlinking trick of stow, but it is written in Python (and  
with a simple api) and, more importantly, it allows with another trick  
the relocation of the installation directory (it creates a semi- 
isolated environment, similar to virtualenv).
I find it very convenient when I have to switch between several  
versions of the same packages (for example during development), or I  
have to deploy on the same machine software that needs different  
versions of the dependencies.

I am planning to write an integration layer with buildout and  
easy_install. It should be very easy, since BPT can handle directly  
tarballs (and directories, in trunk) which contain a setup.py.

HTH,
Giuseppe

[1] http://pypi.python.org/pypi/bpt
P.S. I was not aware of stow, I'll add it to the references and see if  
there are any features that I can steal




From michele.simionato at gmail.com  Mon May 11 08:37:59 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 11 May 2009 05:37:59 -0700 (PDT)
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
Message-ID: <bf94f564-8531-47b0-9e11-a7813eeddd5c@n4g2000vba.googlegroups.com>

On May 8, 5:33?pm, Mikael Olofsson <mik... at isy.liu.se> wrote:

> ?>>> class test_decorator(object):
> ... ? ? def __init__(self,func):
> ... ? ? ? ? self._func = func
> ... ? ? def __call__(self, *args):
> ... ? ? ? ? print 'Decorator:', args
> ... ? ? ? ? self._func(*args)

Or you could use the decorator module (http://pypi.python.org/pypi/
decorator):

from decorator import decorator

@decorator
def test_decorator(func, *args, **kw):
   print 'Decorator:', args
   return func(*args)


From aahz at pythoncraft.com  Mon May 11 08:46:18 2009
From: aahz at pythoncraft.com (Aahz)
Date: Mon, 11 May 2009 05:46:18 -0700
Subject: Switchover: mail.python.org
Message-ID: <20090511124618.GA19400@panix.com>

On Monday 2009-05-11, mail.python.org will be switched to another machine
starting roughly at 14:00 UTC.  This should be invisible (expected
downtime is less than ten minutes).
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From bruno.42.desthuilliers at websiteburo.invalid  Mon May 11 09:12:12 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 11 May 2009 15:12:12 +0200
Subject: Why there is a parameter named "self" for classmethod function?
In-Reply-To: <mailman.5206.1241671190.11746.python-list@python.org>
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>	<4A024F18.9080407@kbsymanzik.org>
	<mailman.5206.1241671190.11746.python-list@python.org>
Message-ID: <4a08242b$0$24000$426a34cc@news.free.fr>

Terry Reedy a ?crit :
> Kurt Symanzik wrote:
> 
>>
>> But you might consider decorating the method as a static method 
>> instead since in your example you are not using the parameter at all.  
>> A static method would not require a parameter.
>>
>> @staticmethod
>> def print_hello():
>>     print "hello"
> 
> Functions that refer to neither the class nor an instance thereof can 
> usually be moved outside the class altogether.  Python is not Java.

Indeed. But there are a couple uses for staticmethods - one of them 
being polymorphic dispatch on the receiver object. And yes, I know, 
modules are objects too, but this is not always an option (legacy code, 
integration with a framework etc).



From eckhardt at satorlaser.com  Mon May 11 09:33:03 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 11 May 2009 15:33:03 +0200
Subject: Skipping unit tests
Message-ID: <f1mld6-v1j.ln1@satorlaser.homedns.org>

Hi!

We have a few tests for some module here. These tests are under development
and applied to older versions (with less features) of the module, too. That
means that if I have module version 42, tests A and B can not possibly
work. I don't want to have test failures but I also don't want to fork the
test suite, so how do I get the tests to behave like Python's test suite,
which also skips some "expected failures".

Thank you!

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From justin.donato at gmail.com  Mon May 11 09:51:42 2009
From: justin.donato at gmail.com (justind)
Date: Mon, 11 May 2009 06:51:42 -0700 (PDT)
Subject: win32 How to make sure a file is completely written?
Message-ID: <6b33c5b3-ae51-4245-a3d5-28d48b76dd07@j12g2000vbl.googlegroups.com>

Hello,

I'm using http://code.activestate.com/recipes/156178/ to watch a
folder in windows. It's working perfectly, but sometimes when I try to
open the file immediately after receiving the event, it's not ready to
be opened--if I try to open it with PIL I get "IOError: cannot
identify image file" and if I try it with a text file, it's empty.
This doesn't happen all the time, just occasionally. I think the
problem is that the file isn't completely written because if I make
the script sleep for a second, it works every time. But that doesn't
seem very elegant or robust.

What's the proper way to make sure the file is ready to be read?

I'm just passing the file names from the above recipe to a function.
Something like

def handler(files):
    for file in files:
        im = Image.open(file)

Thanks




From mabdelkader at gmail.com  Mon May 11 10:02:21 2009
From: mabdelkader at gmail.com (ma)
Date: Mon, 11 May 2009 10:02:21 -0400
Subject: win32 How to make sure a file is completely written?
In-Reply-To: <6b33c5b3-ae51-4245-a3d5-28d48b76dd07@j12g2000vbl.googlegroups.com>
References: <6b33c5b3-ae51-4245-a3d5-28d48b76dd07@j12g2000vbl.googlegroups.com>
Message-ID: <148918f0905110702q13f514a8k7e884b5a152d1394@mail.gmail.com>

You have to wait until IO is ready. In Unix, we accomplish this with
fcntl and the default signal SIGIO, I am not sure how you would do
this in Windows.


On Mon, May 11, 2009 at 9:51 AM, justind <justin.donato at gmail.com> wrote:
> Hello,
>
> I'm using http://code.activestate.com/recipes/156178/ to watch a
> folder in windows. It's working perfectly, but sometimes when I try to
> open the file immediately after receiving the event, it's not ready to
> be opened--if I try to open it with PIL I get "IOError: cannot
> identify image file" and if I try it with a text file, it's empty.
> This doesn't happen all the time, just occasionally. I think the
> problem is that the file isn't completely written because if I make
> the script sleep for a second, it works every time. But that doesn't
> seem very elegant or robust.
>
> What's the proper way to make sure the file is ready to be read?
>
> I'm just passing the file names from the above recipe to a function.
> Something like
>
> def handler(files):
> ? ?for file in files:
> ? ? ? ?im = Image.open(file)
>
> Thanks
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From mail at timgolden.me.uk  Mon May 11 10:03:34 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 11 May 2009 15:03:34 +0100
Subject: win32 How to make sure a file is completely written?
In-Reply-To: <6b33c5b3-ae51-4245-a3d5-28d48b76dd07@j12g2000vbl.googlegroups.com>
References: <6b33c5b3-ae51-4245-a3d5-28d48b76dd07@j12g2000vbl.googlegroups.com>
Message-ID: <4A083036.90609@timgolden.me.uk>

justind wrote:
> Hello,
> 
> I'm using http://code.activestate.com/recipes/156178/ to watch a
> folder in windows. 

Wow, that takes me back. There's a bit more info (and a different
technique) here if you're interested:

  http://timgolden.me.uk/python/win32_how_do_i/watch_directory_for_changes.html

But to come back your question...

> It's working perfectly, but sometimes when I try to
> open the file immediately after receiving the event, it's not ready to
> be opened--if I try to open it with PIL I get "IOError: cannot
> identify image file" and if I try it with a text file, it's empty.
> This doesn't happen all the time, just occasionally. I think the
> problem is that the file isn't completely written because if I make
> the script sleep for a second, it works every time. But that doesn't
> seem very elegant or robust.
> 
> What's the proper way to make sure the file is ready to be read?

I don't believe there's an easy answer to this question. From the
filesystem's point of view some process creates a file. So it
tells you that a file has been created. The filesystem has no 
knowledge of when a file is "complete". It could -- altho' it
doesn't -- fire an event when a handle on that file is closed,
but even that wouldn't tell you much: you'd have to be able
to distinguish between the handle which is behind the data
you're looking for and a handle from a virus scanner which is
checking the new file for malware.


To add difficulty, when Windows initiates a file copy (as opposed
to creating a new file) it immediately creates the file at its
full size and then copies data in. Which makes some sense as it
should avoid some element of fragmentation etc. But it removes
one of your options: noting the size of an original file and
comparing it with the size of a copy.

So I think you're out of luck and you're going to have to
put a try-except loop in place.

TJG


From mikael at isy.liu.se  Mon May 11 10:06:11 2009
From: mikael at isy.liu.se (Mikael Olofsson)
Date: Mon, 11 May 2009 16:06:11 +0200
Subject: Decorating methods - where do my arguments go?
In-Reply-To: <gu1n81$ir7$03$1@news.t-online.com>
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
Message-ID: <gu8u7s$l1$1@news.lysator.liu.se>

Peter Otten wrote:
> You have to turn your decorator into a descriptor by providing a __get__() 
> method. A primitive example:
> 
> class test_decorator(object):
>     def __init__(self,func):
>         self._func = func
>     def __call__(self, *args):
>         print 'Decorator:', args
>         self._func(self.inst, *args)
>     def __get__(self, inst, cls):
>         self.inst = inst
>         return self

Thanks! Works perfectly for methods, as far as I can see. That's 
perfectly OK, since that is what I was asking for. What I failed to 
include in my original post is that I intend to use the decorator for 
functions as well. The above fails for functions on the second row of 
__call__ with

     AttributeError: 'test_decorator' object has no attribute 'inst'

It seems to me like __get__ is not called when decorating a function. I 
guess there's no reasonable value for inst in that case. It might be the 
function itself, but it doesn't make sense to call the function with 
itself as its first argument, when it isn't supposed to be called that way.

George Sakkis decorator function solution seems to work equally well for 
functions and methods. However, I prefer the cleaner encapsulation given 
by a class. Based on those observations, I think I will use the 
following approach:

 >>> class test_decorator(object):
...     _inst = None
...     def __init__(self,func):
...         self._func = func
...     def __call__(self, *args):
...         print 'Decorator:', args
...         if self._inst is None:
...             print 'We seem to be decorating a function.'
...             self._func(*args)
...         else:
...             print 'We seem to be decorating a method.'
...             self._func(self._inst,*args)
...     def __get__(self, inst, cls):
...         self._inst = inst
...         return self
...
 >>>
 >>> @test_decorator
... def func(*args):
...     print 'Function: ', args
...
 >>>
 >>> func(1,2,3)
Decorator: (1, 2, 3)
We seem to be decorating a function.
Function:  (1, 2, 3)
 >>>
 >>> class cls(object):
...     @test_decorator3
...     def meth(self,*args):
...         print 'Method:   ', args
...
 >>>
 >>> cls().meth(1,2,3)
Decorator: (1, 2, 3)
We seem to be decorating a method.
Method:    (1, 2, 3)

If there are any drawbacks with this approach that I fail to see, please 
enlighten me.

/MiO


From mikael at isy.liu.se  Mon May 11 10:06:26 2009
From: mikael at isy.liu.se (Mikael Olofsson)
Date: Mon, 11 May 2009 16:06:26 +0200
Subject: Decorating methods - where do my arguments go?
In-Reply-To: <b3b6788c-42ad-4c65-b999-48f420e90630@o20g2000vbh.googlegroups.com>
References: <gu167u$svk$1@news.lysator.liu.se>
	<b3b6788c-42ad-4c65-b999-48f420e90630@o20g2000vbh.googlegroups.com>
Message-ID: <gu8u8a$l1$2@news.lysator.liu.se>

George Sakkis wrote:
> Yes, just return an actual function from the decorator instead of a
> callable object:
> 
> def test_decorator2(func):
>     def wrapper(*args):
>         print 'Decorator2:', args
>         func(*args)
>     return wrapper
> 
> 
> class cls(object):
>     @test_decorator
>     def meth(self,*args):
>         print 'Method:   ', args
> 
>     @test_decorator2
>     def meth2(self,*args):
>         print 'Method2:   ', args

Thanks! This has the merit over Peter's solution that it seems to work 
for both functions and methods. However, as you can see from my answer 
to Peter, I think I will go for a class based approach anyway. Still, 
your answer helped me grasping the concepts.

/MiO


From justin.donato at gmail.com  Mon May 11 10:12:12 2009
From: justin.donato at gmail.com (justind)
Date: Mon, 11 May 2009 07:12:12 -0700 (PDT)
Subject: win32 How to make sure a file is completely written?
References: <6b33c5b3-ae51-4245-a3d5-28d48b76dd07@j12g2000vbl.googlegroups.com>
	<mailman.5418.1242050605.11746.python-list@python.org>
Message-ID: <2cd511d8-7789-4f47-9b99-616205f9794c@t10g2000vbg.googlegroups.com>

On May 11, 10:03?am, Tim Golden <m... at timgolden.me.uk> wrote:
> justind wrote:
> > Hello,
>
> > I'm usinghttp://code.activestate.com/recipes/156178/to watch a
> > folder in windows.
>
> Wow, that takes me back. There's a bit more info (and a different
> technique) here if you're interested:
>
> ?http://timgolden.me.uk/python/win32_how_do_i/watch_directory_for_chan...
>
> But to come back your question...
>
> > It's working perfectly, but sometimes when I try to
> > open the file immediately after receiving the event, it's not ready to
> > be opened--if I try to open it with PIL I get "IOError: cannot
> > identify image file" and if I try it with a text file, it's empty.
> > This doesn't happen all the time, just occasionally. I think the
> > problem is that the file isn't completely written because if I make
> > the script sleep for a second, it works every time. But that doesn't
> > seem very elegant or robust.
>
> > What's the proper way to make sure the file is ready to be read?
>
> I don't believe there's an easy answer to this question. From the
> filesystem's point of view some process creates a file. So it
> tells you that a file has been created. The filesystem has no
> knowledge of when a file is "complete". It could -- altho' it
> doesn't -- fire an event when a handle on that file is closed,
> but even that wouldn't tell you much: you'd have to be able
> to distinguish between the handle which is behind the data
> you're looking for and a handle from a virus scanner which is
> checking the new file for malware.
>
> To add difficulty, when Windows initiates a file copy (as opposed
> to creating a new file) it immediately creates the file at its
> full size and then copies data in. Which makes some sense as it
> should avoid some element of fragmentation etc. But it removes
> one of your options: noting the size of an original file and
> comparing it with the size of a copy.
>
> So I think you're out of luck and you're going to have to
> put a try-except loop in place.
>
> TJG

Thanks Guys.


From denis.papathanasiou at gmail.com  Mon May 11 10:39:14 2009
From: denis.papathanasiou at gmail.com (dpapathanasiou)
Date: Mon, 11 May 2009 07:39:14 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<12ef7b00-f0c5-4030-a353-533d93d23cdd@r3g2000vbp.googlegroups.com> 
	<794f117f-4df5-4c6c-be68-f901959b2579@y10g2000prc.googlegroups.com>
Message-ID: <d64eeab4-f07c-4f06-a70c-0c78278b2c2f@r34g2000vba.googlegroups.com>


> His problem is therefore likely to be something completely different.

You are correct.

As per the earlier advice, I switched from mod_python to mod_wsgi but
I still see the same error:

[Mon May 11 10:30:21 2009] [notice] Apache/2.2.11 (Unix) mod_wsgi/2.4
Python/2.5.2 configured -- resuming normal operations
[Mon May 11 10:30:26 2009] [error] Traceback (most recent call last):
[Mon May 11 10:30:26 2009] [error]   File "../db/items_db.py", line
38, in <lambda>
[Mon May 11 10:30:26 2009] [error]     db_object.associate(sdb_object,
(lambda primary_key, primary_data:xml_utils.parse_item_attribute
(primary_data, attribute)))
[Mon May 11 10:30:26 2009] [error]   File "../common/xml_utils.py",
line 80, in parse_item_attribute
[Mon May 11 10:30:26 2009] [error]     item_doc = minidom.parseString
(item)
[Mon May 11 10:30:26 2009] [error]   File "/usr/lib/python2.5/xml/dom/
minidom.py", line 1924, in parseString
[Mon May 11 10:30:26 2009] [error]     from xml.dom import
expatbuilder
[Mon May 11 10:30:26 2009] [error] SystemError: Parent module
'xml.dom' not loaded
[Mon May 11 10:30:26 2009] [error] Traceback (most recent call last):
[Mon May 11 10:30:26 2009] [error]   File "../db/items_db.py", line
38, in <lambda>
[Mon May 11 10:30:26 2009] [error]     db_object.associate(sdb_object,
(lambda primary_key, primary_data:xml_utils.parse_item_attribute
(primary_data, attribute)))
[Mon May 11 10:30:26 2009] [error]   File "../common/xml_utils.py",
line 80, in parse_item_attribute
[Mon May 11 10:30:26 2009] [error]     item_doc = minidom.parseString
(item)
[Mon May 11 10:30:26 2009] [error]   File "/usr/lib/python2.5/xml/dom/
minidom.py", line 1924, in parseString
[Mon May 11 10:30:26 2009] [error]     from xml.dom import
expatbuilder
[Mon May 11 10:30:26 2009] [error] SystemError: Parent module
'xml.dom' not loaded

The odd thing is that when xml_utils.py is run outside of either
apache module, xml.dom does load, and the minidom parsing works.

I'm not sure why this is happening, but the next thing I'll do is try
replacing minidom with ElementTree, and see if that has any issues
running under either apache module.


From agaskins_ng at kelleramerica.com  Mon May 11 10:53:38 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Mon, 11 May 2009 10:53:38 -0400
Subject: OOP & Abstract Classes
Message-ID: <SZWNl.16133$hX2.2435@newsfe19.iad>

Hi all,

-- Non critical info--
I am a fairly seasoned PHP developer (don't shoot, I'm changing teams!:) who 
is admittedly behind the curve with OOP. Like most who learned PHP, I 
started doing web app backend stuff, but I have moved to full blown windows 
apps in the last 6 months using Winbinder. As you may know Winbinder is 
essentially abandoned, and programming windows apps with Winbinder or even 
GTK-PHP is less than ideal. I also deal heavily in serial/rs-232 
communications which is a pain in PHP. Long story short, I'm tired of doing 
things in such a hackish manner and want to write applications that are 
cross platform (I'd like to get our production dept on linux eventually) and 
truely object oriented.
-- END non critical stuff--

So I was beginning to learn OOP for PHP, and it seemed to me that abstract 
classes were just right for my application. In my application I must 
communicate with several peices of test equipment that communicate via 
RS-232. Most use SCPI instructions, some do not and require low level 
communication.

The way I understand abstract classes is that I could have a class that has 
all my abstract methods such as 'init', 'getMeasurement', 'setPressure', 
etc... then I could use this common interface to to control my different 
pieces of hardware (after I write a library for each of them).

Is this a valid application for abstract classes? Or am I making life more 
complicated than it need be?

Now, I have read that Pythons OOP implimentation is so much better and more 
complete then PHP's, but I cant find anything about abstract classes except 
this:
http://norvig.com/python-iaq.html

...which says it doesn't exist in Python and you can only do this hack to 
make it work (and I don't particularly understand how to impliment it from 
this article).

This makes me suspect I am making things more comlicated than they need to 
be. Could someone help me understand the proper way to impliment a set 
classes/methods to deal with several peices of similar and not so similar 
hardware? Not looking for anyone to write code for me, just help 
understanding some of these OOP concepts and how they would apply to my 
situation.

Thanks!
-Adam 




From marco at sferacarta.com  Mon May 11 10:58:57 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Mon, 11 May 2009 16:58:57 +0200
Subject: Pycon Tre, grazie!
In-Reply-To: <470a7d8f-0bd0-4b17-92b2-6c703ecad2fe@o14g2000vbo.googlegroups.com>
References: <470a7d8f-0bd0-4b17-92b2-6c703ecad2fe@o14g2000vbo.googlegroups.com>
Message-ID: <S2XNl.12126$Ux.1158@tornado.fastwebnet.it>

daniele wrote:

> Si ? concluso ieri la pycon tre, ? stata molto interessante, un bel
> evento per una bella comunit?.

Sempre meglio.. anche se mi preoccupa un po' un eventuale cambio di location

> Ho visto con grande piacere, oltre all'incremento dei partecipanti,
> anche un sensibile incremento delle partecipanti!

Si'... in particolare durante il talk di Raymond :)


From eckhardt at satorlaser.com  Mon May 11 11:13:10 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 11 May 2009 17:13:10 +0200
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
Message-ID: <6trld6-98j.ln1@satorlaser.homedns.org>

Adam Gaskins wrote:
> Long story short, I'm tired of doing things in such a hackish manner
> and want to write applications that are cross platform (I'd like to
> get our production dept on linux eventually) and truely object
> oriented. 

Adam, there is one notion here that I seriously dislike: you sound as if OOP
was a goal by itself for you. The point is that OOP is a tool, not a goal.
So, if it helps you do the things you really want, go ahead and use it.
Otherwise, just don't.

> The way I understand abstract classes is that I could have a class that
> has all my abstract methods such as 'init', 'getMeasurement',
> 'setPressure', etc... then I could use this common interface to to control
> my different pieces of hardware (after I write a library for each of
> them).
> 
> Is this a valid application for abstract classes? Or am I making life more
> complicated than it need be?

I think that the term is rather "abstract base class" (ABC,
a.k.a. "interface"). Note that in Python, where you don't have to use
prototypes or declaration, you often don't do that. Instead you use "duck
typing", i.e. you simply create different classes for the different
hardware and if all of them support 'init' and 'setPressure' instances are
interchangeable ("Liskov substitution principle", IIRC) without knowing
anything about each other.

> This makes me suspect I am making things more comlicated than they need to
> be. Could someone help me understand the proper way to impliment a set
> classes/methods to deal with several peices of similar and not so similar
> hardware?

Just write a class for each piece and adhere to a common interface and
you're done.

;)

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From duncan.booth at invalid.invalid  Mon May 11 11:17:55 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 11 May 2009 15:17:55 GMT
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
	<gu8u7s$l1$1@news.lysator.liu.se>
Message-ID: <Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>

Mikael Olofsson <mikael at isy.liu.se> wrote:

> George Sakkis decorator function solution seems to work equally well 
for 
> functions and methods. However, I prefer the cleaner encapsulation 
given 
> by a class. Based on those observations, I think I will use the 
> following approach:
> 
> >>> class test_decorator(object):
> ...     _inst = None
> ...     def __init__(self,func):
> ...         self._func = func
> ...     def __call__(self, *args):
> ...         print 'Decorator:', args
> ...         if self._inst is None:
> ...             print 'We seem to be decorating a function.'
> ...             self._func(*args)
> ...         else:
> ...             print 'We seem to be decorating a method.'
> ...             self._func(self._inst,*args)
> ...     def __get__(self, inst, cls):
> ...         self._inst = inst
> ...         return self
> ...

The __get__ method should be returning a new object, NOT modifying the 
state of the decorator. As written it will break badly and unexpectedly 
in a variety of situations:

>>> inst1 = cls()
>>> inst2 = cls()
>>> inst1, inst2
(<__main__.cls object at 0x011BC470>, <__main__.cls object at 
0x011BCC90>)
>>> m = inst1.meth
>>> m()
Decorator: ()
We seem to be decorating a method.
Method:    <__main__.cls object at 0x011BC470> ()
>>> inst2.meth()
Decorator: ()
We seem to be decorating a method.
Method:    <__main__.cls object at 0x011BCC90> ()
>>> m()
Decorator: ()
We seem to be decorating a method.
Method:    <__main__.cls object at 0x011BCC90> ()

or even this:

>>> inst1.meth(inst2.meth())
Decorator: ()
We seem to be decorating a method.
Method:    <__main__.cls object at 0x011BCC90> ()
Decorator: (None,)
We seem to be decorating a method.
Method:    <__main__.cls object at 0x011BCC90> (None,)



-- 
Duncan Booth http://kupuguy.blogspot.com


From socyl at 987jk.com.invalid  Mon May 11 11:19:05 2009
From: socyl at 987jk.com.invalid (kj)
Date: Mon, 11 May 2009 15:19:05 +0000 (UTC)
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net>
Message-ID: <gu9fl8$nmh$1@reader1.panix.com>

In <w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d at pdx.net> Scott David Daniels <Scott.Daniels at Acm.Org> writes:

>kj wrote:
>> ...  I can't come with an example in which the same couldn't be
>> accomplished with
>> 
>> try:
>>     # do something
>>     # do something else
>> except ...:
>>     # handle exception
>> 
>> The only significant difference I can come up with is that in the
>> second form, the except clause may be masking some unexpected
>> exceptions from the "do something else" part.  Is this the rationale
>> behind this else clause?  Or is there something more to it?

>Yes, in a way.  The idea of catching particular exceptions is to only
>handle exceptions you expect (let the others go out to more general
>reporters).  So, not only should you choose the tightest exception to
>catch that you can, but you should look for it in a very narrow window:
>exactly where you expect it.

>     try:
>         v = mumble.field
>     except AttributeError:
>         pass
>     else:
>         sys.warning('field was actually there?')

>as opposed to:

>     try:
>         v = mumble.field
>         sys.warning('field was actually there?')
>     except AttributeError:
>         pass

>The idea is to make it clear what you expect might go
>wrong that you are prepared to handle.

Wow.  As rationales for syntax constructs go, this has got to be
the most subtle one I've ever seen...

Thanks!

kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From aahz at pythoncraft.com  Mon May 11 11:22:10 2009
From: aahz at pythoncraft.com (Aahz)
Date: 11 May 2009 08:22:10 -0700
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
References: <mailman.5282.1241783298.11746.python-list@python.org>
	<gu6i38$jhk$1@panix3.panix.com>
	<mailman.5375.1241962005.11746.python-list@python.org>
Message-ID: <gu9fr2$je5$1@panix3.panix.com>

In article <mailman.5375.1241962005.11746.python-list at python.org>,
Geoff Gardiner  <ggardiner at iee.org> wrote:
>Aahz wrote:
>> 
>> What directory are you running this from?  What happens if you switch to
>> running "python Lib/test/regrtest.py"?  Taking a closer look, this looks
>> more like a plain import error.
>
>I couldn't do quite that because there's no Lib, but instead (in Ubuntu
>Hardy, this time):
>....
>gegard at gegard:~$ cd /usr/lib/python2.5/
>gegard at gegard:/usr/lib/python2.5$ python test/regrtest.py
>
>9 tests skipped:
>    test_builtin test_doctest test_doctest2 test_exceptions
>    test_grammar test_opcodes test_operations test_types test_unittest
>Traceback (most recent call last):
>  File "test/regrtest.py", line 1384, in <module>
>    main()
>  File "test/regrtest.py", line 416, in main
>    e = _ExpectedSkips()
>  File "test/regrtest.py", line 1321, in __init__
>    from test import test_socket_ssl
>ImportError: cannot import name test_socket_ssl
>gegard at gegard:/usr/lib/python2.5$
>
>Also
>gegard at gegard:~$ locate */test_socket_ssl.*
>gegard at gegard:~$ #returns nothing
>
>And
>gegard at gegard:~$ locate /usr/lib/python2.5/test/test_*.*
>/usr/lib/python2.5/test/test_support.py
>/usr/lib/python2.5/test/test_support.pyc
>gegard at gegard:~$

That seems to demonstrate that regrtest.py is indeed a good mechanism for
finding out whether it's a b0rked install!
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From kyosohma at gmail.com  Mon May 11 11:22:25 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 11 May 2009 08:22:25 -0700 (PDT)
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
Message-ID: <74c79941-af9b-4b43-b02b-8316b108f08d@l28g2000vba.googlegroups.com>

On May 11, 9:53?am, "Adam Gaskins" <agaskins... at kelleramerica.com>
wrote:
> Hi all,
>
> -- Non critical info--
> I am a fairly seasoned PHP developer (don't shoot, I'm changing teams!:) who
> is admittedly behind the curve with OOP. Like most who learned PHP, I
> started doing web app backend stuff, but I have moved to full blown windows
> apps in the last 6 months using Winbinder. As you may know Winbinder is
> essentially abandoned, and programming windows apps with Winbinder or even
> GTK-PHP is less than ideal. I also deal heavily in serial/rs-232
> communications which is a pain in PHP. Long story short, I'm tired of doing
> things in such a hackish manner and want to write applications that are
> cross platform (I'd like to get our production dept on linux eventually) and
> truely object oriented.
> -- END non critical stuff--
>
> So I was beginning to learn OOP for PHP, and it seemed to me that abstract
> classes were just right for my application. In my application I must
> communicate with several peices of test equipment that communicate via
> RS-232. Most use SCPI instructions, some do not and require low level
> communication.
>
> The way I understand abstract classes is that I could have a class that has
> all my abstract methods such as 'init', 'getMeasurement', 'setPressure',
> etc... then I could use this common interface to to control my different
> pieces of hardware (after I write a library for each of them).
>
> Is this a valid application for abstract classes? Or am I making life more
> complicated than it need be?
>
> Now, I have read that Pythons OOP implimentation is so much better and more
> complete then PHP's, but I cant find anything about abstract classes except
> this:http://norvig.com/python-iaq.html
>
> ...which says it doesn't exist in Python and you can only do this hack to
> make it work (and I don't particularly understand how to impliment it from
> this article).
>
> This makes me suspect I am making things more comlicated than they need to
> be. Could someone help me understand the proper way to impliment a set
> classes/methods to deal with several peices of similar and not so similar
> hardware? Not looking for anyone to write code for me, just help
> understanding some of these OOP concepts and how they would apply to my
> situation.
>
> Thanks!
> -Adam

I've never used (or heard of) the Abstract type...and the guy who
wrote the FAQ was being a jerk. It looks like he was just throwing in
an undefined variable name just to make his Python program break while
taking a pot shot at people who use that sort of thing. Whatever.

According to wikipedia, dynamic languages don't implement Abstract as
they can accomplish the same thing via duck typing:
http://en.wikipedia.org/wiki/Abstract_class .  The way it describes
the class, it made me think of decorators as well.

Hopefully someone who has used Abstract classes will jump in here and
give you more information about whether or not they matter in Python.

Mike


From denis.papathanasiou at gmail.com  Mon May 11 11:59:20 2009
From: denis.papathanasiou at gmail.com (dpapathanasiou)
Date: Mon, 11 May 2009 08:59:20 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<12ef7b00-f0c5-4030-a353-533d93d23cdd@r3g2000vbp.googlegroups.com> 
	<794f117f-4df5-4c6c-be68-f901959b2579@y10g2000prc.googlegroups.com> 
	<d64eeab4-f07c-4f06-a70c-0c78278b2c2f@r34g2000vba.googlegroups.com>
Message-ID: <037bc6d0-3d2e-45bd-91d3-d3051fbfa149@s31g2000vbp.googlegroups.com>

For the record, and in case anyone else runs into this particular
problem, here's how resolved it.

My original xml_utils.py was written this way:

from xml.dom import minidom

def parse_item_attribute (item, attribute_name):
    item_doc = minidom.parseString(item)
    ...

That version worked under the python interpreter, but failed under
both mod_python and mod_wsgi apache modules with an error ("Parent
module 'xml.dom' not loaded").

I found that changing the import statement and the minidom reference
within the function resolved the problem.

I.e., after rewriting xml_utils.py this way, it works under both
apache modules as well as in the python interpreter:

import xml.dom.minidom

def parse_item_attribute (item, attribute_name):
    item_doc = xml.dom.minidom.parseString(item)
    ...



From marco at sferacarta.com  Mon May 11 11:59:31 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Mon, 11 May 2009 17:59:31 +0200
Subject: OOP & Abstract Classes
In-Reply-To: <74c79941-af9b-4b43-b02b-8316b108f08d@l28g2000vba.googlegroups.com>
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
	<74c79941-af9b-4b43-b02b-8316b108f08d@l28g2000vba.googlegroups.com>
Message-ID: <EXXNl.12201$Ux.6636@tornado.fastwebnet.it>

Mike Driscoll wrote:

> I've never used (or heard of) the Abstract type...and the guy who
> wrote the FAQ was being a jerk.

Who, Peter Norvig?

(from wikipedia)

Peter Norvig is an American computer scientist. He is currently the 
Director of Research (formerly Director of Search Quality) at Google Inc.

He is a Fellow and Councilor of the American Association for Artificial 
Intelligence and co-author, with Stuart Russell, of Artificial 
Intelligence: A Modern Approach, now the standard college text. He 
previously was head of the Computational Sciences Division (now the 
Intelligent Systems Division) at NASA Ames Research Center, where he 
oversaw a staff of 200 scientists performing NASA's research and 
development in autonomy and robotics, automated software engineering and 
data analysis, neuroengineering, collaborative systems research, and 
simulation-based decision-making. Before that he was Chief Scientist at 
Junglee, where he helped develop one of the first Internet comparison 
shopping services; Chief designer at Harlequin Inc.; and Senior 
Scientist at Sun Microsystems Laboratories.

etc. etc.


Yes, I usually look up in wikipedia before calling anyone a jerk :) :)


From mikael at isy.liu.se  Mon May 11 12:04:04 2009
From: mikael at isy.liu.se (Mikael Olofsson)
Date: Mon, 11 May 2009 18:04:04 +0200
Subject: Decorating methods - where do my arguments go?
In-Reply-To: <Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
	<gu8u7s$l1$1@news.lysator.liu.se>
	<Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>
Message-ID: <gu954t$29r$1@news.lysator.liu.se>

Duncan Booth wrote:

> The __get__ method should be returning a new object, NOT modifying the 
> state of the decorator. As written it will break badly and unexpectedly 
> in a variety of situations:
> 
> [snip good examples of things going bad]

Ouch! So, does that mean that George's solution based on a function is 
the way to go, or does that mean that my __call__ should analyze the 
passed callable?

/MiO


From iwan at reahl.org  Mon May 11 12:19:41 2009
From: iwan at reahl.org (Iwan)
Date: Mon, 11 May 2009 09:19:41 -0700 (PDT)
Subject: How to debug this import problem?
References: <mailman.5300.1241802485.11746.python-list@python.org> 
	<76j8vcF1crfkoU1@mid.uni-berlin.de>
	<DumdnY8P7-xs65nXnZ2dnUVZ_jidnZ2d@pdx.net> 
	<ebc63140-6f1f-44a0-8046-574fb3530fed@s21g2000vbb.googlegroups.com>
Message-ID: <9b48b208-f656-4de0-9fd7-2aec9394cc2c@q2g2000vbr.googlegroups.com>

Mmm, we solved half of the cause of this one.

Test runs are kicked off via setuptools's test command. But this
happens programmatically, and successively in one process.  But
setuptools's test command clears all modules imported during a test
run from sys.modules - hence it is intended that modules would be re-
imported.

Why certain of our code managed to still get to the classes contained
in prior imports is still a mystery though.

-Iwan


From gazathome at gmail.com  Mon May 11 12:27:16 2009
From: gazathome at gmail.com (gazathome at gmail.com)
Date: Mon, 11 May 2009 09:27:16 -0700 (PDT)
Subject: Writing text to a Word Document
Message-ID: <8ba265c9-4697-41b4-a117-04761a86a945@g20g2000vba.googlegroups.com>

Hi everyone,

I am trying to write several attributes from a database table and
using the code below I can write the values however it is only
overwriting on the first line.

I am new to the win32com bit and I would like to know what is the
recommended reference to loop down the page and add multiple records
rather than the worddoc.Content.

I have read a little about writing this to an RTF or htmol but I am
getting information overload and going nowhere.  Does anyone have a
nice tutorial out there that simply explains how to do this?

Much appreciated for any thoughts.

Cheers,

Gareth

import win32com.client, arcgisscripting, sys, os
gp = arcgisscripting.create(9.3)

#Create word document component - http://www.faqts.com/knowledge_base/view.phtml/aid/37034/fid/244
wordapp = win32com.client.Dispatch("Word.Application") # Create new
Word Object
wordapp.Visible = 1 # Word Application should`t be visible
worddoc = wordapp.Documents.Add() # Create new Document Object
worddoc.Content.Font.Size = 11
worddoc.Content.Paragraphs.TabStops.Add (100)

#Setup of GDB Connection
# Get the Featureclass from the Mobel - Property Box
PropBox = "C:\\Avon Fire Rescue\\data\AvonFire_1.gdb\\PropertyBox"

# Make a search cursor for the Property Box Feature class
PBselCur = gp.searchcursor(PropBox)
PBrow = PBselCur.reset()
PBrow = PBselCur.next()

#Using the search cursor get the Premise ID from a Property box

while PBrow:
    PBrowVal = PBrow.getvalue("PremisesID")
    #Add data to Word Document
    worddoc.Content.Text = (PBrowVal)
    PBrow = PBselCur.next()

#worddoc.Close() # Close the Word Document (a save-Dialog pops up)

print "Fin"



From __peter__ at web.de  Mon May 11 12:28:54 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 11 May 2009 18:28:54 +0200
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
	<gu8u7s$l1$1@news.lysator.liu.se>
	<Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>
	<gu954t$29r$1@news.lysator.liu.se>
Message-ID: <gu9jo6$9bk$01$1@news.t-online.com>

Mikael Olofsson wrote:

> Duncan Booth wrote:
> 
>> The __get__ method should be returning a new object, NOT modifying the
>> state of the decorator. As written it will break badly and unexpectedly
>> in a variety of situations:
>> 
>> [snip good examples of things going bad]
> 
> Ouch! So, does that mean that George's solution based on a function is
> the way to go, or does that mean that my __call__ should analyze the
> passed callable?

I usually use decorator functions, but I think the following should work, 
too:

class deco(object):
    def __init__(self, func):
        self._func = func
    def __call__(self, *args):
        print "Decorator:", args
        self._func(*args)
    def __get__(self, *args):
        return deco(self._func.__get__(*args))

Peter



From james at agentultra.com  Mon May 11 12:29:25 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 11 May 2009 12:29:25 -0400
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5109.1241543371.11746.python-list@python.org>
	<85d4am8hq4.fsf@agentultra.com>
	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
	<8563gcx1p1.fsf@agentultra.com>
	<0214c407$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <85zldj38nu.fsf@agentultra.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

> On Thu, 07 May 2009 13:28:10 -0400, J Kenneth King wrote:
>
>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>> 
>>> On Wed, 06 May 2009 09:48:51 -0400, J Kenneth King wrote:
>>>
>>>> Emile van Sebille <emile at fenx.com> writes:
>>>> 
>>>>> On 5/5/2009 9:15 AM J Kenneth King said...
>>>>>
>>>>>> List comprehensions can make a reader of your code apprehensive
>>>>>> because it can read like a run-on sentence and thus be difficult to
>>>>>> parse. The Python documentation discourages their use and I believe
>>>>>> for good reason.
>>>>>
>>>>> Can you provide a link for this?  I'd like to see specifically what's
>>>>> being discouraged, as I'd be surprised to find routine usage frowned
>>>>> upon.
>>>>>
>>>>> Emile
>>>> 
>>>> http://docs.python.org/tutorial/datastructures.html#nested-list-
>>> comprehensions
>>>> 
>>>> 
>>>> "If you?ve got the stomach for it, list comprehensions can be nested.
>>>> They are a powerful tool but ? like all powerful tools ? they need to
>>>> be used carefully, if at all."
>>>
>>> How does this discourage the use of list comprehensions? At most, it
>>> warns that complicated list comps are tricky. Complicated *anything*
>>> are tricky.
>> 
>> They are tricky and need to be used carefully, *if at all*.
>> 
>> IMO this means that if there's a way to do it without a nested list
>> comprehension, then that solution should be preferred.
>
> Earlier, you claimed that list comps in general were discouraged:
>
> "List comprehensions can make a reader of your code apprehensive because 
> it can read like a run-on sentence and thus be difficult to parse. The 
> Python documentation discourages their use and I believe for good reason."

Ooops. Typo. My bad. Had it been quoted earlier it would have saved a
few posts for sure. Such is the Internet. :)

> Emile said "I'd be surprised to find routine usage frowned upon", giving 
> you the opportunity to correct his (mis)understanding. You failed to do 
> so, which I took as meaning that you agreed that routine usage of simple 
> list comps were frowned upon. Now you're talking about *nested* list 
> comps. You started off (apparently) objecting to list comps in general, 
> because they "can" make readers apprehensive. Now you seem to be saying 
> that it's only the complicated, overly-dense ones which rightly make 
> readers apprehensive which you object to.

I was rather confused by that. I use list comps all the time and said
several times that I don't object to list comps, just nested ones.

> I suppose we're making progress if we agree that the Python docs warn 
> against unnecessarily complicated nested list comps. Whether it 
> discourages as well as warns is a matter of interpretation. But there's 
> certainly no sign that list comps as a general technique are discouraged 
> just because overly-complicated list comps are tricky to read. The same 
> can be said about *any* piece of code.

Well I did my best to make my interpretation clear. If the
documentation says that nested list comps are difficult to read and
should be used rarely, if at all, then I generally consider that
"discouraging" their use. Meaning of course that in the right
situation one may be able to justify their own use of a nested comp.
However, for every day problems one wouldn't be encouraged to use them
so liberally as some tend to do.


So.. we have some sort of consensus then? This might be a rare
phenomenon on Usenet... :)

Cheers,

J.


From yahoo at al-got-rhythm.net  Mon May 11 12:30:03 2009
From: yahoo at al-got-rhythm.net (jalanb3)
Date: Mon, 11 May 2009 16:30:03 -0000
Subject: Can I get a value's name
Message-ID: <gu9jqb+q7rk@eGroups.com>

Context for this question arises from some recent code. In particular the "replace_line" method, which takes in a regexp to look for, and a replacement for when it matches.

It is supposed to work for single lines only (we add ^ and $ to the regexp), so arguments which have '\n' in them are not accepted.

So at start of the method we search for such bad chars, and the code ends up something like this:

def replace_line(pattern,replacement):
    errors = '\n' in pattern and [ 'pattern' ] or []
    errors += '\n' in replacement and [ 'replacement' ] or []
    values = [ locals()[e] for e in errors ]
    # etc, etc, and eventually:
    print 'Argument %s is bad : "%s"' % (errors[0],values[0])

And the question arises from that locals() line:
    Given a variable name I can use locals() to get the value
    Is there a way to do it the other way round
        Given the value, can I get the variable name ?

For example, suppose I had started like this (using the variables, not strings with their names)

def replace_line(pattern,replacement):
    values = '\n' in pattern and [ pattern ] or []
    values += '\n' in replacement and [ replacement ] or []

Can I later get the name "pattern" via values[0]?

If this was an array in another language:
    Of course not, values[0] is a copy of the value
        so the connection to the variable is lost
But, AFAIK, in Python values[0] is "just a rename" of pattern
    so there might be a way to get "through to" the original variable

Thank you for reading this far.
    If you were now to start writing, I'd be very grateful indeed.

-- 
Alan

P.S. This is just curiosity - replace_lines() works great as is.



From pje at telecommunity.com  Mon May 11 12:35:58 2009
From: pje at telecommunity.com (P.J. Eby)
Date: Mon, 11 May 2009 12:35:58 -0400
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <4A059639.7040505@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<4A059639.7040505@v.loewis.de>
Message-ID: <20090511163321.984D53A4109@sparrow.telecommunity.com>

At 04:42 PM 5/9/2009 +0200, Martin v. L?wis wrote:
> >> If you always use --single-version-externally-managed with easy_install,
> >> it will stop editing .pth files on installation.
> >
> > It's --multi-version (-m) that does that.
> > --single-version-externally-managed is a "setup.py install" option.
> >
> > Both have the effect of not editing .pth files, but they do so in
> > different ways.  The "setup.py install" option causes it to install in a
> > distutils-compatible layout, whereas --multi-version simply drops .egg
> > files or directories in the target location and leaves it to the user
> > (or the generated script wrappers) to add them to sys.path.
>
>Ah, ok. Is there also an easy_install invocation that unpacks the zip
>file into some location of sys.path (which then wouldn't require
>editing sys.path)?

No; you'd have to use the -e option to easy_install to download and 
extract a source version of the package; then run that package's 
setup.py, e.g.:

    easy_install -eb /some/tmpdir SomeProject
    cd /some/tmpdir/someproject  # subdir is always lowercased/normalized
    setup.py install --single-version-externally-managed --record=...

I suspect that this is basically what pip is doing under the hood, as 
that would explain why it doesn't support .egg files.

I previously posted code to the distutils-sig that was an .egg 
unpacker with appropriate renaming, though.  It was untested, and 
assumes you already checked for collisions in the target directory, 
and that you're handling any uninstall manifest yourself.  It could 
probably be modified to take a filter function, though, something like:

def flatten_egg(egg_filename, extract_dir, filter=lambda s,d: d):
      eggbase = os.path.filename(egg_filename)+'-info'
      def file_filter(src, dst):
          if src.startswith('EGG-INFO/'):
              src = eggbase+s[8:]
              dst = os.path.join(extract_dir, *src.split('/'))
          return filter(src, dst)
      return unpack_archive(egg_filename, extract_dir, file_filter)

Then you could pass in a None-returning filter function to check and 
accumulate collisions and generate a manifest.  A second run with the 
default filter would do the unpacking.

(This function should work with either .egg files or .egg directories 
as input, btw, since unpack_archive treats a directory input as if it 
were an archive.)

Anyway, if you used "easy_install -mxd /some/tmpdir [specs]" to get 
your target eggs found/built, you could then run this flattening 
function (with appropriate filter functions) over the *.egg contents 
of /some/tmpdir to do the actual installation.

(The reason for using -mxd instead of -Zmaxd or -zmaxd is that we 
don't care whether the eggs are zipped or not, and we leave out the 
-a so that dependencies already present on sys.path aren't copied or 
re-downloaded to the target; only dependencies we don't already have 
will get dropped in /some/tmpdir.)

Of course, the devil of this is in the details; to handle conflicts 
and uninstalls properly you would need to know what namespace 
packages were in the eggs you are installing.  But if you don't care 
about blindly overwriting things (as the distutils does not), then 
it's actually pretty easy to make such an unpacker.

I mainly haven't made one myself because I *do* care about things 
being blindly overwritten.



From norseman at hughes.net  Mon May 11 12:51:48 2009
From: norseman at hughes.net (norseman)
Date: Mon, 11 May 2009 09:51:48 -0700
Subject: Wrapping comments
In-Reply-To: <towb-EA7906.14423909052009@news.individual.de>
References: <towb-EA7906.14423909052009@news.individual.de>
Message-ID: <4A0857A4.9090108@hughes.net>

Tobias Weber wrote:
> Hi,
> the guideline (PEP 8) is hard wrap to 7x characters. The reason given is 
> that soft wrap makes code illegible.
> 
> So what if you hard wrap code but let comments and docstrings soft-wrap?
> 
> Otherwise it's hugely annoying to edit them. Say you remove the first 
> three words of a 150 character sentence. Either keep the ugly or rewrap 
> manually.
> 
> Or are there editors that can do a "soft hard wrap" while keeping 
> indentation and #comment markers intact?
> 

=======================
Paragraph 1:  65 and 72 cols are US typewriter standard 12 and 10 pt
               respectively. (MSDOS screen, business standard paper, ..)
               And yes, soft wrap does. Check the hardcopy which wraps
               code with lots of long lines.

Paragraph 2:  Comments? I vote no. These are in the code and should
               conform to helping at that location.
               Doc_stuff - I vote yes. For the obvious reason that it
               makes formating the Docs easier AND is to be 'extracted'
               to a separate file for that purpose in the first place.

Paragraph 3:  True

Could you give a short example of what you are referring to in your last 
paragraph?  I showed this to several friends and got several 'views' as 
to what is intended.


I assume you are NOT intending to use third party programs to write code 
in but rather to use Python somehow?

I assume you are intending that the editor add the backslash newline at 
  appropriate places without causing a word or code break when needed 
and simply wrapping with indent without breaking the code the rest of 
the time and doing so in such a fashion that ALL general text editors 
will be able to display code properly as well as be usable in modifying 
code?
Not to mention that the interpreter and/or compiler will still be able 
to use the file.


Steve



From norseman at hughes.net  Mon May 11 13:06:28 2009
From: norseman at hughes.net (norseman)
Date: Mon, 11 May 2009 10:06:28 -0700
Subject: Complete frustration
In-Reply-To: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
Message-ID: <4A085B14.2060908@hughes.net>

hellcats wrote:
> I have Python2.5 installed on Windows XP. Whenever I double click on a
> something.pyw file, IDLE launches and opens something.pyw in the
> editor. I would prefer to actually *RUN* the program, not edit it. If
> I want to edit it then I'll choose the "Edit with IDLE" context menu.
> So I then have to press F5 to get the program to execute. Now I have
> my program's windows along with two IDLE windows cluttering my screen
> and task bar. WHAT IS GOING ON? I've tried changing the file
> association to python.exe, and that works, but just ONCE (even if I
> choose "always use the slected program to launch this kind of file").
> IDLE may be great and all, but I fricken' don't want to see it every
> time I just want to run a python program!!!!!
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
------------------------
I agree completely.  Check the Python-List archives. Look for a file 
that is dated July 8, 2008 (07/08/2008) that was sent by norseman.

It works for me.


Steve


From agaskins_ng at kelleramerica.com  Mon May 11 13:06:42 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Mon, 11 May 2009 13:06:42 -0400
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
	<74c79941-af9b-4b43-b02b-8316b108f08d@l28g2000vba.googlegroups.com>
	<EXXNl.12201$Ux.6636@tornado.fastwebnet.it>
Message-ID: <IWYNl.48506$bi7.46973@newsfe07.iad>

Any idea why I didn't see this reply on my ng? I only see the reply from 
Marco. Can't help but wonder if there is more that is not getting through 
here.

Would someone mind forwarding me any other replies?

FWIW I'm using news.east.cox.net.

Thanks,
-Adam

> Mike Driscoll wrote:
>
>> I've never used (or heard of) the Abstract type...and the guy who
>> wrote the FAQ was being a jerk.




From norseman at hughes.net  Mon May 11 13:16:19 2009
From: norseman at hughes.net (norseman)
Date: Mon, 11 May 2009 10:16:19 -0700
Subject: unicode bit me
In-Reply-To: <0214c5da$0$20647$c3e8da3@news.astraweb.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>	<0vadnQqkdrdQz5nXnZ2dnUVZ_uOdnZ2d@pdx.net>	<mailman.5308.1241806970.11746.python-list@python.org>
	<0214c5da$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <4A085D63.7000605@hughes.net>

Steven D'Aprano wrote:
> On Fri, 08 May 2009 14:22:32 -0400, Terry Reedy wrote:
> 
>> Scott David Daniels wrote:
>>
>>> <rant>It would be a bit easier if people would bother to mention their
>>> Python version, as we regularly get questions from people running 2.3,
>>> 2.4, 2.5, 2.6, 2.7a, 3.0, and 3.1b.  They run computers with differing
>>> operating systems and versions such as: Windows 2000, OS/X Leopard,
>>> ubuntu Hardy Heron, SuSE, ....
>> And if they copy and paste the actual error messages instead of saying
>> 'It doesn't work'
> 
> "I tried to copy and paste the actual error message, but it doesn't 
> work..."
> 
> 
> *grin*
> 
> 
==========================
In Linux get/use gpm and copy paste is simple.
In Microsoft see:  Python-List file dated  May 6, 2009 (05/06/2009) sent 
by norseman.


From Scott.Daniels at Acm.Org  Mon May 11 13:18:18 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 11 May 2009 10:18:18 -0700
Subject: Can I get a value's name
In-Reply-To: <mailman.0.1242059758.12689.python-list@python.org>
References: <mailman.0.1242059758.12689.python-list@python.org>
Message-ID: <HbmdnYRzSuo9wZXXnZ2dnUVZ_v2dnZ2d@pdx.net>

jalanb3 wrote:
> ... Given a variable name I can use locals() to get the value
>     Is there a way to do it the other way round
>         Given the value, can I get the variable name ?

(1) Yes you can in some cases.
(2) You should not, things do not inherently have a name.

With that prelude:
     def find_names(value, dictionary):
         for name, val in dictionary.items():
             if val is value: # note: "is", not "=="
                 yield name

     x = 123456
     y = 123456 * 3 // 3
     z = 123456.0
     q = y
     print list(find_names(y, locals()))

--Scott David Daniels
Scott.Daniels at Acm.Org


From chambon.pascal at wanadoo.fr  Mon May 11 13:59:12 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Mon, 11 May 2009 19:59:12 +0200
Subject: stand alone exec
In-Reply-To: <805f59d50905102006obd4e42bo6b8923b62f84f6d6@mail.gmail.com>
References: <805f59d50905102006obd4e42bo6b8923b62f84f6d6@mail.gmail.com>
Message-ID: <4A086770.6060607@wanadoo.fr>

Hello

It sounds indeed like a runtime library problem...

You should run a dependancy finder (like dependency walker - 
http://www.dependencywalker.com/) on your executable, and thus see what 
might be lacking on other systems.
I know that on *nix systems there are tools to see more precisely what's 
missing, but on windows, exept that tool I don't know much.

Regards,
Pascal



prakash jp a ?crit :
> Hi all,
>  
> I want to run dos commands through python stand alone execs. The 
> created Python stand alone executable (py2exe)  works fine
>  
> in my machine but on transferring the "dist" folder to other systems 
> the executable fails to run.
>  
> I tried to copy the MSVCP90.dll in the "dist" folder. Also tried to 
> exclude the same dll in the options of the setup.py file
>  
> The error reads as follows :
>  
> "The application has failed to start because the application 
> configuration is incorrect. Reinstalling the application may fix this 
> problem".
>  
> Details of the installed setup files may be useful :
>  
> 1- python-2.6.1.msi
> 2- py2exe-0.6.9.win32-py2.6.exe
> 3- pywin32-212.win32-py2.6.exe
>  
> Thanks in advance
>  
> Regards
> Prakash
> ------------------------------------------------------------------------
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>   

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From tim.arnold at sas.com  Mon May 11 14:04:30 2009
From: tim.arnold at sas.com (Tim Arnold)
Date: Mon, 11 May 2009 14:04:30 -0400
Subject: piping input to an external script
Message-ID: <gu9pbe$csc$1@foggy.unx.sas.com>

Hi, I have some html files that I want to validate by using an external 
script 'validate'. The html files need a doctype header attached before 
validation. The files are in utf8 encoding. My code:
---------------
import os,sys
import codecs,subprocess
HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'

filename  = 'mytest.html'
fd = codecs.open(filename,'rb',encoding='utf8')
s = HEADER + fd.read()
fd.close()

p = subprocess.Popen(['validate'],
                    stdin=subprocess.PIPE,
                    stdout=subprocess.PIPE,
                    stderr=subprocess.STDOUT)
validate = p.communicate(unicode(s,encoding='utf8'))
print validate
---------------

I get lots of lines like this:
Error at line 1, character 66:\tillegal character number 0
etc etc.

But I can give the command in a terminal 'cat mytest.html | validate' and 
get reasonable output. My subprocess code must be wrong, but I could use 
some help to see what the problem is.

python2.5.1, freebsd6
thanks,
--Tim




From gert.cuykens at gmail.com  Mon May 11 14:08:03 2009
From: gert.cuykens at gmail.com (gert)
Date: Mon, 11 May 2009 11:08:03 -0700 (PDT)
Subject: sqlite single transaction without foreign key or triggers
Message-ID: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>

I am trying to do this in a single transaction, the 3 separate
statements work fine, but i am screwed if they are not executed
together.

 ########### db.execute('BEGIN') #############
 db.execute('UPDATE users SET uid=? WHERE uid=?',(v['uid'],s.UID))
 db.execute('UPDATE sessions SET uid=? WHERE sid=?',(v['uid'],s.SID))
 # only do this if there is no primary key conflict in the above
 if db.ERROR == None: db.execute('UPDATE groups SET uid=? WHERE uid=?',
(v['uid'],s.UID))
 ########### db.execute('END') #####################

My tables are as follows

CREATE TABLE users (
    uid     VARCHAR(64) PRIMARY KEY,
    name    VARCHAR(64) DEFAULT '',
    adress  VARCHAR(64) DEFAULT '',
    city    VARCHAR(64) DEFAULT '',
    country VARCHAR(64) DEFAULT '',
    phone   VARCHAR(64) DEFAULT '',
    picture BLOB
);

CREATE TABLE groups (
    gid     VARCHAR(64),
    uid     VARCHAR(64),
    PRIMARY KEY(gid,uid),
    FOREIGN KEY(uid) REFERENCES users(uid) ON UPDATE CASCADE ON DELETE
CASCADE
);

CREATE TABLE sessions (
    uid     VARCHAR(64) UNIQUE,
    pwd     VARCHAR(64) DEFAULT '',
    sid     VARCHAR(64) PRIMARY KEY,
    exp     DATETIME,
    FOREIGN KEY(uid) REFERENCES users(uid) ON UPDATE CASCADE ON DELETE
CASCADE
);

What is the python or sql way of doing this kind of things ?




From samwyse at gmail.com  Mon May 11 14:16:14 2009
From: samwyse at gmail.com (samwyse)
Date: Mon, 11 May 2009 11:16:14 -0700 (PDT)
Subject: creating classes with mix-ins
Message-ID: <d6409bb3-f2ed-4964-942a-b0698060a7f0@e24g2000vbe.googlegroups.com>

I'm writing a class that derives it's functionality from mix-ins.
Here's the code:

    def boilerplate(what):   # This used to be a decorator, but all of
the
        ##what = f.__name__  # function bodies turned out to be
'pass'.
        'Validate the user, then call the appropriate plug-in.'
        def template(self, which, username, password, *args):
            if not self.security.isAuthorised(username, password,
which, what):
                raise Exception('Unauthorised access')
            return getattr(self.blog, what)(which, *args)
        template.__name__ = what
        template.__doc__ = getattr(self.blog, what).__doc__
        return template

    class MetaWeblog(object):
        def __init__(self,
                     securityHandler=SimpleSecurityHandler,
                     blogHandler=SimpleBlogHandler):
            self.security = securityHandler()
            self.blog = blogHandler()
        newPost = boilerplate('newPost')
        editPost = boilerplate('editPost')
        getPost = boilerplate('getPost')
        # etc, etc, etc

I'd like to replace the method definitions with a loop:
        for what in attr_list:
            setattr(klass, what, boilerplate(what))

That begs the question of where I define 'klass' and 'attr_list'.
Should I use a class decorator, or a metaclass?  In favor of
decorators is that I can see how to do it; in favor of a metaclass is
that I get to learn how to use them.  ;-)  What are the other pros and
cons for each choice?


From research at johnohagan.com  Mon May 11 14:21:58 2009
From: research at johnohagan.com (John O'Hagan)
Date: Mon, 11 May 2009 18:21:58 +0000
Subject: Can I get a value's name
In-Reply-To: <gu9jqb+q7rk@eGroups.com>
References: <gu9jqb+q7rk@eGroups.com>
Message-ID: <200905111821.59253.research@johnohagan.com>

On Mon, 11 May 2009, jalanb3 wrote:

[...]

>
> def replace_line(pattern,replacement):
>     errors = '\n' in pattern and [ 'pattern' ] or []
>     errors += '\n' in replacement and [ 'replacement' ] or []
>     values = [ locals()[e] for e in errors ]
>     # etc, etc, and eventually:
>     print 'Argument %s is bad : "%s"' % (errors[0],values[0])
>
> And the question arises from that locals() line:
>     Given a variable name I can use locals() to get the value
>     Is there a way to do it the other way round
>         Given the value, can I get the variable name ?
>
> For example, suppose I had started like this (using the variables, not
> strings with their names)
>
> def replace_line(pattern,replacement):
>     values = '\n' in pattern and [ pattern ] or []
>     values += '\n' in replacement and [ replacement ] or []
>
> Can I later get the name "pattern" via values[0]?
>
[...]

def replace_line(pattern,replacement):
    values = '\n' in pattern and [ pattern ] or []
    values += '\n' in replacement and [replacement] or []
    loc=locals()
    print [i for i in loc if loc[i] is pattern if pattern in values]

will print ['pattern'] if the value of pattern is in values (if there's a 
newline in pattern). Is that what you're after?

HTH,

John


From arnodel at googlemail.com  Mon May 11 14:25:15 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 11 May 2009 19:25:15 +0100
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
	<mailman.5386.1241975816.11746.python-list@python.org>
	<towb-E11980.22281210052009@news.individual.de>
Message-ID: <m27i0no5tg.fsf@googlemail.com>

Tobias Weber <towb at gmx.net> writes:

> In article <mailman.5386.1241975816.11746.python-list at python.org>,
>  David Robinow <drobinow at gmail.com> wrote:
>
>> (define-key key-translation-map [?\M-3] "#")
>> 
>> 
>> or, if you prefer, just be sick.
>
> Thanks, but I don't believe using releases from people who think I jump 
> should through hoops just to make my keyboard work is a good plan for a 
> relaxed future. According to their release notes this was (once) fixed 
> years ago.

No need for editing .emacs.

Click 'Options' on the menu bar, hover down to the 'Option Key >' item,
then select the 'Meta & British' option.  This is IMHO the best option
(if you have a UK keyboard, of course!).  This way, Alt-3 gives you a
'#'.

It would be a shame to abandon Aquamacs just for this, they have made a
lot of efforts to make it integrate well with OSX and I think this is
one of the few hurdles that are left.

-- 
Arnaud


From nick at craig-wood.com  Mon May 11 14:30:04 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 11 May 2009 13:30:04 -0500
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
Message-ID: <slrnh0grfa.8na.nick@irishsea.home.craig-wood.com>

Adam Gaskins <agaskins_ng at kelleramerica.com> wrote:
>  I am a fairly seasoned PHP developer (don't shoot, I'm changing teams!:) who 
>  is admittedly behind the curve with OOP. Like most who learned PHP, I 
>  started doing web app backend stuff, but I have moved to full blown windows 
>  apps in the last 6 months using Winbinder. As you may know Winbinder is 
>  essentially abandoned, and programming windows apps with Winbinder or even 
>  GTK-PHP is less than ideal. I also deal heavily in serial/rs-232 
>  communications which is a pain in PHP. Long story short, I'm tired of doing 
>  things in such a hackish manner and want to write applications that are 
>  cross platform (I'd like to get our production dept on linux eventually) and 
>  truely object oriented.
> 
>  So I was beginning to learn OOP for PHP, and it seemed to me that abstract 
>  classes were just right for my application. In my application I must 
>  communicate with several peices of test equipment that communicate via 
>  RS-232. Most use SCPI instructions, some do not and require low level 
>  communication.
> 
>  The way I understand abstract classes is that I could have a class that has 
>  all my abstract methods such as 'init', 'getMeasurement', 'setPressure', 
>  etc... then I could use this common interface to to control my different 
>  pieces of hardware (after I write a library for each of them).
> 
>  Is this a valid application for abstract classes? Or am I making life more 
>  complicated than it need be?

This sounds like a fine use for Abstract classes.

Python doesn't have language support for them directly, but they are
usually written like this

    class DeviceBase(object):
        def __init__(self):
            raise NotImplementedError()
        def getMeasusrement(self):
            raise NotImplementedError()
        def setPressure(self, pressure):
            raise NotImplementedError()

Then subclass it for the real functionality

    class RealDevice(DeviceBase):
        def __init__(self):
            self.pressure = 0
        def getMeasusrement(self):
            return 0
        def setPressure(self, pressure):
            self.pressure = pressure

However, I normally found that there is some functionality that is
common to all subclasses so there may be some real methods in your
DeviceBase class, eg

class DeviceBase(object):
    def __init__(self, device):
        self.device = device
    def getMeasurement(self):
        raise NotImplementedError()
    def setPressure(self, pressure):
        raise NotImplementedError()
    def __repr__(self):
        return "%s(%r)" % (self.__class__.__name__, self.device)

class RealDevice(DeviceBase):
    def __init__(self, device):
        DeviceBase.__init__(self, device)
        self.pressure = 0
    def getMeasurement(self):
        return self.pressure
    def setPressure(self, pressure):
        self.pressure = pressure

Which looks like this when you test it

>>> base = DeviceBase("/dev/ttyS0")
>>> base
DeviceBase('/dev/ttyS0')
>>> base.getMeasurement()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 5, in getMeasurement
NotImplementedError
>>> base.setPressure(14)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 7, in setPressure
NotImplementedError
>>>
>>> real = RealDevice("/dev/ttyS1")
>>> real
RealDevice('/dev/ttyS1')
>>> real.getMeasurement()
0
>>> real.setPressure(14)
>>> real.getMeasurement()
14
>>> 

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From google at mrabarnett.plus.com  Mon May 11 14:38:03 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 11 May 2009 19:38:03 +0100
Subject: Wrapping comments
In-Reply-To: <4A0857A4.9090108@hughes.net>
References: <towb-EA7906.14423909052009@news.individual.de>
	<4A0857A4.9090108@hughes.net>
Message-ID: <4A08708B.7000002@mrabarnett.plus.com>

norseman wrote:
> Tobias Weber wrote:
>> Hi,
>> the guideline (PEP 8) is hard wrap to 7x characters. The reason given 
>> is that soft wrap makes code illegible.
>>
>> So what if you hard wrap code but let comments and docstrings soft-wrap?
>>
>> Otherwise it's hugely annoying to edit them. Say you remove the first 
>> three words of a 150 character sentence. Either keep the ugly or 
>> rewrap manually.
>>
>> Or are there editors that can do a "soft hard wrap" while keeping 
>> indentation and #comment markers intact?
>>
> 
> =======================
> Paragraph 1:  65 and 72 cols are US typewriter standard 12 and 10 pt
>               respectively. (MSDOS screen, business standard paper, ..)
>               And yes, soft wrap does. Check the hardcopy which wraps
>               code with lots of long lines.
> 
> Paragraph 2:  Comments? I vote no. These are in the code and should
>               conform to helping at that location.
>               Doc_stuff - I vote yes. For the obvious reason that it
>               makes formating the Docs easier AND is to be 'extracted'
>               to a separate file for that purpose in the first place.
> 
> Paragraph 3:  True
> 
> Could you give a short example of what you are referring to in your last 
> paragraph?  I showed this to several friends and got several 'views' as 
> to what is intended.
> 
I think he means something like:

# 65 and 72 cols are US typewriter standard 12 and 10 pt respectively.

when wrapped to 40 gives:

# 65 and 72 cols are US typewriter
# standard 12 and 10 pt respectively.

and when rewrapped to 60 gives:

# 65 and 72 cols are US typewriter standard 12 and 10 pt
# respectively.

Indentation of lines wouldn't be affected, so:

         # 65 and 72 cols are US typewriter standard 12 and 10 pt 
respectively.

when wrapped to 40 gives:

         # 65 and 72 cols are US
         # typewriter standard 12 and 10
         # pt respectively.

and when rewrapped to 60 gives:

         # 65 and 72 cols are US typewriter standard 12 and
         # 10 pt respectively.

> 
> I assume you are NOT intending to use third party programs to write code 
> in but rather to use Python somehow?
> 
> I assume you are intending that the editor add the backslash newline at 
>  appropriate places without causing a word or code break when needed and 
> simply wrapping with indent without breaking the code the rest of the 
> time and doing so in such a fashion that ALL general text editors will 
> be able to display code properly as well as be usable in modifying code?
> Not to mention that the interpreter and/or compiler will still be able 
> to use the file.
> 


From __peter__ at web.de  Mon May 11 14:59:41 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 11 May 2009 20:59:41 +0200
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
Message-ID: <gu9sit$nd4$02$1@news.t-online.com>

Adam Gaskins wrote:

> So I was beginning to learn OOP for PHP, and it seemed to me that abstract
> classes were just right for my application. In my application I must
> communicate with several peices of test equipment that communicate via
> RS-232. Most use SCPI instructions, some do not and require low level
> communication.
> 
> The way I understand abstract classes is that I could have a class that
> has all my abstract methods such as 'init', 'getMeasurement',
> 'setPressure', etc... then I could use this common interface to to control
> my different pieces of hardware (after I write a library for each of
> them).
> 
> Is this a valid application for abstract classes? Or am I making life more
> complicated than it need be?
> 
> Now, I have read that Pythons OOP implimentation is so much better and
> more complete then PHP's, but I cant find anything about abstract classes
> except this:
> http://norvig.com/python-iaq.html
> 
> ...which says it doesn't exist in Python and you can only do this hack to
> make it work (and I don't particularly understand how to impliment it from
> this article).

It is basically a non-implementaton. If you don't understand it you should 
not mess with abstract base classes and work your way through an 
introductory python textbook. 

That said, the page is outdated; Python 2.6 has some support for abstract 
classes. They even fail a bit earlier, when the class is instantiated 
instead of when the method is called. Example:

from abc import ABCMeta, abstractmethod, abstractproperty

class AbstractDevice:
    __metaclass__ = ABCMeta

    @abstractmethod
    def init(self):
        pass

    @abstractproperty
    def pressure(self):
        pass


class Compressor(AbstractDevice):
    def init(self):
        print "starting compressor"

    def set_pressure(self, value):
        print "setting pressure to", value
    pressure = property(fset=set_pressure)

c = Compressor()
c.init()
c.pressure = 42

a = AbstractDevice() # fails with TypeError

 
> This makes me suspect I am making things more comlicated than they need to
> be. Could someone help me understand the proper way to impliment a set
> classes/methods to deal with several peices of similar and not so similar
> hardware? Not looking for anyone to write code for me, just help
> understanding some of these OOP concepts and how they would apply to my
> situation.

Personally I would just write the class I need

class Compressor(object):
    def init(self):
        print "starting compressor"

    def set_pressure(self, value):
        print "setting pressure to", value
    pressure = property(fset=set_pressure)

and forget about the bureaucracy. Instead I recommend that you learn about 
unit tests and write a few tests to ensure your classes work as specified.

Peter



From ken at seehart.com  Mon May 11 15:11:22 2009
From: ken at seehart.com (Ken Seehart)
Date: Mon, 11 May 2009 12:11:22 -0700
Subject: Can I get a value's name
In-Reply-To: <gu9jqb+q7rk@eGroups.com>
References: <gu9jqb+q7rk@eGroups.com>
Message-ID: <4A08785A.6070906@seehart.com>

jalanb3 wrote:
> Context for this question arises from some recent code. In particular the "replace_line" method, which takes in a regexp to look for, and a replacement for when it matches.
>
> It is supposed to work for single lines only (we add ^ and $ to the regexp), so arguments which have '\n' in them are not accepted.
>
> So at start of the method we search for such bad chars, and the code ends up something like this:
>
> def replace_line(pattern,replacement):
>     errors = '\n' in pattern and [ 'pattern' ] or []
>     errors += '\n' in replacement and [ 'replacement' ] or []
>     values = [ locals()[e] for e in errors ]
>     # etc, etc, and eventually:
>     print 'Argument %s is bad : "%s"' % (errors[0],values[0])
>
> And the question arises from that locals() line:
>     Given a variable name I can use locals() to get the value
>     Is there a way to do it the other way round
>         Given the value, can I get the variable name ?
>
> For example, suppose I had started like this (using the variables, not strings with their names)
>
> def replace_line(pattern,replacement):
>     values = '\n' in pattern and [ pattern ] or []
>     values += '\n' in replacement and [ replacement ] or []
>
> Can I later get the name "pattern" via values[0]?
>
> If this was an array in another language:
>     Of course not, values[0] is a copy of the value
>         so the connection to the variable is lost
> But, AFAIK, in Python values[0] is "just a rename" of pattern
>     so there might be a way to get "through to" the original variable
>   
No, values[0] gives a reference to the value stored at index 0 of the 
values array, which does not contain the name.
In particular, the name and all other information about the expression 
itself is lost.  A value generally does not contain the
"pattern" or any kind of name information (although class, method, and 
function instances contain some symbolic information in them).

Study the concept of 'references' and all of this will become more clear.

The only way to do something like what you want would be to search 
globals() or locals() for the value (depending on the context), but that 
would be an extremely ugly hack.  Chances are that if you want to do 
this, you need to rethink the problem instead.

# horribly bad, but sort of working, code follows:

foo = 'find me!'

def find_var(x):
    '''returns the name associated with a value'''
    for k,v in globals().items():
        if v == x:
            return k

print find_var(foo)

Note that a value can have several different names (and unnamed 
references) pointing at it, so the above code is not very general, but 
it may illustrate some interesting points.

My guess is that your entire approach may need rethinking.  What is the 
ultimate objective of your project?
> Thank you for reading this far.
>     If you were now to start writing, I'd be very grateful indeed.
>
>   



From simon at brunningonline.net  Mon May 11 15:23:08 2009
From: simon at brunningonline.net (Simon Brunning)
Date: Mon, 11 May 2009 20:23:08 +0100
Subject: Wrapping comments
In-Reply-To: <towb-63CE3D.09322210052009@news.individual.de>
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
Message-ID: <8c7f10c60905111223k34ef1130n21acc0cc39206fc5@mail.gmail.com>

2009/5/10 Tobias Weber <towb at gmx.net>:
> (still not gonna use software that doesn't let me type # because it's
> alt+3 on a UK layout; having to re-learn or configure that is just sick)

To use Aquamacs with a UK keyboard, you want to select Options, Option
Key, Meta & British. Things just work then.

-- 
Cheers,
Simon B.


From cripplemeal at gmail.com  Mon May 11 15:54:21 2009
From: cripplemeal at gmail.com (cripplemeal at gmail.com)
Date: Mon, 11 May 2009 12:54:21 -0700 (PDT)
Subject: Using Pygame with Python
Message-ID: <e7f4b94c-5e3a-4f2d-80e1-3227b86f14f0@q2g2000vbr.googlegroups.com>

Hi. I would just like to know which of the versions of python and
pygame would be best to download for use together. I am a windows xp
user.


From kyosohma at gmail.com  Mon May 11 16:02:58 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 11 May 2009 13:02:58 -0700 (PDT)
Subject: Writing text to a Word Document
References: <8ba265c9-4697-41b4-a117-04761a86a945@g20g2000vba.googlegroups.com>
Message-ID: <33867bab-9237-4a60-be14-46647522edd9@l28g2000vba.googlegroups.com>

On May 11, 11:27?am, gazath... at gmail.com wrote:
> Hi everyone,
>
> I am trying to write several attributes from a database table and
> using the code below I can write the values however it is only
> overwriting on the first line.
>
> I am new to the win32com bit and I would like to know what is the
> recommended reference to loop down the page and add multiple records
> rather than the worddoc.Content.
>
> I have read a little about writing this to an RTF or htmol but I am
> getting information overload and going nowhere. ?Does anyone have a
> nice tutorial out there that simply explains how to do this?
>
> Much appreciated for any thoughts.
>
> Cheers,
>
> Gareth
>
> import win32com.client, arcgisscripting, sys, os
> gp = arcgisscripting.create(9.3)
>
> #Create word document component -http://www.faqts.com/knowledge_base/view.phtml/aid/37034/fid/244
> wordapp = win32com.client.Dispatch("Word.Application") # Create new
> Word Object
> wordapp.Visible = 1 # Word Application should`t be visible
> worddoc = wordapp.Documents.Add() # Create new Document Object
> worddoc.Content.Font.Size = 11
> worddoc.Content.Paragraphs.TabStops.Add (100)
>
> #Setup of GDB Connection
> # Get the Featureclass from the Mobel - Property Box
> PropBox = "C:\\Avon Fire Rescue\\data\AvonFire_1.gdb\\PropertyBox"
>
> # Make a search cursor for the Property Box Feature class
> PBselCur = gp.searchcursor(PropBox)
> PBrow = PBselCur.reset()
> PBrow = PBselCur.next()
>
> #Using the search cursor get the Premise ID from a Property box
>
> while PBrow:
> ? ? PBrowVal = PBrow.getvalue("PremisesID")
> ? ? #Add data to Word Document
> ? ? worddoc.Content.Text = (PBrowVal)
> ? ? PBrow = PBselCur.next()
>
> #worddoc.Close() # Close the Word Document (a save-Dialog pops up)
>
> print "Fin"

What you probably want is something like this:

rng = worddoc.Range(0,0)
while PBrow:
    rng.InsertAfter(PBrowVal + "\r\n")  # needs return and new line
character

At least, that's what I found in one of my books. It seemed to work
when I tested it in the interpreter.

Mike


From kyosohma at gmail.com  Mon May 11 16:06:49 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 11 May 2009 13:06:49 -0700 (PDT)
Subject: Using Pygame with Python
References: <e7f4b94c-5e3a-4f2d-80e1-3227b86f14f0@q2g2000vbr.googlegroups.com>
Message-ID: <3efb2b2f-60ba-4d70-80de-7f032909cc3c@s28g2000vbp.googlegroups.com>

On May 11, 2:54?pm, cripplem... at gmail.com wrote:
> Hi. I would just like to know which of the versions of python and
> pygame would be best to download for use together. I am a windows xp
> user.

Look at the pygame website to see what the newest version of Python it
supports and go with that unless there are known issues listed. If you
plan to make an executable of the game, then I recommend Python 2.5
since there are some known issues with 2.6 (don't know if that's true
for 3.0 or not, but it's probable).

- Mike


From baudewijn.vermeire at skynet.be  Mon May 11 16:09:15 2009
From: baudewijn.vermeire at skynet.be (bav)
Date: Mon, 11 May 2009 22:09:15 +0200
Subject: how to consume .NET webservice
Message-ID: <4a0885e2$0$2853$ba620e4c@news.skynet.be>

question from a python newbie;

  how can i consume in python language, a .NET web service, passing
  a string array as parameter in some easy steps?

best regards 




From ggardiner at iee.org  Mon May 11 16:19:02 2009
From: ggardiner at iee.org (Geoff Gardiner)
Date: Mon, 11 May 2009 21:19:02 +0100
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
In-Reply-To: <gu9fr2$je5$1@panix3.panix.com>
References: <mailman.5282.1241783298.11746.python-list@python.org>	<gu6i38$jhk$1@panix3.panix.com>	<mailman.5375.1241962005.11746.python-list@python.org>
	<gu9fr2$je5$1@panix3.panix.com>
Message-ID: <4A088836.3080006@iee.org>

Aahz wrote:
> ... That seems to demonstrate that regrtest.py is indeed a good mechanism for
> finding out whether it's a b0rked install!
>   

I agree that regrtest.py looks a good mechanism. It just appears that
`apt-get install python` on Debian and Ubuntu brings no tests with it.

@Lawrence D'Oliveiro:

`apt-get install debsums` does indeed show that the packages that it checks have matching checksums. `debsums [-a] python` checks all sorts of /usr/share/doc/python files while `debsums [-a] python2.5` checks /usr/share/doc/python2.5, /usr/lib/python2.5 and others as well. Although that wasn't what I was originally looking for it has been helpful.

Thank you for your suggestions.

All the best,
Geoff




From namekuseijin at gmail.com  Mon May 11 16:25:03 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Mon, 11 May 2009 17:25:03 -0300
Subject: how to consume .NET webservice
In-Reply-To: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
Message-ID: <gua1j0$tra$1@adenine.netfront.net>

bav escreveu:
> question from a python newbie;
> 
>   how can i consume in python language, a .NET web service, passing
>   a string array as parameter in some easy steps?

Unless Microsoft extended the standard in any way, then it should be 
just as you consume any web service, I guess. ;)

-- 
a game sig: http://tinyurl.com/d3rxz9


From kyosohma at gmail.com  Mon May 11 16:29:16 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 11 May 2009 13:29:16 -0700 (PDT)
Subject: how to consume .NET webservice
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
Message-ID: <a52fe4d1-3d04-4f20-ad14-b6e91a142c7e@g19g2000vbi.googlegroups.com>

On May 11, 3:09?pm, "bav" <baudewijn.verme... at skynet.be> wrote:
> question from a python newbie;
>
> ? how can i consume in python language, a .NET web service, passing
> ? a string array as parameter in some easy steps?
>
> best regards

You're being pretty vague here. Try using Google first...I got plenty
of hits with "python .net web service". This one sounds good:

http://www.beardygeek.com/2009/01/how-to-call-a-net-webservice-using-python/

It sounds like you consume it much like you do with other web
services...find the API and use Python to access it or create a parser
of some sort.

Mike


From agaskins_ng at kelleramerica.com  Mon May 11 16:34:02 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Mon, 11 May 2009 16:34:02 -0400
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
	<slrnh0grfa.8na.nick@irishsea.home.craig-wood.com>
Message-ID: <bZ%Nl.55092$ew.38769@newsfe24.iad>

Wow, thanks Nick! This is just what I was looking for!

Thanks to Peter as well. And as for your suggestion that I probably 
shouldn't mess with things I don't understand and learn the basics first... 
well, that is probably sound advice, but I figured out years ago that I 
learn things best by a) getting in over my head b) panicking a little c) 
sorting it all out, and fianlly d) (in the case of programming) refactoring 
to make it all proper later. It may be bss aackwards but it works for me :-)

I am going to work through these examples in the morning, thanks again guys! 




From tadwelessar at gmail.com  Mon May 11 16:39:26 2009
From: tadwelessar at gmail.com (Matteo)
Date: Mon, 11 May 2009 13:39:26 -0700 (PDT)
Subject: Fill Javascript form
Message-ID: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>

Hi everybody,
I have to fill a web form to authenticate and connect to the internet.
I thought it would have been easy to make a script to do that
automatically
on startup.

Unfortunately, it turned out that the form is written in JavaScript,
and
urllib2 therefore fails to even fetch the form.

The form itself is very simple, just name and password fields and a
"submit"
button.

Do you know of any workaround?


From rogeeff at gmail.com  Mon May 11 16:39:41 2009
From: rogeeff at gmail.com (rogeeff at gmail.com)
Date: Mon, 11 May 2009 13:39:41 -0700 (PDT)
Subject: How to replace constructor with factory method
Message-ID: <630cbc45-9809-45c8-addd-c229cd2d07d9@e23g2000vbe.googlegroups.com>

Hi,

Just wonder if it's possible in Python.

what I want is to tweak an existing Python class A with no
constructor, so that A() results in fuctory method call?

so o = A() instead being equivalent to:

s = object()
A.__init__(s)
o = s

becomes:

o = my_factory_function( A )

Thanks,

Gennadiy


From gabriel at opensuse.org  Mon May 11 16:40:57 2009
From: gabriel at opensuse.org (Gabriel)
Date: Mon, 11 May 2009 17:40:57 -0300
Subject: issue with twisted and reactor. Can't stop reactor
Message-ID: <1adde6890905111340o7ca2b19er762a76518eac9d05@mail.gmail.com>

Hello all!,

I'm trying to implement a simple one way communication using twisted.

Sender:
> send message
> close connection

Receiver:
> receive
> do something
> wait for other message

I'm testing with this simple examples:
Sender:
[code]
class SenderClient(protocol.Protocol):

    def __init__(self, data):
        self.data = data

    def connectionMade(self):
        self.transport.write(self.data)

    def dataReceived(self, data):
        self.transport.loseConnection()

    def connectionLost(self, reason):
        pass

class SenderFactory(protocol.ClientFactory):

    def __init__(self, data):
        self.data = data

    def buildProtocol(self, addr):
        return SenderClient(self.data)

    def clientConnectionFailed(self, connector, reason):
        logger.error("Connection failed. Reason %s" % reason)
        reactor.stop()

    def clientConnectionLost(self, connector, reason):
        reactor.stop()

class Sender(object):

    def __init__(self, host='localhost', port=61610):
        self.host = host
        self.port = port

    def send(self, data):
        reactor.connectTCP(self.host, self.port, SenderFactory(data))
        reactor.run()
[/code]

Receiver:
[code]
from twisted.internet import reactor, protocol

class Receiver(protocol.Protocol):

    def dataReceived(self, data):
        self.transport.write("success")
        print data

def main():
    factory = protocol.ServerFactory()
    factory.protocol = Receiver
    reactor.listenTCP(61610,factory)
    reactor.run()

if __name__ == '__main__':
    main()
[/code]

When I call send the first time it works fine, when I call send a
second time the sender hangs.
If I hit ctrl+c it throws:

[quote]
.../twisted/internet/base.py", line 527, in stop
    "Can't stop reactor that isn't running.")
twisted.internet.error.ReactorNotRunning: Can't stop reactor that isn't running.
[/quote]

Any idea why this is happening?
King regards.


From sam at tregar.com  Mon May 11 16:44:08 2009
From: sam at tregar.com (Sam Tregar)
Date: Mon, 11 May 2009 16:44:08 -0400
Subject: Your Favorite Python Book
Message-ID: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>

Greetings.  I'm working on learning Python and I'm looking for good books to
read.  I'm almost done with Dive into Python and I liked it a lot. I found
Programming Python a little dry the last time I looked at it, but I'm more
motivated now so I might return to it.  What's your favorite?  Why?

-sam
-------------- next part --------------
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From Shawn at Milochik.com  Mon May 11 17:00:21 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Mon, 11 May 2009 17:00:21 -0400
Subject: Your Favorite Python Book
In-Reply-To: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
Message-ID: <2dc0c81b0905111400k4b3876cdj80f500d30ff8660d@mail.gmail.com>

It depends on what you want to do. If you still want to beef up on
general knowledge, maybe skim through "The Python Cookbook" or
something reference-like.

If you feel ready to start doing something with Python, look into one
of the recent titles that applies Python for a specific purpose.
Examples:

"Gray Hat Python" (debugging, reverse engineering)
"Natural Language Processing with Python" (pre-order at this time)
Any up-to-date (version 1.0 and up) Django book (if you're into Web development)
"Expert Python Programming" (best practices)
"Beginning Python Visualization" (presenting data visually)
"Programming Collective Intelligence" (extracting valuable information
from public data sources, and more)

Shawn


From Shawn at Milochik.com  Mon May 11 17:06:52 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Mon, 11 May 2009 17:06:52 -0400
Subject: Fill Javascript form
In-Reply-To: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>
References: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>
Message-ID: <2dc0c81b0905111406u6be0bb11nc5a0cb239dce909e@mail.gmail.com>

How is the form "written in JavaScript"? Is it dynamically generated?

In any case, can you just send a POST request if you know the values required?


From rtw at freenet.co.uk  Mon May 11 17:07:42 2009
From: rtw at freenet.co.uk (Rob Williscroft)
Date: Mon, 11 May 2009 16:07:42 -0500
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
Message-ID: <Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>

gert wrote in news:d7591495-4661-4243-ad7e-f142d8244e88
@e24g2000vbe.googlegroups.com in comp.lang.python:

> I am trying to do this in a single transaction, the 3 separate
> statements work fine, but i am screwed if they are not executed
> together.

Well you're in luck, Python DBAPI 2 connections handle this 
for you, you do need to call commit() on the connection though.

The default, for DBAPI 2 connections, is that all "work" occurs in a 
transaction (if the DB actually supports transactions) so you have to
call commit() on the connection after doing updates.

> 
>  ########### db.execute('BEGIN') #############
>  db.execute('UPDATE users SET uid=? WHERE uid=?',(v['uid'],s.UID))

This is a fragile way to do it, your code won't work with a DB that
has real foreign keys (and maybe sqlite will get them one day).

A less fragile way of doing it is:

db = connection.cursor()

# First copy the row if it exists

db.execute( '''
    	insert into "users"
    	select ?, "name", adress, city, country, phone, picture
    	from "users" where "uid" = ?    	
    ''', (v['uid'],s.UID)
  )

>  db.execute('UPDATE sessions SET uid=? WHERE sid=?',(v['uid'],s.SID))

# Second update foriegn key tables to point to the new row
# (but only if the new row exists )

db.execute( '''
    	update "sessions" set "uid" = ?
    	where "uid" = ? 
    	and exists(
    	    	select * from "users" where "uid" = ?
    	  )
    ''',
    (v['uid'],s.SID, v['uid']) 
  )

#Do the same for the "groups" table, then

# finally delete the original row (again only if the new row exists )

db.execute( '''
    	delete from "users" 
    	where "uid" = ?
    	and exists(
    	    	select * from "users" where "uid" = ?
    	  )
    ''',
    (s.SID, v['uid']) 
  )

# Finally commit the transaction

connection.commit()

>  # only do this if there is no primary key conflict in the above
>  if db.ERROR == None: db.execute('UPDATE groups SET uid=? WHERE uid=?',
> (v['uid'],s.UID))

Python reports errors by throwing exceptions, so if you needed somthing
like this it would more likely be:

try:
  
  ... # somthing that errors up ...

catch sqlite3.DatabaseError:
  connection.rollback()

Rob.
-- 
http://www.victim-prime.dsl.pipex.com/


From clp2 at rebertia.com  Mon May 11 17:08:13 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 11 May 2009 14:08:13 -0700
Subject: How to replace constructor with factory method
In-Reply-To: <630cbc45-9809-45c8-addd-c229cd2d07d9@e23g2000vbe.googlegroups.com>
References: <630cbc45-9809-45c8-addd-c229cd2d07d9@e23g2000vbe.googlegroups.com>
Message-ID: <50697b2c0905111408n41450ecek34ec24cbe439254f@mail.gmail.com>

On Mon, May 11, 2009 at 1:39 PM,  <rogeeff at gmail.com> wrote:
> Hi,
>
> Just wonder if it's possible in Python.
>
> what I want is to tweak an existing Python class A with no
> constructor, so that A() results in fuctory method call?
>
> so o = A() instead being equivalent to:
>
> s = object()
> A.__init__(s)
> o = s
>
> becomes:
>
> o = my_factory_function( A )

I believe you'd need to override __new__ for that.
Docs on __new__: http://docs.python.org/reference/datamodel.html#object.__new__

Cheers,
Chris
-- 
http://blog.rebertia.com


From usernet at ilthio.net  Mon May 11 17:12:30 2009
From: usernet at ilthio.net (Tim Harig)
Date: Mon, 11 May 2009 21:12:30 GMT
Subject: [silly] Re: issue with twisted and reactor. Can't stop reactor
References: <mailman.0.1242074479.8015.python-list@python.org>
Message-ID: <2x0Ol.29775$YU2.5233@nlpi066.nbdc.sbc.com>

On 2009-05-11, Gabriel <gabriel at opensuse.org> wrote:
> Subject: issue with twisted and reactor. Can't stop reactor

Not having written anything using twisted I cannot help you much with your
code; but, I cannot resist commenting about your subject line:

I suspect that if are having an issue with your reactor after being hit by
a twister[d], then you probably have more at issue then your networking.
My suggestion would be to run or drive away quickly.


From rumpf_a at web.de  Mon May 11 17:19:01 2009
From: rumpf_a at web.de (rumpf_a at web.de)
Date: Mon, 11 May 2009 14:19:01 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<f964488e-eb74-44b8-a6e8-760d29192cb1@e24g2000vbe.googlegroups.com>
Message-ID: <2cf5a78f-87da-4ace-b895-6c8283302b22@o20g2000vbh.googlegroups.com>

On 10 Mai, 07:36, k... at fiber-space.de wrote:
> On 8 Mai, 17:48, Andreas Rumpf <Rump... at web.de> wrote:
>
> > Dear Python-users,
>
> > I invented a new programming language called "Nimrod" that combines Python's readability with C's performance. Please check it out:http://force7.de/nimrod/
> > Any feedback is appreciated.
>
> > Regards,
> > Andreas Rumpf
>
> > ______________________________________________________
> > GRATIS f?r alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!
> > Jetzt freischalten unterhttp://movieflat.web.de
>
> On a first impression it looks quite pleasant to me, your new
> language! Two obvious questions on a Python list.
>
> 1) How to interface with Nimrod from Python?
> 2) Lack of typed hash-tables. Is this one of those particular features
> that are planned to be implemented in version 0.80 and summarized
> under "generic containers"?

1) Via a wrapper that is in the works. It will work like embedding
Python into a C application.
2) Yes. Some syntactic sugar will probably be provided, e.g. a
constructor {} like Python. However, I have not made my mind
completely: Maybe they should be built-in? This would allow more
optimizations.


From kyrie at uh.cu  Mon May 11 17:26:49 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Mon, 11 May 2009 17:26:49 -0400
Subject: How to replace constructor with factory method
In-Reply-To: <630cbc45-9809-45c8-addd-c229cd2d07d9@e23g2000vbe.googlegroups.com>
References: <630cbc45-9809-45c8-addd-c229cd2d07d9@e23g2000vbe.googlegroups.com>
Message-ID: <200905111726.49772.kyrie@uh.cu>

On Monday 11 May 2009 04:39:41 pm rogeeff at gmail.com wrote:

> so o = A() instead being equivalent to:
>
> s = object()
> A.__init__(s)
> o = s

Actually, it would be more like this:

s = A.__new__(A)
if isinstance(s,A):
    A.__init__(s)
o = s

> o = my_factory_function( A )

You could tweak:
*) A's constructor (__new__) [keep in mind the 'insinstance' part]
*) A's initializer (changing the type, and so on... ugly, fragile and 
dangerous, don't ever do it!)
*) A's metaclass (the instantiation happens in the metaclass' __call__ method,
you could rewrite it to suit your needs, as in [1]
*) or, just use a method named A instead of the A class (as the 
multiprocessing.Queue function does)

I would use the 4th option. The fact that python classes are callable allows 
you to switch from instantiation to function calling without having to change 
the user's code.


[1] http://trucosos.crv.matcom.uh.cu/snippets/95/

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From samwyse at gmail.com  Mon May 11 17:44:03 2009
From: samwyse at gmail.com (samwyse)
Date: Mon, 11 May 2009 14:44:03 -0700 (PDT)
Subject: creating classes with mix-ins
References: <d6409bb3-f2ed-4964-942a-b0698060a7f0@e24g2000vbe.googlegroups.com>
Message-ID: <09108020-503e-44ae-acee-943374300e18@e24g2000vbe.googlegroups.com>

On May 11, 1:16?pm, samwyse <samw... at gmail.com> wrote:
> I'm writing a class that derives it's functionality from mix-ins.

While waiting, I gave a try at using class decorators.  Here's what I
came up with:

def add_methods(*m_list, **kwds):
    def wrapper(klass):
        for m_name in m_list:
            def template(self, which, username, password, *args):
                if not self.security.isAuthorised(username, password,
which, m_name):
                    raise Exception('Unauthorised access')
                return getattr(self.blog, m_name)(which, *args)
            dotted_name = kwds.get('prefix', '') + m_name
            template.__name__ = dotted_name
            template.__doc__ = dotted_name
            setattr(klass, dotted_name, template)
        return klass
    return wrapper

@add_methods('newPost', 'editPost', 'getPost', 'newMediaObject',
             'getCategories', 'getRecentPosts',
             prefix='metaWeblog.')
class MetaWeblog(object):
    def __init__(self,
                 securityHandler=SimpleSecurityHandler,
                 blogHandler=SimpleBlogHandler):
        self.security = securityHandler()
        self.blog = blogHandler()

if __name__ == '__main__':
    server = SimpleXMLRPCServer(("localhost", 8080))
    server.register_instance(MetaWeblog())
    server.register_introspection_functions()
    server.serve_forever()

The problem that I'm having is that when I call newPost,
SimpleBlogHandler.getRecentPosts gets invoked.  Apparently add_methods
isn't generating unique templates.  I think I need to move 'template'
into another function, but I'm starting to wonder if metaclasses might
work better.  Any ideas?


From clp2 at rebertia.com  Mon May 11 17:45:37 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 11 May 2009 14:45:37 -0700
Subject: Your Favorite Python Book
In-Reply-To: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
Message-ID: <50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>

On Mon, May 11, 2009 at 1:44 PM, Sam Tregar <sam at tregar.com> wrote:
> Greetings.? I'm working on learning Python and I'm looking for good books to
> read.? I'm almost done with Dive into Python and I liked it a lot. I found
> Programming Python a little dry the last time I looked at it, but I'm more
> motivated now so I might return to it.? What's your favorite?? Why?

I like "Python in a Nutshell" as a reference book, although it's now
slightly outdated given Python 3.0's release (the book is circa 2.5).

Cheers,
Chris
-- 
http://blog.rebertia.com


From python at bdurham.com  Mon May 11 17:52:41 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 11 May 2009 17:52:41 -0400
Subject: Your Favorite Python Book
In-Reply-To: <50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>
Message-ID: <1242078761.3662.1314940065@webmail.messagingengine.com>

Sam,

In no specific order (I brought them all):

Wesley Chun's "Core Python Programming"
David Mertz's "Text Processing in Python" (older, but excellent)
Mark Lutz's "Learning Python"

All highly recommended.

Best of luck on your Python journey!

Regards,
Malcolm


From rumpf_a at web.de  Mon May 11 17:55:46 2009
From: rumpf_a at web.de (rumpf_a at web.de)
Date: Mon, 11 May 2009 14:55:46 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
Message-ID: <57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>

On 10 Mai, 10:40, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> Andreas Rumpf <Rump... at web.de> writes:
> > I invented a new programming language called "Nimrod" that combines
> > Python's readability with C's performance. Please check it out:
> >http://force7.de/nimrod/Any feedback is appreciated.
>
> Looks nice in many ways. ?You also know about PyPy and Felix
> (felix.sf.net)?
>
Nimrod has very different goals from PyPy, I cannot comment on Felix.

> It seems a little bit hackish that the character type is a byte.
> Python did something like that but it ended up causing a lot of
> hassles when dealing with real Unicode. ?I think you have to bite
> the bullet and have separate byte and char types, where char=unicode.
>
I am dissatisfied with Python's (or Java's) Unicode handling:
1) IO overhead to convert UTF-8 (defacto standard on UNIX) into
UTF-16.
2) For simple tasks the output file will be in the same encoding as
the input file automatically.
3) Most text files have no header specifying the encoding anyway. How
should the programm/programmer know? And often he does not need to
know anyway.
4) UTF-16 (or 32) use more memory.
5) In particular using UTF-16 internally does not make sense: It just
encourages programmers to ignore surrogates. Unicode has more than
2^16 characters nowadays.

> It scares me a little about how there are references that can have
> naked pointers, escape the gc, etc. ?It would be good if the type
> system were powerful enough to guarantee the absence of these effects
> in some piece of data, unless the data is somehow marked with an
> "unsafe" type.
>
Well "ptr" is unsafe, "ref" is not; mixing the two requires a "cast".
Basically "cast" is the only unsafe feature.

> I'd like to see ML-like algebraic types with pattern matching, not
> just tuple unpacking. ?
>
Me too.

> The generic system should be able to analyze the AST of type
> parameters, e.g. iterator<T> would be able to automatically generate
> an iterator over a list, a tree, or some other type of structure, by
> actually figuring out at compile time how T is constructed.
>
Interesting idea. Right now the generic iterator is named "items" and
can be overloaded for user-defined types.

> It's sort of surprising that the compiler is written in a Pascal
> subset. ?Why not implement in Nimrod directly, and bootstrap through C?
>
That is already the case: The Pascal version is translated to Nimrod
and than compiles itself. Bootstrapping works.

> The language and library are missing arbitrary precision integer
> arithmetic, using GMP or something like that.
>
True, but currently not a high priority for me.

> It would be good to also be able to have value serialization and
> deserialization to both human readable (nested lists, etc) and binary
> (for IPC) formats.
>
Yes. Planned for version 0.9.0.

> It's not obvious from the blurbs whether simple functional programming
> is supported, e.g. how would you implement a function like "map" or
> "filter"? ?What would the types be of those two functions?
>
proc map[T, S](data: openarray[T], op: proc(x: T): S): seq[S] =
  result = @[]
  for d in items(data): result.add(op(d))

Or - if you don't want the "openarray[T]" restriction:
proc map[T, S, U](data: T, op: proc(x: U): S): seq[S] =
  result = @[]
  for d in items(data): result.add(op(d))


> The roadmap says you might implement threading with transactional
> memory. ?How will the transactional memory interact with mutable data?
> Are you going to use OS threads, lightweight threads, or both?
Probably both. Lightweight threads could be done using coroutines and
explicit task switching. OS threads with transactional memory. The
plan is to use LLVM as a backend and perhaps http://tinystm.org/. Of
course, this is only wishful thinking. ;-)


From toby at tobiah.org  Mon May 11 17:59:43 2009
From: toby at tobiah.org (Tobiah)
Date: Mon, 11 May 2009 14:59:43 -0700
Subject: There may be a much better way to manage artillery.
References: <_5JNl.4895$qP.3696@newsfe03.iad>
	<mailman.5399.1241999311.11746.python-list@python.org>
Message-ID: <pan.2009.05.11.21.59.43.372232@tobiah.org>

On Mon, 11 May 2009 00:48:25 +0100, Rhodri James wrote:

> On Mon, 11 May 2009 00:06:34 +0100, Tobiah <toby at tobiah.org> wrote:
> 
> [Snippety snip]
> 
>> I wanted the bullets to be responsible for destroying themselves, but a
>> little Googling brought me to points about dangling references and how
>> an object is not allowed (nor does it seem to have the means) to destroy
>> itself. That's why I made this wrapper class for all of the bullets.
> 
> An object can, however, erase its representation from the screen and tell
> whatever control system is keeping track of objects to forget about it. 
> Once the last reference to the object is deleted, the object will be
> garbage collected.
> 
> What framework are you writing your game in?  Pygame has facilities for
> handling this sort of thing fairly straightforwardly.

Actually I am using Pygame, although I'm quite new to it.  Which
module has the facilities that you describe?

Thanks,

Toby


From exarkun at divmod.com  Mon May 11 18:09:19 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 11 May 2009 18:09:19 -0400
Subject: issue with twisted and reactor. Can't stop reactor
In-Reply-To: <1adde6890905111340o7ca2b19er762a76518eac9d05@mail.gmail.com>
Message-ID: <20090511220919.21531.119723250.divmod.quotient.19655@henry.divmod.com>

On Mon, 11 May 2009 17:40:57 -0300, Gabriel <gabriel at opensuse.org> wrote:
>Hello all!,
>
>I'm trying to implement a simple one way communication using twisted.
>
> [snip]
>
>When I call send the first time it works fine, when I call send a
>second time the sender hangs.
> [snip]

None of the reactors in Twisted are restartable.  You can run and stop them
once.  After you've stopped a reactor, you cannot run it again.  This is the
cause of your problem.

Jean-Paul


From rumpf_a at web.de  Mon May 11 18:26:14 2009
From: rumpf_a at web.de (rumpf_a at web.de)
Date: Mon, 11 May 2009 15:26:14 -0700 (PDT)
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.5390.1241977162.11746.python-list@python.org>
Message-ID: <d201b2cb-4b13-4970-a44b-9be1b553e293@j12g2000vbl.googlegroups.com>

> One question I ask myself upon seeing a new language is if it is possible
> to program amb (amb=ambiguous) operator in it. This page gives a very
> nice, "code first" explanation of amb and how it is supposed to work:
>
> http://www.randomhacks.net/articles/2005/10/11/amb-operator
>
Hm. I am not sure either. To me, it looks like a constraint solver by
using brute force. It seems to require continuations. AFAIK
continuations are extremely hard to implement efficiently, so probably
it won't be done in Nimrod.


From rhodri at wildebst.demon.co.uk  Mon May 11 18:39:51 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 11 May 2009 23:39:51 +0100
Subject: There may be a much better way to manage artillery.
In-Reply-To: <pan.2009.05.11.21.59.43.372232@tobiah.org>
References: <_5JNl.4895$qP.3696@newsfe03.iad>
	<mailman.5399.1241999311.11746.python-list@python.org>
	<pan.2009.05.11.21.59.43.372232@tobiah.org>
Message-ID: <op.utsekphla8ncjz@gnudebst>

On Mon, 11 May 2009 22:59:43 +0100, Tobiah <toby at tobiah.org> wrote:

> On Mon, 11 May 2009 00:48:25 +0100, Rhodri James wrote:
>
>> On Mon, 11 May 2009 00:06:34 +0100, Tobiah <toby at tobiah.org> wrote:
>>
>> [Snippety snip]
>>
>>> I wanted the bullets to be responsible for destroying themselves, but a
>>> little Googling brought me to points about dangling references and how
>>> an object is not allowed (nor does it seem to have the means) to  
>>> destroy
>>> itself. That's why I made this wrapper class for all of the bullets.
>>
>> An object can, however, erase its representation from the screen and  
>> tell
>> whatever control system is keeping track of objects to forget about it.
>> Once the last reference to the object is deleted, the object will be
>> garbage collected.
>>
>> What framework are you writing your game in?  Pygame has facilities for
>> handling this sort of thing fairly straightforwardly.
>
> Actually I am using Pygame, although I'm quite new to it.  Which
> module has the facilities that you describe?

Looking at the code, it's not quite as straightforward as I was making
out!  I'm used to writing games using a veneer library which has a
Screen class that handles all the basic drawing functions and the main
processing loop.  It keeps a list of objects, and is responsible for
calling appropriate methods on those objects when things happen.
The Object class has a destroy() method which erases the object and
asks the Screen to remove it from its internal list.  Needless to
say there is a lot of list copying going on in the Screen class
main loop to make sure that lists aren't corrupted as they are being
iterated through.

This code was written back in the days of Python 2.1, and hasn't had
more than simple bug-fixing done to it since.  We're contemplating a
rewrite when we shift to Python 3, and we're putting that decision
off as long as possible :-)  You're welcome to use or scavenge from
it, as it's on a fairly free license.  It's available here:

   http://www.livewires.co.uk/python/home

(though apparently I must go and bug the webmaster about putting the
latest version of the worksheets up.  What's there at the moment is
years out of date!)

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From deets at nospam.web.de  Mon May 11 18:40:05 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 12 May 2009 00:40:05 +0200
Subject: how to consume .NET webservice
In-Reply-To: <gua1j0$tra$1@adenine.netfront.net>
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net>
Message-ID: <76rnq5F1dp6gpU1@mid.uni-berlin.de>

namekuseijin schrieb:
> bav escreveu:
>> question from a python newbie;
>>
>>   how can i consume in python language, a .NET web service, passing
>>   a string array as parameter in some easy steps?
> 
> Unless Microsoft extended the standard in any way, then it should be 
> just as you consume any web service, I guess. ;)

Microsoft *created* the standard.. .and how feasible it is to work with 
it, see this :

http://72.249.21.88/nonintersecting/?year=2006&monthnum=11&day=15&name=the-s-stands-for-simple&page=

Diez


From mensanator at aol.com  Mon May 11 18:40:49 2009
From: mensanator at aol.com (Mensanator)
Date: Mon, 11 May 2009 15:40:49 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
Message-ID: <4519cc9d-f765-4f55-81b2-58abfa20b988@p4g2000vba.googlegroups.com>

On May 11, 4:55?pm, rump... at web.de wrote:
> On 10 Mai, 10:40, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:> Andreas Rumpf <Rump... at web.de> writes:
> > > I invented a new programming language called "Nimrod" that combines
> > > Python's readability with C's performance. Please check it out:
> > >http://force7.de/nimrod/Anyfeedback is appreciated.
>
> > Looks nice in many ways. ?You also know about PyPy and Felix
> > (felix.sf.net)?
>
> Nimrod has very different goals from PyPy, I cannot comment on Felix.
>
> > It seems a little bit hackish that the character type is a byte.
> > Python did something like that but it ended up causing a lot of
> > hassles when dealing with real Unicode. ?I think you have to bite
> > the bullet and have separate byte and char types, where char=unicode.
>
> I am dissatisfied with Python's (or Java's) Unicode handling:
> 1) IO overhead to convert UTF-8 (defacto standard on UNIX) into
> UTF-16.
> 2) For simple tasks the output file will be in the same encoding as
> the input file automatically.
> 3) Most text files have no header specifying the encoding anyway. How
> should the programm/programmer know? And often he does not need to
> know anyway.
> 4) UTF-16 (or 32) use more memory.
> 5) In particular using UTF-16 internally does not make sense: It just
> encourages programmers to ignore surrogates. Unicode has more than
> 2^16 characters nowadays.
>
> > It scares me a little about how there are references that can have
> > naked pointers, escape the gc, etc. ?It would be good if the type
> > system were powerful enough to guarantee the absence of these effects
> > in some piece of data, unless the data is somehow marked with an
> > "unsafe" type.
>
> Well "ptr" is unsafe, "ref" is not; mixing the two requires a "cast".
> Basically "cast" is the only unsafe feature.
>
> > I'd like to see ML-like algebraic types with pattern matching, not
> > just tuple unpacking. ?
>
> Me too.
>
> > The generic system should be able to analyze the AST of type
> > parameters, e.g. iterator<T> would be able to automatically generate
> > an iterator over a list, a tree, or some other type of structure, by
> > actually figuring out at compile time how T is constructed.
>
> Interesting idea. Right now the generic iterator is named "items" and
> can be overloaded for user-defined types.
>
> > It's sort of surprising that the compiler is written in a Pascal
> > subset. ?Why not implement in Nimrod directly, and bootstrap through C?
>
> That is already the case: The Pascal version is translated to Nimrod
> and than compiles itself. Bootstrapping works.
>
> > The language and library are missing arbitrary precision integer
> > arithmetic, using GMP or something like that.
>
> True, but currently not a high priority for me.

Too bad. That makes Nimrod officially "worthless", i.e., of no
value to me.

>
> > It would be good to also be able to have value serialization and
> > deserialization to both human readable (nested lists, etc) and binary
> > (for IPC) formats.
>
> Yes. Planned for version 0.9.0.
>
> > It's not obvious from the blurbs whether simple functional programming
> > is supported, e.g. how would you implement a function like "map" or
> > "filter"? ?What would the types be of those two functions?
>
> proc map[T, S](data: openarray[T], op: proc(x: T): S): seq[S] =
> ? result = @[]
> ? for d in items(data): result.add(op(d))
>
> Or - if you don't want the "openarray[T]" restriction:
> proc map[T, S, U](data: T, op: proc(x: U): S): seq[S] =
> ? result = @[]
> ? for d in items(data): result.add(op(d))
>
> > The roadmap says you might implement threading with transactional
> > memory. ?How will the transactional memory interact with mutable data?
> > Are you going to use OS threads, lightweight threads, or both?
>
> Probably both. Lightweight threads could be done using coroutines and
> explicit task switching. OS threads with transactional memory. The
> plan is to use LLVM as a backend and perhapshttp://tinystm.org/. Of
> course, this is only wishful thinking. ;-)



From ljqyhvrl at glvn84004389.net  Mon May 11 18:50:59 2009
From: ljqyhvrl at glvn84004389.net (Raoul Gough)
Date: Mon, 11 May 2009 23:50:59 +0100
Subject: MacPython 3.0.1 installation problem, no /usr/local/bin/python*
References: <m2vdoad6fd.fsf@yahoo.co.uk>
	<ec96e1390905090735p40bd6c21w5606c521c4c161e5@mail.gmail.com>
	<mailman.5368.1241929710.11746.python-list@python.org>
Message-ID: <m2fxfbdzjg.fsf@yahoo.co.uk>

Ned Deily <nad at acm.org> writes:

> In article 
> <ec96e1390905090735p40bd6c21w5606c521c4c161e5 at mail.gmail.com>,
>  Benjamin Kaplan <benjamin.kaplan at case.edu> wrote:
>> On Sat, May 9, 2009 at 4:30 AM, Raoul Gough
>> <bvdmyrby at jyxk16274849.net> wrote:
[snip]
>> > So did something go wrong with the installer, or is it all
>> > supposed to work somehow differently?
>> 
>> Because Python 3 breaks compatibility with Python 2, the installers
>> don't install it as the default. The executable should be at
>> /usr/local/bin/python3.0
>
> By default, the 3.0.1 installer does not install any links in
> /usr/local/bin.  To do so, run or re-run the installer, click
> Customize, and then select the "UNIX command-line tools" package.
> That creates /usr/local/python3.0 and /usr/local/python links, among
> others.

Ah, I see! Thanks, I missed the "Customize" option during the install
dialogues. That takes care of the symlinks in /usr/local/bin, although
I notice that it still leaves some dangling symlinks under
/Library/Frameworks/Python.framework that point to a nonexistent
"Current" directory. I guess it's safe to ignore these.

-- 
Raoul Gough.


From gabriel at opensuse.org  Mon May 11 18:51:50 2009
From: gabriel at opensuse.org (Gabriel)
Date: Mon, 11 May 2009 19:51:50 -0300
Subject: issue with twisted and reactor. Can't stop reactor
In-Reply-To: <20090511220919.21531.119723250.divmod.quotient.19655@henry.divmod.com>
References: <20090511220919.21531.119723250.divmod.quotient.19655@henry.divmod.com>
Message-ID: <4A08AC06.6030708@opensuse.org>

Jean-Paul Calderone escribi?:
 > None of the reactors in Twisted are restartable.  You can run and
stop them
> once.  After you've stopped a reactor, you cannot run it again.  This is
> the
> cause of your problem.
> 
> Jean-Paul

I see.
Is it possible to do what I want using twisted? or
I should found another way?

-- 
Kind regards.


From rhodri at wildebst.demon.co.uk  Mon May 11 18:53:20 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 11 May 2009 23:53:20 +0100
Subject: Wrapping comments
In-Reply-To: <towb-B9F4E2.09394811052009@news.individual.de>
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
	<mailman.5400.1242000728.11746.python-list@python.org>
	<towb-B9F4E2.09394811052009@news.individual.de>
Message-ID: <op.utse66qna8ncjz@gnudebst>

On Mon, 11 May 2009 08:39:48 +0100, Tobias Weber <towb at gmx.net> wrote:

> In article <mailman.5400.1242000728.11746.python-list at python.org>,
>  "Rhodri James" <rhodri at wildebst.demon.co.uk> wrote:
>
>> What on earth are you talking about?  '#' has its own key on a UK layout
>
> Not on Apple keyboards, and the emacs release in question is Mac only.

My commiserations.  That was a bad design decision on so many levels.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gert.cuykens at gmail.com  Mon May 11 18:59:49 2009
From: gert.cuykens at gmail.com (gert)
Date: Mon, 11 May 2009 15:59:49 -0700 (PDT)
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
Message-ID: <86fd1d41-2e7d-4b91-a9fc-8a9f4c05e119@e20g2000vbc.googlegroups.com>

On 11 mei, 23:07, Rob Williscroft <r... at freenet.co.uk> wrote:
> gert wrote in news:d7591495-4661-4243-ad7e-f142d8244e88
> @e24g2000vbe.googlegroups.com in comp.lang.python:
>
> > I am trying to do this in a single transaction, the 3 separate
> > statements work fine, but i am screwed if they are not executed
> > together.
>
> Well you're in luck, Python DBAPI 2 connections handle this
> for you, you do need to call commit() on the connection though.
>
> The default, for DBAPI 2 connections, is that all "work" occurs in a
> transaction (if the DB actually supports transactions) so you have to
> call commit() on the connection after doing updates.
>
>
>
> > ?########### db.execute('BEGIN') #############
> > ?db.execute('UPDATE users SET uid=? WHERE uid=?',(v['uid'],s.UID))
>
> This is a fragile way to do it, your code won't work with a DB that
> has real foreign keys (and maybe sqlite will get them one day).
>
> A less fragile way of doing it is:
>
> db = connection.cursor()
>
> # First copy the row if it exists
>
> db.execute( '''
> ? ? ? ? insert into "users"
> ? ? ? ? select ?, "name", adress, city, country, phone, picture
> ? ? ? ? from "users" where "uid" = ? ? ? ? ?
> ? ? ''', (v['uid'],s.UID)
> ? )
>
> > ?db.execute('UPDATE sessions SET uid=? WHERE sid=?',(v['uid'],s.SID))
>
> # Second update foriegn key tables to point to the new row
> # (but only if the new row exists )
>
> db.execute( '''
> ? ? ? ? update "sessions" set "uid" = ?
> ? ? ? ? where "uid" = ?
> ? ? ? ? and exists(
> ? ? ? ? ? ? ? ? select * from "users" where "uid" = ?
> ? ? ? ? ? )
> ? ? ''',
> ? ? (v['uid'],s.SID, v['uid'])
> ? )
>
> #Do the same for the "groups" table, then
>
> # finally delete the original row (again only if the new row exists )
>
> db.execute( '''
> ? ? ? ? delete from "users"
> ? ? ? ? where "uid" = ?
> ? ? ? ? and exists(
> ? ? ? ? ? ? ? ? select * from "users" where "uid" = ?
> ? ? ? ? ? )
> ? ? ''',
> ? ? (s.SID, v['uid'])
> ? )
>
> # Finally commit the transaction
>
> connection.commit()
>
> > ?# only do this if there is no primary key conflict in the above
> > ?if db.ERROR == None: db.execute('UPDATE groups SET uid=? WHERE uid=?',
> > (v['uid'],s.UID))
>
> Python reports errors by throwing exceptions, so if you needed somthing
> like this it would more likely be:
>
> try:
>
> ? ... # somthing that errors up ...
>
> catch sqlite3.DatabaseError:
> ? connection.rollback()
>
> Rob.
> --http://www.victim-prime.dsl.pipex.com/

ok go it, thanks


From Shawn at Milochik.com  Mon May 11 19:35:44 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Mon, 11 May 2009 19:35:44 -0400
Subject: Your Favorite Python Book
In-Reply-To: <1242078761.3662.1314940065@webmail.messagingengine.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>
	<1242078761.3662.1314940065@webmail.messagingengine.com>
Message-ID: <2dc0c81b0905111635x5a598d8bh74e4f7fa76e20b33@mail.gmail.com>

On Mon, May 11, 2009 at 5:52 PM,  <python at bdurham.com> wrote:
> Sam,
>
> In no specific order (I brought them all):
>
> Wesley Chun's "Core Python Programming"
> David Mertz's "Text Processing in Python" (older, but excellent)
> Mark Lutz's "Learning Python"
>
> All highly recommended.
>
> Best of luck on your Python journey!
>
> Regards,
> Malcolm
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I second the Wesley Chun recommendation wholeheartedly. Also, "Text
Processing in Python" is available for free online.

http://gnosis.cx/TPiP/

Shawn


From http  Mon May 11 19:45:58 2009
From: http (Paul Rubin)
Date: 11 May 2009 16:45:58 -0700
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org>
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
Message-ID: <7x4ovrkxu1.fsf@ruckus.brouhaha.com>

rumpf_a at web.de writes:
> I am dissatisfied with Python's (or Java's) Unicode handling:
> 1) IO overhead to convert UTF-8 (defacto standard on UNIX) into
> UTF-16.

So use UTF-8 internally.  You can still iterate through strings
efficiently.  Random access would take a performance hit.  When that's
an issue, the programmer can choose to use a char array (char =
UCS-4).  The same generic functions could largely handle both types.
 
> That is already the case: The Pascal version is translated to Nimrod
> and than compiles itself. Bootstrapping works.

I meant why not get rid of the translation step and implement the
compiler in idiomatic Nimrod.


> Or - if you don't want the "openarray[T]" restriction:
> proc map[T, S, U](data: T, op: proc(x: U): S): seq[S] =
>   result = @[]
>   for d in items(data): result.add(op(d))

This is hard for me to comprehend but I mayb look at the docs to try to
figure it out.

> The plan is to use LLVM as a backend and perhaps
> http://tinystm.org/. Of course, this is only wishful thinking. ;-)

Oh cool, I didn't know about tinystm.  But, my question about
mutability is how you protect STM transactions when other threads can
have references into shared mutable structures and clobber the
referents.  GHC uses its type system to prevent that, but I don't see
how Nimrod can really do the same, especially without GHC's rich set
of immutable types including stuff like immutable maps.

Have you ever looked at Tim Sweeney's presentation "The Next
Mainstream Programming Language"?  It's at:

http://www.st.cs.uni-saarland.de/edu/seminare/2005/advanced-fp/docs/sweeny.pdf


From tjreedy at udel.edu  Mon May 11 20:04:37 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 11 May 2009 20:04:37 -0400
Subject: OOP & Abstract Classes
In-Reply-To: <bZ%Nl.55092$ew.38769@newsfe24.iad>
References: <SZWNl.16133$hX2.2435@newsfe19.iad>	<slrnh0grfa.8na.nick@irishsea.home.craig-wood.com>
	<bZ%Nl.55092$ew.38769@newsfe24.iad>
Message-ID: <guaeej$ort$1@ger.gmane.org>

Adam Gaskins wrote:
> Wow, thanks Nick! This is just what I was looking for!

I agree that Nick's semi-abstract class is what you need.
After doing some subclasses, you may discover that there is more common 
code that you can factor out and push to the base class.  You may also 
find it convenient to derive a mock subclass that returns simulated data 
so you can test user code initially without involving (or waiting on) 
real devices.



From rtomek at ceti.com.pl  Mon May 11 20:10:06 2009
From: rtomek at ceti.com.pl (Tomasz Rola)
Date: Tue, 12 May 2009 02:10:06 +0200
Subject: Nimrod programming language
In-Reply-To: <d201b2cb-4b13-4970-a44b-9be1b553e293@j12g2000vbl.googlegroups.com>
References: <159308160@web.de>
	<mailman.5390.1241977162.11746.python-list@python.org>
	<d201b2cb-4b13-4970-a44b-9be1b553e293@j12g2000vbl.googlegroups.com>
Message-ID: <Pine.LNX.4.64.0905120140001.2367@tau.ceti.pl>

On Mon, 11 May 2009, rumpf_a at web.de wrote:

> > One question I ask myself upon seeing a new language is if it is possible
> > to program amb (amb=ambiguous) operator in it. This page gives a very
> > nice, "code first" explanation of amb and how it is supposed to work:
> >
> > http://www.randomhacks.net/articles/2005/10/11/amb-operator
> >
> Hm. I am not sure either. To me, it looks like a constraint solver by
> using brute force.

Yes, kind of. From what I understand [1], it's goal is to simulate 
nondeterministic "get right answer in one try", only this "one try" 
requires browsing the solution space (because we have only "classic" 
hardware). It is easy to use amb in wrong way, but I can see some cases 
when I would like it.

[1] John McCarthy's paper still waits to be read by me, so... Ok, I have 
just had a look at it and it seems that Ruby implementation is a bit 
primitive compared to original concept. But still, this is what would be 
needed in most real life cases, I suppose.

I think ability to define amb would allow me to write more concise code. 
As far as I can tell, this kind of stuff plays more and more important 
role in my programing.

> It seems to require continuations. AFAIK
> continuations are extremely hard to implement efficiently, so probably
> it won't be done in Nimrod.

Pity, a little. But not really big problem for me. Nimrod may be 
interesting anyway, time will tell :-).

Regards,
Tomasz Rola

--
** A C programmer asked whether computer had Buddha's nature.      **
** As the answer, master did "rm -rif" on the programmer's home    **
** directory. And then the C programmer became enlightened...      **
**                                                                 **
** Tomasz Rola          mailto:tomasz_rola at bigfoot.com             **


From namekuseijin.nospam at gmail.com  Mon May 11 20:27:56 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Mon, 11 May 2009 21:27:56 -0300
Subject: how to consume .NET webservice
In-Reply-To: <76rnq5F1dp6gpU1@mid.uni-berlin.de>
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net>
	<76rnq5F1dp6gpU1@mid.uni-berlin.de>
Message-ID: <guaf4j$1fsn$1@adenine.netfront.net>

Diez B. Roggisch wrote:
> namekuseijin schrieb:
>> bav escreveu:
>>> question from a python newbie;
>>>
>>>   how can i consume in python language, a .NET web service, passing
>>>   a string array as parameter in some easy steps?
>>
>> Unless Microsoft extended the standard in any way, then it should be 
>> just as you consume any web service, I guess. ;)
> 
> Microsoft *created* the standard.. 

No:

http://en.wikipedia.org/wiki/Web_service

It's a W3C internet standard.  Microsoft is one of many software 
companies behind the Consortium.

Here's the relevant official standards:

http://www.w3.org/2002/ws/#documents


From davea at ieee.org  Mon May 11 20:30:37 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 11 May 2009 20:30:37 -0400
Subject: Complete frustration
In-Reply-To: <4A085B14.2060908@hughes.net>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
	<4A085B14.2060908@hughes.net>
Message-ID: <4A08C32D.3020904@ieee.org>



norseman wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">hellcats 
> wrote:
>> I have Python2.5 installed on Windows XP. Whenever I double click on a
>> something.pyw file, IDLE launches and opens something.pyw in the
>> editor. I would prefer to actually *RUN* the program, not edit it. If
>> I want to edit it then I'll choose the "Edit with IDLE" context menu.
>> So I then have to press F5 to get the program to execute. Now I have
>> my program's windows along with two IDLE windows cluttering my screen
>> and task bar. WHAT IS GOING ON? I've tried changing the file
>> association to python.exe, and that works, but just ONCE (even if I
>> choose "always use the slected program to launch this kind of file").
>> IDLE may be great and all, but I fricken' don't want to see it every
>> time I just want to run a python program!!!!!
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
>>
> ------------------------
> I agree completely.  Check the Python-List archives. Look for a file 
> that is dated July 8, 2008 (07/08/2008) that was sent by norseman.
>
> It works for me.
>
>
> Steve
>
> </div>
For a Unix person, you sure act like you know Windows.  But changing the 
PATH environment variable affects a command typed in the shell, but does 
not affect what happens when you either type the name of a python script 
directly, or when you double-click on such a file.  That's controlled by 
file associations.  (PATH isn't the answer in Unix either, most shells 
use the shebang at the beginning of the script.)

File associations can be controlled in a number of ways.  OPEN-WITH is 
one way.  REGEDIT is another.  In fact, any program can modify these 
settings, including your own scripts.  Something is changing things back 
on you.  But once you're having the problem of things reverting 
"automatically," a command line tool is sometimes the easiest.

Two built-in commands (they're inside the cmd.exe shell) can help.  
They're ASSOC and FTYPE

Since the extension you're bothered by is .pyw, try the following:

C:>  assoc .pyw
.pyw=Python.NoConFile

C:> ftype Python.NoConFile
Python.NoConFile="C:\ProgFiles\Python26\pythonw.exe" "%1" %*


Type them once and copy/paste results somewhere.

Then fix the problem, and look again.  Check that they work by 
double-clicking a xxx.pyw file in Explorer.

Now, run other things, especially IDLE, and recheck these two commands 
to see if something changed.  If it did, then blame whatever program you 
just ran.

My guess is that it changed when some Python installation was done.  And 
some programs have a habit of continually resetting their own 
associations.  Sometimes this is configurable, sometimes you just have 
to stop using the brain-dead program.

Notes:  your path is unlikely to be the same as mine, so replace the 
C:\ProgFiles...  string as appropriate to your preferred Python version 
location. Note you want Pythonw.exe, or you'll wind up with an extra 
shell window.   You can do the same thing for the .py extension, which 
should wind up running python.exe.  And you can make a simple two-line 
batch file to set these (assoc/ftype).  If you had several such batch 
files you could change the default python very easily.  Unlike 
environment variables, these associations are global, across all users, 
across all applications.  So changes made in one shell affect any other 
shells, as well as the Explorer windows.

Final note:  once you've got these right, you can run a script in the 
obvious way (like Unix).
    myprogram.py  parm1 parm2
will actually run    python.exe  myprogram.py  parm1 parm2

And if you add a .PY and .PYW to  PATHEXT environment variable, you can 
just run
    myprogram parm1 parm2
without any extension on the script name.   This should normally be done 
in the Control Panel->Environment vars  so it'll work in multiple DOS 
boxes, same as all environment variable changes.



From ldo at geek-central.gen.new_zealand  Mon May 11 20:37:20 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 12:37:20 +1200
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org>
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
Message-ID: <guagc0$2ji$2@lust.ihug.co.nz>

In message <57f4c81a-3537-49fa-a5f6-
a0cc0d43d599 at o14g2000vbo.googlegroups.com>, rumpf_a at web.de wrote:

> I am dissatisfied with Python's (or Java's) Unicode handling:
> 1) IO overhead to convert UTF-8 (defacto standard on UNIX) into
> UTF-16.

Are you sure they're using UTF-16? I would use UCS-2 or UCS-4.



From ldo at geek-central.gen.new_zealand  Mon May 11 20:44:57 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 12:44:57 +1200
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
References: <mailman.5282.1241783298.11746.python-list@python.org>
	<gu6i38$jhk$1@panix3.panix.com>
	<mailman.5375.1241962005.11746.python-list@python.org>
	<gu9fr2$je5$1@panix3.panix.com>
	<mailman.5.1242076536.8015.python-list@python.org>
Message-ID: <guagq9$361$1@lust.ihug.co.nz>

In message <mailman.5.1242076536.8015.python-list at python.org>, Geoff 
Gardiner wrote:

> @Lawrence D'Oliveiro:
> ...

I see that you published my unobfuscated e-mail address on USENET for all to 
see. I obfuscated it for a reason, to keep the spammers away. I'm assuming 
this was a momentary lapse of judgement, for which I expect an apology. 
Otherwise, it becomes grounds for an abuse complaint to your ISP.



From socyl at 987jk.com.invalid  Mon May 11 21:55:51 2009
From: socyl at 987jk.com.invalid (kj)
Date: Tue, 12 May 2009 01:55:51 +0000 (UTC)
Subject: OS X: How to play .wav file w/Python?
Message-ID: <guakv7$h81$1@reader1.panix.com>


Hi. I'm trying to learn how to play a .wav file in OS X with Python.
I tried the following, which ran without errors, but produced
nothing audible (even though the file bell.wav plays perfectly well
otherwise, e.g. view the Finder's Preview):

import pygame.mixer

pygame.mixer.init()
pygame.mixer.Sound("bell.wav").play
print "done"


What am I doing wrong?

TIA!

kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From pavlovevidence at gmail.com  Mon May 11 22:01:13 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 11 May 2009 19:01:13 -0700 (PDT)
Subject: creating classes with mix-ins
References: <d6409bb3-f2ed-4964-942a-b0698060a7f0@e24g2000vbe.googlegroups.com>
Message-ID: <fe808a4d-26e0-4003-be1a-2e768d7d81cc@r13g2000vbr.googlegroups.com>

On May 11, 11:16?am, samwyse <samw... at gmail.com> wrote:
> I'm writing a class that derives it's functionality from mix-ins.
> Here's the code:
>
> ? ? def boilerplate(what): ? # This used to be a decorator, but all of
> the
> ? ? ? ? ##what = f.__name__ ?# function bodies turned out to be
> 'pass'.
> ? ? ? ? 'Validate the user, then call the appropriate plug-in.'
> ? ? ? ? def template(self, which, username, password, *args):
> ? ? ? ? ? ? if not self.security.isAuthorised(username, password,
> which, what):
> ? ? ? ? ? ? ? ? raise Exception('Unauthorised access')
> ? ? ? ? ? ? return getattr(self.blog, what)(which, *args)
> ? ? ? ? template.__name__ = what
> ? ? ? ? template.__doc__ = getattr(self.blog, what).__doc__
> ? ? ? ? return template
>
> ? ? class MetaWeblog(object):
> ? ? ? ? def __init__(self,
> ? ? ? ? ? ? ? ? ? ? ?securityHandler=SimpleSecurityHandler,
> ? ? ? ? ? ? ? ? ? ? ?blogHandler=SimpleBlogHandler):
> ? ? ? ? ? ? self.security = securityHandler()
> ? ? ? ? ? ? self.blog = blogHandler()
> ? ? ? ? newPost = boilerplate('newPost')
> ? ? ? ? editPost = boilerplate('editPost')
> ? ? ? ? getPost = boilerplate('getPost')
> ? ? ? ? # etc, etc, etc
>
> I'd like to replace the method definitions with a loop:
> ? ? ? ? for what in attr_list:
> ? ? ? ? ? ? setattr(klass, what, boilerplate(what))
>
> That begs the question of where I define 'klass' and 'attr_list'.
> Should I use a class decorator, or a metaclass?

Here's the thing: unless you have advance knowledge of the methods
defined by self.blog, you can't get the attr_list at class definition
time, which means neither the metaclass nor the decorator would be a
good approach.  If that's the case, you should define newPost,
editPost, and whatever other methods of self.blog as ordinary
attributes of self, within the init function.  boilerplate would be
the same except you would pass self to it and allow template to use it
from its nested scope (it would no longer be an instance method since
it's an ordinary attribute).

If you do know what the methods of self.blog will be, then that's
where you get attr_list from.  So, for instance, if blogHandler always
returns an object of type Blog, then you could inspect Blog's type
dict to see what methods are defined in it; in fact you probably want
to check the whole MRO for Blog, like this (untested):

attr_list = []
for cls in Blog.__mro__:
    for value in cls.__dict__:
        if is_wrapped_method(value):
            attr_list.append(value)


A metaclass is probably overkill to assign the wrapped blog methods.
I probably wouldn't even bother with the decorator, and just write the
loop after the class definition.  Then you can use MetaBlog directly
for klass.

class MetaBlog(object):
    ...

for what in attr_list:
    setattr(MetaBlog, what, boilerplate(what))


If it were the kind of thing I found myself doing often I'd refactor
into a decorator.


Carl Banks


From debl2NoSpam at verizon.net  Mon May 11 22:22:56 2009
From: debl2NoSpam at verizon.net (David Lees)
Date: Tue, 12 May 2009 02:22:56 GMT
Subject: Unable to install Pywin32 for Python 2.6.2
Message-ID: <445Ol.724$5F2.395@nwrddc01.gnilink.net>

I have no problem installing Python 2.6.2 for windows under XP SP3 and 
IDLE and the command line versions work fine.  When I run the pywin32 
installer downloaded from sourceforge (pywin32-212.win32-py2.6.exe) I 
get the following error message:

Traceback (most recent call last):
   File "<string>", line 565, in <module>
   File "<string>", line 291, in install
ImportError: Module use of python25.dll conflicts with this version of 
Python.
*** run_installscript: internal error 0xFFFFFFFF ***

I have tried uninstalling Python 2.6 and reinstalling, but still get the 
same message.  I do have Python 2.5.4 and its associated Pywin32 on the 
same machine, but I have a laptop with pywin32 installed for both python 
2.5 and 2.6.

TIA

David Lees


From wuwei23 at gmail.com  Mon May 11 22:47:29 2009
From: wuwei23 at gmail.com (alex23)
Date: Mon, 11 May 2009 19:47:29 -0700 (PDT)
Subject: OS X: How to play .wav file w/Python?
References: <guakv7$h81$1@reader1.panix.com>
Message-ID: <eb1d688f-6de3-4388-9666-7c036d4d28c9@y34g2000prb.googlegroups.com>

On May 12, 11:55?am, kj <so... at 987jk.com.invalid> wrote:
> import pygame.mixer
>
> pygame.mixer.init()
> pygame.mixer.Sound("bell.wav").play
> print "done"
>
> What am I doing wrong?

Your first mistake is not pasting here the traceback you received.
That always makes it easier to assist with problems like this.

However, my guess is it's this line:

> pygame.mixer.Sound("bell.wav").play

'play' is a method, which means you need to call it. Try the following
instead:

> pygame.mixer.Sound("bell.wav").play()

And let us know how that goes :)


From aahz at pythoncraft.com  Mon May 11 22:50:08 2009
From: aahz at pythoncraft.com (Aahz)
Date: 11 May 2009 19:50:08 -0700
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
Message-ID: <guao50$1jv$1@panix3.panix.com>

In article <Xns9C08E179B66D8rtwfreenetREMOVEcouk at 216.196.109.145>,
Rob Williscroft  <rtw at freenet.co.uk> wrote:
>
>db.execute( '''
>    	update "sessions" set "uid" = ?
>    	where "uid" = ? 
>    	and exists(
>    	    	select * from "users" where "uid" = ?
>    	  )
>    ''',
>    (v['uid'],s.SID, v['uid']) 
>  )

This will be more efficient if you do "select uid from users".
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From jenn.duerr at gmail.com  Mon May 11 23:06:43 2009
From: jenn.duerr at gmail.com (noydb)
Date: Mon, 11 May 2009 20:06:43 -0700 (PDT)
Subject: putting date strings in order
Message-ID: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>

All,

How best to go about this?  >>

I have a list containing strings referring to months, like ["x_apr",
"x_jul", "x_jan", "x_aug", "x_may", etc] -- always using the 3-chars
for month.  The list will contain all 12 months, however the starting
month may not necessarily be jan.  I want to order the list
chronologically, but starting with the user-defined starting month.
So a list could be [x_aug, x_sep, .... x_jul].  The list might just
start off in any random order, but I need to ensure, in the end, that
the list is in chronological order and starting with the proper month
per user needs.

Anyone have any good ideas?  I was curious to see what people came up
with.


From wuwei23 at gmail.com  Mon May 11 23:13:02 2009
From: wuwei23 at gmail.com (alex23)
Date: Mon, 11 May 2009 20:13:02 -0700 (PDT)
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
	<74c79941-af9b-4b43-b02b-8316b108f08d@l28g2000vba.googlegroups.com>
Message-ID: <83d2209a-8540-4cbb-8766-64d86b350314@c18g2000prh.googlegroups.com>

On May 12, 1:22?am, Mike Driscoll <kyoso... at gmail.com> wrote:
> I've never used (or heard of) the Abstract type...and the guy who
> wrote the FAQ was being a jerk. It looks like he was just throwing in
> an undefined variable name just to make his Python program break while
> taking a pot shot at people who use that sort of thing. Whatever.

The IAQ's entry on Abstract classes predates the introduction of
Abstract Base Classes to Python 2.6/3.0. Rather than being a "jerk",
the example shows how to produce similar behaviour without code AS
WELL as demonstrating a more extended approach. (You're not breaking
your program if the behaviour is intentional...)

> Hopefully someone who has used Abstract classes will jump in here and
> give you more information about whether or not they matter in Python.

Abstract classes are one mechanism for defining interfaces, but as
we've covered it's not the only approach that can be taken. I've
always been happy defining abstract methods using 'raise
NotImplementedError', but clearly the ABC approach is perceived as
having value otherwise it would never have been introduced into
2.6/3.0.


From yahoo at al-got-rhythm.net  Mon May 11 23:15:50 2009
From: yahoo at al-got-rhythm.net (Alan Brogan)
Date: Tue, 12 May 2009 04:15:50 +0100
Subject: Can I get a value's name
In-Reply-To: <4A08785A.6070906@seehart.com>
References: <gu9jqb+q7rk@eGroups.com> <4A08785A.6070906@seehart.com>
Message-ID: <12a6d6600905112015u174d4c4fg703913e4b1d220fd@mail.gmail.com>

Thank you Ken for your help answer

On Mon, May 11, 2009 at 8:11 PM, Ken Seehart <ken at seehart.com> wrote:
> jalanb3 wrote:
>>
<snip>
>> def replace_line(pattern,replacement):
>> ? ?values = '\n' in pattern and [ pattern ] or []
>> ? ?values += '\n' in replacement and [ replacement ] or []
>>
>> Can I later get the name "pattern" via values[0]?
>>
<snip>

> ?A value generally does not contain the
> "pattern" or any kind of name information (although class, method, and
> function instances contain some symbolic information in them).
>
That's why I took the question seriously at all:
     It was an entirely different project - pulling info out of
tracebacks into logs.
    And I can get names from a reference for classes, modules, ...
        Why not variables ?

> Study the concept of 'references' and all of this will become more clear.

I shall dive into that koan :-)

> The only way to do something like what you want would be to search globals()
> or locals() for the value (depending on the context), but that would be an
> extremely ugly hack.
Agreed

> Chances are that if you want to do this, you need to
> rethink the problem instead.
>
That does seem reasonable, but before I started writing Python it
would never occurred to me to add some attributes on to an object
whose definition I've never seen. So - unlikely, but I wouldn't rule
it out.

<snip>

> Note that a value can have several different names (and unnamed references)
> pointing at it,

Ah - there's  the rub !

All it takes (from my earlier example) is
    fred = pattern
    values += [ fred ]

Now which is "the real name" of values[0]?
In my example I would have wanted "pattern", and now whatever ugly
hack we used to get at "the name" is turning into an complex module.

> so the above code is not very general, but it may illustrate
> some interesting points.

Thanks - it does indeed.

> My guess is that your entire approach may need rethinking. ?What is the
> ultimate objective of your project?

Find out what some other Pythonista have thought about this problem

OTOH: the actual objective was to remove the redundancy of using the
string "pattern" when I already have a perfectly good eponymous
variable.  On balance I think allowing a little bit of redundancy is
prudent in this case :-)


From Gforrest.yang at gmail.com  Mon May 11 23:28:13 2009
From: Gforrest.yang at gmail.com (forrest yang)
Date: Mon, 11 May 2009 20:28:13 -0700 (PDT)
Subject: dict would be very slow for big data
Message-ID: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>

hi
i am trying to insert a lot of data into a dict, which may be
10,000,000 level.
after inserting 100000 unit, the insert rate become very slow, 50,000/
s, and the entire time used for this task would be very long,also.
would anyone know some solution for this case?

thanks


From http  Mon May 11 23:30:17 2009
From: http (Paul Rubin)
Date: 11 May 2009 20:30:17 -0700
Subject: putting date strings in order
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>
Message-ID: <7x8wl3c81i.fsf@ruckus.brouhaha.com>

noydb <jenn.duerr at gmail.com> writes:
> Anyone have any good ideas?  I was curious to see what people came up
> with.

Is this a homework assignment?  Some hints:

1) figure out how to compare two month names for chronological order,
   leaving out the issue of the starting month not being january.
2) figure out how to adjust for the starting month.  The exact
   semantics of the "%" operator might help do this concisely.


From kai.diefenbach at googlemail.com  Mon May 11 23:35:04 2009
From: kai.diefenbach at googlemail.com (Kai Diefenbach)
Date: Mon, 11 May 2009 20:35:04 -0700 (PDT)
Subject: ANN: Demo online shop for LFS
Message-ID: <9f40e0d7-d1f2-474b-89b5-7ec8dd14b78d@z5g2000vba.googlegroups.com>

Hi,

I'm pleased to announce that there is new demo shop for LFS:
http://demo.getlfs.com

LFS is an online shop based on Django and distributed  under the BSD-
License

For more information please visit http://www.getlfs.com, subscribe to
our feed http://www.getlfs.com/feeds/news or follow us on Twitter
http://twitter.com/lfsproject.

Thanks
K?i


From showell30 at yahoo.com  Tue May 12 00:07:44 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 11 May 2009 21:07:44 -0700 (PDT)
Subject: dict would be very slow for big data
References: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>
Message-ID: <7d5e78ae-2ef8-4260-b389-4660d6aff139@t10g2000vbg.googlegroups.com>

On May 11, 8:28?pm, forrest yang <Gforrest.y... at gmail.com> wrote:
> hi
> i am trying to insert a lot of data into a dict, which may be
> 10,000,000 level.
> after inserting 100000 unit, the insert rate become very slow, 50,000/
> s, and the entire time used for this task would be very long,also.
> would anyone know some solution for this case?
>

Are you running out of memory?  What are your keys?  Are you able to
gather any more specific data about the slowdown--do all operations
slow down equally or are there spurts of slowness?



From gagsl-py2 at yahoo.com.ar  Tue May 12 00:14:43 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 12 May 2009 01:14:43 -0300
Subject: web access through vpn client
References: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
	<7a9c25c20905011741m6b5d4360yf32acdf99238a685@mail.gmail.com>
Message-ID: <op.utst2t13x6zn5v@lepton.softlabbsas.com.ar>

En Fri, 01 May 2009 21:41:03 -0300, Stephen Hansen <apt.shansen at gmail.com>  
escribi?:

>> urllib2 and BeautifulSoup work pretty well to do what I want, and the
>> first little routine actually gets the data from the web page...
>> except if my VPN client is turned on.
>
> Usually when something like that happens with a VPN its because the VPN  
> has been configured to do so. Its the default usually and is a security
> precaution.  The exact wording of the option varies from VPN client to  
> VPN client; and its usually hidden deep in 'advanced'. E.g., on the mac 
> its "Send all traffic over VPN connection", on Windows I /believe/ its  
> something like "Set as default gateway" but its been awhile since I had 
> to tweak my windows install. No idea what it looks like on the Cisco 
> client.

Reading c.l.p. helps even for non-Python questions! A friend of mine had a  
problem with a VPN, I vaguely remembered this post and looked for it, and  
in a few minutes we fixed the problem. Thanks!

-- 
Gabriel Genellina



From david.lyon at preisshare.net  Tue May 12 00:16:58 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 12 May 2009 00:16:58 -0400
Subject: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <445Ol.724$5F2.395@nwrddc01.gnilink.net>
References: <445Ol.724$5F2.395@nwrddc01.gnilink.net>
Message-ID: <7dc7b3785ee4e6817b7b1b1946e1e41c@preisshare.net>


Hi,

hmmm... that's annoying..

Whilst I don't have an exact answer I have a few hunches...

Perphaps what has happened is that the windows installer between
the versions of pywin32 has installed newer versions of the same
dlls over the top of older ones.

Or, possibly, the installer hasn't wanted to replace older dll's 
because they already exist on the system.

This would result in a mismatch.

You may be lucky and find an install log. This might tell you which
files were actually installed. And you could play around with
moving them around.

Good luck with your night vision task....

David


On Tue, 12 May 2009 02:22:56 GMT, David Lees <debl2NoSpam at verizon.net>
wrote:
> I have no problem installing Python 2.6.2 for windows under XP SP3 and 
> IDLE and the command line versions work fine.  When I run the pywin32 
> installer downloaded from sourceforge (pywin32-212.win32-py2.6.exe) I 
> get the following error message:
> 
> Traceback (most recent call last):
>    File "<string>", line 565, in <module>
>    File "<string>", line 291, in install
> ImportError: Module use of python25.dll conflicts with this version of 
> Python.
> *** run_installscript: internal error 0xFFFFFFFF ***
> 
> I have tried uninstalling Python 2.6 and reinstalling, but still get the 
> same message.  I do have Python 2.5.4 and its associated Pywin32 on the 
> same machine, but I have a laptop with pywin32 installed for both python 
> 2.5 and 2.6.
> 
> TIA
> 
> David Lees


From david.lyon at preisshare.net  Tue May 12 00:18:28 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 12 May 2009 00:18:28 -0400
Subject: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <445Ol.724$5F2.395@nwrddc01.gnilink.net>
References: <445Ol.724$5F2.395@nwrddc01.gnilink.net>
Message-ID: <974a7ad00eec34e80f30a544643cc5d9@preisshare.net>

On Tue, 12 May 2009 02:22:56 GMT, David Lees <debl2NoSpam at verizon.net>
wrote:
> I have no problem installing Python 2.6.2 for windows under XP SP3 and 
> IDLE and the command line versions work fine.  When I run the pywin32 
> installer downloaded from sourceforge (pywin32-212.win32-py2.6.exe) I 
> get the following error message:
> 
> Traceback (most recent call last):
>    File "<string>", line 565, in <module>
>    File "<string>", line 291, in install
> ImportError: Module use of python25.dll conflicts with this version of 
> Python.
> *** run_installscript: internal error 0xFFFFFFFF ***
> 
> I have tried uninstalling Python 2.6 and reinstalling, but still get the 
> same message.  I do have Python 2.5.4 and its associated Pywin32 on the 
> same machine, but I have a laptop with pywin32 installed for both python 
> 2.5 and 2.6.
> 
> TIA
> 
> David Lees


From showell30 at yahoo.com  Tue May 12 00:49:51 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 11 May 2009 21:49:51 -0700 (PDT)
Subject: piping input to an external script
References: <gu9pbe$csc$1@foggy.unx.sas.com>
Message-ID: <73b5bc5d-df66-465c-819d-aa8758afe110@z7g2000vbh.googlegroups.com>

On May 11, 11:04?am, "Tim Arnold" <tim.arn... at sas.com> wrote:
> Hi, I have some html files that I want to validate by using an external
> script 'validate'. The html files need a doctype header attached before
> validation. The files are in utf8 encoding. My code:
> ---------------
> import os,sys
> import codecs,subprocess
> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
>
> filename ?= 'mytest.html'
> fd = codecs.open(filename,'rb',encoding='utf8')
> s = HEADER + fd.read()
> fd.close()
>
> p = subprocess.Popen(['validate'],
> ? ? ? ? ? ? ? ? ? ? stdin=subprocess.PIPE,
> ? ? ? ? ? ? ? ? ? ? stdout=subprocess.PIPE,
> ? ? ? ? ? ? ? ? ? ? stderr=subprocess.STDOUT)
> validate = p.communicate(unicode(s,encoding='utf8'))
> print validate
> ---------------
>
> I get lots of lines like this:
> Error at line 1, character 66:\tillegal character number 0
> etc etc.
>
> But I can give the command in a terminal 'cat mytest.html | validate' and
> get reasonable output. My subprocess code must be wrong, but I could use
> some help to see what the problem is.
>

Newline missing after the header is my guess.


From kay at fiber-space.de  Tue May 12 00:54:33 2009
From: kay at fiber-space.de (kay at fiber-space.de)
Date: Mon, 11 May 2009 21:54:33 -0700 (PDT)
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.5390.1241977162.11746.python-list@python.org> 
	<d201b2cb-4b13-4970-a44b-9be1b553e293@j12g2000vbl.googlegroups.com> 
	<Pine.LNX.4.64.0905120140001.2367@tau.ceti.pl>
Message-ID: <f8dfc0a0-8f8e-4f54-ab45-2ae4e5e60bfe@t11g2000vbc.googlegroups.com>

On 12 Mai, 02:10, Tomasz Rola <rto... at ceti.com.pl> wrote:
> On Mon, 11 May 2009, rump... at web.de wrote:
> > > One question I ask myself upon seeing a new language is if it is possible
> > > to program amb (amb=ambiguous) operator in it. This page gives a very
> > > nice, "code first" explanation of amb and how it is supposed to work:
>
> > >http://www.randomhacks.net/articles/2005/10/11/amb-operator
>
> > Hm. I am not sure either. To me, it looks like a constraint solver by
> > using brute force.
>
> Yes, kind of. From what I understand [1], it's goal is to simulate
> nondeterministic "get right answer in one try", only this "one try"
> requires browsing the solution space (because we have only "classic"
> hardware). It is easy to use amb in wrong way, but I can see some cases
> when I would like it.

In Python you can use a generator expression. Dan Piponis example can
be stated as

g = ((i,j) for i in range(2,100) for j in range(2,i) if i*j == 481)

which doesn't require any call/cc hacks but is a deterministic "get
right in one try". Once Nimrod has coroutines it's just a matter of
sugaring them into comprehensions.

>
> [1] John McCarthy's paper still waits to be read by me, so... Ok, I have
> just had a look at it and it seems that Ruby implementation is a bit
> primitive compared to original concept. But still, this is what would be
> needed in most real life cases, I suppose.
>
> I think ability to define amb would allow me to write more concise code.
> As far as I can tell, this kind of stuff plays more and more important
> role in my programing.
>
> > It seems to require continuations. AFAIK
> > continuations are extremely hard to implement efficiently, so probably
> > it won't be done in Nimrod.
>
> Pity, a little. But not really big problem for me. Nimrod may be
> interesting anyway, time will tell :-).
>
> Regards,
> Tomasz Rola
>
> --
> ** A C programmer asked whether computer had Buddha's nature.      **
> ** As the answer, master did "rm -rif" on the programmer's home    **
> ** directory. And then the C programmer became enlightened...      **
> **                                                                 **
> ** Tomasz Rola          mailto:tomasz_r... at bigfoot.com             **



From david.lyon at preisshare.net  Tue May 12 01:13:25 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 12 May 2009 01:13:25 -0400
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
Message-ID: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>

Hi,

hmmm... that's annoying..

Whilst I don't have an exact answer I have a few hunches...

Perphaps what has happened is that the windows installer between
the versions of pywin32 has installed newer versions of the same
dlls over the top of older ones.

Or, possibly, the installer hasn't wanted to replace older dll's 
because they already exist on the system.

This would result in a mismatch.

You may be lucky and find an install log. This might tell you which
files were actually installed. And you could play around with
moving them around.

Good luck with your night vision task....

David


On Tue, 12 May 2009 02:22:56 GMT, David Lees <debl2NoSpam at verizon.net>
wrote:
> I have no problem installing Python 2.6.2 for windows under XP SP3 and 
> IDLE and the command line versions work fine.  When I run the pywin32 
> installer downloaded from sourceforge (pywin32-212.win32-py2.6.exe) I 
> get the following error message:
> 
> Traceback (most recent call last):
>    File "<string>", line 565, in <module>
>    File "<string>", line 291, in install
> ImportError: Module use of python25.dll conflicts with this version of 
> Python.
> *** run_installscript: internal error 0xFFFFFFFF ***
> 
> I have tried uninstalling Python 2.6 and reinstalling, but still get the 
> same message.  I do have Python 2.5.4 and its associated Pywin32 on the 
> same machine, but I have a laptop with pywin32 installed for both python 
> 2.5 and 2.6.
> 
> TIA
> 
> David Lees


From norseman at hughes.net  Tue May 12 01:16:48 2009
From: norseman at hughes.net (norseman)
Date: Mon, 11 May 2009 22:16:48 -0700
Subject: piping input to an external script
In-Reply-To: <gu9pbe$csc$1@foggy.unx.sas.com>
References: <gu9pbe$csc$1@foggy.unx.sas.com>
Message-ID: <4A090640.8000303@hughes.net>

Tim Arnold wrote:
> Hi, I have some html files that I want to validate by using an external 
> script 'validate'. The html files need a doctype header attached before 
> validation. The files are in utf8 encoding. My code:
> ---------------
> import os,sys
> import codecs,subprocess
> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
> 
> filename  = 'mytest.html'
> fd = codecs.open(filename,'rb',encoding='utf8')
> s = HEADER + fd.read()
> fd.close()
> 
> p = subprocess.Popen(['validate'],
>                     stdin=subprocess.PIPE,
>                     stdout=subprocess.PIPE,
>                     stderr=subprocess.STDOUT)
> validate = p.communicate(unicode(s,encoding='utf8'))
> print validate
> ---------------
> 
> I get lots of lines like this:
> Error at line 1, character 66:\tillegal character number 0
> etc etc.
> 
> But I can give the command in a terminal 'cat mytest.html | validate' and 
> get reasonable output. My subprocess code must be wrong, but I could use 
> some help to see what the problem is.
> 
> python2.5.1, freebsd6
> thanks,
> --Tim
> 
> 
============================
If you search through the recent Python-List for UTF-8 things you might 
get the same understanding I have come to.

the problem is the use of python's 'print' subcommand or what ever it 
is. It 'cooks' things and someone decided that it would only handle 1/2 
of a byte (in the x'00 to x'7f' range) and ignore or send error messages 
against anything else. I guess the person doing the deciding read the 
part that says ASCII printables are in the 7 bit range and chose to 
ignore the part about the rest of the byte being undefined. That is 
undefined, not disallowed.  Means the high bit half can be used as 
wanted since it isn't already taken. Nor did whoever it was take a look 
around the computer world and realize the conflict that was going to be 
generated by using only 1/2 of a byte in a 1byte+ world.

If you can modify your code to use read and write you can bypass print 
and be OK.  Or just have python do the 'cat mytest.html | validate' for 
you. (Apply a var for html and let python accomplish the the equivalent 
of Unix's:
    for f in *.html; do cat $f | validate; done
                         or
     for f in *.html; do validate $f; done  #file name available this way

If you still have problems, take a look at os.POPEN2 (and its popen3)
Also take look at os.spawn.. et al

HTH

Steve


From showell30 at yahoo.com  Tue May 12 01:50:02 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 11 May 2009 22:50:02 -0700 (PDT)
Subject: piping input to an external script
References: <gu9pbe$csc$1@foggy.unx.sas.com>
	<mailman.21.1242105403.8015.python-list@python.org>
Message-ID: <81e57098-b61e-4e8b-826c-833518c8115e@r3g2000vbp.googlegroups.com>

On May 11, 10:16?pm, norseman <norse... at hughes.net> wrote:
> Tim Arnold wrote:
> > Hi, I have some html files that I want to validate by using an external
> > script 'validate'. The html files need a doctype header attached before
> > validation. The files are in utf8 encoding. My code:
> > ---------------
> > import os,sys
> > import codecs,subprocess
> > HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
>
> > filename ?= 'mytest.html'
> > fd = codecs.open(filename,'rb',encoding='utf8')
> > s = HEADER + fd.read()
> > fd.close()
>
> > p = subprocess.Popen(['validate'],
> > ? ? ? ? ? ? ? ? ? ? stdin=subprocess.PIPE,
> > ? ? ? ? ? ? ? ? ? ? stdout=subprocess.PIPE,
> > ? ? ? ? ? ? ? ? ? ? stderr=subprocess.STDOUT)
> > validate = p.communicate(unicode(s,encoding='utf8'))
> > print validate
> > ---------------
>
> > I get lots of lines like this:
> > Error at line 1, character 66:\tillegal character number 0
> > etc etc.
>
> > But I can give the command in a terminal 'cat mytest.html | validate' and
> > get reasonable output. My subprocess code must be wrong, but I could use
> > some help to see what the problem is.
>
> > python2.5.1, freebsd6
> > thanks,
> > --Tim
>
> ============================
> If you search through the recent Python-List for UTF-8 things you might
> get the same understanding I have come to.
>
> the problem is the use of python's 'print' subcommand or what ever it
> is. It 'cooks' things and someone decided that it would only handle 1/2
> of a byte (in the x'00 to x'7f' range) and ignore or send error messages
> against anything else. I guess the person doing the deciding read the
> part that says ASCII printables are in the 7 bit range and chose to
> ignore the part about the rest of the byte being undefined. That is
> undefined, not disallowed. ?Means the high bit half can be used as
> wanted since it isn't already taken. Nor did whoever it was take a look
> around the computer world and realize the conflict that was going to be
> generated by using only 1/2 of a byte in a 1byte+ world.
>
> If you can modify your code to use read and write you can bypass print
> and be OK. ?Or just have python do the 'cat mytest.html | validate' for
> you. (Apply a var for html and let python accomplish the the equivalent
> of Unix's:
> ? ? for f in *.html; do cat $f | validate; done
> ? ? ? ? ? ? ? ? ? ? ? ? ?or
> ? ? ?for f in *.html; do validate $f; done ?#file name available this way
>
> If you still have problems, take a look at os.POPEN2 (and its popen3)
> Also take look at os.spawn.. et al
>

Wow.  Unicode and subprocessing and printing can have dark corners,
but common sense does apply in MOST situations.

If you send the header, add the newline.

But you do not need the header if you can cat the input file sans
header and get sensible input.

Finally, if you are concerned about adding the header, then it belongs
in the original input file; otherwise, you are creating a false
positive.


From skippy.hammond at gmail.com  Tue May 12 02:00:34 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Tue, 12 May 2009 16:00:34 +1000
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>
Message-ID: <4A091082.8090004@gmail.com>

Probably some import statement is finding a .pyd module built against 
Python 2.5 instead of Python 2.6; it might be that PYTHONPATH points 
somewhere wrong, or the registry for Python 2.6 is setup wrong, or 
something else entirely...

Cheers,

Mark

On 12/05/2009 3:13 PM, David Lyon wrote:
> Hi,
>
> hmmm... that's annoying..
>
> Whilst I don't have an exact answer I have a few hunches...
>
> Perphaps what has happened is that the windows installer between
> the versions of pywin32 has installed newer versions of the same
> dlls over the top of older ones.
>
> Or, possibly, the installer hasn't wanted to replace older dll's
> because they already exist on the system.
>
> This would result in a mismatch.
>
> You may be lucky and find an install log. This might tell you which
> files were actually installed. And you could play around with
> moving them around.
>
> Good luck with your night vision task....
>
> David
>
>
> On Tue, 12 May 2009 02:22:56 GMT, David Lees<debl2NoSpam at verizon.net>
> wrote:
>> I have no problem installing Python 2.6.2 for windows under XP SP3 and
>> IDLE and the command line versions work fine.  When I run the pywin32
>> installer downloaded from sourceforge (pywin32-212.win32-py2.6.exe) I
>> get the following error message:
>>
>> Traceback (most recent call last):
>>     File "<string>", line 565, in<module>
>>     File "<string>", line 291, in install
>> ImportError: Module use of python25.dll conflicts with this version of
>> Python.
>> *** run_installscript: internal error 0xFFFFFFFF ***
>>
>> I have tried uninstalling Python 2.6 and reinstalling, but still get the
>> same message.  I do have Python 2.5.4 and its associated Pywin32 on the
>> same machine, but I have a laptop with pywin32 installed for both python
>> 2.5 and 2.6.
>>
>> TIA
>>
>> David Lees



From norseman at hughes.net  Tue May 12 02:31:45 2009
From: norseman at hughes.net (norseman)
Date: Mon, 11 May 2009 23:31:45 -0700
Subject: piping input to an external script
In-Reply-To: <81e57098-b61e-4e8b-826c-833518c8115e@r3g2000vbp.googlegroups.com>
References: <gu9pbe$csc$1@foggy.unx.sas.com>	<mailman.21.1242105403.8015.python-list@python.org>
	<81e57098-b61e-4e8b-826c-833518c8115e@r3g2000vbp.googlegroups.com>
Message-ID: <4A0917D1.7020903@hughes.net>

Steve Howell wrote:
> On May 11, 10:16 pm, norseman <norse... at hughes.net> wrote:
>> Tim Arnold wrote:
>>> Hi, I have some html files that I want to validate by using an external
>>> script 'validate'. The html files need a doctype header attached before
>>> validation. The files are in utf8 encoding. My code:
>>> ---------------
>>> import os,sys
>>> import codecs,subprocess
>>> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
>>> filename  = 'mytest.html'
>>> fd = codecs.open(filename,'rb',encoding='utf8')
>>> s = HEADER + fd.read()
>>> fd.close()
>>> p = subprocess.Popen(['validate'],
>>>                     stdin=subprocess.PIPE,
>>>                     stdout=subprocess.PIPE,
>>>                     stderr=subprocess.STDOUT)
>>> validate = p.communicate(unicode(s,encoding='utf8'))
>>> print validate
>>> ---------------
>>> I get lots of lines like this:
>>> Error at line 1, character 66:\tillegal character number 0
>>> etc etc.
>>> But I can give the command in a terminal 'cat mytest.html | validate' and
>>> get reasonable output. My subprocess code must be wrong, but I could use
>>> some help to see what the problem is.
>>> python2.5.1, freebsd6
>>> thanks,
>>> --Tim
>> ============================
>> If you search through the recent Python-List for UTF-8 things you might
>> get the same understanding I have come to.
>>
>> the problem is the use of python's 'print' subcommand or what ever it
>> is. It 'cooks' things and someone decided that it would only handle 1/2
>> of a byte (in the x'00 to x'7f' range) and ignore or send error messages
>> against anything else. I guess the person doing the deciding read the
>> part that says ASCII printables are in the 7 bit range and chose to
>> ignore the part about the rest of the byte being undefined. That is
>> undefined, not disallowed.  Means the high bit half can be used as
>> wanted since it isn't already taken. Nor did whoever it was take a look
>> around the computer world and realize the conflict that was going to be
>> generated by using only 1/2 of a byte in a 1byte+ world.
>>
>> If you can modify your code to use read and write you can bypass print
>> and be OK.  Or just have python do the 'cat mytest.html | validate' for
>> you. (Apply a var for html and let python accomplish the the equivalent
>> of Unix's:
>>     for f in *.html; do cat $f | validate; done
>>                          or
>>      for f in *.html; do validate $f; done  #file name available this way
>>
>> If you still have problems, take a look at os.POPEN2 (and its popen3)
>> Also take look at os.spawn.. et al
>>
> 
> Wow.  Unicode and subprocessing and printing can have dark corners,
> but common sense does apply in MOST situations.
> 
> If you send the header, add the newline.
> 
> But you do not need the header if you can cat the input file sans
> header and get sensible input.
> 

Yep!  The problem is with 'print'

> Finally, if you are concerned about adding the header, then it belongs
> in the original input file; otherwise, you are creating a false
> positive.


Steve


From ggardiner at iee.org  Tue May 12 02:36:57 2009
From: ggardiner at iee.org (Geoff Gardiner)
Date: Tue, 12 May 2009 07:36:57 +0100
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
In-Reply-To: <guagq9$361$1@lust.ihug.co.nz>
References: <mailman.5282.1241783298.11746.python-list@python.org>	<gu6i38$jhk$1@panix3.panix.com>	<mailman.5375.1241962005.11746.python-list@python.org>	<gu9fr2$je5$1@panix3.panix.com>	<mailman.5.1242076536.8015.python-list@python.org>
	<guagq9$361$1@lust.ihug.co.nz>
Message-ID: <4A091909.4070108@iee.org>

Lawrence D'Oliveiro wrote:
> .. I expect an apology. 
> Otherwise, it becomes grounds for an abuse complaint to your ISP.
>   
Yes, I do apologize profusely and publicly, and would have done so
regardless of threat.

I had trouble with posts making it through to the list and so was also
posting in parallel to the original posters. In doing so, your address
initially bounced the message - so I changed it unthinkingly in a to: line.

I did not realize until this morning that they made it through
python-list unchanged, as they obviously do.

All the best,
Geoff




From ralf321 at gmx.de  Tue May 12 02:48:49 2009
From: ralf321 at gmx.de (ralf321 at gmx.de)
Date: Mon, 11 May 2009 23:48:49 -0700 (PDT)
Subject: install pyPgSQL on Windows for python 2.5
References: <4e9538ae-15b3-4214-b3d7-ebf948bf2f17@r33g2000yqn.googlegroups.com>
	<72se78Frtj4nU1@mid.individual.net>
	<fc2d1dbe-c1f2-4d41-8984-e5979cd8b6b6@v15g2000yqn.googlegroups.com>
Message-ID: <912b822c-e6ac-4e2f-bddf-8c422c7e8bab@r34g2000vbi.googlegroups.com>

On 24 Mrz., 18:25, someon <petshm... at googlemail.com> wrote:
> On Mar 24, 4:57?pm, Dietmar Schwertberger <n... at schwertberger.de>
> wrote:
>
> > someone wrote:
> > > Hi,
>
> > > does anyone know how to install pyPgSQL on Windows? There is no
> > > package for Python 2.5 on Homepage:
> > > I've installed newest Visual C++ Studio 2008 from Microsoft, but still
> > > no luck
>
> > Hello Pet,
>
> > you need Visual Studio 2003 to compile extensions for Python 2.5
> > If you want, I can send you a binary.
>
> O, thank you very much!
> Where should I put hole thing?
>
> > Regards,
>
> > Dietmar
>
>

Hello,
i need the binary files too.
can you send me or upload anywhere?
thanks.

regards
Ralf


From showell30 at yahoo.com  Tue May 12 02:50:23 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 11 May 2009 23:50:23 -0700 (PDT)
Subject: piping input to an external script
References: <gu9pbe$csc$1@foggy.unx.sas.com>
	<mailman.21.1242105403.8015.python-list@python.org> 
	<81e57098-b61e-4e8b-826c-833518c8115e@r3g2000vbp.googlegroups.com> 
	<mailman.23.1242109891.8015.python-list@python.org>
Message-ID: <e301dce1-fe8c-4089-aa51-97a3ded310a7@n4g2000vba.googlegroups.com>

On May 11, 11:31?pm, norseman <norse... at hughes.net> wrote:
> Steve Howell wrote:
> > On May 11, 10:16 pm, norseman <norse... at hughes.net> wrote:
> >> Tim Arnold wrote:
> >>> Hi, I have some html files that I want to validate by using an external
> >>> script 'validate'. The html files need a doctype header attached before
> >>> validation. The files are in utf8 encoding. My code:
> >>> ---------------
> >>> import os,sys
> >>> import codecs,subprocess
> >>> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
> >>> filename ?= 'mytest.html'
> >>> fd = codecs.open(filename,'rb',encoding='utf8')
> >>> s = HEADER + fd.read()
> >>> fd.close()
> >>> p = subprocess.Popen(['validate'],
> >>> ? ? ? ? ? ? ? ? ? ? stdin=subprocess.PIPE,
> >>> ? ? ? ? ? ? ? ? ? ? stdout=subprocess.PIPE,
> >>> ? ? ? ? ? ? ? ? ? ? stderr=subprocess.STDOUT)
> >>> validate = p.communicate(unicode(s,encoding='utf8'))
> >>> print validate
> >>> ---------------
> >>> I get lots of lines like this:
> >>> Error at line 1, character 66:\tillegal character number 0
> >>> etc etc.
> >>> But I can give the command in a terminal 'cat mytest.html | validate' and
> >>> get reasonable output. My subprocess code must be wrong, but I could use
> >>> some help to see what the problem is.
> >>> python2.5.1, freebsd6
> >>> thanks,
> >>> --Tim
> >> ============================
> >> If you search through the recent Python-List for UTF-8 things you might
> >> get the same understanding I have come to.
>
> >> the problem is the use of python's 'print' subcommand or what ever it
> >> is. It 'cooks' things and someone decided that it would only handle 1/2
> >> of a byte (in the x'00 to x'7f' range) and ignore or send error messages
> >> against anything else. I guess the person doing the deciding read the
> >> part that says ASCII printables are in the 7 bit range and chose to
> >> ignore the part about the rest of the byte being undefined. That is
> >> undefined, not disallowed. ?Means the high bit half can be used as
> >> wanted since it isn't already taken. Nor did whoever it was take a look
> >> around the computer world and realize the conflict that was going to be
> >> generated by using only 1/2 of a byte in a 1byte+ world.
>
> >> If you can modify your code to use read and write you can bypass print
> >> and be OK. ?Or just have python do the 'cat mytest.html | validate' for
> >> you. (Apply a var for html and let python accomplish the the equivalent
> >> of Unix's:
> >> ? ? for f in *.html; do cat $f | validate; done
> >> ? ? ? ? ? ? ? ? ? ? ? ? ?or
> >> ? ? ?for f in *.html; do validate $f; done ?#file name available this way
>
> >> If you still have problems, take a look at os.POPEN2 (and its popen3)
> >> Also take look at os.spawn.. et al
>
> > Wow. ?Unicode and subprocessing and printing can have dark corners,
> > but common sense does apply in MOST situations.
>
> > If you send the header, add the newline.
>
> > But you do not need the header if you can cat the input file sans
> > header and get sensible input.
>
> Yep! ?The problem is with 'print'
>

Huh?  Print is printing exactly what you expect it to print.



From mikael at isy.liu.se  Tue May 12 02:54:22 2009
From: mikael at isy.liu.se (Mikael Olofsson)
Date: Tue, 12 May 2009 08:54:22 +0200
Subject: Decorating methods - where do my arguments go?
In-Reply-To: <gu9jo6$9bk$01$1@news.t-online.com>
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
	<gu8u7s$l1$1@news.lysator.liu.se>
	<Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>
	<gu954t$29r$1@news.lysator.liu.se>
	<gu9jo6$9bk$01$1@news.t-online.com>
Message-ID: <guapa7$eri$1@news.lysator.liu.se>

Peter Otten wrote:
> I usually use decorator functions, but I think the following should work, 
> too:
> 
> class deco(object):
>     def __init__(self, func):
>         self._func = func
>     def __call__(self, *args):
>         print "Decorator:", args
>         self._func(*args)
>     def __get__(self, *args):
>         return deco(self._func.__get__(*args))

This looks like a winner to me. It is elegant, works for functions as 
well as for methods, and does not mess with the internals of the 
decorator which avoids the problems that Duncan pointed out.

Thanks Peter, and thanks everyone else that chimed in and contributed.

/MiO


From rtw at freenet.co.uk  Tue May 12 02:56:50 2009
From: rtw at freenet.co.uk (Rob Williscroft)
Date: Tue, 12 May 2009 01:56:50 -0500
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
	<guao50$1jv$1@panix3.panix.com>
Message-ID: <Xns9C09513903E8FrtwfreenetREMOVEcouk@216.196.109.145>

Aahz wrote in news:guao50$1jv$1 at panix3.panix.com in comp.lang.python:

> In article <Xns9C08E179B66D8rtwfreenetREMOVEcouk at 216.196.109.145>,
> Rob Williscroft  <rtw at freenet.co.uk> wrote:
>>
>>db.execute( '''
>>         update "sessions" set "uid" = ?
>>         where "uid" = ? 
>>         and exists(
>>                  select * from "users" where "uid" = ?
>>           )
>>    ''',
>>    (v['uid'],s.SID, v['uid']) 
>>  )
> 
> This will be more efficient if you do "select uid from users".

What will be more efficient ?

Do you mean the "select * ..." or do you want to take the exists 
sub-query out and put it in a python if ? 

Rob.
-- 
http://www.victim-prime.dsl.pipex.com/


From michele.simionato at gmail.com  Tue May 12 03:01:10 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Tue, 12 May 2009 00:01:10 -0700 (PDT)
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com> 
	<gu8u7s$l1$1@news.lysator.liu.se>
	<Xns9C08A5D9BCFA1duncanbooth@127.0.0.1> 
	<gu954t$29r$1@news.lysator.liu.se> <gu9jo6$9bk$01$1@news.t-online.com> 
	<guapa7$eri$1@news.lysator.liu.se>
Message-ID: <0601fa8d-00af-41fe-86f7-5bb210ec268c@o14g2000vbo.googlegroups.com>

On May 12, 8:54?am, Mikael Olofsson <mik... at isy.liu.se> wrote:
> Peter Otten wrote:
> > I usually use decorator functions, but I think the following should work,
> > too:
>
> > class deco(object):
> > ? ? def __init__(self, func):
> > ? ? ? ? self._func = func
> > ? ? def __call__(self, *args):
> > ? ? ? ? print "Decorator:", args
> > ? ? ? ? self._func(*args)
> > ? ? def __get__(self, *args):
> > ? ? ? ? return deco(self._func.__get__(*args))
>
> This looks like a winner to me. It is elegant, works for functions as
> well as for methods, and does not mess with the internals of the
> decorator which avoids the problems that Duncan pointed out.

Still it turns something which is a function into an object and you
lose the
docstring and the signature. pydoc will not be too happy with this
approach.


From deets at nospam.web.de  Tue May 12 03:09:46 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 12 May 2009 09:09:46 +0200
Subject: how to consume .NET webservice
In-Reply-To: <guaf4j$1fsn$1@adenine.netfront.net>
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net>
	<76rnq5F1dp6gpU1@mid.uni-berlin.de>
	<guaf4j$1fsn$1@adenine.netfront.net>
Message-ID: <76sllsF1eju82U1@mid.uni-berlin.de>

namekuseijin schrieb:
> Diez B. Roggisch wrote:
>> namekuseijin schrieb:
>>> bav escreveu:
>>>> question from a python newbie;
>>>>
>>>>   how can i consume in python language, a .NET web service, passing
>>>>   a string array as parameter in some easy steps?
>>>
>>> Unless Microsoft extended the standard in any way, then it should be 
>>> just as you consume any web service, I guess. ;)
>>
>> Microsoft *created* the standard.. 
> 
> No:


Yes:

http://webservices.xml.com/pub/a/ws/2001/04/04/soap.html

MS created it. That it *became* a standard of the W3C later - well, they 
did that with OOXML as well...

Diez


From deets at nospam.web.de  Tue May 12 03:12:21 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 12 May 2009 09:12:21 +0200
Subject: how to consume .NET webservice
In-Reply-To: <guaf4j$1fsn$1@adenine.netfront.net>
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net>
	<76rnq5F1dp6gpU1@mid.uni-berlin.de>
	<guaf4j$1fsn$1@adenine.netfront.net>
Message-ID: <76slqnF1ehacbU1@mid.uni-berlin.de>

namekuseijin schrieb:
 > Diez B. Roggisch wrote:
 >> namekuseijin schrieb:
 >>> bav escreveu:
 >>>> question from a python newbie;
 >>>>
 >>>>   how can i consume in python language, a .NET web service, passing
 >>>>   a string array as parameter in some easy steps?
 >>>
 >>> Unless Microsoft extended the standard in any way, then it should 
be just as you consume any web service, I guess. ;)
 >>
 >> Microsoft *created* the standard..
 >
 > No:


Yes:

http://webservices.xml.com/pub/a/ws/2001/04/04/soap.html

MS created it. That it *became* a standard of the W3C later - well, they 
did that with OOXML as well...

Diez


From deets at nospam.web.de  Tue May 12 03:14:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 12 May 2009 09:14:33 +0200
Subject: how to consume .NET webservice
In-Reply-To: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
Message-ID: <76sluqF1ehacbU2@mid.uni-berlin.de>

bav schrieb:
> question from a python newbie;
> 
>   how can i consume in python language, a .NET web service, passing
>   a string array as parameter in some easy steps?

Try accessing the .NET-service using a .NET client, and capture the 
traffic (it speaks volumes that the apache axis project offers a 
HTTP-proxy for exactly that purposes, tcpmon). Then use an 
XML-templating language such as genshi & create the messages yourself.

Sounds awkward and complicated? It is. As I said in another post: the 
"S" stands for simple...

Diez


From davea at ieee.org  Tue May 12 03:24:18 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 12 May 2009 03:24:18 -0400
Subject: piping input to an external script
In-Reply-To: <gu9pbe$csc$1@foggy.unx.sas.com>
References: <gu9pbe$csc$1@foggy.unx.sas.com>
Message-ID: <4A092422.50100@ieee.org>

Tim Arnold wrote:
> Hi, I have some html files that I want to validate by using an external 
> script 'validate'. The html files need a doctype header attached before 
> validation. The files are in utf8 encoding. My code:
> ---------------
> import os,sys
> import codecs,subprocess
> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
>
> filename  = 'mytest.html'
> fd = codecs.open(filename,'rb',encoding='utf8')
> s = HEADER + fd.read()
> fd.close()
>
> p = subprocess.Popen(['validate'],
>                     stdin=subprocess.PIPE,
>                     stdout=subprocess.PIPE,
>                     stderr=subprocess.STDOUT)
> validate = p.communicate(unicode(s,encoding='utf8'))
> print validate
> ---------------
>
> I get lots of lines like this:
> Error at line 1, character 66:\tillegal character number 0
> etc etc.
>
> But I can give the command in a terminal 'cat mytest.html | validate' and 
> get reasonable output. My subprocess code must be wrong, but I could use 
> some help to see what the problem is.
>
> python2.5.1, freebsd6
> thanks,
> --Tim
>
>
>
>   
The usual rule in debugging:  split the problem into two parts, and test 
each one separately, starting with the one you think most likely to be 
the culprit

In this case the obvious place to split is with the data you're passing 
to the  communicate call.  I expect it's already wrong, long before you 
hand it to the subprocess.  So write it to a file instead, and inspect 
it with a binary file viewer.  And of course test it manually with your 
validate program.  Is validate really expecting a Unicode stream in stdin ?




From mail at timgolden.me.uk  Tue May 12 03:26:37 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 12 May 2009 08:26:37 +0100
Subject: Complete frustration
In-Reply-To: <4A08C32D.3020904@ieee.org>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>	<4A085B14.2060908@hughes.net>
	<4A08C32D.3020904@ieee.org>
Message-ID: <4A0924AD.3080201@timgolden.me.uk>

Dave Angel wrote:

[... snip sound advice about file associations etc. ...]

One thing to bear in mind is that any settings, however obtained,
in the User part of the registry (HKCU\Software\....) will override
those in the Machine part of the registry (HKLM\Software...). If
you think you've set things correctly and you're still not seeing
the effect, check under HKCU to see if there's something there
which would override things.

TJG


From tadwelessar at gmail.com  Tue May 12 04:15:48 2009
From: tadwelessar at gmail.com (Matteo)
Date: Tue, 12 May 2009 01:15:48 -0700 (PDT)
Subject: Fill Javascript form
References: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>
	<mailman.3.1242076014.8015.python-list@python.org>
Message-ID: <a91b7799-953e-4751-b18b-791b1a378794@l28g2000vba.googlegroups.com>

On 11 Mag, 23:06, Shawn Milochik <Sh... at Milochik.com> wrote:
> How is the form "written in JavaScript"? Is it dynamically generated?
>
> In any case, can you just send a POST request if you know the values required?

The problem is indeed that the form is dynamically generated.
That's the .js file:

if (navigator.appVersion.indexOf("MSIE")!=-1)
document.write("<script type='text/javascript' id='chillicontroller'></
script>");

if (!window.queryObj) {
    window.queryObj = new Object();
    window.location.search.replace(new RegExp("([^?=&]+)(=([^&]
*))?","g"), function($0,$1,$2,$3) { queryObj[$1] = $3; });
    if (queryObj['uamip'] == null && queryObj['uamport'] == null)
{queryObj['uamip']='10.192.0.1';queryObj['uamport']='3990';}
}

if (queryObj['uamip'] != null && queryObj['uamport'] != null) {
    var script = document.getElementById('chillicontroller');
    if (script == null) {
  // 	document.write('manutenzione');
	script = document.createElement('script');
	script.id = 'chillicontroller';
	script.type = 'text/javascript';
    	script.src = 'http://'+queryObj['uamip']+':3990/www/
chillijs.chi';

    	var head = document.getElementsByTagName("head")[0];
    	if (head == null) head = document.body;
	head.appendChild(script);
   }
   script=document.getElementById('chillicontroller');
   if(script==null)document.write('manutenzione');
    script.src = 'http://'+queryObj['uamip']+':3990/www/chillijs.chi';

} else {
//document.write('manutenzione');
    var noLocation = document.getElementById("noLocation");
    if (noLocation != null && noLocation.style) {
       noLocation.style.display = 'inline';
    }
}



From jeremiah.dodds at gmail.com  Tue May 12 04:18:51 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Tue, 12 May 2009 09:18:51 +0100
Subject: Your Favorite Python Book
In-Reply-To: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
Message-ID: <12cbbbfc0905120118s34c688f7tf30519b9e0d4a755@mail.gmail.com>

On Mon, May 11, 2009 at 9:44 PM, Sam Tregar <sam at tregar.com> wrote:

> Greetings.  I'm working on learning Python and I'm looking for good books
> to read.  I'm almost done with Dive into Python and I liked it a lot. I
> found Programming Python a little dry the last time I looked at it, but I'm
> more motivated now so I might return to it.  What's your favorite?  Why?
>
> -sam
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
I've gotten great use out of Programming Python (mainly because it has a lot
of larger full-fledged examples), Python in a Nutshell, and recently Expert
Python Programming. My copy of Python in a Nutshell is particularly
dog-eared now - it is a bit outdated (I've got notes all over the book of
things that have changed...) but it's still a great resource.
-------------- next part --------------
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From ldo at geek-central.gen.new_zealand  Tue May 12 04:23:25 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 20:23:25 +1200
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com>
Message-ID: <gubblt$igm$4@lust.ihug.co.nz>

In message <gu7f97$mt6$2 at reader1.panix.com>, kj wrote:

> I know about the construct:
> 
> try:
>     # do something
> except ...:
>     # handle exception
> else:
>     # do something else
> 
> ...but I can't come with an example in which the same couldn't be
> accomplished with [no else]

I'd agree. If you have to resort to a "try .. else", then might I 
respectfully suggest that you're using exceptions in a way that's 
complicated enough to get you into trouble.



From duncan.booth at invalid.invalid  Tue May 12 04:25:59 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 12 May 2009 08:25:59 GMT
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
	<gu8u7s$l1$1@news.lysator.liu.se>
	<Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>
	<gu954t$29r$1@news.lysator.liu.se>
	<gu9jo6$9bk$01$1@news.t-online.com>
	<guapa7$eri$1@news.lysator.liu.se>
	<0601fa8d-00af-41fe-86f7-5bb210ec268c@o14g2000vbo.googlegroups.com>
Message-ID: <Xns9C095F0E58B75duncanbooth@127.0.0.1>

Michele Simionato <michele.simionato at gmail.com> wrote:

> On May 12, 8:54?am, Mikael Olofsson <mik... at isy.liu.se> wrote:
>> Peter Otten wrote:
>> > I usually use decorator functions, but I think the following should
>> > wor 
> k,
>> > too:
>>
>> > class deco(object):
>> > ? ? def __init__(self, func):
>> > ? ? ? ? self._func = func
>> > ? ? def __call__(self, *args):
>> > ? ? ? ? print "Decorator:", args
>> > ? ? ? ? self._func(*args)
>> > ? ? def __get__(self, *args):
>> > ? ? ? ? return deco(self._func.__get__(*args))
>>
>> This looks like a winner to me. It is elegant, works for functions as
>> well as for methods, and does not mess with the internals of the
>> decorator which avoids the problems that Duncan pointed out.
> 
> Still it turns something which is a function into an object and you
> lose the
> docstring and the signature. pydoc will not be too happy with this
> approach.

Also it means every time the decorator is invoked 'self' references a 
new instance of deco. I don't know why Mikael wants to use a class 
rather than a function but if he wants to save state between calls this 
isn't going to help.

Something like this may work, and preserves the function name, type and 
docstring:

from functools import wraps
class Decorator(object):
    def __init__(self, func):
        self._func = func

    def __new__(cls, func):
        decorator = object.__new__(cls)
        decorator.__init__(func)
        @wraps(func)
        def wrapper(*args, **kwds):
            return decorator(*args, **kwds)
        return wrapper

class deco(Decorator):
    def __init__(self, func):
        self.calls = 0
        Decorator.__init__(self, func)
        
    def __call__(self, *args):
        self.calls += 1
        print "Decorator:", args, "called", self.calls, "times"
        return self._func(*args)

class C(object):
    @deco
    def meth(self, arg):
        """meth's docstring"""
        print "meth %r %r" % (self, arg)
        return arg+1

inst1 = C()
inst2 = C()
print repr(inst1.meth), inst1.meth.__doc__

print inst1.meth(5)
print inst1.meth(inst2.meth(3))

-------------------
Output:
<bound method C.meth of <__main__.C object at 0x00B45390>> meth's 
docstring
Decorator: (<__main__.C object at 0x00B45390>, 5) called 1 times
meth <__main__.C object at 0x00B45390> 5
6
Decorator: (<__main__.C object at 0x00B453D0>, 3) called 2 times
meth <__main__.C object at 0x00B453D0> 3
Decorator: (<__main__.C object at 0x00B45390>, 4) called 3 times
meth <__main__.C object at 0x00B45390> 4
5


-- 
Duncan Booth http://kupuguy.blogspot.com


From steven at REMOVE.THIS.cybersource.com.au  Tue May 12 04:31:09 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 May 2009 08:31:09 GMT
Subject: dict would be very slow for big data
References: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>
Message-ID: <pan.2009.05.12.08.31.09@REMOVE.THIS.cybersource.com.au>

On Mon, 11 May 2009 20:28:13 -0700, forrest yang wrote:

> hi
> i am trying to insert a lot of data into a dict, which may be 10,000,000
> level.
> after inserting 100000 unit, the insert rate become very slow, 50,000/
> s, and the entire time used for this task would be very long,also. would
> anyone know some solution for this case?

You don't give us enough information to answer.


How are you generating the data?

What are the keys and the values?

Are you sure it is slow to insert into the dict, or could some other part 
of your processing be slow?

Does performance change if you turn garbage collection off?

import gc
gc.disable()
# insert your items
gc.enable()


Can you show us a sample of the data, and the code you are using to 
insert it into the dict?

Do you have enough memory? If you run an external process like top, can 
you see memory exhaustion, CPU load or some other problem?




-- 
Steven


From jeremiah.dodds at gmail.com  Tue May 12 04:34:40 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Tue, 12 May 2009 09:34:40 +0100
Subject: Fill Javascript form
In-Reply-To: <a91b7799-953e-4751-b18b-791b1a378794@l28g2000vba.googlegroups.com>
References: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>
	<mailman.3.1242076014.8015.python-list@python.org>
	<a91b7799-953e-4751-b18b-791b1a378794@l28g2000vba.googlegroups.com>
Message-ID: <12cbbbfc0905120134w301c3175x2f0a3256ede80d1e@mail.gmail.com>

On Tue, May 12, 2009 at 9:15 AM, Matteo <tadwelessar at gmail.com> wrote:

> On 11 Mag, 23:06, Shawn Milochik <Sh... at Milochik.com> wrote:
> > How is the form "written in JavaScript"? Is it dynamically generated?
> >
> > In any case, can you just send a POST request if you know the values
> required?
>
> The problem is indeed that the form is dynamically generated.
> That's the .js file:
>
> if (navigator.appVersion.indexOf("MSIE")!=-1)
> document.write("<script type='text/javascript' id='chillicontroller'></
> script>");
>
> if (!window.queryObj) {
>    window.queryObj = new Object();
>    window.location.search.replace(new RegExp("([^?=&]+)(=([^&]
> *))?","g"), function($0,$1,$2,$3) { queryObj[$1] = $3; });
>    if (queryObj['uamip'] == null && queryObj['uamport'] == null)
> {queryObj['uamip']='10.192.0.1';queryObj['uamport']='3990';}
> }
>
> if (queryObj['uamip'] != null && queryObj['uamport'] != null) {
>    var script = document.getElementById('chillicontroller');
>    if (script == null) {
>  //    document.write('manutenzione');
>        script = document.createElement('script');
>        script.id = 'chillicontroller';
>        script.type = 'text/javascript';
>        script.src = 'http://'+queryObj['uamip']+':3990/www/
> chillijs.chi';
>
>        var head = document.getElementsByTagName("head")[0];
>        if (head == null) head = document.body;
>        head.appendChild(script);
>   }
>   script=document.getElementById('chillicontroller');
>   if(script==null)document.write('manutenzione');
>    script.src = 'http://'+queryObj['uamip']+':3990/www/chillijs.chi';
>
> } else {
> //document.write('manutenzione');
>    var noLocation = document.getElementById("noLocation");
>    if (noLocation != null && noLocation.style) {
>       noLocation.style.display = 'inline';
>     }
> }
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


Use firebug or something similar (HTTPFox) to take a look at what you should
be sending as a post, and then just send that it your python script. Worst
case scenario is that you need to reverse-engineer a javascript-generated
session-id-type-thing, but that's pretty rare. Most likely, you don't even
need to grab the page.
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From bruno.42.desthuilliers at websiteburo.invalid  Tue May 12 04:35:42 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 12 May 2009 10:35:42 +0200
Subject: dict would be very slow for big data
In-Reply-To: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>
References: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>
Message-ID: <4a0934d8$0$11789$426a74cc@news.free.fr>

forrest yang a ?crit :
> hi
> i am trying to insert a lot of data into a dict, which may be
> 10,000,000 level.
> after inserting 100000 unit, the insert rate become very slow, 50,000/
> s, and the entire time used for this task would be very long,also.
> would anyone know some solution for this case?

Hint : computer's RAM is not an infinite resource.



From jason.heeris at gmail.com  Tue May 12 04:43:26 2009
From: jason.heeris at gmail.com (Jason)
Date: Tue, 12 May 2009 01:43:26 -0700 (PDT)
Subject: Is there a GUI for informing a user of missing dependencies?
Message-ID: <c84cea25-7c9f-40c8-aed3-5fe0d2e3a181@d19g2000prh.googlegroups.com>

I'm writing a small GUI (Python 2.5/6) using wxPython and pySerial.
Since these are both 3rd party modules, if a user doesn't have them
installed and tries to run the GUI from a file browser, the app will
fail silently. I'm hoping to avoid that.

Sure, I'll have a readme file, but I was wondering if there is an even
more direct way. I was going to roll my own (eg. very simple Tkinter
fallback error dialog if wxPython import fails, wxPython error dialog
if anything else is missing); but I was wondering if such a system
already exists out there.

? Jason


From ldo at geek-central.gen.new_zealand  Tue May 12 04:45:01 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 20:45:01 +1200
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
References: <mailman.5282.1241783298.11746.python-list@python.org>
	<gu6i38$jhk$1@panix3.panix.com>
	<mailman.5375.1241962005.11746.python-list@python.org>
	<gu9fr2$je5$1@panix3.panix.com>
	<mailman.5.1242076536.8015.python-list@python.org>
	<guagq9$361$1@lust.ihug.co.nz>
	<mailman.24.1242110221.8015.python-list@python.org>
Message-ID: <gubcud$jf9$1@lust.ihug.co.nz>

In message <mailman.24.1242110221.8015.python-list at python.org>, Geoff 
Gardiner wrote:

> Lawrence D'Oliveiro wrote:
>
>> .. I expect an apology.
>> Otherwise, it becomes grounds for an abuse complaint to your ISP.
>>   
> Yes, I do apologize profusely and publicly ...

Thank you.



From martin at librador.com  Tue May 12 04:57:34 2009
From: martin at librador.com (Martin Vilcans)
Date: Tue, 12 May 2009 10:57:34 +0200
Subject: Nimrod programming language
In-Reply-To: <159308160@web.de>
References: <159308160@web.de>
Message-ID: <f782707a0905120157q6dbcfa9am3075c4916459dbf9@mail.gmail.com>

On Fri, May 8, 2009 at 5:48 PM, Andreas Rumpf <Rumpf_A at web.de> wrote:
> Dear Python-users,
>
> I invented a new programming language called "Nimrod" that combines Python's readability with C's performance. Please check it out: http://force7.de/nimrod/
> Any feedback is appreciated.

Nice with a language with a new language designed for high
performance. It seems like a direct competitor with D, i.e. a
high-level language with low-level abilities. The Python-like syntax
is a good idea.

There are two showstoppers for me though:

1. Introducing a new programming language where the char type is a
byte is anachronistic. You're saying that programmers don't have to
care about the string encoding and can just treat them as an array of
bytes. That is exactly what causes all the problems with applications
that haven't been designed to handle anything but ASCII. If you're
doing any logic with strings except dumb reading and writing, you
typically *have to* know the encoding. Forcing programmers to be aware
of this problem is a good idea IMO.

You can certainly have a string type that uses byte arrays in UTF-8
encoding internally, but your string functions should be aware of that
and treat it as a unicode string. The len function and index operators
should count characters, not bytes. Add a byte array data type for
byte arrays instead.

2. The dynamic dispatch is messy. I agree that procedural is often
simpler and more efficient than object-oriented programming, but
object-oriented programming is useful just as often and should be made
a simple as possible. Since Nimrod seems flexible, perhaps it would be
possible to implement an object-orientation layer in Nimrod that hides
the dynamic dispatch complexity?

-- 
martin at librador.com
http://www.librador.com


From steven at REMOVE.THIS.cybersource.com.au  Tue May 12 05:20:36 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 May 2009 09:20:36 GMT
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz>
Message-ID: <pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>

On Tue, 12 May 2009 20:23:25 +1200, Lawrence D'Oliveiro wrote:

> In message <gu7f97$mt6$2 at reader1.panix.com>, kj wrote:
> 
>> I know about the construct:
>> 
>> try:
>>     # do something
>> except ...:
>>     # handle exception
>> else:
>>     # do something else
>> 
>> ...but I can't come with an example in which the same couldn't be
>> accomplished with [no else]
> 
> I'd agree. If you have to resort to a "try .. else", then might I
> respectfully suggest that you're using exceptions in a way that's
> complicated enough to get you into trouble.



try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available')
    raise
else:
    do_something_with(rsrc)
finally:
    rsrc.close()



is complicated? It seems pretty straightforward to me.



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Tue May 12 05:35:36 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 May 2009 09:35:36 GMT
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz>
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>

On Tue, 12 May 2009 09:20:36 +0000, Steven D'Aprano wrote:

> On Tue, 12 May 2009 20:23:25 +1200, Lawrence D'Oliveiro wrote:
> 
>> In message <gu7f97$mt6$2 at reader1.panix.com>, kj wrote:
>> 
>>> I know about the construct:
>>> 
>>> try:
>>>     # do something
>>> except ...:
>>>     # handle exception
>>> else:
>>>     # do something else
>>> 
>>> ...but I can't come with an example in which the same couldn't be
>>> accomplished with [no else]
>> 
>> I'd agree. If you have to resort to a "try .. else", then might I
>> respectfully suggest that you're using exceptions in a way that's
>> complicated enough to get you into trouble.
> 
> 
> 
> try:
>     rsrc = get(resource)
> except ResourceError:
>     log('no more resources available')
>     raise
> else:
>     do_something_with(rsrc)
> finally:
>     rsrc.close()



Except of course such a pattern won't work, because if get(resource) 
fails, rsrc will not exist to be closed. So a better, and simpler, 
example would be to drop the finally clause:

try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available')
    raise
else:
    do_something_with(rsrc)
    rsrc.close()


To really be safe, that should become:

try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available')
    raise
else:
    try:
        do_something_with(rsrc)
    finally:
        rsrc.close()


which is now starting to get a bit icky (but only a bit, and only because 
of the nesting, not because of the else).



-- 
Steven


From karlosbarlos at yahoo.com  Tue May 12 05:54:16 2009
From: karlosbarlos at yahoo.com (karlos barlos)
Date: Tue, 12 May 2009 02:54:16 -0700 (PDT)
Subject: No subject
Message-ID: <452312.52363.qm@web45506.mail.sp1.yahoo.com>

hello to all 

i have been using this script to add users to my active directory structure

i wise to make a loop in order for it to run for A large Number of Users 

can anyone give me some advice on the loop ??



import win32com,win32com.client
def add_acct(location,account):
??? 
? ad_obj=win32com.client.GetObject(location)
? ad_user=ad_obj.Create('user','cn='+user['login'])
? ad_user.Put('sAMAccountName',user['login'])
? ad_user.Put('userPrincipalName',user['login']+'@email.address.com')
? ad_user.Put('DisplayName',user['last']+' '+user['first']) #fullname
? ad_user.Put('givenName',user['first'])
? ad_user.Put('sn',user['last'])
? ad_user.Put('description','regular account')
? ad_user.Put('physicalDeliveryOfficeName','office 1')
? ad_user.Put('HomeDirectory',r'\\server1\ '[:-1]+user['login']) 
? ad_user.Put('HomeDrive','H:')
? ad_user.SetInfo();ad_user.GetInfo()
? ad_user.LoginScript='login.bat'
? ad_user.AccountDisabled=0
? ad_user.setpassword('the password')
? ad_user.Put('pwdLastSet',0) #-- force reset of password
? ad_user.SetInfo()


location='LDAP://OU=sales,DC=shay,DC=com'
user={'first':'shay','last':'smith','login':'shay123'}
add_acct(location,user)


location='LDAP://OU=sales,DC=shay,DC=com'
user={'first':'ron','last':'smith','login':'ron1267'}
add_acct(location,user)




      
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From mikael at isy.liu.se  Tue May 12 06:04:39 2009
From: mikael at isy.liu.se (Mikael Olofsson)
Date: Tue, 12 May 2009 12:04:39 +0200
Subject: Decorating methods - where do my arguments go?
In-Reply-To: <Xns9C095F0E58B75duncanbooth@127.0.0.1>
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
	<gu8u7s$l1$1@news.lysator.liu.se>
	<Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>
	<gu954t$29r$1@news.lysator.liu.se>
	<gu9jo6$9bk$01$1@news.t-online.com>
	<guapa7$eri$1@news.lysator.liu.se>
	<0601fa8d-00af-41fe-86f7-5bb210ec268c@o14g2000vbo.googlegroups.com>
	<Xns9C095F0E58B75duncanbooth@127.0.0.1>
Message-ID: <gub4ev$hfo$1@news.lysator.liu.se>

Michele Simionato wrote:
 > Still it turns something which is a function into an object and
 > you lose the docstring and the signature. pydoc will not be too
 > happy with this approach.

Duncan Booth wrote:
> I don't know why Mikael wants to use a class rather than a function
> but if he wants to save state between calls this isn't going to help.

I've never used decorators before, and that's the main reason for my 
confusion. I have found myself in a situation where I think that 
decorators is the way to go. So I tried to find information about how to 
write them the usual way: Googling and browsing documentation. I found 
examples using both functions and classes, but not much explanation of 
what's going on, especially not in the class case. I didn't find any 
arguments for favouring any of those alternatives. Actually, most 
examples I found did not even include the definition of the actual 
decorator or any information about where they might come from, only the 
@-row.

Based on the above observations, I assumed that both alternatives were 
equally possible. The first answers I got here also led me to believe 
that that was the case. My understanding is that in most cases, you can 
use a callable object instead of a function with little or no practical 
difference, except the syntax of its definition. In my eyes, a class 
definition looks nicer and is more readable than a nested function. 
Therefore, I tend to define a class with a __call__ method and helper 
methods instead of nested functions, if I find the need.

Practicality beats purity, and it seem like using a class for decoration 
is a lot more hassle than using a function. I fold.

/MiO


From python.list at tim.thechases.com  Tue May 12 06:21:15 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 12 May 2009 05:21:15 -0500
Subject: dict would be very slow for big data
In-Reply-To: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>
References: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>
Message-ID: <4A094D9B.5040303@tim.thechases.com>

> i am trying to insert a lot of data into a dict, which may be
> 10,000,000 level.
> after inserting 100000 unit, the insert rate become very slow, 50,000/
> s, and the entire time used for this task would be very long,also.
> would anyone know some solution for this case?

As others have mentioned, you've likely run out of RAM and the 
slowness you feel is your OS swapping your process to disk.

If you need fast dict-like access to your data, I'd recommend 
shifting to a database -- perhaps the stock "anydbm" module[1]. 
The only catch is that it only supports strings as keys/values. 
But Python makes it fairly easy to marshal objects in/out of 
strings.  Alternatively, you could use the built-in (as of 
Python2.5) sqlite3 module to preserve your datatypes and query 
your dataset with the power of SQL.

-tkc


[1]
http://docs.python.org/library/anydbm.html







From javier.collado at gmail.com  Tue May 12 06:52:00 2009
From: javier.collado at gmail.com (Javier Collado)
Date: Tue, 12 May 2009 12:52:00 +0200
Subject: Is there a GUI for informing a user of missing dependencies?
In-Reply-To: <c84cea25-7c9f-40c8-aed3-5fe0d2e3a181@d19g2000prh.googlegroups.com>
References: <c84cea25-7c9f-40c8-aed3-5fe0d2e3a181@d19g2000prh.googlegroups.com>
Message-ID: <c83cde5a0905120352s5f29acdwfb4a6650fe569766@mail.gmail.com>

Hello,

I'm not an expert, but if you use setuptools for your application,
then a 'install_requires' argument would do the job. For more
information, please take a look at:
http://peak.telecommunity.com/DevCenter/setuptools

Best regards,
    Javier

2009/5/12 Jason <jason.heeris at gmail.com>:
> I'm writing a small GUI (Python 2.5/6) using wxPython and pySerial.
> Since these are both 3rd party modules, if a user doesn't have them
> installed and tries to run the GUI from a file browser, the app will
> fail silently. I'm hoping to avoid that.
>
> Sure, I'll have a readme file, but I was wondering if there is an even
> more direct way. I was going to roll my own (eg. very simple Tkinter
> fallback error dialog if wxPython import fails, wxPython error dialog
> if anything else is missing); but I was wondering if such a system
> already exists out there.
>
> ? Jason
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From ldo at geek-central.gen.new_zealand  Tue May 12 06:58:12 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 22:58:12 +1200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<02159679$0$20647$c3e8da3@news.astraweb.com>
	<towb-4F1754.17464609052009@news.individual.de>
Message-ID: <gubko4$nov$2@lust.ihug.co.nz>

In message <towb-4F1754.17464609052009 at news.individual.de>, Tobias Weber 
wrote:

> In article <02159679$0$20647$c3e8da3 at news.astraweb.com>,
>  Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:
> 
>> Maybe in another 20 years, nobody will care about low-level details like
>> the characters used to write code. Only the tokens really matter.
> 
> You could have that ten years ago with AppleScript. Gets annoying
> quickly...

To me, the annoying thing about the AppleScript Script Editor wasn't the 
tokenization, it was its insistence on overriding my decisions about where 
to continue a line.



From ldo at geek-central.gen.new_zealand  Tue May 12 07:00:17 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 23:00:17 +1200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
Message-ID: <gubks1$nov$3@lust.ihug.co.nz>

In message <towb-63CE3D.09322210052009 at news.individual.de>, Tobias Weber 
wrote:

> (still not gonna use software that doesn't let me type # because it's
> alt+3 on a UK layout; having to re-learn or configure that is just sick)

Tried typing compose-plus-plus?



From bearophileHUGS at lycos.com  Tue May 12 07:01:08 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 12 May 2009 04:01:08 -0700 (PDT)
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.29.1242119171.8015.python-list@python.org>
Message-ID: <b8c43ff9-bbe3-46ad-b98c-0a0d94c7723d@s31g2000vbp.googlegroups.com>

Martin Vilcans:
> Nice with a language with a new language designed for high
> performance. It seems like a direct competitor with D, i.e. a
> high-level language with low-level abilities.
> The Python-like syntax is a good idea.

There is Delight too:
http://delight.sourceforge.net/

But I agree, one disadvantage (and one advantage) the D language is
its significant syntactic and semantic compatibility with C.
I like the syntax of Nimrod, but I think Nimrod designer has to work
more on data parallelism and higher level forms of parallelism.
At the moment D language has not enough data parallelism features for
scientific programming purposes.

Bye,
bearophile


From ldo at geek-central.gen.new_zealand  Tue May 12 07:03:16 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 23:03:16 +1200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
	<mailman.5400.1242000728.11746.python-list@python.org>
	<slrnh0fqu4.qcl.nick@irishsea.home.craig-wood.com>
Message-ID: <gubl1l$nov$4@lust.ihug.co.nz>

In message <slrnh0fqu4.qcl.nick at irishsea.home.craig-wood.com>, Nick Craig-
Wood wrote:

> Rhodri James <rhodri at wildebst.demon.co.uk> wrote:
>
>>  Emacs is my editor of choice ...
> 
> You probably haven't used MAC OS X then!

I tried using Emacs via SSH from a Mac once. Made me run screaming for the 
nearest Windows box 
<http://groups.google.co.nz/group/comp.sys.mac.advocacy/msg/dfad8bff6942e749>.



From aotto1968 at onlinehome.de  Tue May 12 07:08:28 2009
From: aotto1968 at onlinehome.de (Andreas Otto)
Date: Tue, 12 May 2009 13:08:28 +0200
Subject: ANNOUNCE: libmsgque 3.1
Message-ID: <gublbc$810$01$3@news.t-online.com>

ANNOUNCE a major feature improvement of libmsgque ...


What is LibMsgque
=================

LibMsgque is an OS independent, Programming Language independent and
Hardware independent solution to link applications together to act like a
single application. Or with other words, LibMsgque is an Application-Server
toolkit.


Highlights of the current Release:
=================================

This release introduce a couple of highlights into the LibMsgque World
including the Python 3.01 support and a brand new Tcl/Java interface

As bonus an C/Tcl/Java/Python performance test was added using the
following conditions:

  1. same basic native library -> libmsgque (written in C)
  2. same user -> me
  3. same performance management tool
  4. same code workflow using the native language interface
        to link libmsgque with a language specific service
        handler
  5. testing the following aspects:
        a) application startup/shutdown performance
        b) synchronous and asynchronous transaction performance
        c) spawn, fork and thread process creation performance

  -> results: http://libmsgque.sourceforge.net/performance.htm


Programmer-Visible-Changes:
===========================

Add Python 3.01 support
  This is the next step to provide an OS and programming language
  independent solution

New Tcl and Java Library binding
  Now Tcl, Java and Python using the same function namespace
  to improve the cross language code readability

C library improvement including better error checking support
  Add more error-case checking

Add new test hardware, apple iBook (ppc) running Debian 5
  Put my old iBook back to live

Re-Add big/little endian support
  Now be able to test endianness

Improve 32Bit/64Bit support
  Code Cleanup

Add new documentation
  Entire new documentation and examples were added


The Web-Site was updated:
=========================

   -> http://libmsgque.sourceforge.net

  For a fast introduction use the following URL:

   -> http://libmsgque.sourceforge.net/features.htm



mfg

  Andreas Otto


From samwyse at gmail.com  Tue May 12 07:45:41 2009
From: samwyse at gmail.com (samwyse)
Date: Tue, 12 May 2009 04:45:41 -0700 (PDT)
Subject: creating classes with mix-ins
References: <d6409bb3-f2ed-4964-942a-b0698060a7f0@e24g2000vbe.googlegroups.com>
	<fe808a4d-26e0-4003-be1a-2e768d7d81cc@r13g2000vbr.googlegroups.com>
Message-ID: <5c569b1b-5804-41e5-b384-149f67475af4@m24g2000vbp.googlegroups.com>

On May 11, 9:01?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 11, 11:16?am, samwyse <samw... at gmail.com> wrote:
>
> > Should I use a class decorator, or a metaclass?
>
> Here's the thing: unless you have advance knowledge of the methods
> defined by self.blog, you can't get the attr_list at class definition
> time, which means neither the metaclass nor the decorator would be a
> good approach. ?If that's the case, you should define newPost,
> editPost, and whatever other methods of self.blog as ordinary
> attributes of self, within the init function. ?boilerplate would be
> the same except you would pass self to it and allow template to use it
> from its nested scope (it would no longer be an instance method since
> it's an ordinary attribute).
>
> If you do know what the methods of self.blog will be, then that's
> where you get attr_list from. ?So, for instance, if blogHandler always
> returns an object of type Blog, then you could inspect Blog's type
> dict to see what methods are defined in it; in fact you probably want
> to check the whole MRO for Blog, like this (untested):
>
> attr_list = []
> for cls in Blog.__mro__:
> ? ? for value in cls.__dict__:
> ? ? ? ? if is_wrapped_method(value):
> ? ? ? ? ? ? attr_list.append(value)
>
> A metaclass is probably overkill to assign the wrapped blog methods.
> I probably wouldn't even bother with the decorator, and just write the
> loop after the class definition. ?Then you can use MetaBlog directly
> for klass.
>
> class MetaBlog(object):
> ? ? ...
>
> for what in attr_list:
> ? ? setattr(MetaBlog, what, boilerplate(what))
>
> If it were the kind of thing I found myself doing often I'd refactor
> into a decorator.

Unfortunately, 'boilerplate()' uses the handlers that I provide when
MetaBlog is instantiated.  I tried the following, but it didn't work
(for reasons that were obvious in retrospect).

def instantiate_template(m_name, instance):
    isAuthorised = instance.security.isAuthorised
    method_to_wrap = getattr(instance.blog, m_name)
    def template(self, which, username, password, *args):
        if not isAuthorised(username, password, which, m_name):
            raise Exception('Unauthorised access')
        return method_to_wrap(which, *args)
    template.__name__ = method_to_wrap.__name__
    template.__doc__ = method_to_wrap.__doc__
    return template

class MetaWeblog(object):
    def __init__(self,
                 securityHandler=SimpleSecurityHandler,
                 blogHandler=SimpleBlogHandler):
        self.security = securityHandler()
        self.blog = blogHandler()
        # from http://www.xmlrpc.com/metaWeblogApi
        m_prefix = 'metaWeblog.'
        m_list = ('newPost', 'editPost', 'getPost', 'newMediaObject',
                  'getCategories', 'getRecentPosts', )

        # Here's where things fell apart
        for m_name in m_list:
            dotted_name = m_prefix + m_name
            method = instantiate_template(m_name, self)
            setattr(self, dotted_name, method)

So, I replaced that last for-loop with this:

        # Since we're about to monkey-patch the class, we should
        # make certain that all instances use the same handlers.
        handlers = (self.security, self.blog)
        try:
            assert getattr(self.__class__, '_handlers') == handlers
        except AttributeError:
            for m_name in m_list:
                dotted_name = m_prefix + m_name
                method = instantiate_template(m_name, self)
                setattr(self.__class__, dotted_name, method)
            setattr(self.__class__, '_handlers', handlers)

This is good enough for now, since I can't conceive of a reason why
MetaBlog would be instantiated more than once.  If it were, on the
other hand, it would probably be because you wanted to use different
handlers.  In that case, I think I'd want to use a class factory,
something like this:
    server.register_instance(
        MetaWeblogFactory(securityHandler, blogHandler)()
    )

Anyway, thanks for getting me over a conceptual hump.


From rahul03535 at gmail.com  Tue May 12 07:51:18 2009
From: rahul03535 at gmail.com (rahul)
Date: Tue, 12 May 2009 04:51:18 -0700 (PDT)
Subject: Python API Functions equivalent to  ruby's  rb_big2str() and 
	rb_str2cstr()
Message-ID: <1553614d-4485-4b46-a779-08b4040071f8@d38g2000prn.googlegroups.com>

Is functions equivalent to ruby's  rb_big2str() and rb_str2cstr()
available in Python.
I had search a lot in google but not able to find that.
If anybody know than please give me the name of those functions of
Python.


From david.geldreich at free.fr  Tue May 12 07:53:39 2009
From: david.geldreich at free.fr (r2d3)
Date: Tue, 12 May 2009 04:53:39 -0700 (PDT)
Subject: Compiling Python on Windows : how to deal with modules ?
References: <b83cb71b-791d-473a-b312-f7643a798f19@s28g2000vbp.googlegroups.com>
Message-ID: <8234b79f-9d0b-4f66-b8b1-fa99161b83a0@j12g2000vbl.googlegroups.com>

Hi all,

after some investigation, I managed to find how to do this "manually".
I post it here if it could help others...

1) on windows, mostly all the dynamic libraries (time, socket, ...)
are statically linked into python26.dll
2) all the modules are located in lib/ and some .pyd (in fact renamed
dll files) live in PCbuild
3) "PCBuild\python -m compileall lib" will compile all the .py under
lib which then could by zipped into a single python26.zip

So I will just need to distribute python26.dll and python26.zip with
my app and set sys.path (using PySys_SetPath) to point to python26.zip
+ the place where I store the .pyd.

I will solve the "user want to add other module" later using
PYTHONPATH or allowing the user to add python path through our GUI.

Best regards.

On 11 mai, 10:49, r2d3 <david.geldre... at free.fr> wrote:
> I am using Python embedded in my application (OSX,Windows) and I need
> to distribute Python as part of my application.
>
> On OSX, no problem, I got a self contained framework (with dynamic
> library and all the modules).
>
> On Windows, I manage to compile Python 2.6.2 with PCbuild\build.bat
> and I get python26.dll/python26_d.dll.
>
> But the readme gives no clue about how to deal with the module
> "compilation"/installation.
>
> So how do I "compile"/package all the modules that comes with Python
> source distribution on Windows ? To embed it in my distribution, I
> just copy the whole Modules tree (only pyc/pyo/pyd files ?) ? and set
> the right sys.path from my C code (using PySys_SetPath) ?


From ronn.ross at gmail.com  Tue May 12 07:54:35 2009
From: ronn.ross at gmail.com (Ronn Ross)
Date: Tue, 12 May 2009 07:54:35 -0400
Subject: Sorting a dictionary
Message-ID: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>

I'm attempting to sort for the results of a dictionary. I would like to
short by the 'key' in ascending order. I have already made several attempts
using: sorted() and .sort().
Here is my loop:
    for key,value in word_count.items():
        print sorted(key), "=", value

Thanks
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From jenn.duerr at gmail.com  Tue May 12 07:58:59 2009
From: jenn.duerr at gmail.com (noydb)
Date: Tue, 12 May 2009 04:58:59 -0700 (PDT)
Subject: putting date strings in order
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>
	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
Message-ID: <d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>

On May 11, 11:30?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> noydb <jenn.du... at gmail.com> writes:
> > Anyone have any good ideas? ?I was curious to see what people came up
> > with.
>
> Is this a homework assignment? ?Some hints:
>
> 1) figure out how to compare two month names for chronological order,
> ? ?leaving out the issue of the starting month not being january.
> 2) figure out how to adjust for the starting month. ?The exact
> ? ?semantics of the "%" operator might help do this concisely.

Ha!  No, this is not a homework assignment.  I just find myself to be
not the most eloquent and efficient scripter and wanted to see how
others would approach it.

I'm not sure how I follow your suggestion.  I have not worked with the
%.  Can you provide a snippet of your idea in code form?

I thought about assigning a number string (like 'x_1') to any string
containing 'jan' -- so x_jan would become x_1, and so on.  Then I
could loop through with a counter on the position of the number (which
is something i will need to do, comparing one month to the next
chronological month, then that next month to its next month, and so
on).  And as for the starting postion, the user could declare, ie, aug
the start month.  aug is position 8.  therefore subtract 7 from each
value, thus aug becomes 1.... but then I guess early months would have
to be add 5, such that july would become 12.  Ugh, seems sloppy to me.

Something like that....   seems poor to me.  Anybody have a bteer
idea, existing code???


From andreengels at gmail.com  Tue May 12 08:04:10 2009
From: andreengels at gmail.com (Andre Engels)
Date: Tue, 12 May 2009 14:04:10 +0200
Subject: Sorting a dictionary
In-Reply-To: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>
References: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>
Message-ID: <6faf39c90905120504r1aae3527jead4506e32b42b32@mail.gmail.com>

On Tue, May 12, 2009 at 1:54 PM, Ronn Ross <ronn.ross at gmail.com> wrote:
> I'm attempting to sort for the results of a dictionary. I would like to
> short by the 'key' in ascending order. I have already made several attempts
> using: sorted() and .sort().
> Here is my loop:
> ??? for key,value in word_count.items():
> ??? ??? print sorted(key), "=", value

That won't work. "key" will each time be the specific key, which you
then try to sort. Instead you want to sort the _set_ of pairs by their
first element. Luckily the default sort order of a tuple is by the value
of its first element, so you can do:

for key,value in sorted(word_count.items()):
   print key, "=", value





-- 
Andr? Engels, andreengels at gmail.com


From aqeelahmed821 at gmail.com  Tue May 12 08:16:06 2009
From: aqeelahmed821 at gmail.com (Aqeel Ahmed Rajpar)
Date: Tue, 12 May 2009 05:16:06 -0700 (PDT)
Subject: EURO NEWS FINALLY LAUNCHED THEIR BLOG
Message-ID: <48154f6e-2429-44c3-a5e6-cc6b447caf1a@y6g2000prf.googlegroups.com>

TO SUBSCRIBE THE BLOG VIA EMAIL VISIT

www.euronewspk.blogspot.com


From jaime.frio at gmail.com  Tue May 12 08:17:54 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Tue, 12 May 2009 14:17:54 +0200
Subject: Sorting a dictionary
In-Reply-To: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>
References: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>
Message-ID: <97a8f1a70905120517q5be1fbb2u1532d5923b721404@mail.gmail.com>

This one I think I know... Try with:

for k in sorted(word_count) :
    print k,"=",word_count[k]

You need to do the sorting before iterating over the keys...

Jaime

On Tue, May 12, 2009 at 1:54 PM, Ronn Ross <ronn.ross at gmail.com> wrote:
> I'm attempting to sort for the results of a dictionary. I would like to
> short by the 'key' in ascending order. I have already made several attempts
> using: sorted() and .sort().
> Here is my loop:
> ??? for key,value in word_count.items():
> ??? ??? print sorted(key), "=", value
>
> Thanks
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From lists at cheimes.de  Tue May 12 08:25:08 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 12 May 2009 14:25:08 +0200
Subject: Python API Functions equivalent to  ruby's  rb_big2str() and
	rb_str2cstr()
In-Reply-To: <1553614d-4485-4b46-a779-08b4040071f8@d38g2000prn.googlegroups.com>
References: <1553614d-4485-4b46-a779-08b4040071f8@d38g2000prn.googlegroups.com>
Message-ID: <gubpr3$556$1@ger.gmane.org>

rahul schrieb:
> Is functions equivalent to ruby's  rb_big2str() and rb_str2cstr()
> available in Python.
> I had search a lot in google but not able to find that.
> If anybody know than please give me the name of those functions of
> Python.

Please don't assume that we know what the Ruby functions are doing. You
need to explain them or at least provide a link to some docs.

Christian



From bearophileHUGS at lycos.com  Tue May 12 08:27:58 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 12 May 2009 05:27:58 -0700 (PDT)
Subject: putting date strings in order
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>
	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
Message-ID: <735da351-b729-4949-b3ad-46d9b3206772@g20g2000vba.googlegroups.com>

noydb:

> I have not worked with the %.
> Can you provide a snippet of your idea in code form?

Then it's a very good moment to learn using it:
http://en.wikipedia.org/wiki/Modulo_operator

>>> 10 % 3
1
>>> 10 % 20
10
>>> -10 % 3
2
>>> -10 % -3
-1


>Something like that....<

Implement your first version, run it, and show us its output. Then I/
we can try to give you suggestions to improve your code.


>existing code???<

Sometimes you have to write code... that's life.

Bye,
bearophile


From jaime.frio at gmail.com  Tue May 12 08:38:57 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Tue, 12 May 2009 14:38:57 +0200
Subject: putting date strings in order
In-Reply-To: <d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>
	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
Message-ID: <97a8f1a70905120538p10b5a846j75a40a25724ad399@mail.gmail.com>

If you simply want to generate an ordered list of months, start with
it in order:

    dates = ["x_jan",...,"x_dec"]

and if the desired starting month is

    start = 6 # i.e. x_jun

    dates = dates[start - 1:] + dates[:start - 1]

If you have to sort the list itself, I would use an intermediate
dictionary to hold the positions, as in:

    months = {"x_jan" : 1, ..., "x_dec" : 12}

You can then sort the list with :

    dates.sort(None,lambda x : months[x])

and then do the

    dates = dates[start - 1:] + dates[:start - 1]

or alternatively you can get the sorting directly as you want it with:

    dates.sort(None,lambda x : (months[x] - start + 1) % 12)


Jaime



On Tue, May 12, 2009 at 1:58 PM, noydb <jenn.duerr at gmail.com> wrote:
> On May 11, 11:30?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>> noydb <jenn.du... at gmail.com> writes:
>> > Anyone have any good ideas? ?I was curious to see what people came up
>> > with.
>>
>> Is this a homework assignment? ?Some hints:
>>
>> 1) figure out how to compare two month names for chronological order,
>> ? ?leaving out the issue of the starting month not being january.
>> 2) figure out how to adjust for the starting month. ?The exact
>> ? ?semantics of the "%" operator might help do this concisely.
>
> Ha! ?No, this is not a homework assignment. ?I just find myself to be
> not the most eloquent and efficient scripter and wanted to see how
> others would approach it.
>
> I'm not sure how I follow your suggestion. ?I have not worked with the
> %. ?Can you provide a snippet of your idea in code form?
>
> I thought about assigning a number string (like 'x_1') to any string
> containing 'jan' -- so x_jan would become x_1, and so on. ?Then I
> could loop through with a counter on the position of the number (which
> is something i will need to do, comparing one month to the next
> chronological month, then that next month to its next month, and so
> on). ?And as for the starting postion, the user could declare, ie, aug
> the start month. ?aug is position 8. ?therefore subtract 7 from each
> value, thus aug becomes 1.... but then I guess early months would have
> to be add 5, such that july would become 12. ?Ugh, seems sloppy to me.
>
> Something like that.... ? seems poor to me. ?Anybody have a bteer
> idea, existing code???
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From sasurve at gmail.com  Tue May 12 08:49:38 2009
From: sasurve at gmail.com (shruti surve)
Date: Tue, 12 May 2009 18:19:38 +0530
Subject: About progress bar in glade
Message-ID: <862e00220905120549y19e4dce7l525efe9018d686ea@mail.gmail.com>

hi

i am using progress bar in glade and python file. When i clicked on menu
item, open office spreadsheet will be opened. but it takes some time to open
up, so i want to add progress bar. Now, when i clicked on menu item,dialog
with progress bar is coming and progress bar is pulsating but xml_rpc calls
running at back end stopped working. Once i close the dialog box,rpc start
working. But both should work simultaneously. What should i do for this??


regards

shruti
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From sasurve at gmail.com  Tue May 12 08:51:55 2009
From: sasurve at gmail.com (shruti surve)
Date: Tue, 12 May 2009 18:21:55 +0530
Subject: multithreading in python
Message-ID: <862e00220905120551r1a7c8a7xf708e4758d086bd3@mail.gmail.com>

hi,
 how to do multithreading in python??? Like running dialog box and running
xml rpc calls simultaneously???


regards
shruti
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From google at mrabarnett.plus.com  Tue May 12 08:53:50 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 12 May 2009 13:53:50 +0100
Subject: putting date strings in order
In-Reply-To: <d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
Message-ID: <4A09715E.8040908@mrabarnett.plus.com>

noydb wrote:
> On May 11, 11:30 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>> noydb <jenn.du... at gmail.com> writes:
>>> Anyone have any good ideas?  I was curious to see what people came up
>>> with.
>> Is this a homework assignment?  Some hints:
>>
>> 1) figure out how to compare two month names for chronological order,
>>    leaving out the issue of the starting month not being january.
>> 2) figure out how to adjust for the starting month.  The exact
>>    semantics of the "%" operator might help do this concisely.
> 
> Ha!  No, this is not a homework assignment.  I just find myself to be
> not the most eloquent and efficient scripter and wanted to see how
> others would approach it.
> 
> I'm not sure how I follow your suggestion.  I have not worked with the
> %.  Can you provide a snippet of your idea in code form?
> 
> I thought about assigning a number string (like 'x_1') to any string
> containing 'jan' -- so x_jan would become x_1, and so on.  Then I
> could loop through with a counter on the position of the number (which
> is something i will need to do, comparing one month to the next
> chronological month, then that next month to its next month, and so
> on).  And as for the starting postion, the user could declare, ie, aug
> the start month.  aug is position 8.  therefore subtract 7 from each
> value, thus aug becomes 1.... but then I guess early months would have
> to be add 5, such that july would become 12.  Ugh, seems sloppy to me.
> 
> Something like that....   seems poor to me.  Anybody have a bteer
> idea, existing code???

Sort the list, passing a function as the 'key' argument. The function
should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
you want to have a different start month then add the appropriate
integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
to make it wrap around (there are only 12 months in a year), returning
the result.


From rahul03535 at gmail.com  Tue May 12 09:01:24 2009
From: rahul03535 at gmail.com (rahul)
Date: Tue, 12 May 2009 06:01:24 -0700 (PDT)
Subject: Python API Functions equivalent to ruby's rb_big2str() and 
	rb_str2cstr()
References: <1553614d-4485-4b46-a779-08b4040071f8@d38g2000prn.googlegroups.com>
	<mailman.39.1242131126.8015.python-list@python.org>
Message-ID: <d563c582-259d-43be-bf07-04ac6ccbcf21@k9g2000pra.googlegroups.com>

On May 12, 5:25?pm, Christian Heimes <li... at cheimes.de> wrote:
> rahul schrieb:
>
> > Is functions equivalent to ruby's ?rb_big2str() and rb_str2cstr()
> > available in Python.
> > I had search a lot in google but not able to find that.
> > If anybody know than please give me the name of those functions of
> > Python.
>
> Please don't assume that we know what the Ruby functions are doing. You
> need to explain them or at least provide a link to some docs.
>
> Christian

Hi Christian,
  rb_big2str(Big-Integer, base) of ruby returns string representation
of big-Integer. now, i am able to find equivalent python API function
of rb_str2cstr() of ruby.
so , please help me about rb_big2str(Big-Integer, base) equivalent of
Python API function which i can use in extended module in c.

---
 rahul

---
rahul


From almar.klein at gmail.com  Tue May 12 09:06:20 2009
From: almar.klein at gmail.com (Almar Klein)
Date: Tue, 12 May 2009 15:06:20 +0200
Subject: multithreading in python
In-Reply-To: <862e00220905120551r1a7c8a7xf708e4758d086bd3@mail.gmail.com>
References: <862e00220905120551r1a7c8a7xf708e4758d086bd3@mail.gmail.com>
Message-ID: <cc38d75f0905120606g4bd774bbj831e6df67f4f264c@mail.gmail.com>

See the standard help on the threading and thread module.

Almar

2009/5/12 shruti surve <sasurve at gmail.com>:
> hi,
> ?how to do multithreading in python??? Like running dialog box and running
> xml rpc calls simultaneously???
>
>
> regards
> shruti
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From rumpf_a at web.de  Tue May 12 09:10:02 2009
From: rumpf_a at web.de (rumpf_a at web.de)
Date: Tue, 12 May 2009 06:10:02 -0700 (PDT)
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.29.1242119171.8015.python-list@python.org>
Message-ID: <043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>

> There are two showstoppers for me though:
>
> 1. Introducing a new programming language where the char type is a
> byte is anachronistic. You're saying that programmers don't have to
> care about the string encoding and can just treat them as an array of
> bytes. That is exactly what causes all the problems with applications
> that haven't been designed to handle anything but ASCII. If you're
> doing any logic with strings except dumb reading and writing, you
> typically *have to* know the encoding. Forcing programmers to be aware
> of this problem is a good idea IMO.
>
> You can certainly have a string type that uses byte arrays in UTF-8
> encoding internally, but your string functions should be aware of that
> and treat it as a unicode string. The len function and index operators
> should count characters, not bytes. Add a byte array data type for
> byte arrays instead.
>
It's not easy. I think Python3's byte arrays have an "upper" method
(and a string literal syntax b"abc") which is quite alarming to me
that they chose the wrong default.

Eventually the "rope" data structure (that the compiler uses heavily)
will become a proper part of the library: By "rope" I mean an
immutable string implemented as a tree, so concatenation is O(1). For
immutable strings there is no ``[]=`` operation, so using UTF-8 and
converting it to a 32bit char works better.

> 2. The dynamic dispatch is messy. I agree that procedural is often
> simpler and more efficient than object-oriented programming, but
> object-oriented programming is useful just as often and should be made
> a simple as possible. Since Nimrod seems flexible, perhaps it would be
> possible to implement an object-orientation layer in Nimrod that hides
> the dynamic dispatch complexity?
>
Yes, I already have an idea how to improve it.


From davea at ieee.org  Tue May 12 09:19:31 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 12 May 2009 09:19:31 -0400
Subject: Is there a GUI for informing a user of missing dependencies?
In-Reply-To: <c84cea25-7c9f-40c8-aed3-5fe0d2e3a181@d19g2000prh.googlegroups.com>
References: <c84cea25-7c9f-40c8-aed3-5fe0d2e3a181@d19g2000prh.googlegroups.com>
Message-ID: <4A097763.1090209@ieee.org>



Jason wrote:
> I'm writing a small GUI (Python 2.5/6) using wxPython and pySerial.
> Since these are both 3rd party modules, if a user doesn't have them
> installed and tries to run the GUI from a file browser, the app will
> fail silently. I'm hoping to avoid that.
>
> Sure, I'll have a readme file, but I was wondering if there is an even
> more direct way. I was going to roll my own (eg. very simple Tkinter
> fallback error dialog if wxPython import fails, wxPython error dialog
> if anything else is missing); but I was wondering if such a system
> already exists out there.
>
> ? Jason
>
>   
One approach is something like:

import subprocess

errorstring = "echo XXX error occurred in my code. type 'exit' to close 
this shell window "
parms = ["cmd.exe", "/k"]
parms.append( errorstring )
subprocess.call(parms)

Any message can be built as long as it fits on one "line". And if more 
is needed, a batch file can be run instead of just "echo" at the 
beginning of the errorstring.

The user gets a command shell that he can then use to investigate 
various things, such as environment variables. And the shell goes away 
when he types the command "exit". The python program doesn't terminate 
till the user does so.

This is Windows specific, so certainly your Tkinter approach is more 
general. On the other hand, the user might have a subset of the standard 
Python installed, and Tkinter might have been deleted from his system.

If it has to work on older Python versions, you might go with 
os.system() or other similar things.



From ganesh.gbg at gmail.com  Tue May 12 09:21:10 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Tue, 12 May 2009 06:21:10 -0700 (PDT)
Subject: AssertionError - help me to solve this in a programme with Queue
Message-ID: <354106db-c900-48f4-a83f-5fa9482ecddb@x29g2000prf.googlegroups.com>

Hi all,
I'm just learning python ,the code below is found in one of the
sites ,it produces an error like
Traceback (most recent call last):
  File "queue.py", line 34, in <module>
    main()
  File "queue.py", line 28, in main
    t=MyThread(q)
  File "/usr/lib/python2.5/threading.py", line 398, in __init__
    assert group is None, "group argument must be None for now"
AssertionError: group argument must be None for now

can any one help me to find the reason

the code I wrote is


hosts =["http://yahoo.com", "http://google.com"]

# create a queue class
q=Queue.Queue()

#Thread class
class MyThread(threading.Thread):
	# define __int__ method acting like constructor
	def __int__(self,q):
		threading.Thread.__init__(self)
		self.q=q
	def run(self):
		h=self.q.get()
		opens=urllib2.urlopen(h)
		print opens.read(100)

		# signal the queue to say job is done
		self.q.task_done()
a=time.time()
def main():
	# create a pool of thread
	for i in range(5):
		t=MyThread(q)
		t.setDaemon(True)
		t.start()
	for h in hosts:
		queue.put(h)
	q.join()
main()
print "Time elasped : %s "%(time.time()-a)


The problem may be silly ,hence I'm every new to python i need your
guidance .




From sjmachin at lexicon.net  Tue May 12 09:27:21 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 12 May 2009 13:27:21 +0000 (UTC)
Subject: putting date strings in order
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
	<4A09715E.8040908@mrabarnett.plus.com>
Message-ID: <loom.20090512T132528-778@post.gmane.org>

MRAB <google <at> mrabarnett.plus.com> writes:
> 
> Sort the list, passing a function as the 'key' argument. The function
> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
> you want to have a different start month then add

and if you don't like what that produces, try subtract :-)

> the appropriate
> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
> to make it wrap around (there are only 12 months in a year), returning
> the result.

HTH,
John




From rumpf_a at web.de  Tue May 12 09:27:32 2009
From: rumpf_a at web.de (rumpf_a at web.de)
Date: Tue, 12 May 2009 06:27:32 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
	<4519cc9d-f765-4f55-81b2-58abfa20b988@p4g2000vba.googlegroups.com>
Message-ID: <49c224c0-1f58-4ff9-965c-a12f0aa26276@m24g2000vbp.googlegroups.com>

> > > The language and library are missing arbitrary precision integer
> > > arithmetic, using GMP or something like that.
>
> > True, but currently not a high priority for me.
>
> Too bad. That makes Nimrod officially "worthless", i.e., of no
> value to me.
>
Well, you could write a wrapper for GMP (and contribute to the
project ;-)).


From davea at ieee.org  Tue May 12 09:33:53 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 12 May 2009 09:33:53 -0400
Subject: how to write loop (was "no subject")
In-Reply-To: <452312.52363.qm@web45506.mail.sp1.yahoo.com>
References: <452312.52363.qm@web45506.mail.sp1.yahoo.com>
Message-ID: <4A097AC1.9080003@ieee.org>

karlos barlos wrote:
> hello to all 
>
> i have been using this script to add users to my active directory structure
>
> i wise to make a loop in order for it to run for A large Number of Users 
>
> can anyone give me some advice on the loop ??
>
>
>
> import win32com,win32com.client
> def add_acct(location,account):
>     
>   ad_obj=win32com.client.GetObject(location)
>   ad_user=ad_obj.Create('user','cn='+user['login'])
>   ad_user.Put('sAMAccountName',user['login'])
>   ad_user.Put('userPrincipalName',user['login']+'@email.address.com')
>   ad_user.Put('DisplayName',user['last']+' '+user['first']) #fullname
>   ad_user.Put('givenName',user['first'])
>   ad_user.Put('sn',user['last'])
>   ad_user.Put('description','regular account')
>   ad_user.Put('physicalDeliveryOfficeName','office 1')
>   ad_user.Put('HomeDirectory',r'\\server1\ '[:-1]+user['login']) 
>   ad_user.Put('HomeDrive','H:')
>   ad_user.SetInfo();ad_user.GetInfo()
>   ad_user.LoginScript='login.bat'
>   ad_user.AccountDisabled=0
>   ad_user.setpassword('the password')
>   ad_user.Put('pwdLastSet',0) #-- force reset of password
>   ad_user.SetInfo()
>
>
> location='LDAP://OU=sales,DC=shay,DC=com'
> user={'first':'shay','last':'smith','login':'shay123'}
> add_acct(location,user)
>
>
> location='LDAP://OU=sales,DC=shay,DC=com'
> user={'first':'ron','last':'smith','login':'ron1267'}
> add_acct(location,user)
>
>
>
>   
Your formal parameter "account" needs to be "user" to match the references.

What could be a loop?  You have two users added at the bottom which 
could be done as a loop, but only if you have some structure to loop 
over.  So before you make it a loop, you have to decide what that 
structure is, and whether creating it is more work than just continuing 
with your present model of an unrolled loop.

Examples of structures might be:
    a list of user information.  But building that list would be as much 
work as you have now.
    a text file.  Good idea.  It might be populated with Excel, or any 
other program that can produce a csv file, or a formatted text file.  Or 
it might be populated with a text editor, with verification.
    an interactive session.  The user types in the information one user 
at  a time, into a form.  You just loop through, presenting the form, 
and processing the information entered.
     an existing user database.  This might be  a loop that transfers 
information from one format to another.

Decide the structure, and you can readily write the loop.

>       
>   


From google at mrabarnett.plus.com  Tue May 12 09:34:29 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 12 May 2009 14:34:29 +0100
Subject: AssertionError - help me to solve this in a programme with Queue
In-Reply-To: <354106db-c900-48f4-a83f-5fa9482ecddb@x29g2000prf.googlegroups.com>
References: <354106db-c900-48f4-a83f-5fa9482ecddb@x29g2000prf.googlegroups.com>
Message-ID: <4A097AE5.5030702@mrabarnett.plus.com>

gganesh wrote:
> Hi all,
> I'm just learning python ,the code below is found in one of the
> sites ,it produces an error like
> Traceback (most recent call last):
>   File "queue.py", line 34, in <module>
>     main()
>   File "queue.py", line 28, in main
>     t=MyThread(q)
>   File "/usr/lib/python2.5/threading.py", line 398, in __init__
>     assert group is None, "group argument must be None for now"
> AssertionError: group argument must be None for now
> 
> can any one help me to find the reason
> 
> the code I wrote is
> 
> 
> hosts =["http://yahoo.com", "http://google.com"]
> 
> # create a queue class
> q=Queue.Queue()
> 
> #Thread class
> class MyThread(threading.Thread):
> 	# define __int__ method acting like constructor
> 	def __int__(self,q):
               ^^^
               Should be __init__.

> 		threading.Thread.__init__(self)
> 		self.q=q
> 	def run(self):
> 		h=self.q.get()
> 		opens=urllib2.urlopen(h)
> 		print opens.read(100)
> 
> 		# signal the queue to say job is done
> 		self.q.task_done()
> a=time.time()
> def main():
> 	# create a pool of thread
> 	for i in range(5):
> 		t=MyThread(q)
> 		t.setDaemon(True)
> 		t.start()
> 	for h in hosts:
> 		queue.put(h)
> 	q.join()
> main()
> print "Time elasped : %s "%(time.time()-a)
> 
> 
> The problem may be silly ,hence I'm every new to python i need your
> guidance .
> 
> 



From sasurve at gmail.com  Tue May 12 09:38:32 2009
From: sasurve at gmail.com (shruti surve)
Date: Tue, 12 May 2009 19:08:32 +0530
Subject: About progress bar in glade
In-Reply-To: <862e00220905120549y19e4dce7l525efe9018d686ea@mail.gmail.com>
References: <862e00220905120549y19e4dce7l525efe9018d686ea@mail.gmail.com>
Message-ID: <862e00220905120638t532d7215l1b26205956b5fa9c@mail.gmail.com>

On Tue, May 12, 2009 at 6:19 PM, shruti surve <sasurve at gmail.com> wrote:

> hi
>
> i am using progress bar in glade and python file. When i clicked on menu
> item, open office spreadsheet will be opened. but it takes some time to open
> up, so i want to add progress bar. Now, when i clicked on menu item,dialog
> with progress bar is coming and progress bar is pulsating but other
> processes at front end  stopped working. So,its  blocking all other
> processes. But both should work simultaneously. What should i do for this??
>
>
> regards
>
> shruti
>
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From hniksic at xemacs.org  Tue May 12 09:48:52 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Tue, 12 May 2009 15:48:52 +0200
Subject: Python API Functions equivalent to ruby's rb_big2str() and
	rb_str2cstr()
References: <1553614d-4485-4b46-a779-08b4040071f8@d38g2000prn.googlegroups.com>
	<mailman.39.1242131126.8015.python-list@python.org>
	<d563c582-259d-43be-bf07-04ac6ccbcf21@k9g2000pra.googlegroups.com>
Message-ID: <877i0mph2z.fsf@busola.homelinux.net>

rahul <rahul03535 at gmail.com> writes:

> Hi Christian,
>   rb_big2str(Big-Integer, base) of ruby returns string representation
> of big-Integer. now, i am able to find equivalent python API function
> of rb_str2cstr() of ruby.

That would be PyLong_FromString, for the sake of later searches.

> so , please help me about rb_big2str(Big-Integer, base) equivalent of
> Python API function which i can use in extended module in c.

You can use PyObject_Str(long_object) to convert long to string.  No
special function is needed.


From rumpf_a at web.de  Tue May 12 09:49:36 2009
From: rumpf_a at web.de (rumpf_a at web.de)
Date: Tue, 12 May 2009 06:49:36 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
	<7x4ovrkxu1.fsf@ruckus.brouhaha.com>
Message-ID: <fb1691d2-c251-4fb1-a7e5-3b22463402b4@p4g2000vba.googlegroups.com>

> > That is already the case: The Pascal version is translated to Nimrod
> > and than compiles itself. Bootstrapping works.
>
> I meant why not get rid of the translation step and implement the
> compiler in idiomatic Nimrod.
>
Not until version 1.0 is out. This way the language can evolve more
easily.

> > The plan is to use LLVM as a backend and perhaps
> >http://tinystm.org/. Of course, this is only wishful thinking. ;-)
>
> Oh cool, I didn't know about tinystm. ?But, my question about
> mutability is how you protect STM transactions when other threads can
> have references into shared mutable structures and clobber the
> referents. ?GHC uses its type system to prevent that, but I don't see
> how Nimrod can really do the same, especially without GHC's rich set
> of immutable types including stuff like immutable maps.
>
Well STM transactions in an imperative context are still being
actively researched. Sorry I have no better answer.

> Have you ever looked at Tim Sweeney's presentation "The Next
> Mainstream Programming Language"?
Yes. It's awsome. But the next mainstream programming language also
needs a massive amount of money to take off, so I don't think it will
be Nimrod. :-)


From ganesh.gbg at gmail.com  Tue May 12 09:51:22 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Tue, 12 May 2009 06:51:22 -0700 (PDT)
Subject: AssertionError - help me to solve this in a programme with Queue
References: <354106db-c900-48f4-a83f-5fa9482ecddb@x29g2000prf.googlegroups.com>
	<mailman.49.1242135267.8015.python-list@python.org>
Message-ID: <cb7ee449-7102-4501-a28b-71c7eebd3b70@n7g2000prc.googlegroups.com>

On May 12, 6:34?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> gganesh wrote:
> > Hi all,
> > I'm just learning python ,the code below is found in one of the
> > sites ,it produces an error like
> > Traceback (most recent call last):
> > ? File "queue.py", line 34, in <module>
> > ? ? main()
> > ? File "queue.py", line 28, in main
> > ? ? t=MyThread(q)
> > ? File "/usr/lib/python2.5/threading.py", line 398, in __init__
> > ? ? assert group is None, "group argument must be None for now"
> > AssertionError: group argument must be None for now
>
> > can any one help me to find the reason
>
> > the code I wrote is
>
> > hosts =["http://yahoo.com", "http://google.com"]
>
> > # create a queue class
> > q=Queue.Queue()
>
> > #Thread class
> > class MyThread(threading.Thread):
> > ? ?# define __int__ method acting like constructor
> > ? ?def __int__(self,q):
>
> ? ? ? ? ? ? ? ?^^^
> ? ? ? ? ? ? ? ?Should be __init__.
>
> > ? ? ? ? ? ?threading.Thread.__init__(self)
> > ? ? ? ? ? ?self.q=q
> > ? ?def run(self):
> > ? ? ? ? ? ?h=self.q.get()
> > ? ? ? ? ? ?opens=urllib2.urlopen(h)
> > ? ? ? ? ? ?print opens.read(100)
>
> > ? ? ? ? ? ?# signal the queue to say job is done
> > ? ? ? ? ? ?self.q.task_done()
> > a=time.time()
> > def main():
> > ? ?# create a pool of thread
> > ? ?for i in range(5):
> > ? ? ? ? ? ?t=MyThread(q)
> > ? ? ? ? ? ?t.setDaemon(True)
> > ? ? ? ? ? ?t.start()
> > ? ?for h in hosts:
> > ? ? ? ? ? ?queue.put(h)
> > ? ?q.join()
> > main()
> > print "Time elasped : %s "%(time.time()-a)
>
> > The problem may be silly ,hence I'm every new to python i need your
> > guidance .
>
>

hi
It did work that way

File "queue.py", line 15
    threading.Thread__init__.(self)
                             ^
SyntaxError: invalid syntax




From deets at nospam.web.de  Tue May 12 10:11:42 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 12 May 2009 16:11:42 +0200
Subject: AssertionError - help me to solve this in a programme with Queue
References: <354106db-c900-48f4-a83f-5fa9482ecddb@x29g2000prf.googlegroups.com>
	<mailman.49.1242135267.8015.python-list@python.org>
	<cb7ee449-7102-4501-a28b-71c7eebd3b70@n7g2000prc.googlegroups.com>
Message-ID: <76te9iF1ejgblU1@mid.uni-berlin.de>

gganesh wrote:

> On May 12, 6:34?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>> gganesh wrote:
>> > Hi all,
>> > I'm just learning python ,the code below is found in one of the
>> > sites ,it produces an error like
>> > Traceback (most recent call last):
>> > File "queue.py", line 34, in <module>
>> > main()
>> > File "queue.py", line 28, in main
>> > t=MyThread(q)
>> > File "/usr/lib/python2.5/threading.py", line 398, in __init__
>> > assert group is None, "group argument must be None for now"
>> > AssertionError: group argument must be None for now
>>
>> > can any one help me to find the reason
>>
>> > the code I wrote is
>>
>> > hosts =["http://yahoo.com", "http://google.com"]
>>
>> > # create a queue class
>> > q=Queue.Queue()
>>
>> > #Thread class
>> > class MyThread(threading.Thread):
>> > # define __int__ method acting like constructor
>> > def __int__(self,q):
>>
>> ^^^
>> Should be __init__.
>>
>> > threading.Thread.__init__(self)
>> > self.q=q
>> > def run(self):
>> > h=self.q.get()
>> > opens=urllib2.urlopen(h)
>> > print opens.read(100)
>>
>> > # signal the queue to say job is done
>> > self.q.task_done()
>> > a=time.time()
>> > def main():
>> > # create a pool of thread
>> > for i in range(5):
>> > t=MyThread(q)
>> > t.setDaemon(True)
>> > t.start()
>> > for h in hosts:
>> > queue.put(h)
>> > q.join()
>> > main()
>> > print "Time elasped : %s "%(time.time()-a)
>>
>> > The problem may be silly ,hence I'm every new to python i need your
>> > guidance .
>>
>>
> 
> hi
> It did work that way
> 
> File "queue.py", line 15
>     threading.Thread__init__.(self)
>                              ^
> SyntaxError: invalid syntax

Because you messed up the .

threading.THread.__init__(self)

Please spend at least a couple of hours with the tutorial.

Diez


From philippovmi at gmail.com  Tue May 12 10:13:54 2009
From: philippovmi at gmail.com (maxim)
Date: Tue, 12 May 2009 07:13:54 -0700 (PDT)
Subject: AssertionError - help me to solve this in a programme with Queue
References: <354106db-c900-48f4-a83f-5fa9482ecddb@x29g2000prf.googlegroups.com>
	<mailman.49.1242135267.8015.python-list@python.org>
	<cb7ee449-7102-4501-a28b-71c7eebd3b70@n7g2000prc.googlegroups.com>
Message-ID: <bb4125cb-8b2f-4d4c-b6fa-738280f61260@z7g2000vbh.googlegroups.com>


> hi
> It did work that way
>
> File "queue.py", line 15
> ? ? threading.Thread__init__.(self)
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?^
> SyntaxError: invalid syntax

You've wrote right first time "threading.Thread.__init__(slef)", but
misprinted in your code "def _int_(self,q)" instead of "def __init__
(self,q)".


From google at mrabarnett.plus.com  Tue May 12 11:02:31 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 12 May 2009 16:02:31 +0100
Subject: putting date strings in order
In-Reply-To: <loom.20090512T132528-778@post.gmane.org>
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>	<7x8wl3c81i.fsf@ruckus.brouhaha.com>	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>	<4A09715E.8040908@mrabarnett.plus.com>
	<loom.20090512T132528-778@post.gmane.org>
Message-ID: <4A098F87.5060105@mrabarnett.plus.com>

John Machin wrote:
> MRAB <google <at> mrabarnett.plus.com> writes:
>> Sort the list, passing a function as the 'key' argument. The function
>> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
>> you want to have a different start month then add
> 
> and if you don't like what that produces, try subtract :-)
> 
Oops!

>> the appropriate
>> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
>> to make it wrap around (there are only 12 months in a year), returning
>> the result.
> 
Actually, subtract the start month, add 12, and then modulo 12.


From ppearson at nowhere.invalid  Tue May 12 11:45:09 2009
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 12 May 2009 15:45:09 GMT
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz>
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
	<pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <76tjs5F1ep1qiU1@mid.individual.net>

On 12 May 2009 09:35:36 GMT, Steven D'Aprano wrote:
[snip]
> To really be safe, that should become:
>
> try:
>     rsrc = get(resource)
> except ResourceError:
>     log('no more resources available')
>     raise
> else:
>     try:
>         do_something_with(rsrc)
>     finally:
>         rsrc.close()

Thanks, Steven.  I find these examples illuminating.

Not trying to be dense, but given that the "except" block
re-raises the exception, isn't the above the same as . . .?

try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available')
    raise
try:
    do_something_with(rsrc)
finally:
    rsrc.close()

-- 
To email me, substitute nowhere->spamcop, invalid->net.


From sjmachin at lexicon.net  Tue May 12 11:57:37 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 12 May 2009 08:57:37 -0700 (PDT)
Subject: putting date strings in order
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>
	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
	<4A09715E.8040908@mrabarnett.plus.com>
	<loom.20090512T132528-778@post.gmane.org> 
	<mailman.51.1242140548.8015.python-list@python.org>
Message-ID: <87ca16b5-2493-43fa-91f2-a04e545719b6@x29g2000prf.googlegroups.com>

On May 13, 1:02?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> John Machin wrote:
> > MRAB <google <at> mrabarnett.plus.com> writes:
> >> Sort the list, passing a function as the 'key' argument. The function
> >> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
> >> you want to have a different start month then add
>
> > and if you don't like what that produces, try subtract :-)
>
> Oops!
>
> >> the appropriate
> >> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
> >> to make it wrap around (there are only 12 months in a year), returning
> >> the result.
>
> Actually, subtract the start month, add 12, and then modulo 12.

Ummm ... 12 modulo 12 is a big fat zero, and Python's % is a genuine
modulo operator; unlike that of K&R C, it's defined not to go wobbly
on negatives.

| >>> [(i - 8 + 12) % 12 for i in range(12)]
| [4, 5, 6, 7, 8, 9, 10, 11, 0, 1, 2, 3]

| >>> [(i - 8     ) % 12 for i in range(12)]
| [4, 5, 6, 7, 8, 9, 10, 11, 0, 1, 2, 3]


From jaime.frio at gmail.com  Tue May 12 11:58:38 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Tue, 12 May 2009 17:58:38 +0200
Subject: putting date strings in order
In-Reply-To: <4A098F87.5060105@mrabarnett.plus.com>
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>
	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
	<4A09715E.8040908@mrabarnett.plus.com>
	<loom.20090512T132528-778@post.gmane.org>
	<4A098F87.5060105@mrabarnett.plus.com>
Message-ID: <97a8f1a70905120858o4f442d9cx4bb016ecff427ea0@mail.gmail.com>

On Tue, May 12, 2009 at 5:02 PM, MRAB <google at mrabarnett.plus.com> wrote:
> John Machin wrote:
>>
>> MRAB <google <at> mrabarnett.plus.com> writes:
>>>
>>> Sort the list, passing a function as the 'key' argument. The function
>>> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
>>> you want to have a different start month then add
>>
>> and if you don't like what that produces, try subtract :-)
>>
> Oops!
>
>>> the appropriate
>>> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
>>> to make it wrap around (there are only 12 months in a year), returning
>>> the result.
>>
> Actually, subtract the start month, add 12, and then modulo 12.

Both on my Linux and my Windows pythons, modulos of negative numbers
are properly taken, returning always the correct positive number
between 0 and 11. I seem to recall, from my distant past, that Perl
took pride on this being a language feature. Anyone knows if that is
not the case with python, and so not adding 12 before taking the
modulo could result in wrong results in some implementations?

> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From totobe at gmail.com  Tue May 12 11:59:29 2009
From: totobe at gmail.com (wdveloper)
Date: Tue, 12 May 2009 08:59:29 -0700 (PDT)
Subject: Call Web Service using proxy and http authentication
Message-ID: <3ebae673-2579-4589-b57a-2330c5fe9f3c@j12g2000vbl.googlegroups.com>

Hi everyone,

I am trying to call a webservice which requires an http
authentication.
To reach the ws, I must pass from a proxy http. So in the whole I need
go through two authentications before getting the ws working. I am
using SOAPpy and I'm getting quite crazy.
I am able to arrange this problem with simple http calls using urllib2
but for the ws i dont see any way out.

Does anyone knows how I can manage this stuff? Is there any better
solution or example code?

Thanks very much for your help,
totobe


From sjmachin at lexicon.net  Tue May 12 12:03:33 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 12 May 2009 09:03:33 -0700 (PDT)
Subject: Python API Functions equivalent to ruby's rb_big2str() and 
	rb_str2cstr()
References: <1553614d-4485-4b46-a779-08b4040071f8@d38g2000prn.googlegroups.com>
	<mailman.39.1242131126.8015.python-list@python.org>
	<d563c582-259d-43be-bf07-04ac6ccbcf21@k9g2000pra.googlegroups.com>
	<877i0mph2z.fsf@busola.homelinux.net>
Message-ID: <7c9961dd-3fa2-4b19-9dd4-dd3ab231d7f0@d7g2000prl.googlegroups.com>

On May 12, 11:48?pm, Hrvoje Niksic <hnik... at xemacs.org> wrote:
> rahul <rahul03... at gmail.com> writes:
> > Hi Christian,
> > ? rb_big2str(Big-Integer, base) of ruby returns string

*base*

>representation
> > of big-Integer. now, i am able to find equivalent python API function
> > of rb_str2cstr() of ruby.
>
> That would be PyLong_FromString, for the sake of later searches.
>
> > so , please help me about rb_big2str(Big-Integer, base)

*base*

> equivalent of
> > Python API function which i can use in extended module in c.
>
> You can use PyObject_Str(long_object) to convert long to string. ?No
> special function is needed.

ALL of your base are want to be convert by us -- not merely 10.



From google at mrabarnett.plus.com  Tue May 12 12:25:07 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 12 May 2009 17:25:07 +0100
Subject: putting date strings in order
In-Reply-To: <97a8f1a70905120858o4f442d9cx4bb016ecff427ea0@mail.gmail.com>
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>	
	<7x8wl3c81i.fsf@ruckus.brouhaha.com>	
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>	
	<4A09715E.8040908@mrabarnett.plus.com>	
	<loom.20090512T132528-778@post.gmane.org>	
	<4A098F87.5060105@mrabarnett.plus.com>
	<97a8f1a70905120858o4f442d9cx4bb016ecff427ea0@mail.gmail.com>
Message-ID: <4A09A2E3.7090206@mrabarnett.plus.com>

Jaime Fernandez del Rio wrote:
> On Tue, May 12, 2009 at 5:02 PM, MRAB <google at mrabarnett.plus.com> wrote:
>> John Machin wrote:
>>> MRAB <google <at> mrabarnett.plus.com> writes:
>>>> Sort the list, passing a function as the 'key' argument. The function
>>>> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
>>>> you want to have a different start month then add
>>> and if you don't like what that produces, try subtract :-)
>>>
>> Oops!
>>
>>>> the appropriate
>>>> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
>>>> to make it wrap around (there are only 12 months in a year), returning
>>>> the result.
>> Actually, subtract the start month, add 12, and then modulo 12.
> 
> Both on my Linux and my Windows pythons, modulos of negative numbers
> are properly taken, returning always the correct positive number
> between 0 and 11. I seem to recall, from my distant past, that Perl
> took pride on this being a language feature. Anyone knows if that is
> not the case with python, and so not adding 12 before taking the
> modulo could result in wrong results in some implementations?
> 
Ah, yes, it's a true modulo! Nice to see that Python gets it right! :-)


From sjmachin at lexicon.net  Tue May 12 12:26:27 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 12 May 2009 09:26:27 -0700 (PDT)
Subject: putting date strings in order
References: mailman.52.1242143921.8015.python-list@python.org
Message-ID: <a276bc1e-a800-4dbc-ac77-55923ccf36c8@f1g2000prb.googlegroups.com>

On May 13, 1:58?am, Jaime Fernandez del Rio <jaime.f... at gmail.com>
wrote:
> On Tue, May 12, 2009 at 5:02 PM, MRAB <goo... at mrabarnett.plus.com> wrote:
> > John Machin wrote:
>
> >> MRAB <google <at> mrabarnett.plus.com> writes:
>
> >>> Sort the list, passing a function as the 'key' argument. The function
> >>> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
> >>> you want to have a different start month then add
>
> >> and if you don't like what that produces, try subtract :-)
>
> > Oops!
>
> >>> the appropriate
> >>> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
> >>> to make it wrap around (there are only 12 months in a year), returning
> >>> the result.
>
> > Actually, subtract the start month, add 12, and then modulo 12.
>
> Both on my Linux and my Windows pythons, modulos of negative numbers
> are properly taken, returning always the correct positive number
> between 0 and 11. I seem to recall, from my distant past, that Perl
> took pride on this being a language feature. Anyone knows if that is
> not the case with python, and so not adding 12 before taking the
> modulo could result in wrong results in some implementations?

If that happens, it's a bug.
http://docs.python.org/reference/expressions.html#binary-arithmetic-operations

If you look at function i_divmod() in the 2.x branch's Objects/
intobject.c, you'll be reassured to see that it doesn't just take
whatever C serves up :-)


From norseman at hughes.net  Tue May 12 12:37:17 2009
From: norseman at hughes.net (norseman)
Date: Tue, 12 May 2009 09:37:17 -0700
Subject: piping input to an external script
In-Reply-To: <e301dce1-fe8c-4089-aa51-97a3ded310a7@n4g2000vba.googlegroups.com>
References: <gu9pbe$csc$1@foggy.unx.sas.com>	<mailman.21.1242105403.8015.python-list@python.org>
	<81e57098-b61e-4e8b-826c-833518c8115e@r3g2000vbp.googlegroups.com>
	<mailman.23.1242109891.8015.python-list@python.org>
	<e301dce1-fe8c-4089-aa51-97a3ded310a7@n4g2000vba.googlegroups.com>
Message-ID: <4A09A5BD.2060401@hughes.net>

Steve Howell wrote:
> On May 11, 11:31 pm, norseman <norse... at hughes.net> wrote:
>> Steve Howell wrote:
>>> On May 11, 10:16 pm, norseman <norse... at hughes.net> wrote:
>>>> Tim Arnold wrote:
>>>>> Hi, I have some html files that I want to validate by using an external
>>>>> script 'validate'. The html files need a doctype header attached before
>>>>> validation. The files are in utf8 encoding. My code:
>>>>> ---------------
>>>>> import os,sys
>>>>> import codecs,subprocess
>>>>> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
>>>>> filename  = 'mytest.html'
>>>>> fd = codecs.open(filename,'rb',encoding='utf8')
>>>>> s = HEADER + fd.read()
>>>>> fd.close()
>>>>> p = subprocess.Popen(['validate'],
>>>>>                     stdin=subprocess.PIPE,
>>>>>                     stdout=subprocess.PIPE,
>>>>>                     stderr=subprocess.STDOUT)
>>>>> validate = p.communicate(unicode(s,encoding='utf8'))
>>>>> print validate
>>>>> ---------------
>>>>> I get lots of lines like this:
>>>>> Error at line 1, character 66:\tillegal character number 0
>>>>> etc etc.
>>>>> But I can give the command in a terminal 'cat mytest.html | validate' and
>>>>> get reasonable output. My subprocess code must be wrong, but I could use
>>>>> some help to see what the problem is.
>>>>> python2.5.1, freebsd6
>>>>> thanks,
>>>>> --Tim
>>>> ============================
>>>> If you search through the recent Python-List for UTF-8 things you might
>>>> get the same understanding I have come to.
>>>> the problem is the use of python's 'print' subcommand or what ever it
>>>> is. It 'cooks' things and someone decided that it would only handle 1/2
>>>> of a byte (in the x'00 to x'7f' range) and ignore or send error messages
>>>> against anything else. I guess the person doing the deciding read the
>>>> part that says ASCII printables are in the 7 bit range and chose to
>>>> ignore the part about the rest of the byte being undefined. That is
>>>> undefined, not disallowed.  Means the high bit half can be used as
>>>> wanted since it isn't already taken. Nor did whoever it was take a look
>>>> around the computer world and realize the conflict that was going to be
>>>> generated by using only 1/2 of a byte in a 1byte+ world.
>>>> If you can modify your code to use read and write you can bypass print
>>>> and be OK.  Or just have python do the 'cat mytest.html | validate' for
>>>> you. (Apply a var for html and let python accomplish the the equivalent
>>>> of Unix's:
>>>>     for f in *.html; do cat $f | validate; done
>>>>                          or
>>>>      for f in *.html; do validate $f; done  #file name available this way
>>>> If you still have problems, take a look at os.POPEN2 (and its popen3)
>>>> Also take look at os.spawn.. et al
>>> Wow.  Unicode and subprocessing and printing can have dark corners,
>>> but common sense does apply in MOST situations.
>>> If you send the header, add the newline.
>>> But you do not need the header if you can cat the input file sans
>>> header and get sensible input.
>> Yep!  The problem is with 'print'
>>
> 
> Huh?  Print is printing exactly what you expect it to print.
> 
===============
My apologies.

Tim: Using what you posted;
Is the third char of the first line read from file a TAB?

Just curious.  len(HEADER) is 63, error at 66  char number 0, doesn't 
seem quite consistent math wise.
63 + cr + lf gives 65.  But, as another noted, you don't have those.
"...66:\tillegal..."  is '\t' a tab on screen or byte 1 or 3 of file?
If you have mc available, in it - highlight file and press Shift-F3 then 
F4.  09 is TAB

</title> is closing, should not exist as opener
<html>   can be opener, did the h somehow become a '\'
          (still - that would put x'09' at byte 2 of file)

Most validate programs I have used will let me know the header is 
missing if in fact it is and give me a choice of how to process (XML, 
XHTML, HTML 1.1, ...) or quit.

is HEADER ('<!DOC...>') itself already in utf-8?
Or are you mixing things?

Last but not least - if you have source of validate process, check that 
over carefully.  The numbers don't work for me.

Just thinking on paper. No need to respond.

Steve


From tim.arnold at sas.com  Tue May 12 12:46:47 2009
From: tim.arnold at sas.com (Tim Arnold)
Date: Tue, 12 May 2009 12:46:47 -0400
Subject: piping input to an external script
References: <gu9pbe$csc$1@foggy.unx.sas.com>
	<mailman.25.1242113076.8015.python-list@python.org>
Message-ID: <guc95n$efo$1@foggy.unx.sas.com>

"Dave Angel" <davea at ieee.org> wrote in message 
news:mailman.25.1242113076.8015.python-list at python.org...
> Tim Arnold wrote:
>> Hi, I have some html files that I want to validate by using an external 
>> script 'validate'. The html files need a doctype header attached before 
>> validation. The files are in utf8 encoding. My code:
>> ---------------
>> import os,sys
>> import codecs,subprocess
>> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 
>> Transitional//EN">'
>>
>> filename  = 'mytest.html'
>> fd = codecs.open(filename,'rb',encoding='utf8')
>> s = HEADER + fd.read()
>> fd.close()
>>
>> p = subprocess.Popen(['validate'],
>>                     stdin=subprocess.PIPE,
>>                     stdout=subprocess.PIPE,
>>                     stderr=subprocess.STDOUT)
>> validate = p.communicate(unicode(s,encoding='utf8'))
>> print validate
>> ---------------
>>
>> I get lots of lines like this:
>> Error at line 1, character 66:\tillegal character number 0
>> etc etc.
>>
>> But I can give the command in a terminal 'cat mytest.html | validate' and 
>> get reasonable output. My subprocess code must be wrong, but I could use 
>> some help to see what the problem is.
>>
>> python2.5.1, freebsd6
>> thanks,
>> --Tim
>>
>>
>>
>>
> The usual rule in debugging:  split the problem into two parts, and test 
> each one separately, starting with the one you think most likely to be the 
> culprit
>
> In this case the obvious place to split is with the data you're passing to 
> the  communicate call.  I expect it's already wrong, long before you hand 
> it to the subprocess.  So write it to a file instead, and inspect it with 
> a binary file viewer.  And of course test it manually with your validate 
> program.  Is validate really expecting a Unicode stream in stdin ?
>

Good advice from everyone. The example was simpler than my actual situation, 
but it did show the problem. Dave's final question was the right one: I 
needed to pass the html content as a string, not unicode object:

HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">\n'

filename  = 'mytest.html'
fd = codecs.open(filename,'rb',encoding='utf8')
s = HEADER + fd.read().encode('utf8') # <- made the difference
fd.close()

p = subprocess.Popen(['validate',],
                    stdin=subprocess.PIPE,
                    stdout=subprocess.PIPE,
                    stderr=subprocess.STDOUT)
validate = p.communicate(s)
print validate





From mensanator at aol.com  Tue May 12 12:49:38 2009
From: mensanator at aol.com (Mensanator)
Date: Tue, 12 May 2009 09:49:38 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
	<4519cc9d-f765-4f55-81b2-58abfa20b988@p4g2000vba.googlegroups.com> 
	<49c224c0-1f58-4ff9-965c-a12f0aa26276@m24g2000vbp.googlegroups.com>
Message-ID: <ebc2a31b-02b8-4671-95bb-29cac0e412c3@s21g2000vbb.googlegroups.com>

On May 12, 8:27?am, rump... at web.de wrote:
> > > > The language and library are missing arbitrary precision integer
> > > > arithmetic, using GMP or something like that.
>
> > > True, but currently not a high priority for me.
>
> > Too bad. That makes Nimrod officially "worthless", i.e., of no
> > value to me.
>
> Well, you could write a wrapper for GMP (and contribute to the
> project ;-)).

But such a thing already exists in Python. And I spend my time
USING arbitrary precision numbers to do math research.

Just thought you'ld like to be aware that some people actually
make their language choices based on the availability (and
performance)
of arbitrary precision numbers.


From norseman at hughes.net  Tue May 12 13:17:58 2009
From: norseman at hughes.net (norseman)
Date: Tue, 12 May 2009 10:17:58 -0700
Subject: No subject
In-Reply-To: <452312.52363.qm@web45506.mail.sp1.yahoo.com>
References: <452312.52363.qm@web45506.mail.sp1.yahoo.com>
Message-ID: <4A09AF46.4030405@hughes.net>

karlos barlos wrote:
> hello to all 
> 
> i have been using this script to add users to my active directory structure
> 
> i wise to make a loop in order for it to run for A large Number of Users 
> 
> can anyone give me some advice on the loop ??
> 
> 
> 
> import win32com,win32com.client
> def add_acct(location,account):
>     
>   ad_obj=win32com.client.GetObject(location)
>   ad_user=ad_obj.Create('user','cn='+user['login'])
>   ad_user.Put('sAMAccountName',user['login'])
>   ad_user.Put('userPrincipalName',user['login']+'@email.address.com')
>   ad_user.Put('DisplayName',user['last']+' '+user['first']) #fullname
>   ad_user.Put('givenName',user['first'])
>   ad_user.Put('sn',user['last'])
>   ad_user.Put('description','regular account')
>   ad_user.Put('physicalDeliveryOfficeName','office 1')
>   ad_user.Put('HomeDirectory',r'\\server1\ '[:-1]+user['login']) 
>   ad_user.Put('HomeDrive','H:')
>   ad_user.SetInfo();ad_user.GetInfo()
>   ad_user.LoginScript='login.bat'
>   ad_user.AccountDisabled=0
>   ad_user.setpassword('the password')
>   ad_user.Put('pwdLastSet',0) #-- force reset of password
>   ad_user.SetInfo()
> 
> 
> location='LDAP://OU=sales,DC=shay,DC=com'
> user={'first':'shay','last':'smith','login':'shay123'}
> add_acct(location,user)
> 
> 
> location='LDAP://OU=sales,DC=shay,DC=com'
                             DC=ron  yes?
> user={'first':'ron','last':'smith','login':'ron1267'}
> add_acct(location,user)
> 
> 
> 
> 
>       
> 
=======================================
.
.
def add_acct(location,account):
  OK



presumably you are reading from a list of names in a file
names= open(..)
Now you need a loop
for name in names:
   the location=  needs a variable in place of shay ('name' in this case)
   user=  this needs more explanation from you
          seems to be an attempt at alphabetizing
          if so:  presort the file with list of names
                or better yet
                  just read them in and sort entire list afterwards to
                  final file or python list (see python index)
   add name to listTemp
for user in list already existing:
   add user to listTemp
for user in list.Temp.index():
   copy to ListSorted
   reset first/last as needed
for user in ListSorted:
   store it someplace  (like your data file)


I suspect some of the add_.. function will need some mods, but maybe not
If 'shay123' is line number, track it in 'copy to ListSorted' section.
If the number is user id, assign it in source file.
(name id     1 pair per line, adjust read,etc to accommodate)

Today is: 20090512
no code this section

Steve


From showell30 at yahoo.com  Tue May 12 13:24:32 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 12 May 2009 10:24:32 -0700 (PDT)
Subject: piping input to an external script
References: <gu9pbe$csc$1@foggy.unx.sas.com>
Message-ID: <1f55d5bc-d9c9-4ed8-99e7-e0317b8e3047@v1g2000prd.googlegroups.com>

See suggested debugging tip inline of your program....

On May 11, 11:04?am, "Tim Arnold" <tim.arn... at sas.com> wrote:
> Hi, I have some html files that I want to validate by using an external
> script 'validate'. The html files need a doctype header attached before
> validation. The files are in utf8 encoding. My code:
> ---------------
> import os,sys
> import codecs,subprocess
> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
>
> filename ?= 'mytest.html'
> fd = codecs.open(filename,'rb',encoding='utf8')
> s = HEADER + fd.read()

# Try inserting lines like below, to see what characters are actually
near char 66.
print '---'
print repr(s[65])
print repr(s[66])
print repr(s[:70])
print repr(unicode(s,encoding='utf8')[:70])
print '---'

> fd.close()
>
> p = subprocess.Popen(['validate'],
> ? ? ? ? ? ? ? ? ? ? stdin=subprocess.PIPE,
> ? ? ? ? ? ? ? ? ? ? stdout=subprocess.PIPE,
> ? ? ? ? ? ? ? ? ? ? stderr=subprocess.STDOUT)
> validate = p.communicate(unicode(s,encoding='utf8'))
> print validate
> ---------------
>
> I get lots of lines like this:
> Error at line 1, character 66:\tillegal character number 0
> etc etc.
>

See above, it's pretty easy to see what the 66th character of "s" is.

> But I can give the command in a terminal 'cat mytest.html | validate' and
> get reasonable output. My subprocess code must be wrong, but I could use
> some help to see what the problem is.
>

Your disconnect is that in your program you are NOT actually
simulating the sending of mytest.html to the validate program, so you
are comparing apples and oranges.

The fact that you can send mytest.html to the validate program without
a header from the shell suggest to me that it is equally unnecessary
in your Python program, or maybe you just haven't thought through what
you're really trying to accomplish here.



From george.sakkis at gmail.com  Tue May 12 13:54:23 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Tue, 12 May 2009 10:54:23 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
	<4519cc9d-f765-4f55-81b2-58abfa20b988@p4g2000vba.googlegroups.com> 
	<49c224c0-1f58-4ff9-965c-a12f0aa26276@m24g2000vbp.googlegroups.com> 
	<ebc2a31b-02b8-4671-95bb-29cac0e412c3@s21g2000vbb.googlegroups.com>
Message-ID: <4bbb12e3-fe7f-40e9-aa24-1cc6c4175a8b@d19g2000prh.googlegroups.com>

On May 12, 12:49?pm, Mensanator <mensana... at aol.com> wrote:
> On May 12, 8:27?am, rump... at web.de wrote:
>
> > > > > The language and library are missing arbitrary precision integer
> > > > > arithmetic, using GMP or something like that.
>
> > > > True, but currently not a high priority for me.
>
> > > Too bad. That makes Nimrod officially "worthless", i.e., of no
> > > value to me.
>
> > Well, you could write a wrapper for GMP (and contribute to the
> > project ;-)).
>
> But such a thing already exists in Python. And I spend my time
> USING arbitrary precision numbers to do math research.
>
> Just thought you'ld like to be aware that some people actually
> make their language choices based on the availability (and
> performance)
> of arbitrary precision numbers.

I'm sure developers of a new language have to deal with much more
pressing issues before accommodating each and every self important
niche.


From namekuseijin at gmail.com  Tue May 12 13:54:59 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Tue, 12 May 2009 10:54:59 -0700 (PDT)
Subject: how to consume .NET webservice
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net> 
	<76rnq5F1dp6gpU1@mid.uni-berlin.de>
	<guaf4j$1fsn$1@adenine.netfront.net> 
	<76slqnF1ehacbU1@mid.uni-berlin.de>
Message-ID: <bb084afa-4a8a-4bf6-8786-35c6531d4ff8@j12g2000vbl.googlegroups.com>

On May 12, 4:12?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> namekuseijin schrieb:
> ?> Diez B. Roggisch wrote:
> ?>> namekuseijin schrieb:
> ?>>> bav escreveu:
> ?>>>> question from a python newbie;
> ?>>>>
> ?>>>> ? how can i consume in python language, a .NET web service, passing
> ?>>>> ? a string array as parameter in some easy steps?
> ?>>>
> ?>>> Unless Microsoft extended the standard in any way, then it should
> be just as you consume any web service, I guess. ;)
> ?>>
> ?>> Microsoft *created* the standard..
> ?>
> ?> No:
>
> Yes:
>
> http://webservices.xml.com/pub/a/ws/2001/04/04/soap.html

You are right, sorry.

> MS created it. That it *became* a standard of the W3C later - well, they
> did that with OOXML as well...

OpenOfficeXML document format AKA ODF? ;)


From kyosohma at gmail.com  Tue May 12 14:01:40 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 12 May 2009 11:01:40 -0700 (PDT)
Subject: how to consume .NET webservice
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net> 
	<76rnq5F1dp6gpU1@mid.uni-berlin.de>
	<guaf4j$1fsn$1@adenine.netfront.net> 
	<76slqnF1ehacbU1@mid.uni-berlin.de>
	<bb084afa-4a8a-4bf6-8786-35c6531d4ff8@j12g2000vbl.googlegroups.com>
Message-ID: <e857b604-12b5-4b44-a42d-11a65ceecb50@q14g2000vbn.googlegroups.com>

On May 12, 12:54?pm, namekuseijin <namekusei... at gmail.com> wrote:
> On May 12, 4:12?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
>
>
> > namekuseijin schrieb:
> > ?> Diez B. Roggisch wrote:
> > ?>> namekuseijin schrieb:
> > ?>>> bav escreveu:
> > ?>>>> question from a python newbie;
> > ?>>>>
> > ?>>>> ? how can i consume in python language, a .NET web service, passing
> > ?>>>> ? a string array as parameter in some easy steps?
> > ?>>>
> > ?>>> Unless Microsoft extended the standard in any way, then it should
> > be just as you consume any web service, I guess. ;)
> > ?>>
> > ?>> Microsoft *created* the standard..
> > ?>
> > ?> No:
>
> > Yes:
>
> >http://webservices.xml.com/pub/a/ws/2001/04/04/soap.html
>
> You are right, sorry.
>
> > MS created it. That it *became* a standard of the W3C later - well, they
> > did that with OOXML as well...
>
> OpenOfficeXML document format AKA ODF? ;)

No...Office Open XML, which is used in Microsoft Office 2007 and which
Microsoft rammed through the ISO: http://en.wikipedia.org/wiki/Office_Open_XML

- Mike


From mrstevegross at gmail.com  Tue May 12 14:33:02 2009
From: mrstevegross at gmail.com (mrstevegross)
Date: Tue, 12 May 2009 11:33:02 -0700 (PDT)
Subject: How to abort module evaluation?
Message-ID: <7c3885ec-41f3-469e-a5a6-7c7ebb5cc939@u10g2000vbd.googlegroups.com>

I have a python script that is pretty simple: when executed, it
imports a bunch of stuff and then runs some logic. When *imported*, it
defines some variables and exits. Here's what it looks like:

=== foo.py ===
if __name__ != '__main__':
  x = 1
  exit_somehow

import bar
do_some_stuff...
=== EOF ===

There's a problem, though. On line 3, I wrote "exit_somehow".
Actually, I have no idea how to do that part. Is there some way I can
get python to abandon processing the rest of the script at that point?
I know goto doesn't exist, so that's not an option... sys.exit() won't
work, because that will abort the entire python interpreter, rather
than just the evaluation of the module.

Thanks,
--Steve


From showell30 at yahoo.com  Tue May 12 14:38:02 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 12 May 2009 11:38:02 -0700 (PDT)
Subject: Call Web Service using proxy and http authentication
References: <3ebae673-2579-4589-b57a-2330c5fe9f3c@j12g2000vbl.googlegroups.com>
Message-ID: <f8e3d564-b19f-4767-b4cb-b7dfcb86ecca@j18g2000prm.googlegroups.com>

On May 12, 8:59?am, wdveloper <tot... at gmail.com> wrote:
> Hi everyone,
>
> I am trying to call a webservice which requires an http
> authentication.
> To reach the ws, I must pass from a proxy http. So in the whole I need
> go through two authentications before getting the ws working. I am
> using SOAPpy and I'm getting quite crazy.
> I am able to arrange this problem with simple http calls using urllib2
> but for the ws i dont see any way out.
>
> Does anyone knows how I can manage this stuff? Is there any better
> solution or example code?
>

Your high level description of the problem is good, but I think you'll
get more help if you provide a little more detail.

For something like this you may want to try to do more at the HTTP
level, where you have a little more control over the authentication,
and then find a way to hook into SOAPpy just to build and parse the
payloads.

How good is your understanding of HTTP?  Do you know the basics of how
headers work?  You might want to brush up a little on HTTP just to
help understand what's going on; it will almost certainly be valuable
for future projects as well.

To understand how the proxy works in particular, if you can use the
proxy to access a normal html-serving website, you can use the "Live
HTTP Headers" tool under Firefox to see what's going on.

But before all that, I would maybe just post a little more detail on
the problem.  Maybe show code you've written so far, and any error
messages/tracebacks, to better indicate where you are stuck.



From namekuseijin at gmail.com  Tue May 12 14:41:48 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Tue, 12 May 2009 11:41:48 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org>
Message-ID: <c3cd739e-d5e7-462f-8625-81809a7fafd3@o30g2000vbc.googlegroups.com>

On May 8, 12:48?pm, Andreas Rumpf <Rump... at web.de> wrote:
> Dear Python-users,
>
> I invented a new programming language called "Nimrod" that combines Python's readability with C's performance. Please check it out:http://force7.de/nimrod/
> Any feedback is appreciated.

heh, looks more like a streamlined Object Pascal (i.e class
declarations) than Python.  And indeed I see that it has a nice bridge
to old Object Pascal code.

OTOH, Python always felt to me very close to Pascal in the choice of
syntax keywords and readability.  Some people of late have been
comparing Python to Basic, but I guess that's only to widespread it
more among the american public, where Pascal as foreign tech never
quite grasped foot.


From piet at cs.uu.nl  Tue May 12 14:52:35 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Tue, 12 May 2009 20:52:35 +0200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
	<mailman.5400.1242000728.11746.python-list@python.org>
	<slrnh0fqu4.qcl.nick@irishsea.home.craig-wood.com>
	<gubl1l$nov$4@lust.ihug.co.nz>
Message-ID: <m2ws8mb1cc.fsf@cs.uu.nl>

>>>>> Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> (LD) wrote:

>LD> In message <slrnh0fqu4.qcl.nick at irishsea.home.craig-wood.com>, Nick Craig-
>LD> Wood wrote:

>>> Rhodri James <rhodri at wildebst.demon.co.uk> wrote:
>>> 
>>>> Emacs is my editor of choice ...
>>> 
>>> You probably haven't used MAC OS X then!

>LD> I tried using Emacs via SSH from a Mac once. Made me run screaming for the 
>LD> nearest Windows box 

The standard Windows box doesn't even have SSH AFAIK.

I edit remote files on my local Emacs on Mac OS X with tramp,
certainly when they are on a SSH-accessible machine.
Works like a charm.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From starsareblueandfaraway at gmail.com  Tue May 12 14:55:16 2009
From: starsareblueandfaraway at gmail.com (Roy Hyunjin Han)
Date: Tue, 12 May 2009 14:55:16 -0400
Subject: confused with subprocess.Popen
In-Reply-To: <f6a09c160905092237h336368c1od45eda6668d9b1e@mail.gmail.com>
References: <f6a09c160905080112x2620169fk9249e9469be607ea@mail.gmail.com>
	<4A064847.4080509@mattnordhoff.com>
	<f6a09c160905092237h336368c1od45eda6668d9b1e@mail.gmail.com>
Message-ID: <6a5569ec0905121155p7fb09cbfi2936cae0cc9374b0@mail.gmail.com>

There's a great article by Doug Hellmann on subprocess.
http://www.doughellmann.com/PyMOTW/subprocess/

On Sun, May 10, 2009 at 1:37 AM, Soumen banerjee <soumen08 at gmail.com> wrote:
> Thanks!, i have found that alternately setting shell=True also works
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From saddor at gmail.com  Tue May 12 15:05:41 2009
From: saddor at gmail.com (Cesar D. Rodas)
Date: Tue, 12 May 2009 15:05:41 -0400
Subject: Language detector using N-grams
Message-ID: <239036620905121205l2815c02cu48730dbaa1e66863@mail.gmail.com>

Hello Pythoners!

I just finished my first useful project in Python, It is a language
detector using N-grams. I hope this can be useful for someone,

http://github.com/crodas/py-languess/tree/master

The License of the project is BSD

Best regards

-- 
Cesar D. Rodas
http://cesar.la/
Phone: +595-961-974165
Jay Leno  - "Don't forget Mother's Day. Or as they call it in Beverly
Hills, Dad's Third Wife Day." -
http://www.brainyquote.com/quotes/authors/j/jay_leno.html


From nick at craig-wood.com  Tue May 12 15:30:04 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Tue, 12 May 2009 14:30:04 -0500
Subject: issue with twisted and reactor. Can't stop reactor
References: <20090511220919.21531.119723250.divmod.quotient.19655@henry.divmod.com>
	<mailman.11.1242082327.8015.python-list@python.org>
Message-ID: <slrnh0jgeu.ee.nick@irishsea.home.craig-wood.com>

Gabriel <gabriel at opensuse.org> wrote:
>  Jean-Paul Calderone escribi?:
>  > None of the reactors in Twisted are restartable.  You can run and
>  stop them
> > once.  After you've stopped a reactor, you cannot run it again.  This is
> > the
> > cause of your problem.
> > 
> > Jean-Paul
> 
>  I see.
>  Is it possible to do what I want using twisted? or
>  I should found another way?

You have to go twisted...

Your program should call reactor.run() once and everything you need
your program to do should be started off from twisted callbacks (eg
timer callbacks or deferred objects).

To get your program to do something immediately after it is started,
use reactor.callLater() before calling reactor.run().

You can't mix and match programming styles with twisted - it is all
asynchronous callbacks or nothing in my experience!  That takes a bit
of getting your head round at first.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From kyosohma at gmail.com  Tue May 12 15:38:34 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 12 May 2009 12:38:34 -0700 (PDT)
Subject: How to abort module evaluation?
References: <7c3885ec-41f3-469e-a5a6-7c7ebb5cc939@u10g2000vbd.googlegroups.com>
Message-ID: <ad9fa251-d6b0-40f5-bc69-fa92f8278d9f@g20g2000vba.googlegroups.com>

On May 12, 1:33?pm, mrstevegross <mrstevegr... at gmail.com> wrote:
> I have a python script that is pretty simple: when executed, it
> imports a bunch of stuff and then runs some logic. When *imported*, it
> defines some variables and exits. Here's what it looks like:
>
> === foo.py ===
> if __name__ != '__main__':
> ? x = 1
> ? exit_somehow
>
> import bar
> do_some_stuff...
> === EOF ===
>
> There's a problem, though. On line 3, I wrote "exit_somehow".
> Actually, I have no idea how to do that part. Is there some way I can
> get python to abandon processing the rest of the script at that point?
> I know goto doesn't exist, so that's not an option... sys.exit() won't
> work, because that will abort the entire python interpreter, rather
> than just the evaluation of the module.
>
> Thanks,
> --Steve

Isn't abandoning the processing of the rest of the script exiting the
script? You could use "return" or wrap the offending code in a try/
except block and do something on an exception...

Mike


From totobe at gmail.com  Tue May 12 15:51:37 2009
From: totobe at gmail.com (wdveloper)
Date: Tue, 12 May 2009 12:51:37 -0700 (PDT)
Subject: Call Web Service using proxy and http authentication
References: <3ebae673-2579-4589-b57a-2330c5fe9f3c@j12g2000vbl.googlegroups.com>
	<f8e3d564-b19f-4767-b4cb-b7dfcb86ecca@j18g2000prm.googlegroups.com>
Message-ID: <ebab040f-f2e4-4387-8da6-d568b865785a@o27g2000vbd.googlegroups.com>

On May 12, 8:38?pm, Steve Howell <showel... at yahoo.com> wrote:
> On May 12, 8:59?am, wdveloper <tot... at gmail.com> wrote:
>
> > Hi everyone,
>
> > I am trying to call a webservice which requires an http
> > authentication.
> > To reach the ws, I must pass from a proxy http. So in the whole I need
> > go through two authentications before getting the ws working. I am
> > using SOAPpy and I'm getting quite crazy.
> > I am able to arrange this problem with simple http calls using urllib2
> > but for the ws i dont see any way out.
>
> > Does anyone knows how I can manage this stuff? Is there any better
> > solution or example code?
>
> Your high level description of the problem is good, but I think you'll
> get more help if you provide a little more detail.
>
> For something like this you may want to try to do more at the HTTP
> level, where you have a little more control over the authentication,
> and then find a way to hook into SOAPpy just to build and parse the
> payloads.
>
> How good is your understanding of HTTP? ?Do you know the basics of how
> headers work? ?You might want to brush up a little on HTTP just to
> help understand what's going on; it will almost certainly be valuable
> for future projects as well.
>
> To understand how the proxy works in particular, if you can use the
> proxy to access a normal html-serving website, you can use the "Live
> HTTP Headers" tool under Firefox to see what's going on.
>
> But before all that, I would maybe just post a little more detail on
> the problem. ?Maybe show code you've written so far, and any error
> messages/tracebacks, to better indicate where you are stuck.

Thank you very much Steve,

I do have a good understanding of http and its headers rules, and of
course I can work on that.
On the other hand, I am new to python and SOAPpy toolkit and I dont
have much of an experience working with ws in general.

When it comes of working with simple call to WS, everything is
successfull; problems start cause I dont know how to use the toolkit
to compose the http request. I should code it in the way that it
connects to my proper proxy and it gets authenticated in the server
exposing the service.

What I have is something like:
from SOAPpy import WSDL

wsdl = 'http://myws?wsdl'
my_http_proxy = '10.x.x.x:8080'
proxy = WSDL.Proxy(wsdl, http_proxy=my_http_proxy)
res = proxy.myService( myparam='...' )

What I get is that connection reaches timeout since the server doesnt
see me coming from the right proxy.
First problem, I can't see where I can put my proxy authentication
username and password.
Second, when I will be able to pass through the right proxy, I need to
authenticate on the server via http through my credential.

I am starting wondering whether python+SOAPpy is the right solution or
I need to switch to other solutions (zsi?).

I hope I've been more detailed now and my situation sounds little more
clear.
Thanks again for your precious help!


From aahz at pythoncraft.com  Tue May 12 16:15:28 2009
From: aahz at pythoncraft.com (Aahz)
Date: 12 May 2009 13:15:28 -0700
Subject: Fill Javascript form
References: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>
Message-ID: <gucld0$qqm$1@panix3.panix.com>

In article <3f9c74cf-72f4-45e2-8724-3939366d13bf at e24g2000vbe.googlegroups.com>,
Matteo  <tadwelessar at gmail.com> wrote:
>
>I have to fill a web form to authenticate and connect to the internet.
>I thought it would have been easy to make a script to do that
>automatically on startup.
>
>Unfortunately, it turned out that the form is written in JavaScript,
>and urllib2 therefore fails to even fetch the form.

Depending on whether you can reverse-engineer the form, you can either
just POST data to the webserver or you need to access a JavaScript
library.  Selenium might be an answer to the latter problem; you could
also look into using WebKit.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From dervonb at gmail.com  Tue May 12 16:20:48 2009
From: dervonb at gmail.com (dervonb at gmail.com)
Date: Tue, 12 May 2009 13:20:48 -0700 (PDT)
Subject: Looking for teacher in New York
Message-ID: <08dd3dd8-bfa4-42cb-ab3a-fb34acf0a7ec@t11g2000vbc.googlegroups.com>

I live in brooklyn i'm looking for someone who can help a group of two
or three learn how to use python.
to create games useful softwares and very high level coding
eventually.
in other words how to abuse it's talents for our greater good.

Please respond if you can meet in the brooklyn, manhattan, queens
area.
Please respond if you have info about cheap classes


From exarkun at divmod.com  Tue May 12 16:33:06 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Tue, 12 May 2009 16:33:06 -0400
Subject: issue with twisted and reactor. Can't stop reactor
In-Reply-To: <slrnh0jgeu.ee.nick@irishsea.home.craig-wood.com>
Message-ID: <20090512203306.21531.1369516399.divmod.quotient.20029@henry.divmod.com>

On Tue, 12 May 2009 14:30:04 -0500, Nick Craig-Wood <nick at craig-wood.com> wrote:
>Gabriel <gabriel at opensuse.org> wrote:
>>  Jean-Paul Calderone escribi?:
>>  > None of the reactors in Twisted are restartable.  You can run and
>>  stop them
>> > once.  After you've stopped a reactor, you cannot run it again.  This is
>> > the
>> > cause of your problem.
>> >
>> > Jean-Paul
>>
>>  I see.
>>  Is it possible to do what I want using twisted? or
>>  I should found another way?
>
>You have to go twisted...
>
>Your program should call reactor.run() once and everything you need
>your program to do should be started off from twisted callbacks (eg
>timer callbacks or deferred objects).
>
>To get your program to do something immediately after it is started,
>use reactor.callLater() before calling reactor.run().

reactor.callWhenRunning can also be used (instead of callLater with a very
short delay).

You can also set stuff up first, /then/ call reactor.run().  eg, it is
completely fine to write:

    reactor.connectTCP(...)
    reactor.run()

Jean-Paul


From walterbyrd at iname.com  Tue May 12 16:39:08 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Tue, 12 May 2009 13:39:08 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
Message-ID: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>

I have about 150 unix formated text files that I would like to convert
to dos formated.

I am guessing that I loop though each file in the directory, read each
line and conver the last character, then save to a file with the same
name in another directory.

I am not really sure what I convert the last charactor to.


From deets at nospam.web.de  Tue May 12 16:49:04 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 12 May 2009 22:49:04 +0200
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
Message-ID: <76u5m0F1f1u7pU1@mid.uni-berlin.de>

walterbyrd schrieb:
> I have about 150 unix formated text files that I would like to convert
> to dos formated.
> 
> I am guessing that I loop though each file in the directory, read each
> line and conver the last character, then save to a file with the same
> name in another directory.
> 
> I am not really sure what I convert the last charactor to.

Use recode.

Diez


From google at mrabarnett.plus.com  Tue May 12 16:53:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 12 May 2009 21:53:59 +0100
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
Message-ID: <4A09E1E7.9090001@mrabarnett.plus.com>

walterbyrd wrote:
> I have about 150 unix formated text files that I would like to convert
> to dos formated.
> 
> I am guessing that I loop though each file in the directory, read each
> line and conver the last character, then save to a file with the same
> name in another directory.
> 
> I am not really sure what I convert the last charactor to.

The quickest and OS-agnostic way would be:

     text = open(path, "U").read()
     text = text.replace("\n", "\r\n")
     open(path, "wb").write(text)

That way it doesn't matter if the text file is already dos formatted.


From pavlovevidence at gmail.com  Tue May 12 17:04:41 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 12 May 2009 14:04:41 -0700 (PDT)
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz> 
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
	<pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <b5a92d87-a4ec-46ca-86c0-8b7f3b48cafe@o20g2000vbh.googlegroups.com>

On May 12, 2:35?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Tue, 12 May 2009 09:20:36 +0000, Steven D'Aprano wrote:
> > On Tue, 12 May 2009 20:23:25 +1200, Lawrence D'Oliveiro wrote:
>
> >> In message <gu7f97$mt... at reader1.panix.com>, kj wrote:
>
> >>> I know about the construct:
>
> >>> try:
> >>> ? ? # do something
> >>> except ...:
> >>> ? ? # handle exception
> >>> else:
> >>> ? ? # do something else
>
> >>> ...but I can't come with an example in which the same couldn't be
> >>> accomplished with [no else]
>
> >> I'd agree. If you have to resort to a "try .. else", then might I
> >> respectfully suggest that you're using exceptions in a way that's
> >> complicated enough to get you into trouble.
>
> > try:
> > ? ? rsrc = get(resource)
> > except ResourceError:
> > ? ? log('no more resources available')
> > ? ? raise
> > else:
> > ? ? do_something_with(rsrc)
> > finally:
> > ? ? rsrc.close()
>
> Except of course such a pattern won't work, because if get(resource)
> fails, rsrc will not exist to be closed. So a better, and simpler,
> example would be to drop the finally clause:

Resource acquisition goes outside the try block.  If you want to log
an error, then get() goes inside its own try block.

try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available')
    raise
try:
    do_something_with(rsrc)
finally:
    rsrc.close()


If you hadn't reraised the exception, then the else clause would have
been useful as follows:

try:
    rsrc = get(resource)
except ResourceError:
    proceed_without_resource()
else:
    try:
        proceed_with_resource()
        # Note: proceed_with_resource() can possibly raise
        # ResourceError itself
    finally:
        rsrc.close()

The main reason for the else clause on try blocks is so that you don't
risk catching spurrious exceptions.  You could stick
proceed_with_resource() in the try clause, but then if
proceed_with_resource() throws ResourceError because it tries to
acquire a different resource and fails, then it'd be caught and
proceed_without_resource() would be called, which is a mistake.

In general, you want to limit the contents of a try clause to code
that throws an exception you want to catch (if you're trying to catch
an exception); everything else should go into the else clause.

Incidentally, I can't think of any realistic use cases for using all
four of try...except...else...finally.


Carl Banks


From gdamjan at gmail.com  Tue May 12 17:10:33 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Tue, 12 May 2009 23:10:33 +0200
Subject: Fill Javascript form
References: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>
	<mailman.3.1242076014.8015.python-list@python.org>
	<a91b7799-953e-4751-b18b-791b1a378794@l28g2000vba.googlegroups.com>
Message-ID: <975pd6-npd.ln1@archaeopteryx.softver.org.mk>



> On 11 Mag, 23:06, Shawn Milochik <Sh... at Milochik.com> wrote:
>> How is the form "written in JavaScript"? Is it dynamically generated?
>>
>> In any case, can you just send a POST request if you know the values
>> required?
> 
> The problem is indeed that the form is dynamically generated.
> That's the .js file:


This seems to be generated by ChiliSpot (the most recent code is from 
http://coova.org/wiki/index.php/CoovaChilli), which also has a 
non-interactive or non-browser-based API/Interface. 

They even have custom application for mobile phones, and a 
Firefox extension for using that API.


> if (navigator.appVersion.indexOf("MSIE")!=-1)
> document.write("<script type='text/javascript'
> id='chillicontroller'></ script>");
> 
> if (!window.queryObj) {
>     window.queryObj = new Object();
>     window.location.search.replace(new RegExp("([^?=&]+)(=([^&]
> *))?","g"), function($0,$1,$2,$3) { queryObj[$1] = $3; });
>     if (queryObj['uamip'] == null && queryObj['uamport'] == null)
> {queryObj['uamip']='10.192.0.1';queryObj['uamport']='3990';}
> }
> 
> if (queryObj['uamip'] != null && queryObj['uamport'] != null) {
>     var script = document.getElementById('chillicontroller');
>     if (script == null) {
>   // 	document.write('manutenzione');
> script = document.createElement('script');
> script.id = 'chillicontroller';
> script.type = 'text/javascript';
>     script.src = 'http://'+queryObj['uamip']+':3990/www/
> chillijs.chi';
> 
>     var head = document.getElementsByTagName("head")[0];
>     if (head == null) head = document.body;
> head.appendChild(script);
>    }
>    script=document.getElementById('chillicontroller');
>    if(script==null)document.write('manutenzione');
>     script.src = 'http://'+queryObj['uamip']+':3990/www/chillijs.chi';
> 
> } else {
> //document.write('manutenzione');
>     var noLocation = document.getElementById("noLocation");
>     if (noLocation != null && noLocation.style) {
>        noLocation.style.display = 'inline';
>     }
> }

-- 
?????? ( http://softver.org.mk/damjan/ )

Well when _I_ was in school, I had to run Netscape on HP/UX, displayed on my 
local X Server running on a Windows 3.1 box. Displayed over a 2400 baud 
modem. Uphill. Both ways. In the rain. With NOBODY to hold my hands. Because 
the life of the geek is a lonely life.
- aclarke on /.



From walterbyrd at iname.com  Tue May 12 17:32:43 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Tue, 12 May 2009 14:32:43 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.59.1242161636.8015.python-list@python.org>
Message-ID: <d5e489b5-74ec-4388-9c6b-d7bbe7d60bbb@r31g2000prh.googlegroups.com>

On May 12, 2:53?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> walterbyrd wrote:
> > I have about 150 unix formated text files that I would like to convert
> > to dos formated.
>
> > I am guessing that I loop though each file in the directory, read each
> > line and conver the last character, then save to a file with the same
> > name in another directory.
>
> > I am not really sure what I convert the last charactor to.
>
> The quickest and OS-agnostic way would be:
>
> ? ? ?text = open(path, "U").read()
> ? ? ?text = text.replace("\n", "\r\n")
> ? ? ?open(path, "wb").write(text)
>
> That way it doesn't matter if the text file is already dos formatted.


Thanks, I am not familiar with the "U" here is how I did it:

------------
import os

for file in os.listdir('.'):
	infile = open(file,'r')
	outfile = open( 'new_' + file, 'w')
	for line in infile:
		line = line.rstrip() + '\r\n'
		outfile.write(line)
	infile.close()
	outfile.close()
------------

More code, probably slower, but it worked.


From python-bounces at py.cz  Tue May 12 17:51:00 2009
From: python-bounces at py.cz (python-bounces at py.cz)
Date: Tue, 12 May 2009 23:51:00 +0200
Subject: =?iso-8859-2?q?V=E1=B9_p=F8=EDsp=ECvek_do_konference_Python_=E8e?=
	=?iso-8859-2?q?k=E1_na_schv=E1len=ED_moder=E1torem?=
Message-ID: <mailman.30631.1242165060.31805.python@py.cz>

Va?e zpr?va pro konferenci 'Python' ve v?ci

    RE: SALE 79% 0FF on Pfizer!

Nebyla rozesl?na. Pro jej? distribuci je nutn? souhlas moder?tora.

D?vod pozdr?en? distribuce zpr?vy je:

    P??sp?vek od ne?lena do konference s p?isp?v?n?m omezen?m pouze na
?leny.

Va?e zpr?va bu? bude rozesl?na nebo dostanete zpr?vu o rozhodnut?
moder?tora.

Pokud si zpr?vu nep?ejete rozeslat, m??ete si stornovat na t?to
adrese:

    http://www.py.cz/mailman/confirm/python/fb63a3e8cb9c55286879670152dbda09df3b83bc



From davea at ieee.org  Tue May 12 17:56:17 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 12 May 2009 17:56:17 -0400
Subject: How to abort module evaluation?
In-Reply-To: <7c3885ec-41f3-469e-a5a6-7c7ebb5cc939@u10g2000vbd.googlegroups.com>
References: <7c3885ec-41f3-469e-a5a6-7c7ebb5cc939@u10g2000vbd.googlegroups.com>
Message-ID: <4A09F081.4050208@ieee.org>

mrstevegross wrote:
> I have a python script that is pretty simple: when executed, it
> imports a bunch of stuff and then runs some logic. When *imported*, it
> defines some variables and exits. Here's what it looks like:
>
> === foo.py ===
> if __name__ != '__main__':
>   x = 1
>   exit_somehow
>
> import bar
> do_some_stuff...
> === EOF ===
>
> There's a problem, though. On line 3, I wrote "exit_somehow".
> Actually, I have no idea how to do that part. Is there some way I can
> get python to abandon processing the rest of the script at that point?
> I know goto doesn't exist, so that's not an option... sys.exit() won't
> work, because that will abort the entire python interpreter, rather
> than just the evaluation of the module.
>
> Thanks,
> --Steve
>
>   
use "else" :

=== foo.py ===
if __name__ != '__main__':
  x = 1
  
else:
  import bar
  do_some_stuff...
=== EOF ===


This is rather unconventional usage, however.  In fact, Mike missed the 
!= in your comparison, perhaps because the other way is so common.  The 
usual idiom is:

import some stuff
define some globals, like  x=1
def some functions, classes etc.

if __name__ == "__main__":
    maybe import some extra stuff
    do_some_stuff

In this case, no else is needed,

Notice also that in your case, the x=1 doesn't take effect when you use 
it as a script, but only when it's being imported.  Usually, this is a 
mistake.



From google at mrabarnett.plus.com  Tue May 12 18:03:46 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 12 May 2009 23:03:46 +0100
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <d5e489b5-74ec-4388-9c6b-d7bbe7d60bbb@r31g2000prh.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>	<mailman.59.1242161636.8015.python-list@python.org>
	<d5e489b5-74ec-4388-9c6b-d7bbe7d60bbb@r31g2000prh.googlegroups.com>
Message-ID: <4A09F242.5040604@mrabarnett.plus.com>

walterbyrd wrote:
> On May 12, 2:53 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>> walterbyrd wrote:
>>> I have about 150 unix formated text files that I would like to convert
>>> to dos formated.
>>> I am guessing that I loop though each file in the directory, read each
>>> line and conver the last character, then save to a file with the same
>>> name in another directory.
>>> I am not really sure what I convert the last charactor to.
>> The quickest and OS-agnostic way would be:
>>
>>      text = open(path, "U").read()
>>      text = text.replace("\n", "\r\n")
>>      open(path, "wb").write(text)
>>
>> That way it doesn't matter if the text file is already dos formatted.
> 
> 
> Thanks, I am not familiar with the "U" here is how I did it:
> 
> ------------
> import os
> 
> for file in os.listdir('.'):
> 	infile = open(file,'r')
> 	outfile = open( 'new_' + file, 'w')
> 	for line in infile:
> 		line = line.rstrip() + '\r\n'
> 		outfile.write(line)
> 	infile.close()
> 	outfile.close()
> ------------
> 
> More code, probably slower, but it worked.

That will also strip any whitespace off the end of the lines.

FYI, if you run it on Windows then the resulting lines will end with
"\r\n\n" because the output file is opened in text mode, which will
write any "\n" as "\r\n".


From pavlovevidence at gmail.com  Tue May 12 18:38:18 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 12 May 2009 15:38:18 -0700 (PDT)
Subject: creating classes with mix-ins
References: <d6409bb3-f2ed-4964-942a-b0698060a7f0@e24g2000vbe.googlegroups.com>
	<fe808a4d-26e0-4003-be1a-2e768d7d81cc@r13g2000vbr.googlegroups.com> 
	<5c569b1b-5804-41e5-b384-149f67475af4@m24g2000vbp.googlegroups.com>
Message-ID: <443228fa-6366-4cc5-a843-014aa78fbd69@g20g2000vba.googlegroups.com>

On May 12, 4:45?am, samwyse <samw... at gmail.com> wrote:
> Unfortunately, 'boilerplate()' uses the handlers that I provide when
> MetaBlog is instantiated.

In that case, the handler functions should be attributes of the
instance, not of the class.  Do something like this:

class MetaBlog(object):
    def __init__(self):
        self.blog = blogHander()
        for name in self.blog.get_methods():
            setattr(self,name,self.boilerplate(name))

    def boilerplate(self,name):
        method = getattr(self.blog,name)
        def template(*args):
            self.do_verification_here()
            method(*args)
        return template


Carl Banks


From mensanator at aol.com  Tue May 12 19:56:24 2009
From: mensanator at aol.com (Mensanator)
Date: Tue, 12 May 2009 16:56:24 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
	<4519cc9d-f765-4f55-81b2-58abfa20b988@p4g2000vba.googlegroups.com> 
	<49c224c0-1f58-4ff9-965c-a12f0aa26276@m24g2000vbp.googlegroups.com> 
	<ebc2a31b-02b8-4671-95bb-29cac0e412c3@s21g2000vbb.googlegroups.com> 
	<4bbb12e3-fe7f-40e9-aa24-1cc6c4175a8b@d19g2000prh.googlegroups.com>
Message-ID: <879eb69b-e506-4734-b565-ab20394dc9a6@z19g2000vbz.googlegroups.com>

On May 12, 12:54?pm, George Sakkis <george.sak... at gmail.com> wrote:
> On May 12, 12:49?pm, Mensanator <mensana... at aol.com> wrote:
>
>
>
>
>
> > On May 12, 8:27?am, rump... at web.de wrote:
>
> > > > > > The language and library are missing arbitrary precision integer
> > > > > > arithmetic, using GMP or something like that.
>
> > > > > True, but currently not a high priority for me.
>
> > > > Too bad. That makes Nimrod officially "worthless", i.e., of no
> > > > value to me.
>
> > > Well, you could write a wrapper for GMP (and contribute to the
> > > project ;-)).
>
> > But such a thing already exists in Python. And I spend my time
> > USING arbitrary precision numbers to do math research.
>
> > Just thought you'ld like to be aware that some people actually
> > make their language choices based on the availability (and
> > performance)
> > of arbitrary precision numbers.
>
> I'm sure developers of a new language have to deal with much more
> pressing issues before accommodating each and every self important
> niche.

If he gets enough feedback, won't he learn which niches are important
enought to accommodate? Such feedback was solicited, was it not? If
he
has more pressing issues to deal with, why is he trolling here?



From debl2NoSpam at verizon.net  Tue May 12 19:57:48 2009
From: debl2NoSpam at verizon.net (David Lees)
Date: Tue, 12 May 2009 23:57:48 GMT
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <mailman.22.1242108050.8015.python-list@python.org>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>
	<mailman.22.1242108050.8015.python-list@python.org>
Message-ID: <02oOl.710$wR5.489@nwrddc02.gnilink.net>

Mark Hammond wrote:
> Probably some import statement is finding a .pyd module built against 
> Python 2.5 instead of Python 2.6; it might be that PYTHONPATH points 
> somewhere wrong, or the registry for Python 2.6 is setup wrong, or 
> something else entirely...
> 
> Cheers,
> 
> Mark
> 
> On 12/05/2009 3:13 PM, David Lyon wrote:
>> Hi,
>>
>> hmmm... that's annoying..
>>
>> Whilst I don't have an exact answer I have a few hunches...
>>
>> Perphaps what has happened is that the windows installer between
>> the versions of pywin32 has installed newer versions of the same
>> dlls over the top of older ones.
>>
>> Or, possibly, the installer hasn't wanted to replace older dll's
>> because they already exist on the system.
>>
>> This would result in a mismatch.
>>
>> You may be lucky and find an install log. This might tell you which
>> files were actually installed. And you could play around with
>> moving them around.
>>
>> Good luck with your night vision task....
>>
>> David
>>
>>
>> On Tue, 12 May 2009 02:22:56 GMT, David Lees<debl2NoSpam at verizon.net>
>> wrote:
>>> I have no problem installing Python 2.6.2 for windows under XP SP3 and
>>> IDLE and the command line versions work fine.  When I run the pywin32
>>> installer downloaded from sourceforge (pywin32-212.win32-py2.6.exe) I
>>> get the following error message:
>>>
>>> Traceback (most recent call last):
>>>     File "<string>", line 565, in<module>
>>>     File "<string>", line 291, in install
>>> ImportError: Module use of python25.dll conflicts with this version of
>>> Python.
>>> *** run_installscript: internal error 0xFFFFFFFF ***
>>>
>>> I have tried uninstalling Python 2.6 and reinstalling, but still get the
>>> same message.  I do have Python 2.5.4 and its associated Pywin32 on the
>>> same machine, but I have a laptop with pywin32 installed for both python
>>> 2.5 and 2.6.
>>>
>>> TIA
>>>
>>> David Lees
> 
Mark and David,

Thanks for the help.  I just got it to install for Python 2.6.  All I 
did was change PYTHONPATH (as suggested by Mark) from 
C:\Python25\Lib\site-packages to C:\Python26\Lib\site-packages

David Lees


From tjreedy at udel.edu  Tue May 12 20:12:57 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 12 May 2009 20:12:57 -0400
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
Message-ID: <gud3a4$ej2$1@ger.gmane.org>

walterbyrd wrote:
> I have about 150 unix formated text files that I would like to convert
> to dos formated.

Are you sure you need to do that?  Most Windows programs (including 
Python) are happy reading text files with just \n for line endings.



From norseman at hughes.net  Tue May 12 20:15:12 2009
From: norseman at hughes.net (norseman)
Date: Tue, 12 May 2009 17:15:12 -0700
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
Message-ID: <4A0A1110.8050308@hughes.net>

walterbyrd wrote:
> I have about 150 unix formated text files that I would like to convert
> to dos formated.
> 
> I am guessing that I loop though each file in the directory, read each
> line and conver the last character, then save to a file with the same
> name in another directory.
> 
> I am not really sure what I convert the last charactor to.
===================
Subject line says UNIX to DOS

I hope that means you are using a UNIX machine.

addcr.scr
========
#!/bin/bash
#
cat $1 | sed s/$/$'\x0d'/ >$1.cr
#
#            end of file
========
I have utils on MSDOS that add the cr to get the   crlf sequence
I wrote it for use in the rare occasion. (my definition of rare. :)




rmcr.scr
========
#!/bin/sh
# rmcr.scr
# removes <cr> from text files
# Date: Feb. 2004
#   by: SLT
#     : file dressed up Dec. 2004
#
#   a literal <cr> follows first slash following the s.
#
i=$1
i1=${i%%.*}
echo $i1
cat $1 | sed s/^M// >$i1._cr
#
#            end of file
===========
The ^M will needs to be entered at 'type in' time.
In vi  it is done by  pressing CTRL-V  CTRL-M in sequence
DO NOT CUT n PASTE that line!!!
I have never been able to use the $'\x0d' in this file.
The MSDOS programs don not run on Linux, per se.  'Ya Think' :)


crlf    \r \n     x'0D' x'0A'    CTRL-M  CTRL-J
carriage return, line feed    keep the pair in the order shown.



to use in UNIX:

(be in a bash shell)
bash
for f in *.txt; do addcr.scr $f; done    # going to MSDOS

for f in *.txt; do rmcr.scr $f; done     # returning from MSDOS

if you run these on a binary - the binary is destroyed!!!


If you are in MSDOS, I have no help.
Well - see if you can find and download  FILT.EXE (ver 1.0)
   from the 1980 something era
FILT <Enter>  will present the helpfiles
It's what I use.  I set up batch (.BAT) files to expedite my desires.


Best of Luck


Steve


From david.lyon at preisshare.net  Tue May 12 20:19:05 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 12 May 2009 20:19:05 -0400
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <02oOl.710$wR5.489@nwrddc02.gnilink.net>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>
	<mailman.22.1242108050.8015.python-list@python.org>
	<02oOl.710$wR5.489@nwrddc02.gnilink.net>
Message-ID: <928d1dd50b040644e7cb791ee4cb7683@preisshare.net>

On Tue, 12 May 2009 23:57:48 GMT, David Lees <debl2NoSpam at verizon.net>
> Mark and David,
> 
> Thanks for the help.  I just got it to install for Python 2.6.  All I 
> did was change PYTHONPATH (as suggested by Mark) from 
> C:\Python25\Lib\site-packages to C:\Python26\Lib\site-packages

lol - so simple...

Thankfully, we got a quick answer by the package writing master himself.. 

but imho - package installation shouldn't be that tricky.. it should be
click and shoot... which is what i'm working on doing..

I have to say that I don't mind being corrected because I learnt 
something valuable too... 

David



From trevor.lango at gmail.com  Tue May 12 20:20:15 2009
From: trevor.lango at gmail.com (Trevor)
Date: Tue, 12 May 2009 17:20:15 -0700 (PDT)
Subject: py2exe + win32com + DAO
Message-ID: <30bcf41a-f6fe-4580-9735-888fbef419f1@v23g2000pro.googlegroups.com>

I have a Python code module that adds records to a MS Access
database.  The following line of code executes successfully when the
code module is run as a Python script:

daoEngine = win32com.client.Dispatch(r'DAO.DBEngine.36')

It also runs successfully when the Python script is compiled and run
as an executable using the Py2exe utility.  However, when the compiled
executable is called from VBA using the win32 CreateProcess function,
the preceding code produces this output:

!!python/name:pywintypes.com_error ''

What is causing this error?


From david.lyon at preisshare.net  Tue May 12 20:31:11 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 12 May 2009 20:31:11 -0400
Subject: py2exe + win32com + DAO
In-Reply-To: <30bcf41a-f6fe-4580-9735-888fbef419f1@v23g2000pro.googlegroups.com>
References: <30bcf41a-f6fe-4580-9735-888fbef419f1@v23g2000pro.googlegroups.com>
Message-ID: <4d2f31bd5f0fdd403256e055de676f4e@preisshare.net>


Maybe VB is opening the table in Exclusive mode... then when you
are opening it as a subprocess, it's already locked.

It's possible the win32com module is not giving you a very
descriptive error message.

Try running your process while vb is running at the same time
with the database open and if you get the same error then it 
might confirm my assertion.

Otherwise it is likely that it is something else.

On Tue, 12 May 2009 17:20:15 -0700 (PDT), Trevor <trevor.lango at gmail.com>
wrote:
> I have a Python code module that adds records to a MS Access
> database.  The following line of code executes successfully when the
> code module is run as a Python script:
> 
> daoEngine = win32com.client.Dispatch(r'DAO.DBEngine.36')
> 
> It also runs successfully when the Python script is compiled and run
> as an executable using the Py2exe utility.  However, when the compiled
> executable is called from VBA using the win32 CreateProcess function,
> the preceding code produces this output:
> 
> !!python/name:pywintypes.com_error ''
> 
> What is causing this error?


From drobinow at gmail.com  Tue May 12 21:28:13 2009
From: drobinow at gmail.com (David Robinow)
Date: Tue, 12 May 2009 21:28:13 -0400
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <02oOl.710$wR5.489@nwrddc02.gnilink.net>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>
	<mailman.22.1242108050.8015.python-list@python.org>
	<02oOl.710$wR5.489@nwrddc02.gnilink.net>
Message-ID: <4eb0089f0905121828x4e844f92ocab3fc2f716ff045@mail.gmail.com>

> Thanks for the help. ?I just got it to install for Python 2.6. ?All I did
> was change PYTHONPATH (as suggested by Mark) from
> C:\Python25\Lib\site-packages to C:\Python26\Lib\site-packages

Why do you have PYTHONPATH set at all?


From aahz at pythoncraft.com  Tue May 12 21:46:27 2009
From: aahz at pythoncraft.com (Aahz)
Date: 12 May 2009 18:46:27 -0700
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
	<guao50$1jv$1@panix3.panix.com>
	<Xns9C09513903E8FrtwfreenetREMOVEcouk@216.196.109.145>
Message-ID: <gud8pj$b3g$1@panix3.panix.com>

In article <Xns9C09513903E8FrtwfreenetREMOVEcouk at 216.196.109.145>,
Rob Williscroft  <rtw at freenet.co.uk> wrote:
>Aahz wrote in news:guao50$1jv$1 at panix3.panix.com in comp.lang.python:
>> In article <Xns9C08E179B66D8rtwfreenetREMOVEcouk at 216.196.109.145>,
>> Rob Williscroft  <rtw at freenet.co.uk> wrote:
>>>
>>>db.execute( '''
>>>         update "sessions" set "uid" = ?
>>>         where "uid" = ? 
>>>         and exists(
>>>                  select * from "users" where "uid" = ?
>>>           )
>>>    ''',
>>>    (v['uid'],s.SID, v['uid']) 
>>>  )
>> 
>> This will be more efficient if you do "select uid from users".
>
>What will be more efficient ?
>
>Do you mean the "select * ..." or do you want to take the exists 
>sub-query out and put it in a python if ? 

"select uid" will be more efficient than "select *", although I suppose
I could be wrong about that given how little I know about current query
optimizers.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From p_hemans at hotmail.com  Tue May 12 22:20:21 2009
From: p_hemans at hotmail.com (Paul Hemans)
Date: Tue, 12 May 2009 19:20:21 -0700 (PDT)
Subject: Help with a HTTP GET request
Message-ID: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>

I am trying to build a HTTP request that looks like:
http://localhost/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS%20sync=''%20schema=''%20class='replicateApplication.getChanges'%20/>
Works in a browser.

lxml.parse() gives me:
failed to load external entity

urllib2.urlopen() gives me:
Bad request

So I am trying httplib I have encoded the GET request with urllib.quote
()
and now I am attempting to use HTTPConnection
>>> conn = httplib.HTTPConnection("localhost")
>>> print x
%3CPROCESS%20sync%3D%27%27%20schema%3D%27%27%20class%3D
%27replicateApplication.getChanges%27%20/%3E
>>> this = conn.putrequest("GET",x)
>>> conn.endheaders()
>>> r = conn.getresponse()
>>> print r.read()
<html><head><title>Error</title></head><body>The parameter is
incorrect.
</body></html>

Any help would be appreciated.




From clp2 at rebertia.com  Tue May 12 22:30:35 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 12 May 2009 19:30:35 -0700
Subject: Help with a HTTP GET request
In-Reply-To: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
References: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
Message-ID: <50697b2c0905121930x5c469e64v5843156bc044f2de@mail.gmail.com>

On Tue, May 12, 2009 at 7:20 PM, Paul Hemans <p_hemans at hotmail.com> wrote:
> I am trying to build a HTTP request that looks like:
> http://localhost/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS%20sync=''%20schema=''%20class='replicateApplication.getChanges'%20/>
> Works in a browser.

I'm not 100% sure, but I don't think you can have < or > in a URL.
Your browser might be implicitly encoding them for you somehow.

Cheers,
Chris
-- 
http://blog.rebertia.com


From apt.shansen at gmail.com  Tue May 12 22:32:55 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Tue, 12 May 2009 19:32:55 -0700
Subject: Help with a HTTP GET request
In-Reply-To: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
References: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
Message-ID: <7a9c25c20905121932y634f8c42yc366501e2da81674@mail.gmail.com>

> I am trying to build a HTTP request that looks like:
> http://localhost/common/foxisapi.dll/tmsmail.x2.isapi
> ?<PROCESS%20sync=''%20schema=''%20class='replicateApplication.getChanges'%20/>
> Works in a browser.
>
> and now I am attempting to use HTTPConnection
> >>> conn = httplib.HTTPConnection("localhost")
> >>> print x
> %3CPROCESS%20sync%3D%27%27%20schema%3D%27%27%20class%3D
> %27replicateApplication.getChanges%27%20/%3E


At first glance, you left off most of the request :) Namely "
/common/foxisapi.dll/tmsmail.x2.isapi<http://localhost/common/foxisapi.dll/tmsmail.x2.isapi>
?"

And just included the encoded body.

--S
-------------- next part --------------
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From sjmachin at lexicon.net  Tue May 12 22:44:10 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 12 May 2009 19:44:10 -0700 (PDT)
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
	<guao50$1jv$1@panix3.panix.com> 
	<Xns9C09513903E8FrtwfreenetREMOVEcouk@216.196.109.145>
	<gud8pj$b3g$1@panix3.panix.com>
Message-ID: <b722bd36-c8f1-4cdf-8625-2550cee21511@i28g2000prd.googlegroups.com>

On May 13, 11:46?am, a... at pythoncraft.com (Aahz) wrote:
> In article <Xns9C09513903E8FrtwfreenetREMOVEc... at 216.196.109.145>,
> Rob Williscroft ?<r... at freenet.co.uk> wrote:
>
>
>
> >Aahz wrote innews:guao50$1jv$1 at panix3.panix.comin comp.lang.python:
> >> In article <Xns9C08E179B66D8rtwfreenetREMOVEc... at 216.196.109.145>,
> >> Rob Williscroft ?<r... at freenet.co.uk> wrote:
>
> >>>db.execute( '''
> >>> ? ? ? ? update "sessions" set "uid" = ?
> >>> ? ? ? ? where "uid" = ?
> >>> ? ? ? ? and exists(
> >>> ? ? ? ? ? ? ? ? ?select * from "users" where "uid" = ?
> >>> ? ? ? ? ? )
> >>> ? ?''',
> >>> ? ?(v['uid'],s.SID, v['uid'])
> >>> ?)
>
> >> This will be more efficient if you do "select uid from users".
>
> >What will be more efficient ?
>
> >Do you mean the "select * ..." or do you want to take the exists
> >sub-query out and put it in a python if ?
>
> "select uid" will be more efficient than "select *", although I suppose
> I could be wrong about that given how little I know about current query
> optimizers.

My take is that it won't matter what you select if the optimiser is
smart enough; something that requires minimal resources to produce is
indicated in case the optimiser is dumb:

 ... exists (select 1 from ... )



From usernet at ilthio.net  Tue May 12 23:12:40 2009
From: usernet at ilthio.net (Tim Harig)
Date: Wed, 13 May 2009 03:12:40 GMT
Subject: Help with a HTTP GET request
References: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
Message-ID: <IUqOl.22226$as4.7873@nlpi069.nbdc.sbc.com>

On 2009-05-13, Paul Hemans <p_hemans at hotmail.com> wrote:
> http://localhost/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS%20sync=''%20schema=''%20class='replicateApplication.getChanges'%20/>

Note the entire URL.
> So I am trying httplib I have encoded the GET request with urllib.quote

urllib would be much easier if you don't need low level control -- it will
automatically call httplib for you.

>>>> conn = httplib.HTTPConnection("localhost")
>>>> print x
> %3CPROCESS%20sync%3D%27%27%20schema%3D%27%27%20class%3D
> %27replicateApplication.getChanges%27%20/%3E
>>>> this = conn.putrequest("GET",x)

For one, x does not contain the entire request.
"/common/foxisapi.dll/tmsmail.x2.isapi?"  Should also be part of the
request; otherwise, the server doesn't know which script to call.  Your
script is requesting the QUERY_STRING instead of requesting the proper
script and handing the QUERY_STRING to it.  The report you are getting back
is likely your default top level script minus any rewrites or redirection.

If you just need the content of the request, then I suggest using urllib:

import urllib
url = "http://localhost/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS%20sync=''%20schema=''%20class='replicateApplication.getChanges'%20/"
content = urllib.urlopen(url).read()


From usernet at ilthio.net  Tue May 12 23:28:17 2009
From: usernet at ilthio.net (Tim Harig)
Date: Wed, 13 May 2009 03:28:17 GMT
Subject: Help with a HTTP GET request
References: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
	<IUqOl.22226$as4.7873@nlpi069.nbdc.sbc.com>
Message-ID: <l7rOl.22227$as4.7912@nlpi069.nbdc.sbc.com>

On 2009-05-13, Tim Harig <usernet at ilthio.net> wrote:
> import urllib
> url = "http://localhost/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS%20sync=''%20schema=''%20class='replicateApplication.getChanges'%20/"
> content = urllib.urlopen(url).read()

forgot to urlencode:

host = "http://localhost"
request = r"""/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS sync='' schema='' class='replicateApplication.getChanges' /"""
url = host + urllib.quote(request)
content = urllib.urlopen(url).read()


From sajmikins at gmail.com  Tue May 12 23:29:50 2009
From: sajmikins at gmail.com (Simon Forman)
Date: Tue, 12 May 2009 20:29:50 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
Message-ID: <fba2439b-a473-47e9-892e-cbb445a7a12c@z7g2000vbh.googlegroups.com>

On May 12, 4:39?pm, walterbyrd <walterb... at iname.com> wrote:
> I have about 150 unix formated text files that I would like to convert
> to dos formated.
>
> I am guessing that I loop though each file in the directory, read each
> line and conver the last character, then save to a file with the same
> name in another directory.
>
> I am not really sure what I convert the last charactor to.

Python source includes tool for this: lfcr.py

http://svn.python.org/view/python/trunk/Tools/scripts/lfcr.py?view=markup

Depending on how python was installed on your system you might already
have this script on your system.  (FYI there's also a crlf.py script
in the same directory too.)

HTH
~Simon


From martin at v.loewis.de  Tue May 12 23:32:16 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Wed, 13 May 2009 05:32:16 +0200
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <mailman.65.1242174135.8015.python-list@python.org>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>	<mailman.22.1242108050.8015.python-list@python.org>	<02oOl.710$wR5.489@nwrddc02.gnilink.net>
	<mailman.65.1242174135.8015.python-list@python.org>
Message-ID: <4a0a3f40$0$24009$9b622d9e@news.freenet.de>

> lol - so simple...
> 
> Thankfully, we got a quick answer by the package writing master himself.. 
> 
> but imho - package installation shouldn't be that tricky.. it should be
> click and shoot... which is what i'm working on doing..
> 
> I have to say that I don't mind being corrected because I learnt 
> something valuable too... 

I think this was a case of obscure misconfiguration of the system.
It is always possible to configure a system in such a way that even
the most resilient installation procedure will break.

Regards,
Martin


From usernet at ilthio.net  Tue May 12 23:38:22 2009
From: usernet at ilthio.net (Tim Harig)
Date: Wed, 13 May 2009 03:38:22 GMT
Subject: Help with a HTTP GET request
References: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
	<IUqOl.22226$as4.7873@nlpi069.nbdc.sbc.com>
	<l7rOl.22227$as4.7912@nlpi069.nbdc.sbc.com>
Message-ID: <OgrOl.22228$as4.5941@nlpi069.nbdc.sbc.com>

On 2009-05-13, Tim Harig <usernet at ilthio.net> wrote:
> host = "http://localhost"
> request = r"""/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS sync='' schema='' class='replicateApplication.getChanges' /"""
> url = host + urllib.quote(request)
> content = urllib.urlopen(url).read()

Which accidentally encodes the '?' separator.  Third times a charm:
host = "http://localhost"
script = "/common/foxisapi.dll/tmsmail.x2.isapi"
getData = r"""<PROCESS sync='' schema='' class='replicateApplication.getChanges' /"""
url = host + script + '?' + urllib.quote(getData)
content = urllib.urlopen(url).read()


From walterbyrd at iname.com  Tue May 12 23:42:26 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Tue, 12 May 2009 20:42:26 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.63.1242173586.8015.python-list@python.org>
Message-ID: <2cdfbdbf-8b26-486d-9abc-3422bddbe569@d2g2000pra.googlegroups.com>

On May 12, 6:12?pm, Terry Reedy <tjre... at udel.edu> wrote:

> Are you sure you need to do that? ?Most Windows programs (including
> Python) are happy reading text files with just \n for line endings.

These files will be looked at by some non-technical people. I am sure
these people will just click on the icons, and the file will come up
in notepad.

But, you are correct, I know that wordpad, and notepad++, and many
other apps will read the UNIX formated files just fine. IMO: notepad
is total junk, but it's still the default text editor on windows.


From walterbyrd at iname.com  Tue May 12 23:47:34 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Tue, 12 May 2009 20:47:34 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.64.1242173699.8015.python-list@python.org>
Message-ID: <cb3e2b24-d52f-46b0-9d5d-72564ae44833@a5g2000pre.googlegroups.com>

On May 12, 6:15?pm, norseman <norse... at hughes.net> wrote:

> Subject line says UNIX to DOS
>
> I hope that means you are using a UNIX machine.
>

I should have mentioned, I am working in an environment that is very
restrictive about what I can put on my XP desktop. I can not put
python, or even notepad++, on my desktop. But, I do have cygwin.

As you probably know, cygwin formats to UNIX.


From walterbyrd at iname.com  Tue May 12 23:56:55 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Tue, 12 May 2009 20:56:55 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.64.1242173699.8015.python-list@python.org>
Message-ID: <386bf8eb-0398-4345-9a02-68809d53a55b@d38g2000prn.googlegroups.com>

Thanks for shell script code. That code may be just as efficient, or
even more efficient, than python. But, to me, python is far more
readable.

------------
i=$1
i1=${i%%.*}
echo $i1
cat $1 | sed s/^M// >$i1._cr
-----------=


------------
import os

for file in os.listdir('.'):
        infile = open(file,'r')
        outfile = open( 'new_' + file, 'w')
        for line in infile:
                line = line.rstrip() + '\r\n'
                outfile.write(line)
        infile.close()
        outfile.close()
------------



From chinthakawk at gmail.com  Wed May 13 00:10:53 2009
From: chinthakawk at gmail.com (godshorse)
Date: Tue, 12 May 2009 21:10:53 -0700 (PDT)
Subject: Representing a Tree in Python
Message-ID: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>

Hello,

I want to find out the shortest path tree from a root to several nodes
in a graph data structure. I found a Dijkstra code from internet that
finds shortest path between only two nodes. How can i extend it to a
tree?. And what is the best way to represent a tree in Python?.

Thank you,


From paul.hemans at gmail.com  Wed May 13 00:15:20 2009
From: paul.hemans at gmail.com (Carbon-based)
Date: Tue, 12 May 2009 21:15:20 -0700 (PDT)
Subject: Help with a HTTP GET request
References: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
	<IUqOl.22226$as4.7873@nlpi069.nbdc.sbc.com>
	<l7rOl.22227$as4.7912@nlpi069.nbdc.sbc.com> 
	<OgrOl.22228$as4.5941@nlpi069.nbdc.sbc.com>
Message-ID: <a9521cec-34a8-481a-ab77-95dd952f4322@b6g2000pre.googlegroups.com>

Great, thank you very much.

On May 13, 1:38?pm, Tim Harig <user... at ilthio.net> wrote:
> On 2009-05-13, Tim Harig <user... at ilthio.net> wrote:
>
> > host = "http://localhost"
> > request = r"""/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS sync='' schema='' class='replicateApplication.getChanges' /"""
> > url = host + urllib.quote(request)
> > content = urllib.urlopen(url).read()
>
> Which accidentally encodes the '?' separator. ?Third times a charm:
> host = "http://localhost"
> script = "/common/foxisapi.dll/tmsmail.x2.isapi"
> getData = r"""<PROCESS sync='' schema='' class='replicateApplication.getChanges' /"""
> url = host + script + '?' + urllib.quote(getData)
> content = urllib.urlopen(url).read()



From warhammer1805 at gmail.com  Wed May 13 00:18:15 2009
From: warhammer1805 at gmail.com (warhammer1805 at gmail.com)
Date: Tue, 12 May 2009 21:18:15 -0700 (PDT)
Subject: New to python, can i ask for a little help?
Message-ID: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>

I loaded python 3.1
I can use the gui and i see the following:

Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>>

It would seem that this is working correctly and there is no path
problem.
I am running windows vista.

When i put in a test string i see this:

Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> print "hello world!"
SyntaxError: invalid syntax (<pyshell#0>, line 1)
>>>

Can anyone tell me what is wrong? I didnt expect that error....

Andrew


From david.lyon at preisshare.net  Wed May 13 00:18:47 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Wed, 13 May 2009 00:18:47 -0400
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <4a0a3f40$0$24009$9b622d9e@news.freenet.de>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>	<mailman.22.1242108050.8015.python-list@python.org>	<02oOl.710$wR5.489@nwrddc02.gnilink.net>
	<mailman.65.1242174135.8015.python-list@python.org>
	<4a0a3f40$0$24009$9b622d9e@news.freenet.de>
Message-ID: <64fc05ead382d1a8490deb9a07bd5f01@preisshare.net>

On Wed, 13 May 2009 05:32:16 +0200, "Martin v. L?wis" <martin at v.loewis.de>
wrote:
 
> I think this was a case of obscure misconfiguration of the system.
> It is always possible to configure a system in such a way that even
> the most resilient installation procedure will break.

Technically, you are right..

but imho.. windows installers are overkill and shouldn't be used
for this sort of thing. That is, installing libraries. And not
the fault of the package authors either...

if we could clean up the python universe and ensure all packages
are in either .egg or distutils packages then i think it would
be a nicer place...

Take care

David 



From greg at cosc.canterbury.ac.nz  Wed May 13 00:20:25 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Wed, 13 May 2009 16:20:25 +1200
Subject: What's the use of the else in try/except/else?
In-Reply-To: <gu9fl8$nmh$1@reader1.panix.com>
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net>
	<gu9fl8$nmh$1@reader1.panix.com>
Message-ID: <76v01gF1evk90U1@mid.individual.net>

kj wrote:

> Wow.  As rationales for syntax constructs go, this has got to be
> the most subtle one I've ever seen...

It's to avoid masking bugs. Suppose you accidentally
wrote

   try:
     v = mumble.field
     sys.warming('field was actually there?')
   except AttributeError:
     pass

Then you could easily fail to notice that
you had written 'warming' instead of 'warning'.

-- 
Greg


From sam at tregar.com  Wed May 13 00:25:24 2009
From: sam at tregar.com (Sam Tregar)
Date: Wed, 13 May 2009 00:25:24 -0400
Subject: New to python, can i ask for a little help?
In-Reply-To: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
References: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
Message-ID: <fe3354e50905122125y34c8ee0fv762a009c1e0e36a4@mail.gmail.com>

On Wed, May 13, 2009 at 12:18 AM, warhammer1805 at gmail.com <
warhammer1805 at gmail.com> wrote:

> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.
> >>> print "hello world!"
> SyntaxError: invalid syntax (<pyshell#0>, line 1)
> >>>
>
> Can anyone tell me what is wrong? I didnt expect that error....
>

Try:

  print("hello world!")

I believe Python 3 requires parenthesis for print.  Someone else can explain
why perhaps.

-sam
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From clp2 at rebertia.com  Wed May 13 00:27:05 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 12 May 2009 21:27:05 -0700
Subject: New to python, can i ask for a little help?
In-Reply-To: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
References: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
Message-ID: <50697b2c0905122127g53590a8fp6b073dbeedeefea7@mail.gmail.com>

On Tue, May 12, 2009 at 9:18 PM, warhammer1805 at gmail.com
<warhammer1805 at gmail.com> wrote:
> I loaded python 3.1
> I can use the gui and i see the following:
>
> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.
>>>>
>
> It would seem that this is working correctly and there is no path
> problem.
> I am running windows vista.
>
> When i put in a test string i see this:
>
> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.
>>>> print "hello world!"
> SyntaxError: invalid syntax (<pyshell#0>, line 1)
>>>>
>
> Can anyone tell me what is wrong? I didnt expect that error....

The print-statement was removed in Python 3.0. Now it's just a
function. You'll have to use:

print("hello world!")

instead.

Please also read the 3.0 transition docs:
http://docs.python.org/3.0/whatsnew/3.0.html
Note that Python 3.0 differs significantly from Python 2.x

Cheers,
Chris
-- 
http://blog.rebertia.com


From mensanator at aol.com  Wed May 13 00:31:01 2009
From: mensanator at aol.com (Mensanator)
Date: Tue, 12 May 2009 21:31:01 -0700 (PDT)
Subject: New to python, can i ask for a little help?
References: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
Message-ID: <9e50740c-ac6a-4646-b9c0-fdeeb0c3f6c2@m24g2000vbp.googlegroups.com>

On May 12, 11:18?pm, "warhammer1... at gmail.com"
<warhammer1... at gmail.com> wrote:
> I loaded python 3.1
> I can use the gui and i see the following:
>
> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.
>
>
>
> It would seem that this is working correctly and there is no path
> problem.
> I am running windows vista.
>
> When i put in a test string i see this:
>
> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.>>> print "hello world!"
>
> SyntaxError: invalid syntax (<pyshell#0>, line 1)
>
>
>
> Can anyone tell me what is wrong?

You're using Python 3.0.1. Print is now a function.
I think you would do print("Hello World"). Look it
up in the documentation.

> I didnt expect that error....

And it would have worked in Python 2.x.

>
> Andrew



From debatem1 at gmail.com  Wed May 13 00:54:13 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 12 May 2009 21:54:13 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
Message-ID: <22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com>

On May 13, 12:10?am, godshorse <chinthak... at gmail.com> wrote:
> Hello,
>
> I want to find out the shortest path tree from a root to several nodes
> in a graph data structure. I found a Dijkstra code from internet that
> finds shortest path between only two nodes. How can i extend it to a
> tree?. And what is the best way to represent a tree in Python?.
>
> Thank you,

Well, I'm biased, but I like <URL: http://graphine.org>.
As an example, to build a five node tree:

>>> from graph.base import Graph
>>> g = Graph()
>>> for i in range(5):
...     g.add_node(i)
...
>>> g.add_edge(0, 1)
>>> g.add_edge(0, 2)
>>> g.add_edge(1, 3)
>>> g.add_edge(1, 4)

And to find the shortest path between, say, node 0 and node 4:

>>> start = g[0]
>>> end = g[4]
>>> distance, edges = g.get_shortest_paths(start)[end]
>>> distance
2
>>> edges
[Edge(name=(0,1)), Edge(name=(1,4))]

Let me know what you think if you decide to use it- I'm looking for
feedback.

Geremy Condra


From trevor.lango at gmail.com  Wed May 13 01:06:42 2009
From: trevor.lango at gmail.com (Trevor)
Date: Tue, 12 May 2009 22:06:42 -0700 (PDT)
Subject: py2exe + win32com + DAO
References: <30bcf41a-f6fe-4580-9735-888fbef419f1@v23g2000pro.googlegroups.com>
	<mailman.66.1242174861.8015.python-list@python.org>
Message-ID: <9035670f-9057-4f3d-bfbb-5d693d030f62@y6g2000prf.googlegroups.com>

I do not believe your assertion applies to the following line of code:

daoEngine = win32com.client.Dispatch(r'DAO.DBEngine.36')

The preceding code snippet instantiates a COM object and is
prerequisite to creating a reference to a specific database:

daoDB = daoEngine.OpenDatabase(dbname)

As the compiled Python module executes successfully when invoked from
a command-line but not when invoked using the win32 CreateProcess
function, I suspect that one or more of the arguments to CreateProcess
is preventing successful execution.  I will investigate this further
(possibly on a win32 forum); however, is it possible to obtain more
verbose error output from Python modules?  The error message in the
original post was generated from:

print sys.exc_info()[0]

On May 12, 5:31?pm, David Lyon <david.l... at preisshare.net> wrote:
> Maybe VB is opening the table in Exclusive mode... then when you
> are opening it as a subprocess, it's already locked.
>
> It's possible the win32com module is not giving you a very
> descriptive error message.
>
> Try running your process while vb is running at the same time
> with the database open and if you get the same error then it
> might confirm my assertion.
>
> Otherwise it is likely that it is something else.
>
> On Tue, 12 May 2009 17:20:15 -0700 (PDT), Trevor <trevor.la... at gmail.com>
> wrote:
>
> > I have a Python code module that adds records to a MS Access
> > database. ?The following line of code executes successfully when the
> > code module is run as a Python script:
>
> > daoEngine = win32com.client.Dispatch(r'DAO.DBEngine.36')
>
> > It also runs successfully when the Python script is compiled and run
> > as an executable using the Py2exe utility. ?However, when the compiled
> > executable is called from VBA using the win32 CreateProcess function,
> > the preceding code produces this output:
>
> > !!python/name:pywintypes.com_error ''
>
> > What is causing this error?
>
>



From asmodai at in-nomine.org  Wed May 13 01:36:06 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Wed, 13 May 2009 07:36:06 +0200
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <cb3e2b24-d52f-46b0-9d5d-72564ae44833@a5g2000pre.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.64.1242173699.8015.python-list@python.org>
	<cb3e2b24-d52f-46b0-9d5d-72564ae44833@a5g2000pre.googlegroups.com>
Message-ID: <20090513053606.GB24353@nexus.in-nomine.org>

-On [20090513 05:53], walterbyrd (walterbyrd at iname.com) wrote:
>As you probably know, cygwin formats to UNIX.

That entirely depends on how you install it.

Anyway, I am sure the Cygwin repository has the tools dos2unix/unix2dos
available for installation.

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
In short may I, directly and indirectly, offer benefit and happiness to all
beings, may I secretly take upon myself the harm and suffering of all
beings...


From david.lyon at preisshare.net  Wed May 13 02:00:52 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Wed, 13 May 2009 02:00:52 -0400
Subject: py2exe + win32com + DAO
In-Reply-To: <9035670f-9057-4f3d-bfbb-5d693d030f62@y6g2000prf.googlegroups.com>
References: <30bcf41a-f6fe-4580-9735-888fbef419f1@v23g2000pro.googlegroups.com>
	<mailman.66.1242174861.8015.python-list@python.org>
	<9035670f-9057-4f3d-bfbb-5d693d030f62@y6g2000prf.googlegroups.com>
Message-ID: <4197fbb66026f3bb350f23cdf3983dc0@preisshare.net>

On Tue, 12 May 2009 22:06:42 -0700 (PDT), Trevor <trevor.lango at gmail.com>
wrote:
> I do not believe your assertion applies to the following line of code:
> 
> daoEngine = win32com.client.Dispatch(r'DAO.DBEngine.36')

It doesn't. I'm simply suggesting that it is possible you are opening
the database in Access or something in Administrator/dba mode. That
could be causing an exclusive lock on the database so that no sub
task can then open it. 

i have seen this on old versions of Access.

To provide excellent performance, microsoft used to load the whole
database into memory if it could. And just operate mostly from there.


> is it possible to obtain more
> verbose error output from Python modules?  The error message in the
> original post was generated from:
> 
> print sys.exc_info()[0]

possibly but i'm not sure how...

David



From scott at starlon.net  Wed May 13 02:10:25 2009
From: scott at starlon.net (Scott Flynn)
Date: Wed, 13 May 2009 01:10:25 -0500
Subject: Updates to enviironment variables and ctypes
Message-ID: <cb4d391b0905122310y35c1090l666aa037789e5bff@mail.gmail.com>

I was hoping I could update LD_LIBRARY_PATH at runtime and load a library
through ctypes from there, but I haven't been able to.

I've tried all of these.

os.environ['LD_LIBRARY_PATH'] = "./lib"
os.putenv('LD_LIBRARY_PATH', "./lib")
os.system("export LD_LIBRARY_PATH=./lib")
lib = CDLL("libevaluator.so")

Traceback (most recent call last):
  File "Evaluator.py", line 9, in <module>
    lib = CDLL("libevaluator.so")
  File "/usr/lib/python2.5/ctypes/__init__.py", line 348, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: libevaluator.so: cannot open shared object file: No such file or
directory

The only thing that works is to set the variable before starting Python. I'm
assuming that's just how it's going to be. Is this a bug or is it meant to
be?
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From chinthakawk at gmail.com  Wed May 13 02:31:07 2009
From: chinthakawk at gmail.com (godshorse)
Date: Tue, 12 May 2009 23:31:07 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com>
Message-ID: <43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>

On May 13, 11:54?am, CTO <debat... at gmail.com> wrote:
> On May 13, 12:10?am, godshorse <chinthak... at gmail.com> wrote:
>
> > Hello,
>
> > I want to find out the shortest path tree from a root to several nodes
> > in a graph data structure. I found a Dijkstra code from internet that
> > finds shortest path between only two nodes. How can i extend it to a
> > tree?. And what is the best way to represent a tree in Python?.
>
> > Thank you,
>
> Well, I'm biased, but I like <URL:http://graphine.org>.
> As an example, to build a five node tree:
>
> >>> from graph.base import Graph
> >>> g = Graph()
> >>> for i in range(5):
>
> ... ? ? g.add_node(i)
> ...
>
> >>> g.add_edge(0, 1)
> >>> g.add_edge(0, 2)
> >>> g.add_edge(1, 3)
> >>> g.add_edge(1, 4)
>
> And to find the shortest path between, say, node 0 and node 4:
>
> >>> start = g[0]
> >>> end = g[4]
> >>> distance, edges = g.get_shortest_paths(start)[end]
> >>> distance
> 2
> >>> edges
>
> [Edge(name=(0,1)), Edge(name=(1,4))]
>
> Let me know what you think if you decide to use it- I'm looking for
> feedback.
>
> Geremy Condra

Thanks very much for your reply Geremy. That site was interesting.

Actually the Graph building part is already completed now. I used a
dictionary for that and it works fine. for Dijkstra shortest path
problem your suggestion can be used.

But let me clear the my problem again. I have a graph. and I want to
find 'shortest path tree' from a root node to several nodes. as a
example if we have a graph of 5 nodes from 1 to 5, I need to build the
shortest path tree from node 1 to nodes 2,3,5. So my question is
instead of keeping separate lists for each destination node's shortest
path. How can I represent and store them in a tree structure using
python. Then I can easily find out what are the common nodes in the
path to each destination.

Thanks once again.


From guang.zeng37 at gmail.com  Wed May 13 02:45:09 2009
From: guang.zeng37 at gmail.com (guang.zeng37 at gmail.com)
Date: Tue, 12 May 2009 23:45:09 -0700 (PDT)
Subject: New to python, can i ask for a little help?
References: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
Message-ID: <69c884d3-6677-4b7c-9553-ceaf6ba5bd2f@s1g2000prd.googlegroups.com>

On May 13, 12:18?pm, "warhammer1... at gmail.com"
<warhammer1... at gmail.com> wrote:
> I loaded python 3.1
> I can use the gui and i see the following:
>
> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.
>
>
>
> It would seem that this is working correctly and there is no path
> problem.
> I am running windows vista.
>
> When i put in a test string i see this:
>
> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.>>> print "hello world!"
>
> SyntaxError: invalid syntax (<pyshell#0>, line 1)
>
>
>
> Can anyone tell me what is wrong? I didnt expect that error....
>
> Andrew

print is a function. So you should do it this way: print("hello
world!")


From debatem1 at gmail.com  Wed May 13 02:56:50 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 12 May 2009 23:56:50 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com> 
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>
Message-ID: <31d0fc86-05d9-4f07-9076-1e8c13cff7a1@j12g2000vbl.googlegroups.com>

> But let me clear the my problem again. I have a graph. and I want to
> find 'shortest path tree' from a root node to several nodes. as a
> example if we have a graph of 5 nodes from 1 to 5, I need to build the
> shortest path tree from node 1 to nodes 2,3,5. So my question is
> instead of keeping separate lists for each destination node's shortest
> path. How can I represent and store them in a tree structure using
> python. Then I can easily find out what are the common nodes in the
> path to each destination.

A tree is just a connected acyclic rooted graph, so however you're
representing graphs should be a perfectly natural representation for
your shortest paths tree. In effect, you just treat the shortest
paths operation as an subgraph operation which only preserves the
edges that are part of a shortest path.

Geremy Condra



From venkatrajui at hotmail.com  Wed May 13 03:04:12 2009
From: venkatrajui at hotmail.com (Venkat Raju)
Date: Wed, 13 May 2009 12:34:12 +0530
Subject: Help needed to resolve ImportError
Message-ID: <BAY113-W36FB28C53C426C61D2A157A9610@phx.gbl>






Hi,
    We currently use VC6.0 and Python 2.2 for our project. 
 
As part of porting our project to VC2005 when i try to compile our application, it gives the following error
 
Traceback (most recent call last):
File "v:\Component\DS\scripts\messagebuilder\IL_Messagebuilder\test\test_IL_setget.py", line 20, in <module>
import IL_setget
File "\Component\DS\scripts\messagebuilder\IL_messagebuilder\IL_setget.py", line 22, in <module>
import IL_IEbuilder
File "\Component\DS\scripts\messagebuilder\IL_messagebuilder\IL_IEbuilder.py", line 11, in <module>
from MessageDictionary import *
File "\Component\LS\LSPythonFiles\MessageDictionary.py", line 3, in <module>
import ScriptInterpreter
ImportError: No module named ScriptInterpreter
 
 
 Basically, we are trying to import a VC compiled DLL into python script which generates another Python file. This issue doesnt occur in VC6.0 setup
 
I have tried setting path variables and options like copying scriptInterpreter.dll to python installation path and so on. HOwever it doesnt work.
 
Are there any compatibility issues between VC2005 and python 2.2? HOw can i resolve this.
 
Your help is highly appreciated.
 
Best Regards
Venkat
 
 
 
 


_________________________________________________________________
Drag n? drop?Get easy photo sharing with Windows Live? Photos.

http://www.microsoft.com/india/windows/windowslive/photos.aspx
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From henning.vonbargen at arcor.de  Wed May 13 03:18:54 2009
From: henning.vonbargen at arcor.de (henning.vonbargen at arcor.de)
Date: Wed, 13 May 2009 00:18:54 -0700 (PDT)
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
References: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>
Message-ID: <51d1dd3f-322d-47fa-9d44-75b92c6ef4e2@e20g2000vbc.googlegroups.com>

New info: The problem is not related to the specific program - it is
definitely a build problem, as the following test shows:
Python 2.6.2 (r262:71600, Apr 28 2009, 17:38:15)
[GCC 4.2.3] on hp-ux11
Type "help", "copyright", "credits" or "license" for more information.
>>> import threading
>>> threading._test()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.6/threading.py", line 952, in _test
    t.start()
  File "/usr/local/lib/python2.6/threading.py", line 471, in start
    _start_new_thread(self.__bootstrap, ())
thread.error: can't start new thread
>>>


The compiler I used was GCC 4.2.3


From prakash.stack at gmail.com  Wed May 13 03:40:25 2009
From: prakash.stack at gmail.com (prakash jp)
Date: Wed, 13 May 2009 13:10:25 +0530
Subject: python script as service
Message-ID: <805f59d50905130040t2b9dfaeaod2726b8ea41a4527@mail.gmail.com>

Hi all,

could any one tell how to run a python script as a scheduled service(say
every one minute). I tried out the windows registration

method but encountered an error . The error reads:

"The 'script name'  on local Computer started and then stopped. Some
services stop automatically if they have no work to do, for example, the
Performance Logs and Alerts service"

Regards
Prakash
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From jaime.frio at gmail.com  Wed May 13 04:19:13 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Wed, 13 May 2009 10:19:13 +0200
Subject: Representing a Tree in Python
In-Reply-To: <43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com>
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>
Message-ID: <97a8f1a70905130119r4f7d63b1g5183bb0a27c02d16@mail.gmail.com>

Dijkstra's algorithm computes shortest paths between a node and _ALL_
other nodes in the graph. It is usually stopped once computing the
shortest path to the target node is done, but that's simply for
efficiency, not a limitation of the algorithm. So you should be able
to tweak the code you are using so that it provides you with all you
are looking for. I'd be surprised if graphine (which, by the way,
looks great, CTO) or any other graph package didn't implement it, so
switching to that may be the most efficient thing to do.

On the other hand, if you want to post your code and links to the
Dijkstra code you are using it may be possible to help you with the
tweaking...

Jaime

On Wed, May 13, 2009 at 8:31 AM, godshorse <chinthakawk at gmail.com> wrote:
> On May 13, 11:54?am, CTO <debat... at gmail.com> wrote:
>> On May 13, 12:10?am, godshorse <chinthak... at gmail.com> wrote:
>>
>> > Hello,
>>
>> > I want to find out the shortest path tree from a root to several nodes
>> > in a graph data structure. I found a Dijkstra code from internet that
>> > finds shortest path between only two nodes. How can i extend it to a
>> > tree?. And what is the best way to represent a tree in Python?.
>>
>> > Thank you,
>>
>> Well, I'm biased, but I like <URL:http://graphine.org>.
>> As an example, to build a five node tree:
>>
>> >>> from graph.base import Graph
>> >>> g = Graph()
>> >>> for i in range(5):
>>
>> ... ? ? g.add_node(i)
>> ...
>>
>> >>> g.add_edge(0, 1)
>> >>> g.add_edge(0, 2)
>> >>> g.add_edge(1, 3)
>> >>> g.add_edge(1, 4)
>>
>> And to find the shortest path between, say, node 0 and node 4:
>>
>> >>> start = g[0]
>> >>> end = g[4]
>> >>> distance, edges = g.get_shortest_paths(start)[end]
>> >>> distance
>> 2
>> >>> edges
>>
>> [Edge(name=(0,1)), Edge(name=(1,4))]
>>
>> Let me know what you think if you decide to use it- I'm looking for
>> feedback.
>>
>> Geremy Condra
>
> Thanks very much for your reply Geremy. That site was interesting.
>
> Actually the Graph building part is already completed now. I used a
> dictionary for that and it works fine. for Dijkstra shortest path
> problem your suggestion can be used.
>
> But let me clear the my problem again. I have a graph. and I want to
> find 'shortest path tree' from a root node to several nodes. as a
> example if we have a graph of 5 nodes from 1 to 5, I need to build the
> shortest path tree from node 1 to nodes 2,3,5. So my question is
> instead of keeping separate lists for each destination node's shortest
> path. How can I represent and store them in a tree structure using
> python. Then I can easily find out what are the common nodes in the
> path to each destination.
>
> Thanks once again.
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From martin at librador.com  Wed May 13 04:44:11 2009
From: martin at librador.com (Martin Vilcans)
Date: Wed, 13 May 2009 10:44:11 +0200
Subject: Nimrod programming language
In-Reply-To: <043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>
References: <159308160@web.de>
	<mailman.29.1242119171.8015.python-list@python.org> 
	<043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>
Message-ID: <f782707a0905130144g130b5e4cw74e42b5dff54793a@mail.gmail.com>

On Tue, May 12, 2009 at 3:10 PM,  <rumpf_a at web.de> wrote:
>> You can certainly have a string type that uses byte arrays in UTF-8
>> encoding internally, but your string functions should be aware of that
>> and treat it as a unicode string. The len function and index operators
>> should count characters, not bytes. Add a byte array data type for
>> byte arrays instead.
>>
> It's not easy. I think Python3's byte arrays have an "upper" method
> (and a string literal syntax b"abc") which is quite alarming to me
> that they chose the wrong default.

I suppose that is to make it possible to use the 'bytes' data type for
text strings if you really want to (and for backwards-compatibility).
Default text strings should use Unicode (as in Python 3), and that
should be supported by the language.

> Eventually the "rope" data structure (that the compiler uses heavily)
> will become a proper part of the library: By "rope" I mean an
> immutable string implemented as a tree, so concatenation is O(1). For
> immutable strings there is no ``[]=`` operation, so using UTF-8 and
> converting it to a 32bit char works better.

Consider a string class that keeps track of its own encoding and can
change it on the fly as needed.

-- 
martin at librador.com
http://www.librador.com


From ldo at geek-central.gen.new_zealand  Wed May 13 04:44:27 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 13 May 2009 20:44:27 +1200
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz>
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
	<pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <gue19b$4no$1@lust.ihug.co.nz>

In message <pan.2009.05.12.09.35.36 at REMOVE.THIS.cybersource.com.au>, Steven 
D'Aprano wrote:

> On Tue, 12 May 2009 09:20:36 +0000, Steven D'Aprano wrote:
>
>> It seems pretty straightforward to me.
> 
> Except of course such a pattern won't work ...

I rest my case.



From chinthakawk at gmail.com  Wed May 13 04:49:23 2009
From: chinthakawk at gmail.com (godshorse)
Date: Wed, 13 May 2009 01:49:23 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com> 
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com> 
	<mailman.78.1242202760.8015.python-list@python.org>
Message-ID: <74fba814-bd05-4d4d-bf44-63750b2ef428@f1g2000prb.googlegroups.com>

On May 13, 3:19?pm, Jaime Fernandez del Rio <jaime.f... at gmail.com>
wrote:
> Dijkstra's algorithm computes shortest paths between a node and _ALL_
> other nodes in the graph. It is usually stopped once computing the
> shortest path to the target node is done, but that's simply for
> efficiency, not a limitation of the algorithm. So you should be able
> to tweak the code you are using so that it provides you with all you
> are looking for. I'd be surprised if graphine (which, by the way,
> looks great, CTO) or any other graph package didn't implement it, so
> switching to that may be the most efficient thing to do.
>
> On the other hand, if you want to post your code and links to the
> Dijkstra code you are using it may be possible to help you with the
> tweaking...
>
> Jaime
>
>
>
> On Wed, May 13, 2009 at 8:31 AM, godshorse <chinthak... at gmail.com> wrote:
> > On May 13, 11:54?am, CTO <debat... at gmail.com> wrote:
> >> On May 13, 12:10?am, godshorse <chinthak... at gmail.com> wrote:
>
> >> > Hello,
>
> >> > I want to find out the shortest path tree from a root to several nodes
> >> > in a graph data structure. I found a Dijkstra code from internet that
> >> > finds shortest path between only two nodes. How can i extend it to a
> >> > tree?. And what is the best way to represent a tree in Python?.
>
> >> > Thank you,
>
> >> Well, I'm biased, but I like <URL:http://graphine.org>.
> >> As an example, to build a five node tree:
>
> >> >>> from graph.base import Graph
> >> >>> g = Graph()
> >> >>> for i in range(5):
>
> >> ... ? ? g.add_node(i)
> >> ...
>
> >> >>> g.add_edge(0, 1)
> >> >>> g.add_edge(0, 2)
> >> >>> g.add_edge(1, 3)
> >> >>> g.add_edge(1, 4)
>
> >> And to find the shortest path between, say, node 0 and node 4:
>
> >> >>> start = g[0]
> >> >>> end = g[4]
> >> >>> distance, edges = g.get_shortest_paths(start)[end]
> >> >>> distance
> >> 2
> >> >>> edges
>
> >> [Edge(name=(0,1)), Edge(name=(1,4))]
>
> >> Let me know what you think if you decide to use it- I'm looking for
> >> feedback.
>
> >> Geremy Condra
>
> > Thanks very much for your reply Geremy. That site was interesting.
>
> > Actually the Graph building part is already completed now. I used a
> > dictionary for that and it works fine. for Dijkstra shortest path
> > problem your suggestion can be used.
>
> > But let me clear the my problem again. I have a graph. and I want to
> > find 'shortest path tree' from a root node to several nodes. as a
> > example if we have a graph of 5 nodes from 1 to 5, I need to build the
> > shortest path tree from node 1 to nodes 2,3,5. So my question is
> > instead of keeping separate lists for each destination node's shortest
> > path. How can I represent and store them in a tree structure using
> > python. Then I can easily find out what are the common nodes in the
> > path to each destination.
>
> > Thanks once again.
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> --
> (\__/)
> ( O.o)
> ( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
> planes de dominaci?n mundial.

Hello Jaime,

Thanks for the reply.

This is the link to the code that I am using. http://code.activestate.com/recipes/119466/
What I do in my code is just looping through the destination nodes and
find the shortest path to each node.

Thanks


From bvrkchowdary at yahoo.co.in  Wed May 13 04:55:51 2009
From: bvrkchowdary at yahoo.co.in (VenkataRamaKrishna Boddu)
Date: Wed, 13 May 2009 14:25:51 +0530 (IST)
Subject: Proposal to Add New Method to List Object: Mutable Sequence Types
Message-ID: <926641.66419.qm@web8408.mail.in.yahoo.com>

Hi All,

This is my first mail to python-list.

I just want to propose the idea of introducing a new method for the List Object in similar lines of Dictionary Object has_key method.

See my below code, It always produces the ValueError, if I want to check whether an item is present or not, then they is no method in the List Object (do a "dir(list)").

So., Is it not good, to have a method in List Object, may be something like has_item to check whether a item is present or not?

#============== CODE ==============================
partsOfMyName = ['Python', 'Perl', 'PHP', 'MySQL'];
## strSearchKey = 'Perl';
strSearchKey = 'Prl';

indexofKey = partsOfMyName.index(strSearchKey);
print 'Index of search key: %s:  %d'%(strSearchKey, indexofKey);

Thanks
Venkata Rama Krishna Boddu


      Explore and discover exciting holidays and getaways with Yahoo! India Travel http://in.travel.yahoo.com/
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From CinnamonDonkey at googlemail.com  Wed May 13 05:20:46 2009
From: CinnamonDonkey at googlemail.com (CinnamonDonkey)
Date: Wed, 13 May 2009 02:20:46 -0700 (PDT)
Subject: (Winows) Finding out which process has locked a file.
Message-ID: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>

Hi all,

Does anyone know how I can programatically find out which process
(resolved to human friendly string, i.e. executable) has a lock on a
file.

I have a script running which occassionally fails because it is trying
to delete a file in use by another process. When this happens I want
it to log which process has the lock.

Since it tends to happen when I am never near the computer to catch
it! :(

Cheers,
Shaun


From drobinow at gmail.com  Wed May 13 05:21:49 2009
From: drobinow at gmail.com (David Robinow)
Date: Wed, 13 May 2009 05:21:49 -0400
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <cb3e2b24-d52f-46b0-9d5d-72564ae44833@a5g2000pre.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.64.1242173699.8015.python-list@python.org>
	<cb3e2b24-d52f-46b0-9d5d-72564ae44833@a5g2000pre.googlegroups.com>
Message-ID: <4eb0089f0905130221x12e6306dvbfe449e5b67e4d12@mail.gmail.com>

On Tue, May 12, 2009 at 11:47 PM, walterbyrd <walterbyrd at iname.com> wrote:
> On May 12, 6:15?pm, norseman <norse... at hughes.net> wrote:
>
>> Subject line says UNIX to DOS
>>
>> I hope that means you are using a UNIX machine.
>>
>
> I should have mentioned, I am working in an environment that is very
> restrictive about what I can put on my XP desktop. I can not put
> python, or even notepad++, on my desktop. But, I do have cygwin.
>
> As you probably know, cygwin formats to UNIX.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

cygwin has u2d and d2u


From david.lyon at preisshare.net  Wed May 13 05:56:48 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Wed, 13 May 2009 05:56:48 -0400
Subject: python script as service
In-Reply-To: <805f59d50905130040t2b9dfaeaod2726b8ea41a4527@mail.gmail.com>
References: <805f59d50905130040t2b9dfaeaod2726b8ea41a4527@mail.gmail.com>
Message-ID: <8740f3eaf1383dfff79817c8bd38dd8d@preisshare.net>


On XP, go to Start Menu/All Programs/Accessories/System Tools/Scheduled
Tasks

Add your program in with the scheduled task wizard...

On Wed, 13 May 2009 13:10:25 +0530, prakash jp <prakash.stack at gmail.com>
wrote:
> Hi all,
> 
> could any one tell how to run a python script as a scheduled service(say
> every one minute). I tried out the windows registration
> 
> method but encountered an error . The error reads:
> 
> "The 'script name'  on local Computer started and then stopped. Some
> services stop automatically if they have no work to do, for example, the
> Performance Logs and Alerts service"
> 
> Regards
> Prakash


From daved170 at gmail.com  Wed May 13 06:00:41 2009
From: daved170 at gmail.com (daved170)
Date: Wed, 13 May 2009 03:00:41 -0700 (PDT)
Subject: PythonCard - My app stuck when button clicked
Message-ID: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>

Hi there,
I'm newbie in pythonCard.
I have an application with 2 buttons : START , STOP
Start execute a while(1) loop that execute my calculations.
Stop suppose to raise a flag that will end that loop.

Whenever I pish the START button my GUI is stuck. the calculation
executes but I can't push the STOP button.

I added thread that START start a thread that execute my calculations.
I also added a Global variable that will hold the indication if the
loop should continue.
The problem now is that the thread ignore that variable and loop
forever.

Is there a simple way to make sure that the GUI won't stuck (without
threads)?
And if there isn't such way I would appriciet it very much if anyone
could post an example of how to make my thread read that variable
Thanks
Dave


From shailja.gulati at tcs.com  Wed May 13 06:58:54 2009
From: shailja.gulati at tcs.com (Shailja Gulati)
Date: Wed, 13 May 2009 16:28:54 +0530
Subject: about Python doc reader
Message-ID: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>

Hi ,

I am currently working on "Information retrieval from semi structured 
Documents" in which there is a need to read data from Resumes.

Could anyone tell me is there any python API to read Word doc?


Thanks and regards,
Shailja

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From theller at python.net  Wed May 13 07:51:33 2009
From: theller at python.net (Thomas Heller)
Date: Wed, 13 May 2009 13:51:33 +0200
Subject: json vs. simplejson
Message-ID: <76vqi5F1eq4rjU1@mid.individual.net>

Python 2.6 contains the json module, which I thought was the renamed (and improved?)
simplejson module that also works on older Python versions.

However, it seems the json is a lot slower than simplejson.
This little test, run on Python 2.6.2 and WinXP shows a dramatic difference:

  C:\>py26 -m timeit -s "from json import dumps, loads" "loads(dumps(range(32)))"
  1000 loops, best of 3: 618 usec per loop

  C:\>py26 -m timeit -s "from simplejson import dumps, loads" "loads(dumps(range(32)))"
  10000 loops, best of 3: 31 usec per loop

Does anyone have an explanation for that?

Thanks,
Thomas


From theller at python.net  Wed May 13 07:54:49 2009
From: theller at python.net (Thomas Heller)
Date: Wed, 13 May 2009 13:54:49 +0200
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <mailman.70.1242188517.8015.python-list@python.org>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>	<mailman.22.1242108050.8015.python-list@python.org>	<02oOl.710$wR5.489@nwrddc02.gnilink.net>	<mailman.65.1242174135.8015.python-list@python.org>	<4a0a3f40$0$24009$9b622d9e@news.freenet.de>
	<mailman.70.1242188517.8015.python-list@python.org>
Message-ID: <76vqo9F1eq4rjU2@mid.individual.net>

David Lyon schrieb:
> On Wed, 13 May 2009 05:32:16 +0200, "Martin v. L?wis" <martin at v.loewis.de>
> wrote:
>  
>> I think this was a case of obscure misconfiguration of the system.
>> It is always possible to configure a system in such a way that even
>> the most resilient installation procedure will break.
> 
> Technically, you are right..
> 
> but imho.. windows installers are overkill and shouldn't be used
> for this sort of thing. That is, installing libraries. And not
> the fault of the package authors either...

Well, if you don't like the windows installer than you can always
install from the sources.  Please go ahead and try it out.

Thomas


From deets at nospam.web.de  Wed May 13 08:02:53 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 13 May 2009 14:02:53 +0200
Subject: json vs. simplejson
References: <76vqi5F1eq4rjU1@mid.individual.net>
Message-ID: <76vr3uF1ejv91U1@mid.uni-berlin.de>

Thomas Heller wrote:

> Python 2.6 contains the json module, which I thought was the renamed (and
> improved?) simplejson module that also works on older Python versions.
> 
> However, it seems the json is a lot slower than simplejson.
> This little test, run on Python 2.6.2 and WinXP shows a dramatic
> difference:
> 
>   C:\>py26 -m timeit -s "from json import dumps, loads"
>   "loads(dumps(range(32)))" 1000 loops, best of 3: 618 usec per loop
> 
>   C:\>py26 -m timeit -s "from simplejson import dumps, loads"
>   "loads(dumps(range(32)))" 10000 loops, best of 3: 31 usec per loop
> 
> Does anyone have an explanation for that?

Dunno about json, but simplejson comes with an (optional) C-based
speedup-module.

Maybe this isn't part of the standard distribution? 

Diez


From bearophileHUGS at lycos.com  Wed May 13 08:19:58 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Wed, 13 May 2009 05:19:58 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com> 
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>
Message-ID: <98ea5010-2eab-43de-b5a2-d4f79a06f25e@z19g2000vbz.googlegroups.com>

godshorse, you may use the "shortestPaths" method of this graph class
of mine:
http://sourceforge.net/projects/pynetwork/

(It uses the same Dijkstra code by Eppstein).
(Once you have all distances from a node to the other ones, it's not
too much difficult to find the tree you talk about).

Also see the Minimum spanning tree:
http://en.wikipedia.org/wiki/Minimum_spanning_tree

Bye,
bearophile


From theller at python.net  Wed May 13 08:21:17 2009
From: theller at python.net (Thomas Heller)
Date: Wed, 13 May 2009 14:21:17 +0200
Subject: json vs. simplejson
In-Reply-To: <76vr3uF1ejv91U1@mid.uni-berlin.de>
References: <76vqi5F1eq4rjU1@mid.individual.net>
	<76vr3uF1ejv91U1@mid.uni-berlin.de>
Message-ID: <76vs9tF1f6c58U1@mid.individual.net>

Diez B. Roggisch schrieb:
> Thomas Heller wrote:
> 
>> Python 2.6 contains the json module, which I thought was the renamed (and
>> improved?) simplejson module that also works on older Python versions.
>> 
>> However, it seems the json is a lot slower than simplejson.
>> This little test, run on Python 2.6.2 and WinXP shows a dramatic
>> difference:
>> 
>>   C:\>py26 -m timeit -s "from json import dumps, loads"
>>   "loads(dumps(range(32)))" 1000 loops, best of 3: 618 usec per loop
>> 
>>   C:\>py26 -m timeit -s "from simplejson import dumps, loads"
>>   "loads(dumps(range(32)))" 10000 loops, best of 3: 31 usec per loop
>> 
>> Does anyone have an explanation for that?
> 
> Dunno about json, but simplejson comes with an (optional) C-based
> speedup-module.
> 
> Maybe this isn't part of the standard distribution? 


json has it's own _json speedup module.  And funny, on Linux, json
WITH _json is still somewhat slower (~10%) than simplejson WITHOUT
the _speedups module.

Thomas


From kushal.kumaran at gmail.com  Wed May 13 08:37:45 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Wed, 13 May 2009 18:07:45 +0530
Subject: about Python doc reader
In-Reply-To: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>
Message-ID: <1e364c4e0905130537u472cf2c8v24ab3eb725e8199d@mail.gmail.com>

On Wed, May 13, 2009 at 4:28 PM, Shailja Gulati <shailja.gulati at tcs.com> wrote:
>
> Hi ,
>
> I am currently working on "Information retrieval from semi structured
> Documents" in which there is a need to read data from Resumes.
>
> Could anyone tell me is there any python API to read Word doc?
>

If you're using Windows, you can use COM APIs to read Word documents.
Or you can use OpenOffice.org using uno.  You can find examples of
either by googling.

-- 
kushal


From davea at dejaviewphoto.com  Wed May 13 08:56:56 2009
From: davea at dejaviewphoto.com (Dave Angel)
Date: Wed, 13 May 2009 08:56:56 -0400
Subject: Updates to enviironment variables and ctypes
In-Reply-To: <cb4d391b0905122310y35c1090l666aa037789e5bff@mail.gmail.com>
References: <cb4d391b0905122310y35c1090l666aa037789e5bff@mail.gmail.com>
Message-ID: <4A0AC398.8080405@dejaviewphoto.com>

Scott Flynn wrote:
> I was hoping I could update LD_LIBRARY_PATH at runtime and load a library
> through ctypes from there, but I haven't been able to.
>
> I've tried all of these.
>
> os.environ['LD_LIBRARY_PATH'] = "./lib"
> os.putenv('LD_LIBRARY_PATH', "./lib")
> os.system("export LD_LIBRARY_PATH=./lib")
> lib = CDLL("libevaluator.so")
>
> Traceback (most recent call last):
>   File "Evaluator.py", line 9, in <module>
>     lib = CDLL("libevaluator.so")
>   File "/usr/lib/python2.5/ctypes/__init__.py", line 348, in __init__
>     self._handle = _dlopen(self._name, mode)
> OSError: libevaluator.so: cannot open shared object file: No such file or
> directory
>
> The only thing that works is to set the variable before starting Python. I'm
> assuming that's just how it's going to be. Is this a bug or is it meant to
> be?
>
>   
(You should mention that you're using Unix, and probably what version of 
Python you're using.  It might make a difference.)

Doesn't ctypes.LoadLibrary() accept a pathname as argument?  That's what 
the Python 2.6 docs say.  I haven't experimented, but it'd be worth a 
try.  In this case, I'd make it an absolute path, just to convince it 
not to look through the directories in the LD_LIBRARY_PATH.



From svarovsky.tomas at gmail.com  Wed May 13 08:57:47 2009
From: svarovsky.tomas at gmail.com (Tomas Svarovsky)
Date: Wed, 13 May 2009 05:57:47 -0700 (PDT)
Subject: urllib2 slow for multiple requests
Message-ID: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>

Hello everybody, really new to python, so bear with me. I am trying to
do some very basic scraping tool. Bascally it just grabs a page xy
times and tells me how long it took. When I do this once, it is
blazingly fast, but when I increase the number of repetitions, it is
slowing down considerably (1 is like 3 ms, 100 takes 6 seconds). I
have done implementations in couple more languages (php, ruby) and
none of them seems to suffer from a similar problem and it seems, that
it behaves linearly. Maybe it is a known issue in urllib2, or I am
simply using it badly. I am using python 2.4.3, machine has CentOS,
below is the sc. Thanks in advance

import urllib2
from datetime import datetime

def application():
    start = datetime.now()
    req = urllib2.Request("http://127.0.0.1/gdc/about", None,
{'Accept': 'application/json'})
    for number in range(100):
      response = urllib2.urlopen(req)
    end = datetime.now()
    output = end - start
    print output

application()


From mail at timgolden.me.uk  Wed May 13 09:01:59 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 13 May 2009 14:01:59 +0100
Subject: about Python doc reader
In-Reply-To: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>
Message-ID: <4A0AC4C7.1060000@timgolden.me.uk>

Shailja Gulati wrote:
> Hi ,
> 
> I am currently working on "Information retrieval from semi structured 
> Documents" in which there is a need to read data from Resumes.
> 
> Could anyone tell me is there any python API to read Word doc?

If you haven't already, get hold of the pywin32 extensions:

  http://pywin32.sf.net

<code>
import win32com.client

doc = win32com.client.GetObject ("c:/temp/temp.doc")
text = doc.Range ().Text

</code>

Note that this will give you a unicode object with \r line-delimiters.
You could read para by para if that were more useful:

<code>
import win32com.client

doc = win32com.client.GetObject ("c:/temp/temp.doc")
lines = [p.Range () for p in doc.Paragraphs]

</code>

TJG


From david.lyon at preisshare.net  Wed May 13 09:05:38 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Wed, 13 May 2009 09:05:38 -0400
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <76vqo9F1eq4rjU2@mid.individual.net>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>	<mailman.22.1242108050.8015.python-list@python.org>	<02oOl.710$wR5.489@nwrddc02.gnilink.net>	<mailman.65.1242174135.8015.python-list@python.org>	<4a0a3f40$0$24009$9b622d9e@news.freenet.de>
	<mailman.70.1242188517.8015.python-list@python.org>
	<76vqo9F1eq4rjU2@mid.individual.net>
Message-ID: <9211c720176a0ad4e161b3c0be52d80c@preisshare.net>

On Wed, 13 May 2009 13:54:49 +0200, Thomas Heller <theller at python.net>

> 
> Well, if you don't like the windows installer than you can always
> install from the sources.  Please go ahead and try it out.

Thanks for the offer... 

but aren't python .eggs supposed to remove the need for doing that ?

Regards

David


From emile at fenx.com  Wed May 13 10:05:30 2009
From: emile at fenx.com (Emile van Sebille)
Date: Wed, 13 May 2009 07:05:30 -0700
Subject: (Winows) Finding out which process has locked a file.
In-Reply-To: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
Message-ID: <guek3e$co3$1@ger.gmane.org>

On 5/13/2009 2:20 AM CinnamonDonkey said...
> Hi all,
> 
> Does anyone know how I can programatically find out which process
> (resolved to human friendly string, i.e. executable) has a lock on a
> file.
> 
> I have a script running which occassionally fails because it is trying
> to delete a file in use by another process. When this happens I want
> it to log which process has the lock.
> 

You might take a look at http://ccollomb.free.fr/unlocker/ -- I've not 
used the command line options although they are available...

Emile




From mail at timgolden.me.uk  Wed May 13 10:21:09 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 13 May 2009 15:21:09 +0100
Subject: (Winows) Finding out which process has locked a file.
In-Reply-To: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
Message-ID: <4A0AD755.3060306@timgolden.me.uk>

CinnamonDonkey wrote:
> Hi all,
> 
> Does anyone know how I can programatically find out which process
> (resolved to human friendly string, i.e. executable) has a lock on a
> file.
> 
> I have a script running which occassionally fails because it is trying
> to delete a file in use by another process. When this happens I want
> it to log which process has the lock.
> 
> Since it tends to happen when I am never near the computer to catch
> it! :(


Usual place to look for these things is sysinternals (now part of
Microsoft). In particular, the handle util:

  http://technet.microsoft.com/en-us/sysinternals/bb896655.aspx

To get the same programatically you have to delve quite deep
into the NT low-level API. Not tried it myself.

TJG


From aahz at pythoncraft.com  Wed May 13 10:25:05 2009
From: aahz at pythoncraft.com (Aahz)
Date: 13 May 2009 07:25:05 -0700
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
References: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>
	<51d1dd3f-322d-47fa-9d44-75b92c6ef4e2@e20g2000vbc.googlegroups.com>
Message-ID: <guel81$roq$1@panix3.panix.com>

In article <51d1dd3f-322d-47fa-9d44-75b92c6ef4e2 at e20g2000vbc.googlegroups.com>,
 <henning.vonbargen at arcor.de> wrote:
>
>New info: The problem is not related to the specific program - it is
>definitely a build problem, as the following test shows:
>Python 2.6.2 (r262:71600, Apr 28 2009, 17:38:15)
>[GCC 4.2.3] on hp-ux11
>Type "help", "copyright", "credits" or "license" for more information.
>>>> import threading
>>>> threading._test()
>Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File "/usr/local/lib/python2.6/threading.py", line 952, in _test
>    t.start()
>  File "/usr/local/lib/python2.6/threading.py", line 471, in start
>    _start_new_thread(self.__bootstrap, ())
>thread.error: can't start new thread
>>>>
>
>The compiler I used was GCC 4.2.3

You probably want to start by figuring out which threading library is
being used -- Python normally wants Posix threads, but IIRC, that's not
the default on HP-UX, and you may need to fix the build process to use
Posix.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From walterbyrd at iname.com  Wed May 13 10:32:06 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Wed, 13 May 2009 07:32:06 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.64.1242173699.8015.python-list@python.org>
	<cb3e2b24-d52f-46b0-9d5d-72564ae44833@a5g2000pre.googlegroups.com>
	<mailman.80.1242206512.8015.python-list@python.org>
Message-ID: <55d9aae7-c274-4181-8036-35c965908fc1@x31g2000prc.googlegroups.com>

On May 13, 3:21?am, David Robinow <drobi... at gmail.com> wrote:
> cygwin has u2d and d2u- Hide quoted text -

Thank you, I did not know about those utilities, until now.




From agaskins_ng at kelleramerica.com  Wed May 13 10:40:18 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Wed, 13 May 2009 10:40:18 -0400
Subject: PythonCard - My app stuck when button clicked
References: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>
Message-ID: <qZAOl.57208$vj3.30528@newsfe01.iad>

I second this.

I am very interested in PyCard having just discovered it in your message 
here. I know I'll run in to this same problem in my application that will 
run test routines that must have a mechanism to abort.

Sorry for the lack of any help here...

-Adam

"daved170" <daved170 at gmail.com> wrote in message 
news:e7a3e095-974f-4239-8812-44f304f5fb37 at n21g2000vba.googlegroups.com...
> Hi there,
> I'm newbie in pythonCard.
> I have an application with 2 buttons : START , STOP
> Start execute a while(1) loop that execute my calculations.
> Stop suppose to raise a flag that will end that loop. 




From cgoldberg at gmail.com  Wed May 13 10:55:02 2009
From: cgoldberg at gmail.com (cgoldberg)
Date: Wed, 13 May 2009 07:55:02 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
Message-ID: <9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com>

> Bascally it just grabs a page xy
> times and tells me how long it took.

you aren't doing a read(), so technically you are just connecting to
the web server and sending the request but never reading the content
back from the socket.  So your timing wouldn't be accurate.

try this instead:
response = urllib2.urlopen(req).read()

But that is not the problem you are describing...


> when I increase the number of repetitions, it is
> slowing down considerably (1 is like 3 ms, 100 takes 6 seconds).
> Maybe it is a known issue in urllib2

I ran your code and can not reproduce that behavior.  No matter how
many repetitions, I still get a similar response time per transaction.

any more details or code samples you can provide?

-Corey Goldberg


From MadHatter7 at myself.com  Wed May 13 11:00:01 2009
From: MadHatter7 at myself.com (MadHatter7 at myself.com)
Date: Wed, 13 May 2009 08:00:01 -0700 (PDT)
Subject: spam
References: <c59adc81-4af9-4a67-9428-7feecf32b836@j9g2000prh.googlegroups.com>
Message-ID: <6174e712-c008-410f-a730-2a59cd1506e8@b6g2000pre.googlegroups.com>

spam


From showell30 at yahoo.com  Wed May 13 11:26:38 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Wed, 13 May 2009 08:26:38 -0700 (PDT)
Subject: Call Web Service using proxy and http authentication
References: <3ebae673-2579-4589-b57a-2330c5fe9f3c@j12g2000vbl.googlegroups.com>
	<f8e3d564-b19f-4767-b4cb-b7dfcb86ecca@j18g2000prm.googlegroups.com> 
	<ebab040f-f2e4-4387-8da6-d568b865785a@o27g2000vbd.googlegroups.com>
Message-ID: <f17ad6fe-866d-4dbc-bca7-2ed8a8d39bee@v35g2000pro.googlegroups.com>

On May 12, 12:51?pm, wdveloper <tot... at gmail.com> wrote:
> On May 12, 8:38?pm, Steve Howell <showel... at yahoo.com> wrote:
>
>
>
> > On May 12, 8:59?am, wdveloper <tot... at gmail.com> wrote:
>
> > > Hi everyone,
>
> > > I am trying to call a webservice which requires an http
> > > authentication.
> > > To reach the ws, I must pass from a proxy http. So in the whole I need
> > > go through two authentications before getting the ws working. I am
> > > using SOAPpy and I'm getting quite crazy.
> > > I am able to arrange this problem with simple http calls using urllib2
> > > but for the ws i dont see any way out.
>
> > > Does anyone knows how I can manage this stuff? Is there any better
> > > solution or example code?
>
> > Your high level description of the problem is good, but I think you'll
> > get more help if you provide a little more detail.
>
> > For something like this you may want to try to do more at the HTTP
> > level, where you have a little more control over the authentication,
> > and then find a way to hook into SOAPpy just to build and parse the
> > payloads.
>
> > How good is your understanding of HTTP? ?Do you know the basics of how
> > headers work? ?You might want to brush up a little on HTTP just to
> > help understand what's going on; it will almost certainly be valuable
> > for future projects as well.
>
> > To understand how the proxy works in particular, if you can use the
> > proxy to access a normal html-serving website, you can use the "Live
> > HTTP Headers" tool under Firefox to see what's going on.
>
> > But before all that, I would maybe just post a little more detail on
> > the problem. ?Maybe show code you've written so far, and any error
> > messages/tracebacks, to better indicate where you are stuck.
>
> Thank you very much Steve,
>
> I do have a good understanding of http and its headers rules, and of
> course I can work on that.
> On the other hand, I am new to python and SOAPpy toolkit and I dont
> have much of an experience working with ws in general.
>
> When it comes of working with simple call to WS, everything is
> successfull; problems start cause I dont know how to use the toolkit
> to compose the http request. I should code it in the way that it
> connects to my proper proxy and it gets authenticated in the server
> exposing the service.
>
> What I have is something like:
> from SOAPpy import WSDL
>
> wsdl = 'http://myws?wsdl'
> my_http_proxy = '10.x.x.x:8080'
> proxy = WSDL.Proxy(wsdl, http_proxy=my_http_proxy)
> res = proxy.myService( myparam='...' )
>
> What I get is that connection reaches timeout since the server doesnt
> see me coming from the right proxy.
> First problem, I can't see where I can put my proxy authentication
> username and password.
> Second, when I will be able to pass through the right proxy, I need to
> authenticate on the server via http through my credential.
>


Have you looked at the URLopener class?


From moradks at gmail.com  Wed May 13 11:53:20 2009
From: moradks at gmail.com (Morad)
Date: Wed, 13 May 2009 08:53:20 -0700 (PDT)
Subject: Can't run PyQt apps with MacPython
Message-ID: <25cdb69b-689c-4cfe-a378-3016b3d50e50@s21g2000vbb.googlegroups.com>

I recently got a new MacBook Pro with Leopard, and would like to
develop using Python and PyQt. I installed the latest Qt SDK, updated
MacPython to V 2.5.4 and then proceeded to install SIP and PyQt as
described in Mark Summerfield's book on PyQt Programming. Everything
went fine and none of the scripts complained. However when I want to
run a demo app, I get the error message "Fatal Python error:
Interpreter not initialized (version mismatch?) / Abort Trap". Anybody
can help?


From manu3d at gmail.com  Wed May 13 12:08:13 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Wed, 13 May 2009 09:08:13 -0700 (PDT)
Subject: DOM implementation
Message-ID: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>

Hi everybody,

I just spent the past hour or so trying to have a better understanding
of how the various DOM-supporting libraries (xml.dom, xml.dom.minidom)
work. I've used etree and lxml successfully before but I wanted to
understand how close I can get to the W3C DOM standards. Ok, I  think
more or less I got it all. A few questions emerged:

1) classes in xml.dom.minidom (i.e. Element) seem to be old style
classes. Is there a good reason they are kept that way or simply
nobody had the time/will to update the library to use new-style
classes?

2) for a lightweight implementation xml.dom.minidom comes with a lot
of methods that aren't part of the W3C standards. I'm referring to
toxml, toprettyxml, writxml and the _get_* family. Would it be better
if there was a package offering W3C-faithful classes only, on top of
which convenience and compatibility methods are added by another
package (or two!) through subclassing?

Manu


From bvidinli at gmail.com  Wed May 13 12:12:56 2009
From: bvidinli at gmail.com (bvidinli)
Date: Wed, 13 May 2009 19:12:56 +0300
Subject: php to python code converter
In-Reply-To: <1ca12653-4c28-48f1-bf17-def74a89ef15@h23g2000vbc.googlegroups.com>
References: <mailman.5292.1241795959.11746.python-list@python.org> 
	<1ca12653-4c28-48f1-bf17-def74a89ef15@h23g2000vbc.googlegroups.com>
Message-ID: <36e8a7020905130912o164b8cb5t6e129a5513bb054b@mail.gmail.com>

i designed php to python converter a few monthos ago, to translate
some of my ready made code snippets to python.
i was experienced with php and was  learning  python.

as stated on project home, it is only intended for translating small
code snippets or small functions to python.

whole applications, cannot be converted using that...

only an idea, a very beta/alpha package,

since there are huge amount of php applications, files, codes all
around web, this would be a good tool if developed and used
properly...


From wells at submute.net  Wed May 13 12:14:05 2009
From: wells at submute.net (Wells)
Date: Wed, 13 May 2009 09:14:05 -0700 (PDT)
Subject: n00b question: Possible to pass lists to a Template class?
Message-ID: <cc34bfbc-e6a8-47ed-af95-adf0d42cf9e2@t11g2000vbc.googlegroups.com>

Is it possible to pass a list to the Template.substitute method and
use that in the template, like so..

g = string.Template(gametemplate)
print g.substitute(recap = "none", winner = game["winner"], loser =
game["loser"])

Then in the template...

<b>winner.team

Where winner.team would be the value of game["winner"]["team"].

Thanks!


From wells at submute.net  Wed May 13 12:22:32 2009
From: wells at submute.net (Wells)
Date: Wed, 13 May 2009 09:22:32 -0700 (PDT)
Subject: n00b question: Possible to pass lists to a Template class?
References: <cc34bfbc-e6a8-47ed-af95-adf0d42cf9e2@t11g2000vbc.googlegroups.com>
Message-ID: <5cdc08d7-c9d9-415d-9ae8-5a67cd94dbc4@s28g2000vbp.googlegroups.com>

On May 13, 11:14?am, Wells <we... at submute.net> wrote:
> Is it possible to pass a list to the Template.substitute method and
> use that in the template, like so..
>
> g = string.Template(gametemplate)
> print g.substitute(recap = "none", winner = game["winner"], loser =
> game["loser"])
>
> Then in the template...
>
> <b>winner.team
>
> Where winner.team would be the value of game["winner"]["team"].
>
> Thanks!

Sorry, I meant dicts, not lists. Like I said, n00b question.


From davea at ieee.org  Wed May 13 12:23:15 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 13 May 2009 12:23:15 -0400
Subject: (Winows) Finding out which process has locked a file.
In-Reply-To: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
Message-ID: <4A0AF3F3.1000305@ieee.org>



CinnamonDonkey wrote:
> Hi all,
>
> Does anyone know how I can programatically find out which process
> (resolved to human friendly string, i.e. executable) has a lock on a
> file.
>
> I have a script running which occassionally fails because it is trying
> to delete a file in use by another process. When this happens I want
> it to log which process has the lock.
>
> Since it tends to happen when I am never near the computer to catch
> it! :(
>
> Cheers,
> Shaun
>
>
>   
This may depend on what version of Windows you're using, as the API's 
changed in Windows 2000, and again in XP SP2, and probably again in Vista.

I don't know an API for what you want, but filemon, from 
http://technet.microsoft.com/en-us/sysinternals/bb896642.aspx
can build a log of file activity, which you can examine later.


If you do find an API that works on XP and better, please let us know.  
Even if you only know a function name, I'd be willing to play with it 
some, to see what it might do.  I'd like to find out, and would share 
what I did figure out.




From paul at boddie.org.uk  Wed May 13 12:29:40 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Wed, 13 May 2009 09:29:40 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
Message-ID: <fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com>

On 13 Mai, 18:08, "Emanuele D'Arrigo" <man... at gmail.com> wrote:
>
> I just spent the past hour or so trying to have a better understanding
> of how the various DOM-supporting libraries (xml.dom, xml.dom.minidom)
> work. I've used etree and lxml successfully before but I wanted to
> understand how close I can get to the W3C DOM standards.

You might want to look at pxdom if you want a high level of compliance
with W3C DOM standards:

http://www.doxdesk.com/software/py/pxdom.html

> Ok, I ?think more or less I got it all. A few questions emerged:
>
> 1) classes in xml.dom.minidom (i.e. Element) seem to be old style
> classes. Is there a good reason they are kept that way or simply
> nobody had the time/will to update the library to use new-style
> classes?

I imagine that no-one bothered to update the code. The built-in
modules like minidom do get maintenance, but not much further
development. (PyXML, which seemed to accumulate code from 4Suite,
possibly contributed code to the standard library, but it doesn't seem
to be actively maintained or developed any more.)

> 2) for a lightweight implementation xml.dom.minidom comes with a lot
> of methods that aren't part of the W3C standards. I'm referring to
> toxml, toprettyxml, writxml and the _get_* family. Would it be better
> if there was a package offering W3C-faithful classes only, on top of
> which convenience and compatibility methods are added by another
> package (or two!) through subclassing?

Those methods probably don't add that much weight, considering the
weight that the W3C facilities already necessitate. I attempted to
make a somewhat W3C-compliant implementation with the libxml2dom
package (http://pypi.python.org/pypi/libxml2dom), although I felt that
providing PyXML-like conveniences (similar to those you describe) was
beneficial: some of the W3C APIs for parsing and serialisation are
baroque, and although I've tried to implement some of those, too, I
feel that it isn't a good use of my time.

Paul


From suruti94 at gmail.com  Wed May 13 12:40:13 2009
From: suruti94 at gmail.com (Mohan Parthasarathy)
Date: Wed, 13 May 2009 09:40:13 -0700
Subject: How to see the code definiton in the shell ?
Message-ID: <89dd3da60905130940l2f3560afx2a7751a354223afc@mail.gmail.com>

Hi,

I am new to Python. I tried searching this but could not find an answer. In
the interactive shell, I write a new function and I want to be able to see
all the code that I wrote at a later time. Just typing the function name
only shows

>>> allmethods
<function allmethods at 0x822b0>

How do I see the actual code ?

thanks
mohan
-------------- next part --------------
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From matiassurdi at gmail.com  Wed May 13 13:00:01 2009
From: matiassurdi at gmail.com (Matias Surdi)
Date: Wed, 13 May 2009 19:00:01 +0200
Subject: How to see the code definiton in the shell ?
In-Reply-To: <89dd3da60905130940l2f3560afx2a7751a354223afc@mail.gmail.com>
References: <89dd3da60905130940l2f3560afx2a7751a354223afc@mail.gmail.com>
Message-ID: <gueuag$jpq$1@ger.gmane.org>

Mohan Parthasarathy escribi?:
> Hi,
> 
> I am new to Python. I tried searching this but could not find an answer. 
> In the interactive shell, I write a new function and I want to be able 
> to see all the code that I wrote at a later time. Just typing the 
> function name only shows
> 
>  >>> allmethods
> <function allmethods at 0x822b0>
> 
> How do I see the actual code ?
> 
> thanks
> mohan
> 


I think that is not possible (at least, not with the default python 
console and without doing introspection).

Anyway, why you need to do that? Why not write down the script in a text 
file and run it?

If you need to "run a console" inside a function so that you can inspect 
variables, maybe you can use:

import pdb;pdb.set_trace()

And that will start a debug session when gets executed.


Hope that helps.




From jcd at sdf.lonestar.org  Wed May 13 13:26:18 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Wed, 13 May 2009 13:26:18 -0400
Subject: How to see the code definiton in the shell ?
In-Reply-To: <89dd3da60905130940l2f3560afx2a7751a354223afc@mail.gmail.com>
References: <89dd3da60905130940l2f3560afx2a7751a354223afc@mail.gmail.com>
Message-ID: <1242235578.4400.54.camel@aalcdl07>

On Wed, 2009-05-13 at 09:40 -0700, Mohan Parthasarathy wrote:
> Hi,
> 
> I am new to Python. I tried searching this but could not find an
> answer. In the interactive shell, I write a new function and I want to
> be able to see all the code that I wrote at a later time. Just typing
> the function name only shows 
> 
> >>> allmethods
> <function allmethods at 0x822b0>
> 
> How do I see the actual code ?
> 
> thanks
> mohan
> 

The function definition itself has been compiled down to bytecode.  You
can see the bytecode as follows:

>>> def one():
...     return 1
...
>>> print one.func_code.co_code  # not very readable
'd\x01\x00S'
>>> import dis # python disassembler
>>> dis.dis(one.func_code.co_code)
          0 LOAD_CONST          1 (1)
          3 RETURN_VALUE   

or just run dis.dis on the function itself

>>> def two():
...     import math
...     return (math.e ** (0+1J*math.pi)) + 3
... 
>>> two()
(2+1.2246063538223773e-16j)
>>> two.func_code.co_code
'd\x01\x00d\x00\x00k\x00\x00}\x00\x00|\x00\x00i\x01\x00d\x02\x00d\x03
\x00|\x00\x00i\x02\x00\x14\x17\x13d\x04\x00\x17S'
>>> dis.dis(two)
  2           0 LOAD_CONST               1 (-1)
              3 LOAD_CONST               0 (None)
              6 IMPORT_NAME              0 (math)
              9 STORE_FAST               0 (math)

  3          12 LOAD_FAST                0 (math)
             15 LOAD_ATTR                1 (e)
             18 LOAD_CONST               2 (0)
             21 LOAD_CONST               3 (1j)
             24 LOAD_FAST                0 (math)
             27 LOAD_ATTR                2 (pi)
             30 BINARY_MULTIPLY     
             31 BINARY_ADD          
             32 BINARY_POWER        
             33 LOAD_CONST               4 (3)
             36 BINARY_ADD          
             37 RETURN_VALUE        





From davea at ieee.org  Wed May 13 13:42:43 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 13 May 2009 13:42:43 -0400
Subject: PythonCard - My app stuck when button clicked
In-Reply-To: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>
References: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>
Message-ID: <4A0B0693.2030200@ieee.org>

daved170 wrote:
> Hi there,
> I'm newbie in pythonCard.
> I have an application with 2 buttons : START , STOP
> Start execute a while(1) loop that execute my calculations.
> Stop suppose to raise a flag that will end that loop.
>
> Whenever I pish the START button my GUI is stuck. the calculation
> executes but I can't push the STOP button.
>
> I added thread that START start a thread that execute my calculations.
> I also added a Global variable that will hold the indication if the
> loop should continue.
> The problem now is that the thread ignore that variable and loop
> forever.
>
> Is there a simple way to make sure that the GUI won't stuck (without
> threads)?
> And if there isn't such way I would appriciet it very much if anyone
> could post an example of how to make my thread read that variable
> Thanks
> Dave
>
>   
I don't know PythonCard, but most GUI's are similar enough that the 
concepts will work, even though the details differ.  I'll assume that 
PythonCard has a traditional event loop, from which all events are 
dispatched.

If your loop is fairly small, then you should keep it to one thread.  
Debugging it will usually be much easier.  The trick is to break the 
task into pieces (each piece might be once around what is now a loop), 
and invoke one piece each time the event loop empties.  I can't tell you 
how to do that without seeing your loop, but it's not usually very hard.

Now, there is some way of POSTing an event to the event loop.  That puts 
the event *after* all the events that are already there, but returns 
control immediately.  So create a custom event, and POST it from the 
START button's button-pressed event.  That will fire off one "loop" of 
the special task, in other words, make one function call to your new 
function.  Then at the end of the function, POST it again, unless the 
STOP button has been pressed in the meantime.

An optimization for this is to use coroutines, which are usually done 
with a generator.  It's much trickier to describe, but much easier to 
accomplish.  Roughly, you'd take your existing loop, and put a yield 
statement in it at appropriate place(s).  Then the custom event is 
simply a call to the .next() function of that generator.



Now, threading isn't that tough either, depending on how much data is 
being shared between the thread and the main program.  You say that 
sharing a global flag isn't working, but it should.  So how about if you 
show us some code, and somebody'll spot the trouble.  For example, is 
the thread defined in the same module as the App?  Global only shares 
between a single module.  Another reason globals might seem to fail is 
if you tried to do mutual imports between two or more modules.  (A 
imports B, which imports A).  Sometimes that fails in mysterious ways.


Make a simple (stripped) example of what you're trying, and we'll try to 
find the problem.  Without concrete code, we end up with ambiguities 
like the above usage of two different meanings for "the loop."



From Scott.Daniels at Acm.Org  Wed May 13 13:53:26 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 13 May 2009 10:53:26 -0700
Subject: What's the use of the else in try/except/else?
In-Reply-To: <76v01gF1evk90U1@mid.individual.net>
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net>
	<gu9fl8$nmh$1@reader1.panix.com>
	<76v01gF1evk90U1@mid.individual.net>
Message-ID: <hJadnVLfGu9EmpbXnZ2dnUVZ_uGdnZ2d@pdx.net>

greg wrote:
> kj wrote:
> 
>> Wow.  As rationales for syntax constructs go, this has got to be
>> the most subtle one I've ever seen...
> 
> It's to avoid masking bugs. Suppose you accidentally
> wrote
> 
>   try:
>     v = mumble.field
>     sys.warming('field was actually there?')
>   except AttributeError:
>     pass
> 
> Then you could easily fail to notice that
> you had written 'warming' instead of 'warning'.
> 
Well, if you look, you'll discover that warning is not in the
sys module at all, but in the logging module.
So the original example already demonstrated the problem.

--Scott David Daniels
Scott.Daniels at Acm.Org


From nad at acm.org  Wed May 13 13:53:30 2009
From: nad at acm.org (Ned Deily)
Date: Wed, 13 May 2009 10:53:30 -0700
Subject: json vs. simplejson
References: <76vqi5F1eq4rjU1@mid.individual.net>
	<76vr3uF1ejv91U1@mid.uni-berlin.de>
	<76vs9tF1f6c58U1@mid.individual.net>
Message-ID: <nad-B321E6.10533013052009@news.gmane.org>

In article <76vs9tF1f6c58U1 at mid.individual.net>,
 Thomas Heller <theller at python.net> wrote:
> Diez B. Roggisch schrieb:
> > Thomas Heller wrote:
> >> Python 2.6 contains the json module, which I thought was the renamed (and
> >> improved?) simplejson module that also works on older Python versions.
> >> 
> >> However, it seems the json is a lot slower than simplejson.
> >> This little test, run on Python 2.6.2 and WinXP shows a dramatic
> >> difference:
> >>   C:\>py26 -m timeit -s "from json import dumps, loads"
> >>   "loads(dumps(range(32)))" 1000 loops, best of 3: 618 usec per loop
> >> 
> >>   C:\>py26 -m timeit -s "from simplejson import dumps, loads"
> >>   "loads(dumps(range(32)))" 10000 loops, best of 3: 31 usec per loop> >> 
> >> Does anyone have an explanation for that?
> > 
> > Dunno about json, but simplejson comes with an (optional) C-based
> > speedup-module.
> > 
> > Maybe this isn't part of the standard distribution? 
> json has it's own _json speedup module.  And funny, on Linux, json
> WITH _json is still somewhat slower (~10%) than simplejson WITHOUT
> the _speedups module.

According to the svn history in 2.6, the json module was a copy of 
simplejson 1.9.  The current version of simplejson is 2.0.9 and, 
according to its CHANGES.txt, there have been a number of performance 
improvements in the various releases since 1.9.  Looks like the trunk 
(2.7) version of json has been updated to the latest simplejson.

-- 
 Ned Deily,
 nad at acm.org



From piet at cs.uu.nl  Wed May 13 14:03:04 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 13 May 2009 20:03:04 +0200
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
Message-ID: <m27i0kc23r.fsf@cs.uu.nl>

>>>>> godshorse <chinthakawk at gmail.com> (g) wrote:

>g> Hello,
>g> I want to find out the shortest path tree from a root to several nodes
>g> in a graph data structure. I found a Dijkstra code from internet that
>g> finds shortest path between only two nodes. How can i extend it to a
>g> tree?. And what is the best way to represent a tree in Python?.

http://networkx.lanl.gov/ has all kinds of Dijkstra's algorithms.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From adnanhameed750 at gmail.com  Wed May 13 14:54:54 2009
From: adnanhameed750 at gmail.com (adnan ji)
Date: Wed, 13 May 2009 11:54:54 -0700 (PDT)
Subject: get detail about latest computer
Message-ID: <38d0393e-795d-42bf-8d16-bded41d302bb@d2g2000pra.googlegroups.com>

its for you get about latest computer laptop free more visit www.glu007.blog.com


From theller at python.net  Wed May 13 14:58:10 2009
From: theller at python.net (Thomas Heller)
Date: Wed, 13 May 2009 20:58:10 +0200
Subject: json vs. simplejson
In-Reply-To: <mailman.97.1242237243.8015.python-list@python.org>
References: <76vqi5F1eq4rjU1@mid.individual.net>	<76vr3uF1ejv91U1@mid.uni-berlin.de>	<76vs9tF1f6c58U1@mid.individual.net>
	<mailman.97.1242237243.8015.python-list@python.org>
Message-ID: <770ji2F1f5a7rU1@mid.individual.net>

Ned Deily schrieb:
> In article <76vs9tF1f6c58U1 at mid.individual.net>,
>  Thomas Heller <theller at python.net> wrote:
>> Diez B. Roggisch schrieb:
>> > Thomas Heller wrote:
>> >> Python 2.6 contains the json module, which I thought was the renamed (and
>> >> improved?) simplejson module that also works on older Python versions.
>> >> 
>> >> However, it seems the json is a lot slower than simplejson.
>> >> This little test, run on Python 2.6.2 and WinXP shows a dramatic
>> >> difference:
>> >>   C:\>py26 -m timeit -s "from json import dumps, loads"
>> >>   "loads(dumps(range(32)))" 1000 loops, best of 3: 618 usec per loop
>> >> 
>> >>   C:\>py26 -m timeit -s "from simplejson import dumps, loads"
>> >>   "loads(dumps(range(32)))" 10000 loops, best of 3: 31 usec per loop> >> 
>> >> Does anyone have an explanation for that?
>> > 
>> > Dunno about json, but simplejson comes with an (optional) C-based
>> > speedup-module.
>> > 
>> > Maybe this isn't part of the standard distribution? 
>> json has it's own _json speedup module.  And funny, on Linux, json
>> WITH _json is still somewhat slower (~10%) than simplejson WITHOUT
>> the _speedups module.
> 
> According to the svn history in 2.6, the json module was a copy of 
> simplejson 1.9.  The current version of simplejson is 2.0.9 and, 
> according to its CHANGES.txt, there have been a number of performance 
> improvements in the various releases since 1.9.  Looks like the trunk 
> (2.7) version of json has been updated to the latest simplejson.
> 

Ok, thanks.  I've submitted a bug for python2.6, but it seems they
will not upgrade to a newer version.
<http://bugs.python.org/issue6013>

Thomas


From debatem1 at gmail.com  Wed May 13 15:27:53 2009
From: debatem1 at gmail.com (CTO)
Date: Wed, 13 May 2009 12:27:53 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com> 
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com> 
	<98ea5010-2eab-43de-b5a2-d4f79a06f25e@z19g2000vbz.googlegroups.com>
Message-ID: <50902c22-df00-4fb8-bc7b-1f596387ea32@j12g2000vbl.googlegroups.com>

On May 13, 8:19?am, bearophileH... at lycos.com wrote:
> godshorse, you may use the "shortestPaths" method of this graph class
> of mine:http://sourceforge.net/projects/pynetwork/
>
> (It uses the same Dijkstra code by Eppstein).
> (Once you have all distances from a node to the other ones, it's not
> too much difficult to find the tree you talk about).
>
> Also see the Minimum spanning tree:http://en.wikipedia.org/wiki/Minimum_spanning_tree
>
> Bye,
> bearophile

Let me add a caution to what bearophile says here- a minimum spanning
tree minimizes
the weight of the *whole tree*, not the individual paths in that tree,
which seems
to be what you're going after. Those can be pretty different things.

Geremy Condra


From ajaksu at gmail.com  Wed May 13 15:42:24 2009
From: ajaksu at gmail.com (ajaksu)
Date: Wed, 13 May 2009 12:42:24 -0700 (PDT)
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
References: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>
	<51d1dd3f-322d-47fa-9d44-75b92c6ef4e2@e20g2000vbc.googlegroups.com>
Message-ID: <2003c02c-6a9f-40fb-b19c-30625ed09eb0@s21g2000vbb.googlegroups.com>

henning.vonbar wrote:
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> ? File "/usr/local/lib/python2.6/threading.py", line 952, in _test
> ? ? t.start()
> ? File "/usr/local/lib/python2.6/threading.py", line 471, in start
> ? ? _start_new_thread(self.__bootstrap, ())
> thread.error: can't start new thread

What do you get with:
import thread
thread.start_new_thread(int, ('1',2))

?

Daniel


From gunterhenriksen at gmail.com  Wed May 13 15:49:05 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Wed, 13 May 2009 12:49:05 -0700
Subject: x.abc vs x['abc']
Message-ID: <ab4fa3490905131249q16d608f5t67131c435603a38f@mail.gmail.com>

Presuming it is very common to have objects created
on the fly using some sort of external data
definitions, is there an obvious common standard
way to take a dict object and create an object
whose attribute names are the keys from the dict?

I realize I can do something like:

>>> d = {"hello": "world"}
>>> x = type("", (object,), d)()
>>> x.hello
world

but that seems like an arcane way to do something
which would ideally be transparent... if there is
a function in the standard library, that would be
good, even if I have to import it.  I guess there is
collections.namedtuple... that would not look much
prettier... but the main thing to me is for it to
be the same way everybody else does it.  I do not
prefer the new object be a dict, but it would be ok.


From lists at cheimes.de  Wed May 13 16:00:23 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 13 May 2009 22:00:23 +0200
Subject: x.abc vs x['abc']
In-Reply-To: <ab4fa3490905131249q16d608f5t67131c435603a38f@mail.gmail.com>
References: <ab4fa3490905131249q16d608f5t67131c435603a38f@mail.gmail.com>
Message-ID: <guf8so$oii$1@ger.gmane.org>

Gunter Henriksen wrote:
> but that seems like an arcane way to do something
> which would ideally be transparent... if there is
> a function in the standard library, that would be
> good, even if I have to import it.  I guess there is
> collections.namedtuple... that would not look much
> prettier... but the main thing to me is for it to
> be the same way everybody else does it.  I do not
> prefer the new object be a dict, but it would be ok.

Most objects have an attribute called '__dict__' that acts as a
container for the attributes of an object.

>>> class Container(object):
...     pass
...
>>> container = Container()
>>> d = {"hello": "world"}
>>> container.__dict__.update(d)
>>> container.hello
'world'

You can also implemenet __getattr__() like:

    def __getattr__(self, name):
        try:
            return self.data[name]
        except KeyError:
            raise AttributeError(name)

HTH

Christian



From clp2 at rebertia.com  Wed May 13 16:53:37 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 13 May 2009 13:53:37 -0700
Subject: x.abc vs x['abc']
In-Reply-To: <guf8so$oii$1@ger.gmane.org>
References: <ab4fa3490905131249q16d608f5t67131c435603a38f@mail.gmail.com>
	<guf8so$oii$1@ger.gmane.org>
Message-ID: <50697b2c0905131353l126d9aaas7a3e0ac0d57e789d@mail.gmail.com>

On Wed, May 13, 2009 at 1:00 PM, Christian Heimes <lists at cheimes.de> wrote:
> Gunter Henriksen wrote:
>> but that seems like an arcane way to do something
>> which would ideally be transparent... if there is
>> a function in the standard library, that would be
>> good, even if I have to import it. ?I guess there is
>> collections.namedtuple... that would not look much
>> prettier... but the main thing to me is for it to
>> be the same way everybody else does it. ?I do not
>> prefer the new object be a dict, but it would be ok.
>
> Most objects have an attribute called '__dict__' that acts as a
> container for the attributes of an object.
>
>>>> class Container(object):
> ... ? ? pass
> ...
>>>> container = Container()
>>>> d = {"hello": "world"}
>>>> container.__dict__.update(d)
>>>> container.hello
> 'world'
>
> You can also implemenet __getattr__() like:
>
> ? ?def __getattr__(self, name):
> ? ? ? ?try:
> ? ? ? ? ? ?return self.data[name]
> ? ? ? ?except KeyError:
> ? ? ? ? ? ?raise AttributeError(name)

See also the `namedtuple` type in the `collections` module:
http://docs.python.org/library/collections.html#collections.namedtuple

Cheers,
Chris
-- 
http://blog.rebertia.com


From norseman at hughes.net  Wed May 13 16:55:51 2009
From: norseman at hughes.net (norseman)
Date: Wed, 13 May 2009 13:55:51 -0700
Subject: about Python doc reader
In-Reply-To: <1e364c4e0905130537u472cf2c8v24ab3eb725e8199d@mail.gmail.com>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>
	<1e364c4e0905130537u472cf2c8v24ab3eb725e8199d@mail.gmail.com>
Message-ID: <4A0B33D7.8000002@hughes.net>

Kushal Kumaran wrote:
> On Wed, May 13, 2009 at 4:28 PM, Shailja Gulati <shailja.gulati at tcs.com> wrote:
>> Hi ,
>>
>> I am currently working on "Information retrieval from semi structured
>> Documents" in which there is a need to read data from Resumes.
>>
>> Could anyone tell me is there any python API to read Word doc?
>>
> 
> If you're using Windows, you can use COM APIs to read Word documents.
> Or you can use OpenOffice.org using uno.  You can find examples of
> either by googling.
> 
============================
One problem that I keep getting with OOo an UNO and python. When asked 
to output a .txt file it comes out sorta pk-zipped. Same for .csv files 
it outputs.  If you can, I suggest you work with Microsoft's COM. I have 
had better luck there.  Not much, but better.  Usually get a real .txt

For what it is worth, in OOo I did have some progress by creating a 
macro to write out text in it and setting it to run on EVERY file it 
opens and ten close OOo after the write. Then batched the  OOo file.doc 
process with a:

files2process.sh            #files2process.bat  in window$
================
swriter file1.doc
swriter file2.doc
.
.

not very elegant, but it worked for me.


To be honest - I just give those to a clerk and let them point and click 
until done these days.  Less frustrating.  Documentation bad for each.


Steve


From clp2 at rebertia.com  Wed May 13 16:58:36 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 13 May 2009 13:58:36 -0700
Subject: New to python, can i ask for a little help?
In-Reply-To: <5638a6de-d07e-48a0-be73-37d81a2ba6cc@y33g2000prg.googlegroups.com>
References: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
	<mailman.72.1242188827.8015.python-list@python.org>
	<5638a6de-d07e-48a0-be73-37d81a2ba6cc@y33g2000prg.googlegroups.com>
Message-ID: <50697b2c0905131358q1399019bsa5417335a19af1a5@mail.gmail.com>

On Wed, May 13, 2009 at 12:22 PM, warhammer1805 at gmail.com
<warhammer1805 at gmail.com> wrote:
> On May 12, 9:27?pm, Chris Rebert <c... at rebertia.com> wrote:
>> On Tue, May 12, 2009 at 9:18 PM, warhammer1... at gmail.com
>>
>>
>>
>> <warhammer1... at gmail.com> wrote:
>> > I loaded python 3.1
>> > I can use the gui and i see the following:
>>
>> > Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
>> > (Intel)] on win32
>> > Type "copyright", "credits" or "license()" for more information.
>>
>> > It would seem that this is working correctly and there is no path
>> > problem.
>> > I am running windows vista.
>>
>> > When i put in a test string i see this:
>>
>> > Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
>> > (Intel)] on win32
>> > Type "copyright", "credits" or "license()" for more information.
>> >>>> print "hello world!"
>> > SyntaxError: invalid syntax (<pyshell#0>, line 1)
>>
>> > Can anyone tell me what is wrong? I didnt expect that error....
>>
>> The print-statement was removed in Python 3.0. Now it's just a
>> function. You'll have to use:
>>
>> print("hello world!")
>>
>> instead.
>>
>> Please also read the 3.0 transition docs:http://docs.python.org/3.0/whatsnew/3.0.html
>> Note that Python 3.0 differs significantly from Python 2.x
>>
>> Cheers,
>> Chris
>> --http://blog.rebertia.com
>
> Hi Chris,
> Thank you for the pointer! that sure helped alot.
> Do you think i should be using a different version of python? I dont
> normally do much programming. I used to do some C along time ago. I
> want to get into something again and python seems to be popular.

You should probably use Python v2.6 instead for the time being; most
libraries have yet to be ported to Python 3.0, so 2.6 has many more
libraries available for it currently. Python 3.0 is also mostly the
same as 2.6, so learning 2.6 won't be a waste of time and will help
you when the full transition to 3.0 is eventually made.

> Could you also tell me who uses python in IT areas? I see alot of
> python and Mysql. And i see python developer jobs as standalone too.

See http://www.python.org/about/apps/ and http://www.python.org/about/success/

Cheers,
Chris
-- 
http://blog.rebertia.com


From norseman at hughes.net  Wed May 13 17:00:58 2009
From: norseman at hughes.net (norseman)
Date: Wed, 13 May 2009 14:00:58 -0700
Subject: about Python doc reader
In-Reply-To: <4A0AC4C7.1060000@timgolden.me.uk>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>
	<4A0AC4C7.1060000@timgolden.me.uk>
Message-ID: <4A0B350A.7040006@hughes.net>

Tim Golden wrote:
> Shailja Gulati wrote:
>> Hi ,
>>
>> I am currently working on "Information retrieval from semi structured 
>> Documents" in which there is a need to read data from Resumes.
>>
>> Could anyone tell me is there any python API to read Word doc?
> 
> If you haven't already, get hold of the pywin32 extensions:
> 
>  http://pywin32.sf.net
> 
> <code>
> import win32com.client
> 
> doc = win32com.client.GetObject ("c:/temp/temp.doc")
> text = doc.Range ().Text
> 
> </code>
> 
> Note that this will give you a unicode object with \r line-delimiters.
> You could read para by para if that were more useful:
> 
> <code>
> import win32com.client
> 
> doc = win32com.client.GetObject ("c:/temp/temp.doc")
> lines = [p.Range () for p in doc.Paragraphs]
> 
> </code>
> 
> TJG
=======================
I saw this right after responding to Kushal's 5:37AM today posting.

Thank you for the tip.  I'll try these first chance I get.
Word, swriter, whatever - I'm not partial when it comes to automating.


Today is: 20090513

Steve


From norseman at hughes.net  Wed May 13 17:48:47 2009
From: norseman at hughes.net (norseman)
Date: Wed, 13 May 2009 14:48:47 -0700
Subject: about Python doc reader
In-Reply-To: <4A0B350A.7040006@hughes.net>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>	<4A0AC4C7.1060000@timgolden.me.uk>
	<4A0B350A.7040006@hughes.net>
Message-ID: <4A0B403F.2090806@hughes.net>

norseman wrote:
> Tim Golden wrote:
>> Shailja Gulati wrote:
>>> Hi ,
>>>
>>> I am currently working on "Information retrieval from semi structured 
>>> Documents" in which there is a need to read data from Resumes.
>>>
>>> Could anyone tell me is there any python API to read Word doc?
>>
>> If you haven't already, get hold of the pywin32 extensions:
>>
>>  http://pywin32.sf.net
>>
>> <code>
>> import win32com.client
>>
>> doc = win32com.client.GetObject ("c:/temp/temp.doc")
>> text = doc.Range ().Text
>>
>> </code>
>>
>> Note that this will give you a unicode object with \r line-delimiters.
>> You could read para by para if that were more useful:
>>
>> <code>
>> import win32com.client
>>
>> doc = win32com.client.GetObject ("c:/temp/temp.doc")
>> lines = [p.Range () for p in doc.Paragraphs]
>>
>> </code>
>>
>> TJG
> =======================
> I saw this right after responding to Kushal's 5:37AM today posting.
> 
> Thank you for the tip.  I'll try these first chance I get.
> Word, swriter, whatever - I'm not partial when it comes to automating.
> 
> 
> Today is: 20090513
> 
> Steve
================================
Interesting:

I did try these.

Doc at once:
outputs two x'0D' and the file.  Then it appends x'0D' x'0D' x'0A' x'0D' 
x'0A' to end of file even though source file itself has no EOL.
( EOL is EndOfLine  aka newline )

That's  cr cr             There are two blank lines at begining.
         cr cr lf cr lf    There is no EOL in source
                           Any idea what those are about?
One crlf is probably from python's print text, but the other?

The lines=
appends   [u'\r', u'\r', u"  to begining of output
and   \r"]x'0D'x'0A'   to the end even though there is no EOL in source.

output is understood:    u'\r'  is Apple EOL
the crlf is probably from print lines.

Programmers searching for specifics take note. The output is cooked.
I don't have any "weird things" in the test file. (no font changes, no 
subscripts, etc)  Might be best to take a real good look at a test file 
before assuming anything.

But, having an idea of what the extras are makes it somewhat easier to 
allow for.


Steve


From socyl at 987jk.com.invalid  Wed May 13 17:50:41 2009
From: socyl at 987jk.com.invalid (kj)
Date: Wed, 13 May 2009 21:50:41 +0000 (UTC)
Subject: How to get all named args in a dict?
Message-ID: <guffbh$7do$1@reader1.panix.com>



Suppose I have the following:

def foo(x=None, y=None, z=None):
    d = {"x": x, "y": y, "z": z}
    return bar(d)

I.e. foo takes a whole bunch of named arguments and ends up calling
a function bar that takes a single dictionary as argument, and this
dictionary has the same keys as in foo's signature, so to speak.

Is there some builtin variable that would be the same as the variable
d, and would thus obviate the need to explicitly bind d?

Thanks!

kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From e.kroske at gmail.com  Wed May 13 17:51:28 2009
From: e.kroske at gmail.com (Evan Kroske)
Date: Wed, 13 May 2009 17:51:28 -0400
Subject: Odd list behavior
Message-ID: <4A0B40E0.2060600@gmail.com>

I'm working on a simple file processing utility, and I encountered a 
weird error. If I try to get the first element of a list I'm splitting 
from a string, I get an error:

key = string.split()[0]
Error!

However, I can slice the list like normal, but that gives me a 
one-element-long list:

key = string.split()[:1]
Success!

Finally, the operation works perfectly if I initialize the list beforehand:

list = string.split()
key = list[0]
Success!

Why does this happen?
-- |
Evan Kroske
Welcome2Obscurity.Blogspot.com <http://welcome2obscurity.blogspot.com>
Glory is fleeting, but obscurity is forever. ? some French guy |


From clp2 at rebertia.com  Wed May 13 17:59:39 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 13 May 2009 14:59:39 -0700
Subject: How to get all named args in a dict?
In-Reply-To: <guffbh$7do$1@reader1.panix.com>
References: <guffbh$7do$1@reader1.panix.com>
Message-ID: <50697b2c0905131459l2903cc2bpd0108080d7bf2f5c@mail.gmail.com>

On Wed, May 13, 2009 at 2:50 PM, kj <socyl at 987jk.com.invalid> wrote:
>
>
> Suppose I have the following:
>
> def foo(x=None, y=None, z=None):
> ? ?d = {"x": x, "y": y, "z": z}
> ? ?return bar(d)
>
> I.e. foo takes a whole bunch of named arguments and ends up calling
> a function bar that takes a single dictionary as argument, and this
> dictionary has the same keys as in foo's signature, so to speak.
>
> Is there some builtin variable that would be the same as the variable
> d, and would thus obviate the need to explicitly bind d?

def foo(**kwargs):
    return bar(kwargs)

I would suggest you read the Python tutorial.

Cheers,
Chris
-- 
http://blog.rebertia.com


From clp2 at rebertia.com  Wed May 13 18:05:10 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 13 May 2009 15:05:10 -0700
Subject: Odd list behavior
In-Reply-To: <4A0B40E0.2060600@gmail.com>
References: <4A0B40E0.2060600@gmail.com>
Message-ID: <50697b2c0905131505q5bc24d78x6b2a4acb628c77de@mail.gmail.com>

On Wed, May 13, 2009 at 2:51 PM, Evan Kroske <e.kroske at gmail.com> wrote:
> I'm working on a simple file processing utility, and I encountered a weird
> error. If I try to get the first element of a list I'm splitting from a
> string, I get an error:
>
> key = string.split()[0]
> Error!
>
> However, I can slice the list like normal, but that gives me a
> one-element-long list:
>
> key = string.split()[:1]
> Success!
>
> Finally, the operation works perfectly if I initialize the list beforehand:
>
> list = string.split()
> key = list[0]
> Success!
>
> Why does this happen?

Please include the actual error messages and Tracebacks in the future.
"Error!" and "Success!" aren't much to go on; and answering your
question without further information is just a guessing game at best.

Cheers,
Chris
-- 
http://blog.rebertia.com


From norseman at hughes.net  Wed May 13 18:08:26 2009
From: norseman at hughes.net (norseman)
Date: Wed, 13 May 2009 15:08:26 -0700
Subject: Odd list behavior
In-Reply-To: <4A0B40E0.2060600@gmail.com>
References: <4A0B40E0.2060600@gmail.com>
Message-ID: <4A0B44DA.2040107@hughes.net>

Evan Kroske wrote:
> I'm working on a simple file processing utility, and I encountered a 
> weird error. If I try to get the first element of a list I'm splitting 
> from a string, I get an error:
> 
> key = string.split()[0]
> Error!
> 
> However, I can slice the list like normal, but that gives me a 
> one-element-long list:
> 
> key = string.split()[:1]
> Success!
> 
> Finally, the operation works perfectly if I initialize the list beforehand:
> 
> list = string.split()
> key = list[0]
> Success!
> 
> Why does this happen?
> -- |
> Evan Kroske
> Welcome2Obscurity.Blogspot.com <http://welcome2obscurity.blogspot.com>
> Glory is fleeting, but obscurity is forever. ? some French guy |

==========================
Take a look at the  split() command.

I think you will find you need one var on the left side for each piece 
on the right.

a="x y"
b,c= a.split()
b
x
c
y


Maybe???


Steve


From rhodri at wildebst.demon.co.uk  Wed May 13 18:20:31 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 13 May 2009 23:20:31 +0100
Subject: n00b question: Possible to pass lists to a Template class?
In-Reply-To: <5cdc08d7-c9d9-415d-9ae8-5a67cd94dbc4@s28g2000vbp.googlegroups.com>
References: <cc34bfbc-e6a8-47ed-af95-adf0d42cf9e2@t11g2000vbc.googlegroups.com>
	<5cdc08d7-c9d9-415d-9ae8-5a67cd94dbc4@s28g2000vbp.googlegroups.com>
Message-ID: <op.utv20hp0a8ncjz@gnudebst>

On Wed, 13 May 2009 17:22:32 +0100, Wells <wells at submute.net> wrote:

> On May 13, 11:14?am, Wells <we... at submute.net> wrote:
>> Is it possible to pass a list to the Template.substitute method and
>> use that in the template, like so..
>>
>> g = string.Template(gametemplate)
>> print g.substitute(recap = "none", winner = game["winner"], loser =
>> game["loser"])
>>
>> Then in the template...
>>
>> <b>winner.team
>>
>> Where winner.team would be the value of game["winner"]["team"].
>>
>> Thanks!
>
> Sorry, I meant dicts, not lists. Like I said, n00b question.

Basically, no.  Substituted values are effectively put into the
template with '%s' substitution, so you'll just get a string
representation of your dictionary.  You could play around with
defining your own custom Template class, but it's probably not
worth the effort.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From __peter__ at web.de  Wed May 13 18:23:47 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 14 May 2009 00:23:47 +0200
Subject: Odd list behavior
References: <mailman.105.1242251505.8015.python-list@python.org>
Message-ID: <gufh9g$a49$03$1@news.t-online.com>

Evan Kroske wrote:

> I'm working on a simple file processing utility, and I encountered a
> weird error. If I try to get the first element of a list I'm splitting
> from a string, I get an error:
> 
> key = string.split()[0]
> Error!

When string contains only whitespace string.split() returns an empty list an 
then

>>> [][0]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list index out of range

> However, I can slice the list like normal, but that gives me a
> one-element-long list:
> 
> key = string.split()[:1]
> Success!

The slice length may be shorter than specified:

>>> [][:1]
[]


> Finally, the operation works perfectly if I initialize the list
> beforehand:
> 
> list = string.split()
> key = list[0]
> Success!

Not with the same string as in your previous examples.

Peter



From emile at fenx.com  Wed May 13 18:24:27 2009
From: emile at fenx.com (Emile van Sebille)
Date: Wed, 13 May 2009 15:24:27 -0700
Subject: Odd list behavior
In-Reply-To: <4A0B40E0.2060600@gmail.com>
References: <4A0B40E0.2060600@gmail.com>
Message-ID: <gufhav$j7p$1@ger.gmane.org>

On 5/13/2009 2:51 PM Evan Kroske said...
> I'm working on a simple file processing utility, and I encountered a 
> weird error. If I try to get the first element of a list I'm splitting 
> from a string, 


What value of string gives these results?

Emile


> I get an error:
> 
> key = string.split()[0]
> Error!
> 
> However, I can slice the list like normal, but that gives me a 
> one-element-long list:
> 
> key = string.split()[:1]
> Success!
> 
> Finally, the operation works perfectly if I initialize the list beforehand:
> 
> list = string.split()
> key = list[0]
> Success!
> 
> Why does this happen?
> -- |
> Evan Kroske
> Welcome2Obscurity.Blogspot.com <http://welcome2obscurity.blogspot.com>
> Glory is fleeting, but obscurity is forever. ? some French guy |



From rhodri at wildebst.demon.co.uk  Wed May 13 18:24:38 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 13 May 2009 23:24:38 +0100
Subject: Odd list behavior
In-Reply-To: <4A0B44DA.2040107@hughes.net>
References: <4A0B40E0.2060600@gmail.com> <4A0B44DA.2040107@hughes.net>
Message-ID: <op.utv27casa8ncjz@gnudebst>

On Wed, 13 May 2009 23:08:26 +0100, norseman <norseman at hughes.net> wrote:

> Evan Kroske wrote:
>> I'm working on a simple file processing utility, and I encountered a  
>> weird error. If I try to get the first element of a list I'm splitting  
>> from a string, I get an error:
>>  key = string.split()[0]
>> Error!
>>  However, I can slice the list like normal, but that gives me a  
>> one-element-long list:
>>  key = string.split()[:1]
>> Success!
>>  Finally, the operation works perfectly if I initialize the list  
>> beforehand:
>>  list = string.split()
>> key = list[0]
>> Success!
>>  Why does this happen?

>
> ==========================
> Take a look at the  split() command.
>
> I think you will find you need one var on the left side for each piece  
> on the right.

Given that he's immediately indexing the split results, that's irrelevant.
There's no point in even guessing with out the traceback.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From skippy.hammond at gmail.com  Wed May 13 18:33:12 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Thu, 14 May 2009 08:33:12 +1000
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <64fc05ead382d1a8490deb9a07bd5f01@preisshare.net>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>	<mailman.22.1242108050.8015.python-list@python.org>	<02oOl.710$wR5.489@nwrddc02.gnilink.net>	<mailman.65.1242174135.8015.python-list@python.org>	<4a0a3f40$0$24009$9b622d9e@news.freenet.de>
	<64fc05ead382d1a8490deb9a07bd5f01@preisshare.net>
Message-ID: <4A0B4AA8.2090703@gmail.com>

On 13/05/2009 2:18 PM, David Lyon wrote:
> On Wed, 13 May 2009 05:32:16 +0200, "Martin v. L?wis"<martin at v.loewis.de>
> wrote:
>
>> I think this was a case of obscure misconfiguration of the system.
>> It is always possible to configure a system in such a way that even
>> the most resilient installation procedure will break.
>
> Technically, you are right..
>
> but imho.. windows installers are overkill and shouldn't be used
> for this sort of thing. That is, installing libraries. And not
> the fault of the package authors either...

But if PYTHONPATH was set incorrectly it really doesn't matter how 
Python was installed, it would still fail.  The installer didn't set 
PYTHONPATH, a human did.

Cheers,

Mark


From agaskins_ng at kelleramerica.com  Wed May 13 18:36:07 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Wed, 13 May 2009 18:36:07 -0400
Subject: When *don't* I use 'self' in classes?
Message-ID: <rXHOl.41113$5N7.8212@newsfe09.iad>

I am a bit confused as too when, if ever, it is not appropriate to prepend 
'self' to objects in a class. All of the examples of how to use 'self' that 
I find seem to be short and very simple (as examples tent to be). I 
appologize if I am asking an ignorant question here, but I want to get off 
on the right foot. Here's an example of what I mean:

import serial
class foo:
    def __init(self, comport):
        self.comport = comport
        self.baudrate = 9600 #default
        self.ser = serial
        try:
            self.ser.Serial()
            self.ser.baudrate = self.baudrate
            self.ser.open()
        except:
            print 'Serial port could not be opened'

=== OR ===
import serial
class foo:
    def __init(self, comport):
        self.comport = comport
        self.baudrate = 9600 #default
        try:
            ser = serial.Serial()
            ser.baudrate = self.baudrate
            ser.open()
        except:
            print 'Serial port could not be opened'

There may be a typo in here, this is just a random example similar to 
something I'm working with, but which one of these are more 'proper'? If I 
am importing a library do I still prepend it's object with self when I use 
it in my class? I suppose my question is just basically... when do you NOT 
prepent an object in a class with 'self'?

I'm not even sure I'm using the term 'object' correctly here. Feel free to 
set me straight, but I hope my example makes it clear what I am asking.

Thanks a lot, this ng has already been super helpful as I take my 
crash-course in to python! :P 




From tjreedy at udel.edu  Wed May 13 18:42:56 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 13 May 2009 18:42:56 -0400
Subject: How to get all named args in a dict?
In-Reply-To: <guffbh$7do$1@reader1.panix.com>
References: <guffbh$7do$1@reader1.panix.com>
Message-ID: <gufidh$m34$1@ger.gmane.org>

kj wrote:
> 
> Suppose I have the following:
> 
> def foo(x=None, y=None, z=None):
>     d = {"x": x, "y": y, "z": z}
>     return bar(d)
> 
> I.e. foo takes a whole bunch of named arguments and ends up calling
> a function bar that takes a single dictionary as argument, and this
> dictionary has the same keys as in foo's signature, so to speak.
> 
> Is there some builtin variable that would be the same as the variable
> d, and would thus obviate the need to explicitly bind d?

Use the built-in function locals()
 >>> def f(a,b):
	x=locals()
	print(x)

 >>> f(1,2)
{'a': 1, 'b': 2}



From rtw at freenet.co.uk  Wed May 13 18:46:16 2009
From: rtw at freenet.co.uk (Rob Williscroft)
Date: Wed, 13 May 2009 17:46:16 -0500
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
	<guao50$1jv$1@panix3.panix.com>
	<Xns9C09513903E8FrtwfreenetREMOVEcouk@216.196.109.145>
	<gud8pj$b3g$1@panix3.panix.com>
	<b722bd36-c8f1-4cdf-8625-2550cee21511@i28g2000prd.googlegroups.com>
Message-ID: <Xns9C0AF2325396FrtwfreenetREMOVEcouk@216.196.109.145>

John Machin wrote in news:b722bd36-c8f1-4cdf-8625-2550cee21511
@i28g2000prd.googlegroups.com in comp.lang.python:

> On May 13, 11:46?am, a... at pythoncraft.com (Aahz) wrote:
>> In article <Xns9C09513903E8FrtwfreenetREMOVEc... at 216.196.109.145>,
>> Rob Williscroft ?<r... at freenet.co.uk> wrote:
>>
>>
>>
>> >Aahz wrote innews:guao50$1jv$1 at panix3.panix.comin comp.lang.python:
>> >> In article <Xns9C08E179B66D8rtwfreenetREMOVEc... at 216.196.109.145>,
>> >> Rob Williscroft ?<r... at freenet.co.uk> wrote:
>>
>> >>>db.execute( '''
>> >>> ? ? ? ? update "sessions" set "uid" = ?
>> >>> ? ? ? ? where "uid" = ?
>> >>> ? ? ? ? and exists(
>> >>> ? ? ? ? ? ? ? ? ?select * from "users" where "uid" > = ?
>> >>> ? ? ? ? ? )
>> >>> ? ?''',
>> >>> ? ?(v['uid'],s.SID, v['uid'])
>> >>> ?)
>>
>> >> This will be more efficient if you do "select uid from users".
>>
>> >What will be more efficient ?
>>
>> >Do you mean the "select * ..." or do you want to take the exists
>> >sub-query out and put it in a python if ?
>>
>> "select uid" will be more efficient than "select *", although I
>> suppose I could be wrong about that given how little I know about
>> current query optimizers.

It seems the usual advice about premeture optimisation should apply,
namely write clear code (*), then optimise the bottlenecks when you 
actualy find you need to.

*) for some definition of "clear code".

> My take is that it won't matter what you select if the optimiser is
> smart enough; something that requires minimal resources to produce is
> indicated in case the optimiser is dumb:
> 
>  ... exists (select 1 from ... )

I have to maintain some code writen by someone who thinks replacing 
"*" in queries with "1" is always a good idea (you know just in case), 
he wrote: 

    	select count(1) from ...

of course it didn't do what he thought it did.

Rob.
-- 
http://www.victim-prime.dsl.pipex.com/


From rhodri at wildebst.demon.co.uk  Wed May 13 19:03:41 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 14 May 2009 00:03:41 +0100
Subject: When *don't* I use 'self' in classes?
In-Reply-To: <rXHOl.41113$5N7.8212@newsfe09.iad>
References: <rXHOl.41113$5N7.8212@newsfe09.iad>
Message-ID: <op.utv40fqqa8ncjz@gnudebst>

On Wed, 13 May 2009 23:36:07 +0100, Adam Gaskins  
<agaskins_ng at kelleramerica.com> wrote:

> I am a bit confused as too when, if ever, it is not appropriate to  
> prepend
> 'self' to objects in a class. All of the examples of how to use 'self'  
> that
> I find seem to be short and very simple (as examples tent to be). I
> appologize if I am asking an ignorant question here, but I want to get  
> off
> on the right foot. Here's an example of what I mean:
>
> import serial
> class foo:
>     def __init(self, comport):
>         self.comport = comport
>         self.baudrate = 9600 #default
>         self.ser = serial
>         try:
>             self.ser.Serial()
>             self.ser.baudrate = self.baudrate
>             self.ser.open()
>         except:
>             print 'Serial port could not be opened'
>
> === OR ===
> import serial
> class foo:
>     def __init(self, comport):
>         self.comport = comport
>         self.baudrate = 9600 #default
>         try:
>             ser = serial.Serial()
>             ser.baudrate = self.baudrate
>             ser.open()
>         except:
>             print 'Serial port could not be opened'
>
> There may be a typo in here, this is just a random example similar to
> something I'm working with, but which one of these are more 'proper'? If  
> I am importing a library do I still prepend it's object with self when I  
> use it in my class? I suppose my question is just basically... when do  
> you NOT prepent an object in a class with 'self'?
>
> I'm not even sure I'm using the term 'object' correctly here. Feel free  
> to set me straight, but I hope my example makes it clear what I am  
> asking.

Prepending "self" to an identifier means that what you are using is an
attribute of the class instance that you're dealing with; i.e. you're
attaching the object to the instance.  Whether or not you want to do that
depends entirely on whether you expect to use that object ever again, or
whether you're using it once and tossing it away.

For the example you give, you're most likely to want to do neither of
the above.  The first version gives you access to the entire namespace
of the "serial" module as an attribute of instances of the class "foo",
which is unlikely to be what you want.  The second, on the other hand,
creates and opens a serial port, then throws it away.  It's more likely
that you'll want something like this:

import serial
class foo:
     def __init__(self, comport):
         self.comport = comport
         self.baudrate = 9600
         try:
             self.ser = serial.Serial()
             self.ser.baudrate = self.baudrate
             self.ser.open()
         except:
             print 'Serial port could not be opened'

     def send_data(self, data):
         self.ser.write(data)

(except that a bare 'except' like that is a very bad idea (you'll catch
keyboard interrupts and the like), but let's assume that you're doing
something more detailed for the purposes of this example.)

As you can see, making the serial port itself an attribute allows you
to use it in other methods.  If you had just used "ser" as in your
second example, it would be a local variable to the method foo.__init__(),
so it would vanish when __init__ returned just like any other local
variable.  Making it an attribute keeps it around (attached to just
that one instance of the class) so that you can use it later.

In general, don't make something an attribute if you know you're never
going to reuse it.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From google at mrabarnett.plus.com  Wed May 13 19:10:35 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 00:10:35 +0100
Subject: n00b question: Possible to pass lists to a Template class?
In-Reply-To: <op.utv20hp0a8ncjz@gnudebst>
References: <cc34bfbc-e6a8-47ed-af95-adf0d42cf9e2@t11g2000vbc.googlegroups.com>	<5cdc08d7-c9d9-415d-9ae8-5a67cd94dbc4@s28g2000vbp.googlegroups.com>
	<op.utv20hp0a8ncjz@gnudebst>
Message-ID: <4A0B536B.4050500@mrabarnett.plus.com>

Rhodri James wrote:
> On Wed, 13 May 2009 17:22:32 +0100, Wells <wells at submute.net> wrote:
> 
>> On May 13, 11:14 am, Wells <we... at submute.net> wrote:
>>> Is it possible to pass a list to the Template.substitute method and
>>> use that in the template, like so..
>>>
>>> g = string.Template(gametemplate)
>>> print g.substitute(recap = "none", winner = game["winner"], loser =
>>> game["loser"])
>>>
>>> Then in the template...
>>>
>>> <b>winner.team
>>>
>>> Where winner.team would be the value of game["winner"]["team"].
>>>
>>> Thanks!
>>
>> Sorry, I meant dicts, not lists. Like I said, n00b question.
> 
> Basically, no.  Substituted values are effectively put into the
> template with '%s' substitution, so you'll just get a string
> representation of your dictionary.  You could play around with
> defining your own custom Template class, but it's probably not
> worth the effort.
> 
The closest you can get is to pass a dict:

 >>> import string
 >>> s = string.Template("winner is $winner, loser is $loser")
 >>> s.substitute(winner="w", loser="l")
'winner is w, loser is l'
 >>> d = {"winner": "w", "loser": "l"}
 >>> s.substitute(d)
'winner is w, loser is l'



From google at mrabarnett.plus.com  Wed May 13 19:15:32 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 00:15:32 +0100
Subject: When *don't* I use 'self' in classes?
In-Reply-To: <rXHOl.41113$5N7.8212@newsfe09.iad>
References: <rXHOl.41113$5N7.8212@newsfe09.iad>
Message-ID: <4A0B5494.9040304@mrabarnett.plus.com>

Adam Gaskins wrote:
> I am a bit confused as too when, if ever, it is not appropriate to prepend 
> 'self' to objects in a class. All of the examples of how to use 'self' that 
> I find seem to be short and very simple (as examples tent to be). I 
> appologize if I am asking an ignorant question here, but I want to get off 
> on the right foot. Here's an example of what I mean:
> 
> import serial
> class foo:
>     def __init(self, comport):
           ^^^^^^
           Should be '__init__'.

>         self.comport = comport
>         self.baudrate = 9600 #default
>         self.ser = serial
>         try:
>             self.ser.Serial()
>             self.ser.baudrate = self.baudrate
>             self.ser.open()
>         except:
>             print 'Serial port could not be opened'
> 
> === OR ===
> import serial
> class foo:
>     def __init(self, comport):
>         self.comport = comport
>         self.baudrate = 9600 #default
>         try:
>             ser = serial.Serial()
>             ser.baudrate = self.baudrate
>             ser.open()
>         except:
>             print 'Serial port could not be opened'
> 
> There may be a typo in here, this is just a random example similar to 
> something I'm working with, but which one of these are more 'proper'? If I 
> am importing a library do I still prepend it's object with self when I use 
> it in my class? I suppose my question is just basically... when do you NOT 
> prepent an object in a class with 'self'?
> 
> I'm not even sure I'm using the term 'object' correctly here. Feel free to 
> set me straight, but I hope my example makes it clear what I am asking.
> 
> Thanks a lot, this ng has already been super helpful as I take my 
> crash-course in to python! :P 
> 
In the second example 'ser' is just a local variable within '__init__'.


From debatem1 at gmail.com  Wed May 13 19:22:23 2009
From: debatem1 at gmail.com (CTO)
Date: Wed, 13 May 2009 16:22:23 -0700 (PDT)
Subject: How to see the code definiton in the shell ?
References: <89dd3da60905130940l2f3560afx2a7751a354223afc@mail.gmail.com> 
	<mailman.95.1242236086.8015.python-list@python.org>
Message-ID: <f948da49-e539-434b-bec1-6e5c455b60ff@q2g2000vbr.googlegroups.com>

On May 13, 1:26?pm, "J. Cliff Dyer" <j... at sdf.lonestar.org> wrote:
> On Wed, 2009-05-13 at 09:40 -0700, Mohan Parthasarathy wrote:
> > Hi,
>
> > I am new to Python. I tried searching this but could not find an
> > answer. In the interactive shell, I write a new function and I want to
> > be able to see all the code that I wrote at a later time. Just typing
> > the function name only shows
>
> > >>> allmethods
> > <function allmethods at 0x822b0>
>
> > How do I see the actual code ?
>
> > thanks
> > mohan

If you save your function to a file you can. Saying you have the
following
file:

----------------------------
#! /usr/bin/env python3

def f(x, y):
    return x**y

----------------------------

saved as f.py, you can go into the interpreter and do:

>>> import inspect
>>> from f import f
>>> inspect.getsource(f)
'def f(x, y):\n\treturn x**y\n'

However, trying this on a function written in the interpreter
will bail on you.

Geremy Condra


From david at boddie.org.uk  Wed May 13 19:29:01 2009
From: david at boddie.org.uk (David Boddie)
Date: Thu, 14 May 2009 01:29:01 +0200
Subject: Can't run PyQt apps with MacPython
References: <25cdb69b-689c-4cfe-a378-3016b3d50e50@s21g2000vbb.googlegroups.com>
Message-ID: <gufl3t$6t$1@get-news01.get.basefarm.net>

On Wednesday 13 May 2009 17:53, Morad wrote:

> I recently got a new MacBook Pro with Leopard, and would like to
> develop using Python and PyQt. I installed the latest Qt SDK, updated
> MacPython to V 2.5.4 and then proceeded to install SIP and PyQt as
> described in Mark Summerfield's book on PyQt Programming. Everything
> went fine and none of the scripts complained. However when I want to
> run a demo app, I get the error message "Fatal Python error:
> Interpreter not initialized (version mismatch?) / Abort Trap". Anybody
> can help?

This page suggests a possible conflict between installed Python
interpreters:

http://aralbalkan.com/1675/comment-page-1

A post to the PyQt mailing list talks about the correct way to build from
source, but it may not be relevant in this case:

http://www.riverbankcomputing.com/pipermail/pyqt/2006-July/013766.html

It may just be worth checking that SIP and PyQt were built and installed
for the interpreter you expected. Failing that, you might want to ask this
again on the PyQt mailing list:

http://www.riverbankcomputing.com/pipermail/pyqt/

David


From sjmachin at lexicon.net  Wed May 13 19:35:17 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 14 May 2009 09:35:17 +1000
Subject: sqlite single transaction without foreign key or triggers
In-Reply-To: <20090513222136.2A49917005E@sv2-5.per.eftel.com>
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
	<guao50$1jv$1@panix3.panix.com>
	<Xns9C09513903E8FrtwfreenetREMOVEcouk@216.196.109.145>
	<gud8pj$b3g$1@panix3.panix.com>
	<b722bd36-c8f1-4cdf-8625-2550cee21511@i28g2000prd.googlegroups.com>
	<20090513222136.2A49917005E@sv2-5.per.eftel.com>
Message-ID: <4A0B5935.7080009@lexicon.net>

On 14/05/2009 8:21 AM, Rob Williscroft wrote in private e-mail 
(presumably by mistake):
> On 13 May 2009, you wrote in comp.lang.python:
> 
>> On May 13, 11:46?m, a... at pythoncraft.com (Aahz) wrote:
>>> In article <Xns9C09513903E8FrtwfreenetREMOVEc... at 216.196.109.145>,
>>> Rob Williscroft  <r... at freenet.co.uk> wrote:
>>>
>>>
>>>
>>>> Aahz wrote innews:guao50$1jv$1 at panix3.panix.comin comp.lang.python:
>>>>> In article <Xns9C08E179B66D8rtwfreenetREMOVEc... at 216.196.109.145>,
>>>>> Rob Williscroft  <r... at freenet.co.uk> wrote:
>>>>>> db.execute( '''
>>>>>>         update "sessions" set "uid" = ?
>>>>>>         where "uid" = ?
>>>>>>         and exists(
>>>>>>                 ?elect * from "users" where "uid" > = ?
>>>>>>           )
>>>>>>    ''',
>>>>>>    (v['uid'],s.SID, v['uid'])
>>>>>>  )
>>>>> This will be more efficient if you do "select uid from users".
>>>> What will be more efficient ?
>>>> Do you mean the "select * ..." or do you want to take the exists
>>>> sub-query out and put it in a python if ?
>>> "select uid" will be more efficient than "select *", although I
>>> suppose I could be wrong about that given how little I know about
>>> current query optimizers.
> 
> It seems the usual advice about premeture optimisation should apply,
> namely write clear code (*), then optimise the bottlenecks when you 
> actualy find you need to.

_Deliberately_ writing * instead of some constant is premature potential 
pessimisation and thus an utter nonsense. If you think 1 is obscure, 
then * is likewise obscure; write e.g. 'any_old_constant' instead.

> 
> *) for some definition of "clear code".
> 
>> My take is that it won't matter what you select if the optimiser is
>> smart enough; something that requires minimal resources to produce is
>> indicated in case the optimiser is dumb:
>>
>>  ... exists (select 1 from ... )
> 
> I have to maintain some code writen by someone who thinks replacing 
> "*" in queries with "1" is always a good idea (you know just in case), 
> he wrote: 
> 
>     	select count(1) from ...
> 
> of course it didn't do what he thought it did.

If you really have to maintain code that's been written by weird people 
and not subsequently tested, you have my sympathy. However this is not 
relevant. I am certainly not advocating bulk unthinking replacement of * 
by 1 anywhere in a query.

Cheers,
John



From python.list at tim.thechases.com  Wed May 13 19:39:03 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 13 May 2009 18:39:03 -0500
Subject: When *don't* I use 'self' in classes?
In-Reply-To: <rXHOl.41113$5N7.8212@newsfe09.iad>
References: <rXHOl.41113$5N7.8212@newsfe09.iad>
Message-ID: <4A0B5A17.9010708@tim.thechases.com>

Adam Gaskins wrote:
> I am a bit confused as too when, if ever, it is not appropriate to prepend 
> 'self' to objects in a class. All of the examples of how to use 'self' that 
> I find seem to be short and very simple (as examples tent to be). I 
> appologize if I am asking an ignorant question here, but I want to get off 
> on the right foot. Here's an example of what I mean:
> 
> import serial
> class foo:
>     def __init(self, comport):
>         self.comport = comport
>         self.baudrate = 9600 #default
>         self.ser = serial
>         try:
>             self.ser.Serial()
>             self.ser.baudrate = self.baudrate
>             self.ser.open()
>         except:
>             print 'Serial port could not be opened'
> 
> === OR ===
> import serial
> class foo:
>     def __init(self, comport):
>         self.comport = comport
>         self.baudrate = 9600 #default
>         try:
>             ser = serial.Serial()
>             ser.baudrate = self.baudrate
>             ser.open()
>         except:
>             print 'Serial port could not be opened'
> 
> There may be a typo in here,

Like "__init" instead of "__init__"? :)

> am importing a library do I still prepend it's object with self when I use 
> it in my class? I suppose my question is just basically... when do you NOT 
> prepent an object in a class with 'self'?

Use self.<attribute> when you want the resulting "ser" object to 
live beyond the __init__ call.  Easily seen in this example:

   class Foo:
     def __init__(self):
       self.abc = 42
       xyz = 3.141
       # xyz now falls out of scope

     def test_me(self):
       print self.abc  # succeeds and prints 42
       print xyz       # fails because "xyz" doesn't exist
                       # within this scope

   f = Foo()
   print dir(f)  # has an "abc" but not an "xyz"
   f.test_me()

So in your case, unless you *need* to keep the comport/baudrate 
around, I'd just use
-tim

  DEFAULT_BAUD = 9600
  class Foo:
    def __init__(self, comport):
      self.comport = comport
      try:
        self.ser = Serial()
        self.ser.baudrate = DEFAULT_BAUD
        self.ser.open()
      except SomeSpecificException:
        print "Fail!"

so that the .ser object is available in other method-calls.

-tkc







From steven at REMOVE.THIS.cybersource.com.au  Wed May 13 20:40:14 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 14 May 2009 00:40:14 GMT
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz>
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
	<pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>
	<gue19b$4no$1@lust.ihug.co.nz>
Message-ID: <pan.2009.05.14.00.40.15@REMOVE.THIS.cybersource.com.au>

On Wed, 13 May 2009 20:44:27 +1200, Lawrence D'Oliveiro wrote:

> In message <pan.2009.05.12.09.35.36 at REMOVE.THIS.cybersource.com.au>,
> Steven D'Aprano wrote:
> 
>> On Tue, 12 May 2009 09:20:36 +0000, Steven D'Aprano wrote:
>>
>>> It seems pretty straightforward to me.
>> 
>> Except of course such a pattern won't work ...
> 
> I rest my case.

Gosh, with such shallowness of analysis and out-of-context quoting, how 
could I possibly disagree? You've convinced me utterly.



-- 
Steven


From Graham.Dumpleton at gmail.com  Wed May 13 20:53:20 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Wed, 13 May 2009 17:53:20 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<12ef7b00-f0c5-4030-a353-533d93d23cdd@r3g2000vbp.googlegroups.com> 
	<794f117f-4df5-4c6c-be68-f901959b2579@y10g2000prc.googlegroups.com> 
	<d64eeab4-f07c-4f06-a70c-0c78278b2c2f@r34g2000vba.googlegroups.com> 
	<037bc6d0-3d2e-45bd-91d3-d3051fbfa149@s31g2000vbp.googlegroups.com>
Message-ID: <55f21331-72eb-4c60-a600-93ac563d1639@p6g2000pre.googlegroups.com>

On May 12, 1:59?am, dpapathanasiou <denis.papathanas... at gmail.com>
wrote:
> For the record, and in case anyone else runs into this particular
> problem, here's how resolved it.
>
> My original xml_utils.py was written this way:
>
> from xml.dom import minidom
>
> def parse_item_attribute (item, attribute_name):
> ? ? item_doc = minidom.parseString(item)
> ? ? ...
>
> That version worked under the python interpreter, but failed under
> both mod_python andmod_wsgiapache modules with an error ("Parent
> module 'xml.dom' not loaded").
>
> I found that changing the import statement and the minidom reference
> within the function resolved the problem.
>
> I.e., after rewriting xml_utils.py this way, it works under both
> apache modules as well as in the python interpreter:
>
> import xml.dom.minidom
>
> def parse_item_attribute (item, attribute_name):
> ? ? item_doc = xml.dom.minidom.parseString(item)
> ? ? ...

FWIW, have just seen someone else raising an issue where something
caused problems unless a full package path was used. In that case it
was the 'email' package.

The common thing between these two packages is that they do funny
stuff with sys.modules as part of import.

For 'email' package it is implementing some sort of lazy loader and
aliasing thing to support old names. For 'xml.dom' it seems to replace
the current module with a C extension variant on the fly if the C
extension exists.

Were you getting this issue with xml.dom showing on first request all
the time, or only occasionally occurring? If the latter, were you
running things in a multithreaded configuration and was the server
being loaded with lots of concurrent requests?

For your particular Python installation, does the '_xmlplus' module
exist? Ie., can you import it as '_xmlplus' or 'xml.doc._xmlplus'?

Graham


From jyoung79 at kc.rr.com  Wed May 13 21:18:48 2009
From: jyoung79 at kc.rr.com (jyoung79 at kc.rr.com)
Date: Wed, 13 May 2009 20:18:48 -0500
Subject: Extract EPS info?
Message-ID: <20090514011849.I5Q51.431775.root@hrndva-web02-z01>

Just curious if Python has a built-in module for pulling data out of an EPS 
file?  For example, I'd like to pull the text out of an EPS as well as the font
names of the characters of the text.  I believe I can pull all the font names
from the header area, but was hoping Python might have something
more robust.

Thanks.

Jay


From clp2 at rebertia.com  Wed May 13 22:06:59 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 13 May 2009 19:06:59 -0700
Subject: Proposal to Add New Method to List Object: Mutable Sequence Types
In-Reply-To: <926641.66419.qm@web8408.mail.in.yahoo.com>
References: <926641.66419.qm@web8408.mail.in.yahoo.com>
Message-ID: <50697b2c0905131906uc53562x5f046d60129f6e98@mail.gmail.com>

On Wed, May 13, 2009 at 1:55 AM, VenkataRamaKrishna Boddu
<bvrkchowdary at yahoo.co.in> wrote:
> Hi All,
>
> This is my first mail to python-list.
>
> I just want to propose the idea of introducing a new method for the List
> Object in similar lines of Dictionary Object has_key method.

has_key has been removed in Python 3.0; just use the `in` operator
instead. The `in` operator also works on lists.

Example use:
z = ["a", "b", "c"]
print("b" in z) #==> True
print("d" in z) #==> False

> See my below code, It always produces the ValueError, if I want to check
> whether an item is present or not, then they is no method in the List Object
> (do a "dir(list)").

You were looking for "__contains__"; it's called by the `in` operator.

Cheers,
Chris
-- 
http://blog.rebertia.com

> So., Is it not good, to have a method in List Object, may be something like
> has_item to check whether a item is present or not?
>
> #============== CODE ==============================
> partsOfMyName = ['Python', 'Perl', 'PHP', 'MySQL'];
> ## strSearchKey = 'Perl';
> strSearchKey = 'Prl';
>
> indexofKey = partsOfMyName.index(strSearchKey);
> print 'Index of search key: %s:? %d'%(strSearchKey, indexofKey);
>
> Thanks
> Venkata Rama Krishna Boddu
> ________________________________
> Explore and discover exciting holidays and getaways with Yahoo! India Travel
> Click here!
> --
> http://mail.python.org/mailman/listinfo/python-list


From chedderslam at gmail.com  Wed May 13 23:39:04 2009
From: chedderslam at gmail.com (chedderslam)
Date: Wed, 13 May 2009 20:39:04 -0700 (PDT)
Subject: please help with python program
Message-ID: <950c24b6-abc4-4846-9fb6-224c04399a88@r34g2000vba.googlegroups.com>

I am trying to use Album Cover Art Downloader, software someone
recommended to me.  It works fine on my work computer, but not at
home.

When I try to save the cover art, I get this error:
Traceback (most recent call last):

  File "lib/albumart\albumart_dialog.py", line 623, in
setCoverForItems

  File "lib/albumart\albumart.py", line 194, in setCover

  File "lib/albumart\albumart_target_windows.py", line 56, in setCover

  File "C:\Python24\lib\site-packages\PIL\Image.py", line 1399, in
save

IOError: [Errno 13] Permission denied: u'D:/My Music/Ani DiFranco/
Canon/Disc 1\\folder.jpg'

I have removed the read-only attribute on the folder, and added
"Everyone" with full control for security.  Not sure what else to do.
I would really like to get this working so any help would be
appreciated.

Thanks!


From steven at REMOVE.THIS.cybersource.com.au  Thu May 14 00:01:30 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 14 May 2009 04:01:30 GMT
Subject: please help with python program
References: <950c24b6-abc4-4846-9fb6-224c04399a88@r34g2000vba.googlegroups.com>
Message-ID: <pan.2009.05.14.04.01.30@REMOVE.THIS.cybersource.com.au>

On Wed, 13 May 2009 20:39:04 -0700, chedderslam wrote:

> IOError: [Errno 13] Permission denied: u'D:/My Music/Ani DiFranco/
> Canon/Disc 1\\folder.jpg'
> 
> I have removed the read-only attribute on the folder, and added
> "Everyone" with full control for security.  Not sure what else to do. I
> would really like to get this working so any help would be appreciated.

What about permissions on the file itself?



-- 
Steven


From cmpython at gmail.com  Thu May 14 00:03:47 2009
From: cmpython at gmail.com (CM)
Date: Wed, 13 May 2009 21:03:47 -0700 (PDT)
Subject: When *don't* I use 'self' in classes?
References: <rXHOl.41113$5N7.8212@newsfe09.iad>
Message-ID: <4306df92-dbac-4f75-9dee-8c1c81b06f71@r13g2000vbr.googlegroups.com>

On May 13, 6:36?pm, "Adam Gaskins" <agaskins... at kelleramerica.com>
wrote:
> I am a bit confused as too when, if ever, it is not appropriate to prepend
> 'self' to objects in a class. All of the examples of how to use 'self' that
> I find seem to be short and very simple (as examples tent to be). I
> appologize if I am asking an ignorant question here, but I want to get off
> on the right foot. Here's an example of what I mean:
>
> import serial
> class foo:
> ? ? def __init(self, comport):
> ? ? ? ? self.comport = comport
> ? ? ? ? self.baudrate = 9600 #default
> ? ? ? ? self.ser = serial
> ? ? ? ? try:
> ? ? ? ? ? ? self.ser.Serial()
> ? ? ? ? ? ? self.ser.baudrate = self.baudrate
> ? ? ? ? ? ? self.ser.open()
> ? ? ? ? except:
> ? ? ? ? ? ? print 'Serial port could not be opened'
>
> === OR ===
> import serial
> class foo:
> ? ? def __init(self, comport):
> ? ? ? ? self.comport = comport
> ? ? ? ? self.baudrate = 9600 #default
> ? ? ? ? try:
> ? ? ? ? ? ? ser = serial.Serial()
> ? ? ? ? ? ? ser.baudrate = self.baudrate
> ? ? ? ? ? ? ser.open()
> ? ? ? ? except:
> ? ? ? ? ? ? print 'Serial port could not be opened'
>
> There may be a typo in here, this is just a random example similar to
> something I'm working with, but which one of these are more 'proper'? If I
> am importing a library do I still prepend it's object with self when I use
> it in my class? I suppose my question is just basically... when do you NOT
> prepent an object in a class with 'self'?
>
> I'm not even sure I'm using the term 'object' correctly here. Feel free to
> set me straight, but I hope my example makes it clear what I am asking.
>
> Thanks a lot, this ng has already been super helpful as I take my
> crash-course in to python! :P

Others have said something like "use self prepended to an object if
you are
going to use it again".  I'd prefer to think of it more like "use self
prepended to an object if you'd like other functions to be able to
know
about that object.".  Is say this because you can have functions
called
over and over, and their contents "used again", but you still might
not
mind if their objects are local only to that function.

I just think of it that if I am going to need this object to be
generally
available to the whole class, I throw a self. on.  If not, I might not
bother.



From rent.lupin.road at gmail.com  Thu May 14 00:11:21 2009
From: rent.lupin.road at gmail.com (James)
Date: Wed, 13 May 2009 21:11:21 -0700 (PDT)
Subject: Distributed locking
Message-ID: <7addabf4-2b20-4be2-8d1b-cde6d0a04bb1@a5g2000pre.googlegroups.com>

Hey all, I'm looking for suggestions on how to tackle distributed
locking across several Python programs on several different machines.

- the objects to be locked are uniquely identified by an integer
- I need "one at a time" semantics for the lock: zero or one read-
writer at any point
- the operations to be performed on the objects are strictly limited
in duration (no more than 10 seconds)

As the operations have a maximum duration, my ideal solution would be
to lock the objects, and have them automatically unlock after some
time period even if the original lock-holder doesn't release them.

I'm currently playing with memcached as a locking mechanism as it's
simplicity and timeout fit my requirements well.

There is a check-and-set operation which atomically writes new data
iff the existing value hasn't been changed since we last looked.
However, their CAS operation doesn't handle the case of a non-existent
key..

Does anyone have suggestions on how I can do distributed locking to
take advantage of the time limit on operations?

Many thanks,
James


From wells at submute.net  Thu May 14 00:17:45 2009
From: wells at submute.net (Wells)
Date: Wed, 13 May 2009 21:17:45 -0700 (PDT)
Subject: Assigning multiple variables to a list a la php's list()
Message-ID: <032e2bae-b5c8-4e0d-a526-fa7d058fcc69@t10g2000vbg.googlegroups.com>

Can you take a list and have it exploded into variables w/ one
command? Something like..


list = ['foo', 'bar']
[a, b] = list

Then 'a' would be foo and 'b' 'bar'.

Like list($a,$b) = $list in PHP.

Thanks!


From clp2 at rebertia.com  Thu May 14 00:24:06 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 13 May 2009 21:24:06 -0700
Subject: Assigning multiple variables to a list a la php's list()
In-Reply-To: <032e2bae-b5c8-4e0d-a526-fa7d058fcc69@t10g2000vbg.googlegroups.com>
References: <032e2bae-b5c8-4e0d-a526-fa7d058fcc69@t10g2000vbg.googlegroups.com>
Message-ID: <50697b2c0905132124u6b79e3b5i549d41a3691d61f1@mail.gmail.com>

On Wed, May 13, 2009 at 9:17 PM, Wells <wells at submute.net> wrote:
> Can you take a list and have it exploded into variables w/ one
> command? Something like..
>
>
> list = ['foo', 'bar']
> [a, b] = list
>
> Then 'a' would be foo and 'b' 'bar'.

Did you think to try it at the interpreter? That exact syntax works,
though we usually write it without the brackets, like:

a, b = list

Also, don't use "list" as a variable name since it clashes with the
builtin type.

Cheers,
Chris
-- 
http://blog.rebertia.com


From mabdelkader at gmail.com  Thu May 14 00:39:35 2009
From: mabdelkader at gmail.com (ma)
Date: Thu, 14 May 2009 00:39:35 -0400
Subject: What's the use of the else in try/except/else?
In-Reply-To: <gu9fl8$nmh$1@reader1.panix.com>
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net> 
	<gu9fl8$nmh$1@reader1.panix.com>
Message-ID: <148918f0905132139m5f07e1a0u74297159247f661@mail.gmail.com>

A really great use for try/except/else would be if an object is
implementing its own __getitem__ method, so you would have something
like this:

class SomeObj(object):
    def __getitem__(self, key):
		try:
			#sometype of assertion here based on key type
		except AssertionError, e:
			raise TypeError, e #invalid type
		else:
			#continue processing, etc.. return some index, which will auto throw
			#an index error if you have some type of indexable datastructure


From steven at REMOVE.THIS.cybersource.com.au  Thu May 14 01:03:16 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 14 May 2009 05:03:16 GMT
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net>
	<gu9fl8$nmh$1@reader1.panix.com>
	<mailman.124.1242275998.8015.python-list@python.org>
Message-ID: <pan.2009.05.14.05.03.17@REMOVE.THIS.cybersource.com.au>

On Thu, 14 May 2009 00:39:35 -0400, ma wrote:

> A really great use for try/except/else would be if an object is
> implementing its own __getitem__ method, so you would have something
> like this:
> 
> class SomeObj(object):
>     def __getitem__(self, key):
> 		try:
> 			#sometype of assertion here based on key type
> 		except AssertionError, e:
> 			raise TypeError, e #invalid type

Why raise AssertionError only to catch it and raise TypeError? Why not 
just raise TypeError in the first place?


If you're thinking of writing this:

assert isinstance(key, whatever)

you should be aware that when Python is run with the -O flag (optimize), 
all asserts are disabled, and so your error checking code will not run 
and your program will crash and burn in a horrible flaming mess.


[steve at wow-wow ~]$ python -O
Python 2.5 (r25:51908, Nov  6 2007, 16:54:01)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> assert None is 2
>>>
>>>


The assert statement is not for runtime error checking. assert is for 
checking your program logic and invariants. If you've ever written a 
comment like:

# When we get here, then x will always be greater than 3.

(or something like that), that's a great candidate for an assertion:

assert x > 3, "x is unexpectedly less than or equal to three"


For error checking, you should do something like this:

if not isinstance(key, whatever):
    raise ValueError

rather than:

try:
    if not isinstance(key, whatever):
        raise AssertionError
except AssertionError:
    raise ValueError




-- 
Steven


From david.lyon at preisshare.net  Thu May 14 01:08:12 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Thu, 14 May 2009 01:08:12 -0400
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <4A0B4AA8.2090703@gmail.com>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>	<mailman.22.1242108050.8015.python-list@python.org>	<02oOl.710$wR5.489@nwrddc02.gnilink.net>	<mailman.65.1242174135.8015.python-list@python.org>	<4a0a3f40$0$24009$9b622d9e@news.freenet.de>
	<64fc05ead382d1a8490deb9a07bd5f01@preisshare.net>
	<4A0B4AA8.2090703@gmail.com>
Message-ID: <db3e4e7aa97e213db56a1ae954fc8935@preisshare.net>

On Thu, 14 May 2009 08:33:12 +1000, Mark Hammond <skippy.hammond at gmail.com>
wrote:

> But if PYTHONPATH was set incorrectly it really doesn't matter how 
> Python was installed, it would still fail.  The installer didn't set 
> PYTHONPATH, a human did.

Hi Mark,

Well I am just trying to write a package manager for python because
I felt spoiled on my last platform, perl. When I came to python I found 
a bit primitive in python under windows in comparison. I felt like
starting to write something that might be useful..

I've personally used your packages at work and find them useful. 

At the same time it is a very interesting learning process about python
and how it works..

Best Regards

David




From mabdelkader at gmail.com  Thu May 14 01:19:50 2009
From: mabdelkader at gmail.com (ma)
Date: Thu, 14 May 2009 01:19:50 -0400
Subject: What's the use of the else in try/except/else?
In-Reply-To: <pan.2009.05.14.05.03.17@REMOVE.THIS.cybersource.com.au>
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net> 
	<gu9fl8$nmh$1@reader1.panix.com>
	<mailman.124.1242275998.8015.python-list@python.org> 
	<pan.2009.05.14.05.03.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <148918f0905132219x4873e7eewd15de6ccef4333fd@mail.gmail.com>

That's great to know! Thanks for that explanation, I am refactoring
something and I was going to make ample use of assertion as I thought
it was the same as C's assertion without the NDEBUG flag.


On Thu, May 14, 2009 at 1:03 AM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
> On Thu, 14 May 2009 00:39:35 -0400, ma wrote:
>
>> A really great use for try/except/else would be if an object is
>> implementing its own __getitem__ method, so you would have something
>> like this:
>>
>> class SomeObj(object):
>> ? ? def __getitem__(self, key):
>> ? ? ? ? ? ? ? try:
>> ? ? ? ? ? ? ? ? ? ? ? #sometype of assertion here based on key type
>> ? ? ? ? ? ? ? except AssertionError, e:
>> ? ? ? ? ? ? ? ? ? ? ? raise TypeError, e #invalid type
>
> Why raise AssertionError only to catch it and raise TypeError? Why not
> just raise TypeError in the first place?
>
>
> If you're thinking of writing this:
>
> assert isinstance(key, whatever)
>
> you should be aware that when Python is run with the -O flag (optimize),
> all asserts are disabled, and so your error checking code will not run
> and your program will crash and burn in a horrible flaming mess.
>
>
> [steve at wow-wow ~]$ python -O
> Python 2.5 (r25:51908, Nov ?6 2007, 16:54:01)
> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> assert None is 2
>>>>
>>>>
>
>
> The assert statement is not for runtime error checking. assert is for
> checking your program logic and invariants. If you've ever written a
> comment like:
>
> # When we get here, then x will always be greater than 3.
>
> (or something like that), that's a great candidate for an assertion:
>
> assert x > 3, "x is unexpectedly less than or equal to three"
>
>
> For error checking, you should do something like this:
>
> if not isinstance(key, whatever):
> ? ?raise ValueError
>
> rather than:
>
> try:
> ? ?if not isinstance(key, whatever):
> ? ? ? ?raise AssertionError
> except AssertionError:
> ? ?raise ValueError
>
>
>
>
> --
> Steven
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From daved170 at gmail.com  Thu May 14 02:57:02 2009
From: daved170 at gmail.com (daved170)
Date: Wed, 13 May 2009 23:57:02 -0700 (PDT)
Subject: PythonCard - My app stuck when button clicked
References: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>
	<mailman.96.1242236574.8015.python-list@python.org>
Message-ID: <a01f1519-707d-4056-b34a-b1858c1d60e4@n4g2000vba.googlegroups.com>

On May 13, 7:42?pm, Dave Angel <da... at ieee.org> wrote:
> daved170 wrote:
> > Hi there,
> > I'm newbie in pythonCard.
> > I have an application with 2 buttons : START , STOP
> > Start execute a while(1) loop that execute my calculations.
> > Stop suppose to raise a flag that will end that loop.
>
> > Whenever I pish the START button my GUI is stuck. the calculation
> > executes but I can't push the STOP button.
>
> > I added thread that START start a thread that execute my calculations.
> > I also added a Global variable that will hold the indication if the
> > loop should continue.
> > The problem now is that the thread ignore that variable and loop
> > forever.
>
> > Is there a simple way to make sure that the GUI won't stuck (without
> > threads)?
> > And if there isn't such way I would appriciet it very much if anyone
> > could post an example of how to make my thread read that variable
> > Thanks
> > Dave
>
> I don't know PythonCard, but most GUI's are similar enough that the
> concepts will work, even though the details differ. ?I'll assume that
> PythonCard has a traditional event loop, from which all events are
> dispatched.
>
> If your loop is fairly small, then you should keep it to one thread. ?
> Debugging it will usually be much easier. ?The trick is to break the
> task into pieces (each piece might be once around what is now a loop),
> and invoke one piece each time the event loop empties. ?I can't tell you
> how to do that without seeing your loop, but it's not usually very hard.
>
> Now, there is some way of POSTing an event to the event loop. ?That puts
> the event *after* all the events that are already there, but returns
> control immediately. ?So create a custom event, and POST it from the
> START button's button-pressed event. ?That will fire off one "loop" of
> the special task, in other words, make one function call to your new
> function. ?Then at the end of the function, POST it again, unless the
> STOP button has been pressed in the meantime.
>
> An optimization for this is to use coroutines, which are usually done
> with a generator. ?It's much trickier to describe, but much easier to
> accomplish. ?Roughly, you'd take your existing loop, and put a yield
> statement in it at appropriate place(s). ?Then the custom event is
> simply a call to the .next() function of that generator.
>
> Now, threading isn't that tough either, depending on how much data is
> being shared between the thread and the main program. ?You say that
> sharing a global flag isn't working, but it should. ?So how about if you
> show us some code, and somebody'll spot the trouble. ?For example, is
> the thread defined in the same module as the App? ?Global only shares
> between a single module. ?Another reason globals might seem to fail is
> if you tried to do mutual imports between two or more modules. ?(A
> imports B, which imports A). ?Sometimes that fails in mysterious ways.
>
> Make a simple (stripped) example of what you're trying, and we'll try to
> find the problem. ?Without concrete code, we end up with ambiguities
> like the above usage of two different meanings for "the loop."- Hide quoted text -
>
> - Show quoted text -

Thank's Dave,
Here my code, It's a very simple app. the Start button starts a TCP/IP
communication and the Stop should dtop it and kill the client.
I'll be thankful if you'll be able to spot my mistake.
Thanks again
Dave

#Global Variable
bStopLoop = False

#Global Function
def execute(sockObj):
   while(!bStopLoop):
      str = sockObj.recv(1024)
      tmpStr = "Hello " + str
      sockObj.send(tmpStr)

#Thread handle class
class myThread(threading.Thread):
   def __init__(self,sockObj):
      threading.Thread.__init__(self)
      bStopLoop = False
      self.sockObj = sockObj

   def run(self):
      execute(self.SockObj)

# GUI
class GUI(model.Background)

   def on_Start_mouseclick(self,event):
   try:
      event.target.enable = False
      event.target.redraw()
      self.components.Start.enable = False
      self.currThread = myThread(self.sockObj)
      self.currThread.Start()
      wx.SafeYield(self)
      self.components.Start.enable = True
   except:
      .....

   def on_Stop_mouseclick(self,event):
      bStopLoop = True


From andreengels at gmail.com  Thu May 14 03:08:24 2009
From: andreengels at gmail.com (Andre Engels)
Date: Thu, 14 May 2009 09:08:24 +0200
Subject: What's the use of the else in try/except/else?
In-Reply-To: <148918f0905132139m5f07e1a0u74297159247f661@mail.gmail.com>
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net>
	<gu9fl8$nmh$1@reader1.panix.com>
	<148918f0905132139m5f07e1a0u74297159247f661@mail.gmail.com>
Message-ID: <6faf39c90905140008v6cd54b6crb23b9f23578fa05f@mail.gmail.com>

On Thu, May 14, 2009 at 6:39 AM, ma <mabdelkader at gmail.com> wrote:
> A really great use for try/except/else would be if an object is
> implementing its own __getitem__ method, so you would have something
> like this:
>
> class SomeObj(object):
> ? ?def __getitem__(self, key):
> ? ? ? ? ? ? ? ?try:
> ? ? ? ? ? ? ? ? ? ? ? ?#sometype of assertion here based on key type
> ? ? ? ? ? ? ? ?except AssertionError, e:
> ? ? ? ? ? ? ? ? ? ? ? ?raise TypeError, e #invalid type
> ? ? ? ? ? ? ? ?else:
> ? ? ? ? ? ? ? ? ? ? ? ?#continue processing, etc.. return some index, which will auto throw
> ? ? ? ? ? ? ? ? ? ? ? ?#an index error if you have some type of indexable datastructure

Again, this is a case where no else is needed. Whenever you raise
something in the except clause (as your only exit point), it would
work just as well (though it might be a bit uglier) to put the rest
after the try ... except without an else. It is when after the
exception execution continues normally, but skipping part of the code,
that you need an else.


-- 
Andr? Engels, andreengels at gmail.com


From gagsl-py2 at yahoo.com.ar  Thu May 14 03:13:01 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 14 May 2009 04:13:01 -0300
Subject: HTTP HEAD and docxmlrpcserver
References: <4d9b53db0905110023r6d92d0dcx4135603713295a02@mail.gmail.com>
Message-ID: <op.utwrnzhbx6zn5v@lepton.softlabbsas.com.ar>

En Mon, 11 May 2009 04:23:29 -0300, Christopher Mahan  
<chris.mahan at gmail.com> escribi?:

> I have a docxmlrpcserver install (kissws.com) that's returning HTTP code  
> 501
> when the client makes a HEAD request.
>
> Any idea as to whether that's by design?

Yes. The XMLRPC spec defines only the POST request; DocXMLRPCServer  
extends the definition so a GET request is interpreted as a documentation  
query. Any other method remains undefined and generates a "501 Unsupported  
method (xxx)" response.

If you do need HEAD, extend DocXMLRPCRequestHandler to define a do_HEAD  
method (same as do_GET but without actually sending the response entity).

-- 
Gabriel Genellina



From chris.mahan at gmail.com  Thu May 14 03:29:36 2009
From: chris.mahan at gmail.com (Christopher Mahan)
Date: Thu, 14 May 2009 00:29:36 -0700
Subject: HTTP HEAD and docxmlrpcserver
In-Reply-To: <op.utwrnzhbx6zn5v@lepton.softlabbsas.com.ar>
References: <4d9b53db0905110023r6d92d0dcx4135603713295a02@mail.gmail.com>
	<op.utwrnzhbx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4d9b53db0905140029je056a78lfa340a6bbfc3347b@mail.gmail.com>

On Thu, May 14, 2009 at 12:13 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Mon, 11 May 2009 04:23:29 -0300, Christopher Mahan <
> chris.mahan at gmail.com> escribi?:
>
>  I have a docxmlrpcserver install (kissws.com) that's returning HTTP code
>> 501
>> when the client makes a HEAD request.
>>
>> Any idea as to whether that's by design?
>>
>
> Yes. The XMLRPC spec defines only the POST request; DocXMLRPCServer extends
> the definition so a GET request is interpreted as a documentation query. Any
> other method remains undefined and generates a "501 Unsupported method
> (xxx)" response.
>
> If you do need HEAD, extend DocXMLRPCRequestHandler to define a do_HEAD
> method (same as do_GET but without actually sending the response entity).
>
> --
> Gabriel Genellina
>


Thank you.

Chris Mahan
chris.mahan at gmail.com
gv (818) 671-1709
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From deets at nospam.web.de  Thu May 14 03:34:23 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 14 May 2009 09:34:23 +0200
Subject: Distributed locking
In-Reply-To: <7addabf4-2b20-4be2-8d1b-cde6d0a04bb1@a5g2000pre.googlegroups.com>
References: <7addabf4-2b20-4be2-8d1b-cde6d0a04bb1@a5g2000pre.googlegroups.com>
Message-ID: <771vrvF1f4gbkU1@mid.uni-berlin.de>

James schrieb:
> Hey all, I'm looking for suggestions on how to tackle distributed
> locking across several Python programs on several different machines.
> 
> - the objects to be locked are uniquely identified by an integer
> - I need "one at a time" semantics for the lock: zero or one read-
> writer at any point
> - the operations to be performed on the objects are strictly limited
> in duration (no more than 10 seconds)
> 
> As the operations have a maximum duration, my ideal solution would be
> to lock the objects, and have them automatically unlock after some
> time period even if the original lock-holder doesn't release them.
> 
> I'm currently playing with memcached as a locking mechanism as it's
> simplicity and timeout fit my requirements well.
> 
> There is a check-and-set operation which atomically writes new data
> iff the existing value hasn't been changed since we last looked.
> However, their CAS operation doesn't handle the case of a non-existent
> key..
> 
> Does anyone have suggestions on how I can do distributed locking to
> take advantage of the time limit on operations?

I'd use a database. Maybe the time limit could be modeled with a 
transaction-timeout, but even if not, you should be able to model a 
solution with timestamps and distinct transactions to modify the locked row.

Also, for the case of the non-existing lock, go with something like this:


if not lock_exists(my_lock):
    lock_locks_table()
    if not lock_exists(my_lock):
       create_lock(my_lock)

with my_lock:
     ...


In the __enter__ and __exit__-methods of my_lock, you can perfom the 
necessary database-ops.


Diez


From mail at timgolden.me.uk  Thu May 14 03:49:28 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 14 May 2009 08:49:28 +0100
Subject: please help with python program
In-Reply-To: <950c24b6-abc4-4846-9fb6-224c04399a88@r34g2000vba.googlegroups.com>
References: <950c24b6-abc4-4846-9fb6-224c04399a88@r34g2000vba.googlegroups.com>
Message-ID: <4A0BCD08.9070500@timgolden.me.uk>

chedderslam wrote:
> IOError: [Errno 13] Permission denied: u'D:/My Music/Ani DiFranco/
> Canon/Disc 1\\folder.jpg'
> 
> I have removed the read-only attribute on the folder, and added
> "Everyone" with full control for security.  Not sure what else to do.
> I would really like to get this working so any help would be
> appreciated.

FWIW, read-only on a folder has no appreciable effect. It's generally
used by the Windows shell to indicate that the folder is "special"
(eg My Documents, My Music etc). It doesn't stop you writing files
in that directory.

Not sure how much Windows-fu you have, so apols if any of
this is teaching my grandmother to suck eggs...

I'm not familiar with the app you mention but make sure that the
user it's running under (which may be your own) has permissions
to write the file you're trying to save in the location in
question. Ie, as that user, do this in Python:

  open (u'D:/My Music/Ani DiFranco/Canon/Disc 1\\folder.jpg', "w")

to see if you get the same result. If you do, access the [Security]
tab on the folder itself, select [Advanced] and then the 
[Effective Permissions] tab to make sure what the permissions
really are. As a rule, "My xxx" folders tend to have more 
restrictive permissions as they are tied to a specific user.
This only matters, obviously, if the app is not running as
your own user.

TJG


From gagsl-py2 at yahoo.com.ar  Thu May 14 04:29:47 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 14 May 2009 05:29:47 -0300
Subject: Skipping unit tests
References: <f1mld6-v1j.ln1@satorlaser.homedns.org>
Message-ID: <op.utwu7x17x6zn5v@lepton.softlabbsas.com.ar>

En Mon, 11 May 2009 10:33:03 -0300, Ulrich Eckhardt  
<eckhardt at satorlaser.com> escribi?:

> We have a few tests for some module here. These tests are under  
> development
> and applied to older versions (with less features) of the module, too.  
> That
> means that if I have module version 42, tests A and B can not possibly
> work. I don't want to have test failures but I also don't want to fork  
> the
> test suite, so how do I get the tests to behave like Python's test suite,
> which also skips some "expected failures".

The simplest way would be to check for some condition (code version,  
attribute existence) in the tests themselves, and just skip it when it's  
not apropiate.

Another way is to omit the test case from the suite. Things can be a lot  
fancier... Look at the Python test suite for some ideas.

-- 
Gabriel Genellina



From mail at timgolden.me.uk  Thu May 14 04:40:04 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 14 May 2009 09:40:04 +0100
Subject: about Python doc reader
In-Reply-To: <OFFDBE2295.8C083EB0-ON652575B6.002E9D9C-652575B6.002ECDA9@tcs.com>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>	<4A0AC4C7.1060000@timgolden.me.uk>
	<OFFDBE2295.8C083EB0-ON652575B6.002E9D9C-652575B6.002ECDA9@tcs.com>
Message-ID: <4A0BD8E4.9070603@timgolden.me.uk>

[forwarding back to the list]
Please reply to the list: I'm not the only person
who can help, and I might not have the time even
if I can.

Shailja Gulati wrote:
> I have installed win32com but still not able to run tht code as its giving 
> error 
> 
>   File "readDocPython.py", line 1, in ?
>     import win32com.client
>   File "C:\pywin32-212\com\win32com\__init__.py", line 5, in ?
>     import win32api, sys, os
> ImportError: No module named win32api

 >
 > i have even installed win32api.dll in Sytsem folder but
 >  still can't do t.Any further help??

I don't know how you've installed it, but I really don't expect
to see it in c:\pywin32-212.... Download *and run* the
.exe installer, from here, choosing the one which corresponds
to your Python installation?

http://sourceforge.net/project/platformdownload.php?group_id=78018

Don't try to download the source -- the zip -- and add it to 
sys.path, which is the only thing I can imagine you've done there.


TJG


From grant_ito at shaw.ca  Thu May 14 04:49:39 2009
From: grant_ito at shaw.ca (Grant Ito)
Date: Thu, 14 May 2009 08:49:39 GMT
Subject: Question: Running Python programs in KDE
Message-ID: <DWQOl.45106$Jc3.20824@newsfe16.iad>

Hello.

Silly question here. I'd like to find out how to create an icon in KDE to 
run my Python scripts. Specs are as follows:

KDE version 4.1.3 in OpenSuse 11.1.
Some scripts have output to Konsole window, others use Tkinter.

Thanks in advance,
Grant.


From shailja.gulati at tcs.com  Thu May 14 04:49:58 2009
From: shailja.gulati at tcs.com (Shailja Gulati)
Date: Thu, 14 May 2009 14:19:58 +0530
Subject: about Python doc reader
Message-ID: <OF99ECE460.C56AFE3A-ON652575B6.003014AE-652575B6.00304041@tcs.com>

[forwarding back to the list]
Please reply to the list: I'm not the only person
who can help, and I might not have the time even
if I can.

Shailja Gulati wrote:
> I have installed win32com but still not able to run tht code as its 
giving 
> error 
> 
>   File "readDocPython.py", line 1, in ?
>     import win32com.client
>   File "C:\pywin32-212\com\win32com\__init__.py", line 5, in ?
>     import win32api, sys, os
> ImportError: No module named win32api

 >
 > i have even installed win32api.dll in Sytsem folder but
 >  still can't do t.Any further help??

I don't know how you've installed it, but I really don't expect
to see it in c:\pywin32-212.... Download *and run* the
.exe installer, from here, choosing the one which corresponds
to your Python installation?


Sorry about mailing u Tim.It just happened by mistake.

Reg win32api , i m still facing the same problem of Import error...Could 
anyone pls help?? m stuck

http://sourceforge.net/project/platformdownload.php?group_id=78018

Don't try to download the source -- the zip -- and add it to 
sys.path, which is the only thing I can imagine you've done there.


TJG
-- 
http://mail.python.org/mailman/listinfo/python-list

ForwardSourceID:NT0000EC7A 
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From svarovsky.tomas at gmail.com  Thu May 14 05:00:50 2009
From: svarovsky.tomas at gmail.com (Tomas Svarovsky)
Date: Thu, 14 May 2009 02:00:50 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com>
Message-ID: <3ec026dc-f0f0-4554-844a-bf596d639d1d@e24g2000vbe.googlegroups.com>

On May 13, 4:55?pm, cgoldberg <cgoldb... at gmail.com> wrote:
> > Bascally it just grabs a page xy
> > times and tells me how long it took.
>
> you aren't doing a read(), so technically you are just connecting to
> the web server and sending the request but never reading the content
> back from the socket. ?So your timing wouldn't be accurate.
>
> try this instead:
> response = urllib2.urlopen(req).read()
>
> But that is not the problem you are describing...

Thanks for this pointer, didn't come to my mind.

> > when I increase the number of repetitions, it is
> > slowing down considerably (1 is like 3 ms, 100 takes 6 seconds).
> > Maybe it is a known issue in urllib2
>
> I ran your code and can not reproduce that behavior. ?No matter how
> many repetitions, I still get a similar response time per transaction.
>
> any more details or code samples you can provide?
>

I don;t know, I have tried the program on my local MacOs, where I have
several python runtimes installed and there is huge dfference between
result after running at 2.6 and 2.4. So this might be the problem.
When ran on the 2.6 result are comparable to php and better than ruby,
which is what I expect.

The problem is, that CentOS is running on the server and there is only
2.4 available. On wich version did you ran these tests?

Thanks

> -Corey Goldberg



From deets at nospam.web.de  Thu May 14 05:05:00 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 14 May 2009 11:05:00 +0200
Subject: Question: Running Python programs in KDE
References: <DWQOl.45106$Jc3.20824@newsfe16.iad>
Message-ID: <77252bF1eq21lU1@mid.uni-berlin.de>

Grant Ito wrote:

> Hello.
> 
> Silly question here. I'd like to find out how to create an icon in KDE to
> run my Python scripts. Specs are as follows:
> 
> KDE version 4.1.3 in OpenSuse 11.1.
> Some scripts have output to Konsole window, others use Tkinter.
> 
> Thanks in advance,
> Grant.

Try right mouseclick over the desktop. Follow the context-menu.

Diez


From mail at timgolden.me.uk  Thu May 14 05:08:23 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 14 May 2009 10:08:23 +0100
Subject: about Python doc reader
In-Reply-To: <OF99ECE460.C56AFE3A-ON652575B6.003014AE-652575B6.00304041@tcs.com>
References: <OF99ECE460.C56AFE3A-ON652575B6.003014AE-652575B6.00304041@tcs.com>
Message-ID: <4A0BDF87.9080101@timgolden.me.uk>

Shailja Gulati wrote:
> Sorry about mailing u Tim.It just happened by mistake.
> 
> Reg win32api , i m still facing the same problem of Import error...Could 
> anyone pls help?? m stuck

Shailja. Did you download and install the download .exe
from the link below?

> 
> http://sourceforge.net/project/platformdownload.php?group_id=78018


TJG


From shailja.gulati at tcs.com  Thu May 14 05:33:06 2009
From: shailja.gulati at tcs.com (Shailja Gulati)
Date: Thu, 14 May 2009 15:03:06 +0530
Subject: Fw: about Python doc reader
Message-ID: <OFAD9C1240.B2FC58CC-ON652575B6.0033EB3D-652575B6.00343315@tcs.com>

Shailja Gulati wrote:
> Sorry about mailing u Tim.It just happened by mistake.
> 
> Reg win32api , i m still facing the same problem of Import error...Could 

> anyone pls help?? m stuck

Shailja. Did you download and install the download .exe
from the link below?


yeah..I have installed it from the same link earlier..bt getting the 
Import error ...

Anyways i have got an alternate solution as

1.first convert doc to .txt file with free doc to text converter.I have 
used "Antiword"  software for this.
2. Python can easily read this txt file and process tabular data also.

so hoping tht problem will be solved.

thanks for ur help.


> 
> http://sourceforge.net/project/platformdownload.php?group_id=78018


TJG
-- 
http://mail.python.org/mailman/listinfo/python-list

ForwardSourceID:NT0000EC9E 
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confidential or privileged information. If you are 
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From svarovsky.tomas at gmail.com  Thu May 14 05:33:29 2009
From: svarovsky.tomas at gmail.com (Tomas Svarovsky)
Date: Thu, 14 May 2009 02:33:29 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com> 
	<3ec026dc-f0f0-4554-844a-bf596d639d1d@e24g2000vbe.googlegroups.com>
Message-ID: <cdb853e6-7cce-4a0d-ac45-b31a29563e8d@x6g2000vbg.googlegroups.com>

One more thing, since I am stuck with 2.4 (and if this is really 2.4
issue), is there some substitution for urllib2?

On May 14, 11:00?am, Tomas Svarovsky <svarovsky.to... at gmail.com>
wrote:
> On May 13, 4:55?pm, cgoldberg <cgoldb... at gmail.com> wrote:
>
> > > Bascally it just grabs a page xy
> > > times and tells me how long it took.
>
> > you aren't doing a read(), so technically you are just connecting to
> > the web server and sending the request but never reading the content
> > back from the socket. ?So your timing wouldn't be accurate.
>
> > try this instead:
> > response = urllib2.urlopen(req).read()
>
> > But that is not the problem you are describing...
>
> Thanks for this pointer, didn't come to my mind.
>
> > > when I increase the number of repetitions, it is
> > > slowing down considerably (1 is like 3 ms, 100 takes 6 seconds).
> > > Maybe it is a known issue in urllib2
>
> > I ran your code and can not reproduce that behavior. ?No matter how
> > many repetitions, I still get a similar response time per transaction.
>
> > any more details or code samples you can provide?
>
> I don;t know, I have tried the program on my local MacOs, where I have
> several python runtimes installed and there is huge dfference between
> result after running at 2.6 and 2.4. So this might be the problem.
> When ran on the 2.6 result are comparable to php and better than ruby,
> which is what I expect.
>
> The problem is, that CentOS is running on the server and there is only
> 2.4 available. On wich version did you ran these tests?
>
> Thanks
>
> > -Corey Goldberg



From R.Brodie at rl.ac.uk  Thu May 14 05:57:45 2009
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Thu, 14 May 2009 10:57:45 +0100
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com>
Message-ID: <gugpup$1r7$1@south.jnrs.ja.net>


"cgoldberg" <cgoldberg at gmail.com> wrote in message 
news:9ae58862-1cb2-4981-ae6a-0428c7684feb at z5g2000vba.googlegroups.com...

> you aren't doing a read(), so technically you are just connecting to
> the web server and sending the request but never reading the content
> back from the socket.
>
> But that is not the problem you are describing...

It might be, if the local server doesn't scale well enough to handle
100 concurrent requests. 




From greg.ewing at canterbury.ac.nz  Thu May 14 06:00:29 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Thu, 14 May 2009 22:00:29 +1200
Subject: 2nd Pyggy Awards Open
Message-ID: <4A0BEBBD.5070900@canterbury.ac.nz>

The Second Pyggy Awards is now open for entries.

   http://pyggy.pyweek.org/1008/

Judging will be held in the first two weeks of
August 2009.

Once again, the event is open to games from any
previous PyWeek competition.

You may also submit a game that you were intending
to enter in PyWeek 8 but didn't finish.

(It seems that some people decided not to enter their
unfinished games in PyWeek, hoping to make them Pyggy
entries instead. I'll allow that this time, but in
future it would be better to submit whatever you've
got at the end of PyWeek. You can still make a backup
PyWeek entry as well if you want.)

-- 
Greg


From svarovsky.tomas at gmail.com  Thu May 14 06:10:51 2009
From: svarovsky.tomas at gmail.com (Tomas Svarovsky)
Date: Thu, 14 May 2009 03:10:51 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com> 
	<gugpup$1r7$1@south.jnrs.ja.net>
Message-ID: <747b0d4f-f9fd-4fa6-bb6d-0a4365f328ba@b1g2000vbc.googlegroups.com>

On May 14, 11:57?am, "Richard Brodie" <R.Bro... at rl.ac.uk> wrote:
> "cgoldberg" <cgoldb... at gmail.com> wrote in message
>
> news:9ae58862-1cb2-4981-ae6a-0428c7684feb at z5g2000vba.googlegroups.com...
>
> > you aren't doing a read(), so technically you are just connecting to
> > the web server and sending the request but never reading the content
> > back from the socket.
>
> > But that is not the problem you are describing...
>
> It might be, if the local server doesn't scale well enough to handle
> 100 concurrent requests.

This is a good point, but then it would manifest regardless of the
language used AFAIK. And this is not the case, ruby and php
implementations are working quite fine.

Thanks for reply


From antroy at gmail.com  Thu May 14 07:41:27 2009
From: antroy at gmail.com (Ant)
Date: Thu, 14 May 2009 04:41:27 -0700 (PDT)
Subject: matplotlib - overlaying plots.
Message-ID: <fb29579e-4229-4d99-8ed7-201099ee8595@r36g2000vbr.googlegroups.com>

Hi All,

I am trying to get matplotlib to overlay a couple of graphs, but am
getting nowhere. I originally thought that the following may work:

>>> x = [1,2,3,4,5]
>>> y = [2,4,6,8,10]
>>> y2 = [1,4,9,16,25]

>>> plot(x, y)
>>> plot(x, y2)

Now this works as desired, however, the actual case I have is more
like this:

>>> x = [1,2,3,4,5]
>>> y = [2,4,6,8,10]
>>> y2 = [.0001, .0002, .0003, .0004, .0005]

Now the graph is useless, since the results are plotted on the same
axis. What I really want is two different sets of axes, each scaled
appropriately, but overlayed.

The data I actually have, is one set of axes plotting distance against
elevation, and a second plotting distance against speed. The former
has (y-coord) units in the range 0-2000 ft and the latter 0 - 0.01
miles/second. I want them on the same graph, so points can be easily
correlated, but overlayed so that each line has a different scale on
the y-axis. The closest I can get is to have two subplots, one above
the other.

Thanks in advance,

Ant.



From ldo at geek-central.gen.new_zealand  Thu May 14 07:42:07 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 14 May 2009 23:42:07 +1200
Subject: (Windows) Finding out which process has locked a file.
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
Message-ID: <guh02f$re4$2@lust.ihug.co.nz>

In message <787d6072-3381-40bd-
af20-8e1a40405033 at h23g2000vbc.googlegroups.com>, CinnamonDonkey wrote:

> I have a script running which occa[s]ionally fails because it is trying
> to delete a file in use by another process. When this happens I want
> it to log which process has the lock.

Maybe there is no such process. Maybe it's just the Dimdows filesystem 
randomly returning a failure on its own. How would you know?



From dikkie at nospam.org  Thu May 14 07:56:53 2009
From: dikkie at nospam.org (Dikkie Dik)
Date: Thu, 14 May 2009 13:56:53 +0200
Subject: Nimrod programming language
In-Reply-To: <57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
References: <mailman.5356.1241924167.11746.python-list@python.org>
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
Message-ID: <4a0c0528$0$28250$bf4948fe@news.tele2.nl>


> 3) Most text files have no header specifying the encoding anyway. How
> should the programm/programmer know? And often he does not need to
> know anyway.


What? Off COURSE texts have no header stating the encoding! And it is
the programmer's responsibility to know what a text's encoding is. So do
not ignore HTTP headers when downloading or other means of communicating
the encoding.

That is the whole problem with texts represented as strings. A string is
a free sequence of bytes, whereas a text is a free sequence of
characters WITH AN ENCODING. This may be a default encoding, but you
must still know which one that is. That is your JOB as a programmer.

Putting the encoding as some sort of header in the string itself is the
worst "solution" that has ever been proposed. Do you put the only key to
a safe inside the very same safe and lock it? Then why do you have to
hack a string (is is not a text as it is not accompanied by an encoding)
to see what encoding is hidden inside?

Ask yourself: would the following "headers" ever work (each given in the
stated encoding off course)?

<meta http-equiv="Content-type" Value="text/html;charset=iso-8859-1">
<meta http-equiv="Content-type" Value="text/html;charset=utf-8">
<meta http-equiv="Content-type" Value="text/html;charset=utf-7">
<meta http-equiv="Content-type" Value="text/html;charset=utf-16">
<meta http-equiv="Content-type" Value="text/html;charset=utf-32">
<meta http-equiv="Content-type" Value="text/html;charset=ebcdic">


From flamz3d at gmail.com  Thu May 14 08:32:25 2009
From: flamz3d at gmail.com (flamz3d at gmail.com)
Date: Thu, 14 May 2009 05:32:25 -0700 (PDT)
Subject: introspection question: get return type
Message-ID: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>

Hello,
I am wondering if it's possible to get the return value of a method
*without* calling it using introspection?

something like this, suppose I want to know the type of the return
value for the method "getsomething". Is it possible to get it without
actually calling 'getsomething'?

ex:
import mystuff
print dir (mystuff.getsomething)




From davea at ieee.org  Thu May 14 08:37:19 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 14 May 2009 08:37:19 -0400
Subject: PythonCard - My app stuck when button clicked
In-Reply-To: <a01f1519-707d-4056-b34a-b1858c1d60e4@n4g2000vba.googlegroups.com>
References: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>	<mailman.96.1242236574.8015.python-list@python.org>
	<a01f1519-707d-4056-b34a-b1858c1d60e4@n4g2000vba.googlegroups.com>
Message-ID: <4A0C107F.1060302@ieee.org>

daved170 wrote:
> On May 13, 7:42 pm, Dave Angel <da... at ieee.org> wrote:
>   
>> daved170 wrote:
>>     
>>> Hi there,
>>> I'm newbie in pythonCard.
>>> I have an application with 2 buttons : START , STOP
>>> Start execute a while(1) loop that execute my calculations.
>>> Stop suppose to raise a flag that will end that loop.
>>>       
>>> Whenever I pish the START button my GUI is stuck. the calculation
>>> executes but I can't push the STOP button.
>>>       
>>> I added thread that START start a thread that execute my calculations.
>>> I also added a Global variable that will hold the indication if the
>>> loop should continue.
>>> The problem now is that the thread ignore that variable and loop
>>> forever.
>>>       
>>> Is there a simple way to make sure that the GUI won't stuck (without
>>> threads)?
>>> And if there isn't such way I would appriciet it very much if anyone
>>> could post an example of how to make my thread read that variable
>>> Thanks
>>> Dave
>>>       
>> I don't know PythonCard, but most GUI's are similar enough that the
>> concepts will work, even though the details differ.  I'll assume that
>> PythonCard has a traditional event loop, from which all events are
>> dispatched.
>>
>> If your loop is fairly small, then you should keep it to one thread.  
>> Debugging it will usually be much easier.  The trick is to break the
>> task into pieces (each piece might be once around what is now a loop),
>> and invoke one piece each time the event loop empties.  I can't tell you
>> how to do that without seeing your loop, but it's not usually very hard.
>>
>> Now, there is some way of POSTing an event to the event loop.  That puts
>> the event *after* all the events that are already there, but returns
>> control immediately.  So create a custom event, and POST it from the
>> START button's button-pressed event.  That will fire off one "loop" of
>> the special task, in other words, make one function call to your new
>> function.  Then at the end of the function, POST it again, unless the
>> STOP button has been pressed in the meantime.
>>
>> An optimization for this is to use coroutines, which are usually done
>> with a generator.  It's much trickier to describe, but much easier to
>> accomplish.  Roughly, you'd take your existing loop, and put a yield
>> statement in it at appropriate place(s).  Then the custom event is
>> simply a call to the .next() function of that generator.
>>
>> Now, threading isn't that tough either, depending on how much data is
>> being shared between the thread and the main program.  You say that
>> sharing a global flag isn't working, but it should.  So how about if you
>> show us some code, and somebody'll spot the trouble.  For example, is
>> the thread defined in the same module as the App?  Global only shares
>> between a single module.  Another reason globals might seem to fail is
>> if you tried to do mutual imports between two or more modules.  (A
>> imports B, which imports A).  Sometimes that fails in mysterious ways.
>>
>> Make a simple (stripped) example of what you're trying, and we'll try to
>> find the problem.  Without concrete code, we end up with ambiguities
>> like the above usage of two different meanings for "the loop."- Hide quoted text -
>>
>> - Show quoted text -
>>     
>
> Thank's Dave,
> Here my code, It's a very simple app. the Start button starts a TCP/IP
> communication and the Stop should dtop it and kill the client.
> I'll be thankful if you'll be able to spot my mistake.
> Thanks again
> Dave
>
> #Global Variable
> bStopLoop =alse
>
> #Global Function
> def execute(sockObj):
>    while(!bStopLoop):
>       str =ockObj.recv(1024)
>       tmpStr =Hello " + str
>       sockObj.send(tmpStr)
>
> #Thread handle class
> class myThread(threading.Thread):
>    def __init__(self,sockObj):
>       threading.Thread.__init__(self)
>       bStopLoop =alse
>       self.sockObj =ockObj
>
>    def run(self):
>       execute(self.SockObj)
>
> # GUI
> class GUI(model.Background)
>
>    def on_Start_mouseclick(self,event):
>    try:
>       event.target.enable =alse
>       event.target.redraw()
>       self.components.Start.enable =alse
>       self.currThread =yThread(self.sockObj)
>       self.currThread.Start()
>       wx.SafeYield(self)
>       self.components.Start.enable =rue
>    except:
>       .....
>
>    def on_Stop_mouseclick(self,event):
>       bStopLoop =rue
>
>   
In the two methods that try to change bStopLoop, you don't declare it 
global.  Add the line "global bStopLoop"  to beginning of both 

on_Start_mouseclick() and on_Stop_mouseclick(), and (my preference) to function execute()

The semantics of global versus local variables for non-nested functions/methods is roughly:   if a function or method assigns to a name, it's taken to be a local, unless it's explicitly declared as global. 




From deets at nospam.web.de  Thu May 14 08:39:07 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 14 May 2009 14:39:07 +0200
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
Message-ID: <772hjpF1f0d2dU1@mid.uni-berlin.de>

flamz3d at gmail.com wrote:

> Hello,
> I am wondering if it's possible to get the return value of a method
> *without* calling it using introspection?

Nope. All that's possible to see if there is a implicit or explicit return
through dis.disassemble - if you find "LOAD_CONST None" before any
return-statement, you know that you don't anything else.

Diez


From bearophileHUGS at lycos.com  Thu May 14 09:02:05 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 14 May 2009 06:02:05 -0700 (PDT)
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
Message-ID: <c36aa147-d153-4583-86fb-ea141efcc39f@o14g2000vbo.googlegroups.com>

flam... at gmail.com:
> I am wondering if it's possible to get the return value of a method
> *without* calling it using introspection?

Python is dynamically typed, so you can create a function like this:

>>> foo = lambda x: "x" if x else 1
>>> foo(1)
'x'
>>> foo(0)
1

The return type of foo() changes according to the input value.
In general there's not much hope to know the return type if you don't
actually run the function.

Bye,
bearophile


From zhenhai.zhang at gmail.com  Thu May 14 09:05:38 2009
From: zhenhai.zhang at gmail.com (Zhenhai Zhang)
Date: Thu, 14 May 2009 09:05:38 -0400
Subject: python copy method alters type
Message-ID: <4A0C1722.4050600@gmail.com>

Really weired; Here is my code:

    a = ["a", 1, 3, 4]
    print "a:", a
   
    c = copy(a)
    c[0] = "c"
    c[1] = 2
    print "c:", c
    print "a:",a

output as follows:

a: ['a', 1, 3, 4]
c: ['c' '2' '3' '4']
a: ['a', 1, 3, 4]

Btw, I'm using python 2.5. I'm very curious why the copied list changed 
data type.

Thanks,

Zhenhai


From deets at nospam.web.de  Thu May 14 09:07:24 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 14 May 2009 15:07:24 +0200
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<772hjpF1f0d2dU1@mid.uni-berlin.de>
Message-ID: <772j8qF1fcq5dU1@mid.uni-berlin.de>

Diez B. Roggisch wrote:

> flamz3d at gmail.com wrote:
> 
>> Hello,
>> I am wondering if it's possible to get the return value of a method
>> *without* calling it using introspection?
> 
> Nope. All that's possible to see if there is a implicit or explicit return
> through dis.disassemble - if you find "LOAD_CONST None" before any
> return-statement, you know that you don't anything else.

Gosh, this is barely intelligible...

What I wanted to say is that you can check if a function only returns
constant values, which most of the time will be implicit "return None"
statements, as in this:

def foo():
    a = 10

dis.disassemble(foo.func_code)
...
  2           0 LOAD_CONST               0 (None)
              3 RETURN_VALUE
Diez


From deets at nospam.web.de  Thu May 14 09:10:12 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 14 May 2009 15:10:12 +0200
Subject: python copy method alters type
References: <mailman.137.1242306343.8015.python-list@python.org>
Message-ID: <772je3F1fcq5dU2@mid.uni-berlin.de>

Zhenhai Zhang wrote:

> Really weired; Here is my code:
> 
>     a = ["a", 1, 3, 4]
>     print "a:", a
>    
>     c = copy(a)
>     c[0] = "c"
>     c[1] = 2
>     print "c:", c
>     print "a:",a
> 
> output as follows:
> 
> a: ['a', 1, 3, 4]
> c: ['c' '2' '3' '4']
> a: ['a', 1, 3, 4]
> 
> Btw, I'm using python 2.5. I'm very curious why the copied list changed
> data type.

It doesn't. This must be some effect of you toying around and forgetting
some steps.

>>> import copy
>>> print "a:", a
a: ['a', 1, 3, 4]
>>> c = copy.copy(a)
>>> c[0] = "c"
>>> c[1] = 2
>>> print "c:", c
c: ['c', 2, 3, 4]


Diez


From wynand.winterbach at gmail.com  Thu May 14 09:12:13 2009
From: wynand.winterbach at gmail.com (Wynand Winterbach)
Date: Thu, 14 May 2009 15:12:13 +0200
Subject: python copy method alters type
In-Reply-To: <4A0C1722.4050600@gmail.com>
References: <4A0C1722.4050600@gmail.com>
Message-ID: <1242306733.27293.1.camel@wynand-desktop>

My only guess is that the code below is not using the copy function from
the copy module, but that some other function is aliasing the copy
function.

I've tried this code with both Python 2.5 and 2.6 and get the correct
behaviour.

Best
Wynand

Op donderdag 14-05-2009 om 09:05 uur [tijdzone -0400], schreef Zhenhai
Zhang:
> Really weired; Here is my code:
> 
>     a = ["a", 1, 3, 4]
>     print "a:", a
>    
>     c = copy(a)
>     c[0] = "c"
>     c[1] = 2
>     print "c:", c
>     print "a:",a
> 
> output as follows:
> 
> a: ['a', 1, 3, 4]
> c: ['c' '2' '3' '4']
> a: ['a', 1, 3, 4]
> 
> Btw, I'm using python 2.5. I'm very curious why the copied list changed 
> data type.
> 
> Thanks,
> 
> Zhenhai



From bruno.42.desthuilliers at websiteburo.invalid  Thu May 14 09:12:30 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 14 May 2009 15:12:30 +0200
Subject: python copy method alters type
In-Reply-To: <mailman.137.1242306343.8015.python-list@python.org>
References: <mailman.137.1242306343.8015.python-list@python.org>
Message-ID: <4a0c18b7$0$5463$426a74cc@news.free.fr>

Zhenhai Zhang a ?crit :
> Really weired; Here is my code:
> 
>    a = ["a", 1, 3, 4]
>    print "a:", a
>      c = copy(a)
>    c[0] = "c"
>    c[1] = 2
>    print "c:", c
>    print "a:",a
> 
> output as follows:
> 
> a: ['a', 1, 3, 4]
> c: ['c' '2' '3' '4']
> a: ['a', 1, 3, 4]
>
> Btw, I'm using python 2.5. I'm very curious why the copied list changed 
> data type.

I think you're not using the stdlib's copy.copy function...

Python 2.5.2 (r252:60911, Oct  5 2008, 19:24:49)
GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from copy import copy
>>> a = ["a", 1, 3, 4]
>>> print a
['a', 1, 3, 4]
>>> c = copy(a)
>>> c
['a', 1, 3, 4]
>>> c[0] = "c"
>>> c[1] = 2
>>> c
['c', 2, 3, 4]
>>> a
['a', 1, 3, 4]
>>> 



From bruno.42.desthuilliers at websiteburo.invalid  Thu May 14 09:18:13 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 14 May 2009 15:18:13 +0200
Subject: introspection question: get return type
In-Reply-To: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
Message-ID: <4a0c1a0e$0$31748$426a74cc@news.free.fr>

flamz3d at gmail.com a ?crit :
> Hello,
> I am wondering if it's possible to get the return value of a method
> *without* calling it

Getting the return *value* without calling the function ? heck, that 
would be really helpful - we'd save quiet a lot on function call 
overhead and function execution time !-)

> using introspection?
> 
> something like this, suppose I want to know the type of the return
> value for the method "getsomething". Is it possible to get it without
> actually calling 'getsomething'?

Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
sense given Python's dynamic typing.





From ndbecker2 at gmail.com  Thu May 14 09:20:12 2009
From: ndbecker2 at gmail.com (Neal Becker)
Date: Thu, 14 May 2009 09:20:12 -0400
Subject: itertools question
Message-ID: <guh5qc$lsc$1@ger.gmane.org>

Is there any canned iterator adaptor that will 

transform:
in = [1,2,3....]

into:
out = [(1,2,3,4), (5,6,7,8),...]

That is, each time next() is called, a tuple of the next N items is 
returned.




From python.list at tim.thechases.com  Thu May 14 09:20:46 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 14 May 2009 08:20:46 -0500
Subject: python copy method alters type
In-Reply-To: <4A0C1722.4050600@gmail.com>
References: <4A0C1722.4050600@gmail.com>
Message-ID: <4A0C1AAE.6020908@tim.thechases.com>

Zhenhai Zhang wrote:
> Really weired; Here is my code:
> 
>     a = ["a", 1, 3, 4]
>     print "a:", a
>    
>     c = copy(a)

Where do you get this copy() function?

   tim at rubbish:~$ python2.5
   Python 2.5.4 (r254:67916, Feb 17 2009, 20:16:45)
   >>> help(copy)
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
   NameError: name 'copy' is not defined

There is no "copy" in the python default namespace.  So you must 
have gotten it somewhere.  However, if you got it from the stdlib:

   >>> from copy import copy

   >>> a = ["a", 1,2,3]
   >>> b = copy(a)
   >>> b[0] = "b"
   >>> b[1] = 42
   >>> print b
   ['b', 42, 2, 3]

it would work as evidenced here.  Thus your code shows this is 
some custom copy() function which you didn't include in your 
message.  Therein lies your problem.

For shallow-copying lists, you'll usually find it written as

   b = a[:]

The "copy" module is more useful for complex data-structures and 
deep-copies.

-tkc





From bearophileHUGS at lycos.com  Thu May 14 09:29:13 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 14 May 2009 06:29:13 -0700 (PDT)
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.29.1242119171.8015.python-list@python.org> 
	<043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>
Message-ID: <83b176cc-dce5-4fb8-a4bb-b9151f59ee9c@z7g2000vbh.googlegroups.com>

rump... at web.de:
> Eventually the "rope" data structure (that the compiler uses heavily)
> will become a proper part of the library:

Ropes are a complex data structure, that it has some downsides too.
Python tries to keep its implementation too simple, this avoids lot of
troubles (and is one of the not much visible design ideas that have
determined the success of Python).

--------

I've seen that in Nimrod the following names are the same one:
justaname JustAName just_a_name just__aname Justaname

So like Pascal (and unlike Python/C) it doesn't tell apart names just
on the base of their case (this is positive for newbie programmers,
they usually use the convention of natural written language where
'Hello' and 'hello' are the same word, they need some time to learn
the case-sensitivity).

Nimrod also seems to ignore underscores inside names, seeing them as
blanks. Some languages ignore underscores inside number literals, but
I have never seen a language ignoring them into names too.

In a class if you have a method like:
change_table_color
Isn't much good to also have a method named:
changeTableColor
Good programming practice tells you to avoid names that can be
confused (as 'chop' and 'chomp' in the string functions of D Phobos
lib). To avoid that most languages adopt a convention, so for example
in Python the change_table_color is the only used name, Java uses
changeTableColor, etc. Such conventions solve most of such problems.

So I don't know how much I like this design detail of Nimrod.

In Python you often see code like:
node = Node()

Sometimes in a case-sensitive language I'd like to have a compilation
warning switch that tells me that in a namespace there are two or more
names that differ only on character case or underscore count. This may
help avoid some bugs. A language may even enforce this as a syntax
error, so you have to write things like:
n = Node()
Or:
anode = Node()

Bye,
bearophile


From bearophileHUGS at lycos.com  Thu May 14 09:33:34 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 14 May 2009 06:33:34 -0700 (PDT)
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<c36aa147-d153-4583-86fb-ea141efcc39f@o14g2000vbo.googlegroups.com>
Message-ID: <5d98b702-2c14-4597-92a2-9947b62c91fa@v17g2000vbb.googlegroups.com>

On the other hand, generally good programming practice suggests you to
write functions that have a constant return type. And in most programs
most functions are like this. This is why ShedSkin can indeed infer
the return type of functions in "good behaved" programs. To do this
ShedSkin uses a quite refined (and slow if written in Python) type
inference algorithm.

Bye,
bearophile


From glauco.uri at prometeia.it  Thu May 14 09:35:32 2009
From: glauco.uri at prometeia.it (Glauco)
Date: Thu, 14 May 2009 15:35:32 +0200
Subject: itertools question
In-Reply-To: <mailman.139.1242307225.8015.python-list@python.org>
References: <mailman.139.1242307225.8015.python-list@python.org>
Message-ID: <4A0C1E24.1050004@prometeia.it>

Neal Becker ha scritto:
> Is there any canned iterator adaptor that will 
> 
> transform:
> in = [1,2,3....]
> 
> into:
> out = [(1,2,3,4), (5,6,7,8),...]
> 
> That is, each time next() is called, a tuple of the next N items is 
> returned.
> 
> 

http://stackoverflow.com/questions/312443/how-do-you-split-a-list-into-evenly-sized-chunks-in-python



Gla



From cgoldberg at gmail.com  Thu May 14 10:27:15 2009
From: cgoldberg at gmail.com (cgoldberg)
Date: Thu, 14 May 2009 07:27:15 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com> 
	<3ec026dc-f0f0-4554-844a-bf596d639d1d@e24g2000vbe.googlegroups.com>
Message-ID: <f0ba4b83-4a26-4486-b06e-1578730fd55f@p4g2000vba.googlegroups.com>

> The problem is, that CentOS is running on the server and there is only
> 2.4 available. On wich version did you ran these tests?

I tested with Windows XP and Python 2.5.4.  I don't have a 2.4 setup I
can easily test with.

you can try httplib rather than urllib2.  httplib is slightly lower
level and is actually used inside urllib2 for transport.

-Corey


From cgoldberg at gmail.com  Thu May 14 10:28:50 2009
From: cgoldberg at gmail.com (cgoldberg)
Date: Thu, 14 May 2009 07:28:50 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com> 
	<gugpup$1r7$1@south.jnrs.ja.net>
Message-ID: <30f3869b-3210-4887-8fad-9fdf45db3124@r36g2000vbr.googlegroups.com>

> It might be, if the local server doesn't scale well enough to handle
> 100 concurrent requests.

true.. I didn't think of that.  I was assuming the client machine
wasn't resource constrained.  That would definitely lead to inaccurate
timings if that was the case.






From google at mrabarnett.plus.com  Thu May 14 10:29:04 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 15:29:04 +0100
Subject: PythonCard - My app stuck when button clicked
In-Reply-To: <a01f1519-707d-4056-b34a-b1858c1d60e4@n4g2000vba.googlegroups.com>
References: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>	<mailman.96.1242236574.8015.python-list@python.org>
	<a01f1519-707d-4056-b34a-b1858c1d60e4@n4g2000vba.googlegroups.com>
Message-ID: <4A0C2AB0.1000503@mrabarnett.plus.com>

daved170 wrote:
> On May 13, 7:42 pm, Dave Angel <da... at ieee.org> wrote:
>> daved170 wrote:
>>> Hi there,
>>> I'm newbie in pythonCard.
>>> I have an application with 2 buttons : START , STOP
>>> Start execute a while(1) loop that execute my calculations.
>>> Stop suppose to raise a flag that will end that loop.
>>> Whenever I pish the START button my GUI is stuck. the calculation
>>> executes but I can't push the STOP button.
>>> I added thread that START start a thread that execute my calculations.
>>> I also added a Global variable that will hold the indication if the
>>> loop should continue.
>>> The problem now is that the thread ignore that variable and loop
>>> forever.
>>> Is there a simple way to make sure that the GUI won't stuck (without
>>> threads)?
>>> And if there isn't such way I would appriciet it very much if anyone
>>> could post an example of how to make my thread read that variable
>>> Thanks
>>> Dave
>> I don't know PythonCard, but most GUI's are similar enough that the
>> concepts will work, even though the details differ.  I'll assume that
>> PythonCard has a traditional event loop, from which all events are
>> dispatched.
>>
>> If your loop is fairly small, then you should keep it to one thread.  
>> Debugging it will usually be much easier.  The trick is to break the
>> task into pieces (each piece might be once around what is now a loop),
>> and invoke one piece each time the event loop empties.  I can't tell you
>> how to do that without seeing your loop, but it's not usually very hard.
>>
>> Now, there is some way of POSTing an event to the event loop.  That puts
>> the event *after* all the events that are already there, but returns
>> control immediately.  So create a custom event, and POST it from the
>> START button's button-pressed event.  That will fire off one "loop" of
>> the special task, in other words, make one function call to your new
>> function.  Then at the end of the function, POST it again, unless the
>> STOP button has been pressed in the meantime.
>>
>> An optimization for this is to use coroutines, which are usually done
>> with a generator.  It's much trickier to describe, but much easier to
>> accomplish.  Roughly, you'd take your existing loop, and put a yield
>> statement in it at appropriate place(s).  Then the custom event is
>> simply a call to the .next() function of that generator.
>>
>> Now, threading isn't that tough either, depending on how much data is
>> being shared between the thread and the main program.  You say that
>> sharing a global flag isn't working, but it should.  So how about if you
>> show us some code, and somebody'll spot the trouble.  For example, is
>> the thread defined in the same module as the App?  Global only shares
>> between a single module.  Another reason globals might seem to fail is
>> if you tried to do mutual imports between two or more modules.  (A
>> imports B, which imports A).  Sometimes that fails in mysterious ways.
>>
>> Make a simple (stripped) example of what you're trying, and we'll try to
>> find the problem.  Without concrete code, we end up with ambiguities
>> like the above usage of two different meanings for "the loop."- Hide quoted text -
>>
>> - Show quoted text -
> 
> Thank's Dave,
> Here my code, It's a very simple app. the Start button starts a TCP/IP
> communication and the Stop should dtop it and kill the client.
> I'll be thankful if you'll be able to spot my mistake.
> Thanks again
> Dave
> 
> #Global Variable
> bStopLoop = False
> 
> #Global Function
> def execute(sockObj):
>    while(!bStopLoop):

That should be:

    while not bStopLoop:

>       str = sockObj.recv(1024)
>       tmpStr = "Hello " + str
>       sockObj.send(tmpStr)
> 
> #Thread handle class
> class myThread(threading.Thread):
>    def __init__(self,sockObj):
>       threading.Thread.__init__(self)
>       bStopLoop = False

'bStopLoop' is local to __init__. Add:

       global bStopLoop

>       self.sockObj = sockObj
> 
>    def run(self):
>       execute(self.SockObj)
> 
> # GUI
> class GUI(model.Background)
> 
>    def on_Start_mouseclick(self,event):
>    try:
>       event.target.enable = False
>       event.target.redraw()
>       self.components.Start.enable = False
>       self.currThread = myThread(self.sockObj)
>       self.currThread.Start()
>       wx.SafeYield(self)
>       self.components.Start.enable = True
>    except:
>       .....
> 
>    def on_Stop_mouseclick(self,event):
>       bStopLoop = True

'bStopLoop' is local to on_Stop_mouseclick. Add:

       global bStopLoop



From nick at craig-wood.com  Thu May 14 10:30:02 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Thu, 14 May 2009 09:30:02 -0500
Subject: itertools question
References: <mailman.139.1242307225.8015.python-list@python.org>
Message-ID: <slrnh0o97s.kc3.nick@irishsea.home.craig-wood.com>

Neal Becker <ndbecker2 at gmail.com> wrote:
>  Is there any canned iterator adaptor that will 
> 
>  transform:
>  in = [1,2,3....]
> 
>  into:
>  out = [(1,2,3,4), (5,6,7,8),...]
> 
>  That is, each time next() is called, a tuple of the next N items is 
>  returned.

This is my best effort... not using itertools as my brain doesn't seem
to work that way!

class Grouper(object):
    def __init__(self, n, i):
        self.n = n
        self.i = iter(i)
    def __iter__(self):
        while True:
            out = tuple(self.i.next() for _ in xrange(self.n))
            if not out:
                break
            yield out

g = Grouper(5, xrange(20))
print list(g)

g = Grouper(4, xrange(19))
print list(g)

Which produces

[(0, 1, 2, 3, 4), (5, 6, 7, 8, 9), (10, 11, 12, 13, 14), (15, 16, 17, 18, 19)]
[(0, 1, 2, 3), (4, 5, 6, 7), (8, 9, 10, 11), (12, 13, 14, 15), (16, 17, 18)]


-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From google at mrabarnett.plus.com  Thu May 14 10:36:43 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 15:36:43 +0100
Subject: Nimrod programming language
In-Reply-To: <83b176cc-dce5-4fb8-a4bb-b9151f59ee9c@z7g2000vbh.googlegroups.com>
References: <159308160@web.de>	<mailman.29.1242119171.8015.python-list@python.org>
	<043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>
	<83b176cc-dce5-4fb8-a4bb-b9151f59ee9c@z7g2000vbh.googlegroups.com>
Message-ID: <4A0C2C7B.5010708@mrabarnett.plus.com>

bearophileHUGS at lycos.com wrote:
> rump... at web.de:
>> Eventually the "rope" data structure (that the compiler uses heavily)
>> will become a proper part of the library:
> 
> Ropes are a complex data structure, that it has some downsides too.
> Python tries to keep its implementation too simple, this avoids lot of
> troubles (and is one of the not much visible design ideas that have
> determined the success of Python).
> 
> --------
> 
> I've seen that in Nimrod the following names are the same one:
> justaname JustAName just_a_name just__aname Justaname
> 
> So like Pascal (and unlike Python/C) it doesn't tell apart names just
> on the base of their case (this is positive for newbie programmers,
> they usually use the convention of natural written language where
> 'Hello' and 'hello' are the same word, they need some time to learn
> the case-sensitivity).
> 
> Nimrod also seems to ignore underscores inside names, seeing them as
> blanks. Some languages ignore underscores inside number literals, but
> I have never seen a language ignoring them into names too.
> 
> In a class if you have a method like:
> change_table_color
> Isn't much good to also have a method named:
> changeTableColor
> Good programming practice tells you to avoid names that can be
> confused (as 'chop' and 'chomp' in the string functions of D Phobos
> lib). To avoid that most languages adopt a convention, so for example
> in Python the change_table_color is the only used name, Java uses
> changeTableColor, etc. Such conventions solve most of such problems.
> 
> So I don't know how much I like this design detail of Nimrod.
> 
> In Python you often see code like:
> node = Node()
> 
> Sometimes in a case-sensitive language I'd like to have a compilation
> warning switch that tells me that in a namespace there are two or more
> names that differ only on character case or underscore count. This may
> help avoid some bugs. A language may even enforce this as a syntax
> error, so you have to write things like:
> n = Node()
> Or:
> anode = Node()
> 
Does Nimrod accept non-ASCII names? If so, is "I" the same character as
"i"? In most languages using the Latin alphabet they would be, but in 
Turkish they wouldn't.


From __peter__ at web.de  Thu May 14 10:40:33 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 14 May 2009 16:40:33 +0200
Subject: itertools question
References: <mailman.139.1242307225.8015.python-list@python.org>
Message-ID: <guhagq$r5m$00$1@news.t-online.com>

Neal Becker wrote:

> Is there any canned iterator adaptor that will
> 
> transform:
> in = [1,2,3....]
> 
> into:
> out = [(1,2,3,4), (5,6,7,8),...]
> 
> That is, each time next() is called, a tuple of the next N items is
> returned.

Depending on what you want to do with items that don't make a complete N-
tuple:

>>> from itertools import *
>>> items = range(10)

>>> list(izip(*(iter(items),)*3))
[(0, 1, 2), (3, 4, 5), (6, 7, 8)]

>>> list(izip_longest(*(iter(items),)*3))
[(0, 1, 2), (3, 4, 5), (6, 7, 8), (9, None, None)]

>>> list(takewhile(bool, imap(tuple, starmap(islice, repeat((iter(items), 
3))))))
[(0, 1, 2), (3, 4, 5), (6, 7, 8), (9,)]

Peter



From gdamjan at gmail.com  Thu May 14 10:51:57 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Thu, 14 May 2009 16:51:57 +0200
Subject: how to consume .NET webservice
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net>
	<76rnq5F1dp6gpU1@mid.uni-berlin.de>
	<guaf4j$1fsn$1@adenine.netfront.net>
	<76slqnF1ehacbU1@mid.uni-berlin.de>
	<bb084afa-4a8a-4bf6-8786-35c6531d4ff8@j12g2000vbl.googlegroups.com>
	<e857b604-12b5-4b44-a42d-11a65ceecb50@q14g2000vbn.googlegroups.com>
Message-ID: <dpntd6-sf3.ln1@archaeopteryx.softver.org.mk>

>> OpenOfficeXML document format AKA ODF? ;)
> 
> No...Office Open XML, which is used in Microsoft Office 2007 and which
> Microsoft rammed through the ISO:
> http://en.wikipedia.org/wiki/Office_Open_XML

Even worse, Microsoft Office 2007 doesn't even implement the ISO 
standard for Open XML.

-- 
?????? ( http://softver.org.mk/damjan/ )

Our national drug is alcohol,
we tend to regard the use any other drug with special horror.
    -- William S. Burroughs




From hyugaricdeau at gmail.com  Thu May 14 10:52:29 2009
From: hyugaricdeau at gmail.com (Hyuga)
Date: Thu, 14 May 2009 07:52:29 -0700 (PDT)
Subject: matplotlib - overlaying plots.
References: <fb29579e-4229-4d99-8ed7-201099ee8595@r36g2000vbr.googlegroups.com>
Message-ID: <1223e547-6e41-4601-a3fd-f252ef2ee4e1@m24g2000vbp.googlegroups.com>

On May 14, 7:41?am, Ant <ant... at gmail.com> wrote:
> Hi All,
>
> I am trying to get matplotlib to overlay a couple of graphs, but am
> getting nowhere. I originally thought that the following may work:
>
> >>> x = [1,2,3,4,5]
> >>> y = [2,4,6,8,10]
> >>> y2 = [1,4,9,16,25]
> >>> plot(x, y)
> >>> plot(x, y2)
>
> Now this works as desired, however, the actual case I have is more
> like this:
>
> >>> x = [1,2,3,4,5]
> >>> y = [2,4,6,8,10]
> >>> y2 = [.0001, .0002, .0003, .0004, .0005]
>
> Now the graph is useless, since the results are plotted on the same
> axis. What I really want is two different sets of axes, each scaled
> appropriately, but overlayed.
>
> The data I actually have, is one set of axes plotting distance against
> elevation, and a second plotting distance against speed. The former
> has (y-coord) units in the range 0-2000 ft and the latter 0 - 0.01
> miles/second. I want them on the same graph, so points can be easily
> correlated, but overlayed so that each line has a different scale on
> the y-axis. The closest I can get is to have two subplots, one above
> the other.
>
> Thanks in advance,
>
> Ant.

Just scale up the y-axis values of your second graph 200,000 times,
and specify in label that the y-axis for the second graph is velocity
scaled up 200000x for comparison purposes.  Nothing wrong with that--
it's done all the time.

On the other hand, I just took a peek at the matplotlib example
gallery, which is very diverse, and it has an example that I think is
exactly what you're looking for: http://matplotlib.sourceforge.net/examples/api/two_scales.html


From mail at timgolden.me.uk  Thu May 14 10:57:38 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 14 May 2009 15:57:38 +0100
Subject: about Python doc reader
In-Reply-To: <4A0B403F.2090806@hughes.net>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>	<4A0AC4C7.1060000@timgolden.me.uk>
	<4A0B350A.7040006@hughes.net> <4A0B403F.2090806@hughes.net>
Message-ID: <4A0C3162.4070508@timgolden.me.uk>

norseman wrote:
> I did try these.
> 
> Doc at once:
> outputs two x'0D' and the file.  Then it appends x'0D' x'0D' x'0A' x'0D' 
> x'0A' to end of file even though source file itself has no EOL.
> ( EOL is EndOfLine  aka newline )
> 
> That's  cr cr             There are two blank lines at begining.
>         cr cr lf cr lf    There is no EOL in source
>                           Any idea what those are about?
> One crlf is probably from python's print text, but the other?
> 
> The lines=
> appends   [u'\r', u'\r', u"  to begining of output
> and   \r"]x'0D'x'0A'   to the end even though there is no EOL in source.
> 
> output is understood:    u'\r'  is Apple EOL
> the crlf is probably from print lines.

Not clear what you're doing to get there. This is the (wrapped) 
output from my interpreter, using Word 2003. As you can see, new
doc: one "\r", nothing more.

<dump>
Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 
bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more 
information.
 >>> import win32com.client
 >>> word = win32com.client.gencache.EnsureDispatch 
("Word.Application")
 >>> doc = word.Documents.Add ()
 >>> print repr (doc.Range ().Text)
u'\r'
 >>>

</dump>



From david.lyon at preisshare.net  Thu May 14 10:59:30 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Thu, 14 May 2009 10:59:30 -0400
Subject: (Windows) Finding out which process has locked a file.
In-Reply-To: <guh02f$re4$2@lust.ihug.co.nz>
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
	<guh02f$re4$2@lust.ihug.co.nz>
Message-ID: <8f2c1f99fb621acd11c5a2b63214ab3d@preisshare.net>


> In message <787d6072-3381-40bd-
> af20-8e1a40405033 at h23g2000vbc.googlegroups.com>, CinnamonDonkey wrote:
> 
>> I have a script running which occa[s]ionally fails because it is trying
>> to delete a file in use by another process. When this happens I want
>> it to log which process has the lock.

Maybe there is something on sysinternals.com that you can download....


From cbc at unc.edu  Thu May 14 11:02:46 2009
From: cbc at unc.edu (Chris Calloway)
Date: Thu, 14 May 2009 11:02:46 -0400
Subject: Toronto PyCamp 2009
Message-ID: <4A0C3296.9010303@unc.edu>

For beginners, this ultra-low-cost Python Boot Camp developed by the 
Triangle Zope and Python Users Group makes you productive so you can get 
your work done quickly. PyCamp emphasizes the features which make Python 
a simpler and more efficient language. Following along by example speeds 
your learning process in a modern high-tech classroom. Become a 
self-sufficient Python developer in just five days at PyCamp!

The University or Toronto Department of Physics brings PyCamp to 
Toronto, July 13-17, 2009.

Register today at http://trizpug.org/boot-camp/pycamp-toronto-2009/

-- 
Sincerely,

Chris Calloway
http://www.secoora.org
office: 332 Chapman Hall   phone: (919) 599-3530
mail: Campus Box #3300, UNC-CH, Chapel Hill, NC 27599





From daved170 at gmail.com  Thu May 14 11:08:51 2009
From: daved170 at gmail.com (daved170)
Date: Thu, 14 May 2009 08:08:51 -0700 (PDT)
Subject: PythonCard - My app stuck when button clicked
References: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>
	<mailman.96.1242236574.8015.python-list@python.org>
	<a01f1519-707d-4056-b34a-b1858c1d60e4@n4g2000vba.googlegroups.com>
	<mailman.136.1242304959.8015.python-list@python.org>
Message-ID: <6fb29d5f-19f2-45f0-a171-ceea2bd87f61@e24g2000vbe.googlegroups.com>

On May 14, 2:37?pm, Dave Angel <da... at ieee.org> wrote:
> daved170 wrote:
> > On May 13, 7:42 pm, Dave Angel <da... at ieee.org> wrote:
>
> >> daved170 wrote:
>
> >>> Hi there,
> >>> I'm newbie in pythonCard.
> >>> I have an application with 2 buttons : START , STOP
> >>> Start execute a while(1) loop that execute my calculations.
> >>> Stop suppose to raise a flag that will end that loop.
>
> >>> Whenever I pish the START button my GUI is stuck. the calculation
> >>> executes but I can't push the STOP button.
>
> >>> I added thread that START start a thread that execute my calculations.
> >>> I also added a Global variable that will hold the indication if the
> >>> loop should continue.
> >>> The problem now is that the thread ignore that variable and loop
> >>> forever.
>
> >>> Is there a simple way to make sure that the GUI won't stuck (without
> >>> threads)?
> >>> And if there isn't such way I would appriciet it very much if anyone
> >>> could post an example of how to make my thread read that variable
> >>> Thanks
> >>> Dave
>
> >> I don't know PythonCard, but most GUI's are similar enough that the
> >> concepts will work, even though the details differ. ?I'll assume that
> >> PythonCard has a traditional event loop, from which all events are
> >> dispatched.
>
> >> If your loop is fairly small, then you should keep it to one thread. ?
> >> Debugging it will usually be much easier. ?The trick is to break the
> >> task into pieces (each piece might be once around what is now a loop),
> >> and invoke one piece each time the event loop empties. ?I can't tell you
> >> how to do that without seeing your loop, but it's not usually very hard.
>
> >> Now, there is some way of POSTing an event to the event loop. ?That puts
> >> the event *after* all the events that are already there, but returns
> >> control immediately. ?So create a custom event, and POST it from the
> >> START button's button-pressed event. ?That will fire off one "loop" of
> >> the special task, in other words, make one function call to your new
> >> function. ?Then at the end of the function, POST it again, unless the
> >> STOP button has been pressed in the meantime.
>
> >> An optimization for this is to use coroutines, which are usually done
> >> with a generator. ?It's much trickier to describe, but much easier to
> >> accomplish. ?Roughly, you'd take your existing loop, and put a yield
> >> statement in it at appropriate place(s). ?Then the custom event is
> >> simply a call to the .next() function of that generator.
>
> >> Now, threading isn't that tough either, depending on how much data is
> >> being shared between the thread and the main program. ?You say that
> >> sharing a global flag isn't working, but it should. ?So how about if you
> >> show us some code, and somebody'll spot the trouble. ?For example, is
> >> the thread defined in the same module as the App? ?Global only shares
> >> between a single module. ?Another reason globals might seem to fail is
> >> if you tried to do mutual imports between two or more modules. ?(A
> >> imports B, which imports A). ?Sometimes that fails in mysterious ways.
>
> >> Make a simple (stripped) example of what you're trying, and we'll try to
> >> find the problem. ?Without concrete code, we end up with ambiguities
> >> like the above usage of two different meanings for "the loop."- Hide quoted text -
>
> >> - Show quoted text -
>
> > Thank's Dave,
> > Here my code, It's a very simple app. the Start button starts a TCP/IP
> > communication and the Stop should dtop it and kill the client.
> > I'll be thankful if you'll be able to spot my mistake.
> > Thanks again
> > Dave
>
> > #Global Variable
> > bStopLoop =alse
>
> > #Global Function
> > def execute(sockObj):
> > ? ?while(!bStopLoop):
> > ? ? ? str =ockObj.recv(1024)
> > ? ? ? tmpStr =Hello " + str
> > ? ? ? sockObj.send(tmpStr)
>
> > #Thread handle class
> > class myThread(threading.Thread):
> > ? ?def __init__(self,sockObj):
> > ? ? ? threading.Thread.__init__(self)
> > ? ? ? bStopLoop =alse
> > ? ? ? self.sockObj =ockObj
>
> > ? ?def run(self):
> > ? ? ? execute(self.SockObj)
>
> > # GUI
> > class GUI(model.Background)
>
> > ? ?def on_Start_mouseclick(self,event):
> > ? ?try:
> > ? ? ? event.target.enable =alse
> > ? ? ? event.target.redraw()
> > ? ? ? self.components.Start.enable =alse
> > ? ? ? self.currThread =yThread(self.sockObj)
> > ? ? ? self.currThread.Start()
> > ? ? ? wx.SafeYield(self)
> > ? ? ? self.components.Start.enable =rue
> > ? ?except:
> > ? ? ? .....
>
> > ? ?def on_Stop_mouseclick(self,event):
> > ? ? ? bStopLoop =rue
>
> In the two methods that try to change bStopLoop, you don't declare it
> global. ?Add the line "global bStopLoop" ?to beginning of both
>
> on_Start_mouseclick() and on_Stop_mouseclick(), and (my preference) to function execute()
>
> The semantics of global versus local variables for non-nested functions/methods is roughly: ? if a function or method assigns to a name, it's taken to be a local, unless it's explicitly declared as global.- Hide quoted text -
>
> - Show quoted text -

Thanks Dave. It works! It solved that problem. Now all i need is to
stop the socket in a way that whenever I push the Start button again
my app won't raise network connectio, but I think I'll handle that by
myself.
Thank's again
Dave.


From lie.1296 at gmail.com  Thu May 14 11:38:20 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Fri, 15 May 2009 01:38:20 +1000
Subject: itertools question
In-Reply-To: <guh5qc$lsc$1@ger.gmane.org>
References: <guh5qc$lsc$1@ger.gmane.org>
Message-ID: <guhdtn$jeg$1@ger.gmane.org>

Neal Becker wrote:
> Is there any canned iterator adaptor that will 
> 
> transform:
> in = [1,2,3....]
> 
> into:
> out = [(1,2,3,4), (5,6,7,8),...]
> 
> That is, each time next() is called, a tuple of the next N items is 
> returned.
> 
> 



An option, might be better since it handles infinite list correctly:

 >>> lst = [1, 4, 2, 5, 7, 3, 2, 5, 7, 3, 2, 6, 3, 2, 6, 8, 4, 2]
 >>> d = 4
 >>> for x in itertools.groupby(enumerate(lst), lambda x: x[0] // d):
...     print(list(x[1]))
...
[(0, 1), (1, 4), (2, 2), (3, 5)]
[(4, 7), (5, 3), (6, 2), (7, 5)]
[(8, 7), (9, 3), (10, 2), (11, 6)]
[(12, 3), (13, 2), (14, 6), (15, 8)]
[(16, 4), (17, 2)]
 >>> [list(x[1]) for x in itertools.groupby(enumerate(lst), lambda x: 
x[0] // d)]
[[(0, 1), (1, 4), (2, 2), (3, 5)], [(4, 7), (5, 3), (6, 2), (7, 5)], 
[(8, 7), (9, 3), (10, 2), (11, 6)], [(12, 3), (13, 2), (14, 6), (15, 
8)], [(16, 4), (17, 2)]]



From antroy at gmail.com  Thu May 14 11:42:14 2009
From: antroy at gmail.com (Ant)
Date: Thu, 14 May 2009 08:42:14 -0700 (PDT)
Subject: matplotlib - overlaying plots.
References: <fb29579e-4229-4d99-8ed7-201099ee8595@r36g2000vbr.googlegroups.com>
	<1223e547-6e41-4601-a3fd-f252ef2ee4e1@m24g2000vbp.googlegroups.com>
Message-ID: <6a162e77-68de-4303-9534-e5f0d2282934@e24g2000vbe.googlegroups.com>

On May 14, 3:52?pm, Hyuga <hyugaricd... at gmail.com> wrote:
...
> On the other hand, I just took a peek at the matplotlib example
> gallery, which is very diverse, and it has an example that I think is
> exactly what you're looking for:http://matplotlib.sourceforge.net/examples/api/two_scales.html

Superb - spot on. Thanks.


From wells at submute.net  Thu May 14 11:45:56 2009
From: wells at submute.net (Wells)
Date: Thu, 14 May 2009 08:45:56 -0700 (PDT)
Subject: Assigning a list to a key of a dict
Message-ID: <40cdcd9b-3964-4fb7-89ad-32bb684ee54b@o20g2000vbh.googlegroups.com>

Why can't I do this?

teams = { "SEA": "Seattle Mariners" }
for team, name in teams.items():
        teams[team]["roster"] = ["player1", "player2"]

I get an error:

Traceback (most recent call last):
  File "./gamelogs.py", line 53, in <module>
    teams[team]["roster"] = ["player1", "player2"]
TypeError: 'str' object does not support item assignment

You can see that I am trying to make a key called "roster" for each
team item in the dictionary, which is a list of players.


From nad at acm.org  Thu May 14 11:53:15 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 14 May 2009 08:53:15 -0700
Subject: itertools question
References: <guh5qc$lsc$1@ger.gmane.org>
Message-ID: <nad-A18E7F.08531514052009@news.gmane.org>

In article <guh5qc$lsc$1 at ger.gmane.org>,
 Neal Becker <ndbecker2 at gmail.com> wrote:
> Is there any canned iterator adaptor that will 
> 
> transform:
> in = [1,2,3....]
> 
> into:
> out = [(1,2,3,4), (5,6,7,8),...]
> 
> That is, each time next() is called, a tuple of the next N items is 
> returned.

This topic was discussed here just a few days ago:

<http://comments.gmane.org/gmane.comp.python.general/622763>

-- 
 Ned Deily,
 nad at acm.org



From socyl at 987jk.com.invalid  Thu May 14 11:53:23 2009
From: socyl at 987jk.com.invalid (kj)
Date: Thu, 14 May 2009 15:53:23 +0000 (UTC)
Subject: How to get all named args in a dict?
References: <guffbh$7do$1@reader1.panix.com>
	<mailman.113.1242254593.8015.python-list@python.org>
Message-ID: <guhepj$frm$1@reader1.panix.com>

In <mailman.113.1242254593.8015.python-list at python.org> Terry Reedy <tjreedy at udel.edu> writes:

>kj wrote:
>> 
>> Suppose I have the following:
>> 
>> def foo(x=None, y=None, z=None):
>>     d = {"x": x, "y": y, "z": z}
>>     return bar(d)
>> 
>> I.e. foo takes a whole bunch of named arguments and ends up calling
>> a function bar that takes a single dictionary as argument, and this
>> dictionary has the same keys as in foo's signature, so to speak.
>> 
>> Is there some builtin variable that would be the same as the variable
>> d, and would thus obviate the need to explicitly bind d?

>Use the built-in function locals()
> >>> def f(a,b):
>	x=locals()
>	print(x)

> >>> f(1,2)
>{'a': 1, 'b': 2}

That's *exactly* what I was looking for.  Thanks!

kynn


-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From agaskins_ng at kelleramerica.com  Thu May 14 11:57:27 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Thu, 14 May 2009 11:57:27 -0400
Subject: When *don't* I use 'self' in classes?
References: <rXHOl.41113$5N7.8212@newsfe09.iad>
Message-ID: <JbXOl.74825$HZ1.66158@newsfe15.iad>

Thanks a lot everyone! This really cleared it up for me! :)

"Adam Gaskins" <agaskins_ng at kelleramerica.com> wrote in message 
news:rXHOl.41113$5N7.8212 at newsfe09.iad...
>I am a bit confused as too when, if ever, it is not appropriate to prepend 
>'self' to objects in a class. All of the examples of how to use 'self' that 
>I find seem to be short and very simple (as examples tent to be). I 
>appologize if I am asking an ignorant question here, but I want to get off 
>on the right foot. Here's an example of what I mean:
>
> import serial
> class foo:
>    def __init(self, comport):
>        self.comport = comport
>        self.baudrate = 9600 #default
>        self.ser = serial
>        try:
>            self.ser.Serial()
>            self.ser.baudrate = self.baudrate
>            self.ser.open()
>        except:
>            print 'Serial port could not be opened'
>
> === OR ===
> import serial
> class foo:
>    def __init(self, comport):
>        self.comport = comport
>        self.baudrate = 9600 #default
>        try:
>            ser = serial.Serial()
>            ser.baudrate = self.baudrate
>            ser.open()
>        except:
>            print 'Serial port could not be opened'
>
> There may be a typo in here, this is just a random example similar to 
> something I'm working with, but which one of these are more 'proper'? If I 
> am importing a library do I still prepend it's object with self when I use 
> it in my class? I suppose my question is just basically... when do you NOT 
> prepent an object in a class with 'self'?
>
> I'm not even sure I'm using the term 'object' correctly here. Feel free to 
> set me straight, but I hope my example makes it clear what I am asking.
>
> Thanks a lot, this ng has already been super helpful as I take my 
> crash-course in to python! :P
> 




From ccurvey at gmail.com  Thu May 14 11:57:33 2009
From: ccurvey at gmail.com (Chris Curvey)
Date: Thu, 14 May 2009 08:57:33 -0700 (PDT)
Subject: capture stdout and stderror from within a Windows Service?
Message-ID: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>

I'm trying to get this invocation right, and it is escaping me.  How
can I capture the stdout and stderr if I launch a subprocess using
subprocess.check_call()?  The twist here is that the call is running
from within a Windows service.

I've tried:

check_call("mycmd.exe", stdout=subprocess.PIPE)  [raises an exception
"An integer is required"]

check_call("mycmd.exe", stdout=file("c:\\temp\\foobar.txt", "w"))
[raises an exception "An integer is required"]


From deets at nospam.web.de  Thu May 14 11:57:40 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 14 May 2009 17:57:40 +0200
Subject: Assigning a list to a key of a dict
References: <40cdcd9b-3964-4fb7-89ad-32bb684ee54b@o20g2000vbh.googlegroups.com>
Message-ID: <772t82F1edjpdU1@mid.uni-berlin.de>

Wells wrote:

> Why can't I do this?
> 
> teams = { "SEA": "Seattle Mariners" }
> for team, name in teams.items():
>         teams[team]["roster"] = ["player1", "player2"]
> 
> I get an error:
> 
> Traceback (most recent call last):
>   File "./gamelogs.py", line 53, in <module>
>     teams[team]["roster"] = ["player1", "player2"]
> TypeError: 'str' object does not support item assignment
> 
> You can see that I am trying to make a key called "roster" for each
> team item in the dictionary, which is a list of players.

This is not a list as key, it's a nested dictionary. There are several
approaches to this:

 - make your keys tuples, like this:

>>> teams[(team, "roster") = [...]

 - use setedfault:

>>> teams.setdefault(team, {})["roster"] = ['player1']

 - defaultdict

>>> from collections import *
>>> defaultdict
<type 'collections.defaultdict'>
>>> teams = defaultdict(dict)
>>> teams["team"]["roster"] = ["player1"]
>>> teams
defaultdict(<type 'dict'>, {'team': {'roster': ['player1']}})
>>>                                                   

Diez


From marco at sferacarta.com  Thu May 14 11:57:47 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Thu, 14 May 2009 17:57:47 +0200
Subject: introspection question: get return type
In-Reply-To: <4a0c1a0e$0$31748$426a74cc@news.free.fr>
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<4a0c1a0e$0$31748$426a74cc@news.free.fr>
Message-ID: <%bXOl.15204$Ux.561@tornado.fastwebnet.it>

Bruno Desthuilliers wrote:

> Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
> sense given Python's dynamic typing.

I thought that the OP was writing a tool to document not-very-dynamic code.

Unless he's really trying to write in Nohtyp, the language where value 
types are more important than values ;)



From clp2 at rebertia.com  Thu May 14 11:58:04 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 14 May 2009 08:58:04 -0700
Subject: Assigning a list to a key of a dict
In-Reply-To: <40cdcd9b-3964-4fb7-89ad-32bb684ee54b@o20g2000vbh.googlegroups.com>
References: <40cdcd9b-3964-4fb7-89ad-32bb684ee54b@o20g2000vbh.googlegroups.com>
Message-ID: <50697b2c0905140858u75ef1833xe00646dd13fcc9cf@mail.gmail.com>

On Thu, May 14, 2009 at 8:45 AM, Wells <wells at submute.net> wrote:
> Why can't I do this?
>
> teams = { "SEA": "Seattle Mariners" }
> for team, name in teams.items():
> ? ? ? ?teams[team]["roster"] = ["player1", "player2"]
> I get an error:
>
> Traceback (most recent call last):
> ?File "./gamelogs.py", line 53, in <module>
> ? ?teams[team]["roster"] = ["player1", "player2"]
> TypeError: 'str' object does not support item assignment

teams - a dict of str to str
teams[team] - a string (specifically, "Seattle Mariners" in this case)
teams[team]["roster"] - um, you can't subscript a string by another
string; you can subscript it only by integer indices

> You can see that I am trying to make a key called "roster" for each
> team item in the dictionary, which is a list of players.

I'd say you need to restructure your data structure by introducing
another level of dictionaries:

teams = { "SEA": {"full_name":"Seattle Mariners"} }
for team, name in teams.items():
    teams[team]["roster"] = ["player1", "player2"]
print teams
#output: {'SEA': {'full_name': 'Seattle Mariners', 'roster':
['player1', 'player2']}}

Of course, it would probably be nicer if you did this using objects
(e.g. define a Team class and have `teams` be a dict of str to Team.

Cheers,
Chris
-- 
http://blog.rebertia.com


From gherron at islandtraining.com  Thu May 14 11:59:10 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 14 May 2009 08:59:10 -0700
Subject: Assigning a list to a key of a dict
In-Reply-To: <40cdcd9b-3964-4fb7-89ad-32bb684ee54b@o20g2000vbh.googlegroups.com>
References: <40cdcd9b-3964-4fb7-89ad-32bb684ee54b@o20g2000vbh.googlegroups.com>
Message-ID: <4A0C3FCE.5030400@islandtraining.com>

Wells wrote:
> Why can't I do this?
>
> teams = { "SEA": "Seattle Mariners" }
> for team, name in teams.items():
>         teams[team]["roster"] = ["player1", "player2"]
>   

Because,
  team will be "SEA",
so 
  teams[team] will be  "Seattle Mariners"
and
  "Seattle Mariners"["roster"] makes no sense.



Gary Herron


> I get an error:
>
> Traceback (most recent call last):
>   File "./gamelogs.py", line 53, in <module>
>     teams[team]["roster"] = ["player1", "player2"]
> TypeError: 'str' object does not support item assignment
>
> You can see that I am trying to make a key called "roster" for each
> team item in the dictionary, which is a list of players.
>   



From clp2 at rebertia.com  Thu May 14 12:00:44 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 14 May 2009 09:00:44 -0700
Subject: itertools question
In-Reply-To: <nad-A18E7F.08531514052009@news.gmane.org>
References: <guh5qc$lsc$1@ger.gmane.org>
	<nad-A18E7F.08531514052009@news.gmane.org>
Message-ID: <50697b2c0905140900g695e5c20if6d44a9e03922726@mail.gmail.com>

On Thu, May 14, 2009 at 8:53 AM, Ned Deily <nad at acm.org> wrote:
> In article <guh5qc$lsc$1 at ger.gmane.org>,
> ?Neal Becker <ndbecker2 at gmail.com> wrote:
>> Is there any canned iterator adaptor that will
>>
>> transform:
>> in = [1,2,3....]
>>
>> into:
>> out = [(1,2,3,4), (5,6,7,8),...]
>>
>> That is, each time next() is called, a tuple of the next N items is
>> returned.
>
> This topic was discussed here just a few days ago:
>
> <http://comments.gmane.org/gmane.comp.python.general/622763>

They really should just add grouper() to itertools rather than leaving
it as a recipe. People keep asking for it so often...

Cheers,
Chris
-- 
http://blog.rebertia.com


From clp2 at rebertia.com  Thu May 14 12:08:08 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 14 May 2009 09:08:08 -0700
Subject: capture stdout and stderror from within a Windows Service?
In-Reply-To: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
References: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
Message-ID: <50697b2c0905140908x564e8555oe5b889012cc420fb@mail.gmail.com>

On Thu, May 14, 2009 at 8:57 AM, Chris Curvey <ccurvey at gmail.com> wrote:
> I'm trying to get this invocation right, and it is escaping me. ?How
> can I capture the stdout and stderr if I launch a subprocess using
> subprocess.check_call()? ?The twist here is that the call is running
> from within a Windows service.
>
> I've tried:
>
> check_call("mycmd.exe", stdout=subprocess.PIPE) ?[raises an exception
> "An integer is required"]
>
> check_call("mycmd.exe", stdout=file("c:\\temp\\foobar.txt", "w"))
> [raises an exception "An integer is required"]

Providing the full exception Tracebacks would be highly recommended.

Cheers,
Chris
-- 
http://blog.rebertia.com


From norseman at hughes.net  Thu May 14 12:14:34 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 09:14:34 -0700
Subject: matplotlib - overlaying plots.
In-Reply-To: <fb29579e-4229-4d99-8ed7-201099ee8595@r36g2000vbr.googlegroups.com>
References: <fb29579e-4229-4d99-8ed7-201099ee8595@r36g2000vbr.googlegroups.com>
Message-ID: <4A0C436A.7040408@hughes.net>

Ant wrote:
> Hi All,
> 
> I am trying to get matplotlib to overlay a couple of graphs, but am
> getting nowhere. I originally thought that the following may work:
> 
>>>> x = [1,2,3,4,5]
>>>> y = [2,4,6,8,10]
>>>> y2 = [1,4,9,16,25]
> 
>>>> plot(x, y)
>>>> plot(x, y2)
> 
> Now this works as desired, however, the actual case I have is more
> like this:
> 
>>>> x = [1,2,3,4,5]
>>>> y = [2,4,6,8,10]
>>>> y2 = [.0001, .0002, .0003, .0004, .0005]
> 
> Now the graph is useless, since the results are plotted on the same
> axis. What I really want is two different sets of axes, each scaled
> appropriately, but overlayed.
> 
> The data I actually have, is one set of axes plotting distance against
> elevation, and a second plotting distance against speed. The former
> has (y-coord) units in the range 0-2000 ft and the latter 0 - 0.01
> miles/second. I want them on the same graph, so points can be easily
> correlated, but overlayed so that each line has a different scale on
> the y-axis. The closest I can get is to have two subplots, one above
> the other.
> 
> Thanks in advance,
> 
> Ant.
> 

======================
Use scalers to 'sync' the axis (x or y or both on the page)
The 'scales' along the axis need to match or you get your problem.

You know - like trying to do 1:1 but one is meters and the other feet.
That case needs two different graphs (or CAD drawings) each with its own 
legend.  The scales are not the same.  ie... 100meters is not 100feet
By scalling to same units/distance on graph you get overlay ability.

my first thought on your 0-2000ft and miles/sec is to convert miles to 
feet and multiply time by enough to be integer values and see if you get 
a better visual

one graph means one set of units per axis
              or
plot each and scale one to the other
   (in CAD it's a case of meters/3.280833333_ to reduce to feet units
   .3048 * meters if using International scaler
   meters/3.280833333333(infinitely repeating 3s) is US Standard.
   The difference cost us a mars rover.
   You don't seem to be metric vs US but you do have miss matched units.
   miles vs feet, time vs (feet)elevation
   or whatever the units distance/elevation may be.
   )
target_size / 2nd_graph unit => scaler for that axis (mostly)
   since the units are not completely the same type you may need
   to experiment.
     same units would be  time time          hours days seconds
                          linear linear      meter feet mile
                          angular angular    mils degrees rads
     and so forth.

HTH


Steve


From invalid at invalid  Thu May 14 12:16:51 2009
From: invalid at invalid (Grant Edwards)
Date: Thu, 14 May 2009 11:16:51 -0500
Subject: capture stdout and stderror from within a Windows Service?
References: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
Message-ID: <fbKdndszhZhu3pHXnZ2dnUVZ_uydnZ2d@posted.visi>

On 2009-05-14, Chris Curvey <ccurvey at gmail.com> wrote:
> I'm trying to get this invocation right, and it is escaping me.  How
> can I capture the stdout and stderr if I launch a subprocess using
> subprocess.check_call()?  The twist here is that the call is running
> from within a Windows service.
>
> I've tried:
>
> check_call("mycmd.exe", stdout=subprocess.PIPE)  [raises an exception
> "An integer is required"]
>
> check_call("mycmd.exe", stdout=file("c:\\temp\\foobar.txt", "w"))
> [raises an exception "An integer is required"]

An educated guess...

By default, subprocess will use the existing stdin, stdout, and
stderr filedescriptors for the child process. Since services
presumably don't have valid file descriptors for stdin, stdout,
and stderr, you probably have to tell subprocess to use pipes
for all three.  Otherwise, it will default to using the invalid
or nonexistant file descriptors of the parent.

[If you reply, I proably won't see it.  All posts from google
groups are plonked by my newsreader configuration.  It was
somewhat of a fluke that I came across your posting.]

-- 
Grant Edwards                   grante             Yow! On the road, ZIPPY
                                  at               is a pinhead without a
                               visi.com            purpose, but never without
                                                   a POINT.


From norseman at hughes.net  Thu May 14 12:23:15 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 09:23:15 -0700
Subject: about Python doc reader
In-Reply-To: <4A0C3162.4070508@timgolden.me.uk>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>	<4A0AC4C7.1060000@timgolden.me.uk>	<4A0B350A.7040006@hughes.net>
	<4A0B403F.2090806@hughes.net> <4A0C3162.4070508@timgolden.me.uk>
Message-ID: <4A0C4573.9090801@hughes.net>

Tim Golden wrote:
> norseman wrote:
>> I did try these.
>>
>> Doc at once:
>> outputs two x'0D' and the file.  Then it appends x'0D' x'0D' x'0A' 
>> x'0D' x'0A' to end of file even though source file itself has no EOL.
>> ( EOL is EndOfLine  aka newline )
>>
>> That's  cr cr             There are two blank lines at begining.
>>         cr cr lf cr lf    There is no EOL in source
>>                           Any idea what those are about?
>> One crlf is probably from python's print text, but the other?
>>
>> The lines=
>> appends   [u'\r', u'\r', u"  to begining of output
>> and   \r"]x'0D'x'0A'   to the end even though there is no EOL in source.
>>
>> output is understood:    u'\r'  is Apple EOL
>> the crlf is probably from print lines.
> 
> Not clear what you're doing to get there. This is the (wrapped) output 
> from my interpreter, using Word 2003. As you can see, new
> doc: one "\r", nothing more.
> 
> <dump>
> Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit 
> (Intel)] on win32
> Type "help", "copyright", "credits" or "license" for more information.
>  >>> import win32com.client
>  >>> word = win32com.client.gencache.EnsureDispatch ("Word.Application")
>  >>> doc = word.Documents.Add ()
>  >>> print repr (doc.Range ().Text)
> u'\r'
>  >>>
> 
> </dump>
> 
==============
The original "do it this way" snippets were:
<code>
import win32com.client

doc = win32com.client.GetObject ("c:/temp/temp.doc")
text = doc.Range ().Text

</code>

Note that this will give you a unicode object with \r line-delimiters.
You could read para by para if that were more useful:

<code>
import win32com.client

doc = win32com.client.GetObject ("c:/temp/temp.doc")
lines = [p.Range () for p in doc.Paragraphs]

</code>


and I added:

print text    after "text =" line above

print lines   after "lines =" line above

then ran file using   python test.py >letmesee
followed by viewing letmesee in hex



Steve





From R.Brodie at rl.ac.uk  Thu May 14 12:33:48 2009
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Thu, 14 May 2009 17:33:48 +0100
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com>
	<gugpup$1r7$1@south.jnrs.ja.net>
	<747b0d4f-f9fd-4fa6-bb6d-0a4365f328ba@b1g2000vbc.googlegroups.com>
Message-ID: <guhh5c$8dc$1@south.jnrs.ja.net>


"Tomas Svarovsky" <svarovsky.tomas at gmail.com> wrote in message 
news:747b0d4f-f9fd-4fa6-bb6d-0a4365f328ba at b1g2000vbc.googlegroups.com...

> This is a good point, but then it would manifest regardless of the
> language used AFAIK. And this is not the case, ruby and php
> implementations are working quite fine.

What I meant was: not reading the data and leaving the connection
open is going to force the server to handle all 100 requests concurrently.
I'm guessing that's not what your other implementations do.
What happens to the timing if you call response.read(), response.close() ? 




From norseman at hughes.net  Thu May 14 12:49:33 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 09:49:33 -0700
Subject: Odd list behavior
In-Reply-To: <op.utv27casa8ncjz@gnudebst>
References: <4A0B40E0.2060600@gmail.com> <4A0B44DA.2040107@hughes.net>
	<op.utv27casa8ncjz@gnudebst>
Message-ID: <4A0C4B9D.20301@hughes.net>

Rhodri James wrote:
> On Wed, 13 May 2009 23:08:26 +0100, norseman <norseman at hughes.net> wrote:
> 
>> Evan Kroske wrote:
>>> I'm working on a simple file processing utility, and I encountered a 
>>> weird error. If I try to get the first element of a list I'm 
>>> splitting from a string, I get an error:
>>>  key = string.split()[0]
>>> Error!
>>>  However, I can slice the list like normal, but that gives me a 
>>> one-element-long list:
>>>  key = string.split()[:1]
>>> Success!
>>>  Finally, the operation works perfectly if I initialize the list 
>>> beforehand:
>>>  list = string.split()
>>> key = list[0]
>>> Success!
>>>  Why does this happen?
> 
>>
>> ==========================
>> Take a look at the  split() command.
>>
>> I think you will find you need one var on the left side for each piece 
>> on the right.
> 
> Given that he's immediately indexing the split results, that's irrelevant.
> There's no point in even guessing with out the traceback.
> 

"...the first element of a list..."
"key = string.split()[0]"
if the list is a list of tuples the error message is correct.
same for a list of key:value pairs
he will need one var on left for each piece of [0]
  k,v=  list.split(key:value)    ??!!


Steve


From norseman at hughes.net  Thu May 14 13:02:21 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 10:02:21 -0700
Subject: capture stdout and stderror from within a Windows Service?
In-Reply-To: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
References: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
Message-ID: <4A0C4E9D.30507@hughes.net>

Chris Curvey wrote:
> I'm trying to get this invocation right, and it is escaping me.  How
> can I capture the stdout and stderr if I launch a subprocess using
> subprocess.check_call()?  The twist here is that the call is running
> from within a Windows service.
> 
> I've tried:
> 
> check_call("mycmd.exe", stdout=subprocess.PIPE)  [raises an exception
> "An integer is required"]

mycmd.exe isn't open (running). the mycmd.exe is supposed to be a fn.
How did you start it?

> 
> check_call("mycmd.exe", stdout=file("c:\\temp\\foobar.txt", "w"))
> [raises an exception "An integer is required"]
==============
I think you need to run the .exe from your .py using the subprocess 
module's commands and hook in at that time to stdin, stdout, ....
get the fn and use check_call() to see if .exe has something to say.

Check subprocess's help/man and so forth.

I know that if you start a program via os.Popen2's popen3 things work as 
expected.  How you would redirect I/O in an arbitrary already running 
program in Windows is a good question.


Steve


From manu3d at gmail.com  Thu May 14 13:04:58 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Thu, 14 May 2009 10:04:58 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
	<fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com>
Message-ID: <d3631430-f8b9-42ce-af42-df4f3c5ef186@o14g2000vbo.googlegroups.com>

Thank you Paul for your reply!

I'm looking into pxdom right now and it looks very good and useful!

Thank you again!

Manu



From lie.1296 at gmail.com  Thu May 14 13:06:38 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 14 May 2009 17:06:38 GMT
Subject: itertools question
In-Reply-To: <mailman.149.1242316847.8015.python-list@python.org>
References: <guh5qc$lsc$1@ger.gmane.org>	<nad-A18E7F.08531514052009@news.gmane.org>
	<mailman.149.1242316847.8015.python-list@python.org>
Message-ID: <ycYOl.11027$y61.8941@news-server.bigpond.net.au>

Chris Rebert wrote:
> They really should just add grouper() to itertools rather than leaving
> it as a recipe. People keep asking for it so often...

I've just added it to the issue tracker: http://bugs.python.org/issue6021


From bdesth.quelquechose at free.quelquepart.fr  Thu May 14 13:19:31 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Thu, 14 May 2009 19:19:31 +0200
Subject: introspection question: get return type
In-Reply-To: <%bXOl.15204$Ux.561@tornado.fastwebnet.it>
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<4a0c1a0e$0$31748$426a74cc@news.free.fr>
	<%bXOl.15204$Ux.561@tornado.fastwebnet.it>
Message-ID: <4a0c6e42$0$12031$426a74cc@news.free.fr>

Marco Mariani a ?crit :
> Bruno Desthuilliers wrote:
> 
>> Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
>> sense given Python's dynamic typing.
> 
> I thought that the OP was writing a tool to document not-very-dynamic code.

>
> Unless he's really trying to write in Nohtyp,

You meant "Notype" ?-)

> the language where value 
> types are more important than values ;)

Hence it's name !-)


From vavasis at cpu111.math.uwaterloo.ca  Thu May 14 13:25:00 2009
From: vavasis at cpu111.math.uwaterloo.ca (Stephen Vavasis)
Date: Thu, 14 May 2009 17:25:00 +0000 (UTC)
Subject: C API: how to replace python number object in place?
Message-ID: <guhk5c$gb2$1@rumours.uwaterloo.ca>

If x is a C variable of type PyObject*, and I happen to know already that 
the object is of a numeric type, say int, is there a way to change the 
value of x in place to a different number?  In the C/API documentation I 
found routines to increment or decrement it in place, but I didn't find a 
routine to simply replace its value by a different value.  (I suppose I 
could change it to the new value via an increment or decrement, but this 
is ugly as well as being susceptible to overflow problems and roundoff 
errors in the case of floats.)

Thanks,
Steve Vavasis


From bdesth.quelquechose at free.quelquepart.fr  Thu May 14 13:31:07 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Thu, 14 May 2009 19:31:07 +0200
Subject: When *don't* I use 'self' in classes?
In-Reply-To: <mailman.117.1242257951.8015.python-list@python.org>
References: <rXHOl.41113$5N7.8212@newsfe09.iad>
	<mailman.117.1242257951.8015.python-list@python.org>
Message-ID: <4a0c70f9$0$18747$426a74cc@news.free.fr>

Tim Chase a ?crit :
(snip)


>      try:
>        self.ser = Serial()
>        self.ser.baudrate = DEFAULT_BAUD
>        self.ser.open()
>      except SomeSpecificException:
>        print "Fail!"
> 

Please make it:


       try:
         self.ser = Serial()
         self.ser.baudrate = DEFAULT_BAUD
         self.ser.open()
       except SomeSpecificException, e:
         print "Fail! reason : %s" % e


From jenn.duerr at gmail.com  Thu May 14 13:41:17 2009
From: jenn.duerr at gmail.com (noydb)
Date: Thu, 14 May 2009 10:41:17 -0700 (PDT)
Subject: putting date strings in order
References: mailman.52.1242143921.8015.python-list@python.org 
	<a276bc1e-a800-4dbc-ac77-55923ccf36c8@f1g2000prb.googlegroups.com>
Message-ID: <dc7e9d9c-5957-45ab-9228-70dafbe46e7a@n4g2000vba.googlegroups.com>

On May 12, 12:26?pm, John Machin <sjmac... at lexicon.net> wrote:
> On May 13, 1:58?am, Jaime Fernandez del Rio <jaime.f... at gmail.com>
> wrote:
>
>
>
>
>
> > On Tue, May 12, 2009 at 5:02 PM, MRAB <goo... at mrabarnett.plus.com> wrote:
> > > John Machin wrote:
>
> > >> MRAB <google <at> mrabarnett.plus.com> writes:
>
> > >>> Sort the list, passing a function as the 'key' argument. The function
> > >>> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
> > >>> you want to have a different start month then add
>
> > >> and if you don't like what that produces, try subtract :-)
>
> > > Oops!
>
> > >>> the appropriate
> > >>> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
> > >>> to make it wrap around (there are only 12 months in a year), returning
> > >>> the result.
>
> > > Actually, subtract the start month, add 12, and then modulo 12.
>
> > Both on my Linux and my Windows pythons, modulos of negative numbers
> > are properly taken, returning always the correct positive number
> > between 0 and 11. I seem to recall, from my distant past, that Perl
> > took pride on this being a language feature. Anyone knows if that is
> > not the case with python, and so not adding 12 before taking the
> > modulo could result in wrong results in some implementations?
>
> If that happens, it's a bug.http://docs.python.org/reference/expressions.html#binary-arithmetic-o...
>
> If you look at function i_divmod() in the 2.x branch's Objects/
> intobject.c, you'll be reassured to see that it doesn't just take
> whatever C serves up :-)- Hide quoted text -
>
> - Show quoted text -

Thanks to those who provided suggestions.  I ended up using code
similar to what Jaime provided above first -- truly eloquent and
simple, especially compared to my original thoughts of several messy
loops.  I knew it could be done way better.  Thanks very much Jaime!!
That was a good learning experience for me.

fairly finished portion of code:

ordered_raster_list = []

pRasters = gp.ListRasters("precip_*", "All") # an enumeration object,
arcgis method
pRast = pRasters.next()
while pRast:
##    month = pRast[-3:]
##    print month
    print pRast
    ordered_raster_list.append(pRast)
    pRast = pRasters.next()


print ordered_raster_list #unordered at this point

# create a dictionary dictating the order of the the precip_<months>
rasters
monthsD = {"precip_jan" : 1, "precip_feb" : 2, "precip_mar" : 3,
"precip_apr" : 4, "precip_may" : 5, "precip_jun" : 6,
           "precip_jul" : 7, "precip_aug" : 8, "precip_sep" : 9,
"precip_oct" : 10, "precip_nov" : 11, "precip_dec" : 12}

# sort the list based on the dictionary
ordered_raster_list.sort(None, lambda x : monthsD[x])

print ordered_raster_list #ordered

start = 2 #user to define, starting month

ordered_raster_list = ordered_raster_list[start - 1:] +
ordered_raster_list[:start - 1]

print ordered_raster_list #ordered but starting in the middle, feb in
this case, ending with jan


From __peter__ at web.de  Thu May 14 14:13:28 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 14 May 2009 20:13:28 +0200
Subject: putting date strings in order
References: <dc7e9d9c-5957-45ab-9228-70dafbe46e7a@n4g2000vba.googlegroups.com>
Message-ID: <guhn01$j0r$03$1@news.t-online.com>

noydb wrote:

> On May 12, 12:26 pm, John Machin <sjmac... at lexicon.net> wrote:
>> On May 13, 1:58 am, Jaime Fernandez del Rio <jaime.f... at gmail.com>
>> wrote:
>>
>>
>>
>>
>>
>> > On Tue, May 12, 2009 at 5:02 PM, MRAB <goo... at mrabarnett.plus.com>
>> > wrote:
>> > > John Machin wrote:
>>
>> > >> MRAB <google <at> mrabarnett.plus.com> writes:
>>
>> > >>> Sort the list, passing a function as the 'key' argument. The
>> > >>> function should return an integer for the month, eg 0 for 'jan', 1
>> > >>> for 'feb'. If you want to have a different start month then add
>>
>> > >> and if you don't like what that produces, try subtract :-)
>>
>> > > Oops!
>>
>> > >>> the appropriate
>> > >>> integer for that month (eg 0 for 'jan', 1 for 'feb') and then
>> > >>> modulo 12 to make it wrap around (there are only 12 months in a
>> > >>> year), returning the result.
>>
>> > > Actually, subtract the start month, add 12, and then modulo 12.
>>
>> > Both on my Linux and my Windows pythons, modulos of negative numbers
>> > are properly taken, returning always the correct positive number
>> > between 0 and 11. I seem to recall, from my distant past, that Perl
>> > took pride on this being a language feature. Anyone knows if that is
>> > not the case with python, and so not adding 12 before taking the
>> > modulo could result in wrong results in some implementations?
>>
>> If that happens, it's a
>> bug.http://docs.python.org/reference/expressions.html#binary-arithmetic-
o...
>>
>> If you look at function i_divmod() in the 2.x branch's Objects/
>> intobject.c, you'll be reassured to see that it doesn't just take
>> whatever C serves up :-)- Hide quoted text -
>>
>> - Show quoted text -
> 
> Thanks to those who provided suggestions.  I ended up using code
> similar to what Jaime provided above first -- truly eloquent and
> simple, especially compared to my original thoughts of several messy
> loops.  I knew it could be done way better.  Thanks very much Jaime!!
> That was a good learning experience for me.
> 
> fairly finished portion of code:
> 
> ordered_raster_list = []
> 
> pRasters = gp.ListRasters("precip_*", "All") # an enumeration object,
> arcgis method
> pRast = pRasters.next()
> while pRast:
> ##    month = pRast[-3:]
> ##    print month
>     print pRast
>     ordered_raster_list.append(pRast)
>     pRast = pRasters.next()
> 
> 
> print ordered_raster_list #unordered at this point
> 
> # create a dictionary dictating the order of the the precip_<months>
> rasters
> monthsD = {"precip_jan" : 1, "precip_feb" : 2, "precip_mar" : 3,
> "precip_apr" : 4, "precip_may" : 5, "precip_jun" : 6,
>            "precip_jul" : 7, "precip_aug" : 8, "precip_sep" : 9,
> "precip_oct" : 10, "precip_nov" : 11, "precip_dec" : 12}
> 
> # sort the list based on the dictionary
> ordered_raster_list.sort(None, lambda x : monthsD[x])
> 
> print ordered_raster_list #ordered
> 
> start = 2 #user to define, starting month
> 
> ordered_raster_list = ordered_raster_list[start - 1:] +
> ordered_raster_list[:start - 1]
> 
> print ordered_raster_list #ordered but starting in the middle, feb in
> this case, ending with jan

Hm, if ordered_raster_list is guaranteed to contain one string item for 
every month the above can be simplified to

months = [
    'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr', 
    'precip_may', 'precip_jun', 'precip_jul', 'precip_aug', 
    'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec']

start = 2
ordered_raster_list = months[start-1:] + months[:start-1]

print ordered_raster_list

What am I missing?

Peter



From benjamin at python.org  Thu May 14 14:47:40 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Thu, 14 May 2009 18:47:40 +0000 (UTC)
Subject: C API: how to replace python number object in place?
References: <guhk5c$gb2$1@rumours.uwaterloo.ca>
Message-ID: <loom.20090514T184620-738@post.gmane.org>

Stephen Vavasis <vavasis <at> cpu111.math.uwaterloo.ca> writes:

> 
> If x is a C variable of type PyObject*, and I happen to know already that 
> the object is of a numeric type, say int, is there a way to change the 
> value of x in place to a different number?  In the C/API documentation I 
> found routines to increment or decrement it in place, but I didn't find a 
> routine to simply replace its value by a different value.  (I suppose I 
> could change it to the new value via an increment or decrement, but this 
> is ugly as well as being susceptible to overflow problems and roundoff 
> errors in the case of floats.)

Even in the C-API, Python ints and longs are immutable. You can convert it to a
C int and work with it, otherwise you have to use the APIs which create new
objects: PyNumber_Add etc...





From davea at ieee.org  Thu May 14 15:07:27 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 14 May 2009 15:07:27 -0400
Subject: How to get all named args in a dict?
In-Reply-To: <guhepj$frm$1@reader1.panix.com>
References: <guffbh$7do$1@reader1.panix.com>	<mailman.113.1242254593.8015.python-list@python.org>
	<guhepj$frm$1@reader1.panix.com>
Message-ID: <4A0C6BEF.1010709@ieee.org>



kj wrote:
> In <mailman.113.1242254593.8015.python-list at python.org> Terry Reedy <tjreedy at udel.edu> writes:
>
>   
>> kj wrote:
>>     
>>> Suppose I have the following:
>>>
>>> def foo(x=None, y=None, z=None):
>>>     d = {"x": x, "y": y, "z": z}
>>>     return bar(d)
>>>
>>> I.e. foo takes a whole bunch of named arguments and ends up calling
>>> a function bar that takes a single dictionary as argument, and this
>>> dictionary has the same keys as in foo's signature, so to speak.
>>>
>>> Is there some builtin variable that would be the same as the variable
>>> d, and would thus obviate the need to explicitly bind d?
>>>       
>
>   
>> Use the built-in function locals()
>>     
>>>>> def f(a,b):
>>>>>           
>> 	x=locals()
>> 	print(x)
>>     
>
>   
>>>>> f(1,2)
>>>>>           
>> {'a': 1, 'b': 2}
>>     
>
> That's *exactly* what I was looking for.  Thanks!
>
> kynn
>
>
>   
You already had a better answer from Chris Rebert:

def foo(**kwargs):
    return bar(kwargs)

kwargs at this point is exactly a dictionary of the named arguments to foo.

Because if you try to do anything in this function, you'll probably be 
adding more local variables. And then they'd be passed to bar as well.




From stef.mientki at gmail.com  Thu May 14 15:20:07 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Thu, 14 May 2009 21:20:07 +0200
Subject: OS independent file associate ?
Message-ID: <4A0C6EE7.3070709@gmail.com>

hello,

I would like to make my programs available under the "standard" OS's, 
like Windows, Linux  (,Mac)
One of the problems I encounter, is launching of files through their 
file associates (probably a windows only terminology ;-)
Now I can detect the OS, but only the main OS and not e.g. Ubuntu / 
Gnome or whatever I've to detect.
Through trial and error I found a working mechanism under Ubuntu, but as 
I have to specify "gnome", I doubt this will work under other Linux systems.

any good solutions available ?

thanks,
Stef Mientki

    import subprocess
    CHM = '../numpy.chm'
 
    # works under Ubuntu
    subprocess.Popen( "gnome-open " + CHM , shell = True )

    # doesn't work under Ubuntu
    # (the list should be converted to a number of arguments,
    #but that doesn't seem to work under Ubuntu.
    subprocess.Popen( [ "gnome-open" , CHM] ,shell = True )

    # works under Windows
    subprocess.Popen( CHM , shell = True )

    # works better under windows
    win32help.HtmlHelp ( Win32_Viewer,
                         str(CHM),
                         win32help.HH_DISPLAY_INDEX,
                         str ( keyword ) )

   


From socyl at 987jk.com.invalid  Thu May 14 15:31:55 2009
From: socyl at 987jk.com.invalid (kj)
Date: Thu, 14 May 2009 19:31:55 +0000 (UTC)
Subject: How to get the formal args of a function object?
Message-ID: <guhrjb$79i$1@reader1.panix.com>



Suppose that f is an object whose type is 'function'.

Is there a way to find out f's list of formal arguments?

The reason for this is that I'm trying to write a decorator and
I'd like the wrapper to be able to check the number of arguments
passed.  Specifically, I'd like the wrapper to look as shown below:

def _wrap(f):
    def wrapper(self, *params):
        n_expected = len(f.FORMAL_ARGS)
        n_received = len(params)
        if n_received is not n_expected:
            raise RuntimeError("Wrong number of arguments passed "
                               "to %s" % f.__name__)
        return self.send_jsonrpc_request(f.__name__, params)
    return wrapper

...but I'm missing something like the hypothetical attribute
FORMAL_ARGS above.

TIA!

Kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From aahz at pythoncraft.com  Thu May 14 15:55:43 2009
From: aahz at pythoncraft.com (Aahz)
Date: 14 May 2009 12:55:43 -0700
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<4a0c1a0e$0$31748$426a74cc@news.free.fr>
	<%bXOl.15204$Ux.561@tornado.fastwebnet.it>
	<4a0c6e42$0$12031$426a74cc@news.free.fr>
Message-ID: <guhsvv$cu$1@panix3.panix.com>

In article <4a0c6e42$0$12031$426a74cc at news.free.fr>,
Bruno Desthuilliers  <bdesth.quelquechose at free.quelquepart.fr> wrote:
>Marco Mariani a ?crit :
>> Bruno Desthuilliers wrote:
>>> 
>>> Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
>>> sense given Python's dynamic typing.
>>
>> Unless he's really trying to write in Nohtyp,
>
>You meant "Notype" ?-)

Marco's spelling is correct.  Try "Nohtyp".reverse()
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From Scott.Daniels at Acm.Org  Thu May 14 16:13:09 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 14 May 2009 13:13:09 -0700
Subject: putting date strings in order
In-Reply-To: <guhn01$j0r$03$1@news.t-online.com>
References: <dc7e9d9c-5957-45ab-9228-70dafbe46e7a@n4g2000vba.googlegroups.com>
	<guhn01$j0r$03$1@news.t-online.com>
Message-ID: <UImdnbqCOMOL55HXnZ2dnUVZ_gCdnZ2d@pdx.net>

Peter Otten wrote:
> Hm, if ordered_raster_list is guaranteed to contain one string item for 
> every month the above can be simplified to
> 
> months = [
>     'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr', 
>     'precip_may', 'precip_jun', 'precip_jul', 'precip_aug', 
>     'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec']
> 
> start = 2
> ordered_raster_list = months[start-1:] + months[:start-1]

Or even:
 >
     multi_months = [
         'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr',
         'precip_may', 'precip_jun', 'precip_jul', 'precip_aug',
         'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec'] * 2
     start = 2
     ordered_raster_list = multi_months[start - 1: start + 11]

--Scott David Daniels
Scott.Daniels at Acm.Org


From socyl at 987jk.com.invalid  Thu May 14 16:15:26 2009
From: socyl at 987jk.com.invalid (kj)
Date: Thu, 14 May 2009 20:15:26 +0000 (UTC)
Subject: How to get all named args in a dict?
References: <guffbh$7do$1@reader1.panix.com>	<mailman.113.1242254593.8015.python-list@python.org>
	<guhepj$frm$1@reader1.panix.com>
	<mailman.158.1242328059.8015.python-list@python.org>
Message-ID: <guhu4u$i38$1@reader1.panix.com>

In <mailman.158.1242328059.8015.python-list at python.org> Dave Angel <davea at ieee.org> writes:



>kj wrote:
>> In <mailman.113.1242254593.8015.python-list at python.org> Terry Reedy <tjreedy at udel.edu> writes:
>>
>>   
>>> kj wrote:
>>>     
>>>> Suppose I have the following:
>>>>
>>>> def foo(x=None, y=None, z=None):
>>>>     d = {"x": x, "y": y, "z": z}
>>>>     return bar(d)
>>>>
>>>> I.e. foo takes a whole bunch of named arguments and ends up calling
>>>> a function bar that takes a single dictionary as argument, and this
>>>> dictionary has the same keys as in foo's signature, so to speak.
>>>>
>>>> Is there some builtin variable that would be the same as the variable
>>>> d, and would thus obviate the need to explicitly bind d?
>>>>       
>>
>>   
>>> Use the built-in function locals()
>>>     
>>>>>> def f(a,b):
>>>>>>           
>>> 	x=locals()
>>> 	print(x)
>>>     
>>
>>   
>>>>>> f(1,2)
>>>>>>           
>>> {'a': 1, 'b': 2}
>>>     
>>
>> That's *exactly* what I was looking for.  Thanks!
>>
>> kynn
>>
>>
>>   
>You already had a better answer from Chris Rebert:

>def foo(**kwargs):
>    return bar(kwargs)

>kwargs at this point is exactly a dictionary of the named arguments to foo.

I disagree.  If I defined foo as you show above, then there is no
error checking on the named parameters passed to foo; anything
goes.

>Because if you try to do anything in this function, you'll probably be 
>adding more local variables. And then they'd be passed to bar as well.

That problem is easily solved: just make "x = locals()" the first
statement in the definition of foo.

kynn
-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From Scott.Daniels at Acm.Org  Thu May 14 16:20:50 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 14 May 2009 13:20:50 -0700
Subject: C API: how to replace python number object in place?
In-Reply-To: <guhk5c$gb2$1@rumours.uwaterloo.ca>
References: <guhk5c$gb2$1@rumours.uwaterloo.ca>
Message-ID: <JrudnVSRisF_5pHXnZ2dnUVZ_rOdnZ2d@pdx.net>

Stephen Vavasis wrote:
> If x is a C variable of type PyObject*, and I happen to know already that 
> the object is of a numeric type, say int, is there a way to change the 
> value of x in place to a different number?  In the C/API documentation I 
> found routines to increment or decrement it in place, but I didn't find a 
> routine to simply replace its value by a different value.  (I suppose I 
> could change it to the new value via an increment or decrement, but this 
> is ugly as well as being susceptible to overflow problems and roundoff 
> errors in the case of floats.)
> 
> Thanks,
> Steve Vavasis
If you do figurte out how to do what you want, you will put us in the
old FORTRAN trap:  People can write code that changes the value of a
constant.
The code:
     month = 12 # make it december
     inches_per_foot = 12
     make_previous(month)
     print ('Month is now: %s, inches_per_foot = %s' % (
                month, inches_per_foot))
might print:
     Month is now: 11, inches_per_foot = 11

--Scott David Daniels
Scott.Daniels at Acm.Org


From tack at urandom.ca  Thu May 14 16:24:56 2009
From: tack at urandom.ca (Jason Tackaberry)
Date: Thu, 14 May 2009 16:24:56 -0400
Subject: How to get all named args in a dict?
In-Reply-To: <guhu4u$i38$1@reader1.panix.com>
References: <guffbh$7do$1@reader1.panix.com>
	<mailman.113.1242254593.8015.python-list@python.org>
	<guhepj$frm$1@reader1.panix.com>
	<mailman.158.1242328059.8015.python-list@python.org>
	<guhu4u$i38$1@reader1.panix.com>
Message-ID: <1242332696.3568.63.camel@arrakis>

On Thu, 2009-05-14 at 20:15 +0000, kj wrote:
> That problem is easily solved: just make "x = locals()" the first
> statement in the definition of foo.

That doesn't solve the problem.  You'd need locals().copy()

Cheers,
Jason.



From socyl at 987jk.com.invalid  Thu May 14 16:26:55 2009
From: socyl at 987jk.com.invalid (kj)
Date: Thu, 14 May 2009 20:26:55 +0000 (UTC)
Subject: Need advice on distributing small module
Message-ID: <guhuqf$h3u$1@reader1.panix.com>




I've written a tiny module that I'd like to make available online
from my website.  This module is not "production-grade" code; it
is meant only as an illustration, but still I'd like to make its
download and installation as painless as possible.

I could simply bundle everything into a .tgz file, but I'd like
the distribution to conform to the expectations of Python users,
as far as the installation sequence is concerned.  I'm fairly new
to Python, and would appreciate your advice on this last point.

The module has only one non-standard dependency, described by the
following code:

if sys.version_info[:2] >= (2, 6):
    import json
else:
    import simplejson as json

If possible, I'd like to make distribution procedure such that if
necessary it also installs json or simplejson (as the case may be).

The actual package would contain the module file and a README file.

Is there a standard tool I can use to create this distribution?

TIA!

kynn
-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From clp2 at rebertia.com  Thu May 14 16:27:41 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 14 May 2009 13:27:41 -0700
Subject: How to get the formal args of a function object?
In-Reply-To: <guhrjb$79i$1@reader1.panix.com>
References: <guhrjb$79i$1@reader1.panix.com>
Message-ID: <50697b2c0905141327j6bd85c79l85bb9ca96181cb60@mail.gmail.com>

On Thu, May 14, 2009 at 12:31 PM, kj <socyl at 987jk.com.invalid> wrote:
>
>
> Suppose that f is an object whose type is 'function'.
>
> Is there a way to find out f's list of formal arguments?
>
> The reason for this is that I'm trying to write a decorator and
> I'd like the wrapper to be able to check the number of arguments
> passed. ?Specifically, I'd like the wrapper to look as shown below:
>
> def _wrap(f):
> ? ?def wrapper(self, *params):
> ? ? ? ?n_expected = len(f.FORMAL_ARGS)
> ? ? ? ?n_received = len(params)
> ? ? ? ?if n_received is not n_expected:
> ? ? ? ? ? ?raise RuntimeError("Wrong number of arguments passed "
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? "to %s" % f.__name__)
> ? ? ? ?return self.send_jsonrpc_request(f.__name__, params)
> ? ?return wrapper
>
> ...but I'm missing something like the hypothetical attribute
> FORMAL_ARGS above.

Take a look at inspect.getargspec(func):
http://docs.python.org/library/inspect.html#inspect.getargspec

Cheers,
Chris
-- 
http://blog.rebertia.com

> --
> NOTE: In my address everything before the first period is backwards;
> and the last period, and everything after it, should be discarded.

P.S. Have you considered making your address obfuscation just slightly
less of a pain in the ass? It's particularly annoying compared to
others'.


From jeff at jmcneil.net  Thu May 14 16:33:55 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Thu, 14 May 2009 13:33:55 -0700 (PDT)
Subject: How to get the formal args of a function object?
References: <guhrjb$79i$1@reader1.panix.com>
Message-ID: <17f96405-c164-4bbb-920d-adbdb54c66a6@o20g2000vbh.googlegroups.com>

You can pull it out of f.func_code.co_varnames, but I don't believe
that's a very good approach. I tend to veer away from code objects
myself.

If you know how many arguments are passed into the wrapped function
when it's defined, you can write a function that returns your
decorator. As an example...

def validate_params(c):
    def the_decorator(f):
        def wrapper(*args):
            if len(args) != c:
                raise Exception("Bad things, Man.")
            return f(*args)
        return wrapper
    return the_decorator

@validate_params(2)
def add(a,b):
    return a+b

add(1,2)
add(1,2,3)

$ ./test.py
Traceback (most recent call last):
  File "test.py", line 16, in <module>
    add(1,2,3)
  File "test.py", line 5, in wrapper
    raise Exception("Bad things, Man.")
Exception: Bad things, Man.

Jeff



On May 14, 3:31?pm, kj <so... at 987jk.com.invalid> wrote:
> Suppose that f is an object whose type is 'function'.
>
> Is there a way to find out f's list of formal arguments?
>
> The reason for this is that I'm trying to write a decorator and
> I'd like the wrapper to be able to check the number of arguments
> passed. ?Specifically, I'd like the wrapper to look as shown below:
>
> def _wrap(f):
> ? ? def wrapper(self, *params):
> ? ? ? ? n_expected = len(f.FORMAL_ARGS)
> ? ? ? ? n_received = len(params)
> ? ? ? ? if n_received is not n_expected:
> ? ? ? ? ? ? raise RuntimeError("Wrong number of arguments passed "
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?"to %s" % f.__name__)
> ? ? ? ? return self.send_jsonrpc_request(f.__name__, params)
> ? ? return wrapper
>
> ...but I'm missing something like the hypothetical attribute
> FORMAL_ARGS above.
>
> TIA!
>
> Kynn
>
> --
> NOTE: In my address everything before the first period is backwards;
> and the last period, and everything after it, should be discarded.



From norseman at hughes.net  Thu May 14 16:40:06 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 13:40:06 -0700
Subject: OS independent file associate ?
In-Reply-To: <4A0C6EE7.3070709@gmail.com>
References: <4A0C6EE7.3070709@gmail.com>
Message-ID: <4A0C81A6.3070107@hughes.net>

Stef Mientki wrote:
> hello,
> 
> I would like to make my programs available under the "standard" OS's, 
> like Windows, Linux  (,Mac)
> One of the problems I encounter, is launching of files through their 
> file associates (probably a windows only terminology ;-)
> Now I can detect the OS, but only the main OS and not e.g. Ubuntu / 
> Gnome or whatever I've to detect.
> Through trial and error I found a working mechanism under Ubuntu, but as 
> I have to specify "gnome", I doubt this will work under other Linux 
> systems.
> 
> any good solutions available ?
> 
> thanks,
> Stef Mientki
> 
>    import subprocess
>    CHM = '../numpy.chm'
> 
>    # works under Ubuntu
>    subprocess.Popen( "gnome-open " + CHM , shell = True )
> 
>    # doesn't work under Ubuntu
>    # (the list should be converted to a number of arguments,
>    #but that doesn't seem to work under Ubuntu.
>    subprocess.Popen( [ "gnome-open" , CHM] ,shell = True )
> 
>    # works under Windows
>    subprocess.Popen( CHM , shell = True )
> 
>    # works better under windows
>    win32help.HtmlHelp ( Win32_Viewer,
>                         str(CHM),
>                         win32help.HH_DISPLAY_INDEX,
>                         str ( keyword ) )
> 
>  
================================

General algorithm  which I have used for years.
Convert to specific syntax of compiler/interpreter/whatever...


Get OS from an OS call       Python has  platform   for that
Get the version              Python has  uname      for that
Get the version              Linux has   uname -a   for that

Pick your OS you use most and put that test first
   if it fails, try 2nd
   it it fails, try 3rd
   .
   .
each try uses the files suited to OS attempted


FYI
import platform
help(platform)
   (read)

os_is= platform.system()
   test for os_is == which



platform.dist()   check the doc - not sure this one does anything useful

platform.uname()  check the doc - Test it on Ubuntu, may be useful



Steve


From Scott.Daniels at Acm.Org  Thu May 14 16:42:16 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 14 May 2009 13:42:16 -0700
Subject: How to get the formal args of a function object?
In-Reply-To: <guhrjb$79i$1@reader1.panix.com>
References: <guhrjb$79i$1@reader1.panix.com>
Message-ID: <E8ednaCLtPh1HZHXnZ2dnUVZ_jOdnZ2d@pdx.net>

kj wrote:
> Suppose that f is an object whose type is 'function'.
> 
> Is there a way to find out f's list of formal arguments?
> 
> The reason for this is that I'm trying to write a decorator and
> I'd like the wrapper to be able to check the number of arguments
> passed....but I'm missing something like the hypothetical attribute
> FORMAL_ARGS above.

I can write a wrapper now:

     def tracer(function):
         def internal(*args, **kwargs):
             print('calling %s(%s)' % (function.__name__,
                     ', '.join([repr(arg) for arg in args] +
                               ['%s=%r' % ka for ka in sorted(kwargs)])))
             result = function(*args, **kwargs)
             print('=> %r' % result)
         return internal

and call like so:
     tracer(math.sin)(3.1415 / 6)

     calling sin(0.5235833333333334)
     => 0.49998662654663256

What would your missing something be for tracer(math.sin)?

--Scott David Daniels
Scott.Daniels at Acm.Org


From gchen9 at gmail.com  Thu May 14 16:45:10 2009
From: gchen9 at gmail.com (guangshan chen)
Date: Thu, 14 May 2009 15:45:10 -0500
Subject: how to import MV module
Message-ID: <9DCDC50A-C057-4A2A-BE20-3F08A6DE5F86@gmail.com>

Hi all,

I am new. I just want to run a python program.

When I run it, python can not find MV module. The follow is the error  
information:
Traceback (most recent call last):
   File "MakeCouplerRestart.py", line 22, in <module>
     import MV,struct,Numeric,string
ImportError: No module named MV

Could any one tell me how to import MV module. Where is it?

Thanks..

Guangshan



From hniksic at xemacs.org  Thu May 14 16:59:29 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Thu, 14 May 2009 22:59:29 +0200
Subject: C API: how to replace python number object in place?
References: <guhk5c$gb2$1@rumours.uwaterloo.ca>
Message-ID: <87eiurbdu6.fsf@busola.homelinux.net>

vavasis at cpu111.math.uwaterloo.ca (Stephen Vavasis) writes:

> If x is a C variable of type PyObject*, and I happen to know already
> that the object is of a numeric type, say int, is there a way to
> change the value of x in place to a different number?  In the C/API
> documentation I found routines to increment or decrement it in
> place, but I didn't find a routine to simply replace its value by a
> different value.

The only thing you can do is change x to point to a different object,
with the new desired value.  That is how the "in place" number
modification functions work.

Which routines to increment or decrement the number are you referring
to, exactly?


From piet at cs.uu.nl  Thu May 14 17:06:54 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Thu, 14 May 2009 23:06:54 +0200
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.29.1242119171.8015.python-list@python.org>
	<043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>
	<83b176cc-dce5-4fb8-a4bb-b9151f59ee9c@z7g2000vbh.googlegroups.com>
Message-ID: <m2eiurjswh.fsf@cs.uu.nl>

>>>>> bearophileHUGS at lycos.com (b) wrote:

>b> Nimrod also seems to ignore underscores inside names, seeing them as
>b> blanks. Some languages ignore underscores inside number literals, but
>b> I have never seen a language ignoring them into names too.

You may not have seen it, but Fortran and Algol 60 belong to that
category. 
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From norseman at hughes.net  Thu May 14 17:15:05 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 14:15:05 -0700
Subject: How to get the formal args of a function object?
In-Reply-To: <guhrjb$79i$1@reader1.panix.com>
References: <guhrjb$79i$1@reader1.panix.com>
Message-ID: <4A0C89D9.3070600@hughes.net>

kj wrote:
> 
> Suppose that f is an object whose type is 'function'.
> 
> Is there a way to find out f's list of formal arguments?
> 
> The reason for this is that I'm trying to write a decorator and
> I'd like the wrapper to be able to check the number of arguments
> passed.  Specifically, I'd like the wrapper to look as shown below:
> 
> def _wrap(f):
>     def wrapper(self, *params):
>         n_expected = len(f.FORMAL_ARGS)
>         n_received = len(params)
>         if n_received is not n_expected:
>             raise RuntimeError("Wrong number of arguments passed "
>                                "to %s" % f.__name__)
>         return self.send_jsonrpc_request(f.__name__, params)
>     return wrapper
> 
> ...but I'm missing something like the hypothetical attribute
> FORMAL_ARGS above.
> 
> TIA!
> 
> Kynn
> 
========================================
I've never tried that approach.  But the attempt brings back memories.

Mind you I was using a compiler, not an interpreter.

Language was assembly

it outlines like this:

1st time called:

compile actual code                       # boo-koo bytes
if token count test OK
   compile the call to the code            # just the call (1 or 2 words)
else
   print current program address
   compile in a string denoting error                "ERROR-ERROR"
    to force a quit (crash)


2nd time and on

do not compile actual code               # Zero bytes
if token count test OK
   compile the call to the code           # just the call (1 or 2 words)
else
   print current program address
   compile in a string denoting error                "ERROR-ERROR"
    to force a quit (crash)

Helps to print the assembly 'prn' file and look for your error flag 
BEFORE trying to run program. :)

compiler token stack (storage) delta before/after packet loaded is
tested with size expected and compiler directives adjusted accordingly.

I have no idea how to do this with an interpreter.  Maybe someone who 
reads this can figure it out.  If so - I want a copy!!!! (Please.)

Even:
def funct_foo(t1,t2,t3):
   call_token_check(3)          will not tell the incoming number
                                they are on a stack or something
                                somewhere else in memory.
With an interpreter this becomes an expensive overhead. Mine was only 
costly at compile time. Not at run time. And it shortened the code and 
the development time.



Steve


From piet at cs.uu.nl  Thu May 14 17:16:05 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Thu, 14 May 2009 23:16:05 +0200
Subject: Distributed locking
References: <7addabf4-2b20-4be2-8d1b-cde6d0a04bb1@a5g2000pre.googlegroups.com>
Message-ID: <m2ab5fjsh6.fsf@cs.uu.nl>

>>>>> James <rent.lupin.road at gmail.com> (J) wrote:

>J> Hey all, I'm looking for suggestions on how to tackle distributed
>J> locking across several Python programs on several different machines.

Have you looked at the multiprocessing package? It has distributed
Locks's with timeouts which might well fit your requirements.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From python-url at phaseit.net  Thu May 14 17:21:15 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Thu, 14 May 2009 21:21:15 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (May 14)
Message-ID: <gui20b$bbq$1@lairds.us>

QOTW:  "Tail recursion *unifies* message passing and function calling.
*This* is the reason tail recursion is cool." - JRM
    http://funcall.blogspot.com/2009/05/you-knew-id-say-something-part-iii.html


    First beta of Python 3.1 released
        http://groups.google.com/group/comp.lang.python/t/29d24e950df2bcc6/

    Python-coded scripts can do what LINQ does in expressing queries as
    SQL against a list of rows and columns:
        http://groups.google.com/group/comp.lang.python/msg/8c67d72703979c55
    SQLite is quite wonderful.
    
    Chaining generators efficiently
        http://groups.google.com/group/comp.lang.python/t/f7503fd51f113976/
    
    Decorating a method is slightly harder than decorating a plain function:
        http://groups.google.com/group/comp.lang.python/t/956ce6027df6f8e4/
    
    heapq.merge() lacks a `key` argument, but it would be very useful:
        http://groups.google.com/group/comp.lang.python/t/52ed18a35654d2b1/
    
    Python syntax as a friendlier alternative to those cryptic functional
    languages
        http://groups.google.com/group/comp.lang.python/t/5f02a42f22e896f3/
    On a third hand, JRM argues that tail recursion would only help
    Python, despite the decisions of BDFL.
	http://funcall.blogspot.com/2009/05/you-knew-id-say-something-part-iii.html
    
    The right way to use an "else" clause in a try/except/else:
        http://groups.google.com/group/comp.lang.python/t/c599b522d4e59f54/
    
    Simple way of handling and logging errors:
        http://groups.google.com/group/comp.lang.python/t/4a77fa363f247f78/
        http://groups.google.com/group/comp.lang.python/t/fd85bc9de4a23713/
    
    Experienced Pythonistas comment on a simple program:
        http://groups.google.com/group/comp.lang.python/t/5ac3a909e38c4ee4/
    
    Serving an image in a web application does not necesarily require a file
    stored on disk:
        http://groups.google.com/group/comp.lang.python/t/721d5e6ab3b1cbd7/
    
    Double-clicking a .py file doesn't work: how to fix file associations
    on Windows
        http://groups.google.com/group/comp.lang.python/t/8837a113342c63bc/
    
    A long thread, started as a request for comments on PEP 382, now
    discussing how evil .pth files are, and other issues involving eggs,
    setuptools, easy _install, distutils and even GNU stow:
        http://groups.google.com/group/comp.lang.python/t/aebfb3311a2f5eb6/
    
    In case you missed it: 'import antigravity' in action!
        http://groups.google.com/group/comp.lang.python/t/9e8d5ebb5423b0af/
    

========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiasts":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
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	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    Enjoy the *Python Magazine*.
	http://pymag.phparch.com/

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

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From maymunbeyin at gmail.com  Thu May 14 17:38:55 2009
From: maymunbeyin at gmail.com (kk)
Date: Thu, 14 May 2009 14:38:55 -0700 (PDT)
Subject: Returning dictionary from a function
Message-ID: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>

Hi

I am working on something here and I cannot get the full dictionary
out of a function. I am sure I am missing something here.

Anyways here is a simple code that repeats my problem. Basically I am
just trying to get that values function to return the diky as a
dictionary so that I can query values later.

thanks




def values(x):
    diky={}
    for a in range(x):
        a=a+100
        diky={chr(a):a}

        print diky
    return diky


b=values(5)
print type(b),len(b), b['f'] # gives error
print type(b),len(b), b['h'] # does not give error


From gunterhenriksen at gmail.com  Thu May 14 17:40:27 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Thu, 14 May 2009 14:40:27 -0700
Subject: Block-Local Variables using "with"
Message-ID: <ab4fa3490905141440n2cf046b2sf98534e11d05a6f7@mail.gmail.com>

Presuming there is a reason to want block-local variables,
does this seem like a good way to do something like it?

@contextlib.contextmanager
def blocklocal(**kwargs):
    bl = type('', (object,), {})()
    for (k, v) in kwargs.items():
        bl.__setattr__(k, v)
    yield bl
    for k in bl.__dict__.copy():
        bl.__delattr__(k)

with blocklocal(a=12, b="hello") as bl:
    bl.c = "world"
    print(bl.a, bl.b, bl.c)

The "bl" variable would still be there but empty.
Are there cleaner ways? (without nested "def"s)


From norseman at hughes.net  Thu May 14 17:41:24 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 14:41:24 -0700
Subject: How to get the formal args of a function object?
In-Reply-To: <E8ednaCLtPh1HZHXnZ2dnUVZ_jOdnZ2d@pdx.net>
References: <guhrjb$79i$1@reader1.panix.com>
	<E8ednaCLtPh1HZHXnZ2dnUVZ_jOdnZ2d@pdx.net>
Message-ID: <4A0C9004.9070400@hughes.net>

Scott David Daniels wrote:
> kj wrote:
>> Suppose that f is an object whose type is 'function'.
>>
>> Is there a way to find out f's list of formal arguments?
>>
>> The reason for this is that I'm trying to write a decorator and
>> I'd like the wrapper to be able to check the number of arguments
>> passed....but I'm missing something like the hypothetical attribute
>> FORMAL_ARGS above.
> 
> I can write a wrapper now:
> 
>     def tracer(function):
>         def internal(*args, **kwargs):
>             print('calling %s(%s)' % (function.__name__,
>                     ', '.join([repr(arg) for arg in args] +
>                               ['%s=%r' % ka for ka in sorted(kwargs)])))
>             result = function(*args, **kwargs)
>             print('=> %r' % result)
>         return internal
> 
> and call like so:
>     tracer(math.sin)(3.1415 / 6)
> 
>     calling sin(0.5235833333333334)
>     => 0.49998662654663256
> 
> What would your missing something be for tracer(math.sin)?
> 
> --Scott David Daniels
> Scott.Daniels at Acm.Org
=========================
Scott;
I'm lost with this.

If you use the same and add that it prints both the first_token/second 
and the first_token multiplied by second and pass it (pi, 6, 7)  what 
happens then?

ie - function mysin only expects pi and 6 and is to print both pi/6 and 
pi*6.  The 7 is an error, not supposed to be there.



Steve


From maymunbeyin at gmail.com  Thu May 14 17:44:44 2009
From: maymunbeyin at gmail.com (kk)
Date: Thu, 14 May 2009 14:44:44 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
Message-ID: <c846db84-c3a1-41cf-8d27-c7038aa7fe25@o14g2000vbo.googlegroups.com>

Btw my main problem is that when I assign the function to 'b' variable
I only get the last key from the dictionary. Sorry about that I forgot
to mention the main issue.


From tjreedy at udel.edu  Thu May 14 17:51:25 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 14 May 2009 17:51:25 -0400
Subject: introspection question: get return type
In-Reply-To: <guhsvv$cu$1@panix3.panix.com>
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>	<4a0c1a0e$0$31748$426a74cc@news.free.fr>	<%bXOl.15204$Ux.561@tornado.fastwebnet.it>	<4a0c6e42$0$12031$426a74cc@news.free.fr>
	<guhsvv$cu$1@panix3.panix.com>
Message-ID: <gui3ot$vmi$1@ger.gmane.org>

Aahz wrote:
> In article <4a0c6e42$0$12031$426a74cc at news.free.fr>,
> Bruno Desthuilliers  <bdesth.quelquechose at free.quelquepart.fr> wrote:
>> Marco Mariani a ?crit :
>>> Bruno Desthuilliers wrote:
>>>> Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
>>>> sense given Python's dynamic typing.
>>> Unless he's really trying to write in Nohtyp,
>> You meant "Notype" ?-)
> 
> Marco's spelling is correct.

Right. Nohtyp is an abbreviation for Noh-type, which is very traditionalist.

> Try "Nohtyp".reverse()

which give us the anti-traditionalist (Monty) Python style of play.

tjr






From bearophileHUGS at lycos.com  Thu May 14 17:55:10 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 14 May 2009 14:55:10 -0700 (PDT)
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.29.1242119171.8015.python-list@python.org> 
	<043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com> 
	<83b176cc-dce5-4fb8-a4bb-b9151f59ee9c@z7g2000vbh.googlegroups.com> 
	<m2eiurjswh.fsf@cs.uu.nl>
Message-ID: <631bec2d-f9ee-47cd-85ef-acdee69a3504@r34g2000vbi.googlegroups.com>

Piet van Oostrum:
> You may not have seen it, but Fortran and Algol 60 belong to that
> category.

I see. It seems my ignorance is unbounded, even for the things I like.
I am very sorry.

Bye,
bearophile


From tjreedy at udel.edu  Thu May 14 17:56:06 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 14 May 2009 17:56:06 -0400
Subject: python copy method alters type
In-Reply-To: <4A0C1722.4050600@gmail.com>
References: <4A0C1722.4050600@gmail.com>
Message-ID: <gui41l$vmi$2@ger.gmane.org>

Zhenhai Zhang wrote:
> Really weired; Here is my code:
> 
>    a = ["a", 1, 3, 4]
>    print "a:", a
>      c = copy(a)

SyntaxError: unexpected indent
If you correct that, you would get a NameError

>    c[0] = "c"
>    c[1] = 2
>    print "c:", c
>    print "a:",a

When posting, copy and paste the complete code that you actually ran to 
get the purported output.



From jeff at jmcneil.net  Thu May 14 18:00:16 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Thu, 14 May 2009 15:00:16 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
	<c846db84-c3a1-41cf-8d27-c7038aa7fe25@o14g2000vbo.googlegroups.com>
Message-ID: <25219b52-9650-40d5-b31b-6bf55e2875be@z5g2000vba.googlegroups.com>

On May 14, 5:44?pm, kk <maymunbe... at gmail.com> wrote:
> Btw my main problem is that when I assign the function to 'b' variable
> I only get the last key from the dictionary. Sorry about that I forgot
> to mention the main issue.


You're creating a new dictionary with each iteration of your loop, use
d[k] = v syntax instead.


From deets at nospam.web.de  Thu May 14 18:01:25 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 15 May 2009 00:01:25 +0200
Subject: Returning dictionary from a function
In-Reply-To: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
Message-ID: <773ilmF1f2uflU1@mid.uni-berlin.de>

kk schrieb:
> Hi
> 
> I am working on something here and I cannot get the full dictionary
> out of a function. I am sure I am missing something here.
> 
> Anyways here is a simple code that repeats my problem. Basically I am
> just trying to get that values function to return the diky as a
> dictionary so that I can query values later.
> 
> thanks
> 
> 
> 
> 
> def values(x):
>     diky={}
>     for a in range(x):
>         a=a+100
>         diky={chr(a):a}
> 
>         print diky
>     return diky
> 
> 
> b=values(5)
> print type(b),len(b), b['f'] # gives error
> print type(b),len(b), b['h'] # does not give error

You are creating a new dictionary over and over.

dikiy[chr(a)] = a

is what you want inside the loop.

Diez


From jenn.duerr at gmail.com  Thu May 14 18:02:13 2009
From: jenn.duerr at gmail.com (noydb)
Date: Thu, 14 May 2009 15:02:13 -0700 (PDT)
Subject: putting date strings in order
References: <dc7e9d9c-5957-45ab-9228-70dafbe46e7a@n4g2000vba.googlegroups.com>
	<guhn01$j0r$03$1@news.t-online.com>
	<UImdnbqCOMOL55HXnZ2dnUVZ_gCdnZ2d@pdx.net>
Message-ID: <b1a0f614-fae0-4b5b-8c14-5b4cf8a6dc73@t11g2000vbc.googlegroups.com>

On May 14, 4:13?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> Peter Otten wrote:
> > Hm, if ordered_raster_list is guaranteed to contain one string item for
> > every month the above can be simplified to
>
> > months = [
> > ? ? 'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr',
> > ? ? 'precip_may', 'precip_jun', 'precip_jul', 'precip_aug',
> > ? ? 'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec']
>
> > start = 2
> > ordered_raster_list = months[start-1:] + months[:start-1]
>
> Or even:
> ?>
> ? ? ?multi_months = [
> ? ? ? ? ?'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr',
> ? ? ? ? ?'precip_may', 'precip_jun', 'precip_jul', 'precip_aug',
> ? ? ? ? ?'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec'] * 2
> ? ? ?start = 2
> ? ? ?ordered_raster_list = multi_months[start - 1: start + 11]
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

Peter and Scott --

ordered_raster_list is guaranteed to have one string item for all 12
months -- it is just NOT guaranteed to have those in chronological
order, which is what is required, whether the data starts in january
(thus ending in dec of same year) or august (thus ending in jul of the
following year) or whenever.  The initial order of the list is
dictated by when the raster (precip_<month>) was added to it's
container.  One would hope the rasters would be added in order, but I
cannot count on that and shouldn't.


From smarden1 at gmail.com  Thu May 14 18:03:43 2009
From: smarden1 at gmail.com (smarden1 at gmail.com)
Date: Thu, 14 May 2009 15:03:43 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
	<c846db84-c3a1-41cf-8d27-c7038aa7fe25@o14g2000vbo.googlegroups.com>
Message-ID: <b207f7a9-91f7-46e2-bd0f-e44a40ba431a@n8g2000vbb.googlegroups.com>

def values(x):
    diky={}
    for a in range(x):
        a=a+100
        diky[chr(a)] = a
    return diky

it is not working b/c you are creating a new dictionary with each
iteration of the loop, rather you want to update the same dictionary
with the new value you have..


From bearophileHUGS at lycos.com  Thu May 14 18:04:20 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 14 May 2009 15:04:20 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
Message-ID: <82799f8e-fe84-426a-b236-44a4b821b652@g19g2000vbi.googlegroups.com>

kk:
>I am sure I am missing something here.<

This instruction created a new dicky dict for every iteration:
diky={chr(a):a}

What you want is to add items to the same dict, that you later output.
The normal way to do it is:
diky[chr(a)] = a

Your fixed code:

def values(x):
    diky = {}
    for i in xrange(x):
        i += 100
        diky[chr(i)] = i
    print diky
    return diky

b = values(5)
print type(b), len(b), b['f']
print type(b), len(b), b['h']

Bye,
bearophile


From google at mrabarnett.plus.com  Thu May 14 18:04:41 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 23:04:41 +0100
Subject: how to import MV module
In-Reply-To: <9DCDC50A-C057-4A2A-BE20-3F08A6DE5F86@gmail.com>
References: <9DCDC50A-C057-4A2A-BE20-3F08A6DE5F86@gmail.com>
Message-ID: <4A0C9579.6030709@mrabarnett.plus.com>

guangshan chen wrote:
> Hi all,
> 
> I am new. I just want to run a python program.
> 
> When I run it, python can not find MV module. The follow is the error 
> information:
> Traceback (most recent call last):
>   File "MakeCouplerRestart.py", line 22, in <module>
>     import MV,struct,Numeric,string
> ImportError: No module named MV
> 
> Could any one tell me how to import MV module. Where is it?
> 
It's not a standard part of Python.

I've Googled for it and I've found a website about climate data
analysis:

http://www2-pcmdi.llnl.gov/

Is that what you're doing?


From google at mrabarnett.plus.com  Thu May 14 18:08:55 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 23:08:55 +0100
Subject: Returning dictionary from a function
In-Reply-To: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
Message-ID: <4A0C9677.2010100@mrabarnett.plus.com>

kk wrote:
> Hi
> 
> I am working on something here and I cannot get the full dictionary
> out of a function. I am sure I am missing something here.
> 
> Anyways here is a simple code that repeats my problem. Basically I am
> just trying to get that values function to return the diky as a
> dictionary so that I can query values later.
> 
> thanks
> 
> 
> 
> 
> def values(x):
>     diky={}
>     for a in range(x):
>         a=a+100
>         diky={chr(a):a}

Here you're discarding the current dict and assigning another to diky.
It think you mean:

         diky[chr(a)] = a

> 
>         print diky

Here you're printing out the entire dict.

>     return diky
> 
> 
> b=values(5)
> print type(b),len(b), b['f'] # gives error
> print type(b),len(b), b['h'] # does not give error



From maymunbeyin at gmail.com  Thu May 14 18:10:46 2009
From: maymunbeyin at gmail.com (kk)
Date: Thu, 14 May 2009 15:10:46 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
	<82799f8e-fe84-426a-b236-44a4b821b652@g19g2000vbi.googlegroups.com>
Message-ID: <cedce272-74cc-4524-b3e5-d716f562ad1f@o30g2000vbc.googlegroups.com>

Hi


Thank you so much. It makes perfect sense. I actually tried the second
suggested syntax before posting here but it was inside of my actual
code which probably had another problem. The suggested solution works
perfectly.

thanks again



From google at mrabarnett.plus.com  Thu May 14 18:13:58 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 23:13:58 +0100
Subject: Nimrod programming language
In-Reply-To: <631bec2d-f9ee-47cd-85ef-acdee69a3504@r34g2000vbi.googlegroups.com>
References: <159308160@web.de>	<mailman.29.1242119171.8015.python-list@python.org>
	<043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>
	<83b176cc-dce5-4fb8-a4bb-b9151f59ee9c@z7g2000vbh.googlegroups.com>
	<m2eiurjswh.fsf@cs.uu.nl>
	<631bec2d-f9ee-47cd-85ef-acdee69a3504@r34g2000vbi.googlegroups.com>
Message-ID: <4A0C97A6.9030301@mrabarnett.plus.com>

bearophileHUGS at lycos.com wrote:
> Piet van Oostrum:
>> You may not have seen it, but Fortran and Algol 60 belong to that
>> category.
> 
> I see. It seems my ignorance is unbounded, even for the things I like.
> I am very sorry.
> 
Some early versions of Basic were also flexible when it came to spaces.
The example I remember is:

     FORD=STOP

Variable name were a single letter, optionally followed by a digit, so
that's:

     FOR D = S TO P


From mgedmin at gmail.com  Thu May 14 18:15:23 2009
From: mgedmin at gmail.com (Marius Gedminas)
Date: Thu, 14 May 2009 15:15:23 -0700 (PDT)
Subject: Q's on my first python script
References: <gu6im5$1hi$1@reader1.panix.com>
	<slrnh0fpu5.qcl.nick@irishsea.home.craig-wood.com>
Message-ID: <7daf793f-a411-4dee-967c-30c180e91bb2@s20g2000vbp.googlegroups.com>

On May 11, 12:30?pm, Nick Craig-Wood <n... at craig-wood.com> wrote:
> ? ? def __init__(self):
> ? ? ? ? usage = '''Usage: %prog [options] YYMMDD
> ? ? ? ? ? ?%prog -h|--help
> '''
> ? ? ? ? parser = OptionParser(usage=usage)
> ? ? ? ? parser.add_option("-n", "--no-newline", dest="nonl",
> ? ? ? ? ? ? ? ? ? ? ? ? ? action="store_true", help="omit newline in output")
> ? ? ? ? (options, args) = parser.parse_args();
> ? ? ? ? try:
> ? ? ? ? ? ? weekday = self.wkday_abbrev(args[0])
> ? ? ? ? except BadDateString, e:
> ? ? ? ? ? ? print usage
> ? ? ? ? ? ? print e
> ? ? ? ? ? ? sys.exit(1)

I would recommend printing error messages to sys.stderr.

BTW, in this particular case you may want to use

             parser.error(e)

instead of print + sys.exit.

--
Marius Gedminas


From mgedmin at gmail.com  Thu May 14 18:18:54 2009
From: mgedmin at gmail.com (Marius Gedminas)
Date: Thu, 14 May 2009 15:18:54 -0700 (PDT)
Subject: Q's on my first python script
References: <gu6im5$1hi$1@reader1.panix.com>
	<0216ec41$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <eda22636-4843-42f5-acc6-0e487f1b5f34@e23g2000vbe.googlegroups.com>

On May 10, 6:56?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> > 4. What's the python way to emit warnings? ?(The script below should
> > ? ?warn the user that arguments after the first one are ignored.)
>
> import warnings
> warnings.warn("The end of the world is coming!")

The warnings module is used for warnings about program code, not user
input.

import logging
logging.warn("Oh noes, you passed me two arguments instead of one!")

--
Marius Gedminas


From gchen9 at gmail.com  Thu May 14 18:23:20 2009
From: gchen9 at gmail.com (guangshan chen)
Date: Thu, 14 May 2009 17:23:20 -0500
Subject: how to import MV module
In-Reply-To: <4A0C9579.6030709@mrabarnett.plus.com>
References: <9DCDC50A-C057-4A2A-BE20-3F08A6DE5F86@gmail.com>
	<4A0C9579.6030709@mrabarnett.plus.com>
Message-ID: <876A68CE-604E-48E0-869D-F7A5C1410DCB@gmail.com>

Hi MRAB,

Thanks. That is not what I am doing.
It seems only there is MV module used. I also googled a lot.

I just try to delete MV in the program. I found the program still can  
be run without any problem.
So maybe the MV module is not used.

Guangshan

On May 14, 2009, at 5:04 PM, MRAB wrote:

> guangshan chen wrote:
>> Hi all,
>> I am new. I just want to run a python program.
>> When I run it, python can not find MV module. The follow is the  
>> error information:
>> Traceback (most recent call last):
>>   File "MakeCouplerRestart.py", line 22, in <module>
>>     import MV,struct,Numeric,string
>> ImportError: No module named MV
>> Could any one tell me how to import MV module. Where is it?
> It's not a standard part of Python.
>
> I've Googled for it and I've found a website about climate data
> analysis:
>
> http://www2-pcmdi.llnl.gov/
>
> Is that what you're doing?
> -- 
> http://mail.python.org/mailman/listinfo/python-list



From sjmachin at lexicon.net  Thu May 14 18:24:52 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 14 May 2009 15:24:52 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
Message-ID: <bb03595e-5c70-4fbc-87f4-abfd4e1d281b@g22g2000pra.googlegroups.com>

On May 15, 7:38?am, kk <maymunbe... at gmail.com> wrote:
> Hi
>
> I am working on something here and I cannot get the full dictionary
> out of a function. I am sure I am missing something here.
>
> Anyways here is a simple code that repeats my problem. Basically I am
> just trying to get that values function to return the diky as a
> dictionary so that I can query values later.
>
> thanks
>
> def values(x):
> ? ? diky={}
> ? ? for a in range(x):
> ? ? ? ? a=a+100

And you have a SECOND problem ... rebinding your loop counter is
likely to confuse anybody (including yourself!) who tries to
understand (let alone maintain!) your code. If you want a to have
values 0, 100, 200, 300, 400 as the loop is traversed, you should use

   for a in range(0, 500, 100):

or maybe you want 100, ...., 104 which would be produced by
EITHER
   for a in range(100, 105):
OR
   for c in range(5):
       a = c + 100

> ? ? ? ? diky={chr(a):a}

Note that chr(a) will cause an exception when a >= 256 ... do you need
unichr()?

AND what is the point of this dicky diky anyway? Have you considered
the ord() function?

>
> ? ? ? ? print diky
> ? ? return diky
>
> b=values(5)
> print type(b),len(b), b['f'] # gives error
> print type(b),len(b), b['h'] # does not give error

As expected; the last value of a was 104 and ord('h') == 104 ...

HTH,
John


From suruti94 at gmail.com  Thu May 14 18:34:07 2009
From: suruti94 at gmail.com (Mohan Parthasarathy)
Date: Thu, 14 May 2009 15:34:07 -0700
Subject: Circular relationship: object - type
Message-ID: <89dd3da60905141534h339d361ao6171c164c3e7251b@mail.gmail.com>

Hi,

I have read several articles and emails:

http://www.cafepy.com/article/python_types_and_objects/python_types_and_objects.html#relationships-transitivity-figure
http://mail.python.org/pipermail/python-list/2007-February/600128.html

 I understand how type serves to be the default metaclass when an object is
created and it also can be changed. I also read a few examples on why this
metaclass can be a powerful concept. What I fail to understand is the
circular relationship between object and type. Why does type have to be
subclassed from object ? Just to make "Everything is an object and all
objects are  inherited from object class".

Why can't just type be the class from which object class is instantiated ?
Why does it have to be a subclass of object also ?

Sorry if this has been answered before.

Thanks in advance,
mohan
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From trevor.lango at gmail.com  Thu May 14 18:35:23 2009
From: trevor.lango at gmail.com (Trevor)
Date: Thu, 14 May 2009 15:35:23 -0700 (PDT)
Subject: py2exe + win32com + DAO
References: <30bcf41a-f6fe-4580-9735-888fbef419f1@v23g2000pro.googlegroups.com>
	<mailman.66.1242174861.8015.python-list@python.org>
	<9035670f-9057-4f3d-bfbb-5d693d030f62@y6g2000prf.googlegroups.com>
	<mailman.74.1242194642.8015.python-list@python.org>
Message-ID: <275f5c0b-8152-4cf9-b379-abcfaa455bdb@x31g2000prc.googlegroups.com>

I think the problem I am experiencing bears a resemblance to the
content of this post:

http://mail.python.org/pipermail/python-list/2001-February/071421.html

Does anyone know what the GUID for the DAO 3.6 library is (or can
explain how I can find it)?

On May 12, 11:00?pm, David Lyon <david.l... at preisshare.net> wrote:
> On Tue, 12 May 2009 22:06:42 -0700 (PDT), Trevor <trevor.la... at gmail.com>
> wrote:
>
> > I do not believe your assertion applies to the following line of code:
>
> > daoEngine = win32com.client.Dispatch(r'DAO.DBEngine.36')
>
> It doesn't. I'm simply suggesting that it is possible you are opening
> the database in Access or something in Administrator/dba mode. That
> could be causing an exclusive lock on the database so that no sub
> task can then open it.
>
> i have seen this on old versions of Access.
>
> To provide excellent performance, microsoft used to load the whole
> database into memory if it could. And just operate mostly from there.
>
> > is it possible to obtain more
> > verbose error output from Python modules? ?The error message in the
> > original post was generated from:
>
> > print sys.exc_info()[0]
>
> possibly but i'm not sure how...
>
> David



From maymunbeyin at gmail.com  Thu May 14 18:44:17 2009
From: maymunbeyin at gmail.com (kk)
Date: Thu, 14 May 2009 15:44:17 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
	<bb03595e-5c70-4fbc-87f4-abfd4e1d281b@g22g2000pra.googlegroups.com>
Message-ID: <bd50daf8-aa15-4e57-975b-364d392ddd0e@z5g2000vba.googlegroups.com>

John,

Thanks for pointing out the loop issue. I just typed these sloppy
lines the demonstrate the issue, they were not part of any code by any
means.  I will make sure that I will post cleaner lines next time.


From tomf.sessile at gmail.com  Thu May 14 19:01:31 2009
From: tomf.sessile at gmail.com (TomF)
Date: Thu, 14 May 2009 16:01:31 -0700
Subject: Python system with exemplary organization/coding style
Message-ID: <2009051416013116807-tomfsessile@gmailcom>

I'm looking for a medium-sized Python system with very good coding 
style and good code organization, so I can learn from it.  I'm reading 
various books on Python with advice on such things but I'd prefer to 
see a real system.

By medium-sized I mean 5-20 classes, 5-20 files, etc; a code base that 
has some complexity but isn't overwhelming.

Thanks,
-Tom



From debatem1 at gmail.com  Thu May 14 19:18:07 2009
From: debatem1 at gmail.com (CTO)
Date: Thu, 14 May 2009 16:18:07 -0700 (PDT)
Subject: Python system with exemplary organization/coding style
References: <2009051416013116807-tomfsessile@gmailcom>
Message-ID: <fe6abf21-c0ed-426f-b837-0149f4f86858@e20g2000vbc.googlegroups.com>

On May 14, 7:01?pm, TomF <tomf.sess... at gmail.com> wrote:
> I'm looking for a medium-sized Python system with very good coding
> style and good code organization, so I can learn from it. ?I'm reading
> various books on Python with advice on such things but I'd prefer to
> see a real system.
>
> By medium-sized I mean 5-20 classes, 5-20 files, etc; a code base that
> has some complexity but isn't overwhelming.
>
> Thanks,
> -Tom

I'd recommend screenlets. Good documentation and pretty good style,
and
they have some external dependencies so you can see how that operates,
and of course you can see what your code is and isn't doing pretty
quickly.

<URL: http://www.screenlets.org>

Geremy Condra


From benjumanji at googlemail.com  Thu May 14 19:24:49 2009
From: benjumanji at googlemail.com (Benjamin Edwards)
Date: Thu, 14 May 2009 16:24:49 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com> 
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com> 
	<98ea5010-2eab-43de-b5a2-d4f79a06f25e@z19g2000vbz.googlegroups.com> 
	<50902c22-df00-4fb8-bc7b-1f596387ea32@j12g2000vbl.googlegroups.com>
Message-ID: <21ff6d85-3c25-4526-b49d-3525dce15497@z7g2000vbh.googlegroups.com>

On May 13, 8:27?pm, CTO <debat... at gmail.com> wrote:
> On May 13, 8:19?am, bearophileH... at lycos.com wrote:
>
> > godshorse, you may use the "shortestPaths" method of this graph class
> > of mine:http://sourceforge.net/projects/pynetwork/
>
> > (It uses the same Dijkstra code by Eppstein).
> > (Once you have all distances from a node to the other ones, it's not
> > too much difficult to find the tree you talk about).
>
> > Also see the Minimum spanning tree:http://en.wikipedia.org/wiki/Minimum_spanning_tree
>
> > Bye,
> > bearophile
>
> Let me add a caution to what bearophile says here- a minimum spanning
> tree minimizes
> the weight of the *whole tree*, not the individual paths in that tree,
> which seems
> to be what you're going after. Those can be pretty different things.
>
> Geremy Condra

no love for floyds algorithm. so simple :D

http://en.wikipedia.org/wiki/Floyd-Warshall_algorithm


From google at mrabarnett.plus.com  Thu May 14 19:32:02 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 15 May 2009 00:32:02 +0100
Subject: how to import MV module
In-Reply-To: <876A68CE-604E-48E0-869D-F7A5C1410DCB@gmail.com>
References: <9DCDC50A-C057-4A2A-BE20-3F08A6DE5F86@gmail.com>
	<4A0C9579.6030709@mrabarnett.plus.com>
	<876A68CE-604E-48E0-869D-F7A5C1410DCB@gmail.com>
Message-ID: <4A0CA9F2.6070002@mrabarnett.plus.com>

guangshan chen wrote:
> Hi MRAB,
> 
> Thanks. That is not what I am doing.
> It seems only there is MV module used. I also googled a lot.
> 
> I just try to delete MV in the program. I found the program still can be 
> run without any problem.
> So maybe the MV module is not used.
> 
 From the trackback I can see that the module is imported as just "MV",
so if the module is actually being used then "MV" will occur elsewhere
in the program. If it doesn't, then deleting it from that line won't be
a problem, but if it _is_ used elsewhere, then it _will_ be a problem -
and it's just that it hasn't happened yet! :-)

> Guangshan
> 
> On May 14, 2009, at 5:04 PM, MRAB wrote:
> 
>> guangshan chen wrote:
>>> Hi all,
>>> I am new. I just want to run a python program.
>>> When I run it, python can not find MV module. The follow is the error 
>>> information:
>>> Traceback (most recent call last):
>>>   File "MakeCouplerRestart.py", line 22, in <module>
>>>     import MV,struct,Numeric,string
>>> ImportError: No module named MV
>>> Could any one tell me how to import MV module. Where is it?
>> It's not a standard part of Python.
>>
>> I've Googled for it and I've found a website about climate data
>> analysis:
>>
>> http://www2-pcmdi.llnl.gov/
>>
>> Is that what you're doing?
 >



From warhammer1805 at gmail.com  Thu May 14 19:34:01 2009
From: warhammer1805 at gmail.com (Andrew Chung)
Date: Thu, 14 May 2009 16:34:01 -0700
Subject: New to python, can i ask for a little help?
In-Reply-To: <50697b2c0905131358q1399019bsa5417335a19af1a5@mail.gmail.com>
References: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
	<mailman.72.1242188827.8015.python-list@python.org>
	<5638a6de-d07e-48a0-be73-37d81a2ba6cc@y33g2000prg.googlegroups.com>
	<50697b2c0905131358q1399019bsa5417335a19af1a5@mail.gmail.com>
Message-ID: <8bd3c48b0905141634t1cf5469cu36b6f04f141b51e9@mail.gmail.com>

Thank you to all who responded. You were right about the solution. That
helped alot. Now maybe i can ask if anyone has any ideas for learning, such
as websites or videos. I found one that i liked alot.

http://iamar.net/subpages/PythonVid.html

But i wondered how other people learned as beginners in the past?
Again, thank you to all of you who responded so quickly to my question. It
helped alot.

Andrew

On Wed, May 13, 2009 at 1:58 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Wed, May 13, 2009 at 12:22 PM, warhammer1805 at gmail.com
> <warhammer1805 at gmail.com> wrote:
> > On May 12, 9:27 pm, Chris Rebert <c... at rebertia.com> wrote:
> >> On Tue, May 12, 2009 at 9:18 PM, warhammer1... at gmail.com
> >>
> >>
> >>
> >> <warhammer1... at gmail.com> wrote:
> >> > I loaded python 3.1
> >> > I can use the gui and i see the following:
> >>
> >> > Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> >> > (Intel)] on win32
> >> > Type "copyright", "credits" or "license()" for more information.
> >>
> >> > It would seem that this is working correctly and there is no path
> >> > problem.
> >> > I am running windows vista.
> >>
> >> > When i put in a test string i see this:
> >>
> >> > Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> >> > (Intel)] on win32
> >> > Type "copyright", "credits" or "license()" for more information.
> >> >>>> print "hello world!"
> >> > SyntaxError: invalid syntax (<pyshell#0>, line 1)
> >>
> >> > Can anyone tell me what is wrong? I didnt expect that error....
> >>
> >> The print-statement was removed in Python 3.0. Now it's just a
> >> function. You'll have to use:
> >>
> >> print("hello world!")
> >>
> >> instead.
> >>
> >> Please also read the 3.0 transition docs:
> http://docs.python.org/3.0/whatsnew/3.0.html
> >> Note that Python 3.0 differs significantly from Python 2.x
> >>
> >> Cheers,
> >> Chris
> >> --http://blog.rebertia.com
> >
> > Hi Chris,
> > Thank you for the pointer! that sure helped alot.
> > Do you think i should be using a different version of python? I dont
> > normally do much programming. I used to do some C along time ago. I
> > want to get into something again and python seems to be popular.
>
> You should probably use Python v2.6 instead for the time being; most
> libraries have yet to be ported to Python 3.0, so 2.6 has many more
> libraries available for it currently. Python 3.0 is also mostly the
> same as 2.6, so learning 2.6 won't be a waste of time and will help
> you when the full transition to 3.0 is eventually made.
>
> > Could you also tell me who uses python in IT areas? I see alot of
> > python and Mysql. And i see python developer jobs as standalone too.
>
> See http://www.python.org/about/apps/ and
> http://www.python.org/about/success/
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>
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From wescpy at gmail.com  Thu May 14 19:35:08 2009
From: wescpy at gmail.com (wesley chun)
Date: Thu, 14 May 2009 16:35:08 -0700
Subject: [ANN] Introduction to Python course, San Francisco, Jun 2009
In-Reply-To: <78b3a9580904091545w1550330an3e6f06f91f0a4509@mail.gmail.com>
References: <78b3a9580904091545w1550330an3e6f06f91f0a4509@mail.gmail.com>
Message-ID: <78b3a9580905141635x382f0284u9e69a0917d4d291b@mail.gmail.com>

* FINAL REMINDER *

we have about 10-15 spaces remaining for our June course coming up in
about a month. if you have coworkers or colleagues that need to learn
Python, the weather is great up here in northern california in the
city by the bay.

there are discounts for students and teachers, as well as for
companies sending more than one attendee. finally, in this economic
crisis, if you can show you've been laidoff and collecting
unemployment, we can offer you financial aid as well.

the course will NOT be cancelled so you can make your travel
arrangements as well. hope to see you in class!

cheers,
-wesley


On Thu, Apr 9, 2009 at 3:45 PM, wesley chun <wescpy at gmail.com> wrote:
> Need to get up-to-speed with Python as quickly as possible? Come join
> me, Wesley Chun, author of Prentice-Hall's bestseller "Core Python
> Programming," for a comprehensive intro course coming up this June in
> beautiful Northern California! Please pass on this note to whomever
> you think may be interested. I look forward to meeting you and your
> colleagues!
>
> (Comprehensive) Introduction to Python
> Mon-Wed, 2009 Jun 15-17, 9am-5pm
>
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> (COMPREHENSIVE) INTRODUCTION TO PYTHON
>
> Although this course may appear to those new to Python, it is also
> perfect for those who have tinkered with it and want to "fill in the
> gaps" and/or want to get more in-depth formal training. ?It combines
> the best of both an introduction to the language as well as a "Python
> Internals" training course.
>
> We will immerse you in the world of Python in only a few days, showing
> you more than just its syntax (which you don't really need a book to
> learn, right?). Knowing more about how Python works under the covers,
> including the relationship between data objects and memory management,
> will make you a much more effective Python programmer coming out of
> the gate. 3 hands-on labs each day will help hammer the concepts home.
>
> Come find out why Google, Yahoo!, Disney, ILM/LucasFilm, VMware, NASA,
> Ubuntu, YouTube, Slide, and Red Hat all use Python. Users supporting
> or jumping to Plone, Zope, TurboGears, Pylons, Django, Google App
> Engine, Jython, IronPython, and Mailman will also benefit!
>
> FREE PREVIEW 1: you will find (and can download) a video clip of a
> live lesson that was delivered recently to get an idea of the lecture
> style and interactive classroom environment at:
>
> http://cyberwebconsulting.com (click "Python Training")
>
> FREE PREVIEW 2: Partnering with O'Reilly and Pearson, Safari Books
> Online has asked me to deliver a 1-hour webcast on Wednesday morning
> 2009 Apr 29 @ 10:30a PDT/1:30p EDT called <B><I>What is
> Python?</I></B>. This will be an online seminar based on a session
> that I've delivered at numerous conferences in the past. It will give
> you an idea of lecture style as well as an overview of the material
> covered in the course. Plus the first 10 registrants will receive an
> autographed copy of <B><I>Core Python Programming</I></B>! For more
> information:
>
> http://www.safaribooksonline.com/events/WhatIsPython.html
>
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>
> WHERE: near the San Francisco Airport (SFO/San Bruno), CA, USA
>
> WEB: ? http://cyberwebconsulting.com (click "Python Training")
>
> FLYER: http://starship.python.net/crew/wesc/flyerPP1jun09.pdf
>
> LOCALS: easy freeway (101/280/380) with lots of parking plus public
> transit (BART and CalTrain) access via the San Bruno stations, easily
> accessible from all parts of the Bay Area
>
> VISITORS: free shuttle to/from the airport, free high-speed internet,
> free breakfast and regular evening receptions; fully-equipped suites
>
> See website for costs, venue info, and registration. ?Discounts are
> available for multiple registrations as well as for teachers/students.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
"Core Python Programming", Prentice Hall, (c)2007,2001
"Python Fundamentals", Prentice Hall, (c)2009
    http://corepython.com

"Python Web Development with Django", Addison Wesley, (c) 2009
http://withdjango.com

wesley.j.chun :: wescpy-at-gmail.com
python training and technical consulting
cyberweb.consulting : silicon valley, ca
http://cyberwebconsulting.com


From Scott.Daniels at Acm.Org  Thu May 14 19:43:21 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 14 May 2009 16:43:21 -0700
Subject: How to get the formal args of a function object?
In-Reply-To: <mailman.166.1242337262.8015.python-list@python.org>
References: <guhrjb$79i$1@reader1.panix.com>	<E8ednaCLtPh1HZHXnZ2dnUVZ_jOdnZ2d@pdx.net>
	<mailman.166.1242337262.8015.python-list@python.org>
Message-ID: <CKKdnflL2YTENpHXnZ2dnUVZ_iydnZ2d@pdx.net>

norseman wrote:
> Scott David Daniels wrote:
>> kj wrote:
>>> Suppose that f is an object whose type is 'function'.
>>> Is there a way to find out f's list of formal arguments?...
>>
>> I can write a wrapper now:
>>     def tracer(function):
>>         def internal(*args, **kwargs):
>>             print('calling %s(%s)' % (function.__name__,
>>                     ', '.join([repr(arg) for arg in args] +
>>                               ['%s=%r' % ka for ka in sorted(kwargs)])))
>>             result = function(*args, **kwargs)
>>             print('=> %r' % result)
>>         return internal
>> and call like so:
>>     >>>tracer(math.sin)(3.1415 / 6)
>>     calling sin(0.5235833333333334)
>>     => 0.49998662654663256
>> What would your missing something be for tracer(math.sin)?
> Scott;
> I'm lost with this.

Sorry, I was too telegraphic.  I was pointing out that my wrapper
function (and, indeed, lots of Python code) does something and
passes along whatever args it got.  It's obvious tracer takes a
single arg, but, tracer(math.sin) takes a single arg, while
tracer(math.atan2) takes two args.  If what your code gets is
one of these wrapped functions, it will be tricky to figure out
what the eventual arg list needed will be.

--Scott David Daniels
Scott.Daniels at Acm.Org


From rhodri at wildebst.demon.co.uk  Thu May 14 19:44:09 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 15 May 2009 00:44:09 +0100
Subject: Odd list behavior
In-Reply-To: <4A0C4B9D.20301@hughes.net>
References: <4A0B40E0.2060600@gmail.com> <4A0B44DA.2040107@hughes.net>
	<op.utv27casa8ncjz@gnudebst> <4A0C4B9D.20301@hughes.net>
Message-ID: <op.utx1jvbda8ncjz@gnudebst>

On Thu, 14 May 2009 17:49:33 +0100, norseman <norseman at hughes.net> wrote:

> Rhodri James wrote:
>> On Wed, 13 May 2009 23:08:26 +0100, norseman <norseman at hughes.net>  
>> wrote:
>>
>>> Evan Kroske wrote:
>>>> I'm working on a simple file processing utility, and I encountered a  
>>>> weird error. If I try to get the first element of a list I'm  
>>>> splitting from a string, I get an error:
>>>>  key = string.split()[0]
>>>> Error!
>>>>  However, I can slice the list like normal, but that gives me a  
>>>> one-element-long list:
>>>>  key = string.split()[:1]
>>>> Success!
>>>>  Finally, the operation works perfectly if I initialize the list  
>>>> beforehand:
>>>>  list = string.split()
>>>> key = list[0]
>>>> Success!
>>>>  Why does this happen?
>>
>>>
>>> ==========================
>>> Take a look at the  split() command.
>>>
>>> I think you will find you need one var on the left side for each piece  
>>> on the right.
>>  Given that he's immediately indexing the split results, that's  
>> irrelevant.
>> There's no point in even guessing with out the traceback.
>>

> "...the first element of a list..."
> "key = string.split()[0]"
> if the list is a list of tuples the error message is correct.

What error message?  The OP still hasn't told us what error he got.

In any case, you aren't correct.  First, the str.split() method
returns a list of strings, so there are no tuples in sight.  Second,
even if it did, all that means is that "key" is a tuple, which it's
perfectly well allowed to be.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From sjmachin at lexicon.net  Thu May 14 19:48:08 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 14 May 2009 16:48:08 -0700 (PDT)
Subject: How to get all named args in a dict?
References: <guffbh$7do$1@reader1.panix.com>
	<mailman.113.1242254593.8015.python-list@python.org> 
	<guhepj$frm$1@reader1.panix.com>
	<mailman.158.1242328059.8015.python-list@python.org> 
	<guhu4u$i38$1@reader1.panix.com>
	<mailman.160.1242333295.8015.python-list@python.org>
Message-ID: <02645689-2ed2-4b51-b986-b356d6e9ed9a@j18g2000prm.googlegroups.com>

On May 15, 6:24?am, Jason Tackaberry <t... at urandom.ca> wrote:
> On Thu, 2009-05-14 at 20:15 +0000, kj wrote:
> > That problem is easily solved: just make "x = locals()" the first
> > statement in the definition of foo.
>
> That doesn't solve the problem. ?You'd need locals().copy()

Dave's solution doesn't formally solve the problem because x is the
first arg of foo and re-binding x to locals() is not a good idea if
you need to use the passed-in args before calling bar().

Adding .copy() is necessary only if for some weird reason you want to
call locals() *again* before calling bar().

| >>> def foo(x=None, y=None, z=None):
| ...     d = locals()
| ...     print d
| ...     p = 100
| ...     print d
| ...     print locals()
| ...     print d
| ...
| >>> foo(1,2,3)
| {'y': 2, 'x': 1, 'z': 3}
| {'y': 2, 'x': 1, 'z': 3}
| {'y': 2, 'x': 1, 'z': 3, 'd': {...}, 'p': 100}
| {'y': 2, 'x': 1, 'z': 3, 'd': {...}, 'p': 100}
| >>>

Bonus: not only a side-effect, but a recursive one.

Like the manual says, _*UPDATE*_ and return a dictionary ...

HTH,
John


From davea at ieee.org  Thu May 14 20:46:49 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 14 May 2009 20:46:49 -0400
Subject: How to get all named args in a dict?
In-Reply-To: <guhu4u$i38$1@reader1.panix.com>
References: <guffbh$7do$1@reader1.panix.com>	<mailman.113.1242254593.8015.python-list@python.org>	<guhepj$frm$1@reader1.panix.com>	<mailman.158.1242328059.8015.python-list@python.org>
	<guhu4u$i38$1@reader1.panix.com>
Message-ID: <4A0CBB79.3080105@ieee.org>

kj wrote:
> In <mailman.158.1242328059.8015.python-list at python.org> Dave Angel <davea at ieee.org> writes:
>
>
>
>   
>> kj wrote:
>>     
>>> In <mailman.113.1242254593.8015.python-list at python.org> Terry Reedy <tjreedy at udel.edu> writes:
>>>
>>>   
>>>       
>>>> kj wrote:
>>>>     
>>>>         
>>>>> Suppose I have the following:
>>>>>
>>>>> def foo(x=None, y=None, z=None):
>>>>>     d = {"x": x, "y": y, "z": z}
>>>>>     return bar(d)
>>>>>
>>>>> I.e. foo takes a whole bunch of named arguments and ends up calling
>>>>> a function bar that takes a single dictionary as argument, and this
>>>>> dictionary has the same keys as in foo's signature, so to speak.
>>>>>
>>>>> Is there some builtin variable that would be the same as the variable
>>>>> d, and would thus obviate the need to explicitly bind d?
>>>>>       
>>>>>           
>>>   
>>>       
>>>> Use the built-in function locals()
>>>>     
>>>>         
>>>>>>> def f(a,b):
>>>>>>>           
>>>>>>>               
>>>> 	x=locals()
>>>> 	print(x)
>>>>     
>>>>         
>>>   
>>>       
>>>>>>> f(1,2)
>>>>>>>           
>>>>>>>               
>>>> {'a': 1, 'b': 2}
>>>>     
>>>>         
>>> That's *exactly* what I was looking for.  Thanks!
>>>
>>> kynn
>>>
>>>
>>>   
>>>       
>> You already had a better answer from Chris Rebert:
>>     
>
>   
>> def foo(**kwargs):
>>    return bar(kwargs)
>>     
>
>   
>> kwargs at this point is exactly a dictionary of the named arguments to foo.
>>     
>
> I disagree.  If I defined foo as you show above, then there is no
> error checking on the named parameters passed to foo; anything
> goes.
>
>   
>> Because if you try to do anything in this function, you'll probably be 
>> adding more local variables. And then they'd be passed to bar as well.
>>     
>
> That problem is easily solved: just make "x = locals()" the first
> statement in the definition of foo.
>
> kynn
>   
Well, you caught me by surprise.  The name and number of locals is 
determined at compile time, not at run time.  But when I run an 
experiment, it seems you're right, that the dict changes as the function 
executes.

In Python 2.62 at least, the following function gives the following results:

def myfunc(x, y):
    print  locals()
    s = 42
    print locals()

myfunc(y=12, x=33)

{'y': 12, 'x': 33}
{'y': 12, 'x': 33, 's': 42, 'r': {'y': 12, 'x': 33}}
{'y': 12, 'x': 33}


So, if one wanted to call bar, but not till after one had defined new 
locals, you could do the following:

def foo(x=None, y=None, z=None):
     args = locals().copy()
     a = new stuff
     dosomestuff with a, and maybe y
     bar(args)

A shallow copy would be adequate in this case.

Thanks for the correction.


From pavlovevidence at gmail.com  Thu May 14 21:00:26 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 14 May 2009 18:00:26 -0700 (PDT)
Subject: Need advice on distributing small module
References: <guhuqf$h3u$1@reader1.panix.com>
Message-ID: <99246143-a853-4041-bc45-eeb648388cc4@r3g2000vbp.googlegroups.com>

On May 14, 1:26?pm, kj <so... at 987jk.com.invalid> wrote:
> I've written a tiny module that I'd like to make available online
> from my website. ?This module is not "production-grade" code; it
> is meant only as an illustration, but still I'd like to make its
> download and installation as painless as possible.
>
> I could simply bundle everything into a .tgz file, but I'd like
> the distribution to conform to the expectations of Python users,
> as far as the installation sequence is concerned. ?I'm fairly new
> to Python, and would appreciate your advice on this last point.

First of all, if it's just a single module, I recommend that one of
the options is to allow the file to be downloaded as-is, with no
packaging, because a lot of Python users would find it least
cumbersome to simply drop the file right into the site-packages
directory.  The README file would be a separate download or just a
page on the website.

For more official-looking packages, you want to create a setup.py file
that lists your module's build information and meta-information.  Read
the section of the Python documentation entitled "Distributing Python
Modules" for information on how to write a setup file.  Once you write
it, you can run python setup.py sdist and it'll build a distrribution
for you.


> The module has only one non-standard dependency, described by the
> following code:
>
> if sys.version_info[:2] >= (2, 6):
> ? ? import json
> else:
> ? ? import simplejson as json
>
> If possible, I'd like to make distribution procedure such that if
> necessary it also installs json or simplejson (as the case may be).

Next recommendation: just tell your users to download and install json
if they want to use the module.  A small demo module shouldn't be
taking the initiative to install a fairly large package on the user's
behalf.

Furthermore, some users have extreme hatred for software that
"helpfully" downloads and installs other packages without asking
first.

If you want to proceed along these lines in spite of this, the way to
do it is to add some information to setup.py that lists dependencies.
There is a script, easy_install.py, that uses this information to
install dependencies automatically.  However, I don't know the details
of how to do that.


Carl Banks


From george.sakkis at gmail.com  Thu May 14 21:07:47 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Thu, 14 May 2009 18:07:47 -0700 (PDT)
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<4a0c1a0e$0$31748$426a74cc@news.free.fr>
	<%bXOl.15204$Ux.561@tornado.fastwebnet.it> 
	<4a0c6e42$0$12031$426a74cc@news.free.fr> <guhsvv$cu$1@panix3.panix.com>
Message-ID: <6fbab70a-9c53-49cf-8a24-e83230d0e0a7@l28g2000vba.googlegroups.com>

On May 14, 3:55?pm, a... at pythoncraft.com (Aahz) wrote:
> In article <4a0c6e42$0$12031$426a7... at news.free.fr>,
> Bruno Desthuilliers ?<bdesth.quelquech... at free.quelquepart.fr> wrote:
>
> >Marco Mariani a ?crit :
> >> Bruno Desthuilliers wrote:
>
> >>> Oh, you meant the "return type" ? Nope, no way. It just doesn't make
> >>> sense given Python's dynamic typing.
>
> >> Unless he's really trying to write in Nohtyp,
>
> >You meant "Notype" ?-)
>
> Marco's spelling is correct. ?Try "Nohtyp".reverse()

I tried it:

>>> "Nohtyp".reverse()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'str' object has no attribute 'reverse'

This newfangled Nohtyp language is no good, I want my money back.

George


From david.lyon at preisshare.net  Thu May 14 21:31:42 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Thu, 14 May 2009 21:31:42 -0400
Subject: capture stdout and stderror from within a Windows
	=?UTF-8?Q?Service=3F?=
In-Reply-To: <fbKdndszhZhu3pHXnZ2dnUVZ_uydnZ2d@posted.visi>
References: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
	<fbKdndszhZhu3pHXnZ2dnUVZ_uydnZ2d@posted.visi>
Message-ID: <c817eb8e9dad16e0834ce0690776102c@preisshare.net>

On Thu, 14 May 2009 11:16:51 -0500, Grant Edwards <invalid at invalid> wrote:
> On 2009-05-14, Chris Curvey <ccurvey at gmail.com> wrote:
>> I'm trying to get this invocation right, and it is escaping me.  How
>> can I capture the stdout and stderr if I launch a subprocess using
>> subprocess.check_call()?  The twist here is that the call is running
>> from within a Windows service.
>>
>> I've tried:
>>
>> check_call("mycmd.exe", stdout=subprocess.PIPE)  [raises an exception
>> "An integer is required"]
>>
>> check_call("mycmd.exe", stdout=file("c:\\temp\\foobar.txt", "w"))
>> [raises an exception "An integer is required"]

In the past, windows services have never been allowed to make any output
to the console or the GDI or get any user input. Rules said they could 
send stuff to syslog etc.

All writing can go to logfiles and so forth...

I've never heard of that being allowable....

David



From sjmachin at lexicon.net  Thu May 14 21:48:32 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 14 May 2009 18:48:32 -0700 (PDT)
Subject: How to get all named args in a dict?
References: <guffbh$7do$1@reader1.panix.com>
	<mailman.113.1242254593.8015.python-list@python.org> 
	<guhepj$frm$1@reader1.panix.com>
	<mailman.158.1242328059.8015.python-list@python.org> 
	<guhu4u$i38$1@reader1.panix.com>
	<mailman.178.1242348727.8015.python-list@python.org>
Message-ID: <4d634890-b962-4667-b0fb-1ded132f9013@j9g2000prh.googlegroups.com>

On May 15, 10:46?am, Dave Angel <da... at ieee.org> wrote:
> kj wrote:
> > In <mailman.158.1242328059.8015.python-l... at python.org> Dave Angel <da... at ieee.org> writes:
>
> >> kj wrote:
>
> >>> In <mailman.113.1242254593.8015.python-l... at python.org> Terry Reedy <tjre... at udel.edu> writes:
>
> >>>> kj wrote:
>
> >>>>> Suppose I have the following:
>
> >>>>> def foo(x=None, y=None, z=None):
> >>>>> ? ? d = {"x": x, "y": y, "z": z}
> >>>>> ? ? return bar(d)
>
> >>>>> I.e. foo takes a whole bunch of named arguments and ends up calling
> >>>>> a function bar that takes a single dictionary as argument, and this
> >>>>> dictionary has the same keys as in foo's signature, so to speak.
>
> >>>>> Is there some builtin variable that would be the same as the variable
> >>>>> d, and would thus obviate the need to explicitly bind d?
>
> >>>> Use the built-in function locals()
>
> >>>>>>> def f(a,b):
>
> >>>> ? ? ? ?x=locals()
> >>>> ? ? ? ?print(x)
>
> >>>>>>> f(1,2)
>
> >>>> {'a': 1, 'b': 2}
>
> >>> That's *exactly* what I was looking for. ?Thanks!
>
> >>> kynn
>
> >> You already had a better answer from Chris Rebert:
>
> >> def foo(**kwargs):
> >> ? ?return bar(kwargs)
>
> >> kwargs at this point is exactly a dictionary of the named arguments to foo.
>
> > I disagree. ?If I defined foo as you show above, then there is no
> > error checking on the named parameters passed to foo; anything
> > goes.
>
> >> Because if you try to do anything in this function, you'll probably be
> >> adding more local variables. And then they'd be passed to bar as well.
>
> > That problem is easily solved: just make "x = locals()" the first
> > statement in the definition of foo.
>
> > kynn
>
> Well, you caught me by surprise. ?The name and number of locals is
> determined at compile time, not at run time. ?But when I run an
> experiment, it seems you're right, that the dict changes as the function
> executes.

So don't call it again!

> In Python 2.62 at least, the following function gives the following results:
>
> def myfunc(x, y):
> ? ? print ?locals()
> ? ? s = 42
> ? ? print locals()
>
> myfunc(y=12, x=33)
>
> {'y': 12, 'x': 33}
> {'y': 12, 'x': 33, 's': 42, 'r': {'y': 12, 'x': 33}}
> {'y': 12, 'x': 33}
>
> So, if one wanted to call bar, but not till after one had defined new
> locals, you could do the following:
>
> def foo(x=None, y=None, z=None):
> ? ? ?args = locals().copy()
> ? ? ?a = new stuff
> ? ? ?dosomestuff with a, and maybe y
> ? ? ?bar(args)
>
> A shallow copy would be adequate in this case.

As I (thought I had) demonstrated, *NO* copy would be adequate in that
case.

> Thanks for the correction.



From gagsl-py2 at yahoo.com.ar  Thu May 14 22:47:08 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 14 May 2009 23:47:08 -0300
Subject: (Windows) Finding out which process has locked a file.
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
	<guh02f$re4$2@lust.ihug.co.nz>
Message-ID: <op.utx90uajx6zn5v@lepton.softlabbsas.com.ar>

En Thu, 14 May 2009 08:42:07 -0300, Lawrence D'Oliveiro escribi?:
> In message <787d6072-3381-40bd-
> af20-8e1a40405033 at h23g2000vbc.googlegroups.com>, CinnamonDonkey wrote:
>
>> I have a script running which occa[s]ionally fails because it is trying
>> to delete a file in use by another process. When this happens I want
>> it to log which process has the lock.
>
> Maybe there is no such process. Maybe it's just the Dimdows filesystem
> randomly returning a failure on its own. How would you know?

Oh, c'mon, that's just nonsense and doesn't help anybody.

-- 
Gabriel Genellina



From janssen at parc.com  Thu May 14 23:09:52 2009
From: janssen at parc.com (Bill Janssen)
Date: Thu, 14 May 2009 20:09:52 PDT
Subject: UpLib 1.7.6 available
Message-ID: <y1a8wkzm58f.fsf@marlowe.parc.xerox.com>

I've released the latest version of my UpLib personal digital library
system.

For those of you unfamiliar with UpLib, here's the abstract:

  The UpLib personal digital library system provides a secure
  long-term storage system, and a visually-oriented retrieval
  mechanism, for a wide variety of personal documents such as papers,
  photos, receipts, music, Web pages, books, clippings, and email. It
  is suitable for collections comprising tens of thousands of
  documents, and provides for ease of document entry and access as
  well as high levels of security and privacy. It is highly extensible
  through user scripting, and supports collaborative sharing of those
  extensions through a common extensions library.

It's mainly written in Python -- there's a scrap of C code for page
image zone classification, PyLucene is used for indexing and search,
and there's a fairly extensive Java client-side library, including a
document reader.

Among other things, it includes my Python IMAP server, which allows an
UpLib document repository to be used as an IMAP mail server.

http://uplib.parc.com/

Bill


From vavasis at cpu111.math.uwaterloo.ca  Thu May 14 23:24:51 2009
From: vavasis at cpu111.math.uwaterloo.ca (Stephen Vavasis)
Date: Fri, 15 May 2009 03:24:51 +0000 (UTC)
Subject: C API: how to replace python number object in place?
References: <guhk5c$gb2$1@rumours.uwaterloo.ca>
	<JrudnVSRisF_5pHXnZ2dnUVZ_rOdnZ2d@pdx.net>
Message-ID: <guina3$r76$1@rumours.uwaterloo.ca>

In my previous posting, I inquired how to change a python numeric object 
in place.  Several people responded that this is not possible.  Perhaps I 
should explain the larger problem that I am trying to solve, and then the 
solution will become apparent.  I have a C routine R that invokes a Python 
routine S repeatedly.  This Python routine S takes three arguments, two 
floats and an integer.  I have read the documentation explaining how R can 
use the C API to construct an argument list for invoking S.  The issue 
that baffles me is that, as far as I can tell, each time R invokes S 
again, it needs to deallocate and reallocate the three arguments.  It 
would seem be much more efficient if R could create the argument list once 
and then modify the values inside of it for each subsequent invocation of 
S.

-- Steve Vavasis


In article <JrudnVSRisF_5pHXnZ2dnUVZ_rOdnZ2d at pdx.net>,
Scott David Daniels  <Scott.Daniels at Acm.Org> wrote:

>If you do figurte out how to do what you want, you will put us in the
>old FORTRAN trap:  People can write code that changes the value of a
>constant.
>The code:
>     month = 12 # make it december
>     inches_per_foot = 12
>     make_previous(month)
>     print ('Month is now: %s, inches_per_foot = %s' % (
>                month, inches_per_foot))
>might print:
>     Month is now: 11, inches_per_foot = 11
>
>--Scott David Daniels
>Scott.Daniels at Acm.Org




From totobe at gmail.com  Fri May 15 00:13:45 2009
From: totobe at gmail.com (wdveloper)
Date: Thu, 14 May 2009 21:13:45 -0700 (PDT)
Subject: Call Web Service using proxy and http authentication
References: <3ebae673-2579-4589-b57a-2330c5fe9f3c@j12g2000vbl.googlegroups.com>
	<f8e3d564-b19f-4767-b4cb-b7dfcb86ecca@j18g2000prm.googlegroups.com> 
	<ebab040f-f2e4-4387-8da6-d568b865785a@o27g2000vbd.googlegroups.com> 
	<f17ad6fe-866d-4dbc-bca7-2ed8a8d39bee@v35g2000pro.googlegroups.com>
Message-ID: <167c6e81-c8e3-4476-bbe0-5c7eb4fdb819@r3g2000vbp.googlegroups.com>

On May 13, 5:26?pm, Steve Howell <showel... at yahoo.com> wrote:
> On May 12, 12:51?pm, wdveloper <tot... at gmail.com> wrote:
>
>
>
> > On May 12, 8:38?pm, Steve Howell <showel... at yahoo.com> wrote:
>
> > > On May 12, 8:59?am, wdveloper <tot... at gmail.com> wrote:
>
> > > > Hi everyone,
>
> > > > I am trying to call a webservice which requires an http
> > > > authentication.
> > > > To reach the ws, I must pass from a proxy http. So in the whole I need
> > > > go through two authentications before getting the ws working. I am
> > > > using SOAPpy and I'm getting quite crazy.
> > > > I am able to arrange this problem with simple http calls using urllib2
> > > > but for the ws i dont see any way out.
>
> > > > Does anyone knows how I can manage this stuff? Is there any better
> > > > solution or example code?
>
> > > Your high level description of the problem is good, but I think you'll
> > > get more help if you provide a little more detail.
>
> > > For something like this you may want to try to do more at the HTTP
> > > level, where you have a little more control over the authentication,
> > > and then find a way to hook into SOAPpy just to build and parse the
> > > payloads.
>
> > > How good is your understanding of HTTP? ?Do you know the basics of how
> > > headers work? ?You might want to brush up a little on HTTP just to
> > > help understand what's going on; it will almost certainly be valuable
> > > for future projects as well.
>
> > > To understand how the proxy works in particular, if you can use the
> > > proxy to access a normal html-serving website, you can use the "Live
> > > HTTP Headers" tool under Firefox to see what's going on.
>
> > > But before all that, I would maybe just post a little more detail on
> > > the problem. ?Maybe show code you've written so far, and any error
> > > messages/tracebacks, to better indicate where you are stuck.
>
> > Thank you very much Steve,
>
> > I do have a good understanding of http and its headers rules, and of
> > course I can work on that.
> > On the other hand, I am new to python and SOAPpy toolkit and I dont
> > have much of an experience working with ws in general.
>
> > When it comes of working with simple call to WS, everything is
> > successfull; problems start cause I dont know how to use the toolkit
> > to compose the http request. I should code it in the way that it
> > connects to my proper proxy and it gets authenticated in the server
> > exposing the service.
>
> > What I have is something like:
> > from SOAPpy import WSDL
>
> > wsdl = 'http://myws?wsdl'
> > my_http_proxy = '10.x.x.x:8080'
> > proxy = WSDL.Proxy(wsdl, http_proxy=my_http_proxy)
> > res = proxy.myService( myparam='...' )
>
> > What I get is that connection reaches timeout since the server doesnt
> > see me coming from the right proxy.
> > First problem, I can't see where I can put my proxy authentication
> > username and password.
> > Second, when I will be able to pass through the right proxy, I need to
> > authenticate on the server via http through my credential.
>
> Have you looked at the URLopener class?

At the end what I did is to use the authentication components offered
by urllib2.
Just I had to hand write the SOAP message outcoming, losing the chance
to use SOAPpy.
Anyway it seems to work this way,
thanks again


From pavlovevidence at gmail.com  Fri May 15 00:14:45 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 14 May 2009 21:14:45 -0700 (PDT)
Subject: C API: how to replace python number object in place?
References: <guhk5c$gb2$1@rumours.uwaterloo.ca>
	<JrudnVSRisF_5pHXnZ2dnUVZ_rOdnZ2d@pdx.net> 
	<guina3$r76$1@rumours.uwaterloo.ca>
Message-ID: <87f29853-47ee-4021-aaa1-dc7cd8a6cca2@o14g2000vbo.googlegroups.com>

On May 14, 8:24?pm, vava... at cpu111.math.uwaterloo.ca (Stephen Vavasis)
wrote:
> In my previous posting, I inquired how to change a python numeric object
> in place. ?Several people responded that this is not possible. ?Perhaps I
> should explain the larger problem that I am trying to solve, and then the
> solution will become apparent. ?I have a C routine R that invokes a Python
> routine S repeatedly. ?This Python routine S takes three arguments, two
> floats and an integer. ?I have read the documentation explaining how R can
> use the C API to construct an argument list for invoking S. ?The issue
> that baffles me is that, as far as I can tell, each time R invokes S
> again, it needs to deallocate and reallocate the three arguments.

That's correct.

(Well, not exactly: sometimes PyInt_New can use a pre-existing object
rather than to allocate a new one.  Also ints and floats I think both
use arena allocation, meaning that Python gets big chunks and creates
objects out of that.  It's not like malloc gets called for every
PyInt_New invokation.  But those are implementation details.  Just
trust that Python's been pretty well optimized by now to create new
int and float objects.)


> It
> would seem be much more efficient if R could create the argument list once
> and then modify the values inside of it for each subsequent invocation of
> S.

It really won't make that much of a difference.  Python is creating
and destroying objects all the time.  If you were to execute a line
like this in Python:

a = b + 2.0 / (0.5 * m * v * v)

It'd probably create and delete 5 intermediate number objects.
Whatever small gains you could make by eliminating a few object
allocations in your calling code would hardly be noticeable.


Carl Banks


From __peter__ at web.de  Fri May 15 02:01:48 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 15 May 2009 08:01:48 +0200
Subject: putting date strings in order
References: <dc7e9d9c-5957-45ab-9228-70dafbe46e7a@n4g2000vba.googlegroups.com>
	<guhn01$j0r$03$1@news.t-online.com>
	<UImdnbqCOMOL55HXnZ2dnUVZ_gCdnZ2d@pdx.net>
	<b1a0f614-fae0-4b5b-8c14-5b4cf8a6dc73@t11g2000vbc.googlegroups.com>
Message-ID: <guj0g3$jfv$01$1@news.t-online.com>

noydb wrote:

> On May 14, 4:13 pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
>> Peter Otten wrote:
>> > Hm, if ordered_raster_list is guaranteed to contain one string item for
>> > every month the above can be simplified to
>>
>> > months = [
>> > 'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr',
>> > 'precip_may', 'precip_jun', 'precip_jul', 'precip_aug',
>> > 'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec']
>>
>> > start = 2
>> > ordered_raster_list = months[start-1:] + months[:start-1]
>>
>> Or even:
>> >
>> multi_months = [
>> 'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr',
>> 'precip_may', 'precip_jun', 'precip_jul', 'precip_aug',
>> 'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec'] * 2
>> start = 2
>> ordered_raster_list = multi_months[start - 1: start + 11]
>>
>> --Scott David Daniels
>> Scott.Dani... at Acm.Org
> 
> Peter and Scott --
> 
> ordered_raster_list is guaranteed to have one string item for all 12
> months -- it is just NOT guaranteed to have those in chronological
> order, which is what is required, whether the data starts in january
> (thus ending in dec of same year) or august (thus ending in jul of the
> following year) or whenever.  The initial order of the list is
> dictated by when the raster (precip_<month>) was added to it's
> container.  One would hope the rasters would be added in order, but I
> cannot count on that and shouldn't.

Then you can indeed build the list directly instead of reading it out of 
ListRasters(...) and then sorting it. 

You will get wrong results when there are missing or duplicate months anyway 
unless you work the start month into the lookup dictionary

ordered_months = months[start-1:] + months[:start-1]
month_dict = dict(zip(ordered_months, range(12)))
ordered_raster_list.sort(key=month_dict.get)

or use the modulo key.

Peter



From bijoy.franco at gmail.com  Fri May 15 02:07:08 2009
From: bijoy.franco at gmail.com (bijoy franco)
Date: Fri, 15 May 2009 11:37:08 +0530
Subject: creating python code with dynamic file name
Message-ID: <358348b30905142307h4d7fc1b8wca820ab8a75fcc04@mail.gmail.com>

hi,


How can i create python code, for which filename can be defined on the
fly..?

for example, in a blog, when each article selected, respective python code
with headline of the article as filename should be called.

thanks

bijoy
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From wuwei23 at gmail.com  Fri May 15 03:03:07 2009
From: wuwei23 at gmail.com (alex23)
Date: Fri, 15 May 2009 00:03:07 -0700 (PDT)
Subject: x.abc vs x['abc']
References: <mailman.98.1242244463.8015.python-list@python.org>
Message-ID: <40de0cfb-b4e7-4d37-87e9-382c0dbdac62@d38g2000prn.googlegroups.com>

On May 14, 5:49?am, Gunter Henriksen <gunterhenrik... at gmail.com>
wrote:
> Presuming it is very common to have objects created
> on the fly using some sort of external data
> definitions, is there an obvious common standard
> way to take a dict object and create an object
> whose attribute names are the keys from the dict?

I've always liked this approach, which I first saw in a post by Alex
Martelli:

>>> class Bunch(object):
...     def __init__(self, **kwargs):
...         self.__dict__.update(kwargs)
...
>>> b = Bunch(a=1,b=2,c=3)
>>> b.a
1
>>> b.b
2
>>> b.d = 22
>>> b.d
22


Elegant.


From descentspb at gmail.com  Fri May 15 03:04:43 2009
From: descentspb at gmail.com (Igor Katson)
Date: Fri, 15 May 2009 11:04:43 +0400
Subject: KeyboardInterrupt catch does not shut down the socketserver
Message-ID: <4A0D140B.9040503@gmail.com>

I have problems in getting a SocketServer to shutdown. Why does this not 
actually stop the application?

from SocketServer import UnixStreamServer, BaseRequestHandler

server = UnixStreamServer('/tmp/ss.sock', BaseRequestHandler)
try:
    server.serve_forever()
except KeyboardInterrupt:
    server.shutdown()


After that the server does not respond any more, but the application hangs.

What's the proper way to shutdown the socketserver and what is my mistake?


From er.srivastavarohit at gmail.com  Fri May 15 03:05:19 2009
From: er.srivastavarohit at gmail.com (Rohit Srivastava)
Date: Fri, 15 May 2009 00:05:19 -0700 (PDT)
Subject: File System Redirection Windows x 64 box.
Message-ID: <4c805dd8-f614-4d5d-aff2-940e7da45c17@g19g2000vbi.googlegroups.com>

Hi,

In Windows 2003 x64, I want to call iscsicli.exe which is there only
in system32 directory.
Now since in x64 system windows actually redirect the 32 bit
application to sysWOW64 directory, if it is looking for system32. For
more information look for
<http://msdn.microsoft.com/en-us/library/aa384187(VS.85).aspx >

Now my application is being redirected to this directory and from
python I am always getting an error saying, The program can not find
the file specified.

Any idea, how  can I overcome this, using python? (Condition :: I must
complie for 32 bit system only)
Thanks in Advance

Regards
Rohit


From CinnamonDonkey at googlemail.com  Fri May 15 03:05:46 2009
From: CinnamonDonkey at googlemail.com (CinnamonDonkey)
Date: Fri, 15 May 2009 00:05:46 -0700 (PDT)
Subject: (Windows) Finding out which process has locked a file.
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
	<guh02f$re4$2@lust.ihug.co.nz>
	<mailman.180.1242355642.8015.python-list@python.org>
Message-ID: <4191d437-ba03-408b-951f-ca7ec4b49bd7@o30g2000vbc.googlegroups.com>

I have to say, this has got to be one of the least helpful groups I am
subscribed to.

Some interesting links...

   http://support.microsoft.com/kb/218965

   http://timgolden.me.uk/python/win32_how_do_i/add-security-to-a-file.html#the-short-version

   http://timgolden.me.uk/python/win32_how_do_i/get-the-owner-of-a-file.html




On 15 May, 03:47, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Thu, 14 May 2009 08:42:07 -0300, Lawrence D'Oliveiro escribi?:
>
> > In message <787d6072-3381-40bd-
> > af20-8e1a40405... at h23g2000vbc.googlegroups.com>, CinnamonDonkey wrote:
>
> >> I have a script running which occa[s]ionally fails because it is trying
> >> to delete a file in use by another process. When this happens I want
> >> it to log which process has the lock.
>
> > Maybe there is no such process. Maybe it's just the Dimdows filesystem
> > randomly returning a failure on its own. How would you know?
>
> Oh, c'mon, that's just nonsense and doesn't help anybody.
>
> --
> Gabriel Genellina



From mail at timgolden.me.uk  Fri May 15 03:50:37 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 15 May 2009 08:50:37 +0100
Subject: (Windows) Finding out which process has locked a file.
In-Reply-To: <4191d437-ba03-408b-951f-ca7ec4b49bd7@o30g2000vbc.googlegroups.com>
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>	<guh02f$re4$2@lust.ihug.co.nz>	<mailman.180.1242355642.8015.python-list@python.org>
	<4191d437-ba03-408b-951f-ca7ec4b49bd7@o30g2000vbc.googlegroups.com>
Message-ID: <4A0D1ECD.2020400@timgolden.me.uk>

CinnamonDonkey wrote:
 > I have to say, this has got to be one of the
 > least helpful groups I am subscribed to.

I'm genuinely surprised to hear you say that, especially
about this thread to which you (who appear to be the OP)
have received several replies all pointing you towards
the sysinternals tools which are pretty much the de facto
standard for doing things of this type. They're not
API calls but they're a reasonable compromise between
doing some simple parsing of output and dealing with
some underdocumented and messy low-level NT APIs.

Granted there was one rather silly response but they
really are few and far between on this list I think.
(Or perhaps I just filter them out...)

> Some interesting links...
> 
>    http://support.microsoft.com/kb/218965
> 
>    http://timgolden.me.uk/python/win32_how_do_i/add-security-to-a-file.html#the-short-version
> 
>    http://timgolden.me.uk/python/win32_how_do_i/get-the-owner-of-a-file.html

Unforunately, you're perhaps adding to the not-helpfulness here
since none of those links (and I'm the author of two of them)
address the question. The original request doesn't want to
know what security is preventing you from accessing the file: it
wants to know who has a *lock* on the file, and as I pointed
out earlier, this is only accessible by some low-level API calls.

If I and others have misunderstood the original question, then
please come back and say so, but your original request seems
fairly clearly to point towards file locking and not to
security & ownership.


TJG


From anuraguniyal at yahoo.com  Fri May 15 04:13:15 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 15 May 2009 01:13:15 -0700 (PDT)
Subject: How to catch str exception?
Message-ID: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>


import sys
try:
    raise "xxx"
except str,e:
    print "1",e # is not caught here
except:# is caught here
    print "2",sys.exc_type,sys.exc_value

In the above code a string exception is raised which though deprecated
but still a 3rd party library I use uses it. So how can I catch such
exception without relying on catch all, which could be bad.

system: Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52) [GCC 4.2.3
(Ubuntu 4.2.3-2ubuntu7)] on linux2


From ldo at geek-central.gen.new_zealand  Fri May 15 04:17:03 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 15 May 2009 20:17:03 +1200
Subject: KeyboardInterrupt catch does not shut down the socketserver
References: <mailman.183.1242371089.8015.python-list@python.org>
Message-ID: <guj8dv$5sl$2@lust.ihug.co.nz>

In message <mailman.183.1242371089.8015.python-list at python.org>, Igor Katson 
wrote:

> I have problems in getting a SocketServer to shutdown.

Do you want to do a shutdown or a close?



From descentspb at gmail.com  Fri May 15 04:25:52 2009
From: descentspb at gmail.com (Igor Katson)
Date: Fri, 15 May 2009 12:25:52 +0400
Subject: KeyboardInterrupt catch does not shut down the socketserver
In-Reply-To: <guj8dv$5sl$2@lust.ihug.co.nz>
References: <mailman.183.1242371089.8015.python-list@python.org>
	<guj8dv$5sl$2@lust.ihug.co.nz>
Message-ID: <4A0D2710.2030402@gmail.com>

Lawrence D'Oliveiro wrote:
> In message <mailman.183.1242371089.8015.python-list at python.org>, Igor Katson 
> wrote:
>
>   
>> I have problems in getting a SocketServer to shutdown.
>>     
>
> Do you want to do a shutdown or a close?
>
>   
I want the server close the socket, and the program to continue after 
that (in this case, just to terminate).


From er.srivastavarohit at gmail.com  Fri May 15 04:26:09 2009
From: er.srivastavarohit at gmail.com (Rohit Srivastava)
Date: Fri, 15 May 2009 01:26:09 -0700 (PDT)
Subject: File System Redirection Windows x 64 box.
References: <4c805dd8-f614-4d5d-aff2-940e7da45c17@g19g2000vbi.googlegroups.com>
Message-ID: <896e09e8-8efb-40c7-bb74-3f5e6f27ae69@x6g2000vbg.googlegroups.com>

On May 15, 12:05?pm, Rohit Srivastava <er.srivastavaro... at gmail.com>
wrote:
> Hi,
>
> In Windows 2003 x64, I want to call iscsicli.exe which is there only
> in system32 directory.
> Now since in x64 system windows actually redirect the 32 bit
> application to sysWOW64 directory, if it is looking for system32. For
> more information look for
> <http://msdn.microsoft.com/en-us/library/aa384187(VS.85).aspx>
>
> Now my application is being redirected to this directory and from
> python I am always getting an error saying, The program can not find
> the file specified.
>
> Any idea, how ?can I overcome this, using python? (Condition :: I must
> complie for 32 bit system only)
> Thanks in Advance
>
> Regards
> Rohit

Apologies for the last statement in the previous post.
Please read it as (I need to comply with 32 bit Windows system also).

Regards
Rohit


From giuott at gmail.com  Fri May 15 04:29:41 2009
From: giuott at gmail.com (Giuseppe Ottaviano)
Date: Fri, 15 May 2009 10:29:41 +0200
Subject: [ANN] BPT (Boxed Package Tool) 0.4a -- now with PIP support
Message-ID: <D22BF965-3677-46E1-A1F9-10055BCB8E1C@gmail.com>

Hi all,
I am happy to announce BPT 0.4a

http://pypi.python.org/pypi/bpt

This release is particularly interesting for python users, since it  
includes a modified version of PIP that installs the packages inside  
the box. So, at least for python packages, installation (including  
dependency resolution) is fully automated.

Version 0.4
===========

- Included a forked version of `PIP
<http://pypi.python.org/pypi/pip>`_ 0.3.1 that installs packages in
the current box. Installing python packages is now as easy as
``easy_install``

- Implemented the ``autoremove`` command that removes all the disabled
packages (unless they match given patterns)

- Written some new documentation, added a TODO list

What is BPT
===========

BPT is a Python library (``bpt``) and a command line application
(``box``) to create and manage isolated enviroments, or *boxes*.

- Boxes are *relocatable*, which means that they can be moved to a
different directory or even distributed to other machines (provided
that the architecture is compatible).

- Packages inside the box can be easily disabled, enabled and removed,
so that different versions of the same software can be installed
simultaneously, allowing to switch between them.

- Boxes can be *nested*, in the sense that it is possible to activate
a box environment while inside another box environment, so that all
the packages installed in both boxes are available, and so on.

BPT is similar in some ways to `virtualenv
<http://pypi.python.org/pypi/virtualenv>`_, but it is not restricted
to Python packages, allowing to install virtually any Unix
software. It also takes some ideas from `jhbuild
<http://live.gnome.org/Jhbuild>`_, but without the dependency
resolution and automatic downloading machinery, and the ``bpt-rules``
format is inspired by `Gentoo <http://www.gentoo.org/>`_'s ebuilds.

A fork of PIP_ is included to make installation of python packages
easier, and as an example of use of the BPT API.


Enjoy,
Giuseppe Ottaviano


From kurt at kbsymanzik.org  Fri May 15 04:45:10 2009
From: kurt at kbsymanzik.org (Kurt Symanzik)
Date: Fri, 15 May 2009 16:45:10 +0800
Subject: How to catch str exception?
In-Reply-To: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
Message-ID: <4A0D2B96.1090605@kbsymanzik.org>

"anuraguniyal at yahoo.com" <anuraguniyal at yahoo.com> wrote on 2009-05-15 
4:13:15 PM +0800
> import sys
> try:
>     raise "xxx"
> except str,e:
>     print "1",e # is not caught here
> except:# is caught here
>     print "2",sys.exc_type,sys.exc_value
> 
> In the above code a string exception is raised which though deprecated
> but still a 3rd party library I use uses it. So how can I catch such
> exception without relying on catch all, which could be bad.
> 
> system: Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52) [GCC 4.2.3
> (Ubuntu 4.2.3-2ubuntu7)] on linux2

Try this, i.e. catch the exact string:

except "xxx":


Kurt

-- 
Kurt Symanzik
kurt at kbsymanzik.org
Skype id: ksymanzik
http://kbsymanzik.org


From bruno.42.desthuilliers at websiteburo.invalid  Fri May 15 04:55:48 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 15 May 2009 10:55:48 +0200
Subject: introspection question: get return type
In-Reply-To: <guhsvv$cu$1@panix3.panix.com>
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<4a0c1a0e$0$31748$426a74cc@news.free.fr>
	<%bXOl.15204$Ux.561@tornado.fastwebnet.it>
	<4a0c6e42$0$12031$426a74cc@news.free.fr>
	<guhsvv$cu$1@panix3.panix.com>
Message-ID: <4a0d2e07$0$9422$426a74cc@news.free.fr>

Aahz a ?crit :
> In article <4a0c6e42$0$12031$426a74cc at news.free.fr>,
> Bruno Desthuilliers  <bdesth.quelquechose at free.quelquepart.fr> wrote:
>> Marco Mariani a ?crit :
>>> Bruno Desthuilliers wrote:
>>>> Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
>>>> sense given Python's dynamic typing.
>>> Unless he's really trying to write in Nohtyp,
>> You meant "Notype" ?-)
> 
> Marco's spelling is correct.  Try "Nohtyp".reverse()

Aazh... I know I'm a bit dumb sometimes, but do you *really* think I had 
failed to spot this ???



From svarovsky.tomas at gmail.com  Fri May 15 04:57:58 2009
From: svarovsky.tomas at gmail.com (Tomas Svarovsky)
Date: Fri, 15 May 2009 01:57:58 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com> 
	<gugpup$1r7$1@south.jnrs.ja.net>
	<747b0d4f-f9fd-4fa6-bb6d-0a4365f328ba@b1g2000vbc.googlegroups.com>
	<guhh5c$8dc$1@south.jnrs.ja.net>
Message-ID: <342d6153-cb70-4efe-9057-f2d86f78db26@z19g2000vbz.googlegroups.com>

On May 14, 6:33?pm, "Richard Brodie" <R.Bro... at rl.ac.uk> wrote:
> "Tomas Svarovsky" <svarovsky.to... at gmail.com> wrote in message
>
> news:747b0d4f-f9fd-4fa6-bb6d-0a4365f328ba at b1g2000vbc.googlegroups.com...
>
> > This is a good point, but then it would manifest regardless of the
> > language used AFAIK. And this is not the case, ruby and php
> > implementations are working quite fine.
>
> What I meant was: not reading the data and leaving the connection
> open is going to force the server to handle all 100 requests concurrently.
> I'm guessing that's not what your other implementations do.
> What happens to the timing if you call response.read(), response.close() ?

Now I get it, but nevertheless, even when I explicitely read from the
socket and then close it properly, the timing still doesn't change.

Thanks for advice though


From anuraguniyal at yahoo.com  Fri May 15 05:15:14 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 15 May 2009 02:15:14 -0700 (PDT)
Subject: How to catch str exception?
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.187.1242377429.8015.python-list@python.org>
Message-ID: <86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>

but the whole point of catching such exception is that i can print its
value
there are many such exceptions and hence it is not feasible to catch
them all or know them all unless i go thru src code.



From zainescu at gmail.com  Fri May 15 05:23:31 2009
From: zainescu at gmail.com (Zainescu Traian)
Date: Fri, 15 May 2009 12:23:31 +0300
Subject: test 23213213
Message-ID: <twaPl.19768$ho7.18257@newsfe10.iad>

test test


From CinnamonDonkey at googlemail.com  Fri May 15 05:24:58 2009
From: CinnamonDonkey at googlemail.com (CinnamonDonkey)
Date: Fri, 15 May 2009 02:24:58 -0700 (PDT)
Subject: (Windows) Finding out which process has locked a file.
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
	<guh02f$re4$2@lust.ihug.co.nz>
	<mailman.180.1242355642.8015.python-list@python.org> 
	<4191d437-ba03-408b-951f-ca7ec4b49bd7@o30g2000vbc.googlegroups.com> 
	<mailman.184.1242373818.8015.python-list@python.org>
Message-ID: <0a981c1d-871b-4917-8fd3-03493d6dbed3@o30g2000vbc.googlegroups.com>

Thanx for the response Tim! :-) Great site!

 > I'm genuinely surprised to hear you say that...

Early morning frustration... I appologise to all... you are totally
right. Thank you to all for the responses.

The sysinternal "Handle" tool that you made reference to earlier is
definately a working solution with minimal effort and I could indeed
use this to solve the problem.

I'd very much like to understand how such a problem could be solved
programatically though even if it means using some "underdocumented
and messy low-level NT APIs". Whilst taking the simplest approach is
the quickest to an end solution... it's also the least educational.
I'm as interested in how file locking works as I am in solving the
problem.

 > "you're perhaps adding to the not-helpfulness here..."

Again, a valid point and a lesson to be learned... I should actually
read the links I post before posting them! (I actually posted them so
that I could later read them at work).

Yes, this thread is specifically about who has the *lock* on a file.

Thanx TJG for the reality check ;-)

Shaun



On 15 May, 08:50, Tim Golden <m... at timgolden.me.uk> wrote:
> CinnamonDonkey wrote:
>
> ?> I have to say, this has got to be one of the
> ?> least helpful groups I am subscribed to.
>
> I'm genuinely surprised to hear you say that, especially
> about this thread to which you (who appear to be the OP)
> have received several replies all pointing you towards
> the sysinternals tools which are pretty much the de facto
> standard for doing things of this type. They're not
> API calls but they're a reasonable compromise between
> doing some simple parsing of output and dealing with
> some underdocumented and messy low-level NT APIs.
>
> Granted there was one rather silly response but they
> really are few and far between on this list I think.
> (Or perhaps I just filter them out...)
>
> > Some interesting links...
>
> > ? ?http://support.microsoft.com/kb/218965
>
> > ? ?http://timgolden.me.uk/python/win32_how_do_i/add-security-to-a-file.h...
>
> > ? ?http://timgolden.me.uk/python/win32_how_do_i/get-the-owner-of-a-file....
>
> Unforunately, you're perhaps adding to the not-helpfulness here
> since none of those links (and I'm the author of two of them)
> address the question. The original request doesn't want to
> know what security is preventing you from accessing the file: it
> wants to know who has a *lock* on the file, and as I pointed
> out earlier, this is only accessible by some low-level API calls.
>
> If I and others have misunderstood the original question, then
> please come back and say so, but your original request seems
> fairly clearly to point towards file locking and not to
> security & ownership.
>
> TJG



From __peter__ at web.de  Fri May 15 05:46:57 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 15 May 2009 11:46:57 +0200
Subject: How to catch str exception?
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
Message-ID: <gujdm7$cip$01$1@news.t-online.com>

anuraguniyal at yahoo.com wrote:

> but the whole point of catching such exception is that i can print its
> value
> there are many such exceptions and hence it is not feasible to catch
> them all or know them all unless i go thru src code.

Catch them all with a bare except and then reraise non-string exceptions:

try:
    raise "abc"
except:
    e, t, tb = sys.exc_info()
    if not isinstance(e, str):
        raise
    print "caught", e





From anuraguniyal at yahoo.com  Fri May 15 07:50:59 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 15 May 2009 04:50:59 -0700 (PDT)
Subject: How to catch str exception?
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
	<gujdm7$cip$01$1@news.t-online.com>
Message-ID: <62c75d3a-fe31-4b91-b493-58f2d53c105a@k19g2000prh.googlegroups.com>


> try:
> ? ? raise "abc"
> except:
> ? ? e, t, tb = sys.exc_info()
> ? ? if not isinstance(e, str):
> ? ? ? ? raise
> ? ? print "caught", e

This seems to be the solution, thanks


From ldo at geek-central.gen.new_zealand  Fri May 15 07:53:37 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 15 May 2009 23:53:37 +1200
Subject: KeyboardInterrupt catch does not shut down the socketserver
References: <mailman.183.1242371089.8015.python-list@python.org>
	<guj8dv$5sl$2@lust.ihug.co.nz>
	<mailman.185.1242375959.8015.python-list@python.org>
Message-ID: <gujl41$d0r$2@lust.ihug.co.nz>

In message <mailman.185.1242375959.8015.python-list at python.org>, Igor Katson 
wrote:

> Lawrence D'Oliveiro wrote:
>
>> In message <mailman.183.1242371089.8015.python-list at python.org>, Igor
>> Katson wrote:
>>   
>>> I have problems in getting a SocketServer to shutdown.
>>
>> Do you want to do a shutdown or a close?
>>   
> I want the server close the socket ...

You want to do a close, do a close, not a shutdown 
<http://docs.python.org/library/socket.html>.




From gediminas.kregzde at gmail.com  Fri May 15 07:56:08 2009
From: gediminas.kregzde at gmail.com (Gediminas Kregzde)
Date: Fri, 15 May 2009 14:56:08 +0300
Subject: Just wondering
Message-ID: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>

Hello,

I'm Vilnius college II degree student and last semester our teacher
introduced us to python
I've used to program with Delphi, so I very fast adopted to python

Now I'm developing cross platform program and use huge amounts of
data. Program is needed to run as fast as it coud. I've read all tips
about geting performance, but got 1 bug: map function is slower than
for loop for about 5 times, when using huge amounts of data.
It is needed to perform some operations, not to return data.

I'm adding sample code:
from time import time

def doit(i):
   pass

def main():
   a = [0] * 10000000
   t = time()
   map(doit, a)
   print "map time: " + str(time() - t)

def main2():
   t = time()
   a = [0] * 10000000
   for i in a:
       pass
   print "loop time: " + str(time() - t)

main()  # takes approximately 5x times longer than main2()
main2()

I'm wondering were is catch?

I'm using python 2.6 on windows xp sp2 machine

P.S. Sorry for my broken English


From pataphor at gmail.com  Fri May 15 08:03:38 2009
From: pataphor at gmail.com (pataphor)
Date: Fri, 15 May 2009 14:03:38 +0200
Subject: itertools question
In-Reply-To: <mailman.139.1242307225.8015.python-list@python.org>
References: <mailman.139.1242307225.8015.python-list@python.org>
Message-ID: <gujlmr$108$1@news.motzarella.org>

Neal Becker wrote:

> Is there any canned iterator adaptor that will 
> 
> transform:
> in = [1,2,3....]
> 
> into:
> out = [(1,2,3,4), (5,6,7,8),...]
> 
> That is, each time next() is called, a tuple of the next N items is 
> returned.

Here's one that abuses a for loop:

from itertools import islice

def grouper(seq,n):
     it = iter(seq)
     for x in it:
         yield (x,) + tuple(islice(it,n-1))

def test():
     L = range(11)
     n = 3
     for x in grouper(L,n):
         print x

if __name__ == '__main__':
     test()

BTW what's up with the followup to gmane?

P.


From descentspb at gmail.com  Fri May 15 08:04:05 2009
From: descentspb at gmail.com (Igor Katson)
Date: Fri, 15 May 2009 16:04:05 +0400
Subject: KeyboardInterrupt catch does not shut down the socketserver
In-Reply-To: <gujl41$d0r$2@lust.ihug.co.nz>
References: <mailman.183.1242371089.8015.python-list@python.org>	<guj8dv$5sl$2@lust.ihug.co.nz>	<mailman.185.1242375959.8015.python-list@python.org>
	<gujl41$d0r$2@lust.ihug.co.nz>
Message-ID: <4A0D5A35.3010008@gmail.com>

Lawrence D'Oliveiro wrote:
> In message <mailman.185.1242375959.8015.python-list at python.org>, Igor Katson 
> wrote:
>
>   
>> Lawrence D'Oliveiro wrote:
>>
>>     
>>> In message <mailman.183.1242371089.8015.python-list at python.org>, Igor
>>> Katson wrote:
>>>   
>>>       
>>>> I have problems in getting a SocketServer to shutdown.
>>>>         
>>> Do you want to do a shutdown or a close?
>>>   
>>>       
>> I want the server close the socket ...
>>     
>
> You want to do a close, do a close, not a shutdown 
> <http://docs.python.org/library/socket.html>.
>
>
>   
Shutdown implies closing the listening socket, doesn't it?


From bearophileHUGS at lycos.com  Fri May 15 08:06:58 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 15 May 2009 05:06:58 -0700 (PDT)
Subject: Just wondering
References: <mailman.188.1242388571.8015.python-list@python.org>
Message-ID: <ad7b76d0-db80-4eaf-9529-689b23fc8279@j12g2000vbl.googlegroups.com>

Gediminas Kregzde:
> map function is slower than
> for loop for about 5 times, when using huge amounts of data.
> It is needed to perform some operations, not to return data.

Then you are using map() for the wrong purpose. map() purpose is to
build a list of things. Use a for loop.

Bye,
bearophile


From marco at sferacarta.com  Fri May 15 08:21:03 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Fri, 15 May 2009 14:21:03 +0200
Subject: Just wondering
In-Reply-To: <mailman.188.1242388571.8015.python-list@python.org>
References: <mailman.188.1242388571.8015.python-list@python.org>
Message-ID: <Q6dPl.15964$Ux.11735@tornado.fastwebnet.it>

Gediminas Kregzde wrote:


> def doit(i):
>    pass
> 
> def main():
>    a = [0] * 10000000
>    t = time()
>    map(doit, a)
>    print "map time: " + str(time() - t)

Here you are calling a function ten million times, build a list with of 
ten million None results, then throw it away.


> def main2():
>    t = time()
>    a = [0] * 10000000
>    for i in a:
>        pass
>    print "loop time: " + str(time() - t)

Here you do nothing but iterating 'i' over the 'a' list.


> main()  # takes approximately 5x times longer than main2()
> main2()
> 
> I'm wondering were is catch?

Function calls are not free in python. They cost a lot more than they do 
in C, Delphi or other languages.



From stef.mientki at gmail.com  Fri May 15 08:21:27 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Fri, 15 May 2009 14:21:27 +0200
Subject: Just wondering
In-Reply-To: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>
References: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>
Message-ID: <4A0D5E47.6020608@gmail.com>

and this, while it's realy doing something is even 4 times faster than 
main2 ;-)
And if you only need integers, it can be even faster.

def main3():
   from numpy import zeros
   t = time()
   a = zeros ( 10000000 )
   b = a + 3.14
   print "loop time: " + str(time() - t)

cheers,
Stef

Gediminas Kregzde wrote:
> Hello,
>
> I'm Vilnius college II degree student and last semester our teacher
> introduced us to python
> I've used to program with Delphi, so I very fast adopted to python
>
> Now I'm developing cross platform program and use huge amounts of
> data. Program is needed to run as fast as it coud. I've read all tips
> about geting performance, but got 1 bug: map function is slower than
> for loop for about 5 times, when using huge amounts of data.
> It is needed to perform some operations, not to return data.
>
> I'm adding sample code:
> from time import time
>
> def doit(i):
>    pass
>
> def main():
>    a = [0] * 10000000
>    t = time()
>    map(doit, a)
>    print "map time: " + str(time() - t)
>
> def main2():
>    t = time()
>    a = [0] * 10000000
>    for i in a:
>        pass
>    print "loop time: " + str(time() - t)
>
> main()  # takes approximately 5x times longer than main2()
> main2()
>
> I'm wondering were is catch?
>
> I'm using python 2.6 on windows xp sp2 machine
>
> P.S. Sorry for my broken English
>   



From ccurvey at gmail.com  Fri May 15 08:24:03 2009
From: ccurvey at gmail.com (Chris Curvey)
Date: Fri, 15 May 2009 05:24:03 -0700 (PDT)
Subject: capture stdout and stderror from within a Windows Service?
References: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
Message-ID: <1c849439-f572-49c9-b392-3c3e54e5595d@e20g2000vbc.googlegroups.com>

On May 14, 11:57?am, Chris Curvey <ccur... at gmail.com> wrote:
> I'm trying to get this invocation right, and it is escaping me. ?How
> can I capture the stdout and stderr if I launch a subprocess using subprocess.check_call()? ?The twist here is that the call is running
> from within a Windows service.
>
> I've tried:
>
> check_call("mycmd.exe", stdout=subprocess.PIPE) ?[raises an exception
> "An integer is required"]
>
> check_call("mycmd.exe", stdout=file("c:\\temp\\foobar.txt", "w"))
> [raises an exception "An integer is required"]

Ahhh, Blake put me on the right track.  If you want any of the
streams, you have to supply values for all of them, like so:

p = subprocess.Popen(step, shell=True
      stdout=subprocess.PIPE,
      stdin=subprocess.PIPE,
      stderr=subprocess.PIPE)

(stdout, stderr) = p.communicate()

and, incidentally, it appears that you have to use UNC paths in your
Popen call -- drive letters won't work.

so "dir \\foobar\myshare\mydir" will work, but "dir j:\mydir" will
not.

Many thanks for all your assistance.




From __peter__ at web.de  Fri May 15 08:24:07 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 15 May 2009 14:24:07 +0200
Subject: Just wondering
References: <mailman.188.1242388571.8015.python-list@python.org>
Message-ID: <gujmst$fq2$00$1@news.t-online.com>

Gediminas Kregzde wrote:

> Now I'm developing cross platform program and use huge amounts of
> data. Program is needed to run as fast as it coud. I've read all tips
> about geting performance, but got 1 bug: map function is slower than
> for loop for about 5 times, when using huge amounts of data.
> It is needed to perform some operations, not to return data.
> 
> I'm adding sample code:
> from time import time
> 
> def doit(i):
>    pass
> 
> def main():
>    a = [0] * 10000000
>    t = time()
>    map(doit, a)
>    print "map time: " + str(time() - t)
> 
> def main2():
>    t = time()
>    a = [0] * 10000000
>    for i in a:
>        pass
>    print "loop time: " + str(time() - t)
> 
> main()  # takes approximately 5x times longer than main2()
> main2()
> 
> I'm wondering were is catch?
> 
> I'm using python 2.6 on windows xp sp2 machine

Two factors: 

(1) building another throwaway list and
(2) function call overhead for calling doit()

You can avoid (1) by using filter() instead of map() and verify (2) by 
changing the loop to

for i in a:
    doit(i)

Peter



From jaime.frio at gmail.com  Fri May 15 08:27:25 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Fri, 15 May 2009 14:27:25 +0200
Subject: Just wondering
In-Reply-To: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>
References: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>
Message-ID: <97a8f1a70905150527l2b69ab3fq10a8cdcdab7fb865@mail.gmail.com>

map is creating a new list of 10,000,000 items, not modifying the
values inside list a. That's probably where your time difference comes
from...

Jaime

On Fri, May 15, 2009 at 1:56 PM, Gediminas Kregzde
<gediminas.kregzde at gmail.com> wrote:
> Hello,
>
> I'm Vilnius college II degree student and last semester our teacher
> introduced us to python
> I've used to program with Delphi, so I very fast adopted to python
>
> Now I'm developing cross platform program and use huge amounts of
> data. Program is needed to run as fast as it coud. I've read all tips
> about geting performance, but got 1 bug: map function is slower than
> for loop for about 5 times, when using huge amounts of data.
> It is needed to perform some operations, not to return data.
>
> I'm adding sample code:
> from time import time
>
> def doit(i):
> ? pass
>
> def main():
> ? a = [0] * 10000000
> ? t = time()
> ? map(doit, a)
> ? print "map time: " + str(time() - t)
>
> def main2():
> ? t = time()
> ? a = [0] * 10000000
> ? for i in a:
> ? ? ? pass
> ? print "loop time: " + str(time() - t)
>
> main() ?# takes approximately 5x times longer than main2()
> main2()
>
> I'm wondering were is catch?
>
> I'm using python 2.6 on windows xp sp2 machine
>
> P.S. Sorry for my broken English
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From andzy+comp.pyuser at imap-mail.com  Fri May 15 08:28:49 2009
From: andzy+comp.pyuser at imap-mail.com (Andrew Malcolmson)
Date: Fri, 15 May 2009 08:28:49 -0400
Subject: Configure options for minimal Python 2.6
Message-ID: <1242390529.7885.1315620323@webmail.messagingengine.com>

I want to compile a minimal Python 2.6 for Debian Etch without support
for optional features such as tk and sphinx.  The configure script's
help says that features can be disabled with an '--without-PACKAGE', so
I guess disabling tk is '--without-tk', but where is there a list of the
feature/package names of the other optional components?
-------------------
Andrew Malcolmson



From davea at ieee.org  Fri May 15 08:33:32 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 08:33:32 -0400
Subject: creating python code with dynamic file name
In-Reply-To: <358348b30905142307h4d7fc1b8wca820ab8a75fcc04@mail.gmail.com>
References: <358348b30905142307h4d7fc1b8wca820ab8a75fcc04@mail.gmail.com>
Message-ID: <4A0D611C.7010109@ieee.org>

bijoy franco wrote:
> hi,
>
>
> How can i create python code, for which filename can be defined on the
> fly..?
>
> for example, in a blog, when each article selected, respective python code
> with headline of the article as filename should be called.
>
> thanks
>
> bijoy
>
>   
You could have been much clearer in your requirements.  I have to guess:

Perhaps you're writing a CGI script to run on Linux, with Python 2.3.  
You need to be able to import a different python file, depending on some 
data calculation.  You have three different such python files, whose 
names are known ahead of time.
     if   data == "English":
          import   english
     elif   data == "Spanish":
          import  spanish
     else:
          import nativeamerican

Or is it:
You're writing a script on Windows Server 2003, that's going to generate 
python 3.0 source code, and html, and the code and the html it generates 
is dependent on some data retrieved from Yahoo stock quotes.  The python 
all has to be version 3.1


Supply your environment, your requirements, some example data, and some 
test code that doesn't quite work.  Then someone will probably be able 
to point out the problem.


I could suggest you play with __import__()   But of course that's not 
available everywhere.




From jaime.frio at gmail.com  Fri May 15 08:36:39 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Fri, 15 May 2009 14:36:39 +0200
Subject: Just wondering
In-Reply-To: <gujmst$fq2$00$1@news.t-online.com>
References: <mailman.188.1242388571.8015.python-list@python.org>
	<gujmst$fq2$00$1@news.t-online.com>
Message-ID: <97a8f1a70905150536p38111f10ra19b2d4ac579d7fb@mail.gmail.com>

> (1) building another throwaway list and
> (2) function call overhead for calling doit()
>
> You can avoid (1) by using filter() instead of map()

Are you sure of this? My python returns, when asked for help(filter) :

Help on built-in function filter in module __builtin__:

filter(...)
    filter(function or None, sequence) -> list, tuple, or string

    Return those items of sequence for which function(item) is true.  If
    function is None, return the items that are true.  If sequence is a tuple
    or string, return the same type, else return a list.

I'm afraid there is no builtin function to do an inplace modification
of a sequence...


-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From bruno.42.desthuilliers at websiteburo.invalid  Fri May 15 08:58:08 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 15 May 2009 14:58:08 +0200
Subject: Just wondering
In-Reply-To: <mailman.188.1242388571.8015.python-list@python.org>
References: <mailman.188.1242388571.8015.python-list@python.org>
Message-ID: <4a0d66d3$0$3124$426a74cc@news.free.fr>

Gediminas Kregzde a ?crit :
> Hello,
> 
> I'm Vilnius college II degree student and last semester our teacher
> introduced us to python
> I've used to program with Delphi, so I very fast adopted to python
> 
> Now I'm developing cross platform program and use huge amounts of
> data. Program is needed to run as fast as it coud. I've read all tips
> about geting performance, but got 1 bug: map function is slower than
> for loop 

Why should it be a bug ?

> for about 5 times,

read below for comments on your benchmark.

> when using huge amounts of data.
> It is needed to perform some operations, not to return data.

Then don't use map. You're uselessly building a new list (which takes 
time *and* eats RAM - so on 'huge' dataset, this might even make your 
system start swapping).



> I'm adding sample code:
> from time import time

The correct way to time code is to use the timeit module.

> def doit(i):
>    pass
> 
> def main():
>    a = [0] * 10000000
>    t = time()
>    map(doit, a)
>    print "map time: " + str(time() - t)
> 
> def main2():
>    t = time()
>    a = [0] * 10000000
>    for i in a:
>        pass

Your benchmark is screwed. In the first case, you call doit() X times 
(with X = len(a)), while in the second case you don't call it at all.



From davea at ieee.org  Fri May 15 09:02:46 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 09:02:46 -0400
Subject: File System Redirection Windows x 64 box.
In-Reply-To: <4c805dd8-f614-4d5d-aff2-940e7da45c17@g19g2000vbi.googlegroups.com>
References: <4c805dd8-f614-4d5d-aff2-940e7da45c17@g19g2000vbi.googlegroups.com>
Message-ID: <4A0D67F6.6050101@ieee.org>

Rohit Srivastava wrote:
> Hi,
>
> In Windows 2003 x64, I want to call iscsicli.exe which is there only
> in system32 directory.
> Now since in x64 system windows actually redirect the 32 bit
> application to sysWOW64 directory, if it is looking for system32. For
> more information look for
> <http://msdn.microsoft.com/en-us/library/aa384187(VS.85).aspx >
>
> Now my application is being redirected to this directory and from
> python I am always getting an error saying, The program can not find
> the file specified.
>
> Any idea, how  can I overcome this, using python? (Condition :: I must
> complie for 32 bit system only)
> Thanks in Advance
>
> Regards
> Rohit
>
>   
My experience with Microsoft's 64 bit systems is limited to the Itanium 
system (while it was still called Merced), prerelease.

<rabbittrail>
Shadowing directories has to be a big mistake.  And especially if the 
directory is called "system32."   Seems logical that there could be 
another one called "system64".  And that 64 bit applications would have 
to have their sources tweaked while being ported from a different OS.

I remember FILEPATH and DATAPATH, in DOS days.  It tried to 
automatically alias directory locations on a file open, similar to what 
PATH does for program launches.  But many applications, when trying to 
update their files, put the update back in the user-supplied directory, 
so you ended up with two copies, one out of date.   Big mess.
</rabbittrail>

I presume the reason that  iscsicli.exe is located there is that it's a 
64 bit executable?

Why not follow some of the advice in the page you quoted?   You probably 
can't use SysNative, since it was introduced with Vista.  But what's 
wrong with Wow64DisableWow64FsRedirection() ??
see  http://msdn.microsoft.com/en-us/library/aa365743(VS.85).aspx


The page says it's available on Server 2003, as of SP1.  If you can't be 
sure SP1 is installed, I'm not sure what to suggest.  A batch or CMD 
file?   Or are those restricted as well?



From __peter__ at web.de  Fri May 15 09:03:33 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 15 May 2009 15:03:33 +0200
Subject: Just wondering
References: <mailman.188.1242388571.8015.python-list@python.org>
	<gujmst$fq2$00$1@news.t-online.com>
	<mailman.194.1242391000.8015.python-list@python.org>
Message-ID: <gujp6s$k9d$00$1@news.t-online.com>

Jaime Fernandez del Rio wrote:

>> (1) building another throwaway list and
>> (2) function call overhead for calling doit()
>>
>> You can avoid (1) by using filter() instead of map()
> 
> Are you sure of this? 

> I'm afraid there is no builtin function to do an inplace modification
> of a sequence...
 
You are right. 

But the OP invokes map() for the side effect of calling doit(item) for every 
item in the (huge) list and then gets another list of the same length 
containing only None values. by using filter() instead of map() with doit 
always returning None he gets an empty result list which means less wasted 
effort:

>>> items = range(10)
>>> map(doit, items)
[None, None, None, None, None, None, None, None, None, None]
>>> filter(doit, items)
[]

Peter



From e.kroske at gmail.com  Fri May 15 09:06:15 2009
From: e.kroske at gmail.com (Evan Kroske)
Date: Fri, 15 May 2009 09:06:15 -0400
Subject: Your Favorite Python Book
In-Reply-To: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
Message-ID: <4A0D68C7.4070906@gmail.com>

Sam Tregar wrote:
> Greetings. I'm working on learning Python and I'm looking for good 
> books to read. I'm almost done with Dive into Python and I liked it a 
> lot. I found Programming Python a little dry the last time I looked at 
> it, but I'm more motivated now so I might return to it. What's your 
> favorite? Why?
>
> -sam
>
Programming Python is good, but its examples follow a function-based
(not functional) style that I don't like. Most of the applications are a
mix of function libraries and scripts, and there's almost no
object-oriented best-practices content.

I don't have a recommendation; that's the only Python book I own.

-- 
Evan Kroske
Welcome2Obscurity.Blogspot.com <http://welcome2obscurity.blogspot.com>
Glory is fleeting, but obscurity is forever. ? some French guy



From mail at timgolden.me.uk  Fri May 15 09:06:33 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 15 May 2009 14:06:33 +0100
Subject: capture stdout and stderror from within a Windows Service?
In-Reply-To: <1c849439-f572-49c9-b392-3c3e54e5595d@e20g2000vbc.googlegroups.com>
References: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
	<1c849439-f572-49c9-b392-3c3e54e5595d@e20g2000vbc.googlegroups.com>
Message-ID: <4A0D68D9.9010509@timgolden.me.uk>

Chris Curvey wrote:
> Ahhh, Blake put me on the right track.  If you want any of the
> streams, you have to supply values for all of them, like so:
> 
> p = subprocess.Popen(step, shell=True
>       stdout=subprocess.PIPE,
>       stdin=subprocess.PIPE,
>       stderr=subprocess.PIPE)
> 
> (stdout, stderr) = p.communicate()
> 
> and, incidentally, it appears that you have to use UNC paths in your
> Popen call -- drive letters won't work.


This is because you're running in a service. Drive letters
aren't system wide: they're per-user. The service won't
know about any drive letters you or anyone else happens
to have mapped.

TJG


From jaime.frio at gmail.com  Fri May 15 09:08:30 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Fri, 15 May 2009 15:08:30 +0200
Subject: Representing a Tree in Python
In-Reply-To: <74fba814-bd05-4d4d-bf44-63750b2ef428@f1g2000prb.googlegroups.com>
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com>
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>
	<mailman.78.1242202760.8015.python-list@python.org>
	<74fba814-bd05-4d4d-bf44-63750b2ef428@f1g2000prb.googlegroups.com>
Message-ID: <97a8f1a70905150608v5cc79d6bjbcecce31a472ba54@mail.gmail.com>

If you run Dijkstra without a third argument, i.e. without an end
node, the it will compute the shortest paths from your start node to
all nodes in the tree. So by doing something like:

start_node = 1
end_nodes = [2,3,5]

D, P = Dijkstra(G, start_node)

You will then have in D a dictionary with distances to all nodes, and
in P a dictionary of preceding nodes along the shortest path for each
node. You could tweak the Dijkstra function so that it stops when the
minimum distances to all elements of end_nodes have been calculated,
without having to solve for the whole graph...

Apart from that, how you want to store the shortest path information
is up to you, but if you stick to the "graph as a dictionary of
dictionaries" you can construct the subgraph that contains only the
nodes in the shortest paths between the start and the end nodes with
code like this one:

shortest_tree = {}
current_layer = end_nodes
while current_layer != [start_node] :
    new_layer = set()
    for node in current_layer :
        new_node = P[node]
        if new_node in shortest_tree :
            if node not in shortest_tree[new_node] :
                shortest_tree[new_node][node] = G[new_node][node]
        else :
            shodtest_tree[new_node] = {}
            shortest_tree[new_node][node] = G[new_node][node]
        new_layer.add(new_node)
    current_layer = [j for j in new_layer]

I haven't tested the code, and there may be more efficient ways of
achieving the same, though...

Jaime

On Wed, May 13, 2009 at 10:49 AM, godshorse <chinthakawk at gmail.com> wrote:
> On May 13, 3:19?pm, Jaime Fernandez del Rio <jaime.f... at gmail.com>
> wrote:
>> Dijkstra's algorithm computes shortest paths between a node and _ALL_
>> other nodes in the graph. It is usually stopped once computing the
>> shortest path to the target node is done, but that's simply for
>> efficiency, not a limitation of the algorithm. So you should be able
>> to tweak the code you are using so that it provides you with all you
>> are looking for. I'd be surprised if graphine (which, by the way,
>> looks great, CTO) or any other graph package didn't implement it, so
>> switching to that may be the most efficient thing to do.
>>
>> On the other hand, if you want to post your code and links to the
>> Dijkstra code you are using it may be possible to help you with the
>> tweaking...
>>
>> Jaime
>>
>>
>>
>> On Wed, May 13, 2009 at 8:31 AM, godshorse <chinthak... at gmail.com> wrote:
>> > On May 13, 11:54?am, CTO <debat... at gmail.com> wrote:
>> >> On May 13, 12:10?am, godshorse <chinthak... at gmail.com> wrote:
>>
>> >> > Hello,
>>
>> >> > I want to find out the shortest path tree from a root to several nodes
>> >> > in a graph data structure. I found a Dijkstra code from internet that
>> >> > finds shortest path between only two nodes. How can i extend it to a
>> >> > tree?. And what is the best way to represent a tree in Python?.
>>
>> >> > Thank you,
>>
>> >> Well, I'm biased, but I like <URL:http://graphine.org>.
>> >> As an example, to build a five node tree:
>>
>> >> >>> from graph.base import Graph
>> >> >>> g = Graph()
>> >> >>> for i in range(5):
>>
>> >> ... ? ? g.add_node(i)
>> >> ...
>>
>> >> >>> g.add_edge(0, 1)
>> >> >>> g.add_edge(0, 2)
>> >> >>> g.add_edge(1, 3)
>> >> >>> g.add_edge(1, 4)
>>
>> >> And to find the shortest path between, say, node 0 and node 4:
>>
>> >> >>> start = g[0]
>> >> >>> end = g[4]
>> >> >>> distance, edges = g.get_shortest_paths(start)[end]
>> >> >>> distance
>> >> 2
>> >> >>> edges
>>
>> >> [Edge(name=(0,1)), Edge(name=(1,4))]
>>
>> >> Let me know what you think if you decide to use it- I'm looking for
>> >> feedback.
>>
>> >> Geremy Condra
>>
>> > Thanks very much for your reply Geremy. That site was interesting.
>>
>> > Actually the Graph building part is already completed now. I used a
>> > dictionary for that and it works fine. for Dijkstra shortest path
>> > problem your suggestion can be used.
>>
>> > But let me clear the my problem again. I have a graph. and I want to
>> > find 'shortest path tree' from a root node to several nodes. as a
>> > example if we have a graph of 5 nodes from 1 to 5, I need to build the
>> > shortest path tree from node 1 to nodes 2,3,5. So my question is
>> > instead of keeping separate lists for each destination node's shortest
>> > path. How can I represent and store them in a tree structure using
>> > python. Then I can easily find out what are the common nodes in the
>> > path to each destination.
>>
>> > Thanks once again.
>> > --
>> >http://mail.python.org/mailman/listinfo/python-list
>>
>> --
>> (\__/)
>> ( O.o)
>> ( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
>> planes de dominaci?n mundial.
>
> Hello Jaime,
>
> Thanks for the reply.
>
> This is the link to the code that I am using. http://code.activestate.com/recipes/119466/
> What I do in my code is just looping through the destination nodes and
> find the shortest path to each node.
>
> Thanks
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From davea at ieee.org  Fri May 15 09:12:39 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 09:12:39 -0400
Subject: How to catch str exception?
In-Reply-To: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
Message-ID: <4A0D6A47.8000406@ieee.org>

anuraguniyal at yahoo.com wrote:
> import sys
> try:
>     raise "xxx"
> except str,e:
>     print "1",e # is not caught here
> except:# is caught here
>     print "2",sys.exc_type,sys.exc_value
>
> In the above code a string exception is raised which though deprecated
> but still a 3rd party library I use uses it. So how can I catch such
> exception without relying on catch all, which could be bad.
>
> system: Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52) [GCC 4.2.3
> (Ubuntu 4.2.3-2ubuntu7)] on linux2
>
>   
Just fix the except type to be the exception caused by the illegal "raise"

except TypeError,e:
    print "1",e # is caught here


1 exceptions must be classes or instances, not str



From urbangabo at gmail.com  Fri May 15 09:22:52 2009
From: urbangabo at gmail.com (Gabor Urban)
Date: Fri, 15 May 2009 15:22:52 +0200
Subject: New to python, can i ask for a little help? (Andrew Chung)
Message-ID: <f7ac28aa0905150622h2fda100o62f0a69c38005bd2@mail.gmail.com>

I gues, it was rather simple...

Begin with simple tasks, figure out how to do them. If you are
proceding well, then increase difficulty/complexity.

Gabor
-- 
Linux: Choice of a GNU Generation


From manu3d at gmail.com  Fri May 15 09:23:27 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Fri, 15 May 2009 06:23:27 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
	<fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com> 
	<d3631430-f8b9-42ce-af42-df4f3c5ef186@o14g2000vbo.googlegroups.com>
Message-ID: <ad04c939-ff12-4543-9fc5-8a099e99ed0e@x6g2000vbg.googlegroups.com>

Hey Paul,

would you mind continuing this thread on Python + DOM? I'm trying to
implement a DOM Events-like set of classes and I could use another
brain that has some familiarity with the DOM to bounce ideas with. If
you are too busy never mind. Also, I thought of keeping the discussion
here rather than via email, for the benefit of current and future
readers.

Manu


From denis.papathanasiou at gmail.com  Fri May 15 09:27:59 2009
From: denis.papathanasiou at gmail.com (dpapathanasiou)
Date: Fri, 15 May 2009 06:27:59 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<12ef7b00-f0c5-4030-a353-533d93d23cdd@r3g2000vbp.googlegroups.com> 
	<794f117f-4df5-4c6c-be68-f901959b2579@y10g2000prc.googlegroups.com> 
	<d64eeab4-f07c-4f06-a70c-0c78278b2c2f@r34g2000vba.googlegroups.com> 
	<037bc6d0-3d2e-45bd-91d3-d3051fbfa149@s31g2000vbp.googlegroups.com> 
	<55f21331-72eb-4c60-a600-93ac563d1639@p6g2000pre.googlegroups.com>
Message-ID: <5732e99b-7a0c-4845-b105-a8cca15bd0b6@g19g2000vbi.googlegroups.com>


> Were you getting this issue with xml.dom showing on first request all
> the time, or only occasionally occurring? If the latter, were you
> running things in a multithreaded configuration and was the server
> being loaded with lots of concurrent requests?

It was the former.

> For your particular Python installation, does the '_xmlplus' module
> exist? Ie., can you import it as '_xmlplus' or 'xml.doc._xmlplus'?

No, it appears I don't have _xmlplus; neither 'import _xmlplus' nor
'import xml.doc._xmlplus' works.

My python installation is the default which came with debian 5.0
(i.e., I didn't build it from source with unorthodox configuration
options, or use apt).

As a final note, I wound up switching to cElementTree for parsing the
xml (not only for performance but also because the code is much more
concise), and I found that I don't need a full package path with that
module.

I.e, the import statement is:

from cElementTree import ElementTree, Element, SubElement, iterparse,
tostring, fromstring

and within each function I can simply refer to Element, SubElement,
etc. w/o the full path prefix.


From anica_1069 at hotmail.com  Fri May 15 09:58:16 2009
From: anica_1069 at hotmail.com (anica_1069 at hotmail.com)
Date: Fri, 15 May 2009 06:58:16 -0700 (PDT)
Subject: python
Message-ID: <629cf901-516f-4888-90c5-d6174bdf9b5e@r3g2000vbp.googlegroups.com>

hello, I?m a student of linguistic an I need do this exercises. Can
anybody help me,please?
Thanks


? Read in some text from a corpus, tokenize it, and print the list of
all wh-word types that occur. (wh-words in English are used in
questions, relative clauses and exclamations: who, which, what, and so
on.) Print them in order. Are any words duplicated in this list,
because of the presence of case distinctions or punctuation?

? Create a file consisting of words and (made up) frequencies, where
each line consists of a word, the space character, and a positive
integer, e.g. fuzzy 53. Read the file into a Python list using open
(filename).readlines(). Next, break each line into its two fields
using split(), and convert the number into an integer using int(). The
result should be a list of the form: [['fuzzy', 53], ...].


From sam at tregar.com  Fri May 15 10:04:44 2009
From: sam at tregar.com (Sam Tregar)
Date: Fri, 15 May 2009 10:04:44 -0400
Subject: Your Favorite Python Book
In-Reply-To: <4A0D68C7.4070906@gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<4A0D68C7.4070906@gmail.com>
Message-ID: <fe3354e50905150704p68120656w6573e58d5085684@mail.gmail.com>

Thanks for the suggestions everyone!  I've got a copy of Core Python 2nd
Edition on the way.

-sam
-------------- next part --------------
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From anuraguniyal at yahoo.com  Fri May 15 10:12:21 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 15 May 2009 07:12:21 -0700 (PDT)
Subject: How to catch str exception?
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.199.1242393171.8015.python-list@python.org>
Message-ID: <bbc8bd2d-c331-4c2d-a2ef-f137c01d25ec@d2g2000pra.googlegroups.com>


> except TypeError,e:
> ? ? print "1",e # is caught here
>
> 1 exceptions must be classes or instances, not str

doesn't happen so in 2.5.2


From andreengels at gmail.com  Fri May 15 10:15:40 2009
From: andreengels at gmail.com (Andre Engels)
Date: Fri, 15 May 2009 16:15:40 +0200
Subject: python
In-Reply-To: <629cf901-516f-4888-90c5-d6174bdf9b5e@r3g2000vbp.googlegroups.com>
References: <629cf901-516f-4888-90c5-d6174bdf9b5e@r3g2000vbp.googlegroups.com>
Message-ID: <6faf39c90905150715p32fc3384m69684fde1f1fb43e@mail.gmail.com>

We may be willing to help you with your homework, but we will not be
doing it for you. Please tell us what you have got (whether it be a
non-working a program, a partial program or just some ideas about what
you might need to do) and what you think is stopping you from getting
further.

2009/5/15  <anica_1069 at hotmail.com>:
> hello, I?m a student of linguistic an I need do this exercises. Can
> anybody help me,please?
> Thanks
>
>
> ? Read in some text from a corpus, tokenize it, and print the list of
> all wh-word types that occur. (wh-words in English are used in
> questions, relative clauses and exclamations: who, which, what, and so
> on.) Print them in order. Are any words duplicated in this list,
> because of the presence of case distinctions or punctuation?
>
> ? Create a file consisting of words and (made up) frequencies, where
> each line consists of a word, the space character, and a positive
> integer, e.g. fuzzy 53. Read the file into a Python list using open
> (filename).readlines(). Next, break each line into its two fields
> using split(), and convert the number into an integer using int(). The
> result should be a list of the form: [['fuzzy', 53], ...].
> --
> http://mail.python.org/mailman/listinfo/python-list
>





-- 
Andr? Engels, andreengels at gmail.com


From google at mrabarnett.plus.com  Fri May 15 10:17:15 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 15 May 2009 15:17:15 +0100
Subject: How to catch str exception?
In-Reply-To: <86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
Message-ID: <4A0D796B.2000102@mrabarnett.plus.com>

anuraguniyal at yahoo.com wrote:
> but the whole point of catching such exception is that i can print its
> value
> there are many such exceptions and hence it is not feasible to catch
> them all or know them all unless i go thru src code.
> 
If string exceptions are so difficult to use, don't use them! :-)

It would be better to write your own exception class:

class MyException(Exception):
     pass

try:
     raise MyException("Something bad happened!")
except MyException, e:
     print "ERROR: %s" % e


From anuraguniyal at yahoo.com  Fri May 15 10:18:40 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 15 May 2009 07:18:40 -0700 (PDT)
Subject: How to catch str exception?
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
	<mailman.203.1242397029.8015.python-list@python.org>
Message-ID: <08e5a709-3a67-40fd-9765-8f91d85514a5@j18g2000prm.googlegroups.com>


> It would be better to write your own exception class:
>
> class MyException(Exception):
> ? ? ?pass


and how would i automatically inject this into 3rd part library


From moradks at gmail.com  Fri May 15 10:34:19 2009
From: moradks at gmail.com (Morad)
Date: Fri, 15 May 2009 07:34:19 -0700 (PDT)
Subject: Can't run PyQt apps with MacPython
References: <25cdb69b-689c-4cfe-a378-3016b3d50e50@s21g2000vbb.googlegroups.com>
	<gufl3t$6t$1@get-news01.get.basefarm.net>
Message-ID: <ed9257fa-df62-4dbb-b0c5-9129e1c5ffbb@s20g2000vbp.googlegroups.com>

On May 13, 7:29?pm, David Boddie <da... at boddie.org.uk> wrote:
> On Wednesday 13 May 2009 17:53, Morad wrote:
>
> > I recently got a new MacBook Pro with Leopard, and would like to
> > develop using Python and PyQt. I installed the latest Qt SDK, updated
> > MacPython to V 2.5.4 and then proceeded to install SIP and PyQt as
> > described in Mark Summerfield's book on PyQt Programming. Everything
> > went fine and none of the scripts complained. However when I want to
> > run a demo app, I get the error message "Fatal Python error:
> > Interpreter not initialized (version mismatch?) / Abort Trap". Anybody
> > can help?
>
> This page suggests a possible conflict between installed Python
> interpreters:
>
> http://aralbalkan.com/1675/comment-page-1
>
> A post to the PyQt mailing list talks about the correct way to build from
> source, but it may not be relevant in this case:
>
> http://www.riverbankcomputing.com/pipermail/pyqt/2006-July/013766.html
>
> It may just be worth checking that SIP and PyQt were built and installed
> for the interpreter you expected. Failing that, you might want to ask this
> again on the PyQt mailing list:
>
> http://www.riverbankcomputing.com/pipermail/pyqt/
>
> David

Thanks David. What I managed to do as an interim solution is simply to
remove MacPython and reinstall SIP and PyQt using the default version
of Python that comes with Apple, and then everything works. Next I
will retry how to use a more uptodate version, maybe I compiled SIP
etc. with the wrong version. If I have more questions I will use the
PyQt mailing list, thanks for the tip!

Morad


From kyosohma at gmail.com  Fri May 15 10:37:45 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 15 May 2009 07:37:45 -0700 (PDT)
Subject: python
References: <629cf901-516f-4888-90c5-d6174bdf9b5e@r3g2000vbp.googlegroups.com>
Message-ID: <81b65d37-2b40-4479-8568-01044988eb25@h23g2000vbc.googlegroups.com>

On May 15, 8:58 am, anica_1... at hotmail.com wrote:
> hello, I?m a student of linguistic an I need do this exercises. Can
> anybody help me,please?
> Thanks
>
> ? Read in some text from a corpus, tokenize it, and print the list of
> all wh-word types that occur. (wh-words in English are used in
> questions, relative clauses and exclamations: who, which, what, and so
> on.) Print them in order. Are any words duplicated in this list,
> because of the presence of case distinctions or punctuation?


This requires learning file I/O and some string manipulation
techniques. I would probably read each line, split on spaces and then
loop over each word and check for "wh" and add them to a new list.
After reading the file, you'd then use a sort to get them in the right
order.

>
> ? Create a file consisting of words and (made up) frequencies, where
> each line consists of a word, the space character, and a positive
> integer, e.g. fuzzy 53. Read the file into a Python list using open
> (filename).readlines(). Next, break each line into its two fields
> using split(), and convert the number into an integer using int(). The
> result should be a list of the form: [['fuzzy', 53], ...].

I recommend reading the Python Tutorial: http://python.org/doc/

If you're using Python 2.x, then check out http://www.diveintopython.org/

If you're using 3.0, your primary options are the online docs and
"Programming in Python 3" by Summerfield.

- Mike


From moradks at gmail.com  Fri May 15 10:42:26 2009
From: moradks at gmail.com (Morad)
Date: Fri, 15 May 2009 07:42:26 -0700 (PDT)
Subject: Can't run PyQt apps with MacPython
References: <25cdb69b-689c-4cfe-a378-3016b3d50e50@s21g2000vbb.googlegroups.com>
	<gufl3t$6t$1@get-news01.get.basefarm.net>
	<ed9257fa-df62-4dbb-b0c5-9129e1c5ffbb@s20g2000vbp.googlegroups.com>
Message-ID: <2fb6276d-761f-4311-bc8d-3868dc7e2a29@z19g2000vbz.googlegroups.com>

On May 15, 10:34?am, Morad <mora... at gmail.com> wrote:
> On May 13, 7:29?pm, David Boddie <da... at boddie.org.uk> wrote:
>
>
>
> > On Wednesday 13 May 2009 17:53, Morad wrote:
>
> > > I recently got a new MacBook Pro with Leopard, and would like to
> > > develop using Python and PyQt. I installed the latest Qt SDK, updated
> > > MacPython to V 2.5.4 and then proceeded to install SIP and PyQt as
> > > described in Mark Summerfield's book on PyQt Programming. Everything
> > > went fine and none of the scripts complained. However when I want to
> > > run a demo app, I get the error message "Fatal Python error:
> > > Interpreter not initialized (version mismatch?) / Abort Trap". Anybody
> > > can help?
>
> > This page suggests a possible conflict between installed Python
> > interpreters:
>
> >http://aralbalkan.com/1675/comment-page-1
>
> > A post to the PyQt mailing list talks about the correct way to build from
> > source, but it may not be relevant in this case:
>
> >http://www.riverbankcomputing.com/pipermail/pyqt/2006-July/013766.html
>
> > It may just be worth checking that SIP and PyQt were built and installed
> > for the interpreter you expected. Failing that, you might want to ask this
> > again on the PyQt mailing list:
>
> >http://www.riverbankcomputing.com/pipermail/pyqt/
>
> > David
>
> Thanks David. What I managed to do as an interim solution is simply to
> remove MacPython and reinstall SIP and PyQt using the default version
> of Python that comes with Apple, and then everything works. Next I
> will retry how to use a more uptodate version, maybe I compiled SIP
> etc. with the wrong version. If I have more questions I will use the
> PyQt mailing list, thanks for the tip!
>
> Morad

Quick update: I now also managed to get things working with a newer
version of MacPython (2.5.4) and everything looks fine. The trick
seems to be that if a terminal window is open prior to the MacPython
install, it will NOT use the new version of python. So one has to
close it and open a new terminal window, and only then should one
compile SIP and PyQt.

Anyway, thanks again for the help.
Morad


From paul at boddie.org.uk  Fri May 15 10:42:29 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Fri, 15 May 2009 07:42:29 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
	<fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com> 
	<d3631430-f8b9-42ce-af42-df4f3c5ef186@o14g2000vbo.googlegroups.com> 
	<ad04c939-ff12-4543-9fc5-8a099e99ed0e@x6g2000vbg.googlegroups.com>
Message-ID: <9b5ecc41-532d-460b-a552-bf99cc9c095d@u10g2000vbd.googlegroups.com>

On 15 Mai, 15:23, "Emanuele D'Arrigo" <man... at gmail.com> wrote:
> Hey Paul,
>
> would you mind continuing this thread on Python + DOM? I'm trying to
> implement a DOM Events-like set of classes and I could use another
> brain that has some familiarity with the DOM to bounce ideas with. If
> you are too busy never mind. Also, I thought of keeping the discussion
> here rather than via email, for the benefit of current and future
> readers.

Sure! Just keep your observations coming! I've made a very lazy
attempt at DOM Events support in libxml2dom, since it looked as if it
might be necessary when providing elementary SVG Tiny support (which
also isn't finished), although I find these things quite hard to
figure out with the usual vagueness of the specifications on certain
crucial implementation-related details (and that there's a mountain of
specifications that one has to navigate).

One of my tests tries to exercise the code, but I might be doing it
all completely wrong:

https://hg.boddie.org.uk/libxml2dom/file/91c0764ac7c6/tests/svg_events.py

It occurs to me that various PyQt- and PyKDE-related bindings might
also provide some exposure to DOM Events, although I had heard that
WebKit, which should have support for lots of DOM features, exposes
some pretty useless interfaces to languages like Python, currently.
The situation with Mozilla and PyXPCOM may well be similar.

Paul


From google at mrabarnett.plus.com  Fri May 15 10:43:27 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 15 May 2009 15:43:27 +0100
Subject: How to catch str exception?
In-Reply-To: <08e5a709-3a67-40fd-9765-8f91d85514a5@j18g2000prm.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>	<mailman.187.1242377429.8015.python-list@python.org>	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>	<mailman.203.1242397029.8015.python-list@python.org>
	<08e5a709-3a67-40fd-9765-8f91d85514a5@j18g2000prm.googlegroups.com>
Message-ID: <4A0D7F8F.2010007@mrabarnett.plus.com>

anuraguniyal at yahoo.com wrote:
>> It would be better to write your own exception class:
>>
>> class MyException(Exception):
>>      pass
> 
> 
> and how would i automatically inject this into 3rd part library

Ah, I wasn't reading carefully enough! :-)


From mrstevegross at gmail.com  Fri May 15 10:50:04 2009
From: mrstevegross at gmail.com (mrstevegross)
Date: Fri, 15 May 2009 07:50:04 -0700 (PDT)
Subject: Import w/ '.' syntax
Message-ID: <c3d94583-60f9-4b1b-8687-74727e2bbbd7@q14g2000vbn.googlegroups.com>

Remind me: is it possible to craft an import statement like this:
  import foo.bar

If so, what's going on here exactly? Is Python looking for a module
called 'bar', in a directory called 'foo', in a search path somewhere?
Or am I totally misunderstanding the import semantics.

Thanks,
--Steve


From jeff at jmcneil.net  Fri May 15 10:59:10 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Fri, 15 May 2009 07:59:10 -0700 (PDT)
Subject: Your Favorite Python Book
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com> 
	<mailman.6.1242078341.8015.python-list@python.org>
Message-ID: <88cb0d42-ae96-4407-a8a6-dcc6e0300e4d@g20g2000vba.googlegroups.com>

On May 11, 5:45?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Mon, May 11, 2009 at 1:44 PM, Sam Tregar <s... at tregar.com> wrote:
> > Greetings.? I'm working on learning Python and I'm looking for good books to
> > read.? I'm almost done with Dive into Python and I liked it a lot. I found
> > Programming Python a little dry the last time I looked at it, but I'm more
> > motivated now so I might return to it.? What's your favorite?? Why?
>
> I like "Python in a Nutshell" as a reference book, although it's now
> slightly outdated given Python 3.0's release (the book is circa 2.5).
>
> Cheers,
> Chris
> --http://blog.rebertia.com

I second this. I've got a small stack of reference books on Python and
this is the most ripped up, coffee-stained, ragged piece of junk I
own. It's even more beat up than my K&R book which I've probably had
four times as long.  Everyone knows that's how you rate your techie
books... the more beat up they are, the higher the quality.

The book is laid out wonderfully.  You've got an tutorial that's
geared towards programmers, language reference, some advanced topics,
and then module reference.

Also, have a look at www.pylonsbook.com once you get the language
down. I've come to like this one as well because you'll also learn a
lot about Python development in general from it. A lot of the
knowledge transfers out of the web development arena into other areas
of programming.





From rustompmody at gmail.com  Fri May 15 11:03:09 2009
From: rustompmody at gmail.com (Rustom Mody)
Date: Fri, 15 May 2009 20:33:09 +0530
Subject: using urlretrive/urlopen
Message-ID: <f46c52560905150803i15ad7968m5fc13738906f8e7d@mail.gmail.com>

I am trying to talk to a server that runs on localhost
The server runs on http://localhost:7000/ and that opens alright in? a
web browser.

However if I use urlopen or urlretrieve what I get is this 'file' --
obviously not the one that the browser gets:

<html><body bgcolor="#ffffff">
Query 'http://localhost:7000/' not implemented
</body></html>
Any tips/clues?

This is python2.6


From jeff at jmcneil.net  Fri May 15 11:20:17 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Fri, 15 May 2009 08:20:17 -0700 (PDT)
Subject: Import w/ '.' syntax
References: <c3d94583-60f9-4b1b-8687-74727e2bbbd7@q14g2000vbn.googlegroups.com>
Message-ID: <ccc3df06-f843-425c-9b26-73f6b109b8fc@o14g2000vbo.googlegroups.com>

On May 15, 10:50?am, mrstevegross <mrstevegr... at gmail.com> wrote:
> Remind me: is it possible to craft an import statement like this:
> ? import foo.bar
>
> If so, what's going on here exactly? Is Python looking for a module
> called 'bar', in a directory called 'foo', in a search path somewhere?
> Or am I totally misunderstanding the import semantics.
>
> Thanks,
> --Steve

In that specific case, you're looking for a module 'bar' in the 'foo'
package, which should be located somewhere on sys.path.

http://docs.python.org/tutorial/modules.html

That covers it pretty well.

Thanks,

Jeff
mcjeff.blogspot.com


From mrstevegross at gmail.com  Fri May 15 11:26:27 2009
From: mrstevegross at gmail.com (mrstevegross)
Date: Fri, 15 May 2009 08:26:27 -0700 (PDT)
Subject: Import w/ '.' syntax
References: <c3d94583-60f9-4b1b-8687-74727e2bbbd7@q14g2000vbn.googlegroups.com>
	<ccc3df06-f843-425c-9b26-73f6b109b8fc@o14g2000vbo.googlegroups.com>
Message-ID: <55daa203-0c7c-4524-8ceb-0ced2ab65b0d@m24g2000vbp.googlegroups.com>

> In that specific case, you're looking for a module 'bar' in the 'foo'
> package, which should be located somewhere on sys.path.
>
> http://docs.python.org/tutorial/modules.html
>
> That covers it pretty well.

Aha! 'packages'! That makes sense.

Thanks,
--Steve


From python at bdurham.com  Fri May 15 11:35:09 2009
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 15 May 2009 11:35:09 -0400
Subject: Case insensitive version of string.Template?
Message-ID: <1242401709.20313.1315649183@webmail.messagingengine.com>

Using Python 2.6 or higher: Is there a way to configure
string.Template() to ignore the case of matched identifiers?
In other words, given the following Template string and
dictionary where all keys are lowercase, is there a way to have
my identifiers expanded based on their lowercase values?
import string
values = dict( name='John Doe', phone='999-555-1212' )
output = string.Template( 'My name is $NAME and my phone is
$Phone.' ).safe_substitute( values )
Thank you,
Malcolm
-------------- next part --------------
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From kyosohma at gmail.com  Fri May 15 11:41:53 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 15 May 2009 08:41:53 -0700 (PDT)
Subject: Your Favorite Python Book
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com> 
	<mailman.6.1242078341.8015.python-list@python.org>
Message-ID: <e1db4ac7-4997-401b-9a1f-112787a9ed92@r3g2000vbp.googlegroups.com>

On May 11, 4:45?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Mon, May 11, 2009 at 1:44 PM, Sam Tregar <s... at tregar.com> wrote:
> > Greetings.? I'm working on learning Python and I'm looking for good books to
> > read.? I'm almost done with Dive into Python and I liked it a lot. I found
> > Programming Python a little dry the last time I looked at it, but I'm more
> > motivated now so I might return to it.? What's your favorite?? Why?
>
> I like "Python in a Nutshell" as a reference book, although it's now
> slightly outdated given Python 3.0's release (the book is circa 2.5).
>
> Cheers,
> Chris
> --http://blog.rebertia.com

I use Hetland's "Beginning Python" and Chun's "Core Python
Programming" the most, although I haven't used them in a while. I also
use Martelli's "Python Cookbook" from time-to-time. Hopefully he will
put out a 3.0 version too.

Mike


From davea at ieee.org  Fri May 15 11:48:02 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 11:48:02 -0400
Subject: How to catch str exception?
In-Reply-To: <bbc8bd2d-c331-4c2d-a2ef-f137c01d25ec@d2g2000pra.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>	<mailman.199.1242393171.8015.python-list@python.org>
	<bbc8bd2d-c331-4c2d-a2ef-f137c01d25ec@d2g2000pra.googlegroups.com>
Message-ID: <4A0D8EB2.2010905@ieee.org>



anuraguniyal at yahoo.com wrote:
>> except TypeError,e:
>>     print "1",e # is caught here
>>
>> 1 exceptions must be classes or instances, not str
>>     
>
> doesn't happen so in 2.5.2
>
>   
I tested it in 2.6.2

Perhaps you could try something like:

try:
    raise "xxx"
except Exception, e:
    print "1",e # is caught here
    ...and then test e.message and reraise if necessary




From mail at timgolden.me.uk  Fri May 15 11:54:58 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 15 May 2009 16:54:58 +0100
Subject: (Windows) Finding out which process has locked a file.
In-Reply-To: <0a981c1d-871b-4917-8fd3-03493d6dbed3@o30g2000vbc.googlegroups.com>
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>	<guh02f$re4$2@lust.ihug.co.nz>	<mailman.180.1242355642.8015.python-list@python.org>
	<4191d437-ba03-408b-951f-ca7ec4b49bd7@o30g2000vbc.googlegroups.com>
	<mailman.184.1242373818.8015.python-list@python.org>
	<0a981c1d-871b-4917-8fd3-03493d6dbed3@o30g2000vbc.googlegroups.com>
Message-ID: <4A0D9052.8070906@timgolden.me.uk>

CinnamonDonkey wrote:
> Thanx for the response Tim! :-) Great site!
> 
>  > I'm genuinely surprised to hear you say that...
> 
> Early morning frustration... I appologise to all... you are totally
> right. Thank you to all for the responses.

Well it's big of you to apologise. In return, I've managed to knock
up an example of determining locked file owners. But it is a tad
messy. I'll try to work it up into an annotated example, but for
now it's on pastebin:

  http://python.pastebin.com/m7b4e420a

It manages to mix pywin32, ctypes and wmi over COM via my WMI module.
I may have missed some useful shortcuts but I think it does enough
to illustrate what's going on. It's mostly a translation of a
posting which I'll try to link to when I can find it again, to
give credit where it's due.


> Thanx TJG for the reality check ;-)

Well I hope the above is helpful.

TJG


From pecora at anvil.nrl.navy.mil  Fri May 15 12:05:12 2009
From: pecora at anvil.nrl.navy.mil (Lou Pecora)
Date: Fri, 15 May 2009 12:05:12 -0400
Subject: Your Favorite Python Book
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<mailman.6.1242078341.8015.python-list@python.org>
	<e1db4ac7-4997-401b-9a1f-112787a9ed92@r3g2000vbp.googlegroups.com>
Message-ID: <pecora-532361.12051215052009@ra.nrl.navy.mil>

In article 
<e1db4ac7-4997-401b-9a1f-112787a9ed92 at r3g2000vbp.googlegroups.com>,
 Mike Driscoll <kyosohma at gmail.com> wrote:

> On May 11, 4:45?pm, Chris Rebert <c... at rebertia.com> wrote:

> >
> > I like "Python in a Nutshell" as a reference book, although it's now
> > slightly outdated given Python 3.0's release (the book is circa 2.5).
> >
> > Cheers,
> > Chris

"Python in a Nutshell" -- Absolutely!  Covers a lot in an easily 
accessible way.  The first book I reach for.  I hope Martelli updates it 
to 3.0.

-- 
-- Lou Pecora


From xamalek at yahoo.com  Fri May 15 12:12:24 2009
From: xamalek at yahoo.com (xamalek at yahoo.com)
Date: Fri, 15 May 2009 09:12:24 -0700 (PDT)
Subject: Parsing Strings in Enclosed in Curly Braces
Message-ID: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>

How do you parse a string enclosed in Curly Braces?

For instance:

x = "{ABC EFG IJK LMN OPQ}"

I want to do x.split('{} ') and it does not work. Why does it not work
and what are EXCEPTIONS to using the split method?

That I want to split based on '{', '}' and WHITESPACE.

Please advise.

Regards,
Xav


From xamalek at yahoo.com  Fri May 15 12:15:54 2009
From: xamalek at yahoo.com (xamalek at yahoo.com)
Date: Fri, 15 May 2009 09:15:54 -0700 (PDT)
Subject: Printing a hex character and prefixing it correctly
Message-ID: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>

If I have an integer k, for instance;

k = 32 // BASE 10

How do I get print to print it out in HEX and PREFIXED with 0x? What
is the PROPER WAY?

This does not work:

  print "This is hex 32: ", int(k, 16)

Xav


From clp2 at rebertia.com  Fri May 15 12:19:52 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 15 May 2009 09:19:52 -0700
Subject: Parsing Strings in Enclosed in Curly Braces
In-Reply-To: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
Message-ID: <50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com>

On Fri, May 15, 2009 at 9:12 AM,  <xamalek at yahoo.com> wrote:
> How do you parse a string enclosed in Curly Braces?
>
> For instance:
>
> x = "{ABC EFG IJK LMN OPQ}"
>
> I want to do x.split('{} ') and it does not work. Why does it not work
> and what are EXCEPTIONS to using the split method?

.split() takes a *substring* to split on, *not* a set of individual
characters to split on. Read the Fine Docs.

> That I want to split based on '{', '}' and WHITESPACE.

Well, you could use a regex, or you could just .find() where the
braces are, slice them off the ends of the string, and then split the
result on space.

Cheers,
Chris
-- 
http://blog.rebertia.com


From kyosohma at gmail.com  Fri May 15 12:23:31 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 15 May 2009 09:23:31 -0700 (PDT)
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
Message-ID: <83b69965-bee6-42e7-ac32-e7b7cf4e5617@s21g2000vbb.googlegroups.com>

On May 15, 11:12?am, xama... at yahoo.com wrote:
> How do you parse a string enclosed in Curly Braces?
>
> For instance:
>
> x = "{ABC EFG IJK LMN OPQ}"
>
> I want to do x.split('{} ') and it does not work. Why does it not work
> and what are EXCEPTIONS to using the split method?
>
> That I want to split based on '{', '}' and WHITESPACE.
>
> Please advise.
>
> Regards,
> Xav

The reason it doesn't work is that you don't have a string with "{}".
Instead, you have one of each. If your string was like this, then it
would split:

x = "{} ABC EFG"

In the mean time, you can just use some string slicing like this:

y = x[1:-1]

That will remove the braces and allow you to manipulate the text
therein.

- Mike


From manu3d at gmail.com  Fri May 15 12:27:17 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Fri, 15 May 2009 09:27:17 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
	<fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com> 
	<d3631430-f8b9-42ce-af42-df4f3c5ef186@o14g2000vbo.googlegroups.com> 
	<ad04c939-ff12-4543-9fc5-8a099e99ed0e@x6g2000vbg.googlegroups.com> 
	<9b5ecc41-532d-460b-a552-bf99cc9c095d@u10g2000vbd.googlegroups.com>
Message-ID: <758b4300-b522-40ed-81bf-4cc824284f6c@s31g2000vbp.googlegroups.com>

Hi Paul, thank you for your swift reply!

On May 15, 3:42?pm, Paul Boddie <p... at boddie.org.uk> wrote:
> Sure! Just keep your observations coming! I've made a very lazy
> attempt at DOM Events support in libxml2dom,

I just had a look at libxml2dom, in particular its events.py file.
Given that we are working from a standard your implementation is
exceedingly similar to mine and had I know before I started writing my
own classes I would have started from it instead! =)
Browsing through the code, the EventTarget class docstring reads:

    The listeners for a node are accessed through the global object.
This common
    collection is consequently accessed by all nodes in a document,
meaning that
    distinct objects representing the same node can still obtain the
set of
    listeners registered for that node. In contrast, any attempt to
directly
    store listeners on particular objects would result in the specific
object
    which registered the listeners holding the record of such objects,
whereas
    other objects obtained independently for the same node would hold
no such
    record.

Naively, I implemented my EventTarget class storing its own listeners
rather than global ones. Nevertheless, I'm not quite understanding
this issue. Why shouldn't the listeners be stored directly on the
EventTarget? I have a glimpse of understanding that if the
DOMImplementation keeps EventTarget and Nodes (or Elements? which
entity is supposed to support Events?) separate this might be
necessary. But beside the fact that it's just a fuzzy and potentially
incorrect intuition, I seem to think that the appropriate way to
proceed would be for the DOMImplementation to provide a Node class
that also inherits from EventTarget. In so doing the listeners would
be immediately accessible as soon as one has a handle to a Node.

Furthermore, your code finds the bubbling route with the line:

bubble_route = target.xpath("ancestor::*")

That xpath method is a libxml method right?

> (...) although I find these things quite hard to
> figure out with the usual vagueness of the specifications on certain
> crucial implementation-related details (and that there's a mountain of
> specifications that one has to navigate).

Indeed there is some vagueness in the W3C recommendations and the
various documents offer very little redundancy with each other but
require you to be knowledgeable about them all! I'm managing to piece
together the pieces of the puzzle only after a couple of day having an
in-depth read-through of DOM, DOM Events and a little bit of XML
events to see how it all works in practice. XML events is also what's
prompting me to think that Node/Elements classes of the implementation
should also inherit from EventTarget as they can all be event
targets.

> One of my tests tries to exercise the code, but I might be doing it
> all completely wrong:
>
> https://hg.boddie.org.uk/libxml2dom/file/91c0764ac7c6/tests/svg_event...

Before I can comment I'd like to better understand what you are aiming
for with libxml2dom. It seems to be providing some kind of conversion
services from the xml structure generated by libxml to a dom-like
structure (implemented by pxdom?).
Is that correct?

> It occurs to me that various PyQt- and PyKDE-related bindings might
> also provide some exposure to DOM Events, although I had heard that
> WebKit, which should have support for lots of DOM features, exposes
> some pretty useless interfaces to languages like Python, currently.
> The situation with Mozilla and PyXPCOM may well be similar.

PyKDE is off-limits because it's unix only while I'm trying to be
cross-platform. PyQT is interesting. Very. Further investigation is
required. =)

Manu



From clp2 at rebertia.com  Fri May 15 12:43:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 15 May 2009 09:43:57 -0700
Subject: Printing a hex character and prefixing it correctly
In-Reply-To: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
References: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
Message-ID: <50697b2c0905150943s1c2abbd6l7ee4c3f51d8a7c70@mail.gmail.com>

On Fri, May 15, 2009 at 9:15 AM,  <xamalek at yahoo.com> wrote:
> If I have an integer k, for instance;
>
> k = 32 // BASE 10
>
> How do I get print to print it out in HEX and PREFIXED with 0x? What
> is the PROPER WAY?
>
> This does not work:
>
> ?print "This is hex 32: ", int(k, 16)

print "This is hex 32:", hex(k)

print int("0xA", 16) #==> 10

I would recommend you read the tutorial and/or library reference if
you haven't already.

Cheers,
Chris
-- 
http://blog.rebertia.com


From nonsense at mynonsense.net  Fri May 15 12:45:26 2009
From: nonsense at mynonsense.net (nonsense at mynonsense.net)
Date: Fri, 15 May 2009 09:45:26 -0700 (PDT)
Subject: Autosizing column widths in Excel using win32com.client ?
Message-ID: <f03c4bd7-6250-496c-a58f-c6f09ba724f2@f16g2000vbf.googlegroups.com>

Is there a way to autosize the widths of the excel columns as when you
double click them manually?


From andreas.tawn at ubisoft.com  Fri May 15 12:49:45 2009
From: andreas.tawn at ubisoft.com (Andreas Tawn)
Date: Fri, 15 May 2009 18:49:45 +0200
Subject: Printing a hex character and prefixing it correctly
In-Reply-To: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
References: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
Message-ID: <8AEDA5E3386EA742B8C24C95FF0C758006E7C114@PDC-MAIL3.ubisoft.org>

> If I have an integer k, for instance;
> 
> k = 32 // BASE 10
> 
> How do I get print to print it out in HEX and PREFIXED with 0x? What
> is the PROPER WAY?
> 
> This does not work:
> 
>   print "This is hex 32: ", int(k, 16)
> 
> Xav

k = 32

print "This is hex 32: ", hex(k)

Cheers,

Drea


From nonsense at mynonsense.net  Fri May 15 12:50:03 2009
From: nonsense at mynonsense.net (nonsense at mynonsense.net)
Date: Fri, 15 May 2009 09:50:03 -0700 (PDT)
Subject: Finding location of an executable in a windows machine?
Message-ID: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>

My python script calls another windows program file. I have the path
to that program hardcoded in it. Is there a way for python to
automatically find the path to this program?

testapp_path = "C:\\Program Files\\testapp\\version\\61\\"

Or do i have to do a brute force approach to searching all drives/
folders till it finds a path matching my program name?


From bgeddy at gmail.com  Fri May 15 12:56:24 2009
From: bgeddy at gmail.com (BgEddy)
Date: Fri, 15 May 2009 17:56:24 +0100
Subject: Printing a hex character and prefixing it correctly
References: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
Message-ID: <Y8hPl.126868$y17.112508@newsfe11.ams2>

xamalek at yahoo.com wrote:

> If I have an integer k, for instance;
> 
> k = 32 // BASE 10
> 
> How do I get print to print it out in HEX and PREFIXED with 0x? What
> is the PROPER WAY?
> 
> This does not work:
> 
>   print "This is hex 32: ", int(k, 16)
> 
> Xav

How about this :

k=32
print "This is hex 32: 0x%02X" % k

Kind Regards,
BgEddy



From toby at tobiah.org  Fri May 15 12:57:56 2009
From: toby at tobiah.org (Tobiah)
Date: Fri, 15 May 2009 09:57:56 -0700
Subject: Sorting a dictionary
References: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>
	<mailman.38.1242131009.8015.python-list@python.org>
Message-ID: <pan.2009.05.15.16.57.56.526185@tobiah.org>

On Tue, 12 May 2009 14:17:54 +0200, Jaime Fernandez del Rio wrote:

> This one I think I know... Try with:
> 
> for k in sorted(word_count) :
>     print k,"=",word_count[k]
> 
> You need to do the sorting before iterating over the keys...

Isn't that what's happening here?  I read this as the
'sorted' function iterating over the keys in word_count,
then passing that sorted list to the 'for' loop, for a
second iteration over the sorted pairs.

No?

Tobiah


From jcd at sdf.lonestar.org  Fri May 15 13:20:33 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 15 May 2009 13:20:33 -0400
Subject: Sorting a dictionary
In-Reply-To: <pan.2009.05.15.16.57.56.526185@tobiah.org>
References: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>
	<mailman.38.1242131009.8015.python-list@python.org>
	<pan.2009.05.15.16.57.56.526185@tobiah.org>
Message-ID: <1242408033.6524.9.camel@aalcdl07>

On Fri, 2009-05-15 at 09:57 -0700, Tobiah wrote:
> On Tue, 12 May 2009 14:17:54 +0200, Jaime Fernandez del Rio wrote:
> 
> > This one I think I know... Try with:
> > 
> > for k in sorted(word_count) :
> >     print k,"=",word_count[k]
> > 
> > You need to do the sorting before iterating over the keys...
> 
> Isn't that what's happening here?  I read this as the
> 'sorted' function iterating over the keys in word_count,
> then passing that sorted list to the 'for' loop, for a
> second iteration over the sorted pairs.
> 
> No?
> 
> Tobiah

The code and the description you are responding to are by the same
poster.  The OP posted something quite different.

@Ronn:

The for statement, which is the line ending with ":" has all the control
over what order elements get processed in.  Compare the following cases:

>>> for x in ['hat', 'socks', 'shirt', 'pants']:
...     print sorted(x)
aht
ckoss
hirst
anpst

In this case, each element of the list gets sorted.  That is, the
letters of each string are put in alphabetical order.  But they are
processed in the order they appeared in the list.  If you want to
process the elements of the list in alphabetical order, you have to sort
the list itself:

>>> for x in sorted(['hat', 'socks', 'shirt', 'pants']):
...     print x
hat
pants
shirt
socks

Cheers,
Cliff





From google at mrabarnett.plus.com  Fri May 15 13:25:55 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 15 May 2009 18:25:55 +0100
Subject: Parsing Strings in Enclosed in Curly Braces
In-Reply-To: <50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com>
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
	<50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com>
Message-ID: <4A0DA5A3.4080203@mrabarnett.plus.com>

Chris Rebert wrote:
> On Fri, May 15, 2009 at 9:12 AM,  <xamalek at yahoo.com> wrote:
>> How do you parse a string enclosed in Curly Braces?
>>
>> For instance:
>>
>> x = "{ABC EFG IJK LMN OPQ}"
>>
>> I want to do x.split('{} ') and it does not work. Why does it not work
>> and what are EXCEPTIONS to using the split method?
> 
> .split() takes a *substring* to split on, *not* a set of individual
> characters to split on. Read the Fine Docs.
> 
>> That I want to split based on '{', '}' and WHITESPACE.
> 
> Well, you could use a regex, or you could just .find() where the
> braces are, slice them off the ends of the string, and then split the
> result on space.
> 
Here's a function which splits on multiple characters:

def split_many(string, delimiters):
     parts = [string]
     for d in delimiters:
         parts = sum((p.split(d) for p in parts), [])
     return parts


From google at mrabarnett.plus.com  Fri May 15 13:32:21 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 15 May 2009 18:32:21 +0100
Subject: Finding location of an executable in a windows machine?
In-Reply-To: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>
References: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>
Message-ID: <4A0DA725.9020109@mrabarnett.plus.com>

nonsense at mynonsense.net wrote:
> My python script calls another windows program file. I have the path
> to that program hardcoded in it. Is there a way for python to
> automatically find the path to this program?
> 
> testapp_path = "C:\\Program Files\\testapp\\version\\61\\"
> 
> Or do i have to do a brute force approach to searching all drives/
> folders till it finds a path matching my program name?

The path to the Python script is given by __file__. If your other
program is in the same folder then you can use:

     other_app_path = os.path.join(os.path.dirname(__file__), 
other_app_name)


From aahz at pythoncraft.com  Fri May 15 13:34:13 2009
From: aahz at pythoncraft.com (Aahz)
Date: 15 May 2009 10:34:13 -0700
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<4a0c6e42$0$12031$426a74cc@news.free.fr>
	<guhsvv$cu$1@panix3.panix.com>
	<4a0d2e07$0$9422$426a74cc@news.free.fr>
Message-ID: <guk92l$gug$1@panix3.panix.com>

In article <4a0d2e07$0$9422$426a74cc at news.free.fr>,
Bruno Desthuilliers  <bruno.42.desthuilliers at websiteburo.invalid> wrote:
>Aahz a ?crit :
>> In article <4a0c6e42$0$12031$426a74cc at news.free.fr>,
>> Bruno Desthuilliers  <bdesth.quelquechose at free.quelquepart.fr> wrote:
>>> Marco Mariani a ?crit :
>>>> Bruno Desthuilliers wrote:
>>>>> Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
>>>>> sense given Python's dynamic typing.
>>>> Unless he's really trying to write in Nohtyp,
>>> You meant "Notype" ?-)
>> 
>> Marco's spelling is correct.  Try "Nohtyp".reverse()
>
>Aazh... I know I'm a bit dumb sometimes, but do you *really* think I had 
>failed to spot this ???

<shrug>  IIRC, English isn't your first language, so I figured better
safe than sorry; humor often mistranslates.  My apologies for casting
aspersions on your linguistic skills.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From davea at ieee.org  Fri May 15 13:49:56 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 13:49:56 -0400
Subject: Printing a hex character and prefixing it correctly
In-Reply-To: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
References: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
Message-ID: <4A0DAB44.2050802@ieee.org>

xamalek at yahoo.com wrote:
> If I have an integer k, for instance;
>
> k = 32 // BASE 10
>
> How do I get print to print it out in HEX and PREFIXED with 0x? What
> is the PROPER WAY?
>
> This does not work:
>
>   print "This is hex 32: ", int(k, 16)
>
> Xav
>
>   
How about
    print "This is hex 32: ", hex(k)


(This works in Python 2.6.2)



From davea at ieee.org  Fri May 15 14:01:18 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 14:01:18 -0400
Subject: Finding location of an executable in a windows machine?
In-Reply-To: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>
References: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>
Message-ID: <4A0DADEE.8060706@ieee.org>

nonsense at mynonsense.net wrote:
> My python script calls another windows program file. I have the path
> to that program hardcoded in it. Is there a way for python to
> automatically find the path to this program?
>
> testapp_path = "C:\\Program Files\\testapp\\version\\61\\"
>
> Or do i have to do a brute force approach to searching all drives/
> folders till it finds a path matching my program name?
>
>
>   
Do you actually need the path, or do you just want the program to run as 
though you had entered it at a command prompt?  Many of the APIs for 
launching other programs will do a path search, similar to what the DOS 
box in Windows does.  Try just leaving off the path entirely.

Or you can get the PATH environment variable, parse it, and search for 
those locations yourself.  But realize that the shell also looks in a 
few places not on the path, including at least  current directory and 
windows directory (eg.  c:\windows\system32 ).  And you very likely want 
to look a few other places, such as in Program Files.

But searching the drives raw is rarely a good idea, as it's quite likely 
there's a duplicate filename out there somewhere, and you want a 
deterministic algorithm for which one will run.

Depending on how fancy your program is, you may want to do the searching 
at install time, and store the result in an xxx.ini file or equivalent.  
That file would probably go somewhere in "Documents and Settings" 
directory structure, perhaps based on the current user.  That way you 
can document how the user will customize it.

If you need help on a specific python command, you'd also need to tell 
us what version of Python you're using.
     print sys.version



From paul at boddie.org.uk  Fri May 15 14:08:11 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Fri, 15 May 2009 11:08:11 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
	<fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com> 
	<d3631430-f8b9-42ce-af42-df4f3c5ef186@o14g2000vbo.googlegroups.com> 
	<ad04c939-ff12-4543-9fc5-8a099e99ed0e@x6g2000vbg.googlegroups.com> 
	<9b5ecc41-532d-460b-a552-bf99cc9c095d@u10g2000vbd.googlegroups.com> 
	<758b4300-b522-40ed-81bf-4cc824284f6c@s31g2000vbp.googlegroups.com>
Message-ID: <d52b1ce8-0ad7-41a3-9edb-eb3ef6ebeb21@b1g2000vbc.googlegroups.com>

On 15 Mai, 18:27, "Emanuele D'Arrigo" <man... at gmail.com> wrote:
>
> I just had a look at libxml2dom, in particular its events.py file.
> Given that we are working from a standard your implementation is
> exceedingly similar to mine and had I know before I started writing my
> own classes I would have started from it instead! =)

Another implementation is probably a good thing, though, since I don't
trust my own interpretation of the specifications. ;-)

> Browsing through the code, the EventTarget class docstring reads:

[Long docstring cut]

> Naively, I implemented my EventTarget class storing its own listeners
> rather than global ones. Nevertheless, I'm not quite understanding
> this issue. Why shouldn't the listeners be stored directly on the
> EventTarget?

One reason for this might well be due to the behaviour of libxml2 and
libxml2dom: if I visit the same node in a document twice, obtaining a
node instance each time, these two instances will be different;
therefore, storing listeners on such instances is not very helpful
because the expectation that you will automatically see previously
added listeners on a node will not generally be fulfilled. With pxdom,
it may be a different situation, but libxml2dom is constrained by the
behaviour of libxml2: I don't attempt to check node equivalence and
then expose the structures representing a single node using a single
object; I generally try and instantiate as few Python objects,
wrapping libxml2 structures, as I can.

> I have a glimpse of understanding that if the
> DOMImplementation keeps EventTarget and Nodes (or Elements? which
> entity is supposed to support Events?) separate this might be
> necessary. But beside the fact that it's just a fuzzy and potentially
> incorrect intuition, I seem to think that the appropriate way to
> proceed would be for the DOMImplementation to provide a Node class
> that also inherits from EventTarget. In so doing the listeners would
> be immediately accessible as soon as one has a handle to a Node.

The libxml2dom.svg module has classes which inherit from EventTarget.
What I've tried to do is to make submodules to address particular
formats and document models.

> Furthermore, your code finds the bubbling route with the line:
>
> bubble_route = target.xpath("ancestor::*")
>
> That xpath method is a libxml method right?

I use libxml2's XPath support exposed via libxml2dom.Node.

> Indeed there is some vagueness in the W3C recommendations and the
> various documents offer very little redundancy with each other but
> require you to be knowledgeable about them all! I'm managing to piece
> together the pieces of the puzzle only after a couple of day having an
> in-depth read-through of DOM, DOM Events and a little bit of XML
> events to see how it all works in practice. XML events is also what's
> prompting me to think that Node/Elements classes of the implementation
> should also inherit from EventTarget as they can all be event
> targets.

I think that if I were to expose an event-capable DOM, other than that
provided for SVG, I would just have a specific submodule for that
purpose.

> > One of my tests tries to exercise the code, but I might be doing it
> > all completely wrong:
>
> >https://hg.boddie.org.uk/libxml2dom/file/91c0764ac7c6/tests/svg_event...
>
> Before I can comment I'd like to better understand what you are aiming
> for with libxml2dom. It seems to be providing some kind of conversion
> services from the xml structure generated by libxml to a dom-like
> structure (implemented by pxdom?).
> Is that correct?

Yes. The aim is to provide a PyXML DOM API on top of libxml2
documents.

Paul


From minesh at gmail.com  Fri May 15 14:09:18 2009
From: minesh at gmail.com (Minesh Patel)
Date: Fri, 15 May 2009 11:09:18 -0700
Subject: ConfigParser and newlines
Message-ID: <b804d5d90905151109j507cc974r8b3e40b225f0ccfa@mail.gmail.com>

I am using ConfigParser to parse a config file and I want to maintain
the newlines, how is it possible. Example given below. BTW, is there
an alternative to configParser, should I use 'exec' instead. Is there
any support for yaml built-in or possibly in the future?

test.cfg
============
[Foo_Section]

BODY = Line of text 1

   Continuing Line of text 1
============

Executing the code
===============
Python 2.5.1 Stackless 3.1b3 060516 (release25-maint, Mar  6 2009, 14:12:34)
[GCC 4.3.0 20080428 (Red Hat 4.3.0-8)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from ConfigParser import RawConfigParser
>>> config = RawConfigParser()
>>> config.read('test.cfg')
['test.cfg']
>>> config.get('Foo_Section', 'BODY')
'Line of text 1\nContinuing Line of text 1'
>>>
===============

I was expecting 'Line of text 1\n\nContinuing Line of text 1'
                                               ^^^^
with 2 newlines, how can I achieve that with ConfigParser.



-- 
Thanks,
./Minesh


From edd at nunswithguns.net  Fri May 15 14:09:45 2009
From: edd at nunswithguns.net (Edd)
Date: Fri, 15 May 2009 11:09:45 -0700 (PDT)
Subject: Appending traceback from exception in child thread
Message-ID: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>

Hi folks,

I have a some threadpool code that works like this :

    tp = ThreadPool(number_of_threads)
    futures = [tp.future(t) for t in tasks] # each task is callable
    for f in futures:
        print f.value() # <-- may propagate an exception

The idea being that a Future object represents a value that may or may
not have been computed yet and the .value() method will block until
that value is ready.

As the comment on the last line indicates, looking at the .value() of
a Future may give the return value of the associated task, or it may
also propagate an exception that was raised in a child thread.

Inside the implementation I store caught exceptions with code that
looks something like:

    try:
        self.return_value = self.task()
    except:
        self.exception = sys.exc_info()[1]

The problem I have is that when an exception is propagated in to the
parent thread by re-raising it, the part of the traceback from the
child thread is lost. So if the program dies due to such an exception,
I can't see what caused it by examining the printed traceback.

To solve this problem, I could of course grab the traceback in the
child thread and create some kind of custom exception that stashes the
trace inside. This could then be caught on the fringes of my code in
order to combine the tracebacks of parent and child together before
printing it. But I was wondering if there might be a nicer way that
keeps the original exception object. Perhaps something akin to gluing
the tracebacks together at the point where the exception is re-raised?

Kind regards,

Edd


From kyosohma at gmail.com  Fri May 15 14:38:16 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 15 May 2009 11:38:16 -0700 (PDT)
Subject: ConfigParser and newlines
References: <mailman.221.1242411274.8015.python-list@python.org>
Message-ID: <72a0ec11-68ee-4a96-84d8-1f23edd92bc5@r13g2000vbr.googlegroups.com>

On May 15, 1:09?pm, Minesh Patel <min... at gmail.com> wrote:
> I am using ConfigParser to parse a config file and I want to maintain
> the newlines, how is it possible. Example given below. BTW, is there
> an alternative to configParser, should I use 'exec' instead. Is there
> any support for yaml built-in or possibly in the future?
>

The primary alternative to ConfigParser is Michael Foord's ConfigObj:

http://www.voidspace.org.uk/python/configobj.html

I don't know if it has yaml support or not though.

Mike


From python.list at tim.thechases.com  Fri May 15 14:45:58 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 15 May 2009 13:45:58 -0500
Subject: ConfigParser and newlines
In-Reply-To: <b804d5d90905151109j507cc974r8b3e40b225f0ccfa@mail.gmail.com>
References: <b804d5d90905151109j507cc974r8b3e40b225f0ccfa@mail.gmail.com>
Message-ID: <4A0DB866.7090008@tim.thechases.com>

> test.cfg
> ============
> [Foo_Section]
> 
> BODY = Line of text 1
> 
>    Continuing Line of text 1
> ============
> 
> Executing the code
> ===============
> Python 2.5.1 Stackless 3.1b3 060516 (release25-maint, Mar  6 2009, 14:12:34)
> [GCC 4.3.0 20080428 (Red Hat 4.3.0-8)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> from ConfigParser import RawConfigParser
>>>> config = RawConfigParser()
>>>> config.read('test.cfg')
> ['test.cfg']
>>>> config.get('Foo_Section', 'BODY')
> 'Line of text 1\nContinuing Line of text 1'
> ===============
> 
> I was expecting 'Line of text 1\n\nContinuing Line of text 1'
>                                                ^^^^
> with 2 newlines, how can I achieve that with ConfigParser.

Not as best I can tell.  From my 
/usr/lib/python2.5/ConfigParser.py file, around line 441:

   if line[0].isspace() and cursect is not None and optname:
     value = line.strip()
     if value:
       cursect[optname] = "%s\n%s" % (cursect[optname], value)

That "value = line.strip()" is what's throwing away your extra 
newline.  Then the "if value" refuses to add the extra newline 
because it was a blank line.  It looks like this behavior was 
intentional?

-tkc








From arkanes at gmail.com  Fri May 15 14:57:59 2009
From: arkanes at gmail.com (Chris Mellon)
Date: Fri, 15 May 2009 13:57:59 -0500
Subject: Appending traceback from exception in child thread
In-Reply-To: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>
References: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>
Message-ID: <4866bea60905151157vfa328fxf4aa59ae1f4c5f5@mail.gmail.com>

On Fri, May 15, 2009 at 1:09 PM, Edd <edd at nunswithguns.net> wrote:
> Hi folks,
>
> I have a some threadpool code that works like this :
>
> ? ?tp = ThreadPool(number_of_threads)
> ? ?futures = [tp.future(t) for t in tasks] # each task is callable
> ? ?for f in futures:
> ? ? ? ?print f.value() # <-- may propagate an exception
>
> The idea being that a Future object represents a value that may or may
> not have been computed yet and the .value() method will block until
> that value is ready.
>
> As the comment on the last line indicates, looking at the .value() of
> a Future may give the return value of the associated task, or it may
> also propagate an exception that was raised in a child thread.
>
> Inside the implementation I store caught exceptions with code that
> looks something like:
>
> ? ?try:
> ? ? ? ?self.return_value = self.task()
> ? ?except:
> ? ? ? ?self.exception = sys.exc_info()[1]
>
> The problem I have is that when an exception is propagated in to the
> parent thread by re-raising it, the part of the traceback from the
> child thread is lost. So if the program dies due to such an exception,
> I can't see what caused it by examining the printed traceback.
>
> To solve this problem, I could of course grab the traceback in the
> child thread and create some kind of custom exception that stashes the
> trace inside. This could then be caught on the fringes of my code in
> order to combine the tracebacks of parent and child together before
> printing it. But I was wondering if there might be a nicer way that
> keeps the original exception object. Perhaps something akin to gluing
> the tracebacks together at the point where the exception is re-raised?
>
> Kind regards,
>
> Edd
> --
> http://mail.python.org/mailman/listinfo/python-list
>


Take a look at the Deferred and Failure objects from Twisted. Deferred
is a deferred result with callback (basically a Future without the
blocking interface), and Failure is an asynchronous exception object.


From kay at fiber-space.de  Fri May 15 15:31:36 2009
From: kay at fiber-space.de (kay at fiber-space.de)
Date: Fri, 15 May 2009 12:31:36 -0700 (PDT)
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
Message-ID: <bf5e536e-c2b5-4b0f-8977-1f9db0daa6e0@x6g2000vbg.googlegroups.com>

On 15 Mai, 18:12, xama... at yahoo.com wrote:
> How do you parse a string enclosed in Curly Braces?
>
> For instance:
>
> x = "{ABC EFG IJK LMN OPQ}"
>
> I want to do x.split('{} ') and it does not work. Why does it not work
> and what are EXCEPTIONS to using the split method?
>
> That I want to split based on '{', '}' and WHITESPACE.
>
> Please advise.
>
> Regards,
> Xav

import string
ttable   = string.maketrans("{} ", "\1\1\1")
print x.translate(ttable).split("\1")   # -> ['', 'ABC', 'EFG', 'IJK',
'LMN', 'OPQ', '']

The validity of the translation+split depends on the presence of \1 in
the original string of course.



From piet at cs.uu.nl  Fri May 15 15:32:47 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 15 May 2009 21:32:47 +0200
Subject: SOAPpy(10060, 'Operation timed out')
References: <mailman.5358.1241924170.11746.python-list@python.org>
Message-ID: <m21vqqgo0w.fsf@cs.uu.nl>

>>>>> "Zhang, Ning" <Ning.Zhang at centrica.com> (ZN) wrote:

>ZN> Hi all
>ZN> I am working for a energy company, we currently want to use api to load
>ZN> data into the database.

>ZN> I am new for soappy package. I have done a bit research on 
>ZN> http://www.ibm.com/developerworks/webse ... #resources
>ZN> <http://www.ibm.com/developerworks/webservices/library/ws-pyth16/#resour
>ces> 
>ZN> and
>ZN> http://www.diveintopython.org/soap_web_ ... gging.html
>ZN> <http://www.diveintopython.org/soap_web_services/debugging.html> 

>ZN> I can make none of the examples from tutorial correct.  

These examples often use short-lived services. When the tutorials are a
couple of years old, the sites disappear and the examples don't work. I
have given a course on distributed object systems the last years and
every few years I have to change the examples because they stop working.

>ZN> I have also tried the the example from Endolith posted last year.

>ZN> viewtopic.php?f=19&t=10038&p=45872&hilit=soap#p45872
>ZN> <http://www.python-forum.org/pythonforum/viewtopic.php?f=19&t=10038&p=45
>ZN> 872&hilit=soap#p45872> 

>ZN> Code: Select all
>ZN> <http://www.python-forum.org/pythonforum/viewtopic.php?f=5&t=12876##>  

>ZN> from SOAPpy import WSDL

>ZN> wsdl_file = 'http://xurrency.com/api.wsdl'
>ZN> server = WSDL.Proxy(wsdl_file)
>ZN> values = server.getValuesInverse('usd')

>ZN> However, I got the error message below:  

>ZN> error: (10060, 'Operation timed out')

This works for me. Could it be that the xurrency.com site was
temporarily down? Or that your company's firewall blocks SOAP calls?
maybe you should ask your network manager.

I used this example in my last lectures and it worked also today:

from SOAPpy import SOAPProxy
url = "http://xurrency.com/servidor_soap.php"
namespace = "http://xurrency.com/api.wsdl"
server = SOAPProxy(url, namespace)
server.config.dumpSOAPOut = True
server.config.dumpSOAPIn = True
print server.getValue(100,"eur","usd")

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From tjreedy at udel.edu  Fri May 15 15:34:38 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 15 May 2009 15:34:38 -0400
Subject: How to catch str exception?
In-Reply-To: <86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
Message-ID: <gukg4d$kb2$2@ger.gmane.org>

anuraguniyal at yahoo.com wrote:
> but the whole point of catching such exception is that i can print its
> value
> there are many such exceptions and hence it is not feasible to catch
> them all or know them all unless i go thru src code.

I think you have discovered why they are gone in Py3 ;-).




From trevor.lango at gmail.com  Fri May 15 15:39:41 2009
From: trevor.lango at gmail.com (Trevor)
Date: Fri, 15 May 2009 12:39:41 -0700 (PDT)
Subject: Tkinter Window On Top
Message-ID: <d5ce72b6-f1f7-42fb-b80e-9f65a6a3a39a@18g2000prx.googlegroups.com>

Can a Tkinter application create a COM object and keep its own window
on top of it?

excel = win32com.client.Dispatch('Excel.Application')

I would like the user to be able to see and interact with the Excel
application but keep the Tkinter application on top.


From tjreedy at udel.edu  Fri May 15 15:59:35 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 15 May 2009 15:59:35 -0400
Subject: Finding location of an executable in a windows machine?
In-Reply-To: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>
References: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>
Message-ID: <gukhj8$p1h$1@ger.gmane.org>

nonsense at mynonsense.net wrote:
> My python script calls another windows program file. I have the path
> to that program hardcoded in it. Is there a way for python to
> automatically find the path to this program?
> 
> testapp_path = "C:\\Program Files\\testapp\\version\\61\\"
> 
> Or do i have to do a brute force approach to searching all drives/
> folders till it finds a path matching my program name?

Program Files directories are usually not part of the PATH environment 
variable.  A main program in Program Files is generally started by 
clicking on: an icon that points to it, an entry in Start Menu, its 
directory listing in Explorer, or a file whose extension is associated 
with it.  A subsidiary program is started by a main program that knows 
where is it in relation to the main program.

If a program is registered when installed, then there will be a registry 
key that is the same for all installations that points to its 
installation-specific location.  Python on Windows comes with a winreg 
module for accessing the registry.  You just need to find the key, 
possibly using the regedit utility and its search function.

Terry Jan Reedy



From __peter__ at web.de  Fri May 15 16:01:18 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 15 May 2009 22:01:18 +0200
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
	<bf5e536e-c2b5-4b0f-8977-1f9db0daa6e0@x6g2000vbg.googlegroups.com>
Message-ID: <gukhm3$flj$02$1@news.t-online.com>

kay at fiber-space.de wrote:

> ttable   = string.maketrans("{} ", "\1\1\1")
> print x.translate(ttable).split("\1")   # -> ['', 'ABC', 'EFG', 'IJK',
> 'LMN', 'OPQ', '']
> 
> The validity of the translation+split depends on the presence of \1 in
> the original string of course.

Keep one of the splitting characters to avoid that (theoretical) risk:

ttable = string.maketrans("{} ", "{{{")

Peter



From http  Fri May 15 16:36:26 2009
From: http (Paul Rubin)
Date: 15 May 2009 13:36:26 -0700
Subject: How to catch str exception?
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
Message-ID: <7xeiuqkss5.fsf@ruckus.brouhaha.com>

"anuraguniyal at yahoo.com" <anuraguniyal at yahoo.com> writes:
> there are many such exceptions and hence it is not feasible to catch
> them all or know them all unless i go thru src code.

But that is true of all exceptions.  The alternative seems to be a
"checked exception" scheme like Java's, which in practice imposes a
huge pain on programmers, who have to modify type signatures all up
and down the call hierarchy every time they raise another exception at
the bottom level.


From google at mrabarnett.plus.com  Fri May 15 16:50:12 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 15 May 2009 21:50:12 +0100
Subject: How to catch str exception?
In-Reply-To: <7xeiuqkss5.fsf@ruckus.brouhaha.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>	<mailman.187.1242377429.8015.python-list@python.org>	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
	<7xeiuqkss5.fsf@ruckus.brouhaha.com>
Message-ID: <4A0DD584.7080800@mrabarnett.plus.com>

Paul Rubin wrote:
> "anuraguniyal at yahoo.com" <anuraguniyal at yahoo.com> writes:
>> there are many such exceptions and hence it is not feasible to catch
>> them all or know them all unless i go thru src code.
> 
> But that is true of all exceptions.  The alternative seems to be a
> "checked exception" scheme like Java's, which in practice imposes a
> huge pain on programmers, who have to modify type signatures all up
> and down the call hierarchy every time they raise another exception at
> the bottom level.

I would've thought that a modern IDE would do a lot of the work for you.


From eye.zak.devel at gmail.com  Fri May 15 16:58:55 2009
From: eye.zak.devel at gmail.com (eye zak)
Date: Fri, 15 May 2009 16:58:55 -0400
Subject: How do i generate a tuple from a generator ?
Message-ID: <e9465b660905151358o1e0d15d3ve8dc447f634f98b@mail.gmail.com>

Hi,

I have a situation where i want a tuple from a generator/sequence
comprehension.
I am wondering, is this possible ? or is this just a bad idea all together?

class iterator(object):
    __slots__ = ('__iters',)

    def __init__(self,*args):
        assert len(args) != 0
        self.__iters = tuple( __builtins__.iter(arg) for arg in args )

    def __iter__(self,*args):
        return self

    def next(self):
        return [ i.next() for i in self.__iters ]    # HERE I WANT A TUPLE

This can also be accomplished with a generator function, but requires
while True loop. is that better ?

Isaac


From emile at fenx.com  Fri May 15 17:03:31 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 15 May 2009 14:03:31 -0700
Subject: How do i generate a tuple from a generator ?
In-Reply-To: <e9465b660905151358o1e0d15d3ve8dc447f634f98b@mail.gmail.com>
References: <e9465b660905151358o1e0d15d3ve8dc447f634f98b@mail.gmail.com>
Message-ID: <guklb9$475$1@ger.gmane.org>

On 5/15/2009 1:58 PM eye zak said...
> Hi,
> 
> I have a situation where i want a tuple from a generator/sequence
> comprehension.
> I am wondering, is this possible ? or is this just a bad idea all together?
> 
> class iterator(object):
>     __slots__ = ('__iters',)
> 
>     def __init__(self,*args):
>         assert len(args) != 0
>         self.__iters = tuple( __builtins__.iter(arg) for arg in args )
> 
>     def __iter__(self,*args):
>         return self
> 
>     def next(self):
>         return [ i.next() for i in self.__iters ]    # HERE I WANT A TUPLE
           return tuple(...)
Emile

> 
> This can also be accomplished with a generator function, but requires
> while True loop. is that better ?
> 
> Isaac



From norseman at hughes.net  Fri May 15 17:17:36 2009
From: norseman at hughes.net (norseman)
Date: Fri, 15 May 2009 14:17:36 -0700
Subject: Just wondering
In-Reply-To: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>
References: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>
Message-ID: <4A0DDBF0.6030709@hughes.net>

Gediminas Kregzde wrote:
> Hello,
> 
> I'm Vilnius college II degree student and last semester our teacher
> introduced us to python
> I've used to program with Delphi, so I very fast adopted to python
> 
> Now I'm developing cross platform program and use huge amounts of
> data. Program is needed to run as fast as it coud. I've read all tips
> about geting performance, but got 1 bug: map function is slower than
> for loop for about 5 times, when using huge amounts of data.
> It is needed to perform some operations, not to return data.
> 
> I'm adding sample code:
> from time import time
> 
> def doit(i):
>    pass
> 
> def main():
>    a = [0] * 10000000
>    t = time()
>    map(doit, a)
>    print "map time: " + str(time() - t)
> 
> def main2():
>    t = time()
>    a = [0] * 10000000
>    for i in a:
>        pass
>    print "loop time: " + str(time() - t)
> 
> main()  # takes approximately 5x times longer than main2()
> main2()
> 
> I'm wondering were is catch?
> 
> I'm using python 2.6 on windows xp sp2 machine
> 
> P.S. Sorry for my broken English
===============================

cut n paste done


Using Laptop at 2.4 GHz
map time:  4.9281001091               map/loop = 5.7554...
loop time: 0.856245994568

Using Desktop at 3.1 GHz
map time: 3.46799993515               map/loop = 7.6556...
loop time: 0.453000068665


Yep - map is way slower

Your English is good enough for me to understand. What more is needed?
:)

Someone writing Python can probably say why.

Steve



From norseman at hughes.net  Fri May 15 17:20:40 2009
From: norseman at hughes.net (norseman)
Date: Fri, 15 May 2009 14:20:40 -0700
Subject: Just wondering
In-Reply-To: <Q6dPl.15964$Ux.11735@tornado.fastwebnet.it>
References: <mailman.188.1242388571.8015.python-list@python.org>
	<Q6dPl.15964$Ux.11735@tornado.fastwebnet.it>
Message-ID: <4A0DDCA8.3020806@hughes.net>

Marco Mariani wrote:
> Gediminas Kregzde wrote:
> 
> 
>> def doit(i):
>>    pass
>>
>> def main():
>>    a = [0] * 10000000
>>    t = time()
>>    map(doit, a)
>>    print "map time: " + str(time() - t)
> 
> Here you are calling a function ten million times, build a list with of 
> ten million None results, then throw it away.
> 
> 
>> def main2():
>>    t = time()
>>    a = [0] * 10000000
>>    for i in a:
>>        pass
>>    print "loop time: " + str(time() - t)
> 
> Here you do nothing but iterating 'i' over the 'a' list.
> 
> 
>> main()  # takes approximately 5x times longer than main2()
>> main2()
>>
>> I'm wondering were is catch?
> 
> Function calls are not free in python. They cost a lot more than they do 
> in C, Delphi or other languages.
> 

Gediminas - You did a good job of testing the overhead.  All good 
programmers do that!

Steve


From minesh at gmail.com  Fri May 15 17:31:35 2009
From: minesh at gmail.com (Minesh Patel)
Date: Fri, 15 May 2009 14:31:35 -0700
Subject: ConfigParser and newlines
In-Reply-To: <4A0DB866.7090008@tim.thechases.com>
References: <b804d5d90905151109j507cc974r8b3e40b225f0ccfa@mail.gmail.com>
	<4A0DB866.7090008@tim.thechases.com>
Message-ID: <b804d5d90905151431y75db4320p60cd3798dd245493@mail.gmail.com>

> Not as best I can tell. ?From my /usr/lib/python2.5/ConfigParser.py file,
> around line 441:
>
> ?if line[0].isspace() and cursect is not None and optname:
> ? ?value = line.strip()
> ? ?if value:
> ? ? ?cursect[optname] = "%s\n%s" % (cursect[optname], value)
>
> That "value = line.strip()" is what's throwing away your extra newline.
> ?Then the "if value" refuses to add the extra newline because it was a blank
> line. ?It looks like this behavior was intentional?
>

Is that a bug? What would be the use cases for stripping newlines
unnecessarily. Seems like the configParser is trying to be too clever.

-- 
Thanks,
./Minesh


From ebonak at hotmail.com  Fri May 15 17:32:57 2009
From: ebonak at hotmail.com (Esmail)
Date: Fri, 15 May 2009 17:32:57 -0400
Subject: ConfigParser examples?
Message-ID: <gukn24$a47$1@ger.gmane.org>

Hi all,

Can anyone point to on the web, or possibly share a simple example
of the use of the ConfigParser module?

I have a program that has a lot of flags in various places (yes,
ugly I know), so I am trying to consolidate this information in
a configuration file so that the program can pull the necessary
information from this place without the need to edit the program
and its flags.

Some sample code for using ConfigParser would be helpful - haven't
been able to find any on-line so far beyond the standard documentation.

Thanks,
Esmail



From sjmachin at lexicon.net  Fri May 15 17:58:41 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 15 May 2009 14:58:41 -0700 (PDT)
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
	<50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com> 
	<mailman.216.1242408349.8015.python-list@python.org>
Message-ID: <180531ca-33aa-47b9-9c69-5b5973f6b6f9@v35g2000pro.googlegroups.com>

On May 16, 3:25?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> Chris Rebert wrote:
> > On Fri, May 15, 2009 at 9:12 AM, ?<xama... at yahoo.com> wrote:
> >> How do you parse a string enclosed in Curly Braces?
>
> >> For instance:
>
> >> x = "{ABC EFG IJK LMN OPQ}"
>
> >> I want to do x.split('{} ') and it does not work. Why does it not work
> >> and what are EXCEPTIONS to using the split method?
>
> > .split() takes a *substring* to split on, *not* a set of individual
> > characters to split on. Read the Fine Docs.
>
> >> That I want to split based on '{', '}' and WHITESPACE.
>
> > Well, you could use a regex, or you could just .find() where the
> > braces are, slice them off the ends of the string, and then split the
> > result on space.
>
> Here's a function which splits on multiple characters:
>
> def split_many(string, delimiters):
> ? ? ?parts = [string]
> ? ? ?for d in delimiters:
> ? ? ? ? ?parts = sum((p.split(d) for p in parts), [])
> ? ? ?return parts

Neat trick. However, from 2.6.2:

>>> help(sum)
Help on built-in function sum in module __builtin__:

sum(...)
    sum(sequence[, start]) -> value

    Returns the sum of a sequence of numbers (NOT strings) plus the
value
    of parameter 'start' (which defaults to 0).  When the sequence is
    empty, returns start.

Since when is a list a number? Perhaps the help needs clarification,
in line with the docs.

Cheers,
John


From cs at zip.com.au  Fri May 15 17:59:05 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Sat, 16 May 2009 07:59:05 +1000
Subject: How to catch str exception?
In-Reply-To: <7xeiuqkss5.fsf@ruckus.brouhaha.com>
Message-ID: <20090515215905.GA823@cskk.homeip.net>

On 15May2009 13:36,  <> wrote:
| "anuraguniyal at yahoo.com" <anuraguniyal at yahoo.com> writes:
| > there are many such exceptions and hence it is not feasible to catch
| > them all or know them all unless i go thru src code.
| 
| But that is true of all exceptions.  The alternative seems to be a
| "checked exception" scheme like Java's, which in practice imposes a
| huge pain on programmers, who have to modify type signatures all up
| and down the call hierarchy every time they raise another exception at
| the bottom level.

I used to think that too, but it's not entirely true.

Aside: I loved the discipline that comes with Java's interface strictness
but found the language felt cumbersome; Python's duck typing approach
is far simpler to work with but lets you be a lot sloppier because many
implementation shortcomings will only show at runtime, whereas Java's
rigidity can be used to catch a lot of stuff at compile time.

Anyway, to the exception thing: if you're throwing a "new" type of
exception then either you've changes the object model and Java rightly
complains, if you're breaking the object encapsulation and you should
be catching the new exceptions fairly low down and either handling it or
raising a "conformant" exception the caller expected. This isually happens
across a type boundary; for example a data structure that just happens to
use an SQL db for backing structure should be catching any SQL exceptions
and recasting them to an appropriate outer exception for the user,
probably inserting the underlying SQL exception into the new exception
as an attribute.

Anyway, my basic point here is that the asserting that your have to
"modify type signatures all up and down the call hierarchy every time they
raise another exception" should have a fairly limited scope. Unexpected
exceptions _shouldn't_ be happening. We routinely write stuff like:

  try:
    n = int(foo)
  except ValueError, e:
    print >>sys.stderr, "not an integer: %s" % foo

If int() starts throwing non-ValueError exceptions then many many
programs break. Java would prevent one from changing int() in such
a fashion outright. Python requires the self-discipline on the part of
the implementer of int() to raise only ValueError exceptions, and
internally handle anything else at a lower level.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Widget. It's got a widget. A lovely widget. A widget it has got.
        - Jack Dee


From DustanGroups at gmail.com  Fri May 15 17:59:12 2009
From: DustanGroups at gmail.com (Dustan)
Date: Fri, 15 May 2009 14:59:12 -0700 (PDT)
Subject: Photoimage on button appears pixelated when button is disabled
Message-ID: <fb96adf5-28cd-4493-8070-993f30f1d78e@v4g2000vba.googlegroups.com>

In tkinter, when I place a photoimage on a button and disable the
button, the image has background dots scattered through the image.
Searching the web, I wasn't able to find any documentation on this
behavior, nor how to turn it off. So here I am. How do I keep this
from happening?

Also, how can I extract the base-64 encoding of a GIF, so I can put
the image directly into the code instead of having to keep a separate
file for the image?

All responses appreciated,
Dustan


From rhodri at wildebst.demon.co.uk  Fri May 15 18:01:27 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 15 May 2009 23:01:27 +0100
Subject: How to catch str exception?
In-Reply-To: <62c75d3a-fe31-4b91-b493-58f2d53c105a@k19g2000prh.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
	<gujdm7$cip$01$1@news.t-online.com>
	<62c75d3a-fe31-4b91-b493-58f2d53c105a@k19g2000prh.googlegroups.com>
Message-ID: <op.utzrgpuma8ncjz@gnudebst>

On Fri, 15 May 2009 12:50:59 +0100, anuraguniyal at yahoo.com  
<anuraguniyal at yahoo.com> wrote:

>
>> try:
>> ? ? raise "abc"
>> except:
>> ? ? e, t, tb = sys.exc_info()
>> ? ? if not isinstance(e, str):
>> ? ? ? ? raise
>> ? ? print "caught", e
>
> This seems to be the solution, thanks

Do be aware that string exceptions are going away, so at
some point you're going to upgrade your version of Python
and your scripts will mysteriously stop working.  Peter's
patch will help you for now, but it's a double-edged sword
in that it also lets you pretend that you don't have to
fix the problem properly later.  In my experience it's
generally best to fix the problem now rather than paper
over the cracks.

Since this is a third-party library doing this, as far as
I can see it you have three choices:

1) Get hold of a more up-to-date version of the module,
if there is one.

2) Ask the module writers nicely to fix the problem.

3) Fix it yourself.

The beauty of Python is that 3) isn't all that hard!

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From socyl at 987jk.com.invalid  Fri May 15 18:12:06 2009
From: socyl at 987jk.com.invalid (kj)
Date: Fri, 15 May 2009 22:12:06 +0000 (UTC)
Subject: How to get the formal args of a function object?
References: <guhrjb$79i$1@reader1.panix.com>
	<mailman.162.1242334673.8015.python-list@python.org>
Message-ID: <gukpbm$sbh$1@reader1.panix.com>

In <mailman.162.1242334673.8015.python-list at python.org> Chris Rebert <clp2 at rebertia.com> writes:

>Take a look at inspect.getargspec(func):
>http://docs.python.org/library/inspect.html#inspect.getargspec

Thank you much, that did the trick.  And inspect is a very handy
module to know about.

kynn
-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From rhodri at wildebst.demon.co.uk  Fri May 15 18:18:14 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 15 May 2009 23:18:14 +0100
Subject: Parsing Strings in Enclosed in Curly Braces
In-Reply-To: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
Message-ID: <op.utzr8od5a8ncjz@gnudebst>

On Fri, 15 May 2009 17:12:24 +0100, <xamalek at yahoo.com> wrote:

> How do you parse a string enclosed in Curly Braces?
>
> For instance:
>
> x = "{ABC EFG IJK LMN OPQ}"
>
> I want to do x.split('{} ') and it does not work. Why does it not work
> and what are EXCEPTIONS to using the split method?

Other people have already done this bit :-)

> That I want to split based on '{', '}' and WHITESPACE.

This is not the same as what you first said, and I have a horrid feeling
you're trying to conflate two steps into one.  That way lies madness.

First, a question.  Is 'x' truly a good representation of your original
data?  Could it instead look more like:

x = "Ignore this {but not this} and completely forget about this"

Can you have braces legitmately lying around in the string, escaped
somehow:

x = r"{Parse including the \} escaped close brace}"

Can you have nested braces, and what are you supposed to do with them:

x = "{Some text to parse {as well as an aside} and so on}"

Parsing is not an entirely trivial subject, particularly when users
can futz about with the strings you're parsing.  That's one reason there
are so many lexers and parsers out there!

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From socyl at 987jk.com.invalid  Fri May 15 18:20:41 2009
From: socyl at 987jk.com.invalid (kj)
Date: Fri, 15 May 2009 22:20:41 +0000 (UTC)
Subject: Need advice on distributing small module
References: <guhuqf$h3u$1@reader1.panix.com>
	<99246143-a853-4041-bc45-eeb648388cc4@r3g2000vbp.googlegroups.com>
Message-ID: <gukprp$kf3$1@reader1.panix.com>

In <99246143-a853-4041-bc45-eeb648388cc4 at r3g2000vbp.googlegroups.com> Carl Banks <pavlovevidence at gmail.com> writes:

>On May 14, 1:26=A0pm, kj <so... at 987jk.com.invalid> wrote:
>> I've written a tiny module that I'd like to make available online
>> from my website. =A0This module is not "production-grade" code; it
>> is meant only as an illustration, but still I'd like to make its
>> download and installation as painless as possible.
>>
>> I could simply bundle everything into a .tgz file, but I'd like
>> the distribution to conform to the expectations of Python users,
>> as far as the installation sequence is concerned. =A0I'm fairly new
>> to Python, and would appreciate your advice on this last point.

>First of all, if it's just a single module, I recommend that one of
>the options is to allow the file to be downloaded as-is, with no
>packaging, because a lot of Python users would find it least
>cumbersome to simply drop the file right into the site-packages
>directory.  The README file would be a separate download or just a
>page on the website.

>For more official-looking packages, you want to create a setup.py file
>that lists your module's build information and meta-information.  Read
>the section of the Python documentation entitled "Distributing Python
>Modules" for information on how to write a setup file.  Once you write
>it, you can run python setup.py sdist and it'll build a distrribution
>for you.


>> The module has only one non-standard dependency, described by the
>> following code:
>>
>> if sys.version_info[:2] >=3D (2, 6):
>> =A0 =A0 import json
>> else:
>> =A0 =A0 import simplejson as json
>>
>> If possible, I'd like to make distribution procedure such that if
>> necessary it also installs json or simplejson (as the case may be).

>Next recommendation: just tell your users to download and install json
>if they want to use the module.  A small demo module shouldn't be
>taking the initiative to install a fairly large package on the user's
>behalf.

>Furthermore, some users have extreme hatred for software that
>"helpfully" downloads and installs other packages without asking
>first.

>If you want to proceed along these lines in spite of this, the way to
>do it is to add some information to setup.py that lists dependencies.
>There is a script, easy_install.py, that uses this information to
>install dependencies automatically.  However, I don't know the details
>of how to do that.


Thanks, that's very useful advice.

kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From sridharr at activestate.com  Fri May 15 18:28:49 2009
From: sridharr at activestate.com (Sridhar Ratnakumar)
Date: Fri, 15 May 2009 15:28:49 -0700
Subject: ANN: ActivePython 2.6.2.2, 3.1.0b1.0, 2.5.4.4 is now available
Message-ID: <4A0DECA1.1090002@activestate.com>

I'm happy to announce that ActivePython 2.6.2.2, 3.1.0b1.0 and 2.5.4.4
are now available for download from:

     http://www.activestate.com/activepython/

This is a patch release that updates ActivePython to core Python 2.6.2
and 3.1b2.  This release also contains updates to Tcl/Tk 8.5.7 and Tix
8.4.3. We recommend that you try 2.6 version first. See the release
notes for full details:

     http://docs.activestate.com/activepython/2.6/relnotes.html


What is ActivePython?
---------------------

ActivePython is ActiveState's binary distribution of Python. Builds
for Windows, Mac OS X, Linux, HP-UX and AIX are made freely available.

ActivePython includes the Python core and the many core extensions:
zlib and bzip2 for data compression, the Berkeley DB (bsddb) and
SQLite (sqlite3) database libraries, OpenSSL bindings for HTTPS
support, the Tix GUI widgets for Tkinter, ElementTree for XML
processing, ctypes (on supported platforms) for low-level library
access, and others. The Windows distribution ships with PyWin32 -- a
suite of Windows tools developed by Mark Hammond, including bindings
to the Win32 API and Windows COM. See this page for full details:

     http://docs.activestate.com/activepython/2.6/whatsincluded.html

As well, ActivePython ships with a wealth of documentation for both
new and experienced Python programmers. In addition to the core Python
docs, ActivePython includes the "What's New in Python" series, "Dive
into Python", the Python FAQs & HOWTOs, and the Python Enhancement
Proposals (PEPs).

An online version of the docs can be found here:

     http://docs.activestate.com/activepython/2.6/

We would welcome any and all feedback to:

     ActivePython-feedback at activestate.com

Please file bugs against ActivePython at:

     http://bugs.activestate.com/query.cgi?set_product=ActivePython


On what platforms does ActivePython run?
----------------------------------------

ActivePython includes installers for the following platforms:

- Windows/x86
- Windows/x64 (aka "AMD64")
- Mac OS X
- Linux/x86
- Linux/x86_64 (aka "AMD64")
- Solaris/SPARC
- Solaris/x86
- HP-UX/PA-RISC
- AIX/PowerPC


Extra Bits
----------

ActivePython releases also include the following:

- ActivePython26.chm: An MS compiled help collection of the full
   ActivePython documentation set. Linux users of applications such as
   xCHM might find this useful. This package is installed by default on
   Windows.

Extra bits are available from:

     http://downloads.activestate.com/ActivePython/etc/
	

Thanks, and enjoy!

The Python Team

--
Sridhar Ratnakumar
sridharr at activestate.com


From rhodri at wildebst.demon.co.uk  Fri May 15 18:39:26 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 15 May 2009 23:39:26 +0100
Subject: python
In-Reply-To: <629cf901-516f-4888-90c5-d6174bdf9b5e@r3g2000vbp.googlegroups.com>
References: <629cf901-516f-4888-90c5-d6174bdf9b5e@r3g2000vbp.googlegroups.com>
Message-ID: <op.utzs70qaa8ncjz@gnudebst>

On Fri, 15 May 2009 14:58:16 +0100, <anica_1069 at hotmail.com> wrote:

> hello, I?m a student of linguistic an I need do this exercises. Can
> anybody help me,please?
> Thanks

Sorry, we're allergic to homework.  If you've got any more specific
questions about how bits of Python work, do ask, but don't ask us to
do your assignments for you.  Most tutors can get downright unreasonable
about that sort of thing.

> ? Read in some text from a corpus, tokenize it, and print the list of
> all wh-word types that occur. (wh-words in English are used in
> questions, relative clauses and exclamations: who, which, what, and so
> on.) Print them in order. Are any words duplicated in this list,
> because of the presence of case distinctions or punctuation?

Some questions you should already have the answers to:

* How do you identify wh-words?  I'm guessing for the purposes of
this assignment you've got a list of them.  If that's so, look up the
bit of the tutorial about finding out whether something is in a list.
If you have to parse for them, that's a rather harder problem.

* ...but beware of case distinctions -- look up the string methods to
see how to play with the case of a string.

* Tokenizing the string is just a matter of splitting it up where there
are spaces or punctuation.  Funnily enough, there's this string method
called "split()" that will do this.

* What does "in order" mean?  In the order in which they occur in the
corpus?  In alphabetical order?  If it's the latter, you'll need to
record the wh-words when they occur in a list and sort it at the end
before printing it out.

> ? Create a file consisting of words and (made up) frequencies, where
> each line consists of a word, the space character, and a positive
> integer, e.g. fuzzy 53. Read the file into a Python list using open
> (filename).readlines(). Next, break each line into its two fields
> using split(), and convert the number into an integer using int(). The
> result should be a list of the form: [['fuzzy', 53], ...].

So you do that.  Seriously, this is a pretty complete recipe already.
If you can't see how to do it, re-read the tutorial.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From martin at v.loewis.de  Fri May 15 18:50:53 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 16 May 2009 00:50:53 +0200
Subject: Configure options for minimal Python 2.6
In-Reply-To: <mailman.192.1242390533.8015.python-list@python.org>
References: <mailman.192.1242390533.8015.python-list@python.org>
Message-ID: <4a0df1cd$0$24061$9b622d9e@news.freenet.de>

> I want to compile a minimal Python 2.6 for Debian Etch without support
> for optional features such as tk and sphinx.  The configure script's
> help says that features can be disabled with an '--without-PACKAGE', so
> I guess disabling tk is '--without-tk', but where is there a list of the
> feature/package names of the other optional components?

To disable extension modules, there is actually nothing that you have to
do. By default, they will not get compiled into the interpreter, anyway.

A few modules to become builtin; check Modules/Setup* to remove any that
you don't want.

configure --help gives you a complete list of all supported parameters
already.

Regards,
Martin


From davea at ieee.org  Fri May 15 19:54:40 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 19:54:40 -0400
Subject: Just wondering
In-Reply-To: <4A0DDCA8.3020806@hughes.net>
References: <mailman.188.1242388571.8015.python-list@python.org>	<Q6dPl.15964$Ux.11735@tornado.fastwebnet.it>
	<4A0DDCA8.3020806@hughes.net>
Message-ID: <4A0E00C0.7090908@ieee.org>

norseman wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">Marco 
> Mariani wrote:
>> Gediminas Kregzde wrote:
>>
>>
>>> def doit(i):
>>>    pass
>>>
>>> def main():
>>>    a = [0] * 10000000
>>>    t = time()
>>>    map(doit, a)
>>>    print "map time: " + str(time() - t)
>>
>> Here you are calling a function ten million times, build a list with 
>> of ten million None results, then throw it away.
>>
>>
>>> def main2():
>>>    t = time()
>>>    a = [0] * 10000000
>>>    for i in a:
>>>        pass
>>>    print "loop time: " + str(time() - t)
>>
>> Here you do nothing but iterating 'i' over the 'a' list.
>>
>>
>>> main()  # takes approximately 5x times longer than main2()
>>> main2()
>>>
>>> I'm wondering were is catch?
>>
>> Function calls are not free in python. They cost a lot more than they 
>> do in C, Delphi or other languages.
>>
>
> Gediminas - You did a good job of testing the overhead.  All good 
> programmers do that!
>
> Steve
>
>
If the task is to test the overhead, then the two loops need to be 
equivalent.  The OP's conclusion, confirmed by many of you, is that 
map() is lots slower than for.  But if you add in the call overhead in 
the for loop, they come out within 2 percent.  If you just want to 
compare map() time to for time, use functions:

from time import time
def doit(i):
   pass
def main():
   a = [0] * 10000000
   t = time()
   map(doit, a)
   print "map time: " + str(time() - t)

def main2():
   a = [0] * 10000000
   t = time()
   for i in a:
       doit(i)
   print "loop time: " + str(time() - t)


main()
main2()

gives:
map time: 4.875
loop time: 4.79600000381



From gagsl-py2 at yahoo.com.ar  Fri May 15 20:01:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 15 May 2009 21:01:41 -0300
Subject: KeyboardInterrupt catch does not shut down the socketserver
References: <mailman.183.1242371089.8015.python-list@python.org>
	<guj8dv$5sl$2@lust.ihug.co.nz>
	<mailman.185.1242375959.8015.python-list@python.org>
	<gujl41$d0r$2@lust.ihug.co.nz> <4A0D5A35.3010008@gmail.com>
Message-ID: <op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 09:04:05 -0300, Igor Katson escribi?:
> Lawrence D'Oliveiro wrote:
>> In message <mailman.185.1242375959.8015.python-list at python.org>, Igor  
>> Katson wrote:
>>> Lawrence D'Oliveiro wrote:
>>>> In message <mailman.183.1242371089.8015.python-list at python.org>, Igor  
>>>> Katson wrote:
>>>>
>>>>> I have problems in getting a SocketServer to shutdown.
>>>>>
>>>> Do you want to do a shutdown or a close?
>>>>
>>> I want the server close the socket ...
>>>
>>
>> You want to do a close, do a close, not a shutdown  
>> <http://docs.python.org/library/socket.html>.
>>
> Shutdown implies closing the listening socket, doesn't it?

No (perhaps it should, but that is another issue). There is a
documentation bug; BaseServer.shutdown is documented as "Tells the
serve_forever() loop to stop and waits until it does." [1]
The docstring is much more explicit: """Stops the serve_forever loop.
Blocks until the loop has finished. This must be called while
serve_forever() is running in another thread, or it will deadlock."""

So, if you have a single-threaded server, *don't* use shutdown(). And, to
orderly close the listening socket, use server_close() instead. Your code
would become:

    from SocketServer import TCPServer, BaseRequestHandler

server = TCPServer(('localhost',1234), BaseRequestHandler)
try:
       server.serve_forever()
except KeyboardInterrupt:
       print "^C detected"
       pass
finally:
       print "server_close()"
       server.server_close()
print "bye"

(I've opened http://bugs.python.org/issue6031 )

[1]
http://docs.python.org/dev/library/socketserver.html?highlight=baseserver#SocketServer.BaseServer.shutdown

-- 
Gabriel Genellina



From sam at tregar.com  Fri May 15 21:17:43 2009
From: sam at tregar.com (Sam Tregar)
Date: Fri, 15 May 2009 21:17:43 -0400
Subject: Difference between list() and [] with dictionaries
Message-ID: <fe3354e50905151817ie4df792hebec03ae42eca25c@mail.gmail.com>

Hello all.  Can anyone explain why this creates a list containing a
dictionary:

  [{'a': 'b', 'foo': 'bar'}]

But this creates a list of keys of the dictionary:

  list({ "a": "b", "foo": "bar" })

I expected them to be equivalent but clearly they're not!  I'm using Python
2.6.1 if that helps.

-sam
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From gagsl-py2 at yahoo.com.ar  Fri May 15 21:25:45 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 15 May 2009 22:25:45 -0300
Subject: Tkinter Window On Top
References: <d5ce72b6-f1f7-42fb-b80e-9f65a6a3a39a@18g2000prx.googlegroups.com>
Message-ID: <op.utz0w7ptx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 16:39:41 -0300, Trevor <trevor.lango at gmail.com>  
escribi?:

> Can a Tkinter application create a COM object and keep its own window
> on top of it?
>
> excel = win32com.client.Dispatch('Excel.Application')
>
> I would like the user to be able to see and interact with the Excel
> application but keep the Tkinter application on top.

I don't know how to do that directly with tk, but I'd use the SetWindowPos  
function: http://msdn.microsoft.com/en-us/library/ms632673(VS.85).aspx
The tricky part is to get the right hwnd, this seems to work:

>>> root = Tkinter.Tk()
>>> hwnd = int(root.wm_frame(),0)
>>> win32gui.SetWindowPos(hwnd,
...   win32con.HWND_TOPMOST,
...   0,0,0,0,
...   win32con.SWP_NOMOVE | win32con.SWP_NOSIZE)

-- 
Gabriel Genellina



From nagle at animats.com  Fri May 15 21:28:20 2009
From: nagle at animats.com (John Nagle)
Date: Fri, 15 May 2009 18:28:20 -0700
Subject: Annoying feedparser issues
Message-ID: <4a0e0daf$0$1645$742ec2ed@news.sonic.net>

     This really isn't the fault of the "feedparser" module, but it's
worth mentioning.

     I have an application which needs to read each new item from a feed
as it shows up, as efficiently as possible, because it's monitoring multiple
feeds.  I want exactly one copy of each item as it comes in.

     In theory, this is easy.  Each time the feed is polled, pass in the
timestamp and ID from the previous poll, and if nothing has changed,
a 304 status should come back.

     Results are spotty.  It mostly works for Reuters.  It doesn't work
for Twitter at all; Twitter updates the timestamp even when nothing changes.
So items are routinely re-read.  (That has to be costing Twitter a huge
amount of bandwidth from useless polls.)

     Some sites have changing feed etags because they're using multiple
servers and a load balancer. These can be recognized because the same
etags will show up again after a change.

     Items can supposedly be unduplicated by using the "etag" value.
This almost works, but it's tricker than one might think.  On some feeds,
an item might go away, yet come back in a later feed.  This happens with
news feeds from major news sources, because they have priorities that
don't show up in RSS.  High priority stories might push a low priority story
off the feed, but it may come back later.  Also, every night at 00:00, some
feeds like Reuters re-number everything.  The only thing that works reliably
is comparing the story text.

					John Nagle


From gagsl-py2 at yahoo.com.ar  Fri May 15 21:30:01 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 15 May 2009 22:30:01 -0300
Subject: using urlretrive/urlopen
References: <f46c52560905150803i15ad7968m5fc13738906f8e7d@mail.gmail.com>
Message-ID: <op.utz04beqx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 12:03:09 -0300, Rustom Mody <rustompmody at gmail.com>  
escribi?:

> I am trying to talk to a server that runs on localhost
> The server runs on http://localhost:7000/ and that opens alright in? a
> web browser.
>
> However if I use urlopen or urlretrieve what I get is this 'file' --
> obviously not the one that the browser gets:
>
> <html><body bgcolor="#ffffff">
> Query 'http://localhost:7000/' not implemented
> </body></html>
> Any tips/clues?

Please post the code you're using to access the server.
Do you have any proxy set up?

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May 15 21:38:47 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 15 May 2009 22:38:47 -0300
Subject: How do i generate a tuple from a generator ?
References: <e9465b660905151358o1e0d15d3ve8dc447f634f98b@mail.gmail.com>
Message-ID: <op.utz1ixhrx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 17:58:55 -0300, eye zak <eye.zak.devel at gmail.com>  
escribi?:

> I have a situation where i want a tuple from a generator/sequence
> comprehension.
> I am wondering, is this possible ? or is this just a bad idea all  
> together?
>
> class iterator(object):
>     __slots__ = ('__iters',)
>
>     def __init__(self,*args):
>         assert len(args) != 0
>         self.__iters = tuple( __builtins__.iter(arg) for arg in args )
>
>     def __iter__(self,*args):
>         return self
>
>     def next(self):
>         return [ i.next() for i in self.__iters ]    # HERE I WANT A  
> TUPLE

That is exactly what itertools.izip does

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May 15 22:17:15 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 15 May 2009 23:17:15 -0300
Subject: Difference between list() and [] with dictionaries
References: <fe3354e50905151817ie4df792hebec03ae42eca25c@mail.gmail.com>
Message-ID: <op.utz3a1e3x6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 22:17:43 -0300, Sam Tregar <sam at tregar.com> escribi?:

> Hello all.  Can anyone explain why this creates a list containing a
> dictionary:
>
>   [{'a': 'b', 'foo': 'bar'}]
>
> But this creates a list of keys of the dictionary:
>
>   list({ "a": "b", "foo": "bar" })
>
> I expected them to be equivalent but clearly they're not!  I'm using  
> Python
> 2.6.1 if that helps.

First, a list display [...] and the list constructor list(...) aren't  
quite the same: [1,2,3] is ok; list(1,2,3) is an error. So clearly they  
are not equivalent and you'll have to tune up your expectations :)

list() can take a *single* argument only, a list display [a, b, c] can  
have many comma-separated expressions. So the only possible confusion is  
between list(<x>) and [<x>] where <x> stands for a single expression.

In list(<x>), <x> must be iterable, and means (more or less):

result = []
for item in <x>:
   result.append(item)
return result

In words, list(<x>) iterates over its argument, collecting each item  
yielded into the returned list.

For example, a dictionary is iterable, yielding its keys;  
list(some_dictionary) behaves like you describe in your example. Another  
one: list("abc") returns ['a', 'b', 'c'] because a string is iterable too,  
yielding each of its characters. list(3) is an error because its argument  
must be iterable; list([3]) works, but it's a silly way of simply writting  
[3].

On the other hand, a list display like [...] just collects the expressions  
inside the brackets into a list. No iteration is involved: [<x>] builds a  
list containing a single element, and it doesn't matter whether <x> is  
iterable or not: whatever it is, it becomes the first and only element in  
the returned list.

There is another way of building a list, a "list comprehension". The  
syntax uses brackets too, but explicitely involves an iteration with the  
"for" keyword:
[x for x in range(10) if x%3!=0] yields [1, 2, 4, 5, 7, 8]

-- 
Gabriel Genellina



From mvilas at gmail.com  Fri May 15 22:23:25 2009
From: mvilas at gmail.com (Mario Alejandro Vilas Jerez)
Date: Fri, 15 May 2009 23:23:25 -0300
Subject: WinAppDbg module v1.1 is out!
Message-ID: <3fbf862f0905151923n1278b658p7b2397cfeb3bb197@mail.gmail.com>

What is WinAppDbg?
==================

The WinAppDbg python module allows developers to quickly code
instrumentation
scripts in Python under a Windows environment.

It uses ctypes to wrap many Win32 API calls related to debugging, and
provides
an object-oriented abstraction layer to manipulate threads, libraries and
processes, attach your script as a debugger, trace execution, hook API
calls,
handle events in your debugee and set breakpoints of different kinds (code,
hardware and memory). Additionally it has no native code at all, making it
easier to maintain or modify than other debuggers on Windows.

The intended audience are QA engineers and software security auditors
wishing to
test / fuzz Windows applications with quickly coded Python scripts. Several
ready to use utilities are shipped and can be used for this purposes.

Current features also include disassembling x86 native code (using the open
source diStorm project, see http://ragestorm.net/distorm/), debugging
multiple
processes simultaneously and produce a detailed log of application crashes,
useful for fuzzing and automated testing.


Where can I find WinAppDbg?
===========================

The WinAppDbg project is currently hosted at Sourceforge, and can be found
at:

    http://winappdbg.sourceforge.net/

It's also hosted at the Python Package Index (PyPi):

    http://pypi.python.org/pypi/winappdbg/1.1
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From gagsl-py2 at yahoo.com.ar  Fri May 15 22:38:58 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 15 May 2009 23:38:58 -0300
Subject: Case insensitive version of string.Template?
References: <1242401709.20313.1315649183@webmail.messagingengine.com>
Message-ID: <op.utz4a8lwx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 12:35:09 -0300, <python at bdurham.com> escribi?:

> Using Python 2.6 or higher: Is there a way to configure
> string.Template() to ignore the case of matched identifiers?
> In other words, given the following Template string and
> dictionary where all keys are lowercase, is there a way to have
> my identifiers expanded based on their lowercase values?
> import string
> values = dict( name='John Doe', phone='999-555-1212' )
> output = string.Template( 'My name is $NAME and my phone is
> $Phone.' ).safe_substitute( values )

If you can guarantee the identifiers are all lowercase inside the  
dictionary:

class lowercase_dict(dict):
     def __getitem__(self, name):
         return dict.__getitem__(self, name.lower())

import string
values = lowercase_dict( name='John Doe', phone='999-555-1212' )
output = string.Template( 'My name is $NAME and my phone is $Phone.'  
).safe_substitute( values )

py> output
'My name is John Doe and my phone is 999-555-1212.'

If you cannot guarantee that, subclass string.Template:

class lowercase_template(string.Template):
   def safe_substitute(self, mapping=None, **kws):
     if mapping is None:
       mapping = {}
     m = lowercase_dict((k.lower(),v) for k,v in mapping.items())
     m.update(lowercase_dict((k.lower(),v) for k,v in kws.items()))
     return string.Template.safe_substitute(self, m)

-- 
Gabriel Genellina



From nad at acm.org  Fri May 15 22:46:12 2009
From: nad at acm.org (Ned Deily)
Date: Fri, 15 May 2009 19:46:12 -0700
Subject: Difference between list() and [] with dictionaries
References: <fe3354e50905151817ie4df792hebec03ae42eca25c@mail.gmail.com>
Message-ID: <nad-796A27.19461215052009@news.gmane.org>

In article 
<fe3354e50905151817ie4df792hebec03ae42eca25c at mail.gmail.com>,
 Sam Tregar <sam at tregar.com> wrote:
> Can anyone explain why this creates a list containing a
> dictionary:
>   [{'a': 'b', 'foo': 'bar'}] 
> But this creates a list of keys of the dictionary:
>   list({ "a": "b", "foo": "bar" })

The first example is a list, expressed as a list display literal, 
containing one object: a dictionary, expressed as a dictionary display 
literal.

<http://docs.python.org/reference/expressions.html#atoms>

The second example is a call to the built-in function "list", which 
takes a single iterable as an argument and returns "a list whose items 
are the same and in the same order as iterable?s items".  In this case, 
that single argument is a dictionary.  In an iteration context, the 
iterator obtained for a dictionary iterates over the dictionary's keys.  
The second example is essentially shorthand for:

    list({ "a": "b", "foo": "bar" }.iterkeys())

<http://docs.python.org/library/functions.html#list>
<http://docs.python.org/library/stdtypes.html#mapping-types-dict>

-- 
 Ned Deily,
 nad at acm.org



From gagsl-py2 at yahoo.com.ar  Fri May 15 23:02:28 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 16 May 2009 00:02:28 -0300
Subject: Appending traceback from exception in child thread
References: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>
Message-ID: <op.utz5eethx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 15:09:45 -0300, Edd <edd at nunswithguns.net> escribi?:

> As the comment on the last line indicates, looking at the .value() of
> a Future may give the return value of the associated task, or it may
> also propagate an exception that was raised in a child thread.
>
> Inside the implementation I store caught exceptions with code that
> looks something like:
>
>     try:
>         self.return_value = self.task()
>     except:
>         self.exception = sys.exc_info()[1]
>
> The problem I have is that when an exception is propagated in to the
> parent thread by re-raising it, the part of the traceback from the
> child thread is lost. So if the program dies due to such an exception,
> I can't see what caused it by examining the printed traceback.
>
> To solve this problem, I could of course grab the traceback in the
> child thread and create some kind of custom exception that stashes the
> trace inside. This could then be caught on the fringes of my code in
> order to combine the tracebacks of parent and child together before
> printing it. But I was wondering if there might be a nicer way that
> keeps the original exception object. Perhaps something akin to gluing
> the tracebacks together at the point where the exception is re-raised?

You could use the 3-argument form of the raise statement:
http://docs.python.org/reference/simple_stmts.html#the-raise-statement

There is a problem: remember that the traceback object keeps a reference  
to all previous frames -- that means, all local variables along the whole  
stack of called functions are kept alive until you delete the traceback  
object. And depending on your application, that might involve thousand of  
objects "artificially" alive for an undeterminate period of time...

It it's just for logging/debugging and you don't require access to the  
"live" objects, using a custom attribute in the exception object to store  
a list of strings (like the one traceback.extract_tb builds) may be a  
better idea.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May 15 23:11:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 16 May 2009 00:11:21 -0300
Subject: ConfigParser examples?
References: <gukn24$a47$1@ger.gmane.org>
Message-ID: <op.utz5s70zx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 18:32:57 -0300, Esmail <ebonak at hotmail.com> escribi?:

> Can anyone point to on the web, or possibly share a simple example
> of the use of the ConfigParser module?

The (excellent!) article series by Doug Hellmann, "Python Module of the  
Week", covers ConfigParser (and almost the whole standard library by now).

http://www.doughellmann.com/PyMOTW

-- 
Gabriel Genellina



From greg at cosc.canterbury.ac.nz  Fri May 15 23:15:48 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Sat, 16 May 2009 15:15:48 +1200
Subject: python copy method alters type
In-Reply-To: <mailman.137.1242306343.8015.python-list@python.org>
References: <mailman.137.1242306343.8015.python-list@python.org>
Message-ID: <776pcgF1eefhuU1@mid.individual.net>

Zhenhai Zhang wrote:

> a: ['a', 1, 3, 4]
> c: ['c' '2' '3' '4']

The lack of commas here suggests that c is actually
a numpy array rather than a list.

Did you import copy from Numeric or numpy, by any
chance?

The following experiment reproduces your result:

 >>> import numpy
 >>> a = ['a', 1, 2, 3]
 >>> c = numpy.copy(a)
 >>> print c
['a' '1' '2' '3']

What's happening here is that numpy.copy is using
the type of the first element to decide the type
of the whole array, and then converting the rest
of the elements to that type.

If you want the standard Python copying behaviour,
use copy.copy instead (or use a[:], which might
be slightly more efficient).

-- 
Greg


From tomf.sessile at gmail.com  Sat May 16 00:18:43 2009
From: tomf.sessile at gmail.com (TomF)
Date: Fri, 15 May 2009 21:18:43 -0700
Subject: Python system with exemplary organization/coding style
References: <2009051416013116807-tomfsessile@gmailcom>
	<fe6abf21-c0ed-426f-b837-0149f4f86858@e20g2000vbc.googlegroups.com>
Message-ID: <2009051521184316807-tomfsessile@gmailcom>

On 2009-05-14 16:18:07 -0700, CTO <debatem1 at gmail.com> said:

> On May 14, 7:01?pm, TomF <tomf.sess... at gmail.com> wrote:
>> I'm looking for a medium-sized Python system with very good coding
>> style and good code organization, so I can learn from it. ?I'm reading
>> various books on Python with advice on such things but I'd prefer to
>> see a real system.
>> 
>> By medium-sized I mean 5-20 classes, 5-20 files, etc; a code base that
>> has some complexity but isn't overwhelming.
>> 
>> Thanks,
>> -Tom
> 
> I'd recommend screenlets. Good documentation and pretty good style,
> and
> they have some external dependencies so you can see how that operates,
> and of course you can see what your code is and isn't doing pretty
> quickly.
> 
> <URL: http://www.screenlets.org>

Thanks, this does look pretty good.  Too bad it's grapics oriented, but 
I suppose I can filter out the graphics dependencies.

-Tom





From descentspb at gmail.com  Sat May 16 02:40:26 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sat, 16 May 2009 10:40:26 +0400
Subject: KeyboardInterrupt catch does not shut down the socketserver
In-Reply-To: <op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>
References: <mailman.183.1242371089.8015.python-list@python.org>	<guj8dv$5sl$2@lust.ihug.co.nz>	<mailman.185.1242375959.8015.python-list@python.org>	<gujl41$d0r$2@lust.ihug.co.nz>
	<4A0D5A35.3010008@gmail.com>
	<op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4A0E5FDA.4070008@gmail.com>

Gabriel Genellina wrote:
> En Fri, 15 May 2009 09:04:05 -0300, Igor Katson escribi?:
>> Lawrence D'Oliveiro wrote:
>>> In message <mailman.185.1242375959.8015.python-list at python.org>, 
>>> Igor Katson wrote:
>>>> Lawrence D'Oliveiro wrote:
>>>>> In message <mailman.183.1242371089.8015.python-list at python.org>, 
>>>>> Igor Katson wrote:
>>>>>
>>>>>> I have problems in getting a SocketServer to shutdown.
>>>>>>
>>>>> Do you want to do a shutdown or a close?
>>>>>
>>>> I want the server close the socket ...
>>>>
>>>
>>> You want to do a close, do a close, not a shutdown 
>>> <http://docs.python.org/library/socket.html>.
>>>
>> Shutdown implies closing the listening socket, doesn't it?
>
> No (perhaps it should, but that is another issue). There is a
> documentation bug; BaseServer.shutdown is documented as "Tells the
> serve_forever() loop to stop and waits until it does." [1]
> The docstring is much more explicit: """Stops the serve_forever loop.
> Blocks until the loop has finished. This must be called while
> serve_forever() is running in another thread, or it will deadlock."""
>
> So, if you have a single-threaded server, *don't* use shutdown(). And, to
> orderly close the listening socket, use server_close() instead. Your code
> would become:
>
>    from SocketServer import TCPServer, BaseRequestHandler
>
> server = TCPServer(('localhost',1234), BaseRequestHandler)
> try:
>       server.serve_forever()
> except KeyboardInterrupt:
>       print "^C detected"
>       pass
> finally:
>       print "server_close()"
>       server.server_close()
> print "bye"
>
> (I've opened http://bugs.python.org/issue6031 )
>
> [1]
> http://docs.python.org/dev/library/socketserver.html?highlight=baseserver#SocketServer.BaseServer.shutdown 
>
>
Thanks, Gabriel, that's exactly what I was waiting for.


From descentspb at gmail.com  Sat May 16 03:04:03 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sat, 16 May 2009 11:04:03 +0400
Subject: KeyboardInterrupt catch does not shut down the socketserver
In-Reply-To: <op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>
References: <mailman.183.1242371089.8015.python-list@python.org>	<guj8dv$5sl$2@lust.ihug.co.nz>	<mailman.185.1242375959.8015.python-list@python.org>	<gujl41$d0r$2@lust.ihug.co.nz>
	<4A0D5A35.3010008@gmail.com>
	<op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4A0E6563.2070400@gmail.com>

Gabriel Genellina wrote:
> En Fri, 15 May 2009 09:04:05 -0300, Igor Katson escribi?:
>> Lawrence D'Oliveiro wrote:
>>> In message <mailman.185.1242375959.8015.python-list at python.org>, 
>>> Igor Katson wrote:
>>>> Lawrence D'Oliveiro wrote:
>>>>> In message <mailman.183.1242371089.8015.python-list at python.org>, 
>>>>> Igor Katson wrote:
>>>>>
>>>>>> I have problems in getting a SocketServer to shutdown.
>>>>>>
>>>>> Do you want to do a shutdown or a close?
>>>>>
>>>> I want the server close the socket ...
>>>>
>>>
>>> You want to do a close, do a close, not a shutdown 
>>> <http://docs.python.org/library/socket.html>.
>>>
>> Shutdown implies closing the listening socket, doesn't it?
>
> No (perhaps it should, but that is another issue). There is a
> documentation bug; BaseServer.shutdown is documented as "Tells the
> serve_forever() loop to stop and waits until it does." [1]
> The docstring is much more explicit: """Stops the serve_forever loop.
> Blocks until the loop has finished. This must be called while
> serve_forever() is running in another thread, or it will deadlock."""
>
> So, if you have a single-threaded server, *don't* use shutdown(). And, to
> orderly close the listening socket, use server_close() instead. Your code
> would become:
>
>    from SocketServer import TCPServer, BaseRequestHandler
>
> server = TCPServer(('localhost',1234), BaseRequestHandler)
> try:
>       server.serve_forever()
> except KeyboardInterrupt:
>       print "^C detected"
>       pass
> finally:
>       print "server_close()"
>       server.server_close()
> print "bye"
>
> (I've opened http://bugs.python.org/issue6031 )
>
> [1]
> http://docs.python.org/dev/library/socketserver.html?highlight=baseserver#SocketServer.BaseServer.shutdown 
>
>
Hmm. Gabriel, could you please show the same for the threaded version? 
This one deadlocks:

from SocketServer import TCPServer, BaseRequestHandler
from threading import Thread

server = TCPServer(('localhost',1234), BaseRequestHandler)
try:
    run_thread = Thread(target=server.serve_forever)
    run_thread.start()
    run_thread.join()
except KeyboardInterrupt:
    print "^C detected"
    pass
finally:
    print "server_shutdown()"
    kill_thread = Thread(target=server.shutdown)
    kill_thread.start()
print "bye"


From deets at nospam.web.de  Sat May 16 03:45:57 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 16 May 2009 09:45:57 +0200
Subject: Appending traceback from exception in child thread
In-Reply-To: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>
References: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>
Message-ID: <77799nF1fk3ihU1@mid.uni-berlin.de>

Edd schrieb:
> Hi folks,
> 
> I have a some threadpool code that works like this :
> 
>     tp = ThreadPool(number_of_threads)
>     futures = [tp.future(t) for t in tasks] # each task is callable
>     for f in futures:
>         print f.value() # <-- may propagate an exception
> 
> The idea being that a Future object represents a value that may or may
> not have been computed yet and the .value() method will block until
> that value is ready.
> 
> As the comment on the last line indicates, looking at the .value() of
> a Future may give the return value of the associated task, or it may
> also propagate an exception that was raised in a child thread.
> 
> Inside the implementation I store caught exceptions with code that
> looks something like:
> 
>     try:
>         self.return_value = self.task()
>     except:
>         self.exception = sys.exc_info()[1]
> 
> The problem I have is that when an exception is propagated in to the
> parent thread by re-raising it, the part of the traceback from the
> child thread is lost. So if the program dies due to such an exception,
> I can't see what caused it by examining the printed traceback.
> 
> To solve this problem, I could of course grab the traceback in the
> child thread and create some kind of custom exception that stashes the
> trace inside. This could then be caught on the fringes of my code in
> order to combine the tracebacks of parent and child together before
> printing it. But I was wondering if there might be a nicer way that
> keeps the original exception object. Perhaps something akin to gluing
> the tracebacks together at the point where the exception is re-raised?

If you are only interested in the original traceback, you can get that 
with the traceback.format function.

Then you don't need to re-raise it in the main-thread, or if so, use the 
formatted stacktrace as payload to an exception.

Diez


From edd at nunswithguns.net  Sat May 16 05:43:25 2009
From: edd at nunswithguns.net (Edd)
Date: Sat, 16 May 2009 02:43:25 -0700 (PDT)
Subject: Appending traceback from exception in child thread
References: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>
	<mailman.248.1242442958.8015.python-list@python.org>
Message-ID: <bedd338c-20ea-43e9-9e67-a939dabbfafc@s21g2000vbb.googlegroups.com>

On May 16, 4:02?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:

> You could use the 3-argument form of the raise statement:http://docs.python.org/reference/simple_stmts.html#the-raise-statement

Ah! When did that get there? :)

> There is a problem: remember that the traceback object keeps a reference ?
> to all previous frames -- that means, all local variables along the whole ?
> stack of called functions are kept alive until you delete the traceback ?
> object. And depending on your application, that might involve thousand of ?
> objects "artificially" alive for an undeterminate period of time...

Yes, that may be problematic, I'll have to experiment.

Thanks to everyone's help here, I have plenty of alternatives if it
turns out to be problematic. Your comments are all greatly appreciated
-- thanks!

Kind regards,

Edd


From nick at craig-wood.com  Sat May 16 06:30:01 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sat, 16 May 2009 05:30:01 -0500
Subject: Need advice on distributing small module
References: <guhuqf$h3u$1@reader1.panix.com>
Message-ID: <slrnh0t31o.70l.nick@irishsea.home.craig-wood.com>

kj <socyl at 987jk.com.invalid> wrote:
>  The module has only one non-standard dependency, described by the
>  following code:
> 
>  if sys.version_info[:2] >= (2, 6):
>      import json
>  else:
>      import simplejson as json

I think

try:
    import json
except ImportError:
    import simplejson as json

Is more pythonic...  You aren't relying on what came with particular
python versions which may not be true in jython/ironpython/etc.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From arnodel at googlemail.com  Sat May 16 06:48:52 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 16 May 2009 11:48:52 +0100
Subject: How to get Exif data from a jpeg file
Message-ID: <m263g1pbl7.fsf@googlemail.com>

Hi all,

I need to get the creation date from a jpeg file in Python.  Googling
brought up a several references to apparently defunct modules.  The best
way I have been able to find so far is something like this:

from PIL import Image
img = Image.open('img.jpg')
exif_data = img._getexif()
creation_date = exif_data[36867]

Where 36867 is the exif tag for the creation date data (which I found by
ooking at PIL.ExifTags.TAGS).  But this doesn't even seem to be
documented in the PIL docs.  Is there a more natural way to do this?

Thanks.

-- 
Arnaud


From polygox at googlemail.com  Sat May 16 07:01:59 2009
From: polygox at googlemail.com (Adrian Genaid)
Date: Sat, 16 May 2009 13:01:59 +0200
Subject: using Winpdb in an embedded python interpreter
Message-ID: <20090516130159.3e3661ae@ira.uka.de>

Hi there, 

I have a problem using Winpdb in Pythonscripts running in a program
which uses an embedded Python interpreter. After linking all needed
modules statically to python, "import rpdb2" can be done and leads to
no error.
But on using the next line "rpdb2.start_embedded_debugger('password')".
an error occurs:

Exception in thread ioserver:
Traceback (most recent call last):
  File "C:\Program Files\Python30\lib\threading.py", line 507, in
_bootstrap_inn er
    self.run()
  File "S:\dev\adge\build\r3804\Debug_Win32\py\rpdb2.py", line 4570, in
run threading.Thread.run(self)
  File "C:\Program Files\Python30\lib\threading.py", line 462, in run
    self._target(*self._args, **self._kwargs)
  File "S:\dev\adge\build\r3804\Debug_Win32\py\rpdb2.py", line 9639, in
run (self.m_port, self.m_server) = self.__StartXMLRPCServer()
  File "S:\dev\adge\build\r3804\Debug_Win32\py\rpdb2.py", line 9730, in
__StartX MLRPCServer
    server = CXMLRPCServer((host, port), logRequests = 0)
  File "C:\Program Files\Python30\lib\xmlrpc\server.py", line 530, in
__init__ socketserver.TCPServer.__init__(self, addr, requestHandler,
bind_and_activat e)
  File "C:\Program Files\Python30\lib\socketserver.py", line 400, in
__init__ self.server_bind()
  File "C:\Program Files\Python30\lib\socketserver.py", line 411, in
server_bind

    self.socket.bind(self.server_address)
LookupError: unknown encoding: idna

Does someone have an idea why this error occurs?

Funny thing is that module "socketserver" is taken from "C:\Program
Files\Python30\lib\xmlrpc\server.py", although the module search path
does not contain "C:\Program Files\Python30\lib". Maybe this has
something to do with the problem...

Thanks,
Adrian


From phillip.oldham at gmail.com  Sat May 16 08:39:34 2009
From: phillip.oldham at gmail.com (Phillip B Oldham)
Date: Sat, 16 May 2009 05:39:34 -0700 (PDT)
Subject: Options for creating a statistics screen on a Mac with Python?
Message-ID: <64062d1f-b500-4ba2-9365-6f169bae82af@q2g2000vbr.googlegroups.com>

I've come into possession of a mac mini and a large LCD tv at the
office. I'd like to set it up in the corner to pull statistics from
our various servers (load, uptimes, etc) and display them in a
graphical format, full-screen, with a reasonable refresh rate (say
every 30 seconds). There will be quite a few statistics, and we'll be
adding new servers over time, and since there won't be the option to
scroll a full-screen web-page won't work.

What then would be my options to create a full-screen display of
statistics, and an attractive graphical way, using Python on OS X?


From gert.cuykens at gmail.com  Sat May 16 08:56:59 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 16 May 2009 05:56:59 -0700 (PDT)
Subject: open(os.path.join(os.path.dirname(__file__), '../www/bin/picture.png'),
	'rb')
Message-ID: <bd33f4d1-7dc4-4b56-b9cd-72f7f67492c5@f16g2000vbf.googlegroups.com>

open(os.path.join(os.path.dirname(__file__),'../www/bin/picture.png'),
'rb')
how do you do this on windows (py3) so it still works on linux ?


From deets at nospam.web.de  Sat May 16 09:15:58 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 16 May 2009 15:15:58 +0200
Subject: Options for creating a statistics screen on a Mac with Python?
In-Reply-To: <64062d1f-b500-4ba2-9365-6f169bae82af@q2g2000vbr.googlegroups.com>
References: <64062d1f-b500-4ba2-9365-6f169bae82af@q2g2000vbr.googlegroups.com>
Message-ID: <777skeF1g4b5gU1@mid.uni-berlin.de>

Phillip B Oldham schrieb:
> I've come into possession of a mac mini and a large LCD tv at the
> office. I'd like to set it up in the corner to pull statistics from
> our various servers (load, uptimes, etc) and display them in a
> graphical format, full-screen, with a reasonable refresh rate (say
> every 30 seconds). There will be quite a few statistics, and we'll be
> adding new servers over time, and since there won't be the option to
> scroll a full-screen web-page won't work.
> 
> What then would be my options to create a full-screen display of
> statistics, and an attractive graphical way, using Python on OS X?

matplotlib should serve you well. Or you use some web-based solution 
with a javascript-based chart library. This might be even a bit easier.


Diez


From deets at nospam.web.de  Sat May 16 09:16:42 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 16 May 2009 15:16:42 +0200
Subject: open(os.path.join(os.path.dirname(__file__),
	'../www/bin/picture.png'), 'rb')
In-Reply-To: <bd33f4d1-7dc4-4b56-b9cd-72f7f67492c5@f16g2000vbf.googlegroups.com>
References: <bd33f4d1-7dc4-4b56-b9cd-72f7f67492c5@f16g2000vbf.googlegroups.com>
Message-ID: <777slqF1g4b5gU2@mid.uni-berlin.de>

gert schrieb:
> open(os.path.join(os.path.dirname(__file__),'../www/bin/picture.png'),
> 'rb')
> how do you do this on windows (py3) so it still works on linux ?

os.path.join("..", "www", "bin", "picture.png")

Or use os.sep.

Diez


From s.selvamsiva at gmail.com  Sat May 16 09:18:13 2009
From: s.selvamsiva at gmail.com (S.Selvam)
Date: Sat, 16 May 2009 18:48:13 +0530
Subject: Generic web parser
Message-ID: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>

Hi all,

I have to design web parser which will visit the given list of websites and
need to fetch a particular set of details.
It has to be so generic that even if we add new websites, it must fetch
those details if available anywhere.
So it must be something like a framework.

Though i have done some parsers ,but they will parse for a given format(For.
eg It will get the data from <title> tag).But here each website may have
different format and the information may available within any tags.

I know its a tough task for me,but i feel with python it should be possible.
My request is, if such thing is already available please let me know ,also
your suggestions are welcome.

Note: I planned to use BeautifulSoup for parsing.

-- 
Yours,
S.Selvam
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From google at mrabarnett.plus.com  Sat May 16 09:35:02 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 16 May 2009 14:35:02 +0100
Subject: open(os.path.join(os.path.dirname(__file__),
	'../www/bin/picture.png'), 'rb')
In-Reply-To: <777slqF1g4b5gU2@mid.uni-berlin.de>
References: <bd33f4d1-7dc4-4b56-b9cd-72f7f67492c5@f16g2000vbf.googlegroups.com>
	<777slqF1g4b5gU2@mid.uni-berlin.de>
Message-ID: <4A0EC106.3050609@mrabarnett.plus.com>

Diez B. Roggisch wrote:
> gert schrieb:
>> open(os.path.join(os.path.dirname(__file__),'../www/bin/picture.png'),
>> 'rb')
>> how do you do this on windows (py3) so it still works on linux ?
> 
> os.path.join("..", "www", "bin", "picture.png")
> 
> Or use os.sep.
> 
Windows should understand '/' as well as '\'.


From gert.cuykens at gmail.com  Sat May 16 09:40:02 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 16 May 2009 06:40:02 -0700 (PDT)
Subject: open(os.path.join(os.path.dirname(__file__),
	'../www/bin/picture.png'), 'rb')
References: <bd33f4d1-7dc4-4b56-b9cd-72f7f67492c5@f16g2000vbf.googlegroups.com>
	<777slqF1g4b5gU2@mid.uni-berlin.de>
Message-ID: <5db266a3-c4d6-4567-baba-2aca6f505261@t10g2000vbg.googlegroups.com>

On May 16, 3:16?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> gert schrieb:
>
> > open(os.path.join(os.path.dirname(__file__),'../www/bin/picture.png'),
> > 'rb')
> > how do you do this on windows (py3) so it still works on linux ?
>
> os.path.join("..", "www", "bin", "picture.png")
>
> Or use os.sep.
>
> Diez

IOError: [Errno 2] No such file or directory: 'C:\\Users\\gert\\Desktop
\\koen\\a
ppwsgi/wsgi\\..\\www\\bin\\picture.png'

The os.path.dirname(__file__) is still in posix mode ?



From gert.cuykens at gmail.com  Sat May 16 09:45:32 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 16 May 2009 06:45:32 -0700 (PDT)
Subject: open(os.path.join(os.path.dirname(__file__),
	'../www/bin/picture.png'), 'rb')
References: <bd33f4d1-7dc4-4b56-b9cd-72f7f67492c5@f16g2000vbf.googlegroups.com>
	<777slqF1g4b5gU2@mid.uni-berlin.de>
	<5db266a3-c4d6-4567-baba-2aca6f505261@t10g2000vbg.googlegroups.com>
Message-ID: <f9de36bf-0c70-441e-a3f3-72cce2d1f08f@n4g2000vba.googlegroups.com>

On May 16, 3:40?pm, gert <gert.cuyk... at gmail.com> wrote:
> On May 16, 3:16?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> > gert schrieb:
>
> > > open(os.path.join(os.path.dirname(__file__),'../www/bin/picture.png'),
> > > 'rb')
> > > how do you do this on windows (py3) so it still works on linux ?
>
> > os.path.join("..", "www", "bin", "picture.png")
>
> > Or use os.sep.
>
> > Diez
>
> IOError: [Errno 2] No such file or directory: 'C:\\Users\\gert\\Desktop
> \\koen\\a
> ppwsgi/wsgi\\..\\www\\bin\\picture.png'
>
> The os.path.dirname(__file__) is still in posix mode ?

DOH!!! forgot to actually put the file in the directory :)
works both ways never mind the question, thanks.


From sebastianthegreatful at gmail.com  Sat May 16 09:51:31 2009
From: sebastianthegreatful at gmail.com (Seb)
Date: Sat, 16 May 2009 06:51:31 -0700 (PDT)
Subject: xml menu pygtk
Message-ID: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>

I'm trying to construct a menu from an xml file. However my recursive
algorithm isn't doing what I want it too. I've been starring at this
for too long. Any help appreciated :)

I get the following error but the problem is more of a logical nature.
./gnomeAppletMenu.py:40: GtkWarning: gtk_menu_shell_insert: assertion
`GTK_IS_MENU_ITEM (child)' failed
  menu_bar.append(menu)

I'm pretty sure I fuck up around line 27-30

xml file:
http://pastie.org/480045

python code:
http://pastie.org/480042


best regards,
Seb


From google at mrabarnett.plus.com  Sat May 16 10:20:30 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 16 May 2009 15:20:30 +0100
Subject: xml menu pygtk
In-Reply-To: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>
References: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>
Message-ID: <4A0ECBAE.9010000@mrabarnett.plus.com>

Seb wrote:
> I'm trying to construct a menu from an xml file. However my recursive
> algorithm isn't doing what I want it too. I've been starring at this
> for too long. Any help appreciated :)
> 
> I get the following error but the problem is more of a logical nature.
> ./gnomeAppletMenu.py:40: GtkWarning: gtk_menu_shell_insert: assertion
> `GTK_IS_MENU_ITEM (child)' failed
>   menu_bar.append(menu)
> 
> I'm pretty sure I fuck up around line 27-30
> 
> xml file:
> http://pastie.org/480045
> 
> python code:
> http://pastie.org/480042
> 
The traceback suggests to me that you can add only a 'MenuItem' to a
'MenuBar', but create_menu() is returning a 'Menu'.


From sebastianthegreatful at gmail.com  Sat May 16 10:27:11 2009
From: sebastianthegreatful at gmail.com (Seb)
Date: Sat, 16 May 2009 07:27:11 -0700 (PDT)
Subject: xml menu pygtk
References: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>
	<mailman.258.1242483622.8015.python-list@python.org>
Message-ID: <e25acc20-bea6-4461-9f30-b7a51f27ef05@m24g2000vbp.googlegroups.com>

On May 16, 4:20?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Seb wrote:
> > I'm trying to construct a menu from an xml file. However my recursive
> > algorithm isn't doing what I want it too. I've been starring at this
> > for too long. Any help appreciated :)
>
> > I get the following error but the problem is more of a logical nature.
> > ./gnomeAppletMenu.py:40: GtkWarning: gtk_menu_shell_insert: assertion
> > `GTK_IS_MENU_ITEM (child)' failed
> > ? menu_bar.append(menu)
>
> > I'm pretty sure I fuck up around line 27-30
>
> > xml file:
> >http://pastie.org/480045
>
> > python code:
> >http://pastie.org/480042
>
> The traceback suggests to me that you can add only a 'MenuItem' to a
> 'MenuBar', but create_menu() is returning a 'Menu'.

Doesn't a MenuBar consists of Menu's?

best regards,
Seb


From phillip.oldham at gmail.com  Sat May 16 10:54:35 2009
From: phillip.oldham at gmail.com (Phillip B Oldham)
Date: Sat, 16 May 2009 07:54:35 -0700 (PDT)
Subject: Options for creating a statistics screen on a Mac with Python?
References: <64062d1f-b500-4ba2-9365-6f169bae82af@q2g2000vbr.googlegroups.com>
	<777skeF1g4b5gU1@mid.uni-berlin.de>
Message-ID: <88270345-ede7-42b6-af27-b41e79461951@m24g2000vbp.googlegroups.com>

On May 16, 2:15?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> matplotlib should serve you well.

Thanks, I'll check that out.

> Or you use some web-based solution with a javascript-based chart library.

I'd rather stay away from web-based solutions; since this is going to
be running 24/7 and has a fixed a screen size. I'd prefer something
that has few dependencies, if possible hooking into the OS X platform
for graphics.


From google at mrabarnett.plus.com  Sat May 16 11:04:37 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 16 May 2009 16:04:37 +0100
Subject: xml menu pygtk
In-Reply-To: <e25acc20-bea6-4461-9f30-b7a51f27ef05@m24g2000vbp.googlegroups.com>
References: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>	<mailman.258.1242483622.8015.python-list@python.org>
	<e25acc20-bea6-4461-9f30-b7a51f27ef05@m24g2000vbp.googlegroups.com>
Message-ID: <4A0ED605.7030207@mrabarnett.plus.com>

Seb wrote:
> On May 16, 4:20 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>> Seb wrote:
>>> I'm trying to construct a menu from an xml file. However my recursive
>>> algorithm isn't doing what I want it too. I've been starring at this
>>> for too long. Any help appreciated :)
>>> I get the following error but the problem is more of a logical nature.
>>> ./gnomeAppletMenu.py:40: GtkWarning: gtk_menu_shell_insert: assertion
>>> `GTK_IS_MENU_ITEM (child)' failed
>>>   menu_bar.append(menu)
>>> I'm pretty sure I fuck up around line 27-30
>>> xml file:
>>> http://pastie.org/480045
>>> python code:
>>> http://pastie.org/480042
>> The traceback suggests to me that you can add only a 'MenuItem' to a
>> 'MenuBar', but create_menu() is returning a 'Menu'.
> 
> Doesn't a MenuBar consists of Menu's?
> 
I've had a look at some examples on the web and it looks like you need
to:

1. Set the menu on a menu item (the 'set_submenu' method);
2. Append the menu item onto the menu bar.

What you're actually doing is:

1. Setting the menu on a menu item;
2. Appending the menu item onto a menu;
3. Trying to append the menu onto the menu bar.

Result: exception.

HTH


From sebastianthegreatful at gmail.com  Sat May 16 11:15:24 2009
From: sebastianthegreatful at gmail.com (Seb)
Date: Sat, 16 May 2009 08:15:24 -0700 (PDT)
Subject: xml menu pygtk
References: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>
	<mailman.258.1242483622.8015.python-list@python.org>
	<e25acc20-bea6-4461-9f30-b7a51f27ef05@m24g2000vbp.googlegroups.com>
	<mailman.259.1242486269.8015.python-list@python.org>
Message-ID: <56fd84aa-478c-4310-913f-bcfd1905813e@q14g2000vbn.googlegroups.com>

On May 16, 5:04?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Seb wrote:
> > On May 16, 4:20 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> >> Seb wrote:
> >>> I'm trying to construct a menu from an xml file. However my recursive
> >>> algorithm isn't doing what I want it too. I've been starring at this
> >>> for too long. Any help appreciated :)
> >>> I get the following error but the problem is more of a logical nature.
> >>> ./gnomeAppletMenu.py:40: GtkWarning: gtk_menu_shell_insert: assertion
> >>> `GTK_IS_MENU_ITEM (child)' failed
> >>> ? menu_bar.append(menu)
> >>> I'm pretty sure I fuck up around line 27-30
> >>> xml file:
> >>>http://pastie.org/480045
> >>> python code:
> >>>http://pastie.org/480042
> >> The traceback suggests to me that you can add only a 'MenuItem' to a
> >> 'MenuBar', but create_menu() is returning a 'Menu'.
>
> > Doesn't a MenuBar consists of Menu's?
>
> I've had a look at some examples on the web and it looks like you need
> to:
>
> 1. Set the menu on a menu item (the 'set_submenu' method);
> 2. Append the menu item onto the menu bar.
>
> What you're actually doing is:
>
> 1. Setting the menu on a menu item;
> 2. Appending the menu item onto a menu;
> 3. Trying to append the menu onto the menu bar.
>
> Result: exception.
>
> HTH


Ok, now it looks like below. I don't get any errors but the dictionary
entry show up as a toplevel menu... damn!!

def create_menu(node):
	menus = []
	for child in node.childNodes:
		if child.localName == "item":
			menus.append(gtk.MenuItem(child.getAttribute("name")))
		if child.localName == "seperator":
			menus.append(gtk.SeparatorMenuItem())
		if child.localName == "menu": #if child.childNodes:
			menuitem = gtk.MenuItem(child.getAttribute("name"))
			menu = gtk.Menu()
			for mi in create_menu(child):	# for each menuitem
				menu.append(mi)		# append each menuitem to menu
			menuitem.set_submenu(menu)	# set menu as submenu of menuitem
			menus.append(menuitem)
	return menus

def factory(applet, iid):
	doc = minidom.parse("menu.xml")
	rootNode = doc.documentElement

	menu_bar = gtk.MenuBar()
	for cn in rootNode.childNodes:		# for each menu under menus
		for menu in create_menu(cn):	# for each menu in list
			menu_bar.append(menu)	# append each menu

	applet.add(menu_bar)
	applet.show_all()
	return True


From aahz at pythoncraft.com  Sat May 16 11:28:02 2009
From: aahz at pythoncraft.com (Aahz)
Date: 16 May 2009 08:28:02 -0700
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
	<50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com>
	<mailman.216.1242408349.8015.python-list@python.org>
	<180531ca-33aa-47b9-9c69-5b5973f6b6f9@v35g2000pro.googlegroups.com>
Message-ID: <gumm22$itv$1@panix3.panix.com>

In article <180531ca-33aa-47b9-9c69-5b5973f6b6f9 at v35g2000pro.googlegroups.com>,
John Machin  <sjmachin at lexicon.net> wrote:
>
>Neat trick. However, from 2.6.2:
>
>>>> help(sum)
>Help on built-in function sum in module __builtin__:
>
>sum(...)
>    sum(sequence[, start]) -> value
>
>    Returns the sum of a sequence of numbers (NOT strings) plus the
>value
>    of parameter 'start' (which defaults to 0).  When the sequence is
>    empty, returns start.
>
>Since when is a list a number? Perhaps the help needs clarification,
>in line with the docs.

The primary use-case for sum() is numbers, with a special exception to
prohibit using strings.  Only strings are prohibited to allow using sum()
with user-defined classes.  That makes it a little difficult to document
precisely in a summary; unless you can come up with a specific better
wording, the docs will probably stay as-is.  If you do come up with
something better, please file it on bugs.python.org.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From sebastianthegreatful at gmail.com  Sat May 16 11:39:58 2009
From: sebastianthegreatful at gmail.com (Seb)
Date: Sat, 16 May 2009 08:39:58 -0700 (PDT)
Subject: xml menu pygtk
References: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>
	<mailman.258.1242483622.8015.python-list@python.org>
	<e25acc20-bea6-4461-9f30-b7a51f27ef05@m24g2000vbp.googlegroups.com>
	<mailman.259.1242486269.8015.python-list@python.org>
Message-ID: <c6bd7cd9-e92c-4935-8d90-c401e8d5a1ae@x6g2000vbg.googlegroups.com>

On May 16, 5:04?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Seb wrote:
> > On May 16, 4:20 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> >> Seb wrote:
> >>> I'm trying to construct a menu from an xml file. However my recursive
> >>> algorithm isn't doing what I want it too. I've been starring at this
> >>> for too long. Any help appreciated :)
> >>> I get the following error but the problem is more of a logical nature.
> >>> ./gnomeAppletMenu.py:40: GtkWarning: gtk_menu_shell_insert: assertion
> >>> `GTK_IS_MENU_ITEM (child)' failed
> >>> ? menu_bar.append(menu)
> >>> I'm pretty sure I fuck up around line 27-30
> >>> xml file:
> >>>http://pastie.org/480045
> >>> python code:
> >>>http://pastie.org/480042
> >> The traceback suggests to me that you can add only a 'MenuItem' to a
> >> 'MenuBar', but create_menu() is returning a 'Menu'.
>
> > Doesn't a MenuBar consists of Menu's?
>
> I've had a look at some examples on the web and it looks like you need
> to:
>
> 1. Set the menu on a menu item (the 'set_submenu' method);
> 2. Append the menu item onto the menu bar.
>
> What you're actually doing is:
>
> 1. Setting the menu on a menu item;
> 2. Appending the menu item onto a menu;
> 3. Trying to append the menu onto the menu bar.
>
> Result: exception.
>
> HTH

I managed to get it to work. I thanks a lot for your help.

best regards,
Seb


From rcdailey at gmail.com  Sat May 16 12:33:50 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Sat, 16 May 2009 09:33:50 -0700 (PDT)
Subject: tarfile doesn't work with tgz files?
Message-ID: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>

Hi,

I'm not a big expert on the tarfile component, but I assumed that .tgz
files were short for .tar.gz and the format was the same. When I try
to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
the following error:

  File "C:\Python30\lib\tarfile.py", line 1630, in open
    raise ReadError("file could not be opened successfully")
tarfile.ReadError: file could not be opened successfully

I'm assuming this is because the .tgz format is not what I think it is
and is not supported. How can I extract .tgz files using Python 3.0?
Note that I probably can't depend on third party python modules, since
I have yet to find many that support Python 3.0.

Thanks.


From python at bdurham.com  Sat May 16 12:37:28 2009
From: python at bdurham.com (python at bdurham.com)
Date: Sat, 16 May 2009 12:37:28 -0400
Subject: Case insensitive version of string.Template?
In-Reply-To: <op.utz4a8lwx6zn5v@lepton.softlabbsas.com.ar>
References: <1242401709.20313.1315649183@webmail.messagingengine.com>
	<op.utz4a8lwx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <1242491848.21317.1315782933@webmail.messagingengine.com>

Gabriel,

<snipped>
If you can guarantee the identifiers are all lowercase inside the  
dictionary:

class lowercase_dict(dict):
     def __getitem__(self, name):
         return dict.__getitem__(self, name.lower())

import string
values = lowercase_dict( name='John Doe', phone='999-555-1212' )
output = string.Template( 'My name is $NAME and my phone is $Phone.'  
).safe_substitute( values )
</snipped>

Brilliant!! Using a custom dictionary solves my problem and gives me
some ideas on similar challenges.

Thank you!

Regards,
Malcolm


From kushal.kumaran at gmail.com  Sat May 16 12:46:01 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Sat, 16 May 2009 22:16:01 +0530
Subject: tarfile doesn't work with tgz files?
In-Reply-To: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
Message-ID: <1e364c4e0905160946w100a94dao501bdff24a665d6b@mail.gmail.com>

On Sat, May 16, 2009 at 10:03 PM, Robert Dailey <rcdailey at gmail.com> wrote:
> Hi,
>
> I'm not a big expert on the tarfile component, but I assumed that .tgz
> files were short for .tar.gz and the format was the same. When I try
> to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
> the following error:
>
> ?File "C:\Python30\lib\tarfile.py", line 1630, in open
> ? ?raise ReadError("file could not be opened successfully")
> tarfile.ReadError: file could not be opened successfully
>
> I'm assuming this is because the .tgz format is not what I think it is
> and is not supported. How can I extract .tgz files using Python 3.0?
> Note that I probably can't depend on third party python modules, since
> I have yet to find many that support Python 3.0.
>

Is the file itself correct?  Are you able to extract the files using
any compression program?  Do you have a version of tar installed that
you can try extracting the file with?  If you don't, a Windows version
of tar will be available with cygwin.

-- 
kushal


From rcdailey at gmail.com  Sat May 16 12:47:25 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Sat, 16 May 2009 09:47:25 -0700 (PDT)
Subject: tarfile doesn't work with tgz files?
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
Message-ID: <01171386-1966-45e0-8d92-d7e4ca9862d5@x6g2000vbg.googlegroups.com>

On May 16, 11:33?am, Robert Dailey <rcdai... at gmail.com> wrote:
> Hi,
>
> I'm not a big expert on the tarfile component, but I assumed that .tgz
> files were short for .tar.gz and the format was the same. When I try
> to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
> the following error:
>
> ? File "C:\Python30\lib\tarfile.py", line 1630, in open
> ? ? raise ReadError("file could not be opened successfully")
> tarfile.ReadError: file could not be opened successfully
>
> I'm assuming this is because the .tgz format is not what I think it is
> and is not supported. How can I extract .tgz files using Python 3.0?
> Note that I probably can't depend on third party python modules, since
> I have yet to find many that support Python 3.0.
>
> Thanks.

Correction, it is the following line that breaks:

tarfile.open( file )

When I try to *open* the file it fails, not extract. Sorry for the
mixup.


From gherron at islandtraining.com  Sat May 16 12:49:36 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Sat, 16 May 2009 09:49:36 -0700
Subject: tarfile doesn't work with tgz files?
In-Reply-To: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
Message-ID: <4A0EEEA0.1050107@islandtraining.com>

Robert Dailey wrote:
> Hi,
>
> I'm not a big expert on the tarfile component, but I assumed that .tgz
> files were short for .tar.gz and the format was the same. 

That's correct.

> When I try
> to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
> the following error:
>
>   File "C:\Python30\lib\tarfile.py", line 1630, in open
>     raise ReadError("file could not be opened successfully")
> tarfile.ReadError: file could not be opened successfully
>
> I'm assuming this is because the .tgz format is not what I think it is
> and is not supported.

Not true.  It's supported.
>  How can I extract .tgz files using Python 3.0?
> Note that I probably can't depend on third party python modules, since
> I have yet to find many that support Python 3.0.
>
> Thanks.
>   

It's hard to debug your code when you don't show us your code,  so I 
won't try.

I can however supply a bit of working code:

 >>> import tarfile
 >>> f=tarfile.open('f.tgz')
 >>> f.list()
-rw-r--r-- gherron/gherron        703 2009-03-14 15:59:46 t.py
-rw-r--r-- gherron/gherron        566 2009-05-15 09:13:08 note-bzr-hg
-rw-r--r-- gherron/gherron      11563 2009-04-24 09:33:12 .emacs

So the module correctly reads the tar-gzip file, and finds its contents.

Now, what is it you were trying to do?


Gary Herron





From manu3d at gmail.com  Sat May 16 12:55:39 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Sat, 16 May 2009 09:55:39 -0700 (PDT)
Subject: Swapping superclass from a module
Message-ID: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>

Hi everybody,

let's assume I have a module with loads of classes inheriting from one
class, from the same module, i.e.:

## myFile.py
class SuperClass(object)
class SubClass1(SuperClass)
class SubClass2(SuperClass)
class SubClass3(SuperClass)

In a separate file I also have:

## myOtherFile.py
class NewSuperClass(object)

Now, let's also assume that myFile.py cannot be changed or it's
impractical to do so. Is there a way to replace the SuperClass at
runtime, so that when I instantiate one of the subclasses
NewSuperClass is used instead of the original SuperClass provided by
the first module module?

That was the generic case. Would the solution change much if
NewSuperClass was actually inheriting from SuperClass, effectively
wedging itself between the SuperClass and the SubClasses?

Manu





From rcdailey at gmail.com  Sat May 16 12:55:59 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Sat, 16 May 2009 09:55:59 -0700 (PDT)
Subject: tarfile doesn't work with tgz files?
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
	<mailman.262.1242492583.8015.python-list@python.org>
Message-ID: <4854694f-12a3-48d3-a645-7fc111171574@x6g2000vbg.googlegroups.com>

On May 16, 11:49?am, Gary Herron <gher... at islandtraining.com> wrote:
> Robert Dailey wrote:
> > Hi,
>
> > I'm not a big expert on the tarfile component, but I assumed that .tgz
> > files were short for .tar.gz and the format was the same.
>
> That's correct.
>
> > When I try
> > to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
> > the following error:
>
> > ? File "C:\Python30\lib\tarfile.py", line 1630, in open
> > ? ? raise ReadError("file could not be opened successfully")
> > tarfile.ReadError: file could not be opened successfully
>
> > I'm assuming this is because the .tgz format is not what I think it is
> > and is not supported.
>
> Not true. ?It's supported.
>
> > ?How can I extract .tgz files using Python 3.0?
> > Note that I probably can't depend on third party python modules, since
> > I have yet to find many that support Python 3.0.
>
> > Thanks.
>
> It's hard to debug your code when you don't show us your code, ?so I
> won't try.
>
> I can however supply a bit of working code:
>
> ?>>> import tarfile
> ?>>> f=tarfile.open('f.tgz')
> ?>>> f.list()
> -rw-r--r-- gherron/gherron ? ? ? ?703 2009-03-14 15:59:46 t.py
> -rw-r--r-- gherron/gherron ? ? ? ?566 2009-05-15 09:13:08 note-bzr-hg
> -rw-r--r-- gherron/gherron ? ? ?11563 2009-04-24 09:33:12 .emacs
>
> So the module correctly reads the tar-gzip file, and finds its contents.
>
> Now, what is it you were trying to do?
>
> Gary Herron

I wasn't sure if my code was relevant, since there really isn't much
to show. Here is the convenience function I've created for extracting
the contents of a tar.gz or tgz file on Windows:

def untar( file, dst ):
   print( file )
   print( dst )
   tarball = tarfile.open( file )
   tarball.extractall( dst )
   tarball.close()

The respective results of the 2 print statements above are:

D:\IT\personal\layout-editor\temp\tbb21_20080605oss_src.tgz
D:\IT\personal\layout-editor\temp

And the full output I get:

Traceback (most recent call last):
  File "D:\IT\personal\layout-editor\third_party.py", line 257, in
<module>
    tbb.Process()
  File "D:\IT\personal\layout-editor\third_party.py", line 247, in
Process
    install_operation.Process( self, 'tbb' )
  File "D:\IT\personal\layout-editor\third_party.py", line 160, in
Process
    build_operation.Process( self, name )
  File "D:\IT\personal\layout-editor\third_party.py", line 138, in
Process
    self.Extract()
  File "D:\IT\personal\layout-editor\third_party.py", line 125, in
Extract
    extract( file, self._outdir )
  File "D:\IT\personal\layout-editor\third_party.py", line 43, in
untar
    tarball = tarfile.open( file )
  File "C:\Python30\lib\tarfile.py", line 1630, in open
    raise ReadError("file could not be opened successfully")
tarfile.ReadError: file could not be opened successfully


From rcdailey at gmail.com  Sat May 16 12:56:45 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Sat, 16 May 2009 09:56:45 -0700 (PDT)
Subject: tarfile doesn't work with tgz files?
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
	<mailman.261.1242492394.8015.python-list@python.org>
Message-ID: <21154344-1f98-49a5-9dfa-8d4992c75135@v4g2000vba.googlegroups.com>

On May 16, 11:46?am, Kushal Kumaran <kushal.kuma... at gmail.com> wrote:
> On Sat, May 16, 2009 at 10:03 PM, Robert Dailey <rcdai... at gmail.com> wrote:
> > Hi,
>
> > I'm not a big expert on the tarfile component, but I assumed that .tgz
> > files were short for .tar.gz and the format was the same. When I try
> > to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
> > the following error:
>
> > ?File "C:\Python30\lib\tarfile.py", line 1630, in open
> > ? ?raise ReadError("file could not be opened successfully")
> > tarfile.ReadError: file could not be opened successfully
>
> > I'm assuming this is because the .tgz format is not what I think it is
> > and is not supported. How can I extract .tgz files using Python 3.0?
> > Note that I probably can't depend on third party python modules, since
> > I have yet to find many that support Python 3.0.
>
> Is the file itself correct? ?Are you able to extract the files using
> any compression program? ?Do you have a version of tar installed that
> you can try extracting the file with? ?If you don't, a Windows version
> of tar will be available with cygwin.
>
> --
> kushal

Yes, I can open and extract it using WinRAR


From rcdailey at gmail.com  Sat May 16 13:04:03 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Sat, 16 May 2009 10:04:03 -0700 (PDT)
Subject: tarfile doesn't work with tgz files?
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
	<mailman.262.1242492583.8015.python-list@python.org>
Message-ID: <30d589fb-9b02-4c84-b56a-d6540bd93aa4@p4g2000vba.googlegroups.com>

On May 16, 11:49?am, Gary Herron <gher... at islandtraining.com> wrote:
> Robert Dailey wrote:
> > Hi,
>
> > I'm not a big expert on the tarfile component, but I assumed that .tgz
> > files were short for .tar.gz and the format was the same.
>
> That's correct.
>
> > When I try
> > to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
> > the following error:
>
> > ? File "C:\Python30\lib\tarfile.py", line 1630, in open
> > ? ? raise ReadError("file could not be opened successfully")
> > tarfile.ReadError: file could not be opened successfully
>
> > I'm assuming this is because the .tgz format is not what I think it is
> > and is not supported.
>
> Not true. ?It's supported.
>
> > ?How can I extract .tgz files using Python 3.0?
> > Note that I probably can't depend on third party python modules, since
> > I have yet to find many that support Python 3.0.
>
> > Thanks.
>
> It's hard to debug your code when you don't show us your code, ?so I
> won't try.
>
> I can however supply a bit of working code:
>
> ?>>> import tarfile
> ?>>> f=tarfile.open('f.tgz')
> ?>>> f.list()
> -rw-r--r-- gherron/gherron ? ? ? ?703 2009-03-14 15:59:46 t.py
> -rw-r--r-- gherron/gherron ? ? ? ?566 2009-05-15 09:13:08 note-bzr-hg
> -rw-r--r-- gherron/gherron ? ? ?11563 2009-04-24 09:33:12 .emacs
>
> So the module correctly reads the tar-gzip file, and finds its contents.
>
> Now, what is it you were trying to do?
>
> Gary Herron

Okay so I managed to figure out the problem.

Initially, I manually downloaded the TGZ above through Chrome and then
opened it in WinRAR and extracted the files. Everything worked fine.

Then, I ran my Python script which uses urlretrieve() to download the
file and then tarfile is used to extract it. However, urlretrieve()
was not downloading the full file because of a bug that was corrupting
my URL.

Sorry for the confusion, and thanks to everyone for the very prompt
help!


From anand.ibmgsi at gmail.com  Sat May 16 13:13:30 2009
From: anand.ibmgsi at gmail.com (anand j)
Date: Sat, 16 May 2009 22:43:30 +0530
Subject: Python code-bloat tool-- warning n00b stuff...
Message-ID: <1a3a139e0905161013p2ff1c024l260ad57433e1be20@mail.gmail.com>

Hi,
    I am looking for a bunch of rules or a tool that takes the code for my
python class and checks the amount of code bloat and points out where i can
improve. I am a n00b to python and built an application linking wordnet and
graph packages. but somehow have this nagging feeling my code is too bloated
with too many functions..... might just be paranoia , but worth an
investigation i guess.....

Sorry if this is a repeat/trivial question, I could not find any
comprehensive links on google or the mailing list archive that is within my
gmail. Currently, trying to download the other archives and index using
whoosh and try searching it.

Thanks

==============================================
Anand J
Center for Behaviour and Cognitive Sciences
University of Allahabad
Allahabad-211002
http://sites.google.com/a/cbcs.ac.in/students/anand
==============================================
The man who is really serious,
with the urge to find out what truth is,
has no style at all. He lives only in what is.
                 ~Bruce Lee
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From ebonak at hotmail.com  Sat May 16 13:23:48 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 16 May 2009 13:23:48 -0400
Subject: ConfigParser examples?
In-Reply-To: <op.utz5s70zx6zn5v@lepton.softlabbsas.com.ar>
References: <gukn24$a47$1@ger.gmane.org>
	<op.utz5s70zx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4A0EF6A4.3040704@hotmail.com>

Hi Gabriel,

Gabriel Genellina wrote:
> 
> The (excellent!) article series by Doug Hellmann, "Python Module of the 
> Week", covers ConfigParser (and almost the whole standard library by now).
> 
> http://www.doughellmann.com/PyMOTW

Thanks for the pointer, I hadn't come across this site before, it
looks like a place with a lot of useful information!

Esmail




From nick at craig-wood.com  Sat May 16 14:30:00 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sat, 16 May 2009 13:30:00 -0500
Subject: Options for creating a statistics screen on a Mac with Python?
References: <64062d1f-b500-4ba2-9365-6f169bae82af@q2g2000vbr.googlegroups.com>
	<777skeF1g4b5gU1@mid.uni-berlin.de>
Message-ID: <slrnh0tvua.gvq.nick@irishsea.home.craig-wood.com>

Diez B. Roggisch <deets at nospam.web.de> wrote:
>  Phillip B Oldham schrieb:
> > I've come into possession of a mac mini and a large LCD tv at the
> > office. I'd like to set it up in the corner to pull statistics from
> > our various servers (load, uptimes, etc) and display them in a
> > graphical format, full-screen, with a reasonable refresh rate (say
> > every 30 seconds). There will be quite a few statistics, and we'll be
> > adding new servers over time, and since there won't be the option to
> > scroll a full-screen web-page won't work.
> > 
> > What then would be my options to create a full-screen display of
> > statistics, and an attractive graphical way, using Python on OS X?
> 
>  matplotlib should serve you well. Or you use some web-based solution 
>  with a javascript-based chart library. This might be even a bit
>  easier.

I'd use pygame for a really clean full screen display.

Probably a bit more work, but you'll get something really cool at the
end of it!

here is how to use matplotlib on a pygame surface

  http://www.pygame.org/wiki/MatplotlibPygame

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From draeath.spamtrap at gmail.com  Sat May 16 14:33:04 2009
From: draeath.spamtrap at gmail.com (draeath)
Date: Sat, 16 May 2009 13:33:04 -0500
Subject: tarfile doesn't work with tgz files?
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
	<mailman.262.1242492583.8015.python-list@python.org>
	<30d589fb-9b02-4c84-b56a-d6540bd93aa4@p4g2000vba.googlegroups.com>
Message-ID: <bfmdncMY-4V9m5LXnZ2dnUVZ_uGdnZ2d@giganews.com>

On 2009-05-16, Robert Dailey <rcdailey at gmail.com> wrote:
> On May 16, 11:49?am, Gary Herron <gher... at islandtraining.com> wrote:
>> Robert Dailey wrote:
>> > Hi,
>>
>> > I'm not a big expert on the tarfile component, but I assumed that .tgz
>> > files were short for .tar.gz and the format was the same.
>>
>> That's correct.
>>
>> > When I try
>> > to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
>> > the following error:
>>
>> > ? File "C:\Python30\lib\tarfile.py", line 1630, in open
>> > ? ? raise ReadError("file could not be opened successfully")
>> > tarfile.ReadError: file could not be opened successfully
>>
>> > I'm assuming this is because the .tgz format is not what I think it is
>> > and is not supported.
>>
>> Not true. ?It's supported.
>>
>> > ?How can I extract .tgz files using Python 3.0?
>> > Note that I probably can't depend on third party python modules, since
>> > I have yet to find many that support Python 3.0.
>>
>> > Thanks.
>>
>> It's hard to debug your code when you don't show us your code, ?so I
>> won't try.
>>
>> I can however supply a bit of working code:
>>
>> ?>>> import tarfile
>> ?>>> f=tarfile.open('f.tgz')
>> ?>>> f.list()
>> -rw-r--r-- gherron/gherron ? ? ? ?703 2009-03-14 15:59:46 t.py
>> -rw-r--r-- gherron/gherron ? ? ? ?566 2009-05-15 09:13:08 note-bzr-hg
>> -rw-r--r-- gherron/gherron ? ? ?11563 2009-04-24 09:33:12 .emacs
>>
>> So the module correctly reads the tar-gzip file, and finds its contents.
>>
>> Now, what is it you were trying to do?
>>
>> Gary Herron
>
> Okay so I managed to figure out the problem.
>
> Initially, I manually downloaded the TGZ above through Chrome and then
> opened it in WinRAR and extracted the files. Everything worked fine.
>
> Then, I ran my Python script which uses urlretrieve() to download the
> file and then tarfile is used to extract it. However, urlretrieve()
> was not downloading the full file because of a bug that was corrupting
> my URL.
>
> Sorry for the confusion, and thanks to everyone for the very prompt
> help!


Just to clarify:

A tar.gz is a gzipped tar archive. It's a normal tar file, processed
into a normal gzip file.

tar.bz2 is the same, but bzip2 instead of gzip.

So, if for some reason you want to do it yourself, just decompress the
data first, then handle it like a tar file.


From kay at fiber-space.de  Sat May 16 14:51:13 2009
From: kay at fiber-space.de (Kay Schluehr)
Date: Sat, 16 May 2009 11:51:13 -0700 (PDT)
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
	<50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com> 
	<mailman.216.1242408349.8015.python-list@python.org>
	<180531ca-33aa-47b9-9c69-5b5973f6b6f9@v35g2000pro.googlegroups.com>
Message-ID: <2bad50bb-d6ad-4ec1-9d81-e66b69f2aa40@e24g2000vbe.googlegroups.com>

> Since when is a list a number? Perhaps the help needs clarification,
> in line with the docs.

Everyone is supposed to use reduce() here ;)

Kay


From arnodel at googlemail.com  Sat May 16 15:17:30 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 16 May 2009 20:17:30 +0100
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
Message-ID: <m21vqoq2lx.fsf@googlemail.com>

"Emanuele D'Arrigo" <manu3d at gmail.com> writes:

> Hi everybody,
>
> let's assume I have a module with loads of classes inheriting from one
> class, from the same module, i.e.:
>
> ## myFile.py
> class SuperClass(object)
> class SubClass1(SuperClass)
> class SubClass2(SuperClass)
> class SubClass3(SuperClass)
>
> In a separate file I also have:
>
> ## myOtherFile.py
> class NewSuperClass(object)
>
> Now, let's also assume that myFile.py cannot be changed or it's
> impractical to do so. Is there a way to replace the SuperClass at
> runtime, so that when I instantiate one of the subclasses
> NewSuperClass is used instead of the original SuperClass provided by
> the first module module?
>
> That was the generic case. Would the solution change much if
> NewSuperClass was actually inheriting from SuperClass, effectively
> wedging itself between the SuperClass and the SubClasses?
>

Here is an attempt to do this.  Imagine there is a module 'modfoo.py'
like this:

--------------------------------------------------
class Base(object):
    def bar(self):
        print 'Base.bar'
    
class A(Base):
    def bar(self): 
        Base.bar(self)
        print 'A.bar'

class B(Base):
    def bar(self):
        super(B, self).bar()
        print 'B.bar'
--------------------------------------------------

The following script will patch the module so that all subclasses of
Base in module modfoo have their new superclass changed.  I called it
'patchfoo.py'.

--------------------------------------------------
import modfoo

# This is the new base
class Wedge(modfoo.Base):
    def bar(self):
        super(Wedge, self).bar()
        print 'Wedge.bar'

# Insert Wedge into each subclass of modfoo.Base
for subclass in modfoo.Base.__subclasses__():
    if subclass.__module__ != 'modfoo': continue
    attrs = dict(item for item in subclass.__dict__.items() 
                      if item[0][:2] != '__')
    name = subclass.__name__
    setattr(modfoo, name, type(name, (Wedge,), attrs))

# Replace modfoo.Base with Wedge
modfoo.Base = Wedge

# Tests
a = modfoo.A()
b = modfoo.B()

for obj in 'a' ,'b':
        call = '%s.bar()' % (obj,)
        print '-'*5, call
        exec call
--------------------------------------------------

Now let's try it:

marigold:junk arno$ python patchfoo.py 
----- a.bar()
Base.bar
Wedge.bar
A.bar
----- b.bar()
Base.bar
Wedge.bar
B.bar

Of course, there are plenty of ways this could break.

-- 
Arnaud


From arnodel at googlemail.com  Sat May 16 15:21:37 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 16 May 2009 20:21:37 +0100
Subject: Options for creating a statistics screen on a Mac with Python?
References: <64062d1f-b500-4ba2-9365-6f169bae82af@q2g2000vbr.googlegroups.com>
	<777skeF1g4b5gU1@mid.uni-berlin.de>
	<88270345-ede7-42b6-af27-b41e79461951@m24g2000vbp.googlegroups.com>
Message-ID: <m2ws8gonum.fsf@googlemail.com>

Phillip B Oldham <phillip.oldham at gmail.com> writes:

> On May 16, 2:15?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>> matplotlib should serve you well.
>
> Thanks, I'll check that out.
>
>> Or you use some web-based solution with a javascript-based chart library.
>
> I'd rather stay away from web-based solutions; since this is going to
> be running 24/7 and has a fixed a screen size. I'd prefer something
> that has few dependencies, if possible hooking into the OS X platform
> for graphics.

* You could create a pdf/png and pipe the output through to Preview.app
  which can display it in full screen.

* A simple and portable solution may be to use pygame

-- 
Arnaud


From fetchinson at googlemail.com  Sat May 16 16:02:13 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Sat, 16 May 2009 13:02:13 -0700
Subject: How to get Exif data from a jpeg file
In-Reply-To: <m263g1pbl7.fsf@googlemail.com>
References: <m263g1pbl7.fsf@googlemail.com>
Message-ID: <fbe2e2100905161302t1888aed0vcfe022ccf5c4f2ce@mail.gmail.com>

> I need to get the creation date from a jpeg file in Python.  Googling
> brought up a several references to apparently defunct modules.  The best
> way I have been able to find so far is something like this:
>
> from PIL import Image
> img = Image.open('img.jpg')
> exif_data = img._getexif()
> creation_date = exif_data[36867]
>
> Where 36867 is the exif tag for the creation date data (which I found by
> ooking at PIL.ExifTags.TAGS).  But this doesn't even seem to be
> documented in the PIL docs.  Is there a more natural way to do this?


Have you tried http://sourceforge.net/projects/exif-py/ ?

HTH,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From aahz at pythoncraft.com  Sat May 16 16:45:52 2009
From: aahz at pythoncraft.com (Aahz)
Date: 16 May 2009 13:45:52 -0700
Subject: Difference between list() and [] with dictionaries
References: <fe3354e50905151817ie4df792hebec03ae42eca25c@mail.gmail.com>
	<mailman.247.1242441988.8015.python-list@python.org>
Message-ID: <gun8m0$qtl$1@panix3.panix.com>

In article <mailman.247.1242441988.8015.python-list at python.org>,
Ned Deily  <nad at acm.org> wrote:
>In article 
><fe3354e50905151817ie4df792hebec03ae42eca25c at mail.gmail.com>,
> Sam Tregar <sam at tregar.com> wrote:
>>
>> Can anyone explain why this creates a list containing a
>> dictionary:
>>   [{'a': 'b', 'foo': 'bar'}] 
>> But this creates a list of keys of the dictionary:
>>   list({ "a": "b", "foo": "bar" })
>
>The first example is a list, expressed as a list display literal, 
>containing one object: a dictionary, expressed as a dictionary display 
>literal.
>
>The second example is a call to the built-in function "list",  [...]

Actually, list() is not a function:

>>> list
<type 'list'>

Rather, ``list`` is an object (specifically a ``type`` object) with a
__call__() method.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From aahz at pythoncraft.com  Sat May 16 16:57:50 2009
From: aahz at pythoncraft.com (Aahz)
Date: 16 May 2009 13:57:50 -0700
Subject: Python system with exemplary organization/coding style
References: <2009051416013116807-tomfsessile@gmailcom>
Message-ID: <gun9ce$6ps$1@panix3.panix.com>

In article <2009051416013116807-tomfsessile at gmailcom>,
TomF  <tomf.sessile at gmail.com> wrote:
>
>I'm looking for a medium-sized Python system with very good coding 
>style and good code organization, so I can learn from it.  I'm reading 
>various books on Python with advice on such things but I'd prefer to 
>see a real system.
>
>By medium-sized I mean 5-20 classes, 5-20 files, etc; a code base that 
>has some complexity but isn't overwhelming.

Actually, that's what I'd call "small".  "Medium" would be about 30-50
classes (Python mostly has multiple classes per file, unlike Java, so
number of files is usally a poor measure of complexity).  Something about
the right complexity level for what you're looking for can be found in
several parts of the Python standard library, including the thread,
threading, and Queue modules (although I haven't looked at the code
recently, so I can't vouch for its quality).

Another option would be dnspython, but that's getting a bit larger than
you're looking for.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From nad at acm.org  Sat May 16 17:32:58 2009
From: nad at acm.org (Ned Deily)
Date: Sat, 16 May 2009 14:32:58 -0700
Subject: Difference between list() and [] with dictionaries
References: <fe3354e50905151817ie4df792hebec03ae42eca25c@mail.gmail.com>
	<mailman.247.1242441988.8015.python-list@python.org>
	<gun8m0$qtl$1@panix3.panix.com>
Message-ID: <nad-246ECC.14325816052009@news.gmane.org>

In article <gun8m0$qtl$1 at panix3.panix.com>, aahz at pythoncraft.com (Aahz) 
wrote:
> In article <mailman.247.1242441988.8015.python-list at python.org>,
> Ned Deily  <nad at acm.org> wrote:
> >The second example is a call to the built-in function "list",  [...]
> Actually, list() is not a function: 
> >>> list
> <type 'list'>
> Rather, ``list`` is an object (specifically a ``type`` object) with a
> __call__() method.

Yes.  However, it is also true that "list" is listed under the Built-in 
Functions section of the Python Standard Library documentation and, wrt 
to explaining the OP's issue, quacks like a function here.

-- 
 Ned Deily,
 nad at acm.org



From manu3d at gmail.com  Sat May 16 18:35:31 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Sat, 16 May 2009 15:35:31 -0700 (PDT)
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
	<m21vqoq2lx.fsf@googlemail.com>
Message-ID: <a574d4b0-f84e-49a1-b911-5395eff952e7@e23g2000vbe.googlegroups.com>

On May 16, 8:17?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
> # Insert Wedge into each subclass of modfoo.Base
> for subclass in modfoo.Base.__subclasses__():
> ? ? if subclass.__module__ != 'modfoo': continue
> ? ? attrs = dict(item for item in subclass.__dict__.items()
> ? ? ? ? ? ? ? ? ? ? ? if item[0][:2] != '__')
> ? ? name = subclass.__name__
> ? ? setattr(modfoo, name, type(name, (Wedge,), attrs))
>
> # Replace modfoo.Base with Wedge
> modfoo.Base = Wedge

That-is-neat! I'm impressed. It took me a while to understand it all:
I didn't know about __subclasses__, the way you fill the dictionary is
completely novel to me and the use of type(name, tuple, attributes)
was also completely novel to me. But eventually I got it and it's
quite neat. Thank you.

> Of course, there are plenty of ways this could break.

Uh-oh. Ok, you got me all excited and now I have to read the fine
prints. So, how can it break?

Ciao!

Manu


From robert.kern at gmail.com  Sat May 16 18:55:11 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 16 May 2009 17:55:11 -0500
Subject: Python code-bloat tool-- warning n00b stuff...
In-Reply-To: <1a3a139e0905161013p2ff1c024l260ad57433e1be20@mail.gmail.com>
References: <1a3a139e0905161013p2ff1c024l260ad57433e1be20@mail.gmail.com>
Message-ID: <gung8f$q2s$1@ger.gmane.org>

On 2009-05-16 12:13, anand j wrote:
> Hi,
>      I am looking for a bunch of rules or a tool that takes the code for
> my python class and checks the amount of code bloat and points out where
> i can improve. I am a n00b to python and built an application linking
> wordnet and graph packages. but somehow have this nagging feeling my
> code is too bloated with too many functions..... might just be paranoia
> , but worth an investigation i guess.....
>
> Sorry if this is a repeat/trivial question, I could not find any
> comprehensive links on google or the mailing list archive that is within
> my gmail. Currently, trying to download the other archives and index
> using whoosh and try searching it.

Just use Google: "site:mail.python.org code bloat tool"

But basically, such a thing doesn't really exist. It's not really a quantifiable 
concept. You can use tools like pylint to enforce a simple policy (e.g. "no more 
than 50 methods per class"), but that's not really the same thing, nor is it 
something you can't do yourself with a little bit of grepping.

A slightly more interesting and nontrivial metric that you can apply is 
cyclomatic complexity. Basically, it is the number of independent code paths 
your each function may go down.

http://en.wikipedia.org/wiki/Cyclomatic_complexity
http://www.traceback.org/2008/03/31/measuring-cyclomatic-complexity-of-python-code/

This will give a not-too-unreasonable measure of how complicated each function 
is. I don't know if that's what you are getting at with the term "code bloat".

However, there is no substitute for experienced judgment. Show your code to 
other Pythonistas. What do they think? A quick question to an experienced 
programmer is usually much more efficient than downloading a tool and trying to 
interpret its results.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From arnodel at googlemail.com  Sat May 16 19:08:27 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 17 May 2009 00:08:27 +0100
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
	<m21vqoq2lx.fsf@googlemail.com>
	<a574d4b0-f84e-49a1-b911-5395eff952e7@e23g2000vbe.googlegroups.com>
Message-ID: <m2skj4odck.fsf@googlemail.com>

"Emanuele D'Arrigo" <manu3d at gmail.com> writes:

> On May 16, 8:17?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
>> # Insert Wedge into each subclass of modfoo.Base
>> for subclass in modfoo.Base.__subclasses__():
>> ? ? if subclass.__module__ != 'modfoo': continue
>> ? ? attrs = dict(item for item in subclass.__dict__.items()
>> ? ? ? ? ? ? ? ? ? ? ? if item[0][:2] != '__')
>> ? ? name = subclass.__name__
>> ? ? setattr(modfoo, name, type(name, (Wedge,), attrs))
>>
>> # Replace modfoo.Base with Wedge
>> modfoo.Base = Wedge
>
> That-is-neat! I'm impressed. It took me a while to understand it all:
> I didn't know about __subclasses__, the way you fill the dictionary is
> completely novel to me and the use of type(name, tuple, attributes)
> was also completely novel to me. But eventually I got it and it's
> quite neat. Thank you.
>
>> Of course, there are plenty of ways this could break.
>
> Uh-oh. Ok, you got me all excited and now I have to read the fine
> prints. So, how can it break?

I can think of 3 easy ways (and there may be more):

1. For simplicity I chose to ignore attributes that start with '__' but of
course in real life some of them would need to be included (__init__ &
co...).

2. It wouldn't work with multiple inheritance.

3. If the original classes are not just defined, but also used when the
module is loaded then this will cause problems.  E.g. imagine that the
file 'modfoo.py' in my example contains the additional line

    AA = A

Then when A is patched, AA will remain bound to the original class A,
and there is not much that can be done about this.


1. and 2. are only problems because my code was proof-of-concept and can
be addressed without difficulty I think.  

3. is a more serious limitation, but if your module doesn't use the
classes (i.e. it just defines them), then the method might work OK I
guess.

-- 
Arnaud


From sjmachin at lexicon.net  Sat May 16 20:14:50 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 16 May 2009 17:14:50 -0700 (PDT)
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
	<50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com> 
	<mailman.216.1242408349.8015.python-list@python.org>
	<180531ca-33aa-47b9-9c69-5b5973f6b6f9@v35g2000pro.googlegroups.com>
	<gumm22$itv$1@panix3.panix.com>
Message-ID: <c6a17a5a-a22c-45c6-9f11-0ca6e78ad799@k9g2000pra.googlegroups.com>

On May 17, 1:28?am, a... at pythoncraft.com (Aahz) wrote:
> In article <180531ca-33aa-47b9-9c69-5b5973f6b... at v35g2000pro.googlegroups.com>,
> John Machin ?<sjmac... at lexicon.net> wrote:
> >Neat trick. However, from 2.6.2:
>
> >>>> help(sum)
> >Help on built-in function sum in module __builtin__:
>
> >sum(...)
> > ? ?sum(sequence[, start]) -> value
>
> > ? ?Returns the sum of a sequence of numbers (NOT strings) plus the
> >value
> > ? ?of parameter 'start' (which defaults to 0). ?When the sequence is
> > ? ?empty, returns start.
>
> >Since when is a list a number? Perhaps the help needs clarification,
> >in line with the docs.
>
> The primary use-case for sum() is numbers, with a special exception to
> prohibit using strings. ?Only strings are prohibited to allow using sum()
> with user-defined classes. ?That makes it a little difficult to document

Non sequitur.

> precisely in a summary; unless you can come up with a specific better
> wording, the docs will probably stay as-is. ?If you do come up with
> something better, please file it on bugs.python.org.

OK let's start with getting the docs right and then summarise that for
the help.
URI: http://docs.python.org/library/functions.html#sum
Contents:
"""
sum(iterable[, start])?

    Sums start and the items of an iterable from left to right and
returns the total. start defaults to 0. The iterable?s items are
normally numbers, and are not allowed to be strings. The fast, correct
way to concatenate a sequence of strings is by calling ''.join
(sequence). Note that sum(range(n), m) is equivalent to reduce
(operator.add, range(n), m) To add floating point values with extended
precision, see math.fsum().

    New in version 2.3
"""
Suggestions:
(1) fix what should be an apostrophe in "iterable's"
(2) s/sequence/iterable/g
(3) Either replace the sentence about "reduce" by "Note that sum
(iterable, start) is equivalent to reduce(operator.add, iterable,
start) except for the prohibition of strings" or explain why not or
what's so special about range(n).
(4) Add a full stop after the sentence about "reduce".

Help from 2.6.2:
"""
    sum(sequence[, start]) -> value

    Returns the sum of a sequence of numbers (NOT strings) plus the
value
    of parameter 'start' (which defaults to 0).  When the sequence is
    empty, returns start.
"""
Suggested replacement:
"""
    sum(iterable[, start]) -> value

    Returns the sum of the contents of the iterable plus the value
    of parameter 'start' (which defaults to 0).  When the iterable is
    empty, returns start. Strings are disallowed; use
    ''.join(iterable) to concatenate strings efficiently.
"""

Cheers,
John


From aahz at pythoncraft.com  Sat May 16 20:26:21 2009
From: aahz at pythoncraft.com (Aahz)
Date: Sat, 16 May 2009 17:26:21 -0700
Subject: Concurrency Email List
In-Reply-To: <2F8C1929-B58D-4845-A237-EFAEE8BF753D@pobox.com>
References: <2F8C1929-B58D-4845-A237-EFAEE8BF753D@pobox.com>
Message-ID: <20090517002621.GA18009@panix.com>

[posted and e-mailed]

On Sat, May 16, 2009, Pete wrote:
>
> python-concurrency at googlegroups.com is a new email list for discussion  
> of concurrency issues in python.  It arose out of Dave Beazley's class  
> on the subject last week: http://www.dabeaz.com/chicago/concurrent.html
>
> The list wills serve as a forum for discussion of such topics as:
>
> * threads
> * multiprocessing
> * asynchronous
> * coroutines
> * the GIL
>
> Hope to see you there!  Join at http://groups.google.com/group/python-concurrency/

Is there some reason you chose not to create a list on python.org?  I'm
not joining the list because Google requires that you create a login.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From ben+python at benfinney.id.au  Sat May 16 20:50:23 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 17 May 2009 10:50:23 +1000
Subject: Context manager, atexit processing, and PEP 3143 DaemonContext.close
Message-ID: <87bppsa6y8.fsf@benfinney.id.au>

Howdy all,

I'm slowly developing PEP 3143 and, in parallel, its reference
implementation, the ?python-daemon? library
<URL:http://pypi.python.org/pypi/python-daemon/>. Feedback continues to
be welcome from people wanting to make a program become a daemon; please
try it out and critique the specification and/or the implementation.

Today a flaw has been uncovered by Pavol Babin??k. In diagnosing an
issue, we doscovered that PEP 3143 currently leads, in some common
circumstances, to exiting a context manager twice.

The current specification of the `DaemonContext` class says:

=====
close()
    Return:     None

    Close the daemon context. This performs the following step:

        * If the pidfile attribute is not None, exit its context
          manager.
=====

and:

=====
__exit__(exc_type, exc_value, exc_traceback)
    Return:        True or False as defined by the context manager
    protocol

    Call the instance's close() method, then return True if the
    exception was handled or False if it was not.
=====

but also:

=====
open()
    Return:     None

    Open the daemon context, turning the current program into a daemon
    process. This performs the following steps:
[?]

        * Register the close method to be called during Python's exit
          processing.
=====


This leads to the situation where the `DaemonContext.close` method can
be called twice:

    pidfile = FunkyLockFile()
    daemon_context = daemon.DaemonContext(pidfile=pidfile)
    with daemon_context:
        main_processing()

According to the current specification, this will cause
`daemon_context.close()` to be called on exiting its context manager (at
the end of the `with` suite) *and* on program exit (via `atexit`
processing).

This will cause the `pidfile` context manager to be exited twice in
succession, which surely can't be good and is at least undefined AFAICT.


How should a context manager be implemented to handle situations like
this? One possible way is to raise an exception when trying to close a
not-open context manager. Another is to return immediately if the
attempt is made, making it safe to try closing a context manager
multiple times.

The ?Register the close method to be called during Python's exit
processing? is there to ensure clean-up occurs even if the program
isn't using the DaemonContext as a context manager. Ideally, what I'd
like to do is *un*-register the `close` method after having already
closed it, so that exit processing *won't* call it. The `atexit` module,
though, doesn't appear to give me that option.

Ideas? How should this be addressed both Pythonically and respecting the
intent of PEP 3143?

-- 
 \       ?For fast acting relief, try slowing down.? ?Jane Wagner, via |
  `\                                                       Lily Tomlin |
_o__)                                                                  |
Ben Finney


From steve at REMOVE-THIS-cybersource.com.au  Sat May 16 21:37:45 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 17 May 2009 01:37:45 GMT
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
Message-ID: <021f5d69$0$20645$c3e8da3@news.astraweb.com>

On Sat, 16 May 2009 09:55:39 -0700, Emanuele D'Arrigo wrote:

> Hi everybody,
> 
> let's assume I have a module with loads of classes inheriting from one
> class, from the same module, i.e.:
[...]
> Now, let's also assume that myFile.py cannot be changed or it's
> impractical to do so. Is there a way to replace the SuperClass at
> runtime, so that when I instantiate one of the subclasses NewSuperClass
> is used instead of the original SuperClass provided by the first module
> module?

That's called "monkey patching" or "duck punching".

http://en.wikipedia.org/wiki/Monkey_patch

http://wiki.zope.org/zope2/MonkeyPatch

http://everything2.com/title/monkey%2520patch



-- 
Steven


From thomas.vogel at likeabird.de  Sat May 16 21:52:46 2009
From: thomas.vogel at likeabird.de (Thomas Vogel)
Date: Sun, 17 May 2009 03:52:46 +0200
Subject: UDP reading on multiple sockets
Message-ID: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net>

Hi all,

I'm currently have the problem that I try to read UDP messages from 
multiple sockets in parallel. So let's say I get UDP packets from the 
same IP on the ports 2000, 2001, 2002,...

Therefore I created the following class.
But if I try to instantiate it several times with different ports I 
experience that if I get a broadcast message all ports are waking up, 
the 1st socket is using the message and the others close itself as the 
buffer is empty.

Does anybody have an idea how to do this in a better way?
I just need non-blocking UDP-receiver that are listening on several 
ports in parallel and return me the incomming messages. Are there 
examples in the net that describe this problem?

class Receiver(asyncore.dispatcher, threading.Thread):
     '''
     This is the command receiver entity.
     '''

     def __init__(self, api, localIp, localPort):

         asyncore.dispatcher.__init__(self)
         threading.Thread.__init__(self)
         self.create_socket(socket.AF_INET, socket.SOCK_DGRAM)
         self.bind((localIp, localPort))
         self.cv = threading.Condition()
         self.data = []
         self.sorbasApi = api

     def handle_connect(self):
         return

     def writable(self):
         return False

     def handle_error(self):
         self.logger.error('error')
         return asyncore.dispatcher.handle_error(self)

     def handle_read(self):
         s = self.recv(4096)
         self.cv.acquire()
         self.data.append(s)
         self.cv.notifyAll()
         self.cv.release()

     def handle_close(self):
         self.close()

     def run(self):
         asyncore.loop()

     def flush(self):
         self.data = []

     def readNextMsg(self, paramSet, timeout=1):
         if len(self.data) == 0:
             self.cv.acquire()
             self.cv.wait(timeout)
             self.cv.release()
         if len(self.data) > 0:
             buffer = array('B', self.data.pop(0)).tolist()
             m = ReceiveMessage(self.sorbasApi, paramSet)
             m.decode(buffer)
             return m
         else:
             return None

     def __del__(self):
         self.close()

Thanks a lot in advance
Thomas


From grante at visi.com  Sat May 16 22:22:25 2009
From: grante at visi.com (Grant Edwards)
Date: Sat, 16 May 2009 21:22:25 -0500
Subject: UDP reading on multiple sockets
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net>
Message-ID: <15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>

On 2009-05-17, Thomas Vogel <thomas.vogel at likeabird.de> wrote:

> I'm currently have the problem that I try to read UDP messages from 
> multiple sockets in parallel. So let's say I get UDP packets from the 
> same IP on the ports 2000, 2001, 2002,...

Is there any reason you can't do it the easy way by using
select?

http://docs.python.org/library/select.html

-- 
Grant



From pavlovevidence at gmail.com  Sat May 16 23:01:31 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 16 May 2009 20:01:31 -0700 (PDT)
Subject: Context manager, atexit processing, and PEP 3143 
	DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
Message-ID: <d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>

On May 16, 5:50?pm, Ben Finney <ben+pyt... at benfinney.id.au> wrote:
> Ideas? How should this be addressed both Pythonically and respecting the
> intent of PEP 3143?


There's already precedent for what to do in the Python library.

Python 2.5.2 (r252:60911, Jan  4 2009, 17:40:26)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> f = open('somefile')
>>> f.close()
>>> f.close()
>>> f.close()
>>> f.close()


Is a context manager really necessary here?  It's not like daemon
processes can reattach themselves to the terminal when they're done
being a daemon.  What's the use case for being able to partially clean
up before program exit?


Carl Banks


From ben+python at benfinney.id.au  Sat May 16 23:20:39 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 17 May 2009 13:20:39 +1000
Subject: Context manager, atexit processing,
	and PEP 3143  DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
Message-ID: <87tz3k8lfc.fsf@benfinney.id.au>

Carl Banks <pavlovevidence at gmail.com> writes:

> There's already precedent for what to do in the Python library.
> 
> Python 2.5.2 (r252:60911, Jan  4 2009, 17:40:26)
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> f = open('somefile')
> >>> f.close()
> >>> f.close()
> >>> f.close()
> >>> f.close()

Yes, that's a precedent in favour of ?silently return immediately when
closing an already-closed DaemonContext?. I'm not about to assume that
it's the *only* relevant precedent.

> Is a context manager really necessary here? It's not like daemon
> processes can reattach themselves to the terminal when they're done
> being a daemon. What's the use case for being able to partially clean
> up before program exit?

The use case is::

    pidfile = MyChoiceOfLockFile()
    daemon_context = daemon.DaemonContext(pidfile=pidfile)

    with daemon_context:
        do_main_processing()

which could easily become something like::

    beans_resource = crunchy_init()

    with beans_resource:

        spam_resource = crispy_init()

        pidfile = MyChoiceOfLockFile()
        daemon_context = daemon.DaemonContext(pidfile=pidfile)

        with daemon_context:
            do_main_processing()

        spam_resource.cleanup()

In other words, the DaemonContext has a specific job, and is easier to
use if it can be relied on to clean up its own stuff via a context
manager; but the larger program could easily have other things (in the
example above, both of `spam_resource` and `beans_resource`) it needs to
clean up apart from just the daemon context.

-- 
 \     ?We reserve the right to serve refuse to anyone. ? ?restaurant, |
  `\                                                             Japan |
_o__)                                                                  |
Ben Finney


From rtomek at ceti.com.pl  Sat May 16 23:32:46 2009
From: rtomek at ceti.com.pl (Tomasz Rola)
Date: Sun, 17 May 2009 05:32:46 +0200
Subject: Nimrod programming language
In-Reply-To: <f8dfc0a0-8f8e-4f54-ab45-2ae4e5e60bfe@t11g2000vbc.googlegroups.com>
References: <159308160@web.de>
	<mailman.5390.1241977162.11746.python-list@python.org>
	<d201b2cb-4b13-4970-a44b-9be1b553e293@j12g2000vbl.googlegroups.com> 
	<Pine.LNX.4.64.0905120140001.2367@tau.ceti.pl>
	<f8dfc0a0-8f8e-4f54-ab45-2ae4e5e60bfe@t11g2000vbc.googlegroups.com>
Message-ID: <Pine.LNX.4.64.0905170458330.24790@tau.ceti.pl>

On Mon, 11 May 2009, kay at fiber-space.de wrote:

> On 12 Mai, 02:10, Tomasz Rola <rto... at ceti.com.pl> wrote:
> > On Mon, 11 May 2009, rump... at web.de wrote:
> > > > One question I ask myself upon seeing a new language is if it is possible
> > > > to program amb (amb=ambiguous) operator in it. This page gives a very
> > > > nice, "code first" explanation of amb and how it is supposed to work:
> >
> > > >http://www.randomhacks.net/articles/2005/10/11/amb-operator
> >
> > > Hm. I am not sure either. To me, it looks like a constraint solver by
> > > using brute force.
> >
> > Yes, kind of. From what I understand [1], it's goal is to simulate
> > nondeterministic "get right answer in one try", only this "one try"
> > requires browsing the solution space (because we have only "classic"
> > hardware). It is easy to use amb in wrong way, but I can see some cases
> > when I would like it.
> 
> In Python you can use a generator expression. Dan Piponis example can
> be stated as
> 
> g = ((i,j) for i in range(2,100) for j in range(2,i) if i*j == 481)
> 
> which doesn't require any call/cc hacks but is a deterministic "get
> right in one try". Once Nimrod has coroutines it's just a matter of
> sugaring them into comprehensions.

Yep, to be frank everything complicated can be achieved by means of a 
"for" loop (so said one friend of mine, and this is dirty, dirty way of 
thinking). Or putting generators in a row... but try to do this trick 
with ten of them and things start to look messy. Or ugly. Or both - and I 
don't like neither.

There is another example, below Don Piponis' one. I like the look of 
simplicity. I don't like ten or seven nested loops, that would have been 
used instead. Perhaps amb could be somehow simulated with recursion, but 
to use recursion in a language, I need to know it is safe and doesn't 
overflow on 50th call. So, either I use the language that allows me to 
express things in a way appealing to my taste, or I use something else and 
perhaps end up with nested loops.

Besides, having search space defined with amb-statements may allow me to 
try other ideas than brute-force search. Like, say, genetic algorithm 
under the hood. No change to program, just link with other library (import 
amb's definition from other path etc). I cannot imagine trying such trick 
with nested loops without writing new program (writing new loop(s)).

Generators don't give me nice looking alternative to amb. So, if the 
problem requires two or three nested loops, ok, I can go for it. If more - 
I want another way out. Just my personal opinion, not forcing anybody to 
follow.

However, the question I wanted to be answered, was how far Nimrod would 
allow me to go. I've got my answer and, well, for some near future I will 
just sit and see what happens. So, discussing amb's usefulness or if the 
same ca be done with whatever else is not very interesting, because of 
course everything can be done with loops - no need for continuations, 
coroutines, recursion, macros etc.

Regards
Tomasz Rola

--
** A C programmer asked whether computer had Buddha's nature.      **
** As the answer, master did "rm -rif" on the programmer's home    **
** directory. And then the C programmer became enlightened...      **
**                                                                 **
** Tomasz Rola          mailto:tomasz_rola at bigfoot.com             **


From robin at alldunn.com  Sun May 17 01:31:08 2009
From: robin at alldunn.com (Robin Dunn)
Date: Sat, 16 May 2009 22:31:08 -0700
Subject: ANN: wxPython 2.8.10.1
Message-ID: <4A0FA11C.6000807@alldunn.com>

Announcing
----------

The 2.8.10.1 release of wxPython is now available for download at
http://wxpython.org/download.php.  This release fixes the problem with 
using Python 2.6's default manifest, and updates wxcairo to work with 
the latest PyCairo.  A summary of changes is listed below and also
at http://wxpython.org/recentchanges.php.

Source code is available as a tarball and a source RPM, as well as
binaries for Python 2.4, 2.5 and 2.6, for Windows and Mac, as well
some packages for various Linux distributions.



What is wxPython?
-----------------

wxPython is a GUI toolkit for the Python programming language. It
allows Python programmers to create programs with a robust, highly
functional graphical user interface, simply and easily. It is
implemented as a Python extension module that wraps the GUI components
of the popular wxWidgets cross platform library, which is written in
C++.

wxPython is a cross-platform toolkit. This means that the same program
will usually run on multiple platforms without modifications.
Currently supported platforms are 32-bit and 64-bit Microsoft Windows,
most Linux or other Unix-like systems using GTK2, and Mac OS X 10.4+.
In most cases the native widgets are used on each platform to provide
a 100% native look and feel for the application.



Changes in 2.8.10.1
-------------------

wx.grid.Grid:  Added methods CalcRowLabelsExposed,
CalcColLabelsExposed, CalcCellsExposed, DrawRowLabels, DrawRowLabel,
DrawColLabels, and DrawColLabel to the Grid class.

Added the wx.lib.mixins.gridlabelrenderer module.  It enables the use
of label renderers for Grids that work like the cell renderers do.  See
the demo for a simple sample.

Solved the manifests problem with Python 2.6 on Windows.  wxPython now
programatically creates its own activation context and loads a
manifest in that context that specifies the use of the themable common
controls on Windows XP and beyond.  This also means that the external
manifest files are no longer needed for the other versions of Python.

wx.Colour: Updated the wx.Colour typemaps and also the wx.NamedColour
constructor to optionally allow an alpha value to be passed in the
color string, using these syntaxes:  "#RRGGBBAA" or "ColourName:AA"

wx.lib.wxcairo:  Fixed a problem resulting from PyCairo changing the
layout of their C API structure in a non-binary compatible way.  The
new wx.lib.wxcairo is known to now work with PyCairo 1.6.4 and 1.8.4,
and new binaries for Windows are available online at
http://wxpython.org/cairo/

-- 
Robin Dunn
Software Craftsman
http://wxPython.org



From pavlovevidence at gmail.com  Sun May 17 01:33:47 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 16 May 2009 22:33:47 -0700 (PDT)
Subject: Context manager, atexit processing, and PEP 3143 
	DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
Message-ID: <70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>

On May 16, 8:20?pm, Ben Finney <ben+pyt... at benfinney.id.au> wrote:
> Carl Banks <pavlovevide... at gmail.com> writes:
> > There's already precedent for what to do in the Python library.
>
> > Python 2.5.2 (r252:60911, Jan ?4 2009, 17:40:26)
> > [GCC 4.3.2] on linux2
> > Type "help", "copyright", "credits" or "license" for more information.
> > >>> f = open('somefile')
> > >>> f.close()
> > >>> f.close()
> > >>> f.close()
> > >>> f.close()
>
> Yes, that's a precedent in favour of ?silently return immediately when
> closing an already-closed DaemonContext?. I'm not about to assume that
> it's the *only* relevant precedent.

I don't think this is anything more than a trivial consideration,
which should warrant nothing more than the simplest solution possible,
which is to simply allow multiple clean up calls.

That one of Python's most fundamental types allows its clean-up
operation to be invoked safely on an already-cleaned up object is
precedent enough, given the triviality of the issue.

You're welcome to your own assessment of the problem's importance.


Carl Banks


From gagsl-py2 at yahoo.com.ar  Sun May 17 01:41:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 17 May 2009 02:41:21 -0300
Subject: KeyboardInterrupt catch does not shut down the socketserver
References: <mailman.183.1242371089.8015.python-list@python.org>
	<guj8dv$5sl$2@lust.ihug.co.nz>
	<mailman.185.1242375959.8015.python-list@python.org>
	<gujl41$d0r$2@lust.ihug.co.nz> <4A0D5A35.3010008@gmail.com>
	<op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>
	<4A0E6563.2070400@gmail.com>
Message-ID: <op.ut17e7twx6zn5v@gabriel.sleipnir-bsas>

En Sat, 16 May 2009 04:04:03 -0300, Igor Katson <descentspb at gmail.com>  
escribi?:
> Gabriel Genellina wrote:
>> En Fri, 15 May 2009 09:04:05 -0300, Igor Katson escribi?:
>>> Lawrence D'Oliveiro wrote:
>>>> In message <mailman.185.1242375959.8015.python-list at python.org>, Igor  
>>>> Katson wrote:
>>>>> Lawrence D'Oliveiro wrote:
>>>>>> In message <mailman.183.1242371089.8015.python-list at python.org>,  
>>>>>> Igor Katson wrote:
>>>>>>
>>>>>>> I have problems in getting a SocketServer to shutdown.
>>> Shutdown implies closing the listening socket, doesn't it?
>>
>> No (perhaps it should, but that is another issue). There is a
>> documentation bug; BaseServer.shutdown is documented as "Tells the
>> serve_forever() loop to stop and waits until it does." [1]
>> The docstring is much more explicit: """Stops the serve_forever loop.
>> Blocks until the loop has finished. This must be called while
>> serve_forever() is running in another thread, or it will deadlock."""
>>
>> So, if you have a single-threaded server, *don't* use shutdown(). And,  
>> to orderly close the listening socket, use server_close() instead. Your

> Hmm. Gabriel, could you please show the same for the threaded version?  
> This one deadlocks:
> [code removed]

The shutdown method should *only* be called while serve_forever is  
running. If called after server_forever exited, shutdown() blocks forever.

<code>
 from SocketServer import TCPServer, BaseRequestHandler
 from threading import Thread

server = TCPServer(('localhost',1234), BaseRequestHandler)
run_thread = Thread(target=server.serve_forever)
run_thread.start()
try:
     print "press ^C to exit"
     import time; time.sleep(30)
except KeyboardInterrupt:
     print "^C detected"
     pass
server.shutdown()
run_thread.join()
print "bye"
</code>

But, what are you after, exactly? I think I'd use the above code only in a  
GUI application with a background server.
There are other alternatives, like asyncore or Twisted.

-- 
Gabriel Genellina



From ben+python at benfinney.id.au  Sun May 17 01:46:22 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 17 May 2009 15:46:22 +1000
Subject: Context manager, atexit processing,
	and PEP 3143  DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>
Message-ID: <87hbzk8eoh.fsf@benfinney.id.au>

Carl Banks <pavlovevidence at gmail.com> writes:

> I don't think this is anything more than a trivial consideration,

Okay, thank you.

Anyone else?

-- 
 \         ?All television is educational television. The question is: |
  `\                           what is it teaching?? ?Nicholas Johnson |
_o__)                                                                  |
Ben Finney


From tjreedy at udel.edu  Sun May 17 02:08:01 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 17 May 2009 02:08:01 -0400
Subject: Swapping superclass from a module
In-Reply-To: <021f5d69$0$20645$c3e8da3@news.astraweb.com>
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
	<021f5d69$0$20645$c3e8da3@news.astraweb.com>
Message-ID: <guo9k1$6vp$1@ger.gmane.org>

Steven D'Aprano wrote:
> On Sat, 16 May 2009 09:55:39 -0700, Emanuele D'Arrigo wrote:
> 
>> Hi everybody,
>>
>> let's assume I have a module with loads of classes inheriting from one
>> class, from the same module, i.e.:
> [...]
>> Now, let's also assume that myFile.py cannot be changed or it's
>> impractical to do so. Is there a way to replace the SuperClass at
>> runtime, so that when I instantiate one of the subclasses NewSuperClass
>> is used instead of the original SuperClass provided by the first module
>> module?
> 
> That's called "monkey patching" or "duck punching".
> 
> http://en.wikipedia.org/wiki/Monkey_patch
> 
> http://wiki.zope.org/zope2/MonkeyPatch
> 
> http://everything2.com/title/monkey%2520patch

If the names of superclasses is resolved when classes are instantiated, 
the patching is easy.  If, as I would suspect, the names are resolved 
when the classes are created, before the module becomes available to the 
importing code, then much more careful and extensive patching would be 
required, if it is even possible.  (Objects in tuples cannot be 
replaced, and some attributes are not writable.)

tjr



From michele.simionato at gmail.com  Sun May 17 02:54:20 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Sat, 16 May 2009 23:54:20 -0700 (PDT)
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
Message-ID: <8c92fb11-1d62-43fb-9082-ef890bd16f5e@l32g2000vba.googlegroups.com>

Try this:

class Base(object):
    pass

class C(Base):
    pass

class NewBase(object):
    pass

C.__bases__ = (NewBase,)

help(C)


From rustompmody at gmail.com  Sun May 17 03:09:39 2009
From: rustompmody at gmail.com (rustom)
Date: Sun, 17 May 2009 00:09:39 -0700 (PDT)
Subject: using urlretrive/urlopen
References: <f46c52560905150803i15ad7968m5fc13738906f8e7d@mail.gmail.com> 
	<mailman.242.1242437704.8015.python-list@python.org>
Message-ID: <9153b54b-8cd8-4d7a-b7a7-46b90f9c5367@j18g2000prm.googlegroups.com>

On May 16, 6:30?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Fri, 15 May 2009 12:03:09 -0300, Rustom Mody <rustompm... at gmail.com> ?
> escribi?:
>
> > I am trying to talk to a server that runs on localhost
> > The server runs onhttp://localhost:7000/and that opens alright in? a
> > web browser.
>
> > However if I use urlopen or urlretrieve what I get is this 'file' --
> > obviously not the one that the browser gets:
>
> > <html><body bgcolor="#ffffff">
> > Query 'http://localhost:7000/'not implemented
> > </body></html>
> > Any tips/clues?
>
> Please post the code you're using to access the server.
> Do you have any proxy set up?
>
> --
> Gabriel Genellina

Thanks Gabriel!

urlopen("http://localhost:7000", proxies={})
seems to be what I needed.


From __peter__ at web.de  Sun May 17 03:24:32 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 17 May 2009 09:24:32 +0200
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
	<021f5d69$0$20645$c3e8da3@news.astraweb.com>
	<mailman.272.1242540495.8015.python-list@python.org>
Message-ID: <guoe2u$ra8$02$1@news.t-online.com>

Terry Reedy wrote:

> Steven D'Aprano wrote:
>> On Sat, 16 May 2009 09:55:39 -0700, Emanuele D'Arrigo wrote:
>> 
>>> Hi everybody,
>>>
>>> let's assume I have a module with loads of classes inheriting from one
>>> class, from the same module, i.e.:
>> [...]
>>> Now, let's also assume that myFile.py cannot be changed or it's
>>> impractical to do so. Is there a way to replace the SuperClass at
>>> runtime, so that when I instantiate one of the subclasses NewSuperClass
>>> is used instead of the original SuperClass provided by the first module
>>> module?
>> 
>> That's called "monkey patching" or "duck punching".
>> 
>> http://en.wikipedia.org/wiki/Monkey_patch
>> 
>> http://wiki.zope.org/zope2/MonkeyPatch
>> 
>> http://everything2.com/title/monkey%2520patch
> 
> If the names of superclasses is resolved when classes are instantiated,
> the patching is easy.  If, as I would suspect, the names are resolved
> when the classes are created, before the module becomes available to the
> importing code, then much more careful and extensive patching would be
> required, if it is even possible.  (Objects in tuples cannot be
> replaced, and some attributes are not writable.)

It may be sufficient to patch the subclasses:

$ cat my_file.py
class Super(object):
    def __str__(self):
        return "old"

class Sub(Super):
    def __str__(self):
        return "Sub(%s)" % super(Sub, self).__str__()

class Other(object):
    pass

class SubSub(Sub, Other):
    def __str__(self):
        return "SubSub(%s)" % super(SubSub, self).__str__()

if __name__ == "__main__":
    print Sub()

$ cat main2.py
import my_file
OldSuper = my_file.Super

class NewSuper(OldSuper):
    def __str__(self):
        return "new" + super(NewSuper, self).__str__()

my_file.Super = NewSuper
for n, v in vars(my_file).iteritems():
    if v is not NewSuper:
        try:
            bases = v.__bases__
        except AttributeError:
            pass
        else:
            if OldSuper in bases:
                print "patching", n
                v.__bases__ = tuple(NewSuper if b is OldSuper else b
                                    for b in bases)


print my_file.Sub()
print my_file.SubSub()
$ python main2.py
patching Sub
Sub(newold)
SubSub(Sub(newold))

Peter



From arnodel at googlemail.com  Sun May 17 04:17:06 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 17 May 2009 09:17:06 +0100
Subject: How to get Exif data from a jpeg file
References: <m263g1pbl7.fsf@googlemail.com>
	<mailman.265.1242504138.8015.python-list@python.org>
Message-ID: <m2octsnny5.fsf@googlemail.com>

Daniel Fetchinson <fetchinson at googlemail.com> writes:

>> I need to get the creation date from a jpeg file in Python.  Googling
>> brought up a several references to apparently defunct modules.  The best
>> way I have been able to find so far is something like this:
>>
>> from PIL import Image
>> img = Image.open('img.jpg')
>> exif_data = img._getexif()
>> creation_date = exif_data[36867]
>>
>> Where 36867 is the exif tag for the creation date data (which I found by
>> ooking at PIL.ExifTags.TAGS).  But this doesn't even seem to be
>> documented in the PIL docs.  Is there a more natural way to do this?
>
>
> Have you tried http://sourceforge.net/projects/exif-py/ ?
>
> HTH,
> Daniel

I will have a look - thank you.

-- 
Arnaud


From descentspb at gmail.com  Sun May 17 04:20:33 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sun, 17 May 2009 12:20:33 +0400
Subject: KeyboardInterrupt catch does not shut down the socketserver
In-Reply-To: <op.ut17e7twx6zn5v@gabriel.sleipnir-bsas>
References: <mailman.183.1242371089.8015.python-list@python.org>	<guj8dv$5sl$2@lust.ihug.co.nz>	<mailman.185.1242375959.8015.python-list@python.org>	<gujl41$d0r$2@lust.ihug.co.nz>
	<4A0D5A35.3010008@gmail.com>	<op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>	<4A0E6563.2070400@gmail.com>
	<op.ut17e7twx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <4A0FC8D1.1020303@gmail.com>

Gabriel Genellina wrote:
> En Sat, 16 May 2009 04:04:03 -0300, Igor Katson <descentspb at gmail.com> 
> escribi?:
>> Gabriel Genellina wrote:
>>> En Fri, 15 May 2009 09:04:05 -0300, Igor Katson escribi?:
>>>> Lawrence D'Oliveiro wrote:
>>>>> In message <mailman.185.1242375959.8015.python-list at python.org>, 
>>>>> Igor Katson wrote:
>>>>>> Lawrence D'Oliveiro wrote:
>>>>>>> In message <mailman.183.1242371089.8015.python-list at python.org>, 
>>>>>>> Igor Katson wrote:
>>>>>>>
>>>>>>>> I have problems in getting a SocketServer to shutdown.
>>>> Shutdown implies closing the listening socket, doesn't it?
>>>
>>> No (perhaps it should, but that is another issue). There is a
>>> documentation bug; BaseServer.shutdown is documented as "Tells the
>>> serve_forever() loop to stop and waits until it does." [1]
>>> The docstring is much more explicit: """Stops the serve_forever loop.
>>> Blocks until the loop has finished. This must be called while
>>> serve_forever() is running in another thread, or it will deadlock."""
>>>
>>> So, if you have a single-threaded server, *don't* use shutdown(). 
>>> And, to orderly close the listening socket, use server_close() 
>>> instead. Your
>
>> Hmm. Gabriel, could you please show the same for the threaded 
>> version? This one deadlocks:
>> [code removed]
>
> The shutdown method should *only* be called while serve_forever is 
> running. If called after server_forever exited, shutdown() blocks 
> forever.
>
> [code removed]
> But, what are you after, exactly? I think I'd use the above code only 
> in a GUI application with a background server.
> There are other alternatives, like asyncore or Twisted.
For now, I am just using server.server_close() and it works. The server 
itself is an external transaction manager for PostgreSQL, when a client 
connects to it, serialized data interchange beetween the server and the 
client starts, e.g. first the client sends data, then the server sends 
data, then again the client, then the server and so on.
I haven't used asyncore or Twisted yet, and didn't know about their 
possible usage while writing the project. I'll research in that direction.



From davidb at panix.com  Sun May 17 05:22:24 2009
From: davidb at panix.com (David M. Besonen)
Date: Sun, 17 May 2009 02:22:24 -0700
Subject: Concurrency Email List
In-Reply-To: <20090517002621.GA18009@panix.com>
References: <2F8C1929-B58D-4845-A237-EFAEE8BF753D@pobox.com>
	<20090517002621.GA18009@panix.com>
Message-ID: <4A0FD750.7080909@panix.com>

On 5/16/2009 5:26 PM, Aahz wrote:

> On Sat, May 16, 2009, Pete wrote:
>
>> python-concurrency at googlegroups.com is a new email list
>> for discussion of concurrency issues in python.
>
> Is there some reason you chose not to create a list on
> python.org?  I'm not joining the list because Google
> requires that you create a login.

i too would join if it was hosted at python.org, and will not
if it's hosted at google for the same reason.


  -- david



From nytrokiss at gmail.com  Sun May 17 05:39:54 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 17 May 2009 12:39:54 +0300
Subject: Concurrency Email List
In-Reply-To: <4A0FD750.7080909@panix.com>
References: <2F8C1929-B58D-4845-A237-EFAEE8BF753D@pobox.com>
	<20090517002621.GA18009@panix.com> <4A0FD750.7080909@panix.com>
Message-ID: <8a6b8e350905170239i5f0fb8et33ce201edea60bca@mail.gmail.com>

I second this. Google groups are annoying! Just request that it be added to
python.org

James

On Sun, May 17, 2009 at 12:22 PM, David M. Besonen <davidb at panix.com> wrote:

> On 5/16/2009 5:26 PM, Aahz wrote:
>
> > On Sat, May 16, 2009, Pete wrote:
> >
> >> python-concurrency at googlegroups.com is a new email list
> >> for discussion of concurrency issues in python.
> >
> > Is there some reason you chose not to create a list on
> > python.org?  I'm not joining the list because Google
> > requires that you create a login.
>
> i too would join if it was hosted at python.org, and will not
> if it's hosted at google for the same reason.
>
>
>  -- david
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 

http://www.goldwatches.com/
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From nytrokiss at gmail.com  Sun May 17 05:46:24 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 17 May 2009 12:46:24 +0300
Subject: Your Favorite Python Book
In-Reply-To: <pecora-532361.12051215052009@ra.nrl.navy.mil>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<mailman.6.1242078341.8015.python-list@python.org>
	<e1db4ac7-4997-401b-9a1f-112787a9ed92@r3g2000vbp.googlegroups.com>
	<pecora-532361.12051215052009@ra.nrl.navy.mil>
Message-ID: <8a6b8e350905170246r30b374e6m70cf1de58962b7a8@mail.gmail.com>

For me it's any book on Django, Core Python 2nd Edition (which I will buy if
updated) and Python Power.



On Fri, May 15, 2009 at 7:05 PM, Lou Pecora <pecora at anvil.nrl.navy.mil>wrote:

> In article
> <e1db4ac7-4997-401b-9a1f-112787a9ed92 at r3g2000vbp.googlegroups.com>,
>  Mike Driscoll <kyosohma at gmail.com> wrote:
>
> > On May 11, 4:45 pm, Chris Rebert <c... at rebertia.com> wrote:
>
> > >
> > > I like "Python in a Nutshell" as a reference book, although it's now
> > > slightly outdated given Python 3.0's release (the book is circa 2.5).
> > >
> > > Cheers,
> > > Chris
>
> "Python in a Nutshell" -- Absolutely!  Covers a lot in an easily
> accessible way.  The first book I reach for.  I hope Martelli updates it
> to 3.0.
>
> --
> -- Lou Pecora
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
http://www.goldwatches.com
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From nytrokiss at gmail.com  Sun May 17 05:51:55 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 17 May 2009 12:51:55 +0300
Subject: Generic web parser
In-Reply-To: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
References: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
Message-ID: <8a6b8e350905170251ja767e54w978ccb077626e282@mail.gmail.com>

I don't see the issue of using urllib and Sqllite for everything you mention
here.

On Sat, May 16, 2009 at 4:18 PM, S.Selvam <s.selvamsiva at gmail.com> wrote:

> Hi all,
>
> I have to design web parser which will visit the given list of websites and
> need to fetch a particular set of details.
> It has to be so generic that even if we add new websites, it must fetch
> those details if available anywhere.
> So it must be something like a framework.
>
> Though i have done some parsers ,but they will parse for a given
> format(For. eg It will get the data from <title> tag).But here each website
> may have different format and the information may available within any tags.
>
> I know its a tough task for me,but i feel with python it should be
> possible.
> My request is, if such thing is already available please let me know ,also
> your suggestions are welcome.
>
> Note: I planned to use BeautifulSoup for parsing.
>
> --
> Yours,
> S.Selvam
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
http://www.goldwatches.com
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From stef.mientki at gmail.com  Sun May 17 06:11:20 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 17 May 2009 12:11:20 +0200
Subject: os.path.split gets confused with combined \\ and /
Message-ID: <4A0FE2C8.6030600@gmail.com>

hello,

just wonder how others solve this problem:
I've to distribute both python files and data files.
Everything is developed under windows and now the datafiles contains 
paths with mixed \\ and /.
Under windows everthing is working well,
but under Ubuntu / Fedora sometimes strange errors occurs.
Now I was thinking that using os.path.split would solve all problems,
but if I've the following relative path

    path1/path2\\filename.dat

split will deliver the following under windows
   path = path1 / path2
   filename = filename.dat

while under Linux it will give me
   path = path1
   filename = path\\filename.dat

So I'm now planning to replace all occurences of os.path.split with a 
call to the following function

def path_split ( filename ) :
    # under Ubuntu a filename with both
    # forward and backward slashes seems to give trouble
    # already in os.path.split
    filename = filename.replace ( '\\','/')

    return os.path.split ( filename )

how do others solve this problem ?
Are there better ways to solve this problem ?

thanks,
Stef Mientki


From clp2 at rebertia.com  Sun May 17 06:15:59 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 17 May 2009 03:15:59 -0700
Subject: os.path.split gets confused with combined \\ and /
In-Reply-To: <4A0FE2C8.6030600@gmail.com>
References: <4A0FE2C8.6030600@gmail.com>
Message-ID: <50697b2c0905170315w4f2f6e6ax15728a614df32ec0@mail.gmail.com>

On Sun, May 17, 2009 at 3:11 AM, Stef Mientki <stef.mientki at gmail.com> wrote:
> hello,
>
> just wonder how others solve this problem:
> I've to distribute both python files and data files.
> Everything is developed under windows and now the datafiles contains paths
> with mixed \\ and /.
> Under windows everthing is working well,
> but under Ubuntu / Fedora sometimes strange errors occurs.
> Now I was thinking that using os.path.split would solve all problems,
> but if I've the following relative path
>
> ? path1/path2\\filename.dat
>
> split will deliver the following under windows
> ?path = path1 / path2
> ?filename = filename.dat
>
> while under Linux it will give me
> ?path = path1
> ?filename = path\\filename.dat
>
> So I'm now planning to replace all occurences of os.path.split with a call
> to the following function
>
> def path_split ( filename ) :
> ? # under Ubuntu a filename with both
> ? # forward and backward slashes seems to give trouble
> ? # already in os.path.split
> ? filename = filename.replace ( '\\','/')
>
> ? return os.path.split ( filename )
>
> how do others solve this problem ?
> Are there better ways to solve this problem ?

Just always use forward-slashes for paths in the first place since
they work on both platforms.
But your technique seems a reasonable way of dealing with mixed-up
datafiles, since you're in that situation.

Cheers,
Chris
-- 
http://blog.rebertia.com


From fthtmn at gmail.com  Sun May 17 06:18:07 2009
From: fthtmn at gmail.com (Fatih Tumen)
Date: Sun, 17 May 2009 13:18:07 +0300
Subject: python and samba
Message-ID: <67224dac0905170318h38912152y1d42625ebafc1be9@mail.gmail.com>

Hi,
I am working on a directory synchronisation tool for Linux.

$ gcc --version
gcc (GCC) 4.2.4 (Ubuntu 4.2.4-1ubuntu3)
$ python -V
Python 2.5.2
$ smbclient --version
Version 3.0.28a

I first designed it to work on the local filesystem. I am using filecmp.py
(distributed with Python) for comparing the files. Of course I had to
modify it in a way that it will return object rather than stdout. I have
this compare method in my main class which is os.walk()-ing through
the directories and labeling the files on the GUI according to this returned

object by filecmp.py.
Now I want add support for syncing between (unix and NT) network
shares without having to change my abstraction much. At first googling
I hit a samba discussion appeared on this list ages ago. It did not help me
much though. I also found this pysmbc, libsmbclient bindings, written by
Tim Waug but it requires libsmbclient-3.2.x. which requires
libc6 >= 2.8~20080505 which comes with Intreprid but I have reasons
not to upgrade my Hardy.
Another thing I found was pysamba, by Juan M. Casillas,  but it needs
a bit of hack; samba needs to be configured with python.
I am looking for something that won't bother the end user nor me. I want
to keep it as simple as possible. I will distribute the libraries myself if
I have
to and if licence is not an issue.

If I have to summarise, I need to get m_time and size (and preferably stick
with
os.walk and filecmp.py if possible) and copy files back and forth using
samba (unix <-> NT).  I don't wanna reinvent the wheel or overengineer
anything but if I can do this without any additional libraries, great!

I would appreciate any advice on this.
Thanks..
-- 
   Fatih
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From fthtmn at gmail.com  Sun May 17 06:18:34 2009
From: fthtmn at gmail.com (Fatih Tumen)
Date: Sun, 17 May 2009 13:18:34 +0300
Subject: filecmp.py licensing
Message-ID: <67224dac0905170318k433a345bp9fd9cd2ec50a17f3@mail.gmail.com>

Hi,
As I mentioned on the other thread about samba, I am working on a
synchronisation project and using filecmp.py for comparing files. I
modified it according to my needs and planning to distribute it with my
package. At first glance it seems that filecmp.py is a part of Python
package. Though I don't see a licence header on the file I assume that
it is licensed under PSFL. I will distribute my project with GNU GPL or
Creative Commons BY-NC-SA. My question is if I renamed it and
put the Python attribution on the header, would it be alright?

What is the proper way of doing this?
-- 
   Fatih
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From manu3d at gmail.com  Sun May 17 06:19:49 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Sun, 17 May 2009 03:19:49 -0700 (PDT)
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
Message-ID: <9a6bfcc1-4ab8-40bd-94f0-bd99a217797f@s20g2000vbp.googlegroups.com>

Wow, thank you all. Lots of ideas and things to try! I wish I knew
which one is going to work best. The module I'm trying to (monkey!)
patch is pxdom, and as it is a bit long (5700 lines of code.... in one
file!) I'm not quite sure if the simplest patching method will work or
the more complicated ones are necessary. Let me chew on it for a
little while. Luckilly pxdom has a test suite and I should be able to
find out quite quickly if a patch has broken something. Let me try and
chew on it, I'll report back.

Thank you all!

Manu


From clp2 at rebertia.com  Sun May 17 06:38:09 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 17 May 2009 03:38:09 -0700
Subject: Circular relationship: object - type
In-Reply-To: <89dd3da60905141534h339d361ao6171c164c3e7251b@mail.gmail.com>
References: <89dd3da60905141534h339d361ao6171c164c3e7251b@mail.gmail.com>
Message-ID: <50697b2c0905170338o4fd84406n214256662ccd18a9@mail.gmail.com>

On Thu, May 14, 2009 at 3:34 PM, Mohan Parthasarathy <suruti94 at gmail.com> wrote:
> Hi,
>
> I have read several articles and emails:
>
> http://www.cafepy.com/article/python_types_and_objects/python_types_and_objects.html#relationships-transitivity-figure
> http://mail.python.org/pipermail/python-list/2007-February/600128.html
>
>  I understand how type serves to be the default metaclass when an object is
> created and it also can be changed. I also read a few examples on why this
> metaclass can be a powerful concept. What I fail to understand is the
> circular relationship between object and type. Why does type have to be
> subclassed from object ? Just to make "Everything is an object and all
> objects are  inherited from object class".

Yes, essentially. It makes the system nice and axiomatic, so one
doesn't have to deal with special-cases when writing introspective
code.

Axiom 1. All classes ultimately subclass the class `object`.
Equivalently, `issubclass(X, object) and X.__mro__[-1] is object` are
true for any class `X`, and `isinstance(Y, object)` is true for all
objects `Y`.

Axiom 2. All (meta)classes are ultimately instances of the (meta)class `type`.
Equivalently, repeated application of type() to any object will
eventually result in `type`.

Any other formulation besides Python's current one would break these
handy axioms. The canonical object-oriented language, Smalltalk, had a
nearly identical setup with regard to its meta-objects.

Cheers,
Chris
-- 
http://blog.rebertia.com


From manu3d at gmail.com  Sun May 17 06:47:17 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Sun, 17 May 2009 03:47:17 -0700 (PDT)
Subject: Conceptual flaw in pxdom?
Message-ID: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>

Hi everybody,

I'm looking at pxdom and in particular at its foundation class
DOMObject (source code at the end of the message). In it, the author
attempts to allow the establishment of readonly and read&write
attributes through the special methods __getattr__ and __setattr__. In
so doing is possible to create subclasses such as:

class MyClass(DOMObject):

    def __init__(self):
        DOMObject.__init__(self)
        self._anAttribute = "im_a_readonly_attribute"

    ## The presence of the following method allows
    ## read-only access to the attribute without the
    ## underscore, i.e.: aVar = myClassInstance.anAttribute
    def _get_anAttribute(self): return self._anAttribute

   ## Uncommenting the following line allows the setting of
"anAttribute".
   ## Commented, the same action would raise an exception.
   ## def _set_anAttribute(self, value): self._anAttribute = value

This is all good and dandy and it works, mostly. However, if you look
at the code below for the method __getattr__, it appears to be
attempting to prevent direct access to -any- variable starting with an
underscore.

    def __getattr__(self, key):
        if key[:1]=='_':
            raise AttributeError, key

But access isn't actually prevented because __getattr__ is invoked -
only- if an attribute is not found by normal means. So, is it just me
or that little snipped of code either has another purpose or simply
doesn't do the intended job?

Manu

-----
class DOMObject:
    """Base class for objects implementing DOM interfaces

    Provide properties in a way compatible with old versions of
Python:
    subclass should provide method _get_propertyName to make a read-
only
    property, and also _set_propertyName for a writable. If the
readonly
    property is set, all other properties become immutable.
    """
    def __init__(self, readonly= False):
        self._readonly= readonly

    def _get_readonly(self):
        return self._readonly

    def _set_readonly(self, value):
        self._readonly= value

    def __getattr__(self, key):
        if key[:1]=='_':
            raise AttributeError, key
        try:
            getter= getattr(self, '_get_'+key)
        except AttributeError:
            raise AttributeError, key
        return getter()

    def __setattr__(self, key, value):
        if key[:1]=='_':
            self.__dict__[key]= value
            return

        # When an object is readonly, there are a few attributes that
can be set
        # regardless. Readonly is one (obviously), but due to a wart
in the DOM
        # spec it must also be possible to set nodeValue and
textContent to
        # anything on nodes where these properties are defined to be
null (with no
        # effect). Check specifically for these property names as a
nasty hack
        # to conform exactly to the spec.
        #
        if self._readonly and key not in ('readonly', 'nodeValue',
'textContent'):
            raise NoModificationAllowedErr(self, key)
        try:
            setter= getattr(self, '_set_'+key)
        except AttributeError:
            if hasattr(self, '_get_'+key):
                raise NoModificationAllowedErr(self, key)
            raise AttributeError, key
        setter(value)


From egrefen at gmail.com  Sun May 17 06:51:16 2009
From: egrefen at gmail.com (Edward Grefenstette)
Date: Sun, 17 May 2009 03:51:16 -0700 (PDT)
Subject: Help with Tkinter on OS X --- driving me insane!
Message-ID: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>

Any attempt to do anything with Tkinter (save import) raises the
following show-stopping error:

"Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/lib-tk/Tkinter.py", line 1645, in __init__
    self._loadtk()
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/lib-tk/Tkinter.py", line 1659, in _loadtk
    % (_tkinter.TK_VERSION, tk_version)
RuntimeError: tk.h version (8.4) doesn't match libtk.a version (8.5)"

As you can see, I'm running the vanilla install python on OS X 10.5.7.
Does anyone know how I can fix this? Google searches have yielded
results ranging from suggestions it has been fixed (not for me) to
recommendations that the user rebuild python against a newer version
of libtk (which I have no idea how to do).

I would greatly appreciate any assistance the community can provide on
the matter.

Best,
Edward


From beni.cherniavsky at gmail.com  Sun May 17 06:59:00 2009
From: beni.cherniavsky at gmail.com (Beni Cherniavsky)
Date: Sun, 17 May 2009 03:59:00 -0700 (PDT)
Subject: Best practice for operations on streams of text
References: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
	<mailman.5247.1241730449.11746.python-list@python.org>
Message-ID: <4e17803b-18e5-48d0-a048-4abf5d53196e@r3g2000vbp.googlegroups.com>

On May 8, 12:07?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> def compound_filter(token_stream):
> ? ? ?stream = lowercase_token(token_stream)
> ? ? ?stream = remove_boring(stream)
> ? ? ?stream = remove_dupes(stream)
> ? ? ?for t in stream(t):
> ? ? ? ? ?yield t

The last loop is superfluous.  You can just do::

def compound_filter(token_stream):
     stream = lowercase_token(token_stream)
     stream = remove_boring(stream)
     stream = remove_dupes(stream)
     return stream

which is simpler and slightly more efficient.  This works because from
the caller's perspective, a generator is just a function that returns
an iterator.  It doesn't matter whether it implements the iterator
itself by containing ``yield`` statements, or shamelessly passes on an
iterator implemented elsewhere.


From nytrokiss at gmail.com  Sun May 17 08:03:27 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 17 May 2009 15:03:27 +0300
Subject: Fwd: [python-win32] Fwd: Autosizing column widths in Excel using 
	win32com.client ?
In-Reply-To: <4A0FE028.5030908@timgolden.me.uk>
References: <f03c4bd7-6250-496c-a58f-c6f09ba724f2@f16g2000vbf.googlegroups.com>
	<8a6b8e350905170244q2cce80fjed1e830871eae9ad@mail.gmail.com>
	<4A0FE028.5030908@timgolden.me.uk>
Message-ID: <8a6b8e350905170503i75ceac28lc18063d3d126aea9@mail.gmail.com>

---------- Forwarded message ----------
From: Tim Golden <mail at timgolden.me.uk>
Date: Sun, May 17, 2009 at 1:00 PM
Subject: Re: [python-win32] Fwd: Autosizing column widths in Excel using
win32com.client ?
To:
Cc: Python-Win32 List <python-win32 at python.org>


James Matthews wrote:

> ---------- Forwarded message ----------
> From: <nonsense at mynonsense.net>
> Date: Fri, May 15, 2009 at 7:45 PM
> Subject: Autosizing column widths in Excel using win32com.client ?
> To: python-list at python.org
>
>
> Is there a way to autosize the widths of the excel columns as when you
> double click them manually?
>

Usual answer to this kind of question: record a macro
in Excel to do what you want, and then use COM to
automate that. On my Excel 2007, this is the VBA result
of recording:

<vba>
Sub Macro2()
'
' Macro2 Macro
'
'
  Columns("A:A").Select
  Range(Selection, Selection.End(xlToRight)).Select
  Columns("A:D").EntireColumn.AutoFit
End Sub
</vba>


You then just fire up win32com.client or comtypes,
according to taste and go from there. If you need
help with the COM side of things, post back here.

TJG
_______________________________________________
python-win32 mailing list
python-win32 at python.org
http://mail.python.org/mailman/listinfo/python-win32



-- 
http://www.goldwatches.com
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From jeremy at martinfamily.freeserve.co.uk  Sun May 17 08:05:03 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Sun, 17 May 2009 05:05:03 -0700 (PDT)
Subject: Adding a Par construct to Python?
Message-ID: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>

>From a user point of view I think that adding a 'par' construct to
Python for parallel loops would add a lot of power and simplicity,
e.g.

par i in list:
    updatePartition(i)

There would be no locking and it would be the programmer's
responsibility to ensure that the loop was truly parallel and correct.

The intention of this would be to speed up Python execution on multi-
core platforms. Within a few years we will see 100+ core processors as
standard and we need to be ready for that.

There could also be parallel versions of map, filter and reduce
provided.

BUT...none of this would be possible with the current implementation
of Python with its Global Interpreter Lock, which effectively rules
out true parallel processing.

See: http://jessenoller.com/2009/02/01/python-threads-and-the-global-interpreter-lock/

What do others think?

Jeremy Martin


From jeremy at martinfamily.freeserve.co.uk  Sun May 17 08:37:37 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Sun, 17 May 2009 05:37:37 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
Message-ID: <c26b61e0-ee42-411b-a689-1f47e98f332a@r3g2000vbp.googlegroups.com>

On 17 May, 13:05, jer... at martinfamily.freeserve.co.uk wrote:
> From a user point of view I think that adding a 'par' construct to
> Python for parallel loops would add a lot of power and simplicity,
> e.g.
>
> par i in list:
> ? ? updatePartition(i)
>
...actually, thinking about this further, I think it would be good to
add a 'sync' keyword which causes a thread rendezvous within a
parallel loop. This would allow parallel loops to run for longer in
certain circumstances without having the overhead of stopping and
restarting all the threads, e.g.

par i in list:
    for j in iterations:
       updatePartion(i)
       sync
       commitBoundaryValues(i)
       sync

This example is a typical iteration over a grid, e.g. finite elements,
calculation, where the boundary values need to be read by neighbouring
partitions before they are updated. It assumes that the new values of
the boundary values are stored in temporary variables until they can
be safely updated.

Jeremy


From piet at cs.uu.nl  Sun May 17 08:42:39 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 17 May 2009 14:42:39 +0200
Subject: Help with Tkinter on OS X --- driving me insane!
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
Message-ID: <m2ab5buchs.fsf@cs.uu.nl>

>>>>> Edward Grefenstette <egrefen at gmail.com> (EG) wrote:

>EG> Any attempt to do anything with Tkinter (save import) raises the
>EG> following show-stopping error:

>EG> "Traceback (most recent call last):
>EG>   File "<stdin>", line 1, in <module>
>EG>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
>EG> python2.6/lib-tk/Tkinter.py", line 1645, in __init__
>EG>     self._loadtk()
>EG>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
>EG> python2.6/lib-tk/Tkinter.py", line 1659, in _loadtk
>EG>     % (_tkinter.TK_VERSION, tk_version)
>EG> RuntimeError: tk.h version (8.4) doesn't match libtk.a version (8.5)"

>EG> As you can see, I'm running the vanilla install python on OS X 10.5.7.
>EG> Does anyone know how I can fix this? Google searches have yielded
>EG> results ranging from suggestions it has been fixed (not for me) to
>EG> recommendations that the user rebuild python against a newer version
>EG> of libtk (which I have no idea how to do).

>EG> I would greatly appreciate any assistance the community can provide on
>EG> the matter.

Have you installed Tk version 8.5?

If so, remove it. You might also install the latest 8.4 version.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From DustanGroups at gmail.com  Sun May 17 10:02:19 2009
From: DustanGroups at gmail.com (Dustan)
Date: Sun, 17 May 2009 07:02:19 -0700 (PDT)
Subject: Photoimage on button appears pixelated when button is disabled
References: <fb96adf5-28cd-4493-8070-993f30f1d78e@v4g2000vba.googlegroups.com>
Message-ID: <a0be872b-ebff-4541-b22f-361409f56af4@l28g2000vba.googlegroups.com>

On May 15, 2:59?pm, Dustan <DustanGro... at gmail.com> wrote:
> In tkinter, when I place a photoimage on a button and disable the
> button, the image has background dots scattered through the image.
> Searching the web, I wasn't able to find any documentation on this
> behavior, nor how to turn it off. So here I am. How do I keep this
> from happening?
>
> Also, how can I extract the base-64 encoding of a GIF, so I can put
> the image directly into the code instead of having to keep a separate
> file for the image?
>
> All responses appreciated,
> Dustan

At the very least, someone ought to be able to provide an answer to
the second question.


From steve at REMOVE-THIS-cybersource.com.au  Sun May 17 10:07:33 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 17 May 2009 14:07:33 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
Message-ID: <02200d22$0$20645$c3e8da3@news.astraweb.com>

On Sun, 17 May 2009 05:05:03 -0700, jeremy wrote:

> From a user point of view I think that adding a 'par' construct to
> Python for parallel loops would add a lot of power and simplicity, e.g.
> 
> par i in list:
>     updatePartition(i)
> 
> There would be no locking and it would be the programmer's
> responsibility to ensure that the loop was truly parallel and correct.

What does 'par' actually do there?

Given that it is the programmer's responsibility to ensure that 
updatePartition was actually parallelized, couldn't that be written as:

for i in list:
    updatePartition(i)

and save a keyword?



-- 
Steven


From mail at timgolden.me.uk  Sun May 17 10:11:01 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Sun, 17 May 2009 15:11:01 +0100
Subject: Photoimage on button appears pixelated when button is disabled
In-Reply-To: <a0be872b-ebff-4541-b22f-361409f56af4@l28g2000vba.googlegroups.com>
References: <fb96adf5-28cd-4493-8070-993f30f1d78e@v4g2000vba.googlegroups.com>
	<a0be872b-ebff-4541-b22f-361409f56af4@l28g2000vba.googlegroups.com>
Message-ID: <4A101AF5.5030901@timgolden.me.uk>

Dustan wrote:
> On May 15, 2:59 pm, Dustan <DustanGro... at gmail.com> wrote:
>> In tkinter, when I place a photoimage on a button and disable the
>> button, the image has background dots scattered through the image.
>> Searching the web, I wasn't able to find any documentation on this
>> behavior, nor how to turn it off. So here I am. How do I keep this
>> from happening?
>>
>> Also, how can I extract the base-64 encoding of a GIF, so I can put
>> the image directly into the code instead of having to keep a separate
>> file for the image?
>>
>> All responses appreciated,
>> Dustan
> 
> At the very least, someone ought to be able to provide an answer to
> the second question.

Well I know nothing about Tkinter, but to do base64 encoding,
you want to look at the base64 module.

TJG


From beni.cherniavsky at gmail.com  Sun May 17 10:26:04 2009
From: beni.cherniavsky at gmail.com (Beni Cherniavsky)
Date: Sun, 17 May 2009 07:26:04 -0700 (PDT)
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz> 
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
	<pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <8dc983db-b8c4-4897-a58b-969ca5f8e14f@g20g2000vba.googlegroups.com>

[Long mail.  You may skip to the last paragraph to get the summary.]

On May 12, 12:35?pm, Steven D'Aprano wrote:
> To really be safe, that should become:
>
> try:
> ? ? rsrc = get(resource)
> except ResourceError:
> ? ? log('no more resources available')
> ? ? raise
> else:
> ? ? try:
> ? ? ? ? do_something_with(rsrc)
> ? ? finally:
> ? ? ? ? rsrc.close()
>
> which is now starting to get a bit icky (but only a bit, and only because
> of the nesting, not because of the else).
>
Note that this example doesn't need ``else``, because the ``except``
clause re-raises the exception.  It could as well be::

try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available')
    raise
try:
    do_something_with(rsrc)
finally:
    rsrc.close()

``else`` is relevant only if your ``except`` clause(s) may quietly
suppress the exception::

try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available, skipping do_something')
else:
    try:
        do_something_with(rsrc)
    finally:
        rsrc.close()

And yes, it's icky - not because of the ``else`` but because
aquisition-release done correctly is always an icky pattern.  That's
why we now have the ``with`` statement - assuming `get()` implements a
context manager, you should be able to write::

with get(resource) as rsrc:
    do_something_with(rsrc)

But wait, what if get() fails?  We get an exception!  We wanted to
suppress it::

try:
    with get(resource) as rsrc:
        do_something_with(rsrc)
except ResourceError:
    log('no more resources available, skipping do_something')

But wait, that catches ResourceError in ``do_something_with(rsrc)`` as
well!  Which is precisely what we tried to avoid by using
``try..else``!
Sadly, ``with`` doesn't have an else clause.  If somebody really
believes it should support this pattern, feel free to write a PEP.

I think this is a bad example of ``try..else``.  First, why would you
silently suppress out-of-resource exceptions?  If you don't suppress
them, you don't need ``else``.  Second, such runtime problems are
normally handled uniformely at some high level (log / abort / show a
message box / etc.), wherever they occur - if ``do_something_with(rsrc)
`` raises `ResourceError` you'd want it handled the same way.

So here is another, more practical example of ``try..else``:

try:
    bar = foo.get_bar()
except AttributeError:
    quux = foo.get_quux()
else:
    quux = bar.get_quux()

assuming ``foo.get_bar()`` is optional but ``bar.get_quux()`` isn't.
If we had put ``bar.get_quux()`` inside the ``try``, it could mask a
bug.  In fact to be precise, we don't want to catch an AttributeError
that may happen during the call to ``get_bar()``, so we should move
the call into the ``else``::

try:
    get_bar = foo.get_bar
except AttributeError:
    quux = foo.get_quux()
else:
    quux = get_bar().get_quux()

Ick!

The astute reader will notice that cases where it's important to
localize exception catching involves frequent excetions like
`AttributeError` or `IndexError` -- and that these cases are already
handled by `getattr` and `dict.get` (courtesy of Guido's Time
Machine).

Bottom line(s):
1. ``try..except..else`` is syntactically needed only when ``except``
might suppress the exception.
2. Minimal scope of ``try..except`` doesn't always apply (for
`AttirbuteError` it probably does, for `MemoryError` it probably
doesn't).
3. It *is* somewhat ackward to use, which is why the important use
cases - exceptions that are frequently raised and caught - deserve
wrapping by functions like `getattr()` with default arguments.


From grante at visi.com  Sun May 17 10:26:35 2009
From: grante at visi.com (Grant Edwards)
Date: Sun, 17 May 2009 09:26:35 -0500
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
Message-ID: <_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>

On 2009-05-17, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:
> On Sun, 17 May 2009 05:05:03 -0700, jeremy wrote:
>
>> From a user point of view I think that adding a 'par' construct to
>> Python for parallel loops would add a lot of power and simplicity, e.g.
>> 
>> par i in list:
>>     updatePartition(i)
>> 
>> There would be no locking and it would be the programmer's
>> responsibility to ensure that the loop was truly parallel and correct.
>
> What does 'par' actually do there?

My reading of the OP is that it tells the interpreter that it
can execute any/all iterations of updatePartion(i) in parallel
(or presumably serially in any order) rather than serially in a
strict sequence.

> Given that it is the programmer's responsibility to ensure
> that updatePartition was actually parallelized, couldn't that
> be written as:
>
> for i in list:
>     updatePartition(i)
>
> and save a keyword?

No, because a "for" loop is defined to execute it's iterations
serially in a specific order.  OTOH, a "par" loop is required
to execute once for each value, but those executions could
happen in parallel or in any order.

At least that's how I understood the OP.

-- 
Grant



From matusu at gmail.com  Sun May 17 10:39:38 2009
From: matusu at gmail.com (Matus)
Date: Sun, 17 May 2009 16:39:38 +0200
Subject: pushback iterator
Message-ID: <4A1021AA.7000000@gmail.com>

Hallo pylist,

I searches web and python documentation for implementation of pushback
iterator but found none in stdlib.

problem:
========
when you parse a file, often you have to read a line from parsed file
before you can decide if you want that line it or not. if not, it would
be a nice feature to be able po push the line back into the iterator, so
nest time when you pull from iterator you get this 'unused' line.

solution:
=========
I found a nice and fast solution somewhere on the net:

---------------------------------------------------------------------
class Pushback_wrapper( object ):
	def __init__( self, it ):
		self.it = it
		self.pushed_back = [ ]
		self.nextfn = it.next
	
	def __iter__( self ):
		return self
	
	def __nonzero__( self ):
		if self.pushed_back:
			return True
		
		try:
			self.pushback( self.nextfn( ) )
		except StopIteration:
			return False
		else:
			return True

	def popfn( self ):
		lst = self.pushed_back
		res = lst.pop( )
		if not lst:
			self.nextfn = self.it.next
		return res
		
	def next( self ):
		return self.nextfn( )

	def pushback( self, item ):
		self.pushed_back.append( item )
		self.nextfn = self.popfn
---------------------------------------------------------------------

proposal:
=========
as this is (as I suppose) common problem, would it be possible to extend
the stdlib of python (ie itertools module) with a similar solution so
one do not have to reinvent the wheel every time pushback is needed?


thx, Matus


From bearophileHUGS at lycos.com  Sun May 17 10:57:36 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sun, 17 May 2009 07:57:36 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
Message-ID: <e5f521ac-abba-4ea2-a441-147388855ac3@z7g2000vbh.googlegroups.com>

Jeremy Martin, nowadays a parallelfor can be useful, and in future
I'll try to introduce similar things in D too, but syntax isn't
enough. You need a way to run things in parallel. But Python has the
GIL.
To implement a good parallel for your language may also need more
immutable data structures (think about "finger trees"), and pure
functions can improve the safety of your code a lot, and so on.

The multiprocessing module Python2.6 already does something like what
you are talking about. For example I have used the parallel map of
that module to almost double the speed of a small program of mine.

Bye,
bearophile


From benjamin.kaplan at case.edu  Sun May 17 11:20:54 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sun, 17 May 2009 11:20:54 -0400
Subject: Help with Tkinter on OS X --- driving me insane!
In-Reply-To: <m2ab5buchs.fsf@cs.uu.nl>
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
Message-ID: <ec96e1390905170820l352286bia0e788d626b9b827@mail.gmail.com>

On Sun, May 17, 2009 at 8:42 AM, Piet van Oostrum <piet at cs.uu.nl> wrote:

> >>>>> Edward Grefenstette <egrefen at gmail.com> (EG) wrote:
>
> >EG> Any attempt to do anything with Tkinter (save import) raises the
> >EG> following show-stopping error:
>
> >EG> "Traceback (most recent call last):
> >EG>   File "<stdin>", line 1, in <module>
> >EG>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> >EG> python2.6/lib-tk/Tkinter.py", line 1645, in __init__
> >EG>     self._loadtk()
> >EG>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> >EG> python2.6/lib-tk/Tkinter.py", line 1659, in _loadtk
> >EG>     % (_tkinter.TK_VERSION, tk_version)
> >EG> RuntimeError: tk.h version (8.4) doesn't match libtk.a version (8.5)"
>
> >EG> As you can see, I'm running the vanilla install python on OS X 10.5.7.
> >EG> Does anyone know how I can fix this? Google searches have yielded
> >EG> results ranging from suggestions it has been fixed (not for me) to
> >EG> recommendations that the user rebuild python against a newer version
> >EG> of libtk (which I have no idea how to do).
>
> >EG> I would greatly appreciate any assistance the community can provide on
> >EG> the matter.
>
> Have you installed Tk version 8.5?
>
> If so, remove it. You might also install the latest 8.4 version.


There were a couple bugs in the 2.6.0 installer that stopped Tkinter from
working and this error message was given by one of them[1]. The python
installer looked in /System/Library before /Library/, so it used the System
Tk. The linker looks in /Library first so it found the user installed Tk and
used that instead. You then get a version mismatch. Try reinstalling Python
(use 2.6.2 if you're not already). That should get it to link with the
proper Tk.

[1] http://bugs.python.org/issue4017

--
> Piet van Oostrum <piet at cs.uu.nl>
> URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
> Private email: piet at vanoostrum.org
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From mk.fraggod at gmail.com  Sun May 17 11:22:22 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sun, 17 May 2009 21:22:22 +0600
Subject: pushback iterator
In-Reply-To: <4A1021AA.7000000@gmail.com>
References: <4A1021AA.7000000@gmail.com>
Message-ID: <20090517212222.059ee13c@coercion>

On Sun, 17 May 2009 16:39:38 +0200
Matus <matusu at gmail.com> wrote:

> I searches web and python documentation for implementation of pushback
> iterator but found none in stdlib.
> 
> problem:
> ========
> when you parse a file, often you have to read a line from parsed file
> before you can decide if you want that line it or not. if not, it would
> be a nice feature to be able po push the line back into the iterator, so
> nest time when you pull from iterator you get this 'unused' line.
>  
...
> 
> proposal:
> =========
> as this is (as I suppose) common problem, would it be possible to extend
> the stdlib of python (ie itertools module) with a similar solution so
> one do not have to reinvent the wheel every time pushback is needed?  

Sounds to me more like an iterator with a cache - you can't really pull
the line from a real iterable like generator function and then just push
it back.
If this "iterator" is really a list then you can use it as such w/o
unnecessary in-out operations.

And if you're "pushing back" the data for later use you might just as
well push it to dict with the right indexing, so the next "pop" won't
have to roam thru all the values again but instantly get the right one
from the cache, or just get on with that iterable until it depletes.

What real-world scenario am I missing here?

-- 
Mike Kazantsev // fraggod.net
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From steve at REMOVE-THIS-cybersource.com.au  Sun May 17 11:53:56 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 17 May 2009 15:53:56 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
Message-ID: <0220260f$0$20645$c3e8da3@news.astraweb.com>

On Sun, 17 May 2009 09:26:35 -0500, Grant Edwards wrote:

> On 2009-05-17, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au>
> wrote:
>> On Sun, 17 May 2009 05:05:03 -0700, jeremy wrote:
>>
>>> From a user point of view I think that adding a 'par' construct to
>>> Python for parallel loops would add a lot of power and simplicity,
>>> e.g.
>>> 
>>> par i in list:
>>>     updatePartition(i)
>>> 
>>> There would be no locking and it would be the programmer's
>>> responsibility to ensure that the loop was truly parallel and correct.
>>
>> What does 'par' actually do there?
> 
> My reading of the OP is that it tells the interpreter that it can
> execute any/all iterations of updatePartion(i) in parallel (or
> presumably serially in any order) rather than serially in a strict
> sequence.
> 
>> Given that it is the programmer's responsibility to ensure that
>> updatePartition was actually parallelized, couldn't that be written as:
>>
>> for i in list:
>>     updatePartition(i)
>>
>> and save a keyword?
> 
> No, because a "for" loop is defined to execute it's iterations serially
> in a specific order.  OTOH, a "par" loop is required to execute once for
> each value, but those executions could happen in parallel or in any
> order.
> 
> At least that's how I understood the OP.

I can try guessing what the OP is thinking just as well as anyone else, 
but "in the face of ambiguity, refuse the temptation to guess" :)

It isn't clear to me what the OP expects the "par" construct is supposed 
to actually do. Does it create a thread for each iteration? A process? 
Something else? Given that the rest of Python will be sequential (apart 
from explicitly parallelized functions), and that the OP specifies that 
updatePartition still needs to handle its own parallelization, does it 
really matter if the calls to updatePartition happen sequentially?

If it's important to make the calls in arbitrary order, random.shuffle 
will do that. If there's some other non-sequential and non-random order 
to the calls, the OP should explain what it is. What else, if anything, 
does par do, that it needs to be a keyword and statement rather than a 
function? What does it do that (say) a parallel version of map() wouldn't 
do?

The OP also suggested:

"There could also be parallel versions of map, filter and reduce
provided."

It makes sense to talk about parallelizing map(), because you can 
allocate a list of the right size to slot the results into as they become 
available. I'm not so sure about filter(), unless you give up the 
requirement that the filtered results occur in the same order as the 
originals.

But reduce()? I can't see how you can parallelize reduce(). By its 
nature, it has to run sequentially: it can't operate on the nth item 
until it is operated on the (n-1)th item.



-- 
Steven


From mk.fraggod at gmail.com  Sun May 17 12:15:52 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sun, 17 May 2009 22:15:52 +0600
Subject: pushback iterator
In-Reply-To: <4A103073.3090208@gmail.com>
References: <4A1021AA.7000000@gmail.com> <20090517212222.059ee13c@coercion>
	<4A103073.3090208@gmail.com>
Message-ID: <20090517221552.19946e30@coercion>

Somehow, I got the message off the list.

On Sun, 17 May 2009 17:42:43 +0200
Matus <matusu at gmail.com> wrote:

> > Sounds to me more like an iterator with a cache - you can't really pull
> > the line from a real iterable like generator function and then just push
> > it back.
> 
> true, that is why you have to implement this iterator wrapper

I fail to see much point of such a dumb cache, in most cases you
shouldn't iterate again and again thru the same sequence, so what's
good hardcoding (and thus, encouraging) such thing will do?

Besides, this wrapper breaks iteration order, since it's cache is LIFO
instead of FIFO, which should rather be implemented with deque instead
of list.

> > If this "iterator" is really a list then you can use it as such w/o
> > unnecessary in-out operations.
> 
> of course, it is not a list. you can wrap 'real' iterator using this
> wrapper (), and voila, you can use pushback method to 'push back' item
> received by next method. by calling next again, you will get pushed back
> item again, that is actually the point.

Wrapper differs from "list(iterator)" in only one thing: it might not
make it to the end of iterable, but if "pushing back" is common
operation, there's a good chance you'll make it to the end of the
iterator during execution, dragging whole thing along as a burden each
time.

> > And if you're "pushing back" the data for later use you might just as
> > well push it to dict with the right indexing, so the next "pop" won't
> > have to roam thru all the values again but instantly get the right one
> > from the cache, or just get on with that iterable until it depletes.
> > 
> > What real-world scenario am I missing here?
> > 
> 
> ok, I admit that that the file was not good example. better example
> would be just any iterator you use in your code.

Somehow I've always managed to avoid such re-iteration scenarios, but
of course, it could be just my luck ;)

-- 
Mike Kazantsev // fraggod.net
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From google at mrabarnett.plus.com  Sun May 17 12:19:15 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 17 May 2009 17:19:15 +0100
Subject: Adding a Par construct to Python?
In-Reply-To: <0220260f$0$20645$c3e8da3@news.astraweb.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<02200d22$0$20645$c3e8da3@news.astraweb.com>	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
Message-ID: <4A103903.5080302@mrabarnett.plus.com>

Steven D'Aprano wrote:
> On Sun, 17 May 2009 09:26:35 -0500, Grant Edwards wrote:
> 
>> On 2009-05-17, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au>
>> wrote:
>>> On Sun, 17 May 2009 05:05:03 -0700, jeremy wrote:
>>>
>>>> From a user point of view I think that adding a 'par' construct to
>>>> Python for parallel loops would add a lot of power and simplicity,
>>>> e.g.
>>>>
>>>> par i in list:
>>>>     updatePartition(i)
>>>>
>>>> There would be no locking and it would be the programmer's
>>>> responsibility to ensure that the loop was truly parallel and correct.
>>> What does 'par' actually do there?
>> My reading of the OP is that it tells the interpreter that it can
>> execute any/all iterations of updatePartion(i) in parallel (or
>> presumably serially in any order) rather than serially in a strict
>> sequence.
>>
>>> Given that it is the programmer's responsibility to ensure that
>>> updatePartition was actually parallelized, couldn't that be written as:
>>>
>>> for i in list:
>>>     updatePartition(i)
>>>
>>> and save a keyword?
>> No, because a "for" loop is defined to execute it's iterations serially
>> in a specific order.  OTOH, a "par" loop is required to execute once for
>> each value, but those executions could happen in parallel or in any
>> order.
>>
>> At least that's how I understood the OP.
> 
> I can try guessing what the OP is thinking just as well as anyone else, 
> but "in the face of ambiguity, refuse the temptation to guess" :)
> 
> It isn't clear to me what the OP expects the "par" construct is supposed 
> to actually do. Does it create a thread for each iteration? A process? 
> Something else? Given that the rest of Python will be sequential (apart 
> from explicitly parallelized functions), and that the OP specifies that 
> updatePartition still needs to handle its own parallelization, does it 
> really matter if the calls to updatePartition happen sequentially?
> 
> If it's important to make the calls in arbitrary order, random.shuffle 
> will do that. If there's some other non-sequential and non-random order 
> to the calls, the OP should explain what it is. What else, if anything, 
> does par do, that it needs to be a keyword and statement rather than a 
> function? What does it do that (say) a parallel version of map() wouldn't 
> do?
> 
> The OP also suggested:
> 
> "There could also be parallel versions of map, filter and reduce
> provided."
> 
> It makes sense to talk about parallelizing map(), because you can 
> allocate a list of the right size to slot the results into as they become 
> available. I'm not so sure about filter(), unless you give up the 
> requirement that the filtered results occur in the same order as the 
> originals.
> 
> But reduce()? I can't see how you can parallelize reduce(). By its 
> nature, it has to run sequentially: it can't operate on the nth item 
> until it is operated on the (n-1)th item.
> 
It can calculate the items in parallel, but the final result must be
calculated sequence, although if the final operation is commutative then
some of them could be done in parallel.


From deets at nospam.web.de  Sun May 17 12:24:34 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 17 May 2009 18:24:34 +0200
Subject: Adding a Par construct to Python?
In-Reply-To: <0220260f$0$20645$c3e8da3@news.astraweb.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<02200d22$0$20645$c3e8da3@news.astraweb.com>	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
Message-ID: <77as23F1fhj3uU1@mid.uni-berlin.de>

> But reduce()? I can't see how you can parallelize reduce(). By its 
> nature, it has to run sequentially: it can't operate on the nth item 
> until it is operated on the (n-1)th item.

That depends on the operation in question. Addition for example would 
work. My math-skills are a bit too rusty to qualify the exact nature of 
the operation, commutativity springs to my mind.

Diez


From kyrie at uh.cu  Sun May 17 12:47:35 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Sun, 17 May 2009 12:47:35 -0400
Subject: pushback iterator
In-Reply-To: <20090517212222.059ee13c@coercion>
References: <4A1021AA.7000000@gmail.com> <20090517212222.059ee13c@coercion>
Message-ID: <1242578855.4a103fa7979ed@mail.uh.cu>


Quoting Mike Kazantsev <mk.fraggod at gmail.com>:

> And if you're "pushing back" the data for later use you might just as
> well push it to dict with the right indexing, so the next "pop" won't
> have to roam thru all the values again but instantly get the right one
> from the cache, or just get on with that iterable until it depletes.
> 
> What real-world scenario am I missing here?

Other than one he described in his message? Neither of your proposed solutions
solves the OP's problem. He doesn't have a list (he /could/ build a list, and
thus defeat the purpose of having an iterator). He /could/ use alternative data
structures, like the dictionary you are suggesting... and he is, he is using his
pushback iterator, but he has to include it over and over.

Currently there is no good "pythonic" way of building a functions that decide to
stop consuming from an iterator when the first invalid input is encountered:
that last, invalid input is lost from the iterator. You can't just abstract the
whole logic inside the function, "something" must leak.

Consider, for instance, the itertools.dropwhile (and takewhile). You can't just
use it like

i = iter(something)
itertools.dropwhile(condition, i)
# now consume the rest

Instead, you have to do this:

i = iter(something)
i = itertools.dropwhile(condition, i) 
# and now i contains _another_ iterator
# and the first one still exists[*], but shouldn't be used
# [*] (assume it was a parameter instead of the iter construct)

For parsing files, for instance (similar to the OP's example), it could be nice
to do:

f = file(something)
lines = iter(f)
parse_headers(lines)
parse_body(lines)
parse_footer(lines)

which is currently impossible.

To the OP: if you don't mind doing instead:

f = file(something)
rest = parse_headers(f)
rest = parse_body(rest)
rest = parse_footer(rest)

you could return itertools.chain([pushed_back], iterator) from your parsing
functions. Unfortunately, this way will add another layer of itertools.chain on
top of the iterator, you will have to hope this will not cause a
performace/memory penalty.

Cheers,

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie

-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From roy at panix.com  Sun May 17 12:53:02 2009
From: roy at panix.com (Roy Smith)
Date: Sun, 17 May 2009 12:53:02 -0400
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
Message-ID: <roy-30A326.12530217052009@news.panix.com>

In article <0220260f$0$20645$c3e8da3 at news.astraweb.com>,
 Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:

> But reduce()? I can't see how you can parallelize reduce(). By its 
> nature, it has to run sequentially: it can't operate on the nth item 
> until it is operated on the (n-1)th item.

Well, if you're willing to impose the additional constraint that f() must 
be associative, then you could load the items into a tree, and work your 
way up from the bottom of the tree, applying f() pairwise to the left and 
right child of each node, propagating upward.

It would take k1 * O(n) to create the (unsorted) tree, and if all the pairs 
in each layer really could be done in parallel, k2 * O(lg n) to propagate 
the intermediate values.  As long as k2 is large compared to k1, you win.

Of course, if the items are already in some random-access container (such 
as a list), you don't even need to do the first step, but in the general 
case of generating the elements on the fly with an iterable, you do.  Even 
with an iterable, you could start processing the first elements while 
you're still generating the rest of them, but that gets a lot more 
complicated and assuming k2 >> k1, of limited value.

If k2 is about the same as k1, then the whole thing is pointless.

But, this would be something to put in a library function, or maybe a 
special-purpose Python derivative, such as numpy.  Not in the core language.


From gherron at islandtraining.com  Sun May 17 13:56:18 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Sun, 17 May 2009 10:56:18 -0700
Subject: Adding a Par construct to Python?
In-Reply-To: <4A103903.5080302@mrabarnett.plus.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<02200d22$0$20645$c3e8da3@news.astraweb.com>	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<4A103903.5080302@mrabarnett.plus.com>
Message-ID: <4A104FC2.7020801@islandtraining.com>

MRAB wrote:
> Steven D'Aprano wrote:
>> On Sun, 17 May 2009 09:26:35 -0500, Grant Edwards wrote:
>>
>>> On 2009-05-17, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au>
>>> wrote:
>>>> On Sun, 17 May 2009 05:05:03 -0700, jeremy wrote:
>>>>
>>>>> From a user point of view I think that adding a 'par' construct to
>>>>> Python for parallel loops would add a lot of power and simplicity,
>>>>> e.g.
>>>>>
>>>>> par i in list:
>>>>>     updatePartition(i)
>>>>>
>>>>> There would be no locking and it would be the programmer's
>>>>> responsibility to ensure that the loop was truly parallel and 
>>>>> correct.
>>>> What does 'par' actually do there?
>>> My reading of the OP is that it tells the interpreter that it can
>>> execute any/all iterations of updatePartion(i) in parallel (or
>>> presumably serially in any order) rather than serially in a strict
>>> sequence.
>>>
>>>> Given that it is the programmer's responsibility to ensure that
>>>> updatePartition was actually parallelized, couldn't that be written 
>>>> as:
>>>>
>>>> for i in list:
>>>>     updatePartition(i)
>>>>
>>>> and save a keyword?
>>> No, because a "for" loop is defined to execute it's iterations serially
>>> in a specific order.  OTOH, a "par" loop is required to execute once 
>>> for
>>> each value, but those executions could happen in parallel or in any
>>> order.
>>>
>>> At least that's how I understood the OP.
>>
>> I can try guessing what the OP is thinking just as well as anyone 
>> else, but "in the face of ambiguity, refuse the temptation to guess" :)
>>
>> It isn't clear to me what the OP expects the "par" construct is 
>> supposed to actually do. Does it create a thread for each iteration? 
>> A process? Something else? Given that the rest of Python will be 
>> sequential (apart from explicitly parallelized functions), and that 
>> the OP specifies that updatePartition still needs to handle its own 
>> parallelization, does it really matter if the calls to 
>> updatePartition happen sequentially?
>>
>> If it's important to make the calls in arbitrary order, 
>> random.shuffle will do that. If there's some other non-sequential and 
>> non-random order to the calls, the OP should explain what it is. What 
>> else, if anything, does par do, that it needs to be a keyword and 
>> statement rather than a function? What does it do that (say) a 
>> parallel version of map() wouldn't do?
>>
>> The OP also suggested:
>>
>> "There could also be parallel versions of map, filter and reduce
>> provided."
>>
>> It makes sense to talk about parallelizing map(), because you can 
>> allocate a list of the right size to slot the results into as they 
>> become available. I'm not so sure about filter(), unless you give up 
>> the requirement that the filtered results occur in the same order as 
>> the originals.
>>
>> But reduce()? I can't see how you can parallelize reduce(). By its 
>> nature, it has to run sequentially: it can't operate on the nth item 
>> until it is operated on the (n-1)th item.
>>
> It can calculate the items in parallel, but the final result must be
> calculated sequence, although if the final operation is commutative then
> some of them could be done in parallel.

That should read "associative" not "commutative".

For instance A+B+C+D could be calculated sequentially as implied by
  ((A+B)+C)+D
or with some parallelism as implied by
  (A+B)+(C+D)
That's an application of the associativity of addition.

Gary Herron




From steve at REMOVE-THIS-cybersource.com.au  Sun May 17 14:11:57 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 17 May 2009 18:11:57 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de>
Message-ID: <02204669$0$25303$c3e8da3@news.astraweb.com>

On Sun, 17 May 2009 18:24:34 +0200, Diez B. Roggisch wrote:

>> But reduce()? I can't see how you can parallelize reduce(). By its
>> nature, it has to run sequentially: it can't operate on the nth item
>> until it is operated on the (n-1)th item.
> 
> That depends on the operation in question. Addition for example would
> work. 

You'd think so, but you'd be wrong. You can't assume addition is always 
commutative.

>>> reduce(operator.add, (1.0, 1e57, -1e57))
0.0
>>> reduce(operator.add, (1e57, -1e57, 1.0))
1.0



> My math-skills are a bit too rusty to qualify the exact nature of
> the operation, commutativity springs to my mind.

And how is reduce() supposed to know whether or not some arbitrary 
function is commutative?


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun May 17 14:16:07 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 17 May 2009 18:16:07 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<mailman.290.1242577147.8015.python-list@python.org>
Message-ID: <02204763$0$25303$c3e8da3@news.astraweb.com>

On Sun, 17 May 2009 17:19:15 +0100, MRAB wrote:

>> But reduce()? I can't see how you can parallelize reduce(). By its
>> nature, it has to run sequentially: it can't operate on the nth item
>> until it is operated on the (n-1)th item.
>> 
> It can calculate the items in parallel, 

I don't understand what calculation you are talking about. Let's take a 
simple example:

reduce(operator.sub, [100, 50, 25, 5])  => 100-50-25-5 = 20

What calculations do you expect to do in parallel?


> but the final result must be
> calculated sequence, although if the final operation is commutative then
> some of them could be done in parallel.

But reduce() can't tell whether the function being applied is commutative 
or not. I suppose it could special-case a handful of special cases (e.g. 
operator.add for int arguments -- but not floats!) or take a caller-
supplied argument that tells it whether the function is commutative or 
not. But in general, you can't assume the function being applied is 
commutative or associative, so unless you're willing to accept undefined 
behaviour, I don't see any practical way of parallelizing reduce().


-- 
Steven


From deets at nospam.web.de  Sun May 17 14:34:00 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 17 May 2009 20:34:00 +0200
Subject: Adding a Par construct to Python?
In-Reply-To: <02204669$0$25303$c3e8da3@news.astraweb.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<02200d22$0$20645$c3e8da3@news.astraweb.com>	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>	<0220260f$0$20645$c3e8da3@news.astraweb.com>	<77as23F1fhj3uU1@mid.uni-berlin.de>
	<02204669$0$25303$c3e8da3@news.astraweb.com>
Message-ID: <77b3koF1go3t7U1@mid.uni-berlin.de>

> 
>> My math-skills are a bit too rusty to qualify the exact nature of
>> the operation, commutativity springs to my mind.
> 
> And how is reduce() supposed to know whether or not some arbitrary 
> function is commutative?

I don't recall anybody saying it should know that - do you? The OP wants 
to introduce parallel variants, not replace the existing ones.

Diez


From google at mrabarnett.plus.com  Sun May 17 14:35:01 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 17 May 2009 19:35:01 +0100
Subject: Adding a Par construct to Python?
In-Reply-To: <02204763$0$25303$c3e8da3@news.astraweb.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<02200d22$0$20645$c3e8da3@news.astraweb.com>	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>	<0220260f$0$20645$c3e8da3@news.astraweb.com>	<mailman.290.1242577147.8015.python-list@python.org>
	<02204763$0$25303$c3e8da3@news.astraweb.com>
Message-ID: <4A1058D5.7090109@mrabarnett.plus.com>

Steven D'Aprano wrote:
> On Sun, 17 May 2009 17:19:15 +0100, MRAB wrote:
> 
>>> But reduce()? I can't see how you can parallelize reduce(). By its
>>> nature, it has to run sequentially: it can't operate on the nth item
>>> until it is operated on the (n-1)th item.
>>>
>> It can calculate the items in parallel, 
> 
> I don't understand what calculation you are talking about. Let's take a 
> simple example:
> 
> reduce(operator.sub, [100, 50, 25, 5])  => 100-50-25-5 = 20
> 
> What calculations do you expect to do in parallel?
> 
> 
>> but the final result must be
>> calculated sequence, although if the final operation is commutative then
>> some of them could be done in parallel.
> 
> But reduce() can't tell whether the function being applied is commutative 
> or not. I suppose it could special-case a handful of special cases (e.g. 
> operator.add for int arguments -- but not floats!) or take a caller-
> supplied argument that tells it whether the function is commutative or 
> not. But in general, you can't assume the function being applied is 
> commutative or associative, so unless you're willing to accept undefined 
> behaviour, I don't see any practical way of parallelizing reduce().
> 
I meant associative not commutative.

I was thinking about calculating the sum of a list of expressions, where
the expressions could be calculated in parallel.


From deets at nospam.web.de  Sun May 17 14:36:36 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 17 May 2009 20:36:36 +0200
Subject: Adding a Par construct to Python?
In-Reply-To: <02204763$0$25303$c3e8da3@news.astraweb.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<02200d22$0$20645$c3e8da3@news.astraweb.com>	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>	<0220260f$0$20645$c3e8da3@news.astraweb.com>	<mailman.290.1242577147.8015.python-list@python.org>
	<02204763$0$25303$c3e8da3@news.astraweb.com>
Message-ID: <77b3pkF1go3t7U2@mid.uni-berlin.de>

> But reduce() can't tell whether the function being applied is commutative 
> or not. I suppose it could special-case a handful of special cases (e.g. 
> operator.add for int arguments -- but not floats!) or take a caller-
> supplied argument that tells it whether the function is commutative or 
> not. But in general, you can't assume the function being applied is 
> commutative or associative, so unless you're willing to accept undefined 
> behaviour, I don't see any practical way of parallelizing reduce().

def reduce(operation, sequence, startitem=None, parallelize=False)

should be enough. Approaches such as OpenMP also don't guess, they use 
explicit annotations.

Diez


From anuhacks at gmail.com  Sun May 17 15:13:31 2009
From: anuhacks at gmail.com (anusha k)
Date: Mon, 18 May 2009 00:43:31 +0530
Subject: threading issue
Message-ID: <61f9a5fb0905171213x84e8223haf84b5f58d835c61@mail.gmail.com>

hi,

i am using pygtk,glade in the front end and postgresql,python-twisted
(xmlrpc) as the back end.My issue is i am trying to add the progress bar in
my application but when the progress bar comes up it is blocking the backend
process.So i started using threading in my application.But when i added that
it is working but i am not able to destroy the window where the progress bar
is present, which is part of main window.
********************************************************************************************************
my code is
class ledger(threading.Thread):
    """This class sets the fraction of the progressbar"""

    #Thread event, stops the thread if it is set.
    stopthread = threading.Event()
 ......
    wTree = gtk.glade.XML('gnukhata/main_window.glade','window_progressbar')
    window = wTree.get_widget('window_progressbar')
    window.set_size_request(300,50)
    progressbar = wTree.get_widget('progressbar')
    #window.connect('destroy',self.main_quit)
    window.show_all()



    def run(self):
        """Run method, this is the code that runs while thread is alive."""

        #Importing the progressbar widget from the global scope
        #global progressbar
        course = True
        #While the stopthread event isn't setted, the thread keeps going on
        while course :
            # Acquiring the gtk global mutex
            gtk.gdk.threads_enter()
            #Setting a random value for the fraction
            l=0.1
            while l<1:
                self.progressbar.pulse()
                time.sleep(0.1)
                l=l+0.1


            queryParams = []
            res1=self.x.account.getAllAccountNamesByLedger(queryParams)
            for l in range(0,len(res1)):
               ;;;;;;;;;;;;;;;;;;
            # Releasing the gtk global mutex
            gtk.gdk.threads_leave()

            #Delaying 100ms until the next iteration
            time.sleep(0.1)
            course = False
        #gtk.main_quit()
        global fs
        print 'anu'
        #Stopping the thread and the gtk's main loop
        fs.stop()

        #window.destroy()

        self.ods.save("Ledger.ods")
        os.system("ooffice Ledger.ods")


    def stop(self):
        """Stop method, sets the event to terminate the thread's main
loop"""
        self.stopthread.set()

*********************************************************************************************************



njoy the share of freedom,
Anusha Kadambala
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From steve.ferg.bitbucket at gmail.com  Sun May 17 15:44:31 2009
From: steve.ferg.bitbucket at gmail.com (Steve Ferg)
Date: Sun, 17 May 2009 12:44:31 -0700 (PDT)
Subject: Seeking old post on developers who like IDEs vs developers who like 
	simple languages
Message-ID: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>

A few years ago someone, somewhere on the Web, posted a blog in which
he observed that developers, by general temperament, seem to fall into
two groups.

On the one hand, there are developers who love big IDEs with lots of
features (code generation, error checking, etc.), and rely on them to
provide the high level of support needed to be reasonably productive
in heavy-weight languages (e.g. Java).

On the other hand there are developers who much prefer to keep things
light-weight and simple.  They like clean high-level languages (e.g.
Python) which are compact enough that you can keep the whole language
in your head, and require only a good text editor to be used
effectively.

The author wasn't saying that one was better than the other: only that
there seemed to be this recognizable difference in preferences.

I periodically think of that blog, usually in circumstances that make
me also think "Boy, that guy really got it right".  But despite
repeated and prolonged bouts of googling I haven't been able to find
the article again.  I must be using the wrong search terms or
something.

Does anybody have a link to this article?

Thanks VERY MUCH in advance,
-- Steve Ferg


From matusu at gmail.com  Sun May 17 16:17:17 2009
From: matusu at gmail.com (Matus)
Date: Sun, 17 May 2009 22:17:17 +0200
Subject: pushback iterator
In-Reply-To: <1242578855.4a103fa7979ed@mail.uh.cu>
References: <4A1021AA.7000000@gmail.com> <20090517212222.059ee13c@coercion>
	<1242578855.4a103fa7979ed@mail.uh.cu>
Message-ID: <4A1070CD.5030403@gmail.com>



Luis Alberto Zarrabeitia Gomez wrote:
> Quoting Mike Kazantsev <mk.fraggod at gmail.com>:
> 
>> And if you're "pushing back" the data for later use you might just as
>> well push it to dict with the right indexing, so the next "pop" won't
>> have to roam thru all the values again but instantly get the right one
>> from the cache, or just get on with that iterable until it depletes.
>>
>> What real-world scenario am I missing here?
> 
> Other than one he described in his message? Neither of your proposed solutions
> solves the OP's problem. He doesn't have a list (he /could/ build a list, and
> thus defeat the purpose of having an iterator). He /could/ use alternative data
> structures, like the dictionary you are suggesting... and he is, he is using his
> pushback iterator, but he has to include it over and over.
> 
> Currently there is no good "pythonic" way of building a functions that decide to
> stop consuming from an iterator when the first invalid input is encountered:
> that last, invalid input is lost from the iterator. You can't just abstract the
> whole logic inside the function, "something" must leak.
> 
> Consider, for instance, the itertools.dropwhile (and takewhile). You can't just
> use it like
> 
> i = iter(something)
> itertools.dropwhile(condition, i)
> # now consume the rest
> 
> Instead, you have to do this:
> 
> i = iter(something)
> i = itertools.dropwhile(condition, i) 
> # and now i contains _another_ iterator
> # and the first one still exists[*], but shouldn't be used
> # [*] (assume it was a parameter instead of the iter construct)
> 
> For parsing files, for instance (similar to the OP's example), it could be nice
> to do:
> 
> f = file(something)
> lines = iter(f)
> parse_headers(lines)
> parse_body(lines)
> parse_footer(lines)
> 

that is basically one of many possible scenarios I was referring to.
other example would be:

----------------------------------------------------
iter = Pushback_wrapper( open( 'my.file' ).readlines( ) )
for line in iter:
	if is_outer_scope( line ):
		'''
		do some processing for this logical scope of file. there is only fet
outer scope lines
		'''
		continue
	
	for line in iter:
		'''
		here we expect 1000 - 2000 lines of inner scope and we do not want to
run is_outer_scope()
		for every line as it is expensive, so we decided to reiterate
		'''
		if is_inner_scope( line ):
			'''
			do some processing for this logical scope of file untill outer scope
condition occurs
			'''
		elif is_outer_scope( line ):
			iter.pushback( line )
			break
		else:
			'''flush line'''
----------------------------------------------------

> which is currently impossible.
> 
> To the OP: if you don't mind doing instead:
> 
> f = file(something)
> rest = parse_headers(f)
> rest = parse_body(rest)
> rest = parse_footer(rest)
> 
> you could return itertools.chain([pushed_back], iterator) from your parsing
> functions. Unfortunately, this way will add another layer of itertools.chain on
> top of the iterator, you will have to hope this will not cause a
> performace/memory penalty.
> 
> Cheers,
> 


From tjreedy at udel.edu  Sun May 17 16:18:52 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 17 May 2009 16:18:52 -0400
Subject: Swapping superclass from a module
In-Reply-To: <guoe2u$ra8$02$1@news.t-online.com>
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>	<021f5d69$0$20645$c3e8da3@news.astraweb.com>	<mailman.272.1242540495.8015.python-list@python.org>
	<guoe2u$ra8$02$1@news.t-online.com>
Message-ID: <guprfa$1q8$1@ger.gmane.org>

Peter Otten wrote:
> Terry Reedy wrote:
> 

>> If the names of superclasses is resolved when classes are instantiated,
>> the patching is easy.  If, as I would suspect, the names are resolved
>> when the classes are created, before the module becomes available to the
>> importing code, then much more careful and extensive patching would be
>> required, if it is even possible.  (Objects in tuples cannot be
>> replaced, and some attributes are not writable.)
> 
> It may be sufficient to patch the subclasses:

I was not sure if __bases__ is writable or not.  There is also __mro__ 
to consider.

> $ cat my_file.py
> class Super(object):
>     def __str__(self):
>         return "old"
> 
> class Sub(Super):
>     def __str__(self):
>         return "Sub(%s)" % super(Sub, self).__str__()
> 
> class Other(object):
>     pass
> 
> class SubSub(Sub, Other):
>     def __str__(self):
>         return "SubSub(%s)" % super(SubSub, self).__str__()
> 
> if __name__ == "__main__":
>     print Sub()
> 
> $ cat main2.py
> import my_file
> OldSuper = my_file.Super
> 
> class NewSuper(OldSuper):
>     def __str__(self):
>         return "new" + super(NewSuper, self).__str__()
> 
> my_file.Super = NewSuper
> for n, v in vars(my_file).iteritems():
>     if v is not NewSuper:
>         try:
>             bases = v.__bases__
>         except AttributeError:
>             pass
>         else:
>             if OldSuper in bases:
>                 print "patching", n
>                 v.__bases__ = tuple(NewSuper if b is OldSuper else b
>                                     for b in bases)
> 
> 
> print my_file.Sub()
> print my_file.SubSub()
> $ python main2.py
> patching Sub
> Sub(newold)
> SubSub(Sub(newold))
> 
> Peter
> 



From martin at v.loewis.de  Sun May 17 16:54:32 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 17 May 2009 22:54:32 +0200
Subject: PEP 384: Defining a Stable ABI
Message-ID: <4A107988.3020202@v.loewis.de>

Thomas Wouters reminded me of a long-standing idea; I finally
found the time to write it down.

Please comment!

Regards,
Martin

PEP: 384
Title: Defining a Stable ABI
Version: $Revision: 72754 $
Last-Modified: $Date: 2009-05-17 21:14:52 +0200 (So, 17. Mai 2009) $
Author: Martin v. L?wis <martin at v.loewis.de>
Status: Draft
Type: Standards Track
Content-Type: text/x-rst
Created: 17-May-2009
Python-Version: 3.2
Post-History:

Abstract
========

Currently, each feature release introduces a new name for the
Python DLL on Windows, and may cause incompatibilities for extension
modules on Unix. This PEP proposes to define a stable set of API
functions which are guaranteed to be available for the lifetime
of Python 3, and which will also remain binary-compatible across
versions. Extension modules and applications embedding Python
can work with different feature releases as long as they restrict
themselves to this stable ABI.

Rationale
=========

The primary source of ABI incompatibility are changes to the lay-out
of in-memory structures. For example, the way in which string interning
works, or the data type used to represent the size of an object, have
changed during the life of Python 2.x. As a consequence, extension
modules making direct access to fields of strings, lists, or tuples,
would break if their code is loaded into a newer version of the
interpreter without recompilation: offsets of other fields may have
changed, making the extension modules access the wrong data.

In some cases, the incompatibilities only affect internal objects of
the interpreter, such as frame or code objects. For example, the way
line numbers are represented has changed in the 2.x lifetime, as has
the way in which local variables are stored (due to the introduction
of closures). Even though most applications probably never used these
objects, changing them had required to change the PYTHON_API_VERSION.

On Linux, changes to the ABI are often not much of a problem: the
system will provide a default Python installation, and many extension
modules are already provided pre-compiled for that version. If additional
modules are needed, or additional Python versions, users can typically
compile them themselves on the system, resulting in modules that use
the right ABI.

On Windows, multiple simultaneous installations of different Python
versions are common, and extension modules are compiled by their
authors, not by end users. To reduce the risk of ABI incompatibilities,
Python currently introduces a new DLL name pythonXY.dll for each
feature release, whether or not ABI incompatibilities actually exist.

With this PEP, it will be possible to reduce the dependency of binary
extension modules on a specific Python feature release, and applications
embedding Python can be made work with different releases.

Specification
=============

The ABI specification falls into two parts: an API specification,
specifying what function (groups) are available for use with the
ABI, and a linkage specification specifying what libraries to link
with. The actual ABI (layout of structures in memory, function
calling conventions) is not specified, but implied by the
compiler. As a recommendation, a specific ABI is recommended for
selected platforms.

During evolution of Python, new ABI functions will be added.
Applications using them will then have a requirement on a minimum
version of Python; this PEP provides no mechanism for such
applications to fall back when the Python library is too old.

Terminology
-----------

Applications and extension modules that want to use this ABI
are collectively referred to as "applications" from here on.

Header Files and Preprocessor Definitions
-----------------------------------------

Applications shall only include the header file Python.h (before
including any system headers), or, optionally, include pyconfig.h, and
then Python.h.

During the compilation of applications, the preprocessor macro
Py_LIMITED_API must be defined. Doing so will hide all definitions
that are not part of the ABI.

Structures
----------

Only the following structures and structure fields are accessible to
applications:

- PyObject (ob_refcnt, ob_type)
- PyVarObject (ob_base, ob_size)
- Py_buffer (buf, obj, len, itemsize, readonly, ndim, shape,
  strides, suboffsets, smalltable, internal)
- PyMethodDef (ml_name, ml_meth, ml_flags, ml_doc)
- PyMemberDef (name, type, offset, flags, doc)
- PyGetSetDef (name, get, set, doc, closure)

The accessor macros to these fields (Py_REFCNT, Py_TYPE, Py_SIZE)
are also available to applications.

The following types are available, but opaque (i.e. incomplete):

- PyThreadState
- PyInterpreterState

Type Objects
------------

The structure of type objects is not available to applications;
declaration of "static" type objects is not possible anymore
(for applications using this ABI).
Instead, type objects get created dynamically. To allow an
easy creation of types (in particular, to be able to fill out
function pointers easily), the following structures and functions
are available::

  typedef struct{
    int slot;    /* slot id, see below */
    void *pfunc; /* function pointer */
  } PyType_Slot;

  struct{
    const char* name;
    const char* doc;
    int basicsize;
    int itemsize;
    int flags;
    PyType_Slot *slots; /* terminated by slot==0. */
  } PyType_Spec;

  PyObject* PyType_FromSpec(PyType_Spec*);

To specify a slot, a unique slot id must be provided. New Python
versions may introduce new slot ids, but slot ids will never be
recycled. Slots may get deprecated, but continue to be supported
throughout Python 3.x.

The slot ids are named like the field names of the structures that
hold the pointers in Python 3.1, with an added ``Py_`` prefix (i.e.
Py_tp_dealloc instead of just tp_dealloc):

- tp_dealloc, tp_print, tp_getattr, tp_setattr, tp_repr,
  tp_hash, tp_call, tp_str, tp_getattro, tp_setattro,
  tp_doc, tp_traverse, tp_clear, tp_richcompare, tp_iter,
  tp_iternext, tp_methods, tp_base, tp_descr_set, tp_descr_set,
  tp_init, tp_alloc, tp_new, tp_is_gc, tp_bases, tp_del
- nb_add nb_subtract nb_multiply nb_remainder nb_divmod nb_power
  nb_negative nb_positive nb_absolute nb_bool nb_invert nb_lshift
  nb_rshift nb_and nb_xor nb_or nb_int nb_float nb_inplace_add
  nb_inplace_subtract nb_inplace_multiply nb_inplace_remainder
  nb_inplace_power nb_inplace_lshift nb_inplace_rshift nb_inplace_and
  nb_inplace_xor nb_inplace_or nb_floor_divide nb_true_divide
  nb_inplace_floor_divide nb_inplace_true_divide nb_index
- sq_length sq_concat sq_repeat sq_item sq_ass_item was_sq_ass_slice
  sq_contains sq_inplace_concat sq_inplace_repeat
- mp_length mp_subscript mp_ass_subscript
- bf_getbuffer bf_releasebuffer

XXX Not supported yet: tp_weaklistoffset, tp_dictoffset

The following fields cannot be set during type definition:
- tp_dict tp_mro tp_cache tp_subclasses tp_weaklist

Functions and function-like Macros
----------------------------------

All functions starting with _Py are not available to applications.
Also, all functions that expect parameter types that are unavailable
to applications are excluded from the ABI, such as PyAST_FromNode
(which expects a ``node*``).

All other functions are available, unless excluded below.

Function-like macros (in particular, field access macros) remain
available to applications, but get replaced by function calls
(unless their definition only refers to features of the ABI, such
as the various _Check macros)

ABI function declarations will not change their parameters or return
types. If a change to the signature becomes necessary, a new function
will be introduced. If the new function is source-compatible (e.g. if
just the return type changes), an alias macro may get added to
redirect calls to the new function when the applications is
recompiled.

If continued provision of the old function is not possible, it may get
deprecated, then removed, in accordance with PEP 7, causing
applications that use that function to break.

Excluded Functions
------------------

Functions declared in the following header files are not part
of the ABI:
- cellobject.h
- classobject.h
- code.h
- frameobject.h
- funcobject.h
- genobject.h
- pyarena.h
- pydebug.h
- symtable.h
- token.h
- traceback.h

Global Variables
----------------

Global variables representing types and exceptions are available
to applications.
XXX provide a complete list.

XXX should restrict list of globals to truly "builtin" stuff,
excluding everything that can also be looked up through imports.

XXX may specify access to predefined types and exceptions through
the interpreter state, with appropriate Get macros.

Other Macros
------------

All macros defining symbolic constants are available to applications;
the numeric values will not change.

In addition, the following macros are available:

- Py_BEGIN_ALLOW_THREADS, Py_BLOCK_THREADS, Py_UNBLOCK_THREADS,
  Py_END_ALLOW_THREADS

Linkage
-------

On Windows, applications shall link with python3.dll; an import
library python3.lib will be available. This DLL will redirect all of
its API functions through /export linker options to the full
interpreter DLL, i.e. python3y.dll.

XXX is it possible to redirect global variables in the same way?
If not, python3.dll would have to copy them, and we should verify
that all available global variables are read-only.

On Unix systems, the ABI is typically provided by the python
executable itself. PyModule_Create is changed to pass ``3`` as the API
version if the extension module was compiled with Py_LIMITED_API; the
version check for the API version will accept either 3 or the current
PYTHON_API_VERSION as conforming. If Python is compiled as a shared
library, it is installed as both libpython3.so, and libpython3.y.so;
applications conforming to this PEP should then link to the former.

XXX is it possible to make the soname libpython.so.3, and still
have some applications link to libpython3.y.so?

Implementation Strategy
=======================

This PEP will be implemented in a branch, allowing users to check
whether their modules conform to the ABI. To simplify this testing, an
additional macro Py_LIMITED_API_WITH_TYPES will expose the existing
type object layout, to let users postpone rewriting all types. When
the this branch is merged into the 3.2 code base, this macro will
be removed.

Copyright
=========

This document has been placed in the public domain.


From paul at boddie.org.uk  Sun May 17 17:27:55 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Sun, 17 May 2009 14:27:55 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
Message-ID: <1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>

On 17 Mai, 14:05, jer... at martinfamily.freeserve.co.uk wrote:
> From a user point of view I think that adding a 'par' construct to
> Python for parallel loops would add a lot of power and simplicity,
> e.g.
>
> par i in list:
> ? ? updatePartition(i)

You can do this right now with a small amount of work to make
updatePartition a callable which works in parallel, and without the
need for extra syntax. For example, with the pprocess module, you'd
use boilerplate like this:

  import pprocess
  queue = pprocess.Queue(limit=ncores)
  updatePartition = queue.manage(pprocess.MakeParallel
(updatePartition))

(See http://www.boddie.org.uk/python/pprocess/tutorial.html#Map for
details.)

At this point, you could use a normal "for" loop, and you could then
"sync" for results by reading from the queue. I'm sure it's a similar
story with the multiprocessing/processing module.

> There would be no locking and it would be the programmer's
> responsibility to ensure that the loop was truly parallel and correct.

Yes, that's the idea.

> The intention of this would be to speed up Python execution on multi-
> core platforms. Within a few years we will see 100+ core processors as
> standard and we need to be ready for that.

In what sense are we not ready? Perhaps the abstractions could be
better, but it's definitely possible to run Python code on multiple
cores today and get decent core utilisation.

> There could also be parallel versions of map, filter and reduce
> provided.

Yes, that's what pprocess.pmap is for, and I imagine that other
solutions offer similar facilities.

> BUT...none of this would be possible with the current implementation
> of Python with its Global Interpreter Lock, which effectively rules
> out true parallel processing.
>
> See:http://jessenoller.com/2009/02/01/python-threads-and-the-global-inter...
>
> What do others think?

That your last statement is false: true parallel processing is
possible today. See the Wiki for a list of solutions:

http://wiki.python.org/moin/ParallelProcessing

In addition, Jython and IronPython don't have a global interpreter
lock, so you have the option of using threads with those
implementations, too.

Paul


From dirkjan at ochtman.nl  Sun May 17 17:47:07 2009
From: dirkjan at ochtman.nl (Dirkjan Ochtman)
Date: Sun, 17 May 2009 23:47:07 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A107988.3020202@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>
Message-ID: <ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>

On Sun, May 17, 2009 at 10:54 PM, "Martin v. L?wis" <martin at v.loewis.de> wrote:
> Excluded Functions
> ------------------
>
> Functions declared in the following header files are not part
> of the ABI:
> - cellobject.h
> - classobject.h
> - code.h
> - frameobject.h
> - funcobject.h
> - genobject.h
> - pyarena.h
> - pydebug.h
> - symtable.h
> - token.h
> - traceback.h

What kind of effect does this have on optimization efforts, for
example all the stuff done by Antoine Pitrou over the last few months,
and the first few results from unladen? Will it mean we won't get to
the good optimizations until 4.0? Or does it just mean unladen swallow
takes longer to come back to trunk (until 4.0) and every extension
author who wants to be compatible with it will basically have the same
burden as now?

Cheers,

Dirkjan


From martin at v.loewis.de  Sun May 17 18:07:59 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Mon, 18 May 2009 00:07:59 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>
References: <4A107988.3020202@v.loewis.de>
	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>
Message-ID: <4A108ABF.9060909@v.loewis.de>

>> Functions declared in the following header files are not part
>> of the ABI:
>> - cellobject.h
>> - classobject.h
>> - code.h
>> - frameobject.h
>> - funcobject.h
>> - genobject.h
>> - pyarena.h
>> - pydebug.h
>> - symtable.h
>> - token.h
>> - traceback.h
> 
> What kind of effect does this have on optimization efforts, for
> example all the stuff done by Antoine Pitrou over the last few months,
> and the first few results from unladen? 

I fail to see the relationship, so: no effect that I can see.

Why do you think that optimization efforts could be related to
the PEP 384 proposal?

Regards,
Martin


From sebastian.serrano at gmail.com  Sun May 17 18:34:37 2009
From: sebastian.serrano at gmail.com (sserrano)
Date: Sun, 17 May 2009 15:34:37 -0700 (PDT)
Subject: Creating temperory files for a web application
References: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>
Message-ID: <2acf15d7-9a43-4199-a060-b7fcba705f92@g20g2000vba.googlegroups.com>

I would use a js plotting library, like http://code.google.com/p/flot/

On 8 mayo, 06:26, koranthala <koranth... at gmail.com> wrote:
> Hi,
> ? ?I am doing web development using Django. I need to create an image
> (chart) and show it to the users - based on some data which user
> selects.
> ? ?My question is - how do I create a temporary image for the user? I
> thought of tempfile, but I think it will be deleted once the process
> is done - which would happen by the time user starts seeing the image.
> I can think of no other option other than to have another script which
> will delete all images based on time of creation.
> ? ?Since python is extensively used for web development, I guess this
> should be an usual scenario for many people here. How do you usually
> handle this?



From dirkjan at ochtman.nl  Sun May 17 18:34:52 2009
From: dirkjan at ochtman.nl (Dirkjan Ochtman)
Date: Mon, 18 May 2009 00:34:52 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A108ABF.9060909@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>
	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>
	<4A108ABF.9060909@v.loewis.de>
Message-ID: <ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>

On Mon, May 18, 2009 at 12:07 AM, "Martin v. L?wis" <martin at v.loewis.de> wrote:
> I fail to see the relationship, so: no effect that I can see.
>
> Why do you think that optimization efforts could be related to
> the PEP 384 proposal?

It would seem to me that optimizations are likely to require data
structure changes, for exactly the kind of core data structures that
you're talking about locking down. But that's just a high-level view,
I might be wrong.

Cheers,

Dirkjan


From dinov at microsoft.com  Sun May 17 18:48:05 2009
From: dinov at microsoft.com (Dino Viehland)
Date: Sun, 17 May 2009 22:48:05 +0000
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>
References: <4A107988.3020202@v.loewis.de>
	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>
	<4A108ABF.9060909@v.loewis.de>
	<ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>
Message-ID: <1A472770E042064698CB5ADC83A12ACD016E82D6@TK5EX14MBXC116.redmond.corp.microsoft.com>

Dirkjan Ochtman wrote:
>
> It would seem to me that optimizations are likely to require data
> structure changes, for exactly the kind of core data structures that
> you're talking about locking down. But that's just a high-level view,
> I might be wrong.
>


In particular I would guess that ref counting is the biggest issue here.
I would think not directly exposing the field and having inc/dec ref
Functions (real methods, not macros) for it would give a lot more
ability to change the API in the future.

It also might make it easier for alternate implementations to support
the same API so some modules could work cross implementation - but I
suspect that's a non-goal of this PEP :).

Other fields directly accessed (via macros or otherwise) might have similar
problems but they don't seem as core as ref counting.

From martin at v.loewis.de  Sun May 17 18:53:00 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Mon, 18 May 2009 00:53:00 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>
References: <4A107988.3020202@v.loewis.de>	
	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>	
	<4A108ABF.9060909@v.loewis.de>
	<ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>
Message-ID: <4A10954C.6070401@v.loewis.de>

Dirkjan Ochtman wrote:
> On Mon, May 18, 2009 at 12:07 AM, "Martin v. L?wis" <martin at v.loewis.de> wrote:
>> I fail to see the relationship, so: no effect that I can see.
>>
>> Why do you think that optimization efforts could be related to
>> the PEP 384 proposal?
> 
> It would seem to me that optimizations are likely to require data
> structure changes, for exactly the kind of core data structures that
> you're talking about locking down. But that's just a high-level view,
> I might be wrong.

Ah. It's exactly the opposite: The purpose of the PEP is not to lock
the data structures down, but to allow more flexible evolution of
them - by completely hiding them from extension modules.

Currently, any data structure change must be weighed for its impact
on binary compatibility. With the PEP, changing structures can
be done fairly freely - with the exception of the very few structures
that do get locked down. In particular, the list of header files
that you quoted precisely contains the structures that can be
modified with no impact on the ABI.

I'm not aware that any of the structures that I propose to lock
would be relevant for optimization - but I might be wrong. If so,
I'd like to know, and it would be possible to add accessor functions
in cases where extension modules might still legitimately want to
access certain fields.

Certain changes to the VM would definitely be binary-incompatible,
such as removal of reference counting. However, such a change would
probably have a much wider effect, breaking not just binary
compatibility, but also source compatibility. It would be justified
to call a Python release that makes such a change 4.0.

Regards,
Martin


From egrefen at gmail.com  Sun May 17 18:53:07 2009
From: egrefen at gmail.com (Edward Grefenstette)
Date: Sun, 17 May 2009 15:53:07 -0700 (PDT)
Subject: Help with Tkinter on OS X --- driving me insane!
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
Message-ID: <f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>

I thought of this. I uninstalled Tk from macports, but the same error
crops up. Evidently, Tk 8.5 remains installed somewhere else, but I
don't know where. How can I find out?

Best,
Edward

>
>
> Have you installed Tk version 8.5?
>
> If so, remove it. You might also install the latest 8.4 version.
> --
> Piet van Oostrum <p... at cs.uu.nl>
> URL:http://pietvanoostrum.com[PGP 8DAE142BE17999C4]
> Private email: p... at vanoostrum.org



From martin at v.loewis.de  Sun May 17 19:04:21 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Mon, 18 May 2009 01:04:21 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <1A472770E042064698CB5ADC83A12ACD016E82D6@TK5EX14MBXC116.redmond.corp.microsoft.com>
References: <4A107988.3020202@v.loewis.de>	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>	<4A108ABF.9060909@v.loewis.de>
	<ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>
	<1A472770E042064698CB5ADC83A12ACD016E82D6@TK5EX14MBXC116.redmond.corp.microsoft.com>
Message-ID: <4A1097F5.2050009@v.loewis.de>

Dino Viehland wrote:
> Dirkjan Ochtman wrote:
>> It would seem to me that optimizations are likely to require data
>> structure changes, for exactly the kind of core data structures that
>> you're talking about locking down. But that's just a high-level view,
>> I might be wrong.
>>
> 
> 
> In particular I would guess that ref counting is the biggest issue here.
> I would think not directly exposing the field and having inc/dec ref
> Functions (real methods, not macros) for it would give a lot more
> ability to change the API in the future.

In the context of optimization, I'm skeptical that introducing functions
for the reference counting would be useful. Making the INCREF/DECREF
macros functions just in case the reference counting goes away is IMO
an unacceptable performance cost.

Instead, such a change should go through the regular deprecation
procedure and/or cause the release of Python 4.0.

> It also might make it easier for alternate implementations to support
> the same API so some modules could work cross implementation - but I
> suspect that's a non-goal of this PEP :).

Indeed :-) I'm also skeptical that this would actually allow
cross-implementation modules to happen. The list of functions that
an alternate implementation would have to provide is fairly long.

The memory management APIs in particular also assume a certain layout
of Python objects in general, namely that they start with a header
whose size is a compile-time constant. Again, making this more flexible
"just in case" would also impact performance, and probably fairly badly
so.

> Other fields directly accessed (via macros or otherwise) might have similar
> problems but they don't seem as core as ref counting.

Access to the type object reference is probably similar. All the other
structs are used "directly" in C code, with no accessor macros.

Regards,
Martin


From aljosa.mohorovic at gmail.com  Sun May 17 19:14:06 2009
From: aljosa.mohorovic at gmail.com (Aljosa Mohorovic)
Date: Sun, 17 May 2009 16:14:06 -0700 (PDT)
Subject: http://orbited.org/ - anybody using it?
Message-ID: <471d72a1-f1d3-4feb-a692-c3d62ec41ce9@n4g2000vba.googlegroups.com>

can anybody comment on http://orbited.org/ ?
is it an active project? does it work?

Aljosa Mohorovic


From skrobul at skrobul.com  Sun May 17 19:20:54 2009
From: skrobul at skrobul.com (skrobul)
Date: Sun, 17 May 2009 16:20:54 -0700 (PDT)
Subject: how to verify SSL certificate chain  -  M2 Crypto library?
Message-ID: <6862c613-8d4d-440c-b656-0bba165aef8f@s21g2000vbb.googlegroups.com>

Hi,

is there any simple way to do SSL certificate chain validation using
M2Crypto or any other library ?

Basically what I want to achieve is to be able to say if certificate
chain contained in 'XYZ.pem' file is issued by known CA (list of
common root-CA's certs should be loaded from separate directory).
Right now I do it by spawning command 'openssl verify -CApath
<ca_certs_path> XYZ.pem' and it works. However I think that there must
be a simpler way.

 I've spent last few hours trying to go through M2Crypto sources and
API "documentation" but the only possible way that I've found is
spawning separate server thread listening on some port, and connecting
just to verify if cert chain is valid, but going this way is at least
not right. The other approach which I've tried is using low-level
function m2.X509_verify() but it does not work as I expect. It returns
0 (which means valid) even if CA certificate is not known.

Any suggestions / tips ?

thanks,
Marek Skrobacki


From steve at REMOVE-THIS-cybersource.com.au  Sun May 17 19:26:14 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 17 May 2009 23:26:14 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de>
	<02204669$0$25303$c3e8da3@news.astraweb.com>
	<77b3koF1go3t7U1@mid.uni-berlin.de>
Message-ID: <02209010$0$25303$c3e8da3@news.astraweb.com>

On Sun, 17 May 2009 20:34:00 +0200, Diez B. Roggisch wrote:

>>> My math-skills are a bit too rusty to qualify the exact nature of the
>>> operation, commutativity springs to my mind.
>> 
>> And how is reduce() supposed to know whether or not some arbitrary
>> function is commutative?
> 
> I don't recall anybody saying it should know that - do you? The OP wants
> to introduce parallel variants, not replace the existing ones.

Did I really need to spell it out? From context, I'm talking about the 
*parallel version* of reduce().



-- 
Steven


From foom at fuhm.net  Sun May 17 19:35:59 2009
From: foom at fuhm.net (James Y Knight)
Date: Sun, 17 May 2009 19:35:59 -0400
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A107988.3020202@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>
Message-ID: <64C7B6A8-2273-4A41-9CFA-72B7B1D05361@fuhm.net>


On May 17, 2009, at 4:54 PM, Martin v. L?wis wrote:
> Currently, each feature release introduces a new name for the
> Python DLL on Windows, and may cause incompatibilities for extension
> modules on Unix. This PEP proposes to define a stable set of API
> functions which are guaranteed to be available for the lifetime
> of Python 3, and which will also remain binary-compatible across
> versions. Extension modules and applications embedding Python
> can work with different feature releases as long as they restrict
> themselves to this stable ABI.


It seems like a good ideal to strive for.

But I think this is too strong a promise. IMO it would be better to  
say that ABI compatibility across releases is a goal. If someone does  
make a change that breaks the ABI, I'd expect whomever is proposing it  
to put forth a fairly strong argument towards why it's a worthwhile  
change. But it should be possible and allowed, given the right  
circumstances. Because I think it's pretty much inevitable that it  
*will* need to happen, sometime.

(of course there will need to be ABI tests, so that any potential ABI  
breakages are known about when they occur)

Python is much more defined by its source language than its C  
extension API, so tying the python major version number to the C ABI  
might not be the best idea from a "marketing" standpoint. (I can see  
it now..."Python 4.0 major new features: we changed the C method  
definition struct layout incompatibly" :)

James

From fuzzyman at voidspace.org.uk  Sun May 17 19:53:12 2009
From: fuzzyman at voidspace.org.uk (Michael Foord)
Date: Mon, 18 May 2009 00:53:12 +0100
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A1097F5.2050009@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>	<4A108ABF.9060909@v.loewis.de>	<ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>	<1A472770E042064698CB5ADC83A12ACD016E82D6@TK5EX14MBXC116.redmond.corp.microsoft.com>
	<4A1097F5.2050009@v.loewis.de>
Message-ID: <4A10A368.1060406@voidspace.org.uk>

Martin v. L?wis wrote:
> Dino Viehland wrote:
>   
>> Dirkjan Ochtman wrote:
>>     
>>> It would seem to me that optimizations are likely to require data
>>> structure changes, for exactly the kind of core data structures that
>>> you're talking about locking down. But that's just a high-level view,
>>> I might be wrong.
>>>
>>>       
>> In particular I would guess that ref counting is the biggest issue here.
>> I would think not directly exposing the field and having inc/dec ref
>> Functions (real methods, not macros) for it would give a lot more
>> ability to change the API in the future.
>>     
>
> In the context of optimization, I'm skeptical that introducing functions
> for the reference counting would be useful. Making the INCREF/DECREF
> macros functions just in case the reference counting goes away is IMO
> an unacceptable performance cost.
>
> Instead, such a change should go through the regular deprecation
> procedure and/or cause the release of Python 4.0.
>
>   
>> It also might make it easier for alternate implementations to support
>> the same API so some modules could work cross implementation - but I
>> suspect that's a non-goal of this PEP :).
>>     
>
> Indeed :-) I'm also skeptical that this would actually allow
> cross-implementation modules to happen. The list of functions that
> an alternate implementation would have to provide is fairly long.
>
>   

Just in case you're unaware of it; the company I work for has an open 
source project called Ironclad. This *is* a reimplementation of the 
Python C API and gives us binary compatibility with [some subset of] 
Python C extensions for use from IronPython.

http://www.resolversystems.com/documentation/index.php/Ironclad.html

It's an ambitious project but it is now at the stage where 1000s of the 
Numpy and Scipy tests pass when run from IronPython. I don't think this 
PEP impacts the project, but it is not completely unfeasible for the 
alternative implementations to do this.

In particular we have had to address the issue of the GIL and extensions 
(IronPython has no GIL) and reference counting (which IronPython also 
doesn't) use.

Michael Foord



-- 
http://www.ironpythoninaction.com/
http://www.voidspace.org.uk/blog




From kw at codebykevin.com  Sun May 17 19:58:16 2009
From: kw at codebykevin.com (Kevin Walzer)
Date: Sun, 17 May 2009 19:58:16 -0400
Subject: Help with Tkinter on OS X --- driving me insane!
In-Reply-To: <f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
	<f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
Message-ID: <4A10A498.8040100@codebykevin.com>

Edward Grefenstette wrote:
> I thought of this. I uninstalled Tk from macports, but the same error
> crops up. Evidently, Tk 8.5 remains installed somewhere else, but I
> don't know where. How can I find out?
> 
> Best,
> Edward
> 

Look in /Library/Frameworks...

Kevin Walzer
Code by Kevin
http://www.codebykevin.com


From steve at REMOVE-THIS-cybersource.com.au  Sun May 17 20:04:45 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 18 May 2009 00:04:45 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<mailman.290.1242577147.8015.python-list@python.org>
	<02204763$0$25303$c3e8da3@news.astraweb.com>
	<77b3pkF1go3t7U2@mid.uni-berlin.de>
Message-ID: <02209917$0$25303$c3e8da3@news.astraweb.com>

On Sun, 17 May 2009 20:36:36 +0200, Diez B. Roggisch wrote:

>> But reduce() can't tell whether the function being applied is
>> commutative or not. I suppose it could special-case a handful of
>> special cases (e.g. operator.add for int arguments -- but not floats!)
>> or take a caller- supplied argument that tells it whether the function
>> is commutative or not. But in general, you can't assume the function
>> being applied is commutative or associative, so unless you're willing
>> to accept undefined behaviour, I don't see any practical way of
>> parallelizing reduce().
> 
> def reduce(operation, sequence, startitem=None, parallelize=False)
> 
> should be enough. Approaches such as OpenMP also don't guess, they use
> explicit annotations.

It would be nice if the OP would speak up and tell us what he intended, 
so we didn't have to guess what he meant. We're getting further and 
further away from his original suggestion of a "par" loop.

If you pass parallize=True, then what? Does it assume that operation is 
associative, or take some steps to ensure that it is? Does it guarantee 
to perform the operations in a specific order, or will it potentially 
give non-deterministic results depending on the order that individual 
calculations come back?

As I said earlier, parallelizing map() sounds very plausible to me, but 
the approaches that people have talked about for parallelizing reduce() 
so far sound awfully fragile and magically to me. But at least I've 
learned one thing: given an associative function, you *can* parallelize 
reduce using a tree. (Thanks Roy!)



-- 
Steven


From nad at acm.org  Sun May 17 20:09:07 2009
From: nad at acm.org (Ned Deily)
Date: Sun, 17 May 2009 17:09:07 -0700
Subject: Help with Tkinter on OS X --- driving me insane!
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
	<f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
Message-ID: <nad-57E73C.17090717052009@news.gmane.org>

In article 
<f9435b73-5001-48d9-b2e8-6fd8663396e7 at l32g2000vba.googlegroups.com>,
 Edward Grefenstette <egrefen at gmail.com> wrote:
> I thought of this. I uninstalled Tk from macports, but the same error
> crops up. Evidently, Tk 8.5 remains installed somewhere else, but I
> don't know where. How can I find out?

Look in /Library/Frameworks for Tcl.framework and Tk.framework.  You can 
safely delete those if you don't need them.  But also make sure you 
update to the latest 2.6 (currently 2.6.2) python.org version; as noted, 
the original 2.6 python.org release had issues with user-installed Tcl 
and Tk frameworks.

-- 
 Ned Deily,
 nad at acm.org



From andrew at acooke.org  Sun May 17 20:20:58 2009
From: andrew at acooke.org (andrew cooke)
Date: Sun, 17 May 2009 20:20:58 -0400 (CLT)
Subject: Generic web parser
In-Reply-To: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
References: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
Message-ID: <d18bd43aa982b99a1d165cae1bf1738c.squirrel@acooke.dyndns.org>


http://groups.google.com/group/beautifulsoup/browse_thread/thread/d416dd19fdaa43a6

http://jjinux.blogspot.com/2008/10/python-some-notes-on-lxml.html

andrew




From egrefen at gmail.com  Sun May 17 21:06:55 2009
From: egrefen at gmail.com (Edward Grefenstette)
Date: Sun, 17 May 2009 18:06:55 -0700 (PDT)
Subject: Help with Tkinter on OS X --- driving me insane!
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
	<f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
	<mailman.307.1242605361.8015.python-list@python.org>
Message-ID: <f2f2ff3e-f314-468d-9fdd-8bf883fb9723@n4g2000vba.googlegroups.com>

Thanks to Kevin and Ned for the pointers.
The question is now this. Running find tells me I have tk.h in the
following locations:
===
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Tk.framework/
Versions/8.4/Headers/tk.h
/Developer/SDKs/MacOSX10.4u.sdk/usr/include/tk.h
/Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Tk.framework/
Versions/8.4/Headers/tk.h
/Developer/SDKs/MacOSX10.5.sdk/usr/include/tk.h
/Library/Frameworks/Tk.framework/Versions/8.5/Headers/tk.h
/System/Library/Frameworks/Tk.framework/Versions/8.4/Headers/tk.h
/usr/include/tk.h
/usr/local/WordNet-3.0/include/tk/tk.h
===

This seams to entail that the Tk 8.4 framework seems to be installed
in
===
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Tk.framework/
Versions/8.4/
/Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Tk.framework/
Versions/8.4/Headers/tk.h
/System/Library/Frameworks/Tk.framework/Versions/8.4/Headers/tk.h
===

Whereas Tk 8.5 is installed in:
===
/Library/Frameworks/Tk.framework/Versions/8.5/
===

Which ones should I delete? Should I remove all the other tk.h files?

Sorry if these are rather dumb questions, but I really do appreciate
the help.

Best,
Edward

On May 18, 1:09?am, Ned Deily <n... at acm.org> wrote:
> In article
> <f9435b73-5001-48d9-b2e8-6fd866339... at l32g2000vba.googlegroups.com>,
> ?Edward Grefenstette <egre... at gmail.com> wrote:
>
> > I thought of this. I uninstalled Tk from macports, but the same error
> > crops up. Evidently, Tk 8.5 remains installed somewhere else, but I
> > don't know where. How can I find out?
>
> Look in /Library/Frameworks for Tcl.framework and Tk.framework. ?You can
> safely delete those if you don't need them. ?But also make sure you
> update to the latest 2.6 (currently 2.6.2) python.org version; as noted,
> the original 2.6 python.org release had issues with user-installed Tcl
> and Tk frameworks.
>
> --
> ?Ned Deily,
> ?n... at acm.org



From kw at codebykevin.com  Sun May 17 21:27:37 2009
From: kw at codebykevin.com (Kevin Walzer)
Date: Sun, 17 May 2009 21:27:37 -0400
Subject: Help with Tkinter on OS X --- driving me insane!
In-Reply-To: <f2f2ff3e-f314-468d-9fdd-8bf883fb9723@n4g2000vba.googlegroups.com>
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
	<f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
	<mailman.307.1242605361.8015.python-list@python.org>
	<f2f2ff3e-f314-468d-9fdd-8bf883fb9723@n4g2000vba.googlegroups.com>
Message-ID: <4A10B989.5020709@codebykevin.com>

Edward Grefenstette wrote:

> 
> Whereas Tk 8.5 is installed in:
> ===
> /Library/Frameworks/Tk.framework/Versions/8.5/
> ===
>

Delete this one if you want to ensure that Python sees 8.4.

-- 
Kevin Walzer
Code by Kevin
http://www.codebykevin.com


From egrefen at gmail.com  Sun May 17 22:32:49 2009
From: egrefen at gmail.com (Edward Grefenstette)
Date: Sun, 17 May 2009 19:32:49 -0700 (PDT)
Subject: Help with Tkinter on OS X --- driving me insane!
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
	<f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
	<mailman.307.1242605361.8015.python-list@python.org>
	<f2f2ff3e-f314-468d-9fdd-8bf883fb9723@n4g2000vba.googlegroups.com>
	<4A10B989.5020709@codebykevin.com>
Message-ID: <c094cd74-78a3-46dc-9a53-6da08c19e7d3@o30g2000vbc.googlegroups.com>

Bingo! Updating to Python 6.2.2 did the trick (I had 6.2). I just had
to relink the /usr/bin/python to the Current directory in /Library/
Frameworks/Python.framework/Versions/ and everything worked without
deletions etc. Thanks for your help, everyone!

Best,
Edward


From agaskins_ng at kelleramerica.com  Sun May 17 22:33:38 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Mon, 18 May 2009 02:33:38 GMT
Subject: Generating Tones With Python
Message-ID: <6O3Ql.26152$ho7.16117@newsfe10.iad>

I am pretty sure this shouldn't be as hard as I'm making it to be, but 
how does one go about generating tones of specific frequency, volume, and 
L/R pan? I've been digging around the internet for info, and found a few 
examples. One was with gstreamer, but I can't find much in the 
documentation to explain how to do this. Also some people said to use 
tksnack snack, but the one example I found to do this didn't do  anything 
on my machine, no error or sounds. I'd like this to be cross platform, 
but at this point I just want to do it any way I can.

Thanks,
-Adam


From nad at acm.org  Sun May 17 22:58:05 2009
From: nad at acm.org (Ned Deily)
Date: Sun, 17 May 2009 19:58:05 -0700
Subject: Help with Tkinter on OS X --- driving me insane!
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
	<f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
	<mailman.307.1242605361.8015.python-list@python.org>
	<f2f2ff3e-f314-468d-9fdd-8bf883fb9723@n4g2000vba.googlegroups.com>
	<4A10B989.5020709@codebykevin.com>
	<c094cd74-78a3-46dc-9a53-6da08c19e7d3@o30g2000vbc.googlegroups.com>
Message-ID: <nad-96E90D.19580517052009@news.gmane.org>

In article 
<c094cd74-78a3-46dc-9a53-6da08c19e7d3 at o30g2000vbc.googlegroups.com>,
 Edward Grefenstette <egrefen at gmail.com> wrote:
> Bingo! Updating to Python 6.2.2 did the trick (I had 6.2). I just had
> to relink the /usr/bin/python to the Current directory in /Library/
> Frameworks/Python.framework/Versions/ and everything worked without
> deletions etc. Thanks for your help, everyone!

Glad that helped but beware: changing /usr/bin/python is not 
recommended.  That link (and everything else in /usr/bin) is maintained 
by Apple and should always point to the OSX-supplied python at
/System/Library/Python.framework/Versions/2.5/bin/python

By default, the python.org installers create links at 
/usr/local/bin/python and /usr/local/bin/python2.6; use one of those 
paths to get to the python.org 2.6 or ensure /usr/local/bin comes before 
/usr/bin on your $PATH.

-- 
 Ned Deily,
 nad at acm.org



From Wwy58 at yahoo.com  Sun May 17 23:51:44 2009
From: Wwy58 at yahoo.com (David)
Date: Sun, 17 May 2009 20:51:44 -0700 (PDT)
Subject: Python mail truncate problem
Message-ID: <4db625fe-158d-4b04-af0b-23e54c3ae22b@e23g2000vbe.googlegroups.com>

Hi,

I am writing Python script to process e-mails in a user's mail
account. What I want to do is to update that e-mail's Status to 'R'
after processing it, however, the following script truncates old e-
mails even though it updates that e-mail's Status correctly. Anybody
knows how to fix this?

Thanks so much.

  fp = '/var/spool/mail/' + user
                mbox = mailbox.mbox(fp)

                for key, msg in mbox.iteritems():
                        flags = msg.get_flags()

                        if 'R' not in flags:
                                # now process the e-mail
                                # now update status
                                msg.add_flag('R' + flags)
                                mbox[key] = msg



From wuwei23 at gmail.com  Mon May 18 00:24:06 2009
From: wuwei23 at gmail.com (alex23)
Date: Sun, 17 May 2009 21:24:06 -0700 (PDT)
Subject: http://orbited.org/ - anybody using it?
References: <471d72a1-f1d3-4feb-a692-c3d62ec41ce9@n4g2000vba.googlegroups.com>
Message-ID: <d13b1e1a-1dd9-496f-a11c-199b0c22ab74@j18g2000prm.googlegroups.com>

On May 18, 9:14?am, Aljosa Mohorovic <aljosa.mohoro... at gmail.com>
wrote:
> can anybody comment onhttp://orbited.org/?
> is it an active project? does it work?

I have no idea about your second question but looking at PyPI,the
module was last updated on the 9th of this much, so I'd say it's very
much an active project:

http://pypi.python.org/pypi/orbited/0.7.9


From matusu at gmail.com  Mon May 18 00:39:14 2009
From: matusu at gmail.com (Matus)
Date: Mon, 18 May 2009 06:39:14 +0200
Subject: Generating Tones With Python
In-Reply-To: <6O3Ql.26152$ho7.16117@newsfe10.iad>
References: <6O3Ql.26152$ho7.16117@newsfe10.iad>
Message-ID: <4A10E672.9060401@gmail.com>

try http://www.pygame.org, as far as I remember there is a way to
generate sound arrays though not sure aboout the pan

m

Adam Gaskins wrote:
> I am pretty sure this shouldn't be as hard as I'm making it to be, but 
> how does one go about generating tones of specific frequency, volume, and 
> L/R pan? I've been digging around the internet for info, and found a few 
> examples. One was with gstreamer, but I can't find much in the 
> documentation to explain how to do this. Also some people said to use 
> tksnack snack, but the one example I found to do this didn't do  anything 
> on my machine, no error or sounds. I'd like this to be cross platform, 
> but at this point I just want to do it any way I can.
> 
> Thanks,
> -Adam


From notontheweb at noisp.com  Mon May 18 01:18:12 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Sun, 17 May 2009 22:18:12 -0700
Subject: Which C compiler?
Message-ID: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>

I am using Python 2.4.  I need to make a native Python extension for 
Windows XP.  I have both VC++ 6.0 and Visual C++ 2005 Express Edition. 
Will VC++ 6.0 do the trick?  That would be easier for me, because the 
project is written for that one.  If not, will the 2005 compiler do it?

Thanks much,
"Jive"


From notontheweb at noisp.com  Mon May 18 01:27:39 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Sun, 17 May 2009 22:27:39 -0700
Subject: Which C compiler?
In-Reply-To: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>
Message-ID: <fl6Ql.345236$UQ6.184175@en-nntp-03.dc1.easynews.com>

P.s. I just found out that there's a new Express edition, 2008. (New to 
me, that is.)  I'm installing it.


From martin at v.loewis.de  Mon May 18 02:00:57 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Mon, 18 May 2009 08:00:57 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A10A368.1060406@voidspace.org.uk>
References: <4A107988.3020202@v.loewis.de>	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>	<4A108ABF.9060909@v.loewis.de>	<ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>	<1A472770E042064698CB5ADC83A12ACD016E82D6@TK5EX14MBXC116.redmond.corp.microsoft.com>
	<4A1097F5.2050009@v.loewis.de> <4A10A368.1060406@voidspace.org.uk>
Message-ID: <4A10F999.5050106@v.loewis.de>

>>> It also might make it easier for alternate implementations to support
>>> the same API so some modules could work cross implementation - but I
>>> suspect that's a non-goal of this PEP :).
>>>     
>>
>> Indeed :-) I'm also skeptical that this would actually allow
>> cross-implementation modules to happen. The list of functions that
>> an alternate implementation would have to provide is fairly long.
>>
>>   
> 
> Just in case you're unaware of it; the company I work for has an open
> source project called Ironclad.

I was unaware indeed; thanks for pointing this out.

IIUC, it's not just an API emulation, but also an ABI emulation.

> In particular we have had to address the issue of the GIL and extensions
> (IronPython has no GIL) and reference counting (which IronPython also
> doesn't) use.

I think this somewhat strengthens the point I was trying to make: An
alternate implementation that tries to be API compatible has to consider
so many things that it is questionable whether making Py_INCREF/DECREF
functions would be any simplification.

So I just ask:
a) Would it help IronClad if it could restrict itself to PEP 384
   compatible modules?
b) Would further restrictions in the PEP help that cause?

Regards,
Martin


From research at johnohagan.com  Mon May 18 02:33:03 2009
From: research at johnohagan.com (John O'Hagan)
Date: Mon, 18 May 2009 06:33:03 +0000
Subject: Generating Tones With Python
In-Reply-To: <6O3Ql.26152$ho7.16117@newsfe10.iad>
References: <6O3Ql.26152$ho7.16117@newsfe10.iad>
Message-ID: <200905180633.03992.research@johnohagan.com>

On Mon, 18 May 2009, Adam Gaskins wrote:
> I am pretty sure this shouldn't be as hard as I'm making it to be, but
> how does one go about generating tones of specific frequency, volume, and
> L/R pan? I've been digging around the internet for info, and found a few
> examples. One was with gstreamer, but I can't find much in the
> documentation to explain how to do this. Also some people said to use
> tksnack snack, but the one example I found to do this didn't do  anything
> on my machine, no error or sounds. I'd like this to be cross platform,
> but at this point I just want to do it any way I can.
[...]

I've done this using the subprocess module to call the sox program (which has 
a built-in synth to generate customisable tones, and can play sound files) or 
using the socket module to send control messages to a running instance of the 
fluidsynth program (which can generate sound using soundfonts). The former is 
very simple, the latter is very responsive to quick changes. I think both 
programs are cross-platform.

HTH,

John


From usernet at ilthio.net  Mon May 18 02:33:59 2009
From: usernet at ilthio.net (Tim Harig)
Date: Mon, 18 May 2009 06:33:59 GMT
Subject: Generating Tones With Python
References: <6O3Ql.26152$ho7.16117@newsfe10.iad>
Message-ID: <rj7Ql.16450$hc1.12050@flpi150.ffdc.sbc.com>

On 2009-05-18, Adam Gaskins <agaskins_ng at kelleramerica.com> wrote:
> I am pretty sure this shouldn't be as hard as I'm making it to be, but 
> how does one go about generating tones of specific frequency, volume, and 
> L/R pan? I've been digging around the internet for info, and found a few 

This can be done with SDL which would be my first suggestion.
There doesn't seem to be a direct Python SDL module but pygame seems to
encompass the SDL interface.  If that doesn't work for you might be able
to write python wrappers and the C SDL functions.

A second option, on Windows, may be to interface DirectX.  This would not
be cross platform and I don't personally know anything about it; but, it
should be possible to work with DirectX.  I found this with a Google
search:

http://directpython.sourceforge.net/


Finally, if all else fails you can generate the PCM directly and pipe it to
an external interface.  I have never actually written anything that
actually output sounds directly; but, I have written a module to generate
morse tones wave files:

info:
	http://ilthio.net/page.cgi?doc=n20
script:
	http://ilthio.net/page.cgi?txt=cw.py

Look inside of the oscillator class.  I used an 8bit samplewidth with
1 channel to save space (I originally did implement it in 16bit mono).
To do more complex sounds, you will probably need to a 16 bit channel.
Note that 8bit wave files use unsigned integer values, little endian while
16 bit wave files use signed integers, little endian, two's compliment.
For L/R pan, you will also need to create the second channel waveform.  You
can easily find good references for the different wave file PCM formats
with a search engine query.

If the SDL interface doesn't work for you, then you might be able to
generate a PCM format and pipe it to an external player.  In this scenerio
you would likely ignore actually creating the wave file.  You would instead
just create the raw PCM format inside of the array container and then
pipe bits of it out to the wave player program.  Without the format data
contained in the RIFF header of the wave file, you will need to inform
the player as to exactly what format you will be feeding it.  Most Unix
players have command line options that will allow you to specify the
format.  I am not sure whether Windows based players allow similar
options.  Under Linux, you could pipe the stream directly to the sound
card device inteface file in the /dev filesystem if you know what bitrate
the soundcard uses internally.

This would likely require a second process or second thread to make sure
that you can feed the PCM output in real time.


From stefan_ml at behnel.de  Mon May 18 02:54:53 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 18 May 2009 08:54:53 +0200
Subject: Conceptual flaw in pxdom?
In-Reply-To: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
Message-ID: <4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>

Emanuele D'Arrigo wrote:
> I'm looking at pxdom and in particular at its foundation class
> DOMObject

I didn't know pxdom, but looking at it now I can see that it hasn't been
updated since 2006. Not sure if that means that it is complete or that it
has been abandoned.

Anyway, seeing that it only provides DOM compliance, without anything
further like XPath or whatever, and that it doesn't focus on performance in
any way, you might still be better off with ElementTree, which is in the
stdlib since Python 2.5 (and available for Py2.2+).

Stefan


From martin at v.loewis.de  Mon May 18 03:07:27 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Mon, 18 May 2009 09:07:27 +0200
Subject: Which C compiler?
In-Reply-To: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>
Message-ID: <4a11092f$0$30903$9b622d9e@news.freenet.de>

Jive Dadson wrote:
> I am using Python 2.4.  I need to make a native Python extension for
> Windows XP.  I have both VC++ 6.0 and Visual C++ 2005 Express Edition.
> Will VC++ 6.0 do the trick?  That would be easier for me, because the
> project is written for that one.  If not, will the 2005 compiler do it?

In general, to build extension modules, you need to use the same VC
version as the one that was used to build Python. For 2.4, that would
be Visual Studio 2003. So if you use VC 6, VS 2005, or VS 2008, you
may run into problems.

Depending on what exactly the extension module does, it might work
fine also.

Regards,
Martin


From eckhardt at satorlaser.com  Mon May 18 03:31:33 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 18 May 2009 09:31:33 +0200
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
Message-ID: <mff7e6-e43.ln1@satorlaser.homedns.org>

Steve Ferg wrote:
> On the one hand, there are developers who love big IDEs with lots of
> features (code generation, error checking, etc.), and rely on them to
> provide the high level of support needed to be reasonably productive
> in heavy-weight languages (e.g. Java).
> 
> On the other hand there are developers who much prefer to keep things
> light-weight and simple.  They like clean high-level languages (e.g.
> Python) which are compact enough that you can keep the whole language
> in your head, and require only a good text editor to be used
> effectively.

This distinction is IMHO not correct. If you took a look at Java, you would
notice that the core language syntax is much simpler than Python's. OTOH,
if you add the standard libraries, you would soon see that Python's
libraries are not as consistent (i.e. conformant to PEP8) as Java's.

What makes up for Python's perceived usability problems though is the
commandline parser that allows you to inspect the type of an object and its
parts of it at runtime, in particular the docstrings are a treasure there.

That said, an IDE that provides auto-completion (e.g. that gives you a list
of available class members) is a good thing in Java, because you don't have
to browse the documentation as often. With Python, that is impossible
because there are no types bound to parameters, so any type that fits is
allowed (duck typing).

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From boblatest at googlemail.com  Mon May 18 03:51:43 2009
From: boblatest at googlemail.com (boblatest at googlemail.com)
Date: Mon, 18 May 2009 00:51:43 -0700 (PDT)
Subject: How to convert a list of strings to a tuple of floats?
Message-ID: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>

Hello group,

this is the conversion I'm looking for:

['1.1', '2.2', '3.3'] -> (1.1, 2.2, 3.3)

Currently I'm "disassembling" the list by hand, like this:

    fields = line.split('; ')
    for x in range(len(fields)):
        fields[x] = float(fields[x])
    ftuple = tuple(fields)

Of course it works, but it looks inelegant. Is there a more Pythonisch
way of doing this? In C I'd just use sscanf.

robert


From wuwei23 at gmail.com  Mon May 18 03:58:59 2009
From: wuwei23 at gmail.com (alex23)
Date: Mon, 18 May 2009 00:58:59 -0700 (PDT)
Subject: How to convert a list of strings to a tuple of floats?
References: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
Message-ID: <1a610e05-9278-4ffa-96c9-eb919239a206@g31g2000pra.googlegroups.com>

On May 18, 5:51?pm, "boblat... at googlemail.com"
<boblat... at googlemail.com> wrote:
> ['1.1', '2.2', '3.3'] -> (1.1, 2.2, 3.3)
>
> Currently I'm "disassembling" the list by hand, like this:
>
> ? ? fields = line.split('; ')
> ? ? for x in range(len(fields)):
> ? ? ? ? fields[x] = float(fields[x])
> ? ? ftuple = tuple(fields)
>
> Of course it works, but it looks inelegant. Is there a more Pythonisch
> way of doing this? In C I'd just use sscanf.

Either:

    ftuple = tuple(map(float, fields))

Or the BDFL-endorsed:

    ftuple = tuple(float(f) for f in fields)


From clp2 at rebertia.com  Mon May 18 04:00:10 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 18 May 2009 01:00:10 -0700
Subject: How to convert a list of strings to a tuple of floats?
In-Reply-To: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
References: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
Message-ID: <50697b2c0905180100p5efa05e1ked09ec08a63a1218@mail.gmail.com>

On Mon, May 18, 2009 at 12:51 AM, boblatest at googlemail.com
<boblatest at googlemail.com> wrote:
> Hello group,
>
> this is the conversion I'm looking for:
>
> ['1.1', '2.2', '3.3'] -> (1.1, 2.2, 3.3)
>
> Currently I'm "disassembling" the list by hand, like this:
>
> ? ?fields = line.split('; ')
> ? ?for x in range(len(fields)):
> ? ? ? ?fields[x] = float(fields[x])
> ? ?ftuple = tuple(fields)
>
> Of course it works, but it looks inelegant. Is there a more Pythonisch
> way of doing this? In C I'd just use sscanf.

ftuple = tuple(float(field) for field in fields)

See the docs on "generator expressions" for more info.

Cheers,
Chris
-- 
http://blog.rebertia.com


From eckhardt at satorlaser.com  Mon May 18 04:06:48 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 18 May 2009 10:06:48 +0200
Subject: How to convert a list of strings to a tuple of floats?
References: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
Message-ID: <phh7e6-p83.ln1@satorlaser.homedns.org>

boblatest at googlemail.com wrote:
> this is the conversion I'm looking for:
> 
> ['1.1', '2.2', '3.3'] -> (1.1, 2.2, 3.3)
> 
> Currently I'm "disassembling" the list by hand, like this:
> 
>     fields = line.split('; ')
>     for x in range(len(fields)):
>         fields[x] = float(fields[x])
>     ftuple = tuple(fields)
> 
> Of course it works, but it looks inelegant.

temp = map(float, x)
ftuple = tuple(temp)

Of course this is also possible to write in a single line.

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From jeremiah.dodds at gmail.com  Mon May 18 04:29:54 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Mon, 18 May 2009 09:29:54 +0100
Subject: Generic web parser
In-Reply-To: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
References: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
Message-ID: <12cbbbfc0905180129m13d3f89bt588be8c08d96be35@mail.gmail.com>

On Sat, May 16, 2009 at 2:18 PM, S.Selvam <s.selvamsiva at gmail.com> wrote:

> Hi all,
>
> I have to design web parser which will visit the given list of websites and
> need to fetch a particular set of details.
> It has to be so generic that even if we add new websites, it must fetch
> those details if available anywhere.
> So it must be something like a framework.
>
> Though i have done some parsers ,but they will parse for a given
> format(For. eg It will get the data from <title> tag).But here each website
> may have different format and the information may available within any tags.
>
> I know its a tough task for me,but i feel with python it should be
> possible.
> My request is, if such thing is already available please let me know ,also
> your suggestions are welcome.
>
> Note: I planned to use BeautifulSoup for parsing.
>
> --
> Yours,
> S.Selvam
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
I'd recommend mechanize in combination with BeautifulSoup - it greatly
simplifies most web-scraping tasks.
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From boblatest at googlemail.com  Mon May 18 04:36:51 2009
From: boblatest at googlemail.com (boblatest at googlemail.com)
Date: Mon, 18 May 2009 01:36:51 -0700 (PDT)
Subject: Prepackaged function args
Message-ID: <fbdbe1a9-2a20-4be4-a031-2ee367387224@x6g2000vbg.googlegroups.com>

Hello group,

suppose I've got a function f() that takes N parameters, and a list
(or tuple) arg[] with N elements that I'd like to pass as parameters.
The straightforward function call looks like this:

result = f(arg[0], arg[1], ..., arg[N-1])

Is there a less verbose way of accomlishing this?

Thanks,
robert


From eckhardt at satorlaser.com  Mon May 18 04:37:12 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 18 May 2009 10:37:12 +0200
Subject: os.path.split gets confused with combined \\ and /
References: <mailman.278.1242555066.8015.python-list@python.org>
Message-ID: <paj7e6-bb3.ln1@satorlaser.homedns.org>

Stef Mientki wrote:
> I've to distribute both python files and data files.
> Everything is developed under windows and now the datafiles contains
> paths with mixed \\ and /.

For your info: Some (!!!) parts of MS Windows understand forward slashes as
path separators and disallows them in file names, so you can often get away
with mixed paths. However, no POSIX system will understand a backslash as
path separator, which is a normal (though unusual) character in a file
name.

> Under windows everthing is working well,
> but under Ubuntu / Fedora sometimes strange errors occurs.
> Now I was thinking that using os.path.split would solve all problems,
> but if I've the following relative path
> 
>     path1/path2\\filename.dat
> 
> split will deliver the following under windows
>    path = path1 / path2
>    filename = filename.dat
> 
> while under Linux it will give me
>    path = path1
>    filename = path\\filename.dat
> 
> So I'm now planning to replace all occurences of os.path.split with a
> call to the following function
> 
> def path_split ( filename ) :
>     # under Ubuntu a filename with both
>     # forward and backward slashes seems to give trouble
>     # already in os.path.split
>     filename = filename.replace ( '\\','/')
> 
>     return os.path.split ( filename )
> 
> how do others solve this problem ?
> Are there better ways to solve this problem ?

Your data files must not contain OS-dependent paths. So, I would recommend
that you simply use forward slashes exclusively there, because those are
most common as path separators. Under POSIX systems like Ubuntu, you can
then use them 'as-is', while under win32 you would first convert them to
paths with backslashes (os.path.separator). Generalised, you could do
something like this:

  indep_path = string.split(line, data_path_separator)
  native_path = os.path.join(indep_path)

'data_path_separator' would then of course have to be the type of path
separator that is defined for your data format, per above I would suggest
slashes.

Uli


-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From paul at boddie.org.uk  Mon May 18 04:41:10 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Mon, 18 May 2009 01:41:10 -0700 (PDT)
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>

On 18 Mai, 08:54, Stefan Behnel <stefan... at behnel.de> wrote:
> Emanuele D'Arrigo wrote:
> > I'm looking at pxdom and in particular at its foundation class
> > DOMObject
>
> I didn't know pxdom, but looking at it now I can see that it hasn't been
> updated since 2006. Not sure if that means that it is complete or that it
> has been abandoned.

Maybe the developer is mostly satisfied with it.

> Anyway, seeing that it only provides DOM compliance, without anything
> further like XPath or whatever, and that it doesn't focus on performance in
> any way, you might still be better off with ElementTree, which is in the
> stdlib since Python 2.5 (and available for Py2.2+).

To put the inquirer's remarks in context, I suggested that he look at
pxdom specifically as a replacement for minidom and in response to the
following statement: "I've used etree and lxml successfully before but
I wanted to understand how close I can get to the W3C DOM standards."
Maybe you missed that thread, but here's a link to it:

http://groups.google.com/group/comp.lang.python/browse_frm/thread/d445363b99001ad6

Paul


From ben+python at benfinney.id.au  Mon May 18 04:44:35 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 18 May 2009 18:44:35 +1000
Subject: How to convert a list of strings to a tuple of floats?
References: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
Message-ID: <87vdny7qbw.fsf@benfinney.id.au>

"boblatest at googlemail.com" <boblatest at googlemail.com> writes:

> Hello group,
> 
> this is the conversion I'm looking for:
> 
> ['1.1', '2.2', '3.3'] -> (1.1, 2.2, 3.3)
> 
> Currently I'm "disassembling" the list by hand, like this:
> 
>     fields = line.split('; ')
>     for x in range(len(fields)):
>         fields[x] = float(fields[x])
>     ftuple = tuple(fields)
> 
> Of course it works, but it looks inelegant. Is there a more Pythonisch
> way of doing this?

You can create a tuple by calling the tuple type with an iterable, where
each item from the iterable becomes an element in the created tuple.

    >>> tuple([4, 5, 6])
    (4, 5, 6)

You can create an iterable with a generator expression:

    >>> for n in (x**2 for x in range(5)):
    ...     print n
    ... 
    0
    1
    4
    9
    16

Combine the two, creating a tuple from a generator expression:

    >>> fields = ['1.1', '2.2', '3.3']
    >>> record = tuple(
    ...     float(text) for text in fields)
    >>> record
    (1.1000000000000001, 2.2000000000000002, 3.2999999999999998)

-- 
 \        ?Nothing so needs reforming as other people's habits.? ?Mark |
  `\                                       Twain, _Pudd'n'head Wilson_ |
_o__)                                                                  |
Ben Finney


From clp2 at rebertia.com  Mon May 18 04:47:23 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 18 May 2009 01:47:23 -0700
Subject: Prepackaged function args
In-Reply-To: <fbdbe1a9-2a20-4be4-a031-2ee367387224@x6g2000vbg.googlegroups.com>
References: <fbdbe1a9-2a20-4be4-a031-2ee367387224@x6g2000vbg.googlegroups.com>
Message-ID: <50697b2c0905180147w605f6aaer79cd1df769edb928@mail.gmail.com>

On Mon, May 18, 2009 at 1:36 AM, boblatest at googlemail.com
<boblatest at googlemail.com> wrote:
> Hello group,
>
> suppose I've got a function f() that takes N parameters, and a list
> (or tuple) arg[] with N elements that I'd like to pass as parameters.
> The straightforward function call looks like this:
>
> result = f(arg[0], arg[1], ..., arg[N-1])

result = f(*arg)

Cheers,
Chris
-- 
http://blog.rebertia.com


From mail at johnohagan.com  Mon May 18 05:00:15 2009
From: mail at johnohagan.com (John O'Hagan)
Date: Mon, 18 May 2009 09:00:15 +0000
Subject: Prepackaged function args
In-Reply-To: <fbdbe1a9-2a20-4be4-a031-2ee367387224@x6g2000vbg.googlegroups.com>
References: <fbdbe1a9-2a20-4be4-a031-2ee367387224@x6g2000vbg.googlegroups.com>
Message-ID: <200905180900.15430.mail@johnohagan.com>

On Mon, 18 May 2009, boblatest at googlemail.com wrote:
> Hello group,
>
> suppose I've got a function f() that takes N parameters, and a list
> (or tuple) arg[] with N elements that I'd like to pass as parameters.
> The straightforward function call looks like this:
>
> result = f(arg[0], arg[1], ..., arg[N-1])
>
> Is there a less verbose way of accomlishing this?
[...]

result = f(*arg)

Regards,

John



From bluefisher80 at gmail.com  Mon May 18 05:18:52 2009
From: bluefisher80 at gmail.com (Jim Qiu)
Date: Mon, 18 May 2009 17:18:52 +0800
Subject: A newbie question about some code
Message-ID: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>

Hi everyone.
I am reading a python library code and found something i can not understand.
Please help!

class Envelope(object):

    def __init__(self,ta_info):
        self.ta_info = ta_info


    def writefilelist(self,ta_list,tofile):
        for filename in ta_list:
            fromfile = botslib.botsopendata(filename,
'rb',self.ta_info['charset'])
            shutil.copyfileobj(fromfile,tofile)
            fromfile.close()

    def convertfilelist(self,ta_list):
        return [botslib.botsgetabspathdata(filename) for filename in
ta_list]



class myxmlenvelop(Envelope):
    def __init__(self,ta_info,ta_list):
        ''' class for (test) xml envelope. There is no standardised
XML-envelope!
            writes a new XML-tree; uses places-holders for XML-files to
include; real enveloping is done by ElementTree's include'''
        self.ta_info = ta_info
        self._openoutenvelope()
        #~ self.out.put({'BOTSID':'root','xmlns:xi':"
http://www.w3.org/2001/XInclude"})     #works, but attribute is not removed
bij ETI.include
        self.out.put({'BOTSID':'root'})
        ta_list = self.convertfilelist(ta_list)
        for filename in ta_list:
            self.out.put({'BOTSID':'root'},{'BOTSID':'{
http://www.w3.org/2001/XInclude}include','parse':"xml",'href':filename})
        self.out.envelopewrite(self.out.root


Please check the blue highlighted part,  I don't understand how the object
get the property?


Jim
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From jeremy at martinfamily.freeserve.co.uk  Mon May 18 05:27:06 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Mon, 18 May 2009 02:27:06 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
Message-ID: <477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>

On 17 May, 22:27, Paul Boddie <p... at boddie.org.uk> wrote:
> On 17 Mai, 14:05, jer... at martinfamily.freeserve.co.uk wrote:
>
> > From a user point of view I think that adding a 'par' construct to
> > Python for parallel loops would add a lot of power and simplicity,
> > e.g.
>
> > par i in list:
> > ? ? updatePartition(i)
>
> You can do this right now with a small amount of work to make
> updatePartition a callable which works in parallel, and without the
> need for extra syntax. For example, with the pprocess module, you'd
> use boilerplate like this:
>
> ? import pprocess
> ? queue = pprocess.Queue(limit=ncores)
> ? updatePartition = queue.manage(pprocess.MakeParallel
> (updatePartition))
>
> (Seehttp://www.boddie.org.uk/python/pprocess/tutorial.html#Mapfor
> details.)
>
> At this point, you could use a normal "for" loop, and you could then
> "sync" for results by reading from the queue. I'm sure it's a similar
> story with the multiprocessing/processing module.
>
> > There would be no locking and it would be the programmer's
> > responsibility to ensure that the loop was truly parallel and correct.
>
> Yes, that's the idea.
>
> > The intention of this would be to speed up Python execution on multi-
> > core platforms. Within a few years we will see 100+ core processors as
> > standard and we need to be ready for that.
>
> In what sense are we not ready? Perhaps the abstractions could be
> better, but it's definitely possible to run Python code on multiple
> cores today and get decent core utilisation.
>
> > There could also be parallel versions of map, filter and reduce
> > provided.
>
> Yes, that's what pprocess.pmap is for, and I imagine that other
> solutions offer similar facilities.
>
> > BUT...none of this would be possible with the current implementation
> > of Python with its Global Interpreter Lock, which effectively rules
> > out true parallel processing.
>
> > See:http://jessenoller.com/2009/02/01/python-threads-and-the-global-inter...
>
> > What do others think?
>
> That your last statement is false: true parallel processing is
> possible today. See the Wiki for a list of solutions:
>
> http://wiki.python.org/moin/ParallelProcessing
>
> In addition, Jython and IronPython don't have a global interpreter
> lock, so you have the option of using threads with those
> implementations, too.
>
> Paul

Hi Paul and others,

Thanks for your responses to my original questions.

Paul, thanks for explaining about the pprocess module which appears
very useful. I presume that this is using multiple operating system
processes rather than threads which would probably imply that it is
suitable for coarse grained parallel programming rather than fine-
grained because of overhead in starting up new processes and sharing
objects. (How is that done, by the way?). It probably has advantages
and disadvantages compared with thread based parallelism.

My suggestion is primarily about using multiple threads and sharing
memory - something akin to the OpenMP directives that one of you has
mentioned. To do this efficiently would involve removing the Global
Interpreter Lock, or switching to Jython or Iron Python as you
mentioned.

However I *do* actually want to add syntax to the language. I think
that 'par' makes sense as an official Python construct - we already
have had this in the Occam programming language for twenty-five years.
The reason for this is ease of use. I would like to make it easy for
amateur programmers to exploit natural parallelism in their
algorithms. For instance somebody who wishes to calculate a property
of each member from a list of chemical structures using the Python
Daylight interface: with my suggestion they could potentially get a
massive speed up just by changing 'for' to 'par' or 'map' to 'pmap'.
(Or map with a parallel keyword argument set as suggested). At present
they would have to manually chop up their work and run it as multiple
processes in order to achieve the same - fine for expert programmers
but not reasonable for people working in other domains who wish to use
Python as a utility because of its fantastic productivity and ease of
use.

Let me clarify what I think par, pmap, pfilter and preduce would mean
and how they would be implemented. A par loop is like a for loop,
however the programmer is saying that the order in which the
iterations are performed doesn't matter and they might be performed in
parallel. The python system then has the option to allocate a number
of threads to the task and share out the iterations accordingly
between the threads. (It might be that the programmer should be
allowed to explictly define the number of threads to use or can
delegate that decision to the system). Parallel pmap and pfilter would
be implemented in much the same way, although the resultant list might
have to be reassembled from the partial results returned from each
thread. As people have pointed out, parallel reduce is a tricky option
because it requires the binary operation to be associative in which
case it can be parallelised by calculating the result using a tree-
based evaluation strategy.

I have used all of OpenMP, MPI, and Occam in the past. OpenMP adds
parallelism to programs by the use of special comment strings, MPI by
explicit calls to library routines, and Occam by explicit syntactical
structures. Each has its advantages. I like the simplicity of OpenMP,
the cross-language portability of MPI and the fact the concurrency is
built in to the Occam language. What I am proposing here is a hybrid
of the OpenMP and Occam approaches - a change to the language which is
very natural and yet is easy for programmers to understand.
Concurrency is generally regarded as the hardest concept for
programmers to grasp.

Jeremy


From rhodri at wildebst.demon.co.uk  Mon May 18 05:30:15 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 18 May 2009 10:30:15 +0100
Subject: A newbie question about some code
In-Reply-To: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
References: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
Message-ID: <op.ut4cops9a8ncjz@gnudebst>

On Mon, 18 May 2009 10:18:52 +0100, Jim Qiu <bluefisher80 at gmail.com> wrote:

> Please check the blue highlighted part,  I don't understand how the  
> object
> get the property?

Colours and highlighting don't come across in Usenet postings.  Could
you be a bit more specific.  Which object, and what property?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From clp2 at rebertia.com  Mon May 18 05:31:35 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 18 May 2009 02:31:35 -0700
Subject: A newbie question about some code
In-Reply-To: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
References: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
Message-ID: <50697b2c0905180231q4be49ff7jb6ead12109747d43@mail.gmail.com>

On Mon, May 18, 2009 at 2:18 AM, Jim Qiu <bluefisher80 at gmail.com> wrote:
> Hi everyone.
> I am reading a python library code and found something i can not understand.
> Please help!
> class Envelope(object):
> ?? ?def __init__(self,ta_info):
> ?? ? ? ?self.ta_info = ta_info
>
> ?? ?def writefilelist(self,ta_list,tofile):
> ?? ? ? ?for filename in ta_list:
> ?? ? ? ? ? ?fromfile = botslib.botsopendata(filename,
> 'rb',self.ta_info['charset'])
> ?? ? ? ? ? ?shutil.copyfileobj(fromfile,tofile)
> ?? ? ? ? ? ?fromfile.close()
> ?? ?def convertfilelist(self,ta_list):
> ?? ? ? ?return [botslib.botsgetabspathdata(filename) for filename in
> ta_list]
>
>
> class myxmlenvelop(Envelope):
> ?? ?def __init__(self,ta_info,ta_list):
> ?? ? ? ?''' class for (test) xml envelope. There is no standardised
> XML-envelope!
> ?? ? ? ? ? ?writes a new XML-tree; uses places-holders for XML-files to
> include; real enveloping is done by ElementTree's include'''
> ?? ? ? ?self.ta_info = ta_info
> ?? ? ? ?self._openoutenvelope()
> ?? ? ? ?#~
> self.out.put({'BOTSID':'root','xmlns:xi':"http://www.w3.org/2001/XInclude"})
> ? ? #works, but attribute is not removed bij ETI.include
> ?? ? ? ?self.out.put({'BOTSID':'root'})
> ?? ? ? ?ta_list = self.convertfilelist(ta_list)
> ?? ? ? ?for filename in ta_list:
>
> ?self.out.put({'BOTSID':'root'},{'BOTSID':'{http://www.w3.org/2001/XInclude}include','parse':"xml",'href':filename})
> ?? ? ? ?self.out.envelopewrite(self.out.root
>
> Please check the blue highlighted part, ?I don't understand how the object
> get the property?

I would guess the `out` attribute is created in _openoutenvelope(),
but you didn't include all the code, so it's impossible to be sure.

Also, I'd recommend keeping your posts in plaintext in the future
rather than relying on HTML formatting.

Cheers,
Chris
-- 
http://blog.rebertia.com


From phihag at phihag.de  Mon May 18 05:49:15 2009
From: phihag at phihag.de (Philipp Hagemeister)
Date: Mon, 18 May 2009 11:49:15 +0200
Subject: .pth in current directory: Why doesn't it work as the documentation
	says?
Message-ID: <4A112F1B.8010109@phihag.de>

Where is the fault in my reasoning here?

1) According to http://docs.python.org/dev/install/, "The most
convenient way is to add a path configuration file to a directory that?s
already on Python?s path, (...).

2) Path configuration files have an extension of .pth, (...)"

1&2 => 3) A file test.pth with the content "/example/" should result in
sys.path containing "/example/".

4) "" (the current directory) is the first element of my sys.path

1&4 => 5) The current directory qualifies for "a directory that?s
already on Python?s path,"

1&3&5 => 6) echo /example/ > test.pth; python -c 'import
sys;print(repr(sys.path))' should contain '/example'.


I think I misinterpreted the documentation, but what exactly is wrong here?

Regards,

Philipp

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From deets at nospam.web.de  Mon May 18 06:08:26 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 18 May 2009 12:08:26 +0200
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de>
	<02204669$0$25303$c3e8da3@news.astraweb.com>
	<77b3koF1go3t7U1@mid.uni-berlin.de>
	<02209010$0$25303$c3e8da3@news.astraweb.com>
Message-ID: <77cq8sF1h6po8U1@mid.uni-berlin.de>

Steven D'Aprano wrote:

> On Sun, 17 May 2009 20:34:00 +0200, Diez B. Roggisch wrote:
> 
>>>> My math-skills are a bit too rusty to qualify the exact nature of the
>>>> operation, commutativity springs to my mind.
>>> 
>>> And how is reduce() supposed to know whether or not some arbitrary
>>> function is commutative?
>> 
>> I don't recall anybody saying it should know that - do you? The OP wants
>> to introduce parallel variants, not replace the existing ones.
> 
> Did I really need to spell it out? From context, I'm talking about the
> *parallel version* of reduce().

>From what context - your permanent arguing that there is no way for reduce
to determine if the passed operation is associative (which no one claimed
to be possible, nor to be needed)? No, from *that* context it wasn't clear.

It's the programmer who decides which version to use.

Diez


From david.lyon at preisshare.net  Mon May 18 06:46:54 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Mon, 18 May 2009 06:46:54 -0400
Subject: .pth in current directory: Why doesn't it work as the
	documentation =?UTF-8?Q?says=3F?=
In-Reply-To: <4A112F1B.8010109@phihag.de>
References: <4A112F1B.8010109@phihag.de>
Message-ID: <884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>

On Mon, 18 May 2009 11:49:15 +0200, Philipp Hagemeister <phihag at phihag.de>
wrote:
> 1) According to http://docs.python.org/dev/install/, "The most
> convenient way is to add a path configuration file to a directory
that?s
> already on Python?s path, (...).

It's true...

> 2) Path configuration files have an extension of .pth, (...)"

Yes.

> 1&2 => 3) A file test.pth with the content "/example/" should result in
> sys.path containing "/example/".

No. Python, once finding the .pth will process it. 

> 
> 4) "" (the current directory) is the first element of my sys.path

Not always - but maybe it is. Let's not assume anything.

> 
> 1&4 => 5) The current directory qualifies for "a directory that?s
> already on Python?s path,"


> 
> 1&3&5 => 6) echo /example/ > test.pth; python -c 'import
> sys;print(repr(sys.path))' should contain '/example'.
> 
> 
> I think I misinterpreted the documentation, but what exactly is wrong
here?

What are you expecting? and maybe we can tell you why you aren't getting
it...

David


From lists at cheimes.de  Mon May 18 06:57:34 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 18 May 2009 12:57:34 +0200
Subject: .pth in current directory: Why doesn't it work as the
	documentation says?
In-Reply-To: <4A112F1B.8010109@phihag.de>
References: <4A112F1B.8010109@phihag.de>
Message-ID: <gureuu$nlj$1@ger.gmane.org>

Philipp Hagemeister schrieb:
> Where is the fault in my reasoning here?

Python processes .pth files only in some directories. The directories are

 * the global site-packages directory
 * the user site-packages directory (starting with Python 2.6)
 * and any directory that is added by a .pth file

The feature is implemented and documented in the site.py file.

Christian



From kalyanchakravarthy at hyit.com  Mon May 18 07:01:28 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Mon, 18 May 2009 16:31:28 +0530
Subject: How can i use Spread Sheet as Data Store
Message-ID: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>

Hi All,
             I have data in Spread Sheet ( First Name and Last Name), how
can i see  this data  in Python code ( how can i use Spread Sheet as Data
Store ) .

-- 
Regards
Kalyan
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From hackingkk at gmail.com  Mon May 18 07:08:17 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Mon, 18 May 2009 16:38:17 +0530
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
Message-ID: <1242644897.5644.1.camel@kk-laptop>

Hi Kaliyan,
It is very simple.
There is a library called odfpy which you can use to read and write odf
documents.  I highly recommend using open formats so that the API is
clear and you can ask help if needed.
The odfpy library has modules to create spreadsheets and read or write
by row or sell etc.

happy hacking.
Krishnakant.
 
On Mon, 2009-05-18 at 16:31 +0530, Kalyan Chakravarthy wrote:
> Hi All,
>              I have data in Spread Sheet ( First Name and Last Name),
> how can i see  this data  in Python code ( how can i use Spread Sheet
> as Data Store ) . 
> 
> -- 
> Regards
> Kalyan
> 



From fuzzyman at voidspace.org.uk  Mon May 18 07:17:37 2009
From: fuzzyman at voidspace.org.uk (Michael Foord)
Date: Mon, 18 May 2009 12:17:37 +0100
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A10F999.5050106@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>	<4A108ABF.9060909@v.loewis.de>	<ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>	<1A472770E042064698CB5ADC83A12ACD016E82D6@TK5EX14MBXC116.redmond.corp.microsoft.com>
	<4A1097F5.2050009@v.loewis.de> <4A10A368.1060406@voidspace.org.uk>
	<4A10F999.5050106@v.loewis.de>
Message-ID: <4A1143D1.1050806@voidspace.org.uk>

Martin v. L?wis wrote:
>>>> It also might make it easier for alternate implementations to support
>>>> the same API so some modules could work cross implementation - but I
>>>> suspect that's a non-goal of this PEP :).
>>>>     
>>>>         
>>> Indeed :-) I'm also skeptical that this would actually allow
>>> cross-implementation modules to happen. The list of functions that
>>> an alternate implementation would have to provide is fairly long.
>>>
>>>   
>>>       
>> Just in case you're unaware of it; the company I work for has an open
>> source project called Ironclad.
>>     
>
> I was unaware indeed; thanks for pointing this out.
>
> IIUC, it's not just an API emulation, but also an ABI emulation.
>
>   

Correct.

>> In particular we have had to address the issue of the GIL and extensions
>> (IronPython has no GIL) and reference counting (which IronPython also
>> doesn't) use.
>>     
>
> I think this somewhat strengthens the point I was trying to make: An
> alternate implementation that tries to be API compatible has to consider
> so many things that it is questionable whether making Py_INCREF/DECREF
> functions would be any simplification.
>   

It would actually have been helpful for us, but I understand that it 
would be a big performance hit. The Ironclad garbage collection 
mechanism is described here:

http://www.voidspace.org.uk/python/weblog/arch_d7_2009_01_24.shtml#e1055

We artificially inflate the refcount of all objects that Ironclad 
creates to 2 and hold a reference to them on the .NET side to make them 
ineligible for garbage collection.

Because we can't always know when objects have been decreffed back down 
to 1, there are some circumstances when we have to scan all the objects 
we are holding onto. If their refcount is only 1 then we no longer need 
to hold a reference them. When nothing is using them on the IronPython 
side either normal .NET garbage collection kicks in and the IronPython 
proxy object has a destructor that calls back into Ironclad and uses the 
CPython dealloc method.

> So I just ask:
> a) Would it help IronClad if it could restrict itself to PEP 384
>    compatible modules?
> b) Would further restrictions in the PEP help that cause?
>   

I've forwarded these questions to the lead developer of Ironclad 
(William Reade) along with a link to the PEP. He isn't on Python-dev so 
I may have to be a proxy for him in discussion. His initial response was 
"looks pretty sweet".

Michael

> Regards,
> Martin
>   


-- 
http://www.ironpythoninaction.com/
http://www.voidspace.org.uk/blog




From bieffe62 at gmail.com  Mon May 18 08:10:24 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Mon, 18 May 2009 05:10:24 -0700 (PDT)
Subject: Python mail truncate problem
References: <4db625fe-158d-4b04-af0b-23e54c3ae22b@e23g2000vbe.googlegroups.com>
Message-ID: <f14601f3-d8c6-4a6f-af10-7367e35311f8@q14g2000vbn.googlegroups.com>

On 18 Mag, 05:51, David <Ww... at yahoo.com> wrote:
> Hi,
>
> I am writing Python script to process e-mails in a user's mail
> account. What I want to do is to update that e-mail's Status to 'R'
> after processing it, however, the following script truncates old e-
> mails even though it updates that e-mail's Status correctly. Anybody
> knows how to fix this?
>
> Thanks so much.
>
> ? fp = '/var/spool/mail/' + user
> ? ? ? ? ? ? ? ? mbox = mailbox.mbox(fp)
>
> ? ? ? ? ? ? ? ? for key, msg in mbox.iteritems():
> ? ? ? ? ? ? ? ? ? ? ? ? flags = msg.get_flags()
>
> ? ? ? ? ? ? ? ? ? ? ? ? if 'R' not in flags:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? # now process the e-mail
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? # now update status
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? msg.add_flag('R' + flags)
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mbox[key] = msg


I have no idea about your problem. However, I believe that  the last
statement
"mbox[key] = msg" is not needed. The objects returned by
dict.iteritems are not copies but
the actual ones in the dictionary, so your msg.add_flag() already
modifies the object in mbox.

HTH

Ciao
-----
FB


From phihag at phihag.de  Mon May 18 08:34:33 2009
From: phihag at phihag.de (Philipp Hagemeister)
Date: Mon, 18 May 2009 14:34:33 +0200
Subject: .pth in current directory: Why doesn't it work as the
	documentation says?
In-Reply-To: <884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>
References: <4A112F1B.8010109@phihag.de>
	<884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>
Message-ID: <4A1155D9.6090403@phihag.de>

David Lyon wrote:
> (...)
>> 1&2 => 3) A file test.pth with the content "/example/" should result in
>> sys.path containing "/example/".
> 
> No. Python, once finding the .pth will process it. 

Yes, but that processing will add /example/ to sys.path, right?

>> 4) "" (the current directory) is the first element of my sys.path
> 
> Not always - but maybe it is. Let's not assume anything.

Of *my* sys.path. And by default, I think it is.

> (...)
>> I think I misinterpreted the documentation, but what exactly is wrong
> here?
> 
> What are you expecting? and maybe we can tell you why you aren't getting
> it...
> 
> David

I'm expecting .pth files in the current directory to be be processed,
according to docs/install/. Christian Heimes already pointed out this is
not the case; so I'm wondering whether this is a mistake in the
documentation or just my faulty logic.

Cheers,

Philipp

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From steve.ferg.bitbucket at gmail.com  Mon May 18 08:39:03 2009
From: steve.ferg.bitbucket at gmail.com (Steve Ferg)
Date: Mon, 18 May 2009 05:39:03 -0700 (PDT)
Subject: Seeking old post on developers who like IDEs vs developers who 
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
Message-ID: <9841242d-dc75-408a-8498-db856c64f65a@n8g2000vbb.googlegroups.com>

Thanks.  Your observations would make good comments on the original
blog message that I'm seeking.  Do you have a link to that blog?


From david.lyon at preisshare.net  Mon May 18 08:51:03 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Mon, 18 May 2009 08:51:03 -0400
Subject: .pth in current directory: Why doesn't it work as the
	documentation =?UTF-8?Q?says=3F?=
In-Reply-To: <4A1155D9.6090403@phihag.de>
References: <4A112F1B.8010109@phihag.de>
	<884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>
	<4A1155D9.6090403@phihag.de>
Message-ID: <c09eb35beddfb5e7f3eb73282717615b@preisshare.net>

On Mon, 18 May 2009 14:34:33 +0200, Philipp Hagemeister <phihag at phihag.de>
wrote:
> Yes, but that processing will add /example/ to sys.path, right?

It actually works the other way around. The directories listed in
sys.path are scanned for .pth files.

You can add packages by listing them inside a .PTH.

> I'm expecting .pth files in the current directory to be be processed,
> according to docs/install/. Christian Heimes already pointed out this is
> not the case; so I'm wondering whether this is a mistake in the
> documentation or just my faulty logic.

Perphaps you don't understand them yet.

.PTH files are for adding run-time packages.

May I ask why you are playing with .PTH files? they are a fairly
advanced sort of concept for describing where packages are located
to the python interpreter.

If you are using .PTH files... you should be using "import .." 
inside your code..

Regards

David


From aahz at pythoncraft.com  Mon May 18 08:56:11 2009
From: aahz at pythoncraft.com (Aahz)
Date: 18 May 2009 05:56:11 -0700
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
Message-ID: <gurltb$ar8$1@panix3.panix.com>

In article <mff7e6-e43.ln1 at satorlaser.homedns.org>,
Ulrich Eckhardt  <eckhardt at satorlaser.com> wrote:
>Steve Ferg wrote:
>>
>> On the one hand, there are developers who love big IDEs with lots of
>> features (code generation, error checking, etc.), and rely on them to
>> provide the high level of support needed to be reasonably productive
>> in heavy-weight languages (e.g. Java).
>> 
>> On the other hand there are developers who much prefer to keep things
>> light-weight and simple.  They like clean high-level languages (e.g.
>> Python) which are compact enough that you can keep the whole language
>> in your head, and require only a good text editor to be used
>> effectively.
>
>This distinction is IMHO not correct. If you took a look at Java, you would
>notice that the core language syntax is much simpler than Python's. 

That's half-true.  The problem is that you have to digest a much bigger
chunk of Java before you can start being productive.  Consider how simple
it is to write a non-regex grep in Python.  In addition, Python's object
model is simpler than Java's, not even talking about the contortions that
Java's static class model forces you into.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From marco at sferacarta.com  Mon May 18 08:59:46 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Mon, 18 May 2009 14:59:46 +0200
Subject: Seeking old post on developers who like IDEs vs developers who
	like  simple languages
In-Reply-To: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
Message-ID: <6ZcQl.18366$Ux.8657@tornado.fastwebnet.it>

Steve Ferg wrote:

> I periodically think of that blog, usually in circumstances that make
> me also think "Boy, that guy really got it right".  But despite
> repeated and prolonged bouts of googling I haven't been able to find
> the article again.  I must be using the wrong search terms or
> something.
> 
> Does anybody have a link to this article?

I think you mean this clbuttic post:

http://osteele.com/archives/2004/11/ides




From mail at timgolden.me.uk  Mon May 18 09:05:50 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 18 May 2009 14:05:50 +0100
Subject: .pth in current directory: Why doesn't it work as the
	documentation says?
In-Reply-To: <c09eb35beddfb5e7f3eb73282717615b@preisshare.net>
References: <4A112F1B.8010109@phihag.de>	<884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>	<4A1155D9.6090403@phihag.de>
	<c09eb35beddfb5e7f3eb73282717615b@preisshare.net>
Message-ID: <4A115D2E.8070905@timgolden.me.uk>

David Lyon wrote:
> On Mon, 18 May 2009 14:34:33 +0200, Philipp Hagemeister <phihag at phihag.de>
> wrote:
>> Yes, but that processing will add /example/ to sys.path, right?
> 
> It actually works the other way around. The directories listed in
> sys.path are scanned for .pth files.
> 
> You can add packages by listing them inside a .PTH.
> 
>> I'm expecting .pth files in the current directory to be be processed,
>> according to docs/install/. Christian Heimes already pointed out this is
>> not the case; so I'm wondering whether this is a mistake in the
>> documentation or just my faulty logic.
> 
> Perphaps you don't understand them yet.
> 
> .PTH files are for adding run-time packages.
> 
> May I ask why you are playing with .PTH files? they are a fairly
> advanced sort of concept for describing where packages are located
> to the python interpreter.
> 
> If you are using .PTH files... you should be using "import .." 
> inside your code..


David: I believe you're at least over-stating the case for .pth
files as "fairly advanced" and "for adding run-time packages".

According to http://docs.python.org/install/index.html and my
own reasonably long experience of them, they're just a way of
getting extra paths into sys.path. Those paths could, of course,
support adding packages, but they might not. My own has a mixture
of network directories which contain a bunch of commonly-used
modules, and entries in my subversion checkouts dir each of which
may or may not refer to a package.

The docs referred to above do indeed say "add a path configuration 
file to a directory that?s already on Python?s path" but until I
saw Christian H's post just now, I'd never bothered to understand
exactly what the mechanism was: I just stick site.pth into c:\pythonxx
and it works for me.

TJG



From thomas.vogel at likeabird.de  Mon May 18 09:19:01 2009
From: thomas.vogel at likeabird.de (thomas.vogel at likeabird.de)
Date: Mon, 18 May 2009 06:19:01 -0700 (PDT)
Subject: UDP reading on multiple sockets
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net> 
	<15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>
Message-ID: <27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>

On 17 Mai, 04:22, Grant Edwards <gra... at visi.com> wrote:
> On 2009-05-17, Thomas Vogel <thomas.vo... at likeabird.de> wrote:
>
> > I'm currently have the problem that I try to read UDP messages from
> > multiple sockets in parallel. So let's say I get UDP packets from the
> > same IP on the ports 2000, 2001, 2002,...
>
> Is there any reason you can't do it the easy way by using
> select?
>
> http://docs.python.org/library/select.html
>
> --
> Grant

The only honest answer would be that I'm totaly unfamiliar with select
and also the documentation I found wasn't able to clear the picture.
So are there examples of using select together with sockets available?

Kind regards
Thomas


From mk.fraggod at gmail.com  Mon May 18 09:29:18 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Mon, 18 May 2009 19:29:18 +0600
Subject: How to convert a list of strings to a tuple of floats?
In-Reply-To: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
References: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
Message-ID: <20090518192918.7b6f56db@coercion>

On Mon, 18 May 2009 00:51:43 -0700 (PDT)
"boblatest at googlemail.com" <boblatest at googlemail.com> wrote:

> this is the conversion I'm looking for:
> 
> ['1.1', '2.2', '3.3'] -> (1.1, 2.2, 3.3)

Since itertools are useful in nearly every module and probably are
imported already...

  import itertools as it
  ftuple = tuple(it.imap( float, line.split('; ') ))

-- 
Mike Kazantsev // fraggod.net
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From phihag at phihag.de  Mon May 18 09:40:11 2009
From: phihag at phihag.de (Philipp Hagemeister)
Date: Mon, 18 May 2009 15:40:11 +0200
Subject: .pth in current directory: Why doesn't it work as the
	documentation says?
In-Reply-To: <c09eb35beddfb5e7f3eb73282717615b@preisshare.net>
References: <4A112F1B.8010109@phihag.de>
	<884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>
	<4A1155D9.6090403@phihag.de>
	<c09eb35beddfb5e7f3eb73282717615b@preisshare.net>
Message-ID: <4A11653B.4020300@phihag.de>

David Lyon wrote:
> On Mon, 18 May 2009 14:34:33 +0200, Philipp Hagemeister <phihag at phihag.de>
> wrote:
>> Yes, but that processing will add /example/ to sys.path, right?
> 
> It actually works the other way around. The directories listed in
> sys.path are scanned for .pth files.

No, they are not. That's exactly my point. According to Christian
Heimes, *some* of the directories listed in sys.path are scanned. "" is
in sys.path, but is not scanned.

> You can add packages by listing them inside a .PTH.
> 
>> I'm expecting .pth files in the current directory to be be processed,
>> according to docs/install/. Christian Heimes already pointed out this is
>> not the case; so I'm wondering whether this is a mistake in the
>> documentation or just my faulty logic.
> 
> Perphaps you don't understand them yet.
> 
> .PTH files are for adding run-time packages.
> 
> May I ask why you are playing with .PTH files? they are a fairly
> advanced sort of concept for describing where packages are located
> to the python interpreter.
> 
> If you are using .PTH files... you should be using "import .." 
> inside your code..

I know that, and I want to use them for an application consisting of
multiple scripts, like so:

/
 mylib/
 somescripts/
   script1.py
   script2.py
   mylib.pth (contains '../mylib/')
 otherscripts/
   oscript1.py
   oscript2.py
   mylib.pth (contains '../mylib/')

If you want, you can change the final point in my original post to:

1&3&5 => 6) echo /example/ > test.pth;touch /example/libfoo.py; python
-c 'import libfoo'

Cheers,

Philipp

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From david.lyon at preisshare.net  Mon May 18 09:40:31 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Mon, 18 May 2009 09:40:31 -0400
Subject: .pth in current directory: Why doesn't it work as the
	documentation =?UTF-8?Q?says=3F?=
In-Reply-To: <4A115D2E.8070905@timgolden.me.uk>
References: <4A112F1B.8010109@phihag.de>	<884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>	<4A1155D9.6090403@phihag.de>
	<c09eb35beddfb5e7f3eb73282717615b@preisshare.net>
	<4A115D2E.8070905@timgolden.me.uk>
Message-ID: <077569c046be9591d9fe7f738d64a312@preisshare.net>

On Mon, 18 May 2009 14:05:50 +0100, Tim Golden <mail at timgolden.me.uk>
wrote:

> According to http://docs.python.org/install/index.html and my
> own reasonably long experience of them, they're just a way of
> getting extra paths into sys.path. ....

Well, fair enough... 

> The docs referred to above do indeed say "add a path configuration 
> file to a directory that?s already on Python?s path" but until I
> saw Christian H's post just now, I'd never bothered to understand
> exactly what the mechanism was: I just stick site.pth into c:\pythonxx
> and it works for me.

Sure. Only I have been debugging the code lately to try to understand
how to do package installation/deinstallation for a python package 
manager. Perphaps my understunding is simplistic.

I think the area of confusion here is the word "directory". I suggest
that perphaps the term "package" is more modern.

For example, "a .PTH file in a sys.path directory contains links to all 
the packages available to python" is perphaps is clearer than :

"a .PTH file in a sys.path directory contains links to all the 
directories available to python"

Everybody knows your experience goes back a lot further than mine.

So you're probably in a much better position to explain it than me.

Good - I can go back to my code now...

:-)

David






From s.selvamsiva at gmail.com  Mon May 18 09:43:31 2009
From: s.selvamsiva at gmail.com (S.Selvam)
Date: Mon, 18 May 2009 19:13:31 +0530
Subject: Generic web parser
In-Reply-To: <12cbbbfc0905180129m13d3f89bt588be8c08d96be35@mail.gmail.com>
References: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
	<12cbbbfc0905180129m13d3f89bt588be8c08d96be35@mail.gmail.com>
Message-ID: <b423b9550905180643w4dc9dae7na5d1fac067005065@mail.gmail.com>

On Mon, May 18, 2009 at 1:59 PM, Jeremiah Dodds <jeremiah.dodds at gmail.com>wrote:

>
>
> On Sat, May 16, 2009 at 2:18 PM, S.Selvam <s.selvamsiva at gmail.com> wrote:
>
>> Hi all,
>>
>> I have to design web parser which will visit the given list of websites
>> and need to fetch a particular set of details.
>> It has to be so generic that even if we add new websites, it must fetch
>> those details if available anywhere.
>> So it must be something like a framework.
>>
>> Though i have done some parsers ,but they will parse for a given
>> format(For. eg It will get the data from <title> tag).But here each website
>> may have different format and the information may available within any tags.
>>
>> I know its a tough task for me,but i feel with python it should be
>> possible.
>> My request is, if such thing is already available please let me know ,also
>> your suggestions are welcome.
>>
>> Note: I planned to use BeautifulSoup for parsing.
>>
>> --
>> Yours,
>> S.Selvam
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
> I'd recommend mechanize in combination with BeautifulSoup - it greatly
> simplifies most web-scraping tasks.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>

Thank you all for your response,

I have started to develop my design based on BeautifulSoup,i planned to
write separate module for each information which i would like to extract
from the website and through the url at it.It has to extract the required
information if available.

Each module tries with pattern matching and returns the result.

I planned to write it in a generic way.I welcome your suggestions.
-- 
Yours,
S.Selvam
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From pfein at pobox.com  Mon May 18 11:11:05 2009
From: pfein at pobox.com (Pete)
Date: Mon, 18 May 2009 10:11:05 -0500
Subject: Concurrency Email List
In-Reply-To: <20090517002621.GA18009@panix.com>
References: <2F8C1929-B58D-4845-A237-EFAEE8BF753D@pobox.com>
	<20090517002621.GA18009@panix.com>
Message-ID: <77516220-6589-4592-9673-9FDC1FE74D31@pobox.com>

On May 16, 2009, at 7:26 PM, Aahz wrote:

> [posted and e-mailed]
>
> On Sat, May 16, 2009, Pete wrote:
>>
>> python-concurrency at googlegroups.com is a new email list for  
>> discussion
>> of concurrency issues in python.  It arose out of Dave Beazley's  
>> class
>> on the subject last week: http://www.dabeaz.com/chicago/concurrent.html
>>
>> The list wills serve as a forum for discussion of such topics as:
>>
>> * threads
>> * multiprocessing
>> * asynchronous
>> * coroutines
>> * the GIL
>>
>> Hope to see you there!  Join at http://groups.google.com/group/python-concurrency/
>
> Is there some reason you chose not to create a list on python.org?   
> I'm
> not joining the list because Google requires that you create a login.

Because it took less time to create the group on Google than it took  
for me to even find the instructions for doing so on python.org (still  
looking).  That said, I'm happy to move if someone would like to point  
me in the right direction/facilitate.


From Wwy58 at yahoo.com  Mon May 18 11:13:58 2009
From: Wwy58 at yahoo.com (David)
Date: Mon, 18 May 2009 08:13:58 -0700 (PDT)
Subject: Python mail truncate problem
References: <4db625fe-158d-4b04-af0b-23e54c3ae22b@e23g2000vbe.googlegroups.com>
	<f14601f3-d8c6-4a6f-af10-7367e35311f8@q14g2000vbn.googlegroups.com>
Message-ID: <38e62c2d-adab-453a-9d57-2438371036a0@s38g2000prg.googlegroups.com>

On May 18, 5:10?am, bieff... at gmail.com wrote:
> On 18 Mag, 05:51, David <Ww... at yahoo.com> wrote:
>
>
>
>
>
> > Hi,
>
> > I am writing Python script to process e-mails in a user's mail
> > account. What I want to do is to update that e-mail's Status to 'R'
> > after processing it, however, the following script truncates old e-
> > mails even though it updates that e-mail's Status correctly. Anybody
> > knows how to fix this?
>
> > Thanks so much.
>
> > ? fp = '/var/spool/mail/' + user
> > ? ? ? ? ? ? ? ? mbox = mailbox.mbox(fp)
>
> > ? ? ? ? ? ? ? ? for key, msg in mbox.iteritems():
> > ? ? ? ? ? ? ? ? ? ? ? ? flags = msg.get_flags()
>
> > ? ? ? ? ? ? ? ? ? ? ? ? if 'R' not in flags:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? # now process the e-mail
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? # now update status
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? msg.add_flag('R' + flags)
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mbox[key] = msg
>
> I have no idea about your problem. However, I believe that ?the last
> statement
> "mbox[key] = msg" is not needed. The objects returned by
> dict.iteritems are not copies but
> the actual ones in the dictionary, so your msg.add_flag() already
> modifies the object in mbox.
>
> HTH
>
> Ciao
> -----
> FB- Hide quoted text -
>
> - Show quoted text -

thanks for your reply. If I delete "mbox[key] = msg", then the actual
files can not be updated for status.


From zutesmog at gmail.com  Mon May 18 11:22:30 2009
From: zutesmog at gmail.com (timh)
Date: Mon, 18 May 2009 08:22:30 -0700 (PDT)
Subject: ? 'in' operator and fallback to __getitem__
Message-ID: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>

Hi

I am trying to understand something about how the 'in' operator (as in
the following expression)

if 'aa' in x:
   do_something()

When trying to implement in support on a class it appears that if
__contains__ doesn't exist
in falls back to calling __getitem__

However strange things happen to the name passed to __getitem__ in the
following example (and in fact in all varients I have triend the name/
key passed to __getitem__ is always the integer 0

For instance

Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class xx(object):
...    def __getitem__(self,name):
...       raise KeyError(name)
...
>>> aa = xx()
>>> aa['kk']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in __getitem__
KeyError: 'kk'
>>> 'kk' in aa
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in __getitem__
KeyError: 0


I am running on ubuntu, and this happens to 2.5.4 as well.  I must say
I am surprised and
am at a loss as to what is actually going on.

Can anyone enlighten me (or should I go and read some 'c' code ;-)

Rgds

Tim


From marco at sferacarta.com  Mon May 18 11:24:02 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Mon, 18 May 2009 17:24:02 +0200
Subject: ? 'in' operator and fallback to __getitem__
In-Reply-To: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>
References: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>
Message-ID: <n4fQl.18513$Ux.1684@tornado.fastwebnet.it>

timh wrote:

> However strange things happen to the name passed to __getitem__ in the
> following example (and in fact in all varients I have triend the name/
> key passed to __getitem__ is always the integer 0

I think it's scanning the container as a sequence and not as a mapping, 
hence the access by index.



From sjmachin at lexicon.net  Mon May 18 11:26:54 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 18 May 2009 15:26:54 +0000 (UTC)
Subject: How can i use Spread Sheet as Data Store
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
Message-ID: <loom.20090518T151856-387@post.gmane.org>

Kalyan Chakravarthy <kalyanchakravarthy <at> hyit.com> writes:

> 
> Hi All,???????????? I have data in Spread Sheet ( First Name and Last Name),
how can i see? this data? in Python code ( how can i use Spread Sheet as Data
Store ) . -- RegardsKalyan

Hi Kalyan,

A few questions ... the answers might help us help you better:

What type of spreadsheet do you have:
.ods (produced by OpenOffice.org's calc)?
.gnumeric?
.xls (MS Excel 2003)?
.xlsx (MS Excel 2007)?
something else?

Do you want to update the spreadsheet using Python, or will that be done
manually? How many rows of data are you likely to have?

What version of Python do you plan to use?

What OS are you using?

Cheers,
John







From aahz at pythoncraft.com  Mon May 18 11:27:44 2009
From: aahz at pythoncraft.com (Aahz)
Date: Mon, 18 May 2009 08:27:44 -0700
Subject: Concurrency Email List
In-Reply-To: <77516220-6589-4592-9673-9FDC1FE74D31@pobox.com>
References: <2F8C1929-B58D-4845-A237-EFAEE8BF753D@pobox.com>
	<20090517002621.GA18009@panix.com>
	<77516220-6589-4592-9673-9FDC1FE74D31@pobox.com>
Message-ID: <20090518152744.GA8435@panix.com>

On Mon, May 18, 2009, Pete wrote:
> On May 16, 2009, at 7:26 PM, Aahz wrote:
>> On Sat, May 16, 2009, Pete wrote:
>>>
>>> python-concurrency at googlegroups.com is a new email list
>>> for discussion of concurrency issues in python.  It arose
>>> out of Dave Beazley's class on the subject last week:
>>> http://www.dabeaz.com/chicago/concurrent.html
>>>
>>> The list wills serve as a forum for discussion of such topics as:
>>>
>>> * threads
>>> * multiprocessing
>>> * asynchronous
>>> * coroutines
>>> * the GIL
>>>
>>> Hope to see you there!  Join at http://groups.google.com/group/python-concurrency/
>>
>> Is there some reason you chose not to create a list on python.org?
>> I'm not joining the list because Google requires that you create a
>> login.
>
> Because it took less time to create the group on Google than it took for 
> me to even find the instructions for doing so on python.org (still  
> looking).  That said, I'm happy to move if someone would like to point  
> me in the right direction/facilitate.

Just send e-mail to postmaster at python.org -- I'll look into making the
instructions clearer/more visible.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From jeff at jmcneil.net  Mon May 18 11:31:44 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Mon, 18 May 2009 08:31:44 -0700 (PDT)
Subject: ? 'in' operator and fallback to __getitem__
References: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>
Message-ID: <973a4430-18df-490b-a65d-f906bd74a691@r13g2000vbr.googlegroups.com>

On May 18, 11:22?am, timh <zutes... at gmail.com> wrote:
> Hi
>
> I am trying to understand something about how the 'in' operator (as in
> the following expression)
>
> if 'aa' in x:
> ? ?do_something()
>
> When trying to implement in support on a class it appears that if
> __contains__ doesn't exist
> in falls back to calling __getitem__
>
> However strange things happen to the name passed to __getitem__ in the
> following example (and in fact in all varients I have triend the name/
> key passed to __getitem__ is always the integer 0
>
> For instance
>
> Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
> [GCC 4.3.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> class xx(object):
>
> ... ? ?def __getitem__(self,name):
> ... ? ? ? raise KeyError(name)
> ...>>> aa = xx()
> >>> aa['kk']
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> ? File "<stdin>", line 3, in __getitem__
> KeyError: 'kk'>>> 'kk' in aa
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> ? File "<stdin>", line 3, in __getitem__
> KeyError: 0
>
> I am running on ubuntu, and this happens to 2.5.4 as well. ?I must say
> I am surprised and
> am at a loss as to what is actually going on.
>
> Can anyone enlighten me (or should I go and read some 'c' code ;-)
>
> Rgds
>
> Tim

See http://docs.python.org/library/functions.html#iter, that ought to
clear it up.

Thanks,

Jeff
mcjeff.blogspot.com


From zutesmog at gmail.com  Mon May 18 11:31:53 2009
From: zutesmog at gmail.com (Tim Hoffman)
Date: Mon, 18 May 2009 08:31:53 -0700 (PDT)
Subject: ? 'in' operator and fallback to __getitem__
References: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>
	<n4fQl.18513$Ux.1684@tornado.fastwebnet.it>
Message-ID: <d40e1713-42f0-4b34-9562-ca07cc91c8e4@r31g2000prh.googlegroups.com>

Hi Marco

Thats definately what I think is happening.

I tried the following

>>> class yy(object):
...   def __getitem__(self,name):
...     raise KeyError(name)
...   def __contains__(self,name):
...     raise KeyError(name)
...
>>> aa = yy()
>>> 'll' in aa
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "<stdin>", line 5, in __contains__
KeyError: 'll'
>>> [i in aa]
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
NameError: name 'i' is not defined
>>> [i for i in aa]
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "<stdin>", line 3, in __getitem__
KeyError: 0
>>>


Which suggests to me there must be some sort of order of precedence
between __contains__ and __getitem__
and 'for' statement must change the order in some manner.

Thanks for the reply


T

On May 18, 11:24?pm, Marco Mariani <ma... at sferacarta.com> wrote:
> timh wrote:
> > However strange things happen to the name passed to __getitem__ in the
> > following example (and in fact in all varients I have triend the name/
> > key passed to __getitem__ is always the integer 0
>
> I think it's scanning the container as a sequence and not as a mapping,
> hence the access by index.



From urbangabo at gmail.com  Mon May 18 11:52:43 2009
From: urbangabo at gmail.com (Gabor Urban)
Date: Mon, 18 May 2009 17:52:43 +0200
Subject: Seeking old post on developers who like IDEs vs developers who 
	like simple languages
Message-ID: <f7ac28aa0905180852h36801930tb6b8be085f0aa33d@mail.gmail.com>

Hi guys,

I think this issue is long-long displute over tools and IDE-s. No need
to combine it with the question of the complexity of the programming
language used.

I know guys, who did every development project using a simple GVIM and
command line tools, and vere extremly productive. Even in Java, C++,
and any other languages. For myself I can say, I am a seasoned Emacs
user, and would not switch to any fancy IDE. BUT that is personal
view.

IMHO this question does not bellong here, though I was very pleased to
read arguments instead of flames.... :-))

Gabor
-- 
Linux: Choice of a GNU Generation


From jonathan.cervidae at gmail.com  Mon May 18 11:55:10 2009
From: jonathan.cervidae at gmail.com (jcervidae)
Date: Mon, 18 May 2009 08:55:10 -0700 (PDT)
Subject: pydb output vanishes when running nosetests doctests
Message-ID: <10e2b00d-f9da-4606-a809-d841905c8915@v17g2000vbb.googlegroups.com>

Hi Pythonistas:

When pydb.debugger() is launched from within my code or for some other
reason pydb starts from inside a nosetests or doctest, I do not see
any output from it. It appears the test has hung but it hasn't. If I
type commands pydb obeys them I just can't see the results. How can I
stop this? It means I have to make minor little programs to re-create
problems the tests were designed to catch in order to debug.


From david_v_wright at yahoo.com  Mon May 18 12:45:01 2009
From: david_v_wright at yahoo.com (david wright)
Date: Mon, 18 May 2009 09:45:01 -0700 (PDT)
Subject: Python code-bloat tool-- warning n00b stuff...
In-Reply-To: <gung8f$q2s$1@ger.gmane.org>
References: <1a3a139e0905161013p2ff1c024l260ad57433e1be20@mail.gmail.com>
	<gung8f$q2s$1@ger.gmane.org>
Message-ID: <147293.52806.qm@web31807.mail.mud.yahoo.com>


----- Original Message ----

From: Robert Kern <robert.kern at gmail.com>
To: python-list at python.org
Sent: Saturday, May 16, 2009 3:55:11 PM
Subject: Re: Python code-bloat tool-- warning n00b stuff...

On 2009-05-16 12:13, anand j wrote:
> Hi,
>      I am looking for a bunch of rules or a tool that takes the code for
> my python class and checks the amount of code bloat and points out where
> i can improve. I am a n00b to python and built an application linking
> wordnet and graph packages. but somehow have this nagging feeling my
> code is too bloated with too many functions..... might just be paranoia
> , but worth an investigation i guess.....
> 
> Sorry if this is a repeat/trivial question, I could not find any
> comprehensive links on google or the mailing list archive that is within
> my gmail. Currently, trying to download the other archives and index
> using whoosh and try searching it.

A slightly more interesting and nontrivial metric that you can apply is cyclomatic complexity. Basically, it is the number of independent code paths your each function may go down.

http://en.wikipedia.org/wiki/Cyclomatic_complexity
http://www.traceback.org/2008/03/31/measuring-cyclomatic-complexity-of-python-code/

This will give a not-too-unreasonable measure of how complicated each function is. I don't know if that's what you are getting at with the term "code bloat".


---


I would suggest looking into TDD (test driven development). 

This technique would be a good fit to eliminate you feeling of code bloat, in TDD you only write the necessary amount
of code to make your test pass, hence you never write code that is not going to be utilized. 

It takes a little while to get used to this technique ( also, it can be much more difficult to apply in some situations) but it's well worth the effort. :). You'll have no trouble finding tons of resources for this topic.


From norseman at hughes.net  Mon May 18 12:51:47 2009
From: norseman at hughes.net (norseman)
Date: Mon, 18 May 2009 09:51:47 -0700
Subject: Just wondering
In-Reply-To: <4A0E00C0.7090908@ieee.org>
References: <mailman.188.1242388571.8015.python-list@python.org>	<Q6dPl.15964$Ux.11735@tornado.fastwebnet.it>
	<4A0DDCA8.3020806@hughes.net> <4A0E00C0.7090908@ieee.org>
Message-ID: <4A119223.7070903@hughes.net>

Dave Angel wrote:
> norseman wrote:
>> <div class="moz-text-flowed" style="font-family: -moz-fixed">Marco 
>> Mariani wrote:
>>> Gediminas Kregzde wrote:
>>>
>>>
>>>> def doit(i):
>>>>    pass
>>>>
>>>> def main():
>>>>    a = [0] * 10000000
>>>>    t = time()
>>>>    map(doit, a)
>>>>    print "map time: " + str(time() - t)
>>>
>>> Here you are calling a function ten million times, build a list with 
>>> of ten million None results, then throw it away.
>>>
>>>
>>>> def main2():
>>>>    t = time()
>>>>    a = [0] * 10000000
>>>>    for i in a:
>>>>        pass
>>>>    print "loop time: " + str(time() - t)
>>>
>>> Here you do nothing but iterating 'i' over the 'a' list.
>>>
>>>
>>>> main()  # takes approximately 5x times longer than main2()
>>>> main2()
>>>>
>>>> I'm wondering were is catch?
>>>
>>> Function calls are not free in python. They cost a lot more than they 
>>> do in C, Delphi or other languages.
>>>
>>
>> Gediminas - You did a good job of testing the overhead.  All good 
>> programmers do that!
>>
>> Steve
>>
>>
> If the task is to test the overhead, then the two loops need to be 
> equivalent.

no they don't. see below

   The OP's conclusion, confirmed by many of you, is that
> map() is lots slower than for.  

is it? see below

But if you add in the call overhead in
> the for loop, they come out within 2 percent.  If you just want to 
> compare map() time to for time, use functions:
> 
> from time import time
> def doit(i):
>   pass
> def main():
>   a = [0] * 10000000
>   t = time()
>   map(doit, a)
>   print "map time: " + str(time() - t)
> 
> def main2():
>   a = [0] * 10000000
>   t = time()
>   for i in a:
>       doit(i)
>   print "loop time: " + str(time() - t)
> 
> 
> main()
> main2()
> 
> gives:
> map time: 4.875
> loop time: 4.79600000381
> 
> 
================================================
Why do tests have to be equal?  If what you are after is to test several 
things just to see what they carry for overhead just do so.  Whether or 
not they are "equal" is a matter of choice.  Doing the map() implies it 
will store something. Doing the loop tells what it takes to loop. THEN, 
by adding your code to each to balance things out and running for time 
will tell you things.  Maybe map() will win and maybe it will not for 
certain objectives. Maybe loop will win under certain conditions. 
Without a baseline and testing - any statement as to which is better is 
simply unrealistic nonsense.  The 'internals', algorithms, can often be 
optimized after inspection to obtain better results.  Whether or not 
these optimizations will interfere with a another function (in this case 
map() ) remains to be tested.  Just because the minimal overhead on A is 
less than B does not mean that A is the better choice for a given situation.

By the way, since any loop action actually needs some sort of counter, 
be it the here to end of file or a numeric countdown, I put my timer 
before def main? and check the whole test of minimal parts.  People who 
write compilers and/or interpreters often do strange things with 
optimization concepts.

Dave's' times point out that loop has a good chance to win if the rest 
of that sections code were present. By that I mean the actual function 
the loop or map() were to preform in a given setting.  It shows the 
function call is expensive.  Thus in-line code can be a better choice 
when speed is needed. At least in Python and given the results of both 
tests of loop above.

Also depicted is that map() requires the expensive function call and 
loop does not in order to process something.



the def doit(i):
   pass
should result in something like:

.
.
push data_address in R2
call address_of_doit
.
.


address_of_doit
pop data_address to R1              #see note 1
return                              #see note 2



note 1:  not all OS/architectures  implement push/pop
          whatever the store/call  retrieve/(store)/return  may be,
          it will be the same throughout for that OS/machine.

note 2:  a call to a dummy will show the efficiency of calling.
          normally - its overhead is quite minimal.  As another stated
          above - such things are indeed expensive in Python.




All this generated by someone posting a simple overhead test.  WOW.
I guess I had a better teacher than I thought. :)


IMHO - Dave's loop test should have been included in the original 
posting. Making three tests all together at that time.  But then we all 
had different teachers.  Which is why the question came up.


Steve


From 89dragon at gmail.com  Mon May 18 12:58:17 2009
From: 89dragon at gmail.com (Chris Hughes)
Date: Mon, 18 May 2009 09:58:17 -0700
Subject: Fedora root access with python
Message-ID: <4A1193A9.3070506@gmail.com>

I've written some software for ubuntu/debian linux and am porting it 
over to RPM-based distros and have relied heavily on gksu being called 
internally to perform root tasks with a graphical password. However 
fedora seems to have another system of authenticating root access, how 
do I do that graphically via an internal command line or through python?

http://www.gtk-apps.org/content/show.php/Wacom+Control+Panel?content=104309


From gunterhenriksen at gmail.com  Mon May 18 13:14:31 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Mon, 18 May 2009 10:14:31 -0700
Subject: Context manager, atexit processing, and PEP 3143 
	DaemonContext.close
In-Reply-To: <87hbzk8eoh.fsf@benfinney.id.au>
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>
	<87hbzk8eoh.fsf@benfinney.id.au>
Message-ID: <ab4fa3490905181014v11bb0746p2f81f3a00dac9b8a@mail.gmail.com>

> Anyone else?

If there is a function which triggers a one-shot switch, I
like to have a way to find out if it has already been triggered,
I prefer to have the function tell me if it triggered the switch
or not, but I would not want that to be by raising an exception.


From jeff at jmcneil.net  Mon May 18 13:15:19 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Mon, 18 May 2009 10:15:19 -0700 (PDT)
Subject: ? 'in' operator and fallback to __getitem__
References: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>
	<n4fQl.18513$Ux.1684@tornado.fastwebnet.it>
	<d40e1713-42f0-4b34-9562-ca07cc91c8e4@r31g2000prh.googlegroups.com>
Message-ID: <f0d15382-b81f-4008-8426-44b739ee8300@z7g2000vbh.googlegroups.com>

On May 18, 11:31?am, Tim Hoffman <zutes... at gmail.com> wrote:
> Hi Marco
>
> Thats definately what I think is happening.
>
> I tried the following
>
> >>> class yy(object):
>
> ... ? def __getitem__(self,name):
> ... ? ? raise KeyError(name)
> ... ? def __contains__(self,name):
> ... ? ? raise KeyError(name)
> ...>>> aa = yy()
> >>> 'll' in aa
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in ?
> ? File "<stdin>", line 5, in __contains__
> KeyError: 'll'>>> [i in aa]
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in ?
> NameError: name 'i' is not defined>>> [i for i in aa]
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in ?
> ? File "<stdin>", line 3, in __getitem__
> KeyError: 0
>
>
>
> Which suggests to me there must be some sort of order of precedence
> between __contains__ and __getitem__
> and 'for' statement must change the order in some manner.
>
> Thanks for the reply
>
> T
>
> On May 18, 11:24?pm, Marco Mariani <ma... at sferacarta.com> wrote:
>
> > timh wrote:
> > > However strange things happen to the name passed to __getitem__ in the
> > > following example (and in fact in all varients I have triend the name/
> > > key passed to __getitem__ is always the integer 0
>
> > I think it's scanning the container as a sequence and not as a mapping,
> > hence the access by index.
>
>

Whoops, I just realized I posted the wrong link...

http://docs.python.org/reference/expressions.html#in

Jeff


From jdoe at usenetlove.invalid  Mon May 18 13:23:24 2009
From: jdoe at usenetlove.invalid (John Doe)
Date: Mon, 18 May 2009 17:23:24 GMT
Subject: The ultimate in voice-powered scripting in Windows... need help
Message-ID: <gQgQl.29479$yr3.25296@nlpi068.nbdc.sbc.com>


http://code.google.com/p/dragonfly/

The help I need probably requires a Python programmer to become 
familiar with the project. I cannot tell exactly how much syntax versus 
logic is involved. But if you have ever had any interest in 
voice/speech activated system wide scripting in Windows, this Dragonfly 
is the tool. The upcoming big difference in speech powered scripting 
included in Dragonfly is the advent of continuous command recognition 
also known as "command sequences". Now a user will be able to make a 
vocabulary of words, and string them together in any order to make 
phrases, for computer command and control that is similar to a human 
language.

Specifically.

I need a comprehensive example command module for Dragonfly.

Apparently, continuous command recognition (command sequences) do not 
work outside of the (_multiedit.py) command module file.

I could use the help of some Dragonfly interested Python programmer who 
will include a program/window specific script inside of (_multiedit.py) 
as an example that I can duplicate inside of that same file for other 
window specific scripts.

My goal is to enable hacker-accessible global and window specific 
scripting for Dragon Naturally Speaking, taking advantage of 
Dragonfly's ability to do continuous command recognition and including 
all of Dragonfly's basic scripting functions (as apparently 
_multiedit.py does). So far, I have figured out how to do most of it, 
with that important exception.

Thanks.



By the way. My gung-ho interest in Dragonfly is strictly personal. I 
shill for no one.



-- 
Interested in making Windows and games obey your verbal commands? 
Continuous command recognition (much easier than speech recognition) 
can now be enabled using Naturally Speaking and freeware Dragonfly. 
See (comp.lang.beta) for discussion.


From deets at nospam.web.de  Mon May 18 13:35:52 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 18 May 2009 19:35:52 +0200
Subject: pydb output vanishes when running nosetests doctests
References: <10e2b00d-f9da-4606-a809-d841905c8915@v17g2000vbb.googlegroups.com>
Message-ID: <77dkfoF1ggn85U1@mid.uni-berlin.de>

jcervidae wrote:

> Hi Pythonistas:
> 
> When pydb.debugger() is launched from within my code or for some other
> reason pydb starts from inside a nosetests or doctest, I do not see
> any output from it. It appears the test has hung but it hasn't. If I
> type commands pydb obeys them I just can't see the results. How can I
> stop this? It means I have to make minor little programs to re-create
> problems the tests were designed to catch in order to debug.

Use the "-s"-option which prevents nose from capturing the stdout and not
printing it immediately.

Diez


From google at mrabarnett.plus.com  Mon May 18 13:43:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 18 May 2009 18:43:59 +0100
Subject: Context manager, atexit processing,
	and PEP 3143 	DaemonContext.close
In-Reply-To: <ab4fa3490905181014v11bb0746p2f81f3a00dac9b8a@mail.gmail.com>
References: <87bppsa6y8.fsf@benfinney.id.au>	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>	<87tz3k8lfc.fsf@benfinney.id.au>	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>	<87hbzk8eoh.fsf@benfinney.id.au>
	<ab4fa3490905181014v11bb0746p2f81f3a00dac9b8a@mail.gmail.com>
Message-ID: <4A119E5F.6010304@mrabarnett.plus.com>

Gunter Henriksen wrote:
>> Anyone else?
> 
> If there is a function which triggers a one-shot switch, I
> like to have a way to find out if it has already been triggered,
> I prefer to have the function tell me if it triggered the switch
> or not, but I would not want that to be by raising an exception.

The 'file' class also has a 'closed' method, so that's a good model to
follow.


From phd at phd.pp.ru  Mon May 18 14:12:24 2009
From: phd at phd.pp.ru (Oleg Broytmann)
Date: Mon, 18 May 2009 22:12:24 +0400
Subject: SQLObject 0.9.11
Message-ID: <20090518181224.GB13292@phd.pp.ru>

Hello!

I'm pleased to announce version 0.9.11, a minor bugfix release of 0.9 branch
of SQLObject.


What is SQLObject
=================

SQLObject is an object-relational mapper.  Your database tables are described
as classes, and rows are instances of those classes.  SQLObject is meant to be
easy to use and quick to get started with.

SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).


Where is SQLObject
==================

Site:
http://sqlobject.org

Development:
http://sqlobject.org/devel/

Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss

Archives:
http://news.gmane.org/gmane.comp.python.sqlobject

Download:
http://cheeseshop.python.org/pypi/SQLObject/0.9.11

News and changes:
http://sqlobject.org/News.html


What's New
==========

News since 0.9.10
----------------

* Two bugs in SQLiteConnection.columnsFromSchema() were fixed: use
  sqlmeta.idName instead of 'id'; convert default 'NULL' to None.

* Use sqlmeta.idName instead of 'id' in all connection classes.

* Fixed a bug that prevented to override per class _connection if there is
  sqlhub.processConnection.

For a more complete list, please see the news:
http://sqlobject.org/News.html

Oleg.
-- 
     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.


From phd at phd.pp.ru  Mon May 18 14:14:24 2009
From: phd at phd.pp.ru (Oleg Broytmann)
Date: Mon, 18 May 2009 22:14:24 +0400
Subject: SQLObject 0.10.6
Message-ID: <20090518181424.GF13292@phd.pp.ru>

Hello!

I'm pleased to announce version 0.10.6, a minor bugfix release of 0.10 branch
of SQLObject.


What is SQLObject
=================

SQLObject is an object-relational mapper.  Your database tables are described
as classes, and rows are instances of those classes.  SQLObject is meant to be
easy to use and quick to get started with.

SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).


Where is SQLObject
==================

Site:
http://sqlobject.org

Development:
http://sqlobject.org/devel/

Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss

Archives:
http://news.gmane.org/gmane.comp.python.sqlobject

Download:
http://cheeseshop.python.org/pypi/SQLObject/0.10.6

News and changes:
http://sqlobject.org/News.html


What's New
==========

News since 0.10.5
-----------------

* Better support for Python 2.6: do not import the deprecated sets module.

* Two bugs in SQLiteConnection.columnsFromSchema() were fixed: use
  sqlmeta.idName instead of 'id'; convert default 'NULL' to None.

* Use sqlmeta.idName instead of 'id' in all connection classes.

* Fixed a bug that prevented to override per class _connection if there is
  sqlhub.processConnection.

For a more complete list, please see the news:
http://sqlobject.org/News.html

Oleg.
-- 
     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.


From bigblueswope at gmail.com  Mon May 18 14:20:51 2009
From: bigblueswope at gmail.com (BJ Swope)
Date: Mon, 18 May 2009 14:20:51 -0400
Subject: How to get Exif data from a jpeg file
In-Reply-To: <m2octsnny5.fsf@googlemail.com>
References: <m263g1pbl7.fsf@googlemail.com>
	<mailman.265.1242504138.8015.python-list@python.org>
	<m2octsnny5.fsf@googlemail.com>
Message-ID: <fca207170905181120m3b87d332l4aaf2431e3f9e69c@mail.gmail.com>

On Sun, May 17, 2009 at 4:17 AM, Arnaud Delobelle
<arnodel at googlemail.com> wrote:
>
> Daniel Fetchinson <fetchinson at googlemail.com> writes:
>
> >> I need to get the creation date from a jpeg file in Python. ?Googling
> >> brought up a several references to apparently defunct modules. ?The best
> >> way I have been able to find so far is something like this:
> >>
> >> from PIL import Image
> >> img = Image.open('img.jpg')
> >> exif_data = img._getexif()
> >> creation_date = exif_data[36867]
> >>
> >> Where 36867 is the exif tag for the creation date data (which I found by
> >> ooking at PIL.ExifTags.TAGS). ?But this doesn't even seem to be
> >> documented in the PIL docs. ?Is there a more natural way to do this?
> >
> >
> > Have you tried http://sourceforge.net/projects/exif-py/ ?
> >
> > HTH,
> > Daniel
>
> I will have a look - thank you.
>
> --
> Arnaud
> --
> http://mail.python.org/mailman/listinfo/python-list


I use the EXIF module to do bulk renames of all the pictures in a directory.

Here's my hackeration...



import sys
import os
import re
import time
import win32file
import datetime
import EXIF

DATE_FORMAT?? = '%Y%m%d_%H%M%S'
allowed_files = ['.asf', '.jpg', '.mod', '.mov', '.mpeg', '.mpg',
'.jpeg', '.png', '.tiff', '.tif']
named_files = []

r = re.compile('.mod',)

def is_a_file(path, file, xtn):
??? """
??? We only want to rename the files right?
??? Return True or False depending on whether object is a file or a directory
??? """

??? if os.path.isdir(os.path.join(path,file)):
??????? print "This is a directory not a file.? Will not rename!"
??????? return False
??? if allowed_files.count(xtn):
??????? return True
??? else:
??????? print file, "is not a in the list of allowed extensions. Will
not rename!"
??????? return False


def renameFile(path, file):
??? """ Rename <old_filename> with the using the date/time created or
modified for the new file name"""

??? old_filename = os.path.join(path,file)

??? (name,xtn) = os.path.splitext(file)
??? xtn = xtn.lower()

??? if re.search(r, xtn):
??????? xtn_old = xtn
??????? xtn = '.mpg'
??????? print xtn_old, 'changed to', xtn

??? if is_a_file(path, file, xtn):
??????? created_time = os.path.getctime(old_filename)
??????? modify_time = os.path.getmtime(old_filename)

??????? f = open(old_filename, 'rb')
??????? try:
??????????? tags=EXIF.process_file(f)
??????? except UnboundLocalError:
??????????? print "No EXIF data available for ", file
??????????? tags = {}
??????????? exif_time = 0
??????? try:
??????????? tags['EXIF DateTimeOriginal']
??????????? exif_time = str(tags['EXIF DateTimeOriginal'])
??????????? exif_time = int(time.mktime(time.strptime(exif_time,
"%Y:%m:%d %H:%M:%S")))
??????? except (KeyError,ValueError):
??????????? print 'No EXIF DateTimeOriginal for ', file
??????????? exif_time = 0
??????? f.close()

??????? if created_time < modify_time:
??????????? local_time = time.localtime(created_time)
??????? else:
??????????? local_time = time.localtime(modify_time)

??????? if exif_time:
??????????? if exif_time < local_time:
??????????????? local_time = time.localtime(exif_time)

??????? date_time_name = time.strftime(DATE_FORMAT, local_time)

??????? copy_number = named_files.count(date_time_name)
??????? named_files.append(date_time_name)

??????? new_name = date_time_name + "_" + str(copy_number) + xtn

??????? new_filename = os.path.join(path, new_name)

??????? print 'Renaming:', old_filename, 'to', new_filename
??????? #print 'Created Time? = ', created_time
??????? #print 'Modified Time = ', modify_time
??????? #print 'EXIF Time???? = ', exif_time
??????? #print 'Time Used???? = ', local_time
??????? os.rename(old_filename, new_filename)


if __name__ == '__main__':
??? if os.path.isdir(sys.argv[1]):
??????? """Recursively walk the directory listed as Arg 1 and work each file."""
??????? print
??????? for path,dirs,files in os.walk(sys.argv[1]):
??????????? for file in files:
??????????????? renameFile(path, file)
??? else:
??????? print "\nNo path to rename specified.\n"
??????? print "Usage:\n\tpython", sys.argv[0], "<path to directory of
source files>"
??????? sys.exit(1)




--
We are all slave to our own paradigm. -- Joshua Williams

If the letters PhD appear after a person's name, that person will
remain outdoors even after it's started raining. -- Jeff Kay

Fascism is a term used to describe authoritarian nationalist political
ideologies or mass movements that are concerned with notions of
cultural decline or decadence and seek to achieve a millenarian
national rebirth by exalting the nation or race, and promoting cults
of unity, strength and purity. - Wikipedia

The story of postwar American conservatism is best understood as a
continual replay of a single long-standing debate. On one side are
those who have upheld the Burkean ideal of replenishing civil society
by adjusting to changing conditions. On the other are those committed
to a revanchist counterrevolution, the restoration of America's
pre-welfare state ancien regime. And, time and again, the
counterrevolutionaries have won. The result is that modern American
conservatism has dedicated itself not to fortifying and replenishing
civil society but rather to weakening it through a politics of civil
warfare. -- Sam Tanenhaus


From george.sakkis at gmail.com  Mon May 18 14:58:45 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Mon, 18 May 2009 11:58:45 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
Message-ID: <c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com>

On May 18, 5:27?am, jer... at martinfamily.freeserve.co.uk wrote:

> My suggestion is primarily about using multiple threads and sharing
> memory - something akin to the OpenMP directives that one of you has
> mentioned. To do this efficiently would involve removing the Global
> Interpreter Lock, or switching to Jython or Iron Python as you
> mentioned.
>
> However I *do* actually want to add syntax to the language.

Good luck with that. The GIL is not going away any time soon (or
probably ever) and as long as CPython is the "official"
implementation, there are almost zero chances of adding syntax support
for this. Besides, Guido and other py-devs are not particularly keen
on threads as a parallelization mechanism.

George


From tjreedy at udel.edu  Mon May 18 15:12:50 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 18 May 2009 15:12:50 -0400
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
Message-ID: <gusbvf$s24$1@ger.gmane.org>

Kalyan Chakravarthy wrote:
> Hi All,
>              I have data in Spread Sheet ( First Name and Last Name), 
> how can i see  this data  in Python code ( how can i use Spread Sheet as 
> Data Store ) .

I you have a choice, a plain text file is MUCH easier.

Or, you can output a plain text data.csv (comma-separated variable) file 
from the spreadsheet and read that with the csv module.



From tjreedy at udel.edu  Mon May 18 15:20:29 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 18 May 2009 15:20:29 -0400
Subject: ? 'in' operator and fallback to __getitem__
In-Reply-To: <d40e1713-42f0-4b34-9562-ca07cc91c8e4@r31g2000prh.googlegroups.com>
References: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>	<n4fQl.18513$Ux.1684@tornado.fastwebnet.it>
	<d40e1713-42f0-4b34-9562-ca07cc91c8e4@r31g2000prh.googlegroups.com>
Message-ID: <guscdq$s24$2@ger.gmane.org>

Tim Hoffman wrote:

>>>> [i for i in aa]
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
>   File "<stdin>", line 3, in __getitem__
> KeyError: 0
> 
> 
> Which suggests to me there must be some sort of order of precedence
> between __contains__ and __getitem__
> and 'for' statement must change the order in some manner.

The 'in' part of for statements has nothing to do with the 'in' 
comparison operator.  For loops first look for .__iter__ and .__next__ 
and fall back to .__getitem__.



From laurentluce49 at yahoo.com  Mon May 18 15:30:28 2009
From: laurentluce49 at yahoo.com (Laurent Luce)
Date: Mon, 18 May 2009 12:30:28 -0700 (PDT)
Subject: strip char from list of strings
Message-ID: <195055.64779.qm@web54204.mail.re2.yahoo.com>


I have the following list:

[ 'test\n', test2\n', 'test3\n' ]

I want to remove the '\n' from each string in place, what is the most efficient way to do that ?

Regards,

Laurent


From sverreodegard at gmail.com  Mon May 18 15:52:52 2009
From: sverreodegard at gmail.com (Sverre)
Date: Mon, 18 May 2009 12:52:52 -0700 (PDT)
Subject: Package problem
Message-ID: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>

I'm using Ubuntu and some of the packages in the repository are too
old. So I got the thought to remove nearly  all packages downloaded
from the repository and install them with easy_install. Is this a way
to go without greater problems?


From socyl at 987jk.com.invalid  Mon May 18 16:04:08 2009
From: socyl at 987jk.com.invalid (kj)
Date: Mon, 18 May 2009 20:04:08 +0000 (UTC)
Subject: Advanced Python books?
Message-ID: <gusevn$jjd$1@reader1.panix.com>



I have read a couple of "learn Python"-type books, and now I'm
looking for some more advanced books on Python, something analogous
to "Effective Java" or "High-Order Perl".  I've only been able to
find "Advanced Python 3 Programming Techniques", which, as far as
I can tell, is only available as a "Kindle Book".  (Since I won't
be buying a Kindle for another few decades, this is not an option
for me.)

I tried out "Dive into Python", because I was told that it was
written for people with prior programming experience.  It's an OK
book, but I don't find that it is much more advanced than pretty
much any other "learn Python" book I've seen.

Basically I'm looking for a book that assumes that one has the
basics of the language down, and instead focuses on standard problems
of software development, such as application architecture and
design, prototyping, debugging, profiling and performance-tuning,
testing, packaging/distribution, extending/embedding, threading
and IPC, persistence, etc., and on various prototypical cases such
as command-line utilities, GUI-apps, webapps, database-backed apps,
simulations, etc.

Granted, it is unlikely that a single book will do justice to all
these areas, but these are the topics I'm now interested in, from
the perspective of Python.

Any suggestions?

TIA!
-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From tjreedy at udel.edu  Mon May 18 16:07:26 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 18 May 2009 16:07:26 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com>
Message-ID: <gusf5s$9bu$1@ger.gmane.org>

George Sakkis wrote:
> On May 18, 5:27 am, jer... at martinfamily.freeserve.co.uk wrote:
> 
>> My suggestion is primarily about using multiple threads and sharing
>> memory - something akin to the OpenMP directives that one of you has
>> mentioned. To do this efficiently would involve removing the Global
>> Interpreter Lock, or switching to Jython or Iron Python as you
>> mentioned.
>>
>> However I *do* actually want to add syntax to the language.

I can understand you having a preference, but you may have to choose 
between fighting over that method or achieving results.  I agree with ...
> Good luck with that. The GIL is not going away any time soon (or
> probably ever) and as long as CPython is the "official"
> implementation, there are almost zero chances of adding syntax support
> for this. Besides, Guido and other py-devs are not particularly keen
> on threads as a parallelization mechanism.

Parallel processes can run on multiple processors as well as multiple 
cores within a processor.  Some problems, like massive search, require 
multiple disks (or memories, or IO ports) as well as multiple processing 
units.  There is debate over how useful massively multicore processors 
will actually be and for which types of problems.

tjr



From UrsusMaximus at gmail.com  Mon May 18 16:12:49 2009
From: UrsusMaximus at gmail.com (UrsusMaximus at gmail.com)
Date: Mon, 18 May 2009 13:12:49 -0700 (PDT)
Subject: Advanced Python books?
References: <gusevn$jjd$1@reader1.panix.com>
Message-ID: <9e2f3765-9ca6-4269-9b11-c75c8cd3ff9a@k9g2000pra.googlegroups.com>

You might try Expert Python Programming by Tarek Ziad?. It is a
relatively recent book aimed at "experts". There are several reviews
of the book linked to from <a href="http://www.awaretek.com/
book.html">this page</a>.

Ron


On May 18, 1:04?pm, kj <so... at 987jk.com.invalid> wrote:
> I have read a couple of "learn Python"-type books, and now I'm
> looking for some more advanced books on Python, something analogous
> to "Effective Java" or "High-Order Perl". ?I've only been able to
> find "Advanced Python 3 Programming Techniques", which, as far as
> I can tell, is only available as a "Kindle Book". ?(Since I won't
> be buying a Kindle for another few decades, this is not an option
> for me.)
>
> I tried out "Dive into Python", because I was told that it was
> written for people with prior programming experience. ?It's an OK
> book, but I don't find that it is much more advanced than pretty
> much any other "learn Python" book I've seen.
>
> Basically I'm looking for a book that assumes that one has the
> basics of the language down, and instead focuses on standard problems
> of software development, such as application architecture and
> design, prototyping, debugging, profiling and performance-tuning,
> testing, packaging/distribution, extending/embedding, threading
> and IPC, persistence, etc., and on various prototypical cases such
> as command-line utilities, GUI-apps, webapps, database-backed apps,
> simulations, etc.
>
> Granted, it is unlikely that a single book will do justice to all
> these areas, but these are the topics I'm now interested in, from
> the perspective of Python.
>
> Any suggestions?
>
> TIA!
> --
> NOTE: In my address everything before the first period is backwards;
> and the last period, and everything after it, should be discarded.



From python at bdurham.com  Mon May 18 16:22:42 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 18 May 2009 16:22:42 -0400
Subject: Advanced Python books?
In-Reply-To: <gusevn$jjd$1@reader1.panix.com>
References: <gusevn$jjd$1@reader1.panix.com>
Message-ID: <1242678162.16562.1316079797@webmail.messagingengine.com>

Take a look at "Text Processing In Python" by David Mertz. This book
doesn't cover all your requirements, but its a well-written book that is
more comprehensive than its title might indicate.

There's also a free version of this book online.

Malcolm


From notontheweb at noisp.com  Mon May 18 16:27:40 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Mon, 18 May 2009 13:27:40 -0700
Subject: Which C compiler?
In-Reply-To: <4a11092f$0$30903$9b622d9e@news.freenet.de>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>
	<4a11092f$0$30903$9b622d9e@news.freenet.de>
Message-ID: <1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>

Martin v. L?wis wrote:
> Jive Dadson wrote:
>> I am using Python 2.4.  I need to make a native Python extension for
>> Windows XP.  I have both VC++ 6.0 and Visual C++ 2005 Express Edition.
>> Will VC++ 6.0 do the trick?  That would be easier for me, because the
>> project is written for that one.  If not, will the 2005 compiler do it?
> 
> In general, to build extension modules, you need to use the same VC
> version as the one that was used to build Python. For 2.4, that would
> be Visual Studio 2003. So if you use VC 6, VS 2005, or VS 2008, you
> may run into problems.
> 
> Depending on what exactly the extension module does, it might work
> fine also.
> 
> Regards,
> Martin

Thanks.  I think I might just use some variety of Popen instead.  I 
don't need much communication between the C++ application and Python, 
and it's not time-critical.  I cannot get flush() to work on the Python 
side of the pipe however I try.  That seems to be a common complaint. 
But I can work around it.

I love Python, but the update regimen is very frustrating.  It's a 
misery to me why every major release requires new versions of so much 
application stuff.  No other software that I use is like that.  When I 
upgrade Windoze, I do not have to get new matching versions of all my 
editors, browsers, and whatnot.  But Python makes me do that, and that's 
why I am stuck on release 2.4.  Even the pure Python stuff needs to be 
copied from one "site-packages" to another.  Then I have to figure out 
why it won't work.  I have fought my way through the upgrade path twice, 
and I just can't face it again.

Thus endeth the rant.


From a.cavallo at cavallinux.eu  Mon May 18 16:34:17 2009
From: a.cavallo at cavallinux.eu (A. Cavallo)
Date: Mon, 18 May 2009 21:34:17 +0100
Subject: Package problem
In-Reply-To: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
Message-ID: <200905182134.18454.a.cavallo@cavallinux.eu>

On Monday 18 May 2009 20:52:52 Sverre wrote:
> I'm using Ubuntu and some of the packages in the repository are too
> old. So I got the thought to remove nearly  all packages downloaded
> from the repository and install them with easy_install. Is this a way
> to go without greater problems?

If you're installing as root probably this will cause a dependency nightmare.

Installing any file in the filesystem without using a package manager 
(deb/rpm) will garantee these files will be overwritten on the next 
update/upgrade (it can be triggered also by another package).

Regards,
Antonio


From jeremy at martinfamily.freeserve.co.uk  Mon May 18 16:52:12 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Mon, 18 May 2009 13:52:12 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com>
Message-ID: <ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com>

On 18 May, 19:58, George Sakkis <george.sak... at gmail.com> wrote:
> On May 18, 5:27?am, jer... at martinfamily.freeserve.co.uk wrote:
>
> > My suggestion is primarily about using multiple threads and sharing
> > memory - something akin to the OpenMP directives that one of you has
> > mentioned. To do this efficiently would involve removing the Global
> > Interpreter Lock, or switching to Jython or Iron Python as you
> > mentioned.
>
> > However I *do* actually want to add syntax to the language.
>
> Good luck with that. The GIL is not going away any time soon (or
> probably ever) and as long as CPython is the "official"
> implementation, there are almost zero chances of adding syntax support
> for this. Besides, Guido and other py-devs are not particularly keen
> on threads as a parallelization mechanism.
>
> George

Hi George,

> The GIL is not going away any time soon (or probably ever) and as long as CPython is
> the "official" implementation, there are almost zero chances of adding syntax support
> for this.

What concerns me about this statement is that, if it is true, Python
risks falling behind when other languages which can exploit multicore
effectively start to come to the fore. I know that Microsoft is
actively researching in this area and they are hoping that F# will
offer good ways to exploit multi-core architectures.

As I understand it the reason for the GIL is to prevent problems with
garbage collection in multi-threaded applications. Without it the
reference count method is prone to race conditions. However it seems
like a fairly crude mechanism to solve this problem. Individual
semaphores could be used for each object reference counter, as in
Java.

Jeremy


From jeremy at martinfamily.freeserve.co.uk  Mon May 18 16:56:38 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Mon, 18 May 2009 13:56:38 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com> 
	<mailman.349.1242677260.8015.python-list@python.org>
Message-ID: <c43e9e94-dfcd-43d1-b29f-482aca4d7815@e24g2000vbe.googlegroups.com>

On 18 May, 21:07, Terry Reedy <tjre... at udel.edu> wrote:
> George Sakkis wrote:
> > On May 18, 5:27 am, jer... at martinfamily.freeserve.co.uk wrote:
>
> >> My suggestion is primarily about using multiple threads and sharing
> >> memory - something akin to the OpenMP directives that one of you has
> >> mentioned. To do this efficiently would involve removing the Global
> >> Interpreter Lock, or switching to Jython or Iron Python as you
> >> mentioned.
>
> >> However I *do* actually want to add syntax to the language.
>
> I can understand you having a preference, but you may have to choose
> between fighting over that method or achieving results. ?I agree with ...
>
> > Good luck with that. The GIL is not going away any time soon (or
> > probably ever) and as long as CPython is the "official"
> > implementation, there are almost zero chances of adding syntax support
> > for this. Besides, Guido and other py-devs are not particularly keen
> > on threads as a parallelization mechanism.
>
> Parallel processes can run on multiple processors as well as multiple
> cores within a processor. ?Some problems, like massive search, require
> multiple disks (or memories, or IO ports) as well as multiple processing
> units. ?There is debate over how useful massively multicore processors
> will actually be and for which types of problems.
>
> tjr

Hi Terry,

> Parallel processes can run on multiple processors as well as multiple
> cores within a processor.  Some problems, like massive search, require
> multiple disks (or memories, or IO ports) as well as multiple processing
> units.  There is debate over how useful massively multicore processors
> will actually be and for which types of problems.

I agree with this. My approach is in the same space as OpenMP - a
simple way for users to define shared memory parallelism. There is no
reason why it would not work with multiple disks or IO ports on the
same shared memory server. However for distributed memory hardware it
would be a non-starter. In that case we would need something like the
Message Passing Interface.

Jeremy


From davea at ieee.org  Mon May 18 17:24:12 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 18 May 2009 17:24:12 -0400
Subject: ? 'in' operator and fallback to __getitem__
In-Reply-To: <d40e1713-42f0-4b34-9562-ca07cc91c8e4@r31g2000prh.googlegroups.com>
References: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>	<n4fQl.18513$Ux.1684@tornado.fastwebnet.it>
	<d40e1713-42f0-4b34-9562-ca07cc91c8e4@r31g2000prh.googlegroups.com>
Message-ID: <4A11D1FC.1090504@ieee.org>

Tim Hoffman wrote:
>
> Which suggests to me there must be some sort of order of precedence
> between __contains__ and __getitem__
> and 'for' statement must change the order in some manner.
>
> Thanks for the reply
>
>
> T
>   
>
(Please don't top-post.  It makes reading the quoted portions hard, 
since they're then out of order.   To solve the problem here, I had to 
delete the other parts)

"in" is both a keyword and an operator, with entirely different semantics.

As a keyword, it's used inside a   for statement, the expression (after 
the in) must return an iterable object.

As an operator, it's used inside an arbitrary expression.  It is this 
case which is described in the docs:

 >>>For user-defined classes which define the __contains__() 
<datamodel.html#object.__contains__> method, x in y is true if and only 
if y.__contains__(x) is true.

 >>>For user-defined classes which do not define __contains__() 
<datamodel.html#object.__contains__> and do define __getitem__(), 
<datamodel.html#object.__getitem__>
 >>> x in y is true if and only if there is a non-negative integer index 
/i/ such that x == y[i],
 >>> and all lower integer indices do not raise IndexError 
<../library/exceptions.html#exceptions.IndexError> exception. (If any 
other exception is
 >>>raised, it is as if in <#in> raised that exception).



 


From paul at boddie.org.uk  Mon May 18 17:31:02 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Mon, 18 May 2009 14:31:02 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
Message-ID: <701b8548-6fe8-41aa-9a0e-f668f6851fcb@b1g2000vbc.googlegroups.com>

On 18 Mai, 11:27, jer... at martinfamily.freeserve.co.uk wrote:
>
> Thanks for your responses to my original questions.

Thanks for your interesting response!

> Paul, thanks for explaining about the pprocess module which appears
> very useful. I presume that this is using multiple operating system
> processes rather than threads which would probably imply that it is
> suitable for coarse grained parallel programming rather than fine-
> grained because of overhead in starting up new processes and sharing
> objects. (How is that done, by the way?). It probably has advantages
> and disadvantages compared with thread based parallelism.

Communication via interprocess channels is done using pickled objects.
For large data volumes, the most efficient approach can actually
involve the filesystem. My opinion on the threads vs. processes debate
centres on the relative efficiency of creating processes on systems
which have evolved to minimise the cost of doing so: people seem to
believe that forking a process creates an entirely new copy, but this
is unlikely to be the case on most modern, popular general-purpose
operating systems.

> My suggestion is primarily about using multiple threads and sharing
> memory - something akin to the OpenMP directives that one of you has
> mentioned. To do this efficiently would involve removing the Global
> Interpreter Lock, or switching to Jython or Iron Python as you
> mentioned.

One could always share memory using processes: I think the ease of
doing so is the only argument for using threads, and the caveats
involved obviously lead us back to the global interpreter lock (in the
threaded situation).

> However I *do* actually want to add syntax to the language. I think
> that 'par' makes sense as an official Python construct - we already
> have had this in the Occam programming language for twenty-five years.
> The reason for this is ease of use. I would like to make it easy for
> amateur programmers to exploit natural parallelism in their
> algorithms. For instance somebody who wishes to calculate a property
> of each member from a list of chemical structures using the Python
> Daylight interface: with my suggestion they could potentially get a
> massive speed up just by changing 'for' to 'par' or 'map' to 'pmap'.
> (Or map with a parallel keyword argument set as suggested). At present
> they would have to manually chop up their work and run it as multiple
> processes in order to achieve the same - fine for expert programmers
> but not reasonable for people working in other domains who wish to use
> Python as a utility because of its fantastic productivity and ease of
> use.

Well, you have to know that the components actually lend themselves to
parallelisation, and the "chopping up" of the work would be similar to
that involved with one of the parallel processing libraries today: you
call something in each iteration that actually goes off with its own
piece of the data and runs in parallel.

> Let me clarify what I think par, pmap, pfilter and preduce would mean
> and how they would be implemented. A par loop is like a for loop,
> however the programmer is saying that the order in which the
> iterations are performed doesn't matter and they might be performed in
> parallel.

Actually, with pprocess's abstractions, the iteration ordering doesn't
really matter, either, although the processes are dispatched in order.
It's when the results are collected that the ordering matters: the
difference between maps and queues. (I suppose it's similar with other
libraries.)

>           The python system then has the option to allocate a number
> of threads to the task and share out the iterations accordingly
> between the threads. (It might be that the programmer should be
> allowed to explictly define the number of threads to use or can
> delegate that decision to the system). Parallel pmap and pfilter would
> be implemented in much the same way, although the resultant list might
> have to be reassembled from the partial results returned from each
> thread. As people have pointed out, parallel reduce is a tricky option
> because it requires the binary operation to be associative in which
> case it can be parallelised by calculating the result using a tree-
> based evaluation strategy.

The sharing out of tasks to threads or execution contexts is done
using various abstractions in pprocess which probably resemble the
"pool" abstraction in the multiprocessing library: only as tasks are
completed are the free resources allocated to new tasks. A parallel
reduce abstraction doesn't exist in pprocess, but you could roll your
own.

> I have used all of OpenMP, MPI, and Occam in the past. OpenMP adds
> parallelism to programs by the use of special comment strings, MPI by
> explicit calls to library routines, and Occam by explicit syntactical
> structures. Each has its advantages. I like the simplicity of OpenMP,
> the cross-language portability of MPI and the fact the concurrency is
> built in to the Occam language. What I am proposing here is a hybrid
> of the OpenMP and Occam approaches - a change to the language which is
> very natural and yet is easy for programmers to understand.
> Concurrency is generally regarded as the hardest concept for
> programmers to grasp.

It's interesting to hear your experiences on this topic. I still don't
see the need for special syntax; if you were to propose more pervasive
changes, like arbitrary evaluation ordering for function arguments or
the ability to prevent/detect side-effects, the motivation would be
clearer, I think.

Paul


From swellfr at googlemail.com  Mon May 18 17:38:53 2009
From: swellfr at googlemail.com (swellfr at googlemail.com)
Date: Mon, 18 May 2009 14:38:53 -0700 (PDT)
Subject: urllib and keep-alive header
Message-ID: <0c3a37a9-e8fc-400d-ae7f-7a70a16d770c@e23g2000vbe.googlegroups.com>

I would like to know if it is possible to create a connection to a web
server that keeps the underlying socket alive ( Connection : Keep-
Alive header in the HTTP request ) between request ( and can also be
closed on request )

Can someone provide me a small example showing it.


Thx


From ben+python at benfinney.id.au  Mon May 18 17:39:57 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Tue, 19 May 2009 07:39:57 +1000
Subject: Context manager, atexit processing,
	and PEP 3143 	DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>
	<87hbzk8eoh.fsf@benfinney.id.au>
	<ab4fa3490905181014v11bb0746p2f81f3a00dac9b8a@mail.gmail.com>
	<mailman.343.1242668632.8015.python-list@python.org>
Message-ID: <87my9a6qfm.fsf@benfinney.id.au>

MRAB <google at mrabarnett.plus.com> writes:

> Gunter Henriksen wrote:
> > If there is a function which triggers a one-shot switch, I like to
> > have a way to find out if it has already been triggered, I prefer to
> > have the function tell me if it triggered the switch or not, but I
> > would not want that to be by raising an exception.
> 
> The 'file' class also has a 'closed' method, so that's a good model to
> follow.

Yes, I find that convincing as well. (I might prefer it to instead
answer the question ?is it currently open??, i.e. an ?opened? query,
but that makes for more awkward English than ?closed?.)

-- 
 \           ?Are you thinking what I'm thinking, Pinky?? ?Uh... yeah, |
  `\     Brain, but where are we going to find rubber pants our size?? |
_o__)                                           ?_Pinky and The Brain_ |
Ben Finney


From dstanek at dstanek.com  Mon May 18 17:46:21 2009
From: dstanek at dstanek.com (David Stanek)
Date: Mon, 18 May 2009 17:46:21 -0400
Subject: Python code-bloat tool-- warning n00b stuff...
In-Reply-To: <147293.52806.qm@web31807.mail.mud.yahoo.com>
References: <1a3a139e0905161013p2ff1c024l260ad57433e1be20@mail.gmail.com>
	<gung8f$q2s$1@ger.gmane.org>
	<147293.52806.qm@web31807.mail.mud.yahoo.com>
Message-ID: <de32cc030905181446w5edcff27ta07402256a350dcf@mail.gmail.com>

On Mon, May 18, 2009 at 12:45 PM, david wright
>
> I would suggest looking into TDD (test driven development).
>
> This technique would be a good fit to eliminate you feeling of code bloat, in TDD you only write the necessary amount
> of code to make your test pass, hence you never write code that is not going to be utilized.
>
> It takes a little while to get used to this technique ( also, it can be much more difficult to apply in some situations) but it's well worth the effort. :). You'll have no trouble finding tons of resources for this topic.

TDD does help cut down on code bloat, but not because you are only
coding what will actually be used. Rather because of rule #3:
 1. Red - write just enough test code to make a test fail
 2. Green - write just enough production code to make the test pass
 3. Refactor - mercilessly reduce duplication
 4. Repeat

-- 
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek


From emile at fenx.com  Mon May 18 17:53:54 2009
From: emile at fenx.com (Emile van Sebille)
Date: Mon, 18 May 2009 14:53:54 -0700
Subject: Which C compiler?
In-Reply-To: <1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>	<4a11092f$0$30903$9b622d9e@news.freenet.de>
	<1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>
Message-ID: <gusl9q$shg$1@ger.gmane.org>

On 5/18/2009 1:27 PM Jive Dadson said...
> 
> I love Python, but the update regimen is very frustrating.  It's a 
> misery to me why every major release requires new versions of so much 
> application stuff.  No other software that I use is like that.  When I 
> upgrade Windoze, I do not have to get new matching versions of all my 
> editors, browsers, and whatnot.  But Python makes me do that, and that's 
> why I am stuck on release 2.4.  Even the pure Python stuff needs to be 
> copied from one "site-packages" to another.  Then I have to figure out 
> why it won't work.  I have fought my way through the upgrade path twice, 
> and I just can't face it again.
> 
> Thus endeth the rant.

Hmm.. I support python versions ranging from 1.52 though 2.6 on some 
40-50 production systems and don't have an issue with upgrades.  First, 
once I stabilize a production system it doesn't get upgrades anymore 
unless the machine breaks or the application specs change to the point 
where upgrade is better than maintaining.  Second, when setting up a new 
system I always start with the freshest versions of things (barring 
python 3.x which I haven't yet put in a production environment).

Upgrading because newer is available has been a problem as long as 
upgrades have been available.  Just this month some system snuck by me 
with windows update enabled only to have microsofts auto-update break 
the applications.

Just say no to updates...

Emile




From DustanGroups at gmail.com  Mon May 18 18:31:07 2009
From: DustanGroups at gmail.com (Dustan)
Date: Mon, 18 May 2009 15:31:07 -0700 (PDT)
Subject: Photoimage on button appears pixelated when button is disabled
References: <fb96adf5-28cd-4493-8070-993f30f1d78e@v4g2000vba.googlegroups.com>
	<a0be872b-ebff-4541-b22f-361409f56af4@l28g2000vba.googlegroups.com> 
	<mailman.285.1242569465.8015.python-list@python.org>
Message-ID: <a806c6e7-8ac7-4d93-b218-a1efb92a269c@n8g2000vbb.googlegroups.com>

On May 17, 7:11?am, Tim Golden <m... at timgolden.me.uk> wrote:
> Dustan wrote:
> > On May 15, 2:59 pm, Dustan <DustanGro... at gmail.com> wrote:
> >> In tkinter, when I place a photoimage on a button and disable the
> >> button, the image has background dots scattered through the image.
> >> Searching the web, I wasn't able to find any documentation on this
> >> behavior, nor how to turn it off. So here I am. How do I keep this
> >> from happening?
>
> >> Also, how can I extract the base-64 encoding of a GIF, so I can put
> >> the image directly into the code instead of having to keep a separate
> >> file for the image?
>
> >> All responses appreciated,
> >> Dustan
>
> > At the very least, someone ought to be able to provide an answer to
> > the second question.
>
> Well I know nothing about Tkinter, but to do base64 encoding,
> you want to look at the base64 module.
>
> TJG

Thanks.

And for my former question, I worked something out, figuring there
must be no solution.


From norseman at hughes.net  Mon May 18 18:47:41 2009
From: norseman at hughes.net (norseman)
Date: Mon, 18 May 2009 15:47:41 -0700
Subject: Which C compiler?
In-Reply-To: <1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>	<4a11092f$0$30903$9b622d9e@news.freenet.de>
	<1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>
Message-ID: <4A11E58D.7030208@hughes.net>

Jive Dadson wrote:
> Martin v. L?wis wrote:
>> Jive Dadson wrote:
>>> I am using Python 2.4.  I need to make a native Python extension for
>>> Windows XP.  I have both VC++ 6.0 and Visual C++ 2005 Express Edition.
>>> Will VC++ 6.0 do the trick?  That would be easier for me, because the
>>> project is written for that one.  If not, will the 2005 compiler do it?
>>
>> In general, to build extension modules, you need to use the same VC
>> version as the one that was used to build Python. For 2.4, that would
>> be Visual Studio 2003. So if you use VC 6, VS 2005, or VS 2008, you
>> may run into problems.
>>
>> Depending on what exactly the extension module does, it might work
>> fine also.
>>
>> Regards,
>> Martin
> 
> Thanks.  I think I might just use some variety of Popen instead.  I 
> don't need much communication between the C++ application and Python, 
> and it's not time-critical.  I cannot get flush() to work on the Python 
> side of the pipe however I try.  That seems to be a common complaint. 
> But I can work around it.
> 
> I love Python, but the update regimen is very frustrating.  It's a 
> misery to me why every major release requires new versions of so much 
> application stuff.  No other software that I use is like that.  When I 
> upgrade Windoze, I do not have to get new matching versions of all my 
> editors, browsers, and whatnot.  But Python makes me do that, and that's 
> why I am stuck on release 2.4.  Even the pure Python stuff needs to be 
> copied from one "site-packages" to another.  Then I have to figure out 
> why it won't work.  I have fought my way through the upgrade path twice, 
> and I just can't face it again.
> 
> Thus endeth the rant.
==============================
I suspect that if all python users were in the same room and the 
question "Are you NOT happy with python's upgrade requirements?" was 
asked you would find most hands in the air.  I have said it before - the 
current attitude of 'new means we start over' was what nearly destroyed 
Apple. Doesn't take joe public long to get tired of constantly 
re-buying, re-writing themselves, re-hiring the same people to re-write 
the same thing, etc... Most people who do programming are not for hire. 
They are the ones that write for their discipline to make their routine 
chores easier and less typo/error prone and thus (hopefully) have more 
take home money with less effort at the end of the day.  I bump heads 
with version problems daily and it does not make me happy either.  Can 
anyone give a valid excuse for not having a "new version" widget getting 
a new name?  Say os25.popen  os26.popen  os30.popen
                  pylib25     pylib26     pylib30
Sorry, but "Because we had to change (...) to make it work with (...)" 
is NOT a valid excuse for ripping the whole thing apart. At the end of 
the day (the program run), the data is still the data. It probably is 
still going to the same form it's always been converted into. The form 
that the boo-koo dollars proprietary package demands.  In short, while 
Python is a good idea and can do a great job acting standalone in some 
cases and as well as the glue between things, it is not an end unto 
itself.  It's just another tool.  Tools that keep breaking get tossed 
into the trash can and the vendor that makes them gets bad mouthed to 
everyone who will listen.
That is reality.



Steve


From norseman at hughes.net  Mon May 18 19:06:54 2009
From: norseman at hughes.net (norseman)
Date: Mon, 18 May 2009 16:06:54 -0700
Subject: Which C compiler?
In-Reply-To: <gusl9q$shg$1@ger.gmane.org>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>	<4a11092f$0$30903$9b622d9e@news.freenet.de>	<1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>
	<gusl9q$shg$1@ger.gmane.org>
Message-ID: <4A11EA0E.4050103@hughes.net>

Emile van Sebille wrote:
> On 5/18/2009 1:27 PM Jive Dadson said...
>>
>> I love Python, but the update regimen is very frustrating.  It's a 
>> misery to me why every major release requires new versions of so much 
>> application stuff.  No other software that I use is like that.  When I 
>> upgrade Windoze, I do not have to get new matching versions of all my 
>> editors, browsers, and whatnot.  But Python makes me do that, and 
>> that's why I am stuck on release 2.4.  Even the pure Python stuff 
>> needs to be copied from one "site-packages" to another.  Then I have 
>> to figure out why it won't work.  I have fought my way through the 
>> upgrade path twice, and I just can't face it again.
>>
>> Thus endeth the rant.
> 
> Hmm.. I support python versions ranging from 1.52 though 2.6 on some 
> 40-50 production systems and don't have an issue with upgrades.  First, 
> once I stabilize a production system it doesn't get upgrades anymore 

this is where the guy chides: cheat, cheat :)   see below

> unless the machine breaks or the application specs change to the point 
> where upgrade is better than maintaining.  Second, when setting up a new 
> system I always start with the freshest versions of things (barring 
> python 3.x which I haven't yet put in a production environment).
> 
> Upgrading because newer is available has been a problem as long as 
> upgrades have been available.  Just this month some system snuck by me 
> with windows update enabled only to have microsofts auto-update break 
> the applications.
> 
> Just say no to updates...
> 

Welcome to the club!

> Emile
> 
> 

You-all have a great day now! - ya here?

Steve


From sjmachin at lexicon.net  Mon May 18 19:29:38 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 18 May 2009 16:29:38 -0700 (PDT)
Subject: How can i use Spread Sheet as Data Store
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com> 
	<mailman.345.1242673985.8015.python-list@python.org>
Message-ID: <4e44e2f8-6aad-44b8-8b0b-a750683df57e@c18g2000prh.googlegroups.com>

On May 19, 5:12?am, Terry Reedy <tjre... at udel.edu> wrote:
> Kalyan Chakravarthy wrote:
> > Hi All,
> > ? ? ? ? ? ? ?I have data in Spread Sheet ( First Name and Last Name),
> > how can i see ?this data ?in Python code ( how can i use Spread Sheet as
> > Data Store ) .
>
> I you have a choice, a plain text file is MUCH easier.

for line in open('guff.txt'):
    first, last = line.rstrip('\n').split('\t')

> Or, you can output a plain text data.csv (comma-separated variable) file
> from the spreadsheet and read that with the csv module.

import csv
for row in csv.reader(open('guff.csv', 'rb')):
    first, last = row

Or, if you have an Excel XLS file, use xlrd:

import xlrd
book = xlrd.open_workbook('guff.xls')
sheet = book.sheet_by_index(0)
for rowx in xrange(sheet.nrows):
    first, last = sheet.row_values(rowx)

So far I don't see "MUCH" easier ... than what? Perhaps much easier
than using odfpy, which states right up front """Odfpy aims to be a
complete API for OpenDocument in Python. Unlike other more convenient
APIs, this one is essentially an abstraction layer just above the XML
format.""" Perhaps much easier than using COM?


From steve at REMOVE-THIS-cybersource.com.au  Mon May 18 19:32:56 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 18 May 2009 23:32:56 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
Message-ID: <0221e31a$0$20621$c3e8da3@news.astraweb.com>

On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:

> However I *do* actually want to add syntax to the language. I think that
> 'par' makes sense as an official Python construct - we already have had
> this in the Occam programming language for twenty-five years. The reason
> for this is ease of use. I would like to make it easy for amateur
> programmers to exploit natural parallelism in their algorithms. For
> instance somebody who wishes to calculate a property of each member from
> a list of chemical structures using the Python Daylight interface: with
> my suggestion they could potentially get a massive speed up just by
> changing 'for' to 'par' or 'map' to 'pmap'. (Or map with a parallel
> keyword argument set as suggested). At present they would have to
> manually chop up their work and run it as multiple processes in order to
> achieve the same - fine for expert programmers but not reasonable for
> people working in other domains who wish to use Python as a utility
> because of its fantastic productivity and ease of use.

There seems to be some discrepancy between this, and what you wrote in 
your first post:

"There would be no locking and it would be the programmer's 
responsibility to ensure that the loop was truly parallel and correct."

So on the one hand, you want par to be utterly simple-minded and to do no 
locking. On the other hand you want it so simple to use that amateurs can 
mechanically replace 'for' with 'par' in their code and everything will 
Just Work, no effort or thought required. But those two desires are 
inconsistent.

Concurrency is an inherently complicated problem: deadlocks and race 
conditions abound, and are notoriously hard to reproduce, let alone 
debug. If par is simple, and does no locking, then the programmer needs 
to worry about those complications. If you want programmers to ignore 
those complications, either (1) par needs to be very complicated and 
smart, to do the Right Thing in every case, or (2) you're satisfied if 
par produces buggy code when used in the fashion you recommend.

The third option is, make par really simple and put responsibility on the 
user to write code which is concurrent. I think that's the right 
solution, but it means a simplistic "replace `for` with `par` and your 
code will run faster" will not work. It might run faster three times out 
of five, but the other two times it will hang in a deadlock, or produce 
incorrect results, or both.



-- 
Steven


From bluefisher80 at gmail.com  Mon May 18 20:37:58 2009
From: bluefisher80 at gmail.com (Jim Qiu)
Date: Tue, 19 May 2009 08:37:58 +0800
Subject: A newbie question about some code
In-Reply-To: <op.ut4cops9a8ncjz@gnudebst>
References: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
	<op.ut4cops9a8ncjz@gnudebst>
Message-ID: <b42c5a480905181737r78def19av42c01fc374bf2d22@mail.gmail.com>

On Mon, May 18, 2009 at 5:30 PM, Rhodri James
<rhodri at wildebst.demon.co.uk>wrote:

> On Mon, 18 May 2009 10:18:52 +0100, Jim Qiu <bluefisher80 at gmail.com>
> wrote:
>
>  Please check the blue highlighted part,  I don't understand how the object
>> get the property?
>>
>
> Colours and highlighting don't come across in Usenet postings.  Could
> you be a bit more specific.  Which object, and what property?
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list


It's the out property. and I realized my mistake after reading  Chris
Rebert's Message.

Thanks.

Jim
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From JackTradesPublic at gmail.com  Mon May 18 21:03:01 2009
From: JackTradesPublic at gmail.com (Jack Trades)
Date: Mon, 18 May 2009 18:03:01 -0700 (PDT)
Subject: Subversion commit from Python?
Message-ID: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>

I'm wondering if there's an easy way to do a 'svn commit' on a
directory from Python.

More Details:
I have a wiki-like program that stores its data in a directory that I
would like to put under version control to be able to roll back
unwanted changes.  The program is stored in two directories, a 'cgi'
directory which displays the data and allows user editing and a 'data'
directory.  The 'data' directory is a checked-out version of the
repository.
Originally I had the 'data' directory in the same directory as the cgi
scripts and was using os.system("svn commit"), however I kept running
into weird bugs with this method.  So I moved the data directory out
of the cgi directory and plan to use a separate repository.  So is
there a prefered way to commit this directory to a subversion
repository from a Python script?


From pavlovevidence at gmail.com  Mon May 18 22:31:06 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 18 May 2009 19:31:06 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com> 
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com>
Message-ID: <a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com>

On May 18, 1:52?pm, jer... at martinfamily.freeserve.co.uk wrote:
> As I understand it the reason for the GIL is to prevent problems with
> garbage collection in multi-threaded applications.

Not really.  It's main purpose to prevent context switches from
happening in the middle of some C code (essentially it makes all C
code a "critical" section, except when the C code explicitly releases
the GIL).  This tremendously simplifies the task of writing extension
modules, not to mention the Python core.


> Without it the
> reference count method is prone to race conditions. However it seems
> like a fairly crude mechanism to solve this problem. Individual
> semaphores could be used for each object reference counter, as in
> Java.

Java doesn't use reference counting.

Individual locks on the refcounts would be prohibitively expensive in
Python, a cost that Java doesn't have.

Even if you decided to accept the penalty and add locking to
refcounts, you still have to be prepared for context switching at any
time when writing C code, which means in practice you have to lock any
object that's being accessed--that's in addition to the refcount lock.

I am not disagreeing with your assessment in general, it would be
great if Python were better able to take advantage of multiple cores,
but it's not as simple a thing as you're making it out to be.


Carl Banks


From hunteroakesgun at gmail.com  Mon May 18 22:36:44 2009
From: hunteroakesgun at gmail.com (hunteroakesgun at gmail.com)
Date: Mon, 18 May 2009 19:36:44 -0700 (PDT)
Subject: identifying live hosts on a network
Message-ID: <069f821d-1b73-4ed9-b298-09e7c0548122@p6g2000pre.googlegroups.com>

HI
I am new to python and am having trouble coming up with a script that
idenifies all the live hosts on my network.
thanks Hunter


From ronggui.huang at gmail.com  Mon May 18 23:45:31 2009
From: ronggui.huang at gmail.com (Wincent)
Date: Mon, 18 May 2009 20:45:31 -0700 (PDT)
Subject: How can i use Spread Sheet as Data Store
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com> 
	<mailman.345.1242673985.8015.python-list@python.org>
	<4e44e2f8-6aad-44b8-8b0b-a750683df57e@c18g2000prh.googlegroups.com>
Message-ID: <60224e58-8241-4ec1-a6b5-6027a73164af@z16g2000prd.googlegroups.com>

If you want to write to a csv file, the other option is savetxt in
NumPy module.

Best

On May 19, 7:29?am, John Machin <sjmac... at lexicon.net> wrote:
> On May 19, 5:12?am, Terry Reedy <tjre... at udel.edu> wrote:
>
> > Kalyan Chakravarthy wrote:
> > > Hi All,
> > > ? ? ? ? ? ? ?I have data in Spread Sheet ( First Name and Last Name),
> > > how can i see ?this data ?in Python code ( how can i use Spread Sheet as
> > > Data Store ) .
>
> > I you have a choice, a plain text file is MUCH easier.
>
> for line in open('guff.txt'):
> ? ? first, last = line.rstrip('\n').split('\t')
>
> > Or, you can output a plain text data.csv (comma-separated variable) file
> > from the spreadsheet and read that with the csv module.
>
> import csv
> for row in csv.reader(open('guff.csv', 'rb')):
> ? ? first, last = row
>
> Or, if you have an Excel XLS file, use xlrd:
>
> import xlrd
> book = xlrd.open_workbook('guff.xls')
> sheet = book.sheet_by_index(0)
> for rowx in xrange(sheet.nrows):
> ? ? first, last = sheet.row_values(rowx)
>
> So far I don't see "MUCH" easier ... than what? Perhaps much easier
> than using odfpy, which states right up front """Odfpy aims to be a
> complete API for OpenDocument in Python. Unlike other more convenient
> APIs, this one is essentially an abstraction layer just above the XML
> format.""" Perhaps much easier than using COM?



From cournape at gmail.com  Tue May 19 00:15:14 2009
From: cournape at gmail.com (David Cournapeau)
Date: Tue, 19 May 2009 13:15:14 +0900
Subject: Package problem
In-Reply-To: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
Message-ID: <5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>

On Tue, May 19, 2009 at 4:52 AM, Sverre <sverreodegard at gmail.com> wrote:
> I'm using Ubuntu and some of the packages in the repository are too
> old. So I got the thought to remove nearly ?all packages downloaded
> from the repository and install them with easy_install. Is this a way
> to go without greater problems?

This is probably the worst way to do it :)

As a rule, you should never install anything from sources (be it
python packages or anything else) in /usr, which should be considered
as 'owned' by the package. By /usr is owned, I mean that anything
installed with prefix /usr (/usr/lib, /usr/include, etc...) can be
overwritten by the Ubuntu package manager. Unfortunately, by default,
python setup.py install will install in /usr (whereas most sources
packages installed in /usr/local/ if no --prefix is given - that's the
case of any software using autoconf, like python for example).

You could either install system-wide (for all users) in /usr/local, or
somewhere just for yourself. To handle dependencies, you could use
something like virtualenv for packages using autotools. For
development, a more heavy-weight (but more reliable) method is to use
chroot and other 'jail-like' systems.

You should avoid building by yourself things which depend on a lot of
C libraries - it quickly becomes unmanageable in my own experience.
For some distributions which have long release periods (e.g. RHEL),
that's a significant problem without any easy solution (I almost
always use a virtual machine in that case if possible).

cheers,

David


From cournape at gmail.com  Tue May 19 00:16:19 2009
From: cournape at gmail.com (David Cournapeau)
Date: Tue, 19 May 2009 13:16:19 +0900
Subject: Package problem
In-Reply-To: <5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
Message-ID: <5b8d13220905182116h301cf355j4de9425c09eca291@mail.gmail.com>

On Tue, May 19, 2009 at 1:15 PM, David Cournapeau <cournape at gmail.com> wrote:

> something like virtualenv for packages using autotools.

   ^^^^^^^
Sorry, I meant setuptools here, not autotools

David


From davea at ieee.org  Tue May 19 00:22:42 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 19 May 2009 00:22:42 -0400
Subject: A newbie question about some code
In-Reply-To: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
References: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
Message-ID: <4A123412.40702@ieee.org>

Jim Qiu wrote:
> Hi everyone.
> I am reading a python library code and found something i can not understand.
> Please help!
>
> class Envelope(object):
>
>     def __init__(self,ta_info):
>         self.ta_info = ta_info
>
>
>     def writefilelist(self,ta_list,tofile):
>         for filename in ta_list:
>             fromfile = botslib.botsopendata(filename,
> 'rb',self.ta_info['charset'])
>             shutil.copyfileobj(fromfile,tofile)
>             fromfile.close()
>
>     def convertfilelist(self,ta_list):
>         return [botslib.botsgetabspathdata(filename) for filename in
> ta_list]
>
>
>
> class myxmlenvelop(Envelope):
>     def __init__(self,ta_info,ta_list):
>         ''' class for (test) xml envelope. There is no standardised
> XML-envelope!
>             writes a new XML-tree; uses places-holders for XML-files to
> include; real enveloping is done by ElementTree's include'''
>         self.ta_info = ta_info
>         self._openoutenvelope()
>         #~ self.out.put({'BOTSID':'root','xmlns:xi':"
> http://www.w3.org/2001/XInclude"})     #works, but attribute is not removed
> bij ETI.include
>         self.out.put({'BOTSID':'root'})
>         ta_list = self.convertfilelist(ta_list)
>         for filename in ta_list:
>             self.out.put({'BOTSID':'root'},{'BOTSID':'{
> http://www.w3.org/2001/XInclude}include','parse':"xml",'href':filename})
>         self.out.envelopewrite(self.out.root
>
>
> Please check the blue highlighted part,  I don't understand how the object
> get the property?
>
>
> Jim
>
>   
Now that you tell us you want to know where the out property is coming 
from, I can respond.

Clearly, you don't have the whole class listed here.  Where's the 
_openoutenvelop() method, for example?   I'd guess it creates the out 
attribute.  Since it gets called from __init__(), and before the 
reference to self.out, that's what makes the most sense.




From ldo at geek-central.gen.new_zealand  Tue May 19 00:26:23 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 19 May 2009 16:26:23 +1200
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
Message-ID: <gutcdg$3st$4@lust.ihug.co.nz>

In message <2904e7de-0a8d-4697-9c44-
c83bb5319de4 at s31g2000vbp.googlegroups.com>, Jack Trades wrote:

> Originally I had the 'data' directory in the same directory as the cgi
> scripts and was using os.system("svn commit"), however I kept running
> into weird bugs with this method.

What bugs?



From jeff at jmcneil.net  Tue May 19 00:30:26 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Mon, 18 May 2009 21:30:26 -0700 (PDT)
Subject: How can i use Spread Sheet as Data Store
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com> 
	<mailman.345.1242673985.8015.python-list@python.org>
	<4e44e2f8-6aad-44b8-8b0b-a750683df57e@c18g2000prh.googlegroups.com>
	<60224e58-8241-4ec1-a6b5-6027a73164af@z16g2000prd.googlegroups.com>
Message-ID: <8c37da7c-c0ba-4b45-8257-18a29629aafd@l28g2000vba.googlegroups.com>

On May 18, 11:45?pm, Wincent <ronggui.hu... at gmail.com> wrote:
> If you want to write to a csv file, the other option is savetxt in
> NumPy module.
>
> Best
>
> On May 19, 7:29?am, John Machin <sjmac... at lexicon.net> wrote:
>
> > On May 19, 5:12?am, Terry Reedy <tjre... at udel.edu> wrote:
>
> > > Kalyan Chakravarthy wrote:
> > > > Hi All,
> > > > ? ? ? ? ? ? ?I have data in Spread Sheet ( First Name and Last Name),
> > > > how can i see ?this data ?in Python code ( how can i use Spread Sheet as
> > > > Data Store ) .
>
> > > I you have a choice, a plain text file is MUCH easier.
>
> > for line in open('guff.txt'):
> > ? ? first, last = line.rstrip('\n').split('\t')
>
> > > Or, you can output a plain text data.csv (comma-separated variable) file
> > > from the spreadsheet and read that with the csv module.
>
> > import csv
> > for row in csv.reader(open('guff.csv', 'rb')):
> > ? ? first, last = row
>
> > Or, if you have an Excel XLS file, use xlrd:
>
> > import xlrd
> > book = xlrd.open_workbook('guff.xls')
> > sheet = book.sheet_by_index(0)
> > for rowx in xrange(sheet.nrows):
> > ? ? first, last = sheet.row_values(rowx)
>
> > So far I don't see "MUCH" easier ... than what? Perhaps much easier
> > than using odfpy, which states right up front """Odfpy aims to be a
> > complete API for OpenDocument in Python. Unlike other more convenient
> > APIs, this one is essentially an abstraction layer just above the XML
> > format.""" Perhaps much easier than using COM?

I didn't see it mentioned yet, but the Google Spreadsheet application
is also something you could use if you have a choice. It has a fairly
useful API that let's you manage elements. I'm not sure if it's an
option for you or not.

http://code.google.com/apis/spreadsheets/overview.html

Thanks,

Jeff
mcjeff.blogspot.com


From david.lyon at preisshare.net  Tue May 19 00:31:57 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 19 May 2009 00:31:57 -0400
Subject: Package problem
In-Reply-To: <5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
Message-ID: <39468261f5a617fdea45101268b7be6c@preisshare.net>


Hi David,

I guess paraphrased you are saying "don't touch your packages"..

To my point of view, the needs of the developer override the
priorities of the O/S house...

We should expect "old" packages on our systems from the O/S

and have an easier way to update them to whatever we want..

That's why imho, we can benefit with a package manager tool
that can do just that. I just don't have anything running
on ubuntu just yet - sadly.

On Tue, 19 May 2009 13:15:14 +0900, David Cournapeau <cournape at gmail.com>
wrote:
> On Tue, May 19, 2009 at 4:52 AM, Sverre <sverreodegard at gmail.com> wrote:
>> I'm using Ubuntu and some of the packages in the repository are too
>> old. So I got the thought to remove nearly  all packages downloaded
>> from the repository and install them with easy_install. Is this a way
>> to go without greater problems?
> 
> This is probably the worst way to do it :)
> 
> As a rule, you should never install anything from sources (be it
> python packages or anything else) in /usr, which should be considered
> as 'owned' by the package. By /usr is owned, I mean that anything
> installed with prefix /usr (/usr/lib, /usr/include, etc...) can be
> overwritten by the Ubuntu package manager. Unfortunately, by default,
> python setup.py install will install in /usr (whereas most sources
> packages installed in /usr/local/ if no --prefix is given - that's the
> case of any software using autoconf, like python for example).
> 
> You could either install system-wide (for all users) in /usr/local, or
> somewhere just for yourself. To handle dependencies, you could use
> something like virtualenv for packages using autotools. For
> development, a more heavy-weight (but more reliable) method is to use
> chroot and other 'jail-like' systems.
> 
> You should avoid building by yourself things which depend on a lot of
> C libraries - it quickly becomes unmanageable in my own experience.
> For some distributions which have long release periods (e.g. RHEL),
> that's a significant problem without any easy solution (I almost
> always use a virtual machine in that case if possible).
> 
> cheers,
> 
> David


From ldo at geek-central.gen.new_zealand  Tue May 19 00:34:13 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 19 May 2009 16:34:13 +1200
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
Message-ID: <gutcs6$47g$1@lust.ihug.co.nz>

In message <mff7e6-e43.ln1 at satorlaser.homedns.org>, Ulrich Eckhardt wrote:

> If you took a look at Java, you
> would notice that the core language syntax is much simpler than Python's.

I don't think it is. Look at things like "private" versus "protected" versus 
"public" with or without "static" and "final", "class" versus "interface", 
what "new" means, and all the predefined types being reserved words, 
including of course the concept of "void", special syntax for defining array 
types, and typecasting -- these are all things that Python manages to do 
without.

And that's not even counting newer language features added since the last 
time I did any Java programming.



From gokhansever at gmail.com  Tue May 19 00:35:04 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Mon, 18 May 2009 23:35:04 -0500
Subject: Question about locals()
Message-ID: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>

Hello,

Could you please explain why locals() allow me to create variables that are
not legal in Python syntax. Example: locals()['1abc'] = 55. Calling of 1abc
results with a syntax error. Shouldn't it be better to raise an error during
the variable creation time?

Thank you

G?khan
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From ldo at geek-central.gen.new_zealand  Tue May 19 00:35:39 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 19 May 2009 16:35:39 +1200
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
Message-ID: <gutcur$47g$2@lust.ihug.co.nz>

In message <07e5af6c-d41d-4a4a-8e2e-
f27bc92c96e5 at f16g2000vbf.googlegroups.com>, Steve Ferg wrote:

> On the one hand, there are developers who love big IDEs with lots of
> features (code generation, error checking, etc.), and rely on them to
> provide the high level of support needed to be reasonably productive
> in heavy-weight languages (e.g. Java).
> 
> On the other hand there are developers who much prefer to keep things
> light-weight and simple.

Would it be fair to say the first type tends to congregate in herds, 
particularly in corporate IT departments, while the latter tends to operate 
on a more individual basis?



From cournape at gmail.com  Tue May 19 00:53:18 2009
From: cournape at gmail.com (David Cournapeau)
Date: Tue, 19 May 2009 13:53:18 +0900
Subject: Package problem
In-Reply-To: <39468261f5a617fdea45101268b7be6c@preisshare.net>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
	<39468261f5a617fdea45101268b7be6c@preisshare.net>
Message-ID: <5b8d13220905182153j490f4826kf2b21422de901210@mail.gmail.com>

On Tue, May 19, 2009 at 1:31 PM, David Lyon <david.lyon at preisshare.net> wrote:
>
> Hi David,
>
> I guess paraphrased you are saying "don't touch your packages"..
>
> To my point of view, the needs of the developer override the
> priorities of the O/S house...
>
> We should expect "old" packages on our systems from the O/S
>
> and have an easier way to update them to whatever we want..
>
> That's why imho, we can benefit with a package manager tool
> that can do just that. I just don't have anything running
> on ubuntu just yet - sadly.

Given that nobody has managed to solve this problem, I doubt you will
find a solution. If there was a reasonable solution, it would have
already been developed. Solutions for developers include independent
environments, avoiding dependencies as much as possible, and
controlling everything by yourself. Trying to fight the OS deployment
system is thinking backward IMHO.

cheers,

David


From kalyanchakravarthy at hyit.com  Tue May 19 01:21:57 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Tue, 19 May 2009 10:51:57 +0530
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <loom.20090518T151856-387@post.gmane.org>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
	<loom.20090518T151856-387@post.gmane.org>
Message-ID: <8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com>

Hi John
             I am using  Google Spread Sheet with 20 rows of data ,
            OS is  Windows XP
            Python2.6

Actually my requirement is
in an web application when user enters User name and Password,
back end i needs to check, is it they entered correct user name with
password ( here i want to read the Spread Sheet Data in Python code  ),
for this i will keep all the user names and passwords in Google Spread Sheet

now tell me how can i read Spread Sheet data in Python

Reply me

Regards
Kalyan





On Mon, May 18, 2009 at 8:56 PM, John Machin <sjmachin at lexicon.net> wrote:

> Kalyan Chakravarthy <kalyanchakravarthy <at> hyit.com> writes:
>
> >
> > Hi All,             I have data in Spread Sheet ( First Name and Last
> Name),
> how can i see  this data  in Python code ( how can i use Spread Sheet as
> Data
> Store ) . -- RegardsKalyan
>
> Hi Kalyan,
>
> A few questions ... the answers might help us help you better:
>
> What type of spreadsheet do you have:
> .ods (produced by OpenOffice.org's calc)?
> .gnumeric?
> .xls (MS Excel 2003)?
> .xlsx (MS Excel 2007)?
> something else?
>
> Do you want to update the spreadsheet using Python, or will that be done
> manually? How many rows of data are you likely to have?
>
> What version of Python do you plan to use?
>
> What OS are you using?
>
> Cheers,
> John
>
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Regards
Kalyan
Mobile no: +91 9985351220
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From mail at johnohagan.com  Tue May 19 01:27:17 2009
From: mail at johnohagan.com (John O'Hagan)
Date: Tue, 19 May 2009 05:27:17 +0000
Subject: Question about locals()
In-Reply-To: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
Message-ID: <200905190527.18214.mail@johnohagan.com>

On Tue, 19 May 2009, G?khan SEVER wrote:
> Hello,
>
> Could you please explain why locals() allow me to create variables that are
> not legal in Python syntax. Example: locals()['1abc'] = 55. Calling of 1abc
> results with a syntax error. Shouldn't it be better to raise an error
> during the variable creation time?
>

The docs warn against modifying locals() because for one thing, the 
interpreter may not know about the changes you make. 

You can add any item to the locals() dictionary without causing an error, but 
that doesn't necessarily mean you have created a legal object and named it.

 But admittedly that doesn't actually answer your question. :)

Regards,

John




From david.lyon at preisshare.net  Tue May 19 01:35:32 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 19 May 2009 01:35:32 -0400
Subject: Package problem
In-Reply-To: <5b8d13220905182153j490f4826kf2b21422de901210@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
	<39468261f5a617fdea45101268b7be6c@preisshare.net>
	<5b8d13220905182153j490f4826kf2b21422de901210@mail.gmail.com>
Message-ID: <46d018218eee7332fdf436ed42afdca3@preisshare.net>

On Tue, 19 May 2009 13:53:18 +0900, David Cournapeau <cournape at gmail.com>
wrote:
> Given that nobody has managed to solve this problem, I doubt you will
> find a solution. 

It is solved in other languages.. for example perl.. and delphi

> If there was a reasonable solution, it would have
> already been developed. 

Maybe we are slower because we like to do things "better"

> Trying to fight the OS deployment system is thinking backward IMHO.

Fight it ??? I didn't even get a python interpreter with my operating
system...

So there's no possible way I can be against it...


David




From JackTradesPublic at gmail.com  Tue May 19 01:48:30 2009
From: JackTradesPublic at gmail.com (Jack Trades)
Date: Mon, 18 May 2009 22:48:30 -0700 (PDT)
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<gutcdg$3st$4@lust.ihug.co.nz>
Message-ID: <ac63e27e-2dd9-4c27-ace0-d9e205be7afa@s31g2000vbp.googlegroups.com>

On May 19, 12:26?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <2904e7de-0a8d-4697-9c44-
>
> c83bb5319... at s31g2000vbp.googlegroups.com>, Jack Trades wrote:
> > Originally I had the 'data' directory in the same directory as the cgi
> > scripts and was using os.system("svn commit"), however I kept running
> > into weird bugs with this method.
>
> What bugs?

I'm not 100% sure, but I think it had to do with executable
permissions on the cgi scripts.  I would click on a link in the main
document (named 'add section') and it worked as expected.  After
inserting the information for 'add section' and submitting it (info
was saved in the data folder, then a commit was done on the whole
project), clicking on the same 'add section' link would produce an
error (going back to the 'add section' script asked me to download it
instead of displaying it).

I'm using a very simple server to develop this on my computer...

import BaseHTTPServer
import CGIHTTPServer
import cgitb; cgitb.enable()  ## This line enables CGI error reporting

server = BaseHTTPServer.HTTPServer
handler = CGIHTTPServer.CGIHTTPRequestHandler
server_address = ("", 8000)
handler.cgi_directories = [""]

httpd = server(server_address, handler)
httpd.serve_forever()

I got no information about the error at all, and after some time
completely gave up on it.  I'm only guessing that it was a permissions
problem.  I have made a huge number of modifications to the program
since then (about 2 days ago), and am unable to investigate it
further.  I was just wondering if using os.system('svn commit') was
the right approach, or if there was a "more Pythonic" way of doing
this.


From stefan_ml at behnel.de  Tue May 19 01:50:13 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 19 May 2009 07:50:13 +0200
Subject: Conceptual flaw in pxdom?
In-Reply-To: <cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
Message-ID: <4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>

Paul Boddie wrote:
> On 18 Mai, 08:54, Stefan Behnel wrote:
>> Emanuele D'Arrigo wrote:
>>> I'm looking at pxdom and in particular at its foundation class
>>> DOMObject
>> I didn't know pxdom, but looking at it now I can see that it hasn't been
>> updated since 2006. Not sure if that means that it is complete or that it
>> has been abandoned.
> 
> Maybe the developer is mostly satisfied with it.

Well, hard to tell without asking the author. I'm far from saying that a
"complete" piece of software is a bad thing, but bit-rot is still the death
 of all now-working software.


>> Anyway, seeing that it only provides DOM compliance, without anything
>> further like XPath or whatever, and that it doesn't focus on performance in
>> any way, you might still be better off with ElementTree, which is in the
>> stdlib since Python 2.5 (and available for Py2.2+).
> 
> To put the inquirer's remarks in context, I suggested that he look at
> pxdom specifically as a replacement for minidom and in response to the
> following statement: "I've used etree and lxml successfully before but
> I wanted to understand how close I can get to the W3C DOM standards."
> Maybe you missed that thread, but here's a link to it:
> 
> http://groups.google.com/group/comp.lang.python/browse_frm/thread/d445363b99001ad6

Ah, yes, I missed that thread. I always wonder why people want "DOM
compliance". I don't consider that a value by itself, and I don't see the
advantage that the DOM API has over other XML APIs (which, most of the
time, were designed to make life simpler for DOM suffering developers). I
find it a lot more important to get the stuff working quickly and in a
(somewhat) robust way, which is hard to achieve in DOM code. It's pretty
easy to write unmaintainable code that uses the DOM API, though.

Stefan


From dropbox at a-nugget.de  Tue May 19 01:50:23 2009
From: dropbox at a-nugget.de (Guido Goldstein)
Date: Tue, 19 May 2009 07:50:23 +0200
Subject: UDP reading on multiple sockets
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net>
	<15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>
	<27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
Message-ID: <m2d4a54p5s.fsf@mail.a-nugget.de>


Hi!

On Mon, 18 May 2009 06:19:01 -0700 (PDT)
  thomas.vogel at likeabird.de wrote:
[...]
> The only honest answer would be that I'm totaly unfamiliar with select
> and also the documentation I found wasn't able to clear the picture.
> So are there examples of using select together with sockets available?

If you want to write something related to networks you should know
this book:
  http://www.kohala.com/start/unpv12e.html
Also found at
  http://www.amazon.de/UNIX-Network-Programming-Sockets-Networking/dp/013490012X

MfT
  Guido


From tjreedy at udel.edu  Tue May 19 01:54:03 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 19 May 2009 01:54:03 -0400
Subject: Question about locals()
In-Reply-To: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
Message-ID: <guthhp$nn5$1@ger.gmane.org>

G?khan SEVER wrote:
> Hello,
> 
> Could you please explain why locals() allow me to create variables that 
> are not legal in Python syntax.

It doesn't.

> Example: locals()['1abc'] = 55. Calling 
> of 1abc results with a syntax error.

Within a function, locals() is a persistemt dictionary copy of the local 
namespace.  In that situation, using even a legal name as the key does 
not change the local namespace, and trying to use that legal name will 
give a NameError.

Better to ask about globals(), which *is* the global namespace.

  Shouldn't it be better to raise an
> error during the variable creation time?

To do that would require a separate legal-name-string-only dictionary.
That has been considered, but has not seemed worth the trouble.
Also, people have found uses for what you are calling an error.

Few newbies try to add non-identifiers to locals().  More often, they 
fail to real the red warning about not trying to add even a legal 
identifier.

Terry Jan Reedy



From clp2 at rebertia.com  Tue May 19 02:01:10 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 18 May 2009 23:01:10 -0700
Subject: Seeking old post on developers who like IDEs vs developers who 
	like simple languages
In-Reply-To: <gutcur$47g$2@lust.ihug.co.nz>
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<gutcur$47g$2@lust.ihug.co.nz>
Message-ID: <50697b2c0905182301o137b66bfn6bd5cd4ce1103441@mail.gmail.com>

On Mon, May 18, 2009 at 9:35 PM, Lawrence D'Oliveiro
<ldo at geek-central.gen.new_zealand> wrote:
> In message <07e5af6c-d41d-4a4a-8e2e-
> f27bc92c96e5 at f16g2000vbf.googlegroups.com>, Steve Ferg wrote:
>
>> On the one hand, there are developers who love big IDEs with lots of
>> features (code generation, error checking, etc.), and rely on them to
>> provide the high level of support needed to be reasonably productive
>> in heavy-weight languages (e.g. Java).
>>
>> On the other hand there are developers who much prefer to keep things
>> light-weight and simple.
>
> Would it be fair to say the first type tends to congregate in herds,
> particularly in corporate IT departments, while the latter tends to operate
> on a more individual basis?

That would certainly explain Lisp hackers!
*(ducks)*

Cheers,
Chris
-- 
http://blog.rebertia.com


From steven at REMOVE.THIS.cybersource.com.au  Tue May 19 02:06:23 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 19 May 2009 06:06:23 GMT
Subject: Question about locals()
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
Message-ID: <pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>

Sorry for breaking threading, the original post is not being carried by 
my ISP. 


On Tue, 19 May 2009, G?khan SEVER wrote:
> Hello,
>
> Could you please explain why locals() allow me to create variables that
> are not legal in Python syntax. Example: locals()['1abc'] = 55. Calling
> of 1abc results with a syntax error. Shouldn't it be better to raise an
> error during the variable creation time?

No, because it isn't an error to use '1abc' as a dictionary key.

"locals()['1abc'] = 55" does not create a variable. It creates an object 
55, a string '1abc', and uses that string as the key in a dict with 55 as 
the value.

"locals()['abc'] = 55" does not create a variable either. It does exactly 
the same thing as above, except that in this case 'abc' happens to be a 
valid identifier.

"abc = 55" also does not create a variable. What it does is exactly the 
same as the above, except that the dictionary key is forced to be a valid 
identifier by the parser (or perhaps the lexer): the parser won't accept 
1abc as a valid identifier, so you can't execute "1abc = 55".

(Almost... there's actually a slight complication, namely that making 
changes to locals() inside a function does not work.)

Python's programming model is based on namespaces, and namespaces are 
implemented as dictionaries: so-called "variables" are key/value pairs 
inside a dictionary. Just because a dictionary is used as a namespace 
doesn't stop it from being used as a dictionary: you can add any keys/
values which would otherwise be valid. It's still a dictionary, just like 
any other dictionary.

>>> globals()[45] = None
>>> globals()
{'__builtins__': <module '__builtin__' (built-in)>, 45: None, '__name__': 
'__main__', '__doc__': None}


As for *why* this is done this way, the answer is simplicity of 
implementation. Dictionaries don't need to care about what counts as a 
valid identifier. Only the lexer/parser needs to care.


-- 
Steven


From cournape at gmail.com  Tue May 19 02:45:42 2009
From: cournape at gmail.com (David Cournapeau)
Date: Tue, 19 May 2009 15:45:42 +0900
Subject: Package problem
In-Reply-To: <46d018218eee7332fdf436ed42afdca3@preisshare.net>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
	<39468261f5a617fdea45101268b7be6c@preisshare.net>
	<5b8d13220905182153j490f4826kf2b21422de901210@mail.gmail.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
Message-ID: <5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>

On Tue, May 19, 2009 at 2:35 PM, David Lyon <david.lyon at preisshare.net> wrote:
> On Tue, 19 May 2009 13:53:18 +0900, David Cournapeau <cournape at gmail.com>
> wrote:
>> Given that nobody has managed to solve this problem, I doubt you will
>> find a solution.
>
> It is solved in other languages.. for example perl.. and delphi

I don't know much about perl, and even less about delphi, but I am
pretty sure it does not solve the problem of overwriting files from a
package with an installation outside the control of the package
manager.

There is no simple solution to the following situation:
   - install setuptools from ubuntu -> files get into /usr
(/usr/lib/python2.5/site-packages, etc...)
   - install setuptools from sources into /usr: overwrite files from
the python-setuptools debian package, with an updated version which is
not compatible with the packaged one -> every Ubuntu package depending
on setuptools is now broken. Worse, it may not be possible to rollback
to a working situation.

To make it work, you would have to somehow notify the package
management system about the updated version. But still, the whole
value of a package manager is to have a whole set of packages which
are tested together. Updating packages 'randomly' from 3rd party
sources is inherently against this.

> Fight it ??? I didn't even get a python interpreter with my operating
> system...
>
> So there's no possible way I can be against it...

By fighting, I meant that because OS don't always have uptodate
packages you want to depend on, trying to implement a system to update
the packages is backward. The problem is depending on those recent
libraries in the first place if you want to run on many
configurations.

cheers,

David


From sasurve at gmail.com  Tue May 19 02:51:20 2009
From: sasurve at gmail.com (shruti surve)
Date: Tue, 19 May 2009 12:21:20 +0530
Subject: issue: Permissions in odfpy
Message-ID: <862e00220905182351k3ec16f8dnc7841d7e749ff743@mail.gmail.com>

hey,
i am using odfpy and  generating spreadsheet in open office..but nobody
should modify the file..so can anybody tell me how can we give permissions
(read only) to spreadsheet in odfpy??..i have change the properties of my
normal open office spreadsheet file and made it read only..n also extracted
it..but in conteny.xml also i am not finding any property which can be used
in odfpy...so please give me some solution..


regards
shruti surve
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From henning.vonbargen at arcor.de  Tue May 19 03:11:04 2009
From: henning.vonbargen at arcor.de (henning.vonbargen at arcor.de)
Date: Tue, 19 May 2009 00:11:04 -0700 (PDT)
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
References: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>
	<51d1dd3f-322d-47fa-9d44-75b92c6ef4e2@e20g2000vbc.googlegroups.com> 
	<2003c02c-6a9f-40fb-b19c-30625ed09eb0@s21g2000vbb.googlegroups.com>
Message-ID: <fc58e391-7979-4220-b6c9-a06c23ee4dbb@21g2000vbk.googlegroups.com>

Daniel:
> What do you get with:
> import thread
> thread.start_new_thread(int, ('1',2))
>

This results in the same error message:
thread.error: can't start new thread

Aahz:
> You probably want to start by figuring out which threading library is
> being used -- Python normally wants Posix threads, but IIRC, that's not
> the default on HP-UX, and you may need to fix the build process to use
> Posix.

You're probably right, but I'm lost here, since I'm neither a *nix nor
a HP-UX expert in building software from source. I'm used to
"configure; make; make install", which usually works well on other
platforms...

Henning


From dstanek at dstanek.com  Tue May 19 03:32:01 2009
From: dstanek at dstanek.com (David Stanek)
Date: Tue, 19 May 2009 03:32:01 -0400
Subject: strip char from list of strings
In-Reply-To: <195055.64779.qm@web54204.mail.re2.yahoo.com>
References: <195055.64779.qm@web54204.mail.re2.yahoo.com>
Message-ID: <de32cc030905190032o3e392314o9ee2944f9d99255a@mail.gmail.com>

On Mon, May 18, 2009 at 3:30 PM, Laurent Luce <laurentluce49 at yahoo.com> wrote:
>
> I have the following list:
>
> [ 'test\n', test2\n', 'test3\n' ]
>
> I want to remove the '\n' from each string in place, what is the most efficient way to do that ?
>

What have you tried so far?

-- 
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek


From mail at timgolden.me.uk  Tue May 19 03:37:44 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 19 May 2009 08:37:44 +0100
Subject: Subversion commit from Python?
In-Reply-To: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
Message-ID: <4A1261C8.1000707@timgolden.me.uk>

Jack Trades wrote:
> I'm wondering if there's an easy way to do a 'svn commit' on a
> directory from Python.
> 

  http://pysvn.tigris.org/

and in particular:

  http://pysvn.tigris.org/docs/pysvn_prog_guide.html

TJG


From duncan.booth at invalid.invalid  Tue May 19 03:46:42 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 19 May 2009 07:46:42 GMT
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
Message-ID: <Xns9C1058657406Dduncanbooth@127.0.0.1>

Jack Trades <JackTradesPublic at gmail.com> wrote:

> Originally I had the 'data' directory in the same directory as the cgi
> scripts and was using os.system("svn commit"), however I kept running
> into weird bugs with this method.  So I moved the data directory out
> of the cgi directory and plan to use a separate repository.  So is
> there a prefered way to commit this directory to a subversion
> repository from a Python script?

Subversion has Python bindings, but for a friendlier interface have a look 
at http://pysvn.tigris.org/

An example from the docs at 
http://pysvn.tigris.org/docs/pysvn_prog_guide.html:

Commit changes to the repository

import pysvn
# edit the file foo.txt
f = open('./examples/pysvn/foo.txt', 'w')
f.write('Sample versioned file via python\n')
f.close()
# checkin the change with a log message
client = pysvn.Client()
client.checkin(['./examples/pysvn'], 'Corrected spelling of python in foo.txt')

-- 
Duncan Booth http://kupuguy.blogspot.com


From ldo at geek-central.gen.new_zealand  Tue May 19 03:53:06 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 19 May 2009 19:53:06 +1200
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<gutcdg$3st$4@lust.ihug.co.nz>
	<ac63e27e-2dd9-4c27-ace0-d9e205be7afa@s31g2000vbp.googlegroups.com>
Message-ID: <gutoh2$b0a$1@lust.ihug.co.nz>

In message <ac63e27e-2dd9-4c27-ace0-
d9e205be7afa at s31g2000vbp.googlegroups.com>, Jack Trades wrote:

> On May 19, 12:26 am, Lawrence D'Oliveiro <l... at geek-
> central.gen.new_zealand> wrote:
>
>> In message <2904e7de-0a8d-4697-9c44-
>>
>> c83bb5319... at s31g2000vbp.googlegroups.com>, Jack Trades wrote:
>> > Originally I had the 'data' directory in the same directory as the cgi
>> > scripts and was using os.system("svn commit"), however I kept running
>> > into weird bugs with this method.
>>
>> What bugs?
> 
> I'm not 100% sure, but I think it had to do with executable
> permissions on the cgi scripts.

Possibly your CGI scripts are running as some user like "nobody", which 
doesn't have the right access to the files/directories. Changing APIs won't 
help here.



From duncan.booth at invalid.invalid  Tue May 19 03:56:51 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 19 May 2009 07:56:51 GMT
Subject: Context manager, atexit processing,
	and PEP 3143 	DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>
	<87hbzk8eoh.fsf@benfinney.id.au>
	<ab4fa3490905181014v11bb0746p2f81f3a00dac9b8a@mail.gmail.com>
	<mailman.343.1242668632.8015.python-list@python.org>
	<87my9a6qfm.fsf@benfinney.id.au>
Message-ID: <Xns9C105A39B441Dduncanbooth@127.0.0.1>

Ben Finney <ben+python at benfinney.id.au> wrote:

> MRAB <google at mrabarnett.plus.com> writes:
> 
>> Gunter Henriksen wrote:
>> > If there is a function which triggers a one-shot switch, I like to
>> > have a way to find out if it has already been triggered, I prefer
>> > to have the function tell me if it triggered the switch or not, but
>> > I would not want that to be by raising an exception.
>> 
>> The 'file' class also has a 'closed' method, so that's a good model
>> to follow.
> 
> Yes, I find that convincing as well. (I might prefer it to instead
> answer the question ???is it currently open????, i.e. an ???opened???
> query, but that makes for more awkward English than ???closed???.)
> 
In the general case you might have an object which you create then open as 
an explicit step. Later you close it explicitly before it is discarded. In 
that case methods 'opened' and 'closed' both make sense but mean different 
things. For a file object, where construction always opens the file, an 
opened method (if it existed) should always return true so isn't useful.

Or in other words, I take the word 'opened' as meaning 'has been opened' 
which is not the same as 'is currently open'.

-- 
Duncan Booth http://kupuguy.blogspot.com


From hackingkk at gmail.com  Tue May 19 03:57:48 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Tue, 19 May 2009 13:27:48 +0530
Subject: issue: Permissions in odfpy
In-Reply-To: <862e00220905182351k3ec16f8dnc7841d7e749ff743@mail.gmail.com>
References: <862e00220905182351k3ec16f8dnc7841d7e749ff743@mail.gmail.com>
Message-ID: <1242719868.7276.16.camel@kk-laptop>

Through the python code,
chmod 400 <filename.ods>
happy hacking.
Krishnakant.

On Tue, 2009-05-19 at 12:21 +0530, shruti surve wrote:
> hey,
> i am using odfpy and  generating spreadsheet in open office..but
> nobody should modify the file..so can anybody tell me how can we give
> permissions (read only) to spreadsheet in odfpy??..i have change the
> properties of my normal open office spreadsheet file and made it read
> only..n also extracted it..but in conteny.xml also i am not finding
> any property which can be used in odfpy...so please give me some
> solution..
> 
> 
> regards
> shruti surve



From stablum at gmail.com  Tue May 19 04:09:32 2009
From: stablum at gmail.com (Francesco Stablum)
Date: Tue, 19 May 2009 10:09:32 +0200
Subject: problems with PyML: ImportError: No module named _ckernel
Message-ID: <377fd1f30905190109l6ab99c3cre6df335179d96798@mail.gmail.com>

Hello,
I am trying PyML ( http://PyML.sf.net ) with little success.
I tried to do the test: from PyML.demo import pyml_test

but all I got is that backtrace:
Traceback (most recent call last):
  File "./test.py", line 2, in <module>
    from PyML.demo import pyml_test
  File "/usr/src/PyML-0.7.2/PyML/__init__.py", line 4, in <module>
    from PyML.containers import *
  File "/usr/src/PyML-0.7.2/PyML/containers/__init__.py", line 3, in <module>
    VectorDataSet = __import__('PyML.containers.vectorDatasets',
fromlist=['']).VectorDataSet
  File "PyML/containers/vectorDatasets.py", line 4, in <module>
    from PyML.containers.baseDatasets import WrapperDataSet, BaseVectorDataSet
  File "PyML/containers/baseDatasets.py", line 4, in <module>
    from PyML.containers import ker
  File "PyML/containers/ker.py", line 6, in <module>
    from ext import ckernel
  File "PyML/containers/ext/ckernel.py", line 7, in <module>
    import _ckernel
ImportError: No module named _ckernel

Actually,  in the directory

/usr/lib/python2.5/site-packages/PyML/containers/ext/

there is the file _ckernel.so

and, if I do:
import _ckernel
in that directory, no problem happens.

Actually, there is a report for this bug:
http://sourceforge.net/forum/forum.php?thread_id=2167098&forum_id=393034
but nobody answered.

any ideas?
thanks in advance,
Francesco Stablum

-- 
The generation of random numbers is too important to be left to chance
- Robert R. Coveyou


From jeremiah.dodds at gmail.com  Tue May 19 04:09:49 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Tue, 19 May 2009 09:09:49 +0100
Subject: strip char from list of strings
In-Reply-To: <195055.64779.qm@web54204.mail.re2.yahoo.com>
References: <195055.64779.qm@web54204.mail.re2.yahoo.com>
Message-ID: <12cbbbfc0905190109m1aa45142r83fd7ceb4c9d8e93@mail.gmail.com>

On Mon, May 18, 2009 at 8:30 PM, Laurent Luce <laurentluce49 at yahoo.com>wrote:

>
> I have the following list:
>
> [ 'test\n', test2\n', 'test3\n' ]
>
> I want to remove the '\n' from each string in place, what is the most
> efficient way to do that ?
>
> Regards,
>
> Laurent
> --
> http://mail.python.org/mailman/listinfo/python-list
>


>>> s = [ 'test\n', test2\n', 'test3\n' ]
>>> [i.strip() for i in s]

['test', 'test2', 'test3']

>>> map(str.strip, s)

['test', 'test2', 'test3']


I'm not sure which one of these is more efficient, but it probably doesn't
really matter.
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From marco at sferacarta.com  Tue May 19 04:16:31 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Tue, 19 May 2009 10:16:31 +0200
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
In-Reply-To: <mailman.368.1242712875.8015.python-list@python.org>
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>	<gutcur$47g$2@lust.ihug.co.nz>
	<mailman.368.1242712875.8015.python-list@python.org>
Message-ID: <zVtQl.19140$Ux.11467@tornado.fastwebnet.it>

Chris Rebert wrote:

>>> On the other hand there are developers who much prefer to keep things
>>> light-weight and simple.
>> Would it be fair to say the first type tends to congregate in herds,
>> particularly in corporate IT departments, while the latter tends to operate
>> on a more individual basis?
> 
> That would certainly explain Lisp hackers!
> *(ducks)*

Oh, come on!

Corporate environments are usually positive towards Lisp hackers, and 
Lisp hackers are OTOH very positive towards corporate environments.
That's why they repel.



From piet at cs.uu.nl  Tue May 19 04:25:35 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Tue, 19 May 2009 10:25:35 +0200
Subject: strip char from list of strings
References: <mailman.371.1242718187.8015.python-list@python.org>
Message-ID: <m263fxcxds.fsf@cs.uu.nl>

>>>>> Laurent Luce <laurentluce49 at yahoo.com> (LL) wrote:

>LL> I have the following list:

>LL> [ 'test\n', test2\n', 'test3\n' ]

>LL> I want to remove the '\n' from each string in place, what is the
>LL> most efficient way to do that ? 

I suppose you mean you have lists similar to the one given because with
a list of 3 elements efficiency is a non-issue unless you do something
stupid or repeat the operation thousands of times. Even with a list of
1000 elements efficiency isn't very important. In fact you should worry
about efficiency only after there are signs that there might be a
problem. 

Secondly, in Python you cannot remove a character from a string in place
if that means modifying the string. Strings are immutable. So let us
suppose you mean that the list should stay in place, i.e if L is the
list that after the operation L is still the same object but L[i]
has become a string that has the value of the old L[i] with the '\n'
removed. Let us also suppose that in the original list every element has
exactly one '\n' at the end.

Then a simple loop should do it. The enumerate comes to mind as you need
both the index and the value of each element:

for i, value in enumerate(L):
    L[i] = value[:-1]

But it looks a bit silly to me to refer to the same list element as both
value and L[i]. So maybe the old-fashioned way is more clear:

for i in range(len(L)):
    L[i] = L[i][:-1]

I think the choice is a matter of taste. You can do some timing
experiments yourself to see if there are significant differences, but I
wouldn't expect so.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From ben+python at benfinney.id.au  Tue May 19 04:27:37 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Tue, 19 May 2009 18:27:37 +1000
Subject: Context manager, atexit processing,
	and PEP 3143  DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>
	<87hbzk8eoh.fsf@benfinney.id.au>
	<mailman.342.1242666875.8015.python-list@python.org>
Message-ID: <87fxf17b0m.fsf@benfinney.id.au>

Gunter Henriksen <gunterhenriksen at gmail.com> writes:

> If there is a function which triggers a one-shot switch, I like to
> have a way to find out if it has already been triggered, I prefer to
> have the function tell me if it triggered the switch or not, but I
> would not want that to be by raising an exception.

In this case, though, we're talking about a class intended to implement
the context manager API (in addition to other API).

So, following your argument above, we might expect a generic context
manager object to be able to tell us whether we're currently inside that
context or not. Does such a thing exist?

-- 
 \       ?If consumers even know there's a DRM, what it is, and how it |
  `\     works, we've already failed.? ?Peter Lee, Disney corporation, |
_o__)                                                             2005 |
Ben Finney


From steven at REMOVE.THIS.cybersource.com.au  Tue May 19 05:24:29 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 19 May 2009 09:24:29 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
Message-ID: <pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>

On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:

> Let me clarify what I think par, pmap, pfilter and preduce would mean
> and how they would be implemented. 
[...]

Just for fun, I've implemented a parallel-map function, and done a couple 
of tests. Comments, criticism and improvements welcome!



import threading
import Queue
import random
import time

def f(arg):  # Simulate a slow function.
    time.sleep(0.5)
    return 3*arg-2


class PMapThread(threading.Thread):
    def __init__(self, clients):
        super(PMapThread, self).__init__()
        self._clients = clients
    def start(self):
        super(PMapThread, self).start()
    def run(self):
        while True:
            try:
                data = self._clients.get_nowait()
            except Queue.Empty:
                break
            target, where, func, arg = data
            result = func(arg)
            target[where] = result


class VerbosePMapThread(threading.Thread):
    def __init__(self, clients):
        super(VerbosePMapThread, self).__init__()
        print "Thread %s created at %s" % (self.getName(), time.ctime())
    def start(self):
        super(VerbosePMapThread, self).start()
        print "Thread %s starting at %s" % (self.getName(), time.ctime())
    def run(self):
        super(VerbosePMapThread, self).run()
        print "Thread %s finished at %s" % (self.getName(), time.ctime())


def pmap(func, seq, verbose=False, numthreads=4):
    size = len(seq)
    results = [None]*size
    if verbose:
        print "Initiating threads"
        thread = VerbosePMapThread
    else:
        thread = PMapThread
    datapool = Queue.Queue(size)
    for i in xrange(size):
        datapool.put( (results, i, f, seq[i]) )
    threads = [PMapThread(datapool) for i in xrange(numthreads)]
    if verbose:
        print "All threads created."
    for t in threads:
        t.start()
    # Block until all threads are done.
    while any([t.isAlive() for t in threads]):
        if verbose:
            time.sleep(0.25)
            print results
    return results


And here's the timing results:

>>> from timeit import Timer
>>> setup = "from __main__ import pmap, f; data = range(50)"
>>> min(Timer('map(f, data)', setup).repeat(repeat=5, number=3))
74.999755859375
>>> min(Timer('pmap(f, data)', setup).repeat(repeat=5, number=3))
20.490942001342773



-- 
Steven


From terminatorul at gmail.com  Tue May 19 05:54:54 2009
From: terminatorul at gmail.com (Timothy Madden)
Date: Tue, 19 May 2009 05:54:54 -0400
Subject: python3 module for dbus ?
Message-ID: <4a1281ef$0$90271$14726298@news.sunsite.dk>

Hello

Sorry if this is not the right newsgroup for python modules, I found no 
other appropriate one.

I would like to start a project in python and I think it would be good 
to start with python3.0, but I need tu use glib, dbus, wxWidgets and 
postgresql.

Do you know if I can get dbus bindings for python3 and glib bindings for 
python3 ? Or could I use them otherwise (like without the modules) ?

Thank you
Timothy Madden


From grante at visi.com  Tue May 19 06:47:04 2009
From: grante at visi.com (Grant Edwards)
Date: Tue, 19 May 2009 05:47:04 -0500
Subject: UDP reading on multiple sockets
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net>
	<15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>
	<27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
Message-ID: <bemdncqkNYS1E4_XnZ2dnUVZ_gZi4p2d@posted.usinternet>

On 2009-05-18, thomas.vogel at likeabird.de <thomas.vogel at likeabird.de> wrote:
> On 17 Mai, 04:22, Grant Edwards <gra... at visi.com> wrote:
>> On 2009-05-17, Thomas Vogel <thomas.vo... at likeabird.de> wrote:
>>
>> > I'm currently have the problem that I try to read UDP messages from
>> > multiple sockets in parallel. So let's say I get UDP packets from the
>> > same IP on the ports 2000, 2001, 2002,...
>>
>> Is there any reason you can't do it the easy way by using
>> select?
>>
>> http://docs.python.org/library/select.html
>
> The only honest answer would be that I'm totaly unfamiliar
> with select and also the documentation I found wasn't able to
> clear the picture. So are there examples of using select
> together with sockets available?

http://www.google.com/search?q=python+select+example

http://www.amk.ca/python/howto/sockets/
http://code.activestate.com/recipes/531824/
http://mail.python.org/pipermail/python-list/2001-February/071302.html
http://squirl.nightmare.com/medusa/async_sockets.html

-- 
Grant



From grante at visi.com  Tue May 19 06:52:04 2009
From: grante at visi.com (Grant Edwards)
Date: Tue, 19 May 2009 05:52:04 -0500
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
Message-ID: <bemdncWkNYTJEo_XnZ2dnUVZ_gZi4p2d@posted.usinternet>

On 2009-05-19, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:
>
>> Let me clarify what I think par, pmap, pfilter and preduce would mean
>> and how they would be implemented. 
> [...]
>
> Just for fun, I've implemented a parallel-map function, and done a couple 
> of tests. Comments, criticism and improvements welcome!

My only comment would be that your "slow function" might not be
a very simulation for the general-case, since it uses
time.sleep() which releases the GIL:

> def f(arg):  # Simulate a slow function.
>     time.sleep(0.5)
>     return 3*arg-2

Any Python function that isn't calling a library function
written in C that releases the GIL won't show any speedup will
it?  I don't have a multi-core machine to try it on, but what
happens when you replace your "slow function" code with
something that actually burns CPU using pure-Python code
instead of blocking on a timer in the OS?

-- 
Grant



From jeremy at martinfamily.freeserve.co.uk  Tue May 19 06:57:43 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Tue, 19 May 2009 03:57:43 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
Message-ID: <d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>

On 19 May, 00:32, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:
> > However I *do* actually want to add syntax to the language. I think that
> > 'par' makes sense as an official Python construct - we already have had
> > this in the Occam programming language for twenty-five years. The reason
> > for this is ease of use. I would like to make it easy for amateur
> > programmers to exploit natural parallelism in their algorithms. For
> > instance somebody who wishes to calculate a property of each member from
> > a list of chemical structures using the Python Daylight interface: with
> > my suggestion they could potentially get a massive speed up just by
> > changing 'for' to 'par' or 'map' to 'pmap'. (Or map with a parallel
> > keyword argument set as suggested). At present they would have to
> > manually chop up their work and run it as multiple processes in order to
> > achieve the same - fine for expert programmers but not reasonable for
> > people working in other domains who wish to use Python as a utility
> > because of its fantastic productivity and ease of use.
>
> There seems to be some discrepancy between this, and what you wrote in
> your first post:
>
> "There would be no locking and it would be the programmer's
> responsibility to ensure that the loop was truly parallel and correct."
>
> So on the one hand, you want par to be utterly simple-minded and to do no
> locking. On the other hand you want it so simple to use that amateurs can
> mechanically replace 'for' with 'par' in their code and everything will
> Just Work, no effort or thought required. But those two desires are
> inconsistent.
>
> Concurrency is an inherently complicated problem: deadlocks and race
> conditions abound, and are notoriously hard to reproduce, let alone
> debug. If par is simple, and does no locking, then the programmer needs
> to worry about those complications. If you want programmers to ignore
> those complications, either (1) par needs to be very complicated and
> smart, to do the Right Thing in every case, or (2) you're satisfied if
> par produces buggy code when used in the fashion you recommend.
>
> The third option is, make par really simple and put responsibility on the
> user to write code which is concurrent. I think that's the right
> solution, but it means a simplistic "replace `for` with `par` and your
> code will run faster" will not work. It might run faster three times out
> of five, but the other two times it will hang in a deadlock, or produce
> incorrect results, or both.
>
> --
> Steven

Hi Steven,

> you want it so simple to use that amateurs can mechanically replace 'for' with 'par' in their
> code and everything will Just Work, no effort or thought required.

Yes I do want the par construction to be simple, but of course you
can't just replace a for loop with a par loop in the general case.
This issue arises when people use OpenMP: you can take a correct piece
of code, add a comment to indicate that a loop is 'parallel', and if
you get it wrong the code with no longer work correctly. With my 'par'
construct the programmer's intention is made explicit in the code,
rather than by a compiler directive and so I think that is clearer
than OpenMP.

As I wrote before, concurrency is one of the hardest things for
professional programmers to grasp. For 'amateur' programmers we need
to make it as simple as possible, and I think that a parallel loop
construction and the dangers that lurk within would be reasonably
straightforward to explain: there are no locks to worry about, no
message passing. The only advanced concept is the 'sync' keyword,
which would be used to rendezvous all the threads. That would only be
used to speed up certain codes in order to avoid having to repeatedly
shut down and start up gangs of threads.

Jeremy


From jeremy at martinfamily.freeserve.co.uk  Tue May 19 07:05:48 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Tue, 19 May 2009 04:05:48 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com> 
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com> 
	<a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com>
Message-ID: <349328ba-e396-46aa-ac4b-ae5d7c2796a9@v17g2000vbb.googlegroups.com>

On 19 May, 03:31, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 18, 1:52?pm, jer... at martinfamily.freeserve.co.uk wrote:
>
> > As I understand it the reason for the GIL is to prevent problems with
> > garbage collection in multi-threaded applications.
>
> Not really. ?It's main purpose to prevent context switches from
> happening in the middle of some C code (essentially it makes all C
> code a "critical" section, except when the C code explicitly releases
> the GIL). ?This tremendously simplifies the task of writing extension
> modules, not to mention the Python core.
>
> > Without it the
> > reference count method is prone to race conditions. However it seems
> > like a fairly crude mechanism to solve this problem. Individual
> > semaphores could be used for each object reference counter, as in
> > Java.
>
> Java doesn't use reference counting.
>
> Individual locks on the refcounts would be prohibitively expensive in
> Python, a cost that Java doesn't have.
>
> Even if you decided to accept the penalty and add locking to
> refcounts, you still have to be prepared for context switching at any
> time when writing C code, which means in practice you have to lock any
> object that's being accessed--that's in addition to the refcount lock.
>
> I am not disagreeing with your assessment in general, it would be
> great if Python were better able to take advantage of multiple cores,
> but it's not as simple a thing as you're making it out to be.
>
> Carl Banks

Hi Carl,

> I am not disagreeing with your assessment in general, it would be
> great if Python were better able to take advantage of multiple cores,
> but it's not as simple a thing as you're making it out to be.

Thanks for explaining a few things to me. So it would seem that
replacing the GIL with something which allows better scalability of
multi-threaded applications, would be very complicated. The paper by
Jesse Nolle which I referenced in my original posting includes the
following:

"In 1999 Greg Stein created a patch set for the interpreter that
removed the GIL, but added granular locking around sensitive
interpreter operations. This patch set had the direct effect of
speeding up threaded execution, but made single threaded execution two
times slower."

Source: http://jessenoller.com/2009/02/01/python-threads-and-the-global-interpreter-lock/

That was ten years ago - do you have any idea as to how things have
been progressing in this area since then?

Jeremy


From totobe at gmail.com  Tue May 19 07:13:04 2009
From: totobe at gmail.com (wdveloper)
Date: Tue, 19 May 2009 04:13:04 -0700 (PDT)
Subject: Best library to make XSLT 2.0 transformation
Message-ID: <7fa6e7f2-00ae-4b9b-86a2-0ce62b9914d1@q14g2000vbn.googlegroups.com>

Hi there,

I need to make xml transformation using XSLT 2.0 (since i want to use
the powerful tag <xsl:result-document> to produce multiple files).
In your experience, which kind of library out there is better?

Thanks!


From google at mrabarnett.plus.com  Tue May 19 07:37:35 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 19 May 2009 12:37:35 +0100
Subject: Context manager, atexit processing,
	and PEP 3143 	DaemonContext.close
In-Reply-To: <Xns9C105A39B441Dduncanbooth@127.0.0.1>
References: <87bppsa6y8.fsf@benfinney.id.au>	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>	<87tz3k8lfc.fsf@benfinney.id.au>	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>	<87hbzk8eoh.fsf@benfinney.id.au>	<ab4fa3490905181014v11bb0746p2f81f3a00dac9b8a@mail.gmail.com>	<mailman.343.1242668632.8015.python-list@python.org>	<87my9a6qfm.fsf@benfinney.id.au>
	<Xns9C105A39B441Dduncanbooth@127.0.0.1>
Message-ID: <4A1299FF.90100@mrabarnett.plus.com>

Duncan Booth wrote:
> Ben Finney <ben+python at benfinney.id.au> wrote:
> 
>> MRAB <google at mrabarnett.plus.com> writes:
>>
>>> Gunter Henriksen wrote:
>>>> If there is a function which triggers a one-shot switch, I like to
>>>> have a way to find out if it has already been triggered, I prefer
>>>> to have the function tell me if it triggered the switch or not, but
>>>> I would not want that to be by raising an exception.
>>> The 'file' class also has a 'closed' method, so that's a good model
>>> to follow.
>> Yes, I find that convincing as well. (I might prefer it to instead
>> answer the question ???is it currently open????, i.e. an ???opened???
>> query, but that makes for more awkward English than ???closed???.)
>>
> In the general case you might have an object which you create then open as 
> an explicit step. Later you close it explicitly before it is discarded. In 
> that case methods 'opened' and 'closed' both make sense but mean different 
> things. For a file object, where construction always opens the file, an 
> opened method (if it existed) should always return true so isn't useful.
> 
> Or in other words, I take the word 'opened' as meaning 'has been opened' 
> which is not the same as 'is currently open'.
> 
Equally you could say that "closed" means "has been closed", which is
not the same as "is currently closed". Unusual, but possible! :-)

Borrowing from the string class, it would be "isopen" (like "isdigit",
probably influenced by C), although these days we would write "is_open".


From deets at nospam.web.de  Tue May 19 07:42:32 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 19 May 2009 13:42:32 +0200
Subject: Best library to make XSLT 2.0 transformation
References: <7fa6e7f2-00ae-4b9b-86a2-0ce62b9914d1@q14g2000vbn.googlegroups.com>
Message-ID: <77fk56F1fg5c6U1@mid.uni-berlin.de>

wdveloper wrote:

> Hi there,
> 
> I need to make xml transformation using XSLT 2.0 (since i want to use
> the powerful tag <xsl:result-document> to produce multiple files).
> In your experience, which kind of library out there is better?

XSLT is a standard, so if you find a library that implements it, there
shouldn't be much differences.

Having said that, these days lxml2 is the craze, and it contains
xslt-processing. It would be my first (and hopefully last) stop.

Diez


From Caseyweb at gmail.com  Tue May 19 08:13:28 2009
From: Caseyweb at gmail.com (Casey Webster)
Date: Tue, 19 May 2009 05:13:28 -0700 (PDT)
Subject: strip char from list of strings
References: <mailman.371.1242718187.8015.python-list@python.org>
Message-ID: <e2c96842-552a-41d3-80c7-818d5ec09084@f16g2000vbf.googlegroups.com>

On May 18, 3:30?pm, Laurent Luce <laurentluc... at yahoo.com> wrote:
> I have the following list:
>
> [ 'test\n', test2\n', 'test3\n' ]
>
> I want to remove the '\n' from each string in place, what is the most efficient way to do that ?
>
> Regards,
>
> Laurent

Do you _really_ need to do this in place?  If not, the simplest answer
is probably:

>>> x = ['test\n', test2\n', 'test3\n']
>>> x = [s.rstrip('\n') for s in x]

And if what you really want to do is strip off all trailing whitespace
(tabs, spaces, and newlines), then:

>>> x = [s.rstrip() for s in x]

A quick test of 1,000,000 strings of length 27 took less than 0.2
seconds on my PC.  Efficiency isn't really much of an issue for most
data sets.


From darcy at druid.net  Tue May 19 08:20:13 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Tue, 19 May 2009 08:20:13 -0400
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
	<loom.20090518T151856-387@post.gmane.org>
	<8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com>
Message-ID: <20090519082013.65fba203.darcy@druid.net>

On Tue, 19 May 2009 10:51:57 +0530
Kalyan Chakravarthy <kalyanchakravarthy at hyit.com> wrote:
> Actually my requirement is
> in an web application when user enters User name and Password,
> back end i needs to check, is it they entered correct user name with
> password ( here i want to read the Spread Sheet Data in Python code  ),
> for this i will keep all the user names and passwords in Google Spread Sheet

I can't answer your question about reading Google spreadsheets but I do
wonder why you are trying to solve a database problem with a
spreadsheet in the first place, especially with all the support Python
has for database access.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From phihag at phihag.de  Tue May 19 08:27:11 2009
From: phihag at phihag.de (Philipp Hagemeister)
Date: Tue, 19 May 2009 14:27:11 +0200
Subject: identifying live hosts on a network
In-Reply-To: <069f821d-1b73-4ed9-b298-09e7c0548122@p6g2000pre.googlegroups.com>
References: <069f821d-1b73-4ed9-b298-09e7c0548122@p6g2000pre.googlegroups.com>
Message-ID: <4A12A59F.4080107@phihag.de>

We acknowledge your problems with a network script idenifying live hosts
on your network.

Seriously, you have to tell us a little bit more so that we can help
you. How about you actually post the script, and actually post the
trouble (What exactly do you expect? What exactly do you see? What other
steps have you tried?)

Philipp

hunteroakesgun at gmail.com wrote:
> HI
> I am new to python and am having trouble coming up with a script that
> idenifies all the live hosts on my network.
> thanks Hunter



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From a.cavallo at cavallinux.eu  Tue May 19 08:29:47 2009
From: a.cavallo at cavallinux.eu (A. Cavallo)
Date: Tue, 19 May 2009 13:29:47 +0100
Subject: Package problem
In-Reply-To: <5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
	<5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
Message-ID: <200905191329.48531.a.cavallo@cavallinux.eu>

> > It is solved in other languages.. for example perl.. and delphi
> I don't know much about perl, and even less about delphi, but I am
> pretty sure it does not solve the problem of overwriting files from a
> package with an installation outside the control of the package
> manager.

On a sytem a possible solution would be:

 /usr/lib/python2.5/site-package/foobar <- The os managed one
 /usr/lib/python2.5/site-package/foobar-2.0 <- The alternatives
 /usr/lib/python2.5/site-package/foobar-2.1 

and using something (in the python interpreter)

import foobar (imports the foobar)
import foobar requires >= 2.1 (imports foobar 2.1 or above)

>
> There is no simple solution to the following situation:
>    - install setuptools from ubuntu -> files get into /usr
> (/usr/lib/python2.5/site-packages, etc...)

setuptools is the problem;) It tries to do too many things imho.

> > Fight it ??? I didn't even get a python interpreter with my operating
> > system...

You could try:

http://download.opensuse.org/repositories/home:/cavallo71:/python-opt/

This is a python interpreter installed under /opt/opt-python-2.7a0.
All you have to do is sourcing /opt/opt-python-2.7a0/opt-python-env.sh
from a shell and start using the python 2.7 (it's directly from the svn 
trunk).

If you download a python module to generate the rpm for it all you have to do 
is:
$> . /opt/opt-python-2.7a0/opt-python-env.sh
$> python setup.py bdist_rpm 

It will generate a package rpm installable under /opt/python-2.7a0 and won't 
interfere with the system.

I hope this will help,
Regards,
Antonio







From benjamin.kaplan at case.edu  Tue May 19 08:43:48 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 19 May 2009 08:43:48 -0400
Subject: Package problem
In-Reply-To: <5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
	<39468261f5a617fdea45101268b7be6c@preisshare.net>
	<5b8d13220905182153j490f4826kf2b21422de901210@mail.gmail.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
	<5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
Message-ID: <ec96e1390905190543q3bd62826t4e172f6ce5704997@mail.gmail.com>

On Tue, May 19, 2009 at 2:45 AM, David Cournapeau <cournape at gmail.com>wrote:

> On Tue, May 19, 2009 at 2:35 PM, David Lyon <david.lyon at preisshare.net>
> wrote:
> > On Tue, 19 May 2009 13:53:18 +0900, David Cournapeau <cournape at gmail.com
> >
> > wrote:
> >> Given that nobody has managed to solve this problem, I doubt you will
> >> find a solution.
> >
> > It is solved in other languages.. for example perl.. and delphi
>
> I don't know much about perl, and even less about delphi, but I am
> pretty sure it does not solve the problem of overwriting files from a
> package with an installation outside the control of the package
> manager.
>
> There is no simple solution to the following situation:
>   - install setuptools from ubuntu -> files get into /usr
> (/usr/lib/python2.5/site-packages, etc...)
>   - install setuptools from sources into /usr: overwrite files from
> the python-setuptools debian package, with an updated version which is
> not compatible with the packaged one -> every Ubuntu package depending
> on setuptools is now broken. Worse, it may not be possible to rollback
> to a working situation.
>
> To make it work, you would have to somehow notify the package
> management system about the updated version. But still, the whole
> value of a package manager is to have a whole set of packages which
> are tested together. Updating packages 'randomly' from 3rd party
> sources is inherently against this.
>

Actually, the point in the package manager is to handle updates and
uninstalls gracefully. As long as you stick with using the package manager,
everything should be handled fine regardless of whether you're using an
official repository, a third party repository (wxPython has its own), or a
downloaded debian package (such as with OpenOffice).


> > Fight it ??? I didn't even get a python interpreter with my operating
> > system...
> >
> > So there's no possible way I can be against it...
>
> By fighting, I meant that because OS don't always have uptodate
> packages you want to depend on, trying to implement a system to update
> the packages is backward. The problem is depending on those recent
> libraries in the first place if you want to run on many
> configurations.
>

I think other-David was talking about Windows here. Which is completely
irrelevant to this thread about easy_install vs. a system package manager.
Mostly, he was just trying to plug for his own project.


>
> cheers,
>
> David
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From aahz at pythoncraft.com  Tue May 19 08:57:34 2009
From: aahz at pythoncraft.com (Aahz)
Date: 19 May 2009 05:57:34 -0700
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
References: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>
	<51d1dd3f-322d-47fa-9d44-75b92c6ef4e2@e20g2000vbc.googlegroups.com>
	<2003c02c-6a9f-40fb-b19c-30625ed09eb0@s21g2000vbb.googlegroups.com>
	<fc58e391-7979-4220-b6c9-a06c23ee4dbb@21g2000vbk.googlegroups.com>
Message-ID: <guuabu$9ie$1@panix3.panix.com>

In article <fc58e391-7979-4220-b6c9-a06c23ee4dbb at 21g2000vbk.googlegroups.com>,
 <henning.vonbargen at arcor.de> wrote:
>Aahz:
>>
>> You probably want to start by figuring out which threading library is
>> being used -- Python normally wants Posix threads, but IIRC, that's not
>> the default on HP-UX, and you may need to fix the build process to use
>> Posix.
>
>You're probably right, but I'm lost here, since I'm neither a *nix nor
>a HP-UX expert in building software from source. I'm used to
>"configure; make; make install", which usually works well on other
>platforms...

Try finding a usergroup/list for HP, you will probably have better luck
there.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From exarkun at divmod.com  Tue May 19 09:11:13 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Tue, 19 May 2009 09:11:13 -0400
Subject: UDP reading on multiple sockets
In-Reply-To: <27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
Message-ID: <20090519131113.21531.1412825823.divmod.quotient.23270@henry.divmod.com>

On Mon, 18 May 2009 06:19:01 -0700 (PDT), thomas.vogel at likeabird.de wrote:
>On 17 Mai, 04:22, Grant Edwards <gra... at visi.com> wrote:
>> On 2009-05-17, Thomas Vogel <thomas.vo... at likeabird.de> wrote:
>>
>> > I'm currently have the problem that I try to read UDP messages from
>> > multiple sockets in parallel. So let's say I get UDP packets from the
>> > same IP on the ports 2000, 2001, 2002,...
>>
>> Is there any reason you can't do it the easy way by using
>> select?
>>
>> http://docs.python.org/library/select.html
>>
>> --
>> Grant
>
>The only honest answer would be that I'm totaly unfamiliar with select
>and also the documentation I found wasn't able to clear the picture.
>So are there examples of using select together with sockets available?
>

You might find Twisted easier to use correctly than the select module.
You can find some basic Twisted/UDP documentation here:

  http://twistedmatrix.com/projects/core/documentation/howto/udp.html

You can trivially change the first example to handle multiple sockets -
just add more reactor.listenUDP calls.

Jean-Paul


From aotto1968 at t-online.de  Tue May 19 09:16:55 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Tue, 19 May 2009 15:16:55 +0200
Subject: PYTHONPATH on Windows XP module load problem
Message-ID: <guubg7$nnk$03$1@news.t-online.com>

Hi,

  I have the following problem using python on windows.
  I crated a binary extension called

        pymsgque.dll

  on windows. The same extension works fine on UNIX/Linux.

  The problem is on Windows. The build is no problem 
  but python is not able to load this extension with

        import pymsgque

  and create the following error:

  Traceback (most recent call last):
  File "server.py", line 13, in <module>
    import pymsgque
ImportError: No module named pymsgque
[31906 refs]

  the PYTHONPATH variable has the directory of
  pymsgque.dll location

  the build of python and the pymsgque extension was done using
        > Microsoft Visual C++ Express Edition

  it seems that I missing something

mfg

  Andreas Otto


From aahz at pythoncraft.com  Tue May 19 09:19:34 2009
From: aahz at pythoncraft.com (Aahz)
Date: 19 May 2009 06:19:34 -0700
Subject: identifying live hosts on a network
References: <069f821d-1b73-4ed9-b298-09e7c0548122@p6g2000pre.googlegroups.com>
Message-ID: <guubl6$28b$1@panix3.panix.com>

In article <069f821d-1b73-4ed9-b298-09e7c0548122 at p6g2000pre.googlegroups.com>,
 <hunteroakesgun at gmail.com> wrote:
>
>I am new to python and am having trouble coming up with a script that
>idenifies all the live hosts on my network.

First you need to define what constitutes a "live host".
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From JackTradesPublic at gmail.com  Tue May 19 09:24:26 2009
From: JackTradesPublic at gmail.com (Jack Trades)
Date: Tue, 19 May 2009 06:24:26 -0700 (PDT)
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<Xns9C1058657406Dduncanbooth@127.0.0.1>
Message-ID: <9dc7ca0a-7bb7-4027-af72-c1b7410dc792@r3g2000vbp.googlegroups.com>

On May 19, 3:46?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Jack Trades <JackTradesPub... at gmail.com> wrote:
> > Originally I had the 'data' directory in the same directory as the cgi
> > scripts and was using os.system("svn commit"), however I kept running
> > into weird bugs with this method. ?So I moved the data directory out
> > of the cgi directory and plan to use a separate repository. ?So is
> > there a prefered way to commit this directory to a subversion
> > repository from a Python script?
>
> Subversion has Python bindings, but for a friendlier interface have a look
> athttp://pysvn.tigris.org/
>
> An example from the docs athttp://pysvn.tigris.org/docs/pysvn_prog_guide.html:
>
> Commit changes to the repository
>
> import pysvn
> # edit the file foo.txt
> f = open('./examples/pysvn/foo.txt', 'w')
> f.write('Sample versioned file via python\n')
> f.close()
> # checkin the change with a log message
> client = pysvn.Client()
> client.checkin(['./examples/pysvn'], 'Corrected spelling of python in foo.txt')
>
> --
> Duncan Boothhttp://kupuguy.blogspot.com

Thanks that's what I was looking for.


From JackTradesPublic at gmail.com  Tue May 19 09:32:04 2009
From: JackTradesPublic at gmail.com (Jack Trades)
Date: Tue, 19 May 2009 06:32:04 -0700 (PDT)
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<gutcdg$3st$4@lust.ihug.co.nz>
	<ac63e27e-2dd9-4c27-ace0-d9e205be7afa@s31g2000vbp.googlegroups.com>
	<gutoh2$b0a$1@lust.ihug.co.nz>
Message-ID: <5f7f9840-0e17-48fb-acf9-04186fb1b7ab@r3g2000vbp.googlegroups.com>

On May 19, 3:53?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <ac63e27e-2dd9-4c27-ace0-
>
> d9e205be7... at s31g2000vbp.googlegroups.com>, Jack Trades wrote:
> > On May 19, 12:26 am, Lawrence D'Oliveiro <l... at geek-
> > central.gen.new_zealand> wrote:
>
> >> In message <2904e7de-0a8d-4697-9c44-
>
> >> c83bb5319... at s31g2000vbp.googlegroups.com>, Jack Trades wrote:
> >> > Originally I had the 'data' directory in the same directory as the cgi
> >> > scripts and was using os.system("svn commit"), however I kept running
> >> > into weird bugs with this method.
>
> >> What bugs?
>
> > I'm not 100% sure, but I think it had to do with executable
> > permissions on the cgi scripts.
>
> Possibly your CGI scripts are running as some user like "nobody", which
> doesn't have the right access to the files/directories. Changing APIs won't
> help here.

Thanks for the help, I'll have to look into that further.  If that is
the case, would setuid be appropriate here?  Or is there a better way
to give the script the appropriate permissions?
The only thing that baffles me is that the script works before a
commit and only sometimes after a commit, if it were an access problem
wouldn't it fail before the commit as well?


From tjreedy at udel.edu  Tue May 19 09:43:36 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 19 May 2009 09:43:36 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <349328ba-e396-46aa-ac4b-ae5d7c2796a9@v17g2000vbb.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com>
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com>
	<a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com>
	<349328ba-e396-46aa-ac4b-ae5d7c2796a9@v17g2000vbb.googlegroups.com>
Message-ID: <guud26$dk7$1@ger.gmane.org>

jeremy at martinfamily.freeserve.co.uk wrote:

> "In 1999 Greg Stein created a patch set for the interpreter that
> removed the GIL, but added granular locking around sensitive
> interpreter operations. This patch set had the direct effect of
> speeding up threaded execution, but made single threaded execution two
> times slower."
> 
> Source: http://jessenoller.com/2009/02/01/python-threads-and-the-global-interpreter-lock/
> 
> That was ten years ago - do you have any idea as to how things have
> been progressing in this area since then?

The slowdown may be less severe, but known attempts to replace, rather 
than merely remove, GIL slow down single thread execution.  Otherwise, 
GIL wouild be gone.  No one has been willing to maintain a multi-thread 
fork/branch.



From tjreedy at udel.edu  Tue May 19 09:50:18 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 19 May 2009 09:50:18 -0400
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <20090519082013.65fba203.darcy@druid.net>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>	<loom.20090518T151856-387@post.gmane.org>	<8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com>
	<20090519082013.65fba203.darcy@druid.net>
Message-ID: <guudeo$f15$1@ger.gmane.org>

D'Arcy J.M. Cain wrote:
> On Tue, 19 May 2009 10:51:57 +0530
> Kalyan Chakravarthy <kalyanchakravarthy at hyit.com> wrote:
>> Actually my requirement is
>> in an web application when user enters User name and Password,
>> back end i needs to check, is it they entered correct user name with
>> password ( here i want to read the Spread Sheet Data in Python code  ),
>> for this i will keep all the user names and passwords in Google Spread Sheet
> 
> I can't answer your question about reading Google spreadsheets but I do
> wonder why you are trying to solve a database problem with a
> spreadsheet in the first place, especially with all the support Python
> has for database access.

Hardly even a database problem.  OP only needs a dict mapping username 
to passwd.  Of course, that could grow...

An issue not touched on is that passwords should *not* be kept in 
plaintext form.  Hence the data store should be written by program and 
not hand-edited.  With a small dict kept in memory, a pickle might work 
fine.

tjr




From darcy at druid.net  Tue May 19 09:57:17 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Tue, 19 May 2009 09:57:17 -0400
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <guudeo$f15$1@ger.gmane.org>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
	<loom.20090518T151856-387@post.gmane.org>
	<8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com>
	<20090519082013.65fba203.darcy@druid.net>
	<guudeo$f15$1@ger.gmane.org>
Message-ID: <20090519095717.8370d2e6.darcy@druid.net>

On Tue, 19 May 2009 09:50:18 -0400
Terry Reedy <tjreedy at udel.edu> wrote:
> D'Arcy J.M. Cain wrote:
> > I can't answer your question about reading Google spreadsheets but I do
> > wonder why you are trying to solve a database problem with a
> 
> Hardly even a database problem.  OP only needs a dict mapping username 
> to passwd.  Of course, that could grow...

s/could/will/

> An issue not touched on is that passwords should *not* be kept in 
> plaintext form.  Hence the data store should be written by program and 

I hear you but I'm not so sure that that is an absolute.  There are
many applications that allow you to have your password emailed to you.
For something with low risk that's perfectly acceptable.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From google at mrabarnett.plus.com  Tue May 19 10:08:44 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 19 May 2009 15:08:44 +0100
Subject: PYTHONPATH on Windows XP module load problem
In-Reply-To: <guubg7$nnk$03$1@news.t-online.com>
References: <guubg7$nnk$03$1@news.t-online.com>
Message-ID: <4A12BD6C.5000508@mrabarnett.plus.com>

Andreas Otto wrote:
> Hi,
> 
>   I have the following problem using python on windows.
>   I crated a binary extension called
> 
>         pymsgque.dll
> 
>   on windows. The same extension works fine on UNIX/Linux.
> 
>   The problem is on Windows. The build is no problem 
>   but python is not able to load this extension with
> 
>         import pymsgque
> 
>   and create the following error:
> 
>   Traceback (most recent call last):
>   File "server.py", line 13, in <module>
>     import pymsgque
> ImportError: No module named pymsgque
> [31906 refs]
> 
>   the PYTHONPATH variable has the directory of
>   pymsgque.dll location
> 
>   the build of python and the pymsgque extension was done using
>         > Microsoft Visual C++ Express Edition
> 
>   it seems that I missing something
> 
> mfg
> 
>   Andreas Otto

Does this help?

http://pyfaq.infogami.com/is-a-pyd-file-the-same-as-a-dll



From james at agentultra.com  Tue May 19 10:12:12 2009
From: james at agentultra.com (J Kenneth King)
Date: Tue, 19 May 2009 10:12:12 -0400
Subject: Annoying feedparser issues
References: <4a0e0daf$0$1645$742ec2ed@news.sonic.net>
Message-ID: <85ab59kwqr.fsf@agentultra.com>

John Nagle <nagle at animats.com> writes:

>     This really isn't the fault of the "feedparser" module, but it's
> worth mentioning.
>
>     I have an application which needs to read each new item from a feed
> as it shows up, as efficiently as possible, because it's monitoring multiple
> feeds.  I want exactly one copy of each item as it comes in.
>
>     In theory, this is easy.  Each time the feed is polled, pass in the
> timestamp and ID from the previous poll, and if nothing has changed,
> a 304 status should come back.
>
>     Results are spotty.  It mostly works for Reuters.  It doesn't work
> for Twitter at all; Twitter updates the timestamp even when nothing changes.
> So items are routinely re-read.  (That has to be costing Twitter a huge
> amount of bandwidth from useless polls.)
>
>     Some sites have changing feed etags because they're using multiple
> servers and a load balancer. These can be recognized because the same
> etags will show up again after a change.
>
>     Items can supposedly be unduplicated by using the "etag" value.
> This almost works, but it's tricker than one might think.  On some feeds,
> an item might go away, yet come back in a later feed.  This happens with
> news feeds from major news sources, because they have priorities that
> don't show up in RSS.  High priority stories might push a low priority story
> off the feed, but it may come back later.  Also, every night at 00:00, some
> feeds like Reuters re-number everything.  The only thing that works reliably
> is comparing the story text.
>
> 					John Nagle

I can't really offer much help, but I feel your pain.  I had to write
something of a similar system for a large company once and it hurt.
They mixed different formats with different protocols and man it was
something in the end.  The law of fuzzy inputs makes this stuff tough.

It may help to create a hash from the first x number of bytes of the
article text.  Then cache all the hashes in a local dbm-style
database.  We used berkely, but it doesn't really matter.  Whatever
way you can generate and store a keyed signature will allow you to do
a quick look up and see if you've already processed that article.


From david.lyon at preisshare.net  Tue May 19 10:13:21 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 19 May 2009 10:13:21 -0400
Subject: Package problem
In-Reply-To: <5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
	<39468261f5a617fdea45101268b7be6c@preisshare.net>
	<5b8d13220905182153j490f4826kf2b21422de901210@mail.gmail.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
	<5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
Message-ID: <b52625f2c83c1bbff61a44ec74f0b2e8@preisshare.net>

On Tue, 19 May 2009 15:45:42 +0900, David Cournapeau <cournape at gmail.com>
wrote:
> There is no simple solution to the following situation:
>    - install setuptools from ubuntu...

When I have a ubuntu system I will try it....

> But still, the whole
> value of ..(python).. is to have a whole set of packages which
> are tested together. Updating packages 'randomly' from 3rd party
> sources is inherently against this.

Well I presume pypi goes a long way to offering this...

I've used easy_install a few hundred times manually now and I've 
noticed some incorrect outcomes. For example, downloading a
package marked debian into my windows system... and wondering
why it didn't work....

for most packages... it seems to work quite well though..

I think the issue is really that if we can do tests and count
test results.. we'll probably get a lot further than we have
in the past.

We seem to be at the 85% mark... next stop should be 95% or
at least some known and measurable number...

I'm fully agreeing it can get better...

David







From colinlandrum at gmail.com  Tue May 19 10:19:20 2009
From: colinlandrum at gmail.com (hubritic)
Date: Tue, 19 May 2009 07:19:20 -0700 (PDT)
Subject: pyparsing question: single word values with a double quoted string 
	every once in a while
Message-ID: <c3c9c0a6-2229-4f80-873c-99a43ed3a36f@s38g2000prg.googlegroups.com>

I want to parse a log that has entries like this:

[2009-03-17 07:28:05.545476 -0500] rprt s=d2bpr80d6 m=2 mod=mail
cmd=msg module=access rule=x_dynamic_ip action=discard attachments=0
rcpts=1
routes=DL_UK_ALL,NOT_DL_UK_ALL,default_inbound,firewallsafe,mail01_mail02,spfsafe
size=4363 guid=291f0f108fd3a6e73a11f96f4fb9e4cd hdr_mid=
qid=n2HCS4ks025832 subject="I want to interview you" duration=0.236
elapsed=0.280


the keywords will not always be the same. Also differing log levels
will provide a different mix of keywords.

This is good enough to get the majority of cases where there is a
keyword, a "=" and then a value with no spaces:

Group(Word(alphas + "+_-.").setResultsName("keyword") +  Suppress
(Literal ("=")) + Optional(Word(printables)))

Sometimes there is a subject, which is a quoted string. That is easy
enough to get with this:
dblQuotedString(ZeroOrMore(Word(printables) ) )

My problem is combining them into one expression. Either I wind up
with just the subject or I wind up with they keywords and their
values, one of which is:

subject, '"I'

which is clearly not what I want.

Do I scan each line twice, first looking for quotes ?

Thanks




From avekir at gmail.com  Tue May 19 10:42:05 2009
From: avekir at gmail.com (Kirill)
Date: Tue, 19 May 2009 07:42:05 -0700 (PDT)
Subject: P2P text chat engine
References: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>
	<76gn8qF1cliefU1@mid.uni-berlin.de>
Message-ID: <56382643-36d9-436a-9e55-739e82ade7ee@z5g2000vba.googlegroups.com>

On 7 ???, 21:23, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Navanjo schrieb:
>
> > If you have the source code of a p2p text chat engine please send to me
>
> I found that & a pot of gold under my bed. Care to give me your address
> so that I can send it to you?
>
> SCNR,
> Diez

Hello, can you sent it to me ?
avekir at gmail.com
Many thanks!!!


From kyosohma at gmail.com  Tue May 19 10:44:15 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 19 May 2009 07:44:15 -0700 (PDT)
Subject: Advanced Python books?
References: <gusevn$jjd$1@reader1.panix.com>
Message-ID: <bf785711-6214-4be4-a205-4b7521e8c274@b1g2000vbc.googlegroups.com>

On May 18, 3:04?pm, kj <so... at 987jk.com.invalid> wrote:
> I have read a couple of "learn Python"-type books, and now I'm
> looking for some more advanced books on Python, something analogous
> to "Effective Java" or "High-Order Perl". ?I've only been able to
> find "Advanced Python 3 Programming Techniques", which, as far as
> I can tell, is only available as a "Kindle Book". ?(Since I won't
> be buying a Kindle for another few decades, this is not an option
> for me.)
>
> I tried out "Dive into Python", because I was told that it was
> written for people with prior programming experience. ?It's an OK
> book, but I don't find that it is much more advanced than pretty
> much any other "learn Python" book I've seen.
>
> Basically I'm looking for a book that assumes that one has the
> basics of the language down, and instead focuses on standard problems
> of software development, such as application architecture and
> design, prototyping, debugging, profiling and performance-tuning,
> testing, packaging/distribution, extending/embedding, threading
> and IPC, persistence, etc., and on various prototypical cases such
> as command-line utilities, GUI-apps, webapps, database-backed apps,
> simulations, etc.
>
> Granted, it is unlikely that a single book will do justice to all
> these areas, but these are the topics I'm now interested in, from
> the perspective of Python.
>
> Any suggestions?
>
> TIA!
> --
> NOTE: In my address everything before the first period is backwards;
> and the last period, and everything after it, should be discarded.

Hetland's book, "Beginning Python" has a bunch of projects at the end.
It also has a chapter on testing, network programming, extending
python, packaging and more. They're not in depth, but they give you a
taste.

Lutz's "Programming Python" has some pretty in depth projects using
Tkinter. You might find the Python Cookbook helpful or you could just
look at ActiveState's cookbook which is what the book was based on:
http://code.activestate.com/recipes/langs/python/

- Mike


From deets at nospam.web.de  Tue May 19 10:51:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 19 May 2009 16:51:33 +0200
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<gutcdg$3st$4@lust.ihug.co.nz>
	<ac63e27e-2dd9-4c27-ace0-d9e205be7afa@s31g2000vbp.googlegroups.com>
	<gutoh2$b0a$1@lust.ihug.co.nz>
	<5f7f9840-0e17-48fb-acf9-04186fb1b7ab@r3g2000vbp.googlegroups.com>
Message-ID: <77fv7jF1h44coU1@mid.uni-berlin.de>

Jack Trades wrote:

> On May 19, 3:53?am, Lawrence D'Oliveiro <l... at geek-
> central.gen.new_zealand> wrote:
>> In message <ac63e27e-2dd9-4c27-ace0-
>>
>> d9e205be7... at s31g2000vbp.googlegroups.com>, Jack Trades wrote:
>> > On May 19, 12:26 am, Lawrence D'Oliveiro <l... at geek-
>> > central.gen.new_zealand> wrote:
>>
>> >> In message <2904e7de-0a8d-4697-9c44-
>>
>> >> c83bb5319... at s31g2000vbp.googlegroups.com>, Jack Trades wrote:
>> >> > Originally I had the 'data' directory in the same directory as the
>> >> > cgi scripts and was using os.system("svn commit"), however I kept
>> >> > running into weird bugs with this method.
>>
>> >> What bugs?
>>
>> > I'm not 100% sure, but I think it had to do with executable
>> > permissions on the cgi scripts.
>>
>> Possibly your CGI scripts are running as some user like "nobody", which
>> doesn't have the right access to the files/directories. Changing APIs
>> won't help here.
> 
> Thanks for the help, I'll have to look into that further.  If that is
> the case, would setuid be appropriate here?  Or is there a better way
> to give the script the appropriate permissions?
> The only thing that baffles me is that the script works before a
> commit and only sometimes after a commit, if it were an access problem
> wouldn't it fail before the commit as well?

I have had many troubles with SVN + permissions.

My recipe is the following:

 - create (or use) a "subversion"-group
 - make all users (including e.g. www-data) that shall access the SVN
members of this group
 - chown -R the svn-repository so that it belongs to this group
 - chmod g+s -R to the svn-repository, so that the sticky group bit is set.

THis solves the problems for me usually.

Diez


From aotto1968 at t-online.de  Tue May 19 10:52:30 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Tue, 19 May 2009 16:52:30 +0200
Subject: PYTHONPATH on Windows XP module load problem
References: <guubg7$nnk$03$1@news.t-online.com>
	<mailman.390.1242742113.8015.python-list@python.org>
Message-ID: <guuh3f$47k$00$1@news.t-online.com>

MRAB wrote:

> Andreas Otto wrote:
>> Hi,
>> 
>>   I have the following problem using python on windows.
>>   I crated a binary extension called
>> 
>>         pymsgque.dll
>> 
>>   on windows. The same extension works fine on UNIX/Linux.
>> 
>>   The problem is on Windows. The build is no problem
>>   but python is not able to load this extension with
>> 
>>         import pymsgque
>> 
>>   and create the following error:
>> 
>>   Traceback (most recent call last):
>>   File "server.py", line 13, in <module>
>>     import pymsgque
>> ImportError: No module named pymsgque
>> [31906 refs]
>> 
>>   the PYTHONPATH variable has the directory of
>>   pymsgque.dll location
>> 
>>   the build of python and the pymsgque extension was done using
>>         > Microsoft Visual C++ Express Edition
>> 
>>   it seems that I missing something
>> 
>> mfg
>> 
>>   Andreas Otto
> 
> Does this help?
> 
> http://pyfaq.infogami.com/is-a-pyd-file-the-same-as-a-dll

Hi,

  this link is nice but I'm still confused ...

  1. on LINUX I create a "pymsgque.so" and I can load this library
        with "import pymsgque"

  2. in WINDOWS, I expect to create a "pymsgque.dll" and do the
        same as on unix "import pymgque"

        -> is this behaviour is supported or not ???
 
  3. the hint with "*.pyd" is totally new to me and I don't know
        is this the "official" way to use dll's on windows or
        just a hack which works


mfg

  Andreas Otto



From matiassurdi at gmail.com  Tue May 19 10:54:13 2009
From: matiassurdi at gmail.com (Matias Surdi)
Date: Tue, 19 May 2009 16:54:13 +0200
Subject: identifying live hosts on a network
In-Reply-To: <069f821d-1b73-4ed9-b298-09e7c0548122@p6g2000pre.googlegroups.com>
References: <069f821d-1b73-4ed9-b298-09e7c0548122@p6g2000pre.googlegroups.com>
Message-ID: <guuh6l$t8e$1@ger.gmane.org>

hunteroakesgun at gmail.com escribi?:
> HI
> I am new to python and am having trouble coming up with a script that
> idenifies all the live hosts on my network.
> thanks Hunter


I've done this in the past with the great help of nmap:

# nmap -sP 192.168.0.0/23

this will find hosts "alive" from 192.168.0.1 to 192.168.1.254

 From python, you can use it by saving it's output to a file and then 
reading or with the help of os.popen.


In this case, "alive" means that the hosts with the ip being analyzed 
responds to ARPs. see the manpage for nmap.

Matias.








From laurentluce49 at yahoo.com  Tue May 19 10:55:44 2009
From: laurentluce49 at yahoo.com (Laurent Luce)
Date: Tue, 19 May 2009 07:55:44 -0700
Subject: strip char from list of strings
References: <195055.64779.qm@web54204.mail.re2.yahoo.com>
	<mailman.372.1242718327.8015.python-list@python.org>
Message-ID: <guuh5b$1s4$1@services.telesweet.net>

I had a simple loop stripping each string but I was looking for
something concise and efficient. I like the following answer:
x = [s.rstrip('\n') for s in x]

David Stanek wrote:
> On Mon, May 18, 2009 at 3:30 PM, Laurent Luce <laurentluce49 at yahoo.com> wrote:
>> I have the following list:
>>
>> [ 'test\n', test2\n', 'test3\n' ]
>>
>> I want to remove the '\n' from each string in place, what is the most efficient way to do that ?
>>
> 
> What have you tried so far?
> 


From laurentluce49 at yahoo.com  Tue May 19 10:56:35 2009
From: laurentluce49 at yahoo.com (Laurent Luce)
Date: Tue, 19 May 2009 07:56:35 -0700
Subject: strip char from list of strings
References: <mailman.371.1242718187.8015.python-list@python.org>
	<e2c96842-552a-41d3-80c7-818d5ec09084@f16g2000vbf.googlegroups.com>
Message-ID: <guuh6t$1oq$1@services.telesweet.net>

Thanks Casey. I like your solution.

Casey Webster wrote:
> On May 18, 3:30 pm, Laurent Luce <laurentluc... at yahoo.com> wrote:
>> I have the following list:
>>
>> [ 'test\n', test2\n', 'test3\n' ]
>>
>> I want to remove the '\n' from each string in place, what is the most efficient way to do that ?
>>
>> Regards,
>>
>> Laurent
> 
> Do you _really_ need to do this in place?  If not, the simplest answer
> is probably:
> 
>>>> x = ['test\n', test2\n', 'test3\n']
>>>> x = [s.rstrip('\n') for s in x]
> 
> And if what you really want to do is strip off all trailing whitespace
> (tabs, spaces, and newlines), then:
> 
>>>> x = [s.rstrip() for s in x]
> 
> A quick test of 1,000,000 strings of length 27 took less than 0.2
> seconds on my PC.  Efficiency isn't really much of an issue for most
> data sets.


From manu3d at gmail.com  Tue May 19 11:15:38 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Tue, 19 May 2009 08:15:38 -0700 (PDT)
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
	<4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>
Message-ID: <3b84542c-7746-498d-8d9e-977deaecfc1d@r3g2000vbp.googlegroups.com>

On May 19, 6:50?am, Stefan Behnel <stefan... at behnel.de> wrote:
> It's pretty easy to write unmaintainable code that uses the DOM API, though.

I'm finding that at my own expenses...

Why would anybody want to use the DOM? I suppose the main reason is
that it is one of the most reliable standards around. It might be more
complicated, but that's probably because lots of very smart people
thought about it very carefully and it couldn't be made any simpler.
And hopefully will stand the test of time.

Anyway. Any taker on the original (very python-related rather than DOM
related) problem at hand?

Manu


From lists at cheimes.de  Tue May 19 11:18:17 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 19 May 2009 17:18:17 +0200
Subject: PYTHONPATH on Windows XP module load problem
In-Reply-To: <guuh3f$47k$00$1@news.t-online.com>
References: <guubg7$nnk$03$1@news.t-online.com>	<mailman.390.1242742113.8015.python-list@python.org>
	<guuh3f$47k$00$1@news.t-online.com>
Message-ID: <4A12CDB9.9020501@cheimes.de>

Andreas Otto wrote:
>   1. on LINUX I create a "pymsgque.so" and I can load this library
>         with "import pymsgque"
> 
>   2. in WINDOWS, I expect to create a "pymsgque.dll" and do the
>         same as on unix "import pymgque"
> 
>         -> is this behaviour is supported or not ???
>  
>   3. the hint with "*.pyd" is totally new to me and I don't know
>         is this the "official" way to use dll's on windows or
>         just a hack which works

The suffix of Python extension has changed over time. It used to be .dll
but starting with Python 2.5 only .pyd files are imported. A .pyd file
is an ordinary, renamed dll file.

Christian


From mypromise at sina.com  Tue May 19 11:30:50 2009
From: mypromise at sina.com (zhouhaifeng)
Date: Tue, 19 May 2009 23:30:50 +0800
Subject: how to get the spesific line of the text in the clipboard 
In-Reply-To: <mailman.1476.1242744869.8014.python-list@python.org>
References: <mailman.1476.1242744869.8014.python-list@python.org>
Message-ID: <4A12D0AA.9060407@sina.com>

I want to get the eighth line in the text of the text in the clipboad, 
but when I call  GetClipboardData
I only get a string, how can I repair it?

thanks   a lot.

My code is here :
 try:       
            win32clipboard.OpenClipboard(hWnd)
            #win32api.Sleep(500)
            text = win32clipboard.GetClipboardData(win32con.CF_TEXT)
            #win32clipboard.EmptyClipboard()
            win32clipboard.CloseClipboard()

            logging.info(len(text))
          
            return text
        except Exception, exc:
            logging.info(exc)


...


def get_file_title(filename):
    f = file(filename)
    #f = open(filename, encoding='gb2312', mode='w+')
    title = u""
    line_count = 0
    for line in f:
        line_count = line_count + 1
        if line_count == 8:                           
<----------------------------now I write the text of the clipboard into 
file, and then read it from file, at this time, I can get line 8 , but 
it so low efficiency
            title = unicode(line, 'gb2312', 'ignore')
            title = title.replace("\r\n", '')
            break
    return title



From nkamado at gmail.com  Tue May 19 11:33:13 2009
From: nkamado at gmail.com (=?ISO-2022-JP?B?GyRCM3lFWjUtTkkbKEI=?=)
Date: Wed, 20 May 2009 00:33:13 +0900
Subject: I was able to use pyInstaller as a python library
Message-ID: <4A12D139.4040001@gmail.com>

Hello, Everyone.

I was able to use pyInstaller as a python library

http://moco.sakura.ne.jp/pyInstaller.zip

and This library test code is available in

http://moco.sakura.ne.jp/pyi_test.zip

This library implements only a function to output windows binary.
and I don't add the change to the contents of the pyinstaller
directory.

Thanking you in advance.

// Noriyoshi Kamado : nkamado at gmail.com




From cournape at gmail.com  Tue May 19 11:40:28 2009
From: cournape at gmail.com (David Cournapeau)
Date: Wed, 20 May 2009 00:40:28 +0900
Subject: Package problem
In-Reply-To: <200905191329.48531.a.cavallo@cavallinux.eu>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
	<5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
	<200905191329.48531.a.cavallo@cavallinux.eu>
Message-ID: <5b8d13220905190840u5cd76323y98c44f5dd724c7e@mail.gmail.com>

On Tue, May 19, 2009 at 9:29 PM, A. Cavallo <a.cavallo at cavallinux.eu> wrote:
>> > It is solved in other languages.. for example perl.. and delphi
>> I don't know much about perl, and even less about delphi, but I am
>> pretty sure it does not solve the problem of overwriting files from a
>> package with an installation outside the control of the package
>> manager.
>
> On a sytem a possible solution would be:
>
> ?/usr/lib/python2.5/site-package/foobar <- The os managed one
> ?/usr/lib/python2.5/site-package/foobar-2.0 <- The alternatives
> ?/usr/lib/python2.5/site-package/foobar-2.1
>
> and using something (in the python interpreter)
>
> import foobar (imports the foobar)
> import foobar requires >= 2.1 (imports foobar 2.1 or above)

This does not solve the discussed problem. If you revwrite foobar-2.0
with foobar-2.0 installed from sources, you don't know whether you
will break the system. You will most likely do so, because of
difference filesystem conventions, for example. And what will happen
when you will do apt-get remove foobar-2.0 (on a .deb system) ? Most
likely, as the set of files installed from sources are not exactly the
same as the set of files installed by dpkg, the uninstall will be
broken. Specially in the case of configuration files, or daemon, this
may be quite serious.

>>
>> There is no simple solution to the following situation:
>> ? ?- install setuptools from ubuntu -> files get into /usr
>> (/usr/lib/python2.5/site-packages, etc...)
>
> setuptools is the problem;) It tries to do too many things imho.

The discussion has nothing to do with setuptools, or even python for
that matter. The problem is that overwriting files managed by the
software management system without its consent is bound to be broken,
on any system (including windows). That's why you should avoid
installing from sources into the locations managed by the OS, be it
/usr for unix, or C:\Windows on windows, etc...

David


From Scott.Daniels at Acm.Org  Tue May 19 11:44:06 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 19 May 2009 08:44:06 -0700
Subject: PYTHONPATH on Windows XP module load problem
In-Reply-To: <guuh3f$47k$00$1@news.t-online.com>
References: <guubg7$nnk$03$1@news.t-online.com>
	<mailman.390.1242742113.8015.python-list@python.org>
	<guuh3f$47k$00$1@news.t-online.com>
Message-ID: <SbSdncYZUsrgT4_XnZ2dnUVZ_s2dnZ2d@pdx.net>

Andreas Otto wrote:
>> Does this help?
>> http://pyfaq.infogami.com/is-a-pyd-file-the-same-as-a-dll
>
>   this link is nice but I'm still confused ...
> 
>   1. on LINUX I create a "pymsgque.so" and I can load this library
>         with "import pymsgque"
And my bathroom is covered in wallpaper.

>   2. in WINDOWS, I expect to create a "pymsgque.dll" and do the
>         same as on unix "import pymgque"
Surprise, surprise, surprise.  Your expectations do not match reality.
Why not expect to copy "pymsgque.so" over to Windows, as long as you
are busy expecting things?

>         -> is this behaviour is supported or not ???
>  
>   3. the hint with "*.pyd" is totally new to me and I don't know
>         is this the "official" way to use dll's on windows or
>         just a hack which works

Yes, this is the official way.  The .pyd extension is a way of
stating a claim that the code follows the Python C module conventions.
Windows has certain conventions about the behavior of .dll files that
interfere with making these modules .dlls.

In case you are curious about the snarky attitude:
    (0) You asked a question.
    (1) You got an informative answer which allowed you to succeed.
    (2) You then explained what you expect to work; something you
        _know_ by experience does not work, and ask if it is supported.

Up until step 2, I was on your side.  To follow with a question asking
if something "totally new to you" is "just a hack which works," when
your only alternative is the behavior you expected to work leaves me
thinking you trust the knowledge you gain from introspection over that
from experimentation or research.

Further, if you built modules using the suggested method, (writing a
setup.py, using "python setup.py build"; "python setup.py install",
you would discover, by what I would guess to be your astonishment, that
a .pyd file got put in site-packages or wherever.


--Scott David Daniels
Scott.Daniels at Acm.Org


From hv at tbz-pariv.de  Tue May 19 11:48:58 2009
From: hv at tbz-pariv.de (Thomas Guettler)
Date: Tue, 19 May 2009 17:48:58 +0200
Subject: Advanced Python books?
In-Reply-To: <gusevn$jjd$1@reader1.panix.com>
References: <gusevn$jjd$1@reader1.panix.com>
Message-ID: <77g2nbF1h267rU1@mid.individual.net>

kj schrieb:
> I have read a couple of "learn Python"-type books, and now I'm
> looking for some more advanced books on Python,
...
> Basically I'm looking for a book that assumes that one has the
> basics of the language down, and instead focuses on standard problems
> of software development, such as application architecture and
> design, prototyping, debugging, profiling and performance-tuning,
> testing, packaging/distribution, extending/embedding, threading
> and IPC, persistence, etc., and on various prototypical cases such
> as command-line utilities, GUI-apps, webapps, database-backed apps,
> simulations, etc.

I think there is no such book. Maybe the Python Cookbook comes near.

webapps: I use django, other use turbogears, other even different stuff...
There are several books about e.g. django. It would be hard to
put all the magic of all web apps into one chapter.

GUI-apps: You can use tkinter, qt or gtk.... again it would be hard
to put something useable into one chapter.

   Thomas

-- 
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de


From __peter__ at web.de  Tue May 19 11:57:30 2009
From: __peter__ at web.de (Peter Otten)
Date: Tue, 19 May 2009 17:57:30 +0200
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
Message-ID: <guukt4$bij$00$1@news.t-online.com>

Emanuele D'Arrigo wrote:

> This is all good and dandy and it works, mostly. However, if you look
> at the code below for the method __getattr__, it appears to be
> attempting to prevent direct access to -any- variable starting with an
> underscore.
> 
>     def __getattr__(self, key):
>         if key[:1]=='_':
>             raise AttributeError, key
> 
> But access isn't actually prevented because __getattr__ is invoked -
> only- if an attribute is not found by normal means. So, is it just me
> or that little snipped of code either has another purpose or simply
> doesn't do the intended job?

It doesn't do what you think it does; it is there to prevent "infinite" 
recursion. Have a look at the complete method:

>     def __getattr__(self, key):
>         if key[:1]=='_':
>             raise AttributeError, key
>         try:
>             getter= getattr(self, '_get_'+key)
>         except AttributeError:
>             raise AttributeError, key
>         return getter()

If you instantiate the object and try to access the -- non-existent -- 
attribute yadda __getattr__() will be called with key="yadda" which doesn't 
start with an underscore and with gettattr(self, "_get_yadda") triggers 
another __getattr__() call as _get_yadda doesn't exist either. If the check 
weren't there yet another getattr(self, "_get__get_yadda") call would 
follow, and so on until the recursion limit is reached.

Peter



From grahn+nntp at snipabacken.se  Tue May 19 12:00:20 2009
From: grahn+nntp at snipabacken.se (Jorgen Grahn)
Date: 19 May 2009 16:00:20 GMT
Subject: Which C compiler?
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>
	<4a11092f$0$30903$9b622d9e@news.freenet.de>
	<1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>
	<mailman.355.1242686909.8015.python-list@python.org>
Message-ID: <slrnh15lso.2c4.grahn+nntp@frailea.sa.invalid>

On Mon, 18 May 2009 15:47:41 -0700, norseman <norseman at hughes.net> wrote:

> I suspect that if all python users were in the same room and the 
> question "Are you NOT happy with python's upgrade requirements?" was 
> asked you would find most hands in the air.  I have said it before - the 
> current attitude of 'new means we start over' was what nearly destroyed 
> Apple. Doesn't take joe public long to get tired of constantly 
> re-buying, re-writing themselves, re-hiring the same people to re-write 
> the same thing, etc...

I dislike the "bleeding edge" aspect of Python culture too, but (as
long as everyone ignores Python 3.0) it's not really something which
hurts me in my daily life. *Not* using Python would hurt, though.

I'm on Linux though, and use no third-party modules which haven't
already been filtered by Debian's maintainers. I don't know if that's
the reason, but my applications rarely or never break.  So I'm not
quite sure what happened in your case ...

/Jorgen

-- 
  // Jorgen Grahn <grahn@        Ph'nglui mglw'nafh Cthulhu
\X/     snipabacken.se>          R'lyeh wgah'nagl fhtagn!


From google at mrabarnett.plus.com  Tue May 19 12:08:38 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 19 May 2009 17:08:38 +0100
Subject: how to get the spesific line of the text in the clipboard
In-Reply-To: <4A12D0AA.9060407@sina.com>
References: <mailman.1476.1242744869.8014.python-list@python.org>
	<4A12D0AA.9060407@sina.com>
Message-ID: <4A12D986.4050900@mrabarnett.plus.com>

zhouhaifeng wrote:
> I want to get the eighth line in the text of the text in the clipboad, 
> but when I call  GetClipboardData
> I only get a string, how can I repair it?
> 
> thanks   a lot.
> 
> My code is here :
> try:                  win32clipboard.OpenClipboard(hWnd)
>            #win32api.Sleep(500)
>            text = win32clipboard.GetClipboardData(win32con.CF_TEXT)
>            #win32clipboard.EmptyClipboard()
>            win32clipboard.CloseClipboard()
> 
>            logging.info(len(text))
>                     return text
>        except Exception, exc:
>            logging.info(exc)
> 
[snip]

Split the string into lines and take the eighth line (at index 7). I've
limited the number of splits to 8 because I'm not interested in any of
the following lines:

     line = text.split("\r\n", 8)[7]



From showell30 at yahoo.com  Tue May 19 12:08:41 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 19 May 2009 09:08:41 -0700 (PDT)
Subject: UDP reading on multiple sockets
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net> 
	<15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>
	<27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
Message-ID: <18a04f46-4b9d-4bf2-a6e2-5f93ab1a86ee@w35g2000prg.googlegroups.com>

On May 18, 6:19?am, thomas.vo... at likeabird.de wrote:
> On 17 Mai, 04:22, Grant Edwards <gra... at visi.com> wrote:
>
> > On 2009-05-17, Thomas Vogel <thomas.vo... at likeabird.de> wrote:
>
> > > I'm currently have the problem that I try to read UDP messages from
> > > multiple sockets in parallel. So let's say I get UDP packets from the
> > > same IP on the ports 2000, 2001, 2002,...
>
> > Is there any reason you can't do it the easy way by using
> > select?
>
> >http://docs.python.org/library/select.html
>
> > --
> > Grant
>
> The only honest answer would be that I'm totaly unfamiliar with select
> and also the documentation I found wasn't able to clear the picture.
> So are there examples of using select together with sockets available?
>

My two cents on this issue is that you should stick with asyncore for
now and just figure out how to debug better what's going on.

I understand the rationale behind the alternatives--there are
certainly advantages (even in debugging) to using something closer to
the metal, like select, or in using something that might be a better
abstraction, like Twisted.

But really, if you look at the source code for asyncore, it's just a
thin layer on top of select.select, and the entire module is under 600
lines of code.  Asyncore is much maligned, and there are some
legitimate beefs with it, but it does well, for the most part, what it
intends to do, which is to solve some of the more difficult, or at
least tedious, problems with regards to dealing with select.select.

My fear is that if you try to do this without asyncore, via select,
you'll end up reinventing lots of asyncore with lots of your own
bugs.  I have less fear about going higher in the stack, except that
it just puts another layer on top of the problem, and I think the
issue you're dealing with is fairly low-level.

So my suggestion is to figure out a good debugging strategy, either by
getting a bit more familiar with asyncore internals (with a debugger,
print statements, analysis, etc.), or by better using system tools
(like snoop, truss, etc.) to see what's happening at the I/O level, or
both.

Good luck!



Steve




From grahn+nntp at snipabacken.se  Tue May 19 12:11:33 2009
From: grahn+nntp at snipabacken.se (Jorgen Grahn)
Date: 19 May 2009 16:11:33 GMT
Subject: strip char from list of strings
References: <mailman.371.1242718187.8015.python-list@python.org>
	<m263fxcxds.fsf@cs.uu.nl>
Message-ID: <slrnh15mhp.2c4.grahn+nntp@frailea.sa.invalid>

On Tue, 19 May 2009 10:25:35 +0200, Piet van Oostrum <piet at cs.uu.nl> wrote:
>>>>>> Laurent Luce <laurentluce49 at yahoo.com> (LL) wrote:
>
>>LL> I have the following list:
>
>>LL> [ 'test\n', test2\n', 'test3\n' ]
>
>>LL> I want to remove the '\n' from each string in place, what is the
>>LL> most efficient way to do that ? 
>
> I suppose you mean you have lists similar to the one given because with
> a list of 3 elements efficiency is a non-issue unless you do something
> stupid or repeat the operation thousands of times. Even with a list of
> 1000 elements efficiency isn't very important. In fact you should worry
> about efficiency only after there are signs that there might be a
> problem. 
>
> Secondly, in Python you cannot remove a character from a string in place
> if that means modifying the string. Strings are immutable.

So the best way is probably to make sure the '\n's do not end up in
the list in the first place. I suspect that is often more elegant too.

/Jorgen

-- 
  // Jorgen Grahn <grahn@        Ph'nglui mglw'nafh Cthulhu
\X/     snipabacken.se>          R'lyeh wgah'nagl fhtagn!


From deets at nospam.web.de  Tue May 19 12:16:11 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 19 May 2009 18:16:11 +0200
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
	<4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>
	<3b84542c-7746-498d-8d9e-977deaecfc1d@r3g2000vbp.googlegroups.com>
Message-ID: <77g46cF1h8ffnU1@mid.uni-berlin.de>

Emanuele D'Arrigo wrote:

> On May 19, 6:50?am, Stefan Behnel <stefan... at behnel.de> wrote:
>> It's pretty easy to write unmaintainable code that uses the DOM API,
>> though.
> 
> I'm finding that at my own expenses...
> 
> Why would anybody want to use the DOM? I suppose the main reason is
> that it is one of the most reliable standards around. It might be more
> complicated, but that's probably because lots of very smart people
> thought about it very carefully and it couldn't be made any simpler.
> And hopefully will stand the test of time.

Sorry to say so, but that's nonsense. DOM is not complicated because it
contains anything superior - the reason (if any) is that it is formulated
as language-agnostic as possible, with the unfortunate result it is rather
clumsy to use in all languages.

Additionally, it *attempts* to unify APIs in browsers, unfortunately it is
only moderately successful.

APIs such as ElementTree don't try to burden themselves with the
language-agnosticism, and thus are much more powerful.

And no, I don't think being language-agnostic is a virtue in an API. Simply
because this can never really be reached, and then is questionable anyway.

Diez


From python.list at tim.thechases.com  Tue May 19 12:18:41 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 19 May 2009 11:18:41 -0500
Subject: how to get the spesific line of the text in the clipboard
In-Reply-To: <4A12D986.4050900@mrabarnett.plus.com>
References: <mailman.1476.1242744869.8014.python-list@python.org>	<4A12D0AA.9060407@sina.com>
	<4A12D986.4050900@mrabarnett.plus.com>
Message-ID: <4A12DBE1.8030108@tim.thechases.com>

>> I want to get the eighth line in the text of the text in the clipboad, 
>> but when I call  GetClipboardData
>> I only get a string, how can I repair it?
> [snip]
> 
> Split the string into lines and take the eighth line (at index 7). I've
> limited the number of splits to 8 because I'm not interested in any of
> the following lines:
> 
>      line = text.split("\r\n", 8)[7]

Strings have a .splitlines() method that makes this a little more 
elegant:

   line = text.splitlines()[7]

-tkc






From manu3d at gmail.com  Tue May 19 12:24:45 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Tue, 19 May 2009 09:24:45 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
	<fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com> 
	<d3631430-f8b9-42ce-af42-df4f3c5ef186@o14g2000vbo.googlegroups.com> 
	<ad04c939-ff12-4543-9fc5-8a099e99ed0e@x6g2000vbg.googlegroups.com> 
	<9b5ecc41-532d-460b-a552-bf99cc9c095d@u10g2000vbd.googlegroups.com> 
	<758b4300-b522-40ed-81bf-4cc824284f6c@s31g2000vbp.googlegroups.com> 
	<d52b1ce8-0ad7-41a3-9edb-eb3ef6ebeb21@b1g2000vbc.googlegroups.com>
Message-ID: <1458c81d-8908-40fd-9d70-d34523cc42eb@o30g2000vbc.googlegroups.com>

Hello Paul, sorry for the long delay, I was trying to wrap my mind
around DOM and Events implementations...

On May 15, 7:08?pm, Paul Boddie <p... at boddie.org.uk> wrote:
> Another implementation is probably a good thing, though, since I don't
> trust my own interpretation of the specifications. ;-)

Tell me about it. In general I like the work the W3C is doing, but
some things could use a little less freedom and a little more clarity.
=) But then again, maybe it's for the best to leave things as they are
so that we can figure it out for ourselves.

> > Why shouldn't the listeners be stored directly on the EventTarget?
>
> One reason for this might well be due to the behaviour of libxml2 and
> libxml2dom: if I visit the same node in a document twice, obtaining a
> node instance each time, these two instances will be different;

Mmmm.... I don't know the specifics of libxml... are you saying that
once the object tree is created out of an XML file, requesting twice
the same node object -does not- result in a pointer to the same
instance in memory? How's that possible?

> The libxml2dom.svg module has classes which inherit from EventTarget.

And what does the EventTarget inherit from? Or are those classes
inheriting
from both Nodes and EventTargets?

> What I've tried to do is to make submodules to address particular
> formats and document models.

I think the issue to consider there is that the DOM does not restrict
a document from being a mush-up of multiple formats. I.e. it should be
possible to have XHTML and SVG tags in the same document. As long as
those modules work at element/tag level and do not obstruct each other
I think you are on the right track!

> I think that if I were to expose an event-capable DOM, other than that
> provided for SVG, I would just have a specific submodule for that
> purpose.

Ultimately I found it moderately easier to modify pxdom with the
intention of releasing "pxdome", a fork of pxdom. Monkey-patching
pxdom seemed to be a little too tricky and prone to error to create a
separate module.

> > > One of my tests tries to exercise the code, but I might be doing it
> > > all completely wrong:
> > >https://hg.boddie.org.uk/libxml2dom/file/91c0764ac7c6/tests/svg_event...

I had a more in-depth look after having spent the weekend trying to
wrap my head around all sorts of implementation issues.

My understanding, also after a few exchanges in the www-dom at w3.org
mailing-list, is that initialization of an event can happen wherever
you feel like doing it, except in Document.createEvent(). I.e. it
could be a method on the event itself or an external function. In your
code however, I believe the initialization method should be
initMouseEventNS() rather then initEventNS() and the namespace for DOM
3 Events should be -None-. Between the two implementations the first
one seems to be more aligned with the DOM documentation.

The way I'm doing it is that I invoke Document.createEvent(eventType),
I initialize the resulting event in part manually and in part with
type-related default settings and I finally use
Document.pxdomTriggerEvent(event) to create a propagation path and
iterate through its targets. I.e.:

def _trigger_DOMSubtreeModified(target):

  relevantTargetTypes = (Node.DOCUMENT_NODE,
Node.DOCUMENT_FRAGMENT_NODE,
                         Node.ELEMENT_NODE, Node.ATTRIBUTE_NODE)

  if target.nodeType not in relevantTargetTypes:
    return

  if target.ownerDocument:
    event = target.ownerDocument.createEvent("MutationEvent")

    event._target = target

    target.ownerDocument.pxdomEventDefaultInitNS(None,
"DOMSubtreeModified", event)
    target.ownerDocument.pxdomTriggerEvent(event)

Notice that I'm currently keeping this function as a loose function
but it could very well be placed as a method in the Document class or
in each relevant classes. I'm not sure why one option would be better
than all others and the DOM doesn't specify it.

The dispatch of the event to each target on the propagation path is
also a matter of implementation. In the discussion in www-dom three
options have emerged: 1) the Document node establishes the propagation
path and iterates through the targets listed to dispatch the event to
each 2) an unspecified, external object does the same job 3) the
propagation path is established, stored on the event and each event
target is responsible for recursively dispatching the event to the
next target if propagation hasn't been stopped.  Apparently an earlier
version of Mozilla's Gecko used option 3 but they eventually switched
to option 1. Again, it's unclear in what circumstances to use one
option or the other.

What I don't know at this time is how to merge all this with the
specific file formats such as SVG and HTML. I.e. in an SVG example, do
I create a GroupElement(Element) class and I override the
Document.createElement() method to create an instance of it any time a
<g> element is found in the input file? Or do I first create an
application-neutral DOM tree out of the input file and I then
instantiate a parallel application-specific structure, holding the
objects that provide methods to actually draw and group shapes? If I
get an answer from www-dom I'll report it here...

Manu



From jkrukoff at ltgc.com  Tue May 19 12:25:49 2009
From: jkrukoff at ltgc.com (John Krukoff)
Date: Tue, 19 May 2009 10:25:49 -0600
Subject: Best library to make XSLT 2.0 transformation
In-Reply-To: <77fk56F1fg5c6U1@mid.uni-berlin.de>
References: <7fa6e7f2-00ae-4b9b-86a2-0ce62b9914d1@q14g2000vbn.googlegroups.com>
	<77fk56F1fg5c6U1@mid.uni-berlin.de>
Message-ID: <1242750349.13846.10.camel@localhost.localdomain>

On Tue, 2009-05-19 at 13:42 +0200, Diez B. Roggisch wrote:
> wdveloper wrote:
> 
> > Hi there,
> > 
> > I need to make xml transformation using XSLT 2.0 (since i want to use
> > the powerful tag <xsl:result-document> to produce multiple files).
> > In your experience, which kind of library out there is better?
> 
> XSLT is a standard, so if you find a library that implements it, there
> shouldn't be much differences.
> 
> Having said that, these days lxml2 is the craze, and it contains
> xslt-processing. It would be my first (and hopefully last) stop.
> 
> Diez

While I firmly believe lxml is the best python XML library available,
being built on libxml2 means that it only supports XSLT 1.0. As far as I
know, if you want 2.0 support, you still need to be using one of the
Java XSLT processors.
-- 
John Krukoff <jkrukoff at ltgc.com>
Land Title Guarantee Company



From google at mrabarnett.plus.com  Tue May 19 12:34:57 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 19 May 2009 17:34:57 +0100
Subject: how to get the spesific line of the text in the clipboard
In-Reply-To: <4A12DBE1.8030108@tim.thechases.com>
References: <mailman.1476.1242744869.8014.python-list@python.org>	<4A12D0AA.9060407@sina.com>
	<4A12D986.4050900@mrabarnett.plus.com>
	<4A12DBE1.8030108@tim.thechases.com>
Message-ID: <4A12DFB1.4030109@mrabarnett.plus.com>

Tim Chase wrote:
>>> I want to get the eighth line in the text of the text in the 
>>> clipboad, but when I call  GetClipboardData
>>> I only get a string, how can I repair it?
>> [snip]
>>
>> Split the string into lines and take the eighth line (at index 7). I've
>> limited the number of splits to 8 because I'm not interested in any of
>> the following lines:
>>
>>      line = text.split("\r\n", 8)[7]
> 
> Strings have a .splitlines() method that makes this a little more elegant:
> 
>   line = text.splitlines()[7]
> 
I thought it split only on "\n". Turns out it can handle "\r\n" too!
Yay! :-)


From gabriel.rossetti at arimaz.com  Tue May 19 12:52:14 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Tue, 19 May 2009 18:52:14 +0200
Subject: UDP reading on multiple sockets
In-Reply-To: <27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net>
	<15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>
	<27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
Message-ID: <4A12E3BE.20006@arimaz.com>

thomas.vogel at likeabird.de wrote:
> On 17 Mai, 04:22, Grant Edwards <gra... at visi.com> wrote:
>   
>> On 2009-05-17, Thomas Vogel <thomas.vo... at likeabird.de> wrote:
>>
>>     
>>> I'm currently have the problem that I try to read UDP messages from
>>> multiple sockets in parallel. So let's say I get UDP packets from the
>>> same IP on the ports 2000, 2001, 2002,...
>>>       
>> Is there any reason you can't do it the easy way by using
>> select?
>>
>> http://docs.python.org/library/select.html
>>
>> --
>> Grant
>>     
>
> The only honest answer would be that I'm totaly unfamiliar with select
> and also the documentation I found wasn't able to clear the picture.
> So are there examples of using select together with sockets available?
>
> Kind regards
> Thomas
>   
You could also try Twisted : http://twistedmatrix.com/trac/

Best,
Gabriel


From aahz at pythoncraft.com  Tue May 19 13:00:37 2009
From: aahz at pythoncraft.com (Aahz)
Date: 19 May 2009 10:00:37 -0700
Subject: python3 module for dbus ?
References: <4a1281ef$0$90271$14726298@news.sunsite.dk>
Message-ID: <guuojl$l9g$1@panix3.panix.com>

In article <4a1281ef$0$90271$14726298 at news.sunsite.dk>,
Timothy Madden  <terminatorul at gmail.com> wrote:
>
>Sorry if this is not the right newsgroup for python modules, I found no 
>other appropriate one.

You're in the right place!

>I would like to start a project in python and I think it would be good 
>to start with python3.0, but I need tu use glib, dbus, wxWidgets and 
>postgresql.
>
>Do you know if I can get dbus bindings for python3 and glib bindings for 
>python3 ? Or could I use them otherwise (like without the modules) ?

Sorry, no answers to your questions off-hand, but what's wrong with
using 2.x?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From norseman at hughes.net  Tue May 19 13:02:56 2009
From: norseman at hughes.net (norseman)
Date: Tue, 19 May 2009 10:02:56 -0700
Subject: Which C compiler?
In-Reply-To: <slrnh15lso.2c4.grahn+nntp@frailea.sa.invalid>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>	<4a11092f$0$30903$9b622d9e@news.freenet.de>	<1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>	<mailman.355.1242686909.8015.python-list@python.org>
	<slrnh15lso.2c4.grahn+nntp@frailea.sa.invalid>
Message-ID: <4A12E640.9000905@hughes.net>

Jorgen Grahn wrote:
> On Mon, 18 May 2009 15:47:41 -0700, norseman <norseman at hughes.net> wrote:
> 
>> I suspect that if all python users were in the same room and the 
>> question "Are you NOT happy with python's upgrade requirements?" was 
>> asked you would find most hands in the air.  I have said it before - the 
>> current attitude of 'new means we start over' was what nearly destroyed 
>> Apple. Doesn't take joe public long to get tired of constantly 
>> re-buying, re-writing themselves, re-hiring the same people to re-write 
>> the same thing, etc...
> 
> I dislike the "bleeding edge" aspect of Python culture too, but (as
> long as everyone ignores Python 3.0) it's not really something which
> hurts me in my daily life. *Not* using Python would hurt, though.
> 

agreed! emphatically so

> I'm on Linux though, and use no third-party modules which haven't
> already been filtered by Debian's maintainers. I don't know if that's
> the reason, but my applications rarely or never break.  So I'm not
> quite sure what happened in your case ...
> 

Linux, me too.  MY apps, same.   Coupling to vendor apps - busted.

> /Jorgen
> 

I cannot speak for the OP, but I have run into version problems as a 
result of dealing with purchased applications that use python as the (or 
one of the allowed) scripting languages for user written tweaks. As an 
example I'll use fictitious Company-One that released 9.1 which had no 
python. Then they released 9.2 which came with python 2.4 and then they 
released 9.3 which came with python 2.5(.1) plus the other languages 
like VBA that have been there all along. A program NOT using Company-One 
hooks but rather just the python itself (as in a small scientific 
calculator for use 'on the side') which was written in 2.4 will not run 
on 2.5. Who knows why. (The first error noted had to do with version 
miss-match.) It's these types of inconsistencies that are annoying. 
Since the place I work converted to Company-One's 9.3 and someone fixed 
the calculator to run on 2.5, I left the research into what might be the 
actual problem in a file somewhere. I believe it was a circular file. :)
I have my own calculator so I don't use the other one anyway.  :)

That scenario is probably the norm for most companies with more than one 
individual in them who use purchased applications and write in-house 
'scripts'.  The lack of upward compatibility is always annoying.

In all fairness to Python, it is not nearly as bad as VBA when it comes 
to breaking.  VBA quits when the OS version changes, when the VBA 
version changes, when the VB6 version changes.  It also seems to break 
each time sneeze. :)  Whereas when a given version of Python is loaded 
on both Linux and Windows I can samba a drive and use the same single 
one and only one file on both OSs at the same time if I wish, with the 
same certainty.  All except the fonts.  Three different Window machines 
all running the same OS release/patches and I get three different 
results for the same mono spaced font.  Go figure.



Steve


From gokhansever at gmail.com  Tue May 19 13:06:04 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Tue, 19 May 2009 12:06:04 -0500
Subject: Question about locals()
In-Reply-To: <pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
Message-ID: <49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>

Thank you all for great explanation on this subject. Maybe a few sentences
from these conversations could be added to locals() documentation.

I will make double sure myself while using locals() to end up with valid
identifiers.

G?khan


On Tue, May 19, 2009 at 1:06 AM, Steven D'Aprano <
steven at remove.this.cybersource.com.au> wrote:

> Sorry for breaking threading, the original post is not being carried by
> my ISP.
>
>
> On Tue, 19 May 2009, G?khan SEVER wrote:
> > Hello,
> >
> > Could you please explain why locals() allow me to create variables that
> > are not legal in Python syntax. Example: locals()['1abc'] = 55. Calling
> > of 1abc results with a syntax error. Shouldn't it be better to raise an
> > error during the variable creation time?
>
> No, because it isn't an error to use '1abc' as a dictionary key.
>
> "locals()['1abc'] = 55" does not create a variable. It creates an object
> 55, a string '1abc', and uses that string as the key in a dict with 55 as
> the value.
>
> "locals()['abc'] = 55" does not create a variable either. It does exactly
> the same thing as above, except that in this case 'abc' happens to be a
> valid identifier.
>
> "abc = 55" also does not create a variable. What it does is exactly the
> same as the above, except that the dictionary key is forced to be a valid
> identifier by the parser (or perhaps the lexer): the parser won't accept
> 1abc as a valid identifier, so you can't execute "1abc = 55".
>
> (Almost... there's actually a slight complication, namely that making
> changes to locals() inside a function does not work.)
>
> Python's programming model is based on namespaces, and namespaces are
> implemented as dictionaries: so-called "variables" are key/value pairs
> inside a dictionary. Just because a dictionary is used as a namespace
> doesn't stop it from being used as a dictionary: you can add any keys/
> values which would otherwise be valid. It's still a dictionary, just like
> any other dictionary.
>
> >>> globals()[45] = None
> >>> globals()
> {'__builtins__': <module '__builtin__' (built-in)>, 45: None, '__name__':
> '__main__', '__doc__': None}
>
>
> As for *why* this is done this way, the answer is simplicity of
> implementation. Dictionaries don't need to care about what counts as a
> valid identifier. Only the lexer/parser needs to care.
>
>
> --
> Steven
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From stefan_ml at behnel.de  Tue May 19 13:14:43 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 19 May 2009 19:14:43 +0200
Subject: Best library to make XSLT 2.0 transformation
In-Reply-To: <7fa6e7f2-00ae-4b9b-86a2-0ce62b9914d1@q14g2000vbn.googlegroups.com>
References: <7fa6e7f2-00ae-4b9b-86a2-0ce62b9914d1@q14g2000vbn.googlegroups.com>
Message-ID: <4a12e902$0$31871$9b4e6d93@newsspool3.arcor-online.net>

wdveloper wrote:
> I need to make xml transformation using XSLT 2.0 (since i want to use
> the powerful tag <xsl:result-document> to produce multiple files).
> In your experience, which kind of library out there is better?

I'm not aware of a Python library that implements XSLT 2.0, although you
might want to look around at the XQuery homepage, which links to a number
of candidates.

That said, if all you want is to generate multiple result documents from a
single XSLT, lxml will happily help you if you take a minute to implement a
custom XSLT element in Python that just writes an XSLT result to a file.

http://codespeak.net/lxml/extensions.html#xslt-extension-elements

Stefan


From jeanmichel at sequans.com  Tue May 19 13:28:42 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 19 May 2009 19:28:42 +0200
Subject: Import and absolute file names, sys.path including ''... or not
Message-ID: <4A12EC4A.4040409@sequans.com>

Hi fellows,

I spent quite a time on a malicious issue. I found out that there is a 
slight difference on the sys.path content when either executing code 
from a shell or from within a script.
This difference is the '' item, which is present in the shell form of 
sys.path.

For instance, let's write this code in test.py:
import sys
print sys.path

shell form:
python
Python 2.4.4 (#2, Oct 22 2008, 19:52:44)
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import test
['', other misc stuff] <- sys.path


script form:
python test.py
[other misc stuff] <- sys.path

The '' item is not here.

Problem is, '' is required for absolute path to be properly resolved. In 
my code I sometimes have to import file in that way : 
__import__('/some/absolute/path')

So the immediate solution is to write this:
if '' not in sys.path:
    sys.path.append('') # make sure absolute path are properly resolved 
in any case

I'm not a big fan of manipulating sys.path at the begining of my files. 
Is there something I'm doing wrong ? Is there a standard/nice way to 
support absolute path ? I guess '' is in fact aimed at resolving 
relative path from the execution directory...

best regards,

Jean-Michel


From suruti94 at gmail.com  Tue May 19 13:32:46 2009
From: suruti94 at gmail.com (Mohan Parthasarathy)
Date: Tue, 19 May 2009 10:32:46 -0700
Subject: Performance java vs. python
Message-ID: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>

On Mon, May 18, 2009 at 5:56 AM, Aahz <aahz at pythoncraft.com> wrote:

> In article <mff7e6-e43.ln1 at satorlaser.homedns.org>,
> Ulrich Eckhardt  <eckhardt at satorlaser.com> wrote:
> >Steve Ferg wrote:
> >>
> >> On the one hand, there are developers who love big IDEs with lots of
> >> features (code generation, error checking, etc.), and rely on them to
> >> provide the high level of support needed to be reasonably productive
> >> in heavy-weight languages (e.g. Java).
> >>
> >> On the other hand there are developers who much prefer to keep things
> >> light-weight and simple.  They like clean high-level languages (e.g.
> >> Python) which are compact enough that you can keep the whole language
> >> in your head, and require only a good text editor to be used
> >> effectively.
> >
> >This distinction is IMHO not correct. If you took a look at Java, you
> would
> >notice that the core language syntax is much simpler than Python's.
>
> That's half-true.  The problem is that you have to digest a much bigger
> chunk of Java before you can start being productive.  Consider how simple
> it is to write a non-regex grep in Python.  In addition, Python's object
> model is simpler than Java's, not even talking about the contortions that
> Java's static class model forces you into.


I am new to Python. I am slowly realizing that Python might be a better
choice when compared to java on the server side. Is there any performance
comparison between Java and Python ? For example, if I use the J2EE solution
vs. python (Django etc.) on the server side, would one perform better over
the other ?

-mohan

P.S: I have changed the subject line to reflect the new thread

>
> --
> Aahz (aahz at pythoncraft.com)           <*>
> http://www.pythoncraft.com/
>
> "In 1968 it took the computing power of 2 C-64's to fly a rocket to the
> moon.
> Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows
> 98.
> Something must have gone wrong."  --/bin/fortune
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From fetchinson at googlemail.com  Tue May 19 13:42:28 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Tue, 19 May 2009 10:42:28 -0700
Subject: Performance java vs. python
In-Reply-To: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
Message-ID: <fbe2e2100905191042g59b7522ajd09353fc88dbcf2e@mail.gmail.com>

>> >> On the one hand, there are developers who love big IDEs with lots of
>> >> features (code generation, error checking, etc.), and rely on them to
>> >> provide the high level of support needed to be reasonably productive
>> >> in heavy-weight languages (e.g. Java).
>> >>
>> >> On the other hand there are developers who much prefer to keep things
>> >> light-weight and simple.  They like clean high-level languages (e.g.
>> >> Python) which are compact enough that you can keep the whole language
>> >> in your head, and require only a good text editor to be used
>> >> effectively.
>> >
>> >This distinction is IMHO not correct. If you took a look at Java, you
>> would
>> >notice that the core language syntax is much simpler than Python's.
>>
>> That's half-true.  The problem is that you have to digest a much bigger
>> chunk of Java before you can start being productive.  Consider how simple
>> it is to write a non-regex grep in Python.  In addition, Python's object
>> model is simpler than Java's, not even talking about the contortions that
>> Java's static class model forces you into.
>
>
> I am new to Python. I am slowly realizing that Python might be a better
> choice when compared to java on the server side. Is there any performance
> comparison between Java and Python ? For example, if I use the J2EE solution
> vs. python (Django etc.) on the server side, would one perform better over
> the other ?

Benchmarks always test for a given feature. The available benchmarks
will most likely not test the feature relevant for your particular
application simply because there are about a gazillion different ways
of using a web framework. So the best you can do is simply test the
bottleneck part of your application and see for yourself, otherwise
you will be left with comments like "django is used at work because
it's faster for us" or "I use j2ee because performance is better for
my web app". When it will come to choosing your framework these will
help little to none.

Cheers,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From norseman at hughes.net  Tue May 19 13:43:45 2009
From: norseman at hughes.net (norseman)
Date: Tue, 19 May 2009 10:43:45 -0700
Subject: Python, Tkinter and popen problem
Message-ID: <4A12EFD1.2090206@hughes.net>

I have come across a problem that, as I understand all documentation I
have found, should not exist.

Python version is 2.5.2, Tinker in that package.
Linux Slackware 10.2

I went to test os.popen and got mixed answers.

         1) IF  os.popen opens a command line or command window type
            THEN  the read and writes work as expected
         2) IF  os.popen opens a Tkinter contained python program
            THEN  the read is not consistant and write to it fails.

OK - #1 runs as expected on shell scripts and other programs that were
         written for the keyboard and redirectors only. (non GUI types)

      #2 popen sometimes connects to stdout OF the child and sometimes
         not and has never shown signs of connection to stdin OF child

The Tkinter usage has three (3) print statements. Two (2) never show up.
One does. The one that does is the exit notice.

In the 'child' program;  print, sys.stdout.write(string), and 
os.write(stdout,string) all work for the one that does write back, but
none work for the two that do not. Don't get picky on the syntax, the
purpose is to get the message across.


The print statements are:
print "Notice of action"
print VariableHavingTextOfAction

print "Closing down\n"

Yes I added the '\n' to the others - no change.

Same loop reads/prints the stdout FROM child in all three cases.

All three work fine when Tkinter included program is run 'solo'.
Print statements show up in the text (command, whatever) window.
The entire Tkinter included program runs normally except for the I/O
linkage problem when using os.popen(.....  or Popen2.popen2 or ... then
only third print shows up in text window. Acts as if first two prints
were captured but never forwarded to screen.  If it was a case of not
sending until a system flush() took place then all three lines would
appear at the closing.  That is NOT happening. Only closing notice appears.

The child has a pause expecting a keystroke from the master immediately
following the print VariableH...   which apparently is never received.


This is a case of Python running a Python program that contains Tkinter.


So what is going on and what can I do?
I want the master to echo the slave's print statements and the slave get
the 'continue' character so it will.

Today is: 20090519
Versions noted above.

Steve



From hackingkk at gmail.com  Tue May 19 14:09:19 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Tue, 19 May 2009 23:39:19 +0530
Subject: Performance java vs. python
In-Reply-To: <fbe2e2100905191042g59b7522ajd09353fc88dbcf2e@mail.gmail.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<fbe2e2100905191042g59b7522ajd09353fc88dbcf2e@mail.gmail.com>
Message-ID: <1242756559.3669.16.camel@kk-laptop>

On Tue, 2009-05-19 at 10:42 -0700, Daniel Fetchinson wrote:
> Benchmarks always test for a given feature. The available benchmarks
> will most likely not test the feature relevant for your particular
> application simply because there are about a gazillion different ways
> of using a web framework. So the best you can do is simply test the
> bottleneck part of your application and see for yourself, <snip>
Bingo! there will be hundreds of threads on this mailing list and many
others which exactly do that.  And it also serves as a great food for
those bashing birds who just need a spart to start a flamewar.

Till date I have worked with both languages into their core as will as
with many libraries for different tasks.

Fortunately I have some assessment for web frameworks which is based
mostly on my personal experience and partially on some obvious facts.

At the outset, I have seen that python's syntax is pritty clean and as
some previous mail said on this thread, it needs just a few hours and
the language is compact enough to fit in your head.
Readers might ask, "so how is this associated with performance boosting
etc?"  
Quite a good question.  You see, the scope for making quick and suttle
changes in the code should be wide enough and easy to do as wel.

Since python has such easy and clean syntax and with the idea of
"battries included ", it is much more quicker and easier to tune the
application for many things including performance.

Since I feel comfortable with the language I am confident enough that my
code won't break too much when I try to do some serious alteration to
the code.  This alteration might now be to change the logic but to
improve performance.  This is the challenge and python is such a
language that manipulating to this level is pritty doable in short
period of time.

Secondly, Java it seems comes with a lot of bagage which might be the
case with python as well.  But some how I don't know, python seems to be
much light weight then java.
May be there are many technical reasons for this and at the web
application side it seems to be compact zippi and fast.  Again this
might be my personal assessment,and specially with database driven
application, no language can be absolutely better than the other and as
rightly suggested, test it on the bottleneck issues and fine tune that
particular part.  I have seen many apps migrating from ejb based
framework to python, particularly one I remember in pylons and the
feedback has been positive.
 
Another thing is that I personally like to use OOP *only* when needed.
Java would force me to write classes (add the over doing with static
functions ) for every thing I do including a small function just for
returning a connection object.

This again is a major reason for me to stick to python.

In addition python also can do the kind of work, j2ME can do and so I
don't think there is any serious reason for choosing java over python.
I am currently developing a major application and it is currently using
the twisted library for xmlrpc and there is a thin client in pygtk.
Right now we are in the process of moving it to turbogears2 and so far
performance on both the ends have been good.

happy hacking.
Krishnakant.



From jeremy at martinfamily.freeserve.co.uk  Tue May 19 14:15:52 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Tue, 19 May 2009 11:15:52 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
Message-ID: <e31643b2-43f1-48a5-b7c6-3930c7232af0@o30g2000vbc.googlegroups.com>

On 19 May, 10:24, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:
> > Let me clarify what I think par, pmap, pfilter and preduce would mean
> > and how they would be implemented.
>
> [...]
>
> Just for fun, I've implemented a parallel-map function, and done a couple
> of tests. Comments, criticism and improvements welcome!
>
> import threading
> import Queue
> import random
> import time
>
> def f(arg): ?# Simulate a slow function.
> ? ? time.sleep(0.5)
> ? ? return 3*arg-2
>
> class PMapThread(threading.Thread):
> ? ? def __init__(self, clients):
> ? ? ? ? super(PMapThread, self).__init__()
> ? ? ? ? self._clients = clients
> ? ? def start(self):
> ? ? ? ? super(PMapThread, self).start()
> ? ? def run(self):
> ? ? ? ? while True:
> ? ? ? ? ? ? try:
> ? ? ? ? ? ? ? ? data = self._clients.get_nowait()
> ? ? ? ? ? ? except Queue.Empty:
> ? ? ? ? ? ? ? ? break
> ? ? ? ? ? ? target, where, func, arg = data
> ? ? ? ? ? ? result = func(arg)
> ? ? ? ? ? ? target[where] = result
>
> class VerbosePMapThread(threading.Thread):
> ? ? def __init__(self, clients):
> ? ? ? ? super(VerbosePMapThread, self).__init__()
> ? ? ? ? print "Thread %s created at %s" % (self.getName(), time.ctime())
> ? ? def start(self):
> ? ? ? ? super(VerbosePMapThread, self).start()
> ? ? ? ? print "Thread %s starting at %s" % (self.getName(), time.ctime())
> ? ? def run(self):
> ? ? ? ? super(VerbosePMapThread, self).run()
> ? ? ? ? print "Thread %s finished at %s" % (self.getName(), time.ctime())
>
> def pmap(func, seq, verbose=False, numthreads=4):
> ? ? size = len(seq)
> ? ? results = [None]*size
> ? ? if verbose:
> ? ? ? ? print "Initiating threads"
> ? ? ? ? thread = VerbosePMapThread
> ? ? else:
> ? ? ? ? thread = PMapThread
> ? ? datapool = Queue.Queue(size)
> ? ? for i in xrange(size):
> ? ? ? ? datapool.put( (results, i, f, seq[i]) )
> ? ? threads = [PMapThread(datapool) for i in xrange(numthreads)]
> ? ? if verbose:
> ? ? ? ? print "All threads created."
> ? ? for t in threads:
> ? ? ? ? t.start()
> ? ? # Block until all threads are done.
> ? ? while any([t.isAlive() for t in threads]):
> ? ? ? ? if verbose:
> ? ? ? ? ? ? time.sleep(0.25)
> ? ? ? ? ? ? print results
> ? ? return results
>
> And here's the timing results:
>
> >>> from timeit import Timer
> >>> setup = "from __main__ import pmap, f; data = range(50)"
> >>> min(Timer('map(f, data)', setup).repeat(repeat=5, number=3))
> 74.999755859375
> >>> min(Timer('pmap(f, data)', setup).repeat(repeat=5, number=3))
>
> 20.490942001342773
>
> --
> Steven

Hi Steven,

I am impressed by this - it shows the potential speedup that pmap
could give. Although the GIL would be a problem as things for speed up
of pure Python code. Do Jython and Iron Python include the threading
module?

Jeremy


From jeremy at martinfamily.freeserve.co.uk  Tue May 19 14:29:25 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Tue, 19 May 2009 11:29:25 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<c26b61e0-ee42-411b-a689-1f47e98f332a@r3g2000vbp.googlegroups.com>
Message-ID: <b22a0e8d-e19f-4ed7-b7a3-a04163641f57@u10g2000vbd.googlegroups.com>

On 17 May, 13:37, jer... at martinfamily.freeserve.co.uk wrote:
> On 17 May, 13:05, jer... at martinfamily.freeserve.co.uk wrote:> From a user point of view I think that adding a 'par' construct to
> > Python for parallel loops would add a lot of power and simplicity,
> > e.g.
>
> > par i in list:
> > ? ? updatePartition(i)
>
> ...actually, thinking about this further, I think it would be good to
> add a 'sync' keyword which causes a thread rendezvous within a
> parallel loop. This would allow parallel loops to run for longer in
> certain circumstances without having the overhead of stopping and
> restarting all the threads, e.g.
>
> par i in list:
> ? ? for j in iterations:
> ? ? ? ?updatePartion(i)
> ? ? ? ?sync
> ? ? ? ?commitBoundaryValues(i)
> ? ? ? ?sync
>
> This example is a typical iteration over a grid, e.g. finite elements,
> calculation, where the boundary values need to be read by neighbouring
> partitions before they are updated. It assumes that the new values of
> the boundary values are stored in temporary variables until they can
> be safely updated.
>
> Jeremy

I have coded up a (slightly) more realistic example. Here is a code to
implement the numerical solution to Laplace's equation, which can
calculate the values of a potential field across a rectangular region
given fixed boundary values:

xmax = 200
ymax = 200
niterations = 200

# Initialisation
old=[[0.0 for y in range(ymax)] for x in range(xmax)]
for x in range(xmax):
    old[x][0] = 1.0
for y in range(ymax):
    old[0][y] = 1.0
new=[[old[x][y] for y in range(ymax)] for x in range(xmax)]

# Iterations
for i in range(1,100):
    print "Iteration: ", i
    for x in range(1,ymax-1):
        for y in range(1, xmax-1):
	    new[x][y] = \
	    0.25*(old[x-1][y] + old[x+1][y] + old[x][y-1] + old[x-1][y])
    # Swap over the new and old storage arrays
    tmp = old
    old = new
    new = tmp


# Print results
for y in range(ymax):
    for x in range(xmax):
        print str(old[x][y]).rjust(7),
    print

In order to parallelise this with the par construct would require a
single alteration to the iteration section:

for i in range(1,100):
    print "Iteration: ", i
    par x in range(1,ymax-1):
        for y in range(1, xmax-1):
	    new[x][y] = \
	    0.25*(old[x-1][y] + old[x+1][y] + old[x][y-1] + old[x-1][y])
    # Swap over the new and old storage arrays
    tmp = old
    old = new
    new = tmp

The par command tells python that it may choose to fire up multiple
threads and automatically partition the data between them. So, for
instance, if there were ten threads created each one would work on a
sub-range of x values: thread 1 takes x from 1 to 100, thread 2 takes
x from 101 to 200, etc.

However with this approach there is an overhead in each iteration of
starting up the threads and shutting them down again. Depending on the
impact of this overhead, it might be better to keep the threads
running between iterations by modifying the code like this, adding a
'sync' command to synchronise the threads at the end of each iteration
and also making sure that only one of the threads performs the swap of
the data arrays.

par x in range(1,ymax-1):
    for i in range(1,100):
    if __thread__ == 0: print "Iteration: ", i
        for y in range(1, xmax-1):
	    new[x][y] = \
	    0.25*(old[x-1][y] + old[x+1][y] + old[x][y-1] + old[x-1][y])
    # Swap over the new and old storage arrays
    sync
    if __thread__ == 0:
        tmp = old
        old = new
        new = tmp
    sync

Jeremy






From deets at nospam.web.de  Tue May 19 14:33:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 19 May 2009 20:33:33 +0200
Subject: Adding a Par construct to Python?
In-Reply-To: <e31643b2-43f1-48a5-b7c6-3930c7232af0@o30g2000vbc.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
	<e31643b2-43f1-48a5-b7c6-3930c7232af0@o30g2000vbc.googlegroups.com>
Message-ID: <77gcbtF1h49omU1@mid.uni-berlin.de>

> 
> Hi Steven,
> 
> I am impressed by this - it shows the potential speedup that pmap
> could give. Although the GIL would be a problem as things for speed up
> of pure Python code. Do Jython and Iron Python include the threading
> module?


Jython does, and AFAIK IronPython also. Jython also has no GIL I think, 
for IronPython I don't know that.

Diez


From deets at nospam.web.de  Tue May 19 14:34:32 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 19 May 2009 20:34:32 +0200
Subject: Best library to make XSLT 2.0 transformation
In-Reply-To: <mailman.400.1242750955.8015.python-list@python.org>
References: <7fa6e7f2-00ae-4b9b-86a2-0ce62b9914d1@q14g2000vbn.googlegroups.com>	<77fk56F1fg5c6U1@mid.uni-berlin.de>
	<mailman.400.1242750955.8015.python-list@python.org>
Message-ID: <77gcdoF1h49omU2@mid.uni-berlin.de>

John Krukoff schrieb:
> On Tue, 2009-05-19 at 13:42 +0200, Diez B. Roggisch wrote:
>> wdveloper wrote:
>>
>>> Hi there,
>>>
>>> I need to make xml transformation using XSLT 2.0 (since i want to use
>>> the powerful tag <xsl:result-document> to produce multiple files).
>>> In your experience, which kind of library out there is better?
>> XSLT is a standard, so if you find a library that implements it, there
>> shouldn't be much differences.
>>
>> Having said that, these days lxml2 is the craze, and it contains
>> xslt-processing. It would be my first (and hopefully last) stop.
>>
>> Diez
> 
> While I firmly believe lxml is the best python XML library available,
> being built on libxml2 means that it only supports XSLT 1.0. As far as I
> know, if you want 2.0 support, you still need to be using one of the
> Java XSLT processors.


Ah, sorry, I missed the 2.0 requirement.

Diez


From suruti94 at gmail.com  Tue May 19 14:42:40 2009
From: suruti94 at gmail.com (Mohan Parthasarathy)
Date: Tue, 19 May 2009 11:42:40 -0700
Subject: Performance java vs. python
In-Reply-To: <fbe2e2100905191042g59b7522ajd09353fc88dbcf2e@mail.gmail.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<fbe2e2100905191042g59b7522ajd09353fc88dbcf2e@mail.gmail.com>
Message-ID: <89dd3da60905191142k45e77ec0g9558be3aa1efa30b@mail.gmail.com>

On Tue, May 19, 2009 at 10:42 AM, Daniel Fetchinson <
fetchinson at googlemail.com> wrote:

> >> >> On the one hand, there are developers who love big IDEs with lots of
> >> >> features (code generation, error checking, etc.), and rely on them to
> >> >> provide the high level of support needed to be reasonably productive
> >> >> in heavy-weight languages (e.g. Java).
> >> >>
> >> >> On the other hand there are developers who much prefer to keep things
> >> >> light-weight and simple.  They like clean high-level languages (e.g.
> >> >> Python) which are compact enough that you can keep the whole language
> >> >> in your head, and require only a good text editor to be used
> >> >> effectively.
> >> >
> >> >This distinction is IMHO not correct. If you took a look at Java, you
> >> would
> >> >notice that the core language syntax is much simpler than Python's.
> >>
> >> That's half-true.  The problem is that you have to digest a much bigger
> >> chunk of Java before you can start being productive.  Consider how
> simple
> >> it is to write a non-regex grep in Python.  In addition, Python's object
> >> model is simpler than Java's, not even talking about the contortions
> that
> >> Java's static class model forces you into.
> >
> >
> > I am new to Python. I am slowly realizing that Python might be a better
> > choice when compared to java on the server side. Is there any performance
> > comparison between Java and Python ? For example, if I use the J2EE
> solution
> > vs. python (Django etc.) on the server side, would one perform better
> over
> > the other ?
>
> Benchmarks always test for a given feature. The available benchmarks
> will most likely not test the feature relevant for your particular
> application simply because there are about a gazillion different ways
> of using a web framework. So the best you can do is simply test the
> bottleneck part of your application and see for yourself, otherwise
> you will be left with comments like "django is used at work because
> it's faster for us" or "I use j2ee because performance is better for
> my web app". When it will come to choosing your framework these will
> help little to none.


Ah! I should have been careful before asking such "general" question about
performance. I agree with you. But mine was more academic. I should not
given a specific example.

AFAIK, for java on the client side, JVM performance is one of the critical
things which has been tuned to death until now. Even Google's Android which
uses Java for the programming language uses a Dalvik Virtual machine which
was spefically designed to handle low CPU, memory and power environments.
Similarly, Python can also be used to program on Nokia phones etc. Of course
programming natively (C/C++) would make a difference in environments where
CPU, memory and power are a big constraint. Given the context, do we know
how Python compares with Java or even native programming. What is the
overhead of  Python's interpreted code ? Some standard benchmarks would help
compare apples to apples  though it may not help deciding which framework to
choose.

-mohan


>
> Cheers,
> Daniel
>
> --
> Psss, psss, put it down! - http://www.cafepress.com/putitdown
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steko at iosa.it  Tue May 19 14:54:12 2009
From: steko at iosa.it (Stefano Costa)
Date: Tue, 19 May 2009 20:54:12 +0200
Subject: package with executable
Message-ID: <1242759252.4438.114.camel@gibreel>

Hi,
my name is Stefano Costa, I am an archaeologist and I am developing
GNUCal, a radiocarbon calibration program released under the GNU GPL.
[1][2]

Currently the program consists of a small "library", largely based on
Matplotlib and Numpy, and a command line program. My goal is to create a
distributable package, that should ideally contain both the "gnucal"
package and the command line program.

As you can see in the source code [3], I am following some sort of
standard layout for my project, but some things aren't still clear to
me, even after reading setuptools' documentation and looking to the
source of some known Python packages (like sphinx, pastescript, django):
      * where should the executable module be wrt setup.py and/or the
        package directory in the source tree
      * how should I format the console_scripts entry in setup() to make
        the executable module available to the system PATH after
        installing
      * how should I call the "gnucal" package from inside the
        executable script (currently I'm using "from gnucal import core"
        but it doesn't seem to work)

I'm using virtualenv to create testing environments for the install
process, and my Python is 2.5.4 on Debian Sid.

Any suggestion is appreciated, particularly if there are some real
examples to draw from.

thanks,
steko

[1] http://gnucal.iosa.it/
[2] http://en.wikipedia.org/wiki/Radiocarbon_dating#Calibration
[3] http://bitbucket.org/steko/gnucal/

-- 
Stefano Costa
http://www.iosa.it/ Open Archaeology
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From debatem1 at gmail.com  Tue May 19 15:00:10 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 19 May 2009 12:00:10 -0700 (PDT)
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com> 
	<mailman.407.1242754952.8015.python-list@python.org>
Message-ID: <38b7ea25-7ad0-4225-b8a6-8ea7b371b7d7@b1g2000vbc.googlegroups.com>

> Ah! I should have been careful before asking such "general" question about performance. I agree with you. But mine was more academic. I should not given a specific example.
>
> AFAIK, for java on the client side, JVM performance is one of the critical things which has been tuned to death until now. Even Google's Android which uses Java for the programming
> language uses a Dalvik Virtual machine which was spefically designed to handle low CPU, memory and power environments. Similarly, Python can also be used to program on Nokia phones etc. > Of course programming natively (C/C++) would make a difference in environments where CPU, memory and power are a big constraint. Given the context, do we know how Python compares with
> Java or even native programming. What is the overhead of  Python's interpreted code ? Some standard benchmarks would help compare apples to apples  though it may not help deciding which > framework to choose.
>
> -mohan

Danger, will robinson- the dalvik jvm has precisely nothing to do with
standard
java. It uses the same syntax but otherwise operates entirely
differently. Don't
assume you'll get the same performance characteristics out of the
other common
jvm's.

Geremy Condra


From slbentley at gmail.com  Tue May 19 16:40:33 2009
From: slbentley at gmail.com (Scooter)
Date: Tue, 19 May 2009 13:40:33 -0700 (PDT)
Subject: Mock Form Post
Message-ID: <99c7e9d6-b1b2-4343-bbae-b01e0e640fb7@z5g2000vba.googlegroups.com>

Let me qualify this by saying I'm very new to python. I'm doing some
work with mod_python and in a function I have defined I am passing in
the form and then iterating through the form keys. I'm currently
writing my unit tests and I'm trying to mock up a form object with
kids so I can emulate my true form post. So I'm attempting to mock up
a class that I'm calling "_Fakeform".  I'm lost on how I should do it
though. I thought by creating a dictionary object with key value pairs
that would satisfy my need but I'm not sure how to get at it when I
pass my mocked class in.


From rhamph at gmail.com  Tue May 19 16:43:16 2009
From: rhamph at gmail.com (Adam Olsen)
Date: Tue, 19 May 2009 13:43:16 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com> 
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com> 
	<a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com> 
	<349328ba-e396-46aa-ac4b-ae5d7c2796a9@v17g2000vbb.googlegroups.com>
Message-ID: <64a76765-3759-40dc-8b92-3eca0a304481@21g2000vbk.googlegroups.com>

On May 19, 5:05?am, jer... at martinfamily.freeserve.co.uk wrote:
> Thanks for explaining a few things to me. So it would seem that
> replacing the GIL with something which allows better scalability of
> multi-threaded applications, would be very complicated. The paper by
> Jesse Nolle which I referenced in my original posting includes the
> following:
>
> "In 1999 Greg Stein created a patch set for the interpreter that
> removed the GIL, but added granular locking around sensitive
> interpreter operations. This patch set had the direct effect of
> speeding up threaded execution, but made single threaded execution two
> times slower."
>
> Source:http://jessenoller.com/2009/02/01/python-threads-and-the-global-inter...
>
> That was ten years ago - do you have any idea as to how things have
> been progressing in this area since then?

https://launchpad.net/python-safethread


From jeff at jmcneil.net  Tue May 19 16:47:28 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Tue, 19 May 2009 13:47:28 -0700 (PDT)
Subject: package with executable
References: <mailman.411.1242760431.8015.python-list@python.org>
Message-ID: <10af10fc-adbd-4c46-bf4c-21e87e48bb63@t10g2000vbg.googlegroups.com>

On May 19, 2:54?pm, Stefano Costa <st... at iosa.it> wrote:
> Hi,
> my name is Stefano Costa, I am an archaeologist and I am developing
> GNUCal, a radiocarbon calibration program released under the GNU GPL.
> [1][2]
>
> Currently the program consists of a small "library", largely based on
> Matplotlib and Numpy, and a command line program. My goal is to create a
> distributable package, that should ideally contain both the "gnucal"
> package and the command line program.
>
> As you can see in the source code [3], I am following some sort of
> standard layout for my project, but some things aren't still clear to
> me, even after reading setuptools' documentation and looking to the
> source of some known Python packages (like sphinx, pastescript, django):
> ? ? ? * where should the executable module be wrt setup.py and/or the
> ? ? ? ? package directory in the source tree
> ? ? ? * how should I format the console_scripts entry in setup() to make
> ? ? ? ? the executable module available to the system PATH after
> ? ? ? ? installing
> ? ? ? * how should I call the "gnucal" package from inside the
> ? ? ? ? executable script (currently I'm using "from gnucal import core"
> ? ? ? ? but it doesn't seem to work)
>
> I'm using virtualenv to create testing environments for the install
> process, and my Python is 2.5.4 on Debian Sid.
>
> Any suggestion is appreciated, particularly if there are some real
> examples to draw from.
>
> thanks,
> steko
>
> [1]http://gnucal.iosa.it/
> [2]http://en.wikipedia.org/wiki/Radiocarbon_dating#Calibration
> [3]http://bitbucket.org/steko/gnucal/
>
> --
> Stefano Costahttp://www.iosa.it/Open Archaeology
>
> ?signature.asc
> < 1KViewDownload

So, I've got a couple packages where I've used the same method.
Generally, I've formatted my entry_points argument as follows:

entry_points = {
      'console_scripts': [ 'xmlrpctool =
hostapi.clients.xmlrpc:main' ]
   },

It's just a dictionary with a 'console_scripts' key. The value is a
list of wrapper scripts that are to be installed along with the
library files. In this scenario, I'm installing a wrapper script
called 'xmlrpctool' which calls a function named main in the xmlrpc
module within my hostapi.clients package. SetupTools generates that
wrapper for you.

That main function can be any callable. Looking at the way you've
formatted your gnucal.py script, I'm not sure it's going to work
without a bit of modification.

My personal approach would be to move that code into your gnucal
directory, either as it's own module or within one of the existing,
and implement it as a "main" function.

Then an entry_points line such as the following will make sure
'gnucal' gets installed in a directory on your path:

entry_points = {
      'console_scripts': [ 'gnucal = gnucal.core:main' ]
   },

This, of course, assumes that you move your main function into
'gnucal.core.'

HTH,

Jeff
mcjeff.blogspot.com



From slbentley at gmail.com  Tue May 19 17:02:30 2009
From: slbentley at gmail.com (Scooter)
Date: Tue, 19 May 2009 14:02:30 -0700 (PDT)
Subject: Mock Form Post
References: <99c7e9d6-b1b2-4343-bbae-b01e0e640fb7@z5g2000vba.googlegroups.com>
Message-ID: <13e11ed4-8c40-4973-ab45-87e3e41bfb3b@m24g2000vbp.googlegroups.com>

On May 19, 3:40?pm, Scooter <slbent... at gmail.com> wrote:
> Let me qualify this by saying I'm very new to python. I'm doing some
> work with mod_python and in a function I have defined I am passing in
> the form and then iterating through the form keys. I'm currently
> writing my unit tests and I'm trying to mock up a form object with
> kids so I can emulate my true form post. So I'm attempting to mock up
> a class that I'm calling "_Fakeform". ?I'm lost on how I should do it
> though. I thought by creating a dictionary object with key value pairs
> that would satisfy my need but I'm not sure how to get at it when I
> pass my mocked class in.

1 strike against me for poor proof reading.
1) While I did mention mod_python I didn't say I was referring to an
HTML form.
2) I said I'm trying to mock up a form object with "kids". No idea how
I messed that up, but it should be "keys"


From rsarpi at gmail.com  Tue May 19 17:07:37 2009
From: rsarpi at gmail.com (icarus)
Date: Tue, 19 May 2009 14:07:37 -0700 (PDT)
Subject: optparse options
Message-ID: <dd64aed2-ca3a-4f5e-8d22-d78aa52bb027@d38g2000prn.googlegroups.com>

Why do I need to put two options for this script to print the path?

if I just specify the option and argument...
$ python <script>.py -p xxxx
Usage: <script>.py [-p dir] [--part=dir]

<script>.py: error: No options specified

So I need to give it two arguments...
$ python <script>.py --part xxxx y
xxxx


Desired output:
$ python <script>.py --part xxxx
xxxx

$ python <script>.py --part xxxx y
Usage: <script>.py [-p dir] [--part=dir]
<script>.py: error: some message


----
#/usr/bin/python

import optparse

def main():
	parser = optparse.OptionParser(usage="%prog [-p dir] [--part=dir] ",
version="%prog 1.0")

	parser.add_option( "-p", "--part", dest="directory",
	                  help="process target directory", metavar="dir")
	(options, args) = parser.parse_args()

	if len(args) != 1:
		parser.error("No options specified")


	path = options.directory
	print path

if __name__ == "__main__":
	main()


From nytrokiss at gmail.com  Tue May 19 17:21:16 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Wed, 20 May 2009 00:21:16 +0300
Subject: Advanced Python books?
In-Reply-To: <77g2nbF1h267rU1@mid.individual.net>
References: <gusevn$jjd$1@reader1.panix.com>
	<77g2nbF1h267rU1@mid.individual.net>
Message-ID: <8a6b8e350905191421p4c0d3ccbmfad635f5a18d78bd@mail.gmail.com>

I found Core Python Programming to cater to my needs as a Pro book.

On Tue, May 19, 2009 at 6:48 PM, Thomas Guettler <hv at tbz-pariv.de> wrote:

> kj schrieb:
> > I have read a couple of "learn Python"-type books, and now I'm
> > looking for some more advanced books on Python,
> ...
> > Basically I'm looking for a book that assumes that one has the
> > basics of the language down, and instead focuses on standard problems
> > of software development, such as application architecture and
> > design, prototyping, debugging, profiling and performance-tuning,
> > testing, packaging/distribution, extending/embedding, threading
> > and IPC, persistence, etc., and on various prototypical cases such
> > as command-line utilities, GUI-apps, webapps, database-backed apps,
> > simulations, etc.
>
> I think there is no such book. Maybe the Python Cookbook comes near.
>
> webapps: I use django, other use turbogears, other even different stuff...
> There are several books about e.g. django. It would be hard to
> put all the magic of all web apps into one chapter.
>
> GUI-apps: You can use tkinter, qt or gtk.... again it would be hard
> to put something useable into one chapter.
>
>   Thomas
>
> --
> Thomas Guettler, http://www.thomas-guettler.de/
> E-Mail: guettli (*) thomas-guettler + de
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.astorandblack.com
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From walterbyrd at iname.com  Tue May 19 17:38:19 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Tue, 19 May 2009 14:38:19 -0700 (PDT)
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
Message-ID: <940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>

On May 8, 5:55?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 8, 3:03?pm,walterbyrd<walterb... at iname.com> wrote:
>
> > This works, but it seems like there should be a better way.
>
> > --------------
> > week = ['sun','mon','tue','wed','thu','fri','sat']
> > for day in week[week.index('tue'):week.index('fri')]:
> > ? ?print day
> > ---------------
>
> I think you should provide much more information, primarily why you
> want to do this. ?What is the larger goal you are trying to achieve?

I am just looking for a less verbose, more elegant, way to print a
slice of a list. What is hard to understand about that? I am not sure
how enumerated types help.


From namekuseijin at gmail.com  Tue May 19 17:43:34 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Tue, 19 May 2009 18:43:34 -0300
Subject: Performance java vs. python
In-Reply-To: <mailman.407.1242754952.8015.python-list@python.org>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.407.1242754952.8015.python-list@python.org>
Message-ID: <guv968$2l5j$1@adenine.netfront.net>

someone said:
>>>> If you took a look at Java, you would
>>>> notice that the core language syntax is much simpler than Python's.

thanks for the laughs whoever you are!

-- 
a game sig: http://tinyurl.com/d3rxz9


From paul at boddie.org.uk  Tue May 19 17:44:30 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Tue, 19 May 2009 14:44:30 -0700 (PDT)
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
	<4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>
	<3b84542c-7746-498d-8d9e-977deaecfc1d@r3g2000vbp.googlegroups.com>
	<77g46cF1h8ffnU1@mid.uni-berlin.de>
Message-ID: <954320a5-10ef-41f3-8a08-c1163be19206@e23g2000vbe.googlegroups.com>

On 19 Mai, 18:16, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> Sorry to say so, but that's nonsense. DOM is not complicated because it
> contains anything superior - the reason (if any) is that it is formulated
> as language-agnostic as possible, with the unfortunate result it is rather
> clumsy to use in all languages.

Although I presume that people really mean the core standards when
they talk about "the DOM", not all the other ones related to those
core standards, the API is not to everyone's taste because, amongst
other things, it uses functions and methods when some people would
rather use properties (which actually appear in various places in the
standards, so it isn't as if the W3C haven't heard of such things),
and for lots of other subjective reasons: some I can agree with, some
I put at the same level as a lot of the API-posturing in numerous
domains where Python code gets written, where such code jostles above
all other concerns for the coveted "Pythonic" label.

However, when people are actually choosing to use DOM-related
technologies, and when those technologies do not necessarily have
equivalents in whatever other technology stack that could be
suggested, can we not just take it as read that they actually know
that the DOM isn't very nice (or that other people don't think that
it's very nice) and that there are alternatives to the core stuff
(especially when the inquirer has actually indicated his familiarity
with those alternatives) and that reminding everyone for the nth time
about how bad the DOM is (for whatever tangential purpose only
partially related to the topic under discussion) adds very little if
anything in the way of advice? It's like someone saying that they're
going to fly the Atlantic in a 747 only to be told that they should
drive a Lexus because "Boeing make terrible cars".

Feel free to replace "DOM" in the above with whatever else fits,
because this kind of thing comes up all the time.

Paul


From robert.kern at gmail.com  Tue May 19 18:16:46 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 19 May 2009 17:16:46 -0500
Subject: optparse options
In-Reply-To: <dd64aed2-ca3a-4f5e-8d22-d78aa52bb027@d38g2000prn.googlegroups.com>
References: <dd64aed2-ca3a-4f5e-8d22-d78aa52bb027@d38g2000prn.googlegroups.com>
Message-ID: <guvb4i$l8$1@ger.gmane.org>

On 2009-05-19 16:07, icarus wrote:
> Why do I need to put two options for this script to print the path?
>
> if I just specify the option and argument...
> $ python<script>.py -p xxxx
> Usage:<script>.py [-p dir] [--part=dir]
>
> <script>.py: error: No options specified
>
> So I need to give it two arguments...
> $ python<script>.py --part xxxx y
> xxxx

You have this piece of code:

	if len(args) != 1:
		parser.error("No options specified")

The args list contains all of the arguments after the options. Unlike sys.argv, 
it does not contain the executable's name in the first slot.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From dstanek at dstanek.com  Tue May 19 18:21:29 2009
From: dstanek at dstanek.com (David Stanek)
Date: Tue, 19 May 2009 18:21:29 -0400
Subject: Performance java vs. python
In-Reply-To: <guv968$2l5j$1@adenine.netfront.net>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.407.1242754952.8015.python-list@python.org>
	<guv968$2l5j$1@adenine.netfront.net>
Message-ID: <de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>

On Tue, May 19, 2009 at 5:43 PM, namekuseijin <namekuseijin at gmail.com> wrote:
> someone said:
>>>>>
>>>>> If you took a look at Java, you would
>>>>> notice that the core language syntax is much simpler than Python's.
>
> thanks for the laughs whoever you are!
>

I'm no Java fan, but I do agree that the core language is a bit easier
for people to grasp. I have also heard that from other developers as
well.

-- 
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek


From gunterhenriksen at gmail.com  Tue May 19 18:22:25 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Tue, 19 May 2009 15:22:25 -0700
Subject: Context manager, atexit processing, and PEP 3143 
	DaemonContext.close
In-Reply-To: <87fxf17b0m.fsf@benfinney.id.au>
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>
	<87hbzk8eoh.fsf@benfinney.id.au>
	<mailman.342.1242666875.8015.python-list@python.org>
	<87fxf17b0m.fsf@benfinney.id.au>
Message-ID: <ab4fa3490905191522w5063f25ex8d86a4a0d0303ad7@mail.gmail.com>

> > If there is a function which triggers a one-shot switch, I like
> > to have a way to find out if it has already been triggered, I
> > prefer to have the function tell me if it triggered the switch
> > or not, but I would not want that to be by raising an exception.
>
> In this case, though, we're talking about a class intended to
> implement the context manager API (in addition to other API).
>
> So, following your argument above, we might expect a generic
> context manager object to be able to tell us whether we're
> currently inside that context or not.  Does such a thing exist?

By a "one-shot switch" I meant as something which
changes once atomically in isolation, not as
something whose state comprises a transaction during
which the state of multiple externally visible
objects might change.

I imagine if there is an object used as a context
manager whose context state ("currently inside
that context or not") is not strictly under the
control of the single "with" statement where it is
fulfilling the "context manager" contract, would not
be a generic context manager.

In other words, to me it seems like the concept of
"currently inside a context or not" is not something
visible external to the object except in a case
where there is another thread of execution, which is
not a case I would expect to be part of the generic
context manager protocol, but can be added by an
object which implements the context manager protocol
and also keeps track of its state by setting flags
in the __enter__ and __exit__ functions.

Does this make sense?


From deets at nospam.web.de  Tue May 19 18:26:37 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 20 May 2009 00:26:37 +0200
Subject: Mock Form Post
In-Reply-To: <13e11ed4-8c40-4973-ab45-87e3e41bfb3b@m24g2000vbp.googlegroups.com>
References: <99c7e9d6-b1b2-4343-bbae-b01e0e640fb7@z5g2000vba.googlegroups.com>
	<13e11ed4-8c40-4973-ab45-87e3e41bfb3b@m24g2000vbp.googlegroups.com>
Message-ID: <77gq0tF1hhqbgU1@mid.uni-berlin.de>

Scooter schrieb:
> On May 19, 3:40 pm, Scooter <slbent... at gmail.com> wrote:
>> Let me qualify this by saying I'm very new to python. I'm doing some
>> work with mod_python and in a function I have defined I am passing in
>> the form and then iterating through the form keys. I'm currently
>> writing my unit tests and I'm trying to mock up a form object with
>> kids so I can emulate my true form post. So I'm attempting to mock up
>> a class that I'm calling "_Fakeform".  I'm lost on how I should do it
>> though. I thought by creating a dictionary object with key value pairs
>> that would satisfy my need but I'm not sure how to get at it when I
>> pass my mocked class in.
> 
> 1 strike against me for poor proof reading.
> 1) While I did mention mod_python I didn't say I was referring to an
> HTML form.
> 2) I said I'm trying to mock up a form object with "kids". No idea how
> I messed that up, but it should be "keys"

If you'd use mod_wsgi, you could create a WSGI-application that's easily 
testable with paste fixture, including filling out forms, following 
redirects and all that.

Diez


From david.lyon at preisshare.net  Tue May 19 18:46:15 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 19 May 2009 18:46:15 -0400
Subject: Package problem
In-Reply-To: <5b8d13220905190840u5cd76323y98c44f5dd724c7e@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
	<5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
	<200905191329.48531.a.cavallo@cavallinux.eu>
	<5b8d13220905190840u5cd76323y98c44f5dd724c7e@mail.gmail.com>
Message-ID: <55093b941323dec2f138f34f3d605b1f@preisshare.net>

On Wed, 20 May 2009 00:40:28 +0900, David Cournapeau <cournape at gmail.com>
wrote:

> The discussion has nothing to do with setuptools, or even python for
> that matter. 

It has everything to do with python....

> on any system (including windows). That's why you should avoid
> installing from sources into the locations managed by the OS, be it
> /usr for unix, or C:\Windows on windows, etc...

I actually kind of agree with what you're saying here. Under Linux
it seems to me that users shouldn't be playing around in the
bowels of /usr/.... or anything lower...

but....

site-packages is the directory that one would want to keep
python packages in. That should be a developer/sysop area
and not owned and run by the o/s.

maybe... maybe... although too late now (?) somewhere
like /etc/site-packages might be a lot better place to
keep ones site packages. Or /opt.

Under windows in python 2.6, they have this concept of
user-packages.

One could easily also apply that concept to linux and
have a /home/user/.user-packages directory in which
one could keep all ones user packages.

> The problem is that overwriting files managed by the
> software management system without its consent is bound to be broken,

Something like what I describe above would totally
satisfy linux system organisation requirements.

David


From clp2 at rebertia.com  Tue May 19 18:48:40 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 19 May 2009 15:48:40 -0700
Subject: Performance java vs. python
In-Reply-To: <de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.407.1242754952.8015.python-list@python.org>
	<guv968$2l5j$1@adenine.netfront.net>
	<de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>
Message-ID: <50697b2c0905191548l32cd8485g4176e80641cef599@mail.gmail.com>

On Tue, May 19, 2009 at 3:21 PM, David Stanek <dstanek at dstanek.com> wrote:
> On Tue, May 19, 2009 at 5:43 PM, namekuseijin <namekuseijin at gmail.com> wrote:
>> someone said:
>>>>>>
>>>>>> If you took a look at Java, you would
>>>>>> notice that the core language syntax is much simpler than Python's.
>>
>> thanks for the laughs whoever you are!
>>
>
> I'm no Java fan, but I do agree that the core language is a bit easier
> for people to grasp. I have also heard that from other developers as
> well.

Perhaps for those with a C/C++ background, but I doubt that's true
generally speaking.

Cheers,
Chris
-- 
http://blog.rebertia.com


From gunterhenriksen at gmail.com  Tue May 19 18:56:38 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Tue, 19 May 2009 15:56:38 -0700
Subject: Performance java vs. python
In-Reply-To: <89dd3da60905191142k45e77ec0g9558be3aa1efa30b@mail.gmail.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<fbe2e2100905191042g59b7522ajd09353fc88dbcf2e@mail.gmail.com>
	<89dd3da60905191142k45e77ec0g9558be3aa1efa30b@mail.gmail.com>
Message-ID: <ab4fa3490905191556r67c19959je0e4d6e405a47478@mail.gmail.com>

My experience has been that if the execution stays
inside the VM, then for a "server side" application, the
JVM is faster, and proportionally even faster when there
are more threads ready to do something.

When the VM has to do a lot of interaction with the
OS, then I think it is difficult to make general
statements about Java vs Python, because there is so
much dependency on how a particular library interacts
with the operating system or with a remote server.
For example a database driver which is doing a lot
of conversion between the data representation of the
database and the native representation of the VM may
chew up more time than anything else, and for CPython
that driver may be doing all that stuff in a C library
where the Java version of the driver may be doing it all
in the JVM and taking an order of magnitude longer.

It seems to me like the guts of the JVM and CPython
VMs are pretty comparable in terms of performance, and
both languages are amenable to taking advantage of the
performance of the VM.

Other than the library implementations for interfacing
with the outside world, for me the major performance
distinction is with concurrency.  I tend to implement
solutions which rely pretty heavily on shared objects
and the java.util.concurrent facilities, and it seems
to me like the CPython VM is not able to easily provide
the level of simple clean shared object concurrency
support the JVM does.  And my experience with the Python
"multiprocessing" module is that while it is better than
nothing, it does not seem to facilitate nearly the level
of efficient shared object support the JVM does.


From phihag at phihag.de  Tue May 19 18:57:48 2009
From: phihag at phihag.de (Philipp Hagemeister)
Date: Wed, 20 May 2009 00:57:48 +0200
Subject: issue: Permissions in odfpy
In-Reply-To: <862e00220905182351k3ec16f8dnc7841d7e749ff743@mail.gmail.com>
References: <862e00220905182351k3ec16f8dnc7841d7e749ff743@mail.gmail.com>
Message-ID: <4A13396C.4060209@phihag.de>

Hi Shruti,

your message is kind of hard to read. Please note the following:

? Do not put useless junk("issue") in title.
? Multiple exclamation marks convey a sure sign of a diseased mind,
especially syntactically interesting constructions such as "??.."
? You didn't purchase your keyboard in August 2001, did you? (
http://ars.userfriendly.org/cartoons/?id=20010820 )
? It's probably just me, but "so please give me some solution" sounds
really rude. Why not "any ideas?", "thanks in advance" or just nothing?
Would you answer an email that ended like this? Please keep in mind, you
are not paying us, and we're trying to help you just because we want
happy python users (or trying to offset us being evil at times).
? Everyone mistpyes, and I'd be throwing mountains in my glass house if
I complained about grammar, but please show at least some effort.

That being said, this might help:

import odf.opendocument

doc = odf.opendocument.load('in.ods')
# You may want to use another way to select the sheet,
# this selects just the first one
sheet = doc.spreadsheet.childNodes[0]
sheet.setAttrNS(
    'urn:oasis:names:tc:opendocument:xmlns:table:1.0',
    'protected',
    'true')
doc.save('out.ods')

Regards,

Philipp

shruti surve wrote:
> hey,
> i am using odfpy and  generating spreadsheet in open office..but nobody
> should modify the file..so can anybody tell me how can we give permissions
> (read only) to spreadsheet in odfpy??..i have change the properties of my
> normal open office spreadsheet file and made it read only..n also
extracted
> it..but in conteny.xml also i am not finding any property which can be
used
> in odfpy...so please give me some solution..
>
>
> regards
> shruti surve
>

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From cjw at ncf.ca  Tue May 19 19:10:51 2009
From: cjw at ncf.ca (Colin J. Williams)
Date: Tue, 19 May 2009 19:10:51 -0400
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
In-Reply-To: <mff7e6-e43.ln1@satorlaser.homedns.org>
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
Message-ID: <guvea4$k8l$1@theodyn.ncf.ca>

Ulrich Eckhardt wrote:
> Steve Ferg wrote:
>> On the one hand, there are developers who love big IDEs with lots of
>> features (code generation, error checking, etc.), and rely on them to
>> provide the high level of support needed to be reasonably productive
>> in heavy-weight languages (e.g. Java).
>>
>> On the other hand there are developers who much prefer to keep things
>> light-weight and simple.  They like clean high-level languages (e.g.
>> Python) which are compact enough that you can keep the whole language
>> in your head, and require only a good text editor to be used
>> effectively.
> 
> This distinction is IMHO not correct. If you took a look at Java, you would
> notice that the core language syntax is much simpler than Python's. OTOH,
> if you add the standard libraries, you would soon see that Python's
> libraries are not as consistent (i.e. conformant to PEP8) as Java's.
> 
> What makes up for Python's perceived usability problems though is the
> commandline parser that allows you to inspect the type of an object and its
> parts of it at runtime, in particular the docstrings are a treasure there.
> 
> That said, an IDE that provides auto-completion (e.g. that gives you a list
> of available class members) is a good thing in Java, because you don't have
> to browse the documentation as often. With Python, that is impossible
> because there are no types bound to parameters, so any type that fits is
> allowed (duck typing).

I suggest that you look at PyScripter. 
It's helped if there is a doc string and 
if the parameters are spelled out i.e. 
not *args or **kwargs,

Colin W.
> 
> Uli
> 


From ben+python at benfinney.id.au  Tue May 19 19:21:01 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 20 May 2009 09:21:01 +1000
Subject: optparse options
References: <dd64aed2-ca3a-4f5e-8d22-d78aa52bb027@d38g2000prn.googlegroups.com>
Message-ID: <87bppo7k82.fsf@benfinney.id.au>

icarus <rsarpi at gmail.com> writes:

> 	parser = optparse.OptionParser(usage="%prog [-p dir] [--part=dir] ",
> version="%prog 1.0")
> 
> 	parser.add_option( "-p", "--part", dest="directory",
> 	                  help="process target directory", metavar="dir")
> 	(options, args) = parser.parse_args()

As documented in ?OptionParser.parse_args?, the return values are the
options parsed, and the *remaining* arguments after all the arguments
parsed as options.

So, the ?args? name will be bound to a list of only those arguments
which were not options. Very useful for programs which, in addition to
options, also take positional arguments where each argument position has
a specific meaning (e.g. ?input_file output_file?).

> 	if len(args) != 1:
> 		parser.error("No options specified")

The message is confusing, since it doesn't match the condition; it would
be correct to say ?Did not specify exactly one non-option argument?.

In this case, it looks like you don't want to check this at all, and
should instead operate on the basis of the options only.

-- 
 \          ?There's a certain part of the contented majority who love |
  `\            anybody who is worth a billion dollars.? ?John Kenneth |
_o__)                                            Galbraith, 1992-05-23 |
Ben Finney


From tjreedy at udel.edu  Tue May 19 19:21:52 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 19 May 2009 19:21:52 -0400
Subject: Is there a better way to chose a slice of a list?
In-Reply-To: <940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
Message-ID: <guveue$e1q$1@ger.gmane.org>

walterbyrd wrote:
> On May 8, 5:55 pm, John Yeung <gallium.arsen... at gmail.com> wrote:
>> On May 8, 3:03 pm,walterbyrd<walterb... at iname.com> wrote:
>>
>>> This works, but it seems like there should be a better way.
>>> --------------
>>> week = ['sun','mon','tue','wed','thu','fri','sat']
>>> for day in week[week.index('tue'):week.index('fri')]:
>>>    print day
>>> ---------------
>> I think you should provide much more information, primarily why you
>> want to do this.  What is the larger goal you are trying to achieve?
> 
> I am just looking for a less verbose, more elegant, way to print a
> slice of a list. 

week[2:5] # ;-)

If you want the interpreter to turn non-ints into ints for you, you will 
have to give it some sort of function or mapping to use.

dayint = {day:i for i,day in enumeratr(week)} # works in Py3 at least
week[dayint['tue']:dayint['fri']]

# or, untested, basing attrodic on memory of posted code

class attrodic(): #py3
   def __init__(self, dic):
     self.__dict__.update(dic)

di = attrodic(week)
week[di.tue:di.fri]

Most elegant, and most setup work ;-).

Terry Jan Reedy



From rhodri at wildebst.demon.co.uk  Tue May 19 19:22:12 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 20 May 2009 00:22:12 +0100
Subject: Is there a better way to chose a slice of a list?
In-Reply-To: <940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
Message-ID: <op.ut69vavja8ncjz@gnudebst>

On Tue, 19 May 2009 22:38:19 +0100, walterbyrd <walterbyrd at iname.com>  
wrote:

> On May 8, 5:55?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
>> On May 8, 3:03?pm,walterbyrd<walterb... at iname.com> wrote:
>>
>> > This works, but it seems like there should be a better way.
>>
>> > --------------
>> > week = ['sun','mon','tue','wed','thu','fri','sat']
>> > for day in week[week.index('tue'):week.index('fri')]:
>> > ? ?print day
>> > ---------------
>>
>> I think you should provide much more information, primarily why you
>> want to do this. ?What is the larger goal you are trying to achieve?
>
> I am just looking for a less verbose, more elegant, way to print a
> slice of a list. What is hard to understand about that? I am not sure
> how enumerated types help.

This is verbose and inelegant because of the way you're storing and
using the data, hence (I presume) John's question.  The more elegant
approach is not to try to index a list with strings, but to keep you
"day" data in numeric form and use that to slice with, and for that
enums will greatly help you keep things clear.  However, whether that's
worth doing or not depends on the bigger picture, and you haven't
told us anything that would help us figure that out.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From ben+python at benfinney.id.au  Tue May 19 19:29:42 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 20 May 2009 09:29:42 +1000
Subject: package with executable
References: <mailman.411.1242760431.8015.python-list@python.org>
Message-ID: <877i0c7jtl.fsf@benfinney.id.au>

Stefano Costa <steko at iosa.it> writes:

> my name is Stefano Costa, I am an archaeologist and I am developing
> GNUCal, a radiocarbon calibration program released under the GNU GPL.
> [1][2]

That is a great use of Python, and sounds like interesting work.

I would highly recommend you change the name, though.

Your project is not (I assume) developed under the auspice of the GNU
project, so it's misleading to call it ?GNU foobar? instead of just
?foobar?. There's no trademark involved, but it's still best to keep
the namespace clearly deliniated (which is also entirely in the Python
spirit :-)

Also, to call a program ?cal? risks great confusion among those who
know the standard ?cal? program as a calendar-generation utility. It's
best to avoid that confusion since it's entirely predictable.

Better would be something that evokes radiocarbon calibration; or, since
that's probably a pretty difficult job for a simple name, choose
something snappy that is at least evocative of the themes of
archaeology, radiocarbon dating, or measurement calibration.

Naming isn't an easy job, but it's an important one and is your only
chance at a first impression for the project.

-- 
 \           ?A thorough reading and understanding of the Bible is the |
  `\                           surest path to atheism.? ?Donald Morgan |
_o__)                                                                  |
Ben Finney
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From ben+python at benfinney.id.au  Tue May 19 19:31:54 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 20 May 2009 09:31:54 +1000
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
Message-ID: <873ab07jpx.fsf@benfinney.id.au>

walterbyrd <walterbyrd at iname.com> writes:

> On May 8, 5:55?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> > On May 8, 3:03?pm,walterbyrd<walterb... at iname.com> wrote:
> > I think you should provide much more information, primarily why you
> > want to do this. ?What is the larger goal you are trying to achieve?
> 
> I am just looking for a less verbose, more elegant, way to print a
> slice of a list.

That's just the same micro-goal re-stated. What is your larger problem
of which this is a part? Perhaps a better approach can be suggested when
that context is known.

-- 
 \                 ?What's another word for Thesaurus?? ?Steven Wright |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From david.lyon at preisshare.net  Tue May 19 19:57:11 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 19 May 2009 19:57:11 -0400
Subject: Package problem
In-Reply-To: <200905191329.48531.a.cavallo@cavallinux.eu>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
	<5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
	<200905191329.48531.a.cavallo@cavallinux.eu>
Message-ID: <0747ee4ca3a90b1eda48eb579c21e4c1@preisshare.net>

On Tue, 19 May 2009 13:29:47 +0100, "A. Cavallo" <a.cavallo at cavallinux.eu>
wrote:
> You could try:
> 
> http://download.opensuse.org/repositories/home:/cavallo71:/python-opt/
> 
> This is a python interpreter installed under /opt/opt-python-2.7a0.
> All you have to do is sourcing /opt/opt-python-2.7a0/opt-python-env.sh
> from a shell and start using the python 2.7 (it's directly from the svn 
> trunk).
> 
> If you download a python module to generate the rpm for it all you have
to
> do 
> is:
> $> . /opt/opt-python-2.7a0/opt-python-env.sh
> $> python setup.py bdist_rpm 
> 
> It will generate a package rpm installable under /opt/python-2.7a0 and
> won't 
> interfere with the system.

I'm fascinated by this and want to try...

The above just gave me an ftp link?

Can you explain again how to do it?




From sjmachin at lexicon.net  Tue May 19 19:59:47 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 19 May 2009 16:59:47 -0700 (PDT)
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com> 
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
Message-ID: <46959810-1a29-4451-aa10-4b3d0eec36f7@b7g2000pre.googlegroups.com>

On May 20, 7:38?am, walterbyrd <walterb... at iname.com> wrote:
> On May 8, 5:55?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
>
> > On May 8, 3:03?pm,walterbyrd<walterb... at iname.com> wrote:
>
> > > This works, but it seems like there should be a better way.
>
> > > --------------
> > > ---------------
>
> > I think you should provide much more information, primarily why you
> > want to do this. ?What is the larger goal you are trying to achieve?
>
> I am just looking for a less verbose, more elegant, way to print a
> slice of a list. What is hard to understand about that?

Ummm two things, (1) You didn't say that was what you wanted (2) It's
a nonsense anyway:

Your original statement "choose a slice of alist": answer = alist
[lo:hi]

Your current statement "print a slice of a list" (one element per line
as per your example): can not be done much less verbosely and more
elegantly than:
    for x in alist[lo:hi]:
        print x

Your real problem appears to be the horrid method of deriving lo and
hi.

You gave ONE example without stating anything more precise than that
it was an example of a slice of a list [which was obvious anyway] and
didn't specify in what sense of "better" you wanted a better way. So
people have to guess what you really want.

Guessing that the 'tue' and 'fri' in your one example will always be
constants, here are two options:

E.g. given
week = ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat']

Option (1):
SUN, MON, TUE, WED, THU, FRI, SAT = range(7)
for day in week[TUE:FRI]:
    print day

Option (2):
for day in week[2:5]:
    print day

HTH,
John


From google at mrabarnett.plus.com  Tue May 19 20:07:39 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 20 May 2009 01:07:39 +0100
Subject: package with executable
In-Reply-To: <877i0c7jtl.fsf@benfinney.id.au>
References: <mailman.411.1242760431.8015.python-list@python.org>
	<877i0c7jtl.fsf@benfinney.id.au>
Message-ID: <4A1349CB.6090405@mrabarnett.plus.com>

Ben Finney wrote:
> Stefano Costa <steko at iosa.it> writes:
> 
>> my name is Stefano Costa, I am an archaeologist and I am developing
>> GNUCal, a radiocarbon calibration program released under the GNU GPL.
>> [1][2]
> 
> That is a great use of Python, and sounds like interesting work.
> 
> I would highly recommend you change the name, though.
> 
> Your project is not (I assume) developed under the auspice of the GNU
> project, so it's misleading to call it ?GNU foobar? instead of just
> ?foobar?. There's no trademark involved, but it's still best to keep
> the namespace clearly deliniated (which is also entirely in the Python
> spirit :-)
> 
> Also, to call a program ?cal? risks great confusion among those who
> know the standard ?cal? program as a calendar-generation utility. It's
> best to avoid that confusion since it's entirely predictable.
> 
> Better would be something that evokes radiocarbon calibration; or, since
> that's probably a pretty difficult job for a simple name, choose
> something snappy that is at least evocative of the themes of
> archaeology, radiocarbon dating, or measurement calibration.
> 
> Naming isn't an easy job, but it's an important one and is your only
> chance at a first impression for the project.
> 
The name that springs to my mind is "radcarbcal", but then that's just
me. :-)


From MLMLists at Comcast.net  Tue May 19 20:08:27 2009
From: MLMLists at Comcast.net (Mitchell L Model)
Date: Tue, 19 May 2009 20:08:27 -0400
Subject: sqlite3, qmarks, and NULL values
Message-ID: <p06240801c638f39624e9@[10.0.1.221]>

Suppose I have a simple query in sqlite3 in a function:

    def lookupxy(x, y):
        conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
                     (x, y))

However, COL2 might be NULL. I can't figure out a value for y that would retrieve rows for which COL2 is NULL. It seems to me that I have to perform an awkward test to determine whether to execute a query with one question mark or two.

    def lookupxy(x, y):
        if y:
            conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
                         (x, y))
        else:
            conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 IS NULL",
                         (x,))

The more question marks involved the more complicated this would get, especially if question marks in the middle of several would sometimes need to be NULL. I hope I'm missing something and that someone can tell me what it is.


From castironpi at gmail.com  Tue May 19 20:26:11 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 19 May 2009 17:26:11 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
Message-ID: <de2b10af-ff26-40ba-9588-d609386eaa57@q2g2000vbr.googlegroups.com>

On May 17, 7:05?am, jer... at martinfamily.freeserve.co.uk wrote:
> From a user point of view I think that adding a 'par' construct to
> Python for parallel loops would add a lot of power and simplicity,
> e.g.
>
> par i in list:
> ? ? updatePartition(i)
>
> There would be no locking and it would be the programmer's
> responsibility to ensure that the loop was truly parallel and correct.
>
> The intention of this would be to speed up Python execution on multi-
> core platforms. Within a few years we will see 100+ core processors as
> standard and we need to be ready for that.
>
> There could also be parallel versions of map, filter and reduce
> provided.
>
> BUT...none of this would be possible with the current implementation
> of Python with its Global Interpreter Lock, which effectively rules
> out true parallel processing.
>
> See:http://jessenoller.com/2009/02/01/python-threads-and-the-global-inter...
>
> What do others think?
>
> Jeremy Martin

Hi, joining late.

My first guess is that you haven't considered the existing syntactic
variants.

for i in list:
    fireandforget( updatePartition )( i )

for i in list:
    with fireandforget( ) as x:
        x.call( updatePartition )( i )

@fireandforget
def fun( i ):
    updatePartition( i )
for i in list:
    fun( i )

Are you suggesting only syntactic sugar, or a true semantic change to
make parallel programming easier?


From google at mrabarnett.plus.com  Tue May 19 20:54:08 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 20 May 2009 01:54:08 +0100
Subject: sqlite3, qmarks, and NULL values
In-Reply-To: <p06240801c638f39624e9@[10.0.1.221]>
References: <p06240801c638f39624e9@[10.0.1.221]>
Message-ID: <4A1354B0.6070300@mrabarnett.plus.com>

Mitchell L Model wrote:
> Suppose I have a simple query in sqlite3 in a function:
> 
>     def lookupxy(x, y):
>         conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
>                      (x, y))
> 
> However, COL2 might be NULL. I can't figure out a value for y that would retrieve rows for which COL2 is NULL. It seems to me that I have to perform an awkward test to determine whether to execute a query with one question mark or two.
> 
[snip]
Have you tried None, ie lookupxy(x, None)?


From sjmachin at lexicon.net  Tue May 19 21:37:27 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 19 May 2009 18:37:27 -0700 (PDT)
Subject: sqlite3, qmarks, and NULL values
References: <p06240801c638f39624e9@[10.0.1.221]>
	<mailman.425.1242780835.8015.python-list@python.org>
Message-ID: <94b67cc7-fac3-4e31-9106-4f209265e04b@g31g2000pra.googlegroups.com>

On May 20, 10:54?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> Mitchell L Model wrote:
> > Suppose I have a simple query in sqlite3 in a function:
>
> > ? ? def lookupxy(x, y):
> > ? ? ? ? conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
> > ? ? ? ? ? ? ? ? ? ? ?(x, y))
>
> > However, COL2 might be NULL. I can't figure out a value for y that would retrieve rows for which COL2 is NULL. It seems to me that I have to perform an awkward test to determine whether to execute a query with one question mark or two.
>
> [snip]
> Have you tried None, ie lookupxy(x, None)?

Have *you* tried that? Here's another armchair philosopher's take on
the expected outcome:

EITHER:

the wrapper blindly causes this to appear like "... COL2 = NULL",
which won't/shouldn't work. "expression = NULL" is neither true nor
false, it's unknown. The WHERE clause will/should return no rows at
all.

Example of unknowableness of nullity using relops:

sqlite> select case when 1 = null then 'A' else 'B' end;
B
sqlite> select case when 1 <> null then 'A' else 'B' end;
B
Note that "1 = null" is not true AND "1 <> null" is not true either.

OR:

The wrapper cunningly but unadvertisedly is causing that to appear
like "... COL2 IS NULL"

Cheers,
John


From steven at REMOVE.THIS.cybersource.com.au  Tue May 19 22:26:10 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 20 May 2009 02:26:10 GMT
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
Message-ID: <pan.2009.05.20.02.26.09@REMOVE.THIS.cybersource.com.au>

On Tue, 19 May 2009 14:38:19 -0700, walterbyrd wrote:

> On May 8, 5:55?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
>> On May 8, 3:03?pm,walterbyrd<walterb... at iname.com> wrote:
>>
>> > This works, but it seems like there should be a better way.
>>
>> > --------------
>> > week = ['sun','mon','tue','wed','thu','fri','sat'] for day in
>> > week[week.index('tue'):week.index('fri')]:
>> > ? ?print day
>> > ---------------
>>
>> I think you should provide much more information, primarily why you
>> want to do this. ?What is the larger goal you are trying to achieve?
> 
> I am just looking for a less verbose, more elegant, way to print a slice
> of a list. What is hard to understand about that? I am not sure how
> enumerated types help.

Printing a slice of a list is about as concise and elegant as possible:

print alist[slice_obj]

or

print alist[start:end:step]

But that's not what the example in your first post suggests. Your example 
suggests you have *two* problems:

(1) Given a slice, how to print each item in the slice _individually_.

The answer to that is 

for x in aslice:
    print x

Pretty concise and elegant.



(2) Given an arbitrary starting and ending _item_ rather than _position_, 
how to concisely and elegantly generate a slice.

There are many answers, depending on _why_ you want to do this. One 
possible answer is to write a function to do it:

def print_slice(alist, start_item, end_item):
    start_pos = alist.index(start_item)
    end_pos = alist.index(end_item)
    for x in alist[start_pos:end_pos]:
        print x

Now print_slice(week, 'tue', 'fri') is pretty concise and elegant.

Another answer is: Don't do that, do something else. If you have an 
enumerated type, then you could (in principle) do this:

week = enumerated('mon tue wed thu fri sat sun')
for x in week.tue-week.fri:
    print x


depending on the enumerated type itself naturally.



-- 
Steven


From wuwei23 at gmail.com  Tue May 19 22:41:56 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 19 May 2009 19:41:56 -0700 (PDT)
Subject: How can i use Spread Sheet as Data Store
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com> 
	<loom.20090518T151856-387@post.gmane.org>
	<8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com> 
	<20090519082013.65fba203.darcy@druid.net> <guudeo$f15$1@ger.gmane.org> 
	<mailman.389.1242741444.8015.python-list@python.org>
Message-ID: <3d924379-7bd8-4641-9470-c873947e1280@x1g2000prh.googlegroups.com>

On May 19, 11:57?pm, "D'Arcy J.M. Cain" <da... at druid.net> wrote:
> I hear you but I'm not so sure that that is an absolute. ?There are
> many applications that allow you to have your password emailed to you.
> For something with low risk that's perfectly acceptable.

Having -any- password stored in plaintext is unacceptable. I'm pretty
sure I'm not the only person who uses a simple algorithm to generate
passwords based on context. If you're running a site and you're not
going to bother to secure my credentials, I'd hope you'd at least
mention that at sign up so I could adjust my behaviour as appropriate.


From steven at REMOVE.THIS.cybersource.com.au  Tue May 19 22:43:26 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 20 May 2009 02:43:26 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
Message-ID: <pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>

On Tue, 19 May 2009 03:57:43 -0700, jeremy wrote:

>> you want it so simple to use that amateurs can mechanically replace
>> 'for' with 'par' in their code and everything will Just Work, no effort
>> or thought required.
> 
> Yes I do want the par construction to be simple, but of course you can't
> just replace a for loop with a par loop in the general case.

But that's exactly what you said you wanted people to be able to do:

"with my suggestion they could potentially get a massive speed up just by 
changing 'for' to 'par' or 'map' to 'pmap'."

I am finding this conversation difficult because it seems to me you don't 
have a consistent set of requirements.



> This issue
> arises when people use OpenMP: you can take a correct piece of code, add
> a comment to indicate that a loop is 'parallel', and if you get it wrong
> the code with no longer work correctly. 

How will 'par' be any different? It won't magically turn code with 
deadlocks into bug-free code.


> With my 'par' construct the
> programmer's intention is made explicit in the code, rather than by a
> compiler directive and so I think that is clearer than OpenMP.

A compiler directive is just as clear about the programmer's intention as 
a keyword. Possibly even more so.

#$ PARALLEL-LOOP
for x in seq:
    do(x)

Seems pretty obvious to me. (Not that I'm suggesting compiler directives 
is a good solution to this problem.)


> As I wrote before, concurrency is one of the hardest things for
> professional programmers to grasp. For 'amateur' programmers we need to
> make it as simple as possible, 

The problem is that "as simple as possible" is Not Very Simple. There's 
no getting around the fact that concurrency is inherently complex. In 
some special cases, you can keep it simple, e.g. parallel-map with a 
function that has no side-effects. But in the general case, no, you can't 
avoid dealing with the complexity, at least a little bit.


> and I think that a parallel loop
> construction and the dangers that lurk within would be reasonably
> straightforward to explain: there are no locks to worry about, no
> message passing.

It's *already* easy to explain. And having explained it, you still need 
to do something about it. You can't just say "Oh well, I've had all the 
pitfalls explained to me, so now I don't have to actually do anything 
about avoiding those pitfalls". You still need to actually avoid them. 
For example, you can choose one of four tactics:

(1) the loop construct deals with locking;

(2) the caller deals with locking;

(3) nobody deals with locking, therefore the code is buggy and risks 
deadlocks; or

(4) the caller is responsible for making sure he never shares data while 
looping over it.

I don't think I've missed any possibilities. You have to pick one of 
those four. 


> The only advanced concept is the 'sync' keyword, which
> would be used to rendezvous all the threads. That would only be used to
> speed up certain codes in order to avoid having to repeatedly shut down
> and start up gangs of threads.

So now you want a second keyword as well.



-- 
Steven


From wuwei23 at gmail.com  Tue May 19 22:54:24 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 19 May 2009 19:54:24 -0700 (PDT)
Subject: strip char from list of strings
References: <195055.64779.qm@web54204.mail.re2.yahoo.com>
	<mailman.372.1242718327.8015.python-list@python.org> 
	<guuh5b$1s4$1@services.telesweet.net>
Message-ID: <a4e36445-4cd8-42e5-917b-b3881b01a457@g31g2000pra.googlegroups.com>

On May 20, 12:55?am, Laurent Luce <laurentluc... at yahoo.com> wrote:
> I had a simple loop stripping each string but I was looking for
> something concise and efficient. I like the following answer:
> x = [s.rstrip('\n') for s in x]

Your initial requirement stated that you needed this to happen in-
place. What you're doing here is creating a completely new list and
then assigning it to x. While this is most likely what you want, note
that this will not update any other reference to that list:

>>> x = ['test\n', 'test2\n', 'test3\n']
>>> y = x
>>> x = [s.rstrip() for s in x]
>>> x
['test', 'test2', 'test3']
>>> y
['test\n', 'test2\n', 'test3\n']

To perform the same operation in-place, you can use the slice operator
to assign to the list object rather than to the label:

>>> x = ['test\n', 'test2\n', 'test3\n']
>>> y = x
>>> x[:] = [s.rstrip() for s in x] # note the slice operator
>>> x
['test', 'test2', 'test3']
>>> y
['test', 'test2', 'test3']

The latter example is especially important if you have more than one
reference to the list you're modifying and wish them all to have the
updated value.


From steven at REMOVE.THIS.cybersource.com.au  Tue May 19 23:29:22 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 20 May 2009 03:29:22 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
	<bemdncWkNYTJEo_XnZ2dnUVZ_gZi4p2d@posted.usinternet>
Message-ID: <pan.2009.05.20.03.29.22@REMOVE.THIS.cybersource.com.au>

On Tue, 19 May 2009 05:52:04 -0500, Grant Edwards wrote:

> On 2009-05-19, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>
> wrote:
>> On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:
>>
>>> Let me clarify what I think par, pmap, pfilter and preduce would mean
>>> and how they would be implemented.
>> [...]
>>
>> Just for fun, I've implemented a parallel-map function, and done a
>> couple of tests. Comments, criticism and improvements welcome!
> 
> My only comment would be that your "slow function" might not be a very
> simulation for the general-case, since it uses time.sleep() which
> releases the GIL:


I didn't expect my code to magically overcome fundamental limitations of 
the CPython interpreter :)



>> def f(arg):  # Simulate a slow function.
>>     time.sleep(0.5)
>>     return 3*arg-2
> 
> Any Python function that isn't calling a library function written in C
> that releases the GIL won't show any speedup will it?

Not necessarily. Here's another function, that uses a loop instead of 
sleep.

def g(arg, SIZE=8*10**6):
    # Default SIZE is chosen so that on my machine, the loop 
    # takes approximately 0.5 second.
    for x in xrange(SIZE):
        pass
    return 3*arg-2


>>> setup = 'from __main__ import pmap, g; data = range(50)'
>>> min(Timer('map(g, data)', setup).repeat(repeat=5, number=3))
65.093590974807739
>>> min(Timer('pmap(g, data)', setup).repeat(repeat=5, number=3))
20.268381118774414


However, if the function is fast enough that the GIL doesn't get a chance 
to be released often enough, then pmap() is a pessimation:

>>> def g(arg):
...     return 3*arg+2
...
>>> min(Timer('map(g, data)', setup).repeat(repeat=5, number=3))
0.00012803077697753906
>>> min(Timer('pmap(g, data)', setup).repeat(repeat=5, number=3))
19.960626125335693

Concurrency doesn't come for free. There are setup and teardown costs, 
and management costs. Presumably if pmap() was written more cleverly, in 
C, those costs could be reduced, but not eliminated.



> I don't have a
> multi-core machine to try it on, but what happens when you replace your
> "slow function" code with something that actually burns CPU using
> pure-Python code instead of blocking on a timer in the OS?

Two simple work-arounds are:

* use Jython or IronPython; or

* insert time.sleep(0.000001) into your function at various points.


-- 
Steven


From darwin at nowhere.com  Tue May 19 23:55:34 2009
From: darwin at nowhere.com (Paul Hemans)
Date: Wed, 20 May 2009 13:55:34 +1000
Subject: distutils and building an distribution that includes other packages
Message-ID: <guvuvn$31bb$1@news.ett.com.ua>

Hi,
I am new to Python, and after a lot of sweat and tears, I have my first app. 
Now I need to deploy it to end-users. The application includes the use of 
lxml and sqlAlchemy so I need those to install automatically as part of the 
installation process. I really don't want the users having to download 
various modules and install them. Is this facility (to download and install 
other packages seamlessly) part of distutils? If so, I have been looking 
around for a simple tutorial on the topic but haven't found anything yet. 
Can anyone point me to some information?

Thanks 




From clp2 at rebertia.com  Wed May 20 00:16:29 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 19 May 2009 21:16:29 -0700
Subject: distutils and building an distribution that includes other 
	packages
In-Reply-To: <guvuvn$31bb$1@news.ett.com.ua>
References: <guvuvn$31bb$1@news.ett.com.ua>
Message-ID: <50697b2c0905192116j3dfd7187t893351b60fd37232@mail.gmail.com>

On Tue, May 19, 2009 at 8:55 PM, Paul Hemans <darwin at nowhere.com> wrote:
> Hi,
> I am new to Python, and after a lot of sweat and tears, I have my first app.
> Now I need to deploy it to end-users. The application includes the use of
> lxml and sqlAlchemy so I need those to install automatically as part of the
> installation process. I really don't want the users having to download
> various modules and install them. Is this facility (to download and install
> other packages seamlessly) part of distutils? If so, I have been looking
> around for a simple tutorial on the topic but haven't found anything yet.
> Can anyone point me to some information?

Since I'm guessing your platform is Windows, you'll probably be
interested in py2exe - http://www.py2exe.org/

Cheers,
Chris
-- 
http://blog.rebertia.com


From http  Wed May 20 00:20:03 2009
From: http (Paul Rubin)
Date: 19 May 2009 21:20:03 -0700
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
Message-ID: <7x7i0cmmmk.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
> (4) the caller is responsible for making sure he never shares data while 
> looping over it.
> 
> I don't think I've missed any possibilities. You have to pick one of 
> those four. 

I wonder if the compiler can check that a given function doesn't
change any data.  Then:

@pure
def f(x):
   return x*sqrt(x) + 3      # does not mutate any data

@pure
def g(x): ...                # likewise

s = parallel_dot_product(parallel_map(f, vec), parallel_map(g,vec))



From darwin at nowhere.com  Wed May 20 00:31:48 2009
From: darwin at nowhere.com (Paul Hemans)
Date: Wed, 20 May 2009 14:31:48 +1000
Subject: distutils and building an distribution that includes other
	packages
References: <guvuvn$31bb$1@news.ett.com.ua>
	<mailman.426.1242792992.8015.python-list@python.org>
Message-ID: <gv013l$kv$1@news.ett.com.ua>

Hi Chris,
Yes I do intend to use py2exe for windows installation but I don't 
understand how it will help me distribute lxml and sqlAlchemy as part of the 
install, or am I missing something?

"Chris Rebert" <clp2 at rebertia.com> wrote in message 
news:mailman.426.1242792992.8015.python-list at python.org...
> On Tue, May 19, 2009 at 8:55 PM, Paul Hemans <darwin at nowhere.com> wrote:
>> Hi,
>> I am new to Python, and after a lot of sweat and tears, I have my first 
>> app.
>> Now I need to deploy it to end-users. The application includes the use of
>> lxml and sqlAlchemy so I need those to install automatically as part of 
>> the
>> installation process. I really don't want the users having to download
>> various modules and install them. Is this facility (to download and 
>> install
>> other packages seamlessly) part of distutils? If so, I have been looking
>> around for a simple tutorial on the topic but haven't found anything yet.
>> Can anyone point me to some information?
>
> Since I'm guessing your platform is Windows, you'll probably be
> interested in py2exe - http://www.py2exe.org/
>
> Cheers,
> Chris
> -- 
> http://blog.rebertia.com 




From castironpi at gmail.com  Wed May 20 00:41:08 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 19 May 2009 21:41:08 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
	<7x7i0cmmmk.fsf@ruckus.brouhaha.com>
Message-ID: <7f80a17e-1081-46ee-8581-109ca62bdfb7@z5g2000vba.googlegroups.com>

On May 19, 11:20?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> Steven D'Aprano <ste... at REMOVE.THIS.cybersource.com.au> writes:
> > (4) the caller is responsible for making sure he never shares data while
> > looping over it.
>
> > I don't think I've missed any possibilities. You have to pick one of
> > those four.
>
> I wonder if the compiler can check that a given function doesn't
> change any data. ?Then:
>
> @pure
> def f(x):
> ? ?return x*sqrt(x) + 3 ? ? ?# does not mutate any data
>
> @pure
> def g(x): ... ? ? ? ? ? ? ? ?# likewise
>
> s = parallel_dot_product(parallel_map(f, vec), parallel_map(g,vec))

You can do the basics of this using the 'ast' module.  Just check that
no nodes in the ast tree are Assign nodes, including augmented
assign.  Then 'f' is defined as:

f= pure( '''
   return x*sqrt(x) + 3      # does not mutate any data
''' )

Untested.  However, you do need to check that the subchildren don't
make mutations.  This adds hooks to the AST, since names can change at
run-time.  Also, it's only defined for functions that call functions
that are all pure Python and defined using 'pure' as well, without
inspecting the bytecode.  At this point one might look into
metaprogramming and script autogeneration.

The 'pure' wrapper doesn't fundamentally change the semantics of the
function; it is more like a pre- and post-condition check.


From clp2 at rebertia.com  Wed May 20 01:01:34 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 19 May 2009 22:01:34 -0700
Subject: distutils and building an distribution that includes other 
	packages
In-Reply-To: <gv013l$kv$1@news.ett.com.ua>
References: <guvuvn$31bb$1@news.ett.com.ua>
	<mailman.426.1242792992.8015.python-list@python.org>
	<gv013l$kv$1@news.ett.com.ua>
Message-ID: <50697b2c0905192201p75af148crfc187702bc9739f5@mail.gmail.com>

> "Chris Rebert" <clp2 at rebertia.com> wrote in message
> news:mailman.426.1242792992.8015.python-list at python.org...
>> On Tue, May 19, 2009 at 8:55 PM, Paul Hemans <darwin at nowhere.com> wrote:
>>> Hi,
>>> I am new to Python, and after a lot of sweat and tears, I have my first
>>> app.
>>> Now I need to deploy it to end-users. The application includes the use of
>>> lxml and sqlAlchemy so I need those to install automatically as part of
>>> the
>>> installation process. I really don't want the users having to download
>>> various modules and install them. Is this facility (to download and
>>> install
>>> other packages seamlessly) part of distutils? If so, I have been looking
>>> around for a simple tutorial on the topic but haven't found anything yet.
>>> Can anyone point me to some information?
>>
>> Since I'm guessing your platform is Windows, you'll probably be
>> interested in py2exe - http://www.py2exe.org/
>>
>> Cheers,
>> Chris
On Tue, May 19, 2009 at 9:31 PM, Paul Hemans <darwin at nowhere.com> wrote:
> Hi Chris,
> Yes I do intend to use py2exe for windows installation but I don't
> understand how it will help me distribute lxml and sqlAlchemy as part of the
> install, or am I missing something?

Granted I haven't used Windows (and thus py2exe) in a while, but last
I recall the executable it produced was a self-contained Python
executable containing the main script and all its necessary
modules/libraries. I think there were some issues getting it to
include certain finnicky third-party libraries, but once tweaked
properly it could be coaxed to include them.

Thus, you don't need to install/distribute the libraries at all;
they'll be included as part of the generated executable. Then to
distribute/install your program, you just copy the executable (and
maybe a DLL or two, again it's been a while).

Cheers,
Chris
-- 
http://blog.rebertia.com


From rozzin at geekspace.com  Wed May 20 01:22:43 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Wed, 20 May 2009 01:22:43 -0400
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
Message-ID: <87vdnwjql8.fsf@slice.rozzin.com>

Ulrich Eckhardt <eckhardt at satorlaser.com> writes:
> 
> That said, an IDE that provides auto-completion (e.g. that gives you a list
> of available class members) is a good thing in Java, because you don't have
> to browse the documentation as often.

While I find at least some types of autocompletion to be laudable
features, your rationale (if I'm reading it right)..., frankly,
frightens me.

You may find these interesting reading, if you haven't encountered
them previously:

    http://www.cincomsmalltalk.com/userblogs/buck/blogView?showComments=true&entry=3296933922

    http://www.charlespetzold.com/etc/DoesVisualStudioRotTheMind.html

Steve may find them intersting, also--I don't think that either of
them is the particular post for which he's searching, but they both
are quite related to it.

Actually: thank you, Steve, for indirectly reminding me of
`Does Visual Studio Rot the Mind'--I'd forgotten all about it.

> With Python, that is impossible because there are no types bound to
> parameters, so any type that fits is allowed (duck typing).

That does not prevent a tool from showing you the argument-list;
untyped as it is, the number, sequence, and *names* of the arguments
*are* available. And it could be argued (especially with Python's duck
typing) that the parameters' *names* are (or at least *should be*) far
more illustrative of their purpose than their type-specifications
would be.

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From neild at misago.org  Wed May 20 01:35:28 2009
From: neild at misago.org (Damien Neil)
Date: Tue, 19 May 2009 22:35:28 -0700
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
	<4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>
	<3b84542c-7746-498d-8d9e-977deaecfc1d@r3g2000vbp.googlegroups.com>
	<77g46cF1h8ffnU1@mid.uni-berlin.de>
Message-ID: <neild-C119D2.22352819052009@news.individual.net>

 "Diez B. Roggisch" <deets at nospam.web.de> wrote:
> APIs such as ElementTree don't try to burden themselves with the
> language-agnosticism, and thus are much more powerful.

Having used both ElementTree and xml.dom, I don't see that ET is any 
more powerful.  Both APIs let you manipulate an XML tree in pretty much 
any way possible.  (The ET bundled with Python is rather less powerful, 
since it lacks support for processing instructions and other XML 
features, but lxml corrects that.)

Personally, I find ElementTree's handling of text nodes to be very 
clumsy compared to that in the DOM.  For me, DOM with XPath is much 
nicer than ET.  Tastes differ, of course.

                        - Damien


From kalyanchakravarthy at hyit.com  Wed May 20 01:52:59 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Wed, 20 May 2009 11:22:59 +0530
Subject: How to get Form values in Python code and Send Email
Message-ID: <8ca278430905192252g67008d31qcd1da318674e30e1@mail.gmail.com>

Hi All,

    I have one doubt, I have feedback form (HTML Page) in one website user
enters all the details and after submitting the page, in back end Python
class i want to get all those data and send to one email id.

for this please any one can guide me how to do it in  Python( how to get
HTML form data in Python and send those data as an Email) and Google Apps

Thanks in advance

-- 
Regards
Kalyan
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From steven at REMOVE.THIS.cybersource.com.au  Wed May 20 01:57:38 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 20 May 2009 05:57:38 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
	<7x7i0cmmmk.fsf@ruckus.brouhaha.com>
	<7f80a17e-1081-46ee-8581-109ca62bdfb7@z5g2000vba.googlegroups.com>
Message-ID: <pan.2009.05.20.05.57.39@REMOVE.THIS.cybersource.com.au>

On Tue, 19 May 2009 21:41:08 -0700, Aaron Brady wrote:

> On May 19, 11:20?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>> Steven D'Aprano <ste... at REMOVE.THIS.cybersource.com.au> writes:
>> > (4) the caller is responsible for making sure he never shares data
>> > while looping over it.
>>
>> > I don't think I've missed any possibilities. You have to pick one of
>> > those four.
>>
>> I wonder if the compiler can check that a given function doesn't change
>> any data. ?Then:
>>
>> @pure
>> def f(x):
>> ? ?return x*sqrt(x) + 3 ? ? ?# does not mutate any data
>>
>> @pure
>> def g(x): ... ? ? ? ? ? ? ? ?# likewise
>>
>> s = parallel_dot_product(parallel_map(f, vec), parallel_map(g,vec))
> 
> You can do the basics of this using the 'ast' module.  Just check that
> no nodes in the ast tree are Assign nodes, including augmented assign. 
> Then 'f' is defined as:
> 
> f= pure( '''
>    return x*sqrt(x) + 3      # does not mutate any data
> ''' )
> 
> Untested.  


Can you explain how you can tell that there are no side-effects from 
x*sqrt(x)+3 ? What if I have this?

class Funny(object):
    def __add__(self, other):
        global parrot
        parrot += 1
        return 5 + other

x = Funny()




-- 
Steven


From a.cavallo at cavallinux.eu  Wed May 20 02:01:39 2009
From: a.cavallo at cavallinux.eu (A. Cavallo)
Date: Wed, 20 May 2009 07:01:39 +0100
Subject: package with executable
In-Reply-To: <1242759252.4438.114.camel@gibreel>
References: <1242759252.4438.114.camel@gibreel>
Message-ID: <200905200701.39370.a.cavallo@cavallinux.eu>

Hi,

> Matplotlib and Numpy, and a command line program. My goal is to create a
> distributable package, that should ideally contain both the "gnucal"
> package and the command line program.
>       * where should the executable module be wrt setup.py and/or the
>         package directory in the source tree
>       * how should I format the console_scripts entry in setup() to make
>         the executable module available to the system PATH after
>         installing

With the standard distutils (no need for setuptools) the config.py file might 
look like:


===== setup.py =====
from distutils.core import setup

version = '0.1'


setup(name='gnucal',
      version=version,
      description="GNUCal is a radiocarbon (14C) calibration program",
      long_description="""\
""",
      author='Stefano Costa',
      author_email='steko at iosa.it',
      url='http://gnucal.iosa.it/',
      license='GNU GPLv3',
      packages=['gnucal',],
      scripts=['gnucal.py',]
      )

>       * how should I call the "gnucal" package from inside the
>         executable script (currently I'm using "from gnucal import core"
>         but it doesn't seem to work)

import gnucal must work. If you're developing from the sources (eg. without 
having the package installed) you need to be in the same dir where the 
gnucal.py is or you need to set PYTHONPATH in order to find the directory 
gnucal (the one containing __init__.py).


> I'm using virtualenv to create testing environments for the install
> process, and my Python is 2.5.4 on Debian Sid.
>
> Any suggestion is appreciated, particularly if there are some real
> examples to draw from.

At line 101 the statement sys.exit("Please.. should be parser.error("Please..

Regards,
Antonio


From paul.hemans at gmail.com  Wed May 20 02:19:43 2009
From: paul.hemans at gmail.com (Paul Hemans)
Date: Tue, 19 May 2009 23:19:43 -0700 (PDT)
Subject: distutils and building an distribution that includes other 
	packages
References: <guvuvn$31bb$1@news.ett.com.ua>
	<mailman.426.1242792992.8015.python-list@python.org> 
	<gv013l$kv$1@news.ett.com.ua>
	<mailman.427.1242795696.8015.python-list@python.org>
Message-ID: <369167d3-f002-43d2-a838-477f0551e2d8@j18g2000prm.googlegroups.com>

On May 20, 3:01?pm, Chris Rebert <c... at rebertia.com> wrote:
> > "Chris Rebert" <c... at rebertia.com> wrote in message
> >news:mailman.426.1242792992.8015.python-list at python.org...
> >> On Tue, May 19, 2009 at 8:55 PM, Paul Hemans <dar... at nowhere.com> wrote:
> >>> Hi,
> >>> I am new to Python, and after a lot of sweat and tears, I have my first
> >>> app.
> >>> Now I need to deploy it to end-users. The application includes the use of
> >>> lxml and sqlAlchemy so I need those to install automatically as part of
> >>> the
> >>> installation process. I really don't want the users having to download
> >>> various modules and install them. Is this facility (to download and
> >>> install
> >>> other packages seamlessly) part of distutils? If so, I have been looking
> >>> around for a simple tutorial on the topic but haven't found anything yet.
> >>> Can anyone point me to some information?
>
> >> Since I'm guessing your platform is Windows, you'll probably be
> >> interested in py2exe -http://www.py2exe.org/
>
> >> Cheers,
> >> Chris
> On Tue, May 19, 2009 at 9:31 PM, Paul Hemans <dar... at nowhere.com> wrote:
> > Hi Chris,
> > Yes I do intend to use py2exe for windows installation but I don't
> > understand how it will help me distribute lxml and sqlAlchemy as part of the
> > install, or am I missing something?
>
> Granted I haven't used Windows (and thus py2exe) in a while, but last
> I recall the executable it produced was a self-contained Python
> executable containing the main script and all its necessary
> modules/libraries. I think there were some issues getting it to
> include certain finnicky third-party libraries, but once tweaked
> properly it could be coaxed to include them.
>
> Thus, you don't need to install/distribute the libraries at all;
> they'll be included as part of the generated executable. Then to
> distribute/install your program, you just copy the executable (and
> maybe a DLL or two, again it's been a while).
>
> Cheers,
> Chris
> --http://blog.rebertia.com- Hide quoted text -
>
> - Show quoted text -

Ah, I was overcomplicating things (again).
Thanks


From timr at probo.com  Wed May 20 02:34:37 2009
From: timr at probo.com (Tim Roberts)
Date: Tue, 19 May 2009 23:34:37 -0700
Subject: Python mail truncate problem
References: <4db625fe-158d-4b04-af0b-23e54c3ae22b@e23g2000vbe.googlegroups.com>
Message-ID: <i38715tu7uf82c8l1csul3sq6lsp2pk165@4ax.com>

David <Wwy58 at yahoo.com> wrote:
>
>I am writing Python script to process e-mails in a user's mail
>account. What I want to do is to update that e-mail's Status to 'R'
>after processing it, however, the following script truncates old e-
>mails even though it updates that e-mail's Status correctly. Anybody
>knows how to fix this?

Truncates in what way?  When I tried this, it seemed to work fine.

Note, however, that it is somewhat dangerous to modify an iterator while
you are using it.  (That is, you are setting mbox[key] while doing
mbox.iteritems.)  I might suggest you grab the keys as a list and iterate
through them:

   for key in mbox.keys():
       msg = mbox[key]
       ...
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From ldo at geek-central.gen.new_zealand  Wed May 20 02:46:01 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 20 May 2009 18:46:01 +1200
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<gutcdg$3st$4@lust.ihug.co.nz>
	<ac63e27e-2dd9-4c27-ace0-d9e205be7afa@s31g2000vbp.googlegroups.com>
	<gutoh2$b0a$1@lust.ihug.co.nz>
	<5f7f9840-0e17-48fb-acf9-04186fb1b7ab@r3g2000vbp.googlegroups.com>
Message-ID: <gv08v9$pgg$1@lust.ihug.co.nz>

In message <5f7f9840-0e17-48fb-acf9-04186fb1b7ab at r3g2000vbp.googlegroups.com>, Jack Trades wrote:

> On May 19, 3:53 am, Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
>
>> Possibly your CGI scripts are running as some user like "nobody", which
>> doesn't have the right access to the files/directories. Changing APIs
>> won't help here.
> 
> If that is the case, would setuid be appropriate here?

You mean suexec? Certainly, yes.



From ldo at geek-central.gen.new_zealand  Wed May 20 02:47:17 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 20 May 2009 18:47:17 +1200
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<gutcdg$3st$4@lust.ihug.co.nz>
	<ac63e27e-2dd9-4c27-ace0-d9e205be7afa@s31g2000vbp.googlegroups.com>
	<gutoh2$b0a$1@lust.ihug.co.nz>
	<5f7f9840-0e17-48fb-acf9-04186fb1b7ab@r3g2000vbp.googlegroups.com>
	<77fv7jF1h44coU1@mid.uni-berlin.de>
Message-ID: <gv091m$pgg$2@lust.ihug.co.nz>

In message <77fv7jF1h44coU1 at mid.uni-berlin.de>, Diez B. Roggisch wrote:

> I have had many troubles with SVN + permissions.

I create a custom captive user to own write access to the repository, with 
access only to keys belonging to authorized users via svn+ssh. Problem 
solved.



From __peter__ at web.de  Wed May 20 03:08:27 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 20 May 2009 09:08:27 +0200
Subject: sqlite3, qmarks, and NULL values
References: <mailman.424.1242778866.8015.python-list@python.org>
Message-ID: <gv0a91$stk$02$1@news.t-online.com>

Mitchell L Model wrote:

> Suppose I have a simple query in sqlite3 in a function:
> 
>     def lookupxy(x, y):
>         conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
>                      (x, y))
> 
> However, COL2 might be NULL. I can't figure out a value for y that would
> retrieve rows for which COL2 is NULL. It seems to me that I have to
> perform an awkward test to determine whether to execute a query with one
> question mark or two.
> 
>     def lookupxy(x, y):
>         if y:
>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 =
>             ?",
>                          (x, y))
>         else:
>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 IS
>             NULL",
>                          (x,))
> 
> The more question marks involved the more complicated this would get,
> especially if question marks in the middle of several would sometimes need
> to be NULL. I hope I'm missing something and that someone can tell me what
> it is.

You could create a custom function

def equals(a, b):
    return a == b

conn.create_function("equals", 2, equals)

cursor.execute("select * from table where equals(col1, ?) and ...", (x,...))

Or you do some gymnastics in Python:

class Expr(object):
    def __init__(self, dict):
        self.dict = dict
    def __getitem__(self, key):
        value = self.dict[key]
        if value is None:
            return "(%s is null)" % key
        return "(%s = :%s)" % (key, key)

def lookup(col1, col2):
    lookup = locals()
    sql = "SELECT * FROM table WHERE %(col1)s AND %(col2)s" % Expr(lookup)
    return conn.execute(sql, lookup)

I think these are both more readable than

"... where case when :col1 is null then (col1 is null) else (col1 = :col1) end ..."

Peter





From kalyanchakravarthy at hyit.com  Wed May 20 03:31:28 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Wed, 20 May 2009 13:01:28 +0530
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <3d924379-7bd8-4641-9470-c873947e1280@x1g2000prh.googlegroups.com>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
	<loom.20090518T151856-387@post.gmane.org>
	<8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com>
	<20090519082013.65fba203.darcy@druid.net> <guudeo$f15$1@ger.gmane.org>
	<mailman.389.1242741444.8015.python-list@python.org>
	<3d924379-7bd8-4641-9470-c873947e1280@x1g2000prh.googlegroups.com>
Message-ID: <8ca278430905200031x41896081p3c45fbfe37a73743@mail.gmail.com>

Thanks Alex
                   Then tell me how can I solve this issue.

Thanks in advance

Regards
Kalyan

On Wed, May 20, 2009 at 8:11 AM, alex23 <wuwei23 at gmail.com> wrote:

> On May 19, 11:57 pm, "D'Arcy J.M. Cain" <da... at druid.net> wrote:
> > I hear you but I'm not so sure that that is an absolute.  There are
> > many applications that allow you to have your password emailed to you.
> > For something with low risk that's perfectly acceptable.
>
> Having -any- password stored in plaintext is unacceptable. I'm pretty
> sure I'm not the only person who uses a simple algorithm to generate
> passwords based on context. If you're running a site and you're not
> going to bother to secure my credentials, I'd hope you'd at least
> mention that at sign up so I could adjust my behaviour as appropriate.
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Regards
Kalyan
Mobile no: +91 9985351220
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From aotto1968 at t-online.de  Wed May 20 03:53:03 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Wed, 20 May 2009 09:53:03 +0200
Subject: PYTHONPATH on Windows XP module load problem
References: <guubg7$nnk$03$1@news.t-online.com>
Message-ID: <gv0csv$29p$02$1@news.t-online.com>

Hi,

  I try to use "distutils" and "setup.py" to create an C extension

  Now a list of problems:

  1. I'm using automake, autoconf to setup the build-environment
        for example CPPFLAGS

        -> how can I transport the CPPFLAGS on the commandline
                to setup.py 

        I can not use the "define_macros" argument in the setup.py
        script

  2. the following shared library is created:

        build/lib.linux-x86_64-3.0/pymsgque.so

        -> in my tool a test environment is included this mean
                "after" a build but before "install" a test is
                done. this mean that the library have to be found
                and used by the test-environment.

        -> the problem is that the directory name
                "build/lib.linux-x86_64-3.0/"
                is system-depend

        -> question: how I get an unique system independent name
                or just in general how I solve this kind of problem

  3. why is no ".pyd" file created ?

        -> pyd is the extension name supported 


mfg

  Andreas Otto




From mike_kazantsev at fraggod.net  Wed May 20 03:54:52 2009
From: mike_kazantsev at fraggod.net (Mike Kazantsev)
Date: Wed, 20 May 2009 13:54:52 +0600
Subject: optparse options
In-Reply-To: <87bppo7k82.fsf@benfinney.id.au>
References: <dd64aed2-ca3a-4f5e-8d22-d78aa52bb027@d38g2000prn.googlegroups.com>
	<87bppo7k82.fsf@benfinney.id.au>
Message-ID: <4A13B74C.3060404@fraggod.net>

Ben Finney wrote:
> icarus <rsarpi at gmail.com> writes:
> 
>> 	parser = optparse.OptionParser(usage="%prog [-p dir] [--part=dir] ",
>> version="%prog 1.0")
>>
>> 	parser.add_option( "-p", "--part", dest="directory",
>> 	                  help="process target directory", metavar="dir")
>> 	(options, args) = parser.parse_args()

...

>> 	if len(args) != 1:
>> 		parser.error("No options specified")
> 
> The message is confusing, since it doesn't match the condition; it would
> be correct to say ?Did not specify exactly one non-option argument?.
> 
> In this case, it looks like you don't want to check this at all, and
> should instead operate on the basis of the options only.

I also wanted to note that it looks quite illogical and
counter-intuitive to create "required options", since by definition they
should be optional.
Try using arguments instead, with some type-switching flags, if
necessary - it should make CLI more consistent and save some typing by
omitting otherwise always-required option argument ("--part").

-- 
Mike Kazantsev // fraggod.net

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From jeremy at martinfamily.freeserve.co.uk  Wed May 20 04:19:50 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Wed, 20 May 2009 01:19:50 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
Message-ID: <16b51c17-b293-461e-8e87-efed1d35e5ba@o30g2000vbc.googlegroups.com>

On 20 May, 03:43, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Tue, 19 May 2009 03:57:43 -0700, jeremy wrote:
> >> you want it so simple to use that amateurs can mechanically replace
> >> 'for' with 'par' in their code and everything will Just Work, no effort
> >> or thought required.
>
> > Yes I do want the par construction to be simple, but of course you can't
> > just replace a for loop with a par loop in the general case.
>
> But that's exactly what you said you wanted people to be able to do:
>
> "with my suggestion they could potentially get a massive speed up just by
> changing 'for' to 'par' or 'map' to 'pmap'."
>
> I am finding this conversation difficult because it seems to me you don't
> have a consistent set of requirements.
>
> > This issue
> > arises when people use OpenMP: you can take a correct piece of code, add
> > a comment to indicate that a loop is 'parallel', and if you get it wrong
> > the code with no longer work correctly.
>
> How will 'par' be any different? It won't magically turn code with
> deadlocks into bug-free code.
>
> > With my 'par' construct the
> > programmer's intention is made explicit in the code, rather than by a
> > compiler directive and so I think that is clearer than OpenMP.
>
> A compiler directive is just as clear about the programmer's intention as
> a keyword. Possibly even more so.
>
> #$ PARALLEL-LOOP
> for x in seq:
> ? ? do(x)
>
> Seems pretty obvious to me. (Not that I'm suggesting compiler directives
> is a good solution to this problem.)
>
> > As I wrote before, concurrency is one of the hardest things for
> > professional programmers to grasp. For 'amateur' programmers we need to
> > make it as simple as possible,
>
> The problem is that "as simple as possible" is Not Very Simple. There's
> no getting around the fact that concurrency is inherently complex. In
> some special cases, you can keep it simple, e.g. parallel-map with a
> function that has no side-effects. But in the general case, no, you can't
> avoid dealing with the complexity, at least a little bit.
>
> > and I think that a parallel loop
> > construction and the dangers that lurk within would be reasonably
> > straightforward to explain: there are no locks to worry about, no
> > message passing.
>
> It's *already* easy to explain. And having explained it, you still need
> to do something about it. You can't just say "Oh well, I've had all the
> pitfalls explained to me, so now I don't have to actually do anything
> about avoiding those pitfalls". You still need to actually avoid them.
> For example, you can choose one of four tactics:
>
> (1) the loop construct deals with locking;
>
> (2) the caller deals with locking;
>
> (3) nobody deals with locking, therefore the code is buggy and risks
> deadlocks; or
>
> (4) the caller is responsible for making sure he never shares data while
> looping over it.
>
> I don't think I've missed any possibilities. You have to pick one of
> those four.
>
> > The only advanced concept is the 'sync' keyword, which
> > would be used to rendezvous all the threads. That would only be used to
> > speed up certain codes in order to avoid having to repeatedly shut down
> > and start up gangs of threads.
>
> So now you want a second keyword as well.
>
> --
> Steven

Hi Steven,

You wrote:

> I am finding this conversation difficult because it seems to me you don't have a consistent set of requirements".

I think that my position has actually been consistent throughout this
discussion about what I would like to achieve. However I have learned
more about the inner workings of python than I knew before which have
made it clear that it would be difficult to implement (in CPython at
least). And also I never intended to present this as a fait accompli -
the intention was to start a debate as we have been doing. You also
wrote

> So now you want a second keyword as well

I actually described the 'sync' keyword in my second email before
anybody else contributed.

I *do* actually know a bit about concurrency and would never imply
that *any* for loop could be converted to a parallel one. The
intention of my remark "with my suggestion they could potentially get
a massive speed up just by changing 'for' to 'par' or 'map' to
'pmap'." is that it could be applied in the particular circumstances
where there are no dependencies between different iterations of the
loop.

Regarding your implementation strategies, mine would be related to
this one:

> (4) the caller is responsible for making sure he never shares data while
> looping over it.

However in my world there is no problem with threads sharing data as
long as they do not change the values. So the actual rule would be
something like:

5. The caller is responsible for making sure that one iteration of the
parallel loop never tries to write to a variable that another
iteration may read, unless separated by a 'sync' event.

This shows why the sync event is needed - to avoid  race conditions on
shared variables. It is borrowed from the BSP paradigm - although that
is a distibuted memory approach. Without the sync clause, rule 5 would
just be the standard way of defining a parallelisable loop.

Jeremy

P.S. I have a couple of additional embellishments to share at this
stage:

1. Parallel slackness - this is a concept where one creates many more
threads than there are available cores to cover up for a load
imbalance. So you might use this in a case where the iterations you
wish to parallelise take a variable amount of time. I think my par
concept needs a mechanism for the user to specify how many threads to
create - overriding any decision made by Python, e.g.
par 100 i in list: # Create 100 threads no matter how many cores are
available.

2. Scope of the 'sync' command. It was pointed out to me by a
colleague that I need to define what happens with sync when there are
nested par loops. I think that it should be defined to apply to the
innermost par construct which encloses the statement.


From bluefisher80 at gmail.com  Wed May 20 04:20:04 2009
From: bluefisher80 at gmail.com (Jim Qiu)
Date: Wed, 20 May 2009 16:20:04 +0800
Subject: Yet another question about class property.
Message-ID: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>

Hi everyone,

Following is the code i am reading, i don't see anywhere the declaration of
Message.root object,
Where is it from?

#bots-modules
import bots.botslib as botslib
import bots.node as node
from bots.botsconfig import *


class Message(object):
    ''' abstract class; represents a edi message.
        is subclassed as outmessage or inmessage object.
    '''
    def __init__(self):
        self.recordnumber=0                #segment counter. Is not used for
UNT of SE record; some editypes want sequential recordnumbering

    @staticmethod
    def display(records):
        '''for debugging lexed records.'''
        for record in records:
            t = 0
            for veld in record:
                if t==0:
                    print '%s    (Record-id)'%(veld[VALUE])
                else:
                    if veld[SFIELD]:
                        print '        %s    (sub)'%(veld[VALUE])
                    else:
                        print '    %s    (veld)'%(veld[VALUE])
                t += 1

    def get(self,*mpaths):
        ''' query tree (self.root) with mpath; get value (string); get None
if not found.'''
        if self.root.record is None:
            raise botslib.MpathRootError('get("%s"): "root" of incoming
message is empty; either split messages or use inn.getloop'%(str(mpaths)))
        return self.root.get(*mpaths)

    def getnozero(self,*mpaths):
        ''' like get, returns None is value is zero (0) or not numeric.
            Is sometimes usefull in mapping.'''
        if self.root.record is None:
            raise botslib.MpathRootError('get("%s"): "root" of incoming
message is empty; either split messages or use inn.getloop'%(str(mpaths)))
        return self.root.getnozero(*mpaths)

    def getindicator(self,ind,*mpaths):
        ''' like get, returns None is value is zero (0) or not numeric.
            Is sometimes usefull in mapping.'''
        if self.root.record is None:
            raise botslib.MpathRootError('get("%s"): "root" of incoming
message is empty; either split messages or use inn.getloop'%(str(mpaths)))
        return self.root.getindicator(ind,*mpaths)

    def getcount(self):
        ''' count number of nodes in self.root. Number of nodes is number of
records.'''
        return self.root.getcount()

    def getcountoccurrences(self,*mpaths):
        ''' count number of nodes in self.root. Number of nodes is number of
records.'''
        count = 0
        for value in self.getloop(*mpaths):
            count += 1
        return count

    def getcountsum(self,*mpaths):
        ''' return the sum for all values found in mpath. Eg total number of
ordered quantities.'''
        if self.root.record is None:
            raise botslib.MpathRootError('get("%s"): "root" of incoming
message is empty; either split messages or use inn.getloop'%(str(mpaths)))
        return self.root.getcountsum(*mpaths)

    def getloop(self,*mpaths):
        ''' query tree with mpath; generates all the nodes. Is typically
used as: for record in inn.get(mpath):
        '''
        if self.root.record:    #self.root is a real root
            for terug in self.root.getloop(*mpaths): #search recursive for
rest of mpaths
                yield terug
        else:   #self.root is dummy root
            for childnode in self.root.children:
                for terug in childnode.getloop(*mpaths): #search recursive
for rest of mpaths
                    yield terug

    def put(self,*mpaths):
        if self.root.record is None and self.root.children:
            raise botslib.MpathRootError('put("%s"): "root" of outgoing
message is empty; use out.putloop'%(str(mpaths)))
        return self.root.put(*mpaths)

    def putloop(self,*mpaths):
        if not self.root.record:    #no input yet, and start with a
putloop(): dummy root
            if len(mpaths) == 1:
                self.root.append(node.Node(mpaths[0]))
                return self.root.children[-1]
            else: #TODO: what if self.root.record is None and len(mpaths) >
1?
                raise botslib.MpathRootError('putloop("%s"): mpath too
long???'%(str(mpaths)))
        return self.root.putloop(*mpaths)

    def sort(self,*mpaths):
        if self.root.record is None:
            raise botslib.MpathRootError('get("%s"): "root" of message is
empty; either split messages or use inn.getloop'%(str(mpaths)))
        self.root.sort(*mpaths)

    def normalisetree(self,node):
        ''' The node tree is check, sorted, fields are formated etc.
            Always use this method before writing output.
        '''
        #~ node.display()
        #~ print 'normalisetree'
        self._checktree(node,self.defmessage.structure[0])
        self._canonicaltree(node,self.defmessage.structure[0])

    def _checktree(self,tree,structure):
        ''' checks tree with table:
            -   all records should be in table at the right place in
hierarchy
            -   for each record, all fields should be in grammar
            This function checks the root of grammar-structure with root of
node tree
        '''
        if tree.record['BOTSID'] == structure[ID]:
            #check tree recursively with structure
            self._checktreecore(tree,structure)
        else:
            raise botslib.MessageError('(Root)record %s of %s not in table
%s'%(tree.record['BOTSID'],tree.record,self.defmessage.grammarname))

    def _checktreecore(self,node,structure):
        ''' recursive
        '''
        deletelist=[]
        self._checkfields(node.record,structure)
        if node.children and not LEVEL in structure:
            if self.ta_info['checkunknownentities']:
                raise botslib.MessageError('Record "%s" in message has
children, but structure of grammar "%s" not. Found gg
"%s".'%(node.record['BOTSID'],self.defmessage.grammarname,node.children[0].record['BOTSID']))
            node.children=[]
            return
        for childnode in node.children:          #for every node:
            for structure_record in structure[LEVEL]:           #search in
grammar-records
                if childnode.record['BOTSID'] == structure_record[ID]:   #if
found right structure_record
                    #check children recursive
                    self._checktreecore(childnode,structure_record)
                    break    #check next mpathnode
            else:   #checked all structure_record in grammar, but nothing
found
                if self.ta_info['checkunknownentities']:
                    raise botslib.MessageError('Record "%s" in message not
in structure of grammar "%s". Whole record:
"%s".'%(childnode.record['BOTSID'],self.defmessage.grammarname,childnode.record))
                deletelist.append(childnode)
        for child in deletelist:
            node.children.remove(child)


    def _checkfields(self,record,structure_record):
        ''' checks for every field in record if field exists in
structure_record (from grammar).
        '''
        deletelist=[]
        for field in record.keys():          #all fields in record should
exist in structure_record
            for grammarfield in structure_record[FIELDS]:
                if grammarfield[ISFIELD]:    #if field (no composite)
                    if field == grammarfield[ID]:
                        break
                else:   #if composite
                    for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
subfields
                        if field == grammarsubfield[ID]:
                            break
                    else:
                        continue
                    break
            else:
                if self.ta_info['checkunknownentities']:
                    raise botslib.MessageError('Field "%s" does not exist in
record: %s'%(field,structure_record[MPATH]))
                    #~ raise botslib.MessageError('Field "%s" does not exist
in record: %s'%(field,structure_record[ID]))       #alt voor MPATH
                    #~ raise botslib.MessageError('Field "%s" does not exist
in record: %s'%(field,structure_record[FIELDS]))   #folder, text is too long
                deletelist.append(field)
        for field in deletelist:
            del record[field]

    def _canonicaltree(self,node,structure,headerrecordnumber=0):
        ''' For nodes: check min and max occurence; sort the nodes conform
grammar
            For fields: check M/C; format the fields.
        '''
        sortednodelist = []
        self._canonicalfields(node.record,structure,headerrecordnumber)
 #write the fields
        if LEVEL in structure:
            for structure_record in structure[LEVEL]:  #for structure_record
of this level in grammar
                count = 0                           #count number of
occurences of record
                for childnode in node.children:            #for every node
in mpathtree; SPEED: delete nodes from list when found
                    if childnode.record['BOTSID'] != structure_record[ID]:
#if it is not the right NODE":
                        continue
                    count += 1

 self._canonicaltree(childnode,structure_record,self.recordnumber)
#use rest of index in deeper level
                    sortednodelist.append(childnode)
                if structure_record[MIN] > count:
                    raise botslib.MessageError('Record "%s": mandatory but
not present.'%(structure_record[MPATH]))
                if structure_record[MAX] < count:
                    raise botslib.MessageError('Record "%s": occures to
often (%s times).'%(structure_record[MPATH],count))
            node.children=sortednodelist
            if hasattr(self,'do_queries'):
                self.do_queries(node,structure)

    def
_canonicalfields(self,noderecord,structure_record,headerrecordnumber):
        ''' For fields: check M/C; format the fields. Field are not sorted
here (a dict can not be sorted)
        '''
        #~ print noderecord
        for grammarfield in structure_record[FIELDS]:
            if grammarfield[ISFIELD]:    #if field (no composite)
                value = noderecord.get(grammarfield[ID],'')
                #~ print 'check field',grammarfield,value
                if not value:
                    if grammarfield[MANDATORY] == 'M':
                        raise botslib.MessageError('Record "%s": mandatory
field "%s" not filled.'%(structure_record[MPATH],grammarfield[ID]))
                    elif not grammarfield[MINLENGTH]:   #if minlength=0
                        continue
                noderecord[grammarfield[ID]] =
self._formatfield(value,grammarfield,structure_record)
            else:               #if composite
                compositefilled = False
                for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
subfields to see if one of them is there
                    if noderecord.get(grammarsubfield[ID],''):
                        compositefilled = True
                if not compositefilled:
                    if grammarfield[MANDATORY]=='M':
                        raise botslib.MessageError('Record "%s": mandatory
composite "%s" not filled.'%(structure_record[MPATH],grammarfield[ID]))
                    continue
                for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
subfields
                    value = noderecord.get(grammarsubfield[ID],'')
                    #~ print 'check subfield',grammarsubfield,value
                    if not value:
                        if grammarsubfield[MANDATORY]=='M':
                            #~ print 'Record "%s": mandatory subfield "%s"
not filled: "%s".'%(structure_record[MPATH],grammarsubfield[ID],noderecord)
                            raise botslib.MessageError('Record "%s":
mandatory subfield "%s" not filled:
"%s".'%(structure_record[MPATH],grammarsubfield[ID],noderecord))
                        else:
                            continue
                    noderecord[grammarsubfield[ID]] =
self._formatfield(value,grammarsubfield,structure_record)
                    #~ print 'fill',grammarfield[ID]

Thanks in advance.

Jim
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From aotto1968 at t-online.de  Wed May 20 04:52:25 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Wed, 20 May 2009 10:52:25 +0200
Subject: PYTHONPATH on Windows XP module load problem
References: <guubg7$nnk$03$1@news.t-online.com>
	<mailman.390.1242742113.8015.python-list@python.org>
	<guuh3f$47k$00$1@news.t-online.com>
	<SbSdncYZUsrgT4_XnZ2dnUVZ_s2dnZ2d@pdx.net>
Message-ID: <gv0gca$tlf$00$1@news.t-online.com>

Hi,

  after we know how your "bathroom" looks like ...

  I have done additional research.

        1. setup a "setup.py" script
        2. compiled the extension
        3. copy the extension to the test directory
                -> cp ../pymsgque/build/lib.win32-3.0-pydebug/pymsgque.pyd .
        4. start the test

$ python_d.exe ./server.py
Traceback (most recent call last):
  File "./server.py", line 13, in <module>
    import pymsgque
ImportError: No module named pymsgque
[31909 refs]

        -> same as before

        Question:

        -> is the module was not found or
                could a found module not be loaded

mfg

  Andreas Otto


From mohammed.abosalim at gmail.com  Wed May 20 05:05:16 2009
From: mohammed.abosalim at gmail.com (abosalim)
Date: Wed, 20 May 2009 02:05:16 -0700 (PDT)
Subject: SpellChecker
Message-ID: <e48864a4-1d8c-4239-8a8d-f19b85bd51ee@f16g2000vbf.googlegroups.com>

I used this code.It works fine,but on word not whole text.I want to
extend this code to correct
text file not only a word,but i don't know.If you have any help,please
inform me.

This is the code:

import re, collections

def words(text): return re.findall('[a-z]+', text.lower())

def train(features):
    model = collections.defaultdict(lambda: 1)
    for f in features:
        model[f] += 1
    return model

NWORDS = train(words(file('big.txt').read()))

alphabet = 'abcdefghijklmnopqrstuvwxyz'

def edits1(word):
    n = len(word)
    return set([word[0:i]+word[i+1:] for i in range(n)]
+                     # deletion
               [word[0:i]+word[i+1]+word[i]+word[i+2:] for i in range
(n-1)] + # transposition
               [word[0:i]+c+word[i+1:] for i in range(n) for c in
alphabet] + # alteration
               [word[0:i]+c+word[i:] for i in range(n+1) for c in
alphabet])  # insertion

def known_edits2(word):
    return set(e2 for e1 in edits1(word) for e2 in edits1(e1) if e2 in
NWORDS)

def known(words): return set(w for w in words if w in NWORDS)

def correct(word):
    candidates = known([word]) or known(edits1(word)) or known_edits2
(word) or [word]
    return max(candidates, key=lambda w: NWORDS[w])


From mike_kazantsev at fraggod.net  Wed May 20 05:11:39 2009
From: mike_kazantsev at fraggod.net (Mike Kazantsev)
Date: Wed, 20 May 2009 15:11:39 +0600
Subject: Yet another question about class property.
In-Reply-To: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>
References: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>
Message-ID: <4A13C94B.2060805@fraggod.net>

Jim Qiu wrote:
> Hi everyone,
> 
> Following is the code i am reading, i don't see anywhere the declaration of
> Message.root object,
> Where is it from?
...

Prehaps it gets assigned by the parent itself?
Like this:

  def spawn_child(self):
    child = Message()
    child.root = self

-- 
Mike Kazantsev // fraggod.net

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From deets at nospam.web.de  Wed May 20 05:25:36 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 20 May 2009 11:25:36 +0200
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
	<4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>
	<3b84542c-7746-498d-8d9e-977deaecfc1d@r3g2000vbp.googlegroups.com>
	<77g46cF1h8ffnU1@mid.uni-berlin.de>
	<954320a5-10ef-41f3-8a08-c1163be19206@e23g2000vbe.googlegroups.com>
Message-ID: <77i0gcF1etbmmU1@mid.uni-berlin.de>

Paul Boddie wrote:

> On 19 Mai, 18:16, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>>
>> Sorry to say so, but that's nonsense. DOM is not complicated because it
>> contains anything superior - the reason (if any) is that it is formulated
>> as language-agnostic as possible, with the unfortunate result it is
>> rather clumsy to use in all languages.
> 
> Although I presume that people really mean the core standards when
> they talk about "the DOM", not all the other ones related to those
> core standards, the API is not to everyone's taste because, amongst
> other things, it uses functions and methods when some people would
> rather use properties (which actually appear in various places in the
> standards, so it isn't as if the W3C haven't heard of such things),
> and for lots of other subjective reasons: some I can agree with, some
> I put at the same level as a lot of the API-posturing in numerous
> domains where Python code gets written, where such code jostles above
> all other concerns for the coveted "Pythonic" label.
> 
> However, when people are actually choosing to use DOM-related
> technologies, and when those technologies do not necessarily have
> equivalents in whatever other technology stack that could be
> suggested, can we not just take it as read that they actually know
> that the DOM isn't very nice (or that other people don't think that
> it's very nice) and that there are alternatives to the core stuff
> (especially when the inquirer has actually indicated his familiarity
> with those alternatives) and that reminding everyone for the nth time
> about how bad the DOM is (for whatever tangential purpose only
> partially related to the topic under discussion) adds very little if
> anything in the way of advice? It's like someone saying that they're
> going to fly the Atlantic in a 747 only to be told that they should
> drive a Lexus because "Boeing make terrible cars".
> 
> Feel free to replace "DOM" in the above with whatever else fits,
> because this kind of thing comes up all the time.

You could have wrote that same reply when the OP stated that 

"""
It [DOM] might be more
complicated, but that's probably because lots of very smart people
thought about it very carefully and it couldn't be made any simpler.
"""

Which is another way of saying "I know X, but Y is better." 

Also, not trying to convince people that there are better alternatives to
what and how they do something (admittedly, better is subjective, thus
ensues discussion), or gathering arguments on why they do believe their way
is preferable is the very essence of fora like this - if you'd really want
that to go away, we're down to answering the notorious
mutable-default-argument-question.

Diez


From pierre.imbaud at gmail.com  Wed May 20 05:34:53 2009
From: pierre.imbaud at gmail.com (Imbaud Pierre)
Date: Wed, 20 May 2009 11:34:53 +0200
Subject: monitoring friendly applications
Message-ID: <4a13cebd$0$9377$426a74cc@news.free.fr>

I have A LOT of batch applications to monitor, on linux machines, mostly 
written in python.
I have to know:
- which are active, at a given moment?
- when did the last run occur? How long did it last?
- for some daemons: are they stuck? generally, waiting for i/o, or lost 
in some C call.

I could do this (I partly did, btw) thru external processes tools. But 
most processes are python programs, making slight changes is not a 
problem. Thats why I think a python library could help me here; let us 
call it mfa (for monitor friendly application); then one call to 
mfa.in() at start (or at import?), mfa.out() at exit (maybe even on 
exception?), and possibly mfa.loop(), for loop managed daemons. the 
library would open a pipe, or a flow (to a file, a centralizing process, 
a database, a log), and every call make a dated entry. Ideally, the 
application should not be aware of the implementation, especially the 
repository being a file or a db.
Another aspect of process management can be endorsed by the library: 
sometimes only one instance of the process should be active, then 
withdraw if already running.
Not a lot of code to write, but careful design, to keep things simple, 
reliable, only add a low overhead, etc.
By any chance, does something like this exist? Would someone be 
interested with this development?


From __peter__ at web.de  Wed May 20 05:36:25 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 20 May 2009 11:36:25 +0200
Subject: SpellChecker
References: <e48864a4-1d8c-4239-8a8d-f19b85bd51ee@f16g2000vbf.googlegroups.com>
Message-ID: <gv0iuf$db0$02$1@news.t-online.com>

abosalim wrote:

> I used this code.It works fine,but on word not whole text.I want to
> extend this code to correct
> text file not only a word,but i don't know.If you have any help,please
> inform me.

import re
import sys

def correct(word, _lookup={"teh": "the"}):
    """
    Replace with Norvig's implementation found at

    http://norvig.com/spell-correct.html
    """
    return _lookup.get(word.lower(), word)

def correct_word(word):
    corrected = correct(word)
    if corrected != word:
        if word.istitle():
            corrected = corrected.title()
        if word.isupper():
            corrected = corrected.upper()
        print >> sys.stderr, "correcting", word, "-->", corrected
    return corrected

def sub_word(match):
    return correct_word(match.group())

def correct_text(text):
    return re.compile("[a-z]+", re.I).sub(sub_word, text)

if __name__ == "__main__":
    text = "Teh faster teh better TEH BIGGER"
    print "original:", text
    print "corrected:", correct_text(text)


Peter

PS: Don't you get bored if you have all your code written for you?




From mike_kazantsev at fraggod.net  Wed May 20 05:37:25 2009
From: mike_kazantsev at fraggod.net (Mike Kazantsev)
Date: Wed, 20 May 2009 15:37:25 +0600
Subject: SpellChecker
In-Reply-To: <e48864a4-1d8c-4239-8a8d-f19b85bd51ee@f16g2000vbf.googlegroups.com>
References: <e48864a4-1d8c-4239-8a8d-f19b85bd51ee@f16g2000vbf.googlegroups.com>
Message-ID: <4A13CF55.1000607@fraggod.net>

abosalim wrote:
> I used this code.It works fine,but on word not whole text.I want to
> extend this code to correct
> text file not only a word,but i don't know.If you have any help,please
> inform me.
...
> def correct(word):
>     candidates = known([word]) or known(edits1(word)) or known_edits2
> (word) or [word]
>     return max(candidates, key=lambda w: NWORDS[w])

Here I assume that "word" is any string consisting of letters, feel free
to add your own check in place of str.isalpha, like word length or case.
Note that simple ops like concatenation work much faster with buffers
than str / unicode.

  text = 'some text to correct (anything, really)'
  result = buffer('')

  word, c = buffer(''), ''
  for c in text:
    if c.isalpha(): word += c
    else:
      if word:
        result += correct(word)
        word = buffer('')
      result += c

-- 
Mike Kazantsev // fraggod.net

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From paul at boddie.org.uk  Wed May 20 05:39:56 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Wed, 20 May 2009 02:39:56 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
	<7x7i0cmmmk.fsf@ruckus.brouhaha.com> 
	<7f80a17e-1081-46ee-8581-109ca62bdfb7@z5g2000vba.googlegroups.com> 
	<pan.2009.05.20.05.57.39@REMOVE.THIS.cybersource.com.au>
Message-ID: <f7e59ddd-bd0b-42bc-ba78-08f603d47288@o14g2000vbo.googlegroups.com>

On 20 Mai, 07:57, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
>
> Can you explain how you can tell that there are no side-effects from
> x*sqrt(x)+3 ? What if I have this?
>
> class Funny(object):
> ? ? def __add__(self, other):
> ? ? ? ? global parrot
> ? ? ? ? parrot += 1
> ? ? ? ? return 5 + other
>
> x = Funny()

Yes, in general you need whole-program analysis with Python to know if
there are any side-effects or not. That said, with a process forking
mechanism where modified "globals" are not global beyond each process,
you should be able to guard against side-effects more effectively.

Paul


From conra2004 at yahoo.com  Wed May 20 06:00:04 2009
From: conra2004 at yahoo.com (yadin)
Date: Wed, 20 May 2009 03:00:04 -0700 (PDT)
Subject: finding repeated data sequences in a column
Message-ID: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>

Good day everyone!
I have a a table, from where I can extract a column.
I wanna go down trough that column made of numbers
examine undetermined chunks of data and see or detect if that sequence
of chunk
of data has been repeated before
and if it has been repeated detect it by giving it a name in an
adjacent column.
Imagine someting like this but made of 1800 numbers... how can I build
up column 3(category)

Item	price	          Category
400	1000028706	A
400	1000028707	A
400	1000028708	A
101	100	                C
101	12	                C
500	1000028706	A
500	1000028707	A
500	1000028708	A
500	1000028709	B
120	1000028706	A
120	1000028707	A
120	1000028708	A
120	100	                C
120	12	                C


From davea at ieee.org  Wed May 20 06:00:20 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 20 May 2009 06:00:20 -0400
Subject: Yet another question about class property.
In-Reply-To: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>
References: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>
Message-ID: <4A13D4B4.3030809@ieee.org>

Jim Qiu wrote:
> Hi everyone,
>
> Following is the code i am reading, i don't see anywhere the declaration of
> Message.root object,
> Where is it from?
>
> #bots-modules
> import bots.botslib as botslib
> import bots.node as node
> from bots.botsconfig import *
>
>
> class Message(object):
>     ''' abstract class; represents a edi message.
>         is subclassed as outmessage or inmessage object.
>     '''
>     def __init__(self):
>         self.recordnumber=0                #segment counter. Is not used for
> UNT of SE record; some editypes want sequential recordnumbering
>
>     @staticmethod
>     def display(records):
>         '''for debugging lexed records.'''
>         for record in records:
>             t = 0
>             for veld in record:
>                 if t==0:
>                     print '%s    (Record-id)'%(veld[VALUE])
>                 else:
>                     if veld[SFIELD]:
>                         print '        %s    (sub)'%(veld[VALUE])
>                     else:
>                         print '    %s    (veld)'%(veld[VALUE])
>                 t += 1
>
>     def get(self,*mpaths):
>         ''' query tree (self.root) with mpath; get value (string); get None
> if not found.'''
>         if self.root.record is None:
>             raise botslib.MpathRootError('get("%s"): "root" of incoming
> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>         return self.root.get(*mpaths)
>
>     def getnozero(self,*mpaths):
>         ''' like get, returns None is value is zero (0) or not numeric.
>             Is sometimes usefull in mapping.'''
>         if self.root.record is None:
>             raise botslib.MpathRootError('get("%s"): "root" of incoming
> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>         return self.root.getnozero(*mpaths)
>
>     def getindicator(self,ind,*mpaths):
>         ''' like get, returns None is value is zero (0) or not numeric.
>             Is sometimes usefull in mapping.'''
>         if self.root.record is None:
>             raise botslib.MpathRootError('get("%s"): "root" of incoming
> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>         return self.root.getindicator(ind,*mpaths)
>
>     def getcount(self):
>         ''' count number of nodes in self.root. Number of nodes is number of
> records.'''
>         return self.root.getcount()
>
>     def getcountoccurrences(self,*mpaths):
>         ''' count number of nodes in self.root. Number of nodes is number of
> records.'''
>         count = 0
>         for value in self.getloop(*mpaths):
>             count += 1
>         return count
>
>     def getcountsum(self,*mpaths):
>         ''' return the sum for all values found in mpath. Eg total number of
> ordered quantities.'''
>         if self.root.record is None:
>             raise botslib.MpathRootError('get("%s"): "root" of incoming
> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>         return self.root.getcountsum(*mpaths)
>
>     def getloop(self,*mpaths):
>         ''' query tree with mpath; generates all the nodes. Is typically
> used as: for record in inn.get(mpath):
>         '''
>         if self.root.record:    #self.root is a real root
>             for terug in self.root.getloop(*mpaths): #search recursive for
> rest of mpaths
>                 yield terug
>         else:   #self.root is dummy root
>             for childnode in self.root.children:
>                 for terug in childnode.getloop(*mpaths): #search recursive
> for rest of mpaths
>                     yield terug
>
>     def put(self,*mpaths):
>         if self.root.record is None and self.root.children:
>             raise botslib.MpathRootError('put("%s"): "root" of outgoing
> message is empty; use out.putloop'%(str(mpaths)))
>         return self.root.put(*mpaths)
>
>     def putloop(self,*mpaths):
>         if not self.root.record:    #no input yet, and start with a
> putloop(): dummy root
>             if len(mpaths) == 1:
>                 self.root.append(node.Node(mpaths[0]))
>                 return self.root.children[-1]
>             else: #TODO: what if self.root.record is None and len(mpaths) >
> 1?
>                 raise botslib.MpathRootError('putloop("%s"): mpath too
> long???'%(str(mpaths)))
>         return self.root.putloop(*mpaths)
>
>     def sort(self,*mpaths):
>         if self.root.record is None:
>             raise botslib.MpathRootError('get("%s"): "root" of message is
> empty; either split messages or use inn.getloop'%(str(mpaths)))
>         self.root.sort(*mpaths)
>
>     def normalisetree(self,node):
>         ''' The node tree is check, sorted, fields are formated etc.
>             Always use this method before writing output.
>         '''
>         #~ node.display()
>         #~ print 'normalisetree'
>         self._checktree(node,self.defmessage.structure[0])
>         self._canonicaltree(node,self.defmessage.structure[0])
>
>     def _checktree(self,tree,structure):
>         ''' checks tree with table:
>             -   all records should be in table at the right place in
> hierarchy
>             -   for each record, all fields should be in grammar
>             This function checks the root of grammar-structure with root of
> node tree
>         '''
>         if tree.record['BOTSID'] == structure[ID]:
>             #check tree recursively with structure
>             self._checktreecore(tree,structure)
>         else:
>             raise botslib.MessageError('(Root)record %s of %s not in table
> %s'%(tree.record['BOTSID'],tree.record,self.defmessage.grammarname))
>
>     def _checktreecore(self,node,structure):
>         ''' recursive
>         '''
>         deletelist=[]
>         self._checkfields(node.record,structure)
>         if node.children and not LEVEL in structure:
>             if self.ta_info['checkunknownentities']:
>                 raise botslib.MessageError('Record "%s" in message has
> children, but structure of grammar "%s" not. Found gg
> "%s".'%(node.record['BOTSID'],self.defmessage.grammarname,node.children[0].record['BOTSID']))
>             node.children=[]
>             return
>         for childnode in node.children:          #for every node:
>             for structure_record in structure[LEVEL]:           #search in
> grammar-records
>                 if childnode.record['BOTSID'] == structure_record[ID]:   #if
> found right structure_record
>                     #check children recursive
>                     self._checktreecore(childnode,structure_record)
>                     break    #check next mpathnode
>             else:   #checked all structure_record in grammar, but nothing
> found
>                 if self.ta_info['checkunknownentities']:
>                     raise botslib.MessageError('Record "%s" in message not
> in structure of grammar "%s". Whole record:
> "%s".'%(childnode.record['BOTSID'],self.defmessage.grammarname,childnode.record))
>                 deletelist.append(childnode)
>         for child in deletelist:
>             node.children.remove(child)
>
>
>     def _checkfields(self,record,structure_record):
>         ''' checks for every field in record if field exists in
> structure_record (from grammar).
>         '''
>         deletelist=[]
>         for field in record.keys():          #all fields in record should
> exist in structure_record
>             for grammarfield in structure_record[FIELDS]:
>                 if grammarfield[ISFIELD]:    #if field (no composite)
>                     if field == grammarfield[ID]:
>                         break
>                 else:   #if composite
>                     for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
> subfields
>                         if field == grammarsubfield[ID]:
>                             break
>                     else:
>                         continue
>                     break
>             else:
>                 if self.ta_info['checkunknownentities']:
>                     raise botslib.MessageError('Field "%s" does not exist in
> record: %s'%(field,structure_record[MPATH]))
>                     #~ raise botslib.MessageError('Field "%s" does not exist
> in record: %s'%(field,structure_record[ID]))       #alt voor MPATH
>                     #~ raise botslib.MessageError('Field "%s" does not exist
> in record: %s'%(field,structure_record[FIELDS]))   #folder, text is too long
>                 deletelist.append(field)
>         for field in deletelist:
>             del record[field]
>
>     def _canonicaltree(self,node,structure,headerrecordnumber=0):
>         ''' For nodes: check min and max occurence; sort the nodes conform
> grammar
>             For fields: check M/C; format the fields.
>         '''
>         sortednodelist = []
>         self._canonicalfields(node.record,structure,headerrecordnumber)
>  #write the fields
>         if LEVEL in structure:
>             for structure_record in structure[LEVEL]:  #for structure_record
> of this level in grammar
>                 count = 0                           #count number of
> occurences of record
>                 for childnode in node.children:            #for every node
> in mpathtree; SPEED: delete nodes from list when found
>                     if childnode.record['BOTSID'] != structure_record[ID]:
> #if it is not the right NODE":
>                         continue
>                     count += 1
>
>  self._canonicaltree(childnode,structure_record,self.recordnumber)
> #use rest of index in deeper level
>                     sortednodelist.append(childnode)
>                 if structure_record[MIN] > count:
>                     raise botslib.MessageError('Record "%s": mandatory but
> not present.'%(structure_record[MPATH]))
>                 if structure_record[MAX] < count:
>                     raise botslib.MessageError('Record "%s": occures to
> often (%s times).'%(structure_record[MPATH],count))
>             node.children=sortednodelist
>             if hasattr(self,'do_queries'):
>                 self.do_queries(node,structure)
>
>     def
> _canonicalfields(self,noderecord,structure_record,headerrecordnumber):
>         ''' For fields: check M/C; format the fields. Field are not sorted
> here (a dict can not be sorted)
>         '''
>         #~ print noderecord
>         for grammarfield in structure_record[FIELDS]:
>             if grammarfield[ISFIELD]:    #if field (no composite)
>                 value = noderecord.get(grammarfield[ID],'')
>                 #~ print 'check field',grammarfield,value
>                 if not value:
>                     if grammarfield[MANDATORY] == 'M':
>                         raise botslib.MessageError('Record "%s": mandatory
> field "%s" not filled.'%(structure_record[MPATH],grammarfield[ID]))
>                     elif not grammarfield[MINLENGTH]:   #if minlength=0
>                         continue
>                 noderecord[grammarfield[ID]] =
> self._formatfield(value,grammarfield,structure_record)
>             else:               #if composite
>                 compositefilled = False
>                 for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
> subfields to see if one of them is there
>                     if noderecord.get(grammarsubfield[ID],''):
>                         compositefilled = True
>                 if not compositefilled:
>                     if grammarfield[MANDATORY]=='M':
>                         raise botslib.MessageError('Record "%s": mandatory
> composite "%s" not filled.'%(structure_record[MPATH],grammarfield[ID]))
>                     continue
>                 for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
> subfields
>                     value = noderecord.get(grammarsubfield[ID],'')
>                     #~ print 'check subfield',grammarsubfield,value
>                     if not value:
>                         if grammarsubfield[MANDATORY]=='M':
>                             #~ print 'Record "%s": mandatory subfield "%s"
> not filled: "%s".'%(structure_record[MPATH],grammarsubfield[ID],noderecord)
>                             raise botslib.MessageError('Record "%s":
> mandatory subfield "%s" not filled:
> "%s".'%(structure_record[MPATH],grammarsubfield[ID],noderecord))
>                         else:
>                             continue
>                     noderecord[grammarsubfield[ID]] =
> self._formatfield(value,grammarsubfield,structure_record)
>                     #~ print 'fill',grammarfield[ID]
>
> Thanks in advance.
>
> Jim
>
>   
Unlike your previous question, this attribute is not referenced in 
__init__().  That, plus the comment about being an abstract class, leads 
me to guess that the derived classes are required to define this 
attribute.  That's one of the characteristics of an abstract class;  
some of the details are missing, and intended to be supplied by a child 
class.

What do the docs for this abstract class say?  If they don't discuss how 
to implement a concrete class, they're sadly lacking.



From bearophileHUGS at lycos.com  Wed May 20 06:16:49 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Wed, 20 May 2009 03:16:49 -0700 (PDT)
Subject: finding repeated data sequences in a column
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>
Message-ID: <b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>

yadin, understanding what you want is probably 10 times harder than
writing down the code :-)

> I have a a table, from where I can extract a column.

You can extract it? Or do you want to extract it? Or do you want to
process it? Etc.


> I wanna go down trough that column made of numbers
> examine undetermined chunks of data and see or detect if that sequence
> of chunk
> of data has been repeated before

What do you mean by "undetermined"? What kind of data? Where is this
data? How is this "chunk" shaped? Are you talking about a string?


> and if it has been repeated detect it by giving it a name in an
> adjacent column.

What kind of name? So you just need 2 names, like N and S for New and
Seen?
You can use a built-in set data structure to know if you have already
seen some data, while you scan the records.


> Imagine someting like this but made of 1800 numbers...

How are such 1800 disposed? Do you mean 1800 columns of 32 bit
numbers?


> how can I build up column 3(category)<

What does A, B and C mean?

Bye,
bearophile


From piet at cs.uu.nl  Wed May 20 07:08:22 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 20 May 2009 13:08:22 +0200
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
Message-ID: <m2ljosav6h.fsf@cs.uu.nl>

>>>>> walterbyrd <walterbyrd at iname.com> (w) wrote:

>w> On May 8, 5:55?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
>>> On May 8, 3:03?pm,walterbyrd<walterb... at iname.com> wrote:
>>> 
>>> > This works, but it seems like there should be a better way.
>>> 
>>> > --------------
>>> > week = ['sun','mon','tue','wed','thu','fri','sat']
>>> > for day in week[week.index('tue'):week.index('fri')]:
>>> > ? ?print day
>>> > ---------------
>>> 
>>> I think you should provide much more information, primarily why you
>>> want to do this. ?What is the larger goal you are trying to achieve?

>w> I am just looking for a less verbose, more elegant, way to print a
>w> slice of a list. What is hard to understand about that? I am not sure
>w> how enumerated types help.

You didn't say that in the OP.

But you can extend the list type to accept slices with strings in them.
The language spec says they should be ints but apparently this is not
enforced. Of course this makes it vulnerable for future misbehaviour.

class KeyList(list):
    def __getitem__(self, indx):
        if isinstance(indx, slice):
            start = indx.start
            stop = indx.stop
            # add support for step if you want
            if not isinstance(start, int):
                start = self.index(start)
            if not isinstance(stop, int):
                stop = self.index(stop)
            return list.__getitem__(self, slice(start,stop))
        return list.__getitem__(self, indx)

week = KeyList(['sun','mon','tue','wed','thu','fri','sat'])
for day in week['tue':'fri']:
   print day

tue
wed
thu

Note that 'fri' is not included according to standard Python conventions
about the end of a slice. Change the code if you are not happy with it
and you don't mind getting inconsistent semantics.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From jonathan.cervidae at gmail.com  Wed May 20 07:32:01 2009
From: jonathan.cervidae at gmail.com (jcervidae)
Date: Wed, 20 May 2009 04:32:01 -0700 (PDT)
Subject: How do I make pprint do this
Message-ID: <ecb09aa3-abb6-4bc1-9f54-0d312e542266@f16g2000vbf.googlegroups.com>

I cannot get pprint to format output how I would like. pydb does. I
tried grepping the source but still couldn't grok it. Here:

(Pydb) a = range(1,100)
(Pydb) pp a
[1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10, 11, 12, 13, 14, 15, 16, 17,
18, 19, 20
 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
38, 39, 40
 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
58, 59, 60
 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77,
78, 79...]

It puts multiple elements on the same line. I can't work out how to
make it do that.


From nytrokiss at gmail.com  Wed May 20 07:36:36 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Wed, 20 May 2009 14:36:36 +0300
Subject: How to get Form values in Python code and Send Email
In-Reply-To: <8ca278430905192252g67008d31qcd1da318674e30e1@mail.gmail.com>
References: <8ca278430905192252g67008d31qcd1da318674e30e1@mail.gmail.com>
Message-ID: <8a6b8e350905200436s6a31c8dap96d6fededa451b3@mail.gmail.com>

Why don't you use Django? If you get the form information from Django you
can send an email using the send_mail (or even if you don't you can still
import the function.



On Wed, May 20, 2009 at 8:52 AM, Kalyan Chakravarthy <
kalyanchakravarthy at hyit.com> wrote:

> Hi All,
>
>     I have one doubt, I have feedback form (HTML Page) in one website user
> enters all the details and after submitting the page, in back end Python
> class i want to get all those data and send to one email id.
>
> for this please any one can guide me how to do it in  Python( how to get
> HTML form data in Python and send those data as an Email) and Google Apps
>
> Thanks in advance
>
> --
> Regards
> Kalyan
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
http://www.astorandblack.com
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From route6 at ouvaton.org  Wed May 20 07:40:08 2009
From: route6 at ouvaton.org (route6 at ouvaton.org)
Date: Wed, 20 May 2009 04:40:08 -0700 (PDT)
Subject: White NaNs with pcolor (matplotlib)
Message-ID: <24862fcf-522b-4a3c-a35b-881f36cd7066@n8g2000vbb.googlegroups.com>

Hi,

I am trying to display the NaNs in white color when I plot a data map
using pcolor with matplotlib. Does anyone know how to do that? By
default the NaNs are displayed in the color corresponding to the
lowest value in the colorbar.

Thanks,
C


From vinay_sajip at yahoo.co.uk  Wed May 20 08:15:49 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Wed, 20 May 2009 05:15:49 -0700 (PDT)
Subject: Problems with import hooks and encoding
Message-ID: <11597c9b-389b-4a4c-9e64-a52285bbbce8@s28g2000vbp.googlegroups.com>

The simple program

#--------------------------------------
 def main():
     print repr(u'\u2029'.encode('utf-8'))

 if __name__ == "__main__":
     main()
#--------------------------------------

works as expected when run from the command-line, but fails when
converted to an executable using PyInstaller. (For example, if the
executable is created on a Ubuntu Jaunty system but then run on a
Ubuntu Hardy system.) Digging into why this happens leads to the
observation that Py_Initialize calls _PyUnicode_Init, which in turn
causes encodings to be imported via the _codecs module (codecs.c).
However, this appears to happen before the import hook machinery is
set up. Is there a way of intercepting the importing of encodings so
that a "freeze" processor like PyInstaller's launcher can redirect the
import to the package bundled with the executable, rather than any
package provided with a host-installed version of Python?

Regards,

Vinay Sajip


From kalyanchakravarthy at hyit.com  Wed May 20 08:19:47 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Wed, 20 May 2009 17:49:47 +0530
Subject: How to get Form values in Python code and Send Email
In-Reply-To: <8a6b8e350905200436s6a31c8dap96d6fededa451b3@mail.gmail.com>
References: <8ca278430905192252g67008d31qcd1da318674e30e1@mail.gmail.com>
	<8a6b8e350905200436s6a31c8dap96d6fededa451b3@mail.gmail.com>
Message-ID: <8ca278430905200519p7f4e2d10i6ec79b7d75d6dba8@mail.gmail.com>

Hi
    Now i can able to get the form details in to python code,

can any one tell me the format to send form values to one Emil id   ...  for
this  I required SMTP set up?

Thanks in advance

Regards
Kalyan


On Wed, May 20, 2009 at 5:06 PM, James Matthews <nytrokiss at gmail.com> wrote:

> Why don't you use Django? If you get the form information from Django you
> can send an email using the send_mail (or even if you don't you can still
> import the function.
>
>
>
> On Wed, May 20, 2009 at 8:52 AM, Kalyan Chakravarthy <
> kalyanchakravarthy at hyit.com> wrote:
>
>> Hi All,
>>
>>     I have one doubt, I have feedback form (HTML Page) in one website user
>> enters all the details and after submitting the page, in back end Python
>> class i want to get all those data and send to one email id.
>>
>> for this please any one can guide me how to do it in  Python( how to get
>> HTML form data in Python and send those data as an Email) and Google Apps
>>
>> Thanks in advance
>>
>> --
>> Regards
>> Kalyan
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
>
> --
> http://www.astorandblack.com
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
Regards
Kalyan
Mobile no: +91 9985351220
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From Ron.Barak at lsi.com  Wed May 20 08:31:03 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Wed, 20 May 2009 13:31:03 +0100
Subject: How to Spawn a process with P_NOWAIT and pass it some data ?
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A24F8@enbmail01.lsi.com>

Hi,

This is my first try at IPC in Python, and I would like to ask your help with the following problem:

I would like to spawn a process with P_NOWAIT, and pass some data to the child process.

I created two scripts to try IPC (in a blocking way):

$ cat subprocess_sender.py
#!/usr/bin/env python

import subprocess

proc = subprocess.Popen(["python", "-u", "subprocess_receiver.py"], stdin=subprocess.PIPE, shell=True)

proc.communicate(input="this is sent from subprocess_sender.py")[0]
proc.stdin.close()
and

$ cat subprocess_receiver.py
#!/usr/bin/env python

import sys

print sys.stdin.readline()
These scripts intercommunicate nicely:

$ python -u  subprocess_sender.py
this is sent from subprocess_sender.py
The example in the documentation is:
18.1.3.4. Replacing the os.spawn family?<http://docs.python.org/library/subprocess.html#replacing-the-os-spawn-family>

P_NOWAIT example:

pid = os.spawnlp(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg")
==>
pid = Popen(["/bin/mycmd", "myarg"]).pid

But, when I try it in my script:

$ cat subprocess_sender.py
#!/usr/bin/env python

import subprocess

proc = subprocess.Popen(["python", "-u", "subprocess_receiver.py"], stdin=subprocess.PIPE, shell=True).pid

proc.communicate(input="this is sent from subprocess_sender.py")[0]
proc.stdin.close()
proc is now changed from a subprocess.Popen object to an int, namely:

$ python -u  subprocess_sender.py
Traceback (most recent call last):
  File "subprocess_sender.py", line 7, in <module>
    proc.communicate(input="this is sent from subprocess_sender.py")[0]
AttributeError: 'int' object has no attribute 'communicate'
Can anyone suggest what is the correct way to implement P_NOWAIT and still be able to communicate with the child process ?
(Or, is there a way to create a subprocess.Popen object from what I assume is the process handle integer ?)

Thanks,
Ron.

The numbering of the scripts' lines:

$ cat -n subprocess_sender.py
     1  #!/usr/bin/env python
     2
     3  import subprocess
     4
     5  proc = subprocess.Popen(["python", "-u", "subprocess_receiver.py"], stdin=subprocess.PIPE, shell=True).pid
     6
     7  proc.communicate(input="this is sent from subprocess_sender.py")[0]
     8  proc.stdin.close()

$ cat -n subprocess_receiver.py
     1  #!/usr/bin/env python
     2
     3  import sys
     4
     5  print sys.stdin.readline()

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From steve.ferg.bitbucket at gmail.com  Wed May 20 08:33:50 2009
From: steve.ferg.bitbucket at gmail.com (Steve Ferg)
Date: Wed, 20 May 2009 05:33:50 -0700 (PDT)
Subject: Seeking old post on developers who like IDEs vs developers who 
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<6ZcQl.18366$Ux.8657@tornado.fastwebnet.it>
Message-ID: <b79415ee-5a8d-46ea-9341-e6b3101fd324@j12g2000vbl.googlegroups.com>

> I think you mean this clbuttic post:
> http://osteele.com/archives/2004/11/ides

That's it!  Thanks very much, Marco!!

It is good to read it again.  It is like visiting a place where you
grew up years ago, and finding that it is completely different than
the way you remember it.  It is surprising how much better it is than
my rather crude memory of it.



From jeanmichel at sequans.com  Wed May 20 08:56:38 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 20 May 2009 14:56:38 +0200
Subject: sqlite3, qmarks, and NULL values
In-Reply-To: <p06240801c638f39624e9@[10.0.1.221]>
References: <p06240801c638f39624e9@[10.0.1.221]>
Message-ID: <4A13FE06.4010906@sequans.com>

I fall into the same issue when using postgres. Your main concern is 
that NULL = NULL will return False. Could seems strange but it has much 
advantages sometimes, however this is not the purpose.
I found your solution quite acceptable. Just replace 'if y:' by 'if y is 
None:', add a comment to point that #NULL <> NULL to help any reader 
that is not familiar with db and you got a perfectly readable code.

Of course if you have more complex queries to build you'll have to think 
about an elegant way to manage NULL values. I personally iterate trough 
all my COLs and add a 'COL# = ?' if the value queried is not None. It 
works, it's readable, it's simple, it's python :o)

JM


Mitchell L Model wrote:
> Suppose I have a simple query in sqlite3 in a function:
>
>     def lookupxy(x, y):
>         conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
>                      (x, y))
>
> However, COL2 might be NULL. I can't figure out a value for y that would retrieve rows for which COL2 is NULL. It seems to me that I have to perform an awkward test to determine whether to execute a query with one question mark or two.
>
>     def lookupxy(x, y):
>         if y:
>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
>                          (x, y))
>         else:
>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 IS NULL",
>                          (x,))
>
> The more question marks involved the more complicated this would get, especially if question marks in the middle of several would sometimes need to be NULL. I hope I'm missing something and that someone can tell me what it is.
>   



From iainking at gmail.com  Wed May 20 09:01:31 2009
From: iainking at gmail.com (Iain King)
Date: Wed, 20 May 2009 06:01:31 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
Message-ID: <b11fc5da-fc34-4638-a3c8-dbb53048d386@t10g2000vbg.googlegroups.com>

On May 19, 10:24?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:
> > Let me clarify what I think par, pmap, pfilter and preduce would mean
> > and how they would be implemented.
>
> [...]
>
> Just for fun, I've implemented a parallel-map function, and done a couple
> of tests. Comments, criticism and improvements welcome!
>
> import threading
> import Queue
> import random
> import time
>
> def f(arg): ?# Simulate a slow function.
> ? ? time.sleep(0.5)
> ? ? return 3*arg-2
>
> class PMapThread(threading.Thread):
> ? ? def __init__(self, clients):
> ? ? ? ? super(PMapThread, self).__init__()
> ? ? ? ? self._clients = clients
> ? ? def start(self):
> ? ? ? ? super(PMapThread, self).start()
> ? ? def run(self):
> ? ? ? ? while True:
> ? ? ? ? ? ? try:
> ? ? ? ? ? ? ? ? data = self._clients.get_nowait()
> ? ? ? ? ? ? except Queue.Empty:
> ? ? ? ? ? ? ? ? break
> ? ? ? ? ? ? target, where, func, arg = data
> ? ? ? ? ? ? result = func(arg)
> ? ? ? ? ? ? target[where] = result
>
> class VerbosePMapThread(threading.Thread):
> ? ? def __init__(self, clients):
> ? ? ? ? super(VerbosePMapThread, self).__init__()
> ? ? ? ? print "Thread %s created at %s" % (self.getName(), time.ctime())
> ? ? def start(self):
> ? ? ? ? super(VerbosePMapThread, self).start()
> ? ? ? ? print "Thread %s starting at %s" % (self.getName(), time.ctime())
> ? ? def run(self):
> ? ? ? ? super(VerbosePMapThread, self).run()
> ? ? ? ? print "Thread %s finished at %s" % (self.getName(), time.ctime())
>
> def pmap(func, seq, verbose=False, numthreads=4):
> ? ? size = len(seq)
> ? ? results = [None]*size
> ? ? if verbose:
> ? ? ? ? print "Initiating threads"
> ? ? ? ? thread = VerbosePMapThread
> ? ? else:
> ? ? ? ? thread = PMapThread
> ? ? datapool = Queue.Queue(size)
> ? ? for i in xrange(size):
> ? ? ? ? datapool.put( (results, i, f, seq[i]) )
> ? ? threads = [PMapThread(datapool) for i in xrange(numthreads)]
> ? ? if verbose:
> ? ? ? ? print "All threads created."
> ? ? for t in threads:
> ? ? ? ? t.start()
> ? ? # Block until all threads are done.
> ? ? while any([t.isAlive() for t in threads]):
> ? ? ? ? if verbose:
> ? ? ? ? ? ? time.sleep(0.25)
> ? ? ? ? ? ? print results
> ? ? return results
>
> And here's the timing results:
>
> >>> from timeit import Timer
> >>> setup = "from __main__ import pmap, f; data = range(50)"
> >>> min(Timer('map(f, data)', setup).repeat(repeat=5, number=3))
> 74.999755859375
> >>> min(Timer('pmap(f, data)', setup).repeat(repeat=5, number=3))
>
> 20.490942001342773
>
> --
> Steven

I was going to write something like this, but you've beat me to it :)
Slightly different though; rather than have pmap collate everything
together then return it, have it yield results as and when it gets
them and stop iteration when it's done, and rename it to par to keep
the OP happy and you should get something like what he initially
requests (I think):

total = 0
for score in par(f, data):
    total += score


Iain


From jeanmichel at sequans.com  Wed May 20 09:07:46 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 20 May 2009 15:07:46 +0200
Subject: sqlite3, qmarks, and NULL values
In-Reply-To: <4A13FE06.4010906@sequans.com>
References: <p06240801c638f39624e9@[10.0.1.221]> <4A13FE06.4010906@sequans.com>
Message-ID: <4A1400A2.9040204@sequans.com>

Erratum:

please read 'if y is *not* None:'. (think that if y = 0, you won't 
execute the proper code block with 'if y:').

JM

Jean-Michel Pichavant wrote:
> I fall into the same issue when using postgres. Your main concern is 
> that NULL = NULL will return False. Could seems strange but it has 
> much advantages sometimes, however this is not the purpose.
> I found your solution quite acceptable. Just replace 'if y:' by 'if y 
> is None:', add a comment to point that #NULL <> NULL to help any 
> reader that is not familiar with db and you got a perfectly readable 
> code.
>
> Of course if you have more complex queries to build you'll have to 
> think about an elegant way to manage NULL values. I personally iterate 
> trough all my COLs and add a 'COL# = ?' if the value queried is not 
> None. It works, it's readable, it's simple, it's python :o)
>
> JM
>
>
> Mitchell L Model wrote:
>> Suppose I have a simple query in sqlite3 in a function:
>>
>>     def lookupxy(x, y):
>>         conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
>>                      (x, y))
>>
>> However, COL2 might be NULL. I can't figure out a value for y that 
>> would retrieve rows for which COL2 is NULL. It seems to me that I 
>> have to perform an awkward test to determine whether to execute a 
>> query with one question mark or two.
>>
>>     def lookupxy(x, y):
>>         if y:
>>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 
>> = ?",
>>                          (x, y))
>>         else:
>>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 
>> IS NULL",
>>                          (x,))
>>
>> The more question marks involved the more complicated this would get, 
>> especially if question marks in the middle of several would sometimes 
>> need to be NULL. I hope I'm missing something and that someone can 
>> tell me what it is.
>>   
>



From google at mrabarnett.plus.com  Wed May 20 09:47:03 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 20 May 2009 14:47:03 +0100
Subject: How to Spawn a process with P_NOWAIT and pass it some data ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF6701A24F8@enbmail01.lsi.com>
References: <7F0503CD69378F49BE0DC30661C6CCF6701A24F8@enbmail01.lsi.com>
Message-ID: <4A1409D7.8000403@mrabarnett.plus.com>

Barak, Ron wrote:
> Hi,
>  
> This is my first try at IPC in Python, and I would like to ask your help 
> with the following problem:
>  
> I would like to spawn a process with P_NOWAIT, and pass some data to the 
> child process.
>  
> I created two scripts to try IPC (in a blocking way):
>  
> $ cat subprocess_sender.py
> #!/usr/bin/env python
>  
> import subprocess
>  
> proc = subprocess.Popen(["python", "-u", "subprocess_receiver.py"], 
> stdin=subprocess.PIPE, shell=True)
>  
> proc.communicate(input="this is sent from subprocess_sender.py")[0]
> proc.stdin.close()
> and
>  
> $ cat subprocess_receiver.py
> #!/usr/bin/env python
>  
> import sys
>  
> print sys.stdin.readline()
> These scripts intercommunicate nicely:
>  
> $ python -u  subprocess_sender.py
> this is sent from subprocess_sender.py
> The example in the documentation is:
> 
> 
>       18.1.3.4. Replacing the os.spawn family?
>       <http://docs.python.org/library/subprocess.html#replacing-the-os-spawn-family>
> 
> P_NOWAIT example:
> 
> pid = os.spawnlp(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg")
> ==>
> pid = Popen(["/bin/mycmd", "myarg"]).pid
> 
[snip]
The documentation is showing the 'subprocess' equivalents of older calls
(the 'subprocess' module was added in Python 2.4).

This means is that "Popen" is equivalent to calling "spawnlp" with
P_NOWAIT.


From marco at sferacarta.com  Wed May 20 09:56:59 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Wed, 20 May 2009 15:56:59 +0200
Subject: sqlite3, qmarks, and NULL values
In-Reply-To: <mailman.424.1242778866.8015.python-list@python.org>
References: <mailman.424.1242778866.8015.python-list@python.org>
Message-ID: <L_TQl.20901$Ux.9860@tornado.fastwebnet.it>

Mitchell L Model wrote:

>     def lookupxy(x, y):
>         if y:
>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
>                          (x, y))
>         else:
>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 IS NULL",
>                          (x,))

> The more question marks involved the more complicated this would get, especially if question marks in the middle of several would sometimes need to be NULL. 


With SQLAlchemy you could write:

table.select().where((table.c.col1==x) & (table.c.col2==y))

where x or y are None, the sql engine generates the appropriate "IS 
NULL" clause.


> I hope I'm missing something and that someone can tell me what it is.


Yes, you are missing SQLAlchemy ;)


From invalid at invalid  Wed May 20 10:09:08 2009
From: invalid at invalid (Grant Edwards)
Date: Wed, 20 May 2009 09:09:08 -0500
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
	<bemdncWkNYTJEo_XnZ2dnUVZ_gZi4p2d@posted.usinternet>
	<pan.2009.05.20.03.29.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <Db2dnUEt1-uZkonXnZ2dnUVZ_jNi4p2d@posted.visi>

On 2009-05-20, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

>> Any Python function that isn't calling a library function written in C
>> that releases the GIL won't show any speedup will it?
>
> Not necessarily. Here's another function, that uses a loop instead of 
> sleep.
>
> def g(arg, SIZE=8*10**6):
>     # Default SIZE is chosen so that on my machine, the loop 
>     # takes approximately 0.5 second.
>     for x in xrange(SIZE):
>         pass
>     return 3*arg-2
>
>
>>>> setup = 'from __main__ import pmap, g; data = range(50)'
>>>> min(Timer('map(g, data)', setup).repeat(repeat=5, number=3))
> 65.093590974807739
>>>> min(Timer('pmap(g, data)', setup).repeat(repeat=5, number=3))
> 20.268381118774414

I find that surprising.  Evidently my understanding of the GIL
is wrong.

>> I don't have a multi-core machine to try it on, but what
>> happens when you replace your "slow function" code with
>> something that actually burns CPU using pure-Python code
>> instead of blocking on a timer in the OS?
>
> Two simple work-arounds are:
>
> * use Jython or IronPython; or
>
> * insert time.sleep(0.000001) into your function at various points.

While the latter will allow thread switching, I don't see how
it will increase thread parallelism.

-- 
Grant Edwards                   grante             Yow! WHO sees a BEACH BUNNY
                                  at               sobbing on a SHAG RUG?!
                               visi.com            


From TrevorOKennedy at gmail.com  Wed May 20 10:21:10 2009
From: TrevorOKennedy at gmail.com (Trevor)
Date: Wed, 20 May 2009 07:21:10 -0700 (PDT)
Subject: 2d barcode library?
Message-ID: <0d33db03-cc89-4057-bbc6-5a76dd4b8045@s20g2000vbp.googlegroups.com>

Is anyone aware of a good library for building 2d barcodes (any format
will work for me) and outputing them as some picture format,
presumably png or bmp to be used for html printing? For 1D barcodes a
simple barcode font will suffice, but obviously 2D is not so simple
and i have yet to find the appropriate tool for use in a python
project...


From lists at cheimes.de  Wed May 20 10:29:49 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 20 May 2009 16:29:49 +0200
Subject: 2d barcode library?
In-Reply-To: <0d33db03-cc89-4057-bbc6-5a76dd4b8045@s20g2000vbp.googlegroups.com>
References: <0d33db03-cc89-4057-bbc6-5a76dd4b8045@s20g2000vbp.googlegroups.com>
Message-ID: <gv144t$5gs$1@ger.gmane.org>

Trevor schrieb:
> Is anyone aware of a good library for building 2d barcodes (any format
> will work for me) and outputing them as some picture format,
> presumably png or bmp to be used for html printing? For 1D barcodes a
> simple barcode font will suffice, but obviously 2D is not so simple
> and i have yet to find the appropriate tool for use in a python
> project...

huBarcode [1[ works well for me. It supports qrcode and datamatrix 2d
barcodes. I was able to scan the generated barcodes with my mobile
phone, even from my LCD screen.

Christian

[1] https://cybernetics.hudora.biz/projects/wiki/huBarcode



From deets at nospam.web.de  Wed May 20 10:41:40 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 20 May 2009 16:41:40 +0200
Subject: P2P text chat engine
References: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>
	<76gn8qF1cliefU1@mid.uni-berlin.de>
	<56382643-36d9-436a-9e55-739e82ade7ee@z5g2000vba.googlegroups.com>
Message-ID: <77ij0vF1fckbfU1@mid.uni-berlin.de>

Kirill wrote:

> On 7 ???, 21:23, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>> Navanjo schrieb:
>>
>> > If you have the source code of a p2p text chat engine please send to me
>>
>> I found that & a pot of gold under my bed. Care to give me your address
>> so that I can send it to you?
>>
>> SCNR,
>> Diez
> 
> Hello, can you sent it to me ?
> avekir at gmail.com
> Many thanks!!!

I need a snail-mail address of course, gold isn't really shippable via
email, you know?

Diez


From paul at boddie.org.uk  Wed May 20 10:47:12 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Wed, 20 May 2009 07:47:12 -0700 (PDT)
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
	<4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>
	<3b84542c-7746-498d-8d9e-977deaecfc1d@r3g2000vbp.googlegroups.com>
	<77g46cF1h8ffnU1@mid.uni-berlin.de>
	<954320a5-10ef-41f3-8a08-c1163be19206@e23g2000vbe.googlegroups.com>
	<77i0gcF1etbmmU1@mid.uni-berlin.de>
Message-ID: <a2b16ce8-4a03-4bf0-947c-bb957a46b013@n8g2000vbb.googlegroups.com>

On 20 Mai, 11:25, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> Also, not trying to convince people that there are better alternatives to
> what and how they do something (admittedly, better is subjective, thus
> ensues discussion), or gathering arguments on why they do believe their way
> is preferable is the very essence of fora like this - if you'd really want
> that to go away, we're down to answering the notorious
> mutable-default-argument-question.

Yes, but the inquirer wasn't asking for general advice on what to use.
Again, if you're intending to use (or are constrained to using) one
thing, having people tell you to use something else has limited
benefits. I don't necessarily agree with the statements about the DOM
being particularly well thought out, but those were made to the
already-issued tangential advice which seems to be the norm on python-
list/comp.lang.python.

It's nice to see that one person responded to the inquirer's original
message, anyway, rather than attempt to "educate" him under the
assumption that he doesn't at all know what he's doing. In Google
Groups, you can see the "profile" of people and work out what they
seem to know fairly easily - a useful tool for anyone who doesn't
remember who asked what. Maybe some liberal usage of tools like that
would have saved us eight or so messages in this thread already.

Paul


From steko at iosa.it  Wed May 20 11:14:44 2009
From: steko at iosa.it (Stefano Costa)
Date: Wed, 20 May 2009 15:14:44 +0000 (UTC)
Subject: package with executable
References: <1242759252.4438.114.camel@gibreel>
	<200905200701.39370.a.cavallo@cavallinux.eu>
Message-ID: <pan.2009.05.20.15.15.55@iosa.it>

Il Wed, 20 May 2009 07:01:39 +0100, A. Cavallo ha scritto:

> With the standard distutils (no need for setuptools) the config.py file
> might look like:

Right, I ended up using setuptools just because I used paster to create 
the project layout. I'll think about using plain distutils instead.

> import gnucal must work. If you're developing from the sources (eg.
> without having the package installed) you need to be in the same dir
> where the gnucal.py is or you need to set PYTHONPATH in order to find
> the directory gnucal (the one containing __init__.py).

Right now, the problem is that upon installing "import gnucal" works in 
the python interactive interpreter, but gnucal.py raises an exception 
that it's not able to import gnucal.core and friends.

> At line 101 the statement sys.exit("Please.. should be
> parser.error("Please..

Good point! Thanks,
steko



From varguna at gmail.com  Wed May 20 11:17:50 2009
From: varguna at gmail.com (Aytekin Vargun)
Date: Wed, 20 May 2009 11:17:50 -0400
Subject: popen - reading strings - constructing a list from the strings
Message-ID: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>

 <python-list at python.org>
Hello everybody,
I have a question about the way I use os.popen. I am open to other
alternative suggestions like using subprocess or communicate.

I have an executable (say read_cell_types.exe) that produces string outputs.
For example, after one execution I got the following outputs in one line:

Neurons Microglia Astrocytes

In another execution, there might be different numbers of strings.

What I would like to do is to get these strings after running
read_cell_types.exe from my python program dynamically  and construct radio
buttons from the list of strings. In order to do this I need to construct a
list of strings first as in

["Neurons" "Microglia" "Astrocytes"]

Then it is easy to construct the radio buttons.

When I use the following code

command = "read_cell_types " + fileName2
child = os.popen(command)
data = child.read()
allObjects=data

allObjects (or data) contains the letters of all string words. I think it is
probably like ["N" "e" "u" "r"  ...]

How can I construct ["Neurons" "Microglia" "Astrocytes"] instead?

I will really appreciate your help.
Thanks a lot.

PS: fileName2 is a parameter  that I am passing to read_cell_types.exe

Aytekin

-- 
My web page: http://www.cs.rpi.edu/~vargua
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From paul at boddie.org.uk  Wed May 20 11:25:15 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Wed, 20 May 2009 08:25:15 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
	<b11fc5da-fc34-4638-a3c8-dbb53048d386@t10g2000vbg.googlegroups.com>
Message-ID: <cb381837-e878-47d1-88cd-8bd8069f0717@z5g2000vba.googlegroups.com>

On 20 Mai, 15:01, Iain King <iaink... at gmail.com> wrote:
>
> I was going to write something like this, but you've beat me to it :)
> Slightly different though; rather than have pmap collate everything
> together then return it, have it yield results as and when it gets
> them and stop iteration when it's done, and rename it to par to keep
> the OP happy and you should get something like what he initially
> requests (I think):
>
> total = 0
> for score in par(f, data):
> ? ? total += score

It depends on whether you want the outputs to correspond to the inputs
in the resulting sequence. If pmap is supposed to behave like map, you
want the positions of each input and corresponding output to match. As
I wrote earlier, in pprocess you distinguish between these cases by
employing maps (for input/output correspondence) and queues (for
"first ready" behaviour).

I don't recall whether the Map class in pprocess blocks for all the
data to be returned, or whether you can consume any outputs that are
at the start of the output sequence (and then block until output
arrives at the next available position), but this would be a logical
enhancement.

Paul


From google at mrabarnett.plus.com  Wed May 20 11:35:40 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 20 May 2009 16:35:40 +0100
Subject: popen - reading strings - constructing a list from the strings
In-Reply-To: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>
References: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>
Message-ID: <4A14234C.3090404@mrabarnett.plus.com>

Aytekin Vargun wrote:
> <mailto:python-list at python.org>
> Hello everybody,
> I have a question about the way I use os.popen. I am open to other 
> alternative suggestions like using subprocess or communicate.
> 
> I have an executable (say read_cell_types.exe) that produces string 
> outputs. For example, after one execution I got the following outputs in 
> one line:
> 
> Neurons Microglia Astrocytes
> 
> In another execution, there might be different numbers of strings.
> 
> What I would like to do is to get these strings after running 
> read_cell_types.exe from my python program dynamically  and construct 
> radio buttons from the list of strings. In order to do this I need to 
> construct a list of strings first as in
> 
> ["Neurons" "Microglia" "Astrocytes"]
> 
> Then it is easy to construct the radio buttons.
> 
> When I use the following code
> 
> command = "read_cell_types " + fileName2           
> child = os.popen(command)
> data = child.read()
> allObjects=data
> 
> allObjects (or data) contains the letters of all string words. I think 
> it is probably like ["N" "e" "u" "r"  ...]
> 
> How can I construct ["Neurons" "Microglia" "Astrocytes"] instead?
> 
> I will really appreciate your help.
> Thanks a lot.
> 
> PS: fileName2 is a parameter  that I am passing to read_cell_types.exe
> 
If the words in the string are separated by whitespace then use
allObjects.split().


From skip at pobox.com  Wed May 20 11:37:27 2009
From: skip at pobox.com (skip at pobox.com)
Date: Wed, 20 May 2009 10:37:27 -0500
Subject: How do I make pprint do this
In-Reply-To: <ecb09aa3-abb6-4bc1-9f54-0d312e542266@f16g2000vbf.googlegroups.com>
References: <ecb09aa3-abb6-4bc1-9f54-0d312e542266@f16g2000vbf.googlegroups.com>
Message-ID: <18964.9143.736748.614038@montanaro.dyndns.org>

    >> I cannot get pprint to format output how I would like. pydb does. I
    >> tried grepping the source but still couldn't grok it.

That's not the way pprint works.  You have no control over how it arranges
its output.  If you need something more flexible you'll have to roll your
own.

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/
    America's vaunted "free press" notwithstanding, story ideas that expose
    the unseemly side of actual or potential advertisers tend to fall by the
    wayside.  Not quite sure why.  -- Jim Thornton


From walterbyrd at iname.com  Wed May 20 11:52:56 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Wed, 20 May 2009 08:52:56 -0700 (PDT)
Subject: Trying to understand a very simple class - from the book "dive into 
	python"
Message-ID: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>

Example?5.6.?Coding the FileInfo Class
class FileInfo(UserDict):
    "store file metadata"
    def __init__(self, filename=None):
        UserDict.__init__(self)        (1)
        self["name"] = filename        (2)


What I do not understand is the last line. I thought 'self' was
supposed to refer to an instance of the object. But the square
brackets seem to indicate a list. Except you can not assign values to
a list like that. So where does "name" come from?

I am sure this is totally simple, but I missing something.


From conra2004 at yahoo.com  Wed May 20 11:55:25 2009
From: conra2004 at yahoo.com (yadin)
Date: Wed, 20 May 2009 08:55:25 -0700 (PDT)
Subject: finding repeated data sequences in a column
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>
	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>
Message-ID: <ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>

On May 20, 11:16?am, bearophileH... at lycos.com wrote:
> yadin, understanding what you want is probably 10 times harder than
> writing down the code :-)
>
> > I have a a table, from where I can extract a column.
>
> You can extract it? Or do you want to extract it? Or do you want to
> process it? Etc.
>
> > I wanna go down trough that column made of numbers
> > examine undetermined chunks ofdataand see or detect if that sequence
> > of chunk
> > ofdatahas beenrepeatedbefore
>
> What do you mean by "undetermined"? What kind ofdata? Where is thisdata? How is this "chunk" shaped? Are you talking about a string?
>
> > and if it has beenrepeateddetect it by giving it a name in an
> > adjacent column.
>
> What kind of name? So you just need 2 names, like N and S for New and
> Seen?
> You can use a built-in setdatastructure to know if you have already
> seen somedata, while you scan the records.
>
> > Imagine someting like this but made of 1800 numbers...
>
> How are such 1800 disposed? Do you mean 1800 columns of 32 bit
> numbers?
>
> > how can I build up column 3(category)<
>
> What does A, B and C mean?
>
> Bye,
> bearophile

lets say you have this column of numbers

1000028706
1000028707
1000028708
100
12
1000028706
1000028707
1000028708
1000028709
1000028706
1000028707
1000028708
100
12
6

How can I build up a program that tells me that this sequence
1000028706
1000028707
1000028708
is repeated somewhere in the column, and how can i know where?

thank you very much!


From kyrie at uh.cu  Wed May 20 11:59:26 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 20 May 2009 11:59:26 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com>
	<a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com>
Message-ID: <200905201159.26609.kyrie@uh.cu>

On Monday 18 May 2009 10:31:06 pm Carl Banks wrote:
> Even if you decided to accept the penalty and add locking to
> refcounts, you still have to be prepared for context switching at any
> time when writing C code, which means in practice you have to lock any
> object that's being accessed--that's in addition to the refcount lock.

While I agree that the GIL greatly simplifies things for the interpreter, I 
don't understand this statement. In practice, you should lock all critical 
sections if you expect your code to be used in a multithreading environment. 
That can't be different from what Java, C# or any other languages do, 
including C++. Why is that so expensive in python extensions, that it is used 
as an argument against removing the GIL?

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From marco at sferacarta.com  Wed May 20 11:59:36 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Wed, 20 May 2009 17:59:36 +0200
Subject: Trying to understand a very simple class - from the book "dive
	into  python"
In-Reply-To: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
References: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
Message-ID: <LNVQl.21081$Ux.11632@tornado.fastwebnet.it>

walterbyrd wrote:

 > I am sure this is totally simple, but I missing something.

Do you know what a dictionary is?



From kdawg44 at gmail.com  Wed May 20 12:06:56 2009
From: kdawg44 at gmail.com (K-Dawg)
Date: Wed, 20 May 2009 12:06:56 -0400
Subject: URGENT! Changing IE PAC Settings with Python
Message-ID: <5caea3690905200906w1c11bb08yf6068ee831038287@mail.gmail.com>

Hello,

Thanks for any response.  I am in a crisis where one of our networking guys
moved where our PAC file is housed.  There was a group policy set in Active
Directory that set the PAC file location in Internet Explorer to the new
location.

However, we have 100 remote centers that have about 3 to 4 machines that are
not on AD (from before an AD migration).  These machines did not receive the
update.

Is there a way I can write a python script to run from my machine to jump
out to a list
--
Kevin Holleran
Master of Science, Computer Information Systems
Grand Valley State University
Master of Business Administration
Western Michigan University
Completion December 2009
CCNA, ISA, MCSA, MCDST, MCP

"We are what we repeatedly do. Excellence, then, is not an act, but a
habit." - Aristotle

"A man flattened by an opponent can get up again. A man flattened by
conformity stays down for good. " - Thomas J. Watson
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From walterbyrd at iname.com  Wed May 20 12:08:08 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Wed, 20 May 2009 09:08:08 -0700 (PDT)
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com> 
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com> 
	<873ab07jpx.fsf@benfinney.id.au>
Message-ID: <83650e78-b0e9-4dcb-a0ff-ec369794a1d8@b7g2000pre.googlegroups.com>

On May 19, 5:31?pm, Ben Finney <ben+pyt... at benfinney.id.au> wrote:

> That's just the same micro-goal re-stated. What is your larger problem
> of which this is a part? Perhaps a better approach can be suggested when
> that context is known.

I am processing a huge spreadsheet which I have converted to a csv
format. Each row will be a wiki page with several sub-headings. The
spreadsheet contains information about servers. Wiki sub-headings may
include: 'hardware', 'software', 'users', 'network swith settings'.
'Hardware' may include the spreadsheet columns: 'memory', 'cpu', and
so on. So the first six columns in the spreadsheet may go under
'hardware' the next six under 'software' and so on.

I have already created the wiki pages, using a method similar to what
I first posted. But, it seems like there should be a better way to to
do it. So, for future reference, I was just wondering.



From walterbyrd at iname.com  Wed May 20 12:10:51 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Wed, 20 May 2009 09:10:51 -0700 (PDT)
Subject: Trying to understand a very simple class - from the book "dive 
	into python"
References: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
	<LNVQl.21081$Ux.11632@tornado.fastwebnet.it>
Message-ID: <1960e2d0-4d7b-448a-b701-65f36117059b@d19g2000prh.googlegroups.com>

On May 20, 9:59?am, Marco Mariani <ma... at sferacarta.com> wrote:

> Do you know what a dictionary is?

Yes, but I thought  a dictionary used curly brackets. Is the object a
dictionary?


From deets at nospam.web.de  Wed May 20 12:18:05 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 20 May 2009 18:18:05 +0200
Subject: Trying to understand a very simple class - from the book "dive
	into python"
References: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
	<LNVQl.21081$Ux.11632@tornado.fastwebnet.it>
	<1960e2d0-4d7b-448a-b701-65f36117059b@d19g2000prh.googlegroups.com>
Message-ID: <77iolnF1evfleU1@mid.uni-berlin.de>

walterbyrd wrote:

> On May 20, 9:59?am, Marco Mariani <ma... at sferacarta.com> wrote:
> 
>> Do you know what a dictionary is?
> 
> Yes, but I thought  a dictionary used curly brackets. Is the object a
> dictionary?

foo = {"key" : "i'm the value of a dictionary"}
print foo["key"]

I suggest you read the tutorial:

http://docs.python.org/tutorial/datastructures.html#dictionaries

Diez


From robert.kern at gmail.com  Wed May 20 12:23:09 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 20 May 2009 11:23:09 -0500
Subject: How do I make pprint do this
In-Reply-To: <18964.9143.736748.614038@montanaro.dyndns.org>
References: <ecb09aa3-abb6-4bc1-9f54-0d312e542266@f16g2000vbf.googlegroups.com>
	<18964.9143.736748.614038@montanaro.dyndns.org>
Message-ID: <gv1apf$suh$1@ger.gmane.org>

On 2009-05-20 10:37, skip at pobox.com wrote:
>      >>  I cannot get pprint to format output how I would like. pydb does. I
>      >>  tried grepping the source but still couldn't grok it.
>
> That's not the way pprint works.  You have no control over how it arranges
> its output.  If you need something more flexible you'll have to roll your
> own.

Or use Armin Ronacher's excellent pretty.py:

   http://dev.pocoo.org/hg/sandbox/file/tip/pretty

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From python.list at tim.thechases.com  Wed May 20 12:25:45 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 20 May 2009 11:25:45 -0500
Subject: finding repeated data sequences in a column
In-Reply-To: <ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
Message-ID: <4A142F09.5010200@tim.thechases.com>

> lets say you have this column of numbers
> 
> 1000028706
> 1000028707
> 1000028708
> 100
> 12
> 1000028706
> 1000028707
> 1000028708
> 1000028709
> 1000028706
> 1000028707
> 1000028708
> 100
> 12
> 6
> 
> How can I build up a program that tells me that this sequence
> 1000028706
> 1000028707
> 1000028708
> is repeated somewhere in the column, and how can i know where?

In your example, would "100,12" also be output, or do you only 
care about the first find?  Do you have a minimum or maximum 
number of repeats you care about?  Is a repeated number a 
"sequence of length 1"?  Can it be capped to know that if you 
have more than N items in common, you don't have to compare more 
than N items from the entire pair of sequences?

-tkc





From norseman at hughes.net  Wed May 20 12:40:41 2009
From: norseman at hughes.net (norseman)
Date: Wed, 20 May 2009 09:40:41 -0700
Subject: popen - reading strings - constructing a list from the strings
In-Reply-To: <4A14234C.3090404@mrabarnett.plus.com>
References: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>
	<4A14234C.3090404@mrabarnett.plus.com>
Message-ID: <4A143289.2030506@hughes.net>

MRAB wrote:
> Aytekin Vargun wrote:
>> <mailto:python-list at python.org>
>> Hello everybody,
>> I have a question about the way I use os.popen. I am open to other 
>> alternative suggestions like using subprocess or communicate.
>>
>> I have an executable (say read_cell_types.exe) that produces string 
>> outputs. For example, after one execution I got the following outputs 
>> in one line:
>>
>> Neurons Microglia Astrocytes
>>
>> In another execution, there might be different numbers of strings.
>>
>> What I would like to do is to get these strings after running 
>> read_cell_types.exe from my python program dynamically  and construct 
>> radio buttons from the list of strings. In order to do this I need to 
>> construct a list of strings first as in
>>
>> ["Neurons" "Microglia" "Astrocytes"]
>>
>> Then it is easy to construct the radio buttons.
>>
>> When I use the following code
>>
>> command = "read_cell_types " + fileName2           child = 
>> os.popen(command)
>> data = child.read()
>> allObjects=data
>>
>> allObjects (or data) contains the letters of all string words. I think 
>> it is probably like ["N" "e" "u" "r"  ...]
>>
>> How can I construct ["Neurons" "Microglia" "Astrocytes"] instead?
>>
>> I will really appreciate your help.
>> Thanks a lot.
>>
>> PS: fileName2 is a parameter  that I am passing to read_cell_types.exe
>>
> If the words in the string are separated by whitespace then use
> allObjects.split().
=================================================
 From actual code:
Python 2.5.2 with Tkinker supplied with download
Linux Slackware 10.2
Same files tested with identical results on Windows XP Pro
   (the .bin was changed to use the .exe compile on Window$ :)


import os

Scenario 1
               required    optional     optional
               .exe file   token(s)     redirected output
xx= os.popen("shp2dxf.bin al963424.shp >al963424.dxf").readlines()

Then use the output file any way you want.
                ----------

Scenerio 2
xx= os.popen("shp2dxf.bin al963424.shp").readlines()

for i in xx:
   print "\t"+i[:-1]


change the print to the code to process your strings (0r don't and use
it to show progress and just add code to process your strings.)

                ----------

The processed strings can be formatted into a list like below.  The
code (left side) can be left blank and you can fill it in manually or
numbers can be used or whatever you like. In this example, the right
side is what I want to be on the button(s).
          ("string", "same_string") is OK too.

   AttTyp = [
     ("S", "Single Use"),
     ("I", "Intercropping"),
     ("D", "Double Cropping"),
     ("T", "Triple Cropping"),
     ("M", "Mixed Land Use"),
     ("-","---------------"),
     ("t", "Toggle Table Display"),
   ]


Next, this will read the above list and generate the actual buttons if
you are using Tkinter.

   AttB= []
   for mode, text in AttTyp:
     c= Radiobutton(frameAtt, text=text, indicatoron=0,
          variable=AttVal, value=mode, command=getAttTyp)
     AttB.append(c)
     c.pack()
   AttB[5].config(state = DISABLED)  #grays out button
   AttB[6].config(state = DISABLED)  #(state= NORMAL) returns to live


Using the append() allows button control from other parts of the
program. It is not required for the buttons to work, but good to have.
*variable* is what is passed to python. AttVal in the example.
Python reads it by using AttVal.get(). As in if AttVal.get() == ??..
or perhaps  local_var_in_function= AttVal.get().
If you reverse the variables mode and text in the 'for mode...' line
then you need to reverse the two strings on each line of the feed list.
(Or exchange their places in the assignment section :)

Using mode and text as the vars, text goes on the button for the human
to read and mode is the internal value to test to determine which
button got pressed. The names mode and text are arbitrary. Name them as
you wish but place each appropriately in the assignment section.


Happy coding.

Today is 20090520
Steve




From jyasskin at gmail.com  Wed May 20 12:40:42 2009
From: jyasskin at gmail.com (Jeffrey Yasskin)
Date: Wed, 20 May 2009 09:40:42 -0700
Subject: [unladen-swallow] PEP 384: Defining a Stable ABI
In-Reply-To: <4A107988.3020202@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>
Message-ID: <5d44f72f0905200940k4a40f638j5637a6b79d075b0@mail.gmail.com>

A couple thoughts:

I'm with the people who think the refcount should be accessed through
functions by apps that want ABI compatibility. In particular,
GIL-removal efforts are guaranteed to change how the refcount is
modified, but there's a good chance they wouldn't have to change the
API. (We have some ideas for how to maintain source compatibility in
the absence of a GIL:
http://code.google.com/p/unladen-swallow/wiki/ExtensionModules#Reference_Counting)
Over an 8-year lifetime for Python 3, Moore's law predicts that
desktop systems will have up to 64 cores, at which point even the
simplest GIL-removal strategy of making refcounts atomic will be a
win, despite the 2x performance loss for a single thread. I wouldn't
want an ABI to rule that out.

I do think the refcounting macros should remain present in the API
(not ABI) for apps that only need source compatibility and want the
extra speed.

I wonder if it makes sense to specify an API compatibility mode in
this PEP too.

"Py_LIMITED_API" may not be the right macro name?it didn't imply
anything about an ABI when I first saw it. Might it make sense to use
Py_ABI_COMPATIBILITY=### instead? (Where ### could be an ISO date like
20090520.) That would put "ABI" in the macro name and make it easier
to define new versions later if necessary. (New versions would help
people compile against a new version of Python and be confident they
had something that would run against old versions.) If we never define
a new version, defining it to a number instead of just anything
doesn't really hurt.

It's probably worth pointing out in the PEP that the fact that
PyVarObject.ob_size is part of the ABI means that PyObject cannot
change size, even by adding fields at the end.

Right now, the globals representing types are defined like
"PyAPI_DATA(PyTypeObject) PyList_Type;". To allow the core to use the
new type creation functions, it might be useful to make the ABI type
objects PyTypeObject* constants instead.

In general, this looks really good. Thanks!

Jeffrey

On Sun, May 17, 2009 at 1:54 PM, "Martin v. L?wis" <martin at v.loewis.de> wrote:
>
> Thomas Wouters reminded me of a long-standing idea; I finally
> found the time to write it down.
>
> Please comment!
>
> Regards,
> Martin
>
> PEP: 384
> Title: Defining a Stable ABI
> Version: $Revision: 72754 $
> Last-Modified: $Date: 2009-05-17 21:14:52 +0200 (So, 17. Mai 2009) $
> Author: Martin v. L?wis <martin at v.loewis.de>
> Status: Draft
> Type: Standards Track
> Content-Type: text/x-rst
> Created: 17-May-2009
> Python-Version: 3.2
> Post-History:
>
> Abstract
> ========
>
> Currently, each feature release introduces a new name for the
> Python DLL on Windows, and may cause incompatibilities for extension
> modules on Unix. This PEP proposes to define a stable set of API
> functions which are guaranteed to be available for the lifetime
> of Python 3, and which will also remain binary-compatible across
> versions. Extension modules and applications embedding Python
> can work with different feature releases as long as they restrict
> themselves to this stable ABI.
>
> Rationale
> =========
>
> The primary source of ABI incompatibility are changes to the lay-out
> of in-memory structures. For example, the way in which string interning
> works, or the data type used to represent the size of an object, have
> changed during the life of Python 2.x. As a consequence, extension
> modules making direct access to fields of strings, lists, or tuples,
> would break if their code is loaded into a newer version of the
> interpreter without recompilation: offsets of other fields may have
> changed, making the extension modules access the wrong data.
>
> In some cases, the incompatibilities only affect internal objects of
> the interpreter, such as frame or code objects. For example, the way
> line numbers are represented has changed in the 2.x lifetime, as has
> the way in which local variables are stored (due to the introduction
> of closures). Even though most applications probably never used these
> objects, changing them had required to change the PYTHON_API_VERSION.
>
> On Linux, changes to the ABI are often not much of a problem: the
> system will provide a default Python installation, and many extension
> modules are already provided pre-compiled for that version. If additional
> modules are needed, or additional Python versions, users can typically
> compile them themselves on the system, resulting in modules that use
> the right ABI.
>
> On Windows, multiple simultaneous installations of different Python
> versions are common, and extension modules are compiled by their
> authors, not by end users. To reduce the risk of ABI incompatibilities,
> Python currently introduces a new DLL name pythonXY.dll for each
> feature release, whether or not ABI incompatibilities actually exist.
>
> With this PEP, it will be possible to reduce the dependency of binary
> extension modules on a specific Python feature release, and applications
> embedding Python can be made work with different releases.
>
> Specification
> =============
>
> The ABI specification falls into two parts: an API specification,
> specifying what function (groups) are available for use with the
> ABI, and a linkage specification specifying what libraries to link
> with. The actual ABI (layout of structures in memory, function
> calling conventions) is not specified, but implied by the
> compiler. As a recommendation, a specific ABI is recommended for
> selected platforms.
>
> During evolution of Python, new ABI functions will be added.
> Applications using them will then have a requirement on a minimum
> version of Python; this PEP provides no mechanism for such
> applications to fall back when the Python library is too old.
>
> Terminology
> -----------
>
> Applications and extension modules that want to use this ABI
> are collectively referred to as "applications" from here on.
>
> Header Files and Preprocessor Definitions
> -----------------------------------------
>
> Applications shall only include the header file Python.h (before
> including any system headers), or, optionally, include pyconfig.h, and
> then Python.h.
>
> During the compilation of applications, the preprocessor macro
> Py_LIMITED_API must be defined. Doing so will hide all definitions
> that are not part of the ABI.
>
> Structures
> ----------
>
> Only the following structures and structure fields are accessible to
> applications:
>
> - PyObject (ob_refcnt, ob_type)
> - PyVarObject (ob_base, ob_size)
> - Py_buffer (buf, obj, len, itemsize, readonly, ndim, shape,
> ?strides, suboffsets, smalltable, internal)
> - PyMethodDef (ml_name, ml_meth, ml_flags, ml_doc)
> - PyMemberDef (name, type, offset, flags, doc)
> - PyGetSetDef (name, get, set, doc, closure)
>
> The accessor macros to these fields (Py_REFCNT, Py_TYPE, Py_SIZE)
> are also available to applications.
>
> The following types are available, but opaque (i.e. incomplete):
>
> - PyThreadState
> - PyInterpreterState
>
> Type Objects
> ------------
>
> The structure of type objects is not available to applications;
> declaration of "static" type objects is not possible anymore
> (for applications using this ABI).
> Instead, type objects get created dynamically. To allow an
> easy creation of types (in particular, to be able to fill out
> function pointers easily), the following structures and functions
> are available::
>
> ?typedef struct{
> ? ?int slot; ? ?/* slot id, see below */
> ? ?void *pfunc; /* function pointer */
> ?} PyType_Slot;
>
> ?struct{
> ? ?const char* name;
> ? ?const char* doc;
> ? ?int basicsize;
> ? ?int itemsize;
> ? ?int flags;
> ? ?PyType_Slot *slots; /* terminated by slot==0. */
> ?} PyType_Spec;
>
> ?PyObject* PyType_FromSpec(PyType_Spec*);
>
> To specify a slot, a unique slot id must be provided. New Python
> versions may introduce new slot ids, but slot ids will never be
> recycled. Slots may get deprecated, but continue to be supported
> throughout Python 3.x.
>
> The slot ids are named like the field names of the structures that
> hold the pointers in Python 3.1, with an added ``Py_`` prefix (i.e.
> Py_tp_dealloc instead of just tp_dealloc):
>
> - tp_dealloc, tp_print, tp_getattr, tp_setattr, tp_repr,
> ?tp_hash, tp_call, tp_str, tp_getattro, tp_setattro,
> ?tp_doc, tp_traverse, tp_clear, tp_richcompare, tp_iter,
> ?tp_iternext, tp_methods, tp_base, tp_descr_set, tp_descr_set,
> ?tp_init, tp_alloc, tp_new, tp_is_gc, tp_bases, tp_del
> - nb_add nb_subtract nb_multiply nb_remainder nb_divmod nb_power
> ?nb_negative nb_positive nb_absolute nb_bool nb_invert nb_lshift
> ?nb_rshift nb_and nb_xor nb_or nb_int nb_float nb_inplace_add
> ?nb_inplace_subtract nb_inplace_multiply nb_inplace_remainder
> ?nb_inplace_power nb_inplace_lshift nb_inplace_rshift nb_inplace_and
> ?nb_inplace_xor nb_inplace_or nb_floor_divide nb_true_divide
> ?nb_inplace_floor_divide nb_inplace_true_divide nb_index
> - sq_length sq_concat sq_repeat sq_item sq_ass_item was_sq_ass_slice
> ?sq_contains sq_inplace_concat sq_inplace_repeat
> - mp_length mp_subscript mp_ass_subscript
> - bf_getbuffer bf_releasebuffer
>
> XXX Not supported yet: tp_weaklistoffset, tp_dictoffset
>
> The following fields cannot be set during type definition:
> - tp_dict tp_mro tp_cache tp_subclasses tp_weaklist
>
> Functions and function-like Macros
> ----------------------------------
>
> All functions starting with _Py are not available to applications.
> Also, all functions that expect parameter types that are unavailable
> to applications are excluded from the ABI, such as PyAST_FromNode
> (which expects a ``node*``).
>
> All other functions are available, unless excluded below.
>
> Function-like macros (in particular, field access macros) remain
> available to applications, but get replaced by function calls
> (unless their definition only refers to features of the ABI, such
> as the various _Check macros)
>
> ABI function declarations will not change their parameters or return
> types. If a change to the signature becomes necessary, a new function
> will be introduced. If the new function is source-compatible (e.g. if
> just the return type changes), an alias macro may get added to
> redirect calls to the new function when the applications is
> recompiled.
>
> If continued provision of the old function is not possible, it may get
> deprecated, then removed, in accordance with PEP 7, causing
> applications that use that function to break.
>
> Excluded Functions
> ------------------
>
> Functions declared in the following header files are not part
> of the ABI:
> - cellobject.h
> - classobject.h
> - code.h
> - frameobject.h
> - funcobject.h
> - genobject.h
> - pyarena.h
> - pydebug.h
> - symtable.h
> - token.h
> - traceback.h
>
> Global Variables
> ----------------
>
> Global variables representing types and exceptions are available
> to applications.
> XXX provide a complete list.
>
> XXX should restrict list of globals to truly "builtin" stuff,
> excluding everything that can also be looked up through imports.
>
> XXX may specify access to predefined types and exceptions through
> the interpreter state, with appropriate Get macros.
>
> Other Macros
> ------------
>
> All macros defining symbolic constants are available to applications;
> the numeric values will not change.
>
> In addition, the following macros are available:
>
> - Py_BEGIN_ALLOW_THREADS, Py_BLOCK_THREADS, Py_UNBLOCK_THREADS,
> ?Py_END_ALLOW_THREADS
>
> Linkage
> -------
>
> On Windows, applications shall link with python3.dll; an import
> library python3.lib will be available. This DLL will redirect all of
> its API functions through /export linker options to the full
> interpreter DLL, i.e. python3y.dll.
>
> XXX is it possible to redirect global variables in the same way?
> If not, python3.dll would have to copy them, and we should verify
> that all available global variables are read-only.
>
> On Unix systems, the ABI is typically provided by the python
> executable itself. PyModule_Create is changed to pass ``3`` as the API
> version if the extension module was compiled with Py_LIMITED_API; the
> version check for the API version will accept either 3 or the current
> PYTHON_API_VERSION as conforming. If Python is compiled as a shared
> library, it is installed as both libpython3.so, and libpython3.y.so;
> applications conforming to this PEP should then link to the former.
>
> XXX is it possible to make the soname libpython.so.3, and still
> have some applications link to libpython3.y.so?
>
> Implementation Strategy
> =======================
>
> This PEP will be implemented in a branch, allowing users to check
> whether their modules conform to the ABI. To simplify this testing, an
> additional macro Py_LIMITED_API_WITH_TYPES will expose the existing
> type object layout, to let users postpone rewriting all types. When
> the this branch is merged into the 3.2 code base, this macro will
> be removed.
>
> Copyright
> =========
>
> This document has been placed in the public domain.
>


From clp2 at rebertia.com  Wed May 20 12:48:43 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 20 May 2009 09:48:43 -0700
Subject: Trying to understand a very simple class - from the book "dive 
	into python"
In-Reply-To: <1960e2d0-4d7b-448a-b701-65f36117059b@d19g2000prh.googlegroups.com>
References: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
	<LNVQl.21081$Ux.11632@tornado.fastwebnet.it>
	<1960e2d0-4d7b-448a-b701-65f36117059b@d19g2000prh.googlegroups.com>
Message-ID: <50697b2c0905200948t113dbefeke24e4e9317f705fe@mail.gmail.com>

On Wed, May 20, 2009 at 9:10 AM, walterbyrd <walterbyrd at iname.com> wrote:
> On May 20, 9:59?am, Marco Mariani <ma... at sferacarta.com> wrote:
>
>> Do you know what a dictionary is?
>
> Yes, but I thought ?a dictionary used curly brackets. Is the object a
> dictionary?

Indeed. Note how you're subclassing `UserDict` (its name is similar to
`dict` for a reason).
See the UserDict docs for more info:
http://docs.python.org/library/userdict.html

Cheers,
Chris
-- 
http://blog.rebertia.com


From bearophileHUGS at lycos.com  Wed May 20 12:53:33 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Wed, 20 May 2009 09:53:33 -0700 (PDT)
Subject: finding repeated data sequences in a column
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>
	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com> 
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
Message-ID: <c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com>

yadin:
> How can I build up a program that tells me that this sequence
> 1000028706
> 1000028707
> 1000028708
> is repeated somewhere in the column, and how can i know where?

Can such patterns nest? That is, can you have a repeated pattern made
of an already seen pattern plus something else?
If you don't want a complex program, then you may need to specify the
problem better.

You may want something like LZ77 or releated (LZ78, etc):
http://en.wikipedia.org/wiki/LZ77
This may have a bug:
http://code.activestate.com/recipes/117226/

Bye,
bearophile


From jdoe at usenetlove.invalid  Wed May 20 13:05:28 2009
From: jdoe at usenetlove.invalid (John Doe)
Date: Wed, 20 May 2009 17:05:28 GMT
Subject: The ultimate in voice-powered scripting in Windows... need help
References: <gQgQl.29479$yr3.25296@nlpi068.nbdc.sbc.com>
Message-ID: <sLWQl.19701$8_3.12828@flpi147.ffdc.sbc.com>


The author provided solutions.
Posted to (comp.lang.beta).


From walterbyrd at iname.com  Wed May 20 13:38:18 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Wed, 20 May 2009 10:38:18 -0700 (PDT)
Subject: When does the escape character work within raw strings?
Message-ID: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>

I know that

s = r'x\nx'

means 'x' followed by a literal '\' followed by an 'n' (the '\n' is
not a carriage return).

s = r'x\tx'

means 'x' followed by a literal '\' followed by an 't' (the '\t' is
not a tab).

But, boundries seem to work differently.

s = re.sub(r'\bxxx\b', 'yyy', s)

Is *not* going to look for a literal '\' followed by 'b'

So I am confused about when escapes work within raw strings, and when
do escapes not work within raw strings.


From aaron.watters at gmail.com  Wed May 20 13:38:41 2009
From: aaron.watters at gmail.com (Aaron Watters)
Date: Wed, 20 May 2009 10:38:41 -0700 (PDT)
Subject: Ann: Nucular full text search 0.5 +boolean queries +unicode fixes
Message-ID: <9143fdf1-b0d0-457a-94fa-d27775f77612@n21g2000vba.googlegroups.com>

Announcing Nucular 0.5

This release adds streamlined interfaces for
boolean queries.  Search for "dogs" or "cats"
but not "smelly" like this:

  dicts = session.dictionaries("(dogs|cats) ~smelly")

Also included are some other features and bug
fixes, including some unicode handling bugfixes.

   HOME: http://nucular.sourceforge.net/
   BOOLEAN QUERIES: http://nucular.sourceforge.net/Boolean.html

About Nucular:

Nucular is a system for creating full text indices
for fielded data.  It can be accessed via a Python API
or via a suite of command line interfaces.

Nucular archives fielded documents and retrieves them
based on field value, field prefix, field word prefix,
or full text word prefix, word proximity or combinations of
these. Nucular also includes features for determining values
related to a query often called query facets.

Features

Nucular is very light weight. Updates and accesses
do not require any server process or other system
support such as shared memory locking.

Nucular supports concurrency. Arbitrary concurrent
updates and accesses by multiple processes or threads
are supported, with no possible locking issues.

Nucular is pure Python.
Nucular indexes and retrieves data quickly.
Nucular has a funny name.

More information about Nucular including links
to documentation, and releases is available at
http://nucular.sourceforge.net

Thanks: Rene Maurer and Matt Chaput and others
for comments, suggestions, patches.

   -- Aaron Watters

===
an apple every 8 hours
will keep 3 doctors away.  -- kliban


From egrefen at gmail.com  Wed May 20 13:43:21 2009
From: egrefen at gmail.com (Edward Grefenstette)
Date: Wed, 20 May 2009 10:43:21 -0700 (PDT)
Subject: LaTeXing python programs
Message-ID: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>

Yes, I am aware that this is more of a LaTeX question than a python
question, but I thought users here might be most likely to offer a
suitable recommendation.

I'm typing up my master's  thesis and will be including some of the
code used for my project in an appendix. The question is thus: is
there a LaTeX package out there that works well for presenting python
code?

verbatim is a bit ugly and doesn't wrap code, and while there are a
plethora of code colouring packages out there, they are not all easy
to use, so I thought I might ask what the popular options in the
community are.

Cheers,
Edward


From namekuseijin at gmail.com  Wed May 20 13:46:38 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Wed, 20 May 2009 14:46:38 -0300
Subject: Performance java vs. python
In-Reply-To: <de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.407.1242754952.8015.python-list@python.org>
	<guv968$2l5j$1@adenine.netfront.net>
	<de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>
Message-ID: <67d0527e0905201046m4a4de0b8u5cc8986affa5a3dd@mail.gmail.com>

On Tue, May 19, 2009 at 7:21 PM, David Stanek <dstanek at dstanek.com> wrote:
> On Tue, May 19, 2009 at 5:43 PM, namekuseijin <namekuseijin at gmail.com> wrote:
>> someone said:
>>>>>>
>>>>>> If you took a look at Java, you would
>>>>>> notice that the core language syntax is much simpler than Python's.
>>
>> thanks for the laughs whoever you are!
>>
>
> I'm no Java fan, but I do agree that the core language is a bit easier
> for people to grasp. I have also heard that from other developers as
> well.

Really?  Core language, eh?

Just take a look at just the summary of the Java language spec:
http://java.sun.com/docs/books/jls/third_edition/html/j3TOC.html

Then compare with the summary for Python 3.0 language reference:
http://docs.python.org/3.0/reference/

Like comparing a mammoth to a zebra.

Besides, how is:
for( int i=0; i<10; i++ )

simpler than:
for i in (range(10))

?

Scripting languages like Python eventually led Java to provide a more
friendly for, which they call, quite appropriately, enhacedFor.
Here's it in action:
for (Map.Entry<String, Integer> e : histogram.entrySet())

in Python:
for e in histogram.items()

fun.

Here's a more complete example, available a bit down from:
http://java.sun.com/docs/books/jls/third_edition/html/statements.html#14.14.2

Map<String, Integer> histogram = ...;
    double total = 0;
    for (int i : histogram.values())
        total += i;
    for (Map.Entry<String, Integer> e : histogram.entrySet())
        System.out.println(e.getKey() + "       " + e.getValue() / total);

in Python:
histogram = ...
total=0
for i in histogram.values():  total+=i
for e in histogram.items():
    print(  e[0] + "     " + str( e[1]/float(total) ))

yeah, surely a friggin' lot more complex... and we didn't even come to
use any of Java's HUUUGE APIs, just the core lang... BTW, I'm amused
that Java's string concatanating doesn't require an explicit cast from
the float result.

anyway, again, thanks for the laughs.


From varguna at gmail.com  Wed May 20 13:53:28 2009
From: varguna at gmail.com (Aytekin Vargun)
Date: Wed, 20 May 2009 13:53:28 -0400
Subject: popen - reading strings - constructing a list from the strings
In-Reply-To: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>
References: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>
Message-ID: <fe9846b90905201053l25fe0ebt47907de64a80eb88@mail.gmail.com>

First of all,
Thanks for the suggestions, MRAB and norseman. "split()" was what I was
looking for. Now I have a follow up question. In my application I create
radio buttons in a frame. These radio buttons are constructed whenever a
button is clicked. Therefore the list of items are dynamically changing.

What I want to do is to remove the current radio buttons and then recreate a
new set of radio buttons using a new string list. I could not see a command
for deleting or removing a set of radio buttons. I use Tkinter.

I can provide more details.
Thanks a lot.

PS: I apologize if this creates a new thread. I am new to the list.
Aytekin


On Wed, May 20, 2009 at 11:17 AM, Aytekin Vargun <varguna at gmail.com> wrote:

> <python-list at python.org>
> Hello everybody,
> I have a question about the way I use os.popen. I am open to other
> alternative suggestions like using subprocess or communicate.
>
> I have an executable (say read_cell_types.exe) that produces string
> outputs. For example, after one execution I got the following outputs in one
> line:
>
> Neurons Microglia Astrocytes
>
> In another execution, there might be different numbers of strings.
>
> What I would like to do is to get these strings after running
> read_cell_types.exe from my python program dynamically  and construct radio
> buttons from the list of strings. In order to do this I need to construct a
> list of strings first as in
>
> ["Neurons" "Microglia" "Astrocytes"]
>
> Then it is easy to construct the radio buttons.
>
> When I use the following code
>
> command = "read_cell_types " + fileName2
> child = os.popen(command)
> data = child.read()
> allObjects=data
>
> allObjects (or data) contains the letters of all string words. I think it
> is probably like ["N" "e" "u" "r"  ...]
>
> How can I construct ["Neurons" "Microglia" "Astrocytes"] instead?
>
> I will really appreciate your help.
> Thanks a lot.
>
> PS: fileName2 is a parameter  that I am passing to read_cell_types.exe
>
> Aytekin
>
> --
> My web page: http://www.cs.rpi.edu/~vargua<http://www.cs.rpi.edu/%7Evargua>
>



-- 
My web page: http://www.cs.rpi.edu/~vargua
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From norseman at hughes.net  Wed May 20 13:53:35 2009
From: norseman at hughes.net (norseman)
Date: Wed, 20 May 2009 10:53:35 -0700
Subject: finding repeated data sequences in a column
In-Reply-To: <c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com>
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
	<c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com>
Message-ID: <4A14439F.1070105@hughes.net>

bearophileHUGS at lycos.com wrote:
> yadin:
>> How can I build up a program that tells me that this sequence
>> 1000028706
>> 1000028707
>> 1000028708
>> is repeated somewhere in the column, and how can i know where?
> 
> Can such patterns nest? That is, can you have a repeated pattern made
> of an already seen pattern plus something else?
> If you don't want a complex program, then you may need to specify the
> problem better.
> 
> You may want something like LZ77 or releated (LZ78, etc):
> http://en.wikipedia.org/wiki/LZ77
> This may have a bug:
> http://code.activestate.com/recipes/117226/
> 
> Bye,
> bearophile
============================================
index on column
Ndx1 is set to index #1
Ndx2 is set to index #2
test Ndx1 against Ndx2
   if equal write line number and column content to a file
           (that's two things on one line:  15 1000028706
                                           283 1000028706 )
   Ndx1 is set to Ndx2
   Ndx2 is set to index #next
loop to test    writing out each duplicate set

Then use the outfile and index on line number

In similar manor, check if line current and next line line numbers are 
sequential.  If so scan forward to match column content of lower line 
number and check first matched column's line number and next for 
sequential.  Print them out if so


everything in outfile has 1 or more duplicates

4  aa               |--
5  bb         |--      |      thus 4/5 match 100/101
6  cc            |     |
.                |     |
100 aa           |  |--
101 bb         |--
102 ddd
103 cc                  there is a duplicate but not a sequence
200 ff

mark duplicate sequences as tested and proceed on through
   seq1 may have more than one other seq in file.
   the progress is from start to finish without looking back
   thus each step forward has fewer lines to test.
   marking already knowns eliminates redundant sequence testing.

By subseting on pass1 the expensive testing is greatly reduced.
If you know your subset data won't exceed memory then the "outfile"
can be held in memory to speed things up considerably.

Today is: 20090520
no code

Steve


From j.reid at mail.cryst.bbk.ac.uk  Wed May 20 13:55:18 2009
From: j.reid at mail.cryst.bbk.ac.uk (John Reid)
Date: Wed, 20 May 2009 18:55:18 +0100
Subject: LaTeXing python programs
In-Reply-To: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
Message-ID: <gv1g66$g7s$1@ger.gmane.org>

Edward Grefenstette wrote:
> I'm typing up my master's  thesis and will be including some of the
> code used for my project in an appendix. The question is thus: is
> there a LaTeX package out there that works well for presenting python
> code?
> 
> verbatim is a bit ugly and doesn't wrap code, and while there are a
> plethora of code colouring packages out there, they are not all easy
> to use, so I thought I might ask what the popular options in the
> community are.

pygments



From tim.arnold at sas.com  Wed May 20 13:57:03 2009
From: tim.arnold at sas.com (Tim Arnold)
Date: Wed, 20 May 2009 13:57:03 -0400
Subject: LaTeXing python programs
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
	<mailman.458.1242842132.8015.python-list@python.org>
Message-ID: <gv1g9f$fug$1@foggy.unx.sas.com>


"John Reid" <j.reid at mail.cryst.bbk.ac.uk> wrote in message 
news:mailman.458.1242842132.8015.python-list at python.org...
> Edward Grefenstette wrote:
>> I'm typing up my master's  thesis and will be including some of the
>> code used for my project in an appendix. The question is thus: is
>> there a LaTeX package out there that works well for presenting python
>> code?
>>
>> verbatim is a bit ugly and doesn't wrap code, and while there are a
>> plethora of code colouring packages out there, they are not all easy
>> to use, so I thought I might ask what the popular options in the
>> community are.
>
> pygments
>
and listings




From google at mrabarnett.plus.com  Wed May 20 14:05:10 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 20 May 2009 19:05:10 +0100
Subject: When does the escape character work within raw strings?
In-Reply-To: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
Message-ID: <4A144656.2040302@mrabarnett.plus.com>

walterbyrd wrote:
> I know that
> 
> s = r'x\nx'
> 
> means 'x' followed by a literal '\' followed by an 'n' (the '\n' is
> not a carriage return).
> 
> s = r'x\tx'
> 
> means 'x' followed by a literal '\' followed by an 't' (the '\t' is
> not a tab).
> 
> But, boundries seem to work differently.
> 
> s = re.sub(r'\bxxx\b', 'yyy', s)
> 
> Is *not* going to look for a literal '\' followed by 'b'
> 
> So I am confused about when escapes work within raw strings, and when
> do escapes not work within raw strings.
 >
The re module receives the regular expression in the form of a string
and then interprets it in its own way.

If you give the re module '\b', that's a backspace character, which is
treated as a literal character, just like 'x'.

If you give it r'\b', that _does_ contain 2 characters, but the re
module interprets it as representing a word boundary, except in a
character set [...] where that would be meaningless, so there it's
interpreted as representing a backspace character.


From jan.plaza at plattsburgh.edu  Wed May 20 14:35:47 2009
From: jan.plaza at plattsburgh.edu (Jan)
Date: Wed, 20 May 2009 11:35:47 -0700 (PDT)
Subject: reseting an iterator
Message-ID: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>

Wouldn't it be easy for Python to implement generating functions so
that the iterators they return are equipped with a __reset__() method?

Here is the context of this question.

Python documentation defines  a "iterator" as an object ITERATOR
having methods __next__() and __iter__() such that the call
ITERATOR.__iter__() returns the object itself, and once a call
ITERATOR. __next__() raises StopIteration every such subsequent call
does the same.

Python iterators model "generating Turing machines", i.e.
deterministic Turing machines which take no input, which have a
separation symbol # in the output alphabet; have an one-way-infinite
output tape on which the output head prints and moves only to the
right; The machine may have a halting state; a word is said to be
"generated by M" if it appears on the output tape delimited by
separation symbols # (independently of whether M halts or computes
infinitely). Generating Turing machines provide a characterization of
recursively enumerable languages: a language is generated by a
generating Turing machine iff it is accepted by a Turing machine.

Turing machines can take as input and run other Turing Machines --
similarly Python functions can take other functions (including
iterators) as parameters and call them. HOWEVER, this symmetry breaks
down: a Turing machine which takes a generating Turing machine M as
input can run M for a number of steps and then RESET M and run it
again, while iterators as currently defined in Python do not have a
reset method. (I realize that instead of reseting an old iterator, one
can make a new iterator but it is not as elegant.)

(Contrary to Python's philosophy that there should be one-- and
preferably only one --obvious way to do it) there are several ways to
define iterators:


From google at mrabarnett.plus.com  Wed May 20 14:39:35 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 20 May 2009 19:39:35 +0100
Subject: popen - reading strings - constructing a list from the strings
In-Reply-To: <fe9846b90905201053l25fe0ebt47907de64a80eb88@mail.gmail.com>
References: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>
	<fe9846b90905201053l25fe0ebt47907de64a80eb88@mail.gmail.com>
Message-ID: <4A144E67.3050003@mrabarnett.plus.com>

Aytekin Vargun wrote:
> First of all,
> Thanks for the suggestions, MRAB and norseman. "split()" was what I was 
> looking for. Now I have a follow up question. In my application I create 
> radio buttons in a frame. These radio buttons are constructed whenever a 
> button is clicked. Therefore the list of items are dynamically changing.
> 
> What I want to do is to remove the current radio buttons and then 
> recreate a new set of radio buttons using a new string list. I could not 
> see a command for deleting or removing a set of radio buttons. I use 
> Tkinter.
> 
> I can provide more details.
> Thanks a lot.
> 
> PS: I apologize if this creates a new thread. I am new to the list.
> Aytekin
> 
I have no idea whether this is possible. I'd just create a new frame. I
hope you're not trying to add and remove buttons on a dialog while it's
open; having a dialog radically change its appearance while the user is
watching would, IMHO, be very bad! :-)


From jaomatos at gmail.com  Wed May 20 14:40:20 2009
From: jaomatos at gmail.com (=?iso-8859-1?q?Jos=E9_Matos?=)
Date: Wed, 20 May 2009 19:40:20 +0100
Subject: LaTeXing python programs
In-Reply-To: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
Message-ID: <200905201940.20971.jaomatos@gmail.com>

On Wednesday 20 May 2009 18:43:21 Edward Grefenstette wrote:
> Yes, I am aware that this is more of a LaTeX question than a python
> question, but I thought users here might be most likely to offer a
> suitable recommendation.
>
> I'm typing up my master's  thesis and will be including some of the
> code used for my project in an appendix. The question is thus: is
> there a LaTeX package out there that works well for presenting python
> code?
>
> verbatim is a bit ugly and doesn't wrap code, and while there are a
> plethora of code colouring packages out there, they are not all easy
> to use, so I thought I might ask what the popular options in the
> community are.

Use the listings package.
It has a python as one of defined languages and has lots of other options.
http://www.ctan.org/tex-archive/macros/latex/contrib/listings/

> Cheers,
> Edward

-- 
Jos? Ab?lio


From jan.plaza at plattsburgh.edu  Wed May 20 14:48:07 2009
From: jan.plaza at plattsburgh.edu (Jan)
Date: Wed, 20 May 2009 11:48:07 -0700 (PDT)
Subject: reseting an iterator
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
Message-ID: <94951545-b334-443a-9f1e-a6822a27cc1f@21g2000vbk.googlegroups.com>

On May 20, 2:35?pm, Jan <jan.pl... at plattsburgh.edu> wrote:

OOPS, I have pressed some keys and the message went out before It was
finished.
Here is the last fragment:

So, one can define iterators by defining a class whose objects have
methods
__iter__ and __next__ -- with this approach it is easy to add some
__reset__
method. But the easiest way to define iterators is by constructing a
generating
function (with yield expressions); this function returns iterators,
although
without __reset__. Another way to define an iterator is to define
callable
and using iter(CALLABLE, SENTINEL) -- the resulting iterator will not
have __reset__.
I do not know how Python is implemented but I believe that
in the last two cases, Python could produce improved iterators with
__reset__
at almost no additional cost.

Jan


From aahz at pythoncraft.com  Wed May 20 14:52:43 2009
From: aahz at pythoncraft.com (Aahz)
Date: 20 May 2009 11:52:43 -0700
Subject: Import and absolute file names, sys.path including ''... or not
References: <mailman.406.1242754524.8015.python-list@python.org>
Message-ID: <gv1jhr$5q3$1@panix3.panix.com>

In article <mailman.406.1242754524.8015.python-list at python.org>,
Jean-Michel Pichavant  <jeanmichel at sequans.com> wrote:
>
>I spent quite a time on a malicious issue. I found out that there is a
>slight difference on the sys.path content when either executing code
>from a shell or from within a script.  This difference is the '' item,
>which is present in the shell form of sys.path.

Why are you calling this a malicious issue?

When I do this test, I find that the current working directory's full
path is prepended to sys.path, so if you're having problems, I bet that
you're changing your working directory during program execution.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From jan.plaza at plattsburgh.edu  Wed May 20 14:58:31 2009
From: jan.plaza at plattsburgh.edu (Jan)
Date: Wed, 20 May 2009 11:58:31 -0700 (PDT)
Subject: reseting an iterator
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
	<94951545-b334-443a-9f1e-a6822a27cc1f@21g2000vbk.googlegroups.com>
Message-ID: <16cfe1a7-9cb8-4ba1-9be1-30607c00f506@r34g2000vba.googlegroups.com>

On May 20, 2:48?pm, Jan <jan.pl... at plattsburgh.edu> wrote:

Iterators can also be produced by iter(ITERABLE) which
could mnufacture them with a __reset__.

Jan




From aisaac at american.edu  Wed May 20 15:20:20 2009
From: aisaac at american.edu (Alan G Isaac)
Date: Wed, 20 May 2009 15:20:20 -0400
Subject: 2d barcode library?
In-Reply-To: <mailman.444.1242829804.8015.python-list@python.org>
References: <0d33db03-cc89-4057-bbc6-5a76dd4b8045@s20g2000vbp.googlegroups.com>
	<mailman.444.1242829804.8015.python-list@python.org>
Message-ID: <i8udnb6VfdtuyonXnZ2dnUVZ_tBi4p2d@rcn.net>

Christian Heimes wrote:
> https://cybernetics.hudora.biz/projects/wiki/huBarcode


Cool.
I have to mention a pure PostScript writer as well:
http://www.terryburton.co.uk/barcodewriter/

Alan Isaac



From aisaac at american.edu  Wed May 20 15:23:39 2009
From: aisaac at american.edu (Alan G Isaac)
Date: Wed, 20 May 2009 15:23:39 -0400
Subject: LaTeXing python programs
In-Reply-To: <mailman.461.1242845176.8015.python-list@python.org>
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
	<mailman.461.1242845176.8015.python-list@python.org>
Message-ID: <i8udnbmVfdskxYnXnZ2dnUVZ_tBi4p2d@rcn.net>

> On Wednesday 20 May 2009 18:43:21 Edward Grefenstette 
> wrote:
>> is there a LaTeX package out there that works well for 
>> presenting python code? 


Jos? Matos wrote:
> Use the listings package. 
> It has a python as one of defined languages and has lots of other options. 
> http://www.ctan.org/tex-archive/macros/latex/contrib/listings/ 


The listings package is great and highly configurable.
Note that you can also input entire files of Python code
or pieces of them based on markers.  Really quite great.

Cheers,
Alan Isaac


From aisaac at american.edu  Wed May 20 15:29:01 2009
From: aisaac at american.edu (Alan G Isaac)
Date: Wed, 20 May 2009 15:29:01 -0400
Subject: reseting an iterator
In-Reply-To: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
Message-ID: <BbGdndsBGrZmxInXnZ2dnUVZ_gZi4p2d@rcn.net>

Jan wrote:
> Wouldn't it be easy for Python to implement generating functions so
> that the iterators they return are equipped with a __reset__() method?

Use ``send``:
http://docs.python.org/whatsnew/2.5.html#pep-342-new-generator-features

Remember, there may be no underlying sequence object for
an iterator, and if you want one in that case, you should build it.

Alan Isaac


From antroy at gmail.com  Wed May 20 15:40:19 2009
From: antroy at gmail.com (Ant)
Date: Wed, 20 May 2009 12:40:19 -0700 (PDT)
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com> 
	<mailman.407.1242754952.8015.python-list@python.org>
	<guv968$2l5j$1@adenine.netfront.net> 
	<de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com> 
	<mailman.455.1242841600.8015.python-list@python.org>
Message-ID: <0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>

On May 20, 6:46?pm, namekuseijin <namekusei... at gmail.com> wrote:
> anyway, again, thanks for the laughs.

I'm a Java developer in my day job, and I use Jython for testing out
ideas and prototyping, due to the way Jython makes writing Java so
much easier... Those examples were spot on - things weren't much
simpler before generics, as you had casting going on everywhere. Not
to mention the nice primitive / object divide to add to the languages
complexity.

And the libraries in Java... Compare cat implementations:

# Python
fh = open("myfile.txt")

for line in fh:
    print line

// Java

...

BufferedReader reader = new BufferedReader(new FileReader
("myfile.txt"));
String line = reader.readLine();
while (line != null) {
    System.out.println(line);
}

...

And that's without all of the class/main method boilerplate or try
catch block required due to checked exceptions.

I've taught both Java and Python, and the latter is far easier to pick
up and run with, from both a syntactic point of view and in the use of
the libraries.




From jeanmichel at sequans.com  Wed May 20 16:01:50 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 20 May 2009 22:01:50 +0200
Subject: Import and absolute file names, sys.path including ''... or not
In-Reply-To: <gv1jhr$5q3$1@panix3.panix.com>
References: <mailman.406.1242754524.8015.python-list@python.org>
	<gv1jhr$5q3$1@panix3.panix.com>
Message-ID: <4A1461AE.1030904@sequans.com>

You are right, but my concern is not the relative path resolution. Let 
me clarify:

/home/jeanmichel/test.py:
"import sys
print sys.path"

 >python.exe test.py
sys.path = ['/home/jeanmichel']
 > from within a python shell:
sys.path = ['']

The unpredictable effect of '' (at least something I did not predict) is 
that it allows absolute path resolution, while '/home/jeanmichel' cannot.
Example :
write a anotherTest.py file:
"
__import__('/home/jeanmichel/test')
"

anotherTest.py will be successfully imported in a python shell ('' + 
'/home/jeanmichel/test.py' is a valid path), but the "python.exe 
anotherTest2.py"  form will fail as it will try for '/home/jeanmichel' 
+'/home/jeanmichel/test.py' which is not a valid path.

So my question is: "why the shell is adding '' when the interpreter is 
adding the full path ?"

Hope I'm not too foggy.

JM

Aahz wrote:
> In article <mailman.406.1242754524.8015.python-list at python.org>,
> Jean-Michel Pichavant  <jeanmichel at sequans.com> wrote:
>   
>> I spent quite a time on a malicious issue. I found out that there is a
>> slight difference on the sys.path content when either executing code
>>     
> >from a shell or from within a script.  This difference is the '' item,
>   
>> which is present in the shell form of sys.path.
>>     
>
> Why are you calling this a malicious issue?
>
> When I do this test, I find that the current working directory's full
> path is prepended to sys.path, so if you're having problems, I bet that
> you're changing your working directory during program execution.
>   



From namekuseijin at gmail.com  Wed May 20 16:04:40 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Wed, 20 May 2009 17:04:40 -0300
Subject: Performance java vs. python
In-Reply-To: <0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.407.1242754952.8015.python-list@python.org>
	<guv968$2l5j$1@adenine.netfront.net>
	<de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>
	<mailman.455.1242841600.8015.python-list@python.org>
	<0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>
Message-ID: <gv1nor$10uu$1@adenine.netfront.net>

Ant escreveu:
> # Python
> fh = open("myfile.txt")
> 
> for line in fh:
>     print line
> 
> // Java
> 
> ...
> 
> BufferedReader reader = new BufferedReader(new FileReader
> ("myfile.txt"));
> String line = reader.readLine();
> while (line != null) {
>     System.out.println(line);
> }
> 
> ...
> 
> And that's without all of the class/main method boilerplate or try
> catch block required due to checked exceptions.

Indeed, and it's so complex and such a manual burden that you even 
forgot a further
line = reader.readLine();

inside your while block.

I find it completely unimaginable that people would even think 
suggesting the idea that Java is simpler.  It's one of the most stupidly 
verbose and cranky languages out there, to the point you can't really do 
anything of relevance without an IDE automatically pumping out lots of 
scaffold code for you.

-- 
a game sig: http://tinyurl.com/d3rxz9


From pavlovevidence at gmail.com  Wed May 20 16:32:59 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 20 May 2009 13:32:59 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com> 
	<a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com> 
	<mailman.449.1242835175.8015.python-list@python.org>
Message-ID: <01076ad2-705b-4aea-9867-d19d4adc6693@m17g2000vbi.googlegroups.com>

On May 20, 8:59?am, Luis Zarrabeitia <ky... at uh.cu> wrote:
> On Monday 18 May 2009 10:31:06 pm Carl Banks wrote:
>
> > Even if you decided to accept the penalty and add locking to
> > refcounts, you still have to be prepared for context switching at any
> > time when writing C code, which means in practice you have to lock any
> > object that's being accessed--that's in addition to the refcount lock.
>
> While I agree that the GIL greatly simplifies things for the interpreter, I
> don't understand this statement. In practice, you should lock all critical
> sections if you expect your code to be used in a multithreading environment.
> That can't be different from what Java, C# or any other languages do,
> including C++. Why is that so expensive in python extensions, that it is used
> as an argument against removing the GIL?

I wasn't really arguing that locking individual objects was a
significant penalty in computer time, only in programmer time.  The
locks on reference counts are what's expensive.

Also, I'm not using it as an argument against removing the GIL.  I
want to remove the GIL.  I'm only pointing out that removing the GIL
is not easy, and once it's removed there is a cost.


Carl Banks


From tjreedy at udel.edu  Wed May 20 16:45:59 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 20 May 2009 16:45:59 -0400
Subject: reseting an iterator
In-Reply-To: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
Message-ID: <gv1q69$muh$1@ger.gmane.org>

Jan wrote:
> Wouldn't it be easy for Python to implement generating functions so
> that the iterators they return are equipped with a __reset__() method?

No.  Such a method would have to poke around in the internals of the 
__next__ function in implementation specific ways.  The values used to 
initialize that function might have changed, so 'reset' would have to be 
carefully defined.

def squares():
   start = int(input("enter starting int:"))
   stop  = int(input("enter stopping int"))
   for i in range(start,stop):
     yield i*i

What does 'reset' mean here?

> Here is the context of this question.
> 
> Python documentation defines  a "iterator" as an object ITERATOR
> having methods __next__() and __iter__() such that the call
> ITERATOR.__iter__() returns the object itself, 

This is so that 'iter(iterator) is iterator', so that functions can take 
either an interable or iterator as an argument and proceed without 
checking which it got.

> and once a call ITERATOR. __next__() raises StopIteration every
 >  such subsequent call does the same.

After returning objects for some number of calls, which might be unbounded.

The protocol is basically one method with defined behavior.  It is 
intentionally minimal so it can be used as the universal within-Python 
object stream protocol.  Multiple ways of getting interators is in line 
with this purpose.

Terry Jan Reedy



From slbentley at gmail.com  Wed May 20 17:08:18 2009
From: slbentley at gmail.com (Scooter)
Date: Wed, 20 May 2009 14:08:18 -0700 (PDT)
Subject: Streaming pdf with URLLib
Message-ID: <04eacd56-5293-4553-bdb3-ad2e8266c6b0@z7g2000vbh.googlegroups.com>

I'm playing around with urllib, and httplib, trying to make something
of a pdf proxy.I have a pdf that lives on an internal web server, and
I would like to be able to stream it to my external server. (this is
just a test for a bigger process. Yes I could just copy the pdf to the
external box). I was playing with URLLib doing something like

#!/usr/bin/python

import urllib

u = urllib.urlopen('https://myinternal.server/pdfs/pdfstreamer.aspx')
print 'Content-type: application/pdf\n\n'
# print 'Content-type: application/x-msdownload; name=\"FileName\"\n
\n'
# print 'Content-Dispostion: attachment; filename=\"FileName\"\r\n\n'

pdfdoc = u.read()
print pdfdoc

Hitting my pdfstreamer.aspx app directly through a browser renders a
pdf just fine. So now I'm attempting to use this python app on an
external webserver, access it as a cgi, to pull the pdf, and then re-
render it, but at that point it just shows me the raw pdf in
the browser.


From j.reid at mail.cryst.bbk.ac.uk  Wed May 20 17:10:52 2009
From: j.reid at mail.cryst.bbk.ac.uk (John Reid)
Date: Wed, 20 May 2009 22:10:52 +0100
Subject: LaTeXing python programs
In-Reply-To: <i8udnbmVfdskxYnXnZ2dnUVZ_tBi4p2d@rcn.net>
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>	<mailman.461.1242845176.8015.python-list@python.org>
	<i8udnbmVfdskxYnXnZ2dnUVZ_tBi4p2d@rcn.net>
Message-ID: <gv1rks$shl$1@ger.gmane.org>


Alan G Isaac wrote:
> The listings package is great and highly configurable.
> Note that you can also input entire files of Python code
> or pieces of them based on markers.  Really quite great.

I tried listings. I believe pygments makes better formatted output (at 
least out of the box).



From mail at timgolden.me.uk  Wed May 20 17:11:58 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 20 May 2009 22:11:58 +0100
Subject: URGENT! Changing IE PAC Settings with Python
In-Reply-To: <5caea3690905200906w1c11bb08yf6068ee831038287@mail.gmail.com>
References: <5caea3690905200906w1c11bb08yf6068ee831038287@mail.gmail.com>
Message-ID: <4A14721E.3030007@timgolden.me.uk>

K-Dawg wrote:
> Thanks for any response.  I am in a crisis where one of our networking guys
> moved where our PAC file is housed.  There was a group policy set in Active
> Directory that set the PAC file location in Internet Explorer to the new
> location.
> 
> However, we have 100 remote centers that have about 3 to 4 machines that are
> not on AD (from before an AD migration).  These machines did not receive the
> update.
> 
> Is there a way I can write a python script to run from my machine to jump
> out to a list


More of a Windows question, really, and depends on the configuration
of network, security etc. Certainly you can use any of the usual
Windows techniques (UNCs, WMI, DCOM etc.) to invoke things on those remote
machines, assuming you have enough network and credentials to get there.

Not clear what your level of expertise is, either at the Windows
or at the Python level, so apols. if suggesting the obvious here.
If you already know what technique you're going to use to push
your file out (say, a copy to a remote unc) then getting Python to
read a list of machines from a file and doing the same to each one
is child's play:

import shutil
for machine in open ("machines.txt"):
  shutil.copyfile ("local.pac", r"\\%s\c$\somewhere\thing.pac" % machine)

If you need to set up credentials for that connection first, you
might want to use the win32net module from the pywin32 extensions
to establish a mapped drive or at least a NULL session with known
credentials.

As a possibility the other way round, if you're able to WMI into
the machines, you could run a command on them to pull the file
in, rather than pushing. Obviously, you've still got to establish
credentials.

I'll stop there, because I might be missing the target altogether.
You'll certainly get help here, but you might want to post to
the python-win32 list which is a bit more specialised.

TJG


From nytrokiss at gmail.com  Wed May 20 17:28:15 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Thu, 21 May 2009 00:28:15 +0300
Subject: URGENT! Changing IE PAC Settings with Python
In-Reply-To: <4A14721E.3030007@timgolden.me.uk>
References: <5caea3690905200906w1c11bb08yf6068ee831038287@mail.gmail.com>
	<4A14721E.3030007@timgolden.me.uk>
Message-ID: <8a6b8e350905201428i5a6e1887h68f11ff23dca4bb9@mail.gmail.com>

HI forwarded it to the Python Win32 list

On Thu, May 21, 2009 at 12:11 AM, Tim Golden <mail at timgolden.me.uk> wrote:

> K-Dawg wrote:
>
>> Thanks for any response.  I am in a crisis where one of our networking
>> guys
>> moved where our PAC file is housed.  There was a group policy set in
>> Active
>> Directory that set the PAC file location in Internet Explorer to the new
>> location.
>>
>> However, we have 100 remote centers that have about 3 to 4 machines that
>> are
>> not on AD (from before an AD migration).  These machines did not receive
>> the
>> update.
>>
>> Is there a way I can write a python script to run from my machine to jump
>> out to a list
>>
>
>
> More of a Windows question, really, and depends on the configuration
> of network, security etc. Certainly you can use any of the usual
> Windows techniques (UNCs, WMI, DCOM etc.) to invoke things on those remote
> machines, assuming you have enough network and credentials to get there.
>
> Not clear what your level of expertise is, either at the Windows
> or at the Python level, so apols. if suggesting the obvious here.
> If you already know what technique you're going to use to push
> your file out (say, a copy to a remote unc) then getting Python to
> read a list of machines from a file and doing the same to each one
> is child's play:
>
> import shutil
> for machine in open ("machines.txt"):
>  shutil.copyfile ("local.pac", r"\\%s\c$\somewhere\thing.pac" % machine)
>
> If you need to set up credentials for that connection first, you
> might want to use the win32net module from the pywin32 extensions
> to establish a mapped drive or at least a NULL session with known
> credentials.
>
> As a possibility the other way round, if you're able to WMI into
> the machines, you could run a command on them to pull the file
> in, rather than pushing. Obviously, you've still got to establish
> credentials.
>
> I'll stop there, because I might be missing the target altogether.
> You'll certainly get help here, but you might want to post to
> the python-win32 list which is a bit more specialised.
>
> TJG
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.goldwatches.com
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From kyrie at uh.cu  Wed May 20 17:38:51 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 20 May 2009 17:38:51 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <01076ad2-705b-4aea-9867-d19d4adc6693@m17g2000vbi.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<01076ad2-705b-4aea-9867-d19d4adc6693@m17g2000vbi.googlegroups.com>
Message-ID: <200905201738.51974.kyrie@uh.cu>

On Wednesday 20 May 2009 04:32:59 pm Carl Banks wrote:
> I wasn't really arguing that locking individual objects was a
> significant penalty in computer time, only in programmer time. ?The
> locks on reference counts are what's expensive.
>
> Also, I'm not using it as an argument against removing the GIL. ?I
> want to remove the GIL. ?I'm only pointing out that removing the GIL
> is not easy, and once it's removed there is a cost.

Ah, allright then. Thanks for the clarification.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From joseph.h.garvin at gmail.com  Wed May 20 17:50:32 2009
From: joseph.h.garvin at gmail.com (Joseph Garvin)
Date: Wed, 20 May 2009 16:50:32 -0500
Subject: optparse question, passing unknown flags to subprocess
Message-ID: <fea8ac9f0905201450y59118ee0i1d5e9063b0af18b8@mail.gmail.com>

I'm working on a python script that takes several command line flags,
currently parsed by hand. I'd like to change the script to parse them
with OptionParser from the optparse module. However, currently the
script invokes a subprocess, and any flags the script doesn't
understand it assumes are meant to be passed to the subprocess. But if
I switch to using OptionParser, any options I haven't added to my
parser will cause an error, instead of it ignoring those and letting
me pass them onto the subprocess.

What's the best/most-pythonic way to handle this? I could subclass
OptionParser and override its exit() and error() methods as suggested
by the docs (http://www.python.org/doc/2.4/lib/optparse-how-optik-handles-errors.html)
and have them do nothing, but there are some errors I probably don't
want to ignore (like if the user tries to pass a string to a known
flag that takes an int).


From adrian_d at eskimo.com  Wed May 20 17:53:39 2009
From: adrian_d at eskimo.com (Adrian Dragulescu)
Date: Wed, 20 May 2009 14:53:39 -0700 (PDT)
Subject: scoping problem with list comprehension // learning Python
Message-ID: <Pine.LNX.4.64.0905201433430.26139@shell.eskimo.com>


I just started to learn python (first posting to the list).

I have a list of dates as strings  that I want to convert to a 
list of datetime objects.  Here is my debugging session from inside a 
method.

(Pdb) formatIndex
'%Y-%m-%d'
(Pdb) [datetime.strptime(i, formatIndex) for i in self.index[0:3]]
*** NameError: global name 'formatIndex' is not defined
(Pdb) [datetime.strptime(i, '%Y-%m-%d') for i in self.index[0:3]]
[datetime.datetime(2007, 1, 3, 0, 0), datetime.datetime(2007, 1, 4, 0, 0), 
datetime.datetime(2007, 1, 5, 0, 0)]
(Pdb)

How come I get an error that formatIndex is not defined? I just show that 
it has value '%Y-%m-%d', in the same method scope.  Not sure why it says 
"global name", as I am in a method.

If I run it as a stand-alone, it works:
   index = ['2007-01-01', '2007-01-02', '2007-01-03']
   formatIndex = '%Y-%m-%d'
   print([datetime.strptime(i, formatIndex) for i in index])

Any suggestions much appreciated.  I'm sure it's something trivial.  I'm 
using Python30.

Adrian


From fetchinson at googlemail.com  Wed May 20 18:04:14 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Wed, 20 May 2009 15:04:14 -0700
Subject: P2P text chat engine
In-Reply-To: <77ij0vF1fckbfU1@mid.uni-berlin.de>
References: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>
	<76gn8qF1cliefU1@mid.uni-berlin.de>
	<56382643-36d9-436a-9e55-739e82ade7ee@z5g2000vba.googlegroups.com>
	<77ij0vF1fckbfU1@mid.uni-berlin.de>
Message-ID: <fbe2e2100905201504x16dbcbdeydf0a0eb5f7f6a1c@mail.gmail.com>

>>> > If you have the source code of a p2p text chat engine please send to me
>>>
>>> I found that & a pot of gold under my bed. Care to give me your address
>>> so that I can send it to you?
>>>
>>> SCNR,
>>> Diez
>>
>> Hello, can you sent it to me ?
>> avekir at gmail.com
>> Many thanks!!!
>
> I need a snail-mail address of course, gold isn't really shippable via
> email, you know?

In case the OP doesn't respond can I have the gold? Send certified mail to:

Santa Claus
North Pole

Cheers,
Santa

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From aahz at pythoncraft.com  Wed May 20 18:14:02 2009
From: aahz at pythoncraft.com (Aahz)
Date: 20 May 2009 15:14:02 -0700
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.455.1242841600.8015.python-list@python.org>
	<0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>
	<gv1nor$10uu$1@adenine.netfront.net>
Message-ID: <gv1vba$qfn$1@panix3.panix.com>

In article <gv1nor$10uu$1 at adenine.netfront.net>,
namekuseijin  <namekuseijin at gmail.com> wrote:
>
>I find it completely unimaginable that people would even think 
>suggesting the idea that Java is simpler.  It's one of the most stupidly 
>verbose and cranky languages out there, to the point you can't really do 
>anything of relevance without an IDE automatically pumping out lots of 
>scaffold code for you.

Well, I wouldn't go quite that far; after all, I managed to integrate
BouncyCastle into a Java app without an IDE (or really knowing Java, for
that matter).  But you have a valid point once the excessive generalizing
is removed.  ;-)
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From aahz at pythoncraft.com  Wed May 20 18:16:39 2009
From: aahz at pythoncraft.com (Aahz)
Date: 20 May 2009 15:16:39 -0700
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com>
	<a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
Message-ID: <gv1vg7$91r$1@panix3.panix.com>

In article <mailman.449.1242835175.8015.python-list at python.org>,
Luis Zarrabeitia  <kyrie at uh.cu> wrote:
>On Monday 18 May 2009 10:31:06 pm Carl Banks wrote:
>>
>> Even if you decided to accept the penalty and add locking to
>> refcounts, you still have to be prepared for context switching at any
>> time when writing C code, which means in practice you have to lock any
>> object that's being accessed--that's in addition to the refcount lock.
>
>While I agree that the GIL greatly simplifies things for the
>interpreter, I don't understand this statement. In practice, you should
>lock all critical sections if you expect your code to be used in a
>multithreading environment.  That can't be different from what Java, C#
>or any other languages do, including C++. Why is that so expensive in
>python extensions, that it is used as an argument against removing the
>GIL?

Python is intended to be simple/easy to integrate with random C
libraries.  Therefore you have to write explicit code from the C side in
order to drop the GIL.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From egrefen at gmail.com  Wed May 20 18:27:18 2009
From: egrefen at gmail.com (Edward Grefenstette)
Date: Wed, 20 May 2009 15:27:18 -0700 (PDT)
Subject: LaTeXing python programs
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
	<mailman.461.1242845176.8015.python-list@python.org>
	<i8udnbmVfdskxYnXnZ2dnUVZ_tBi4p2d@rcn.net> 
	<mailman.465.1242853870.8015.python-list@python.org>
Message-ID: <bdd7618d-53a4-48f8-bd0d-8a218d766c5a@n21g2000vba.googlegroups.com>

On May 20, 10:10?pm, John Reid <j.r... at mail.cryst.bbk.ac.uk> wrote:
> Alan G Isaac wrote:
> > The listings package is great and highly configurable.
> > Note that you can also input entire files of Python code
> > or pieces of them based on markers. ?Really quite great.
>
> I tried listings. I believe pygments makes better formatted output (at
> least out of the box).

I'm trying to figure out how to use pygments. Are there any good usage
examples out there?

Ed


From robert.kern at gmail.com  Wed May 20 18:31:47 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 20 May 2009 17:31:47 -0500
Subject: optparse question, passing unknown flags to subprocess
In-Reply-To: <fea8ac9f0905201450y59118ee0i1d5e9063b0af18b8@mail.gmail.com>
References: <fea8ac9f0905201450y59118ee0i1d5e9063b0af18b8@mail.gmail.com>
Message-ID: <gv20ck$eoi$1@ger.gmane.org>

On 2009-05-20 16:50, Joseph Garvin wrote:
> I'm working on a python script that takes several command line flags,
> currently parsed by hand. I'd like to change the script to parse them
> with OptionParser from the optparse module. However, currently the
> script invokes a subprocess, and any flags the script doesn't
> understand it assumes are meant to be passed to the subprocess. But if
> I switch to using OptionParser, any options I haven't added to my
> parser will cause an error, instead of it ignoring those and letting
> me pass them onto the subprocess.
>
> What's the best/most-pythonic way to handle this? I could subclass
> OptionParser and override its exit() and error() methods as suggested
> by the docs (http://www.python.org/doc/2.4/lib/optparse-how-optik-handles-errors.html)
> and have them do nothing, but there are some errors I probably don't
> want to ignore (like if the user tries to pass a string to a known
> flag that takes an int).

Does the user specify the subprocess's executable on the command line? E.g. I 
have a script called kernprof.py to run a Python script under the profiler:

   $ kernprof.py [--options-for-kernprof] ./some_script.py [--options-for-script]

I set

     parser.allow_interspersed_args = False

These means that once optparse hits any argument ("./some_script.py" in this 
case; basically, anything that is not an option), it will stop parsing options 
and just include everything else in the args list for you to do with as you please.

However, if you are wrapping a fixed executable and you want to allow the 
options to be all mixed up, I don't have a simple answer for you. You could use 
"--" when you run your script to separate the script's options from the 
arguments, but remembering to do that all of the time can be a pain.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Scott.Daniels at Acm.Org  Wed May 20 18:37:08 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 20 May 2009 15:37:08 -0700
Subject: PYTHONPATH on Windows XP module load problem
In-Reply-To: <gv0gca$tlf$00$1@news.t-online.com>
References: <guubg7$nnk$03$1@news.t-online.com>
	<mailman.390.1242742113.8015.python-list@python.org>
	<guuh3f$47k$00$1@news.t-online.com>
	<SbSdncYZUsrgT4_XnZ2dnUVZ_s2dnZ2d@pdx.net>
	<gv0gca$tlf$00$1@news.t-online.com>
Message-ID: <ybadndVhzcxaGYnXnZ2dnUVZ_t2dnZ2d@pdx.net>

Andreas Otto wrote:
> I have done additional research.
>      1. setup a "setup.py" script
>      2. compiled the extension
>      3. copy the extension to the test directory
>          -> cp ../pymsgque/build/lib.win32-3.0-pydebug/pymsgque.pyd .
This doesn't work.  Windows is beseiged by trojan writers.  Just as the
various shell authors on *ix stopped executing commands from files in
the current directory unless explicitly invoked via './ls' (for
example), on windows care is taken to avoid libraries from "the
current directory."  Normally one solves this with "python setup.py
install," but you could also do look at the places Python searches
for its loadable modules, and putting the copy in one of those places,
choosing (of course) one earlier in the search than the copy you
intend to override.

You want to keep your *ix model, and that just doesn't work (I take
as evidence your use of a "cp" command above).  I suggest you will
keep stubbing your toe on the next thing that doesn't work quite like
*ix.  To port software is not to simulate your favorite operating
system on the target architecture and then run your app there, but
to understand the target environment and work to fit the software
there.  If you aren't going to put in the time to learn that
target environment, just go with "distutils" model.  It will then
at least be easy to make installers for the target system.

So, for example, I build with mingw32, not the full-blown gcc
environment when working on Windows at home.  When at work, it is
my employer's choice what tools I use (Visual C/C++, Intel C/C++ on
Windows usually; more varied on *ix).

--Scott David Daniels
Scott.Daniels at Acm.Org


From kyrie at uh.cu  Wed May 20 19:07:58 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 20 May 2009 19:07:58 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <gv1vg7$91r$1@panix3.panix.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com>
Message-ID: <200905201907.58481.kyrie@uh.cu>

On Wednesday 20 May 2009 06:16:39 pm Aahz wrote:
> >While I agree that the GIL greatly simplifies things for the
> >interpreter, I don't understand this statement. In practice, you should
> >lock all critical sections if you expect your code to be used in a
> >multithreading environment. ?That can't be different from what Java, C#
> >or any other languages do, including C++. Why is that so expensive in
> >python extensions, that it is used as an argument against removing the
> >GIL?
>
> Python is intended to be simple/easy to integrate with random C
> libraries. ?Therefore you have to write explicit code from the C side in
> order to drop the GIL.

Erm, that doesn't really answers the question. If there were no GIL, the C 
code called from python would be just as unsafe as the C code called from C. 
And if "not thread-safe, you take care of the locking" notices are enough for 
the original libraries (and a lot of other languages, and even python 
constructs), the C extension could always grab the locks.

There must be another reason (i.e, the refcounts) to argue _for_ the GIL, 
because this one just seems to be just an attempt to fix unsafe code when 
called from python. And that was my point. Refcounts + interpreter simplicity 
seem to imply the need for a GIL, but to make unsafe code safe without fixing 
said code (or even thinking about it) is a weird goal... specially if it 
became the only reason for a GIL. After all, one could argue for that goal in 
almost all languages.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From seattlehanks at yahoo.com  Wed May 20 19:18:02 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Wed, 20 May 2009 16:18:02 -0700 (PDT)
Subject: from __future__ import absolute_import issue
Message-ID: <1aeb486c-eef8-453c-8d04-fd831a84f8e2@g22g2000pra.googlegroups.com>

New to the group, this is my first post...

It appears that either absolute imports (or my brain) aren't working.
Given a module string.py which is in the same directory as a.py:

#File a.py
from __future__ import absolute_import

import string

print string # Module imported is string.py in current directory, not
standard library module


It imports the string module in the current directory, not the stirng
module defined in the standard library.

I've also noticed (by printing sys.path) that the current directory
seems to always be included as the first element in sys.path, even
when absolute_import is used.

Any help appreciated.


From kw at codebykevin.com  Wed May 20 19:28:31 2009
From: kw at codebykevin.com (Kevin Walzer)
Date: Wed, 20 May 2009 19:28:31 -0400
Subject: IDLE doesn't save preferences
Message-ID: <affdf$4a149220$4275d90a$14761@FUSE.NET>

I'm using IDLE on Mac OS X 10.5.7 (Python 2.6.2) and I'm getting  a 
strange error when I try to save preferences from the configuration dialog:

Exception in Tkinter callback
Traceback (most recent call last):
   File 
"/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/lib-tk/Tkinter.py", 
line 1410, in __call__
return self.func(*args)
   File 
"/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/idlelib/configDialog.py", 
line 1146, in Apply
   self.DeactivateCurrentConfig()
File 
"/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/idlelib/configDialog.py", 
line 1124, in DeactivateCurrentConfig
     winInstances=self.parent.instance_dict.keys()
    File 
"/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/lib-tk/Tkinter.py", 
line 1722, in __getattr__
File 
"/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/lib-tk/Tkinter.py", 
line 1722, in __getattr__
    return getattr(self.tk, attr)
AttributeError: instance_dict

IDLE just hangs and won't save/update my preferences.

Any ideas?
-- 
Kevin Walzer
Code by Kevin
http://www.codebykevin.com


From seattlehanks at yahoo.com  Wed May 20 19:30:18 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Wed, 20 May 2009 16:30:18 -0700 (PDT)
Subject: from __future__ import absolute_import issue
References: <1aeb486c-eef8-453c-8d04-fd831a84f8e2@g22g2000pra.googlegroups.com>
Message-ID: <d425735e-dd9d-4631-b6d6-b00b867cfe4f@x1g2000prh.googlegroups.com>

On May 20, 4:18?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> New to the group, this is my first post...
>
> It appears that either absolute imports (or my brain) aren't working.
> Given a module string.py which is in the same directory as a.py:
>
> #File a.py
> from __future__ import absolute_import
>
> import string
>
> print string # Module imported is string.py in current directory, not
> standard library module
>
> It imports the string module in the current directory, not the stirng
> module defined in the standard library.
>
> I've also noticed (by printing sys.path) that the current directory
> seems to always be included as the first element in sys.path, even
> when absolute_import is used.
>
> Any help appreciated.

I think I figured this out. Just because a module is in a directory
with an __init__.py module it doesn't put it inside the package. For a
module to be in a package, it must be imported through the package. If
it is just executed as a top-level script, or imported (but not
through the package) the module is for all effects not in a package.


From fabiofz at gmail.com  Wed May 20 19:44:53 2009
From: fabiofz at gmail.com (Fabio Zadrozny)
Date: Wed, 20 May 2009 20:44:53 -0300
Subject: Pydev 1.4.6 Released
Message-ID: <cfb578b20905201644n56481c20p68e87cc198b6abd0@mail.gmail.com>

Hi All,

Pydev and Pydev Extensions 1.4.6 have been released

Details on Pydev Extensions: http://www.fabioz.com/pydev
Details on Pydev: http://pydev.sf.net
Details on its development: http://pydev.blogspot.com

Release Highlights in Pydev Extensions:
-----------------------------------------------------------------

* Auto-import for from __future__ import with_statement will add a
'with' token instead of a with_statement token
* Globals browser improved (only for Eclipse 3.3 onwards, older
versions will have the old interface):
      o Can filter with working sets
      o Can match based on module names. E.g.: django.A would match
all the django classes/methods/attributes starting with 'A'


Release Highlights in Pydev 1.4.6:
----------------------------------------------

* Google App Engine: customized setup and management of Google App
Engine projects
* String substitution variables can be used for pythonpath and launch config.
* The interpreter can be referred from a user-editable name
* Submodules shown on import completion (e.g.: from x|<-- request
completion here will show xml, xml.dom, xml.etree, etc)
* os.path added to default forced builtins
* Showing better errors when code-completion fails
* Fixed problem finding definition for java class when the constructor
was referenced.
* Fixed recursion error on Python 3.0 grammar
* Jython debugger - local variables are properly updated
* Multiple forced builtins can be added/removed at once
* Python 2.6 grammar: kwarg after unpacking arg list
* Python 3.0 grammar: star expr on for
* Fixed problem on code-completion when file is not in the workspace
(SystemASTManager cannot be cast to ASTManager)
* Not throwing IllegalCharsetNameEx on illegal encoding declaration
anymore (patch by Radim Kubacki)
* __future__ imports are always added/reorganized as the 1st import in
the module
* Code-completion in Jython recognizes that a method get/setName
should be available as a 'name' property.
* Finding 'objects' for django
* Pydev Package Explorer
      o Added filter for the python nodes
      o Showing configuration errors
      o Showing the interpreter info


What is PyDev?
---------------------------

PyDev is a plugin that enables users to use Eclipse for Python and
Jython development -- making Eclipse a first class Python IDE -- It
comes with many goodies such as code completion, syntax highlighting,
syntax analysis, refactor, debug and many others.


Cheers,

-- 
Fabio Zadrozny
------------------------------------------------------
Software Developer

Aptana
http://aptana.com/python

Pydev Extensions
http://www.fabioz.com/pydev

Pydev - Python Development Enviroment for Eclipse
http://pydev.sf.net
http://pydev.blogspot.com


From pyscripter at gmail.com  Wed May 20 20:07:53 2009
From: pyscripter at gmail.com (PyScripter)
Date: Wed, 20 May 2009 17:07:53 -0700 (PDT)
Subject: Python IDE PyScripter v1.9.9.7 released
Message-ID: <a7831516-2629-4a22-ad60-b6fab1e06326@21g2000vbk.googlegroups.com>

PyScripter version 1.9.9.7 has been released at http://pyscripter.googlecode.com.

PyScripter is a free and open-source Python Integrated Development
Environment (IDE) created with the ambition to become competitive in
functionality with commercial Windows-based IDEs available for other
languages. Being built in a compiled language is rather snappier than
some of the other Python IDEs and provides an extensive blend of
features that make it a productive Python development environment.

This release provides compatibility with Python 3.1.  Also in this
release PyScripter has been given a complete facelift based on an
updated theme engine which supports customizable themes (see
http://code.google.com/p/pyscripter/wiki/Customization).

As usual this release features an assortment of bug fixes and some
speed improvements.  The full history can be found at
http://code.google.com/p/pyscripter/wiki/History.


From mk.fraggod at gmail.com  Wed May 20 20:08:04 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Thu, 21 May 2009 06:08:04 +0600
Subject: Import and absolute file names, sys.path including ''... or not
In-Reply-To: <4A1461AE.1030904@sequans.com>
References: <mailman.406.1242754524.8015.python-list@python.org>
	<gv1jhr$5q3$1@panix3.panix.com> <4A1461AE.1030904@sequans.com>
Message-ID: <20090521060804.04370747@coercion>

On Wed, 20 May 2009 22:01:50 +0200
Jean-Michel Pichavant <jeanmichel at sequans.com> wrote:

> You are right, but my concern is not the relative path resolution. Let 
> me clarify:
> 
> /home/jeanmichel/test.py:
> "import sys
> print sys.path"
> 
>  >python.exe test.py
> sys.path = ['/home/jeanmichel']
>  > from within a python shell:
> sys.path = ['']
> 
> The unpredictable effect of '' (at least something I did not predict) is 
> that it allows absolute path resolution, while '/home/jeanmichel' cannot.
> Example :
> write a anotherTest.py file:
> "
> __import__('/home/jeanmichel/test')
> "

It works for me with py2.6, what version do you have?

> anotherTest.py will be successfully imported in a python shell ('' + 
> '/home/jeanmichel/test.py' is a valid path), but the "python.exe 
> anotherTest2.py"  form will fail as it will try for '/home/jeanmichel' 
> +'/home/jeanmichel/test.py' which is not a valid path.

I believe python uses os.path.join algorithm to combine paths which
discards anything (absolute or not) if absolute path gets appended to
it:
  os.path.join('/some/path', '/home/jeanmichel') == '/home/jeanmichel'

> So my question is: "why the shell is adding '' when the interpreter is 
> adding the full path ?"

Looks like a solid way to construct relative imports to me.

-- 
Mike Kazantsev // fraggod.net
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From steven at REMOVE.THIS.cybersource.com.au  Wed May 20 20:47:47 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 21 May 2009 00:47:47 GMT
Subject: reseting an iterator
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
Message-ID: <pan.2009.05.21.00.47.48@REMOVE.THIS.cybersource.com.au>

On Wed, 20 May 2009 11:35:47 -0700, Jan wrote:

> Wouldn't it be easy for Python to implement generating functions so that
> the iterators they return are equipped with a __reset__() method?

No.

def gen():
    for name in os.listdir('.'):
        yield open(name).read()
        os.remove(name)


How would you "easily" reset this generator so that it returns the same 
values each time?

That's an extreme example, but as a general rule, generators/iterators 
are one-shot: having consumed a value, you can't get it back again 
without re-creating it from scratch, or possibly not even then. Here's a 
less destructive example:

def gen():
    for i in xrange(10):
        yield time.time()



-- 
Steven


From benjamin at python.org  Wed May 20 20:52:57 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Thu, 21 May 2009 00:52:57 +0000 (UTC)
Subject: scoping problem with list comprehension // learning Python
References: <Pine.LNX.4.64.0905201433430.26139@shell.eskimo.com>
Message-ID: <loom.20090521T005056-67@post.gmane.org>

Adrian Dragulescu <adrian_d <at> eskimo.com> writes:

> 
> 
> I just started to learn python (first posting to the list).
> 
> I have a list of dates as strings  that I want to convert to a 
> list of datetime objects.  Here is my debugging session from inside a 
> method.
> 
> (Pdb) formatIndex
> '%Y-%m-%d'
> (Pdb) [datetime.strptime(i, formatIndex) for i in self.index[0:3]]
> *** NameError: global name 'formatIndex' is not defined
> (Pdb) [datetime.strptime(i, '%Y-%m-%d') for i in self.index[0:3]]
> [datetime.datetime(2007, 1, 3, 0, 0), datetime.datetime(2007, 1, 4, 0, 0), 
> datetime.datetime(2007, 1, 5, 0, 0)]
> (Pdb)
> 
> How come I get an error that formatIndex is not defined? I just show that 
> it has value '%Y-%m-%d', in the same method scope.  Not sure why it says 
> "global name", as I am in a method.

List comprehensions are implemented as nested functions. To be able to use
variables from the outer scope, the compiler has to "see" the list comp in the
context of the whole function. Thus, when you generate one dynamically (through
user input), the compiler doesn't correctly make a closure.






From kw at codebykevin.com  Wed May 20 20:56:23 2009
From: kw at codebykevin.com (Kevin Walzer)
Date: Wed, 20 May 2009 20:56:23 -0400
Subject: IDLE doesn't save preferences
In-Reply-To: <affdf$4a149220$4275d90a$14761@FUSE.NET>
References: <affdf$4a149220$4275d90a$14761@FUSE.NET>
Message-ID: <cee74$4a14a6b7$4275d90a$31817@FUSE.NET>

Kevin Walzer wrote:
> I'm using IDLE on Mac OS X 10.5.7 (Python 2.6.2) and I'm getting  a 
> strange error when I try to save preferences from the configuration dialog:
> 
> Exception in Tkinter callback
> Traceback (most recent call last):
>   File 
> "/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/lib-tk/Tkinter.py", 
> line 1410, in __call__
> return self.func(*args)
>   File 
> "/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/idlelib/configDialog.py", 
> line 1146, in Apply
>   self.DeactivateCurrentConfig()
> File 
> "/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/idlelib/configDialog.py", 
> line 1124, in DeactivateCurrentConfig
>     winInstances=self.parent.instance_dict.keys()
>    File 
> "/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/lib-tk/Tkinter.py", 
> line 1722, in __getattr__
> File 
> "/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/lib-tk/Tkinter.py", 
> line 1722, in __getattr__
>    return getattr(self.tk, attr)
> AttributeError: instance_dict
> 
> IDLE just hangs and won't save/update my preferences.
> 
> Any ideas?

Found a fix here:

http://bugs.python.org/issue5232

& uploaded patch here:

http://bugs.python.org/issue6075


-- 
Kevin Walzer
Code by Kevin
http://www.codebykevin.com


From belred at gmail.com  Wed May 20 21:14:03 2009
From: belred at gmail.com (belred)
Date: Wed, 20 May 2009 18:14:03 -0700 (PDT)
Subject: u'\N{dollar sign}'
Message-ID: <862195cd-8e90-4b0d-a944-05dc21858bab@b7g2000pre.googlegroups.com>

i can't for the life of me figure out where the unicode \N specifier
is located in the python documentation (2.6).  can anyone point me to
the page in the docs?

thanks,

bryan


From bluefisher80 at gmail.com  Wed May 20 21:21:35 2009
From: bluefisher80 at gmail.com (Jim Qiu)
Date: Thu, 21 May 2009 09:21:35 +0800
Subject: Yet another question about class property.
In-Reply-To: <4A13D4B4.3030809@ieee.org>
References: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>
	<4A13D4B4.3030809@ieee.org>
Message-ID: <b42c5a480905201821x22d815c1ic1f92631baded3c5@mail.gmail.com>

Thanks for you patience, Dave.
Obviously i have not got used to the python philosophy.

Following you guide, i implemented the following code, and you are
absolutely right.

#!/usr/bin/python
#coding:utf-8

class Parent(object):

def __init__(self):
pass

def displayAttrOfSubClass(self):
print self.attrFromChild

class Child(Parent):
def __init__(self):
self.attrFromChild = 'Hi, Everyone, Java does this support this trick!'


childObj = Child()
childObj.displayAttrOfSubClass()


Python can use in the parent class a variable only instantiated by a
sub-class, is this a point of advance of technique of Python?

Jim















On Wed, May 20, 2009 at 6:00 PM, Dave Angel <davea at ieee.org> wrote:

> Jim Qiu wrote:
>
>> Hi everyone,
>>
>> Following is the code i am reading, i don't see anywhere the declaration
>> of
>> Message.root object,
>> Where is it from?
>>
>> #bots-modules
>> import bots.botslib as botslib
>> import bots.node as node
>> from bots.botsconfig import *
>>
>>
>> class Message(object):
>>    ''' abstract class; represents a edi message.
>>        is subclassed as outmessage or inmessage object.
>>    '''
>>    def __init__(self):
>>        self.recordnumber=0                #segment counter. Is not used
>> for
>> UNT of SE record; some editypes want sequential recordnumbering
>>
>>    @staticmethod
>>    def display(records):
>>        '''for debugging lexed records.'''
>>        for record in records:
>>            t = 0
>>            for veld in record:
>>                if t==0:
>>                    print '%s    (Record-id)'%(veld[VALUE])
>>                else:
>>                    if veld[SFIELD]:
>>                        print '        %s    (sub)'%(veld[VALUE])
>>                    else:
>>                        print '    %s    (veld)'%(veld[VALUE])
>>                t += 1
>>
>>    def get(self,*mpaths):
>>        ''' query tree (self.root) with mpath; get value (string); get None
>> if not found.'''
>>        if self.root.record is None:
>>            raise botslib.MpathRootError('get("%s"): "root" of incoming
>> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>>        return self.root.get(*mpaths)
>>
>>    def getnozero(self,*mpaths):
>>        ''' like get, returns None is value is zero (0) or not numeric.
>>            Is sometimes usefull in mapping.'''
>>        if self.root.record is None:
>>            raise botslib.MpathRootError('get("%s"): "root" of incoming
>> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>>        return self.root.getnozero(*mpaths)
>>
>>    def getindicator(self,ind,*mpaths):
>>        ''' like get, returns None is value is zero (0) or not numeric.
>>            Is sometimes usefull in mapping.'''
>>        if self.root.record is None:
>>            raise botslib.MpathRootError('get("%s"): "root" of incoming
>> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>>        return self.root.getindicator(ind,*mpaths)
>>
>>    def getcount(self):
>>        ''' count number of nodes in self.root. Number of nodes is number
>> of
>> records.'''
>>        return self.root.getcount()
>>
>>    def getcountoccurrences(self,*mpaths):
>>        ''' count number of nodes in self.root. Number of nodes is number
>> of
>> records.'''
>>        count = 0
>>        for value in self.getloop(*mpaths):
>>            count += 1
>>        return count
>>
>>    def getcountsum(self,*mpaths):
>>        ''' return the sum for all values found in mpath. Eg total number
>> of
>> ordered quantities.'''
>>        if self.root.record is None:
>>            raise botslib.MpathRootError('get("%s"): "root" of incoming
>> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>>        return self.root.getcountsum(*mpaths)
>>
>>    def getloop(self,*mpaths):
>>        ''' query tree with mpath; generates all the nodes. Is typically
>> used as: for record in inn.get(mpath):
>>        '''
>>        if self.root.record:    #self.root is a real root
>>            for terug in self.root.getloop(*mpaths): #search recursive for
>> rest of mpaths
>>                yield terug
>>        else:   #self.root is dummy root
>>            for childnode in self.root.children:
>>                for terug in childnode.getloop(*mpaths): #search recursive
>> for rest of mpaths
>>                    yield terug
>>
>>    def put(self,*mpaths):
>>        if self.root.record is None and self.root.children:
>>            raise botslib.MpathRootError('put("%s"): "root" of outgoing
>> message is empty; use out.putloop'%(str(mpaths)))
>>        return self.root.put(*mpaths)
>>
>>    def putloop(self,*mpaths):
>>        if not self.root.record:    #no input yet, and start with a
>> putloop(): dummy root
>>            if len(mpaths) == 1:
>>                self.root.append(node.Node(mpaths[0]))
>>                return self.root.children[-1]
>>            else: #TODO: what if self.root.record is None and len(mpaths) >
>> 1?
>>                raise botslib.MpathRootError('putloop("%s"): mpath too
>> long???'%(str(mpaths)))
>>        return self.root.putloop(*mpaths)
>>
>>    def sort(self,*mpaths):
>>        if self.root.record is None:
>>            raise botslib.MpathRootError('get("%s"): "root" of message is
>> empty; either split messages or use inn.getloop'%(str(mpaths)))
>>        self.root.sort(*mpaths)
>>
>>    def normalisetree(self,node):
>>        ''' The node tree is check, sorted, fields are formated etc.
>>            Always use this method before writing output.
>>        '''
>>        #~ node.display()
>>        #~ print 'normalisetree'
>>        self._checktree(node,self.defmessage.structure[0])
>>        self._canonicaltree(node,self.defmessage.structure[0])
>>
>>    def _checktree(self,tree,structure):
>>        ''' checks tree with table:
>>            -   all records should be in table at the right place in
>> hierarchy
>>            -   for each record, all fields should be in grammar
>>            This function checks the root of grammar-structure with root of
>> node tree
>>        '''
>>        if tree.record['BOTSID'] == structure[ID]:
>>            #check tree recursively with structure
>>            self._checktreecore(tree,structure)
>>        else:
>>            raise botslib.MessageError('(Root)record %s of %s not in table
>> %s'%(tree.record['BOTSID'],tree.record,self.defmessage.grammarname))
>>
>>    def _checktreecore(self,node,structure):
>>        ''' recursive
>>        '''
>>        deletelist=[]
>>        self._checkfields(node.record,structure)
>>        if node.children and not LEVEL in structure:
>>            if self.ta_info['checkunknownentities']:
>>                raise botslib.MessageError('Record "%s" in message has
>> children, but structure of grammar "%s" not. Found gg
>>
>> "%s".'%(node.record['BOTSID'],self.defmessage.grammarname,node.children[0].record['BOTSID']))
>>            node.children=[]
>>            return
>>        for childnode in node.children:          #for every node:
>>            for structure_record in structure[LEVEL]:           #search in
>> grammar-records
>>                if childnode.record['BOTSID'] == structure_record[ID]:
>> #if
>> found right structure_record
>>                    #check children recursive
>>                    self._checktreecore(childnode,structure_record)
>>                    break    #check next mpathnode
>>            else:   #checked all structure_record in grammar, but nothing
>> found
>>                if self.ta_info['checkunknownentities']:
>>                    raise botslib.MessageError('Record "%s" in message not
>> in structure of grammar "%s". Whole record:
>>
>> "%s".'%(childnode.record['BOTSID'],self.defmessage.grammarname,childnode.record))
>>                deletelist.append(childnode)
>>        for child in deletelist:
>>            node.children.remove(child)
>>
>>
>>    def _checkfields(self,record,structure_record):
>>        ''' checks for every field in record if field exists in
>> structure_record (from grammar).
>>        '''
>>        deletelist=[]
>>        for field in record.keys():          #all fields in record should
>> exist in structure_record
>>            for grammarfield in structure_record[FIELDS]:
>>                if grammarfield[ISFIELD]:    #if field (no composite)
>>                    if field == grammarfield[ID]:
>>                        break
>>                else:   #if composite
>>                    for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
>> subfields
>>                        if field == grammarsubfield[ID]:
>>                            break
>>                    else:
>>                        continue
>>                    break
>>            else:
>>                if self.ta_info['checkunknownentities']:
>>                    raise botslib.MessageError('Field "%s" does not exist
>> in
>> record: %s'%(field,structure_record[MPATH]))
>>                    #~ raise botslib.MessageError('Field "%s" does not
>> exist
>> in record: %s'%(field,structure_record[ID]))       #alt voor MPATH
>>                    #~ raise botslib.MessageError('Field "%s" does not
>> exist
>> in record: %s'%(field,structure_record[FIELDS]))   #folder, text is too
>> long
>>                deletelist.append(field)
>>        for field in deletelist:
>>            del record[field]
>>
>>    def _canonicaltree(self,node,structure,headerrecordnumber=0):
>>        ''' For nodes: check min and max occurence; sort the nodes conform
>> grammar
>>            For fields: check M/C; format the fields.
>>        '''
>>        sortednodelist = []
>>        self._canonicalfields(node.record,structure,headerrecordnumber)
>>  #write the fields
>>        if LEVEL in structure:
>>            for structure_record in structure[LEVEL]:  #for
>> structure_record
>> of this level in grammar
>>                count = 0                           #count number of
>> occurences of record
>>                for childnode in node.children:            #for every node
>> in mpathtree; SPEED: delete nodes from list when found
>>                    if childnode.record['BOTSID'] != structure_record[ID]:
>> #if it is not the right NODE":
>>                        continue
>>                    count += 1
>>
>>  self._canonicaltree(childnode,structure_record,self.recordnumber)
>> #use rest of index in deeper level
>>                    sortednodelist.append(childnode)
>>                if structure_record[MIN] > count:
>>                    raise botslib.MessageError('Record "%s": mandatory but
>> not present.'%(structure_record[MPATH]))
>>                if structure_record[MAX] < count:
>>                    raise botslib.MessageError('Record "%s": occures to
>> often (%s times).'%(structure_record[MPATH],count))
>>            node.children=sortednodelist
>>            if hasattr(self,'do_queries'):
>>                self.do_queries(node,structure)
>>
>>    def
>> _canonicalfields(self,noderecord,structure_record,headerrecordnumber):
>>        ''' For fields: check M/C; format the fields. Field are not sorted
>> here (a dict can not be sorted)
>>        '''
>>        #~ print noderecord
>>        for grammarfield in structure_record[FIELDS]:
>>            if grammarfield[ISFIELD]:    #if field (no composite)
>>                value = noderecord.get(grammarfield[ID],'')
>>                #~ print 'check field',grammarfield,value
>>                if not value:
>>                    if grammarfield[MANDATORY] == 'M':
>>                        raise botslib.MessageError('Record "%s": mandatory
>> field "%s" not filled.'%(structure_record[MPATH],grammarfield[ID]))
>>                    elif not grammarfield[MINLENGTH]:   #if minlength=0
>>                        continue
>>                noderecord[grammarfield[ID]] =
>> self._formatfield(value,grammarfield,structure_record)
>>            else:               #if composite
>>                compositefilled = False
>>                for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
>> subfields to see if one of them is there
>>                    if noderecord.get(grammarsubfield[ID],''):
>>                        compositefilled = True
>>                if not compositefilled:
>>                    if grammarfield[MANDATORY]=='M':
>>                        raise botslib.MessageError('Record "%s": mandatory
>> composite "%s" not filled.'%(structure_record[MPATH],grammarfield[ID]))
>>                    continue
>>                for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
>> subfields
>>                    value = noderecord.get(grammarsubfield[ID],'')
>>                    #~ print 'check subfield',grammarsubfield,value
>>                    if not value:
>>                        if grammarsubfield[MANDATORY]=='M':
>>                            #~ print 'Record "%s": mandatory subfield "%s"
>> not filled:
>> "%s".'%(structure_record[MPATH],grammarsubfield[ID],noderecord)
>>                            raise botslib.MessageError('Record "%s":
>> mandatory subfield "%s" not filled:
>> "%s".'%(structure_record[MPATH],grammarsubfield[ID],noderecord))
>>                        else:
>>                            continue
>>                    noderecord[grammarsubfield[ID]] =
>> self._formatfield(value,grammarsubfield,structure_record)
>>                    #~ print 'fill',grammarfield[ID]
>>
>> Thanks in advance.
>>
>> Jim
>>
>>
>>
> Unlike your previous question, this attribute is not referenced in
> __init__().  That, plus the comment about being an abstract class, leads me
> to guess that the derived classes are required to define this attribute.
>  That's one of the characteristics of an abstract class;  some of the
> details are missing, and intended to be supplied by a child class.
>
> What do the docs for this abstract class say?  If they don't discuss how to
> implement a concrete class, they're sadly lacking.
>
>
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From pavlovevidence at gmail.com  Wed May 20 21:26:20 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 20 May 2009 18:26:20 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com> 
	<mailman.472.1242860891.8015.python-list@python.org>
Message-ID: <a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>

On May 20, 4:07?pm, Luis Zarrabeitia <ky... at uh.cu> wrote:
> On Wednesday 20 May 2009 06:16:39 pm Aahz wrote:
>
> > >While I agree that the GIL greatly simplifies things for the
> > >interpreter, I don't understand this statement. In practice, you should
> > >lock all critical sections if you expect your code to be used in a
> > >multithreading environment. ?That can't be different from what Java, C#
> > >or any other languages do, including C++. Why is that so expensive in
> > >python extensions, that it is used as an argument against removing the
> > >GIL?
>
> > Python is intended to be simple/easy to integrate with random C
> > libraries. ?Therefore you have to write explicit code from the C side in
> > order to drop the GIL.
>
> Erm, that doesn't really answers the question. If there were no GIL, the C
> code called from python would be just as unsafe as the C code called from C.
> And if "not thread-safe, you take care of the locking" notices are enough for
> the original libraries (and a lot of other languages, and even python
> constructs), the C extension could always grab the locks.

The designers of Python made a design decision(**) that extension
writers would not have to take care of locking.  They could have made
a different decision, they just didn't.


> There must be another reason (i.e, the refcounts) to argue _for_ the GIL,

Why?


> because this one just seems to be just an attempt to fix unsafe code when
> called from python.

I think you are being unfair in calling it unsafe.

Suppose if I were to call PyList_Append from a C extension.  It's not
necessary for me to guard the list I'm calling it on with a lock,
because only the GIL thread is allowed to call most Python API or
otherwise access objects.  But you seem to be suggesting that since I
didn't guard the list with a lock it is "unsafe", even though the GIL
is sufficient?

No, I totally disagree.  The code is not "unsafe" and the GIL doesn't
"fix" it.  The code is jsut


> And that was my point. Refcounts + interpreter simplicity
> seem to imply the need for a GIL, but to make unsafe code safe without fixing
> said code (or even thinking about it) is a weird goal...

Why?  Do you seriously not see the benefit of simplifying the work of
extention writers and core maintainers?  You don't have to agree that
it's a good trade-off but it's a perfectly reasonable goal.

I highly suspect Aahz here would argue for a GIL even without the
refcount issue, and even though I wouldn't agree, there's nothing
weird or unreasonable about the argument, it's just a different
viewpoint.


> specially if it
> became the only reason for a GIL. After all, one could argue for that goal in
> almost all languages.

"B-B-B-But other languages do it that way!" is not a big factor in
language decisions in Python.


Carl Banks

(**) - To be fair, Python didn't originally support threads, so there
was a lot of code that would have become unsafe had threading been
added without the GIL, and that probably influenced the decision to
use a GIL, but I'm sure that wasn't only reason.  Would Python have a
GIL if threading had been there from the start?  Who knows.


From kochhar.mw at gmail.com  Wed May 20 21:42:38 2009
From: kochhar.mw at gmail.com (shailesh)
Date: Wed, 20 May 2009 18:42:38 -0700 (PDT)
Subject: Wrapping methods of built-in dict
Message-ID: <c60e66f1-0bb0-45e6-951f-c8909df7ea11@w35g2000prg.googlegroups.com>

Hello,

I'm trying to write a class decorator which takes a function as an
argument and wraps instancemethods of the class with the function.

After reading a few examples on ActiveState and this blog post <http://
wordaligned.org/articles/echo>, my first attempt goes something like
this:

def tracing_wrapper(fn):
    import functools
    @functools.wraps(fn)
    def wrapped(*args, **kwargs):
        print "invoking %s(%s, %s)" % (fn.__name__, args, kwargs)
        return fn(*args, **kwargs)
    return wrapped

def factory(wrapper_fn):
    def class_wrapper(klass):
        import inspect
        for _, method in inspect.getmembers(klass, inspect.ismethod):
            setattr(klass, method.__name__, wrapper_fn(method))

        for _, fn in inspect.getmembers(klass, inspect.isfunction):
            setattr(klass, fn.__name__, staticmethod(wrapper_fn(fn)))

        return klass
    return class_wrapper

@factory(tracing_wrapper)
class MyObject(object):
    def a(self):
        print "a"

@factory(tracing_wrapper)
class MyDict(dict):
    pass

>>> a = MyObject()
>>> a.a()
invoking a((<__main__.MyObject object at 0xb7bb5bcc>,), {})
a

Naturally, when wrapping the built-in dict type, I don't get the
expected results.
>>> md = MyDict()
>>> md['hello'] = 1
>>> md.get('hello')
1

The reason as far as I understand is that the methods on the built-in
dict are not of MethodType or FunctionType so they are not included in
the result of the inspect.getmembers call and are not wrapped.

Here I'm stuck, unsure how to fix this. Could anyone suggest a way to
wrap the methods of the built-in types? This recipe <http://
code.activestate.com/recipes/252151/> for generalized proxies seems
promising, but I'm not sure how to adapt it for use here.

Thanks in advance.


From sjmachin at lexicon.net  Wed May 20 21:45:35 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 20 May 2009 18:45:35 -0700 (PDT)
Subject: u'\N{dollar sign}'
References: <862195cd-8e90-4b0d-a944-05dc21858bab@b7g2000pre.googlegroups.com>
Message-ID: <a1dd367e-c5be-419f-a7a6-baea59f65f39@c18g2000prh.googlegroups.com>

On May 21, 11:14?am, belred <bel... at gmail.com> wrote:
> i can't for the life of me figure out where the unicode \N specifier
> is located in the python documentation (2.6). ?can anyone point me to
> the page in the docs?

http://docs.python.org/reference/lexical_analysis.html#string-literals


From steven at REMOVE.THIS.cybersource.com.au  Wed May 20 22:31:29 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 21 May 2009 02:31:29 GMT
Subject: Wrapping methods of built-in dict
References: <c60e66f1-0bb0-45e6-951f-c8909df7ea11@w35g2000prg.googlegroups.com>
Message-ID: <pan.2009.05.21.02.31.28@REMOVE.THIS.cybersource.com.au>

On Wed, 20 May 2009 18:42:38 -0700, shailesh wrote:

> The reason as far as I understand is that the methods on the built-in
> dict are not of MethodType or FunctionType 


That seems to be true:

>>> type({}.get)
<type 'builtin_function_or_method'>
>>> type(dict.get)
<type 'method_descriptor'>


> so they are not included in
> the result of the inspect.getmembers call and are not wrapped.

But that isn't:

>>> zip(*inspect.getmembers(dict))[0]  # extract the names only
('__class__', '__cmp__', '__contains__', '__delattr__', '__delitem__', 
'__doc__', '__eq__', '__ge__', '__getattribute__', '__getitem__', 
'__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__', 
'__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', 
'__setattr__', '__setitem__', '__str__', 'clear', 'copy', 'fromkeys', 
'get', 'has_key', 'items', 'iteritems', 'iterkeys', 'itervalues', 'keys', 
'pop', 'popitem', 'setdefault', 'update', 'values')


So the problem isn't directly with getmembers, but with the predicate 
functions you have passed to it (inspect.isfunction and inspect.method). 
Try inspect.ismethoddescriptor instead.


Hint: dir(inspect) and help(inspect.whatever) are useful :)



-- 
Steven


From ivlenin at gmail.com  Wed May 20 23:01:23 2009
From: ivlenin at gmail.com (I V)
Date: 21 May 2009 05:01:23 +0200
Subject: Wrapping methods of built-in dict
References: <c60e66f1-0bb0-45e6-951f-c8909df7ea11@w35g2000prg.googlegroups.com>
	<pan.2009.05.21.02.31.28@REMOVE.THIS.cybersource.com.au>
Message-ID: <4a14c403$1@news.x-privat.org>

On Thu, 21 May 2009 02:31:29 +0000, Steven D'Aprano wrote:
> So the problem isn't directly with getmembers, but with the predicate
> functions you have passed to it (inspect.isfunction and inspect.method).
> Try inspect.ismethoddescriptor instead.

Or perhaps callable ? callable({}.get) and callable(dict.get) are both 
true, although I don't know if that's guaranteed (I'm wondering if 
methods could be implemented with an object such that 
method_object.__get__ returned a callable, but where method_object itself 
wasn't callable).


From mk.fraggod at gmail.com  Wed May 20 23:04:11 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Thu, 21 May 2009 09:04:11 +0600
Subject: How to get Form values in Python code and Send Email
In-Reply-To: <8ca278430905200519p7f4e2d10i6ec79b7d75d6dba8@mail.gmail.com>
References: <8ca278430905192252g67008d31qcd1da318674e30e1@mail.gmail.com>
	<8a6b8e350905200436s6a31c8dap96d6fededa451b3@mail.gmail.com>
	<8ca278430905200519p7f4e2d10i6ec79b7d75d6dba8@mail.gmail.com>
Message-ID: <20090521090411.1848e802@malediction>

On Wed, 20 May 2009 17:49:47 +0530
Kalyan Chakravarthy <kalyanchakravarthy at hyit.com> wrote:

> Hi
>     Now i can able to get the form details in to python code,
> 
> can any one tell me the format to send form values to one Emil
> id   ...  for this  I required SMTP set up?

You can use email and smtplib modules for that along with any SMTP
relay you have access to, even if it requires authentication - smtplib
has support for that.

Following example doesn't uses authentication for SMTP so you might want
to add it or you can indeed set up some SMTP on local machine (there
are really simple ones like ssmtp or msmtp, that can relay mail to
auth-enabled host).


  import smtplib
  from email.MIMEMultipart import MIMEMultipart
  from email.MIMEBase import MIMEBase
  from email.MIMEText import MIMEText
  from email.Utils import COMMASPACE, formatdate
  from email import Encoders
  import os, collections

  def send(to, subj, body, files=[], from=None, relay='localhost'):
    if not isinstance(to, collections.Iterable): to = (to,)

    msg = MIMEMultipart()
    msg['From'] = from
    msg['To'] = COMMASPACE.join(to)
    msg['Date'] = formatdate(localtime=True)
    msg['Subject'] = subj

    msg.attach( MIMEText(body) )

    for file in files:
      part = MIMEBase('application', "octet-stream")
      part.set_payload( open(file,"rb").read() )
      Encoders.encode_base64(part)
      part.add_header('Content-Disposition', 'attachment;
    filename="%s"'% os.path.basename(file)) msg.attach(part)

    smtp = smtplib.SMTP(relay)
    smtp.sendmail(from, to, msg.as_string() )
    smtp.close()



-- 
Mike Kazantsev // fraggod.net
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From kyrie at uh.cu  Wed May 20 23:10:29 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Wed, 20 May 2009 23:10:29 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com>
	<mailman.472.1242860891.8015.python-list@python.org>
	<a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
Message-ID: <1242875429.4a14c625a1eea@mail.uh.cu>


Quoting Carl Banks <pavlovevidence at gmail.com>:

> On May 20, 4:07?pm, Luis Zarrabeitia <ky... at uh.cu> wrote:
> > On Wednesday 20 May 2009 06:16:39 pm Aahz wrote:
> 
> The designers of Python made a design decision(**) that extension
> writers would not have to take care of locking.  They could have made
> a different decision, they just didn't.

Well, then, maybe that's the only python's decision so far I may not agree with.
And I'm not criticizing it... but I'm questioning it, because I honestly don't
understand it.

> > There must be another reason (i.e, the refcounts) to argue _for_ the GIL,
> 
> Why?

1- refcounts is a _very_ strong reason to argue for the GIL. Add to that
simplifying CPython implementation, and you don't really need another one on top
of that, at least not to convince me, but
2- in [almost] every other language, _you_ have to be aware of the critical
sections when multithreading. Even in pure python, you have use locks. Don't you
find at least a bit odd the argument that in the particular case you are writing
a C extension from python, you should be relieved of the burden of locking?

> > because this one just seems to be just an attempt to fix unsafe code when
> > called from python.
> 
> I think you are being unfair in calling it unsafe.

I think I was unfair calling it a "fix". It sounds like it was broken, my bad. I
should have used 'not multithread-ready'.

> Suppose if I were to call PyList_Append from a C extension.  It's not
> necessary for me to guard the list I'm calling it on with a lock,
> because only the GIL thread is allowed to call most Python API or
> otherwise access objects.  But you seem to be suggesting that since I
> didn't guard the list with a lock it is "unsafe", even though the GIL
> is sufficient?

Certainly not. If you program under the assumption that you have a GIL, of
course it is not unsafe. Not your code, anyway. But, why is PyList_Append not
multithread-ready? (or rather, why does PyList_Append would requiere a _global_
lock to be multithread ready, instead of a more local lock?) Of course, given
that the GIL exists, to use it is the easier solution, but for this particular
case, it feels like discarding multithreading just to avoid locking.

> No, I totally disagree.  The code is not "unsafe" and the GIL doesn't
> "fix" it.  The code is jsut

[I think there was a word missing from that sentence...)

> > And that was my point. Refcounts + interpreter simplicity
> > seem to imply the need for a GIL, but to make unsafe code safe without
> fixing
> > said code (or even thinking about it) is a weird goal...
> 
> Why?  Do you seriously not see the benefit of simplifying the work of
> extention writers and core maintainers?  You don't have to agree that
> it's a good trade-off but it's a perfectly reasonable goal.

I do agree that, at least for the core maintainers, it is a good trade-off and a
reasonable goal to keep CPython simple. And if that has, as a positive side
efect for extensions writers, that their code becomes easier, so be it. What I
don't agree - rather, what I don't understand, is why it is presented in the
opposite direction.

> I highly suspect Aahz here would argue for a GIL even without the
> refcount issue, and even though I wouldn't agree, there's nothing
> weird or unreasonable about the argument, it's just a different
> viewpoint.

I consider it weird, at least. If I were to say that python should not allow
multithreading to simplify the lives of pure-python programmers, I hope I would
be shot down and ignored. But somehow I must consider perfectly natural the idea
of not allowing[1] multithreading when building C extensions, to simplify the
lives of extension programmers.

> > specially if it
> > became the only reason for a GIL. After all, one could argue for that goal
> in
> > almost all languages.
> 
> "B-B-B-But other languages do it that way!" is not a big factor in
> language decisions in Python.

That's not what I said. We are not talking about the _language_, but about one
very specific implementation detail. Not even that, I'm talking about one of the
reasons presented in favor of that specific implementation detail (while
agreeing with the others). The fact that the reason I'm having trouble with is
valid for almost any other language, and none of them have a GIL-like construct
(while still being successful, and not being exceptionally hard to build native
modules for) just suggests that _that_ particular reason for that particular
implementation detail is not a very strong one, even if all other reasons are.
 
> (**) - To be fair, Python didn't originally support threads, so there
> was a lot of code that would have become unsafe had threading been
> added without the GIL, and that probably influenced the decision to
> use a GIL, but I'm sure that wasn't only reason.  Would Python have a
> GIL if threading had been there from the start?  Who knows.

(This is a very good remmark. Maybe here lies the whole answer to my question.
We may be dragging the heavy chain of backward compatibility with existing
extension modules, that is just too costly to break.)

Regards,

Luis

[1] Ok, I know that is not exactly what the GIL does.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie


-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From davea at ieee.org  Wed May 20 23:35:53 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 20 May 2009 23:35:53 -0400
Subject: Trying to understand a very simple class - from the book "dive
	into 	python"
In-Reply-To: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
References: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
Message-ID: <4A14CC19.6030200@ieee.org>



walterbyrd wrote:
> Example 5.6. Coding the FileInfo Class
> class FileInfo(UserDict):
>     "store file metadata"
>     def __init__(self, filename=ne):
>         UserDict.__init__(self)        (1)
>         self["name"] =ilename        (2)
>
>
> What I do not understand is the last line. I thought 'self' was
> supposed to refer to an instance of the object. But the square
> brackets seem to indicate a list. Except you can not assign values to
> a list like that. So where does "name" come from?
>
> I am sure this is totally simple, but I missing something.
>
>   
You're deriving your class from UserDict, which is a "Class that 
simulates a dictionary."  So you can use dictionary semantics on 
"self."  "name" is a key for the dict.






From pavlovevidence at gmail.com  Thu May 21 00:59:57 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 20 May 2009 21:59:57 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com> 
	<mailman.472.1242860891.8015.python-list@python.org>
	<a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
	<mailman.478.1242875435.8015.python-list@python.org>
Message-ID: <3e7d218e-acf3-404e-a6c0-b2b6e8a76875@y10g2000prc.googlegroups.com>

I don't have any reply to this post except for the following excerpts:

On May 20, 8:10?pm, Luis Alberto Zarrabeitia Gomez <ky... at uh.cu>
wrote:
> 2- in [almost] every other language, _you_ have to be aware of the critical
> sections when multithreading.
[snip]
> That's not what I said. We are not talking about the _language_, but about one
> very specific implementation detail. Not even that, I'm talking about one of the
> reasons presented in favor of that specific implementation detail (while
> agreeing with the others). The fact that the reason I'm having trouble with is
> valid for almost any other language, and none of them have a GIL-like construct
> (while still being successful, and not being exceptionally hard to build native
> modules for) just suggests that _that_ particular reason for that particular
> implementation detail is not a very strong one, even if all other reasons are.

No other languages have nesting by indentation (while still being
reasonablyt successful)....
etc

Comparisons to other languages are useless here.  In many cases Python
does things differently from most other languages and usually it's
better off for it.

The fact that other languages do something differently doesn't mean
that other way's better, in fact it really doesn't mean anything at
all.


Carl Banks


From davea at ieee.org  Thu May 21 01:07:00 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 21 May 2009 01:07:00 -0400
Subject: Yet another question about class property.
In-Reply-To: <b42c5a480905201821x22d815c1ic1f92631baded3c5@mail.gmail.com>
References: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>	<4A13D4B4.3030809@ieee.org>
	<b42c5a480905201821x22d815c1ic1f92631baded3c5@mail.gmail.com>
Message-ID: <4A14E174.4090003@ieee.org>

Jim Qiu wrote:
> Thanks for you patience, Dave.
> Obviously i have not got used to the python philosophy.
>
> Following you guide, i implemented the following code, and you are
> absolutely right.
>
> #!/usr/bin/python
> #coding:utf-8
>
> class Parent(object):
>
> def __init__(self):
> pass
>
> def displayAttrOfSubClass(self):
> print self.attrFromChild
>
> class Child(Parent):
> def __init__(self):
> self.attrFromChild = 'Hi, Everyone, Java does this support this trick!'
>
>
> childObj = Child()
> childObj.displayAttrOfSubClass()
>
>
> Python can use in the parent class a variable only instantiated by a
> sub-class, is this a point of advance of technique of Python?
>
> Jim
>
>   
>
(You're top-posting.  Also, for some reason the indentation is not being 
preserved in your messages.  No problem here, but more complex code 
examples would be totally illegible.)

In Python, you don't have to declare an attribute before using it.  
Rather than getting a compile-time error, like C++ or Java, you get a 
runtime error if the attribute isn't present by the time you use it.

However, if somebody (anybody) else has already defined it (assigned a 
value to it), then you can go ahead and use that value.  It's a common 
pattern with abstract base classes, and it's useful because those 
classes are never meant to be directly instantiated.

In C++ abstract classes, you have to declare all the *methods* you use, 
but you don't have to define their implementation.  You can call these 
methods, even though they don't exist in the base class, because the 
derived class will be defining them before you can get control.  
However, C++ gives no way to do that for data.

The real advantage is not that you can define a data attribute in a 
child class, but that its type can be different in each child class, and 
the base class generally need not know.



From kalyanchakravarthy at hyit.com  Thu May 21 01:31:02 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Thu, 21 May 2009 11:01:02 +0530
Subject: Error in code send Email
Message-ID: <8ca278430905202231w1b6a8cbsd50f88167b41251a@mail.gmail.com>

Hi All,


import smtplib

 mail="abc at xyz.com";
    subject="Hai";
    msg = 'Some Text';

    smtp_server = smtplib.SMTP( 'mail.%s' % mail.split( '@' )[-1] )
    smtp_server.sendmail(
          mail
        , [ mail ]
        , 'Subject: %s\n' % subject
            + 'To: %s\n' % mail
            + '\n'
            + msg
        )


I am using above  code to send an Email, for this i am not installed any
SMTP setup my local , I just given import smtplib
and I am getting following error

showing error at
 *smtp_server = smtplib.SMTP( 'mail.%s' % mail.split( '@' )[-1] )* this line

can any one tell that how to give STMP server setup in my local and run
successfully the above code.

**Traceback (most recent call last):
  File "C:\Program
Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py",
line 500, in __call__
    handler.post(*groups)
  File "C:\Documents and Settings\desk\Desktop\apps\temp\main.py",
line 129, in post
    smtp_server = smtplib.SMTP( 'mail.%s' % mail.split( '@' )[-1] )
  File "C:\Python26\lib\smtplib.py", line 239, in __init__
    (code, msg) = self.connect(host, port)
  File "C:\Python26\lib\smtplib.py", line 295, in connect
    self.sock = self._get_socket(host, port, self.timeout)
  File "C:\Python26\lib\smtplib.py", line 273, in _get_socket
    return socket.create_connection((port, host), timeout)
AttributeError: 'module' object has no attribute 'create_connection'



-- 
Regards
Kalyan
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From aotto1968 at t-online.de  Thu May 21 01:56:30 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Thu, 21 May 2009 07:56:30 +0200
Subject: PYTHONPATH on Windows XP module load problem
References: <guubg7$nnk$03$1@news.t-online.com>
	<mailman.390.1242742113.8015.python-list@python.org>
	<guuh3f$47k$00$1@news.t-online.com>
	<SbSdncYZUsrgT4_XnZ2dnUVZ_s2dnZ2d@pdx.net>
	<gv0gca$tlf$00$1@news.t-online.com>
	<ybadndVhzcxaGYnXnZ2dnUVZ_t2dnZ2d@pdx.net>
Message-ID: <gv2qef$8k8$03$1@news.t-online.com>

Hi,

  I setup the PYTHONPATH environment variable too

  does windows use this variable ?


mfg

  Andreas Otto


From conra2004 at yahoo.com  Thu May 21 03:55:45 2009
From: conra2004 at yahoo.com (yadin)
Date: Thu, 21 May 2009 00:55:45 -0700 (PDT)
Subject: finding repeated data sequences in a column
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>
	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com> 
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com> 
	<c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com> 
	<mailman.456.1242841999.8015.python-list@python.org>
Message-ID: <f0c45029-3983-4a84-8f08-2b497594c03e@r34g2000vbi.googlegroups.com>

On May 20, 6:53?pm, norseman <norse... at hughes.net> wrote:
> bearophileH... at lycos.com wrote:
> > yadin:
> >> How can I build up a program that tells me that this sequence
> >> 1000028706
> >> 1000028707
> >> 1000028708
> >> is repeated somewhere in the column, and how can i know where?
>
> > Can such patterns nest? That is, can you have a repeated pattern made
> > of an already seen pattern plus something else?
> > If you don't want a complex program, then you may need to specify the
> > problem better.
>
> > You may want something like LZ77 or releated (LZ78, etc):
> >http://en.wikipedia.org/wiki/LZ77
> > This may have a bug:
> >http://code.activestate.com/recipes/117226/
>
> > Bye,
> > bearophile
>
> ============================================
> index on column
> Ndx1 is set to index #1
> Ndx2 is set to index #2
> test Ndx1 against Ndx2
> ? ?if equal write line number and column content to a file
> ? ? ? ? ? ?(that's two things on one line: ?15 1000028706
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?283 1000028706 )
> ? ?Ndx1 is set to Ndx2
> ? ?Ndx2 is set to index #next
> loop to test ? ?writing out each duplicate set
>
> Then use the outfile and index on line number
>
> In similar manor, check if line current and next line line numbers are
> sequential. ?If so scan forward to match column content of lower line
> number and check first matched column's line number and next for
> sequential. ?Print them out if so
>
> everything in outfile has 1 or more duplicates
>
> 4 ?aa ? ? ? ? ? ? ? |--
> 5 ?bb ? ? ? ? |-- ? ? ?| ? ? ?thus 4/5 match 100/101
> 6 ?cc ? ? ? ? ? ?| ? ? |
> . ? ? ? ? ? ? ? ?| ? ? |
> 100 aa ? ? ? ? ? | ?|--
> 101 bb ? ? ? ? |--
> 102 ddd
> 103 cc ? ? ? ? ? ? ? ? ?there is a duplicate but not a sequence
> 200 ff
>
> mark duplicate sequences as tested and proceed on through
> ? ?seq1 may have more than one other seq in file.
> ? ?the progress is from start to finish without looking back
> ? ?thus each step forward has fewer lines to test.
> ? ?marking already knowns eliminates redundant sequence testing.
>
> By subseting on pass1 the expensive testing is greatly reduced.
> If you know your subset data won't exceed memory then the "outfile"
> can be held in memory to speed things up considerably.
>
> Today is: 20090520
> no code
>
> Steve- Hide quoted text -
>
> - Show quoted text -

this is the program...I wrote but is not working
I have a list of valves, and another of pressures;
If I am ask to find out which ones are the valves that are using all
this set of pressures, wanted best pressures
this is the program i wrote but is not working properly, it suppossed
to return in the case
find all the valves that are using pressures 1 "and" 2 "and" 3.
It returns me A, A2, A35....
The correct answer supposed to be A and A2...
if I were asked for pressures 56 and 78 the correct answer supossed to
be valves G and G2...

Valves = ['A','A','A','G', 'G', 'G',
'C','A2','A2','A2','F','G2','G2','G2','A35','A345','A4'] ##valve names
pressures = [1,2,3,4235,56,78,12, 1, 2, 3, 445, 45,56,78,1, 23,7] ##
valve pressures
result = []

bestpress = [1,2,3] ##wanted base pressures
print bestpress,'len bestpress is' , len(bestpress)

print len(Valves)
print len(Valves)
for j in range(len(Valves)):
#for i in range(len(bestpress)):
    #for j in range(len(Valves)):
    for i in range(len(bestpress)-2):
            if pressures [j]== bestpress[i] and bestpress [i+1]
==pressures [j+1] and bestpress [i+2]==pressures [j+2]:
                result.append(Valves[j])
                #i = i+1
                #j = j+1
            # print i, j, bestpress[i]
                print "common PSVs are", result


From http  Thu May 21 04:30:18 2009
From: http (Paul Rubin)
Date: 21 May 2009 01:30:18 -0700
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com>
	<mailman.472.1242860891.8015.python-list@python.org>
	<a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
Message-ID: <7xfxey7t9h.fsf@ruckus.brouhaha.com>

Carl Banks <pavlovevidence at gmail.com> writes:
> Why?  Do you seriously not see the benefit of simplifying the work of
> extention writers and core maintainers?  You don't have to agree that
> it's a good trade-off but it's a perfectly reasonable goal.
> 
> I highly suspect Aahz here would argue for a GIL even without the
> refcount issue, and even though I wouldn't agree, there's nothing
> weird or unreasonable about the argument, it's just a different
> viewpoint.

How about only setting a lock when a "safe" user extension is called.
There could also be an "unsafe" extension interface with no lock.  The
more important stdlib functions would be (carefully) written with the
unsafe interface.  Ordinary python code would not need a lock.  


From greg at cosc.canterbury.ac.nz  Thu May 21 04:33:51 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Thu, 21 May 2009 20:33:51 +1200
Subject: Import and absolute file names, sys.path including ''... or not
In-Reply-To: <mailman.462.1242849723.8015.python-list@python.org>
References: <mailman.406.1242754524.8015.python-list@python.org>	<gv1jhr$5q3$1@panix3.panix.com>
	<mailman.462.1242849723.8015.python-list@python.org>
Message-ID: <77khsuF1hhc36U1@mid.individual.net>

Jean-Michel Pichavant wrote:

> __import__('/home/jeanmichel/test')

The __import__ function takes *module* names, not
filesystem pathnames.

Giving it a pathname might happen to work some of
the time in some versions of Python, but it's not
an intended feature, and you shouldn't rely on it.

If you want to execute the contents of an arbitrary
file, rather than a module existing somewhere in the
Python module namespace, use execfile().

-- 
Greg


From __peter__ at web.de  Thu May 21 04:41:44 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 21 May 2009 10:41:44 +0200
Subject: finding repeated data sequences in a column
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>
	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
	<c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com>
	<mailman.456.1242841999.8015.python-list@python.org>
	<f0c45029-3983-4a84-8f08-2b497594c03e@r34g2000vbi.googlegroups.com>
Message-ID: <gv3448$qm5$03$1@news.t-online.com>

yadin wrote:

> On May 20, 6:53 pm, norseman <norse... at hughes.net> wrote:
>> bearophileH... at lycos.com wrote:
>> > yadin:
>> >> How can I build up a program that tells me that this sequence
>> >> 1000028706
>> >> 1000028707
>> >> 1000028708
>> >> is repeated somewhere in the column, and how can i know where?
>>
>> > Can such patterns nest? That is, can you have a repeated pattern made
>> > of an already seen pattern plus something else?
>> > If you don't want a complex program, then you may need to specify the
>> > problem better.
>>
>> > You may want something like LZ77 or releated (LZ78, etc):
>> >http://en.wikipedia.org/wiki/LZ77
>> > This may have a bug:
>> >http://code.activestate.com/recipes/117226/
>>
>> > Bye,
>> > bearophile
>>
>> ============================================
>> index on column
>> Ndx1 is set to index #1
>> Ndx2 is set to index #2
>> test Ndx1 against Ndx2
>> if equal write line number and column content to a file
>> (that's two things on one line:  15 1000028706
>> 283 1000028706 )
>> Ndx1 is set to Ndx2
>> Ndx2 is set to index #next
>> loop to test    writing out each duplicate set
>>
>> Then use the outfile and index on line number
>>
>> In similar manor, check if line current and next line line numbers are
>> sequential.  If so scan forward to match column content of lower line
>> number and check first matched column's line number and next for
>> sequential.  Print them out if so
>>
>> everything in outfile has 1 or more duplicates
>>
>> 4  aa               |--
>> 5  bb         |--      |      thus 4/5 match 100/101
>> 6  cc            |     |
>> .                |     |
>> 100 aa           |  |--
>> 101 bb         |--
>> 102 ddd
>> 103 cc                  there is a duplicate but not a sequence
>> 200 ff
>>
>> mark duplicate sequences as tested and proceed on through
>> seq1 may have more than one other seq in file.
>> the progress is from start to finish without looking back
>> thus each step forward has fewer lines to test.
>> marking already knowns eliminates redundant sequence testing.
>>
>> By subseting on pass1 the expensive testing is greatly reduced.
>> If you know your subset data won't exceed memory then the "outfile"
>> can be held in memory to speed things up considerably.
>>
>> Today is: 20090520
>> no code
>>
>> Steve- Hide quoted text -
>>
>> - Show quoted text -
> 
> this is the program...I wrote but is not working
> I have a list of valves, and another of pressures;
> If I am ask to find out which ones are the valves that are using all
> this set of pressures, wanted best pressures
> this is the program i wrote but is not working properly, it suppossed
> to return in the case
> find all the valves that are using pressures 1 "and" 2 "and" 3.
> It returns me A, A2, A35....
> The correct answer supposed to be A and A2...
> if I were asked for pressures 56 and 78 the correct answer supossed to
> be valves G and G2...
> 
> Valves = ['A','A','A','G', 'G', 'G',
> 'C','A2','A2','A2','F','G2','G2','G2','A35','A345','A4'] ##valve names
> pressures = [1,2,3,4235,56,78,12, 1, 2, 3, 445, 45,56,78,1, 23,7] ##
> valve pressures
> result = []
> 
> bestpress = [1,2,3] ##wanted base pressures
> print bestpress,'len bestpress is' , len(bestpress)
> 
> print len(Valves)
> print len(Valves)
> for j in range(len(Valves)):
> #for i in range(len(bestpress)):
>     #for j in range(len(Valves)):
>     for i in range(len(bestpress)-2):
>             if pressures [j]== bestpress[i] and bestpress [i+1]
> ==pressures [j+1] and bestpress [i+2]==pressures [j+2]:
>                 result.append(Valves[j])
>                 #i = i+1
>                 #j = j+1
>             # print i, j, bestpress[i]
>                 print "common PSVs are", result

If I understand your explanation correctly you don't actually care about the 
sequence, you just want all valves that show the pressures specified in 
bestpress. If that's correct your problem becomes easier. You can make a 
lookup table that maps a given pressure to a set of all valves that had it 
and then calculate the intersection.

from collections import defaultdict

def intersection(sets):
    return reduce(set.intersection, sets)

valves = ['A', 'A', 'A', 'G', 'G', 'G', 'C', 'A2', 'A2', 'A2', 'F', 'G2', 
'G2', 'G2', 'A35', 'A345', 'A4']
pressures = [1, 2, 3, 4235, 56, 78, 12, 1, 2, 3, 445, 45, 56, 78, 1, 23, 7]

lookup = defaultdict(set)
for v, p in zip(valves, pressures):
    lookup[p].add(v)

result = []

wanted_pressures = [1, 2, 3]
print wanted_pressures, "-->", intersection(lookup[p] for p in 
wanted_pressures)

Peter



From duncan.booth at invalid.invalid  Thu May 21 04:46:38 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 21 May 2009 08:46:38 GMT
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.407.1242754952.8015.python-list@python.org>
	<guv968$2l5j$1@adenine.netfront.net>
	<de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>
	<mailman.455.1242841600.8015.python-list@python.org>
	<0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>
	<gv1nor$10uu$1@adenine.netfront.net>
Message-ID: <Xns9C1262ED6DA67duncanbooth@127.0.0.1>

namekuseijin <namekuseijin at gmail.com> wrote:

> I find it completely unimaginable that people would even think 
> suggesting the idea that Java is simpler.  It's one of the most stupidly 
> verbose and cranky languages out there, to the point you can't really do 
> anything of relevance without an IDE automatically pumping out lots of 
> scaffold code for you.
> 

But that means Java programmers are obviously more productive than Python 
programmers: they produce many more lines of code per day even if much of 
it is boileplate or even automatically generated. Managers like that.

OTOH, I consider it a productive day if I end up with fewer lines of code 
than I started with.

-- 
Duncan Booth http://kupuguy.blogspot.com


From duncan.booth at invalid.invalid  Thu May 21 04:46:38 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 21 May 2009 08:46:38 GMT
Subject: reseting an iterator
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
	<pan.2009.05.21.00.47.48@REMOVE.THIS.cybersource.com.au>
Message-ID: <Xns9C12623BF4E9Eduncanbooth@127.0.0.1>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

> On Wed, 20 May 2009 11:35:47 -0700, Jan wrote:
> 
>> Wouldn't it be easy for Python to implement generating functions so that
>> the iterators they return are equipped with a __reset__() method?
> 
> No.
> 
> def gen():
>     for name in os.listdir('.'):
>         yield open(name).read()
>         os.remove(name)
> 
> 
> How would you "easily" reset this generator so that it returns the same 
> values each time?
> 
> That's an extreme example, but as a general rule, generators/iterators 
> are one-shot: having consumed a value, you can't get it back again 
> without re-creating it from scratch, or possibly not even then. Here's a 
> less destructive example:
> 
> def gen():
>     for i in xrange(10):
>         yield time.time()
> 

While I agree 100% with your 'No', I don't actually agree with your 
explanation.

Why are you assuming that resetting a generator should return the same 
values each time? Why shouldn't resetting put it back to some known state, 
but allow the resulting output to vary?

For example, that's what happens in the .Net universe with Linq: a Linq 
expression is roughly equivalent to a Python iterable and every time you 
iterate over it you can get a different set of results.

The following code would, I think, work except that generators don't allow 
you to add attributes:

from functools import wraps
def resettable(generator):
	@wraps(generator)
	def wrapper(*args, **kw):
		def __reset__():
		    gen = generator(*args, **kw)
		    gen.__reset__ = __reset__
		    return gen
		return __reset__()
	return wrapper

@resettable
def gen(n):
	for i in xrange(n):
		yield i, time.time()

		
import time
it = gen(3)
for v in it: print v
it = it.__reset__()
for v in it: print v


The simpler solution is just to reconstruct the iterator yourself.

-- 
Duncan Booth http://kupuguy.blogspot.com


From deets at nospam.web.de  Thu May 21 04:51:54 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 21 May 2009 10:51:54 +0200
Subject: scoping problem with list comprehension // learning Python
In-Reply-To: <mailman.470.1242857251.8015.python-list@python.org>
References: <mailman.470.1242857251.8015.python-list@python.org>
Message-ID: <77kj1aF1hun0qU1@mid.uni-berlin.de>

Adrian Dragulescu schrieb:
> 
> I just started to learn python (first posting to the list).
> 
> I have a list of dates as strings  that I want to convert to a list of 
> datetime objects.  Here is my debugging session from inside a method.
> 
> (Pdb) formatIndex
> '%Y-%m-%d'
> (Pdb) [datetime.strptime(i, formatIndex) for i in self.index[0:3]]
> *** NameError: global name 'formatIndex' is not defined
> (Pdb) [datetime.strptime(i, '%Y-%m-%d') for i in self.index[0:3]]
> [datetime.datetime(2007, 1, 3, 0, 0), datetime.datetime(2007, 1, 4, 0, 
> 0), datetime.datetime(2007, 1, 5, 0, 0)]
> (Pdb)
> 
> How come I get an error that formatIndex is not defined? I just show 
> that it has value '%Y-%m-%d', in the same method scope.  Not sure why it 
> says "global name", as I am in a method.
> 
> If I run it as a stand-alone, it works:
>   index = ['2007-01-01', '2007-01-02', '2007-01-03']
>   formatIndex = '%Y-%m-%d'
>   print([datetime.strptime(i, formatIndex) for i in index])
> 
> Any suggestions much appreciated.  I'm sure it's something trivial.  I'm 
> using Python30.

I think your problem here is Pdb. You can't always assume that scoping 
and assignment works there as desired.

If you do the same in the interpreter instead of Pdb, does it work? It 
works for me in Py2.5, don't have a 3.0 handy.

Diez


From lie.1296 at gmail.com  Thu May 21 04:55:00 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 21 May 2009 08:55:00 GMT
Subject: Adding a Par construct to Python?
In-Reply-To: <a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com>
	<mailman.472.1242860891.8015.python-list@python.org>
	<a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
Message-ID: <EF8Rl.12489$y61.3592@news-server.bigpond.net.au>

Carl Banks wrote:
>> There must be another reason (i.e, the refcounts) to argue _for_ the GIL,
> 
> Why?

Nobody likes GIL, but it just have to be there or things starts crumbling...

Nobody would actually argue _for_ GIL, they just know from experience, 
that people that successfully GIL in the past, always produces 
unsatisfactory solution.

Among them are slowing down single threaded code, locking issues, etc.

They are not really arguments _for_ GIL, but a challenge for the next 
people that tries to remove it to think about before dedicating the rest 
of their life to removing GIL; only to found that nobody likes the 
solution...


From rustompmody at gmail.com  Thu May 21 05:22:18 2009
From: rustompmody at gmail.com (Rustom Mody)
Date: Thu, 21 May 2009 14:52:18 +0530
Subject: making a python program in windows
Message-ID: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>

I know how to make a python script behave like a (standalone) program
in unix --
1. put a #! path/to/python as the first line
2. make the file executable

The closest I know how to do this in windows is:
r-click the file in win-explorer
goto properties
goto open with
change pythonw to python

Can someone enlighten me about a more scriptish way of doing this?
Basically if I have to setup that program on other (windows) m/cs is
there some .bat or .vbs or some regedit thingy Ive to do to avoid the
Rt-click routine?


From martin.hellwig at dcuktec.org  Thu May 21 06:19:58 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 21 May 2009 11:19:58 +0100
Subject: making a python program in windows
In-Reply-To: <mailman.488.1242897741.8015.python-list@python.org>
References: <mailman.488.1242897741.8015.python-list@python.org>
Message-ID: <l-OdnQ3QTPFTt4jXnZ2dnUVZ8tJi4p2d@bt.com>

Rustom Mody wrote:
> I know how to make a python script behave like a (standalone) program
> in unix --
> 1. put a #! path/to/python as the first line
> 2. make the file executable
> 
> The closest I know how to do this in windows is:
> r-click the file in win-explorer
> goto properties
> goto open with
> change pythonw to python
> 
> Can someone enlighten me about a more scriptish way of doing this?
> Basically if I have to setup that program on other (windows) m/cs is
> there some .bat or .vbs or some regedit thingy Ive to do to avoid the
> Rt-click routine?

Since you don't know for sure if a Python environment is available on 
the other windows machine and whether the file associations are 
configured correctly, the best thing you can do is to use something like 
py2exe and distribute the result of that.

-- 
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'


From sion at viridian.paintbox  Thu May 21 06:47:17 2009
From: sion at viridian.paintbox (Sion Arrowsmith)
Date: Thu, 21 May 2009 10:47:17 GMT
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>
	<gv1nor$10uu$1@adenine.netfront.net>
	<Xns9C1262ED6DA67duncanbooth@127.0.0.1>
Message-ID: <ViaRl.95042$Ku5.64377@newsfe10.ams2>

Duncan Booth  <duncan.booth at suttoncourtenay.org.uk> wrote:
>namekuseijin <namekuseijin at gmail.com> wrote:
>> I find it completely unimaginable that people would even think 
>> suggesting the idea that Java is simpler.  It's one of the most stupidly 
>> verbose and cranky languages out there, to the point you can't really do 
>> anything of relevance without an IDE automatically pumping out lots of 
>> scaffold code for you.
>But that means Java programmers are obviously more productive than Python 
>programmers: they produce many more lines of code per day even if much of 
>it is boileplate or even automatically generated. Managers like that.
>
>OTOH, I consider it a productive day if I end up with fewer lines of code 
>than I started with.

A friend once justified a negative LOC count as being the sign of a
good day with the following observation:

Code that doesn't exist contains no bugs.
Code that doesn't exist takes no time to execute.
Code that doesn't exist takes up no space.
Code that doesn't exist doesn't need maintenance.

Once, when faced with a rather hairy problem that client requirements
dictated a pure Java solution for, I coded up a fully functional
prototype in Python to get the logic sorted out, and then translated
it. Even given the optimisations of manual translation, and being
able to dispose of one portion of the Python which Java supplied the
functionality for out of the box (thread timeout, I think it was),
the code grew by 200%. That was a very unproductive day.

-- 
\S

   under construction



From rustompmody at gmail.com  Thu May 21 07:01:20 2009
From: rustompmody at gmail.com (rustom)
Date: Thu, 21 May 2009 04:01:20 -0700 (PDT)
Subject: making a python program in windows
References: <mailman.488.1242897741.8015.python-list@python.org> 
	<l-OdnQ3QTPFTt4jXnZ2dnUVZ8tJi4p2d@bt.com>
Message-ID: <c361a5d5-e63a-4117-8c55-21ae31245ff2@b6g2000pre.googlegroups.com>

On May 21, 3:19?pm, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> Rustom Mody wrote:
> > I know how to make a python script behave like a (standalone) program
> > in unix --
> > 1. put a #! path/to/python as the first line
> > 2. make the file executable
>
> > The closest I know how to do this in windows is:
> > r-click the file in win-explorer
> > goto properties
> > goto open with
> > change pythonw to python
>
> > Can someone enlighten me about a more scriptish way of doing this?
> > Basically if I have to setup that program on other (windows) m/cs is
> > there some .bat or .vbs or some regedit thingy Ive to do to avoid the
> > Rt-click routine?
>
> Since you don't know for sure if a Python environment is available on
> the other windows machine and whether the file associations are
> configured correctly, the best thing you can do is to use something like
> py2exe and distribute the result of that.

Oh - Oh! Not an exe please! I dont want to move away from readable
text files if possible.

I certainly know that python2.6 is installed.
Why that installation by default does not put python.exe on the path I
dont know but that is best corrected by hand.

Bottom Line: Assume that from a command line (cmd) python runs and
gives its interpreter prompt.
When run from cygwin it hangs but thats another story. Just dont
assume cygwin.

i suppose the question is entirely about setting properly (and
grokking) file associations -- why is a .py file associated with
pythonw and not python? And is making this association right enough to
make a .py file in windows behave like a shebang file in unix?

[And is there a more appropriate list for such questions?]

Thanks


From stef.mientki at gmail.com  Thu May 21 07:11:02 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Thu, 21 May 2009 13:11:02 +0200
Subject: making a python program in windows
In-Reply-To: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>
References: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>
Message-ID: <4A1536C6.3080101@gmail.com>

Rustom Mody wrote:
> I know how to make a python script behave like a (standalone) program
> in unix --
> 1. put a #! path/to/python as the first line
> 2. make the file executable
>
> The closest I know how to do this in windows is:
> r-click the file in win-explorer
> goto properties
> goto open with
> change pythonw to python
>
> Can someone enlighten me about a more scriptish way of doing this?
> Basically if I have to setup that program on other (windows) m/cs is
> there some .bat or .vbs or some regedit thingy 
Python can replace all of that ;-)
But to your orginal question,
why not change the file associate in windows ?

cheers,
Stef


From ldo at geek-central.gen.new_zealand  Thu May 21 07:18:15 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 21 May 2009 23:18:15 +1200
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
References: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>
	<51d1dd3f-322d-47fa-9d44-75b92c6ef4e2@e20g2000vbc.googlegroups.com>
	<2003c02c-6a9f-40fb-b19c-30625ed09eb0@s21g2000vbb.googlegroups.com>
	<fc58e391-7979-4220-b6c9-a06c23ee4dbb@21g2000vbk.googlegroups.com>
Message-ID: <gv3d9n$k1p$1@lust.ihug.co.nz>

In message <fc58e391-7979-4220-b6c9-
a06c23ee4dbb at 21g2000vbk.googlegroups.com>, henning.vonbargen at arcor.de wrote:

> I'm used to "configure; make; make install", which usually works well on
> other platforms...

It's often worthwhile to try

    ./configure --help

and see if any of the options might be relevant.



From srijayanth at gmail.com  Thu May 21 07:23:36 2009
From: srijayanth at gmail.com (Srijayanth Sridhar)
Date: Thu, 21 May 2009 16:53:36 +0530
Subject: A question regd configobj
Message-ID: <5ead360a0905210423q526e21ffgad3be1415ac148dd@mail.gmail.com>

Hello,

I am wondering if it is possible to have hexadecimal strings in a ini file
and have configobj parse it correctly.

for eg:
moonwolf at trantor:~/python/config$ cat foo
foo="\x96\x97"
.
.
.
>>> a=ConfigObj("foo")
>>> a
ConfigObj({'foo': '\\x96\\x97'})
>>> a['foo']
'\\x96\\x97'

As you can see the string has escaped the '\' and I want to suppress that
behavior. I've looked at the documentation and haven't been able to figure
out if this is an available feature or not.

Any help will be greatly appreciated.

Thank you,

Jayanth
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From gandalf at shopzeus.com  Thu May 21 07:25:04 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Thu, 21 May 2009 13:25:04 +0200
Subject: dbfpy - cannot store new record
Message-ID: <4A153A10.1080906@shopzeus.com>

Given this example program:

import dbfpy
def dbf_open(tblname):
    fpath = os.path.join(local.DB_DIR,tblname)
    f = file(fpath,"ab+")
    f.seek(0)
    tbl = dbf.Dbf(f)
    return tbl

tbl = dbf_open("partners.dbf")
rec = tbl.newRecord()
rec["FIELDNAME1"] = 1
rec["FIELDNAME2"] = "Somebody"
rec.store()
tbl.close()

I get no exception, no error etc. But the new record is NOT appended to 
the table. What is wrong here?

Thanks,

   Laszlo



From aotto1968 at t-online.de  Thu May 21 07:37:47 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Thu, 21 May 2009 13:37:47 +0200
Subject: PYTHONPATH on Windows XP module load problem
References: <guubg7$nnk$03$1@news.t-online.com>
	<mailman.390.1242742113.8015.python-list@python.org>
	<guuh3f$47k$00$1@news.t-online.com>
	<SbSdncYZUsrgT4_XnZ2dnUVZ_s2dnZ2d@pdx.net>
	<gv0gca$tlf$00$1@news.t-online.com>
	<ybadndVhzcxaGYnXnZ2dnUVZ_t2dnZ2d@pdx.net>
	<gv2qef$8k8$03$1@news.t-online.com>
Message-ID: <gv3eeb$gg3$00$1@news.t-online.com>

Hi,

  I solved the problem ...
  thank you for your help


mfg

  Andreas Otto


From mypromise at sina.com  Thu May 21 07:57:27 2009
From: mypromise at sina.com (zhouhaifeng)
Date: Thu, 21 May 2009 19:57:27 +0800
Subject: How to send a compsite key to window
Message-ID: <4A1541A7.3020404@sina.com>

just like "ctrl + A",

I want to select all the text in a window, now , I operate right menu to
get it, but it can not work all the time.
so I want to send "ctrl + a" to the window


blow is my code
thanks


hWnd = win32gui.FindWindow(None, "????????????????V1.09-?
????")
print hWnd
if hWnd <> 0:
print "????????"
point = (755, 175)
x, y = point
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)
print "????"
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTUP, x, y, 0, 0)

win32api.Sleep(1000)

#??"??"
x = x + 10
y = y + 115
point = (x, y)
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)

win32api.Sleep(500)

#????
point = (455, 175)
x, y = point
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTUP, x, y, 0, 0)
#win32api.SendMessage(hwnd, win32con.WM_KEYDOWN, win32con.VK_CONTROL, 0)
#win32api.SendMessage(hwnd, win32con.WM_KEYUP, win32con.VK_CONTROL, 0)
win32api.Sleep(500)

#??"??"
x = x + 10
y = y + 25
point = (x, y)
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)


From redforks at gmail.com  Thu May 21 08:07:50 2009
From: redforks at gmail.com (Red Forks)
Date: Thu, 21 May 2009 20:07:50 +0800
Subject: defaultdict's bug or feature?
Message-ID: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>

from collections import defaultdict

d = defaultdict(set)
assert isinstance(d['a'], set)
assert isinstance(d.get('b'), set)

d['a'] is ok, and a new set object is insert to d, but d.get('b') won't.

It's a bug, or just a feature?

I think dict.get() method is just a *safe* version of dict[key], maybe it
should be:

def get(self, key, default = None):
  try:
    return self[key]
  except KeyError:
    return default
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From youhvee at googlemail.com  Thu May 21 08:08:39 2009
From: youhvee at googlemail.com (youhvee at googlemail.com)
Date: Thu, 21 May 2009 05:08:39 -0700 (PDT)
Subject: A list with periodic boundary conditions
Message-ID: <0f324d00-875a-4d18-bd8b-981997a34e44@q14g2000vbn.googlegroups.com>

Hi,

I'm trying to create a new class of list that has periodic boundary
conditions.

Here's what I have so far:

class wrappedList(list):
    def __getitem__(self, p):
        return list.__getitem__(self, p%len(self))
    def __setitem__(self, p, v):
        list.__setitem__(self, p%len(self), v)

>>>> a=wrappedList(range(10))
>>>> a[1]
1
>>>> a[11]
1

But I would also like to make slices. For instance I would like
>>>> a[8:11]
[8, 9, 0]

I can do it by copying, but I want to return a view to the original
data, and I have no idea where to start. It seems that the slice needs
to retain some knowledge of the list from which it derived. i.e. it
needs to know that it is a slice. Any ideas on how I can extend this
to allow views?

Thanks for any help.

-AM


From duncan.booth at invalid.invalid  Thu May 21 08:09:49 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 21 May 2009 12:09:49 GMT
Subject: making a python program in windows
References: <mailman.488.1242897741.8015.python-list@python.org>
	<l-OdnQ3QTPFTt4jXnZ2dnUVZ8tJi4p2d@bt.com>
	<c361a5d5-e63a-4117-8c55-21ae31245ff2@b6g2000pre.googlegroups.com>
Message-ID: <Xns9C1284B6480C9duncanbooth@127.0.0.1>

rustom <rustompmody at gmail.com> wrote:

> i suppose the question is entirely about setting properly (and
> grokking) file associations -- why is a .py file associated with
> pythonw and not python? And is making this association right enough to
> make a .py file in windows behave like a shebang file in unix?

I think the question about the file association is one you have to answer 
for yourself. When you install Python it associates .pyw with pythonw and 
.py with python. If something on your system has changed this the best 
thing you can do is to change it back.

Try typing the following commands and then fixing any differences by typing 
the expected output as the command parameter 
(e.g. "assoc .py=Python.File"):

C:\>assoc .py
.py=Python.File

C:\>assoc .pyw
.pyw=Python.NoConFile

C:\>ftype Python.file
Python.file="C:\Python26\python.exe" "%1" %*

C:\>ftype Python.NoConFile
Python.NoConFile="C:\Python26\pythonw.exe" "%1" %*


-- 
Duncan Booth http://kupuguy.blogspot.com


From antoine.mechelynck at gmail.com  Thu May 21 08:27:13 2009
From: antoine.mechelynck at gmail.com (Tony Mechelynck)
Date: Thu, 21 May 2009 14:27:13 +0200
Subject: [ANN] vim patch to support python3 interface
In-Reply-To: <OFE2EA6A30.933C8862-ONC12575B4.0058ED0E-C12575B4.005B2741@br-automation.com>
References: <OFE2EA6A30.933C8862-ONC12575B4.0058ED0E-C12575B4.005B2741@br-automation.com>
Message-ID: <4A1548A1.1040101@gmail.com>

On 12/05/09 18:35, Roland Puntaier wrote:
> Hello,
>
> I have ported vim's python interface (if_python.c) to the python3 C-API.
>
> The changed files are:
> - Makefile (for linux)
> - Make_mvc.mak (for windows)
> - if_python3.c is a new file for the python3 related sources. it is based
> on if_python.c.
>
> All of them are in the ``src`` subdirectory.
[...]

Make_mvc.mak is not, and by far, the only makefile used by people who 
build Vim on Windows. If you want your port to become the "main" version 
some day, patches for the other makefiles should also be available. For 
instance, Steve Hall (who maintains the Vim builds, with and without 
Cream, but with Python et al., hosted with the Cream project) uses, I 
think, the Make_cyg.mak -- and I've seen now and again posts by Windows 
users building by means of the Make_ming.mak too. I've used the 
make_bc5.mak in the past, but the problems I had with it (when trying to 
use Unicode in Vim on Win98) made me switch to Make_cyg.mak even before 
moving up to XP and then to Linux-only; but my HowTo "for Windows" still 
includes settings for it.


Best regards,
Tony.
-- 
The greatest dangers to liberty lurk in insidious encroachment by men
of zeal, well-meaning but without understanding.
		-- Justice Louis D. Brandeis


From aotto1968 at t-online.de  Thu May 21 08:35:09 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Thu, 21 May 2009 14:35:09 +0200
Subject: ANNOUNCE: libmsgque 3.2
Message-ID: <gv3hpu$l6b$03$1@news.t-online.com>


ANNOUNCE a minor feature improvement of libmsgque ...


What is LibMsgque
=================

LibMsgque is an OS independent, Programming Language independent and
Hardware independent solution to link applications together to act like a
single application. Or with other words, LibMsgque is an Application-Server
toolkit.


Highlights of the current Release:
=================================

This release introduce a new windows build into the LibMsgque world.
The build switched from the GNU toolchain to "Visual C++ 2008 Express"

This is the official statement for this switch:

  The decision to use GNU tools on Windows including
  automake, autoconf, libtool and mingw was wrong.
  The tools were replaced by Visual C++ 2008 Express.
  The reason was the extremely low performance of the
  GNU tools on Windows which end up in a 20min overhead per
  configuration life-cycle and a 5min overhead per build.
  This end up in an additional TCO of 2000euro per release.


In addition the performance-comparison between "c", "tcl", "python"
and "java" was updated

  -> results: http://libmsgque.sourceforge.net/performance.htm

After quite a wile I'm now able to support python on windows


The Web-Site was updated:
=========================

? ?-> http://libmsgque.sourceforge.net

? For a fast introduction use the following URL:

? ?-> http://libmsgque.sourceforge.net/features.htm



mfg

? Andreas Otto


From mypromise at sina.com  Thu May 21 08:38:26 2009
From: mypromise at sina.com (zhouhaifeng)
Date: Thu, 21 May 2009 20:38:26 +0800
Subject: How to send a compsite key to window
Message-ID: <4A154B42.1040306@sina.com>

just like "ctrl + A",

I want to select all the text in a window, now , I operate right menu to
get it, but it can not work all the time.
so I want to send "ctrl + a" to the window


blow is my code
thanks


hWnd = win32gui.FindWindow(None, "????????????????V1.09-?
????")
print hWnd
if hWnd <> 0:
print "????????"
point = (755, 175)
x, y = point
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)
print "????"
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTUP, x, y, 0, 0)

win32api.Sleep(1000)

#??"??"
x = x + 10
y = y + 115
point = (x, y)
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)

win32api.Sleep(500)

#????
point = (455, 175)
x, y = point
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTUP, x, y, 0, 0)
#win32api.SendMessage(hwnd, win32con.WM_KEYDOWN, win32con.VK_CONTROL, 0)
#win32api.SendMessage(hwnd, win32con.WM_KEYUP, win32con.VK_CONTROL, 0)
win32api.Sleep(500)

#??"??"
x = x + 10
y = y + 25
point = (x, y)
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)



From google at mrabarnett.plus.com  Thu May 21 08:41:56 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 13:41:56 +0100
Subject: defaultdict's bug or feature?
In-Reply-To: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
Message-ID: <4A154C14.1040805@mrabarnett.plus.com>

Red Forks wrote:
> from collections import defaultdict
> 
> d = defaultdict(set)
> assert isinstance(d['a'], set)
> assert isinstance(d.get('b'), set)
> 
> d['a'] is ok, and a new set object is insert to d, but d.get('b') won't.
> 
> It's a bug, or just a feature?
> 
A feature.

> I think dict.get() method is just a /safe/ version of dict[key], maybe 
> it should be:
>  
> def get(self, key, default = None):
>   try:
>     return self[key]
>   except KeyError:
>     return default
> 
Isn't that what it does already?


With dict you have the choice of whether to raise an exception or return 
a default value if the key is missing.

With defaultdict you have the choice of whether to add the value or
return a default value if the key is missing.

Both classes have their uses.


From kyrie at uh.cu  Thu May 21 08:50:18 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Thu, 21 May 2009 08:50:18 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <3e7d218e-acf3-404e-a6c0-b2b6e8a76875@y10g2000prc.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com>
	<mailman.472.1242860891.8015.python-list@python.org>
	<a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
	<mailman.478.1242875435.8015.python-list@python.org>
	<3e7d218e-acf3-404e-a6c0-b2b6e8a76875@y10g2000prc.googlegroups.com>
Message-ID: <1242910218.4a154e0a2a0fe@mail.uh.cu>


Quoting Carl Banks <pavlovevidence at gmail.com>:

> I don't have any reply to this post except for the following excerpts:
> 
> On May 20, 8:10?pm, Luis Alberto Zarrabeitia Gomez <ky... at uh.cu>
> wrote:
> > 2- in [almost] every other language, _you_ have to be aware of the
> critical
> > sections when multithreading.
> [snip]
> > That's not what I said. We are not talking about the _language_, but about
> one
> > very specific implementation detail. Not even that, I'm talking about one
> of the
> > reasons presented in favor of that specific implementation detail (while
> > agreeing with the others). 
[...]
> 
> No other languages have nesting by indentation (while still being
> reasonablyt successful)....
> etc
> 
> Comparisons to other languages are useless here.  In many cases Python
> does things differently from most other languages and usually it's
> better off for it.

You seem to have missed that I'm not talking about the language but about a
specific implementation detail of CPython. I thought that my poor choice of
words in that sentence was completely clarified by the paragraphs that followed,
but apparently it wasn't. In my "2-" point, maybe I should've said instead: "in
[almost] every language, INCLUDING (proper) PYTHON, you have to be aware of
critcal sections when multithreading". 

> The fact that other languages do something differently doesn't mean
> that other way's better, in fact it really doesn't mean anything at
> all.

No, it doesn't mean that it's better, and I didn't say it was. But it _does_
show that it is _possible_. For an argument about how hard could be to write
native extensions in there was no GIL, the fact that there are many other
GIL-less platforms[1] where is not painful to write native extensions is a valid
counter-example. And that, in all those languages and platforms (including
python), the only one where I hear that explicit, granular locking is too hard
or whatever[2], is CPython's /native/ extensions, is what I found weird.

Regards,

Luis

[1] Including the python implementations for .net and java.
[2] Really, this is was my question and nothing more. I was not comparing, I was
trying to understand what was that "whatever" that made it so hard for CPython.
And your footnote in the previous message gave me a reasonable explanation.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie

-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From ebonak at hotmail.com  Thu May 21 09:06:39 2009
From: ebonak at hotmail.com (Esmail)
Date: Thu, 21 May 2009 09:06:39 -0400
Subject: Your Favorite Python Book
In-Reply-To: <2dc0c81b0905111635x5a598d8bh74e4f7fa76e20b33@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>	<50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>	<1242078761.3662.1314940065@webmail.messagingengine.com>
	<2dc0c81b0905111635x5a598d8bh74e4f7fa76e20b33@mail.gmail.com>
Message-ID: <gv3jkv$gc1$1@ger.gmane.org>

Shawn Milochik wrote:
> On Mon, May 11, 2009 at 5:52 PM,  <python at bdurham.com> wrote:
>> Sam,
>>
>> In no specific order (I brought them all):
>>
>> Wesley Chun's "Core Python Programming"
>>
>> http://mail.python.org/mailman/listinfo/python-list
>>
> 
> I second the Wesley Chun recommendation wholeheartedly. 

This book keeps getting mentioned, I'll have to check it out.
Perhaps some of you can share what about it you like in
particular.

Thanks,
Esmail



From fasteliteprogrammer at yahoo.com  Thu May 21 09:18:08 2009
From: fasteliteprogrammer at yahoo.com (Craig)
Date: Thu, 21 May 2009 06:18:08 -0700 (PDT)
Subject: python question
Message-ID: <407409.23763.qm@web36503.mail.mud.yahoo.com>


How do i install this.i never seen a python write in c before.


      


From fasteliteprogrammer at yahoo.com  Thu May 21 09:19:23 2009
From: fasteliteprogrammer at yahoo.com (Craig)
Date: Thu, 21 May 2009 06:19:23 -0700 (PDT)
Subject: No subject
Message-ID: <1705.22207.qm@web36507.mail.mud.yahoo.com>


http://downloads.emperorlinux.com/contrib/pyiw
http://downloads.emperorlinux.com/contrib/pywpa


Sorry fro the 2 post.How do i install a python moudles write en in C?


      


From google at mrabarnett.plus.com  Thu May 21 09:29:24 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 14:29:24 +0100
Subject: dbfpy - cannot store new record
In-Reply-To: <4A153A10.1080906@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com>
Message-ID: <4A155734.6050306@mrabarnett.plus.com>

Laszlo Nagy wrote:
> Given this example program:
> 
> import dbfpy
> def dbf_open(tblname):
>    fpath = os.path.join(local.DB_DIR,tblname)
>    f = file(fpath,"ab+")
>    f.seek(0)
>    tbl = dbf.Dbf(f)
>    return tbl
> 
> tbl = dbf_open("partners.dbf")
> rec = tbl.newRecord()
> rec["FIELDNAME1"] = 1
> rec["FIELDNAME2"] = "Somebody"
> rec.store()
> tbl.close()
> 
> I get no exception, no error etc. But the new record is NOT appended to 
> the table. What is wrong here?
> 
I've downloaded dbfpy and experimented with it and I've found that
opening the file with file(fpath,"ab+") causes some extra junk to be
appended to the end of the file when the DBF file is closed. It works
much better (and is simpler!) if you open the DBF file with the
filename:

fpath = os.path.join(local.DB_DIR, "partners.dbf")
tbl = dbf.Dbf(fpath)
rec = tbl.newRecord()
rec["FIELDNAME1"] = 1
rec["FIELDNAME2"] = "Somebody"
rec.store()
tbl.close()


From skip at pobox.com  Thu May 21 09:34:09 2009
From: skip at pobox.com (skip at pobox.com)
Date: Thu, 21 May 2009 08:34:09 -0500 (CDT)
Subject: Generating zipped or gzipped attachment with email package?
Message-ID: <20090521133409.A5F1E1084F58@montanaro.dyndns.org>

I have a script which allows me to generate MIME messages with appropriate
attachments.  It's essentially a lightly modified version of the second
example from this page of the email package docs:

    http://docs.python.org/library/email-examples.html

I want to modify my script to automatically zip or gzip files which exceed
some size threshold.  Doing the zip/gzip dance is no problem.  I'm concerned
about how to specify that properly with the email package.  For example,
consider a large CSV file.  I figure out the MIME type is text/csv.  Now
suppose I gzip the file before attaching it.  How would this code change to
specify the compression where "path" is now compressed?

    if maintype == 'text':
        fp = open(path)
        # Note: we should handle calculating the charset
        msg = MIMEText(fp.read(), _subtype=subtype)
        fp.close()

I guess I'm asking if I can have the Content-Type still be text/csv with
some other MIME header indicating the file is compressed.  If so, how do I
achieve that when attaching the compressed file to the message?

Thanks,

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/
    America's vaunted "free press" notwithstanding, story ideas that expose
    the unseemly side of actual or potential advertisers tend to fall by the
    wayside.  Not quite sure why.  -- Jim Thornton


From sasurve at gmail.com  Thu May 21 09:51:23 2009
From: sasurve at gmail.com (shruti surve)
Date: Thu, 21 May 2009 19:21:23 +0530
Subject: About dictionary in combobox in pygtk
Message-ID: <862e00220905210651t99a4664v390519ed8ab2748b@mail.gmail.com>

hi all,

My data has thousands of entries. I 'd like to feed the combobox with
dictionary.how to use dictionary in combobox?


Regards,
shruti surve
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From j.reid at mail.cryst.bbk.ac.uk  Thu May 21 09:53:40 2009
From: j.reid at mail.cryst.bbk.ac.uk (John Reid)
Date: Thu, 21 May 2009 14:53:40 +0100
Subject: LaTeXing python programs
In-Reply-To: <bdd7618d-53a4-48f8-bd0d-8a218d766c5a@n21g2000vba.googlegroups.com>
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>	<mailman.461.1242845176.8015.python-list@python.org>	<i8udnbmVfdskxYnXnZ2dnUVZ_tBi4p2d@rcn.net>
	<mailman.465.1242853870.8015.python-list@python.org>
	<bdd7618d-53a4-48f8-bd0d-8a218d766c5a@n21g2000vba.googlegroups.com>
Message-ID: <gv3md4$sp8$1@ger.gmane.org>



Edward Grefenstette wrote:
> I'm trying to figure out how to use pygments. Are there any good usage
> examples out there?

The documentation worked for me: http://pygments.org/docs/cmdline/

There is also a LaTeX package to call pygments at latex compilation time 
I forget what that is called though.



From gokhansever at gmail.com  Thu May 21 10:02:27 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Thu, 21 May 2009 09:02:27 -0500
Subject: Your Favorite Python Book
In-Reply-To: <gv3jkv$gc1$1@ger.gmane.org>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>
	<1242078761.3662.1314940065@webmail.messagingengine.com>
	<2dc0c81b0905111635x5a598d8bh74e4f7fa76e20b33@mail.gmail.com>
	<gv3jkv$gc1$1@ger.gmane.org>
Message-ID: <49d6b3500905210702t7aca1310r173e95e6c989e7b@mail.gmail.com>

Hello,

I received an autographed copy of CPP, 2nd Edition after joining to Safari's
"What is Python" webcast. They published the recorded session online as
well. Check
http://www.safaribooksonline.com/Corporate/DownloadAndResources/webcasts.php

As you will see from the lecture, he is a very motivated instructor. Mostly
likely you will want to grab a copy of the book after watching the condensed
Python introduction course.

G?khan


On Thu, May 21, 2009 at 8:06 AM, Esmail <ebonak at hotmail.com> wrote:

> Shawn Milochik wrote:
>
>> On Mon, May 11, 2009 at 5:52 PM,  <python at bdurham.com> wrote:
>>
>>> Sam,
>>>
>>> In no specific order (I brought them all):
>>>
>>> Wesley Chun's "Core Python Programming"
>>>
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>>>
>> I second the Wesley Chun recommendation wholeheartedly.
>>
>
> This book keeps getting mentioned, I'll have to check it out.
> Perhaps some of you can share what about it you like in
> particular.
>
> Thanks,
> Esmail
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From david.lyon at preisshare.net  Thu May 21 10:07:19 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Thu, 21 May 2009 10:07:19 -0400
Subject: dbfpy - cannot store new record
In-Reply-To: <4A153A10.1080906@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com>
Message-ID: <e1679f716165298e37047bf2985e4fde@preisshare.net>


Hi,

Try not opening the file in append mode (no "a+")

Inside the logic, there is already a seek to the end of the file
and the record counters at the start of the file need updating
too.

Regards

David


On Thu, 21 May 2009 13:25:04 +0200, Laszlo Nagy <gandalf at shopzeus.com>
wrote:
> Given this example program:
> 
> import dbfpy
> def dbf_open(tblname):
>     fpath = os.path.join(local.DB_DIR,tblname)
>     f = file(fpath,"ab+")
>     f.seek(0)
>     tbl = dbf.Dbf(f)
>     return tbl
> 
> tbl = dbf_open("partners.dbf")
> rec = tbl.newRecord()
> rec["FIELDNAME1"] = 1
> rec["FIELDNAME2"] = "Somebody"
> rec.store()
> tbl.close()
> 
> I get no exception, no error etc. But the new record is NOT appended to 
> the table. What is wrong here?
> 
> Thanks,
> 
>    Laszlo


From gandalf at shopzeus.com  Thu May 21 10:25:12 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Thu, 21 May 2009 16:25:12 +0200
Subject: dbfpy - cannot store new record
In-Reply-To: <e1679f716165298e37047bf2985e4fde@preisshare.net>
References: <4A153A10.1080906@shopzeus.com>
	<e1679f716165298e37047bf2985e4fde@preisshare.net>
Message-ID: <4A156448.9060902@shopzeus.com>

David Lyon ?rta:
> Hi,
>
> Try not opening the file in append mode (no "a+")
>
> Inside the logic, there is already a seek to the end of the file
> and the record counters at the start of the file need updating
> too.
>   
The first thing I tried is to use a filename instead of the file object 
but it didn't work. Then I just tried "r+b" and it worked fine. Thank you!

BTW here is ist constructor:

    def __init__(self, f, readOnly=False, new=False, ignoreErrors=False):
        """Initialize instance.

        Arguments:
            f:
                Filename or file-like object.
            new:
                True if new data table must be created. Assume
                data table exists if this argument is False.
            readOnly:
                if ``f`` argument is a string file will
                be opend in read-only mode; in other cases
                this argument is ignored. This argument is ignored
                even if ``new`` argument is True.
            headerObj:
                `header.DbfHeader` instance or None. If this argument
                is None, new empty header will be used with the
                all fields set by default.
            ignoreErrors:
                if set, failing field value conversion will return
                ``INVALID_VALUE`` instead of raising conversion error.

        """
        if isinstance(f, basestring):
            # a filename
            self.name = f
            if new:
                # new table (table file must be
                # created or opened and truncated)
                self.stream = file(f, "w+b")
            else:
                # tabe file must exist
                self.stream = file(f, ("r+b", "rb")[bool(readOnly)])
        else:
            # a stream
            self.name = getattr(f, "name", "")
            self.stream = f


I have never seen such a construct before. Index a tuple with a boolean???

                self.stream = file(f, ("r+b", "rb")[bool(readOnly)])
Best,

   Laszlo



From gert.cuykens at gmail.com  Thu May 21 10:47:24 2009
From: gert.cuykens at gmail.com (gert)
Date: Thu, 21 May 2009 07:47:24 -0700 (PDT)
Subject: join two selects
Message-ID: <bcf86768-d0e0-4f67-a391-f0dbacba074a@h23g2000vbc.googlegroups.com>

I am trying to figure out how to join two selects ?

SELECT * FROM search
SELECT eid, SUM(pnt) AS total_votes FROM vote

CREATE TABLE votes (
    eid  INTEGER PRIMARY KEY,
    uid  VARCHAR(64),
    pnt  INETEGER DEFAULT 0,
);

CREATE TABLE search (
    eid  INTEGER PRIMARY KEY,
    txt  VARCHAR(64),
    end  DATETIME
);

so the result would be a table that looks like this

["eid", "txt", "end", "total_votes"]


From mail at timgolden.me.uk  Thu May 21 10:54:22 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 21 May 2009 15:54:22 +0100
Subject: join two selects
In-Reply-To: <bcf86768-d0e0-4f67-a391-f0dbacba074a@h23g2000vbc.googlegroups.com>
References: <bcf86768-d0e0-4f67-a391-f0dbacba074a@h23g2000vbc.googlegroups.com>
Message-ID: <4A156B1E.9050708@timgolden.me.uk>

gert wrote:
> I am trying to figure out how to join two selects ?
> 
> SELECT * FROM search
> SELECT eid, SUM(pnt) AS total_votes FROM vote
> 
> CREATE TABLE votes (
>     eid  INTEGER PRIMARY KEY,
>     uid  VARCHAR(64),
>     pnt  INETEGER DEFAULT 0,
> );
> 
> CREATE TABLE search (
>     eid  INTEGER PRIMARY KEY,
>     txt  VARCHAR(64),
>     end  DATETIME
> );
> 
> so the result would be a table that looks like this
> 
> ["eid", "txt", "end", "total_votes"]

That's what's known technically as a join:

SELECT
  sea.eid,
  sea.txt,
  sea.end,
  SUM (vot.pnt) AS total_votes
FROM
  search AS sea
JOIN votes AS vot ON
  vot.eid = sea.eid
GROUP BY
  sea.eid,
  sea.txt,
  sea.end,


(Guessing the join condition from the column names)

TJG


From google at mrabarnett.plus.com  Thu May 21 11:00:34 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 16:00:34 +0100
Subject: dbfpy - cannot store new record
In-Reply-To: <4A156448.9060902@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com>	<e1679f716165298e37047bf2985e4fde@preisshare.net>
	<4A156448.9060902@shopzeus.com>
Message-ID: <4A156C92.7040904@mrabarnett.plus.com>

Laszlo Nagy wrote:
[snip]
> 
> I have never seen such a construct before. Index a tuple with a boolean???
> 
>                self.stream = file(f, ("r+b", "rb")[bool(readOnly)])
> 
Python originally didn't have Boolean; it used 0 for false and 1 for
true. When the Boolean class was added it was subclassed from int in
order not to break existing code, so False and True can be used like 0
and 1 respectively:

 >>> False == 0
True
 >>> True == 1
True
 >>> False + 1
1
 >>> True + 1
2

Therefore a_list[False] is the same as a_list[0] and a_list[True] is the
same as a_list[1].


From lie.1296 at gmail.com  Thu May 21 11:08:57 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 21 May 2009 15:08:57 GMT
Subject: Performance java vs. python
In-Reply-To: <ViaRl.95042$Ku5.64377@newsfe10.ams2>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>
	<gv1nor$10uu$1@adenine.netfront.net>
	<Xns9C1262ED6DA67duncanbooth@127.0.0.1>
	<ViaRl.95042$Ku5.64377@newsfe10.ams2>
Message-ID: <d8eRl.12564$y61.1802@news-server.bigpond.net.au>

Sion Arrowsmith wrote:
>> OTOH, I consider it a productive day if I end up with fewer lines of code 
>> than I started with.
> 
> A friend once justified a negative LOC count as being the sign of a
> good day with the following observation:
> 
> Code that doesn't exist contains no bugs.
> Code that doesn't exist takes no time to execute.
> Code that doesn't exist takes up no space.
> Code that doesn't exist doesn't need maintenance.

Why not call a day productive when the UnitTest that passed has 
increased or stayed constant with reduced LOC.

> Once, when faced with a rather hairy problem that client requirements
> dictated a pure Java solution for, I coded up a fully functional
> prototype in Python to get the logic sorted out, and then translated
> it. Even given the optimisations of manual translation, and being
> able to dispose of one portion of the Python which Java supplied the
> functionality for out of the box (thread timeout, I think it was),
> the code grew by 200%. That was a very unproductive day.

Jython ?


From psaffrey at googlemail.com  Thu May 21 11:21:22 2009
From: psaffrey at googlemail.com (psaffrey at googlemail.com)
Date: Thu, 21 May 2009 08:21:22 -0700 (PDT)
Subject: Overlapping region resolution
Message-ID: <444613e9-783e-4cd8-b801-1ea14ff5fb19@x6g2000vbg.googlegroups.com>

This may be an algorithmic question, but I'm trying to code it in
Python, so...

I have a list of pairwise regions, each with an integer start and end
and a float data point. There may be overlaps between the regions. I
want to resolve this into an ordered list with no overlapping
regions.

My initial solution was to sort the list by the start point, and then
compare each adjacent region, clipping any overlapping section in
half. I've attached code at the bottom. Unfortunately, this does not
work well if you have sections that have three or more overlapping
regions.

A more general solution is to work out where all the overlaps are
before I start. Then I can break up the region space based on what
regions overlap each section and take averages of all the datapoints
that are present in a particular section. Devising an algorithm to do
this is making my brain hurt. Any ideas?

Peter


# also validates the data
def clipRanges(regions):
	for i in range(len(regions) - 1):
		thispoint = regions[i]
		nextpoint = regions[i+1]
		assert thispoint[1] > thispoint[0] and	nextpoint[1] > nextpoint[0],
"point read not valid"
		thisend = thispoint[1]
		nextstart = nextpoint[0]
		diff = thisend - nextstart
		# a difference of zero is too close together
		if diff > -1:
			if diff % 2 == 1:
				diff += 1
			correction = diff / 2
			newend = thisend - correction
			newstart = newend + 1
			assert newend > thispoint[0] and nextpoint[1] > newstart, "new
range not valid!"
			newthispoint = (thispoint[0], newend, thispoint[2])
			newnextpoint = (newstart, nextpoint[1], nextpoint[2])
			regions[i] = newthispoint
			regions[i+1] = newnextpoint
	return regions

regions = [ (0,10,2.5), (12,22,3.5), (15,25,1.2), (23, 30,0.01), (27,
37,1.23), (30, 35, 1.45) ]
regions2 = [ (0,10,2.5), (1,11,1.1), (2,12,1.2) ]

# works fine, produces [(0, 10, 2.5), (12, 18, 3.5), (19, 24, 1.2),
(25, 28, 0.01), (29, 33, 1.23), (34, 35, 1.45)]
print clipRanges(regions)
# violates "new range not valid" assertion
print clipRanges(regions2)


From nick at craig-wood.com  Thu May 21 11:29:55 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Thu, 21 May 2009 10:29:55 -0500
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
	<bemdncWkNYTJEo_XnZ2dnUVZ_gZi4p2d@posted.usinternet>
	<pan.2009.05.20.03.29.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <slrnh1asoa.9ev.nick@irishsea.home.craig-wood.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
>  On Tue, 19 May 2009 05:52:04 -0500, Grant Edwards wrote:
> 
> > On 2009-05-19, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>
> > wrote:
> >> On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:
> >>
> >>> Let me clarify what I think par, pmap, pfilter and preduce would mean
> >>> and how they would be implemented.
> >> [...]
> >>
> >> Just for fun, I've implemented a parallel-map function, and done a
> >> couple of tests. Comments, criticism and improvements welcome!
> > 
> > My only comment would be that your "slow function" might not be a very
> > simulation for the general-case, since it uses time.sleep() which
> > releases the GIL:
> 
> 
>  I didn't expect my code to magically overcome fundamental limitations of 
>  the CPython interpreter :)
> 
> 
> 
> >> def f(arg):  # Simulate a slow function.
> >>     time.sleep(0.5)
> >>     return 3*arg-2
> > 
> > Any Python function that isn't calling a library function written in C
> > that releases the GIL won't show any speedup will it?
> 
>  Not necessarily. Here's another function, that uses a loop instead of 
>  sleep.
> 
>  def g(arg, SIZE=8*10**6):
>      # Default SIZE is chosen so that on my machine, the loop 
>      # takes approximately 0.5 second.
>      for x in xrange(SIZE):
>          pass
>      return 3*arg-2
> 
> 
> >>> setup = 'from __main__ import pmap, g; data = range(50)'
> >>> min(Timer('map(g, data)', setup).repeat(repeat=5, number=3))
>  65.093590974807739
> >>> min(Timer('pmap(g, data)', setup).repeat(repeat=5, number=3))
>  20.268381118774414

I don't think that can be right - that shows python working without
the GIL contention.  So unless you ran it under IronPython?

Here is what happens when I run it under CPython 2.5 on my dual core
laptop.  I made SIZE=10**6 because I got bored of waiting ;-)

map
9.85280895233
pmap
28.4256689548

So the pmap took nearly 3 times as long.  I expect this is because the
task was divided into 5 sections each competing madly for the GIL.

I ran the same script under the latest jython beta which was very
interesting! pmap showing a slight improvement, and faster than
cPython!

$ jython2.5rc2/jython pmap.py
map
6.242000103
pmap
5.88800001144

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From Ron.Barak at lsi.com  Thu May 21 11:42:41 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Thu, 21 May 2009 16:42:41 +0100
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <mailman.1830.1242879003.8014.python-list@python.org>
References: <mailman.1830.1242879003.8014.python-list@python.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>

Hi,

I need to read the end of a 20 MB gzip archives (To extract the date from the last line of a a gzipped log file).
The solution I have below takes noticeable time to reach the end of the gzip archive.

Does anyone have a faster solution to read the last line of a gzip archive ?

Thanks,
Ron.

#!/usr/bin/env python

import gzip

path = "./a/20/mb/file.tgz"

in_file = gzip.open(path, "r")
first_line = in_file.readline()
print "first_line ==",first_line
in_file.seek(-500)
last_line = in_file.readlines()[-1]
print "last_line ==",last_line



-------------- next part --------------
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From Lacrima.Maxim at gmail.com  Thu May 21 11:52:00 2009
From: Lacrima.Maxim at gmail.com (Lacrima)
Date: Thu, 21 May 2009 08:52:00 -0700 (PDT)
Subject: Simple question about accessing instance properties.
Message-ID: <e9e7b903-6d4f-4762-93c2-1bf5148588d8@z9g2000yqi.googlegroups.com>

Hello!

I think I have a very simple question, but I can't understand how to
access object properties in a way described below.
For example I have an instance of any class:

>>> class Person:
	def __init__(self):
		self.name = 'John'
		self.email = 'john at example.com'
		self.phone = '3453454'
>>> person = Person()

Then I have a list of person's properties represented as strings:
>>> prop_list = ['name', 'email', 'phone']

And my question is how to access person's properties using prop_list?
Do I have to somehow convert 'name', 'email', 'phone'?

With regards,
Max.


From gandalf at shopzeus.com  Thu May 21 11:53:38 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Thu, 21 May 2009 17:53:38 +0200
Subject: dbfpy - cannot store new record
In-Reply-To: <4A153A10.1080906@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com>
Message-ID: <4A157902.9080507@shopzeus.com>

Here is the next problem. For boolean/logical fields, I can set their 
value to True/False easily. However, setting NULL seems impossible:

rec = tbl.newRecord()
rec["SOMEFIELD1"] = True # Works fine
rec["SOMEFIELD2"] = False # Works fine
rec["SOMEFIELD3"] = None # Will store False
rec["SOMEFIELD3"] = 0 # Will store False
rec["SOMEFIELD3"] = "" # Will store False
rec["SOMEFIELD3"] = chr(32) # Will store False
rec["SOMEFIELD3"] = chr(0) # Will store False
rec.store()

Strange thing: if I do not set the value of a numeric field, it becomes 
NULL. The same thing I cannot do for logical fields: if I do not set the 
value of a logical field, it becomes an invalid value, denoted with a 
question mark.

Any ideas?

Thanks,

   Laszlo



From google at mrabarnett.plus.com  Thu May 21 11:54:47 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 16:54:47 +0100
Subject: Overlapping region resolution
In-Reply-To: <444613e9-783e-4cd8-b801-1ea14ff5fb19@x6g2000vbg.googlegroups.com>
References: <444613e9-783e-4cd8-b801-1ea14ff5fb19@x6g2000vbg.googlegroups.com>
Message-ID: <4A157947.3020005@mrabarnett.plus.com>

psaffrey at googlemail.com wrote:
> This may be an algorithmic question, but I'm trying to code it in
> Python, so...
> 
> I have a list of pairwise regions, each with an integer start and end
> and a float data point. There may be overlaps between the regions. I
> want to resolve this into an ordered list with no overlapping
> regions.
> 
> My initial solution was to sort the list by the start point, and then
> compare each adjacent region, clipping any overlapping section in
> half. I've attached code at the bottom. Unfortunately, this does not
> work well if you have sections that have three or more overlapping
> regions.
> 
> A more general solution is to work out where all the overlaps are
> before I start. Then I can break up the region space based on what
> regions overlap each section and take averages of all the datapoints
> that are present in a particular section. Devising an algorithm to do
> this is making my brain hurt. Any ideas?
> 
> Peter
> 
> 
> # also validates the data
> def clipRanges(regions):
> 	for i in range(len(regions) - 1):
> 		thispoint = regions[i]
> 		nextpoint = regions[i+1]
> 		assert thispoint[1] > thispoint[0] and	nextpoint[1] > nextpoint[0],
> "point read not valid"
> 		thisend = thispoint[1]
> 		nextstart = nextpoint[0]
> 		diff = thisend - nextstart
> 		# a difference of zero is too close together
> 		if diff > -1:
> 			if diff % 2 == 1:
> 				diff += 1
> 			correction = diff / 2
> 			newend = thisend - correction
> 			newstart = newend + 1
> 			assert newend > thispoint[0] and nextpoint[1] > newstart, "new
> range not valid!"
> 			newthispoint = (thispoint[0], newend, thispoint[2])
> 			newnextpoint = (newstart, nextpoint[1], nextpoint[2])
> 			regions[i] = newthispoint
> 			regions[i+1] = newnextpoint
> 	return regions
> 
> regions = [ (0,10,2.5), (12,22,3.5), (15,25,1.2), (23, 30,0.01), (27,
> 37,1.23), (30, 35, 1.45) ]
> regions2 = [ (0,10,2.5), (1,11,1.1), (2,12,1.2) ]
> 
> # works fine, produces [(0, 10, 2.5), (12, 18, 3.5), (19, 24, 1.2),
> (25, 28, 0.01), (29, 33, 1.23), (34, 35, 1.45)]
> print clipRanges(regions)
> # violates "new range not valid" assertion
> print clipRanges(regions2)

Is the upper bound of a range inclusive or exclusive? If it's exclusive
(like in Python) then it's empty only if lower == upper, and an overlap
occurs only if first.upper > second.lower (and you can have newstart ==
newend in your code).


From google at mrabarnett.plus.com  Thu May 21 12:01:53 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 17:01:53 +0100
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
Message-ID: <4A157AF1.9020104@mrabarnett.plus.com>

Barak, Ron wrote:
> Hi,
>  
> I need to read the end of a 20 MB gzip archives (To extract the date 
> from the last line of a a gzipped log file).
> The solution I have below takes noticeable time to reach the end of the 
> gzip archive.
>  
> Does anyone have a faster solution to read the last line of a gzip archive ?
>  
> Thanks,
> Ron.
>  
> #!/usr/bin/env python
>  
> import gzip
>  
> path = "./a/20/mb/file.tgz"
>  
> in_file = gzip.open(path, "r")
> first_line = in_file.readline()
> print "first_line ==",first_line
> in_file.seek(-500)
> last_line = in_file.readlines()[-1]
> print "last_line ==",last_line
> 
It takes a noticeable time to reach the end because, well, the data is
compressed! The compression method used requires the preceding data to
be read first.


From google at mrabarnett.plus.com  Thu May 21 12:04:53 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 17:04:53 +0100
Subject: Simple question about accessing instance properties.
In-Reply-To: <e9e7b903-6d4f-4762-93c2-1bf5148588d8@z9g2000yqi.googlegroups.com>
References: <e9e7b903-6d4f-4762-93c2-1bf5148588d8@z9g2000yqi.googlegroups.com>
Message-ID: <4A157BA5.5060008@mrabarnett.plus.com>

Lacrima wrote:
> Hello!
> 
> I think I have a very simple question, but I can't understand how to
> access object properties in a way described below.
> For example I have an instance of any class:
> 
>>>> class Person:
> 	def __init__(self):
> 		self.name = 'John'
> 		self.email = 'john at example.com'
> 		self.phone = '3453454'
>>>> person = Person()
> 
> Then I have a list of person's properties represented as strings:
>>>> prop_list = ['name', 'email', 'phone']
> 
> And my question is how to access person's properties using prop_list?
> Do I have to somehow convert 'name', 'email', 'phone'?
> 
 >>> getattr(person, "name")
'John'


From Lacrima.Maxim at gmail.com  Thu May 21 12:14:57 2009
From: Lacrima.Maxim at gmail.com (Lacrima)
Date: Thu, 21 May 2009 09:14:57 -0700 (PDT)
Subject: Simple question about accessing instance properties.
References: <e9e7b903-6d4f-4762-93c2-1bf5148588d8@z9g2000yqi.googlegroups.com>
	<mailman.513.1242921896.8015.python-list@python.org>
Message-ID: <564b6a40-a201-42d7-bc1a-0a6d087b5a67@g19g2000yql.googlegroups.com>

On May 21, 7:04?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Lacrima wrote:
> > Hello!
>
> > I think I have a very simple question, but I can't understand how to
> > access object properties in a way described below.
> > For example I have an instance of any class:
>
> >>>> class Person:
> > ? ?def __init__(self):
> > ? ? ? ? ? ?self.name = 'John'
> > ? ? ? ? ? ?self.email = 'j... at example.com'
> > ? ? ? ? ? ?self.phone = '3453454'
> >>>> person = Person()
>
> > Then I have a list of person's properties represented as strings:
> >>>> prop_list = ['name', 'email', 'phone']
>
> > And my question is how to access person's properties using prop_list?
> > Do I have to somehow convert 'name', 'email', 'phone'?
>
> ?>>> getattr(person, "name")
> 'John'

Hi!
Thanks a lot!!!
That's so simple!

With regards,
Max.


From google at mrabarnett.plus.com  Thu May 21 12:19:25 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 17:19:25 +0100
Subject: dbfpy - cannot store new record
In-Reply-To: <4A157902.9080507@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com> <4A157902.9080507@shopzeus.com>
Message-ID: <4A157F0D.9070400@mrabarnett.plus.com>

Laszlo Nagy wrote:
> Here is the next problem. For boolean/logical fields, I can set their 
> value to True/False easily. However, setting NULL seems impossible:
> 
> rec = tbl.newRecord()
> rec["SOMEFIELD1"] = True # Works fine
> rec["SOMEFIELD2"] = False # Works fine
> rec["SOMEFIELD3"] = None # Will store False
> rec["SOMEFIELD3"] = 0 # Will store False
> rec["SOMEFIELD3"] = "" # Will store False
> rec["SOMEFIELD3"] = chr(32) # Will store False
> rec["SOMEFIELD3"] = chr(0) # Will store False
> rec.store()
> 
> Strange thing: if I do not set the value of a numeric field, it becomes 
> NULL. The same thing I cannot do for logical fields: if I do not set the 
> value of a logical field, it becomes an invalid value, denoted with a 
> question mark.
> 
Have you tried -1?

Can you read a DBF file created by the application (dBase, or whatever)
and see what it uses?


From norseman at hughes.net  Thu May 21 12:45:21 2009
From: norseman at hughes.net (norseman)
Date: Thu, 21 May 2009 09:45:21 -0700
Subject: popen - reading strings - constructing a list from the strings
In-Reply-To: <4A144E67.3050003@mrabarnett.plus.com>
References: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>	<fe9846b90905201053l25fe0ebt47907de64a80eb88@mail.gmail.com>
	<4A144E67.3050003@mrabarnett.plus.com>
Message-ID: <4A158521.2030703@hughes.net>

MRAB wrote:
> Aytekin Vargun wrote:
>> First of all,
>> Thanks for the suggestions, MRAB and norseman. "split()" was what I 
>> was looking for. Now I have a follow up question. In my application I 
>> create radio buttons in a frame. These radio buttons are constructed 
>> whenever a button is clicked. Therefore the list of items are 
>> dynamically changing.
>>
>> What I want to do is to remove the current radio buttons and then 
>> recreate a new set of radio buttons using a new string list. I could 
>> not see a command for deleting or removing a set of radio buttons. I 
>> use Tkinter.
>>
>> I can provide more details.
>> Thanks a lot.
>>
>> PS: I apologize if this creates a new thread. I am new to the list.
>> Aytekin
>>
> I have no idea whether this is possible. I'd just create a new frame. I
> hope you're not trying to add and remove buttons on a dialog while it's
> open; having a dialog radically change its appearance while the user is
> watching would, IMHO, be very bad! :-)
==========================
"... be very bad.." NOPE.
When it's done right, it's quite an eye catcher.

Actually I use that very technique to great advantage.

             (excerpts from non-existent "How to Build a Control Panel")
Leave space for the changing frame in the root or topwindow.
define a frame to fit that space.
define the groups of buttons (static or dynamic) with each using the
   above frame as their home.  (many to one relation)
   put each button group in a def ...() of it's own.
   call the appropriate as needed


example:
             (to call the button(s))
if condition.....
  DispSubI()
else:
  DispSubNB()  #

where:
            (the content changing frame)
  def SubClas():
     try:
       frameSub.destroy()
     except:
       pass
     frameSub =   define your
     .             disposable frame
     .              template here
     label.pack()
     return frameSub


            (the buttons)
----------------------------------------------------------
   #
   #                           I - IDLE
   def DispSubI():
     frameSub= SubClas()
     I_SUB = [
       (" 1", "Land not cropped this and/or last season"),
       (" 2", "New lands being prepared for crop production"),
     ]
     #
     # ---------------------- BUTTONS
     #
     SubI= []
     for mode, text in I_SUB:
       c = Radiobutton(frameSub, text=text, indicatoron=0,
             variable=SubVal, value=mode, command=getSub)
       SubI.append(c)
       c.pack()
   #
   #
   # ----------------------------------------------------------
   #
   #                     NB - BARREN AND WASTELAND
   def DispSubNB():
     frameSub= SubClas()
     NB_SUB = [
       ("**", "None"),
       (" 1", "Dry stream channels"),
       (" 2", "Mine Tailing"),
       (" 3", "Barren land"),
       (" 4", "Salt flats"),
       (" 5", "Sand dunes"),
     ]
     #
     # ---------------------- BUTTONS
     #
     SubNB= []
     for mode, text in NB_SUB:
       c = Radiobutton(frameSub, text=text, indicatoron=0,
             variable=SubVal, value=mode, command=getSub)
       SubNB.append(c)
       c.pack()
   #
   #
   # ----------------------------------------------------------


SubWho can be a volatile list - change before calling buttons.


Simplicity itself.



Today is: 20090521
portions are from actual code
Python 2.5.2 and included Tkinter
Linux Slackware 10.2  (same source runs on Win XP PRO)

Steve


From sion at viridian.paintbox  Thu May 21 12:56:40 2009
From: sion at viridian.paintbox (Sion Arrowsmith)
Date: Thu, 21 May 2009 16:56:40 GMT
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<Xns9C1262ED6DA67duncanbooth@127.0.0.1>
	<ViaRl.95042$Ku5.64377@newsfe10.ams2>
	<d8eRl.12564$y61.1802@news-server.bigpond.net.au>
Message-ID: <cJfRl.168476$aj5.161473@newsfe16.ams2>

Lie Ryan  <lie.1296 at gmail.com> wrote:
>Sion Arrowsmith wrote:
>> Once, when faced with a rather hairy problem that client requirements
>> dictated a pure Java solution for, I coded up a fully functional
>> prototype in Python to get the logic sorted out, and then translated
>> it. [And it wasn't pleasant.]
>
>Jython ?

This was back during Jython's wilderness years (barely maintained at
2.1 while the rest of us were on 2.3, or something like that. Mind
you, you could argue it's four versions behind at the moment.) Plus, I
was the only Python-head in the company just then. Plus, I meant that
"client requirements dictated a pure Java solution": they required the
ability to do a code audit. It's amazing the number and variety of
people who've drunk the Java Kool-Aid.

-- 
\S

   under construction



From ebonak at hotmail.com  Thu May 21 14:05:49 2009
From: ebonak at hotmail.com (Esmail)
Date: Thu, 21 May 2009 14:05:49 -0400
Subject: Your Favorite Python Book
In-Reply-To: <49d6b3500905210702t7aca1310r173e95e6c989e7b@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>	<50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>	<1242078761.3662.1314940065@webmail.messagingengine.com>	<2dc0c81b0905111635x5a598d8bh74e4f7fa76e20b33@mail.gmail.com>	<gv3jkv$gc1$1@ger.gmane.org>
	<49d6b3500905210702t7aca1310r173e95e6c989e7b@mail.gmail.com>
Message-ID: <4A1597FD.1010007@hotmail.com>

G?khan SEVER wrote:
> Hello,
> 
> I received an autographed copy of CPP, 2nd Edition after joining to 
> Safari's "What is Python" webcast. They published the recorded session 
> online as well. Check  
> http://www.safaribooksonline.com/Corporate/DownloadAndResources/webcasts.php
> 
> As you will see from the lecture, he is a very motivated instructor. 
> Mostly likely you will want to grab a copy of the book after watching 
> the condensed Python introduction course.
> 

Hi G?khan

This looks interesting .. I have access to Safari books, but for some
reason I can't access this webcast via it .. so perhaps I have to sign
up for a trial membership for this? I'd prefer to do this w/o .. so I
guess I'll poke around a bit more. Thanks for the lead,

Esmail



From mohammed.abosalim at gmail.com  Thu May 21 14:11:47 2009
From: mohammed.abosalim at gmail.com (abosalim)
Date: Thu, 21 May 2009 11:11:47 -0700 (PDT)
Subject: SpellChecker
References: <e48864a4-1d8c-4239-8a8d-f19b85bd51ee@f16g2000vbf.googlegroups.com>
	<mailman.434.1242812253.8015.python-list@python.org>
Message-ID: <65d92f68-3aed-44ba-9f32-e270829edf1a@l12g2000yqo.googlegroups.com>

On May 20, 12:37?pm, Mike Kazantsev <mike_kazant... at fraggod.net>
wrote:
> abosalim wrote:
> > I used this code.It works fine,but on word not whole text.I want to
> > extend this code to correct
> > text file not only a word,but i don't know.If you have any help,please
> > inform me.
> ...
> > def correct(word):
> > ? ? candidates = known([word]) or known(edits1(word)) or known_edits2
> > (word) or [word]
> > ? ? return max(candidates, key=lambda w: NWORDS[w])
>
> Here I assume that "word" is any string consisting of letters, feel free
> to add your own check in place of str.isalpha, like word length or case.
> Note that simple ops like concatenation work much faster with buffers
> than str / unicode.
>
> ? text = 'some text to correct (anything, really)'
> ? result = buffer('')
>
> ? word, c = buffer(''), ''
> ? for c in text:
> ? ? if c.isalpha(): word += c
> ? ? else:
> ? ? ? if word:
> ? ? ? ? result += correct(word)
> ? ? ? ? word = buffer('')
> ? ? ? result += c
>
> --
> Mike Kazantsev // fraggod.net
>
> ?signature.asc
> < 1KViewDownload
Thanks a lot


From gabriel.hasbun at gmail.com  Thu May 21 14:14:25 2009
From: gabriel.hasbun at gmail.com (Gasto)
Date: Thu, 21 May 2009 11:14:25 -0700 (PDT)
Subject: What do you think of ShowMeDo
References: <b6671f88-bc04-42eb-aad1-5b212bcab1ef@z23g2000prd.googlegroups.com>
	<87tz48s7hm.fsf@benfinney.id.au>
	<52d28fba-ebf7-4bfb-b568-64304da650d5@w31g2000prd.googlegroups.com>
	<pan.2009.04.29.06.27.10@REMOVE.THIS.cybersource.com.au>
Message-ID: <6d0e35d3-e2b7-42bc-a5fc-3338d639470a@g19g2000vbi.googlegroups.com>

Smart ass talking.

Why don't you do a thing then. Following an analogy of what you write.

Put youself in Kyran's and Ian's shoes.

*
You create a website to help people learn open source software and
open source programming. You start off with a few dozen of videos.

People start coming to the site. There are expenses to be dealt with
so a Club membership is created to deal with the expenses of site
maintenance and server bandwith, etc. You create a bunch of Python
videos, you suggest other authors to contribute, the site gets crowded
with good and free ('free' as in free to draw a gun and shoot at your
legs) and informative tutorial videos. That site gets praises by
appreciative people. The site gets a major update and server change.

Unappreciative people start writing stupid feedback in Usenet
comp.lang.python . You address the reasons why ShowMeDo has its faults
(like any other site), namely one man for the whole site. Idiots keep
complaining about the UI being 'unreachable' (while the more adequate
term would be 'improvable')
*

I guess that if you had created something, purely under philanthropic
purpose, you'd understand at first glance. But what could be expected
from a sewer rat that suggests to pay 10ths of thousands of dollars of
UI experts on a philanthropic site?

Go sell your *ss for that price, if you are so capitalism hungry. And
contemplate appreciative people get smarter from ShowMeDo while your
at it.

On Apr 29, 12:27?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Tue, 28 Apr 2009 21:56:08 -0700, kyran wrote:
> > I stumbled across this thread while typing a speculative 'showmedo' in
> > google, as you do while taking a break on a (very) late Tuesday evening.
> > To declare my interest, as things stand I amShowmedoCEO, CTO,
> > boywhomakesthetea etc.. I'm not going to plug anything specific and
> > normally let these things go but it's comp.lang.python and a
> > misconception is a misconception. Besides which, every now and then an
> > attitude really grates.
>
> Yeah, it really sucks when you spend time and effort to build something,
> and then discover that it isn't what people want.
>
> Or at least some people.
>
> [...]
>
> > As for the author immediately above, I think he fails his own test of
> > prudence. There are rather blindingly obvious download links below each
> > video.
>
> Perhaps you should forget your preconceptions and take a long, hard look
> at the site with the eyes of a first time visitor.
>
> As a first time visitor, this is what I see:
>
> * A bunch of "stuff" all over the front page. My eye is drawn to a bunch
> of thumbnails on the right hand side, which look somewhat vaguely what
> I'd see on YouTube. So I click on a thumbnail, expecting to see a video,
> but instead I get taken to a page with no video or download link. I think
> this is what you call a "series", but at first the page just looks broken
> to me -- where's the video?
>
> * Since I'm unusually interested in your site, and have nothing better to
> do, I click on the series heading, and go to another page. This one does
> have a download link, and a broken "click here to play" icon. Oh well,
> I'm used to video sites being broken on everything but IE, or requiring
> Javascript, or both. So I click on the download link, and learn that you
> require a login. Do I care enough about your content to create Yet
> Another Damn Login Identity? No.
>
> (And yet I care enough to spend 20 minutes explaining you how you could
> improve your site. Fancy that. That's because if you improve your site,
> it could be useful to me, but if I create a login account, I've got the
> burden of dealing with yet another login account.)
>
> * Since I'm feeling especially enthusiastic, I go back to the home page,
> and click a link under the "Popular Paths" heading in the "Blog roll".
> (You seem to be using the term blog roll to mean something completely
> different to the way it is used in virtually every blogging site I've
> ever seen.) This takes me to an even more complicated page showing a
> "Path", filled with things that look like clickable buttons but aren't,
> and thumbnails that at first glance look identical. If I spend a couple
> of minutes inspecting them closely and mousing over them, I see that the
> *left* hand side of the thumbnail is the author and the *right* hand side
> is something else.
>
> (No doubt some clever PHP programmer thought he was being clever to come
> up with that UI abomination.)
>
> * I see *one* thumbnail that has a "Click to play" icon next to it. None
> of the others appear to be videos. There is no download link. I give up,
> and decide that your website's UI is too large a barrier for me to bother
> with it any further.
>
> > All that being said, I do feel the need to make that point that we have
> > generated 350 odd completely free video-tutorials for the Python
> > community, including some truly inspirational demonstrations, if the
> > feedback is anything to go by. The site has been refined over time and
> > is at least striving constantly to improve. But some people will always
> > focus only on the negatives. They are few and far between but
> > occasionally, during those long, dark teatimes of the soul, it does make
> > one wonder why one bothers. You provide them with free videos, make no
> > claim upon them and all they do is moan that the format is wrong or
> > their time too precious to waste on a non-mandatory signing- up, though
> > not so precious they can't take time out of their day to whinge about it
> > in a group posting. I think it's the kind of attitude that kills the
> > spirit of FOSS stone-dead.
>
> You think that FOSS is under threat because people are willing to give
> you feedback that your use of non-FOSS software (Flash) is inconvenient
> to them? Oh dear.
>
> For every person who takes the time to write about it, probably one
> hundred people equally dislike your site but just walk away and never
> come back. You should be dancing for joy that Ben gave you valuable
> feedback about his user experience, instead of just walking away. Some
> companies pay tens of thousands of dollars to hire UI consultants to make
> sure their website is usable by first-time visitors, and that's excluding
> development costs. I've just given you twenty minutes of my time writing
> up my experiences for free. Is that enough in the spirit of FOSS for you?
>
> --
> Steven



From norseman at hughes.net  Thu May 21 14:33:41 2009
From: norseman at hughes.net (norseman)
Date: Thu, 21 May 2009 11:33:41 -0700
Subject: reseting an iterator
In-Reply-To: <gv1q69$muh$1@ger.gmane.org>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
	<gv1q69$muh$1@ger.gmane.org>
Message-ID: <4A159E85.1070400@hughes.net>

Terry Reedy wrote:
> Jan wrote:
>> Wouldn't it be easy for Python to implement generating functions so
>> that the iterators they return are equipped with a __reset__() method?
> 
> No.  Such a method would have to poke around in the internals of the 
> __next__ function in implementation specific ways.  The values used to 
> initialize that function might have changed, so 'reset' would have to be 
> carefully defined.
> 
> def squares():
>   start = int(input("enter starting int:"))
>   stop  = int(input("enter stopping int"))
>   for i in range(start,stop):
>     yield i*i
> 
> What does 'reset' mean here?

I don't understand.  Why would one use a reset here in the first place? 
One simply re-runs this.  The output could be collected into a list, 
which one might want to reset, re-list.
bad example?


> 
>> Here is the context of this question.
>>
>> Python documentation defines  a "iterator" as an object ITERATOR
>> having methods __next__() and __iter__() such that the call
>> ITERATOR.__iter__() returns the object itself, 
> 
> This is so that 'iter(iterator) is iterator', 

You would do well to clarify the previous line.
To me it is the same as   a face is a face
function(x) is x      six of one, half dozen of the other
gobble-d-goop, double talk     so what?
Not trying to pick a fight - just pointing out the need for some 
clarity.  Had a math teacher that proclaimed any function(x) that only 
returned x was (hummm can't print that here).  Something like useless.


so that functions can take
> either an interable or iterator as an argument and proceed without 
> checking which it got.

OK.

> 
>> and once a call ITERATOR. __next__() raises StopIteration every
>  >  such subsequent call does the same.
> 

if it can't be restarted (serial line input) then don't, else do.
serial line, ethernet, etc are basically pipes. But a list itself can be 
re-wound, be it a file on disk, something in memory, on tape -- whatever

may have to reach back past the 'pipe' to the 'iterator' there to 
restart but being able to restart (elegantly) restartables is the point.

> After returning objects for some number of calls, which might be unbounded.
> 
> The protocol is basically one method with defined behavior.  It is 
> intentionally minimal so it can be used as the universal within-Python 
> object stream protocol.  Multiple ways of getting interators is in line 
> with this purpose.

I think clarity is also needed here.  Different disciplines will 
interpret the above differently. Stream means river, channel, pipe, 
singular direction to me.  Once the water flows past there is no hope of 
getting those molecules back in same order.  A list of things in a 
container (variable or file) is not a stream and can be rewound. The 
whole concept of random access hinges on this.
To me this boils down to two distinct concepts.
   one being stream as in here it comes there it goes, never to return.
     The stream is not rewindable. The container you put it in might be.
   one being sequential reading of finite number of randomly accessible
     things.  This being inherently rewindable.
Testing which is simple enough and can set the ability to rewind. 
Having it 'built-in' will reduce the problems generated by another 
'do-it-yourself' design by person that may or may not have thought 
things out.  The old - "I took the carburettor off the Olds but it 
doesn't work on my Hugo. Can you help me?" would be avoided.
Really - rewind is better if it is builtin and preforms where it should.
The docs should explain what will or will not happen and why. 
Preferably in plain language. :)



In short: are you telling us the reset() can't do in background the 
exact same thing that the docs tell the users to do?  It's a lot simpler 
to move file descriptors and pointers from the inside.

I often get so close to things I forget to look up too.


> 
> Terry Jan Reedy
> 



From namekuseijin at gmail.com  Thu May 21 14:48:56 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Thu, 21 May 2009 11:48:56 -0700 (PDT)
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com> 
	<0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com> 
	<gv1nor$10uu$1@adenine.netfront.net>
	<Xns9C1262ED6DA67duncanbooth@127.0.0.1> 
	<ViaRl.95042$Ku5.64377@newsfe10.ams2>
Message-ID: <bf9747be-2669-4e2e-9ede-b7738a1eb5a3@o18g2000yqi.googlegroups.com>

On May 21, 7:47?am, s... at viridian.paintbox (Sion Arrowsmith) wrote:
> Duncan Booth ?<duncan.bo... at suttoncourtenay.org.uk> wrote:
>
> >namekuseijin <namekusei... at gmail.com> wrote:
> >> I find it completely unimaginable that people would even think
> >> suggesting the idea that Java is simpler. ?It's one of the most stupidly
> >> verbose and cranky languages out there, to the point you can't really do
> >> anything of relevance without an IDE automatically pumping out lots of
> >> scaffold code for you.
> >But that means Java programmers are obviously more productive than Python
> >programmers: they produce many more lines of code per day even if much of
> >it is boileplate or even automatically generated. Managers like that.
>
> >OTOH, I consider it a productive day if I end up with fewer lines of code
> >than I started with.
>
> A friend once justified a negative LOC count as being the sign of a
> good day with the following observation:
>
> Code that doesn't exist contains no bugs.
> Code that doesn't exist takes no time to execute.
> Code that doesn't exist takes up no space.
> Code that doesn't exist doesn't need maintenance.

Amusing tales.  And very true too -- managers just love LOC and
straightjacket programming environments.

Here's what the father of Unix, Ken Thompson, said once about LOC:
"One of my most productive days was throwing away 1000 lines of code."

http://www.brainyquote.com/quotes/quotes/k/kenthompso254858.html


From davea at ieee.org  Thu May 21 14:54:33 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 21 May 2009 14:54:33 -0400
Subject: making a python program in windows
In-Reply-To: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>
References: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>
Message-ID: <4A15A369.6020600@ieee.org>



Rustom Mody wrote:
> I know how to make a python script behave like a (standalone) program
> in unix --
> 1. put a #! path/to/python as the first line
> 2. make the file executable
>
> The closest I know how to do this in windows is:
> r-click the file in win-explorer
> goto properties
> goto open with
> change pythonw to python
>
> Can someone enlighten me about a more scriptish way of doing this?
> Basically if I have to setup that program on other (windows) m/cs is
> there some .bat or .vbs or some regedit thingy Ive to do to avoid the
> Rt-click routine?
>
>   
Duncan told you about assoc and ftype, two programs that manipulate 
those associations (show and edit).  But one more thing you may want if 
you work much from a command line:

Look at the environment variable PATHEXT.  If it doesn't have a .PY and 
.PYW, you might want to add them.  That way when someone is typing a 
script name at the command prompt, they don't need an extension.


Anyway, now you can see two batch files you could use to make a 
particular version of Python active.  The first one uses assoc and ftype 
to fix the asssociations. And the other changes the environment variable 
PATHEXT to make the extension optional.  Note that changing the 
environment variable is effective only for that DOS box, and its 
children.  If you want a permanent change, you need to change the 
registry, probably at
   hklm\SYSTEM\ControlSet001\Contro/Session\Session 
Manager\Environment\PATHEXT


This can be automated either with a .REG file, or with a few lines of 
Python code that manipulates the registry.  The latter is better, 
because you can avoid disturbing the other extensions that will already 
be there.


You can also manipulate the registry to get SendTo items on the context 
menu for .PY files, and so on.




From davea at ieee.org  Thu May 21 15:06:50 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 21 May 2009 15:06:50 -0400
Subject: A question regd configobj
In-Reply-To: <5ead360a0905210423q526e21ffgad3be1415ac148dd@mail.gmail.com>
References: <5ead360a0905210423q526e21ffgad3be1415ac148dd@mail.gmail.com>
Message-ID: <4A15A64A.6040205@ieee.org>

Srijayanth Sridhar wrote:
> Hello,
>
> I am wondering if it is possible to have hexadecimal strings in a ini file
> and have configobj parse it correctly.
>
> for eg:
> moonwolf at trantor:~/python/config$ cat foo
> foo="\x96\x97"
> .
> .
> .
>   
>>>> a=ConfigObj("foo")
>>>> a
>>>>         
> ConfigObj({'foo': '\\x96\\x97'})
>   
>>>> a['foo']
>>>>         
> '\\x96\\x97'
>
> As you can see the string has escaped the '\' and I want to suppress that
> behavior. I've looked at the documentation and haven't been able to figure
> out if this is an available feature or not.
>
> Any help will be greatly appreciated.
>
> Thank you,
>
> Jayanth
>
>   
When you are using the Python interpreter, the interpreter will escape 
the strings it displays, if you use your present approach.  Try using 
print() to see what the string really contains.

Both approaches are useful -- the interpreter tries to show you 
approximately what you'd have to type to create that value.  Print just 
displays the character, allowing them to take whatever action is called 
for on the output device.

 >>> st = "Line 1\nLine 2"
 >>> st
'Line 1\nLine 2'
 >>> print st
Line 1
Line 2
 >>>



From davea at ieee.org  Thu May 21 15:22:08 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 21 May 2009 15:22:08 -0400
Subject: python question
In-Reply-To: <407409.23763.qm@web36503.mail.mud.yahoo.com>
References: <407409.23763.qm@web36503.mail.mud.yahoo.com>
Message-ID: <4A15A9E0.5050901@ieee.org>

Craig wrote:
> How do i install this.i never seen a python write in c before.
>
>
>   
Well, I've never seen a snake program in any language, python or 
otherwise.  And I believe python was named after Monty Python, not the 
snake.  But once it got its name, snake puns abound.

Anyway, why not tell you what you want to install, and on what 
platform?  If it's Python 2.6.2 on MS Windows XP, just download and run 
the msi file.
    On web page:   http://www.python.org/download/, you'd choose Python 
2.6.2 Windows installer 
<http://www.python.org/ftp/python/2.6.2/python-2.6.2.msi>  and it'd give 
you file python-2.6.2.msi





From nick at craig-wood.com  Thu May 21 15:29:55 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Thu, 21 May 2009 14:29:55 -0500
Subject: How to Spawn a process with P_NOWAIT and pass it some data ?
References: <mailman.440.1242823293.8015.python-list@python.org>
Message-ID: <slrnh1b7jo.jfq.nick@irishsea.home.craig-wood.com>

Barak, Ron <Ron.Barak at lsi.com> wrote:
>  This is my first try at IPC in Python, and I would like to ask your help wi=
>  th the following problem:
> 
>  I would like to spawn a process with P_NOWAIT, and pass some data to the ch=
>  ild process.
> 
>  I created two scripts to try IPC (in a blocking way):
> 
>  $ cat subprocess_sender.py
>  #!/usr/bin/env python
> 
>  import subprocess
> 
>  proc = subprocess.Popen(["python", "-u", "subprocess_receiver.py"],
>  stdin=subprocess.PIPE, shell=True)

You don't need shell=True here I wouldn't have thought.  It is a bad
idea in general.

>  proc.communicate(input="this is sent from subprocess_sender.py")[0]
>  proc.stdin.close()
>  and
> 
>  $ cat subprocess_receiver.py
>  #!/usr/bin/env python
> 
>  import sys
> 
>  print sys.stdin.readline()
> 
>  These scripts intercommunicate nicely:
> 
>  $ python -u  subprocess_sender.py
>  this is sent from subprocess_sender.py
[snip]
>  Can anyone suggest what is the correct way to implement P_NOWAIT and still
>  be able to communicate with the child process ?

You've written it already!  subprocess doesn't wait for a processes
until you call the communicate or wait methods.

If you want to communicate with the subprocess but not block waiting
for all of its output then use the file handle proc.stdout, eg

------------------------------------------------------------
import subprocess
proc = subprocess.Popen(["python", "-u", "subprocess_receiver.py"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, bufsize=0)
proc.stdin.write("10\n")
proc.stdin.write("this is sent from subprocess_sender.py\n")
proc.stdin.close()
while True:
    line = proc.stdout.readline()
    if not line:
        break
    print "Received %r" % line
proc.wait()
------------------------------------------------------------
# subprocess_receiver.py

import sys
import time

times = int(sys.stdin.readline())
line = sys.stdin.readline().rstrip()

for x in range(times):
    print "%d: %s" % (x, line)
    time.sleep(1)
------------------------------------------------------------
$ python subprocess_test3.py
Received '0: this is sent from subprocess_sender.py\n'
Received '1: this is sent from subprocess_sender.py\n'
Received '2: this is sent from subprocess_sender.py\n'
Received '3: this is sent from subprocess_sender.py\n'
Received '4: this is sent from subprocess_sender.py\n'
Received '5: this is sent from subprocess_sender.py\n'
Received '6: this is sent from subprocess_sender.py\n'
Received '7: this is sent from subprocess_sender.py\n'
Received '8: this is sent from subprocess_sender.py\n'
Received '9: this is sent from subprocess_sender.py\n'
Received '10: this is sent from subprocess_sender.py\n'
(printed with a 1 second pause between each line)
------------------------------------------------------------

If you want to interact with a subprocess (eg send, receive, send,
receive) then use the pexpect module - buffering in subprocess will
cause you nothing but pain otherwise!

>  (Or, is there a way to create a subprocess.Popen object from what I assume =
>  is the process handle integer ?)

Errr, not as far as I know.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From jorge.vargas at gmail.com  Thu May 21 15:43:42 2009
From: jorge.vargas at gmail.com (Jorge Vargas)
Date: Thu, 21 May 2009 15:43:42 -0400
Subject: How to get path.py ? http://www.jorendorff.com/ is down
Message-ID: <32822fe60905211243o208589e5y236c024fa429b735@mail.gmail.com>

Hello.

Anyone knows what is the problem with this package? apparently the
author's site is down which prevents pip from installing it. I can
download the zip and go from there but It seems most of the docs are
gone with the site.


From kyrie at uh.cu  Thu May 21 15:47:35 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Thu, 21 May 2009 15:47:35 -0400
Subject: How do I install these C modules in python? The tale of the C
	programming snake.
In-Reply-To: <1705.22207.qm@web36507.mail.mud.yahoo.com>
References: <1705.22207.qm@web36507.mail.mud.yahoo.com>
Message-ID: <200905211547.36311.kyrie@uh.cu>


I don't know the answer, but to do you a favour (and increase the visibility), 
I'm replying with a more... explicit subject line.

=== Original message ===

On Thursday 21 May 2009 09:19:23 am Craig wrote:
> http://downloads.emperorlinux.com/contrib/pyiw
> http://downloads.emperorlinux.com/contrib/pywpa
>
>
> Sorry fro the 2 post.How do i install a python moudles write en in C?

=====

[Suggestions for next time: always write a subject relevant to the /specific/ 
question you are asking. Bonus if you can make it interesting. Never leave 
the subject line empty. If you need to correct yourself, reply to your own 
message instead of opening a new thread.]

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From kay at fiber-space.de  Thu May 21 16:10:49 2009
From: kay at fiber-space.de (Kay Schluehr)
Date: Thu, 21 May 2009 13:10:49 -0700 (PDT)
Subject: How to get path.py ? http://www.jorendorff.com/ is down
References: <mailman.521.1242935026.8015.python-list@python.org>
Message-ID: <33e2534d-706f-4cad-8b35-fb9dc22b25ee@l12g2000yqo.googlegroups.com>

On 21 Mai, 21:43, Jorge Vargas <jorge.var... at gmail.com> wrote:
> Hello.
>
> Anyone knows what is the problem with this package? apparently the
> author's site is down which prevents pip from installing it. I can
> download the zip and go from there but It seems most of the docs are
> gone with the site.

The code comments shall be sufficient. It is a single not very complex
module that basically  unifies several stdlib APIs as methods of a
string subclass.


From jorge.vargas at gmail.com  Thu May 21 16:18:25 2009
From: jorge.vargas at gmail.com (Jorge Vargas)
Date: Thu, 21 May 2009 16:18:25 -0400
Subject: How to get path.py ? http://www.jorendorff.com/ is down
In-Reply-To: <32822fe60905211243o208589e5y236c024fa429b735@mail.gmail.com>
References: <32822fe60905211243o208589e5y236c024fa429b735@mail.gmail.com>
Message-ID: <32822fe60905211318u11a29357w14c2abda189abd8b@mail.gmail.com>

On Thu, May 21, 2009 at 3:43 PM, Jorge Vargas <jorge.vargas at gmail.com> wrote:
> Hello.
>
> Anyone knows what is the problem with this package? apparently the
> author's site is down which prevents pip from installing it. I can
> download the zip and go from there but It seems most of the docs are
> gone with the site.
>

For future references

there is a copy here
http://wiki.python.org/moin/PathModule
and the article is on the way back machine
http://web.archive.org/web/20071012022445/http://www.jorendorff.com/articles/python/path/


From terminatorul at gmail.com  Thu May 21 16:26:13 2009
From: terminatorul at gmail.com (Timothy Madden)
Date: Thu, 21 May 2009 23:26:13 +0300
Subject: python3 module for dbus ?
In-Reply-To: <guuojl$l9g$1@panix3.panix.com>
References: <4a1281ef$0$90271$14726298@news.sunsite.dk>
	<guuojl$l9g$1@panix3.panix.com>
Message-ID: <4a15b88c$0$90265$14726298@news.sunsite.dk>

Aahz wrote:
> In article <4a1281ef$0$90271$14726298 at news.sunsite.dk>,
> Timothy Madden  <terminatorul at gmail.com> wrote:
[...]
>> Do you know if I can get dbus bindings for python3 and glib bindings for 
>> python3 ? Or could I use them otherwise (like without the modules) ?
> 
> Sorry, no answers to your questions off-hand, but what's wrong with
> using 2.x?

It is now old and will be replaced by 3.0
And I am starting a new project. I think it would be appropriate to 
start it with the new version of python.

Timothy Madden


From trigfa at googlemail.com  Thu May 21 16:51:56 2009
From: trigfa at googlemail.com (Graham Arden)
Date: Thu, 21 May 2009 13:51:56 -0700 (PDT)
Subject: Slicing an array in groups of eight
Message-ID: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>

A python novice writes.....

Hello,

I'm trying to extract certain frames from a stack of images as part of
a project.  In order to do this I need to produce an array which
consists of a group of eight, then misses the next 8, then selects the
next eight etc.

i.e (0, 1, 2, 3, 4, 5, 6, 7, 16, 17,18, 19,20,21, 22, 23, 32,33,....
etc)

The following code will produce a series of arrays:

a = arange (0,512)
b = [a[i:i + 8] for i in range (0, len(a), 16)]

[array([0, 1, 2, 3, 4, 5, 6, 7]),
 array([16, 17, 18, 19, 20, 21, 22, 23]),
 array([32, 33, 34, 35, 36, 37, 38, 39]),
 array([48, 49, 50, 51, 52, 53, 54, 55]),
 array([64, 65, 66, 67, 68, 69, 70, 71]),
 array([80, 81, 82, 83, 84, 85, 86, 87]),
etc...


unfortunately I can't work out a way of joining then into a single
array.

Alternatively is there a simpler way of producing the array above?

Thanks

Graham.
http://surelythatcantberight.blogspot.com/


From emperorcezar at gmail.com  Thu May 21 16:58:07 2009
From: emperorcezar at gmail.com (emperorcezar)
Date: Thu, 21 May 2009 13:58:07 -0700 (PDT)
Subject: PyXML difficulties
Message-ID: <2e0adac2-b30d-4928-ae07-a3e65400bc9c@j12g2000vbl.googlegroups.com>

I'm new to using the xml libs. I'm trying to create xml pragmatically,
but I'm finding an issue. I have two elements I'm creating using
createElementNS two elements (soap:Envelope and context). Each having
a different namespace. When I print the created xml, the namespace
attribute gets moved from the context element to the envelope element.
Is there a reason for this, and how can I get it to not do that?

Code:
    from xml.dom import implementation
    from xml.dom.ext import PrettyPrint

    namespace = 'http://www.w3.org/2003/05/soap-envelope'

    # create XML DOM document
    doc = implementation.createDocument(None, '', None)

    # create soap envelope element with namespaces
    soapenv = doc.createElementNS(namespace, "soap:Envelope")

    # add soap envelope element
    doc.appendChild(soapenv)

    # create header element
    header = doc.createElementNS(namespace, "soap:Header")

    context = doc.createElementNS("urn:zimbra", "context")

    context.appendChild(doc.createTextNode(' '))

    header.appendChild(context)

    soapenv.appendChild(header)

    PrettyPrint(doc)

What I'm getting as output:

<?xml version='1.0' encoding='UTF-8'?>
<soap:Envelope xmlns='urn:zimbra' xmlns:soap='http://www.w3.org/
2003/05/soap-envelope'>
  <soap:Header>
    <context>
    </context>
  </soap:Header>
</soap:Envelope>

What I would expect
<?xml version='1.0' encoding='UTF-8'?>
<soap:Envelope xmlns:soap='http://www.w3.org/2003/05/soap-envelope'>
  <soap:Header>
    <context xmlns='urn:zimbra'>
    </context>
  </soap:Header>
</soap:Envelope>


From seanm.py at gmail.com  Thu May 21 17:05:25 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Thu, 21 May 2009 14:05:25 -0700 (PDT)
Subject: 4 hundred quadrillonth?
Message-ID: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>

The explaination in my introductory Python book is not very
satisfying, and I am hoping someone can explain the following to me:

>>> 4 / 5.0
0.80000000000000004

4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
It bothers me.


From google at mrabarnett.plus.com  Thu May 21 17:17:04 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 22:17:04 +0100
Subject: 4 hundred quadrillonth?
In-Reply-To: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
Message-ID: <4A15C4D0.8050504@mrabarnett.plus.com>

seanm.py at gmail.com wrote:
> The explaination in my introductory Python book is not very
> satisfying, and I am hoping someone can explain the following to me:
> 
>>>> 4 / 5.0
> 0.80000000000000004
> 
> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> It bothers me.

Read http://docs.python.org/tutorial/floatingpoint.html



From Scott.Daniels at Acm.Org  Thu May 21 17:17:36 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 21 May 2009 14:17:36 -0700
Subject: Overlapping region resolution
In-Reply-To: <444613e9-783e-4cd8-b801-1ea14ff5fb19@x6g2000vbg.googlegroups.com>
References: <444613e9-783e-4cd8-b801-1ea14ff5fb19@x6g2000vbg.googlegroups.com>
Message-ID: <4sGdnautFLE8XojXnZ2dnUVZ_jSdnZ2d@pdx.net>

psaffrey at googlemail.com wrote:
> This may be an algorithmic question, but I'm trying to code it in
> Python, so...
> 
> I have a list of pairwise regions, each with an integer start and end
> and a float data point. There may be overlaps between the regions. I
> want to resolve this into an ordered list with no overlapping
> regions.
> ... (indication of having at least struggled a bit) ...
> Devising an algorithm to do this is making my brain hurt. Any ideas?

I really hope I'm not giving away the key to a homework problem.
One sort key for such lists that I've found fruitful in the past is:
     (start, -end)
Maybe it will prove helpful to you as well.

--Scott David Daniels
Scott.Daniels at Acm.Org


From lists at cheimes.de  Thu May 21 17:36:04 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 21 May 2009 23:36:04 +0200
Subject: 4 hundred quadrillonth?
In-Reply-To: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
Message-ID: <gv4hg4$6c0$1@ger.gmane.org>

seanm.py at gmail.com schrieb:
> The explaination in my introductory Python book is not very
> satisfying, and I am hoping someone can explain the following to me:
> 
>>>> 4 / 5.0
> 0.80000000000000004
> 
> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> It bothers me.

Welcome to IEEE 754 floating point land! :)

Christian



From vlastimil.brom at gmail.com  Thu May 21 17:40:41 2009
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Thu, 21 May 2009 23:40:41 +0200
Subject: Slicing an array in groups of eight
In-Reply-To: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>
References: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>
Message-ID: <9fdb569a0905211440t5c02fed7ma1af9aca2db6918a@mail.gmail.com>

2009/5/21 Graham Arden <trigfa at googlemail.com>:
> A python novice writes.....
>
> Hello,
>
> I'm trying to extract certain frames from a stack of images as part of
> a project. ?In order to do this I need to produce an array which
> consists of a group of eight, then misses the next 8, then selects the
> next eight etc.
>
> i.e (0, 1, 2, 3, 4, 5, 6, 7, 16, 17,18, 19,20,21, 22, 23, 32,33,....
> etc)
>
...>
> Alternatively is there a simpler way of producing the array above?
>
> Thanks
>
> Graham.
>

Hi,
I'm not sure, if I got the requirements for your code completely, but is:
[x for x in range(512) if not (x // 8) % 2]
what you need?

In any case, if you use python lists you should be able to join them
using their extend() or itertools.chain()

###########################

print [x for x in range(512) if not (x // 8) % 2]

nested_lst = [[1,2],[4,5],[6,7,8,9],[10,11,12]]
flattened_list_1 = list(itertools.chain(*nested_lst))
print flattened_list_1

flattened_list_2 = []
for sublist in nested_lst:
    flattened_list_2.extend(sublist)
print flattened_list_2

hth
  vbr


From seanm.py at gmail.com  Thu May 21 17:41:14 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Thu, 21 May 2009 14:41:14 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
Message-ID: <8833bdfd-b686-48a3-92b9-398084702017@p4g2000vba.googlegroups.com>

On May 21, 5:36?pm, Christian Heimes <li... at cheimes.de> wrote:
> seanm... at gmail.com schrieb:
>
> > The explaination in my introductory Python book is not very
> > satisfying, and I am hoping someone can explain the following to me:
>
> >>>> 4 / 5.0
> > 0.80000000000000004
>
> > 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> > It bothers me.
>
> Welcome to IEEE 754 floating point land! :)
>
> Christian

Thanks for the link and the welcome. Now onward to Bitwise
Operations....

Sean


From bjruth at gmail.com  Thu May 21 17:42:24 2009
From: bjruth at gmail.com (byron)
Date: Thu, 21 May 2009 14:42:24 -0700 (PDT)
Subject: lxml: traverse xml tree and retrieve element based on an attribute
Message-ID: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>

I am using the lxml.etree library to validate an xml instance file
with a specified schema that contains the data types of each element.
This is some of the internals of a function that extracts the
elements:

        schema_doc = etree.parse(schema_fn)
        schema = etree.XMLSchema(schema_doc)

        context = etree.iterparse(xml_fn, events=('start', 'end'),
schema=schema)

        # get root
        event, root = context.next()

        for event, elem in context:
            if event == 'end' and elem.tag == self.tag:
                yield elem
            root.clear()

I retrieve a list of elements from this... and do further processing
to represent them in different ways. I need to be able to capture the
data type from the schema definition for each field in the element.
i.e.

    <xsd:element name="concept">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element ref="foo"/>
                <xsd:element name="concept_id" type="xsd:string"/>
                <xsd:element name="line" type="xsd:integer"/>
                <xsd:element name="concept_value" type="xsd:string"/>
                <xsd:element ref="some_date"/>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>

My thought is to recursively traverse through the schema definition
match the `name` attribute since they are unique to a `type` and
return that element. But I can't seem to make it quite work. All the
xml is valid, validation works, etc. This is what I have:

    def find_node(tree, name):
        for c in tree:
            if c.attrib.get('name') == name:
                return c
            if len(c) > 0:
                return find_node(c, name)
    return 0

I may have been staring at this too long, but when something is
returned... it should be returned completely, no? This is what occurs
with `return find_node(c, name) if it returns 0. `return c` works
(used pdb to verify that), but the recursion continues and ends up
returning 0.

Thoughts and/or a different approach are welcome. Thanks


From gabrycir at gmail.com  Thu May 21 17:48:33 2009
From: gabrycir at gmail.com (TerabyteST)
Date: Thu, 21 May 2009 14:48:33 -0700 (PDT)
Subject: ffmpeg and python big problem
Message-ID: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>

Hello. I am trying to make a video from images shot by my webcam in
python. I use a module I found on the net (here
http://osdir.com/ml/python.matplotlib.general/2005-10/msg00145.html )
but, even if I think I am doing everything correctly, what I only get
is a grey video with some multi-color squares on the top-left bit... I
don't think it's a problem with ffmpeg because I tried with two
different versions. Not even with the codec: i tried wmv, mpg, avi and
everything, but still the same result. And also, my webcam does the
capture right because if I check the image it's OK. Last thing left,
IMO, is the module, but I can't seem to find whats the problem... Is
it because the module was (maybe) made on Linux and I'm working on
windows? If you would help me I'd be so glad!
This program is for my friend and he needs it ready preety quick.

Thank you!


From pavlovevidence at gmail.com  Thu May 21 17:53:38 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 21 May 2009 14:53:38 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
Message-ID: <3bcc27a7-3298-4310-8f61-b3a783e675b4@o30g2000vbc.googlegroups.com>

On May 21, 2:05?pm, seanm... at gmail.com wrote:
> The explaination in my introductory Python book is not very
> satisfying, and I am hoping someone can explain the following to me:
>
> >>> 4 / 5.0
>
> 0.80000000000000004
>
> 4 / 5.0 is 0.8. No more, no less.

That would depend on how you define the numbers and division.

What you say is correct for real numbers and field division.  It's not
true for the types of numbers Python uses, which are not real numbers.

Python numbers are floating point numbers, defined (approximately) by
IEEE 754, and they behave similar to but not exactly the same as real
numbers.  There will always be small round-off errors, and there is
nothing you can do about it except to understand it.


> It bothers me.

Oh well.

You can try Rational numbers if you want, I think they were added in
Python 2.6.  But if you're not careful the divisors can get
ridiculously large.


Carl Banks


From kochhar.mw at gmail.com  Thu May 21 17:55:23 2009
From: kochhar.mw at gmail.com (shailesh)
Date: Thu, 21 May 2009 14:55:23 -0700 (PDT)
Subject: Wrapping methods of built-in dict
References: <c60e66f1-0bb0-45e6-951f-c8909df7ea11@w35g2000prg.googlegroups.com>
	<pan.2009.05.21.02.31.28@REMOVE.THIS.cybersource.com.au>
Message-ID: <6f21d89b-755d-40b8-a42b-0510e5580f93@g22g2000pra.googlegroups.com>

On May 20, 7:31?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Wed, 20 May 2009 18:42:38 -0700, shailesh wrote:
> > The reason as far as I understand is that the methods on the built-in
> > dict are not of MethodType or FunctionType
>
> That seems to be true:
>
> >>> type({}.get)
> <type 'builtin_function_or_method'>
>
>>> type(dict.get>
> <type 'method_descriptor'>
>
> > so they are not included in
> > the result of the inspect.getmembers call and are not wrapped.
>
> But that isn't:
>
> >>> zip(*inspect.getmembers(dict))[0] ?# extract the names only
>
> ('__class__', '__cmp__', '__contains__', '__delattr__', '__delitem__',
> '__doc__', '__eq__', '__ge__', '__getattribute__', '__getitem__',
> '__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__',
> '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__',
> '__setattr__', '__setitem__', '__str__', 'clear', 'copy', 'fromkeys',
> 'get', 'has_key', 'items', 'iteritems', 'iterkeys', 'itervalues', 'keys',
> 'pop', 'popitem', 'setdefault', 'update', 'values')
>
> So the problem isn't directly with getmembers, but with the predicate
> functions you have passed to it (inspect.isfunction and inspect.method).
> Try inspect.ismethoddescriptor instead.

Thanks for that. Between ismethod, isfunction, ismethoddescriptor and
isbuiltin I think I can cover all the types needed for wrapping
classes.

I began writing an equivalent version for wrapping objects instead of
classes. The problem I run into is that there isn't a predicate for
some methods of dict instances

>>> all = set([ name for (name, method) in inspect.getmembers({}) ])    # get all the methods
>>> builtin = set([ name for (name, method) in inspect.getmembers({}, inspect.isbuiltin) ])  # get the builtin methods
>>> for m in all.difference(builtin):    # print the types of what's left over
...     print m, type(getattr({}, m))
...
__ne__ <type 'method-wrapper'>
__setattr__ <type 'method-wrapper'>
__hash__ <type 'NoneType'>
__delitem__ <type 'method-wrapper'>
__str__ <type 'method-wrapper'>
__getattribute__ <type 'method-wrapper'>
__class__ <type 'type'>
__cmp__ <type 'method-wrapper'>
__delattr__ <type 'method-wrapper'>
__iter__ <type 'method-wrapper'>
__le__ <type 'method-wrapper'>
__len__ <type 'method-wrapper'>
__gt__ <type 'method-wrapper'>
__setitem__ <type 'method-wrapper'>
__lt__ <type 'method-wrapper'>
__ge__ <type 'method-wrapper'>
__eq__ <type 'method-wrapper'>
__doc__ <type 'str'>
__init__ <type 'method-wrapper'>
__repr__ <type 'method-wrapper'>

>>> [ attr for attr in dir(inspect) if attr.startswith('is') ]   # list of predicates supported by inspect
['isabstract', 'isbuiltin', 'isclass', 'iscode', 'isdatadescriptor',
'isframe', 'isfunction', 'isgenerator', 'isgeneratorfunction',
'isgetsetdescriptor', 'ismemberdescriptor', 'ismethod',
'ismethoddescriptor', 'ismodule', 'isroutine', 'istraceback']

>>> inspect.getmembers({}, inspect.ismethod)
[]
>>> inspect.getmembers({}, inspect.isfunction)
[]
>>> inspect.getmembers({}, inspect.ismemthoddescriptor)
[]

There doesn't seem to be a predicate returning method wrappers. Is
there an alternate way to query an object for attributes that are of
method wrappers?

This exercise also makes me question if I'm going about this
correctly. If I want to add functionality to the methods of a class or
an object are decorators and the inspect module the pythonic way to go
about it? I can think of alternative implementations either through
metaclasses or proxy objects.

Thanks again.


From emile at fenx.com  Thu May 21 18:02:18 2009
From: emile at fenx.com (Emile van Sebille)
Date: Thu, 21 May 2009 15:02:18 -0700
Subject: Slicing an array in groups of eight
In-Reply-To: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>
References: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>
Message-ID: <gv4itl$ae5$1@ger.gmane.org>

On 5/21/2009 1:51 PM Graham Arden said...
> A python novice writes.....
> 
> Hello,
> 
> I'm trying to extract certain frames from a stack of images as part of
> a project.  In order to do this I need to produce an array which
> consists of a group of eight, then misses the next 8, then selects the
> next eight etc.
> 
> i.e (0, 1, 2, 3, 4, 5, 6, 7, 16, 17,18, 19,20,21, 22, 23, 32,33,....
> etc)
> 
> The following code will produce a series of arrays:
> 
> a = arange (0,512)

> b = [a[i:i + 8] for i in range (0, len(a), 16)]

How about...

 >>> a = range(0,512)
 >>> b = []
 >>> [b.extend(a[i:i + 8]) for i in range (0, len(a), 16)]
 >>> b
[0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 23, 32,
...
497, 498, 499, 500, 501, 502, 503]
 >>>

Emile



From david.lyon at preisshare.net  Thu May 21 18:05:29 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Thu, 21 May 2009 18:05:29 -0400
Subject: dbfpy - cannot store new record
In-Reply-To: <4A157902.9080507@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com> <4A157902.9080507@shopzeus.com>
Message-ID: <84d1f2dab8a4e869306dee81e2605c93@preisshare.net>


well, dbfpy isn't super sophisticated.

If you make your own code fixes, maybe you can provide them
back to the package author.


On Thu, 21 May 2009 17:53:38 +0200, Laszlo Nagy <gandalf at shopzeus.com>
wrote:
> Here is the next problem. For boolean/logical fields, I can set their 
> value to True/False easily. However, setting NULL seems impossible:
> 
> rec = tbl.newRecord()
> rec["SOMEFIELD1"] = True # Works fine
> rec["SOMEFIELD2"] = False # Works fine
> rec["SOMEFIELD3"] = None # Will store False
> rec["SOMEFIELD3"] = 0 # Will store False
> rec["SOMEFIELD3"] = "" # Will store False
> rec["SOMEFIELD3"] = chr(32) # Will store False
> rec["SOMEFIELD3"] = chr(0) # Will store False
> rec.store()
> 
> Strange thing: if I do not set the value of a numeric field, it becomes 
> NULL. The same thing I cannot do for logical fields: if I do not set the 
> value of a logical field, it becomes an invalid value, denoted with a 
> question mark.
> 
> Any ideas?
> 
> Thanks,
> 
>    Laszlo


From paul at boddie.org.uk  Thu May 21 18:06:45 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Thu, 21 May 2009 15:06:45 -0700 (PDT)
Subject: PyXML difficulties
References: <2e0adac2-b30d-4928-ae07-a3e65400bc9c@j12g2000vbl.googlegroups.com>
Message-ID: <5c474572-8a5e-4f2a-9fbc-5da285633482@d14g2000yql.googlegroups.com>

On 21 Mai, 22:58, emperorcezar <emperorce... at gmail.com> wrote:
> I'm new to using the xml libs. I'm trying to create xml pragmatically,
> but I'm finding an issue. I have two elements I'm creating using
> createElementNS two elements (soap:Envelope and context). Each having
> a different namespace. When I print the created xml, the namespace
> attribute gets moved from the context element to the envelope element.
> Is there a reason for this, and how can I get it to not do that?

Having the default namespace declared on an ancestor of the context
element is completely valid in this case, since the soap:Envelope
element is associated with a different namespace. You could see what
happens if you serialise the document using a different library
function or document/node method, however.

> Code:
> ? ? from xml.dom import implementation
> ? ? from xml.dom.ext import PrettyPrint
>
> ? ? namespace = 'http://www.w3.org/2003/05/soap-envelope'
>
> ? ? # create XML DOM document
> ? ? doc = implementation.createDocument(None, '', None)

[...]

Note that according to the specifications, the element name should be
None (null) for this kind of createDocument invocation. See here for
details:

http://www.w3.org/TR/DOM-Level-3-Core/core.html#Level-2-Core-DOM-createDocument

Paul


From emile at fenx.com  Thu May 21 18:11:16 2009
From: emile at fenx.com (Emile van Sebille)
Date: Thu, 21 May 2009 15:11:16 -0700
Subject: ffmpeg and python big problem
In-Reply-To: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>
References: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>
Message-ID: <gv4jef$cfk$1@ger.gmane.org>

On 5/21/2009 2:48 PM TerabyteST said...
> Hello. I am trying to make a video from images shot by my webcam in
> python. I use a module I found on the net (here
> http://osdir.com/ml/python.matplotlib.general/2005-10/msg00145.html )
> but, even if I think I am doing everything correctly, what I only get
> is a grey video with some multi-color squares on the top-left bit... I
> don't think it's a problem with ffmpeg because I tried with two
> different versions. Not even with the codec: i tried wmv, mpg, avi and
> everything, but still the same result. And also, my webcam does the
> capture right because if I check the image it's OK. Last thing left,
> IMO, is the module, but I can't seem to find whats the problem... Is
> it because the module was (maybe) made on Linux and I'm working on
> windows? If you would help me I'd be so glad!
> This program is for my friend and he needs it ready preety quick.

Why not use mencoder directly?  Last time I did this I used Python to 
organize the shots and mencoder to create the video...

Emile



From robert.kern at gmail.com  Thu May 21 18:14:23 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 21 May 2009 17:14:23 -0500
Subject: Slicing an array in groups of eight
In-Reply-To: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>
References: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>
Message-ID: <gv4jnv$d2o$1@ger.gmane.org>

On 2009-05-21 15:51, Graham Arden wrote:
> A python novice writes.....
>
> Hello,
>
> I'm trying to extract certain frames from a stack of images as part of
> a project.  In order to do this I need to produce an array which
> consists of a group of eight, then misses the next 8, then selects the
> next eight etc.
>
> i.e (0, 1, 2, 3, 4, 5, 6, 7, 16, 17,18, 19,20,21, 22, 23, 32,33,....
> etc)
>
> The following code will produce a series of arrays:
>
> a = arange (0,512)
> b = [a[i:i + 8] for i in range (0, len(a), 16)]
>
> [array([0, 1, 2, 3, 4, 5, 6, 7]),
>   array([16, 17, 18, 19, 20, 21, 22, 23]),
>   array([32, 33, 34, 35, 36, 37, 38, 39]),
>   array([48, 49, 50, 51, 52, 53, 54, 55]),
>   array([64, 65, 66, 67, 68, 69, 70, 71]),
>   array([80, 81, 82, 83, 84, 85, 86, 87]),
> etc...
>
>
> unfortunately I can't work out a way of joining then into a single
> array.
>
> Alternatively is there a simpler way of producing the array above?

b = a.reshape((-1, 8))

You will want to ask numpy questions on the numpy mailing list:

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From apt.shansen at gmail.com  Thu May 21 18:16:43 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 21 May 2009 15:16:43 -0700
Subject: python3 module for dbus ?
In-Reply-To: <4a15b88c$0$90265$14726298@news.sunsite.dk>
References: <4a1281ef$0$90271$14726298@news.sunsite.dk>
	<guuojl$l9g$1@panix3.panix.com> 
	<4a15b88c$0$90265$14726298@news.sunsite.dk>
Message-ID: <7a9c25c20905211516q4edbb8fbt7e800a8736a8aa1d@mail.gmail.com>

>
>
>  Do you know if I can get dbus bindings for python3 and glib bindings for
>>> python3 ? Or could I use them otherwise (like without the modules) ?
>>>
>>
>> Sorry, no answers to your questions off-hand, but what's wrong with
>> using 2.x?
>>
>
> It is now old and will be replaced by 3.0
> And I am starting a new project. I think it would be appropriate to start
> it with the new version of python.
>

That's really a premature position to take. 2.x is going to continue to be
developed in tandem with 3.0. They're going to release a 2.7, for example.
It's going to take some non-trivial time for there to be all the big
bindings and third party libraries to even start to be ported over.

In particular, I doubt anything on your list would anyitme soon. I know
wxPython isn't even close from what I've read; I've not heard anything of
any of the PostgreSQL libraries doing it but they might be starting or have
made progress already...

Really. Using 2.x is not developing for a dead-end platform. Yeah you should
code in such a way that its as upwards-compatible to 3.x as possible for a
new project, but... 2.6 is not "old", nor deprecated, nor obsolete... and
2.7 will be out Eventually.

--S
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From tjreedy at udel.edu  Thu May 21 18:21:37 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 21 May 2009 18:21:37 -0400
Subject: reseting an iterator
In-Reply-To: <4A159E85.1070400@hughes.net>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>	<gv1q69$muh$1@ger.gmane.org>
	<4A159E85.1070400@hughes.net>
Message-ID: <gv4k5i$emh$1@ger.gmane.org>

I will clarify by starting over with current definitions.

Ob is an iterator iff next(ob) either returns an object or raises 
StopIteration and continues to raise StopIteration on subsequent calls.

Ob is an iterable iff iter(ob) raturns an iterator.

It is intentional that the protocol definitions be minimal, so that they 
can used as widely as possible.

As a convenience, the definition of iterators is given a slight 
complication.  They are defined as a subcategory of iterables, with the 
  requirement that iter(iterator) be that same iterator.  This means 
that iterators need the following boilerplate:
   def __iter__(self): return self
The extra burden is slight since most iterators are based on builtins or 
generator functions or expressions, which add the boilerplate 
automatically.  The convenience is that one may write

def f(iterable_or_iterator):
   it = iter(iterable_or_iterator)
   ...

instead of

def f(iterable_or_iterator):
   if is_iterable(iterable_or_iterator):
     it = iter(iterable_or_iterator)
   else:
     it = iterable_or_iterator

In particular, the internal function that implements for loops can do 
the former.

In other words, a small bit of boilerplate added to iterators, mostly 
automatically, saves boilerplate in the use of iterators and iterables.

When the protocols were defined, there was discussion about whether or 
not to require 'continue to raise StopIteration'.  For instance, an 
iterator that returns objects derived from external input might not have 
any new external input now but expect to get some in the future.  It was 
decided the such iterators should either wait and block the thread or 
return a 'Not now' indicator such as None.  StopIteration should 
consistently mean 'Done, over and out' so for loops, for instance, would 
know to exit.

The OP proposes that StopIteraton should instead mean 'Done until 
reset', without defining 'reset'.  Some comments:
* This would complicate the protocol.
* There are real use cases, and reiterability is a real issue.  But ...
* Depending on the meaning, resetting may or may not be possible.
* When it is possible, it can potentially be done today with a .send() 
method.
* Many use cases are easier with a new iterator.  For instance

for i in iterable: block1()
for i in iterable: block2()

is easier to write than

it = iter(iterable)
for i in it: block1()
it.reset()
for i in it: block2()

with little relative time saving in the second case, for practical 
problems, to compensate for the extra boilerplate.

Terry Jan Reedy



From clp2 at rebertia.com  Thu May 21 18:36:07 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 21 May 2009 15:36:07 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <3bcc27a7-3298-4310-8f61-b3a783e675b4@o30g2000vbc.googlegroups.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<3bcc27a7-3298-4310-8f61-b3a783e675b4@o30g2000vbc.googlegroups.com>
Message-ID: <50697b2c0905211536u79cd8a02tb74e6cb0981a0a3f@mail.gmail.com>

On Thu, May 21, 2009 at 2:53 PM, Carl Banks <pavlovevidence at gmail.com> wrote:
> On May 21, 2:05?pm, seanm... at gmail.com wrote:
>> The explaination in my introductory Python book is not very
>> satisfying, and I am hoping someone can explain the following to me:
>>
>> >>> 4 / 5.0
>>
>> 0.80000000000000004
>>
>> 4 / 5.0 is 0.8. No more, no less.
>
> That would depend on how you define the numbers and division.
>
> What you say is correct for real numbers and field division. ?It's not
> true for the types of numbers Python uses, which are not real numbers.
>
> Python numbers are floating point numbers, defined (approximately) by
> IEEE 754, and they behave similar to but not exactly the same as real
> numbers. ?There will always be small round-off errors, and there is
> nothing you can do about it except to understand it.
>
>
>> It bothers me.
>
> Oh well.
>
> You can try Rational numbers if you want, I think they were added in
> Python 2.6. ?But if you're not careful the divisors can get
> ridiculously large.

The `decimal` module's Decimal type is also an option to consider:

Python 2.6.2 (r262:71600, May 14 2009, 16:34:51)
>>> from decimal import Decimal
>>> Decimal(4)/Decimal(5)
Decimal('0.8')

Cheers,
Chris
-- 
http://blog.rebertia.com


From clp2 at rebertia.com  Thu May 21 18:36:43 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 21 May 2009 15:36:43 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <3bcc27a7-3298-4310-8f61-b3a783e675b4@o30g2000vbc.googlegroups.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<3bcc27a7-3298-4310-8f61-b3a783e675b4@o30g2000vbc.googlegroups.com>
Message-ID: <50697b2c0905211536i52e79a62u7681999b49544f91@mail.gmail.com>

On Thu, May 21, 2009 at 2:53 PM, Carl Banks <pavlovevidence at gmail.com> wrote:
> On May 21, 2:05?pm, seanm... at gmail.com wrote:
>> The explaination in my introductory Python book is not very
>> satisfying, and I am hoping someone can explain the following to me:
>>
>> >>> 4 / 5.0
>>
>> 0.80000000000000004
>>
>> 4 / 5.0 is 0.8. No more, no less.
>
> That would depend on how you define the numbers and division.
>
> What you say is correct for real numbers and field division. ?It's not
> true for the types of numbers Python uses, which are not real numbers.
>
> Python numbers are floating point numbers, defined (approximately) by
> IEEE 754, and they behave similar to but not exactly the same as real
> numbers. ?There will always be small round-off errors, and there is
> nothing you can do about it except to understand it.
>
>
>> It bothers me.
>
> Oh well.
>
> You can try Rational numbers if you want, I think they were added in
> Python 2.6. ?But if you're not careful the divisors can get
> ridiculously large.

The `decimal` module's Decimal type is also an option to consider:

Python 2.6.2 (r262:71600, May 14 2009, 16:34:51)
>>> from decimal import Decimal
>>> Decimal(4)/Decimal(5)
Decimal('0.8')

Cheers,
Chris
-- 
http://blog.rebertia.com


From norseman at hughes.net  Thu May 21 18:45:57 2009
From: norseman at hughes.net (norseman)
Date: Thu, 21 May 2009 15:45:57 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
Message-ID: <4A15D9A5.4090005@hughes.net>

seanm.py at gmail.com wrote:
> The explaination in my introductory Python book is not very
> satisfying, and I am hoping someone can explain the following to me:
> 
>>>> 4 / 5.0
> 0.80000000000000004
> 
> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> It bothers me.
======================================

Machine architecture, actual implementation of logic on the chip and 
what the compiler maker did all add up to creating rounding errors. I 
have read where python, if left to its own, will output everything it 
computed. I guess the idea is to show
	1) python's accuracy and
	2) what was left over
so the picky people can have something to gnaw on.

Astrophysics, Astronomers and like kind may have wants of such.
If you work much in finite math you may want to test the combo to see if 
  it will allow the accuracy you need. Or do you need to change machines?

Beyond that - just fix the money at 2, gas pumps at 3 and the 
sine/cosine at 8 and let it ride. :)


Steve


From google at mrabarnett.plus.com  Thu May 21 18:57:00 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 23:57:00 +0100
Subject: lxml: traverse xml tree and retrieve element based on an attribute
In-Reply-To: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>
References: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>
Message-ID: <4A15DC3C.2080503@mrabarnett.plus.com>

byron wrote:
> I am using the lxml.etree library to validate an xml instance file
> with a specified schema that contains the data types of each element.
> This is some of the internals of a function that extracts the
> elements:
> 
>         schema_doc = etree.parse(schema_fn)
>         schema = etree.XMLSchema(schema_doc)
> 
>         context = etree.iterparse(xml_fn, events=('start', 'end'),
> schema=schema)
> 
>         # get root
>         event, root = context.next()
> 
>         for event, elem in context:
>             if event == 'end' and elem.tag == self.tag:
>                 yield elem
>             root.clear()
> 
> I retrieve a list of elements from this... and do further processing
> to represent them in different ways. I need to be able to capture the
> data type from the schema definition for each field in the element.
> i.e.
> 
>     <xsd:element name="concept">
>         <xsd:complexType>
>             <xsd:sequence>
>                 <xsd:element ref="foo"/>
>                 <xsd:element name="concept_id" type="xsd:string"/>
>                 <xsd:element name="line" type="xsd:integer"/>
>                 <xsd:element name="concept_value" type="xsd:string"/>
>                 <xsd:element ref="some_date"/>
>             </xsd:sequence>
>         </xsd:complexType>
>     </xsd:element>
> 
> My thought is to recursively traverse through the schema definition
> match the `name` attribute since they are unique to a `type` and
> return that element. But I can't seem to make it quite work. All the
> xml is valid, validation works, etc. This is what I have:
> 
>     def find_node(tree, name):
>         for c in tree:
>             if c.attrib.get('name') == name:
>                 return c
>             if len(c) > 0:
>                 return find_node(c, name)
>     return 0
> 
You're searching the first child and then returning the result, but what
you're looking for might not be in the first child; if it's not then you
need to search the next child:

     def find_node(tree, name):
         for c in tree:
             if c.attrib.get('name') == name:
                 return c
             if len(c) > 0:
                 r = find_node(c, name)
                 if r:
                     return r
         return None

> I may have been staring at this too long, but when something is
> returned... it should be returned completely, no? This is what occurs
> with `return find_node(c, name) if it returns 0. `return c` works
> (used pdb to verify that), but the recursion continues and ends up
> returning 0.
> 
> Thoughts and/or a different approach are welcome. Thanks



From norseman at hughes.net  Thu May 21 19:00:45 2009
From: norseman at hughes.net (norseman)
Date: Thu, 21 May 2009 16:00:45 -0700
Subject: reseting an iterator
In-Reply-To: <gv4k5i$emh$1@ger.gmane.org>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>	<gv1q69$muh$1@ger.gmane.org>	<4A159E85.1070400@hughes.net>
	<gv4k5i$emh$1@ger.gmane.org>
Message-ID: <4A15DD1D.5030005@hughes.net>

Terry Reedy wrote:
> I will clarify by starting over with current definitions.
> 
> Ob is an iterator iff next(ob) either returns an object or raises 
> StopIteration and continues to raise StopIteration on subsequent calls.
> 
> Ob is an iterable iff iter(ob) raturns an iterator.
> 
> It is intentional that the protocol definitions be minimal, so that they 
> can used as widely as possible.
> 
> As a convenience, the definition of iterators is given a slight 
> complication.  They are defined as a subcategory of iterables, with the 
>  requirement that iter(iterator) be that same iterator.  This means that 
> iterators need the following boilerplate:
>   def __iter__(self): return self
> The extra burden is slight since most iterators are based on builtins or 
> generator functions or expressions, which add the boilerplate 
> automatically.  The convenience is that one may write
> 
> def f(iterable_or_iterator):
>   it = iter(iterable_or_iterator)
>   ...
> 
> instead of
> 
> def f(iterable_or_iterator):
>   if is_iterable(iterable_or_iterator):
>     it = iter(iterable_or_iterator)
>   else:
>     it = iterable_or_iterator
> 
> In particular, the internal function that implements for loops can do 
> the former.
> 
> In other words, a small bit of boilerplate added to iterators, mostly 
> automatically, saves boilerplate in the use of iterators and iterables.
> 
> When the protocols were defined, there was discussion about whether or 
> not to require 'continue to raise StopIteration'.  For instance, an 
> iterator that returns objects derived from external input might not have 
> any new external input now but expect to get some in the future.  It was 
> decided the such iterators should either wait and block the thread or 
> return a 'Not now' indicator such as None.  StopIteration should 
> consistently mean 'Done, over and out' so for loops, for instance, would 
> know to exit.
> 
> The OP proposes that StopIteraton should instead mean 'Done until 

Done unless you put the data pointer back to offset zero

> reset', without defining 'reset'.  Some comments:
> * This would complicate the protocol.
> * There are real use cases, and reiterability is a real issue.  But ...
> * Depending on the meaning, resetting may or may not be possible.
> * When it is possible, it can potentially be done today with a .send() 
> method.
> * Many use cases are easier with a new iterator.  For instance
> 
> for i in iterable: block1()
> for i in iterable: block2()
> 
> is easier to write than
> 
> it = iter(iterable)
> for i in it: block1()
> it.reset()
> for i in it: block2()
> 
> with little relative time saving in the second case, for practical 
> problems, to compensate for the extra boilerplate.
> 


while testing:
   for i in it:
     code
   it.reset()



> Terry Jan Reedy
> 



From tjreedy at udel.edu  Thu May 21 19:08:42 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 21 May 2009 19:08:42 -0400
Subject: reseting an iterator
In-Reply-To: <4A15DD1D.5030005@hughes.net>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>	<gv1q69$muh$1@ger.gmane.org>	<4A159E85.1070400@hughes.net>	<gv4k5i$emh$1@ger.gmane.org>
	<4A15DD1D.5030005@hughes.net>
Message-ID: <gv4mtp$kme$1@ger.gmane.org>

norseman wrote:
> Terry Reedy wrote:
>> I will clarify by starting over with current definitions.
>>
>> Ob is an iterator iff next(ob) either returns an object or raises 
>> StopIteration and continues to raise StopIteration on subsequent calls.
>>
>> Ob is an iterable iff iter(ob) raturns an iterator.
>>
>> It is intentional that the protocol definitions be minimal, so that 
>> they can used as widely as possible.
>>
>> As a convenience, the definition of iterators is given a slight 
>> complication.  They are defined as a subcategory of iterables, with 
>> the  requirement that iter(iterator) be that same iterator.  This 
>> means that iterators need the following boilerplate:
>>   def __iter__(self): return self
>> The extra burden is slight since most iterators are based on builtins 
>> or generator functions or expressions, which add the boilerplate 
>> automatically.  The convenience is that one may write
>>
>> def f(iterable_or_iterator):
>>   it = iter(iterable_or_iterator)
>>   ...
>>
>> instead of
>>
>> def f(iterable_or_iterator):
>>   if is_iterable(iterable_or_iterator):
>>     it = iter(iterable_or_iterator)
>>   else:
>>     it = iterable_or_iterator
>>
>> In particular, the internal function that implements for loops can do 
>> the former.
>>
>> In other words, a small bit of boilerplate added to iterators, mostly 
>> automatically, saves boilerplate in the use of iterators and iterables.
>>
>> When the protocols were defined, there was discussion about whether or 
>> not to require 'continue to raise StopIteration'.  For instance, an 
>> iterator that returns objects derived from external input might not 
>> have any new external input now but expect to get some in the future.  
>> It was decided the such iterators should either wait and block the 
>> thread or return a 'Not now' indicator such as None.  StopIteration 
>> should consistently mean 'Done, over and out' so for loops, for 
>> instance, would know to exit.
>>
>> The OP proposes that StopIteraton should instead mean 'Done until 
> 
> Done unless you put the data pointer back to offset zero

And if there is not data pointer?

> 
>> reset', without defining 'reset'.  Some comments:
>> * This would complicate the protocol.
>> * There are real use cases, and reiterability is a real issue.  But ...
>> * Depending on the meaning, resetting may or may not be possible.
>> * When it is possible, it can potentially be done today with a .send() 
>> method.
>> * Many use cases are easier with a new iterator.  For instance
>>
>> for i in iterable: block1()
>> for i in iterable: block2()
>>
>> is easier to write than
>>
>> it = iter(iterable)
>> for i in it: block1()
>> it.reset()
>> for i in it: block2()
>>
>> with little relative time saving in the second case, for practical 
>> problems, to compensate for the extra boilerplate.
>>
> 
> 
> while testing:
>   for i in it:
>     code
>   it.reset()
> 
> 
> 
>> Terry Jan Reedy
>>
> 



From grante at visi.com  Thu May 21 19:09:57 2009
From: grante at visi.com (Grant Edwards)
Date: Thu, 21 May 2009 18:09:57 -0500
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
Message-ID: <r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>

On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
> seanm.py at gmail.com schrieb:
>> The explaination in my introductory Python book is not very
>> satisfying, and I am hoping someone can explain the following to me:
>> 
>>>>> 4 / 5.0
>> 0.80000000000000004
>> 
>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
>> It bothers me.
>
> Welcome to IEEE 754 floating point land! :)

Floating point is sort of like quantum physics: the closer you
look, the messier it gets.

-- 
Grant



From gert.cuykens at gmail.com  Thu May 21 19:17:09 2009
From: gert.cuykens at gmail.com (gert)
Date: Thu, 21 May 2009 16:17:09 -0700 (PDT)
Subject: join two selects
References: <bcf86768-d0e0-4f67-a391-f0dbacba074a@h23g2000vbc.googlegroups.com>
	<mailman.506.1242917636.8015.python-list@python.org>
Message-ID: <7592295f-466e-4aed-a16b-1047c55baa24@e20g2000vbc.googlegroups.com>

On May 21, 4:54?pm, Tim Golden <m... at timgolden.me.uk> wrote:
> gert wrote:
> > I am trying to figure out how to join two selects ?
>
> > SELECT * FROM search
> > SELECT eid, SUM(pnt) AS total_votes FROM vote
>
> > CREATE TABLE votes (
> > ? ? eid ?INTEGER PRIMARY KEY,
> > ? ? uid ?VARCHAR(64),
> > ? ? pnt ?INETEGER DEFAULT 0,
> > );
>
> > CREATE TABLE search (
> > ? ? eid ?INTEGER PRIMARY KEY,
> > ? ? txt ?VARCHAR(64),
> > ? ? end ?DATETIME
> > );
>
> > so the result would be a table that looks like this
>
> > ["eid", "txt", "end", "total_votes"]
>
> That's what's known technically as a join:
>
> SELECT
> ? sea.eid,
> ? sea.txt,
> ? sea.end,
> ? SUM (vot.pnt) AS total_votes
> FROM
> ? search AS sea
> JOIN votes AS vot ON
> ? vot.eid = sea.eid
> GROUP BY
> ? sea.eid,
> ? sea.txt,
> ? sea.end,
>
> (Guessing the join condition from the column names)
>
> TJG

Thanks works great :-)
just needed to at LEFT JOIN and remove sea.txt sea.end from the GROUP
BY


From rhodri at wildebst.demon.co.uk  Thu May 21 19:20:01 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 00:20:01 +0100
Subject: A list with periodic boundary conditions
In-Reply-To: <0f324d00-875a-4d18-bd8b-981997a34e44@q14g2000vbn.googlegroups.com>
References: <0f324d00-875a-4d18-bd8b-981997a34e44@q14g2000vbn.googlegroups.com>
Message-ID: <op.uuay3noza8ncjz@gnudebst>

On Thu, 21 May 2009 13:08:39 +0100, <youhvee at googlemail.com> wrote:

> Hi,
>
> I'm trying to create a new class of list that has periodic boundary
> conditions.
>
> Here's what I have so far:
>
> class wrappedList(list):
>     def __getitem__(self, p):
>         return list.__getitem__(self, p%len(self))
>     def __setitem__(self, p, v):
>         list.__setitem__(self, p%len(self), v)
>
>>>>> a=wrappedList(range(10))
>>>>> a[1]
> 1
>>>>> a[11]
> 1
>
> But I would also like to make slices. For instance I would like
>>>>> a[8:11]
> [8, 9, 0]
>
> I can do it by copying, but I want to return a view to the original
> data, and I have no idea where to start. It seems that the slice needs
> to retain some knowledge of the list from which it derived. i.e. it
> needs to know that it is a slice. Any ideas on how I can extend this
> to allow views?

Reading the docs, this looks like a very messy area of Python 2.x in
that for a builtin like `list` you have to provide a __getslice__ method
despite it being deprecated and only dealing with simple slices.  Good
luck with that.  In Python 3, you just have to deal with the fact that
your __getitem__ and __setitem__ `p` arguments can be slice objects
instead of integers.

If you're set on making your slices views on the original (which means
that changes to the slice will change the original, unlike normal lists!)
then you need to extend your class to remember what it's viewing, and
what the start, stop and step of the slice were.  When it's a view, it
passes (massaged) requests up to its parent.  There's a cute (but likely
inefficient) way of doing this that uses the fact that your view is still
a list under the hood, and stashes the parental indices in it.  This will
also make len() work correctly, for a bonus :-)  It gets quite horrid
quite fast, but here's a very incomplete untested skeleton:

class wrappedList(list):
   def __init__(self, parent=None, *args):
     list.__init__(self, *args)
     self.parent = parent

   def __getitem__(self, p):
     if self.parent is None:
       self.primary_getitem(p)
     else:
       self.view_getitem(p)

   def view_getitem(self, p):
     return self.parent[list.__getitem__(self, p%len(self))]

...and similarly for __setitem__, where primary_getitem() is your
previous __getitem__ method.  All four need to be modified to cope
with slices, of course, and to create new wrappedList objects.
Something like this:

   if isinstance(p, slice):
     if p.start is None:
       start = 0
     else:
       start = p.start
     if p.step is None:
       step = 1
     else:
       step = p.step
     indices = range(start, p.stop, step)
     return wrappedList(indices, parent=self)

This will go horribly, horribly wrong if you delete anything from
your original list, but I can't off-hand think of a view method
that won't.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From norseman at hughes.net  Thu May 21 19:27:07 2009
From: norseman at hughes.net (norseman)
Date: Thu, 21 May 2009 16:27:07 -0700
Subject: finding repeated data sequences in a column
In-Reply-To: <f0c45029-3983-4a84-8f08-2b497594c03e@r34g2000vbi.googlegroups.com>
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
	<c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com>
	<mailman.456.1242841999.8015.python-list@python.org>
	<f0c45029-3983-4a84-8f08-2b497594c03e@r34g2000vbi.googlegroups.com>
Message-ID: <4A15E34B.7050407@hughes.net>

yadin wrote:
> On May 20, 6:53 pm, norseman <norse... at hughes.net> wrote:
>> bearophileH... at lycos.com wrote:
>>> yadin:
>>>> How can I build up a program that tells me that this sequence
>>>> 1000028706
>>>> 1000028707
>>>> 1000028708
>>>> is repeated somewhere in the column, and how can i know where?
>>> Can such patterns nest? That is, can you have a repeated pattern made
>>> of an already seen pattern plus something else?
>>> If you don't want a complex program, then you may need to specify the
>>> problem better.
>>> You may want something like LZ77 or releated (LZ78, etc):
>>> http://en.wikipedia.org/wiki/LZ77
>>> This may have a bug:
>>> http://code.activestate.com/recipes/117226/
>>> Bye,
>>> bearophile
>> ============================================
>> index on column
>> Ndx1 is set to index #1
>> Ndx2 is set to index #2
>> test Ndx1 against Ndx2
>>    if equal write line number and column content to a file
>>            (that's two things on one line:  15 1000028706
>>                                            283 1000028706 )
>>    Ndx1 is set to Ndx2
>>    Ndx2 is set to index #next
>> loop to test    writing out each duplicate set
>>
>> Then use the outfile and index on line number
>>
>> In similar manor, check if line current and next line line numbers are
>> sequential.  If so scan forward to match column content of lower line
>> number and check first matched column's line number and next for
>> sequential.  Print them out if so
>>
>> everything in outfile has 1 or more duplicates
>>
>> 4  aa               |--
>> 5  bb         |--      |      thus 4/5 match 100/101
>> 6  cc            |     |
>> .                |     |
>> 100 aa           |  |--
>> 101 bb         |--
>> 102 ddd
>> 103 cc                  there is a duplicate but not a sequence
>> 200 ff
>>
>> mark duplicate sequences as tested and proceed on through
>>    seq1 may have more than one other seq in file.
>>    the progress is from start to finish without looking back
>>    thus each step forward has fewer lines to test.
>>    marking already knowns eliminates redundant sequence testing.
>>
>> By subseting on pass1 the expensive testing is greatly reduced.
>> If you know your subset data won't exceed memory then the "outfile"
>> can be held in memory to speed things up considerably.
>>
>> Today is: 20090520
>> no code
>>
>> Steve- Hide quoted text -
>>
>> - Show quoted text -
> 
> this is the program...I wrote but is not working
> I have a list of valves, and another of pressures;
> If I am ask to find out which ones are the valves that are using all
> this set of pressures, wanted best pressures
> this is the program i wrote but is not working properly, it suppossed
> to return in the case
> find all the valves that are using pressures 1 "and" 2 "and" 3.
> It returns me A, A2, A35....

looking at the data that seems correct.
there are 3 '1's in the list, 1-A, 1-A2, 1-A35
there are 2 '2's in the list, 2-A, 2-A2
there are 2 '3's in the list, 3-A, 3-A2
and so on

   after the the two sets are paired
indexing on the right yields 1-A,2-A,3-A,1-A2,2-A2,3-A2,7-A4...
indexing on the left  yiels1 1-A,1-A2,1-A35,2-A,2-A2,3-A,3-A2,7-A4...
and the two 78s would pair with a G and with a G2  (78-G, 78-G2)
beyond that I'm a bit lost.

20090521 Steve

> The correct answer supposed to be A and A2...
> if I were asked for pressures 56 and 78 the correct answer supossed to
> be valves G and G2...
> 
> Valves = ['A','A','A','G', 'G', 'G',
> 'C','A2','A2','A2','F','G2','G2','G2','A35','A345','A4'] ##valve names
> pressures = [1,2,3,4235,56,78,12, 1, 2, 3, 445, 45,56,78,1, 23,7] ##
> valve pressures
> result = []
> 
> bestpress = [1,2,3] ##wanted base pressures
> print bestpress,'len bestpress is' , len(bestpress)
> 
> print len(Valves)
> print len(Valves)
> for j in range(len(Valves)):
> #for i in range(len(bestpress)):
>     #for j in range(len(Valves)):
>     for i in range(len(bestpress)-2):
>             if pressures [j]== bestpress[i] and bestpress [i+1]
> ==pressures [j+1] and bestpress [i+2]==pressures [j+2]:
>                 result.append(Valves[j])
>                 #i = i+1
>                 #j = j+1
>             # print i, j, bestpress[i]
>                 print "common PSVs are", result



From sjmachin at lexicon.net  Thu May 21 19:35:17 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 21 May 2009 16:35:17 -0700 (PDT)
Subject: dbfpy - cannot store new record
References: <4A153A10.1080906@shopzeus.com>
	<mailman.510.1242921221.8015.python-list@python.org>
Message-ID: <71b49836-d306-4399-9543-038ca69e9abb@v23g2000pro.googlegroups.com>

On May 22, 1:53?am, Laszlo Nagy <gand... at shopzeus.com> wrote:
> Here is the next problem. For boolean/logical fields, I can set their
> value to True/False easily. However, setting NULL seems impossible:
>
> rec = tbl.newRecord()
> rec["SOMEFIELD1"] = True # Works fine
> rec["SOMEFIELD2"] = False # Works fine
> rec["SOMEFIELD3"] = None # Will store False
> rec["SOMEFIELD3"] = 0 # Will store False
> rec["SOMEFIELD3"] = "" # Will store False
> rec["SOMEFIELD3"] = chr(32) # Will store False
> rec["SOMEFIELD3"] = chr(0) # Will store False
> rec.store()
>
> Strange thing: if I do not set the value of a numeric field, it becomes
> NULL. The same thing I cannot do for logical fields: if I do not set the
> value of a logical field, it becomes an invalid value, denoted with a
> question mark.

That's not "invalid", it *is* "NULL" according to DBF convention.



From rhodri at wildebst.demon.co.uk  Thu May 21 19:46:32 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 00:46:32 +0100
Subject: defaultdict's bug or feature?
In-Reply-To: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
Message-ID: <op.uua0bujla8ncjz@gnudebst>

On Thu, 21 May 2009 13:07:50 +0100, Red Forks <redforks at gmail.com> wrote:

> from collections import defaultdict
>
> d = defaultdict(set)
> assert isinstance(d['a'], set)
> assert isinstance(d.get('b'), set)
>
> d['a'] is ok, and a new set object is insert to d, but d.get('b') won't.
>
> It's a bug, or just a feature?

Feature.  You're blaming 'get' for doing exactly what it said it would,
both in returning None and not gratuitously altering the dictionary.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From pavlovevidence at gmail.com  Thu May 21 19:56:52 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 21 May 2009 16:56:52 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
Message-ID: <ddbcf4c6-132a-4ac8-ac6b-a19febc008c7@j12g2000vbl.googlegroups.com>

On May 21, 3:45?pm, norseman <norse... at hughes.net> wrote:
> Beyond that - just fix the money at 2, gas pumps at 3 and the
> sine/cosine at 8 and let it ride. :)


Or just use print.

>>> print 4.0/5.0
0.8

Since interactive prompt is usually used by programmers who are
inspecting values it makes a little more sense to print enough digits
to give unambiguous representation.


Carl Banks


From google at mrabarnett.plus.com  Thu May 21 20:01:02 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 22 May 2009 01:01:02 +0100
Subject: 4 hundred quadrillonth?
In-Reply-To: <r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.525.1242941777.8015.python-list@python.org>
	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
Message-ID: <4A15EB3E.2000006@mrabarnett.plus.com>

Grant Edwards wrote:
> On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
>> seanm.py at gmail.com schrieb:
>>> The explaination in my introductory Python book is not very
>>> satisfying, and I am hoping someone can explain the following to me:
>>>
>>>>>> 4 / 5.0
>>> 0.80000000000000004
>>>
>>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
>>> It bothers me.
>> Welcome to IEEE 754 floating point land! :)
> 
> Floating point is sort of like quantum physics: the closer you
> look, the messier it gets.
> 
I have the same feeling towards databases.


From bjruth at gmail.com  Thu May 21 20:12:37 2009
From: bjruth at gmail.com (byron)
Date: Thu, 21 May 2009 17:12:37 -0700 (PDT)
Subject: lxml: traverse xml tree and retrieve element based on an 
	attribute
References: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>
	<mailman.536.1242946630.8015.python-list@python.org>
Message-ID: <f93fade3-0aba-48a8-883b-8b67a4f46b48@s12g2000yqi.googlegroups.com>

On May 21, 6:57?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> byron wrote:
> > I am using the lxml.etree library to validate an xml instance file
> > with a specified schema that contains the data types of each element.
> > This is some of the internals of a function that extracts the
> > elements:
>
> > ? ? ? ? schema_doc = etree.parse(schema_fn)
> > ? ? ? ? schema = etree.XMLSchema(schema_doc)
>
> > ? ? ? ? context = etree.iterparse(xml_fn, events=('start', 'end'),
> > schema=schema)
>
> > ? ? ? ? # get root
> > ? ? ? ? event, root = context.next()
>
> > ? ? ? ? for event, elem in context:
> > ? ? ? ? ? ? if event == 'end' and elem.tag == self.tag:
> > ? ? ? ? ? ? ? ? yield elem
> > ? ? ? ? ? ? root.clear()
>
> > I retrieve a list of elements from this... and do further processing
> > to represent them in different ways. I need to be able to capture the
> > data type from the schema definition for each field in the element.
> > i.e.
>
> > ? ? <xsd:element name="concept">
> > ? ? ? ? <xsd:complexType>
> > ? ? ? ? ? ? <xsd:sequence>
> > ? ? ? ? ? ? ? ? <xsd:element ref="foo"/>
> > ? ? ? ? ? ? ? ? <xsd:element name="concept_id" type="xsd:string"/>
> > ? ? ? ? ? ? ? ? <xsd:element name="line" type="xsd:integer"/>
> > ? ? ? ? ? ? ? ? <xsd:element name="concept_value" type="xsd:string"/>
> > ? ? ? ? ? ? ? ? <xsd:element ref="some_date"/>
> > ? ? ? ? ? ? </xsd:sequence>
> > ? ? ? ? </xsd:complexType>
> > ? ? </xsd:element>
>
> > My thought is to recursively traverse through the schema definition
> > match the `name` attribute since they are unique to a `type` and
> > return that element. But I can't seem to make it quite work. All the
> > xml is valid, validation works, etc. This is what I have:
>
> > ? ? def find_node(tree, name):
> > ? ? ? ? for c in tree:
> > ? ? ? ? ? ? if c.attrib.get('name') == name:
> > ? ? ? ? ? ? ? ? return c
> > ? ? ? ? ? ? if len(c) > 0:
> > ? ? ? ? ? ? ? ? return find_node(c, name)
> > ? ? return 0
>
> You're searching the first child and then returning the result, but what
> you're looking for might not be in the first child; if it's not then you
> need to search the next child:
>
> ? ? ?def find_node(tree, name):
> ? ? ? ? ?for c in tree:
> ? ? ? ? ? ? ?if c.attrib.get('name') == name:
> ? ? ? ? ? ? ? ? ?return c
> ? ? ? ? ? ? ?if len(c) > 0:
> ? ? ? ? ? ? ? ? ?r = find_node(c, name)
> ? ? ? ? ? ? ? ? ?if r:
> ? ? ? ? ? ? ? ? ? ? ?return r
> ? ? ? ? ?return None
>
> > I may have been staring at this too long, but when something is
> > returned... it should be returned completely, no? This is what occurs
> > with `return find_node(c, name) if it returns 0. `return c` works
> > (used pdb to verify that), but the recursion continues and ends up
> > returning 0.
>
> > Thoughts and/or a different approach are welcome. Thanks
>
>

Thanks. Yes i tried something like this, but I think I overwrite `c`
when i wrote it, as in:

    if len(c) > 0:
        c = fin_node(c, name)
        if c is not None:
            return c

Thanks for you help.


From notontheweb at noisp.com  Thu May 21 20:19:06 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Thu, 21 May 2009 17:19:06 -0700
Subject: Cursor movement question
Message-ID: <3cmRl.90415$iW4.57403@en-nntp-01.dc1.easynews.com>

Howdy, folks.  I am using wxPython 2.8 on Windoze XP Pro.  I want my 
application to move the cursor and the mouse-point (the coordinates in 
the mouse-click events) to the left when the user presses the left-arrow 
key, up when they press the up-arrow key, etc..  I think I can figure 
out how to grab the arrow key events, but I can't find how to move the 
cursor.  I tried calling wx.SetCursorEvent(x,y), but no joy.

Can you help?

Thankee,
Jive


From gherron at islandtraining.com  Thu May 21 20:19:42 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 21 May 2009 17:19:42 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <4A15EB3E.2000006@mrabarnett.plus.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.525.1242941777.8015.python-list@python.org>	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
	<4A15EB3E.2000006@mrabarnett.plus.com>
Message-ID: <4A15EF9E.8070406@islandtraining.com>

MRAB wrote:
> Grant Edwards wrote:
>> On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
>>> seanm.py at gmail.com schrieb:
>>>> The explaination in my introductory Python book is not very
>>>> satisfying, and I am hoping someone can explain the following to me:
>>>>
>>>>>>> 4 / 5.0
>>>> 0.80000000000000004
>>>>
>>>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
>>>> It bothers me.
>>> Welcome to IEEE 754 floating point land! :)
>>
>> Floating point is sort of like quantum physics: the closer you
>> look, the messier it gets.

+1 as QOTW


And just to add one bit of clarity:  This problem has nothing to do with 
the OP's division of 4 by 5.0, but rather that the value of 0.8 itself 
cannot be represented exactly in IEEE 754.  Just try

 >>> print repr(0.8)  # No division needed
'0.80000000000000004'

Gary Herron





>>
> I have the same feeling towards databases.



From google at mrabarnett.plus.com  Thu May 21 20:27:39 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 22 May 2009 01:27:39 +0100
Subject: lxml: traverse xml tree and retrieve element based on an attribute
In-Reply-To: <f93fade3-0aba-48a8-883b-8b67a4f46b48@s12g2000yqi.googlegroups.com>
References: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>	<mailman.536.1242946630.8015.python-list@python.org>
	<f93fade3-0aba-48a8-883b-8b67a4f46b48@s12g2000yqi.googlegroups.com>
Message-ID: <4A15F17B.3040900@mrabarnett.plus.com>

byron wrote:
[snip]
> 
> Thanks. Yes i tried something like this, but I think I overwrite `c`
> when i wrote it, as in:
> 
>     if len(c) > 0:
>         c = fin_node(c, name)
>         if c is not None:
>             return c
> 
FYI, doing that won't actually matter in this case; 'c' will still be
bound to the next value on the next iteration of the loop because it's
just a reference to the iterator and 'assigning' won't affect the
iterator as in soem other languages.


From rob.clewley at gmail.com  Thu May 21 20:33:25 2009
From: rob.clewley at gmail.com (Rob Clewley)
Date: Thu, 21 May 2009 20:33:25 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <4A15EF9E.8070406@islandtraining.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
	<4A15EB3E.2000006@mrabarnett.plus.com>
	<4A15EF9E.8070406@islandtraining.com>
Message-ID: <a749952d0905211733n5a571e05v8e08f98d1c641521@mail.gmail.com>

On Thu, May 21, 2009 at 8:19 PM, Gary Herron <gherron at islandtraining.com> wrote:
> MRAB wrote:
>>
>> Grant Edwards wrote:
>>>
>>> On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
>>>>
>>>> seanm.py at gmail.com schrieb:
>>>>>
>>>>> The explaination in my introductory Python book is not very
>>>>> satisfying, and I am hoping someone can explain the following to me:
>>>>>
>>>>>>>> 4 / 5.0
>>>>>
>>>>> 0.80000000000000004
>>>>>
>>>>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
>>>>> It bothers me.
>>>>
>>>> Welcome to IEEE 754 floating point land! :)
>>>

FYI you can explore the various possible IEEE-style implementations
with my python simulator of arbitrary floating or fixed precision
numbers:

http://www2.gsu.edu/~matrhc/binary.html


From rhodri at wildebst.demon.co.uk  Thu May 21 20:38:04 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 01:38:04 +0100
Subject: ffmpeg and python big problem
In-Reply-To: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>
References: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>
Message-ID: <op.uua2pqtia8ncjz@gnudebst>

On Thu, 21 May 2009 22:48:33 +0100, TerabyteST <gabrycir at gmail.com> wrote:

> Hello. I am trying to make a video from images shot by my webcam in
> python. I use a module I found on the net (here
> http://osdir.com/ml/python.matplotlib.general/2005-10/msg00145.html )
> but, even if I think I am doing everything correctly, what I only get
> is a grey video with some multi-color squares on the top-left bit...

Obvious starter question: do you have ffmpeg properly compiled for
Windows (i.e. using Cygwin or MinGW)?

> I
> don't think it's a problem with ffmpeg because I tried with two
> different versions.

This is not a guarantee.  ffmpeg is wonderful when it works, and a
total pig when it doesn't.  Sometimes it's big and obvious about
not working and seg-faults on you, and sometimes it just does
something completely implausible with the information you give
it.

> Not even with the codec: i tried wmv, mpg, avi and
> everything, but still the same result.

The output vcodec doesn't matter as much as the input vcodec,
which is mjpeg.  I think webcams are mjpeg devices, but I've
never used one so I'm not sure.

> Last thing left,
> IMO, is the module, but I can't seem to find whats the problem... Is
> it because the module was (maybe) made on Linux and I'm working on
> windows? If you would help me I'd be so glad!

I'm not nearly so worried about the module being written on Linux as
ffmpeg.  The module is full of bad practice, but it doesn't do
anything os-specifically bad.

There is one further thing to check: your code that uses the module.
How do you feed data from the webcam to the VidStream object?  If
you're creating intermediate files of webcam stuff, please say
what they are and how they came to be.

I have to admit, if you've got images from your webcam in a file
already, I don't see why you aren't using ffmpeg directly.

> This program is for my friend and he needs it ready preety quick.

Aha. Ahahahahahahahaha.

Ahem.

Sorry, but "pretty quick" and "ffmeg" don't go together well in
my experience.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From bjruth at gmail.com  Thu May 21 20:41:32 2009
From: bjruth at gmail.com (byron)
Date: Thu, 21 May 2009 17:41:32 -0700 (PDT)
Subject: lxml: traverse xml tree and retrieve element based on an 
	attribute
References: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>
	<mailman.536.1242946630.8015.python-list@python.org>
	<f93fade3-0aba-48a8-883b-8b67a4f46b48@s12g2000yqi.googlegroups.com>
	<mailman.544.1242952060.8015.python-list@python.org>
Message-ID: <fe5e5965-750c-4073-bcc6-994c57dea553@h28g2000yqd.googlegroups.com>

On May 21, 8:27?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> byron wrote:
>
> [snip]
>
> > Thanks. Yes i tried something like this, but I think I overwrite `c`
> > when i wrote it, as in:
>
> > ? ? if len(c) > 0:
> > ? ? ? ? c = fin_node(c, name)
> > ? ? ? ? if c is not None:
> > ? ? ? ? ? ? return c
>
> FYI, doing that won't actually matter in this case; 'c' will still be
> bound to the next value on the next iteration of the loop because it's
> just a reference to the iterator and 'assigning' won't affect the
> iterator as in soem other languages.

Good to know. Thanks.


From redforks at gmail.com  Thu May 21 20:44:37 2009
From: redforks at gmail.com (Red Forks)
Date: Fri, 22 May 2009 08:44:37 +0800
Subject: defaultdict's bug or feature?
In-Reply-To: <op.uua0bujla8ncjz@gnudebst>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
	<op.uua0bujla8ncjz@gnudebst>
Message-ID: <3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>

You mean 'get' method should not alter the dict, does 'dict[key]' should not
alter the dict either?

d = defaultdict(set)
assert len(d) == 0
print d[1]
assert len(d) == 1

auto insert value to dict, when value is not in dict, is what defaultdict
try to do.

On Fri, May 22, 2009 at 7:46 AM, Rhodri James
<rhodri at wildebst.demon.co.uk>wrote:

> On Thu, 21 May 2009 13:07:50 +0100, Red Forks <redforks at gmail.com> wrote:
>
>  from collections import defaultdict
>>
>> d = defaultdict(set)
>> assert isinstance(d['a'], set)
>> assert isinstance(d.get('b'), set)
>>
>> d['a'] is ok, and a new set object is insert to d, but d.get('b') won't.
>>
>> It's a bug, or just a feature?
>>
>
> Feature.  You're blaming 'get' for doing exactly what it said it would,
> both in returning None and not gratuitously altering the dictionary.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From aahz at pythoncraft.com  Thu May 21 20:49:07 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 May 2009 17:49:07 -0700
Subject: Streaming pdf with URLLib
References: <04eacd56-5293-4553-bdb3-ad2e8266c6b0@z7g2000vbh.googlegroups.com>
Message-ID: <gv4sq3$8gj$1@panix3.panix.com>

In article <04eacd56-5293-4553-bdb3-ad2e8266c6b0 at z7g2000vbh.googlegroups.com>,
Scooter  <slbentley at gmail.com> wrote:
>
>#!/usr/bin/python
>
>import urllib
>
>u = urllib.urlopen('https://myinternal.server/pdfs/pdfstreamer.aspx')
>print 'Content-type: application/pdf\n\n'
># print 'Content-type: application/x-msdownload; name=\"FileName\"\n
>\n'
># print 'Content-Dispostion: attachment; filename=\"FileName\"\r\n\n'
>
>pdfdoc = u.read()
>print pdfdoc
>
>Hitting my pdfstreamer.aspx app directly through a browser renders a
>pdf just fine. So now I'm attempting to use this python app on an
>external webserver, access it as a cgi, to pull the pdf, and then re-
>render it, but at that point it just shows me the raw pdf in
>the browser.

What application type does the browser report?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From rdmurray at bitdance.com  Thu May 21 20:50:48 2009
From: rdmurray at bitdance.com (R. David Murray)
Date: Fri, 22 May 2009 00:50:48 +0000 (UTC)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
	<4A15EB3E.2000006@mrabarnett.plus.com>
	<4A15EF9E.8070406@islandtraining.com>
Message-ID: <gv4st8$11t$1@ger.gmane.org>

Gary Herron <gherron at islandtraining.com> wrote:
> MRAB wrote:
> > Grant Edwards wrote:
> >> On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
> >>> seanm.py at gmail.com schrieb:
> >>>> The explaination in my introductory Python book is not very
> >>>> satisfying, and I am hoping someone can explain the following to me:
> >>>>
> >>>>>>> 4 / 5.0
> >>>> 0.80000000000000004
> >>>>
> >>>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> >>>> It bothers me.
> >>> Welcome to IEEE 754 floating point land! :)
> >>
> >> Floating point is sort of like quantum physics: the closer you
> >> look, the messier it gets.
> 
> +1 as QOTW
> 
> And just to add one bit of clarity:  This problem has nothing to do with 
> the OP's division of 4 by 5.0, but rather that the value of 0.8 itself 
> cannot be represented exactly in IEEE 754.  Just try
> 
>  >>> print repr(0.8)  # No division needed
> '0.80000000000000004'

Python 3.1b1+ (py3k:72432, May  7 2009, 13:51:24) 
[GCC 4.1.2 (Gentoo 4.1.2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 4 / 5.0
0.8
>>> print(repr(0.8))
0.8

In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
point algorithm for Python so that the shortest repr that will round
trip correctly is what is used as the floating point repr....

--David



From google at mrabarnett.plus.com  Thu May 21 20:55:00 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 22 May 2009 01:55:00 +0100
Subject: defaultdict's bug or feature?
In-Reply-To: <3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>	<op.uua0bujla8ncjz@gnudebst>
	<3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
Message-ID: <4A15F7E4.2010600@mrabarnett.plus.com>

Red Forks wrote:
> You mean 'get' method should not alter the dict, does 'dict[key]' should 
> not alter the dict either?
> 
> d = defaultdict(set)
> assert len(d) == 0
> print d[1]
> assert len(d) == 1
> 
> auto insert value to dict, when value is not in dict, is what 
> defaultdict try to do.
> 
That's the behaviour which makes defaultdict so useful. Compare using
defaultdict:

     d = defaultdict(int)

and then:

     d["foo"] += 1

to using dict:

     d = {}

and then:

     try:
         d["foo"] += 1
     except KeyError:
         d["foo"] = 1

or:

     d["foo"] = d.get("foo", 0) + 1


From rhodri at wildebst.demon.co.uk  Thu May 21 21:12:38 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 02:12:38 +0100
Subject: Is there a better way to chose a slice of a list?
In-Reply-To: <83650e78-b0e9-4dcb-a0ff-ec369794a1d8@b7g2000pre.googlegroups.com>
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
	<873ab07jpx.fsf@benfinney.id.au>
	<83650e78-b0e9-4dcb-a0ff-ec369794a1d8@b7g2000pre.googlegroups.com>
Message-ID: <op.uua4bcqia8ncjz@gnudebst>

On Wed, 20 May 2009 17:08:08 +0100, walterbyrd <walterbyrd at iname.com>  
wrote:

> I am processing a huge spreadsheet which I have converted to a csv
> format. Each row will be a wiki page with several sub-headings. The
> spreadsheet contains information about servers. Wiki sub-headings may
> include: 'hardware', 'software', 'users', 'network swith settings'.
> 'Hardware' may include the spreadsheet columns: 'memory', 'cpu', and
> so on. So the first six columns in the spreadsheet may go under
> 'hardware' the next six under 'software' and so on.
>
> I have already created the wiki pages, using a method similar to what
> I first posted. But, it seems like there should be a better way to to
> do it. So, for future reference, I was just wondering.

Given that you're already making presumptions about the nature of your
data, named constants or enums are the most concise thing to use together
with a quick check of the column header row to make sure that the
constants really do refer to the right columns.

If you want something a little more bullet-proof, create a dictionary
mapping the column headers (as read in) to column numbers and use that
to generate the slice limits.  Since that still relies on the column
headers being what you expect them to be, and at least partially in the
order you expect them to be, it's probably not enough of a win to bother
with.

Trying to slice a list by value is never going to look pretty because
lists aren't designed to be indexed by value.  Worse, if you were
doing this a lot (as you imply) then it's going to be horribly
inefficient, since you're doing an extra two (or more) O(n) searches
for every row.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gherron at islandtraining.com  Thu May 21 21:30:17 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 21 May 2009 18:30:17 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <gv4st8$11t$1@ger.gmane.org>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.525.1242941777.8015.python-list@python.org>	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>	<4A15EB3E.2000006@mrabarnett.plus.com>	<4A15EF9E.8070406@islandtraining.com>
	<gv4st8$11t$1@ger.gmane.org>
Message-ID: <4A160029.5040204@islandtraining.com>

R. David Murray wrote:
> Gary Herron <gherron at islandtraining.com> wrote:
>   
>> MRAB wrote:
>>     
>>> Grant Edwards wrote:
>>>       
>>>> On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
>>>>         
>>>>> seanm.py at gmail.com schrieb:
>>>>>           
>>>>>> The explaination in my introductory Python book is not very
>>>>>> satisfying, and I am hoping someone can explain the following to me:
>>>>>>
>>>>>>             
>>>>>>>>> 4 / 5.0
>>>>>>>>>                   
>>>>>> 0.80000000000000004
>>>>>>
>>>>>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
>>>>>> It bothers me.
>>>>>>             
>>>>> Welcome to IEEE 754 floating point land! :)
>>>>>           
>>>> Floating point is sort of like quantum physics: the closer you
>>>> look, the messier it gets.
>>>>         
>> +1 as QOTW
>>
>> And just to add one bit of clarity:  This problem has nothing to do with 
>> the OP's division of 4 by 5.0, but rather that the value of 0.8 itself 
>> cannot be represented exactly in IEEE 754.  Just try
>>
>>  >>> print repr(0.8)  # No division needed
>> '0.80000000000000004'
>>     
>
> Python 3.1b1+ (py3k:72432, May  7 2009, 13:51:24) 
> [GCC 4.1.2 (Gentoo 4.1.2)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>   
>>>> 4 / 5.0
>>>>         
> 0.8
>   
>>>> print(repr(0.8))
>>>>         
> 0.8
>
> In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
> point algorithm for Python so that the shortest repr that will round
> trip correctly is what is used as the floating point repr....
>
> --David
>   

Which won't change the fact that 0.8 and lots of other favorite floats 
are still not representable exactly, but it will hide this fact from 
most newbies.  One of the nicer results of this will be that these 
(almost) weekly questions and discussions will be come a thing of the 
past. 

With a sigh of relief,
Gary Herron







From danb_83 at yahoo.com  Thu May 21 21:56:08 2009
From: danb_83 at yahoo.com (AggieDan04)
Date: Thu, 21 May 2009 18:56:08 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
Message-ID: <1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>

On May 21, 5:45?pm, norseman <norse... at hughes.net> wrote:
> seanm... at gmail.com wrote:
> > The explaination in my introductory Python book is not very
> > satisfying, and I am hoping someone can explain the following to me:
>
> >>>> 4 / 5.0
> > 0.80000000000000004
>
> > 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> > It bothers me.
>
> ======================================
>
> Machine architecture, actual implementation of logic on the chip and
> what the compiler maker did all add up to creating rounding errors. I
> have read where python, if left to its own, will output everything it
> computed. I guess the idea is to show
> ? ? ? ? 1) python's accuracy and
> ? ? ? ? 2) what was left over
> so the picky people can have something to gnaw on.

If you want to be picky, the exact value is
0.8000000000000000444089209850062616169452667236328125 (i.e.,
3602879701896397/2**52).  Python's repr function rounds numbers to 17
significant digits.  This is the minimum that ensures that float(repr
(x)) == x for all x (using IEEE 754 double precision).

> Astrophysics, Astronomers and like kind may have wants of such.
> If you work much in finite math you may want to test the combo to see if
> ? it will allow the accuracy you need. Or do you need to change machines?

The error in this example is roughly equivalent to the width of a red
blood cell compared to the distance between Earth and the sun.  There
are very few applications that need more accuracy than that.




From danb_83 at yahoo.com  Thu May 21 22:01:03 2009
From: danb_83 at yahoo.com (AggieDan04)
Date: Thu, 21 May 2009 19:01:03 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<3bcc27a7-3298-4310-8f61-b3a783e675b4@o30g2000vbc.googlegroups.com> 
	<mailman.534.1242945407.8015.python-list@python.org>
Message-ID: <e3e43d5a-3e48-4894-a91b-ffc45089baa4@b34g2000pra.googlegroups.com>

On May 21, 5:36?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, May 21, 2009 at 2:53 PM, Carl Banks <pavlovevide... at gmail.com> wrote:
> > On May 21, 2:05?pm, seanm... at gmail.com wrote:
> >> The explaination in my introductory Python book is not very
> >> satisfying, and I am hoping someone can explain the following to me:
>
> >> >>> 4 / 5.0
>
> >> 0.80000000000000004
>
> >> 4 / 5.0 is 0.8. No more, no less.
...
>
> The `decimal` module's Decimal type is also an option to consider:
>
> Python 2.6.2 (r262:71600, May 14 2009, 16:34:51)
> >>> from decimal import Decimal
> >>> Decimal(4)/Decimal(5)
>
> Decimal('0.8')

>>> Decimal(1) / Decimal(3) * 3
Decimal("0.9999999999999999999999999999")
>>> Decimal(2).sqrt() ** 2
Decimal("1.999999999999999999999999999")

Decimal isn't a panacea for floating-point rounding errors.  It also
has the disadvantage of being much slower.

It is useful for financial applications, in which an exact value for
0.01 actually means something.


From davea at ieee.org  Thu May 21 22:13:45 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 21 May 2009 22:13:45 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <a749952d0905211733n5a571e05v8e08f98d1c641521@mail.gmail.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.525.1242941777.8015.python-list@python.org>	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>	<4A15EB3E.2000006@mrabarnett.plus.com>	<4A15EF9E.8070406@islandtraining.com>
	<a749952d0905211733n5a571e05v8e08f98d1c641521@mail.gmail.com>
Message-ID: <4A160A59.6050008@ieee.org>

Rob Clewley wrote:
> On Thu, May 21, 2009 at 8:19 PM, Gary Herron <gherron at islandtraining.com> wrote:
>   
>> MRAB wrote:
>>     
>>> Grant Edwards wrote:
>>>       
>>>> On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
>>>>         
>>>>> seanm.py at gmail.com schrieb:
>>>>>           
>>>>>> The explaination in my introductory Python book is not very
>>>>>> satisfying, and I am hoping someone can explain the following to me:
>>>>>>
>>>>>>             
>>>>>>>>> 4 / 5.0
>>>>>>>>>                   
>>>>>> 0.80000000000000004
>>>>>>
>>>>>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
>>>>>> It bothers me.
>>>>>>             
>>>>> Welcome to IEEE 754 floating point land! :)
>>>>>           
>
> FYI you can explore the various possible IEEE-style implementations
> with my python simulator of arbitrary floating or fixed precision
> numbers:
>
> http://www2.gsu.edu/~matrhc/binary.html
>
>   

It was over 40 years ago I studied Fortran, with the McCracken book.  
There were big warnings in it about the hazards of binary floating 
point.  This was long before the IEEE
 754, Python, Java, or even C.

In any floating point system with finite precision, there will be some 
numbers that cannot be represented exactly.  Beginning programmers 
assume that if you can write it exactly, the computer should understand 
it exactly as well.  (That's one of the reasons the math package I 
microcoded a few decades ago was base 10).

If you try to write 1/3 in decimal notation, you either have to write 
forever, or truncate it somewhere.  The only fractions that terminate 
are those that have a denominator (in lowest terms) comprised only of 
powers of 2 and 5.  So 4/10 can be represented, and so can 379/625.  Any 
other fraction, like 1/7, or 3/91 will make a repeating decimal, 
sometimes taking many digits to repeat, but not repeating with zeroes.

In binary fractions, the rule is similar, but only for powers of 2.  If 
there's a 5 in there, it cannot be represented exactly.

So people learn to use integers, or rational numbers (fractions), or 
decimal representations, depending on what values they're willing to 
have be approximate.

Something that escapes many people is that even when there's an error 
there, sometimes converting it back to decimal hides the error.  So 0.4 
might have an error on the right end, but 0.7 might happen to look good.

Thanks for providing tools that let people play.

An anecdote from many years ago (1975) -- I had people complain about my 
math package, that cos(pi/2) was not zero.  It was something times 
10**-13, but still not zero.  And they wanted it to be zero.  If 
somebody set the math package to work in degrees, they'd see that 
cos(90) was in fact zero.   Why the discrepancy?  Well,  you can't 
represent pi/2 exactly, (in any floating point or fraction system, it's 
irrational).  So if you had a perfect cos package, but give it a number 
that's off just a little from a right angle, you'd expect the answer to 
be off a little from zero.  Turns out that (in a 13 digit floating point 
package), the value was the next 13 digits of pi/2.  And 12 of them were 
accurate.  I was pleased as punch.




From rhodri at wildebst.demon.co.uk  Thu May 21 22:35:41 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 03:35:41 +0100
Subject: finding repeated data sequences in a column
In-Reply-To: <f0c45029-3983-4a84-8f08-2b497594c03e@r34g2000vbi.googlegroups.com>
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>
	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
	<c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com>
	<mailman.456.1242841999.8015.python-list@python.org>
	<f0c45029-3983-4a84-8f08-2b497594c03e@r34g2000vbi.googlegroups.com>
Message-ID: <op.uua75rova8ncjz@gnudebst>

On Thu, 21 May 2009 08:55:45 +0100, yadin <conra2004 at yahoo.com> wrote:

> this is the program...I wrote but is not working
> I have a list of valves, and another of pressures;
> If I am ask to find out which ones are the valves that are using all
> this set of pressures, wanted best pressures
> this is the program i wrote but is not working properly, it suppossed
> to return in the case
> find all the valves that are using pressures 1 "and" 2 "and" 3.

So if I understand you correctly, you actually want to split your
data up by valve name to find each valve that has listed pressures of
1, 2 and 3 in that order?  That's a lot simpler, though it has to be
said that your data isn't in a terribly convenient format.

> It returns me A, A2, A35....
> The correct answer supposed to be A and A2...
> if I were asked for pressures 56 and 78 the correct answer supossed to
> be valves G and G2...

Ah, so the target "best" pressure sequence doesn't have to be all of the
values listed.  Hmm.  Here goes...

====HERE BE CODE====

 from itertools import izip, groupby

VALVES = ['A','A','A','G', 'G', 'G',
           'C','A2','A2','A2','F','G2',
           'G2','G2','A35','A345','A4'] ##valve names
PRESSURES = [1,2,3,4235,56,78,
              12, 1, 2, 3, 445, 45,
              56,78, 1, 23,7] ## valve pressures
TARGET = [1, 2, 3]

target_len = len(TARGET) # Since we're using this a lot
result = []

for valve, p in groupby(izip(VALVES, PRESSURES),
                         key=lambda x: x[0]):
   pressures = [x[1] for x in p]
   for i in xrange((len(pressures) - target_len) + 1):
     if pressures[i:i+target_len] == TARGET:
       result.append(valve)
       break

print "The answer you want is", result

====HERE ENDETH THE CODE====

Not terribly pretty largely because of having to do sublist
matching, but it should work for most "best pressures".

The unfamiliar looking stuff are functions from the iterator
toolkit that make this a lot simpler.  If you don't get what's
going on here, I don't blame you.  I just deleted my attempt
to explain it because it was confusing me :-)  Reading the
descriptions of izip and groupby in the standard library
documentation should make things clearer.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From walterbyrd at iname.com  Thu May 21 22:42:18 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Thu, 21 May 2009 19:42:18 -0700 (PDT)
Subject: When does the escape character work within raw strings?
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
Message-ID: <3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>

I guess I am confused about when when escape characters are are
interpersonal as escape characters, and escape characters are not
treated as escape characters.

Sometimes escape characters in regular strings are treated as escape
characters, sometimes not. Same seems to go for raw strings. So how do
I know?

IMO: '\' characters in raw strings should not be given any special
meaning. That would also solve the common problem of r'c:\whatever\'
not working in python. But I digress.


To me this does not seem right. r'\n' should not equal '\n'

>>> s = 'x\nx'
>>> a = re.sub('\n', 'x', s)
>>> a
'xxx'
>>> a = re.sub(r'\n', 'x', s)
>>> a
'xxx'
>>>



From notontheweb at noisp.com  Thu May 21 22:58:33 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Thu, 21 May 2009 19:58:33 -0700
Subject: Cursor movement question
In-Reply-To: <3cmRl.90415$iW4.57403@en-nntp-01.dc1.easynews.com>
References: <3cmRl.90415$iW4.57403@en-nntp-01.dc1.easynews.com>
Message-ID: <wxoRl.328387$Yx2.227908@en-nntp-06.dc1.easynews.com>

Gosh, you guys are slow. :-) I figured it out.


From rhodri at wildebst.demon.co.uk  Thu May 21 23:44:15 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 04:44:15 +0100
Subject: When does the escape character work within raw strings?
In-Reply-To: <3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
Message-ID: <op.uubbb1cea8ncjz@gnudebst>

On Fri, 22 May 2009 03:42:18 +0100, walterbyrd <walterbyrd at iname.com>  
wrote:

> I guess I am confused about when when escape characters are are
> interpersonal as escape characters, and escape characters are not
> treated as escape characters.

No, you're confused about the number of entirely different things
that are interpreting a string, and the difference between a string
literal and a string object.

> Sometimes escape characters in regular strings are treated as escape
> characters, sometimes not. Same seems to go for raw strings. So how do
> I know?
>
> IMO: '\' characters in raw strings should not be given any special
> meaning. That would also solve the common problem of r'c:\whatever\'
> not working in python. But I digress.

Escaping the delimiting quote is the *one* time backslashes have a
special meaning in raw string literals.

> To me this does not seem right. r'\n' should not equal '\n'

And it doesn't.  Let me explain.  No, that would take too long,
let me summarise. :-)

>>>> s = 'x\nx'

`s` is a string object containing the character 'x', a newline, and 'x'.

>>>> a = re.sub('\n', 'x', s)

This calls re.sub with a pattern string object that contains a single
newline character.  Since this character has no special meaning to the
sub function it faithfully searches `s` for newlines, and, finding one,
replaces it with an 'x' character.

>>>> a = re.sub(r'\n', 'x', s)

This calls re.sub with a pattern string object that contains two
characters, a backslash followed by an 'n'.  This combination *does*
have a special meaning to the sub function, which does it's own
translation of the pattern into a single newline character.  Then,
as before, it spots the newline in `s` and replaces it with an 'x'.

Note, however, that the string object created by the raw string literal
was *two* characters long.  It's re.sub (in common with the rest of the
re module functions) that chooses to interpret the backslash specially.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Fri May 22 00:17:52 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 05:17:52 +0100
Subject: Adding a Par construct to Python?
In-Reply-To: <16b51c17-b293-461e-8e87-efed1d35e5ba@o30g2000vbc.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
	<16b51c17-b293-461e-8e87-efed1d35e5ba@o30g2000vbc.googlegroups.com>
Message-ID: <op.uubcv2ufa8ncjz@gnudebst>

On Wed, 20 May 2009 09:19:50 +0100, <jeremy at martinfamily.freeserve.co.uk>  
wrote:

> On 20 May, 03:43, Steven D'Aprano
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> On Tue, 19 May 2009 03:57:43 -0700, jeremy wrote:
>> > As I wrote before, concurrency is one of the hardest things for
>> > professional programmers to grasp. For 'amateur' programmers we need  
>> to
>> > make it as simple as possible,

Here, I think, is the fatal flaw in your plan.  As Steven pointed out,
concurrency isn't simple.  All you are actually doing is making it
easier for 'amateur' programmers to write hard-to-debug buggy code,
since you seem to be trying to avoid making them think about how to
write parallelisable code at all.

> I *do* actually know a bit about concurrency and would never imply
> that *any* for loop could be converted to a parallel one. The
> intention of my remark "with my suggestion they could potentially get
> a massive speed up just by changing 'for' to 'par' or 'map' to
> 'pmap'." is that it could be applied in the particular circumstances
> where there are no dependencies between different iterations of the
> loop.

If you can read this newsgroup for a week and still put your hand on
your heart and say that programmers will check that there are no
dependencies before swapping 'par' for 'for', I want to borrow your
rose-coloured glasses.  That's not to say this isn't the right solution,
but you must be aware that people will screw this up very, very
regularly, and making the syntax easy will only up the frequency of
screw-ups.

> This shows why the sync event is needed - to avoid  race conditions on
> shared variables. It is borrowed from the BSP paradigm - although that
> is a distibuted memory approach. Without the sync clause, rule 5 would
> just be the standard way of defining a parallelisable loop.

Pardon my cynicism but sync would appear to have all the disadvantages
of message passing (in terms of deadlock opportunities) with none of
advantages (like, say, actual messages).  The basic single sync you put
forward may be coarse-grained enough to be deadlock-proof, but I would
need to be more convinced of that than I am at the moment before I was
happy.

> P.S. I have a couple of additional embellishments to share at this
> stage:
[snip]
> 2. Scope of the 'sync' command. It was pointed out to me by a
> colleague that I need to define what happens with sync when there are
> nested par loops. I think that it should be defined to apply to the
> innermost par construct which encloses the statement.

What I said before about deadlock-proofing?  Forget it.  There's hours
of fun to be had once you introduce scoping, not to mention the fact
that your inner loops can't now be protected against common code in the
outer loop accessing the shared variables.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Fri May 22 00:35:39 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 05:35:39 +0100
Subject: defaultdict's bug or feature?
In-Reply-To: <3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
	<op.uua0bujla8ncjz@gnudebst>
	<3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
Message-ID: <op.uubdppr7a8ncjz@gnudebst>

Please don't top-post, it makes the thread of argument hard to follow.

On Fri, 22 May 2009 01:44:37 +0100, Red Forks <redforks at gmail.com> wrote:

> You mean 'get' method should not alter the dict, does 'dict[key]' should  
> not
> alter the dict either?
>
> d = defaultdict(set)
> assert len(d) == 0
> print d[1]
> assert len(d) == 1
>
> auto insert value to dict, when value is not in dict, is what defaultdict
> try to do.

Behaviour you are deliberately avoiding by calling `get`, since that
explicitly behaves the same way that it does for dicts.  You're doing
two different things through two different interfaces with two different
specs.  Why are you expecting them to have the same effect?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From george.sakkis at gmail.com  Fri May 22 01:13:32 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Thu, 21 May 2009 22:13:32 -0700 (PDT)
Subject: Wrapping methods of built-in dict
References: <c60e66f1-0bb0-45e6-951f-c8909df7ea11@w35g2000prg.googlegroups.com>
	<pan.2009.05.21.02.31.28@REMOVE.THIS.cybersource.com.au>
	<6f21d89b-755d-40b8-a42b-0510e5580f93@g22g2000pra.googlegroups.com>
Message-ID: <e45fc0ef-d446-4674-8541-d3c6f1634764@y7g2000yqa.googlegroups.com>

On May 21, 5:55?pm, shailesh <kochhar... at gmail.com> wrote:

> There doesn't seem to be a predicate returning method wrappers. Is
> there an alternate way to query an object for attributes that are of
> method wrappers?

Sure:
>>> MethodWrapper = type({}.__init__)
>>> isinstance([].__len__, MethodWrapper)
True

But you're better off catching everything by checking with callable()
(or equivalently hasattr(obj, '__call__')).

> This exercise also makes me question if I'm going about this
> correctly. If I want to add functionality to the methods of a class or
> an object are decorators and the inspect module the pythonic way to go
> about it? I can think of alternative implementations either through
> metaclasses or proxy objects.

In my experience, it's quite unlikely to really want to decorate
indiscriminately *all* methods of a class/instance, let alone all the
special methods (e.g. __getattribute__ very rarely needs to be
overridden). Do you have an actual use case or are you just playing
around ?

George


From timr at probo.com  Fri May 22 01:16:58 2009
From: timr at probo.com (Tim Roberts)
Date: Thu, 21 May 2009 22:16:58 -0700
Subject: monitoring friendly applications
References: <4a13cebd$0$9377$426a74cc@news.free.fr>
Message-ID: <t9dc15pbsvhr3hbhkb2461phkd32t196jr@4ax.com>

Imbaud Pierre <pierre.imbaud at gmail.com> wrote:
>
>I have A LOT of batch applications to monitor, on linux machines, mostly 
>written in python.
>I have to know:
>- which are active, at a given moment?
>- when did the last run occur? How long did it last?
>- for some daemons: are they stuck? generally, waiting for i/o, or lost 
>in some C call.
>...
>By any chance, does something like this exist? Would someone be 
>interested with this development?

http://www.letmegooglethatforyou.com?q=python+daemon+tools
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From timr at probo.com  Fri May 22 01:19:51 2009
From: timr at probo.com (Tim Roberts)
Date: Thu, 21 May 2009 22:19:51 -0700
Subject: making a python program in windows
References: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>
	<mailman.518.1242932391.8015.python-list@python.org>
Message-ID: <vcdc15hqiokji7cgeck0rkn9i2g1hh5rmv@4ax.com>

Dave Angel <davea at ieee.org> wrote:
>
>Anyway, now you can see two batch files you could use to make a 
>particular version of Python active.  The first one uses assoc and ftype 
>to fix the asssociations. And the other changes the environment variable 
>PATHEXT to make the extension optional.  Note that changing the 
>environment variable is effective only for that DOS box, and its 
>children.  If you want a permanent change, you need to change the 
>registry, probably at
>   hklm\SYSTEM\ControlSet001\Contro/Session\Session 
>Manager\Environment\PATHEXT

The better way to do this is to bring up the System control panel applet
(shortcut: WindowsKey + Pause/Break), Advanced, Environment Variables.  In
the System variables, click PATHEXT and Edit, and add ;.PY;.PYW to the end.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From andreengels at gmail.com  Fri May 22 02:31:21 2009
From: andreengels at gmail.com (Andre Engels)
Date: Fri, 22 May 2009 08:31:21 +0200
Subject: 4 hundred quadrillonth?
In-Reply-To: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
Message-ID: <6faf39c90905212331r3f11f53bu3fdbd2719ccb1e6a@mail.gmail.com>

On Thu, May 21, 2009 at 11:05 PM,  <seanm.py at gmail.com> wrote:
> The explaination in my introductory Python book is not very
> satisfying, and I am hoping someone can explain the following to me:
>
>>>> 4 / 5.0
> 0.80000000000000004
>
> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> It bothers me.

Well, how much would 1 / 3.0 be? Maybe 0.3333333333... with a certain
(large) number of threes? And if you multiply that by 3, will it be
1.0 again? No, because you cannot represent 1/3.0 as a precise decimal
fraction.

Internally, what is used are not decimal but binary fractions. And as
a binary fraction, 4/5.0 is just as impossible to represent as 1/3.0
is (1/3.0 = 0.0101010101... and 4/5.0 = 0.110011001100... to be
exact). So 4 / 5.0 gives you the binary fraction of a certain
precision that is closest to 0.8. And apparently that is close to
0.80000000000000004


-- 
Andr? Engels, andreengels at gmail.com


From gandalf at shopzeus.com  Fri May 22 02:34:17 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 22 May 2009 08:34:17 +0200
Subject: dbfpy - cannot store new record
In-Reply-To: <71b49836-d306-4399-9543-038ca69e9abb@v23g2000pro.googlegroups.com>
References: <4A153A10.1080906@shopzeus.com>	<mailman.510.1242921221.8015.python-list@python.org>
	<71b49836-d306-4399-9543-038ca69e9abb@v23g2000pro.googlegroups.com>
Message-ID: <4A164769.5050802@shopzeus.com>


>> Here is the next problem. For boolean/logical fields, I can set their
>> value to True/False easily. However, setting NULL seems impossible:
>>
>> rec = tbl.newRecord()
>> rec["SOMEFIELD1"] = True # Works fine
>> rec["SOMEFIELD2"] = False # Works fine
>> rec["SOMEFIELD3"] = None # Will store False
>> rec["SOMEFIELD3"] = 0 # Will store False
>> rec["SOMEFIELD3"] = "" # Will store False
>> rec["SOMEFIELD3"] = chr(32) # Will store False
>> rec["SOMEFIELD3"] = chr(0) # Will store False
>> rec.store()
>>
>> Strange thing: if I do not set the value of a numeric field, it becomes
>> NULL. The same thing I cannot do for logical fields: if I do not set the
>> value of a logical field, it becomes an invalid value, denoted with a
>> question mark.
>>     
>
> That's not "invalid", it *is* "NULL" according to DBF convention.
>   
Now I also tried to set -1. In any of the above cases, if I open that 
dbf file with a commercial DBF editor application then I see that the 
value is not null.

- Borland Database Desktop shows "False" value
- CDBF shows an invalid value, noted with a question mark (screenshot 
attached)

Best,

   Laszlo



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From david.lyon at preisshare.net  Fri May 22 02:35:54 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Fri, 22 May 2009 02:35:54 -0400
Subject: dbfpy - cannot store new record
In-Reply-To: <4A164769.5050802@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com>	<mailman.510.1242921221.8015.python-list@python.org>
	<71b49836-d306-4399-9543-038ca69e9abb@v23g2000pro.googlegroups.com>
	<4A164769.5050802@shopzeus.com>
Message-ID: <89b96c19c29ffa4439c1f4cb9a26efda@preisshare.net>

On Fri, 22 May 2009 08:34:17 +0200, Laszlo Nagy <gandalf at shopzeus.com>
wrote:
> Now I also tried to set -1. In any of the above cases, if I open that 
> dbf file with a commercial DBF editor application then I see that the 
> value is not null.
> 
> - Borland Database Desktop shows "False" value
> - CDBF shows an invalid value, noted with a question mark (screenshot 
> attached)

dbfpy is very old code.....

Try setting up a CHAR(1) field and filling it with "Y" or "N" or
"T" or "F".. indicating yes,no,true or false...

This might be an easier solution...

otherwise... just debug the dbfpy code...


David



From gagsl-py2 at yahoo.com.ar  Fri May 22 03:00:57 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 22 May 2009 04:00:57 -0300
Subject: A question regd configobj
References: <5ead360a0905210423q526e21ffgad3be1415ac148dd@mail.gmail.com>
Message-ID: <op.uubkfvefx6zn5v@lepton.softlabbsas.com.ar>

En Thu, 21 May 2009 08:23:36 -0300, Srijayanth Sridhar  
<srijayanth at gmail.com> escribi?:

> I am wondering if it is possible to have hexadecimal strings in a ini  
> file
> and have configobj parse it correctly.
>
> for eg:
> moonwolf at trantor:~/python/config$ cat foo
> foo="\x96\x97"
> .
> .
> .
>>>> a=ConfigObj("foo")
>>>> a
> ConfigObj({'foo': '\\x96\\x97'})
>>>> a['foo']
> '\\x96\\x97'

Use the "string-escape" codec to decode that:

py> x = '\\x96\\x97'
py> x.decode("string-escape")
'\x96\x97'

You can decode more-or-less automatically the whole config file, using the  
walk method. See  
http://www.voidspace.org.uk/python/configobj.html#walking-a-section (the  
example covers exactly this use case)

-- 
Gabriel Genellina



From rustompmody at gmail.com  Fri May 22 03:15:32 2009
From: rustompmody at gmail.com (rustom)
Date: Fri, 22 May 2009 00:15:32 -0700 (PDT)
Subject: making a python program in windows
References: <mailman.488.1242897741.8015.python-list@python.org> 
	<l-OdnQ3QTPFTt4jXnZ2dnUVZ8tJi4p2d@bt.com>
	<c361a5d5-e63a-4117-8c55-21ae31245ff2@b6g2000pre.googlegroups.com>
	<Xns9C1284B6480C9duncanbooth@127.0.0.1>
Message-ID: <7530b645-d6dc-483a-94ed-0dfbe9331ee2@d7g2000prl.googlegroups.com>

On May 21, 5:09?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> rustom <rustompm... at gmail.com> wrote:
> > i suppose the question is entirely about setting properly (and
> > grokking) file associations -- why is a .py file associated with
> > pythonw and not python? And is making this association right enough to
> > make a .py file in windows behave like a shebang file in unix?
>
> I think the question about the file association is one you have to answer
> for yourself. When you install Python it associates .pyw with pythonw and
> .py with python. If something on your system has changed this the best
> thing you can do is to change it back.
>
> Try typing the following commands and then fixing any differences by typing
> the expected output as the command parameter
> (e.g. "assoc .py=Python.File"):
>
> C:\>assoc .py
> .py=Python.File
>
> C:\>assoc .pyw
> .pyw=Python.NoConFile
>
> C:\>ftype Python.file
> Python.file="C:\Python26\python.exe" "%1" %*
>
> C:\>ftype Python.NoConFile
> Python.NoConFile="C:\Python26\pythonw.exe" "%1" %*
>
> --
> Duncan Boothhttp://kupuguy.blogspot.com

Thanks for this (and all other) tips.
Strangely now my m/c shows things exactly like so. A new .py file gets
associated with python but two days ago it was with pythonw?!
Any recos on where I could read up on this stuff?


From rustompmody at gmail.com  Fri May 22 03:26:46 2009
From: rustompmody at gmail.com (rustom)
Date: Fri, 22 May 2009 00:26:46 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
Message-ID: <7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>

On May 22, 6:56?am, AggieDan04 <danb... at yahoo.com> wrote:
> The error in this example is roughly equivalent to the width of a red
> blood cell compared to the distance between Earth and the sun. ?There
> are very few applications that need more accuracy than that.

For a mathematician there are no inexact numbers; for a physicist no
exact ones.
Our education system is on the math side; reality it seems is on the
other.


From ldo at geek-central.gen.new_zealand  Fri May 22 03:28:03 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 22 May 2009 19:28:03 +1200
Subject: Cursor movement question
References: <3cmRl.90415$iW4.57403@en-nntp-01.dc1.easynews.com>
	<wxoRl.328387$Yx2.227908@en-nntp-06.dc1.easynews.com>
Message-ID: <gv5k63$t45$2@lust.ihug.co.nz>

In message <wxoRl.328387$Yx2.227908 at en-nntp-06.dc1.easynews.com>, Jive 
Dadson wrote:

> Gosh, you guys are slow. :-) I figured it out.

We were just waiting to see how long it would take you.



From gagsl-py2 at yahoo.com.ar  Fri May 22 03:35:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 22 May 2009 04:35:56 -0300
Subject: Error in code send Email
References: <8ca278430905202231w1b6a8cbsd50f88167b41251a@mail.gmail.com>
Message-ID: <op.uubl16ryx6zn5v@lepton.softlabbsas.com.ar>

En Thu, 21 May 2009 02:31:02 -0300, Kalyan Chakravarthy  
<kalyanchakravarthy at hyit.com> escribi?:

> I am using above  code to send an Email, for this i am not installed any
> SMTP setup my local , I just given import smtplib
> and I am getting following error
>
> **Traceback (most recent call last):
>   File "C:\Program
> Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py",
> line 500, in __call__
>     handler.post(*groups)
>   File "C:\Documents and Settings\desk\Desktop\apps\temp\main.py",
> line 129, in post
>     smtp_server = smtplib.SMTP( 'mail.%s' % mail.split( '@' )[-1] )
>   File "C:\Python26\lib\smtplib.py", line 239, in __init__
>     (code, msg) = self.connect(host, port)
>   File "C:\Python26\lib\smtplib.py", line 295, in connect
>     self.sock = self._get_socket(host, port, self.timeout)
>   File "C:\Python26\lib\smtplib.py", line 273, in _get_socket
>     return socket.create_connection((port, host), timeout)
> AttributeError: 'module' object has no attribute 'create_connection'

I think Google App Engine doesn't allow to use sockets directly.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May 22 03:42:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 22 May 2009 04:42:21 -0300
Subject: from __future__ import absolute_import issue
References: <1aeb486c-eef8-453c-8d04-fd831a84f8e2@g22g2000pra.googlegroups.com>
Message-ID: <op.uubmcvywx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 20 May 2009 20:18:02 -0300, LittleGrasshopper  
<seattlehanks at yahoo.com> escribi?:

> New to the group, this is my first post...
>
> It appears that either absolute imports (or my brain) aren't working.
> Given a module string.py which is in the same directory as a.py:
>
> #File a.py
> from __future__ import absolute_import
>
> import string
>
> print string # Module imported is string.py in current directory, not
> standard library module

absolute_import helps with imports inside a package (those are "relative"  
imports, relative to the package). If a module is located in a directory  
listed in sys.path, an absolute import will find it. I don't think there  
is a way to avoid shadowing a standard module (other than ensuring the  
standard directories come first in sys.path).

-- 
Gabriel Genellina



From mail at timgolden.me.uk  Fri May 22 03:54:59 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 22 May 2009 08:54:59 +0100
Subject: making a python program in windows
In-Reply-To: <7530b645-d6dc-483a-94ed-0dfbe9331ee2@d7g2000prl.googlegroups.com>
References: <mailman.488.1242897741.8015.python-list@python.org>
	<l-OdnQ3QTPFTt4jXnZ2dnUVZ8tJi4p2d@bt.com>	<c361a5d5-e63a-4117-8c55-21ae31245ff2@b6g2000pre.googlegroups.com>	<Xns9C1284B6480C9duncanbooth@127.0.0.1>
	<7530b645-d6dc-483a-94ed-0dfbe9331ee2@d7g2000prl.googlegroups.com>
Message-ID: <4A165A53.1010400@timgolden.me.uk>

rustom wrote:
> Thanks for this (and all other) tips.
> Strangely now my m/c shows things exactly like so. A new .py file gets
> associated with python but two days ago it was with pythonw?!
> Any recos on where I could read up on this stuff?

I by "all this stuff" you mean: Windows file associations,
then this would be the place:

  http://msdn.microsoft.com/en-us/library/dd758090(VS.85).aspx

If you mean: what the Python installer does to set such
things up, then there is some information here:

  http://docs.python.org/using/windows.html

but not really covering the exact question you've
been asking. You'd have to hunt around the archives
of this mailing list and/or look at the msi source:

  http://svn.python.org/view/python/trunk/Tools/msi/msi.py?view=markup

(and feel free to submit a doc patch if you think it might help)

TJG


From gagsl-py2 at yahoo.com.ar  Fri May 22 04:03:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 22 May 2009 05:03:56 -0300
Subject: Generating zipped or gzipped attachment with email package?
References: <20090521133409.A5F1E1084F58@montanaro.dyndns.org>
Message-ID: <op.uubncus9x6zn5v@lepton.softlabbsas.com.ar>

En Thu, 21 May 2009 10:34:09 -0300, <skip at pobox.com> escribi?:

> I want to modify my script to automatically zip or gzip files which  
> exceed
> some size threshold.  Doing the zip/gzip dance is no problem.  I'm  
> concerned
> about how to specify that properly with the email package.  For example,
> consider a large CSV file.  I figure out the MIME type is text/csv.  Now
> suppose I gzip the file before attaching it.  How would this code change  
> to
> specify the compression where "path" is now compressed?

HTTP uses the Content-Coding: gzip header field, but I think there is no  
equivalent in MIME :(
I'm afraid you'll have to declare the attachment as a gzipped file, and  
let the user manually unzip and handle the contained csv file.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May 22 04:34:08 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 22 May 2009 05:34:08 -0300
Subject: Question about locals()
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
	<49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>
Message-ID: <op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 19 May 2009 14:06:04 -0300, G?khan SEVER <gokhansever at gmail.com>  
escribi?:

> I will make double sure myself while using locals() to end up with valid
> identifiers.

I would ask myself why I'm using locals() in the first place.


-- 
Gabriel Genellina



From ldo at geek-central.gen.new_zealand  Fri May 22 04:43:10 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 22 May 2009 20:43:10 +1200
Subject: sqlite3, qmarks, and NULL values
References: <mailman.424.1242778866.8015.python-list@python.org>
Message-ID: <gv5oiu$vqb$1@lust.ihug.co.nz>

In message <mailman.424.1242778866.8015.python-list at python.org>, Mitchell L 
Model wrote:

> However, COL2 might be NULL. I can't figure out a value for y that would
> retrieve rows for which COL2 is NULL. It seems to me that I have to
> perform an awkward test to determine whether to execute a query with one
> question mark or two.

In SQL, NULL is supposed to be a special case, by design. Perhaps you 
shouldn't be using NULL in your data values here.



From kalyanchakravarthy at hyit.com  Fri May 22 04:50:21 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Fri, 22 May 2009 14:20:21 +0530
Subject: Error in code send Email
In-Reply-To: <op.uubl16ryx6zn5v@lepton.softlabbsas.com.ar>
References: <8ca278430905202231w1b6a8cbsd50f88167b41251a@mail.gmail.com>
	<op.uubl16ryx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <8ca278430905220150y2de115c3xe67e84f2b3ef6a65@mail.gmail.com>

*Google App Engine doesn't allow to use sockets directly *Then what could be
the solution for this ?

can any one Reply me


Regards
Kalyan

On Fri, May 22, 2009 at 1:05 PM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Thu, 21 May 2009 02:31:02 -0300, Kalyan Chakravarthy <
> kalyanchakravarthy at hyit.com> escribi?:
>
>  I am using above  code to send an Email, for this i am not installed any
>> SMTP setup my local , I just given import smtplib
>> and I am getting following error
>>
>> **Traceback (most recent call last):
>>  File "C:\Program
>> Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py",
>> line 500, in __call__
>>    handler.post(*groups)
>>  File "C:\Documents and Settings\desk\Desktop\apps\temp\main.py",
>> line 129, in post
>>    smtp_server = smtplib.SMTP( 'mail.%s' % mail.split( '@' )[-1] )
>>  File "C:\Python26\lib\smtplib.py", line 239, in __init__
>>    (code, msg) = self.connect(host, port)
>>  File "C:\Python26\lib\smtplib.py", line 295, in connect
>>    self.sock = self._get_socket(host, port, self.timeout)
>>  File "C:\Python26\lib\smtplib.py", line 273, in _get_socket
>>    return socket.create_connection((port, host), timeout)
>> AttributeError: 'module' object has no attribute 'create_connection'
>>
>
> *I think Google App Engine doesn't allow to use sockets directly.*
>
> --
> *Gabriel Genellina*
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Regards
Kalyan
Mobile no: +91 9985351220
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From redforks at gmail.com  Fri May 22 04:53:04 2009
From: redforks at gmail.com (Red Forks)
Date: Fri, 22 May 2009 16:53:04 +0800
Subject: defaultdict's bug or feature?
In-Reply-To: <op.uubdppr7a8ncjz@gnudebst>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
	<op.uua0bujla8ncjz@gnudebst>
	<3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
	<op.uubdppr7a8ncjz@gnudebst>
Message-ID: <3f18b3f10905220153u57016ddby3e31ada91630da0d@mail.gmail.com>

Yes, you maybe right. When use defaultdict, should not rely get() method
anymore, d[] is just enough. When a function return a defaultdict, but
people don't know it, so:

d = load_map()
# if she call d['a'], everything is OK but
# when call d.get('a'), she is always get None.
# Why she call d.get('a'), not d['a'], because she don't want to provider
default value herself (she didn't know it is a defaultdict)
It is just wield, call d[''a'] Ok, not get('a').

Sorry my poor english. Maybe somebody don't catch my mind, or maybe a little
rude.
I'm using and learning python about 2 weeks ago, spent me three hrs to find
the problem, almost drive me mad.
Maybe other like me, find some inconvience on this.

--------------------------------------------------------------------------------------

Actually, I steal defaultdict to do other things:

class OnloadDict(defaultdict):
    def __init__(self, onload):
        self.__onload = onload

    def __missing__(self, key):
        result = self.__onload(key)
        if not result:
            raise KeyError

        self[key] = result
        return result

    def get(self, key, default = None):
        ''' defaultdict.get() won't call __missing__, so override '''
        try:
            return self[key]
        except KeyError:
            return default

OnloadDict, is like a cache. When the value is not in dict, using 'onload'
function to load the value by the key.
When no value correspond to a key, a KeyError will raised. So I need a
*safer* version 'get()' method.

On Fri, May 22, 2009 at 12:35 PM, Rhodri James
<rhodri at wildebst.demon.co.uk>wrote:

> Please don't top-post, it makes the thread of argument hard to follow.
>
> On Fri, 22 May 2009 01:44:37 +0100, Red Forks <redforks at gmail.com> wrote:
>
>  You mean 'get' method should not alter the dict, does 'dict[key]' should
>> not
>> alter the dict either?
>>
>> d = defaultdict(set)
>> assert len(d) == 0
>> print d[1]
>> assert len(d) == 1
>>
>> auto insert value to dict, when value is not in dict, is what defaultdict
>> try to do.
>>
>
> Behaviour you are deliberately avoiding by calling `get`, since that
> explicitly behaves the same way that it does for dicts.  You're doing
> two different things through two different interfaces with two different
> specs.  Why are you expecting them to have the same effect?
>
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From joelc at cognyx.com  Fri May 22 05:17:50 2009
From: joelc at cognyx.com (Joel Ross)
Date: Fri, 22 May 2009 19:17:50 +1000
Subject: While Statement
Message-ID: <022660c5$0$21875$c3e8da3@news.astraweb.com>

Hi all,

I have this piece of code

class progess():

     def __init__(self, number,  char):

         total = number
         percentage = number
         while percentage > 0 :
             percentage = int(number/total*100)
             number-=1
             char+="*"
             print char

progess(999,  "*")

Just wondering if anyone has any ideas on way the percentage var gets 
set to the value 0 after the first loop.

Any feed back would be appreciated.

Regards

jross


From kushal.kumaran at gmail.com  Fri May 22 05:18:02 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Fri, 22 May 2009 14:48:02 +0530
Subject: Error in code send Email
In-Reply-To: <8ca278430905220150y2de115c3xe67e84f2b3ef6a65@mail.gmail.com>
References: <8ca278430905202231w1b6a8cbsd50f88167b41251a@mail.gmail.com> 
	<op.uubl16ryx6zn5v@lepton.softlabbsas.com.ar>
	<8ca278430905220150y2de115c3xe67e84f2b3ef6a65@mail.gmail.com>
Message-ID: <1e364c4e0905220218i7907a377n46c131a18eb414a1@mail.gmail.com>

On Fri, May 22, 2009 at 2:20 PM, Kalyan Chakravarthy
<kalyanchakravarthy at hyit.com> wrote:
> Google App Engine doesn't allow to use sockets directly Then what could be
> the solution for this ?
>
> can any one Reply me
>

Did you try google?

Searching for google app engine email immediately gives results.

See also: http://catb.org/esr/faqs/smart-questions.html

-- 
kushal


From davea at ieee.org  Fri May 22 05:26:25 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 22 May 2009 05:26:25 -0400
Subject: making a python program in windows
In-Reply-To: <vcdc15hqiokji7cgeck0rkn9i2g1hh5rmv@4ax.com>
References: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>	<mailman.518.1242932391.8015.python-list@python.org>
	<vcdc15hqiokji7cgeck0rkn9i2g1hh5rmv@4ax.com>
Message-ID: <4A166FC1.3070503@ieee.org>

Tim Roberts wrote:
> Dave Angel <davea at ieee.org> wrote:
>   
>> Anyway, now you can see two batch files you could use to make a 
>> particular version of Python active.  The first one uses assoc and ftype 
>> to fix the asssociations. And the other changes the environment variable 
>> PATHEXT to make the extension optional.  Note that changing the 
>> environment variable is effective only for that DOS box, and its 
>> children.  If you want a permanent change, you need to change the 
>> registry, probably at
>>   hklm\SYSTEM\ControlSet001\Contro/Session\Session 
>> Manager\Environment\PATHEXT
>>     
>
> The better way to do this is to bring up the System control panel applet
> (shortcut: WindowsKey + Pause/Break), Advanced, Environment Variables.  In
> the System variables, click PATHEXT and Edit, and add ;.PY;.PYW to the end.
>   

Certainly that's how I'd do it.  But the OP was averse to even using the 
OpenWith dialog to change the file associations.  He wanted a 
commandline/batch/script way of doing it.  So why would I give him the 
same kind of an answer for modifying environment vars?




From jeremy at martinfamily.freeserve.co.uk  Fri May 22 05:27:21 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Fri, 22 May 2009 02:27:21 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
	<16b51c17-b293-461e-8e87-efed1d35e5ba@o30g2000vbc.googlegroups.com>
	<mailman.555.1242965876.8015.python-list@python.org>
Message-ID: <f21b5b47-20ec-4d01-aecf-123b45facc8b@l28g2000vba.googlegroups.com>

On 22 May, 05:17, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> On Wed, 20 May 2009 09:19:50 +0100, <jer... at martinfamily.freeserve.co.uk> ?
> wrote:
>
> > On 20 May, 03:43, Steven D'Aprano
> > <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> >> On Tue, 19 May 2009 03:57:43 -0700, jeremy wrote:
> >> > As I wrote before, concurrency is one of the hardest things for
> >> > professional programmers to grasp. For 'amateur' programmers we need ?
> >> to
> >> > make it as simple as possible,
>
> Here, I think, is the fatal flaw in your plan. ?As Steven pointed out,
> concurrency isn't simple. ?All you are actually doing is making it
> easier for 'amateur' programmers to write hard-to-debug buggy code,
> since you seem to be trying to avoid making them think about how to
> write parallelisable code at all.
>
> > I *do* actually know a bit about concurrency and would never imply
> > that *any* for loop could be converted to a parallel one. The
> > intention of my remark "with my suggestion they could potentially get
> > a massive speed up just by changing 'for' to 'par' or 'map' to
> > 'pmap'." is that it could be applied in the particular circumstances
> > where there are no dependencies between different iterations of the
> > loop.
>
> If you can read this newsgroup for a week and still put your hand on
> your heart and say that programmers will check that there are no
> dependencies before swapping 'par' for 'for', I want to borrow your
> rose-coloured glasses. ?That's not to say this isn't the right solution,
> but you must be aware that people will screw this up very, very
> regularly, and making the syntax easy will only up the frequency of
> screw-ups.
>
> > This shows why the sync event is needed - to avoid ?race conditions on
> > shared variables. It is borrowed from the BSP paradigm - although that
> > is a distibuted memory approach. Without the sync clause, rule 5 would
> > just be the standard way of defining a parallelisable loop.
>
> Pardon my cynicism but sync would appear to have all the disadvantages
> of message passing (in terms of deadlock opportunities) with none of
> advantages (like, say, actual messages). ?The basic single sync you put
> forward may be coarse-grained enough to be deadlock-proof, but I would
> need to be more convinced of that than I am at the moment before I was
> happy.
>
>
>
> > P.S. I have a couple of additional embellishments to share at this
> > stage:
> [snip]
> > 2. Scope of the 'sync' command. It was pointed out to me by a
> > colleague that I need to define what happens with sync when there are
> > nested par loops. I think that it should be defined to apply to the
> > innermost par construct which encloses the statement.
>
> What I said before about deadlock-proofing? ?Forget it. ?There's hours
> of fun to be had once you introduce scoping, not to mention the fact
> that your inner loops can't now be protected against common code in the
> outer loop accessing the shared variables.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses

Hi Rhodri,

> If you can read this newsgroup for a week and still put your hand on
> your heart and say that programmers will check that there are no
> dependencies before swapping 'par' for 'for', I want to borrow your
> rose-coloured glasses.

I think this depends on whether we think that Python is a language for
people who we trust to know what they are doing (like Perl) or whether
it is a language for people we don't trust to get things right(like
Java). I suspect it probably lies somewhere in the middle.

Actually the 'sync' command could lead to deadlock potentially:

par i in range(2):
    if i == 1:
        sync

In this case there are two threads (or virtual threads): one thread
waits for a sync, the other does not, hence deadlock.

My view about deadlock avoidance is that it should not be built into
the language - that would make everything too restrictive - instead
people should use design patterns which guarantee freedom from
deadlock.

See http://www.wotug.org/docs/jeremy-martin/index.shtml

Jeremy


From tuomas.vesterinen at iki.fi  Fri May 22 05:32:40 2009
From: tuomas.vesterinen at iki.fi (Tuomas Vesterinen)
Date: Fri, 22 May 2009 12:32:40 +0300
Subject: Ambiguous locale.strxfrm
Message-ID: <4a167138$0$6271$9b536df3@news.fv.fi>

This was fixed once in Python 2.5, but in Python 3.0 the bug celebrates 
its comeback. The tail of the strxfrm result is ambiguous.

Python 3.0.1 (r301:69556, Apr 14 2009, 14:30:31)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import locale
 >>> locale.setlocale(locale.LC_COLLATE, 'en_US.utf8')
'en_US.utf8'
 >>> key1=locale.strxfrm('maupassant guy')
 >>>> for i in range(10):
...     print(locale.strxfrm('maupassant guy')==key1)
...
False
True
False
False
False
False
False
False
False
False

Tuomas Vesterinen


From kushal.kumaran at gmail.com  Fri May 22 05:33:12 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Fri, 22 May 2009 15:03:12 +0530
Subject: While Statement
In-Reply-To: <022660c5$0$21875$c3e8da3@news.astraweb.com>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
Message-ID: <1e364c4e0905220233n573cf007lb2f2c40c1163a2e6@mail.gmail.com>

On Fri, May 22, 2009 at 2:47 PM, Joel Ross <joelc at cognyx.com> wrote:
> Hi all,
>
> I have this piece of code
>
> class progess():
>
> ? ?def __init__(self, number, ?char):
>
> ? ? ? ?total = number
> ? ? ? ?percentage = number
> ? ? ? ?while percentage > 0 :
> ? ? ? ? ? ?percentage = int(number/total*100)
> ? ? ? ? ? ?number-=1
> ? ? ? ? ? ?char+="*"
> ? ? ? ? ? ?print char
>
> progess(999, ?"*")
>
> Just wondering if anyone has any ideas on way the percentage var gets set to
> the value 0 after the first loop.
>

Put in a

from __future__ import division

statement at the start.  You can experiment in the python shell if you'd like.

>>> 2/3
0
>>> from __future__ import division
>>> 2/3
0.66666666666666663
>>>

This kind of division is the default in Python 3.

-- 
kushal


From andreengels at gmail.com  Fri May 22 05:34:18 2009
From: andreengels at gmail.com (Andre Engels)
Date: Fri, 22 May 2009 11:34:18 +0200
Subject: While Statement
In-Reply-To: <022660c5$0$21875$c3e8da3@news.astraweb.com>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
Message-ID: <6faf39c90905220234y19568c87uafd036fed186f60f@mail.gmail.com>

On Fri, May 22, 2009 at 11:17 AM, Joel Ross <joelc at cognyx.com> wrote:
> Hi all,
>
> I have this piece of code
>
> class progess():
>
> ? ?def __init__(self, number, ?char):
>
> ? ? ? ?total = number
> ? ? ? ?percentage = number
> ? ? ? ?while percentage > 0 :
> ? ? ? ? ? ?percentage = int(number/total*100)
> ? ? ? ? ? ?number-=1
> ? ? ? ? ? ?char+="*"
> ? ? ? ? ? ?print char
>
> progess(999, ?"*")
>
> Just wondering if anyone has any ideas on way the percentage var gets set to
> the value 0 after the first loop.
>
> Any feed back would be appreciated.

In Python 2.6 and lower, division of two integers gives an integer,
being the result without rest of division with rest:

>>> 4/3
1
>>> 5/3
1
>>> 6/3
2
>>>

In your example, the second run has number = 998, total = 999. 998/999
is evaluated to be zero.

There are two ways to change this:
1. Ensure that at least one of the things you are using in the
division is a float. You could for example replace "total = number" by
"total = float(number)" or "number/total*100" by
"float(number)/total*100" or by "(number*100.0)/total".
2. Use Python 3 behaviour here, which is done by putting the import
"from __future__ import division" in your code.


-- 
Andr? Engels, andreengels at gmail.com


From joelc at cognyx.com  Fri May 22 06:00:16 2009
From: joelc at cognyx.com (Joel Ross)
Date: Fri, 22 May 2009 20:00:16 +1000
Subject: While Statement
In-Reply-To: <022660c5$0$21875$c3e8da3@news.astraweb.com>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
Message-ID: <0032524a$0$9715$c3e8da3@news.astraweb.com>

Joel Ross wrote:
> Hi all,
> 
> I have this piece of code
> 
> class progess():
> 
>     def __init__(self, number,  char):
> 
>         total = number
>         percentage = number
>         while percentage > 0 :
>             percentage = int(number/total*100)
>             number-=1
>             char+="*"
>             print char
> 
> progess(999,  "*")
> 
> Just wondering if anyone has any ideas on way the percentage var gets 
> set to the value 0 after the first loop.
> 
> Any feed back would be appreciated.
> 
> Regards
> 
> jross

Thanks for the quick response and the heads up. Makes sense

Thank you. You guys helped me out alot:)


From yashgt at gmail.com  Fri May 22 06:03:50 2009
From: yashgt at gmail.com (Yash Ganthe)
Date: Fri, 22 May 2009 03:03:50 -0700 (PDT)
Subject: Looking for module for shrinking a list with n-point means
Message-ID: <64997d17-9811-4fb1-a729-c80dd9fbcd9a@g22g2000pra.googlegroups.com>

Hi,

I would like to shrink a large list in the following way:
If the List has 1000 integers, we need only 100 averages such that the
1000 points are average for every 10 consecutive values. So p0 to p9
will be averaged to obtain t0. p10 to p19 will be averaged to obtain
t1 and so on. This is a 10-point mean.

We are doing this as we collect a lot of data and plot it on a graph.
Too many samples makes the graph cluttered. So we need to reduce the
number of values in the way described above.

Does SciPy or NumPy or any other module have functions for achieving
this?

Which function can be used for doing this?

Thanks,
Yash


From joelc at cognyx.com  Fri May 22 06:35:46 2009
From: joelc at cognyx.com (Joel Ross)
Date: Fri, 22 May 2009 20:35:46 +1000
Subject: While Statement
In-Reply-To: <mailman.571.1242984862.8015.python-list@python.org>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
	<mailman.571.1242984862.8015.python-list@python.org>
Message-ID: <00325a9c$0$9685$c3e8da3@news.astraweb.com>

Andre Engels wrote:
> On Fri, May 22, 2009 at 11:17 AM, Joel Ross <joelc at cognyx.com> wrote:
>> Hi all,
>>
>> I have this piece of code
>>
>> class progess():
>>
>>    def __init__(self, number,  char):
>>
>>        total = number
>>        percentage = number
>>        while percentage > 0 :
>>            percentage = int(number/total*100)
>>            number-=1
>>            char+="*"
>>            print char
>>
>> progess(999,  "*")
>>
>> Just wondering if anyone has any ideas on way the percentage var gets set to
>> the value 0 after the first loop.
>>
>> Any feed back would be appreciated.
> 
> In Python 2.6 and lower, division of two integers gives an integer,
> being the result without rest of division with rest:
> 
>>>> 4/3
> 1
>>>> 5/3
> 1
>>>> 6/3
> 2
> 
> In your example, the second run has number = 998, total = 999. 998/999
> is evaluated to be zero.
> 
> There are two ways to change this:
> 1. Ensure that at least one of the things you are using in the
> division is a float. You could for example replace "total = number" by
> "total = float(number)" or "number/total*100" by
> "float(number)/total*100" or by "(number*100.0)/total".
> 2. Use Python 3 behaviour here, which is done by putting the import
> "from __future__ import division" in your code.
> 
> 

Im using 2.6 python and when running this

class progess():

     def __init__(self, number, total,  char):

         percentage = float(number/total*100)
         percentage = int(round(percentage))
         char = char * percentage
         print char

progess(100, 999,  "*")

the "percentage = float(number/total*100)" always equals 0.0
any ideas way this would be?


From joel.goldstick at columbuswebmakers.com  Fri May 22 06:48:16 2009
From: joel.goldstick at columbuswebmakers.com (Joel Goldstick)
Date: Fri, 22 May 2009 06:48:16 -0400
Subject: Streaming pdf with URLLib
In-Reply-To: <gv4sq3$8gj$1@panix3.panix.com>
References: <04eacd56-5293-4553-bdb3-ad2e8266c6b0@z7g2000vbh.googlegroups.com>
	<gv4sq3$8gj$1@panix3.panix.com>
Message-ID: <4A1682F0.6050809@columbuswebmakers.com>

I think you misspelled 'Content-Disposition'

Aahz wrote:
> In article <04eacd56-5293-4553-bdb3-ad2e8266c6b0 at z7g2000vbh.googlegroups.com>,
> Scooter  <slbentley at gmail.com> wrote:
>> #!/usr/bin/python
>>
>> import urllib
>>
>> u = urllib.urlopen('https://myinternal.server/pdfs/pdfstreamer.aspx')
>> print 'Content-type: application/pdf\n\n'
>> # print 'Content-type: application/x-msdownload; name=\"FileName\"\n
>> \n'
>> # print 'Content-Dispostion: attachment; filename=\"FileName\"\r\n\n'
>>
>> pdfdoc = u.read()
>> print pdfdoc
>>
>> Hitting my pdfstreamer.aspx app directly through a browser renders a
>> pdf just fine. So now I'm attempting to use this python app on an
>> external webserver, access it as a cgi, to pull the pdf, and then re-
>> render it, but at that point it just shows me the raw pdf in
>> the browser.
> 
> What application type does the browser report?



From andreas.tawn at ubisoft.com  Fri May 22 06:51:03 2009
From: andreas.tawn at ubisoft.com (Andreas Tawn)
Date: Fri, 22 May 2009 12:51:03 +0200
Subject: While Statement
Message-ID: <8AEDA5E3386EA742B8C24C95FF0C758006F4F551@PDC-MAIL3.ubisoft.org>

> Im using 2.6 python and when running this

> 

> class progess():

> 

>      def __init__(self, number, total,  char):

> 

>          percentage = float(number/total*100)

>          percentage = int(round(percentage))

>          char = char * percentage

>          print char

> 

> progess(100, 999,  "*")

> 

> the "percentage = float(number/total*100)" always equals 0.0

 

Try percentage = float(number)/total*100 # The closing bracket position
is the important one

 

The problem is that you're converting to float after the int division
damage has been done.

 

Cheers,

 

Drea

 

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From sjmachin at lexicon.net  Fri May 22 07:00:19 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 22 May 2009 04:00:19 -0700 (PDT)
Subject: Looking for module for shrinking a list with n-point means
References: <64997d17-9811-4fb1-a729-c80dd9fbcd9a@g22g2000pra.googlegroups.com>
Message-ID: <e290b7ab-aebb-4d27-8edb-c50b72d21606@b34g2000pra.googlegroups.com>

On May 22, 8:03?pm, Yash Ganthe <yas... at gmail.com> wrote:
> Hi,
>
> I would like to shrink a large list in the following way:
> If the List has 1000 integers, we need only 100 averages such that the
> 1000 points are average for every 10 consecutive values. So p0 to p9
> will be averaged to obtain t0. p10 to p19 will be averaged to obtain
> t1 and so on. This is a 10-point mean.
>
> We are doing this as we collect a lot of data and plot it on a graph.
> Too many samples makes the graph cluttered. So we need to reduce the
> number of values in the way described above.
>
> Does SciPy or NumPy

What do their docs say?


> or any other module have functions for achieving
> this?
>
> Which function can be used for doing this?

Perhaps one like this:

| >>> def n_point_means(alist, n):
| ...     blist = alist[:]
| ...     blist.sort()
| ...     size = len(blist)
| ...     assert 1 <= n <= size
| ...     assert size % n == 0
| ...     clist = []
| ...     fn = float(n)
| ...     for i in xrange(0, size, n):
| ...         clist.append(sum(blist[i:i+n]) / fn)
| ...     return clist
| ...
| >>> aaa = [9,8,7,6,5,4,3,2,0]
| >>> n_point_means(aaa,2)
| Traceback (most recent call last):
|   File "<stdin>", line 1, in <module>
|   File "<stdin>", line 6, in n_point_means
| AssertionError
| >>> aaa = [9,8,7,6,5,4,3,2,1,0]
| >>> n_point_means(aaa,2)
| [0.5, 2.5, 4.5, 6.5, 8.5]
| >>> n_point_means(aaa,5)
| [2.0, 7.0]
| >>>

Does that do what you want? If your requirement is so simple, why not
write it yourself?



From andreengels at gmail.com  Fri May 22 07:19:06 2009
From: andreengels at gmail.com (Andre Engels)
Date: Fri, 22 May 2009 13:19:06 +0200
Subject: While Statement
In-Reply-To: <00325a9c$0$9685$c3e8da3@news.astraweb.com>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
	<mailman.571.1242984862.8015.python-list@python.org>
	<00325a9c$0$9685$c3e8da3@news.astraweb.com>
Message-ID: <6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>

On Fri, May 22, 2009 at 12:35 PM, Joel Ross <joelc at cognyx.com> wrote:

> Im using 2.6 python and when running this
>
> class progess():
>
> ? ?def __init__(self, number, total, ?char):
>
> ? ? ? ?percentage = float(number/total*100)
> ? ? ? ?percentage = int(round(percentage))
> ? ? ? ?char = char * percentage
> ? ? ? ?print char
>
> progess(100, 999, ?"*")
>
> the "percentage = float(number/total*100)" always equals 0.0
> any ideas way this would be?

You have to make the conversion of integer to float before the
division. What you are calculating now is (take number = 998, total =
999)

number/total = 998/999 = 0
number/total*100 = 0*100 = 0
float(number/total*100) = float(0) = 0.0

Change "float(number/total*100)" to "float(number)/total*100" and it
should work:

float(number) = float(998) = 998.0
float(number)/total = 998.0/999 = 0.99899899899899902
float(number)/total*100 = 0.99899899899899902 * 100 = 99.899899899899902



-- 
Andr? Engels, andreengels at gmail.com


From bvrkchowdary at yahoo.co.in  Fri May 22 07:26:49 2009
From: bvrkchowdary at yahoo.co.in (VenkataRamaKrishna Boddu)
Date: Fri, 22 May 2009 16:56:49 +0530 (IST)
Subject: Disabling Logging Handler for a Second
Message-ID: <839278.93751.qm@web8408.mail.in.yahoo.com>

Hi All,

Is there any way, I can disable one logging Handler, while other Log Handler are still available for servicing.....

Please see the below code. It explains my Problem better.
I actually reduce the size of problem, to make it understandable faster


------------------------------------------------------------------------------------------------------------------------------
import logging;
import sys;

thelog = logging.getLogger('app.scsi.cdb');
strmHdlr = logging.StreamHandler(sys.stdout);
fHdlr = logging.FileHandler('a.log')

thelog.addHandler(strmHdlr);
thelog.addHandler(fHdlr);
thelog.setLevel(logging.DEBUG);

thelog.info('Hello Python Logger');
thelog.info('This is Venkata Rama Krishna');

## Now, I want to disable the strmHdlr for some moment without
## actually removing the Handler from logger Object,
## I want to say something like
##
## thelog.disable('StreamHandler');
##
## So., that it disables all the Stream Handlers attached to the Logger Object

## The Need for me is that, I should write My Email Id only to File Stream
## and because of some reasons of moduler design, I don't have references to the
## both the Handlers

## Here, I don't have want to do the StreamHandler removing stuff and adding it again later on
thelog.removeHandler(strmHdlr);
thelog.info('Email: bvrkchowdary at yahoo.co.in');


## Now, I want to re-enable the strmHdlr without
## actually adding the Handler to the logger Object
## I want to say something like
##
## thelog.enable('StreamHandler');
##
## So., that it disables all the Stream Handlers attached to the Logger Object

## Now, I can write my Phone Number to both the Streams

## Here, I don't want to do the Stream Handler adding stuff 
thelog.addHandler(strmHdlr);
thelog.info('Phone no: +91-9985778581');
------------------------------------------------------------------------------------------------------------------------------

Thanking you,
Venkata Rama Krishna Boddu  


      Cricket on your mind? Visit the ultimate cricket website. Enter http://beta.cricket.yahoo.com
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From joelc at cognyx.com  Fri May 22 07:33:05 2009
From: joelc at cognyx.com (Joel Ross)
Date: Fri, 22 May 2009 21:33:05 +1000
Subject: While Statement
In-Reply-To: <mailman.575.1242991149.8015.python-list@python.org>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>	<mailman.571.1242984862.8015.python-list@python.org>	<00325a9c$0$9685$c3e8da3@news.astraweb.com>
	<mailman.575.1242991149.8015.python-list@python.org>
Message-ID: <0032680f$0$9718$c3e8da3@news.astraweb.com>

Andre Engels wrote:
> On Fri, May 22, 2009 at 12:35 PM, Joel Ross <joelc at cognyx.com> wrote:
> 
>> Im using 2.6 python and when running this
>>
>> class progess():
>>
>>    def __init__(self, number, total,  char):
>>
>>        percentage = float(number/total*100)
>>        percentage = int(round(percentage))
>>        char = char * percentage
>>        print char
>>
>> progess(100, 999,  "*")
>>
>> the "percentage = float(number/total*100)" always equals 0.0
>> any ideas way this would be?
> 
> You have to make the conversion of integer to float before the
> division. What you are calculating now is (take number = 998, total =
> 999)
> 
> number/total = 998/999 = 0
> number/total*100 = 0*100 = 0
> float(number/total*100) = float(0) = 0.0
> 
> Change "float(number/total*100)" to "float(number)/total*100" and it
> should work:
> 
> float(number) = float(998) = 998.0
> float(number)/total = 998.0/999 = 0.99899899899899902
> float(number)/total*100 = 0.99899899899899902 * 100 = 99.899899899899902
> 
> 
> 
changed it to "float(number)/total*100" and it worked thanks for all 
your help appreciated

thanks again


From tim.wintle at teamrubber.com  Fri May 22 08:19:36 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 22 May 2009 13:19:36 +0100
Subject: While Statement
In-Reply-To: <6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
	<mailman.571.1242984862.8015.python-list@python.org>
	<00325a9c$0$9685$c3e8da3@news.astraweb.com>
	<6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>
Message-ID: <1242994776.8046.137.camel@tim-laptop>

On Fri, 2009-05-22 at 13:19 +0200, Andre Engels wrote:
> number/total = 998/999 = 0
> number/total*100 = 0*100 = 0
> float(number/total*100) = float(0) = 0.0
> 
> Change "float(number/total*100)" to "float(number)/total*100" and it
> should work:

I'd use:

 (number * 100.)/total

- works because
 <int> * <float> => <float> 

It's a minor thing, but it's much faster to cast implicitly as you miss
the python function call overhead - it's no extra work to write, and for
numerical things it can really speed things up.

>>> a = timeit.Timer("float(200)/5*100")
>>> b = timeit.Timer("(200*100.)/5")
>>> a.timeit(10000000)
12.282480955123901
>>> b.timeit(10000000)
3.6434230804443359

Tim W




From bvidinli at gmail.com  Fri May 22 08:40:10 2009
From: bvidinli at gmail.com (bvidinli)
Date: Fri, 22 May 2009 15:40:10 +0300
Subject: General: tutorial to all new python users
Message-ID: <36e8a7020905220540j5d7bc8eal2213ce6bc04414a1@mail.gmail.com>

This is a good starting point i think:
http://pleac.sourceforge.net/pleac_python/index.html

(Also a non-related subject:   for who want to do hosting freely on
linux: www.ehcp.net (hosting control panel), also contains an
experimental python backend)


From fasteliteprogrammer at yahoo.com  Fri May 22 08:51:30 2009
From: fasteliteprogrammer at yahoo.com (Craig)
Date: Fri, 22 May 2009 05:51:30 -0700 (PDT)
Subject: python question
Message-ID: <577505.8394.qm@web36505.mail.mud.yahoo.com>


I use python 2.6.2 and i useing ubuntu 9.04 not windows.

--- On Thu, 5/21/09, Dave Angel <davea at ieee.org> wrote:

> From: Dave Angel <davea at ieee.org>
> Subject: Re: python question
> To: "Craig" <fasteliteprogrammer at yahoo.com>
> Cc: python-list at python.org
> Date: Thursday, May 21, 2009, 2:22 PM
> Craig wrote:
> > How do i install this.i never seen a python write in c
> before.
> > 
> > 
> >???
> Well, I've never seen a snake program in any language,
> python or otherwise.? And I believe python was named
> after Monty Python, not the snake.? But once it got its
> name, snake puns abound.
> 
> Anyway, why not tell you what you want to install, and on
> what platform?? If it's Python 2.6.2 on MS Windows XP,
> just download and run the msi file.
> ???On web page:???http://www.python.org/download/, you'd choose Python
> 2.6.2 Windows installer <http://www.python.org/ftp/python/2.6.2/python-2.6.2.msi>?
> and it'd give you file python-2.6.2.msi
> 
> 
> 
> 


      


From tim.wintle at teamrubber.com  Fri May 22 09:05:36 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 22 May 2009 14:05:36 +0100
Subject: python question
In-Reply-To: <577505.8394.qm@web36505.mail.mud.yahoo.com>
References: <577505.8394.qm@web36505.mail.mud.yahoo.com>
Message-ID: <1242997536.8046.146.camel@tim-laptop>

On Fri, 2009-05-22 at 05:51 -0700, Craig wrote:
> I use python 2.6.2 and i useing ubuntu 9.04 not windows.

What are you trying to install?

is it available in Synaptic package manager?


If it's a program written in python, then there may be a file called
"setup.py". If there is then open a terminal, cd to that directory, and
then type:

python setup.py install

(you may need to do "sudo" before it) - that will normally automatically
compile any extensions written in C

hope that helps.


Tim W



From codes47 at gmail.com  Fri May 22 09:11:31 2009
From: codes47 at gmail.com (ashish)
Date: Fri, 22 May 2009 06:11:31 -0700 (PDT)
Subject: General: tutorial to all new python users
References: <mailman.579.1242996093.8015.python-list@python.org>
Message-ID: <67e0468f-4379-4d4f-9be6-97421fb4f1e0@s1g2000prd.googlegroups.com>

On May 22, 5:40?am, bvidinli <bvidi... at gmail.com> wrote:
> This is a good starting point i think:http://pleac.sourceforge.net/pleac_python/index.html
>
> (Also a non-related subject: ? for who want to do hosting freely on
> linux:www.ehcp.net(hosting control panel), also contains an
> experimental python backend)



From python-url at phaseit.net  Fri May 22 09:13:32 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Fri, 22 May 2009 13:13:32 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (May 22)
Message-ID: <gv68ds$bng$1@lairds.us>



QOTW:  "Floating point is sort of like quantum physics: the closer you look,
the messier it gets." - Grant Edwards


    The circular relationship between object and type explained:
        http://comments.gmane.org/gmane.comp.python.general/623460
    
    Floating point numbers don't behave exactly like "normal", real numbers:
        http://groups.google.com/group/comp.lang.python/t/3c78637de989d352/
    
    Java vs. Python: Performance comparison
        http://groups.google.com/group/comp.lang.python/t/29ed8f4cd209f833/
    
    The 'in' operator calls __getitem__ in some cases:
        http://groups.google.com/group/comp.lang.python/t/e1841f61a7194673/

    The Planet Python RSS feed is now available for purchase through the
    Kindle platform!  Don't worry, any profits go to the Python Software
    Foundation.
    
    A new syntax proposal: adding support for parallel code execution:
        http://groups.google.com/group/comp.lang.python/t/fd41d1ed79067d04/
    
    Libraries that strictly implement the DOM are usually "unpythonic":
        http://groups.google.com/group/comp.lang.python/t/6b8d8fe1a6f4eab6/
    
    PEP 384: Defining a Stable ABI
        http://groups.google.com/group/comp.lang.python/t/bb75e3a77b9845a7/
    
    Sometimes it's useful to be able to "push back" an item into an iterator:
        http://groups.google.com/group/comp.lang.python/t/52f753e338b13390/
    
    ... but resetting an iterator isn't always feasible:
        http://groups.google.com/group/comp.lang.python/t/fc1dea1f72dbcd97/
    
    
========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiasts":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.
	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    Enjoy the *Python Magazine*.
	http://pymag.phparch.com/

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
  http://search.gmane.org/?query=python+URL+weekly+news+links&group=gmane.comp.python.general&sort=date
  http://groups.google.com/groups/search?q=Python-URL!+group%3Acomp.lang.python&start=0&scoring=d&
  http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes

There is *not* an RSS for "Python-URL!"--at least not yet.  Arguments
for and against are occasionally entertained.


Suggestions/corrections for next week's posting are always welcome.
E-mail to <Python-URL at phaseit.net> should get through.

To receive a new issue of this posting in e-mail each Monday morning
(approximately), ask <claird at phaseit.net> to subscribe.  Mention
"Python-URL!".  Write to the same address to unsubscribe.


-- The Python-URL! Team--

Phaseit, Inc. (http://phaseit.net) is pleased to participate in and
sponsor the "Python-URL!" project.  Watch this space for upcoming
news about posting archives.


From mabdelkader at gmail.com  Fri May 22 09:40:29 2009
From: mabdelkader at gmail.com (ma)
Date: Fri, 22 May 2009 09:40:29 -0400
Subject: How to get path.py ? http://www.jorendorff.com/ is down
In-Reply-To: <33e2534d-706f-4cad-8b35-fb9dc22b25ee@l12g2000yqo.googlegroups.com>
References: <mailman.521.1242935026.8015.python-list@python.org> 
	<33e2534d-706f-4cad-8b35-fb9dc22b25ee@l12g2000yqo.googlegroups.com>
Message-ID: <148918f0905220640s6248842cq30bd2f31462e096d@mail.gmail.com>

http://web.archive.org/web/20071105095205/www.jorendorff.com/articles/python/path/


On Thu, May 21, 2009 at 4:10 PM, Kay Schluehr <kay at fiber-space.de> wrote:

> On 21 Mai, 21:43, Jorge Vargas <jorge.var... at gmail.com> wrote:
> > Hello.
> >
> > Anyone knows what is the problem with this package? apparently the
> > author's site is down which prevents pip from installing it. I can
> > download the zip and go from there but It seems most of the docs are
> > gone with the site.
>
> The code comments shall be sufficient. It is a single not very complex
> module that basically  unifies several stdlib APIs as methods of a
> string subclass.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From jcd at sdf.lonestar.org  Fri May 22 09:46:33 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 22 May 2009 09:46:33 -0400
Subject: reseting an iterator
In-Reply-To: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
Message-ID: <1242999993.1294.18.camel@aalcdl07>

On Wed, 2009-05-20 at 11:35 -0700, Jan wrote:
> Wouldn't it be easy for Python to implement generating functions so
> that the iterators they return are equipped with a __reset__() method?
> 
> Here is the context of this question.
> 
> Python documentation defines  a "iterator" as an object ITERATOR
> having methods __next__() and __iter__() such that the call
> ITERATOR.__iter__() returns the object itself, and once a call
> ITERATOR. __next__() raises StopIteration every such subsequent call
> does the same.

You don't need a reset method.  There is no hard and fast rule that
__iter__ must return the object itself.  It just needs to return an
iterator.  For example:

>>> l = [1,2,3]
>>> l.__iter__()
<listiterator object at 0x7fd0da315850>
>>> l is l.__iter__()
False

Just create a class with an __iter__ method that returns a reset
iterator object.


class X(object):
    def __init__(self, max=3):
        self.counter = 0
        self.max = max
    def __iter__(self):
        return self
    def next(self):
        if self.counter < self.max:
            self.counter += 1
            return self.counter
        else:
            raise StopIteration

class Y(object):
    def __iter__(self):
        return X()

In this setup, X has the problem you are trying to avoid, but Y behaves
as a resettable iterable.

>>> x = X()
>>> for c in x:
...     print c
... 
1
2
3
>>> for c in x:
...     print c
... 
>>> y = Y()
>>> for c in y:
...     print c
... 
1
2
3
>>> for c in y:
...     if c < 3:
...         print c
... 
1
2
>>> for c in y:
...     print c
... 
1
2
3

Cheers,
Cliff




From Scott.Daniels at Acm.Org  Fri May 22 09:50:10 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 22 May 2009 06:50:10 -0700
Subject: Looking for module for shrinking a list with n-point means
In-Reply-To: <64997d17-9811-4fb1-a729-c80dd9fbcd9a@g22g2000pra.googlegroups.com>
References: <64997d17-9811-4fb1-a729-c80dd9fbcd9a@g22g2000pra.googlegroups.com>
Message-ID: <eP6dnSX_2dDcMYvXnZ2dnUVZ_v2dnZ2d@pdx.net>

Yash Ganthe wrote:
> I would like to shrink a large list in the following way:
> If the List has 1000 integers, we need only 100 averages such that the
> 1000 points are average for every 10 consecutive values. So p0 to p9
> will be averaged to obtain t0. p10 to p19 will be averaged to obtain
> t1 and so on. This is a 10-point mean.
> 
> We are doing this as we collect a lot of data and plot it on a graph.
> Too many samples makes the graph cluttered. So we need to reduce the
> number of values in the way described above.

Does this give you a clue?

     import numpy as np

     v = np.arange(128)
     v.shape = (16, 8)
     sum(v.transpose()) / 8.

--Scott David Daniels
Scott.Daniels at Acm.Org


From davea at ieee.org  Fri May 22 09:59:37 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 22 May 2009 09:59:37 -0400
Subject: While Statement
In-Reply-To: <1242994776.8046.137.camel@tim-laptop>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>	<mailman.571.1242984862.8015.python-list@python.org>	<00325a9c$0$9685$c3e8da3@news.astraweb.com>	<6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>
	<1242994776.8046.137.camel@tim-laptop>
Message-ID: <4A16AFC9.90302@ieee.org>



Tim Wintle wrote:
> On Fri, 2009-05-22 at 13:19 +0200, Andre Engels wrote:
>   
>> number/total = 998/999 = 0
>> number/total*100 = 0*100 = 0
>> float(number/total*100) = float(0) = 0.0
>>
>> Change "float(number/total*100)" to "float(number)/total*100" and it
>> should work:
>>     
>
> I'd use:
>
>  (number * 100.)/total
>
> - works because
>  <int> * <float> => <float> 
>
> It's a minor thing, but it's much faster to cast implicitly as you miss
> the python function call overhead - it's no extra work to write, and for
> numerical things it can really speed things up.
>
>   
>>>> a = timeit.Timer("float(200)/5*100")
>>>> b = timeit.Timer("(200*100.)/5")
>>>> a.timeit(10000000)
>>>>         
> 12.282480955123901
>   
>>>> b.timeit(10000000)
>>>>         
> 3.6434230804443359
>
> Tim W
>
>
>
>   
It's the old-timer in me, but I'd avoid the float entirely.  You start 
with ints, and you want to end with ints.  So simply do the multiply 
first, then the divide.

 number * 100/total

will get the same answer.



From joelc at cognyx.com  Fri May 22 10:03:15 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sat, 23 May 2009 00:03:15 +1000
Subject: While Statement
In-Reply-To: <mailman.584.1243000792.8015.python-list@python.org>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>	<mailman.571.1242984862.8015.python-list@python.org>	<00325a9c$0$9685$c3e8da3@news.astraweb.com>	<6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>	<1242994776.8046.137.camel@tim-laptop>
	<mailman.584.1243000792.8015.python-list@python.org>
Message-ID: <0226a3ab$0$25479$c3e8da3@news.astraweb.com>

Dave Angel wrote:
> 
> 
> Tim Wintle wrote:
>> On Fri, 2009-05-22 at 13:19 +0200, Andre Engels wrote:
>>  
>>> number/total = 998/999 = 0
>>> number/total*100 = 0*100 = 0
>>> float(number/total*100) = float(0) = 0.0
>>>
>>> Change "float(number/total*100)" to "float(number)/total*100" and it
>>> should work:
>>>     
>>
>> I'd use:
>>
>>  (number * 100.)/total
>>
>> - works because
>>  <int> * <float> => <float>
>> It's a minor thing, but it's much faster to cast implicitly as you miss
>> the python function call overhead - it's no extra work to write, and for
>> numerical things it can really speed things up.
>>
>>  
>>>>> a = timeit.Timer("float(200)/5*100")
>>>>> b = timeit.Timer("(200*100.)/5")
>>>>> a.timeit(10000000)
>>>>>         
>> 12.282480955123901
>>  
>>>>> b.timeit(10000000)
>>>>>         
>> 3.6434230804443359
>>
>> Tim W
>>
>>
>>
>>   
> It's the old-timer in me, but I'd avoid the float entirely.  You start 
> with ints, and you want to end with ints.  So simply do the multiply 
> first, then the divide.
> 
> number * 100/total
> 
> will get the same answer.
> 

Cheers thanks for the support. if it works faster I'll definitely do it


From gokhansever at gmail.com  Fri May 22 10:27:12 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Fri, 22 May 2009 09:27:12 -0500
Subject: Question about locals()
In-Reply-To: <op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
	<49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>
	<op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <49d6b3500905220727i265f3eb8q8482ded1d79c03f4@mail.gmail.com>

Hello,

I use local() because I read a file which has many consecutive variables in
it. Like shown below: (I use numpy's txt reading function)

serialc = np.loadtxt(sys.argv[1], skiprows=skiprows).T
for i in range(20):
    locals()['serialc_bin' + str(i+1)] = serialc[i+4]

I don't know easier way than using locals() to construct variable-like
identities in my program.

G?khan


On Fri, May 22, 2009 at 3:34 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Tue, 19 May 2009 14:06:04 -0300, G?khan SEVER <gokhansever at gmail.com>
> escribi?:
>
>  I will make double sure myself while using locals() to end up with valid
>> identifiers.
>>
>
> I would ask myself why I'm using locals() in the first place.
>
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at REMOVE-THIS-cybersource.com.au  Fri May 22 10:28:05 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 22 May 2009 14:28:05 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
	<4A15EB3E.2000006@mrabarnett.plus.com>
	<4A15EF9E.8070406@islandtraining.com> <gv4st8$11t$1@ger.gmane.org>
	<mailman.551.1242955822.8015.python-list@python.org>
Message-ID: <003290e1$0$9725$c3e8da3@news.astraweb.com>

On Thu, 21 May 2009 18:30:17 -0700, Gary Herron wrote:

>> In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
>> point algorithm for Python so that the shortest repr that will round
>> trip correctly is what is used as the floating point repr....
>>
>> --David
>>   
>>   
> Which won't change the fact that 0.8 and lots of other favorite floats
> are still not representable exactly, but it will hide this fact from
> most newbies.  One of the nicer results of this will be that these
> (almost) weekly questions and discussions will be come a thing of the
> past.
> 
> With a sigh of relief,

Yay! We now will have lots of subtle floating point bugs that people 
can't see! Ignorance is bliss and what you don't know about floating 
point can't hurt you!

>>> 0.8 - (0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1) == 0.0
False
>>> 0.8 - 0.5 - 0.2 - 0.1 == 0.0
False




-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May 22 10:28:12 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 22 May 2009 14:28:12 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
Message-ID: <003290e8$0$9725$c3e8da3@news.astraweb.com>

On Thu, 21 May 2009 18:56:08 -0700, AggieDan04 wrote:

> The error in this example is roughly equivalent to the width of a red
> blood cell compared to the distance between Earth and the sun.  There
> are very few applications that need more accuracy than that.

Which is fine if the error *remains* that small, but the problem is that 
errors usually increase and rarely cancel.


-- 
Steven


From tim.wintle at teamrubber.com  Fri May 22 10:29:59 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 22 May 2009 15:29:59 +0100
Subject: While Statement
In-Reply-To: <4A16AFC9.90302@ieee.org>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
	<mailman.571.1242984862.8015.python-list@python.org>
	<00325a9c$0$9685$c3e8da3@news.astraweb.com>
	<6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>
	<1242994776.8046.137.camel@tim-laptop>  <4A16AFC9.90302@ieee.org>
Message-ID: <1243002599.1085.6.camel@tim-laptop>

On Fri, 2009-05-22 at 09:59 -0400, Dave Angel wrote:
> 
> Tim Wintle wrote:
> > On Fri, 2009-05-22 at 13:19 +0200, Andre Engels wrote:

> >> Change "float(number/total*100)" to "float(number)/total*100" and it
> >> should work:
> >>     
> >
> > I'd use:
> >
> >  (number * 100.)/total
> >
> > - works because
> >  <int> * <float> => <float> 

> It's the old-timer in me, but I'd avoid the float entirely.  You start 
> with ints, and you want to end with ints.  So simply do the multiply 
> first, then the divide.
> 
>  number * 100/total

Agreed, to be honest I'd not fully read the original post and didn't
realise everything was an int.




> 
> will get the same answer.
> 



From gandalf at shopzeus.com  Fri May 22 10:32:59 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 22 May 2009 16:32:59 +0200
Subject: dbfpy - cannot store new record
In-Reply-To: <89b96c19c29ffa4439c1f4cb9a26efda@preisshare.net>
References: <4A153A10.1080906@shopzeus.com>	<mailman.510.1242921221.8015.python-list@python.org>
	<71b49836-d306-4399-9543-038ca69e9abb@v23g2000pro.googlegroups.com>
	<4A164769.5050802@shopzeus.com>
	<89b96c19c29ffa4439c1f4cb9a26efda@preisshare.net>
Message-ID: <4A16B79B.5090601@shopzeus.com>


> dbfpy is very old code.....
>
> Try setting up a CHAR(1) field and filling it with "Y" or "N" or
> "T" or "F".. indicating yes,no,true or false...
>   
Unfortunately, my task is to import records into a database that is used 
by an old foxpro program. I'm not allowed to change the database 
structure in any way.
> otherwise... just debug the dbfpy code...
>   
This is what I'll do. Thanks.

   Laszlo



From drobinow at gmail.com  Fri May 22 10:43:01 2009
From: drobinow at gmail.com (David Robinow)
Date: Fri, 22 May 2009 10:43:01 -0400
Subject: Question about locals()
In-Reply-To: <49d6b3500905220727i265f3eb8q8482ded1d79c03f4@mail.gmail.com>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
	<49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>
	<op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>
	<49d6b3500905220727i265f3eb8q8482ded1d79c03f4@mail.gmail.com>
Message-ID: <4eb0089f0905220743v6f4c5b67n4b43dd742b3bc1b9@mail.gmail.com>

On Fri, May 22, 2009 at 10:27 AM, G?khan SEVER <gokhansever at gmail.com> wrote:
...
> serialc = np.loadtxt(sys.argv[1], skiprows=skiprows).T
> for i in range(20):
> ??? locals()['serialc_bin' + str(i+1)] = serialc[i+4]
>
> I don't know easier way than using locals() to construct variable-like
> identities in my program.

I don't either.  I also don't know why you feel you need to construct
variable-like identities.
Why is:
  serialc_bin1
better than
  serialc_bin[0]
or, for that matter,
 serialc[4]

???


From walterbyrd at iname.com  Fri May 22 10:47:49 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Fri, 22 May 2009 07:47:49 -0700 (PDT)
Subject: When does the escape character work within raw strings?
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
Message-ID: <8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>

On May 21, 9:44?pm, "Rhodri James" <rho... at wildebst.demon.co.uk>
wrote:

> Escaping the delimiting quote is the *one* time backslashes have a
> special meaning in raw string literals.

If that were true, then wouldn't r'\b' be treated as two characters?

> This calls re.sub with a pattern string object that contains two
> characters, a backslash followed by an 'n'. ?This combination *does*
> have a special meaning to the sub function, which does it's own
> translation of the pattern into a single newline character. ?

So when do I know when a raw string is treated as a raw string, and
when it's not?


From gokhansever at gmail.com  Fri May 22 11:00:34 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Fri, 22 May 2009 10:00:34 -0500
Subject: Question about locals()
In-Reply-To: <4eb0089f0905220743v6f4c5b67n4b43dd742b3bc1b9@mail.gmail.com>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
	<49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>
	<op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>
	<49d6b3500905220727i265f3eb8q8482ded1d79c03f4@mail.gmail.com>
	<4eb0089f0905220743v6f4c5b67n4b43dd742b3bc1b9@mail.gmail.com>
Message-ID: <49d6b3500905220800r3fff1748h822315acb8effa29@mail.gmail.com>

Because in this case serialc is an numpy array. Since loadtxt returns a
numpy-array. Furthermore

locals()['serialc_bin' + str(i+1)]  creates a dictionary key (that's what I
use the term "variable-like") serialc_bin1, serialc_bin2, ... not
serialc_bin[0] with indexes.


G?khan


On Fri, May 22, 2009 at 9:43 AM, David Robinow <drobinow at gmail.com> wrote:

> On Fri, May 22, 2009 at 10:27 AM, G?khan SEVER <gokhansever at gmail.com>
> wrote:
> ...
> > serialc = np.loadtxt(sys.argv[1], skiprows=skiprows).T
> > for i in range(20):
> >     locals()['serialc_bin' + str(i+1)] = serialc[i+4]
> >
> > I don't know easier way than using locals() to construct variable-like
> > identities in my program.
>
> I don't either.  I also don't know why you feel you need to construct
> variable-like identities.
> Why is:
>  serialc_bin1
> better than
>  serialc_bin[0]
> or, for that matter,
>  serialc[4]
>
> ???
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From GDoermann at gmail.com  Fri May 22 11:00:57 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Fri, 22 May 2009 08:00:57 -0700 (PDT)
Subject: Python Socket Issues with VirtualBox
Message-ID: <45133930-0502-44fb-9d9b-83d22159e6f0@u9g2000pre.googlegroups.com>

I have created a server and client that communicate via a TCP socket
connection.  Everything runs great on 6 of the 6 boxes.  However, when
I installed Sun's VirtualBox on one of the PC's I started getting:
error: (10061, 'Connection refused')

I tried restarting, stopping services, checking out a new copy of the
code, changing ports, changing host names... all fails until I remove
VirtualBox.  I would REALLY like to be able to have both working.  Any
idea what might be causing this and how I could fix it?

Thanks,

Greg


From alan.franzoni.xyzz at gmail.com  Fri May 22 11:05:42 2009
From: alan.franzoni.xyzz at gmail.com (Alan Franzoni)
Date: Fri, 22 May 2009 15:05:42 GMT
Subject: Python Socket Issues with VirtualBox
References: <45133930-0502-44fb-9d9b-83d22159e6f0@u9g2000pre.googlegroups.com>
Message-ID: <1m9rekec3z2d3$.1j7hcy0d7aaei$.dlg@40tude.net>

TechieInsights was kind enough to say:

[cut]

You're giving very few details on your issue, which is most probably not
related to python itself. Which operating system? Which virtualbox version?
Which kind of connection? Is the port open for listen? Does the code fail
at listening or at connecting (e.g. is either the client or the server
failing) ?

My first guess would be that you didn't specify the interface to bind to,
and the interface order changes once you install virtualbox since it
possibly adds a virtual interface of its own, but I can't tell unless you
tell something more.

-- 
Alan Franzoni <alan.franzoni.xyzz at gmail.com>
-
Remove .xyzz from my email in order to contact me.
-
GPG Key Fingerprint:
5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E


From aahz at pythoncraft.com  Fri May 22 11:14:13 2009
From: aahz at pythoncraft.com (Aahz)
Date: 22 May 2009 08:14:13 -0700
Subject: python3 module for dbus ?
References: <4a1281ef$0$90271$14726298@news.sunsite.dk>
	<guuojl$l9g$1@panix3.panix.com>
	<4a15b88c$0$90265$14726298@news.sunsite.dk>
Message-ID: <gv6fg5$5og$1@panix3.panix.com>

In article <4a15b88c$0$90265$14726298 at news.sunsite.dk>,
Timothy Madden  <terminatorul at gmail.com> wrote:
>Aahz wrote:
>> In article <4a1281ef$0$90271$14726298 at news.sunsite.dk>,
>> Timothy Madden  <terminatorul at gmail.com> wrote:
>[...]
>>> Do you know if I can get dbus bindings for python3 and glib bindings for 
>>> python3 ? Or could I use them otherwise (like without the modules) ?
>> 
>> Sorry, no answers to your questions off-hand, but what's wrong with
>> using 2.x?
>
>It is now old and will be replaced by 3.0

That is only half-true -- Python 2.x will be a live project for at least
another couple of years and I bet that 3.x will not overtake 2.x for at
least three years (which is probably also the point at which no new
projects will be started in 2.x).  2.x is not "now old".

>And I am starting a new project. I think it would be appropriate to 
>start it with the new version of python.

Well, you're running right into one of the main reasons many people
advocate sticking with 2.x for now.  Unless you can come up with better
reasons for thinking that 2.x is wrong, I suggest you start your project
with 2.x; it should be easy to upgrade to 3.x when the library support is
available.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From jcd at sdf.lonestar.org  Fri May 22 11:21:06 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 22 May 2009 11:21:06 -0400
Subject: While Statement
In-Reply-To: <4A16AFC9.90302@ieee.org>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
	<mailman.571.1242984862.8015.python-list@python.org>
	<00325a9c$0$9685$c3e8da3@news.astraweb.com>
	<6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>
	<1242994776.8046.137.camel@tim-laptop>  <4A16AFC9.90302@ieee.org>
Message-ID: <1243005666.3385.13.camel@aalcdl07>

On Fri, 2009-05-22 at 09:59 -0400, Dave Angel wrote:
> 
> Tim Wintle wrote:
> > On Fri, 2009-05-22 at 13:19 +0200, Andre Engels wrote:
> >   
> >> number/total = 998/999 = 0
> >> number/total*100 = 0*100 = 0
> >> float(number/total*100) = float(0) = 0.0
> >>
> >> Change "float(number/total*100)" to "float(number)/total*100" and it
> >> should work:
> >>     
> >
> > I'd use:
> >
> >  (number * 100.)/total
> >
> > - works because
> >  <int> * <float> => <float> 
> >
> > It's a minor thing, but it's much faster to cast implicitly as you miss
> > the python function call overhead - it's no extra work to write, and for
> > numerical things it can really speed things up.
> >
> >   
> >>>> a = timeit.Timer("float(200)/5*100")
> >>>> b = timeit.Timer("(200*100.)/5")
> >>>> a.timeit(10000000)
> >>>>         
> > 12.282480955123901
> >   
> >>>> b.timeit(10000000)
> >>>>         
> > 3.6434230804443359
> >
> > Tim W
> >
> >
> >
> >   
> It's the old-timer in me, but I'd avoid the float entirely.  You start 
> with ints, and you want to end with ints.  So simply do the multiply 
> first, then the divide.
> 
>  number * 100/total
> 
> will get the same answer.
> 

Also, to get the same behavior (faster integer division) in python 3 or
when using `from __future__ import division`, use the // division
operator instead of /.

In fact, a little experimentation shows that you get the speedup even
when using python 2.6 with old-style division.  Probably because python
doesn't have to check the types of its arguments before deciding to do
integer division.

>>> a = timeit.Timer("(200 * 100.)/5")
>>> b = timeit.Timer("(200 * 100)/5")
>>> c = timeit.Timer("(200 * 100)//5")
>>> d = timeit.Timer("(200 * 100.0)//5")
>>> for each in a, b, c, d:
...     each.timeit(22222222)
... 
2.3681092262268066
2.417525053024292
0.81031703948974609
0.81548619270324707


Cheers,
Cliff






From steve at REMOVE-THIS-cybersource.com.au  Fri May 22 11:29:16 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 22 May 2009 15:29:16 GMT
Subject: When does the escape character work within raw strings?
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
Message-ID: <00329f36$0$9725$c3e8da3@news.astraweb.com>

On Fri, 22 May 2009 07:47:49 -0700, walterbyrd wrote:

> On May 21, 9:44?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> 
>> Escaping the delimiting quote is the *one* time backslashes have a
>> special meaning in raw string literals.
> 
> If that were true, then wouldn't r'\b' be treated as two characters?

It is.

>>> len(r'\b')
2



>> This calls re.sub with a pattern string object that contains two
>> characters, a backslash followed by an 'n'. ?This combination *does*
>> have a special meaning to the sub function, which does it's own
>> translation of the pattern into a single newline character.
> 
> So when do I know when a raw string is treated as a raw string, and when
> it's not?

You have misunderstood. All strings are strings, but there are different 
ways to build a string. Raw strings are not different from ordinary 
strings, they're just a different way to *build* an ordinary string.

Here are four ways to make the same string, a backslash followed by a 
lowercase b:

"\\b"        # use an ordinary string, and escape the backslash
chr(92)+"b"  # use the chr() function
"\x5cb"      # use a hex escape
r"\b"        # use a raw string, no escaping needed

The results you get from all of those (and many, many more!) are the same 
string object. They're just written differently as source code.

Now, in regular expressions, the RE engine expects to see special codes 
inside the string that have special meanings. For example, backslash 
followed by lowercase B has a special meaning. So to create a string 
containing that regex, you can use any of the above (or any of the 
others). The RE engine doesn't know, and can't know, how you generated 
the regex. All it sees is a string containing a backslash followed by 
lowercase-B.

But if you forget that Python uses backslash escapes in strings, and just 
write "\b", then the compiler creates the string chr(8) (BEL), which has 
no special meaning to the RE engine.


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May 22 11:34:09 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 22 May 2009 15:34:09 GMT
Subject: When does the escape character work within raw strings?
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
	<00329f36$0$9725$c3e8da3@news.astraweb.com>
Message-ID: <0032a05c$0$9725$c3e8da3@news.astraweb.com>

On Fri, 22 May 2009 15:29:16 +0000, Steven D'Aprano wrote:

> But if you forget that Python uses backslash escapes in strings, and
> just write "\b", then the compiler creates the string chr(8) (BEL),
> which has no special meaning to the RE engine.

Correction: \b is BACKSPACE, not BELL. \a is BELL.



-- 
Steven


From google at mrabarnett.plus.com  Fri May 22 11:43:35 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 22 May 2009 16:43:35 +0100
Subject: When does the escape character work within raw strings?
In-Reply-To: <00329f36$0$9725$c3e8da3@news.astraweb.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>	<mailman.459.1242842772.8015.python-list@python.org>	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>	<mailman.554.1242963859.8015.python-list@python.org>	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
	<00329f36$0$9725$c3e8da3@news.astraweb.com>
Message-ID: <4A16C827.7080900@mrabarnett.plus.com>

Steven D'Aprano wrote:
[snip]
> But if you forget that Python uses backslash escapes in strings, and just 
> write "\b", then the compiler creates the string chr(8) (BEL), which has 
> no special meaning to the RE engine.
> 
"\b" or chr(8) is BS (backspace); "\a" or chr(7) is BEL (bell).


From jcd at sdf.lonestar.org  Fri May 22 11:44:13 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 22 May 2009 11:44:13 -0400
Subject: Question about locals()
In-Reply-To: <49d6b3500905220800r3fff1748h822315acb8effa29@mail.gmail.com>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
	<49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>
	<op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>
	<49d6b3500905220727i265f3eb8q8482ded1d79c03f4@mail.gmail.com>
	<4eb0089f0905220743v6f4c5b67n4b43dd742b3bc1b9@mail.gmail.com>
	<49d6b3500905220800r3fff1748h822315acb8effa29@mail.gmail.com>
Message-ID: <1243007053.3385.32.camel@aalcdl07>

Top-posting corrected.

On Fri, 2009-05-22 at 10:00 -0500, G?khan SEVER wrote:

> On Fri, May 22, 2009 at 9:43 AM, David Robinow <drobinow at gmail.com>
> wrote:
>         On Fri, May 22, 2009 at 10:27 AM, G?khan SEVER
>         <gokhansever at gmail.com> wrote:
>         ...
>         > serialc = np.loadtxt(sys.argv[1], skiprows=skiprows).T
>         > for i in range(20):
>         >     locals()['serialc_bin' + str(i+1)] = serialc[i+4]
>         >
>         > I don't know easier way than using locals() to construct
>         variable-like
>         > identities in my program.
>         
>         
>         I don't either.  I also don't know why you feel you need to
>         construct
>         variable-like identities.
>         Why is:
>          serialc_bin1
>         better than
>          serialc_bin[0]
>         or, for that matter,
>          serialc[4]
>         
>         ???
>         
>         --
>         http://mail.python.org/mailman/listinfo/python-list
>         

> Because in this case serialc is an numpy array. Since loadtxt returns
> a numpy-array. Furthermore 
> 
> locals()['serialc_bin' + str(i+1)]  creates a dictionary key (that's
> what I use the term "variable-like") serialc_bin1, serialc_bin2, ...
> not serialc_bin[0] with indexes. 
> 
> 
> G?khan
> 
> 

I'm not sure why dictionary keys are better than indexes in your
example, especially as they're being created by coercing integers to
strings.  However, that's your business.  But why not just create your
own dictionary.  Then you can pass the results around easily as a group
or one at a time, and you don't have to mess in locals() (which isn't
supposed to be messed in).  It also gives you more flexibility as to how
you name your entries:

d = {}

You can use the same indexes you're using now:

d['serialc_bin' + str(i+1)] = serialc[i+4]

or you can keep the integerness of i by using tuples as keys (thus
preserving sort order across your keys):

d[('serialc_bin', i+1)] = serialc[i+4]

or you can use the integer as a key by itself (yes!  It looks like
you're accessing a list, but it's actually a dict with integer keys):

d[i+1] = serialc[i+4]

Or you can use a dict with a more descriptive name and the last above
solution gains the readability of your initial solution:

serialc_bin = {}
serialc_bin[i+1] = serialc[i+4]

Finally, if there's more you want to do with these numbers, you can
create a class to hold them.  Then as you need to, you can add methods
to it to implement the behavior you're looking for.

class MyCollection(object):
    """Untested code"""

    def __init__(self):
        self._store = {}

    def __getitem__(self, item):
        return self._store[item]

    def __setitem__(self, item, value):
        self._store[item] = value

    def __delitem__(self, item):
        del(self._store[item])

    def sum(self):
        total = 0
        for value in self._store.values():
            total += value
        return value

serialc_bin = MyCollection()
for i, value in enumerate(serialc):
    serialc_bin[i+1] = value
print serialc_bin.sum()

Any one of these seems like a better idea to me than trying to pollute
your local namespace with an unknown number of variables.  You have a
collection of objects.  It makes sense to store them in one of python's
collection types, or create an object of your own to store them.

Cheers,
Cliff




From drobinow at gmail.com  Fri May 22 11:52:48 2009
From: drobinow at gmail.com (David Robinow)
Date: Fri, 22 May 2009 11:52:48 -0400
Subject: Question about locals()
In-Reply-To: <49d6b3500905220800r3fff1748h822315acb8effa29@mail.gmail.com>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
	<49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>
	<op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>
	<49d6b3500905220727i265f3eb8q8482ded1d79c03f4@mail.gmail.com>
	<4eb0089f0905220743v6f4c5b67n4b43dd742b3bc1b9@mail.gmail.com>
	<49d6b3500905220800r3fff1748h822315acb8effa29@mail.gmail.com>
Message-ID: <4eb0089f0905220852l4c84fc5ckf38bc62b079b8836@mail.gmail.com>

On Fri, May 22, 2009 at 11:00 AM, G?khan SEVER <gokhansever at gmail.com> wrote:
> Because in this case serialc is an numpy array. Since loadtxt returns a
> numpy-array. Furthermore
>
> locals()['serialc_bin' + str(i+1)]? creates a dictionary key (that's what I
> use the term "variable-like") serialc_bin1, serialc_bin2, ... not
> serialc_bin[0] with indexes.

A name (or variable as you call it) is not a dictionary key. The
contents of the name may be.
A list can not be a dictionary key. However, a list element can be (or
not, if the element itself is mutable)
You gain nothing by creating all these names.


From paul at boddie.org.uk  Fri May 22 11:57:58 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Fri, 22 May 2009 08:57:58 -0700 (PDT)
Subject: Python Socket Issues with VirtualBox
References: <45133930-0502-44fb-9d9b-83d22159e6f0@u9g2000pre.googlegroups.com>
	<1m9rekec3z2d3$.1j7hcy0d7aaei$.dlg@40tude.net>
Message-ID: <d916e593-d165-4b44-88b0-7848f55f7ec7@y9g2000yqg.googlegroups.com>

On 22 Mai, 17:05, Alan Franzoni <alan.franzoni.x... at gmail.com> wrote:
>
> My first guess would be that you didn't specify the interface to bind to,
> and the interface order changes once you install virtualbox since it
> possibly adds a virtual interface of its own, but I can't tell unless you
> tell something more.

If a request is made to bind a socket to "" as is often indicated in
examples, I believe that an attempt is then made to bind the socket to
all available interfaces, and I can imagine that this might not work
for any special interfaces created for VirtualBox. See here for more
information:

http://docs.python.org/library/socket.html#example

Paul


From daniel.watrous at gmail.com  Fri May 22 12:19:29 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Fri, 22 May 2009 09:19:29 -0700 (PDT)
Subject: package questions
Message-ID: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>

Hello,

I've posted about this before, but after reading the docs, I have a
few more questions
here are the docs: http://docs.python.org/tutorial/modules.html#packages
here is my previous post:
http://groups.google.com/group/comp.lang.python/browse_thread/thread/3a352159f6828eb9/cda8395d36827d20

I've setup some directories for the sound package, exactly as shown in
the examples in the docs.  In the surround file I put the lines

from . import echo
from .. import formats
from ..filters import equalizer

again, exactly as in the docs.  When I run surround.py, I get the
following result:
C:\sound\effects>python surround.py
Traceback (most recent call last):
  File "surround.py", line 1, in <module>
    from . import echo
ValueError: Attempted relative import in non-package

C:\sound\effects>

Why doesn't this work as suggested in the docs.  The only way that I
found to get around this is to add directories to the path, but I
can't help but think that it shouldn't be necessary to modify the path
for packages to work.

Just to be sure, here are directory listings showing the I have the
__init__.py files in place

C:\sound\effects>dir
 Volume in drive C is Default
 Volume Serial Number is 8CD7-71F6

 Directory of C:\sound\effects

05/22/2009  10:07 AM    <DIR>          .
05/22/2009  10:07 AM    <DIR>          ..
05/22/2009  10:06 AM                 0 echo.py
05/22/2009  10:16 AM               189 surround.py
05/22/2009  10:04 AM                 0 __init__.py
               3 File(s)            189 bytes
               2 Dir(s)  50,860,060,672 bytes free

C:\POP\sound\effects>dir ..\
 Volume in drive C is Default
 Volume Serial Number is 8CD7-71F6

 Directory of C:\sound

05/22/2009  10:04 AM    <DIR>          .
05/22/2009  10:04 AM    <DIR>          ..
05/22/2009  10:07 AM    <DIR>          effects
05/22/2009  10:06 AM    <DIR>          filters
05/22/2009  10:04 AM    <DIR>          formats
05/22/2009  10:04 AM                 0 __init__.py
               1 File(s)              0 bytes
               5 Dir(s)  50,859,077,632 bytes free

C:\sound\effects>dir ..\filters
 Volume in drive C is Default
 Volume Serial Number is 8CD7-71F6

 Directory of C:\sound\filters

05/22/2009  10:06 AM    <DIR>          .
05/22/2009  10:06 AM    <DIR>          ..
05/22/2009  10:06 AM                 0 equalizer.py
05/22/2009  10:04 AM                 0 __init__.py
               2 File(s)              0 bytes
               2 Dir(s)  50,859,077,632 bytes free

Please share any feedback.  Thanks.


From alan.isaac at gmail.com  Fri May 22 12:38:40 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Fri, 22 May 2009 16:38:40 GMT
Subject: define "generator" (glossary bug?)
Message-ID: <kyARl.22$Cc1.9@nwrddc01.gnilink.net>

I believe the glossary
http://wiki.python.org/moin/PythonGlossary
is missing the definition for 'generator'
and has used instead the definition for 'generator function',
which term is missing from the glossary.

Standard usage as I understand it is found here:
http://docs.python.org/3.0/reference/simple_stmts.html#the-yield-statement

Cheers,
Alan Isaac


From exarkun at divmod.com  Fri May 22 13:07:57 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Fri, 22 May 2009 13:07:57 -0400
Subject: define "generator" (glossary bug?)
In-Reply-To: <kyARl.22$Cc1.9@nwrddc01.gnilink.net>
Message-ID: <20090522170757.21531.624524680.divmod.quotient.24523@henry.divmod.com>

On Fri, 22 May 2009 16:38:40 GMT, Alan G Isaac <alan.isaac at gmail.com> wrote:
>I believe the glossary
>http://wiki.python.org/moin/PythonGlossary
>is missing the definition for 'generator'
>and has used instead the definition for 'generator function',
>which term is missing from the glossary.
>
>Standard usage as I understand it is found here:
>http://docs.python.org/3.0/reference/simple_stmts.html#the-yield-statement
>

Well, it seems someone edited the wiki since you sent your message, since
there is no longer an entry for "generator function", but instead one for
"generator".

However, I think it was right before.  Consider:

def foo():
    yield

Now, is `foo? a generator?  If so, what is `foo()??

With the "generator function"/"generator" terminology, it is unambiguous
to say "`foo? is a generator function and `foo()? is a generator".

Jean-Paul


From aahz at pythoncraft.com  Fri May 22 13:26:41 2009
From: aahz at pythoncraft.com (Aahz)
Date: 22 May 2009 10:26:41 -0700
Subject: Cursor movement question
References: <3cmRl.90415$iW4.57403@en-nntp-01.dc1.easynews.com>
	<wxoRl.328387$Yx2.227908@en-nntp-06.dc1.easynews.com>
Message-ID: <gv6n8h$olu$1@panix3.panix.com>

In article <wxoRl.328387$Yx2.227908 at en-nntp-06.dc1.easynews.com>,
Jive Dadson  <notontheweb at noisp.com> wrote:
>
>Gosh, you guys are slow. :-) I figured it out.

Perhaps you could post the solution for posterity's sake?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From alan.isaac at gmail.com  Fri May 22 13:27:47 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Fri, 22 May 2009 17:27:47 GMT
Subject: define "generator" (glossary bug?)
In-Reply-To: <mailman.596.1243012080.8015.python-list@python.org>
References: <mailman.596.1243012080.8015.python-list@python.org>
Message-ID: <ngBRl.30$Cc1.16@nwrddc01.gnilink.net>

> On Fri, 22 May 2009 16:38:40 GMT, Alan G Isaac <alan.isaac at gmail.com> 
> wrote:
>> I believe the glossary
>> http://wiki.python.org/moin/PythonGlossary
>> is missing the definition for 'generator'
>> and has used instead the definition for 'generator function',
>> which term is missing from the glossary.
>>
>> Standard usage as I understand it is found here:
>> http://docs.python.org/3.0/reference/simple_stmts.html#the-yield-statement 


On 5/22/2009 1:07 PM Jean-Paul Calderone apparently wrote:
> Well, it seems someone edited the wiki since you sent your message, since
> there is no longer an entry for "generator function", but instead one for
> "generator".
> 
> However, I think it was right before. 


Nope, it is still the same, and that is the problem.
(My "which term" refered to 'generator function'.)

So you agree: it is a documentation bug in the glossary.

Alan Isaac


From Scott.Daniels at Acm.Org  Fri May 22 13:29:29 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 22 May 2009 10:29:29 -0700
Subject: package questions
In-Reply-To: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>
References: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>
Message-ID: <oqydnaGChug1QovXnZ2dnUVZ_qidnZ2d@pdx.net>

Daniel wrote:
> Hello,
> 
> I've posted about this before, but after reading the docs, I have a
> few more questions
> here are the docs: http://docs.python.org/tutorial/modules.html#packages
> here is my previous post:
> http://groups.google.com/group/comp.lang.python/browse_thread/thread/3a352159f6828eb9/cda8395d36827d20
> 
> I've setup some directories for the sound package, exactly as shown in
> the examples in the docs.  In the surround file I put the lines
> 
> from . import echo
> from .. import formats
> from ..filters import equalizer
> 
> again, exactly as in the docs.  When I run surround.py, I get the
> following result:
> C:\sound\effects>python surround.py
> Traceback (most recent call last):
>   File "surround.py", line 1, in <module>
>     from . import echo
> ...
(1) You really should identify your OS and Python version.  I am fairly
certain it is some form of Windows, but ....
Try something like:
     C:\sound\effects> cd C:\
     C:\> python -m sound.effects.surround

(2) you can run
     python -v surround.py
or
     python -vv surround.py
To see files opened (or attempted and opened for -vv) in order to
discover what exactly is tried and in what order on imports.
Warning: the output is huge.

--Scott David Daniels
Scott.Daniels at Acm.Org




From rhodri at wildebst.demon.co.uk  Fri May 22 13:34:34 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 18:34:34 +0100
Subject: Adding a Par construct to Python?
In-Reply-To: <f21b5b47-20ec-4d01-aecf-123b45facc8b@l28g2000vba.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
	<16b51c17-b293-461e-8e87-efed1d35e5ba@o30g2000vbc.googlegroups.com>
	<mailman.555.1242965876.8015.python-list@python.org>
	<f21b5b47-20ec-4d01-aecf-123b45facc8b@l28g2000vba.googlegroups.com>
Message-ID: <op.uucdrwyqa8ncjz@gnudebst>

On Fri, 22 May 2009 10:27:21 +0100, <jeremy at martinfamily.freeserve.co.uk>  
wrote:

> I think this depends on whether we think that Python is a language for
> people who we trust to know what they are doing (like Perl) or whether
> it is a language for people we don't trust to get things right(like
> Java). I suspect it probably lies somewhere in the middle.

So do I *in general*, but your design principle -- make it easy -- came
down firmly in the first camp and, as I said, I come down in the second
where parallel processing is concerned.  I've spent enough years weeding
bugs out of my insufficiently carefully designed Occam programs to have
the opinion that "easy" is the very last thing you want to make it.

> Actually the 'sync' command could lead to deadlock potentially:
>
> par i in range(2):
>     if i == 1:
>         sync

Hmm.  I was assuming you had some sort of implicit rendez-vous sync
at the end of the PAR.  Yes, this does make it very easy for the
freshly-enabled careless programmer to introduce deadlocks and
never realise it.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From skip at pobox.com  Fri May 22 13:44:30 2009
From: skip at pobox.com (skip at pobox.com)
Date: Fri, 22 May 2009 12:44:30 -0500
Subject: define "generator" (glossary bug?)
In-Reply-To: <ngBRl.30$Cc1.16@nwrddc01.gnilink.net>
References: <mailman.596.1243012080.8015.python-list@python.org>
	<ngBRl.30$Cc1.16@nwrddc01.gnilink.net>
Message-ID: <18966.58494.300882.479428@montanaro.dyndns.org>

    >>> I believe the glossary
    >>> http://wiki.python.org/moin/PythonGlossary
    >>> is missing the definition for 'generator'
    >>> and has used instead the definition for 'generator function',
    >>> which term is missing from the glossary.
    >>> 
    >>> Standard usage as I understand it is found here:
    >>> http://docs.python.org/3.0/reference/simple_stmts.html#the-yield-statement 

Note that the glossary page is on the wiki.  Feel free to make corrections.

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/
    America's vaunted "free press" notwithstanding, story ideas that expose
    the unseemly side of actual or potential advertisers tend to fall by the
    wayside.  Not quite sure why.  -- Jim Thornton


From jan.plaza at plattsburgh.edu  Fri May 22 13:54:59 2009
From: jan.plaza at plattsburgh.edu (Jan)
Date: Fri, 22 May 2009 10:54:59 -0700 (PDT)
Subject: reseting an iterator
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
	<mailman.583.1242999993.8015.python-list@python.org>
Message-ID: <bb616d71-b612-4b29-9da3-f5eda5acd834@z5g2000vba.googlegroups.com>

On May 22, 9:46?am, "J. Cliff Dyer" <j... at sdf.lonestar.org> wrote:

> You don't need a reset method. ?There is no hard and fast rule that
> __iter__ must return the object itself. ?It just needs to return an
> iterator. ?

I disagree.
If ITRATOR is a true iterator, ITRATOR.__iter__() must return
ITERATOR.
If ITERABLE is an iterable (but not necessarily an iterator)
ITRABLE.__iter__() must return an iterator.

> For example:
>
> >>> l = [1,2,3]
> >>> l.__iter__()
>
> <listiterator object at 0x7fd0da315850>>>> l is l.__iter__()
>
> False

[1,2,3] is an iterable but not an iterator, so this False result is
expected.
Compare this with the following.

>>> ii = iter([1,2,3])  # ii is an iterator.
>>> next(ii)
1
>>> jj = ii.__iter__() # call __iter__ method on an iterator
>>> ii is jj
True
>>> next(jj)
2

> Just create a class with an __iter__ method that returns a reset
> iterator object.
>
> class X(object):
> ? ? def __init__(self, max=3):
> ? ? ? ? self.counter = 0
> ? ? ? ? self.max = max
> ? ? def __iter__(self):
> ? ? ? ? return self
> ? ? def next(self):
> ? ? ? ? if self.counter < self.max:
> ? ? ? ? ? ? self.counter += 1
> ? ? ? ? ? ? return self.counter
> ? ? ? ? else:
> ? ? ? ? ? ? raise StopIteration
>
> class Y(object):
> ? ? def __iter__(self):
> ? ? ? ? return X()
>
> In this setup, X has the problem you are trying to avoid, but Y behaves
> as a resettable iterable.

> y = Y()

This does not work.

With this, y is not an interator, and not even an iterable.

> for c in y:

This produces an error because by definition of for-loops
it is executed the same way as:

temp_iterator = iter(y) # temp_iterator is y
while True:
    try:
        print(next(temp_iterator)) # temp_iterator does not support
__next__()
    except StopIteration:
        break

Jan


From rhodri at wildebst.demon.co.uk  Fri May 22 14:03:04 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 19:03:04 +0100
Subject: defaultdict's bug or feature?
In-Reply-To: <3f18b3f10905220153u57016ddby3e31ada91630da0d@mail.gmail.com>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
	<op.uua0bujla8ncjz@gnudebst>
	<3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
	<op.uubdppr7a8ncjz@gnudebst>
	<3f18b3f10905220153u57016ddby3e31ada91630da0d@mail.gmail.com>
Message-ID: <op.uuce3epla8ncjz@gnudebst>

I asked you not to top-post.  Please put your replies *below* the
messages you're quoting, not above.  It's much easier to understand
the conversation that we're having if you do that, and much more
aggravating if you don't.

On Fri, 22 May 2009 09:53:04 +0100, Red Forks <redforks at gmail.com> wrote:

> Yes, you maybe right. When use defaultdict, should not rely get() method
> anymore, d[] is just enough.

Almost.  You should rely on get() to do what it says, not what you think
it should do.  That's generally true, by the way; when the Fine Manual
says that a class, function or method will do one thing, expecting it to
do something else is unreasonable.

> Actually, I steal defaultdict to do other things:
>
> class OnloadDict(defaultdict):
>     def __init__(self, onload):
>         self.__onload = onload
>
>     def __missing__(self, key):
>         result = self.__onload(key)
>         if not result:
>             raise KeyError
>
>         self[key] = result
>         return result
>
>     def get(self, key, default = None):
>         ''' defaultdict.get() won't call __missing__, so override '''
>         try:
>             return self[key]
>         except KeyError:
>             return default
>
> OnloadDict, is like a cache. When the value is not in dict, using  
> 'onload'
> function to load the value by the key.
> When no value correspond to a key, a KeyError will raised. So I need a
> *safer* version 'get()' method.

Why are you so determined to (ab)use get() on your class?  You should
only be calling OnloadDict.get() if you really mean "get me the value
associated with this key, or the default I'm telling you about *right*
*now* if there isn't one."

Aside from that, this is neat.  Strictly you should call
defaultdict.__init__(self) in your __init__() function just in case
defaultdict needs any setup that you aren't doing (which it does, but
you override __missing__() so it never notices that it doesn't have
a default_factory).  You get away with it here, but it's not a good
habit to get into.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Fri May 22 14:22:49 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 19:22:49 +0100
Subject: When does the escape character work within raw strings?
In-Reply-To: <8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
Message-ID: <op.uucf0bara8ncjz@gnudebst>

On Fri, 22 May 2009 15:47:49 +0100, walterbyrd <walterbyrd at iname.com>  
wrote:

> On May 21, 9:44?pm, "Rhodri James" <rho... at wildebst.demon.co.uk>
> wrote:
>
>> Escaping the delimiting quote is the *one* time backslashes have a
>> special meaning in raw string literals.
>
> If that were true, then wouldn't r'\b' be treated as two characters?

It is.

>>> len(r'\b')
2

>> This calls re.sub with a pattern string object that contains two
>> characters, a backslash followed by an 'n'. ?This combination *does*
>> have a special meaning to the sub function, which does it's own
>> translation of the pattern into a single newline character. ?
>
> So when do I know when a raw string is treated as a raw string, and
> when it's not?

A raw string LITERAL is always treated as a raw string LITERAL when
the Python interpreter turns it into a string OBJECT.  I used the
capitalised words very deliberately and precisely, yet you seem to
have managed to conflate them again.  Please don't.  How the literal
is interpreted is up to the Python interpreter.  How the object is
interpreted is up to the thing doing the interpretation, in this
case the re.sub() function.

How do you know how a string object is going to be treated by any
given function?  Read the Fine Manual for that function.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From daniel.watrous at gmail.com  Fri May 22 14:29:24 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Fri, 22 May 2009 11:29:24 -0700 (PDT)
Subject: package questions
References: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>
	<oqydnaGChug1QovXnZ2dnUVZ_qidnZ2d@pdx.net>
Message-ID: <ca1c608f-1d62-468b-865c-b9ae7ce2ed37@s31g2000vbp.googlegroups.com>

On May 22, 11:29?am, Scott David Daniels <Scott.Dani... at Acm.Org>
wrote:
> Daniel wrote:
> > Hello,
>
> > I've posted about this before, but after reading the docs, I have a
> > few more questions
> > here are the docs:http://docs.python.org/tutorial/modules.html#packages
> > here is my previous post:
> >http://groups.google.com/group/comp.lang.python/browse_thread/thread/...
>
> > I've setup some directories for the sound package, exactly as shown in
> > the examples in the docs. ?In the surround file I put the lines
>
> > from . import echo
> > from .. import formats
> > from ..filters import equalizer
>
> > again, exactly as in the docs. ?When I run surround.py, I get the
> > following result:
> > C:\sound\effects>python surround.py
> > Traceback (most recent call last):
> > ? File "surround.py", line 1, in <module>
> > ? ? from . import echo
> > ...
>
> (1) You really should identify your OS and Python version. ?I am fairly
> certain it is some form of Windows, but ....
> Try something like:
> ? ? ?C:\sound\effects> cd C:\
> ? ? ?C:\> python -m sound.effects.surround
>
> (2) you can run
> ? ? ?python -v surround.py
> or
> ? ? ?python -vv surround.py
> To see files opened (or attempted and opened for -vv) in order to
> discover what exactly is tried and in what order on imports.
> Warning: the output is huge.
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

I'm on WinXP using Python 2.5  Sorry I didn't mention that at first.

C:\sound\effects>cd ..\..\

C:\>python -m sound.effects.surround
Traceback (most recent call last):
  File "C:\Python25\lib\runpy.py", line 95, in run_module
    filename, loader, alter_sys)
  File "C:\Python25\lib\runpy.py", line 52, in _run_module_code
    mod_name, mod_fname, mod_loader)
  File "C:\Python25\lib\runpy.py", line 32, in _run_code
    exec code in run_globals
  File "C:\POP\sound\effects\surround.py", line 5, in <module>
    from . import echo
ValueError: Attempted relative import in non-package

Do you want me to post the output from the -vv.  I couldn't see that
it actually tried to load it.  Here's a relevant portion (I think):
# C:\Python25\lib\linecache.pyc matches C:\Python25\lib\linecache.py
import linecache # precompiled from C:\Python25\lib\linecache.pyc
Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
Traceback (most recent call last):
  File "surround.py", line 1, in <module>
    from . import echo
ValueError: Attempted relative import in non-package
# clear __builtin__._

It appears to finish loading everything for python and then
immediately fails due to the import call.


From rhodri at wildebst.demon.co.uk  Fri May 22 14:38:30 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 19:38:30 +0100
Subject: ffmpeg and python big problem
In-Reply-To: <819491b7-67b3-446e-b77e-9553b55da9d8@e21g2000yqb.googlegroups.com>
References: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>
	<mailman.546.1242952690.8015.python-list@python.org>
	<819491b7-67b3-446e-b77e-9553b55da9d8@e21g2000yqb.googlegroups.com>
Message-ID: <op.uucgqgsja8ncjz@gnudebst>

On Fri, 22 May 2009 13:54:26 +0100, TerabyteST <gabrycir at gmail.com> wrote:

> Could you give me a link to a version that "works"?

Not with any confidence.  The ffmpeg website (http://www.ffmpeg.org)
has a link to this page (http://ffmpeg.arrozcru.org/) which seems to
have binaries on it, but I don't use Windows so I have no idea if
they actually work or not.

> For putting the data in the stream I save bmp stills from the webcam
> and then use the write function giving the name of the file.

You don't believe in making life easy for yourself, do you? :-)
Why are you turning stills into a video anyway?  Wouldn't it be easier
to save the webcam output as video (whatever format it claims to be)
and get ffmpeg to work on it directly?

> @Emile: if I can access MEncoder from python and give it the images
> one by one, using a stream like i'm doing in ffmpeg, or telling it a
> sequence to make a video from, I could try it.

You seem to have emailed me directly, not the list.  I've copied this
back to the list so Emile can see it too.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From robert.kern at gmail.com  Fri May 22 15:06:44 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 22 May 2009 14:06:44 -0500
Subject: Looking for module for shrinking a list with n-point means
In-Reply-To: <eP6dnSX_2dDcMYvXnZ2dnUVZ_v2dnZ2d@pdx.net>
References: <64997d17-9811-4fb1-a729-c80dd9fbcd9a@g22g2000pra.googlegroups.com>
	<eP6dnSX_2dDcMYvXnZ2dnUVZ_v2dnZ2d@pdx.net>
Message-ID: <gv6t44$f04$1@ger.gmane.org>

On 2009-05-22 08:50, Scott David Daniels wrote:
> Yash Ganthe wrote:
>> I would like to shrink a large list in the following way:
>> If the List has 1000 integers, we need only 100 averages such that the
>> 1000 points are average for every 10 consecutive values. So p0 to p9
>> will be averaged to obtain t0. p10 to p19 will be averaged to obtain
>> t1 and so on. This is a 10-point mean.
>>
>> We are doing this as we collect a lot of data and plot it on a graph.
>> Too many samples makes the graph cluttered. So we need to reduce the
>> number of values in the way described above.
>
> Does this give you a clue?
>
> import numpy as np
>
> v = np.arange(128)
> v.shape = (16, 8)
> sum(v.transpose()) / 8.

Or even:

import numpy as np

v = np.arange(1000).reshape((-1, 10))
ten_point_mean = v.mean(axis=1)

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From atagar1 at gmail.com  Fri May 22 15:06:57 2009
From: atagar1 at gmail.com (Damian Johnson)
Date: Fri, 22 May 2009 12:06:57 -0700
Subject: Curses Subwin Resizing
Message-ID: <b89309180905221206m19ce6798uc48449b111c44999@mail.gmail.com>

Hi, I've been trying to make a curses application that's resilient to having
the terminal resized (like 'top'). I've managed to make it capable of
adjusting when the screen's width is changed (using getmaxyx) but changing
the height is proving a little trickier. I'm using subwindows so I can
selectively clear and redraw portions of the screen, however whenever the
screen's height is reduced it permanently shrinks (and moves) displaced
subwindows, so it can't recover when the screen's enlarged again. I've been
looking for hours for any of the following that would fix the problem...
... the ability to move and resize subwindows so I can restore them.
... the ability to delete subwindows so I can just receate them.
... the ability to selectively clear a rectangular region so I don't need
subwindows at all (I've spotted character deletion, but not region and it
seems kinda funky to tell curses to clear each cell individually).

This seems like it's probably a common problem but I haven't spotted a
solution. Any help would be appreciated! -Damian
-------------- next part --------------
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From dickinsm at gmail.com  Fri May 22 16:05:59 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Fri, 22 May 2009 13:05:59 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet> 
	<4A15EB3E.2000006@mrabarnett.plus.com>
	<4A15EF9E.8070406@islandtraining.com> <gv4st8$11t$1@ger.gmane.org>
	<mailman.551.1242955822.8015.python-list@python.org> 
	<003290e1$0$9725$c3e8da3@news.astraweb.com>
Message-ID: <b225774d-2db1-4171-afff-71e489494ae5@o14g2000vbo.googlegroups.com>

On May 22, 3:28?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Thu, 21 May 2009 18:30:17 -0700, Gary Herron wrote:
> >> In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
> >> point algorithm for Python so that the shortest repr that will round
> >> trip correctly is what is used as the floating point repr....
>
> >> --David
>
> > Which won't change the fact that 0.8 and lots of other favorite floats
> > are still not representable exactly, but it will hide this fact from
> > most newbies. ?One of the nicer results of this will be that these
> > (almost) weekly questions and discussions will be come a thing of the
> > past.
>
> > With a sigh of relief,
>
> Yay! We now will have lots of subtle floating point bugs that people
> can't see! Ignorance is bliss and what you don't know about floating
> point can't hurt you!

Why do you think this change will give rise to 'lots of subtle
floating point bugs'?  The new repr is still faithful, in the
sense that if x != y then repr(x) != repr(y).  Personally, I'm
not sure that the new repr is likely to do anything for
floating-point confusion either way.

What's gone in 3.1 is the capricious nature of the old "produce
17 significant digits and then remove all trailing zeros" rule
for repr.

For a specific example of the randomness of the current repr
rule, choose a random decimal in [0.5, 1.0) with at
most 12 places (say) after the decimal point;  for example, 0.567819.
Now type that number into Python at the interpreter prompt.
Then there's approximately a 9% chance (where the number 0.09 comes
from computing 2.**53/10.**17) that you'll see the number you
typed in (possibly with trailing zeros removed if you typed something
like 0.846100), and a 91% chance that you'll get the full 17
significant digits.

Try the same experiment for random decimals in the
interval [1.0, 2.0) and there's about a 45% chance you'll get
back what you typed in, and a 55% chance you'll get 17 sig. digs.

With the new repr, a float that can be specified with 15 significant
decimal digits or fewer will always use those digits for its repr.
It's not a panacea, but I don't see how it's worse than the old
repr.

Mark


From emile at fenx.com  Fri May 22 16:13:22 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 22 May 2009 13:13:22 -0700
Subject: ffmpeg and python big problem
In-Reply-To: <op.uucgqgsja8ncjz@gnudebst>
References: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>	<mailman.546.1242952690.8015.python-list@python.org>	<819491b7-67b3-446e-b77e-9553b55da9d8@e21g2000yqb.googlegroups.com>
	<op.uucgqgsja8ncjz@gnudebst>
Message-ID: <gv70th$sqk$1@ger.gmane.org>

On 5/22/2009 11:38 AM Rhodri James said...
> On Fri, 22 May 2009 13:54:26 +0100, TerabyteST <gabrycir at gmail.com> wrote:
<snip>
>> @Emile: if I can access MEncoder from python and give it the images
>> one by one, using a stream like i'm doing in ffmpeg, or telling it a
>> sequence to make a video from, I could try it.
> 

Here's the relevant code I'm using.  You can follow by mencoder's 
argument options what everything is, but essentially it expects that the 
images are collected in stillsdir, sub-titles are in srtfn, sub-title 
font in fontfn and then it creates the movie tmpfile, and if successful, 
renames it avifile.

HTH,

Emile

---------
cmdstr = '/usr/local/bin/mencoder mf://%s/*.jpg -mf 
type=jpg:w=640:h=480:fps=%d -fps %d -ofps %d -s
ub %s -font %s -vf pp=hb/vb -ovc lavc -lavcopts 
vcodec=msmpeg4v2:vbitrate=%d -oac copy -quiet -o "%s" && mv -f
  "%s" "%s"' % 
(stillsdir,FPS,FPS,FPS,srtfn,fontfn,vkbps,tmpfile,tmpfile,avifile)
print "generating movie %s from %s/" % (avifile,stillsdir)
print cmdstr
results = commands.getstatusoutput(cmdstr)
print results


> You seem to have emailed me directly, not the list.  I've copied this
> back to the list so Emile can see it too.

Thanks Rhodri -- Emile




From jcd at sdf.lonestar.org  Fri May 22 16:13:39 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 22 May 2009 16:13:39 -0400
Subject: reseting an iterator
In-Reply-To: <bb616d71-b612-4b29-9da3-f5eda5acd834@z5g2000vba.googlegroups.com>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
	<mailman.583.1242999993.8015.python-list@python.org>
	<bb616d71-b612-4b29-9da3-f5eda5acd834@z5g2000vba.googlegroups.com>
Message-ID: <1243023219.13323.2.camel@aalcdl07>

On Fri, 2009-05-22 at 10:54 -0700, Jan wrote: 
> On May 22, 9:46 am, "J. Cliff Dyer" <j... at sdf.lonestar.org> wrote:
> 
> > You don't need a reset method.  There is no hard and fast rule that
> > __iter__ must return the object itself.  It just needs to return an
> > iterator.  
> 
> I disagree.
> If ITRATOR is a true iterator, ITRATOR.__iter__() must return
> ITERATOR.
> If ITERABLE is an iterable (but not necessarily an iterator)
> ITRABLE.__iter__() must return an iterator.
> 

You are correct:  It is an iterable, not an iterator.  However, that's
not a disagreement with me.  It may not be an iterator (and I probably
should have said so) but it works, and it solves the OP's problem.
> > For example:
> >
> > >>> l = [1,2,3]
> > >>> l.__iter__()
> >
> > <listiterator object at 0x7fd0da315850>>>> l is l.__iter__()
> >
> > False
> 
> [1,2,3] is an iterable but not an iterator, so this False result is
> expected.
> Compare this with the following.
> 
> >>> ii = iter([1,2,3])  # ii is an iterator.
> >>> next(ii)
> 1
> >>> jj = ii.__iter__() # call __iter__ method on an iterator
> >>> ii is jj
> True
> >>> next(jj)
> 2
> 
> > Just create a class with an __iter__ method that returns a reset
> > iterator object.
> >
> > class X(object):
> >     def __init__(self, max=3):
> >         self.counter = 0
> >         self.max = max
> >     def __iter__(self):
> >         return self
> >     def next(self):
> >         if self.counter < self.max:
> >             self.counter += 1
> >             return self.counter
> >         else:
> >             raise StopIteration
> >
> > class Y(object):
> >     def __iter__(self):
> >         return X()
> >
> > In this setup, X has the problem you are trying to avoid, but Y behaves
> > as a resettable iterable.
> 
> > y = Y()
> 
> This does not work.
> 
> With this, y is not an interator, and not even an iterable.
> 
> > for c in y:
> 
> This produces an error because by definition of for-loops
> it is executed the same way as:
> 
> temp_iterator = iter(y) # temp_iterator is y
> while True:
>     try:
>         print(next(temp_iterator)) # temp_iterator does not support
> __next__()
>     except StopIteration:
>         break
> 

Did you try running my code?  I did.  It works on my computer.  What
error message did you get?

Cheers,
Cliff




From alan.isaac at gmail.com  Fri May 22 16:59:03 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Fri, 22 May 2009 20:59:03 GMT
Subject: define "generator" (glossary bug?)
In-Reply-To: <mailman.598.1243014276.8015.python-list@python.org>
References: <mailman.596.1243012080.8015.python-list@python.org>	<ngBRl.30$Cc1.16@nwrddc01.gnilink.net>
	<mailman.598.1243014276.8015.python-list@python.org>
Message-ID: <rmERl.94$Cc1.68@nwrddc01.gnilink.net>

On 5/22/2009 1:44 PM skip at pobox.com apparently wrote:
> Note that the glossary page is on the wiki.  Feel free to make corrections.

Well, ok, I've done so:
http://wiki.python.org/moin/PythonGlossary

But I'm just a user.  Someone should check it.

Thanks,
Alan Isaac



From Scott.Daniels at Acm.Org  Fri May 22 17:37:53 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 22 May 2009 14:37:53 -0700
Subject: package questions
In-Reply-To: <ca1c608f-1d62-468b-865c-b9ae7ce2ed37@s31g2000vbp.googlegroups.com>
References: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>
	<oqydnaGChug1QovXnZ2dnUVZ_qidnZ2d@pdx.net>
	<ca1c608f-1d62-468b-865c-b9ae7ce2ed37@s31g2000vbp.googlegroups.com>
Message-ID: <oMGdnYSGcM58hIrXnZ2dnUVZ_rCdnZ2d@pdx.net>

Daniel wrote:
> I'm on WinXP using Python 2.5  Sorry I didn't mention that at first.
Generally, you want the full version number (my 2.5 is 2.5.4).
However, I set up your demo setup, and found that 2.6.2 worked, and
2.5.4 failed in the same way you see.  I also see that even inside
the effects directory (with 2.6), I can use the syntax to work.
However, 2.5 is nearing "security fixes only" status, so I'd try
moving to 2.6. In the following, "C:\...\Py" is in my standard path.

     C:\...\Py\sound\effects> \python26\python -m sound.effects.surround
     effects package imported
     surround started
     echo imported
     echo in
     formats package imported
     formats in
     filters package imported
     equalizer imported
     filters in

But if I make a file:
     C:\...\Py\> type demo_sound.py
     import sound.effects.surround
     print('all loaded')
I can then:
     C:\...\Py> \python25\python demo_sound.py
     effects package imported
     surround started
     echo imported
     echo in
     formats package imported
     formats in
     filters package imported
     equalizer imported
     filters in
     all loaded
or even:
     C:\...\Py\sound\effects> \python25\python demo_sound.py
     effects package imported
     surround started
     echo imported
     echo in
     formats package imported
     formats in
     filters package imported
     equalizer imported
     filters in
     all loaded

So, not what you want to hear, but at least identified.  I expect
nobody wants to crawl into that code to make your case work,
especially since you can switch to 2.6 and have it work.  The
import code is said to be quite nasty and being rewritten/redocumented.


--Scott David Daniels
Scott.Daniels at Acm.Org


From news123 at free.fr  Fri May 22 17:47:32 2009
From: news123 at free.fr (News123)
Date: Fri, 22 May 2009 23:47:32 +0200
Subject: Your Favorite Python Book
In-Reply-To: <mailman.197.1242392785.8015.python-list@python.org>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<mailman.197.1242392785.8015.python-list@python.org>
Message-ID: <4a171d74$0$22768$426a74cc@news.free.fr>

Evan Kroske wrote:
> Sam Tregar wrote:
>> Greetings. I'm working on learning Python and I'm looking for good
>> books to read. I'm almost done with Dive into Python and I liked it a
>> lot. I found Programming Python a little dry the last time I looked at
>> it, but I'm more motivated now so I might return to it. What's your
>> favorite? Why?
>>
>> -sam
>>
> Programming Python is good, but its examples follow a function-based
> . . .

I would *not* recommend 'Programming Python' (but perhaps this is just,
that I expected it to be the equivalent to 'Programming Perl' in the
Python world)

It is not good for getting started as it doesn't introduce the basics
well enough.

It is not good as a reference (it never intended to be one)

It touches many topics, but doesn't really go into too much depth.

It is really weak on Object Oriented programming

I personally prefered the Python Cookbook	

As I never read "Dive into Python" I don't know what books are good
complements.


N



From daniel.watrous at gmail.com  Fri May 22 18:10:41 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Fri, 22 May 2009 15:10:41 -0700 (PDT)
Subject: package questions
References: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>
	<oqydnaGChug1QovXnZ2dnUVZ_qidnZ2d@pdx.net>
	<ca1c608f-1d62-468b-865c-b9ae7ce2ed37@s31g2000vbp.googlegroups.com>
	<oMGdnYSGcM58hIrXnZ2dnUVZ_rCdnZ2d@pdx.net>
Message-ID: <1c10617e-c20f-4d2e-9c26-203aeccb36d0@y7g2000yqa.googlegroups.com>

On May 22, 3:37?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> Daniel wrote:
> > I'm on WinXP using Python 2.5 ?Sorry I didn't mention that at first.
>
> Generally, you want the full version number (my 2.5 is 2.5.4).
> However, I set up your demo setup, and found that 2.6.2 worked, and
> 2.5.4 failed in the same way you see. ?I also see that even inside
> the effects directory (with 2.6), I can use the syntax to work.
> However, 2.5 is nearing "security fixes only" status, so I'd try
> moving to 2.6. In the following, "C:\...\Py" is in my standard path.
>
> ? ? ?C:\...\Py\sound\effects> \python26\python -m sound.effects.surround
> ? ? ?effects package imported
> ? ? ?surround started
> ? ? ?echo imported
> ? ? ?echo in
> ? ? ?formats package imported
> ? ? ?formats in
> ? ? ?filters package imported
> ? ? ?equalizer imported
> ? ? ?filters in
>
> But if I make a file:
> ? ? ?C:\...\Py\> type demo_sound.py
> ? ? ?import sound.effects.surround
> ? ? ?print('all loaded')
> I can then:
> ? ? ?C:\...\Py> \python25\python demo_sound.py
> ? ? ?effects package imported
> ? ? ?surround started
> ? ? ?echo imported
> ? ? ?echo in
> ? ? ?formats package imported
> ? ? ?formats in
> ? ? ?filters package imported
> ? ? ?equalizer imported
> ? ? ?filters in
> ? ? ?all loaded
> or even:
> ? ? ?C:\...\Py\sound\effects> \python25\python demo_sound.py
> ? ? ?effects package imported
> ? ? ?surround started
> ? ? ?echo imported
> ? ? ?echo in
> ? ? ?formats package imported
> ? ? ?formats in
> ? ? ?filters package imported
> ? ? ?equalizer imported
> ? ? ?filters in
> ? ? ?all loaded
>
> So, not what you want to hear, but at least identified. ?I expect
> nobody wants to crawl into that code to make your case work,
> especially since you can switch to 2.6 and have it work. ?The
> import code is said to be quite nasty and being rewritten/redocumented.
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

Thanks for doing the experiment.  I'll begin to consider testing with
python 2.6 for a possible upgrade.

Daniel


From sjmachin at lexicon.net  Fri May 22 19:02:15 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 23 May 2009 09:02:15 +1000
Subject: dbfpy - cannot store new record
In-Reply-To: <4A16B79B.5090601@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com>	<mailman.510.1242921221.8015.python-list@python.org>
	<71b49836-d306-4399-9543-038ca69e9abb@v23g2000pro.googlegroups.com>
	<4A164769.5050802@shopzeus.com>
	<89b96c19c29ffa4439c1f4cb9a26efda@preisshare.net>
	<4A16B79B.5090601@shopzeus.com>
Message-ID: <4A172EF7.5010300@lexicon.net>

On 23/05/2009 12:32 AM, Laszlo Nagy wrote:
> 
>> dbfpy is very old code.....
>>
>> Try setting up a CHAR(1) field and filling it with "Y" or "N" or
>> "T" or "F".. indicating yes,no,true or false...
>>   
> Unfortunately, my task is to import records into a database that is used 
> by an old foxpro program. I'm not allowed to change the database 
> structure in any way.

It would have helped if you'd mentioned "foxpro" in your first message 
... [Q1] Is that really merely "Foxpro" or is it actually "Visual 
Foxpro" aka "VFP"? What version?

And some more questions:
[Q2] What (in hex, please) is in the first byte of the existing "old 
foxpro" DBF files that you need to update?
[Q3] Do you see the string "_NullFlags" in the first 1000 or so bytes of 
  those DBF files?
[Q4] What makes you sure that the "old foxpro program" can handle NULLs 
in L (logical) fields?
[Q5] How are NULLs represented in L (logical) fields in those files:
    (a) "?"
    (b) " "
    (c) weird stuff (see Q3)
    (d) something else
[Q6] Are there any FPT files in the same folder as the DBF files?
[Q7] Are there any CDX or MDX (or other ??X) files in the same folder as 
the DBF files?

>> otherwise... just debug the dbfpy code...
>>   
> This is what I'll do. Thanks.

Debugging something usually implies that the debugger knows what is 
expected behaviour :-)

In any case, what's to debug? The dbf code says rather plainly that it's 
set up for an (a) answer to Q5:
''' from fields.py line 311 onwards:
     def encodeValue(self, value):
         """Return a character from the "TF?" set.

         Return:
             Return value is "T" if ``value`` is True
             "?" if value is -1 or False otherwise.

         """
         if value is True:
             return "T"
         if value == -1:
             return "?"
         return "F"
'''

Cheers,
John


From sajmikins at gmail.com  Fri May 22 19:33:41 2009
From: sajmikins at gmail.com (Simon Forman)
Date: Fri, 22 May 2009 16:33:41 -0700 (PDT)
Subject: pushback iterator
References: <mailman.286.1242571201.8015.python-list@python.org>
Message-ID: <113b1286-a146-4ae5-8a17-2a24fe30212f@c9g2000yqm.googlegroups.com>

On May 17, 10:39?am, Matus <mat... at gmail.com> wrote:
> Hallo pylist,
>
> I searches web and python documentation for implementation of pushback
> iterator but found none in stdlib.
>
> problem:
> ========
> when you parse a file, often you have to read a line from parsed file
> before you can decide if you want that line it or not. if not, it would
> be a nice feature to be able po push the line back into the iterator, so
> nest time when you pull from iterator you get this 'unused' line.
>
> solution:
> =========
> I found a nice and fast solution somewhere on the net:
>
> ---------------------------------------------------------------------
> class Pushback_wrapper( object ):
> ? ? ? ? def __init__( self, it ):
> ? ? ? ? ? ? ? ? self.it = it
> ? ? ? ? ? ? ? ? self.pushed_back = [ ]
> ? ? ? ? ? ? ? ? self.nextfn = it.next
>
> ? ? ? ? def __iter__( self ):
> ? ? ? ? ? ? ? ? return self
>
> ? ? ? ? def __nonzero__( self ):
> ? ? ? ? ? ? ? ? if self.pushed_back:
> ? ? ? ? ? ? ? ? ? ? ? ? return True
>
> ? ? ? ? ? ? ? ? try:
> ? ? ? ? ? ? ? ? ? ? ? ? self.pushback( self.nextfn( ) )
> ? ? ? ? ? ? ? ? except StopIteration:
> ? ? ? ? ? ? ? ? ? ? ? ? return False
> ? ? ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? ? ? return True
>
> ? ? ? ? def popfn( self ):
> ? ? ? ? ? ? ? ? lst = self.pushed_back
> ? ? ? ? ? ? ? ? res = lst.pop( )
> ? ? ? ? ? ? ? ? if not lst:
> ? ? ? ? ? ? ? ? ? ? ? ? self.nextfn = self.it.next
> ? ? ? ? ? ? ? ? return res
>
> ? ? ? ? def next( self ):
> ? ? ? ? ? ? ? ? return self.nextfn( )
>
> ? ? ? ? def pushback( self, item ):
> ? ? ? ? ? ? ? ? self.pushed_back.append( item )
> ? ? ? ? ? ? ? ? self.nextfn = self.popfn
> ---------------------------------------------------------------------
>
> proposal:
> =========
> as this is (as I suppose) common problem, would it be possible to extend
> the stdlib of python (ie itertools module) with a similar solution so
> one do not have to reinvent the wheel every time pushback is needed?
>
> thx, Matus


By coincidence I had need of just such a pushback iterator just the
other day. I was playing with queues and generators after reading
David Beazley's "Generator Tricks For Systems Programmers" [1] and I
needed an iterator that could be used with this generator function:

def pushQueueNonblocking(queue, iterator):
    for item in iterator:
        try:
            queue.put(item, False)
        except Queue.Full:
            raise Queue.Full(item)

If the queue is full I pass item taken from the iterator but not yet
pushed onto the queue up to the caller in the Full exception so it
doesn't get lost. I wrote a wrapper function that retried putting
items on the queue after sleeping for a certain time if the queue is
full.

def pushQueueRetry(queue, iterator, retry_delay=1):
    iterator = IteratorWithPushback(iterator)
    while True:
        try:
            pushQueueNonblocking(queue, iterator)
        except Queue.Full, err:
            iterator.pushback(err.args[0])
            if retry_delay >= 0:
                sleep(retry_delay)
        else:
            break

Originally I used an itertools.chain() solution, but when I tried the
function with sleep of 0 (the queue was being get() from once a second
in another thread) I hit a funny error.

Because the put() thread was running, and retrying, much faster than
the get() thread, a huge "linked list" of itertools.chain generator
objects was stored up in memory.  When the get() thread finally
unblocked the queue and the call to put() succeeded, the
pushQueueNonblocking() would loop and call next() on the chain object,
which would call next() on the next chain object, which called next()
on the next next chain object, etc...

That linked list of chain iterators was longer than
sys.getrecursionlimit().

Anyway, FWIW here's the IteratorWithPushback class that I whanged up:


class IteratorWithPushback:

    def __init__(self, initial_iterator):
        self.iter = iter(initial_iterator)
        self.last = None
        self.has_last = False

    def __iter__(self):
        return self

    def next(self):
        if self.has_last:
            item = self.last
            self.has_last = False
            self.last = None # Don't hang on to it.
        else:
            item = self.iter.next()
        return item

    def pushback(self, item):
        if self.has_last:
            raise Exception("I'm full!")
        self.last = item
        self.has_last = True

As for putting something like this in the standard library, I'm not
sure. I've never needed one before and it's easy enough to write.
*shrug*


Regards,
~Simon

[1] http://www.dabeaz.com/generators/Generators.pdf


From Scott.Daniels at Acm.Org  Fri May 22 19:46:19 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 22 May 2009 16:46:19 -0700
Subject: package questions
In-Reply-To: <1c10617e-c20f-4d2e-9c26-203aeccb36d0@y7g2000yqa.googlegroups.com>
References: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>
	<oqydnaGChug1QovXnZ2dnUVZ_qidnZ2d@pdx.net>
	<ca1c608f-1d62-468b-865c-b9ae7ce2ed37@s31g2000vbp.googlegroups.com>
	<oMGdnYSGcM58hIrXnZ2dnUVZ_rCdnZ2d@pdx.net>
	<1c10617e-c20f-4d2e-9c26-203aeccb36d0@y7g2000yqa.googlegroups.com>
Message-ID: <a6OdnVLnwK9kqorXnZ2dnUVZ_hWdnZ2d@pdx.net>

Daniel wrote:
> Thanks for doing the experiment.  I'll begin to consider testing with
> python 2.6 for a possible upgrade.

I hope you know you can have different minor versions installed
simultaneously.

--Scott David Daniels
Scott.Daniels at Acm.Org



From redforks at gmail.com  Fri May 22 20:30:50 2009
From: redforks at gmail.com (Red Forks)
Date: Sat, 23 May 2009 08:30:50 +0800
Subject: defaultdict's bug or feature?
In-Reply-To: <op.uuce3epla8ncjz@gnudebst>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
	<op.uua0bujla8ncjz@gnudebst>
	<3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
	<op.uubdppr7a8ncjz@gnudebst>
	<3f18b3f10905220153u57016ddby3e31ada91630da0d@mail.gmail.com>
	<op.uuce3epla8ncjz@gnudebst>
Message-ID: <3f18b3f10905221730s155ba0c8i4fb6ecd935ecb9a5@mail.gmail.com>

On Sat, May 23, 2009 at 2:03 AM, Rhodri James
<rhodri at wildebst.demon.co.uk>wrote:

> I asked you not to top-post.  Please put your replies *below* the
> messages you're quoting, not above.  It's much easier to understand
> the conversation that we're having if you do that, and much more
> aggravating if you don't.
>
I misunderstand you last email, thanks.

>
> On Fri, 22 May 2009 09:53:04 +0100, Red Forks <redforks at gmail.com> wrote:
>
>  Yes, you maybe right. When use defaultdict, should not rely get() method
>> anymore, d[] is just enough.
>>
>
> Almost.  You should rely on get() to do what it says, not what you think
> it should do.  That's generally true, by the way; when the Fine Manual
> says that a class, function or method will do one thing, expecting it to
> do something else is unreasonable.
>
>  Actually, I steal defaultdict to do other things:
>>
>> class OnloadDict(defaultdict):
>>    def __init__(self, onload):
>>        self.__onload = onload
>>
>>    def __missing__(self, key):
>>        result = self.__onload(key)
>>        if not result:
>>            raise KeyError
>>
>>        self[key] = result
>>        return result
>>
>>    def get(self, key, default = None):
>>        ''' defaultdict.get() won't call __missing__, so override '''
>>        try:
>>            return self[key]
>>        except KeyError:
>>            return default
>>
>> OnloadDict, is like a cache. When the value is not in dict, using 'onload'
>> function to load the value by the key.
>> When no value correspond to a key, a KeyError will raised. So I need a
>> *safer* version 'get()' method.
>>
>
> Why are you so determined to (ab)use get() on your class?  You should
> only be calling OnloadDict.get() if you really mean "get me the value
> associated with this key, or the default I'm telling you about *right*
> *now* if there isn't one."

The key point is: "what key/value pairs should in defaultdict". I think any
key/default pair(they'll add to dict when you ask for it), maybe you think
only manual added pairs.
defaultdict break dict rules, that a query method (d[key]) should not modify
dict, so another query method (the get() method) break default rule is not a
big deal.
Never mind, my "get()" method hack works OK.

>
>
> Aside from that, this is neat.  Strictly you should call
> defaultdict.__init__(self) in your __init__() function just in case
> defaultdict needs any setup that you aren't doing (which it does, but
> you override __missing__() so it never notices that it doesn't have
> a default_factory).  You get away with it here, but it's not a good
> habit to get into.
>
I'm new to python, adding  'defaultdict.__init__()' call would be nice. In
other languages, base class's default constructor is automaticlly called.

>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From jcd at sdf.lonestar.org  Fri May 22 20:31:22 2009
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Sat, 23 May 2009 00:31:22 +0000
Subject: reseting an iterator
In-Reply-To: <bb616d71-b612-4b29-9da3-f5eda5acd834@z5g2000vba.googlegroups.com>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
	<mailman.583.1242999993.8015.python-list@python.org>
	<bb616d71-b612-4b29-9da3-f5eda5acd834@z5g2000vba.googlegroups.com>
Message-ID: <1243038682.1793.2.camel@mctell>

On Fri, 2009-05-22 at 10:54 -0700, Jan wrote:
> This produces an error because by definition of for-loops
> it is executed the same way as:
> 
> temp_iterator = iter(y) # temp_iterator is y
> while True:
>     try:
>         print(next(temp_iterator)) # temp_iterator does not support
> __next__()
>     except StopIteration:
>         break
> 

I think this is where you missed my point.

iter(y) actually returns an instance of class X, which does support
iteration.  And it returns a new X each time, thus resetting the
iterator.

That exact setup might or might not support your use case.  I don't
know, because you haven't described it.  However, whatever you need done
to X to get it back in shape to reiterate over can be done in
Y.__iter__().

Honestly, do you care if it's an iterator or an iterable, so long as
python can handle the job?






From mypromise at sina.com  Fri May 22 20:58:14 2009
From: mypromise at sina.com (zhouhaifeng)
Date: Sat, 23 May 2009 08:58:14 +0800
Subject: SendMessage question
Message-ID: <4A174A26.20209@sina.com>

Hi,I want to send "ctrl + A" and "ctrl + C" to a window,
but my code can not work, who can help me ?

Thanks a lot!

hWnd = win32gui.FindWindow(None, "?pad")
print hWnd
if hWnd <> 0:
point = (555, 175)
x, y = point
win32api.SetCursorPos(point)

win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)

#ctrl + A
win32api.SendMessage(hWnd, 0, win32con.VK_CONTROL, 0)
win32api.Sleep(10)
win32api.SendMessage(hWnd, 0, 65, 0)
win32api.SendMessage(hWnd, win32con.KEYEVENTF_KEYUP, 65, 0)
win32api.SendMessage(hWnd, win32con.KEYEVENTF_KEYUP, win32con.VK_CONTROL, 0)
win32api.Sleep(10)

#ctrl + C
win32api.SendMessage(hWnd, win32con.WM_KEYDOWN, win32con.VK_CONTROL, 0)
win32api.Sleep(10)
win32api.SendMessage(hWnd, win32con.WM_KEYDOWN, 67, 0)
win32api.SendMessage(hWnd, win32con.WM_KEYUP, 67, 0)
win32api.SendMessage(hWnd, win32con.WM_KEYUP, win32con.VK_CONTROL, 0)
win32api.Sleep(10)


From dan.shumaker at comcast.net  Fri May 22 21:53:34 2009
From: dan.shumaker at comcast.net (danshumaker)
Date: Fri, 22 May 2009 18:53:34 -0700 (PDT)
Subject: Background subprocess help?
Message-ID: <23680206.post@talk.nabble.com>


Hi,
I'm trying to do something as simple as this:

"sleep 10; mail -s "test" dans < communicate_with_process &"

which executes immediately because it is backgrounded with "&".

or more generically in english:

"do some long process in the background;  send me mail when it's done; allow
me to quit the tool that started launched the long process."

I've found several examples that are close but none of the permeatations I
try work.  The closest examples I've found start sending signals to
processes and/or callbacks and 50+ lines of python code.

I found the cliUtils module which came close.. but no cigar.

I find it hard to believe that a one liner in bash/tcsh has to end up being
many lines in python.  That makes me think I'm missing something.

Surely thousands of people have done this before -- start a background
process and want notification when it's done.

Anybody have any suggestions on modules to  try or quick subprocess commands
that work?  This came close
http://docs.python.org/library/subprocess.html#replacing-shell-pipeline but
no cigar too.

Thank you so much for any help or suggestions.

   -d
-- 
View this message in context: http://www.nabble.com/Background-subprocess-help--tp23680206p23680206.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From ldo at geek-central.gen.new_zealand  Fri May 22 22:18:21 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 23 May 2009 14:18:21 +1200
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz>
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
	<pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>
	<8dc983db-b8c4-4897-a58b-969ca5f8e14f@g20g2000vba.googlegroups.com>
Message-ID: <gv7mdd$45j$2@lust.ihug.co.nz>

In message <8dc983db-b8c4-4897-
a58b-969ca5f8e14f at g20g2000vba.googlegroups.com>, Beni Cherniavsky wrote:

> And yes, it's icky - not because of the ``else`` but because
> aquisition-release done correctly is always an icky pattern.

Only in the presence of exceptions.



From ldo at geek-central.gen.new_zealand  Fri May 22 22:26:55 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 23 May 2009 14:26:55 +1200
Subject: UDP reading on multiple sockets
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net>
	<15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>
	<27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
Message-ID: <gv7mtg$4nk$1@lust.ihug.co.nz>

In message <27bd949f-80b5-44c9-8e3b-
c12b49c7ed82 at r34g2000vbi.googlegroups.com>, thomas.vogel at likeabird.de wrote:

> The only honest answer would be that I'm totaly unfamiliar with select
> and also the documentation I found wasn't able to clear the picture.
> So are there examples of using select together with sockets available?

select is easy to use. In Python, you just pass it three lists of file-like 
objects (anything that implements fileno in the way described in the docs), 
together with an optional timeout. It will return three corresponding lists, 
being subsets of the ones you passed (which might all be empty if the 
timeout expired). You then just go through each item in each returned list, 
doing reads (or accepts, as appropriate) from the files that have something 
waiting to be read, writing to the ones waiting for something to be written, 
and perhaps reporting errors and closing the ones that report problems. 
That's basically all there is to it.

This example, of how do implement a timeout on I/O 
<http://codecodex.com/wiki/index.php?title=I/O_With_Timeout>, is in C, but 
it should help you get the idea.



From steve at REMOVE-THIS-cybersource.com.au  Fri May 22 22:53:35 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 23 May 2009 02:53:35 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
	<4A15EB3E.2000006@mrabarnett.plus.com>
	<4A15EF9E.8070406@islandtraining.com> <gv4st8$11t$1@ger.gmane.org>
	<mailman.551.1242955822.8015.python-list@python.org>
	<003290e1$0$9725$c3e8da3@news.astraweb.com>
	<b225774d-2db1-4171-afff-71e489494ae5@o14g2000vbo.googlegroups.com>
Message-ID: <00333f9c$0$9725$c3e8da3@news.astraweb.com>

On Fri, 22 May 2009 13:05:59 -0700, Mark Dickinson wrote:

>> > With a sigh of relief,
>>
>> Yay! We now will have lots of subtle floating point bugs that people
>> can't see! Ignorance is bliss and what you don't know about floating
>> point can't hurt you!
> 
> Why do you think this change will give rise to 'lots of subtle floating
> point bugs'?  The new repr is still faithful, in the sense that if x !=
> y then repr(x) != repr(y).  Personally, I'm not sure that the new repr
> is likely to do anything for floating-point confusion either way.

I'm sorry, did I forget a wink? Apparently I did :)

I don't think this change will *cause* bugs. However, it *may* (and I 
emphasis the may, because it hasn't been around long enough to see the 
effect) allow newbies to remain in blissful ignorance of floating point 
issues longer than they should.

Today, the first time you call repr(0.8) you should notice that the float 
you have is *not quite* the number you thought you had, which alerts you 
to the fact that floats aren't the real numbers you learned about it 
school. From Python 3.1, that reality will be hidden just a little bit 
longer.


[...]
> With the new repr, a float that can be specified with 15 significant
> decimal digits or fewer will always use those digits for its repr. It's
> not a panacea, but I don't see how it's worse than the old repr.

It's only worse in the sense that ignorance isn't really bliss, and this 
change will allow programmers to remain ignorant a little longer. I 
expect that instead of obviously wet-behind-the-ears newbies asking "I'm 
trying to creating a float 0.1, but can't, does Python have a bug?" we'll 
start seeing not-such-newbies asking "I've written a function that 
sometimes misbehaves, and after heroic effort to debug it, I discovered 
that Python has a bug in simple arithmetic, 0.2 + 0.1 != 0.3".

I don't think this will be *worse* than the current behaviour, only bad 
in a different way.


-- 
Steven


From yashgt at gmail.com  Fri May 22 23:07:46 2009
From: yashgt at gmail.com (Yash Ganthe)
Date: Fri, 22 May 2009 20:07:46 -0700 (PDT)
Subject: Looking for module for shrinking a list with n-point means
References: <64997d17-9811-4fb1-a729-c80dd9fbcd9a@g22g2000pra.googlegroups.com>
	<eP6dnSX_2dDcMYvXnZ2dnUVZ_v2dnZ2d@pdx.net>
	<mailman.603.1243019223.8015.python-list@python.org>
Message-ID: <b56c61df-ee42-4eed-af51-7f8f69f54a3c@b6g2000pre.googlegroups.com>

Thanks John,

The code u provided works for me. Indeed it is a simple requirement
and I am a complete novice to Python.

-Yash


From gagsl-py2 at yahoo.com.ar  Fri May 22 23:14:09 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 23 May 2009 00:14:09 -0300
Subject: Ambiguous locale.strxfrm
References: <4a167138$0$6271$9b536df3@news.fv.fi>
Message-ID: <op.uuc4lvhux6zn5v@lepton.softlabbsas.com.ar>

En Fri, 22 May 2009 06:32:40 -0300, Tuomas Vesterinen  
<tuomas.vesterinen at iki.fi> escribi?:

> This was fixed once in Python 2.5, but in Python 3.0 the bug celebrates  
> its comeback. The tail of the strxfrm result is ambiguous.
>
> Python 3.0.1 (r301:69556, Apr 14 2009, 14:30:31)
> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>  >>> import locale
>  >>> locale.setlocale(locale.LC_COLLATE, 'en_US.utf8')
> 'en_US.utf8'
>  >>> key1=locale.strxfrm('maupassant guy')
>  >>>> for i in range(10):
> ...     print(locale.strxfrm('maupassant guy')==key1)
> ...
> False
> True
> False
> False
> False
> False
> False
> False
> False
> False

I could not reproduce the issue on Windows (I don't have any locale using  
utf8) but you should file a bug report at http://bugs.python.org/


-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May 22 23:56:43 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 23 May 2009 00:56:43 -0300
Subject: Disabling Logging Handler for a Second
References: <839278.93751.qm@web8408.mail.in.yahoo.com>
Message-ID: <op.uuc6ktxkx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 22 May 2009 08:26:49 -0300, VenkataRamaKrishna Boddu  
<bvrkchowdary at yahoo.co.in> escribi?:

> Is there any way, I can disable one logging Handler, while other Log  
> Handler are still available for servicing.....

> import logging;
> import sys;
>
> thelog = logging.getLogger('app.scsi.cdb');
> strmHdlr = logging.StreamHandler(sys.stdout);
> fHdlr = logging.FileHandler('a.log')

Please don't use ; to end statements. In Python, ; is a statement  
*separator*, only required when putting two or more statements in a single  
line. This is very rarely done; I bet most Python users don't even know  
about ;

> ## Now, I want to disable the strmHdlr for some moment without
> ## actually removing the Handler from logger Object,
> ## I want to say something like
> ##
> ## thelog.disable('StreamHandler');
> ##
> ## So., that it disables all the Stream Handlers attached to the Logger  
> Object
>
> ## The Need for me is that, I should write My Email Id only to File  
> Stream
> ## and because of some reasons of moduler design, I don't have  
> references to the
> ## both the Handlers
>
> ## Here, I don't have want to do the StreamHandler removing stuff and  
> adding it again later on
> thelog.removeHandler(strmHdlr);
> thelog.info('Email: bvrkchowdary at yahoo.co.in');

Instead of disable/enable handlers (or remove/reinsert them), use any of  
these:

- Levels: loggers have a minimum level to process, and handlers too. If  
you set the StreamHandler to a slightly higher level than the others, it  
won't process certain messages. You may use the existing level names, or  
create a new one (logging.addLevelName), let's say DETINFO = INFO-5  
(DETailed INFO). Set the logger and the file handler level both to  
DETINFO, and the stream handler to INFO. Then use DETINFO to log the email.

- Filters: You can install a filter onto the stream handler (using  
handler.addFilter) that rejects any record whose msg starts with 'Email:'  
(or whatever you consider apropiate)

-- 
Gabriel Genellina



From mk.fraggod at gmail.com  Sat May 23 00:15:24 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sat, 23 May 2009 10:15:24 +0600
Subject: While Statement
In-Reply-To: <0032680f$0$9718$c3e8da3@news.astraweb.com>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
	<mailman.571.1242984862.8015.python-list@python.org>
	<00325a9c$0$9685$c3e8da3@news.astraweb.com>
	<mailman.575.1242991149.8015.python-list@python.org>
	<0032680f$0$9718$c3e8da3@news.astraweb.com>
Message-ID: <20090523101524.33b07ef0@coercion>

On Fri, 22 May 2009 21:33:05 +1000
Joel Ross <joelc at cognyx.com> wrote:

> changed it to "float(number)/total*100" and it worked thanks for all 
> your help appreciated

I believe operator.truediv function also deserves a mention here, since
line "op.truediv(number, total) * 100" somehow seem to make more sense
to me than an explicit conversion.
There's also "op.itruediv" for "number /= float(total) * 100" case.

http://docs.python.org/dev/library/operator.html

-- 
Mike Kazantsev // fraggod.net
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From gagsl-py2 at yahoo.com.ar  Sat May 23 00:41:54 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 23 May 2009 01:41:54 -0300
Subject: Disabling Logging Handler for a Second
References: <839278.93751.qm@web8408.mail.in.yahoo.com>
	<op.uuc6ktxkx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <op.uuc8n4hdx6zn5v@lepton.softlabbsas.com.ar>

En Sat, 23 May 2009 00:56:43 -0300, Gabriel Genellina  
<gagsl-py2 at yahoo.com.ar> escribi?:

> - Filters: You can install a filter onto the stream handler (using  
> handler.addFilter) that rejects any record whose msg starts with  
> 'Email:' (or whatever you consider apropiate)

s/apropiate/appropriate/

-- 
Gabriel Genellina



From joelc at cognyx.com  Sat May 23 01:33:00 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sat, 23 May 2009 15:33:00 +1000
Subject: Problems with sys.stout.flush()
Message-ID: <0033652b$0$9724$c3e8da3@news.astraweb.com>

Hi all,

I'm using python 2.5 and trying to flush the sys.stout buffer with 
sys.stout.flush(), but doesn't seem to work. Each time a line is printed 
   it appends the one before it I need to clear the output and write a 
new output without appending the previous one. I have tried the -u 
(unbuffered) option for python and a few examples from this site 
http://stackoverflow.com/questions/107705/python-output-buffering

Code:

import sys
from time import sleep

def progress(number, total,  char):

     percentage = float(number*100)/total
     percentage = int(round(percentage))
     percentage = int(100 - percentage)
     if percentage > 0:
         char = char * percentage
         sys.stdout.write(char)
         sys.stdout.flush()      #Not working correctly
         sleep(2)

progress(40, 50, "*")
progress(30, 50, "*")
progress(20, 50, "*")
progress(10, 50, "*")
progress(2, 50, "*")

Regards

jross


From pavlovevidence at gmail.com  Sat May 23 02:47:44 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 22 May 2009 23:47:44 -0700 (PDT)
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
Message-ID: <a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>

On May 22, 10:33?pm, Joel Ross <jo... at cognyx.com> wrote:
> Hi all,
>
> I'm using python 2.5 and trying to flush the sys.stout buffer with
> sys.stout.flush(), but doesn't seem to work. Each time a line is printed
> ? ?it appends the one before it I need to clear the output and write a
> new output without appending the previous one.

That's not how streams work, chief.  Once you output (and flush)
something you can't un-output it.

What you probably want to do is to write a carriage return ("\r")
which usually causes the cursor to return to the beginning of the
line, so that any new text you write overwrites the old text.

This has nothing to do with flushing; flushing doesn't erase or clear
the old input.  Flushing is usually needed for a different reason,
however, namely standard output doesn't actually get sent to the
console until it sees a newline ("\n") unless you flush the buffer.

Try to adapt this example to your problem:

for i in xrange(11):
    sys.stdout.write('*'*(10-i) + ' '*i + '\r')
    sys.stdout.flush()
    time.sleep(2)


Notice that you have to print out spaces as well, to overwrite the
previous characters on the line (well, it might not be strictly needed
for a progress bar that only grows, but it's normally a good idea.


> I have tried the -u
> (unbuffered) option for python and a few examples from this sitehttp://stackoverflow.com/questions/107705/python-output-buffering
>
> Code:
>
> import sys
> from time import sleep
>
> def progress(number, total, ?char):
>
> ? ? ?percentage = float(number*100)/total
> ? ? ?percentage = int(round(percentage))
> ? ? ?percentage = int(100 - percentage)
> ? ? ?if percentage > 0:
> ? ? ? ? ?char = char * percentage
> ? ? ? ? ?sys.stdout.write(char)
> ? ? ? ? ?sys.stdout.flush() ? ? ?#Not working correctly
> ? ? ? ? ?sleep(2)
>
> progress(40, 50, "*")
> progress(30, 50, "*")
> progress(20, 50, "*")
> progress(10, 50, "*")
> progress(2, 50, "*")
>
> Regards
>
> jross



Carl Banks


From lepto.python at gmail.com  Sat May 23 03:48:38 2009
From: lepto.python at gmail.com (oyster)
Date: Sat, 23 May 2009 15:48:38 +0800
Subject: html ui + py background? any tut?
Message-ID: <6a4f17690905230048p6c28cedek73dc49a9ea0fd9fb@mail.gmail.com>

I have read for many times that the modern appliaction (not a web one,
but desktop on) uses html + js for its UI, and python code is for the
background work
but I have never found event a simple (yet completed) article on how
to develop such a thing from scrach in these advocacy thing.

Can anyone point out some simple, can-be-followed tutorial on such
thing especially for windows os?

thanx


From tuomas.vesterinen at iki.fi  Sat May 23 05:09:59 2009
From: tuomas.vesterinen at iki.fi (Tuomas Vesterinen)
Date: Sat, 23 May 2009 12:09:59 +0300
Subject: Ambiguous locale.strxfrm
In-Reply-To: <mailman.610.1243048432.8015.python-list@python.org>
References: <4a167138$0$6271$9b536df3@news.fv.fi>
	<mailman.610.1243048432.8015.python-list@python.org>
Message-ID: <4a17bd67$0$24790$9b536df3@news.fv.fi>


Thanks. Bug report done, issue 6093.

Tuomas Vesterinen

Gabriel Genellina wrote:
> En Fri, 22 May 2009 06:32:40 -0300, Tuomas Vesterinen 
> <tuomas.vesterinen at iki.fi> escribi?:
> 
>> This was fixed once in Python 2.5, but in Python 3.0 the bug 
>> celebrates its comeback. The tail of the strxfrm result is ambiguous.
>>
>> Python 3.0.1 (r301:69556, Apr 14 2009, 14:30:31)
>> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>>  >>> import locale
>>  >>> locale.setlocale(locale.LC_COLLATE, 'en_US.utf8')
>> 'en_US.utf8'
>>  >>> key1=locale.strxfrm('maupassant guy')
>>  >>>> for i in range(10):
>> ...     print(locale.strxfrm('maupassant guy')==key1)
>> ...
>> False
>> True
>> False
>> False
>> False
>> False
>> False
>> False
>> False
>> False
> 
> I could not reproduce the issue on Windows (I don't have any locale 
> using utf8) but you should file a bug report at http://bugs.python.org/
> 
> 


From joelc at cognyx.com  Sat May 23 05:20:47 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sat, 23 May 2009 19:20:47 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
Message-ID: <0227b2f0$0$25303$c3e8da3@news.astraweb.com>

Carl Banks wrote:
> On May 22, 10:33 pm, Joel Ross <jo... at cognyx.com> wrote:
>> Hi all,
>>
>> I'm using python 2.5 and trying to flush the sys.stout buffer with
>> sys.stout.flush(), but doesn't seem to work. Each time a line is printed
>>    it appends the one before it I need to clear the output and write a
>> new output without appending the previous one.
> 
> That's not how streams work, chief.  Once you output (and flush)
> something you can't un-output it.
> 
> What you probably want to do is to write a carriage return ("\r")
> which usually causes the cursor to return to the beginning of the
> line, so that any new text you write overwrites the old text.
> 
> This has nothing to do with flushing; flushing doesn't erase or clear
> the old input.  Flushing is usually needed for a different reason,
> however, namely standard output doesn't actually get sent to the
> console until it sees a newline ("\n") unless you flush the buffer.
> 
> Try to adapt this example to your problem:
> 
> for i in xrange(11):
>     sys.stdout.write('*'*(10-i) + ' '*i + '\r')
>     sys.stdout.flush()
>     time.sleep(2)
> 
Your example prints a new line each time, Doesn't help me with a 
progress bar, do you know of anyway doing it with the print command? My 
progress bars works fine this is the only problem im having with it at 
the moment. any help would be appreciated.

cheers
> 
> Notice that you have to print out spaces as well, to overwrite the
> previous characters on the line (well, it might not be strictly needed
> for a progress bar that only grows, but it's normally a good idea.
> 
> 
>> I have tried the -u
>> (unbuffered) option for python and a few examples from this sitehttp://stackoverflow.com/questions/107705/python-output-buffering
>>
>> Code:
>>
>> import sys
>> from time import sleep
>>
>> def progress(number, total,  char):
>>
>>      percentage = float(number*100)/total
>>      percentage = int(round(percentage))
>>      percentage = int(100 - percentage)
>>      if percentage > 0:
>>          char = char * percentage
>>          sys.stdout.write(char)
>>          sys.stdout.flush()      #Not working correctly
>>          sleep(2)
>>
>> progress(40, 50, "*")
>> progress(30, 50, "*")
>> progress(20, 50, "*")
>> progress(10, 50, "*")
>> progress(2, 50, "*")
>>
>> Regards
>>
>> jross
> 
> 
> 
> Carl Banks


From david.lyon at preisshare.net  Sat May 23 05:24:14 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Sat, 23 May 2009 05:24:14 -0400
Subject: html ui + py =?UTF-8?Q?background=3F=20any=20tut=3F?=
In-Reply-To: <6a4f17690905230048p6c28cedek73dc49a9ea0fd9fb@mail.gmail.com>
References: <6a4f17690905230048p6c28cedek73dc49a9ea0fd9fb@mail.gmail.com>
Message-ID: <c3c9aea49d75ab1914ebaa826f03d57a@preisshare.net>


Hi,

I don't know any tutorial either...

At work, we have made gui apps using wxpython to make the gui...

wxpython has html viewer component...

you can use Cheetah or another template engine to make the
html...

It's pretty easy and effective...

David


On Sat, 23 May 2009 15:48:38 +0800, oyster <lepto.python at gmail.com> wrote:
> I have read for many times that the modern appliaction (not a web one,
> but desktop on) uses html + js for its UI, and python code is for the
> background work
> but I have never found event a simple (yet completed) article on how
> to develop such a thing from scrach in these advocacy thing.
> 
> Can anyone point out some simple, can-be-followed tutorial on such
> thing especially for windows os?
> 
> thanx


From pavlovevidence at gmail.com  Sat May 23 05:38:29 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 23 May 2009 02:38:29 -0700 (PDT)
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
Message-ID: <fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>

On May 23, 2:20?am, Joel Ross <jo... at cognyx.com> wrote:
> Carl Banks wrote:
> > On May 22, 10:33 pm, Joel Ross <jo... at cognyx.com> wrote:
> >> Hi all,
>
> >> I'm using python 2.5 and trying to flush the sys.stout buffer with
> >> sys.stout.flush(), but doesn't seem to work. Each time a line is printed
> >> ? ?it appends the one before it I need to clear the output and write a
> >> new output without appending the previous one.
>
> > That's not how streams work, chief. ?Once you output (and flush)
> > something you can't un-output it.
>
> > What you probably want to do is to write a carriage return ("\r")
> > which usually causes the cursor to return to the beginning of the
> > line, so that any new text you write overwrites the old text.
>
> > This has nothing to do with flushing; flushing doesn't erase or clear
> > the old input. ?Flushing is usually needed for a different reason,
> > however, namely standard output doesn't actually get sent to the
> > console until it sees a newline ("\n") unless you flush the buffer.
>
> > Try to adapt this example to your problem:
>
> > for i in xrange(11):
> > ? ? sys.stdout.write('*'*(10-i) + ' '*i + '\r')
> > ? ? sys.stdout.flush()
> > ? ? time.sleep(2)
>
> Your example prints a new line each time,

Did you run it and observe what happened, or did you just guess what
it actually did?  On my system it doesn't print new lines.


> Doesn't help me with a
> progress bar, do you know of anyway doing it with the print command? My
> progress bars works fine this is the only problem im having with it at
> the moment. any help would be appreciated.

Well, based on the code you posted it doesn't look like your progress
bar is fine.

Anyway, you haven't described the problem you are having very well,
and we can guess what might be wrong but if you want better help
you're going to have to describe your problem more coherently.  Give
us the

1. What code are you actually running (cut-and-paste, please, don't
retype).
2. What do you expect the code to output (type in actual output you
expect to see, not merely a description).
3. What does the code actually output when you run it (cut-and paste,
please, don't just describe).
4. Include any tracebacks if there are any.

In the meantime, I repeat my suggestion that you take my example and
adapt it to what you are doing.

One other note: the print statement is unsuitable for this task
because it always prints a trailing whitespace.  Use sys.stdout.write
for it.


Carl Banks


From medmediani at gmail.com  Sat May 23 06:13:32 2009
From: medmediani at gmail.com (Mohammed Mediani)
Date: Sat, 23 May 2009 12:13:32 +0200
Subject: Problems with sys.stout.flush()
In-Reply-To: <0033652b$0$9724$c3e8da3@news.astraweb.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
Message-ID: <1aa8f3840905230313o70d85d2w7fca3cd974f21606@mail.gmail.com>

Hi all,
Is anyone aware of a 3-d plotting tool for simple mathematical functions. It
seems that all the tools available have their problems with new versions.
None of matplotlib, nor PyX, nor mat3d,.... seems to work for 3d anymore.
Any suggestions???
Thanks
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From joelc at cognyx.com  Sat May 23 06:49:13 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sat, 23 May 2009 20:49:13 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
Message-ID: <0033af48$0$9681$c3e8da3@news.astraweb.com>

Carl Banks wrote:
> On May 23, 2:20 am, Joel Ross <jo... at cognyx.com> wrote:
>> Carl Banks wrote:
>>> On May 22, 10:33 pm, Joel Ross <jo... at cognyx.com> wrote:
>>>> Hi all,
>>>> I'm using python 2.5 and trying to flush the sys.stout buffer with
>>>> sys.stout.flush(), but doesn't seem to work. Each time a line is printed
>>>>    it appends the one before it I need to clear the output and write a
>>>> new output without appending the previous one.
>>> That's not how streams work, chief.  Once you output (and flush)
>>> something you can't un-output it.
>>> What you probably want to do is to write a carriage return ("\r")
>>> which usually causes the cursor to return to the beginning of the
>>> line, so that any new text you write overwrites the old text.
>>> This has nothing to do with flushing; flushing doesn't erase or clear
>>> the old input.  Flushing is usually needed for a different reason,
>>> however, namely standard output doesn't actually get sent to the
>>> console until it sees a newline ("\n") unless you flush the buffer.
>>> Try to adapt this example to your problem:
>>> for i in xrange(11):
>>>     sys.stdout.write('*'*(10-i) + ' '*i + '\r')
>>>     sys.stdout.flush()
>>>     time.sleep(2)
>> Your example prints a new line each time,
> 
> Did you run it and observe what happened, or did you just guess what
> it actually did?  On my system it doesn't print new lines.
> 
> 
>> Doesn't help me with a
>> progress bar, do you know of anyway doing it with the print command? My
>> progress bars works fine this is the only problem im having with it at
>> the moment. any help would be appreciated.
> 
> Well, based on the code you posted it doesn't look like your progress
> bar is fine.
> 
> Anyway, you haven't described the problem you are having very well,
> and we can guess what might be wrong but if you want better help
> you're going to have to describe your problem more coherently.  Give
> us the
> 
> 1. What code are you actually running (cut-and-paste, please, don't
> retype).
> 2. What do you expect the code to output (type in actual output you
> expect to see, not merely a description).
> 3. What does the code actually output when you run it (cut-and paste,
> please, don't just describe).
> 4. Include any tracebacks if there are any.
> 
> In the meantime, I repeat my suggestion that you take my example and
> adapt it to what you are doing.
> 
> One other note: the print statement is unsuitable for this task
> because it always prints a trailing whitespace.  Use sys.stdout.write
> for it.
> 
> 
> Carl Banks
Hey,

The only reason I didn't supply full details is because I thought it may 
just be something simple I was missing. Sorry for the confusing. Well 
here's the full code.

import sys, os
from time import sleep


class progress:

     def progressbar(self, number, total,  char):

         percentage = float(number*100)/total
         percentage = int(round(percentage))
         percentage = int(100 - percentage)
         self.f=sys.stdout
         if percentage > 0:
             char = char * percentage
             self.f.write(char)
             self.f.flush()      	
             sleep(0.2)


     def countlines(self, file):

         lineCount = 0
         f = open(file)
         it = iter(f)
         try:
             while it.next():
                 lineCount += 1
         except StopIteration:
                     pass
         return lineCount


def main():

     p = progress()
     lines = 5
     #lines = p.countlines("/tmp/junk")
     count = lines
     for i in xrange(lines):
         p.progressbar(count, lines, "*")
         count -=1
     print "Finished"

if __name__ == "__main__":
         main()

For now we can ignore the countlines() function. I need a nice progress 
display e.g. ********************** continuing on til it reaches 100% I 
need this to print out on one line only. At the moment it does do this, 
only problem is its appends the print out from the last print out. I 
need it to clear the last print out and then print the new print out 
without appending the last.

So when it prints a progress at 50% it will print 50 (*) characters and 
if the next progress is 51% it will print 51 (*) characters including 
the last 50 (*) characters, so instead on ending up with 100 (*) 
characters I end up with a shit load of them depending on how many lines 
I pass to the progressbar() function.

Needed Output:
***************************************************************************************************Finished


Current Output:
********************************************************************************************************************************************************************************************************Finished

Note: As you can see I'm only sending 5 lines to the progressbar() 
function and It prints this many characters, so you could imagine if I 
have 10000 lines I would end up with a heap of * characters.

Regards
jross








From timothywayne.cook at gmail.com  Sat May 23 07:02:00 2009
From: timothywayne.cook at gmail.com (Tim Cook)
Date: Sat, 23 May 2009 04:02:00 -0700 (PDT)
Subject: Abstract Classes
Message-ID: <e31135b4-fc06-4b8c-be15-7872bc81eb1d@g37g2000yqn.googlegroups.com>

I am implementing a set of specifications that were designed to be OO
language neutral.

Several classes are specified as being abstract; so therefore there
should be no instances of them, correct?

However in the classes that are subclasses what is the correct way in
Python to implement them?
I am using the zope.interface module as well.

For example:

class IA(Interface):
   m = Int()
   p = TextLine()

class IB(Interface):

   x = Bool()
   s = Text()



class A(object):
""" This is an abstract class with attributes m is an int and p is a
string"""

   implements(IA)
   pass

class B(A):
  implements(IB)

  def __init__(self,m,p,x,s):
    m=m
    p=p
    x=x
    s=s


or should it be like:

class A(object):
""" This is an abstract class with attributes m is an int and p is a
string"""

   implements(IA)

   def __init__(self,m,p):
     m=m
     p=p


class B(A):
  implements(IB)

  def __init__(self,m,p,x,s):
    A.__init__(m,p)
    x=x
    s=s


or maybe even:

class B(A):
  implements(IB)

  def __init__(self,m,p,x,s):
    super(A.__init__(m,p))
    x=x
    s=s

Thanks for any pointers.

Tim


--
Timothy Cook, MSc
Health Informatics Research & Development Services
LinkedIn Profile:http://www.linkedin.com/in/timothywaynecook
Skype ID == timothy.cook
**************************************************************
*You may get my Public GPG key from  popular keyservers or   *
*from this link http://timothywayne.cook.googlepages.com/home*
**************************************************************


From pavlovevidence at gmail.com  Sat May 23 07:57:24 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 23 May 2009 04:57:24 -0700 (PDT)
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
Message-ID: <6ca8919e-2984-482b-b34c-8cde032ca456@o5g2000prh.googlegroups.com>

On May 23, 3:49?am, Joel Ross <jo... at cognyx.com> wrote:
> ? ? ?def progressbar(self, number, total, ?char):
>
> ? ? ? ? ?percentage = float(number*100)/total
> ? ? ? ? ?percentage = int(round(percentage))
> ? ? ? ? ?percentage = int(100 - percentage)
> ? ? ? ? ?self.f=sys.stdout
> ? ? ? ? ?if percentage > 0:
> ? ? ? ? ? ? ?char = char * percentage
> ? ? ? ? ? ? ?self.f.write(char)
> ? ? ? ? ? ? ?self.f.flush() ? ? ? ? ? ?
> ? ? ? ? ? ? ?sleep(0.2)
[snip]
> So when it prints a progress at 50% it will print 50 (*) characters and
> if the next progress is 51% it will print 51 (*) characters including
> the last 50 (*) characters, so instead on ending up with 100 (*)
> characters I end up with a shit load of them depending on how many lines
> I pass to the progressbar() function.

Here's why: when you write "char = char * percentage", you are setting
char to a string, so on the next iteration char is the string you
printed last time.  Thus char grows factorially with iterations.  Not
good.

Instead, change char to some other name so you don't ever overwrite
it; char should always be just one character.

             bar = char * percentage
             self.f.write(bar)


Carl Banks


From gdamjan at gmail.com  Sat May 23 08:13:21 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Sat, 23 May 2009 14:13:21 +0200
Subject: html ui + py background? any tut?
References: <mailman.614.1243064920.8015.python-list@python.org>
Message-ID: <2s5le6-u65.ln1@archaeopteryx.softver.org.mk>



> I have read for many times that the modern appliaction (not a web one,
> but desktop on) uses html + js for its UI, and python code is for the
> background work
> but I have never found event a simple (yet completed) article on how
> to develop such a thing from scrach in these advocacy thing.
> 
> Can anyone point out some simple, can-be-followed tutorial on such
> thing especially for windows os?

That's very very simple to do with PyQt and Qts Webkit. You can export 
Python objects to the HTML/JS application running in Webkit.

You'll just need to read the Qt Webkit documentation to see how it's all 
done.

This is actually a very good strategy for new apps, you can easily make 
them skinable with  html/js skins for ex.



-- 
?????? ( http://softver.org.mk/damjan/ )

Well when _I_ was in school, I had to run Netscape on HP/UX, displayed 
on my local X Server running on a Windows 3.1 box. Displayed over a 2400 
baud modem. Uphill. Both ways. In the rain. With NOBODY to hold my 
hands. Because the life of the geek is a lonely life.
- aclarke on /.



From inigoserna at gmail.com  Sat May 23 08:17:31 2009
From: inigoserna at gmail.com (=?UTF-8?B?ScOxaWdvIFNlcm5h?=)
Date: Sat, 23 May 2009 14:17:31 +0200
Subject: [OT] Python hunting
Message-ID: <65a1d6f80905230517w503f752bx5e4a4eebe1e83482@mail.gmail.com>

Hi,

excuse me for the off-topic, but today I've seen this video and...
and... well, it's amazing

http://dailymotion.virgilio.it/search/chasse%2Ben%2Bafrique/video/xz3rz_les-pythons-aiment-les-jambes_animals

It's in French, but the audio it's not important.

Kind regards,
I?igo Serna


From responsible7 at gmail.com  Sat May 23 08:49:56 2009
From: responsible7 at gmail.com (responsible7 at gmail.com)
Date: Sat, 23 May 2009 05:49:56 -0700 (PDT)
Subject: PureData py/pyExt into standalone python
Message-ID: <a3e7e823-2872-4a49-9d04-82058638aff3@z7g2000vbh.googlegroups.com>

Hi guys,

Short version:

I've written some python classes for py/pyExt extensions for the
"dataflow" graphical programming environment PureData. Here's an
example PureData screenshot for clarity:

	see: http://i40.tinypic.com/2rrx6gy.jpg

My classes talk to eachother via the PureData system, and they talk to
the outside world via pyPortMIDI (which enables raw MIDI data
communication).

PureData encourages modularisation, so I've written several classes:
* some that receive raw MIDI data,
* some that parse this into human-readable tokens,
* some that just generate human-readable tokens,
* and some that parse human-readable tokens then send raw MIDI data

I want to join these together as a stand-alone python application,
using internal python communication instead of PureData...

...but I don't know how to do this. The only python I know comes from
writing using the pyExt API, and the PureData API (which is written in
C).

----
Long(er) version:

Miller Pukette's PureData: http://puredata.info/
Thomas Grill's Flext: http://puredata.info/Members/thomas/flext
Thomas Grill's Py/Pyext: http://puredata.info/Members/thomas/py/
John Harrison's PyPortMIDI: http://www.media.mit.edu/~harrison/code.html
CMU's PortMIDI: http://www.cs.cmu.edu/~music/portmusic/

PureData is a graphical "dataflow" programming environment that (among
many, many other things!) allows for very rapid development of Audio
and MIDI processing. Objects in PureData (and MaxMSP) communicate by
sending messages through "patch cords" that connect an "outlet" to an
"inlet" of another object.

Thomas Grill's py/pyExt allows python code to be embedded as a
PureData object. The benefit being that this python code can be
effortlessly ported across multiple platforms (win32/linux/osx) and
also to the highly related (but more commercial) Cycling'74 MaxMSP
system. (PureData object code is written in C and generally not easy
to port between platforms, nor between PD and MaxMSP - so writing
portable python objects is a boon!)

a pyExt object sends messages from its outlets using the line:


	self._outlet(outlet_id,message_to_send)


a pyExt object performs actions when a message arrives at an inlet. An
integer arriving at inlet 1 could be attached to this method code:


	def int_1(self,*arg):
		print "received integer:",arg[0]

If these pieces of code were in separate python classes - how would I
connect two objects together such that an integer was passed between
the two?

If the first object sent 42, in puredata it would look like this:

http://i44.tinypic.com/15eh74p.gif

useless fact: the screenshot doubles up (i.e. "pyext sender sender")
due to the first word being the python file (i.e. sender.py), whilst
the second is the name of the object class (i.e class sender
(pyext._class)

----
Maybe a more tricky question is:

PureData supports "message busses" - messages sent to named busses can
be broadcast to multiple locations. How would I connect objects up in
this way using python?

a pyExt object registers to receive messages on a certain bus using:


	self._bind(bus_name,self.method_to_call)

	def method_to_call(self,*arg):
		print "a message on", bus_name, "arrived"
		print "the message was", len(arg), "long"
		print "and had the values", arg, "inside"


a pyExt object sends messages to a particular bus by using:


	self._send(bus_name,message_to_send)


From pigmartian at gmail.com  Sat May 23 09:00:15 2009
From: pigmartian at gmail.com (pigmartian at gmail.com)
Date: Sat, 23 May 2009 06:00:15 -0700 (PDT)
Subject: Replacing module with a stub for unit testing
Message-ID: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>

Hi,

I'm working on a unit test framework for a module.  The module I'm
testing indirectly calls another module which is expensive to access
--- CDLLs whose functions access a database.

    test_MyModule --->MyModule--->IntermediateModule---
>ExpensiveModule

I want to create a stub of ExpensiveModule and have that be accessed
by IntermediateModule instead of the real version

    test_MyModule --->MyModule--->IntermediateModule---
>ExpensiveModuleStub

I tried the following in my unittest:

    import ExpensiveModuleStub
    sys.modules['ExpensiveModule'] = ExpensiveModuleStub # Doesn't
work

But, import statements in the IntermediateModule still access the real
ExpensiveModule, not the stub.

The examples I can find of creating and using Mock or Stub objects
seem to all follow a pattern where the fake objects are passed in as
arguments to the code being tested.  For example, see the "Example
Usage" section here: http://python-mock.sourceforge.net.  But that
doesn't work in my case as the module I'm testing doesn't directly use
the module that I want to replace.

Can anybody suggest something?

Thanks,

Scott


From vincent at vincentdavis.net  Sat May 23 09:08:49 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sat, 23 May 2009 07:08:49 -0600
Subject: error in tutorial for 3.0, section 9.3.3
Message-ID: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>

Section 9.3.3 says that given,
class MyClass:
    """A simple example class"""
    i = 12345
    def f(self):
        return 'hello world'

and x = MyClass()
then this

x.counter = 1
while x.counter < 10:
    x.counter = x.counter * 2
print(x.counter)
del x.counter

will print 16

link,
http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes

I am reading this section so to learn about classes but if this is right I
think I need to start over.


Thanks
Vincent Davis
720-301-3003
-------------- next part --------------
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From vincent at vincentdavis.net  Sat May 23 09:13:29 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sat, 23 May 2009 07:13:29 -0600
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
Message-ID: <77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>

let me add that I see that this could be right if x.counter = 1 and counter
need not have anything to do with MyClass but this could be more clear.
Thanks
Vincent Davis
720-301-3003


On Sat, May 23, 2009 at 7:08 AM, Vincent Davis <vincent at vincentdavis.net>wrote:

> Section 9.3.3 says that given,
> class MyClass:
>     """A simple example class"""
>     i = 12345
>     def f(self):
>         return 'hello world'
>
> and x = MyClass()
> then this
>
> x.counter = 1
> while x.counter < 10:
>     x.counter = x.counter * 2
> print(x.counter)
> del x.counter
>
> will print 16
>
> link,
> http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes
>
> I am reading this section so to learn about classes but if this is right I
> think I need to start over.
>
>
> Thanks
> Vincent Davis
> 720-301-3003
>
-------------- next part --------------
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From ebonak at hotmail.com  Sat May 23 09:22:59 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 23 May 2009 09:22:59 -0400
Subject: Optimizing math functions
Message-ID: <gv8tbl$ph3$1@ger.gmane.org>

Hello all,

I would like to maximize or minimize a given math function over a
specific set of values, in Python preferably.

I was checking out Wolfram Alpha (http://www70.wolframalpha.com/)
and it can do simple optimization problems in math, such as

     maximize 15*x - x**2 over 0 to 15

     (http://www70.wolframalpha.com/input/?i=maximize+15*x+-+x**2+over+0+to+15)

which finds the maximum value and input for x in the range 0 to 15.
Very cool. (This is of course a very simple example).

What it apparently can't do is for maximize (or minimize) functions
that contain two variables, x and y, or more. So for example a simple
example would be

    maximize x**2 + y**2 over x:0 to 15, y:0-12  -- this does not work
                                                 -- though I'm unclear about
                                                 -- the correct syntax too.

Is there some sort of simple Python module that would allow me to
evaluate this type of function?

In this particular instance I am interested in the minimum of

   x * sin(4*x) + 1.1 * sin(2*y), where x,y in range 0-10

though in other problems the range may not be identical for x and y.

Thanks,

Esmail

ps: Does anyone know if Octave or some other free Linux (or Windows)
     program might also do this in a simple way? My preference would
     still be a Python solution that would be simple to use, ie plug in
     the function, the ranges and have it pop out the solution :-)



From albert at spenarnc.xs4all.nl  Sat May 23 09:24:46 2009
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 23 May 2009 13:24:46 GMT
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com>
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>
Message-ID: <kk3mla.lkl@spenarnc.xs4all.nl>

In article <43289c33-04b9-4cbc-9823-d8a4ee86dbba at y33g2000prg.googlegroups.com>,
godshorse  <chinthakawk at gmail.com> wrote:
>On May 13, 11:54=A0am, CTO <debat... at gmail.com> wrote:
>> On May 13, 12:10=A0am, godshorse <chinthak... at gmail.com> wrote:
>>
>> > Hello,
>>
>> > I want to find out the shortest path tree from a root to several nodes
>> > in a graph data structure. I found a Dijkstra code from internet that
>> > finds shortest path between only two nodes. How can i extend it to a
>> > tree?. And what is the best way to represent a tree in Python?.

<SNIP>

>
>Thanks very much for your reply Geremy. That site was interesting.
>
>Actually the Graph building part is already completed now. I used a
>dictionary for that and it works fine. for Dijkstra shortest path
>problem your suggestion can be used.
>
>But let me clear the my problem again. I have a graph. and I want to
>find 'shortest path tree' from a root node to several nodes. as a
>example if we have a graph of 5 nodes from 1 to 5, I need to build the
>shortest path tree from node 1 to nodes 2,3,5. So my question is
>instead of keeping separate lists for each destination node's shortest
>path. How can I represent and store them in a tree structure using
>python. Then I can easily find out what are the common nodes in the
>path to each destination.

If I understand correctly, you want to know the path given
the end-node. Common sense dictates that you use back links
if that has to be done with decent efficiency.
The back links can be added as part of the algorithm.

>
>Thanks once again.

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- like all pyramid schemes -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From steve at REMOVE-THIS-cybersource.com.au  Sat May 23 09:25:05 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 23 May 2009 13:25:05 GMT
Subject: Replacing module with a stub for unit testing
References: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>
Message-ID: <0033d39f$0$9725$c3e8da3@news.astraweb.com>

On Sat, 23 May 2009 06:00:15 -0700, pigmartian wrote:

> Hi,
> 
> I'm working on a unit test framework for a module.  The module I'm
> testing indirectly calls another module which is expensive to access ---
> CDLLs whose functions access a database.
...
> The examples I can find of creating and using Mock or Stub objects seem
> to all follow a pattern where the fake objects are passed in as
> arguments to the code being tested.  For example, see the "Example
> Usage" section here: http://python-mock.sourceforge.net.  But that
> doesn't work in my case as the module I'm testing doesn't directly use
> the module that I want to replace.
> 
> Can anybody suggest something?

Sounds like a job for monkey-patching!

Currently, you have this:

# inside test_MyModule:
import MyModule
test_code()


# inside MyModule:
import IntermediateModule


# inside IntermediateModule:
import ExpensiveModule


You want to leave MyModule and IntermediateModule as they are, but 
replace ExpensiveModule with MockExpensiveModule. Try this:

# inside test_MyModule:
import MyModule
import MockExpensiveModule
MyModule.IntermediateModule.ExpensiveModule = MockExpensiveModule
test_code()



That should work, unless IntermediateModule uses "from ExpensiveModule 
import functions" instead of "import ExpensiveModule". In that case, you 
will have to monkey-patch each individual object rather than the entire 
module:

MyModule.IntermediateModule.afunc = MockExpensiveModule.afunc
MyModule.IntermediateModule.bfunc = MockExpensiveModule.bfunc
MyModule.IntermediateModule.cfunc = MockExpensiveModule.cfunc
# etc...



-- 
Steven


From ben+python at benfinney.id.au  Sat May 23 09:27:51 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sat, 23 May 2009 23:27:51 +1000
Subject: Replacing module with a stub for unit testing
References: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>
Message-ID: <878wkoymnc.fsf@benfinney.id.au>

pigmartian at gmail.com writes:

> 
>     import ExpensiveModuleStub
>     sys.modules['ExpensiveModule'] = ExpensiveModuleStub # Doesn't
> work
> 
> But, import statements in the IntermediateModule still access the real
> ExpensiveModule, not the stub.
> 
> The examples I can find of creating and using Mock or Stub objects
> seem to all follow a pattern where the fake objects are passed in as
> arguments to the code being tested. For example, see the "Example
> Usage" section here: http://python-mock.sourceforge.net. But that
> doesn't work in my case as the module I'm testing doesn't directly use
> the module that I want to replace.
> 
> Can anybody suggest something?

The ?MiniMock? library <URL:http://pypi.python.org/pypi/MiniMock>
addresses this by mocking objects via namespace.

If you know the code under test will import ?spam.eggs.beans?, import
that yourself in your unit test module, then mock the object with
?minimock.mock('spam.eggs.beans')?. Whatever object was at that name
will be mocked (until ?minimock.restore()?), and other code referring to
that name will get the mocked object.

-- 
 \     ?When I turned two I was really anxious, because I'd doubled my |
  `\   age in a year. I thought, if this keeps up, by the time I'm six |
_o__)                                  I'll be ninety.? ?Steven Wright |
Ben Finney


From steve at REMOVE-THIS-cybersource.com.au  Sat May 23 09:55:43 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 23 May 2009 13:55:43 GMT
Subject: Optimizing math functions
References: <mailman.619.1243084999.8015.python-list@python.org>
Message-ID: <0033dace$0$9725$c3e8da3@news.astraweb.com>

On Sat, 23 May 2009 09:22:59 -0400, Esmail wrote:

> Hello all,
> 
> I would like to maximize or minimize a given math function over a
> specific set of values, in Python preferably.
...
> What it apparently can't do is for maximize (or minimize) functions that
> contain two variables, x and y, or more. 

Function minimization is a well-studied problem. You will find oodles of 
references to doing function minimization if you google. In fact, if you 
google for "python function minimization" you should find about 63,000 
links.

Minimizing functions of two variables is difficult, as a general rule. 
Nevertheless, there are tools for doing so. Check out SciPy.



-- 
Steven


From ebonak at hotmail.com  Sat May 23 10:06:09 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 23 May 2009 10:06:09 -0400
Subject: Optimizing math functions
In-Reply-To: <0033dace$0$9725$c3e8da3@news.astraweb.com>
References: <mailman.619.1243084999.8015.python-list@python.org>
	<0033dace$0$9725$c3e8da3@news.astraweb.com>
Message-ID: <4A1802D1.8070603@hotmail.com>

Steven D'Aprano wrote:
> On Sat, 23 May 2009 09:22:59 -0400, Esmail wrote:
> 
>> Hello all,
>>
>> I would like to maximize or minimize a given math function over a
>> specific set of values, in Python preferably.
> ...
>> What it apparently can't do is for maximize (or minimize) functions that
>> contain two variables, x and y, or more. 
> 
> Function minimization is a well-studied problem. You will find oodles of 
> references to doing function minimization if you google. In fact, if you 
> google for "python function minimization" you should find about 63,000 
> links.

Hi Steven,

Right you are (63,700!) ... I don't know what search string I used
before, but clearly not this rather obvious one .. duh.


> Minimizing functions of two variables is difficult, as a general rule. 
> Nevertheless, there are tools for doing so. Check out SciPy.

I will - thanks. I have tools for 1D, I mostly am interested in 2D
optimization at this point, mostly as a way to verifying some results
I am calculating.

Hopefully SciPy will provide a nice simple interface to help me do
this.

Thanks,
Esmail



From stefaan.himpe at gmail.com  Sat May 23 10:16:54 2009
From: stefaan.himpe at gmail.com (Stefaan Himpe)
Date: Sat, 23 May 2009 16:16:54 +0200
Subject: html ui + py background? any tut?
In-Reply-To: <mailman.614.1243064920.8015.python-list@python.org>
References: <mailman.614.1243064920.8015.python-list@python.org>
Message-ID: <qzTRl.6949$Bc.3306@newsfe29.ams2>

Perhaps you want to investigate
pyjamas[1] and pyjamas-desktop[2]

[1] http://pyjs.org/
[2] http://pyjd.sourceforge.net/

Best regards,
Stefaan.


From ebonak at hotmail.com  Sat May 23 10:20:15 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 23 May 2009 10:20:15 -0400
Subject: Python -> R?
Message-ID: <gv90n1$1h4$1@ger.gmane.org>

Hello!

Anyone using Python scripts and accessing some of R's functionality?
If so, what are you using? I have read about RPy, is that a good
solution? Are there others that can be recommended or are preferred?

I would prefer to code in Python instead of R :-)

Thanks,
Esmail



From stefaan.himpe at gmail.com  Sat May 23 10:23:06 2009
From: stefaan.himpe at gmail.com (Stefaan Himpe)
Date: Sat, 23 May 2009 16:23:06 +0200
Subject: html ui + py background? any tut?
In-Reply-To: <mailman.614.1243064920.8015.python-list@python.org>
References: <mailman.614.1243064920.8015.python-list@python.org>
Message-ID: <eFTRl.6962$Bc.6756@newsfe29.ams2>

Or maybe you are looking for something like nufox?
http://nufox.berlios.de/


From benjamin.kaplan at case.edu  Sat May 23 10:24:53 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 23 May 2009 10:24:53 -0400
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
	<77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>
Message-ID: <ec96e1390905230724r65fe59cbue1d0e68ca5dcdbdb@mail.gmail.com>

On Sat, May 23, 2009 at 9:13 AM, Vincent Davis <vincent at vincentdavis.net>wrote:

> let me add that I see that this could be right if x.counter = 1 and
> counter need not have anything to do with MyClass but this could be more
> clear.
> Thanks
> Vincent Davis
> 720-301-3003
>
>
> On Sat, May 23, 2009 at 7:08 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>
>> Section 9.3.3 says that given,
>> class MyClass:
>>     """A simple example class"""
>>     i = 12345
>>     def f(self):
>>         return 'hello world'
>>
>> and x = MyClass()
>> then this
>>
>> x.counter = 1
>> while x.counter < 10:
>>     x.counter = x.counter * 2
>> print(x.counter)
>> del x.counter
>>
>> will print 16
>>
>> link,
>> http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes
>>
>> I am reading this section so to learn about classes but if this is right I
>> think I need to start over.
>>
>>
The code given is correct, though the description in the tutorial could be
clearer. Basically, a class in Python is represented by a dict with strings
mapping to other stuff. Internally, x.counter = 1 is just a shortcut for
x.__dict__['counter'] = 1. This appears in the code as dynamically adding
the variable "counter" to the instance of MyClass. Unlike in static
languages, an instance variable in python doesn't need to be declared inside
the class for you to use it. It also doesn't need to appear in every
instance of the class.

The last line in the code (del x.counter) removes the "counter" key from x
so that the instance variable disappears. That's how the code works "without
leaving a trace".




>
>> Thanks
>> Vincent Davis
>> 720-301-3003
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From joelc at cognyx.com  Sat May 23 10:44:21 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sun, 24 May 2009 00:44:21 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <6ca8919e-2984-482b-b34c-8cde032ca456@o5g2000prh.googlegroups.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<6ca8919e-2984-482b-b34c-8cde032ca456@o5g2000prh.googlegroups.com>
Message-ID: <0227fec4$0$25479$c3e8da3@news.astraweb.com>

Carl Banks wrote:
> On May 23, 3:49 am, Joel Ross <jo... at cognyx.com> wrote:
>>      def progressbar(self, number, total,  char):
>>
>>          percentage = float(number*100)/total
>>          percentage = int(round(percentage))
>>          percentage = int(100 - percentage)
>>          self.f=sys.stdout
>>          if percentage > 0:
>>              char = char * percentage
>>              self.f.write(char)
>>              self.f.flush()            
>>              sleep(0.2)
> [snip]
>> So when it prints a progress at 50% it will print 50 (*) characters and
>> if the next progress is 51% it will print 51 (*) characters including
>> the last 50 (*) characters, so instead on ending up with 100 (*)
>> characters I end up with a shit load of them depending on how many lines
>> I pass to the progressbar() function.
> 
> Here's why: when you write "char = char * percentage", you are setting
> char to a string, so on the next iteration char is the string you
> printed last time.  Thus char grows factorially with iterations.  Not
> good.
> 
> Instead, change char to some other name so you don't ever overwrite
> it; char should always be just one character.
> 
>              bar = char * percentage
>              self.f.write(bar)
> 
> 
> Carl Banks


Still having the same problem if I pass it 1000 lines it will printout 
1000 asterisks when I say lines I mean the argument <number> for the 
progress() function. I only want to printout 100 asterisks no matter how 
many lines I pass to the progress() function, that's why I need the 
printout to overwrite the last printout instead of appending to the last 
printout. I know there must be a way to do it. I'll keep trying and 
eventually get it. Any ideas would be helpful

jross


From vincent at vincentdavis.net  Sat May 23 10:46:39 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sat, 23 May 2009 08:46:39 -0600
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <ec96e1390905230724r65fe59cbue1d0e68ca5dcdbdb@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
	<77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>
	<ec96e1390905230724r65fe59cbue1d0e68ca5dcdbdb@mail.gmail.com>
Message-ID: <77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>

Thank you that makes sense to me. Much more clear then the tutorial, I think
so anyway. If you are learning about classes that you kinda expect MyClass
to have counter in it. I might be nice to show that x.counter = 1 creates an
instance that would look like (is this correct?)

class MyClass:
    """A simple example class"""
    i = 12345
    counter = 1
    def f(self):
        return 'hello world'

Thanks again

Vincent Davis


On Sat, May 23, 2009 at 8:24 AM, Benjamin Kaplan
<benjamin.kaplan at case.edu>wrote:

>
>
> On Sat, May 23, 2009 at 9:13 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>
>> let me add that I see that this could be right if x.counter = 1 and
>> counter need not have anything to do with MyClass but this could be more
>> clear.
>> Thanks
>> Vincent Davis
>> 720-301-3003
>>
>>
>> On Sat, May 23, 2009 at 7:08 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>>
>>> Section 9.3.3 says that given,
>>> class MyClass:
>>>     """A simple example class"""
>>>     i = 12345
>>>     def f(self):
>>>         return 'hello world'
>>>
>>> and x = MyClass()
>>> then this
>>>
>>> x.counter = 1
>>> while x.counter < 10:
>>>     x.counter = x.counter * 2
>>> print(x.counter)
>>> del x.counter
>>>
>>> will print 16
>>>
>>> link,
>>> http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes
>>>
>>> I am reading this section so to learn about classes but if this is right
>>> I think I need to start over.
>>>
>>>
> The code given is correct, though the description in the tutorial could be
> clearer. Basically, a class in Python is represented by a dict with strings
> mapping to other stuff. Internally, x.counter = 1 is just a shortcut for
> x.__dict__['counter'] = 1. This appears in the code as dynamically adding
> the variable "counter" to the instance of MyClass. Unlike in static
> languages, an instance variable in python doesn't need to be declared inside
> the class for you to use it. It also doesn't need to appear in every
> instance of the class.
>
> The last line in the code (del x.counter) removes the "counter" key from x
> so that the instance variable disappears. That's how the code works "without
> leaving a trace".
>
>
>
>
>>
>>> Thanks
>>> Vincent Davis
>>> 720-301-3003
>>>
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From motoom at xs4all.nl  Sat May 23 11:04:52 2009
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Sat, 23 May 2009 17:04:52 +0200
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>	<77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>	<ec96e1390905230724r65fe59cbue1d0e68ca5dcdbdb@mail.gmail.com>
	<77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>
Message-ID: <4A181094.40007@xs4all.nl>


Vincent writes:

 > you kinda expect MyClass to have counter in it.

Yeah, that makes sense. These instance variables are often initialized 
in the __init__ method:


class Counter(object):
     def __init__(self,initialvalue):
         self.value=initialvalue
     def inc(self):
         self.value+=1
     def dec(self):
         self.value-=1

beans=Counter(123)
beans.inc()
beans.inc()
beans.dec()
print beans.value

# the output of the program is: 124

Greetings,


-- 
"The ability of the OSS process to collect and harness
the collective IQ of thousands of individuals across
the Internet is simply amazing." - Vinod Valloppillil
http://www.catb.org/~esr/halloween/halloween4.html


From __peter__ at web.de  Sat May 23 11:12:10 2009
From: __peter__ at web.de (Peter Otten)
Date: Sat, 23 May 2009 17:12:10 +0200
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
Message-ID: <gv93nv$b6b$00$1@news.t-online.com>

Joel Ross wrote:

> class progress:
> 
>      def progressbar(self, number, total,  char):
> 
>          percentage = float(number*100)/total
>          percentage = int(round(percentage))
>          percentage = int(100 - percentage)
>          self.f=sys.stdout
>          if percentage > 0:
>              char = char * percentage

Carl probably overlooked that you didn't follow his advice. If you want to 
overwrite the current line you have to send a "\r" to the terminal. Change

>              self.f.write(char)

to
               self.f.write("\r" + char)

>              self.f.flush()
>              sleep(0.2)





From davea at ieee.org  Sat May 23 11:20:15 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 23 May 2009 11:20:15 -0400
Subject: Problems with sys.stout.flush()
In-Reply-To: <0033af48$0$9681$c3e8da3@news.astraweb.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
Message-ID: <4A18142F.2080403@ieee.org>

Joel Ross wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">Carl 
> Banks wrote:
>> On May 23, 2:20 am, Joel Ross <jo... at cognyx.com> wrote:
>>> Carl Banks wrote:
>>>> On May 22, 10:33 pm, Joel Ross <jo... at cognyx.com> wrote:
>>>>> Hi all,
>>>>> I'm using python 2.5 and trying to flush the sys.stout buffer with
>>>>> sys.stout.flush(), but doesn't seem to work. Each time a line is 
>>>>> printed
>>>>>    it appends the one before it I need to clear the output and 
>>>>> write a
>>>>> new output without appending the previous one.
>>>> That's not how streams work, chief.  Once you output (and flush)
>>>> something you can't un-output it.
>>>> What you probably want to do is to write a carriage return ("\r")
>>>> which usually causes the cursor to return to the beginning of the
>>>> line, so that any new text you write overwrites the old text.
>>>> This has nothing to do with flushing; flushing doesn't erase or clear
>>>> the old input.  Flushing is usually needed for a different reason,
>>>> however, namely standard output doesn't actually get sent to the
>>>> console until it sees a newline ("\n") unless you flush the buffer.
>>>> Try to adapt this example to your problem:
>>>> for i in xrange(11):
>>>>     sys.stdout.write('*'*(10-i) + ' '*i + '\r')
>>>>     sys.stdout.flush()
>>>>     time.sleep(2)
>>> Your example prints a new line each time,
>>
>> Did you run it and observe what happened, or did you just guess what
>> it actually did?  On my system it doesn't print new lines.
>>
>>
>>> Doesn't help me with a
>>> progress bar, do you know of anyway doing it with the print command? My
>>> progress bars works fine this is the only problem im having with it at
>>> the moment. any help would be appreciated.
>>
>> Well, based on the code you posted it doesn't look like your progress
>> bar is fine.
>>
>> Anyway, you haven't described the problem you are having very well,
>> and we can guess what might be wrong but if you want better help
>> you're going to have to describe your problem more coherently.  Give
>> us the
>>
>> 1. What code are you actually running (cut-and-paste, please, don't
>> retype).
>> 2. What do you expect the code to output (type in actual output you
>> expect to see, not merely a description).
>> 3. What does the code actually output when you run it (cut-and paste,
>> please, don't just describe).
>> 4. Include any tracebacks if there are any.
>>
>> In the meantime, I repeat my suggestion that you take my example and
>> adapt it to what you are doing.
>>
>> One other note: the print statement is unsuitable for this task
>> because it always prints a trailing whitespace.  Use sys.stdout.write
>> for it.
>>
>>
>> Carl Banks
> Hey,
>
> The only reason I didn't supply full details is because I thought it 
> may just be something simple I was missing. Sorry for the confusing. 
> Well here's the full code.
>
> import sys, os
> from time import sleep
>
>
> class progress:
>
>     def progressbar(self, number, total,  char):
>
>         percentage = float(number*100)/total
>         percentage = int(round(percentage))
>         percentage = int(100 - percentage)
>         self.f=sys.stdout
>         if percentage > 0:
>             char = char * percentage
>             self.f.write(char)
>             self.f.flush()         
>             sleep(0.2)
>
>
>     def countlines(self, file):
>
>         lineCount = 0
>         f = open(file)
>         it = iter(f)
>         try:
>             while it.next():
>                 lineCount += 1
>         except StopIteration:
>                     pass
>         return lineCount
>
>
> def main():
>
>     p = progress()
>     lines = 5
>     #lines = p.countlines("/tmp/junk")
>     count = lines
>     for i in xrange(lines):
>         p.progressbar(count, lines, "*")
>         count -=1
>     print "Finished"
>
> if __name__ == "__main__":
>         main()
>
> For now we can ignore the countlines() function. I need a nice 
> progress display e.g. ********************** continuing on til it 
> reaches 100% I need this to print out on one line only. At the moment 
> it does do this, only problem is its appends the print out from the 
> last print out. I need it to clear the last print out and then print 
> the new print out without appending the last.
>
> So when it prints a progress at 50% it will print 50 (*) characters 
> and if the next progress is 51% it will print 51 (*) characters 
> including the last 50 (*) characters, so instead on ending up with 100 
> (*) characters I end up with a shit load of them depending on how many 
> lines I pass to the progressbar() function.
>
> Needed Output:
> ***************************************************************************************************Finished 
>
>
>
> Current Output:
> ********************************************************************************************************************************************************************************************************Finished 
>
>
> Note: As you can see I'm only sending 5 lines to the progressbar() 
> function and It prints this many characters, so you could imagine if I 
> have 10000 lines I would end up with a heap of * characters.
>
> Regards
> jross
>
>
You don't tell your environment.  Like, what version of Python, and more 
importantly what operating system?  You also don't say how you're 
testing the system, nor where it's intended to finally run.

There is no portable way to say "erase those charcters I sent earlier, I 
didn't mean it."  flush() does nothing even close to that.

In a standard console (at least on Windows), adding a simple \r   (*NOT* 
\n) would work easily, as Carl Banks already suggested.  However, in 
some shells (I test with Komodo), it does not.

So, you have a couple of choices, depending on your environment.  The 
simplest is to do a cursor-position operation, specific to your 
particular output "device."  Nobody can reliably help you with that 
without knowing what the environment is.

More complex for a forward-moving progress bar is to simply keep track 
of how many stars have already been output, and only add the additional 
ones you want.  in your current incarnation, the percentage value shows 
20, then 40, then 60, then 80  (it never reaches 100, but maybe that's 
okay).  Currently you're printing all those stars over again.  This 
solution would be to print only the difference, or 20 more stars each time.

A way to accomplish that would be to create a counter in the progress 
class, that knows how many stars have already been output.  Something like:

class progress:

    def __init__(self):
        self.already = 0              #number of stars already displayed

    def progressbar(self, number, total,  char):

        percentage = float(number*100)/total
        percentage = int(round(percentage))
        percentage = int(100 - percentage)
        self.f=sys.stdout
        if percentage > 0:
            char = char * (percentage-self.already)
            self.already = percentage
            self.f.write(char + "X")    #note:  remove the "X" when 
you're sure it's working
            self.f.flush()
            sleep(0.2)

Clearly the self.write() function should change to simply    
self.write(char)  when you're confident it's working.  For now, it gives 
you a marker to see how it's being pieced together.

Incidentally, Carl's other suggestion, that you use a new variable 
instead of overwriting 'char', is a red herring.  It's good advice to 
never change your parameters in place, and for mutable data types, could 
be a problem.  But because char is a string, this is not your problem.




From seattlehanks at yahoo.com  Sat May 23 11:32:24 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sat, 23 May 2009 08:32:24 -0700 (PDT)
Subject: from __future__ import absolute_import issue
References: <1aeb486c-eef8-453c-8d04-fd831a84f8e2@g22g2000pra.googlegroups.com>
	<mailman.562.1242978117.8015.python-list@python.org>
Message-ID: <5d6c964f-8973-4aef-9b86-fa8b3f6855d7@f37g2000pro.googlegroups.com>

On May 22, 12:42?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 20 May 2009 20:18:02 -0300, LittleGrasshopper ?
> <seattleha... at yahoo.com> escribi?:
>
> > New to the group, this is my first post...
>
> > It appears that either absolute imports (or my brain) aren't working.
> > Given a module string.py which is in the same directory as a.py:
>
> > #File a.py
> > from __future__ import absolute_import
>
> > import string
>
> > print string # Module imported is string.py in current directory, not
> > standard library module
>
> absolute_import helps with imports inside a package (those are "relative" ?
> imports, relative to the package). If a module is located in a directory ?
> listed in sys.path, an absolute import will find it. I don't think there ?
> is a way to avoid shadowing a standard module (other than ensuring the ?
> standard directories come first in sys.path).
>
> --
> Gabriel Genellina

You are right. If you have a directory in your PYTHONPATH before the
standard library directories that has a string module, for example,
absolute_import will not help you. I was getting confused by the fact
that when I print sys.path from the python shell, the first entry is
an empty string.
This empty string must denote the current directory though, because:

['', '/usr/lib/python25.zip', '/usr/lib/python2.5', '/usr/lib/
python2.5/plat-linux2', '/usr/lib/python2.5/lib-tk', '/usr/lib/
python2.5/lib-dynload', '/usr/local/lib/python2.5/site-packages', '/
usr/lib/python2.5/site-packages', '/usr/lib/python2.5/site-packages/
Numeric', '/usr/lib/python2.5/site-packages/PIL', '/usr/lib/python2.5/
site-packages/gst-0.10', '/var/lib/python-support/python2.5', '/usr/
lib/python2.5/site-packages/gtk-2.0', '/var/lib/python-support/
python2.5/gtk-2.0']

When I have this sys.path, doing an "import string" from a module
where I have absolute imports enabled will still import the string
module in the package (which also means it is in the same directory in
this case.) So I think my string.py is being imported not because it
is in the same package, but because the home directory is searched
first. The empty string doesn't make much sense though (at least in a
Unix system, you would imagine it would be something like './') but I
guess that synce Python is platform independent, the empty string is
taken to denote the current directory.

Thanks for your help.


From benjamin.kaplan at case.edu  Sat May 23 11:35:48 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 23 May 2009 11:35:48 -0400
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
	<77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>
	<ec96e1390905230724r65fe59cbue1d0e68ca5dcdbdb@mail.gmail.com>
	<77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>
Message-ID: <ec96e1390905230835y7f830905g5857fab417ce0440@mail.gmail.com>

On Sat, May 23, 2009 at 10:46 AM, Vincent Davis <vincent at vincentdavis.net>wrote:

> Thank you that makes sense to me. Much more clear then the tutorial, I
> think so anyway. If you are learning about classes that you kinda expect
> MyClass to have counter in it. I might be nice to show that x.counter = 1
> creates an instance that would look like (is this correct?)
>
> class MyClass:
>     """A simple example class"""
>     i = 12345
>     counter = 1
>     def f(self):
>         return 'hello world'
>

That's how it would work in almost any language other than Python. In
Python, anything declared in that scope is a member of the class. For
something immutable like an int, it doesn't matter. If you can change it
however, you get problems. This is one of the biggest sources of problems
for python beginners (you get the same behavior with default method
arguments btw)

>>> class Foo :
...    lst = []
...
>>> a = Foo()
>>> b = Foo()
>>> b.lst
[]
>>> a.lst.append(1)
>>> b.lst
[1]



In Python, if you want something to be a part of the instance, you have to
add it to the instance. That's what the "self" parameter in the method
argument list is. x.f() is just syntax sugar for MyClass.f(x). Dynamically
adding variables can get very confusing, so people usually declare
everything (or almost everything) they're going to use in the __init__
method discussed in section 9.3.2.


>
>

> Thanks again


> Vincent Davis
>
>
>
> On Sat, May 23, 2009 at 8:24 AM, Benjamin Kaplan <benjamin.kaplan at case.edu
> > wrote:
>
>>
>>
>> On Sat, May 23, 2009 at 9:13 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>>
>>> let me add that I see that this could be right if x.counter = 1 and
>>> counter need not have anything to do with MyClass but this could be more
>>> clear.
>>> Thanks
>>> Vincent Davis
>>> 720-301-3003
>>>
>>>
>>> On Sat, May 23, 2009 at 7:08 AM, Vincent Davis <vincent at vincentdavis.net
>>> > wrote:
>>>
>>>> Section 9.3.3 says that given,
>>>> class MyClass:
>>>>     """A simple example class"""
>>>>     i = 12345
>>>>     def f(self):
>>>>         return 'hello world'
>>>>
>>>> and x = MyClass()
>>>> then this
>>>>
>>>> x.counter = 1
>>>> while x.counter < 10:
>>>>     x.counter = x.counter * 2
>>>> print(x.counter)
>>>> del x.counter
>>>>
>>>> will print 16
>>>>
>>>> link,
>>>> http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes
>>>>
>>>> I am reading this section so to learn about classes but if this is right
>>>> I think I need to start over.
>>>>
>>>>
>> The code given is correct, though the description in the tutorial could be
>> clearer. Basically, a class in Python is represented by a dict with strings
>> mapping to other stuff. Internally, x.counter = 1 is just a shortcut for
>> x.__dict__['counter'] = 1. This appears in the code as dynamically adding
>> the variable "counter" to the instance of MyClass. Unlike in static
>> languages, an instance variable in python doesn't need to be declared inside
>> the class for you to use it. It also doesn't need to appear in every
>> instance of the class.
>>
>> The last line in the code (del x.counter) removes the "counter" key from x
>> so that the instance variable disappears. That's how the code works "without
>> leaving a trace".
>>
>>
>>
>>
>>>
>>>> Thanks
>>>> Vincent Davis
>>>> 720-301-3003
>>>>
>>>
>>>
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From steve at REMOVE-THIS-cybersource.com.au  Sat May 23 11:47:41 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 23 May 2009 15:47:41 GMT
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<6ca8919e-2984-482b-b34c-8cde032ca456@o5g2000prh.googlegroups.com>
	<0227fec4$0$25479$c3e8da3@news.astraweb.com>
Message-ID: <0033f50b$0$9725$c3e8da3@news.astraweb.com>

On Sun, 24 May 2009 00:44:21 +1000, Joel Ross wrote:

> Still having the same problem if I pass it 1000 lines it will printout
> 1000 asterisks when I say lines I mean the argument <number> for the
> progress() function. I only want to printout 100 asterisks no matter how
> many lines I pass to the progress() function, that's why I need the
> printout to overwrite the last printout instead of appending to the last
> printout. 

No, you're confusing two different problems:

(1) Scale the width of the progress bar to 100 characters;

(2) Make the progress bar appear on one line instead of multiple lines.


To solve the *second* problem, use the hint already given by Carl Banks.

To solve the *first* problem, use mathematics, then re-do your method, 
because your method is wrong. Before you can write code to solve this 
problem, you first have to get the mathematics right: you want to scale 
the width of the progress bar to be 100 asterisks no matter how many 
lines you have.

(a) If you have exactly 100 lines, and you draw one asterisk per line, 
then you get a progress bar of exactly 100 asterisks.

(b) If you have 50 lines, and you want a progress bar of exactly 100 
asterisks, you need to draw *two* asterisks per line.

(c) If you have 200 lines, and you want a progress bar of exactly 100 
asterisks, you need to draw *one half* an asterisk per line (or one 
asterisk per *two* lines).

(d) If you have N lines, and you want a progress bar of exactly 100 
asterisks, each line must be equivalent to [____] asterisks.

Once you have filled in the blank, then go back to writing code.


Some further hints: I've added some commentary to your code:

def progressbar(self, number, total,  char):
    percentage = float(number*100)/total
    percentage = int(round(percentage))
    percentage = int(100 - percentage)
    # Why not combine all of the above into one line?
    # percentage = int(100 - round(number*100.0/total))

    self.f=sys.stdout
    # Why are you storing stdout as an attribute to the method? Unless 
    # you will need it again elsewhere, this is a waste.

    if percentage > 0:
        char = char * percentage
        # Carl Banks has already pointed out the problem here.

        self.f.write(char)
        self.f.flush()
        # Better written like this:
        # sys.stdout.write(char)
        # sys.stdout.flush()

        sleep(0.2)


Finally, here's a function that should do what you ask for:

from __future__ import division
import sys

def progressbar(number, total, char='*', maxwidth=100):
    done = number/total
    if not 0 <= done <= 1:
        raise ValueError('number or total out of range')
    # Scale done=1 => maxwidth chars.
    s = int(done*maxwidth)*char
    sys.stdout.write(s + '\r')
    sys.stdout.flush()
    sleep(0.2)

This should work in "normal" terminal windows (tested on Linux, should 
work on Windows and Mac too) but some IDEs may mess it up.




-- 
Steven


From davea at ieee.org  Sat May 23 12:48:05 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 23 May 2009 12:48:05 -0400
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
Message-ID: <4A1828C5.4050603@ieee.org>

Vincent Davis wrote:
> Section 9.3.3 says that given,
> class MyClass:
>     """A simple example class"""
>     i = 12345
>     def f(self):
>         return 'hello world'
>
> and x = MyClass()
> then this
>
> x.counter = 1
> while x.counter < 10:
>     x.counter = x.counter * 2
> print(x.counter)
> del x.counter
>
> will print 16
>
> link,
> http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes
>
> I am reading this section so to learn about classes but if this is right I
> think I need to start over.
>
>
> Thanks
> Vincent Davis
> 720-301-3003
>
>   
Yes, this code will display 16, and it's not specific to 3.0, but works 
in earlier Pythons as well.

I'm not sure why you're puzzled;  it could be the question of why 16, 
but i suspect it's because you can't see who creates this x attribute.

Unlike languages like Java and C++, object attributes are not fixed at 
the time the class is compiled.  Some attributes are created by the 
placement of the code, for example the method name f.  But others are 
created in the code of the class (typically the __init__() method), and 
others can be created by anyone, at any time.

I don't know why the tutorial starts with this, but it illustrates that 
an object is really just a container for attributes, some of which are 
callable (methods), and some of which are data (what Java would call 
fields).  Anybody with an object reference can create, modify or delete 
those attributes.  If it's being done inside the class methods, you use 
the syntax  self.counter.  But it also works outside, as you see.


From joelc at cognyx.com  Sat May 23 13:19:11 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sun, 24 May 2009 03:19:11 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <0033af48$0$9681$c3e8da3@news.astraweb.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
Message-ID: <02282310$0$20616$c3e8da3@news.astraweb.com>

Thanks for all the help guys. I got it to work correctly with this

class progress:

     def __init__(self):
        self.already = 0

     def progressbar(self, number, total,  char):

        percentage = int(100 - round(number*100.0/total))
        if percentage > 0:
            xchar = char * (percentage-self.already)
            self.already = percentage
            sys.stdout.write(xchar)
            sys.stdout.flush()
            sleep(1)

Keeping track of the characters that had already been printed solved my 
main problem thanks Dave and everyone else for helping me out with this 
issue. Now I can move onto next one.

jross


From davea at ieee.org  Sat May 23 13:48:46 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 23 May 2009 13:48:46 -0400
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>	<77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>	<ec96e1390905230724r65fe59cbue1d0e68ca5dcdbdb@mail.gmail.com>
	<77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>
Message-ID: <4A1836FE.3000504@ieee.org>

Vincent Davis wrote:
> Thank you that makes sense to me. Much more clear then the tutorial, I think
> so anyway. If you are learning about classes that you kinda expect MyClass
> to have counter in it. I might be nice to show that x.counter = 1 creates an
> instance that would look like (is this correct?)
>
> class MyClass:
>     """A simple example class"""
>     i = 12345
>     counter = 1
>     def f(self):
>         return 'hello world'
>
> Thanks again
>
> Vincent Davis
>
>
> On Sat, May 23, 2009 at 8:24 AM, Benjamin Kaplan
> <benjamin.kaplan at case.edu>wrote:
>
>   
>> On Sat, May 23, 2009 at 9:13 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>>
>>     
>>> let me add that I see that this could be right if x.counter = 1 and
>>> counter need not have anything to do with MyClass but this could be more
>>> clear.
>>> Thanks
>>> Vincent Davis
>>> 720-301-3003
>>>
>>>
>>> On Sat, May 23, 2009 at 7:08 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>>>
>>>       
>>>> Section 9.3.3 says that given,
>>>> class MyClass:
>>>>     """A simple example class"""
>>>>     i = 12345
>>>>     def f(self):
>>>>         return 'hello world'
>>>>
>>>> and x = MyClass()
>>>> then this
>>>>
>>>> x.counter = 1
>>>> while x.counter < 10:
>>>>     x.counter = x.counter * 2
>>>> print(x.counter)
>>>> del x.counter
>>>>
>>>> will print 16
>>>>
>>>> link,
>>>> http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes
>>>>
>>>> I am reading this section so to learn about classes but if this is right
>>>> I think I need to start over.
>>>>
>>>>
>>>>         
>> The code given is correct, though the description in the tutorial could be
>> clearer. Basically, a class in Python is represented by a dict with strings
>> mapping to other stuff. Internally, x.counter = 1 is just a shortcut for
>> x.__dict__['counter'] = 1. This appears in the code as dynamically adding
>> the variable "counter" to the instance of MyClass. Unlike in static
>> languages, an instance variable in python doesn't need to be declared inside
>> the class for you to use it. It also doesn't need to appear in every
>> instance of the class.
>>
>> The last line in the code (del x.counter) removes the "counter" key from x
>> so that the instance variable disappears. That's how the code works "without
>> leaving a trace".
>>
>>
>>
>>
>>     
>>>> Thanks
>>>> Vincent Davis
>>>> 720-301-3003
>>>>
>>>>         
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>>>
>>>       
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>>     
(You accidentally top-posted.  That makes the context much harder for 
others to follow.)

No, the attribute 'counter' you demonstrated is an attribute of the 
class.  To duplicate what  x.counter=1 does, you have to add it to the 
instance.  Normally, this would be done in the __init__() method, but 
that would put it in each instance of the class, as it's being created.  
But this one is only in the 'x' instance.




From cooldudevamsee at gmail.com  Sat May 23 14:31:48 2009
From: cooldudevamsee at gmail.com (samba)
Date: Sat, 23 May 2009 11:31:48 -0700 (PDT)
Subject: How to pass multiline flag to re.sub without using re.complie.
Message-ID: <5830da28-b9db-49cc-bacc-6488fc1ede18@a5g2000pre.googlegroups.com>

I have a regex that needs multiline flag. Some where I read I can pass
multiline flag in regex string itself without using re.compile. If
anybody have any idea about how to do that please reply.


From daywednes at gmail.com  Sat May 23 14:55:02 2009
From: daywednes at gmail.com (Minh Doan)
Date: Sat, 23 May 2009 11:55:02 -0700
Subject: need a help!
Message-ID: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>

Hi,

I'm a newbie to python. I am having stuck with the following problem. I want
to download the info(price) from fromcity to tocity at a certain time from
kayak.com website. If we do it manually, we can go to the website, choose
the appropriate info we want to get and press SEARCH. How can i do it in
python ?

I hope someone could help me deal with the problem.
Thanks
----
Minh Doan
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From kushal.kumaran at gmail.com  Sat May 23 15:17:02 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Sun, 24 May 2009 00:47:02 +0530
Subject: need a help!
In-Reply-To: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>
References: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>
Message-ID: <1e364c4e0905231217n3e294ccai1fdd4de5fbe18d2d@mail.gmail.com>

On Sun, May 24, 2009 at 12:25 AM, Minh Doan <daywednes at gmail.com> wrote:
> Hi,
>
> I'm a newbie to python. I am having stuck with the following problem. I want
> to download the info(price) from fromcity to tocity at a certain time from
> kayak.com website. If we do it manually, we can go to the website, choose
> the appropriate info we want to get and press SEARCH. How can i do it in
> python ?
>

You can automate interaction with web pages using the mechanize
library.  See http://wwwsearch.sourceforge.net/mechanize/

Or you can examine what data gets sent to the web server when you
click SEARCH, and send that data using the urllib2 module in the
standard library.  The library documentation has examples.

-- 
kushal


From ebonak at hotmail.com  Sat May 23 15:25:47 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 23 May 2009 15:25:47 -0400
Subject: need a help!
In-Reply-To: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>
References: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>
Message-ID: <4A184DBB.2090407@hotmail.com>

Minh Doan wrote:
> Hi,
> 
> I'm a newbie to python. I am having stuck with the following problem. I 
> want to download the info(price) from fromcity to tocity at a certain 
> time from kayak.com <http://kayak.com/> website. If we do it manually, 
> we can go to the website, choose the appropriate info we want to get and 
> press SEARCH. How can i do it in python ?
> 
> I hope someone could help me deal with the problem.
> Thanks
> ----
> Minh Doan
> 

For Kayak, see this page:

      http://www.kayak.com/labs/gateway/doc/air.vtl

and here's a sample query for 2 flights

#!/usr/bin/env python

#
# search for 2 flights on Kayak.com
#

import webbrowser

url1='http://www.kayak.com/s/search/air?l1=cid&d1=4/23/2009&l2=yyz&d2=4/26/2009'
url2='http://www.kayak.com/s/search/air?l1=cid&d1=6/22/2009&l2=fra&d2=3/17/2009'

webbrowser.open_new_tab(url1);
webbrowser.open_new_tab(url2);



From pavlovevidence at gmail.com  Sat May 23 16:12:55 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 23 May 2009 13:12:55 -0700 (PDT)
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<mailman.627.1243092031.8015.python-list@python.org>
Message-ID: <ddea5acf-29ed-49f0-a9dc-2f1e5ccc343f@d2g2000pra.googlegroups.com>

On May 23, 8:20?am, Dave Angel <da... at ieee.org> wrote:
> Incidentally, Carl's other suggestion, that you use a new variable
> instead of overwriting 'char', is a red herring.

Yeah, I dropped the ball on this one, I misread his code as being in a
loop instead of being called repeatedly.  And after criticizing him
for not running mine....

Sorry bout that.


Carl Banks


From davea at ieee.org  Sat May 23 16:19:34 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 23 May 2009 16:19:34 -0400
Subject: need a help!
In-Reply-To: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>
References: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>
Message-ID: <4A185A56.8040500@ieee.org>

Minh Doan wrote:
> Hi,
>
> I'm a newbie to python. I am having stuck with the following problem. I want
> to download the info(price) from fromcity to tocity at a certain time from
> kayak.com website. If we do it manually, we can go to the website, choose
> the appropriate info we want to get and press SEARCH. How can i do it in
> python ?
>
> I hope someone could help me deal with the problem.
> Thanks
> ----
> Minh Doan
>
>   
I'd start by researching the following two links.

http://www.kayak.com/labs/
http://www.programmableweb.com/api/kayak

You'll need to register with them to get an affiliate id, but this 
should get you started.



From python.list at tim.thechases.com  Sat May 23 16:20:31 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Sat, 23 May 2009 15:20:31 -0500
Subject: How to pass multiline flag to re.sub without using re.complie.
In-Reply-To: <5830da28-b9db-49cc-bacc-6488fc1ede18@a5g2000pre.googlegroups.com>
References: <5830da28-b9db-49cc-bacc-6488fc1ede18@a5g2000pre.googlegroups.com>
Message-ID: <4A185A8F.9040304@tim.thechases.com>

> I have a regex that needs multiline flag. Some where I read I
> can pass multiline flag in regex string itself without using
> re.compile. If anybody have any idea about how to do that
> please reply.


As detailed at [1],

"""
(?iLmsux)

(One or more letters from the set 'i', 'L', 'm', 's', 'u', 'x'.) 
The group matches the empty string; the letters set the 
corresponding flags: re.I (ignore case), re.L (locale dependent), 
re.M (multi-line), re.S (dot matches all), re.U (Unicode 
dependent), and re.X (verbose), for the entire regular 
expression. (The flags are described in Module Contents.) This is 
useful if you wish to include the flags as part of the regular 
expression, instead of passing a flag argument to the compile() 
function.
"""

So you should be able to insert "(?m)" at the beginning of your 
regexp to make it multiline.

-tkc


[1]
http://docs.python.org/library/re.html






From google at mrabarnett.plus.com  Sat May 23 16:45:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 23 May 2009 21:45:59 +0100
Subject: How to pass multiline flag to re.sub without using re.complie.
In-Reply-To: <5830da28-b9db-49cc-bacc-6488fc1ede18@a5g2000pre.googlegroups.com>
References: <5830da28-b9db-49cc-bacc-6488fc1ede18@a5g2000pre.googlegroups.com>
Message-ID: <4A186087.6090301@mrabarnett.plus.com>

samba wrote:
> I have a regex that needs multiline flag. Some where I read I can pass
> multiline flag in regex string itself without using re.compile. If
> anybody have any idea about how to do that please reply.

Include "(?m)" in the regular expression for multiline matching. It's 
best to put it at the start.


From walterbyrd at iname.com  Sat May 23 17:05:10 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Sat, 23 May 2009 14:05:10 -0700 (PDT)
Subject: When does the escape character work within raw strings?
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
	<mailman.600.1243016575.8015.python-list@python.org>
Message-ID: <99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>

On May 22, 12:22?pm, "Rhodri James"
> How do you know how a string object is going to be treated by any
> given function? ?Read the Fine Manual for that function.

So am I to understand that there is no consistency in string handling
throughout the standard modules/objects/methods?

Seems to make python a lot more complicated than it needs to be, but
okay.



From robert.kern at gmail.com  Sat May 23 17:21:46 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 23 May 2009 16:21:46 -0500
Subject: Optimizing math functions
In-Reply-To: <gv8tbl$ph3$1@ger.gmane.org>
References: <gv8tbl$ph3$1@ger.gmane.org>
Message-ID: <gv9pda$t3s$1@ger.gmane.org>

On 2009-05-23 08:22, Esmail wrote:
> Hello all,
>
> I would like to maximize or minimize a given math function over a
> specific set of values, in Python preferably.
>
> I was checking out Wolfram Alpha (http://www70.wolframalpha.com/)
> and it can do simple optimization problems in math, such as
>
> maximize 15*x - x**2 over 0 to 15
>
> (http://www70.wolframalpha.com/input/?i=maximize+15*x+-+x**2+over+0+to+15)
>
> which finds the maximum value and input for x in the range 0 to 15.
> Very cool. (This is of course a very simple example).
>
> What it apparently can't do is for maximize (or minimize) functions
> that contain two variables, x and y, or more. So for example a simple
> example would be
>
> maximize x**2 + y**2 over x:0 to 15, y:0-12 -- this does not work
> -- though I'm unclear about
> -- the correct syntax too.
>
> Is there some sort of simple Python module that would allow me to
> evaluate this type of function?
>
> In this particular instance I am interested in the minimum of
>
> x * sin(4*x) + 1.1 * sin(2*y), where x,y in range 0-10
>
> though in other problems the range may not be identical for x and y.

We have several bounded optimization routines in scipy.

http://docs.scipy.org/doc/scipy/reference/optimize.html

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Sat May 23 17:29:23 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 23 May 2009 16:29:23 -0500
Subject: When does the escape character work within raw strings?
In-Reply-To: <99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>	<mailman.459.1242842772.8015.python-list@python.org>	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>	<mailman.554.1242963859.8015.python-list@python.org>	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>	<mailman.600.1243016575.8015.python-list@python.org>
	<99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
Message-ID: <gv9prj$uhm$1@ger.gmane.org>

On 2009-05-23 16:05, walterbyrd wrote:
> On May 22, 12:22 pm, "Rhodri James"
>> How do you know how a string object is going to be treated by any
>> given function?  Read the Fine Manual for that function.
>
> So am I to understand that there is no consistency in string handling
> throughout the standard modules/objects/methods?
>
> Seems to make python a lot more complicated than it needs to be, but
> okay.

*Any* language would have such issues. Different functions do different things 
to its inputs. That's why you have different functions. I certainly wouldn't 
want my HTML parser to treat its inputs as if they were regular expressions.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From bottleh20 at gmail.com  Sat May 23 17:32:57 2009
From: bottleh20 at gmail.com (Water Bottle)
Date: Sat, 23 May 2009 17:32:57 -0400
Subject: Problems with StaticBitmaps and events
Message-ID: <c8a21b110905231432q175a3ebay8111f4cf37dc4977@mail.gmail.com>

Hi, I'm new to wxpython and I created a test program. So far, it works, but
there are some problems with it.

For some reason, I get a small box in the top left corner. Not sure why
that's happening.

Also, I can't get my picture to bind to my Play().

Lastly, do you recommend using StaticBitmap as a button? I don't want to use
the wx.Button because I want to create my own custom buttons with its own
borders and such.



I've attached my png.





import wx

class Frame(wx.Frame):
    def __init__(self, parent, ID, title):
        wx.Frame.__init__(self, parent, ID, title, wx.DefaultPosition,
wx.Size(400,400))

        self.sizer=wx.BoxSizer(wx.VERTICAL)
        self.sizer.Add(Box(self,-1).sizer,1,wx.EXPAND)
        self.sizer.Add(Picture(self,-1).sizer,0,wx.EXPAND)

        self.SetSizer(self.sizer)
        self.SetAutoLayout(1)
        self.Show(1)

class Picture(wx.Panel):
    def __init__(self, parent, ID):
        wx.Panel.__init__(self, parent, ID)

        bitmap =
wx.Bitmap("/home/kevin/programming/python/media/data/arrow_blue.png",
wx.BITMAP_TYPE_PNG)
        self.pic = wx.StaticBitmap(parent, ID, bitmap, wx.Point(30,120),
wx.Size(20,20), 0, "Name")

        self.pic.Bind(wx.EVT_BUTTON, self.Play)

        # Add more pictures later

        # Layout
        self.sizer = wx.GridSizer(1,10,0,0)
        self.sizer.AddMany([(self.pic,1,wx.EXPAND),
                ])

    def Play(self, event):
        print "Hello"


class Box(wx.Panel):
    def __init__(self, parent, ID):
        wx.Panel.__init__(self, parent, ID)
        self.control = wx.TextCtrl(parent, 1, style=wx.TE_MULTILINE)

        # Layout
        self.sizer = wx.BoxSizer(wx.HORIZONTAL)
        self.sizer.Add(self.control, 1, wx.EXPAND)


class myApp(wx.App):
    def OnInit(self):
        frame = Frame(None, -1, "Test")
        frame.Show()
        self.SetTopWindow(frame)
        return 1

app = myApp(0)
app.MainLoop()



Thanks!
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From rhodri at wildebst.demon.co.uk  Sat May 23 17:59:47 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 23 May 2009 22:59:47 +0100
Subject: Abstract Classes
In-Reply-To: <e31135b4-fc06-4b8c-be15-7872bc81eb1d@g37g2000yqn.googlegroups.com>
References: <e31135b4-fc06-4b8c-be15-7872bc81eb1d@g37g2000yqn.googlegroups.com>
Message-ID: <op.uuekpxm3a8ncjz@gnudebst>

On Sat, 23 May 2009 12:02:00 +0100, Tim Cook <timothywayne.cook at gmail.com>  
wrote:

> I am implementing a set of specifications that were designed to be OO
> language neutral.
>
> Several classes are specified as being abstract; so therefore there
> should be no instances of them, correct?
>
> However in the classes that are subclasses what is the correct way in
> Python to implement them?

That very much depends on the classes, and how much the abstract classes
do.  With the very simple examples you give which have no methods even,
I'd be strongly tempted not to implement the classes at all.  But let's
assume that's not a good idea (and there are plenty of reasons for it
not to be a good idea, to be fair).

Caution: I am not in the slightest bit familiar with the zope.interface
module, which does make your IA and IB classes look exceptionally
pointless.  Again, it's fairly safe to presume that I'm wrong there :-)

> I am using the zope.interface module as well.
>
> For example:
>
> class IA(Interface):
>    m = Int()
>    p = TextLine()
>
> class IB(Interface):
>
>    x = Bool()
>    s = Text()
>
>
>
> class A(object):
> """ This is an abstract class with attributes m is an int and p is a
> string"""
>
>    implements(IA)
>    pass
>
> class B(A):
>   implements(IB)
>
>   def __init__(self,m,p,x,s):
>     m=m
>     p=p
>     x=x
>     s=s

Presumably you mean
     self.m = m
     self.p = p
and so on?

This doesn't seem to be a consistent approach.  Class B enforces
initialisation of all its attributes, including the inherited ones,
but class A doesn't.

> or should it be like:
>
> class A(object):
> """ This is an abstract class with attributes m is an int and p is a
> string"""
>
>    implements(IA)
>
>    def __init__(self,m,p):
>      m=m
>      p=p
>
>
> class B(A):
>   implements(IB)
>
>   def __init__(self,m,p,x,s):
>     A.__init__(m,p)
>     x=x
>     s=s

Modulo the "self." as before, this is more consistent.

> or maybe even:
>
> class B(A):
>   implements(IB)
>
>   def __init__(self,m,p,x,s):
>     super(A.__init__(m,p))
>     x=x
>     s=s

I have a bit of an allergy to super() because it works in slightly
unexpected ways.  Here in particular it doesn't gain you anything
and may cost you instead.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Sat May 23 18:23:11 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 23 May 2009 23:23:11 +0100
Subject: Problems with sys.stout.flush()
In-Reply-To: <02282310$0$20616$c3e8da3@news.astraweb.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<02282310$0$20616$c3e8da3@news.astraweb.com>
Message-ID: <op.uuelsxwsa8ncjz@gnudebst>

On Sat, 23 May 2009 18:19:11 +0100, Joel Ross <joelc at cognyx.com> wrote:

> Now I can move onto next one.

Except that you still have the interesting issue that your environment
isn't responding to '\r' correctly, which worries me rather.  Or did
you never test that?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Sat May 23 18:34:15 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 23 May 2009 23:34:15 +0100
Subject: When does the escape character work within raw strings?
In-Reply-To: <99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
	<mailman.600.1243016575.8015.python-list@python.org>
	<99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
Message-ID: <op.uuembd1xa8ncjz@gnudebst>

On Sat, 23 May 2009 22:05:10 +0100, walterbyrd <walterbyrd at iname.com>  
wrote:

> On May 22, 12:22?pm, "Rhodri James"
>> How do you know how a string object is going to be treated by any
>> given function? ?Read the Fine Manual for that function.
>
> So am I to understand that there is no consistency in string handling
> throughout the standard modules/objects/methods?

How can there be?  They all have different requirements, after all.
In C, for example, you wouldn't expect "^\\s*[qwerty]+" to be remotely
useful as a printf() format, but it might be exactly what you want for
some regular expression library.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From apt.shansen at gmail.com  Sat May 23 18:36:06 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sat, 23 May 2009 15:36:06 -0700
Subject: When does the escape character work within raw strings?
In-Reply-To: <99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
	<mailman.600.1243016575.8015.python-list@python.org>
	<99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
Message-ID: <7a9c25c20905231536n3363ed9fuee18db13c18ff9e5@mail.gmail.com>

>
> > How do you know how a string object is going to be treated by any
> > given function?  Read the Fine Manual for that function.
>
> So am I to understand that there is no consistency in string handling
> throughout the standard modules/objects/methods?
>
> Seems to make python a lot more complicated than it needs to be, but
> okay.
>

What it seems like you're not understanding here is that regular expressions
are a special case.

\b means something in Python literals. It maps to a single character, \x08.
It _is_ a single character.

r"\b" is two characters, a slash followed by a b.

Regular expressions have an _entire_ range of their own special characters
that have nothing to do with Python special characters. For regular
expressions, \b -- that is, a slash followed by a b -- are TWO characters
(not one, like "\b" is to Python) that have special meaning.

Raw strings really exist SO you can do this. So you can do r"\b" and have
the slash-followed-by-b be encoded into two characters, which the re library
can then threat as a test for the blank string. Otherwise, you'd have to do
"\\b" and similar a LOT when building up regular expressions...

The re library just has its own rules for how it interprets strings. Its not
"no consistency". Its that regular expressions have meaning outside of
Python and Python's implementation follows that general meaning (some,
mostly, or to some other definition of how much).

--S
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From notontheweb at noisp.com  Sat May 23 18:49:51 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Sat, 23 May 2009 15:49:51 -0700
Subject: Cursor movement question
In-Reply-To: <gv6n8h$olu$1@panix3.panix.com>
References: <3cmRl.90415$iW4.57403@en-nntp-01.dc1.easynews.com>
	<wxoRl.328387$Yx2.227908@en-nntp-06.dc1.easynews.com>
	<gv6n8h$olu$1@panix3.panix.com>
Message-ID: <p4%Rl.11694$2p1.9417@en-nntp-08.dc1.easynews.com>

Aahz wrote:
> In article <wxoRl.328387$Yx2.227908 at en-nntp-06.dc1.easynews.com>,
> Jive Dadson  <notontheweb at noisp.com> wrote:
>> Gosh, you guys are slow. :-) I figured it out.
> 
> Perhaps you could post the solution for posterity's sake?

The double secret magic encantation is "WarpPointer."  Unfortunately, it 
does not work in a plain vanilla ScrolledWindow. ScrolledWindow captures 
the event and scrolls by the default scroll amount of 20 pixels. I think 
I can figure out a work-around, but I have not yet done so.

self.bmp.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)

def OnKeyDown(self, event):
         # Use direction keys to move cursor one pixel

         x,y = event.GetPosition()
         keycode = event.GetKeyCode()
         X = 0
         Y = 0
         if keycode == wx.WXK_LEFT:
             X = -1
         elif keycode == wx.WXK_RIGHT:
             X = 1
         elif keycode == wx.WXK_UP:
             Y = -1
         elif keycode == wx.WXK_DOWN:
             Y = 1
	else:
	    return

         x = max(0,min(self.size[0]-1,x+X))
         y = max(0,min(self.size[1]-1,y+Y))
         self.bmp.WarpPointer(x, y)
         self.bmp.SetFocus()


From notontheweb at noisp.com  Sat May 23 18:55:24 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Sat, 23 May 2009 15:55:24 -0700
Subject: wxPython gurus, please help
Message-ID: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>

    I have an application that opens an image file of the user's choice. 
   I have an exception handler for the case that the user selected a bad 
or unsupported image file.  My code is catching the exception, but 
unfortunately for me, after I exit the except-clause, wxPython is 
popping up its own message dialog from somewhere in deepest, darkest 
__core__.

    How do I make it not do that?

    Thankee much,
    Jive


From rzzzwilson at gmail.com  Sat May 23 20:28:07 2009
From: rzzzwilson at gmail.com (rzzzwilson at gmail.com)
Date: Sat, 23 May 2009 17:28:07 -0700 (PDT)
Subject: wxpython and zoom/pan image
Message-ID: <e5092503-1254-4dd5-a36f-83844b9d11f0@d19g2000prh.googlegroups.com>

Hi,

I've googled for this, but can only find things like openlayers that
is a web-based javascript solution.

I need to display an image at various zoom levels and want to allow
the user to pan around in the Google maps style, that is, left-click
hold and drag.  The code should also action double-clicks on the image
(but that's easy).

There are no 'standard' wxpython widgets that allow this.  Can anyone
point me to information on how to implement such a thing, or maybe
some working code?

Thanks,
Ross


From joelc at cognyx.com  Sat May 23 20:29:38 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sun, 24 May 2009 10:29:38 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <mailman.642.1243117397.8015.python-list@python.org>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>	<0033af48$0$9681$c3e8da3@news.astraweb.com>	<02282310$0$20616$c3e8da3@news.astraweb.com>
	<mailman.642.1243117397.8015.python-list@python.org>
Message-ID: <00346f94$0$9732$c3e8da3@news.astraweb.com>

Rhodri James wrote:
> On Sat, 23 May 2009 18:19:11 +0100, Joel Ross <joelc at cognyx.com> wrote:
> 
>> Now I can move onto next one.
> 
> Except that you still have the interesting issue that your environment
> isn't responding to '\r' correctly, which worries me rather.  Or did
> you never test that?
> 
Yeah I gave the "\r" a go and it kept printing out on a new line I will 
look into it.

Thanks for the heads up


From joelc at cognyx.com  Sat May 23 20:31:32 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sun, 24 May 2009 10:31:32 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <mailman.634.1243108131.8015.python-list@python.org>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<mailman.634.1243108131.8015.python-list@python.org>
Message-ID: <00347006$0$9732$c3e8da3@news.astraweb.com>

Dennis Lee Bieber wrote:
> 	flush() is working perfectly fine -- it says transmit any data still
> held within internal buffers. It is NOT a "clear screen", "clear line"
> terminal command.

I was mistaken about the sys.stout.flush(). I understand it a little 
more now thanks


From benjamin.kaplan at case.edu  Sat May 23 21:18:32 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 23 May 2009 21:18:32 -0400
Subject: wxPython gurus, please help
In-Reply-To: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>
References: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>
Message-ID: <ec96e1390905231818g5d4de9c4t29da7e98ea81afff@mail.gmail.com>

On Sat, May 23, 2009 at 6:55 PM, Jive Dadson <notontheweb at noisp.com> wrote:

>   I have an application that opens an image file of the user's choice.  I
> have an exception handler for the case that the user selected a bad or
> unsupported image file.  My code is catching the exception, but
> unfortunately for me, after I exit the except-clause, wxPython is popping up
> its own message dialog from somewhere in deepest, darkest __core__.
>
>   How do I make it not do that?
>

Hard to tell without seeing the relevant code. Try stripping down the
program until you get to the smallest program that still shows the error (
http://wiki.wxpython.org/MakingSampleApps). If you can't figure it out from
that, try asking on the wxPython mailing list (
http://lists.wxwidgets.org/mailman/listinfo/wxpython-users). You'll probably
get better advice there.
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From davea at ieee.org  Sat May 23 21:29:46 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 23 May 2009 21:29:46 -0400
Subject: wxpython and zoom/pan image
In-Reply-To: <e5092503-1254-4dd5-a36f-83844b9d11f0@d19g2000prh.googlegroups.com>
References: <e5092503-1254-4dd5-a36f-83844b9d11f0@d19g2000prh.googlegroups.com>
Message-ID: <4A18A30A.6050708@ieee.org>

rzzzwilson at gmail.com wrote:
> Hi,
>
> I've googled for this, but can only find things like openlayers that
> is a web-based javascript solution.
>
> I need to display an image at various zoom levels and want to allow
> the user to pan around in the Google maps style, that is, left-click
> hold and drag.  The code should also action double-clicks on the image
> (but that's easy).
>
> There are no 'standard' wxpython widgets that allow this.  Can anyone
> point me to information on how to implement such a thing, or maybe
> some working code?
>
> Thanks,
> Ross
>
>   
These are all (?) of the pieces in my working image display program.  It 
rotates and scales.  It's an exercise to the reader to divide it up.  
For example, you don't want to rerun all of this every time the mouse
drags a little.  So these are in two different places, where the first 
group only happens when you change the image file, or rotate by an angle 
other than 90 degrees
            self._img = wx.Image(self.fname, wx.BITMAP_TYPE_ANY)
            self._img = wx.EmptyImage(42, 42, True)  #create a plain 
black image, 42 x 42 pixels
            self._img = self._img.Rotate90()
            self._img = self._img.Rotate(-radians, center)

        img2 = img1.Scale(self.imageW()*scale/1000, 
self.imageH()*scale/1000)    #this is where image is scaled to final bit 
dimensions.  It's clipped during drawBitmap()
        tracer("drawStuff  Scale", "draw")
        bmp = wx.BitmapFromImage(img2)

        w, h = self.GetClientSize()                         #self is a 
subclass of Panel
        self.buffer = wx.EmptyBitmap(w, h)
        dc = wx.BufferedDC(wx.ClientDC(self), self.buffer)
        dc.DrawBitmap(bmp, cornerX, cornerY, False)

Hope this helps.  I tied the scaling to the mousewheel, and used drag to 
move the cornerX and cornerY.  Notice they can go negative, as well as 
positive.




From mwilson at the-wire.com  Sat May 23 21:33:49 2009
From: mwilson at the-wire.com (Mel)
Date: Sat, 23 May 2009 21:33:49 -0400
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<02282310$0$20616$c3e8da3@news.astraweb.com>
	<mailman.642.1243117397.8015.python-list@python.org>
	<00346f94$0$9732$c3e8da3@news.astraweb.com>
Message-ID: <gva85s$a9p$1@services.telesweet.net>

Joel Ross wrote:
> Rhodri James wrote:
[ ... ]
>> Except that you still have the interesting issue that your environment
>> isn't responding to '\r' correctly, which worries me rather.  Or did
>> you never test that?

> Yeah I gave the "\r" a go and it kept printing out on a new line I will
> look into it.

Are you running an Apple computer?

	Mel.




From steve at REMOVE-THIS-cybersource.com.au  Sat May 23 21:34:25 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 24 May 2009 01:34:25 GMT
Subject: When does the escape character work within raw strings?
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
	<mailman.600.1243016575.8015.python-list@python.org>
	<99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
Message-ID: <00347e91$0$9679$c3e8da3@news.astraweb.com>

On Sat, 23 May 2009 14:05:10 -0700, walterbyrd wrote:

> On May 22, 12:22?pm, "Rhodri James"
>> How do you know how a string object is going to be treated by any given
>> function? ?Read the Fine Manual for that function.
> 
> So am I to understand that there is no consistency in string handling
> throughout the standard modules/objects/methods?

No, you have completely misunderstood.


> Seems to make python a lot more complicated than it needs to be, but
> okay.

No, you are imagining complexity that doesn't exist.

To the Python compiler, a string is a string is a string. The rules are 
very simple: you write a string literal using quotation marks to tell the 
compiler "the text between these delimiters are a literal string". Here 
are the delimiters understood by Python:


Regular strings, must be on a single line:
'  '  or  "  "

Regular strings, allowed to include multiple lines:
'''  '''  or  """  """

Raw strings, must be on a single line:
r'  '  or  r"  "

Raw strings, allowed to include multiple lines:
r'''  '''  or  r"""  """

Regular strings interpret backslash escapes specially: \c has special 
meaning depending on what c is. For example, \t is interpreted by the 
compiler as a tab, and \n is interpreted as a newline. Raw strings 
*don't* interpret backslashes specially (except that you can't end the 
raw string with an odd number of backslashes).

That is how you *create* string literals. It is 100% consistent all 
through Python: the rules apply in every module, in every function, 
everywhere, because the compiler creates the string before the function 
or module gets a chance to see the string.

Having been created, how the string is *used* depends on the application, 
and Python modules and functions are no different. Inside a calculator 
application, the meaning of the literal string "x/y" would be very 
different than it would be inside an application dealing with file names. 
Python modules are no different:

- the os module interprets many strings as file names according to the 
rules for your operating system: e.g. on Linux '/' separates parts of the 
pathname into sub-directories. On Windows, either forward or backslashes 
are used to separate directories, and ':' is used to separate drive 
letters from the path.

- the glob module interprets strings according to the rules for shell 
globbing: e.g. '*' means 'match any number of any character', '?' means 
'match a single of any character'.

- the re module interprets strings according to the rules for regular 
expressions: e.g. '.*' means 'match any number of any character (except 
newline by default)' and '\d' (backslash-d) means 'match a single decimal 
digit'.

- the urllib and urllib2 modules interpret strings according to the rules 
of dealing with URLs.


In every case, you construct the string literals using the same rules, 
but the *meaning* of them differs according to the application. Because 
regular expressions give special meanings to literal backslashes, it is 
inconvenient to create many regexes using regular strings, because you 
need to escape the backslashes. That's where raw strings are more useful.





-- 
Steven


From gagsl-py2 at yahoo.com.ar  Sat May 23 21:39:09 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 23 May 2009 22:39:09 -0300
Subject: from __future__ import absolute_import issue
References: <1aeb486c-eef8-453c-8d04-fd831a84f8e2@g22g2000pra.googlegroups.com>
	<mailman.562.1242978117.8015.python-list@python.org>
	<5d6c964f-8973-4aef-9b86-fa8b3f6855d7@f37g2000pro.googlegroups.com>
Message-ID: <op.uueuvj12x6zn5v@gabriel.sleipnir-bsas>

En Sat, 23 May 2009 12:32:24 -0300, LittleGrasshopper  
<seattlehanks at yahoo.com> escribi?:

> On May 22, 12:42?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Wed, 20 May 2009 20:18:02 -0300, LittleGrasshopper ?
>> <seattleha... at yahoo.com> escribi?:
>>
>> > It appears that either absolute imports (or my brain) aren't working.
>> > Given a module string.py which is in the same directory as a.py:
>>
>> > #File a.py
>> > from __future__ import absolute_import
>> > import string
>> > print string # Module imported is string.py in current directory, not
>> > standard library module
>>
>> absolute_import helps with imports inside a package (those are  
>> "relative" ?
>> imports, relative to the package). If a module is located in a  
>> directory ?
>> listed in sys.path, an absolute import will find it. I don't think  
>> there ?
>> is a way to avoid shadowing a standard module (other than ensuring the ?
>> standard directories come first in sys.path).
>
> You are right. If you have a directory in your PYTHONPATH before the
> standard library directories that has a string module, for example,
> absolute_import will not help you. I was getting confused by the fact
> that when I print sys.path from the python shell, the first entry is
> an empty string.
> This empty string must denote the current directory though, because:
>
> ['', '/usr/lib/python25.zip', '/usr/lib/python2.5', '/usr/lib/ ...]
>
> When I have this sys.path, doing an "import string" from a module
> where I have absolute imports enabled will still import the string
> module in the package (which also means it is in the same directory in
> this case.)

Mmm, I don't understand this. Do you mean that the current directory is a  
package (that is, it contains an __init__.py file? And the main script is  
there? Then, from Python's POV, it is NOT a package; packages are  
recognized only at import time; if you execute a script that happens to be  
inside a package directory, Python is not aware of the "packageness" of  
such directory.
In that case, all imports are absolute.
The current directory should not be a package (at least, not a package  
accessible from sys.path), nasty things may happen.

> So I think my string.py is being imported not because it
> is in the same package, but because the home directory is searched
> first.

Yes.

> The empty string doesn't make much sense though (at least in a
> Unix system, you would imagine it would be something like './') but I
> guess that synce Python is platform independent, the empty string is
> taken to denote the current directory.

Maybe you're surprised, but I don't think it's strange at all. Nobody  
writes open("./foo.txt") instead of open("foo.txt"), and  
os.path.normpath("./foo.txt") is actually "foo.txt". Having no path  
specification means "use the current directory" (at least in all OS that I  
know of, where "process' current directory" makes any sense)

-- 
Gabriel Genellina



From joelc at cognyx.com  Sat May 23 22:32:59 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sun, 24 May 2009 12:32:59 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <gva85s$a9p$1@services.telesweet.net>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<02282310$0$20616$c3e8da3@news.astraweb.com>
	<mailman.642.1243117397.8015.python-list@python.org>
	<00346f94$0$9732$c3e8da3@news.astraweb.com>
	<gva85s$a9p$1@services.telesweet.net>
Message-ID: <0228a4d8$0$19301$c3e8da3@news.astraweb.com>

Mel wrote:
> Joel Ross wrote:
>> Rhodri James wrote:
> [ ... ]
>>> Except that you still have the interesting issue that your environment
>>> isn't responding to '\r' correctly, which worries me rather.  Or did
>>> you never test that?
> 
>> Yeah I gave the "\r" a go and it kept printing out on a new line I will
>> look into it.
> 
> Are you running an Apple computer?
> 
> 	Mel.
> 
> 
No running a Linux fedora 9 box


From paulprobert at sbcglobal.net  Sat May 23 23:32:03 2009
From: paulprobert at sbcglobal.net (Paul Probert)
Date: Sat, 23 May 2009 22:32:03 -0500
Subject: wxPython gurus, please help
In-Reply-To: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>
References: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>
Message-ID: <kmrme6-9l2.ln1@sbcglobal.net>

Jive Dadson wrote:
>    I have an application that opens an image file of the user's choice.
>   I have an exception handler for the case that the user selected a bad
> or unsupported image file.  My code is catching the exception, but
> unfortunately for me, after I exit the except-clause, wxPython is
> popping up its own message dialog from somewhere in deepest, darkest
> __core__.
> 
>    How do I make it not do that?
> 
>    Thankee much,
>    Jive
In your line creating your app object do it like this to avoid
redirecting error output to a popup window:

app=wx.App(False)



From phillip.sitbon at gmail.com  Sat May 23 23:50:44 2009
From: phillip.sitbon at gmail.com (Phillip Sitbon)
Date: Sat, 23 May 2009 20:50:44 -0700 (PDT)
Subject: [Announcement] PyISAPIe version 1.1.0 Release Candidate 2
Message-ID: <27535e47-8ee0-46b5-a31c-a90c14968b2a@d19g2000prh.googlegroups.com>

Hello all,

I've recently revived the Python ISAPI Extension (PyISAPIe) project
and thought I'd share the newest release with you, version 1.1.0-rc2.

Development in bringing Python to Windows servers has been slow these
days, so hopefully this project can continue to fill a niche for those
who need good performance and stable functionality.

http://pyisapie.sourceforge.net/

I know there's a good number of folks that have used it or are
currently using it, so any feedback is appreciated in order to make
1.1.0 come around faster.

Thanks for all your support so far!

Cheers,

Phillip


From nazia.zaman11 at gmail.com  Sun May 24 00:41:37 2009
From: nazia.zaman11 at gmail.com (nazia)
Date: Sat, 23 May 2009 21:41:37 -0700 (PDT)
Subject: Extending C++ class in python
Message-ID: <c48594af-5410-44db-b181-9b703546273b@c18g2000prh.googlegroups.com>

Hi all,
I'm a newbie in Python and need help. Can anyone help me by explaining
the steps of extending a C++ class in Python with a simple example?
I'm not interested to use SWIG like tools.
Thanks for your time.

-Nazia


From where at anywhere.com  Sun May 24 01:36:48 2009
From: where at anywhere.com (AK)
Date: Sun, 24 May 2009 01:36:48 -0400
Subject: Problems with sys.stout.flush()
In-Reply-To: <00346f94$0$9732$c3e8da3@news.astraweb.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>	<0033af48$0$9681$c3e8da3@news.astraweb.com>	<02282310$0$20616$c3e8da3@news.astraweb.com>
	<mailman.642.1243117397.8015.python-list@python.org>
	<00346f94$0$9732$c3e8da3@news.astraweb.com>
Message-ID: <4a18dcff$0$5404$607ed4bc@cv.net>

Joel Ross wrote:
> Rhodri James wrote:
>> On Sat, 23 May 2009 18:19:11 +0100, Joel Ross <joelc at cognyx.com> wrote:
>>
>>> Now I can move onto next one.
>>
>> Except that you still have the interesting issue that your environment
>> isn't responding to '\r' correctly, which worries me rather.  Or did
>> you never test that?
>>
> Yeah I gave the "\r" a go and it kept printing out on a new line I will 
> look into it.
> 
> Thanks for the heads up

What happens when you run this little program:

import time, sys

print "ONE",
sys.stdout.flush()
time.sleep(0.5)
print "\rTWO",
sys.stdout.flush()
time.sleep(0.5)


The idea is that it should print ONE, flush it, sleep .5 sec so 
that you can see 'ONE', then return to start of line, print TWO, 
flush it so you can read it, and sleep another 0.5 sec.

NOTE comma after print statement.

Does that work for you?

-ak


From mohammed.abosalim at gmail.com  Sun May 24 02:49:21 2009
From: mohammed.abosalim at gmail.com (abosalim)
Date: Sat, 23 May 2009 23:49:21 -0700 (PDT)
Subject: Need Help
Message-ID: <5f238e07-8d39-4bb4-8c6a-cbd56412fb5a@c36g2000yqn.googlegroups.com>


#Gui
import re, collections
from Tkinter import *
from nltk_lite import tokenize

def words(text): return re.findall('[a-z]+', text.lower())
def train(features):
    model = collections.defaultdict(lambda: 1)
    for f in features:
        model[f] += 1
        return model
NWORDS = train(words(file('big1.txt').read()))
alphabet = 'abcdefghijklmnopqrstuvwxyz'
def edits1(word):
    s = [(word[:i], word[i:]) for i in range(len(word) + 1)]
    deletes = [a + b[1:] for a, b in s if b]
    transposes = [a + b[1] + b[0] + b[2:] for a, b in s if len(b)>1]
    replaces = [a + c + b[1:] for a, b in s for c in alphabet if b]
    inserts = [a + c + b for a, b in s for c in alphabet]
    return set(deletes + transposes + replaces + inserts)
def known_edits2(word):
    return set(e2 for e1 in edits1(word) for e2 in edits1(e1) if e2 in
NWORDS)
def known(words):
    return set(w for w in words if w in NWORDS)
def correct(word):
    candidates = known([word]) or known(edits1(word)) or known_edits2
(word) or [word]
    return max(candidates, key=lambda w: NWORDS[w])
def textcorrect(str):
    s=[]
    for i in tokenize.whitespace(str):
        s.append(correct(i))
        result= " ".join(s)
        return result

################################GUI
Part#####################################
class Ex3:
    def __init__(self, master):
        self.frame = Frame(master)
        self.frame.pack()
        self.field = Entry(self.frame)
        self.field.pack(side=TOP)
        self.contents = StringVar()
        self.field.config(text=self.contents)
        self.stop = Button(self.frame, text="Exit", fg="red",
command=self.frame.quit)
        self.stop.pack(side=RIGHT)
        self.enter = Button(self.frame, text="Correct", fg="black",
command=self.new)
        self.enter.pack(side=LEFT)

    def new(self):
        self.string = self.contents.get()
#pass contents of textfield to words()method above
        self.res=  words(self.string)
        self.frame2 = Frame()
        self.frame2.pack()
        self.words = Label(self.frame2, text=self.res, fg="blue", font=
("Arial", 16))
        self.words.pack()
root = Tk()
Ex3 = Ex3(root)
root.mainloop()



It print text without correction.I think it didn't enter the method or
any method above the gui.
Please if you have any information,inform me

















From Ron.Barak at lsi.com  Sun May 24 02:52:29 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 24 May 2009 07:52:29 +0100
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <4A157AF1.9020104@mrabarnett.plus.com>
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A250B@enbmail01.lsi.com>

 

> -----Original Message-----
> From: MRAB [mailto:google at mrabarnett.plus.com] 
> Sent: Thursday, May 21, 2009 19:02
> To: 'python-list at python.org'
> Subject: Re: A fast way to read last line of gzip archive ?
> 
> Barak, Ron wrote:
> > Hi,
> >  
> > I need to read the end of a 20 MB gzip archives (To extract 
> the date 
> > from the last line of a a gzipped log file).
> > The solution I have below takes noticeable time to reach the end of 
> > the gzip archive.
> >  
> > Does anyone have a faster solution to read the last line of 
> a gzip archive ?
> >  
> > Thanks,
> > Ron.
> >  
> > #!/usr/bin/env python
> >  
> > import gzip
> >  
> > path = "./a/20/mb/file.tgz"
> >  
> > in_file = gzip.open(path, "r")
> > first_line = in_file.readline()
> > print "first_line ==",first_line
> > in_file.seek(-500)
> > last_line = in_file.readlines()[-1]
> > print "last_line ==",last_line
> > 
> It takes a noticeable time to reach the end because, well, 
> the data is compressed! The compression method used requires 
> the preceding data to be read first.

I thought maybe someone has a way to unzip just the end portion of the archive (instead of the whole archive), as only the last part is needed for reading the last line.

Bye,
Ron.


From ldo at geek-central.gen.new_zealand  Sun May 24 03:17:07 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 24 May 2009 19:17:07 +1200
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
Message-ID: <gvas9k$vvf$1@lust.ihug.co.nz>

In message <mailman.525.1242941777.8015.python-list at python.org>, Christian 
Heimes wrote:

> Welcome to IEEE 754 floating point land! :)

It used to be worse in the days before IEEE 754 became widespread. Anybody 
remember a certain Prof William Kahan from Berkeley, and the foreword he 
wrote to the Apple Numerics Manual, 2nd Edition, published in 1988? It's 
such a classic piece that I think it should be posted somewhere...



From mail at microcorp.co.za  Sun May 24 03:19:45 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 24 May 2009 09:19:45 +0200
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com><a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com><0227b2f0$0$25303$c3e8da3@news.astraweb.com><fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com><0033af48$0$9681$c3e8da3@news.astraweb.com><02282310$0$20616$c3e8da3@news.astraweb.com><mailman.642.1243117397.8015.python-list@python.org><00346f94$0$9732$c3e8da3@news.astraweb.com><gva85s$a9p$1@services.telesweet.net>
	<0228a4d8$0$19301$c3e8da3@news.astraweb.com>
Message-ID: <004e01c9dc40$0992c0c0$0d00a8c0@Hendrik>

"Joel Ross" <joelc at cognyx.com>
To: <python-list at python.org>
Sent: Sunday, May 24, 2009 4:32 AM
Subject: Re: Problems with sys.stout.flush()


> Mel wrote:
> > Joel Ross wrote:
> >> Rhodri James wrote:
> > [ ... ]
> >>> Except that you still have the interesting issue that your environment
> >>> isn't responding to '\r' correctly, which worries me rather.  Or did
> >>> you never test that?
> > 
> >> Yeah I gave the "\r" a go and it kept printing out on a new line I will
> >> look into it.
> > 
> > Are you running an Apple computer?
> > 
> > Mel.
> > 
> > 
> No running a Linux fedora 9 box
> 
Was the last character of your print command a comma?

- Hendrik
 




From charlietaylor at users.sourceforge.net  Sun May 24 04:39:20 2009
From: charlietaylor at users.sourceforge.net (Charlie)
Date: Sun, 24 May 2009 08:39:20 +0000 (UTC)
Subject: Optimizing math functions
References: <mailman.619.1243084999.8015.python-list@python.org>
	<0033dace$0$9725$c3e8da3@news.astraweb.com>
Message-ID: <loom.20090524T083337-764@post.gmane.org>

Steven D'Aprano <steve <at> REMOVE-THIS-cybersource.com.au> writes:

> 
> On Sat, 23 May 2009 09:22:59 -0400, Esmail wrote:
> 
> > Hello all,
> > 
> > I would like to maximize or minimize a given math function over a
> > specific set of values, in Python preferably.
> ...
> > What it apparently can't do is for maximize (or minimize) functions that
> > contain two variables, x and y, or more. 


You might also look at:
http://pyparasol.sourceforge.net/example_1.html





From descentspb at gmail.com  Sun May 24 04:45:33 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sun, 24 May 2009 12:45:33 +0400
Subject: How to reuse TCP listening socket immediately after it was connected
	at least once?
Message-ID: <4A19092D.1030305@gmail.com>

I have written a socket server and some arbitrary clients. When I 
shutdown the server, and do socket.close(), I cannot immediately start 
it again cause it has some open sockets in TIME_WAIT state. It throws 
address already in use exception at me. I have searched for that in 
google but haven't found a way to solve that.

Tried
setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
but that does not help.

Is there a nice way to overcome this?


From pierre.imbaud at gmail.com  Sun May 24 05:08:05 2009
From: pierre.imbaud at gmail.com (Imbaud Pierre)
Date: Sun, 24 May 2009 11:08:05 +0200
Subject: monitoring friendly applications
In-Reply-To: <t9dc15pbsvhr3hbhkb2461phkd32t196jr@4ax.com>
References: <4a13cebd$0$9377$426a74cc@news.free.fr>
	<t9dc15pbsvhr3hbhkb2461phkd32t196jr@4ax.com>
Message-ID: <4a190e75$0$20352$426a74cc@news.free.fr>

Thanks a lot. Your suggestions lead me to pypi, (I knew it but didnt 
remember the exact spelling, and no obvious link from www.python.org), 
and from there to supervisord, that answers pretty well my problem. 
Thanks again.

Tim Roberts wrote:
> Imbaud Pierre <pierre.imbaud at gmail.com> wrote:
>> I have A LOT of batch applications to monitor, on linux machines, mostly 
>> written in python.
>> I have to know:
>> - which are active, at a given moment?
>> - when did the last run occur? How long did it last?
>> - for some daemons: are they stuck? generally, waiting for i/o, or lost 
>> in some C call.
>> ...
>> By any chance, does something like this exist? Would someone be 
>> interested with this development?
> 
> http://www.letmegooglethatforyou.com?q=python+daemon+tools


From garabik-news-2005-05 at kassiopeia.juls.savba.sk  Sun May 24 06:37:16 2009
From: garabik-news-2005-05 at kassiopeia.juls.savba.sk (garabik-news-2005-05 at kassiopeia.juls.savba.sk)
Date: Sun, 24 May 2009 10:37:16 +0000 (UTC)
Subject: A fast way to read last line of gzip archive ?
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
Message-ID: <gvb80s$7rl$2@aioe.org>

Barak, Ron <Ron.Barak at lsi.com> wrote:
> 
> 
> 
> I thought maybe someone has a way to unzip just the end portion of the
> archive (instead of the whole archive), as only the last part is needed
> for reading the last line.

dictzip (python implementation part of my serpento package)
you have to compress the file with dictzip, instead of gzip, though
(but dictzipped file is just a special way of organizing the gzip file,
so it remains perfectly compatible with gunzip&comp.)


-- 
 -----------------------------------------------------------
| Radovan Garab?k http://kassiopeia.juls.savba.sk/~garabik/ |
| __..--^^^--..__    garabik @ kassiopeia.juls.savba.sk     |
 -----------------------------------------------------------
Antivirus alert: file .signature infected by signature virus.
Hi! I'm a signature virus! Copy me into your signature file to help me spread!


From willgun at live.cn  Sun May 24 06:42:13 2009
From: willgun at live.cn (=?gb2312?B?w8/svw==?=)
Date: Sun, 24 May 2009 18:42:13 +0800
Subject: help! Troubled when embed python into C++
Message-ID: <BAY106-DS78529887F87C21F9B4CDFAD540@phx.gbl>

I have the following codes in C++: 
#include <Python.h> 
void main(){ 
Py_Initialize(); 
PyRun_SimpleString("execfile(r'1.py')"); 
Py_Finalize(); 
return; 
} 

the following is in 1.py  : 
import Tkinter 
root=Tkinter.Tk() 
root2=Tkinter.Tk() 
root.mainloop() 
root2.mainloop() 

this is the output after I run the c++ program: 
Traceback (most recent call last): 
  File " <string>", line 1, in <module> 
  File "g:\volatile\1.py", line 2, in <module> 
    root=Tkinter.Tk() 
  File "C:\Python26\lib\lib-tk\Tkinter.py", line 1638, i 
    baseName = os.path.basename(sys.argv[0]) 
AttributeError: 'module' object has no attribute 'argv' 

I am quite new to python ,anyone know what shoud i do to solve it?
Thanks a lot!

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From joelc at cognyx.com  Sun May 24 06:43:56 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sun, 24 May 2009 20:43:56 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <4a18dcff$0$5404$607ed4bc@cv.net>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>	<0033af48$0$9681$c3e8da3@news.astraweb.com>	<02282310$0$20616$c3e8da3@news.astraweb.com>
	<mailman.642.1243117397.8015.python-list@python.org>
	<00346f94$0$9732$c3e8da3@news.astraweb.com>
	<4a18dcff$0$5404$607ed4bc@cv.net>
Message-ID: <0034ff8f$0$9695$c3e8da3@news.astraweb.com>

AK wrote:

> import time, sys
> 
> print "ONE",
> sys.stdout.flush()
> time.sleep(0.5)
> print "\rTWO",
> sys.stdout.flush()
> time.sleep(0.5)
>

Running the command above prints out
ONE
TWO

but running

for i in range(10):
     print "ONE",
     time.sleep(0.2)

prints out
ONE ONE ONE ONE ONE ONE ONE ONE ONE ONE

like Hendrik mentioned adding comma to the end prints out on one line. 
But my problem problem wasn't printing on one line it was mathematical 
each time I printed on one line it was appending the print before. Which 
is all the above command does anyway. I had to apply some maths to solve 
the issue I was having which was printing out a progress bar. I Got it 
working though.

jross


From ldo at geek-central.gen.new_zealand  Sun May 24 06:45:11 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 24 May 2009 22:45:11 +1200
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
Message-ID: <gvb8fn$7gm$1@lust.ihug.co.nz>

In message <mailman.651.1243154739.8015.python-list at python.org>, Igor Katson 
wrote:

> I have written a socket server and some arbitrary clients. When I
> shutdown the server, and do socket.close(), I cannot immediately start
> it again cause it has some open sockets in TIME_WAIT state. It throws
> address already in use exception at me.

There's a reason for that. It's to ensure that there are no leftover packets 
floating around the Internet somewhere, that you might mistakenly receive 
and think they were part of a new connection, when they were in fact part of 
an old one.

The right thing to do is try to ensure that all your connections are 
properly closed at shutdown. That may not be enough (if your server crashes 
due to bugs), so the other thing you need to do is retry the socket open, 
say, at 30-second intervals, until it succeeds.



From descentspb at gmail.com  Sun May 24 06:46:24 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sun, 24 May 2009 14:46:24 +0400
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
In-Reply-To: <4A19092D.1030305@gmail.com>
References: <4A19092D.1030305@gmail.com>
Message-ID: <4A192580.5090308@gmail.com>

Igor Katson wrote:
> I have written a socket server and some arbitrary clients. When I 
> shutdown the server, and do socket.close(), I cannot immediately start 
> it again cause it has some open sockets in TIME_WAIT state. It throws 
> address already in use exception at me. I have searched for that in 
> google but haven't found a way to solve that.
>
> Tried
> setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
> but that does not help.
>
> Is there a nice way to overcome this?
Solved myself. SO_REUSEADDE should be used on the second listening 
socket creation (while time_wait already hangs)


From ldo at geek-central.gen.new_zealand  Sun May 24 06:47:51 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 24 May 2009 22:47:51 +1200
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
Message-ID: <gvb8kn$7gm$2@lust.ihug.co.nz>

In message <7b986ef0-d118-4e0c-
afef-3c6385a4c6e6 at b7g2000pre.googlegroups.com>, rustom wrote:

> For a mathematician there are no inexact numbers; for a physicist no
> exact ones.

On the contrary, mathematics have worked out a precise theory of 
inexactness.

As for exactitude in physics, Gregory Chaitin among others has been trying 
to rework physics to get rid of real numbers altogether.



From vad.viktor at gmail.com  Sun May 24 06:54:19 2009
From: vad.viktor at gmail.com (Ikon)
Date: Sun, 24 May 2009 03:54:19 -0700 (PDT)
Subject: How does Python's OOP feel?
Message-ID: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>

I'm rather new to Python. I have PHP for my main language and I do
some Java. They all have a very strict OO schema. As I red through
Python's tutorial it seams it has nothing of those rules. No statical,
abstract classes, functions, or variables.

I wish someone, who has experience in both Java/PHP/C# and Python
would tell me how mush better/worse is it to program in a language
that misses most of the OO parts!


From gdamjan at gmail.com  Sun May 24 07:02:45 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Sun, 24 May 2009 13:02:45 +0200
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
Message-ID: <l3mne6-shd.ln1@archaeopteryx.softver.org.mk>



> I have written a socket server and some arbitrary clients. When I
> shutdown the server, and do socket.close(), I cannot immediately start
> it again cause it has some open sockets in TIME_WAIT state. It throws
> address already in use exception at me. I have searched for that in
> google but haven't found a way to solve that.
> 
> Tried
> setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
> but that does not help.

This should work, AFAIK you only need to do it before you call .bind(..) 
on the accept-ing socket



-- 
?????? ( http://softver.org.mk/damjan/ )

Give me the knowledge to change the code I do not accept, 
the wisdom not to accept the code I cannot change, 
and the freedom to choose my preference.



From andrea.gavana at gmail.com  Sun May 24 07:28:05 2009
From: andrea.gavana at gmail.com (Infinity77)
Date: Sun, 24 May 2009 04:28:05 -0700 (PDT)
Subject: Multiprocessing and file I/O
Message-ID: <ab7dd7b6-40dd-46a7-8bda-d30d9bfbb7df@m17g2000vbi.googlegroups.com>

Hi All,

    I am trying to speed up some code which reads a bunch of data from
a disk file. Just for the fun of it, I thought to try and use parallel
I/O to split the reading of the file between multiple processes.
Although I have been warned that concurrent access by multiple
processes to the same file may actually slow down the reading of the
file, I was curious to try some timings by varying the number of
processes which read the file. I know almost nothing of
multiprocessing, so I was wondering if anyone had some very simple
snippet of code which demonstrates how to read a file using
multiprocessing.

My idea was to create a "big" file by doing:

fid = open("somefile.txt", "wb")
fid.write("HELLO\n"*1e7)
fid.close()

and then using fid.seek() to point every process I start to a position
inside the file and start reading from there. For example, with 4
processes and a 10 MB file, I would tell the first process to read
from byte 0 to byte 2.5 million, the second one from 2.5 million to 5
million and so on. I just have an academic curiosity :-D

Any suggestion is very welcome, either to the approach or to the
actual implementation. Thank you for your help.

Andrea.


From a.cavallo at mailsnare.com  Sun May 24 08:05:30 2009
From: a.cavallo at mailsnare.com (A. Cavallo)
Date: Sun, 24 May 2009 13:05:30 +0100
Subject: help! Troubled when embed python into C++
In-Reply-To: <BAY106-DS78529887F87C21F9B4CDFAD540@phx.gbl>
References: <BAY106-DS78529887F87C21F9B4CDFAD540@phx.gbl>
Message-ID: <200905241305.30321.a.cavallo@mailsnare.com>

You need the:

int main(int argc, char * argv[])
{
    Py_Initialize();
    PySys_SetArgv(argc, argv);
    PyRun_SimpleString("execfile(r'1.py')");
    Py_Finalize();
    return 0;
}


Regards,
Antonio

On Sunday 24 May 2009 11:42:13 ?? wrote:
> I have the following codes in C++:
> #include <Python.h>
> void main(){
> Py_Initialize();
> PyRun_SimpleString("execfile(r'1.py')");
> Py_Finalize();
> return;
> }
>
> the following is in 1.py  :
> import Tkinter
> root=Tkinter.Tk()
> root2=Tkinter.Tk()
> root.mainloop()
> root2.mainloop()
>
> this is the output after I run the c++ program:
> Traceback (most recent call last):
>   File " <string>", line 1, in <module>
>   File "g:\volatile\1.py", line 2, in <module>
>     root=Tkinter.Tk()
>   File "C:\Python26\lib\lib-tk\Tkinter.py", line 1638, i
>     baseName = os.path.basename(sys.argv[0])
> AttributeError: 'module' object has no attribute 'argv'
>
> I am quite new to python ,anyone know what shoud i do to solve it?
> Thanks a lot!



From jonas.esp at googlemail.com  Sun May 24 08:06:13 2009
From: jonas.esp at googlemail.com (Kless)
Date: Sun, 24 May 2009 05:06:13 -0700 (PDT)
Subject: Set a variable as in setter
Message-ID: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>

Is there any way to simplify the next code? Because I'm setting a
variable by default of the same way than it's set in the setter.

-------------------
class Foo(object):
   def __init__(self, bar):
      self._bar = self._change(bar)  # !!! as setter

   @property
   def bar(self):
      return self._bar

   @bar.setter
   def bar(self, bar):
      self._bar = self._change(bar)  # !!! as in init

   def _change(self, text):
      return text + 'any change'
-------------------


From descentspb at gmail.com  Sun May 24 08:10:05 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sun, 24 May 2009 16:10:05 +0400
Subject: Multiprocessing and file I/O
In-Reply-To: <ab7dd7b6-40dd-46a7-8bda-d30d9bfbb7df@m17g2000vbi.googlegroups.com>
References: <ab7dd7b6-40dd-46a7-8bda-d30d9bfbb7df@m17g2000vbi.googlegroups.com>
Message-ID: <4A19391D.9090304@gmail.com>

Infinity77 wrote:
> Hi All,
>
>     I am trying to speed up some code which reads a bunch of data from
> a disk file. Just for the fun of it, I thought to try and use parallel
> I/O to split the reading of the file between multiple processes.
> Although I have been warned that concurrent access by multiple
> processes to the same file may actually slow down the reading of the
> file, I was curious to try some timings by varying the number of
> processes which read the file. I know almost nothing of
> multiprocessing, so I was wondering if anyone had some very simple
> snippet of code which demonstrates how to read a file using
> multiprocessing.
>
> My idea was to create a "big" file by doing:
>
> fid = open("somefile.txt", "wb")
> fid.write("HELLO\n"*1e7)
> fid.close()
>
> and then using fid.seek() to point every process I start to a position
> inside the file and start reading from there. For example, with 4
> processes and a 10 MB file, I would tell the first process to read
> from byte 0 to byte 2.5 million, the second one from 2.5 million to 5
> million and so on. I just have an academic curiosity :-D
>
> Any suggestion is very welcome, either to the approach or to the
> actual implementation. Thank you for your help.
>
> Andrea.
>   
If the thing you would want to speed up is the processing of the file 
(and not the IO), I would make one process actually read the file, and 
feed the other processes with the data from the file through a queue.


From a.cavallo at mailsnare.com  Sun May 24 08:14:30 2009
From: a.cavallo at mailsnare.com (A. Cavallo)
Date: Sun, 24 May 2009 13:14:30 +0100
Subject: Replacing module with a stub for unit testing
In-Reply-To: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>
References: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>
Message-ID: <200905241314.30576.a.cavallo@mailsnare.com>

how about the old and simple:

import ExpensiveModuleStub as ExpensiveModule

On a different league you could make use of decorator and creating caching
objects but that depends entirely on the requirements (how strict your test 
must be, test data sizes involved and more, much more details).

Regards,
Antonio



On Saturday 23 May 2009 14:00:15 pigmartian at gmail.com wrote:
> Hi,
>
> I'm working on a unit test framework for a module.  The module I'm
> testing indirectly calls another module which is expensive to access
> --- CDLLs whose functions access a database.
>
>     test_MyModule --->MyModule--->IntermediateModule---
>
> >ExpensiveModule
>
> I want to create a stub of ExpensiveModule and have that be accessed
> by IntermediateModule instead of the real version
>
>     test_MyModule --->MyModule--->IntermediateModule---
>
> >ExpensiveModuleStub
>
> I tried the following in my unittest:
>
>     import ExpensiveModuleStub
>     sys.modules['ExpensiveModule'] = ExpensiveModuleStub # Doesn't
> work
>
> But, import statements in the IntermediateModule still access the real
> ExpensiveModule, not the stub.
>
> The examples I can find of creating and using Mock or Stub objects
> seem to all follow a pattern where the fake objects are passed in as
> arguments to the code being tested.  For example, see the "Example
> Usage" section here: http://python-mock.sourceforge.net.  But that
> doesn't work in my case as the module I'm testing doesn't directly use
> the module that I want to replace.
>
> Can anybody suggest something?
>
> Thanks,
>
> Scott



From duncan.booth at invalid.invalid  Sun May 24 08:27:13 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 24 May 2009 12:27:13 GMT
Subject: Set a variable as in setter
References: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>
Message-ID: <Xns9C1588DDA9E0Eduncanbooth@127.0.0.1>

Kless <jonas.esp at googlemail.com> wrote:

> Is there any way to simplify the next code? Because I'm setting a
> variable by default of the same way than it's set in the setter.
> 
> -------------------
> class Foo(object):
>    def __init__(self, bar):
>       self._bar = self._change(bar)  # !!! as setter

What's wrong with just doing this?:
        self.bar = bar

> 
>    @property
>    def bar(self):
>       return self._bar
> 
>    @bar.setter
>    def bar(self, bar):
>       self._bar = self._change(bar)  # !!! as in init
> 
>    def _change(self, text):
>       return text + 'any change'
> -------------------
> 



From ebonak at hotmail.com  Sun May 24 08:30:13 2009
From: ebonak at hotmail.com (Esmail)
Date: Sun, 24 May 2009 08:30:13 -0400
Subject: Optimizing math functions
In-Reply-To: <loom.20090524T083337-764@post.gmane.org>
References: <mailman.619.1243084999.8015.python-list@python.org>	<0033dace$0$9725$c3e8da3@news.astraweb.com>
	<loom.20090524T083337-764@post.gmane.org>
Message-ID: <4A193DD5.4090401@hotmail.com>

Charlie wrote:
> 
> You might also look at:
> http://pyparasol.sourceforge.net/example_1.html

Thanks for this lead, I had never heard of parasol before. Do you know
if this also works under Linux? The docs mention only the Windows platform,
but given that this is Python perhaps it is save to assume this would also
work under Linux?

Esmail



From ebonak at hotmail.com  Sun May 24 08:42:59 2009
From: ebonak at hotmail.com (Esmail)
Date: Sun, 24 May 2009 08:42:59 -0400
Subject: Optimizing math functions
In-Reply-To: <gv9pda$t3s$1@ger.gmane.org>
References: <gv8tbl$ph3$1@ger.gmane.org> <gv9pda$t3s$1@ger.gmane.org>
Message-ID: <4A1940D3.3000404@hotmail.com>

Robert Kern wrote:
> 
> 
> We have several bounded optimization routines in scipy.
> 
> http://docs.scipy.org/doc/scipy/reference/optimize.html

Hi Robert,

Thanks for the lead .. I briefly looked at the documentation, but
before I dig into this more deeply 2 quick questions:

1. Will is also allow me to maximize a function (I only saw minimum)?

2. Will it give me the global minima/maxima?

I only ask because I got all excited to see that R has an optimize
function but unfortunately it can not deal with multi-modal functions.
I am trying  to come up with some complex test cases for a genetic
algorithm I'm working with, both for functions using f(x) and f(x,y) over a
variety of intervals so I  would like to have a way to verify results for
more challenging functions.

Thanks a lot,

Esmail



From stef.mientki at gmail.com  Sun May 24 09:01:51 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 24 May 2009 15:01:51 +0200
Subject: how to get rid of pyc files ?
Message-ID: <4A19453F.5050204@gmail.com>

hello,

Moving my entire program section between windows and Ubuntu,
sometimes causes problems, due to the existence of pyc-files
(and probably because my program still has hard coded paths).

Now I want get rid of the pyc-files,
so I wrote a py-script to remoce all pyc-files,
but because it's run from the same program section,
a few pyc files are recreated.

Is there a way to prevent generating pyc-files ?
Or is there a way to redirect the generated pyc-files to a dedicated 
location ?

btw, What commandline switches are available for python ?
(googling didn't give me any relevant hits )

thanks,
Stef Mientki


From mk.fraggod at gmail.com  Sun May 24 09:03:26 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sun, 24 May 2009 19:03:26 +0600
Subject: Set a variable as in setter
In-Reply-To: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>
References: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>
Message-ID: <20090524190326.1b5363cd@coercion>

On Sun, 24 May 2009 05:06:13 -0700 (PDT)
Kless <jonas.esp at googlemail.com> wrote:

> Is there any way to simplify the next code? Because I'm setting a
> variable by default of the same way than it's set in the setter.
> 
> -------------------
> class Foo(object):
>    def __init__(self, bar):
>       self._bar = self._change(bar)  # !!! as setter

Guess it's obvious, but why not use "setattr(self, 'bar', bar)" here, in
__init__ - it'll just call defined setter.

>    @property
>    def bar(self):
>       return self._bar
> 
>    @bar.setter
>    def bar(self, bar):
>       self._bar = self._change(bar)  # !!! as in init
> 
>    def _change(self, text):
>       return text + 'any change'
> -------------------

-- 
Mike Kazantsev // fraggod.net
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From mk.fraggod at gmail.com  Sun May 24 09:07:27 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sun, 24 May 2009 19:07:27 +0600
Subject: how to get rid of pyc files ?
In-Reply-To: <4A19453F.5050204@gmail.com>
References: <4A19453F.5050204@gmail.com>
Message-ID: <20090524190727.4dee20fa@coercion>

On Sun, 24 May 2009 15:01:51 +0200
Stef Mientki <stef.mientki at gmail.com> wrote:

> Moving my entire program section between windows and Ubuntu,
> sometimes causes problems, due to the existence of pyc-files
> (and probably because my program still has hard coded paths).
> 
> Now I want get rid of the pyc-files,
> so I wrote a py-script to remoce all pyc-files,
> but because it's run from the same program section,
> a few pyc files are recreated.
> 
> Is there a way to prevent generating pyc-files ?
> Or is there a way to redirect the generated pyc-files to a dedicated 
> location ?

Use a "-B" command-line option or "PYTHONDONTWRITEBYTECODE=x" env var.
You can put either "alias python='python -B'" or
"export PYTHONDONTWRITEBYTECODE=x" to your .bashrc/profile and forget
about .pyc/pyo forever.

> btw, What commandline switches are available for python ?
> (googling didn't give me any relevant hits )

You might be amazed how much insight "man python" and "python -h" can
yield ;)

-- 
Mike Kazantsev // fraggod.net
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From mk.fraggod at gmail.com  Sun May 24 09:14:54 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sun, 24 May 2009 19:14:54 +0600
Subject: Set a variable as in setter
In-Reply-To: <20090524190326.1b5363cd@coercion>
References: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>
	<20090524190326.1b5363cd@coercion>
Message-ID: <20090524191454.6684b66d@coercion>

On Sun, 24 May 2009 19:03:26 +0600
Mike Kazantsev <mk.fraggod at gmail.com> wrote:

> On Sun, 24 May 2009 05:06:13 -0700 (PDT)
> Kless <jonas.esp at googlemail.com> wrote:
> 
> > Is there any way to simplify the next code? Because I'm setting a
> > variable by default of the same way than it's set in the setter.
> > 
> > -------------------
> > class Foo(object):
> >    def __init__(self, bar):
> >       self._bar = self._change(bar)  # !!! as setter
> 
> Guess it's obvious, but why not use "setattr(self, 'bar', bar)" here, in
> __init__ - it'll just call defined setter.

In fact, "self.bar = bar" is even simplier.
Somehow I thought it wouldn't work here, but it does.

> >    @property
> >    def bar(self):
> >       return self._bar
> > 
> >    @bar.setter
> >    def bar(self, bar):
> >       self._bar = self._change(bar)  # !!! as in init
> > 
> >    def _change(self, text):
> >       return text + 'any change'
> > -------------------
> 


-- 
Mike Kazantsev // fraggod.net
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From ebonak at hotmail.com  Sun May 24 09:15:07 2009
From: ebonak at hotmail.com (Esmail)
Date: Sun, 24 May 2009 09:15:07 -0400
Subject: how to get rid of pyc files ?
In-Reply-To: <4A19453F.5050204@gmail.com>
References: <4A19453F.5050204@gmail.com>
Message-ID: <4A19485B.1050204@hotmail.com>

Stef Mientki wrote:
> 
> btw, What commandline switches are available for python ?
> (googling didn't give me any relevant hits )

Hi Stef,

This is what I get w/ v2.6 under Ubuntu 9.04


9:12 esmail at t61 ~/Python  [510] python -h
usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ...
Options and arguments (and corresponding environment variables):
-B     : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x
-c cmd : program passed in as string (terminates option list)
-d     : debug output from parser; also PYTHONDEBUG=x
-E     : ignore PYTHON* environment variables (such as PYTHONPATH)
-h     : print this help message and exit (also --help)
-i     : inspect interactively after running script; forces a prompt even
          if stdin does not appear to be a terminal; also PYTHONINSPECT=x
-m mod : run library module as a script (terminates option list)
-O     : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x
-OO    : remove doc-strings in addition to the -O optimizations
-Q arg : division options: -Qold (default), -Qwarn, -Qwarnall, -Qnew
-s     : don't add user site directory to sys.path; also PYTHONNOUSERSITE
-S     : don't imply 'import site' on initialization
-t     : issue warnings about inconsistent tab usage (-tt: issue errors)
-u     : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x
          see man page for details on internal buffering relating to '-u'
-v     : verbose (trace import statements); also PYTHONVERBOSE=x
          can be supplied multiple times to increase verbosity
-V     : print the Python version number and exit (also --version)
-W arg : warning control; arg is action:message:category:module:lineno
-x     : skip first line of source, allowing use of non-Unix forms of #!cmd
-3     : warn about Python 3.x incompatibilities that 2to3 cannot trivially fix
file   : program read from script file
-      : program read from stdin (default; interactive mode if a tty)
arg ...: arguments passed to program in sys.argv[1:]

Other environment variables:
PYTHONSTARTUP: file executed on interactive startup (no default)
PYTHONPATH   : ':'-separated list of directories prefixed to the
                default module search path.  The result is sys.path.
PYTHONHOME   : alternate <prefix> directory (or <prefix>:<exec_prefix>).
                The default module search path uses <prefix>/pythonX.X.
PYTHONCASEOK : ignore case in 'import' statements (Windows).
PYTHONIOENCODING: Encoding[:errors] used for stdin/stdout/stderr.

XP looks similar enough (I didn't look through it for any differences):

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\> python -h
usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ...
Options and arguments (and corresponding environment variables):
-B     : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x
-c cmd : program passed in as string (terminates option list)
-d     : debug output from parser; also PYTHONDEBUG=x
-E     : ignore PYTHON* environment variables (such as PYTHONPATH)
-h     : print this help message and exit (also --help)
-i     : inspect interactively after running script; forces a prompt even
          if stdin does not appear to be a terminal; also PYTHONINSPECT=x
-m mod : run library module as a script (terminates option list)
-O     : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x
-OO    : remove doc-strings in addition to the -O optimizations
-Q arg : division options: -Qold (default), -Qwarn, -Qwarnall, -Qnew
-s     : don't add user site directory to sys.path; also PYTHONNOUSERSITE
-S     : don't imply 'import site' on initialization
-t     : issue warnings about inconsistent tab usage (-tt: issue errors)
-u     : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x
          see man page for details on internal buffering relating to '-u'
-v     : verbose (trace import statements); also PYTHONVERBOSE=x
          can be supplied multiple times to increase verbosity
-V     : print the Python version number and exit (also --version)
-W arg : warning control; arg is action:message:category:module:lineno
-x     : skip first line of source, allowing use of non-Unix forms of #!cmd
-3     : warn about Python 3.x incompatibilities
file   : program read from script file
-      : program read from stdin (default; interactive mode if a tty)
arg ...: arguments passed to program in sys.argv[1:]

Other environment variables:
PYTHONSTARTUP: file executed on interactive startup (no default)
PYTHONPATH   : ';'-separated list of directories prefixed to the
                default module search path.  The result is sys.path.
PYTHONHOME   : alternate <prefix> directory (or <prefix>;<exec_prefix>).
                The default module search path uses <prefix>\lib.
PYTHONCASEOK : ignore case in 'import' statements (Windows).
PYTHONIOENCODING: Encoding[:errors] used for stdin/stdout/stderr.


HTH,

Esmail



From roy at panix.com  Sun May 24 09:21:48 2009
From: roy at panix.com (Roy Smith)
Date: Sun, 24 May 2009 09:21:48 -0400
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
Message-ID: <roy-3C4DED.09214724052009@news.panix.com>

In article <gvb8fn$7gm$1 at lust.ihug.co.nz>,
 Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:

> In message <mailman.651.1243154739.8015.python-list at python.org>, Igor Katson 
> wrote:
> 
> > I have written a socket server and some arbitrary clients. When I
> > shutdown the server, and do socket.close(), I cannot immediately start
> > it again cause it has some open sockets in TIME_WAIT state. It throws
> > address already in use exception at me.
> 
> There's a reason for that. It's to ensure that there are no leftover packets 
> floating around the Internet somewhere, that you might mistakenly receive 
> and think they were part of a new connection, when they were in fact part of 
> an old one.

In theory, that is indeed the reason for the TIME_WAIT state.  In practice, 
however, using SO_REUSEADDR is pretty safe, and common practice.

You've got several things working in your favor.  First, late-delivery of 
packets is pretty rare.  Second, if some late packet were to arrive, the 
chances of them having the same local and remote port numbers as an 
existing connection is slim.  And, finally, the TCP sequence number won't 
line up.

One thing to be aware of is that SO_REUSEADDR isn't 100% portable.  There 
are some systems (ISTR HP-UX) which use SO_REUSEPORT instead of 
SO_REUSEADDR.  The original specifications weren't very clear, and some 
implementers read them in strange ways.  Some of that old code continues in 
use today.  I only mention this because if you try SO_REUSEADDR and it's 
not doing what you expect, it's worth trying SO_REUSEPORT (or both) to see 
what happens on your particular system.

> The right thing to do is try to ensure that all your connections are 
> properly closed at shutdown. That may not be enough (if your server crashes 
> due to bugs), so the other thing you need to do is retry the socket open, 
> say, at 30-second intervals, until it succeeds.

That may be a reasonable thing to do for production code, but when you're 
building and debugging a server, it's a real pain to not be able to restart 
it quickly whenever you want (or need) to.


From steve at REMOVE-THIS-cybersource.com.au  Sun May 24 09:30:05 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 24 May 2009 13:30:05 GMT
Subject: Replacing module with a stub for unit testing
References: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>
	<mailman.655.1243167260.8015.python-list@python.org>
Message-ID: <02293ea4$0$21844$c3e8da3@news.astraweb.com>

On Sun, 24 May 2009 13:14:30 +0100, A. Cavallo wrote:

> how about the old and simple:
> 
> import ExpensiveModuleStub as ExpensiveModule

No, that won't do, because for it to have the desired effort, it needs to 
be inside the IntermediateModule, not the Test_Module. That means that 
IntermediateModule needs to know if it is running in "test mode" or "real 
mode", and that's (1) possibly impractical, and (2) not great design.



-- 
Steven


From sjmachin at lexicon.net  Sun May 24 09:52:10 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 24 May 2009 06:52:10 -0700 (PDT)
Subject: Optimizing math functions
References: <gv8tbl$ph3$1@ger.gmane.org> <gv9pda$t3s$1@ger.gmane.org> 
	<mailman.657.1243168995.8015.python-list@python.org>
Message-ID: <1a945081-ccff-4119-a97f-f313313ca279@i28g2000prd.googlegroups.com>

On May 24, 10:42?pm, Esmail <ebo... at hotmail.com> wrote:
> Robert Kern wrote:
>
> > We have several bounded optimization routines in scipy.
>
> >http://docs.scipy.org/doc/scipy/reference/optimize.html
>
> Hi Robert,
>
> Thanks for the lead .. I briefly looked at the documentation, but
> before I dig into this more deeply 2 quick questions:
>
> 1. Will is also allow me to maximize a function (I only saw minimum)?

To maximise f(x,y), minimise -f(x,y)

HTH,
John


From sjmachin at lexicon.net  Sun May 24 09:58:06 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 24 May 2009 06:58:06 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org>
Message-ID: <f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com>

On May 24, 11:01?pm, Stef Mientki <stef.mien... at gmail.com> wrote:
> hello,
>
> Moving my entire program section between windows and Ubuntu,
> sometimes causes problems, due to the existence of pyc-files

What problems? Like avoiding having to recompile your .py files makes
your app run too fast?

> (and probably because my program still has hard coded paths).
>
> Now I want get rid of the pyc-files,

Which does nothing for the hard-coded paths issue ...


From ebonak at hotmail.com  Sun May 24 10:11:36 2009
From: ebonak at hotmail.com (Esmail)
Date: Sun, 24 May 2009 10:11:36 -0400
Subject: Optimizing math functions
In-Reply-To: <1a945081-ccff-4119-a97f-f313313ca279@i28g2000prd.googlegroups.com>
References: <gv8tbl$ph3$1@ger.gmane.org> <gv9pda$t3s$1@ger.gmane.org>
	<mailman.657.1243168995.8015.python-list@python.org>
	<1a945081-ccff-4119-a97f-f313313ca279@i28g2000prd.googlegroups.com>
Message-ID: <4A195598.2090805@hotmail.com>

John Machin wrote:
> 
>>
>> 1. Will is also allow me to maximize a function (I only saw minimum)?
> 
> To maximise f(x,y), minimise -f(x,y)

Ooops .. yes of course!

Thanks,
Esmail



From andrea.gavana at gmail.com  Sun May 24 10:13:52 2009
From: andrea.gavana at gmail.com (Infinity77)
Date: Sun, 24 May 2009 07:13:52 -0700 (PDT)
Subject: Multiprocessing and file I/O
References: <ab7dd7b6-40dd-46a7-8bda-d30d9bfbb7df@m17g2000vbi.googlegroups.com>
	<mailman.654.1243167010.8015.python-list@python.org>
Message-ID: <8e21bc22-ad0e-4c18-85e2-df6e84d1afc3@n8g2000vbb.googlegroups.com>

Hi Igor,

On May 24, 1:10?pm, Igor Katson <descent... at gmail.com> wrote:
> Infinity77 wrote:
> > Hi All,
>
> > ? ? I am trying to speed up some code which reads a bunch of data from
> > a disk file. Just for the fun of it, I thought to try and use parallel
> > I/O to split the reading of the file between multiple processes.
> > Although I have been warned that concurrent access by multiple
> > processes to the same file may actually slow down the reading of the
> > file, I was curious to try some timings by varying the number of
> > processes which read the file. I know almost nothing of
> > multiprocessing, so I was wondering if anyone had some very simple
> > snippet of code which demonstrates how to read a file using
> > multiprocessing.
>
> > My idea was to create a "big" file by doing:
>
> > fid = open("somefile.txt", "wb")
> > fid.write("HELLO\n"*1e7)
> > fid.close()
>
> > and then using fid.seek() to point every process I start to a position
> > inside the file and start reading from there. For example, with 4
> > processes and a 10 MB file, I would tell the first process to read
> > from byte 0 to byte 2.5 million, the second one from 2.5 million to 5
> > million and so on. I just have an academic curiosity :-D
>
> > Any suggestion is very welcome, either to the approach or to the
> > actual implementation. Thank you for your help.
>
> > Andrea.
>
> If the thing you would want to speed up is the processing of the file
> (and not the IO), I would make one process actually read the file, and
> feed the other processes with the data from the file through a queue.

No, the processing of the data is fast enough, as it is very simple.
What I was asking is if anyone could share an example of using
multiprocessing to read a file, along the lines I described above.

Andrea.


From descentspb at gmail.com  Sun May 24 10:44:49 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sun, 24 May 2009 18:44:49 +0400
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
In-Reply-To: <roy-3C4DED.09214724052009@news.panix.com>
References: <mailman.651.1243154739.8015.python-list@python.org>	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
Message-ID: <4A195D61.1000600@gmail.com>

Roy Smith wrote:
> In article <gvb8fn$7gm$1 at lust.ihug.co.nz>,
>  Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
>
>   
>> In message <mailman.651.1243154739.8015.python-list at python.org>, Igor Katson 
>> wrote:
>>
>>     
>>> I have written a socket server and some arbitrary clients. When I
>>> shutdown the server, and do socket.close(), I cannot immediately start
>>> it again cause it has some open sockets in TIME_WAIT state. It throws
>>> address already in use exception at me.
>>>       
>> There's a reason for that. It's to ensure that there are no leftover packets 
>> floating around the Internet somewhere, that you might mistakenly receive 
>> and think they were part of a new connection, when they were in fact part of 
>> an old one.
>>     
>
> In theory, that is indeed the reason for the TIME_WAIT state.  In practice, 
> however, using SO_REUSEADDR is pretty safe, and common practice.
>
> You've got several things working in your favor.  First, late-delivery of 
> packets is pretty rare.  Second, if some late packet were to arrive, the 
> chances of them having the same local and remote port numbers as an 
> existing connection is slim.  And, finally, the TCP sequence number won't 
> line up.
>
> One thing to be aware of is that SO_REUSEADDR isn't 100% portable.  There 
> are some systems (ISTR HP-UX) which use SO_REUSEPORT instead of 
> SO_REUSEADDR.  The original specifications weren't very clear, and some 
> implementers read them in strange ways.  Some of that old code continues in 
> use today.  I only mention this because if you try SO_REUSEADDR and it's 
> not doing what you expect, it's worth trying SO_REUSEPORT (or both) to see 
> what happens on your particular system.
>
>   
>> The right thing to do is try to ensure that all your connections are 
>> properly closed at shutdown. That may not be enough (if your server crashes 
>> due to bugs), so the other thing you need to do is retry the socket open, 
>> say, at 30-second intervals, until it succeeds.
>>     
>
> That may be a reasonable thing to do for production code, but when you're 
> building and debugging a server, it's a real pain to not be able to restart 
> it quickly whenever you want (or need) to.
>   
Thanks for a great answer, Roy!


From Ron.Barak at lsi.com  Sun May 24 10:57:05 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 24 May 2009 15:57:05 +0100
Subject: wxpython and zoom/pan image
In-Reply-To: <e5092503-1254-4dd5-a36f-83844b9d11f0@d19g2000prh.googlegroups.com>
References: <e5092503-1254-4dd5-a36f-83844b9d11f0@d19g2000prh.googlegroups.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A251A@enbmail01.lsi.com>

 Hi Ross,
You probably would get more focused answers if you addressed the question to the wxPython list at wxpython-users at lists.wxwidgets.org
As for your question, seeing your (simplified) code might help: out of hand, what you want to do is catch the events you're interested in (e.g., double-left-click) and create functions/class-instances that would perform the needed actions.
I'd suggest reading "wxPython in Action" (ISBN 1-932394-62-1) as it would give you most of the answers you seek.
Bye,
Ron. 

> -----Original Message-----
> From: rzzzwilson at gmail.com [mailto:rzzzwilson at gmail.com] 
> Sent: Sunday, May 24, 2009 03:28
> To: python-list at python.org
> Subject: wxpython and zoom/pan image
> 
> Hi,
> 
> I've googled for this, but can only find things like 
> openlayers that is a web-based javascript solution.
> 
> I need to display an image at various zoom levels and want to 
> allow the user to pan around in the Google maps style, that 
> is, left-click hold and drag.  The code should also action 
> double-clicks on the image (but that's easy).
> 
> There are no 'standard' wxpython widgets that allow this.  
> Can anyone point me to information on how to implement such a 
> thing, or maybe some working code?
> 
> Thanks,
> Ross
> 
> 

From deets at nospam.web.de  Sun May 24 11:03:35 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 24 May 2009 17:03:35 +0200
Subject: Extending C++ class in python
In-Reply-To: <c48594af-5410-44db-b181-9b703546273b@c18g2000prh.googlegroups.com>
References: <c48594af-5410-44db-b181-9b703546273b@c18g2000prh.googlegroups.com>
Message-ID: <77t5u8F1i99bqU1@mid.uni-berlin.de>

nazia schrieb:
> Hi all,
> I'm a newbie in Python and need help. Can anyone help me by explaining
> the steps of extending a C++ class in Python with a simple example?
> I'm not interested to use SWIG like tools.
> Thanks for your time.

If your are not interested in using the tools provided for this task, I 
fear you won't get much help. I'd personally use SIP and can only 
recommend it.

Diez


From Ron.Barak at lsi.com  Sun May 24 11:05:36 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 24 May 2009 16:05:36 +0100
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <gvb80s$7rl$2@aioe.org>
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
	<gvb80s$7rl$2@aioe.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A251B@enbmail01.lsi.com>

 

> -----Original Message-----
> From: garabik-news-2005-05 at kassiopeia.juls.savba.sk 
> [mailto:garabik-news-2005-05 at kassiopeia.juls.savba.sk] 
> Sent: Sunday, May 24, 2009 13:37
> To: python-list at python.org
> Subject: Re: A fast way to read last line of gzip archive ?
> 
> Barak, Ron <Ron.Barak at lsi.com> wrote:
> > 
> > 
> > 
> > I thought maybe someone has a way to unzip just the end 
> portion of the 
> > archive (instead of the whole archive), as only the last part is 
> > needed for reading the last line.
> 
> dictzip (python implementation part of my serpento package) 
> you have to compress the file with dictzip, instead of gzip, 
> though (but dictzipped file is just a special way of 
> organizing the gzip file, so it remains perfectly compatible 
> with gunzip&comp.)

Unfortunately, the gzip archive isn't created by me, and I have no say in how it's created.
:-(

Thanks,
Ron.

> 
> 
> --
>  -----------------------------------------------------------
> | Radovan Garab?k http://kassiopeia.juls.savba.sk/~garabik/ |
> | __..--^^^--..__    garabik @ kassiopeia.juls.savba.sk     |
>  -----------------------------------------------------------
> Antivirus alert: file .signature infected by signature virus.
> Hi! I'm a signature virus! Copy me into your signature file 
> to help me spread!
> 
> 

From Scott.Daniels at Acm.Org  Sun May 24 11:06:32 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 24 May 2009 08:06:32 -0700
Subject: How does Python's OOP feel?
In-Reply-To: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
Message-ID: <T96dndkjXfi5_ITXnZ2dnUVZ_jidnZ2d@pdx.net>

Ikon wrote:
> I'm rather new to Python. I have PHP for my main language and I do
> some Java. They all have a very strict OO schema. As I red through
> Python's tutorial it seams it has nothing of those rules. No statical,
> abstract classes, functions, or variables.
> 
> I wish someone, who has experience in both Java/PHP/C# and Python
> would tell me how mush better/worse is it to program in a language
> that misses most of the OO parts!
It is freeing.  Simple experiments take far less time.  What many here
(myself included) will tell you is to spend the time you formerly
spent on defining and declaring types on creating test cases.  Then
you have nicely unit-tested code for only a bit more effort than you
had to spend on gettting a program to run before.

--Scott David  Daniels
Scott.Daniels at Acm.Org


From paul at boddie.org.uk  Sun May 24 11:16:37 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Sun, 24 May 2009 08:16:37 -0700 (PDT)
Subject: Multiprocessing and file I/O
References: <ab7dd7b6-40dd-46a7-8bda-d30d9bfbb7df@m17g2000vbi.googlegroups.com>
	<mailman.654.1243167010.8015.python-list@python.org>
	<8e21bc22-ad0e-4c18-85e2-df6e84d1afc3@n8g2000vbb.googlegroups.com>
Message-ID: <448f0706-546a-4945-aae3-00a1dcd9ea8d@c36g2000yqn.googlegroups.com>

On 24 Mai, 16:13, Infinity77 <andrea.gav... at gmail.com> wrote:
>
> No, the processing of the data is fast enough, as it is very simple.
> What I was asking is if anyone could share an example of using
> multiprocessing to read a file, along the lines I described above.

Take a look at this section in an article about multi-threaded
processing of large files:

http://effbot.org/zone/wide-finder.htm#a-multi-threaded-python-solution

Paul


From jonas.esp at googlemail.com  Sun May 24 11:33:39 2009
From: jonas.esp at googlemail.com (Kless)
Date: Sun, 24 May 2009 08:33:39 -0700 (PDT)
Subject: Set a variable as in setter
References: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>
	<Xns9C1588DDA9E0Eduncanbooth@127.0.0.1>
Message-ID: <df8b1d7a-c3ba-405a-aeb9-c57f74d552fc@g37g2000yqn.googlegroups.com>

On 24 mayo, 12:27, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Kless <jonas.... at googlemail.com> wrote:
> > Is there any way to simplify the next code? Because I'm setting a
> > variable by default of the same way than it's set in the setter.
>
> > -------------------
> > class Foo(object):
> > ? ?def __init__(self, bar):
> > ? ? ? self._bar = self._change(bar) ?# !!! as setter
>
> What's wrong with just doing this?:
> ? ? ? ? self.bar = bar

Because 'bar' is going to be modified before of be saved.


From Eric_Dexter at msn.com  Sun May 24 11:57:10 2009
From: Eric_Dexter at msn.com (edexter)
Date: Sun, 24 May 2009 08:57:10 -0700 (PDT)
Subject: wxpython and zoom/pan image
References: <e5092503-1254-4dd5-a36f-83844b9d11f0@d19g2000prh.googlegroups.com>
	<mailman.667.1243177035.8015.python-list@python.org>
Message-ID: <23e020b2-cc96-4f6e-8532-691d5eb989d4@d19g2000prh.googlegroups.com>

On May 24, 8:57?am, "Barak, Ron" <Ron.Ba... at lsi.com> wrote:
> ?Hi Ross,
> You probably would get more focused answers if you addressed the question to the wxPython list at wxpython-us... at lists.wxwidgets.org
> As for your question, seeing your (simplified) code might help: out of hand, what you want to do is catch the events you're interested in (e.g., double-left-click) and create functions/class-instances that would perform the needed actions.
> I'd suggest reading "wxPython in Action" (ISBN 1-932394-62-1) as it would give you most of the answers you seek.
> Bye,
> Ron.
>
>
>
> > -----Original Message-----
> > From: rzzzwil... at gmail.com [mailto:rzzzwil... at gmail.com]
> > Sent: Sunday, May 24, 2009 03:28
> > To: python-l... at python.org
> > Subject: wxpython and zoom/pan image
>
> > Hi,
>
> > I've googled for this, but can only find things like
> > openlayers that is a web-based javascript solution.
>
> > I need to display an image at various zoom levels and want to
> > allow the user to pan around in the Google maps style, that
> > is, left-click hold and drag. ?The code should also action
> > double-clicks on the image (but that's easy).
>
> > There are no 'standard' wxpython widgets that allow this. ?
> > Can anyone point me to information on how to implement such a
> > thing, or maybe some working code?
>
> > Thanks,
> > Ross- Hide quoted text -
>
> - Show quoted text -


I think I remember seeing an example about zooming somewhere on the
wxpython list or wiki...


From kwatch at gmail.com  Sun May 24 11:57:42 2009
From: kwatch at gmail.com (kwatch)
Date: Sun, 24 May 2009 08:57:42 -0700 (PDT)
Subject: [ANN] pyTenjin 0.7.0 - the fastest and full-featured template engine
Message-ID: <86f01119-a0e0-4f9f-833a-1f2b0c1435b2@d2g2000pra.googlegroups.com>

Hi,

I have released pyTenjin 0.7.0
http://www.kuwata-lab.com/tenjin/

pyTenjin is the fastest template engine for Python.
It is not only very fast but also full-featured and easy-to-use.
You can embed Python statements and expressions into your text file.
Tenjin converts it into Python program and evaluate it.

Features:
* very fast
  - x2 faster than Mako
  - x3 faster than Cheetah and Myghty
  - x9 faster than Django
  - x60 faster than Kid
* Full-featured
  - layout template
  - partial template
  - capturing
  - preprocessing
  - and so on...

You can see the detail of benchmark at:
http://www.kuwata-lab.com/tenjin/
(benchmark script is included in pyTenjin distribution.)


Enhancements in 0.7.0
---------------------

* Python 3.0 is now supported officially.
* Google AppEngine (GAE) supported.
  http://www.kuwata-lab.com/tenjin/pytenjin-faq.html#faq-google-appengine
* Logging support.
* enerate_tostrfun() can take not only encode-encoding but also
  decode-encoding.
* (Experimental) HTML helper functions are now provided.
* New command-line option '-a cache' supported.
* You can share caches between all engine objects.
* Pickle-base and text-base template caching support.

See CHANGES.txt for details.
  http://www.kuwata-lab.com/pytenjin-CHANGES.txt


Changes in 0.7.0
----------------

* 'cache' option for tenjin.Engine() changed.
* to_str() is changed to encode unicode object into binary(=str)
    using utf-8 encoding in default.
* Benchmark script now skips to do benchmark template libraries
  which are failed to import.


Bugfix in 0.7.0
----------------
* In preprocessing, error was raised when expression is not string.
  Now fixed.


Download and Install
--------------------

Type:

  $ sudo eazy_install Tenjin

Or:

  $ wget http://downloads.sourceforge.net/tenjin/Tenjin-0.7.0.tar.gz
  $ tar xzf Tenjin-0.7.0.tar.gz
  $ cd Tenjin-0.7.0
  $ sudo python setup.py install


Documents
---------

* User's Guide
  http://www.kuwata-lab.com/tenjin/pytenjin-users-guide.html

* FAQ
  http://www.kuwata-lab.com/tenjin/pytenjin-faq.html

* Examples
  http://www.kuwata-lab.com/tenjin/pytenjin-examples.html

* (Presentation) Tenjin - the fastest template engine in the world
  http://www.slideshare.net/kwatch/tenjin-the-wastest-template-engine-in-the-world



Have fun!

--
regards,
makoto kuwata



From piet at cs.uu.nl  Sun May 24 12:06:45 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 24 May 2009 18:06:45 +0200
Subject: Background subprocess help?
References: <mailman.609.1243044688.8015.python-list@python.org>
Message-ID: <m2eiue8oyy.fsf@cs.uu.nl>

>>>>> danshumaker <dan.shumaker at comcast.net> (d) wrote:

>d> Hi,
>d> I'm trying to do something as simple as this:

>d> "sleep 10; mail -s "test" dans < communicate_with_process &"

>d> which executes immediately because it is backgrounded with "&".

>d> or more generically in english:

>d> "do some long process in the background;  send me mail when it's done; allow
>d> me to quit the tool that started launched the long process."

This description does not correspond to the command above. First the
command is confusing because it uses quotes in a strange way. If the
quotes are meant as Python string quotes there is a problem because the
inner quotes are not escaped. If they are meant as shell quotes they
are completely wrong. So let us assume that the outer quotes are
meant at the linguistic level and the inner quotes are shell quotes. Of
course using quotes in such an ambiguous way is confusing. Moreover the
quotes around "test" are superfluous. They are only necessary if there
are spaces or other strange characters (shell metachars) in the subject
argument. 

So let us assume that the shell command you want to execute is:
sleep 10; mail -s "test" dans < communicate_with_process &

This will not do the whole thing in the background. It will do the first
part (sleep 10) and wait for it to complete; after that it will do the
mail command in the background. From your description it seems that you
want to do the combo in the background. In the shell this would be:

(sleep 10; mail -s "test" dans < communicate_with_process) &

And communicate_with_process is apparently a file; I suppose it is
written by the preceding command. If it would be the standard output of
the process it would be something like:

(sleep 10 | mail -s "test" dans) &
of course with sleep 10 replaced by something that generates output.

This is also suggested by your mentioning pipeline below.

>d> I've found several examples that are close but none of the permeatations I
>d> try work.  The closest examples I've found start sending signals to
>d> processes and/or callbacks and 50+ lines of python code.

>d> I found the cliUtils module which came close.. but no cigar.

>d> I find it hard to believe that a one liner in bash/tcsh has to end up being
>d> many lines in python.  That makes me think I'm missing something.

>d> Surely thousands of people have done this before -- start a background
>d> process and want notification when it's done.

Sequencing programs is the strength of a shell. It is not Pythons main
task, therefore it takes a little more effort for Python.

Running a combo in the background means there must be a process that
waits for the first program to complete and then starts the second one.
In the shell there will be another shell started, because of the () and
that will execute the two commands sequentially. So if you want to do it
in Python the same should be done. Python just doesn't have a convenient
syntax for this like the shell.

>d> Anybody have any suggestions on modules to  try or quick subprocess commands
>d> that work?  This came close
>d> http://docs.python.org/library/subprocess.html#replacing-shell-pipeline but
>d> no cigar too.

The easiest would be to also use the shell to do the sequencing. Why
reinvent the wheel? Like

p = Popen("sleep 10 | mail -s \"test\" dans", shell=True)

As you don't want to wait for the thing to complete, the p is almost
useless.

If you insist on doing it in Python I would recommend a fork to start
the new process. I suppose you are on a Posix system as you use & after
the shell command.

import os
from subprocess import Popen, PIPE

pid = os.fork()
if pid == 0: # child code
    p1 = Popen(["sleep", "10"], stdout=PIPE)
    p2 = Popen(["mail", "-s", "test", "dans"], stdin=p1.stdout)
    os._exit(0)

You could use: os._exit(os.waitpid(p2.pid, 0)[1]) but as you don't wait
for the child the actual exit status code is useless.

On Windows there is no fork(), therefore you would have to spawn a
separate Python program that only does the body of the if. 
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From Eric_Dexter at msn.com  Sun May 24 12:07:04 2009
From: Eric_Dexter at msn.com (edexter)
Date: Sun, 24 May 2009 09:07:04 -0700 (PDT)
Subject: Python -> R?
References: <mailman.623.1243088434.8015.python-list@python.org>
Message-ID: <42eea1a3-742c-4cc9-aaf9-54b7305dfc39@j18g2000prm.googlegroups.com>

On May 23, 8:20?am, Esmail <ebo... at hotmail.com> wrote:
> Hello!
>
> Anyone using Python scripts and accessing some of R's functionality?
> If so, what are you using? I have read about RPy, is that a good
> solution? Are there others that can be recommended or are preferred?
>
> I would prefer to code in Python instead of R :-)
>
> Thanks,
> Esmail

I was playing around with a r sound module and looking at the graphic
stuff and I have downloaded the rpy thing but I have never used
it....  I have been looking for a good excuse to use it...  It looks
like it could be useful for graphing stuff or maybe alogrithmic
(spelling I am sure) composition...  The R people have a publication
somewhat like the python papers where you might find something
intresting.


From piet at cs.uu.nl  Sun May 24 12:21:59 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 24 May 2009 18:21:59 +0200
Subject: wxPython gurus, please help
References: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>
Message-ID: <m2ab528o9k.fsf@cs.uu.nl>

>>>>> Jive Dadson <notontheweb at noisp.com> (JD) wrote:

>JD>    I have an application that opens an image file of the user's choice. I
>JD> have an exception handler for the case that the user selected a bad or
>JD> unsupported image file.  My code is catching the exception, but
>JD> unfortunately for me, after I exit the except-clause, wxPython is popping
>JD> up its own message dialog from somewhere in deepest, darkest __core__.

Do you really expect an answer? Without you giving any details, like the
essential part of your code, the actual error messages etc, how do you
think that anybody will be able to divine what is happening?

http://catb.org/esr/faqs/smart-questions.html
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From stef.mientki at gmail.com  Sun May 24 12:36:46 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 24 May 2009 18:36:46 +0200
Subject: wxPython gurus, please help
In-Reply-To: <m2ab528o9k.fsf@cs.uu.nl>
References: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>
	<m2ab528o9k.fsf@cs.uu.nl>
Message-ID: <4A19779E.1010600@gmail.com>

Piet van Oostrum wrote:
>>>>>> Jive Dadson <notontheweb at noisp.com> (JD) wrote:
>>>>>>             
>
>   
>> JD>    I have an application that opens an image file of the user's choice. I
>> JD> have an exception handler for the case that the user selected a bad or
>> JD> unsupported image file.  My code is catching the exception, but
>> JD> unfortunately for me, after I exit the except-clause, wxPython is popping
>> JD> up its own message dialog from somewhere in deepest, darkest __core__.
>>     
>
> Do you really expect an answer? Without you giving any details, like the
> essential part of your code, the actual error messages etc, how do you
> think that anybody 
he did ask for gurus ;-)
> will be able to divine what is happening?
>
> http://catb.org/esr/faqs/smart-questions.html
>   



From pythoncurious at gmail.com  Sun May 24 13:09:13 2009
From: pythoncurious at gmail.com (pythoncurious at gmail.com)
Date: Sun, 24 May 2009 10:09:13 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org> 
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com>
Message-ID: <26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com>

On May 24, 3:58?pm, John Machin <sjmac... at lexicon.net> wrote:
>
> What problems? Like avoiding having to recompile your .py files makes
> your app run too fast?
>

There are real problems with this. I'm having similar problems when
switching
between Solaris and Windows.
The code is in clearcase, which uses some sort of network file
system.
In our case, that means that I'll be accessing the same directories
from both
platforms, so .pyc-files from one platform will be visible when I run
the
code on the other platform.

The .pyc-file will contain a string pointing to the file is was built
from.
The path to that file will be different under different platforms, so
when the
string is used, there will be error printouts.
At least I think that's the problem, the error printouts contains
paths that
are only valid on the other platform.
I don't have access to those computers atm, so I can't show the exact
message.

The only solution I've seen is to make sure to clean up the .pyc files
each
time I switch platform.


From danwgrace at gmail.com  Sun May 24 13:15:28 2009
From: danwgrace at gmail.com (Daniel)
Date: Sun, 24 May 2009 10:15:28 -0700 (PDT)
Subject: command prompt: the ntvdm cpu has encountered an illegal instruction
Message-ID: <5212e4f8-d152-4f29-9d86-c0ef3f87ec3c@b1g2000vbc.googlegroups.com>

If I try to invoke python via the command prompt I get an error
"command prompt: the ntvdm cpu has encountered an illegal
instruction..."

I don't get this problem if I first cd to the python directory.  I am
running python 3.0 on windows.


From gh at ghaering.de  Sun May 24 13:32:39 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Sun, 24 May 2009 19:32:39 +0200
Subject: command prompt: the ntvdm cpu has encountered an illegal
	instruction
In-Reply-To: <5212e4f8-d152-4f29-9d86-c0ef3f87ec3c@b1g2000vbc.googlegroups.com>
References: <5212e4f8-d152-4f29-9d86-c0ef3f87ec3c@b1g2000vbc.googlegroups.com>
Message-ID: <gvc0bn$8p3$1@ger.gmane.org>

Daniel wrote:
> If I try to invoke python via the command prompt I get an error
> "command prompt: the ntvdm cpu has encountered an illegal
> instruction..."
> 
> I don't get this problem if I first cd to the python directory.  I am
> running python 3.0 on windows.

Running Python from the Cygwin shell? Try from outside Cygwin, then.

-- Gerhard



From danwgrace at gmail.com  Sun May 24 13:41:01 2009
From: danwgrace at gmail.com (Daniel)
Date: Sun, 24 May 2009 10:41:01 -0700 (PDT)
Subject: command prompt: the ntvdm cpu has encountered an illegal 
	instruction
References: <5212e4f8-d152-4f29-9d86-c0ef3f87ec3c@b1g2000vbc.googlegroups.com>
	<mailman.670.1243186373.8015.python-list@python.org>
Message-ID: <b3800c30-2c75-454c-a328-25f40234881a@e20g2000vbc.googlegroups.com>

On 24 May, 18:32, Gerhard H?ring <g... at ghaering.de> wrote:
>
> Running Python from the Cygwin shell? Try from outside Cygwin, then.
>

No I am running from the windows command prompt.



From cdalten at gmail.com  Sun May 24 13:41:53 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sun, 24 May 2009 10:41:53 -0700 (PDT)
Subject: Can I get a technical explanation on the following error
Message-ID: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>

How come something like '\'  causes an error? Here is what I mean.

[cdalten at localhost ~]$ python
Python 2.6.2 (r262:71600, May  3 2009, 17:04:44)
[GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> print "test \"
  File "<stdin>", line 1
    print "test \"
                 ^
SyntaxError: EOL while scanning string literal
>>>

I mean, isn't the '\' a character just like the letter 't'?


From jonas.esp at googlemail.com  Sun May 24 13:53:53 2009
From: jonas.esp at googlemail.com (Kless)
Date: Sun, 24 May 2009 10:53:53 -0700 (PDT)
Subject: Set a variable as in setter
References: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>
	<Xns9C1588DDA9E0Eduncanbooth@127.0.0.1>
	<df8b1d7a-c3ba-405a-aeb9-c57f74d552fc@g37g2000yqn.googlegroups.com>
Message-ID: <ecd184fa-8894-4435-8059-3f00689dae1f@s1g2000prd.googlegroups.com>

On 24 mayo, 15:33, Kless <jonas.... at googlemail.com> wrote:
> On 24 mayo, 12:27, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
>
> > Kless <jonas.... at googlemail.com> wrote:
> > > Is there any way to simplify the next code? Because I'm setting a
> > > variable by default of the same way than it's set in the setter.
>
> > > -------------------
> > > class Foo(object):
> > > ? ?def __init__(self, bar):
> > > ? ? ? self._bar = self._change(bar) ?# !!! as setter
>
> > What's wrong with just doing this?:
> > ? ? ? ? self.bar = bar
>
> Because 'bar' is going to be modified before of be saved.

Sorry! It works well. The problem was because I was using it from
iPython.


From matt at tplus1.com  Sun May 24 14:16:49 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Sun, 24 May 2009 18:16:49 GMT
Subject: I need help building a data structure for a state diagram
Message-ID: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>

I'm working on a really simple workflow for my bug tracker.  I want
filed bugs to start in an UNSTARTED status.  From there, they can go to
STARTED.

>From STARTED, bugs can go to FINISHED or ABANDONED.

I know I can easily hard-code this stuff into some if-clauses, but I
expect to need to add a lot more statuses over time and a lot more
relationships.

This seems like a crude state diagram.  So, has anyone on this list done
similar work?

How should I design this so that users can add arbitrary new statuses
and then define how to get to and from those statuses?

TIA

MAtt


From zasaconsulting at gmail.com  Sun May 24 14:46:01 2009
From: zasaconsulting at gmail.com (Alexzive)
Date: Sun, 24 May 2009 11:46:01 -0700 (PDT)
Subject: writing on file not until the end
Message-ID: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>

Hello,
I am a newby with python. I wrote the following code to extract a text
from a file and write it to another file:

linestring = open(path, 'r').read() #read all the inp file in
linestring

i=linestring.index("*NODE")
i=linestring.index("E",i)
e=linestring.index("*",i+10)
textN = linestring[i+2:e-1] # crop the ELement+nodes list
Nfile = open("N.txt", "w")
Nfile.write(textN)

unfortunately when I check N.txt some lines are missing (it only crop
until "57, 0.231749688431, 0.0405121944142" but I espect the final
line to be "242, 0.2979675, 0.224605896461". I check textN and it has
all the lines until "242..")

when I try Nfile.write(textN) again it writes some more lines but
still not all!
what is wrong whit this?

Many thanks for your help!
Alex

the original file to crop (in path) looks like this:

*HEADING
ABAQUS-style file created by OOF2 on 2009-03-05 03:23:49.204607 from a
mesh of the microstructure A.
** Materials defined by OOF2:
**   C:
**   W:
** Master elements used in OOF2:
**   2: D2_2, Isoparametric 2-noded edge element
**   3: T3_3, Isoparametric 3 noded triangle with linear interpolation
for both fields and positions.
**   4: Q4_4, Isoparametric 4 noded quadrilateral with bilinear
interpolation for both positions and fields
** Boundary Conditions:
** Notes:
**   The set of nodes and elements may be different from the set
created from a skeleton
**    depending on the element type and if the mesh was refined.
**   The materials and boundary conditions provided by OOF2 may be
translated into ABAQUS by the user.
**   The element type provided below should be verified and modified
accordingly.
**   Only elements (and nodes of such elements) that have an
associated material are included in this file.
*NODE
6, 0.0, 0.0
1, 0.031365, 0.0
9, 0.06273, 0.0
10, 0.094095, 0.0
17, 0.12546, 0.0
18, 0.156825, 0.0
29, 0.18819, 0.0
33, 0.219555, 0.0
37, 0.25092, 0.0
38, 0.282285, 0.0
245, 0.31365, 0.0
4, 0.0, 0.027505735912
7, 0.0283153247289, 0.0247564240049
8, 0.06273, 0.0236123
13, 0.126933916405, 0.0219324392255
22, 0.156825, 0.0236123
25, 0.185442602873, 0.0174188364874
35, 0.216158167035, 0.0260087067213
41, 0.25092, 0.0236123
65, 0.31365, 0.0265806479154
45, 0.0, 0.0472246
44, 0.0270022417013, 0.0457250093507
46, 0.06273, 0.0472246
47, 0.0987777090467, 0.0476663143118
48, 0.123432920369, 0.0493041533953
50, 0.157517619392, 0.0491485665468
54, 0.18819, 0.0472246
56, 0.21829479153, 0.0489914989989
59, 0.255396164365, 0.053642386456
62, 0.283534894472, 0.0482125495477
66, 0.31365, 0.0473757108379
68, 0.0, 0.0708369
71, 0.031365, 0.0708369
73, 0.0667269869261, 0.0724057787737
74, 0.094095, 0.0708369
75, 0.122035555525, 0.0683265441516
77, 0.154069643632, 0.067833220225
79, 0.192676294482, 0.0697610582702
80, 0.218433034079, 0.0733140035725
81, 0.250592391777, 0.0705659765909
115, 0.31365, 0.0749934030765
86, 0.0, 0.0937712452856
87, 0.0327416679167, 0.0988320724937
92, 0.0642181016634, 0.0996865210439
94, 0.0939583966251, 0.0960413983543
98, 0.12277254344, 0.0956157005759
101, 0.156825, 0.0944492
107, 0.190080813107, 0.0989004943145
109, 0.219555, 0.0944492
111, 0.25092, 0.0944492
116, 0.31365, 0.0913902112346
117, 0.0, 0.118185969919
118, 0.031365, 0.1180615
119, 0.0657061477957, 0.117247512024
120, 0.0954076666726, 0.117579706786
122, 0.120457073874, 0.118852698163
125, 0.150412085671, 0.119805228459
128, 0.188401966746, 0.118578758447
132, 0.219555, 0.1180615
131, 0.25092, 0.1180615
134, 0.282285, 0.1180615
138, 0.0, 0.1416738
137, 0.031365, 0.1416738
139, 0.06273, 0.1416738
140, 0.0981318888408, 0.141731507791
160, 0.156825, 0.1416738
145, 0.18819, 0.1416738
144, 0.21849787291, 0.144222847202
146, 0.25214522485, 0.139721206044
147, 0.287968204391, 0.138882348861
151, 0.0, 0.1652861
152, 0.031365, 0.1652861
153, 0.06273, 0.1652861
154, 0.094095, 0.1652861
156, 0.124683249222, 0.165861357563
189, 0.156825, 0.1652861
163, 0.189978244061, 0.168552116135
193, 0.219555, 0.1652861
170, 0.251953134991, 0.166067888686
175, 0.31365, 0.1652861
179, 0.0, 0.1888984
178, 0.031365, 0.1888984
180, 0.06273, 0.1888984
181, 0.0948683944207, 0.186105991855
184, 0.12546, 0.1888984
185, 0.156825, 0.1888984
191, 0.185226863639, 0.189033619679
192, 0.21459450643, 0.190219519385
196, 0.248868626255, 0.189540639649
197, 0.277613280215, 0.188996385139
200, 0.31365, 0.188840621897
201, 0.0, 0.2125107
202, 0.031365, 0.2125107
203, 0.061560970472, 0.211435761567
206, 0.094095, 0.2125107
208, 0.123520746115, 0.217288884383
212, 0.156824305885, 0.210136954906
215, 0.19080765368, 0.21182785412
216, 0.219555, 0.2125107
217, 0.24652142594, 0.211374186361
219, 0.282347639617, 0.2121001649
220, 0.31365, 0.213088792923
222, 0.0, 0.236123
221, 0.031365, 0.236123
224, 0.06273, 0.236123
226, 0.094095, 0.236123
230, 0.12546, 0.236123
236, 0.156825, 0.236123
237, 0.18819, 0.236123
238, 0.219555, 0.236123
246, 0.25092, 0.236123
239, 0.282285, 0.236123
244, 0.31365, 0.236123
2, 0.0150409063102, 0.0175241129844
5, 0.0, 0.0143072034694
3, 0.0156825, 0.0
11, 0.0944401447071, 0.0170218543566
12, 0.108202138276, 0.0142655596685
14, 0.1097775, 0.0236123
16, 0.1097775, 0.0
15, 0.12546, 0.01180615
19, 0.1411425, 0.01180615
20, 0.137460594687, 0.0
23, 0.157190514557, 0.0120435227667
21, 0.1411425, 0.0236123
24, 0.1725075, 0.01180615
26, 0.1725075, 0.0236123
28, 0.174079024203, 0.0
27, 0.18819, 0.01180615
30, 0.20326319059, 0.0099544646677
31, 0.203137388716, 0.0
34, 0.217996940452, 0.0162543067349
32, 0.201648730844, 0.0253407563922
36, 0.25092, 0.01180615
39, 0.265091546036, 0.0115111489103
40, 0.265188659994, 0.0
43, 0.2979675, 0.0132903239577
42, 0.269085418102, 0.0219175315684
49, 0.14331614143, 0.0389180302184
51, 0.156825, 0.03541845
52, 0.170034925911, 0.0302540838763
55, 0.187241635364, 0.0308634812215
53, 0.170973146505, 0.0466686190136
57, 0.231749688431, 0.0405121944142
t60, 0.250420691759, 0.0399644155193
58, 0.234883810317, 0.0488399925217
61, 0.2666025, 0.03541845
63, 0.261841754198, 0.0453458988094
64, 0.283647280911, 0.0331311643709
67, 0.00997528838099, 0.059251007707
70, 0.026431195612, 0.0585429396298
69, 0.0156825, 0.0708369
72, 0.0470475, 0.0708369
76, 0.1411425, 0.0708369
104, 0.172905294963, 0.0687591528112
78, 0.189370395463, 0.0578988574842
82, 0.262145728385, 0.0567820182347
84, 0.282965777504, 0.0591653776972
83, 0.265510384054, 0.0711987638019
85, 0.0139070458991, 0.0765358149114
88, 0.031365, 0.08264305
89, 0.0463012651661, 0.0875761693955
91, 0.0595508652878, 0.083794762795
90, 0.0521108640296, 0.100487743127
93, 0.0784125, 0.08264305
95, 0.0759417426685, 0.094062139992
97, 0.125079439202, 0.0851866737525
96, 0.113088578118, 0.0953941670146
99, 0.143620352067, 0.0847078895557
100, 0.141046495561, 0.096007596875
102, 0.155098055673, 0.0796347264443
103, 0.172456234293, 0.0843806927744
106, 0.192866733648, 0.0862017124287
105, 0.175478179057, 0.0961076917822
108, 0.206360054844, 0.0816320301498
110, 0.203328294152, 0.0983508749474
112, 0.265850130274, 0.0841722754528
113, 0.283000506379, 0.0840718733578
114, 0.303036176529, 0.0912194545513
121, 0.111243800079, 0.102959886527
123, 0.12546, 0.10625535
124, 0.145186532288, 0.106177357559
126, 0.156825, 0.10625535
127, 0.177405333868, 0.10909704185
129, 0.1725075, 0.1180615
130, 0.18819, 0.10625535
133, 0.284435184261, 0.103796377701
136, 0.300997320603, 0.104240413217
135, 0.31365, 0.109425841822
141, 0.111351058915, 0.124763865227
143, 0.122330041541, 0.130632700189
142, 0.112021299889, 0.141456280139
243, 0.156825, 0.12986765
166, 0.174585056762, 0.136596948305
148, 0.2979675, 0.12986765
149, 0.31365, 0.132737078008
150, 0.302337133041, 0.140742193464
155, 0.110958484372, 0.156488764047
157, 0.123506443041, 0.151563704181
158, 0.138959817302, 0.151649897722
161, 0.158211487404, 0.158307767024
159, 0.140308231574, 0.169185557451
162, 0.174346818609, 0.14887558308
164, 0.176749514131, 0.168899157395
165, 0.18819, 0.15347995
167, 0.2038725, 0.15347995
169, 0.218436569511, 0.154768432689
168, 0.20646420232, 0.163454153961
172, 0.2352375, 0.15347995
171, 0.2352375, 0.1652861
174, 0.282285, 0.15347995
173, 0.299052995126, 0.151252115601
176, 0.296157702422, 0.164094288997
177, 0.31365, 0.147922235167
183, 0.12546, 0.17709225
182, 0.115020521952, 0.189065620836
187, 0.143150811124, 0.176461278361
186, 0.138367010451, 0.187435512478
188, 0.156825, 0.17709225
190, 0.174773303996, 0.179131868025
194, 0.223398006386, 0.175796432928
195, 0.2352375, 0.17709225
198, 0.283410759935, 0.175681933912
199, 0.295448251155, 0.176846292296
204, 0.0922385576628, 0.201463078266
205, 0.078759504717, 0.208169638245
207, 0.107329430815, 0.199650268966
209, 0.107340529686, 0.214649306608
210, 0.126314562813, 0.196624227919
211, 0.137598251382, 0.200265546052
213, 0.143355236652, 0.21294448339
214, 0.1725075, 0.2125107
218, 0.263507995658, 0.208989696919
223, 0.06273, 0.22431685
225, 0.0720254659882, 0.221339169391
227, 0.0784125, 0.236123
228, 0.0983042590694, 0.222777379368
229, 0.107905816156, 0.231588924845
231, 0.128500216507, 0.22426970333
232, 0.1411425, 0.22431685
233, 0.145352032138, 0.236123
234, 0.160670487099, 0.221709277836
235, 0.173524670602, 0.224567595595
241, 0.265582570598, 0.221943044414
240, 0.264044860278, 0.236123
242, 0.2979675, 0.224605896461
** The OOF2 element type is T3_3. The type provided for ABAQUS is only
a guess
** and may have to be modified by the user to be meaningful.
*ELEMENT, TYPE=CPS3
1, 1, 2, 3
2, 4, 5, 2
3, 6, 3, 5
4, 2, 5, 3
5, 2, 7, 4
6, 2, 1, 7
7, 1, 8, 7
8, 8, 1, 9
9, 10, 8, 9
10, 11, 8, 10
11, 10, 12, 11
12, 13, 14, 12
13, 12, 14, 11
14, 13, 12, 15
15, 10, 16, 12
16, 17, 15, 16
17, 12, 16, 15
18, 18, 19, 20
19, 17, 20, 15
20, 19, 15, 20
21, 13, 19, 21
22, 22, 21, 23
23, 19, 23, 21
24, 18, 24, 23
25, 25, 26, 24
26, 22, 23, 26
27, 24, 26, 23
28, 25, 24, 27
29, 18, 28, 24
30, 29, 27, 28
31, 24, 28, 27
32, 25, 27, 30
33, 30, 27, 31
34, 25, 30, 32
35, 33, 34, 30
36, 35, 32, 34
37, 36, 33, 37
38, 38, 39, 40
39, 41, 36, 39
40, 37, 40, 36
41, 39, 36, 40
42, 41, 39, 42
43, 38, 43, 39
44, 39, 43, 42
45, 4, 44, 45
46, 44, 4, 7
47, 8, 44, 7
48, 44, 8, 46
49, 8, 47, 46
50, 14, 13, 47
51, 47, 13, 48
52, 49, 48, 13
53, 49, 50, 48
54, 50, 49, 51
55, 13, 21, 49
56, 22, 51, 21
57, 49, 21, 51
58, 50, 52, 53
59, 54, 53, 55
60, 55, 56, 54
61, 32, 35, 56
62, 57, 56, 35
63, 56, 57, 58
64, 59, 58, 60
65, 57, 60, 58
66, 41, 61, 60
67, 62, 63, 61
68, 59, 60, 63
69, 61, 63, 60
70, 62, 61, 64
71, 41, 42, 61
72, 61, 42, 64
73, 64, 65, 62
74, 62, 65, 66
75, 67, 45, 44
76, 67, 68, 45
77, 68, 67, 69
78, 44, 70, 67
79, 71, 69, 70
80, 67, 70, 69
81, 72, 71, 70
82, 72, 70, 44
83, 47, 73, 46
84, 73, 47, 74
85, 47, 75, 74
86, 75, 47, 48
87, 50, 75, 48
88, 76, 50, 77
89, 76, 75, 50
90, 78, 56, 79
91, 78, 54, 56
92, 79, 56, 80
93, 56, 81, 80
94, 58, 81, 56
95, 58, 59, 81
96, 59, 82, 81
97, 59, 63, 82
98, 63, 62, 82
99, 81, 82, 83
100, 62, 84, 82
101, 82, 84, 83
102, 85, 86, 68
103, 85, 87, 86
104, 87, 85, 88
105, 68, 69, 85
106, 73, 89, 72
107, 87, 88, 89
108, 71, 72, 88
109, 89, 88, 72
110, 87, 89, 90
111, 73, 91, 89
112, 92, 90, 91
113, 89, 91, 90
114, 73, 93, 91
115, 94, 95, 93
116, 92, 91, 95
117, 93, 95, 91
118, 93, 74, 94
119, 93, 73, 74
120, 75, 94, 74
121, 75, 96, 94
122, 75, 97, 96
123, 97, 98, 96
124, 75, 99, 97
125, 98, 97, 100
126, 99, 100, 97
127, 101, 99, 102
128, 75, 76, 99
129, 77, 102, 76
130, 99, 76, 102
131, 79, 103, 104
132, 101, 102, 103
133, 77, 104, 102
134, 101, 103, 105
135, 79, 106, 103
136, 107, 105, 106
137, 79, 108, 106
138, 109, 110, 108
139, 107, 106, 110
140, 108, 110, 106
141, 108, 80, 109
142, 108, 79, 80
143, 81, 109, 80
144, 109, 81, 111
145, 112, 111, 81
146, 81, 83, 112
147, 112, 83, 113
148, 114, 115, 116
149, 87, 117, 86
150, 117, 87, 118
151, 87, 119, 118
152, 90, 119, 87
153, 90, 92, 119
154, 95, 119, 92
155, 95, 94, 119
156, 119, 94, 120
157, 121, 120, 94
158, 121, 122, 120
159, 122, 121, 123
160, 94, 96, 121
161, 98, 123, 96
162, 121, 96, 123
163, 101, 124, 100
164, 122, 123, 124
165, 98, 100, 123
166, 124, 123, 100
167, 122, 124, 125
168, 124, 101, 126
169, 124, 126, 125
170, 101, 127, 126
171, 128, 129, 127
172, 125, 126, 129
173, 127, 129, 126
174, 128, 127, 130
175, 101, 105, 127
176, 107, 130, 105
177, 127, 105, 130
178, 128, 130, 110
179, 130, 107, 110
180, 109, 131, 132
181, 131, 109, 111
182, 133, 134, 131
183, 116, 135, 114
184, 136, 114, 135
185, 117, 137, 138
186, 137, 117, 118
187, 119, 137, 118
188, 137, 119, 139
189, 119, 140, 139
190, 140, 119, 120
191, 141, 120, 122
192, 141, 140, 120
193, 140, 141, 142
194, 122, 143, 141
195, 141, 143, 142
196, 128, 144, 145
197, 144, 128, 132
198, 131, 144, 132
199, 144, 131, 146
200, 131, 147, 146
201, 147, 131, 134
202, 148, 149, 150
203, 137, 151, 138
204, 151, 137, 152
205, 137, 153, 152
206, 153, 137, 139
207, 140, 153, 139
208, 153, 140, 154
209, 155, 154, 140
210, 155, 156, 154
211, 156, 155, 157
212, 140, 142, 155
213, 155, 142, 157
214, 158, 156, 157
215, 156, 158, 159
216, 160, 161, 158
217, 158, 161, 159
218, 160, 162, 161
219, 163, 164, 162
220, 163, 162, 165
221, 145, 165, 166
222, 162, 166, 165
223, 144, 167, 145
224, 167, 163, 165
225, 167, 165, 145
226, 163, 167, 168
227, 167, 169, 168
228, 170, 171, 172
229, 172, 146, 170
230, 172, 144, 146
231, 147, 173, 174
232, 175, 176, 173
233, 173, 176, 174
234, 175, 173, 177
235, 173, 150, 177
236, 151, 178, 179
237, 178, 151, 152
238, 153, 178, 152
239, 178, 153, 180
240, 153, 181, 180
241, 181, 153, 154
242, 156, 181, 154
243, 156, 182, 181
244, 156, 183, 182
245, 183, 184, 182
246, 185, 186, 187
247, 184, 183, 186
248, 187, 186, 183
249, 185, 187, 188
250, 189, 188, 159
251, 187, 159, 188
252, 163, 190, 164
253, 185, 188, 190
254, 189, 164, 188
255, 190, 188, 164
256, 190, 191, 185
257, 190, 163, 191
258, 163, 192, 191
259, 163, 168, 192
260, 168, 193, 194
261, 168, 194, 192
262, 170, 195, 171
263, 192, 194, 195
264, 193, 171, 194
265, 195, 194, 171
266, 195, 196, 192
267, 195, 170, 196
268, 170, 197, 196
269, 198, 197, 170
270, 175, 199, 176
271, 197, 198, 199
272, 199, 198, 176
273, 199, 200, 197
274, 199, 175, 200
275, 178, 201, 179
276, 201, 178, 202
277, 178, 203, 202
278, 203, 178, 180
279, 181, 204, 205
280, 204, 206, 205
281, 181, 207, 204
282, 208, 209, 207
283, 206, 204, 209
284, 207, 209, 204
285, 208, 207, 210
286, 181, 182, 207
287, 184, 210, 182
288, 207, 182, 210
289, 185, 211, 186
290, 208, 210, 211
291, 184, 186, 210
292, 211, 210, 186
293, 212, 211, 185
294, 212, 213, 211
295, 213, 208, 211
296, 214, 185, 215
297, 214, 212, 185
298, 215, 185, 191
299, 192, 215, 191
300, 215, 192, 216
301, 192, 217, 216
302, 217, 192, 196
303, 218, 197, 219
304, 197, 220, 219
305, 220, 197, 200
306, 201, 221, 222
307, 221, 201, 202
308, 223, 224, 221
309, 203, 225, 223
310, 226, 227, 225
311, 224, 223, 227
312, 225, 227, 223
313, 226, 225, 228
314, 203, 205, 225
315, 206, 228, 205
316, 225, 205, 228
317, 208, 229, 209
318, 226, 228, 229
319, 206, 209, 228
320, 229, 228, 209
321, 226, 229, 230
322, 229, 208, 231
323, 229, 231, 230
324, 208, 232, 231
325, 230, 231, 233
326, 232, 233, 231
327, 208, 213, 232
328, 232, 213, 234
329, 215, 235, 214
330, 236, 234, 235
331, 212, 214, 234
332, 235, 234, 214
333, 235, 237, 236
334, 235, 215, 237
335, 215, 238, 237
336, 238, 215, 216
337, 217, 238, 216
338, 239, 240, 241
339, 239, 241, 242
340, 217, 218, 241
341, 219, 242, 218
342, 241, 218, 242
343, 242, 219, 220
344, 84, 115, 113
345, 113, 83, 84
346, 159, 183, 156
347, 159, 187, 183
348, 243, 160, 143
349, 177, 150, 149
350, 32, 55, 25
351, 32, 56, 55
352, 113, 115, 114
353, 143, 157, 142
354, 160, 158, 143
355, 158, 157, 143
356, 52, 22, 26
357, 52, 51, 22
358, 218, 196, 197
359, 218, 217, 196
360, 36, 34, 33
361, 36, 41, 34
362, 128, 166, 129
363, 160, 243, 166
364, 166, 243, 129
365, 145, 166, 128
366, 110, 132, 128
367, 110, 109, 132
368, 198, 170, 174
369, 174, 176, 198
370, 34, 57, 35
371, 34, 41, 57
372, 223, 202, 203
373, 223, 221, 202
374, 47, 8, 11
375, 14, 47, 11
376, 84, 66, 115
377, 84, 62, 66
378, 205, 180, 181
379, 205, 203, 180
380, 72, 46, 73
381, 72, 44, 46
382, 125, 143, 122
383, 125, 243, 143
384, 133, 131, 111
385, 133, 114, 136
386, 113, 114, 133
387, 112, 133, 111
388, 242, 244, 239
389, 242, 220, 244
390, 43, 245, 65
391, 43, 38, 245
392, 241, 240, 246
393, 246, 238, 217
394, 217, 241, 246
395, 64, 43, 65
396, 43, 64, 42
397, 26, 55, 52
398, 26, 25, 55
399, 85, 71, 88
400, 85, 69, 71
401, 174, 146, 147
402, 174, 170, 146
403, 50, 104, 77
404, 79, 104, 78
405, 50, 53, 104
406, 104, 53, 78
** Point boundaries in OOF2
*NSET, NSET=topleft
222
*NSET, NSET=bottomleft
6
*NSET, NSET=topright
244
*NSET, NSET=bottomright
245
** Edge boundaries in OOF2
*NSET, NSET=top
244, 239, 240, 246, 238, 237, 236, 233, 230, 226, 227, 224, 221, 222
*NSET, NSET=right
245, 65, 66, 115, 116, 135, 149, 177, 175, 200, 220, 244
*NSET, NSET=left
222, 201, 179, 151, 138, 117, 86, 68, 45, 4, 5, 6
*NSET, NSET=bottom
6, 3, 1, 9, 10, 16, 17, 20, 18, 28, 29, 31, 33, 37, 40, 38,
245
*ELSET, ELSET=C
21, 55, 57, 77, 105, 109, 111, 115, 117, 160, 161, 162, 165, 212, 213,
232,
271, 272, 290, 291, 292, 399, 400
*SOLID SECTION, ELSET=C, MATERIAL=C
*ELSET, ELSET=W
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33,
34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49,
50, 51, 52, 53, 54, 56, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67,
68, 69, 70, 71, 72, 73, 74, 75, 76, 78, 79, 80, 81, 82, 83, 84,
85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100,
101, 102, 103, 104, 106, 107, 108, 110, 112, 113, 114, 116, 118, 119,
120, 121,
122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135,
136, 137,
138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151,
152, 153,
154, 155, 156, 157, 158, 159, 163, 164, 166, 167, 168, 169, 170, 171,
172, 173,
174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187,
188, 189,
190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203,
204, 205,
206, 207, 208, 209, 210, 211, 214, 215, 216, 217, 218, 219, 220, 221,
222, 223,
224, 225, 226, 227, 228, 229, 230, 231, 233, 234, 235, 236, 237, 238,
239, 240,
241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254,
255, 256,
257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270,
273, 274,
275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288,
289, 293,
294, 295, 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307,
308, 309,
310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323,
324, 325,
326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339,
340, 341,
342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355,
356, 357,
358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371,
372, 373,
374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387,
388, 389,
390, 391, 392, 393, 394, 395, 396, 397, 398, 401, 402, 403, 404, 405,
406
*SOLID SECTION, ELSET=W, MATERIAL=W
*MATERIAL, NAME=C
** Use the information in the header to complete these fields under
MATERIAL
*MATERIAL, NAME=W
** Use the information in the header to complete these fields under
MATERIAL


From heintest at web.de  Sun May 24 14:47:24 2009
From: heintest at web.de (=?ISO-8859-1?Q?Hans_M=FCller?=)
Date: Sun, 24 May 2009 20:47:24 +0200
Subject: Can I get a technical explanation on the following error
In-Reply-To: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
Message-ID: <4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>

Try this:

print "\\"

\ is the escape character, it masks the meaning of the next chararcter.

If you write print "\" python tries to print " (the meaning of " as
the string delimiter is beeing masked) and finds no closing "
This is why you got the error.

hth.

Greetings
Hans


From dasdasich at googlemail.com  Sun May 24 14:48:59 2009
From: dasdasich at googlemail.com (DasIch)
Date: Sun, 24 May 2009 20:48:59 +0200
Subject: Can I get a technical explanation on the following error
In-Reply-To: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
Message-ID: <200905242048.59288.dasdasich@googlemail.com>

'\' starts a escape sequence. You need to escape '\' with a '\' to make it 
work. 
>>> print 'test \\'
test \



From bottleh20 at gmail.com  Sun May 24 14:56:04 2009
From: bottleh20 at gmail.com (Water Bottle)
Date: Sun, 24 May 2009 14:56:04 -0400
Subject: Problems with StaticBitmaps and events
In-Reply-To: <c8a21b110905231432q175a3ebay8111f4cf37dc4977@mail.gmail.com>
References: <c8a21b110905231432q175a3ebay8111f4cf37dc4977@mail.gmail.com>
Message-ID: <c8a21b110905241156n6ae94d6bnbcb643f5d80979f@mail.gmail.com>

Okay, I found the root of the weird box problem on the top left corner. It
has something to do with my panels. I changed the code so that I directly
used the StaticBitmap and TextCtrl inside the Frame class and the weird box
was gone. I'm not sure what I'm doing wrong with the Panels. Can anyone
help?

Also, I poked around other forums and it seems StaticBitmaps doesn't really
trigger events (it's a static control). I tried using GenStaticBitmaps in
the wx.lib.statbmp, and was able to achieve some triggers (for example,
wx.EVT_ENTER_WINDOW). However, I want to make it so that my picture is a
button without having to look like one of the standard looking buttons (like
you have in wx.BitmapButton). Is there some sort of way to do that?

Thanks.
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From python.list at tim.thechases.com  Sun May 24 15:20:04 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 24 May 2009 14:20:04 -0500
Subject: I need help building a data structure for a state diagram
In-Reply-To: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>
References: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>
Message-ID: <4A199DE4.807@tim.thechases.com>

> I'm working on a really simple workflow for my bug tracker.  I want
> filed bugs to start in an UNSTARTED status.  From there, they can go to
> STARTED.
> 
>>From STARTED, bugs can go to FINISHED or ABANDONED.
> 
> I know I can easily hard-code this stuff into some if-clauses, but I
> expect to need to add a lot more statuses over time and a lot more
> relationships.
> 
> This seems like a crude state diagram.  So, has anyone on this list done
> similar work?

I've got a similar workflow in one of my applications at work.  I 
use a database to persist the available states along with their 
transitions.  Both the states themselves and the transitions have 
various attributes to them to facilitate my workflows.  The 
following schema should work in most databases such as sqlite 
(included with Python2.5+) with minor syntactic tweaks (such as 
auto-increment)

   CREATE TABLE States (
    id INT PRIMARY KEY AUTOINCREMENT,
    description VARCHAR(50),
    other_attributes ...
   );

   CREATE TABLE Transitions (
    id INT PRIMARY KEY AUTOINCREMENT,
    from_state INT NOT NULL REFERENCES States(id),
    to_state INT NOT NULL REFERENCES States(id),
    other_attributes ...
   );
   INSERT INTO States (description) VALUES
    ('Started'),
    ('Finished'),
    ('Abandoned');
   INSERT INTO Transitions (from_state, to_state) VALUES
    (1, 2), -- Started -> Finished
    (1, 3), -- Started -> Abandoned
    (3, 2);  -- Abandoned -> Finished

You can then query states you can transition to:

   SELECT s1.description, s2.description, t.other_attributes
   FROM Transitions t
   INNER JOIN States s1
   ON s1.id = t.from_id
   INNER JOIN States s2
   ON s2.id = t.to_id
   -- WHERE t.from_id = @current_id
   ORDER BY s1.description, s2.description


You can easily add more state rows as well as transition rows to 
the tables.  Then use the other_attributes of either the 
transition or the state to control the workflows (we have 
transition attributes for things like "notifies account-manager", 
"notifies customer", "number of days that must pass from initial 
workflow-start", "number of days that must pass from most recent 
status change", "does this transition happen manually or 
automatically via an overnight script", etc.)  The workflow 
processing code then looks at these attributes for the transition 
that's being attempted, and behaves accordingly.

Hope this gives you some ideas.  If you want to read more, the 
magic google-words are "finite state automaton" (FSA) or "finite 
state machine" (FSM)[1]

-tkc

[1]
http://en.wikipedia.org/wiki/Finite_state_machine








From bottleh20 at gmail.com  Sun May 24 15:30:31 2009
From: bottleh20 at gmail.com (Water Bottle)
Date: Sun, 24 May 2009 15:30:31 -0400
Subject: Problems with StaticBitmaps and events
In-Reply-To: <c8a21b110905231432q175a3ebay8111f4cf37dc4977@mail.gmail.com>
References: <c8a21b110905231432q175a3ebay8111f4cf37dc4977@mail.gmail.com>
Message-ID: <c8a21b110905241230p449941ddp35d141aa4426368@mail.gmail.com>

Hm, so it seems that it was just a sizing issue with my wx.Panels. I defined
my own size, and that fixed the weird box problem. Although, now that I'm
defining the size, that may not be good for when I expand the window.
Everything will be stretched. Anyone know a way around that?

Still having trouble with the GenStaticBitmap and the events. Can't seem to
find an event that uses 'clickable' as a trigger (like EVT_BUTTON, but that
doesn't work with GenStaticBitmap)
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From kay at fiber-space.de  Sun May 24 15:42:01 2009
From: kay at fiber-space.de (Kay Schluehr)
Date: Sun, 24 May 2009 12:42:01 -0700 (PDT)
Subject: I need help building a data structure for a state diagram
References: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>
Message-ID: <89cbdfa9-2107-47c3-900c-ac0b574614a3@r37g2000yqd.googlegroups.com>

On 24 Mai, 20:16, Matthew Wilson <m... at tplus1.com> wrote:
> I'm working on a really simple workflow for my bug tracker. ?I want
> filed bugs to start in an UNSTARTED status. ?From there, they can go to
> STARTED.
>
> From STARTED, bugs can go to FINISHED or ABANDONED.
>
> I know I can easily hard-code this stuff into some if-clauses, but I
> expect to need to add a lot more statuses over time and a lot more
> relationships.
>
> This seems like a crude state diagram. ?So, has anyone on this list done
> similar work?
>
> How should I design this so that users can add arbitrary new statuses
> and then define how to get to and from those statuses?
>
> TIA
>
> MAtt

General answer: you can encode finite state machines as grammars.
States as non-terminals and transition labels as terminals:

UNSTARTED: 'start' STARTED
STARTED: 'ok' FINISHED | 'cancel' ABANDONED
ABANDONED: 'done'
FINISHED: 'done'

In some sense each state-machine is also a little language.


From cdalten at gmail.com  Sun May 24 16:14:44 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sun, 24 May 2009 13:14:44 -0700 (PDT)
Subject: Can I get a technical explanation on the following error
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
	<4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>

On May 24, 11:47 am, Hans M?ller <heint... at web.de> wrote:
> Try this:
>
> print "\\"
>
> \ is the escape character, it masks the meaning of the next chararcter.
>
> If you write print "\" python tries to print " (the meaning of " as
> the string delimiter is beeing masked) and finds no closing "
> This is why you got the error.
>

So something like

"\"

changes the meaning of " ? How? Does it just shift the ASCII bit(s)?


From bsk16 at case.edu  Sun May 24 16:15:15 2009
From: bsk16 at case.edu (Benjamin Kaplan)
Date: Sun, 24 May 2009 16:15:15 -0400
Subject: writing on file not until the end
In-Reply-To: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
Message-ID: <ec96e1390905241315x56dea631r94595b4b52c9f2ba@mail.gmail.com>

On Sun, May 24, 2009 at 2:46 PM, Alexzive <zasaconsulting at gmail.com> wrote:

> Hello,
> I am a newby with python. I wrote the following code to extract a text
> from a file and write it to another file:
>
> linestring = open(path, 'r').read() #read all the inp file in
> linestring
>
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)
>
> unfortunately when I check N.txt some lines are missing (it only crop
> until "57, 0.231749688431, 0.0405121944142" but I espect the final
> line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> all the lines until "242..")
>
> when I try Nfile.write(textN) again it writes some more lines but
> still not all!
> what is wrong whit this?
>
> Many thanks for your help!
> Alex
>
> the original file to crop (in path) looks like this:


[snip file]

I didn't test this, but I would guess you're seeing this because of
buffering. Try adding Nfile.flush() to the end.
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From clp2 at rebertia.com  Sun May 24 16:24:09 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 24 May 2009 13:24:09 -0700
Subject: Can I get a technical explanation on the following error
In-Reply-To: <1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
	<4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>
	<1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
Message-ID: <50697b2c0905241324l6b30e0cs22e0ca4edd46df34@mail.gmail.com>

On Sun, May 24, 2009 at 1:14 PM, grocery_stocker <cdalten at gmail.com> wrote:
> On May 24, 11:47 am, Hans M?ller <heint... at web.de> wrote:
>> Try this:
>>
>> print "\\"
>>
>> \ is the escape character, it masks the meaning of the next chararcter.
>>
>> If you write print "\" python tries to print " (the meaning of " as
>> the string delimiter is beeing masked) and finds no closing "
>> This is why you got the error.
>>
>
> So something like
>
> "\"
>
> changes the meaning of " ? How? Does it just shift the ASCII bit(s)?

No, the Python parser handles it when it parses string literals.

Cheers,
Chris
-- 
http://blog.rebertia.com


From basti.wiesner at gmx.net  Sun May 24 16:37:03 2009
From: basti.wiesner at gmx.net (Sebastian Wiesner)
Date: Sun, 24 May 2009 22:37:03 +0200
Subject: LaTeXing python programs
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
	<mailman.461.1242845176.8015.python-list@python.org>
	<i8udnbmVfdskxYnXnZ2dnUVZ_tBi4p2d@rcn.net>
	<mailman.465.1242853870.8015.python-list@python.org>
	<bdd7618d-53a4-48f8-bd0d-8a218d766c5a@n21g2000vba.googlegroups.com>
Message-ID: <gvcb5b$sfv$1@hoshi.visyn.net>

<Edward Grefenstette ? Donnerstag, 21. Mai 2009 00:27>

> On May 20, 10:10 pm, John Reid <j.r... at mail.cryst.bbk.ac.uk> wrote:
>> Alan G Isaac wrote:
>> > The listings package is great and highly configurable.
>> > Note that you can also input entire files of Python code
>> > or pieces of them based on markers.  Really quite great.
>>
>> I tried listings. I believe pygments makes better formatted output (at
>> least out of the box).
> 
> I'm trying to figure out how to use pygments. Are there any good usage
> examples out there?

It's not really difficult.   First choose a pygments style and create the 
latex definitions for it (STYLENAME serves as placeholder here):

pygmentize -S STYLENAME -f latex > pygments_style.tex

Now import the required packages and the style definitions:

\usepackage{color]
\usepackage{fancyvbr}
\input{pygments_style.tex}

These packages are included in Tetex as well as in Texlive, if not, you can 
of course install them from CTAN.

To format a snippet of code, run pygmentize and copy the output into your 
document:

pygmentize -f latex a_python_file.py

That's it.

-- 
Freedom is always the freedom of dissenters.
                                      (Rosa Luxemburg)



From davea at dejaviewphoto.com  Sun May 24 17:19:29 2009
From: davea at dejaviewphoto.com (Dave Angel)
Date: Sun, 24 May 2009 17:19:29 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <gvas9k$vvf$1@lust.ihug.co.nz>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.525.1242941777.8015.python-list@python.org>
	<gvas9k$vvf$1@lust.ihug.co.nz>
Message-ID: <4A19B9E1.9060005@dejaviewphoto.com>

Lawrence D'Oliveiro wrote:
> In message <mailman.525.1242941777.8015.python-list at python.org>, Christian 
> Heimes wrote:
>
>   
>> Welcome to IEEE 754 floating point land! :)
>>     
>
> It used to be worse in the days before IEEE 754 became widespread. Anybody 
> remember a certain Prof William Kahan from Berkeley, and the foreword he 
> wrote to the Apple Numerics Manual, 2nd Edition, published in 1988? It's 
> such a classic piece that I think it should be posted somewhere...
>
>
>   
I remember the professor.  He was responsible for large parts of the 
Intel 8087 specification, which later got mostly codified as IEEE 754.  
In those days, the 8087 was a couple hundred extra dollars, so few 
machines had one.  And the software simulation was horribly slow (on a 
4.7 mhz machine).  So most compilers would have two math libraries.  If 
you wanted 8087 equivalence, and the hardware wasn't there, it was dog 
slow.  On the other hand, if you specified the other math package, it 
didn't benefit at all from the presence of the 8087.




From rhodri at wildebst.demon.co.uk  Sun May 24 17:36:10 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sun, 24 May 2009 22:36:10 +0100
Subject: Can I get a technical explanation on the following error
In-Reply-To: <1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
	<4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>
	<1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
Message-ID: <op.uugeakgia8ncjz@gnudebst>

On Sun, 24 May 2009 21:14:44 +0100, grocery_stocker <cdalten at gmail.com>  
wrote:

> On May 24, 11:47 am, Hans M?ller <heint... at web.de> wrote:
>> Try this:
>>
>> print "\\"
>>
>> \ is the escape character, it masks the meaning of the next chararcter.
>>
>> If you write print "\" python tries to print " (the meaning of " as
>> the string delimiter is beeing masked) and finds no closing "
>> This is why you got the error.
>>
>
> So something like
>
> "\"
>
> changes the meaning of " ? How? Does it just shift the ASCII bit(s)?

No.  There is a fixed set of "escape sequences" as they're called.
The Fine Manual lists them here:

http://docs.python.org/reference/lexical_analysis.html#literals

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From davea at dejaviewphoto.com  Sun May 24 17:54:57 2009
From: davea at dejaviewphoto.com (Dave Angel)
Date: Sun, 24 May 2009 17:54:57 -0400
Subject: Set a variable as in setter
In-Reply-To: <df8b1d7a-c3ba-405a-aeb9-c57f74d552fc@g37g2000yqn.googlegroups.com>
References: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>	<Xns9C1588DDA9E0Eduncanbooth@127.0.0.1>
	<df8b1d7a-c3ba-405a-aeb9-c57f74d552fc@g37g2000yqn.googlegroups.com>
Message-ID: <4A19C231.9050809@dejaviewphoto.com>

Kless wrote:
> On 24 mayo, 12:27, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
>   
>> Kless <jonas.... at googlemail.com> wrote:
>>     
>>> Is there any way to simplify the next code? Because I'm setting a
>>> variable by default of the same way than it's set in the setter.
>>>       
>>> -------------------
>>> class Foo(object):
>>>    def __init__(self, bar):
>>>       self._bar =elf._change(bar)  # !!! as setter
>>>       
>> What's wrong with just doing this?:
>>         self.bar =ar
>>     
>
> Because 'bar' is going to be modified before of be saved.
>
>   
You can't modify bar, it's immutable (string).

Did you try the suggestion, or just assume it won't work?  self.bar will 
call your setter method just as well from __init__() as it does outside 
the class.  So that eliminates the need for a separate _change() method.

class Foo(object):
    def __init__(self, bar):
        self.bar = bar

    @property
    def bar(self):
        return self._bar

    @bar.setter
    def bar(self, text):
        self._bar = text + "any change"



From rhodri at wildebst.demon.co.uk  Sun May 24 17:55:48 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sun, 24 May 2009 22:55:48 +0100
Subject: writing on file not until the end
In-Reply-To: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
Message-ID: <op.uuge7ayqa8ncjz@gnudebst>

On Sun, 24 May 2009 19:46:01 +0100, Alexzive <zasaconsulting at gmail.com>  
wrote:

> Hello,
> I am a newby with python. I wrote the following code to extract a text
> from a file and write it to another file:
>
> linestring = open(path, 'r').read() #read all the inp file in
> linestring
>
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)
>
> unfortunately when I check N.txt some lines are missing (it only crop
> until "57, 0.231749688431, 0.0405121944142" but I espect the final
> line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> all the lines until "242..")
>
> when I try Nfile.write(textN) again it writes some more lines but
> still not all!
> what is wrong whit this?

Cutting and pasting (and substituting the sample file for `path`),
it works for me on Python 2.6.2 (Ubuntu Linux).  It must be something
to do with the context you're calling the code in.  Are you checking
the output before the program has finished running or something?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gregory.matous at gmail.com  Sun May 24 18:01:14 2009
From: gregory.matous at gmail.com (Dutch Masters)
Date: Sun, 24 May 2009 15:01:14 -0700 (PDT)
Subject: How does Python's OOP feel?
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
Message-ID: <cc164551-464d-4994-a722-7ac39e9e9b9d@j18g2000yql.googlegroups.com>

On May 24, 5:54?am, Ikon <vad.vik... at gmail.com> wrote:
Be prepared for a slight wave of depression as you remember all the
pointless interfaces, abstract classes, and getters/setters you
created. I keep reminding myself that Java pays the bills.

Having said that, the dynamic nature of Python lets you experiment
with some more advanced OO concepts that Java doesn't have, like
mixins (like multiple inheritance) and multimethods (dispatching on
parameter types). Then there are metaclasses..



From sjmachin at lexicon.net  Sun May 24 18:07:36 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 24 May 2009 15:07:36 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org> 
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com> 
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com>
Message-ID: <73631ab6-ab2a-4b21-928c-f7690d6e8e00@j18g2000prm.googlegroups.com>

On May 25, 3:09?am, pythoncuri... at gmail.com wrote:
> On May 24, 3:58?pm, John Machin <sjmac... at lexicon.net> wrote:
>
>
>
> > What problems? Like avoiding having to recompile your .py files makes
> > your app run too fast?
>
> There are real problems with this. I'm having similar problems when
> switching
> between Solaris and Windows.
> The code is in clearcase, which uses some sort of network file
> system.
> In our case, that means that I'll be accessing the same directories
> from both
> platforms, so .pyc-files from one platform will be visible when I run
> the
> code on the other platform.

"switching" scarcely seems to be the right description. You appear to
be running the same code from one repository simultaneously available
to two different platforms.

Try this: Instead of running your code straight from your repository,
set up a run-time "launch pad" in an appropriate place for each
platform. When there is a new release of your app, install it in each
launchpad.



>
> The .pyc-file will contain a string pointing to the file is was built
> from.
> The path to that file will be different under different platforms, so
> when the
> string is used, there will be error printouts.
> At least I think that's the problem, the error printouts contains
> paths that
> are only valid on the other platform.
> I don't have access to those computers atm, so I can't show the exact
> message.
>
> The only solution I've seen is to make sure to clean up the .pyc files
> each
> time I switch platform.

I'm a bit lost here ... your clearcase repository uses a mysterious
"some sort of network file system" to which you have access
permissions which allow you to delete individual files??


From davea at ieee.org  Sun May 24 18:08:33 2009
From: davea at ieee.org (Dave Angel)
Date: Sun, 24 May 2009 18:08:33 -0400
Subject: how to get rid of pyc files ?
In-Reply-To: <26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com>
References: <mailman.658.1243170106.8015.python-list@python.org>
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com>
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com>
Message-ID: <4A19C561.40705@ieee.org>

pythoncurious at gmail.com wrote:
> On May 24, 3:58 pm, John Machin <sjmac... at lexicon.net> wrote:
>   
>> What problems? Like avoiding having to recompile your .py files makes
>> your app run too fast?
>>
>>     
>
> There are real problems with this. I'm having similar problems when
> switching
> between Solaris and Windows.
> The code is in clearcase, which uses some sort of network file
> system.
> In our case, that means that I'll be accessing the same directories
> from both
> platforms, so .pyc-files from one platform will be visible when I run
> the
> code on the other platform.
>
> The .pyc-file will contain a string pointing to the file is was built
> from.
> The path to that file will be different under different platforms, so
> when the
> string is used, there will be error printouts.
> At least I think that's the problem, the error printouts contains
> paths that
> are only valid on the other platform.
> I don't have access to those computers atm, so I can't show the exact
> message.
>
> The only solution I've seen is to make sure to clean up the .pyc files
> each
> time I switch platform.
>
>   
Is Clearcase still around?  I hope it works better than it did in 1992.

Somebody else has already pointed out that you can tell Python not to 
create those files (during your development stages).

But if that won't work for some reason, perhaps you can do something 
with symbolic links.  I remember that RCS, for example, required that 
the archives be located in a directory immediately below the one with 
the sources.  So in order to share those archives, you made the 
subdirectory actually a link to a common network location.

Your case would seem to be the opposite.  But I don't know enough about 
the current state of either Solaris or Clearcase to know the best answer.

Perhaps Clearcase supports some form of "exclusion" parameter, wherein 
you say not to do version control on files with certain patterns, like .pyc



From piet at cs.uu.nl  Sun May 24 18:16:19 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Mon, 25 May 2009 00:16:19 +0200
Subject: Need Help
References: <5f238e07-8d39-4bb4-8c6a-cbd56412fb5a@c36g2000yqn.googlegroups.com>
Message-ID: <m2y6sm6tak.fsf@cs.uu.nl>

>>>>> abosalim <mohammed.abosalim at gmail.com> (a) a ?crit:

>a> #Gui
>a> import re, collections
>a> from Tkinter import *
>a> from nltk_lite import tokenize

>a> def words(text): return re.findall('[a-z]+', text.lower())
>a> def train(features):
>a>     model = collections.defaultdict(lambda: 1)
>a>     for f in features:
>a>         model[f] += 1
>a>         return model

The return statement should be shifted left 4 spaces. Now it is inside
the loop instead of after the loop.

By the way, it is better to add python code as attachment instead of
inline text because some news software might fold the lines like in your
posting, making it difficult to reconstruct the code.

...
>a>     def new(self):
>a>         self.string = self.contents.get()
>a> #pass contents of textfield to words()method above
>a>         self.res=  words(self.string)
>a>         self.frame2 = Frame()
>a>         self.frame2.pack()
>a>         self.words = Label(self.frame2, text=self.res, fg="blue", font=
>a> ("Arial", 16))
>a>         self.words.pack()

>a> It print text without correction.I think it didn't enter the method or
>a> any method above the gui.
>a> Please if you have any information,inform me

You don't call correct() or textcorrect() anywhere in your GUI code.
I think instead of self.res=  words(self.string) you should call one of
these. 

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From joanacfcampos at gmail.com  Sun May 24 18:34:42 2009
From: joanacfcampos at gmail.com (Joana)
Date: Sun, 24 May 2009 15:34:42 -0700 (PDT)
Subject: Compile python extensions under windows/cygwin
Message-ID: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>

I mantain Python on Windows, all installed packages are under c:
\Python25\Lib\site-packages. Now I have to build C libraries used by
python extensions and I am using cygwin, but I don't know how to
install the module in Windows directory.

Can anyone help me?

Thanks in advance

Joana


From JKPeck at gmail.com  Sun May 24 18:51:55 2009
From: JKPeck at gmail.com (JKPeck)
Date: Sun, 24 May 2009 15:51:55 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org> 
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com> 
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com> 
	<mailman.681.1243202929.8015.python-list@python.org>
Message-ID: <a98133e8-c5eb-41d1-a0c0-2bc1c6710db2@p6g2000pre.googlegroups.com>

On May 24, 4:08?pm, Dave Angel <da... at ieee.org> wrote:
> pythoncuri... at gmail.com wrote:
> > On May 24, 3:58 pm, John Machin <sjmac... at lexicon.net> wrote:
>
> >> What problems? Like avoiding having to recompile your .py files makes
> >> your app run too fast?
>
> > There are real problems with this. I'm having similar problems when
> > switching
> > between Solaris and Windows.
> > The code is in clearcase, which uses some sort of network file
> > system.
> > In our case, that means that I'll be accessing the same directories
> > from both
> > platforms, so .pyc-files from one platform will be visible when I run
> > the
> > code on the other platform.
>
> > The .pyc-file will contain a string pointing to the file is was built
> > from.
> > The path to that file will be different under different platforms, so
> > when the
> > string is used, there will be error printouts.
> > At least I think that's the problem, the error printouts contains
> > paths that
> > are only valid on the other platform.
> > I don't have access to those computers atm, so I can't show the exact
> > message.
>
> > The only solution I've seen is to make sure to clean up the .pyc files
> > each
> > time I switch platform.
>
> Is Clearcase still around? ?I hope it works better than it did in 1992.
>
> Somebody else has already pointed out that you can tell Python not to
> create those files (during your development stages).
>
> But if that won't work for some reason, perhaps you can do something
> with symbolic links. ?I remember that RCS, for example, required that
> the archives be located in a directory immediately below the one with
> the sources. ?So in order to share those archives, you made the
> subdirectory actually a link to a common network location.
>
> Your case would seem to be the opposite. ?But I don't know enough about
> the current state of either Solaris or Clearcase to know the best answer.
>
> Perhaps Clearcase supports some form of "exclusion" parameter, wherein
> you say not to do version control on files with certain patterns, like .pyc

ClearCase gives you tremendous control over what can be seen at any
point.  Assuming that you are using dynamic views, the simplest way to
fix this is to use a different view for each platform.  They would
both be able to see the py files (although you could control that with
the configspec)as checked in, but the pyc files would not be checked
in and would automatically be view private.  So with two different
views, each platform would only see its own pyc files.

HTH,
Jon Peck


From db3l.net at gmail.com  Sun May 24 18:58:03 2009
From: db3l.net at gmail.com (David Bolen)
Date: Sun, 24 May 2009 18:58:03 -0400
Subject: A fast way to read last line of gzip archive ?
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
Message-ID: <m2y6smm7lw.fsf@valheru.db3l.homeip.net>

"Barak, Ron" <Ron.Barak at lsi.com> writes:

> I thought maybe someone has a way to unzip just the end portion of
> the archive (instead of the whole archive), as only the last part is
> needed for reading the last line.

The problem is that gzip compressed output has no reliable
intermediate break points that you can jump to and just start
decompressing without having worked through the prior data.

In your specific code, using readlines() is probably not ideal as it
will create the full list containing all of the decoded file contents
in memory only to let you pick the last one.  So a small optimization
would be to just iterate through the file (directly or by calling
readline()) until you reach the last line.

However, since you don't care about the bulk of the file, but only
need to work with the final line in Python, this is an activity that
could be handled more efficiently handled with external tools, as you
need not involve much intepreter time to actually decompress/discard
the bulk of the file.

For example, on my system, comparing these two cases:

    # last.py

    import gzip
    import sys

    in_file = gzip.open(sys.argv[1],'r')
    for line in in_file:
        pass
    print 'Last:', line


    # last-popen.py

    import sys
    from subprocess import Popen, PIPE

    # Implement gzip -dc <file> | tail -1
    gzip = Popen(['gzip', '-dc', sys.argv[1]], stdout=PIPE)
    tail = Popen(['tail', '-1'], stdin=gzip.stdout, stdout=PIPE)
    line = tail.communicate()[0]
    print 'Last:', line

with an ~80MB log file compressed to about 8MB resulted in last.py
taking about 26 seconds, while last-popen took about 1.7s.  Both
resulted in the same value in "line".  As long as you have local
binaries for gzip/tail (such as Cygwin or MingW or equivalent) this
works fine on Windows systems too.

If you really want to keep everything in Python, then I'd suggest
working to optimize the "skip" portion of the task, trying to
decompress the bulk of the file as quickly as possible.  For example,
one possibility would be something like:

    # last-chunk.py
    
    import gzip
    import sys
    from cStringIO import StringIO

    in_file = gzip.open(sys.argv[1],'r')

    chunks = ['', '']
    while 1:
        chunk = in_file.read(1024*1024)
        if not chunk:
            break
        del chunks[0]
        chunks.append(chunk)

    data = StringIO(''.join(chunks))
    for line in data:
        pass
    print 'Last:', line

with the idea that you decode about a MB at a time, holding onto the
final two chunks (in case the actual final chunk turns out to be
smaller than one of your lines), and then only process those for
lines.  There's probably some room for tweaking the mechanism for
holding onto just the last two chunks, but I'm not sure it will make
a major difference in performance.

In the same environment of mine as the earlier tests, the above took
about 2.7s.  So still much slower than the external utilities in
percentage terms, but in absolute terms, a second or so may not be
critical for you compared to pure Python.

-- David


From lists at cheimes.de  Sun May 24 19:13:53 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 25 May 2009 01:13:53 +0200
Subject: Compile python extensions under windows/cygwin
In-Reply-To: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
References: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
Message-ID: <gvckbh$tku$1@ger.gmane.org>

Joana wrote:
> I mantain Python on Windows, all installed packages are under c:
> \Python25\Lib\site-packages. Now I have to build C libraries used by
> python extensions and I am using cygwin, but I don't know how to
> install the module in Windows directory.

Are you sure you want to use Cygwin? Binaries build with and for Cygwin
are not compatible with ordinary Windows binaries. I assume that you
want to build C extensions with the open source MinGW32 compiler? That's
easy:

* Install MinGW32
* Add its bin directory to PATH
* Add a file distutils.cfg in C:\Python25\Lib\distutils with
  this content:

[build]
compiler=mingw32


* Have fun :)

Christian



From vladimir at acm.org  Sun May 24 19:19:57 2009
From: vladimir at acm.org (Vladimir G. Ivanovic)
Date: Sun, 24 May 2009 16:19:57 -0700
Subject: Searching for pyvm
Message-ID: <4A19D61D.6020409@acm.org>

Hello,

I'm looking for the sources to pyvm, a python virtual machine
implementation which can run Python 2.4 bytecode.

If someone could point me in the right direction, I would appreciate it.

Thanks.

--- Vladimir

P.S. The link on the author's pyvm page is broken, and I have been
unable to find a copy elsewhere (Google, FTP servers, All-the-Web
search, etc.)

-- 
Vladimir G. Ivanovic



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From david.lyon at preisshare.net  Sun May 24 19:21:21 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Sun, 24 May 2009 19:21:21 -0400
Subject: how to get rid of pyc files =?UTF-8?Q?=3F?=
In-Reply-To: <4A19453F.5050204@gmail.com>
References: <4A19453F.5050204@gmail.com>
Message-ID: <1896a3d353dddf82ee02bbb17e5fcf52@preisshare.net>

On Sun, 24 May 2009 15:01:51 +0200, Stef Mientki <stef.mientki at gmail.com>
wrote:
> hello,
> 
> Moving my entire program section between windows and Ubuntu,
> sometimes causes problems, due to the existence of pyc-files
> (and probably because my program still has hard coded paths).
> 
> Is there a way to prevent generating pyc-files ?
> Or is there a way to redirect the generated pyc-files to a dedicated 
> location ?

Yes.. I see your problem...

try something else.... linking the files in linux...

Try this:

 - create a windows "run-directory" as in 'mkdir win-run'

 - create symbolic link in the win-run directory for each script
    
    - 'cd win-run'

    - 'ln -s /home/user/mypythondir/hello.py hello.py'

    - for every source file...


Now you'll be able to run both...

Under windows the .pyc files will be created in the
win-run directory and under linux in /home/user/mypythondir

David



From joanacfcampos at gmail.com  Sun May 24 19:32:57 2009
From: joanacfcampos at gmail.com (Joana)
Date: Sun, 24 May 2009 16:32:57 -0700 (PDT)
Subject: Compile python extensions under windows/cygwin
References: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
	<mailman.682.1243206845.8015.python-list@python.org>
Message-ID: <918cfe57-563d-4bd9-a93c-aa0cec233ac2@j18g2000yql.googlegroups.com>

On 25 Maio, 00:13, Christian Heimes <li... at cheimes.de> wrote:
> Joana wrote:
> > I mantain Python on Windows, all installed packages are under c:
> > \Python25\Lib\site-packages. Now I have to build C libraries used by
> > python extensions and I am using cygwin, but I don't know how to
> > install the module in Windows directory.
>
> Are you sure you want to use Cygwin? Binaries build with and for Cygwin
> are not compatible with ordinary Windows binaries. I assume that you
> want to build C extensions with the open source MinGW32 compiler? That's
> easy:
>
> * Install MinGW32
> * Add its bin directory to PATH
> * Add a file distutils.cfg in C:\Python25\Lib\distutils with
> ? this content:
>
> [build]
> compiler=mingw32
>
> * Have fun :)
>
> Christian

hmm.. but the problem with mingw32 is that it does not have the
libraries I need. The module I want to install includes netinet/in.h.
So the answer is that I can't install that module in Windows?


From david.lyon at preisshare.net  Sun May 24 19:42:01 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Sun, 24 May 2009 19:42:01 -0400
Subject: Compile python extensions under windows/cygwin
In-Reply-To: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
References: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
Message-ID: <a1512dd6d680d556cfbbda6b1a021b7c@preisshare.net>

On Sun, 24 May 2009 15:34:42 -0700 (PDT), Joana <joanacfcampos at gmail.com>
wrote:
> I mantain Python on Windows, all installed packages are under c:
> \Python25\Lib\site-packages. Now I have to build C libraries used by
> python extensions and I am using cygwin, but I don't know how to
> install the module in Windows directory.
> 
> Can anyone help me?

I think it is a problem because as far as I know cygwin cannot
see files outside of /cygwin. 

Where is python installed in cygwin?

Can't you install the same packages into cygwin?

and then do your building in there...?

David


From davea at ieee.org  Sun May 24 19:46:28 2009
From: davea at ieee.org (Dave Angel)
Date: Sun, 24 May 2009 19:46:28 -0400
Subject: writing on file not until the end
In-Reply-To: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
Message-ID: <4A19DC54.6010601@ieee.org>

Alexzive wrote:
> Hello,
> I am a newby with python. I wrote the following code to extract a text
> from a file and write it to another file:
>
> linestring = open(path, 'r').read() #read all the inp file in
> linestring
>
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)
>
> unfortunately when I check N.txt some lines are missing (it only crop
> until "57, 0.231749688431, 0.0405121944142" but I espect the final
> line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> all the lines until "242..")
>
> when I try Nfile.write(textN) again it writes some more lines but
> still not all!
> what is wrong whit this?
>
> Many thanks for your help!
> Alex
>
> the original file to crop (in path) looks like this:
>
> <snip>
>
>
>   
Is there a reason you used e-1 instead of e in the slice?  That's going 
to chop off the last newline.  And in some (broken) text viewers, you 
might not see the partial line.  Also, it'll behave a bit different in 
Windows than in one of the Unix variants, due to newline being 
represented by two characters instead of one.

e=linestring.index("*",i+10)
textN = linestring[i+2:e-1] # crop the ELement+nodes list




From matt at tplus1.com  Sun May 24 19:46:31 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Sun, 24 May 2009 23:46:31 GMT
Subject: I need help building a data structure for a state diagram
References: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>
	<89cbdfa9-2107-47c3-900c-ac0b574614a3@r37g2000yqd.googlegroups.com>
Message-ID: <r%kSl.30872$YU2.3253@nlpi066.nbdc.sbc.com>

On Sun 24 May 2009 03:42:01 PM EDT, Kay Schluehr wrote:
>
> General answer: you can encode finite state machines as grammars.
> States as non-terminals and transition labels as terminals:
>
> UNSTARTED: 'start' STARTED
> STARTED: 'ok' FINISHED | 'cancel' ABANDONED
> ABANDONED: 'done'
> FINISHED: 'done'
>
> In some sense each state-machine is also a little language.


I've never formally studied grammars, but I've worked through trivial
stuff that uses BNF to express ideas like 

    <postal-address> ::= <name-part> <street-address> <zip-part>

I don't really understand how to apply that notion to this statement:

    UNSTARTED: 'start' STARTED

That doesn't seem to be BNF, and that's all I know about grammar stuff.

Can you explain a little more?  This idea of using grammars for my
workflow sounds *really* fun and I'd love to learn this stuff, but I
could benefit from some more explanation.


Matt


From matt at tplus1.com  Sun May 24 19:51:09 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Sun, 24 May 2009 23:51:09 GMT
Subject: How can I get access to the function called as a property?
Message-ID: <N3lSl.30873$YU2.7989@nlpi066.nbdc.sbc.com>

I use a @property decorator to turn some methods on a class into
properties.  I want to be able to access some of the attributes of the
original funtion, but I don't know how to get to it.

Any ideas?

Matt


From davea at ieee.org  Sun May 24 19:51:42 2009
From: davea at ieee.org (Dave Angel)
Date: Sun, 24 May 2009 19:51:42 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <gvc6np$plr$1@ger.gmane.org>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.535.1242945935.8015.python-list@python.org>	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>	<gvb8kn$7gm$2@lust.ihug.co.nz>
	<gvc6np$plr$1@ger.gmane.org>
Message-ID: <4A19DD8E.6020207@ieee.org>



Dennis Lee Bieber wrote:
> On Sun, 24 May 2009 22:47:51 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
>
>
>   
>> As for exactitude in physics, Gregory Chaitin among others has been trying 
>> to rework physics to get rid of real numbers altogether.
>>     
>
> 	By decreeing that the value of PI is 3?
>   
Only in Ohio.



From max at alcyone.com  Sun May 24 19:59:57 2009
From: max at alcyone.com (Erik Max Francis)
Date: Sun, 24 May 2009 16:59:57 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <gvas9k$vvf$1@lust.ihug.co.nz>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<gvas9k$vvf$1@lust.ihug.co.nz>
Message-ID: <9MWdnTfMPPrjQoTXnZ2dnUVZ_vadnZ2d@giganews.com>

Lawrence D'Oliveiro wrote:
> In message <mailman.525.1242941777.8015.python-list at python.org>, Christian 
> Heimes wrote:
> 
>> Welcome to IEEE 754 floating point land! :)
> 
> It used to be worse in the days before IEEE 754 became widespread. Anybody 
> remember a certain Prof William Kahan from Berkeley, and the foreword he 
> wrote to the Apple Numerics Manual, 2nd Edition, published in 1988? It's 
> such a classic piece that I think it should be posted somewhere...

I only see used versions of it available for purchase.  Care to hum a 
few bars?

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM, Y!M, Skype erikmaxfrancis
   I get my kicks above the wasteline, sunshine
    -- The American, _Chess_


From lists at cheimes.de  Sun May 24 20:54:57 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 25 May 2009 02:54:57 +0200
Subject: Compile python extensions under windows/cygwin
In-Reply-To: <918cfe57-563d-4bd9-a93c-aa0cec233ac2@j18g2000yql.googlegroups.com>
References: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>	<mailman.682.1243206845.8015.python-list@python.org>
	<918cfe57-563d-4bd9-a93c-aa0cec233ac2@j18g2000yql.googlegroups.com>
Message-ID: <gvcq91$8fv$1@ger.gmane.org>

Joana wrote
> hmm.. but the problem with mingw32 is that it does not have the
> libraries I need. The module I want to install includes netinet/in.h.
> So the answer is that I can't install that module in Windows?

What's the name of the package? Perhaps it doesn't work on Windows. Or
it hasn't been ported to Windows yet. On Windows most definition are in
the files winsock.h and winsock2.h rather than in netinet/*.h.

Christian



From tjreedy at udel.edu  Sun May 24 21:14:30 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 24 May 2009 21:14:30 -0400
Subject: how to get rid of pyc files ?
In-Reply-To: <4A19453F.5050204@gmail.com>
References: <4A19453F.5050204@gmail.com>
Message-ID: <gvcrdk$9dk$1@ger.gmane.org>

Stef Mientki wrote:

> btw, What commandline switches are available for python ?

The set of documents on the site and at least on Windows comes with
Using Python.  First chapter: Command Line ....



From ldo at geek-central.gen.new_zealand  Sun May 24 21:39:02 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 25 May 2009 13:39:02 +1200
Subject: About Standard Numerics (was Re: 4 hundred quadrillonth?)
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<gvas9k$vvf$1@lust.ihug.co.nz>
	<9MWdnTfMPPrjQoTXnZ2dnUVZ_vadnZ2d@giganews.com>
Message-ID: <gvcsrm$677$1@lust.ihug.co.nz>

In message <9MWdnTfMPPrjQoTXnZ2dnUVZ_vadnZ2d at giganews.com>, Erik Max Francis 
wrote:

> Lawrence D'Oliveiro wrote:
>
>> In message <mailman.525.1242941777.8015.python-list at python.org>,
>> Christian Heimes wrote:
>> 
>>> Welcome to IEEE 754 floating point land! :)
>> 
>> It used to be worse in the days before IEEE 754 became widespread.
>> Anybody remember a certain Prof William Kahan from Berkeley, and the
>> foreword he wrote to the Apple Numerics Manual, 2nd Edition, published in
>> 1988? It's such a classic piece that I think it should be posted
>> somewhere...
> 
> I only see used versions of it available for purchase.  Care to hum a
> few bars?

Part I of this book is mainly for people who perform scientific, 
statistical, or engineering computations on Apple? computers. The rest is 
mainly for producers of software, especially of language processors, that 
people will use on Apple computers to perform computations in those fields 
and in finance and business too. Moreover, if the first edition was any 
indication, people who have nothing to do with Apple computers may well buy 
this book just to learn a little about an arcane subject, floating-point 
arithmetic on computers, and will wish they had an Apple.

Computer arithmetic has two properties that add to its mystery:

* What you see is often not what you get, and
* What you get is sometimes not what you wanted.

Floating-point arithmetic, the kind computers use for protracted work with 
approximate data, is intrinsically approximate because the alternative, 
exact arithmetic, could take longer than most people are willing to wait--
perhaps forever. Approximate results are customarily displayed or printed to 
show only as many of their leading digits as matter instead of all digits; 
what you see need not be exactly what you've got. To complicate matters, 
whatever digits you see are /decimal/ digits, the kind you saw first in 
school and the kind used in hand-held calculators. Nowadays almost no 
computers perform their arithmetic with decimal digits; most of them use 
/binary/, which is mathematically better than decimal where they differ, but 
different nonetheless. So, unless you have a small integer, what you see is 
rarely just what you have.

In the mid 1960's, computer architects discovered shortcuts that made 
arithmetic run faster at the cost of what they reckoned to be a slight 
increase in the level of rounding error; they thought you could not object 
to slight alterations in the rightmost digits of numbers since you could not 
see those digits anyway. They had the best intentions, but they accomplished 
the opposite of what they intended. Computer throughputs were not improved 
perceptibly by those shortcuts, but a few programs that had previously been 
trusted unreservedly turned treacherous, failing in mysterious ways on 
extremely rare occasions.

For instance, a very Important Bunch of Machines launched in 1964 were found 
to have two anomalies in their double-precision arithmetic (though not in 
single): First, multiplying a number /Z/ by 1.0 would lop off /Z/'s last 
digit. Second, the difference between two nearly equal numbers, whose digits 
mostly canceled, could be computed wrong by a factor almost as big as 16 
instead of being computed exactly as is normal. The anomalies introduced a 
kind of noise in the feedback loops by which some programs had compensated 
for their own rounding errors, so those programs lost their high accuracies. 
These anomalies were not "bugs"; they were "features" designed into the 
arithmetic by designers who thought nobody would care. Customers did care; 
the arithmetic was redesigned and repairs were retrofitted in 1967.

Not all Capriciously Designed Computer arithmetics have been repaired. One 
family of computers has enjoyed notoriety for two decades by allowing 
programs to generate tiny "partially underflowed" numbers. When one of these 
creatures turns up as the value of /T/ in an otherwise innocuous statement 
like

if T = 0.0 then Q := 0.0 else Q := 702345.6 / (T + 0.00189 / T);

it causes the computer to stop execution and emit a message alleging 
"Division by Zero". The machine's schizophrenic attitude toward zero comes 
about because the test for T = 0.0 is carried out by the adder, which 
examines at least 13 of /T/'s leading digits, whereas the divider and 
multiplier examine only 12 to recognize zero. Doing so saved less than a 
dollar's worth of transistors and maybe a picosecond of time, but at the 
cost of some disagreement about whether a very tiny number /T/ is zero or 
not. Fortunately, the divider agrees with the multiplier about whether /T/ 
is zero, so programmers could prevent spurious divisions by zero by slightly 
altering the foregoing statement as follows:

if 1.0 * T = 0.0 then Q := 0.0 else Q := 702345.6 / (T + 0.00189 / T);

Unfortunately, the Same Computer designer responsible for "partial 
underflow" designed another machine that can generate "partially 
underflowed" numbers /T/ for which this statement malfunctions. On that 
machine, /Q/ would be computed unexceptionably except that the product 1.0 * 
T causes the machine to stop and emit a message alleging "Overflow". How 
should a programmer rewrite that innocuous statement so that it will work 
correctly on both machines? We should be thankful that such a task is not 
encountered every day.

Anomalies related to roundoff are extremely difficult to diagnose. For 
instance, the machine on which 1.0 * T can overflow also divides in a 
peculiar way that causes quotients like 240.0 / 80.0, which ought to produce 
small integers, sometimes to produce nonintegers instead, sometimes slightly 
too big, sometimes slightly too small. The same machine multiplies in a 
peculiar way, and it subtracts in a peculiar way that can get the difference 
wrong by almost a factor of 2 when it ought to be exact because of 
cancellation.

Another peculiar kind of subtraction, but different, afflicts the machines 
that are schizophrenic about zero. Sets of three values /X/, /Y/ and /Z/ 
abound for which the statement

if (X = Y) and ((X - Z) > (Y - Z)) then writeln('Strange!');

will print "Strange!" on those machines. And many machines will print 
"Strange!" for unlucky values /X/ and /Y/ in the statement

if (X - Y = 0.0) and (X > Y) then writeln('Strange!');

because of underflow.

/These strange things cannot happen on current Apple computers./

I do not wish to suggest that all but Apple computers have had quirky 
arithmetics. A few other computer companies, some Highly Prestigious, have 
Demonstrated Exemplary Concern for arithmetic integrity over many years. Had 
their concern been shared more widely, numerical computation would now be 
easier to understand. Instead, because so many computers in the 1960's and 
1970's possessed so many different arithmetic anomalies, computational lore 
has become encumbered with a vast body of superstition purporting to cope 
with them. One such superstitious rule is "/Never/ ask whether floating-
point numbers are exactly equal".

Presumably the reasonable thing to do instead is to ask whether the numbers 
differ by less than some tolerance; and this /is/ truly reasonable provided 
you know what tolerance to choose. But the word /never/ is what turns the 
rule from reasonable into mere superstition. Even if every floating-point 
comparison in your program involved a tolerance, you would wish to predict 
which path execution would follow from various input data, and whether the 
different comparisons were mutually consistent. For instance, the predicates 
X < Y - TOL and Y - TOL > X seem equivalent to the naked eye, but computers 
exist (/not/ made by Apple!) on which one can be true and the other false 
for certain values of the variables. To ask "Which?" violates the 
superstitious rule.

There have been several attempts to avoid superstition by devising 
mathematical rules called /axioms/ that would be valid for all commercially 
significant computers and from which a programmer might hope to be able to 
deduce whether his program will function correctly on all those computers. 
Unfortunately, such attempts cannot succeed without failing! The paradox 
arises because any such rules, to be valid universally, have to encompass so 
wide a range of anomalies as to constitute the specifications for a 
hypothetical computer far worse arithmetically than any ever actually built. 
In consequence, many computations provably impossible on that hypothetical 
computer would be quite feasible on almost every actual computer. For 
instance, the axioms must imply limits to the accuracy with which 
differential equations can be solved, integrals evaluated, infinite series 
summed, and areas of triangles calculated; but these limits are routinely 
surpassed nowadays by programs that run on most commercially significant 
computers, although some computers may require programs that are so special 
that they would be useless on any other machine.

Arithmetic anarchy is where we seemed headed until a decade ago when work 
began upon IEEE Standard 754 for binary floating-point arithmetic. Apple's 
mathematicians and engineers helped from the very beginning. The resulting 
family of coherent designs for computer arithmetic has been adopted more 
widely, and by more computer manufacturers, than any other single design. 
Besides the undoubted benefits that flow from any standard, the principal  
benefit derived from the IEEE standard in particular is this:

/Program importability:/ Almost any application of floating-point 
arithmetic, designed to work on a few different families of computers in 
existence before the IEEE Standard and programmed in a higher-level 
language, will, after recompilation, work at least about as well on an Apple 
computer or on any other machine that conforms to IEEE Standard 754 as on 
any nonconforming computer with comparable capacity (memory, speed, and word 
size).

The Standard Apple Numerics Environment (SANE) is the most thorough 
implementation of IEEE Standard 754 to date. The fanatical attention to 
detail that permeates SANE's implementation largely relieves Apple computer 
users from having to know any more about those details than they like. If 
you come to an Apple computer from some other computer that you were fond 
of, you will find the Apple computer's arithmetic at least about as good, 
and quite likely rather better. An Apple computer can be set up to mimic the 
worthwhile characteristics of almost any reasonable past computer 
arithmetic, so existing libraries of numerical software do not have to be 
discarded if they can be recompiled. SANE also offers features that are 
unique to the IEEE Standard, new capabilities that previous generations of 
computer users could only yearn for; but to learn what they are, you will 
have to read this book.

As one of the designers of IEEE Standard 754, I can only stand in awe of the 
efforts that Apple has expended to implement that standard faithfully both 
in hardware and in software, including language processors, so that users of 
Apple computers will actually reap tangible benefits from the Standard. And 
I thank Apple for letting me explain in this foreword why we needed that 
standard.

                                Professor W. Kahan
                                Mathematics Department and
                                Electrical Engineering and
                                Computer Science Department
                                University of California at Berkeley
                                December 16, 1987




From benjamin at python.org  Sun May 24 22:07:58 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Mon, 25 May 2009 02:07:58 +0000 (UTC)
Subject: How can I get access to the function called as a property?
References: <N3lSl.30873$YU2.7989@nlpi066.nbdc.sbc.com>
Message-ID: <loom.20090525T020650-873@post.gmane.org>

Matthew Wilson <matt <at> tplus1.com> writes:

> 
> I use a @property decorator to turn some methods on a class into
> properties.  I want to be able to access some of the attributes of the
> original funtion, but I don't know how to get to it.

my_class.__dict__["some_property].(fget|fdel|fset)





From lists at cheimes.de  Sun May 24 22:08:41 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 25 May 2009 04:08:41 +0200
Subject: How can I get access to the function called as a property?
In-Reply-To: <N3lSl.30873$YU2.7989@nlpi066.nbdc.sbc.com>
References: <N3lSl.30873$YU2.7989@nlpi066.nbdc.sbc.com>
Message-ID: <gvcuj9$f7q$1@ger.gmane.org>

Matthew Wilson schrieb:
> I use a @property decorator to turn some methods on a class into
> properties.  I want to be able to access some of the attributes of the
> original funtion, but I don't know how to get to it.
> 
> Any ideas?

Here you are:

>>> class Example(object):
...     @property
...     def func(self):
...         pass
...
>>> Example.func.fget
<function func at 0x7fc8d3129938>
>>> example = Example()
>>> example.__class__.func
<property object at 0x7fc8d31309f0>
>>> example.__class__.func.fget
<function func at 0x7fc8d3129938>



From dyamins at gmail.com  Sun May 24 22:32:46 2009
From: dyamins at gmail.com (Dan Yamins)
Date: Sun, 24 May 2009 22:32:46 -0400
Subject: Python -> R?
In-Reply-To: <gv90n1$1h4$1@ger.gmane.org>
References: <gv90n1$1h4$1@ger.gmane.org>
Message-ID: <15e4667e0905241932p2a47b08aj9dc79aaeadf32078@mail.gmail.com>

>
> If so, what are you using? I have read about RPy, is that a good
> solution?



Yes, I think it's quite a good solution.  It's not exactly 100% as
convenient as working directly in R, but that's IMO more than compensated by
the ability to use Python's syntax.

Make sure you use Rpy2 (the successor to Rpy) -- I find it significantly
better.   However, the online documentation is in IMHO a little thin -- at
least, in terms of examples -- so I once wrote up a little 5-minute tutorial
to show a friend how to use Rpy2.  I've attached it to this message -- you
may find it useful.

best
Dan
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From steven at REMOVE.THIS.cybersource.com.au  Sun May 24 22:39:37 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 25 May 2009 02:39:37 GMT
Subject: Need Help
References: <5f238e07-8d39-4bb4-8c6a-cbd56412fb5a@c36g2000yqn.googlegroups.com>
	<m2y6sm6tak.fsf@cs.uu.nl>
Message-ID: <pan.2009.05.25.02.39.37@REMOVE.THIS.cybersource.com.au>

On Mon, 25 May 2009 00:16:19 +0200, Piet van Oostrum wrote:

> By the way, it is better to add python code as attachment instead of
> inline text because some news software might fold the lines like in your
> posting, making it difficult to reconstruct the code.

Except that some news software might not show the attachment at all.

-- 
Steven


From timr at probo.com  Sun May 24 22:44:07 2009
From: timr at probo.com (Tim Roberts)
Date: Sun, 24 May 2009 19:44:07 -0700
Subject: making a python program in windows
References: <mailman.488.1242897741.8015.python-list@python.org>
	<l-OdnQ3QTPFTt4jXnZ2dnUVZ8tJi4p2d@bt.com>
	<c361a5d5-e63a-4117-8c55-21ae31245ff2@b6g2000pre.googlegroups.com>
	<Xns9C1284B6480C9duncanbooth@127.0.0.1>
	<7530b645-d6dc-483a-94ed-0dfbe9331ee2@d7g2000prl.googlegroups.com>
Message-ID: <qe1k151n82v796875lt1g6c3cd14fq9026@4ax.com>

rustom <rustompmody at gmail.com> wrote:
>
>Thanks for this (and all other) tips.
>Strangely now my m/c shows things exactly like so. A new .py file gets
>associated with python but two days ago it was with pythonw?!

No, .py files are always associated with python.exe.  .pyw files are
associated with pythonw.exe.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From steven at REMOVE.THIS.cybersource.com.au  Sun May 24 22:45:10 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 25 May 2009 02:45:10 GMT
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org>
Message-ID: <pan.2009.05.25.02.45.10@REMOVE.THIS.cybersource.com.au>

On Sun, 24 May 2009 15:01:51 +0200, Stef Mientki wrote:

> Is there a way to prevent generating pyc-files ? 

Put the .py files in a read-only directory.


> Or is there a way to
> redirect the generated pyc-files to a dedicated location ?

No.


> btw, What commandline switches are available for python ? (googling
> didn't give me any relevant hits )

python --help


at the shell (not Python) prompt.



-- 
Steven


From ldo at geek-central.gen.new_zealand  Sun May 24 22:59:24 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 25 May 2009 14:59:24 +1200
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
Message-ID: <gvd1id$8jj$2@lust.ihug.co.nz>

In message <roy-3C4DED.09214724052009 at news.panix.com>, Roy Smith wrote:

> In article <gvb8fn$7gm$1 at lust.ihug.co.nz>,
>  Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
> 
>> The right thing to do is try to ensure that all your connections are
>> properly closed at shutdown. That may not be enough (if your server
>> crashes due to bugs), so the other thing you need to do is retry the
>> socket open, say, at 30-second intervals, until it succeeds.
> 
> That may be a reasonable thing to do for production code, but when you're
> building and debugging a server, it's a real pain to not be able to
> restart it quickly whenever you want (or need) to.

On the contrary, I run exactly the same logic--and that includes socket-
handling logic--in both test and production servers. How else can I be sure 
it'll work properly in production?



From drobinow at gmail.com  Sun May 24 23:19:35 2009
From: drobinow at gmail.com (David Robinow)
Date: Sun, 24 May 2009 23:19:35 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <4A19DD8E.6020207@ieee.org>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
	<gvb8kn$7gm$2@lust.ihug.co.nz> <gvc6np$plr$1@ger.gmane.org>
	<4A19DD8E.6020207@ieee.org>
Message-ID: <4eb0089f0905242019l39dad925wc214698bb067e58e@mail.gmail.com>

On Sun, May 24, 2009 at 7:51 PM, Dave Angel <davea at ieee.org> wrote:
>> ? ? ? ?By decreeing that the value of PI is 3?
>>
>
> Only in Ohio.
Please, we're smarter than that in Ohio. In fact, while the Indiana
legislature was learning about PI, we had guys inventing the airplane.

http://en.wikipedia.org/wiki/Indiana_Pi_Bill


From jhg at acm.org  Sun May 24 23:29:50 2009
From: jhg at acm.org (Jim Garrison)
Date: Sun, 24 May 2009 22:29:50 -0500
Subject: Can I get a technical explanation on the following error
In-Reply-To: <mailman.679.1243200974.8015.python-list@python.org>
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>	<4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>	<1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
	<mailman.679.1243200974.8015.python-list@python.org>
Message-ID: <4a1a1084$0$19026$4c5ecfc7@fe1.usenet.com>

And as an interesting exercise, try

print r'test \'
print r'test \\'

Because of the way raw string parsing is defined, neither of these will
pass the parser.  In fact, a raw string cannot have a backslash as
its last character.


From ldo at geek-central.gen.new_zealand  Mon May 25 00:21:19 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 25 May 2009 16:21:19 +1200
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
	<gvb8kn$7gm$2@lust.ihug.co.nz>
	<mailman.674.1243192904.8015.python-list@python.org>
Message-ID: <gvd6c0$bqs$1@lust.ihug.co.nz>

In message <mailman.674.1243192904.8015.python-list at python.org>, Dennis Lee 
Bieber wrote:

> On Sun, 24 May 2009 22:47:51 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
> 
>> As for exactitude in physics, Gregory Chaitin among others has been
>> trying to rework physics to get rid of real numbers altogether.
> 
> By decreeing that the value of PI is 3?

Interesting kind of mindset, that assumes that the opposite of "real" must 
be "integer" or a subset thereof...



From brendan.johnston at gmail.com  Mon May 25 00:28:15 2009
From: brendan.johnston at gmail.com (brendan.johnston at gmail.com)
Date: Sun, 24 May 2009 21:28:15 -0700 (PDT)
Subject: Compile python extensions under windows/cygwin
References: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
	<mailman.685.1243208719.8015.python-list@python.org>
Message-ID: <64d2e7e9-38ef-4d0d-977f-13ef4fe23cc1@y6g2000prf.googlegroups.com>

On May 25, 9:42?am, David Lyon <david.l... at preisshare.net> wrote:
> On Sun, 24 May 2009 15:34:42 -0700 (PDT), Joana <joanacfcam... at gmail.com>
> wrote:
>
> > I mantain Python on Windows, all installed packages are under c:
> > \Python25\Lib\site-packages. Now I have to build C libraries used by
> > python extensions and I am using cygwin, but I don't know how to
> > install the module in Windows directory.
>
> > Can anyone help me?
>
> I think it is a problem because as far as I know cygwin cannot
> see files outside of /cygwin.
>
> Where is python installed in cygwin?
>
> Can't you install the same packages into cygwin?
>
> and then do your building in there...?
>
> David

I think I don't understand this comment.

All the drives on my windows machine are visible using the scheme:

/cygdrive/<drivename>/<path>/<to>/<file>

For example:

bash-3.2$ ls -l /cygdrive/c/windows/system32/drivers/etc/hosts
-rwx------+ 1 johnbre mkgroup-l-d 820 Nov  8  2008 /cygdrive/c/windows/
system32/drivers/etc/hosts
bash-3.2$

and you can mount things in cygwin as you choose:

http://www.cygwin.com/cygwin-ug-net/using.html#mount-table

The answer to the problem of compiling python packages was:

 * Download Visual C++ 2008 Express for free from Microsoft.
 * Find it was incompatible with compiling packages for my Python 2.5
(Visual Studio 2003).
 * Move to Python 2.6.
 * Problem solved, things compiled and worked




From Eric_Dexter at msn.com  Mon May 25 01:13:34 2009
From: Eric_Dexter at msn.com (edexter)
Date: Sun, 24 May 2009 22:13:34 -0700 (PDT)
Subject: PureData py/pyExt into standalone python
References: <a3e7e823-2872-4a49-9d04-82058638aff3@z7g2000vbh.googlegroups.com>
Message-ID: <8f3291a1-8aa4-4313-acec-2b207fdc96d2@y10g2000prc.googlegroups.com>

On May 23, 6:49?am, responsib... at gmail.com wrote:
> Hi guys,
>
> Short version:
>
> I've written some python classes for py/pyExt extensions for the
> "dataflow" graphical programming environment PureData. Here's an
> example PureData screenshot for clarity:
>
> ? ? ? ? see:http://i40.tinypic.com/2rrx6gy.jpg
>
> My classes talk to eachother via the PureData system, and they talk to
> the outside world via pyPortMIDI (which enables raw MIDI data
> communication).
>
> PureData encourages modularisation, so I've written several classes:
> * some that receive raw MIDI data,
> * some that parse this into human-readable tokens,
> * some that just generate human-readable tokens,
> * and some that parse human-readable tokens then send raw MIDI data
>
> I want to join these together as a stand-alone python application,
> using internal python communication instead of PureData...
>
> ...but I don't know how to do this. The only python I know comes from
> writing using the pyExt API, and the PureData API (which is written in
> C).
>
> ----
> Long(er) version:
>
> Miller Pukette's PureData:http://puredata.info/
> Thomas Grill's Flext:http://puredata.info/Members/thomas/flext
> Thomas Grill's Py/Pyext:http://puredata.info/Members/thomas/py/
> John Harrison's PyPortMIDI:http://www.media.mit.edu/~harrison/code.html
> CMU's PortMIDI:http://www.cs.cmu.edu/~music/portmusic/
>
> PureData is a graphical "dataflow" programming environment that (among
> many, many other things!) allows for very rapid development of Audio
> and MIDI processing. Objects in PureData (and MaxMSP) communicate by
> sending messages through "patch cords" that connect an "outlet" to an
> "inlet" of another object.
>
> Thomas Grill's py/pyExt allows python code to be embedded as a
> PureData object. The benefit being that this python code can be
> effortlessly ported across multiple platforms (win32/linux/osx) and
> also to the highly related (but more commercial) Cycling'74 MaxMSP
> system. (PureData object code is written in C and generally not easy
> to port between platforms, nor between PD and MaxMSP - so writing
> portable python objects is a boon!)
>
> a pyExt object sends messages from its outlets using the line:
>
> ? ? ? ? self._outlet(outlet_id,message_to_send)
>
> a pyExt object performs actions when a message arrives at an inlet. An
> integer arriving at inlet 1 could be attached to this method code:
>
> ? ? ? ? def int_1(self,*arg):
> ? ? ? ? ? ? ? ? print "received integer:",arg[0]
>
> If these pieces of code were in separate python classes - how would I
> connect two objects together such that an integer was passed between
> the two?
>
> If the first object sent 42, in puredata it would look like this:
>
> http://i44.tinypic.com/15eh74p.gif
>
> useless fact: the screenshot doubles up (i.e. "pyext sender sender")
> due to the first word being the python file (i.e. sender.py), whilst
> the second is the name of the object class (i.e class sender
> (pyext._class)
>
> ----
> Maybe a more tricky question is:
>
> PureData supports "message busses" - messages sent to named busses can
> be broadcast to multiple locations. How would I connect objects up in
> this way using python?
>
> a pyExt object registers to receive messages on a certain bus using:
>
> ? ? ? ? self._bind(bus_name,self.method_to_call)
>
> ? ? ? ? def method_to_call(self,*arg):
> ? ? ? ? ? ? ? ? print "a message on", bus_name, "arrived"
> ? ? ? ? ? ? ? ? print "the message was", len(arg), "long"
> ? ? ? ? ? ? ? ? print "and had the values", arg, "inside"
>
> a pyExt object sends messages to a particular bus by using:
>
> ? ? ? ? self._send(bus_name,message_to_send)

* some that parse this into human-readable tokens,
* some that just generate human-readable tokens,


This might be usefull do you intend to release this code??
There are some midi libraries that may be helpful, it is hard to tell
what you need without seeing the code


From steven at REMOVE.THIS.cybersource.com.au  Mon May 25 01:22:15 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 25 May 2009 05:22:15 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
	<gvb8kn$7gm$2@lust.ihug.co.nz>
	<mailman.674.1243192904.8015.python-list@python.org>
	<gvd6c0$bqs$1@lust.ihug.co.nz>
Message-ID: <pan.2009.05.25.05.22.14@REMOVE.THIS.cybersource.com.au>

On Mon, 25 May 2009 16:21:19 +1200, Lawrence D'Oliveiro wrote:

> In message <mailman.674.1243192904.8015.python-list at python.org>, Dennis
> Lee Bieber wrote:
> 
>> On Sun, 24 May 2009 22:47:51 +1200, Lawrence D'Oliveiro
>> <ldo at geek-central.gen.new_zealand> declaimed the following in
>> gmane.comp.python.general:
>> 
>>> As for exactitude in physics, Gregory Chaitin among others has been
>>> trying to rework physics to get rid of real numbers altogether.
>> 
>> By decreeing that the value of PI is 3?
> 
> Interesting kind of mindset, that assumes that the opposite of "real"
> must be "integer" or a subset thereof...


(0) "Opposite" is not well-defined unless you have a dichotomy. In the 
case of number fields like the reals, you have more than two options, so 
"opposite of real" isn't defined.

(1/3) Why do you jump to the conclusion that "pi=3" implies that only 
integers are defined? One might have a mapping where every real number is 
transferred to the closest multiple of 1/3 (say), rather than the closest 
integer. That would still give "pi=3", without being limited to integers.

(1/2) If you "get rid of real numbers", then obviously you must have a 
smaller set of numbers, not a larger. Any superset of reals will include 
the reals, and therefore you haven't got rid of them at all, so we can 
eliminate supersets of the reals from consideration if your description 
of Chaitin's work is accurate.

(2/3) There is *no* point (2/3).

(1) I thought about numbering my points as consecutive increasing 
integers, but decided that was an awfully boring convention. A shiny 
banananana for the first person to recognise the sequence.




-- 
Steven


From kay at fiber-space.de  Mon May 25 01:30:31 2009
From: kay at fiber-space.de (Kay Schluehr)
Date: Sun, 24 May 2009 22:30:31 -0700 (PDT)
Subject: I need help building a data structure for a state diagram
References: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>
	<89cbdfa9-2107-47c3-900c-ac0b574614a3@r37g2000yqd.googlegroups.com>
	<r%kSl.30872$YU2.3253@nlpi066.nbdc.sbc.com>
Message-ID: <39a50866-90d2-4a75-9c92-a14bfd0aef02@x3g2000yqa.googlegroups.com>

On 25 Mai, 01:46, Matthew Wilson <m... at tplus1.com> wrote:
> On Sun 24 May 2009 03:42:01 PM EDT, Kay Schluehr wrote:
>
>
>
> > General answer: you can encode finite state machines as grammars.
> > States as non-terminals and transition labels as terminals:
>
> > UNSTARTED: 'start' STARTED
> > STARTED: 'ok' FINISHED | 'cancel' ABANDONED
> > ABANDONED: 'done'
> > FINISHED: 'done'
>
> > In some sense each state-machine is also a little language.
>
> I've never formally studied grammars, but I've worked through trivial
> stuff that uses BNF to express ideas like
>
> ? ? <postal-address> ::= <name-part> <street-address> <zip-part>
>
> I don't really understand how to apply that notion to this statement:
>
> ? ? UNSTARTED: 'start' STARTED
>
> That doesn't seem to be BNF, and that's all I know about grammar stuff.

Some comments

1) The separator is arbitrary. You can use ':' or '->' or '::=' etc.
2) A full EBNF grammar can be described in itself:

   GRAMMAR: RULE+
   RULE: NAME ':' RHS
   RHS: ALT ( '|' ALT )*
   ALT: ITEM+
   ITEM: '[' RHS ']' | ATOM [ '*' | '+' ]
   ATOM: '(' RHS ')' | NAME | STRING
   STRING: '"' any* '"'
   NAME: char (digit | char)*

   [A]   zero or one repetition
   A*    zero or more repetitions
   A+    one or more repetitions
   A|B   A or B
   A B   first A next B
  (A ..) parentheses for separation
   "A"   keyword A


In some sense all the words 'start', 'done', 'ok' etc. are keywords of
the language. If I actually attempted to use the grammar for parsing
it could parse a few sentences like:

'start ok done' or 'start cancel done'

and create parse trees [UNSTARTED, start, [STARTED, ok, [FINSIHED,
done]]] etc.

One can however use the Finite State Machine generated from the
grammar for totally different purposes: interpret each rule as a state
and the keywords as events that cause state transitions.

UNSTARTED -- start --> STARTED
STARTED -- ok --> FINISHED
STARTED -- cancel --> ABANDONED
FINISHED -- done --> .
ABANDONED -- done --> .

That's basically the same formal language with a different, more
intuitive notation.










From nazia.zaman11 at gmail.com  Mon May 25 01:31:24 2009
From: nazia.zaman11 at gmail.com (nazia)
Date: Sun, 24 May 2009 22:31:24 -0700 (PDT)
Subject: Extending C++ class in python
References: <c48594af-5410-44db-b181-9b703546273b@c18g2000prh.googlegroups.com>
	<77t5u8F1i99bqU1@mid.uni-berlin.de>
Message-ID: <5cf67e15-364c-4cf3-abd9-6aab80c31ae5@b7g2000pre.googlegroups.com>

On May 24, 9:03?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> nazia schrieb:
>
> > Hi all,
> > I'm a newbie in Python and need help. Can anyone help me by explaining
> > the steps ofextendingaC++classin Python with a simple example?
> > I'm not interested to use SWIG like tools.
> > Thanks for your time.
>
> If your are not interested in using the tools provided for this task, I
> fear you won't get much help. I'd personally use SIP and can only
> recommend it.
>
> Diez

Thanks for your response.


From max at alcyone.com  Mon May 25 02:23:30 2009
From: max at alcyone.com (Erik Max Francis)
Date: Sun, 24 May 2009 23:23:30 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <mailman.694.1243232172.8015.python-list@python.org>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.535.1242945935.8015.python-list@python.org>	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>	<gvb8kn$7gm$2@lust.ihug.co.nz>	<mailman.674.1243192904.8015.python-list@python.org>	<gvd6c0$bqs$1@lust.ihug.co.nz>
	<mailman.694.1243232172.8015.python-list@python.org>
Message-ID: <7JGdnRN7Jd7_pIfXnZ2dnUVZ_uCdnZ2d@giganews.com>

Dennis Lee Bieber wrote:
> On Mon, 25 May 2009 16:21:19 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
> 
>> Interesting kind of mindset, that assumes that the opposite of "real" must 
>> be "integer" or a subset thereof...
> 
> 	No, but since PI (and e) are both transcendentals, there is NO
> representation (except by the symbols themselves) which is NOT an
> approximation.

Sure there are; you can just use other symbolic representations.  In 
fact, there are trivially an infinite number of them; e, e^1, 1/(1/e), e 
+ 1 - 1, e + 2 - 2, etc.

Even if you restrict yourself to base-b expansions (for which the 
statement is true for integer bases), you can cheat there too:  e is 1 
in base e.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM, Y!M, Skype erikmaxfrancis
   Men and women, women and men. It will never work.
    -- Erica Jong


From bottleh20 at gmail.com  Mon May 25 02:36:39 2009
From: bottleh20 at gmail.com (Water Bottle)
Date: Mon, 25 May 2009 02:36:39 -0400
Subject: wxPython ICON constants
Message-ID: <c8a21b110905242336q92ae1f4i5ebe63bfe16618db@mail.gmail.com>

I've been wondering, is there a way to grab icon information just
given the type of OS? So if I wanted to grab the Firefox icon, how
would I do that since the user could have changed the default icon to
something else? Is there a library of these constants?


From __peter__ at web.de  Mon May 25 02:38:13 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 08:38:13 +0200
Subject: writing on file not until the end
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
Message-ID: <gvdec2$uu1$01$1@news.t-online.com>

Alexzive wrote:

> I am a newby with python. I wrote the following code to extract a text
> from a file and write it to another file:
> 
> linestring = open(path, 'r').read() #read all the inp file in
> linestring
> 
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)
> 
> unfortunately when I check N.txt some lines are missing (it only crop
> until "57, 0.231749688431, 0.0405121944142" but I espect the final
> line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> all the lines until "242..")
> 
> when I try Nfile.write(textN) again it writes some more lines but
> still not all!
> what is wrong whit this?

Do you check the contents of the resulting file by feeding it to another 
program? 

> 53, 0.170973146505, 0.0466686190136
> 57, 0.231749688431, 0.0405121944142
> t60, 0.250420691759, 0.0399644155193
> 58, 0.234883810317, 0.0488399925217
> 61, 0.2666025, 0.03541845
 
There's a "t" at the start of the line after the last line you claim to see, 
so maybe your input file is corrupt and your reader stumbles over that line.

Peter



From Ron.Barak at lsi.com  Mon May 25 02:43:32 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Mon, 25 May 2009 07:43:32 +0100
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <m2y6smm7lw.fsf@valheru.db3l.homeip.net>
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
	<m2y6smm7lw.fsf@valheru.db3l.homeip.net>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A251F@enbmail01.lsi.com>

Thanks David: excellent suggestions!
I couldn't really go with the shell utilities approach, as I have no say in my user environment, and thus cannot assume which binaries are install on the user's machine.
I'll try and implement your last suggestion, and see if the performance is acceptable to (human) users.
Bye,
Ron.

> -----Original Message-----
> From: David Bolen [mailto:db3l.net at gmail.com] 
> Sent: Monday, May 25, 2009 01:58
> To: python-list at python.org
> Subject: Re: A fast way to read last line of gzip archive ?
> 
> "Barak, Ron" <Ron.Barak at lsi.com> writes:
> 
> > I thought maybe someone has a way to unzip just the end 
> portion of the 
> > archive (instead of the whole archive), as only the last part is 
> > needed for reading the last line.
> 
> The problem is that gzip compressed output has no reliable 
> intermediate break points that you can jump to and just start 
> decompressing without having worked through the prior data.
> 
> In your specific code, using readlines() is probably not 
> ideal as it will create the full list containing all of the 
> decoded file contents in memory only to let you pick the last 
> one.  So a small optimization would be to just iterate 
> through the file (directly or by calling
> readline()) until you reach the last line.
> 
> However, since you don't care about the bulk of the file, but 
> only need to work with the final line in Python, this is an 
> activity that could be handled more efficiently handled with 
> external tools, as you need not involve much intepreter time 
> to actually decompress/discard the bulk of the file.
> 
> For example, on my system, comparing these two cases:
> 
>     # last.py
> 
>     import gzip
>     import sys
> 
>     in_file = gzip.open(sys.argv[1],'r')
>     for line in in_file:
>         pass
>     print 'Last:', line
> 
> 
>     # last-popen.py
> 
>     import sys
>     from subprocess import Popen, PIPE
> 
>     # Implement gzip -dc <file> | tail -1
>     gzip = Popen(['gzip', '-dc', sys.argv[1]], stdout=PIPE)
>     tail = Popen(['tail', '-1'], stdin=gzip.stdout, stdout=PIPE)
>     line = tail.communicate()[0]
>     print 'Last:', line
> 
> with an ~80MB log file compressed to about 8MB resulted in 
> last.py taking about 26 seconds, while last-popen took about 
> 1.7s.  Both resulted in the same value in "line".  As long as 
> you have local binaries for gzip/tail (such as Cygwin or 
> MingW or equivalent) this works fine on Windows systems too.
> 
> If you really want to keep everything in Python, then I'd 
> suggest working to optimize the "skip" portion of the task, 
> trying to decompress the bulk of the file as quickly as 
> possible.  For example, one possibility would be something like:
> 
>     # last-chunk.py
>     
>     import gzip
>     import sys
>     from cStringIO import StringIO
> 
>     in_file = gzip.open(sys.argv[1],'r')
> 
>     chunks = ['', '']
>     while 1:
>         chunk = in_file.read(1024*1024)
>         if not chunk:
>             break
>         del chunks[0]
>         chunks.append(chunk)
> 
>     data = StringIO(''.join(chunks))
>     for line in data:
>         pass
>     print 'Last:', line
> 
> with the idea that you decode about a MB at a time, holding 
> onto the final two chunks (in case the actual final chunk 
> turns out to be smaller than one of your lines), and then 
> only process those for lines.  There's probably some room for 
> tweaking the mechanism for holding onto just the last two 
> chunks, but I'm not sure it will make a major difference in 
> performance.
> 
> In the same environment of mine as the earlier tests, the 
> above took about 2.7s.  So still much slower than the 
> external utilities in percentage terms, but in absolute 
> terms, a second or so may not be critical for you compared to 
> pure Python.
> 
> -- David
> 
> 

From simonwittber at gmail.com  Mon May 25 02:49:50 2009
From: simonwittber at gmail.com (Simon Wittber)
Date: Sun, 24 May 2009 23:49:50 -0700 (PDT)
Subject: select.poll returning strange file descriptors.
Message-ID: <6629b7b4-7705-4905-92f6-58962cfe1f62@y33g2000prg.googlegroups.com>

I'm using the poll object from select.poll to check for events on
sockets.

It seems to work, however when I call .poll() on the poll objects, I
sometimes get a fileno 1 returned, which is strange, because none of
the sockets I registered with the poll object have a fileno of 1. In
fact, the sockets all start from fileno 3 and go up from there.

Does anybody know why this is happening?


From ldo at geek-central.gen.new_zealand  Mon May 25 03:22:04 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 25 May 2009 19:22:04 +1200
Subject: Ted Dziuba
Message-ID: <gvdgut$i3k$1@lust.ihug.co.nz>

<http://www.theregister.co.uk/2009/05/25/dziuba_microsoft_php/page2.html>:

    If you've ever had to build C extensions to Python on Windows, you can
    join me in a feeling of satisfaction that someone at Microsoft is going
    to have to figure this out. Let's call it retribution for Internet
    Explorer 6.



From simonwittber at gmail.com  Mon May 25 03:25:27 2009
From: simonwittber at gmail.com (Simon Wittber)
Date: Mon, 25 May 2009 00:25:27 -0700 (PDT)
Subject: select.poll returning strange file descriptors.
References: <6629b7b4-7705-4905-92f6-58962cfe1f62@y33g2000prg.googlegroups.com>
Message-ID: <644d317d-7d05-4882-9940-cc4e9fe4e24e@j9g2000prh.googlegroups.com>

Solved.

I was using poll.register(fileno) without any flags specfied, which
means "tell me when _anything_ happens".

Because of this, I was receiving OOB data, which seems to use strange
fileno values.

to fix this, I now use this:

poll.register(sock.fileno(), select.POLLIN|select.POLLOUT|
select.POLLERR|select.POLLHUP)



From dhananjay.c.joshi at gmail.com  Mon May 25 03:29:33 2009
From: dhananjay.c.joshi at gmail.com (Dhananjay)
Date: Mon, 25 May 2009 12:59:33 +0530
Subject: Regarding sort()
Message-ID: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>

Hello All,

I have data set as follows:

24       GLU    3       47      LYS     6       3.909233        1
42       PRO    5       785     VAL     74      4.145114     1
54       LYS    6       785     VAL     74      4.305017      1
55       LYS    6       785     VAL     74      4.291098      1
56       LYS    7       785     VAL     74      3.968647      1
58       LYS    7       772     MET     73      4.385121       1
58       LYS    7       778     MET     73      4.422980       1
58       LYS    7       779     MET     73      3.954990       1
58       LYS    7       785     VAL     74      3.420554       1
59       LYS    7       763     GLN     72      4.431955       1
59       LYS    7       767     GLN     72      3.844037       1
59       LYS    7       785     VAL     74      3.725048       1




I want to sort the data on the basis of 3rd column first and latter want to
sort the sorted data (in first step) on the basis of 6th column.

I tried sort() function but could not get the way how to use it.

I am new to programming, please tell me how can I sort.

Thanking you in advance ........

regards




-- 
--------------------------------------------------------------
Dhananjay C Joshi
Project Assistant
Lab of Structural Biology,
CDFD, Bldg.7, Gruhakalpa
5-4-399/B, Nampally
Hyderabad- 500001, India
Tel: +91-40-24749404
Fax: +91-40-24749448
--------------------------------------------------------------
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From ldo at geek-central.gen.new_zealand  Mon May 25 03:32:00 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 25 May 2009 19:32 +1200
Subject: Optimizing math functions
References: <mailman.619.1243084999.8015.python-list@python.org>
	<0033dace$0$9725$c3e8da3@news.astraweb.com>
Message-ID: <gvdhhg$i3k$3@lust.ihug.co.nz>

In message <0033dace$0$9725$c3e8da3 at news.astraweb.com>, Steven D'Aprano 
wrote:

> Minimizing functions of two variables is difficult, as a general rule.
> Nevertheless, there are tools for doing so. Check out SciPy.

The name "Marquadt-Levenberg" comes to mind. As I recall, it involved 
finding zeroes of the various partial derivatives.



From responsible7 at gmail.com  Mon May 25 03:38:30 2009
From: responsible7 at gmail.com (responsible7 at gmail.com)
Date: Mon, 25 May 2009 00:38:30 -0700 (PDT)
Subject: PureData py/pyExt into standalone python
References: <a3e7e823-2872-4a49-9d04-82058638aff3@z7g2000vbh.googlegroups.com>
	<8f3291a1-8aa4-4313-acec-2b207fdc96d2@y10g2000prc.googlegroups.com>
Message-ID: <5d329b2f-4d13-4e83-807a-ebb600b5cfe1@g19g2000yql.googlegroups.com>

Hi again,

Comments inline:
> > responsib... at gmail.com wrote:
> > Hi guys,
> > I've written some python classes for py/pyExt extensions for the "dataflow" graphical programming environment PureData.
> > My classes talk to eachother via the PureData system, and they talk to the outside world via pyPortMIDI (which enables raw MIDI data communication).

edexter wrote:
> This might be usefull do you intend to release this code??

I do, but I want to release it as self contained Python code, at the
moment there are many dependencies. Communication between the classes
relies on py/pyExt, which relies on Flext, which relies on PureData,
which relies on Tk and Wish84, and so on and so on...

The bits of code I have written are just simple "if this string of
bytes arrived, send this string to this other blob of code" so they
don't pull in any other python extensions, it's all core stuff. only
the "send this string" part involves the py/pyExt stuff.

> There are some midi libraries that may be helpful, it is hard to tell
> what you need without seeing the code

I'm already using pyPortMidi for the midi communication. I'm just
floundering a bit when it comes to understanding how to get the
classes I've written to all exist as objects in "python-land" and
communicate between one another.


From clp2 at rebertia.com  Mon May 25 03:47:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 25 May 2009 00:47:57 -0700
Subject: Regarding sort()
In-Reply-To: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
References: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
Message-ID: <50697b2c0905250047i5888f2e7n48c502c87a70a8ab@mail.gmail.com>

On Mon, May 25, 2009 at 12:29 AM, Dhananjay <dhananjay.c.joshi at gmail.com> wrote:
> Hello All,
>
> I have data set as follows:
>
> 24?????? GLU??? 3?????? 47????? LYS???? 6?????? 3.909233??????? 1
> 42?????? PRO??? 5?????? 785???? VAL???? 74????? 4.145114???? 1
> 54?????? LYS??? 6?????? 785???? VAL???? 74????? 4.305017????? 1
> 55?????? LYS??? 6?????? 785???? VAL???? 74????? 4.291098????? 1
> 56?????? LYS??? 7?????? 785???? VAL???? 74????? 3.968647????? 1
> 58?????? LYS??? 7?????? 772???? MET???? 73????? 4.385121?????? 1
> 58?????? LYS??? 7?????? 778???? MET???? 73????? 4.422980?????? 1
> 58?????? LYS??? 7?????? 779???? MET???? 73????? 3.954990?????? 1
> 58?????? LYS??? 7?????? 785???? VAL???? 74????? 3.420554?????? 1
> 59?????? LYS??? 7?????? 763???? GLN???? 72????? 4.431955?????? 1
> 59?????? LYS??? 7?????? 767???? GLN???? 72????? 3.844037?????? 1
> 59?????? LYS??? 7?????? 785???? VAL???? 74????? 3.725048?????? 1
>
>
>
>
> I want to sort the data on the basis of 3rd column first and latter want to
> sort the sorted data (in first step) on the basis of 6th column.
>
> I tried sort() function but could not get the way how to use it.
>
> I am new to programming, please tell me how can I sort.

Well, first you need to actually *parse* the data. Right now, the
lines are (apparently) just unstructured strings, which makes them
quite hard to manipulate.

#completely untested code:
afile = open("path/to/the/file", 'r')
data = []
for line in afile:
    fields = line.strip().split()
    for i in (0,2,3,5,6): #integer field indices
        fields[i] = int(fields[i])
    fields[-2] = float(fields[-2]) #float field index
    data.append(fields)
data.sort(key = lambda item: (item[2], item[5]) )


I would highly recommend you go through one or more Python tutorials
and/or read a book on Python (or programming generally).

Cheers,
Chris
-- 
http://blog.rebertia.com

From david.lyon at preisshare.net  Mon May 25 03:50:09 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Mon, 25 May 2009 03:50:09 -0400
Subject: SendMessage question
In-Reply-To: <4A174A26.20209@sina.com>
References: <4A174A26.20209@sina.com>
Message-ID: <bca307494a8858190ddf5d65b0fed04b@preisshare.net>


you might have more luck with http://pypi.python.org/pypi/SendKeys/0.3


On Sat, 23 May 2009 08:58:14 +0800, zhouhaifeng <mypromise at sina.com> wrote:
> Hi,I want to send "ctrl + A" and "ctrl + C" to a window,
> but my code can not work, who can help me ?
> 
> Thanks a lot!
> 
> hWnd = win32gui.FindWindow(None, "?pad")
> print hWnd
> if hWnd <> 0:
> point = (555, 175)
> x, y = point
> win32api.SetCursorPos(point)
> 
> win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
> win32api.SetCursorPos(point)
> win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)
> 
> #ctrl + A
> win32api.SendMessage(hWnd, 0, win32con.VK_CONTROL, 0)
> win32api.Sleep(10)
> win32api.SendMessage(hWnd, 0, 65, 0)
> win32api.SendMessage(hWnd, win32con.KEYEVENTF_KEYUP, 65, 0)
> win32api.SendMessage(hWnd, win32con.KEYEVENTF_KEYUP, win32con.VK_CONTROL,
> 0)
> win32api.Sleep(10)
> 
> #ctrl + C
> win32api.SendMessage(hWnd, win32con.WM_KEYDOWN, win32con.VK_CONTROL, 0)
> win32api.Sleep(10)
> win32api.SendMessage(hWnd, win32con.WM_KEYDOWN, 67, 0)
> win32api.SendMessage(hWnd, win32con.WM_KEYUP, 67, 0)
> win32api.SendMessage(hWnd, win32con.WM_KEYUP, win32con.VK_CONTROL, 0)
> win32api.Sleep(10)


From jaime.frio at gmail.com  Mon May 25 03:51:42 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Mon, 25 May 2009 09:51:42 +0200
Subject: Regarding sort()
In-Reply-To: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
References: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
Message-ID: <97a8f1a70905250051o44266248k2f8c35c017fbf638@mail.gmail.com>

Hi Dhananjay,

Sort has several optional arguments, the function's signature is as follows:

s.sort([cmp[, key[, reverse]]])

If you store your data as a list of lists, to sort by the third column
you could do something like:

data.sort(None, lambda x : x[2])

For more complex sortings, as the one you propose, you need to define
a compare function, that determines if an object preceeds another or
not. In your case, something like:

def list_cmp( a, b) :
    if a[2] > b[2] :
        return 1
    elif a[2] < b[2] :
        return -1
    else : # a[2] == b[2]
        if a[5] > b[5] :
            return 1
        elif a[5] < b[5] :
            return -1
        else : # a[5] == b[5]
            return 0

data.sort(list_cmp)

should do the trick for you...

Jaime


On Mon, May 25, 2009 at 9:29 AM, Dhananjay <dhananjay.c.joshi at gmail.com> wrote:
> Hello All,
>
> I have data set as follows:
>
> 24?????? GLU??? 3?????? 47????? LYS???? 6?????? 3.909233??????? 1
> 42?????? PRO??? 5?????? 785???? VAL???? 74????? 4.145114???? 1
> 54?????? LYS??? 6?????? 785???? VAL???? 74????? 4.305017????? 1
> 55?????? LYS??? 6?????? 785???? VAL???? 74????? 4.291098????? 1
> 56?????? LYS??? 7?????? 785???? VAL???? 74????? 3.968647????? 1
> 58?????? LYS??? 7?????? 772???? MET???? 73????? 4.385121?????? 1
> 58?????? LYS??? 7?????? 778???? MET???? 73????? 4.422980?????? 1
> 58?????? LYS??? 7?????? 779???? MET???? 73????? 3.954990?????? 1
> 58?????? LYS??? 7?????? 785???? VAL???? 74????? 3.420554?????? 1
> 59?????? LYS??? 7?????? 763???? GLN???? 72????? 4.431955?????? 1
> 59?????? LYS??? 7?????? 767???? GLN???? 72????? 3.844037?????? 1
> 59?????? LYS??? 7?????? 785???? VAL???? 74????? 3.725048?????? 1
>
>
>
>
> I want to sort the data on the basis of 3rd column first and latter want to
> sort the sorted data (in first step) on the basis of 6th column.
>
> I tried sort() function but could not get the way how to use it.
>
> I am new to programming, please tell me how can I sort.
>
> Thanking you in advance ........
>
> regards
>
>
>
>
> --
> --------------------------------------------------------------
> Dhananjay C Joshi
> Project Assistant
> Lab of Structural Biology,
> CDFD, Bldg.7, Gruhakalpa
> 5-4-399/B, Nampally
> Hyderabad- 500001, India
> Tel: +91-40-24749404
> Fax: +91-40-24749448
> --------------------------------------------------------------
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From ldo at geek-central.gen.new_zealand  Mon May 25 03:52:50 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 25 May 2009 19:52:50 +1200
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<gvas9k$vvf$1@lust.ihug.co.nz>
	<mailman.702.1243237468.8015.python-list@python.org>
Message-ID: <gvdioj$iso$1@lust.ihug.co.nz>

In message <mailman.702.1243237468.8015.python-list at python.org>, Dave Angel 
wrote:

> Lawrence D'Oliveiro wrote:
>
>> Anybody remember a certain Prof William Kahan from Berkeley ...
>>   
> I remember the professor.  He was responsible for large parts of the
> Intel 8087 specification, which later got mostly codified as IEEE 754.

The 8087 was poorly designed. It was stack-based, which caused all kinds of 
performance problems that never really went away, though I think Intel tried 
to patch over them with various SSE extensions. I believe AMD64 does have 
proper floating-point registers, at last.

Apple's implementation of IEEE 754 was so rigorous that, when Motorola 
introduced the 68881, which implemented a few of the "shortcuts" that Kahan 
reviled in his foreword, Apple added a patch to its SANE library to restore 
correct results, with the usual controversy over whether the performance 
loss was worth it. If you didn't think it was, you could always use the 
68881 instructions directly.



From gagsl-py2 at yahoo.com.ar  Mon May 25 04:03:20 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 25 May 2009 05:03:20 -0300
Subject: How to send a compsite key to window
References: <4A154B42.1040306@sina.com>
Message-ID: <op.uuer5lv0x6zn5v@gabriel.sleipnir-bsas>

En Thu, 21 May 2009 09:38:26 -0300, zhouhaifeng <mypromise at sina.com>
escribi?:

> just like "ctrl + A",
>
> I want to select all the text in a window, now , I operate right menu to
> get it, but it can not work all the time.
> so I want to send "ctrl + a" to the window

I'd do it in a different way: asuming it is an edit control, send the
control an EM_SETSEL message with start=0, end=-1.
http://msdn.microsoft.com/en-us/library/bb761661(VS.85).aspx

-- 
Gabriel Genellina



From __peter__ at web.de  Mon May 25 04:05:59 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 10:05:59 +0200
Subject: Regarding sort()
References: <mailman.697.1243236580.8015.python-list@python.org>
Message-ID: <gvdjgk$pkm$00$1@news.t-online.com>

Dhananjay wrote:

> Hello All,
> 
> I have data set as follows:
> 
> 24       GLU    3       47      LYS     6       3.909233        1
> 42       PRO    5       785     VAL     74      4.145114     1
> 54       LYS    6       785     VAL     74      4.305017      1
> 55       LYS    6       785     VAL     74      4.291098      1
> 56       LYS    7       785     VAL     74      3.968647      1
> 58       LYS    7       772     MET     73      4.385121       1
> 58       LYS    7       778     MET     73      4.422980       1
> 58       LYS    7       779     MET     73      3.954990       1
> 58       LYS    7       785     VAL     74      3.420554       1
> 59       LYS    7       763     GLN     72      4.431955       1
> 59       LYS    7       767     GLN     72      3.844037       1
> 59       LYS    7       785     VAL     74      3.725048       1
> 
> 
> 
> 
> I want to sort the data on the basis of 3rd column first and latter want
> to sort the sorted data (in first step) on the basis of 6th column.
> 
> I tried sort() function but could not get the way how to use it.
> 
> I am new to programming, please tell me how can I sort.
> 
> Thanking you in advance ........

>>> data = """24       GLU    3       47      LYS     6       3.909233        
1
... 42       PRO    5       785     VAL     74      4.145114     1
... 54       LYS    6       785     VAL     74      4.305017      1
... 55       LYS    6       785     VAL     74      4.291098      1
... 56       LYS    7       785     VAL     74      3.968647      1
... 58       LYS    7       772     MET     73      4.385121       1
... 58       LYS    7       778     MET     73      4.422980       1
... 58       LYS    7       779     MET     73      3.954990       1
... 58       LYS    7       785     VAL     74      3.420554       1
... 59       LYS    7       763     GLN     72      4.431955       1
... 59       LYS    7       767     GLN     72      3.844037       1
... 59       LYS    7       785     VAL     74      3.725048       1
... """
>>> rows = data.splitlines()
>>> rows.sort(key=lambda line: int(line.split()[5]))
>>> rows.sort(key=lambda line: int(line.split()[2]))
>>> print "\n".join(rows)
24       GLU    3       47      LYS     6       3.909233        1
42       PRO    5       785     VAL     74      4.145114     1
54       LYS    6       785     VAL     74      4.305017      1
55       LYS    6       785     VAL     74      4.291098      1
59       LYS    7       763     GLN     72      4.431955       1
59       LYS    7       767     GLN     72      3.844037       1
58       LYS    7       772     MET     73      4.385121       1
58       LYS    7       778     MET     73      4.422980       1
58       LYS    7       779     MET     73      3.954990       1
56       LYS    7       785     VAL     74      3.968647      1
58       LYS    7       785     VAL     74      3.420554       1
59       LYS    7       785     VAL     74      3.725048       1

Python's list.sort() is "stable". Therefore you can sort by the 6th column 
first, and then by the third. Rows with the same value in the third column 
will not change their relative position.

To calculate the value for the n-th row you can either use the above lambda 
or the equivalent function:

def sixth_column(row):
    columns = row.split() # split by whitespace
    column = columns[5] # sixth column
    return int(column) # convert to integer

If you don't convert to integer a row with "10" comes before a row with "2" 
in the column which is probably not what you want.

Peter



From __peter__ at web.de  Mon May 25 04:13:03 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 10:13:03 +0200
Subject: Regarding sort()
References: <mailman.697.1243236580.8015.python-list@python.org>
	<gvdjgk$pkm$00$1@news.t-online.com>
Message-ID: <gvdjts$qgk$00$1@news.t-online.com>

Peter Otten wrote:

>>>> rows = data.splitlines()
>>>> rows.sort(key=lambda line: int(line.split()[5]))
>>>> rows.sort(key=lambda line: int(line.split()[2]))
>>>> print "\n".join(rows)

Of course you can also sort in a single step:

>>> rows = data.splitlines()
>>> def key(row):
...     columns = row.split()
...     return int(columns[2]), int(columns[5])
...
>>> rows.sort(key=key)
>>> print "\n".join(rows)

Peter



From clp2 at rebertia.com  Mon May 25 04:15:26 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 25 May 2009 01:15:26 -0700
Subject: Regarding sort()
In-Reply-To: <97a8f1a70905250051o44266248k2f8c35c017fbf638@mail.gmail.com>
References: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
	<97a8f1a70905250051o44266248k2f8c35c017fbf638@mail.gmail.com>
Message-ID: <50697b2c0905250115kb3bd9abq662c09ecd29763cb@mail.gmail.com>

On Mon, May 25, 2009 at 12:51 AM, Jaime Fernandez del Rio
<jaime.frio at gmail.com> wrote:
> Hi Dhananjay,
>
> Sort has several optional arguments, the function's signature is as follows:
>
> s.sort([cmp[, key[, reverse]]])
>
> If you store your data as a list of lists, to sort by the third column
> you could do something like:
>
> data.sort(None, lambda x : x[2])
>
> For more complex sortings, as the one you propose, you need to define
> a compare function, that determines if an object preceeds another or
> not. In your case, something like:

Erm, using a compare function rather than a key function slows down
sorting /significantly/. In fact, the `cmp` parameter to list.sort()
has been *removed* in Python 3.0 because of this.

Also, top-posting is evil. Please avoid it in the future.

Cheers,
Chris
-- 
http://blog.rebertia.com


From zasaconsulting at gmail.com  Mon May 25 04:30:01 2009
From: zasaconsulting at gmail.com (Alessandro)
Date: Mon, 25 May 2009 01:30:01 -0700 (PDT)
Subject: writing on file not until the end
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
	<gvdec2$uu1$01$1@news.t-online.com>
Message-ID: <2264b63d-1ab5-4773-8b2c-4fdfb574c7b9@z5g2000yqn.googlegroups.com>

On May 25, 8:38 am, Peter Otten <__pete... at web.de> wrote:
> Alexzive wrote:
> > I am a newby with python. I wrote the following code to extract a text
> > from a file and write it to another file:
>
> > linestring = open(path, 'r').read() #read all the inp file in
> > linestring
>
> > i=linestring.index("*NODE")
> > i=linestring.index("E",i)
> > e=linestring.index("*",i+10)
> > textN = linestring[i+2:e-1] # crop the ELement+nodes list
> > Nfile = open("N.txt", "w")
> > Nfile.write(textN)
>
> > unfortunately when I check N.txt some lines are missing (it only crop
> > until "57, 0.231749688431, 0.0405121944142" but I espect the final
> > line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> > all the lines until "242..")
>
> > when I try Nfile.write(textN) again it writes some more lines but
> > still not all!
> > what is wrong whit this?
>
> Do you check the contents of the resulting file by feeding it to another
> program?
>
> > 53, 0.170973146505, 0.0466686190136
> > 57, 0.231749688431, 0.0405121944142
> > t60, 0.250420691759, 0.0399644155193
> > 58, 0.234883810317, 0.0488399925217
> > 61, 0.2666025, 0.03541845
>
> There's a "t" at the start of the line after the last line you claim to see,
> so maybe your input file is corrupt and your reader stumbles over that line.
>
> Peter

Thank you all for replying.

- yes, I oversaw the "t" at "60, 0.250420691759, 0.0399644155193". I
then removed it for the following tests
- changing from "e-1" to "e" apparently solved the problem, BUT I then
realized it was just because a second access to the file (still open)
seems to be the real solution --> after Nfile.close() e retrying with
"e" instead of "e-1" the problem is still there.
- I also tryied to inizialize e and i to zero --> nothing changes
- until now, the only solution which works is to repeat the code while
the file is still open, which means a quite redundant code:

linestring = open(path, 'r').read()
i=linestring.index("*NODE")
i=linestring.index("E",i)
e=linestring.index("*",i+10)
textN = linestring[i+2:e-1] # crop the ELement+nodes list
Nfile = open("N.txt", "w")
Nfile.write(textN)

linestring = open(path, 'r').read()
i=linestring.index("*NODE")
i=linestring.index("E",i)
e=linestring.index("*",i+10)
textN = linestring[i+2:e-1] # crop the ELement+nodes list
Nfile = open("N.txt", "w")
Nfile.write(textN)

Alex


From mohammed.abosalim at gmail.com  Mon May 25 04:40:57 2009
From: mohammed.abosalim at gmail.com (abosalim)
Date: Mon, 25 May 2009 01:40:57 -0700 (PDT)
Subject: Need Help
References: <5f238e07-8d39-4bb4-8c6a-cbd56412fb5a@c36g2000yqn.googlegroups.com>
	<m2y6sm6tak.fsf@cs.uu.nl>
	<pan.2009.05.25.02.39.37@REMOVE.THIS.cybersource.com.au>
Message-ID: <7f5b3761-ff6c-4448-81da-a0bc2eced6c9@l12g2000yqo.googlegroups.com>

On May 25, 5:39?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 25 May 2009 00:16:19 +0200, Piet van Oostrum wrote:
> > By the way, it is better to add python code as attachment instead of
> > inline text because some news software might fold the lines like in your
> > posting, making it difficult to reconstruct the code.
>
> Except that some news software might not show the attachment at all.
>
> --
> Steven

I modified the method,but it can't identified it.(self.res=textcorrect
(self.string)
NameError: global name 'textcorrect' is not defined)
This is what i done:


import re, collections
from Tkinter import *
from nltk_lite import tokenize
class Ex3:
    def __init__(self, master):
        self.frame = Frame(master)
        self.frame.pack()
        self.field = Entry(self.frame)
        self.field.pack(side=TOP)
        self.contents = StringVar()
        self.field.config(text=self.contents)
        self.stop = Button(self.frame, text="Exit", fg="red",
command=self.frame.quit)
        self.stop.pack(side=RIGHT)
        self.enter = Button(self.frame, text="Correct", fg="black",
command=self.new)
        self.enter.pack(side=LEFT)



    def words(text): return re.findall('[a-z]+', text.lower())
    def train(features):
        model = collections.defaultdict(lambda: 1)
        for f in features:
            model[f] += 1
            return model
        NWORDS = train(words(file('big1.txt').read()))
        alphabet = 'abcdefghijklmnopqrstuvwxyz'
    def edits1(word):
        s = [(word[:i], word[i:]) for i in range(len(word) + 1)]
        deletes = [a + b[1:] for a, b in s if b]
        transposes = [a + b[1] + b[0] + b[2:] for a, b in s if len(b)
>1]
        replaces = [a + c + b[1:] for a, b in s for c in alphabet if
b]
        inserts = [a + c + b for a, b in s for c in alphabet]
        return set(deletes + transposes + replaces + inserts)
    def known_edits2(word):
        return set(e2 for e1 in edits1(word) for e2 in edits1(e1) if
e2 in NWORDS)
    def known(words):
        return set(w for w in words if w in NWORDS)
    def correct(word):
        candidates = known([word]) or known(edits1(word)) or
known_edits2(word) or [word]
        return max(candidates, key=lambda w: NWORDS[w])
    def textcorrect(str):
        s=[]
        for i in tokenize.whitespace(str):
            s.append(correct(i))
            result= " ".join(s)
            return result
    def new(self):
        self.string = self.contents.get()
        #pass contents of textfield to textcorrect()method above
        self.res=textcorrect(self.string)
        self.frame2 = Frame()
        self.frame2.pack()
        self.words = Label(self.frame2, text=self.res, fg="blue", font=
("Arial", 16))
        self.words.pack()

root = Tk()
Ex3 = Ex3(root)
root.mainloop()















From andrea.gavana at gmail.com  Mon May 25 04:41:16 2009
From: andrea.gavana at gmail.com (Infinity77)
Date: Mon, 25 May 2009 01:41:16 -0700 (PDT)
Subject: Multiprocessing and file I/O
References: <ab7dd7b6-40dd-46a7-8bda-d30d9bfbb7df@m17g2000vbi.googlegroups.com>
	<mailman.654.1243167010.8015.python-list@python.org>
	<8e21bc22-ad0e-4c18-85e2-df6e84d1afc3@n8g2000vbb.googlegroups.com>
	<448f0706-546a-4945-aae3-00a1dcd9ea8d@c36g2000yqn.googlegroups.com>
Message-ID: <6d01b1b9-d0d5-4e5c-8fad-580c0bf27941@z19g2000vbz.googlegroups.com>

Hi Paul & All,

On May 24, 4:16?pm, Paul Boddie <p... at boddie.org.uk> wrote:
> On 24 Mai, 16:13, Infinity77 <andrea.gav... at gmail.com> wrote:
>
>
>
> > No, the processing of the data is fast enough, as it is very simple.
> > What I was asking is if anyone could share an example of using
> > multiprocessing to read a file, along the lines I described above.
>
> Take a look at this section in an article about multi-threaded
> processing of large files:
>
> http://effbot.org/zone/wide-finder.htm#a-multi-threaded-python-solution

Thank you for the pointer, I have read the article and the follow-ups
with much interest... it's unfortunate Python is no more on the first
place though :-D
I'll see if I can come up with a faster implementation of my (f2py-
fortran-based) Python module using multiprocessing.

Thank you.

Andrea.


From charlietaylor at users.sourceforge.net  Mon May 25 04:48:03 2009
From: charlietaylor at users.sourceforge.net (Charlie)
Date: Mon, 25 May 2009 08:48:03 +0000 (UTC)
Subject: Optimizing math functions
References: <mailman.619.1243084999.8015.python-list@python.org>	<0033dace$0$9725$c3e8da3@news.astraweb.com>
	<loom.20090524T083337-764@post.gmane.org>
	<4A193DD5.4090401@hotmail.com>
Message-ID: <loom.20090525T082837-787@post.gmane.org>

Esmail <ebonak <at> hotmail.com> writes:

> 
> Charlie wrote:
> > 
> > You might also look at:
> > http://pyparasol.sourceforge.net/example_1.html
> 
> Thanks for this lead, I had never heard of parasol before. Do you know
> if this also works under Linux? The docs mention only the Windows platform,
> but given that this is Python perhaps it is save to assume this would also
> work under Linux?
> 
> Esmail
> 

It might work under Linux, however, it was developed under Windows and, to my
knowledge, has never been tested on a Linux machine.  Basic operation only
depends on installations of matplotlib, numpy, and scipy.  Those packages are
all available on Linux.

If you try it, I'd like to know the outcome.

The parasol options to launch Microsoft Office apps Excel, Power Point, and
Word; or the ray tracing app POV-Ray, will very likely fail.

Charlie



From __peter__ at web.de  Mon May 25 04:52:30 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 10:52:30 +0200
Subject: writing on file not until the end
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
	<gvdec2$uu1$01$1@news.t-online.com>
	<2264b63d-1ab5-4773-8b2c-4fdfb574c7b9@z5g2000yqn.googlegroups.com>
Message-ID: <gvdm7q$dud$01$1@news.t-online.com>

Alessandro wrote:

> - until now, the only solution which works is to repeat the code while
> the file is still open, which means a quite redundant code:
> 
> linestring = open(path, 'r').read()
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)
> 
> linestring = open(path, 'r').read()
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)

Is this the complete script? The only effect of the second copy of your code 
above is that it implicitly closes the first Nfile. Otherwise it is cargo 
cult.

Peter 



From sjmachin at lexicon.net  Mon May 25 04:58:38 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 25 May 2009 01:58:38 -0700 (PDT)
Subject: writing on file not until the end
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
	<gvdec2$uu1$01$1@news.t-online.com>
	<2264b63d-1ab5-4773-8b2c-4fdfb574c7b9@z5g2000yqn.googlegroups.com>
Message-ID: <e6727293-bbc4-4977-93c5-44dde89a8929@d19g2000prh.googlegroups.com>

On May 25, 6:30?pm, Alessandro <zasaconsult... at gmail.com> wrote:
> On May 25, 8:38 am, Peter Otten <__pete... at web.de> wrote:
>
>
>
> > Alexzive wrote:
> > > I am a newby with python. I wrote the following code to extract a text
> > > from a file and write it to another file:
>
> > > linestring = open(path, 'r').read() #read all the inp file in
> > > linestring
>
> > > i=linestring.index("*NODE")
> > > i=linestring.index("E",i)
> > > e=linestring.index("*",i+10)
> > > textN = linestring[i+2:e-1] # crop the ELement+nodes list
> > > Nfile = open("N.txt", "w")
> > > Nfile.write(textN)
>
> > > unfortunately when I check N.txt some lines are missing (it only crop
> > > until "57, 0.231749688431, 0.0405121944142" but I espect the final
> > > line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> > > all the lines until "242..")
>
> > > when I try Nfile.write(textN) again it writes some more lines but
> > > still not all!
> > > what is wrong whit this?
>
> > Do you check the contents of the resulting file by feeding it to another
> > program?
>
> > > 53, 0.170973146505, 0.0466686190136
> > > 57, 0.231749688431, 0.0405121944142
> > > t60, 0.250420691759, 0.0399644155193
> > > 58, 0.234883810317, 0.0488399925217
> > > 61, 0.2666025, 0.03541845
>
> > There's a "t" at the start of the line after the last line you claim to see,
> > so maybe your input file is corrupt and your reader stumbles over that line.
>
> > Peter
>
> Thank you all for replying.
>
> - yes, I oversaw the "t" at "60, 0.250420691759, 0.0399644155193". I
> then removed it for the following tests
> - changing from "e-1" to "e" apparently solved the problem, BUT I then
> realized it was just because a second access to the file (still open)
> seems to be the real solution --> after Nfile.close() e retrying with
> "e" instead of "e-1" the problem is still there.
> - I also tryied to inizialize e and i to zero --> nothing changes
> - until now, the only solution which works is to repeat the code while
> the file is still open, which means a quite redundant code:
>
> linestring = open(path, 'r').read()
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)

Insert here:
Nfile.close()

Remove the redundant second pass.

> linestring = open(path, 'r').read()
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)




From niklas.norrthon at hotmail.com  Mon May 25 05:22:11 2009
From: niklas.norrthon at hotmail.com (Niklas Norrthon)
Date: Mon, 25 May 2009 02:22:11 -0700 (PDT)
Subject: Can I get a technical explanation on the following error
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
	<4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>
	<1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
	<mailman.679.1243200974.8015.python-list@python.org>
	<4a1a1084$0$19026$4c5ecfc7@fe1.usenet.com>
Message-ID: <91e577a6-964a-412c-888f-02ffd6bca699@o18g2000yqi.googlegroups.com>

On 25 Maj, 05:29, Jim Garrison <j... at acm.org> wrote:
> And as an interesting exercise, try
>
> print r'test \'
> print r'test \\'
>
> Because of the way raw string parsing is defined, neither of these will
> pass the parser. ?In fact, a raw string cannot have a backslash as
> its last character.

Tried it:
>>> r'test \'
SyntaxError: EOL while scanning string literal

>>> r'test \\'
'test \\\\'

Second one is accepted. See the language reference section 2.4.1 as of
why; http://www.python.org/doc/current/reference/lexical_analysis.html?highlight=raw%20strings#string-literals

/Niklas Norrthon


From zasaconsulting at gmail.com  Mon May 25 05:35:10 2009
From: zasaconsulting at gmail.com (Alessandro)
Date: Mon, 25 May 2009 02:35:10 -0700 (PDT)
Subject: writing on file not until the end
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
	<gvdec2$uu1$01$1@news.t-online.com>
	<2264b63d-1ab5-4773-8b2c-4fdfb574c7b9@z5g2000yqn.googlegroups.com>
	<e6727293-bbc4-4977-93c5-44dde89a8929@d19g2000prh.googlegroups.com>
Message-ID: <fdde3592-6741-416b-8904-d659c91dfb42@3g2000yqk.googlegroups.com>

On May 25, 10:58 am, John Machin <sjmac... at lexicon.net> wrote:
> On May 25, 6:30 pm, Alessandro <zasaconsult... at gmail.com> wrote:
>
>
>
> > On May 25, 8:38 am, Peter Otten <__pete... at web.de> wrote:
>
> > > Alexzive wrote:
> > > > I am a newby with python. I wrote the following code to extract a text
> > > > from a file and write it to another file:
>
> > > > linestring = open(path, 'r').read() #read all the inp file in
> > > > linestring
>
> > > > i=linestring.index("*NODE")
> > > > i=linestring.index("E",i)
> > > > e=linestring.index("*",i+10)
> > > > textN = linestring[i+2:e-1] # crop the ELement+nodes list
> > > > Nfile = open("N.txt", "w")
> > > > Nfile.write(textN)
>
> > > > unfortunately when I check N.txt some lines are missing (it only crop
> > > > until "57, 0.231749688431, 0.0405121944142" but I espect the final
> > > > line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> > > > all the lines until "242..")
>
> > > > when I try Nfile.write(textN) again it writes some more lines but
> > > > still not all!
> > > > what is wrong whit this?
>
> > > Do you check the contents of the resulting file by feeding it to another
> > > program?
>
> > > > 53, 0.170973146505, 0.0466686190136
> > > > 57, 0.231749688431, 0.0405121944142
> > > > t60, 0.250420691759, 0.0399644155193
> > > > 58, 0.234883810317, 0.0488399925217
> > > > 61, 0.2666025, 0.03541845
>
> > > There's a "t" at the start of the line after the last line you claim to see,
> > > so maybe your input file is corrupt and your reader stumbles over that line.
>
> > > Peter
>
> > Thank you all for replying.
>
> > - yes, I oversaw the "t" at "60, 0.250420691759, 0.0399644155193". I
> > then removed it for the following tests
> > - changing from "e-1" to "e" apparently solved the problem, BUT I then
> > realized it was just because a second access to the file (still open)
> > seems to be the real solution --> after Nfile.close() e retrying with
> > "e" instead of "e-1" the problem is still there.
> > - I also tryied to inizialize e and i to zero --> nothing changes
> > - until now, the only solution which works is to repeat the code while
> > the file is still open, which means a quite redundant code:
>
> > linestring = open(path, 'r').read()
> > i=linestring.index("*NODE")
> > i=linestring.index("E",i)
> > e=linestring.index("*",i+10)
> > textN = linestring[i+2:e-1] # crop the ELement+nodes list
> > Nfile = open("N.txt", "w")


I closed and restarted the python console. Now this code (with added
"Nfile.close()" at the end) seems to work properly:

linestring = open(path, 'r').read()
i=linestring.index("*NODE")
i=linestring.index("E",i)
e=linestring.index("*",i+10)
textN = linestring[i+2:e-1]
Nfile = open("N.txt", "w")
Nfile.write(textN)
Nfile.close()

thanks, Alex


From jaime.frio at gmail.com  Mon May 25 05:44:02 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Mon, 25 May 2009 11:44:02 +0200
Subject: Regarding sort()
In-Reply-To: <50697b2c0905250115kb3bd9abq662c09ecd29763cb@mail.gmail.com>
References: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
	<97a8f1a70905250051o44266248k2f8c35c017fbf638@mail.gmail.com>
	<50697b2c0905250115kb3bd9abq662c09ecd29763cb@mail.gmail.com>
Message-ID: <97a8f1a70905250244o5129e21dxb50e04531e5bb430@mail.gmail.com>

On Mon, May 25, 2009 at 10:15 AM, Chris Rebert <clp2 at rebertia.com> wrote:
> Erm, using a compare function rather than a key function slows down
> sorting /significantly/. In fact, the `cmp` parameter to list.sort()
> has been *removed* in Python 3.0 because of this.

Makes a lot of sense, as you only have to run the slow python function
N times, rather than doing it N log N times...

So I guess I have also learned today that the internal cmp can handle
lists and tuples properly, i.e (1,7) > (1,5), definitely a much neater
way of doing things: the reasons are starting to pile to fare 2.6
goodbye and move on to 3.0...

>
> Also, top-posting is evil. Please avoid it in the future.

Must be the mad scientist wanting to take over the world in me. ;-)

Note taken...

Jaime

>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From pdpinheiro at gmail.com  Mon May 25 05:47:14 2009
From: pdpinheiro at gmail.com (pdpi)
Date: Mon, 25 May 2009 02:47:14 -0700 (PDT)
Subject: Can I get a technical explanation on the following error
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
Message-ID: <5a397ae7-4a67-44ef-9214-e0834de3aa72@e20g2000vbc.googlegroups.com>

On May 24, 6:41?pm, grocery_stocker <cdal... at gmail.com> wrote:
> How come something like '\' ?causes an error? Here is what I mean.
>
> [cdalten at localhost ~]$ python
> Python 2.6.2 (r262:71600, May ?3 2009, 17:04:44)
> [GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> print "test \"
>
> ? File "<stdin>", line 1
> ? ? print "test \"
> ? ? ? ? ? ? ? ? ?^
> SyntaxError: EOL while scanning string literal
>
>
>
> I mean, isn't the '\' a character just like the letter 't'?

Ask yourself: 'How would I tell Python to print the " character when
it's used as the string delimitation character?'. Unlike us (you
probably didn't even blink at the usage of ' in "it's" versus its
usage as quote delimiters in that sentence), computers can't quite
tell usage from context. So you have to come up with a way to express
ourselves. Many languages use the \ character as an escape character,
which modifies the meaning of the next character in a string. \n, \t,
\" are all common. Other languages use other conventions -- I program
ABAP professionally, and it uses ' as the string delimiter, and '' as
a literal -- so a string with one single ' is expressed as ''''.

The python interpreter isn't doing any bit magic here, it's just
reading a \ character followed by a " character and changing its
interpretation of " appropriately.


From neilcrighton at gmail.com  Mon May 25 05:50:39 2009
From: neilcrighton at gmail.com (Neil Crighton)
Date: Mon, 25 May 2009 09:50:39 +0000 (UTC)
Subject: Regarding sort()
References: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
Message-ID: <loom.20090525T093458-170@post.gmane.org>

Dhananjay <dhananjay.c.joshi <at> gmail.com> writes:

> I want to sort the data on the basis of 3rd column first and latter want to 
> sort the sorted data (in first step) on the basis of 6th column.I tried 
> sort() function but could not get the way how to use it.I am new to 
> programming, please tell me how can I sort.Thanking you in advance 


If you want to use numpy, you can do this (in version 1.2 or above):

Assuming the columns of data you posted are in a text file called temp.txt,

>>> import numpy as np

Read the file to a numpy array and convert to int, float or string as
appropriate. Each column is given a name - 'f0' is the first column, 'f1' is the
second column, and so on.

>>> data = np.genfromtxt('temp.txt', dtype=None)

Sort rows by the 3rd column, and if the 3rd column values are the same, sort by
the 6th column:

>>> data.sort(order=['f2', 'f5'])



Neil





From mail at microcorp.co.za  Mon May 25 05:59:39 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 25 May 2009 11:59:39 +0200
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com><mailman.535.1242945935.8015.python-list@python.org><1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com><7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com><gvb8kn$7gm$2@lust.ihug.co.nz>
	<gvc6np$plr$1@ger.gmane.org>
Message-ID: <001301c9dd1f$8bf53f40$0d00a8c0@Hendrik>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote:


> On Sun, 24 May 2009 22:47:51 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
> 
> 
> > As for exactitude in physics, Gregory Chaitin among others has been trying 
> > to rework physics to get rid of real numbers altogether.
> 
> By decreeing that the value of PI is 3?

naah - that would be too crude, even for a physicist - pi is 22//7..

;-)

- Hendrik



From jos.koot at telefonica.net  Mon May 25 06:05:37 2009
From: jos.koot at telefonica.net (jos koot)
Date: Mon, 25 May 2009 03:05:37 -0700 (PDT)
Subject: INVITATION FLIB: Fringe/Functional Languages In Barcelona user group.
Message-ID: <417be943-e353-43ff-8689-b3afd8e6ae26@l32g2000vba.googlegroups.com>

INVITATION
We, (Jose A. Ortega Ruiz jao at gnu.org, Andy Wingo wingo at pobox.com and
Jos Koot jos.koot at telefonica.net) have scheduled a meeting in
Barcelona (Spain) with the intention to form a user group FLIB: Fringe/
Functional Languages In Barcelona. Everyone who is interested in
shaping this group is invited to share us.

June 10 2009 at 7.30 PM
Calle del Pi 3 Principal Interior (first floor)
Barcelona
Spain

Preliminary program

Welcome.
Short discussion about what FLIB should be and should not be.
Jose: communication about FUEL (Factors Ultimate Emacs Library)
Jos : 5 minute click/lightning talk on his recent experiences with
PLT's redex library.
You: 5 minut click/lightning talk.
Many more of you: 5 minut click/lightning talks.
Informal meeting in the conference room or in a bar or simple
restaurant within walking distance.

The preferred language is English, but click talks can also be in
Castiliano (Spanish) or in Catala.
If you intend to come, let us know by email, please, in order that we
can estimate the number of participants.
If you intend to do a click talk, please let us know too.

Please forward this invitation to relevant mailing lists we may have
missed.
Hope to meet you on June the tenth.

jao at gnu.org
wingo at pobox.com
jos.koot at telefonica.net


From giovanni.gherdovich at sophia.inria.fr  Mon May 25 06:22:03 2009
From: giovanni.gherdovich at sophia.inria.fr (Giovanni Gherdovich)
Date: Mon, 25 May 2009 12:22:03 +0200
Subject: what I would like python.el to do (and maybe it does)
Message-ID: <4A1A714B.1010408@sophia.inria.fr>

Hello everybody,

basically I'm writing here since I cannot
make my python.el work (a major mode for writing
python with emacs), but I would also like to share
my user experience and tell you what I think
an emacs mode should do, why do I like them
and hopefully have some feedbacks to see if I
misunderstood/underestimate something.


== 1) my python.el doesn't behave very well ==

I learnt somewhere
http://www.emacswiki.org/emacs/PythonMode
that there are two major emacs mode for python around:
python-mode.el and python.el.
Asking my Emacs 22.3.1 about the variable load-path
issuing
'C-h v load-path RET
I see that
/usr/share/emacs/22.3/lisp/progmodes
is in that path; there I find a file named
python.elc
which I assume to be some kind of emacs lisp bytecode
since is pretty much unreadable.

So I searched the web for a plain version of it,
finding that the feature I use more, i.e.
sending a line of a text file to the
python buffer for evaluation (see below), correspond
to the key sequence

\C-c\C-c

(well, it's python-send-buffer, so maybe not a single
line but the whole buffer; the closest to my needs, anyway).
However: I open my Emacs, issue M-x python-mode,
then M-x run-python to have the interpreter in
a second buffer, I type something in the
first buffer and then C-c C-c, but nothing happens.

Am I missing something?
Do I have any hope of having some sort of
send-line-to-python-buffer function working?


== 2) How do I use emacs modes for interpreted languages ==

Please note that what follows is just the personal perspective
of an unexperienced user.

Syntax highlighting is a great thing, but is not as critical
to me as the feature I describe below.

When I work with interpreted languages, I really hate doing it
in the shell; after 20 commands I easily lose control on
what happens and on which definitions are around.

I use Emacs instead, so that I can have two buffers; in the
first I type my expressions, in the second I evaluate them
using some key bindings so that I can easily send the text
from the first buffer to the second one line by line.

In this way I can easily refactor my code, and eventually package it
in a script if I like.
Usually after a while the intepreter buffer is a big mess,
so I restart it but my code is safe and sound in the first buffer.

To do so, I don't really need a major mode, I admit; I just need
to put the following code in my .emacs:

(fset 'send-line-other-window
  [?\C-a ?\C- ?\C-e ?M-w right
   ?C-x ?o ?C-y return ?\C-x ?o])
(global-set-key [f11] 'send-line-other-window)

Then I open emacs, C-x 2 to have a second buffer,
C-x o to switch to it and M-x shell to run bash in it.
Then, in the case of python, I run "python" in the
bash buffer. Then I type my code in the first and with F11
I send lines to the interpreter.

But since i like to do it The Right Way, I would
like to let the python-mode worry about this...

Sorry if this is just a bunch of obvious thoughts to most of you.

Regards,
Giovanni



From jarausch at igpm.rwth-aachen.de  Mon May 25 06:59:21 2009
From: jarausch at igpm.rwth-aachen.de (Helmut Jarausch)
Date: Mon, 25 May 2009 12:59:21 +0200
Subject: email scanning for X-Spam-Score
Message-ID: <77vc0bF1ikvrgU1@mid.dfncis.de>

Hi,

my emails received from our mailing system contain a field like

X-Spam-Score: -2.2

Given the full email message in 'msg'
I've tried
   mailmsg = email.message_from_string(msg)
   SPAM_CORE = mailmsg['X-Spam-Score']
but it doesn't work.
What am I missing?

Many thanks for a hint,
Helmut.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From ebonak at hotmail.com  Mon May 25 07:08:46 2009
From: ebonak at hotmail.com (Esmail)
Date: Mon, 25 May 2009 07:08:46 -0400
Subject: Python -> R?
In-Reply-To: <15e4667e0905241932p2a47b08aj9dc79aaeadf32078@mail.gmail.com>
References: <gv90n1$1h4$1@ger.gmane.org>
	<15e4667e0905241932p2a47b08aj9dc79aaeadf32078@mail.gmail.com>
Message-ID: <4A1A7C3E.3000105@hotmail.com>

Dan Yamins wrote:
> 
> 
>     If so, what are you using? I have read about RPy, is that a good
>     solution?
> 
> 
> 
> Yes, I think it's quite a good solution.  It's not exactly 100% as 
> convenient as working directly in R, but that's IMO more than 
> compensated by the ability to use Python's syntax.   
> 
> Make sure you use Rpy2 (the successor to Rpy) -- I find it significantly 
> better.   However, the online documentation is in IMHO a little thin -- 
> at least, in terms of examples -- so I once wrote up a little 5-minute 
> tutorial to show a friend how to use Rpy2.  I've attached it to this 
> message -- you may find it useful.

thanks! I played around just a bit with RPy yesterday, but I had no
idea there was Rpy2 .. I'll be sure to take a look.

Best,
Esmail



From ebonak at hotmail.com  Mon May 25 07:10:11 2009
From: ebonak at hotmail.com (Esmail)
Date: Mon, 25 May 2009 07:10:11 -0400
Subject: Python -> R?
In-Reply-To: <42eea1a3-742c-4cc9-aaf9-54b7305dfc39@j18g2000prm.googlegroups.com>
References: <mailman.623.1243088434.8015.python-list@python.org>
	<42eea1a3-742c-4cc9-aaf9-54b7305dfc39@j18g2000prm.googlegroups.com>
Message-ID: <gvduaj$o3b$2@ger.gmane.org>

edexter wrote:
> 
> I was playing around with a r sound module and looking at the graphic
> stuff and I have downloaded the rpy thing but I have never used
> it....  I have been looking for a good excuse to use it...  It looks
> like it could be useful for graphing stuff or maybe alogrithmic
> (spelling I am sure) composition...  The R people have a publication
> somewhat like the python papers where you might find something
> intresting.

Thanks .. I tried out a few simple things with RPy yesterday (calling
a few functions and some simple plots) and it seemed to work ok.

Esmail



From __peter__ at web.de  Mon May 25 07:17:32 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 13:17:32 +0200
Subject: email scanning for X-Spam-Score
References: <77vc0bF1ikvrgU1@mid.dfncis.de>
Message-ID: <gvduno$cur$03$1@news.t-online.com>

Helmut Jarausch wrote:

> my emails received from our mailing system contain a field like
> 
> X-Spam-Score: -2.2
> 
> Given the full email message in 'msg'
> I've tried
>    mailmsg = email.message_from_string(msg)
>    SPAM_CORE = mailmsg['X-Spam-Score']
> but it doesn't work.

What do you mean by "doesn't work"?

> What am I missing?

No idea. It seems to "work" over here:

Python 2.6.2 (release26-maint, Apr 19 2009, 01:58:18)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import email
>>> spam = open("spam.txt").read()
>>> m = email.message_from_string(spam)
>>> m["X-Spam-Score"]
'15.0 (+++++++++++++++)'

Peter



From jarausch at igpm.rwth-aachen.de  Mon May 25 07:23:58 2009
From: jarausch at igpm.rwth-aachen.de (Helmut Jarausch)
Date: Mon, 25 May 2009 13:23:58 +0200
Subject: email scanning for X-Spam-Score
In-Reply-To: <gvduno$cur$03$1@news.t-online.com>
References: <77vc0bF1ikvrgU1@mid.dfncis.de> <gvduno$cur$03$1@news.t-online.com>
Message-ID: <4A1A7FCE.4030005@igpm.rwth-aachen.de>

Peter Otten wrote:
> Helmut Jarausch wrote:
> 
>> my emails received from our mailing system contain a field like
>>
>> X-Spam-Score: -2.2
>>
>> Given the full email message in 'msg'
>> I've tried
>>    mailmsg = email.message_from_string(msg)
>>    SPAM_CORE = mailmsg['X-Spam-Score']
>> but it doesn't work.
> 
> What do you mean by "doesn't work"?
> 
>> What am I missing?
> 
> No idea. It seems to "work" over here:
> 
> Python 2.6.2 (release26-maint, Apr 19 2009, 01:58:18)
> [GCC 4.3.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import email
>>>> spam = open("spam.txt").read()
>>>> m = email.message_from_string(spam)
>>>> m["X-Spam-Score"]
> '15.0 (+++++++++++++++)'
> 
> Peter
> 

Oh yes, thanks,
my test email was quite long and so I overlooked it contained 2 emails instead
of just one.

Sorry for the noise,
Helmut.


-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From roy at panix.com  Mon May 25 07:27:37 2009
From: roy at panix.com (Roy Smith)
Date: Mon, 25 May 2009 07:27:37 -0400
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
	<gvd1id$8jj$2@lust.ihug.co.nz>
Message-ID: <roy-50FE2E.07273725052009@news.panix.com>

In article <gvd1id$8jj$2 at lust.ihug.co.nz>,
 Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:

> In message <roy-3C4DED.09214724052009 at news.panix.com>, Roy Smith wrote:
> 
> > In article <gvb8fn$7gm$1 at lust.ihug.co.nz>,
> >  Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
> > 
> >> The right thing to do is try to ensure that all your connections are
> >> properly closed at shutdown. That may not be enough (if your server
> >> crashes due to bugs), so the other thing you need to do is retry the
> >> socket open, say, at 30-second intervals, until it succeeds.
> > 
> > That may be a reasonable thing to do for production code, but when you're
> > building and debugging a server, it's a real pain to not be able to
> > restart it quickly whenever you want (or need) to.
> 
> On the contrary, I run exactly the same logic--and that includes socket-
> handling logic--in both test and production servers. How else can I be sure 
> it'll work properly in production?

If running without SO_REUASEADDR works for you, that's great.  I was just 
pointing out how it can be useful in cases such as the OP's, where he's 
getting bind errors when he restarts his server.


From arnodel at googlemail.com  Mon May 25 07:59:59 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 25 May 2009 12:59:59 +0100
Subject: what I would like python.el to do (and maybe it does)
References: <mailman.714.1243247520.8015.python-list@python.org>
Message-ID: <m2prdx2y0w.fsf@googlemail.com>

Giovanni Gherdovich <giovanni.gherdovich at sophia.inria.fr> writes:

> Hello everybody,

Hi

> (well, it's python-send-buffer, so maybe not a single
> line but the whole buffer; the closest to my needs, anyway).
> However: I open my Emacs, issue M-x python-mode,
> then M-x run-python to have the interpreter in
> a second buffer, I type something in the
> first buffer and then C-c C-c, but nothing happens.

What platform are you on?

I use Aquamacs (which is a packaged Emacs for macos X, based on GNU
Emacs 22.3.1) and for me C-c C-c works.  It executes the content of the
current buffer in a Python interactive buffer called *Python* (which it
creates if it doesn't exist).

-- 
Arnaud


From petshmidt at googlemail.com  Mon May 25 08:10:04 2009
From: petshmidt at googlemail.com (someone)
Date: Mon, 25 May 2009 05:10:04 -0700 (PDT)
Subject: formating query with empty parameter
Message-ID: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>

Hello!

if one of parameter in values is empty, I'm getting
TypeError: not enough arguments for format string

But how to handle such situation? It is ok for DB, that some of values
are empty.



def __insert(self, data):
        query = """
            BEGIN;
                INSERT INTO table
                    (a,  b,  c,  d,  e,  f,  g)
                    VALUES
                    (%s, %s, %s, %s, %s, %s, %s);
            COMMIT;
            """
        values = [
            data['a'],
            data['b'],
            data['c'],
            data['d'],
            data['e'],
            data['f'],
            data['g']
            ]
        self.db.execute(query, *values)



Thanks Pet


From deets at nospam.web.de  Mon May 25 08:15:03 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 25 May 2009 14:15:03 +0200
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
Message-ID: <77vga0F1hgiujU1@mid.uni-berlin.de>

someone wrote:

> Hello!
> 
> if one of parameter in values is empty, I'm getting
> TypeError: not enough arguments for format string
> 
> But how to handle such situation? It is ok for DB, that some of values
> are empty.
> 
> 
> 
> def __insert(self, data):
>         query = """
>             BEGIN;
>                 INSERT INTO table
>                     (a,  b,  c,  d,  e,  f,  g)
>                     VALUES
>                     (%s, %s, %s, %s, %s, %s, %s);
>             COMMIT;
>             """
>         values = [
>             data['a'],
>             data['b'],
>             data['c'],
>             data['d'],
>             data['e'],
>             data['f'],
>             data['g']
>             ]
>         self.db.execute(query, *values)

You need to pass 

None

then as that parameter.

Diez


From petshmidt at googlemail.com  Mon May 25 08:25:16 2009
From: petshmidt at googlemail.com (Pet)
Date: Mon, 25 May 2009 05:25:16 -0700 (PDT)
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com> 
	<77vga0F1hgiujU1@mid.uni-berlin.de>
Message-ID: <eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>

On May 25, 2:15?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> someone wrote:
> > Hello!
>
> > if one of parameter in values is empty, I'm getting
> > TypeError: not enough arguments for format string
>
> > But how to handle such situation? It is ok for DB, that some of values
> > are empty.
>
> > def __insert(self, data):
> > ? ? ? ? query = """
> > ? ? ? ? ? ? BEGIN;
> > ? ? ? ? ? ? ? ? INSERT INTO table
> > ? ? ? ? ? ? ? ? ? ? (a, ?b, ?c, ?d, ?e, ?f, ?g)
> > ? ? ? ? ? ? ? ? ? ? VALUES
> > ? ? ? ? ? ? ? ? ? ? (%s, %s, %s, %s, %s, %s, %s);
> > ? ? ? ? ? ? COMMIT;
> > ? ? ? ? ? ? """
> > ? ? ? ? values = [
> > ? ? ? ? ? ? data['a'],
> > ? ? ? ? ? ? data['b'],
> > ? ? ? ? ? ? data['c'],
> > ? ? ? ? ? ? data['d'],
> > ? ? ? ? ? ? data['e'],
> > ? ? ? ? ? ? data['f'],
> > ? ? ? ? ? ? data['g']
> > ? ? ? ? ? ? ]
> > ? ? ? ? self.db.execute(query, *values)
>
> You need to pass
>
> None

Hi,

thanks for reply.
Unfortunately, it doesn't work. Still getting TypeError: not enough
arguments for format string


>
> then as that parameter.
>
> Diez



From petshmidt at googlemail.com  Mon May 25 08:45:28 2009
From: petshmidt at googlemail.com (Pet)
Date: Mon, 25 May 2009 05:45:28 -0700 (PDT)
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com> 
	<77vga0F1hgiujU1@mid.uni-berlin.de>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
Message-ID: <c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com>

On May 25, 2:25?pm, Pet <petshm... at googlemail.com> wrote:
> On May 25, 2:15?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
>
>
>
>
> > someone wrote:
> > > Hello!
>
> > > if one of parameter in values is empty, I'm getting
> > > TypeError: not enough arguments for format string
>
> > > But how to handle such situation? It is ok for DB, that some of values
> > > are empty.
>
> > > def __insert(self, data):
> > > ? ? ? ? query = """
> > > ? ? ? ? ? ? BEGIN;
> > > ? ? ? ? ? ? ? ? INSERT INTO table
> > > ? ? ? ? ? ? ? ? ? ? (a, ?b, ?c, ?d, ?e, ?f, ?g)
> > > ? ? ? ? ? ? ? ? ? ? VALUES
> > > ? ? ? ? ? ? ? ? ? ? (%s, %s, %s, %s, %s, %s, %s);
> > > ? ? ? ? ? ? COMMIT;
> > > ? ? ? ? ? ? """
> > > ? ? ? ? values = [
> > > ? ? ? ? ? ? data['a'],
> > > ? ? ? ? ? ? data['b'],
> > > ? ? ? ? ? ? data['c'],
> > > ? ? ? ? ? ? data['d'],
> > > ? ? ? ? ? ? data['e'],
> > > ? ? ? ? ? ? data['f'],
> > > ? ? ? ? ? ? data['g']
> > > ? ? ? ? ? ? ]
> > > ? ? ? ? self.db.execute(query, *values)
>
> > You need to pass
>
> > None
>
> Hi,
>
> thanks for reply.
> Unfortunately, it doesn't work. Still getting TypeError: not enough
> arguments for format string
>
>
>
>
>
> > then as that parameter.
>
> > Diez

Sorry, for previous quick post. Actually it works now, I've missed
some other parameter in list

Thanks again!


From __peter__ at web.de  Mon May 25 08:50:32 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 14:50:32 +0200
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
	<77vga0F1hgiujU1@mid.uni-berlin.de>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
Message-ID: <gve463$4gr$02$1@news.t-online.com>

Pet wrote:

> > someone wrote:
> > > Hello!
> >
> > > if one of parameter in values is empty, I'm getting
> > > TypeError: not enough arguments for format string
> >
> > > But how to handle such situation? It is ok for DB, that some of values
> > > are empty.
> >
> > > def __insert(self, data):
> > >         query = """
> > >             BEGIN;
> > >                 INSERT INTO table
> > >                     (a,  b,  c,  d,  e,  f,  g)
> > >                     VALUES
> > >                     (%s, %s, %s, %s, %s, %s, %s);
> > >             COMMIT;
> > >             """
> > >         values = [
> > >             data['a'],
> > >             data['b'],
> > >             data['c'],
> > >             data['d'],
> > >             data['e'],
> > >             data['f'],
> > >             data['g']
> > >             ]
> > >         self.db.execute(query, *values)
> >
> > You need to pass
> >
> > None
> 
> Hi,
> 
> thanks for reply.
> Unfortunately, it doesn't work. Still getting TypeError: not enough
> arguments for format string
> 

The code you posted doesn't match that error message. You have to invoke 
cursor.execute() as 

cursor.execute(query, values) # correct

, not 

cursor.execute(query, *values) # wrong

or

cursor.execute(query % values) # wrong

The length of values must match the number of "%s" occurences in the sql 
query, but as Diez indicated you may pass None for every field that allows a 
NULL value in the table.

Peter




From python.list at tim.thechases.com  Mon May 25 09:26:29 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 25 May 2009 08:26:29 -0500
Subject: formating query with empty parameter
In-Reply-To: <c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com>
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
	<77vga0F1hgiujU1@mid.uni-berlin.de>	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
	<c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com>
Message-ID: <4A1A9C85.8060908@tim.thechases.com>

>>>> if one of parameter in values is empty, I'm getting
>>>> TypeError: not enough arguments for format string
>>>> But how to handle such situation? It is ok for DB, that some of values
>>>> are empty.
>>>> def __insert(self, data):
>>>>         query = """
>>>>             BEGIN;
>>>>                 INSERT INTO table
>>>>                     (a,  b,  c,  d,  e,  f,  g)
>>>>                     VALUES
>>>>                     (%s, %s, %s, %s, %s, %s, %s);
>>>>             COMMIT;
>>>>             """
>>>>         values = [
>>>>             data['a'],
>>>>             data['b'],
>>>>             data['c'],
>>>>             data['d'],
>>>>             data['e'],
>>>>             data['f'],
>>>>             data['g']
>>>>             ]
>>>>         self.db.execute(query, *values)
> 
> Sorry, for previous quick post. Actually it works now, I've missed
> some other parameter in list

To stave off this problem, I often use:

   values = [
    data['a'],
    data['b'],
    data['c'],
    data['d'],
    data['e'],
    data['f'],
    data['g'],
    ]
   params = ', '.join('%s' for _ in values)
   query = """
     BEGIN;
       INSERT INTO table
         (a,b,c,d,e,f,g)
       VALUES (%s);
     COMMIT;
     """ % params
   self.db.execute(query, values)

If the indexes are named the same as the fieldnames, or you have 
a mapping of them, I tend to use something like

   field_map = {
     # dictionary_index: database_fieldname
     # data['a'] -> table.f1
     'a': 'f1',
     'b': 'f2',
     'c': 'f3',
     # ...
     }
   name_value_pairs = (
     (data[k], v)
     for k,v
     in fieldmap.iteritems())
   values, fieldnames = zip(*name_value_pairs)
   # may want to do fieldname escaping here:
   fieldname_string = ', '.join(fieldnames)
   params = ', '.join('%s' for _ in ordering)

   query = """
     BEGIN;
       INSERT INTO table (%s) VALUES (%s);
     COMMIT;
     """ % (fieldname_string, params)
   self.db.execute(query, values)

-tkc






From james at agentultra.com  Mon May 25 09:44:45 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 25 May 2009 09:44:45 -0400
Subject: what I would like python.el to do (and maybe it does)
References: <mailman.714.1243247520.8015.python-list@python.org>
Message-ID: <85ljolfgaa.fsf@agentultra.com>

Giovanni Gherdovich <giovanni.gherdovich at sophia.inria.fr> writes:

> Hello everybody,
>
> basically I'm writing here since I cannot
> make my python.el work (a major mode for writing
> python with emacs), but I would also like to share
> my user experience and tell you what I think
> an emacs mode should do, why do I like them
> and hopefully have some feedbacks to see if I
> misunderstood/underestimate something.
>
>
> == 1) my python.el doesn't behave very well ==
>
> I learnt somewhere
> http://www.emacswiki.org/emacs/PythonMode
> that there are two major emacs mode for python around:
> python-mode.el and python.el.
> Asking my Emacs 22.3.1 about the variable load-path
> issuing
> 'C-h v load-path RET
> I see that
> /usr/share/emacs/22.3/lisp/progmodes
> is in that path; there I find a file named
> python.elc
> which I assume to be some kind of emacs lisp bytecode
> since is pretty much unreadable.
>
> So I searched the web for a plain version of it,
> finding that the feature I use more, i.e.
> sending a line of a text file to the
> python buffer for evaluation (see below), correspond
> to the key sequence
>
> \C-c\C-c
>
> (well, it's python-send-buffer, so maybe not a single
> line but the whole buffer; the closest to my needs, anyway).
> However: I open my Emacs, issue M-x python-mode,
> then M-x run-python to have the interpreter in
> a second buffer, I type something in the
> first buffer and then C-c C-c, but nothing happens.
>
> Am I missing something?
> Do I have any hope of having some sort of
> send-line-to-python-buffer function working?
>
>
> == 2) How do I use emacs modes for interpreted languages ==
>
> Please note that what follows is just the personal perspective
> of an unexperienced user.
>
> Syntax highlighting is a great thing, but is not as critical
> to me as the feature I describe below.
>
> When I work with interpreted languages, I really hate doing it
> in the shell; after 20 commands I easily lose control on
> what happens and on which definitions are around.
>
> I use Emacs instead, so that I can have two buffers; in the
> first I type my expressions, in the second I evaluate them
> using some key bindings so that I can easily send the text
> from the first buffer to the second one line by line.
>
> In this way I can easily refactor my code, and eventually package it
> in a script if I like.
> Usually after a while the intepreter buffer is a big mess,
> so I restart it but my code is safe and sound in the first buffer.
>
> To do so, I don't really need a major mode, I admit; I just need
> to put the following code in my .emacs:
>
> (fset 'send-line-other-window
>  [?\C-a ?\C- ?\C-e ?M-w right
>   ?C-x ?o ?C-y return ?\C-x ?o])
> (global-set-key [f11] 'send-line-other-window)
>
> Then I open emacs, C-x 2 to have a second buffer,
> C-x o to switch to it and M-x shell to run bash in it.
> Then, in the case of python, I run "python" in the
> bash buffer. Then I type my code in the first and with F11
> I send lines to the interpreter.
>
> But since i like to do it The Right Way, I would
> like to let the python-mode worry about this...
>
> Sorry if this is just a bunch of obvious thoughts to most of you.
>
> Regards,
> Giovanni

I find that it does work, but unlike SLIME for lisp, it just imports the statement.

It confused me at first, but basically the interpreter doesn't provide
any feedback to emacs.

Try opening a python source file (start python-mode if you don't have
an autoload hook) and do C-c C-z to bring up the Python
interpreter. Type in a simple assignment statement (like "a = 1 + 2"
without the quotes) into the source file. Then just C-c C-c as
usual. I never get any feedback. Just C-x o to the interpreter and
print out the variable you just defined. It should be there.


From davea at ieee.org  Mon May 25 10:06:17 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 25 May 2009 10:06:17 -0400
Subject: writing on file not until the end
In-Reply-To: <fdde3592-6741-416b-8904-d659c91dfb42@3g2000yqk.googlegroups.com>
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>	<gvdec2$uu1$01$1@news.t-online.com>	<2264b63d-1ab5-4773-8b2c-4fdfb574c7b9@z5g2000yqn.googlegroups.com>	<e6727293-bbc4-4977-93c5-44dde89a8929@d19g2000prh.googlegroups.com>
	<fdde3592-6741-416b-8904-d659c91dfb42@3g2000yqk.googlegroups.com>
Message-ID: <4A1AA5D9.1010501@ieee.org>

Alessandro wrote:
> <snip>
>
> I closed and restarted the python console. Now this code (with added
> "Nfile.close()" at the end) seems to work properly:
>
> linestring = open(path, 'r').read()
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1]
> Nfile = open("N.txt", "w")
> Nfile.write(textN)
> Nfile.close()
>
> thanks, Alex
>
>   
Others had already mentioned close(), but I didn't bother, since it 
would be automatically closed when you exited the function, or finished 
the script.  I never dreamed you were running all this from the 
interpreter.  If so, why didn't you copy the prompts?

The close is best done explicitly, but it is implicit when the Nfile 
goes out of scope, or gets reassigned (like the new open).

However, the bug I described is still there.  Study the following, and 
try it:

def test():
    buf = "abcdefghijklmnopqrstg000"
    i = buf.index("d")
    e = buf.index("g", i+10)
    buf2 = buf[i+2:e-1]
    print buf2

running it produces the string:

fghijklmnopqrs

Notice the 't' is missing.  If you're deliberately doing that, fine.  
But I doubt it.





From jaime.frio at gmail.com  Mon May 25 10:07:13 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Mon, 25 May 2009 16:07:13 +0200
Subject: exec statement with/without prior compile...
Message-ID: <97a8f1a70905250707m413e428ei63494285248d0afa@mail.gmail.com>

These weekend I've been tearing down to pieces Michele Simionato's
decorator module, that builds signature preserving decorators. At the
heart of it all there is a dynamically generated function, which works
something similar to this...

...
    src = """def function(a,b,c) :\n    return _caller_(a,b,c)\n"""
    evaldict = {'_caller_' : _caller_}
    code = compile(src, '<string>', 'single')
    exec code in evaldict
    new_func = evaldict[function]
...

I have found fooling around with this code, that the compile step can
be completely avoided and go for a single:

    exec src in evaldict

Now, I'm sure there is a good reason for that additional step, but I
haven't been able to find what the difference between both approaches
is.

And since I'm asking, could something similar, i.e. defining a new
function and get a handle to it, be achieved with eval?

Thanks in advance,

Jaime Fern?ndez
http://numericalrecipes.blogspot.com

-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From piet at cs.uu.nl  Mon May 25 10:09:41 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Mon, 25 May 2009 16:09:41 +0200
Subject: Need Help
References: <5f238e07-8d39-4bb4-8c6a-cbd56412fb5a@c36g2000yqn.googlegroups.com>
	<m2y6sm6tak.fsf@cs.uu.nl>
	<pan.2009.05.25.02.39.37@REMOVE.THIS.cybersource.com.au>
	<7f5b3761-ff6c-4448-81da-a0bc2eced6c9@l12g2000yqo.googlegroups.com>
Message-ID: <m2skit6zq2.fsf@cs.uu.nl>

>>>>> abosalim <mohammed.abosalim at gmail.com> (a) wrote:

>a> I modified the method,but it can't identified it.(self.res=textcorrect
>a> (self.string)
>a> NameError: global name 'textcorrect' is not defined)
>a> This is what i done:

[...]
>a> class Ex3:
[...]
>a>     def textcorrect(str):
>a>         s=[]
>a>         for i in tokenize.whitespace(str):
>a>             s.append(correct(i))
>a>             result= " ".join(s)
>a>             return result
>a>     def new(self):
>a>         self.string = self.contents.get()
>a>         #pass contents of textfield to textcorrect()method above
>a>         self.res=textcorrect(self.string)
>a>         self.frame2 = Frame()
>a>         self.frame2.pack()
>a>         self.words = Label(self.frame2, text=self.res, fg="blue", font=
>a> ("Arial", 16))
>a>         self.words.pack()

So now you have put textcorrect inside the class Ex3. But that means
that it is an instance method now. So you need to call 
     self.textcorrect(self.string) 
otherwise it is not known. But then you must also give it a self
parameter. The same applies to the other methods, so in textcorrect you
have to call self.correct(i)  and give correct a self parameter. etc.

Or you make them all static methods and use Ex3.textcorrect().

I don't think putting all the methods in a class is a good idea, as you
only need one instance of it and most methods are static-like anyway.
Putting it in a class is a Java-ism. A module for this is more Pythonic.

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From piet at cs.uu.nl  Mon May 25 10:12:22 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Mon, 25 May 2009 16:12:22 +0200
Subject: Can I get a technical explanation on the following error
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
	<4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>
	<1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
	<mailman.679.1243200974.8015.python-list@python.org>
	<4a1a1084$0$19026$4c5ecfc7@fe1.usenet.com>
Message-ID: <m2my916zll.fsf@cs.uu.nl>

>>>>> Jim Garrison <jhg at acm.org> (JG) wrote:

>JG> And as an interesting exercise, try
>JG> print r'test \'
>JG> print r'test \\'

>JG> Because of the way raw string parsing is defined, neither of these will
>JG> pass the parser.  In fact, a raw string cannot have a backslash as
>JG> its last character.

Cannot have an odd number of backslashes as its last characters.

>>> print r'test \\'
test \\
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From Roland.Puntaier at br-automation.com  Mon May 25 10:43:26 2009
From: Roland.Puntaier at br-automation.com (Roland Puntaier)
Date: Mon, 25 May 2009 16:43:26 +0200
Subject: [ANN] vim patch to support python3 interface
In-Reply-To: <4A1548A1.1040101@gmail.com>
Message-ID: <OFFBD29A21.3489DD39-ONC12575C1.004F291B-C12575C1.0050DFE4@br-automation.com>

vim_use at googlegroups.com schrieb am 21.05.2009 14:27:13:

> 
> On 12/05/09 18:35, Roland Puntaier wrote:
> > Hello,
> >
> > I have ported vim's python interface (if_python.c) to the python3 
C-API.
> >
> > The changed files are:
> > - Makefile (for linux)
> > - Make_mvc.mak (for windows)
> > - if_python3.c is a new file for the python3 related sources. it is 
based
> > on if_python.c.
> >
> > All of them are in the ``src`` subdirectory.
> [...]
> 
> Make_mvc.mak is not, and by far, the only makefile used by people who 
> build Vim on Windows.
> [...]

My solution regarding the build process is rather provisionary.
I'll work out a solution that encompasses all makefiles.

I'll send a follow-up.

Best regards,
        Roland



From Ron.Barak at lsi.com  Mon May 25 10:52:22 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Mon, 25 May 2009 15:52:22 +0100
Subject: How to pickle a 'PySwigObject' ?
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A2527@enbmail01.lsi.com>

Hi,

I have a wxPython application that is creating a subprocess that performs a lengthy log analysis.
Currently, the subprocess is displaying its results using its own MainLoop().
I want to display the subprocess' results using the parent process' MainLoop().

I tried to pickle the class instance that is displaying the subprocess results (so the subclass could be sent to the parent process for display), but I get the following error:

cPickle.PicklingError: Can't pickle <type 'PySwigObject'>: attribute lookup __builtin__.PySwigObject failed
A code that demonstrate the problem is:

$ cat pickle_test.py
#!/usr/bin/env python

#import pickle
import cPickle as pickle
import wx

class ListControl(wx.Frame):

    def __init__(self, parent, id):
        wx.Frame.__init__(self,parent,id)

if __name__ == "__main__":

    app = wx.App(redirect=False)
    output = pickle.dumps(ListControl(None, -1),2)

Any ideas what could be changed to let me pickle the class ?

Thanks,
Ron.

$ cat -n pickle_test.py
     1  #!/usr/bin/env python
     2
     3  #import pickle
     4  import cPickle as pickle
     5  import wx
     6
     7  class ListControl(wx.Frame):
     8
     9      def __init__(self, parent, id):
    10          wx.Frame.__init__(self,parent,id)
    11
    12  if __name__ == "__main__":
    13
    14      app = wx.App(redirect=False)
    15      output = pickle.dumps(ListControl(None, -1),2)

$ python -u pickle_test.py
Traceback (most recent call last):
  File "pickle_test.py", line 15, in <module>
    output = pickle.dumps(ListControl(None, -1),2)
cPickle.PicklingError: Can't pickle <type 'PySwigObject'>: attribute lookup __builtin__.PySwigObject failed

$
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From petshmidt at googlemail.com  Mon May 25 10:53:06 2009
From: petshmidt at googlemail.com (Pet)
Date: Mon, 25 May 2009 07:53:06 -0700 (PDT)
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com> 
	<77vga0F1hgiujU1@mid.uni-berlin.de>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
	<gve463$4gr$02$1@news.t-online.com>
Message-ID: <edb8840a-136a-497a-92b2-42b533020bba@m19g2000yqk.googlegroups.com>

On May 25, 2:50?pm, Peter Otten <__pete... at web.de> wrote:
> Pet wrote:
> > > someone wrote:
> > > > Hello!
>
> > > > if one of parameter in values is empty, I'm getting
> > > > TypeError: not enough arguments for format string
>
> > > > But how to handle such situation? It is ok for DB, that some of values
> > > > are empty.
>
> > > > def __insert(self, data):
> > > > ? ? ? ? query = """
> > > > ? ? ? ? ? ? BEGIN;
> > > > ? ? ? ? ? ? ? ? INSERT INTO table
> > > > ? ? ? ? ? ? ? ? ? ? (a, ?b, ?c, ?d, ?e, ?f, ?g)
> > > > ? ? ? ? ? ? ? ? ? ? VALUES
> > > > ? ? ? ? ? ? ? ? ? ? (%s, %s, %s, %s, %s, %s, %s);
> > > > ? ? ? ? ? ? COMMIT;
> > > > ? ? ? ? ? ? """
> > > > ? ? ? ? values = [
> > > > ? ? ? ? ? ? data['a'],
> > > > ? ? ? ? ? ? data['b'],
> > > > ? ? ? ? ? ? data['c'],
> > > > ? ? ? ? ? ? data['d'],
> > > > ? ? ? ? ? ? data['e'],
> > > > ? ? ? ? ? ? data['f'],
> > > > ? ? ? ? ? ? data['g']
> > > > ? ? ? ? ? ? ]
> > > > ? ? ? ? self.db.execute(query, *values)
>
> > > You need to pass
>
> > > None
>
> > Hi,
>
> > thanks for reply.
> > Unfortunately, it doesn't work. Still getting TypeError: not enough
> > arguments for format string
>
> The code you posted doesn't match that error message. You have to invoke
> cursor.execute() as
>
> cursor.execute(query, values) # correct
>
> , not
>
> cursor.execute(query, *values) # wrong

as far as I know it is not wrong, at least for pyPgSQL it takes values
and escapes properly preventing sql injections

>
> or
>
> cursor.execute(query % values) # wrong
>
> The length of values must match the number of "%s" occurences in the sql
> query, but as Diez indicated you may pass None for every field that allows a
> NULL value in the table.
>
> Peter



From petshmidt at googlemail.com  Mon May 25 10:54:12 2009
From: petshmidt at googlemail.com (Pet)
Date: Mon, 25 May 2009 07:54:12 -0700 (PDT)
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com> 
	<77vga0F1hgiujU1@mid.uni-berlin.de>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
	<c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com> 
	<mailman.717.1243258005.8015.python-list@python.org>
Message-ID: <c7508c6f-8723-4e9d-ae32-55ce9a42404e@e21g2000yqb.googlegroups.com>

On May 25, 3:26?pm, Tim Chase <python.l... at tim.thechases.com> wrote:
> >>>> if one of parameter in values is empty, I'm getting
> >>>> TypeError: not enough arguments for format string
> >>>> But how to handle such situation? It is ok for DB, that some of values
> >>>> are empty.
> >>>> def __insert(self, data):
> >>>> ? ? ? ? query = """
> >>>> ? ? ? ? ? ? BEGIN;
> >>>> ? ? ? ? ? ? ? ? INSERT INTO table
> >>>> ? ? ? ? ? ? ? ? ? ? (a, ?b, ?c, ?d, ?e, ?f, ?g)
> >>>> ? ? ? ? ? ? ? ? ? ? VALUES
> >>>> ? ? ? ? ? ? ? ? ? ? (%s, %s, %s, %s, %s, %s, %s);
> >>>> ? ? ? ? ? ? COMMIT;
> >>>> ? ? ? ? ? ? """
> >>>> ? ? ? ? values = [
> >>>> ? ? ? ? ? ? data['a'],
> >>>> ? ? ? ? ? ? data['b'],
> >>>> ? ? ? ? ? ? data['c'],
> >>>> ? ? ? ? ? ? data['d'],
> >>>> ? ? ? ? ? ? data['e'],
> >>>> ? ? ? ? ? ? data['f'],
> >>>> ? ? ? ? ? ? data['g']
> >>>> ? ? ? ? ? ? ]
> >>>> ? ? ? ? self.db.execute(query, *values)
>
> > Sorry, for previous quick post. Actually it works now, I've missed
> > some other parameter in list
>
> To stave off this problem, I often use:
>
> ? ?values = [
> ? ? data['a'],
> ? ? data['b'],
> ? ? data['c'],
> ? ? data['d'],
> ? ? data['e'],
> ? ? data['f'],
> ? ? data['g'],
> ? ? ]
> ? ?params = ', '.join('%s' for _ in values)
> ? ?query = """
> ? ? ?BEGIN;
> ? ? ? ?INSERT INTO table
> ? ? ? ? ?(a,b,c,d,e,f,g)
> ? ? ? ?VALUES (%s);
> ? ? ?COMMIT;
> ? ? ?""" % params
> ? ?self.db.execute(query, values)
>

Why do you pass values to execute() if you already have your query
formatted?

> If the indexes are named the same as the fieldnames, or you have
> a mapping of them, I tend to use something like
>
> ? ?field_map = {
> ? ? ?# dictionary_index: database_fieldname
> ? ? ?# data['a'] -> table.f1
> ? ? ?'a': 'f1',
> ? ? ?'b': 'f2',
> ? ? ?'c': 'f3',
> ? ? ?# ...
> ? ? ?}
> ? ?name_value_pairs = (
> ? ? ?(data[k], v)
> ? ? ?for k,v
> ? ? ?in fieldmap.iteritems())
> ? ?values, fieldnames = zip(*name_value_pairs)
> ? ?# may want to do fieldname escaping here:
> ? ?fieldname_string = ', '.join(fieldnames)
> ? ?params = ', '.join('%s' for _ in ordering)
>
> ? ?query = """
> ? ? ?BEGIN;
> ? ? ? ?INSERT INTO table (%s) VALUES (%s);
> ? ? ?COMMIT;
> ? ? ?""" % (fieldname_string, params)
> ? ?self.db.execute(query, values)
>
> -tkc



From petshmidt at googlemail.com  Mon May 25 11:39:07 2009
From: petshmidt at googlemail.com (someone)
Date: Mon, 25 May 2009 08:39:07 -0700 (PDT)
Subject: unicode confusing
Message-ID: <ac50a990-d612-4ee2-931d-a07ecf98056e@37g2000yqp.googlegroups.com>

Hi,

reading content of webpage (encoded in utf-8) with urllib2, I can't
get parsed data into DB

Exception:

  File "/usr/lib/python2.5/site-packages/pyPgSQL/PgSQL.py", line 3111,
in execute
    raise OperationalError, msg
libpq.OperationalError: ERROR:  invalid UTF-8 byte sequence detected
near byte 0xe4

I've already checked several python unicode tutorials, but I have no
idea how to solve my problem.

Appreciating your help
Pet


From ptmcg at austin.rr.com  Mon May 25 12:04:10 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Mon, 25 May 2009 09:04:10 -0700 (PDT)
Subject: I need help building a data structure for a state diagram
References: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>
Message-ID: <6844f422-be3e-4c11-b4e5-f0b0a909ba12@k38g2000yqh.googlegroups.com>

On May 24, 1:16?pm, Matthew Wilson <m... at tplus1.com> wrote:
> I'm working on a really simple workflow for my bug tracker. ?I want
> filed bugs to start in an UNSTARTED status. ?From there, they can go to
> STARTED.
>

I just wrote an article for the April issue of Python Magazine on how
to add embedded DSL code to your Python scripts using Python's imputil
module, and I used a state pattern for my example.  Two state machine
examples I used to illustrate the work were a traffic light and a
library book checkin/checkout.  The traffic light state machine is
just a simple cycle through the 3 light states.  But the library book
state machine is more complex (your bug tracking example made me think
of it), with different transitions allowed one state into multiple
different states.  Here is how the code looks for these examples:

==============
# trafficLight.pystate
statemachine TrafficLight:
    Red -> Green
    Green -> Yellow
    Yellow -> Red

Red.carsCanGo    = False
Yellow.carsCanGo = True
Green.carsCanGo  = True

# ... other class definitions for state-specific behavior ...

==============
# trafficLightDemo.py

# add support for .pystate files, with
# embedded state machine DSL
import stateMachine

import trafficLight

tlight = trafficLight.Red()
while 1:
    print tlight, "GO" if tlight.carsCanGo else "STOP"
    tlight.delay()
    tlight = tlight.next_state()


==============
# libraryBook.pystate

statemachine BookCheckout:
    New       -(create)->   Available
    Available -(reserve)->  Reserved
    Available -(checkout)-> CheckedOut
    Reserved  -(cancel)->   Available
    Reserved  -(checkout)-> CheckedOut
    CheckedOut -(checkin)->  Available
    CheckedOut -(renew)->   CheckedOut


You don't need to adopt this whole DSL implementation, but the article
might give you some other ideas.

-- Paul


From paul at boddie.org.uk  Mon May 25 12:07:42 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Mon, 25 May 2009 09:07:42 -0700 (PDT)
Subject: unicode confusing
References: <ac50a990-d612-4ee2-931d-a07ecf98056e@37g2000yqp.googlegroups.com>
Message-ID: <bd608c8b-be06-46ee-ac96-011e0e8db717@c9g2000yqm.googlegroups.com>

On 25 Mai, 17:39, someone <petshm... at googlemail.com> wrote:
> Hi,
>
> reading content of webpage (encoded in utf-8) with urllib2, I can't
> get parsed data into DB
>
> Exception:
>
> ? File "/usr/lib/python2.5/site-packages/pyPgSQL/PgSQL.py", line 3111,
> in execute
> ? ? raise OperationalError, msg
> libpq.OperationalError: ERROR: ?invalid UTF-8 byte sequence detected
> near byte 0xe4
>
> I've already checked several python unicode tutorials, but I have no
> idea how to solve my problem.

With pyPgSQL, there are a few tricks that you have to take into
account:

1. With PostgreSQL, it would appear advantageous to create databases
using the "-E unicode" option.

2. When connecting, use the client_encoding and unicode_results
arguments for the connect function call:

  connection = PgSQL.connect(client_encoding="utf-8",
unicode_results=1)

3. After connecting, it appears necessary to set the client encoding
explicitly:

  connection.cursor().execute("set client_encoding to unicode")

I'd appreciate any suggestions which improve on the above, but what
this should allow you to do is to present Unicode objects to the
database and to receive such objects from queries. Whether you can
relax this and pass UTF-8-encoded strings instead of Unicode objects
is not something I can guarantee, but it's usually recommended that
you manipulate Unicode objects in your program where possible, and
here you should be able to let pyPgSQL deal with the encodings
preferred by the database.

Paul


From python.list at tim.thechases.com  Mon May 25 12:16:48 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 25 May 2009 11:16:48 -0500
Subject: formating query with empty parameter
In-Reply-To: <c7508c6f-8723-4e9d-ae32-55ce9a42404e@e21g2000yqb.googlegroups.com>
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
	<77vga0F1hgiujU1@mid.uni-berlin.de>	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>	<c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com>
	<mailman.717.1243258005.8015.python-list@python.org>
	<c7508c6f-8723-4e9d-ae32-55ce9a42404e@e21g2000yqb.googlegroups.com>
Message-ID: <4A1AC470.5080105@tim.thechases.com>

>> To stave off this problem, I often use:
>>
>>    values = [
>>     data['a'],
>>     data['b'],
>>     data['c'],
>>     data['d'],
>>     data['e'],
>>     data['f'],
>>     data['g'],
>>     ]
>>    params = ', '.join('%s' for _ in values)
>>    query = """
>>      BEGIN;
>>        INSERT INTO table
>>          (a,b,c,d,e,f,g)
>>        VALUES (%s);
>>      COMMIT;
>>      """ % params
>>    self.db.execute(query, values)
>>
> 
> Why do you pass values to execute() if you already have your query
> formatted?

The "params" might be better named "placeholders".  So after the

    query = "..." % params

the query looks like your original (go ahead and print "query" to 
see), only the number of placeholders ("%s") is guaranteed to 
match the number of values you pass in during the execute() call. 
  The second iteration I gave goes one step further to ensure 
that the "(a,b,c,d,e,f,g)" portion also matches in count to the 
number of values and place-holders to be used.

Once you have a SQL query that matches what you plan to pass 
(based on your initial data-structure:  a list/tuple or a 
dictionary), then you call execute(query, values) to have the 
database then associate the parameter-placeholders ("%s") with 
the corresponding value from "values".

-tkc




From a.cavallo at mailsnare.com  Mon May 25 12:25:09 2009
From: a.cavallo at mailsnare.com (A. Cavallo)
Date: Mon, 25 May 2009 17:25:09 +0100
Subject: Searching for pyvm
In-Reply-To: <4A19D61D.6020409@acm.org>
References: <4A19D61D.6020409@acm.org>
Message-ID: <200905251725.10172.a.cavallo@mailsnare.com>

http://students.ceid.upatras.gr/~sxanth/pyvm/

Does this help?
Regards,
Antonio

On Monday 25 May 2009 00:19:57 Vladimir G. Ivanovic wrote:
> Hello,
>
> I'm looking for the sources to pyvm, a python virtual machine
> implementation which can run Python 2.4 bytecode.
>
> If someone could point me in the right direction, I would appreciate it.
>
> Thanks.
>
> --- Vladimir
>
> P.S. The link on the author's pyvm page is broken, and I have been
> unable to find a copy elsewhere (Google, FTP servers, All-the-Web
> search, etc.)



From __peter__ at web.de  Mon May 25 12:45:26 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 18:45:26 +0200
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
	<77vga0F1hgiujU1@mid.uni-berlin.de>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
	<gve463$4gr$02$1@news.t-online.com>
	<edb8840a-136a-497a-92b2-42b533020bba@m19g2000yqk.googlegroups.com>
Message-ID: <gvehuh$js1$00$1@news.t-online.com>

Pet wrote:

> On May 25, 2:50 pm, Peter Otten <__pete... at web.de> wrote:

>> cursor.execute(query, *values) # wrong
> 
> as far as I know it is not wrong, at least for pyPgSQL it takes values
> and escapes properly preventing sql injections

If so replace "# wrong" with "# superfluous" ;)

Peter



From petshmidt at googlemail.com  Mon May 25 13:17:44 2009
From: petshmidt at googlemail.com (Pet)
Date: Mon, 25 May 2009 10:17:44 -0700 (PDT)
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com> 
	<77vga0F1hgiujU1@mid.uni-berlin.de>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
	<c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com> 
	<mailman.717.1243258005.8015.python-list@python.org>
	<c7508c6f-8723-4e9d-ae32-55ce9a42404e@e21g2000yqb.googlegroups.com>
	<mailman.724.1243268217.8015.python-list@python.org>
Message-ID: <f2152a7e-eb88-4f99-b84f-b31902e2ef52@r37g2000yqd.googlegroups.com>

On 25 Mai, 18:16, Tim Chase <python.l... at tim.thechases.com> wrote:
> >> To stave off this problem, I often use:
>
> >> ? ?values = [
> >> ? ? data['a'],
> >> ? ? data['b'],
> >> ? ? data['c'],
> >> ? ? data['d'],
> >> ? ? data['e'],
> >> ? ? data['f'],
> >> ? ? data['g'],
> >> ? ? ]
> >> ? ?params = ', '.join('%s' for _ in values)
> >> ? ?query = """
> >> ? ? ?BEGIN;
> >> ? ? ? ?INSERT INTO table
> >> ? ? ? ? ?(a,b,c,d,e,f,g)
> >> ? ? ? ?VALUES (%s);
> >> ? ? ?COMMIT;
> >> ? ? ?""" % params
> >> ? ?self.db.execute(query, values)
>
> > Why do you pass values to execute() if you already have your query
> > formatted?
>
> The "params" might be better named "placeholders". ?So after the

O, thanks for clarification, I've completely missed the point of
params = ', '.join
>
> ? ? query = "..." % params
>
> the query looks like your original (go ahead and print "query" to
> see), only the number of placeholders ("%s") is guaranteed to
> match the number of values you pass in during the execute() call.
> ? The second iteration I gave goes one step further to ensure
> that the "(a,b,c,d,e,f,g)" portion also matches in count to the
> number of values and place-holders to be used.
>
> Once you have a SQL query that matches what you plan to pass
> (based on your initial data-structure: ?a list/tuple or a
> dictionary), then you call execute(query, values) to have the
> database then associate the parameter-placeholders ("%s") with
> the corresponding value from "values".
>
> -tkc



From seattlehanks at yahoo.com  Mon May 25 13:29:40 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Mon, 25 May 2009 10:29:40 -0700 (PDT)
Subject: from __future__ import absolute_import issue
References: <1aeb486c-eef8-453c-8d04-fd831a84f8e2@g22g2000pra.googlegroups.com>
	<mailman.562.1242978117.8015.python-list@python.org>
	<5d6c964f-8973-4aef-9b86-fa8b3f6855d7@f37g2000pro.googlegroups.com>
	<mailman.647.1243129181.8015.python-list@python.org>
Message-ID: <c4ff04be-5969-4236-a032-91f6411dc494@i28g2000prd.googlegroups.com>

On May 23, 6:39?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Sat, 23 May 2009 12:32:24 -0300, LittleGrasshopper ?
> <seattleha... at yahoo.com> escribi?:
>
>
>
> > On May 22, 12:42?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> > wrote:
> >> En Wed, 20 May 2009 20:18:02 -0300, LittleGrasshopper ?
> >> <seattleha... at yahoo.com> escribi?:
>
> >> > It appears that either absolute imports (or my brain) aren't working.
> >> > Given a module string.py which is in the same directory as a.py:
>
> >> > #File a.py
> >> > from __future__ importabsolute_import
> >> > import string
> >> > print string # Module imported is string.py in current directory, not
> >> > standard library module
>
> >>absolute_importhelps with imports inside a package (those are ?
> >> "relative" ?
> >> imports, relative to the package). If a module is located in a ?
> >> directory ?
> >> listed in sys.path, an absolute import will find it. I don't think ?
> >> there ?
> >> is a way to avoid shadowing a standard module (other than ensuring the ?
> >> standard directories come first in sys.path).
>
> > You are right. If you have a directory in your PYTHONPATH before the
> > standard library directories that has a string module, for example,
> >absolute_importwill not help you. I was getting confused by the fact
> > that when I print sys.path from the python shell, the first entry is
> > an empty string.
> > This empty string must denote the current directory though, because:
>
> > ['', '/usr/lib/python25.zip', '/usr/lib/python2.5', '/usr/lib/ ...]
>
> > When I have this sys.path, doing an "import string" from a module
> > where I have absolute imports enabled will still import the string
> > module in the package (which also means it is in the same directory in
> > this case.)
>
> Mmm, I don't understand this. Do you mean that the current directory is a ?
> package (that is, it contains an __init__.py file? And the main script is ?
> there? Then, from Python's POV, it is NOT a package; packages are ?
> recognized only at import time; if you execute a script that happens to be ?
> inside a package directory, Python is not aware of the "packageness" of ?
> such directory.
> In that case, all imports are absolute.
> The current directory should not be a package (at least, not a package ?
> accessible from sys.path), nasty things may happen.
>
> > So I think my string.py is being imported not because it
> > is in the same package, but because the home directory is searched
> > first.
>
> Yes.
>
> > The empty string doesn't make much sense though (at least in a
> > Unix system, you would imagine it would be something like './') but I
> > guess that synce Python is platform independent, the empty string is
> > taken to denote the current directory.
>
> Maybe you're surprised, but I don't think it's strange at all. Nobody ?
> writes open("./foo.txt") instead of open("foo.txt"), and ?
> os.path.normpath("./foo.txt") is actually "foo.txt". Having no path ?
> specification means "use the current directory" (at least in all OS that I ?
> know of, where "process' current directory" makes any sense)
>
> --
> Gabriel Genellina

Thank you for the insightful discussion, Gabriel. I was conducting
some testing with serious flaws. I think you have pointed the problem
exactly. What I was doing is: I had a directory with an __init__.py
file on it, and inside I had a test module, plus a string.py module.
My test was flawed because what I was doing is starting a python shell
from the directory in question, and then importing the test module in
the shell. I was expecting that when string was imported from within
the test module (in which I was using absolute_import) the standard
string module would be imported, but the string module in the same
package was being imported instead. The key is that it was being
imported not because it was in the same package, but because it was in
the home (current) directory. I think that explains everything, let me
know if you see any flaw in my reasoning.

And I agree with you about the current directory being denoted by an
empty string being expected. My mind was a little warped at the moment
I wrote that.


From seattlehanks at yahoo.com  Mon May 25 13:35:03 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Mon, 25 May 2009 10:35:03 -0700 (PDT)
Subject: What text editor is everyone using for Python
Message-ID: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>

With so many choices, I was wondering what editor is the one you
prefer when coding Python, and why. I normally use vi, and just got
into Python, so I am looking for suitable syntax files for it, and
extra utilities. I dabbled with emacs at some point, but couldn't get
through the key bindings for commands. I've never tried emacs with vi
keybindings (I forgot the name of it) but I've been tempted.

So what do you guys use, and why? Hopefully we can keep this civil.


From mal at egenix.com  Mon May 25 13:41:54 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Mon, 25 May 2009 19:41:54 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A107988.3020202@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>
Message-ID: <4A1AD862.6090100@egenix.com>

Martin v. L?wis wrote:
> Thomas Wouters reminded me of a long-standing idea; I finally
> found the time to write it down.
> 
> Please comment!
> ...
>

Up until this PEP proposal, we had a very simple scheme for
the Python C-API: all documented functions and variables with
a "Py" prefix were part of the C-API, everything else was not
and could change between releases (in particular the private
"_Py" prefix APIs).

Changing the published APIs was considered a bad thing in the
2.x development process and generally required a good reason
to get supported.

Changing private functions or ones that were not documented
was generally never a big problem.

Now, with the PEP, I have a feeling that the Python C-API
will in effect be limited to what's in the PEP's idea of
a usable ABI and open up the non-inluded public C-APIs
to the same rate of change as the private APIs.

If that's the case, the PEP should be discussed on the C-API
list first, in order to identify a complete list of APIs that
is supposed to define the Python C-API. Ideally, all other
APIs would then need to be made private. However, I doubt that
this is possible before switching to Python 4.0.

Then again, I'm not sure whether that's what you're aiming for...

An optional cross-version ABI would certainly be a good thing.

Limiting the Python C-API would be counterproductive.

> During the compilation of applications, the preprocessor macro
> Py_LIMITED_API must be defined. Doing so will hide all definitions
> that are not part of the ABI.

So extensions wanting to use the full Python C-API as documented
in the C-API docs will still be able to do this, right ?

> Type Objects
> ------------
> 
> The structure of type objects is not available to applications;
> declaration of "static" type objects is not possible anymore
> (for applications using this ABI).

Hmm, that's going to create big problems for extensions that
want to expose a C-API for their types: Type checks are normally
done by pointer comparison using those static type objects.

> Functions and function-like Macros
> ----------------------------------
> 
> Function-like macros (in particular, field access macros) remain
> available to applications, but get replaced by function calls
> (unless their definition only refers to features of the ABI, such
> as the various _Check macros)

Including Py_INCREF()/Py_DECREF() ?

> Excluded Functions
> ------------------
> 
> Functions declared in the following header files are not part
> of the ABI:
> - cellobject.h
> - classobject.h
> - code.h
> - frameobject.h
> - funcobject.h
> - genobject.h
> - pyarena.h
> - pydebug.h
> - symtable.h
> - token.h
> - traceback.h

I don't think that's feasable: you basically remove all introspection
functions that way.

This will need a more fine-grained approach.

> Linkage
> -------
> 
> On Windows, applications shall link with python3.dll;

You mean: extensions that were compiled with Py_LIMITED_API, right ?

> an import
> library python3.lib will be available. This DLL will redirect all of
> its API functions through /export linker options to the full
> interpreter DLL, i.e. python3y.dll.

What if you mix extensions that use the full C-API with ones
that restrict themselves to the limited version ?

Would creating a Python object in a full-API extension and
free'ing it in a limited-API extension cause problems ?

> Implementation Strategy
> =======================
> 
> This PEP will be implemented in a branch, allowing users to check
> whether their modules conform to the ABI. To simplify this testing, an
> additional macro Py_LIMITED_API_WITH_TYPES will expose the existing
> type object layout, to let users postpone rewriting all types. When
> the this branch is merged into the 3.2 code base, this macro will
> be removed.

Now I'm confused again: this sounds a lot like you do want all extension
writers to only use the limited API.

[And in another post]
>> Something I haven't seen explicitly mentioned as yet (in the PEP or the
>> > python-dev list discussion) are the memory management APIs and the FILE*
>> > APIs which can cause the MSVCRT versioning issues on Windows.
>> > 
>> > Those would either need to be excluded from the stable ABI or else
>> > changed to use opaque pointers.
> 
> Good point. As a separate issue, I would actually like to deprecate,
> then remove these APIs. I had originally hoped that this would happen
> for 3.0 already, alas, nobody worked on it.
> 
> In any case, I have removed them from the ABI now.

How do you expect Python extensions to allocate memory and objects
in a platform independent way without those APIs ?

And as an aside: Which API families are you referring to ? PyMem_Malloc,
PyObject_Malloc, or PyObject_New ?

Thanks,
-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, May 25 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________
2009-06-29: EuroPython 2009, Birmingham, UK                34 days to go

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From james at agentultra.com  Mon May 25 13:44:37 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 25 May 2009 13:44:37 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <85hbz9f56i.fsf@agentultra.com>

LittleGrasshopper <seattlehanks at yahoo.com> writes:

> With so many choices, I was wondering what editor is the one you
> prefer when coding Python, and why. I normally use vi, and just got
> into Python, so I am looking for suitable syntax files for it, and
> extra utilities. I dabbled with emacs at some point, but couldn't get
> through the key bindings for commands. I've never tried emacs with vi
> keybindings (I forgot the name of it) but I've been tempted.
>
> So what do you guys use, and why? Hopefully we can keep this civil.

Google should provide you with millions of responses.


From seattlehanks at yahoo.com  Mon May 25 13:57:20 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Mon, 25 May 2009 10:57:20 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
Message-ID: <35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>

On May 25, 10:44?am, J Kenneth King <ja... at agentultra.com> wrote:
> LittleGrasshopper <seattleha... at yahoo.com> writes:
> > With so many choices, I was wondering what editor is the one you
> > prefer when coding Python, and why. I normally use vi, and just got
> > into Python, so I am looking for suitable syntax files for it, and
> > extra utilities. I dabbled with emacs at some point, but couldn't get
> > through the key bindings for commands. I've never tried emacs with vi
> > keybindings (I forgot the name of it) but I've been tempted.
>
> > So what do you guys use, and why? Hopefully we can keep this civil.
>
> Google should provide you with millions of responses.

I know Google (as a matter I read this group from Google.) I was
hoping for some new insightful responses.


From mr.spoon21 at gmail.com  Mon May 25 14:02:48 2009
From: mr.spoon21 at gmail.com (Mr.SpOOn)
Date: Mon, 25 May 2009 20:02:48 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
Message-ID: <8f67b6f80905251102o2b209de8gf05e7a27d29768f5@mail.gmail.com>

2009/5/25 LittleGrasshopper <seattlehanks at yahoo.com>:
> I know Google (as a matter I read this group from Google.) I was
> hoping for some new insightful responses.

It's just too hot to start a flame :P


From ebonak at hotmail.com  Mon May 25 14:07:24 2009
From: ebonak at hotmail.com (Esmail)
Date: Mon, 25 May 2009 14:07:24 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <gvemos$old$2@ger.gmane.org>

LittleGrasshopper wrote:
> 
> So what do you guys use, and why? Hopefully we can keep this civil.

I use Emacs, just because I have been using this editor for
all sorts of things in the last 20+ years.

I haven't been able to get the python mode to work for Windows
(do most of my work under Linux anyway), but other than that I'm
pretty happy with it :-)

HTH,
Esmail



From ryniek90 at gmail.com  Mon May 25 14:24:45 2009
From: ryniek90 at gmail.com (Ryniek90)
Date: Mon, 25 May 2009 20:24:45 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <mailman.2542.1243275133.8014.python-list@python.org>
References: <mailman.2542.1243275133.8014.python-list@python.org>
Message-ID: <4A1AE26D.4050403@gmail.com>


>
> ------------------------------------------------------------------------
>
> Temat:
> Re: What text editor is everyone using for Python
> Od:
> Esmail <ebonak at hotmail.com>
> Data:
> Mon, 25 May 2009 14:07:24 -0400
> Do:
> python-list at python.org
>
> Do:
> python-list at python.org
>
>
> LittleGrasshopper wrote:
>>
>> So what do you guys use, and why? Hopefully we can keep this civil.
>
> I use Emacs, just because I have been using this editor for
> all sorts of things in the last 20+ years.
>
> I haven't been able to get the python mode to work for Windows
> (do most of my work under Linux anyway), but other than that I'm
> pretty happy with it :-)
>
> HTH,
> Esmail
>
>

I'm using Geany (sort of small IDE) and I'm glad using it. But for big 
projects, NetBeans or Eclipse are better. There are also Komodo EDIT or 
Stani's Python Editor. Of course if someone like GUI editors/IDE's. 
Otherwise, use Vi/Emacs. Like someone previously said, search the Google.


From celoserpa at gmail.com  Mon May 25 14:28:20 2009
From: celoserpa at gmail.com (Marcelo de Moraes Serpa)
Date: Mon, 25 May 2009 13:28:20 -0500
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1AE26D.4050403@gmail.com>
References: <mailman.2542.1243275133.8014.python-list@python.org>
	<4A1AE26D.4050403@gmail.com>
Message-ID: <1e5bcefd0905251128h674615a5m45d79385d9ac0c2c@mail.gmail.com>

emacs is a swiss-knife, good for small, medium, big or huge projects, or
single files

On Mon, May 25, 2009 at 1:24 PM, Ryniek90 <ryniek90 at gmail.com> wrote:

>
>
>> ------------------------------------------------------------------------
>>
>> Temat:
>> Re: What text editor is everyone using for Python
>> Od:
>> Esmail <ebonak at hotmail.com>
>> Data:
>> Mon, 25 May 2009 14:07:24 -0400
>> Do:
>> python-list at python.org
>>
>> Do:
>> python-list at python.org
>>
>>
>> LittleGrasshopper wrote:
>>
>>>
>>> So what do you guys use, and why? Hopefully we can keep this civil.
>>>
>>
>> I use Emacs, just because I have been using this editor for
>> all sorts of things in the last 20+ years.
>>
>> I haven't been able to get the python mode to work for Windows
>> (do most of my work under Linux anyway), but other than that I'm
>> pretty happy with it :-)
>>
>> HTH,
>> Esmail
>>
>>
>>
> I'm using Geany (sort of small IDE) and I'm glad using it. But for big
> projects, NetBeans or Eclipse are better. There are also Komodo EDIT or
> Stani's Python Editor. Of course if someone like GUI editors/IDE's.
> Otherwise, use Vi/Emacs. Like someone previously said, search the Google.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From nospam at nospam.com  Mon May 25 14:49:50 2009
From: nospam at nospam.com (Gilles Ganault)
Date: Mon, 25 May 2009 20:49:50 +0200
Subject: Are Python-based web frameworks reliable enough?
Message-ID: <7opl151anck3qve09uu88t67khgbd9ob1t@4ax.com>

Hello

	Until now, the modest web apps I wrote were all in PHP because it's
available on just about any hosted server.

I now have a couple of ideas for applications where I would deploy my
own servers, so that I'd rather write them in Python because I find
the language more pleasant to write with.

I read that the traction for the mod_python module isn't as strong as
mod_php, so I guess I should consider the alternative, which is
writing a long-running process with some framework like TurboGears or
Django.

To make an informed choice, I'd like your feedback on this:

1. Is mod_python a bad choice today? If yes, are there other PHP-like
modules available, ie. the Python code is hosted in pages that are
loaded every time a user calls them?

2. If you think I should consider long-running processes, are the
frameworks reliable enough so that I shouldn't fear crashes every so
often?

3. What about performance as compared to equivalent PHP/MySQL apps?

Thank  you for any feedback.


From hackingkk at gmail.com  Mon May 25 15:41:38 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Tue, 26 May 2009 01:11:38 +0530
Subject: Are Python-based web frameworks reliable enough?
In-Reply-To: <7opl151anck3qve09uu88t67khgbd9ob1t@4ax.com>
References: <7opl151anck3qve09uu88t67khgbd9ob1t@4ax.com>
Message-ID: <1243280498.5645.15.camel@kk-laptop>

On Mon, 2009-05-25 at 20:49 +0200, Gilles Ganault wrote:
> Hello
> 
> 	Until now, the modest web apps I wrote were all in PHP because it's
> available on just about any hosted server.
> 
> I now have a couple of ideas for applications where I would deploy my
> own servers, so that I'd rather write them in Python because I find
> the language more pleasant to write with.
> Certainly, You will be much much more productive if you use python provided you are not going to do it the old "cgi " way.

> I read that the traction for the mod_python module isn't as strong as
> mod_php, so I guess I should consider the alternative, which is
> writing a long-running process with some framework like TurboGears or
> Django.
> 
Why not give a try to pylons?  While turbogears is great and very
powerful, it any ways uses most of pylons and pylons is not just rock
solid and robust, it also has very very good documentation.
Not to mention the fact that heavy production applications are today
running pylons.

> To make an informed choice, I'd like your feedback on this:
> 
> 1. Is mod_python a bad choice today? If yes, are there other PHP-like
> modules available, ie. the Python code is hosted in pages that are
> loaded every time a user calls them?
> Even if it was a good choice, cgi method of programming is no more suitable in today's www, because the requirements of a web developer today are much beyond just oepning a connection to a database and sending some processed response in plain old html.
Today's web applications do much more than that so a web framework is
almost always a better choice.

>   
> 2. If you think I should consider long-running processes, are the
> frameworks reliable enough so that I shouldn't fear crashes every so
> often?
> 
No not really, although it is always a better idea to run your
production web app behind apache.  This will keep the server up on very
heavy loads and you will not have to worry about http requests and
responses.  let that be taken care by the best tool (apache ) and let
your application handle how to manage the logic and send out views.

> 3. What about performance as compared to equivalent PHP/MySQL apps?
> 
Performance is very good if you use the right tool in the right place.
This is the biggest advantage of some web frameworks like pylons or tg
over other.
happy hacking.
Krishnakant.





From pythoncurious at gmail.com  Mon May 25 16:00:00 2009
From: pythoncurious at gmail.com (pythoncurious at gmail.com)
Date: Mon, 25 May 2009 13:00:00 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org> 
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com> 
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com> 
	<mailman.681.1243202929.8015.python-list@python.org>
Message-ID: <6cf0f5dc-e9c6-4cf6-b6f7-d8f3814222da@n21g2000vba.googlegroups.com>

On May 25, 12:08?am, Dave Angel <da... at ieee.org> wrote:

>
> Is Clearcase still around? ?I hope it works better than it did in 1992.
>

I don't know how it worked back then, but if it's worse than today, I
don't know how they ever managed to get people to use it. I'm not a
fan and I don't have a choice about using it :)

> Somebody else has already pointed out that you can tell Python not to
> create thosefiles(during your development stages).
>

Yes, that's probably the best way to sort out the problems.
It would of course be nice if python could detect that these files
aren't usable and just regenerate them. I realise it might not be a
trivial feature to implement though.
>
> Perhaps Clearcase supports some form of "exclusion" parameter, wherein
> you say not to do version control onfileswith certain patterns, like .pyc

They're not actually version controlled, but "view private" as someone
described. This means I'll see them whenever I'm using the view they
were created in.



From gd_spam at spamfence.net  Mon May 25 16:03:36 2009
From: gd_spam at spamfence.net (=?UTF-8?Q?G=C3=BCnther?= Dietrich)
Date: Mon, 25 May 2009 22:03:36 +0200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <o5are6-5ep.ln1@spamfence.net>

LittleGrasshopper <seattlehanks at yahoo.com> wrote:

>With so many choices, I was wondering what editor is the one you
>prefer when coding Python, and why.

[...]

>So what do you guys use, and why? Hopefully we can keep this civil.

I found 'EasyEclipse for Python' soon after I began using Python. With 
PyDev, it even contains a Python debugger.
After adding a Mercurial plug-in, it has all I need for Python 
programming.
One disadvantage of EasyEclipse is, that they mangled the install/update 
system, so that it is very difficult to find the original Eclipse 
plug-ins/features.

So, in between, I replaced EasyEclipse by Eclipse, with all the plug-ins 
that came bundled with 'EasyEclipse for Python' installed by hand, but 
more actual versions.
In my opinion, it is a very convenient system for Python development, 
especially due to the debugger.
If you don't use the free PyDev, but the commercial one, you even get a 
debugger for remote debugging. Useful e.g. for debugging of blender 
scripts.



Best regards,

G?nther


From pythoncurious at gmail.com  Mon May 25 16:04:18 2009
From: pythoncurious at gmail.com (pythoncurious at gmail.com)
Date: Mon, 25 May 2009 13:04:18 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org> 
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com> 
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com> 
	<73631ab6-ab2a-4b21-928c-f7690d6e8e00@j18g2000prm.googlegroups.com>
Message-ID: <0527679c-5b3a-4919-b044-9ae8ba97d802@z5g2000yqn.googlegroups.com>

On May 25, 12:07?am, John Machin <sjmac... at lexicon.net> wrote:

> "switching" scarcely seems to be the right description. You appear to
> be running the same code from one repository simultaneously available
> to two different platforms.
>
> Try this: Instead of running your code straight from your repository,
> set up a run-time "launch pad" in an appropriate place for each
> platform. When there is a new release of your app, install it in each
> launchpad.

For releases, that's a good enough idea. But while developing and
wanting to run units tests, it's sort of a big overhead. Especially
since I tend to run the unit test quite frequently.

>
> I'm a bit lost here ... your clearcase repository uses a mysterious
> "some sort of network file system" to which you have access
> permissions which allow you to delete individualfiles??

Apparently I don't explain things well. :)
Others have explained it better in this thread or you can have a look
at http://en.wikipedia.org/wiki/Rational_ClearCase.


From roy at panix.com  Mon May 25 16:28:33 2009
From: roy at panix.com (Roy Smith)
Date: Mon, 25 May 2009 16:28:33 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <roy-6050D4.16283325052009@news.panix.com>

LittleGrasshopper <seattlehanks at yahoo.com> wrote:

> I normally use vi
> [...]
> I dabbled with emacs at some point
> [...]
> So what do you guys use, and why? Hopefully we can keep this civil.

I'm confused.  You put emacs and vi in the same paragraph and then expect 
the conversation to remain civil? :-)


From mmanns at gmx.net  Mon May 25 17:22:51 2009
From: mmanns at gmx.net (mmanns at gmx.net)
Date: Mon, 25 May 2009 23:22:51 +0200
Subject: Determining 32 bit vs 64 bit Python and numpy
Message-ID: <20090525232251.179d9152@gmx.net>

Hi

I am looking for a robust, cross-platform way to determine if I am on a
32 bit or a 64 bit Python and if the numpy installation is also 32 bit
or 64 bit.

I have googled a bit and found some platform specific solutions but
nothing general.

The solution should work with different versions of Python (>= 2.4).

Thanks in advance

Martin


From martin at v.loewis.de  Mon May 25 17:54:45 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Mon, 25 May 2009 23:54:45 +0200
Subject: Determining 32 bit vs 64 bit Python and numpy
In-Reply-To: <20090525232251.179d9152@gmx.net>
References: <20090525232251.179d9152@gmx.net>
Message-ID: <4a1b13a5$0$20453$9b622d9e@news.freenet.de>

> I am looking for a robust, cross-platform way to determine if I am on a
> 32 bit or a 64 bit Python and if the numpy installation is also 32 bit
> or 64 bit.

You can find out the size of a pointer with struct.calcsize("P") * 8.
Numpy will have the same configuration if you can import it.

Regards,
Martin


From mmanns at gmx.net  Mon May 25 18:07:56 2009
From: mmanns at gmx.net (mmanns at gmx.net)
Date: Tue, 26 May 2009 00:07:56 +0200
Subject: Determining 32 bit vs 64 bit Python and numpy
References: <20090525232251.179d9152@gmx.net>
	<4a1b13a5$0$20453$9b622d9e@news.freenet.de>
Message-ID: <20090526000756.4a5b4176@gmx.net>

On Mon, 25 May 2009 23:54:45 +0200
"Martin v. L?wis" <martin at v.loewis.de> wrote:

> > I am looking for a robust, cross-platform way to determine if I am
> > on a 32 bit or a 64 bit Python and if the numpy installation is
> > also 32 bit or 64 bit.
> 
> You can find out the size of a pointer with struct.calcsize("P") * 8.
> Numpy will have the same configuration if you can import it.


That works great. Thank you.

Best Regards

Martin



From ebonak at hotmail.com  Mon May 25 19:23:03 2009
From: ebonak at hotmail.com (Esmail)
Date: Mon, 25 May 2009 19:23:03 -0400
Subject: Optimizing math functions
In-Reply-To: <loom.20090525T082837-787@post.gmane.org>
References: <mailman.619.1243084999.8015.python-list@python.org>	<0033dace$0$9725$c3e8da3@news.astraweb.com>	<loom.20090524T083337-764@post.gmane.org>	<4A193DD5.4090401@hotmail.com>
	<loom.20090525T082837-787@post.gmane.org>
Message-ID: <gvf98o$omp$1@ger.gmane.org>

Charlie wrote:
> 
> It might work under Linux, however, it was developed under Windows and, to my
> knowledge, has never been tested on a Linux machine.  Basic operation only
> depends on installations of matplotlib, numpy, and scipy.  Those packages are
> all available on Linux.
> 
> If you try it, I'd like to know the outcome.

For sure, if I end up trying it I will post a message about my
results.

> The parasol options to launch Microsoft Office apps Excel, Power Point, and
> Word; or the ray tracing app POV-Ray, will very likely fail.

:-)

thanks again for the information about Parasol,

Esmail




From sjmachin at lexicon.net  Mon May 25 19:52:11 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 25 May 2009 16:52:11 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org> 
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com> 
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com> 
	<73631ab6-ab2a-4b21-928c-f7690d6e8e00@j18g2000prm.googlegroups.com> 
	<0527679c-5b3a-4919-b044-9ae8ba97d802@z5g2000yqn.googlegroups.com>
Message-ID: <fe99d404-bb81-453e-afb9-b2d78569b94d@v23g2000pro.googlegroups.com>

On May 26, 6:04?am, pythoncuri... at gmail.com wrote:
> On May 25, 12:07?am, John Machin <sjmac... at lexicon.net> wrote:
>
> > "switching" scarcely seems to be the right description. You appear to
> > be running the same code from one repository simultaneously available
> > to two different platforms.
>
> > Try this: Instead of running your code straight from your repository,
> > set up a run-time "launch pad" in an appropriate place for each
> > platform. When there is a new release of your app, install it in each
> > launchpad.
>
> For releases, that's a good enough idea. But while developing and
> wanting to run units tests, it's sort of a big overhead. Especially
> since I tend to run the unit test quite frequently.

Oh .. so there's no concept of copying only the changed files??



From db3l.net at gmail.com  Mon May 25 20:56:02 2009
From: db3l.net at gmail.com (David Bolen)
Date: Mon, 25 May 2009 20:56:02 -0400
Subject: A fast way to read last line of gzip archive ?
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
	<m2y6smm7lw.fsf@valheru.db3l.homeip.net>
	<mailman.696.1243233822.8015.python-list@python.org>
Message-ID: <m2tz38n0m5.fsf@valheru.db3l.homeip.net>

"Barak, Ron" <Ron.Barak at lsi.com> writes:

> I couldn't really go with the shell utilities approach, as I have no
> say in my user environment, and thus cannot assume which binaries
> are install on the user's machine.

I suppose if you knew your target you could just supply the external
binaries to go with your application, but I agree that would probably
be more of a pain than its worth for the performance gain in real
world time.

> I'll try and implement your last suggestion, and see if the
> performance is acceptable to (human) users.

In terms of tuning the third option a bit, I'd play with the tracking
of the final two chunk (as mentioned in my first response), perhaps
shrinking the chunk size or only processing a smaller chunk of it for
lines (assuming a reasonable line size) to minimize the final loop.
You could also try using splitlines() on the final buffer rather than
a StringIO wrapper, although that'll have a memory hit for the
constructed list but doing a small portion of the buffer would
minimize that.

I was curious what I could actually achieve, so here are three variants
that I came up with.

First, this just fine tunes slightly tracking the chunks and then only
processes enough final data based on anticipated maximum length length
(so if the final line is longer than that you'll only get the final
MAX_LINE bytes of that line).  I also found I got better performance
using a smaller 1024 chunk size with GZipFile.read() than a MB - not
entirely sure why although it perhaps matches the internal buffer size
better:

    # last-chunk-2.py

    import gzip
    import sys

    CHUNK_SIZE = 1024
    MAX_LINE = 255

    in_file = gzip.open(sys.argv[1],'r')

    chunk = prior_chunk = ''
    while 1:
        prior_chunk = chunk
        # Note that CHUNK_SIZE here is in terms of decompressed data
        chunk = in_file.read(CHUNK_SIZE)
        if len(chunk) < CHUNK_SIZE:
            break

    if len(chunk) < MAX_LINE:
        chunk = prior_chunk + chunk

    line = chunk.splitlines(True)[-1]
    print 'Last:', line


On the same test set as my last post, this reduced the last-chunk
timing from about 2.7s to about 2.3s.

Now, if you're willing to play a little looser with the gzip module,
you can gain quite a bit more.  If you directly call the internal _read()
method you can bypass some of the unnecessary processing read() does, and
go back to larger I/O chunks:

    # last-gzip.py

    import gzip
    import sys

    CHUNK_SIZE = 1024*1024
    MAX_LINE = 255

    in_file = gzip.open(sys.argv[1],'r')

    chunk = prior_chunk = ''
    while 1:
        try:
            # Note that CHUNK_SIZE here is raw data size, not decompressed
            in_file._read(CHUNK_SIZE)
        except EOFError:
            if in_file.extrasize < MAX_LINE:
                chunk = chunk + in_file.extrabuf
            else:
                chunk = in_file.extrabuf
            break

        chunk = in_file.extrabuf
        in_file.extrabuf = ''
        in_file.extrasize = 0

    line = chunk[-MAX_LINE:].splitlines(True)[-1]
    print 'Last:', line

Note that in this case since I was able to bump up CHUNK_SIZE, I take
a slice to limit the work splitlines() has to do and the size of the
resulting list.  Using the larger CHUNK_SIZE (and it being raw size) will
use more memory, so could be tuned down if necessary.

Of course, the risk here is that you are dependent on the _read()
method, and the internal use of the extrabuf/extrasize attributes,
which is where _read() places the decompressed data.  In looking back
I'm pretty sure this code is safe at least for Python 2.4 through 3.0,
but you'd have to accept some risk in the future.

This approach got me down to 1.48s.

Then, just for the fun of it, once you're playing a little looser with
the gzip module, it's also doing work to compute the crc of the
original data for comparison with the decompressed data.  If you don't
mind so much about that (depends on what you're using the line for)
you can just do your own raw decompression with the zlib module, as in
the following code, although I still start with a GzipFile() object to
avoid having to rewrite the header processing:

    # last-decompress.py

    import gzip
    import sys
    import zlib

    CHUNK_SIZE = 1024*1024
    MAX_LINE = 255

    decompress = zlib.decompressobj(-zlib.MAX_WBITS)

    in_file = gzip.open(sys.argv[1],'r')
    in_file._read_gzip_header()

    chunk = prior_chunk = ''
    while 1:
        buf = in_file.fileobj.read(CHUNK_SIZE)
        if not buf:
            break
        d_buf = decompress.decompress(buf)
        # We might not have been at EOF in the read() but still have no
        # decompressed data if the only remaining data was not original data
        if d_buf:
            prior_chunk = chunk
            chunk = d_buf

    if len(chunk) < MAX_LINE:
        chunk = prior_chunk + chunk

    line = chunk[-MAX_LINE:].splitlines(True)[-1]
    print 'Last:', line

This version got me down to 1.15s.

So in summary, the choices when tested on my system ended up at:

    last             26
    last-chunk        2.7
    last-chunk-2      2.3
    last-popen        1.7
    last-gzip         1.48
    last-decompress   1.12

So by being willing to mix in some more direct code with the GzipFile
object, I was able to beat the overhead of shelling out to the faster
utilities, while remaining in pure Python.

-- David


From gallium.arsenide at gmail.com  Mon May 25 22:20:41 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Mon, 25 May 2009 19:20:41 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<roy-6050D4.16283325052009@news.panix.com>
Message-ID: <3227f485-7a1b-45c6-a6ad-c699473aa7e2@z7g2000vbh.googlegroups.com>

On May 25, 4:28?pm, Roy Smith <r... at panix.com> wrote:
>
> I'm confused. ?You put emacs and vi in the same paragraph
> and then expect the conversation to remain civil? :-)

I know!  He is really asking a lot!

Ultimately, I think if you are comfortable with vi, stick with vi.
There are plenty of people who are using Python-specific
configurations of vi to good effect.

Personally, I like SciTE.  Very small, very fast text editor based on
the Scintilla editor component.  It doesn't autoindent Python
perfectly out of the box, but I wrote a patch for myself (which I'm
happy to share with anyone who's interested).

I also have dabbled with Geany, which someone mentioned earlier.  I
already don't use all the features of SciTE, so I'm nowhere near
needing Geany's capabilities, but what I have seen of it I like, so I
am comfortable recommending it.  It also is very actively maintained
and supported, if that makes a difference.

John


From thushianthan15 at gmail.com  Mon May 25 23:05:13 2009
From: thushianthan15 at gmail.com (thushianthan15 at gmail.com)
Date: Mon, 25 May 2009 20:05:13 -0700 (PDT)
Subject: Network programming ?
Message-ID: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>


Hi everyone,

I am planning to develop a chatting software in Python, for my college
project. I am using Windows Vista. Is it possible to do sockets
programming in Python ? Any books or websites ?  Also, i want to
develop a gui for that program. What are the gui tool kits available
for windows? I already knew about PyGtk and PyQT, but will they work
properly in Windows platform? Any suggestions?

Thank you. Excuse my English.


From ralf at schoenian-online.de  Mon May 25 23:33:25 2009
From: ralf at schoenian-online.de (Ralf Schoenian)
Date: Tue, 26 May 2009 05:33:25 +0200
Subject: Network programming ?
In-Reply-To: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
Message-ID: <4a1b61b4$0$32664$9b4e6d93@newsspool2.arcor-online.net>

thushianthan15 at gmail.com wrote:
> Hi everyone,
> 
> I am planning to develop a chatting software in Python, for my college
> project. I am using Windows Vista. Is it possible to do sockets
> programming in Python ? Any books or websites ?  Also, i want to
> develop a gui for that program. What are the gui tool kits available
> for windows? I already knew about PyGtk and PyQT, but will they work
> properly in Windows platform? Any suggestions?
> 
> Thank you. Excuse my English.

You forgot to mention the other big gui toolkits tkinter and wxPython. 
Years ago, I decided for wxPython because of its licence and that it is 
useable at windows and linux. For the socket programming I would like to 
suggest using the xmlrpclib. You can find the official documentation 
here: http://docs.python.org/library/xmlrpclib.html

Regards,
Ralf Schoenian


From lepto.python at gmail.com  Tue May 26 00:47:29 2009
From: lepto.python at gmail.com (oyster)
Date: Tue, 26 May 2009 12:47:29 +0800
Subject: any lib to extract pages form pdf and then merge?
Message-ID: <6a4f17690905252147m4cb23f41s8647c37562259021@mail.gmail.com>

I want to extract some pages from vary pdf files, then write them
with/witout rotation into one new pdf file. something likes this
[py]
import gfx
doc = gfx.open("pdf", r"Theory.pdf")
pdf = gfx.PDF()
for pagenr in [1,5,7]:
    page = doc.getPage(pagenr)

    if pagenr==1:
        page.rotate(90)                                         #for some pages

    pdf.startpage(page.width, page.height)
    page.render(pdf)
    pdf.endpage()
pdf.save("new pdf.pdf")
[/py]

I have tried pypdf, but it errs and exits on some of my pdfs(no, the
files have no password)

can someone suggest on such a lib for python on windows/or a pure C-dll?
(I mean pdf page->pdf, not pdf page->pic->pdf)

thanx


From steven at REMOVE.THIS.cybersource.com.au  Tue May 26 01:01:14 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 26 May 2009 05:01:14 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <pan.2009.05.26.05.01.13@REMOVE.THIS.cybersource.com.au>

On Mon, 25 May 2009 10:35:03 -0700, LittleGrasshopper wrote:

> With so many choices, I was wondering what editor is the one you prefer
> when coding Python, and why.

I use kwrite when on a GUI. When I can't avoid editing files remotely 
over ssh, I use nano.

Why? I dislike Gnome's user-interface, and I find gedit slightly too 
underpowered and dumbed down for my taste. (Although it has a couple of 
nice features.) Of the KDE editors, kedit is too basic and I've never got 
into kate, although perhaps I should. kwrite has a nice clean, consistent 
UI that matches other KDE apps, instead of being hideously ugly like some 
apps I won't mention.

As for nano, I dislike having to memorize obscure ctrl-alt-shift key 
combos to do the simplest thing. For a handful of small edits, nano is 
perfectly adequate, doesn't tax my memory, and does the job.



-- 
Steven


From debatem1 at gmail.com  Tue May 26 01:39:20 2009
From: debatem1 at gmail.com (CTO)
Date: Mon, 25 May 2009 22:39:20 -0700 (PDT)
Subject: any lib to extract pages form pdf and then merge?
References: <mailman.735.1243313253.8015.python-list@python.org>
Message-ID: <a93f97db-c5f6-43b6-95a0-cbb7ee4d5aa4@p4g2000vba.googlegroups.com>

On May 26, 12:47?am, oyster <lepto.pyt... at gmail.com> wrote:
> I want to extract some pages from vary pdf files, then write them
> with/witout rotation into one new pdf file. something likes this
> [py]
> import gfx
> doc = gfx.open("pdf", r"Theory.pdf")
> pdf = gfx.PDF()
> for pagenr in [1,5,7]:
> ? ? page = doc.getPage(pagenr)
>
> ? ? if pagenr==1:
> ? ? ? ? page.rotate(90) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? #for some pages
>
> ? ? pdf.startpage(page.width, page.height)
> ? ? page.render(pdf)
> ? ? pdf.endpage()
> pdf.save("new pdf.pdf")
> [/py]
>
> I have tried pypdf, but it errs and exits on some of my pdfs(no, the
> files have no password)
>
> can someone suggest on such a lib for python on windows/or a pure C-dll?
> (I mean pdf page->pdf, not pdf page->pic->pdf)
>
> thanx

I'd recommend reportlab <URL: http://www.reportlab.org/>. It is mostly
geared towards creating new PDFs, but it is pretty much best-of-breed
AFAICT.

Geremy Condra


From Scott.Daniels at Acm.Org  Tue May 26 02:10:02 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 25 May 2009 23:10:02 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <pan.2009.05.25.05.22.14@REMOVE.THIS.cybersource.com.au>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.535.1242945935.8015.python-list@python.org>	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>	<gvb8kn$7gm$2@lust.ihug.co.nz>	<mailman.674.1243192904.8015.python-list@python.org>	<gvd6c0$bqs$1@lust.ihug.co.nz>
	<pan.2009.05.25.05.22.14@REMOVE.THIS.cybersource.com.au>
Message-ID: <FoidnSoDAqr_G4bXnZ2dnUVZ_gSdnZ2d@pdx.net>

Steven D'Aprano wrote:
> On Mon, 25 May 2009 16:21:19 +1200, Lawrence D'Oliveiro wrote:
>... (0) "Opposite" is not well-defined unless you have a dichotomy. In the 
>... (1/3) Why do you jump to the conclusion that "pi=3" implies that only 
>... (1/2) If you "get rid of real numbers", then obviously you must have a 
>... (2/3) There is *no* point (2/3).
>... (1) I thought about numbering my points as consecutive increasing
> integers, but decided that was an awfully boring convention. A shiny 
> banananana for the first person to recognise the sequence.

I'd call it F_3, but using a Germanic F (Farey sequence limit 3).

Do I get a banana or one with a few more ans?

--Scott David Daniels
Scott.Daniels at Acm.Org


From wuwei23 at gmail.com  Tue May 26 02:23:40 2009
From: wuwei23 at gmail.com (alex23)
Date: Mon, 25 May 2009 23:23:40 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<pan.2009.05.26.05.01.13@REMOVE.THIS.cybersource.com.au>
Message-ID: <127e2b7a-4683-4072-ba0a-ebeacf24f270@f37g2000pro.googlegroups.com>

On May 26, 3:01?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> I dislike Gnome's user-interface, and I find gedit slightly too
> underpowered and dumbed down for my taste. (Although it has a couple of
> nice features.)

Gedit is also nicely extensible: http://www.instructables.com/id/Using-Gedit-as-a-Python-IDE/

Not that I'm trying to change your editor, preferences are just
that :) (I tend to alternate between gvim, SPE and Komodo Edit...)


From ldo at geek-central.gen.new_zealand  Tue May 26 02:31:56 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 26 May 2009 18:31:56 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <gvg2cs$1a0$2@lust.ihug.co.nz>

In message <d6d05d39-98e7-4c28-
b201-4b2445732ab4 at v35g2000pro.googlegroups.com>, LittleGrasshopper wrote:

> ... I am looking for suitable syntax files for [editor of choice] ...

I don't understand why people need "syntax files" to use a text editor.



From steven at REMOVE.THIS.cybersource.com.au  Tue May 26 02:39:42 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 26 May 2009 06:39:42 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
Message-ID: <pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>

On Tue, 26 May 2009 18:31:56 +1200, Lawrence D'Oliveiro wrote:

> In message <d6d05d39-98e7-4c28-
> b201-4b2445732ab4 at v35g2000pro.googlegroups.com>, LittleGrasshopper
> wrote:
> 
>> ... I am looking for suitable syntax files for [editor of choice] ...
> 
> I don't understand why people need "syntax files" to use a text editor.

Do you want syntax highlighting?

If so, then your editor needs to either have an external config file 
describing the syntax you want highlighted, or a built-in internal config 
to do the same thing. For various reasons, it's better to have such 
config as an external file rather than compiled into the editor.

If you've never used syntax highlighting, then you don't know what you're 
missing. I can do without it, but it's a bother.



-- 
Steven


From martin at v.loewis.de  Tue May 26 02:59:51 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 26 May 2009 08:59:51 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A1AD862.6090100@egenix.com>
References: <4A107988.3020202@v.loewis.de> <4A1AD862.6090100@egenix.com>
Message-ID: <4A1B9367.7090808@v.loewis.de>

> Now, with the PEP, I have a feeling that the Python C-API
> will in effect be limited to what's in the PEP's idea of
> a usable ABI and open up the non-inluded public C-APIs
> to the same rate of change as the private APIs.

That's certainly not the plan. Instead, the plan is to have
a stable ABI. The policy on the API isn't affected, except
for restricting changes to the API that would break the ABI.

>> During the compilation of applications, the preprocessor macro
>> Py_LIMITED_API must be defined. Doing so will hide all definitions
>> that are not part of the ABI.
> 
> So extensions wanting to use the full Python C-API as documented
> in the C-API docs will still be able to do this, right ?

Correct. They would link to the version-specific DLL on Windows.

>> The structure of type objects is not available to applications;
>> declaration of "static" type objects is not possible anymore
>> (for applications using this ABI).
> 
> Hmm, that's going to create big problems for extensions that
> want to expose a C-API for their types: Type checks are normally
> done by pointer comparison using those static type objects.

I don't see the problem. During module initialization, you
create the type object and store it in a global variable, and
then both clients and the module compare against the stored
pointer.

>> Function-like macros (in particular, field access macros) remain
>> available to applications, but get replaced by function calls
>> (unless their definition only refers to features of the ABI, such
>> as the various _Check macros)
> 
> Including Py_INCREF()/Py_DECREF() ?

Yes, although some people are requesting that these become functions.

>> Excluded Functions
>> ------------------
>>
>> Functions declared in the following header files are not part
>> of the ABI:
>> - cellobject.h
>> - classobject.h
>> - code.h
>> - frameobject.h
>> - funcobject.h
>> - genobject.h
>> - pyarena.h
>> - pydebug.h
>> - symtable.h
>> - token.h
>> - traceback.h
> 
> I don't think that's feasable: you basically remove all introspection
> functions that way.
> 
> This will need a more fine-grained approach.

What specifically is it that you want to do in a module that you
couldn't do anymore?

>> On Windows, applications shall link with python3.dll;
> 
> You mean: extensions that were compiled with Py_LIMITED_API, right ?

Correct, see "Terminology" in the PEP.

> 
>> an import
>> library python3.lib will be available. This DLL will redirect all of
>> its API functions through /export linker options to the full
>> interpreter DLL, i.e. python3y.dll.
> 
> What if you mix extensions that use the full C-API with ones
> that restrict themselves to the limited version ?

Some link against python3.dll, others against python32.dll (say).

> Would creating a Python object in a full-API extension and
> free'ing it in a limited-API extension cause problems ?

No problem that I can see.

>> This PEP will be implemented in a branch, allowing users to check
>> whether their modules conform to the ABI. To simplify this testing, an
>> additional macro Py_LIMITED_API_WITH_TYPES will expose the existing
>> type object layout, to let users postpone rewriting all types. When
>> the this branch is merged into the 3.2 code base, this macro will
>> be removed.
> 
> Now I'm confused again: this sounds a lot like you do want all extension
> writers to only use the limited API.

I certainly want to support as many modules as reasonable with the PEP.
Whether or not developers then chose to build version-independent
binaries is certainly outside the scope of the PEP - it only specifies
action items for Python, not for application authors.

>>> Something I haven't seen explicitly mentioned as yet (in the PEP or the
>>>> python-dev list discussion) are the memory management APIs and the FILE*
>>>> APIs which can cause the MSVCRT versioning issues on Windows.
>>>>
>>>> Those would either need to be excluded from the stable ABI or else
>>>> changed to use opaque pointers.
>> Good point. As a separate issue, I would actually like to deprecate,
>> then remove these APIs. I had originally hoped that this would happen
>> for 3.0 already, alas, nobody worked on it.
>>
>> In any case, I have removed them from the ABI now.
> 
> How do you expect Python extensions to allocate memory and objects
> in a platform independent way without those APIs ?

I have only removed functions from the ABI that have FILE* in their
signatures.

> And as an aside: Which API families are you referring to ? PyMem_Malloc,
> PyObject_Malloc, or PyObject_New ?

Neither. PyRun_AnyFileFlags and friends.

Regards,
Martin


From gagsl-py2 at yahoo.com.ar  Tue May 26 03:19:14 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 26 May 2009 04:19:14 -0300
Subject: exec statement with/without prior compile...
References: <97a8f1a70905250707m413e428ei63494285248d0afa@mail.gmail.com>
Message-ID: <op.uuizvjgqx6zn5v@gabriel.sleipnir-bsas>

En Mon, 25 May 2009 11:07:13 -0300, Jaime Fernandez del Rio
<jaime.frio at gmail.com> escribi?:

> These weekend I've been tearing down to pieces Michele Simionato's
> decorator module, that builds signature preserving decorators. At the
> heart of it all there is a dynamically generated function, which works
> something similar to this...
>
> ...
>     src = """def function(a,b,c) :\n    return _caller_(a,b,c)\n"""
>     evaldict = {'_caller_' : _caller_}
>     code = compile(src, '<string>', 'single')
>     exec code in evaldict
>     new_func = evaldict[function]
> ...
>
> I have found fooling around with this code, that the compile step can
> be completely avoided and go for a single:
>
>     exec src in evaldict
>
> Now, I'm sure there is a good reason for that additional step, but I
> haven't been able to find what the difference between both approaches
> is.

The only reason I can think of, is restricting src to be a single
statement only (due to the compile flag used).

> And since I'm asking, could something similar, i.e. defining a new
> function and get a handle to it, be achieved with eval?

No, because def is a statement, and eval only accepts an expression.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue May 26 03:20:11 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 26 May 2009 04:20:11 -0300
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org>
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com>
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com>
	<mailman.681.1243202929.8015.python-list@python.org>
	<6cf0f5dc-e9c6-4cf6-b6f7-d8f3814222da@n21g2000vba.googlegroups.com>
Message-ID: <op.uuixybghx6zn5v@gabriel.sleipnir-bsas>

En Mon, 25 May 2009 17:00:00 -0300, <pythoncurious at gmail.com> escribi?:
> On May 25, 12:08?am, Dave Angel <da... at ieee.org> wrote:
>
>> Somebody else has already pointed out that you can tell Python not to
>> create thosefiles(during your development stages).
>
> Yes, that's probably the best way to sort out the problems.
> It would of course be nice if python could detect that these files
> aren't usable and just regenerate them. I realise it might not be a
> trivial feature to implement though.

.pyc files are platform independent; you *can* use the same .pyc files
both on Windows and Linux.
A .pyc/.pyo file contains two bits of info:
- a magic number that depends on the Python version that created it
- the last-modification-time of the corresponding .py source
When you import a module, both numbers are read from the .pyc file. If the
magic number matches the version of the running Python, and the
modification time matches the one of the .py file (or no .py file exists),
then the .pyc file is used. In any other case, the .py file is read,
compiled, and a .pyc file is written -- if possible.

So, if you ensure that both platforms "see" the same
last-modification-time, and you use the same Python version on both
platforms, then .pyc files may be shared. If not, each time you switch
platforms all .pyc files will be re-created (option -B avoids that, as
already noted).

I any case, I don't think leaving the wrong .pyc files should create any
problem (except some delay when the application starts, and unless you've
found a bug, of course)

-- 
Gabriel Genellina



From ldo at geek-central.gen.new_zealand  Tue May 26 03:23:19 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 26 May 2009 19:23:19 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
Message-ID: <gvg5d7$382$2@lust.ihug.co.nz>

In message <pan.2009.05.26.06.39.41 at REMOVE.THIS.cybersource.com.au>, Steven 
D'Aprano wrote:

> On Tue, 26 May 2009 18:31:56 +1200, Lawrence D'Oliveiro wrote:
> 
>> In message <d6d05d39-98e7-4c28-
>> b201-4b2445732ab4 at v35g2000pro.googlegroups.com>, LittleGrasshopper
>> wrote:
>> 
>>> ... I am looking for suitable syntax files for [editor of choice] ...
>> 
>> I don't understand why people need "syntax files" to use a text editor.
> 
> Do you want syntax highlighting?

Why?



From petshmidt at googlemail.com  Tue May 26 03:29:00 2009
From: petshmidt at googlemail.com (Pet)
Date: Tue, 26 May 2009 00:29:00 -0700 (PDT)
Subject: unicode confusing
References: <ac50a990-d612-4ee2-931d-a07ecf98056e@37g2000yqp.googlegroups.com>
	<bd608c8b-be06-46ee-ac96-011e0e8db717@c9g2000yqm.googlegroups.com>
Message-ID: <6683d787-df69-4a26-9c55-20115cbae42f@z9g2000yqi.googlegroups.com>

On May 25, 6:07?pm, Paul Boddie <p... at boddie.org.uk> wrote:
> On 25 Mai, 17:39, someone <petshm... at googlemail.com> wrote:
>
> > Hi,
>
> > reading content of webpage (encoded in utf-8) with urllib2, I can't
> > get parsed data into DB
>
> > Exception:
>
> > ? File "/usr/lib/python2.5/site-packages/pyPgSQL/PgSQL.py", line 3111,
> > in execute
> > ? ? raise OperationalError, msg
> > libpq.OperationalError: ERROR: ?invalid UTF-8 byte sequence detected
> > near byte 0xe4
>
> > I've already checked several python unicode tutorials, but I have no
> > idea how to solve my problem.
>
> With pyPgSQL, there are a few tricks that you have to take into
> account:
>
> 1. With PostgreSQL, it would appear advantageous to create databases
> using the "-E unicode" option.

Hi,

DB is in UTF8


>
> 2. When connecting, use the client_encoding and unicode_results
> arguments for the connect function call:
>
> ? connection = PgSQL.connect(client_encoding="utf-8",
> unicode_results=1)

If I do unicode_results=1, then there are exceptions in other places,
e.g. urllib.urlencode(values)
cant encode values

>
> 3. After connecting, it appears necessary to set the client encoding
> explicitly:
>
> ? connection.cursor().execute("set client_encoding to unicode")

I've tried this as well, but still have exceptions

>
> I'd appreciate any suggestions which improve on the above, but what
> this should allow you to do is to present Unicode objects to the
> database and to receive such objects from queries. Whether you can
> relax this and pass UTF-8-encoded strings instead of Unicode objects
> is not something I can guarantee, but it's usually recommended that
> you manipulate Unicode objects in your program where possible, and
> here you should be able to let pyPgSQL deal with the encodings
> preferred by the database.
>

Thanks for your suggestions! Sadly, I can't solve my problem...

Pet

> Paul



From debatem1 at gmail.com  Tue May 26 03:48:08 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 26 May 2009 00:48:08 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au> 
	<gvg5d7$382$2@lust.ihug.co.nz>
Message-ID: <1122037b-4c3b-42f9-bdf9-a5eb2a0589f8@c9g2000yqm.googlegroups.com>

On May 26, 3:23?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <pan.2009.05.26.06.39... at REMOVE.THIS.cybersource.com.au>, Steven
>
> D'Aprano wrote:
> > On Tue, 26 May 2009 18:31:56 +1200, Lawrence D'Oliveiro wrote:
>
> >> In message <d6d05d39-98e7-4c28-
> >> b201-4b2445732... at v35g2000pro.googlegroups.com>, LittleGrasshopper
> >> wrote:
>
> >>> ... I am looking for suitable syntax files for [editor of choice] ...
>
> >> I don't understand why people need "syntax files" to use a text editor.
>
> > Do you want syntax highlighting?
>
> Why?

Provides a clear visual indicator of when you've screwed up, which is
pretty important for me ;)

Geremy Condra


From mail at microcorp.co.za  Tue May 26 03:58:40 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 26 May 2009 09:58:40 +0200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<pan.2009.05.26.05.01.13@REMOVE.THIS.cybersource.com.au>
Message-ID: <001801c9ddd7$d1891960$0d00a8c0@Hendrik>

"Steven D'Aprano" <stev... at source.com.au> wrote:

>I use kwrite when on a GUI. When I can't avoid editing files remotely
>over ssh, I use nano.
>
>Why? I dislike Gnome's user-interface, and I find gedit slightly too
>underpowered and dumbed down for my taste. (Although it has a couple of
>nice features.) Of the KDE editors, kedit is too basic and I've never got
>into kate, although perhaps I should. kwrite has a nice clean, consistent
>UI that matches other KDE apps, instead of being hideously ugly like some
>apps I won't mention.
>
Interesting - Kwrite is essentially a bit of a dumbed down Kate - and I use
both - for python stuff I use Kwrite, set up to indent with tabs, and for SDCL
and C code I use Kate, set up to indent with spaces.  I have not noticed a
difference
in the UI, except that Kate keeps a list of active files, and seems to remember
what you were doing last time you used it.  (on SuSe)

When ssh- ing I have been using vim, painfully. Must look at nano - sounds good.
I really miss Brief.

- Hendrik




From davea at ieee.org  Tue May 26 04:00:52 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 26 May 2009 04:00:52 -0400
Subject: Network programming ?
In-Reply-To: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
Message-ID: <4A1BA1B4.70900@ieee.org>

thushianthan15 at gmail.com wrote:
> Hi everyone,
>
> I am planning to develop a chatting software in Python, for my college
> project. I am using Windows Vista. Is it possible to do sockets
> programming in Python ? Any books or websites ?  Also, i want to
> develop a gui for that program. What are the gui tool kits available
> for windows? I already knew about PyGtk and PyQT, but will they work
> properly in Windows platform? Any suggestions?
>
> Thank you. Excuse my English.
>
>   
You're asking two very distinct questions, and I hope others will chime 
in, especially with the sockets one.

1)  There is a module called socket, for low level BSD socket access, 
and it does support Windows (plus Mac OSX, BeOS, OS/2, and "all modern 
Unix"   No experience with it, however.

2) There is tkInterf supplied with Python to do GUI development.  
However, when I studied the choices I knew about, I picked wxPython.  I 
don't even remember the other choices, because it's hard to learn more 
than one.

see:  http://www.python.org/
and http://wiki.wxpython.org/

Both totally free, and with very easy (msi) installers for Windows.

Watch out for versions, though.  If you're goin to run wxPython, you 
want to get Python 2.5x or 2.6x, nothing later.  And many say that  
wxPython for  2.5x is more stable,
Then when you download wxPython, you need to get the matching version.

 


From antroy at gmail.com  Tue May 26 04:04:24 2009
From: antroy at gmail.com (Ant)
Date: Tue, 26 May 2009 01:04:24 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <07992af4-7878-4c78-bd6f-6c520c6d61c5@r13g2000vbr.googlegroups.com>

On May 25, 6:35?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> With so many choices, I was wondering what editor is the one you
> prefer when coding Python, and why. I normally use vi, and just got

I use GVim or vim if on a terminal. There are quite a few plugins and
scripts I find invaluable, but most are not python specific, and many
are home grown (if compiled against python, you can script vim using
Python).


From petshmidt at googlemail.com  Tue May 26 04:09:37 2009
From: petshmidt at googlemail.com (Pet)
Date: Tue, 26 May 2009 01:09:37 -0700 (PDT)
Subject: unicode confusing
References: <ac50a990-d612-4ee2-931d-a07ecf98056e@37g2000yqp.googlegroups.com>
	<bd608c8b-be06-46ee-ac96-011e0e8db717@c9g2000yqm.googlegroups.com> 
	<6683d787-df69-4a26-9c55-20115cbae42f@z9g2000yqi.googlegroups.com>
Message-ID: <ab4b77ff-f3cf-4e9c-a2f6-19f1c9f1826e@z9g2000yqi.googlegroups.com>

On May 26, 9:29?am, Pet <petshm... at googlemail.com> wrote:
> On May 25, 6:07?pm, Paul Boddie <p... at boddie.org.uk> wrote:
>
>
>
>
>
> > On 25 Mai, 17:39, someone <petshm... at googlemail.com> wrote:
>
> > > Hi,
>
> > > reading content of webpage (encoded in utf-8) with urllib2, I can't
> > > get parsed data into DB
>
> > > Exception:
>
> > > ? File "/usr/lib/python2.5/site-packages/pyPgSQL/PgSQL.py", line 3111,
> > > in execute
> > > ? ? raise OperationalError, msg
> > > libpq.OperationalError: ERROR: ?invalid UTF-8 byte sequence detected
> > > near byte 0xe4
>
> > > I've already checked several python unicode tutorials, but I have no
> > > idea how to solve my problem.
>
> > With pyPgSQL, there are a few tricks that you have to take into
> > account:
>
> > 1. With PostgreSQL, it would appear advantageous to create databases
> > using the "-E unicode" option.
>
> Hi,
>
> DB is in UTF8
>
>
>
> > 2. When connecting, use the client_encoding and unicode_results
> > arguments for the connect function call:
>
> > ? connection = PgSQL.connect(client_encoding="utf-8",
> > unicode_results=1)
>
> If I do unicode_results=1, then there are exceptions in other places,
> e.g. urllib.urlencode(values)
> cant encode values
>
>
>
> > 3. After connecting, it appears necessary to set the client encoding
> > explicitly:
>
> > ? connection.cursor().execute("set client_encoding to unicode")
>
> I've tried this as well, but still have exceptions
>
>
>
> > I'd appreciate any suggestions which improve on the above, but what
> > this should allow you to do is to present Unicode objects to the
> > database and to receive such objects from queries. Whether you can
> > relax this and pass UTF-8-encoded strings instead of Unicode objects
> > is not something I can guarantee, but it's usually recommended that
> > you manipulate Unicode objects in your program where possible, and
> > here you should be able to let pyPgSQL deal with the encodings
> > preferred by the database.
>
> Thanks for your suggestions! Sadly, I can't solve my problem...
>
> Pet
>
>
>
> > Paul

After some time, I've tried, to convert result with unicode(result,
'ISO-8859-15') and that was it :)
I've thought it was already utf-8, because of charset defining in
<meta> of webpage I'm fetching
Pet


From Ron.Barak at lsi.com  Tue May 26 04:10:24 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Tue, 26 May 2009 09:10:24 +0100
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <m2tz38n0m5.fsf@valheru.db3l.homeip.net>
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
	<m2y6smm7lw.fsf@valheru.db3l.homeip.net>
	<mailman.696.1243233822.8015.python-list@python.org>
	<m2tz38n0m5.fsf@valheru.db3l.homeip.net>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A252B@enbmail01.lsi.com>

Hi David, 
Thanks for the below solutions: most illuminating.
I implemented your previous message suggestions, and already the processing time (on my datasets) is within acceptable human times.
I'll try your suggestion below.
Thanks again.
Ron.

> -----Original Message-----
> From: David Bolen [mailto:db3l.net at gmail.com] 
> Sent: Tuesday, May 26, 2009 03:56
> To: python-list at python.org
> Subject: Re: A fast way to read last line of gzip archive ?
> 
> "Barak, Ron" <Ron.Barak at lsi.com> writes:
> 
> > I couldn't really go with the shell utilities approach, as 
> I have no 
> > say in my user environment, and thus cannot assume which 
> binaries are 
> > install on the user's machine.
> 
> I suppose if you knew your target you could just supply the 
> external binaries to go with your application, but I agree 
> that would probably be more of a pain than its worth for the 
> performance gain in real world time.
> 
> > I'll try and implement your last suggestion, and see if the 
> > performance is acceptable to (human) users.
> 
> In terms of tuning the third option a bit, I'd play with the 
> tracking of the final two chunk (as mentioned in my first 
> response), perhaps shrinking the chunk size or only 
> processing a smaller chunk of it for lines (assuming a 
> reasonable line size) to minimize the final loop.
> You could also try using splitlines() on the final buffer 
> rather than a StringIO wrapper, although that'll have a 
> memory hit for the constructed list but doing a small portion 
> of the buffer would minimize that.
> 
> I was curious what I could actually achieve, so here are 
> three variants that I came up with.
> 
> First, this just fine tunes slightly tracking the chunks and 
> then only processes enough final data based on anticipated 
> maximum length length (so if the final line is longer than 
> that you'll only get the final MAX_LINE bytes of that line).  
> I also found I got better performance using a smaller 1024 
> chunk size with GZipFile.read() than a MB - not entirely sure 
> why although it perhaps matches the internal buffer size
> better:
> 
>     # last-chunk-2.py
> 
>     import gzip
>     import sys
> 
>     CHUNK_SIZE = 1024
>     MAX_LINE = 255
> 
>     in_file = gzip.open(sys.argv[1],'r')
> 
>     chunk = prior_chunk = ''
>     while 1:
>         prior_chunk = chunk
>         # Note that CHUNK_SIZE here is in terms of decompressed data
>         chunk = in_file.read(CHUNK_SIZE)
>         if len(chunk) < CHUNK_SIZE:
>             break
> 
>     if len(chunk) < MAX_LINE:
>         chunk = prior_chunk + chunk
> 
>     line = chunk.splitlines(True)[-1]
>     print 'Last:', line
> 
> 
> On the same test set as my last post, this reduced the 
> last-chunk timing from about 2.7s to about 2.3s.
> 
> Now, if you're willing to play a little looser with the gzip 
> module, you can gain quite a bit more.  If you directly call 
> the internal _read() method you can bypass some of the 
> unnecessary processing read() does, and go back to larger I/O chunks:
> 
>     # last-gzip.py
> 
>     import gzip
>     import sys
> 
>     CHUNK_SIZE = 1024*1024
>     MAX_LINE = 255
> 
>     in_file = gzip.open(sys.argv[1],'r')
> 
>     chunk = prior_chunk = ''
>     while 1:
>         try:
>             # Note that CHUNK_SIZE here is raw data size, not 
> decompressed
>             in_file._read(CHUNK_SIZE)
>         except EOFError:
>             if in_file.extrasize < MAX_LINE:
>                 chunk = chunk + in_file.extrabuf
>             else:
>                 chunk = in_file.extrabuf
>             break
> 
>         chunk = in_file.extrabuf
>         in_file.extrabuf = ''
>         in_file.extrasize = 0
> 
>     line = chunk[-MAX_LINE:].splitlines(True)[-1]
>     print 'Last:', line
> 
> Note that in this case since I was able to bump up 
> CHUNK_SIZE, I take a slice to limit the work splitlines() has 
> to do and the size of the resulting list.  Using the larger 
> CHUNK_SIZE (and it being raw size) will use more memory, so 
> could be tuned down if necessary.
> 
> Of course, the risk here is that you are dependent on the 
> _read() method, and the internal use of the 
> extrabuf/extrasize attributes, which is where _read() places 
> the decompressed data.  In looking back I'm pretty sure this 
> code is safe at least for Python 2.4 through 3.0, but you'd 
> have to accept some risk in the future.
> 
> This approach got me down to 1.48s.
> 
> Then, just for the fun of it, once you're playing a little 
> looser with the gzip module, it's also doing work to compute 
> the crc of the original data for comparison with the 
> decompressed data.  If you don't mind so much about that 
> (depends on what you're using the line for) you can just do 
> your own raw decompression with the zlib module, as in the 
> following code, although I still start with a GzipFile() 
> object to avoid having to rewrite the header processing:
> 
>     # last-decompress.py
> 
>     import gzip
>     import sys
>     import zlib
> 
>     CHUNK_SIZE = 1024*1024
>     MAX_LINE = 255
> 
>     decompress = zlib.decompressobj(-zlib.MAX_WBITS)
> 
>     in_file = gzip.open(sys.argv[1],'r')
>     in_file._read_gzip_header()
> 
>     chunk = prior_chunk = ''
>     while 1:
>         buf = in_file.fileobj.read(CHUNK_SIZE)
>         if not buf:
>             break
>         d_buf = decompress.decompress(buf)
>         # We might not have been at EOF in the read() but 
> still have no
>         # decompressed data if the only remaining data was 
> not original data
>         if d_buf:
>             prior_chunk = chunk
>             chunk = d_buf
> 
>     if len(chunk) < MAX_LINE:
>         chunk = prior_chunk + chunk
> 
>     line = chunk[-MAX_LINE:].splitlines(True)[-1]
>     print 'Last:', line
> 
> This version got me down to 1.15s.
> 
> So in summary, the choices when tested on my system ended up at:
> 
>     last             26
>     last-chunk        2.7
>     last-chunk-2      2.3
>     last-popen        1.7
>     last-gzip         1.48
>     last-decompress   1.12
> 
> So by being willing to mix in some more direct code with the 
> GzipFile object, I was able to beat the overhead of shelling 
> out to the faster utilities, while remaining in pure Python.
> 
> -- David
> 
> 

From mail at microcorp.co.za  Tue May 26 04:13:51 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 26 May 2009 10:13:51 +0200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com><gvg2cs$1a0$2@lust.ihug.co.nz><pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
Message-ID: <002501c9ddd9$e89b3fa0$0d00a8c0@Hendrik>

"Lawrence D'Oliveiro" <ldo at geek....new_zealand> wrote:

> In message <pan.2009.05.26.06.39.41 at REMOVE.THIS.cybersource.com.au>, Steven 
> D'Aprano wrote:
> 
> > On Tue, 26 May 2009 18:31:56 +1200, Lawrence D'Oliveiro wrote:
> > 
> >> In message <d6d05d39-98e7-4c28-
> >> b201-4b2445732ab4 at v35g2000pro.googlegroups.com>, LittleGrasshopper
> >> wrote:
> >> 
> >>> ... I am looking for suitable syntax files for [editor of choice] ...
> >> 
> >> I don't understand why people need "syntax files" to use a text editor.
> > 
> > Do you want syntax highlighting?
> 
> Why?

It makes your screen look more busy as you type - for instance, if you
type a " or a ' then it treats the rest of the file from that point on as 
belonging to the same string you are about to start typing, and colours it
all using the colour you have selected for displaying string literals.
This is basically to make you seasick and to force you to type the closing
quote immediately and then to back arrow to inside the string again to finish
typing the string, thereby making sure that firstly you type more keystrokes, 
which will look good on your productivity summary, and secondly to save the
Python parser the hassle of dealing with a string that has no end quote.

Now with a recommendation like that - how can you possibly refuse to use
this excellent technology - are you some kind of Luddite, or what?

:-) - Hendrik




From piet at cs.uu.nl  Tue May 26 04:17:48 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Tue, 26 May 2009 10:17:48 +0200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<mailman.726.1243274859.8015.python-list@python.org>
Message-ID: <m2eiuc6zwz.fsf@cs.uu.nl>

>>>>> Esmail <ebonak at hotmail.com> (E) wrote:

>E> LittleGrasshopper wrote:
>>> 
>>> So what do you guys use, and why? Hopefully we can keep this civil.

>E> I use Emacs, just because I have been using this editor for
>E> all sorts of things in the last 20+ years.

Me too. I like my tools to be programmable.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From paul at boddie.org.uk  Tue May 26 04:29:28 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Tue, 26 May 2009 01:29:28 -0700 (PDT)
Subject: unicode confusing
References: <ac50a990-d612-4ee2-931d-a07ecf98056e@37g2000yqp.googlegroups.com>
	<bd608c8b-be06-46ee-ac96-011e0e8db717@c9g2000yqm.googlegroups.com> 
	<6683d787-df69-4a26-9c55-20115cbae42f@z9g2000yqi.googlegroups.com> 
	<ab4b77ff-f3cf-4e9c-a2f6-19f1c9f1826e@z9g2000yqi.googlegroups.com>
Message-ID: <31ff6688-3d09-43c1-a5d1-f7c373bac50b@z9g2000yqi.googlegroups.com>

On 26 Mai, 10:09, Pet <petshm... at googlemail.com> wrote:
>
> After some time, I've tried, to convert result with unicode(result,
> 'ISO-8859-15') and that was it :)

I haven't really investigated having unicode_results set to false (or
the default) with a database containing UTF-8 (or any non-ASCII
encoded) text, since it's always desirable to manipulate Unicode
internally in one's programs: I don't want plain strings containing
various encoded sequences of bytes when I'm dealing with characters.
That said, if one were consuming XML/HTML and then putting it in raw
form into a database (including the tags), I could understand that
Unicode objects might then seem like a distraction.

> I've thought it was already utf-8, because of charset defining in
> <meta> of webpage I'm fetching

There are lots of caveats about Web page encodings - which metadata
actually indicates the encoding - but I still regard the best approach
to involve converting text to Unicode as soon as possible, then
presenting Unicode objects to the database. This way, you can separate
the decisions about which encodings the Web pages are using and which
encoding the database is using.

Paul


From jeremiah.dodds at gmail.com  Tue May 26 04:31:32 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Tue, 26 May 2009 09:31:32 +0100
Subject: What text editor is everyone using for Python
In-Reply-To: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <12cbbbfc0905260131x7f1b3fd4g75ff7c038cb3c20a@mail.gmail.com>

On Mon, May 25, 2009 at 6:35 PM, LittleGrasshopper
<seattlehanks at yahoo.com>wrote:

> With so many choices, I was wondering what editor is the one you
> prefer when coding Python, and why. I normally use vi, and just got
> into Python, so I am looking for suitable syntax files for it, and
> extra utilities. I dabbled with emacs at some point, but couldn't get
> through the key bindings for commands. I've never tried emacs with vi
> keybindings (I forgot the name of it) but I've been tempted.
>
> So what do you guys use, and why? Hopefully we can keep this civil.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I, like some others on this list, use emacs.

I've heard that vi (well, vim) makes a pretty nice python editor though. If
you're comfortable with it, keep using it.
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From kalyanchakravarthy at hyit.com  Tue May 26 04:33:06 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Tue, 26 May 2009 14:03:06 +0530
Subject: which database is suitable for small applications
Message-ID: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>

Hi All,
          can any one suggest me which database I can use for my small
application(to store user names ,passwords, very few other data.. )
I am using Python, Google Apps and guide me how to connect to database, I am
very new to these technologies

Please help me

Thanks in advance

-- 
Regards
Kalyan
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From arnodel at googlemail.com  Tue May 26 04:46:04 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 26 May 2009 09:46:04 +0100
Subject: exec statement with/without prior compile...
References: <97a8f1a70905250707m413e428ei63494285248d0afa@mail.gmail.com>
	<mailman.736.1243322388.8015.python-list@python.org>
Message-ID: <m2ljok2qwj.fsf@googlemail.com>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:

> En Mon, 25 May 2009 11:07:13 -0300, Jaime Fernandez del Rio
> <jaime.frio at gmail.com> escribi?:
>> And since I'm asking, could something similar, i.e. defining a new
>> function and get a handle to it, be achieved with eval?
>
> No, because def is a statement, and eval only accepts an expression.

Well there is the lambda expression, which would work in the example
given in the OP.

-- 
Arnaud


From enzomich at gmail.com  Tue May 26 04:51:20 2009
From: enzomich at gmail.com (enzo michelangeli)
Date: Tue, 26 May 2009 01:51:20 -0700 (PDT)
Subject: How to create a list of functions depending on a parameter?
Message-ID: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>

Let's suppose I want to create a list of n functions of a single
argument, returning the sum between argument and index in the list, so
that e.g.:

f[0](10) will return 10
f[3](12) will return 15

...and so on. I had naively though of coding:

 f = [lambda x: x+j for j in range(n)]

Unfortunately, each function in the list f[]() behaves as a closure,
and f[k](p) does NOT return p+k but p+j (for whatever value j has at
the moment: typically n, the last value assumed by j in the list
comprehension loop).

Is there a way of achieving my goal? (Of course, n is not a constant
known in advance, so I can't manually unroll the loop.)

Thanks for any suggestion.


From steven at REMOVE.THIS.cybersource.com.au  Tue May 26 04:56:03 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 26 May 2009 08:56:03 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<pan.2009.05.26.05.01.13@REMOVE.THIS.cybersource.com.au>
	<mailman.738.1243324787.8015.python-list@python.org>
Message-ID: <pan.2009.05.26.08.56.03@REMOVE.THIS.cybersource.com.au>

On Tue, 26 May 2009 09:58:40 +0200, Hendrik van Rooyen wrote:

> "Steven D'Aprano" <stev... at source.com.au> wrote:
> 
>>I use kwrite when on a GUI. When I can't avoid editing files remotely
>>over ssh, I use nano.
>>
>>Why? I dislike Gnome's user-interface, and I find gedit slightly too
>>underpowered and dumbed down for my taste. (Although it has a couple of
>>nice features.) Of the KDE editors, kedit is too basic and I've never
>>got into kate, although perhaps I should. kwrite has a nice clean,
>>consistent UI that matches other KDE apps, instead of being hideously
>>ugly like some apps I won't mention.
>>
> Interesting - Kwrite is essentially a bit of a dumbed down Kate - and I
> use both - for python stuff I use Kwrite, set up to indent with tabs,
> and for SDCL and C code I use Kate, set up to indent with spaces.  I
> have not noticed a difference
> in the UI, except that Kate keeps a list of active files, and seems to
> remember what you were doing last time you used it.  (on SuSe)


By memory, I started using kwrite before kate even existed, or at least 
before it was included in KDE.

I think the most obvious difference is that kwrite uses one window per 
open file, and kate uses a single IDE-style window for all open files.



> When ssh- ing I have been using vim, painfully. Must look at nano -
> sounds good. I really miss Brief.

nano is basically an updated (forked?) version of pico.



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Tue May 26 04:57:48 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 26 May 2009 08:57:48 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
	<gvb8kn$7gm$2@lust.ihug.co.nz>
	<mailman.674.1243192904.8015.python-list@python.org>
	<gvd6c0$bqs$1@lust.ihug.co.nz>
	<pan.2009.05.25.05.22.14@REMOVE.THIS.cybersource.com.au>
	<FoidnSoDAqr_G4bXnZ2dnUVZ_gSdnZ2d@pdx.net>
Message-ID: <pan.2009.05.26.08.57.47@REMOVE.THIS.cybersource.com.au>

On Mon, 25 May 2009 23:10:02 -0700, Scott David Daniels wrote:

> Steven D'Aprano wrote:
>> On Mon, 25 May 2009 16:21:19 +1200, Lawrence D'Oliveiro wrote:
>>... (0) "Opposite" is not well-defined unless you have a dichotomy. In
>>the ... (1/3) Why do you jump to the conclusion that "pi=3" implies that
>>only ... (1/2) If you "get rid of real numbers", then obviously you must
>>have a ... (2/3) There is *no* point (2/3).
>>... (1) I thought about numbering my points as consecutive increasing
>> integers, but decided that was an awfully boring convention. A shiny
>> banananana for the first person to recognise the sequence.
> 
> I'd call it F_3, but using a Germanic F (Farey sequence limit 3).

That's the one.


> Do I get a banana or one with a few more ans?

I know how to spell bananananana, I just don't know when to stop.





-- 
Steven


From paul.nospam at rudin.co.uk  Tue May 26 05:00:14 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Tue, 26 May 2009 10:00:14 +0100
Subject: How to create a list of functions depending on a parameter?
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
Message-ID: <87fxes6xy9.fsf@rudin.co.uk>

enzo michelangeli <enzomich at gmail.com> writes:

> Let's suppose I want to create a list of n functions of a single
> argument, returning the sum between argument and index in the list, so
> that e.g.:
>
> f[0](10) will return 10
> f[3](12) will return 15
>
> ...and so on. I had naively though of coding:
>
>  f = [lambda x: x+j for j in range(n)]
>
> Unfortunately, each function in the list f[]() behaves as a closure,
> and f[k](p) does NOT return p+k but p+j (for whatever value j has at
> the moment: typically n, the last value assumed by j in the list
> comprehension loop).
>
> Is there a way of achieving my goal? (Of course, n is not a constant
> known in advance, so I can't manually unroll the loop.)
>

class Foo(object):

    def __init__(self, pos):
        self.pos = pos
        
    def __call__(self, arg):
        return self.pos + arg

f = [Foo(x) for x in range(10)]


From deets at nospam.web.de  Tue May 26 05:05:30 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 26 May 2009 11:05:30 +0200
Subject: How to create a list of functions depending on a parameter?
In-Reply-To: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
Message-ID: <781pmqF1k8bt5U1@mid.uni-berlin.de>

enzo michelangeli schrieb:
> Let's suppose I want to create a list of n functions of a single
> argument, returning the sum between argument and index in the list, so
> that e.g.:
> 
> f[0](10) will return 10
> f[3](12) will return 15
> 
> ...and so on. I had naively though of coding:
> 
>  f = [lambda x: x+j for j in range(n)]
> 
> Unfortunately, each function in the list f[]() behaves as a closure,
> and f[k](p) does NOT return p+k but p+j (for whatever value j has at
> the moment: typically n, the last value assumed by j in the list
> comprehension loop).
> 
> Is there a way of achieving my goal? (Of course, n is not a constant
> known in advance, so I can't manually unroll the loop.)

You need to capture n into the closure of the lambda:

f = [lambda x, n=n: x+j for j in xrange(n)]

Also note the use of xrange instead of range - the latter creates a 
list-object while the former only returns a generator. Most of the 
times, xrange is thus faster, and also most of the times less memory 
consuming (exception to this rule occur for small n, and are neglible)

Diez


From steven at REMOVE.THIS.cybersource.com.au  Tue May 26 05:10:41 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 26 May 2009 09:10:41 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
Message-ID: <pan.2009.05.26.09.10.40@REMOVE.THIS.cybersource.com.au>

On Tue, 26 May 2009 19:23:19 +1200, Lawrence D'Oliveiro wrote:

> In message <pan.2009.05.26.06.39.41 at REMOVE.THIS.cybersource.com.au>,
> Steven D'Aprano wrote:
> 
>> On Tue, 26 May 2009 18:31:56 +1200, Lawrence D'Oliveiro wrote:
>> 
>>> In message <d6d05d39-98e7-4c28-
>>> b201-4b2445732ab4 at v35g2000pro.googlegroups.com>, LittleGrasshopper
>>> wrote:
>>> 
>>>> ... I am looking for suitable syntax files for [editor of choice] ...
>>> 
>>> I don't understand why people need "syntax files" to use a text
>>> editor.
>> 
>> Do you want syntax highlighting?
> 
> Why?

The human visual system is evolved to detect, and respond to, differences 
in the frequency of light entering the eye. This is called "colour", and 
colour can be used to make certain things stand out more than others, or 
fade more into the background. *wink*

The use of colour not only increases the bandwidth of information 
entering the brain, but it can be used to discriminate between what's 
important and what isn't. Personally, I find that it is worth having 
syntax highlighting just to get comments displayed in grey instead of 
black. Everything else is a bonus: e.g. I can instantly tell if I 
neglected to close a string, because my code displays in red.



-- 
Steven


From paul.nospam at rudin.co.uk  Tue May 26 05:14:35 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Tue, 26 May 2009 10:14:35 +0100
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<pan.2009.05.26.09.10.40@REMOVE.THIS.cybersource.com.au>
Message-ID: <87bppg6xac.fsf@rudin.co.uk>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:

>  e.g. I can instantly tell if I neglected to close a string, because
> my code displays in red.

I like syntax hightlighting for whitespace related things in python. e.g
to highlight tabs, or whitespace at the end of a line.


From paul.nospam at rudin.co.uk  Tue May 26 05:16:32 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Tue, 26 May 2009 10:16:32 +0100
Subject: How to create a list of functions depending on a parameter?
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
	<781pmqF1k8bt5U1@mid.uni-berlin.de>
Message-ID: <877i046x73.fsf@rudin.co.uk>

"Diez B. Roggisch" <deets at nospam.web.de> writes:

> enzo michelangeli schrieb:
>> Let's suppose I want to create a list of n functions of a single
>> argument, returning the sum between argument and index in the list, so
>> that e.g.:
>>
>> f[0](10) will return 10
>> f[3](12) will return 15
>>
>> ...and so on. I had naively though of coding:
>>
>>  f = [lambda x: x+j for j in range(n)]
>>
>> Unfortunately, each function in the list f[]() behaves as a closure,
>> and f[k](p) does NOT return p+k but p+j (for whatever value j has at
>> the moment: typically n, the last value assumed by j in the list
>> comprehension loop).
>>
>> Is there a way of achieving my goal? (Of course, n is not a constant
>> known in advance, so I can't manually unroll the loop.)
>
> You need to capture n into the closure of the lambda:
>
> f = [lambda x, n=n: x+j for j in xrange(n)]
>

But be careful using such a technique with mutable arguments...



From arnodel at googlemail.com  Tue May 26 05:20:41 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 26 May 2009 10:20:41 +0100
Subject: How to create a list of functions depending on a parameter?
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
	<781pmqF1k8bt5U1@mid.uni-berlin.de>
Message-ID: <m2hbz82pau.fsf@googlemail.com>

"Diez B. Roggisch" <deets at nospam.web.de> writes:

> You need to capture n into the closure of the lambda:
>
> f = [lambda x, n=n: x+j for j in xrange(n)]

You mean  [lambda x, j=j: x+j for j in xrange(n)]

Another way would be [(lambda j:lambda x: x+j)(j) for j in xrange(n)]

Or more readably:

def adder(n):
    return lambda x: x+n

[adder(j) for j in xrange(n)]

-- 
Arnaud


From enzomich at gmail.com  Tue May 26 05:32:05 2009
From: enzomich at gmail.com (enzo michelangeli)
Date: Tue, 26 May 2009 02:32:05 -0700 (PDT)
Subject: How to create a list of functions depending on a parameter?
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
	<781pmqF1k8bt5U1@mid.uni-berlin.de> <m2hbz82pau.fsf@googlemail.com>
Message-ID: <559c69f9-eb2c-4991-9a1a-ecb66ed3eab8@d25g2000prn.googlegroups.com>

Thanks guys. So far I had only come out with

f = [eval('lambda x: x+'+str(j)) for j in range(3)]

...which I hated because, as everybody knows, eval is evil :-)

Enzo

On May 26, 5:20?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
> "Diez B. Roggisch" <de... at nospam.web.de> writes:
>
> > You need to capture n into the closure of the lambda:
>
> > f = [lambda x, n=n: x+j for j in xrange(n)]
>
> You mean ?[lambda x, j=j: x+j for j in xrange(n)]
>
> Another way would be [(lambda j:lambda x: x+j)(j) for j in xrange(n)]
>
> Or more readably:
>
> def adder(n):
> ? ? return lambda x: x+n
>
> [adder(j) for j in xrange(n)]
>
> --
> Arnaud



From youhvee at googlemail.com  Tue May 26 05:45:40 2009
From: youhvee at googlemail.com (youhvee at googlemail.com)
Date: Tue, 26 May 2009 02:45:40 -0700 (PDT)
Subject: A list with periodic boundary conditions
References: <0f324d00-875a-4d18-bd8b-981997a34e44@q14g2000vbn.googlegroups.com>
	<mailman.539.1242948009.8015.python-list@python.org>
Message-ID: <32856758-88db-427a-9df0-99b6b3f791f9@m17g2000vbi.googlegroups.com>


Rodhri,

thank you very much for your reply. I've tried to extend what you
suggested; I think it can be made to work, but you're right -- it gets
horrid rapidly. I'm at the start of what promises to be a large
project, and I want to make sure that I get my data structures right,
but my impression right now is that the memory efficiency of views is
negated by the computational complexity of their implementation. So I
think I will stick to copies and be done with it.

For the record, part of the reason I wanted a view was that my class
will be inherited from numpy.ndarray, where, by default, slices return
views.

Thanks again,

-AM

On 22 May, 00:20, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> On Thu, 21 May 2009 13:08:39 +0100, <youh... at googlemail.com> wrote:
> > Hi,
>
> > I'm trying to create a new class of list that has periodic boundary
> > conditions.
>
> > Here's what I have so far:
>
> > class wrappedList(list):
> > ? ? def __getitem__(self, p):
> > ? ? ? ? return list.__getitem__(self, p%len(self))
> > ? ? def __setitem__(self, p, v):
> > ? ? ? ? list.__setitem__(self, p%len(self), v)
>
> >>>>> a=wrappedList(range(10))
> >>>>> a[1]
> > 1
> >>>>> a[11]
> > 1
>
> > But I would also like to make slices. For instance I would like
> >>>>> a[8:11]
> > [8, 9, 0]
>
> > I can do it by copying, but I want to return a view to the original
> > data, and I have no idea where to start. It seems that the slice needs
> > to retain some knowledge of the list from which it derived. i.e. it
> > needs to know that it is a slice. Any ideas on how I can extend this
> > to allow views?
>
> Reading the docs, this looks like a very messy area of Python 2.x in
> that for a builtin like `list` you have to provide a __getslice__ method
> despite it being deprecated and only dealing with simple slices. ?Good
> luck with that. ?In Python 3, you just have to deal with the fact that
> your __getitem__ and __setitem__ `p` arguments can be slice objects
> instead of integers.
>
> If you're set on making your slices views on the original (which means
> that changes to the slice will change the original, unlike normal lists!)
> then you need to extend your class to remember what it's viewing, and
> what the start, stop and step of the slice were. ?When it's a view, it
> passes (massaged) requests up to its parent. ?There's a cute (but likely
> inefficient) way of doing this that uses the fact that your view is still
> a list under the hood, and stashes the parental indices in it. ?This will
> also make len() work correctly, for a bonus :-) ?It gets quite horrid
> quite fast, but here's a very incomplete untested skeleton:
>
> class wrappedList(list):
> ? ?def __init__(self, parent=None, *args):
> ? ? ?list.__init__(self, *args)
> ? ? ?self.parent = parent
>
> ? ?def __getitem__(self, p):
> ? ? ?if self.parent is None:
> ? ? ? ?self.primary_getitem(p)
> ? ? ?else:
> ? ? ? ?self.view_getitem(p)
>
> ? ?def view_getitem(self, p):
> ? ? ?return self.parent[list.__getitem__(self, p%len(self))]
>
> ...and similarly for __setitem__, where primary_getitem() is your
> previous __getitem__ method. ?All four need to be modified to cope
> with slices, of course, and to create new wrappedList objects.
> Something like this:
>
> ? ?if isinstance(p, slice):
> ? ? ?if p.start is None:
> ? ? ? ?start = 0
> ? ? ?else:
> ? ? ? ?start = p.start
> ? ? ?if p.step is None:
> ? ? ? ?step = 1
> ? ? ?else:
> ? ? ? ?step = p.step
> ? ? ?indices = range(start, p.stop, step)
> ? ? ?return wrappedList(indices, parent=self)
>
> This will go horribly, horribly wrong if you delete anything from
> your original list, but I can't off-hand think of a view method
> that won't.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses



From debatem1 at gmail.com  Tue May 26 06:00:21 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 26 May 2009 03:00:21 -0700 (PDT)
Subject: Network programming ?
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
Message-ID: <a4ec6a83-7624-4529-ba1d-09b137376b78@k2g2000yql.googlegroups.com>

On May 25, 11:05?pm, thushiantha... at gmail.com wrote:
> Hi everyone,
>
> I am planning to develop a chatting software in Python, for my college
> project. I am using Windows Vista. Is it possible to do sockets
> programming in Python ? Any books or websites ? ?Also, i want to
> develop a gui for that program. What are the gui tool kits available
> for windows? I already knew about PyGtk and PyQT, but will they work
> properly in Windows platform? Any suggestions?
>
> Thank you. Excuse my English.

There's a book called Foundations of Python Network Programming that
is
pretty much as good a book as you could ever ask for on the subject. I
strongly recommend it, and I think you'll find many of the examples
relevant.

As far as PyGTK and PyQT, my understanding is that they will work, but
require some effort. You may want to look at PyGUI, which I haven't
used
but have consistently heard good things about- they seem to have good
windows support.

Geremy Condra


From bruno.42.desthuilliers at websiteburo.invalid  Tue May 26 06:06:05 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 26 May 2009 12:06:05 +0200
Subject: Are Python-based web frameworks reliable enough?
In-Reply-To: <7opl151anck3qve09uu88t67khgbd9ob1t@4ax.com>
References: <7opl151anck3qve09uu88t67khgbd9ob1t@4ax.com>
Message-ID: <4a1bbf08$0$20352$426a74cc@news.free.fr>

Gilles Ganault a ?crit :
> Hello
> 
> 	Until now, the modest web apps I wrote were all in PHP because it's
> available on just about any hosted server.
> 
> I now have a couple of ideas for applications where I would deploy my
> own servers, so that I'd rather write them in Python because I find
> the language more pleasant to write with.
> 
> I read that the traction for the mod_python module isn't as strong as
> mod_php, so I guess I should consider the alternative, which is
> writing a long-running process with some framework like TurboGears or
> Django.
> 
> To make an informed choice, I'd like your feedback on this:
> 
> 1. Is mod_python a bad choice today? If yes, are there other PHP-like
> modules available, ie. the Python code is hosted in pages that are
> loaded every time a user calls them?

I indeed wouldn't use mod_python for web app development, unless I need 
really strong integration with apache and don't care for portability (=> 
  deploying on other web servers).

And while we're at it, the server page model (PHP etc) is just braindead 
for anything more complicated than a simple personal home page. FWIW, 
even PHP coders tend to go away from it and turn to more "structured" 
frameworks like Symfony or CakePHP - which look much more like Django, 
TG, Pylons or (for CakePHP) Ruby On Rails.

> 2. If you think I should consider long-running processes, are the
> frameworks reliable enough so that I shouldn't fear crashes every so
> often?

My experience is that they are usually much more reliable than most PHP 
code around.

> 3. What about performance as compared to equivalent PHP/MySQL apps?

The right question here would be "what about performances as compared to 
equivalent PHP apps of equivalent quality written using similar 
frameworks, deployed on equivalent web servers and getting equivalent 
loads".

Ok, to make a long story short: I never had any performance issues so 
far with app written in Django, and never heard of anyone reporting such 
issues. <troll>I whish I could say the same about Zope/Plone...</troll>


From jeanmichel at sequans.com  Tue May 26 06:24:14 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 26 May 2009 12:24:14 +0200
Subject: which database is suitable for small applications
In-Reply-To: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
Message-ID: <4A1BC34E.2010201@sequans.com>

Kalyan Chakravarthy wrote:
> Hi All,
>           can any one suggest me which database I can use for my small 
> application(to store user names ,passwords, very few other data.. )
> I am using Python, Google Apps and guide me how to connect to 
> database, I am very new to these technologies
>
> Please help me
>
> Thanks in advance
>
> -- 
> Regards
> Kalyan
>
If you are really new to these technologies and don't want to spend some 
time on it, just serialize on the disk your data structure containing 
your names, password and so on (http://docs.python.org/library/pickle.html).
Depending on your application you may not be that concerned with 
security/reliability issues.

Of course if you want to learn more about it, go on. I personally use 
postgreSQL with the pgdb python module. But this is the only one I ever 
used so I'll let someone else more familiar with all the database types 
respond to you.

Jean-Michel


From deets at nospam.web.de  Tue May 26 06:37:47 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 26 May 2009 12:37:47 +0200
Subject: How to create a list of functions depending on a parameter?
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
	<781pmqF1k8bt5U1@mid.uni-berlin.de> <877i046x73.fsf@rudin.co.uk>
Message-ID: <781uvhF1ifcomU1@mid.uni-berlin.de>

Paul Rudin wrote:

> "Diez B. Roggisch" <deets at nospam.web.de> writes:
> 
>> enzo michelangeli schrieb:
>>> Let's suppose I want to create a list of n functions of a single
>>> argument, returning the sum between argument and index in the list, so
>>> that e.g.:
>>>
>>> f[0](10) will return 10
>>> f[3](12) will return 15
>>>
>>> ...and so on. I had naively though of coding:
>>>
>>>  f = [lambda x: x+j for j in range(n)]
>>>
>>> Unfortunately, each function in the list f[]() behaves as a closure,
>>> and f[k](p) does NOT return p+k but p+j (for whatever value j has at
>>> the moment: typically n, the last value assumed by j in the list
>>> comprehension loop).
>>>
>>> Is there a way of achieving my goal? (Of course, n is not a constant
>>> known in advance, so I can't manually unroll the loop.)
>>
>> You need to capture n into the closure of the lambda:
>>
>> f = [lambda x, n=n: x+j for j in xrange(n)]
>>
> 
> But be careful using such a technique with mutable arguments...

What makes "this technique" more susceptible to mutable argument issues than
any other function or method-definition?

Diez


From deets at nospam.web.de  Tue May 26 06:39:08 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 26 May 2009 12:39:08 +0200
Subject: How to create a list of functions depending on a parameter?
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
	<781pmqF1k8bt5U1@mid.uni-berlin.de> <m2hbz82pau.fsf@googlemail.com>
Message-ID: <781v22F1ifcomU2@mid.uni-berlin.de>

Arnaud Delobelle wrote:

> "Diez B. Roggisch" <deets at nospam.web.de> writes:
> 
>> You need to capture n into the closure of the lambda:
>>
>> f = [lambda x, n=n: x+j for j in xrange(n)]
> 
> You mean  [lambda x, j=j: x+j for j in xrange(n)]


Ah, sorry, parentheses-problem.

Diez




From ldo at geek-central.gen.new_zealand  Tue May 26 07:35:55 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 26 May 2009 23:35:55 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
Message-ID: <gvgk6s$bpr$1@lust.ihug.co.nz>

In message <mailman.741.1243325683.8015.python-list at python.org>, Hendrik van 
Rooyen wrote:

> "Lawrence D'Oliveiro" <ldo at geek....new_zealand> wrote:
>> 
>> Why [do you want syntax highlighting]?
> 
> It makes your screen look more busy as you type - for instance, if you
> type a " or a ' then it treats the rest of the file from that point on as
> belonging to the same string you are about to start typing, and colours it
> all using the colour you have selected for displaying string literals.
> This is basically to make you seasick and to force you to type the closing
> quote immediately and then to back arrow to inside the string again to
> finish typing the string, thereby making sure that firstly you type more
> keystrokes, which will look good on your productivity summary, and
> secondly to save the Python parser the hassle of dealing with a string
> that has no end quote.

Yeah, that's about what I figured. I think I first came across it 15 years 
ago in Metrowerks CodeWarrior. I tried it for a while, but it didn't really 
help with any of my program bugs, so I turned it off.




From John at nospam.net  Tue May 26 07:42:01 2009
From: John at nospam.net (John)
Date: Tue, 26 May 2009 07:42:01 -0400
Subject: What is the difference between init and enter?
Message-ID: <gvgkiv$61t$1@aioe.org>

I'm okay with init, but it seems to me that enter is redundant since it 
appears that anything you want to execute in enter can be done in init.


From gabriel.rossetti at arimaz.com  Tue May 26 07:46:49 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Tue, 26 May 2009 13:46:49 +0200
Subject: DB-API execute params, am I missing something?
Message-ID: <4A1BD6A9.8090809@arimaz.com>

Hello everyone, I am trying to use dbapi with mysql and I get this error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 2, in getUnitParams
  File "/var/lib/python-support/python2.5/MySQLdb/cursors.py", line 151, 
in execute
    query = query % db.literal(args)
TypeError: int argument required

with this code :

import MySQLdb

def getParams(curs):
    curs.execute("select * from param where id=%d", 1001)
    return curs.fetchall()

cp = MySQLdb.connect(host="localhost",
                     port=3306,
                     user="root",
                     passwd="123",
                     db="test")

curs = cp.cursor()
result = getParams(curs)

I checked MySQLdb.paramstyle and it uses "format". I also tried passing 
(1001,) instead of just 1001 as the param but this changes nothing. What 
am I doing wrong?

Thank you,
Gabriel


From kushal.kumaran at gmail.com  Tue May 26 07:50:17 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Tue, 26 May 2009 17:20:17 +0530
Subject: which database is suitable for small applications
In-Reply-To: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
Message-ID: <1e364c4e0905260450p271c3079wfc5a0acac1ad9491@mail.gmail.com>

On Tue, May 26, 2009 at 2:03 PM, Kalyan Chakravarthy
<kalyanchakravarthy at hyit.com> wrote:
> Hi All,
> ????????? can any one suggest me which database I can use for my small
> application(to store user names ,passwords, very few other data.. )
> I am using Python, Google Apps and guide me how to connect to database, I am
> very new to these technologies
>

Going by your previous mail, I assume you meant Google App Engine when
you said Google Apps.  Given that, searching for google app engine
database gives http://code.google.com/appengine/docs/python/gettingstarted/usingdatastore.html
as the first result.

-- 
kushal


From deets at nospam.web.de  Tue May 26 07:52:41 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 26 May 2009 13:52:41 +0200
Subject: What is the difference between init and enter?
References: <gvgkiv$61t$1@aioe.org>
Message-ID: <7823bvF1k6ml9U1@mid.uni-berlin.de>

John wrote:

> I'm okay with init, but it seems to me that enter is redundant since it
> appears that anything you want to execute in enter can be done in init.

About what are you talking? 

Diez


From Lacrima.Maxim at gmail.com  Tue May 26 08:07:23 2009
From: Lacrima.Maxim at gmail.com (Lacrima)
Date: Tue, 26 May 2009 05:07:23 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
Message-ID: <9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>

I am new to python.
And now I am using trial version of Wing IDE.
But nobody mentioned it as a favourite editor.
So should I buy it when trial is expired or there are better choices?


From skip at pobox.com  Tue May 26 08:12:04 2009
From: skip at pobox.com (skip at pobox.com)
Date: Tue, 26 May 2009 07:12:04 -0500
Subject: email scanning for X-Spam-Score
In-Reply-To: <77vc0bF1ikvrgU1@mid.dfncis.de>
References: <77vc0bF1ikvrgU1@mid.dfncis.de>
Message-ID: <18971.56468.629602.606367@montanaro.dyndns.org>

    Helmut>    mailmsg = email.message_from_string(msg)
    Helmut>    SPAM_CORE = mailmsg['X-Spam-Score']

Maybe lower case?

    SPAM_CORE = mailmsg['x-spam-score']

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/
    America's vaunted "free press" notwithstanding, story ideas that expose
    the unseemly side of actual or potential advertisers tend to fall by the
    wayside.  Not quite sure why.  -- Jim Thornton


From konrad.hinsen at laposte.net  Tue May 26 08:19:07 2009
From: konrad.hinsen at laposte.net (Konrad Hinsen)
Date: Tue, 26 May 2009 14:19:07 +0200
Subject: Building Python with icc on 64-bit Linux
Message-ID: <1DFB4A5E-0A88-4473-BB37-A5E4A668BF8E@laposte.net>

I am trying to install Python 2.6.2 on a 64-bit Linux machine (RedHat  
Enterprise) using the Intel compiler (version 11). Even without  
optimizations (-O0), I get a compilation error in the ctypes module

icc -pthread -fPIC -fno-strict-aliasing -DNDEBUG -O0 -I. -I/home/shr/ 
khinsen/tm\
p/Python-2.6.2/./Include -Ibuild/temp.linux-x86_64-2.6/libffi/include  
-Ibuild/t\
emp.linux-x86_64-2.6/libffi -I/home/shr/khinsen/tmp/Python-2.6.2/ 
Modules/_ctype\
s/libffi/src -I. -IInclude -I./Include -I/usr/local/include -I/home/ 
shr/khinsen\
/tmp/Python-2.6.2/Include -I/home/shr/khinsen/tmp/Python-2.6.2 -c / 
home/shr/khi\
nsen/tmp/Python-2.6.2/Modules/_ctypes/libffi/src/x86/ffi64.c -o build/ 
temp.linu\
x-x86_64-2.6/home/shr/khinsen/tmp/Python-2.6.2/Modules/_ctypes/libffi/ 
src/x86/f\
fi64.o
/home/shr/khinsen/tmp/Python-2.6.2/Modules/_ctypes/libffi/src/x86/ 
ffi64.c(43): \
error: identifier "__int128_t" is undefined
     __int128_t sse[MAX_SSE_REGS];
     ^
compilation aborted for /home/shr/khinsen/tmp/Python-2.6.2/Modules/ 
_ctypes/libf\
fi/src/x86/ffi64.c (code 2)


and failed test:

test test_cmath failed -- Traceback (most recent call last):
   File "/home/shr/khinsen/tmp/Python-2.6.2/Lib/test/test_cmath.py",  
line 366, i\
n test_specific_values
     self.fail(error_message)
AssertionError: acos0000: acos(complex(0.0, 0.0))
Expected: complex(1.5707963267948966, -0.0)
Received: complex(1.5707963267948966, 0.0)
Received value insufficiently close to expected value.


Adding optimization yields even more failed tests. My configuration  
options are:

	configure --prefix=$HOME CC=icc CXX=icc OPT=-O0

Did anyone encounter these problems before? Any solutions?

Thanks,
   Konrad.


From deets at nospam.web.de  Tue May 26 08:46:39 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 26 May 2009 14:46:39 +0200
Subject: DB-API execute params, am I missing something?
References: <mailman.745.1243338813.8015.python-list@python.org>
Message-ID: <7826h5F1kcp57U1@mid.uni-berlin.de>

Gabriel Rossetti wrote:

> Hello everyone, I am trying to use dbapi with mysql and I get this error:
> 
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "<stdin>", line 2, in getUnitParams
>   File "/var/lib/python-support/python2.5/MySQLdb/cursors.py", line 151,
> in execute
>     query = query % db.literal(args)
> TypeError: int argument required
> 
> with this code :
> 
> import MySQLdb
> 
> def getParams(curs):
>     curs.execute("select * from param where id=%d", 1001)
>     return curs.fetchall()
> 
> cp = MySQLdb.connect(host="localhost",
>                      port=3306,
>                      user="root",
>                      passwd="123",
>                      db="test")
> 
> curs = cp.cursor()
> result = getParams(curs)
> 
> I checked MySQLdb.paramstyle and it uses "format". I also tried passing
> (1001,) instead of just 1001 as the param but this changes nothing. What
> am I doing wrong?

AFAIK you need to use %s, regardless of what type you pass.

Diez


From python.list at tim.thechases.com  Tue May 26 08:58:34 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 26 May 2009 07:58:34 -0500
Subject: which database is suitable for small applications
In-Reply-To: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
Message-ID: <4A1BE77A.6030606@tim.thechases.com>

>           can any one suggest me which database I can use for my small
> application(to store user names ,passwords, very few other data.. )
> I am using Python, Google Apps and guide me how to connect to database, I am
> very new to these technologies

Well, depending on the complexity you need, you can use either 
the standard  "anydbm" module for simple, persistent key-value 
string-to-string mappings; or you can use the "sqlite3" module 
for a more full-fledged SQL experience with a local data-store. 
If you need to step up to a shared database, you can investigate 
the various MySQL, PostgreSQL, etc. bindings that can be added to 
Python.

You can read about both the "anydbm" and "sqlite3" modules (along 
with example code) in the standard library reference docs.

-tkc





From james at agentultra.com  Tue May 26 09:04:08 2009
From: james at agentultra.com (J Kenneth King)
Date: Tue, 26 May 2009 09:04:08 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <85d49wf22f.fsf@agentultra.com>

Lacrima <Lacrima.Maxim at gmail.com> writes:

> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

That is a slightly better question.

Try some of the free alternatives.  I do happen to use emacs.  It took
me quite a lot of adjusting to get used to it after being a vim user
for almost ten years.  Doesn't cost anything to give one a shot and
see if it works for you.  The choice of editor is a personal one
(hence the reluctance to answer your original question).


From ken at seehart.com  Tue May 26 09:14:34 2009
From: ken at seehart.com (Ken Seehart)
Date: Tue, 26 May 2009 06:14:34 -0700
Subject: What is the difference between init and enter?
In-Reply-To: <7823bvF1k6ml9U1@mid.uni-berlin.de>
References: <gvgkiv$61t$1@aioe.org> <7823bvF1k6ml9U1@mid.uni-berlin.de>
Message-ID: <4A1BEB3A.9080302@seehart.com>

Diez B. Roggisch wrote:
> John wrote:
>
>   
>> I'm okay with init, but it seems to me that enter is redundant since it
>> appears that anything you want to execute in enter can be done in init.
>>     
>
> About what are you talking? 
>
> Diez
>   
Presumably, the 'with' statement.  http://www.python.org/dev/peps/pep-0343/

    *__enter__*(self)

    Enter the runtime context related to this object. The *with*
    <http://effbot.org/pyref/with.htm> statement will bind this method's
    return value to the target(s) specified in the *as*
    <http://effbot.org/pyref/as.htm> clause of the statement, if any.


Unlike __init__,  __enter__ can return a value, which is assigned to the 
variable (or tuple) following the 'as' keyword:

        with EXPR as VAR:
            BLOCK

Also, the object used in a with statement can be constructed prior to 
the with statement.  The __init__ method is called when the object is 
initialized, but the __enter__ method is called when the context is 
entered (i.e. when the 'with' statement is invoked).

Ken

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From james at agentultra.com  Tue May 26 09:16:35 2009
From: james at agentultra.com (J Kenneth King)
Date: Tue, 26 May 2009 09:16:35 -0400
Subject: which database is suitable for small applications
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
	<mailman.744.1243333471.8015.python-list@python.org>
Message-ID: <853aasf1ho.fsf@agentultra.com>

Jean-Michel Pichavant <jeanmichel at sequans.com> writes:

> Kalyan Chakravarthy wrote:
>> Hi All,
>>           can any one suggest me which database I can use for my
>> small application(to store user names ,passwords, very few other
>> data.. )
>> I am using Python, Google Apps and guide me how to connect to
>> database, I am very new to these technologies
>>
>> Please help me
>>
>> Thanks in advance
>>
>> -- 
>> Regards
>> Kalyan
>>
> If you are really new to these technologies and don't want to spend
> some time on it, just serialize on the disk your data structure
> containing your names, password and so on
> (http://docs.python.org/library/pickle.html).
> Depending on your application you may not be that concerned with
> security/reliability issues.
>
> Of course if you want to learn more about it, go on. I personally use
> postgreSQL with the pgdb python module. But this is the only one I
> ever used so I'll let someone else more familiar with all the database
> types respond to you.
>
> Jean-Michel

sqlite is also a pretty lite database. Sits in a single file and the
libraries ship with Python (> 2.6 I think? or maybe 2.5?).

Serialization is always a neat option. With a hash table DB like
berkeley or some such you can get a pretty speedy (albeit simple)
persistence layer.

Really depends on what your app needs.


From roy at panix.com  Tue May 26 09:22:29 2009
From: roy at panix.com (Roy Smith)
Date: Tue, 26 May 2009 09:22:29 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
Message-ID: <roy-92C5E8.09222926052009@news.panix.com>

In article <mailman.741.1243325683.8015.python-list at python.org>,
 "Hendrik van Rooyen" <mail at microcorp.co.za> wrote:

> [syntax coloring] makes your screen look more busy as you type - for instance, if you
> type a " or a ' then it treats the rest of the file from that point on as 
> belonging to the same string you are about to start typing, and colours it
> all using the colour you have selected for displaying string literals.
> This is basically to make you seasick and to force you to type the closing
> quote immediately 

Good syntax coloring implementations have some hysteresis built in, to 
prevent transient things (like strings you haven't closed yet) from 
changing the entire file.  If you stop typing for a while, it then does a 
full update.  This avoids the problem above.

That being said, syntax coloring is like any other tool.  It's worth 
trying, but if you find it hinders you more than it helps, turn it off.  
Different strokes for different folks.

My pet peeve is syntax-aware editors which get things wrong.  For example, 
the version of emacs I'm using now doesn't parse this properly:

'''A triple-quoted string.  Some editors won't get this right'''

The solution is to change the outer quotes to double-quotes, but it annoys 
me when I have to change my code to appease a tool.


From lie.1296 at gmail.com  Tue May 26 09:23:43 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 26 May 2009 13:23:43 GMT
Subject: What is the difference between init and enter?
In-Reply-To: <7823bvF1k6ml9U1@mid.uni-berlin.de>
References: <gvgkiv$61t$1@aioe.org> <7823bvF1k6ml9U1@mid.uni-berlin.de>
Message-ID: <z3SSl.13783$y61.2066@news-server.bigpond.net.au>

Diez B. Roggisch wrote:
> John wrote:
> 
>> I'm okay with init, but it seems to me that enter is redundant since it
>> appears that anything you want to execute in enter can be done in init.
> 
> About what are you talking? 
> 
> Diez

Do you mean __init__ and __enter__?

They are used for two completely different purpose. __init__ is used to 
initialize an object when they've just been created. __enter__ is called 
when an object enters a Context Manager (i.e. with statement)

Example, when opening a file:

# this calls file.__init__
f = open('foo.bar')

# some codes...

# this calls file.__enter__
with f:
     pass



From jeanmichel at sequans.com  Tue May 26 09:25:04 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 26 May 2009 15:25:04 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <4A1BEDB0.6000100@sequans.com>

Why buy an IDE when you just need a text editor ? I don't get it.
Anyway gvim (aka vim aka vi) and emacs are the most powerful editors for 
years. Both have Windows and Linux version and most important, they both 
are very effective at editing any file type (python, C, latex, love 
letters...)
Emacs is more accessible to the newby but requires time to master its 
complex features.
Gvim may be complex for the newby due to its command/insertion mode 
constant switch, but is as powerful as emacs can be. Being a gvim adept, 
I should stat that gvim is far better but it would only feed the 
neverending war.

Jean-Michel


Lacrima wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?
>   



From ken at seehart.com  Tue May 26 09:34:27 2009
From: ken at seehart.com (Ken Seehart)
Date: Tue, 26 May 2009 06:34:27 -0700
Subject: What text editor is everyone using for Python
In-Reply-To: <9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <4A1BEFE3.10500@seehart.com>

Lacrima wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?
>   
It's my favorite.  Buy it.  I'm not aware of any better choices.

If you can afford the Pro version buy that, especially if you are 
planning any large projects.  But take a peek at the feature list before 
making that decision: http://www.wingware.com/wingide/features .  Some 
of my favorite Pro features are test suite support, advanced debugging, 
and code folding.  The debugger is way more powerful in the Pro version.

Of course, favorites are ultimately determined by religious preference.

Ken



From Scott.Daniels at Acm.Org  Tue May 26 09:35:51 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 26 May 2009 06:35:51 -0700
Subject: Regarding sort()
In-Reply-To: <mailman.711.1243244643.8015.python-list@python.org>
References: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>	<97a8f1a70905250051o44266248k2f8c35c017fbf638@mail.gmail.com>	<50697b2c0905250115kb3bd9abq662c09ecd29763cb@mail.gmail.com>
	<mailman.711.1243244643.8015.python-list@python.org>
Message-ID: <AO6dna4bRIVDc4bXnZ2dnUVZ_t-dnZ2d@pdx.net>

Jaime Fernandez del Rio wrote:
>... the reasons are starting to pile to fare 2.6 goodbye and move on to 3.0...
If you wait just a bit (TM)*, you'd be better served to move on to
3.1.  I think 3.0 is for learning, both for Python developers and
users, and has less "fit and polish" than previous Python releases.
Between 2.x and 3.0, there were huge changes, and some substantial
restructuring.  The move to Unicode strings was not without its
bumps and bruises, and efficiency was (quite properly) by no means
the top priority.  As a result, "normal" file I/O on 3.0 is slowed,
and getting that fixed was not a priority (as correctness was plenty
of work).

I'd view 3.0 as the first real-world view of Python 3000, and 3.1 as
getting the surprise burs and sharp edges of 3.0 cleaned up a bit.


* 3.1 is already in beta, according to PEP 375, the first release
   candidate is coming 30-May, with final release on 27-June:
       http://python.org/dev/peps/pep-0375

--Scott David Daniels
Scott.Daniels at Acm.Org


From kyosohma at gmail.com  Tue May 26 09:40:48 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 26 May 2009 06:40:48 -0700 (PDT)
Subject: which database is suitable for small applications
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com> 
	<mailman.744.1243333471.8015.python-list@python.org>
	<853aasf1ho.fsf@agentultra.com>
Message-ID: <cd7541b4-cbd9-47a0-b81b-37b84fe23e58@o30g2000vbc.googlegroups.com>

On May 26, 8:16?am, J Kenneth King <ja... at agentultra.com> wrote:
> Jean-Michel Pichavant <jeanmic... at sequans.com> writes:
> > Kalyan Chakravarthy wrote:
> >> Hi All,
> >> ? ? ? ? ? can any one suggest me which database I can use for my
> >> small application(to store user names ,passwords, very few other
> >> data.. )
> >> I am using Python, Google Apps and guide me how to connect to
> >> database, I am very new to these technologies
>
> >> Please help me
>
> >> Thanks in advance
>
> >> --
> >> Regards
> >> Kalyan
>
> > If you are really new to these technologies and don't want to spend
> > some time on it, just serialize on the disk your data structure
> > containing your names, password and so on
> > (http://docs.python.org/library/pickle.html).
> > Depending on your application you may not be that concerned with
> > security/reliability issues.
>
> > Of course if you want to learn more about it, go on. I personally use
> > postgreSQL with the pgdb python module. But this is the only one I
> > ever used so I'll let someone else more familiar with all the database
> > types respond to you.
>
> > Jean-Michel
>
> sqlite is also a pretty lite database. Sits in a single file and the
> libraries ship with Python (> 2.6 I think? or maybe 2.5?).
>

Sqlite starting shipping with Python 2.5.

I use SqlAlchemy to connect to Microsoft SQL 2000 right now, but I
used to use the mssql and adodb modules. The latter two worked for
what I needed, although I was always running to escaping issues with
them. SqlAlchemy is nice because it does all that for you and you can
switch database back-ends with little to no change in your code.

- Mike


From mwilson at the-wire.com  Tue May 26 09:43:00 2009
From: mwilson at the-wire.com (Mel)
Date: Tue, 26 May 2009 09:43 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <gvgrl2$15je$1@services.telesweet.net>

LittleGrasshopper wrote:

> With so many choices, I was wondering what editor is the one you
> prefer when coding Python, and why. I normally use vi, and just got
> into Python, so I am looking for suitable syntax files for it, and
> extra utilities. I dabbled with emacs at some point, but couldn't get
> through the key bindings for commands. I've never tried emacs with vi
> keybindings (I forgot the name of it) but I've been tempted.
> 
> So what do you guys use, and why? Hopefully we can keep this civil.
 SciTE
I like one big uncomplicated window, tabbed file panes, syntax coloring and 
help with indentation.  There's nothing to it I hate.  It would be nice if 
customization were easier.

	Mel.




From thushianthan15 at gmail.com  Tue May 26 09:48:06 2009
From: thushianthan15 at gmail.com (thushianthan15 at gmail.com)
Date: Tue, 26 May 2009 06:48:06 -0700 (PDT)
Subject: Network programming ?
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
	<a4ec6a83-7624-4529-ba1d-09b137376b78@k2g2000yql.googlegroups.com>
Message-ID: <dad7d795-9b32-4261-acdf-7b8a70c7f07d@r34g2000vbi.googlegroups.com>

Thank you, for all your support.

I will try wxPython with the sockets module.

thushanthan.


From arnodel at googlemail.com  Tue May 26 09:58:36 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 26 May 2009 14:58:36 +0100
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<gvgk6s$bpr$1@lust.ihug.co.nz>
Message-ID: <m2d49w2cfn.fsf@googlemail.com>

Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> writes:

> In message <mailman.741.1243325683.8015.python-list at python.org>, Hendrik van 
> Rooyen wrote:
>
>> "Lawrence D'Oliveiro" <ldo at geek....new_zealand> wrote:
>>> 
>>> Why [do you want syntax highlighting]?
>> 
>> It makes your screen look more busy as you type - for instance, if you
>> type a " or a ' then it treats the rest of the file from that point on as
>> belonging to the same string you are about to start typing, and colours it
>> all using the colour you have selected for displaying string literals.
>> This is basically to make you seasick and to force you to type the closing
>> quote immediately and then to back arrow to inside the string again to
>> finish typing the string, thereby making sure that firstly you type more
>> keystrokes, which will look good on your productivity summary, and
>> secondly to save the Python parser the hassle of dealing with a string
>> that has no end quote.
>
> Yeah, that's about what I figured. I think I first came across it 15 years 
> ago in Metrowerks CodeWarrior. I tried it for a while, but it didn't really 
> help with any of my program bugs, so I turned it off.

It's a bit like the colour-coding of electrical cables - distracting
more than anything else!  And don't start me on traffic lights...  They
nearly give me an epileptic fit each time.

That's why I use ed.  Ed is the standard text editor [1].  Ed is open
source [2].

[1] http://www.gnu.org/fun/jokes/ed.msg
[2] http://www.gnu.org/fun/jokes/ed

-- 
Arnaud


From karthik167 at gmail.com  Tue May 26 10:18:04 2009
From: karthik167 at gmail.com (karthik167 at gmail.com)
Date: Tue, 26 May 2009 07:18:04 -0700 (PDT)
Subject: large array in a single line
Message-ID: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>

I would like to have a txt file of single line with
[1 2 3 .........100]

I try something like
q=arange(100)
fl=file('tmp.ext','w')
fl.writelines(str(q))
fl.close()

Unfortunately my output is

[ 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22
23 24
 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
48 49
 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
73 74
 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
98 99]

ie there is automatic split in line after 76 characters. How do I
avoid it? Thanks.


From Scott.Daniels at Acm.Org  Tue May 26 10:20:33 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 26 May 2009 07:20:33 -0700
Subject: How to create a list of functions depending on a parameter?
In-Reply-To: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
Message-ID: <PqGdnTAVar7FZIbXnZ2dnUVZ_jGdnZ2d@pdx.net>

enzo michelangeli wrote:
> Let's suppose I want to create a list of n functions of a single
> argument, returning the sum between argument and index in the list, so
> that e.g.:
> 
> f[0](10) will return 10
> f[3](12) will return 15
> 
> ...and so on. I had naively though of coding:
> 
>  f = [lambda x: x+j for j in range(n)]

OK, first, almost a joke (unless you really need what you say):
     f = [j.__add__ for j in range(n)]

And now the one various others are missing:

     def add(x, y):
         '''replace with the function you actually want'''
         return x + y

     f = [functools.partial(add, n) for n in range(0)]

--Scott David Daniels
Scott.Daniels at Acm.Org


From arnodel at googlemail.com  Tue May 26 10:26:12 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 26 May 2009 15:26:12 +0100
Subject: large array in a single line
References: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
Message-ID: <m28wkk2b5n.fsf@googlemail.com>

karthik167 at gmail.com writes:

> I would like to have a txt file of single line with
> [1 2 3 .........100]
>
> I try something like
> q=arange(100)
> fl=file('tmp.ext','w')
> fl.writelines(str(q))
> fl.close()
>
> Unfortunately my output is
>
> [ 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22
> 23 24
>  25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
> 48 49
>  50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
> 73 74
>  75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
> 98 99]
>
> ie there is automatic split in line after 76 characters. How do I
> avoid it? Thanks.

You need to tell us more about the arange() function you use and what
object it returns.

-- 
Arnaud


From gherron at islandtraining.com  Tue May 26 10:48:27 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Tue, 26 May 2009 07:48:27 -0700
Subject: What is the difference between init and enter?
In-Reply-To: <gvgkiv$61t$1@aioe.org>
References: <gvgkiv$61t$1@aioe.org>
Message-ID: <4A1C013B.7060605@islandtraining.com>

John wrote:
> I'm okay with init, but it seems to me that enter is redundant since 
> it appears that anything you want to execute in enter can be done in 
> init.

The proper response to a question like this has to be
    http://www.catb.org/~esr/faqs/smart-questions.html
as anything else is complete guesswork.



Gary Herron



From matt at tplus1.com  Tue May 26 10:49:29 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Tue, 26 May 2009 14:49:29 GMT
Subject: How to test python snippets in my documents?
Message-ID: <ZjTSl.34029$ZP4.2476@nlpi067.nbdc.sbc.com>

I'm using a homemade script to verify some code samples in my
documentation.  Here it is:

    #! /usr/bin/env python2.6

    # vim: set expandtab ts=4 sw=4 filetype=python:

    import doctest, os, sys

    def main(s):
        "Run doctest.testfile(s, None)"

        return doctest.testfile(s, None)

    if __name__ == "__main__":
        for x in sys.argv[1:]:
            print "testing code excerpts in %s..." % x
            print main(x)


The script checks all the files listed as arguments.  This is OK, but is
there anything better?



From dr.mtarver at ukonline.co.uk  Tue May 26 10:52:44 2009
From: dr.mtarver at ukonline.co.uk (Mark Tarver)
Date: Tue, 26 May 2009 07:52:44 -0700 (PDT)
Subject: scripting and uploading in Python
Message-ID: <3c1f0711-8da8-4610-bf8e-679eff0facf9@21g2000vbk.googlegroups.com>

I've recently purchased a site on a Linux server which runs Python.

Generally I'd like to bring myself up to speed on scripting in
Python.   Any good reads - dead tree or otherwise?

One thing I need to learn is to be able to give folks the power to
upload files onto their own disk space using passwords.

thanks

Mark


From dns4 at cornell.edu  Tue May 26 10:53:51 2009
From: dns4 at cornell.edu (David Smith)
Date: Tue, 26 May 2009 10:53:51 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <gvgvpu$mmq$1@ruby.cit.cornell.edu>

Lacrima wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?


I use Wing IDE and like it.  It very nicely enforces consistent space
indentations and other Python basics that might fall through the cracks
when writing.  I'm not too hot on the auto-suggest, but I haven't seen
any other IDE do better.

--David


From ken at seehart.com  Tue May 26 11:01:36 2009
From: ken at seehart.com (Ken Seehart)
Date: Tue, 26 May 2009 08:01:36 -0700
Subject: large array in a single line
In-Reply-To: <m28wkk2b5n.fsf@googlemail.com>
References: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
	<m28wkk2b5n.fsf@googlemail.com>
Message-ID: <4A1C0450.6040905@seehart.com>

Arnaud Delobelle wrote:
> karthik167 at gmail.com writes:
>
>   
>> I would like to have a txt file of single line with
>> [1 2 3 .........100]
>>
>> I try something like
>> q=arange(100)
>> fl=file('tmp.ext','w')
>> fl.writelines(str(q))
>> fl.close()
>>
>> Unfortunately my output is
>>
>> [ 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22
>> 23 24
>>  25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
>> 48 49
>>  50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
>> 73 74
>>  75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
>> 98 99]
>>
>> ie there is automatic split in line after 76 characters. How do I
>> avoid it? Thanks.
>>     
>
> You need to tell us more about the arange() function you use and what
> object it returns.
>   

That would be *numpy.arange

*Since numpy has it's own idea about formatting, you would have to roll 
your own.

How about:

    q=arange(100)
    *s = '[' + ' '.join([`x` for x in q]) + ']'*
    fl=file('tmp.ext','w')
    fl.*write*(s)
    fl.close()
      

See: http://docs.python.org/tutorial/datastructures.html#list-comprehensions

Incidentally, it's a funny thing that* writelines *coincidentally does 
what you expect it to do when given a string.  I suspect that you need 
to read the documentation on* writelines*:

file.writelines(/sequence/)
    Write a sequence of strings to the file. The sequence can be any
    iterable object producing strings, typically a list of strings.
    There is no return value. (The name is intended to match
    readlines(); writelines() does not add line separators.)

So you are asking it to effectively concatenate the characters in your 
string, (which gives you back your original string), and write the 
result.  Simply using* write *instead would be more efficient in this case.

Ken

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From lie.1296 at gmail.com  Tue May 26 11:01:58 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 26 May 2009 15:01:58 GMT
Subject: How to test python snippets in my documents?
In-Reply-To: <ZjTSl.34029$ZP4.2476@nlpi067.nbdc.sbc.com>
References: <ZjTSl.34029$ZP4.2476@nlpi067.nbdc.sbc.com>
Message-ID: <GvTSl.13794$y61.1116@news-server.bigpond.net.au>

Matthew Wilson wrote:
> I'm using a homemade script to verify some code samples in my
> documentation.  Here it is:
> 
>     #! /usr/bin/env python2.6
> 
>     # vim: set expandtab ts=4 sw=4 filetype=python:
> 
>     import doctest, os, sys
> 
>     def main(s):
>         "Run doctest.testfile(s, None)"
> 
>         return doctest.testfile(s, None)
> 
>     if __name__ == "__main__":
>         for x in sys.argv[1:]:
>             print "testing code excerpts in %s..." % x
>             print main(x)
> 
> 
> The script checks all the files listed as arguments.  This is OK, but is
> there anything better?
> 

maybe glob.glob('*.py')?


From zamnedix at gmail.com  Tue May 26 11:10:18 2009
From: zamnedix at gmail.com (Zamnedix)
Date: Tue, 26 May 2009 08:10:18 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <1a4efed3-e308-4f11-95c2-8209fd186ab0@c7g2000prc.googlegroups.com>

On May 25, 10:35?am, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> With so many choices, I was wondering what editor is the one you
> prefer when coding Python, and why. I normally use vi, and just got
> into Python, so I am looking for suitable syntax files for it, and
> extra utilities. I dabbled with emacs at some point, but couldn't get
> through the key bindings for commands. I've never tried emacs with vi
> keybindings (I forgot the name of it) but I've been tempted.
>
> So what do you guys use, and why? Hopefully we can keep this civil.

Nano! Nano! Nano Revolution!!!


From bsk16 at case.edu  Tue May 26 11:11:05 2009
From: bsk16 at case.edu (Benjamin Kaplan)
Date: Tue, 26 May 2009 11:11:05 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <ec96e1390905260811w6fe47836s7a60d0bba00b0560@mail.gmail.com>

On Tue, May 26, 2009 at 8:07 AM, Lacrima <Lacrima.Maxim at gmail.com> wrote:

> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?


We're mostly talking about text editors, not full-fledged IDEs. Those are
actually 3 different pieces of flame bait right there: favorite text editor,
favorite IDE, and text editors vs. IDEs.

>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From Scott.Daniels at Acm.Org  Tue May 26 11:16:47 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 26 May 2009 08:16:47 -0700
Subject: replacement for execfile
In-Reply-To: <mailman.1309.1185723305.22759.python-list@python.org>
References: <mailman.1286.1185635892.22759.python-list@python.org>	<pan.2007.07.29.03.39.34.703168@REMOVE.THIS.cybersource.com.au>
	<mailman.1309.1185723305.22759.python-list@python.org>
Message-ID: <hoydnZ08pJYUm4HXnZ2dnUVZ_r2dnZ2d@pdx.net>

Alex Popescu wrote:
> "Steven D'Aprano" <steve at REMOVE.THIS.cybersource.com.au> wrote in
> news:pan.2007.07.29.03.39.34.703168 at REMOVE.THIS.cybersource.com.au: 
>> ... you're expecting the users to write working Python code, but
>> you think "import module" is too hard for them?
> 
> That was just a cherry on the cake. The most important part is that 
> through this mechanism the user will be able to configure the framework 
> through normal Python code (very simple API: 3 functions), and not 
> through .ini, .xml or other variants.

I think Steven's point is that you can tell the to define a module with,
for example a setup function.  You then import their module and run
their setup function.  They then have a straightforward environment,
and can, for example do straightforward unit tests on their code if
anything even slightly tricky might be wanted as support code.  I agree
with Steven; much nicer to ask them to define a particular module and go
names inside that module.


--Scott David Daniels
Scott.Daniels at Acm.Org


From ken at seehart.com  Tue May 26 11:17:26 2009
From: ken at seehart.com (Ken Seehart)
Date: Tue, 26 May 2009 08:17:26 -0700
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1BEDB0.6000100@sequans.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com>
Message-ID: <4A1C0806.2090802@seehart.com>


Lacrima wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?
>   

Jean-Michel Pichavant wrote:
> Why buy an IDE when you just need a text editor ? I don't get it.
> Anyway gvim (aka vim aka vi) and emacs are the most powerful editors 
> for years. Both have Windows and Linux version and most important, 
> they both are very effective at editing any file type (python, C, 
> latex, love letters...)
> Emacs is more accessible to the newby but requires time to master its 
> complex features.
> Gvim may be complex for the newby due to its command/insertion mode 
> constant switch, but is as powerful as emacs can be. Being a gvim 
> adept, I should stat that gvim is far better but it would only feed 
> the neverending war.
>
> Jean-Michel
>
I've heard notepad is pretty good.  http://www.notepad.org/

:-) Ken




From karthik167 at gmail.com  Tue May 26 11:19:28 2009
From: karthik167 at gmail.com (karthik167 at gmail.com)
Date: Tue, 26 May 2009 08:19:28 -0700 (PDT)
Subject: large array in a single line
References: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
	<m28wkk2b5n.fsf@googlemail.com>
Message-ID: <a6a9f1a9-e9a0-488e-b5c1-f5a1af0a3e73@b7g2000pre.googlegroups.com>

On May 26, 7:26?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
> karthik... at gmail.com writes:
> > I would like to have a txt file of single line with
> > [1 2 3 .........100]
>
> > I try something like
> > q=arange(100)
> > fl=file('tmp.ext','w')
> > fl.writelines(str(q))
> > fl.close()
>
> > Unfortunately my output is
>
> > [ 0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9 10 11 12 13 14 15 16 17 18 19 20 21 22
> > 23 24
> > ?25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
> > 48 49
> > ?50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
> > 73 74
> > ?75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
> > 98 99]
>
> > ie there is automatic split in line after 76 characters. How do I
> > avoid it? Thanks.
>
> You need to tell us more about the arange() function you use and what
> object it returns.
>
> --
> Arnaud

arange(start, stop=None, step=1, typecode=None)

     Just like range() except it returns an array whose type can be
    specified by the keyword argument typecode.


From benjamin.kaplan at case.edu  Tue May 26 11:27:30 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 26 May 2009 11:27:30 -0400
Subject: Network programming ?
In-Reply-To: <4A1BA1B4.70900@ieee.org>
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
	<4A1BA1B4.70900@ieee.org>
Message-ID: <ec96e1390905260827n7bba356ax21bd772b2b119770@mail.gmail.com>

On Tue, May 26, 2009 at 4:00 AM, Dave Angel <davea at ieee.org> wrote:

> thushianthan15 at gmail.com wrote:
>
>> Hi everyone,
>>
>> I am planning to develop a chatting software in Python, for my college
>> project. I am using Windows Vista. Is it possible to do sockets
>> programming in Python ? Any books or websites ?  Also, i want to
>> develop a gui for that program. What are the gui tool kits available
>> for windows? I already knew about PyGtk and PyQT, but will they work
>> properly in Windows platform? Any suggestions?
>>
>> Thank you. Excuse my English.
>>
>>
>>
> You're asking two very distinct questions, and I hope others will chime in,
> especially with the sockets one.
>
> 1)  There is a module called socket, for low level BSD socket access, and
> it does support Windows (plus Mac OSX, BeOS, OS/2, and "all modern Unix"
> No experience with it, however.
>
> 2) There is tkInterf supplied with Python to do GUI development.  However,
> when I studied the choices I knew about, I picked wxPython.  I don't even
> remember the other choices, because it's hard to learn more than one.
>
> see:  http://www.python.org/
> and http://wiki.wxpython.org/
>
> Both totally free, and with very easy (msi) installers for Windows.
>
> Watch out for versions, though.  If you're goin to run wxPython, you want
> to get Python 2.5x or 2.6x, nothing later.  And many say that  wxPython for
>  2.5x is more stable,
> Then when you download wxPython, you need to get the matching version.
>

There was a problem with manifest files in the original Python 2.6 with
wxPython (Python switched to using Visual Studio 2008, wxPython was still
using an older version). I think they have most of the kinks worked out now.


>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From benjamin.kaplan at case.edu  Tue May 26 11:32:29 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 26 May 2009 11:32:29 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1C0806.2090802@seehart.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com> <4A1C0806.2090802@seehart.com>
Message-ID: <ec96e1390905260832i5e5b3942m4ded14eca9b4c66b@mail.gmail.com>

On Tue, May 26, 2009 at 11:17 AM, Ken Seehart <ken at seehart.com> wrote:

>
> Lacrima wrote:
>
>> I am new to python.
>> And now I am using trial version of Wing IDE.
>> But nobody mentioned it as a favourite editor.
>> So should I buy it when trial is expired or there are better choices?
>>
>>
>
> Jean-Michel Pichavant wrote:
>
>> Why buy an IDE when you just need a text editor ? I don't get it.
>> Anyway gvim (aka vim aka vi) and emacs are the most powerful editors for
>> years. Both have Windows and Linux version and most important, they both are
>> very effective at editing any file type (python, C, latex, love letters...)
>> Emacs is more accessible to the newby but requires time to master its
>> complex features.
>> Gvim may be complex for the newby due to its command/insertion mode
>> constant switch, but is as powerful as emacs can be. Being a gvim adept, I
>> should stat that gvim is far better but it would only feed the neverending
>> war.
>>
>> Jean-Michel
>>
>>  I've heard notepad is pretty good.  http://www.notepad.org/
>

But it's not available on any *real* OS. XP

>
> :-) Ken
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From davea at ieee.org  Tue May 26 11:37:34 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 26 May 2009 11:37:34 -0400
Subject: large array in a single line
In-Reply-To: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
References: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
Message-ID: <4A1C0CBE.30706@ieee.org>

karthik167 at gmail.com wrote:
> I would like to have a txt file of single line with
> [1 2 3 .........100]
>
> I try something like
> q=arange(100)
> fl=file('tmp.ext','w')
> fl.writelines(str(q))
> fl.close()
>
> Unfortunately my output is
>
> [ 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22
> 23 24
>  25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
> 48 49
>  50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
> 73 74
>  75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
> 98 99]
>
> ie there is automatic split in line after 76 characters. How do I
> avoid it? Thanks.
>
>   

I never heard of arange(), but perhaps you meant range() or xrange().  
If so, the first problem is that range(100) starts with 0 and ends just 
before 100, so you only get the values 0 to 99.  So if you need the 
final value to be 100, you need to pass it a 101.

Next problem is that you're using str() on a list.  All that does is try 
to give you some printable representation of the list.  You've observed 
it divides it into lines, but that's arbitrary.  If you want the output 
to look a certain way, build it that way.   Use write instead of 
writelines, and put your own \n at the end.

Create a for loop, iterate over the list q, writing each value with a 
trailing space, and follow the loop with one extra write, containing the 
closing brace, and the newline.

Don't forget the leading brace as well.


Sometimes debugging these things can be easier if you temporarily use 
sys.stdout instead of a file, while you're working on it.




From robert.kern at gmail.com  Tue May 26 11:42:15 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 26 May 2009 10:42:15 -0500
Subject: Optimizing math functions
In-Reply-To: <4A1940D3.3000404@hotmail.com>
References: <gv8tbl$ph3$1@ger.gmane.org> <gv9pda$t3s$1@ger.gmane.org>
	<4A1940D3.3000404@hotmail.com>
Message-ID: <gvh2ko$coe$1@ger.gmane.org>

On 2009-05-24 07:42, Esmail wrote:
> Robert Kern wrote:
>>
>>
>> We have several bounded optimization routines in scipy.
>>
>> http://docs.scipy.org/doc/scipy/reference/optimize.html
>
> Hi Robert,
>
> Thanks for the lead .. I briefly looked at the documentation, but
> before I dig into this more deeply 2 quick questions:
>
> 1. Will is also allow me to maximize a function (I only saw minimum)?

Already answered.

> 2. Will it give me the global minima/maxima?

No, they are local optimizers.

> I only ask because I got all excited to see that R has an optimize
> function but unfortunately it can not deal with multi-modal functions.
> I am trying to come up with some complex test cases for a genetic
> algorithm I'm working with, both for functions using f(x) and f(x,y) over a
> variety of intervals so I would like to have a way to verify results for
> more challenging functions.

You may want to consider using artificial functions with known optima. Here is a 
paper from the ACM Transactions on Mathematical Software doing such:

   http://portal.acm.org/citation.cfm?id=962444
   http://wwwinfo.deis.unical.it/~yaro/GKLS.html
   http://www.netlib.org/toms/829

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From barshirtcliff at gmail.com  Tue May 26 11:49:30 2009
From: barshirtcliff at gmail.com (Bar Shirtcliff)
Date: Tue, 26 May 2009 09:49:30 -0600
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1C0806.2090802@seehart.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com> <4A1C0806.2090802@seehart.com>
Message-ID: <18972.3978.978034.217653@bcs.local>

Ken Seehart writes:
| 
| Lacrima wrote:
| > I am new to python.
| > And now I am using trial version of Wing IDE.
| > But nobody mentioned it as a favourite editor.
| > So should I buy it when trial is expired or there are better choices?
| >   
| 

| I've heard notepad is pretty good.  http://www.notepad.org/
| 
| :-) Ken
| 

Seriously.  I actually know a programmer who does all of his work in
notepad: no macros, syntax-highlighting, or any other robust features,
plus that horrible font.

I use emacs.  No alternative presentation rivals, for me, the ability
to program your editor while you use it.  Never having to reach for
the mouse in emacs is a terrific (and optional) bonus.

I guess it depends on how you work.  If you're willing to invest a
fair amount of time in your editor and you like the idea of being able
to drastically modify your editor while you use it, you should
consider emacs.  Emacs has a good on-line help system, including a
friendly emacs lisp introduction.  If you're using a Mac, check out
Aquamacs Emacs.

I can't say a thing about other editors, except that when some shell
script perversely dumped me into vi a month ago, I felt as horrified
as if some actually living bugs had crawled out of my own reflection
on the computer screen and fallen, clicking and scraping, onto the
keyboard.  That's a personal reaction - totally irrelevant, of course.

Bar 



From robert.kern at gmail.com  Tue May 26 11:55:41 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 26 May 2009 10:55:41 -0500
Subject: large array in a single line
In-Reply-To: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
References: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
Message-ID: <gvh3dt$due$1@ger.gmane.org>

On 2009-05-26 09:18, karthik167 at gmail.com wrote:
> I would like to have a txt file of single line with
> [1 2 3 .........100]
>
> I try something like
> q=arange(100)
> fl=file('tmp.ext','w')
> fl.writelines(str(q))
> fl.close()
>
> Unfortunately my output is
>
> [ 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22
> 23 24
>   25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
> 48 49
>   50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
> 73 74
>   75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
> 98 99]
>
> ie there is automatic split in line after 76 characters. How do I
> avoid it? Thanks.

You will want to ask numpy questions on the numpy mailing list:

   http://www.scipy.org/Mailing_Lists

You can control the options for printing numpy arrays via the 
numpy.set_printoptions() function.

 
http://docs.scipy.org/doc/numpy/reference/generated/numpy.set_printoptions.html#numpy.set_printoptions

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From arnodel at googlemail.com  Tue May 26 12:10:02 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 26 May 2009 17:10:02 +0100
Subject: large array in a single line
References: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
	<m28wkk2b5n.fsf@googlemail.com>
	<a6a9f1a9-e9a0-488e-b5c1-f5a1af0a3e73@b7g2000pre.googlegroups.com>
Message-ID: <m24ov73kx1.fsf@googlemail.com>

karthik167 at gmail.com writes:

> On May 26, 7:26?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
>> karthik... at gmail.com writes:
>> > I would like to have a txt file of single line with
>> > [1 2 3 .........100]
>>
>> > I try something like
>> > q=arange(100)
>> > fl=file('tmp.ext','w')
>> > fl.writelines(str(q))
>> > fl.close()
>>
>> > Unfortunately my output is
>>
>> > [ 0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9 10 11 12 13 14 15 16 17 18 19 20 21 22
>> > 23 24
>> > ?25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
>> > 48 49
>> > ?50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
>> > 73 74
>> > ?75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
>> > 98 99]
>>
>> > ie there is automatic split in line after 76 characters. How do I
>> > avoid it? Thanks.
>>
>> You need to tell us more about the arange() function you use and what
>> object it returns.
>>
>> --
>> Arnaud
>
> arange(start, stop=None, step=1, typecode=None)
>
>      Just like range() except it returns an array whose type can be
>     specified by the keyword argument typecode.

You didn't mention that it is a numpy function!  It returns a
numpy.ndarray object whose __str__() method automatically inserts
newlines to make the output easier to read I guess.

Don't use this, then. You can do for instance:

fl = open('tmp.ext', 'w')
fl.writelines(['[', ' '.join(range(1, 101)), ']'])
fl.close()

(untested)

-- 
Arnaud



From python.list at tim.thechases.com  Tue May 26 12:12:54 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 26 May 2009 11:12:54 -0500
Subject: What text editor is everyone using for Python
In-Reply-To: <1a4efed3-e308-4f11-95c2-8209fd186ab0@c7g2000prc.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<1a4efed3-e308-4f11-95c2-8209fd186ab0@c7g2000prc.googlegroups.com>
Message-ID: <4A1C1506.5060805@tim.thechases.com>

Zamnedix wrote:
>> So what do you guys use, and why? Hopefully we can keep this civil.
> 
> Nano! Nano! Nano Revolution!!!

Thank you, Mork[1] :)

-tkc (who uses Vim for Python coding, and on rare occasions, 
Notepad or ed)

[1]
http://en.wikipedia.org/wiki/Mork_%26_Mindy







From nad at acm.org  Tue May 26 12:38:05 2009
From: nad at acm.org (Ned Deily)
Date: Tue, 26 May 2009 09:38:05 -0700
Subject: How to test python snippets in my documents?
References: <ZjTSl.34029$ZP4.2476@nlpi067.nbdc.sbc.com>
Message-ID: <nad-2B677E.09380526052009@news.gmane.org>

In article <ZjTSl.34029$ZP4.2476 at nlpi067.nbdc.sbc.com>,
 Matthew Wilson <matt at tplus1.com> wrote:
> I'm using a homemade script to verify some code samples in my
> documentation.  [...]
> The script checks all the files listed as arguments.  This is OK, but is
> there anything better?

Perhaps a test-discovery framework, like nose:

http://ivory.idyll.org/articles/nose-intro.html#running-doctests-in-nose

-- 
 Ned Deily,
 nad at acm.org



From mal at egenix.com  Tue May 26 12:42:37 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Tue, 26 May 2009 18:42:37 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A1B9367.7090808@v.loewis.de>
References: <4A107988.3020202@v.loewis.de> <4A1AD862.6090100@egenix.com>
	<4A1B9367.7090808@v.loewis.de>
Message-ID: <4A1C1BFD.8090700@egenix.com>

Martin v. L?wis wrote:
>> Now, with the PEP, I have a feeling that the Python C-API
>> will in effect be limited to what's in the PEP's idea of
>> a usable ABI and open up the non-inluded public C-APIs
>> to the same rate of change as the private APIs.
> 
> That's certainly not the plan. Instead, the plan is to have
> a stable ABI. The policy on the API isn't affected, except
> for restricting changes to the API that would break the ABI.

Thanks for clarifying this.

>>> During the compilation of applications, the preprocessor macro
>>> Py_LIMITED_API must be defined. Doing so will hide all definitions
>>> that are not part of the ABI.
>> So extensions wanting to use the full Python C-API as documented
>> in the C-API docs will still be able to do this, right ?
> 
> Correct. They would link to the version-specific DLL on Windows.

Good.

>>> The structure of type objects is not available to applications;
>>> declaration of "static" type objects is not possible anymore
>>> (for applications using this ABI).
>> Hmm, that's going to create big problems for extensions that
>> want to expose a C-API for their types: Type checks are normally
>> done by pointer comparison using those static type objects.
> 
> I don't see the problem. During module initialization, you
> create the type object and store it in a global variable, and
> then both clients and the module compare against the stored
> pointer.

Ah, good point !

>>> Function-like macros (in particular, field access macros) remain
>>> available to applications, but get replaced by function calls
>>> (unless their definition only refers to features of the ABI, such
>>> as the various _Check macros)
>> Including Py_INCREF()/Py_DECREF() ?
> 
> Yes, although some people are requesting that these become functions.

I'd opt against that, simply because it creates a lot of overhead
due to the function call and issues with cache locality.

>>> Excluded Functions
>>> ------------------
>>>
>>> Functions declared in the following header files are not part
>>> of the ABI:
>>> - cellobject.h
>>> - classobject.h
>>> - code.h
>>> - frameobject.h
>>> - funcobject.h
>>> - genobject.h
>>> - pyarena.h
>>> - pydebug.h
>>> - symtable.h
>>> - token.h
>>> - traceback.h
>> I don't think that's feasable: you basically remove all introspection
>> functions that way.
>>
>> This will need a more fine-grained approach.
> 
> What specifically is it that you want to do in a module that you
> couldn't do anymore?

See my reply to Nick: some of the functions are needed even
if you don't want to do introspection, such as Py_FatalError()
or PyTraceBack_Print().

BTW: Given the headline, I take it that the various type checking
macros in these header will still be available, right ?

>>> On Windows, applications shall link with python3.dll;
>> You mean: extensions that were compiled with Py_LIMITED_API, right ?
> 
> Correct, see "Terminology" in the PEP.

Good, thanks.

>>> an import
>>> library python3.lib will be available. This DLL will redirect all of
>>> its API functions through /export linker options to the full
>>> interpreter DLL, i.e. python3y.dll.
>> What if you mix extensions that use the full C-API with ones
>> that restrict themselves to the limited version ?
> 
> Some link against python3.dll, others against python32.dll (say).
> 
>> Would creating a Python object in a full-API extension and
>> free'ing it in a limited-API extension cause problems ?
> 
> No problem that I can see.

Can we be sure that the MSVCRT used by python35.dll stays compatible
to the one used by say python32.dll ? What if the CRT memory
management changes between MSVCRT versions ?

Another aspect to consider:

How will this work in the light of having multiple copies of
Python installed on a Windows machine ?

They implementation section suggests that python3.dll would always
redirect to the python3x.dll for which it was installed, ie. if
I have Python 3.5 installed, but then need to run some app with
Python 3.2, the installed python3.dll would then point back to the
python32.dll.

Now, if I start a Python 3.5 application which uses a limited
API extension, this would try to load python32.dll into the
Python 3.5 process. AFAIK, that's not possible due to the
naming conflicts.

>>> This PEP will be implemented in a branch, allowing users to check
>>> whether their modules conform to the ABI. To simplify this testing, an
>>> additional macro Py_LIMITED_API_WITH_TYPES will expose the existing
>>> type object layout, to let users postpone rewriting all types. When
>>> the this branch is merged into the 3.2 code base, this macro will
>>> be removed.
>> Now I'm confused again: this sounds a lot like you do want all extension
>> writers to only use the limited API.
> 
> I certainly want to support as many modules as reasonable with the PEP.
> Whether or not developers then chose to build version-independent
> binaries is certainly outside the scope of the PEP - it only specifies
> action items for Python, not for application authors.

Thanks for the clarification.

>>>> Something I haven't seen explicitly mentioned as yet (in the PEP or the
>>>>> python-dev list discussion) are the memory management APIs and the FILE*
>>>>> APIs which can cause the MSVCRT versioning issues on Windows.
>>>>>
>>>>> Those would either need to be excluded from the stable ABI or else
>>>>> changed to use opaque pointers.
>>> Good point. As a separate issue, I would actually like to deprecate,
>>> then remove these APIs. I had originally hoped that this would happen
>>> for 3.0 already, alas, nobody worked on it.
>>>
>>> In any case, I have removed them from the ABI now.
>> How do you expect Python extensions to allocate memory and objects
>> in a platform independent way without those APIs ?
> 
> I have only removed functions from the ABI that have FILE* in their
> signatures.
> 
>> And as an aside: Which API families are you referring to ? PyMem_Malloc,
>> PyObject_Malloc, or PyObject_New ?
> 
> Neither. PyRun_AnyFileFlags and friends.

Good.

Thanks,
-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, May 26 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________
2009-06-29: EuroPython 2009, Birmingham, UK                33 days to go

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From joel.goldstick at columbuswebmakers.com  Tue May 26 12:50:36 2009
From: joel.goldstick at columbuswebmakers.com (Joel Goldstick)
Date: Tue, 26 May 2009 12:50:36 -0400
Subject: test message
Message-ID: <4A1C1DDC.6090101@columbuswebmakers.com>

I'm wondering why I couldn't post here.  I read the email list, not from 
  the newsgroup


From bblais at bryant.edu  Tue May 26 13:12:09 2009
From: bblais at bryant.edu (Brian Blais)
Date: Tue, 26 May 2009 13:12:09 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1C0806.2090802@seehart.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com> <4A1C0806.2090802@seehart.com>
Message-ID: <9F6A6533-D344-439F-806F-5285F4ACCB7E@bryant.edu>

On May 26, 2009, at 11:17 , Ken Seehart wrote:

>
> Lacrima wrote:
>> I am new to python.
>> And now I am using trial version of Wing IDE.
>> But nobody mentioned it as a favourite editor.
>> So should I buy it when trial is expired or there are better choices?
>>
>
> Jean-Michel Pichavant wrote:
>> Why buy an IDE when you just need a text editor ? I don't get it.
>> Anyway gvim (aka vim aka vi) and emacs are the most powerful  
>> editors for years. Both have Windows and Linux version and most  
>> important, they both are very effective at editing any file type  
>> (python, C, latex, love letters...)
>> Emacs is more accessible to the newby but requires time to master  
>> its complex features.
>> Gvim may be complex for the newby due to its command/insertion  
>> mode constant switch, but is as powerful as emacs can be. Being a  
>> gvim adept, I should stat that gvim is far better but it would  
>> only feed the neverending war.
>>
>> Jean-Michel
>>
> I've heard notepad is pretty good.  http://www.notepad.org/
>


I'm sorry, but ed is the standard editor[1].   :)


				bb



[1] http://en.wikipedia.org/wiki/Ed_(text_editor)
>

-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais



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From stugots at qwest.net  Tue May 26 13:12:23 2009
From: stugots at qwest.net (John DeRosa)
Date: Tue, 26 May 2009 10:12:23 -0700
Subject: Ted Dziuba
References: <gvdgut$i3k$1@lust.ihug.co.nz>
Message-ID: <2009052610122375249-stugots@qwestnet>

On 2009-05-25 00:22:04 -0700, Lawrence D'Oliveiro 
<ldo at geek-central.gen.new_zealand> said:

> <http://www.theregister.co.uk/2009/05/25/dziuba_microsoft_php/page2.html>:
> 
>     If you've ever had to build C extensions to Python on Windows, you can
>     join me in a feeling of satisfaction that someone at Microsoft is going
>     to have to figure this out. Let's call it retribution for Internet
>     Explorer 6.

Brilliant. OT, I miss uncov.com. His wit is razor-sharp.



From bblais at bryant.edu  Tue May 26 13:16:30 2009
From: bblais at bryant.edu (Brian Blais)
Date: Tue, 26 May 2009 13:16:30 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <B1FD356B-5611-44DF-8A1F-77712D89B825@bryant.edu>

On May 26, 2009, at 8:07 , Lacrima wrote:

> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

I have found that the appreciation of a text editor varies greatly  
across different people.  What one person swears by, feels clunky to  
another.  On the Mac, I like TextMate because I find it pretty clean  
and fast.  On Windows I've used Notepad++, Emacs, Crimson, and  
possibly a few others.  What I recommend is to try out some of the  
editors in:

http://wiki.python.org/moin/PythonEditors

and see how it works for you.  Depending on what you need, and how  
they "feel", you may find what you want with a free editor.



					bb

-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais



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From randall at tnr.cc  Tue May 26 13:52:22 2009
From: randall at tnr.cc (Randall Smith)
Date: Tue, 26 May 2009 12:52:22 -0500
Subject: multiprocessing / forking memory usage
Message-ID: <gvha8n$7n6$1@ger.gmane.org>

I'm trying to get a grasp on how memory usage is affected when forking 
as the multiprocessing module does.  I've got a program with a parent 
process using wx and other memory intensive modules. It spawns child 
processes (by forking) that should be very lean (no wx required, etc). 
Based on inspection using "ps v" and psutil, the memory usage (rss) is 
much higher than I would expect for the subprocess.

My understanding is that COW is used when forking (on Linux).  So maybe 
"ps v pid" is reflecting that.  If that's the case, is there a way to 
better determine the child's memory usage?  If it's not the case and I'm 
using modules I don't need, how can I reduce the memory usage to what 
the child actually uses instead of including everything the parent is using?

Randall



From icymist at gmail.com  Tue May 26 14:12:00 2009
From: icymist at gmail.com (lone_eagle)
Date: Tue, 26 May 2009 11:12:00 -0700 (PDT)
Subject: Passing string from python programs to external programs
Message-ID: <47463f42-448e-472a-98ad-bced4b278050@g19g2000yql.googlegroups.com>

Hi all,

On Linux, I do something like this

$ program_to_execute < input_file
... get some output ...

I have the content of the input_file as a string inside a python
program and would like to pass this string to the external program
from inside the python program and get back the programs output in a
string/file. Can someone tell me how to achieve this. I have been
through the documentation for Popen, but this one beats me.

Cheers,
Chaitanya


From smukh at cognobytes.com  Tue May 26 14:39:36 2009
From: smukh at cognobytes.com (Sumitava Mukherjee)
Date: Tue, 26 May 2009 11:39:36 -0700 (PDT)
Subject: How do I sample randomly based on some probability(wightage)?
Message-ID: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>

Hi all,
I need to randomly sample from a list where all choices have weights
attached to them. The probability of them being choosen is dependent
on the weights.
If say Sample list of choices are [A,B,C,D,E] and weights of the same
are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
want the likeliness of them being chosen be in the order : D>A>C>E>B

In short I mean if prob of a H is .9 and probability of T be 0.1 then
if I draw 10 samples, 9 should be H and 1 should be T.

I coudn't find a function in the module random that does so.
Please can someone guide me how the above could be implemented [either
through some function which exists and I don't know or pointers to
some code snippets which does so]?


From smukh at cognobytes.com  Tue May 26 14:42:56 2009
From: smukh at cognobytes.com (Sumitava Mukherjee)
Date: Tue, 26 May 2009 11:42:56 -0700 (PDT)
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <c9566044-6e50-42ca-aa02-9ff63206c601@g22g2000pra.googlegroups.com>

On May 26, 11:39?pm, Sumitava Mukherjee <sm... at cognobytes.com> wrote:
> Hi all,
> I need to randomly sample from a list where all choices have weights
> attached to them. The probability of them being choosen is dependent
> on the weights.
> If say Sample list of choices are [A,B,C,D,E] and weights of the same
> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
> want the likeliness of them being chosen be in the order : D>A>C>E>B
>
> In short I mean if prob of a H is .9 and probability of T be 0.1 then
> if I draw 10 samples, 9 should be H and 1 should be T.
>
> I coudn't find a function in the module random that does so.
> Please can someone guide me how the above could be implemented [either
> through some function which exists and I don't know or pointers to
> some code snippets which does so]?

>>>> [Oh, I forgot to mention. I am looking for sampling without replacement.]


From emile at fenx.com  Tue May 26 14:49:43 2009
From: emile at fenx.com (Emile van Sebille)
Date: Tue, 26 May 2009 11:49:43 -0700
Subject: How do I sample randomly based on some probability(wightage)?
In-Reply-To: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <gvhdo4$j0p$1@ger.gmane.org>

On 5/26/2009 11:39 AM Sumitava Mukherjee said...
> Hi all,
> I need to randomly sample from a list where all choices have weights
> attached to them. The probability of them being choosen is dependent
> on the weights.
> If say Sample list of choices are [A,B,C,D,E] and weights of the same
> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
> want the likeliness of them being chosen be in the order : D>A>C>E>B
> 
> In short I mean if prob of a H is .9 and probability of T be 0.1 then
> if I draw 10 samples, 9 should be H and 1 should be T.

I don't know if there's a function for this somewhere, but you can 
easily roll your own...

import random

choices = list('ABCDE')
weights = [0.895,0.567,0.765,0.890,0.60]

selections = list("".join([ choice*int(weight*1000) for choice,weight in 
zip(choices,weights) ]))

random.shuffle(selections)

for randomchoice in selections:
    dosomething(randomchoice)

Emile



> 
> I coudn't find a function in the module random that does so.
> Please can someone guide me how the above could be implemented [either
> through some function which exists and I don't know or pointers to
> some code snippets which does so]?



From martin at v.loewis.de  Tue May 26 14:54:35 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 26 May 2009 20:54:35 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A1C1BFD.8090700@egenix.com>
References: <4A107988.3020202@v.loewis.de> <4A1AD862.6090100@egenix.com>
	<4A1B9367.7090808@v.loewis.de> <4A1C1BFD.8090700@egenix.com>
Message-ID: <4A1C3AEB.7010708@v.loewis.de>

>>>> Functions declared in the following header files are not part
>>>> of the ABI:
>>>> - cellobject.h
>>>> - classobject.h
>>>> - code.h
>>>> - frameobject.h
>>>> - funcobject.h
>>>> - genobject.h
>>>> - pyarena.h
>>>> - pydebug.h
>>>> - symtable.h
>>>> - token.h
>>>> - traceback.h
>>> I don't think that's feasable: you basically remove all introspection
>>> functions that way.
>>>
>>> This will need a more fine-grained approach.
>> What specifically is it that you want to do in a module that you
>> couldn't do anymore?
> 
> See my reply to Nick: some of the functions are needed even
> if you don't want to do introspection, such as Py_FatalError()

Ok. I don't know what Py_FatalError is doing in pydebug.h, so I
now propose to move it to pyerrors.h.

> or PyTraceBack_Print().

Ok; I have removed traceback.h from the list. By the other rules
of the PEP, the only function that becomes available then is
PyTraceBack_Print.

> BTW: Given the headline, I take it that the various type checking
> macros in these header will still be available, right ?

Which headers? The one on the list above? No; my idea would
be to completely hide them as-is.

All other type-checking macros will remain available, and
will remain being macros.

>>> Would creating a Python object in a full-API extension and
>>> free'ing it in a limited-API extension cause problems ?
>> No problem that I can see.
> 
> Can we be sure that the MSVCRT used by python35.dll stays compatible
> to the one used by say python32.dll ? What if the CRT memory
> management changes between MSVCRT versions ?

It doesn't matter. For Python "things", the extension module will
use the pymem.h functions, which get routed through pythonxy.dll
to the CRT that Python was build with.

If the extension uses regular malloc(), it should also invoke
regular free() on the pointer. There is no API where Python
calls malloc directly and the extension calls free, or vice
versa.

> How will this work in the light of having multiple copies of
> Python installed on a Windows machine ?

Interesting question. One solution could be to use SxS, which
would allow multiple concurrent installations of python3.dll,
although we would need to make sure it always binds to the
"right" one in each context.

Another solution could be to keep the various copies of python3.dll
in their respective PYTHONHOMEs, and leave it to python.exe or the
app to load the right one; any subsequent extension modules should
then pick up the one that was already loaded.

> They implementation section suggests that python3.dll would always
> redirect to the python3x.dll for which it was installed, ie. if
> I have Python 3.5 installed, but then need to run some app with
> Python 3.2, the installed python3.dll would then point back to the
> python32.dll.

That depends on where they get installed. If they all go into system32,
only the most recent one would be available, which is probably not
desirable.

> Now, if I start a Python 3.5 application which uses a limited
> API extension, this would try to load python32.dll into the
> Python 3.5 process. AFAIK, that's not possible due to the
> naming conflicts.

I don't see this problem. As long as we manage to install multiple
versions of python3.dll on the system somehow, different processes
could certainly load different such DLLs, and the same extension
module would always use the right one.

Regards,
Martin


From arnodel at googlemail.com  Tue May 26 14:58:02 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 26 May 2009 19:58:02 +0100
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<c9566044-6e50-42ca-aa02-9ff63206c601@g22g2000pra.googlegroups.com>
Message-ID: <m2zlcz1ykl.fsf@googlemail.com>

Sumitava Mukherjee <smukh at cognobytes.com> writes:

> On May 26, 11:39?pm, Sumitava Mukherjee <sm... at cognobytes.com> wrote:
>> Hi all,
>> I need to randomly sample from a list where all choices have weights
>> attached to them. The probability of them being choosen is dependent
>> on the weights.
>> If say Sample list of choices are [A,B,C,D,E] and weights of the same
>> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
>> want the likeliness of them being chosen be in the order : D>A>C>E>B

You mean A > D > C > E > B

>> In short I mean if prob of a H is .9 and probability of T be 0.1 then
>> if I draw 10 samples, 9 should be H and 1 should be T.
>>
>> I coudn't find a function in the module random that does so.
>> Please can someone guide me how the above could be implemented [either
>> through some function which exists and I don't know or pointers to
>> some code snippets which does so]?
>
>>>>> [Oh, I forgot to mention. I am looking for sampling without replacement.]

If you do sampling without replacement, you need to know the exact
number of each of A, B, C, D, E in the sample, not just their relative
frequency.

-- 
Arnaud


From debatem1 at gmail.com  Tue May 26 15:09:10 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 26 May 2009 12:09:10 -0700 (PDT)
Subject: Passing string from python programs to external programs
References: <47463f42-448e-472a-98ad-bced4b278050@g19g2000yql.googlegroups.com>
Message-ID: <dbcd3a93-82c2-4282-9775-0b901a0fc124@s21g2000vbb.googlegroups.com>

On May 26, 2:12?pm, lone_eagle <icym... at gmail.com> wrote:
> Hi all,
>
> On Linux, I do something like this
>
> $ program_to_execute < input_file
> ... get some output ...
>
> I have the content of the input_file as a string inside a python
> program and would like to pass this string to the external program
> from inside the python program and get back the programs output in a
> string/file. Can someone tell me how to achieve this. I have been
> through the documentation for Popen, but this one beats me.
>
> Cheers,
> Chaitanya

from subprocess import getstatusoutput

cmd = 'echo '
str = 'Hello World!'
status, output = getstatusoutput(cmd + repr(str))

Obviously, this is 3.x. I believe that in 2.x it was in
the commands module.

Geremy Condra


From jeff at jmcneil.net  Tue May 26 15:16:27 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Tue, 26 May 2009 12:16:27 -0700 (PDT)
Subject: Passing string from python programs to external programs
References: <47463f42-448e-472a-98ad-bced4b278050@g19g2000yql.googlegroups.com>
Message-ID: <6853b163-782c-44d0-a4dc-d8d906fe95f1@l28g2000vba.googlegroups.com>

On May 26, 2:12?pm, lone_eagle <icym... at gmail.com> wrote:
> Hi all,
>
> On Linux, I do something like this
>
> $ program_to_execute < input_file
> ... get some output ...
>
> I have the content of the input_file as a string inside a python
> program and would like to pass this string to the external program
> from inside the python program and get back the programs output in a
> string/file. Can someone tell me how to achieve this. I have been
> through the documentation for Popen, but this one beats me.
>
> Cheers,
> Chaitanya

Sounds like subprocess is what you want.  Here's a quick ad-hoc
example. You can find more information on the module at
http://docs.python.org/library/subprocess.html.

[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import subprocess
>>> sub = subprocess.Popen('/bin/gzip', stdin=subprocess.PIPE, stdout=subprocess.PIPE)
>>> g = sub.communicate('Please, sir, gzip me?')
>>> import gzip
>>> import StringIO
>>> gzip.GzipFile(fileobj=StringIO.StringIO(g[0])).read()
'Please, sir, gzip me?'
>>>

Thanks,

Jeff
mcjeff.blogspot.com


From joshua at joshuakugler.com  Tue May 26 15:19:18 2009
From: joshua at joshuakugler.com (Joshua Kugler)
Date: Tue, 26 May 2009 11:19:18 -0800
Subject: Compile python extensions under windows/cygwin
References: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
Message-ID: <gvhfbn$nn9$1@ger.gmane.org>

Joana wrote:

> I mantain Python on Windows, all installed packages are under c:
> \Python25\Lib\site-packages. Now I have to build C libraries used by
> python extensions and I am using cygwin, but I don't know how to
> install the module in Windows directory.

I have used MingW to do this.  Might this help:

http://joshuakugler.com/archives/13-Building-Python-Eggs-with-C-Extensions-on-Windows.html

j



From mwilson at the-wire.com  Tue May 26 15:23:00 2009
From: mwilson at the-wire.com (Mel)
Date: Tue, 26 May 2009 15:23 -0400
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <gvhfie$1mpk$1@services.telesweet.net>

Sumitava Mukherjee wrote:

> Hi all,
> I need to randomly sample from a list where all choices have weights
> attached to them. The probability of them being choosen is dependent
> on the weights.
> If say Sample list of choices are [A,B,C,D,E] and weights of the same
> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
> want the likeliness of them being chosen be in the order : D>A>C>E>B
> 
> In short I mean if prob of a H is .9 and probability of T be 0.1 then
> if I draw 10 samples, 9 should be H and 1 should be T.
> 
> I coudn't find a function in the module random that does so.
> Please can someone guide me how the above could be implemented [either
> through some function which exists and I don't know or pointers to
> some code snippets which does so]?

 I've usually used something like (untested):

def chooser (objects, weights):
    total = 0.0
    for obj, weight in zip (objects, weights):
        total += weight
        if weight < total * random.random():
            chosen = obj
    return chosen

Works fine if runtime is not a great concern.

        Mel.



From george.sakkis at gmail.com  Tue May 26 15:23:10 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Tue, 26 May 2009 12:23:10 -0700 (PDT)
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <1002ca53-6d60-4c0c-a0d5-54a178a4ebd5@d25g2000prn.googlegroups.com>

On May 26, 2:39?pm, Sumitava Mukherjee <sm... at cognobytes.com> wrote:
> Hi all,
> I need to randomly sample from a list where all choices have weights
> attached to them. The probability of them being choosen is dependent
> on the weights.
> If say Sample list of choices are [A,B,C,D,E] and weights of the same
> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
> want the likeliness of them being chosen be in the order : D>A>C>E>B
>
> In short I mean if prob of a H is .9 and probability of T be 0.1 then
> if I draw 10 samples, 9 should be H and 1 should be T.
>
> I coudn't find a function in the module random that does so.
> Please can someone guide me how the above could be implemented [either
> through some function which exists and I don't know or pointers to
> some code snippets which does so]?

1. Normalize the weights so that they sum up to 1.
2. Form the cumulative sequence S = [0, w0, w0+w1, w0+w1+w2, ..., sum
(w)==1.0]
3. Call random.random() -> x
4. Find the bucket in S that x belongs to, i.e. the i so that s[i] <=
x < s[i+1] (you can do this fast using the bisect module).
5. Return choice[i]
6. Test.
7. Submit homework ;)

HTH,
George


From boris.kazakov at gmail.com  Tue May 26 15:24:42 2009
From: boris.kazakov at gmail.com (=?KOI8-R?B?4s/SydMg68HawcvP1w==?=)
Date: Tue, 26 May 2009 23:24:42 +0400
Subject: Pickle of the instance of new style class fails when execute with 
	exec statement
Message-ID: <681c4a70905261224g6c39c3c0jfa733ab5aaa30e9f@mail.gmail.com>

Hi, I'm trying to execute the following code:

d = {}
exec('import cPickle')  in d
desc = """
class A(object):
    pass
"""
exec(desc) in d

exec('a = A()') in d
exec('cPickle.dump(a, open("tmp.txt","wb"))')in d

for some reason it fails with the following traceback:

Traceback (most recent call last):
  File "pickleTest.py", line 10, in <module>
    exec('cPickle.dump(a, open("tmp.txt","wb"))')in d
  File "<string>", line 1, in <module>
cPickle.PicklingError: Can't pickle <class 'A'>: attribute lookup
__builtin__.A failed

pickle also dosen't work, changing protocol dosen't seem to help.

it works when i do:

exec('import __builtin__') in d
exec('__builtin__.A = A') in d

but it pollutes builtin namespace, which I don't like.

May be there is a workaround, how to do this correctly?
Thanks in advance,
Boris.
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From msolem at linuxmail.org  Tue May 26 15:25:22 2009
From: msolem at linuxmail.org (msolem at linuxmail.org)
Date: Tue, 26 May 2009 12:25:22 -0700 (PDT)
Subject: unpickling a stream
Message-ID: <3efc7aa5-c9b7-4755-bd5f-a4e87518d423@x5g2000yqk.googlegroups.com>

Hello,

I want to send a stream of pickled objects over a socket.  Is there a
standard way of ensuring that only complete objects are unpickled on
the receiving side.

client pseudo code:
  loop forever:
    receive some bytes on the socket
    if we have received a complete pickled object:  <== How is this
done?
      unpickle the object

This isn't for a project, just trying to learn some more about the
pickle module.

Mike


From bearophileHUGS at lycos.com  Tue May 26 15:25:29 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 26 May 2009 12:25:29 -0700 (PDT)
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <defe8aa2-921d-4567-80b4-a13089486c2c@r37g2000yqd.googlegroups.com>

Sumitava Mukherjee:
>I need to randomly sample from a list where all choices have weights attached to them.<

Like this?
http://code.activestate.com/recipes/498229/

Bye,
bearophile


From davea at ieee.org  Tue May 26 16:41:35 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 26 May 2009 16:41:35 -0400
Subject: How do I sample randomly based on some probability(wightage)?
In-Reply-To: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <4A1C53FF.80203@ieee.org>

Sumitava Mukherjee wrote:
> Hi all,
> I need to randomly sample from a list where all choices have weights
> attached to them. The probability of them being choosen is dependent
> on the weights.
> If say Sample list of choices are [A,B,C,D,E] and weights of the same
> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
> want the likeliness of them being chosen be in the order : D>A>C>E>B
>
> In short I mean if prob of a H is .9 and probability of T be 0.1 then
> if I draw 10 samples, 9 should be H and 1 should be T.
>
> I coudn't find a function in the module random that does so.
> Please can someone guide me how the above could be implemented [either
> through some function which exists and I don't know or pointers to
> some code snippets which does so]?
>
>   
Emile gave you a pretty elegant solution, assuming two things:  The 
choices can be represented by a single character each, and a roundoff 
error of one part in a thousand is acceptable.

Of course, you can represent 256 choices in a 2.x character, and you 
could switch to Unicode if that's not enough.  And if 1000 isn't enough, 
you could make it bigger, at the cost of needing a bigger table.

Here's my more-straightforward algorithm, not reduced to code.

Start with a list of probabilities.  Replace each item with the sum of 
all the items up to and including itself.  (If you do it in-place, you'd 
need to do it in reverse order, but if you use a copy, you could simply 
replace each item with a sum() of the appropriate slice of the copy.


Anyway, now you've got a list of cumulative probabilites, with the last 
item equalling 1.0 (pretty close).  You might need to fudge that to 
exactly 1.0, just in case.

I think I'd zip that list with the original list of items, so that you 
have a single list of tuples.

Now to generate a random sample, call  random.random() to get a value 
between 0 and 1. Search the list for the first item greater than or 
equal to your value, and return the other half of the tuple.




From rNOSPAMon at flownet.com  Tue May 26 17:10:05 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Tue, 26 May 2009 14:10:05 -0700
Subject: distutils extension configuration problem
Message-ID: <rNOSPAMon-6DE857.14100426052009@news.gha.chartermi.net>

I'm trying to build PyObjC on an Intel Mac running OS X 10.5.7.  The 
build is breaking because distutils seems to want to build extension 
modules as universal binaries, but some of the libraries it depends on 
are built for intel-only, i.e.:

[ron at mickey:~/Desktop/pyobjc-framework-ScreenSaver-2.2b2]$ python2.6 
setup.py build
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/distutils
/dist.py:266: UserWarning: Unknown distribution option: 'options'
  warnings.warn(msg)
running build
running build_py
running build_ext
building 'ScreenSaver._inlines' extension
gcc -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -g 
-bundle -undefined dynamic_lookup 
build/temp.macosx-10.3-i386-2.6/Modules/_ScreenSaver_inlines.o -o 
build/lib.macosx-10.3-i386-2.6/ScreenSaver/_inlines.so -framework 
ScreenSaver
ld: in /Developer/SDKs/MacOSX10.4u.sdk/usr/local/lib/libTIFF.dylib, file 
is not of required architecture for architecture ppc
collect2: ld returned 1 exit status
lipo: can't open input file: 
/var/folders/nT/nTiypn-v2RatkU+BYncrKU+++TI/-Tmp-//ccMFYRkt.out (No such 
file or directory)
error: command 'gcc' failed with exit status 1

[ron at mickey:~/Desktop/pyobjc-framework-ScreenSaver-2.2b2]$ file 
build/temp.macosx-10.3-i386-2.6/Modules/_ScreenSaver_inlines.o 
build/temp.macosx-10.3-i386-2.6/Modules/_ScreenSaver_inlines.o: Mach-O 
universal binary with 2 architectures
build/temp.macosx-10.3-i386-2.6/Modules/_ScreenSaver_inlines.o (for 
architecture ppc): Mach-O object ppc
build/temp.macosx-10.3-i386-2.6/Modules/_ScreenSaver_inlines.o (for 
architecture i386):   Mach-O object i386

[ron at mickey:~/Desktop/pyobjc-framework-ScreenSaver-2.2b2]$ file 
/usr/local/lib/libtiff.dylib 
/usr/local/lib/libtiff.dylib: Mach-O dynamically linked shared library 
i386

How do I get distutils to stop trying to build extensions as universal 
binaries?

Thanks,
rg


From piet at cs.uu.nl  Tue May 26 17:14:37 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Tue, 26 May 2009 23:14:37 +0200
Subject: multiprocessing / forking memory usage
References: <mailman.771.1243360355.8015.python-list@python.org>
Message-ID: <m2octf5zya.fsf@cs.uu.nl>

>>>>> Randall Smith <randall at tnr.cc> (RS) wrote:

>RS> I'm trying to get a grasp on how memory usage is affected when forking as
>RS> the multiprocessing module does.  I've got a program with a parent process
>RS> using wx and other memory intensive modules. It spawns child processes (by
>RS> forking) that should be very lean (no wx required, etc). Based on
>RS> inspection using "ps v" and psutil, the memory usage (rss) is much higher
>RS> than I would expect for the subprocess.

The child is a clone of the parent. So both its virtual memory usage and
its resident memory usage will be equal to the parent's ones immediately
after the fork(). But the actual physical memory has only one copy
resident, although ps will show it on both processes (at least I think
that's how ps works). Of course later they will diverge.

>RS> My understanding is that COW is used when forking (on Linux).  

I think this is true of all modern Unix systems.

>RS> So maybe "ps v pid" is reflecting that. If that's the case, is
>RS> there a way to better determine the child's memory usage?
 
Define `memory usage' in the light of the above.

As long as the parent is still around and you don't run out of virtual
memory in the child, not much harm is done.

If the parent stops and you don't run out of virtual memory in the
child, the excessive pages will eventually be paged out, and then no
longer occupy physical memory. As long as you have enough swap space it
shouldn't be a big problem. The extra paging activity is a bit of a
loss, however.

If you run out of virtual memory in the child you have a problem, however.

>RS> If it's not the case and I'm using
>RS> modules I don't need, how can I reduce the memory usage to what the child
>RS> actually uses instead of including everything the parent is using?

The best would be to fork the child before you import the excess modules
in the parent. If that is not possible you could try to delete as much
in the child as you can, for example by
del wx; del sys.modules['wx'] etc, delete all variables that you don't
need, and hope the garbage collector will clean up enough. But it will
make you application quite complicated. From the python level you can't
get rid of loaded shared libraries, however. And trying to do that from
the C level is probably close to committing suicide.

My advise: don't worry until you really experience memory problems.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From icymist at gmail.com  Tue May 26 17:16:11 2009
From: icymist at gmail.com (psykeedelik)
Date: Tue, 26 May 2009 14:16:11 -0700 (PDT)
Subject: Passing string from python programs to external programs
References: <47463f42-448e-472a-98ad-bced4b278050@g19g2000yql.googlegroups.com>
	<6853b163-782c-44d0-a4dc-d8d906fe95f1@l28g2000vba.googlegroups.com>
Message-ID: <17053796-d6d3-473c-9652-bc404ead5ead@k2g2000yql.googlegroups.com>

On May 26, 9:16?pm, Jeff McNeil <j... at jmcneil.net> wrote:
> On May 26, 2:12?pm, lone_eagle <icym... at gmail.com> wrote:
>
> > Hi all,
>
> > On Linux, I do something like this
>
> > $ program_to_execute < input_file
> > ... get some output ...
>
> > I have the content of the input_file as a string inside a python
> > program and would like to pass this string to the external program
> > from inside the python program and get back the programs output in a
> > string/file. Can someone tell me how to achieve this. I have been
> > through the documentation for Popen, but this one beats me.
>
> > Cheers,
> > Chaitanya
>
> Sounds like subprocess is what you want. ?Here's a quick ad-hoc
> example. You can find more information on the module athttp://docs.python.org/library/subprocess.html.
>
> [GCC 4.3.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> import subprocess
> >>> sub = subprocess.Popen('/bin/gzip', stdin=subprocess.PIPE, stdout=subprocess.PIPE)
> >>> g = sub.communicate('Please, sir, gzip me?')
> >>> import gzip
> >>> import StringIO
> >>> gzip.GzipFile(fileobj=StringIO.StringIO(g[0])).read()
>
> 'Please, sir, gzip me?'
>
>
>
> Thanks,
>
> Jeff
> mcjeff.blogspot.com

Thanks guys!! Problem solved!!


From davea at ieee.org  Tue May 26 17:36:01 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 26 May 2009 17:36:01 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <B1FD356B-5611-44DF-8A1F-77712D89B825@bryant.edu>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<B1FD356B-5611-44DF-8A1F-77712D89B825@bryant.edu>
Message-ID: <4A1C60C1.70402@ieee.org>

Lacrima wrote:
>> I am new to python.
>> And now I am using trial version of Wing IDE.
>> But nobody mentioned it as a favourite editor.
>> So should I buy it when trial is expired or there are better choices?
>
I'm a little surprised nobody has explicitly mentioned Komodo IDE (the 
full version).  Although it's not free, it has plenty of useful 
features, is very configurable, supports Python and a host of other 
languages, and is a full IDE with an out-of-process debugger.  This 
means you can step through GUI code, without it interfering with the 
debugger's event loop.

You can customize it in four ways:
  1) through Edit->Preferences
  2) through recorded macros
  3) through macros written in Javascript
  4) through macros written in Python


A subset of Komodo IDE is available as Komodo Edit, which is open source.

Apparently Komodo is developed from some of the same code base as 
Firefox, so they can be integrated more tightly when debugging internet 
stuff.  I haven't tried anything of the sort, so
 I can't say how well this works, and for what.



From bjracine at glosten.com  Tue May 26 17:59:08 2009
From: bjracine at glosten.com (Benjamin J. Racine)
Date: Tue, 26 May 2009 14:59:08 -0700
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1C60C1.70402@ieee.org>
Message-ID: <B5B90D0DBF4EDC46892E8FD3602BA92A19C68946@clipper.glosten.local>

I use Textmate (with vim keybindings) on OS X or just vim on the others OS's.

I still can't decide on which IDE between Wing, PyDev and Netbeans.

Ben Racine



 

-----Original Message-----
From: python-list-bounces+bjracine=glosten.com at python.org [mailto:python-list-bounces+bjracine=glosten.com at python.org] On Behalf Of Dave Angel
Sent: Tuesday, May 26, 2009 2:36 PM
Cc: python-list at python.org; Lacrima
Subject: Re: What text editor is everyone using for Python

Lacrima wrote:
>> I am new to python.
>> And now I am using trial version of Wing IDE.
>> But nobody mentioned it as a favourite editor.
>> So should I buy it when trial is expired or there are better choices?
>
I'm a little surprised nobody has explicitly mentioned Komodo IDE (the full version).  Although it's not free, it has plenty of useful features, is very configurable, supports Python and a host of other languages, and is a full IDE with an out-of-process debugger.  This means you can step through GUI code, without it interfering with the debugger's event loop.

You can customize it in four ways:
  1) through Edit->Preferences
  2) through recorded macros
  3) through macros written in Javascript
  4) through macros written in Python


A subset of Komodo IDE is available as Komodo Edit, which is open source.

Apparently Komodo is developed from some of the same code base as Firefox, so they can be integrated more tightly when debugging internet stuff.  I haven't tried anything of the sort, so  I can't say how well this works, and for what.

--
http://mail.python.org/mailman/listinfo/python-list


From david at boddie.org.uk  Tue May 26 18:28:54 2009
From: david at boddie.org.uk (David Boddie)
Date: Wed, 27 May 2009 00:28:54 +0200
Subject: any lib to extract pages form pdf and then merge?
References: <mailman.735.1243313253.8015.python-list@python.org>
Message-ID: <gvhqf6$poq$1@get-news01.get.basefarm.net>

On Tuesday 26 May 2009 06:47, oyster wrote:

> I want to extract some pages from vary pdf files, then write them
> with/witout rotation into one new pdf file. something likes this

[...]

> I have tried pypdf, but it errs and exits on some of my pdfs(no, the
> files have no password)

Maybe you could get in touch with the author to try and work around these
problems.

David


From ldo at geek-central.gen.new_zealand  Tue May 26 19:33:51 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 11:33:51 +1200
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
	<gvb8kn$7gm$2@lust.ihug.co.nz>
	<mailman.674.1243192904.8015.python-list@python.org>
	<gvd6c0$bqs$1@lust.ihug.co.nz>
	<pan.2009.05.25.05.22.14@REMOVE.THIS.cybersource.com.au>
Message-ID: <gvhu8v$4ff$1@lust.ihug.co.nz>

In message <pan.2009.05.25.05.22.14 at REMOVE.THIS.cybersource.com.au>, Steven 
D'Aprano wrote:

> On Sun, 24 May 2009 22:47:51 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
> 
>> .. Gregory Chaitin among others has been trying to rework physics to get
>> rid of real numbers altogether.
> 
> (1/2) If you "get rid of real numbers", then obviously you must have a
> smaller set of numbers, not a larger.

Chaitin is trying to use only computable numbers. Pi is computable, as is e, 
sqrt(2), the Feigenbaum constant, and many others familiar to us all.

Trouble is, they only make up 0% of the reals. It's the other 100% he wants 
to get rid of.



From roy at panix.com  Tue May 26 19:51:54 2009
From: roy at panix.com (Roy Smith)
Date: Tue, 26 May 2009 19:51:54 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<gvgk6s$bpr$1@lust.ihug.co.nz> <m2d49w2cfn.fsf@googlemail.com>
Message-ID: <roy-AEB753.19515326052009@news.panix.com>

In article <m2d49w2cfn.fsf at googlemail.com>,
 Arnaud Delobelle <arnodel at googlemail.com> wrote:

> That's why I use ed.  Ed is the standard text editor [1].  Ed is open
> source [2].

I still use ed sometimes.  If I'm on a box which doesn't have emacs 
installed (or using something whose terminal emulation is totally broken), 
it lets me get work done.


From roy at panix.com  Tue May 26 19:58:51 2009
From: roy at panix.com (Roy Smith)
Date: Tue, 26 May 2009 19:58:51 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com> <4A1C0806.2090802@seehart.com>
	<mailman.764.1243352981.8015.python-list@python.org>
Message-ID: <roy-97FE62.19585126052009@news.panix.com>

In article <mailman.764.1243352981.8015.python-list at python.org>,
 Bar Shirtcliff <barshirtcliff at gmail.com> wrote:

> I can't say a thing about other editors, except that when some shell
> script perversely dumped me into vi a month ago, I felt as horrified
> as if some actually living bugs had crawled out of my own reflection
> on the computer screen and fallen, clicking and scraping, onto the
> keyboard.  That's a personal reaction - totally irrelevant, of course.

<esc> : q ! <return>

All the vi you ever need to know :-)

The real problem is when you get dumped into some editor other than you one 
you expected and don't realize it for a while.  It's really amazing how 
much damage you can do to a file by typing (for example) emacs commands at 
vi.  Especially if you accidentally stumble upon the sequence for "save 
file".


From rhodri at wildebst.demon.co.uk  Tue May 26 20:44:25 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 27 May 2009 01:44:25 +0100
Subject: What text editor is everyone using for Python
In-Reply-To: <roy-92C5E8.09222926052009@news.panix.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
Message-ID: <op.uukccbg3a8ncjz@gnudebst>

On Tue, 26 May 2009 14:22:29 +0100, Roy Smith <roy at panix.com> wrote:

> My pet peeve is syntax-aware editors which get things wrong.  For  
> example,
> the version of emacs I'm using now doesn't parse this properly:
>
> '''A triple-quoted string.  Some editors won't get this right'''
>
> The solution is to change the outer quotes to double-quotes, but it  
> annoys me when I have to change my code to appease a tool.

It's the separate python-mode that gets this (and much else) wrong.
The Python mode that Ubuntu packages with emacs 22.2.1 works just
fine.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From pavlovevidence at gmail.com  Tue May 26 21:26:17 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 26 May 2009 18:26:17 -0700 (PDT)
Subject: How to ask smart questions question
References: <gvgkiv$61t$1@aioe.org>
	<mailman.756.1243349312.8015.python-list@python.org>
Message-ID: <960af9f3-c445-4d6d-b277-76a123ee4dcd@s28g2000vbp.googlegroups.com>

On May 26, 7:48?am, Gary Herron <gher... at islandtraining.com> wrote:
> John wrote:
> > I'm okay with init, but it seems to me that enter is redundant since
> > it appears that anything you want to execute in enter can be done in
> > init.
>
> The proper response to a question like this has to be
> ? ?http://www.catb.org/~esr/faqs/smart-questions.html
> as anything else is complete guesswork.

Is there a Cliff's Notes version of this?

I may be a cynic but I would think the people who ask bad questions
are the same sort of people who won't have the patience to sit though
this behemoth of an essay.

And I may be a romantic but I would think most people who post this
are really trying to be helpful and not just saying, "Out of my midst,
vile newbie, until thou hearkenst unto the sacred words".

So, it would seem that a summary (with citations) of the essay would
be useful.


Carl Banks


From martin.hellwig at dcuktec.org  Tue May 26 21:54:36 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Wed, 27 May 2009 02:54:36 +0100
Subject: How to ask smart questions question
In-Reply-To: <960af9f3-c445-4d6d-b277-76a123ee4dcd@s28g2000vbp.googlegroups.com>
References: <gvgkiv$61t$1@aioe.org>
	<mailman.756.1243349312.8015.python-list@python.org>
	<960af9f3-c445-4d6d-b277-76a123ee4dcd@s28g2000vbp.googlegroups.com>
Message-ID: <Y-CdnfLqgsbBAIHXnZ2dnUVZ8judnZ2d@bt.com>

Carl Banks wrote:
> On May 26, 7:48 am, Gary Herron <gher... at islandtraining.com> wrote:
>> John wrote:
>>> I'm okay with init, but it seems to me that enter is redundant since
>>> it appears that anything you want to execute in enter can be done in
>>> init.
>> The proper response to a question like this has to be
>>    http://www.catb.org/~esr/faqs/smart-questions.html
>> as anything else is complete guesswork.
> 
> Is there a Cliff's Notes version of this?
> 
> I may be a cynic but I would think the people who ask bad questions
> are the same sort of people who won't have the patience to sit though
> this behemoth of an essay.
> 
> And I may be a romantic but I would think most people who post this
> are really trying to be helpful and not just saying, "Out of my midst,
> vile newbie, until thou hearkenst unto the sacred words".
> 
> So, it would seem that a summary (with citations) of the essay would
> be useful.
> 
> 
> Carl Banks

I can do a quick one albeit without citation:

- Have you googled/searched?
- No really, have you?
- Are you really, really sure?

- So what did you 'search for|tried before' which didn't returned a 
result you can work with?
- What does that tell you about yourself?
- So what do _you_ think _you_ should do first to solve _your_ problem?

- Okay, fair enough, tell me your problem, give me some background, give 
me some examples, skip the waffling, be polite I am here out of my own 
good will.

A: See you haven't searched properly | Hmm intriguing | Seems like a 
bug, contact the author

-- 
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'


From roy at panix.com  Tue May 26 21:57:49 2009
From: roy at panix.com (Roy Smith)
Date: Tue, 26 May 2009 21:57:49 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
Message-ID: <roy-0546BC.21574826052009@news.panix.com>

In article <mailman.782.1243385070.8015.python-list at python.org>,
 "Rhodri James" <rhodri at wildebst.demon.co.uk> wrote:

> On Tue, 26 May 2009 14:22:29 +0100, Roy Smith <roy at panix.com> wrote:
> 
> > My pet peeve is syntax-aware editors which get things wrong.  For  
> > example,
> > the version of emacs I'm using now doesn't parse this properly:
> >
> > '''A triple-quoted string.  Some editors won't get this right'''
> >
> > The solution is to change the outer quotes to double-quotes, but it  
> > annoys me when I have to change my code to appease a tool.
> 
> It's the separate python-mode that gets this (and much else) wrong.
> The Python mode that Ubuntu packages with emacs 22.2.1 works just
> fine.

Cool.  I'll see if I can snarf that and use it instead.


From martin.hellwig at dcuktec.org  Tue May 26 22:03:08 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Wed, 27 May 2009 03:03:08 +0100
Subject: How to ask smart questions question
In-Reply-To: <Y-CdnfLqgsbBAIHXnZ2dnUVZ8judnZ2d@bt.com>
References: <gvgkiv$61t$1@aioe.org>
	<mailman.756.1243349312.8015.python-list@python.org>
	<960af9f3-c445-4d6d-b277-76a123ee4dcd@s28g2000vbp.googlegroups.com>
	<Y-CdnfLqgsbBAIHXnZ2dnUVZ8judnZ2d@bt.com>
Message-ID: <2P-dnXP5FqPAAoHXnZ2dnUVZ8hGdnZ2d@bt.com>

Martin P. Hellwig wrote:
<cut see previous>
> I can do a quick one albeit without citation:
> 
> - Have you googled/searched?
> - No really, have you?
> - Are you really, really sure?
> 
> - So what did you 'search for|tried before' which didn't returned a 
> result you can work with?
> - What does that tell you about yourself?
> - So what do _you_ think _you_ should do first to solve _your_ problem?
> 
> - Okay, fair enough, tell me your problem, give me some background, give 
> me some examples, skip the waffling, be polite I am here out of my own 
> good will.
> 
> A: See you haven't searched properly | Hmm intriguing | Seems like a 
> bug, contact the author
> 

Oh I forgot:
- Be complete, don't forget essential things
- Write simple sentences, I don't want to guess the meaning of your epistle
- Use a spell checker
- It doesn't hurt to reread before hitting the send button

-- 
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'


From tiskanto at gmail.com  Tue May 26 22:46:21 2009
From: tiskanto at gmail.com (Teguh Iskanto)
Date: Wed, 27 May 2009 12:46:21 +1000
Subject: How does Python's OOP feel?
Message-ID: <e137e8260905261946q5666c240m516b28d841c9970@mail.gmail.com>

Ikon wrote:
>I'm rather new to Python. I have PHP for my main language and I do
>some Java. They all have a very strict OO schema. As I red through
>Python's tutorial it seams it has nothing of those rules. No statical,
>abstract classes, functions, or variables.
>
>I wish someone, who has experience in both Java/PHP/C# and Python
>would tell me how mush better/worse is it to program in a language
>that misses most of the OO parts!
>

Here's a view from a seasonal programmer :

My day job is mostly doing some networking/security stuffs,
I only do programmings only if I had to (like creating
tools/automation/etc) or if no one in my network team was able/didn't
want to do it :(
Just a couple months back we had an engineering issue and we needed to
create/design a robust broker system that works in a background.
This system would take orders from different systems in a form of XML
and should be able to 'talk' to cluster firewalls (range in hundreds
of firewalls) and should be able to add/remove/check/verify/edit
objects on the individual firewall.

Knowing the complexity of the problem and the time constraint that we
had (my manager gave me 2.5 months to get this thing to work) , I had
no other resolution other than turning my self into python. At first I
was a bit doubtful but I kept moving on esp knowing that running a big
and complex project with perl would be like 'digging my own graveyard'
(especially in terms of modularity & maintenance ).

As it turned out, I enjoyed doing big projects with python especially
with its OOP style : simple & really easy --without having to go into
too much OOP details or bogged down with OOP theory-- it just works !
and  it's as easy as if you're running a 'plug & play' module and
playing LEGO. Long story short, I was able to present the whole system
in time and the system is now being used in production for a mission
critical F/W deployment ( I've used pyexpect,XML and Threading to
speed up the process )

The good thing about python is : it 'tastes' like what it was being
advertised (eg: Makes things easy and makes complex problem possible )
and I agree 100% with that. If a seasonal programmer like me find it
easy, then it should be much easier for you.

BTW: Before this project, I've programmed in C/PHP/Perl/Tcl but never
had a chance to really try Python in a full-blown OOP complex project.
HTH


From yhtan at values1.com  Tue May 26 22:50:26 2009
From: yhtan at values1.com (Tan, Yih Hung)
Date: Wed, 27 May 2009 10:50:26 +0800
Subject: Question in VB DLL COM event in Delphi Programming
Message-ID: <200905270250.n4R2oQTZ019353@pp-proxy01.tm.net.my>

Dear Sir,

I have a question regarding Delphi COM programming. I have a VB DLL (ActiveX
COM DLL) and this DLL contain 2 classes, one is for normal client function
calling, and the other one is events raised by this DLL to notify the
client. Now, I would like to incorporate this DLL into Delphi (bind the DLL
into Delphi program) so that when the events raised by this DLL,  it can be
capture in the Delphi program. I am new in Delphi and I would like to need
your help or advice on this integration. I could send you the sample code in
VB and the VB DLL if you need. Thanks in advance.

 

Best regards,

Tan, Yih Hung

 

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From ldo at geek-central.gen.new_zealand  Tue May 26 23:17:40 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 15:17:40 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<gvgk6s$bpr$1@lust.ihug.co.nz> <m2d49w2cfn.fsf@googlemail.com>
Message-ID: <gvibck$bsq$1@lust.ihug.co.nz>

In message <m2d49w2cfn.fsf at googlemail.com>, Arnaud Delobelle wrote:

> That's why I use ed.

After 20 years of suffering with vi, I finally decided to switch to Emacs. 
Yes, it has lots of fancy features and "modes" and things, but it wasn't 
hard to figure out how to turn the intrusive stuff off, and still leave a 
very powerful and useful editor.



From ldo at geek-central.gen.new_zealand  Tue May 26 23:20:58 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 15:20:58 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<mailman.752.1243344314.8015.python-list@python.org>
Message-ID: <gvibiq$bsq$2@lust.ihug.co.nz>

In message <mailman.752.1243344314.8015.python-list at python.org>, Jean-Michel 
Pichavant wrote:

> Why buy an IDE when you just need a text editor ?

Because all the cool kids have one. If you want to be different and 
individual like them, you have to have what they have.



From ldo at geek-central.gen.new_zealand  Tue May 26 23:23:29 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 15:23:29 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com> <4A1C0806.2090802@seehart.com>
	<mailman.764.1243352981.8015.python-list@python.org>
	<roy-97FE62.19585126052009@news.panix.com>
Message-ID: <gvibnh$bsq$3@lust.ihug.co.nz>

In message <roy-97FE62.19585126052009 at news.panix.com>, Roy Smith wrote:

> The real problem is when you get dumped into some editor other than you
> one you expected and don't realize it for a while.  It's really amazing
> how much damage you can do to a file by typing (for example) emacs
> commands at vi.

Doesn't work the other way round, though. All you'll likely succeed in doing 
is putting the vi commands into the file.

This, ladies and gentlemen of the jury, points up the essential difference 
between a modal and a non-modal way of doing things.



From gallium.arsenide at gmail.com  Tue May 26 23:25:15 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Tue, 26 May 2009 20:25:15 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
Message-ID: <0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>

On May 26, 9:43?am, Mel <mwil... at the-wire.com> wrote:

> ?SciTE
> I like one big uncomplicated window, tabbed file panes,
> syntax coloring and help with indentation. ?There's
> nothing to it I hate. ?It would be nice if
> customization were easier.

This is a decent summary of SciTE, but I kind of marvel at how few
people complain about its Python indentation.  (I'd like to think it's
because anyone who edits Python code in SciTE has downloaded my patch,
but I am confident that is not the case.)

John


From steven at REMOVE.THIS.cybersource.com.au  Tue May 26 23:43:39 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 27 May 2009 03:43:39 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
	<gvb8kn$7gm$2@lust.ihug.co.nz>
	<mailman.674.1243192904.8015.python-list@python.org>
	<gvd6c0$bqs$1@lust.ihug.co.nz>
	<pan.2009.05.25.05.22.14@REMOVE.THIS.cybersource.com.au>
	<gvhu8v$4ff$1@lust.ihug.co.nz>
Message-ID: <pan.2009.05.27.03.43.38@REMOVE.THIS.cybersource.com.au>

On Wed, 27 May 2009 11:33:51 +1200, Lawrence D'Oliveiro wrote:

> Chaitin is trying to use only computable numbers. Pi is computable, as
> is e, sqrt(2), the Feigenbaum constant, and many others familiar to us
> all.
> 
> Trouble is, they only make up 0% of the reals. It's the other 100% he
> wants to get rid of.


+1 QOTD


-- 
Steven


From mr.ankitavasthi at gmail.com  Wed May 27 00:48:53 2009
From: mr.ankitavasthi at gmail.com (Ankit)
Date: Tue, 26 May 2009 21:48:53 -0700 (PDT)
Subject: which database is suitable for small applications
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com> 
	<mailman.744.1243333471.8015.python-list@python.org>
Message-ID: <52801358-c037-458d-8857-a78c2d881ddb@z16g2000prd.googlegroups.com>

Hi Kalyan...

If your application does not require you to add very heavy data then
you can also use flat files to do your stuff.
Its always a better to use Databases but given your low level use and
newness to python... i would advise you to take up flat files instead.

store your data there and access it.. simple!

ANkit


From mr.ankitavasthi at gmail.com  Wed May 27 00:56:06 2009
From: mr.ankitavasthi at gmail.com (Ankit)
Date: Tue, 26 May 2009 21:56:06 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<85d49wf22f.fsf@agentultra.com>
Message-ID: <762354ae-1d82-4a1f-aa49-eabd8f9a0173@f37g2000pro.googlegroups.com>

On May 26, 6:04?pm, J Kenneth King <ja... at agentultra.com> wrote:
> Lacrima <Lacrima.Ma... at gmail.com> writes:
> > I am new to python.
> > And now I am using trial version of Wing IDE.
> > But nobody mentioned it as a favourite editor.
> > So should I buy it when trial is expired or there are better choices?
>

I will suggest u to use TEXTPAD 4 on windows and
Emacs or Vi or RocketEdit on your Linux machine



From jaime.frio at gmail.com  Wed May 27 01:10:05 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Wed, 27 May 2009 07:10:05 +0200
Subject: How do I sample randomly based on some probability(wightage)?
In-Reply-To: <c9566044-6e50-42ca-aa02-9ff63206c601@g22g2000pra.googlegroups.com>
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<c9566044-6e50-42ca-aa02-9ff63206c601@g22g2000pra.googlegroups.com>
Message-ID: <97a8f1a70905262210m6e846b0ci1fd7465d2864a06c@mail.gmail.com>

On Tue, May 26, 2009 at 8:42 PM, Sumitava Mukherjee
<smukh at cognobytes.com> wrote:
> On May 26, 11:39?pm, Sumitava Mukherjee <sm... at cognobytes.com> wrote:
>
>>>>> [Oh, I forgot to mention. I am looking for sampling without replacement.]

That means that, you'll have to code something that updates the sums
of probabilities after each extraction...

Would there be a smart way of doing this, of just adding the whole
updated list again is the best, or at least good enough?

-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From tiskanto at gmail.com  Wed May 27 01:29:40 2009
From: tiskanto at gmail.com (Teguh Iskanto)
Date: Wed, 27 May 2009 15:29:40 +1000
Subject: What text editor is everyone using for Python
In-Reply-To: <762354ae-1d82-4a1f-aa49-eabd8f9a0173@f37g2000pro.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<85d49wf22f.fsf@agentultra.com>
	<762354ae-1d82-4a1f-aa49-eabd8f9a0173@f37g2000pro.googlegroups.com>
Message-ID: <e137e8260905262229r17755adax7003df44b8954eda@mail.gmail.com>

Have you tried vim ? it has got tons of tons of features, like ( just
to name a few)  : file manager, color syntax, tab screen,
command/syntax completion (cache only) , vertical split, horizontal
split, colorful diffing, create a patch, etc .. you name it  !! .
There's also plugins / script that people share @
http://www.vim.org/scripts/index.php. Also Vim comes in Windows/Unix
version :)

IMO, you don't even need an IDE, if you combined vim + "screen" ( man
screen ) as both are really powerful tools
for example: you're working in the office and connected to your remote
CVS server, with "screen" you can lock the screen with password &
detach it. once you're @ home and want to continue to work , you just
need to log in to that cvs server again and do "screen -r" and voila
your session is still there :)

BTW: "screen" does split screen too :)

HTH




On Wed, May 27, 2009 at 2:56 PM, Ankit <mr.ankitavasthi at gmail.com> wrote:
> On May 26, 6:04?pm, J Kenneth King <ja... at agentultra.com> wrote:
>> Lacrima <Lacrima.Ma... at gmail.com> writes:
>> > I am new to python.
>> > And now I am using trial version of Wing IDE.
>> > But nobody mentioned it as a favourite editor.
>> > So should I buy it when trial is expired or there are better choices?
>>
>
> I will suggest u to use TEXTPAD 4 on windows and
> Emacs or Vi or RocketEdit on your Linux machine
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From ldo at geek-central.gen.new_zealand  Wed May 27 01:52:07 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 17:52:07 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<85d49wf22f.fsf@agentultra.com>
	<762354ae-1d82-4a1f-aa49-eabd8f9a0173@f37g2000pro.googlegroups.com>
	<mailman.786.1243402183.8015.python-list@python.org>
Message-ID: <gvike7$h38$1@lust.ihug.co.nz>

In message <mailman.786.1243402183.8015.python-list at python.org>, Teguh 
Iskanto wrote:

> Have you tried vim ? it has got tons of tons of features ...

So has everything else these days.

> for example: you're working in the office and connected to your remote
> CVS server ...

Wouldn't it be easier to use a distributed VCS?



From paul.nospam at rudin.co.uk  Wed May 27 01:54:37 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Wed, 27 May 2009 06:54:37 +0100
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<mailman.752.1243344314.8015.python-list@python.org>
	<gvibiq$bsq$2@lust.ihug.co.nz>
Message-ID: <87ws835bvm.fsf@rudin.co.uk>

Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> writes:

> In message <mailman.752.1243344314.8015.python-list at python.org>, Jean-Michel 
> Pichavant wrote:
>
>> Why buy an IDE when you just need a text editor ?
>
> Because all the cool kids have one. If you want to be different and 
> individual like them, you have to have what they have.

Of course it's not always clear what the difference is in any
case. Emacs, for example, has most of the features of many IDEs (not to
mention many features that they lack).


From ldo at geek-central.gen.new_zealand  Wed May 27 01:55:38 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 17:55:38 +1200
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
	<gvd1id$8jj$2@lust.ihug.co.nz>
	<roy-50FE2E.07273725052009@news.panix.com>
Message-ID: <gvikkq$h38$2@lust.ihug.co.nz>

In message <roy-50FE2E.07273725052009 at news.panix.com>, Roy Smith wrote:

> In article <gvd1id$8jj$2 at lust.ihug.co.nz>,
>  Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
> 
>> In message <roy-3C4DED.09214724052009 at news.panix.com>, Roy Smith wrote:
>> 
>> > In article <gvb8fn$7gm$1 at lust.ihug.co.nz>,
>> >  Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
>> > 
>> >> The right thing to do is try to ensure that all your connections are
>> >> properly closed at shutdown. That may not be enough (if your server
>> >> crashes due to bugs), so the other thing you need to do is retry the
>> >> socket open, say, at 30-second intervals, until it succeeds.
>> > 
>> > That may be a reasonable thing to do for production code, but when
>> > you're building and debugging a server, it's a real pain to not be able
>> > to restart it quickly whenever you want (or need) to.
>> 
>> On the contrary, I run exactly the same logic--and that includes socket-
>> handling logic--in both test and production servers. How else can I be
>> sure it'll work properly in production?
> 
> I was just pointing out how it can be useful in cases such as the OP's,
> where he's getting bind errors when he restarts his server.

And I was pointing out how important it was to make sure your code deals 
gracefully with those errors.



From ben+python at benfinney.id.au  Wed May 27 02:41:08 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 27 May 2009 16:41:08 +1000
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<pan.2009.05.26.05.01.13@REMOVE.THIS.cybersource.com.au>
	<mailman.738.1243324787.8015.python-list@python.org>
	<pan.2009.05.26.08.56.03@REMOVE.THIS.cybersource.com.au>
Message-ID: <87my8zxd2z.fsf@benfinney.id.au>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:

> nano is basically an updated (forked?) version of pico.

Re-implemented <URL:http://www.nano-editor.org/dist/v1.2/faq.html#6>.
Pico was under a non-free license, so Nano was written to be a
feature-compatible free-software clone.

-- 
 \     ?If you ever catch on fire, try to avoid seeing yourself in the |
  `\        mirror, because I bet that's what REALLY throws you into a |
_o__)                                             panic.? ?Jack Handey |
Ben Finney


From ben+python at benfinney.id.au  Wed May 27 02:44:51 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 27 May 2009 16:44:51 +1000
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <87iqjnxcws.fsf@benfinney.id.au>

Lacrima <Lacrima.Maxim at gmail.com> writes:

> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

I think your time will be better spent learning a powerful, mature,
well-supported, free-software, programmable editor with support for an
enormous range of text processing tasks.

Either of Vim or Emacs qualify. Language-specific IDEs do not.

-- 
 \             ?Ladies are requested not to have children in the bar.? |
  `\                                          ?cocktail lounge, Norway |
_o__)                                                                  |
Ben Finney


From ben+python at benfinney.id.au  Wed May 27 03:07:25 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 27 May 2009 17:07:25 +1000
Subject: How to ask smart questions question
References: <gvgkiv$61t$1@aioe.org>
	<mailman.756.1243349312.8015.python-list@python.org>
	<960af9f3-c445-4d6d-b277-76a123ee4dcd@s28g2000vbp.googlegroups.com>
Message-ID: <87eiubxbv6.fsf@benfinney.id.au>

Carl Banks <pavlovevidence at gmail.com> writes:

> On May 26, 7:48?am, Gary Herron <gher... at islandtraining.com> wrote:
> > The proper response to a question like this has to be ?
> > ?http://www.catb.org/~esr/faqs/smart-questions.html as anything else
> > is complete guesswork.
> 
> Is there a Cliff's Notes version of this?
> 
> I may be a cynic but I would think the people who ask bad questions
> are the same sort of people who won't have the patience to sit though
> this behemoth of an essay.

To the extent that's the case, then it benefits the community as a
filter, by making it easier to detect those who aren't going to read a
good essay on how to participate in a community of question-answerers.

On the other hand, I prefer to give questioners the benefit of the doubt
by not discounting the possibility that they *can* read and learn how to
improve the quality of their questions.

> And I may be a romantic but I would think most people who post this
> are really trying to be helpful and not just saying, "Out of my midst,
> vile newbie, until thou hearkenst unto the sacred words".

Posting a reference to the ?asking questions the smart way? essay is,
at least most of the times I've seen it, an explicit effort to be
helpful to the questioner *and* to the community that bears the load of
finding out what the questioner needs answered ? both in this instance,
and in any future instance when people who read that suggestion want to
ask other questions.

-- 
 \      ?When I wake up in the morning, I just can't get started until |
  `\     I've had that first, piping hot pot of coffee. Oh, I've tried |
_o__)                                    other enemas...? ?Emo Philips |
Ben Finney


From robertsong.linux at gmail.com  Wed May 27 03:37:45 2009
From: robertsong.linux at gmail.com (robert song)
Date: Wed, 27 May 2009 16:37:45 +0900
Subject: Can pdb debugger save history list ?
Message-ID: <3e004f8e0905270037l7977f09dl9fe8a466cbaf8fbd@mail.gmail.com>

Hello,everyone.
Is there any configure file that can be set to save history list for
python gdb debugger?

thank you very much.


From jeremiah.dodds at gmail.com  Wed May 27 04:35:54 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Wed, 27 May 2009 09:35:54 +0100
Subject: What text editor is everyone using for Python
In-Reply-To: <e137e8260905262229r17755adax7003df44b8954eda@mail.gmail.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<85d49wf22f.fsf@agentultra.com>
	<762354ae-1d82-4a1f-aa49-eabd8f9a0173@f37g2000pro.googlegroups.com>
	<e137e8260905262229r17755adax7003df44b8954eda@mail.gmail.com>
Message-ID: <12cbbbfc0905270135o608c2f74j81e7d25dd4e239cb@mail.gmail.com>

On Wed, May 27, 2009 at 6:29 AM, Teguh Iskanto <tiskanto at gmail.com> wrote:

>
>
> BTW: "screen" does split screen too :)
>
> HTH
>
>
Unfortunately, screen only does horizontal splitting. (I heard that vertical
splitting is supposed to be in the next version of it, and is in the dev
trunk, but I don't know).

That said, screen is possibly the second most useful tool in my toolbox,
right behind emacs. If you need to interact with different machines, it's a
lifesaver. Actually, even if you don't, but you find yourself with a bunch
of terminals open (whether you're in X or not), it's still incredibly
useful.

I know this is supposed to be a discussion about text editors, but I think
that screen does deserve a mention as being very complementary to a good
text editor if you're a programmer.
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From wu at madk.org  Wed May 27 05:25:45 2009
From: wu at madk.org (Wu Zhe)
Date: Wed, 27 May 2009 17:25:45 +0800
Subject: Multiprocessing problem with producer/consumer
Message-ID: <87y6si99t2.fsf@tank.madk.org>


I am writing a server program with one producer and multiple consumers,
what confuses me is only the first task producer put into the queue gets
consumed, after which tasks enqueued no longer get consumed, they remain
in the queue forever.

from multiprocessing import Process, Pool, Queue, cpu_count
from http import httpserv

def work(queue):
    while True:
        task = queue.get()
        if task is None:
            break
        time.sleep(5)
        print "task done:", task
    queue.put(None)

class Manager:
    def __init__(self):
        self.queue = Queue()
        self.NUMBER_OF_PROCESSES = cpu_count()

    def start(self):
        self.workers = [Process(target=work, args=(self.queue,))
                        for i in xrange(self.NUMBER_OF_PROCESSES)]
        for w in self.workers
            w.start()

        httpserv(self.queue)

    def reload(self):
        print "RELOAD"

    def stop(self):
        self.queue.put(None)
        for i in range(self.NUMBER_OF_PROCESS):
            self.workers[i].join()
        queue.close()

Manager().start()

The producer is a HTTP server which put a task in the queue once receive
a request from the user. It seems that consumer processes are still
blocked when there are new tasks in the queue, which is weird.

P.S. Another two questions not relating to the above, I am not sure if
it's better to put HTTP server in its own process other than the main
process, if yes how can I make the main process keep running before all
children processes end. Second question, what's the best way to stop the
HTTP server gracefully?


From ldo at geek-central.gen.new_zealand  Wed May 27 05:32:35 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 21:32:35 +1200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
Message-ID: <gvj1bj$og1$3@lust.ihug.co.nz>

In message <mailman.766.1243354300.8015.python-list at python.org>, Dennis Lee 
Bieber wrote:

> Notice that db.literal() call? That's part of the mechanism used to
> escape and quote parameters -- it only returns strings that are safe for
> insertion into the SQL statement.

Does it deal with "like"-wildcards?



From kalyanchakravarthy at hyit.com  Wed May 27 05:35:58 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Wed, 27 May 2009 15:05:58 +0530
Subject: which database is suitable for small applications
In-Reply-To: <52801358-c037-458d-8857-a78c2d881ddb@z16g2000prd.googlegroups.com>
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
	<mailman.744.1243333471.8015.python-list@python.org>
	<52801358-c037-458d-8857-a78c2d881ddb@z16g2000prd.googlegroups.com>
Message-ID: <8ca278430905270235n221ce4e9m25c0218ba32e65a5@mail.gmail.com>

Hi Ankit,
             Thanks for your  advice, can I get some sample code, to store
data in to flat files and how to give flat file connections to my Python
code, Because I am very new to Python and flat files

  Thanks in Advance

Kalyan

On Wed, May 27, 2009 at 10:18 AM, Ankit <mr.ankitavasthi at gmail.com> wrote:

> Hi Kalyan...
>
> If your application does not require you to add very heavy data then
> you can also use flat files to do your stuff.
> Its always a better to use Databases but given your low level use and
> newness to python... i would advise you to take up flat files instead.
>
> store your data there and access it.. simple!
>
> ANkit
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Regards
Kalyan
Mobile no: +91 9985351220
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From paul at boddie.org.uk  Wed May 27 05:45:18 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Wed, 27 May 2009 02:45:18 -0700 (PDT)
Subject: DB-API execute params, am I missing something?
References: <mailman.745.1243338813.8015.python-list@python.org>
Message-ID: <a5e204d6-29df-4637-81cd-8b8c1f485a1a@k38g2000yqh.googlegroups.com>

On 26 Mai, 13:46, Gabriel Rossetti <gabriel.rosse... at arimaz.com>
wrote:
>
> def getParams(curs):
> ? ? curs.execute("select * from param where id=%d", 1001)

First of all, you should use the database module's parameter style,
which is probably "%s" - something I've thought should be deprecated
for a long time due to the confusion with string substitution that
this causes, regardless of whether that mechanism is actually used
internally by the module (as seen in your traceback).

You also have to provide a sequence of parameters: unlike string
substitution, you cannot provide a single parameter value and expect
the execute method to do the right thing. Some database modules seem
to insist on either lists or tuples of parameters, but I think any
sequence type should work.

Try this:

  curs.execute("select * from param where id=%s", (1001,))

Paul


From deets at nospam.web.de  Wed May 27 05:58:49 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 27 May 2009 11:58:49 +0200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz>
Message-ID: <784h2cF1kem0kU1@mid.uni-berlin.de>

Lawrence D'Oliveiro wrote:

> In message <mailman.766.1243354300.8015.python-list at python.org>, Dennis
> Lee Bieber wrote:
> 
>> Notice that db.literal() call? That's part of the mechanism used to
>> escape and quote parameters -- it only returns strings that are safe for
>> insertion into the SQL statement.
> 
> Does it deal with "like"-wildcards?

Why shouldn't it? 

cursor.execute("select * from table where column like %s", "%name%")

Diez


From marco.bartolini at gmail.com  Wed May 27 06:55:43 2009
From: marco.bartolini at gmail.com (flyingfrog)
Date: Wed, 27 May 2009 03:55:43 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<87iqjnxcws.fsf@benfinney.id.au>
Message-ID: <c94ad3e3-4df1-4e64-b939-f205394faf9b@q2g2000vbr.googlegroups.com>

On 27 Mag, 08:44, Ben Finney <ben+pyt... at benfinney.id.au> wrote:
> Lacrima <Lacrima.Ma... at gmail.com> writes:
> > I am new to python.
> > And now I am using trial version of Wing IDE.
> > But nobody mentioned it as a favourite editor.
> > So should I buy it when trial is expired or there are better choices?
>
> I think your time will be better spent learning a powerful, mature,
> well-supported, free-software, programmable editor with support for an
> enormous range of text processing tasks.
>
> Either of Vim or Emacs qualify. Language-specific IDEs do not.
>
> --
>  \             ?Ladies are requested not to have children in the bar.? |
>   `\                                          ?cocktail lounge, Norway |
> _o__)                                                                  |
> Ben Finney

I like using VIM.
At this page http://blog.dispatched.ch/2009/05/24/vim-as-python-ide/
you can find some hints about how to setup some nice plugin that ease
python (and others) development.


From piet at cs.uu.nl  Wed May 27 07:12:03 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 27 May 2009 13:12:03 +0200
Subject: pyparsing question: single word values with a double quoted
	string every once in a while
References: <c3c9c0a6-2229-4f80-873c-99a43ed3a36f@s38g2000prg.googlegroups.com>
Message-ID: <m2d49u6br0.fsf@cs.uu.nl>

>>>>> hubritic <colinlandrum at gmail.com> (h) wrote:

>h> I want to parse a log that has entries like this:
>h> [2009-03-17 07:28:05.545476 -0500] rprt s=d2bpr80d6 m=2 mod=mail
>h> cmd=msg module=access rule=x_dynamic_ip action=discard attachments=0
>h> rcpts=1
>h> routes=DL_UK_ALL,NOT_DL_UK_ALL,default_inbound,firewallsafe,mail01_mail02,spfsafe
>h> size=4363 guid=291f0f108fd3a6e73a11f96f4fb9e4cd hdr_mid=
>h> qid=n2HCS4ks025832 subject="I want to interview you" duration=0.236
>h> elapsed=0.280


>h> the keywords will not always be the same. Also differing log levels
>h> will provide a different mix of keywords.

>h> This is good enough to get the majority of cases where there is a
>h> keyword, a "=" and then a value with no spaces:

>h> Group(Word(alphas + "+_-.").setResultsName("keyword") +  Suppress
>h> (Literal ("=")) + Optional(Word(printables)))

>h> Sometimes there is a subject, which is a quoted string. That is easy
>h> enough to get with this:
>h> dblQuotedString(ZeroOrMore(Word(printables) ) )

>h> My problem is combining them into one expression. Either I wind up
>h> with just the subject or I wind up with they keywords and their
>h> values, one of which is:

>h> subject, '"I'

>h> which is clearly not what I want.

>h> Do I scan each line twice, first looking for quotes ?


Use the MatchFirst (|)

I have also split it up to make it more readable

kw = Word(alphas + "+_-.").setResultsName("keyword") 
eq = Suppress(Literal ("="))
value = dblQuotedString | Optional(Word(printables))

pattern = Group(kw + eq + value)

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From noone at example.com  Wed May 27 08:25:58 2009
From: noone at example.com (Jon Bendtsen)
Date: Wed, 27 May 2009 14:25:58 +0200
Subject: nntplib.NNTPTemporaryError: 441 Article has no body -- just headers
Message-ID: <gvjbgm$12up$1@munin.diku.dk>

Hi

I'm trying to expand cvsmail.py so it posts to newsgroups, but i
constantly get this error message:
nntplib.NNTPTemporaryError: 441 Article has no body -- just headers

If i put the test message into a file then i can post it just fine,
no problems. But if i put the message into a StringIO, then i can
not post messages and i get the above error message. Where is the
problem?

>>> buffer=StringIO()
>>> f = open('/tmp/article')
>>> buffer.write(f.read())
>>> s=nntplib.NNTP('dknntp.laerdal.global')
>>> s.post(buffer)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/nntplib.py", line 570, in post
    return self.getresp()
  File "/usr/lib/python2.5/nntplib.py", line 219, in getresp
    raise NNTPTemporaryError(resp)
nntplib.NNTPTemporaryError: 441 Article has no body -- just headers
>>> buffer.getvalue()
'From: root at laerdal.dk\nSubject: testing\nNewsgroups: test\nBody:
\n\n\nfoobar\n\n\n.\n\n\n'


>>> f = open('/tmp/article')
>>> s=nntplib.NNTP('dknntp.laerdal.global')
>>> s.post(f)
'240 Article posted <gvjaqv$k91$1 at dknntp.laerdal.global>'


>>> f = open('/tmp/article')
>>> f.read()
'From: root at laerdal.dk\nSubject: testing\nNewsgroups: test\nBody:
\n\n\nfoobar\n\n\n.\n\n\n'
>>> buffer.getvalue()
'From: root at laerdal.dk\nSubject: testing\nNewsgroups: test\nBody:
\n\n\nfoobar\n\n\n.\n\n\n'
>>> f = open('/tmp/article')
>>> if f.read() == buffer.getvalue():
...   print 'true'
...
true


From rustompmody at gmail.com  Wed May 27 08:31:57 2009
From: rustompmody at gmail.com (rustom)
Date: Wed, 27 May 2009 05:31:57 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<87iqjnxcws.fsf@benfinney.id.au>
	<c94ad3e3-4df1-4e64-b939-f205394faf9b@q2g2000vbr.googlegroups.com>
Message-ID: <6413d692-c3b5-40db-a53a-b000052ca0d5@y10g2000prc.googlegroups.com>

I dont think Ive seen it said on this thread (if yes sorry for missing
it)

If you use emacs

1. DONT use the python.el that comes with emacs but use python-mode.el
that comes from python
2. Use python as an interpreter ie not as you would use C or Java
or ... which is to say
2.1 Start python as an interpreter under emacs ... which (assuming
emacs is set up properly) means
2.1.1 M-x py-shell or
2.1.2 From a python source file C-c C-c
2.2 Dont (PLEASE) start a shell and start python in that; start a
genuine 'inferior' python under emacs
      (yes emacs-speak is a bit weird but once you get used to it it
has no replacement)
3. The most useful paradigm of noob hacking of python in emacs is to
split the window into 2, keep your python file in one and the inferior
python interpreter in the other.
4. After you've graduated out of noob status you may like to look at
4.1 pdb (Ive not managed to get this to run on windows)
4.2 doctest mode
4.3 rope
4.4 ipython


From abolotnov at gmail.com  Wed May 27 08:45:27 2009
From: abolotnov at gmail.com (abolotnov)
Date: Wed, 27 May 2009 05:45:27 -0700 (PDT)
Subject: Building mySQL-python with python 2.6
Message-ID: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>

Hi, I am trying to build mySQL-python with python 2.6 on windows and
can't figure what's wrong with it.

D:\temp\mysqlPyC\MySQL?python?1.2.3c1>python setup.py build
running build
running build_py
copying MySQLdb\release.py ?> build\lib.win32?2.6\MySQLdb
running build_ext
building '_mysql' extension
error: Unable to find vcvarsall.bat

the vcvarsall.bat is in %path% though:

D:\temp\mysqlPyC\MySQL?python?1.2.3c1>vcvarsall.bat
Setting environment for using Microsoft Visual Studio 2010 x86 tools.

Are there python settings that point to specific compiler directory or
something that I need to change/update?


From albert at spenarnc.xs4all.nl  Wed May 27 08:58:02 2009
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 27 May 2009 12:58:02 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de>
	<02204669$0$25303$c3e8da3@news.astraweb.com>
Message-ID: <kkb00q.g62@spenarnc.xs4all.nl>

In article <02204669$0$25303$c3e8da3 at news.astraweb.com>,
Steven D'Aprano  <steve at REMOVE-THIS-cybersource.com.au> wrote:
>On Sun, 17 May 2009 18:24:34 +0200, Diez B. Roggisch wrote:
>
>>> But reduce()? I can't see how you can parallelize reduce(). By its
>>> nature, it has to run sequentially: it can't operate on the nth item
>>> until it is operated on the (n-1)th item.
>>
>> That depends on the operation in question. Addition for example would
>> work.
>
>You'd think so, but you'd be wrong. You can't assume addition is always
>commutative.
>
>>>> reduce(operator.add, (1.0, 1e57, -1e57))
>0.0
>>>> reduce(operator.add, (1e57, -1e57, 1.0))
>1.0
>
>
>
>> My math-skills are a bit too rusty to qualify the exact nature of
>> the operation, commutativity springs to my mind.
>
>And how is reduce() supposed to know whether or not some arbitrary
>function is commutative?

Why would it or need it? A Python that understands the ``par''
keyword is supposed to know it can play some tricks with
optimizing reduce() if the specific function is commutative.

>--
>Steven

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- like all pyramid schemes -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From lists at cheimes.de  Wed May 27 08:58:40 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 27 May 2009 14:58:40 +0200
Subject: Building mySQL-python with python 2.6
In-Reply-To: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>
Message-ID: <4A1D3900.8070706@cheimes.de>

abolotnov schrieb:
> Hi, I am trying to build mySQL-python with python 2.6 on windows and
> can't figure what's wrong with it.
> 
> D:\temp\mysqlPyC\MySQL?python?1.2.3c1>python setup.py build
> running build
> running build_py
> copying MySQLdb\release.py ?> build\lib.win32?2.6\MySQLdb
> running build_ext
> building '_mysql' extension
> error: Unable to find vcvarsall.bat
> 
> the vcvarsall.bat is in %path% though:
> 
> D:\temp\mysqlPyC\MySQL?python?1.2.3c1>vcvarsall.bat
> Setting environment for using Microsoft Visual Studio 2010 x86 tools.

You need Visual Studio 2008. Other versions of VS aren't supported by
Python 2.6.

Christian


From abolotnov at gmail.com  Wed May 27 09:01:17 2009
From: abolotnov at gmail.com (abolotnov)
Date: Wed, 27 May 2009 06:01:17 -0700 (PDT)
Subject: Building mySQL-python with python 2.6
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>
	<mailman.793.1243429122.8015.python-list@python.org>
Message-ID: <9664ac1f-0760-4be8-9e2f-7746af5cf7aa@y9g2000yqg.googlegroups.com>


> You need Visual Studio 2008. Other versions of VS aren't supported by
> Python 2.6.

Aren't 2005, 2008+ versions all have same c compiler - it's just the
IDE versions that are different?


From imanway4444 at gmail.com  Wed May 27 09:20:57 2009
From: imanway4444 at gmail.com (sunnia)
Date: Wed, 27 May 2009 06:20:57 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<01076ad2-705b-4aea-9867-d19d4adc6693@m17g2000vbi.googlegroups.com>
	<mailman.468.1242855538.8015.python-list@python.org>
Message-ID: <d4f08814-4f5e-4ded-b9ae-2c8e0a177c21@g37g2000yqn.googlegroups.com>

On May 20, 10:38?pm, Luis Zarrabeitia <ky... at uh.cu> wrote:
> On Wednesday 20 May 2009 04:32:59 pm Carl Banks wrote:
>
> > I wasn't really arguing that locking individual objects was a
> > significant penalty in computer time, only in programmer time. ?The
> > locks on reference counts are what's expensive.
>
> > Also, I'm not using it as an argument against removing the GIL. ?I
> > want to remove the GIL. ?I'm only pointing out that removing the GIL
> > is not easy, and once it's removed there is a cost.
>
> Ah, allright then. Thanks for the clarification.
>
> --
> Luis Zarrabeitia (aka Kyrie)
> Fac. de Matem?tica y Computaci?n, UH.http://profesores.matcom.uh.cu/~kyrie

The Judicial System in Islam : Its Legal Basis and Islam Ruling
Please forgive us for any disturbance, but we have an important
subject to address to you regarding FAITH, and we Don?t intend to
overload your email with unnecessary messages?

The Judicial System in Islam : Its Legal Basis and Islam Ruling

By The Editorial Team of Dr. Abdurrahman al-Muala (translated by
islamtoday.com)


Defining the Judicial System and its Legal basis

The judicial system in Islam is a system for deciding between people
in litigation with the aim of settling their disputes in accordance
with the injunctions of the Divine Law, injunctions that are taken
from the Quran and Sunnah.

All of the Messengers of God (may God praise them all) acted as
judges. God says:

?And remember David and Solomon, when they gave judgment concerning
the field when people?s sheep had browsed therein at night, and We
were witness to their judgment. And We made Solomon to understand the
case. And to each of them We gave good judgment and knowledge.? (Quran
21:78-79)
God also says:

?O David, verily we have placed you as a successor on Earth, so judge
between people in truth, and do not follow your desires for it will
mislead you from the path of God. Verily, those who stray from the
path of God have a severe punishment because they forgot the day of
reckoning.? (Quran 38:26)

Prophet Muhammad, who came with the final and eternal Message, was
ordered by God to pass judgment in disputes just as he was ordered to
spread the word of God and call people to Islam. This is mentioned in
the Quran in a number of places. God says, for instance:

?So judge (O Muhammad) between them by what God has revealed and do
not follow their vain desires, but beware of them lest they turn you
away from some of what God has sent down to you.? (Quran 5:49)

God also says:

??And if you judge (O Muhammad), judge between them with justice.
Verily, God loves those who act justly.? (Quran 5:42)

And He says:

?But no, by your Lord, they shall have no faith until they make you (O
Muhammad) judge in all their disputes and find in themselves no
resistance against your decisions and accept them with full
submission.? (Quran 4:65)

The Sunnah also provides for the legal basis of the Islamic judicial
system. It is related by Amr b. al-Aas that the Prophet said:

?If a judge gives a judgment using his best judgment and is correct,
then he receives a double reward (from God). If he uses his best
judgment but makes a mistake, then he receives a single
reward.? (Ahmed)

God?s Messenger said:

?You should not wish to be like other people, except in two cases: a
man who God has given wealth and he spends it on Truth and another who
God has granted wisdom and he gives verdicts on its basis and teaches
others.? (Saheeh Al-Bukhari, Saheeh Muslim)

Many scholars have related to us that there is consensus among Muslims
on the legal status of the judicial system in Islam. Ibn Qudamah says:

?The Muslims are unanimously agreed that a judicial system must be
established for the people.?
The Islamic Ruling Concerning the Judiciary

The jurists agree that the duties of the judge are an obligation that
must be carried out by society. If some members of society carry out
this duty, it is sufficient for everyone. If, on the other hand,
everyone neglects it, then everyone in society is sinful.

The proof that these duties are obligatory comes from the Quran:

?O you who believe! Stand out firmly for justice...? (Quran 4:135)

It is only necessary for a small number of individuals to perform
judicial duties since judicial concerns come under the broad duty of
enjoining what is right and forbidding what is wrong. It is not
obligatory for every individual to carry out this duty as long as some
people are doing so.

The affairs of the people will not be correct and upright without a
judicial system. It is, consequently, obligatory for one to exist,
just like it is necessary to have a military. Imam Ahmad, one of the
greatest and most well-known scholars of Islam said:

?People have to have a judicial authority or their rights will
disappear.?

The duties of the judiciary include enjoining what is right, helping
the oppressed, securing people?s rights, and keeping oppressive
behavior in check. None of these duties can be performed without the
appointment of a judiciary.

A judicial system is a necessity for the prosperity and development of
nations. It is needed to secure human happiness, protect the rights of
the oppressed, and restrain the oppressor. It is the way to resolve
disputes and ensure human rights. It facilitates enjoining what is
right, forbidding what is wrong, and curbing immoral behavior. In this
way, a just social order can be enjoyed by all sectors of society, and
every individual can feel secure in his life, property, honor, and
liberty. In this environment, nations can progress, civilization can
be achieved, and people are free to pursue what will better them both
spiritually and materially.




???????????-


For more information about Islam

http://english.islamway.com/

http://www.islamhouse.com/

http://www.discoverislam.com/

http://www.islambasics.com/index.php

http://english.islamway.com/

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http://www.islamweb.net/ver2/MainPage/indexe.php

http://www.sultan.org/

http://www.islamonline.net/

Contact Us At

imanway.qa at gmail.com





From lists at cheimes.de  Wed May 27 09:27:38 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 27 May 2009 15:27:38 +0200
Subject: Building mySQL-python with python 2.6
In-Reply-To: <9664ac1f-0760-4be8-9e2f-7746af5cf7aa@y9g2000yqg.googlegroups.com>
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>	<mailman.793.1243429122.8015.python-list@python.org>
	<9664ac1f-0760-4be8-9e2f-7746af5cf7aa@y9g2000yqg.googlegroups.com>
Message-ID: <4A1D3FCA.4020901@cheimes.de>

abolotnov schrieb:
>> You need Visual Studio 2008. Other versions of VS aren't supported by
>> Python 2.6.
> 
> Aren't 2005, 2008+ versions all have same c compiler - it's just the
> IDE versions that are different?

There are important differences between the several versions of VC++.
The most important discrepancy is the runtime library version. Each
version of Visual Studio uses its own msvcrt dll. The command line
options, deprecated functions, project file formats and other things are
also slightly different.

Christian


From google at mrabarnett.plus.com  Wed May 27 10:35:23 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 27 May 2009 15:35:23 +0100
Subject: Question in VB DLL COM event in Delphi Programming
In-Reply-To: <200905270250.n4R2oQTZ019353@pp-proxy01.tm.net.my>
References: <200905270250.n4R2oQTZ019353@pp-proxy01.tm.net.my>
Message-ID: <4A1D4FAB.3010901@mrabarnett.plus.com>

Tan, Yih Hung wrote:
> I have a question regarding Delphi COM programming. I have a VB DLL 
> (ActiveX COM DLL) and this DLL contain 2 classes, one is for normal 
> client function calling, and the other one is events raised by this DLL 
> to notify the client. Now, I would like to incorporate this DLL into 
> Delphi (bind the DLL into Delphi program) so that when the events raised 
> by this DLL,  it can be capture in the Delphi program. I am new in 
> Delphi and I would like to need your help or advice on this integration. 
> I could send you the sample code in VB and the VB DLL if you need. 
> Thanks in advance.
> 
This newsgroup is for the Python programming language. You'll have a
better chance of help with Delphi from a Delphi newsgroup.


From google at mrabarnett.plus.com  Wed May 27 10:44:48 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 27 May 2009 15:44:48 +0100
Subject: Multiprocessing problem with producer/consumer
In-Reply-To: <87y6si99t2.fsf@tank.madk.org>
References: <87y6si99t2.fsf@tank.madk.org>
Message-ID: <4A1D51E0.3000503@mrabarnett.plus.com>

Wu Zhe wrote:
> I am writing a server program with one producer and multiple consumers,
> what confuses me is only the first task producer put into the queue gets
> consumed, after which tasks enqueued no longer get consumed, they remain
> in the queue forever.
> 
> from multiprocessing import Process, Pool, Queue, cpu_count
> from http import httpserv
> 
> def work(queue):
>     while True:
>         task = queue.get()
>         if task is None:
>             break
>         time.sleep(5)

The 'time' module hasn't been imported, so the worker raises an
exception when it gets to this line and then terminates.

>         print "task done:", task
>     queue.put(None)
> 
> class Manager:
>     def __init__(self):
>         self.queue = Queue()
>         self.NUMBER_OF_PROCESSES = cpu_count()
> 
>     def start(self):
>         self.workers = [Process(target=work, args=(self.queue,))
>                         for i in xrange(self.NUMBER_OF_PROCESSES)]
>         for w in self.workers

Missing ":" on the end of the line.

>             w.start()
> 
>         httpserv(self.queue)
> 
>     def reload(self):
>         print "RELOAD"
> 
>     def stop(self):
>         self.queue.put(None)
>         for i in range(self.NUMBER_OF_PROCESS):

Should be "self.NUMBER_OF_PROCESSES".

>             self.workers[i].join()
>         queue.close()
> 
> Manager().start()
> 
> The producer is a HTTP server which put a task in the queue once receive
> a request from the user. It seems that consumer processes are still
> blocked when there are new tasks in the queue, which is weird.
> 
> P.S. Another two questions not relating to the above, I am not sure if
> it's better to put HTTP server in its own process other than the main
> process, if yes how can I make the main process keep running before all
> children processes end. Second question, what's the best way to stop the
> HTTP server gracefully?



From ethan at stoneleaf.us  Wed May 27 10:55:12 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Wed, 27 May 2009 07:55:12 -0700
Subject: dbfpy - cannot store new record
In-Reply-To: <4A157902.9080507@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com> <4A157902.9080507@shopzeus.com>
Message-ID: <4A1D5450.80003@stoneleaf.us>

Laszlo Nagy wrote:
> Here is the next problem. For boolean/logical fields, I can set their 
> value to True/False easily. However, setting NULL seems impossible:
> 
> rec = tbl.newRecord()
> rec["SOMEFIELD1"] = True # Works fine
> rec["SOMEFIELD2"] = False # Works fine
> rec["SOMEFIELD3"] = None # Will store False
> rec["SOMEFIELD3"] = 0 # Will store False
> rec["SOMEFIELD3"] = "" # Will store False
> rec["SOMEFIELD3"] = chr(32) # Will store False
> rec["SOMEFIELD3"] = chr(0) # Will store False
> rec.store()
> 
> Strange thing: if I do not set the value of a numeric field, it becomes 
> NULL. The same thing I cannot do for logical fields: if I do not set the 
> value of a logical field, it becomes an invalid value, denoted with a 
> question mark.
> 
> Any ideas?
> 
> Thanks,
> 
>   Laszlo
> 


Not sure if this would help, but you might try

http://groups.google.com/group/python-dbase

At this point, the only data types allowed to be Null are dates and 
times, everything else is coerced to Pythons idea of nothing if not set 
(strings are '', numerics are 0, etc -- again, the only exception being 
dates and times which, IIRC, default to the moment of record creation).

Hope this helps.

~Ethan~


From kyrie at uh.cu  Wed May 27 11:07:21 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 27 May 2009 11:07:21 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <gv4st8$11t$1@ger.gmane.org>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<4A15EF9E.8070406@islandtraining.com> <gv4st8$11t$1@ger.gmane.org>
Message-ID: <200905271107.21750.kyrie@uh.cu>

On Thursday 21 May 2009 08:50:48 pm R. David Murray wrote:

> In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
> point algorithm for Python so that the shortest repr that will round
> trip correctly is what is used as the floating point repr....

Little question: what was the goal of such a change? (is there a pep for me to 
read?) Shouldn't str() do that, and leave repr as is?

While I agree that the change gets rid of the weekly newbie question 
about "python's lack precision", I'd find more difficult to explain why
0.2 * 3 != 0.6 without showing them what 0.2 /really/ means.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From Scott.Daniels at Acm.Org  Wed May 27 11:08:53 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 27 May 2009 08:08:53 -0700
Subject: How do I sample randomly based on some probability(wightage)?
In-Reply-To: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <uIadnZ8appu3y4DXnZ2dnUVZ_radnZ2d@pdx.net>

Sumitava Mukherjee wrote:
> I need to randomly sample from a list where all choices have weights
> attached to them. The probability of them being choosen is dependent
> on the weights.
I am not sure why everybody is normalizing by dividing the weights.
This isa possibility (I had fun writing it).

def sample_without_replacement(choices, weights):
     '''Yield elements sampled w/o replacement by weighting'''
     if len(weights) != len(choices):
         raise ValueError('%d choices, but %d weights?' % (
             len(choices), len(weights)))
     if min(weights) < 0:
         raise ValueError('Negative weights?: %s' % (
                     [(i, w) for i, w in enumerate(weights) if w < 0]))

     # look at only non-zero probabilities
     combined = [(w, v) for w, v in zip(weights, choices) if w > 0]

     # Go from highest probability down to reduce expected traversal
     combined.sort(key=operator.itemgetter(0), reverse=True)

     total = sum(w for w, v in combined) # sum(weights) also works
     while combined:
         spot = sample = random.random() * total
         for n, (weight, choice) in enumerate(combined):
             spot -= weight
             if spot <= 0:
                 break
         else:
             # n, (weight, choice) = 0, combined[0] # Highest probability
             raise ValueError('%f left after choosing %f/%f?: %s' % (
                                 spot, sample, total, combined))
         yield choice
         total -= weight
         if weight > total * 256: # arbitrary choice for recalculation
             # precision affected, rebuild
             total = sum(w for w, v in combined)
         del combined[n]
     raise ValueError('Samplng more than %d without replacement?' % (
                       sum(1 for w in weights if w > 0)))

for n in range(10):
     gen = sample_without_replacement('abcdef', [32,16,8,4,2,1])
     print gen.next(), gen.next(), gen.next()

--Scott David Daniels
Scott.Daniels at Acm.Org


From Scott.Daniels at Acm.Org  Wed May 27 11:17:51 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 27 May 2009 08:17:51 -0700
Subject: Building mySQL-python with python 2.6
In-Reply-To: <mailman.793.1243429122.8015.python-list@python.org>
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>
	<mailman.793.1243429122.8015.python-list@python.org>
Message-ID: <9-6dnT0O5_7YxYDXnZ2dnUVZ_tti4p2d@pdx.net>

Christian Heimes wrote:
> abolotnov schrieb:
>> Hi, I am trying to build mySQL-python with python 2.6 on windows and
>> can't figure what's wrong with it.
...
> You need Visual Studio 2008. Other versions of VS aren't supported by
> Python 2.6.

You might be able to use mingw32 as well.

--Scott David Daniels
Scott.Daniels at Acm.Org


From chinthakawk at gmail.com  Wed May 27 11:50:47 2009
From: chinthakawk at gmail.com (godshorse)
Date: Wed, 27 May 2009 08:50:47 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <72ea150d-cec6-422e-866b-a2450a3acccd@o5g2000prh.googlegroups.com>

On May 26, 7:07?pm, Lacrima <Lacrima.Ma... at gmail.com> wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

Hello,

I too new to Python. I tried several IDEs and ended up with Wing IDE.
I used the trial version till it expired. Then found out that Wing
team has a scaled down version of Wing IDE called 'Wing IDE 101'.
http://www.wingware.com/downloads/wingide-101

Give it a try. It just lags few functions than Wing IDE.

But its really simple and light.


From bruno.42.desthuilliers at websiteburo.invalid  Wed May 27 11:56:12 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 27 May 2009 17:56:12 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <mailman.782.1243385070.8015.python-list@python.org>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<gvg5d7$382$2@lust.ihug.co.nz>	<mailman.741.1243325683.8015.python-list@python.org>	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
Message-ID: <4a1d628f$0$6471$426a74cc@news.free.fr>

Rhodri James a ?crit :
> On Tue, 26 May 2009 14:22:29 +0100, Roy Smith <roy at panix.com> wrote:
> 
>> My pet peeve is syntax-aware editors which get things wrong.  For 
>> example,
>> the version of emacs I'm using now doesn't parse this properly:
>>
>> '''A triple-quoted string.  Some editors won't get this right'''
>>
>> The solution is to change the outer quotes to double-quotes, but it 
>> annoys me when I have to change my code to appease a tool.
> 
> It's the separate python-mode that gets this (and much else) wrong.
> The Python mode that Ubuntu packages with emacs 22.2.1 works just
> fine.

On this point, indeed. But it also lacks almost every nice feature of 
the One True python-mode (or at least did last time I had to update this 
... ubuntu box at work).



From bryanvick at gmail.com  Wed May 27 11:59:21 2009
From: bryanvick at gmail.com (Bryan)
Date: Wed, 27 May 2009 08:59:21 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <b679f757-e237-4b3a-814a-07a11cab0a76@g22g2000pra.googlegroups.com>

On May 26, 5:07?am, Lacrima <Lacrima.Ma... at gmail.com> wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

First read this and think about where you want to invest your time,
IDE or text: http://osteele.com/archives/2004/11/ides

After working in a large IDE at first, I am glad I invested time into
learning a powerful console-based text editor (VIM).  Now my entire
dev environment is accessible from any networked computer, and I can
do everything without touching that horrible mouse contraption.

Bryan



From bruno.42.desthuilliers at websiteburo.invalid  Wed May 27 12:07:26 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 27 May 2009 18:07:26 +0200
Subject: How does Python's OOP feel?
In-Reply-To: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
Message-ID: <4a1d6531$0$31019$426a34cc@news.free.fr>

Ikon a ?crit :
> I'm rather new to Python. I have PHP for my main language and I do
> some Java. They all have a very strict OO schema.

I would describe PHP's "OO schema" as "very strict" (FWIW, I wouldn't 
qualify anything PHP as "strict" in any way...)

> As I red through
> Python's tutorial it seams it has nothing of those rules. No statical,
> abstract classes, functions, or variables.

Why so ?

> I wish someone, who has experience in both Java/PHP/C# and Python
> would tell me how mush better/worse is it to program in a language
> that misses most of the OO parts!

Where did you read that these were "most of the OO parts" ? All those 
dumb qualifiers are C++/Java's very peculiar (mis)understanding of OO. 
All you need to do proper OO are objects (defined by a unique id, a 
state and a behaviour) and messages.

As far as I'm concerned, what I don't understand is how one can do OO in 
a language that has non-object "objects" (ie: primitive types etc).

Anyway... Python's object model is indeed quite different from what 
you've "learned" with Java and PHP, and you'll have to first unlearn 
most of what you think you know about OO. OTHO, once you do understand 
Python's object model and it's incredible flexibility and power, you 
won't want to hear about Java anymore. Not to say Python is the "more 
pure" OOPL ever (if that's what you're after, Smalltalk is your friend - 
but it's not really used that much nowadays...), it's firstly a very 
*practical* language, but still it's OO all the way down (everything - 
including functions and classes and modules - is an object), and it 
really makes OO easy and usefull.

My 2 cents...


From gunterhenriksen at gmail.com  Wed May 27 12:16:28 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Wed, 27 May 2009 09:16:28 -0700
Subject: What text editor is everyone using for Python
In-Reply-To: <gvibnh$bsq$3@lust.ihug.co.nz>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com> <4A1C0806.2090802@seehart.com>
	<mailman.764.1243352981.8015.python-list@python.org>
	<roy-97FE62.19585126052009@news.panix.com>
	<gvibnh$bsq$3@lust.ihug.co.nz>
Message-ID: <ab4fa3490905270916k6473aea9ydb6f3307d1856dd@mail.gmail.com>

> This, ladies and gentlemen of the jury, points
> up the essential difference between a modal and
> a non-modal way of doing things.

That is one reason I love emacs... I not only
get a selection of several "major modes", I
can also have multiple "minor modes" active at
the same time!  And I can extend it with a pure
language like LISP rather than something like
Vim which tends to prefer Python for extension.


From wong_powah at yahoo.ca  Wed May 27 12:29:27 2009
From: wong_powah at yahoo.ca (powah)
Date: Wed, 27 May 2009 09:29:27 -0700 (PDT)
Subject: download all mib files from a web page
Message-ID: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>

I want to download all mib files from the web page:
http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19

All mib filenames are of this format:
www.juniper.net/techpubs ... .txt

I write this program but has the following error.
Please help.
Thanks.

[code]
#!/usr/bin/env python
import urllib2,os,urlparse
url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
page=urllib2.urlopen(url)
f=0
links=[]
data=page.read().split("\n")
for item in data:
    if "www.juniper.net/techpubs" in item:
        httpind=item.index("www.juniper.net/techpubs")
        item=item[httpind:]
        #print "item " + item
        ind=item.index("<")
        links.append(item[:ind]) #grab all links
# download all links
for link in links:
    print "link " + link
    filename=link.split("/")[-1]
    print "downloading ... " + filename
    u=urllib2.urlopen(link)
    p=u.read()
    open(filename,"w").write(p)
[/code]

$ ~/python/downloadjuniper.py
link www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib-jnx-user-aaa.txt
downloading ... mib-jnx-user-aaa.txt
Traceback (most recent call last):
  File "/home/powah/python/downloadjuniper.py", line 20, in ?
    u=urllib2.urlopen(link)
  File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
    return _opener.open(url, data)
  File "/usr/lib/python2.4/urllib2.py", line 350, in open
    protocol = req.get_type()
  File "/usr/lib/python2.4/urllib2.py", line 233, in get_type
    raise ValueError, "unknown url type: %s" % self.__original
ValueError: unknown url type:
www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib-jnx-user-aaa.txt



$ python
Python 2.4.4 (#1, Oct 23 2006, 13:58:00)
[GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

My computer is FC6 linux.


From kyrie at uh.cu  Wed May 27 12:35:09 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 27 May 2009 12:35:09 -0400
Subject: Python Socket Issues with VirtualBox
In-Reply-To: <1m9rekec3z2d3$.1j7hcy0d7aaei$.dlg@40tude.net>
References: <45133930-0502-44fb-9d9b-83d22159e6f0@u9g2000pre.googlegroups.com>
	<1m9rekec3z2d3$.1j7hcy0d7aaei$.dlg@40tude.net>
Message-ID: <200905271235.09702.kyrie@uh.cu>

On Friday 22 May 2009 11:05:42 am Alan Franzoni wrote:
> TechieInsights was kind enough to say:
[...]
> My first guess would be that you didn't specify the interface to bind to,
> and the interface order changes once you install virtualbox since it
> possibly adds a virtual interface of its own, 
[...]

And there is another possible cause: by default, virtualbox networking uses 
nat. The virtual machine sees both a local interface with a private IP, and 
a "router". The host, however, sees none, making it impossible to connect 
_to_ the virtual machine, or to open a listening socket in the "router"'s IP.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From akraemer at sbcglobal.net  Wed May 27 12:42:55 2009
From: akraemer at sbcglobal.net (Andreas Kraemer)
Date: Wed, 27 May 2009 09:42:55 -0700 (PDT)
Subject: print stream behavior
Message-ID: <d73e7eae-42a6-4154-b965-bc3239d3243c@y10g2000prc.googlegroups.com>

I don't understand the behavior of the print statement when streaming
to a "file-like" object. From the documentation at
http://www.python.org/doc/2.4.4/ref/print.html I understand that the
file-like object needs to have a write() method that - I assume - is
called when the print statement is invoked. However, the piece of code
below does not behave as I expect.

F subclasses file and overwrites its write() method (simply printing
out a message and then calling the superclass's write()). Calling
write directly works as expected, using print does not.

Can anybody shed some light on what's happening under the hood (or how
to make it work with "print")?

Thanks,
Andreas

Python 2.4.2 (#1, Jan 10 2008, 17:43:47)
[GCC 4.1.2 20070115 (prerelease) (SUSE Linux)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class F(file):
...   def write(self,str):
...     print 'writing to %s: %s' % (self.name,str)
...     file.write(self,str)
...
>>> f = F('test.txt','w')
>>> f.write('hallo')
writing to test.txt: hallo
>>> print >>f, 'good bye'
>>>

$ cat test.txt
hallogood bye



From kyrie at uh.cu  Wed May 27 13:00:08 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 27 May 2009 13:00:08 -0400
Subject: How to create a list of functions depending on a parameter?
In-Reply-To: <87fxes6xy9.fsf@rudin.co.uk>
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
	<87fxes6xy9.fsf@rudin.co.uk>
Message-ID: <200905271300.09076.kyrie@uh.cu>

On Tuesday 26 May 2009 05:00:14 am Paul Rudin wrote:
>
> class Foo(object):
>
>     def __init__(self, pos):
>         self.pos = pos
>
>     def __call__(self, arg):
>         return self.pos + arg
>
> f = [Foo(x) for x in range(10)]

Or, without the class:

In [1]: def get_incrementor(n):
   ...:     def inc(x):
   ...:         return x+n
   ...:     return inc
   ...:

In [3]: fs = [get_incrementor(n) for n in xrange(10)]

In [4]: fs[2](1)
Out[4]: 3




-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From clp2 at rebertia.com  Wed May 27 13:33:33 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 27 May 2009 10:33:33 -0700
Subject: download all mib files from a web page
In-Reply-To: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
Message-ID: <50697b2c0905271033l302021ebm736db95b5b15d339@mail.gmail.com>

On Wed, May 27, 2009 at 9:29 AM, powah <wong_powah at yahoo.ca> wrote:
> I want to download all mib files from the web page:
> http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19
>
> All mib filenames are of this format:
> www.juniper.net/techpubs ... .txt
>
> I write this program but has the following error.
> Please help.
> Thanks.
>
> [code]
> #!/usr/bin/env python
> import urllib2,os,urlparse
> url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
> net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
> page=urllib2.urlopen(url)
> f=0
> links=[]
> data=page.read().split("\n")
> for item in data:
> ? ?if "www.juniper.net/techpubs" in item:
> ? ? ? ?httpind=item.index("www.juniper.net/techpubs")
> ? ? ? ?item=item[httpind:]
> ? ? ? ?#print "item " + item
> ? ? ? ?ind=item.index("<")
> ? ? ? ?links.append(item[:ind]) #grab all links
> # download all links
> for link in links:
> ? ?print "link " + link
> ? ?filename=link.split("/")[-1]
> ? ?print "downloading ... " + filename
> ? ?u=urllib2.urlopen(link)
> ? ?p=u.read()
> ? ?open(filename,"w").write(p)
> [/code]
>
> $ ~/python/downloadjuniper.py
> link www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib-jnx-user-aaa.txt
> downloading ... mib-jnx-user-aaa.txt
> Traceback (most recent call last):
> ?File "/home/powah/python/downloadjuniper.py", line 20, in ?
> ? ?u=urllib2.urlopen(link)
> ?File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
> ? ?return _opener.open(url, data)
> ?File "/usr/lib/python2.4/urllib2.py", line 350, in open
> ? ?protocol = req.get_type()
> ?File "/usr/lib/python2.4/urllib2.py", line 233, in get_type
> ? ?raise ValueError, "unknown url type: %s" % self.__original
> ValueError: unknown url type:
> www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib-jnx-user-aaa.txt

You need to ensure that all URL strings include the protocol to use,
i.e. "http://"

Cheers,
Chris
-- 
http://blog.rebertia.com


From Colin.Hankins at touit.com  Wed May 27 13:36:09 2009
From: Colin.Hankins at touit.com (Colin.Hankins at touit.com)
Date: Wed, 27 May 2009 10:36:09 -0700 (PDT)
Subject: List reference at offset
Message-ID: <f9bb0329-48ca-4e9e-a20e-4cda1c1e5c91@o5g2000prh.googlegroups.com>

Disclaimer: I'm learning python and would like to use it in a
project.

The project will have many large matricies. In one particular instance
I need to reference a smaller submatrix of the larger matrix. I don't
want to create a new copy or even change any of the values, I just
want to quickly and easily be able to look at this sub matrix.

So I am using lists of lists for the matricies (I am also playing with
NumPy) and is there anyway to create a pointer to an offset in a
list?

I know you can have A = B = [] which would be the same.

And I know I can simply do a B[x + offset to submatrix].

But I was hoping there may be a way to just have a pointer? Or is
there another more efficient method to do this in python?

Thanks!


From mtw at protomagic.com  Wed May 27 13:47:19 2009
From: mtw at protomagic.com (Michael Werner)
Date: Wed, 27 May 2009 13:47:19 -0400
Subject: Announce: pcp-0.1
Message-ID: <D6E17AD7-10A8-4960-8AAB-040444E8179E@protomagic.com>


Name:        pcp-0.1
Description: Python Interface to SGI's Performance Co-Pilot client API
License:     GNU LGPL
Download:    ftp://oss.sgi.com/www/projects/pcp/download/python- 
pcp-0.1.tar.gz
Web:         http://oss.sgi.com/projects/pcp/

Author:      Michael Werner
Email:       mtw at protomagic dot com


Description of this Python Extension
-----------------------------

This python extension, called pcp, provides an interface to the  
client C API
for SGI's open source Performance Co-Pilot. This is a very early  
release and
some core functionality is missing, namely reading and writing  
archive files.
A set of convenience classes is provided, which build upon the base
functionality of SGI's library. These convenience classes may change in
future releases, as use-cases evolve and feedback suggests. A sample  
program
is included.


Description of SGI's Performance Co-Pilot
-----------------------------

Performance Co-Pilot is a distributed mechanism for measuring and  
recording
the performance and activity of computers, networks, applications, and
servers. PCP also includes an inference engine that can trigger  
responses
to measured conditions or events.  Several hundred different operational
parameters can be measured from target machines, their operating  
systems,
MySQL, Apache, Sendmail, VMWare, KVM, etc. There is a server-side  
library
available for writing additional plug-in modules to measure any  
custom target
application or server. There is a client-side library for writing custom
applications to collect and utilize measurements. This python  
extension wraps
that client-side C library, libpcp. Performance Co-Pilot is known to  
run on
Windows and many Unix/Linux variants.


Example Application
-----------------------------

To see an example prototype application that uses these python  
extensions
to visualize system activity, visit ...
http://blenderartists.org/forum/showthread.php?t=157085


Python.org site URL
-----------------------------

<p><a href="http://oss.sgi.com/projects/pcp/">pcp 0.1</a> - Python
Interface to SGI's  Performance Co-Pilot client API (22-May-09)

-----------------------------



From jeff at jmcneil.net  Wed May 27 13:50:31 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Wed, 27 May 2009 10:50:31 -0700 (PDT)
Subject: download all mib files from a web page
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
Message-ID: <82e5df8f-8ff2-4a33-9729-38ff8d777c23@b1g2000vbc.googlegroups.com>

On May 27, 12:29?pm, powah <wong_po... at yahoo.ca> wrote:
> I want to download all mib files from the web page:http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-m...
>
> All mib filenames are of this format:www.juniper.net/techpubs... .txt
>
> I write this program but has the following error.
> Please help.
> Thanks.
>
> [code]
> #!/usr/bin/env python
> import urllib2,os,urlparse
> url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
> net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
> page=urllib2.urlopen(url)
> f=0
> links=[]
> data=page.read().split("\n")
> for item in data:
> ? ? if "www.juniper.net/techpubs" in item:
> ? ? ? ? httpind=item.index("www.juniper.net/techpubs")
> ? ? ? ? item=item[httpind:]
> ? ? ? ? #print "item " + item
> ? ? ? ? ind=item.index("<")
> ? ? ? ? links.append(item[:ind]) #grab all links
> # download all links
> for link in links:
> ? ? print "link " + link
> ? ? filename=link.split("/")[-1]
> ? ? print "downloading ... " + filename
> ? ? u=urllib2.urlopen(link)
> ? ? p=u.read()
> ? ? open(filename,"w").write(p)
> [/code]
>
> $ ~/python/downloadjuniper.py
> linkwww.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
> downloading ... mib-jnx-user-aaa.txt
> Traceback (most recent call last):
> ? File "/home/powah/python/downloadjuniper.py", line 20, in ?
> ? ? u=urllib2.urlopen(link)
> ? File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
> ? ? return _opener.open(url, data)
> ? File "/usr/lib/python2.4/urllib2.py", line 350, in open
> ? ? protocol = req.get_type()
> ? File "/usr/lib/python2.4/urllib2.py", line 233, in get_type
> ? ? raise ValueError, "unknown url type: %s" % self.__original
> ValueError: unknown url type:www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
>
> $ python
> Python 2.4.4 (#1, Oct 23 2006, 13:58:00)
> [GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>
>
>
> My computer is FC6 linux.

There's only a couple dozen of them, right-click->Save As. I'm sure
Juniper would appreciate that much more than an automated crawler.

As far as your ValueError is concerned, consider that
'www.juniper.com' doesn't start with a protocol specification when
passed into urllib2.urlopen.

-Jeff
mcjeff.blogspot.com



From __peter__ at web.de  Wed May 27 13:52:25 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 27 May 2009 19:52:25 +0200
Subject: print stream behavior
References: <d73e7eae-42a6-4154-b965-bc3239d3243c@y10g2000prc.googlegroups.com>
Message-ID: <gvjujq$uev$03$1@news.t-online.com>

Andreas Kraemer wrote:

> I don't understand the behavior of the print statement when streaming
> to a "file-like" object. From the documentation at
> http://www.python.org/doc/2.4.4/ref/print.html I understand that the
> file-like object needs to have a write() method that - I assume - is
> called when the print statement is invoked. However, the piece of code
> below does not behave as I expect.
> 
> F subclasses file and overwrites its write() method (simply printing
> out a message and then calling the superclass's write()). Calling
> write directly works as expected, using print does not.
> 
> Can anybody shed some light on what's happening under the hood (or how
> to make it work with "print")?

This is a longstanding quirk of the CPython implementation. The 
PRINT_ITEM_TO opcode triggers a PyFile_WriteObject() call which in turn does 
the C equivalent of

if isinstance(f, file):
   file.write(f, s)
else:
   write = getattr(f, "write")
   write(s)
 
Therefore subclasses of file will always use file.write() when invoked via 
'print'.

You can avoid that by writing a wrapper instead of a subclass:

class File(object):
    def __init__(self, *args):
        self._file = open(*args)
    def write(self, s):
        self._file.write(s)
    # add other methods as needed

Peter



From randall at tnr.cc  Wed May 27 13:57:29 2009
From: randall at tnr.cc (Randall Smith)
Date: Wed, 27 May 2009 12:57:29 -0500
Subject: multiprocessing / forking memory usage
In-Reply-To: <m2octf5zya.fsf@cs.uu.nl>
References: <mailman.771.1243360355.8015.python-list@python.org>
	<m2octf5zya.fsf@cs.uu.nl>
Message-ID: <gvjuu9$niv$1@ger.gmane.org>

Thanks Piet.  You gave a good explanation and I think I understand much 
better now.

Piet van Oostrum wrote:
>>>>>> Randall Smith <randall at tnr.cc> (RS) wrote:
> 
>> RS> I'm trying to get a grasp on how memory usage is affected when forking as
>> RS> the multiprocessing module does.  I've got a program with a parent process
>> RS> using wx and other memory intensive modules. It spawns child processes (by
>> RS> forking) that should be very lean (no wx required, etc). Based on
>> RS> inspection using "ps v" and psutil, the memory usage (rss) is much higher
>> RS> than I would expect for the subprocess.
> 
> The child is a clone of the parent. So both its virtual memory usage and
> its resident memory usage will be equal to the parent's ones immediately
> after the fork(). But the actual physical memory has only one copy
> resident, although ps will show it on both processes (at least I think
> that's how ps works). Of course later they will diverge.
> 
>> RS> My understanding is that COW is used when forking (on Linux).  
> 
> I think this is true of all modern Unix systems.
> 
>> RS> So maybe "ps v pid" is reflecting that. If that's the case, is
>> RS> there a way to better determine the child's memory usage?
>  
> Define `memory usage' in the light of the above.
> 
> As long as the parent is still around and you don't run out of virtual
> memory in the child, not much harm is done.
> 
> If the parent stops and you don't run out of virtual memory in the
> child, the excessive pages will eventually be paged out, and then no
> longer occupy physical memory. As long as you have enough swap space it
> shouldn't be a big problem. The extra paging activity is a bit of a
> loss, however.
> 
> If you run out of virtual memory in the child you have a problem, however.
> 
>> RS> If it's not the case and I'm using
>> RS> modules I don't need, how can I reduce the memory usage to what the child
>> RS> actually uses instead of including everything the parent is using?
> 
> The best would be to fork the child before you import the excess modules
> in the parent. If that is not possible you could try to delete as much
> in the child as you can, for example by
> del wx; del sys.modules['wx'] etc, delete all variables that you don't
> need, and hope the garbage collector will clean up enough. But it will
> make you application quite complicated. From the python level you can't
> get rid of loaded shared libraries, however. And trying to do that from
> the C level is probably close to committing suicide.
> 
> My advise: don't worry until you really experience memory problems.



From akraemer at sbcglobal.net  Wed May 27 14:02:55 2009
From: akraemer at sbcglobal.net (Andreas Kraemer)
Date: Wed, 27 May 2009 11:02:55 -0700 (PDT)
Subject: print stream behavior
References: <d73e7eae-42a6-4154-b965-bc3239d3243c@y10g2000prc.googlegroups.com>
	<gvjujq$uev$03$1@news.t-online.com>
Message-ID: <2e8fc392-c253-490d-b62c-cf060355afc4@d25g2000prn.googlegroups.com>

On May 27, 10:52?am, Peter Otten <__pete... at web.de> wrote:
> This is a longstanding quirk of the CPython implementation. The
> PRINT_ITEM_TO opcode triggers a PyFile_WriteObject() call which in turn does
> the C equivalent of
>
> if isinstance(f, file):
> ? ?file.write(f, s)
> else:
> ? ?write = getattr(f, "write")
> ? ?write(s)
>
> Therefore subclasses of file will always use file.write() when invoked via
> 'print'.
>
> You can avoid that by writing a wrapper instead of a subclass:
>
> class File(object):
> ? ? def __init__(self, *args):
> ? ? ? ? self._file = open(*args)
> ? ? def write(self, s):
> ? ? ? ? self._file.write(s)
> ? ? # add other methods as needed
>
> Peter

Thanks very much! That solves the mystery ...


From wong_powah at yahoo.ca  Wed May 27 14:06:05 2009
From: wong_powah at yahoo.ca (powah)
Date: Wed, 27 May 2009 11:06:05 -0700 (PDT)
Subject: download all mib files from a web page
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
	<82e5df8f-8ff2-4a33-9729-38ff8d777c23@b1g2000vbc.googlegroups.com>
Message-ID: <c6572593-16c8-4198-a340-99ff14a0ad2b@i6g2000yqj.googlegroups.com>

On May 27, 1:50?pm, Jeff McNeil <j... at jmcneil.net> wrote:
> On May 27, 12:29?pm, powah <wong_po... at yahoo.ca> wrote:
>
>
>
>
>
> > I want to download all mib files from the web page:http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-m...
>
> > All mib filenames are of this format:www.juniper.net/techpubs... .txt
>
> > I write this program but has the following error.
> > Please help.
> > Thanks.
>
> > [code]
> > #!/usr/bin/env python
> > import urllib2,os,urlparse
> > url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
> > net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
> > page=urllib2.urlopen(url)
> > f=0
> > links=[]
> > data=page.read().split("\n")
> > for item in data:
> > ? ? if "www.juniper.net/techpubs" in item:
> > ? ? ? ? httpind=item.index("www.juniper.net/techpubs")
> > ? ? ? ? item=item[httpind:]
> > ? ? ? ? #print "item " + item
> > ? ? ? ? ind=item.index("<")
> > ? ? ? ? links.append(item[:ind]) #grab all links
> > # download all links
> > for link in links:
> > ? ? print "link " + link
> > ? ? filename=link.split("/")[-1]
> > ? ? print "downloading ... " + filename
> > ? ? u=urllib2.urlopen(link)
> > ? ? p=u.read()
> > ? ? open(filename,"w").write(p)
> > [/code]
>
> > $ ~/python/downloadjuniper.py
> > linkwww.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
> > downloading ... mib-jnx-user-aaa.txt
> > Traceback (most recent call last):
> > ? File "/home/powah/python/downloadjuniper.py", line 20, in ?
> > ? ? u=urllib2.urlopen(link)
> > ? File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
> > ? ? return _opener.open(url, data)
> > ? File "/usr/lib/python2.4/urllib2.py", line 350, in open
> > ? ? protocol = req.get_type()
> > ? File "/usr/lib/python2.4/urllib2.py", line 233, in get_type
> > ? ? raise ValueError, "unknown url type: %s" % self.__original
> > ValueError: unknown url type:www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
>
> > $ python
> > Python 2.4.4 (#1, Oct 23 2006, 13:58:00)
> > [GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
> > Type "help", "copyright", "credits" or "license" for more information.
>
> > My computer is FC6 linux.
>
> There's only a couple dozen of them, right-click->Save As. I'm sure
> Juniper would appreciate that much more than an automated crawler.
>
> As far as your ValueError is concerned, consider that
> 'www.juniper.com'doesn't start with a protocol specification when
> passed into urllib2.urlopen.
>
> -Jeff
> mcjeff.blogspot.com

Juniper's web page is simple, I am learning python so as to download
files from more complex web page and do other things as well.


From wong_powah at yahoo.ca  Wed May 27 14:06:07 2009
From: wong_powah at yahoo.ca (powah)
Date: Wed, 27 May 2009 11:06:07 -0700 (PDT)
Subject: download all mib files from a web page
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
Message-ID: <ad31d28e-1472-4da6-b704-820435947191@y7g2000yqa.googlegroups.com>

On May 27, 12:29?pm, powah <wong_po... at yahoo.ca> wrote:
> I want to download all mib files from the web page:http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-m...
>
> All mib filenames are of this format:www.juniper.net/techpubs... .txt
>
> I write this program but has the following error.
> Please help.
> Thanks.
>
> [code]
> #!/usr/bin/env python
> import urllib2,os,urlparse
> url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
> net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
> page=urllib2.urlopen(url)
> f=0
> links=[]
> data=page.read().split("\n")
> for item in data:
> ? ? if "www.juniper.net/techpubs" in item:
> ? ? ? ? httpind=item.index("www.juniper.net/techpubs")
> ? ? ? ? item=item[httpind:]
> ? ? ? ? #print "item " + item
> ? ? ? ? ind=item.index("<")
> ? ? ? ? links.append(item[:ind]) #grab all links
> # download all links
> for link in links:
> ? ? print "link " + link
> ? ? filename=link.split("/")[-1]
> ? ? print "downloading ... " + filename
> ? ? u=urllib2.urlopen(link)
> ? ? p=u.read()
> ? ? open(filename,"w").write(p)
> [/code]
>
> $ ~/python/downloadjuniper.py
> linkwww.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
> downloading ... mib-jnx-user-aaa.txt
> Traceback (most recent call last):
> ? File "/home/powah/python/downloadjuniper.py", line 20, in ?
> ? ? u=urllib2.urlopen(link)
> ? File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
> ? ? return _opener.open(url, data)
> ? File "/usr/lib/python2.4/urllib2.py", line 350, in open
> ? ? protocol = req.get_type()
> ? File "/usr/lib/python2.4/urllib2.py", line 233, in get_type
> ? ? raise ValueError, "unknown url type: %s" % self.__original
> ValueError: unknown url type:www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
>
> $ python
> Python 2.4.4 (#1, Oct 23 2006, 13:58:00)
> [GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>
>
>
> My computer is FC6 linux.

I fixed one error, now if the filename is misspelled, how to ignore
the error and continue?
[code]
#!/usr/bin/env python
import urllib2,os,urlparse
url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
page=urllib2.urlopen(url)
f=0
links=[]
data=page.read().split("\n")
for item in data:
    if "www.juniper.net/techpubs" in item:
        httpind=item.index("www.juniper.net/techpubs")
        item=item[httpind:]
        #print "item " + item
        ind=item.index(".txt") + 4
        links.append(item[:ind]) #grab all links
# download all links
for link in links:
    filename=link.split("/")[-1]
    link = "http://" + link
    print "link " + link
    print "downloading ... " + filename
    u=urllib2.urlopen(link)
    p=u.read()
    open(filename,"w").write(p)
[/code]

$ ~/python/downloadjuniper_onepage.py
link http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib-jnx-virtual-chassis.txt
downloading ... mib-jnx-virtual-chassis.txt
Traceback (most recent call last):
  File "/home/powah/python/downloadjuniper_onepage.py", line 7, in ?
    u=urllib2.urlopen(link)
  File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
    return _opener.open(url, data)
  File "/usr/lib/python2.4/urllib2.py", line 364, in open
    response = meth(req, response)
  File "/usr/lib/python2.4/urllib2.py", line 471, in http_response
    response = self.parent.error(
  File "/usr/lib/python2.4/urllib2.py", line 402, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.4/urllib2.py", line 337, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.4/urllib2.py", line 480, in
http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
urllib2.HTTPError: HTTP Error 404: Not Found


From stef.mientki at gmail.com  Wed May 27 14:09:01 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Wed, 27 May 2009 20:09:01 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
Message-ID: <4A1D81BD.3090609@gmail.com>

John Yeung wrote:
> On May 26, 9:43 am, Mel <mwil... at the-wire.com> wrote:
>
>   
>>  SciTE
>> I like one big uncomplicated window, tabbed file panes,
>> syntax coloring and help with indentation.  There's
>> nothing to it I hate.  It would be nice if
>> customization were easier.
>>     
>
> This is a decent summary of SciTE, but I kind of marvel at how few
> people complain about its Python indentation.  (I'd like to think it's
> because anyone who edits Python code in SciTE has downloaded my patch,
> but I am confident that is not the case.)
>   
What's not correct about the Python indentation ?
Where can we find the patch ?

cheers,
Stef
> John
>   



From abolotnov at gmail.com  Wed May 27 14:16:54 2009
From: abolotnov at gmail.com (abolotnov)
Date: Wed, 27 May 2009 11:16:54 -0700 (PDT)
Subject: Building mySQL-python with python 2.6
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>
	<mailman.793.1243429122.8015.python-list@python.org>
	<9-6dnT0O5_7YxYDXnZ2dnUVZ_tti4p2d@pdx.net>
Message-ID: <103438d3-7fdb-4963-b2f1-41bcb41903f4@f19g2000yqh.googlegroups.com>

> You might be able to use mingw32 as well.

say I obtain and install "an alternative" compiler. how do I tell
python which one to use?

I am sorry for asking dumb questions. Can't find the answers in the
docs/mans.


From __peter__ at web.de  Wed May 27 14:19:19 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 27 May 2009 20:19:19 +0200
Subject: List reference at offset
References: <f9bb0329-48ca-4e9e-a20e-4cda1c1e5c91@o5g2000prh.googlegroups.com>
Message-ID: <gvk068$3ju$00$1@news.t-online.com>

Colin.Hankins at touit.com wrote:

> Disclaimer: I'm learning python and would like to use it in a
> project.
> 
> The project will have many large matricies. In one particular instance
> I need to reference a smaller submatrix of the larger matrix. I don't
> want to create a new copy or even change any of the values, I just
> want to quickly and easily be able to look at this sub matrix.
> 
> So I am using lists of lists for the matricies (I am also playing with
> NumPy) and is there anyway to create a pointer to an offset in a
> list?
> 
> I know you can have A = B = [] which would be the same.
> 
> And I know I can simply do a B[x + offset to submatrix].
> 
> But I was hoping there may be a way to just have a pointer? Or is
> there another more efficient method to do this in python?

What you describe is what numpy does:

"""
Therefore, a regular indexing expression on an ndarray can always produce an 
ndarray object without copying any data. This is sometimes referred to as 
the ?view? feature of array indexing, and one can see that it is enabled by 
the use of striding information in the underlying ndarray object. The 
greatest bene?t of this feature is that it allows indexing to be done
very rapidly and without exploding memory usage (because no copies of the 
data are made).
"""





From norseman at hughes.net  Wed May 27 14:29:52 2009
From: norseman at hughes.net (norseman)
Date: Wed, 27 May 2009 11:29:52 -0700
Subject: Python, Tkinter and popen problem
Message-ID: <4A1D86A0.9010104@hughes.net>


This was sent 5/19/09 and as yet has received no comments.
I'm resending just in case a new reader might have an answer.
==================================



I have come across a problem that, as I understand all documentation I
have found, should not exist.

Python version is 2.5.2, Tinker in that package.
Linux Slackware 10.2

I went to test os.popen and got mixed answers.

         1) IF  os.popen opens a command line or command window type
            THEN  the read and writes work as expected
         2) IF  os.popen opens a Tkinter contained python program
            THEN  the read is not consistant and write to it fails.

OK - #1 runs as expected on shell scripts and other programs that were
         written for the keyboard and redirectors only. (non GUI types)

      #2 popen sometimes connects to stdout OF the child and sometimes
         not and has never shown signs of connection to stdin OF child

The Tkinter usage has three (3) print statements. Two (2) never show up.
One does. The one that does is the exit notice.

In the 'child' program;  print, sys.stdout.write(string), and
os.write(stdout,string) all work for the one that does write back, but
none work for the two that do not. Don't get picky on the syntax, the
purpose is to get the message across. (Actual syntax was adjusted per 
documentation in each effort.)


The print statements are:
print "Notice of action"
print VariableHavingTextOfAction

print "Closing down\n"

Yes I tried adding the '\n' to the others - no change.

Same loop reads/prints FROM the child's stdout for all three prints.

All three work fine when Tkinter included program is run 'solo'.
Print statements show up in the text (command, whatever) window.
The entire Tkinter included program runs normally except for the I/O
linkage problem when using os.popen(.....  or Popen2.popen2 or ... then
only third print shows up in text window. Acts as if first two prints
were captured but never forwarded to screen.  If it was a case of not
sending until a system flush() took place then all three lines would
appear at the closing. Yes? That is NOT happening. Only closing notice 
appears.  With master having a print ":",returnVal to verify where the 
text screen notices come from - the final print FROM the child is 
verified as captured and printed from the master.

The child has a pause expecting a keystroke from the master immediately
following the print VariableH...   which apparently is never received. 
It is at this point the child hangs.


Again, it's a Python program running a Python program that uses Tkinter.


So what is going on and what can I do to get things running correctly?
I want the master to echo the child's print statements and the child get
the 'continue' character so it will.

Today is: 20090527
Versions noted above.

Steve


From nad at acm.org  Wed May 27 14:33:38 2009
From: nad at acm.org (Ned Deily)
Date: Wed, 27 May 2009 11:33:38 -0700
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<4A15EF9E.8070406@islandtraining.com>
	<gv4st8$11t$1@ger.gmane.org> <200905271107.21750.kyrie@uh.cu>
Message-ID: <nad-AFD440.11333827052009@news.gmane.org>

In article <200905271107.21750.kyrie at uh.cu>,
 Luis Zarrabeitia <kyrie at uh.cu> wrote:
> On Thursday 21 May 2009 08:50:48 pm R. David Murray wrote:
> > In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
> > point algorithm for Python so that the shortest repr that will round
> > trip correctly is what is used as the floating point repr....
> 
> Little question: what was the goal of such a change? (is there a pep for me 
> to 
> read?)

See discussion starting here:

http://article.gmane.org/gmane.comp.python.devel/103191/

-- 
 Ned Deily,
 nad at acm.org



From lists at cheimes.de  Wed May 27 14:52:51 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 27 May 2009 20:52:51 +0200
Subject: Building mySQL-python with python 2.6
In-Reply-To: <103438d3-7fdb-4963-b2f1-41bcb41903f4@f19g2000yqh.googlegroups.com>
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>	<mailman.793.1243429122.8015.python-list@python.org>	<9-6dnT0O5_7YxYDXnZ2dnUVZ_tti4p2d@pdx.net>
	<103438d3-7fdb-4963-b2f1-41bcb41903f4@f19g2000yqh.googlegroups.com>
Message-ID: <gvk263$2eo$1@ger.gmane.org>

abolotnov wrote:
> say I obtain and install "an alternative" compiler. how do I tell
> python which one to use?
> 
> I am sorry for asking dumb questions. Can't find the answers in the
> docs/mans.

http://docs.python.org/install/index.html#gnu-c-cygwin-mingw

Christian



From __peter__ at web.de  Wed May 27 14:56:20 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 27 May 2009 20:56:20 +0200
Subject: Python, Tkinter and popen problem
References: <mailman.803.1243448972.8015.python-list@python.org>
Message-ID: <gvk2br$6bg$03$1@news.t-online.com>

norseman wrote:

> This was sent 5/19/09 and as yet has received no comments.

> I'm resending just in case a new reader might have an answer.

If you had posted two tiny scripts demonstrating your problem instead of the 
longwinded explanation I might have tinkered.

Peter



From Colin.Hankins at touit.com  Wed May 27 15:02:30 2009
From: Colin.Hankins at touit.com (Colin.Hankins at touit.com)
Date: Wed, 27 May 2009 12:02:30 -0700 (PDT)
Subject: List reference at offset
References: <f9bb0329-48ca-4e9e-a20e-4cda1c1e5c91@o5g2000prh.googlegroups.com>
	<gvk068$3ju$00$1@news.t-online.com>
Message-ID: <3c3d3156-325c-4463-8b86-21d1cc4df60a@r31g2000prh.googlegroups.com>

On May 27, 11:19?am, Peter Otten <__pete... at web.de> wrote:
> Colin.Hank... at touit.com wrote:
> > Disclaimer: I'm learning python and would like to use it in a
> > project.
>
> > The project will have many large matricies. In one particular instance
> > I need to reference a smaller submatrix of the larger matrix. I don't
> > want to create a new copy or even change any of the values, I just
> > want to quickly and easily be able to look at this sub matrix.
>
> > So I am using lists of lists for the matricies (I am also playing with
> > NumPy) and is there anyway to create a pointer to an offset in a
> > list?
>
> > I know you can have A = B = [] which would be the same.
>
> > And I know I can simply do a B[x + offset to submatrix].
>
> > But I was hoping there may be a way to just have a pointer? Or is
> > there another more efficient method to do this in python?
>
> What you describe is what numpy does:
>
> """
> Therefore, a regular indexing expression on an ndarray can always produce an
> ndarray object without copying any data. This is sometimes referred to as
> the ?view? feature of array indexing, and one can see that it is enabled by
> the use of striding information in the underlying ndarray object. The
> greatest bene?t of this feature is that it allows indexing to be done
> very rapidly and without exploding memory usage (because no copies of the
> data are made).
> """- Hide quoted text -
>
> - Show quoted text -

Thank you. That certainly did the trick!


From piet at cs.uu.nl  Wed May 27 15:06:32 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 27 May 2009 21:06:32 +0200
Subject: Multiprocessing problem with producer/consumer
References: <87y6si99t2.fsf@tank.madk.org>
Message-ID: <m27i025ps7.fsf@cs.uu.nl>

>>>>> Wu Zhe <wu at madk.org> (WZ) wrote:

>WZ> I am writing a server program with one producer and multiple consumers,
>WZ> what confuses me is only the first task producer put into the queue gets
>WZ> consumed, after which tasks enqueued no longer get consumed, they remain
>WZ> in the queue forever.

>WZ> from multiprocessing import Process, Pool, Queue, cpu_count
>WZ> from http import httpserv

>WZ> def work(queue):
>WZ>     while True:
>WZ>         task = queue.get()
>WZ>         if task is None:
>WZ>             break
>WZ>         time.sleep(5)
>WZ>         print "task done:", task
>WZ>     queue.put(None)

>WZ> class Manager:
>WZ>     def __init__(self):
>WZ>         self.queue = Queue()
>WZ>         self.NUMBER_OF_PROCESSES = cpu_count()

>WZ>     def start(self):
>WZ>         self.workers = [Process(target=work, args=(self.queue,))
>WZ>                         for i in xrange(self.NUMBER_OF_PROCESSES)]
>WZ>         for w in self.workers
>WZ>             w.start()

>WZ>         httpserv(self.queue)

>WZ>     def reload(self):
>WZ>         print "RELOAD"

>WZ>     def stop(self):
>WZ>         self.queue.put(None)
>WZ>         for i in range(self.NUMBER_OF_PROCESS):
>WZ>             self.workers[i].join()
>WZ>         queue.close()

>WZ> Manager().start()

>WZ> The producer is a HTTP server which put a task in the queue once receive
>WZ> a request from the user. It seems that consumer processes are still
>WZ> blocked when there are new tasks in the queue, which is weird.

How do you know there are still tasks in the queue?

When I replace your httpserv(self.queue) with:

        for i in range(100):
            self.queue.put(i)
it just works. So it seems probable to me that the problem is in
httpserv. Maybe it stalls or maybe it puts a None in the queue? You
could debug by logging the puts in the queue.

>WZ> P.S. Another two questions not relating to the above, I am not sure if
>WZ> it's better to put HTTP server in its own process other than the main
>WZ> process, if yes how can I make the main process keep running before all
>WZ> children processes end. Second question, what's the best way to stop the
>WZ> HTTP server gracefully?

In don't think it is useful to put the HTTP server in its own process as
the Manager process has hardly anything to do. But if you do you can
make it wait by doing the join of the worker processes at the end,
instead of inside the stop().

Stopping the HTTP server: is it multithreaded? You can have a boolean
that indicates it should accept no new requests. Without more info about
the server it is hard to give a more detailed answer.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From clp2 at rebertia.com  Wed May 27 15:11:55 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 27 May 2009 12:11:55 -0700
Subject: download all mib files from a web page
In-Reply-To: <ad31d28e-1472-4da6-b704-820435947191@y7g2000yqa.googlegroups.com>
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
	<ad31d28e-1472-4da6-b704-820435947191@y7g2000yqa.googlegroups.com>
Message-ID: <50697b2c0905271211i641c09absdddcd5c0bc9db121@mail.gmail.com>

On Wed, May 27, 2009 at 11:06 AM, powah <wong_powah at yahoo.ca> wrote:
> On May 27, 12:29?pm, powah <wong_po... at yahoo.ca> wrote:
>> I want to download all mib files from the web page:http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-m...
>>
>> All mib filenames are of this format:www.juniper.net/techpubs... .txt
>>
>> I write this program but has the following error.
>> Please help.
>> Thanks.
>>
>> [code]
>> #!/usr/bin/env python
>> import urllib2,os,urlparse
>> url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
>> net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
>> page=urllib2.urlopen(url)
>> f=0
>> links=[]
>> data=page.read().split("\n")
>> for item in data:
>> ? ? if "www.juniper.net/techpubs" in item:
>> ? ? ? ? httpind=item.index("www.juniper.net/techpubs")
>> ? ? ? ? item=item[httpind:]
>> ? ? ? ? #print "item " + item
>> ? ? ? ? ind=item.index("<")
>> ? ? ? ? links.append(item[:ind]) #grab all links
>> # download all links
>> for link in links:
>> ? ? print "link " + link
>> ? ? filename=link.split("/")[-1]
>> ? ? print "downloading ... " + filename
>> ? ? u=urllib2.urlopen(link)
>> ? ? p=u.read()
>> ? ? open(filename,"w").write(p)
>> [/code]
>>
>> $ ~/python/downloadjuniper.py
>> linkwww.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
>> downloading ... mib-jnx-user-aaa.txt
>> Traceback (most recent call last):
>> ? File "/home/powah/python/downloadjuniper.py", line 20, in ?
>> ? ? u=urllib2.urlopen(link)
>> ? File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
>> ? ? return _opener.open(url, data)
>> ? File "/usr/lib/python2.4/urllib2.py", line 350, in open
>> ? ? protocol = req.get_type()
>> ? File "/usr/lib/python2.4/urllib2.py", line 233, in get_type
>> ? ? raise ValueError, "unknown url type: %s" % self.__original
>> ValueError: unknown url type:www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
>>
>> $ python
>> Python 2.4.4 (#1, Oct 23 2006, 13:58:00)
>> [GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>>
>>
>>
>> My computer is FC6 linux.
>
> I fixed one error, now if the filename is misspelled, how to ignore
> the error and continue?

Read the fine tutorial: http://docs.python.org/tutorial/errors.html

Cheers,
Chris
-- 
http://blog.rebertia.com


From Scott.Daniels at Acm.Org  Wed May 27 15:37:05 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 27 May 2009 12:37:05 -0700
Subject: download all mib files from a web page
In-Reply-To: <ad31d28e-1472-4da6-b704-820435947191@y7g2000yqa.googlegroups.com>
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
	<ad31d28e-1472-4da6-b704-820435947191@y7g2000yqa.googlegroups.com>
Message-ID: <Lo2dnbn72r-YCIDXnZ2dnUVZ_rmdnZ2d@pdx.net>

powah wrote:
> ...
> I fixed one error, now if the filename is misspelled, how to ignore
> the error and continue?

You really should go through the tutorial.  It will explain this and
other important things well.  But, since I'm feeling generous:

Replace this:
>     u=urllib2.urlopen(link)
>     p=u.read()
>     open(filename,"w").write(p)
with this:
       try:
           u = urllib2.urlopen(link)
           p = u.read()
       except urllib2.HTTPError:
           pass
       else:
           dest = open(filename, "w")
           dest.write(p)
           dest.close()

--Scott David Daniels
Scott.Daniels at Acm.Org


From kyrie at uh.cu  Wed May 27 15:37:10 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 27 May 2009 15:37:10 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <nad-AFD440.11333827052009@news.gmane.org>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<200905271107.21750.kyrie@uh.cu>
	<nad-AFD440.11333827052009@news.gmane.org>
Message-ID: <200905271537.10336.kyrie@uh.cu>

On Wednesday 27 May 2009 02:33:38 pm Ned Deily wrote:
> In article <200905271107.21750.kyrie at uh.cu>,
>
> > Little question: what was the goal of such a change? (is there a pep for
> > me to
> > read?)
>
> See discussion starting here:
>
> http://article.gmane.org/gmane.comp.python.devel/103191/

Thank you.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From imageguy1206 at gmail.com  Wed May 27 15:58:27 2009
From: imageguy1206 at gmail.com (imageguy)
Date: Wed, 27 May 2009 12:58:27 -0700 (PDT)
Subject: Inheritance and Design Question
Message-ID: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>

I have an object the I would like to use as a base class.  Some of the
methods I would like to override completely, but others I would simply
like to call the base class method and use the return value in the
child method.  The purpose here is to eliminate the duplication of
valuable code in the parent, when I really just need the child to
operate of a results of the parent.

Consider the following two classes;

class Parent(object):
    def process(self, value):
        retval = "Parent.result('%s')" % value
        return retval

class Child(Parent):
    def __init__(self):
        Parent.__init__(self)

    def process(self, value):
        retval = "Child.result('%s')" % super(Child, self).process
(value)
        return retval

So ....

foo = Child()
print foo.process('the value')
>> Child.result('Parent.result('the value')')

IS there another pattern or idiom that would accomplish this?
This seems a bit 'smelly' to me.  Also seems almost the inverse of
decorators, but I am not sure decorators would be appropriate in this
case.

Any help suggestions would be appreciated.

g.


From dickinsm at gmail.com  Wed May 27 16:26:57 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: 27 May 2009 20:26:57 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<4A15EF9E.8070406@islandtraining.com> <gv4st8$11t$1@ger.gmane.org>
	<mailman.795.1243436849.8015.python-list@python.org>
Message-ID: <4a1da210$0$90265$14726298@news.sunsite.dk>

Luis Zarrabeitia <kyrie at uh.cu> wrote:
> On Thursday 21 May 2009 08:50:48 pm R. David Murray wrote:
> 
>> In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
>> point algorithm for Python so that the shortest repr that will round
>> trip correctly is what is used as the floating point repr....
> 
> Little question: what was the goal of such a change? (is there a pep for me to 
> read?) Shouldn't str() do that, and leave repr as is?

It's a good question.  I was prepared to write a PEP if necessary, but
there was essentially no opposition to this change either in the
python-dev thread that Ned already mentioned, in the bugs.python.org
feature request (see http://bugs.python.org/issue1580; set aside
half-an-hour or so if you want to read this one) or amongst the people
we spoke to at PyCon 2009, so in the end Eric and I just went ahead
and merged the changes.  It didn't harm that Guido supported the idea.

I think the main goal was to see fewer complaints from newbie users
about 0.1 displaying as 0.10000000000000001.  There's no real reason
to produce 17 digits here.  Neither 0.1 nor 0.10000000000000001
displays the true value of the float---both are approximations, so why
not pick the approximation that actually displays nicely.  The only
requirement is that float(repr(x)) recovers x exactly, and since 0.1
produced the float in the first place, it's clear that taking
repr(0.1) to be '0.1' satisfies this requirement.

The problem is particularly acute with the use of the round function,
where newbies complain that round is buggy because it's not rounding
to 2 decimal places:

>>> round(2.45311, 2)
2.4500000000000002

With the new float repr, the result of rounding a float to 2 decimal
places will always display with at most 2 places after the point.
(Well, possibly except when that float is very large.)

Of course, there are still going to be complaints that the following
is rounding in the wrong direction:

>>> round(0.075, 2)
0.07

I'll admit to feeling a bit uncomfortable about the fact that the new
repr goes a little bit further towards hiding floating-point
difficulties from numerically-naive users.

The main things that I like about the new representation is that its
definition is saner (give me the shortest string that rounds
correctly, versus format to 17 places and then somewhat arbitrarily
strip all trailing zeros) and it's more consistent than the old.  With
the current 2.6/3.0 repr (on my machine; your results may vary):

>>> 0.01
0.01
>>> 0.02
0.02
>>> 0.03
0.029999999999999999
>>> 0.04
0.040000000000000001

With Python 3.1:

>>> 0.01
0.01
>>> 0.02
0.02
>>> 0.03
0.03
>>> 0.04
0.04

A cynical response would be to say that the Python 2.6 repr lies only
some of the time; with Python 3.1 it lies *all* of the time.  But
actually all of the above outputs are lies; it's just that the second
set of lies is more consistent and better looking.

There are also a number of significant 'hidden' benefits to using
David Gay's code instead of the system C library's functions, though
those benefits are mostly independent of the choice to use the short
float repr:

- the float repr is much more likely to be consistent across platforms
  (or at least across those platforms using IEEE 754 doubles, which
   seems to be 99.9% percent of them)

- the C library double<->string conversion functions are buggy on many
  platforms (including at least OS X, Windows and some flavours of
  Linux).  While I won't claim that Gay's code (or our adaptation of
  it) is bug-free, I don't know of any bugs (reports welcome!) and at
  least when bugs are discovered it's within our power to fix them.
  Here's one example of an x == eval(repr(x)) failure due to a bug in
  the OS X implementation of strtod:

  >>> x = (2**52-1)*2.**(-1074)
  >>> x
  2.2250738585072009e-308
  >>> y = eval(repr(x))
  >>> y
  2.2250738585072014e-308
  >>> x == y
  False

- similar to the last point: on many platforms string formatting is
  not correctly rounded, in the sense that e.g. '%.6f' % x does not
  necessarily produce the closest decimal with 6 places after the
  decimal point to x.  This is *not* a platform bug, since there's no
  requirement of correct rounding in the C standards.  However, David
  Gay's code does provide correctly rounded string -> double and
  double -> string conversions, so Python's string formatting will now
  always be correctly rounded.  A small thing, but it's nice to have.

- since both round() and string formatting now both use Gay's code, we
  can finally guarantee that round and string formatting give
  equivalent results: e.g., that the digits in round(x, 2) are the
  same as the digits in '%.2f' % x.  That wasn't true before: round
  could round up while '%.2f' % x rounded down (or vice versa) leading
  to confusion and at least one semi-bogus bug report.

- a lot of internal cleanup has become possible as a result of not
  having to worry about all the crazy things that platform string <->
  double conversions can do.  This makes the CPython code smaller,
  clearer, easier to maintain, and less likely to contain bugs.

> While I agree that the change gets rid of the weekly newbie question 
> about "python's lack precision", I'd find more difficult to explain why
> 0.2 * 3 != 0.6 without showing them what 0.2 /really/ means.

There are still plenty of ways to show what 0.2 really means.  My
favourite is to use the Decimal.from_float method:

>>> Decimal.from_float(0.2)
Decimal('0.200000000000000011102230246251565404236316680908203125')

This is only available in 2.7 and 3.1, but then the repr change isn't
happening until 3.1 (and it almost certainly won't be backported to
2.7, by the way), so that's okay.  But there's also float.hex,
float.as_integer_ratio, and Fraction.from_float to show the exact
value that's stored for a float.

>>> 0.2.hex()
'0x1.999999999999ap-3'
>>> Fraction.from_float(0.2)
Fraction(3602879701896397, 18014398509481984)

Hmm.  That was a slightly unfortunate choice of example: the hex form
of 0.2 looks uncomfortably similar to 1.9999999....  An interesting
cross-base accident.

This is getting rather long.  Perhaps I should put the above comments
together into a 'post-PEP' document.

Mark


From Scott.Daniels at Acm.Org  Wed May 27 16:49:23 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 27 May 2009 13:49:23 -0700
Subject: Inheritance and Design Question
In-Reply-To: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
Message-ID: <6eadnbXBDNhqOIDXnZ2dnUVZ_g-dnZ2d@pdx.net>

imageguy wrote:
> I have an object the I would like to use as a base class.  Some of the
> methods I would like to override completely, but others I would simply
> like to call the base class method and use the return value in the
> child method.  The purpose here is to eliminate the duplication of
> valuable code in the parent, when I really just need the child to
> operate of a results of the parent.
> 
> Consider the following two classes;
> 
> class Parent(object):
>     def process(self, value):
>         retval = "Parent.result('%s')" % value
>         return retval
> 
> class Child(Parent):
>     def __init__(self):
>         Parent.__init__(self)
> 
>     def process(self, value):
>         retval = "Child.result('%s')" % super(Child, self).process
> (value)
>         return retval
> 
> So ....
> 
> foo = Child()
> print foo.process('the value')
>>> Child.result('Parent.result('the value')')
> 
> IS there another pattern or idiom that would accomplish this?
> This seems a bit 'smelly' to me.  Also seems almost the inverse of
> decorators, but I am not sure decorators would be appropriate in this
> case.
> 
> Any help suggestions would be appreciated.
> 
> g.
Just don't replace the methods you want to use from the superclass
-- it really is that simple.  Notice how str is changed below,
but not repr:

     class GroupedInt(int):
         def __str__(self):
             old = super(GroupedInt, self).__str__()
             first = old[: len(old) % 3 or 3]
             if first == '-':
                 first = old[: 4]
             parts = [first]
             parts.extend(old[n : n + 3] for n in
                               range(len(first), len(old), 3))
             return '_'.join(parts)

     for n in 1, 12, 123, 1234, 12345, 123456, 1234567:
	print '%s\t%s=%r\t%s=%r' % (n, GroupedInt(n),  GroupedInt(n),
                                        GroupedInt(-n), GroupedInt(-n))

1	1=1	-1=-1
12	12=12	-12=-12
123	123=123	-123=-123
1234	1_234=1234	-1_234=-1234
12345	12_345=12345	-12_345=-12345
123456	123_456=123456	-123_456=-123456
1234567	1_234_567=1234567	-1_234_567=-1234567

--Scott David Daniels
Scott.Daniels at Acm.Org


From mccredie at gmail.com  Wed May 27 16:59:33 2009
From: mccredie at gmail.com (Matimus)
Date: Wed, 27 May 2009 13:59:33 -0700 (PDT)
Subject: Inheritance and Design Question
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
Message-ID: <ba35dd51-aff7-4079-9f0e-dc67463ac5a4@f37g2000pro.googlegroups.com>

On May 27, 12:58?pm, imageguy <imageguy1... at gmail.com> wrote:
> I have an object the I would like to use as a base class. ?Some of the
> methods I would like to override completely, but others I would simply
> like to call the base class method and use the return value in the
> child method. ?The purpose here is to eliminate the duplication of
> valuable code in the parent, when I really just need the child to
> operate of a results of the parent.
>
> Consider the following two classes;
>
> class Parent(object):
> ? ? def process(self, value):
> ? ? ? ? retval = "Parent.result('%s')" % value
> ? ? ? ? return retval
>
> class Child(Parent):
> ? ? def __init__(self):
> ? ? ? ? Parent.__init__(self)
>
> ? ? def process(self, value):
> ? ? ? ? retval = "Child.result('%s')" % super(Child, self).process
> (value)
> ? ? ? ? return retval
>
> So ....
>
> foo = Child()
> print foo.process('the value')
>
> >> Child.result('Parent.result('the value')')
>
> IS there another pattern or idiom that would accomplish this?
> This seems a bit 'smelly' to me. ?Also seems almost the inverse of
> decorators, but I am not sure decorators would be appropriate in this
> case.
>
> Any help suggestions would be appreciated.
>
> g.

>From what you have shown, there really is no _good_ reason to use
inheritance at all. Just delegate (which is the decorator pattern,
different from function decorators).

class Inner(object):
    def process(self, value):
        retval = "Parent.result('%s')" % value
        return retval

class Outer(object):
    def __init__(self, inner):
        self._inner = inner

    def process(self, value):
        retval = "Outer.result('%s')" % self._inner.process(value)
        return retval

This is a silly example, but if you can get the same thing done
without creating a direct dependence between classes then don't. You
will have to construct outer and pass it inner somewhere. If that is a
problem, then just make a factory. In python I implement factories as
just functions most of the time.

The above also encourages reuse. Now you have a decorator that could
be used anywhere.

Matt


From tjreedy at udel.edu  Wed May 27 17:21:23 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 27 May 2009 17:21:23 -0400
Subject: Inheritance and Design Question
In-Reply-To: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
Message-ID: <gvkask$v6$1@ger.gmane.org>

imageguy wrote:
> I have an object the I would like to use as a base class.  Some of the
> methods I would like to override completely, but others I would simply
> like to call the base class method and use the return value in the
> child method.  The purpose here is to eliminate the duplication of
> valuable code in the parent, when I really just need the child to
> operate of a results of the parent.
> 
> Consider the following two classes;
> 
> class Parent(object):
>     def process(self, value):
>         retval = "Parent.result('%s')" % value
>         return retval
> 
> class Child(Parent):
>     def __init__(self):
>         Parent.__init__(self)

Delete this and the parent __init__ is called directly.
> 
>     def process(self, value):
>         retval = "Child.result('%s')" % super(Child, self).process
> (value)
>         return retval

super() was designed for multiple inheritance.  The only reason I know 
to use it with single inheritance it to save a 
global-search-and-replace_with_confirmation if you change the name of 
the parent or change parents.  Unless I really anticipated such 
contigencies, I would probably write Parent.process(self, value).

tjr



From kyrie at uh.cu  Wed May 27 17:24:59 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 27 May 2009 17:24:59 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <4a1da210$0$90265$14726298@news.sunsite.dk>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.795.1243436849.8015.python-list@python.org>
	<4a1da210$0$90265$14726298@news.sunsite.dk>
Message-ID: <200905271725.00185.kyrie@uh.cu>

On Wednesday 27 May 2009 04:26:57 pm Mark Dickinson wrote:
> Luis Zarrabeitia <kyrie at uh.cu> wrote:
> > On Thursday 21 May 2009 08:50:48 pm R. David Murray wrote:
> >> In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
> >> point algorithm for Python so that the shortest repr that will round
> >> trip correctly is what is used as the floating point repr....
> >
> > Little question: what was the goal of such a change? (is there a pep for
> > me to read?) Shouldn't str() do that, and leave repr as is?
>
> It's a good question.  I was prepared to write a PEP if necessary, but
> there was essentially no opposition to this change either in the
> python-dev thread that Ned already mentioned, in the bugs.python.org
> feature request (see http://bugs.python.org/issue1580; set aside
> half-an-hour or so if you want to read this one) or amongst the people
> we spoke to at PyCon 2009, so in the end Eric and I just went ahead
> and merged the changes.  It didn't harm that Guido supported the idea.

Thank you for the reply and the explanation.
After reading the thread, I was sold on the idea. It still feels weird not 
being able to introduce /that quickly/ the idea of float vs real to newbies, 
but now I understand the tradeoff. 

(Now, I'm going to miss showing that to my students who almost inevitably 
complain about the uselessness of the 'floating point representation' chapter 
in the numerical analysis course :D).

> There are still plenty of ways to show what 0.2 really means.  My
>
> favourite is to use the Decimal.from_float method:
> >>> Decimal.from_float(0.2)
>
> Decimal('0.200000000000000011102230246251565404236316680908203125')

Oh, thank you. That was the next thing I was going to ask.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From descentspb at gmail.com  Wed May 27 17:25:44 2009
From: descentspb at gmail.com (Igor Katson)
Date: Thu, 28 May 2009 01:25:44 +0400
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <m2tz38n0m5.fsf@valheru.db3l.homeip.net>
References: <mailman.1830.1242879003.8014.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>	<4A157AF1.9020104@mrabarnett.plus.com>	<mailman.648.1243147960.8015.python-list@python.org>	<m2y6smm7lw.fsf@valheru.db3l.homeip.net>	<mailman.696.1243233822.8015.python-list@python.org>
	<m2tz38n0m5.fsf@valheru.db3l.homeip.net>
Message-ID: <4A1DAFD8.409@gmail.com>


>
> So in summary, the choices when tested on my system ended up at:
>
>     last             26
>     last-chunk        2.7
>     last-chunk-2      2.3
>     last-popen        1.7
>     last-gzip         1.48
>     last-decompress   1.12
>
> So by being willing to mix in some more direct code with the GzipFile
> object, I was able to beat the overhead of shelling out to the faster
> utilities, while remaining in pure Python.
>
> -- David
>   
Though I didn't need this practically, it was a fantastic reading. 
Gorgeus, David! Thanks for the ultimative post.


From rhodri at wildebst.demon.co.uk  Wed May 27 18:40:27 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 27 May 2009 23:40:27 +0100
Subject: What text editor is everyone using for Python
In-Reply-To: <4a1d628f$0$6471$426a74cc@news.free.fr>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
	<4a1d628f$0$6471$426a74cc@news.free.fr>
Message-ID: <op.uul09plha8ncjz@gnudebst>

On Wed, 27 May 2009 16:56:12 +0100, Bruno Desthuilliers  
<bruno.42.desthuilliers at websiteburo.invalid> wrote:

> Rhodri James a ?crit :
>> On Tue, 26 May 2009 14:22:29 +0100, Roy Smith <roy at panix.com> wrote:
>>
>>> My pet peeve is syntax-aware editors which get things wrong.  For  
>>> example,
>>> the version of emacs I'm using now doesn't parse this properly:
>>>
>>> '''A triple-quoted string.  Some editors won't get this right'''
>>>
>>> The solution is to change the outer quotes to double-quotes, but it  
>>> annoys me when I have to change my code to appease a tool.
>>  It's the separate python-mode that gets this (and much else) wrong.
>> The Python mode that Ubuntu packages with emacs 22.2.1 works just
>> fine.
>
> On this point, indeed. But it also lacks almost every nice feature of  
> the One True python-mode (or at least did last time I had to update this  
> ... ubuntu box at work).

That rather depends on your definition of "nice".  The only feature of
python-mode.el that I miss in python.el is the ability to run pylint from
the menu, and I'll get over that.  The feature that caused me to uninstall
python-mode.el was its bloody-minded determination to regard '_' as a word
character, something which caused me more typing that it ever saved.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From Nikolaus at rath.org  Wed May 27 19:08:25 2009
From: Nikolaus at rath.org (Nikolaus Rath)
Date: Wed, 27 May 2009 19:08:25 -0400
Subject: [pyunit] Only run one specific test
Message-ID: <87k542dtzq.fsf@vostro.rath.org>

Hi,

Consider these two files:

,---- mytest.py -----
| #!/usr/bin/env python
| import unittest
| 
| class myTestCase(unittest.TestCase):
|     def test_foo(self):
| 	pass
| 
| # Somehow important according to pyunit documentation
| def suite():
|     return unittest.makeSuite(myTestCase)
`----

,---- runtest ---
| #!/usr/bin/env python
| import unittest
| 
| # Find and import tests
| modules_to_test =  [ "mytest" ]
| map(__import__, modules_to_test)
| 
| # Runs all tests in test/ directory
| def suite():
|     alltests = unittest.TestSuite()
|     for name in modules_to_test:
|         alltests.addTest(unittest.findTestCases(sys.modules[name]))
|     return alltests
| 
| if __name__ == '__main__':
|     unittest.main(defaultTest='suite')
`----


if I run runtest without arguments, it works. But according to runtest
--help, I should also be able to do

,----
| $ ./runtest mytest
| Traceback (most recent call last):
|   File "./runtest", line 20, in <module>
|     unittest.main()
|   File "/usr/lib/python2.6/unittest.py", line 816, in __init__
|     self.parseArgs(argv)
|   File "/usr/lib/python2.6/unittest.py", line 843, in parseArgs
|     self.createTests()
|   File "/usr/lib/python2.6/unittest.py", line 849, in createTests
|     self.module)
|   File "/usr/lib/python2.6/unittest.py", line 613, in loadTestsFromNames
|     suites = [self.loadTestsFromName(name, module) for name in names]
|   File "/usr/lib/python2.6/unittest.py", line 584, in loadTestsFromName
|     parent, obj = obj, getattr(obj, part)
| AttributeError: 'module' object has no attribute 'mytest'
`----


Why doesn't this work?

Best,

   -Nikolaus


-- 
 ?Time flies like an arrow, fruit flies like a Banana.?

  PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6  02CF A9AD B7F8 AE4E 425C


From norseman at hughes.net  Wed May 27 20:15:03 2009
From: norseman at hughes.net (norseman)
Date: Wed, 27 May 2009 17:15:03 -0700
Subject: Python, Tkinter and popen problem
In-Reply-To: <gvk2br$6bg$03$1@news.t-online.com>
References: <mailman.803.1243448972.8015.python-list@python.org>
	<gvk2br$6bg$03$1@news.t-online.com>
Message-ID: <4A1DD787.3080803@hughes.net>

Peter Otten wrote:
> norseman wrote:
> 
>> This was sent 5/19/09 and as yet has received no comments.
> 
>> I'm resending just in case a new reader might have an answer.
> 
> If you had posted two tiny scripts demonstrating your problem instead of the 
> longwinded explanation I might have tinkered.
> 
> Peter
> 
--------------------------

Since it got lost:
Python 2.5.2 with Tkinter in the download package
Linux Slackware 10.2

That's one of the problems - with Tkinter you don't get tiny files. :)

I have kept working on this and now have it to the point that sending TO 
the child w/Tkinter works.  Getting messages from the child now shows 
that the flush() is not taking place in timely fashion.  ALL print 
statements FROM child do now flush and are shown correctly, but only 
when the child terminates.

Question now is how to force a flush of stdout while the program is 
running with tkinter in use.

tkinter section is   print "string"
                 or   sys.stdout.write("string")
        sys.stdout.flush() fails totally
I don't care how it's flushed as long as it works on whatever machine 
python runs on.


NOTE: program runs perfectly on both Linux and Windows XP Pro when run 
from the keyboard. But not from another python program that wants the 
phone line connected. (stdin/stdout)  Gee... There is never a County 
Lineman when needed is there Glen? :)


Steve


From python at bdurham.com  Wed May 27 20:28:37 2009
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 27 May 2009 20:28:37 -0400
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <4A1DAFD8.409@gmail.com>
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
	<m2y6smm7lw.fsf@valheru.db3l.homeip.net>
	<mailman.696.1243233822.8015.python-list@python.org>
	<m2tz38n0m5.fsf@valheru.db3l.homeip.net> <4A1DAFD8.409@gmail.com>
Message-ID: <1243470517.9717.1317548479@webmail.messagingengine.com>

Dave,

Not the OP, but really enjoyed your analysis and solution. Excellent
job!!

Thank you!
Malcolm


From eric.pruitt at gmail.com  Wed May 27 20:39:21 2009
From: eric.pruitt at gmail.com (Eric Pruitt)
Date: Wed, 27 May 2009 19:39:21 -0500
Subject: Popen File I/O
Message-ID: <171e8a410905271739x90c85b5k87417d02c0b45357@mail.gmail.com>

Hello,

I am creating a file-like interface for Popen. Do I need to return True or
False for "isatty()"? I am thinking True but I am not familiar with the
semantics of what defines a tty.

Thanks,
Eric
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From google at mrabarnett.plus.com  Wed May 27 20:39:36 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 28 May 2009 01:39:36 +0100
Subject: Python, Tkinter and popen problem
In-Reply-To: <4A1DD787.3080803@hughes.net>
References: <mailman.803.1243448972.8015.python-list@python.org>	<gvk2br$6bg$03$1@news.t-online.com>
	<4A1DD787.3080803@hughes.net>
Message-ID: <4A1DDD48.6080303@mrabarnett.plus.com>

norseman wrote:
> Peter Otten wrote:
>> norseman wrote:
>>
>>> This was sent 5/19/09 and as yet has received no comments.
>>
>>> I'm resending just in case a new reader might have an answer.
>>
>> If you had posted two tiny scripts demonstrating your problem instead 
>> of the longwinded explanation I might have tinkered.
>>
>> Peter
>>
> --------------------------
> 
> Since it got lost:
> Python 2.5.2 with Tkinter in the download package
> Linux Slackware 10.2
> 
> That's one of the problems - with Tkinter you don't get tiny files. :)
> 
[snip]

You're more likely to get help if you provide the minimum code that
demonstrates the problem.

Anyway, your original post said that you're running the child with
os.popen. The documentation says:

"""Open a pipe to or from command. The return value is an open file
object connected to the pipe, which can be read or written depending on
whether mode is 'r' (default) or 'w'."""

In other words, it's one-way.

Are you really using os.popen and not, say, os.popen2?

(Providing actual code would make this clear.)


From darcy at druid.net  Wed May 27 20:53:16 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 27 May 2009 20:53:16 -0400
Subject: Popen File I/O
In-Reply-To: <171e8a410905271739x90c85b5k87417d02c0b45357@mail.gmail.com>
References: <171e8a410905271739x90c85b5k87417d02c0b45357@mail.gmail.com>
Message-ID: <20090527205316.a42b10c6.darcy@druid.net>

On Wed, 27 May 2009 19:39:21 -0500
Eric Pruitt <eric.pruitt at gmail.com> wrote:

> I am creating a file-like interface for Popen. Do I need to return True or
> False for "isatty()"? I am thinking True but I am not familiar with the
> semantics of what defines a tty.

>>> import os
>>> x = os.popen("ls")       
>>> type(x)
<type 'file'>
>>> x.isatty()
False

So what does "creating a file-like interface for Popen" entail?  Popen
already creates a file object.  As for your question, If the object is
reading from a TTY then isatty() is True.  What exactly is your
confusion?

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From thebiggestbangtheory at gmail.com  Wed May 27 21:10:22 2009
From: thebiggestbangtheory at gmail.com (thebiggestbangtheory at gmail.com)
Date: Wed, 27 May 2009 18:10:22 -0700 (PDT)
Subject: newbie: popen question
Message-ID: <328e5cd4-bc4e-47bf-b8e2-91764351c525@g22g2000pra.googlegroups.com>

hello everyone :-),
                         I am a newbie to python. I am trying to run a
bash script from within a python program. I would greatly appreciate
any pointers/comments about how to get around the problem I am facing.

I want to run  bash script: code.sh from within a python program.
code.sh needs to be run like so from the command line
[code]
$ sudo code.sh arg1 arg2
[/code]

I read up on some documentation but am not very clear about how to use
popen. I want to relegate the shell to a background process, but it
needs to accept the sudo passwd too!

I have tried
[code]
p = subprocess.Popen(['/bin/bash', 'sudo '+mypath+'code.sh '+arg1+'
'+arg2],
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.STDOUT)
[/code]
I tried some code from stackoverflow.com/questions/694000/why-doesnt-
subprocess-popen-always-return

nothing really happens when this executes, the PIPE option pshes it to
the background and I can't push in the sudo passwd. Can someone please
give me an idea of how to go about this.

To recap, I want to run a shell script, which needs to be started with
sudo, and then push it into the background.

Thanks,
-A


From ldo at geek-central.gen.new_zealand  Wed May 27 21:12:57 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 28 May 2009 13:12:57 +1200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
Message-ID: <gvkoep$oii$3@lust.ihug.co.nz>

In message <784h2cF1kem0kU1 at mid.uni-berlin.de>, Diez B. Roggisch wrote:

> Lawrence D'Oliveiro wrote:
> 
>> In message <mailman.766.1243354300.8015.python-list at python.org>, Dennis
>> Lee Bieber wrote:
>> 
>>> Notice that db.literal() call? That's part of the mechanism used to
>>> escape and quote parameters -- it only returns strings that are safe for
>>> insertion into the SQL statement.
>> 
>> Does it deal with "like"-wildcards?
> 
> Why shouldn't it?
> 
> cursor.execute("select * from table where column like %s", "%name%")

What if the string you're searching for includes a "%" or "_" character?



From gallium.arsenide at gmail.com  Wed May 27 21:41:51 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Wed, 27 May 2009 18:41:51 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
Message-ID: <ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>

On May 27, 2:09?pm, Stef Mientki <stef.mien... at gmail.com> wrote:

> John Yeung wrote:
>
> > I kind of marvel at how few people complain about [SciTE's]
> > Python indentation. ?(I'd like to think it's because anyone
> > who edits Python code in SciTE has downloaded my patch, but
> > I am confident that is not the case.)
>
> What's not correct about the Python indentation ?
> Where can we find the patch ?

If you have used SciTE for Python and haven't been frustrated by the
autoindentation, then I don't think there is much reason for you to
bother with a patch.  By autoindentation, I mean automatically adding
a level when a new block starts, not merely maintaining indentation
level (which virtually every editor does, and some even call this
their "autoindentation" feature).

The problem with SciTE's autoindentation for Python is that you can
only choose from the following three behaviors:

1.  Add a level if you press Enter on a line containing a "live" colon
(that is, one that's not in a string or comment).  [Try not to use
slices except on the same line as a block-initiating 'for', 'if',
etc.]

2.  Add a level if you press Enter on a line containing selected
keywords like 'if', 'for', 'while', 'def', etc.  [Avoid list
comprehensions and generator expressions.  You can do everything with
map, filter, and lambda, right?]

3.  Don't autoindent at all (maintain the current indentation only).

It boggles the mind that there is no way to tell SciTE "only pay
attention to the colon if it's at the end of the line" other than by
modifying the source code, but there you have it.  (It's not like
choice 3 is actually that bad.  I imagine that is what SciTE's author
uses for Python.)

My patch (which also fixes a couple of other indentation-related
things that were driving me crazy) is here:

  http://groups.google.com/group/scite-interest/files

in the file called Python_AutoIndent.cxx.

John


From sjmachin at lexicon.net  Wed May 27 21:48:12 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 27 May 2009 18:48:12 -0700 (PDT)
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org> 
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de> 
	<gvkoep$oii$3@lust.ihug.co.nz>
Message-ID: <0dcfcb4a-8844-420b-b2e2-c8e68419774d@p6g2000pre.googlegroups.com>

On May 28, 11:12?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <784h2cF1kem0... at mid.uni-berlin.de>, Diez B. Roggisch wrote:
>
> > Lawrence D'Oliveiro wrote:
>
> >> In message <mailman.766.1243354300.8015.python-l... at python.org>, Dennis
> >> Lee Bieber wrote:
>
> >>> Notice that db.literal() call? That's part of the mechanism used to
> >>> escape and quote parameters -- it only returns strings that are safe for
> >>> insertion into the SQL statement.
>
> >> Does it deal with "like"-wildcards?
>
> > Why shouldn't it?
>
> > cursor.execute("select * from table where column like %s", "%name%")
>
> What if the string you're searching for includes a "%" or "_" character?

AFAIK:
The LIKE argument is a just any ol' string expression.
The wrapper neither knows nor cares that it is a LIKE argument.
All the wrapper will do when presented with a string value is to quote
apostrophes if needed so that the result is a valid SQL literal e.g.
'O''Brien'
If you need to escape % or _ in a LIKE argument, do whatever the host
convention is.
E.g. you are searching for text that contains literally "5% discount",
with SQLite you could do:
[avoiding backslashes and concomitant confusion]
  LIKE '%5~% discount%' ESCAPE '~'
on the command line, so using DB-API:
  like_expr = user_input.replace("~", "~~").replace("%", "~%").replace
(etc etc)
  cursor.execute(
     "... LIKE ? ESCAPE '~' ...",
     (..., like_expr, ...)
     )

HTH,
John


From cjns1989 at gmail.com  Wed May 27 22:34:45 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Wed, 27 May 2009 22:34:45 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
Message-ID: <20090528023445.GE2896@turki.gavron.org>

I'm unsure about a python editor for everyone but since acquiring habits
takes time, I'm in favor of sticking to one editor for everything.

CJ


From van.lindberg at gmail.com  Wed May 27 23:18:29 2009
From: van.lindberg at gmail.com (VanL)
Date: Wed, 27 May 2009 22:18:29 -0500
Subject: Searching for pyvm
In-Reply-To: <4A19D61D.6020409@acm.org>
References: <4A19D61D.6020409@acm.org>
Message-ID: <4A1E0285.6050200@gmail.com>

Vladimir G. Ivanovic wrote:
> I'm looking for the sources to pyvm, a python virtual machine
> implementation which can run Python 2.4 bytecode.

The tarball for pyvm returns a 404, but you can still get the code to
pyvm by getting archive.org's copy:

http://web.archive.org/web/20061012230953/http://students.ceid.upatras.gr/~sxanth/pyvm/pyvm-1.2.tar.bz2

Thanks,

Van



From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 00:06:25 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 04:06:25 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
Message-ID: <0039e83c$0$9673$c3e8da3@news.astraweb.com>

On Wed, 27 May 2009 22:34:45 -0400, Chris Jones wrote:

> I'm unsure about a python editor for everyone but since acquiring habits
> takes time, I'm in favor of sticking to one editor for everything.

Or use an editor which follows user interface standards, rather than 
invents its own conventions for everything. That way you can trivially 
swap from one compliant application to another compliant application.

A good UI standard should mean that:

* common tasks should use the same interface in any application that 
supports that task;

* all functionality should be discoverable without reading the manual;

* the most common functions should be _trivially_ discoverable;

* don't penalise the user for mistakes: as few actions as possible should 
be irreversible, and those which are irreversible should _effectively_ 
warn the user that they are irreversible;

* simple interfaces are better than complicated interfaces (easy tasks 
should be easy to perform);

* but dumbing-down is not the same as simplifying (complicated tasks 
should be possible);

* if possible, all functionality should be capable of being performed by 
either the mouse or keyboard.


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 00:06:39 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 04:06:39 GMT
Subject: Inheritance and Design Question
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
	<mailman.807.1243459299.8015.python-list@python.org>
Message-ID: <0039e849$0$9673$c3e8da3@news.astraweb.com>

On Wed, 27 May 2009 17:21:23 -0400, Terry Reedy wrote:

> super() was designed for multiple inheritance.

Surely you mean that super() was designed for *inheritance*, multiple or 
singular? Working with single inheritance is part of the design, not an 
accident of implementation.


> The only reason I know
> to use it with single inheritance it to save a
> global-search-and-replace_with_confirmation if you change the name of
> the parent or change parents.

How about these reasons?

(1) If you're subclassing something you didn't write, you might not know 
whether it uses multiple or single inheritance.

(2) Even if you do know, you shouldn't care what the implementation of 
the parent is. Using super() allows you to be agnostic about the 
implementation, while calling Parent.method() directly ties you to a 
specific implementation.

(3) Your callers may want to inherit from your class, and if you fail to 
use super, you are condemning them to potentially buggy code if they use 
multiple inheritance.

(4) Using super() is no harder than avoiding super(). It takes a few 
extra characters to type, at worst:

super(MyClass, self).method(args)
Parent.method(self, args)


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 00:07:00 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 04:07:00 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de>
	<02204669$0$25303$c3e8da3@news.astraweb.com>
	<kkb00q.g62@spenarnc.xs4all.nl>
Message-ID: <0039e85f$0$9673$c3e8da3@news.astraweb.com>

On Wed, 27 May 2009 12:58:02 +0000, Albert van der Horst wrote:

>>And how is reduce() supposed to know whether or not some arbitrary
>>function is commutative?
> 
> Why would it or need it? A Python that understands the ``par'' keyword
> is supposed to know it can play some tricks with optimizing reduce() if
> the specific function is commutative.

Fine. Move the smarts out of reduce() into the compiler. How is the 
compiler supposed to know if an arbitrary function is commutative?



-- 
Steven


From paul.nospam at rudin.co.uk  Thu May 28 01:24:56 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Thu, 28 May 2009 06:24:56 +0100
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
	<4a1d628f$0$6471$426a74cc@news.free.fr>
	<mailman.810.1243464033.8015.python-list@python.org>
Message-ID: <87fxep6bpz.fsf@rudin.co.uk>

"Rhodri James" <rhodri at wildebst.demon.co.uk> writes:

> The feature that caused me to uninstall python-mode.el was its
> bloody-minded determination to regard '_' as a word character,
> something which caused me more typing that it ever saved.

Probably you could have changed this in a few minutes. Or does fiddling
with emacs lisp invalidate your python programmer's licence? ;-)



From rylesny at gmail.com  Thu May 28 01:34:26 2009
From: rylesny at gmail.com (ryles)
Date: Wed, 27 May 2009 22:34:26 -0700 (PDT)
Subject: unpickling a stream
References: <3efc7aa5-c9b7-4755-bd5f-a4e87518d423@x5g2000yqk.googlegroups.com>
Message-ID: <b303feff-e4bf-4b91-b94f-15f772ca9c78@q16g2000yqg.googlegroups.com>

On May 26, 3:25?pm, mso... at linuxmail.org wrote:
> Hello,
>
> I want to send a stream of pickled objects over a socket. ?Is there a
> standard way of ensuring that only complete objects are unpickled on
> the receiving side.
>
> client pseudo code:
> ? loop forever:
> ? ? receive some bytes on the socket
> ? ? if we have received a complete pickled object: ?<== How is this
> done?
> ? ? ? unpickle the object
>
> This isn't for a project, just trying to learn some more about the
> pickle module.
>
> Mike

If you'd like, you can turn a socket into a file-like object using its
makefile() method. An Unpickler will know when to stop reading from
the file (there's a STOP character in the pickle format). David
Beazley gives an example of this approach in Part 7 of "Generator
Tricks for Systems Programmers": http://www.dabeaz.com/generators/Generators.pdf


From andreengels at gmail.com  Thu May 28 01:53:17 2009
From: andreengels at gmail.com (Andre Engels)
Date: Thu, 28 May 2009 07:53:17 +0200
Subject: Inheritance and Design Question
In-Reply-To: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
Message-ID: <6faf39c90905272253o30273b38v4155e7694aa2fec0@mail.gmail.com>

On Wed, May 27, 2009 at 9:58 PM, imageguy <imageguy1206 at gmail.com> wrote:
> I have an object the I would like to use as a base class. ?Some of the
> methods I would like to override completely, but others I would simply
> like to call the base class method and use the return value in the
> child method. ?The purpose here is to eliminate the duplication of
> valuable code in the parent, when I really just need the child to
> operate of a results of the parent.
>
> Consider the following two classes;
>
> class Parent(object):
> ? ?def process(self, value):
> ? ? ? ?retval = "Parent.result('%s')" % value
> ? ? ? ?return retval
>
> class Child(Parent):
> ? ?def __init__(self):
> ? ? ? ?Parent.__init__(self)
>
> ? ?def process(self, value):
> ? ? ? ?retval = "Child.result('%s')" % super(Child, self).process
> (value)
> ? ? ? ?return retval
>
> So ....
>
> foo = Child()
> print foo.process('the value')
>>> Child.result('Parent.result('the value')')
>
> IS there another pattern or idiom that would accomplish this?
> This seems a bit 'smelly' to me. ?Also seems almost the inverse of
> decorators, but I am not sure decorators would be appropriate in this
> case.

I think I would split out the calculation into two methods in this case:

class Parent(object):
    def process_essential(self,value):
        retval = "Parent.result('%s')" % value
        return retval

    def processs(self,value):
        return process_essential(value)

class Child(Parent):
    def process(self,value):
        retval = "Child.result('%s')" % process_essential(value)
        return retval


-- 
Andr? Engels, andreengels at gmail.com


From sisibley at gmail.com  Thu May 28 02:25:53 2009
From: sisibley at gmail.com (Scott Sibley)
Date: Thu, 28 May 2009 01:25:53 -0500
Subject: Resize ctypes array
Message-ID: <cb4d391b0905272325h7b81f40fn1c506e8fd837df17@mail.gmail.com>

I'd like to resize a ctypes array. As you can see, ctypes.resize doesn't
work like it could. I can write a function to resize an array, but I wanted
to know some other solutions to this. Maybe I'm missing some ctypes trick or
maybe I simply used resize wrong. The name c_long_Array_0 seems to tell me
this may not work like I want. What is resize meant for?

>>> from ctypes import *
>>> c_int * 0
<class '__main__.c_long_Array_0'>
>>> intType = c_int * 0
>>> foo = intType()
>>> foo
<__main__.c_long_Array_0 object at 0xb7ed9e84>
>>> foo[0]
Traceback (most recent call last):

  File "<stdin>", line 1, in <module>
IndexError: invalid index
>>> resize(foo, sizeof(c_int * 1))
>>> foo[0]
Traceback (most recent call last):

  File "<stdin>", line 1, in <module>
IndexError: invalid index
>>> foo
<__main__.c_long_Array_0 object at 0xb7ed9e84>

Maybe go with something like:

>>> ctypes_resize = resize
>>> def resize(arr, type):
...     tmp = type()
...     for i in range(len(arr)):
...         tmp[i] = arr[i]
...     return tmp
...
...
>>> listType = c_int * 0
>>> list = listType()
>>> list = resize(list, c_int * 1)
>>> list[0]
0
>>>


But that's ugly passing the type instead of the size. It works for its
purpose and that's it.
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From tiskanto at gmail.com  Thu May 28 02:32:10 2009
From: tiskanto at gmail.com (Teguh Iskanto)
Date: Thu, 28 May 2009 16:32:10 +1000
Subject: DB-API execute params, am I missing something?
In-Reply-To: <gvkoep$oii$3@lust.ihug.co.nz>
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
	<gvkoep$oii$3@lust.ihug.co.nz>
Message-ID: <e137e8260905272332p2f3bde87q68fd2a2b2ee1991e@mail.gmail.com>

On Thu, May 28, 2009 at 11:12 AM, Lawrence D'Oliveiro
<ldo at geek-central.gen.new_zealand> wrote:

> In message <784h2cF1kem0kU1 at mid.uni-berlin.de>, Diez B. Roggisch wrote:
>
> > Lawrence D'Oliveiro wrote:
> >
> >> In message <mailman.766.1243354300.8015.python-list at python.org>, Dennis
> >> Lee Bieber wrote:
> >>
> >>> Notice that db.literal() call? That's part of the mechanism used to
> >>> escape and quote parameters -- it only returns strings that are safe
> for
> >>> insertion into the SQL statement.
> >>
> >> Does it deal with "like"-wildcards?
> >
> > Why shouldn't it?
> >
> > cursor.execute("select * from table where column like %s", "%name%")
>
> What if the string you're searching for includes a "%" or "_" character?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

>>> A="0"
>>> B="%"
>>>
>>> print "select * from test_table where a like '%%%s%%' " %A
select * from test_table where a like '%0%'
>>>
>>> print "select * from test_table where a like '%%%s%%' " %B
select * from test_table where a like '%%%'
>>>

HTH
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From pavlovevidence at gmail.com  Thu May 28 02:44:39 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 27 May 2009 23:44:39 -0700 (PDT)
Subject: Inheritance and Design Question
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
Message-ID: <98be0fe7-9e6f-4015-9374-7b62538ea933@v23g2000pro.googlegroups.com>

On May 27, 12:58?pm, imageguy <imageguy1... at gmail.com> wrote:
> I have an object the I would like to use as a base class. ?Some of the
> methods I would like to override completely, but others I would simply
> like to call the base class method and use the return value in the
> child method. ?The purpose here is to eliminate the duplication of
> valuable code in the parent, when I really just need the child to
> operate of a results of the parent.
>
> Consider the following two classes;
>
> class Parent(object):
> ? ? def process(self, value):
> ? ? ? ? retval = "Parent.result('%s')" % value
> ? ? ? ? return retval
>
> class Child(Parent):
> ? ? def __init__(self):
> ? ? ? ? Parent.__init__(self)
>
> ? ? def process(self, value):
> ? ? ? ? retval = "Child.result('%s')" % super(Child, self).process
> (value)
> ? ? ? ? return retval
>
> So ....
>
> foo = Child()
> print foo.process('the value')
>
> >> Child.result('Parent.result('the value')')
>
> IS there another pattern or idiom that would accomplish this?
> This seems a bit 'smelly' to me. ?Also seems almost the inverse of
> decorators, but I am not sure decorators would be appropriate in this
> case.

I see nothing wrong with it, although if it is possible and convenient
to rename the base class method, as Andre Engels suggests, then that's
usually how I'd do it.

Sometimes it's not convenient to choose a different name for the base
class method, such as when you have several subclasses, most of which
don't override the method, but a few do.  In that case I'd do it same
way as you did.

One thing that does smell is your use of both old-style base class
access (Parent.__init__(self)) and newer-style (super
(Child,self).process()) in the same class.  Pick one method and stick
with it.


Carl Banks


From sisibley at gmail.com  Thu May 28 02:50:01 2009
From: sisibley at gmail.com (Scott Sibley)
Date: Thu, 28 May 2009 01:50:01 -0500
Subject: Resize ctypes array
In-Reply-To: <cb4d391b0905272325h7b81f40fn1c506e8fd837df17@mail.gmail.com>
References: <cb4d391b0905272325h7b81f40fn1c506e8fd837df17@mail.gmail.com>
Message-ID: <cb4d391b0905272350i1c23b7d6j9aab340ad577c9fc@mail.gmail.com>

I found an answer to this over on Stackoverflow.
http://stackoverflow.com/questions/919369/resize-ctypes-array

On Thu, May 28, 2009 at 1:25 AM, Scott Sibley <sisibley at gmail.com> wrote:

> I'd like to resize a ctypes array. As you can see, ctypes.resize doesn't
> work like it could. I can write a function to resize an array, but I wanted
> to know some other solutions to this. Maybe I'm missing some ctypes trick or
> maybe I simply used resize wrong. The name c_long_Array_0 seems to tell me
> this may not work like I want. What is resize meant for?
>
> >>> from ctypes import *
> >>> c_int * 0
> <class '__main__.c_long_Array_0'>
>
> >>> intType = c_int * 0
> >>> foo = intType()
> >>> foo
> <__main__.c_long_Array_0 object at 0xb7ed9e84>
> >>> foo[0]
> Traceback (most recent call last):
>
>
>   File "<stdin>", line 1, in <module>
>
> IndexError: invalid index
> >>> resize(foo, sizeof(c_int * 1))
>
> >>> foo[0]
> Traceback (most recent call last):
>
>
>   File "<stdin>", line 1, in <module>
>
> IndexError: invalid index
> >>> foo
> <__main__.c_long_Array_0 object at 0xb7ed9e84>
>
>
> Maybe go with something like:
>
> >>> ctypes_resize = resize
> >>> def resize(arr, type):
>
> ...     tmp = type()
> ...     for i in range(len(arr)):
>
> ...         tmp[i] = arr[i]
> ...     return tmp
> ...
> ...
> >>> listType = c_int * 0
> >>> list = listType()
> >>> list = resize(list, c_int * 1)
>
> >>> list[0]
> 0
> >>>
>
>
> But that's ugly passing the type instead of the size. It works for its purpose and that's it.
>
>
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From mobiledreamers at gmail.com  Thu May 28 03:05:40 2009
From: mobiledreamers at gmail.com (mobiledreamers at gmail.com)
Date: Thu, 28 May 2009 00:05:40 -0700
Subject: How do you serve Cheetah in production? webpy+cheetah
Message-ID: <c1870d60905280005v181aa8f9lda0d3903650bdd11@mail.gmail.com>

How do you serve *Cheetah* in *production*?

Guys can you share the setup on how to precompile and serve cheetah in
production

Since we dont compile templates in webpy it is getting upstream time out
errors. If you could share a good best practise it would help

*

Jeremy jeremy.james at gmail.com wrote: For a production site, I use Cheetah
with pre-compiled templates - it's very fast (the templates import
especially quickly when python compiled and optimised). A bit of magic with
the imp module takes a template name and a base directory (configured in a
site-specific config) and loads up that template, taking care of #extends
and
import directives as appropriate. I don't use the built-in support for

Cheetah, however. The new template library is also only imported to display
the debugerror page


-- 
Bidegg worlds best auction site
http://bidegg.com
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From ejohnso9 at earthlink.net  Thu May 28 03:49:30 2009
From: ejohnso9 at earthlink.net (Erik Johnson)
Date: Thu, 28 May 2009 00:49:30 -0700 (PDT)
Subject: Building PIL under Cygwin & Python 2.5
Message-ID: <c056aa87-8f61-497b-ac46-065fd2bca9ae@w35g2000prg.googlegroups.com>

This has apparently been a problematic thing for a while now, as the
following article indicates.  I first ran into the error message about
not being able to remap C:\cygwin\bin\tk84.dll to be the same address
as it's parent.

Using that information, Google helped me find this article:
http://blog.datahammer.info/2008/11/install-pil-under-cygwin-python-25.html

After following it's advice and running:
$ ./rebase -b 0x1000000000 tk84.dll

I was able to get the PIL build to proceed, but when it was done, it
said that there was no support built for Tk, and I then noticed that
basic Tkinter functionality was broken from the Python interpreter.

I went back to Cygwin setup, and had it reinstall the tcl/tk package,
and then Tkinter (import from the interactive interp.) got fixed.

Googling some more, I found this article (which implied datahammer
isn't quite right):  http://www.pythonchallenge.com/forums/viewtopic.php?t=135

I ran /usr/bin/rebaseall (from ash)(and if you end up doing this
yourself, be aware that it takes a while - I was afraid that process
had hung and I was going to have to rebuild the whole Cygwin shooting
match from scratch, but it eventually completed (silently)).

After this, I checked that Tkinter still worked from Python (it did),
and then tore out the whole PIL directory (Imaging-1.1.6) I had tried
to install from before, re-extracted the tar file to get a clean
install directory, and then again attempted to build PIL.  Now,
instead of getting the failure message about not being able to remap
the dll, the build just hangs:

$ python setup.py build_ext -i
running build_ext
building '_imaging' extension
creating build
creating build/temp.cygwin-1.5.25-i686-2.5
creating build/temp.cygwin-1.5.25-i686-2.5/libImaging
gcc -fno-strict-aliasing -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-
prototypes -DHAVE_LIBJPEG -DHAVE_LIBZ -I/usr/include/freetype2 -
IlibImaging -I/usr/include -I/home/ej/python/PIL/jpeg-6b -I/usr/
include/python2.5 -c _imaging.c -o build/temp.cygwin-1.5.25-i686-2.5/
_imaging.o

<eventually hit CTRL-C to leave>

Now, I'm rather stuck and I'm thinking "This really shouldn't be that
hard."

So, rebasing (rebaseall'ing) the cygwin system as outlined in the
datahammer blog entry (along with the ash advice of the pychallenge
article) still doesn't seem to be enough to get a clean build.

I think this is an issue that probably needs to be addressed by PIL
maintainers that fully understand the root of the problem (and it
should probably go in the PIL FAQ), but in the meantime does anyone
out there know how to get around this issue?

Thanks,
-ej


From half.italian at gmail.com  Thu May 28 04:11:17 2009
From: half.italian at gmail.com (Sean DiZazzo)
Date: Thu, 28 May 2009 01:11:17 -0700 (PDT)
Subject: newbie: popen question
References: <328e5cd4-bc4e-47bf-b8e2-91764351c525@g22g2000pra.googlegroups.com>
Message-ID: <75004846-9f60-401f-9a7b-adbc28add28b@x31g2000prc.googlegroups.com>

On May 27, 6:10?pm, thebiggestbangthe... at gmail.com wrote:
> hello everyone :-),
> ? ? ? ? ? ? ? ? ? ? ? ? ?I am a newbie to python. I am trying to run a
> bash script from within a python program. I would greatly appreciate
> any pointers/comments about how to get around the problem I am facing.
>
> I want to run ?bash script: code.sh from within a python program.
> code.sh needs to be run like so from the command line
> [code]
> $ sudo code.sh arg1 arg2
> [/code]
>
> I read up on some documentation but am not very clear about how to use
> popen. I want to relegate the shell to a background process, but it
> needs to accept the sudo passwd too!
>
> I have tried
> [code]
> p = subprocess.Popen(['/bin/bash', 'sudo '+mypath+'code.sh '+arg1+'
> '+arg2],
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? stdout=subprocess.PIPE,
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? stderr=subprocess.STDOUT)
> [/code]
> I tried some code from stackoverflow.com/questions/694000/why-doesnt-
> subprocess-popen-always-return
>
> nothing really happens when this executes, the PIPE option pshes it to
> the background and I can't push in the sudo passwd. Can someone please
> give me an idea of how to go about this.
>
> To recap, I want to run a shell script, which needs to be started with
> sudo, and then push it into the background.
>
> Thanks,
> -A

Your best bet is to make sudo not ask for a password.  :)  If you
don't have the rights, then you can use pexpect to do what you want to
do.  http://pexpect.sourceforge.net/pexpect.html

See the second example on that page.

child = pexpect.spawn('scp foo myname at host.example.com:.')
child.expect ('Password:')
child.sendline (mypassword)

~Sean


From jeremiah.dodds at gmail.com  Thu May 28 04:25:06 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Thu, 28 May 2009 09:25:06 +0100
Subject: newbie: popen question
In-Reply-To: <75004846-9f60-401f-9a7b-adbc28add28b@x31g2000prc.googlegroups.com>
References: <328e5cd4-bc4e-47bf-b8e2-91764351c525@g22g2000pra.googlegroups.com>
	<75004846-9f60-401f-9a7b-adbc28add28b@x31g2000prc.googlegroups.com>
Message-ID: <12cbbbfc0905280125u757ce8c3u3300361d15233105@mail.gmail.com>

On Thu, May 28, 2009 at 9:11 AM, Sean DiZazzo <half.italian at gmail.com>wrote:

> On May 27, 6:10 pm, thebiggestbangthe... at gmail.com wrote:
> > hello everyone :-),
> >                          I am a newbie to python. I am trying to run a
> > bash script from within a python program. I would greatly appreciate
> > any pointers/comments about how to get around the problem I am facing.
> >
> > I want to run  bash script: code.sh from within a python program.
> > code.sh needs to be run like so from the command line
> > [code]
> > $ sudo code.sh arg1 arg2
> > [/code]
> >
> > I read up on some documentation but am not very clear about how to use
> > popen. I want to relegate the shell to a background process, but it
> > needs to accept the sudo passwd too!
> >
> > I have tried
> > [code]
> > p = subprocess.Popen(['/bin/bash', 'sudo '+mypath+'code.sh '+arg1+'
> > '+arg2],
> >                                     stdout=subprocess.PIPE,
> >                                     stderr=subprocess.STDOUT)
> > [/code]
> > I tried some code from stackoverflow.com/questions/694000/why-doesnt-
> > subprocess-popen-always-return
> >
> > nothing really happens when this executes, the PIPE option pshes it to
> > the background and I can't push in the sudo passwd. Can someone please
> > give me an idea of how to go about this.
> >
> > To recap, I want to run a shell script, which needs to be started with
> > sudo, and then push it into the background.
> >
> > Thanks,
> > -A
>
> Your best bet is to make sudo not ask for a password.  :)  If you
> don't have the rights, then you can use pexpect to do what you want to
> do.  http://pexpect.sourceforge.net/pexpect.html
>

Whoah there. Pexpect, yes. Making sudo not ask for a password? Only if you
tell sudo to only not ask for a password for _this_ file. Telling sudo to
not require a password at all is asking for trouble.

Also, modifying sudo to allow this script to run without a password would
require that to be done on every machine that the OP wants to run on.

OP: use pexpect.
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From noone at example.com  Thu May 28 04:36:25 2009
From: noone at example.com (Jon Bendtsen)
Date: Thu, 28 May 2009 10:36:25 +0200
Subject: nntplib.NNTPTemporaryError: 441 Article has no body -- just 
	headers
In-Reply-To: <mailman.821.1243494606.8015.python-list@python.org>
References: <gvjbgm$12up$1@munin.diku.dk>
	<mailman.821.1243494606.8015.python-list@python.org>
Message-ID: <4A1E4D09.60402@example.com>

Dennis Lee Bieber wrote:
> On Wed, 27 May 2009 14:25:58 +0200, Jon Bendtsen <noone at example.com>
> declaimed the following in gmane.comp.python.general:
> 
>> 'From: root at laerdal.dk\nSubject: testing\nNewsgroups: test\nBody:
>> \n\n\nfoobar\n\n\n.\n\n\n'
>>
> 	I believe NNTP, like SMTP, requires \r\n line termination.

I will try it, but why does it then work when it posts the file? The
file is a std. unix file, so it should also only have \n line
termination.


From ldo at geek-central.gen.new_zealand  Thu May 28 04:57:13 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 28 May 2009 20:57:13 +1200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
	<gvkoep$oii$3@lust.ihug.co.nz>
	<mailman.819.1243494051.8015.python-list@python.org>
Message-ID: <gvljl9$8hg$4@lust.ihug.co.nz>

In message <mailman.819.1243494051.8015.python-list at python.org>, Dennis Lee 
Bieber wrote:

> On Thu, 28 May 2009 13:12:57 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
> 
>> 
>> What if the string you're searching for includes a "%" or "_" character?
> 
>    >>> db.literal((... "%wildcard%" ...))
>    (... "'%wildcard%'" ...)

Doesn't look like it worked, does it?



From ldo at geek-central.gen.new_zealand  Thu May 28 04:58:07 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 28 May 2009 20:58:07 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <gvljmv$8hg$5@lust.ihug.co.nz>

In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano 
wrote:

> A good UI standard should mean that:
> 
> * all functionality should be discoverable without reading the manual;

Which means no scripting languages are allowed?



From timothywayne.cook at gmail.com  Thu May 28 05:23:13 2009
From: timothywayne.cook at gmail.com (Tim Cook)
Date: Thu, 28 May 2009 02:23:13 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <3e609f22-ee9f-42dc-9877-99566e232aba@f19g2000yqh.googlegroups.com>

On May 26, 9:07?am, Lacrima <Lacrima.Ma... at gmail.com> wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

I use nothing but Wing.  Their support is great as well.



From cjns1989 at gmail.com  Thu May 28 05:44:07 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Thu, 28 May 2009 05:44:07 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <0039e83c$0$9673$c3e8da3@news.astraweb.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <20090528094407.GF2896@turki.gavron.org>

On Thu, May 28, 2009 at 12:06:25AM EDT, Steven D'Aprano wrote:
> On Wed, 27 May 2009 22:34:45 -0400, Chris Jones wrote:

> > I'm unsure about a python editor for everyone but since acquiring
> > habits takes time, I'm in favor of sticking to one editor for
> > everything.
> 
> Or use an editor which follows user interface standards, rather than
> invents its own conventions for everything. That way you can trivially
> swap from one compliant application to another compliant application.
> 
> A good UI standard should mean that:
> 
> * common tasks should use the same interface in any application that
> supports that task;
> 
> * all functionality should be discoverable without reading the manual;
> 
> * the most common functions should be _trivially_ discoverable;
> 
> * don't penalise the user for mistakes: as few actions as possible
> should be irreversible, and those which are irreversible should
> _effectively_ warn the user that they are irreversible;
> 
> * simple interfaces are better than complicated interfaces (easy tasks
> should be easy to perform);
> 
> * but dumbing-down is not the same as simplifying (complicated tasks
> should be possible);
> 
> * if possible, all functionality should be capable of being performed
> by either the mouse or keyboard.

All valid points on the face of it, but doesn't the above rule out both
vim and emacs?

CJ


From __peter__ at web.de  Thu May 28 06:03:49 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 28 May 2009 12:03:49 +0200
Subject: Python, Tkinter and popen problem
References: <mailman.803.1243448972.8015.python-list@python.org>
	<gvk2br$6bg$03$1@news.t-online.com>
	<mailman.811.1243469678.8015.python-list@python.org>
Message-ID: <gvlnh2$n7t$02$1@news.t-online.com>

norseman wrote:

> Peter Otten wrote:
>> norseman wrote:
>> 
>>> This was sent 5/19/09 and as yet has received no comments.
>> 
>>> I'm resending just in case a new reader might have an answer.
>> 
>> If you had posted two tiny scripts demonstrating your problem instead of
>> the longwinded explanation I might have tinkered.

> That's one of the problems - with Tkinter you don't get tiny files. :)

Nonsense. The minimal Tkinter program is

from Tkinter import Tk
root = Tk()
root.mainloop()

The idea is that you remove everything but the parts relevant to your 
problem (or build a toy example from scratch). This makes it easier for a 
non-guru to verify a potential answer. That non-guru might even be yourself, 
by the way.

> NOTE: program runs perfectly on both Linux and Windows XP Pro when run 
> from the keyboard. But not from another python program that wants the 
> phone line connected. (stdin/stdout)  Gee... There is never a County 
> Lineman when needed is there Glen? :)

It's not clear why you need to start the GUI at all as you seem to have 
control over boths scripts.

Peter



From paul.nospam at rudin.co.uk  Thu May 28 06:08:08 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Thu, 28 May 2009 11:08:08 +0100
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <87bppd5ylz.fsf@rudin.co.uk>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:


> * if possible, all functionality should be capable of being performed by 
> either the mouse or keyboard.

I'd imagine that the requirement that *all* functionality can be
performed with the mouse rules out many text editors. Almost the
defining feature of a text editor is the ability to type text... which
mostly happens with a keyboard.


From dudeja.rajat at gmail.com  Thu May 28 06:19:12 2009
From: dudeja.rajat at gmail.com (dudeja.rajat at gmail.com)
Date: Thu, 28 May 2009 11:19:12 +0100
Subject: Unpack less values from function's return values
Message-ID: <e0b6c39a0905280319xd0c2166kfc62fd03ae6ba124@mail.gmail.com>

Hi,

I'm using Python 2.5.2. I'm getting this error whenever I try to unpack less
values from a function.

ValueError: too many values to unpack


I want to know if there is a way I can unpack less values returning from a
function?

Thanks,
Rajat
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From clp2 at rebertia.com  Thu May 28 06:40:12 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 28 May 2009 03:40:12 -0700
Subject: Unpack less values from function's return values
In-Reply-To: <e0b6c39a0905280319xd0c2166kfc62fd03ae6ba124@mail.gmail.com>
References: <e0b6c39a0905280319xd0c2166kfc62fd03ae6ba124@mail.gmail.com>
Message-ID: <50697b2c0905280340l63176060je067cb0c78099fde@mail.gmail.com>

On Thu, May 28, 2009 at 3:19 AM,  <dudeja.rajat at gmail.com> wrote:
> Hi,
>
> I'm using Python 2.5.2. I'm getting this error whenever I try to unpack less
> values from a function.
>
> ValueError: too many values to unpack
>
>
> I want to know if there is a way I can unpack less values returning from a
> function?

Unpack them into throwaway variables:

def foo(): return 1,2,3,4

a, b, _, _ = foo()

In very new Python, you can also do:

a, b, *_ = foo()

Cheers,
Chris
-- 
http://blog.rebertia.com


From bellman at lysator.liu.se  Thu May 28 06:42:05 2009
From: bellman at lysator.liu.se (Thomas Bellman)
Date: Thu, 28 May 2009 10:42:05 +0000 (UTC)
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
Message-ID: <gvlppt$hk0$1@news.lysator.liu.se>

Roy Smith <roy at panix.com> wrote:

> In article <gvb8fn$7gm$1 at lust.ihug.co.nz>,
> Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:

>> The right thing to do is try to ensure that all your connections are
>> properly closed at shutdown. That may not be enough (if your server crashes
>> due to bugs), so the other thing you need to do is retry the socket open,
>> say, at 30-second intervals, until it succeeds.

> That may be a reasonable thing to do for production code, but when you're
> building and debugging a server, it's a real pain to not be able to restart
> it quickly whenever you want (or need) to.

Speaking as a sysadmin, running applications for production,
programs not using SO_REUSEADDR should be taken out and shot.

You *can't* ensure that TCP connections are "properly closed".
For example, a *client* crashing, or otherwise becoming
unreachable, will leave TCP connections unclosed, no matter
what you do.

Not using SO_REUSEADDR means forcing a service interruption of
half an hour (IIRC) if for some reason the service must be
restarted, or having to reboot the entire machine.  No thanks.
I have been in that situation.


-- 
Thomas Bellman,   Lysator Academic Computer Club,   Link??ping University
"Never let your sense of morals prevent you    !  Sweden ; +46-13 177780
 from doing what is right."  -- Salvor Hardin  !  bellman at lysator.liu.se


From andreas.roehler at online.de  Thu May 28 06:52:15 2009
From: andreas.roehler at online.de (Andreas Roehler)
Date: Thu, 28 May 2009 12:52:15 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <gvemos$old$2@ger.gmane.org>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvemos$old$2@ger.gmane.org>
Message-ID: <4A1E6CDF.3070300@online.de>

Esmail wrote:
> LittleGrasshopper wrote:
>>
>> So what do you guys use, and why? Hopefully we can keep this civil.
> 
> I use Emacs, just because I have been using this editor for
> all sorts of things in the last 20+ years.
> 
> I haven't been able to get the python mode to work for Windows

A bug-report would be fine... :)

In case you use python-mode.el, please refer to

https://launchpad.net/python-mode


Thanks


Andreas R?hler

--
https://code.launchpad.net/s-x-emacs-werkstatt/

> (do most of my work under Linux anyway), but other than that I'm
> pretty happy with it :-)
> 
> HTH,
> Esmail
> 



From apardon at forel.vub.ac.be  Thu May 28 06:52:47 2009
From: apardon at forel.vub.ac.be (Antoon Pardon)
Date: 28 May 2009 10:52:47 GMT
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<c9566044-6e50-42ca-aa02-9ff63206c601@g22g2000pra.googlegroups.com>
	<m2zlcz1ykl.fsf@googlemail.com>
Message-ID: <slrnh1sr7v.fef.apardon@rcpc42.vub.ac.be>

Op 2009-05-26, Arnaud Delobelle schreef <arnodel at googlemail.com>:
> Sumitava Mukherjee <smukh at cognobytes.com> writes:
>
>> On May 26, 11:39?pm, Sumitava Mukherjee <sm... at cognobytes.com> wrote:
>>> Hi all,
>>> I need to randomly sample from a list where all choices have weights
>>> attached to them. The probability of them being choosen is dependent
>>> on the weights.
>>> If say Sample list of choices are [A,B,C,D,E] and weights of the same
>>> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
>>> want the likeliness of them being chosen be in the order : D>A>C>E>B
>
> You mean A > D > C > E > B
>
>>> In short I mean if prob of a H is .9 and probability of T be 0.1 then
>>> if I draw 10 samples, 9 should be H and 1 should be T.
>>>
>>> I coudn't find a function in the module random that does so.
>>> Please can someone guide me how the above could be implemented [either
>>> through some function which exists and I don't know or pointers to
>>> some code snippets which does so]?
>>
>>>>>> [Oh, I forgot to mention. I am looking for sampling without replacement.]
>
> If you do sampling without replacement, you need to know the exact
> number of each of A, B, C, D, E in the sample, not just their relative
> frequency.

As far as I understand, you are given the exact number of each. It is one.
The numbers given are not relative frequencies of appearance but weights
to be attributed for picking them.

-- 
Antoon Pardon


From jeanmichel at sequans.com  Thu May 28 06:57:16 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 28 May 2009 12:57:16 +0200
Subject: Inheritance and Design Question
In-Reply-To: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
Message-ID: <4A1E6E0C.3060803@sequans.com>

imageguy wrote:
> I have an object the I would like to use as a base class.  Some of the
> methods I would like to override completely, but others I would simply
> like to call the base class method and use the return value in the
> child method.  The purpose here is to eliminate the duplication of
> valuable code in the parent, when I really just need the child to
> operate of a results of the parent.
>
> Consider the following two classes;
>
> class Parent(object):
>     def process(self, value):
>         retval = "Parent.result('%s')" % value
>         return retval
>
> class Child(Parent):
>     def __init__(self):
>         Parent.__init__(self)
>
>     def process(self, value):
>         retval = "Child.result('%s')" % super(Child, self).process
> (value)
>         return retval
>
> So ....
>
> foo = Child()
> print foo.process('the value')
>   
>>> Child.result('Parent.result('the value')')
>>>       
Try this

class Parent(object):

    def process(self, value):
        retval = "%s.result('%s')" % (self.__class__.__name__, value)
        return retval

class Child(Parent):
    def __init__(self):
        Parent.__init__(self)


foo = Child()
print foo.process('the value')
>>> Child.result('the value'')

Of course you cannot see the inheritance in the result, but I'm assuming you wanted only the instance class to be displayed.

Jean-Michel



From andreas.roehler at online.de  Thu May 28 06:59:48 2009
From: andreas.roehler at online.de (Andreas Roehler)
Date: Thu, 28 May 2009 12:59:48 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <op.uukccbg3a8ncjz@gnudebst>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<gvg5d7$382$2@lust.ihug.co.nz>	<mailman.741.1243325683.8015.python-list@python.org>	<roy-92C5E8.09222926052009@news.panix.com>
	<op.uukccbg3a8ncjz@gnudebst>
Message-ID: <4A1E6EA4.9030405@online.de>

Rhodri James wrote:
> On Tue, 26 May 2009 14:22:29 +0100, Roy Smith <roy at panix.com> wrote:
> 
>> My pet peeve is syntax-aware editors which get things wrong.  For
>> example,
>> the version of emacs I'm using now doesn't parse this properly:
>>
>> '''A triple-quoted string.  Some editors won't get this right'''
>>
>> The solution is to change the outer quotes to double-quotes, but it
>> annoys me when I have to change my code to appease a tool.
> 
> It's the separate python-mode that gets this (and much else) wrong.
> The Python mode that Ubuntu packages with emacs 22.2.1 works just
> fine.
> 

As it should do

python-mode.el from

https://launchpad.net/python-mode


From andreas.roehler at online.de  Thu May 28 07:09:18 2009
From: andreas.roehler at online.de (Andreas Roehler)
Date: Thu, 28 May 2009 13:09:18 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <op.uul09plha8ncjz@gnudebst>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<gvg5d7$382$2@lust.ihug.co.nz>	<mailman.741.1243325683.8015.python-list@python.org>	<roy-92C5E8.09222926052009@news.panix.com>	<mailman.782.1243385070.8015.python-list@python.org>	<4a1d628f$0$6471$426a74cc@news.free.fr>
	<op.uul09plha8ncjz@gnudebst>
Message-ID: <4A1E70DE.4080407@online.de>

Rhodri James wrote:
> On Wed, 27 May 2009 16:56:12 +0100, Bruno Desthuilliers
> <bruno.42.desthuilliers at websiteburo.invalid> wrote:
> 
>> Rhodri James a ?crit :
>>> On Tue, 26 May 2009 14:22:29 +0100, Roy Smith <roy at panix.com> wrote:
>>>
>>>> My pet peeve is syntax-aware editors which get things wrong.  For
>>>> example,
>>>> the version of emacs I'm using now doesn't parse this properly:
>>>>
>>>> '''A triple-quoted string.  Some editors won't get this right'''
>>>>
>>>> The solution is to change the outer quotes to double-quotes, but it
>>>> annoys me when I have to change my code to appease a tool.
>>>  It's the separate python-mode that gets this (and much else) wrong.
>>> The Python mode that Ubuntu packages with emacs 22.2.1 works just
>>> fine.
>>
>> On this point, indeed. But it also lacks almost every nice feature of
>> the One True python-mode (or at least did last time I had to update
>> this ... ubuntu box at work).
> 
> That rather depends on your definition of "nice".  The only feature of
> python-mode.el that I miss in python.el is the ability to run pylint from
> the menu,

Thanks mentioning it, I'll cc this to python-mode at python.org


 and I'll get over that.  The feature that caused me to uninstall
> python-mode.el was its bloody-minded determination to regard '_' as a word
> character, something which caused me more typing that it ever saved.
> 

Its just one line to comment in python-mode.el, like this:

  ;; (modify-syntax-entry ?\_ "w"  py-mode-syntax-table)






From andymac at bullseye.apana.org.au  Thu May 28 07:19:13 2009
From: andymac at bullseye.apana.org.au (Andrew MacIntyre)
Date: Thu, 28 May 2009 21:19:13 +1000
Subject: Building Python with icc on 64-bit Linux
In-Reply-To: <1DFB4A5E-0A88-4473-BB37-A5E4A668BF8E@laposte.net>
References: <1DFB4A5E-0A88-4473-BB37-A5E4A668BF8E@laposte.net>
Message-ID: <4A1E7331.6090808@bullseye.andymac.org>

Konrad Hinsen wrote:

> /home/shr/khinsen/tmp/Python-2.6.2/Modules/_ctypes/libffi/src/x86/ffi64.c(43): 
> \
> error: identifier "__int128_t" is undefined
>     __int128_t sse[MAX_SSE_REGS];
>     ^
> compilation aborted for 
> /home/shr/khinsen/tmp/Python-2.6.2/Modules/_ctypes/libf\
> fi/src/x86/ffi64.c (code 2)

That seems like a libffi configure failure (not properly handling 128bit
integers on this compiler/platform).

> and failed test:
> 
> test test_cmath failed -- Traceback (most recent call last):
>   File "/home/shr/khinsen/tmp/Python-2.6.2/Lib/test/test_cmath.py", line 
> 366, i\
> n test_specific_values
>     self.fail(error_message)
> AssertionError: acos0000: acos(complex(0.0, 0.0))
> Expected: complex(1.5707963267948966, -0.0)
> Received: complex(1.5707963267948966, 0.0)
> Received value insufficiently close to expected value.

I've seen this on other compilers/platforms.  The floating point support 
in 2.6 is being more rigorously tested.  This compiler/platform/math lib
doesn't seem to be explicitly handling -0.0 as different from 0.0.
test_math has other similar failures.

> Adding optimization yields even more failed tests. My configuration 
> options are:
> 
>     configure --prefix=$HOME CC=icc CXX=icc OPT=-O0
> 
> Did anyone encounter these problems before? Any solutions?

For the FP issues I wonder whether there's a compiler option that affects
how -0.0 is handled, or possibly a different math library?

The libffi issue would require delving into the libffi source and 
adjusting its configure script to properly handle the problematic case.
Unless you need ctypes, this may be something you can skip over...

-- 
-------------------------------------------------------------------------
Andrew I MacIntyre                     "These thoughts are mine alone..."
E-mail: andymac at bullseye.apana.org.au  (pref) | Snail: PO Box 370
        andymac at pcug.org.au             (alt) |        Belconnen ACT 2616
Web:    http://www.andymac.org/               |        Australia


From motoom at xs4all.nl  Thu May 28 07:30:18 2009
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Thu, 28 May 2009 13:30:18 +0200
Subject: GUI Programming
In-Reply-To: <49E1E77F.4030308@dreams.sk>
References: <49E1E77F.4030308@dreams.sk>
Message-ID: <200905281330.18903.motoom@xs4all.nl>

On Sunday 12 April 2009 15:07:11 Gabriel wrote:

> I'm python newbie and i need to write gui for my school work in python.
> I need to write it really quick, because i haven't much time .)

Try Tkinter, which is included by default with most Python installations.

Writing simple programs is easy like:

   from Tkinter import *
   root=Tk()
   w=Label(root, text="Hello, world!")
   w.pack()
   root.mainloop()

See the tutorial at 
http://www.pythonware.com/library/tkinter/introduction/hello-tkinter.htm


Greetings, 

-- 
"The ability of the OSS process to collect and harness 
the collective IQ of thousands of individuals across 
the Internet is simply amazing." - Vinod Valloppillil 
http://www.catb.org/~esr/halloween/halloween4.html


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 07:38:33 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 11:38:33 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<mailman.823.1243503842.8015.python-list@python.org>
Message-ID: <003a5234$0$9673$c3e8da3@news.astraweb.com>

On Thu, 28 May 2009 05:44:07 -0400, Chris Jones wrote:

>> * if possible, all functionality should be capable of being performed
>> by either the mouse or keyboard.
> 
> All valid points on the face of it, but doesn't the above rule out both
> vim and emacs?


Your point is?


*ducks and runs*


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 07:44:55 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 11:44:55 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<87bppd5ylz.fsf@rudin.co.uk>
Message-ID: <003a53b2$0$9673$c3e8da3@news.astraweb.com>

On Thu, 28 May 2009 11:08:08 +0100, Paul Rudin wrote:

> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> 
> 
>> * if possible, all functionality should be capable of being performed
>> by either the mouse or keyboard.
> 
> I'd imagine that the requirement that *all* functionality can be
> performed with the mouse rules out many text editors. Almost the
> defining feature of a text editor is the ability to type text... which
> mostly happens with a keyboard.

Likewise graphics editors -- it's difficult if not impossible to edit an 
image pixel by pixel using the keyboard. Hence the "if possible". 

(Aside: It's really discouraging that, even on a technical newsgroup 
where most of the people are relatively intelligent, the provisos and 
qualifications I give seem to be ignored in favour of an unrealistically 
extreme interpretation.)

I do recall once in the mid 1980s, using a Macintosh with a broken 
keyboard. I was actually able to get useful work done by clicking letters 
on a virtual keyboard (the "Keyboard" desk accessory for those who 
remember it) and copying and pasting the text into the editor.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 07:50:52 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 11:50:52 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<gvljmv$8hg$5@lust.ihug.co.nz>
Message-ID: <003a5518$0$9673$c3e8da3@news.astraweb.com>

On Thu, 28 May 2009 20:58:07 +1200, Lawrence D'Oliveiro wrote:

> In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano
> wrote:
> 
>> A good UI standard should mean that:
>> 
>> * all functionality should be discoverable without reading the manual;
> 
> Which means no scripting languages are allowed?

"Should", not "must".

In any case, once you've scripted some particular piece of functionality, 
the application should allow you to discover the existence of that 
script. Does the application have a "Scripts" or "Plugins" menu (or 
equivalent)? Or do you have to rummage around in the file system, looking 
for secret scripts in undocumented locations?


-- 
Steven


From drobinow at gmail.com  Thu May 28 08:14:32 2009
From: drobinow at gmail.com (David Robinow)
Date: Thu, 28 May 2009 08:14:32 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1E70DE.4080407@online.de>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
	<4a1d628f$0$6471$426a74cc@news.free.fr> <op.uul09plha8ncjz@gnudebst>
	<4A1E70DE.4080407@online.de>
Message-ID: <4eb0089f0905280514v24b8ee83x5f61a209ba993c0f@mail.gmail.com>

On Thu, May 28, 2009 at 7:09 AM, Andreas Roehler
<andreas.roehler at online.de> wrote:
> Rhodri James wrote:
>>?and I'll get over that. ?The feature that caused me to uninstall
>> python-mode.el was its bloody-minded determination to regard '_' as a word
>> character, something which caused me more typing that it ever saved.
>
> Its just one line to comment in python-mode.el, like this:
>
> ?;; (modify-syntax-entry ?\_ "w" ?py-mode-syntax-table)
>
 Not really a good idea to make minor changes to distributed elisp.
You'll have to keep redoing the change every time a new version comes
out.
 Better to put something like this in your .emacs file.

  (eval-after-load "python-mode"
    '(modify-syntax-entry ?\_ " " py-mode-syntax-table))


From cjns1989 at gmail.com  Thu May 28 08:28:32 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Thu, 28 May 2009 08:28:32 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <003a5234$0$9673$c3e8da3@news.astraweb.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<mailman.823.1243503842.8015.python-list@python.org>
	<003a5234$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <20090528122832.GG2896@turki.gavron.org>

On Thu, May 28, 2009 at 07:38:33AM EDT, Steven D'Aprano wrote:

> Your point is?

notepad, otoh..

> *ducks and runs*

.. likewise.




From basti.wiesner at gmx.net  Thu May 28 08:31:38 2009
From: basti.wiesner at gmx.net (Sebastian Wiesner)
Date: Thu, 28 May 2009 14:31:38 +0200
Subject: newbie: popen question
References: <328e5cd4-bc4e-47bf-b8e2-91764351c525@g22g2000pra.googlegroups.com>
	<75004846-9f60-401f-9a7b-adbc28add28b@x31g2000prc.googlegroups.com>
Message-ID: <gvm079$asb$1@hoshi.visyn.net>

<Sean DiZazzo ? Donnerstag, 28. Mai 2009 10:11>

> Your best bet is to make sudo not ask for a password.  :)  If you
> don't have the rights, then you can use pexpect to do what you want to
> do.  http://pexpect.sourceforge.net/pexpect.html
> 
> See the second example on that page.
> 
> child = pexpect.spawn('scp foo myname at host.example.com:.')
> child.expect ('Password:')
> child.sendline (mypassword)

The sudo password prompt is very configurable, so changing the configuration 
to allow execution without password input is really the best option.

-- 
Freedom is always the freedom of dissenters.
                                      (Rosa Luxemburg)



From rhodri at wildebst.demon.co.uk  Thu May 28 08:34:12 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 28 May 2009 13:34:12 +0100
Subject: What text editor is everyone using for Python
In-Reply-To: <87fxep6bpz.fsf@rudin.co.uk>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
	<4a1d628f$0$6471$426a74cc@news.free.fr>
	<mailman.810.1243464033.8015.python-list@python.org>
	<87fxep6bpz.fsf@rudin.co.uk>
Message-ID: <op.uum3vakna8ncjz@gnudebst>

On Thu, 28 May 2009 06:24:56 +0100, Paul Rudin <paul.nospam at rudin.co.uk>  
wrote:

> "Rhodri James" <rhodri at wildebst.demon.co.uk> writes:
>
>> The feature that caused me to uninstall python-mode.el was its
>> bloody-minded determination to regard '_' as a word character,
>> something which caused me more typing that it ever saved.
>
> Probably you could have changed this in a few minutes. Or does fiddling
> with emacs lisp invalidate your python programmer's licence? ;-)

I probably could, but uninstalling didn't even require that much
brain-power, and as I said I only missed one feature (and that not
much).

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From jason at powerpull.net  Thu May 28 08:52:13 2009
From: jason at powerpull.net (Jason S. Friedman)
Date: Thu, 28 May 2009 12:52:13 +0000
Subject: What text editor is everyone using for Python
In-Reply-To: <mailman.3058.1243514102.8014.python-list@python.org>
References: <mailman.3058.1243514102.8014.python-list@python.org>
Message-ID: <4A1E88FD.8040409@powerpull.net>

I use Eclipse (www.eclipse.org) with the PyDev plugin 
(pydev.sourceforge.net).


From ebonak at hotmail.com  Thu May 28 08:52:33 2009
From: ebonak at hotmail.com (Esmail)
Date: Thu, 28 May 2009 08:52:33 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1E6CDF.3070300@online.de>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<gvemos$old$2@ger.gmane.org>
	<4A1E6CDF.3070300@online.de>
Message-ID: <4A1E8911.80108@hotmail.com>

Andreas Roehler wrote:
> Esmail wrote:
>> LittleGrasshopper wrote:
>>> So what do you guys use, and why? Hopefully we can keep this civil.
>> I use Emacs, just because I have been using this editor for
>> all sorts of things in the last 20+ years.
>>
>> I haven't been able to get the python mode to work for Windows
> 
> A bug-report would be fine... :)
> 
> In case you use python-mode.el, please refer to
> 
> https://launchpad.net/python-mode
> 

Hi,

This got me to waste a bunch of time first with (add-to-list) unsuccessfully
before I checked to see if there was an update to emacs distribution/bundle
I use under Windows, which is

http://vgoulet.act.ulaval.ca/en/ressources/emacs/windows

Using its default .emacs I was able to get the python mode to work fine.
(I suspect there was something off in my ancient .emacs file which I had
been porting from system to system in the last 10 years  or so).

Glad this thread motivated me to upgrade/check on this.

Regards,
Esmail



From google at mrabarnett.plus.com  Thu May 28 09:46:34 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 28 May 2009 14:46:34 +0100
Subject: Unpack less values from function's return values
In-Reply-To: <50697b2c0905280340l63176060je067cb0c78099fde@mail.gmail.com>
References: <e0b6c39a0905280319xd0c2166kfc62fd03ae6ba124@mail.gmail.com>
	<50697b2c0905280340l63176060je067cb0c78099fde@mail.gmail.com>
Message-ID: <4A1E95BA.6020506@mrabarnett.plus.com>

Chris Rebert wrote:
> On Thu, May 28, 2009 at 3:19 AM,  <dudeja.rajat at gmail.com> wrote:
>> Hi,
>>
>> I'm using Python 2.5.2. I'm getting this error whenever I try to unpack less
>> values from a function.
>>
>> ValueError: too many values to unpack
>>
>>
>> I want to know if there is a way I can unpack less values returning from a
>> function?
> 
> Unpack them into throwaway variables:
> 
> def foo(): return 1,2,3,4
> 
> a, b, _, _ = foo()
> 
> In very new Python, you can also do:
> 
> a, b, *_ = foo()
> 
Or:

a, b = foo()[ : 2]


From 2489271 at gmail.com  Thu May 28 09:46:41 2009
From: 2489271 at gmail.com (paffnucy)
Date: Thu, 28 May 2009 06:46:41 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <35ea50fb-b74f-4d1a-8bad-8c9be92f5aac@p4g2000vba.googlegroups.com>

Or you can try pyscripter
http://code.google.com/p/pyscripter/
Very fast, lightwieght and powerfull python editor.


From bobby.house at gmail.com  Thu May 28 10:47:32 2009
From: bobby.house at gmail.com (Bobby)
Date: Thu, 28 May 2009 07:47:32 -0700 (PDT)
Subject: Unpack less values from function's return values
References: <e0b6c39a0905280319xd0c2166kfc62fd03ae6ba124@mail.gmail.com> 
	<mailman.836.1243509329.8015.python-list@python.org>
Message-ID: <614a8462-eeed-435c-be78-d5286f07b34d@q16g2000yqg.googlegroups.com>

On May 28, 5:40?am, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, May 28, 2009 at 3:19 AM, ?<dudeja.ra... at gmail.com> wrote:
> > Hi,
>
> > I'm using Python 2.5.2. I'm getting this error whenever I try to unpack less
> > values from a function.
>
> > ValueError: too many values to unpack
>
> > I want to know if there is a way I can unpack less values returning from a
> > function?
>
> Unpack them into throwaway variables:
>
> def foo(): return 1,2,3,4
>
> a, b, _, _ = foo()
>
> In very new Python, you can also do:
>
> a, b, *_ = foo()
>
> Cheers,
> Chris
> --http://blog.rebertia.com

You could also do something like
a,b = foo()[:2]


From aahz at pythoncraft.com  Thu May 28 10:55:33 2009
From: aahz at pythoncraft.com (Aahz)
Date: 28 May 2009 07:55:33 -0700
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<gv4st8$11t$1@ger.gmane.org>
	<mailman.795.1243436849.8015.python-list@python.org>
	<4a1da210$0$90265$14726298@news.sunsite.dk>
Message-ID: <gvm8l5$hk9$1@panix5.panix.com>

In article <4a1da210$0$90265$14726298 at news.sunsite.dk>,
Mark Dickinson <dickinsm at gmail.com> wrote:
>
>This is getting rather long.  Perhaps I should put the above comments
>together into a 'post-PEP' document.

Yes, you should.  Better explanation of floating point benefits everyone
when widely available.  I even learned a little bit here and I've been
following this stuff for a while (though by no means any kind of
numerical expert).
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In many ways, it's a dull language, borrowing solid old concepts from
many other languages & styles:  boring syntax, unsurprising semantics,
few automatic coercions, etc etc.  But that's one of the things I like
about it."  --Tim Peters on Python, 16 Sep 1993


From FongAndrew at gmail.com  Thu May 28 11:50:00 2009
From: FongAndrew at gmail.com (Andrew Fong)
Date: Thu, 28 May 2009 08:50:00 -0700 (PDT)
Subject: Most pythonic way to truncate unicode?
Message-ID: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>

I need to ...

1) Truncate long unicode (UTF-8) strings based on their length in
BYTES. For example, u'\u4000\u4001\u4002 abc' has a length of 7 but
takes up 13 bytes. Since u'\u4000' takes up 3 bytes, I want truncate
(u'\u4000\u4001\u4002 abc',3) == u'\u4000' -- as compared to
u'\u4000\u4001\u4002 abc'[:3] == u'\u4000\u4001\u4002'.

2) I don't want to accidentally chop any unicode characters in half.
If the byte truncate length would normally cut a unicode character in
2, then I just want to drop the whole character, not leave an orphaned
byte. So truncate(u'\u4000\u4001\u4002 abc',4) == u'\u4000' ... as
opposed to getting UnicodeDecodeError.

I'm using Python2.6, so I have access to things like bytearray. Are
there any built-in ways to do something like this already? Or do I
just have to iterate over the unicode string?

-- Andrew


From urbangabo at gmail.com  Thu May 28 11:58:28 2009
From: urbangabo at gmail.com (Gabor Urban)
Date: Thu, 28 May 2009 17:58:28 +0200
Subject: What text editor is everyone using for Python
Message-ID: <f7ac28aa0905280858w736ebef5h827b94e86bd07d85@mail.gmail.com>

I use Emacs, as for the other editing activities. I like it for it is
very powerfull.

-- 
Linux: Choice of a GNU Generation


From __peter__ at web.de  Thu May 28 11:58:35 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 28 May 2009 17:58:35 +0200
Subject: Most pythonic way to truncate unicode?
References: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>
Message-ID: <gvmca7$l3n$00$1@news.t-online.com>

Andrew Fong wrote:

> I need to ...
> 
> 1) Truncate long unicode (UTF-8) strings based on their length in
> BYTES. For example, u'\u4000\u4001\u4002 abc' has a length of 7 but
> takes up 13 bytes. Since u'\u4000' takes up 3 bytes, I want truncate
> (u'\u4000\u4001\u4002 abc',3) == u'\u4000' -- as compared to
> u'\u4000\u4001\u4002 abc'[:3] == u'\u4000\u4001\u4002'.
> 
> 2) I don't want to accidentally chop any unicode characters in half.
> If the byte truncate length would normally cut a unicode character in
> 2, then I just want to drop the whole character, not leave an orphaned
> byte. So truncate(u'\u4000\u4001\u4002 abc',4) == u'\u4000' ... as
> opposed to getting UnicodeDecodeError.
> 
> I'm using Python2.6, so I have access to things like bytearray. Are
> there any built-in ways to do something like this already? Or do I
> just have to iterate over the unicode string?

How about

>>> u"???".encode("utf8")[:5].decode("utf8", "ignore")
u'\xe4\xf6'
>>> print _
??

Peter



From durumdara at gmail.com  Thu May 28 12:29:31 2009
From: durumdara at gmail.com (Durumdara)
Date: Thu, 28 May 2009 18:29:31 +0200
Subject: Deletion/record visibility error in PG with Python...
Message-ID: <9e384ef60905280929t1a8bff86le33ff5f46a0abb05@mail.gmail.com>

Hi!

PGSQL makes me crazy...

I port my apps to PGSQL, and I near to finish - but I got this problem...

Params: PGSQL 8.3, Windows, Pylons, PGDB, DBUTILS...

I opened the connection with DBUTILS. I have one thread (the test thread),
possible it have more in the background, I don't know...

See this pseudocode:

start trs ("rollback; begin;")
delete old recs
insert new recs
commit

I delete all of old records with:
"delete from levelfo where level = :level"

This I do in one transaction that protect the next sequences to.

Later I want to insert the records, BUT:

        def GetCodes(reks):
            l = []
            for rek in reks:
                l.append(str(rek['KOD']))
            return str(l)
        def LogInsertedReks(Index):
            csql = "select * from levelfo where level=%d" %
self.LevelRek['KOD']
            self.Cur.execute(csql)
            reks = dwdb.FetchAll(self.Cur)
            self.log.info(Index + ' #### INSERTED REKS ####')
            self.log.info('%s' % GetCodes(reks))

        for levelforek in self.LevelFoReks:
            LogInsertedReks('Start1')
            LogInsertedReks('Start2')
            LogInsertedReks('Start3')
            LogInsertedReks('Start4')
            LogInsertedReks('Start5')
            LogInsertedReks('Start6')
            kod = levelforek['KOD']
            self.log.info('#### INSERT ####')
            self.log.info('%s' % levelforek['KOD'])
            LogInsertedReks('Start7')
            LogInsertedReks('Start8')
            LogInsertedReks('Start9')

See this log:
18:07:02,276 INFO  [xxx] Start1 #### INSERTED REKS ####
18:07:02,276 INFO  [xxx] []
18:07:02,292 INFO  [xxx] Start2 #### INSERTED REKS ####
18:07:02,292 INFO  [xxx] []
18:07:02,292 INFO  [xxx] Start3 #### INSERTED REKS ####
18:07:02,292 INFO  [xxx] []
18:07:02,306 INFO  [xxx] Start4 #### INSERTED REKS ####
18:07:02,306 INFO  [xxx] []
18:07:02,306 INFO  [xxx] Start5 #### INSERTED REKS ####
18:07:02,306 INFO  [xxx] []
18:07:02,306 INFO  [xxx] Start6 #### INSERTED REKS ####
18:07:02,306 INFO  [xxx] []
18:07:02,306 INFO  [xxx] #### INSERT ####
18:07:02,306 INFO  [xxx] 11551
18:07:02,306 INFO  [xxx] Start7 #### INSERTED REKS ####
18:07:02,306 INFO  [xxx] []
18:07:02,619 INFO  [xxx] Start8 #### INSERTED REKS ####
18:07:02,619 INFO  [xxx] ['11555', '11556', '11557', '11558']
18:07:02,634 INFO  [xxx] Start9 #### INSERTED REKS ####
18:07:02,634 INFO  [xxx] ['11555', '11556', '11557', '11558']
18:07:02,697 INFO  [xxx] After UID #### INSERTED REKS ####
18:07:02,697 INFO  [xxx] ['11555', '11556', '11557', '11558']

As you see, I don't do anything (like db operations), and deleted records
are appearing...
Hmmmm... possible is it a cursor changing?

When I change my logger to see the object ids, I can see the cursor changing
(in the background):

18:21:29,134 INFO  [xxx] Start7 #### INSERTED REKS ####
18:21:29,134 INFO  [xxx] []
18:21:29,134 INFO  [xxx] Start7 #### CURSOR INFO ####
18:21:29,134 INFO  [xxx] [<DBUtils.SteadyDB.SteadyDBCursor instance at
0x01955710>]
18:21:29,134 INFO  [xxx] [<DBUtils.SteadyDB.SteadyDBConnection instance at
0x019555A8>]
********** 18:21:29,134 INFO  [xxx] [<pgdb.pgdbCursor instance at
0x019556E8>]
18:21:29,431 INFO  [xxx] Start8 #### INSERTED REKS ####
18:21:29,431 INFO  [xxx] ['11555', '11556', '11557', '11558']
18:21:29,431 INFO  [xxx] Start8 #### CURSOR INFO ####
18:21:29,431 INFO  [xxx] [<DBUtils.SteadyDB.SteadyDBCursor instance at
0x01955710>]
18:21:29,431 INFO  [xxx] [<DBUtils.SteadyDB.SteadyDBConnection instance at
0x019555A8>]
********** 18:21:29,431 INFO  [xxx] [<pgdb.pgdbCursor instance at
0x0195AE18>]

What happened? How I can avoid the cursor changing? How to fix it in my
transaction?
I never ask for new cursor, I used same variable in all of my context
(self.Cur)... :-(

So what is the solution? Drop DBUtils? Or what?

Thanks for your help:
    dd
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From thebiggestbangtheory at gmail.com  Thu May 28 12:56:36 2009
From: thebiggestbangtheory at gmail.com (thebiggestbangtheory at gmail.com)
Date: Thu, 28 May 2009 09:56:36 -0700 (PDT)
Subject: newbie: popen question
References: <328e5cd4-bc4e-47bf-b8e2-91764351c525@g22g2000pra.googlegroups.com>
	<75004846-9f60-401f-9a7b-adbc28add28b@x31g2000prc.googlegroups.com> 
	<gvm079$asb$1@hoshi.visyn.net>
Message-ID: <662556cb-f2b4-4a6c-a612-176478612c12@q14g2000vbn.googlegroups.com>

On May 28, 5:31?am, Sebastian Wiesner <basti.wies... at gmx.net> wrote:
> <Sean DiZazzo ? Donnerstag, 28. Mai 2009 10:11>
>
> > Your best bet is to make sudo not ask for a password. ?:) ?If you
> > don't have the rights, then you can use pexpect to do what you want to
> > do. ?http://pexpect.sourceforge.net/pexpect.html
>
> > See the second example on that page.
>
> > child = pexpect.spawn('scp foo myn... at host.example.com:.')
> > child.expect ('Password:')
> > child.sendline (mypassword)
>
> The sudo password prompt is very configurable, so changing the configuration
> to allow execution without password input is really the best option.
>
> --
> Freedom is always the freedom of dissenters.
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (Rosa Luxemburg)

Thanks guys for helping out! very good answers :-)

Before I saw your answers, I tried the following,

output = subprocess.Popen(["sudo","-b", "code.sh", "arg1"],
stdout=subprocess.PIPE).communicate()[0]

This seemed to push the shell execution process to the background and
because my python program was invoked initially with sudo, it seems I
did not need to enter a passwd again.

Any comments about this..any issues that you see will crop up?

Thanks a ton again.





From castironpi at gmail.com  Thu May 28 13:53:17 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Thu, 28 May 2009 10:53:17 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de> 
	<02204669$0$25303$c3e8da3@news.astraweb.com>
	<kkb00q.g62@spenarnc.xs4all.nl> 
	<0039e85f$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <8cc46645-100a-46e4-9b7c-9dff7f1e2c18@z19g2000vbz.googlegroups.com>

On May 27, 11:07?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Wed, 27 May 2009 12:58:02 +0000, Albert van der Horst wrote:
>
> >>And how is reduce() supposed to know whether or not some arbitrary
> >>function is commutative?
>
> > Why would it or need it? A Python that understands the ``par'' keyword
> > is supposed to know it can play some tricks with optimizing reduce() if
> > the specific function is commutative.
>
> Fine. Move the smarts out of reduce() into the compiler. How is the
> compiler supposed to know if an arbitrary function is commutative?

Unit testing.


From trhaynes at gmail.com  Thu May 28 14:06:03 2009
From: trhaynes at gmail.com (trhaynes)
Date: Thu, 28 May 2009 11:06:03 -0700 (PDT)
Subject: py2app and OpenGL, "No module named util" in ctypes
Message-ID: <b09874da-5dcb-4b60-aae8-f430f1db5ba1@o20g2000vbh.googlegroups.com>

I'm trying to use py2app to package an OpenGL app, so first I tried to
build the example here

http://svn.pythonmac.org/py2app/py2app/trunk/examples/PyOpenGL/

and I get the error:

>  File "/opt/local/lib/python2.5/site-packages/PyOpenGL-3.0.0c1-py2.5.egg/OpenGL/platform/darwin.py", line 24, in <module>
>    import ctypes, ctypes.util
>ImportError: No module named util
>2009-05-28 13:55:06.819 lesson5[19965:10b] lesson5 Error
>2009-05-28 13:55:06.821 lesson5[19965:10b] lesson5 Error
>An unexpected error has occurred during execution of the main script
>
>ImportError: No module named util

But when I open up my python interactive interpreter and "import
ctypes.util", it works fine (using lesson5.app/Contents/MacOS/python,
too).

Thanks for the help.

-tom


From suruti94 at gmail.com  Thu May 28 14:09:02 2009
From: suruti94 at gmail.com (Mohan Parthasarathy)
Date: Thu, 28 May 2009 11:09:02 -0700
Subject: Seeking old post on developers who like IDEs vs developers who 
	like simple languages
In-Reply-To: <mff7e6-e43.ln1@satorlaser.homedns.org>
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
Message-ID: <89dd3da60905281109x100fb22bge52df90acf5c79c6@mail.gmail.com>

On Mon, May 18, 2009 at 12:31 AM, Ulrich Eckhardt
<eckhardt at satorlaser.com>wrote:

> Steve Ferg wrote:
> > On the one hand, there are developers who love big IDEs with lots of
> > features (code generation, error checking, etc.), and rely on them to
> > provide the high level of support needed to be reasonably productive
> > in heavy-weight languages (e.g. Java).
> >
> > On the other hand there are developers who much prefer to keep things
> > light-weight and simple.  They like clean high-level languages (e.g.
> > Python) which are compact enough that you can keep the whole language
> > in your head, and require only a good text editor to be used
> > effectively.
>
> This distinction is IMHO not correct. If you took a look at Java, you would
> notice that the core language syntax is much simpler than Python's. OTOH,
> if you add the standard libraries, you would soon see that Python's
> libraries are not as consistent (i.e. conformant to PEP8) as Java's.
>
> What makes up for Python's perceived usability problems though is the
> commandline parser that allows you to inspect the type of an object and its
> parts of it at runtime, in particular the docstrings are a treasure there.
>
> That said, an IDE that provides auto-completion (e.g. that gives you a list
> of available class members) is a good thing in Java, because you don't have
> to browse the documentation as often. With Python, that is impossible
> because there are no types bound to parameters, so any type that fits is
> allowed (duck typing).
>

I just downloaded the Aptana IDE which has Python support and I have not
tried it yet. But I remebered seeing this thread. Has anyone used the Aptana
IDE for Python development ?

thanks
mohan


>
> Uli
>
> --
> Sator Laser GmbH
> Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From davea at ieee.org  Thu May 28 14:15:57 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 28 May 2009 14:15:57 -0400
Subject: [pyunit] Only run one specific test
In-Reply-To: <87k542dtzq.fsf@vostro.rath.org>
References: <87k542dtzq.fsf@vostro.rath.org>
Message-ID: <4A1ED4DD.9020909@ieee.org>

Nikolaus Rath wrote:
> Hi,
>
> Consider these two files:
>
> ,---- mytest.py -----
> | #!/usr/bin/env python
> | import unittest
> | 
> | class myTestCase(unittest.TestCase):
> |     def test_foo(self):
> | 	pass
> | 
> | # Somehow important according to pyunit documentation
> | def suite():
> |     return unittest.makeSuite(myTestCase)
> `----
>
> ,---- runtest ---
> | #!/usr/bin/env python
> | import unittest
> | 
> | # Find and import tests
> | modules_to_test =  [ "mytest" ]
> | map(__import__, modules_to_test)
> | 
> | # Runs all tests in test/ directory
> | def suite():
> |     alltests = unittest.TestSuite()
> |     for name in modules_to_test:
> |         alltests.addTest(unittest.findTestCases(sys.modules[name]))
> |     return alltests
> | 
> | if __name__ == '__main__':
> |     unittest.main(defaultTest='suite')
> `----
>
>
> if I run runtest without arguments, it works. But according to runtest
> --help, I should also be able to do
>
> ,----
> | $ ./runtest mytest
> | Traceback (most recent call last):
> |   File "./runtest", line 20, in <module>
> |     unittest.main()
> |   File "/usr/lib/python2.6/unittest.py", line 816, in __init__
> |     self.parseArgs(argv)
> |   File "/usr/lib/python2.6/unittest.py", line 843, in parseArgs
> |     self.createTests()
> |   File "/usr/lib/python2.6/unittest.py", line 849, in createTests
> |     self.module)
> |   File "/usr/lib/python2.6/unittest.py", line 613, in loadTestsFromNames
> |     suites = [self.loadTestsFromName(name, module) for name in names]
> |   File "/usr/lib/python2.6/unittest.py", line 584, in loadTestsFromName
> |     parent, obj = obj, getattr(obj, part)
> | AttributeError: 'module' object has no attribute 'mytest'
> `----
>
>
> Why doesn't this work?
>
> Best,
>
>    -Nikolaus
>
>
>   
First, you're missing a    import sys in the runtest.py module.  Without 
that, it won't even start.

Now, I have no familiarity with unittest, but I took this as a 
challenge.  The way I read the code is that you need an explicit import 
of mytest if you're
going to specify a commandline of
    runtest mytest

So I'd add two lines to the beginning of  runtest.py:

import sys
import mytest





From descentspb at gmail.com  Thu May 28 14:17:20 2009
From: descentspb at gmail.com (Igor Katson)
Date: Thu, 28 May 2009 22:17:20 +0400
Subject: What is the purpose of "struct" and "array" modules
Message-ID: <4A1ED530.3080109@gmail.com>

I pretty much understand what they do, but what's the case of using 
these modules by example? Is it something like pickle, to store the data 
efficiently in files?


From bsk16 at case.edu  Thu May 28 14:19:50 2009
From: bsk16 at case.edu (Benjamin Kaplan)
Date: Thu, 28 May 2009 14:19:50 -0400
Subject: Seeking old post on developers who like IDEs vs developers who 
	like simple languages
In-Reply-To: <89dd3da60905281109x100fb22bge52df90acf5c79c6@mail.gmail.com>
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
	<89dd3da60905281109x100fb22bge52df90acf5c79c6@mail.gmail.com>
Message-ID: <ec96e1390905281119i33a00c17p6e5b7c5eb7c01d53@mail.gmail.com>

On Thu, May 28, 2009 at 2:09 PM, Mohan Parthasarathy <suruti94 at gmail.com>wrote:

>
>
> On Mon, May 18, 2009 at 12:31 AM, Ulrich Eckhardt <eckhardt at satorlaser.com
> > wrote:
>
>> Steve Ferg wrote:
>> > On the one hand, there are developers who love big IDEs with lots of
>> > features (code generation, error checking, etc.), and rely on them to
>> > provide the high level of support needed to be reasonably productive
>> > in heavy-weight languages (e.g. Java).
>> >
>> > On the other hand there are developers who much prefer to keep things
>> > light-weight and simple.  They like clean high-level languages (e.g.
>> > Python) which are compact enough that you can keep the whole language
>> > in your head, and require only a good text editor to be used
>> > effectively.
>>
>> This distinction is IMHO not correct. If you took a look at Java, you
>> would
>> notice that the core language syntax is much simpler than Python's. OTOH,
>> if you add the standard libraries, you would soon see that Python's
>> libraries are not as consistent (i.e. conformant to PEP8) as Java's.
>>
>> What makes up for Python's perceived usability problems though is the
>> commandline parser that allows you to inspect the type of an object and
>> its
>> parts of it at runtime, in particular the docstrings are a treasure there.
>>
>> That said, an IDE that provides auto-completion (e.g. that gives you a
>> list
>> of available class members) is a good thing in Java, because you don't
>> have
>> to browse the documentation as often. With Python, that is impossible
>> because there are no types bound to parameters, so any type that fits is
>> allowed (duck typing).
>>
>
> I just downloaded the Aptana IDE which has Python support and I have not
> tried it yet. But I remebered seeing this thread. Has anyone used the Aptana
> IDE for Python development ?
>

The "Aptana IDE" is just Eclipse (www.eclipse.org) with Aptana's plugins
installed (you can get the plugins using a normal eclipse build too). The
Python plugin they use is called PyDev (pydev.sourceforge.net). Look through
the archives for all the people using eclipse + pydev. There are lots of
them.


>
> thanks
> mohan
>
>
>>
>> Uli
>>
>> --
>> Sator Laser GmbH
>> Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From daniel.watrous at gmail.com  Thu May 28 14:23:35 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Thu, 28 May 2009 11:23:35 -0700 (PDT)
Subject: how to change response code in CGIHTTPServer.py
Message-ID: <2c86f050-8a1b-4124-9cc8-f6666d1bd7dc@s28g2000vbp.googlegroups.com>

Hello,

Python 2.5.2
WinXP

I'm using CGIHTTPServer.py and want to return a response code of 400
with a message in the event that the cgi script fails for some
reason.  I notice that
run_cgi(self):
executes this line of code,
self.send_response(200, "Script output follows")
which overwrites any headers that I print in my cgi.  Is there some
way to modify the response code without having to override
CGIHTTPServer.py?

Thanks,


From joshua at joshuakugler.com  Thu May 28 14:38:29 2009
From: joshua at joshuakugler.com (Joshua Kugler)
Date: Thu, 28 May 2009 10:38:29 -0800
Subject: How does Python's OOP feel?
References: <e137e8260905261946q5666c240m516b28d841c9970@mail.gmail.com>
Message-ID: <gvmln5$d47$1@ger.gmane.org>

> The good thing about python is : it 'tastes' like what it was being
> advertised

+1 QOTW




From roastie57 at gmail.com  Thu May 28 14:43:00 2009
From: roastie57 at gmail.com (Roastie)
Date: Thu, 28 May 2009 11:43:00 -0700 (PDT)
Subject: AOPython Question
Message-ID: <b5ae3174-ef46-452a-96df-c5018bbac31e@21g2000vbk.googlegroups.com>

I installed the AOPython module:

   % easy_install aopython

That left an aopython-1.0.3-py2.6.egg at
C:\mystuff\python\python_2.6.2\Lib\site-packages.

I entered the interpreter:

>>> import aopython
>>>

All is well.

But I was uncomfortable, since I was used to seeing directories
of Python code for modules in site-packages, so I decided
to read about eggs:
http://mrtopf.de/blog/python_zope/a-small-introduction-to-python-eggs/

The article told me to run:
    % easy_install aopython-1.0.3-py2.6.egg
The result was a long list of error messages and removal
of my egg, and Python could no longer use the AOPython module.

So, I'm looking for a better reference for telling me about eggs and
modules in site-packages.

Roastie
roastie57 at gmail.com


From wong_powah at yahoo.ca  Thu May 28 14:55:35 2009
From: wong_powah at yahoo.ca (powah)
Date: Thu, 28 May 2009 11:55:35 -0700 (PDT)
Subject: download all mib files from a web page
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
	<ad31d28e-1472-4da6-b704-820435947191@y7g2000yqa.googlegroups.com> 
	<Lo2dnbn72r-YCIDXnZ2dnUVZ_rmdnZ2d@pdx.net>
Message-ID: <339e1ee3-3fcf-4db7-9725-ee1bc9c94e68@o30g2000vbc.googlegroups.com>

On May 27, 3:37?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> powah wrote:
> > ...
> > I fixed one error, now if the filename is misspelled, how to ignore
> > the error and continue?
>
> You really should go through the tutorial. ?It will explain this and
> other important things well. ?But, since I'm feeling generous:
>
> Replace this:> ? ? u=urllib2.urlopen(link)
> > ? ? p=u.read()
> > ? ? open(filename,"w").write(p)
>
> with this:
> ? ? ? ?try:
> ? ? ? ? ? ?u = urllib2.urlopen(link)
> ? ? ? ? ? ?p = u.read()
> ? ? ? ?except urllib2.HTTPError:
> ? ? ? ? ? ?pass
> ? ? ? ?else:
> ? ? ? ? ? ?dest = open(filename, "w")
> ? ? ? ? ? ?dest.write(p)
> ? ? ? ? ? ?dest.close()
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

Thanks!


From norseman at hughes.net  Thu May 28 15:03:23 2009
From: norseman at hughes.net (norseman)
Date: Thu, 28 May 2009 12:03:23 -0700
Subject: Python, Tkinter and popen problem
In-Reply-To: <gvlnh2$n7t$02$1@news.t-online.com>
References: <mailman.803.1243448972.8015.python-list@python.org>	<gvk2br$6bg$03$1@news.t-online.com>	<mailman.811.1243469678.8015.python-list@python.org>
	<gvlnh2$n7t$02$1@news.t-online.com>
Message-ID: <4A1EDFFB.1060400@hughes.net>

Peter Otten wrote:
> norseman wrote:
> 
>> Peter Otten wrote:
>>> norseman wrote:
>>>
>>>> This was sent 5/19/09 and as yet has received no comments.
>>>> I'm resending just in case a new reader might have an answer.
>>> If you had posted two tiny scripts demonstrating your problem instead of
>>> the longwinded explanation I might have tinkered.
> 
>> That's one of the problems - with Tkinter you don't get tiny files. :)
> 
> Nonsense. The minimal Tkinter program is
> 
> from Tkinter import Tk
> root = Tk()
> root.mainloop()
> 
> The idea is that you remove everything but the parts relevant to your 
> problem (or build a toy example from scratch). This makes it easier for a 
> non-guru to verify a potential answer. That non-guru might even be yourself, 
> by the way.
> 
>> NOTE: program runs perfectly on both Linux and Windows XP Pro when run 
>> from the keyboard. But not from another python program that wants the 
>> phone line connected. (stdin/stdout)  Gee... There is never a County 
>> Lineman when needed is there Glen? :)
> 
> It's not clear why you need to start the GUI at all as you seem to have 
> control over boths scripts.
> 
> Peter
> 
=========================================================================
To cover two responses at once:

Response from MRAB  google at mrabarnett.plus.com

> [snip]
>
> You're more likely to get help if you provide the minimum code that
> demonstrates the problem.
>
> Anyway, your original post said that you're running the child with
> os.popen. The documentation says:
>
> """Open a pipe to or from command. The return value is an open file
> object connected to the pipe, which can be read or written depending on
> whether mode is 'r' (default) or 'w'."""
>

Yes - that is what the docs say.
They also say flush() is supposed to work. The flush() designed for the
file type being used. (I think I counted six different flush() in the
lib.pdf for python 2.5.2...)

> In other words, it's one-way.
>
> Are you really using os.popen and not, say, os.popen2?
>
> (Providing actual code would make this clear.


I have tried both and Popen2.popen2().
os.popen runs both way, contrary to docs.

# master.py
import os
#                both lines work same
#xx= os.popen("/mnt/mass/py/z6.py").readlines()
xx= os.popen("/mnt/mass/py/z6.py",'r',1).readlines()
#                I had hoped small buffer would force a sync (flush())
#                No such luck.
for i in xx:
   print "\t"+i[:-1]

#"""
#                              end of file

The "\t" is to prove where the screen output came from.

========================================================
========================================================

 From Peter __peter__ at web.de

> Nonsense. The minimal Tkinter program is
>
> from Tkinter import Tk
> root = Tk()
> root.mainloop()
>

Just to be clear, that's as much a minimal program as

/* shp2dxfu.c
    purpose: To convert shp files to dxf files. (GNU C Unix version)
*/
#ifdef MSDOS
#include <stdio.h>
#include <math.h>
#include <fcntl.h>
#include <stat.h>
#include <io.h>
#include <alloc.h>
#include <stdlib.h>
#include <string.h>
#include <mem.h>
#endif

#ifdef UNIX
#include <stdio.h>
#include <math.h>
#include <fcntl.h>
#include "stat.h"
#include <malloc.h>
#include <stdlib.h>
#include <string.h>
#define O_BINARY 0x00
#define S_IREAD 0400
#endif

int main(argc,argv)
int argc;
char *argv[];
{
/* */
}
and both accomplish absolutely nothing :)

> The idea is that you remove everything but the parts relevant to your
> problem (or build a toy example from scratch). This makes it easier for a
> non-guru to verify a potential answer. That non-guru might even be yourself,
> by the way.

# child.py
import os
import sys
import array
from array import *
import Tkinter
from Tkinter import *
from Tkconstants import *
#
def AttPanel():

   def PlaceIt():
       sys.stdout.write( "Switching to ESRI for placement\n")
       sys.stdout.flush()
       sys.stdout.flush()

       #print "Switching to ESRI for placement"
       ##zatt= bl_x+bl_y+acrs+c1+c2[2:]+c3[2:]+'\n'
       zatt='123456\n'
       #print zatt
       sys.stdout.write(zatt)
       sys.stdout.flush()

       #set system variable to zatt
       root.withdraw()
       #root.iconify()
       while raw_input() != ' ':
         pass
       root.deiconify()

   def CRASH():
     print "\nCRASH Initiated\n"
     exit(1)
#
   root = Tk()

   LU = Frame(root)
   LU.pack(fill="both", expand=1)

   f1 = Frame(LU, relief = GROOVE, bd = 2)
   f1.grid(row = 0, column = 0)
   Button(f1, width= 45, state= DISABLED).grid(row= 0, column= 0)
   Button(f1, text= "Place Attribute", fg= "black", bg= "green",
          anchor= N, command = PlaceIt).grid(row = 0, column = 1)
   Button(f1, width= 45, state= DISABLED).grid(row= 0, column= 2)
   Button(f1, text= "Cancel Attributing", fg= "white", bg= "red",
          anchor= E, command= CRASH).grid(row = 0, column = 3)
   f1.pack()
   #
   root.mainloop()
#---------------#

if __name__ == "__main__":
   while TRUE:
     AttPanel()

#                              end of file


...(snip)
> It's not clear why you need to start the GUI at all as you seem to have
> control over boths scripts.
>
> Peter


Because the master has control over the production line and the child
(one stop along the way) has the purpose of pre-editing the visually
displayed but manually entered data which in turn greatly reduces post
processing problems.



The direct question comes back to:
How does one force a sync or flush() to take effect in Python with
Tkinter in use? Or just in Python period. The keyword being force.

The .force() above has absolutely no visually discernible effect during
program calling program.

Running child direct from keyboard yields correct results.
Calling child from master shows problem.

   In case you missed it - <Place Attribute> - hides widget,
                           <spacebar>        - returns widget,
                           (Cancel ---     > - exits child.
   At least on my machines (Linux and Windows XP Pro).


Steve



From Nikolaus at rath.org  Thu May 28 15:19:50 2009
From: Nikolaus at rath.org (Nikolaus Rath)
Date: Thu, 28 May 2009 15:19:50 -0400
Subject: [pyunit] Only run one specific test
References: <87k542dtzq.fsf@vostro.rath.org>
	<mailman.851.1243534574.8015.python-list@python.org>
Message-ID: <87skipc9wp.fsf@vostro.rath.org>

Dave Angel <davea at ieee.org> writes:
> Nikolaus Rath wrote:
>> Hi,
>>
>> Consider these two files:
>>
>> ,---- mytest.py -----
>> | #!/usr/bin/env python
>> | import unittest
>> | | class myTestCase(unittest.TestCase):
>> |     def test_foo(self):
>> | 	pass
>> | | # Somehow important according to pyunit documentation
>> | def suite():
>> |     return unittest.makeSuite(myTestCase)
>> `----
>>
>> ,---- runtest ---
>> | #!/usr/bin/env python
>> | import unittest
>> | | # Find and import tests
>> | modules_to_test =  [ "mytest" ]
>> | map(__import__, modules_to_test)
>> | | # Runs all tests in test/ directory
>> | def suite():
>> |     alltests = unittest.TestSuite()
>> |     for name in modules_to_test:
>> |         alltests.addTest(unittest.findTestCases(sys.modules[name]))
>> |     return alltests
>> | | if __name__ == '__main__':
>> |     unittest.main(defaultTest='suite')
>> `----
>>
>>
>> if I run runtest without arguments, it works. But according to runtest
>> --help, I should also be able to do
>>
>> ,----
>> | $ ./runtest mytest
>> | Traceback (most recent call last):
>> |   File "./runtest", line 20, in <module>
>> |     unittest.main()
>> |   File "/usr/lib/python2.6/unittest.py", line 816, in __init__
>> |     self.parseArgs(argv)
>> |   File "/usr/lib/python2.6/unittest.py", line 843, in parseArgs
>> |     self.createTests()
>> |   File "/usr/lib/python2.6/unittest.py", line 849, in createTests
>> |     self.module)
>> |   File "/usr/lib/python2.6/unittest.py", line 613, in loadTestsFromNames
>> |     suites = [self.loadTestsFromName(name, module) for name in names]
>> |   File "/usr/lib/python2.6/unittest.py", line 584, in loadTestsFromName
>> |     parent, obj = obj, getattr(obj, part)
>> | AttributeError: 'module' object has no attribute 'mytest'
>> `----
>>
>>
>> Why doesn't this work?
>>
>> Best,
>>
>>    -Nikolaus
>>
>>
>>   
> First, you're missing a    import sys in the runtest.py module.
> Without that, it won't even start.

Sorry, I must have accidentally deleted the line when I deleted empty
lines to make the example more compact.


> Now, I have no familiarity with unittest, but I took this as a
> challenge.  The way I read the code is that you need an explicit
> import of mytest if you're
> going to specify a commandline of
>    runtest mytest
>
> So I'd add two lines to the beginning of  runtest.py:
>
> import sys
> import mytest

Yes, that works indeed. But in practice the modules_to_import list is
filled by parsing the contents of a test/*.py directory. That's why I
import dynamically with __import__.

Nevertheless, you got me on the right track. After I explicitly added
the modules to the global namespace (globals()["mytest"] =
__import__("mytest")), it works fine. Thx!


Best,

   -Nikolaus

-- 
 ?Time flies like an arrow, fruit flies like a Banana.?

  PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6  02CF A9AD B7F8 AE4E 425C


From debatem1 at gmail.com  Thu May 28 15:21:24 2009
From: debatem1 at gmail.com (CTO)
Date: Thu, 28 May 2009 12:21:24 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de> 
	<02204669$0$25303$c3e8da3@news.astraweb.com>
	<kkb00q.g62@spenarnc.xs4all.nl> 
	<0039e85f$0$9673$c3e8da3@news.astraweb.com>
	<8cc46645-100a-46e4-9b7c-9dff7f1e2c18@z19g2000vbz.googlegroups.com>
Message-ID: <f3acf3a8-c565-47d0-a987-392e59fc497d@r3g2000vbp.googlegroups.com>

On May 28, 1:53?pm, Aaron Brady <castiro... at gmail.com> wrote:
> On May 27, 11:07?pm, Steven D'Aprano <st... at REMOVE-THIS-
>
> cybersource.com.au> wrote:
> > On Wed, 27 May 2009 12:58:02 +0000, Albert van der Horst wrote:
>
> > >>And how is reduce() supposed to know whether or not some arbitrary
> > >>function is commutative?
>
> > > Why would it or need it? A Python that understands the ``par'' keyword
> > > is supposed to know it can play some tricks with optimizing reduce() if
> > > the specific function is commutative.
>
> > Fine. Move the smarts out of reduce() into the compiler. How is the
> > compiler supposed to know if an arbitrary function is commutative?
>
> Unit testing.

I think this kind of gets to the heart of it, here- parallelization
is not a toy, runs with scissors, and will eat your dog, but so will
everything else if you don't know what you're doing. I just don't
see this as being a valid argument- maybe I'm wrong.

In the spirit of continuing to be wrong, would it be possible to
just fork off and synchronize the passed-in variables at the end
of the block via a container in shared memory? That sounds to me
like the simple, safe route, if a route must be taken.

Geremy Condra


From kyosohma at gmail.com  Thu May 28 16:10:24 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 28 May 2009 13:10:24 -0700 (PDT)
Subject: AOPython Question
References: <b5ae3174-ef46-452a-96df-c5018bbac31e@21g2000vbk.googlegroups.com>
Message-ID: <f1dde0e2-bb2b-42ce-bad5-843da35d8892@b1g2000vbc.googlegroups.com>

On May 28, 1:43?pm, Roastie <roasti... at gmail.com> wrote:
> I installed the AOPython module:
>
> ? ?% easy_install aopython
>
> That left an aopython-1.0.3-py2.6.egg at
> C:\mystuff\python\python_2.6.2\Lib\site-packages.
>
> I entered the interpreter:
>
> >>> import aopython
>
> All is well.
>
> But I was uncomfortable, since I was used to seeing directories
> of Python code for modules in site-packages, so I decided
> to read about eggs:http://mrtopf.de/blog/python_zope/a-small-introduction-to-python-eggs/
>
> The article told me to run:
> ? ? % easy_install aopython-1.0.3-py2.6.egg
> The result was a long list of error messages and removal
> of my egg, and Python could no longer use the AOPython module.
>
> So, I'm looking for a better reference for telling me about eggs and
> modules in site-packages.
>
> Roastie
> roasti... at gmail.com

The first way to do it is usually the preferred method. When you do

easy_install somePackage

the easy_install script will try to find the package on PyPI and
download the latest version. If you do the latter, you are telling
easy_install to look for that specific version. If you mis-spell the
version slightly, then you will probably have issues. I am guessing
that is why you received those error messages.

See the easy install official docs:

http://peak.telecommunity.com/DevCenter/EasyInstall

- Mike


From usenet at janc.invalid  Thu May 28 16:12:14 2009
From: usenet at janc.invalid (JanC)
Date: Thu, 28 May 2009 20:12:14 +0000 (UTC)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<pan.2009.05.26.05.01.13@REMOVE.THIS.cybersource.com.au>
	<mailman.738.1243324787.8015.python-list@python.org>
Message-ID: <gvmr6u$2dc$1@news.albasani.net>

Hendrik van Rooyen wrote:

> When ssh- ing I have been using vim, painfully. Must look at nano - sounds good.
> I really miss Brief.

Or try 'joe'.


-- 
JanC


From kyosohma at gmail.com  Thu May 28 16:12:36 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 28 May 2009 13:12:36 -0700 (PDT)
Subject: AOPython Question
References: <b5ae3174-ef46-452a-96df-c5018bbac31e@21g2000vbk.googlegroups.com>
	<f1dde0e2-bb2b-42ce-bad5-843da35d8892@b1g2000vbc.googlegroups.com>
Message-ID: <691f442f-5250-404d-82ef-3524e250c132@n19g2000vba.googlegroups.com>

On May 28, 3:10?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On May 28, 1:43?pm, Roastie <roasti... at gmail.com> wrote:
>
>
>
> > I installed the AOPython module:
>
> > ? ?% easy_install aopython
>
> > That left an aopython-1.0.3-py2.6.egg at
> > C:\mystuff\python\python_2.6.2\Lib\site-packages.
>
> > I entered the interpreter:
>
> > >>> import aopython
>
> > All is well.
>
> > But I was uncomfortable, since I was used to seeing directories
> > of Python code for modules in site-packages, so I decided
> > to read about eggs:http://mrtopf.de/blog/python_zope/a-small-introduction-to-python-eggs/
>
> > The article told me to run:
> > ? ? % easy_install aopython-1.0.3-py2.6.egg
> > The result was a long list of error messages and removal
> > of my egg, and Python could no longer use the AOPython module.
>
> > So, I'm looking for a better reference for telling me about eggs and
> > modules in site-packages.
>
> > Roastie
> > roasti... at gmail.com
>
> The first way to do it is usually the preferred method. When you do
>
> easy_install somePackage
>
> the easy_install script will try to find the package on PyPI and
> download the latest version. If you do the latter, you are telling
> easy_install to look for that specific version. If you mis-spell the
> version slightly, then you will probably have issues. I am guessing
> that is why you received those error messages.
>
> See the easy install official docs:
>
> http://peak.telecommunity.com/DevCenter/EasyInstall
>
> - Mike

I forgot to mention, but I've found that using a virtualenv for
testing new modules is very helpful and you don't end up with lots of
junk entries in your system path. Check it out too: http://pypi.python.org/pypi/virtualenv

- Mike


From piet at cs.uu.nl  Thu May 28 16:28:35 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Thu, 28 May 2009 22:28:35 +0200
Subject: what I would like python.el to do (and maybe it does)
References: <mailman.714.1243247520.8015.python-list@python.org>
	<85ljolfgaa.fsf@agentultra.com>
Message-ID: <m2prdt2cr0.fsf@cs.uu.nl>

>>>>> J Kenneth King <james at agentultra.com> (JKK) wrote:

>JKK> I find that it does work, but unlike SLIME for lisp, it just imports the statement.

>JKK> It confused me at first, but basically the interpreter doesn't provide
>JKK> any feedback to emacs.

>JKK> Try opening a python source file (start python-mode if you don't have
>JKK> an autoload hook) and do C-c C-z to bring up the Python
>JKK> interpreter. Type in a simple assignment statement (like "a = 1 + 2"
>JKK> without the quotes) into the source file. Then just C-c C-c as
>JKK> usual. I never get any feedback. Just C-x o to the interpreter and
>JKK> print out the variable you just defined. It should be there.

What kind of feedback do you expect?
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From nad at acm.org  Thu May 28 16:40:18 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 28 May 2009 13:40:18 -0700
Subject: py2app and OpenGL, "No module named util" in ctypes
References: <b09874da-5dcb-4b60-aae8-f430f1db5ba1@o20g2000vbh.googlegroups.com>
Message-ID: <nad-8E8AF2.13401828052009@news.gmane.org>

In article 
<b09874da-5dcb-4b60-aae8-f430f1db5ba1 at o20g2000vbh.googlegroups.com>,
 trhaynes <trhaynes at gmail.com> wrote:
> I'm trying to use py2app to package an OpenGL app [...]

You might try asking on the pythonmac-sig list: more py2app users there 
most likely.

http://mail.python.org/mailman/listinfo/pythonmac-sig
[or]
http://dir.gmane.org/gmane.comp.python.apple

-- 
 Ned Deily,
 nad at acm.org



From google at mrabarnett.plus.com  Thu May 28 16:44:16 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 28 May 2009 21:44:16 +0100
Subject: Python, Tkinter and popen problem
In-Reply-To: <4A1EDFFB.1060400@hughes.net>
References: <mailman.803.1243448972.8015.python-list@python.org>	<gvk2br$6bg$03$1@news.t-online.com>	<mailman.811.1243469678.8015.python-list@python.org>	<gvlnh2$n7t$02$1@news.t-online.com>
	<4A1EDFFB.1060400@hughes.net>
Message-ID: <4A1EF7A0.5090407@mrabarnett.plus.com>

norseman wrote:
[snip]
> I have tried both and Popen2.popen2().
> os.popen runs both way, contrary to docs.
> 
> # master.py
> import os
> #                both lines work same
> #xx= os.popen("/mnt/mass/py/z6.py").readlines()
> xx= os.popen("/mnt/mass/py/z6.py",'r',1).readlines()

readlines() returns only when all the lines have been read, which is
when the child quits and the pipe closes. Try reading only one line at a
time. When the pipe closes the readline() will return ''.

> #                I had hoped small buffer would force a sync (flush())
> #                No such luck.
> for i in xx:
>   print "\t"+i[:-1]
> 
> #"""
> #                              end of file
> 
> The "\t" is to prove where the screen output came from.
> 
> ========================================================
> ========================================================
> 
>  From Peter __peter__ at web.de
> 
>> Nonsense. The minimal Tkinter program is
>>
>> from Tkinter import Tk
>> root = Tk()
>> root.mainloop()
>>
> 
> Just to be clear, that's as much a minimal program as
> 
[snip]
> # child.py
> import os
> import sys
> import array
> from array import *
> import Tkinter
> from Tkinter import *
> from Tkconstants import *
> #
> def AttPanel():
> 
>   def PlaceIt():
>       sys.stdout.write( "Switching to ESRI for placement\n")
>       sys.stdout.flush()
>       sys.stdout.flush()

No need to flush twice in a row.

> 
>       #print "Switching to ESRI for placement"
>       ##zatt= bl_x+bl_y+acrs+c1+c2[2:]+c3[2:]+'\n'
>       zatt='123456\n'
>       #print zatt
>       sys.stdout.write(zatt)
>       sys.stdout.flush()
> 
>       #set system variable to zatt
>       root.withdraw()
>       #root.iconify()
>       while raw_input() != ' ':
>         pass
>       root.deiconify()
> 
>   def CRASH():
>     print "\nCRASH Initiated\n"
>     exit(1)
> #
>   root = Tk()
> 
>   LU = Frame(root)
>   LU.pack(fill="both", expand=1)
> 
>   f1 = Frame(LU, relief = GROOVE, bd = 2)
>   f1.grid(row = 0, column = 0)
>   Button(f1, width= 45, state= DISABLED).grid(row= 0, column= 0)
>   Button(f1, text= "Place Attribute", fg= "black", bg= "green",
>          anchor= N, command = PlaceIt).grid(row = 0, column = 1)
>   Button(f1, width= 45, state= DISABLED).grid(row= 0, column= 2)
>   Button(f1, text= "Cancel Attributing", fg= "white", bg= "red",
>          anchor= E, command= CRASH).grid(row = 0, column = 3)
>   f1.pack()
>   #
>   root.mainloop()
> #---------------#
> 
> if __name__ == "__main__":
>   while TRUE:
>     AttPanel()
> 


From john.center at villanova.edu  Thu May 28 16:47:20 2009
From: john.center at villanova.edu (John Center)
Date: Thu, 28 May 2009 13:47:20 -0700 (PDT)
Subject: Problem building 64-bit python 2.6.2 on Solaris 10
Message-ID: <b53cac20-3d5f-4b39-ad2c-daf954ab39d7@s28g2000vbp.googlegroups.com>

Hi,

I'm trying to build python 2.6.2 on Solaris 10 (SPARC 64), using Sun
Studio 12, but I'm having a few problems getting a clean build.  The
python configure options are:

with_gcc=no
with_universal_archs=64-bit
with_cxx_main="CC -m64"

The first problem I'm having is _ssl.so not building:

cc -m64 -xcode=pic32 -DNDEBUG -g -xs -xtarget=ultraT1 -xarch=sparcvis2
-m64 -mt
-xcode=pic32 -xmemalign=8s -xpagesize=default -I. -I/opt/ws/dists/
Python-2.6.2/.
/Include -I. -IInclude -I./Include -I/opt/db/include -I/opt/tcl8/
include -I/opt/
openssl/include -I/opt/gnu/include -I/opt/local/include -I/usr/sfw/
include -I/usr/include -I/usr/local/include -I/opt/ws/dists/
Python-2.6.2/Include -I/opt/ws/dists/Python-2.6.2 -c /opt/ws/dists/
Python-2.6.2/Modules/_ssl.c -o build/temp.solaris-2.10-sun4v-2.6/opt/
ws/dists/Python-2.6.2/Modules/_ssl.o
"/opt/ws/dists/Python-2.6.2/Modules/_ssl.c", line 1119: warning:
statement not reached
cc -m64 -G build/temp.solaris-2.10-sun4v-2.6/opt/ws/dists/Python-2.6.2/
Modules/_ssl.o -L/opt/openssl/lib/sparcv9 -L/opt/db/lib/sparcv9 -L/opt/
gnu/lib/sparcv9 -L
/opt/local/lib/sparcv9 -L/usr/sfw/lib/sparcv9 -L/usr/lib/sparcv9 -L/
usr/local/lib -L. -R/opt/db/lib/sparcv9 -R/opt/gnu/lib/sparcv9 -R/opt/
local/lib/sparcv9 -R/usr/sfw/lib/sparcv9 -R/usr/lib/sparcv9 -lssl -
lcrypto -lpython2.6 -o build/lib.so
laris-2.10-sun4v-2.6/_ssl.so

*** WARNING: renaming "_ssl" since importing it failed: ld.so.1:
python: fatal: libssl.so.0.9.8: open failed: No such file or directory

I have the openssl include & 64-bit libraries in the paths shown
above, so why this doesn't work?  What am I missing?


My next problem is building the ctypes module:

cc -m64 -xcode=pic32 -DNDEBUG -g -xs -xtarget=ultraT1 -xarch=sparcvis2
-m64 -mt
-xcode=pic32 -xmemalign=8s -xpagesize=default -I. -I/opt/ws/dists/
Python-2.6.2/.
/Include -Ibuild/temp.solaris-2.10-sun4v-2.6/libffi/include -Ibuild/
temp.solaris
-2.10-sun4v-2.6/libffi -I/opt/ws/dists/Python-2.6.2/Modules/_ctypes/
libffi/src -
I. -IInclude -I./Include -I/opt/db/include -I/opt/tcl8/include -I/opt/
openssl/include -I/opt/gnu/include -I/opt/local/include -I/usr/sfw/
include -I/usr/include
-I/usr/local/include -I/opt/ws/dists/Python-2.6.2/Include -I/opt/ws/
dists/Python
-2.6.2 -c /opt/ws/dists/Python-2.6.2/Modules/_ctypes/libffi/src/sparc/
v8.S -o build/temp.solaris-2.10-sun4v-2.6/opt/ws/dists/Python-2.6.2/
Modules/_ctypes/libffi
/src/sparc/v8.o

/opt/ws/tools/SUNWspro/prod/bin/fbe: "/opt/ws/tmp/dists/cpp0AAA.
19506.DfaqgM", l
ine 438: error: detect global register use not covered .register
pseudo-op
/opt/ws/tools/SUNWspro/prod/bin/fbe: "/opt/ws/tmp/dists/cpp0AAA.
19506.DfaqgM", l
ine 456: error: detect global register use not covered .register
pseudo-op
cc: assembler failed for /opt/ws/dists/Python-2.6.2/Modules/_ctypes/
libffi/src/s
parc/v8.S

I think the problem is it should be built with v9.S for 64-bit, not
v8.S.  Is that correct?  If so, how do I get it to use the right one?

Any help would be greatly appreciated.

    -John


From db3l.net at gmail.com  Thu May 28 17:00:08 2009
From: db3l.net at gmail.com (David Bolen)
Date: Thu, 28 May 2009 17:00:08 -0400
Subject: AOPython Question
References: <b5ae3174-ef46-452a-96df-c5018bbac31e@21g2000vbk.googlegroups.com>
Message-ID: <m2eiu9lz8n.fsf@valheru.db3l.homeip.net>

Roastie <roastie57 at gmail.com> writes:

> I installed the AOPython module:
>
>    % easy_install aopython
>
> That left an aopython-1.0.3-py2.6.egg at
> C:\mystuff\python\python_2.6.2\Lib\site-packages.

An egg is basically a ZIP file with a specific structure (you can
inspect it with common ZIP tools).  Depending on the package
easy_install is installing, it may be considered safe to install as a
single file (which Python does support importing files from).

I tend to prefer to have an actual unpacked tree myself.  If you use
the "-Z" option to easy_install, you can force it to always unpack any
eggs when installing them.

Alternatively, if you've already got the single egg, you can always
unzip it yourself.  Just rename it temporarily and unzip it into a
directory named exactly the same as the single egg file was.

-- David


From ldo at geek-central.gen.new_zealand  Thu May 28 17:04:39 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 29 May 2009 09:04:39 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<gvljmv$8hg$5@lust.ihug.co.nz>
	<003a5518$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <gvmu98$25d$1@lust.ihug.co.nz>

In message <003a5518$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano 
wrote:

> On Thu, 28 May 2009 20:58:07 +1200, Lawrence D'Oliveiro wrote:
> 
>> In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano
>> wrote:
>> 
>>> A good UI standard should mean that:
>>> 
>>> * all functionality should be discoverable without reading the manual;
>> 
>> Which means no scripting languages are allowed?
> 
> "Should", not "must".

If you meant "may or may not", why don't you say "may or may not"?



From ldo at geek-central.gen.new_zealand  Thu May 28 17:07:03 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 29 May 2009 09:07:03 +1200
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
	<gvlppt$hk0$1@news.lysator.liu.se>
Message-ID: <gvmudo$25d$2@lust.ihug.co.nz>

In message <gvlppt$hk0$1 at news.lysator.liu.se>, Thomas Bellman wrote:

> Speaking as a sysadmin, running applications for production,
> programs not using SO_REUSEADDR should be taken out and shot.

> Not using SO_REUSEADDR means forcing a service interruption of
> half an hour (IIRC) if for some reason the service must be
> restarted, or having to reboot the entire machine.

No, you do not recall correctly. And anybody wanting to reboot a machine to 
work around a "problem" like that should be taken out and shot.



From norseman at hughes.net  Thu May 28 17:25:48 2009
From: norseman at hughes.net (norseman)
Date: Thu, 28 May 2009 14:25:48 -0700
Subject: py2app and OpenGL, "No module named util" in ctypes
In-Reply-To: <nad-8E8AF2.13401828052009@news.gmane.org>
References: <b09874da-5dcb-4b60-aae8-f430f1db5ba1@o20g2000vbh.googlegroups.com>
	<nad-8E8AF2.13401828052009@news.gmane.org>
Message-ID: <4A1F015C.2020205@hughes.net>

Ned Deily wrote:
> In article 
> <b09874da-5dcb-4b60-aae8-f430f1db5ba1 at o20g2000vbh.googlegroups.com>,
>  trhaynes <trhaynes at gmail.com> wrote:
>> I'm trying to use py2app to package an OpenGL app [...]
> 
> You might try asking on the pythonmac-sig list: more py2app users there 
> most likely.
> 
> http://mail.python.org/mailman/listinfo/pythonmac-sig
> [or]
> http://dir.gmane.org/gmane.comp.python.apple
> 
=========================
trhaynes;

Re: py2app and OpenGL, "No module named util" in ctypes

That's funny:

import ctypes
help(ctypes)
    --- start screen dump ---
Help on package ctypes:

NAME
     ctypes - create and manipulate C data types in Python

FILE
     /usr/local/lib/python2.5/ctypes/__init__.py

MODULE DOCS
     /mnt/mass/py/man/py-chm/module-ctypes.html

PACKAGE CONTENTS
     _endian
     macholib (package)
     test (package)
     util                           <<<<<-------------
     wintypes

CLASSES
     __builtin__.object
         CDLL
             PyDLL
         LibraryLoader
    --- end screen dump ---

I assume py2app can't find/load it???  I wasn't in at the start of this 
thread.

If you do need it,

import ctypes
from ctypes import util

I know the *import ctypes* line is supposed to be *not needed*, but I 
find Python works more as expected with it.


I also assume you have seen .../pythonXX/distutils and dist.pdf?  Just 
in case you have not - take a look. Supposed to be how to package one's 
stuff for distribution.

At least with python 2.5.2
on Linux Slackware 10.2
Today is: 20090528



Steve


From mccredie at gmail.com  Thu May 28 17:39:30 2009
From: mccredie at gmail.com (Matimus)
Date: Thu, 28 May 2009 14:39:30 -0700 (PDT)
Subject: What is the purpose of "struct" and "array" modules
References: <mailman.852.1243534646.8015.python-list@python.org>
Message-ID: <65b44dac-a0a1-4a89-ab07-9492230f4a3c@c18g2000prh.googlegroups.com>

On May 28, 11:17?am, Igor Katson <descent... at gmail.com> wrote:
> I pretty much understand what they do, but what's the case of using
> these modules by example? Is it something like pickle, to store the data
> efficiently in files?

For one it provides a mechanism for reading and writing arbitrary file
formats. For example, suppose you wanted to parse a PNG image using
python code. It is likely that that format is described in its
specification using C data structures (I've never looked at PNG format
specifically). In python you can't just read out some data and copy it
directly into a data structure. You could use the struct module
though.

It really has nothing to do with serializing python data structures.
It is (mostly) about data formats and objects defined in other
languages.

Matt


From Scott.Daniels at Acm.Org  Thu May 28 17:51:22 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 28 May 2009 14:51:22 -0700
Subject: What is the purpose of "struct" and "array" modules
In-Reply-To: <mailman.852.1243534646.8015.python-list@python.org>
References: <mailman.852.1243534646.8015.python-list@python.org>
Message-ID: <qNqdnUV58JdgmILXnZ2dnUVZ_sCdnZ2d@pdx.net>

Igor Katson wrote:
> I pretty much understand what they do, but what's the case of using 
> these modules by example? Is it something like pickle, to store the data 
> efficiently in files?

Mostly it is for access to specific binary data structures.
If you know a particular file format, you can read it with
a combination of struct and array, ans similarly can write
in that format by such use.  So like pickle in a way, but
pickle is talking Python-to-Python, while things built with
these will be more likely Python-to-wire or wire-to-Python
when talking over a TCP/IP connection, or Python-to-file
and file-to-Python, where the other user of the file may be
a completely different program.

--Scott David Daniels
Scott.Daniels at Acm.Org


From jeffedwa at gmail.com  Thu May 28 17:54:30 2009
From: jeffedwa at gmail.com (jeffFromOz)
Date: Thu, 28 May 2009 14:54:30 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com>

On May 26, 10:07?pm, Lacrima <Lacrima.Ma... at gmail.com> wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

No one mentioned textmate either  . a brilliant text editor with
python templates, and bundles, syntax highlighting, etc.  We use
wingIDE for debugging and it seems fine, except for the weird way it
corrupts the displayed text.


From martin at v.loewis.de  Thu May 28 18:03:24 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Fri, 29 May 2009 00:03:24 +0200
Subject: Problem building 64-bit python 2.6.2 on Solaris 10
In-Reply-To: <b53cac20-3d5f-4b39-ad2c-daf954ab39d7@s28g2000vbp.googlegroups.com>
References: <b53cac20-3d5f-4b39-ad2c-daf954ab39d7@s28g2000vbp.googlegroups.com>
Message-ID: <4a1f0a2c$0$30886$9b622d9e@news.freenet.de>

> I think the problem is it should be built with v9.S for 64-bit, not
> v8.S.  Is that correct?  If so, how do I get it to use the right one?

The Solaris dynamic loader can't find it. Set LD_LIBRARY_PATH or
LD_RUN_PATH appropriately, or use crle(8).

Regards,
Martin


From norseman at hughes.net  Thu May 28 18:24:49 2009
From: norseman at hughes.net (norseman)
Date: Thu, 28 May 2009 15:24:49 -0700
Subject: What text editor is everyone using for Python
In-Reply-To: <4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com>
Message-ID: <4A1F0F31.6050703@hughes.net>

jeffFromOz wrote:
> On May 26, 10:07 pm, Lacrima <Lacrima.Ma... at gmail.com> wrote:
>> I am new to python.
>> And now I am using trial version of Wing IDE.
>> But nobody mentioned it as a favourite editor.
>> So should I buy it when trial is expired or there are better choices?
> 
> No one mentioned textmate either  . a brilliant text editor with
> python templates, and bundles, syntax highlighting, etc.  We use
> wingIDE for debugging and it seems fine, except for the weird way it
> corrupts the displayed text.
===========================

BOTTOM LINES:

Whatever they learned on.
Whatever they are trying out at the moment (for the adventurous types)


Suggestion:
Take a look at the top two most used OS you use and learn the default 
(most often available) text editors that come with them.


The deep quiet voice of experience yells:
Specialty items are seldom there when you need them!


Steve


From pavlovevidence at gmail.com  Thu May 28 18:28:34 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 28 May 2009 15:28:34 -0700 (PDT)
Subject: py2app and OpenGL, "No module named util" in ctypes
References: <b09874da-5dcb-4b60-aae8-f430f1db5ba1@o20g2000vbh.googlegroups.com>
Message-ID: <4b5d6a4d-975e-4459-af9a-926b19aaa7d4@y10g2000prc.googlegroups.com>

On May 28, 11:06?am, trhaynes <trhay... at gmail.com> wrote:
> I'm trying to use py2app to package an OpenGL app, so first I tried to
> build the example here
>
> http://svn.pythonmac.org/py2app/py2app/trunk/examples/PyOpenGL/
>
> and I get the error:
>
> > ?File "/opt/local/lib/python2.5/site-packages/PyOpenGL-3.0.0c1-py2.5.egg/OpenGL/platform/darwin.py", line 24, in <module>
> > ? ?import ctypes, ctypes.util
> >ImportError: No module named util
> >2009-05-28 13:55:06.819 lesson5[19965:10b] lesson5 Error
> >2009-05-28 13:55:06.821 lesson5[19965:10b] lesson5 Error
> >An unexpected error has occurred during execution of the main script
>
> >ImportError: No module named util
>
> But when I open up my python interactive interpreter and "import
> ctypes.util", it works fine (using lesson5.app/Contents/MacOS/python,
> too).
>
> Thanks for the help.

What has happened is that py2app didn't bundle ctypes.util with the
app, because py2app failed to detect that it was imported for some
reason.

A typical workaround is to imported in maually in your main script to
make it explicit to py2app that it should be packaged.

A word of caution: PyOpenGL uses entry hooks and that can cause a lot
of trouble for application builder utilities like py2exe and py2app.
In fact, I decided to stop using PyOpenGL in my projects in large part
because of that issue (I use my own OpenGL wrapper now).  It's
possible py2app has learned to deal with entry hooks by now, but these
days I refuse to use packages that require entry hooks so I wouldn't
know.


Carl Banks


From usenet at janc.invalid  Thu May 28 18:37:30 2009
From: usenet at janc.invalid (JanC)
Date: Thu, 28 May 2009 22:37:30 +0000 (UTC)
Subject: Network programming ?
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
	<a4ec6a83-7624-4529-ba1d-09b137376b78@k2g2000yql.googlegroups.com>
Message-ID: <gvn3na$srv$1@news.eternal-september.org>

CTO wrote:

> There's a book called Foundations of Python Network Programming that
> is pretty much as good a book as you could ever ask for on the subject. I
> strongly recommend it, and I think you'll find many of the examples
> relevant.

Yeah, I can recommend that book too.


-- 
JanC


From guthrie at mum.edu  Thu May 28 18:43:26 2009
From: guthrie at mum.edu (guthrie)
Date: Thu, 28 May 2009 15:43:26 -0700 (PDT)
Subject: python list pattern matching?
Message-ID: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>

I want to do a functional like pattern match to get teh first two
elements, and then the rest of an array return value.

For example, assume that perms(x) returns a list of values, and I want
to do this:
    seq=perms(x)

    a = seq[0]
    b = seq[1]
    rest = seq[2:]
Of course I can shorten to:
    [a,b] = seq[0:2]
    rest  = seq[2:]

Can I find use some notation to do this?
    [a,b,more] = perms(x)
or conceptually:
    [a,b,more..] = perms(x)

PROLOG & functional languages do list decomposition so nicely like
this!


From tjreedy at udel.edu  Thu May 28 18:57:42 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 28 May 2009 18:57:42 -0400
Subject: python list pattern matching?
In-Reply-To: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
Message-ID: <gvn4t5$tbh$1@ger.gmane.org>

guthrie wrote:
> I want to do a functional like pattern match to get teh first two
> elements, and then the rest of an array return value.
> 
> For example, assume that perms(x) returns a list of values, and I want
> to do this:
>     seq=perms(x)
> 
>     a = seq[0]
>     b = seq[1]
>     rest = seq[2:]
> Of course I can shorten to:
>     [a,b] = seq[0:2]
>     rest  = seq[2:]
> 
> Can I find use some notation to do this?
>     [a,b,more] = perms(x)
> or conceptually:
>     [a,b,more..] = perms(x)

 >>> a,b,*rest = list(range(10))
 >>> a,b,rest
(0, 1, [2, 3, 4, 5, 6, 7, 8, 9])
 >>> a,*rest,b = 'abcdefgh'
 >>> a,rest,b
('a', ['b', 'c', 'd', 'e', 'f', 'g'], 'h')



From clp2 at rebertia.com  Thu May 28 19:00:29 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 28 May 2009 16:00:29 -0700
Subject: python list pattern matching?
In-Reply-To: <gvn4t5$tbh$1@ger.gmane.org>
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
	<gvn4t5$tbh$1@ger.gmane.org>
Message-ID: <50697b2c0905281600l1fdcbe1btb1813f7dd68bf4e5@mail.gmail.com>

On Thu, May 28, 2009 at 3:57 PM, Terry Reedy <tjreedy at udel.edu> wrote:
> guthrie wrote:
>>
>> I want to do a functional like pattern match to get teh first two
>> elements, and then the rest of an array return value.
>>
>> For example, assume that perms(x) returns a list of values, and I want
>> to do this:
>> ? ?seq=perms(x)
>>
>> ? ?a = seq[0]
>> ? ?b = seq[1]
>> ? ?rest = seq[2:]
>> Of course I can shorten to:
>> ? ?[a,b] = seq[0:2]
>> ? ?rest ?= seq[2:]
>>
>> Can I find use some notation to do this?
>> ? ?[a,b,more] = perms(x)
>> or conceptually:
>> ? ?[a,b,more..] = perms(x)
>
>>>> a,b,*rest = list(range(10))
>>>> a,b,rest
> (0, 1, [2, 3, 4, 5, 6, 7, 8, 9])
>>>> a,*rest,b = 'abcdefgh'
>>>> a,rest,b
> ('a', ['b', 'c', 'd', 'e', 'f', 'g'], 'h')

Note that this snazzy new syntax requires Python 3.0+

Cheers,
Chris
-- 
http://blog.rebertia.com


From marius.s.retegan at gmail.com  Thu May 28 19:03:45 2009
From: marius.s.retegan at gmail.com (Marius Retegan)
Date: Thu, 28 May 2009 16:03:45 -0700 (PDT)
Subject: extract to dictionaries
Message-ID: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>

Hello
I have simple text file that I have to parse. It looks something like
this:

parameters1
     key1 value1
     key2 value2
end

parameters2
     key1 value1
     key2 value2
end

So I want to create two dictionaries parameters1={key1:value1,
key2:value2} and the same for parameters2.

I woud appreciate any help that could help me solve this.
Thank you



From mensanator at aol.com  Thu May 28 19:05:21 2009
From: mensanator at aol.com (Mensanator)
Date: Thu, 28 May 2009 16:05:21 -0700 (PDT)
Subject: python list pattern matching?
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
Message-ID: <bd979d2e-1280-4612-8a08-874a1df92a05@c9g2000yqm.googlegroups.com>

On May 28, 5:43?pm, guthrie <guth... at mum.edu> wrote:
> I want to do a functional like pattern match to get teh first two
> elements, and then the rest of an array return value.
>
> For example, assume that perms(x) returns a list of values, and I want
> to do this:
> ? ? seq=perms(x)
>
> ? ? a = seq[0]
> ? ? b = seq[1]
> ? ? rest = seq[2:]
> Of course I can shorten to:
> ? ? [a,b] = seq[0:2]
> ? ? rest ?= seq[2:]
>
> Can I find use some notation to do this?
> ? ? [a,b,more] = perms(x)
> or conceptually:
> ? ? [a,b,more..] = perms(x)

>>> perms = 'abcdefghijklmnopqrstuvwxyz'
>>> [a,b],more = perms[0:2],perms[2:]
>>> a
'a'
>>> b
'b'
>>> more
'cdefghijklmnopqrstuvwxyz'


>
> PROLOG & functional languages do list decomposition so nicely like
> this!



From seattlehanks at yahoo.com  Thu May 28 19:05:46 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Thu, 28 May 2009 16:05:46 -0700 (PDT)
Subject: How can 'type' be an instance of itself?
Message-ID: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>

This is probably trivial, but it's driving me mad somehow. All (new
style) classes are instances of 'type' by default, unless a custom
metaclass is specified. I take this to mean that when a class
declaration is found in the code, an instance of 'type' representing
that class is created by calling type.__init__. What really gets me is
how can 'type' be an instance of itself. In order to create 'type' we
would need to call type.__init__, but it seems at this point it
wouldn't exist. Probably a dumb question, which I hope someone can
explain in some detail.


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 19:15:14 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 23:15:14 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<gvljmv$8hg$5@lust.ihug.co.nz>
	<003a5518$0$9673$c3e8da3@news.astraweb.com>
	<gvmu98$25d$1@lust.ihug.co.nz>
Message-ID: <003af57e$0$9673$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 09:04:39 +1200, Lawrence D'Oliveiro wrote:

> In message <003a5518$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano
> wrote:
> 
>> On Thu, 28 May 2009 20:58:07 +1200, Lawrence D'Oliveiro wrote:
>> 
>>> In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven
>>> D'Aprano wrote:
>>> 
>>>> A good UI standard should mean that:
>>>> 
>>>> * all functionality should be discoverable without reading the
>>>> manual;
>>> 
>>> Which means no scripting languages are allowed?
>> 
>> "Should", not "must".
> 
> If you meant "may or may not", why don't you say "may or may not"?


Are you a native English speaker? "Should" does not mean "may or may 
not". There is an enormous difference in meaning between e.g. "I should 
feed the dog" and "I may or may not feed the dog". The first case means 
that you have a need to feed the dog, but you are not obliged to, while 
the second case means you are indifferent to whether or not you will feed 
the dog.

(Strictly speaking, "may or may not" is redundant, although often used to 
emphasise the indifference. If you may do something, then by definition 
you also may not do it.)

The distinction between "may", "should" and "must" is also very common in 
RFCs. As a tech, I would have expected you to have been aware of that. 
For example, picking one at random, RFC 1866 (literally the first one I 
looked up!):

may
    A document or user interface is conforming whether this
    statement applies or not.

must
    Documents or user agents in conflict with this statement
    are not conforming.

should
    If a document or user agent conflicts with this
    statement, undesirable results may occur in practice
    even though it conforms to this specification.

http://www.faqs.org/rfcs/rfc1866.html

To put it another way: "may" is optional, "should" is recommended, and 
"must" is compulsory.



-- 
Steven


From bearophileHUGS at lycos.com  Thu May 28 19:24:57 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 28 May 2009 16:24:57 -0700 (PDT)
Subject: python list pattern matching?
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
	<mailman.859.1243551475.8015.python-list@python.org>
Message-ID: <3d6c5008-33cb-401d-8b87-c980ee8dcd08@g37g2000yqn.googlegroups.com>

Terry Reedy:
> ?>>> a,b,*rest = list(range(10))
> ?>>> a,b,rest
> (0, 1, [2, 3, 4, 5, 6, 7, 8, 9])
> ?>>> a,*rest,b = 'abcdefgh'
> ?>>> a,rest,b
> ('a', ['b', 'c', 'd', 'e', 'f', 'g'], 'h')

For the next few years I generally suggest to specify the Python
version too (if it's 2.x or 3.x).
This is Python 3.x.

Bye,
bearophile


From lists at cheimes.de  Thu May 28 19:37:12 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 29 May 2009 01:37:12 +0200
Subject: How can 'type' be an instance of itself?
In-Reply-To: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>
References: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>
Message-ID: <gvn779$3g5$1@ger.gmane.org>

LittleGrasshopper wrote:
> This is probably trivial, but it's driving me mad somehow. All (new
> style) classes are instances of 'type' by default, unless a custom
> metaclass is specified. I take this to mean that when a class
> declaration is found in the code, an instance of 'type' representing
> that class is created by calling type.__init__. What really gets me is
> how can 'type' be an instance of itself. In order to create 'type' we
> would need to call type.__init__, but it seems at this point it
> wouldn't exist. Probably a dumb question, which I hope someone can
> explain in some detail.

The classes 'type' and 'object' are written in C. You can do things in C
code that aren't possible from pure Python code. The circular
dependencies between 'type' and 'object' are created during the boot
strapping phase of the interpreter.

>>> type(type)
<type 'type'>
>>> type.__bases__
(<type 'object'>,)
>>> object.__bases__
()
>>> type(object)
<type 'type'>

Christian



From seattlehanks at yahoo.com  Thu May 28 19:46:34 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Thu, 28 May 2009 16:46:34 -0700 (PDT)
Subject: How can 'type' be an instance of itself?
References: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>
	<mailman.860.1243553846.8015.python-list@python.org>
Message-ID: <600ff66c-8379-4171-908f-b0beaf693c87@x31g2000prc.googlegroups.com>

On May 28, 4:37?pm, Christian Heimes <li... at cheimes.de> wrote:
> LittleGrasshopper wrote:
> > This is probably trivial, but it's driving me mad somehow. All (new
> > style) classes are instances of 'type' by default, unless a custom
> > metaclass is specified. I take this to mean that when a class
> > declaration is found in the code, an instance of 'type' representing
> > that class is created by calling type.__init__. What really gets me is
> > how can 'type' be an instance of itself. In order to create 'type' we
> > would need to call type.__init__, but it seems at this point it
> > wouldn't exist. Probably a dumb question, which I hope someone can
> > explain in some detail.
>
> The classes 'type' and 'object' are written in C. You can do things in C
> code that aren't possible from pure Python code. The circular
> dependencies between 'type' and 'object' are created during the boot
> strapping phase of the interpreter.
>
> >>> type(type)
> <type 'type'>
> >>> type.__bases__
> (<type 'object'>,)
> >>> object.__bases__
> ()
> >>> type(object)
>
> <type 'type'>
>
> Christian

That puts my mind at ease, thank you!


From bearophileHUGS at lycos.com  Thu May 28 19:59:57 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 28 May 2009 16:59:57 -0700 (PDT)
Subject: extract to dictionaries
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
Message-ID: <277f8670-0ed7-4de1-8645-b528a18c683b@f19g2000yqh.googlegroups.com>

Marius Retegan:
>
> parameters1
> ? ? ?key1 value1
> ? ? ?key2 value2
> end
>
> parameters2
> ? ? ?key1 value1
> ? ? ?key2 value2
> end
>
> So I want to create two dictionaries parameters1={key1:value1,
> key2:value2} and the same for parameters2.

I have wasted some time trying to create a regex for that. But it's
better to use normal code. Iterate on the lines, keep a dict, and when
you find a string that doesn't start with whitespace, use it to create
a new key-value into the dict, where the key is the stripped line and
the value is an empty dict. Then you can enter a sub loop or set a
"inside" boolean variable, to denote you are in a different part of
the state machine. When you find lines that start with a space, you
can put add them as key-value into the latest dict (so you have to
keep the key name in the superdict, or more efficiently you can keep
your subdict on a side, and you can add it only at the end when you
see a line "end" with no leading spaces. When you find such "end" you
can exit the sub loop or rest the "inside" boolean.
Overall if's just few lines of code, much shorter than my description
of the algorithm.

Bye,
bearophile


From gherron at islandtraining.com  Thu May 28 20:09:21 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 28 May 2009 17:09:21 -0700
Subject: extract to dictionaries
In-Reply-To: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
Message-ID: <4A1F27B1.7040005@islandtraining.com>

Marius Retegan wrote:
> Hello
> I have simple text file that I have to parse. It looks something like
> this:
>
> parameters1
>      key1 value1
>      key2 value2
> end
>
> parameters2
>      key1 value1
>      key2 value2
> end
>
> So I want to create two dictionaries parameters1={key1:value1,
> key2:value2} and the same for parameters2.
>
> I woud appreciate any help that could help me solve this.
> Thank you
>   

This looks like a homework problem.   But even if it's not, you are not 
likely to find someone who is willing to put more work into this problem 
than you have. 

So  why don't you show us what you've tried, and see if someone is 
willing to make suggestions or answer specific question about your 
attempt at a solution?

Gary Herron


From seattlehanks at yahoo.com  Thu May 28 20:20:18 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Thu, 28 May 2009 17:20:18 -0700 (PDT)
Subject: How can 'type' be an instance of itself?
References: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>
	<mailman.860.1243553846.8015.python-list@python.org>
Message-ID: <9769ee93-929a-4af7-8014-2f641cb52a2f@y6g2000prf.googlegroups.com>

On May 28, 4:37?pm, Christian Heimes <li... at cheimes.de> wrote:
> LittleGrasshopper wrote:
> > This is probably trivial, but it's driving me mad somehow. All (new
> > style) classes are instances of 'type' by default, unless a custom
> > metaclass is specified. I take this to mean that when a class
> > declaration is found in the code, an instance of 'type' representing
> > that class is created by calling type.__init__. What really gets me is
> > how can 'type' be an instance of itself. In order to create 'type' we
> > would need to call type.__init__, but it seems at this point it
> > wouldn't exist. Probably a dumb question, which I hope someone can
> > explain in some detail.
>
> The classes 'type' and 'object' are written in C. You can do things in C
> code that aren't possible from pure Python code. The circular
> dependencies between 'type' and 'object' are created during the boot
> strapping phase of the interpreter.
>
> >>> type(type)
> <type 'type'>
> >>> type.__bases__
> (<type 'object'>,)
> >>> object.__bases__
> ()
> >>> type(object)
>
> <type 'type'>
>
> Christian

And just to clarify that I do really understand what this means, I
gather that what it entails is that 'type' is an instance of itself
just from a conceptual point of view. In other words, the code for the
(meta)class 'type' is created statically by object code (compiled C
code) before the python runtime is initiated (you referred to it as
the interpreter bootstrapping phase.) I also guess that this code sets
__class__ and __metaclass__ to the 'type' object itself (I am guessing
a self-referencial pointer in C.) While I just am hypothesizing on the
details, please let me know if you sense that I have misunderstood any
essential part of your explanation.

Thanks,

Lukas


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 20:30:20 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 00:30:20 GMT
Subject: python list pattern matching?
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
	<mailman.859.1243551475.8015.python-list@python.org>
Message-ID: <003b0719$0$9673$c3e8da3@news.astraweb.com>

On Thu, 28 May 2009 18:57:42 -0400, Terry Reedy wrote:

>  >>> a,b,*rest = list(range(10))

That fails in Python 2.5 and 2.6.

>>> a,b,*rest = list(range(10))
  File "<stdin>", line 1
    a,b,*rest = list(range(10))
        ^
SyntaxError: invalid syntax




-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 20:36:07 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 00:36:07 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de>
	<02204669$0$25303$c3e8da3@news.astraweb.com>
	<kkb00q.g62@spenarnc.xs4all.nl>
	<0039e85f$0$9673$c3e8da3@news.astraweb.com>
	<8cc46645-100a-46e4-9b7c-9dff7f1e2c18@z19g2000vbz.googlegroups.com>
Message-ID: <003b0873$0$9673$c3e8da3@news.astraweb.com>

On Thu, 28 May 2009 10:53:17 -0700, Aaron Brady wrote:

> On May 27, 11:07?pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> On Wed, 27 May 2009 12:58:02 +0000, Albert van der Horst wrote:
>>
>> >>And how is reduce() supposed to know whether or not some arbitrary
>> >>function is commutative?
>>
>> > Why would it or need it? A Python that understands the ``par''
>> > keyword is supposed to know it can play some tricks with optimizing
>> > reduce() if the specific function is commutative.
>>
>> Fine. Move the smarts out of reduce() into the compiler. How is the
>> compiler supposed to know if an arbitrary function is commutative?
> 
> Unit testing.

(Correction: the characteristic we really care about is associativity, 
not commutativity.)

I really shouldn't reply to this, because I fear this is just going to 
drag me down into a bottomless pit, but here goes...

I don't see how unit tests can possibly help. There's an infinite number 
of possible functions that could be passed to parallel reduce(), and you 
can't test them all. Even if you lower your sights and just aim to 
recognise a tiny subset of associative functions, you end up with code 
like this:

def par_reduce(func, *args):
    if func in (operator.add, operator.mul):
        if isinstance(args[0], (int, long)):
            return _associative_par_reduce(func, *args)
    return _nonassociative_par_reduce(func, *args)

You can't even recognise functions like lambda x,y: x+y. In case you're 
thinking you can, no, "if func == lambda x,y: x+y" won't work:

>>> (lambda x,y: x+y) == (lambda x,y: x+y)
False

I suppose if you're willing to special case a tiny handful of functions, 
that's a solution of sorts, but I did ask about arbitrary functions.

Perhaps you're thinking of another approach: put the unit tests inside 
the par_reduce() function, and use them to determine at runtime whether 
or not the argument func is associative.

def par_reduce(func, *args):
    try:
        # a mass of unittests
    except Exception:
        # are we catching too much? are we masking bugs in the tests?
        return _nonassociative_par_reduce(func, *args)
    return _associative_par_reduce(func, *args)


This would be impractical, because the cost would be enormous. But even 
putting that aside, it still wouldn't work. I don't see how you could 
know what is a valid unittest for an arbitrary function, but suppose you 
could, somehow. Then what? True enough, if you run lots of tests, and it 
fails one, then you know that func is not associative. But having passed 
all those tests, you can't know if your tests covered all the possible 
cases.

E.g. for floats, you can run some tests and decide that addition looks 
associative:

>>> 0.1 + (0.1 + 0.1) == (0.1 + 0.1) + 0.1
True
>>> 0.1 + (0.9 + 0.1) == (0.1 + 0.9) + 0.1
True
>>> 0.1e67 + (0.9 + 0.3) == (0.1e67 + 0.9) + 0.3
True
>>> 0.1e54 + (0.9 + 0.1) == (0.1e54 + 0.9) + 0.1
True

but you'd be wrong:

>>> 1e54 + (-1e54 + 0.1) == (1e54 + -1e54) + 0.1
False

No, you can't expect to discover experimentally whether an arbitrary 
function is associative. You would need to analyse what the function 
does, which means in practice the *programmer* needs to decide what to 
do, not reduce().



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 20:49:37 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 00:49:37 GMT
Subject: Most pythonic way to truncate unicode?
References: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>
Message-ID: <003b0b9d$0$9673$c3e8da3@news.astraweb.com>

On Thu, 28 May 2009 08:50:00 -0700, Andrew Fong wrote:

> I need to ...
> 
> 1) Truncate long unicode (UTF-8) strings based on their length in BYTES.

Out of curiosity, why do you need to do this?


> For example, u'\u4000\u4001\u4002 abc' has a length of 7 but takes up 13
> bytes. 

No, that's wrong. The number of bytes depends on the encoding, it's not a 
property of the unicode string itself.

>>> s = u'\u4000\u4001\u4002 abc'
>>> len(s)  # characters
7
>>> len(s.encode('utf-8'))  # bytes
13
>>> len(s.encode('utf-16'))  # bytes
16
>>> len(s.encode('U32'))  # bytes
32


> Since u'\u4000' takes up 3 bytes

But it doesn't. The *encoded* unicode character *may* take up three 
bytes, or four, or possibly more, depending on what encoding you use.


-- 
Steven


From mobiledreamers at gmail.com  Thu May 28 21:47:44 2009
From: mobiledreamers at gmail.com (mobiledreamers at gmail.com)
Date: Thu, 28 May 2009 18:47:44 -0700
Subject: problems with Cheetah base class being in templates directory
Message-ID: <c1870d60905281847n6896c29dr20785b8fc1f58b7c@mail.gmail.com>

*How do we setup Cheetah so it runs with all templates in the templates
directory and all code in the .. directory

code.py*
production=True
if not production:
    try:web.render('mafbase.tmpl', None, True, 'mafbase')
    except:pass
else:
    from templates import mafbase


templates/mafbase.tmpl
templates/mafbase.py


    try:web.render('mafbase.tmpl', None, True, 'mafbase')
This works but is very slow to load and causes timeout errors


    from templates import mafbase

This doesnt work
   return self._delegate(fn, self.fvars, args)
  File "/home/mark/work/common/web/application.py", line 411, in _delegate
    return handle_class(cls)
  File "/home/mark/work/common/web/application.py", line 386, in
handle_class
    return tocall(*args)
  File "user.py", line 262, in proxyfunc
    return func(self, *args, **kw)
  File "/home/mark/work/pop/code.py", line 1796, in GET
    return web.render('subclass.html')
  File "/home/mark/work/common/web/cheetah.py", line 104, in render
    return str(compiled_tmpl)
  File
"/usr/lib/python2.5/site-packages/Cheetah-2.0.1-py2.5-linux-i686.egg/Cheetah/Template.py",
line 982, in __str__
    def __str__(self): return getattr(self, mainMethName)()
  File "mafbase.py", line 634, in respond
  File
"/usr/lib/python2.5/site-packages/Cheetah-2.0.1-py2.5-linux-i686.egg/Cheetah/Template.py",
line 1512, in _handleCheetahInclude
    nestedTemplateClass = compiler.compile(source=source,file=file)
  File
"/usr/lib/python2.5/site-packages/Cheetah-2.0.1-py2.5-linux-i686.egg/Cheetah/Template.py",
line 693, in compile
    fileHash = str(hash(file))+str(os.path.getmtime(file))
  File "/usr/lib/python2.5/posixpath.py", line 143, in getmtime
    return os.stat(filename).st_mtime
OSError: [Errno 2] No such file or directory:
'/home/mark/work/pop/widgetbox.html'



-- 
Bidegg worlds best auction site
http://bidegg.com
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From guthrie at mum.edu  Thu May 28 21:56:44 2009
From: guthrie at mum.edu (guthrie)
Date: Thu, 28 May 2009 18:56:44 -0700 (PDT)
Subject: python list pattern matching?
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
	<mailman.859.1243551475.8015.python-list@python.org>
	<003b0719$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <5b3e82b5-62c7-445f-9512-8f84b6d0805b@c36g2000yqn.googlegroups.com>

Many thanks to all; perfect solution!


From ldo at geek-central.gen.new_zealand  Thu May 28 22:00:19 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 29 May 2009 14:00:19 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<gvljmv$8hg$5@lust.ihug.co.nz>
	<003a5518$0$9673$c3e8da3@news.astraweb.com>
	<gvmu98$25d$1@lust.ihug.co.nz>
	<003af57e$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <gvnfjj$c0d$2@lust.ihug.co.nz>

In message <003af57e$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano 
wrote:

> On Fri, 29 May 2009 09:04:39 +1200, Lawrence D'Oliveiro wrote:
> 
>> In message <003a5518$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano
>> wrote:
>> 
>>> On Thu, 28 May 2009 20:58:07 +1200, Lawrence D'Oliveiro wrote:
>>> 
>>>> In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven
>>>> D'Aprano wrote:
>>>> 
>>>>> A good UI standard should mean that:
>>>>> 
>>>>> * all functionality should be discoverable without reading the
>>>>> manual;
>>>> 
>>>> Which means no scripting languages are allowed?
>>> 
>>> "Should", not "must".
>> 
>> If you meant "may or may not", why don't you say "may or may not"?
> 
> "Should" does not mean "may or may not".

I'm not sure how there is supposed to be a difference in this context. "All 
people should fly by flapping their arms, except where this is physically 
impossible". You're asking for something that is infeasible with most 
current editors, if not all of them.



From tiskanto at gmail.com  Thu May 28 22:34:21 2009
From: tiskanto at gmail.com (Teguh Iskanto)
Date: Fri, 29 May 2009 12:34:21 +1000
Subject: extract to dictionaries
In-Reply-To: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
Message-ID: <e137e8260905281934m10a653a2v684b8fe0821f3829@mail.gmail.com>

You can create this modularly by :
1. parse the file and cut this into different chunks ( look for 'end' ) then
you have two chunks for param 1 & 2
2. once you have those chunks then process each chunk with your own
processing based on your parameters ( 1 or 2 )
3. then based on your individual param, create a process to populate your
dict
4. done

hint: "pydoc string"  ( I'm assuming that you already know about regex, if
not then use this : "pydoc re"  )
BTW: I've used this methods to parse  cisco/contivity configs

HTH

On Fri, May 29, 2009 at 9:03 AM, Marius Retegan
<marius.s.retegan at gmail.com>wrote:

> Hello
> I have simple text file that I have to parse. It looks something like
> this:
>
> parameters1
>     key1 value1
>     key2 value2
> end
>
> parameters2
>     key1 value1
>     key2 value2
> end
>
> So I want to create two dictionaries parameters1={key1:value1,
> key2:value2} and the same for parameters2.
>
> I woud appreciate any help that could help me solve this.
> Thank you
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From ronn.ross at gmail.com  Thu May 28 22:48:10 2009
From: ronn.ross at gmail.com (Ronn Ross)
Date: Thu, 28 May 2009 22:48:10 -0400
Subject: Tkinter file dialog
Message-ID: <9c8c445f0905281948r537a53f9j63bc5c2209d37145@mail.gmail.com>

I'm using Tkinter file selector to get a direcotry path. I'm using:

self.file = tkFileDialog.askdirectory(title="Please select your directory")
        print file

but all it prints out is:
<type 'file'>

How would I print the directory path?

Thanks
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From sjmachin at lexicon.net  Thu May 28 23:17:35 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 29 May 2009 03:17:35 +0000 (UTC)
Subject: Most pythonic way to truncate unicode?
References: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>
Message-ID: <loom.20090529T025751-848@post.gmane.org>

Andrew Fong <FongAndrew <at> gmail.com> writes:


> I need to ...
> 1) Truncate long unicode (UTF-8) strings based on their length in
> BYTES.
> 2) I don't want to accidentally chop any unicode characters in half.
> If the byte truncate length would normally cut a unicode character in
> 2, then I just want to drop the whole character, not leave an orphaned
> byte. 
> I'm using Python2.6, so I have access to things like bytearray.

Using bytearray saves you from using ord()
but runs the risk of accidental mutation.

> Are
> there any built-in ways to do something like this already? Or do I
> just have to iterate over the unicode string?

Converting each character to utf8 and checking the
total number of bytes so far?
Ooooh, sloooowwwwww!

The whole concept of "truncating unicode"
you mean "truncating utf8") seems
rather unpythonic to me. 

Another alternative is to iterate backwards
over the utf8 string looking for a
character-starting byte. It leads to a candidate
for Unpythonic Code of the Year:

def utf8trunc(u8s, maxlen):
    assert maxlen >= 1
    alen = len(u8s)
    if alen <= maxlen:
        return u8s
    pos = maxlen - 1
    while pos >= 0:
        val = ord(u8s[pos])
        if val & 0xC0 != 0x80:
            # found an initial byte
            break
        pos -= 1
    else:
        # no initial byte found
        raise ValueError("malformed UTF-8 [1]")
    if maxlen - pos > 4:
        raise ValueError("malformed UTF-8 [2]")
    if val & 0x80:
        charlen = (2, 2, 3, 4)[(val >> 4) & 3]
    else:
        charlen = 1
    nextpos = pos + charlen
    assert nextpos >= maxlen
    if nextpos == maxlen:
        return u8s[:nextpos]
    return u8s[:pos]

if __name__ == "__main__":
    tests = [u"", u"\u0000", u"\u007f", u"\u0080",
        u"\u07ff", u"\u0800", u"\uffff" ]
    for testx in tests:
        test = u"abcde" + testx + u"pqrst"
        u8 = test.encode('utf8')
        print repr(test), repr(u8), len(u8)
        for mlen in range(4,
            8 + len(testx.encode('utf8'))):
            u8t = utf8trunc(u8, mlen)
            print "    ", mlen, len(u8t), repr(u8t)

Tested to the extent shown. Doesn't pretend to check
for all cases of UTF-8
malformation, just easy ones :-)

Cheers,
John



From clp2 at rebertia.com  Thu May 28 23:44:38 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 28 May 2009 20:44:38 -0700
Subject: Tkinter file dialog
In-Reply-To: <9c8c445f0905281948r537a53f9j63bc5c2209d37145@mail.gmail.com>
References: <9c8c445f0905281948r537a53f9j63bc5c2209d37145@mail.gmail.com>
Message-ID: <50697b2c0905282044k2f47e681u5e5aedb4b301ca82@mail.gmail.com>

On Thu, May 28, 2009 at 7:48 PM, Ronn Ross <ronn.ross at gmail.com> wrote:
> I'm using Tkinter file selector to get a direcotry path. I'm using:
>
> self.file = tkFileDialog.askdirectory(title="Please select your directory")
> ??????? print file
>
> but all it prints out is:
> <type 'file'>
>
> How would I print the directory path?

print self.file

Your forgot the "self." in your version. Without it, Python assumes
you're talking about built-in `file` type.

Cheers,
Chris
-- 
http://blog.rebertia.com


From sjmachin at lexicon.net  Fri May 29 00:09:53 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 29 May 2009 04:09:53 +0000 (UTC)
Subject: Most pythonic way to truncate unicode?
References: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>
	<loom.20090529T025751-848@post.gmane.org>
Message-ID: <loom.20090529T035246-680@post.gmane.org>

John Machin <sjmachin <at> lexicon.net> writes:

> Andrew Fong <FongAndrew <at> gmail.com> writes:

 > Are
> > there any built-in ways to do something like this already? Or do I
> > just have to iterate over the unicode string?
> 
> Converting each character to utf8 and checking the
> total number of bytes so far?
> Ooooh, sloooowwwwww!
> 

Somewhat faster:

u8len = 0
for u in unicode_string:
   if u <= u'\u007f':
      u8len += 1
   elif u <= u'\u07ff':
      u8len += 2
   elif u <= u'\uffff':
      u8len += 3
   else:
      u8len += 4

Cheers,
John



From steve at REMOVE-THIS-cybersource.com.au  Fri May 29 00:22:39 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 04:22:39 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<gvljmv$8hg$5@lust.ihug.co.nz>
	<003a5518$0$9673$c3e8da3@news.astraweb.com>
	<gvmu98$25d$1@lust.ihug.co.nz>
	<003af57e$0$9673$c3e8da3@news.astraweb.com>
	<gvnfjj$c0d$2@lust.ihug.co.nz>
Message-ID: <003b3d8c$0$9673$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 14:00:19 +1200, Lawrence D'Oliveiro wrote:

> In message <003af57e$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano
> wrote:
> 
>> On Fri, 29 May 2009 09:04:39 +1200, Lawrence D'Oliveiro wrote:
>> 
>>> In message <003a5518$0$9673$c3e8da3 at news.astraweb.com>, Steven
>>> D'Aprano wrote:
>>> 
>>>> On Thu, 28 May 2009 20:58:07 +1200, Lawrence D'Oliveiro wrote:
>>>> 
>>>>> In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven
>>>>> D'Aprano wrote:
>>>>> 
>>>>>> A good UI standard should mean that:
>>>>>> 
>>>>>> * all functionality should be discoverable without reading the
>>>>>> manual;
>>>>> 
>>>>> Which means no scripting languages are allowed?
>>>> 
>>>> "Should", not "must".
>>> 
>>> If you meant "may or may not", why don't you say "may or may not"?
>> 
>> "Should" does not mean "may or may not".
> 
> I'm not sure how there is supposed to be a difference in this context.
> "All people should fly by flapping their arms, except where this is
> physically impossible". You're asking for something that is infeasible
> with most current editors, if not all of them.


On the remote chance that you're not trolling, I deny that 
discoverablity is "infeasible", for editors or other applications. Making 
a UI discoverable is not a hard problem that is difficult to solve. 
Discoverablity isn't radical new concept in UI design, it has been 
around since the 1970s, at least.

The concept is simple: e.g. in the editor I'm using to compose this 
message, I have a toolbar which includes a button "Wrap Text". That's 
discoverable, because even if I didn't know the command existed, I could 
discover it by looking at the toolbar. There's a keyboard command to do 
the same thing: Alt-E-W. Without reading the manual, I'm unlikely to 
discover that command.

Here's a couple of screenshots of Wordstar:

http://www.kantl.be/ctb/vanhoutte/teach/slides/graphics/wstar.gif
http://www.iee.et.tu-dresden.de/~kc-club/08/PCX/WORDSTAR.GIF

Wordstar's commands are discoverable, because they are listed in a menu 
you can choose from. Wordstar dates back to 1978, so this isn't precisely 
the cutting edge of UI design.

As a general rule, menus are discoverable, while keyboard commands 
aren't. There's nothing inherent to text editing functions which makes 
then inherently undiscoverable, and KDE apps like kate and kwrite do a 
reasonable job of making them so.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May 29 00:27:58 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 04:27:58 GMT
Subject: Most pythonic way to truncate unicode?
References: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>
	<loom.20090529T025751-848@post.gmane.org>
	<mailman.866.1243570209.8015.python-list@python.org>
Message-ID: <003b3ecb$0$9673$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 04:09:53 +0000, John Machin wrote:

> John Machin <sjmachin <at> lexicon.net> writes:
> 
>> Andrew Fong <FongAndrew <at> gmail.com> writes:
> 
>  > Are
>> > there any built-in ways to do something like this already? Or do I
>> > just have to iterate over the unicode string?
>> 
>> Converting each character to utf8 and checking the total number of
>> bytes so far?
>> Ooooh, sloooowwwwww!
>> 
>> 
> Somewhat faster:

What's wrong with Peter Otten's solution?

>>> u"???".encode("utf8")[:5].decode("utf8", "ignore")
u'\xe4\xf6'

At most, you should have one error, at the very end. If you ignore it, 
you get the unicode characters that have length <= 5 in *bytes* when 
encoded as UTF-8.

(If you encode using a different codec, you will likely get a different 
number of bytes.)


-- 
Steven


From jdoe at usenetlove.invalid  Fri May 29 01:15:50 2009
From: jdoe at usenetlove.invalid (John Doe)
Date: Fri, 29 May 2009 05:15:50 GMT
Subject: Messages from Python Macros, always on top?
Message-ID: <acKTl.30780$yr3.20334@nlpi068.nbdc.sbc.com>

Anyone here familiar with Messages from Python Macros?

Can you make that window Always on Top?

Thanks.


From sjmachin at lexicon.net  Fri May 29 01:31:40 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 29 May 2009 05:31:40 +0000 (UTC)
Subject: Most pythonic way to truncate unicode?
References: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>
	<loom.20090529T025751-848@post.gmane.org>
	<mailman.866.1243570209.8015.python-list@python.org>
	<003b3ecb$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <loom.20090529T052054-967@post.gmane.org>

Steven D'Aprano <steve <at> REMOVE-THIS-cybersource.com.au> writes:

> 
> On Fri, 29 May 2009 04:09:53 +0000, John Machin wrote:
> 
> > John Machin <sjmachin <at> lexicon.net> writes:
> > 
> >> Andrew Fong <FongAndrew <at> gmail.com> writes:
> > 
> >  > Are
> >> > there any built-in ways to do something like this already? Or do I
> >> > just have to iterate over the unicode string?
> >> 
> >> Converting each character to utf8 and checking the total number of
> >> bytes so far?
> >> Ooooh, sloooowwwwww!
> >> 
> >> 
> > Somewhat faster:
> 
> What's wrong with Peter Otten's solution?
> 
> >>> u"???".encode("utf8")[:5].decode("utf8", "ignore")

Given the minimal info supplied by the OP, nothing. However if the OP were to
respond to your "why" question, and give some more info like how long is long,
what percentage of the average string is thrown away, does he have the utf8
version anyway, what's he going to do with the unicode version after it's been
truncated (convert it to utf8??), it may turn out that a unicode forwards search
or a utf8 backwards search may be preferable.

If Pyrex/Cython is an option, then one of those is likely to be preferable if
runtime is a major consideration.

Cheers,
John



From gagsl-py2 at yahoo.com.ar  Fri May 29 01:37:12 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 28 May 2009 22:37:12 -0700 (PDT)
Subject: Building mySQL-python with python 2.6
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>
	<mailman.793.1243429122.8015.python-list@python.org>
	<9-6dnT0O5_7YxYDXnZ2dnUVZ_tti4p2d@pdx.net> 
	<103438d3-7fdb-4963-b2f1-41bcb41903f4@f19g2000yqh.googlegroups.com>
Message-ID: <9bcdd671-0fe2-4c72-be55-d27a92ff5c3c@3g2000yqk.googlegroups.com>

On 28 mayo, 02:16, abolotnov <abolot... at gmail.com> wrote:

> say I obtain and install "an alternative" compiler. how do I tell
> python which one to use?

VS2008 Express Edition is available for free from the Microsoft site.

--
Gabriel Genellina


From tiskanto at gmail.com  Fri May 29 01:52:46 2009
From: tiskanto at gmail.com (Teguh Iskanto)
Date: Fri, 29 May 2009 15:52:46 +1000
Subject: DB-API execute params, am I missing something?
In-Reply-To: <gvnrco$890$1@ger.gmane.org>
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
	<gvkoep$oii$3@lust.ihug.co.nz>
	<mailman.819.1243494051.8015.python-list@python.org>
	<gvljl9$8hg$4@lust.ihug.co.nz> <gvnrco$890$1@ger.gmane.org>
Message-ID: <e137e8260905282252l7f1667bi502191d114fbaa85@mail.gmail.com>

On Fri, May 29, 2009 at 3:21 PM, Dennis Lee Bieber <wlfraed at ix.netcom.com>wrote:

>
>        This won't work as the DB-API is going to quote the parameter, and
> the final result would be '%'whatever'%'. Essentially, you must put the
> wildcard marker on the actual parameter before feeding it to the API.
> --
>        Wulfraed        Dennis Lee Bieber               KD6MOG
>        wlfraed at ix.netcom.com           wulfraed at bestiaria.com
>                HTTP://wlfraed.home.netcom.com/
>        (Bestiaria Support Staff:               web-asst at bestiaria.com)
>                HTTP://www.bestiaria.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


it works for me :)

mysql> select * from test_table ;
+------+------+------+
| a    | b    | c    |
+------+------+------+
| 0    | 0    | 0    |
| 1    | 1    | 1    |
| 2    | 2    | 2    |
| 3    | 3    | 3    |
| 4    | 4    | 4    |
| 5    | 5    | 5    |
| 6    | 6    | 6    |
| 7    | 7    | 7    |
| 8    | 8    | 8    |
| 9    | 9    | 9    |
| 10   | 10   | 10   |
| 11   | 11   | 11   |
| 12   | 12   | 12   |
| 13   | 13   | 13   |
| 14   | 14   | 14   |
| 15   | 15   | 15   |
| 16   | 16   | 16   |
| 17   | 17   | 17   |
| 18   | 18   | 18   |
| 19   | 19   | 19   |
| 20   | 20   | 20   |
| 21   | 21   | 21   |
| 22   | 22   | 22   |
| 23   | 23   | 23   |
| 24   | 24   | 24   |
| 25   | 25   | 25   |
| 26   | 26   | 26   |
| 27   | 27   | 27   |
| 28   | 28   | 28   |
| 29   | 29   | 29   |
+------+------+------+
30 rows in set (0.00 sec)


>>> import MySQLdb
>>> conn = MySQLdb.connect (host='localhost', user='root', passwd='crappy',
db='testme')
>>> input_crap = "0"
>>> conn.query("select * from test_table where a like '%%%s%%'" %input_crap)
>>> result = conn.store_result()
>>> rows = result.num_rows()
>>> cols = result.num_fields()
>>> data = result.fetch_row(rows,1)
>>> print data
({'a': '0', 'c': '0', 'b': '0'}, {'a': '10', 'c': '10', 'b': '10'}, {'a':
'20', 'c': '20', 'b': '20'})
>>>

HTH
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From tjreedy at udel.edu  Fri May 29 02:07:27 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 29 May 2009 02:07:27 -0400
Subject: How can 'type' be an instance of itself?
In-Reply-To: <9769ee93-929a-4af7-8014-2f641cb52a2f@y6g2000prf.googlegroups.com>
References: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>	<mailman.860.1243553846.8015.python-list@python.org>
	<9769ee93-929a-4af7-8014-2f641cb52a2f@y6g2000prf.googlegroups.com>
Message-ID: <gvnu2v$dk7$1@ger.gmane.org>

LittleGrasshopper wrote:
> On May 28, 4:37 pm, Christian Heimes <li... at cheimes.de> wrote:
>> LittleGrasshopper wrote:
>>> This is probably trivial, but it's driving me mad somehow. All (new
>>> style) classes are instances of 'type' by default, unless a custom
>>> metaclass is specified. I take this to mean that when a class

type(ob) simply looks up ob.__class__.  For built-in classes, that is 
all it means.

>>> declaration is found in the code, an instance of 'type' representing
>>> that class is created by calling type.__init__. What really gets me is
>>> how can 'type' be an instance of itself. In order to create 'type' we
>>> would need to call type.__init__, but it seems at this point it
>>> wouldn't exist. Probably a dumb question, which I hope someone can
>>> explain in some detail.

Actually, it is type.__new__ that creates the new object (as is true of 
all classes).  .__init__, when present, initializes mutable objects 
already created by .__new__.

This is a perceptive, not a dumb question.

>> The classes 'type' and 'object' are written in C. You can do things in C
>> code that aren't possible from pure Python code. The circular
>> dependencies between 'type' and 'object' are created during the boot
>> strapping phase of the interpreter.

In other words, the interpreter is god with respect to built-in objects. 
  For instance, the interpreter has to mutate 'immutable' objects in 
order to give then their immutable (thereafter) values.  So setting 
type.__class__ to type itself is no more of a big deal than the above, 
or setting any builtin.__class__ to type.

>>>>> type(type)
>> <type 'type'>
>>>>> type.__bases__
>> (<type 'object'>,)
>>>>> object.__bases__
>> ()
>>>>> type(object)
>> <type 'type'>
>>
>> Christian
> 
> And just to clarify that I do really understand what this means, I
> gather that what it entails is that 'type' is an instance of itself
> just from a conceptual point of view.

In regard to their creation, yes.  But thereafter, isinstance(type, 
type) is as concretely True as for anything.

tjr


> In other words, the code for the
> (meta)class 'type' is created statically by object code (compiled C
> code) before the python runtime is initiated (you referred to it as
> the interpreter bootstrapping phase.) I also guess that this code sets
> __class__ and __metaclass__ to the 'type' object itself (I am guessing
> a self-referencial pointer in C.) While I just am hypothesizing on the
> details, please let me know if you sense that I have misunderstood any
> essential part of your explanation.
> 
> Thanks,
> 
> Lukas



From __peter__ at web.de  Fri May 29 02:27:34 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 29 May 2009 08:27:34 +0200
Subject: Python, Tkinter and popen problem
References: <mailman.803.1243448972.8015.python-list@python.org>
	<gvk2br$6bg$03$1@news.t-online.com>
	<mailman.811.1243469678.8015.python-list@python.org>
	<gvlnh2$n7t$02$1@news.t-online.com>
	<mailman.855.1243537386.8015.python-list@python.org>
Message-ID: <gvnv7f$p5f$00$1@news.t-online.com>

norseman wrote:

> The direct question comes back to:
> How does one force a sync or flush() to take effect in Python with
> Tkinter in use? Or just in Python period. The keyword being force.

Here's some truly minimal code which shows the same buffering behaviour:

$ cat master.py
#!/usr/bin/env python
import os
for line in os.popen("./child.py"):
    print "-->", line.strip()

$ cat child.py
#!/usr/bin/env python
import time

for i in range(5):
    print i
    time.sleep(.2)

On Linux you can work around it with pexpect:

$ cat master2.py
#!/usr/bin/env python
import pexpect
for line in pexpect.spawn("./child.py"):
    print "-->", line.strip()

On Windows, I don't know.

Peter




From seattlehanks at yahoo.com  Fri May 29 02:31:11 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Thu, 28 May 2009 23:31:11 -0700 (PDT)
Subject: How can 'type' be an instance of itself?
References: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>
	<mailman.860.1243553846.8015.python-list@python.org>
	<9769ee93-929a-4af7-8014-2f641cb52a2f@y6g2000prf.googlegroups.com>
	<mailman.870.1243577260.8015.python-list@python.org>
Message-ID: <81652a27-7415-415f-8487-ba15584e0fe9@x5g2000yqk.googlegroups.com>

On May 28, 11:07?pm, Terry Reedy <tjre... at udel.edu> wrote:
> LittleGrasshopper wrote:
> > On May 28, 4:37 pm, Christian Heimes <li... at cheimes.de> wrote:
> >> LittleGrasshopper wrote:
> >>> This is probably trivial, but it's driving me mad somehow. All (new
> >>> style) classes are instances of 'type' by default, unless a custom
> >>> metaclass is specified. I take this to mean that when a class
>
> type(ob) simply looks up ob.__class__. ?For built-in classes, that is
> all it means.
>
> >>> declaration is found in the code, an instance of 'type' representing
> >>> that class is created by calling type.__init__. What really gets me is
> >>> how can 'type' be an instance of itself. In order to create 'type' we
> >>> would need to call type.__init__, but it seems at this point it
> >>> wouldn't exist. Probably a dumb question, which I hope someone can
> >>> explain in some detail.
>
> Actually, it is type.__new__ that creates the new object (as is true of
> all classes). ?.__init__, when present, initializes mutable objects
> already created by .__new__.
>
> This is a perceptive, not a dumb question.
>
> >> The classes 'type' and 'object' are written in C. You can do things in C
> >> code that aren't possible from pure Python code. The circular
> >> dependencies between 'type' and 'object' are created during the boot
> >> strapping phase of the interpreter.
>
> In other words, the interpreter is god with respect to built-in objects.
> ? For instance, the interpreter has to mutate 'immutable' objects in
> order to give then their immutable (thereafter) values. ?So setting
> type.__class__ to type itself is no more of a big deal than the above,
> or setting any builtin.__class__ to type.
>
> >>>>> type(type)
> >> <type 'type'>
> >>>>> type.__bases__
> >> (<type 'object'>,)
> >>>>> object.__bases__
> >> ()
> >>>>> type(object)
> >> <type 'type'>
>
> >> Christian
>
> > And just to clarify that I do really understand what this means, I
> > gather that what it entails is that 'type' is an instance of itself
> > just from a conceptual point of view.
>
> In regard to their creation, yes. ?But thereafter, isinstance(type,
> type) is as concretely True as for anything.
>
> tjr
>
> > In other words, the code for the
> > (meta)class 'type' is created statically by object code (compiled C
> > code) before the python runtime is initiated (you referred to it as
> > the interpreter bootstrapping phase.) I also guess that this code sets
> > __class__ and __metaclass__ to the 'type' object itself (I am guessing
> > a self-referencial pointer in C.) While I just am hypothesizing on the
> > details, please let me know if you sense that I have misunderstood any
> > essential part of your explanation.
>
> > Thanks,
>
> > Lukas
>
>

Terry,

Thanks a lot for clarifying this further. I believe I understand
exactly what is going on now. What you say about the C compiler being
god (which is basically saying what Christian said in an even more
emphatic way) really puts things in perspective.

Regards,

Lukas


From __peter__ at web.de  Fri May 29 02:35:33 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 29 May 2009 08:35:33 +0200
Subject: python list pattern matching?
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
	<mailman.859.1243551475.8015.python-list@python.org>
Message-ID: <gvnvme$p5f$00$2@news.t-online.com>

Terry Reedy wrote:

>  >>> a,b,*rest = list(range(10))

The list() call is superfluous.



From gabriel.rossetti at arimaz.com  Fri May 29 02:47:35 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Fri, 29 May 2009 08:47:35 +0200
Subject: DB-API execute params, am I missing something?
In-Reply-To: <7826h5F1kcp57U1@mid.uni-berlin.de>
References: <mailman.745.1243338813.8015.python-list@python.org>
	<7826h5F1kcp57U1@mid.uni-berlin.de>
Message-ID: <4A1F8507.8030406@arimaz.com>

Diez B. Roggisch wrote:
> Gabriel Rossetti wrote:
>
>   
>> Hello everyone, I am trying to use dbapi with mysql and I get this error:
>>
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>>   File "<stdin>", line 2, in getUnitParams
>>   File "/var/lib/python-support/python2.5/MySQLdb/cursors.py", line 151,
>> in execute
>>     query = query % db.literal(args)
>> TypeError: int argument required
>>
>> with this code :
>>
>> import MySQLdb
>>
>> def getParams(curs):
>>     curs.execute("select * from param where id=%d", 1001)
>>     return curs.fetchall()
>>
>> cp = MySQLdb.connect(host="localhost",
>>                      port=3306,
>>                      user="root",
>>                      passwd="123",
>>                      db="test")
>>
>> curs = cp.cursor()
>> result = getParams(curs)
>>
>> I checked MySQLdb.paramstyle and it uses "format". I also tried passing
>> (1001,) instead of just 1001 as the param but this changes nothing. What
>> am I doing wrong?
>>     
>
> AFAIK you need to use %s, regardless of what type you pass.
>
> Diez
>   
Ok, thank you, that was the problem. I also learned not to put the 
quotes in the SQL statement (e.g. SELECT * FROM toto WHERE 
toto.name='%s') since the call to literal() adds them :-)

Thank you,
Gabriel


From gabriel.rossetti at arimaz.com  Fri May 29 02:48:45 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Fri, 29 May 2009 08:48:45 +0200
Subject: DB-API execute params, am I missing something?
In-Reply-To: <a5e204d6-29df-4637-81cd-8b8c1f485a1a@k38g2000yqh.googlegroups.com>
References: <mailman.745.1243338813.8015.python-list@python.org>
	<a5e204d6-29df-4637-81cd-8b8c1f485a1a@k38g2000yqh.googlegroups.com>
Message-ID: <4A1F854D.9000505@arimaz.com>

Paul Boddie wrote:
> On 26 Mai, 13:46, Gabriel Rossetti <gabriel.rosse... at arimaz.com>
> wrote:
>   
>> def getParams(curs):
>>     curs.execute("select * from param where id=%d", 1001)
>>     
>
> First of all, you should use the database module's parameter style,
> which is probably "%s" - something I've thought should be deprecated
> for a long time due to the confusion with string substitution that
> this causes, regardless of whether that mechanism is actually used
> internally by the module (as seen in your traceback).
>
> You also have to provide a sequence of parameters: unlike string
> substitution, you cannot provide a single parameter value and expect
> the execute method to do the right thing. Some database modules seem
> to insist on either lists or tuples of parameters, but I think any
> sequence type should work.
>
> Try this:
>
>   curs.execute("select * from param where id=%s", (1001,))
>
> Paul
>   
Thank you for the explanation Paul!

Gabriel


From urbangabo at gmail.com  Fri May 29 02:57:18 2009
From: urbangabo at gmail.com (Gabor Urban)
Date: Fri, 29 May 2009 08:57:18 +0200
Subject: What text editor is everyone using for Python
Message-ID: <f7ac28aa0905282357n1150e0d4r2d187909563a64ba@mail.gmail.com>

Hi guys,

I would like to reflect this issue for the last time, though I found
this thread to be quite inspiring.

In one the last postings about this topic Steven D'Aprano has written:
"As a general rule, menus are discoverable, while
keyboard commands aren't. There's nothing inherent to text editing
functions which makes then inherently undiscoverable,
and KDE apps like kate and kwrite do a reasonable job of making them so."

I agree with this assumption if, and only if we are speaking about
outsider users.

This is a Python mailing list, which supposed to be a forum of people
using the Python programming language. So Python
source is a plain text, so Python interpreter should be a
command-driven application. With no other UI than the plain old
Command Line Intreface.

MOre than that, all we are supposed to be techmen, who does
acknowledge and appreciate the conceot of wrtitten User Manual or
Reference. All we have learned Python from tutorials and not from the menues.

As a summary, any open source editor should be perfect, which is
extensible, optionally language-sensitive, portable, basically
independent of any OS features. THat cuts the list drammatically.

Gabor


From ben+python at benfinney.id.au  Fri May 29 03:41:48 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 29 May 2009 17:41:48 +1000
Subject: What text editor is everyone using for Python
References: <mailman.873.1243580240.8015.python-list@python.org>
Message-ID: <878wkgwe2r.fsf@benfinney.id.au>

Gabor Urban <urbangabo at gmail.com> writes:

> This is a Python mailing list, which supposed to be a forum of people
> using the Python programming language.

Agreed so far.

> As a summary, any open source editor should be perfect, which is
> extensible, optionally language-sensitive, portable, basically
> independent of any OS features. THat cuts the list drammatically.

With this paragraph I can agree.

> So Python source is a plain text, so Python interpreter should be a
> command-driven application.

Huh? The Python interpreter should be a command-line application, true.
But the fact that Python source code is text has nothing to do with
that.

> With no other UI than the plain old Command Line Intreface.

This doesn't follow at all. I am convinced that I'm far more productive
in my full-window editing environment over needing to use a command-line
to do everything. Where does ?should? come into that, and why is a
full-window environment excluded?

If, instead of ?command-line?, you actually mean ?text-mode
full-window console?, I'm still calling you on your non sequitur.
There's nothing about editing text that excludes using a graphical
interface rendered in pixels instead of text characters.

The closest I get to agreement with any of the above is that a
full-window text editing environment should never *require* any
graphical pixellated interface. But to *exclude* it is too much.

> MOre than that, all we are supposed to be techmen, who does
> acknowledge and appreciate the conceot of wrtitten User Manual or
> Reference. All we have learned Python from tutorials and not from the
> menues.

You seem to have a rather exclusionist idea of the Python community,
that does not match my experience at all. Python programmers are women
as well as men. Many Python programmers would not describe themselves as
?technical? people. And I know for a fact many of the good ones
learned by example, not from tutorials.

-- 
 \       ?Courage is resistance to fear, mastery of fear ? not absence |
  `\                        of fear. ?Mark Twain, _Pudd'n'head Wilson_ |
_o__)                                                                  |
Ben Finney


From steve at REMOVE-THIS-cybersource.com.au  Fri May 29 04:01:06 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 08:01:06 GMT
Subject: What text editor is everyone using for Python
References: <mailman.873.1243580240.8015.python-list@python.org>
Message-ID: <003b70c0$0$9673$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 08:57:18 +0200, Gabor Urban wrote:

> In one the last postings about this topic Steven D'Aprano has written:
> "As a general rule, menus are discoverable, while keyboard commands
> aren't. There's nothing inherent to text editing functions which makes
> then inherently undiscoverable, and KDE apps like kate and kwrite do a
> reasonable job of making them so."
> 
> I agree with this assumption if, and only if we are speaking about
> outsider users.

It's not an assumption, it's a conclusion. My assumption is that 
everybody, no matter how experienced they are, will *at some time* be 
looking for some editor functionality without knowing whether or not it 
exists. I've never needed to (say) strip out all comments from a 
document, but if I ever do, if the editor makes functions discoverable, 
I've got a better chance of finding the command I need, rather than 
wasting my time programming something that's been done before.

We all know of experienced system admins who have built-up an amazingly 
detailed amount of knowledge about the systems they've used. They can 
tell you about the most obscure features and functions of a system. But 
put them in a system which is *not quite the same* (say, Ubuntu instead 
of Redhat, or FreeBSD instead of Linux), and they often flounder. All the 
functions they're used to are in a different place, so to speak. And 
there's no easy way to learn that command ABC on one system is precisely 
the same as command XYZ on another.

Only two sorts of people don't benefit from ease of discoverablity: those 
who know everything, and those who never do anything new.


> This is a Python mailing list, which supposed to be a forum of people
> using the Python programming language. So Python source is a plain text,
> so Python interpreter should be a command-driven application. With no
> other UI than the plain old Command Line Intreface.

That Python is command-driven doesn't have *any* implications for the 
editor you use to write Python code. Photo-editing software is mouse-
driven. That doesn't mean that you should be forced to write photo-
editing programs by point-and-click.


> MOre than that, all we are supposed to be techmen, who does acknowledge
> and appreciate the conceot of wrtitten User Manual or Reference. All we
> have learned Python from tutorials and not from the menues.

We're probably better at reading manuals than average people, but that 
doesn't mean we *like* it. That's one of the reasons we use Python: 
nearly everything is discoverable from inside the Python runtime 
environment. We have a wealth of tools for inspecting objects. If you 
want to know what methods an object has, you don't have to look it up in 
the manual, you can inspect it with dir().

Besides, once you've been in the tech industry for long enough, you'll 
learn that the Python documentation is *remarkably* good compared to the 
average technical documentation.


> As a summary, any open source editor should be perfect, which is
> extensible, optionally language-sensitive, portable, basically
> independent of any OS features. THat cuts the list drammatically.

(1) Closed source editors have the same functional requirements as open 
source editors.

(2) If you're waiting for perfection, you'll be waiting forever.

(3) Why independent of the OS? When is the last time you've used a system 
without an OS? Forth programmers in the 1970s used an editor that was OS 
independent -- it managed files using its own unique file structure, 
managed memory itself, etc. Why do you want to go back there?


-- 
Steven


From deets at nospam.web.de  Fri May 29 04:02:43 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 29 May 2009 10:02:43 +0200
Subject: AOPython Question
In-Reply-To: <b5ae3174-ef46-452a-96df-c5018bbac31e@21g2000vbk.googlegroups.com>
References: <b5ae3174-ef46-452a-96df-c5018bbac31e@21g2000vbk.googlegroups.com>
Message-ID: <789j53F1lg3ikU1@mid.uni-berlin.de>

Roastie schrieb:
> I installed the AOPython module:
> 
>    % easy_install aopython
> 
> That left an aopython-1.0.3-py2.6.egg at
> C:\mystuff\python\python_2.6.2\Lib\site-packages.
> 
> I entered the interpreter:
> 
>>>> import aopython
>>>>
> 
> All is well.
> 
> But I was uncomfortable, since I was used to seeing directories
> of Python code for modules in site-packages, so I decided
> to read about eggs:
> http://mrtopf.de/blog/python_zope/a-small-introduction-to-python-eggs/
> 
> The article told me to run:
>     % easy_install aopython-1.0.3-py2.6.egg

Did you run that in the site-packages-directory? If yes, that was a 
mistake. The above command is supposed to work on downloaded eggs that 
lie around somewhere.

> The result was a long list of error messages and removal
> of my egg, and Python could no longer use the AOPython module.
> 
> So, I'm looking for a better reference for telling me about eggs and
> modules in site-packages.

You did everything alright the first time.

Diez


From lie.1296 at gmail.com  Fri May 29 04:53:48 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Fri, 29 May 2009 08:53:48 GMT
Subject: What text editor is everyone using for Python
In-Reply-To: <mailman.858.1243549462.8015.python-list@python.org>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>	<4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com>
	<mailman.858.1243549462.8015.python-list@python.org>
Message-ID: <woNTl.14450$y61.392@news-server.bigpond.net.au>

norseman wrote:
> jeffFromOz wrote:
>> On May 26, 10:07 pm, Lacrima <Lacrima.Ma... at gmail.com> wrote:
>>> I am new to python.
>>> And now I am using trial version of Wing IDE.
>>> But nobody mentioned it as a favourite editor.
>>> So should I buy it when trial is expired or there are better choices?
>>
>> No one mentioned textmate either  . a brilliant text editor with
>> python templates, and bundles, syntax highlighting, etc.  We use
>> wingIDE for debugging and it seems fine, except for the weird way it
>> corrupts the displayed text.
> ===========================
> 
> BOTTOM LINES:
> 
> Whatever they learned on.
> Whatever they are trying out at the moment (for the adventurous types)
> 
> 
> Suggestion:
> Take a look at the top two most used OS you use and learn the default
> (most often available) text editors that come with them.

Which means Notepad on Windows?


From jonas.esp at googlemail.com  Fri May 29 05:34:53 2009
From: jonas.esp at googlemail.com (Kless)
Date: Fri, 29 May 2009 02:34:53 -0700 (PDT)
Subject: Global variables from a class
Message-ID: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>

I usually use a class to access to global variables. So, which would
be the correct way to set them --since the following classes--:

--------------------
class Foo:
   var = 'lala'

class Bar:
   def __init__(self):
      self.var = 'lele'
--------------------

Or is it the same?


From ldo at geek-central.gen.new_zealand  Fri May 29 05:45:13 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 29 May 2009 21:45:13 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<gvljmv$8hg$5@lust.ihug.co.nz>
	<003a5518$0$9673$c3e8da3@news.astraweb.com>
	<gvmu98$25d$1@lust.ihug.co.nz>
	<003af57e$0$9673$c3e8da3@news.astraweb.com>
	<gvnfjj$c0d$2@lust.ihug.co.nz>
	<003b3d8c$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <gvoar9$s27$1@lust.ihug.co.nz>

In message <003b3d8c$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano 
wrote:

> On Fri, 29 May 2009 14:00:19 +1200, Lawrence D'Oliveiro wrote:
> 
>> In message <003af57e$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano
>> wrote:
>> 
>>> On Fri, 29 May 2009 09:04:39 +1200, Lawrence D'Oliveiro wrote:
>>> 
>>>> In message <003a5518$0$9673$c3e8da3 at news.astraweb.com>, Steven
>>>> D'Aprano wrote:
>>>> 
>>>>> On Thu, 28 May 2009 20:58:07 +1200, Lawrence D'Oliveiro wrote:
>>>>> 
>>>>>> In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven
>>>>>> D'Aprano wrote:
>>>>>> 
>>>>>>> A good UI standard should mean that:
>>>>>>> 
>>>>>>> * all functionality should be discoverable without reading the
>>>>>>> manual;
>>>>>> 
>>>>>> Which means no scripting languages are allowed?
>>>>> 
>>>>> "Should", not "must".
>>>> 
>>>> If you meant "may or may not", why don't you say "may or may not"?
>>> 
>>> "Should" does not mean "may or may not".
>> 
>> I'm not sure how there is supposed to be a difference in this context.
>> "All people should fly by flapping their arms, except where this is
>> physically impossible". You're asking for something that is infeasible
>> with most current editors, if not all of them.
> 
> On the remote chance that you're not trolling, I deny that
> discoverablity is "infeasible" ...

On the remote chance you're not trolling, let me point out politely that it 
is for scriptability.



From ldo at geek-central.gen.new_zealand  Fri May 29 05:46:13 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 29 May 2009 21:46:13 +1200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
	<gvkoep$oii$3@lust.ihug.co.nz>
	<mailman.819.1243494051.8015.python-list@python.org>
	<gvljl9$8hg$4@lust.ihug.co.nz>
	<mailman.867.1243574504.8015.python-list@python.org>
Message-ID: <gvoat5$s27$2@lust.ihug.co.nz>

In message <mailman.867.1243574504.8015.python-list at python.org>, Dennis Lee 
Bieber wrote:

> On Thu, 28 May 2009 20:57:13 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
> 
>>> 
>>>    >>> db.literal((... "%wildcard%" ...))
>>>    (... "'%wildcard%'" ...)
>> 
>> Doesn't look like it worked, does it?
> 
> If the problem is that you have /user/ input that may have a % sign
> that should NOT be treated as a wildcard, the solution is to train said
> user...

Sounds like a good solution to SQL-injection vulnerabilities, isn't it? 
Wonder why no-one thought of that before?



From piet at cs.uu.nl  Fri May 29 05:49:04 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 29 May 2009 11:49:04 +0200
Subject: Python, Tkinter and popen problem
References: <mailman.803.1243448972.8015.python-list@python.org>
	<gvk2br$6bg$03$1@news.t-online.com>
	<mailman.811.1243469678.8015.python-list@python.org>
	<gvlnh2$n7t$02$1@news.t-online.com>
	<mailman.855.1243537386.8015.python-list@python.org>
Message-ID: <m2d49sck8f.fsf@cs.uu.nl>

>>>>> norseman <norseman at hughes.net> (n) wrote:

>n> I have tried both and Popen2.popen2().
>n> os.popen runs both way, contrary to docs.

What do you mean `os.popen runs both way'?

>n> # master.py
>n> import os
>n> #                both lines work same

Of course, because 'r' is the default, and the bufsize for reading the
pipe only influences the performance.

>n> #xx= os.popen("/mnt/mass/py/z6.py").readlines()
>n> xx= os.popen("/mnt/mass/py/z6.py",'r',1).readlines()
>n> #                I had hoped small buffer would force a sync (flush())
>n> #                No such luck.

First, there is a difference between sync and flush. flush is writing
out any output that is buffered in the application program for that
file. Sync is writing out buffers (cache) in the operating system (to the
disc, network connection or similar). We are talking here about
flushing, not syncing. As we deal with a pipe, sync is not applicable.

Furthermore, whatever you do in the master program, such as setting the
buffer size has nothing to do with what happens in the child, so it will
not influence the flushing behaviour of the child. The only way to
influence that would be to use a pty instead of a pipe, because most
code uses a different buffering strategy for ttys and ptys compared to
files and pipes.

The next error in your program is that you use readlines()
This reads ALL input from your pipe before it proceeds. So essentially
it waits until the child process is finished and therefore gives you the
impression that it doesn't flush(). But it is not the child that is the
problem it is your master.

What you should do is take the pipe and do a readline()/print loop.

#xx= os.popen("/mnt/mass/py/z6.py")

# popen is deprecated. Replace with subprocess:
from subprocess import Popen, PIPE
xx = Popen(["/mnt/mass/py/z6.py"], stdout=PIPE).stdout

while True:
    line = xx.readline()
    if not line: break
    print "\t" + line,

The obvious:

for l in xx:
    print "\t" + l,

doesn't work as the iterator for a file, including pipes, does a
read ahead (see the doc on file.next()) and therefore is not suitable for
interactive use.

>n> The direct question comes back to:

>n> How does one force a sync or flush() to take effect in Python with
>n> Tkinter in use? Or just in Python period. The keyword being force.

So it should be clear by now that the answer is to use flush().
And make sure you read AND process the flushed output in a proper way.

By the way, you have a nasty habit of using very unclear language to
pose your problems in this newsgroup/mailing list, instead of writing a
concise description and giving small examples of what code causes the
problem. This makes it extremely difficult to help you. I had to read
your messages at least 5 times to get an idea of what you were doing and
what the problem was that you wanted to solve.

Maybe you are dyslectic or something similar, in which case I apologize.
But anyway, I think you should learn to express yourself more clearly.
There are also courses for that.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From dahl.joachim at gmail.com  Fri May 29 05:52:15 2009
From: dahl.joachim at gmail.com (Joachim Dahl)
Date: Fri, 29 May 2009 02:52:15 -0700 (PDT)
Subject: FILE object in Python3.0 extension modules
Message-ID: <ce7a9fa5-0e35-47b4-bd4e-a68415aca1d5@h11g2000yqb.googlegroups.com>

In Python2.x, I used PyFile_Check(obj) to check if a parameter was a
file object.

Now, in Python3.0 the same object (obtained as open('file.bin','wb'))
is an
io.BufferedWriter object.

How do I perform type checking for such an object in the extension
module,
and how do I extract a FILE * object from it?  I browsed the C API
documentation,  but
couldn't find an answer.

The purpose is to dump the contents of a Python extension type to disk
as
binary data using C's fwrite() function.


From google at mrabarnett.plus.com  Fri May 29 05:58:11 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 29 May 2009 10:58:11 +0100
Subject: Tkinter file dialog
In-Reply-To: <9c8c445f0905281948r537a53f9j63bc5c2209d37145@mail.gmail.com>
References: <9c8c445f0905281948r537a53f9j63bc5c2209d37145@mail.gmail.com>
Message-ID: <4A1FB1B3.1010100@mrabarnett.plus.com>

Ronn Ross wrote:
> I'm using Tkinter file selector to get a direcotry path. I'm using:
> 
> self.file = tkFileDialog.askdirectory(title="Please select your directory")
>         print file
> 
> but all it prints out is:
> <type 'file'>
> 
> How would I print the directory path?
> 
Perhaps you meant:

     self.file = tkFileDialog.askdirectory(title="Please select your 
directory")
     print self.file


From piet at cs.uu.nl  Fri May 29 05:58:33 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 29 May 2009 11:58:33 +0200
Subject: Global variables from a class
References: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
Message-ID: <m28wkgcjsm.fsf@cs.uu.nl>

>>>>> Kless <jonas.esp at googlemail.com> (K) wrote:

>K> I usually use a class to access to global variables. So, which would
>K> be the correct way to set them --since the following classes--:

>K> --------------------
>K> class Foo:
>K>    var = 'lala'

>K> class Bar:
>K>    def __init__(self):
>K>       self.var = 'lele'
>K> --------------------

>K> Or is it the same?

I don't see any global variable in your code. 
var is a class variable (attribute) in Foo, whereas in Bar var is an
instance variable (attribute). These are two different things. However a
class variable acts as a kind of default for an instance variable. If
all your instances have the same value for var, Foo is a good way to
accomplish this. If they are all different, the Bar is the way to go.

You can also mix them if several of the instances use the same value
'lala' but some need 'lele' or sometime later in the life of the instance
the value will be changed to 'lele'

class Bletch:
    var = 'lala'

    def update(self):
        self.var = 'lele'

In this case it is a matter of taste whether you use the Foo or the Bar
way.

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From javier.collado at gmail.com  Fri May 29 06:04:53 2009
From: javier.collado at gmail.com (Javier Collado)
Date: Fri, 29 May 2009 12:04:53 +0200
Subject: Global variables from a class
In-Reply-To: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
References: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
Message-ID: <c83cde5a0905290304i1806ae12gaa81b2e5c2f3a19a@mail.gmail.com>

Hello,

First thing is a class variable (one for every instance) and second
one an instance variable (one per instance).

For further information, please take a look at:
http://diveintopython.org/object_oriented_framework/class_attributes.html

Best regards,
   Javier

2009/5/29 Kless <jonas.esp at googlemail.com>:
> I usually use a class to access to global variables. So, which would
> be the correct way to set them --since the following classes--:
>
> --------------------
> class Foo:
> ? var = 'lala'
>
> class Bar:
> ? def __init__(self):
> ? ? ?self.var = 'lele'
> --------------------
>
> Or is it the same?
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From marius.s.retegan at gmail.com  Fri May 29 06:44:30 2009
From: marius.s.retegan at gmail.com (Marius Retegan)
Date: Fri, 29 May 2009 12:44:30 +0200
Subject: extract to dictionaries
In-Reply-To: <4A1F27B1.7040005@islandtraining.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
	<4A1F27B1.7040005@islandtraining.com>
Message-ID: <52298ae10905290344s8d6ef34ma6f16aa2f51be9e5@mail.gmail.com>

Hi,

On Fri, May 29, 2009 at 2:09 AM, Gary Herron <gherron at islandtraining.com>wrote:

> Marius Retegan wrote:
>
>> Hello
>> I have simple text file that I have to parse. It looks something like
>> this:
>>
>> parameters1
>>     key1 value1
>>     key2 value2
>> end
>>
>> parameters2
>>     key1 value1
>>     key2 value2
>> end
>>
>> So I want to create two dictionaries parameters1={key1:value1,
>> key2:value2} and the same for parameters2.
>>
>> I would appreciate any help that could help me solve this.
>> Thank you
>>
>>
>
> This looks like a homework problem.


It's not. I'm passed homework age.


>   But even if it's not, you are not likely to find someone who is willing
> to put more work into this problem than you have.
> So  why don't you show us what you've tried, and see if someone is willing
> to make suggestions or answer specific question about your attempt at a
> solution?
>

I don't now if posting a code that gets into a while loop and never stops
would demonstrate to you that I've tried. Be assured that before posting to
the list I did try to solve it myself, because I knew that I might get an
answer like RTFM or similar.
Maybe I'm not smart enough, but I can't make python to start reading after
the "parameter1" line and stop at the "end" line. That's all I want a small
piece of pseudocode to do just that.

Thanks


>
> Gary Herron
>
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From insfor at gmail.com  Fri May 29 06:44:56 2009
From: insfor at gmail.com (Sergey Dikovitsky)
Date: Fri, 29 May 2009 13:44:56 +0300
Subject: PYTHONPATH var
Message-ID: <fd06ce4c0905290344k2d03dcc0t580b2022526c04e2@mail.gmail.com>

Hi guys. I have a question regarding runtime definition of the variable
PYTHONPATH. Do you know how without modifying of source code change the
value for this var. Value stores in the system var sys.path, but the first
item of this list, path[0], is the directory containing the script that was
used to invoke the Python interpreter. We need to change this value which
allows to us import scripts first from directory containing newest hotfix
scripts without replacing original project scripts. One of the variant is to
create script which will modify this var and insert line with import this
script into each project script. So the question does another way exist? For
example, parameter or argument for python launcher.
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From insfor at gmail.com  Fri May 29 06:50:54 2009
From: insfor at gmail.com (insfor at gmail.com)
Date: Fri, 29 May 2009 03:50:54 -0700 (PDT)
Subject: PYTHONPATH var
Message-ID: <20ab0178-1967-4be1-a4f3-e817c94a4339@z14g2000yqa.googlegroups.com>

Hi guys. I have a question regarding runtime definition of the
variable PYTHONPATH. Do you know how without modifying of source code
change the value for this var. Value stores in the system var
sys.path, but the first item of this list, path[0], is the directory
containing the script that was used to invoke the Python interpreter.
We need to change this value which allows to us import scripts first
from directory containing newest hotfix scripts without replacing
original project scripts. One of the variant is to create script which
will modify this var and insert line with import this script into each
project script. So the question does another way exist? For example,
parameter or argument for python launcher.


From mail at microcorp.co.za  Fri May 29 07:00:07 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 29 May 2009 13:00:07 +0200
Subject: Tkinter file dialog
References: <9c8c445f0905281948r537a53f9j63bc5c2209d37145@mail.gmail.com>
Message-ID: <001601c9e04c$a3b5b260$0d00a8c0@Hendrik>

 Ronn Ross  wrote:

>I'm using Tkinter file selector to get a direcotry path. I'm using:
>
>self.file = tkFileDialog.askdirectory(title="Please select your directory")
>        print file
>
>but all it prints out is:
><type 'file'>
>
>How would I print the directory path?

try doing:

self.filename = tkFileDialog.askopenfilename(title = 'this is a
message',initialdir='./' )

and see what happens

- Hendrik



From benjamin at python.org  Fri May 29 07:48:26 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Fri, 29 May 2009 11:48:26 +0000 (UTC)
Subject: FILE object in Python3.0 extension modules
References: <ce7a9fa5-0e35-47b4-bd4e-a68415aca1d5@h11g2000yqb.googlegroups.com>
Message-ID: <loom.20090529T114655-291@post.gmane.org>

Joachim Dahl <dahl.joachim <at> gmail.com> writes:
> 
> How do I perform type checking for such an object in the extension
> module,
> and how do I extract a FILE * object from it?  I browsed the C API
> documentation,  but
> couldn't find an answer.

You use PyObject_IsInstance to test if the object is an instance of io.IOBase.






From rhodri at wildebst.demon.co.uk  Fri May 29 08:10:47 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 29 May 2009 13:10:47 +0100
Subject: extract to dictionaries
In-Reply-To: <52298ae10905290344s8d6ef34ma6f16aa2f51be9e5@mail.gmail.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
	<4A1F27B1.7040005@islandtraining.com>
	<52298ae10905290344s8d6ef34ma6f16aa2f51be9e5@mail.gmail.com>
Message-ID: <op.uuoxf9kpa8ncjz@gnudebst>

On Fri, 29 May 2009 11:44:30 +0100, Marius Retegan  
<marius.s.retegan at gmail.com> wrote:

> Hi,
>
> On Fri, May 29, 2009 at 2:09 AM, Gary Herron  
> <gherron at islandtraining.com>wrote:
>
>> Marius Retegan wrote:
>>
>>> Hello
>>> I have simple text file that I have to parse. It looks something like
>>> this:
>>>
>>> parameters1
>>>     key1 value1
>>>     key2 value2
>>> end
>>>
>>> parameters2
>>>     key1 value1
>>>     key2 value2
>>> end
>>>
>>> So I want to create two dictionaries parameters1={key1:value1,
>>> key2:value2} and the same for parameters2.
>>>
>>> I would appreciate any help that could help me solve this.
>>> Thank you
>>>
>>>
>>
>> This looks like a homework problem.
>
>
> It's not. I'm passed homework age.
>
>
>>   But even if it's not, you are not likely to find someone who is  
>> willing
>> to put more work into this problem than you have.
>> So  why don't you show us what you've tried, and see if someone is  
>> willing
>> to make suggestions or answer specific question about your attempt at a
>> solution?
>>
>
> I don't now if posting a code that gets into a while loop and never stops
> would demonstrate to you that I've tried.

It would have.  At the very least, it would have told us that you've
missed a common idiom.

> Be assured that before posting to
> the list I did try to solve it myself, because I knew that I might get an
> answer like RTFM or similar.

Not posting code (or code snippets at least) makes it more likely that  
you'll
be told to RTFM, you do realise!

> Maybe I'm not smart enough, but I can't make python to start reading  
> after
> the "parameter1" line and stop at the "end" line. That's all I want a  
> small
> piece of pseudocode to do just that.


I'd be tempted to do it like this

dict_of_dicts = {}
current_dict = {}
current_name = "dummy"

f = open(filename)
for line in f:
   # Do something to skip blank lines
   if line == '\n':
     continue

   # A normal 'key value' pair?
   if line.startswith(' '):
     # Yup.  Split apart the key and value,
     # and add them to the current dictionary
     current_dict.update([line.split()])
   elif line == 'end':
     # Wrap up what we've got and save the dictionary
     dict_of_dicts[current_name] = current_dict
     current_name = dummy
     current_dict = {}
   else:
     # New section.  Really ought to whinge if
     # we haven't ended the old section.
     current_name = line.strip()
     current_dict = {}

You can then pull the parameter sets you want out of
dict_of_dicts (you can probably think of a more meaningful
name for it, but I don't know the context you're working in).
In real code I would use regular expressions rather than
`startswith` and the equality because they cope more easily
with tabs, newlines and other 'invisible' whitespace.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Fri May 29 08:15:03 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 29 May 2009 13:15:03 +0100
Subject: extract to dictionaries
In-Reply-To: <op.uuoxf9kpa8ncjz@gnudebst>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
	<4A1F27B1.7040005@islandtraining.com>
	<52298ae10905290344s8d6ef34ma6f16aa2f51be9e5@mail.gmail.com>
	<op.uuoxf9kpa8ncjz@gnudebst>
Message-ID: <op.uuoxndika8ncjz@gnudebst>

On Fri, 29 May 2009 13:10:47 +0100, Rhodri James  
<rhodri at wildebst.demon.co.uk> wrote:

>      current_name = dummy

Gah!  I meant, of course,
       current_name = 'dummy'

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From john.center at villanova.edu  Fri May 29 08:35:06 2009
From: john.center at villanova.edu (John Center)
Date: Fri, 29 May 2009 05:35:06 -0700 (PDT)
Subject: Problem building 64-bit python 2.6.2 on Solaris 10
References: <b53cac20-3d5f-4b39-ad2c-daf954ab39d7@s28g2000vbp.googlegroups.com>
	<4a1f0a2c$0$30886$9b622d9e@news.freenet.de>
Message-ID: <d618518b-540c-46f1-aebc-576667da030b@o14g2000vbo.googlegroups.com>

On May 28, 6:03?pm, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > I think the problem is it should be built with v9.S for 64-bit, not
> > v8.S. ?Is that correct? ?If so, how do I get it to use the right one?
>
> The Solaris dynamic loader can't find it. Set LD_LIBRARY_PATH or
> LD_RUN_PATH appropriately, or use crle(8).
>
> Regards,
> Martin

Hi Martin,

I'm not sure I understand.  It appears that cc is compiling the wrong
module, v8.S.  It should be compiling v9.S.  The errors are being
reported by fbe, the Sun Studio assembler, not ld.  I think there must
be a place to specify which I want to use, but I don't understand the
python build environment well enough to know where to do it.

You may be right about the first error.  It's being reported by ld,
but -L/opt/openssl/lib/sparcv9 & -R/opt/openssl/lib/sparcv9 are being
passed to cc.  It is able to find -lssl & -lcrypto, but I think python
itself doesn't use the openssl libraries.  Since I see the chain
"ld.so.1: python: fatal: libssl.so.0.9.8: open failed: No such file or
directory", which I think means python itself doesn't know where they
are at.  I checked python & libpython.so with ldd & neither uses
libssl.so.  It seems to me there should be another way to tell python
where to find it to build the module.  Does this make sense?

Thanks for your help.

    -John


From steve at REMOVE-THIS-cybersource.com.au  Fri May 29 08:42:53 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 12:42:53 GMT
Subject: Global variables from a class
References: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
	<mailman.883.1243594929.8015.python-list@python.org>
Message-ID: <003bb2cb$0$9673$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 12:04:53 +0200, Javier Collado wrote:

> Hello,
> 
> First thing is a class variable (one for every instance) and second one
> an instance variable (one per instance).

One of these things don't belong:

A string variable is a variable holding a string.
A float variable is a variable holding a float.
An int variable is a variable holding an int.
A list variable is a variable holding a list.
A "class variable" is an attribute of a class object, holding an
  object of arbitrary type, which is shared by all instances 
  of the class.

Please don't use the term "class variable" to mean class attribute.



-- 
Steven


From aahz at pythoncraft.com  Fri May 29 08:44:14 2009
From: aahz at pythoncraft.com (Aahz)
Date: 29 May 2009 05:44:14 -0700
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
	<c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com>
	<mailman.717.1243258005.8015.python-list@python.org>
Message-ID: <gvolau$hvn$1@panix3.panix.com>

In article <mailman.717.1243258005.8015.python-list at python.org>,
Tim Chase  <python.list at tim.thechases.com> wrote:
>
>To stave off this problem, I often use:
>
>   values = [
>    data['a'],
>    data['b'],
>    data['c'],
>    data['d'],
>    data['e'],
>    data['f'],
>    data['g'],
>    ]
>   params = ', '.join('%s' for _ in values)
>   query = """
>     BEGIN;
>       INSERT INTO table
>         (a,b,c,d,e,f,g)
>       VALUES (%s);
>     COMMIT;
>     """ % params
>   self.db.execute(query, values)

How do you handle correct SQL escaping?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From aahz at pythoncraft.com  Fri May 29 08:53:37 2009
From: aahz at pythoncraft.com (Aahz)
Date: 29 May 2009 05:53:37 -0700
Subject: Syntax highlighting,
	round 42 (was Re: What text editor is everyone using for Python)
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
Message-ID: <gvolsh$fml$1@panix3.panix.com>

In article <gvg5d7$382$2 at lust.ihug.co.nz>,
Lawrence D'Oliveiro  <ldo at geek-central.gen.new_zealand> wrote:
>In message <pan.2009.05.26.06.39.41 at REMOVE.THIS.cybersource.com.au>, Steven 
>D'Aprano wrote:
>> On Tue, 26 May 2009 18:31:56 +1200, Lawrence D'Oliveiro wrote:
>>> In message <d6d05d39-98e7-4c28-
>>> b201-4b2445732ab4 at v35g2000pro.googlegroups.com>, LittleGrasshopper
>>> wrote:
>>>> 
>>>> ... I am looking for suitable syntax files for [editor of choice] ...
>>> 
>>> I don't understand why people need "syntax files" to use a text editor.
>> 
>> Do you want syntax highlighting?
>
>Why?

Didn't we have this discussion just a few weeks ago, when I said that
highlighting made my eyes bleed?  [....]  Oh, Gooja sez that we did it at
the beginning of February, so almost four months.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From jeanmichel at sequans.com  Fri May 29 08:55:34 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 29 May 2009 14:55:34 +0200
Subject: Global variables from a class
In-Reply-To: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
References: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
Message-ID: <4A1FDB46.3080102@sequans.com>

Kless wrote:
> I usually use a class to access to global variables. So, which would
> be the correct way to set them --since the following classes--:
>
> --------------------
> class Foo:
>    var = 'lala'
>
> class Bar:
>    def __init__(self):
>       self.var = 'lele'
> --------------------
>
> Or is it the same?
>   

This form is the most suited for what your doing:

> class Foo:
>   var = 'lala'

It is a good practice to place your globals into a class (making them non global by the way). It helps also writing good documentation in docstrings.

I would add:

> class Foo:
>   """Hold the secrets of eternity"""
>   var = 'lala'
>   """One variable"""
>   ANY_CONSTANT = 14
>   """The universal answer to all questions"""

Having strong naming convention also helps a lot.

Jean-Michel

PS: FYI, in the second form, var is an instance variable, and you need to create an instance to access it => Bar().var while Foo.var is enough for the first form.



From steve at REMOVE-THIS-cybersource.com.au  Fri May 29 08:55:51 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 12:55:51 GMT
Subject: PYTHONPATH var
References: <20ab0178-1967-4be1-a4f3-e817c94a4339@z14g2000yqa.googlegroups.com>
Message-ID: <003bb5d5$0$9673$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 03:50:54 -0700, insfor wrote:

> Hi guys. I have a question regarding runtime definition of the variable
> PYTHONPATH. Do you know how without modifying of source code change the
> value for this var.

"Syntax error:  sentence seems to be a question, but is missing a 
question mark."

To answer your question, PYTHONPATH is an environment variable. You set 
it in your shell. For example, I use the bash shell under Linux, and in 
my .bashrc file I have this line:

export PYTHONPATH=/home/steve/python/

Every time I log in, the shell sets the environment variable to the 
pathname /home/steve/python/, and then when Python runs, it appends that 
path to sys.path. I don't have to modify any Python source code.



> Value stores in the system var sys.path, but the
> first item of this list, path[0], is the directory containing the script
> that was used to invoke the Python interpreter. We need to change this
> value which allows to us import scripts first from directory containing
> newest hotfix scripts without replacing original project scripts. One of
> the variant is to create script which will modify this var and insert
> line with import this script into each project script. So the question
> does another way exist? For example, parameter or argument for python
> launcher.

I don't understand what you are actually trying to say here. Perhaps you 
can explain a little bit more carefully?


However, trying to guess what you want, PYTHONPATH doesn't *replace* 
sys.path, it appends to the end of it. This is usually the right thing to 
do. However, sys.path is an ordinary list. If you want to modify it, you 
can do so:

import sys
sys.path[0] = '/some/other/path'



-- 
Steven


From twic at urchin.earth.li  Fri May 29 08:56:29 2009
From: twic at urchin.earth.li (Tom Anderson)
Date: Fri, 29 May 2009 13:56:29 +0100
Subject: Parsing DTDs
Message-ID: <alpine.DEB.1.10.0905291352130.14054@urchin.earth.li>

Hello!

I would like to parse XML DTDs. The goal is to be able to validate 
XML-like object structures against DTDs in a fairly flexible way, although 
i can get from a parsed DTD to a validation engine myself, so that's not 
an essential feature of the parser (although it would be nice!). What 
should i do?

A bit of googling revealed that the xmlproc package contains a DTD parser 
that looks like it does just what i want, and that xmlproc became PyXML, 
and that PyXML is no longer maintained.

Is there a DTD parser that is being maintained? Or does it not really 
matter that PyXML is no longer maintained, given that it's not like the 
DTD spec has changed very much?

Thanks,
tom

-- 
Many of us adopted the File's slang as our own, feeling that we'd found a
tangible sign of the community of minds we'd half-guessed to be out there.


From davea at ieee.org  Fri May 29 09:00:41 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 29 May 2009 09:00:41 -0400
Subject: Global variables from a class
In-Reply-To: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
References: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
Message-ID: <4A1FDC79.10105@ieee.org>

Kless wrote:
> I usually use a class to access to global variables. So, which would
> be the correct way to set them --since the following classes--:
>
> --------------------
> class Foo:
>    var = 'lala'
>
> class Bar:
>    def __init__(self):
>       self.var = 'lele'
> --------------------
>
> Or is it the same?
>
>   
What Python calls global variables are attributes of a module.  So other 
modules can access them by using the module name, eg..  globalModule.var

If you're trying to make them independent of file name, so others can 
access them without knowing what module they are defined in, you can 
create a class Foo approach.  Then somehow (there are several easy ways) 
you get a reference to that class into each module, and they can use 
Foo.var to access the attributes of the class.  You still have a 
reserved name the other modules need to know, it just doesn't have to be 
a module itself.  And if the data is defined in the initial script, it 
avoids the traps that re-importing the script can cause.

If you pass that Foo as a parameter to your functions, you can avoid 
having Foo being a global variable itself, in each module other than the 
first.

But, to the core of the matter, if there's any chance that the value 
might change in the lifetime of the running program, you should probably 
not be using them as globals at all.  This is where the Bar approach 
helps.  Attributes defined in that way are attributes of an instance of 
Bar, and thus there can be more than one such.  The Bar instance can 
frequently allow you to generalize a program which might otherwise be 
hemmed in by globals.  And instead of passing Foo to functions, you pass 
bar_instance





From djames.suhanko at gmail.com  Fri May 29 09:11:24 2009
From: djames.suhanko at gmail.com (Djames Suhanko)
Date: Fri, 29 May 2009 10:11:24 -0300
Subject: pygame error: file is not a windows bmp file
Message-ID: <fd9e6bba0905290611h292dc830x902220a0d6da789@mail.gmail.com>

Hello, all!
"pygame error: file is not a windows bmp file"

 I couldn't found a solution for this problem.
My python script run fine in local machine using cxfreeze, but don't
work when copied to my live linux system.
If I put bmp image, works fine, but png don't.
Can you help me?
(and sorry my terrible english).

-- 
Djames Suhanko
LinuxUser 158.760


From durumdara at gmail.com  Fri May 29 09:19:39 2009
From: durumdara at gmail.com (Durumdara)
Date: Fri, 29 May 2009 15:19:39 +0200
Subject: Deletion/record visibility error in PG with Python...
In-Reply-To: <9e384ef60905280929t1a8bff86le33ff5f46a0abb05@mail.gmail.com>
References: <9e384ef60905280929t1a8bff86le33ff5f46a0abb05@mail.gmail.com>
Message-ID: <9e384ef60905290619g90b3a68ke9c0d1bb62cfcd8c@mail.gmail.com>

Hi!

Sorry for rtfm mail... I forgot to remove max_usage param in my real
application...

This parameter is limiting the number of cursor usage, and if max reached,
the DBUtils is automatically open a new cursor in the background! This is
break out of the actual transaction context...

Uhhhhh.... I wasted 2 hours to found the bug in another source... :-(

dd

2009/5/28 Durumdara <durumdara at gmail.com>

> Hi!
>
> PGSQL makes me crazy...
>
> I port my apps to PGSQL, and I near to finish - but I got this problem...
>
> Params: PGSQL 8.3, Windows, Pylons, PGDB, DBUTILS...
>
>
> What happened? How I can avoid the cursor changing? How to fix it in my
> transaction?
> I never ask for new cursor, I used same variable in all of my context
> (self.Cur)... :-(
>
> So what is the solution? Drop DBUtils? Or what?
>
> Thanks for your help:
>     dd
>
>
>
>
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From python.list at tim.thechases.com  Fri May 29 09:22:44 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 29 May 2009 08:22:44 -0500
Subject: formating query with empty parameter
In-Reply-To: <gvolau$hvn$1@panix3.panix.com>
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>	<c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com>	<mailman.717.1243258005.8015.python-list@python.org>
	<gvolau$hvn$1@panix3.panix.com>
Message-ID: <4A1FE1A4.2080603@tim.thechases.com>

Aahz wrote:
> Tim Chase  <python.list at tim.thechases.com> wrote:
>> To stave off this problem, I often use:
>>
>>   values = [
>>    data['a'],
>>    data['b'],
>>    data['c'],
>>    data['d'],
>>    data['e'],
>>    data['f'],
>>    data['g'],
>>    ]
>>   params = ', '.join('%s' for _ in values)
>>   query = """
>>     BEGIN;
>>       INSERT INTO table
>>         (a,b,c,d,e,f,g)
>>       VALUES (%s);
>>     COMMIT;
>>     """ % params
>>   self.db.execute(query, values)
> 
> How do you handle correct SQL escaping?

If you dump "query", you see that "params" (possibly a better 
name would be "place_holders") is merely a list of "%s, %s, %s, 
..., %s" allowing the "execute(query, ***values***)" to properly 
escape the values.  The aim is to ensure that 
"count(placeholders) == len(values)" which the OP mentioned was 
the problem.

My second round of code (in my initial post) ensures that

the number of items in the column definition (in this case the 
"a,b,c,d,e,f,g")
is the same as
the number of placeholders
is the same as the number of values.

The column-names should be code-controlled, and thus I don't 
worry about sql escaping them (my own dumb fault here), whereas 
the values may come from an untrusted source and need to be 
escaped.  So the code I use often has a dictionary of

  mapping = {
    "tablefield1": uservalue1,
    "tablefield2": uservalue2,
    ...
    }

which I can then easily add/remove columns in a single place if I 
need, rather than remembering to adjust the query in two places 
(the table-fieldnames and add the extra placeholder) AND the 
building of the "values" parameter.  It also makes it harder to 
mis-sequence them, accidentally making the table-fieldnames 
"a,b,c" and the values list "a,c,b" (which, when I have 20 or so 
fields being updated has happened to me on more than one occasion)

-tkc






From davea at ieee.org  Fri May 29 09:24:27 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 29 May 2009 09:24:27 -0400
Subject: PYTHONPATH var
In-Reply-To: <fd06ce4c0905290344k2d03dcc0t580b2022526c04e2@mail.gmail.com>
References: <fd06ce4c0905290344k2d03dcc0t580b2022526c04e2@mail.gmail.com>
Message-ID: <4A1FE20B.5010001@ieee.org>

Sergey Dikovitsky wrote:
> Hi guys. I have a question regarding runtime definition of the variable
> PYTHONPATH. Do you know how without modifying of source code change the
> value for this var. Value stores in the system var sys.path, but the first
> item of this list, path[0], is the directory containing the script that was
> used to invoke the Python interpreter. We need to change this value which
> allows to us import scripts first from directory containing newest hotfix
> scripts without replacing original project scripts. One of the variant is to
> create script which will modify this var and insert line with import this
> script into each project script. So the question does another way exist? For
> example, parameter or argument for python launcher.
>
>   
I have to guess much of what you're talking about.  So if this is way 
off, try responding with a clearer wording.

PYTHONPATH is an environment variable.  You change that using your 
operating system's scripting language (shell script).

But you're talking about changing the first entry in sys.path, a Python 
list, which is generated from PYTHONPATH and a few other sources.  So it 
must be changed as Python is starting, not in the shell.

It is an ordinary list, and may be changed in the usual way.  So a 
script could start with:
   import sys
   sys.path = ["newpath"] + sys.path

(although you'd probably want to use a variable, not a literal)

But you say "without modifying of source code."  Not clear what that 
means, without you qualifying just which source code is sacrosanct.

It seems you're trying to change the search order for the initial 
script.  But there is no search order.  You give an actual filename to 
the interpreter, and it does not search at all.  So perhaps what you 
really want is to modify the PATH variable before running the script.  
Then the operating system will search for it before trying to execute 
it.  This should work as long as you don't need any other switches on 
the python.exe command line.

You need to specify your system environment (Windows, Linux, ...), and 
probably your Python version.  And make it clearer what your real goal is.



From javier.collado at gmail.com  Fri May 29 09:30:11 2009
From: javier.collado at gmail.com (Javier Collado)
Date: Fri, 29 May 2009 15:30:11 +0200
Subject: Global variables from a class
In-Reply-To: <003bb2cb$0$9673$c3e8da3@news.astraweb.com>
References: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
	<mailman.883.1243594929.8015.python-list@python.org>
	<003bb2cb$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <c83cde5a0905290630o2babedcfo61c6424f90ee0151@mail.gmail.com>

You're right. I agree on that it's important to use proper words.
Thanks for the correction.

Best regards,
    Javier

2009/5/29 Steven D'Aprano <steve at remove-this-cybersource.com.au>:
> On Fri, 29 May 2009 12:04:53 +0200, Javier Collado wrote:
>
>> Hello,
>>
>> First thing is a class variable (one for every instance) and second one
>> an instance variable (one per instance).
>
> One of these things don't belong:
>
> A string variable is a variable holding a string.
> A float variable is a variable holding a float.
> An int variable is a variable holding an int.
> A list variable is a variable holding a list.
> A "class variable" is an attribute of a class object, holding an
> ?object of arbitrary type, which is shared by all instances
> ?of the class.
>
> Please don't use the term "class variable" to mean class attribute.
>
>
>
> --
> Steven
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From james at agentultra.com  Fri May 29 10:09:12 2009
From: james at agentultra.com (J Kenneth King)
Date: Fri, 29 May 2009 10:09:12 -0400
Subject: what I would like python.el to do (and maybe it does)
References: <mailman.714.1243247520.8015.python-list@python.org>
	<85ljolfgaa.fsf@agentultra.com> <m2prdt2cr0.fsf@cs.uu.nl>
Message-ID: <87prdsxapj.fsf@agentultra.com>

Piet van Oostrum <piet at cs.uu.nl> writes:

>>>>>> J Kenneth King <james at agentultra.com> (JKK) wrote:
>
>>JKK> I find that it does work, but unlike SLIME for lisp, it just imports the statement.
>
>>JKK> It confused me at first, but basically the interpreter doesn't provide
>>JKK> any feedback to emacs.
>
>>JKK> Try opening a python source file (start python-mode if you don't have
>>JKK> an autoload hook) and do C-c C-z to bring up the Python
>>JKK> interpreter. Type in a simple assignment statement (like "a = 1 + 2"
>>JKK> without the quotes) into the source file. Then just C-c C-c as
>>JKK> usual. I never get any feedback. Just C-x o to the interpreter and
>>JKK> print out the variable you just defined. It should be there.
>
> What kind of feedback do you expect?

Well, that's the thing -- type a statement into a python interpreter and
you just get a new prompt.

LISP has a REPL, so you get some sort of feedback printed.

However, some sort of visual cue on the emacs side would be nice. Either
just flash the block of code being sent or a minibuffer message would be
nice.

Look for some SLIME tutorial videos on youtube to see some great
interpreter <-> editor interaction.

The stock Python interpreter probably wouldn't cut it close to something
like SLIME in terms of features, but the iPython package might be a
start.


From michele.petrazzo at REMOVE_me_unipex.it  Fri May 29 10:21:03 2009
From: michele.petrazzo at REMOVE_me_unipex.it (Michele Petrazzo)
Date: Fri, 29 May 2009 16:21:03 +0200
Subject: try except inside exec
Message-ID: <gvor0g$679$1@nnrp-beta.newsland.it>

Hi all,
I want to execute a python code inside a string and so I use the exec
statement. The strange thing is that the try/except couple don't catch
the exception and so it return to the main code.
Is there a solution to convert or make this code work?

Thanks,
Michele

My code:

STR = """
err = 0
try:
   def a_funct():
     1/0
except:
   import traceback
   err = traceback.format_exc()
"""

env = {}
exec STR in env
env["a_funct"]()
print env["err"]


My error:
   File "tmp/test_exec.py", line 14, in <module>
     env["a_funct"]()
   File "<string>", line 5, in a_funct
ZeroDivisionError: integer division or modulo by zero


From jeff at jmcneil.net  Fri May 29 10:30:07 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Fri, 29 May 2009 07:30:07 -0700 (PDT)
Subject: how to change response code in CGIHTTPServer.py
References: <2c86f050-8a1b-4124-9cc8-f6666d1bd7dc@s28g2000vbp.googlegroups.com>
Message-ID: <cf5b238d-7ce1-4033-990b-1911b119390d@o20g2000vbh.googlegroups.com>

On May 28, 2:23?pm, Daniel <daniel.watr... at gmail.com> wrote:
> Hello,
>
> Python 2.5.2
> WinXP
>
> I'm using CGIHTTPServer.py and want to return a response code of 400
> with a message in the event that the cgi script fails for some
> reason. ?I notice that
> run_cgi(self):
> executes this line of code,
> self.send_response(200, "Script output follows")
> which overwrites any headers that I print in my cgi. ?Is there some
> way to modify the response code without having to override
> CGIHTTPServer.py?
>
> Thanks,

>>> help (CGIHTTPServer)
...
Note that status code 200 is sent prior to execution of a CGI script,
so
scripts cannot send other status codes such as 302 (redirect).
...
>>>

It sets that header before it even fires off the CGI script and just
pipes the following response to the client.


From castironpi at gmail.com  Fri May 29 10:38:46 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 29 May 2009 07:38:46 -0700 (PDT)
Subject: try except inside exec
References: <gvor0g$679$1@nnrp-beta.newsland.it>
Message-ID: <0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>

On May 29, 8:21?am, Michele Petrazzo
<michele.petrazzo at REMOVE_me_unipex.it> wrote:
> Hi all,
> I want to execute a python code inside a string and so I use the exec
> statement. The strange thing is that the try/except couple don't catch
> the exception and so it return to the main code.
> Is there a solution to convert or make this code work?
>
> Thanks,
> Michele
>
> My code:
>
> STR = """
> err = 0
> try:
> ? ?def a_funct():
> ? ? ?1/0
> except:
> ? ?import traceback
> ? ?err = traceback.format_exc()
> """
>
> env = {}
> exec STR in env
> env["a_funct"]()
> print env["err"]
>
> My error:
> ? ?File "tmp/test_exec.py", line 14, in <module>
> ? ? ?env["a_funct"]()
> ? ?File "<string>", line 5, in a_funct
> ZeroDivisionError: integer division or modulo by zero

The code you posted defines a function, and if the definition of it
raises an exception, it will enter your except clause.  By the way,
you generally should avoid 'bare' except clauses, and specify the type
of error you want to catch, in this case, 'ZeroDivisionError', as you
see (just good practice stuff).

It's not clear from your attempt what your exact goal was.  You
probably mean:

STR = """
class Globals:
   err = 0
def a_funct():
   try:
      1/0
   except ZeroDivisionError:
      import traceback
      Globals.err = traceback.format_exc()
"""

Note that the formatted exception will be available in 'env
["Globals"].err'.  But you could also mean:

exec STR in env
try:
  env["a_funct"]()
except ZeroDivisionError:
  import traceback
  err = traceback.format_exc()

Then the formatted exception will be available in 'err'.  Do you want
the exception-handling to be part of the function you are entering
into 'env'?


From pbewig at gmail.com  Fri May 29 10:41:03 2009
From: pbewig at gmail.com (Phil Bewig)
Date: Fri, 29 May 2009 07:41:03 -0700 (PDT)
Subject: Programming Praxis
Message-ID: <ad58300c-30ee-4bce-8006-f1cd7599993f@r13g2000vbr.googlegroups.com>

Please visit my blog, <a
href="programmingpraxis.wordpress.com">Programming Praxis</a>, which
presents a collection of programming etudes.  Newbies will find
exercises that extend their programming abilities.  Savvy programmers
can use the exercises to sharpen their skills or learn a new
language.  Brave programmers can submit their code to the review of
their colleagues.

<a href="programmingpraxis.wordpress.com">Programming Praxis</a> isn't
a contest.  No points are awarded, no scores are kept.  The exercises
simply provide an opportunity to hone your skills; the effort is its
own reward.

Come join us!


From aahz at pythoncraft.com  Fri May 29 11:22:02 2009
From: aahz at pythoncraft.com (Aahz)
Date: 29 May 2009 08:22:02 -0700
Subject: Network programming ?
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
Message-ID: <gvouiq$fes$1@panix3.panix.com>

In article <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6 at z5g2000vba.googlegroups.com>,
 <thushianthan15 at gmail.com> wrote:
>
>I am planning to develop a chatting software in Python, for my college
>project. I am using Windows Vista. Is it possible to do sockets
>programming in Python ? Any books or websites ?  Also, i want to
>develop a gui for that program. What are the gui tool kits available
>for windows? I already knew about PyGtk and PyQT, but will they work
>properly in Windows platform? Any suggestions?

You likely want to use Twisted, you should at least investigate it.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From gherron at islandtraining.com  Fri May 29 11:22:12 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Fri, 29 May 2009 08:22:12 -0700
Subject: extract to dictionaries
In-Reply-To: <52298ae10905290344s8d6ef34ma6f16aa2f51be9e5@mail.gmail.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>	
	<4A1F27B1.7040005@islandtraining.com>
	<52298ae10905290344s8d6ef34ma6f16aa2f51be9e5@mail.gmail.com>
Message-ID: <4A1FFDA4.10304@islandtraining.com>

Marius Retegan wrote:
> Hi,
>
> On Fri, May 29, 2009 at 2:09 AM, Gary Herron 
> <gherron at islandtraining.com <mailto:gherron at islandtraining.com>> wrote:
>
>     Marius Retegan wrote:
>
>         Hello
>         I have simple text file that I have to parse. It looks
>         something like
>         this:
>
>         parameters1
>             key1 value1
>             key2 value2
>         end
>
>         parameters2
>             key1 value1
>             key2 value2
>         end
>
>         So I want to create two dictionaries parameters1={key1:value1,
>         key2:value2} and the same for parameters2.
>
>         I would appreciate any help that could help me solve this.
>         Thank you
>          
>
>
>     This looks like a homework problem. 
>
>
> It's not. I'm passed homework age.
>  
>
>       But even if it's not, you are not likely to find someone who is
>     willing to put more work into this problem than you have.
>     So  why don't you show us what you've tried, and see if someone is
>     willing to make suggestions or answer specific question about your
>     attempt at a solution?
>
>
> I don't now if posting a code that gets into a while loop and never 
> stops would demonstrate to you that I've tried. Be assured that before 
> posting to the list I did try to solve it myself, because I knew that 
> I might get an answer like RTFM or similar.
> Maybe I'm not smart enough, but I can't make python to start reading 
> after the "parameter1" line and stop at the "end" line. That's all I 
> want a small piece of pseudocode to do just that.

OK.  Assuming you are open a file with something like:
f = open('data', 'r')

Then this will read lines up to the first "parameters" line
for line in f:
    if line.startswith('parameters'):
       break

At this point, line contains 'parameters1\n'.  Do with it as you will.

Then read and process lines until an end line is reached
for line in f:
    if line.beginswith('end'):
        break
    # Here line contains  '    key1 value1\n'.
    # Perhaps use line.strip to remove the white space on each end
    # and k,v =line.split() to split out the two values on the line.

You'll need more:
  A loop to keep the above two going until the end of file
  A way to recognize the end of the file.

Gary Herron

>
> Thanks
>  
>
>
>     Gary Herron
>
>



From aahz at pythoncraft.com  Fri May 29 11:23:00 2009
From: aahz at pythoncraft.com (Aahz)
Date: 29 May 2009 08:23:00 -0700
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
	<mailman.717.1243258005.8015.python-list@python.org>
	<gvolau$hvn$1@panix3.panix.com>
	<mailman.892.1243603377.8015.python-list@python.org>
Message-ID: <gvoukk$eap$1@panix3.panix.com>

In article <mailman.892.1243603377.8015.python-list at python.org>,
Tim Chase  <python.list at tim.thechases.com> wrote:
>Aahz wrote:
>> Tim Chase  <python.list at tim.thechases.com> wrote:
>>> To stave off this problem, I often use:
>>>
>>>   values = [
>>>    data['a'],
>>>    data['b'],
>>>    data['c'],
>>>    data['d'],
>>>    data['e'],
>>>    data['f'],
>>>    data['g'],
>>>    ]
>>>   params = ', '.join('%s' for _ in values)
>>>   query = """
>>>     BEGIN;
>>>       INSERT INTO table
>>>         (a,b,c,d,e,f,g)
>>>       VALUES (%s);
>>>     COMMIT;
>>>     """ % params
>>>   self.db.execute(query, values)
>> 
>> How do you handle correct SQL escaping?
>
>If you dump "query", you see that "params" (possibly a better 
>name would be "place_holders") is merely a list of "%s, %s, %s, 
>..., %s" allowing the "execute(query, ***values***)" to properly 
>escape the values.  The aim is to ensure that 
>"count(placeholders) == len(values)" which the OP mentioned was 
>the problem.

Right, that's what I get for reading code early in the morning.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From emile at fenx.com  Fri May 29 11:49:57 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 29 May 2009 08:49:57 -0700
Subject: extract to dictionaries
In-Reply-To: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
Message-ID: <gvp0b6$k9g$1@ger.gmane.org>

On 5/28/2009 4:03 PM Marius Retegan said...
> Hello
> I have simple text file that I have to parse. It looks something like
> this:
> 
> parameters1
>      key1 value1
>      key2 value2
> end
> 
> parameters2
>      key1 value1
>      key2 value2
> end
> 
> So I want to create two dictionaries parameters1={key1:value1,
> key2:value2} and the same for parameters2.
> 
> I woud appreciate any help that could help me solve this.
> Thank you
> 

Assuming you've read the above into paramFile...

for dictvals in [xx.split() for xx in paramFile.split("end") if xx]:
     locals()[dictvals[0]]=dict(zip(dictvals[1::2],dictvals[2::2]))

You-can't-really-call-this-helping-ly yrs,

Emile



From michele.petrazzo at REMOVE_me_unipex.it  Fri May 29 11:55:01 2009
From: michele.petrazzo at REMOVE_me_unipex.it (Michele Petrazzo)
Date: Fri, 29 May 2009 17:55:01 +0200
Subject: try except inside exec
In-Reply-To: <0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>
References: <gvor0g$679$1@nnrp-beta.newsland.it>
	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>
Message-ID: <gvp0gn$9qh$1@nnrp-beta.newsland.it>

Aaron Brady wrote:
> STR = """
> class Globals:
>    err = 0
> def a_funct():
>    try:
>       1/0
>    except ZeroDivisionError:
>       import traceback
>       Globals.err = traceback.format_exc()
> """


> exec STR in env
> try:
>   env["a_funct"]()
> except ZeroDivisionError:
>   import traceback
>   err = traceback.format_exc()
> 
> Then the formatted exception will be available in 'err'.  Do you want
> the exception-handling to be part of the function you are entering
> into 'env'?

My goal is to execute a function received from a third-part, so I cannot 
modify as you made in your first piece of code.
I want a "clean" exception with the real line code/tb so I can show a 
"real" error message. This means that the try/execpt has to include the 
passed function and catch every possible exception.

Do you have any ideas on how can I figure this out?

Thanks,
Michele


From cfbolz at gmx.de  Fri May 29 12:07:28 2009
From: cfbolz at gmx.de (Carl Friedrich Bolz)
Date: Fri, 29 May 2009 18:07:28 +0200
Subject: PyPy Europython Sprint Announcement
Message-ID: <gvp180$n1c$1@ger.gmane.org>

==================================================================
Birmingham (UK) EuroPython PyPy Sprints 28-29 June/ 3-4 July 2009
==================================================================

The PyPy team is sprinting at EuroPython again. This year there are
`sprint days`_ before (28-29 June) and after (3-4 July) the conference.
Some PyPy core people should be present during both periods.

.. _`sprint days`: http://wiki.europython.eu/Sprints

If you plan to attend the sprints after the conference we recommend you
to listen to the PyPy technical talk (`EuroPython schedule`_) during the
conference since it will give you a good overview of the status of
development.

Goals and topics of the sprint
------------------------------

There are many possible and interesting sprint topics to work on - here
we list some possible task areas:

  - trying out software on PyPy's Python interpreter: the CPython test
    suite is not all that complete, therefore the fact that we pass most
    tests is no real indication of bug-freeness. We have tried and know
    that frameworks like Django and Twisted work with PyPy. Therefore we
    would like to try running more "real applications" on top of the
    Python interpreter (ideally ones that have a good test suite
    themselves and that don't need unusual extension modules). Running
    things on Windows is also interesting, we know our coverage there is
    not as good as on Linux.

  - check and improve Mac OS X support

  - starting to work on porting 2.6 features to PyPy's Python interpreter

  - ongoing JIT generator work

  - of course we are open to other ideas for what to work on. Examples
    could be working on other language interpreters, sandboxing, ...


------------
Registration
------------

If you'd like to come, please subscribe to the `pypy-sprint mailing
list`_ and drop a note about your interests and post any questions.
More organisational information will be sent to that list.

Please register by adding yourself on the following list (via svn):

   http://codespeak.net/svn/pypy/extradoc/sprintinfo/ep2009/people.txt

or on the pypy-sprint mailing list if you do not yet have check-in
rights:

   http://codespeak.net/mailman/listinfo/pypy-sprint

---------------------------------------
Preparation (if you feel it is needed):
---------------------------------------

- read the `getting-started`_ pages on http://codespeak.net/pypy,
   especially also the `development of PyPy itself part`_ .

- for inspiration, overview and technical status you are welcome to read
   `the technical reports available and other relevant documentation`_

- please direct any technical and/or development oriented questions to
   pypy-dev at codespeak.net and any sprint organizing/logistical
   questions to pypy-sprint at codespeak.net

- if you need information about the conference, potential hotels,
   directions etc we recommend to look at http://www.europython.eu.


We are looking forward to meet you at the EuroPython PyPy sprints!

The PyPy team


.. See also ..

.. _getting-started:
http://codespeak.net/pypy/dist/pypy/doc/getting-started.html
.. _`development of PyPy itself part`:
http://codespeak.net/pypy/dist/pypy/doc/getting-started-dev.html

.. _`pypy-sprint mailing list`:
http://codespeak.net/mailman/listinfo/pypy-sprint
.. _`the technical reports available and other relevant documentation`:
http://codespeak.net/pypy/dist/pypy/doc/docindex.html

.. _`EuroPython schedule`: http://europython.eu/talks/timetable





From ifl2009 at shu.edu  Fri May 29 12:23:59 2009
From: ifl2009 at shu.edu (IFL 2009)
Date: Fri, 29 May 2009 12:23:59 -0400
Subject: IFL 2009: Second Call for Papers
Message-ID: <OFE617316A.0B48F237-ON852575C5.0059868B-852575C5.005A16A2@shu.edu>

Call for Papers 
IFL 2009
Seton Hall University
SOUTH ORANGE, NJ, USA
http://tltc.shu.edu/blogs/projects/IFL2009/


** NEW **

Accomodations information available: 
http://tltc.shu.edu/blogs/projects/IFL2009/accommodations.html

Jane Street Capital has joined IFL 2009 as a sponsor

*********


The 21st International Symposium on Implementation and Application of 
Functional Languages, IFL 2009, will be held 
for the first time in the USA. The hosting institution is Seton Hall 
University in South Orange, NJ, USA and the 
symposium dates are September 23-25, 2009. It is our goal to make IFL a 
regular event held in the USA and in 
Europe. The goal of the IFL symposia is to bring together researchers 
actively engaged in the implementation and 
application of functional and function-based programming languages. IFL 
2009 will be a venue for researchers to 
present and discuss new ideas and concepts, work in progress, and 
publication-ripe results related to the 
implementation and application of functional languages and function-based 
programming.

Following the IFL tradition, IFL 2009 will use a post-symposium review 
process to produce a formal proceedings which 
will be published by Springer in the Lecture Notes in Computer Science 
series. All participants in IFL 2009 are 
invited to submit either a draft paper or an extended abstract describing 
work to be presented at the symposium. 
These submissions will be screened by the program committee chair to make 
sure they are within the scope of IFL and will 
appear in the draft proceedings distributed at the symposium. Submissions 
appearing in the draft proceedings are not 
peer-reviewed publications. After the symposium, authors will be given the 
opportunity to incorporate the feedback from 
discussions at the symposium and will be invited to submit a revised full 
arcticle for the formal review process. These 
revised submissions will be reviewed by the program committee using 
prevailing academic standards to select the best 
articles that will appear in the formal proceedings.


TOPICS

IFL welcomes submissions describing practical and theoretical work as well 
as submissions describing applications and tools. 
If you are not sure if your work is appropriate for IFL 2009, please 
contact the PC chair at ifl2009 at shu.edu. Topics of 
interest include, but are not limited to:

 language concepts 
 type checking 
 contracts
 compilation techniques 
 staged compilation
 runtime function specialization
 runtime code generation 
 partial evaluation 
 (abstract) interpretation 
 generic programming techniques 
 automatic program generation 
 array processing 
 concurrent/parallel programming 
 concurrent/parallel program execution 
 functional programming and embedded systems 
 functional programming and web applications 
 functional programming and security 
 novel memory management techniques 
 runtime profiling and performance measurements 
 debugging and tracing 
 virtual/abstract machine architectures 
 validation and verification of functional programs 
 tools and programming techniques 
 FP in Education


PAPER SUBMISSIONS

Prospective authors are encouraged to submit papers or extended abstracts 
to be published in the draft proceedings and to 
present them at the symposium. All contributions must be written in 
English, conform to the Springer-Verlag LNCS series 
format and not exceed 16 pages. The draft proceedings will appear as a 
technical report of the Department of Mathematics 
and Computer Science of Seton Hall University.


IMPORTANT DATES

Registration deadline                   August 15, 2009
Presentation submission deadline        August 15, 2009
IFL 2009 Symposium                      September 23-25, 2009
Submission for review process deadline  November 1, 2009
Notification Accept/Reject              December 22, 2009
Camera ready version                    February 1, 2010


PROGRAM COMMITTEE

Peter Achten                       University of Nijmegen, The Netherlands
Jost Berthold                       Philipps-Universit?t Marburg, Germany
Andrew Butterfield             University of Dublin, Ireland
Robby Findler                     Northwestern University, USA
Kathleen Fisher                   AT&T Research, USA
Cormac Flanagan              University of California at Santa Cruz, USA
Matthew Flatt                        University of Utah, USA
Matthew Fluet                       Toyota Technological Institute at 
Chicago, USA
Daniel Friedman                 Indiana University, USA
Andy Gill                                University of Kansas, USA
Clemens Grelck                  University of Amsterdam/Hertfordshire, The 
Netherlands/UK
Jurriaan Hage                      Utrecht University, The Netherlands
Ralf Hinze                              Oxford University, UK
Paul Hudak                           Yale University, USA
John Hughes                        Chalmers University of Technology, 
Sweden
Patricia Johann                    University of Strathclyde, UK
Yukiyoshi Kameyama        University of Tsukuba, Japan
Marco T. Moraz?n (Chair)  Seton Hall University, USA
Rex Page                                University of Oklahoma, USA
Fernando Rubio                    Universidad Complutense de Madrid, Spain
Sven-Bodo Scholz               University of Hertfordshire, UK
Manuel Serrano                     INRIA Sophia-Antipolis, France
Chung-chieh Shan                Rutgers University, USA
David Walker                         Princeton University, USA
Vikt?ria Zs?k                          E?tv?s Lor?nd University, Hungary


PETER LANDIN PRIZE

The Peter Landin Prize is awarded to the best paper presented at the 
symposium every year. The honored article is selected 
by the program committee based on the submissions received for the formal 
review process. The prize carries a cash award 
equivalent to 150 euros.
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From emile at fenx.com  Fri May 29 12:47:54 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 29 May 2009 09:47:54 -0700
Subject: try except inside exec
In-Reply-To: <gvp0gn$9qh$1@nnrp-beta.newsland.it>
References: <gvor0g$679$1@nnrp-beta.newsland.it>	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>
	<gvp0gn$9qh$1@nnrp-beta.newsland.it>
Message-ID: <gvp3ns$v9t$1@ger.gmane.org>

On 5/29/2009 8:55 AM Michele Petrazzo said...
> Aaron Brady wrote:
<snip>
>> Then the formatted exception will be available in 'err'.  Do you want
>> the exception-handling to be part of the function you are entering
>> into 'env'?
> 
> My goal is to execute a function received from a third-part, so I cannot 
> modify as you made in your first piece of code.
> I want a "clean" exception with the real line code/tb so I can show a 
> "real" error message. This means that the try/execpt has to include the 
> passed function and catch every possible exception.
> 
> Do you have any ideas on how can I figure this out?

Write the string out to a .py file and import it?

Emile



From python-url at phaseit.net  Fri May 29 12:52:15 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Fri, 29 May 2009 16:52:15 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (May 29)
Message-ID: <gvp3rv$l08$1@lairds.us>

QOTW:  "Death To Wildcard Imports" - Lawrence D'Oliveiro
    http://groups.google.com/group/comp.lang.python/msg/835cf7f35ed f4897
    
    
    How to ask questions having a chance of being answered:
        http://groups.google.com/group/comp.lang.python/t/17b15282d07770d1/
    
    Multiprocessing and memory usage:
        http://groups.google.com/group/comp.lang.python/t/4c9c5805aadd833d/
    
    Of backslashes and raw string literals:
        http://groups.google.com/group/comp.lang.python/t/dd18130f9f379974/
    
    How does OOP "feel" in Python?
        http://groups.google.com/group/comp.lang.python/t/2cf2e3c9c1df4e8b/
    
    Sockets: how to reuse the same port quickly
        http://groups.google.com/group/comp.lang.python/t/82204fb9d10d38aa/
    
    Tools to optmize math functions:
        http://groups.google.com/group/comp.lang.python/t/2b34fd6c43be79d6/
    
    Replacing module with a stub for unit testing:
        http://groups.google.com/group/comp.lang.python/t/023dff1ec533f101/
    
    Sometimes it's better to use delegation instead of inheritance:
        http://groups.google.com/group/comp.lang.python/t/86674e06fc14c6a6/
    
    Inserting NULL values in a database:
        http://groups.google.com/group/comp.lang.python/t/3c3ccdbfe1bc5a45/
    
    
========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiasts":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.
	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    Enjoy the *Python Magazine*.
	http://pymag.phparch.com/

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
  http://search.gmane.org/?query=python+URL+weekly+news+links&group=gmane.comp.python.general&sort=date
  http://groups.google.com/groups/search?q=Python-URL!+group%3Acomp.lang.python&start=0&scoring=d&
  http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes

There is *not* an RSS for "Python-URL!"--at least not yet.  Arguments
for and against are occasionally entertained.


Suggestions/corrections for next week's posting are always welcome.
E-mail to <Python-URL at phaseit.net> should get through.

To receive a new issue of this posting in e-mail each Monday morning
(approximately), ask <claird at phaseit.net> to subscribe.  Mention
"Python-URL!".  Write to the same address to unsubscribe.


-- The Python-URL! Team--

Phaseit, Inc. (http://phaseit.net) is pleased to participate in and
sponsor the "Python-URL!" project.  Watch this space for upcoming
news about posting archives.


From garrickp at gmail.com  Fri May 29 13:06:48 2009
From: garrickp at gmail.com (Falcolas)
Date: Fri, 29 May 2009 10:06:48 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <mailman.873.1243580240.8015.python-list@python.org> 
	<003b70c0$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <329585b8-1761-4b41-9682-a1fe61c0af31@x3g2000yqa.googlegroups.com>

I am a long time VIM user, and I likely will not change that. The
speed, ease of use and functionality, for me, is worth the time spent
learning how to use it.

My secondary editor on the desktop is UltraEdit, which does a fine job
as a text editor and has all the same functionality of VIM - yet
despite 2 years on it (they won't allow me GVIM at work), I can't get
to the same level of productivity with it as I can with VIM.

Ditto Eclipse... I spent more time figuring out how to get a program
to run properly than coding. The limited autocomplete and function
jump-list were not worth the pain of getting it working, IMO.

On May 29, 2:01 am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:

> (1) Closed source editors have the same functional requirements as open
> source editors.
>
> (2) If you're waiting for perfection, you'll be waiting forever.
>
> (3) Why independent of the OS? When is the last time you've used a system
> without an OS? Forth programmers in the 1970s used an editor that was OS
> independent -- it managed files using its own unique file structure,
> managed memory itself, etc. Why do you want to go back there?

As to your points, Steven:

1) I would agree with this point. VI and it's children were written to
a different interpretation of said rules, however. They were built
around the speed at which a human can use a keyboard with natural
finger movements, at the expense of discoverability and intuitiveness.
2) VIM may not be perfect, but it's really darned close. ;-)
3) OS independence, IMO, is related more to the ability to use the
tool on every OS, rather than on the lack of an OS.


From dstanek at dstanek.com  Fri May 29 13:07:44 2009
From: dstanek at dstanek.com (David Stanek)
Date: Fri, 29 May 2009 13:07:44 -0400
Subject: try except inside exec
In-Reply-To: <gvp0gn$9qh$1@nnrp-beta.newsland.it>
References: <gvor0g$679$1@nnrp-beta.newsland.it>
	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>
	<gvp0gn$9qh$1@nnrp-beta.newsland.it>
Message-ID: <de32cc030905291007s6a8d64f8k16707c49bd1679e8@mail.gmail.com>

On Fri, May 29, 2009 at 11:55 AM, Michele Petrazzo
<michele.petrazzo at remove_me_unipex.it> wrote:
>
> My goal is to execute a function received from a third-part, so I cannot
> modify as you made in your first piece of code.
> I want a "clean" exception with the real line code/tb so I can show a "real"
> error message. This means that the try/execpt has to include the passed
> function and catch every possible exception.
>
> Do you have any ideas on how can I figure this out?
>

Is the thirdparty function the entire STR or just the a_funct part?

-- 
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek


From iainemsley at googlemail.com  Fri May 29 13:09:10 2009
From: iainemsley at googlemail.com (iainemsley)
Date: Fri, 29 May 2009 10:09:10 -0700 (PDT)
Subject: Trying to get cleaner XML output from a text file
Message-ID: <cf161cdb-a623-496a-af42-bb4d06ae74cb@s16g2000vbp.googlegroups.com>

I'm using Python2.5 to try and convert some text files into XML using
xml.minidom. I'm currently doing some plays which have a structure
like
Scene 1
Act 1
blah blah
Act2
blah blah
Scene 2
Act 1
and so on.
I'm trying to turn it into
<div type="scene">1
  <div type="act">1
   <speech />
  </div>
  <div type="act">2
   <speech />
  </div>
</div>
(or ideally <div type="scene" id="1"> bit I can always come back to
this later)
I've currently got:
 <div id="" type="scene">
  <div id=" " type="act">
   <speech>
    II
   </speech>
  </div>
 </div>
 <div id="" type="scene">
  <div id=" " type="act">
   <speech>
    II
   </speech>
  </div>
 </div>
 <div id="" type="scene">
  <div id=" " type="act">
The code I'm currently working with is:
from itertools import groupby
from xml.dom.minidom import Document

import re

text = open('\\texts\\midsummer_nights_dream_gut.txt').read()

def paragraphs(lines, is_separator=str.isspace, joiner=''.join):
    for separator_group, lineiter in groupby(lines, key=is_separator):
        if not separator_group:
            yield joiner(lineiter)

def scene_node(scene):
    global docText
    docText = doc.createElement("div")
    #need to set the type to book, verse, drama
    docText.setAttribute("type", "scene")
    #need set the id to what ever break name or id: i.e. chapter 1 or
act 1
    docText.setAttribute("id", '')
    tei.appendChild(docText)
    for acts in actTxt.split(scene):
        act_node(acts)

def act_node(act):
    global actText
    actText = doc.createElement("div")
    #need to set the type to book, verse, drama
    actText.setAttribute("type", "act")
    #need set the id to what ever id: 1 or I
    actText.setAttribute("id", ' ')
    docText.appendChild(actText)
    for p in paragraphs(act.splitlines(True)):
        speech_node(p)

def speech_node(speech):
        para = doc.createElement("speech")
        actText.appendChild(para)
        ptext = doc.createTextNode(speech)
        para.appendChild(ptext)


doc = Document()
tei = doc.createElement("body")
doc.appendChild(tei)

sideTxt = re.compile(r"Scene\s+([1-9])", re.I)
actTxt = re.compile(r"Act\s+([1-9])", re.I)
for textStr in sideTxt.split(text):
    scene_node(textStr)

print doc.toprettyxml(indent = " ")
I'd be grateful for some pointers about getting a cleaner output.

Thanks,

Iain


From piet at cs.uu.nl  Fri May 29 13:44:12 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 29 May 2009 19:44:12 +0200
Subject: Parsing DTDs
References: <alpine.DEB.1.10.0905291352130.14054@urchin.earth.li>
Message-ID: <m2eiu7g5xv.fsf@cs.uu.nl>

>>>>> Tom Anderson <twic at urchin.earth.li> (TA) wrote:

>TA> Hello!
>TA> I would like to parse XML DTDs. The goal is to be able to validate XML-like
>TA> object structures against DTDs in a fairly flexible way, although i can get
>TA> from a parsed DTD to a validation engine myself, so that's not an essential
>TA> feature of the parser (although it would be nice!). What should i do?

>TA> A bit of googling revealed that the xmlproc package contains a DTD parser
>TA> that looks like it does just what i want, and that xmlproc became PyXML,
>TA> and that PyXML is no longer maintained.

>TA> Is there a DTD parser that is being maintained? Or does it not really
>TA> matter that PyXML is no longer maintained, given that it's not like the DTD
>TA> spec has changed very much?

http://codespeak.net/lxml/validation.html#dtd
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From castironpi at gmail.com  Fri May 29 14:25:13 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 29 May 2009 11:25:13 -0700 (PDT)
Subject: try except inside exec
References: <gvor0g$679$1@nnrp-beta.newsland.it>
	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>
	<gvp0gn$9qh$1@nnrp-beta.newsland.it>
Message-ID: <f8fa5a89-9b49-4e1f-a4e4-c369ba6c71ae@s31g2000vbp.googlegroups.com>

On May 29, 9:55?am, Michele Petrazzo
<michele.petrazzo at REMOVE_me_unipex.it> wrote:
> Aaron Brady wrote:
> > STR = """
> > class Globals:
> > ? ?err = 0
> > def a_funct():
> > ? ?try:
> > ? ? ? 1/0
> > ? ?except ZeroDivisionError:
> > ? ? ? import traceback
> > ? ? ? Globals.err = traceback.format_exc()
> > """
> > exec STR in env
> > try:
> > ? env["a_funct"]()
> > except ZeroDivisionError:
> > ? import traceback
> > ? err = traceback.format_exc()
>
> > Then the formatted exception will be available in 'err'. ?Do you want
> > the exception-handling to be part of the function you are entering
> > into 'env'?
>
> My goal is to execute a function received from a third-part, so I cannot
> modify as you made in your first piece of code.
> I want a "clean" exception with the real line code/tb so I can show a
> "real" error message. This means that the try/execpt has to include the
> passed function and catch every possible exception.
>
> Do you have any ideas on how can I figure this out?
>
> Thanks,
> Michele

Exceptions are only caught when raised in a 'try' statement.  If you
don't raise the exception in a try statement, it won't be caught.

The function you posted will raise an exception.  If you are making
the call yourself, that is, if only the definition is foreign, then
simply catch exceptions when so.

Otherwise, my only idea so far is to use the 'ast' module to inject an
exception handler into the third-party function.  That is quite
advanced and may be error-prone, though I think it would look
something like this:

for every 'def' statement in STR:
   def_statement.body= try_statement + def_statement.body

I expect it would be more reliable than hand-parsing the text and
concatenating a string exception statement.

Any interest in this, or do you make the call yourself?


From Jared.S.Bauer at gmail.com  Fri May 29 14:26:07 2009
From: Jared.S.Bauer at gmail.com (Jared.S.Bauer at gmail.com)
Date: Fri, 29 May 2009 11:26:07 -0700 (PDT)
Subject: Questions about regex
Message-ID: <fe9f707f-aaf3-4ca6-859a-5b0c63904fc0@s28g2000vbp.googlegroups.com>

Hello,

I'm new to python and I'm having problems with a regular expression. I
use textmate as my editor and when I run the regex in textmate it
works fine, but when I run it as part of the script it freezes. Could
anyone help me figure out why this is happening and how to fix it.
Here is the script:


======================================================
# regular expression search and replace
import sys, os, re, string, csv

#Open the file and taking its data
myfile=open('Steve_query3.csv') #Steve_query_test.csv
#create an error flag  to loop the script twice
#store all file's data in the string object 'text'
myfile.seek(0)
text = myfile.read()

for i in range(2):
	#def textParse(text, reRun):
	print 'how many times is this getting executed', i

	#Now to create the newfile 'test' and write our 'text'
	newfile = open('Steve_query3_out.csv', 'w')
	#open the new file and set it with 'w' for "write"
	#loop trough 'text' clean them up and write them into the 'newfile'
			#sub(  	pattern, repl, string[, count])
			#"sub("(?i)b+", "x", "bbbb BBBB")" returns 'x x'.
	text = re.sub('(\<(/?[^\>]+)\>)', "", text)#remove the HTML
	text = re.sub('/<!--(.|\s)*?-->/', "", text) #remove comments  <!--[^
\-]+-->
	text = re.sub('\/\*(.|\s)*?;}', "", text) #remove css formatting
	#remove a bunch of word formatting yuck
	text = re.sub("&nbsp;", " ", text)
	text = re.sub("&lt;", "<", text)
	text = re.sub("&gt;", ">", text)
	text = re.sub("&quot;|&rquot;|&ldquo;", "\'", text)
#===================================
#The two following lines are the ones giving me the problems
	text = re.sub("w:(.|\s)*?\n", "", text)
	text = re.sub("UnhideWhenUsed=(.|\s)*?\n", "", text)
#===========================================
	text = re.sub(re.compile('^\r?\n?$', re.MULTILINE), '', text) #remove
the extra whitespace
	#now write out the new file and close it
	newfile.write(text)
	newfile.close()

	#open the newfile and run the script again
	#Open the file and taking its data

	myfile=open('Steve_query3_out.csv') #Steve_query_test.csv
	#store all file's data in the string object 'text'
	myfile.seek(0)
	text = myfile.read()

Thanks for the help,

-Jared


From tjreedy at udel.edu  Fri May 29 14:29:46 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 29 May 2009 14:29:46 -0400
Subject: python list pattern matching?
In-Reply-To: <gvnvme$p5f$00$2@news.t-online.com>
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>	<mailman.859.1243551475.8015.python-list@python.org>
	<gvnvme$p5f$00$2@news.t-online.com>
Message-ID: <gvp9ip$gb9$1@ger.gmane.org>

Peter Otten wrote:
> Terry Reedy wrote:
> 
>>  >>> a,b,*rest = list(range(10))
> 
> The list() call is superfluous.

Agreed, even in Py3 when range() returns a range object rather than a list.



From namekuseijin at gmail.com  Fri May 29 14:32:15 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 29 May 2009 15:32:15 -0300
Subject: Programming Praxis
In-Reply-To: <c1bcecd0-6dab-4fef-aad2-5f1b88708034@z19g2000vbz.googlegroups.com>
References: <c1bcecd0-6dab-4fef-aad2-5f1b88708034@z19g2000vbz.googlegroups.com>
Message-ID: <gvp9nf$2h2u$2@adenine.netfront.net>

Phil Bewig escreveu:
> Please visit my blog, Programming Praxis, which presents a collection
> of programming etudes.  Newbies will find exercises that extend their
> programming abilities.  Savvy programmers can use the exercises to
> sharpen their skills or learn a new language.  Brave programmers can
> submit their code to the review of their colleagues.
> 
> Programming Praxis isn't a contest.  No points are awarded, no scores
> are kept.  The exercises simply provide an opportunity to hone your
> skills; the effort is its own reward.
> 
> Programming Praxis is available on the web at http://programmingpraxis.wordpress.com.
> Come join us!

It's very good, yes. :)

-- 
a game sig: http://tinyurl.com/d3rxz9


From chrisv at nospam.invalid  Fri May 29 15:11:17 2009
From: chrisv at nospam.invalid (chrisv)
Date: Fri, 29 May 2009 14:11:17 -0500
Subject: DrPython (Windows) problems
Message-ID: <5ob025pmkjfk1pdfbhh2fsaeekceof32hk@4ax.com>


Running DrPython under Linux works great.  However, when I run it
under Windows:

1)  I need to "Open" programs twice.  That's right, File, Open, and
select the program.  First time, nothing.  Repeat, and there's the
program!

2)  Run I run a program, the "execution box" comes-up and shows the
program output, but it never goes-away.  I cannot figure-out how to
close this window.



From cameron.pulsford at gmail.com  Fri May 29 15:13:46 2009
From: cameron.pulsford at gmail.com (Cameron Pulsford)
Date: Fri, 29 May 2009 15:13:46 -0400
Subject: NameError function not found
Message-ID: <5700df6b0905291213y4ee08697xb336797adeb468a2@mail.gmail.com>

Hey everyone, I am extremely stumped on this. I have 2 functions..

def _determinant(m):
   return m[0][0] * m[1][1] - m[1][0] * m[0][1]

def cofactor(self):
   """Returns the cofactor of a matrix."""
   newmatrix = []
   for i, minor in enumerate(self.minors()):
       newmatrix.append(_determinant(minor.matrix) * ((i%2) * -1))
   return newmatrix

And I get the following error when I try to run a.cofactor()...

"NameError: global name '_determinant' is not defined"

When I put the _determinant function nested within the cofactor function it
works fine. Normally I would do this, but a lot of other methods use the
_determinant method. They are both in the same class, and they are at the
same level, they are even in that order so I know it should be  able to see
it. I have a lot of functions that call other functions in this class and
everything is fine. [Also for the picky, I know my cofactor method isn't
mathematically correct yet ;-) ] Am I missing something obvious here? Also
if it helps the rest of the code is here
http://github.com/dlocpuwons/pymath/blob/d1997329e4473f8f6b5c7f11635dbd719d4a14fa/matrix.py
though
it is not the latest.
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From roastie57 at gmail.com  Fri May 29 15:14:37 2009
From: roastie57 at gmail.com (Roastie)
Date: Fri, 29 May 2009 12:14:37 -0700 (PDT)
Subject: PyOpenGL Installation
Message-ID: <d76a72b7-3196-4fef-86b7-473c827dcfba@s16g2000vbp.googlegroups.com>

The web info I have found for downloading/installing PyOpenGL and
its dependencies for Windows is a nightmare.  Is there a place where
all of
the endless dependencies are packaged nicely with PyOpenGL?


From tack at urandom.ca  Fri May 29 16:07:12 2009
From: tack at urandom.ca (Jason Tackaberry)
Date: Fri, 29 May 2009 16:07:12 -0400
Subject: NameError function not found
In-Reply-To: <5700df6b0905291213y4ee08697xb336797adeb468a2@mail.gmail.com>
References: <5700df6b0905291213y4ee08697xb336797adeb468a2@mail.gmail.com>
Message-ID: <1243627632.3568.346.camel@arrakis>

On Fri, 2009-05-29 at 15:13 -0400, Cameron Pulsford wrote:
> def _determinant(m):
>    return m[0][0] * m[1][1] - m[1][0] * m[0][1]

Given that this has no self argument, I'm assuming this is not a class
method.


> def cofactor(self):
>    """Returns the cofactor of a matrix."""

Given that this does, I assume this _is_ a class method.

So are you putting _determinant() inside the class?  If so, you should
either make it method, and invoke it as self._determinant(), or bring it
outside the class into the global scope, in which case your code should
work.

Cheers,
Jason.



From lkennedy5 at gmail.com  Fri May 29 16:34:37 2009
From: lkennedy5 at gmail.com (lkennedy5 at gmail.com)
Date: Fri, 29 May 2009 13:34:37 -0700 (PDT)
Subject: CRLF when doing os.system("ls -l") while using curses !!!
Message-ID: <dc9db609-f79c-4bd6-8777-7743e6628a68@z19g2000vbz.googlegroups.com>

Here is the code and as you can see for yourself, the output is not
coming out on the screen with CRLF like it should.  How do I fix this?



import curses, os
screen = curses.initscr()
os.system("ls -l")
curses.endwin()


From rafalskiy at gmail.com  Fri May 29 16:43:45 2009
From: rafalskiy at gmail.com (s4g)
Date: Fri, 29 May 2009 13:43:45 -0700 (PDT)
Subject: Replacing module with a stub for unit testing
References: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>
	<mailman.655.1243167260.8015.python-list@python.org>
	<02293ea4$0$21844$c3e8da3@news.astraweb.com>
Message-ID: <f35189e8-67bf-4bd3-a15e-28f5032885b0@e24g2000vbe.googlegroups.com>

Try

import sys
import ExpensiveModuleStub

sys.modules['ExpensiveModule'] = ExpensiveModuleStub
sys.modules['ExpensiveModule'].__name__ = 'ExpensiveModule'

Should do the trick


------
Vyacheslav


From emile at fenx.com  Fri May 29 16:56:06 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 29 May 2009 13:56:06 -0700
Subject: CRLF when doing os.system("ls -l") while using curses !!!
In-Reply-To: <dc9db609-f79c-4bd6-8777-7743e6628a68@z19g2000vbz.googlegroups.com>
References: <dc9db609-f79c-4bd6-8777-7743e6628a68@z19g2000vbz.googlegroups.com>
Message-ID: <gvpi97$aqg$1@ger.gmane.org>

On 5/29/2009 1:34 PM lkennedy5 at gmail.com said...
> Here is the code and as you can see for yourself, the output is not
> coming out on the screen with CRLF like it should. 

Mine did:

[root at falcon]# python2
Python 2.3.3 (#1, May 11 2004, 14:44:08)
[GCC 2.96 20000731 (Red Hat Linux 7.1 2.96-85)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import curses, os
 >>> screen = curses.initscr()
 >>> os.system("ls -l")
total 8
drwxr-xr-x    4 root     root         4096 Apr 28 14:42 fal
drwxr-xr-x    4 root     root         4096 Apr 28 14:43 home


> How do I fix this?

Provide details on your environment so others can duplicate the error.

Emile

> 
> 
> 
> import curses, os
> screen = curses.initscr()
> os.system("ls -l")
> curses.endwin()



From barry at python.org  Fri May 29 17:10:43 2009
From: barry at python.org (Barry Warsaw)
Date: Fri, 29 May 2009 17:10:43 -0400
Subject: [Python-mode] What text editor is everyone using for Python
In-Reply-To: <4A1E70DE.4080407@online.de>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<gvg5d7$382$2@lust.ihug.co.nz>	<mailman.741.1243325683.8015.python-list@python.org>	<roy-92C5E8.09222926052009@news.panix.com>	<mailman.782.1243385070.8015.python-list@python.org>	<4a1d628f$0$6471$426a74cc@news.free.fr>
	<op.uul09plha8ncjz@gnudebst> <4A1E70DE.4080407@online.de>
Message-ID: <B5BDBD32-3671-4171-ABEE-B87CC511D2F6@python.org>

On May 28, 2009, at 7:09 AM, Andreas Roehler wrote:

>> python-mode.el was its bloody-minded determination to regard '_' as  
>> a word
>> character, something which caused me more typing that it ever saved.
>>
>
> Its just one line to comment in python-mode.el, like this:
>
>  ;; (modify-syntax-entry ?\_ "w"  py-mode-syntax-table)

This one is ancient and I remember that Guido and I talked about this  
for a long time before settling on the behavior.

-Barry

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From pavlovevidence at gmail.com  Fri May 29 17:58:03 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 29 May 2009 14:58:03 -0700 (PDT)
Subject: try except inside exec
References: <gvor0g$679$1@nnrp-beta.newsland.it>
Message-ID: <980232fd-a19a-4444-8988-49a13f3e291b@h18g2000yqj.googlegroups.com>

On May 29, 7:21?am, Michele Petrazzo
<michele.petrazzo at REMOVE_me_unipex.it> wrote:
> Hi all,
> I want to execute a python code inside a string and so I use the exec
> statement. The strange thing is that the try/except couple don't catch
> the exception and so it return to the main code.
> Is there a solution to convert or make this code work?
>
> Thanks,
> Michele
>
> My code:
>
> STR = """
> err = 0
> try:
> ? ?def a_funct():
> ? ? ?1/0
> except:
> ? ?import traceback
> ? ?err = traceback.format_exc()
> """
>
> env = {}
> exec STR in env
> env["a_funct"]()
> print env["err"]
>
> My error:
> ? ?File "tmp/test_exec.py", line 14, in <module>
> ? ? ?env["a_funct"]()
> ? ?File "<string>", line 5, in a_funct
> ZeroDivisionError: integer division or modulo by zero



From beau at open-source-staffing.com  Fri May 29 18:10:30 2009
From: beau at open-source-staffing.com (OSS)
Date: Fri, 29 May 2009 15:10:30 -0700 (PDT)
Subject: [JOB] Plone Developer, Washington, D.C. - Relo OK | 55-75k
Message-ID: <0561a67f-f6f2-4458-9574-10095272cfb2@s21g2000vbb.googlegroups.com>

Plone Developer, Washington, D.C. - Relo OK | 55-75k

shiverat** Government security clearance required **
** Relocation assistance provided **

My client is seeking a full-time Plone Developer for work with the
federal government. The applicant will be responsible for
standardizing web formats already in place, ensuring 508 compliance,
and deploying content and making both routine and complex changes to
the website. In addition, the applicant should have expertise in
developing web architectures capable of facilitating complex technical
updates as well as managing voluminous materials. The applicant must
have substantial experience with developing or enhancing websites in a
Web 2.0 environment. Government security clearance required.

Required Skills:
* High level skills creating and managing application servers
* High level skills in the Plone base programming language Python,
CPython, and C
* Expert skills building Plone content management systems; preferably
with government experience

Nice to have skills: JavaScript, CSS, HTML, XML, XHTML, Flash,
Dreamweaver

To be considered, please submit your resume along with your salary
requirements to beau at open-source-staffing.com

Thank you,

Beau J. Gould
Open Source Staffing
www.open-source-staffing.com
beau at open-source-staffing.com

http://groups.yahoo.com/group/pythonzopejobs


From pavlovevidence at gmail.com  Fri May 29 18:20:00 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 29 May 2009 15:20:00 -0700 (PDT)
Subject: try except inside exec
References: <gvor0g$679$1@nnrp-beta.newsland.it>
Message-ID: <8393f3bc-a403-4ca6-bdc1-5cb90fa9f667@h11g2000yqb.googlegroups.com>

On May 29, 7:21?am, Michele Petrazzo
<michele.petrazzo at REMOVE_me_unipex.it> wrote:
> Hi all,
> I want to execute a python code inside a string and so I use the exec
> statement. The strange thing is that the try/except couple don't catch
> the exception and so it return to the main code.
> Is there a solution to convert or make this code work?
>
> Thanks,
> Michele
>
> My code:
>
> STR = """
> err = 0
> try:
> ? ?def a_funct():
> ? ? ?1/0
> except:
> ? ?import traceback
> ? ?err = traceback.format_exc()
> """

The exception isn't being raised because you haven't called the
function.  It's not an exception to define a function that does a
divide by zero, only to execute such a function.


> env = {}
> exec STR in env
> env["a_funct"]()

Here is where you call the function, thus the exception occurs here.


> print env["err"]

This line isn't actually being executed.  I'm not sure if you realize
that....

> My error:
> ? ?File "tmp/test_exec.py", line 14, in <module>
> ? ? ?env["a_funct"]()
> ? ?File "<string>", line 5, in a_funct
> ZeroDivisionError: integer division or modulo by zero

In general you can't know ahead of time what exceptions a function
might raise, so what you are trying to do can't be done.  You have to
handle the exception at the point where it is called.


And from another post:
> My goal is to execute a function received from a third-part,

The only time it's not a gaping security hole to run code supplied by
a thrid-party as-is is if the program is running on the third-party's
own computer.

If you're execing code on your computer that you didn't write or
thoroughly verify yourself--and you're obviously not doing that--then
you might as well just post your password publicly and say, "have at
it evil hackers".


Carl Banks


From piet at cs.uu.nl  Fri May 29 18:35:38 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 30 May 2009 00:35:38 +0200
Subject: CRLF when doing os.system("ls -l") while using curses !!!
References: <dc9db609-f79c-4bd6-8777-7743e6628a68@z19g2000vbz.googlegroups.com>
Message-ID: <m2hbz3edvp.fsf@cs.uu.nl>

>>>>> lkennedy5 at gmail.com (l) wrote:

>l> Here is the code and as you can see for yourself, the output is not
>l> coming out on the screen with CRLF like it should.  How do I fix this?

Don't use curses.

Curses puts the terminal in raw mode (more or less) which doesn't
translate the newline character into CRLF. If you use curses you are
supposed to do all output through curses. But the os.system goes
directly to the screen, outside of curses (because it is another
process).
You could catch the output of ls -l with a PIPE and then write the
output to the curses screen with addstr. But a curses screen has a
limited length, whereas your ls -l output may be larger so then you must
implement some form of scrolling.

>l> import curses, os
>l> screen = curses.initscr()
>l> os.system("ls -l")
>l> curses.endwin()

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From Scott.Daniels at Acm.Org  Fri May 29 18:45:38 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 29 May 2009 15:45:38 -0700
Subject: [JOB] Plone Developer, Washington, D.C. - Relo OK | 55-75k
In-Reply-To: <0561a67f-f6f2-4458-9574-10095272cfb2@s21g2000vbb.googlegroups.com>
References: <0561a67f-f6f2-4458-9574-10095272cfb2@s21g2000vbb.googlegroups.com>
Message-ID: <jLKdnViRY5ms-b3XnZ2dnUVZ_uSdnZ2d@pdx.net>

OSS wrote:
> Plone Developer, Washington, D.C. - Relo OK | 55-75k  ....

You should post this to the Python Jobs board, and not here.
     http://www.python.org/community/jobs/

--Scott David Daniels
Scott.Daniels at Acm.Org


From mk.fraggod at gmail.com  Fri May 29 19:03:07 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sat, 30 May 2009 05:03:07 +0600
Subject: extract to dictionaries
In-Reply-To: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
Message-ID: <20090530050307.7e3ad046@coercion>

On Thu, 28 May 2009 16:03:45 -0700 (PDT)
Marius Retegan <marius.s.retegan at gmail.com> wrote:

> Hello
> I have simple text file that I have to parse. It looks something like
> this:
> 
> parameters1
>      key1 value1
>      key2 value2
> end
> 
> parameters2
>      key1 value1
>      key2 value2
> end
> 
> So I want to create two dictionaries parameters1={key1:value1,
> key2:value2} and the same for parameters2.


You can use iterators to efficiently parse no-matter-how-large file.
Following code depends on line breaks and 'end' statement rather than
indentation.


  import itertools as it, operator as op, functools as ft
  from string import whitespace as spaces

  with open('test.src') as src:
    lines = it.ifilter(bool, it.imap(lambda x: x.strip(spaces), src))
    sections = ( (lines.next(), dict(it.imap(str.split, lines))) for sep,lines in
      it.groupby(lines, key=lambda x: x == 'end') if not sep )
    data = dict(sections)

  print data
  # { 'parameters2': {'key2': 'value2', 'key1': 'value1'},
  #  'parameters1': {'key2': 'value2', 'key1': 'value1'} }



To save namespace and make it a bit more unreadable you can write it
as a one-liner:

  with open('test.src') as src:
    data = dict( (lines.next(), dict(it.imap(str.split, lines))) for sep,lines in
      it.groupby(it.ifilter(bool, it.imap(lambda x: x.strip(spaces), src)),
      key=lambda x: x == 'end') if not sep )


-- 
Mike Kazantsev // fraggod.net
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From martin at v.loewis.de  Fri May 29 19:13:51 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 30 May 2009 01:13:51 +0200
Subject: Problem building 64-bit python 2.6.2 on Solaris 10
In-Reply-To: <d618518b-540c-46f1-aebc-576667da030b@o14g2000vbo.googlegroups.com>
References: <b53cac20-3d5f-4b39-ad2c-daf954ab39d7@s28g2000vbp.googlegroups.com>
	<4a1f0a2c$0$30886$9b622d9e@news.freenet.de>
	<d618518b-540c-46f1-aebc-576667da030b@o14g2000vbo.googlegroups.com>
Message-ID: <4a206c2f$0$13438$9b622d9e@news.freenet.de>

>>> I think the problem is it should be built with v9.S for 64-bit, not
>>> v8.S.  Is that correct?  If so, how do I get it to use the right one?
>> The Solaris dynamic loader can't find it. Set LD_LIBRARY_PATH or
>> LD_RUN_PATH appropriately, or use crle(8).
>>
> I'm not sure I understand.  It appears that cc is compiling the wrong
> module, v8.S.

Ah, too much text - I was confused by you reporting two issues in a
single email message. That has exhausted my capacity for quick message
scanning.

So this is a ctypes problem. You'll have to ignore it - there is
absolutely no way that you could possibly build the ctypes module
with Sun CC (short of rewriting ctypes to support it, of course).
Use gcc if you need the ctypes module, or accept not having the ctypes
module available.

> You may be right about the first error.  It's being reported by ld,
> but -L/opt/openssl/lib/sparcv9 & -R/opt/openssl/lib/sparcv9 are being
> passed to cc.  It is able to find -lssl & -lcrypto, but I think python
> itself doesn't use the openssl libraries.  Since I see the chain
> "ld.so.1: python: fatal: libssl.so.0.9.8: open failed: No such file or
> directory", which I think means python itself doesn't know where they
> are at.  I checked python & libpython.so with ldd & neither uses
> libssl.so.  It seems to me there should be another way to tell python
> where to find it to build the module.  Does this make sense?

Unfortunately, no. It is definitely *not* Python who is searching for
these libraries. That you had been passing them to ld during linkage
doesn't help at all. Linking succeeds just fine; Python then tries
to load the the _ssl module, which in turn causes the *dynamic* linker
(ld.so.1) to search for the shared library; it doesn't find it and
therefore gives up loading _ssl.so.

Regards,
Martin


From celoserpa at gmail.com  Fri May 29 19:21:58 2009
From: celoserpa at gmail.com (Marcelo de Moraes Serpa)
Date: Fri, 29 May 2009 18:21:58 -0500
Subject: [Python-mode] What text editor is everyone using for Python
In-Reply-To: <B5BDBD32-3671-4171-ABEE-B87CC511D2F6@python.org>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
	<4a1d628f$0$6471$426a74cc@news.free.fr> <op.uul09plha8ncjz@gnudebst>
	<4A1E70DE.4080407@online.de>
	<B5BDBD32-3671-4171-ABEE-B87CC511D2F6@python.org>
Message-ID: <1e5bcefd0905291621v389d2f27y5c66e05f293c5089@mail.gmail.com>

stop! Use the editor you are comfortable with. No flame wars please, even
though Emacs is the way to enlightenment :)

On Fri, May 29, 2009 at 4:10 PM, Barry Warsaw <barry at python.org> wrote:

> On May 28, 2009, at 7:09 AM, Andreas Roehler wrote:
>
>  python-mode.el was its bloody-minded determination to regard '_' as a word
>>> character, something which caused me more typing that it ever saved.
>>>
>>>
>> Its just one line to comment in python-mode.el, like this:
>>
>>  ;; (modify-syntax-entry ?\_ "w"  py-mode-syntax-table)
>>
>
> This one is ancient and I remember that Guido and I talked about this for a
> long time before settling on the behavior.
>
> -Barry
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From norseman at hughes.net  Fri May 29 19:48:31 2009
From: norseman at hughes.net (norseman)
Date: Fri, 29 May 2009 16:48:31 -0700
Subject: Python, Tkinter and popen problem
In-Reply-To: <m2d49sck8f.fsf@cs.uu.nl>
References: <mailman.803.1243448972.8015.python-list@python.org>	<gvk2br$6bg$03$1@news.t-online.com>	<mailman.811.1243469678.8015.python-list@python.org>	<gvlnh2$n7t$02$1@news.t-online.com>	<mailman.855.1243537386.8015.python-list@python.org>
	<m2d49sck8f.fsf@cs.uu.nl>
Message-ID: <4A20744F.5090608@hughes.net>

Piet van Oostrum wrote:
>>>>>> norseman <norseman at hughes.net> (n) wrote:
> 
>> n> I have tried both and Popen2.popen2().
>> n> os.popen runs both way, contrary to docs.
> 
> What do you mean `os.popen runs both way'?

It reads from child while console writes directly to child -  thus 
eliminating the problem of coding a pass through from master.

> 
>> n> # master.py
>> n> import os
>> n> #                both lines work same
> 
> Of course, because 'r' is the default, and the bufsize for reading the
> pipe only influences the performance.
> 
>> n> #xx= os.popen("/mnt/mass/py/z6.py").readlines()
>> n> xx= os.popen("/mnt/mass/py/z6.py",'r',1).readlines()
>> n> #                I had hoped small buffer would force a sync (flush())
>> n> #                No such luck.
> 
> First, there is a difference between sync and flush. flush is writing
> out any output that is buffered in the application program for that
> file. Sync is writing out buffers (cache) in the operating system (to the
> disc, network connection or similar). We are talking here about
> flushing, not syncing. As we deal with a pipe, sync is not applicable.
> 
> Furthermore, whatever you do in the master program, such as setting the
> buffer size has nothing to do with what happens in the child, so it will
> not influence the flushing behaviour of the child. The only way to
> influence that would be to use a pty instead of a pipe, because most
> code uses a different buffering strategy for ttys and ptys compared to
> files and pipes.
> 
> The next error in your program is that you use readlines()
> This reads ALL input from your pipe before it proceeds. So essentially
> it waits until the child process is finished and therefore gives you the
> impression that it doesn't flush(). But it is not the child that is the
> problem it is your master.
> 
> What you should do is take the pipe and do a readline()/print loop.
> 
> #xx= os.popen("/mnt/mass/py/z6.py")
> 
> # popen is deprecated. Replace with subprocess:
> from subprocess import Popen, PIPE
> xx = Popen(["/mnt/mass/py/z6.py"], stdout=PIPE).stdout
> 
> while True:
>     line = xx.readline()
>     if not line: break
>     print "\t" + line,
> 
> The obvious:
> 
> for l in xx:
>     print "\t" + l,
> 
> doesn't work as the iterator for a file, including pipes, does a
> read ahead (see the doc on file.next()) and therefore is not suitable for
> interactive use.
> 
>> n> The direct question comes back to:
> 
>> n> How does one force a sync or flush() to take effect in Python with
>> n> Tkinter in use? Or just in Python period. The keyword being force.
> 
> So it should be clear by now that the answer is to use flush().
> And make sure you read AND process the flushed output in a proper way.
> 
> By the way, you have a nasty habit of using very unclear language to
> pose your problems in this newsgroup/mailing list, instead of writing a
> concise description and giving small examples of what code causes the
> problem. This makes it extremely difficult to help you. I had to read
> your messages at least 5 times to get an idea of what you were doing and
> what the problem was that you wanted to solve.
> 
> Maybe you are dyslectic or something similar, in which case I apologize.
> But anyway, I think you should learn to express yourself more clearly.
> There are also courses for that.
===============================

"...
> doesn't work as the iterator for a file, including pipes, does a
> read ahead (see the doc on file.next()) and therefore is not suitable
> for interactive use.
..."

If I understand you the above can be stated as:

The above does not work as an iterator for any file type, including
pipes, but it does do read aheads .... and therefore is not suitable for
interactive use.

If that is correct then read ahead is simply buffered file reads (grab a
chunk, parcel it out on demand) - yes?

As for "... not suitable for interactive ..." Really?  Except for
special purpose use the current interactive components are all buffered
for read ahead use.  Check the actual code for your keyboard, your mouse
and so forth. It's the read ahead that allows faster time to completion.
It's why C-code has the putch function.


Yes - Sync IS the bigger hammer!  If that is what is needed - so be it.
All character readers (byte at a time) should obey a flush(). Depending
on type, code for the reader controls whether or not it flushes
incomplete "lines" in the in-buffer(s). Proper implementation limits 
lost data on system crash.
In trying to use flush at the master side I keep getting messages
indicating strings (completed or not) are not flushable.  Strange 
practice.

---
from subprocess import Popen, PIPE
xx = Popen(["z6.py"], stdout=PIPE).stdout

while True:
     line = xx.readline()
     if not line: break
     print "\t" + line,
---
DOES WORK on Python 2.5.2 on Slackware 10.2 - THANK YOU VERY MUCH!!!
Isn't working on Windows. error message comes as one of two forms.
   1- %1 not found       #as shown above
   2- file not found     #as ...["python z6.py"]...
         same            #as #2 even with full paths given
I get the impression subprocess ignores system things on Windows.
The routines it purposes to replace do use them.  At any rate, 
subprocess is NOT consistent across platforms.

Some questions:
	1) "...], stdout=PIPE).stdout
                    ^            ^  why the double use?
	2) "if not line: break"  what tells what to look for EOL
                                    or is the use of 'line' missleading?
                                    is it a byte at a time output?
                                  how much CPU usage does the loop use?
                                  is there something in that loop that
                                    uses the system pipe triggers to
                                    reduce excessive CPU waste or does it
                                    constantly poll?  If so where does
                                    what code get put to signal (or set)
                                    the courtesy semiphores so it does
                                    not hog the system?


Again - Thank you for something that works.

Steve



From gagsl-py2 at yahoo.com.ar  Fri May 29 20:51:48 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 29 May 2009 21:51:48 -0300
Subject: DrPython (Windows) problems
References: <5ob025pmkjfk1pdfbhh2fsaeekceof32hk@4ax.com>
Message-ID: <op.uupwomjjx6zn5v@gabriel.sleipnir-bsas>

En Fri, 29 May 2009 16:11:17 -0300, chrisv <chrisv at nospam.invalid>  
escribi?:

> Running DrPython under Linux works great.  However, when I run it
> under Windows:

Better to ask questions specific to a certain program, in its specific  
forum/mailing list/whatever.
In this case, try http://drpython.sourceforge.net/help.html

-- 
Gabriel Genellina



From monogeo at gmail.com  Fri May 29 21:09:17 2009
From: monogeo at gmail.com (monogeo)
Date: Fri, 29 May 2009 18:09:17 -0700 (PDT)
Subject: MySQLdb 1.2.2 + python 2.6.2
Message-ID: <e3d11715-765f-459d-9605-f323a1844304@h18g2000yqj.googlegroups.com>

Hi all,

Are MySQLdb 1.2.2 and python 2.6.2 compatible? I went to
http://sourceforge.net/project/showfiles.php?group_id=22307, it
doesn't say it is compatible or not.

When trying to install MySQLdb 1.2.2 on my machine which is running
python 2.6.2 and windows XP, I get this error below.

I am able to install MySQLdb 1.2.2 successfully on another machine
which is running python 2.5.4 and windows XP.

Please help if you have any idea.

C:\temp>easy_install MySQL_python-1.2.2-py2.5-win32.egg
Processing MySQL_python-1.2.2-py2.5-win32.egg
Removing c:\python26\lib\site-packages\MySQL_python-1.2.2-py2.5-
win32.egg
Copying MySQL_python-1.2.2-py2.5-win32.egg to c:\python26\lib\site-
packages
MySQL-python 1.2.2 is already the active version in easy-install.pth

Installed c:\python26\lib\site-packages\mysql_python-1.2.2-py2.5-
win32.egg
Processing dependencies for MySQL-python==1.2.2
Searching for MySQL-python==1.2.2
Reading http://pypi.python.org/simple/MySQL-python/
Reading http://sourceforge.net/projects/mysql-python
Reading http://sourceforge.net/projects/mysql-python/
Best match: MySQL-python 1.2.2
Downloading http://internap.dl.sourceforge.net/sourceforge/mysql-python/MySQL-python-1.2.2.tar.gz
Processing MySQL-python-1.2.2.tar.gz
Running MySQL-python-1.2.2\setup.py -q bdist_egg --dist-dir c:
\docume~1\jchan\locals~1\temp\easy_install-d_b36i\MySQL-
python-1.2.2\egg-dist-tmp-w0_u2d
error: The system cannot find the file specified

Thanks in advance.



From bobby.house at gmail.com  Fri May 29 21:27:32 2009
From: bobby.house at gmail.com (Bobby)
Date: Fri, 29 May 2009 18:27:32 -0700 (PDT)
Subject: Questions about regex
References: <fe9f707f-aaf3-4ca6-859a-5b0c63904fc0@s28g2000vbp.googlegroups.com>
Message-ID: <07fd3b96-e614-42b7-beea-7a82a8f54149@k38g2000yqh.googlegroups.com>

On May 29, 1:26?pm, Jared.S.Ba... at gmail.com wrote:
> Hello,
>
> I'm new to python and I'm having problems with a regular expression. I
> use textmate as my editor and when I run the regex in textmate it
> works fine, but when I run it as part of the script it freezes. Could
> anyone help me figure out why this is happening and how to fix it.
> Here is the script:
>
> ======================================================
> # regular expression search and replace
> import sys, os, re, string, csv
>
> #Open the file and taking its data
> myfile=open('Steve_query3.csv') #Steve_query_test.csv
> #create an error flag ?to loop the script twice
> #store all file's data in the string object 'text'
> myfile.seek(0)
> text = myfile.read()
>
> for i in range(2):
> ? ? ? ? #def textParse(text, reRun):
> ? ? ? ? print 'how many times is this getting executed', i
>
> ? ? ? ? #Now to create the newfile 'test' and write our 'text'
> ? ? ? ? newfile = open('Steve_query3_out.csv', 'w')
> ? ? ? ? #open the new file and set it with 'w' for "write"
> ? ? ? ? #loop trough 'text' clean them up and write them into the 'newfile'
> ? ? ? ? ? ? ? ? ? ? ? ? #sub( ? pattern, repl, string[, count])
> ? ? ? ? ? ? ? ? ? ? ? ? #"sub("(?i)b+", "x", "bbbb BBBB")" returns 'x x'.
> ? ? ? ? text = re.sub('(\<(/?[^\>]+)\>)', "", text)#remove the HTML
> ? ? ? ? text = re.sub('/<!--(.|\s)*?-->/', "", text) #remove comments ?<!--[^
> \-]+-->
> ? ? ? ? text = re.sub('\/\*(.|\s)*?;}', "", text) #remove css formatting
> ? ? ? ? #remove a bunch of word formatting yuck
> ? ? ? ? text = re.sub("&nbsp;", " ", text)
> ? ? ? ? text = re.sub("&lt;", "<", text)
> ? ? ? ? text = re.sub("&gt;", ">", text)
> ? ? ? ? text = re.sub("&quot;|&rquot;|&ldquo;", "\'", text)
> #===================================
> #The two following lines are the ones giving me the problems
> ? ? ? ? text = re.sub("w:(.|\s)*?\n", "", text)
> ? ? ? ? text = re.sub("UnhideWhenUsed=(.|\s)*?\n", "", text)
> #===========================================
> ? ? ? ? text = re.sub(re.compile('^\r?\n?$', re.MULTILINE), '', text) #remove
> the extra whitespace
> ? ? ? ? #now write out the new file and close it
> ? ? ? ? newfile.write(text)
> ? ? ? ? newfile.close()
>
> ? ? ? ? #open the newfile and run the script again
> ? ? ? ? #Open the file and taking its data
>
> ? ? ? ? myfile=open('Steve_query3_out.csv') #Steve_query_test.csv
> ? ? ? ? #store all file's data in the string object 'text'
> ? ? ? ? myfile.seek(0)
> ? ? ? ? text = myfile.read()
>
> Thanks for the help,
>
> -Jared

Can you give a string that you would expect the regex to match and
what the expected result would be? Currently, it looks like the
interesting part of the regex (.|\s)*? would match any character of
any length once. There seems to be some redundancy that makes it more
confusing then it needs to be. I'm pretty sure that . will also match
anything that \s will match or maybe you just need to escape . because
you meant for it to be a literal.


From ldo at geek-central.gen.new_zealand  Fri May 29 21:35:37 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 30 May 2009 13:35:37 +1200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
	<gvkoep$oii$3@lust.ihug.co.nz>
	<0dcfcb4a-8844-420b-b2e2-c8e68419774d@p6g2000pre.googlegroups.com>
Message-ID: <gvq2h9$sos$3@lust.ihug.co.nz>

In message <0dcfcb4a-8844-420b-b2e2-
c8e68419774d at p6g2000pre.googlegroups.com>, John Machin wrote:

> If you need to escape % or _ in a LIKE argument, do whatever the host
> convention is.
> E.g. you are searching for text that contains literally "5% discount",
> with SQLite you could do:
> [avoiding backslashes and concomitant confusion]
>   LIKE '%5~% discount%' ESCAPE '~'
> on the command line, so using DB-API:
>   like_expr = user_input.replace("~", "~~").replace("%", "~%").replace
> (etc etc)

Sounds like an amazingly complicated, roundabout and not even reliable way 
of doing it.



From gagsl-py2 at yahoo.com.ar  Fri May 29 21:41:03 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 29 May 2009 22:41:03 -0300
Subject: FILE object in Python3.0 extension modules
References: <ce7a9fa5-0e35-47b4-bd4e-a68415aca1d5@h11g2000yqb.googlegroups.com>
Message-ID: <op.uupyypi5x6zn5v@gabriel.sleipnir-bsas>

En Fri, 29 May 2009 06:52:15 -0300, Joachim Dahl <dahl.joachim at gmail.com>  
escribi?:

> In Python2.x, I used PyFile_Check(obj) to check if a parameter was a
> file object.
>
> Now, in Python3.0 the same object (obtained as open('file.bin','wb'))
> is an
> io.BufferedWriter object.
>
> How do I perform type checking for such an object in the extension
> module,

I don't know which is the preferred way to check for a file object in 3.x  
- I hope someone can answer this more precisely. In principle, a file  
inherits from io.IOBase, but this class is defined in io.py and probably  
isn't intended to be used in C code. Other alternatives are _io._IOBase,  
PyIOBase_Type, and io.FileIO/_io.FileIO

> and how do I extract a FILE * object from it?  I browsed the C API
> documentation,  but
> couldn't find an answer.

I'd use PyObject_AsFileDescriptor
http://docs.python.org/dev/py3k/c-api/file.html

(Notice that the documentation is outdated; the PyFileObject type does not  
exist anymore, and a file isn't a wrapper around a FILE struct either)

> The purpose is to dump the contents of a Python extension type to disk
> as
> binary data using C's fwrite() function.

 From the above, I'd use write() with the file descriptor obtained from  
PyObject_AsFileDescriptor.

-- 
Gabriel Genellina



From lie.1296 at gmail.com  Fri May 29 21:41:44 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sat, 30 May 2009 01:41:44 GMT
Subject: How does Python's OOP feel?
In-Reply-To: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
Message-ID: <s90Ul.14593$y61.3202@news-server.bigpond.net.au>

Ikon wrote:
> I'm rather new to Python. I have PHP for my main language and I do
> some Java. They all have a very strict OO schema. As I red through
> Python's tutorial it seams it has nothing of those rules. No statical,
> abstract classes, functions, or variables.
> 
> I wish someone, who has experience in both Java/PHP/C# and Python
> would tell me how mush better/worse is it to program in a language
> that misses most of the OO parts!

import antigravity


From lie.1296 at gmail.com  Fri May 29 21:55:21 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sat, 30 May 2009 01:55:21 GMT
Subject: newbie: popen question
In-Reply-To: <662556cb-f2b4-4a6c-a612-176478612c12@q14g2000vbn.googlegroups.com>
References: <328e5cd4-bc4e-47bf-b8e2-91764351c525@g22g2000pra.googlegroups.com>
	<75004846-9f60-401f-9a7b-adbc28add28b@x31g2000prc.googlegroups.com>
	<gvm079$asb$1@hoshi.visyn.net>
	<662556cb-f2b4-4a6c-a612-176478612c12@q14g2000vbn.googlegroups.com>
Message-ID: <dm0Ul.14597$y61.6251@news-server.bigpond.net.au>

thebiggestbangtheory at gmail.com wrote:
> On May 28, 5:31 am, Sebastian Wiesner <basti.wies... at gmx.net> wrote:
>> <Sean DiZazzo ? Donnerstag, 28. Mai 2009 10:11>
>>
>>> Your best bet is to make sudo not ask for a password.  :)  If you
>>> don't have the rights, then you can use pexpect to do what you want to
>>> do.  http://pexpect.sourceforge.net/pexpect.html
>>> See the second example on that page.
>>> child = pexpect.spawn('scp foo myn... at host.example.com:.')
>>> child.expect ('Password:')
>>> child.sendline (mypassword)
>> The sudo password prompt is very configurable, so changing the configuration
>> to allow execution without password input is really the best option.
>>
>> --
>> Freedom is always the freedom of dissenters.
>>                                       (Rosa Luxemburg)
> 
> Thanks guys for helping out! very good answers :-)
> 
> Before I saw your answers, I tried the following,
> 
> output = subprocess.Popen(["sudo","-b", "code.sh", "arg1"],
> stdout=subprocess.PIPE).communicate()[0]
> 
> This seemed to push the shell execution process to the background and
> because my python program was invoked initially with sudo, it seems I
> did not need to enter a passwd again.
> 
> Any comments about this..any issues that you see will crop up?
> 
> Thanks a ton again.
> 
> 
> 

Is using gksu or kdesu feasible? Or maybe you could run "sudo -v" which
activates sudo then immediately run your "sudo command". This relies on
sudo not configured to not use timestamp though.


From gagsl-py2 at yahoo.com.ar  Fri May 29 22:00:19 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 29 May 2009 23:00:19 -0300
Subject: FILE object in Python3.0 extension modules
References: <ce7a9fa5-0e35-47b4-bd4e-a68415aca1d5@h11g2000yqb.googlegroups.com>
	<loom.20090529T114655-291@post.gmane.org>
Message-ID: <op.uupzutvax6zn5v@gabriel.sleipnir-bsas>

En Fri, 29 May 2009 08:48:26 -0300, Benjamin Peterson  
<benjamin at python.org> escribi?:

> Joachim Dahl <dahl.joachim <at> gmail.com> writes:
>>
>> How do I perform type checking for such an object in the extension
>> module,
>> and how do I extract a FILE * object from it?  I browsed the C API
>> documentation,  but
>> couldn't find an answer.
>
> You use PyObject_IsInstance to test if the object is an instance of  
> io.IOBase.

But you have to import the io module first, don't you? That's not usually  
necesary for most built in types -- e.g. PyFloat_Check just checks for a  
float object.

-- 
Gabriel Genellina



From benjamin at python.org  Fri May 29 22:24:32 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 30 May 2009 02:24:32 +0000 (UTC)
Subject: FILE object in Python3.0 extension modules
References: <ce7a9fa5-0e35-47b4-bd4e-a68415aca1d5@h11g2000yqb.googlegroups.com>
	<loom.20090529T114655-291@post.gmane.org>
	<op.uupzutvax6zn5v@gabriel.sleipnir-bsas>
Message-ID: <loom.20090530T022320-508@post.gmane.org>

Gabriel Genellina <gagsl-py2 <at> yahoo.com.ar> writes:
> But you have to import the io module first, don't you? That's not usually  
> necesary for most built in types -- e.g. PyFloat_Check just checks for a  
> float object.

Well, in 3.x, file is not longer a builtin type.






From sjmachin at lexicon.net  Fri May 29 22:51:32 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 29 May 2009 19:51:32 -0700 (PDT)
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org> 
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de> 
	<gvkoep$oii$3@lust.ihug.co.nz>
	<0dcfcb4a-8844-420b-b2e2-c8e68419774d@p6g2000pre.googlegroups.com>
	<gvq2h9$sos$3@lust.ihug.co.nz>
Message-ID: <55520c08-5b02-4231-b0f3-74eadecd6fd7@g1g2000yqh.googlegroups.com>

On May 30, 11:35?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <0dcfcb4a-8844-420b-b2e2-
>
> c8e684197... at p6g2000pre.googlegroups.com>, John Machin wrote:
> > If you need to escape % or _ in a LIKE argument, do whatever the host
> > convention is.
> > E.g. you are searching for text that contains literally "5% discount",
> > with SQLite you could do:
> > [avoiding backslashes and concomitant confusion]
> > ? LIKE '%5~% discount%' ESCAPE '~'
> > on the command line, so using DB-API:
> > ? like_expr = user_input.replace("~", "~~").replace("%", "~%").replace
> > (etc etc)
>
> Sounds like an amazingly complicated, roundabout and not even reliable way
> of doing it.

Please (a) explain what you mean (b) suggest a better way.


From gagsl-py2 at yahoo.com.ar  Fri May 29 23:56:52 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 30 May 2009 00:56:52 -0300
Subject: Trying to get cleaner XML output from a text file
References: <cf161cdb-a623-496a-af42-bb4d06ae74cb@s16g2000vbp.googlegroups.com>
Message-ID: <op.uup482qjx6zn5v@gabriel.sleipnir-bsas>

En Fri, 29 May 2009 14:09:10 -0300, iainemsley <iainemsley at googlemail.com>  
escribi?:

> I'm using Python2.5 to try and convert some text files into XML using
> xml.minidom. I'm currently doing some plays which have a structure
> like
> Scene 1
> Act 1
> blah blah
> Act2
> blah blah
> Scene 2
> Act 1
> and so on.

(I think you get the hierarchy wrong: usually a play contains some Acts;  
each act contains several Scenes)

> I'm trying to turn it into
> <div type="scene">1
>   <div type="act">1
>    <speech />
>   </div>
>   <div type="act">2
>    <speech />
>   </div>
> </div>
> (or ideally <div type="scene" id="1"> bit I can always come back to
> this later)

Using ElementTree is a lot easier than minidom:

import sys
 from itertools import groupby, count
import xml.etree.ElementTree as ET
import re

class Seq:
     "Automatic sequencer for acts/scenes"
     def __init__(self):
         self.act_nr = count(1)
         self.scene_nr = count(1)
     def next_scene(self):
         return self.scene_nr.next()
     def next_act(self):
         self.scene_nr = count(1)
         return self.act_nr.next()
seq = Seq()

def add_act(body, act_text):
     act = ET.SubElement(body, "div", type="act", id="a%s" % seq.next_act())
     for scene_text in scene_sep.split(act_text):
         add_scene(act, scene_text)

def add_scene(act, scene_text):
     scene = ET.SubElement(act, "div", type="scene", id="%ss%s" %  
(act.get("id"), seq.next_scene()))
     for p in paragraphs(scene_text.splitlines(True)):
         add_speech(scene, p)

def add_speech(scene, p):
     speech = ET.SubElement(scene, "speech")
     speech.text = p

body = ET.Element("body")
scene_sep = re.compile(r"Scene\s+[1-9]+", re.I)
act_sep = re.compile(r"Act\s+[1-9]+", re.I)
for act_text in act_sep.split(text):
     add_act(body, act_text)

doc = ET.ElementTree(body)
doc.write(sys.stdout)


-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Sat May 30 00:11:33 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 30 May 2009 01:11:33 -0300
Subject: FILE object in Python3.0 extension modules
References: <ce7a9fa5-0e35-47b4-bd4e-a68415aca1d5@h11g2000yqb.googlegroups.com>
	<loom.20090529T114655-291@post.gmane.org>
	<op.uupzutvax6zn5v@gabriel.sleipnir-bsas>
	<loom.20090530T022320-508@post.gmane.org>
Message-ID: <op.uup5xjo1x6zn5v@gabriel.sleipnir-bsas>

En Fri, 29 May 2009 23:24:32 -0300, Benjamin Peterson  
<benjamin at python.org> escribi?:

> Gabriel Genellina <gagsl-py2 <at> yahoo.com.ar> writes:
>> But you have to import the io module first, don't you? That's not  
>> usually
>> necesary for most built in types -- e.g. PyFloat_Check just checks for a
>> float object.
>
> Well, in 3.x, file is not longer a builtin type.

Ok, seems the old "file" type has been demoted and atomized...

-- 
Gabriel Genellina



From bsk16 at case.edu  Sat May 30 00:50:12 2009
From: bsk16 at case.edu (Benjamin Kaplan)
Date: Sat, 30 May 2009 00:50:12 -0400
Subject: How does Python's OOP feel?
In-Reply-To: <s90Ul.14593$y61.3202@news-server.bigpond.net.au>
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
	<s90Ul.14593$y61.3202@news-server.bigpond.net.au>
Message-ID: <ec96e1390905292150n56f2fcd3w69ad9186a6ad674f@mail.gmail.com>

On Fri, May 29, 2009 at 9:41 PM, Lie Ryan <lie.1296 at gmail.com> wrote:

> Ikon wrote:
> > I'm rather new to Python. I have PHP for my main language and I do
> > some Java. They all have a very strict OO schema. As I red through
> > Python's tutorial it seams it has nothing of those rules. No statical,
> > abstract classes, functions, or variables.
> >
> > I wish someone, who has experience in both Java/PHP/C# and Python
> > would tell me how mush better/worse is it to program in a language
> > that misses most of the OO parts!
>
> import antigravity


You forgot the link. http://www.xkcd.com/353/

>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From bellman at lysator.liu.se  Sat May 30 01:44:57 2009
From: bellman at lysator.liu.se (Thomas Bellman)
Date: Sat, 30 May 2009 05:44:57 +0000 (UTC)
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
	<gvlppt$hk0$1@news.lysator.liu.se> <gvmudo$25d$2@lust.ihug.co.nz>
Message-ID: <gvqh4p$obn$1@news.lysator.liu.se>

Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:

> In message <gvlppt$hk0$1 at news.lysator.liu.se>, Thomas Bellman wrote:

>> Speaking as a sysadmin, running applications for production,
>> programs not using SO_REUSEADDR should be taken out and shot.

>> Not using SO_REUSEADDR means forcing a service interruption of
>> half an hour (IIRC) if for some reason the service must be
>> restarted, or having to reboot the entire machine.

> No, you do not recall correctly.

*Tests*  It seems to be 100 seconds in Fedora 9 and 60 seconds in
Solaris 10.  OK, that amount of time is not totally horrible, in
many cases just annoying.  Still much longer for an interruption
of service that could have been just 1-2 seconds.

However, I *have* used systems where it took much longer.  It was
slightly more than ten years ago, under an earlier version of
Solaris 2, problably 2.4.  It may be that it only took that long
under certain circumstances that the application we used always
triggered, but we did have to wait several tens of minutes.  It
was way faster to reboot the machine than waiting for the sockets
to time out.

> And anybody wanting to reboot a machine to
> work around a "problem" like that should be taken out and shot.

We weren't exactly keen on rebooting the machine, but it was the
fastest way of getting out of that situation that we could figure
out.  How *should* we have dealt with it in your opinion?


-- 
Thomas Bellman,   Lysator Computer Club,   Link??ping University,  Sweden
"God is real, but Jesus is an integer."      !  bellman @ lysator.liu.se
                                             !  Make Love -- Nicht Wahr!


From zak.mc.kraken at libero.it  Sat May 30 02:38:46 2009
From: zak.mc.kraken at libero.it (Vito De Tullio)
Date: Sat, 30 May 2009 08:38:46 +0200
Subject: problem with pylint + PyQt4
Message-ID: <gvqk9k$a43$1@ger.gmane.org>

I'm having probles using pylint on a PyQt4 application.

$ cat TEST_pylint.py 
import PyQt4.QtCore                
from PyQt4.QtGui import QApplication

$ python TEST_pylint.py # no import errors

$ pylint --disable-msg=C0103 --disable-msg=C0111 --disable-msg=W0611 \
>     TEST_pylint.py
************* Module TEST_pylint
E:  1: No name 'QtCore' in module 'PyQt4'
E:  2: No name 'QtGui' in module 'PyQt4'
[...cut...]

$ pylint --version
pylint 0.15.0,
astng 0.17.3, common 0.35.0
Python 2.6 (r26:66714, Feb  3 2009, 20:52:03)
[GCC 4.3.2 [gcc-4_3-branch revision 141291]]

$ rpm -q python-qt4
python-qt4-4.5.snapshot.20090507-9.3

why pylint can't find the PyQt4 submodules?

-- 
By ZeD



From stefan_ml at behnel.de  Sat May 30 04:00:22 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 30 May 2009 10:00:22 +0200
Subject: lxml: traverse xml tree and retrieve element based on an attribute
In-Reply-To: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>
References: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>
Message-ID: <4a20e796$0$32666$9b4e6d93@newsspool2.arcor-online.net>

byron wrote:
> I am using the lxml.etree library to validate an xml instance file
> with a specified schema that contains the data types of each element.
> This is some of the internals of a function that extracts the
> elements:
> 
>         schema_doc = etree.parse(schema_fn)
>         schema = etree.XMLSchema(schema_doc)
> 
>         context = etree.iterparse(xml_fn, events=('start', 'end'),
> schema=schema)
> 
>         # get root
>         event, root = context.next()
> 
>         for event, elem in context:
>             if event == 'end' and elem.tag == self.tag:
>                 yield elem
>             root.clear()

Note that you cannot modify the root element during iterparse() in
lxml.etree. It seems to work for you here, but it's not safe. Here's a
better way to do this.

http://www.ibm.com/developerworks/xml/library/x-hiperfparse/#N100FF

Stefan


From ken at seehart.com  Sat May 30 04:12:09 2009
From: ken at seehart.com (Ken Seehart)
Date: Sat, 30 May 2009 01:12:09 -0700
Subject: Browser based Canvas UI?
In-Reply-To: <m2eiu7g5xv.fsf@cs.uu.nl>
References: <alpine.DEB.1.10.0905291352130.14054@urchin.earth.li>
	<m2eiu7g5xv.fsf@cs.uu.nl>
Message-ID: <4A20EA59.50108@seehart.com>

A couple years ago I stumbled upon an interesting technology but I can't 
seem to find it, and I can remember what it is called.  Unfortunately 
this makes it difficult to search for.  I am am aware of several partial 
matches (items that meet a subset of the requirement listed below).  
Does anyone know what does /all/ of the following?

1. Works on at least FF and IE on XP and Linux out of the box, probably 
others

2. Does not require /any/ plugin download at all of any kind to view 
(this disqualifies flash, svg, silverlight, java, and others)

3. If you go to the web page for the first time on a freshly installed 
operating system, without admin privileges, you will see the 
functionality listed below immediately, and with no downloaded plugins 
and installers.  (I apologize for the redundancy, but I want to 
preemptively avoid a flood of non-applicable responses).

4. Graphics, including sprite animation

5. Dynamic response to mouse motion: dragging sprites for example

6. Programmable in Python, of course

Hints from what I can recall:
- Built from javascript as it's raw material under the hood (after all, 
it can't very well be anything else given requirements 1,2,3)
- Seems quite magical since I didn't know the necessary graphical raw 
materials existed in javascript
- I think it's based on Ajax, but I can't seem to find a relevant python 
demo of it due to too much clutter in my google searches

Ken



From piet at cs.uu.nl  Sat May 30 04:30:41 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 30 May 2009 10:30:41 +0200
Subject: Python, Tkinter and popen problem
References: <mailman.803.1243448972.8015.python-list@python.org>
	<gvk2br$6bg$03$1@news.t-online.com>
	<mailman.811.1243469678.8015.python-list@python.org>
	<gvlnh2$n7t$02$1@news.t-online.com>
	<mailman.855.1243537386.8015.python-list@python.org>
	<m2d49sck8f.fsf@cs.uu.nl>
	<mailman.908.1243640893.8015.python-list@python.org>
Message-ID: <m2d49rdmby.fsf@cs.uu.nl>

>>>>> norseman <norseman at hughes.net> (n) wrote:

>n> Piet van Oostrum wrote:
>>>>>>>> norseman <norseman at hughes.net> (n) wrote:
>>> 
>n> I have tried both and Popen2.popen2().
>n> os.popen runs both way, contrary to docs.
>>> 
>>> What do you mean `os.popen runs both way'?

>n> It reads from child while console writes directly to child -  thus
>n> eliminating the problem of coding a pass through from master.

Yes, but that is not `both way': popen connects the parent to the child
through a pipe. The pipe works one way: from the child to the parent
with 'r' (default), from the parent to the child with 'w'. You can't
communicate the other way through the pipe. So the communication from
the parent process to the child through the popen is ONE WAY. If you
want TWO WAY communication you can use popen2, or better use
subprocess.Popen.

A child process always inherits stdin, stdout and stderr from the parent
unless you change that (e.g. by redirecting to a pipe, like popen does
for one of them). It doesn't matter whether you use os.popen,
subprocess.Popen, os.system, or os.fork to create the child process. So
in your case if the parent inputs from the console, so does the child.
But note: this is not communication from the parent process to the
child, but from YOU to the child. So the parent-child communication is
ONE WAY.

>n> "...
>>> doesn't work as the iterator for a file, including pipes, does a
>>> read ahead (see the doc on file.next()) and therefore is not suitable
>>> for interactive use.
>n> ..."

>n> If I understand you the above can be stated as:

>n> The above does not work as an iterator for any file type, including
>n> pipes, but it does do read aheads .... and therefore is not suitable for
>n> interactive use.

For files in general it is no problem because the contents of the file
is not interactively generated. Read ahead on a file works as long as
you do'nt use readline() on the file in between the iterator actions.
For a socket it could be the same problem if the other side generates
the output interactively.

>n> If that is correct then read ahead is simply buffered file reads (grab a
>n> chunk, parcel it out on demand) - yes?

I don't know, I have looked into the source code but it isn't clear to
me. I noticed that iteration didn't work and then looked up the
documentation. It talks about read ahead for efficiency.
 
>n> As for "... not suitable for interactive ..." Really?  Except for
>n> special purpose use the current interactive components are all buffered
>n> for read ahead use.  Check the actual code for your keyboard, your mouse
>n> and so forth. It's the read ahead that allows faster time to completion.
>n> It's why C-code has the putch function.

Yes, but they only read what is available. The iterator apparently tries
to read more and then has to wait.

>n> Yes - Sync IS the bigger hammer!  If that is what is needed - so be it.
>n> All character readers (byte at a time) should obey a flush(). Depending
>n> on type, code for the reader controls whether or not it flushes
>n> incomplete "lines" in the in-buffer(s). Proper implementation limits lost
>n> data on system crash.

I don't understand what you say here. As I told before it has nothing to
do with sync(). Also for reading there is no flush(); the flush() is
done on the other side of the pipe. Yes, and sync() has to do with
system crashes but that is not what we are talking about in this thread.

>n> In trying to use flush at the master side I keep getting messages
>n> indicating strings (completed or not) are not flushable.  Strange practice.

If you print to the console in the master the flush is done
automatically.

>n> ---
>n> from subprocess import Popen, PIPE
>n> xx = Popen(["z6.py"], stdout=PIPE).stdout

>n> while True:
>n>     line = xx.readline()
>n>     if not line: break
>n>     print "\t" + line,
>n> ---
>n> DOES WORK on Python 2.5.2 on Slackware 10.2 - THANK YOU VERY MUCH!!!
>n> Isn't working on Windows. error message comes as one of two forms.
>n>   1- %1 not found       #as shown above
>n>   2- file not found     #as ...["python z6.py"]...
>n>         same            #as #2 even with full paths given

That should be Popen(["python", "z6.py"], stdout=PIPE).stdout
And then with both python and z6.py given as full paths.

>n> I get the impression subprocess ignores system things on Windows.
>n> The routines it purposes to replace do use them.  At any rate, subprocess
>n> is NOT consistent across platforms.

subprocess is, but Windows isn't. On Unix-like systems, the python
command is usually in your PATH, so just giving "python" works. In
Windows PATH is underused, and commands like python often are not in
PATH, unless you as a user has adapted the path, or maybe there is an
installation option to adapt the PATH. The reason probably is that in
Windows almost nobody uses the command line but only clicks and the PATH
is not relevant.

>n> Some questions:
>n> 	1) "...], stdout=PIPE).stdout
>n>                    ^            ^  why the double use?

It is not a double use. Popen(["z6.py"], stdout=PIPE) gives you a Popen
object, not a file object. If you add .stdout you get the stdout
attribute of the Popen object of which you just before stated that it
should be a pipe. So the stdout=PIPE parameter makes it create a pipe,
and the .stdout returns you that pipe.

>n> 	2) "if not line: break"  what tells what to look for EOL
>n>                                    or is the use of 'line' missleading?
>n>                                    is it a byte at a time output?

No, line is a line, as indicated by the readline() call. The 
"if not line" is a test for end of file. In this case the end of the
child process (pipe closed).

>n>                                  how much CPU usage does the loop use?

Not much, It is mainly waiting for input but that doesn't consume CPU.

>n>                                  is there something in that loop that
>n>                                    uses the system pipe triggers to
>n>                                    reduce excessive CPU waste or does it
>n>                                    constantly poll?  If so where does
>n>                                    what code get put to signal (or set)
>n>                                    the courtesy semiphores so it does
>n>                                    not hog the system?

It doesn't poll or use semaphores. The beauty of a pipe is that it
automatically synchronises the reader and writer processes. If you do a
read on a pipe and it is empty the OS just blocks you. When the other
end writes something in the pipe, the OS will unblock you.

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From debatem1 at gmail.com  Sat May 30 04:52:30 2009
From: debatem1 at gmail.com (CTO)
Date: Sat, 30 May 2009 01:52:30 -0700 (PDT)
Subject: Browser based Canvas UI?
References: <alpine.DEB.1.10.0905291352130.14054@urchin.earth.li> 
	<m2eiu7g5xv.fsf@cs.uu.nl>
	<mailman.920.1243671153.8015.python-list@python.org>
Message-ID: <0b03f0ff-11ee-4ee2-ad2b-9c1516d22259@e21g2000yqb.googlegroups.com>

On May 30, 4:12?am, Ken Seehart <k... at seehart.com> wrote:
> A couple years ago I stumbled upon an interesting technology but I can't
> seem to find it, and I can remember what it is called. ?Unfortunately
> this makes it difficult to search for. ?I am am aware of several partial
> matches (items that meet a subset of the requirement listed below). ?
> Does anyone know what does /all/ of the following?
>
> 1. Works on at least FF and IE on XP and Linux out of the box, probably
> others
>
> 2. Does not require /any/ plugin download at all of any kind to view
> (this disqualifies flash, svg, silverlight, java, and others)
>
> 3. If you go to the web page for the first time on a freshly installed
> operating system, without admin privileges, you will see the
> functionality listed below immediately, and with no downloaded plugins
> and installers. ?(I apologize for the redundancy, but I want to
> preemptively avoid a flood of non-applicable responses).
>
> 4. Graphics, including sprite animation
>
> 5. Dynamic response to mouse motion: dragging sprites for example
>
> 6. Programmable in Python, of course
>
> Hints from what I can recall:
> - Built from javascript as it's raw material under the hood (after all,
> it can't very well be anything else given requirements 1,2,3)
> - Seems quite magical since I didn't know the necessary graphical raw
> materials existed in javascript
> - I think it's based on Ajax, but I can't seem to find a relevant python
> demo of it due to too much clutter in my google searches
>
> Ken

Probably thinking of Pyjamas- <URL: http://pyjamas.sourceforge.net/>.
It lets you interact with canvas- <URL: http://www.blobsallad.se/>-
without writing any javascript.

Geremy Condra


From tiskanto at gmail.com  Sat May 30 04:58:49 2009
From: tiskanto at gmail.com (Teguh Iskanto)
Date: Sat, 30 May 2009 18:58:49 +1000
Subject: How does Python's OOP feel?
In-Reply-To: <ec96e1390905292150n56f2fcd3w69ad9186a6ad674f@mail.gmail.com>
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
	<s90Ul.14593$y61.3202@news-server.bigpond.net.au>
	<ec96e1390905292150n56f2fcd3w69ad9186a6ad674f@mail.gmail.com>
Message-ID: <e137e8260905300158w5e18ff56x3169b4b3d4243163@mail.gmail.com>

On Sat, May 30, 2009 at 2:50 PM, Benjamin Kaplan <bsk16 at case.edu> wrote:

>
>
> On Fri, May 29, 2009 at 9:41 PM, Lie Ryan <lie.1296 at gmail.com> wrote:
>
>> Ikon wrote:
>> > I'm rather new to Python. I have PHP for my main language and I do
>> > some Java. They all have a very strict OO schema. As I red through
>> > Python's tutorial it seams it has nothing of those rules. No statical,
>> > abstract classes, functions, or variables.
>> >
>> > I wish someone, who has experience in both Java/PHP/C# and Python
>> > would tell me how mush better/worse is it to program in a language
>> > that misses most of the OO parts!
>>
>> import antigravity
>
>
> You forgot the link. http://www.xkcd.com/353/
>


ha ha ha ha +1
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From martin at hvidberg.net  Sat May 30 05:33:03 2009
From: martin at hvidberg.net (martin at hvidberg.net)
Date: Sat, 30 May 2009 02:33:03 -0700 (PDT)
Subject: Q: finding distance between 2 time's
Message-ID: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>

I made this little script (below) to look througt a dir to see if
there are any files newer than .e.g. 1 hour.
I have the loop through the dir working and can retreive file time as
well as present time.
both time variables are in the format returned by time.localtime()

My question:
How do I find the difference between such two time variables, to
calculate the 'age' of the file?

:-) Martin

------8<------ Code begin -------------

import os, time

def buildList(directory):
    listing = os.listdir(directory)
    for x in listing:
        x = os.path.join(directory, x)
        if os.path.isdir(x):
            print ('dir -> %s') % x
        if os.path.isfile(x):
            tstF = time.localtime(os.path.getmtime(x))
            nSize = os.path.getsize(x)
            print ('fil -> %s %d @ %s') % (x, nSize, time.asctime
(tstF))
    return 0

tstN = time.localtime()
print tstN
print "Time now: %s" % time.asctime(tstN)
buildList('C:\Martin\Work\Work_Eclipse\.metadata')




From ken at seehart.com  Sat May 30 06:01:20 2009
From: ken at seehart.com (Ken Seehart)
Date: Sat, 30 May 2009 03:01:20 -0700
Subject: How does Python's OOP feel?
In-Reply-To: <ec96e1390905292150n56f2fcd3w69ad9186a6ad674f@mail.gmail.com>
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>	<s90Ul.14593$y61.3202@news-server.bigpond.net.au>
	<ec96e1390905292150n56f2fcd3w69ad9186a6ad674f@mail.gmail.com>
Message-ID: <4A2103F0.4070603@seehart.com>

Benjamin Kaplan wrote:
>
>
> On Fri, May 29, 2009 at 9:41 PM, Lie Ryan <lie.1296 at gmail.com 
> <mailto:lie.1296 at gmail.com>> wrote:
>
>     Ikon wrote:
>     > I'm rather new to Python. I have PHP for my main language and I do
>     > some Java. They all have a very strict OO schema. As I red through
>     > Python's tutorial it seams it has nothing of those rules. No
>     statical,
>     > abstract classes, functions, or variables.
>     >
>     > I wish someone, who has experience in both Java/PHP/C# and Python
>     > would tell me how mush better/worse is it to program in a language
>     > that misses most of the OO parts!
>
Some of the concepts that you are looking for might be present in Python 
but may look different than you expect.   If you are defining OO in 
terms of rules and constraints, Python might come up short.   But if you 
are looking for the /benefits/ of OOP, Python does quite well.

I have experience with all of those languages.  More Java than PHP and 
C#, so I can talk about Python and Java.

Originally, the definition of OOP was about concepts such as loose 
coupling, reusable components, focusing on things rather than 
procedures, etc.  Later the prevalent definition became more about what 
you are not allowed to do than how to do what you want to do.  So now we 
put more stress on ideas like strict encapsulation.  For example, some 
purists even suggest that you can't claim to implement encapsulation 
unless you guarantee that there is no possible way to determine 
implementation details from outside.  Python "fails" here because it has 
introspective features that allow you to bypass the limitations that are 
deemed necessary for some artificially strict definition of OOP.  For 
example strictly speaking we don't have private members, but we can 
start a name with underscore or double-underscore which for all 
practical purposes gives all the advantages of private members if we 
assume a certain level of maturity from our programmers.  A less 
restrictive notion of encapsulation might be that objects can be managed 
without the need to know the implementation details.

If you think in terms of the enabling qualities of OOP, but not the 
constraints, Python does in fact score quite high.  We have multiple 
inheritance, abstraction (in the non-fascist sense), encapsulation 
(again in the non-fascist sense), really easy polymorphism, and plenty 
of support for decoupling.

When people claim that python is not OO, they are for the most part only 
able to cite what python fails to prevent you from doing, not what 
python fails to allow you to do.  At the same time, I must admit that 
the constraints imposed by stricter languages, such as compile time 
detection of certain errors, and performance benefits associated with 
static typing.  Fortunately, tools such as pylint and psyco can close 
these two respective gaps to a significant degree.

Okay, enough theory and straw man arguments :)  Here's how it /feels/ to me.

What is missing from Python, as compared to Java, is an oppressive 
system to prevent you from writing bugs no matter what.  As it turn out, 
I found that I was quite capable of writing bugs in Java in spite of 
it's extreme efforts to save me from myself.  I also found that Java 
requires a great deal more lines of code to get to the desired results.  
Most of the lines of code are about making the compiler happy.  If I try 
to do anything metaprogrammingish in Java, I soon start pulling my hair 
out.  After switching to mostly python, I have grown nearly all of my 
hair back.

Once the Java compiler is happy with the syntax, certain kinds of bugs 
are prevented that might exist in corresponding python code.  This is a 
win for Java.  However, because the code is more complex in Java, and 
because it is harder to add clever introspective debugging 
instrumentation, the remaining bugs are harder to find.  I believe that 
all other things being equal, less code is more robust than more code.

I highly recommend using pylint, BTW.  If you use pylint, you are just 
about as safe as you would be with a more oppressive language.

When it is all done, I find that I can get to a bug free, scalable, 
flexible, object oriented result much more quickly in Python than in 
Java, but YMMV.

In summary, Python has all of the capabilities of OOP, but lacks some of 
the constraints of OOP.  This lack of constraints has it's advantages 
and disadvantages, but on the whole, I like it.  What else can I say?

See also:
  http://www.ferg.org/projects/python_java_side-by-side.html

Ken


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From jkv at unixcluster.dk  Sat May 30 06:06:55 2009
From: jkv at unixcluster.dk (jkv)
Date: Sat, 30 May 2009 12:06:55 +0200
Subject: Q: finding distance between 2 time's
In-Reply-To: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
Message-ID: <4A21053F.8080408@unixcluster.dk>

Hi Martin,

What i usally do is to convert the two times to seconds since epoch and
compare the two values in seconds. You can use time.mktime to convert
localtime to seconds since epoch.

I added a few lines to your script, and now it ought to only print files
newer than 3601 seconds (3600 seconds is one hour).
The modification to you script is just some quick code, im pretty sure
on can compress it a bit.

Regards,
Johnny

script:

import os, time

def buildList(directory):
    listing = os.listdir(directory)
    for x in listing:
        x = os.path.join(directory, x)
        if os.path.isdir(x):
            print ('dir -> %s') % x
        if os.path.isfile(x):
            current_time = time.localtime()
            tstF = time.localtime(os.path.getmtime(x))
            #convert the current time to seconds since epoch
            current_epoch=time.mktime(current_time)
            #convert the timestamp on the file to seconds since epoch
            file_epoch = time.mktime(tstF)
            nSize = os.path.getsize(x)
            time_difference = current_epoch - file_epoch
            #if file newer than one hour print a line
            if time_difference < 3601:
              print ('NEW FILE -> %s %d @ %s') % (x, nSize, time.asctime
(tstF))
   return 0

tstN = time.localtime()
print tstN
print "Time now: %s" % time.asctime(tstN)
buildList('/')


martin at hvidberg.net wrote:
> I made this little script (below) to look througt a dir to see if
> there are any files newer than .e.g. 1 hour.
> I have the loop through the dir working and can retreive file time as
> well as present time.
> both time variables are in the format returned by time.localtime()
>
> My question:
> How do I find the difference between such two time variables, to
> calculate the 'age' of the file?
>
> :-) Martin
>
> ------8<------ Code begin -------------
>
> import os, time
>
> def buildList(directory):
>     listing = os.listdir(directory)
>     for x in listing:
>         x = os.path.join(directory, x)
>         if os.path.isdir(x):
>             print ('dir -> %s') % x
>         if os.path.isfile(x):
>             tstF = time.localtime(os.path.getmtime(x))
>             nSize = os.path.getsize(x)
>             print ('fil -> %s %d @ %s') % (x, nSize, time.asctime
> (tstF))
>     return 0
>
> tstN = time.localtime()
> print tstN
> print "Time now: %s" % time.asctime(tstN)
> buildList('C:\Martin\Work\Work_Eclipse\.metadata')
>
>
>   


-- 
Regards,
jkv
http://unixcluster.dk/public.key



From bearophileHUGS at lycos.com  Sat May 30 06:41:32 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sat, 30 May 2009 03:41:32 -0700 (PDT)
Subject: Questions about regex
References: <fe9f707f-aaf3-4ca6-859a-5b0c63904fc0@s28g2000vbp.googlegroups.com>
Message-ID: <54dd607a-d9fd-4ed2-91fd-690036734862@i6g2000yqj.googlegroups.com>

Jared.S., even if a regex doesn't look like a program, it's like a
small program written in a strange language. And you have to test and
comment your programs.
So I suggest you to program in a more tidy way, and add unit tests
(doctests may suffice here) to your regexes, you can also use the
verbose mode and comment them, and you can even indent their sub-parts
as pieces of a program.
You must test all your bricks (in python, not in TextMate) before
using them to build something bigger.

Bye,
bearophile


From ken at seehart.com  Sat May 30 07:46:05 2009
From: ken at seehart.com (Ken Seehart)
Date: Sat, 30 May 2009 04:46:05 -0700
Subject: Browser based Canvas UI?
In-Reply-To: <0b03f0ff-11ee-4ee2-ad2b-9c1516d22259@e21g2000yqb.googlegroups.com>
References: <alpine.DEB.1.10.0905291352130.14054@urchin.earth.li>
	<m2eiu7g5xv.fsf@cs.uu.nl>	<mailman.920.1243671153.8015.python-list@python.org>
	<0b03f0ff-11ee-4ee2-ad2b-9c1516d22259@e21g2000yqb.googlegroups.com>
Message-ID: <4A211C7D.5050309@seehart.com>

CTO wrote:
> On May 30, 4:12 am, Ken Seehart <k... at seehart.com> wrote:
>   
>> A couple years ago I stumbled upon an interesting technology but I can't
>> seem to find it, and I can remember what it is called.  Unfortunately
>> this makes it difficult to search for.  I am am aware of several partial
>> matches (items that meet a subset of the requirement listed below).  
>> Does anyone know what does /all/ of the following?
>>
>> 1. Works on at least FF and IE on XP and Linux out of the box, probably
>> others
>>
>> 2. Does not require /any/ plugin download at all of any kind to view
>> (this disqualifies flash, svg, silverlight, java, and others)
>>
>> 3. If you go to the web page for the first time on a freshly installed
>> operating system, without admin privileges, you will see the
>> functionality listed below immediately, and with no downloaded plugins
>> and installers.  (I apologize for the redundancy, but I want to
>> preemptively avoid a flood of non-applicable responses).
>>
>> 4. Graphics, including sprite animation
>>
>> 5. Dynamic response to mouse motion: dragging sprites for example
>>
>> 6. Programmable in Python, of course
>>
>> Hints from what I can recall:
>> - Built from javascript as it's raw material under the hood (after all,
>> it can't very well be anything else given requirements 1,2,3)
>> - Seems quite magical since I didn't know the necessary graphical raw
>> materials existed in javascript
>> - I think it's based on Ajax, but I can't seem to find a relevant python
>> demo of it due to too much clutter in my google searches
>>
>> Ken
>>     
>
> Probably thinking of Pyjamas- <URL: http://pyjamas.sourceforge.net/>.
> It lets you interact with canvas- <URL: http://www.blobsallad.se/>-
> without writing any javascript.
>
> Geremy Condra
>   
Yeah, looks like pyjamas is probably it.  Thanks.

OMG,  http://www.blobsallad.se is way too cool, .but it's javascript, so 
I'm assuming the idea is that it could have been done in python and 
converted to javascript using pyjamas.

Anyway, I think I need to be more specific about the sprites:

7. Supports drawing semi-transparent bitmap sprites (preferably png)

Anyone happen to know where I can find an online example of animating 
with sprites (within the constraints of 1-7 above)?

Thanks,
- Ken



From 2009 at jmunch.dk  Sat May 30 07:52:17 2009
From: 2009 at jmunch.dk (Anders J. Munch)
Date: Sat, 30 May 2009 13:52:17 +0200
Subject: Q: finding distance between 2 time's
In-Reply-To: <mailman.923.1243678617.8015.python-list@python.org>
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
Message-ID: <4a211df1$0$25199$ba624c82@nntp02.dk.telia.net>

jkv wrote:
> Hi Martin,
> 
> What i usally do is to convert the two times to seconds since epoch and
> compare the two values in seconds. You can use time.mktime to convert
> localtime to seconds since epoch.

There's no need to convert - simply retrieve the times as absolute times to 
begin with:

   file_age_in_seconds = time.time() - os.path.getmtime(filename)

Only convert to local time for presentation.

- Anders


From martin at hvidberg.net  Sat May 30 08:21:11 2009
From: martin at hvidberg.net (martin at hvidberg.net)
Date: Sat, 30 May 2009 05:21:11 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
	<4a211df1$0$25199$ba624c82@nntp02.dk.telia.net>
Message-ID: <00cd89ce-cab2-42bf-8b91-0b147e6763e1@t21g2000yqi.googlegroups.com>

Thanks both

The first answer is quite instuctive, the other one might be the one
I'll use in the code, it's nicely compact and clear.

So 2x thanks.

:-) Martin


From mail at microcorp.co.za  Sat May 30 08:28:21 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sat, 30 May 2009 14:28:21 +0200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>	<4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com><mailman.858.1243549462.8015.python-list@python.org>
	<woNTl.14450$y61.392@news-server.bigpond.net.au>
Message-ID: <001901c9e122$255a91c0$0d00a8c0@Hendrik>

"Lie Ryan" <lie.....6 at gmail.com> wrote:
> norseman wrote:
> > Suggestion:
> > Take a look at the top two most used OS you use and learn the default
> > (most often available) text editors that come with them.
> 
> Which means Notepad on Windows?

you could live dangerously and use WordPad...

- Hendrik



From steve at REMOVE-THIS-cybersource.com.au  Sat May 30 10:10:29 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 30 May 2009 14:10:29 GMT
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
Message-ID: <023130ef$0$19421$c3e8da3@news.astraweb.com>

On Sat, 30 May 2009 12:06:55 +0200, jkv wrote:

> I added a few lines to your script, and now it ought to only print files
> newer than 3601 seconds (3600 seconds is one hour). 
...
>     #if file newer than one hour print a line 
>     if time_difference < 3601:

That's a potential off-by-one error. That may print files that are older 
than one hour. Admittedly, they'll be off by less than one second, but if 
you're going to write code, write correct code. The right test is:

    if time_difference <= 3600:

(and you may even want to deal with files that have a *negative* time 
difference, e.g. they were created apparently in the future).

This is particularly necessary if you use time.time() to generate the 
current time, since that returns fractions of a second. But even if you 
don't, it's still the right thing to do: it's defensive programming. 
Rather than assume that all file systems store timestamps accurate only 
to a second, assume that some file system, somewhere, will be accurate to 
fractions of a second, and code accordingly.

That way, no matter what the file system does, your code will still do 
the right thing, and (in this case) it doesn't even cost you anything.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sat May 30 10:35:38 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 30 May 2009 14:35:38 GMT
Subject: Questions about regex
References: <fe9f707f-aaf3-4ca6-859a-5b0c63904fc0@s28g2000vbp.googlegroups.com>
Message-ID: <023136d4$0$19421$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 11:26:07 -0700, Jared.S.Bauer wrote:

> Hello,
> 
> I'm new to python and I'm having problems with a regular expression. I
> use textmate as my editor and when I run the regex in textmate it works
> fine, but when I run it as part of the script it freezes. Could anyone
> help me figure out why this is happening and how to fix it.


Sure. To figure out why it is happening, the first thing you must do is 
figure out *what* is happening. So first you have to isolate the fault: 
what part of your script is freezing?

I'm going to assume that it is the regex:

> #The two following lines are the ones giving me the problems
> 	text = re.sub("w:(.|\s)*?\n", "", text) 
>       text = re.sub("UnhideWhenUsed=(.|\s)*?\n", "", text)

What happens when you call those two lines in isolation, away from the 
rest of your script? (Obviously you need to initialise a value for text.)
Do they still freeze?

For example, I can do this:

>>> text = "Nobodyw: \n expects the Spanish Inquisition!"
>>> text = re.sub("w:(.|\s)*?\n", "", text)
>>> text = re.sub("UnhideWhenUsed=(.|\s)*?\n", "", text)
>>> text
'Nobody expects the Spanish Inquisition!'

and it doesn't freeze. It works fine.

I suspect that your problem is that the regex hasn't actually *frozen*, 
it's just taking a very, very long time to complete. My guess is that it 
probably has something to do with:

(.|\s)*?

This says, "Match any number of, but as few as possible, of any character 
or whitespace". This will match newlines as well, so the regular 
expression engine will need to do backtracking, which means it will be 
slow for large amounts of data. You want to reduce the amount of 
backtracking that's needed!

I *guess* that what you probably want is:

w:.*?\n

which will match the letter 'w' followed by ':' followed by the shortest 
number of arbitrary characters, including spaces *but not newlines*, 
followed by a newline.

The second regex will probably need a similar change made.

But don't take my word for it: I'm not a regex expert. But isolate the 
fault, identify when it is happening (for all input data, or only for 
large amounts of data?), and then you have a shot at fixing it.



-- 
Steven


From Eric_Dexter at msn.com  Sat May 30 10:42:03 2009
From: Eric_Dexter at msn.com (edexter)
Date: Sat, 30 May 2009 07:42:03 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com><mailman.858.1243549462.8015.python-list@python.org>
	<woNTl.14450$y61.392@news-server.bigpond.net.au>
	<mailman.925.1243686542.8015.python-list@python.org>
Message-ID: <802b4bfa-40b8-4459-b0c5-d5df5b61c181@n21g2000vba.googlegroups.com>

On May 30, 6:28?am, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:
> "Lie Ryan" <lie...... at gmail.com> wrote:
> > norseman wrote:
> > > Suggestion:
> > > Take a look at the top two most used OS you use and learn the default
> > > (most often available) text editors that come with them.
>
> > Which means Notepad on Windows?
>
> you could live dangerously and use WordPad...
>
> - Hendrik

I will sometimes use word pad but i perfer syntax highlighting.. I
have been tempted to fork out some cash what I would be after is to be
able to define my syntax file, the ability to use code snippits, the
ability to add tools and compilers...  until then I use spe, vim,
emacs, boa constructor, I had a couple of other ones but I probily
won't miss them that much.. The python to c compiler coming of age is
something I am looking foward to and is something I would like to have
supported in my editor (shedskin it is all coming back to me now).


From rtw at freenet.co.uk  Sat May 30 10:45:34 2009
From: rtw at freenet.co.uk (Rob Williscroft)
Date: Sat, 30 May 2009 09:45:34 -0500
Subject: Questions about regex
References: <fe9f707f-aaf3-4ca6-859a-5b0c63904fc0@s28g2000vbp.googlegroups.com>
Message-ID: <Xns9C1BA0C9D8372rtwfreenetREMOVEcouk@216.196.109.145>

 wrote in news:fe9f707f-aaf3-4ca6-859a-5b0c63904fc0
@s28g2000vbp.googlegroups.com in comp.lang.python:


>      text = re.sub('(\<(/?[^\>]+)\>)', "", text)#remove the HTML
> 

Python has a /r/ (raw) string literal type for regex's:

  text = re.sub( r'(\<(/?[^\>]+)\>)', "", text )

In raw strings python doesn't process backslash escape sequences
so r\n' is the 2 char' string '\\n' (a backslash folowed by an 'n').

Without that your pattern  string would need to be writen as:

  '(\\<(/?[^\\>]+)\\>)'

IOW backslashes need to be doubled up or python will process them
before they are passed to re.sub.

Also this seems to be some non-python dialect of regular expression
language, Pythons re's don't need to escape < and >.

http://docs.python.org/library/re.html

The grouping operators, '(' and ')', appear to be unnessasery,
so altogether this 1 line should probably be:

  text = re.sub( r'</?[^>]+>', '', text )

Rob.
-- 
http://www.victim-prime.dsl.pipex.com/


From sven.arduwie at gmail.com  Sat May 30 11:02:29 2009
From: sven.arduwie at gmail.com (Sven Arduwie)
Date: Sat, 30 May 2009 08:02:29 -0700 (PDT)
Subject: Python and Glade: window not showing
Message-ID: <01352f1b-11a6-448b-bbba-2b93794d4e7f@z19g2000vbz.googlegroups.com>

Can anyone help a python newbie and tell me why the simple window I
created in Glade is not showing?

This is the XML generated by Glade 3:
<?xml version="1.0"?>
<interface>
  <requires lib="gtk+" version="2.16"/>
  <!-- interface-naming-policy project-wide -->
  <object class="GtkWindow" id="helloWorld">
    <property name="visible">True</property>
    <signal name="destroy" handler="on_helloWorld_destroy"/>
    <child>
      <placeholder/>
    </child>
  </object>
</interface>

And this is the Python code:
#!/usr/bin/env python

import pygtk
pygtk.require("2.0")
import gtk

class HelloWorld(object):
	def getWindow(self):
		return self.window

	def setWindow(self, window):
		self.window = window

	window = property(getWindow, setWindow)

	def __init__(self):
		builder = gtk.Builder()
		builder.add_from_file("helloWorld.glade")
		builder.connect_signals({"on_helloWorld_destroy" :
self.onHelloWorldDestroy})
		self.window = builder.get_object("helloWorld")
		self.window.show()

	def onHelloWorldDestroy(self):
		pass

I ran this in a terminal on Ubuntu 9.04 like this:
sven at Dell:~$ cd ./gvfs/python\ on\ sven/
sven at Dell:~/gvfs/python on sven$ python ./helloWorld.py
sven at Dell:~/gvfs/python on sven$


From dudekksoft at gmail.com  Sat May 30 11:39:10 2009
From: dudekksoft at gmail.com (dudekksoft at gmail.com)
Date: Sat, 30 May 2009 08:39:10 -0700 (PDT)
Subject: PyQt4 + WebKit
Message-ID: <c6ef05ee-ac66-4d5c-9fd5-6882b39a1daf@t10g2000vbg.googlegroups.com>

Hello,

I need to grab clicked links in QWebView. Everything is fine when I
use linkClicked() signal. LinkDelegationPolicy is set to
DelegateAllLinks and there is a problem. If some site has Javascript
my procedure receives QUrl from linkClicked, next calls:

webView.setUrl(url) #Where "url" is received QUrl

Certainly this method doesn't work. Site loads again (in most cases
it's called http://mywwwsite.net/#). As I use
QWebPage::DelegateExternalLinks it happens the same, because my
procedure grabs links with Javascript. I don't know how to cope with
this problem. Maybe it's possible to set own policy in
QWebPage.LinkDelegationPolicy? Or maybe some other method to grab
protocol, host(if external or not) when user clicks link in webView?

Regards,
Konrad


From abeGong at gmail.com  Sat May 30 12:27:16 2009
From: abeGong at gmail.com (Abe)
Date: Sat, 30 May 2009 09:27:16 -0700 (PDT)
Subject: Compiling and transporting modules/libraries in python
Message-ID: <249dbf4f-ef3e-495e-975e-05d848279d39@u10g2000vbd.googlegroups.com>

Hi all -
  I hope this is a simple question, but I've been running in circles
trying to figure it out myself.  Is there a good way to wrap up a
library (e.g. numpy or matplotlib) so that I can use it on another
machine without actually installing it?

    I use python at a home office and in a university computer lab,
but I don't have the administrative rights to install libraries on the
lab computers.  It would be really nice if there were a way I could
put, say, all of numpy into a file "my_numpy.pyc" and treat it as a
single (large) module.

thanks
-Abe

PS - If the answer somehow involves compileall, could you spell it out
for me?  I haven't been able to figure how to make compileall work for
this.


From aahz at pythoncraft.com  Sat May 30 13:41:52 2009
From: aahz at pythoncraft.com (Aahz)
Date: 30 May 2009 10:41:52 -0700
Subject: How to ask smart questions question
References: <gvgkiv$61t$1@aioe.org>
	<mailman.756.1243349312.8015.python-list@python.org>
	<960af9f3-c445-4d6d-b277-76a123ee4dcd@s28g2000vbp.googlegroups.com>
Message-ID: <gvrr50$ivv$1@panix3.panix.com>

In article <960af9f3-c445-4d6d-b277-76a123ee4dcd at s28g2000vbp.googlegroups.com>,
Carl Banks  <pavlovevidence at gmail.com> wrote:
>On May 26, 7:48=A0am, Gary Herron <gher... at islandtraining.com> wrote:
>>
>> The proper response to a question like this has to be
>> =A0 =A0http://www.catb.org/~esr/faqs/smart-questions.html
>> as anything else is complete guesswork.
>
>Is there a Cliff's Notes version of this?
>
>I may be a cynic but I would think the people who ask bad questions
>are the same sort of people who won't have the patience to sit though
>this behemoth of an essay.

Perhaps linking directly to this would help:

http://www.catb.org/~esr/faqs/smart-questions.html#before

The table of contents contains a good summary for actually asking
questions.  Overall, I'm inclined to agree with people who argue that the
smart questions essay is a good filter; someone unwilling to put in the
work of reading and understanding it is also unwilling to put in the
effort to ask good questions.  I mean, I re-read most of that essay once
every couple of years myself.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From piet at cs.uu.nl  Sat May 30 13:51:25 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 30 May 2009 19:51:25 +0200
Subject: MySQLdb 1.2.2 + python 2.6.2
References: <e3d11715-765f-459d-9605-f323a1844304@h18g2000yqj.googlegroups.com>
Message-ID: <m24ov2eaxu.fsf@cs.uu.nl>

>>>>> monogeo <monogeo at gmail.com> (m) wrote:

>m> Hi all,
>m> Are MySQLdb 1.2.2 and python 2.6.2 compatible? I went to
>m> http://sourceforge.net/project/showfiles.php?group_id=22307, it
>m> doesn't say it is compatible or not.

>m> When trying to install MySQLdb 1.2.2 on my machine which is running
>m> python 2.6.2 and windows XP, I get this error below.

>m> I am able to install MySQLdb 1.2.2 successfully on another machine
>m> which is running python 2.5.4 and windows XP.

>m> Please help if you have any idea.

Try the 1.2.3 release candidate
http://sourceforge.net/project/showfiles.php?group_id=22307&package_id=34790&release_id=672239 
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From benjamin at python.org  Sat May 30 14:04:35 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 30 May 2009 13:04:35 -0500
Subject: [RELEASED] Python 3.1 Release Candidate 1
Message-ID: <1afaf6160905301104w203b5a76u5d9909942f91ecb4@mail.gmail.com>

On behalf of the Python development team, I'm happy to announce the first
release candidate of Python 3.1.

Python 3.1 focuses on the stabilization and optimization of the features and
changes that Python 3.0 introduced.  For example, the new I/O system has been
rewritten in C for speed.  File system APIs that use unicode strings now handle
paths with undecodable bytes in them. Other features include an ordered
dictionary implementation, a condensed syntax for nested with statements, and
support for ttk Tile in Tkinter.  For a more extensive list of changes in 3.1,
see http://doc.python.org/dev/py3k/whatsnew/3.1.html or Misc/NEWS in the Python
distribution.

This is a release candidate, and as such, we do not recommend use in production
environments.  However, please take this opportunity to test the release with
your libraries or applications.  This will hopefully discover bugs before the
final release and allow you to determine how changes in 3.1 might impact you.
If you find things broken or incorrect, please submit a bug report at

     http://bugs.python.org

For more information and downloadable distributions, see the Python 3.1 website:

     http://www.python.org/download/releases/3.1/

See PEP 375 for release schedule details:

     http://www.python.org/dev/peps/pep-0375/



Enjoy,
-- Benjamin

Benjamin Peterson
benjamin at python.org
Release Manager
(on behalf of the entire python-dev team and 3.1's contributors)


From lkennedy5 at gmail.com  Sat May 30 14:15:30 2009
From: lkennedy5 at gmail.com (lsk040365)
Date: Sat, 30 May 2009 11:15:30 -0700 (PDT)
Subject: CRLF when doing os.system("ls -l") while using curses !!!
References: <dc9db609-f79c-4bd6-8777-7743e6628a68@z19g2000vbz.googlegroups.com>
	<m2hbz3edvp.fsf@cs.uu.nl>
Message-ID: <50d4b238-f90f-47df-9646-c6f1e50e640d@e24g2000vbe.googlegroups.com>

On May 29, 6:35?pm, Piet van Oostrum <p... at cs.uu.nl> wrote:
> >>>>> lkenne... at gmail.com (l) wrote:
> >l> Here is the code and as you can see for yourself, the output is not
> >l> coming out on the screen with CRLF like it should. ?How do I fix this?
>
> Don't use curses.
>
> Curses puts the terminal in raw mode (more or less) which doesn't
> translate the newline character into CRLF. If you use curses you are
> supposed to do all output through curses. But the os.system goes
> directly to the screen, outside of curses (because it is another
> process).
> You could catch the output of ls -l with a PIPE and then write the
> output to the curses screen with addstr. But a curses screen has a
> limited length, whereas your ls -l output may be larger so then you must
> implement some form of scrolling.
>
> >l> import curses, os
> >l> screen = curses.initscr()
> >l> os.system("ls -l")
> >l> curses.endwin()
>
> --
> Piet van Oostrum <p... at cs.uu.nl>
> URL:http://pietvanoostrum.com[PGP 8DAE142BE17999C4]
> Private email: p... at vanoostrum.org

Can you provide me with some sort of example possibly--I have been
fighting this for a while and I wouldn't be using curses but I have
designed the program with the extended ascii characters thereby making
a nice UI...?

Thanks in advance,
Lee


From castironpi at gmail.com  Sat May 30 14:20:47 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Sat, 30 May 2009 11:20:47 -0700 (PDT)
Subject: hash and __eq__
Message-ID: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>

I am writing a mapping object, and I want to ask about the details of
__hash__ and __eq__.  IIUC if I understand correctly, the Python
dict's keys' hash codes are looked up first in O( 1 ), then all the
matching hash entries are compared on equality in O( n ).  That is,
the hash code just really narrows down the search.  Am I correct?

P.S.  I always feel like my posts should start like, "A mapping object
am writing I."  Not too many verbs you can do that with in English.
What if I did it?


From sven.arduwie at gmail.com  Sat May 30 14:29:41 2009
From: sven.arduwie at gmail.com (Sven Arduwie)
Date: Sat, 30 May 2009 11:29:41 -0700 (PDT)
Subject: Python and Glade: window not showing
References: <01352f1b-11a6-448b-bbba-2b93794d4e7f@z19g2000vbz.googlegroups.com>
Message-ID: <f5e4561c-3559-414e-a807-d2f70e0c454e@j12g2000vbl.googlegroups.com>

On 30 mei, 17:02, Sven Arduwie <sven.ardu... at gmail.com> wrote:
> Can anyone help a python newbie and tell me why the simple window I
> created in Glade is not showing?
>
> This is the XML generated by Glade 3:
> <?xml version="1.0"?>
> <interface>
> ? <requires lib="gtk+" version="2.16"/>
> ? <!-- interface-naming-policy project-wide -->
> ? <object class="GtkWindow" id="helloWorld">
> ? ? <property name="visible">True</property>
> ? ? <signal name="destroy" handler="on_helloWorld_destroy"/>
> ? ? <child>
> ? ? ? <placeholder/>
> ? ? </child>
> ? </object>
> </interface>
>
> And this is the Python code:
> #!/usr/bin/env python
>
> import pygtk
> pygtk.require("2.0")
> import gtk
>
> class HelloWorld(object):
> ? ? ? ? def getWindow(self):
> ? ? ? ? ? ? ? ? return self.window
>
> ? ? ? ? def setWindow(self, window):
> ? ? ? ? ? ? ? ? self.window = window
>
> ? ? ? ? window = property(getWindow, setWindow)
>
> ? ? ? ? def __init__(self):
> ? ? ? ? ? ? ? ? builder = gtk.Builder()
> ? ? ? ? ? ? ? ? builder.add_from_file("helloWorld.glade")
> ? ? ? ? ? ? ? ? builder.connect_signals({"on_helloWorld_destroy" :
> self.onHelloWorldDestroy})
> ? ? ? ? ? ? ? ? self.window = builder.get_object("helloWorld")
> ? ? ? ? ? ? ? ? self.window.show()
>
> ? ? ? ? def onHelloWorldDestroy(self):
> ? ? ? ? ? ? ? ? pass
>
> I ran this in a terminal on Ubuntu 9.04 like this:
> sven at Dell:~$ cd ./gvfs/python\ on\ sven/
> sven at Dell:~/gvfs/python on sven$ python ./helloWorld.py
> sven at Dell:~/gvfs/python on sven$

Okay I'm mad at myself for forgetting this:

if __name__ == "__main__":
	helloWorld = HelloWorld()
	gtk.main()

When I add that, a new problem arises: the terminal floods with:
  File "./helloWorld.py", line 12, in setWindow
    self.window = window
  File "./helloWorld.py", line 12, in setWindow
    self.window = window
  File "./helloWorld.py", line 12, in setWindow
    self.window = window
ad infinitum


From davea at ieee.org  Sat May 30 15:02:35 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 30 May 2009 15:02:35 -0400
Subject: Python and Glade: window not showing
In-Reply-To: <f5e4561c-3559-414e-a807-d2f70e0c454e@j12g2000vbl.googlegroups.com>
References: <01352f1b-11a6-448b-bbba-2b93794d4e7f@z19g2000vbz.googlegroups.com>
	<f5e4561c-3559-414e-a807-d2f70e0c454e@j12g2000vbl.googlegroups.com>
Message-ID: <4A2182CB.1000309@ieee.org>

Sven Arduwie wrote:
> On 30 mei, 17:02, Sven Arduwie <sven.ardu... at gmail.com> wrote:
>   
>> Can anyone help a python newbie and tell me why the simple window I
>> created in Glade is not showing?
>>
>> This is the XML generated by Glade 3:
>> <?xml version=.0"?>
>> <interface>
>>   <requires lib=tk+" version="2.16"/>
>>   <!-- interface-naming-policy project-wide -->
>>   <object class=tkWindow" id="helloWorld">
>>     <property name=isible">True</property>
>>     <signal name=estroy" handler="on_helloWorld_destroy"/>
>>     <child>
>>       <placeholder/>
>>     </child>
>>   </object>
>> </interface>
>>
>> And this is the Python code:
>> #!/usr/bin/env python
>>
>> import pygtk
>> pygtk.require("2.0")
>> import gtk
>>
>> class HelloWorld(object):
>>         def getWindow(self):
>>                 return self.window
>>
>>         def setWindow(self, window):
>>                 self.window =indow
>>
>>         window =roperty(getWindow, setWindow)
>>
>>         def __init__(self):
>>                 builder =tk.Builder()
>>                 builder.add_from_file("helloWorld.glade")
>>                 builder.connect_signals({"on_helloWorld_destroy" :
>> self.onHelloWorldDestroy})
>>                 self.window =uilder.get_object("helloWorld")
>>                 self.window.show()
>>
>>         def onHelloWorldDestroy(self):
>>                 pass
>>
>> I ran this in a terminal on Ubuntu 9.04 like this:
>> sven at Dell:~$ cd ./gvfs/python\ on\ sven/
>> sven at Dell:~/gvfs/python on sven$ python ./helloWorld.py
>> sven at Dell:~/gvfs/python on sven$
>>     
>
> Okay I'm mad at myself for forgetting this:
>
> if __name__ ="__main__":
> 	helloWorld =elloWorld()
> 	gtk.main()
>
> When I add that, a new problem arises: the terminal floods with:
>   File "./helloWorld.py", line 12, in setWindow
>     self.window =indow
>   File "./helloWorld.py", line 12, in setWindow
>     self.window =indow
>   File "./helloWorld.py", line 12, in setWindow
>     self.window =indow
> ad infinitum
>
>   
You have infinite recursion because setWindow is defined indirectly in 
terms of itself.  It uses the property 'window', which is defined to use 
setWindow.

The cure for it is simple.  If you want to have a private data 
attribute, use a leading underscore.  Don't call it the same thing that 
the public is going to use.

class HelloWorld(object):
         def getWindow(self):
                 return self._window

         def setWindow(self, window):
                 self._window = window

         window = property(getWindow, setWindow)

         def __init__(self):
                 builder = gtk.Builder()
                 builder.add_from_file("helloWorld.glade")
                 builder.connect_signals({"on_helloWorld_destroy" :
 self.onHelloWorldDestroy})
                 self._window = builder.get_object("helloWorld")
                 self._window.show()

         def onHelloWorldDestroy(self):
                 pass


(untested)



From sven.arduwie at gmail.com  Sat May 30 15:16:47 2009
From: sven.arduwie at gmail.com (Sven Arduwie)
Date: Sat, 30 May 2009 12:16:47 -0700 (PDT)
Subject: Python and Glade: window not showing
References: <01352f1b-11a6-448b-bbba-2b93794d4e7f@z19g2000vbz.googlegroups.com>
	<f5e4561c-3559-414e-a807-d2f70e0c454e@j12g2000vbl.googlegroups.com> 
	<mailman.927.1243710171.8015.python-list@python.org>
Message-ID: <87947830-a16a-4c73-ba09-f963618158a3@t11g2000vbc.googlegroups.com>

On 30 mei, 21:02, Dave Angel <da... at ieee.org> wrote:
> Sven Arduwie wrote:
> > On 30 mei, 17:02, Sven Arduwie <sven.ardu... at gmail.com> wrote:
>
> >> Can anyone help a python newbie and tell me why the simple window I
> >> created in Glade is not showing?
>
> >> This is the XML generated by Glade 3:
> >> <?xml version=.0"?>
> >> <interface>
> >> ? <requires lib=tk+" version="2.16"/>
> >> ? <!-- interface-naming-policy project-wide -->
> >> ? <object class=tkWindow" id="helloWorld">
> >> ? ? <property name=isible">True</property>
> >> ? ? <signal name=estroy" handler="on_helloWorld_destroy"/>
> >> ? ? <child>
> >> ? ? ? <placeholder/>
> >> ? ? </child>
> >> ? </object>
> >> </interface>
>
> >> And this is the Python code:
> >> #!/usr/bin/env python
>
> >> import pygtk
> >> pygtk.require("2.0")
> >> import gtk
>
> >> class HelloWorld(object):
> >> ? ? ? ? def getWindow(self):
> >> ? ? ? ? ? ? ? ? return self.window
>
> >> ? ? ? ? def setWindow(self, window):
> >> ? ? ? ? ? ? ? ? self.window =indow
>
> >> ? ? ? ? window =roperty(getWindow, setWindow)
>
> >> ? ? ? ? def __init__(self):
> >> ? ? ? ? ? ? ? ? builder =tk.Builder()
> >> ? ? ? ? ? ? ? ? builder.add_from_file("helloWorld.glade")
> >> ? ? ? ? ? ? ? ? builder.connect_signals({"on_helloWorld_destroy" :
> >> self.onHelloWorldDestroy})
> >> ? ? ? ? ? ? ? ? self.window =uilder.get_object("helloWorld")
> >> ? ? ? ? ? ? ? ? self.window.show()
>
> >> ? ? ? ? def onHelloWorldDestroy(self):
> >> ? ? ? ? ? ? ? ? pass
>
> >> I ran this in a terminal on Ubuntu 9.04 like this:
> >> sven at Dell:~$ cd ./gvfs/python\ on\ sven/
> >> sven at Dell:~/gvfs/python on sven$ python ./helloWorld.py
> >> sven at Dell:~/gvfs/python on sven$
>
> > Okay I'm mad at myself for forgetting this:
>
> > if __name__ ="__main__":
> > ? ?helloWorld =elloWorld()
> > ? ?gtk.main()
>
> > When I add that, a new problem arises: the terminal floods with:
> > ? File "./helloWorld.py", line 12, in setWindow
> > ? ? self.window =indow
> > ? File "./helloWorld.py", line 12, in setWindow
> > ? ? self.window =indow
> > ? File "./helloWorld.py", line 12, in setWindow
> > ? ? self.window =indow
> > ad infinitum
>
> You have infinite recursion because setWindow is defined indirectly in
> terms of itself. ?It uses the property 'window', which is defined to use
> setWindow.
>
> The cure for it is simple. ?If you want to have a private data
> attribute, use a leading underscore. ?Don't call it the same thing that
> the public is going to use.
>
> class HelloWorld(object):
> ? ? ? ? ?def getWindow(self):
> ? ? ? ? ? ? ? ? ?return self._window
>
> ? ? ? ? ?def setWindow(self, window):
> ? ? ? ? ? ? ? ? ?self._window = window
>
> ? ? ? ? ?window = property(getWindow, setWindow)
>
> ? ? ? ? ?def __init__(self):
> ? ? ? ? ? ? ? ? ?builder = gtk.Builder()
> ? ? ? ? ? ? ? ? ?builder.add_from_file("helloWorld.glade")
> ? ? ? ? ? ? ? ? ?builder.connect_signals({"on_helloWorld_destroy" :
> ?self.onHelloWorldDestroy})
> ? ? ? ? ? ? ? ? ?self._window = builder.get_object("helloWorld")
> ? ? ? ? ? ? ? ? ?self._window.show()
>
> ? ? ? ? ?def onHelloWorldDestroy(self):
> ? ? ? ? ? ? ? ? ?pass
>
> (untested)

That solved the problem, thanks!

I assume that the getWindow and setWindow can be bypassed by using the
_window property directly and that Python has no visibility keywords
like private or protected. Sort of like PHP 4. (Not that I want to
compare Python to anything like that mess, lol ;))


From castironpi at gmail.com  Sat May 30 15:34:57 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Sat, 30 May 2009 12:34:57 -0700 (PDT)
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<mailman.928.1243710680.8015.python-list@python.org>
Message-ID: <c55618e4-b348-4a0e-a455-dd7080c1a740@b9g2000yqm.googlegroups.com>

On May 30, 12:11?pm, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> On Sat, 30 May 2009 11:20:47 -0700 (PDT), Aaron Brady
> <castiro... at gmail.com> declaimed the following in
> gmane.comp.python.general:
>
> > P.S. ?I always feel like my posts should start like, "A mapping object
> > am writing I." ?Not too many verbs you can do that with in English.
> > What if I did it?
>
> ? ? ? ? You turn into a short fuzzy large eared critter in a robe with a
> light-saber?

A fuzzy large eared critter turn I into.

"Ending sentences in prepositions is nonsense up with which I will not
put." -Churchill

I'm mimicking the dict type with an SQL table (something to which I
alluded some time ago).  I'm going to 'select' on the hash code, then
(*THEN*) revive the keys and compare on equality.  The values don't
need to be revived.

P.S.  def revive!


From invert314 at gmail.com  Sat May 30 16:11:40 2009
From: invert314 at gmail.com (Invert)
Date: Sat, 30 May 2009 16:11:40 -0400
Subject: IndexError: tuple index out of range
Message-ID: <4f64bbf10905301311k57be0a73pc445bb2d74f71a2a@mail.gmail.com>

My simple python script gives me an error when I try to execute it.  Here is
the error message:

daniel at ibex:~/Desktop/python$ python3 str_format2Daniel.py
> Traceback (most recent call last):
>   File "str_format2Daniel.py", line 8, in <module>
>     print ("{0} is {1} years old {3} and ".format(name, age, append))
> IndexError: tuple index out of range
> daniel at ibex:~/Desktop/python$
>

Here is my script:

#!/usr/bin/python
> # Filename: str_format2.py
>
> age = 23
> name = 'Daniel'
> append = '6 months'
>
> print ("{0} is {1} years old {3} and ".format(name, age, append))
> print ('{0} will be an elite python programmer in {2}.'.format(name,
> append))


What am I doing wrong?
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From Afro.Systems at gmail.com  Sat May 30 16:16:15 2009
From: Afro.Systems at gmail.com (Tzury Bar Yochay)
Date: Sat, 30 May 2009 13:16:15 -0700 (PDT)
Subject: how to free memory allocated by a function call via ctypes
Message-ID: <4105319d-efdd-4f64-938b-399131981849@m19g2000yqk.googlegroups.com>

Hi,

Suppose I have the following function
char *generateMessage(char *sender, char *reciever, char *message) ;

now in c I would normally do

char *msg = generateMessage(sender, reciever, message);
// do something
free(msg);

My question is how do I free the memory allocated when I call this
function using ctypes
I could not find this in the documentation for python 2.5

thanks


From piet at cs.uu.nl  Sat May 30 16:17:22 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 30 May 2009 22:17:22 +0200
Subject: CRLF when doing os.system("ls -l") while using curses !!!
References: <dc9db609-f79c-4bd6-8777-7743e6628a68@z19g2000vbz.googlegroups.com>
	<m2hbz3edvp.fsf@cs.uu.nl>
	<50d4b238-f90f-47df-9646-c6f1e50e640d@e24g2000vbe.googlegroups.com>
Message-ID: <m2ws7ycpm5.fsf@cs.uu.nl>

>>>>> lsk040365 <lkennedy5 at gmail.com> (l) wrote:

>l> Can you provide me with some sort of example possibly--I have been
>l> fighting this for a while and I wouldn't be using curses but I have
>l> designed the program with the extended ascii characters thereby making
>l> a nice UI...?

Nice UI???? This is so 70's :=)

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-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org

From piet at cs.uu.nl  Sat May 30 16:28:24 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 30 May 2009 22:28:24 +0200
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
Message-ID: <m2skimcp3r.fsf@cs.uu.nl>

>>>>> Aaron Brady <castironpi at gmail.com> (AB) wrote:

>AB> I am writing a mapping object, and I want to ask about the details of
>AB> __hash__ and __eq__.  IIUC if I understand correctly, the Python
>AB> dict's keys' hash codes are looked up first in O( 1 ), then all the
>AB> matching hash entries are compared on equality in O( n ).  That is,
>AB> the hash code just really narrows down the search.  Am I correct?

The O(1) part is correct. The O(n) is incorrect if n as usual is taken
to be the number of keys in the dict. But it is true if n is the number
of keys in the `bucket' that belongs to the hash value. The average
complexity of looking up a key is O(1).

See http://wiki.python.org/moin/DictionaryKeys
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From python at mrabarnett.plus.com  Sat May 30 16:33:00 2009
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 30 May 2009 21:33:00 +0100
Subject: IndexError: tuple index out of range
In-Reply-To: <4f64bbf10905301311k57be0a73pc445bb2d74f71a2a@mail.gmail.com>
References: <4f64bbf10905301311k57be0a73pc445bb2d74f71a2a@mail.gmail.com>
Message-ID: <4A2197FC.1020904@mrabarnett.plus.com>

Invert wrote:
> My simple python script gives me an error when I try to execute it.  
> Here is the error message:
> 
>     daniel at ibex:~/Desktop/python$ python3 str_format2Daniel.py
>     Traceback (most recent call last):
>       File "str_format2Daniel.py", line 8, in <module>
>         print ("{0} is {1} years old {3} and ".format(name, age, append))
>     IndexError: tuple index out of range
>     daniel at ibex:~/Desktop/python$
> 
> 
> Here is my script:
> 
>     #!/usr/bin/python
>     # Filename: str_format2.py
> 
>     age = 23
>     name = 'Daniel'
>     append = '6 months'
> 
>     print ("{0} is {1} years old {3} and ".format(name, age, append))

That should be:

     print ("{0} is {1} years old {2} and ".format(name, age, append))

>     print ('{0} will be an elite python programmer in {2}.'.format(name,
>     append))
> 
> 
> What am I doing wrong?
> 




From benjamin at python.org  Sat May 30 16:49:34 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 30 May 2009 20:49:34 +0000 (UTC)
Subject: how to free memory allocated by a function call via ctypes
References: <4105319d-efdd-4f64-938b-399131981849@m19g2000yqk.googlegroups.com>
Message-ID: <loom.20090530T204841-162@post.gmane.org>

Tzury Bar Yochay <Afro.Systems <at> gmail.com> writes:
> 
> My question is how do I free the memory allocated when I call this
> function using ctypes

The return type of ctypes.create_string_buffer() will call free() when it is
garbage collected.






From arnodel at googlemail.com  Sat May 30 16:55:19 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 30 May 2009 21:55:19 +0100
Subject: decoding keyboard input when using curses
Message-ID: <m2vdni1fbc.fsf@googlemail.com>

Hi all,

I am looking for advice on how to use unicode with curses.  First I will
explain my understanding of how curses deals with keyboard input and how
it differs with what I would like.

The curses module has a window.getch() function to capture keyboard
input.  This function returns an integer which is more or less:

* a byte if the key which was pressed is a printable character (e.g. a,
  F, &);

* an integer > 255 if it is a special key, e.g. if you press KEY_UP it
  returns 259.

As far as I know, curses is totally unicode unaware, so if the key
pressed is printable but not ASCII, the getch() function will return one
or more bytes depending on the encoding in the terminal.

E.g. given utf-8 encoding, if I press the key '?' on my keyboard (which
encoded as '\xc3\xa9' in utf-8), I will need two calls to getch() to get
this: the first one will return 0xC3 and the second one 0xA9.

Instead of getting a stream of bytes and special keycodes (with value >
255) from getch(), what I want is a stream of *unicode characters* and
special keycodes.

So, still assuming utf-8 encoding in the terminal, if I type:

    T?[KEY_UP]?a

iterating call to the getch() function will give me this sequence of
integers:

    84, 195, 169, 259,   195, 167, 97
    T-  ?-------  KEY_UP ?-------  a-

But what I want to get this stream instead:

    u'T', u'?', 259, u'?', u'a'


I can pipe the stream of output from getch() directly through an
instance of codecs.getreader('utf-8') because getch() sometimes returns
the integer values of the 'special keys'.

Now I will present to you the solution I have come up with so far.  I am
really unsure whether it is a good way to solve this problem as both
unicode and curses still feel quite mysterious to me.  What I would
appreciate is some advice on how to do it better - or someone to point
out that I have a gross misunderstanding of what is going on!

This has been tested in Python 2.5

-------------------- uctest.py ------------------------------
# -*- coding:utf-8 -*-

import codecs
import curses

# This gives the return codes given by curses.window.getch() when
# "T?[KEY_UP]?a" is typed in a terminal with utf-8 encoding:

codes = map(ord, "T?") + [curses.KEY_UP]  + map(ord, "?a")


# This class defines a file-like object from a curses window 'win'
# whose read() function will return the next byte (as a character)
# given by win.getch() if it's a byte or return the empty string and
# set the code attribute to the value of win.getch().

# It is not used in this test, The Stream class below is used
# instead.

class CursesStream(object):
    def __init__(self, win):
        self.getch = self.win.getch
    def read(self):
        c = self.getch()
        if c == -1:
            self.code = None
            return ''
        elif c > 255:
            self.code = c
            return ''
        else:
            return chr(c)

# This class simulates CursesStream above with a predefined list of
# keycodes to return - handy for testing.

class Stream(object):
    def __init__(self, codes):
        self.codes = iter(codes)
    def read(self):
        try:
            c = self.codes.next()
        except StopIteration:
            self.code = None
            return ''
        if c > 255:
            self.code = c
            return ''
        else:
            return chr(c)

def getkeys(stream, encoding):
    '''Given a CursesStream object and an encoding, yield the decoded
    unicode characters and special keycodes that curses sends'''
    read = codecs.getreader(encoding)(stream).read
    while True:
        c = read()
        if c:
            yield c
        elif stream.code is None:
            return
        else:
            yield stream.code


# Test getkeys with

for c in getkeys(Stream(codes), 'utf-8'):
    if isinstance(c, unicode):
        print 'Char\t', c
    else:
        print 'Code\t', c

-------------------- running uctest.py ------------------------------

marigold:junk arno$ python uctest.py 
Char	T
Char	?
Code	259
Char	?
Char	a

Thanks if you have read this far!

-- 
Arnaud


From arnodel at googlemail.com  Sat May 30 16:58:33 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 30 May 2009 21:58:33 +0100
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl>
Message-ID: <m2r5y61f5y.fsf@googlemail.com>

Piet van Oostrum <piet at cs.uu.nl> writes:

>>>>>> Aaron Brady <castironpi at gmail.com> (AB) wrote:
>
>>AB> I am writing a mapping object, and I want to ask about the details of
>>AB> __hash__ and __eq__.  IIUC if I understand correctly, the Python
>>AB> dict's keys' hash codes are looked up first in O( 1 ), then all the
>>AB> matching hash entries are compared on equality in O( n ).  That is,
>>AB> the hash code just really narrows down the search.  Am I correct?
>
> The O(1) part is correct. The O(n) is incorrect if n as usual is taken
> to be the number of keys in the dict. But it is true if n is the number
> of keys in the `bucket' that belongs to the hash value. The average
> complexity of looking up a key is O(1).

As all the keys could be in the same bucket, O(n) seems correct to me
(with n the total number of keys).

-- 
Arnaud


From arnodel at googlemail.com  Sat May 30 17:02:01 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 30 May 2009 22:02:01 +0100
Subject: decoding keyboard input when using curses
References: <m2vdni1fbc.fsf@googlemail.com>
Message-ID: <m2my8u1f06.fsf@googlemail.com>

Arnaud Delobelle <arnodel at googlemail.com> writes:
[...]
> I can pipe the stream of output from getch() directly through an
    ^^^ I mean *can't*

> instance of codecs.getreader('utf-8') because getch() sometimes returns
> the integer values of the 'special keys'.
[...]

I reread my post 3 times before sending it, honest!

-- 
Arnaud


From aahz at pythoncraft.com  Sat May 30 17:18:32 2009
From: aahz at pythoncraft.com (Aahz)
Date: 30 May 2009 14:18:32 -0700
Subject: scripting and uploading in Python
References: <3c1f0711-8da8-4610-bf8e-679eff0facf9@21g2000vbk.googlegroups.com>
Message-ID: <gvs7r8$qt$1@panix3.panix.com>

In article <3c1f0711-8da8-4610-bf8e-679eff0facf9 at 21g2000vbk.googlegroups.com>,
Mark Tarver  <dr.mtarver at ukonline.co.uk> wrote:
>
>Generally I'd like to bring myself up to speed on scripting in
>Python.   Any good reads - dead tree or otherwise?

Assuming you have any programming experience, start with the Python
tutorial:

http://docs.python.org/tutorial/index.html
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From aahz at pythoncraft.com  Sat May 30 17:22:57 2009
From: aahz at pythoncraft.com (Aahz)
Date: 30 May 2009 14:22:57 -0700
Subject: multiprocessing / forking memory usage
References: <mailman.771.1243360355.8015.python-list@python.org>
Message-ID: <gvs83h$5k8$1@panix3.panix.com>

In article <mailman.771.1243360355.8015.python-list at python.org>,
Randall Smith  <randall at tnr.cc> wrote:
>
>I'm trying to get a grasp on how memory usage is affected when forking 
>as the multiprocessing module does.  I've got a program with a parent 
>process using wx and other memory intensive modules. It spawns child 
>processes (by forking) that should be very lean (no wx required, etc). 
>Based on inspection using "ps v" and psutil, the memory usage (rss) is 
>much higher than I would expect for the subprocess.

One option if you're concerned about memory usage is to os.exec() another
program after forking, which will overlay the current process.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From dineshbvadhia at hotmail.com  Sat May 30 17:34:49 2009
From: dineshbvadhia at hotmail.com (dineshv)
Date: Sat, 30 May 2009 14:34:49 -0700 (PDT)
Subject: Python 2.6 for Windows 64-bit AMD
Message-ID: <e7b03ce3-1de4-46e4-995b-34f250f5e513@m17g2000vbi.googlegroups.com>

I upgraded from Python 2.5.4 to Python 2.6.2 under the Windows 64-bit
AMD version, but no external libraries (eg. pyparsing and Numpy 1.3)
work.  I noticed a few odd things:

i.  pyparsing could not find an entry for Python 2.6.2 in the Wondows
Registry
ii. Python 2.6.2 only allows per-machine installation instead of per-
user and per-machine.

Can anyone shed any light on what's up with this build of Python
2.6.2?

Dinesh


From jkv at unixcluster.dk  Sat May 30 17:37:50 2009
From: jkv at unixcluster.dk (jkv)
Date: Sat, 30 May 2009 23:37:50 +0200
Subject: Q: finding distance between 2 time's
In-Reply-To: <00cd89ce-cab2-42bf-8b91-0b147e6763e1@t21g2000yqi.googlegroups.com>
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>	<mailman.923.1243678617.8015.python-list@python.org>	<4a211df1$0$25199$ba624c82@nntp02.dk.telia.net>
	<00cd89ce-cab2-42bf-8b91-0b147e6763e1@t21g2000yqi.googlegroups.com>
Message-ID: <4A21A72E.5000607@unixcluster.dk>

martin at hvidberg.net wrote:
> Thanks both
>
> The first answer is quite instuctive, the other one might be the one
> I'll use in t
I didn't receive the other answer, could you please forward it to me?
> So 2x thanks.
You are welcome.

I took another look at your code, and you can compress it all to a if
"oneliner":
(and thanks to Steven for the <= reminder)

        if os.path.isfile(x):
            nSize = os.path.getsize(x)
            #if oneliner
            if time.mktime(time.localtime()) -
time.mktime(time.localtime(os.path.getmtime(x))) <= 3600:
              print ('HT fil -> %s %d @ %s') % (x, nSize, time.asctime)



From tjreedy at udel.edu  Sat May 30 18:29:10 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 30 May 2009 18:29:10 -0400
Subject: hash and __eq__
In-Reply-To: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
Message-ID: <gvsbvm$f9q$1@ger.gmane.org>

Aaron Brady wrote:
> I am writing a mapping object, and I want to ask about the details of
> __hash__ and __eq__.  IIUC if I understand correctly, the Python
> dict's keys' hash codes are looked up first in O( 1 ), then all the
> matching hash entries are compared on equality in O( n ).  That is,
> the hash code just really narrows down the search.  Am I correct?

Yes.  Even if your mapping object did a linear O(n) search with the hash 
value, only testing for equality after finding an equal hash value would 
be faster.  Your own mapping object can do whatever you want it to do 
internally, as long as it provides the appropriate interface.  You 
could, for instance, make a map that allowed unhashable lists, 
(unfrozen) sets, and dicts as heys by using len() as a surrogate for hash().

tjr



From tjreedy at udel.edu  Sat May 30 18:35:52 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 30 May 2009 18:35:52 -0400
Subject: IndexError: tuple index out of range
In-Reply-To: <4A2197FC.1020904@mrabarnett.plus.com>
References: <4f64bbf10905301311k57be0a73pc445bb2d74f71a2a@mail.gmail.com>
	<4A2197FC.1020904@mrabarnett.plus.com>
Message-ID: <gvscc7$gb0$1@ger.gmane.org>

MRAB wrote:
> Invert wrote:
>> My simple python script gives me an error when I try to execute it.  
>> Here is the error message:
>>
>>     daniel at ibex:~/Desktop/python$ python3 str_format2Daniel.py
>>     Traceback (most recent call last):
>>       File "str_format2Daniel.py", line 8, in <module>
>>         print ("{0} is {1} years old {3} and ".format(name, age, append))
>>     IndexError: tuple index out of range
>>     daniel at ibex:~/Desktop/python$
>>
>>
>> Here is my script:
>>
>>     #!/usr/bin/python
>>     # Filename: str_format2.py
>>
>>     age = 23
>>     name = 'Daniel'
>>     append = '6 months'
>>
>>     print ("{0} is {1} years old {3} and ".format(name, age, append))
> 
> That should be:
> 
>     print ("{0} is {1} years old {2} and ".format(name, age, append))

Actually
print ("{0} is {1} years old and {2}".format(name, age, append))

> 
>>     print ('{0} will be an elite python programmer in {2}.'.format(name,
>>     append))

And the latter should replace 2 with 1.

>> What am I doing wrong?

Using position indexes that are too large.  In Py3.1, .format will 
auto-number fields, so the print statements could be

print("{} is {} years old and {}".format(name, age, append))
print ('{} will be an elite python programmer in {}.'.format(name, append))

Terry Jan Reedy




From robert.kern at gmail.com  Sat May 30 18:40:16 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 30 May 2009 17:40:16 -0500
Subject: hash and __eq__
In-Reply-To: <gvsbvm$f9q$1@ger.gmane.org>
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<gvsbvm$f9q$1@ger.gmane.org>
Message-ID: <gvsckh$gvo$1@ger.gmane.org>

On 2009-05-30 17:29, Terry Reedy wrote:
> Aaron Brady wrote:
>> I am writing a mapping object, and I want to ask about the details of
>> __hash__ and __eq__. IIUC if I understand correctly, the Python
>> dict's keys' hash codes are looked up first in O( 1 ), then all the
>> matching hash entries are compared on equality in O( n ). That is,
>> the hash code just really narrows down the search. Am I correct?
>
> Yes. Even if your mapping object did a linear O(n) search with the hash
> value, only testing for equality after finding an equal hash value would
> be faster. Your own mapping object can do whatever you want it to do
> internally, as long as it provides the appropriate interface. You could,
> for instance, make a map that allowed unhashable lists, (unfrozen) sets,
> and dicts as heys by using len() as a surrogate for hash().

Only as long as you don't modify the length of those objects serving as keys in 
the meantime. But if you're careful about that, knock yourself out.

The important property to maintain is that if two keys compare equal to each 
other, then their hashes should equal each other. The reverse does not have to 
be true.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From martin at v.loewis.de  Sat May 30 18:41:26 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 31 May 2009 00:41:26 +0200
Subject: Python 2.6 for Windows 64-bit AMD
In-Reply-To: <e7b03ce3-1de4-46e4-995b-34f250f5e513@m17g2000vbi.googlegroups.com>
References: <e7b03ce3-1de4-46e4-995b-34f250f5e513@m17g2000vbi.googlegroups.com>
Message-ID: <4a21b616$0$20532$9b622d9e@news.freenet.de>

> Can anyone shed any light on what's up with this build of Python
> 2.6.2?

You probably tried to install the 32-bit version of PyParsing;
this cannot work with the 64-bit version of Python. You either
need to obtain a 64-bit version of pyparsing, or install the
32-bit version of Python.

HTH,
Martin


From tjreedy at udel.edu  Sat May 30 18:42:15 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 30 May 2009 18:42:15 -0400
Subject: Python 2.6 for Windows 64-bit AMD
In-Reply-To: <e7b03ce3-1de4-46e4-995b-34f250f5e513@m17g2000vbi.googlegroups.com>
References: <e7b03ce3-1de4-46e4-995b-34f250f5e513@m17g2000vbi.googlegroups.com>
Message-ID: <gvsco6$h9b$1@ger.gmane.org>

dineshv wrote:
> I upgraded from Python 2.5.4 to Python 2.6.2 under the Windows 64-bit
> AMD version, but no external libraries (eg. pyparsing and Numpy 1.3)
> work.  I noticed a few odd things:
> 
> i.  pyparsing could not find an entry for Python 2.6.2 in the Wondows
> Registry

I suspect that you did not make 2.6 the default installation, so it did 
not make the registry entry pyparsing was looking for.  If pyparsing has 
any compiled C, you need a binary compiled and linked for 2.6.

> ii. Python 2.6.2 only allows per-machine installation instead of per-
> user and per-machine.

I would not be surprised if per-user installation was dropped because of 
problems, especially with Vista.

> Can anyone shed any light on what's up with this build of Python
> 2.6.2?

Probably built by M.L.Loewis, who may chime in.

tjr




From piet at cs.uu.nl  Sat May 30 18:48:38 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 31 May 2009 00:48:38 +0200
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl> <m2r5y61f5y.fsf@googlemail.com>
Message-ID: <m2octacim1.fsf@cs.uu.nl>

>>>>> Arnaud Delobelle <arnodel at googlemail.com> (AD) wrote:

>AD> Piet van Oostrum <piet at cs.uu.nl> writes:
>>>>>>>> Aaron Brady <castironpi at gmail.com> (AB) wrote:
>>> 
>AB> I am writing a mapping object, and I want to ask about the details of
>AB> __hash__ and __eq__.  IIUC if I understand correctly, the Python
>AB> dict's keys' hash codes are looked up first in O( 1 ), then all the
>AB> matching hash entries are compared on equality in O( n ).  That is,
>AB> the hash code just really narrows down the search.  Am I correct?
>>> 
>>> The O(1) part is correct. The O(n) is incorrect if n as usual is taken
>>> to be the number of keys in the dict. But it is true if n is the number
>>> of keys in the `bucket' that belongs to the hash value. The average
>>> complexity of looking up a key is O(1).

>AD> As all the keys could be in the same bucket, O(n) seems correct to me
>AD> (with n the total number of keys).

For worst case only (mainly with a badly designed hash function). 
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From seattlehanks at yahoo.com  Sat May 30 19:01:06 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sat, 30 May 2009 16:01:06 -0700 (PDT)
Subject: Metaclass mystery
Message-ID: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>

I am experimenting with metaclasses, trying to figure out how things
are put together. At the moment I am baffled by the output of the
following code:

************************************
"""
Output is:

instance of metaclass MyMeta being created
(<class '__main__.MyMeta'>, <class '__main__.MyMeta'>)
instance of metaclass MyNewMeta being created
instance of metaclass MyMeta being created   <<<< Why this?
(<class '__main__.MyMeta'>, <class '__main__.MyNewMeta'>)

"""

class MyMeta(type):
    def __new__(meta, classname, bases, classDict):
        print 'instance of metaclass MyMeta being created'
        return type.__new__(meta, classname, bases, classDict)

class MyNewMeta(type):
    def __new__(meta, classname, bases, classDict):
        print 'instance of metaclass MyNewMeta being created'
        return type(classname, bases, classDict)

"""
Notice that a metaclass can be a factory function:
def f(classname, bases, classDict):
    return type(classname, bases, classDict)

class MyClass(object):
    __metaclass__ = f
"""

class MyClass(object):
    __metaclass__ = MyMeta

print (MyClass.__class__, MyClass.__metaclass__)

class MySubClass(MyClass):
    __metaclass__ = MyNewMeta

print (MySubClass.__class__, MySubClass.__metaclass__)
************************************
Honestly, I don't know why this line:
instance of metaclass MyMeta being created   <<<< Why this?
is being output when the MySubClass class object is instantiated.
MyNewMeta's __new__ method simply instantiates type directly (which I
know shouldn't be done, but I'm just experimenting and trying to
understand the code's output.)

I would really appreciate some ideas.


From gabriel at opensuse.org  Sat May 30 19:16:10 2009
From: gabriel at opensuse.org (Gabriel)
Date: Sat, 30 May 2009 20:16:10 -0300
Subject: how to find the last decorator of a chain
Message-ID: <4A21BE3A.1090608@opensuse.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Hi,

I have something like this:

@render(format="a")
@render(format="b")
@....
def view(format, data):
  return data

Each render will do something with 'data' if format match, and nothing
if not.

But if there is no more renders to eval, the last one is the default,
and must run even if the format doesn't match.

In my understanding this equivalent to:

render('a',
 render('b',
  view(***)))

Is there any way to know, in this case, that 'a' is the 'default' format?

PS: the number of renders could be 1 or more.

- --
Kind regards.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.9 (GNU/Linux)

iEYEAREIAAYFAkohvjoACgkQNHr4BkRe3pJZQgCgqxL7Qq7/vqDQMLkGQs5emWgH
nbMAn2vzY0xGjG2xhOkxAf8hmERc8R5r
=wWbB
-----END PGP SIGNATURE-----


From sjmachin at lexicon.net  Sat May 30 19:36:09 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 30 May 2009 16:36:09 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
Message-ID: <fa295d10-693d-4277-990a-6d4baff520b3@c9g2000yqm.googlegroups.com>

On May 30, 7:33?pm, mar... at hvidberg.net wrote:
> I made this little script (below) to look througt a dir to see if
> there are any files newer than .e.g. 1 hour.
> I have the loop through the dir working and can retreive file time as
> well as present time.
> both time variables are in the format returned by time.localtime()
>
> My question:
> How do I find the difference between such two time variables, to
> calculate the 'age' of the file?

http://en.wikipedia.org/wiki/Subtraction

This technique in well worth learning, as it can be applied in many
real-world situations, sometimes not even requiring a computer. For
example:

The letter was postmarked on the 18th of May; it was delivered on the
29th of May; how many days was it in transit? You give a $10 note for
an article priced at $6.35; how much change should you get?

HTH,
John


From benjamin at python.org  Sat May 30 19:45:53 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 30 May 2009 23:45:53 +0000 (UTC)
Subject: how to find the last decorator of a chain
References: <4A21BE3A.1090608@opensuse.org>
Message-ID: <loom.20090530T234452-982@post.gmane.org>

Gabriel <gabriel <at> opensuse.org> writes:

> In my understanding this equivalent to:
> 
> render('a',
>  render('b',
>   view(***)))
> 
> Is there any way to know, in this case, that 'a' is the 'default' format?

You could set an attribute on the function indicating the default.







From david at boddie.org.uk  Sat May 30 20:32:25 2009
From: david at boddie.org.uk (David Boddie)
Date: Sun, 31 May 2009 02:32:25 +0200
Subject: PyQt4 + WebKit
References: <c6ef05ee-ac66-4d5c-9fd5-6882b39a1daf@t10g2000vbg.googlegroups.com>
Message-ID: <gvsj6p$7na$1@get-news01.get.basefarm.net>

On Saturday 30 May 2009 17:39, dudekksoft at gmail.com wrote:

> I need to grab clicked links in QWebView. Everything is fine when I
> use linkClicked() signal. LinkDelegationPolicy is set to
> DelegateAllLinks and there is a problem. If some site has Javascript
> my procedure receives QUrl from linkClicked, next calls:
> 
> webView.setUrl(url) #Where "url" is received QUrl
> 
> Certainly this method doesn't work. Site loads again (in most cases
> it's called http://mywwwsite.net/#).

OK, so if I understand correctly, you don't know how to handle these
special links if you use a delegation policy, and you would prefer it
if they were handled by WebKit.

> As I use 
> QWebPage::DelegateExternalLinks it happens the same, because my
> procedure grabs links with Javascript. I don't know how to cope with
> this problem. Maybe it's possible to set own policy in
> QWebPage.LinkDelegationPolicy? Or maybe some other method to grab
> protocol, host(if external or not) when user clicks link in webView?

So, you only want to handle certain links, and pass on to WebKit those which
you can't handle? Is that correct?

David


From seattlehanks at yahoo.com  Sat May 30 20:32:33 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sat, 30 May 2009 17:32:33 -0700 (PDT)
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
Message-ID: <af1d0d42-0d62-4857-9e5c-6b18b7d79891@x3g2000yqa.googlegroups.com>

On May 30, 4:01?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> I am experimenting with metaclasses, trying to figure out how things
> are put together. At the moment I am baffled by the output of the
> following code:
>
> ************************************
> """
> Output is:
>
> instance of metaclass MyMeta being created
> (<class '__main__.MyMeta'>, <class '__main__.MyMeta'>)
> instance of metaclass MyNewMeta being created
> instance of metaclass MyMeta being created ? <<<< Why this?
> (<class '__main__.MyMeta'>, <class '__main__.MyNewMeta'>)
>
> """
>
> class MyMeta(type):
> ? ? def __new__(meta, classname, bases, classDict):
> ? ? ? ? print 'instance of metaclass MyMeta being created'
> ? ? ? ? return type.__new__(meta, classname, bases, classDict)
>
> class MyNewMeta(type):
> ? ? def __new__(meta, classname, bases, classDict):
> ? ? ? ? print 'instance of metaclass MyNewMeta being created'
> ? ? ? ? return type(classname, bases, classDict)
>
> """
> Notice that a metaclass can be a factory function:
> def f(classname, bases, classDict):
> ? ? return type(classname, bases, classDict)
>
> class MyClass(object):
> ? ? __metaclass__ = f
> """
>
> class MyClass(object):
> ? ? __metaclass__ = MyMeta
>
> print (MyClass.__class__, MyClass.__metaclass__)
>
> class MySubClass(MyClass):
> ? ? __metaclass__ = MyNewMeta
>
> print (MySubClass.__class__, MySubClass.__metaclass__)
> ************************************
> Honestly, I don't know why this line:
> instance of metaclass MyMeta being created ? <<<< Why this?
> is being output when the MySubClass class object is instantiated.
> MyNewMeta's __new__ method simply instantiates type directly (which I
> know shouldn't be done, but I'm just experimenting and trying to
> understand the code's output.)
>
> I would really appreciate some ideas.

This is my working theory:

return type(classname, bases, classDict), in MyNewMeta.__new__(),
actually calls type.__new__(type, classname, bases, classDict). I
think the magic happens in this method call. This method must look at
bases and notice that MySubClass extends MyClass, and that MyClass'
type is MyMeta, so instead of instantiating a 'type' object it decides
to instantiate a 'MyMeta' object, which accounts for the output.

Seriously, metaclasses are making my brain hurt. How do people like
Michele Simionato and David Mertz figure these things out? Does it all
come to looking at the C source code for the CPython interpreter?

Brain hurts, seriously.


From sjmachin at lexicon.net  Sat May 30 20:49:39 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 30 May 2009 17:49:39 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
	<4a211df1$0$25199$ba624c82@nntp02.dk.telia.net> 
	<00cd89ce-cab2-42bf-8b91-0b147e6763e1@t21g2000yqi.googlegroups.com> 
	<mailman.934.1243719478.8015.python-list@python.org>
Message-ID: <627c674d-a357-4c8e-98dc-127d9f87346d@g37g2000yqn.googlegroups.com>

On May 31, 7:37?am, jkv <j... at unixcluster.dk> wrote:
> mar... at hvidberg.net wrote:
> > Thanks both
>
> > The first answer is quite instuctive, the other one might be the one
> > I'll use in t
>
> I didn't receive the other answer, could you please forward it to me?> So 2x thanks.
>
> You are welcome.
>
> I took another look at your code, and you can compress it all to a if
> "oneliner":
> (and thanks to Steven for the <= reminder)
>
> ? ? ? ? if os.path.isfile(x):
> ? ? ? ? ? ? nSize = os.path.getsize(x)
> ? ? ? ? ? ? #if oneliner
> ? ? ? ? ? ? if time.mktime(time.localtime()) -
> time.mktime(time.localtime(os.path.getmtime(x))) <= 3600:
> ? ? ? ? ? ? ? print ('HT fil -> %s %d @ %s') % (x, nSize, time.asctime)

There is no virtue in onelinedness if the code is unclear and/or
incorrect.

Problems:
(1) Converting UTC time to local time and back again??

  > import time
  You are in a maze of twisty little functions, all alike.

So it can pay to do things a step at a time, and leave a note of your
intentions at each step.

(2) Consider grabbing the "current time" once instead of each for each
file

(3) asctime ... you are missing (an_argument)

import os, time, sys

def buildList(directory):
    listing = os.listdir(directory)
    now_utc_secs = time.time()
    for x in os.listdir(directory):
        x = os.path.join(directory, x)
        if os.path.isdir(x):
            print ('dir -> %s') % x
        elif os.path.isfile(x):
            mtime_utc_secs = os.path.getmtime(x)
            if now_utc_secs - mtime_utc_secs <= 3600.0:
                nSize = os.path.getsize(x)
                mtime_local_tuple = time.localtime(mtime_utc_secs)
                mtime_local_text = time.asctime(mtime_local_tuple)
                print ('fil -> %s %d @ %s') % (x, nSize,
mtime_local_text)

tstN = time.localtime()
print tstN
print "Time now: %s" % time.asctime(tstN)
buildList(sys.argv[1])

HTH,
John


From pavlovevidence at gmail.com  Sat May 30 21:15:30 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 30 May 2009 18:15:30 -0700 (PDT)
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<af1d0d42-0d62-4857-9e5c-6b18b7d79891@x3g2000yqa.googlegroups.com>
Message-ID: <cf7d562c-778c-4f06-a2ce-a58561dc0dfb@h2g2000yqg.googlegroups.com>

On May 30, 5:32?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> On May 30, 4:01?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
>
>
> > I am experimenting with metaclasses, trying to figure out how things
> > are put together. At the moment I am baffled by the output of the
> > following code:
>
> > ************************************
> > """
> > Output is:
>
> > instance of metaclass MyMeta being created
> > (<class '__main__.MyMeta'>, <class '__main__.MyMeta'>)
> > instance of metaclass MyNewMeta being created
> > instance of metaclass MyMeta being created ? <<<< Why this?
> > (<class '__main__.MyMeta'>, <class '__main__.MyNewMeta'>)
>
> > """
>
> > class MyMeta(type):
> > ? ? def __new__(meta, classname, bases, classDict):
> > ? ? ? ? print 'instance of metaclass MyMeta being created'
> > ? ? ? ? return type.__new__(meta, classname, bases, classDict)
>
> > class MyNewMeta(type):
> > ? ? def __new__(meta, classname, bases, classDict):
> > ? ? ? ? print 'instance of metaclass MyNewMeta being created'
> > ? ? ? ? return type(classname, bases, classDict)
>
> > """
> > Notice that a metaclass can be a factory function:
> > def f(classname, bases, classDict):
> > ? ? return type(classname, bases, classDict)
>
> > class MyClass(object):
> > ? ? __metaclass__ = f
> > """
>
> > class MyClass(object):
> > ? ? __metaclass__ = MyMeta
>
> > print (MyClass.__class__, MyClass.__metaclass__)
>
> > class MySubClass(MyClass):
> > ? ? __metaclass__ = MyNewMeta
>
> > print (MySubClass.__class__, MySubClass.__metaclass__)
> > ************************************
> > Honestly, I don't know why this line:
> > instance of metaclass MyMeta being created ? <<<< Why this?
> > is being output when the MySubClass class object is instantiated.
> > MyNewMeta's __new__ method simply instantiates type directly (which I
> > know shouldn't be done, but I'm just experimenting and trying to
> > understand the code's output.)
>
> > I would really appreciate some ideas.
>
> This is my working theory:
>
> return type(classname, bases, classDict), in MyNewMeta.__new__(),
> actually calls type.__new__(type, classname, bases, classDict). I
> think the magic happens in this method call. This method must look at
> bases and notice that MySubClass extends MyClass, and that MyClass'
> type is MyMeta, so instead of instantiating a 'type' object it decides
> to instantiate a 'MyMeta' object, which accounts for the output.

That's correct.  A type's metaclass has to be a not-necessarily proper
superclass of the all the bases' metaclasses.

Whenever possible type() will figure the most derived metaclass of all
the bases and use that as the metaclass, but sometimes it can't be
done.  Consider the following:


class AMeta(type):
    pass

class A(object):
    __metaclass__ = AMeta

class BMeta(type):
    pass

class B(object):
    __metaclass__ = BMeta

class C(A,B):
    pass  # this will raise exception

class CMeta(AMeta,BMeta):
    pass

class C(A,B):
    __metaclass__ = CMeta # this will work ok



> Seriously, metaclasses are making my brain hurt. How do people like
> Michele Simionato and David Mertz figure these things out? Does it all
> come to looking at the C source code for the CPython interpreter?
>
> Brain hurts, seriously.

I actually did rely on looking at the C source.  There's a surprising
amount of checking involving metaclass, layout, special methods, and
so on that is involved when creating a new type.


Carl Banks


From seattlehanks at yahoo.com  Sat May 30 21:37:13 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sat, 30 May 2009 18:37:13 -0700 (PDT)
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<af1d0d42-0d62-4857-9e5c-6b18b7d79891@x3g2000yqa.googlegroups.com> 
	<cf7d562c-778c-4f06-a2ce-a58561dc0dfb@h2g2000yqg.googlegroups.com>
Message-ID: <fdef7f4c-e7f2-4afa-aa72-6b1550d11c3d@f19g2000yqh.googlegroups.com>

On May 30, 6:15?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 30, 5:32?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
>
>
> > On May 30, 4:01?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
> > > I am experimenting with metaclasses, trying to figure out how things
> > > are put together. At the moment I am baffled by the output of the
> > > following code:
>
> > > ************************************
> > > """
> > > Output is:
>
> > > instance of metaclass MyMeta being created
> > > (<class '__main__.MyMeta'>, <class '__main__.MyMeta'>)
> > > instance of metaclass MyNewMeta being created
> > > instance of metaclass MyMeta being created ? <<<< Why this?
> > > (<class '__main__.MyMeta'>, <class '__main__.MyNewMeta'>)
>
> > > """
>
> > > class MyMeta(type):
> > > ? ? def __new__(meta, classname, bases, classDict):
> > > ? ? ? ? print 'instance of metaclass MyMeta being created'
> > > ? ? ? ? return type.__new__(meta, classname, bases, classDict)
>
> > > class MyNewMeta(type):
> > > ? ? def __new__(meta, classname, bases, classDict):
> > > ? ? ? ? print 'instance of metaclass MyNewMeta being created'
> > > ? ? ? ? return type(classname, bases, classDict)
>
> > > """
> > > Notice that a metaclass can be a factory function:
> > > def f(classname, bases, classDict):
> > > ? ? return type(classname, bases, classDict)
>
> > > class MyClass(object):
> > > ? ? __metaclass__ = f
> > > """
>
> > > class MyClass(object):
> > > ? ? __metaclass__ = MyMeta
>
> > > print (MyClass.__class__, MyClass.__metaclass__)
>
> > > class MySubClass(MyClass):
> > > ? ? __metaclass__ = MyNewMeta
>
> > > print (MySubClass.__class__, MySubClass.__metaclass__)
> > > ************************************
> > > Honestly, I don't know why this line:
> > > instance of metaclass MyMeta being created ? <<<< Why this?
> > > is being output when the MySubClass class object is instantiated.
> > > MyNewMeta's __new__ method simply instantiates type directly (which I
> > > know shouldn't be done, but I'm just experimenting and trying to
> > > understand the code's output.)
>
> > > I would really appreciate some ideas.
>
> > This is my working theory:
>
> > return type(classname, bases, classDict), in MyNewMeta.__new__(),
> > actually calls type.__new__(type, classname, bases, classDict). I
> > think the magic happens in this method call. This method must look at
> > bases and notice that MySubClass extends MyClass, and that MyClass'
> > type is MyMeta, so instead of instantiating a 'type' object it decides
> > to instantiate a 'MyMeta' object, which accounts for the output.
>
> That's correct. ?A type's metaclass has to be a not-necessarily proper
> superclass of the all the bases' metaclasses.
>
> Whenever possible type() will figure the most derived metaclass of all
> the bases and use that as the metaclass, but sometimes it can't be
> done. ?Consider the following:
>
> class AMeta(type):
> ? ? pass
>
> class A(object):
> ? ? __metaclass__ = AMeta
>
> class BMeta(type):
> ? ? pass
>
> class B(object):
> ? ? __metaclass__ = BMeta
>
> class C(A,B):
> ? ? pass ?# this will raise exception
>
> class CMeta(AMeta,BMeta):
> ? ? pass
>
> class C(A,B):
> ? ? __metaclass__ = CMeta # this will work ok
>
> > Seriously, metaclasses are making my brain hurt. How do people like
> > Michele Simionato and David Mertz figure these things out? Does it all
> > come to looking at the C source code for the CPython interpreter?
>
> > Brain hurts, seriously.
>
> I actually did rely on looking at the C source. ?There's a surprising
> amount of checking involving metaclass, layout, special methods, and
> so on that is involved when creating a new type.
>
> Carl Banks

Thanks a lot, Carl. It's funny that you would post that example, as
just 15 minutes ago I wrote almost the exact same code in my testing:

class XMeta(type):
    pass

class YMeta(type):
    pass

class X(object):
    __metaclass__ = XMeta

class Y(object):
    __metaclass__ = YMeta

"""
This causes an error, since there is no leafmost metaclass in the set
{XMeta, YMeta}:

class Z(X, Y):
    pass
"""

"""
The way to solve this is to create a common derived metaclass and use
that
one for class z:
"""

class ZMeta(XMeta, YMeta):
    pass

class Z(X, Y):
    __metaclass__ = ZMeta

Looking at the C code sounds like a daunting task, but I might take a
plunge and give it a try, since it seems that guessing via
experimental results is not the most optimal way to go about it.

Thank you again.


From nkamado at gmail.com  Sat May 30 21:42:46 2009
From: nkamado at gmail.com (=?ISO-2022-JP?B?GyRCM3lFWjUtTkkbKEI=?=)
Date: Sun, 31 May 2009 10:42:46 +0900
Subject: Release PyInstaller exe installer using distutils for windows.
Message-ID: <4A21E096.1060405@gmail.com>

I created pyInstaller exe installer using distutils only for windows and
upload onto the following URL.
It makes you to build windows executable file with setup.py's setup
function.
Setup function is unmounted function on original pyInstaller package,
and this installer enables UPX exe archive functions as default.

http://moco.sakura.ne.jp/wp-content/uploads/2009/05/pyinstaller-13win32.exe

If you want to use this package,
Please write following code on setup.py.

from pyInstaller import *
setup('testre.py',onefile=True,name='test')


Thank you.

// kr2: nkamado at gmail.com



From ldo at geek-central.gen.new_zealand  Sat May 30 22:11:34 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 31 May 2009 14:11:34 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com>
	<mailman.858.1243549462.8015.python-list@python.org>
	<woNTl.14450$y61.392@news-server.bigpond.net.au>
Message-ID: <gvsp0m$fn1$5@lust.ihug.co.nz>

In message <woNTl.14450$y61.392 at news-server.bigpond.net.au>, Lie Ryan wrote:

> norseman wrote:
>
>> Suggestion:
>> Take a look at the top two most used OS you use and learn the default
>> (most often available) text editors that come with them.
> 
> Which means Notepad on Windows?

Or you could take a Linux preinstallation on a Live CD/DVD or USB stick. 
There's no Windows system so brain-dead it can't be fixed with a simple 
ctrl-alt-del. :)



From ldo at geek-central.gen.new_zealand  Sat May 30 22:15:12 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 31 May 2009 14:15:12 +1200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
	<gvkoep$oii$3@lust.ihug.co.nz>
	<0dcfcb4a-8844-420b-b2e2-c8e68419774d@p6g2000pre.googlegroups.com>
	<gvq2h9$sos$3@lust.ihug.co.nz>
	<55520c08-5b02-4231-b0f3-74eadecd6fd7@g1g2000yqh.googlegroups.com>
Message-ID: <gvsp7g$fn1$6@lust.ihug.co.nz>

In message <55520c08-5b02-4231-
b0f3-74eadecd6fd7 at g1g2000yqh.googlegroups.com>, John Machin wrote:

> ... suggest a better way.

<http://codecodex.com/wiki/index.php?title=Useful_MySQL_Routines#Quoting>



From Jebel.Star at gmail.com  Sat May 30 22:28:23 2009
From: Jebel.Star at gmail.com (Jebel)
Date: Sat, 30 May 2009 19:28:23 -0700 (PDT)
Subject: (windows) How to get information as string from a GreenHills project?
Message-ID: <a84b8eba-5082-4d9a-ab75-38d1466a2eee@s12g2000yqi.googlegroups.com>

I use python to start a GreenHills project in command line. And the
GreenHills project create a string which is include the information
that needed to be analyzed. How Can I return this string from
GreenHills project to python?

Thanks a lot.



From goldwamh at slu.edu  Sun May 31 01:27:26 2009
From: goldwamh at slu.edu (Michael H. Goldwasser)
Date: Sun, 31 May 2009 00:27:26 -0500
Subject: Challenge supporting custom deepcopy with inheritance
Message-ID: <18978.5438.755496.633709@Michael-Goldwassers-Computer.local>


I've been playing around recently with customizing the deepcopy
semantics within an inheritance hierarchy, and run across the
following hurdle.

Assume that class B inherits from class A, and that class A has
legitimately customized its deepcopy semantics (but in a way that is
not known to class B).  If we want a deepcopy of B to be defined so
that relevant state inherited from A is copied as would be done for
class A, and with B able to control how to deepcopy the extra state
that it introduces.  I cannot immediately find a general way to
properly implement the deepcopy of B.

To make the discussion tangible, I include an outrageously artificial
example in the code fragment below.  In this code, class A implements
__deepcopy__ to intentionally create a clone that has a reversed
version of a list instance.  The beginning of the main test
demonstrates that an instance of A can successfully be cloned with this
semantics.  But the attempt to deepcopy an instance of B fails (the
current failure is because B has not implemented __deepcopy__ and the
inherited version of A.__deepcopy__ assumes the wrong constructor
signature).

The question is how class B should defined so that its instances can
"inherit" this deepcopy semantic.  Ideally, I'd like to find a recipe
for class B that works regardless of how A accomplishes its semantics.
That is, I can find ways to rewrite A to be more supportive of B's
goal, but I'd like to know if there is a general solution that could
be used if the author of B doesn't have control over A's
implementation.

Here are some initial thoughts:

 * I'm only concerned with single inheritance (thankfully)

 * If A had relied on use of __getstate__ and __setstate__ to affect
   the desired change, then the inheritance works as desired.  But I
   have an application where I want to leave the default pickling
   behavior alone, and only to change what happens with clones.

 * If we did not use inheritance, but instead had a class B that had
   an A instance in its state, this is easy. We would call deepcopy
   on the A instance to get an acceptable copy of that instance for
   the new B.  But in the example below, we insist on B being a
   subtype of A.

 * If A.__deepcopy__ had started
            dup = A(self.__aTag)
   rather than
            dup = self.__class__(self.__aTag)

   then the following perverse approach for B.__deepcopy__ succeeds:

        def __deepcopy__(self, memo={}):
            tempBTag = self.__bTag
            tempBList = self.__bList
            del self.__bTag     # hide these attributes to avoid risk
            del self.__bList    # that they affect A.__deepcopy__
            dupA = A.__deepcopy__(self, memo)
            self.__bTag = tempBTag
            self.__bList = tempBList
            dup = B.__new__(B)
            memo[id(self)] = dup
            dup.__dict__ = dupA.__dict__
            dup.__bTag = copy.deepcopy(self.__bTag, memo)
            dup.__bList = copy.deepcopy(self.__bList, memo)
            return dup

    but this again presumes that we have some control over the
    strategy employed by class A, it relies on the fact that
    A.__deepcopy__ succeeded when the first parameter was actually an
    instance of class B rather than class A, and it seems like a
    perverse strategy on the whole, even if it does succeed on this
    example.  Also, there could be a flaw n that dupA may recursively
    have included a reference back to that instance, yet we'd need
    such a reference to be to dup not dupA in the end.

I'm hoping that I've just missed a cleaner way to do this.
I welcome any comments, discussion, or suggestions.

With regard,
Michael

-----------------------------------------------------------
import copy

class A(object):
    def __init__(self, aTag):
        self.__aTag = aTag
        self.__aList = []

    def addA(self, val):
        self.__aList.append(val)

    def __repr__(self):
        return (
            "aTag: " + self.__aTag +
            "\naList ("+str(id(self.__aList))+"): " + repr(self.__aList)
            )

    def __deepcopy__(self, memo={}):
        dup = self.__class__(self.__aTag)
        memo[id(self)] = dup
        dup.__aList = copy.deepcopy(self.__aList, memo)
        dup.__aList.reverse()
        return dup

class B(A):
    def __init__(self, aTag, bTag):
        A.__init__(self, aTag)
        self.__bTag = bTag
        self.__bList = []

    def addB(self, val):
        self.__bList.append(val)

    def __repr__(self):
        return (
            A.__repr__(self) +
            "\nbTag: " + self.__bTag +
            "\nbList ("+str(id(self.__bList))+"): " + repr(self.__bList)
            )

    #  How can B support a deepcopy that provides deepcopy of bTag and
    #  bList while getting the semantics of A's deepcopy for
    #  attributes defined by A?


if __name__ == '__main__':
    print "Test of class A\n==============="
    foo = A('alice')
    foo.addA(1)
    foo.addA(2)

    bar = copy.deepcopy(foo)

    print "\nOriginal Foo:"
    print foo
    print "\nOriginal (deepcopy) Bar:"
    print bar

    bar.addA(0)

    print "\n(mutated) Bar:"
    print bar
    print "Original Foo:"
    print foo

    print "Test of class B\n==============="
    foo = B('alice', 'bob')
    foo.addA(1)
    foo.addA(2)
    foo.addB('hello')
    foo.addB('goodbye')

    bar = copy.deepcopy(foo)     #  crashes

    print "\nOriginal Foo:"
    print foo
    print "\nOriginal (deepcopy) Bar:"
    print bar

    bar.addA(0)
    bar.addB('adios')

    print "\n(mutated) Bar:"
    print bar
    print "Original Foo:"
    print foo
-----------------------------------------------------------


From cameron.pulsford at gmail.com  Sun May 31 01:58:15 2009
From: cameron.pulsford at gmail.com (Cameron Pulsford)
Date: Sun, 31 May 2009 01:58:15 -0400
Subject: Have a variable column length in printf
Message-ID: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>

Hello all, I'm trying to pretty print a list, so I am doing something like
print '%3d' % integer

only I would like that 3 to be a variable, instead of hardcoded. Is this
possible, or are there any other ways to accomplish this? Thanks!
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From cjns1989 at gmail.com  Sun May 31 02:22:20 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Sun, 31 May 2009 02:22:20 -0400
Subject: decoding keyboard input when using curses
In-Reply-To: <m2vdni1fbc.fsf@googlemail.com>
References: <m2vdni1fbc.fsf@googlemail.com>
Message-ID: <20090531062220.GA2451@turki.gavron.org>

On Sat, May 30, 2009 at 04:55:19PM EDT, Arnaud Delobelle wrote:

> Hi all,

Disclaimer: I am not familiar with the curses python implementation and
I'm neither an ncurses nor a "unicode" expert by a long shot.

:-)

> I am looking for advice on how to use unicode with curses.  First I will
> explain my understanding of how curses deals with keyboard input and how
> it differs with what I would like.
> 
> The curses module has a window.getch() function to capture keyboard
> input.  This function returns an integer which is more or less:
> 
> * a byte if the key which was pressed is a printable character (e.g. a,
>   F, &);
> 
> * an integer > 255 if it is a special key, e.g. if you press KEY_UP it
>   returns 259.

The getch(3NCURSES) function returns an integer. Provide it's large
enough to accomodate the highest possible value, the actual size in
bytes of the integer should be irrelevant.

> As far as I know, curses is totally unicode unaware, 

My impression is that rather than "unicode unaware", it is "unicode
transparent" - or (nitpicking) "UTF8 transparent" - since I'm not sure
other flavors of unicode are supported.

> so if the key pressed is printable but not ASCII, 

.. nitpicking again, but ASCII is a 7-bit encoding: 0-127.

> the getch() function will return one or more bytes depending on the
> encoding in the terminal.

I don't know about the python implementation, but my guess is that it
should closely follow the underlying ncurses API - so the above is
basically correct, although it's not a question of the number of bytes
but rather the returned range of integers - if your locale is en.US then
that should be 0-255.. if it is en_US.utf8 the range is considerably
larger.

> E.g. given utf-8 encoding, if I press the key '?' on my keyboard (which
> encoded as '\xc3\xa9' in utf-8), I will need two calls to getch() to get
> this: the first one will return 0xC3 and the second one 0xA9.

No. A single call to getch() will grab your " ?" and return 0xc3a9,
decimal 50089.

> Instead of getting a stream of bytes and special keycodes (with value >
> 255) from getch(), what I want is a stream of *unicode characters* and
> special keycodes.

This is what getch(3NCURSES) does: it returns the integer value of one
"unicode character".

Likewise, I would assume that looping over the python equivalent of
getch() will not return a stream of bytes but rather a "stream" of
integers that map one to one to the "unicode characters" that were
entered at the terminal.

Note: I am only familiar with languages such as English, Spanish,
French, etc. where only one terminal cell is used for each glyph. My
understanding is that things get somewhat more complicated with
languages that require so-called "wide characters" - two terminal cells
per character, but that's a different issue.

> So, still assuming utf-8 encoding in the terminal, if I type:
> 
>     T?[KEY_UP]?a
> 
> iterating call to the getch() function will give me this sequence of
> integers:
> 
>     84, 195, 169, 259,   195, 167, 97
>     T-  ?-------  KEY_UP ?-------  a-
> 
> But what I want to get this stream instead:
> 
>     u'T', u'?', 259, u'?', u'a'

No, for the above, getch() will return:

     84, 50089, 259, 50087, 97

.. which is "functionally" equivalent to:

     u'T', u'?', 259, u'?', u'a'

[..]

So shouldn't this issue boil down to just a matter of casting the
integers to the "u" data type?

This short snippet may help clarify the above:

-----------------------------------------------------------------------
#include <locale.h>
#include <ncurses.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

int unichar;

int main(int argc, char *argv[])
{
  setlocale(LC_ALL, "en_US.UTF.8");        /* make sure UTF8       */
  initscr();                               /* start curses mode    */
  raw();
  keypad(stdscr, TRUE);                    /* pass special keys    */
  unichar = getch();                       /* read terminal        */

  mvprintw(24, 0, "Key pressed is = %4x ", unichar);

  refresh();
  getch();                                 /* wait                 */
  endwin();                                /* leave curses mode    */
  return 0;
}
-----------------------------------------------------------------------

Hopefully you have access to a C compiler:

$ gcc -lncurses uni00.c -o uni00

Hope this helps... Whatever the case, please keep me posted.

CJ


From arnodel at googlemail.com  Sun May 31 02:24:09 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 31 May 2009 07:24:09 +0100
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl> <m2r5y61f5y.fsf@googlemail.com>
	<m2octacim1.fsf@cs.uu.nl>
Message-ID: <m2iqjh23jq.fsf@googlemail.com>

Piet van Oostrum <piet at cs.uu.nl> writes:

>>>>>> Arnaud Delobelle <arnodel at googlemail.com> (AD) wrote:
>
>>AD> Piet van Oostrum <piet at cs.uu.nl> writes:
>>>>>>>>> Aaron Brady <castironpi at gmail.com> (AB) wrote:
>>>> 
>>AB> I am writing a mapping object, and I want to ask about the details of
>>AB> __hash__ and __eq__.  IIUC if I understand correctly, the Python
>>AB> dict's keys' hash codes are looked up first in O( 1 ), then all the
>>AB> matching hash entries are compared on equality in O( n ).  That is,
>>AB> the hash code just really narrows down the search.  Am I correct?
>>>> 
>>>> The O(1) part is correct. The O(n) is incorrect if n as usual is taken
>>>> to be the number of keys in the dict. But it is true if n is the number
>>>> of keys in the `bucket' that belongs to the hash value. The average
>>>> complexity of looking up a key is O(1).
>
>>AD> As all the keys could be in the same bucket, O(n) seems correct to me
>>AD> (with n the total number of keys).
>
> For worst case only (mainly with a badly designed hash function). 

... or a cleverly designed data set!

AFAIK, 'complexity' means 'worst case complexity' unless otherwise
stated.

-- 
Arnaud


From emile at fenx.com  Sun May 31 03:03:21 2009
From: emile at fenx.com (Emile van Sebille)
Date: Sun, 31 May 2009 00:03:21 -0700
Subject: Have a variable column length in printf
In-Reply-To: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
References: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
Message-ID: <gvta7s$35b$1@ger.gmane.org>

On 5/30/2009 10:58 PM Cameron Pulsford said...
> Hello all, I'm trying to pretty print a list, so I am doing something like
> 
> print '%3d' % integer
> 
> only I would like that 3 to be a variable, instead of hardcoded. Is this 
> possible, or are there any other ways to accomplish this? Thanks!
> 

 >>> integer = 12
 >>> for lenvar in (4,5,6,7):
...     print ("%%%sd" % lenvar) % integer
...
   12
    12
     12
      12
 >>>


Emile



From smukh at cognobytes.com  Sun May 31 03:06:48 2009
From: smukh at cognobytes.com (Sumitava Mukherjee)
Date: Sun, 31 May 2009 00:06:48 -0700 (PDT)
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<c9566044-6e50-42ca-aa02-9ff63206c601@g22g2000pra.googlegroups.com> 
	<m2zlcz1ykl.fsf@googlemail.com>
	<slrnh1sr7v.fef.apardon@rcpc42.vub.ac.be>
Message-ID: <e131cf51-516c-4d1d-bfe3-5c060af73d2d@h28g2000yqd.googlegroups.com>

On May 28, 3:52?pm, Antoon Pardon <apar... at forel.vub.ac.be> wrote:
> Op 2009-05-26, Arnaud Delobelle schreef <arno... at googlemail.com>:
>
>
>
> > Sumitava Mukherjee <sm... at cognobytes.com> writes:
>
> >> On May 26, 11:39?pm, Sumitava Mukherjee <sm... at cognobytes.com> wrote:
> >>> Hi all,
> >>> I need to randomly sample from a list where all choices have weights
> >>> attached to them. The probability of them being choosen is dependent
> >>> on the weights.
> >>> If say Sample list of choices are [A,B,C,D,E] and weights of the same
> >>> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
> >>> want the likeliness of them being chosen be in the order : D>A>C>E>B
>
> > You mean A > D > C > E > B
>
> >>> In short I mean if prob of a H is .9 and probability of T be 0.1 then
> >>> if I draw 10 samples, 9 should be H and 1 should be T.
>
> >>> I coudn't find a function in the module random that does so.
> >>> Please can someone guide me how the above could be implemented [either
> >>> through some function which exists and I don't know or pointers to
> >>> some code snippets which does so]?
>
> >>>>>> [Oh, I forgot to mention. I am looking for sampling without replacement.]
>
> > If you do sampling without replacement, you need to know the exact
> > number of each of A, B, C, D, E in the sample, not just their relative
> > frequency.
>
> As far as I understand, you are given the exact number of each. It is one.
> The numbers given are not relative frequencies of appearance but weights
> to be attributed for picking them.
>
> --
> Antoon Pardon

Yes, the numbers are weights attributed for picking them.


From smukh at cognobytes.com  Sun May 31 03:08:44 2009
From: smukh at cognobytes.com (Sumitava Mukherjee)
Date: Sun, 31 May 2009 00:08:44 -0700 (PDT)
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<uIadnZ8appu3y4DXnZ2dnUVZ_radnZ2d@pdx.net>
Message-ID: <a380edb3-77f6-4e0d-bccd-2bff92b7cb1b@k2g2000yql.googlegroups.com>

On May 27, 8:08?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> Sumitava Mukherjee wrote:
> > I need to randomly sample from a list where all choices have weights
> > attached to them. The probability of them being choosen is dependent
> > on the weights.
>
> I am not sure why everybody is normalizing by dividing the weights.
> This isa possibility (I had fun writing it).
>
> def sample_without_replacement(choices, weights):
> ? ? ?'''Yield elements sampled w/o replacement by weighting'''
> ? ? ?if len(weights) != len(choices):
> ? ? ? ? ?raise ValueError('%d choices, but %d weights?' % (
> ? ? ? ? ? ? ?len(choices), len(weights)))
> ? ? ?if min(weights) < 0:
> ? ? ? ? ?raise ValueError('Negative weights?: %s' % (
> ? ? ? ? ? ? ? ? ? ? ?[(i, w) for i, w in enumerate(weights) if w < 0]))
>
> ? ? ?# look at only non-zero probabilities
> ? ? ?combined = [(w, v) for w, v in zip(weights, choices) if w > 0]
>
> ? ? ?# Go from highest probability down to reduce expected traversal
> ? ? ?combined.sort(key=operator.itemgetter(0), reverse=True)
>
> ? ? ?total = sum(w for w, v in combined) # sum(weights) also works
> ? ? ?while combined:
> ? ? ? ? ?spot = sample = random.random() * total
> ? ? ? ? ?for n, (weight, choice) in enumerate(combined):
> ? ? ? ? ? ? ?spot -= weight
> ? ? ? ? ? ? ?if spot <= 0:
> ? ? ? ? ? ? ? ? ?break
> ? ? ? ? ?else:
> ? ? ? ? ? ? ?# n, (weight, choice) = 0, combined[0] # Highest probability
> ? ? ? ? ? ? ?raise ValueError('%f left after choosing %f/%f?: %s' % (
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?spot, sample, total, combined))
> ? ? ? ? ?yield choice
> ? ? ? ? ?total -= weight
> ? ? ? ? ?if weight > total * 256: # arbitrary choice for recalculation
> ? ? ? ? ? ? ?# precision affected, rebuild
> ? ? ? ? ? ? ?total = sum(w for w, v in combined)
> ? ? ? ? ?del combined[n]
> ? ? ?raise ValueError('Samplng more than %d without replacement?' % (
> ? ? ? ? ? ? ? ? ? ? ? ?sum(1 for w in weights if w > 0)))
>
> for n in range(10):
> ? ? ?gen = sample_without_replacement('abcdef', [32,16,8,4,2,1])
> ? ? ?print gen.next(), gen.next(), gen.next()
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

Among all the help (all of which I really appreciate), I found your
solution closest to what I was expecting. Thanks a lot Scott.


From arnodel at googlemail.com  Sun May 31 03:19:09 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 31 May 2009 08:19:09 +0100
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<af1d0d42-0d62-4857-9e5c-6b18b7d79891@x3g2000yqa.googlegroups.com>
	<cf7d562c-778c-4f06-a2ce-a58561dc0dfb@h2g2000yqg.googlegroups.com>
	<fdef7f4c-e7f2-4afa-aa72-6b1550d11c3d@f19g2000yqh.googlegroups.com>
Message-ID: <m2eiu52102.fsf@googlemail.com>

LittleGrasshopper <seattlehanks at yahoo.com> writes:

> On May 30, 6:15?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>> On May 30, 5:32?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>>
>>
>>
>> > On May 30, 4:01?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>>
>> > > I am experimenting with metaclasses, trying to figure out how things
>> > > are put together.

Have you read Guido's 'Unifying types and classes in Python 2.2' [1]?  I
read it a long time ago but I remember it being very enlightening.

[1] http://www.python.org/download/releases/2.2.3/descrintro/

-- 
Arnaud


From gherron at islandtraining.com  Sun May 31 03:21:37 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Sun, 31 May 2009 00:21:37 -0700
Subject: Have a variable column length in printf
In-Reply-To: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
References: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
Message-ID: <4A223001.5010809@islandtraining.com>

Cameron Pulsford wrote:
> Hello all, I'm trying to pretty print a list, so I am doing something 
> like
>
> print '%3d' % integer
>
> only I would like that 3 to be a variable, instead of hardcoded. Is 
> this possible, or are there any other ways to accomplish this? Thanks!

Use a '*' instead of fixed width, and then supply the actual width as a 
separate parameter:

 >>> print '%*d' % (5,123)
  123

Gary Herron




From steve at REMOVE-THIS-cybersource.com.au  Sun May 31 03:34:39 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 31 May 2009 07:34:39 GMT
Subject: Have a variable column length in printf
References: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
	<mailman.946.1243754501.8015.python-list@python.org>
Message-ID: <003e0d92$0$9723$c3e8da3@news.astraweb.com>

Apologies for breaking threading, the original post to this thread is not 
on my newserver.


Cameron Pulsford wrote:

> Hello all, I'm trying to pretty print a list, so I am doing something
> like
>
> print '%3d' % integer


Instead of re-inventing the wheel, have you looked at the pretty-print 
module? import pprint may do what you want.

If you still need your own custom pretty-print function, then there are a 
couple of ways to accomplish what you ask:

>> only I would like that 3 to be a variable, instead of hardcoded. Is
>> this possible, or are there any other ways to accomplish this?

As others have said, you can use '*' instead of the width. Another 
alternative, for even more flexibility, is to construct the format string 
programmatically:


>>> fmt = '%%0%dd' % 7
>>> print fmt % 3
0000003



-- 
Steven


From michele.petrazz at REMOTEME_unipex.it  Sun May 31 03:51:53 2009
From: michele.petrazz at REMOTEME_unipex.it (Michele Petrazzo)
Date: Sun, 31 May 2009 09:51:53 +0200
Subject: try except inside exec
In-Reply-To: <mailman.899.1243615820.8015.python-list@python.org>
References: <gvor0g$679$1@nnrp-beta.newsland.it>	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>	<gvp0gn$9qh$1@nnrp-beta.newsland.it>
	<mailman.899.1243615820.8015.python-list@python.org>
Message-ID: <gvtcup$mkc$1@nnrp-beta.newsland.it>

Emile van Sebille wrote:
> Write the string out to a .py file and import it?
> 

I don't think that it's possible. I want to create an env that are
accessible only from that peace of code and not from the code that
"execute" the third-party one.

> Emile
> 

Michele


From michele.petrazz at REMOTEME_unipex.it  Sun May 31 03:54:27 2009
From: michele.petrazz at REMOTEME_unipex.it (Michele Petrazzo)
Date: Sun, 31 May 2009 09:54:27 +0200
Subject: try except inside exec
In-Reply-To: <mailman.900.1243616869.8015.python-list@python.org>
References: <gvor0g$679$1@nnrp-beta.newsland.it>	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>	<gvp0gn$9qh$1@nnrp-beta.newsland.it>
	<mailman.900.1243616869.8015.python-list@python.org>
Message-ID: <gvtd3i$mkc$2@nnrp-beta.newsland.it>

David Stanek wrote:
> Is the thirdparty function the entire STR or just the a_funct part?
> 

Just the a_funct. Only for try and for see if it's possible to catch all
the (possible) exception(s), I add the "try/except" clause that include
the a_funct external code.

Michele


From ldo at geek-central.gen.new_zealand  Sun May 31 04:00:22 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 31 May 2009 20:00:22 +1200
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
	<gvlppt$hk0$1@news.lysator.liu.se> <gvmudo$25d$2@lust.ihug.co.nz>
	<gvqh4p$obn$1@news.lysator.liu.se>
Message-ID: <gvtdem$rk7$2@lust.ihug.co.nz>

In message <gvqh4p$obn$1 at news.lysator.liu.se>, Thomas Bellman wrote:

> We weren't exactly keen on rebooting the machine, but it was the
> fastest way of getting out of that situation that we could figure
> out.  How *should* we have dealt with it in your opinion?

Remember, the timed_wait timeout is there for a reason, and trying to defeat 
it could reduce the reliability of your application--that's why cutting 
corners is a bad idea.

If you want to minimize the effect of the timeout, then just use different 
ports, and have the clients find them via DNS SRV records.



From steve at REMOVE-THIS-cybersource.com.au  Sun May 31 04:04:30 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 31 May 2009 08:04:30 GMT
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl> <m2r5y61f5y.fsf@googlemail.com>
	<m2octacim1.fsf@cs.uu.nl> <m2iqjh23jq.fsf@googlemail.com>
Message-ID: <003e1491$0$9723$c3e8da3@news.astraweb.com>

On Sun, 31 May 2009 07:24:09 +0100, Arnaud Delobelle wrote:

> AFAIK, 'complexity' means 'worst case complexity' unless otherwise
> stated.

No, it means "average or typical case" unless otherwise specified. 
Consult almost any comp sci text book and you'll see hash tables with 
chaining (like Python dicts) described as O(1) rather than O(N), 
Quicksort as O(N log N) instead of O(N**2), and similar. If the default 
was "worst case unless otherwise specified", then Quicksort would be 
called "Slower than Bubblesort Sort".

(Both are O(N**2), but Quicksort does more work.)

Here's a quote on-line:

"You should be clear about which cases big-oh notation describes. By 
default it usually refers to the average case, using random data. 
However, the characteristics for best, worst, and average cases can be 
very different..."

http://leepoint.net/notes-java/algorithms/big-oh/bigoh.html


It is simply misleading to describe dicts as O(N) without the 
qualification "if the data is chosen maliciously, or otherwise by an 
incredible fluke". And even if it isn't, Piet explicitly said he was 
talking about the average behaviour, not worst.



-- 
Steven


From arnodel at googlemail.com  Sun May 31 04:05:20 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 31 May 2009 09:05:20 +0100
Subject: decoding keyboard input when using curses
References: <m2vdni1fbc.fsf@googlemail.com>
	<mailman.944.1243750942.8015.python-list@python.org>
Message-ID: <m2ab4t1yv3.fsf@googlemail.com>

Chris Jones <cjns1989 at gmail.com> writes:

Hi Chris, thanks for your detailed reply.

> On Sat, May 30, 2009 at 04:55:19PM EDT, Arnaud Delobelle wrote:
>
>> Hi all,
>
> Disclaimer: I am not familiar with the curses python implementation and
> I'm neither an ncurses nor a "unicode" expert by a long shot.
>
> :-)
>
>> I am looking for advice on how to use unicode with curses.  First I will
>> explain my understanding of how curses deals with keyboard input and how
>> it differs with what I would like.
>> 
>> The curses module has a window.getch() function to capture keyboard
>> input.  This function returns an integer which is more or less:
>> 
>> * a byte if the key which was pressed is a printable character (e.g. a,
>>   F, &);
>> 
>> * an integer > 255 if it is a special key, e.g. if you press KEY_UP it
>>   returns 259.
>
> The getch(3NCURSES) function returns an integer. Provide it's large
> enough to accomodate the highest possible value, the actual size in
> bytes of the integer should be irrelevant.

Sorry I was somehow mixing up what happens in general and what happens
with utf-8 (probably because I have only done test with utf-8), where
the number of bytes used to encode a character varies.

>> As far as I know, curses is totally unicode unaware, 
>
> My impression is that rather than "unicode unaware", it is "unicode
> transparent" - or (nitpicking) "UTF8 transparent" - since I'm not sure
> other flavors of unicode are supported.

>> so if the key pressed is printable but not ASCII, 
>
> .. nitpicking again, but ASCII is a 7-bit encoding: 0-127.
>
>> the getch() function will return one or more bytes depending on the
>> encoding in the terminal.
>
> I don't know about the python implementation, but my guess is that it
> should closely follow the underlying ncurses API - so the above is
> basically correct, although it's not a question of the number of bytes
> but rather the returned range of integers - if your locale is en.US then
> that should be 0-255.. if it is en_US.utf8 the range is considerably
> larger.

In my tests, my locale is en_GB.utf8 and the python getch() function
does return a number of bytes - see below.

>> E.g. given utf-8 encoding, if I press the key '?' on my keyboard (which
>> encoded as '\xc3\xa9' in utf-8), I will need two calls to getch() to get
>> this: the first one will return 0xC3 and the second one 0xA9.
>
> No. A single call to getch() will grab your " ?" and return 0xc3a9,
> decimal 50089.

It is the case though that on my machine, if I press '?' then call
getch() it will return 0xC3.  A further call to getch() will return
0xA9.  This I was I was talking about getch() returning bytes: to me it
behaves as if it returns the encoded characters byte by byte.

>> Instead of getting a stream of bytes and special keycodes (with value >
>> 255) from getch(), what I want is a stream of *unicode characters* and
>> special keycodes.
>
> This is what getch(3NCURSES) does: it returns the integer value of one
> "unicode character".

It is not what happens in my tests.  I have made a simple testing
script, see below.

> Likewise, I would assume that looping over the python equivalent of
> getch() will not return a stream of bytes but rather a "stream" of
> integers that map one to one to the "unicode characters" that were
> entered at the terminal.



> Note: I am only familiar with languages such as English, Spanish,
> French, etc. where only one terminal cell is used for each glyph. My
> understanding is that things get somewhat more complicated with
> languages that require so-called "wide characters" - two terminal cells
> per character, but that's a different issue.
>
>> So, still assuming utf-8 encoding in the terminal, if I type:
>> 
>>     T?[KEY_UP]?a
>> 
>> iterating call to the getch() function will give me this sequence of
>> integers:
>> 
>>     84, 195, 169, 259,   195, 167, 97
>>     T-  ?-------  KEY_UP ?-------  a-
>> 
>> But what I want to get this stream instead:
>> 
>>     u'T', u'?', 259, u'?', u'a'
>
> No, for the above, getch() will return:
>
>      84, 50089, 259, 50087, 97
>
> .. which is "functionally" equivalent to:
>
>      u'T', u'?', 259, u'?', u'a'
>
> [..]
>
> So shouldn't this issue boil down to just a matter of casting the
> integers to the "u" data type?
>
> This short snippet may help clarify the above:
>
> -----------------------------------------------------------------------
> #include <locale.h>
> #include <ncurses.h>
> #include <stdlib.h>
> #include <stdio.h>
> #include <string.h>
>
> int unichar;
>
> int main(int argc, char *argv[])
> {
>   setlocale(LC_ALL, "en_US.UTF.8");        /* make sure UTF8       */
>   initscr();                               /* start curses mode    */
>   raw();
>   keypad(stdscr, TRUE);                    /* pass special keys    */
>   unichar = getch();                       /* read terminal        */
>
>   mvprintw(24, 0, "Key pressed is = %4x ", unichar);
>
>   refresh();
>   getch();                                 /* wait                 */
>   endwin();                                /* leave curses mode    */
>   return 0;
> }
> -----------------------------------------------------------------------
>
> Hopefully you have access to a C compiler:
>
> $ gcc -lncurses uni00.c -o uni00

Thanks for this.  When I test it on my machine (BTW it is MacOS 10.5.7),
if I type an ASCII character (e.g. 'A'), I get its ASCII code (0x41),
but if I type a non-ascii character (e.g. '?') I get back to the prompt
immediately.  It must be because two values are queued for getch.  I
should try it on a Linux machine, but I don't have one handy at the
moment.

I have made a little test script in Python which is similar but will
only stop when 'Esc' is pressed.

--------------------------------------------------
import curses

def getcodes(win):
    codes = []
    while True:
        c = win.getch()
        if c == 27:
            return codes
        codes.append(c)

print curses.wrapper(getcodes)
--------------------------------------------------

If I try this in a Terminal and type 'sou?i[ESC]', I get this:

[115, 111, 117, 195, 167, 105]
 s--, o--, u--, ?-------, i--

As you see, two calls to getch() were necessary after typing '?'.
BTW on the same terminal:

marigold:junk arno$ locale
LANG="en_GB.UTF-8"
LC_COLLATE="en_GB.UTF-8"
LC_CTYPE="en_GB.UTF-8"
LC_MESSAGES="en_GB.UTF-8"
LC_MONETARY="en_GB.UTF-8"
LC_NUMERIC="en_GB.UTF-8"
LC_TIME="en_GB.UTF-8"
LC_ALL=

I will have to do tests with other encodings.

-- 
Arnaud


From yinon.me at gmail.com  Sun May 31 04:30:32 2009
From: yinon.me at gmail.com (Yinon Ehrlich)
Date: Sun, 31 May 2009 01:30:32 -0700 (PDT)
Subject: Only run one specific test
References: <87k542dtzq.fsf@vostro.rath.org>
	<mailman.851.1243534574.8015.python-list@python.org> 
	<87skipc9wp.fsf@vostro.rath.org>
Message-ID: <99f13d77-3d0c-4b7a-af9f-4ae1e035a69e@h18g2000yqj.googlegroups.com>


>
> Yes, that works indeed. But in practice the modules_to_import list is
> filled by parsing the contents of a test/*.py directory. That's why I
> import dynamically with __import__.
>
> Nevertheless, you got me on the right track. After I explicitly added
> the modules to the global namespace (globals()["mytest"] =
> __import__("mytest")), it works fine. Thx!

Another way to do it is using imp.load_source,
see http://waf.googlecode.com/svn/trunk/test/Test.py
  Yinon


From michele.petrazz at REMOTEME_unipex.it  Sun May 31 04:37:29 2009
From: michele.petrazz at REMOTEME_unipex.it (Michele Petrazzo)
Date: Sun, 31 May 2009 10:37:29 +0200
Subject: try except inside exec
In-Reply-To: <f8fa5a89-9b49-4e1f-a4e4-c369ba6c71ae@s31g2000vbp.googlegroups.com>
References: <gvor0g$679$1@nnrp-beta.newsland.it>
	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>
	<gvp0gn$9qh$1@nnrp-beta.newsland.it>
	<f8fa5a89-9b49-4e1f-a4e4-c369ba6c71ae@s31g2000vbp.googlegroups.com>
Message-ID: <gvtfk9$o8n$1@nnrp-beta.newsland.it>

Aaron Brady wrote:
> Exceptions are only caught when raised in a 'try' statement.  If you
>  don't raise the exception in a try statement, it won't be caught.
> 
> The function you posted will raise an exception.  If you are making 
> the call yourself, that is, if only the definition is foreign, then 
> simply catch exceptions when so.
> 

Seeing my code and reading you post I found that... yes, are a my fault!
I'm catching only an exception in a code/function definition, no its
execution!

Just modified my code to catch the exception *inside* the def and not
before and... now work!

Michele


From beni.cherniavsky at gmail.com  Sun May 31 05:41:14 2009
From: beni.cherniavsky at gmail.com (Beni Cherniavsky)
Date: Sun, 31 May 2009 02:41:14 -0700 (PDT)
Subject: Optimizing math functions
References: <mailman.619.1243084999.8015.python-list@python.org>
Message-ID: <c272be44-d369-40c2-a5ff-ce9bb2bbf805@c36g2000yqn.googlegroups.com>

On May 23, 4:22?pm, Esmail <ebo... at hotmail.com> wrote:
>
> Is there some sort of simple Python module that would allow me to
> evaluate this type of function?
>
> In this particular instance I am interested in the minimum of
>
> ? ?x * sin(4*x) + 1.1 * sin(2*y), where x,y in range 0-10
>
> though in other problems the range may not be identical for x and y.

Take a look at http://openopt.org (python-scikits-openopt on debian/
ubuntu) - a lot of optimization engines under one interface, so you
can try different engines easily and without learning many interfaces.

>>> import openopt
>>> from numpy import *
# openopt passes parameters as single vector.
>>> def f((x,y)):
	return x * sin(4*x) + 1.1 * sin(2*y)
# GLP finds global minimum - can be hard, but let's try.
# I'm not constraining the effort in hope it will converge quickly.
>>> opt = openopt.GLP(f, lb=array([0, 0]), ub=array([10, 10]))
# 'galileo' is one of the supported GLP solvers, included out of the
box.
>>> sol = opt.solve('galileo', plot=True)
-----------------------------------------------------
solver: galileo   problem: unnamed
 iter    objFunVal
    0  3.966e+00
   10  -6.190e+00
   20  -7.613e+00
   30  -7.613e+00
   35  -7.613e+00
istop:  11 (Non-Success Number > maxNonSuccess = 15)
Solver:   Time Elapsed = 0.78 	CPU Time Elapsed = 0.24
Plotting: Time Elapsed = 8.04 	CPU Time Elapsed = 2.21
objFunValue: -7.6132332 (feasible, max constraint =  0)
### here you need to close the runtime-value graph to continue ###
>>> sol.ff
-7.6132331733254421
>>> sol.xf
array([ 7.3418726 ,  5.44153445])

That is x=7.3418726, y=5.44153445 gives f=-7.6132331733254421.
Makes sense?


From beni.cherniavsky at gmail.com  Sun May 31 05:51:18 2009
From: beni.cherniavsky at gmail.com (Beni Cherniavsky)
Date: Sun, 31 May 2009 02:51:18 -0700 (PDT)
Subject: Optimizing math functions
References: <mailman.619.1243084999.8015.python-list@python.org> 
	<c272be44-d369-40c2-a5ff-ce9bb2bbf805@c36g2000yqn.googlegroups.com>
Message-ID: <57cd6ea8-c097-442a-9048-ede55ca68f9a@x3g2000yqa.googlegroups.com>

On May 31, 12:41?pm, Beni Cherniavsky <beni.cherniav... at gmail.com>
wrote:
>
> Take a look athttp://openopt.org(python-scikits-openopt on debian/
> ubuntu) - a lot of optimization engines under one interface, so you
> can try different engines easily and without learning many interfaces.
>
Correction: don't use the debian package, it uses an old snapshot of
openopt.
Install from svn, it's very easy (checkout, setup.py).


From tjreedy at udel.edu  Sun May 31 06:32:32 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 31 May 2009 06:32:32 -0400
Subject: Have a variable column length in printf
In-Reply-To: <4A223001.5010809@islandtraining.com>
References: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
	<4A223001.5010809@islandtraining.com>
Message-ID: <gvtmbu$s0v$1@ger.gmane.org>

Gary Herron wrote:
> Cameron Pulsford wrote:
>> Hello all, I'm trying to pretty print a list, so I am doing something 
>> like
>>
>> print '%3d' % integer
>>
>> only I would like that 3 to be a variable, instead of hardcoded. Is 
>> this possible, or are there any other ways to accomplish this? Thanks!
> 
> Use a '*' instead of fixed width, and then supply the actual width as a 
> separate parameter:
> 
>  >>> print '%*d' % (5,123)
>  123

In the new string formating, fields can be nested withing fields.  For 
3.1, with auto field numbering:
 >>> "{:{}d}".format(12,4)
'  12'

Otherwise, {0:{1}d}

tjr



From arnodel at googlemail.com  Sun May 31 07:08:33 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 31 May 2009 12:08:33 +0100
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl> <m2r5y61f5y.fsf@googlemail.com>
	<m2octacim1.fsf@cs.uu.nl> <m2iqjh23jq.fsf@googlemail.com>
	<003e1491$0$9723$c3e8da3@news.astraweb.com>
Message-ID: <m263fh1qdq.fsf@googlemail.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

> On Sun, 31 May 2009 07:24:09 +0100, Arnaud Delobelle wrote:
>
>> AFAIK, 'complexity' means 'worst case complexity' unless otherwise
>> stated.
>
> No, it means "average or typical case" unless otherwise specified. 
> Consult almost any comp sci text book and you'll see hash tables with 
> chaining (like Python dicts) described as O(1) rather than O(N), 
> Quicksort as O(N log N) instead of O(N**2), and similar. If the default 
> was "worst case unless otherwise specified", then Quicksort would be 
> called "Slower than Bubblesort Sort".
>
> (Both are O(N**2), but Quicksort does more work.)

OK.  I remember from my student years when studying complexity theory
that complexity implicitely referred to worst case complexity.  I
assumed this was a widely used convention - I don't have any evidence
that it is so you may very well be correct.

Anyway, it's good to know that quicksort is O(n^2) in the worst case -
and that this worst case can crop up very easily in some situations,
especially if not too much care has been taken implementing it.

[...]

> It is simply misleading to describe dicts as O(N) without the 
> qualification "if the data is chosen maliciously, or otherwise by an 
> incredible fluke". And even if it isn't, Piet explicitly said he was 
> talking about the average behaviour, not worst.

But the OP only mentioned 'complexity', not 'average complexity', and I
imagine that he knows the average case complexity of accessing a key in
a hashtable.

-- 
Arnaud


From ldo at geek-central.gen.new_zealand  Sun May 31 07:20:40 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 31 May 2009 23:20:40 +1200
Subject: which database is suitable for small applications
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
	<mailman.744.1243333471.8015.python-list@python.org>
	<52801358-c037-458d-8857-a78c2d881ddb@z16g2000prd.googlegroups.com>
Message-ID: <gvtp69$2i9$1@lust.ihug.co.nz>

In message <52801358-c037-458d-8857-
a78c2d881ddb at z16g2000prd.googlegroups.com>, Ankit wrote:

> If your application does not require you to add very heavy data then
> you can also use flat files to do your stuff.
> Its always a better to use Databases ...

It's not always better to use databases. By definition, data for a ?small? 
application is bound to fit entirely in RAM. So certainly the simplest thing 
to do is read a whole data file in at the start, and write the entire 
updated data structure back out again at the end.



From martin at hvidberg.net  Sun May 31 08:08:40 2009
From: martin at hvidberg.net (martin at hvidberg.net)
Date: Sun, 31 May 2009 05:08:40 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
	<023130ef$0$19421$c3e8da3@news.astraweb.com>
Message-ID: <f84b2a23-9e6b-46f3-9e7a-7b1c8ce5eeb1@k2g2000yql.googlegroups.com>

On May 30, 4:10?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sat, 30 May 2009 12:06:55 +0200, jkv wrote:
> > I added a few lines to your script, and now it ought to only print files
> > newer than 3601 seconds (3600 seconds is one hour).
> ...
> > ? ? #if file newer than one hour print a line
> > ? ? if time_difference < 3601:
>
> That's a potential off-by-one error. That may print files that are older
> than one hour. Admittedly, they'll be off by less than one second, but if
> you're going to write code, write correct code. The right test is:
>
> ? ? if time_difference <= 3600:
>
> (and you may even want to deal with files that have a *negative* time
> difference, e.g. they were created apparently in the future).
>
> This is particularly necessary if you use time.time() to generate the
> current time, since that returns fractions of a second. But even if you
> don't, it's still the right thing to do: it's defensive programming.
> Rather than assume that all file systems store timestamps accurate only
> to a second, assume that some file system, somewhere, will be accurate to
> fractions of a second, and code accordingly.
>
> That way, no matter what the file system does, your code will still do
> the right thing, and (in this case) it doesn't even cost you anything.
>
> --
> Steven

Hi Steve thanks for your comment.
But I only need it to re-run some test scripts in case there seems to
be hick-up in our live download of satellite images. It's not critical
within seconds, not even within minutes...
But in principel the potential error could of cause be important - in
other context.

:-) M


From martin at hvidberg.net  Sun May 31 08:14:44 2009
From: martin at hvidberg.net (martin at hvidberg.net)
Date: Sun, 31 May 2009 05:14:44 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
	<4a211df1$0$25199$ba624c82@nntp02.dk.telia.net> 
	<00cd89ce-cab2-42bf-8b91-0b147e6763e1@t21g2000yqi.googlegroups.com> 
	<mailman.934.1243719478.8015.python-list@python.org>
Message-ID: <4b71bdf4-566c-416f-b7b1-148f1eadbd36@c19g2000yqc.googlegroups.com>

On May 30, 11:37?pm, jkv <j... at unixcluster.dk> wrote:
> mar... at hvidberg.net wrote:
> > Thanks both
>
> > The first answer is quite instuctive, the other one might be the one
> > I'll use in t
>
> I didn't receive the other answer, could you please forward it to me?> So 2x thanks.
>
> You are welcome.
>
> I took another look at your code, and you can compress it all to a if
> "oneliner":
> (and thanks to Steven for the <= reminder)
>
> ? ? ? ? if os.path.isfile(x):
> ? ? ? ? ? ? nSize = os.path.getsize(x)
> ? ? ? ? ? ? #if oneliner
> ? ? ? ? ? ? if time.mktime(time.localtime()) -
> time.mktime(time.localtime(os.path.getmtime(x))) <= 3600:
> ? ? ? ? ? ? ? print ('HT fil -> %s %d @ %s') % (x, nSize, time.asctime)

I encurrage both Clarity and Brevity, but usually in that order.
In other words, I don't mind to split a statement in two (or three)
sub-sentenses, if it increases Clarity. As long as it dosn't so large
that I loose the overview, and as long as it dosn't affect runtime
performance.


From martin at hvidberg.net  Sun May 31 08:19:41 2009
From: martin at hvidberg.net (martin at hvidberg.net)
Date: Sun, 31 May 2009 05:19:41 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<fa295d10-693d-4277-990a-6d4baff520b3@c9g2000yqm.googlegroups.com>
Message-ID: <3fab52de-f2db-4812-a80a-d195d2223730@y7g2000yqa.googlegroups.com>

>
> http://en.wikipedia.org/wiki/Subtraction
>


Only one problem, wise arse:
TypeError: unsupported operand type(s) for -: 'time.struct_time' and
'time.struct_time'

Like I didn't try that...


From sjmachin at lexicon.net  Sun May 31 09:06:49 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 31 May 2009 06:06:49 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<fa295d10-693d-4277-990a-6d4baff520b3@c9g2000yqm.googlegroups.com> 
	<3fab52de-f2db-4812-a80a-d195d2223730@y7g2000yqa.googlegroups.com>
Message-ID: <b0bee236-670d-40f1-b274-b6db88af1796@j32g2000yqh.googlegroups.com>

On May 31, 10:19?pm, mar... at hvidberg.net wrote:
> >http://en.wikipedia.org/wiki/Subtraction
>
> Only one problem, wise arse:
> TypeError: unsupported operand type(s) for -: 'time.struct_time' and
> 'time.struct_time'
>
> Like I didn't try that...

The point being that you can subtract them in other ways than by
shoving a - between them and throwing the result at Python. What you
were doing was like saying "I was born in January MCMLXXXIX and it's
now MMIX; how do I work out how old I am?" when you *already* had the
relevant numbers in a easily-subtractable form.


From bdsatish at gmail.com  Sun May 31 09:39:02 2009
From: bdsatish at gmail.com (bdsatish)
Date: Sun, 31 May 2009 06:39:02 -0700 (PDT)
Subject: Class Methods help
Message-ID: <db09ede0-f8b3-433f-845e-f41adeeb7b99@a36g2000yqc.googlegroups.com>

Hi,

    I have a question regarding the difference b/w "class methods" and
"object methods". Consider for example:

class  MyClass:
    x = 10

Now I can access MyClass.x -- I want a similar thing for functions. I
tried

class MyClass:
    def  some_func(x):
        return x+2

When I call MyClass.some_func(10) -- it fails, with error message:


TypeError: unbound method some_func() must be called with MyClass
instance as first argument (got int instance instead)

OK. I figured out that something like this works:
obj = MyClass()
y = obj.some_func(10)

BUT, this means that we have functions applying for instances. That is
we have "instance method". Now, how do I implement some function which
I can invoke with the class name itself ? Instead of creating a dummy
object & then calling.... In short, how exactly do I create "class
methods" ??









From python.list at tim.thechases.com  Sun May 31 09:43:48 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 31 May 2009 08:43:48 -0500
Subject: Class Methods help
In-Reply-To: <db09ede0-f8b3-433f-845e-f41adeeb7b99@a36g2000yqc.googlegroups.com>
References: <db09ede0-f8b3-433f-845e-f41adeeb7b99@a36g2000yqc.googlegroups.com>
Message-ID: <4A228994.6020706@tim.thechases.com>

> class MyClass:
>     def  some_func(x):
>         return x+2
> 
> When I call MyClass.some_func(10) -- it fails, with error message:
> 
> 
> TypeError: unbound method some_func() must be called with MyClass
> instance as first argument (got int instance instead)
> 
> OK. I figured out that something like this works:
> obj = MyClass()
> y = obj.some_func(10)
> 
> BUT, this means that we have functions applying for instances. That is
> we have "instance method". Now, how do I implement some function which
> I can invoke with the class name itself ? Instead of creating a dummy
> object & then calling.... In short, how exactly do I create "class
> methods" ??

You mean the classmethod decorator? :)

   class MyClass:
     @classmethod
     def some_func(cls, x):
       return x+2

   MyClass.some_func(42)

(the decorator syntax was added in 2.4, so if you need it in 
pre-2.4, you'd have to do

   class MyClass:
     def some_func(cls, x):
       return x+2
     some_func = classmethod(some_func)

to get the same behavior)

-tkc




From lie.1296 at gmail.com  Sun May 31 09:44:26 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 31 May 2009 13:44:26 GMT
Subject: Class Methods help
In-Reply-To: <db09ede0-f8b3-433f-845e-f41adeeb7b99@a36g2000yqc.googlegroups.com>
References: <db09ede0-f8b3-433f-845e-f41adeeb7b99@a36g2000yqc.googlegroups.com>
Message-ID: <_QvUl.14954$y61.8697@news-server.bigpond.net.au>

bdsatish wrote:
> Hi,
> 
>     I have a question regarding the difference b/w "class methods" and
> "object methods". Consider for example:
> 
> class  MyClass:
>     x = 10
> 
> Now I can access MyClass.x -- I want a similar thing for functions. I
> tried
> 
> class MyClass:
>     def  some_func(x):
>         return x+2
> 
> When I call MyClass.some_func(10) -- it fails, with error message:
> 
> 
> TypeError: unbound method some_func() must be called with MyClass
> instance as first argument (got int instance instead)
> 
> OK. I figured out that something like this works:
> obj = MyClass()
> y = obj.some_func(10)
> 
> BUT, this means that we have functions applying for instances. That is
> we have "instance method". Now, how do I implement some function which
> I can invoke with the class name itself ? Instead of creating a dummy
> object & then calling.... In short, how exactly do I create "class
> methods" ??
with staticmethod decorator:

>>> class MyClass:
...     @staticmethod
...     def some_func(x):
...         return x+2
...
>>> MyClass.some_func(10)
12



From bdsatish at gmail.com  Sun May 31 09:48:25 2009
From: bdsatish at gmail.com (bd satish)
Date: Sun, 31 May 2009 16:48:25 +0300
Subject: Class Methods help
In-Reply-To: <_QvUl.14954$y61.8697@news-server.bigpond.net.au>
References: <db09ede0-f8b3-433f-845e-f41adeeb7b99@a36g2000yqc.googlegroups.com>
	<_QvUl.14954$y61.8697@news-server.bigpond.net.au>
Message-ID: <fa06d30b0905310648q7d01cd43ncb56ab723ae53f40@mail.gmail.com>

Thanks to Tim Chase & Lie Ryan !!  That was exactly what I was looking for !!

It's time for me to now read the documentation of "decorators" and
@classmethod and also @staticmethod.

I'm quite new to decorators...


-- Satish BD


On Sun, May 31, 2009 at 4:44 PM, Lie Ryan <lie.1296 at gmail.com> wrote:
> bdsatish wrote:
>> Hi,
>>
>> ? ? I have a question regarding the difference b/w "class methods" and
>> "object methods". Consider for example:
>>
>> class ?MyClass:
>> ? ? x = 10
>>
>> Now I can access MyClass.x -- I want a similar thing for functions. I
>> tried
>>
>> class MyClass:
>> ? ? def ?some_func(x):
>> ? ? ? ? return x+2
>>
>> When I call MyClass.some_func(10) -- it fails, with error message:
>>
>>
>> TypeError: unbound method some_func() must be called with MyClass
>> instance as first argument (got int instance instead)
>>
>> OK. I figured out that something like this works:
>> obj = MyClass()
>> y = obj.some_func(10)
>>
>> BUT, this means that we have functions applying for instances. That is
>> we have "instance method". Now, how do I implement some function which
>> I can invoke with the class name itself ? Instead of creating a dummy
>> object & then calling.... In short, how exactly do I create "class
>> methods" ??
> with staticmethod decorator:
>
>>>> class MyClass:
> ... ? ? @staticmethod
> ... ? ? def some_func(x):
> ... ? ? ? ? return x+2
> ...
>>>> MyClass.some_func(10)
> 12
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From Scott.Daniels at Acm.Org  Sun May 31 10:21:48 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 31 May 2009 07:21:48 -0700
Subject: How do I sample randomly based on some probability(wightage)?
In-Reply-To: <a380edb3-77f6-4e0d-bccd-2bff92b7cb1b@k2g2000yql.googlegroups.com>
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<uIadnZ8appu3y4DXnZ2dnUVZ_radnZ2d@pdx.net>
	<a380edb3-77f6-4e0d-bccd-2bff92b7cb1b@k2g2000yql.googlegroups.com>
Message-ID: <FOGdnQw3svOEDL_XnZ2dnUVZ_hGdnZ2d@pdx.net>

Sumitava Mukherjee wrote:
> On May 27, 8:08 pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
>> Sumitava Mukherjee wrote:
>>> I need to randomly sample from a list where all choices have weights
>>> attached to them. The probability of them being choosen is dependent
>>> on the weights.
>> I am not sure why everybody is normalizing by dividing the weights.
>> This isa possibility (I had fun writing it).
>>
>> def sample_without_replacement(choices, weights):
>> ...  combined = [(w, v) for w, v in zip(weights, choices) if w > 0]
>> ...  total = sum(w for w, v in combined) # sum(weights) also works
>>      while combined:
>> ...
>>          yield choice
>>          total -= weight
>>          if weight > total * 256: # arbitrary choice for recalculation
>>              # precision affected, rebuild
>>              total = sum(w for w, v in combined)
>>          del combined[n]
>>      raise ValueError('Samplng more than %d without replacement?' % (
>>                        sum(1 for w in weights if w > 0)))
>> ...
Should be:
            total -= weight
            yield choice
            del combined[n]
            if weight > total * 256: # arbitrary choice for recalculation
                 # precision affected, rebuild
                 total = sum(w for w, v in combined)
        raise ValueError('Samplng more than %d without replacement?' % (
                                       sum(1 for w in weights)))
There were two mistakes, both related to the definition of combined:
  (1) Combined only holds positive values, so testing in sum is silly.
  (2) Total is meant to track the sum of weights in combined, and the
      update was misplaced with respect to the delete.

> Among all the help (all of which I really appreciate), I found your
> solution closest to what I was expecting. Thanks a lot Scott.

You are welcome (presuming I didn't simply do your homework).  I only
noticed the problems above while scanning your reply.  The failures I
noticed should have been caught with good tests or a pair programming
partner.  Of course, in this environment, I didn't have either high
quality tests or a partner (I did simple hand testing and eyeball
analysis).

--Scott David Daniels
Scott.Daniels at Acm.Org


From Scott.Daniels at Acm.Org  Sun May 31 11:00:04 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 31 May 2009 08:00:04 -0700
Subject: hash and __eq__
In-Reply-To: <m263fh1qdq.fsf@googlemail.com>
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl> <m2r5y61f5y.fsf@googlemail.com>
	<m2octacim1.fsf@cs.uu.nl> <m2iqjh23jq.fsf@googlemail.com>
	<003e1491$0$9723$c3e8da3@news.astraweb.com>
	<m263fh1qdq.fsf@googlemail.com>
Message-ID: <1qKdnek8ke6MB7_XnZ2dnUVZ_qadnZ2d@pdx.net>

Arnaud Delobelle wrote:
> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> 
>> On Sun, 31 May 2009 07:24:09 +0100, Arnaud Delobelle wrote:
>>
>>> AFAIK, 'complexity' means 'worst case complexity' unless otherwise
>>> stated.
>> No, it means "average or typical case" unless otherwise specified. 

I think you both are standing on opposite sides of a shift in notation.
Mathematics changes notations all the time, and new students are
presented notation as if it were a fixed thing.  What I think is
happening is that O-notation was a very technical notation used
for comparing abstract algorithms (providing an analysis that would
survive centuries of engineering improvement of the machines).  More
recently we have seen more use of average-case performance analysis,
in service of shorter-term accuracy (I guess).  Certainly this has
given us some data structures that would be hard to justify on a
worst-case analysis.  I suspect the default is shifting towards
average case (although it may already be there).  Certainly best
practice for the next couple of decades would be to be explicit
about the meaning

--Scott David Daniels
Scott.Daniels at Acm.Org


From __peter__ at web.de  Sun May 31 12:11:06 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 31 May 2009 18:11:06 +0200
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<uIadnZ8appu3y4DXnZ2dnUVZ_radnZ2d@pdx.net>
	<a380edb3-77f6-4e0d-bccd-2bff92b7cb1b@k2g2000yql.googlegroups.com>
	<FOGdnQw3svOEDL_XnZ2dnUVZ_hGdnZ2d@pdx.net>
Message-ID: <gvua6l$fkb$01$1@news.t-online.com>

Scott David Daniels wrote:

> raise ValueError('Samplng more than %d without replacement?' % (
> sum(1 for w in weights)))

That would be len(weights)

> There were two mistakes, both related to the definition of combined:
> (1) Combined only holds positive values, so testing in sum is silly.
 
but I think your first version was correct; I don't see were you remove the 
0-items from weights.

Peter



From seattlehanks at yahoo.com  Sun May 31 12:24:23 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 09:24:23 -0700 (PDT)
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<af1d0d42-0d62-4857-9e5c-6b18b7d79891@x3g2000yqa.googlegroups.com> 
	<cf7d562c-778c-4f06-a2ce-a58561dc0dfb@h2g2000yqg.googlegroups.com> 
	<fdef7f4c-e7f2-4afa-aa72-6b1550d11c3d@f19g2000yqh.googlegroups.com> 
	<m2eiu52102.fsf@googlemail.com>
Message-ID: <be36c91d-51f7-4675-8de1-63de60b1385b@n21g2000vba.googlegroups.com>

On May 31, 12:19?am, Arnaud Delobelle <arno... at googlemail.com> wrote:
> LittleGrasshopper <seattleha... at yahoo.com> writes:
> > On May 30, 6:15?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> >> On May 30, 5:32?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
> >> > On May 30, 4:01?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
> >> > > I am experimenting with metaclasses, trying to figure out how things
> >> > > are put together.
>
> Have you read Guido's 'Unifying types and classes in Python 2.2' [1]? ?I
> read it a long time ago but I remember it being very enlightening.
>
> [1]http://www.python.org/download/releases/2.2.3/descrintro/
>
> --
> Arnaud

I haven't actually read it, but I will now. Thanks for pointing it
out, Arnaud.


From cameron.pulsford at gmail.com  Sun May 31 12:33:58 2009
From: cameron.pulsford at gmail.com (Cameron Pulsford)
Date: Sun, 31 May 2009 12:33:58 -0400
Subject: Have a variable column length in printf
In-Reply-To: <gvtmbu$s0v$1@ger.gmane.org>
References: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
	<4A223001.5010809@islandtraining.com> <gvtmbu$s0v$1@ger.gmane.org>
Message-ID: <5700df6b0905310933v39294468sa44f325ba9628cfd@mail.gmail.com>

Thanks all, I think I'l stick with the '*' method because this is just a one
time thing for a __repr__ function and it seems easiest.

On Sun, May 31, 2009 at 6:32 AM, Terry Reedy <tjreedy at udel.edu> wrote:

> Gary Herron wrote:
>
>> Cameron Pulsford wrote:
>>
>>> Hello all, I'm trying to pretty print a list, so I am doing something
>>> like
>>>
>>> print '%3d' % integer
>>>
>>> only I would like that 3 to be a variable, instead of hardcoded. Is this
>>> possible, or are there any other ways to accomplish this? Thanks!
>>>
>>
>> Use a '*' instead of fixed width, and then supply the actual width as a
>> separate parameter:
>>
>>  >>> print '%*d' % (5,123)
>>  123
>>
>
> In the new string formating, fields can be nested withing fields.  For 3.1,
> with auto field numbering:
> >>> "{:{}d}".format(12,4)
> '  12'
>
> Otherwise, {0:{1}d}
>
> tjr
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From cjns1989 at gmail.com  Sun May 31 13:07:48 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Sun, 31 May 2009 13:07:48 -0400
Subject: decoding keyboard input when using curses
In-Reply-To: <m2ab4t1yv3.fsf@googlemail.com>
References: <m2vdni1fbc.fsf@googlemail.com>
	<mailman.944.1243750942.8015.python-list@python.org>
	<m2ab4t1yv3.fsf@googlemail.com>
Message-ID: <20090531170748.GB2451@turki.gavron.org>

On Sun, May 31, 2009 at 04:05:20AM EDT, Arnaud Delobelle wrote:

[..]

> Thanks for this.  When I test it on my machine (BTW it is MacOS 10.5.7),
> if I type an ASCII character (e.g. 'A'), I get its ASCII code (0x41),
> but if I type a non-ascii character (e.g. '?') I get back to the prompt
> immediately.  It must be because two values are queued for getch.  I
> should try it on a Linux machine, but I don't have one handy at the
> moment.

Well so much for transparency :-(

Try this:

#include <locale.h>
#include <ncurses.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

int ct;
wint_t unichar;

int main(int argc, char *argv[])
{
  setlocale(LC_ALL, "");                 /* make sure UTF8       */
  initscr();
  raw();
  keypad(stdscr, TRUE);
  ct = get_wch(&unichar);                /* read character       */
  mvprintw(24, 0, "Key pressed is = %4x ", unichar);

  refresh();
  get_wch();
  endwin();
  return 0;
}

gcc -lncursesw uni10.c -o uni10         # different lib..
             ^

Seems there's more to it than my assupmtion that the python wrapper was
not wrapping as transparaently as it should.. here I'm using wide
characters.. not sure how this translates to python.

CJ




From jmd.khanna at gmail.com  Sun May 31 14:10:32 2009
From: jmd.khanna at gmail.com (tristan625)
Date: Sun, 31 May 2009 11:10:32 -0700 (PDT)
Subject: problem with python com and python extensions
Message-ID: <aae53a2c-40e7-491b-82c6-d10d04672684@b9g2000yqm.googlegroups.com>

hi all,
Here is my problem,i have developed a python extension using
vs2003 ,iam using python 2.5.2,the extension enumerates the
certificates in the windows certificate store and returns a list of
tuples containing a tuple for each certificate found containing the
certificates display name,subject and issuer,everything works fine
when  i run the code through the interpreter,the problem comes when i
create a python com object that imports this extensions
functionality,the com dll is created successfully but i am unable to
access any of the functions in it .



any help will be great


From arnodel at googlemail.com  Sun May 31 14:30:54 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 31 May 2009 19:30:54 +0100
Subject: decoding keyboard input when using curses
References: <m2vdni1fbc.fsf@googlemail.com>
	<mailman.944.1243750942.8015.python-list@python.org>
	<m2ab4t1yv3.fsf@googlemail.com>
	<mailman.951.1243789691.8015.python-list@python.org>
Message-ID: <m2zlctyvj5.fsf@googlemail.com>

Chris Jones <cjns1989 at gmail.com> writes:
[...]
> Try this:
>
> #include <locale.h>
> #include <ncurses.h>
> #include <stdlib.h>
> #include <stdio.h>
> #include <string.h>

/* Here I need to add the following include to get wint_t on macOS X*/

#include <wctype.h>

>
> int ct;
> wint_t unichar;
>
> int main(int argc, char *argv[])
> {
>   setlocale(LC_ALL, "");                 /* make sure UTF8       */
>   initscr();
>   raw();
>   keypad(stdscr, TRUE);
>   ct = get_wch(&unichar);                /* read character       */
>   mvprintw(24, 0, "Key pressed is = %4x ", unichar);
>
>   refresh();
>   get_wch();
>   endwin();
>   return 0;
> }
>
> gcc -lncursesw uni10.c -o uni10         # different lib..
>              ^

My machine doesn't know about libncursesw:

marigold:c arno$ ls /usr/lib/libncurses*
/usr/lib/libncurses.5.4.dylib
/usr/lib/libncurses.dylib
/usr/lib/libncurses.5.dylib

So I've compiled it with libncurses as before and it works.

This is what I get:

If I run the program and type '?', I get a code of 'e9'.

In python:

>>> print '\xe9'.decode('latin1')
?

So it has been encoded using isolatin1.  I really don't understand why.
I'll have to investigate this further.

If I change the line:

   setlocale(LC_ALL, "");                 /* make sure UTF8       */

to

   setlocale(LC_ALL, "en_GB.UTF-8");       /* make sure UTF8       */

then the behaviour is the same as before (i.e. get_wch() gets called
twice instantly).

I'll do some more investigating (when I can think of *what* to
investigate) and I will tell you my findings.

Thanks

-- 
Arnaud


From CGenie at gmail.com  Sun May 31 15:08:16 2009
From: CGenie at gmail.com (CoolGenie)
Date: Sun, 31 May 2009 12:08:16 -0700 (PDT)
Subject: automated web with python?
Message-ID: <c179782f-e5e7-4d9d-80af-f22f31deae44@y7g2000yqa.googlegroups.com>

Hello,
Recently my company changed the system. It is better for the
management, but for us workers it is a nightmare. For example, we are
required to enter a huge database (nested) using a web form! Make one
mistake and you have to edit it and then use 4 mouse clicks, not
counting the time it takes to load every web page.
My question is: can Python somewhat relieve this pain? Maybe this web
browser stuff could be somewhat automated... At first check it doesn't
seem easy, since it uses authorization methods, aspx, and so on... And
we don't have access to the underlying database, only this stupid web
form.
I'll appreciate any help.
Best regards,
Przemek


From Scott.Daniels at Acm.Org  Sun May 31 15:15:51 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 31 May 2009 12:15:51 -0700
Subject: How do I sample randomly based on some probability(wightage)?
In-Reply-To: <gvua6l$fkb$01$1@news.t-online.com>
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<uIadnZ8appu3y4DXnZ2dnUVZ_radnZ2d@pdx.net>
	<a380edb3-77f6-4e0d-bccd-2bff92b7cb1b@k2g2000yql.googlegroups.com>
	<FOGdnQw3svOEDL_XnZ2dnUVZ_hGdnZ2d@pdx.net>
	<gvua6l$fkb$01$1@news.t-online.com>
Message-ID: <Ro6dnYawJ4GeS7_XnZ2dnUVZ_sydnZ2d@pdx.net>

Peter Otten wrote:
> Scott David Daniels wrote:
>  [a real correction and a bogus one]
>> raise ValueError('Samplng more than %d without replacement?' % (
>> sum(1 for w in weights)))
> That would be len(weights)
Yup, probably I should have just saved len(combined).

> but I think your first version was correct; I don't see were you remove the 
> 0-items from weights.

You are right.  I thought I was looking at combined on the second,
realized my mistake, and thought, Oh well, it'll work out later.
The other mistake wasn't too bad either, as all that would happen
is that an internal exception would get raised, any answers delivered
are delivered with the correct probabilities.

--Scott David Daniels
Scott.Daniels at Acm.Org


From debatem1 at gmail.com  Sun May 31 15:38:46 2009
From: debatem1 at gmail.com (CTO)
Date: Sun, 31 May 2009 12:38:46 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
	<4a211df1$0$25199$ba624c82@nntp02.dk.telia.net> 
	<00cd89ce-cab2-42bf-8b91-0b147e6763e1@t21g2000yqi.googlegroups.com> 
	<mailman.934.1243719478.8015.python-list@python.org>
	<627c674d-a357-4c8e-98dc-127d9f87346d@g37g2000yqn.googlegroups.com>
Message-ID: <1ca5b3ae-ba88-46ed-bd90-b8c631fdc41f@n8g2000vbb.googlegroups.com>

On May 30, 8:49?pm, John Machin <sjmac... at lexicon.net> wrote:
> ? > import time
> ? You are in a maze of twisty little functions, all alike.

Quote of the week. Perhaps the year. I hope you don't mind
me using it in the future.

Geremy Condra


From python at mrabarnett.plus.com  Sun May 31 15:41:51 2009
From: python at mrabarnett.plus.com (MRAB)
Date: Sun, 31 May 2009 20:41:51 +0100
Subject: automated web with python?
In-Reply-To: <c179782f-e5e7-4d9d-80af-f22f31deae44@y7g2000yqa.googlegroups.com>
References: <c179782f-e5e7-4d9d-80af-f22f31deae44@y7g2000yqa.googlegroups.com>
Message-ID: <4A22DD7F.2010903@mrabarnett.plus.com>

CoolGenie wrote:
> Hello,
> Recently my company changed the system. It is better for the
> management, but for us workers it is a nightmare. For example, we are
> required to enter a huge database (nested) using a web form! Make one
> mistake and you have to edit it and then use 4 mouse clicks, not
> counting the time it takes to load every web page.
> My question is: can Python somewhat relieve this pain? Maybe this web
> browser stuff could be somewhat automated... At first check it doesn't
> seem easy, since it uses authorization methods, aspx, and so on... And
> we don't have access to the underlying database, only this stupid web
> form.
> I'll appreciate any help.
> Best regards,
> Przemek

Have a look at Mechanize:

http://wwwsearch.sourceforge.net/mechanize/



From dfnsonfsduifb at gmx.de  Sun May 31 16:23:13 2009
From: dfnsonfsduifb at gmx.de (Johannes Bauer)
Date: Sun, 31 May 2009 22:23:13 +0200
Subject: Generating all combinations
Message-ID: <78g79iF1l1i8bU1@mid.dfncis.de>

Hello group,

I'm trying to write a function in Python which does the following: For a
number of arguments which are all lists, return a list (or generator)
which yields all tuples of combination. E.g:

foofunction()
# returns [ ]

foofunction([1, 2, 3])
# returns [ (1), (2), (3) ]

foofunction([1, 2, 3], ["a", "b"], ["x"])
# returns [ (1, "a", "x"), (1, "b", "x"),
            (2, "a", "x"), (2, "b", "x"),
            (3, "a", "x"), (3, "b", "x") ]

I must admit that I have no clue on how to do that efficiently (and more
importantly: in a variadic manner) in Python. Any help is appreciated!

Kind regards,
Johannes

-- 
"Meine Gegenklage gegen dich lautet dann auf bewusste Verlogenheit,
verl?sterung von Gott, Bibel und mir und bewusster Blasphemie."
         -- Prophet und Vision?r Hans Joss aka HJP in de.sci.physik
                         <48d8bf1d$0$7510$5402220f at news.sunrise.ch>


From Scott.Daniels at Acm.Org  Sun May 31 16:39:39 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 31 May 2009 13:39:39 -0700
Subject: Generating all combinations
In-Reply-To: <78g79iF1l1i8bU1@mid.dfncis.de>
References: <78g79iF1l1i8bU1@mid.dfncis.de>
Message-ID: <J8ednQSAK9M6dL_XnZ2dnUVZ_judnZ2d@pdx.net>

Johannes Bauer wrote:
> Hello group,
> 
> I'm trying to write a function in Python which does the following: For a
> number of arguments which are all lists, return a list (or generator)
> which yields all tuples of combination. E.g:

Look here:
   http://docs.python.org/library/itertools.html#itertools.product

(new in 2.6, but code works in lower versions).

--Scott David Daniels
Scott.Daniels at Acm.Org




From seattlehanks at yahoo.com  Sun May 31 16:49:07 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 13:49:07 -0700 (PDT)
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<af1d0d42-0d62-4857-9e5c-6b18b7d79891@x3g2000yqa.googlegroups.com> 
	<cf7d562c-778c-4f06-a2ce-a58561dc0dfb@h2g2000yqg.googlegroups.com> 
	<fdef7f4c-e7f2-4afa-aa72-6b1550d11c3d@f19g2000yqh.googlegroups.com> 
	<m2eiu52102.fsf@googlemail.com>
	<be36c91d-51f7-4675-8de1-63de60b1385b@n21g2000vba.googlegroups.com>
Message-ID: <eaf75582-0d22-4b31-b0e7-b8e5baa5c3b6@s21g2000vbb.googlegroups.com>

On May 31, 9:24?am, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> On May 31, 12:19?am, Arnaud Delobelle <arno... at googlemail.com> wrote:
>
>
>
> > LittleGrasshopper <seattleha... at yahoo.com> writes:
> > > On May 30, 6:15?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> > >> On May 30, 5:32?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
> > >> > On May 30, 4:01?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
> > >> > > I am experimenting with metaclasses, trying to figure out how things
> > >> > > are put together.
>
> > Have you read Guido's 'Unifying types and classes in Python 2.2' [1]? ?I
> > read it a long time ago but I remember it being very enlightening.
>
> > [1]http://www.python.org/download/releases/2.2.3/descrintro/
>
> > --
> > Arnaud
>
> I haven't actually read it, but I will now. Thanks for pointing it
> out, Arnaud.

I'm about 2/3 of the way through this paper (although I don't claim to
understand all of it.) There is some heavy duty material in there,
enough to make me feel really stupid and frustrated at times. I'm
making connections as I go though, hopefully everything will sink in
eventually.

The discussion on super(), especially the python code implementation,
clarified some of the doubts I had about how it is implemented
(including "unbound" super objects, which involve the descriptor
mechanism on the super object itself.)

Is this stuff actually tough, or am I just a dummy?


From ronn.ross at gmail.com  Sun May 31 16:55:41 2009
From: ronn.ross at gmail.com (Ronn Ross)
Date: Sun, 31 May 2009 16:55:41 -0400
Subject: RFID and Python
Message-ID: <9c8c445f0905311355i8d19fe5w62d77a49376ed8a6@mail.gmail.com>

I'm looking to play around with RFID and Python. Can anyone offer any
suggestions on the cheap? I'm possibly looking for a starter kit.
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From aahz at pythoncraft.com  Sun May 31 17:03:34 2009
From: aahz at pythoncraft.com (Aahz)
Date: 31 May 2009 14:03:34 -0700
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<m2eiu52102.fsf@googlemail.com>
	<be36c91d-51f7-4675-8de1-63de60b1385b@n21g2000vba.googlegroups.com>
	<eaf75582-0d22-4b31-b0e7-b8e5baa5c3b6@s21g2000vbb.googlegroups.com>
Message-ID: <gvurb6$ieu$1@panix3.panix.com>

In article <eaf75582-0d22-4b31-b0e7-b8e5baa5c3b6 at s21g2000vbb.googlegroups.com>,
LittleGrasshopper  <seattlehanks at yahoo.com> wrote:
>> On May 31, 12:19=A0am, Arnaud Delobelle <arno... at googlemail.com> wrote:
>>>
>>> [1]http://www.python.org/download/releases/2.2.3/descrintro/
>
>I'm about 2/3 of the way through this paper (although I don't claim to
>understand all of it.) There is some heavy duty material in there,
>enough to make me feel really stupid and frustrated at times. I'm
>making connections as I go though, hopefully everything will sink in
>eventually.
>
>Is this stuff actually tough, or am I just a dummy?

Definitely tough!  Metaclasses can cause dain bramage.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From dickinsm at gmail.com  Sun May 31 17:11:22 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sun, 31 May 2009 14:11:22 -0700 (PDT)
Subject: Generating all combinations
References: <78g79iF1l1i8bU1@mid.dfncis.de>
Message-ID: <5d89fe37-2d97-4682-b836-134997d7a048@c9g2000yqm.googlegroups.com>

On May 31, 9:23?pm, Johannes Bauer <dfnsonfsdu... at gmx.de> wrote:
> I'm trying to write a function in Python which does the following: For a
> number of arguments which are all lists, return a list (or generator)
> which yields all tuples of combination. E.g:
>
> foofunction()
> # returns [ ]

Are you sure that's what you want?  I'd expect [()] here (on the
basis that the empty product is a one-element set).  And
indeed that's what itertools.product gives:

>>> import itertools
>>> list(itertools.product())
[()]

> foofunction([1, 2, 3])
> # returns [ (1), (2), (3) ]

Presumably you mean [(1,), (2,), (3,)] here?

Mark


From mcfletch at vrplumber.com  Sun May 31 17:33:51 2009
From: mcfletch at vrplumber.com (Mike C. Fletcher)
Date: Sun, 31 May 2009 17:33:51 -0400
Subject: PyOpenGL Installation
In-Reply-To: <d76a72b7-3196-4fef-86b7-473c827dcfba@s16g2000vbp.googlegroups.com>
References: <d76a72b7-3196-4fef-86b7-473c827dcfba@s16g2000vbp.googlegroups.com>
Message-ID: <4A22F7BF.3070206@vrplumber.com>

Roastie wrote:
> The web info I have found for downloading/installing PyOpenGL and
> its dependencies for Windows is a nightmare.  Is there a place where
> all of
> the endless dependencies are packaged nicely with PyOpenGL?
>   
Hmm, "endless"?

    * Python (with ctypes, standard on everything >= 2.5)
    * OpenGL (standard on almost every Win32 machine save old Win95 boxes)

Possibly I'm missing something here?  If you just want PyOpenGL you only
need one file (the PyOpenGL package) + Python.  If you want to use it
with Numpy, you need to have numpy on the machine, same for GLUT, GLE
and the like, but they aren't required unless you want to use them. 
Heck, if you want you can even easy_install the package last I checked.

http://pyopengl.sourceforge.net/documentation/installation.html

My dictionary's definition of endless must be broken ;) :) ,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com



From btibert3 at gmail.com  Sun May 31 17:42:01 2009
From: btibert3 at gmail.com (Brock)
Date: Sun, 31 May 2009 14:42:01 -0700 (PDT)
Subject: Unzip Files
Message-ID: <09a73008-0b22-4d7e-8ca3-1a4eb235d421@e20g2000vbc.googlegroups.com>

Hi all,

I am new to python, so please don't attack me if this question is easy
or basic.  How can I go about extracting the contents of a zip file to
the same directory?  Can I extend this question to a zip file that
sits on the internet?

Point being I need to work with the files inside the zipped file, and
there are times when the file is already on my computer, and their
others where the datafile sits on the Internet.

Any help you can provide will be greatly appreciated.  In full
disclosure, I usually learn by example and not by trial and error, so
any nudges in the right direction will be greatly appreciated.

Many thanks,

Brock


From kmacphail at gmail.com  Sun May 31 18:17:59 2009
From: kmacphail at gmail.com (Kevin MacPhail)
Date: Sun, 31 May 2009 17:17:59 -0500
Subject: RFID and Python
In-Reply-To: <9c8c445f0905311355i8d19fe5w62d77a49376ed8a6@mail.gmail.com>
References: <9c8c445f0905311355i8d19fe5w62d77a49376ed8a6@mail.gmail.com>
Message-ID: <9766d5b90905311517h6eb72f26ta18dee1c175d45e8@mail.gmail.com>

On Sun, May 31, 2009 at 3:55 PM, Ronn Ross <ronn.ross at gmail.com> wrote:

> I'm looking to play around with RFID and Python. Can anyone offer any
> suggestions on the cheap? I'm possibly looking for a starter kit.
>

The Phidgets <http://www.phidgets.com> RFID starter kit sounds like it might
meet your needs.  There's at least one Python binding for the Phidgets
library that I'm aware of: http://www.lothar.com/Projects/Phidgets/

Cheers,

-K
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From thudfoo at opensuse.us  Sun May 31 18:22:49 2009
From: thudfoo at opensuse.us (member thudfoo)
Date: Sun, 31 May 2009 15:22:49 -0700
Subject: Generating all combinations
In-Reply-To: <J8ednQSAK9M6dL_XnZ2dnUVZ_judnZ2d@pdx.net>
References: <78g79iF1l1i8bU1@mid.dfncis.de>
	<J8ednQSAK9M6dL_XnZ2dnUVZ_judnZ2d@pdx.net>
Message-ID: <3d881a310905311522m51c685f2j3029c539aff745d6@mail.gmail.com>

On 5/31/09, Scott David Daniels <Scott.Daniels at acm.org> wrote:
> Johannes Bauer wrote:
>
> > Hello group,
> >
> > I'm trying to write a function in Python which does the following: For a
> > number of arguments which are all lists, return a list (or generator)
> > which yields all tuples of combination. E.g:
> >
>
>  Look here:
>
> http://docs.python.org/library/itertools.html#itertools.product
>
>  (new in 2.6, but code works in lower versions).
>

How would one go about installing the python 2.6 itertools code in python 2.5?

>  --Scott David Daniels
>  Scott.Daniels at Acm.Org
>
>
>
>  --
>  http://mail.python.org/mailman/listinfo/python-list
>


From cjns1989 at gmail.com  Sun May 31 18:23:39 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Sun, 31 May 2009 18:23:39 -0400
Subject: decoding keyboard input when using curses
In-Reply-To: <m2zlctyvj5.fsf@googlemail.com>
References: <m2vdni1fbc.fsf@googlemail.com>
	<mailman.944.1243750942.8015.python-list@python.org>
	<m2ab4t1yv3.fsf@googlemail.com>
	<mailman.951.1243789691.8015.python-list@python.org>
	<m2zlctyvj5.fsf@googlemail.com>
Message-ID: <20090531222338.GA2903@turki.gavron.org>

On Sun, May 31, 2009 at 02:30:54PM EDT, Arnaud Delobelle wrote:
> Chris Jones <cjns1989 at gmail.com> writes:

> [...]

> > Try this:
> >
> > #include <locale.h>
> > #include <ncurses.h>
> > #include <stdlib.h>
> > #include <stdio.h>
> > #include <string.h>
> 
> /* Here I need to add the following include to get wint_t on macOS X*/
> 
> #include <wctype.h>

Ah.. interesting. My posts were rather linux-centric, I must say.

Naturally, the library & header files setup on MacOS would likely
differ.

[..]

> > gcc -lncursesw uni10.c -o uni10   # different lib..
> >              ^
> 
> My machine doesn't know about libncursesw:
> 
> marigold:c arno$ ls /usr/lib/libncurses*
> /usr/lib/libncurses.5.4.dylib
> /usr/lib/libncurses.dylib
> /usr/lib/libncurses.5.dylib
> 
> So I've compiled it with libncurses as before and it works.

Nothing to complain about.. makes it even more seamless..!

> This is what I get:
> 
> If I run the program and type '?', I get a code of 'e9'.
> 
> In python:
> 
> >>> print '\xe9'.decode('latin1')
> ?
> 
> So it has been encoded using isolatin1.  I really don't understand why.
> I'll have to investigate this further.

That's why I tested both my efforts with a euro symbol that I entered
via the Compose key + E= .. which generates 0x20AC in a UTF-8 setup.

> If I change the line:
> 
>    setlocale(LC_ALL, "");                 /* make sure UTF8       */
> 
> to
> 
>    setlocale(LC_ALL, "en_GB.UTF-8");       /* make sure UTF8       */
> 
> then the behaviour is the same as before (i.e. get_wch() gets called
> twice instantly).
> 
> I'll do some more investigating (when I can think of *what* to
> investigate) and I will tell you my findings.

This is really strange.

I am absolutely certain that I had gotten my initial version, with the
old getch() .. etc. routines to work, but since I continued
experimenting with the same source snippet, I no longer had available to
investigate where I erred.

I copy/pasted the snippet back from my earlier post.. and so far I
haven't been able to get it work again.. :-(

The logic behind my assuming that getch() et al. should work
transparently in a UTF-8 context is that:

1. the 3NCURSES man pages are rather detailed and I could not find UTF-8
   or "unicode" mentioned anywhere apart from some obscure configuration
   option that is likely turned on everywhere by default.

2. More importantly, having to switch to the "wide character" macros or
   functions instead of the "narrow" versions would have meant that just
   about every application that uses ncurses would have had to be
   heavily patched - I would have imagined that all the changes would be
   made in the library in a transparent fashion so that the maintainers
   of such apps would only have had to link against the new ncurses
   lib..??? 

I'll keep you posted if I find something useful.

CJ



From clp2 at rebertia.com  Sun May 31 18:42:12 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 31 May 2009 15:42:12 -0700
Subject: Unzip Files
In-Reply-To: <09a73008-0b22-4d7e-8ca3-1a4eb235d421@e20g2000vbc.googlegroups.com>
References: <09a73008-0b22-4d7e-8ca3-1a4eb235d421@e20g2000vbc.googlegroups.com>
Message-ID: <50697b2c0905311542i7cc925dh37846b8674183709@mail.gmail.com>

On Sun, May 31, 2009 at 2:42 PM, Brock <btibert3 at gmail.com> wrote:
> Hi all,
>
> I am new to python, so please don't attack me if this question is easy
> or basic. ?How can I go about extracting the contents of a zip file to
> the same directory? ?Can I extend this question to a zip file that
> sits on the internet?
>
> Point being I need to work with the files inside the zipped file, and
> there are times when the file is already on my computer, and their
> others where the datafile sits on the Internet.
>
> Any help you can provide will be greatly appreciated. ?In full
> disclosure, I usually learn by example and not by trial and error, so
> any nudges in the right direction will be greatly appreciated.

See the extractall() method of ZipFile objects --
http://docs.python.org/library/zipfile.html

Cheers,
Chris
-- 
http://blog.rebertia.com


From python.list at tim.thechases.com  Sun May 31 18:43:45 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 31 May 2009 17:43:45 -0500
Subject: Unzip Files
In-Reply-To: <09a73008-0b22-4d7e-8ca3-1a4eb235d421@e20g2000vbc.googlegroups.com>
References: <09a73008-0b22-4d7e-8ca3-1a4eb235d421@e20g2000vbc.googlegroups.com>
Message-ID: <4A230821.7020008@tim.thechases.com>

> I am new to python, so please don't attack me if this question is easy
> or basic.  How can I go about extracting the contents of a zip file to
> the same directory?  Can I extend this question to a zip file that
> sits on the internet?

While the ZipFile object can take a file-like object, it looks 
like it expects to at least be able to seek() on that 
file-object.  The object you get back from a urlopen() call 
doesn't offer a seek(), so you can't directly use this object.

As such, you'd have to (1) download the remote .zip locally or 
(2) create your own urlopener (a'la urllib) that has a seek() 
method and uses HTTP Content-Range[1] if the server supports it. 
  Method #1 is fairly easy (especially if the file fits entirely 
within memory) but assumes the file isn't gargantuan because 
you're slurping the entire file over the network.  Method #2 
requires much crazier hacking skills but could produce serious 
gains if your file was mammoth.

> Point being I need to work with the files inside the zipped file, and
> there are times when the file is already on my computer, and their
> others where the datafile sits on the Internet.

I'd create a wrapper that checks if the passed "filename" is a 
URL or a filename.  If it's not a local file, download it to a 
local tempfile, and then proceed with that file the same as with 
the local file, only optionally deleting it when done.

Since the ZipFile can take any file-like that allows for seek(), 
memory permitting, you can even read the web-content into a 
cStringIO object without having to touch your filesystem.

-tkc

[1]
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.16





From seattlehanks at yahoo.com  Sun May 31 18:44:29 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 15:44:29 -0700 (PDT)
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<m2eiu52102.fsf@googlemail.com>
	<be36c91d-51f7-4675-8de1-63de60b1385b@n21g2000vba.googlegroups.com>
	<eaf75582-0d22-4b31-b0e7-b8e5baa5c3b6@s21g2000vbb.googlegroups.com> 
	<gvurb6$ieu$1@panix3.panix.com>
Message-ID: <433738df-e6d3-4c77-bf06-c46958002173@h2g2000yqg.googlegroups.com>

On May 31, 2:03?pm, a... at pythoncraft.com (Aahz) wrote:
> In article <eaf75582-0d22-4b31-b0e7-b8e5baa5c... at s21g2000vbb.googlegroups.com>,
>
> LittleGrasshopper ?<seattleha... at yahoo.com> wrote:
> >> On May 31, 12:19=A0am, Arnaud Delobelle <arno... at googlemail.com> wrote:
>
> >>> [1]http://www.python.org/download/releases/2.2.3/descrintro/
>
> >I'm about 2/3 of the way through this paper (although I don't claim to
> >understand all of it.) There is some heavy duty material in there,
> >enough to make me feel really stupid and frustrated at times. I'm
> >making connections as I go though, hopefully everything will sink in
> >eventually.
>
> >Is this stuff actually tough, or am I just a dummy?
>
> Definitely tough! ?Metaclasses can cause dain bramage.
> --
> Aahz (a... at pythoncraft.com) ? ? ? ? ? <*> ? ? ? ?http://www.pythoncraft.com/
>
> my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
> ? ? on-a-new-machine-ly y'rs ?- tim

Good to know, I'll stick to it and persevere. Will check doctor
regularly for dain bramage though.


From seattlehanks at yahoo.com  Sun May 31 18:52:21 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 15:52:21 -0700 (PDT)
Subject: Simple metaclass code failing
Message-ID: <41ef2397-6e9b-48b1-a818-60991244cea7@f19g2000yqo.googlegroups.com>

This is some simple code which I got from Guido's paper on the
unification of classes and types, which Arnaud suggested to improve my
knowledge of metaclasses:

class M1(type):
    pass
class M2(M1):
    pass
class M3(M2):
    pass
class C1:
    __metaclass__ = M1
class C2(C1):
    __metaclass__ = M2
class C3(C1, C2):
    __metaclass__ = M3

It is failing when processing C3:
Traceback (most recent call last):
  File "metaerror.py", line 18, in <module>
    class C3(C1, C2):
TypeError: Error when calling the metaclass bases
    Cannot create a consistent method resolution
order (MRO) for bases C2, C1

Since M3 is a subclass of M1 and M2 (which are the metaclasses for the
bases of C3, I don't understand the error. Then again, the error seems
to reference the MRO.

I hope this is one of those posts that I can look back in a few months
from now and think "Man, was that a dumb thing to ask!" Until then, I
would appreciate your help in trying to figure out what's going on.

Lukas


From seattlehanks at yahoo.com  Sun May 31 18:53:32 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 15:53:32 -0700 (PDT)
Subject: Simple metaclass code failing
References: 41ef2397-6e9b-48b1-a818-60991244cea7@f19g2000yqo.googlegroups.com
Message-ID: <16144e6c-4219-4ba2-ba6c-2da8737cbd07@g19g2000vbi.googlegroups.com>

On May 31, 3:52?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> This is some simple code which I got from Guido's paper on the
> unification of classes and types, which Arnaud suggested to improve my
> knowledge of metaclasses:
>
> class M1(type):
> ? ? pass
> class M2(M1):
> ? ? pass
> class M3(M2):
> ? ? pass
> class C1:
> ? ? __metaclass__ = M1
> class C2(C1):
> ? ? __metaclass__ = M2
> class C3(C1, C2):
> ? ? __metaclass__ = M3
>
> It is failing when processing C3:
> Traceback (most recent call last):
> ? File "metaerror.py", line 18, in <module>
> ? ? class C3(C1, C2):
> TypeError: Error when calling the metaclass bases
> ? ? Cannot create a consistent method resolution
> order (MRO) for bases C2, C1
>
> Since M3 is a subclass of M1 and M2 (which are the metaclasses for the
> bases of C3, I don't understand the error. Then again, the error seems
> to reference the MRO.
>
> I hope this is one of those posts that I can look back in a few months
> from now and think "Man, was that a dumb thing to ask!" Until then, I
> would appreciate your help in trying to figure out what's going on.
>
> Lukas

I forgot to say, this is Python 2.5.2 (in case that makes any
difference.)


From pavlovevidence at gmail.com  Sun May 31 18:59:36 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sun, 31 May 2009 15:59:36 -0700 (PDT)
Subject: Simple metaclass code failing
References: <41ef2397-6e9b-48b1-a818-60991244cea7@f19g2000yqo.googlegroups.com>
Message-ID: <991ff8ec-f38a-46db-9a40-93db8561337e@l12g2000yqo.googlegroups.com>

On May 31, 3:52?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> This is some simple code which I got from Guido's paper on the
> unification of classes and types, which Arnaud suggested to improve my
> knowledge of metaclasses:
>
> class M1(type):
> ? ? pass
> class M2(M1):
> ? ? pass
> class M3(M2):
> ? ? pass
> class C1:
> ? ? __metaclass__ = M1
> class C2(C1):
> ? ? __metaclass__ = M2
> class C3(C1, C2):
> ? ? __metaclass__ = M3
>
> It is failing when processing C3:
> Traceback (most recent call last):
> ? File "metaerror.py", line 18, in <module>
> ? ? class C3(C1, C2):
> TypeError: Error when calling the metaclass bases
> ? ? Cannot create a consistent method resolution
> order (MRO) for bases C2, C1
>
> Since M3 is a subclass of M1 and M2 (which are the metaclasses for the
> bases of C3, I don't understand the error. Then again, the error seems
> to reference the MRO.
>
> I hope this is one of those posts that I can look back in a few months
> from now and think "Man, was that a dumb thing to ask!" Until then, I
> would appreciate your help in trying to figure out what's going on.


http://www.python.org/download/releases/2.3/mro/


Carl Banks


From seattlehanks at yahoo.com  Sun May 31 19:11:56 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 16:11:56 -0700 (PDT)
Subject: Simple metaclass code failing
References: <41ef2397-6e9b-48b1-a818-60991244cea7@f19g2000yqo.googlegroups.com>
	<991ff8ec-f38a-46db-9a40-93db8561337e@l12g2000yqo.googlegroups.com>
Message-ID: <bba8de87-db5c-483e-b2b2-8a8f891830de@y9g2000yqg.googlegroups.com>

On May 31, 3:59?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 31, 3:52?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
>
>
> > This is some simple code which I got from Guido's paper on the
> > unification of classes and types, which Arnaud suggested to improve my
> > knowledge of metaclasses:
>
> > class M1(type):
> > ? ? pass
> > class M2(M1):
> > ? ? pass
> > class M3(M2):
> > ? ? pass
> > class C1:
> > ? ? __metaclass__ = M1
> > class C2(C1):
> > ? ? __metaclass__ = M2
> > class C3(C1, C2):
> > ? ? __metaclass__ = M3
>
> > It is failing when processing C3:
> > Traceback (most recent call last):
> > ? File "metaerror.py", line 18, in <module>
> > ? ? class C3(C1, C2):
> > TypeError: Error when calling the metaclass bases
> > ? ? Cannot create a consistent method resolution
> > order (MRO) for bases C2, C1
>
> > Since M3 is a subclass of M1 and M2 (which are the metaclasses for the
> > bases of C3, I don't understand the error. Then again, the error seems
> > to reference the MRO.
>
> > I hope this is one of those posts that I can look back in a few months
> > from now and think "Man, was that a dumb thing to ask!" Until then, I
> > would appreciate your help in trying to figure out what's going on.
>
> http://www.python.org/download/releases/2.3/mro/
>
> Carl Banks

Thank you, I'll read on that paper too in order to figure out what is
going on. I guess the resulting MROs do not satisfy monotonicity, I
just have to find out how to derive the MRO. I had the notion that it
was constructed by listing the current class, followed by the MROs of
each base in order, and then retaining the rightmost instance of each
class in the MRO list, but I think that might be an
oversimplification, since in this case that would be:
(C1, object)
(C2, C1, object)
(C3, C2, C1, object)
And I don't see any issues. But I'll read the paper to figure out what
the problem is, thanks.


From samwyse at gmail.com  Sun May 31 19:26:33 2009
From: samwyse at gmail.com (samwyse)
Date: Sun, 31 May 2009 16:26:33 -0700 (PDT)
Subject: How do I change the behavior of the 'python-docs' action in IDLE?
References: <166e0bf0-cb84-405c-84fb-d10abcd8d241@p4g2000vba.googlegroups.com>
Message-ID: <16b92b10-95cf-49ed-868c-8f66c8160e31@r3g2000vbp.googlegroups.com>

On Apr 16, 2:02?pm, samwyse <samw... at gmail.com> wrote:
> In the Windows version of Python 2.5, pressing F1 brought up the
> python.chm file. ?I've just installed 2.6, and the same action openshttp://www.python.org/doc/current/. ?I'd prefer the former behavior.
> I know how to change the key bindings in config-keys.def, but I think
> I want to change the action, not the key binding. ?Thanks.

I just installed Python 3.0.1 via the Windows 32-bit installer.
Opening "Python Docs" takes me to http://docs.python.org/dev/3.0/,
which doesn't exist.  Renaming python301.chm to python30.chm or
python300.chm doesn't seem to help find that file.  HELP!


From Scott.Daniels at Acm.Org  Sun May 31 19:37:17 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 31 May 2009 16:37:17 -0700
Subject: Generating all combinations
In-Reply-To: <mailman.956.1243808573.8015.python-list@python.org>
References: <78g79iF1l1i8bU1@mid.dfncis.de>	<J8ednQSAK9M6dL_XnZ2dnUVZ_judnZ2d@pdx.net>
	<mailman.956.1243808573.8015.python-list@python.org>
Message-ID: <Y_6dnRBjIqXXjr7XnZ2dnUVZ_oadnZ2d@pdx.net>

member thudfoo wrote:
> On 5/31/09, Scott David Daniels <Scott.Daniels at acm.org> wrote:
>> Johannes Bauer wrote:
>>> I'm trying to write a function in Python which ...
>>  Look here:
>>   http://docs.python.org/library/itertools.html#itertools.product
>> (new in 2.6, but code works in lower versions).
> How would one go about installing the python 2.6 itertools code in python 2.5?

Either copy the code from the documentation for itertools.product
(_very_ easy), or go to the source for 2.6 and get a copy of
.../Lib/itertools.py and save as some other name in site-packages,
and try using that (I'd use some name like itertools_26).

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at REMOVE-THIS-cybersource.com.au  Sun May 31 20:29:34 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 Jun 2009 00:29:34 GMT
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl> <m2r5y61f5y.fsf@googlemail.com>
	<m2octacim1.fsf@cs.uu.nl> <m2iqjh23jq.fsf@googlemail.com>
	<003e1491$0$9723$c3e8da3@news.astraweb.com>
	<m263fh1qdq.fsf@googlemail.com>
Message-ID: <0233137f$0$8244$c3e8da3@news.astraweb.com>

On Sun, 31 May 2009 12:08:33 +0100, Arnaud Delobelle wrote:

> Anyway, it's good to know that quicksort is O(n^2) in the worst case -
> and that this worst case can crop up very easily in some situations,
> especially if not too much care has been taken implementing it.

The naive quicksort algorithm, where you recursively split the list into 
two halves, performs badly if the list is already sorted (or nearly so). 
It's easy to fix that: randomise the list before you sort! You can do 
that with a single pass of the list. That has the advantage of ensuring 
that no specific input can cause degraded performance, so an attacker 
can't DOS your application by passing sorted lists to be sorted.

Another strategy is to randomly exchange the pivot element when sorting. 
This avoids having to do a separate pass over the list, while still 
ensuring that no particular input can cause degraded performance.

A third strategy is to use a hybrid insertion/quicksort function. This is 
probably a good idea regardless, because for small lists, the overhead of 
quicksort generally makes insertion sort faster anyway. (CPython's sort 
used to be similar: it was a hybrid insertion/samplesort until, by 
memory, version 2.2, when it was changed for Timsort.)



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Sun May 31 21:33:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 31 May 2009 22:33:13 -0300
Subject: (windows) How to get information as string from a GreenHills
	project?
References: <a84b8eba-5082-4d9a-ab75-38d1466a2eee@s12g2000yqi.googlegroups.com>
Message-ID: <op.uutjm02px6zn5v@gabriel.sleipnir-bsas>

En Sat, 30 May 2009 23:28:23 -0300, Jebel <Jebel.Star at gmail.com> escribi?:

> I use python to start a GreenHills project in command line. And the
> GreenHills project create a string which is include the information
> that needed to be analyzed. How Can I return this string from
> GreenHills project to python?

I have no idea what a GreenHills project is. But if "create a string"
means that it outputs something on screen, try the subprocess module:
http://docs.python.org/library/subprocess.html (see the very first example)

-- 
Gabriel Genellina



From samwyse at gmail.com  Sun May 31 21:50:03 2009
From: samwyse at gmail.com (samwyse)
Date: Sun, 31 May 2009 18:50:03 -0700 (PDT)
Subject: Turning HTMLParser into an iterator
Message-ID: <94817710-8bca-4cad-84f5-32d3c5d44ce7@s21g2000vbb.googlegroups.com>

I'm processing some potentially large datasets stored as HTML.  I've
subclassed HTMLParser so that handle_endtag() accumulates data into a
list, which I can then fetch when everything's done.  I'd prefer,
however, to have handle_endtag() somehow yield values while the input
data is still streaming in.  I'm sure someone's done something like
this before, but I can't figure it out.  Can anyone help?  Thanks.


From Jebel.Star at gmail.com  Sun May 31 22:02:21 2009
From: Jebel.Star at gmail.com (Jebel)
Date: Sun, 31 May 2009 19:02:21 -0700 (PDT)
Subject: (windows) How to get information as string from a GreenHills 
	project?
References: <a84b8eba-5082-4d9a-ab75-38d1466a2eee@s12g2000yqi.googlegroups.com>
	<mailman.960.1243820013.8015.python-list@python.org>
Message-ID: <24f15146-e6e2-45a9-9d20-cc3562ccd221@c9g2000yqm.googlegroups.com>

On Jun 1, 9:33?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Sat, 30 May 2009 23:28:23 -0300, Jebel <Jebel.S... at gmail.com> escribi?:
>
> > I use python to start a GreenHills project in command line. And the
> > GreenHills project create a string which is include the information
> > that needed to be analyzed. How Can I return this string from
> > GreenHills project to python?
>
> I have no idea what a GreenHills project is. But if "create a string"
> means that it outputs something on screen, try the subprocess module:http://docs.python.org/library/subprocess.html(see the very first example)
>
> --
> Gabriel Genellina

Thank you Gabriel. I resolved this problem with os.popen().
Thank you very much.
By the way, a GreenHills project means a project built by
GreenHills,:)



From seattlehanks at yahoo.com  Sun May 31 22:11:59 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 19:11:59 -0700 (PDT)
Subject: Simple metaclass code failing
References: <41ef2397-6e9b-48b1-a818-60991244cea7@f19g2000yqo.googlegroups.com>
	<991ff8ec-f38a-46db-9a40-93db8561337e@l12g2000yqo.googlegroups.com> 
	<bba8de87-db5c-483e-b2b2-8a8f891830de@y9g2000yqg.googlegroups.com>
Message-ID: <fad4b533-26ed-4e44-9f70-ab4e8df6fa93@j12g2000vbl.googlegroups.com>

On May 31, 4:11?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> On May 31, 3:59?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>
>
>
> > On May 31, 3:52?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
> > > This is some simple code which I got from Guido's paper on the
> > > unification of classes and types, which Arnaud suggested to improve my
> > > knowledge of metaclasses:
>
> > > class M1(type):
> > > ? ? pass
> > > class M2(M1):
> > > ? ? pass
> > > class M3(M2):
> > > ? ? pass
> > > class C1:
> > > ? ? __metaclass__ = M1
> > > class C2(C1):
> > > ? ? __metaclass__ = M2
> > > class C3(C1, C2):
> > > ? ? __metaclass__ = M3
>
> > > It is failing when processing C3:
> > > Traceback (most recent call last):
> > > ? File "metaerror.py", line 18, in <module>
> > > ? ? class C3(C1, C2):
> > > TypeError: Error when calling the metaclass bases
> > > ? ? Cannot create a consistent method resolution
> > > order (MRO) for bases C2, C1
>
> > > Since M3 is a subclass of M1 and M2 (which are the metaclasses for the
> > > bases of C3, I don't understand the error. Then again, the error seems
> > > to reference the MRO.
>
> > > I hope this is one of those posts that I can look back in a few months
> > > from now and think "Man, was that a dumb thing to ask!" Until then, I
> > > would appreciate your help in trying to figure out what's going on.
>
> >http://www.python.org/download/releases/2.3/mro/
>
> > Carl Banks
>
> Thank you, I'll read on that paper too in order to figure out what is
> going on. I guess the resulting MROs do not satisfy monotonicity, I
> just have to find out how to derive the MRO. I had the notion that it
> was constructed by listing the current class, followed by the MROs of
> each base in order, and then retaining the rightmost instance of each
> class in the MRO list, but I think that might be an
> oversimplification, since in this case that would be:
> (C1, object)
> (C2, C1, object)
> (C3, C2, C1, object)
> And I don't see any issues. But I'll read the paper to figure out what
> the problem is, thanks.

Thank you for pointing that paper. I read the paper and figured out
what was wrong (local precedence is not maintained.)


From samwyse at gmail.com  Sun May 31 22:40:36 2009
From: samwyse at gmail.com (samwyse)
Date: Sun, 31 May 2009 19:40:36 -0700 (PDT)
Subject: how to find the last decorator of a chain
References: <mailman.939.1243725387.8015.python-list@python.org>
Message-ID: <e83d006e-9eb2-4e34-8e37-f8726f4019e8@l12g2000yqo.googlegroups.com>

On May 30, 6:16?pm, Gabriel <gabr... at opensuse.org> wrote:

> I have something like this:
>
> @render(format="a")
> @render(format="b")
> @....
> def view(format, data):
> ? return data

> In my understanding this equivalent to:
>
> render('a',
> ?render('b',
> ? view(***)))

Not quite.  'render' is a function of one argument that returns a
decorator. So, the equivalent is more like this:
  view = render('a')(render('b')(view))
or more simply:
  fb = render('b')
  view = fb(view)
  fa = render('a')
  view = fa(view)

> Is there any way to know, in this case, that 'a' is the 'default' format?

Will this do?  (In case the formatting gets messed up, I've also
posted the code to http://python.pastebin.com/f7f229d9d)

##from functools import wraps

def render(c):
    def decorator(f):
##        @wraps(f)
        def wrapper(*args, **kwds):
            if getattr(wrapper, 'outermost', False):
                print('outer wrapper', c)
            else:
                print('inner wrapper', c)
            return f(*args, **kwds)
        return wrapper
    return decorator

def mark_as_top(f):
    print('marking', f)
    f.outermost = True
##    @wraps(f)
    return f

@mark_as_top
@render('a')
@render('b')
@render('c')
@render('d')
def f():
    pass

f()



From tjreedy at udel.edu  Sun May 31 23:04:09 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 31 May 2009 23:04:09 -0400
Subject: hash and __eq__
In-Reply-To: <0233137f$0$8244$c3e8da3@news.astraweb.com>
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>	<m2skimcp3r.fsf@cs.uu.nl>
	<m2r5y61f5y.fsf@googlemail.com>	<m2octacim1.fsf@cs.uu.nl>
	<m2iqjh23jq.fsf@googlemail.com>	<003e1491$0$9723$c3e8da3@news.astraweb.com>	<m263fh1qdq.fsf@googlemail.com>
	<0233137f$0$8244$c3e8da3@news.astraweb.com>
Message-ID: <gvvgf7$ofu$1@ger.gmane.org>

Steven D'Aprano wrote:
> On Sun, 31 May 2009 12:08:33 +0100, Arnaud Delobelle wrote:
> 
>> Anyway, it's good to know that quicksort is O(n^2) in the worst case -
>> and that this worst case can crop up very easily in some situations,
>> especially if not too much care has been taken implementing it.
> 
> The naive quicksort algorithm, where you recursively split the list into 
> two halves, performs badly if the list is already sorted (or nearly so). 
> It's easy to fix that: randomise the list before you sort! You can do 
> that with a single pass of the list. That has the advantage of ensuring 
> that no specific input can cause degraded performance, so an attacker 
> can't DOS your application by passing sorted lists to be sorted.
> 
> Another strategy is to randomly exchange the pivot element when sorting. 
> This avoids having to do a separate pass over the list, while still 
> ensuring that no particular input can cause degraded performance.
> 
> A third strategy is to use a hybrid insertion/quicksort function. This is 
> probably a good idea regardless, because for small lists, the overhead of 
> quicksort generally makes insertion sort faster anyway. (CPython's sort 
> used to be similar: it was a hybrid insertion/samplesort until, by 
> memory, version 2.2, when it was changed for Timsort.

Which is hybrid binary insertion sort and mergesort, with b.i.s used for 
sublists less than 64 items.




From goldwamh at slu.edu  Sun May 31 23:28:12 2009
From: goldwamh at slu.edu (Michael H. Goldwasser)
Date: Sun, 31 May 2009 22:28:12 -0500
Subject: [Tutor] Challenge supporting custom deepcopy with inheritance
In-Reply-To: <1c2a2c590905311858x4fa7ec79t5a876c45b78ad6a1@mail.gmail.com>
References: <18978.63514.319199.287551@Michael-Goldwassers-Computer.local>
	<1c2a2c590905311858x4fa7ec79t5a876c45b78ad6a1@mail.gmail.com>
	<18978.5438.755496.633709@Michael-Goldwassers-Computer.local>
Message-ID: <18979.19148.208649.805972@Michael-Goldwassers-Computer.local>


Hi Kent,

Thanks for your thoughts. 

For the original example code, you are correct that we could make it
work by having B provide the one-arg constructor to match A's
constructor signature.  But I don't see this as a general solution.

Having B.__deepcopy__() make a call to A.__deepcopy__() assumes that A
supports __deepcopy__ either direclty or indirectly.  This is not
guaranteed as __deepcopy__ is not supported all the way back to the
object base class.  It could be that the author of A has guaranteed
that the syntax deepcopy(instanceA) is properly supported, but that
could be done by other means without an explicit __deepcopy__ (such as
relying on a true deep copy, or using getstate/setstate to affect both
pickling and deepcopy).

As another basic puzzle, consider a class definition for B where B has
a registry list that it doesn't want cloned for the new instance (but
it does want pickled when serialized).  This would seem to require
that B implement its own __deepcopy__.   We want to somehow rely on
the class definition for A to enact the cloning fo the state defined
by A.   But without knowing about how A supports the deepcopy
semantics, I don't see how to accomplish this goal.

class B(A):
    def __init__(self):
        self.__registry = []

    def register(self, obj):
        self.__registry.append(obj)

    def __deepcopy__(self, memo={}):
        dup =  ????     # would like something like A's version of deepcopy(self,memo)
                        # as our starting point but we need an instance of class B
                        # and B.__deepcopy__ masks our ability to rely on the
                        # inherited semantics of deepcopy(self)
        dup.__registry = []
        memo[id(self)] = dup
        return dup


On Sunday May 31, 2009, Kent Johnson wrote: 

>    On Sun, May 31, 2009 at 5:35 PM, Michael H. Goldwasser <goldwamh at slu.edu> wrote:
>    >
>    > Yesterday, I posted a question to python-list involving custom
>    > deepcopies in an inheritance hierarchy. ?I haven't received any
>    > responses, so I thought I'd cross-post to see if anyone on tutor
>    > has any thoughts.
>    >
>    > To avoid splitting the thread, I'll simply reference the original post at
>    > http://mail.python.org/pipermail/python-list/2009-May/714866.html
>    > and ask for responses to be sent there.
>    
>    Sorry, splitting the thread for you...
>    
>    ISTM that in general B.__deepcopy__() should call A.__deepcopy__() to
>    do the "A" part of the work. In your example, this won't work because
>    A.__deepcopy__() assumes that subclasses have a one-argument
>    constructor. So, I would say that B is not fulfilling the contract
>    assumed by A.
>    
>    What if you give B a one-arg constructor by making the bTag argument
>    optional? Then I think B.__deepcopy__() can call A.__deepcopy__(),
>    then do the "B" part of the copy on the result.
>    
>    Kent


       +-----------------------------------------------
       | Michael Goldwasser
       | Associate Professor
       | Dept. Mathematics and Computer Science
       | Saint Louis University
       | 220 North Grand Blvd.
       | St. Louis, MO 63103-2007
       |
       | Office: Ritter Hall 6
       | Email:  goldwamh at slu.edu
       | URL:    http://cs.slu.edu/~goldwasser
       | Phone:  (314) 977-7039
       | Fax:    (314) 977-1452



From soumen08 at gmail.com  Fri May  1 00:00:08 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Fri, 1 May 2009 09:30:08 +0530
Subject: wxPython having trouble with frame objects
In-Reply-To: <f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com>
References: <mailman.4886.1241142872.11746.python-list@python.org>
	<5ddd5a7f-8c2b-4f39-a89e-376a3d646caf@t36g2000prt.googlegroups.com>
	<f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com>
Message-ID: <f6a09c160904302100j6782efdfl8eaf41441c06a0e7@mail.gmail.com>

Hello,
Another thing, here i tried changing self.frame_1 to
guithread.frame_1, so that that part of the code now reads:-

import wx,gui,threading
class guithread(threading.Thread):
    def run(self):
        app = wx.PySimpleApp(0)
        wx.InitAllImageHandlers()
        guithread.frame_1 = gui.MyFrame(None, -1, "")
        app.SetTopWindow(guithread.frame_1)
        guithread.frame_1.Show()
        app.MainLoop()
gui1=guithread()
gui1.start()
class changer(threading.Thread):
    def run(self):
        gui1.frame_1.text_ctrl_1.Setvalue("hello")
chang=changer()
chang.start()

I still get guithread object has no attribute frame_1. I must be doing
something wrong

On Fri, May 1, 2009 at 9:27 AM, Soumen banerjee <soumen08 at gmail.com> wrote:
> Hello,
> you say that ?frame_1 is an attribute of the main class. The main
> class here is guithread right? so any instance of guithread should
> also have an attribute called frame_1 isnt it? Excuse me if im getting
> this wrong, since i am somewhat new to python.
> Regards
> Soumen
>
> On Fri, May 1, 2009 at 9:05 AM, CM <cmpython at gmail.com> wrote:
>> On Apr 30, 9:54?pm, Soumen banerjee <soume... at gmail.com> wrote:
>>> Hello,
>>> I am using wxglade to design a gui which i am using in another script.
>>> Here are the codes
>>>
>>> The main file:
>>> import wx,gui,threading
>>> class guithread(threading.Thread):
>>> ? ?def run(self):
>>> ? ? ? ?app = wx.PySimpleApp(0)
>>> ? ? ? ?wx.InitAllImageHandlers()
>>> ? ? ? ?self.frame_1 = gui.MyFrame(None, -1, "")
>>> ? ? ? ?app.SetTopWindow(self.frame_1)
>>> ? ? ? ?self.frame_1.Show()
>>> ? ? ? ?app.MainLoop()
>>> gui1=guithread()
>>> gui1.start()
>>> class changer(threading.Thread):
>>> ? ?def run(self):
>>> ? ? ? ?gui1.frame_1.text_ctrl_1.Setvalue("hello")
>>> chang=changer()
>>> chang.start()
>>>
>>> and The GUI file (gui.py, imported in the above)
>>> import wx
>>>
>>> # begin wxGlade: extracode
>>> # end wxGlade
>>>
>>> class MyFrame(wx.Frame):
>>> ? ?def __init__(self, *args, **kwds):
>>> ? ? ? ?# begin wxGlade: MyFrame.__init__
>>> ? ? ? ?kwds["style"] = wx.DEFAULT_FRAME_STYLE
>>> ? ? ? ?wx.Frame.__init__(self, *args, **kwds)
>>> ? ? ? ?self.text_ctrl_1 = wx.TextCtrl(self, -1, "")
>>> ? ? ? ?self.slider_1 = wx.Slider(self, -1, 0, 0, 10)
>>> ? ? ? ?self.Open = wx.Button(self, -1, "Open")
>>> ? ? ? ?self.button_4 = wx.Button(self, -1, "Pause/Resume")
>>> ? ? ? ?self.button_5 = wx.Button(self, -1, "Quit")
>>>
>>> ? ? ? ?self.__set_properties()
>>> ? ? ? ?self.__do_layout()
>>>
>>> ? ? ? ?self.Bind(wx.EVT_COMMAND_SCROLL, self.slider, self.slider_1)
>>> ? ? ? ?self.Bind(wx.EVT_BUTTON, self.open, self.Open)
>>> ? ? ? ?self.Bind(wx.EVT_BUTTON, self.pause, self.button_4)
>>> ? ? ? ?self.Bind(wx.EVT_BUTTON, self.quit, self.button_5)
>>> ? ? ? ?# end wxGlade
>>>
>>> ? ?def __set_properties(self):
>>> ? ? ? ?# begin wxGlade: MyFrame.__set_properties
>>> ? ? ? ?self.SetTitle("frame_1")
>>> ? ? ? ?self.SetSize((522, 457))
>>> ? ? ? ?# end wxGlade
>>>
>>> ? ?def __do_layout(self):
>>> ? ? ? ?# begin wxGlade: MyFrame.__do_layout
>>> ? ? ? ?sizer_1 = wx.BoxSizer(wx.VERTICAL)
>>> ? ? ? ?sizer_2 = wx.BoxSizer(wx.VERTICAL)
>>> ? ? ? ?sizer_3 = wx.BoxSizer(wx.HORIZONTAL)
>>> ? ? ? ?sizer_2.Add(self.text_ctrl_1, 7, wx.EXPAND, 0)
>>> ? ? ? ?sizer_2.Add(self.slider_1, 0, wx.EXPAND, 0)
>>> ? ? ? ?sizer_3.Add(self.Open, 0, wx.LEFT, 70)
>>> ? ? ? ?sizer_3.Add((52, 20), 0, 0, 0)
>>> ? ? ? ?sizer_3.Add(self.button_4, 0, wx.ALIGN_CENTER_HORIZONTAL, 0)
>>> ? ? ? ?sizer_3.Add((55, 23), 0, 0, 0)
>>> ? ? ? ?sizer_3.Add(self.button_5, 0, 0, 0)
>>> ? ? ? ?sizer_2.Add(sizer_3, 1, wx.EXPAND, 0)
>>> ? ? ? ?sizer_1.Add(sizer_2, 1, wx.EXPAND, 0)
>>> ? ? ? ?self.SetSizer(sizer_1)
>>> ? ? ? ?self.Layout()
>>> ? ? ? ?# end wxGlade
>>>
>>> ? ?def slider(self, event): # wxGlade: MyFrame.<event_handler>
>>> ? ? ? ?print "Event handler `slider' not implemented!"
>>> ? ? ? ?event.Skip()
>>>
>>> ? ?def open(self, event): # wxGlade: MyFrame.<event_handler>
>>> ? ? ? ?print "Event handler `open' not implemented!"
>>> ? ? ? ?event.Skip()
>>>
>>> ? ?def pause(self, event): # wxGlade: MyFrame.<event_handler>
>>> ? ? ? ?print "Event handler `pause' not implemented!"
>>> ? ? ? ?event.Skip()
>>>
>>> ? ?def quit(self, event): # wxGlade: MyFrame.<event_handler>
>>> ? ? ? ?print "Event handler `quit' not implemented!"
>>> ? ? ? ?event.Skip()
>>>
>>> # end of class MyFrame
>>>
>>> if __name__ == "__main__":
>>> ? ?app = wx.PySimpleApp(0)
>>> ? ?wx.InitAllImageHandlers()
>>> ? ?frame_1 = MyFrame(None, -1, "")
>>> ? ?app.SetTopWindow(frame_1)
>>> ? ?frame_1.Show()
>>> ? ?app.MainLoop()
>>>
>>> The problem here is that when i run the main file, i am told that
>>> 'guithread' object has no attribute 'frame_1' whereas i seem to have
>>> defined
>>> self.frame_1=gui.MyFrame etc.
>>
>> Your statement above means that self--that is, the instance of
>> your main class--has an attribute called frame_1, and that name
>> refers to an instance of the MyFrame class from the gui module.
>>
>> It does not mean that the guithread object has an attribute named
>> frame_1. ?In order to do that, you should have written:
>>
>> guithread.frame_1 = something
>>
>>> The idea here is to access a gui element running in a thread from a
>>> separate thread. Please help
>>
>> I would post wxPython related questions on the wxPython mailing
>> list, which is excellent.
>> http://www.wxpython.org/maillist.php
>>
>> HTH,
>> Che
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>


From ldo at geek-central.gen.new_zealand  Fri May  1 00:30:19 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 01 May 2009 16:30:19 +1200
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz>
	<49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
Message-ID: <gtdtsr$qv1$3@lust.ihug.co.nz>

In message <pan.2009.04.30.00.29.35 at REMOVE.THIS.cybersource.com.au>, Steven 
D'Aprano wrote:

> The reason why Lawrence's insistence is so badly wrong becomes more
> apparent if you look at what you can do with boolean contexts other than
> simple `if` tests. Compare:
> 
> 
> for x in a or b or c:
>     do_something_with(x)
> 
> 
> versus:
> 
> 
> if len(a) > 0:
>     temp = a
> elif len(b) > 0:
>     temp = b
> elif len(c) > 0:
>     temp = c
> for x in temp:
>     do_something_with(x)

I have never written anything so unbelievable in my life. And I hope I never 
will.



From davea at ieee.org  Fri May  1 00:52:52 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 01 May 2009 00:52:52 -0400
Subject: wxPython having trouble with frame objects
In-Reply-To: <f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com>
References: <mailman.4886.1241142872.11746.python-list@python.org>	<5ddd5a7f-8c2b-4f39-a89e-376a3d646caf@t36g2000prt.googlegroups.com>
	<f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com>
Message-ID: <49FA8024.3060608@ieee.org>

Soumen banerjee wrote:
> Hello,
> you say that  frame_1 is an attribute of the main class. The main
> class here is guithread right? so any instance of guithread should
> also have an attribute called frame_1 isnt it? Excuse me if im getting
> this wrong, since i am somewhat new to python.
> Regards
> Soumen
>
> On Fri, May 1, 2009 at 9:05 AM, CM <cmpython at gmail.com> wrote:
>   
>> On Apr 30, 9:54 pm, Soumen banerjee <soume... at gmail.com> wrote:
>>     
>>> Hello,
>>> I am using wxglade to design a gui which i am using in another script.
>>> Here are the codes
>>>
>>> The main file:
>>> import wx,gui,threading
>>> class guithread(threading.Thread):
>>>    def run(self):
>>>        app =x.PySimpleApp(0)
>>>        wx.InitAllImageHandlers()
>>>        self.frame_1 =ui.MyFrame(None, -1, "")
>>>        app.SetTopWindow(self.frame_1)
>>>        self.frame_1.Show()
>>>        app.MainLoop()
>>> gui1=ithread()
>>> gui1.start()
>>> class changer(threading.Thread):
>>>    def run(self):
>>>        gui1.frame_1.text_ctrl_1.Setvalue("hello")
>>> chang=anger()
>>> chang.start()
>>>
>>> and The GUI file (gui.py, imported in the above)
>>> import wx
>>>
>>> # begin wxGlade: extracode
>>> # end wxGlade
>>>
>>> class MyFrame(wx.Frame):
>>>    def __init__(self, *args, **kwds):
>>>        # begin wxGlade: MyFrame.__init__
>>>        kwds["style"] =x.DEFAULT_FRAME_STYLE
>>>        wx.Frame.__init__(self, *args, **kwds)
>>>        self.text_ctrl_1 =x.TextCtrl(self, -1, "")
>>>        self.slider_1 =x.Slider(self, -1, 0, 0, 10)
>>>        self.Open =x.Button(self, -1, "Open")
>>>        self.button_4 =x.Button(self, -1, "Pause/Resume")
>>>        self.button_5 =x.Button(self, -1, "Quit")
>>>
>>>        self.__set_properties()
>>>        self.__do_layout()
>>>
>>>        self.Bind(wx.EVT_COMMAND_SCROLL, self.slider, self.slider_1)
>>>        self.Bind(wx.EVT_BUTTON, self.open, self.Open)
>>>        self.Bind(wx.EVT_BUTTON, self.pause, self.button_4)
>>>        self.Bind(wx.EVT_BUTTON, self.quit, self.button_5)
>>>        # end wxGlade
>>>
>>>    def __set_properties(self):
>>>        # begin wxGlade: MyFrame.__set_properties
>>>        self.SetTitle("frame_1")
>>>        self.SetSize((522, 457))
>>>        # end wxGlade
>>>
>>>    def __do_layout(self):
>>>        # begin wxGlade: MyFrame.__do_layout
>>>        sizer_1 =x.BoxSizer(wx.VERTICAL)
>>>        sizer_2 =x.BoxSizer(wx.VERTICAL)
>>>        sizer_3 =x.BoxSizer(wx.HORIZONTAL)
>>>        sizer_2.Add(self.text_ctrl_1, 7, wx.EXPAND, 0)
>>>        sizer_2.Add(self.slider_1, 0, wx.EXPAND, 0)
>>>        sizer_3.Add(self.Open, 0, wx.LEFT, 70)
>>>        sizer_3.Add((52, 20), 0, 0, 0)
>>>        sizer_3.Add(self.button_4, 0, wx.ALIGN_CENTER_HORIZONTAL, 0)
>>>        sizer_3.Add((55, 23), 0, 0, 0)
>>>        sizer_3.Add(self.button_5, 0, 0, 0)
>>>        sizer_2.Add(sizer_3, 1, wx.EXPAND, 0)
>>>        sizer_1.Add(sizer_2, 1, wx.EXPAND, 0)
>>>        self.SetSizer(sizer_1)
>>>        self.Layout()
>>>        # end wxGlade
>>>
>>>    def slider(self, event): # wxGlade: MyFrame.<event_handler>
>>>        print "Event handler `slider' not implemented!"
>>>        event.Skip()
>>>
>>>    def open(self, event): # wxGlade: MyFrame.<event_handler>
>>>        print "Event handler `open' not implemented!"
>>>        event.Skip()
>>>
>>>    def pause(self, event): # wxGlade: MyFrame.<event_handler>
>>>        print "Event handler `pause' not implemented!"
>>>        event.Skip()
>>>
>>>    def quit(self, event): # wxGlade: MyFrame.<event_handler>
>>>        print "Event handler `quit' not implemented!"
>>>        event.Skip()
>>>
>>> # end of class MyFrame
>>>
>>> if __name__ ="__main__":
>>>    app =x.PySimpleApp(0)
>>>    wx.InitAllImageHandlers()
>>>    frame_1 =yFrame(None, -1, "")
>>>    app.SetTopWindow(frame_1)
>>>    frame_1.Show()
>>>    app.MainLoop()
>>>
>>> The problem here is that when i run the main file, i am told that
>>> 'guithread' object has no attribute 'frame_1' whereas i seem to have
>>> defined
>>> self.frame_1=i.MyFrame etc.
>>>       
>> Your statement above means that self--that is, the instance of
>> your main class--has an attribute called frame_1, and that name
>> refers to an instance of the MyFrame class from the gui module.
>>
>> It does not mean that the guithread object has an attribute named
>> frame_1.  In order to do that, you should have written:
>>
>> guithread.frame_1 =omething
>>
>>     
>>> The idea here is to access a gui element running in a thread from a
>>> separate thread. Please help
>>>       
>> I would post wxPython related questions on the wxPython mailing
>> list, which is excellent.
>> http://www.wxpython.org/maillist.php
>>
>> HTH,
>> Che
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>     
Don't top-post. It puts things entirely out of order. Now the order of 
the parts of this message are 3, 1, 2, 4

Two things at least are wrong here, either of which is fatal.
   1) you have two threads doing GUI stuff.  Can't be done, at least not in wxPython.  Certain things can be done in a second thread, but definitely not constructing Frames and such.
   2) you have no synchronization between the two threads you start, so the changer thread may very well get to its usage of frame_1 long before guithread assigns it.  This is probably the cause of your current symptom.  Now, you could perhaps "fix" it by assigning it something in the guithread constructor (you don't define one), but although that'd get you further, problem #1 is fatal.





From rcdailey at gmail.com  Fri May  1 01:09:15 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Thu, 30 Apr 2009 22:09:15 -0700 (PDT)
Subject: subprocess & shared environments
Message-ID: <8c79f749-e648-4a2e-afad-4053a8ec5cbd@f41g2000pra.googlegroups.com>

I'm currently calling subprocess.call() on a batch file (in Windows)
that sets a few environment variables that are needed by further
processes started via subprocess.call(). How can I persist the
environment modifications by the first call() function? I've done my
own searching on this and I came up with nothing.

Help is appreciated.


From soumen08 at gmail.com  Fri May  1 01:12:43 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Fri, 1 May 2009 10:42:43 +0530
Subject: wxPython having trouble with frame objects
In-Reply-To: <49FA8024.3060608@ieee.org>
References: <mailman.4886.1241142872.11746.python-list@python.org>
	<5ddd5a7f-8c2b-4f39-a89e-376a3d646caf@t36g2000prt.googlegroups.com>
	<f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com>
	<49FA8024.3060608@ieee.org>
Message-ID: <f6a09c160904302212p7b9bb797m4e6942c2de12e10a@mail.gmail.com>

Hello,
Im not adding any GUI elements from the changer thread. Im just
attempting to change the value of a preexisting widget made in thread
one. The point is that i need to display text generated in thread 2 in
a GUI generated in thread 1.
As far as inter thread synchronization is concerned, i see your point.
So i took this approach

import wx,gui,threading
fix=0
i=1
class guithread(threading.Thread):
    def run(self):
        global fix
        app = wx.PySimpleApp(0)
        wx.InitAllImageHandlers()
        guithread.frame_1 = gui.MyFrame(None, -1, "")
        app.SetTopWindow(guithread.frame_1)
        guithread.frame_1.Show()
        print "setting fix"
        fix=1
        app.MainLoop()
gui1=guithread()
gui1.start()
class changer(threading.Thread):
    def run(self):
        print fix
        gui1.frame_1.text_ctrl_1.SetValue("hello")
print fix
while i:
    if fix == 1:
        print "starting changer"
        chang=changer()
        chang.start()
        i=0
This works, but is there anything simpler?
Regards
Soumen


From cs at zip.com.au  Fri May  1 01:22:26 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 1 May 2009 15:22:26 +1000
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <20090430223744.GA26332@cskk.homeip.net>
Message-ID: <20090501052226.GA6860@cskk.homeip.net>

On 01May2009 08:37, I wrote:
| On 30Apr2009 22:57, MRAB <google at mrabarnett.plus.com> wrote:
| > The producer could send just one None to indicate that it has finished
| > producing.
| > Each consumer could get the data from the queue, but if it's None then
| > put it back in the queue for the other consumer, then clean up and
| > finish.
| > When all the consumers have finished, the queue will contain just the
| > single None.
| 
| And as it happens I have an IterableQueue class right here which does
| _exact_ what was just described. You're welcome to it if you like.
| Added bonus is that, as the name suggests, you can use the class as
| an iterator:
|   for item in iterq:
|     ...
| The producer calls iterq.close() when it's done.

Someone asked, so code appended below.

Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

class IterableQueue(Queue): 
  ''' A Queue obeying the iterator protocol.
      Note: Iteration stops when a None comes off the Queue.
  '''

  def __init__(self, *args, **kw):
    ''' Initialise the queue.
    '''
    Queue.__init__(self, *args, **kw)
    self.__closed=False

  def put(self, item, *args, **kw):
    ''' Put an item on the queue.
    '''
    assert not self.__closed, "put() on closed IterableQueue"
    assert item is not None, "put(None) on IterableQueue"
    return Queue.put(self, item, *args, **kw)

  def _closeAtExit(self):
    if not self.__closed:
      self.close()

  def close(self):
    ##logFnLine("%s.close()"%(self,),frame=sys._getframe(1))
    if self.__closed:
      # this should be a real log message
      print >>sys.stderr, "close() on closed IterableQueue"
    else:
      self.__closed=True
      Queue.put(self,None)

  def __iter__(self):
    ''' Iterable interface for the queue.
    '''
    return self

  def next(self):
    item=self.get()
    if item is None:
      Queue.put(self,None)      # for another iterator
      raise StopIteration
    return item


From st1999 at gmail.com  Fri May  1 01:26:44 2009
From: st1999 at gmail.com (robean)
Date: Thu, 30 Apr 2009 22:26:44 -0700 (PDT)
Subject: urllib2 and threading
Message-ID: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>

I am writing a program that involves visiting several hundred webpages
and extracting specific information from the contents. I've written a
modest 'test' example here that uses a multi-threaded approach to
reach the urls with urllib2. The actual program will involve fairly
elaborate scraping and parsing (I'm using Beautiful Soup for that) but
the example shown here is simplified and just confirms the url of the
site visited.

Here's the problem: the script simply crashes after getting a a couple
of urls and takes a long time to run (slower that a non-threaded
version that I wrote and ran). Can anyone figure out what I am doing
wrong? I am new to both threading and urllib2, so its possible that
the SNAFU is quite obvious.

The urls are stored in a text file that I read from. The urls are all
valid, so there's no problem there.

Here's the code:

#!/usr/bin/python

import urllib2
import threading

class MyThread(threading.Thread):
  """subclass threading.Thread to create Thread instances"""
  def __init__(self, func, args):
    threading.Thread.__init__(self)
    self.func = func
    self.args = args

  def run(self):
    apply(self.func, self.args)


def get_info_from_url(url):
  """ A dummy version of the function simply visits urls and prints
the url of the page. """
  try:
    page = urllib2.urlopen(url)
  except urllib2.URLError, e:
    print "**** error ****", e.reason
  except urllib2.HTTPError, e:
    print "**** error ****", e.code

  else:
    ulock.acquire()
    print page.geturl() # obviously, do something more useful here,
eventually
    page.close()
    ulock.release()

ulock = threading.Lock()
num_links = 10
threads = [] # store threads here
urls = [] # store urls here

fh = open("links.txt", "r")
for line in fh:
  urls.append(line.strip())
fh.close()

# collect threads
for i in range(num_links):
  t = MyThread(get_info_from_url, (urls[i],) )
  threads.append(t)

# start the threads
for i in range(num_links):
  threads[i].start()

for i in range(num_links):
  threads[i].join()

print "all done"



From smichr at gmail.com  Fri May  1 02:13:54 2009
From: smichr at gmail.com (smichr)
Date: Thu, 30 Apr 2009 23:13:54 -0700 (PDT)
Subject: Modifying the value of a float-like object
References: <e89aa215-d9df-4159-8d0d-245ffb8f755a@u8g2000yqn.googlegroups.com>
	<pan.2009.04.15.03.35.14@REMOVE.THIS.cybersource.com.au>
	<87iql6v9cr.fsf@benfinney.id.au> 
	<aef29098-9d94-4f24-b246-a1806f0a9e32@v15g2000yqn.googlegroups.com> 
	<m2fxgakwqk.fsf@googlemail.com>
	<142274a6-a8f5-49ae-8b99-46d4dbe31246@e21g2000yqb.googlegroups.com>
	<m2bpqykk3h.fsf@googlemail.com>
	<ed232d90-1766-4745-bd57-2abcca10dfc4@z9g2000yqi.googlegroups.com>
Message-ID: <e084fd7b-e602-4ae2-af3b-80ac6bef958b@y34g2000prb.googlegroups.com>

On Apr 18, 4:21 pm, Eric.Le.Bi... at spectro.jussieu.fr wrote:
> On Apr 15, 5:33 pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
>
> I adjusted your code in a few ways, and put the result athttp://code.activestate.com/recipes/576721/(with due credit):
>
> 1) There was a strange behavior, which is fixed (by performing only
> dynamic calculations of UExpr, with an optimization through a new
> "constant" class):
>

Although normal arithmetic operations are correlated, the correlation
is lost (AFAICT) as soon as you use a function:

>>> a=Number_with_uncert(3,1);y=a+cos(a);y.error
1.0099083406911706
>>> #check it manually
>>> def f(a):
... 	return a+cos(a)
...
>>> h=1e-5;print (f(3+h)-f(3))/h
0.858884941879
>>> #check it analytically
>>> 1-sin(3)
0.85887999194013276

It's effectively creating a new variable, tmp=cos(a) so y looks like a
+tmp and the uncertainty in this is (a.error**2 + tmp.error**2)**.5:
>>> a
<class '__main__.Semi_formal_var'> object with result 3.0 +- 1
>>> cos(a)
<class '__main__.Semi_formal_var'> object with result -0.9899924966 +-
0.14112000806
>>> (1+0.14112000806**2)**.5
1.009908340729422

That result we got when requesting the error in y
We can also see that the a inside the cos() is invisible by taking the
derivative wrt a

>>> y.derivative_value(a)
0.99999999996214217

Also, this approach is limited in that only variables can be arguments
to functions, not node expressions. If x and d are variables, x/d
becomes an expression and you cannot compute sin(x/d). Or am I missing
something?

/c


From arnodel at googlemail.com  Fri May  1 02:24:42 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 01 May 2009 07:24:42 +0100
Subject: import and package confusion
References: <VYWdnUS5ddMkAmXUnZ2dnUVZ_tGdnZ2d@pdx.net>
	<20090429193621.GO32190@vnl.com> <49F8B4B1.4040705@Acm.Org>
	<20090429203403.GA4324@vnl.com> <49F8CF55.30705@Acm.Org>
	<mailman.4792.1241044312.11746.python-list@python.org>
	<_rOdnY_h8uTTQWXUnZ2dnUVZ_gKdnZ2d@pdx.net>
	<20090430001954.GC8373@vnl.com>
	<20090430063231.GI9749@nexus.in-nomine.org>
	<20090430140557.GA31415@vnl.com>
	<mailman.4852.1241102169.11746.python-list@python.org>
Message-ID: <m2eiv95oid.fsf@googlemail.com>

Dale Amon <amon at vnl.com> writes:

> Now I can move on to parsing those pesky Fortran card
> images... There wouldn't happen to be a way to take n
> continguous slices from a string (card image) where each 
> slice may be a different length would there? Fortran you 
> know. No spaces between input fields. :-)
>
> I know a way to do it, iterating over a list of slice sizes,
> perhaps in a list comprehension, but some of the august python 
> personages here no doubt know better ways.

It's a challenge to do it in a list comprehension, but here it is!

Warning: unpythonic code follows(*).  Sensitive readers may want to look
away now.

>>> data
'AAABBBBBCCCCCCCCCDD'
>>> field_sizes
[3, 5, 9, 2]
>>> [data[i:j] for j in [0] for s in field_sizes for i, j in [(j, j+s)]]
['AAA', 'BBBBB', 'CCCCCCCCC', 'DD']
>>> 

Now you can look again.

(*) Pythonicity is often much debated as it lies for a good part in the
eye of the snake charmer.  I don't think this snippet would generate
much debate!

-- 
Arnaud


From arnodel at googlemail.com  Fri May  1 02:28:51 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 01 May 2009 07:28:51 +0100
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
Message-ID: <m2ab5x5obg.fsf@googlemail.com>

Ross <ross.jett at gmail.com> writes:

> If I have a list of tuples a = [(1,2), (3,4), (5,6)], and I want to
> return a new list of each individual element in these tuples, I can do
> it with a nested for loop but when I try to do it using the list
> comprehension b = [j for j in i for i in a], my output is b =
> [5,5,5,6,6,6] instead of the correct b = [1,2,3,4,5,6]. What am I
> doing wrong?

When writing nested list comprehension, the for loops are in the same
order as you would write a normal nested for loop (which is not
necessarily intuitive when you first find out but is very handy in the
long run I think).

So write:

    [j for i in a for j in i]

-- 
Arnaud


From wuwei23 at gmail.com  Fri May  1 03:00:29 2009
From: wuwei23 at gmail.com (alex23)
Date: Fri, 1 May 2009 00:00:29 -0700 (PDT)
Subject: import and package confusion
References: <VYWdnUS5ddMkAmXUnZ2dnUVZ_tGdnZ2d@pdx.net>
	<20090429193621.GO32190@vnl.com> 
	<49F8B4B1.4040705@Acm.Org> <20090429203403.GA4324@vnl.com> 
	<49F8CF55.30705@Acm.Org>
	<mailman.4792.1241044312.11746.python-list@python.org> 
	<_rOdnY_h8uTTQWXUnZ2dnUVZ_gKdnZ2d@pdx.net>
	<20090430001954.GC8373@vnl.com> 
	<20090430063231.GI9749@nexus.in-nomine.org>
	<20090430140557.GA31415@vnl.com> 
	<mailman.4852.1241102169.11746.python-list@python.org>
	<m2eiv95oid.fsf@googlemail.com>
Message-ID: <11bee2fa-5a39-4f17-98d3-a6c1d5780b5d@s38g2000prg.googlegroups.com>

On May 1, 4:24?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
> It's a challenge to do it in a list comprehension, but here it is!
> >>> data
> 'AAABBBBBCCCCCCCCCDD'
> >>> field_sizes
> [3, 5, 9, 2]
> >>> [data[i:j] for j in [0] for s in field_sizes for i, j in [(j, j+s)]]
> ['AAA', 'BBBBB', 'CCCCCCCCC', 'DD']

Ugh. I know using a listcomp was the point but I find using struct so
much more elegant.

>>> import struct
>>> data = 'AAABBBBBCCCCCCCCCDD'
>>> format = '3s5s9s2s'
>>> struct.unpack(format, data)
('AAA', 'BBBBB', 'CCCCCCCCC', 'DD')

Friends don't let friends abuse list comprehensions.

I made sure the code works this time :)


From smichr at gmail.com  Fri May  1 03:19:43 2009
From: smichr at gmail.com (smichr)
Date: Fri, 1 May 2009 00:19:43 -0700 (PDT)
Subject: Modifying the value of a float-like object
References: <e89aa215-d9df-4159-8d0d-245ffb8f755a@u8g2000yqn.googlegroups.com>
	<pan.2009.04.15.03.35.14@REMOVE.THIS.cybersource.com.au>
	<87iql6v9cr.fsf@benfinney.id.au> 
	<aef29098-9d94-4f24-b246-a1806f0a9e32@v15g2000yqn.googlegroups.com> 
	<m2fxgakwqk.fsf@googlemail.com>
	<142274a6-a8f5-49ae-8b99-46d4dbe31246@e21g2000yqb.googlegroups.com>
	<m2bpqykk3h.fsf@googlemail.com>
	<ed232d90-1766-4745-bd57-2abcca10dfc4@z9g2000yqi.googlegroups.com>
	<e084fd7b-e602-4ae2-af3b-80ac6bef958b@y34g2000prb.googlegroups.com>
Message-ID: <269a0614-ffd4-4012-a9a0-e6ec0735348b@b7g2000pre.googlegroups.com>

On May 1, 11:13 am, smichr <smi... at gmail.com> wrote:
> Also, this approach is limited in that only variables can be arguments
> to functions, not node expressions. If x and d are variables, x/d
> becomes an expression and you cannot compute sin(x/d). Or am I missing
> something?
>

Note to self...it's best to restart with a fresh session if you've
been making modifications. everything appears to work fine without any
of the above observed problems:

>>> a=Number_with_uncert(3,1);y=a+cos(a);y.error
0.85888494187891229
>>> b=Number_with_uncert(4,1)
>>> cos(a/b)
<class '__main__.Semi_formal_expr_node'> object with result
0.731688868874 +- 0.213012112511

Sorry for the false alarm,
/c


From http  Fri May  1 03:22:22 2009
From: http (Paul Rubin)
Date: 01 May 2009 00:22:22 -0700
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz>
	<49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
Message-ID: <7xvdol1e4x.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
> for x in a or b or c:
>     do_something_with(x)

Ugh!!!!

  for x in [a,b,c]:
     if len(x) > 0:
       do_something_with(x)
       break


From yaksavage at gmail.com  Fri May  1 03:26:46 2009
From: yaksavage at gmail.com (thor)
Date: Fri, 1 May 2009 00:26:46 -0700 (PDT)
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<m2ab5x5obg.fsf@googlemail.com>
Message-ID: <d39da349-2b89-4cb1-b77e-6e208cd88ad0@q33g2000pra.googlegroups.com>

On May 1, 2:28?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
> Ross <ross.j... at gmail.com> writes:
> > If I have a list of tuples a = [(1,2), (3,4), (5,6)], and I want to
> > return a new list of each individual element in these tuples, I can do
> > it with a nested for loop but when I try to do it using the list
> > comprehension b = [j for j in i for i in a], my output is b =
> > [5,5,5,6,6,6] instead of the correct b = [1,2,3,4,5,6]. What am I
> > doing wrong?
>
> When writing nested list comprehension, the for loops are in the same
> order as you would write a normal nested for loop (which is not
> necessarily intuitive when you first find out but is very handy in the
> long run I think).
>
> So write:
>
> ? ? [j for i in a for j in i]
>
> --
> Arnaud
an trick
>>> a
[(1, 2), (3, 4), (5, 6)]
>>> sum(a, ())
(1, 2, 3, 4, 5, 6)
>>>
you may search the maillist , somebody questioned before


From http  Fri May  1 03:27:01 2009
From: http (Paul Rubin)
Date: 01 May 2009 00:27:01 -0700
Subject: urllib2 and threading
References: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
Message-ID: <7xr5z91dx6.fsf@ruckus.brouhaha.com>

robean <st1999 at gmail.com> writes:
> reach the urls with urllib2. The actual program will involve fairly
> elaborate scraping and parsing (I'm using Beautiful Soup for that) but
> the example shown here is simplified and just confirms the url of the
> site visited.

Keep in mind Beautiful Soup is pretty slow, so if you're doing a lot
of pages and have multiple cpu's, you probably want parallel processes
rather than threads.

> wrong? I am new to both threading and urllib2, so its possible that
> the SNAFU is quite obvious..
> ...
> ulock = threading.Lock()

Without looking at the code for more than a few seconds, using an
explicit lock like that is generally not a good sign.  The usual
Python style is to send all inter-thread communications through
Queues.  You'd dump all your url's into a queue and have a bunch of
worker threads getting items off the queue and processing them.  This
really avoids a lot of lock-related headache.  The price is that you
sometimes use more threads than strictly necessary.  Unless it's a LOT
of extra threads, it's usually not worth the hassle of messing with
locks.



From piet at cs.uu.nl  Fri May  1 03:45:29 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 01 May 2009 09:45:29 +0200
Subject: subprocess & shared environments
References: <8c79f749-e648-4a2e-afad-4053a8ec5cbd@f41g2000pra.googlegroups.com>
Message-ID: <m24ow5qnae.fsf@cs.uu.nl>

>>>>> Robert Dailey <rcdailey at gmail.com> (RD) wrote:

>RD> I'm currently calling subprocess.call() on a batch file (in Windows)
>RD> that sets a few environment variables that are needed by further
>RD> processes started via subprocess.call(). How can I persist the
>RD> environment modifications by the first call() function? I've done my
>RD> own searching on this and I came up with nothing.

Environments are propagated down the subprocess chain, not up. (I don't
know Windows good enough but I think this is also true on Windows.) What
you could do is have the batch file print the environment, read it in
your script and passing that environment to the other subprocesses. But
then why would you do it in a batch file? You could as well copy the
setting of the environment variables in your Python script. Or if the
batch file is supplied by another source, parse it and extract the
environment variables from it.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From li.wang.d at gmail.com  Fri May  1 04:03:22 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 1 May 2009 18:03:22 +1000
Subject: How to measure the memory cost in Python?
Message-ID: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com>

Hi everyone:

I want to measure the actual memory cost of a particular step in my program
(Python program), does anyone know if there is some function in Python could
help me to do this job? Or should I seek other tools to help me?

Thank you very much!

-- 
Li
------
Time is all we have
and you may find one day
you have less than you think
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From mu at problemlos.ch  Fri May  1 04:33:05 2009
From: mu at problemlos.ch (Kurt Mueller)
Date: Fri, 01 May 2009 10:33:05 +0200
Subject: string processing question
In-Reply-To: <3fbff25a-530e-4364-a7e1-3db6255b0d6b@k19g2000prh.googlegroups.com>
References: <mailman.4855.1241110874.11746.python-list@python.org>
	<3fbff25a-530e-4364-a7e1-3db6255b0d6b@k19g2000prh.googlegroups.com>
Message-ID: <49FAB3C1.70309@problemlos.ch>

Paul McGuire schrieb:
> --
> Weird. What happens if you change the second print statement to:
> print b.center(6,u"-")
Same behavior.


I have an even more minimal example:


:> python -c 'print unicode("?", "utf8")'
?

:> python -c 'print unicode("?", "utf8")' | cat
Traceback (most recent call last):
  File "<string>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode characters in position
0-1: ordinal not in range(128)


Just the difference of having piped the output to another program or to
a file.
Maybe we leave the other issue with the different centering for the moment.

My goal is to have my python programs unicode enabled.





TIA
-- 
Kurt Mueller

-- 
Kurt M?ller, mu at problemlos.ch 




From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 04:33:08 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 08:33:08 GMT
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz> <49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<7xvdol1e4x.fsf@ruckus.brouhaha.com>
Message-ID: <020aa73a$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 00:22:22 -0700, Paul Rubin wrote:

> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>> for x in a or b or c:
>>     do_something_with(x)
> 
> Ugh!!!!
> 
>   for x in [a,b,c]:
>      if len(x) > 0:
>        do_something_with(x)
>        break

What ugly, wasteful code. And it's *wrong* -- it doesn't do what my code 
does.

(1) Why build a list [a, b, c] that you don't need?

(2) Why assume that a, b and c are sequences with a fast __len__ method? 
They might be (say) linked lists that take O(N) to calculate the length, 
or binary trees that don't even have a length, but can be iterated over.

(3) And your code is wrong. I pass each element of the first non-empty 
sequence to do_something_with(). You pass the entire sequence. To do what 
my code does, you would need a nested for-loop like this:

for seq in [a,b,c]:
    if len(seq) > 0:
        for x in seq:
            do_something_with(x)
        break



-- 
Steven


From clp2 at rebertia.com  Fri May  1 04:42:02 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 1 May 2009 01:42:02 -0700
Subject: How to measure the memory cost in Python?
In-Reply-To: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com>
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com>
Message-ID: <50697b2c0905010142u628cb6f5t624b68e2860c8544@mail.gmail.com>

On Fri, May 1, 2009 at 1:03 AM, Li Wang <li.wang.d at gmail.com> wrote:
> Hi everyone:
>
> I want to measure the actual memory cost of a particular step in my program
> (Python program), does anyone know if there is some function in Python could
> help me to do this job? Or should I seek other tools to help me?

See Gabriel's answer in your other thread "Measure the memory cost in Python".
And please don't post duplicate threads asking essentially the same
question, especially when you were given a perfectly acceptable answer
and not that much time has past since you started the other thread.

Cheers,
Chris
-- 
http://blog.rebertia.com


From mail at microcorp.co.za  Fri May  1 04:49:22 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 1 May 2009 10:49:22 +0200
Subject: Multiprocessing.Queue - I want to end.
References: <200904301649.10341.kyrie@uh.cu>
Message-ID: <001201c9ca39$b9c4d140$0d00a8c0@Hendrik>

 "Luis Zarrabeitia" <akakyrie at uh.cu> wrote:

8< -------explanation and example of one producer, --------
8< -------more consumers and one queue --------------------

>As you can see, I'm sending one 'None' per consumer, and hoping that no 
>consumer will read more than one None. While this particular implementation 

You don't have to hope. You can write the consumers that way to guarantee it.

>ensures that, it is very fragile. Is there any way to signal the consumers? 

Signalling is not easy - you can signal a process, but I doubt if it is 
possible to signal a thread in a process.

>(or better yet, the queue itself, as it is shared by all consumers?) 
>Should "close" work for this? (raise the exception when the queue is 
>exhausted, not when it is closed by the producer).

I haven't the foggiest if this will work, and it seems to me to be kind
of involved compared to passing a sentinel or sentinels.

And while we are on the subject - Passing None as a sentinel is IMO as
good as or better than passing "XXZulu This is the End uluZXX",
or any other imaginative string that is not likely to occur naturally
in the input.

I have always wondered why people do the one queue many getters thing.

Given that the stuff you pass is homogenous in that it will require a
similar amount of effort to process, is there not a case to be made
to have as many queues as consumers, and to round robin the work?

And if the stuff you pass around needs disparate effort to consume,
it seems to me that you can more easily balance the load by having
specialised consumers, instead of instances of one humungous 
"I can eat anything" consumer.

I also think that having a queue per consumer thread makes it easier
to replace the threads with processes and the queues with pipes or
sockets if you need to do serious scaling later.

In fact I happen to believe that anything that does any work needs 
one and only one input queue and nothing else, but I am peculiar
that way.

- Hendrik




From phonethics at gmail.com  Fri May  1 04:53:33 2009
From: phonethics at gmail.com (Saurabh)
Date: Fri, 1 May 2009 14:23:33 +0530
Subject: returning values of a particular key from a dictionary
Message-ID: <a9ba20280905010153s1a58d6a7wedf0502146e0311b@mail.gmail.com>

arr = ({'x':'1', 'y':'a'}, {'x':'2', 'y':'b'}, {'x':'3', 'y':'c'})
print foo(arr, 'y')
['a','b','c']

I can write the function foo to return ['a','b','c'].
Is there some 'automatic'/built-in way to get this in Python ?

-- 
Phonethics


From http  Fri May  1 04:56:50 2009
From: http (Paul Rubin)
Date: 01 May 2009 01:56:50 -0700
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz>
	<49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<7xvdol1e4x.fsf@ruckus.brouhaha.com>
	<020aa73a$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <7xvdoldwvh.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> (2) Why assume that a, b and c are sequences with a fast __len__ method? 
> They might be (say) linked lists that take O(N) to calculate the length, 
> or binary trees that don't even have a length, but can be iterated over.

Why assume they have a bool method?  Or a __or__ operator?

> for seq in [a,b,c]:
>     if len(seq) > 0:
>         for x in seq:
>             do_something_with(x)
>         break

Eh.

   for seq in [a,b,c]:
     if sum(1 for x in imap(do_something_with, seq)) > 0:
       break


From http  Fri May  1 05:00:42 2009
From: http (Paul Rubin)
Date: 01 May 2009 02:00:42 -0700
Subject: returning values of a particular key from a dictionary
References: <mailman.4900.1241168016.11746.python-list@python.org>
Message-ID: <7xr5z9dwp1.fsf@ruckus.brouhaha.com>

Saurabh <phonethics at gmail.com> writes:
> arr = ({'x':'1', 'y':'a'}, {'x':'2', 'y':'b'}, {'x':'3', 'y':'c'})
> print foo(arr, 'y')
> ['a','b','c']

print list(a['y'] for a in arr)


From research at johnohagan.com  Fri May  1 05:03:50 2009
From: research at johnohagan.com (John O'Hagan)
Date: Fri, 1 May 2009 09:03:50 +0000
Subject: returning values of a particular key from a dictionary
In-Reply-To: <a9ba20280905010153s1a58d6a7wedf0502146e0311b@mail.gmail.com>
References: <a9ba20280905010153s1a58d6a7wedf0502146e0311b@mail.gmail.com>
Message-ID: <200905010903.51595.research@johnohagan.com>

On Fri, 1 May 2009, Saurabh wrote:
> arr = ({'x':'1', 'y':'a'}, {'x':'2', 'y':'b'}, {'x':'3', 'y':'c'})
> print foo(arr, 'y')
> ['a','b','c']
>
> I can write the function foo to return ['a','b','c'].
> Is there some 'automatic'/built-in way to get this in Python ?

List comprehension:

[i['y'] for i in arr]


Regards,

John


From mail at microcorp.co.za  Fri May  1 05:05:08 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 1 May 2009 11:05:08 +0200
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com><gt6kmp$i2g$3@lust.ihug.co.nz><49f85861$0$29010$426a74cc@news.free.fr><4t_Jl.37718$VA5.20343@tornado.fastwebnet.it><pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<7xvdol1e4x.fsf@ruckus.brouhaha.com>
Message-ID: <001f01c9ca3b$ed7c5740$0d00a8c0@Hendrik>

"Paul Rubin" <http://phr.cx at NOSPAM.invalid> wrote:


> Steven D'Aprano <stev at source.com.au> writes:
> > for x in a or b or c:
> >     do_something_with(x)
> 
> Ugh!!!!
> 
>   for x in [a,b,c]:
>      if len(x) > 0:
>        do_something_with(x)
>        break
> 
Ugh!!!!

for x in [a,b,c]:
    if x:
    do_something_with(x)
    break

:-)

- Hendrik



From clp2 at rebertia.com  Fri May  1 05:05:58 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 1 May 2009 02:05:58 -0700
Subject: returning values of a particular key from a dictionary
In-Reply-To: <a9ba20280905010153s1a58d6a7wedf0502146e0311b@mail.gmail.com>
References: <a9ba20280905010153s1a58d6a7wedf0502146e0311b@mail.gmail.com>
Message-ID: <50697b2c0905010205o63b1ab6coc84cf6a08e5e7372@mail.gmail.com>

On Fri, May 1, 2009 at 1:53 AM, Saurabh <phonethics at gmail.com> wrote:
> arr = ({'x':'1', 'y':'a'}, {'x':'2', 'y':'b'}, {'x':'3', 'y':'c'})
> print foo(arr, 'y')
> ['a','b','c']
>
> I can write the function foo to return ['a','b','c'].
> Is there some 'automatic'/built-in way to get this in Python ?

from operator import itemgetter
print map(itemgetter("y"), arr)

Cheers,
Chris
-- 
http://blog.rebertia.com


From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 05:11:22 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 09:11:22 GMT
Subject: bug with os.rename in 2.4.1?
References: <178473a3-906d-48e4-b84c-f9214d4fe708@w35g2000prg.googlegroups.com>
	<Xns9BFBBB5833A52duncanbooth@127.0.0.1>
	<f77e3266-09cb-4408-abee-523b787a5579@d38g2000prn.googlegroups.com>
	<slrngvejiq.t1f.nick@irishsea.home.craig-wood.com>
	<pan.2009.04.29.03.00.33@REMOVE.THIS.cybersource.com.au>
	<slrngvil9h.6rg.nick@irishsea.home.craig-wood.com>
Message-ID: <020ab030$0$20667$c3e8da3@news.astraweb.com>

On Thu, 30 Apr 2009 03:30:04 -0500, Nick Craig-Wood wrote:

>>  The race condition is still there. The only difference is that in the
>>  first case it fails noisily, with an exception, and in the second it
>>  fails quietly and does nothing.
> 
> I'd argue that since os.rename implements the syscall rename() and that
> is defined to be atomic (give or take) then the above is atomic and
> can't possibly be racy.

Ah, you're right, at least for systems where rename is atomic.

What I was trying to say is that the risk of the file *not* being renamed 
is still there, but in the first case the code failed noisily with an 
exception and in the second it just failed quietly. But that's wrong, the 
test is to see if the source file exists, not whether the destination 
file exists. If the destination file exists, and you have write-access to 
it, then it will be over-written no matter what.


-- 
Steven


From mu at problemlos.ch  Fri May  1 05:28:12 2009
From: mu at problemlos.ch (Kurt Mueller)
Date: Fri, 01 May 2009 11:28:12 +0200
Subject: string processing question
In-Reply-To: <bvKdncreYd1PdmTUnZ2dnUVZ_rSdnZ2d@pdx.net>
References: <mailman.4855.1241110874.11746.python-list@python.org>
	<bvKdncreYd1PdmTUnZ2dnUVZ_rSdnZ2d@pdx.net>
Message-ID: <49FAC0AC.2070905@problemlos.ch>

Scott David Daniels schrieb:
> To discover what is happening, try something like:
>     python -c 'for a in "?", unicode("?"): print len(a), a'
>
> I suspect that in your encoding, "?" is two bytes long, and in
> unicode it is converted to to a single character.

:> python -c 'for a in "?", unicode("?", "utf8"): print len(a), a'
2 ?
1 ?
:>

Yes it is. That is one of the two problems I see.
The solution for this is to unicode(<string>, <coding>) each string.


I'd like to have my python programs unicode enabled.




:> python -c 'for a in "?", unicode("?"): print len(a), a'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 0:
ordinal not in range(128)

It seems that the default encoding is "ascii", so unicode() cannot cope
with "?".
If I specify "utf8" for the encoding, unicode() works.

:> python -c 'for a in "?", unicode("?", "utf8"): print len(a), a'
2 ?
1 ?
:>                 


But the print statement yelds an UnicodeEncodeError
if I pipe the output to a program or a file.

:> python -c 'for a in "?", unicode("?", "utf8"): print len(a), a' | cat
Traceback (most recent call last):
  File "<string>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in
position 0: ordinal not in range(128)
2 ?
1 :>


So it seems to me, that piping the output changes the behavior of the
print statement:

:> python -c 'for a in "?", unicode("?", "utf8", "ignore"): print a,
len(a), type(a)'
? 2 <type 'str'>
? 1 <type 'unicode'>

:> python -c 'for a in "?", unicode("?", "utf8", "ignore"): print a,
len(a), type(a)'  | cat
Traceback (most recent call last):
  File "<string>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in
position 0: ordinal not in range(128)
? 2 <type 'str'>
:>




How can I achieve that my python programs are unicode enabled:
- Input strings can have different encodings (mostly ascii, latin_1 or utf8)
- My python programs should always output "utf8".

Is that a good idea??



TIA
-- 
Kurt M?ller, mu at problemlos.ch



From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 05:30:21 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 09:30:21 GMT
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz> <49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<gtdtsr$qv1$3@lust.ihug.co.nz>
Message-ID: <020ab4a3$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 16:30:19 +1200, Lawrence D'Oliveiro wrote:

> I have never written anything so unbelievable in my life. And I hope I
> never will.

I didn't say you did. If anyone thought I was quoting Lawrence's code, 
I'd be surprised. It was not my intention to put words into your mouth.

But seeing as you have replied, perhaps you could tell us something. 
Given so much you despise using non-bools in truth contexts, how would 
you re-write my example to avoid "a or b or c"?

for x in a or b or c:
    do_something_with(x)



-- 
Steven


From ldo at geek-central.gen.new_zealand  Fri May  1 05:40:41 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 01 May 2009 21:40:41 +1200
Subject: Light (general) Inter-Process Mutex/Wait/Notify Synchronization?
References: <mailman.4645.1240869985.11746.python-list@python.org>
	<7x3abthbc2.fsf@ruckus.brouhaha.com>
	<ab4fa3490904271745j5a9ba5dcpb66d6f94083a8b2a@mail.gmail.com>
	<4EEA4A39-1437-4AF1-93FF-F53B0EEB93AA@semanchuk.com>
	<mailman.4655.1240896009.11746.python-list@python.org>
	<49f729f5$0$1645$742ec2ed@news.sonic.net>
Message-ID: <gteg2p$666$1@lust.ihug.co.nz>

In message <49f729f5$0$1645$742ec2ed at news.sonic.net>, John Nagle wrote:

>      Linux doesn't do interprocess communication very well.
> ... and shared memory (unsafe).

What about with a futex?



From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 05:44:23 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 09:44:23 GMT
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz> <49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<7xvdol1e4x.fsf@ruckus.brouhaha.com>
	<020aa73a$0$20667$c3e8da3@news.astraweb.com>
	<7xvdoldwvh.fsf@ruckus.brouhaha.com>
Message-ID: <020ab7ed$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 01:56:50 -0700, Paul Rubin wrote:

> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
>> (2) Why assume that a, b and c are sequences with a fast __len__
>> method? They might be (say) linked lists that take O(N) to calculate
>> the length, or binary trees that don't even have a length, but can be
>> iterated over.
> 
> Why assume they have a bool method?  Or a __or__ operator?

What programming language are you using?

I'm using Python, where objects don't require either a bool or __or__ 
method (not operator) to work with the or operator.

>>> hasattr(None, '__or__') or hasattr(None, '__bool__') or \
... hasattr(None, '__nonzero__')
False
>>> 
>>> x = object()
>>> hasattr(x, '__or__') or hasattr(x, '__bool__') or \
... hasattr(x, '__nonzero__')
False
>>>
>>> None or x
<object object at 0xb7f3b4f0>

Any object can be used as an operand to the boolean operators.


> Eh.
> 
>    for seq in [a,b,c]:
>      if sum(1 for x in imap(do_something_with, seq)) > 0:
>        break

Did I stumble into an Obfuscated Python competition?




-- 
Steven


From gdamjan at gmail.com  Fri May  1 06:01:33 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Fri, 01 May 2009 12:01:33 +0200
Subject: Replacing files in a zip archive
References: <etloc6-t42.ln1@archaeopteryx.softver.org.mk>
	<eappc6-8m3.ln1@archaeopteryx.softver.org.mk>
	<6MmdnU-ISqVC3WfUnZ2dnUVZ_qCdnZ2d@pdx.net>
Message-ID: <ustqc6-h84.ln1@archaeopteryx.softver.org.mk>

> Which will produce the same output as the original, confounding
> your user.  You could just write the new values out, since .read
> picks the last entry (as I believe it should).  Alternatively, if
> you want to replace it "in place", you'll need a bit more smarts
> when there is more than one copy of a file in the archive (when
> z.namelist.count(filename) > 1).

I think I'll just hope that there will never be an ODF file like that, 
and if there is, then it's not my problem :)


-- 
?????? ( http://softver.org.mk/damjan/ )

Give me the knowledge to change the code I do not accept, 
the wisdom not to accept the code I cannot change, 
and the freedom to choose my preference.



From sion at viridian.paintbox  Fri May  1 06:46:34 2009
From: sion at viridian.paintbox (Sion Arrowsmith)
Date: Fri, 01 May 2009 10:46:34 GMT
Subject: string processing question
References: <mailman.4855.1241110874.11746.python-list@python.org>
	<3fbff25a-530e-4364-a7e1-3db6255b0d6b@k19g2000prh.googlegroups.com>
	<mailman.4897.1241166798.11746.python-list@python.org>
Message-ID: <eqAKl.2289$_e5.2089@newsfe21.ams2>

Kurt Mueller  <mu at problemlos.ch> wrote:
>:> python -c 'print unicode("?", "utf8")'
>?
>
>:> python -c 'print unicode("?", "utf8")' | cat
>Traceback (most recent call last):
>  File "<string>", line 1, in <module>
>UnicodeEncodeError: 'ascii' codec can't encode characters in position
>0-1: ordinal not in range(128)

$ python -c 'import sys; print sys.stdout.encoding'
UTF-8
$ python -c 'import sys; print sys.stdout.encoding' | cat
None

If print gets a Unicode string, it does an implicit
.encode(sys.stdout.encoding or sys.getdefaultencoding()) on it.
If you want your output to be guaranteed UTF-8, you'll need to
explicitly .encode("utf8") it yourself.

(I dare say this is slightly different in 3.x .)

-- 
\S

   under construction



From murali.au at gmail.com  Fri May  1 06:56:37 2009
From: murali.au at gmail.com (Murali kumar)
Date: Fri, 1 May 2009 16:26:37 +0530
Subject: problem in with keyword
Message-ID: <e4419f3f0905010356j1f5868cbn92ee309b5a22a108@mail.gmail.com>

hi all..

my application runs fine in windows xp using python 2.6 and wxpython 2.8.9

but in ubuntu 8.10 following error appears..  using python 2.5.2 and
wxpython 2.8.9

/home/murali/Desktop/mathdemo-configfinal/manageprofile.py:63: Warning:
'with' will become a reserved keyword in Python 2.6
Traceback (most recent call last):
  File "test.py", line 8, in <module>
    import manageprofile as managepf
  File "/home/murali/Desktop/mathdemo-configfinal/manageprofile.py", line 63
    with open(self.profile, 'wb') as configfile:
            ^
SyntaxError: invalid syntax

help for this problem..

Advanced thanks..
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From clp2 at rebertia.com  Fri May  1 07:12:37 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 1 May 2009 04:12:37 -0700
Subject: problem in with keyword
In-Reply-To: <e4419f3f0905010356j1f5868cbn92ee309b5a22a108@mail.gmail.com>
References: <e4419f3f0905010356j1f5868cbn92ee309b5a22a108@mail.gmail.com>
Message-ID: <50697b2c0905010412m172fe171v1162b8d26e02401b@mail.gmail.com>

On Fri, May 1, 2009 at 3:56 AM, Murali kumar <murali.au at gmail.com> wrote:
> hi all..
>
> my application runs fine in windows xp using python 2.6 and wxpython 2.8.9
>
> but in ubuntu 8.10 following error appears..? using python 2.5.2 and
> wxpython 2.8.9
>
> /home/murali/Desktop/mathdemo-configfinal/manageprofile.py:63: Warning:
> 'with' will become a reserved keyword in Python 2.6
> Traceback (most recent call last):
> ? File "test.py", line 8, in <module>
> ??? import manageprofile as managepf
> ? File "/home/murali/Desktop/mathdemo-configfinal/manageprofile.py", line 63
> ??? with open(self.profile, 'wb') as configfile:
> ??????????? ^
> SyntaxError: invalid syntax

According to PEP 343 (http://www.python.org/dev/peps/pep-0343/), the
`with` keyword was only added in Python 2.6

To use it in Python 2.5, you'd need to add:

from __future__ import with_statement

to any files using the `with` syntax. Or you could just upgrade to Python 2.6

Cheers,
Chris
-- 
http://blog.rebertia.com


From gabriel.rossetti at arimaz.com  Fri May  1 07:18:06 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Fri, 01 May 2009 13:18:06 +0200
Subject: Dynamically declared shared constant/variable imported twice problem
Message-ID: <49FADA6E.2080607@arimaz.com>

Hello everyone,

I have three modules A, B, C;

A declares this globally :

  UpdateEvent, UPDATE_EVENT_ID = wx.lib.newevent.NewEvent()

Then they import stuff from each other:

- A imports a constant from module B (in "__main__")
- A imports a class and some constants from module C
- B imports a constant from module A
- C imports UPDATE_EVENT_ID from module A

What happens is that since A imports stuff from B which then in turn
loads something from A, UPDATE_EVENT_ID gets redefined and when A sends
an event to C, C doesn't do anything since it doesn't have the same
UPDATE_EVENT_ID. Does anyone have an idea on how to fix this? If it had
been a statically defined variable then that wouldn't be "bad", but
since it's dynamic it does pose problems. More globally, how cn I
prevent this even with static constants? I don't think it's that great
to redefine the stuff multiple times and I've already had this problem
in the past with a constant dict.

Thank you,
Gabriel


From __peter__ at web.de  Fri May  1 07:37:39 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 01 May 2009 13:37:39 +0200
Subject: Dynamically declared shared constant/variable imported twice
	problem
References: <mailman.4911.1241176690.11746.python-list@python.org>
Message-ID: <gtemu0$213$02$1@news.t-online.com>

Gabriel Rossetti wrote:

> I have three modules A, B, C;
> 
> A declares this globally :
> 
>   UpdateEvent, UPDATE_EVENT_ID = wx.lib.newevent.NewEvent()
> 
> Then they import stuff from each other:
> 
> - A imports a constant from module B (in "__main__")
> - A imports a class and some constants from module C
> - B imports a constant from module A
> - C imports UPDATE_EVENT_ID from module A
> 
> What happens is that since A imports stuff from B which then in turn
> loads something from A, UPDATE_EVENT_ID gets redefined and when A sends
> an event to C, C doesn't do anything since it doesn't have the same
> UPDATE_EVENT_ID. Does anyone have an idea on how to fix this? If it had
> been a statically defined variable then that wouldn't be "bad", but
> since it's dynamic it does pose problems. More globally, how cn I
> prevent this even with static constants? I don't think it's that great
> to redefine the stuff multiple times and I've already had this problem
> in the past with a constant dict.

Imported modules are cached, so this problem shouldn't occur unless you use 
A.py as your main script. In this case it will be cached as "__main__", and 
if you import it elsewhere a second copy will be executed and cached as "A".

To fix it create a wrapper script that doesn't create any objects that will 
be used elsewhere, e. g.

#!/usr/bin/env python
import A
A.main()

assuming the function A.main() contains the code to start your application 
and invoke that instead of A.py

Peter



From venkatesh.th at gmail.com  Fri May  1 07:37:49 2009
From: venkatesh.th at gmail.com (venky)
Date: Fri, 1 May 2009 04:37:49 -0700 (PDT)
Subject: where to start with
Message-ID: <26ed4c2d-ac68-400c-9c5f-ceff0bfc6243@b7g2000pre.googlegroups.com>

Hi,

As iam very new to python i would like explore python. Can any body
guide me as your guidance is more worth than googling and finding it.

Thanks,
Venkat
http://www.prog2impress.com/


From clp2 at rebertia.com  Fri May  1 07:44:25 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 1 May 2009 04:44:25 -0700
Subject: where to start with
In-Reply-To: <26ed4c2d-ac68-400c-9c5f-ceff0bfc6243@b7g2000pre.googlegroups.com>
References: <26ed4c2d-ac68-400c-9c5f-ceff0bfc6243@b7g2000pre.googlegroups.com>
Message-ID: <50697b2c0905010444m775e4c16wf284e3209fd5352d@mail.gmail.com>

On Fri, May 1, 2009 at 4:37 AM, venky <venkatesh.th at gmail.com> wrote:
> Hi,
>
> As iam very new to python i would like explore python. Can any body
> guide me as your guidance is more worth than googling and finding it.

Good tutorials:
http://docs.python.org/tutorial/
http://diveintopython.org/toc/index.htm
http://openbookproject.net/thinkCSpy/index.xhtmll

To gain insight about Python's features and design:
http://www.python.org/dev/peps/pep-0000/

Cheers,
Chris
-- 
http://blog.rebertia.com


From opstad at batnet.com  Fri May  1 07:58:16 2009
From: opstad at batnet.com (opstad at batnet.com)
Date: Fri, 1 May 2009 04:58:16 -0700 (PDT)
Subject: Generator oddity
Message-ID: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>

I'm a little baffled by the inconsistency here. Anyone have any
explanations?

>>> def gen():
...   yield 'a'
...   yield 'b'
...   yield 'c'
...
>>> [c1 + c2 for c1 in gen() for c2 in gen()]
['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']

>>> list(c1 + c2 for c1 in gen() for c2 in gen())
['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']

>>> it1 = gen()
>>> it2 = gen()
>>> list(c1 + c2 for c1 in it1 for c2 in it2)
['aa', 'ab', 'ac']

Why does this last list only have three elements instead of nine?



From chambon.pascal at wanadoo.fr  Fri May  1 08:34:32 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Fri, 01 May 2009 14:34:32 +0200
Subject: Generator oddity
In-Reply-To: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
References: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
Message-ID: <49FAEC58.2000201@wanadoo.fr>

opstad at batnet.com a ?crit :
> I'm a little baffled by the inconsistency here. Anyone have any
> explanations?
>
>   
>>>> def gen():
>>>>         
> ...   yield 'a'
> ...   yield 'b'
> ...   yield 'c'
> ...
>   
>>>> [c1 + c2 for c1 in gen() for c2 in gen()]
>>>>         
> ['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']
>
>   
>>>> list(c1 + c2 for c1 in gen() for c2 in gen())
>>>>         
> ['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']
>
>   
>>>> it1 = gen()
>>>> it2 = gen()
>>>> list(c1 + c2 for c1 in it1 for c2 in it2)
>>>>         
> ['aa', 'ab', 'ac']
>
> Why does this last list only have three elements instead of nine?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
>   
When you use "for c2 in gen()]",  at each loop of c1, a new gen is 
instanciated and looped-over to continue building the list.
Whereas when you use "for c2 in it2)", it's always the same instance of 
gen which is used (it2), so after 3 loops on c2 this instance is 
exhausted, and the following iterations on c1 (and then attempts of 
looping on c2) don't give anything because the looping on c2 gives an 
exception "StopIteration".

Regards,
pascal


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From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 08:48:18 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 12:48:18 GMT
Subject: Generator oddity
References: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
Message-ID: <020ae308$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 04:58:16 -0700, opstad wrote:

> I'm a little baffled by the inconsistency here. Anyone have any
> explanations?
> 
>>>> def gen():
> ...   yield 'a'
> ...   yield 'b'
> ...   yield 'c'
> ...
>>>> [c1 + c2 for c1 in gen() for c2 in gen()]
> ['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']
> 
>>>> list(c1 + c2 for c1 in gen() for c2 in gen())
> ['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']
> 
>>>> it1 = gen()
>>>> it2 = gen()
>>>> list(c1 + c2 for c1 in it1 for c2 in it2)
> ['aa', 'ab', 'ac']
> 
> Why does this last list only have three elements instead of nine?


Ah, good one! That had me puzzled for a while too.

The answer is to write it out as a nested for-loop, using print in place 
of yield. Here's the first way:

for c1 in gen():
    for c2 in gen():
        print c1 + c2

And the second:

it1 = gen()
it2 = gen()
for c1 in it1:
    for c2 in it2:
        print c1 + c2


In the first example, the inner loop gets refreshed each time through the 
outer loop with a brand new instance of the generator. Expanding the 
loops in full:

# First method:
c1 = 'a'
call gen() to make an iterable
step through the fresh iterable, giving 'aa' 'ab' 'ac'
c1 = 'b'
call gen() to make an iterable
step through the fresh iterable, giving 'ba' 'bb' 'bc'
c1 = 'c'
call gen() to make an iterable
step through the fresh iterable, giving 'ca' 'cb' 'cc'


# Second method:
c1 = 'a'
inner iterable already exists
step through the iterable, giving 'aa' 'ab' 'ac'
c1 = 'b'
inner iterable is exhausted, so do nothing
c1 = 'c'
inner iterable is exhausted, so do nothing


And there you have it. A nice Gotcha for the books.



-- 
Steven


From duncan.booth at invalid.invalid  Fri May  1 08:53:01 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 1 May 2009 12:53:01 GMT
Subject: Generator oddity
References: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
Message-ID: <Xns9BFE8C95E989Bduncanbooth@127.0.0.1>

opstad at batnet.com wrote:

>>>> it1 = gen()
>>>> it2 = gen()
>>>> list(c1 + c2 for c1 in it1 for c2 in it2)
> ['aa', 'ab', 'ac']
> 
> Why does this last list only have three elements instead of nine?

First time through the c1 in it1 loop you use up all of the it2 values.
Second and third times through the c1 in it1 loop the it2 generator is 
still exhausted: you need to create a new generator each time if you want 
to repeat its values.


-- 
Duncan Booth http://kupuguy.blogspot.com


From opstad at batnet.com  Fri May  1 09:21:52 2009
From: opstad at batnet.com (opstad at batnet.com)
Date: Fri, 1 May 2009 06:21:52 -0700 (PDT)
Subject: Generator oddity
References: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
	<020ae308$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <c552d939-4e35-428d-83cf-1b176c21c43b@z8g2000prd.googlegroups.com>

D'oh! Many thanks for the explanation; I should have seen that myself.


From gabriel.rossetti at arimaz.com  Fri May  1 09:47:23 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Fri, 01 May 2009 15:47:23 +0200
Subject: Dynamically declared shared constant/variable imported twice
	problem
In-Reply-To: <gtemu0$213$02$1@news.t-online.com>
References: <mailman.4911.1241176690.11746.python-list@python.org>
	<gtemu0$213$02$1@news.t-online.com>
Message-ID: <49FAFD6B.6040906@arimaz.com>

Peter Otten wrote:
> Gabriel Rossetti wrote:
>
>   
>> I have three modules A, B, C;
>>
>> A declares this globally :
>>
>>   UpdateEvent, UPDATE_EVENT_ID = wx.lib.newevent.NewEvent()
>>
>> Then they import stuff from each other:
>>
>> - A imports a constant from module B (in "__main__")
>> - A imports a class and some constants from module C
>> - B imports a constant from module A
>> - C imports UPDATE_EVENT_ID from module A
>>
>> What happens is that since A imports stuff from B which then in turn
>> loads something from A, UPDATE_EVENT_ID gets redefined and when A sends
>> an event to C, C doesn't do anything since it doesn't have the same
>> UPDATE_EVENT_ID. Does anyone have an idea on how to fix this? If it had
>> been a statically defined variable then that wouldn't be "bad", but
>> since it's dynamic it does pose problems. More globally, how cn I
>> prevent this even with static constants? I don't think it's that great
>> to redefine the stuff multiple times and I've already had this problem
>> in the past with a constant dict.
>>     
>
> Imported modules are cached, so this problem shouldn't occur unless you use 
> A.py as your main script. In this case it will be cached as "__main__", and 
> if you import it elsewhere a second copy will be executed and cached as "A".
>
> To fix it create a wrapper script that doesn't create any objects that will 
> be used elsewhere, e. g.
>
> #!/usr/bin/env python
> import A
> A.main()
>
> assuming the function A.main() contains the code to start your application 
> and invoke that instead of A.py
>
> Peter
>
>   
Thank you Peter, I understand better now. I am indeed using A.py as my 
main script. I will create a launcher then, thank you.

Gabriel




From mu at problemlos.ch  Fri May  1 10:02:37 2009
From: mu at problemlos.ch (Kurt Mueller)
Date: Fri, 01 May 2009 16:02:37 +0200
Subject: string processing question
In-Reply-To: <eqAKl.2289$_e5.2089@newsfe21.ams2>
References: <mailman.4855.1241110874.11746.python-list@python.org>	<3fbff25a-530e-4364-a7e1-3db6255b0d6b@k19g2000prh.googlegroups.com>	<mailman.4897.1241166798.11746.python-list@python.org>
	<eqAKl.2289$_e5.2089@newsfe21.ams2>
Message-ID: <49FB00FD.8080007@problemlos.ch>

Sion Arrowsmith wrote:
> Kurt Mueller <mu at problemlos.ch> wrote:
>> :> python -c 'print unicode("?", "utf8")'
>> ?
>> :> python -c 'print unicode("?", "utf8")' | cat
>> Traceback (most recent call last):
>> File "<string>", line 1, in <module>
>> UnicodeEncodeError: 'ascii' codec can't encode characters in position
>> 0-1: ordinal not in range(128)
> $ python -c 'import sys; print sys.stdout.encoding'
> UTF-8
> $ python -c 'import sys; print sys.stdout.encoding' | cat
> None
>
> If print gets a Unicode string, it does an implicit
> .encode(sys.stdout.encoding or sys.getdefaultencoding()) on it.
> If you want your output to be guaranteed UTF-8, you'll need to
> explicitly .encode("utf8") it yourself.

This works now correct with and without piping:

python -c 'a=unicode("?", "utf8") ; print (a.encode("utf8"))'



In my python source code I have these two lines first:
#!/usr/bin/env python
# vim: set fileencoding=utf-8 :

So the source code itself and the strings in the source code
are interpreted as utf-8.

But from the command line python interprets the code
as 'latin_1' I presume. That is why I have to convert
the "?" with unicode().
Am I right?


> (I dare say this is slightly different in 3.x .)
I heard about it but I wait to go to 3.x until its time to...




Thanks
-- 
Kurt Mueller

-- 
Kurt M?ller, mu at problemlos.ch 




From davea at ieee.org  Fri May  1 10:25:23 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 01 May 2009 10:25:23 -0400
Subject: Generator oddity
In-Reply-To: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
References: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
Message-ID: <49FB0653.6030603@ieee.org>

opstad at batnet.com wrote:
> I'm a little baffled by the inconsistency here. Anyone have any
> explanations?
>
>   
>>>> def gen():
>>>>         
> ...   yield 'a'
> ...   yield 'b'
> ...   yield 'c'
> ...
>   
>>>> [c1 + c2 for c1 in gen() for c2 in gen()]
>>>>         
> ['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']
>
>   
>>>> list(c1 + c2 for c1 in gen() for c2 in gen())
>>>>         
> ['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']
>
>   
>>>> it1 = gen()
>>>> it2 = gen()
>>>> list(c1 + c2 for c1 in it1 for c2 in it2)
>>>>         
> ['aa', 'ab', 'ac']
>
> Why does this last list only have three elements instead of nine?
>
>
>   
The problem is in it2, which is initialized only once.  Thus the second 
time you're going through the c2 loop, it doesn't have any more values.

If you need the indirection provided by those it1 and it2, you need to 
postpone the function evaluation, at least for it2.

I'd do
it1 = gen
it2 = gen

list(c1 + c2 for c1 in it1() for c2 in it2())
or more simply:
[c1 + c2 for c1 in it1() for c2 in it2()]






From andreengels at gmail.com  Fri May  1 10:31:44 2009
From: andreengels at gmail.com (Andre Engels)
Date: Fri, 1 May 2009 16:31:44 +0200
Subject: Generator oddity
In-Reply-To: <49FB0653.6030603@ieee.org>
References: <a227085e-7ab7-4ca8-8899-c22bd7eef87a@n7g2000prc.googlegroups.com>
	<49FB0653.6030603@ieee.org>
Message-ID: <6faf39c90905010731v4405d51fu34df9d8e4adeeb83@mail.gmail.com>

On Fri, May 1, 2009 at 4:25 PM, Dave Angel <davea at ieee.org> wrote:

> The problem is in it2, which is initialized only once. ?Thus the second time
> you're going through the c2 loop, it doesn't have any more values.
>
> If you need the indirection provided by those it1 and it2, you need to
> postpone the function evaluation, at least for it2.
>
> I'd do
> it1 = gen
> it2 = gen
>
> list(c1 + c2 for c1 in it1() for c2 in it2())
> or more simply:
> [c1 + c2 for c1 in it1() for c2 in it2()]

Another possibility would be to use the outcome of looping through the
generator rather than the generator itself:

it1 = list(gen())
it2 = list(gen())
[c1 + c2 for c1 in it1() for c2 in it2()]


-- 
Andr? Engels, andreengels at gmail.com


From james at agentultra.com  Fri May  1 10:31:45 2009
From: james at agentultra.com (J Kenneth King)
Date: Fri, 01 May 2009 10:31:45 -0400
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
Message-ID: <85ocucnbce.fsf@agentultra.com>

Chris Rebert <clp2 at rebertia.com> writes:

> On Thu, Apr 30, 2009 at 5:56 PM, Ross <ross.jett at gmail.com> wrote:
>> If I have a list of tuples a = [(1,2), (3,4), (5,6)], and I want to
>> return a new list of each individual element in these tuples, I can do
>> it with a nested for loop but when I try to do it using the list
>> comprehension b = [j for j in i for i in a], my output is b =
>> [5,5,5,6,6,6] instead of the correct b = [1,2,3,4,5,6]. What am I
>> doing wrong?
>
> Your comprehension is the identity comprehension (i.e. it effectively
> just copies the list as-is).
> What you're trying to do is difficult if not impossible to do as a
> comprehension.
>
> Here's another approach:
> b = list(itertools.chain.from_iterable(a))
>
> And without using a library function:
> b = []
> for pair in a:
>     for item in pair:
>         b.append(item)

This is much more clear than a nested comprehension.

I love comprehensions, but abusing them can lead to really dense and
difficult to read code.


From zealalot at gmail.com  Fri May  1 10:35:40 2009
From: zealalot at gmail.com (zealalot)
Date: Fri, 1 May 2009 07:35:40 -0700 (PDT)
Subject: Passing a function as an argument from within the same class?
Message-ID: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>

So, I'm trying to come up with a way to pass a method (from the same
class) as the default argument for another method in the same class.
Unfortunately though, I keep getting "self not defined" errors since
the class hasn't been read completely before it references itself.

Is there a better way of doing this?

--- CODE ---

class SomeClass():
    def doNothing(self):
        pass
    def function1(self):
        print "Running function 1."
    def function2(self, passedFunction=self.doNothing):
        print "Running passed function."
        passedFunction()

someObject = SomeClass()
someObject.function2(someobject.function1)

--- CODE ---

Thanks,
- Zealalot


From debatem1 at gmail.com  Fri May  1 10:38:49 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 1 May 2009 07:38:49 -0700 (PDT)
Subject: where to start with
References: <26ed4c2d-ac68-400c-9c5f-ceff0bfc6243@b7g2000pre.googlegroups.com>
Message-ID: <f1dcd5f7-2565-46a1-9d87-ed58a79c6fa1@y10g2000prc.googlegroups.com>

I'd add http://diveintopython.org/ to that list as you gain more
experience with Python, or if you already know at least one language.



From linuxguy123 at gmail.com  Fri May  1 10:41:09 2009
From: linuxguy123 at gmail.com (Linuxguy123)
Date: Fri, 01 May 2009 08:41:09 -0600
Subject: Python servlet for Java applet ?
In-Reply-To: <m2ws92tkgk.fsf@cs.uu.nl>
References: <mailman.4513.1240594464.11746.python-list@python.org>
	<m21vrhd2lv.fsf@cs.uu.nl>
	<mailman.4753.1241010895.11746.python-list@python.org>
	<m2ws92tkgk.fsf@cs.uu.nl>
Message-ID: <1241188869.3773.28.camel@localhost.localdomain>


On Thu, 2009-04-30 at 14:06 +0200, Piet van Oostrum wrote:

> Well, for a start, in the Python world the word 'servlet' isn't used
> much. So I assume it comes from your Java legacy and you actually mean
> 'any server-side python script' (in webware they use the term
> 'servlet', however).

<snip>

I agree that servlet isn't a Python term.  I should have put it in
quotes. 

Your reply was very instructive.  Thanks for taking the time to post
it. 

I am probably going to build my "servlet" as a simple Python socket
service. 

LG





From bearophileHUGS at lycos.com  Fri May  1 10:44:43 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 1 May 2009 07:44:43 -0700 (PDT)
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
Message-ID: <4a39ccba-56c0-400b-bd0b-60bbe042ba0d@d7g2000prl.googlegroups.com>

Zealalot, probably there are some ways to do that, but a simple one is
the following (not tested):

def function2(self, passed_function=None):
    if passed_function is None:
        passed_function = self.doNothing
    ...

Bye,
bearophile


From ppearson at nowhere.invalid  Fri May  1 10:48:51 2009
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 1 May 2009 14:48:51 GMT
Subject: What do you think of ShowMeDo
References: <b6671f88-bc04-42eb-aad1-5b212bcab1ef@z23g2000prd.googlegroups.com>
	<87tz48s7hm.fsf@benfinney.id.au>
	<52d28fba-ebf7-4bfb-b568-64304da650d5@w31g2000prd.googlegroups.com>
	<pan.2009.04.29.06.27.10@REMOVE.THIS.cybersource.com.au>
	<17bacf12-037f-4dda-8ee3-1b51d83ac654@z23g2000prd.googlegroups.com>
	<gtd6l3$1ph4$1@news.ett.com.ua>
Message-ID: <760gejF1af7reU1@mid.individual.net>

On Fri, 1 May 2009 07:53:35 +1000, Paul Hemans <darwin at nowhere.com> wrote:
[snip]
> them as they have been recorded in the anals of the web, however I 
.........................................^^^^^

That's the second time in this thread.  The first might have been
deliberate gross wordplay, but now it's time for somebody to point
out that maybe this word doesn't mean what you think it means.

-- 
To email me, substitute nowhere->spamcop, invalid->net.


From debatem1 at gmail.com  Fri May  1 10:50:06 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 1 May 2009 07:50:06 -0700 (PDT)
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
Message-ID: <39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com>

Make doNothing a classmethod.

class SomeClass:

    @classmethod
    def doNothing(cls):
        pass

    def function1(self):
        print "Running function 1"

    def function2(self, passedFunction=SomeClass.doNothing):
        print "Running passed function"
        passedFunction()

someObject = SomeClass()
someObject.function2()
someObject.function2(someObject.function1)




From debatem1 at gmail.com  Fri May  1 10:54:39 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 1 May 2009 07:54:39 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<mailman.4898.1241167327.11746.python-list@python.org>
Message-ID: <7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>

Not OP, but I'd actually like to know if there's an answer to this one
that doesn't involve platform-specific tools.



From invalid at invalid  Fri May  1 10:54:41 2009
From: invalid at invalid (Grant Edwards)
Date: Fri, 01 May 2009 09:54:41 -0500
Subject: What do you think of ShowMeDo
References: <b6671f88-bc04-42eb-aad1-5b212bcab1ef@z23g2000prd.googlegroups.com>
	<87tz48s7hm.fsf@benfinney.id.au>
	<52d28fba-ebf7-4bfb-b568-64304da650d5@w31g2000prd.googlegroups.com>
	<pan.2009.04.29.06.27.10@REMOVE.THIS.cybersource.com.au>
	<17bacf12-037f-4dda-8ee3-1b51d83ac654@z23g2000prd.googlegroups.com>
	<gtd6l3$1ph4$1@news.ett.com.ua> <760gejF1af7reU1@mid.individual.net>
Message-ID: <69ydne2K6eiskGbUnZ2dnUVZ_radnZ2d@posted.visi>

On 2009-05-01, Peter Pearson <ppearson at nowhere.invalid> wrote:
> On Fri, 1 May 2009 07:53:35 +1000, Paul Hemans <darwin at nowhere.com> wrote:
> [snip]
>> them as they have been recorded in the anals of the web, however I 
>.........................................^^^^^
>
> That's the second time in this thread.  The first might have been
> deliberate gross wordplay, but now it's time for somebody to point
> out that maybe this word doesn't mean what you think it means.

You've got to admit it's rather funny. :)

-- 
Grant Edwards                   grante             Yow! I just heard the
                                  at               SEVENTIES were over!!  And
                               visi.com            I was just getting in touch
                                                   with my LEISURE SUIT!!


From clp2 at rebertia.com  Fri May  1 11:04:16 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 1 May 2009 08:04:16 -0700
Subject: How to measure the memory cost in Python?
In-Reply-To: <7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com>
	<mailman.4898.1241167327.11746.python-list@python.org>
	<7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
Message-ID: <50697b2c0905010804k7ad376eapd43c9f6bc24bf7df@mail.gmail.com>

On Fri, May 1, 2009 at 7:54 AM, CTO <debatem1 at gmail.com> wrote:
> Not OP, but I'd actually like to know if there's an answer to this one
> that doesn't involve platform-specific tools.

sys.getsizeof() [a suggested solution] isn't platform-specific.

Cheers,
Chris
-- 
http://blog.rebertia.com


From st1999 at gmail.com  Fri May  1 11:09:06 2009
From: st1999 at gmail.com (robean)
Date: Fri, 1 May 2009 08:09:06 -0700 (PDT)
Subject: urllib2 and threading
References: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
	<7xr5z91dx6.fsf@ruckus.brouhaha.com>
Message-ID: <a89b4950-9db9-45ee-a9cd-efb5ca2e0dc8@x31g2000prc.googlegroups.com>

Thanks for your reply. Obviously you make several good points about
Beautiful Soup and Queue. But here's the problem: even if I do nothing
whatsoever with the threads beyond just visiting the urls with
urllib2, the program chokes. If I replace

  else:
    ulock.acquire()
    print page.geturl() # obviously, do something more useful
here,eventually
    page.close()
    ulock.release()

with

  else:
    pass

the urllib2 starts raising URLErrros after the first 3 - 5 urls have
been visited. Do you have any sense what in the threads is corrupting
urllib2's behavior?  Many thanks,

Robean



On May 1, 12:27?am, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> robean <st1... at gmail.com> writes:
> > reach the urls with urllib2. The actual program will involve fairly
> > elaborate scraping and parsing (I'm using Beautiful Soup for that) but
> > the example shown here is simplified and just confirms the url of the
> > site visited.
>
> Keep in mind Beautiful Soup is pretty slow, so if you're doing a lot
> of pages and have multiple cpu's, you probably want parallel processes
> rather than threads.
>
> > wrong? I am new to both threading and urllib2, so its possible that
> > the SNAFU is quite obvious..
> > ...
> > ulock = threading.Lock()
>
> Without looking at the code for more than a few seconds, using an
> explicit lock like that is generally not a good sign. ?The usual
> Python style is to send all inter-thread communications through
> Queues. ?You'd dump all your url's into a queue and have a bunch of
> worker threads getting items off the queue and processing them. ?This
> really avoids a lot of lock-related headache. ?The price is that you
> sometimes use more threads than strictly necessary. ?Unless it's a LOT
> of extra threads, it's usually not worth the hassle of messing with
> locks.



From zealalot at gmail.com  Fri May  1 11:11:01 2009
From: zealalot at gmail.com (zealalot)
Date: Fri, 1 May 2009 08:11:01 -0700 (PDT)
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
	<39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com>
Message-ID: <abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com>

On May 1, 10:50?am, CTO <debat... at gmail.com> wrote:
> Make doNothing a classmethod.
>
> class SomeClass:
>
> ? ? @classmethod
> ? ? def doNothing(cls):
> ? ? ? ? pass
>
> ? ? def function1(self):
> ? ? ? ? print "Running function 1"
>
> ? ? def function2(self, passedFunction=SomeClass.doNothing):
> ? ? ? ? print "Running passed function"
> ? ? ? ? passedFunction()
>
> someObject = SomeClass()
> someObject.function2()
> someObject.function2(someObject.function1)

It's not surprising, but I've never heard of a classmethod before.
Basically, I read that it basically removes the need for the 'self'
argument.  Very cool!

And thanks for the quick response,

- Zealalot


From kyle at kyleterry.com  Fri May  1 11:20:34 2009
From: kyle at kyleterry.com (Kyle Terry)
Date: Fri, 1 May 2009 08:20:34 -0700
Subject: where to start with
In-Reply-To: <f1dcd5f7-2565-46a1-9d87-ed58a79c6fa1@y10g2000prc.googlegroups.com>
References: <26ed4c2d-ac68-400c-9c5f-ceff0bfc6243@b7g2000pre.googlegroups.com>
	<f1dcd5f7-2565-46a1-9d87-ed58a79c6fa1@y10g2000prc.googlegroups.com>
Message-ID: <65a7ac1b0905010820u2e4309ib894fbcc0caa7713@mail.gmail.com>

On Fri, May 1, 2009 at 7:38 AM, CTO <debatem1 at gmail.com> wrote:

> I'd add http://diveintopython.org/ to that list as you gain more
> experience with Python, or if you already know at least one language.


Wasn't diveintopython in his list?

>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From __peter__ at web.de  Fri May  1 11:41:27 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 01 May 2009 17:41:27 +0200
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
	<39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com>
Message-ID: <gtf573$1mi$01$1@news.t-online.com>

CTO wrote:

> Make doNothing a classmethod.
> 
> class SomeClass:
> 
>     @classmethod
>     def doNothing(cls):
>         pass
> 
>     def function1(self):
>         print "Running function 1"
> 
>     def function2(self, passedFunction=SomeClass.doNothing):
>         print "Running passed function"
>         passedFunction()
> 
> someObject = SomeClass()
> someObject.function2()
> someObject.function2(someObject.function1)

To make that run without error you have to jump through a lot of hoops:

class SomeClass(object):
    @classmethod
    def doNothing(cls):
        pass
    def function1(self):
        print "Running function 1"

def function2(self, passedFunction=SomeClass.doNothing):
    print "Running passed function"
    passedFunction()

SomeClass.function2 = function2

someObject = SomeClass()
someObject.function2()
someObject.function2(someObject.function1)

And if you don't need access to the instance you may not need access to the 
class either. In this case you can simplify:

def doNothing():
    pass

class SomeClass(object):
    def function1(self):
        print "Running function 1"
    def function2(self, passedFunction=doNothing):
        print "Running passed function"
        passedFunction()

If you do need information about the state of the instance you can either 
pass it explicitly

class SomeClass(object):
    def doNothing(self):
        pass
    def function1(self):
        print "Running function 1"
    def function2(self, passedFunction=doNothing):
        print "Running passed function"
        passedFunction.__get__(self)()

or (better, I think) use a sentinel as shown by Bearophile.

Peter



From emile at fenx.com  Fri May  1 12:01:05 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 01 May 2009 09:01:05 -0700
Subject: list comprehension question
In-Reply-To: <85ocucnbce.fsf@agentultra.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
Message-ID: <gtf6ak$8a2$1@ger.gmane.org>

On 5/1/2009 7:31 AM J Kenneth King said...
> Chris Rebert <clp2 at rebertia.com> writes:
>> b = []
>> for pair in a:
>>     for item in pair:
>>         b.append(item)
> 
> This is much more clear than a nested comprehension.
> 
> I love comprehensions, but abusing them can lead to really dense and
> difficult to read code.

I disagree on dense and difficult, although I'll leave open the question 
of abuse.

b = [ item for pair in a for item in pair ]

This is exactly the code above expressed in comprehension form.

It's worth knowing that a list comprehension is structured identically 
to the equivalent for loop.  So it really is neither more dense nor more 
difficult to read.  Further, you can tell immediately from the start of 
the list comprehension what you've got -- in this case a list of item(s).

Here with some slight changes...

 >>> a = [(1, 2), (3, 4, 7), (5, 6)]
 >>> [ item for j in a if len(j)==2 for item in j if item % 2 ]
[1, 5]

...opposed to...

 >>> for j in a:
...     if len(j)==2:
...         for item in j:
...             if item % 2:
...                 b.append(item)
...
 >>> b
[1, 5]
 >>>

YMMV,

Emile




From Scott.Daniels at Acm.Org  Fri May  1 12:06:28 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 01 May 2009 09:06:28 -0700
Subject: string processing question
In-Reply-To: <mailman.4904.1241170101.11746.python-list@python.org>
References: <mailman.4855.1241110874.11746.python-list@python.org>	<bvKdncreYd1PdmTUnZ2dnUVZ_rSdnZ2d@pdx.net>
	<mailman.4904.1241170101.11746.python-list@python.org>
Message-ID: <O4CdnYOLBaqVgGbUnZ2dnUVZ_rqdnZ2d@pdx.net>

Kurt Mueller wrote:
> Scott David Daniels schrieb:
>> To discover what is happening, try something like:
>>     python -c 'for a in "?", unicode("?"): print len(a), a'
>>
>> I suspect that in your encoding, "?" is two bytes long, and in
>> unicode it is converted to to a single character.
> 
> :> python -c 'for a in "?", unicode("?", "utf8"): print len(a), a'
> 2 ?
> 1 ?
> :>
> 
> Yes it is. That is one of the two problems I see.
> The solution for this is to unicode(<string>, <coding>) each string.
> 
> 
> I'd like to have my python programs unicode enabled.
> 
> 
> 
> 
> :> python -c 'for a in "?", unicode("?"): print len(a), a'
> Traceback (most recent call last):
>   File "<string>", line 1, in <module>
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 0:
> ordinal not in range(128)
> 
> It seems that the default encoding is "ascii", so unicode() cannot cope
> with "?".
> If I specify "utf8" for the encoding, unicode() works.
> 
> :> python -c 'for a in "?", unicode("?", "utf8"): print len(a), a'
> 2 ?
> 1 ?
> :>                 
> 
> 
> But the print statement yelds an UnicodeEncodeError
> if I pipe the output to a program or a file.
> 
> :> python -c 'for a in "?", unicode("?", "utf8"): print len(a), a' | cat
> Traceback (most recent call last):
>   File "<string>", line 1, in <module>
> UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in
> position 0: ordinal not in range(128)
> 2 ?
> 1 :>
> 
> 
> So it seems to me, that piping the output changes the behavior of the
> print statement:
> 
> :> python -c 'for a in "?", unicode("?", "utf8", "ignore"): print a,
> len(a), type(a)'
> ? 2 <type 'str'>
> ? 1 <type 'unicode'>
> 
> :> python -c 'for a in "?", unicode("?", "utf8", "ignore"): print a,
> len(a), type(a)'  | cat
> Traceback (most recent call last):
>   File "<string>", line 1, in <module>
> UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in
> position 0: ordinal not in range(128)
> ? 2 <type 'str'>
> :>
> 
> 
> 
> 
> How can I achieve that my python programs are unicode enabled:
> - Input strings can have different encodings (mostly ascii, latin_1 or utf8)
> - My python programs should always output "utf8".
> 
> Is that a good idea??

OK, the issue here is your use of -c, rather than an actual source file.
I don't know how to make -c take the magic initial encoding line.
If you rely on ascii source, you are safe, but have to write things like
      ms = u'That would be na\u00EFve'
  or  ms = u'That would be na\xEFve.'
  or  ms = u'That would be na\N{LATIN SMALL LETTER I WITH DIAERESIS}ve.'

If you do put an encoding line in your source (first or second line):
      # -*- coding: utf-8 -*-
  or  # -*- coding: iso-8859-1 -*-
  or  # -*- coding: latin-1 -*-

you can (later in that file) simply use:
      ms = u'That would be na?ve.'

That is, I would avoid non-ascii source for plain strings in 2.X unless
you have a _very_ good reason; use it, instead, for unicode strings.

--Scott David Daniels
Scott.Daniels at Acm.Org


From arnodel at googlemail.com  Fri May  1 12:19:21 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 01 May 2009 17:19:21 +0100
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
Message-ID: <m263gk6bjq.fsf@googlemail.com>

Emile van Sebille <emile at fenx.com> writes:

> On 5/1/2009 7:31 AM J Kenneth King said...
>> Chris Rebert <clp2 at rebertia.com> writes:
>>> b = []
>>> for pair in a:
>>>     for item in pair:
>>>         b.append(item)
>>
>> This is much more clear than a nested comprehension.
>>
>> I love comprehensions, but abusing them can lead to really dense and
>> difficult to read code.
>
> I disagree on dense and difficult, although I'll leave open the
> question of abuse.
>
> b = [ item for pair in a for item in pair ]
>
> This is exactly the code above expressed in comprehension form.

If the comprehension above is an abuse, then every nested list
comprehension is an abuse of comprehensions so they might as well not be
in the language...

-- 
Arnaud


From sgeiger at councilforeconed.org  Fri May  1 12:24:05 2009
From: sgeiger at councilforeconed.org (Shane Geiger)
Date: Fri, 01 May 2009 12:24:05 -0400
Subject: list comprehension question
In-Reply-To: <50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>
Message-ID: <49FB2225.4030601@councilforeconed.org>

from goopy.functional import flatten  # 
http://sourceforge.net/projects/goog-goopy/
b = [(1,2), (3,4), (5,6)]
print flatten(b)



#from goopy.functional import flatten  # 
http://sourceforge.net/projects/goog-goopy/

def flatten(seq):
  """
  Returns a list of the contents of seq with sublists and tuples "exploded".
  The resulting list does not contain any sequences, and all inner sequences
  are exploded.  For example:

  >>> flatten([7,(6,[5,4],3),2,1])
  [7,6,5,4,3,2,1]
  """
  lst = []
  for el in seq:
    if type(el) == list or type(el) is tuple:
      lst.extend(flatten(el))
    else:
      lst.append(el)
  return lst



Chris Rebert wrote:
> On Thu, Apr 30, 2009 at 5:56 PM, Ross <ross.jett at gmail.com> wrote:
>   
>> If I have a list of tuples a = [(1,2), (3,4), (5,6)], and I want to
>> return a new list of each individual element in these tuples, I can do
>> it with a nested for loop but when I try to do it using the list
>> comprehension b = [j for j in i for i in a], my output is b =
>> [5,5,5,6,6,6] instead of the correct b = [1,2,3,4,5,6]. What am I
>> doing wrong?
>>     
>
> Your comprehension is the identity comprehension (i.e. it effectively
> just copies the list as-is).
> What you're trying to do is difficult if not impossible to do as a
> comprehension.
>
> Here's another approach:
> b = list(itertools.chain.from_iterable(a))
>
> And without using a library function:
> b = []
> for pair in a:
>     for item in pair:
>         b.append(item)
>
> Cheers,
> Chris
>   


-- 
Shane Geiger, IT Director
Council For Economic Education / www.councilforeconed.org
sgeiger at councilforeconed.org  / 402-438-8958

Teaching Opportunity



From warpcat at sbcglobal.net  Fri May  1 12:24:10 2009
From: warpcat at sbcglobal.net (warpcat)
Date: Fri, 1 May 2009 09:24:10 -0700 (PDT)
Subject: object query assigned variable name?
Message-ID: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>

I've passed this around some other groups, and I'm being told
"probably not possible".  But I thought I'd try here as well :)   I
*did* search first, and found several similar threads, but they
quickly tangented into other specifics of the language that were a bit
over my head :)  At any rate, here's a simple example, I'd love to
know if as shown, is somehow possible:

Given an object:

class Spam(object):
    def __init__(self):
        # stuff....

I'd like it to print, when instanced, something like this:

>>> s = Spam()
I?m assigned to s!

But it seems prohibitively hard (based on my web and forum searches)
for an object to know what variable name is has been assigned to when
created.  Querying 'self' in __init__ returns a memory location, not
the variable name passed in.

If you're wondering why I'm trying to figure this out, this is just
part of my continued learning of the language and pushing the bounds,
to see what is possible ;)

Any thoughts?


From chris at simplistix.co.uk  Fri May  1 12:26:29 2009
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 01 May 2009 17:26:29 +0100
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <49E60832.8030806@egenix.com>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com>
Message-ID: <49FB22B5.3040507@simplistix.co.uk>

M.-A. Lemburg wrote:
> """
> If the package really requires adding one or more directories on sys.path (e.g.
> because it has not yet been structured to support dotted-name import), a "path
> configuration file" named package.pth can be placed in either the site-python or
> site-packages directory.
> ...
> A typical installation should have no or very few .pth files or something is
> wrong, and if you need to play with the search order, something is very wrong.
> """

I'll say! I think .pth files are absolute evil and I wish they could 
just be banned.

+1 on anything that makes them closer to going away or reduces the 
possibility of yet another similar feature from hurting the 
comprehensibility of a python setup.

Chris

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk


From stefan_ml at behnel.de  Fri May  1 12:29:22 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 01 May 2009 18:29:22 +0200
Subject: urllib2 and threading
In-Reply-To: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
References: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
Message-ID: <49fb2363$0$31865$9b4e6d93@newsspool3.arcor-online.net>

robean wrote:
> I am writing a program that involves visiting several hundred webpages
> and extracting specific information from the contents. I've written a
> modest 'test' example here that uses a multi-threaded approach to
> reach the urls with urllib2. The actual program will involve fairly
> elaborate scraping and parsing (I'm using Beautiful Soup for that)

Try lxml.html instead. It often parses HTML pages better than BS, can parse
directly from HTTP/FTP URLs, frees the GIL doing so, and is generally a lot
faster and more memory friendly than the combination of urllib2 and BS,
especially when threading is involved. It also supports CSS selectors for
finding page content, so your "elaborate scraping" might actually turn out
to be a lot simpler than you think.

http://codespeak.net/lxml/

These might be worth reading:

http://blog.ianbicking.org/2008/12/10/lxml-an-underappreciated-web-scraping-library/
http://blog.ianbicking.org/2008/03/30/python-html-parser-performance/

Stefan


From chris at simplistix.co.uk  Fri May  1 12:30:16 2009
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 01 May 2009 17:30:16 +0100
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <49E60832.8030806@egenix.com>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com>
Message-ID: <49FB2398.5000708@simplistix.co.uk>

M.-A. Lemburg wrote:
> The much more common use case is that of wanting to have a base package
> installation which optional add-ons that live in the same logical
> package namespace.
> 
> The PEP provides a way to solve this use case by giving both developers
> and users a standard at hand which they can follow without having to
> rely on some non-standard helpers and across Python implementations.
> 
> My proposal tries to solve this without adding yet another .pth
> file like mechanism - hopefully in the spirit of the original Python
> package idea.

Okay, I need to issue a plea for a little help.

I think I kinda get what this PEP is about now, and as someone who wants 
  to ship a base package with several add-ons that live in the same 
logical package namespace, I'm very interested.

However, despite trying to follow this thread *and* having tried to read 
the PEP a couple of times, I still don't know how I'd go about doing this.

I did give some examples from what I'd be looking to do much earlier.

I'll ask again in the vague hope of you or someone else explaining 
things to me like I'm a 5 year old - something I'm mentally equipped to 
be well ;-)

In either of the proposals on the table, what code would I write and 
where to have a base package with a set of add-on packages?

Simple examples would be greatly appreciated, and might bring things 
into focus for some of the less mentally able bystanders - like myself!

cheers,

Chris

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk


From chris at simplistix.co.uk  Fri May  1 12:32:14 2009
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 01 May 2009 17:32:14 +0100
Subject: [Python-Dev] PEP 382: Namespace Packages
In-Reply-To: <20090415175704.966B13A4100@sparrow.telecommunity.com>
References: <49D4DA72.60401@v.loewis.de>
	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>
	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<20090415175704.966B13A4100@sparrow.telecommunity.com>
Message-ID: <49FB240E.8030905@simplistix.co.uk>

P.J. Eby wrote:
> At 06:15 PM 4/15/2009 +0200, M.-A. Lemburg wrote:
>> The much more common use case is that of wanting to have a base package
>> installation which optional add-ons that live in the same logical
>> package namespace.
> 
> Please see the large number of Zope and PEAK distributions on PyPI as 
> minimal examples that disprove this being the common use case.  

If you mean "the common use case as opposed to having code in the 
__init__.py of the namespace package", I think you'll find that's 
because people (especially me!) don't know how to do this, not because 
we don't want to!

Chris - who would actually like to know how to do this, with or without 
the PEP, and how to indicate interdependencies in situations like this 
to setuptools...

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk


From Scott.Daniels at Acm.Org  Fri May  1 12:33:19 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 01 May 2009 09:33:19 -0700
Subject: Passing a function as an argument from within the same class?
In-Reply-To: <abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com>
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
	<39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com>
	<abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com>
Message-ID: <tPCdne1GTdqxvmbUnZ2dnUVZ_t-dnZ2d@pdx.net>

zealalot wrote:
> On May 1, 10:50 am, CTO <debat... at gmail.com> wrote:
>> Make doNothing a classmethod.
>>
>> class SomeClass:
>>     @classmethod
>>     def doNothing(cls):
>>     ...
>>     def function2(self, passedFunction=SomeClass.doNothing):
>>         print "Running passed function"
>>         passedFunction()
>> ...
> It's not surprising, but I've never heard of a classmethod before.
> Basically, I read that it basically removes the need for the 'self'
> argument.  Very cool!

Careful, bearophiles' answer remains the best one.

The only reason your example worked is that you had already had
SomeClass defined (probably from a previous experiment).
At the time you are executing the "def" statements for the
methods of SomeClass, SomeClass is not yet defined.  the default
arguments are evaluated at "def" time, but the method body is
evaluated at methd invokation time (well past the time SomeClass
is fully built.

Typically, classmethod is used to provide alternate constructors
for a class, though it does have other uses.

--Scott David Daniels
Scott.Daniels at Acm.Org


From MrJean1 at gmail.com  Fri May  1 12:37:49 2009
From: MrJean1 at gmail.com (Jean)
Date: Fri, 1 May 2009 09:37:49 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<mailman.4898.1241167327.11746.python-list@python.org>
	<7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
Message-ID: <b44f9331-3bfe-422f-91c2-ec7dc06409db@s1g2000prd.googlegroups.com>

On May 1, 7:54?am, CTO <debat... at gmail.com> wrote:
> Not OP, but I'd actually like to know if there's an answer to this one
> that doesn't involve platform-specific tools.

Depending on what you need and the O/S you are using, this recipe may
help

  <http://code.activestate.com/recipes/286222/>

That recipe also appeared in the 2nd edition of the Python Cookbook,
see

  <http://books.google.com/books?
id=Q0s6Vgb98CQC&printsec=frontcover&dq=editions:ISBN0596001673#PPA334,M1>

/Jean Brouwers


From Scott.Daniels at Acm.Org  Fri May  1 12:40:13 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 01 May 2009 09:40:13 -0700
Subject: object query assigned variable name?
In-Reply-To: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
Message-ID: <NPSdnbVAKb1UuWbUnZ2dnUVZ_tOdnZ2d@pdx.net>

warpcat wrote:
> I've passed this around some other groups, and I'm being told
> "probably not possible".  But I thought I'd try here as well :)  ...
> Given an object:
>     class Spam(object):
>         def __init__(self):
>             # stuff....
> I'd like it to print, when instanced, something like this:
>>>> s = Spam()
> I?m assigned to s!
> 
> But it seems prohibitively hard (based on my web and forum searches)
> for an object to know what variable name is has been assigned to when
> created.

Here's an example of why it is impossibly hard.  What would you want the
following code to print?:

     print 'NoneUnique:', Spam() is Spam()

Objects are created and then used somehow (including being put
somewhere), not created int a "variable."

--Scott David Daniels
Scott.Daniels at Acm.Org



From martin at v.loewis.de  Fri May  1 12:41:03 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Fri, 01 May 2009 18:41:03 +0200
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <49FB2398.5000708@simplistix.co.uk>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB2398.5000708@simplistix.co.uk>
Message-ID: <49FB261F.9080306@v.loewis.de>

> In either of the proposals on the table, what code would I write and
> where to have a base package with a set of add-on packages?

I don't quite understand the question. Why would you want to write code
(except for the code that actually is in the packages)?

PEP 382 is completely declarative - no need to write code.

Regards,
Martin


From piet at cs.uu.nl  Fri May  1 12:46:18 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 01 May 2009 18:46:18 +0200
Subject: Multiprocessing Pool and functions with many arguments
References: <880bfeb5-cc71-4ff5-b7a6-ffd6404597f0@v23g2000pro.googlegroups.com>
Message-ID: <m2ws90py91.fsf@cs.uu.nl>

>>>>> "psaffrey at googlemail.com" <psaffrey at googlemail.com> (P) wrote:

>P> I'm trying to get to grips with the multiprocessing module, having
>P> only used ParallelPython before.

>P> based on this example:

>P> http://docs.python.org/library/multiprocessing.html#using-a-pool-of-workers

>P> what happens if I want my "f" to take more than one argument? I want
>P> to have a list of tuples of arguments and have these correspond the
>P> arguments in f, but it keeps complaining that I only have one argument
>P> (the tuple). Do I have to pass in a tuple and break it up inside f? I
>P> can't use multiple input lists, as I would with regular map.

You give the tuple of the arguments for the function:

def f(a, b, c):
    return a + b * c

pool = Pool(processes=4)              # start 4 worker processes

result = pool.apply(f, (2, 3, 4))    # evaluate "f(2, 3, 4)" 

Or if you have a list:

args = [ (2, 3, 4), # arguments for call 1
          (5, 6, 7) # arguments for call 2
        ]

print [pool.apply(f, a) for a in args]

However, as each call to apply wait for its results, this will execute
sequentially instead of parallel.

You can't use map directly as it works only with single argument functions. 
>>> print pool.map(f, args) 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/multiprocessing/pool.py", line 148, in map
    return self.map_async(func, iterable, chunksize).get()
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/multiprocessing/pool.py", line 422, in get
    raise self._value
TypeError: f() takes exactly 3 arguments (1 given)

Is that what you mean?

But you can use a wrapper function:

def wrapf(abc):
    return f(*abc)

[later...]

print pool.map(wrapf, args) 

This is covered in the examples section of multiprocessing (see
calculate and calculatestar for example).

Or you can use apply_async and later wait for the results:

results = [pool.apply_async(f, a) for a in args]
print [r.get() for r in results]

Now the calls to f are done in parallel, which you can check by putting
a sleep inside f.

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 12:48:32 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 16:48:32 GMT
Subject: object query assigned variable name?
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
Message-ID: <020b1b54$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 09:24:10 -0700, warpcat wrote:

> I'd like it to print, when instanced, something like this:
> 
>>>> s = Spam()
> I?m assigned to s!
> 
> But it seems prohibitively hard (based on my web and forum searches) for
> an object to know what variable name is has been assigned to when
> created.

Can't be done. Objects don't know what names they are bound to.

Furthermore, your question is based on an invalid assumption. Objects 
aren't necessarily bound to a single name, they can be bound to zero, 
one, or more names.

What name should Spam print in these examples?

alist = [1, 2, Spam(), 4]
alist.append(Spam())
x = y = z = Spam()



-- 
Steven


From Scott.Daniels at Acm.Org  Fri May  1 12:48:54 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 01 May 2009 09:48:54 -0700
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <mailman.4924.1241195061.11746.python-list@python.org>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<mailman.4924.1241195061.11746.python-list@python.org>
Message-ID: <Fv2dnQNefatOu2bUnZ2dnUVZ_rGdnZ2d@pdx.net>

Chris Withers wrote:
> M.-A. Lemburg wrote:
>> """
>> If the package really requires adding one or more directories on 
>> sys.path (e.g. because it has not yet been structured to support
>> dotted-name import), a "path configuration file" named package.pth
>> can be placed in either the site-python or site-packages directory....
> I'll say! I think .pth files are absolute evil and I wish they could 
> just be banned.
> +1 on anything that makes them closer to going away or reduces the 
> possibility of yet another similar feature from hurting the 
> comprehensibility of a python setup.

".pth" files are great when used in moderation. Especially when used
with the new per-user location searched when setting up sys.path.
I can move my current project's directory name into a .pth file that
I change as I switch projects.  I can also throw in a reference to
my convenience tools (dinky little functions and classes that I would
otherwise waste time scratching together each time I needed them).
They obviate the need to fiddle with site.py.

--Scott David Daniels
Scott.Daniels at Acm.Org



From chris at simplistix.co.uk  Fri May  1 12:58:18 2009
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 01 May 2009 17:58:18 +0100
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <49FB261F.9080306@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB2398.5000708@simplistix.co.uk> <49FB261F.9080306@v.loewis.de>
Message-ID: <49FB2A2A.4090606@simplistix.co.uk>

Martin v. L?wis wrote:
>> In either of the proposals on the table, what code would I write and
>> where to have a base package with a set of add-on packages?
> 
> I don't quite understand the question. Why would you want to write code
> (except for the code that actually is in the packages)?
> 
> PEP 382 is completely declarative - no need to write code.

"code" is anything I need to write to make this work...

So, what do I need to do?

Chris

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk


From jjposner at snet.net  Fri May  1 13:00:23 2009
From: jjposner at snet.net (John Posner)
Date: Fri, 01 May 2009 13:00:23 -0400
Subject: list comprehension question
In-Reply-To: <49FB2225.4030601@councilforeconed.org>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>
	<49FB2225.4030601@councilforeconed.org>
Message-ID: <49FB2AA7.6020403@snet.net>

Shane Geiger wrote:
>    if type(el) == list or type(el) is tuple:
A tiny improvement:

        if type(el) in (list, tuple):



From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 13:00:25 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 17:00:25 GMT
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
	<39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com>
	<abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com>
Message-ID: <020b1e1d$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 08:11:01 -0700, zealalot wrote:

> On May 1, 10:50?am, CTO <debat... at gmail.com> wrote:
>> Make doNothing a classmethod.
>>
>> class SomeClass:
>>
>> ? ? @classmethod
>> ? ? def doNothing(cls):
>> ? ? ? ? pass
>>
>> ? ? def function1(self):
>> ? ? ? ? print "Running function 1"
>>
>> ? ? def function2(self, passedFunction=SomeClass.doNothing):
>> ? ? ? ? print "Running passed function"
>> ? ? ? ? passedFunction()
>>
>> someObject = SomeClass()
>> someObject.function2()
>> someObject.function2(someObject.function1)
> 
> It's not surprising, but I've never heard of a classmethod before.
> Basically, I read that it basically removes the need for the 'self'
> argument.  Very cool!

Not so.

When you call an ordinary method (an "instance method"), Python 
automatically inserts the object itself as the first argument. So you 
need to define the method with one extra parameter, self.

(Using the name self is just a convention. You can call it anything you 
like.)

For classmethods, Python automatically inserts not the object itself, but 
the object's *class* as the first argument. So you still need to define 
the method with an extra parameter, only now the convention is to call is 
cls rather than self.

Here's an example:

class Test(object):
    x = 0  # class attribute
    def __init__(self, x):
        self.x = x  # instance attribute
    def spam(self):
        print self, self.x
    @classmethod
    def ham(cls):
        print cls, cls.x


And in use:

>>> t = Test(42)
>>> t.spam()
<__main__.Test object at 0xb7cccc6c> 42
>>> t.ham()
<class '__main__.Test'> 0


There is one other related built-in decorator, staticmethod(). 
staticmethod() tells Python not to pass any extra argument to the method. 
That means the inside a static method, you can't refer to either the 
instance (self) or the class! Needless to say, there aren't very many 
uses for staticmethod(). 



-- 
Steven


From drobinow at gmail.com  Fri May  1 13:03:56 2009
From: drobinow at gmail.com (David Robinow)
Date: Fri, 1 May 2009 13:03:56 -0400
Subject: object query assigned variable name?
In-Reply-To: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
Message-ID: <4eb0089f0905011003i49237d89w7e81f23b704d5aa9@mail.gmail.com>

On Fri, May 1, 2009 at 12:24 PM, warpcat <warpcat at sbcglobal.net> wrote:
> I've passed this around some other groups, and I'm being told
> "probably not possible". ?But I thought I'd try here as well :) ? I
> *did* search first, and found several similar threads, but they
> quickly tangented into other specifics of the language that were a bit
> over my head :) ?At any rate, here's a simple example, I'd love to
> know if as shown, is somehow possible:
>
> Given an object:
>
> class Spam(object):
> ? ?def __init__(self):
> ? ? ? ?# stuff....
>
> I'd like it to print, when instanced, something like this:
>
>>>> s = Spam()
> I?m assigned to s!
>
> But it seems prohibitively hard (based on my web and forum searches)
> for an object to know what variable name is has been assigned to when
> created. ?Querying 'self' in __init__ returns a memory location, not
> the variable name passed in.
>
> If you're wondering why I'm trying to figure this out, this is just
> part of my continued learning of the language and pushing the bounds,
> to see what is possible ;)
>
> Any thoughts?
> --
> http://mail.python.org/mailman/listinfo/python-list
>
Others have explained to you that this is not possible.
I'll just point out that your method for learning the language is not optimal.
If you had gotten a recipe to do what you asked, how would it help you
write better programs?
I suggest that you start programming. If you get stumped, feel free to ask here.


From warpcat at sbcglobal.net  Fri May  1 13:08:55 2009
From: warpcat at sbcglobal.net (AKEric)
Date: Fri, 1 May 2009 10:08:55 -0700 (PDT)
Subject: object query assigned variable name?
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
	<020b1b54$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <4ad92d8b-7c06-47ad-b3f4-a0da02498d81@s38g2000prg.googlegroups.com>

On May 1, 9:48?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Fri, 01 May 2009 09:24:10 -0700, warpcat wrote:
> > I'd like it to print, when instanced, something like this:
>
> >>>> s = Spam()
> > I?m assigned to s!
>
> > But it seems prohibitively hard (based on my web and forum searches) for
> > an object to know what variable name is has been assigned to when
> > created.
>
> Can't be done. Objects don't know what names they are bound to.
>
> Furthermore, your question is based on an invalid assumption. Objects
> aren't necessarily bound to a single name, they can be bound to zero,
> one, or more names.
>
> What name should Spam print in these examples?
>
> alist = [1, 2, Spam(), 4]
> alist.append(Spam())
> x = y = z = Spam()
>
> --
> Steven

And getting back all the pointers is fine with me.  But this sounds
like a dead end, and I was just looking for confirmation of that.
Thanks


From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 13:09:21 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 17:09:21 GMT
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
Message-ID: <020b2035$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 07:35:40 -0700, zealalot wrote:

> So, I'm trying to come up with a way to pass a method (from the same
> class) as the default argument for another method in the same class.
> Unfortunately though, I keep getting "self not defined" errors since the
> class hasn't been read completely before it references itself.
> 
> Is there a better way of doing this?

My first instinct is to say "Don't do that!", but let's see if there's a 
way to get what you want. It's actually very easy: just put the 
definition of the passed method before the method you want to use it in, 
then refer to it by name *without* self.

However, there is a catch: you need to manually pass in the instance, 
instead of letting Python do it for you.

class Spam(object):
    def ham(self):
        return "ham"
    def spam(self, func=ham):
        return "spam is a tasty %s-like food product" % func(self)


And in use:

>>> obj = Spam()
>>> obj.ham()
'ham'
>>> obj.spam()
'spam is a tasty ham-like food product'



-- 
Steven


From warpcat at sbcglobal.net  Fri May  1 13:16:26 2009
From: warpcat at sbcglobal.net (AKEric)
Date: Fri, 1 May 2009 10:16:26 -0700 (PDT)
Subject: object query assigned variable name?
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
	<mailman.4931.1241197439.11746.python-list@python.org>
Message-ID: <030ba85c-7b3a-47e3-a38d-338e04104579@x1g2000prh.googlegroups.com>

On May 1, 10:03?am, David Robinow <drobi... at gmail.com> wrote:
> On Fri, May 1, 2009 at 12:24 PM, warpcat <warp... at sbcglobal.net> wrote:
> > I've passed this around some other groups, and I'm being told
> > "probably not possible". ?But I thought I'd try here as well :) ? I
> > *did* search first, and found several similar threads, but they
> > quickly tangented into other specifics of the language that were a bit
> > over my head :) ?At any rate, here's a simple example, I'd love to
> > know if as shown, is somehow possible:
>
> > Given an object:
>
> > class Spam(object):
> > ? ?def __init__(self):
> > ? ? ? ?# stuff....
>
> > I'd like it to print, when instanced, something like this:
>
> >>>> s = Spam()
> > I?m assigned to s!
>
> > But it seems prohibitively hard (based on my web and forum searches)
> > for an object to know what variable name is has been assigned to when
> > created. ?Querying 'self' in __init__ returns a memory location, not
> > the variable name passed in.
>
> > If you're wondering why I'm trying to figure this out, this is just
> > part of my continued learning of the language and pushing the bounds,
> > to see what is possible ;)
>
> > Any thoughts?
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> Others have explained to you that this is not possible.
> I'll just point out that your method for learning the language is not optimal.
> If you had gotten a recipe to do what you asked, how would it help you
> write better programs?
> I suggest that you start programming. If you get stumped, feel free to ask here.

wow

No one has yet told me it isn't possible (until other posts in this
thread), they just alluded to it.  Common replies are "well, maybe
this way, or maybe that way".  I myself help on other language forums
(that I know far better than Python), and sometimes it's helpful for
someone to just say "no, you can't do it" (if you truly know you
can't), which is what I was looking for here.

But to argue the way I'm learning the language isn't optimal is a bit
short-sited, based on a single-post query.  It's valuable to both know
what you can, can't, should and shouldn't do, and one shouldn't be
debased for asking such questions.


From norseman at hughes.net  Fri May  1 13:19:15 2009
From: norseman at hughes.net (norseman)
Date: Fri, 01 May 2009 10:19:15 -0700
Subject: Importing modules
In-Reply-To: <op.us77a7bsx6zn5v@lepton.softlabbsas.com.ar>
References: <b6671f88-bc04-42eb-aad1-5b212bcab1ef@z23g2000prd.googlegroups.com>	<87tz48s7hm.fsf@benfinney.id.au>	<52d28fba-ebf7-4bfb-b568-64304da650d5@w31g2000prd.googlegroups.com>	<pan.2009.04.29.06.27.10@REMOVE.THIS.cybersource.com.au>	<17bacf12-037f-4dda-8ee3-1b51d83ac654@z23g2000prd.googlegroups.com>	<4eb0089f0904291713m3859c90yd0298a740967b149@mail.gmail.com>	<b1d973a70904291801q39854313ic4ca35863580a52a@mail.gmail.com>	<mailman.4818.1241065035.11746.python-list@python.org>	<a4d6108f-13d5-4adb-8bcc-c9772ea3af1f@d19g2000prh.googlegroups.com>	<49f9e0f8$0$7893$9a6e19ea@unlimited.newshosting.com>
	<op.us77a7bsx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <49FB2F13.4040906@hughes.net>

Gabriel Genellina wrote:
> En Thu, 30 Apr 2009 14:33:38 -0300, Jim Carlock escribi?:
> 
>> I'm messing around with a program right at the moment. It
>> ends up as two applications, one runs as a server and one
>> as a client which presents a Window. It almost works, so I
>> need to work through it to work out it's bugs, and I'll be
>> rewriting it in a couple other languages.
>>
>> Python looks fairly simple. It's a lot of "import" commands
>> and then "from" statements to do more importing. So I need
>> to figure out what the difference is between the two, as
>> the "from" seems to provide a way to identify what it wants
>> to import from the library/module.
> 
> Start by reading http://docs.python.org/tutorial
> In particular, section 6: Modules
> 
>> I find it odd that no one includes the FQFN and employs a
>> short name.
> 
> fully.qualified.module.name is long to type, error prone, and slow -- 
> Python has to resolve each dotted name at runtime, every time it's used.
> 
> So writting this is common:
> from fully.qualified.module import name
> and then, just use `name` in the code. By looking at the `import` lines, 
> usually located at the top, you know where a certain name comes from.
> 
> ...unless there are statements like this:
> from somemodule import *
> which are considered bad practice anyway.
> 
>> Nothing seems to get SET in the Environment to
>> identify where the library gets configured. I have to run
>> off to find help on the differences between "import" and
>> "from".
> 
> No need for that, usually. There is a default library search path that 
> is built relative to the interpreter location. That is, if the Python 
> interpreter used is /usr/some/fancy/directory/python, then the standard 
> library is at /usr/some/fancy/directory/lib/python2.6, additional 
> packages are at /usr/some/fancy/directory/lib/python2.6/site-packages, etc.
> 
> You *can* alter the search path by setting some environment variables, 
> but I don't like that.
> 
------------------------------
I would like to make a small comment here on Python locations.
Windows seems to have to have a slight difference.

...\python\Lib                   #py libs go here
...\pythonVer\Lib\site-packages  #addons usually go here same as Linux
...\pythonVer\libs             #seems to hold MicroSoft specific py libs


Like Gabriel - my Linux is same as he describes.
                except I don't have a /usr/...ory/python
                in my case it's all in   /usr/local/lib/python2.5
                  to keep it all in one place
                  /usr/local/bin   has the soft links to run it
                  (reduces PATH size.  /usr/local/bin  already there)

Which shows how flexible Python is.


OH - something you mentioned that didn't seem to be addressed.
import - load a complete library
from   - obtain specific 'function'(s) from a library

(from mylib import fopen, fclose     or  from mylib import f*
                    one or more           gets fopen, fclose, etc

  from mylib import fopen as myfopen   can be useful  myfopen(...)
                                       won't be confused with the system
                                       fopen(...)
  which is great for not having to  MyVeryLongNameLib.fopen()  :)
)

The cautionary note here is, IF two libs have a function with the same 
name and 'from' is used to get it from each, you wind up the last one
requested.
To alleviate the problem you can  open(...)  or mylib.open(...) and thus 
access both (or even more) in the same program.  Check the built-ins and 
the libs for name problems and use the techniques noted to get what you 
want.

Not sure what is in a given library?
import somelib
help(somelib)
   (and read)

When it come to showing off, Python has its moments!

HTH

Steve


From debatem1 at gmail.com  Fri May  1 13:26:12 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 1 May 2009 10:26:12 -0700 (PDT)
Subject: Passing a function as an argument from within the same class?
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
	<39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com> 
	<abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com> 
	<tPCdne1GTdqxvmbUnZ2dnUVZ_t-dnZ2d@pdx.net>
Message-ID: <8ac8111d-4f02-4de0-9c66-28b4efa004c3@k38g2000yqh.googlegroups.com>

> Careful, bearophiles' answer remains the best one.
>
> The only reason your example worked is that you had already had
> SomeClass defined (probably from a previous experiment).

Scott is correct, and if bearophile and I ever give you conflicting
advice, take bearophile's.

A (corrected) bit of code that might serve your purpose would be
as follows:

class SomeClass:

    def doNothing():
        pass

    def function1(self):
        print "running function 1"

    def function2(self, passedFunction=doNothing):
        print "running passed function"
        passedFunction()

again, though- bearophile's is the best, and most standard,
answer here


From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 13:33:03 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 May 2009 17:33:03 GMT
Subject: object query assigned variable name?
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
	<mailman.4931.1241197439.11746.python-list@python.org>
Message-ID: <020b25c3$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 13:03:56 -0400, David Robinow wrote:

> Others have explained to you that this is not possible. I'll just point
> out that your method for learning the language is not optimal. If you
> had gotten a recipe to do what you asked, how would it help you write
> better programs?

Exactly the same way that knowing that lists have an append() method, but 
dicts do not, will help you to write better programs. If you don't know 
what tools the language offers, how are you supposed to write *any* 
programs, let alone "better" ones?


> I suggest that you start programming. If you get stumped, feel free to
> ask here.

There's nothing wrong with experimenting with your tools, getting a feel 
for what they can do, pushing the boundaries with them. You might not get 
any useful code out of such games, but when you start writing code, you 
will already know what tools are available.

Warpcat, don't be ashamed about experimenting with Python and learning 
the language before getting into "serious" programming. There's 
absolutely nothing wrong with such curiosity.


-- 
Steven


From emile at fenx.com  Fri May  1 13:36:25 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 01 May 2009 10:36:25 -0700
Subject: list comprehension question
In-Reply-To: <m263gk6bjq.fsf@googlemail.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>	<85ocucnbce.fsf@agentultra.com>	<mailman.4923.1241193638.11746.python-list@python.org>
	<m263gk6bjq.fsf@googlemail.com>
Message-ID: <gtfbsu$qf4$1@ger.gmane.org>

On 5/1/2009 9:19 AM Arnaud Delobelle said...
> Emile van Sebille <emile at fenx.com> writes:
>> On 5/1/2009 7:31 AM J Kenneth King said...
>>> I love comprehensions, but abusing them can lead to really dense and
>>> difficult to read code.
>> I disagree on dense and difficult, although I'll leave open the
>> question of abuse.
>>
>> b = [ item for pair in a for item in pair ]
>>
>> This is exactly the code above expressed in comprehension form.
> 
> If the comprehension above is an abuse, then every nested list
> comprehension is an abuse of comprehensions so they might as well not be
> in the language...
> 

I hope you didn't understand me to say that this usage is abuse.  That's 
certainly not what I mean.  I have, however, examples in my code base 
that _would_ qualify as abuse (mostly from pre dictionary comprehension 
vintage where I would build a dict from within a list comp), and I have 
seen enough from this group to know that abuse abounds, with only slight 
provocation.  :)

Fondly-remembering-byte-code-hacks-and-introspection-ly y'rs,

Emile



From martin at v.loewis.de  Fri May  1 13:38:12 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Fri, 01 May 2009 19:38:12 +0200
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <49FB2A2A.4090606@simplistix.co.uk>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB2398.5000708@simplistix.co.uk> <49FB261F.9080306@v.loewis.de>
	<49FB2A2A.4090606@simplistix.co.uk>
Message-ID: <49FB3384.1030106@v.loewis.de>

>>> In either of the proposals on the table, what code would I write and
>>> where to have a base package with a set of add-on packages?
>>
>> I don't quite understand the question. Why would you want to write code
>> (except for the code that actually is in the packages)?
>>
>> PEP 382 is completely declarative - no need to write code.
> 
> "code" is anything I need to write to make this work...
> 
> So, what do I need to do?

Ok, so create three tar files:

1. base.tar, containing

   simplistix/
   simplistix/__init__.py

2. addon1.tar, containing

   simplistix/addon1.pth (containing a single "*")
   simplistix/feature1.py

3. addon2.tar, containing

   simplistix/addon2.pth
   simplistix/feature2.py

Unpack each of them anywhere on sys.path, in any order.

Regards,
Martin


From mabdelkader at gmail.com  Fri May  1 13:39:39 2009
From: mabdelkader at gmail.com (ma)
Date: Fri, 1 May 2009 13:39:39 -0400
Subject: ctypes: reference of a struct member?
Message-ID: <148918f0905011039t1a9a8561nf36c6fe4534e3694@mail.gmail.com>

If I have this struct in C:

struct spam {
     int ham;
  char foo;
};


if I have this declaration:
struct spam s_;

If I wanted to pass a reference to a function of s_'s foo character, I
can do something like this:

somefunc(&s_.foo)

How do I do the same thing in ctypes?
ctypes.addressof(s_) + ctypes.sizeof(spam.foo)*(1)


From arnodel at googlemail.com  Fri May  1 13:52:30 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 01 May 2009 18:52:30 +0100
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<m263gk6bjq.fsf@googlemail.com>
	<mailman.4933.1241199339.11746.python-list@python.org>
Message-ID: <m21vr8678h.fsf@googlemail.com>

Emile van Sebille <emile at fenx.com> writes:

> On 5/1/2009 9:19 AM Arnaud Delobelle said...
>> Emile van Sebille <emile at fenx.com> writes:
>>> On 5/1/2009 7:31 AM J Kenneth King said...
>>>> I love comprehensions, but abusing them can lead to really dense and
>>>> difficult to read code.
>>> I disagree on dense and difficult, although I'll leave open the
>>> question of abuse.
>>>
>>> b = [ item for pair in a for item in pair ]
>>>
>>> This is exactly the code above expressed in comprehension form.
>>
>> If the comprehension above is an abuse, then every nested list
>> comprehension is an abuse of comprehensions so they might as well not be
>> in the language...
>>
>
> I hope you didn't understand me to say that this usage is abuse.

Emile: sorry, the way I was quoting earlier posts was unclear.  I was
refering to the post you quoted in your message, which describe the
nested list comprehension as abuse.  As supporting evidence for my reply
I included your example of nested list comprehension, which is one of
the simplest possible ones one can think of.

-- 
Arnaud


From debatem1 at gmail.com  Fri May  1 13:56:06 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 1 May 2009 10:56:06 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<mailman.4898.1241167327.11746.python-list@python.org>
	<7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
	<mailman.4921.1241190260.11746.python-list@python.org>
Message-ID: <ff9a9718-73a5-45f9-8c29-512cd344ac8b@r37g2000yqn.googlegroups.com>

> sys.getsizeof() [a suggested solution] isn't platform-specific.

So, to answer the OP's question, you'd just do something like

def get_totalsize(obj):
	total_size = sys.getsizeof(obj)
	for value in vars(obj).values():
		try: total_size += get_total_size(value)
		except: total_size += sys.getsizeof(value)
	return totalSize

def get_current_size(env):
	size = 0
	for value in env.values():
		try: size += get_total_size(value)
		except: pass
	return size

get_current_size(vars())

and discount the weight of the interpreter?


From shailen.tuli at gmail.com  Fri May  1 14:18:10 2009
From: shailen.tuli at gmail.com (shailen.tuli at gmail.com)
Date: Fri, 1 May 2009 11:18:10 -0700 (PDT)
Subject: urllib2 and threading
References: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
	<49fb2363$0$31865$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <2a5530c7-4442-45f1-bd36-4e708553e665@c18g2000prh.googlegroups.com>

For better performance, lxml easily outperforms Beautiful Soup.

For what its worth, the code runs fine if you switch from urllib2 to
urllib (different exceptions are raised, obviously). I have no
experience using urllib2 in a threaded environment, so I'm not sure
why it breaks; urllib does OK, though.

- Shailen

On May 1, 9:29?am, Stefan Behnel <stefan... at behnel.de> wrote:
> robean wrote:
> > I am writing a program that involves visiting several hundred webpages
> > and extracting specific information from the contents. I've written a
> > modest 'test' example here that uses a multi-threaded approach to
> > reach the urls with urllib2. The actual program will involve fairly
> > elaborate scraping and parsing (I'm using Beautiful Soup for that)
>
> Try lxml.html instead. It often parses HTML pages better than BS, can parse
> directly from HTTP/FTP URLs, frees the GIL doing so, and is generally a lot
> faster and more memory friendly than the combination of urllib2 and BS,
> especially when threading is involved. It also supports CSS selectors for
> finding page content, so your "elaborate scraping" might actually turn out
> to be a lot simpler than you think.
>
> http://codespeak.net/lxml/
>
> These might be worth reading:
>
> http://blog.ianbicking.org/2008/12/10/lxml-an-underappreciated-web-sc...http://blog.ianbicking.org/2008/03/30/python-html-parser-performance/
>
> Stefan



From debatem1 at gmail.com  Fri May  1 14:28:06 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 1 May 2009 11:28:06 -0700 (PDT)
Subject: ctypes: reference of a struct member?
References: <mailman.4935.1241199602.11746.python-list@python.org>
Message-ID: <ec4de350-61e4-45e9-a790-d42e80f74926@b1g2000vbc.googlegroups.com>

ctypes.byref()



From nick at craig-wood.com  Fri May  1 14:30:05 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Fri, 01 May 2009 13:30:05 -0500
Subject: object query assigned variable name?
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
Message-ID: <slrngvmfdn.bke.nick@irishsea.home.craig-wood.com>

warpcat <warpcat at sbcglobal.net> wrote:
>  I've passed this around some other groups, and I'm being told
>  "probably not possible".  But I thought I'd try here as well :)   I
>  *did* search first, and found several similar threads, but they
>  quickly tangented into other specifics of the language that were a bit
>  over my head :)  At any rate, here's a simple example, I'd love to
>  know if as shown, is somehow possible:
> 
>  Given an object:
> 
>  class Spam(object):
>      def __init__(self):
>          # stuff....
> 
>  I'd like it to print, when instanced, something like this:
> 
> >>> s = Spam()
>  I?m assigned to s!
> 
>  But it seems prohibitively hard (based on my web and forum searches)
>  for an object to know what variable name is has been assigned to when
>  created.  Querying 'self' in __init__ returns a memory location, not
>  the variable name passed in.
> 
>  If you're wondering why I'm trying to figure this out, this is just
>  part of my continued learning of the language and pushing the bounds,
>  to see what is possible ;)
> 
>  Any thoughts?

Read up on introspection and learn how to look up through the stack
frames.

When you've mastered that look for an object matching self in all the
locals in those stack frames.

That will give some kind of answer.

I have no idea whether this will work - the keyboard of my phone is
too small to produce a proof ;-)

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From davea at ieee.org  Fri May  1 14:47:30 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 01 May 2009 14:47:30 -0400
Subject: Passing a function as an argument from within the same class?
In-Reply-To: <abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com>
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>	<39845303-4a6a-4762-8be2-0b23c9ca6f8f@d2g2000pra.googlegroups.com>
	<abc17c86-e39b-455c-bbb7-f9c124561026@d7g2000prl.googlegroups.com>
Message-ID: <49FB43C2.6040801@ieee.org>

zealalot wrote:
> On May 1, 10:50 am, CTO <debat... at gmail.com> wrote:
>   
>> Make doNothing a classmethod.
>>
>> class SomeClass:
>>
>>     @classmethod
>>     def doNothing(cls):
>>         pass
>>
>>     def function1(self):
>>         print "Running function 1"
>>
>>     def function2(self, passedFunction=meClass.doNothing):
>>         print "Running passed function"
>>         passedFunction()
>>
>> someObject =omeClass()
>> someObject.function2()
>> someObject.function2(someObject.function1)
>>     
>
> It's not surprising, but I've never heard of a classmethod before.
> Basically, I read that it basically removes the need for the 'self'
> argument.  Very cool!
>
> And thanks for the quick response,
>
> - Zealalot
>
>   
As you've probably figured out by now, that also gets an error, since 
you can't refer to the SomeClass  until the definition is complete.  
Better is either the sentinel approach, or defining the function outside 
the class.  Note that since the signature must match the passed 
function, you presumably need neither a self nor a cls.  So keep it 
simple and define doNothing as a top-level function.

But it's worth expanding on the notion of a classmethod.  This type of 
function is callable with any object, or just with the class name 
itself.  But it doesn't have an access to instance attributes.  That's 
good, but not very common.  Class attributes are more common, and 
they're attributes which are shared among all the objects of the class.




From mabdelkader at gmail.com  Fri May  1 14:57:03 2009
From: mabdelkader at gmail.com (ma)
Date: Fri, 1 May 2009 14:57:03 -0400
Subject: ctypes: reference of a struct member?
In-Reply-To: <ec4de350-61e4-45e9-a790-d42e80f74926@b1g2000vbc.googlegroups.com>
References: <mailman.4935.1241199602.11746.python-list@python.org> 
	<ec4de350-61e4-45e9-a790-d42e80f74926@b1g2000vbc.googlegroups.com>
Message-ID: <148918f0905011157p19f49d8aha4afda704ab2824b@mail.gmail.com>

ctypes.byref() does not work for struct members.
Try it out.
class s(ctypes.Structure):
    _fields_ = [('x',ctypes.c_int)]

a = s()
ctypes.byref(a.x) //this won't work.



On Fri, May 1, 2009 at 2:28 PM, CTO <debatem1 at gmail.com> wrote:
> ctypes.byref()
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From Scott.Daniels at Acm.Org  Fri May  1 15:03:39 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 01 May 2009 12:03:39 -0700
Subject: list comprehension question
In-Reply-To: <mailman.4930.1241197210.11746.python-list@python.org>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>	<49FB2225.4030601@councilforeconed.org>
	<mailman.4930.1241197210.11746.python-list@python.org>
Message-ID: <0_qdnYwTacv122bUnZ2dnUVZ_rqdnZ2d@pdx.net>

John Posner wrote:
> Shane Geiger wrote:
>>    if type(el) == list or type(el) is tuple:
> A tiny improvement:
> 
>        if type(el) in (list, tuple):

or (even better)
     if isinstance(el, (list, tuple))

However, it is my contention that you shouldn't be flattening by type --
you should know where, explicitly to flatten.  If I have 3-D points as
triples, a tree of points would, by this code, get flattened into a
a list of numbers.   If, however, I create a class with the same
elements, but a method or two, suddenly flatten will produce a list
of points.  It is my contention that the tree abstraction should be
responsible for producing its leaves, rather than a blunderbus that
doesn't know where one container abstraction ends, and its contents
begin.  In other words, I'd like to see thigs like "flatten one layer."

--Scott David Daniels
Scott.Daniels at Acm.Org


From norseman at hughes.net  Fri May  1 15:04:48 2009
From: norseman at hughes.net (norseman)
Date: Fri, 01 May 2009 12:04:48 -0700
Subject: don't understand namespaces...
In-Reply-To: <f355917c-3c51-4903-a529-52aa8c53dd2f@u9g2000pre.googlegroups.com>
References: <mailman.4846.1241100718.11746.python-list@python.org>
	<f355917c-3c51-4903-a529-52aa8c53dd2f@u9g2000pre.googlegroups.com>
Message-ID: <49FB47D0.4040600@hughes.net>

Simon Forman wrote:
> On Apr 30, 10:11 am, Lawrence Hanser <lhan... at gmail.com> wrote:
>> Dear Pythoners,
>>
>> I think I do not yet have a good understanding of namespaces.  Here is
>> what I have in broad outline form:
>>
>> ------------------------------------
>> import Tkinter
>>
>> Class App(Frame)
>>       define two frames, buttons in one and Listbox in the other
>>
>> Class App2(Frame)
>>       define one frame with a Text widget in it
>>
>> root = Tk()
>> app = App(root)
>> win2 = Toplevel(root)
>> app2 = App2(win2)
>> root.mainloop()
>> ------------------------------------
>>
>> My understanding of the above goes like this:
>> 1) create a root window
>> 2) instantiate a class that defines a Frame in the root window
>> 3) create another Toplevel window
>> 4) instantiate another class that defines a frame in the Toplevel window (win2)
>>
>> What I cannot figure out is how to reference a widget in app2 from app...
>>
>> I hope this is sort of clear.
>>
>> Any assistance appreciated.
>>
>> Thanks,
>>
>> Larry
> 
...(snip) # you already have Simon's approach and I'm just shorting the 
overall reply.

---------------------------------

IF you think each widget is supposed to be a program,
  I would have to say NO!

Each widget is just a pretty interface to the human.

build your program!
use the GUI to communicate with the human IN LIEU OF A COMMAND LINE. !!
That is all the GUI is for.!!!!(teacher stomping foot, shaking finger :)

instead of print()  do  msgbox()
instead of getch()  do  textbox()
instead of (command line thingy) do (GUI thingy)

and so on.
Your program is a program.
It just communicates differently.
Remember: Designing for the clicker is designing for the brain dead. :)
           (True - not in all cases, but mostly)

import Tkinter
help(Tkinter)
   (read!)

in short

import Tkinter               # load lib

root= Tk                     # use template, go live

main= Frame(root,...         # the mockup board
frame1= Frame(main,...       # frame1 will be found inside main
frame2= Frame(main,....      # frame2 will be found inside main
button1= Button(frame1,...   # button1 will be found inside frame1
frame3= Frame(root,...       # frame3 will float about on its own
msgbox1= MsgBox(where,...    # and so it goes
.
.
root.mainloop()              # run it

Those widgets with a callback= allowed can send their answers to a 
function that has has been defined previously *above* in the code.

MyYNVal= StrVal()             # here they are before example below
MyYNVal.set("*")              # to be used with above example they
                               #
                               #
def somehandler():            # need to be in same order and
   a_global= MyYNVal.get()     # before the root= line
   root.quit()                 #



rbframe= Frame(Tk,...
rb1= Radiobutton(rbframe,....., variable=MyYNVal, value= "N", 
command=somehandler, ... )
rb2= Radiobutton(rbframe,....., variable=MyYNVal, value= "Y", 
command=somehandler, ... )



program calls GUI    # how?  encapsulate widgets in a   def name()
                      # name()
human pushes button of choice which sets MyYNVal and calls somehandler
                                                 which returns to program
human_said= a_global
if human_said == "Y":
   program process accordingly
else:
   program process accordingly
.
.

Does that help?

And Yes - you can pre-edit/validate the GUI entries while still in the 
GUI. It gets a bit complicated because anything Tkinter is to use is 
already defined by time of use.  Read that sentence again.
(One pass interpreter. The pre-scan is for syntax only. It does not
   build address or set variables until actual run.
)


Today: 20090430
snippets are generalized for concept

HTH
Steve


From mabdelkader at gmail.com  Fri May  1 15:08:43 2009
From: mabdelkader at gmail.com (ma)
Date: Fri, 1 May 2009 15:08:43 -0400
Subject: fcntl and siginfo_t in python
In-Reply-To: <148918f0904301637t5e63537atd85e2a475f4e069f@mail.gmail.com>
References: <148918f0904281356v534680dcmd03084fe255cb2d3@mail.gmail.com> 
	<op.us4mtvitx6zn5v@lepton.softlabbsas.com.ar>
	<148918f0904291012j4c1ada35jcee6030b75b952d0@mail.gmail.com> 
	<loom.20090430T233215-925@post.gmane.org>
	<148918f0904301637t5e63537atd85e2a475f4e069f@mail.gmail.com>
Message-ID: <148918f0905011208u4946c377uce7603bb2e456370@mail.gmail.com>

According to man signal,
"The default action for an unhandled real-time signal is to terminate
the receiving process."

This means that my registered callback and sigaction does not work. I
think the only solution would be to try this with a C-extension. Has
anyone had any experience with this before?

I attached my latest copy. Any insight is appreciated.

On Thu, Apr 30, 2009 at 7:37 PM, ma <mabdelkader at gmail.com> wrote:
> I attached a clean copy of the .py file in case others couldn't read
> it in their emails.
> I'll try that and let you know how?SIGRTMIN+1 goes!
> What about this part?
>
> #sigemptyset(&act.sa_mask);
> #python2.6 has byref(act, offset),how can i port this over?
> #maybe addressof(act)+sizeof(sigaction.sa_mask)*(position_in_sigaction)
> rc = __clib.sigemptyset(byref(act))
>
> Thanks!
> Mahmoud
>
>
>
> On Thu, Apr 30, 2009 at 7:33 PM, Philip <philip at subaru.naoj.org> wrote:
>>
>> ma <mabdelkader <at> gmail.com> writes:
>>
>> >
>> >
>> >
>> >
>> > Here's something that I came up with so far, I'm having some issues with
>> segfaulting, if I want to pass a struct member by ref in ctypes(see below), if
>> not, I just get a
>> > "Real-time signal 0" sent back to me.
>> >
>> >
>> > Any ideas?
>>
>> Try "SIGRTMIN+1", per http://souptonuts.sourceforge.net/code/dnotify.c.html
>>
>> Philip
>>
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>
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From mail at timgolden.me.uk  Fri May  1 15:13:13 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 01 May 2009 20:13:13 +0100
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <49FB22B5.3040507@simplistix.co.uk>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB22B5.3040507@simplistix.co.uk>
Message-ID: <49FB49C9.9060901@timgolden.me.uk>

Chris Withers wrote:
> I'll say! I think .pth files are absolute evil and I wish they could 
> just be banned.
> 
> +1 on anything that makes them closer to going away or reduces the 
> possibility of yet another similar feature from hurting the 
> comprehensibility of a python setup.

I've seen this view expressed by you (and others) a number
of times, but I use them myself in my admittedly simple
circumstances without any problem. Would you mind sharing
what's so bad about them?

TJG



From Scott.Daniels at Acm.Org  Fri May  1 15:13:58 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 01 May 2009 12:13:58 -0700
Subject: Passing a function as an argument from within the same class?
In-Reply-To: <020b2035$0$20667$c3e8da3@news.astraweb.com>
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
	<020b2035$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <reGdnRRame9P1WbUnZ2dnUVZ_qOdnZ2d@pdx.net>

Steven D'Aprano wrote:
> On Fri, 01 May 2009 07:35:40 -0700, zealalot wrote:
>> So, I'm trying to come up with a way to pass a method (from the same
>> class) as the default argument for another method in the same class....
> 
> My first instinct is to say "Don't do that!", but let's see if there's a 
> way to get what you want. It's actually very easy: just put the 
> definition of the passed method before the method you want to use it in, 
> then refer to it by name *without* self.
> 
> However, there is a catch: you need to manually pass in the instance, 
> instead of letting Python do it for you.
> 
> class Spam(object):
>     def ham(self):
>         return "ham"
>     def spam(self, func=ham):
>         return "spam is a tasty %s-like food product" % func(self)

But you don't quite get the behavior the OP wanted, which was to allow
(text-producing in this case) methods as the argument:

 >>> obj = Spam()
 >>> obj.spam()
  'spam is a tasty ham-like food product'
 >>> obj.spam(obj.ham)
Traceback (most recent call last):
   File "<pyshell#271>", line 1, in <module>
     obj.spam(obj.ham)
   File "<pyshell#268>", line 5, in spam
     return "spam is a tasty %s-like food product" % func(self)
TypeError: ham() takes exactly 1 argument (2 given)

Now it is tough to use obj.

--Scott David Daniels
Scott.Daniels at Acm.Org


From davea at ieee.org  Fri May  1 15:45:30 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 01 May 2009 15:45:30 -0400
Subject: wxPython having trouble with frame objects
In-Reply-To: <f6a09c160905011014y47cd3158x2a40f8f38cf2b944@mail.gmail.com>
References: <mailman.4886.1241142872.11746.python-list@python.org>	
	<5ddd5a7f-8c2b-4f39-a89e-376a3d646caf@t36g2000prt.googlegroups.com>	
	<f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com>	
	<49FA8024.3060608@ieee.org>	
	<f6a09c160904302212p7b9bb797m4e6942c2de12e10a@mail.gmail.com>	
	<49FAFBCF.2010105@dejaviewphoto.com>
	<f6a09c160905011014y47cd3158x2a40f8f38cf2b944@mail.gmail.com>
Message-ID: <49FB515A.7070302@ieee.org>

Soumen banerjee wrote:
> Hello,
> The code works almost perfectly. I was able to correct some small
> things, and get it to work brilliantly. I would like to thank you for
> your dedicated help. My understanding of the matter here has improved
> by a lot due to your kind help. I will further work on your
> suggestions. By the way why should the general rule in 5 apply with
> respect to private and global variables?
> Regards
> Soumen
>
> On Fri, May 1, 2009 at 7:10 PM, Dave Angel <davea at dejaviewphoto.com> wrote:
>   
>> Soumen banerjee wrote:
>>     
> <snip>
You accidentally top-posted, so your response is at the beginning, 
rather than in sequence. You also forgot to CC the PythonList, so nobody 
else will see it.

One typo I thought of after hitting "send" was I omitted the 'self' 
parameter when calling the parent __init__() methods.

function variables are preferred over globals for several reasons.  One 
is that there's less likelihood of accidentally getting the wrong 
value.  If two different functions use the same name for something, 
there's no confusion unless one of them decides to make it global.  This 
is referred to as namespace pollution.  Generally, the fewer names that 
are visible at any moment, the better.  Much better to get an error than 
use the worng one.  Other namespace cases is my preference of simple 
import over   from xxx import yyy.  It means that a reference to 
something from the import takes more typing, but is clearer to the reader.

Second problem with globals is that if you write a successful program to 
do something once, it very well might not work if you just repeat it,  
because you might forget to re-initialize the globals.  If this were the 
only problem, I might solve it by making a "init_globals()" function 
that uses the global keyword to export the names it's initializing.  
Then make sure you run init_globals() before running main().  
Unfortunately, there are more problems, so forget this "solution."

Third problem with globals is involved in refactoring.  When you first 
write a glob of code, you tend to put lots in one module.  Then when you 
better understand it, you refactor it into separate modules.  If it was 
coded with globals, this refactoring is much more painful.

Fourth problem with globals is in multithreading.  Any reference to 
mutable shared information has to be considered carefully, and each 
global is a potential hazard.

So, are there uses for globals?  Certainly.   First use, simple utility 
programs that fit in one file, run non-interactively, and for whom 
development pretty much stops when they "work."  Second, any immutable 
variable, whether or not it's literally protected.  There are many of 
these already in the system.  For example, all your function names are 
global variables.  Third, the system already defines some, such as in 
the sys module.  Some of these are constant, such as the path 
separator.  Others are changeable, but not usually while the application 
is running, like sys.path.

If you have to define new ones, either put them in a separate module (as 
sys does), or put them in a single class, as instance attributes.  Then, 
when refactoring, at least you only have one thing that's got to 
beshared between modules.  Any any code that refers to them will be 
using the same name for them.




From MrJean1 at gmail.com  Fri May  1 15:50:55 2009
From: MrJean1 at gmail.com (Jean)
Date: Fri, 1 May 2009 12:50:55 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<mailman.4898.1241167327.11746.python-list@python.org>
	<7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
	<mailman.4921.1241190260.11746.python-list@python.org>
	<ff9a9718-73a5-45f9-8c29-512cd344ac8b@r37g2000yqn.googlegroups.com>
Message-ID: <b51e6b3a-3219-4b56-9b36-6494c059c761@y10g2000prc.googlegroups.com>

On May 1, 10:56?am, CTO <debat... at gmail.com> wrote:
> > sys.getsizeof() [a suggested solution] isn't platform-specific.
>
> So, to answer the OP's question, you'd just do something like
>
> def get_totalsize(obj):
> ? ? ? ? total_size = sys.getsizeof(obj)
> ? ? ? ? for value in vars(obj).values():
> ? ? ? ? ? ? ? ? try: total_size += get_total_size(value)
> ? ? ? ? ? ? ? ? except: total_size += sys.getsizeof(value)
> ? ? ? ? return totalSize
>
> def get_current_size(env):
> ? ? ? ? size = 0
> ? ? ? ? for value in env.values():
> ? ? ? ? ? ? ? ? try: size += get_total_size(value)
> ? ? ? ? ? ? ? ? except: pass
> ? ? ? ? return size
>
> get_current_size(vars())
>
> and discount the weight of the interpreter?

Keep in mind, sys.getsizeof(obj) returns only the size of the given
object.  Any referenced objects are not included.  You can get the
latter from gc.get_referents(obj).

/Jean Brouwers

PS) The asizeof(obj) function from this recipe <http://
code.activestate.com/recipes/546530> does size the object plus its
references, recursively.



From cdalten at gmail.com  Fri May  1 16:02:59 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Fri, 1 May 2009 13:02:59 -0700 (PDT)
Subject: Question about the wording in the python documents.
Message-ID: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>

At the following url...

http://docs.python.org/library/urllib2.html

They have the following...

"urllib2.urlopen(url[, data][, timeout])

    Open the URL url, which can be either a string or a Request
object"

I don't get how urllib2.urlopen() can take a Request object. When I do
the following....

[cdalten at localhost ~]$ python
Python 2.4.3 (#1, Oct  1 2006, 18:00:19)
[GCC 4.1.1 20060928 (Red Hat 4.1.1-28)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import urllib2
>>>
>>> url = 'http://www.google.com'
>>> req = urllib2.Request(url)
>>> response = urllib2.urlopen(req)
>>>

req is clearly an instance of urllib2.Request and not a Request object.


From lenglish5 at cox.net  Fri May  1 16:10:26 2009
From: lenglish5 at cox.net (Lawson English)
Date: Fri, 01 May 2009 13:10:26 -0700
Subject: [ANN] Python testing client for Second Life virtual world
In-Reply-To: <20090428122837.24697.1129485049.divmod.quotient.12755@henry.divmod.com>
References: <20090428122837.24697.1129485049.divmod.quotient.12755@henry.divmod.com>
Message-ID: <49FB5732.8030807@cox.net>

If anyone is curious, I'm working on a GUI shell for the python second 
life client, pyogp.

Temp home for pyogp intro: 
https://wiki.secondlife.com/wiki/Pyogp/Client_Lib
Basically the [first] plan is to have a GUI wrapper around the sample 
code with a batch file option, and to allow multiple avatar execution 
and control in the same process. It's been tested in the command line 
with up to 20 avatars at once, and the goal is to handle 200 at least, 
for QA purposes, so the GUI has to handle that as well.

Its a pretty interesting project, IMHO. Gives complete source for 
non-graphical aspects of interface with the Second Life virtual world. 
Apache V2 licensed.


Lawson


From rpmuller at gmail.com  Fri May  1 16:54:02 2009
From: rpmuller at gmail.com (Rick Muller)
Date: Fri, 1 May 2009 13:54:02 -0700 (PDT)
Subject: Profiling gives very different predictions of best algorithm
Message-ID: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>

I'm the main programmer for the PyQuante package, a quantum chemistry
package in Python. I'm trying to speed up one of my rate determining
steps. Essentially, I have to decide between two algorithms:

1. Packed means that I compute N**4/8 integrals, and then do a bunch
of indexing operations to unpack;
2. Unpacked means that I compute all N**4 integrals, but don't have to
do any indexing.

Raw timing the two options show that packed is clearly faster (12.5
sec vs 20.6 sec). However, the profilings show very different results.
I have the results below. Clearly I'm going to use the packed scheme.
My question to the mailing list is what am I doing wrong with my
profiling that it shows such poor predictions? I rely on profiling a
great deal to tune my algorithms, and I'm used to seeing differences,
but nothing close to this magnitude.

Here is packed:
 ncalls  tottime  percall  cumtime  percall filename:lineno(function)
 11021725   84.493    0.000   84.493    0.000 :0(ijkl2intindex)
       18   62.064    3.448  119.865    6.659 Ints.py:150(getK)
       18   32.063    1.781   61.186    3.399 Ints.py:131(getJ)
    52975    9.404    0.000   19.658    0.000 CGBF.py:189(coulomb)
   313643    2.542    0.000    2.542    0.000 :0(range)
    52975    2.260    0.000    2.260    0.000 :0(contr_coulomb)
   218200    1.377    0.000    1.377    0.000 CGBF.py:51(norm)
   211900    1.337    0.000    1.337    0.000 CGBF.py:53(powers)
   211900    1.336    0.000    1.336    0.000 CGBF.py:56(exps)
   211900    1.329    0.000    1.329    0.000 CGBF.py:58(pnorms)
   211900    1.328    0.000    1.328    0.000 CGBF.py:52(origin)
   211900    1.328    0.000    1.328    0.000 CGBF.py:57(coefs)
        1    0.979    0.979   21.108   21.108 Ints.py:112(get2ints)
    11790    0.197    0.000    0.197    0.000 :0(dot)
    11828    0.166    0.000    0.166    0.000 :0(zeros)

Here is unpacked:
ncalls  tottime  percall  cumtime  percall filename:lineno(function)
       18   16.158    0.898   17.544    0.975 Ints.py:167(getK)
    52975    9.301    0.000   19.515    0.000 CGBF.py:189(coulomb)
       18    4.584    0.255    5.904    0.328 Ints.py:146(getJ)
   313643    2.630    0.000    2.630    0.000 :0(range)
    52975    2.254    0.000    2.254    0.000 :0(contr_coulomb)
   218200    1.375    0.000    1.375    0.000 CGBF.py:51(norm)
   211900    1.330    0.000    1.330    0.000 CGBF.py:58(pnorms)
   211900    1.325    0.000    1.325    0.000 CGBF.py:53(powers)
   211900    1.325    0.000    1.325    0.000 CGBF.py:57(coefs)
   211900    1.323    0.000    1.323    0.000 CGBF.py:56(exps)
   211900    1.321    0.000    1.321    0.000 CGBF.py:52(origin)
        1    0.782    0.782   20.373   20.373 Ints.py:114(get2ints)
     1875    0.156    0.000    0.384    0.000 CGBF.py:106(nuclear)
    11790    0.147    0.000    0.147    0.000 :0(dot)
    17856    0.112    0.000    0.112    0.000 PGBF.py:63(coef)


From Brian.Mingus at colorado.edu  Fri May  1 16:57:27 2009
From: Brian.Mingus at colorado.edu (Brian)
Date: Fri, 1 May 2009 14:57:27 -0600
Subject: Profiling gives very different predictions of best algorithm
In-Reply-To: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
References: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
Message-ID: <9839a05c0905011357h3b604bf3k12e630e76717df34@mail.gmail.com>

quantum chemistry sounds complicated. that means any advice i can give you
makes me a genius! just kidding. i've heard through the grapevine that
reentrant functions mess up profilers.

On Fri, May 1, 2009 at 2:54 PM, Rick Muller <rpmuller at gmail.com> wrote:

> I'm the main programmer for the PyQuante package, a quantum chemistry
> package in Python. I'm trying to speed up one of my rate determining
> steps. Essentially, I have to decide between two algorithms:
>
> 1. Packed means that I compute N**4/8 integrals, and then do a bunch
> of indexing operations to unpack;
> 2. Unpacked means that I compute all N**4 integrals, but don't have to
> do any indexing.
>
> Raw timing the two options show that packed is clearly faster (12.5
> sec vs 20.6 sec). However, the profilings show very different results.
> I have the results below. Clearly I'm going to use the packed scheme.
> My question to the mailing list is what am I doing wrong with my
> profiling that it shows such poor predictions? I rely on profiling a
> great deal to tune my algorithms, and I'm used to seeing differences,
> but nothing close to this magnitude.
>
> Here is packed:
>  ncalls  tottime  percall  cumtime  percall filename:lineno(function)
>  11021725   84.493    0.000   84.493    0.000 :0(ijkl2intindex)
>       18   62.064    3.448  119.865    6.659 Ints.py:150(getK)
>       18   32.063    1.781   61.186    3.399 Ints.py:131(getJ)
>    52975    9.404    0.000   19.658    0.000 CGBF.py:189(coulomb)
>   313643    2.542    0.000    2.542    0.000 :0(range)
>    52975    2.260    0.000    2.260    0.000 :0(contr_coulomb)
>   218200    1.377    0.000    1.377    0.000 CGBF.py:51(norm)
>   211900    1.337    0.000    1.337    0.000 CGBF.py:53(powers)
>   211900    1.336    0.000    1.336    0.000 CGBF.py:56(exps)
>   211900    1.329    0.000    1.329    0.000 CGBF.py:58(pnorms)
>   211900    1.328    0.000    1.328    0.000 CGBF.py:52(origin)
>   211900    1.328    0.000    1.328    0.000 CGBF.py:57(coefs)
>        1    0.979    0.979   21.108   21.108 Ints.py:112(get2ints)
>    11790    0.197    0.000    0.197    0.000 :0(dot)
>    11828    0.166    0.000    0.166    0.000 :0(zeros)
>
> Here is unpacked:
> ncalls  tottime  percall  cumtime  percall filename:lineno(function)
>       18   16.158    0.898   17.544    0.975 Ints.py:167(getK)
>    52975    9.301    0.000   19.515    0.000 CGBF.py:189(coulomb)
>       18    4.584    0.255    5.904    0.328 Ints.py:146(getJ)
>   313643    2.630    0.000    2.630    0.000 :0(range)
>    52975    2.254    0.000    2.254    0.000 :0(contr_coulomb)
>   218200    1.375    0.000    1.375    0.000 CGBF.py:51(norm)
>   211900    1.330    0.000    1.330    0.000 CGBF.py:58(pnorms)
>   211900    1.325    0.000    1.325    0.000 CGBF.py:53(powers)
>   211900    1.325    0.000    1.325    0.000 CGBF.py:57(coefs)
>   211900    1.323    0.000    1.323    0.000 CGBF.py:56(exps)
>   211900    1.321    0.000    1.321    0.000 CGBF.py:52(origin)
>        1    0.782    0.782   20.373   20.373 Ints.py:114(get2ints)
>     1875    0.156    0.000    0.384    0.000 CGBF.py:106(nuclear)
>    11790    0.147    0.000    0.147    0.000 :0(dot)
>    17856    0.112    0.000    0.112    0.000 PGBF.py:63(coef)
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From emile at fenx.com  Fri May  1 17:06:23 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 01 May 2009 14:06:23 -0700
Subject: Question about the wording in the python documents.
In-Reply-To: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
References: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
Message-ID: <gtfo5j$u7c$1@ger.gmane.org>

On 5/1/2009 1:02 PM grocery_stocker said...
> At the following url...
> 
> http://docs.python.org/library/urllib2.html
> 
> They have the following...
> 
> "urllib2.urlopen(url[, data][, timeout])
> 
>     Open the URL url, which can be either a string or a Request
> object"
> 
> I don't get how urllib2.urlopen() can take a Request object. When I do
> the following....
> 
> [cdalten at localhost ~]$ python
> Python 2.4.3 (#1, Oct  1 2006, 18:00:19)
> [GCC 4.1.1 20060928 (Red Hat 4.1.1-28)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import urllib2
>>>>
>>>> url = 'http://www.google.com'
>>>> req = urllib2.Request(url)
>>>> response = urllib2.urlopen(req)
>>>>
> 
> req is clearly an instance of urllib2.Request and not a Request object.

Yes -- it seems both the 'Request Object' and 'Request Instance' terms 
are used.

If you feel it's a bug you can report this at http://bugs.python.org, 
but I'm not sure what else an object would be if not an instance of a 
class...

Emile
-----

 >>> help (urllib2)
Help on module urllib2:

NAME
     urllib2 - An extensible library for opening URLs
     using a variety of protocols

FILE
     c:\python24\lib\urllib2.py

DESCRIPTION
     The simplest way to use this module is to call the
     urlopen function, which accepts a string containing
     a URL or a Request object (described below).
---------------^^^^^^^^^^^^^^

<snip 2 paragraphs>

     urlopen(url, data=None) -- basic usage is that same
     as original urllib.  pass the url and optionally data
     to post to an HTTP URL, and get a file-like object
     back.  One difference is that you can also pass a
     Request instance instead of URL.
----^^^^^^^^^^^^^^^^




From castironpi at gmail.com  Fri May  1 17:18:05 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 1 May 2009 14:18:05 -0700 (PDT)
Subject: subprocess & shared environments
References: <8c79f749-e648-4a2e-afad-4053a8ec5cbd@f41g2000pra.googlegroups.com>
Message-ID: <98aa4906-5006-437a-8fc0-0eaedf433be9@3g2000yqk.googlegroups.com>

On May 1, 12:09?am, Robert Dailey <rcdai... at gmail.com> wrote:
> I'm currently calling subprocess.call() on a batch file (in Windows)
> that sets a few environment variables that are needed by further
> processes started via subprocess.call(). How can I persist the
> environment modifications by the first call() function? I've done my
> own searching on this and I came up with nothing.
>
> Help is appreciated.

I don't know if this will work, but you can try spawning a batch file
that calls the first program to set the variables, then executes the
second program.  You might need to create that batch file by hand, as
well as the command line for the second process.

You can also try setting the env. variables in the parent process, and
restoring them after.


From kyosohma at gmail.com  Fri May  1 17:21:26 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 1 May 2009 14:21:26 -0700 (PDT)
Subject: wxPython having trouble with frame objects
References: <mailman.4886.1241142872.11746.python-list@python.org> 
	<5ddd5a7f-8c2b-4f39-a89e-376a3d646caf@t36g2000prt.googlegroups.com> 
	<f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com> 
	<49FA8024.3060608@ieee.org>
	<mailman.4893.1241154771.11746.python-list@python.org>
Message-ID: <7a695810-56b6-428e-98cb-2205407eb5c6@g19g2000yql.googlegroups.com>

On May 1, 12:12?am, Soumen banerjee <soume... at gmail.com> wrote:
> Hello,
> Im not adding any GUI elements from the changer thread. Im just
> attempting to change the value of a preexisting widget made in thread
> one. The point is that i need to display text generated in thread 2 in
> a GUI generated in thread 1.
> As far as inter thread synchronization is concerned, i see your point.
> So i took this approach
>
> import wx,gui,threading
> fix=0
> i=1
> class guithread(threading.Thread):
> ? ? def run(self):
> ? ? ? ? global fix
> ? ? ? ? app = wx.PySimpleApp(0)
> ? ? ? ? wx.InitAllImageHandlers()
> ? ? ? ? guithread.frame_1 = gui.MyFrame(None, -1, "")
> ? ? ? ? app.SetTopWindow(guithread.frame_1)
> ? ? ? ? guithread.frame_1.Show()
> ? ? ? ? print "setting fix"
> ? ? ? ? fix=1
> ? ? ? ? app.MainLoop()
> gui1=guithread()
> gui1.start()
> class changer(threading.Thread):
> ? ? def run(self):
> ? ? ? ? print fix
> ? ? ? ? gui1.frame_1.text_ctrl_1.SetValue("hello")
> print fix
> while i:
> ? ? if fix == 1:
> ? ? ? ? print "starting changer"
> ? ? ? ? chang=changer()
> ? ? ? ? chang.start()
> ? ? ? ? i=0
> This works, but is there anything simpler?
> Regards
> Soumen

For additional ideas on using threads in wxPython, see the wiki:

http://wiki.wxpython.org/LongRunningTasks

- Mike


From darwin at nowhere.com  Fri May  1 17:23:58 2009
From: darwin at nowhere.com (Paul Hemans)
Date: Sat, 2 May 2009 07:23:58 +1000
Subject: What do you think of ShowMeDo
References: <b6671f88-bc04-42eb-aad1-5b212bcab1ef@z23g2000prd.googlegroups.com>
	<87tz48s7hm.fsf@benfinney.id.au>
	<52d28fba-ebf7-4bfb-b568-64304da650d5@w31g2000prd.googlegroups.com>
	<pan.2009.04.29.06.27.10@REMOVE.THIS.cybersource.com.au>
	<17bacf12-037f-4dda-8ee3-1b51d83ac654@z23g2000prd.googlegroups.com>
	<gtd6l3$1ph4$1@news.ett.com.ua>
	<760gejF1af7reU1@mid.individual.net>
Message-ID: <gtfp9l$irp$1@news.ett.com.ua>

I was fishing for a response, by posting multiple replies
Inadvertantly, I have offended one of the Python rabbis
For this misdemeanor I am most contrite
But I still got a fish to bite.

"Peter Pearson" <ppearson at nowhere.invalid> wrote in message 
news:760gejF1af7reU1 at mid.individual.net...
> On Fri, 1 May 2009 07:53:35 +1000, Paul Hemans <darwin at nowhere.com> wrote:
> [snip]
>> them as they have been recorded in the anals of the web, however I
> .........................................^^^^^
>
> That's the second time in this thread.  The first might have been
> deliberate gross wordplay, but now it's time for somebody to point
> out that maybe this word doesn't mean what you think it means.
>
> -- 
> To email me, substitute nowhere->spamcop, invalid->net. 




From kyosohma at gmail.com  Fri May  1 17:24:41 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 1 May 2009 14:24:41 -0700 (PDT)
Subject: wxPython having trouble with frame objects
References: <mailman.4886.1241142872.11746.python-list@python.org> 
	<5ddd5a7f-8c2b-4f39-a89e-376a3d646caf@t36g2000prt.googlegroups.com> 
	<f6a09c160904302057x73bce75dgc9590120adf71b@mail.gmail.com> 
	<mailman.4892.1241153586.11746.python-list@python.org>
Message-ID: <38f911cf-654e-4b7e-ba73-2cb63f18c424@q16g2000yqg.googlegroups.com>

On Apr 30, 11:52?pm, Dave Angel <da... at ieee.org> wrote:
> Soumen banerjee wrote:
> > Hello,
> > you say that ?frame_1 is an attribute of the main class. The main
> > class here is guithread right? so any instance of guithread should
> > also have an attribute called frame_1 isnt it? Excuse me if im getting
> > this wrong, since i am somewhat new to python.
> > Regards
> > Soumen
>
> > On Fri, May 1, 2009 at 9:05 AM, CM <cmpyt... at gmail.com> wrote:
>
> >> On Apr 30, 9:54 pm, Soumen banerjee <soume... at gmail.com> wrote:
>
> >>> Hello,
> >>> I am using wxglade to design a gui which i am using in another script.
> >>> Here are the codes
>
> >>> The main file:
> >>> import wx,gui,threading
> >>> class guithread(threading.Thread):
> >>> ? ?def run(self):
> >>> ? ? ? ?app =x.PySimpleApp(0)
> >>> ? ? ? ?wx.InitAllImageHandlers()
> >>> ? ? ? ?self.frame_1 =ui.MyFrame(None, -1, "")
> >>> ? ? ? ?app.SetTopWindow(self.frame_1)
> >>> ? ? ? ?self.frame_1.Show()
> >>> ? ? ? ?app.MainLoop()
> >>> gui1=ithread()
> >>> gui1.start()
> >>> class changer(threading.Thread):
> >>> ? ?def run(self):
> >>> ? ? ? ?gui1.frame_1.text_ctrl_1.Setvalue("hello")
> >>> chang=anger()
> >>> chang.start()
>
> >>> and The GUI file (gui.py, imported in the above)
> >>> import wx
>
> >>> # begin wxGlade: extracode
> >>> # end wxGlade
>
> >>> class MyFrame(wx.Frame):
> >>> ? ?def __init__(self, *args, **kwds):
> >>> ? ? ? ?# begin wxGlade: MyFrame.__init__
> >>> ? ? ? ?kwds["style"] =x.DEFAULT_FRAME_STYLE
> >>> ? ? ? ?wx.Frame.__init__(self, *args, **kwds)
> >>> ? ? ? ?self.text_ctrl_1 =x.TextCtrl(self, -1, "")
> >>> ? ? ? ?self.slider_1 =x.Slider(self, -1, 0, 0, 10)
> >>> ? ? ? ?self.Open =x.Button(self, -1, "Open")
> >>> ? ? ? ?self.button_4 =x.Button(self, -1, "Pause/Resume")
> >>> ? ? ? ?self.button_5 =x.Button(self, -1, "Quit")
>
> >>> ? ? ? ?self.__set_properties()
> >>> ? ? ? ?self.__do_layout()
>
> >>> ? ? ? ?self.Bind(wx.EVT_COMMAND_SCROLL, self.slider, self.slider_1)
> >>> ? ? ? ?self.Bind(wx.EVT_BUTTON, self.open, self.Open)
> >>> ? ? ? ?self.Bind(wx.EVT_BUTTON, self.pause, self.button_4)
> >>> ? ? ? ?self.Bind(wx.EVT_BUTTON, self.quit, self.button_5)
> >>> ? ? ? ?# end wxGlade
>
> >>> ? ?def __set_properties(self):
> >>> ? ? ? ?# begin wxGlade: MyFrame.__set_properties
> >>> ? ? ? ?self.SetTitle("frame_1")
> >>> ? ? ? ?self.SetSize((522, 457))
> >>> ? ? ? ?# end wxGlade
>
> >>> ? ?def __do_layout(self):
> >>> ? ? ? ?# begin wxGlade: MyFrame.__do_layout
> >>> ? ? ? ?sizer_1 =x.BoxSizer(wx.VERTICAL)
> >>> ? ? ? ?sizer_2 =x.BoxSizer(wx.VERTICAL)
> >>> ? ? ? ?sizer_3 =x.BoxSizer(wx.HORIZONTAL)
> >>> ? ? ? ?sizer_2.Add(self.text_ctrl_1, 7, wx.EXPAND, 0)
> >>> ? ? ? ?sizer_2.Add(self.slider_1, 0, wx.EXPAND, 0)
> >>> ? ? ? ?sizer_3.Add(self.Open, 0, wx.LEFT, 70)
> >>> ? ? ? ?sizer_3.Add((52, 20), 0, 0, 0)
> >>> ? ? ? ?sizer_3.Add(self.button_4, 0, wx.ALIGN_CENTER_HORIZONTAL, 0)
> >>> ? ? ? ?sizer_3.Add((55, 23), 0, 0, 0)
> >>> ? ? ? ?sizer_3.Add(self.button_5, 0, 0, 0)
> >>> ? ? ? ?sizer_2.Add(sizer_3, 1, wx.EXPAND, 0)
> >>> ? ? ? ?sizer_1.Add(sizer_2, 1, wx.EXPAND, 0)
> >>> ? ? ? ?self.SetSizer(sizer_1)
> >>> ? ? ? ?self.Layout()
> >>> ? ? ? ?# end wxGlade
>
> >>> ? ?def slider(self, event): # wxGlade: MyFrame.<event_handler>
> >>> ? ? ? ?print "Event handler `slider' not implemented!"
> >>> ? ? ? ?event.Skip()
>
> >>> ? ?def open(self, event): # wxGlade: MyFrame.<event_handler>
> >>> ? ? ? ?print "Event handler `open' not implemented!"
> >>> ? ? ? ?event.Skip()
>
> >>> ? ?def pause(self, event): # wxGlade: MyFrame.<event_handler>
> >>> ? ? ? ?print "Event handler `pause' not implemented!"
> >>> ? ? ? ?event.Skip()
>
> >>> ? ?def quit(self, event): # wxGlade: MyFrame.<event_handler>
> >>> ? ? ? ?print "Event handler `quit' not implemented!"
> >>> ? ? ? ?event.Skip()
>
> >>> # end of class MyFrame
>
> >>> if __name__ ="__main__":
> >>> ? ?app =x.PySimpleApp(0)
> >>> ? ?wx.InitAllImageHandlers()
> >>> ? ?frame_1 =yFrame(None, -1, "")
> >>> ? ?app.SetTopWindow(frame_1)
> >>> ? ?frame_1.Show()
> >>> ? ?app.MainLoop()
>
> >>> The problem here is that when i run the main file, i am told that
> >>> 'guithread' object has no attribute 'frame_1' whereas i seem to have
> >>> defined
> >>> self.frame_1=i.MyFrame etc.
>
> >> Your statement above means that self--that is, the instance of
> >> your main class--has an attribute called frame_1, and that name
> >> refers to an instance of the MyFrame class from the gui module.
>
> >> It does not mean that the guithread object has an attribute named
> >> frame_1. ?In order to do that, you should have written:
>
> >> guithread.frame_1 =omething
>
> >>> The idea here is to access a gui element running in a thread from a
> >>> separate thread. Please help
>
> >> I would post wxPython related questions on the wxPython mailing
> >> list, which is excellent.
> >>http://www.wxpython.org/maillist.php
>
> >> HTH,
> >> Che
> >> --
> >>http://mail.python.org/mailman/listinfo/python-list
>
> Don't top-post. It puts things entirely out of order. Now the order of
> the parts of this message are 3, 1, 2, 4
>
> Two things at least are wrong here, either of which is fatal.
> ? ?1) you have two threads doing GUI stuff. ?Can't be done, at least not in wxPython. ?Certain things can be done in a second thread, but definitely not constructing Frames and such.


You are correct...but I think that's pretty common across GUI
toolkits. The GUI has it's own main loop that will get blocked if
another thread tries to do something or you'll end up with strange
behavior. As far as I know, each toolkit has its own methods for
working around this. In wxPython's case, you can use wx.CallAfter,
wx.CallLater and several others to manipulate the GUI from a thread.

There's some other ways of going about this on the wxPython wiki:
http://wiki.wxpython.org/LongRunningTasks

- Mike



From seanm.py at gmail.com  Fri May  1 17:34:03 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Fri, 1 May 2009 14:34:03 -0700 (PDT)
Subject: Help! Can't get program to run.
Message-ID: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>

I think this is maybe the most basic problem possible, but I can't get
even the most basic Python to run on OS X using Terminal or IDLE. I
used the IDLE editor to create a file with one line of code

print 'text string'

and I saved the file as module1.py. When using terminal I entered
"python" to load the interpreter or whatever and then tried

python module1.py

but I got an error message. I've tried using the file path instead of
module1.py and that didn't work either. I've tried moving the file to
different places, my desktop, hard drive, etc., and none of that
worked either. In IDLE I tried similar things and only got error
messages there too.

Needless to say this is a frustrating start to learning this langauge.
I'd really appreciate any help getting this to work, so I can move on
the actual language. Thanks so much.


From tjreedy at udel.edu  Fri May  1 17:37:48 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 01 May 2009 17:37:48 -0400
Subject: Passing a function as an argument from within the same class?
In-Reply-To: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
References: <c9b5280a-8626-4817-b3da-a77b0a643dfd@b6g2000pre.googlegroups.com>
Message-ID: <gtfq3c$46q$1@ger.gmane.org>

zealalot wrote:
> So, I'm trying to come up with a way to pass a method (from the same
> class) as the default argument for another method in the same class.
> Unfortunately though, I keep getting "self not defined" errors since
> the class hasn't been read completely before it references itself.
> 
> Is there a better way of doing this?
> 
> --- CODE ---
> 
> class SomeClass():
>     def doNothing(self):
>         pass
>     def function1(self):
>         print "Running function 1."
>     def function2(self, passedFunction=self.doNothing):
>         print "Running passed function."
>         passedFunction()
> 
> someObject = SomeClass()
> someObject.function2(someobject.function1)

As Stephen D'Aprano indicated, this is very easy

class SomeClass():
     def doNothing(self):
         print("Doing nothing")
     def function1(self):
         print ("Running function 1.")
     def function2(self, passedFunction=doNothing):
         print ("Running passed function.")
         passedFunction(self)

someObject = SomeClass()
someObject.function2()
someObject.function2(SomeClass.function1)

produces (with 3.0.1)

Running passed function.
Doing nothing
Running passed function.
Running function 1.

Key 1: a class statement introduces a new local namespace.  The body of 
the class statement is executed in that namespace.  Default arguments 
are evaluated, when a def statement is executed, in the local namespace 
of that def statement.  For methods, that is the local namespace of the 
class.  Hence, 'passedFunction = doNothing' works fine.

Key 2: When a parameter is a function, the signature of the default and 
passed args are effectively part of the required type for the args.  In 
this case, passedFunction is a function with one parameter.  When 
captured, doNothing is not yet a method of the yet-to-become Someclass. 
So non-defaults passed to .function2 do not have to be methods either. 
In Python 3, unbound methods are simply functions anyway.

Terry Jan Reedy



From tjreedy at udel.edu  Fri May  1 17:42:47 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 01 May 2009 17:42:47 -0400
Subject: Importing modules
In-Reply-To: <49FB2F13.4040906@hughes.net>
References: <b6671f88-bc04-42eb-aad1-5b212bcab1ef@z23g2000prd.googlegroups.com>	<87tz48s7hm.fsf@benfinney.id.au>	<52d28fba-ebf7-4bfb-b568-64304da650d5@w31g2000prd.googlegroups.com>	<pan.2009.04.29.06.27.10@REMOVE.THIS.cybersource.com.au>	<17bacf12-037f-4dda-8ee3-1b51d83ac654@z23g2000prd.googlegroups.com>	<4eb0089f0904291713m3859c90yd0298a740967b149@mail.gmail.com>	<b1d973a70904291801q39854313ic4ca35863580a52a@mail.gmail.com>	<mailman.4818.1241065035.11746.python-list@python.org>	<a4d6108f-13d5-4adb-8bcc-c9772ea3af1f@d19g2000prh.googlegroups.com>	<49f9e0f8$0$7893$9a6e19ea@unlimited.newshosting.com>	<op.us77a7bsx6zn5v@lepton.softlabbsas.com.ar>
	<49FB2F13.4040906@hughes.net>
Message-ID: <gtfqcn$4uc$1@ger.gmane.org>

norseman wrote:

> OH - something you mentioned that didn't seem to be addressed.
> import - load a complete library
> from   - obtain specific 'function'(s) from a library

from can also be used to get a specific module from a package

If you 'import pack.mod', then you have to write 'pack.mod.ob' to access 
anything within mod.  But if you do 'from pack import mod', then just 
'mod.ob' works.



From deets at nospam.web.de  Fri May  1 17:45:23 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 01 May 2009 23:45:23 +0200
Subject: Help! Can't get program to run.
In-Reply-To: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
Message-ID: <7618rjF1a3t8jU1@mid.uni-berlin.de>

seanm.py at gmail.com schrieb:
> I think this is maybe the most basic problem possible, but I can't get
> even the most basic Python to run on OS X using Terminal or IDLE. I
> used the IDLE editor to create a file with one line of code
> 
> print 'text string'
> 
> and I saved the file as module1.py. When using terminal I entered
> "python" to load the interpreter or whatever and then tried
> 
> python module1.py
> 
> but I got an error message. I've tried using the file path instead of
> module1.py and that didn't work either. I've tried moving the file to
> different places, my desktop, hard drive, etc., and none of that
> worked either. In IDLE I tried similar things and only got error
> messages there too.
> 
> Needless to say this is a frustrating start to learning this langauge.
> I'd really appreciate any help getting this to work, so I can move on
> the actual language. Thanks so much.

It would have helped if you had given us the *actual* error-message.


 From what little information you give, it appears as if you do 
something very basic wrong - instead of doing

$ python
 >>> python mymodule.py

(where $ is the shell/terminal and >>> the python-prompt)

you either do

$ python
 >>> print "hello"

or

$ python mymodule.py

to execute mymodule directly.

Diez


From tjreedy at udel.edu  Fri May  1 17:50:00 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 01 May 2009 17:50:00 -0400
Subject: Profiling gives very different predictions of best algorithm
In-Reply-To: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
References: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
Message-ID: <gtfqq8$4uc$2@ger.gmane.org>

Rick Muller wrote:
> I'm the main programmer for the PyQuante package, a quantum chemistry
> package in Python. I'm trying to speed up one of my rate determining
> steps. Essentially, I have to decide between two algorithms:
> 
> 1. Packed means that I compute N**4/8 integrals, and then do a bunch
> of indexing operations to unpack;
> 2. Unpacked means that I compute all N**4 integrals, but don't have to
> do any indexing.
> 
> Raw timing the two options show that packed is clearly faster (12.5
> sec vs 20.6 sec). However, the profilings show very different results.
> I have the results below. Clearly I'm going to use the packed scheme.
> My question to the mailing list is what am I doing wrong with my
> profiling that it shows such poor predictions? 

That *might* be easier to answer if you were to show exactly what you 
did to get the odd-looking results ;-)



From castironpi at gmail.com  Fri May  1 17:51:04 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 1 May 2009 14:51:04 -0700 (PDT)
Subject: Multiprocessing.Queue - I want to end.
References: <mailman.4864.1241124562.11746.python-list@python.org>
Message-ID: <2759676b-952a-46d0-a766-334782794984@o18g2000yqi.googlegroups.com>

On Apr 30, 3:49?pm, Luis Zarrabeitia <ky... at uh.cu> wrote:
> Hi. I'm building a script that closely follows a producer-consumer model. In
> this case, the producer is disk-bound and the consumer is cpu-bound, so I'm
> using the multiprocessing module (python2.5 with the multiprocessing backport
> from google.code) to speed up the processing (two consumers, one per core,
> and one producer). The consumers are two multiprocessing.Process instances,
> the producer is the main script, and the data is sent using a
> multiprocessing.Queue instance (with bounded capacity).
>
> The problem: when there is no more data to process, how can I signal the
> consumers to consume until the queue is empty and then stop consuming? I need
> them to do some clean-up work after they finish (and then I need the main
> script to summarize the results)
snip
> ? ? for data in iter(queue.get, None):
> ? ? ? ? process_data(data, outfile) # stores the result in the outfile
snip
> ? ? queue.put(None); queue.put(None)
snip
> As you can see, I'm sending one 'None' per consumer, and hoping that no
> consumer will read more than one None. While this particular implementation
> ensures that, it is very fragile. Is there any way to signal the consumers?
> (or better yet, the queue itself, as it is shared by all consumers?)
> Should "close" work for this? (raise the exception when the queue is
> exhausted, not when it is closed by the producer).

You may have to write the consumer loop by hand, rather than using
'for'.  In the same-process case, you can do this.

producer:
sentinel= object( )

consumer:
while True:
  item= queue.get( )
  if item is sentinel:
    break
  etc.

Then, each consumer is guaranteed to consume no more than one
sentinel, and thus producing one sentinel per consumer will halt them
all.

However, with multiple processes, the comparison to 'sentinel' will
fail, since each subprocess gets a copy, not the original, of the
sentinel.  A sample program which sent the same object multiple times
produced this output:

<object object at 0x00B8A388>
<object object at 0x00B8A3A0>

Theoretically, you could send a shared object, which would satisfy the
identity test in the subprocess.  That failed with this exception:

  File "c:\programs\python30\lib\multiprocessing\queues.py", line 51,
in __getstate__
    assert_spawning(self)
...
RuntimeError: Queue objects should only be shared between processes th
rough inheritance

As a result, your options are more complicated.  I think the best
option is to send a tuple with the data.  Instead of sending 'item',
send '( True, item )'.  Then when the producer is finished, send
'( False, <any> )'.  The consumer will break when it encounters a
'False' first value.

An alternative is to spawn a watchman thread in each subprocess, which
merely blocks for a shared Event object, then sets a per-process
variable, then adds a dummy object to the queue.  The dummy is
guaranteed to be added after the last of the data.  Each process is
guaranteed to consume no more than one dummy, so they will all wake
up.

If you don't like those, you could just use a time-out, which checks
the contents of a shared variable, like a one-element array, then
checks the queue to be empty.  If the shared variable is True, and the
queue is empty, there is no more data.

I'm curious how these work and what you decide.


From castironpi at gmail.com  Fri May  1 18:03:30 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 1 May 2009 15:03:30 -0700 (PDT)
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz> <49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au> 
	<gtdtsr$qv1$3@lust.ihug.co.nz>
	<020ab4a3$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <dabe1eec-0848-45fb-bf85-4f7b235900b5@l12g2000yqo.googlegroups.com>

On May 1, 4:30?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Fri, 01 May 2009 16:30:19 +1200, Lawrence D'Oliveiro wrote:
> > I have never written anything so unbelievable in my life. And I hope I
> > never will.
>
> I didn't say you did. If anyone thought I was quoting Lawrence's code,
> I'd be surprised. It was not my intention to put words into your mouth.
>
> But seeing as you have replied, perhaps you could tell us something.
> Given so much you despise using non-bools in truth contexts, how would
> you re-write my example to avoid "a or b or c"?
>
> for x in a or b or c:
> ? ? do_something_with(x)

I think Hendrik's is the closest so far, but still doesn't iterate
over x:

for t in [a,b,c]:
    if t:
        for x in t:
            do_something_with(x)
        break

This is still not right, since Steven's code will raise an exception
if 'a' and 'b' test False, and 'c' is non-iterable.

>>> for x in 0 or 0 or 0:
...     print( x )
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'int' object is not iterable
>>> for x in 0 or 0 or []:
...     print( x )
...
>>> for x in 0 or 0 or 1:
...     print( x )
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'int' object is not iterable
>>> for x in ['abc'] or 0 or 0:
...     print( x )
...
abc

To mimic it exactly, you'd have to actually convert the first one,
execute 'or' on the other two, since they may have side-effects or
return other values than themselves, and try iterating over the last
one.  I think you are looking at an 'ireduce' function, which doesn't
exist in 'itertools' yet.

I don't think it would be very common to write Steven's construction
for arbitrary values of 'a', 'b', and 'c'.


From rschroev_nospam_ml at fastmail.fm  Fri May  1 18:04:45 2009
From: rschroev_nospam_ml at fastmail.fm (Roel Schroeven)
Date: Sat, 02 May 2009 00:04:45 +0200
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <mailman.4899.1241167799.11746.python-list@python.org>
References: <200904301649.10341.kyrie@uh.cu>
	<mailman.4899.1241167799.11746.python-list@python.org>
Message-ID: <2mKKl.16353$B17.1674@newsfe26.ams2>

Hendrik van Rooyen schreef:
> I have always wondered why people do the one queue many getters thing.

Because IMO it's the simplest and most elegant solution.
> 
> Given that the stuff you pass is homogenous in that it will require a
> similar amount of effort to process, is there not a case to be made
> to have as many queues as consumers, and to round robin the work?

Could work if the processing time for each work unit is exactly the same
(otherwise one or more consumers will be idle part of the time), but in
most cases that is not guaranteed. A simple example is fetching data
over the network: even if the data size is always the same, there will
be differences because of network load variations.

If you use one queue, each consumer fetches a new work unit as soon it
has consumed the previous one. All consumers will be working as long as
there is work to do, without having to write any code to do the load
balancing.

With one queue for each consumer, you either have to assume that the
average processing time is the same (otherwise some consumers will be
idle at the end, while others are still busy processing work units), or
you need some clever code in the producer(s) or the driving code to
balance the loads. That's extra complexity for little or no benefit.

I like the simplicity of having one queue: the producer(s) put work
units on the queue with no concern which consumer will process them or
how many consumers there even are; likewise the consumer(s) don't know
and don't need to know where their work units come from. And the work
gets automatically distributed to whichever consumer has first finished
its previous work unit.

> And if the stuff you pass around needs disparate effort to consume,
> it seems to me that you can more easily balance the load by having
> specialised consumers, instead of instances of one humungous 
> "I can eat anything" consumer.

If there is a semantic difference, maybe yes; but I think it makes no
sense to differentiate purely on the expected execution times.

> I also think that having a queue per consumer thread makes it easier
> to replace the threads with processes and the queues with pipes or
> sockets if you need to do serious scaling later.

Perhaps, but isn't that a case of YAGNI and/or premature optimization?


-- 
The saddest aspect of life right now is that science gathers knowledge
faster than society gathers wisdom.
  -- Isaac Asimov

Roel Schroeven


From piet at cs.uu.nl  Fri May  1 18:08:55 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 02 May 2009 00:08:55 +0200
Subject: string processing question
References: <mailman.4855.1241110874.11746.python-list@python.org>
	<3fbff25a-530e-4364-a7e1-3db6255b0d6b@k19g2000prh.googlegroups.com>
	<mailman.4897.1241166798.11746.python-list@python.org>
	<eqAKl.2289$_e5.2089@newsfe21.ams2>
	<mailman.4915.1241186567.11746.python-list@python.org>
Message-ID: <m2skjopjbc.fsf@cs.uu.nl>

>>>>> Kurt Mueller <mu at problemlos.ch> (KM) wrote:

>KM> But from the command line python interprets the code
>KM> as 'latin_1' I presume. That is why I have to convert
>KM> the "?" with unicode().
>KM> Am I right?

There are a couple of stages:
1. Your terminal emulator interprets your keystrokes, encodes them in a
   sequence of bytes and passes them to the shell. How the characters
   are encodes depends on the encoding used in the terminal emulator. So
   for example when the terminal is set to utf-8, your "?" is converted
   to two bytes: \xc3 and \xa4.
2. The shell passes these bytes to the python command. 
3. The python interpreter must interpret these bytes with some decoding.
   If you use them in a bytes string they are copied as such, so in the
   example above the string "?" will consist of the 2 bytes '\xc3\xa4'.
   If your terminal encoding would have been iso-8859-1, the string
   would have had a single byte '\xe4'. If you use it in a unicode
   string the Python parser has to convert it to unicode. If there is an
   encoding declaration in the source than that is used. Of course it
   should be the same as the actual encoding used by the shell (or the
   editor when you have a script saved in a file) otherwise you have a
   problem. If there is no encoding declaration in the source Python has
   to guess. It appears that in Python 2.x the default is iso-8859-1 but
   in Python 3.x it will be utf-8. You should avoid making any
   assumptions about this default.
4. During runtime unicode characters that have to be printed, written to
   a file, passed as file names or arguments to other processes etc.
   have to be encoded again to a sequence of bytes. In this case Python
   refuses to guess. Also you can't use the same encoding as in step 3,
   because the program can run on a completely different system than
   were it was compiled to byte code. So if the (unicode) string isn't
   ASCII and no encoding is given you get an error. The encoding can be
   given explicitely, or depending on the context, by sys.stdout.encoding,
   sys.getdefaultencoding or PYTHONIOENCODING (from 2.6 on). 

Unfortunately there is no equivalent to PYTHONIOENCODING for the
interpretation of the source text, it only works on run-time.

Example:
python -c 'print len(u"?")'
prints 2 on my system, because my terminal is utf-8 so the ? is passed
as 2 bytes (\xc3\xa4), but these are interpreted by Python 2.6.2 as two
iso-8859-1 bytes.

If I do 
python -c 'print u"?"' in my terminal I therefore get two characters: ??
but if I do this in Emacs I get:
UnicodeEncodeError: 'ascii' codec can't encode characters in position
0-1: ordinal not in range(128)
because my Emacs doesn't pass the encoding of its terminal emulation.

However:
python -c '# -*- coding:utf-8 -*-
print len(u"?")'
will correctly print 1.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From nad at acm.org  Fri May  1 18:10:26 2009
From: nad at acm.org (Ned Deily)
Date: Fri, 01 May 2009 15:10:26 -0700
Subject: Help! Can't get program to run.
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
Message-ID: <nad-56E909.15102601052009@ger.gmane.org>

In article <7618rjF1a3t8jU1 at mid.uni-berlin.de>,
 "Diez B. Roggisch" <deets at nospam.web.de> wrote:
> seanm.py at gmail.com schrieb:
> > I think this is maybe the most basic problem possible, but I can't get
> > even the most basic Python to run on OS X using Terminal or IDLE. I
> > used the IDLE editor to create a file with one line of code
> > 
> > print 'text string'
> > 
> > and I saved the file as module1.py. When using terminal I entered
> > "python" to load the interpreter or whatever and then tried
> > 
> > python module1.py
> > 
> > but I got an error message. I've tried using the file path instead of
> > module1.py and that didn't work either. I've tried moving the file to
> > different places, my desktop, hard drive, etc., and none of that
> > worked either. In IDLE I tried similar things and only got error
> > messages there too.
> > 
> > Needless to say this is a frustrating start to learning this langauge.
> > I'd really appreciate any help getting this to work, so I can move on
> > the actual language. Thanks so much.
> 
> It would have helped if you had given us the *actual* error-message.
>  From what little information you give, it appears as if you do 
> something very basic wrong - instead of doing
> $ python
>  >>> python mymodule.py 
> (where $ is the shell/terminal and >>> the python-prompt)
> you either do
> $ python
>  >>> print "hello"
> or
> $ python mymodule.py 
> to execute mymodule directly.

And from within OS X IDLE itself, if you create or open the file 
mymodule.py, it will be in a separate window and, as long as that window 
is selected, you can run the file directly within IDLE by selecting "Run 
Module" from the "Run" menu.   So, no need to use the Terminal if you 
don't want to.

-- 
 Ned Deily,
 nad at acm.org



From castironpi at gmail.com  Fri May  1 18:13:34 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 1 May 2009 15:13:34 -0700 (PDT)
Subject: Multiprocessing Pool and functions with many arguments
References: <880bfeb5-cc71-4ff5-b7a6-ffd6404597f0@v23g2000pro.googlegroups.com>
Message-ID: <678d4c8b-63e0-4b63-8623-bd730b451d35@w40g2000yqd.googlegroups.com>

On Apr 29, 1:01?pm, "psaff... at googlemail.com"
<psaff... at googlemail.com> wrote:
> I'm trying to get to grips with the multiprocessing module, having
> only used ParallelPython before.
>
> based on this example:
>
> http://docs.python.org/library/multiprocessing.html#using-a-pool-of-w...
>
> what happens if I want my "f" to take more than one argument? I want
> to have a list of tuples of arguments and have these correspond the
> arguments in f, but it keeps complaining that I only have one argument
> (the tuple). Do I have to pass in a tuple and break it up inside f? I
> can't use multiple input lists, as I would with regular map.
>
> Thanks,
>
> Peter

The basic constructor should allow it.

http://docs.python.org/library/multiprocessing.html#the-process-class

p = Process(target=f, args=('bob',))

I think you are imagining:

result = pool.apply_async(f, [ *(1,2,3), *(4,5,6) ] )

But I don't know of a way.


From rpmuller at gmail.com  Fri May  1 18:21:11 2009
From: rpmuller at gmail.com (Rick)
Date: Fri, 1 May 2009 15:21:11 -0700 (PDT)
Subject: Profiling gives very different predictions of best algorithm
References: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
	<mailman.4947.1241214614.11746.python-list@python.org>
Message-ID: <a6ec8b96-7374-44f0-918c-2f4940409c60@y34g2000prb.googlegroups.com>

Sorry, I'm running the function:

def debugsuite():
    import profile,pstats
    profile.run('runsuite()','prof')
    prof = pstats.Stats('prof')
    prof.strip_dirs().sort_stats('time').print_stats(15)

where runsuite() runs the Hartree-Fock energy of a water molecule, and
is given by:


import unittest,logging
from PyQuante.CI import CIS
from PyQuante.Molecule import Molecule
from PyQuante.MP import MP2
from PyQuante.OEP import oep_hf,oep_hf_an
from PyQuante.PyQuante2 import SCF,SubspaceSolver,DmatSolver

class UnitTests(unittest.TestCase):
    def setUp(self):
        from PyQuante.Molecule import Molecule
        self.h2o = Molecule('h2o',[(8,(0,0,0)),(1,(1.,0,0)),(1,
(0,1.,0))],
                            units="Angstrom")

    def testH2OHF(self):
        h2o_hf = SCF(self.h2o,method='HF')
        h2o_hf.iterate()
        self.assertAlmostEqual(h2o_hf.energy,-76.011755864850628,4)

def runsuite(verbose=True):
    # To use psyco, uncomment this line:
    #import psyco; psyco.full()
    if verbose: verbosity=2
    else: verbosity=1
    # If you want more output, uncomment this line:
    #logging.basicConfig(format="%(message)s",level=logging.DEBUG)
    suite = unittest.TestLoader().loadTestsFromTestCase(UnitTests)
    unittest.TextTestRunner(verbosity=verbosity).run(suite)
    # Running without verbosity is equivalent to replacing the above
    # two lines with the following:
    #unittest.main()
    return


On May 1, 3:50?pm, Terry Reedy <tjre... at udel.edu> wrote:
> Rick Muller wrote:
> > I'm the main programmer for the PyQuante package, a quantum chemistry
> > package in Python. I'm trying to speed up one of my rate determining
> > steps. Essentially, I have to decide between two algorithms:
>
> > 1. Packed means that I compute N**4/8 integrals, and then do a bunch
> > of indexing operations to unpack;
> > 2. Unpacked means that I compute all N**4 integrals, but don't have to
> > do any indexing.
>
> > Raw timing the two options show that packed is clearly faster (12.5
> > sec vs 20.6 sec). However, the profilings show very different results.
> > I have the results below. Clearly I'm going to use the packed scheme.
> > My question to the mailing list is what am I doing wrong with my
> > profiling that it shows such poor predictions?
>
> That *might* be easier to answer if you were to show exactly what you
> did to get the odd-looking results ;-)



From guenther.dietrich at spamfence.net  Fri May  1 18:28:45 2009
From: guenther.dietrich at spamfence.net (=?UTF-8?Q?G=C3=BCnther?= Dietrich)
Date: Sat, 02 May 2009 00:28:45 +0200
Subject: ctypes: reference of a struct member?
References: <mailman.4935.1241199602.11746.python-list@python.org>
Message-ID: <tl9sc6-5ru.ln1@spamfence.net>

ma <mabdelkader at gmail.com> wrote:

>If I have this struct in C:
>
>struct spam {
>     int ham;
>  char foo;
>};
>
>
>if I have this declaration:
>struct spam s_;
>
>If I wanted to pass a reference to a function of s_'s foo character, I
>can do something like this:
>
>somefunc(&s_.foo)
>
>How do I do the same thing in ctypes?
>ctypes.addressof(s_) + ctypes.sizeof(spam.foo)*(1)

See ctypes.create_string_buffer().
To unpack the struct elements received from the C function, use 
struct.unpack().

Here some example:

    def rssiam_volt_Q(self):
        '''Output Voltage Query
        '''
        query_buffer = ctypes.create_string_buffer(8)
        self.rssiam_32_dll.rssiam_volt_Q.argtypes = [ctypes.c_long,
                                                     ctypes.c_char_p]
        result = self.rssiam_32_dll.rssiam_volt_Q(self.session,
                                                  query_buffer)
        if result != VI_SUCCESS:
            raise IOError, 'rssiam_volt_Q: result = %d' % result
        return(struct.unpack('d', query_buffer.raw)[0])


In this case, it is a 64 bits float (= double) value that is returned by 
reference (query_buffer).
Attention, struct.unpack() returns a tuple, even when there is only a 
single element to extract from the buffer.




Regards,

G?nther


From http  Fri May  1 18:47:49 2009
From: http (Paul Rubin)
Date: 01 May 2009 15:47:49 -0700
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz>
	<49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<gtdtsr$qv1$3@lust.ihug.co.nz>
	<020ab4a3$0$20667$c3e8da3@news.astraweb.com>
	<dabe1eec-0848-45fb-bf85-4f7b235900b5@l12g2000yqo.googlegroups.com>
Message-ID: <7xmy9w1luy.fsf@ruckus.brouhaha.com>

Aaron Brady <castironpi at gmail.com> writes:
> I think you are looking at an 'ireduce' function, which doesn't
> exist in 'itertools' yet.

Nothing is being done with the return value.

  sum(1 for x in imap(func, seq)) 

is enough to force evaluation of func on each element of seq.


From piet at cs.uu.nl  Fri May  1 18:57:09 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 02 May 2009 00:57:09 +0200
Subject: urllib2 and threading
References: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
Message-ID: <m2ocucph2y.fsf@cs.uu.nl>

>>>>> robean <st1999 at gmail.com> (R) wrote:

>R> def get_info_from_url(url):
>R>   """ A dummy version of the function simply visits urls and prints
>R> the url of the page. """
>R>   try:
>R>     page = urllib2.urlopen(url)
>R>   except urllib2.URLError, e:
>R>     print "**** error ****", e.reason
>R>   except urllib2.HTTPError, e:
>R>     print "**** error ****", e.code

There's a problem here. HTTPError is a subclass of URLError so it should
be first. Otherwise when you have an HTTPError (like a 404 File not
found) it will be caught by the "except URLError", but it will not have
a reason attribute, and then you get an exception in the except clause
and the thread will crash.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From malkocb at gmail.com  Fri May  1 19:04:04 2009
From: malkocb at gmail.com (Berkin Malkoc)
Date: Sat, 2 May 2009 02:04:04 +0300
Subject: is it possible to traverse two lists simulatenously using python
In-Reply-To: <c1870d60904292331q2a4b02b9g6747db1f733648ee@mail.gmail.com>
References: <c1870d60904292331q2a4b02b9g6747db1f733648ee@mail.gmail.com>
Message-ID: <3e22924c0905011604v5a8b08dcj464959f12b267988@mail.gmail.com>

You should be looking for "zip"..

On Thu, Apr 30, 2009 at 9:31 AM,  <mobiledreamers at gmail.com> wrote:
> Python
> for i,j in topgirls, richgirls:
>     print i,j
>
> Cheetah
> #for $i,$j in $topgirls, $richgirls
> $i, $j
> #end for
> This doesnt work
>
> --
> Bidegg worlds best auction site
> http://bidegg.com
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From fetchinson at googlemail.com  Fri May  1 19:18:09 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Fri, 1 May 2009 16:18:09 -0700
Subject: is it possible to traverse two lists simulatenously using python
In-Reply-To: <c1870d60904292331q2a4b02b9g6747db1f733648ee@mail.gmail.com>
References: <c1870d60904292331q2a4b02b9g6747db1f733648ee@mail.gmail.com>
Message-ID: <fbe2e2100905011618m5f6319bet76c16892ab9d6f39@mail.gmail.com>

> Python
> for i,j in topgirls, richgirls:
>     print i,j

for i, j in zip( topgirls, richgirls ):
    print i,j

HTH,
Daniel

> Cheetah
> #for $i,$j in $topgirls, $richgirls$i, $j
> #end for
> This doesnt work



-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From mark.seagoe at gmail.com  Fri May  1 19:31:38 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Fri, 1 May 2009 16:31:38 -0700 (PDT)
Subject: web access through vpn client
Message-ID: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>

Hi;

I am trying to retrieve financial data off website for stock market
analysis.  Just hobby not for pay.  I actually am impressed that
urllib2 and BeautifulSoup work pretty well to do what I want, and the
first little routine actually gets the data from the web page...
except if my VPN client is turned on.

I've looked around for a solution but can't find... perhaps I'm not
entering the right search words.  I don't even know where to start.
Can anyone suggest some good reading, or basic idea how to approach?

Thanks,
Mark


From norseman at hughes.net  Fri May  1 19:58:50 2009
From: norseman at hughes.net (norseman)
Date: Fri, 01 May 2009 16:58:50 -0700
Subject: string processing question
In-Reply-To: <m2skjopjbc.fsf@cs.uu.nl>
References: <mailman.4855.1241110874.11746.python-list@python.org>	<3fbff25a-530e-4364-a7e1-3db6255b0d6b@k19g2000prh.googlegroups.com>	<mailman.4897.1241166798.11746.python-list@python.org>	<eqAKl.2289$_e5.2089@newsfe21.ams2>	<mailman.4915.1241186567.11746.python-list@python.org>
	<m2skjopjbc.fsf@cs.uu.nl>
Message-ID: <49FB8CBA.5090803@hughes.net>

Piet van Oostrum wrote:
>>>>>> Kurt Mueller <mu at problemlos.ch> (KM) wrote:
> 
>> KM> But from the command line python interprets the code
>> KM> as 'latin_1' I presume. That is why I have to convert
>> KM> the "?" with unicode().
>> KM> Am I right?
> 
> There are a couple of stages:
> 1. Your terminal emulator interprets your keystrokes, encodes them in a
>    sequence of bytes and passes them to the shell. How the characters
>    are encodes depends on the encoding used in the terminal emulator. So
>    for example when the terminal is set to utf-8, your "?" is converted
>    to two bytes: \xc3 and \xa4.
> 2. The shell passes these bytes to the python command. 
> 3. The python interpreter must interpret these bytes with some decoding.
>    If you use them in a bytes string they are copied as such, so in the
>    example above the string "?" will consist of the 2 bytes '\xc3\xa4'.
>    If your terminal encoding would have been iso-8859-1, the string
>    would have had a single byte '\xe4'. If you use it in a unicode
>    string the Python parser has to convert it to unicode. If there is an
>    encoding declaration in the source than that is used. Of course it
>    should be the same as the actual encoding used by the shell (or the
>    editor when you have a script saved in a file) otherwise you have a
>    problem. If there is no encoding declaration in the source Python has
>    to guess. It appears that in Python 2.x the default is iso-8859-1 but
>    in Python 3.x it will be utf-8. You should avoid making any
>    assumptions about this default.
> 4. During runtime unicode characters that have to be printed, written to
>    a file, passed as file names or arguments to other processes etc.
>    have to be encoded again to a sequence of bytes. In this case Python
>    refuses to guess. Also you can't use the same encoding as in step 3,
>    because the program can run on a completely different system than
>    were it was compiled to byte code. So if the (unicode) string isn't
>    ASCII and no encoding is given you get an error. The encoding can be
>    given explicitely, or depending on the context, by sys.stdout.encoding,
>    sys.getdefaultencoding or PYTHONIOENCODING (from 2.6 on). 
> 
> Unfortunately there is no equivalent to PYTHONIOENCODING for the
> interpretation of the source text, it only works on run-time.
> 
> Example:
> python -c 'print len(u"?")'
> prints 2 on my system, because my terminal is utf-8 so the ? is passed
> as 2 bytes (\xc3\xa4), but these are interpreted by Python 2.6.2 as two
> iso-8859-1 bytes.
> 
> If I do 
> python -c 'print u"?"' in my terminal I therefore get two characters: ??
> but if I do this in Emacs I get:
> UnicodeEncodeError: 'ascii' codec can't encode characters in position
> 0-1: ordinal not in range(128)
> because my Emacs doesn't pass the encoding of its terminal emulation.
> 
> However:
> python -c '# -*- coding:utf-8 -*-
> print len(u"?")'
> will correctly print 1.
===============================

Thank you. I knew there had to be something simpler than brute force.

I have missed seeing the explanations for:
     python -c '# -*- coding:utf-8 -*-
in the 2.5 docs. Where can I find these? (the python -c  is for config, 
I presume?)

By the way - the however: python...\nprint... snippet bombs in 2.5.2
1st bomb:  looking for closing '    #so I add one and remove one below
2nd bomb:  bad syntax               # I play awhile and join EMACS
3rd bomb:   Non-ASCII character '\xe4' in file....no encoding declared..

Python flatly states it's not ASCII and quits. Python print refuses to 
handle high bit set bytes in 2.5.2....

The thank you is for pointing out how it works. I can use sed to fix for 
file listing purposes.  (Python won't like them, but a second pass thru 
sed can give me something python can use and the two names can go on a 
line on the cheat sheet.)

Barry, Kurt - do understand using sed to change the incoming names?
Put the python in a box and use the Linux mc, ls, sed and echo routines 
to get the names into a form python can use while making the cheat sheet 
at the same time.  Substitutions like  a for ?  will generally be 
acceptable. Yes or No?  The cheat sheet can show the ? in the original 
name because the OS functions allow it. I have no doubt there will be 
some exceptions. :(
Once the names are "ASCII" you can get the python out & put it to work.

Just to head off the comments that it's not .... whatever

ls -1 | cheater.scr | python_program.py    IS PURE UNIX

Unix is designed for this. Files from different parts of the world?  If 
you can see the name as something besides ????? make a cheeter for each 
'Page'.    mc /path/to/dir/of/choice
            ls -1 >dummy
            highlight dummy
            F3
            F4    and read the hex
takes me longer to type it in here than to do it. (leading spaces)  :)

Today: 20090430


Steve

ps. Piet - thanks for including the version specifics.  It makes a huge 
difference in expectations and allowances.


From apt.shansen at gmail.com  Fri May  1 20:41:03 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 1 May 2009 17:41:03 -0700
Subject: web access through vpn client
In-Reply-To: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
References: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
Message-ID: <7a9c25c20905011741m6b5d4360yf32acdf99238a685@mail.gmail.com>

>
> I am trying to retrieve financial data off website for stock market
> analysis.  Just hobby not for pay.  I actually am impressed that
> urllib2 and BeautifulSoup work pretty well to do what I want, and the
> first little routine actually gets the data from the web page...
> except if my VPN client is turned on.
>

Usually when something like that happens with a VPN its because the VPN has
been configured to do so. Its the default usually and is a security
precaution.  The exact wording of the option varies from VPN client to VPN
client; and its usually hidden deep in 'advanced'. E.g., on the mac its
"Send all traffic over VPN connection", on Windows I /believe/ its something
like "Set as default gateway" but its been awhile since I had to tweak my
windows install. No idea what it looks like on the Cisco client.

--S
-------------- next part --------------
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From MrJean1 at gmail.com  Fri May  1 20:50:37 2009
From: MrJean1 at gmail.com (Jean)
Date: Fri, 1 May 2009 17:50:37 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<mailman.4898.1241167327.11746.python-list@python.org>
	<7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
	<mailman.4921.1241190260.11746.python-list@python.org>
	<ff9a9718-73a5-45f9-8c29-512cd344ac8b@r37g2000yqn.googlegroups.com>
	<b51e6b3a-3219-4b56-9b36-6494c059c761@y10g2000prc.googlegroups.com>
Message-ID: <75e47cc6-72bc-4941-802e-767f2187445f@d7g2000prl.googlegroups.com>

On May 1, 12:50?pm, Jean <MrJe... at gmail.com> wrote:
> On May 1, 10:56?am, CTO <debat... at gmail.com> wrote:
>
>
>
> > > sys.getsizeof() [a suggested solution] isn't platform-specific.
>
> > So, to answer the OP's question, you'd just do something like
>
> > def get_totalsize(obj):
> > ? ? ? ? total_size = sys.getsizeof(obj)
> > ? ? ? ? for value in vars(obj).values():
> > ? ? ? ? ? ? ? ? try: total_size += get_total_size(value)
> > ? ? ? ? ? ? ? ? except: total_size += sys.getsizeof(value)
> > ? ? ? ? return totalSize
>
> > def get_current_size(env):
> > ? ? ? ? size = 0
> > ? ? ? ? for value in env.values():
> > ? ? ? ? ? ? ? ? try: size += get_total_size(value)
> > ? ? ? ? ? ? ? ? except: pass
> > ? ? ? ? return size
>
> > get_current_size(vars())
>
> > and discount the weight of the interpreter?
>
> Keep in mind, sys.getsizeof(obj) returns only the size of the given
> object. ?Any referenced objects are not included. ?You can get the
> latter from gc.get_referents(obj).
>
> /Jean Brouwers
>
> PS) The asizeof(obj) function from this recipe <http://
> code.activestate.com/recipes/546530> does size the object plus its
> references, recursively.

Correction, the last sentence should be: The asizeof(obj) ... plus its
referents, recursively.


From gert.cuykens at gmail.com  Fri May  1 20:56:24 2009
From: gert.cuykens at gmail.com (gert)
Date: Fri, 1 May 2009 17:56:24 -0700 (PDT)
Subject: eval(WsgiApplication)
Message-ID: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>

I would like to read the following from a text file

from json import loads
from gert.db import Db
def application(environ, response):
    v = loads(environ['wsgi.input'].read(int(environ
['CONTENT_LENGTH'])).decode('utf-8'))
    db = Db()
    db.execute('UPDATE votes SET count=count+1 WHERE vid=?',(v
['vid'],))
    db.execute('SELECT * FROM votes')
    j = '{"rec":'+db.json()+',\n'
    j+= ' "des":'+db.jdes()+'}'
    j = j.encode('utf-8')
    response('200 OK', [('Content-type', 'text/
javascript;charset=utf-8'), ('Content-Length', str(len(j)))])
    return [j]

execute it, and wrap a new function name around it for example

def wrapper(environ, response):
     exec(file)
     return application(environ, response)

How do I do this in python3?


From martin.hellwig at dcuktec.org  Fri May  1 20:57:32 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sat, 02 May 2009 01:57:32 +0100
Subject: web access through vpn client
In-Reply-To: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
References: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
Message-ID: <EuOdnVFd2dThB2bUnZ2dnUVZ8gqdnZ2d@bt.com>

mark.seagoe at gmail.com wrote:
> Hi;
> 
> I am trying to retrieve financial data off website for stock market
> analysis.  Just hobby not for pay.  I actually am impressed that
> urllib2 and BeautifulSoup work pretty well to do what I want, and the
> first little routine actually gets the data from the web page...
> except if my VPN client is turned on.
> 
> I've looked around for a solution but can't find... perhaps I'm not
> entering the right search words.  I don't even know where to start.
> Can anyone suggest some good reading, or basic idea how to approach?
> 
> Thanks,
> Mark

When the VPN client is on, can you actually still browse the 'classical' 
way to the website in question?
I ask this because many cooperate VPN clients have a way of shutting 
down all other access besides to the VPN server (which is very annoying 
but I can see the logic behind it).

If that is the case your VPN network might have a webproxy which needs 
to be configured to continue browsing when connected to the VPN. For 
python you can automate this by checking for access to the proxy and use 
it if it is there.

-- 
MPH
http://blog.dcuktec.com


From tjreedy at udel.edu  Fri May  1 21:29:26 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 01 May 2009 21:29:26 -0400
Subject: is it possible to traverse two lists simulatenously using python
In-Reply-To: <c1870d60904292331q2a4b02b9g6747db1f733648ee__25264.7264780991$1241218583$gmane$org@mail.gmail.com>
References: <c1870d60904292331q2a4b02b9g6747db1f733648ee__25264.7264780991$1241218583$gmane$org@mail.gmail.com>
Message-ID: <gtg7ll$104$1@ger.gmane.org>

mobiledreamers at gmail.com wrote:
> Python
> for i,j in topgirls, richgirls:
>     print i,j

for i,y in zip(a,b): ...



From tjreedy at udel.edu  Fri May  1 21:38:12 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 01 May 2009 21:38:12 -0400
Subject: Profiling gives very different predictions of best algorithm
In-Reply-To: <a6ec8b96-7374-44f0-918c-2f4940409c60@y34g2000prb.googlegroups.com>
References: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>	<mailman.4947.1241214614.11746.python-list@python.org>
	<a6ec8b96-7374-44f0-918c-2f4940409c60@y34g2000prb.googlegroups.com>
Message-ID: <gtg864$25c$1@ger.gmane.org>

Rick wrote:
[Rearrangee to put answer after question.  Unless your name is Guido and 
you are making a short pronouncement that you want to be sure everyone 
sees, please do not toppost]

 >>> My question to the mailing list is what am I doing wrong with my
 >>> profiling that it shows such poor predictions?
[i wrote]
 >> That *might* be easier to answer if you were to show exactly what you
 >> did to get the odd-looking results ;-)

> Sorry, I'm running the function:
> 
> def debugsuite():
>     import profile,pstats
>     profile.run('runsuite()','prof')
>     prof = pstats.Stats('prof')
>     prof.strip_dirs().sort_stats('time').print_stats(15)
> 
> where runsuite() runs the Hartree-Fock energy of a water molecule, and
> is given by:
> 
> 
> import unittest,logging
> from PyQuante.CI import CIS
> from PyQuante.Molecule import Molecule
> from PyQuante.MP import MP2
> from PyQuante.OEP import oep_hf,oep_hf_an
> from PyQuante.PyQuante2 import SCF,SubspaceSolver,DmatSolver

As far as I could see, you only actually use Molecule and SCF

> 
> class UnitTests(unittest.TestCase):
>     def setUp(self):
>         from PyQuante.Molecule import Molecule

and you repeat the Molecule import here.

>         self.h2o = Molecule('h2o',[(8,(0,0,0)),(1,(1.,0,0)),(1,
> (0,1.,0))],
>                             units="Angstrom")
> 
>     def testH2OHF(self):
>         h2o_hf = SCF(self.h2o,method='HF')
>         h2o_hf.iterate()

I presume that this is where the time goes.

>         self.assertAlmostEqual(h2o_hf.energy,-76.011755864850628,4)
> 
> def runsuite(verbose=True):
>     # To use psyco, uncomment this line:
>     #import psyco; psyco.full()
>     if verbose: verbosity=2
>     else: verbosity=1
>     # If you want more output, uncomment this line:
>     #logging.basicConfig(format="%(message)s",level=logging.DEBUG)
>     suite = unittest.TestLoader().loadTestsFromTestCase(UnitTests)
>     unittest.TextTestRunner(verbosity=verbosity).run(suite)
>     # Running without verbosity is equivalent to replacing the above
>     # two lines with the following:
>     #unittest.main()
>     return

I presume in your overall time text, you ran the two versions of the 
algorith 'naked'.  But, for some reason, you are profiling them embedded 
inside a test suite and runner.  It does not seem that this should 
affect relative timing, but I have seen some pretty strange behaviors. 
At best, it will add noise.

Let me expand my question: what did you do differently between the two 
profile runs?

tjr



From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 21:47:32 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 02 May 2009 01:47:32 GMT
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz> <49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<gtdtsr$qv1$3@lust.ihug.co.nz>
	<020ab4a3$0$20667$c3e8da3@news.astraweb.com>
	<dabe1eec-0848-45fb-bf85-4f7b235900b5@l12g2000yqo.googlegroups.com>
Message-ID: <020b99a5$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 15:03:30 -0700, Aaron Brady wrote:

> On May 1, 4:30?am, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> On Fri, 01 May 2009 16:30:19 +1200, Lawrence D'Oliveiro wrote:
>> > I have never written anything so unbelievable in my life. And I hope
>> > I never will.
>>
>> I didn't say you did. If anyone thought I was quoting Lawrence's code,
>> I'd be surprised. It was not my intention to put words into your mouth.
>>
>> But seeing as you have replied, perhaps you could tell us something.
>> Given so much you despise using non-bools in truth contexts, how would
>> you re-write my example to avoid "a or b or c"?
>>
>> for x in a or b or c:
>> ? ? do_something_with(x)

[...]
> I don't think it would be very common to write Steven's construction for
> arbitrary values of 'a', 'b', and 'c'.

I don't care about "arbitrary values" for a, b and c. I don't expect a 
solution that works for (say) a=None, b=5, c=[]. I'm happy to restrict 
the arguments to all be arbitrary sequence-like objects.

I'm even happy for somebody to give a solution with further restrictions, 
like "if I know before hand that all three are lists, then I do blah...". 
But state your restrictions up front.




-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May  1 21:52:27 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 02 May 2009 01:52:27 GMT
Subject: Question about the wording in the python documents.
References: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
Message-ID: <020b9acb$0$20667$c3e8da3@news.astraweb.com>

On Fri, 01 May 2009 13:02:59 -0700, grocery_stocker wrote:

> I don't get how urllib2.urlopen() can take a Request object. When I do
> the following....
> 
> [cdalten at localhost ~]$ python
> Python 2.4.3 (#1, Oct  1 2006, 18:00:19) [GCC 4.1.1 20060928 (Red Hat
> 4.1.1-28)] on linux2 Type "help", "copyright", "credits" or "license"
> for more information.
>>>> import urllib2
>>>>
>>>> url = 'http://www.google.com'
>>>> req = urllib2.Request(url)
>>>> response = urllib2.urlopen(req)
>>>>
>>>>
> req is clearly an instance of urllib2.Request and not a Request object.

It looks like a Request object to me. You create it by calling 
urllib2.Request(url), and it's an object.

I don't understand your objection. Is it that the documentation calls it 
Request instead of urllib2.Request? Or that it calls it an object instead 
of an instance? 

In either case, I think you're picking a nit so small that it isn't 
actually there. All objects are instances (in Python), and all instances 
are objects. And it should be clear from context that Request refers to 
urllib2.Request, and not some mythical built-in Request object. I don't 
believe that needs to be spelled out.


-- 
Steven


From dayscondor at ameritech.net  Fri May  1 22:10:16 2009
From: dayscondor at ameritech.net (watermod)
Date: Sat, 02 May 2009 02:10:16 GMT
Subject: debian apt somehow created python hell! - help
Message-ID: <pan.2009.05.02.02.17.17@ameritech.net>

I was doing one of those auto apt-get gui things with update manager in 
Debian and not watching the error log so I don't know where it started.

It involves only Python stuff.  I don't know Python but apps use it.


The current apt state is that python apps are failing install in:
/usr/sbin/update-python-modules

typical error list looks like:

dpkg: warning - old pre-removal script returned error exit status 1
dpkg - trying script from the new package instead ...
WARNING: python-gtk2-doc.private does not exist.
         Some bytecompiled files may be left behind.
Traceback (most recent call last):
  File "/usr/sbin/update-python-modules", line 437, in <module>
    public_packages[package].install(need_postinstall)
  File "/usr/sbin/update-python-modules", line 232, in __getitem__
    self[name] = SharedFileList (path)
  File "/usr/sbin/update-python-modules", line 146, in __init__
    for line in file(path):
IOError: [Errno 21] Is a directory
dpkg: error processing /var/cache/apt/archives/python-gtk2-
doc_2.14.1-2_all.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
Traceback (most recent call last):
  File "/usr/sbin/update-python-modules", line 437, in <module>
    public_packages[package].install(need_postinstall)
  File "/usr/sbin/update-python-modules", line 232, in __getitem__
    self[name] = SharedFileList (path)
  File "/usr/sbin/update-python-modules", line 146, in __init__
    for line in file(path):
IOError: [Errno 21] Is a directory
dpkg: error while cleaning up:

on and on and on....
The following:

 dpkg -C

gives:
The following packages are in a mess due to serious problems during
installation.  They must be reinstalled for them (and any packages
that depend on them) to function properly:
 python-reportbug     Python modules for interacting with bug tracking 
systems
 lsb-release          Linux Standard Base version reporting utility
 python-ogg           Python interface to the Ogg library
 system-config-lvm    A utility for graphically configuring Logical 
Volumes
 bitpim               utility to communicate with many CDMA phones
 bitpim-lib           architecture-dependent helper files for BitPim
 python-glade2        GTK+ bindings: Glade support
 python-gtk2          Python bindings for the GTK+ widget set
 python-feedparser    Universal Feed Parser for Python
 python-gtk2-doc      Python bindings for the GTK+ widget set - 
documentation
 k3d                  3D modeling and animation system

The following packages have been unpacked but not yet configured.
They must be configured using dpkg --configure or the configure
menu option in dselect for them to work:
 acroread-plugins     Plugins for Adobe Acrobat(R) Reader
 python-roman         module for generating/analyzing Roman numerals
 python-soappy        SOAP Support for Python
 python-glpk          Python bindings to the GNU Linear Programming Kit
 python-dialog        Python module for making simple Text/Console-mode 
user in
 python-biggles       Scientific plotting package for Python
 python-gd            Python module wrapper for libgd
 python-clutter       Open GL based interactive canvas library - Python 
binding
 python-decoratortools version-agnostic decorators support for Python
 python-fpconst       Utilities for handling IEEE 754 floating point 
special va
 acroread-data        data files for acroread
 python-galago-gtk    GTK+ widgets for the Galago presence library 
(Python inte
 python-utmp          python module for working with utmp
 python-debianbts     Python interface to Debian's Bug Tracking System
 python-gobject-dev   Development headers for the GObject Python bindings
 acroread-escript     Adobe EScript Plug-In
 python-dhm           collection of Python utilities / helper
 python-unit          unit test framework for Python
 acpid                Utilities for using ACPI power management
 python-sqlalchemy    SQL toolkit and Object Relational Mapper for Python
 python-gnutls        Python wrapper for the GNUTLS library
 python-xlib          Interface for Python to the X11 Protocol
 acroread             Adobe Acrobat Reader: Portable Document Format file 
viewe
 python-pyinotify     simple Linux inotify Python bindings
 python-facebook      Python wrappers for the Facebook API
 reportbug            reports bugs in the Debian distribution
 python-ll-core       Python modules for colors, make, cron, daemons, 
URLs, tem
 python-beaker        Simple WSGI middleware that uses the Myghty 
Container API
 python-xcbgen        X C Binding - protocol binding generator
 libroot-dev          Header files for ROOT
 python-dcop          DCOP bindings for Python
 python-docutils      utilities for the documentation of Python modules
 libroot-python-dev   Python extension for ROOT - development files
 python-extractor     extracts meta-data from files of arbitrary type 
(Python b
 python-debian        Python modules to work with Debian-related data 
formats
 python-cheetah       text-based template engine and Python code generator
 python-galago        Galago presence library (Python interface)

The following packages are only half configured, probably due to problems
configuring them the first time.  The configuration should be retried 
using
dpkg --configure <package> or the configure menu option in dselect:
 python-support       automated rebuilding support for Python modules


The last one appears to be a key problem....   reconfigure gives the same 
dam error.

Chicken egg problem of some sort...
I can't add or remove anything python with the debian package tools...
Maybe I could install by hand by a tarball if I knew where to stick stuff

I unpacked a tarball to: /usr/src/python-support-1.0.2
but have no idea what to do...  I am not a python guy... c, c++ perl but  
brain dead for this...
/usr/src/python-support-1.0.2# ls -CF
COPYING     debian/  movemodules*    pysupport.py	     README    
update-python-modules*
debhelper/  hold     parseversions*  python-support.private  runtime/  
update-python-modules.8

SO!!!     HELP ...  SUGGESTIONS?





From mark.seagoe at gmail.com  Fri May  1 22:50:58 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Fri, 1 May 2009 19:50:58 -0700 (PDT)
Subject: web access through vpn client
References: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
	<EuOdnVFd2dThB2bUnZ2dnUVZ8gqdnZ2d@bt.com>
Message-ID: <3b82989a-7e54-461a-b18f-dc90d803c0f9@x29g2000prf.googlegroups.com>

On May 1, 5:57?pm, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> mark.sea... at gmail.com wrote:
> > Hi;
>
> > I am trying to retrieve financial data off website for stock market
> > analysis. ?Just hobby not for pay. ?I actually am impressed that
> > urllib2 and BeautifulSoup work pretty well to do what I want, and the
> > first little routine actually gets the data from the web page...
> > except if my VPN client is turned on.
>
> > I've looked around for a solution but can't find... perhaps I'm not
> > entering the right search words. ?I don't even know where to start.
> > Can anyone suggest some good reading, or basic idea how to approach?
>
> > Thanks,
> > Mark
>
> When the VPN client is on, can you actually still browse the 'classical'
> way to the website in question?
> I ask this because many cooperate VPN clients have a way of shutting
> down all other access besides to the VPN server (which is very annoying
> but I can see the logic behind it).
>
> If that is the case your VPN network might have a webproxy which needs
> to be configured to continue browsing when connected to the VPN. For
> python you can automate this by checking for access to the proxy and use
> it if it is there.
>
> --
> MPHhttp://blog.dcuktec.com

Yes when Cisco AnyConnect VPN client is connected, I can browse w/
IE.  I think the packets get encrypted and possibly go to my company's
server and out from there, because then also Outlook connects to my
company, Communicator works, etc.  With VPN off I can browse and
Python can get URL, but no connection through my company's server & no
encryption.

Where can I find out more about how to configure the webproxy, if the
info is handy?  Thanks!

Mark


From gagsl-py2 at yahoo.com.ar  Fri May  1 23:51:29 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 02 May 2009 00:51:29 -0300
Subject: ctypes: reference of a struct member?
References: <148918f0905011039t1a9a8561nf36c6fe4534e3694@mail.gmail.com>
Message-ID: <op.utaab3qnx6zn5v@gabriel.sleipnir-bsas>

En Fri, 01 May 2009 14:39:39 -0300, ma <mabdelkader at gmail.com> escribi?:

> If I have this struct in C:
>
> struct spam {
>      int ham;
>   char foo;
> };
>
>
> if I have this declaration:
> struct spam s_;
>
> If I wanted to pass a reference to a function of s_'s foo character, I
> can do something like this:
>
> somefunc(&s_.foo)
>
> How do I do the same thing in ctypes?
> ctypes.addressof(s_) + ctypes.sizeof(spam.foo)*(1)

slightly less ugly:

ctypes.addressof(s_) + spam.foo.offset

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May  1 23:56:50 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 02 May 2009 00:56:50 -0300
Subject: ctypes: reference of a struct member?
References: <148918f0905011039t1a9a8561nf36c6fe4534e3694@mail.gmail.com>
	<op.utaab3qnx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <op.utaak0hxx6zn5v@gabriel.sleipnir-bsas>

En Sat, 02 May 2009 00:51:29 -0300, Gabriel Genellina  
<gagsl-py2 at yahoo.com.ar> escribi?:
> En Fri, 01 May 2009 14:39:39 -0300, ma <mabdelkader at gmail.com> escribi?:
>
>> If I have this struct in C:
>>
>> struct spam {
>>      int ham;
>>   char foo;
>> };
>>
>>
>> if I have this declaration:
>> struct spam s_;
>>
>> If I wanted to pass a reference to a function of s_'s foo character, I
>> can do something like this:
>>
>> somefunc(&s_.foo)
>>
>> How do I do the same thing in ctypes?
>> ctypes.addressof(s_) + ctypes.sizeof(spam.foo)*(1)
>
> ctypes.addressof(s_) + spam.foo.offset

Another way: ctypes from Python 2.6 lets you say:

byref(s_, spam.foo.offset)

-- 
Gabriel Genellina



From aahz at pythoncraft.com  Sat May  2 00:16:38 2009
From: aahz at pythoncraft.com (Aahz)
Date: 1 May 2009 21:16:38 -0700
Subject: urllib2 and threading
References: <de102095-b858-4d01-bec2-a7b4b7160caa@u39g2000pru.googlegroups.com>
Message-ID: <gtghf6$af2$1@panix3.panix.com>

In article <de102095-b858-4d01-bec2-a7b4b7160caa at u39g2000pru.googlegroups.com>,
robean  <st1999 at gmail.com> wrote:
>
>Here's the problem: the script simply crashes after getting a a couple
>of urls and takes a long time to run (slower that a non-threaded
>version that I wrote and ran). Can anyone figure out what I am doing
>wrong? I am new to both threading and urllib2, so its possible that
>the SNAFU is quite obvious.

For an example, see

http://www.pythoncraft.com/OSCON2001/index.html
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Typing is cheap.  Thinking is expensive."  --Roy Smith


From research at johnohagan.com  Sat May  2 00:22:20 2009
From: research at johnohagan.com (John O'Hagan)
Date: Sat, 2 May 2009 04:22:20 +0000
Subject: object query assigned variable name?
In-Reply-To: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
Message-ID: <200905020422.20895.research@johnohagan.com>

On Fri, 1 May 2009, warpcat wrote:
> I've passed this around some other groups, and I'm being told
> "probably not possible".  But I thought I'd try here as well :)   I
> *did* search first, and found several similar threads, but they
> quickly tangented into other specifics of the language that were a bit
> over my head :)  At any rate, here's a simple example, I'd love to
> know if as shown, is somehow possible:
>
> Given an object:
>
> class Spam(object):
>     def __init__(self):
>         # stuff....
>
> I'd like it to print, when instanced, something like this:
> >>> s = Spam()
>
> I?m assigned to s!

If you just want the names an instance has in a given namespace, you could 
give your class a method like:

class KnowNames(object):
    def get_names(self, namespace):
        id_str = str(hex(id(self))[:-1])
        return [i for i in namespace if id_str in str(namespace[i])]

which will give you a list of names when called on an instance.

But if you try moving that method inside __init__(), it returns an empty list 
because any assignment is not yet in the namespace. 

I can see that it's tantalizing, though, because _somebody_ must know about 
the assignment; after all, we just executed it!

Regards,

John


From research at johnohagan.com  Sat May  2 00:48:47 2009
From: research at johnohagan.com (John O'Hagan)
Date: Sat, 2 May 2009 04:48:47 +0000
Subject: debian apt somehow created python hell! - help
In-Reply-To: <pan.2009.05.02.02.17.17@ameritech.net>
References: <pan.2009.05.02.02.17.17@ameritech.net>
Message-ID: <200905020448.48038.research@johnohagan.com>

On Sat, 2 May 2009, watermod wrote:
> I was doing one of those auto apt-get gui things with update manager in
> Debian and not watching the error log so I don't know where it started.
>
> It involves only Python stuff.  I don't know Python but apps use it.
>
>
> The current apt state is that python apps are failing install in:
> /usr/sbin/update-python-modules
>
> typical error list looks like:
>
[snip Debian package-management errors]

I sympathise, but those errors are typical of a borked Debian upgrade (usually 
best fixed by waiting or downgrading if the problem is in the repository 
itself, else by manually reinstalling the messed-up package if the problem is 
local), not a python problem, so you'll get better answers on, say, 
debian-users. 

John


From ben+python at benfinney.id.au  Sat May  2 01:40:50 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sat, 02 May 2009 15:40:50 +1000
Subject: debian apt somehow created python hell! - help
References: <pan.2009.05.02.02.17.17@ameritech.net>
	<mailman.4962.1241239728.11746.python-list@python.org>
Message-ID: <87r5z8m599.fsf@benfinney.id.au>

John O'Hagan <research at johnohagan.com> writes:

> On Sat, 2 May 2009, watermod wrote:
> > The current apt state is that python apps are failing install in:
> > /usr/sbin/update-python-modules
> >
> [snip Debian package-management errors]
> ? you'll get better answerson, say, debian-users.

John refers to the Debian user discussion forum, a mailing list at
<URL:http://lists.debian.org/debian-user/>.

-- 
 \      ?Compulsory unification of opinion achieves only the unanimity |
  `\        of the graveyard.? ?Justice Roberts in 319 U.S. 624 (1943) |
_o__)                                                                  |
Ben Finney


From krmane at gmail.com  Sat May  2 03:45:22 2009
From: krmane at gmail.com (Krishnakant)
Date: Sat, 02 May 2009 13:15:22 +0530
Subject: problem with money datatype based calculations in python
Message-ID: <1241250322.4669.13.camel@kk-laptop>

hello all,
I am using postgresql as a database server for my db application.

The database is related to accounts and point of sales and many
calculations involve money datatype.

The application logic is totally done in python.  Now the problem is
that there is a situation where we calculate tax on % of the total
amount on the invoice.  The  percentage is in terms of float but the
eventual amount has to be in a money datatype.

The product cost comes in money datatype from postgresql and the tax %
comes in float.  So I would like to know if python supports some thing
similar to money datatype so that I can cast my total amount (in money )
divided by tax% (in float ) so money divided by float should be the
result and that result should be in money datatype.
For example a product x has the cost Rs. 100 which is stored in the
tabel as money type.  and in the tax table for that product the VAT is
5% and this 5% is stored in float datatype.  So after using both these
values the resulting total 105Rs. should be in money type and not float.
I awaite some reply,
Thanks in advice.
happy hacking.
Krishnakant.



From hackingkk at gmail.com  Sat May  2 04:12:58 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Sat, 02 May 2009 13:42:58 +0530
Subject: interesting float to money conversion problem
Message-ID: <1241251978.4669.16.camel@kk-laptop>

hello all,
> > I am using postgresql as a database server for my db application.
> > 
> > The database is related to accounts and point of sales and many
> > calculations involve money datatype.
> > 
> > The application logic is totally done in python.  Now the problem is
> > that there is a situation where we calculate tax on % of the total
> > amount on the invoice.  The  percentage is in terms of float but the
> > eventual amount has to be in a money datatype.
> > 
> > The product cost comes in money datatype from postgresql and the tax %
> > comes in float.  So I would like to know if python supports some thing
> > similar to money datatype so that I can cast my total amount (in money )
> > divided by tax% (in float ) so money divided by float should be the
> > result and that result should be in money datatype.
> > For example a product x has the cost Rs. 100 which is stored in the
> > tabel as money type.  and in the tax table for that product the VAT is
> > 5% and this 5% is stored in float datatype.  So after using both these
> > values the resulting total 105Rs. should be in money type and not float.
> > I awaite some reply,
> > Thanks in advice.
> > happy hacking.
> > Krishnakant.
> > 
> > --
> > http://mail.python.org/mailman/listinfo/python-list



From arnodel at googlemail.com  Sat May  2 04:23:58 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 02 May 2009 09:23:58 +0100
Subject: Why bool( object )?
References: <54cb7f8a-fef4-4bf8-8054-16dc9b5c8830@d2g2000pra.googlegroups.com>
	<gt6kmp$i2g$3@lust.ihug.co.nz>
	<49f85861$0$29010$426a74cc@news.free.fr>
	<4t_Jl.37718$VA5.20343@tornado.fastwebnet.it>
	<pan.2009.04.30.00.29.35@REMOVE.THIS.cybersource.com.au>
	<gtdtsr$qv1$3@lust.ihug.co.nz>
	<020ab4a3$0$20667$c3e8da3@news.astraweb.com>
	<dabe1eec-0848-45fb-bf85-4f7b235900b5@l12g2000yqo.googlegroups.com>
	<020b99a5$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <m2ws8z52w1.fsf@googlemail.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

> On Fri, 01 May 2009 15:03:30 -0700, Aaron Brady wrote:
>
>> On May 1, 4:30?am, Steven D'Aprano <st... at REMOVE-THIS-
>> cybersource.com.au> wrote:
>>> On Fri, 01 May 2009 16:30:19 +1200, Lawrence D'Oliveiro wrote:
>>> > I have never written anything so unbelievable in my life. And I hope
>>> > I never will.
>>>
>>> I didn't say you did. If anyone thought I was quoting Lawrence's code,
>>> I'd be surprised. It was not my intention to put words into your mouth.
>>>
>>> But seeing as you have replied, perhaps you could tell us something.
>>> Given so much you despise using non-bools in truth contexts, how would
>>> you re-write my example to avoid "a or b or c"?
>>>
>>> for x in a or b or c:
>>> ? ? do_something_with(x)
>
> [...]
>> I don't think it would be very common to write Steven's construction for
>> arbitrary values of 'a', 'b', and 'c'.
>
> I don't care about "arbitrary values" for a, b and c. I don't expect a 
> solution that works for (say) a=None, b=5, c=[]. I'm happy to restrict 
> the arguments to all be arbitrary sequence-like objects.
>
> I'm even happy for somebody to give a solution with further restrictions, 
> like "if I know before hand that all three are lists, then I do blah...". 
> But state your restrictions up front.

If a, b, c are names or literals, then I guess you could do this:

for seq in a, b, c:
    if seq: break
for x in seq:
    do_something_with(x)

I have never been in a situation where I needed something like this,
though.
-- 
Arnaud


From arnodel at googlemail.com  Sat May  2 04:25:47 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 02 May 2009 09:25:47 +0100
Subject: eval(WsgiApplication)
References: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
Message-ID: <m2skjn52t0.fsf@googlemail.com>

gert <gert.cuykens at gmail.com> writes:

> I would like to read the following from a text file
>
> from json import loads
> from gert.db import Db
> def application(environ, response):
>     v = loads(environ['wsgi.input'].read(int(environ
> ['CONTENT_LENGTH'])).decode('utf-8'))
>     db = Db()
>     db.execute('UPDATE votes SET count=count+1 WHERE vid=?',(v
> ['vid'],))
>     db.execute('SELECT * FROM votes')
>     j = '{"rec":'+db.json()+',\n'
>     j+= ' "des":'+db.jdes()+'}'
>     j = j.encode('utf-8')
>     response('200 OK', [('Content-type', 'text/
> javascript;charset=utf-8'), ('Content-Length', str(len(j)))])
>     return [j]
>
> execute it, and wrap a new function name around it for example
>
> def wrapper(environ, response):
>      exec(file)
>      return application(environ, response)
>
> How do I do this in python3?

What's wrong with importing it?

-- 
Arnaud


From subhakolkata1234 at gmail.com  Sat May  2 04:26:14 2009
From: subhakolkata1234 at gmail.com (subhakolkata1234 at gmail.com)
Date: Sat, 2 May 2009 01:26:14 -0700 (PDT)
Subject: File handling problem.
Message-ID: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>

Dear Group,

I am using Python2.6 and has created a file where I like to write some
statistical values I am generating. The statistical values are
generating in a nice way, but as I am going to write it, it is not
taking it, the file is opening or closing properly but the values are
not getting stored. It is picking up arbitrary values from the
generated set of values and storing it. Is there any solution for it?

Best Regards,
SBanerjee.


From chambon.pascal at wanadoo.fr  Sat May  2 04:46:28 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Sat, 02 May 2009 10:46:28 +0200
Subject: File handling problem.
In-Reply-To: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>
References: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>
Message-ID: <49FC0864.5080309@wanadoo.fr>

subhakolkata1234 at gmail.com a ?crit :
> Dear Group,
>
> I am using Python2.6 and has created a file where I like to write some
> statistical values I am generating. The statistical values are
> generating in a nice way, but as I am going to write it, it is not
> taking it, the file is opening or closing properly but the values are
> not getting stored. It is picking up arbitrary values from the
> generated set of values and storing it. Is there any solution for it?
>
> Best Regards,
> SBanerjee.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
>   
Hello

Could you post excerpt of your file-handling code ?
It might be a buffering problem (although when the file closes, I think 
buffers get flushed), else it's really weird...

Regards,
pascal



From paul at subsignal.org  Sat May  2 05:06:44 2009
From: paul at subsignal.org (paul)
Date: Sat, 02 May 2009 11:06:44 +0200
Subject: eval(WsgiApplication)
In-Reply-To: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
References: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
Message-ID: <gth2d4$e7o$1@ger.gmane.org>

gert schrieb:
> I would like to read the following from a text file
Hi gert,

I'm puzzled, what is wrong with using wsgi as advertised? Just import 
your code and insert it in the wsgi chain no?

cheers
  Paul

> 
> from json import loads
> from gert.db import Db
> def application(environ, response):
>     v = loads(environ['wsgi.input'].read(int(environ
> ['CONTENT_LENGTH'])).decode('utf-8'))
>     db = Db()
>     db.execute('UPDATE votes SET count=count+1 WHERE vid=?',(v
> ['vid'],))
>     db.execute('SELECT * FROM votes')
>     j = '{"rec":'+db.json()+',\n'
>     j+= ' "des":'+db.jdes()+'}'
>     j = j.encode('utf-8')
>     response('200 OK', [('Content-type', 'text/
> javascript;charset=utf-8'), ('Content-Length', str(len(j)))])
>     return [j]
> 
> execute it, and wrap a new function name around it for example
> 
> def wrapper(environ, response):
>      exec(file)
>      return application(environ, response)
> 
> How do I do this in python3?
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From gert.cuykens at gmail.com  Sat May  2 05:49:20 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 2 May 2009 02:49:20 -0700 (PDT)
Subject: eval(WsgiApplication)
References: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
	<m2skjn52t0.fsf@googlemail.com>
Message-ID: <39057d64-921e-4150-a382-ec1d443a383f@j12g2000vbl.googlegroups.com>

On May 2, 10:25?am, Arnaud Delobelle <arno... at googlemail.com> wrote:
> gert <gert.cuyk... at gmail.com> writes:
> > I would like to read the following from a text file
>
> > from json import loads
> > from gert.db import Db
> > def application(environ, response):
> > ? ? v = loads(environ['wsgi.input'].read(int(environ
> > ['CONTENT_LENGTH'])).decode('utf-8'))
> > ? ? db = Db()
> > ? ? db.execute('UPDATE votes SET count=count+1 WHERE vid=?',(v
> > ['vid'],))
> > ? ? db.execute('SELECT * FROM votes')
> > ? ? j = '{"rec":'+db.json()+',\n'
> > ? ? j+= ' "des":'+db.jdes()+'}'
> > ? ? j = j.encode('utf-8')
> > ? ? response('200 OK', [('Content-type', 'text/
> > javascript;charset=utf-8'), ('Content-Length', str(len(j)))])
> > ? ? return [j]
>
> > execute it, and wrap a new function name around it for example
>
> > def wrapper(environ, response):
> > ? ? ?exec(file)
> > ? ? ?return application(environ, response)
>
> > How do I do this in python3?
>
> What's wrong with importing it?

The problem is that my wsgi files have a wsgi extention for mod_wsgi
use

package
- __init__.py
- session.py
- db.py
- sqlite
- - sql.db
- www
- - test.htm
- - test.css
- - test.js
- - test.wsgi

i would like to make this package work both in mod_wsgi and cherrypy
server
mod_wsgi has a .wsgi handler because it is recommended to rename the
wsgi file with wsgi extensions to avoid double imports
cherrypy server has a dispatcher class



From chambon.pascal at wanadoo.fr  Sat May  2 05:56:28 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Sat, 02 May 2009 11:56:28 +0200
Subject: Warning of missing side effects
In-Reply-To: <towb-59CC0F.11282302052009@news.individual.de>
References: <towb-59CC0F.11282302052009@news.individual.de>
Message-ID: <49FC18CC.4040807@wanadoo.fr>

Tobias Weber a ?crit :
> Hi,
> being new to Python I find remarkable that I don't see any side effects. 
> That's especially true for binding. First, it is a statement, so this 
> won't work:
>
>    if x = q.pop():
>       print x # output only true values
>
> Second, methods in the standard library either return a value OR modify 
> the reciever, so even if assignment was an expression the above wouldn't 
> work.
>
> Only it still wouldn't, because IF is a statement as well. So no ternary:
>
>    x = if True: 5 else: 7;
>
> However there is one bit of magic, functions implicitly return None. So 
> while the following will both run without error, only one actually works:
>
>    x = 'foo'.upper()
>    y = ['f', 'b'].reverse()
>
> Now I mentioned that the mutable types don't have functions that mutate 
> and return something, so I only have to remember that...
>
> But I'm used to exploiting side effect, and sometimes forget this rule 
> in my own classes. IS THERE A WAY to have the following produce a 
> runtime error?
>
>    def f():
>       x = 5
>       # no return
>
>    y = f()
>
> Maybe use strict ;)
>
>   
Hello

Just to note that if "['f', 'b'].reverse()" doesn't return the new 
value, there is a corersponding function : "reversed(mylist)" which does 
it (idem, sorted(list) <-> list.sort())  B-)

Concerning your question on warnings, well I guess that after a little 
time in python, you won't make mistakes on "side effects" anymore ;

But if you want to add checks to your methods, you should see towards 
decorators or metaclasses : they allow you to wrap your methods inside 
other methods, of which the only point couldbe, for example, to check 
what your methods returtn and raise a warning if it returns "None". But 
the problem is, sometimes you WANT them to return None....

If you want to detect methods that don't have explicit "return" 
statements, then you'll have to play with abstract syntax trees it 
seems... much trouble for not much gain.
I guess you'll quickly get the pythonic habits without needing all that ^^

Regards,
pascal



From martin.hellwig at dcuktec.org  Sat May  2 06:01:32 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sat, 02 May 2009 11:01:32 +0100
Subject: web access through vpn client
In-Reply-To: <3b82989a-7e54-461a-b18f-dc90d803c0f9@x29g2000prf.googlegroups.com>
References: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
	<EuOdnVFd2dThB2bUnZ2dnUVZ8gqdnZ2d@bt.com>
	<3b82989a-7e54-461a-b18f-dc90d803c0f9@x29g2000prf.googlegroups.com>
Message-ID: <TvadnXMrGYqZh2HUnZ2dnUVZ8uydnZ2d@bt.com>

mark.seagoe at gmail.com wrote:
> On May 1, 5:57 pm, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
> wrote:
>> mark.sea... at gmail.com wrote:
>>> Hi;
>>> I am trying to retrieve financial data off website for stock market
>>> analysis.  Just hobby not for pay.  I actually am impressed that
>>> urllib2 and BeautifulSoup work pretty well to do what I want, and the
>>> first little routine actually gets the data from the web page...
>>> except if my VPN client is turned on.
>>> I've looked around for a solution but can't find... perhaps I'm not
>>> entering the right search words.  I don't even know where to start.
>>> Can anyone suggest some good reading, or basic idea how to approach?
>>> Thanks,
>>> Mark
>> When the VPN client is on, can you actually still browse the 'classical'
>> way to the website in question?
>> I ask this because many cooperate VPN clients have a way of shutting
>> down all other access besides to the VPN server (which is very annoying
>> but I can see the logic behind it).
>>
>> If that is the case your VPN network might have a webproxy which needs
>> to be configured to continue browsing when connected to the VPN. For
>> python you can automate this by checking for access to the proxy and use
>> it if it is there.
>>
>> --
>> MPHhttp://blog.dcuktec.com
> 
> Yes when Cisco AnyConnect VPN client is connected, I can browse w/
> IE.  I think the packets get encrypted and possibly go to my company's
> server and out from there, because then also Outlook connects to my
> company, Communicator works, etc.  With VPN off I can browse and
> Python can get URL, but no connection through my company's server & no
> encryption.
> 
> Where can I find out more about how to configure the webproxy, if the
> info is handy?  Thanks!
> 
> Mark

Most likely your IE gets automatically configured for using a proxy when 
the VPN is made, just check your IE settings ounce you are connected to 
the VPN particular the Connection / LAN-connection settings.
Or query what is set in the registry at :
'HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet
Settings'

And use the content (if set) as the proxy address in the urllib module.

You might find this module useful for that:
http://docs.python.org/library/_winreg.html

-- 
MPH
http://blog.dcuktec.com


From martin at v.loewis.de  Sat May  2 06:02:55 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 02 May 2009 12:02:55 +0200
Subject: Warning of missing side effects
In-Reply-To: <towb-59CC0F.11282302052009@news.individual.de>
References: <towb-59CC0F.11282302052009@news.individual.de>
Message-ID: <49FC1A4F.6040502@v.loewis.de>

> But I'm used to exploiting side effect, and sometimes forget this rule 
> in my own classes. IS THERE A WAY to have the following produce a 
> runtime error?
> 
>    def f():
>       x = 5
>       # no return
> 
>    y = f()

Typically, this will produce a runtime error fairly quickly,
namely when you *use* the (presumed) return value of f().
You would normally try to perform some computation with y,
or invoke methods on it - and then you see that it is None.

So while it is not possible to get an exception on the
assignment, you will usually get a runtime error sooner
or later (most of the time, sooner).

FWIW, pylint -e reports on your code

E:  5: Assigning to function call which doesn't return

Regards,
Martin


From mail at microcorp.co.za  Sat May  2 06:38:01 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sat, 2 May 2009 12:38:01 +0200
Subject: Multiprocessing.Queue - I want to end.
References: <200904301649.10341.kyrie@uh.cu><mailman.4899.1241167799.11746.python-list@python.org>
	<2mKKl.16353$B17.1674@newsfe26.ams2>
Message-ID: <00a601c9cb12$152d25e0$0d00a8c0@Hendrik>

: "Roel Schroeven" <rschroev_nospam_ml at fastmail.fm> wrote:


> Hendrik van Rooyen schreef:
> > I have always wondered why people do the one queue many getters thing.
> 
> Because IMO it's the simplest and most elegant solution.

That is fair enough...

> > 
> > Given that the stuff you pass is homogenous in that it will require a
> > similar amount of effort to process, is there not a case to be made
> > to have as many queues as consumers, and to round robin the work?
> 
> Could work if the processing time for each work unit is exactly the same
> (otherwise one or more consumers will be idle part of the time), but in
> most cases that is not guaranteed. A simple example is fetching data
> over the network: even if the data size is always the same, there will
> be differences because of network load variations.
> 
> If you use one queue, each consumer fetches a new work unit as soon it
> has consumed the previous one. All consumers will be working as long as
> there is work to do, without having to write any code to do the load
> balancing.
> 
> With one queue for each consumer, you either have to assume that the
> average processing time is the same (otherwise some consumers will be
> idle at the end, while others are still busy processing work units), or
> you need some clever code in the producer(s) or the driving code to
> balance the loads. That's extra complexity for little or no benefit.
> 
> I like the simplicity of having one queue: the producer(s) put work
> units on the queue with no concern which consumer will process them or
> how many consumers there even are; likewise the consumer(s) don't know
> and don't need to know where their work units come from. And the work
> gets automatically distributed to whichever consumer has first finished
> its previous work unit.

This is all true in the case of a job that starts, runs and finishes.
I am not so sure it applies to something that has a long life.

> 
> > And if the stuff you pass around needs disparate effort to consume,
> > it seems to me that you can more easily balance the load by having
> > specialised consumers, instead of instances of one humungous 
> > "I can eat anything" consumer.
> 
> If there is a semantic difference, maybe yes; but I think it makes no
> sense to differentiate purely on the expected execution times.

The idea is basically that you have the code that classifies in one
place only, instead of running in all the instances of the consumer.
Feels better to me, somehow.

> 
> > I also think that having a queue per consumer thread makes it easier
> > to replace the threads with processes and the queues with pipes or
> > sockets if you need to do serious scaling later.
> 
> Perhaps, but isn't that a case of YAGNI and/or premature optimization?

Yes and no:

Yes - You Are Gonna Need It.
and 
No it is never premature to use a decent structure.

:-)

- Hendrik




From basti.wiesner at gmx.net  Sat May  2 07:14:30 2009
From: basti.wiesner at gmx.net (Sebastian Wiesner)
Date: Sat, 02 May 2009 13:14:30 +0200
Subject: Question about the wording in the python documents.
References: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
	<020b9acb$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <gth9um$d9i$1@hoshi.visyn.net>

<Steven D'Aprano>
> I don't understand your objection. Is it that the documentation calls it
> Request instead of urllib2.Request? Or that it calls it an object instead
> of an instance?
I guess the latter ...

> In either case, I think you're picking a nit so small that it isn't
> actually there. All objects are instances (in Python), and all instances
> are objects.
Exactly, so strictly seen, "Request object" could possibly refer to the 
urllib2.Request class itself.  I guess, the OP would prefer the term 
"Request instance", emphasizing, that an instance of the request class has 
to be passed, not he class itself.

-- 
Freedom is always the freedom of dissenters.
                                      (Rosa Luxemburg)



From ldo at geek-central.gen.new_zealand  Sat May  2 07:25:24 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 02 May 2009 23:25:24 +1200
Subject: Question about the wording in the python documents.
References: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
Message-ID: <gthaj4$rqb$1@lust.ihug.co.nz>

In message <cb978535-4092-49ac-8d9f-
a457d5fd61a5 at k19g2000prh.googlegroups.com>, grocery_stocker wrote:

> req is clearly an instance of urllib2.Request and not a Request object.

"Object" is a term commonly used to mean "instance of a class". In Python, 
classes are also objects, but if classes were meant rather than instances, I 
imagine it would say so.



From gdamjan at gmail.com  Sat May  2 08:15:38 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Sat, 02 May 2009 14:15:38 +0200
Subject: eval(WsgiApplication)
References: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
	<m2skjn52t0.fsf@googlemail.com>
	<39057d64-921e-4150-a382-ec1d443a383f@j12g2000vbl.googlegroups.com>
Message-ID: <a4qtc6-poi.ln1@archaeopteryx.softver.org.mk>

>> > How do I do this in python3?
>>
>> What's wrong with importing it?
> 
> The problem is that my wsgi files have a wsgi extention for mod_wsgi
> use
..
> mod_wsgi has a .wsgi handler because it is recommended to rename the
> wsgi file with wsgi extensions to avoid double imports
> cherrypy server has a dispatcher class


You can either use .py extension for the wsgi files OR use a custom 
importer that can import your .wsgi files
http://docs.python.org/library/modules.html



-- 
?????? ( http://softver.org.mk/damjan/ )

Scarlett Johansson: You always see the glass half-empty.
Woody Allen: No. I see the glass half-full, but of poison.



From aleksandar27 at brisiovonet.hr  Sat May  2 08:25:29 2009
From: aleksandar27 at brisiovonet.hr (alejandro)
Date: Sat, 2 May 2009 14:25:29 +0200
Subject: stuck with PyOBEX
References: <gt78o7$i9n$1@ss408.t-com.hr> <75opebF19fc22U1@mid.uni-berlin.de>
	<gt80qd$mbf$1@get-news01.get.basefarm.net>
	<gt8pbj$j3o$1@ss408.t-com.hr>
	<gtatk5$pff$1@get-news01.get.basefarm.net>
Message-ID: <gthe40$87q$1@ss408.t-com.hr>

I am having problems with connect() it says that it doesn't have sendall 
atribute.

Error:

Traceback (most recent call last):
  File "novi_pokusaj.py", line 25, in <module>
    client.connect()
  File "C:\Python25\lib\PyOBEX\client.py", line 356, in connect
    return Client.connect(self, header_list = [headers.Target(uuid)])
  File "C:\Python25\lib\PyOBEX\client.py", line 127, in connect
    response = self._send_headers(request, header_list, max_length)
  File "C:\Python25\lib\PyOBEX\client.py", line 81, in _send_headers
    self.socket.sendall(request.encode())
AttributeError: BluetoothSocket instance has no attribute 'sendall'>>> Exit 
Code: 1


Did you manage to run it under windows? 




From steve at REMOVE-THIS-cybersource.com.au  Sat May  2 09:24:47 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 02 May 2009 13:24:47 GMT
Subject: File handling problem.
References: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>
Message-ID: <020c3d0c$0$20667$c3e8da3@news.astraweb.com>

On Sat, 02 May 2009 01:26:14 -0700, subhakolkata1234 wrote:

> Dear Group,
> 
> I am using Python2.6 and has created a file where I like to write some
> statistical values I am generating. The statistical values are
> generating in a nice way, but as I am going to write it, it is not
> taking it, the file is opening or closing properly but the values are
> not getting stored. It is picking up arbitrary values from the generated
> set of values and storing it. Is there any solution for it?

Yes. Find the bug in your program and fix it.

If you'd like some help finding the bug, you'll need to give us a little 
bit more information. This website might help you:

http://www.catb.org/~esr/faqs/smart-questions.html



-- 
Steven


From dstanek at dstanek.com  Sat May  2 09:28:31 2009
From: dstanek at dstanek.com (David Stanek)
Date: Sat, 2 May 2009 09:28:31 -0400
Subject: object query assigned variable name?
In-Reply-To: <020b1b54$0$20667$c3e8da3@news.astraweb.com>
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
	<020b1b54$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <de32cc030905020628ma340777q5417667a3df610e0@mail.gmail.com>

On Fri, May 1, 2009 at 12:48 PM, Steven D'Aprano
<steve at remove-this-cybersource.com.au> wrote:
> On Fri, 01 May 2009 09:24:10 -0700, warpcat wrote:
>
>> I'd like it to print, when instanced, something like this:
>>
>>>>> s = Spam()
>> I?m assigned to s!
>>
>> But it seems prohibitively hard (based on my web and forum searches) for
>> an object to know what variable name is has been assigned to when
>> created.
>
> Can't be done. Objects don't know what names they are bound to.
>

While objects don't know what they are assigned to, they can be made
to find out. Unless you have a good use case I don't think that you
really want to be doing it.

DecoratorTools allows you to do this. I have code that allows you to
use a a function like:

    class C:
        attr = inject(Customer)

The inject function does know that it is being assigned to attr. There
is tracing/frame introspection black magic involved. So much so that I
have been debating removing that feature.

The code is on Bitbucket[1]. It has a little extra complication
because inject can also be used as a decorator. The key is the
decorate_assignment call in the inject function.

Again I don't think you really want to do this.

[1] http://bitbucket.org/dstanek/snake-guice/src/tip/snakeguice/decorators.py

-- 
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek


From davea at ieee.org  Sat May  2 09:35:50 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 02 May 2009 09:35:50 -0400
Subject: Warning of missing side effects
In-Reply-To: <towb-59CC0F.11282302052009@news.individual.de>
References: <towb-59CC0F.11282302052009@news.individual.de>
Message-ID: <49FC4C36.2000401@ieee.org>

Tobias Weber wrote:
> Hi,
> being new to Python I find remarkable that I don't see any side effects. 
> That's especially true for binding. First, it is a statement, so this 
> won't work:
>
>    if x = q.pop():
>       print x # output only true values
>
> Second, methods in the standard library either return a value OR modify 
> the reciever, so even if assignment was an expression the above wouldn't 
> work.
>
> Only it still wouldn't, because IF is a statement as well. So no ternary:
>
>    x = if True: 5 else: 7;
>
> However there is one bit of magic, functions implicitly return None. So 
> while the following will both run without error, only one actually works:
>
>    x = 'foo'.upper()
>    y = ['f', 'b'].reverse()
>
> Now I mentioned that the mutable types don't have functions that mutate 
> and return something, so I only have to remember that...
>
> But I'm used to exploiting side effect, and sometimes forget this rule 
> in my own classes. IS THERE A WAY to have the following produce a 
> runtime error?
>
>    def f():
>       x = 5
>       # no return
>
>    y = f()
>
> Maybe use strict ;)
>
>   
There's a ternary operator.  Check out the following sequence:

a = 42
b = 12 if a == 42 else 9
print a, b


Then try it again with a different value of a.

As for using = in an ordinary expression, I don't really miss it.  
Python allows multiple assignments in the same statement, but they're 
all to the same object.  For the kinds of things where I would have done 
an assignment inside an if or while (in C++), I usually can use a list 
comprehension or somesuch.




From guenther.dietrich at spamfence.net  Sat May  2 09:43:23 2009
From: guenther.dietrich at spamfence.net (=?UTF-8?Q?G=C3=BCnther?= Dietrich)
Date: Sat, 02 May 2009 15:43:23 +0200
Subject: problem with money datatype based calculations in python
References: <mailman.4963.1241250341.11746.python-list@python.org>
Message-ID: <r8vtc6-vh1.ln1@spamfence.net>

Krishnakant <krmane at gmail.com> wrote:

['money datatype' for database stored values]

What ist the real problem? Do you have problems converting results of 
float calculations to the 'money datatype' before storing them in the 
database, or do you want to avoid the precision issues which come with 
the conversion od non-integer values between binary and decimal?
In the latter case use the Decimal data type from module decimal (comes 
with the python distribution -- it is mentioned in the tutorial).



Regards,

G?nther


From arnodel at googlemail.com  Sat May  2 10:07:23 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 02 May 2009 15:07:23 +0100
Subject: Warning of missing side effects
References: <towb-59CC0F.11282302052009@news.individual.de>
	<mailman.4971.1241271373.11746.python-list@python.org>
Message-ID: <m2ocub4mzo.fsf@googlemail.com>

Dave Angel <davea at ieee.org> writes:

> Python allows multiple assignments in the same statement, but they're
> all to the same object.

Unless they are to different objects:

    a, b = 1, 2

-- 
Arnaud


From anuhacks at gmail.com  Sat May  2 10:08:28 2009
From: anuhacks at gmail.com (anusha k)
Date: Sat, 2 May 2009 19:38:28 +0530
Subject: problem with money datatype based calculations in python
In-Reply-To: <1241250322.4669.13.camel@kk-laptop>
References: <1241250322.4669.13.camel@kk-laptop>
Message-ID: <61f9a5fb0905020708g5e8f5a7exabd38c9eada3e2f2@mail.gmail.com>

Do calculations in postgresql and then call that calculated value from the
python.So no need to calculate in python at all


Njoy the share of Freedom,
Anusha Kadambala
On Sat, May 2, 2009 at 1:15 PM, Krishnakant <krmane at gmail.com> wrote:

> hello all,
> I am using postgresql as a database server for my db application.
>
> The database is related to accounts and point of sales and many
> calculations involve money datatype.
>
> The application logic is totally done in python.  Now the problem is
> that there is a situation where we calculate tax on % of the total
> amount on the invoice.  The  percentage is in terms of float but the
> eventual amount has to be in a money datatype.
>
> The product cost comes in money datatype from postgresql and the tax %
> comes in float.  So I would like to know if python supports some thing
> similar to money datatype so that I can cast my total amount (in money )
> divided by tax% (in float ) so money divided by float should be the
> result and that result should be in money datatype.
> For example a product x has the cost Rs. 100 which is stored in the
> tabel as money type.  and in the tax table for that product the VAT is
> 5% and this 5% is stored in float datatype.  So after using both these
> values the resulting total 105Rs. should be in money type and not float.
> I awaite some reply,
> Thanks in advice.
> happy hacking.
> Krishnakant.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From davea at ieee.org  Sat May  2 10:09:55 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 02 May 2009 10:09:55 -0400
Subject: problem with money datatype based calculations in python
In-Reply-To: <1241250322.4669.13.camel@kk-laptop>
References: <1241250322.4669.13.camel@kk-laptop>
Message-ID: <49FC5433.2070404@ieee.org>

Krishnakant wrote:
> hello all,
> I am using postgresql as a database server for my db application.
>
> The database is related to accounts and point of sales and many
> calculations involve money datatype.
>
> The application logic is totally done in python.  Now the problem is
> that there is a situation where we calculate tax on % of the total
> amount on the invoice.  The  percentage is in terms of float but the
> eventual amount has to be in a money datatype.
>
> The product cost comes in money datatype from postgresql and the tax %
> comes in float.  So I would like to know if python supports some thing
> similar to money datatype so that I can cast my total amount (in money )
> divided by tax% (in float ) so money divided by float should be the
> result and that result should be in money datatype.
> For example a product x has the cost Rs. 100 which is stored in the
> tabel as money type.  and in the tax table for that product the VAT is
> 5% and this 5% is stored in float datatype.  So after using both these
> values the resulting total 105Rs. should be in money type and not float.
> I awaite some reply,
> Thanks in advice.
> happy hacking.
> Krishnakant.
>
>
>   
Tax rate isn't divided, it's multiplied.  But probably that's just a 
typo in your message.

Short answer is use your money class to convert the float into money.  
And then test, to see that's really what you wanted.  Be sure and check 
the edge cases, because float is a binary system, and you can get both 
quantization and rounding problems converting between them.

Is the money you're dealing with decimal-based?  So maybe money values 
are integers plus two more digits of fractional precision?

It's going to be tough for somebody with no access to that "money type" 
to guess what your problem is.  What operations does it currently 
support?  If it supports multiply, then just change the tax rate to be a 
money type.  Unless of course you might have a tax rate of 5.221%   Does 
your money class support accurate conversion to class decimal?  In that 
case, convert to decimal, multiply, then convert back.

Or if money is really a fixed-point class, with assumed two digits, 
multiply the cost by 100 and convert to int.  Multiply by the tax, and 
convert back.

You also need to specify the government rules for the multiply.  Is 
rounding permitted, or must all fractions of a penny (assumption there) 
be rounded up?

Or switch everything to "class decimal" in the standard python library,  
You still have most of the questions to answer, but at least you'd be 
asking on the right forum.




From pxrepreza at gmail.com  Sat May  2 10:40:40 2009
From: pxrepreza at gmail.com (Paulo Repreza)
Date: Sat, 2 May 2009 07:40:40 -0700
Subject: debian apt somehow created python hell! - help
In-Reply-To: <pan.2009.05.02.02.17.17@ameritech.net>
References: <pan.2009.05.02.02.17.17@ameritech.net>
Message-ID: <d61936e00905020740k6f544cb9tfe357801d2bf9005@mail.gmail.com>

Hi,

Try this.
# aptitude update
# aptitude update
# aptitude upgrade you can also use # aptitude safe-upgrade

Hope it helps.

Paulo Repreza

On May 1, 2009 7:20 PM, "watermod" <dayscondor at ameritech.net> wrote:

I was doing one of those auto apt-get gui things with update manager in
Debian and not watching the error log so I don't know where it started.

It involves only Python stuff.  I don't know Python but apps use it.


The current apt state is that python apps are failing install in:
/usr/sbin/update-python-modules

typical error list looks like:

dpkg: warning - old pre-removal script returned error exit status 1
dpkg - trying script from the new package instead ...
WARNING: python-gtk2-doc.private does not exist.
        Some bytecompiled files may be left behind.
Traceback (most recent call last):
 File "/usr/sbin/update-python-modules", line 437, in <module>
   public_packages[package].install(need_postinstall)
 File "/usr/sbin/update-python-modules", line 232, in __getitem__
   self[name] = SharedFileList (path)
 File "/usr/sbin/update-python-modules", line 146, in __init__
   for line in file(path):
IOError: [Errno 21] Is a directory
dpkg: error processing /var/cache/apt/archives/python-gtk2-
doc_2.14.1-2_all.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
Traceback (most recent call last):
 File "/usr/sbin/update-python-modules", line 437, in <module>
   public_packages[package].install(need_postinstall)
 File "/usr/sbin/update-python-modules", line 232, in __getitem__
   self[name] = SharedFileList (path)
 File "/usr/sbin/update-python-modules", line 146, in __init__
   for line in file(path):
IOError: [Errno 21] Is a directory
dpkg: error while cleaning up:

on and on and on....
The following:

 dpkg -C

gives:
The following packages are in a mess due to serious problems during
installation.  They must be reinstalled for them (and any packages
that depend on them) to function properly:
 python-reportbug     Python modules for interacting with bug tracking
systems
 lsb-release          Linux Standard Base version reporting utility
 python-ogg           Python interface to the Ogg library
 system-config-lvm    A utility for graphically configuring Logical
Volumes
 bitpim               utility to communicate with many CDMA phones
 bitpim-lib           architecture-dependent helper files for BitPim
 python-glade2        GTK+ bindings: Glade support
 python-gtk2          Python bindings for the GTK+ widget set
 python-feedparser    Universal Feed Parser for Python
 python-gtk2-doc      Python bindings for the GTK+ widget set -
documentation
 k3d                  3D modeling and animation system

The following packages have been unpacked but not yet configured.
They must be configured using dpkg --configure or the configure
menu option in dselect for them to work:
 acroread-plugins     Plugins for Adobe Acrobat(R) Reader
 python-roman         module for generating/analyzing Roman numerals
 python-soappy        SOAP Support for Python
 python-glpk          Python bindings to the GNU Linear Programming Kit
 python-dialog        Python module for making simple Text/Console-mode
user in
 python-biggles       Scientific plotting package for Python
 python-gd            Python module wrapper for libgd
 python-clutter       Open GL based interactive canvas library - Python
binding
 python-decoratortools version-agnostic decorators support for Python
 python-fpconst       Utilities for handling IEEE 754 floating point
special va
 acroread-data        data files for acroread
 python-galago-gtk    GTK+ widgets for the Galago presence library
(Python inte
 python-utmp          python module for working with utmp
 python-debianbts     Python interface to Debian's Bug Tracking System
 python-gobject-dev   Development headers for the GObject Python bindings
 acroread-escript     Adobe EScript Plug-In
 python-dhm           collection of Python utilities / helper
 python-unit          unit test framework for Python
 acpid                Utilities for using ACPI power management
 python-sqlalchemy    SQL toolkit and Object Relational Mapper for Python
 python-gnutls        Python wrapper for the GNUTLS library
 python-xlib          Interface for Python to the X11 Protocol
 acroread             Adobe Acrobat Reader: Portable Document Format file
viewe
 python-pyinotify     simple Linux inotify Python bindings
 python-facebook      Python wrappers for the Facebook API
 reportbug            reports bugs in the Debian distribution
 python-ll-core       Python modules for colors, make, cron, daemons,
URLs, tem
 python-beaker        Simple WSGI middleware that uses the Myghty
Container API
 python-xcbgen        X C Binding - protocol binding generator
 libroot-dev          Header files for ROOT
 python-dcop          DCOP bindings for Python
 python-docutils      utilities for the documentation of Python modules
 libroot-python-dev   Python extension for ROOT - development files
 python-extractor     extracts meta-data from files of arbitrary type
(Python b
 python-debian        Python modules to work with Debian-related data
formats
 python-cheetah       text-based template engine and Python code generator
 python-galago        Galago presence library (Python interface)

The following packages are only half configured, probably due to problems
configuring them the first time.  The configuration should be retried
using
dpkg --configure <package> or the configure menu option in dselect:
 python-support       automated rebuilding support for Python modules


The last one appears to be a key problem....   reconfigure gives the same
dam error.

Chicken egg problem of some sort...
I can't add or remove anything python with the debian package tools...
Maybe I could install by hand by a tarball if I knew where to stick stuff

I unpacked a tarball to: /usr/src/python-support-1.0.2
but have no idea what to do...  I am not a python guy... c, c++ perl but
brain dead for this...
/usr/src/python-support-1.0.2# ls -CF
COPYING     debian/  movemodules*    pysupport.py            README
update-python-modules*
debhelper/  hold     parseversions*  python-support.private  runtime/
update-python-modules.8

SO!!!     HELP ...  SUGGESTIONS?



--
http://mail.python.org/mailman/listinfo/python-list
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From david at boddie.org.uk  Sat May  2 10:41:26 2009
From: david at boddie.org.uk (David Boddie)
Date: Sat, 02 May 2009 16:41:26 +0200
Subject: stuck with PyOBEX
References: <gt78o7$i9n$1@ss408.t-com.hr> <75opebF19fc22U1@mid.uni-berlin.de>
	<gt80qd$mbf$1@get-news01.get.basefarm.net>
	<gt8pbj$j3o$1@ss408.t-com.hr>
	<gtatk5$pff$1@get-news01.get.basefarm.net>
	<gthe40$87q$1@ss408.t-com.hr>
Message-ID: <gthm2m$sdr$1@get-news01.get.basefarm.net>

On Saturday 02 May 2009 14:25, alejandro wrote:

> I am having problems with connect() it says that it doesn't have sendall
> atribute.
> 
> Error:
> 
> Traceback (most recent call last):
>   File "novi_pokusaj.py", line 25, in <module>
>     client.connect()
>   File "C:\Python25\lib\PyOBEX\client.py", line 356, in connect
>     return Client.connect(self, header_list = [headers.Target(uuid)])
>   File "C:\Python25\lib\PyOBEX\client.py", line 127, in connect
>     response = self._send_headers(request, header_list, max_length)
>   File "C:\Python25\lib\PyOBEX\client.py", line 81, in _send_headers
>     self.socket.sendall(request.encode())
> AttributeError: BluetoothSocket instance has no attribute 'sendall'>>>
> Exit Code: 1
> 
> Did you manage to run it under windows?

I haven't tried to run it under Windows. I just assumed that BluetoothSocket
would have the same API on both Linux and Windows.

Looking around, it seems that this is something we can work around:

http://svn.navi.cx/misc/trunk/laserprop/client/BluetoothConduit.py

I'll send you an updated version to try if you would like to test it.

David


From rpmuller at gmail.com  Sat May  2 11:10:22 2009
From: rpmuller at gmail.com (Rick)
Date: Sat, 2 May 2009 08:10:22 -0700 (PDT)
Subject: Profiling gives very different predictions of best algorithm
References: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
	<mailman.4947.1241214614.11746.python-list@python.org>
	<a6ec8b96-7374-44f0-918c-2f4940409c60@y34g2000prb.googlegroups.com>
	<mailman.4958.1241228310.11746.python-list@python.org>
Message-ID: <74e32884-95b2-4e1d-9d3d-21f300bd8715@k19g2000prh.googlegroups.com>

On May 1, 7:38?pm, Terry Reedy <tjre... at udel.edu> wrote:

> I presume in your overall time text, you ran the two versions of the
> algorith 'naked'. ?But, for some reason, you are profiling them embedded
> inside a test suite and runner. ?It does not seem that this should
> affect relative timing, but I have seen some pretty strange behaviors.
> At best, it will add noise.
>
> Let me expand my question: what did you do differently between the two
> profile runs?

When I compute the electron repulsion integrals, the two different
methods are:

                        if packed:
                            ijkl = intindex(i,j,k,l)
                            Ints[ijkl] = coulomb(bfs[i],bfs[j],bfs
[k],bfs[l])
                        else:
                            val = coulomb(bfs[i],bfs[j],bfs[k],bfs[l])
                            Ints[i,j,k,l] = val
                            Ints[j,i,k,l] = val
                            Ints[i,j,l,k] = val
                            Ints[j,i,l,k] = val
                            Ints[k,l,i,j] = val
                            Ints[k,l,j,i] = val
                            Ints[l,k,i,j] = val
                            Ints[l,k,j,i] = val

and when I access the integrals the differences are:

                    if packed:
                        index = intindex(i,j,k,l)
                        temp[kl] = Ints[index]
                    else:
                        temp[kl] = Ints[i,j,k,l]

If you look at the profiling, I'm making something like 11M calls to
intindex, which is a routine I've written in C. I thought that by
storing all N**4 integrals (rather than the N**4/8 that packed stores)
would remove the need for the intindex calls and speed things up, but
it's 50% slower. I can't really figure out why it's slower, though,
since profiling makes it look like the slower version is faster.
Something like 30% of the time for the full PyQuante test suite is
taken up with calls to intindex, and I'd like to remove this if
possible.

I also wrote a version of the code where I stored all of the intindex
values in a Python dictionary rather than calling a C function. That
version appeared to be roughly the same speed when I profiled the
code, although I didn't test it without profiling (stupidly) because
at that point I didn't recognize the magnitude of the discrepancy
between the profiling/nonprofiling timings.

I was posting to the list mostly because I would like to know whether
I can do something different when I profile my code so that it give
results that correspond more closely to those that the nonprofiling
results give.



From ebonak at hotmail.com  Sat May  2 11:12:30 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 02 May 2009 11:12:30 -0400
Subject: for with decimal values?
Message-ID: <gthnsv$uil$1@ger.gmane.org>

Hello all,

Is there a Python construct to allow me to do something like
this:

    for i in range(-10.5, 10.5, 0.1):
      ...

If there is such a thing already available, I'd like
to use it, otherwise I can write a function to mimic this,
but I thought I'd check (my search yielded nothing).

Thanks,
Esmail



From aahz at pythoncraft.com  Sat May  2 11:17:27 2009
From: aahz at pythoncraft.com (Aahz)
Date: 2 May 2009 08:17:27 -0700
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
Message-ID: <gtho67$2qa$1@panix3.panix.com>

In article <mailman.4975.1241277173.11746.python-list at python.org>,
Esmail  <ebonak at hotmail.com> wrote:
>
>Is there a Python construct to allow me to do something like this:
>
>    for i in range(-10.5, 10.5, 0.1):
>      ...
>
>If there is such a thing already available, I'd like
>to use it, otherwise I can write a function to mimic this,
>but I thought I'd check (my search yielded nothing).

Write a function
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Typing is cheap.  Thinking is expensive."  --Roy Smith


From cdalten at gmail.com  Sat May  2 11:30:25 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sat, 2 May 2009 08:30:25 -0700 (PDT)
Subject: Question about the wording in the python documents.
References: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
	<020b9acb$0$20667$c3e8da3@news.astraweb.com>
	<gth9um$d9i$1@hoshi.visyn.net>
Message-ID: <4a751872-d92b-4b66-826e-f58a4c33bf16@v1g2000prd.googlegroups.com>

On May 2, 4:14 am, Sebastian Wiesner <basti.wies... at gmx.net> wrote:
> <Steven D'Aprano>> I don't understand your objection. Is it that the documentation calls it
> > Request instead of urllib2.Request? Or that it calls it an object instead
> > of an instance?
>
> I guess the latter ...
>
> > In either case, I think you're picking a nit so small that it isn't
> > actually there. All objects are instances (in Python), and all instances
> > are objects.
>
> Exactly, so strictly seen, "Request object" could possibly refer to the
> urllib2.Request class itself.  I guess, the OP would prefer the term
> "Request instance", emphasizing, that an instance of the request class has
> to be passed, not he class itself.
>

Yes, I personally think that the term "Request instance" would have
made it much clearer to us people that have never taken a computer
science class in our lives.


From davea at ieee.org  Sat May  2 11:32:02 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 02 May 2009 11:32:02 -0400
Subject: Warning of missing side effects
In-Reply-To: <m2ocub4mzo.fsf@googlemail.com>
References: <towb-59CC0F.11282302052009@news.individual.de>	<mailman.4971.1241271373.11746.python-list@python.org>
	<m2ocub4mzo.fsf@googlemail.com>
Message-ID: <49FC6772.8050700@ieee.org>

Arnaud Delobelle wrote:
> Dave Angel <davea at ieee.org> writes:
>
>   
>> Python allows multiple assignments in the same statement, but they're
>> all to the same object.
>>     
>
> Unless they are to different objects:
>
>     a, b = 1, 2
>
>   
You're right, of course.  I was referring to the multiple '=' form, and 
my statement was too general to be correct.

a = b = 42       is legal
a = (b=42) + 1      is not



From chambon.pascal at wanadoo.fr  Sat May  2 11:50:42 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Sat, 02 May 2009 17:50:42 +0200
Subject: for with decimal values?
In-Reply-To: <gtho67$2qa$1@panix3.panix.com>
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<gtho67$2qa$1@panix3.panix.com>
Message-ID: <49FC6BD2.8030304@wanadoo.fr>

Aahz a ?crit :
> In article <mailman.4975.1241277173.11746.python-list at python.org>,
> Esmail  <ebonak at hotmail.com> wrote:
>   
>> Is there a Python construct to allow me to do something like this:
>>
>>    for i in range(-10.5, 10.5, 0.1):
>>      ...
>>
>> If there is such a thing already available, I'd like
>> to use it, otherwise I can write a function to mimic this,
>> but I thought I'd check (my search yielded nothing).
>>     
>
> Write a function
>   
Else you can work on integers - for i in range (-105, 105) - and divide 
by ten just below... but concerning performances I don't know if it's a 
good idea ^^

Regards,
Pascal
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From darcy at druid.net  Sat May  2 11:57:34 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sat, 2 May 2009 11:57:34 -0400
Subject: problem with money datatype based calculations in python
In-Reply-To: <r8vtc6-vh1.ln1@spamfence.net>
References: <mailman.4963.1241250341.11746.python-list@python.org>
	<r8vtc6-vh1.ln1@spamfence.net>
Message-ID: <20090502115734.b280bf35.darcy@druid.net>

On Sat, 02 May 2009 15:43:23 +0200
"G?nther Dietrich" <guenther.dietrich at spamfence.net> wrote:
> Krishnakant <krmane at gmail.com> wrote:
> 
> ['money datatype' for database stored values]
> 
> What ist the real problem? Do you have problems converting results of 
> float calculations to the 'money datatype' before storing them in the 
> database, or do you want to avoid the precision issues which come with 
> the conversion od non-integer values between binary and decimal?
> In the latter case use the Decimal data type from module decimal (comes 
> with the python distribution -- it is mentioned in the tutorial).

And if you use PyGreSQL (http://www.PyGreSQL.org/) to connect to
the database then the money type is already converted to Decimal.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From ppearson at nowhere.invalid  Sat May  2 12:01:35 2009
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 2 May 2009 16:01:35 GMT
Subject: problem with money datatype based calculations in python
References: <mailman.4963.1241250341.11746.python-list@python.org>
Message-ID: <76392uF1aduopU1@mid.individual.net>

On Sat, 02 May 2009 13:15:22 +0530, Krishnakant <krmane at gmail.com> wrote:
> hello all,
> I am using postgresql as a database server for my db application.
>
> The database is related to accounts and point of sales and many
> calculations involve money datatype.
[snip]

As far as I can tell, Python has no type "money".  Is money
a class defined by some postgresql module you're using?  A
very small amount of specific information (e.g., a five-line
sample program that demonstrates the problem) would greatly
improve your chances of getting useful help.

-- 
To email me, substitute nowhere->spamcop, invalid->net.


From jjkk73 at gmail.com  Sat May  2 12:16:48 2009
From: jjkk73 at gmail.com (jorma kala)
Date: Sat, 2 May 2009 18:16:48 +0200
Subject: Accessing files in a directory which is a shortcut link (Windows)
Message-ID: <bda7ac6d0905020916j645815car9a55b49a1a984445@mail.gmail.com>

Hi,
I'd like to process files in a directory which is in fact a short cut link
to another directory (under windows XP).
If the path to the directory is for instance called c:\test. I have tried
both following code snipets for printing all names of files in the
directory:

++ snippet 1++

     for filename in glob.glob( os.path.join(r'c:\test', '*') ):
         print filename

++ snippet 2++

     for filename in glob.glob( os.path.join(r'c:\test.lnk', '*') ):
         print filename

Neither solution works.
Thanks very much for any help.
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From chambon.pascal at wanadoo.fr  Sat May  2 12:33:15 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Sat, 02 May 2009 18:33:15 +0200
Subject: Daemonic processes in multiprocessing - solved
In-Reply-To: <49F33FBA.1050101@gmail.com>
References: <49F33FBA.1050101@gmail.com>
Message-ID: <49FC75CB.6030802@wanadoo.fr>

Pascal Chambon a ?crit :
>
> Hello everyone
>
>
> I've just read the doc of the (awesome) "multiprocessing" module, and 
> there are some little things I don't understand, concerning daemon 
> processes (see quotes below).
>
> When a python process exits, the page says it attempts to join all its 
> children. Is this just a design choice, or are there constraints 
> behind this ? Because normally, when a parent process exits, its child 
> gets adopted by init, and that can be useful for creating daemons, 
> can't it ?
>
> Concerning daemons processes, precisely, the manual states that they 
> are all terminated when their parent process exits. But isn't it 
> contrary to the concept of dameons, which are supposed to have become 
> independent from their parent ?
>
> And I don't understand how "the initial value (of the "daemonic" 
> attribute) is inherited from the creating process", since "daemonic 
> processes are not allowed to create child processes". Isn't it the 
> same to say that "daemonic" is always false by default, then ?
> And finally, why can't daemonic processes have children ? If these 
> children get "orphaned" when the daemonic process gets terminated (by 
> its parent), they'll simply get adpoted by init, won't they ?
>
> Thanks a lot for helping me get rid of my confusion,
> regards,
> Pascal
>
>
> =========QUOTES==========
> daemon? 
> <http://docs.python.org/library/multiprocessing.html#multiprocessing.Process.daemon>
>
>     The process's daemon flag, a Boolean value. This must be set
>     before start()
>     <http://docs.python.org/library/multiprocessing.html#multiprocessing.Process.start>
>     is called.
>
>     The initial value is inherited from the creating process.
>
>     When a process exits, it attempts to terminate all of its daemonic
>     child processes.
>
>     Note that a daemonic process is not allowed to create child
>     processes. Otherwise a daemonic process would leave its children
>     orphaned if it gets terminated when its parent process exits.
>
>     ----------------------
>
> Similarly, if the child process is non-daemonic then the parent
> process may hang on exit when it tries to join all its non-daemonic children.
> --------------
> Remember also that non-daemonic
> processes will be automatically be joined.
>
>   
> ------------------------------------------------------------------------
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>   
Allright, I guess I hadn't understand much about "daemonic processes" in 
python's multiprocessing module.

So, for those interested, here is a clarification of the concepts, as 
far as I've understood - please poke me if I'm wrong somewhere.

Usually, in Unix, daemon processes are processes which got disconnected from
their parent process and from terminals, and work in the background, often under a
different user identity.
The python multiprocessing module has the concept of "daemon" too, but this
time in reference to the "threading" module, in which dameons are just
threads that wont prevent the application termination, even if they are
still running. Thus, daemonic processes launched through multiprocessing
API are normal processes that will be terminated (and not joined) if 
non-dameonic processes are all over.

Thus, not much in common between "traditionnal" *nix daemon processes, and python multiprocessing daemon processes.

Regards, 
pascal


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From arnodel at googlemail.com  Sat May  2 12:35:16 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 02 May 2009 17:35:16 +0100
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
Message-ID: <m2k54z4g57.fsf@googlemail.com>

Esmail <ebonak at hotmail.com> writes:

> Hello all,
>
> Is there a Python construct to allow me to do something like
> this:
>
>    for i in range(-10.5, 10.5, 0.1):
>      ...
>
> If there is such a thing already available, I'd like
> to use it, otherwise I can write a function to mimic this,
> but I thought I'd check (my search yielded nothing).
>
> Thanks,
> Esmail

In this particular example, you could do this:

    for i in range(-105, 105):
        i = 0.1*i
        ...
In general, you'd have to write your own (generator) function.

-- 
Arnaud


From mail at timgolden.me.uk  Sat May  2 12:35:35 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Sat, 02 May 2009 17:35:35 +0100
Subject: Accessing files in a directory which is a shortcut link (Windows)
In-Reply-To: <bda7ac6d0905020916j645815car9a55b49a1a984445@mail.gmail.com>
References: <bda7ac6d0905020916j645815car9a55b49a1a984445@mail.gmail.com>
Message-ID: <49FC7657.1040104@timgolden.me.uk>

jorma kala wrote:
> Hi,
> I'd like to process files in a directory which is in fact a short cut link
> to another directory (under windows XP).
> If the path to the directory is for instance called c:\test. I have tried
> both following code snipets for printing all names of files in the
> directory:
> 
> ++ snippet 1++
> 
>      for filename in glob.glob( os.path.join(r'c:\test', '*') ):
>          print filename
> 
> ++ snippet 2++
> 
>      for filename in glob.glob( os.path.join(r'c:\test.lnk', '*') ):
>          print filename


Windows shortcuts are Shell (ie GUI Desktop) objects rather
than filesystem objects. The filesystem doesn't treat them
specially; just returns the .lnk file (or whatever it's
called). You need to invoke the Shell functionality specifically.

<code>
import os, sys
import glob
import pythoncom
from win32com.shell import shell, shellcon

def shortcut_target (filename):
  shell_link = pythoncom.CoCreateInstance (
    shell.CLSID_ShellLink, 
    None,
    pythoncom.CLSCTX_INPROC_SERVER, 
    shell.IID_IShellLink
  )
  ipersist = shell_link.QueryInterface (pythoncom.IID_IPersistFile)
  ipersist.Load (filename)
  name, _ = shell_link.GetPath (1)
  return name

def shell_glob (pattern):
  for filename in glob.glob (pattern):
    if filename.endswith (".lnk"):
      yield "%s => %s" % (filename, shortcut_target (filename))
    else:
      yield filename

for filename in shell_glob ("c:/temp/*"):
  print filename

</code>

TJG


From dickinsm at gmail.com  Sat May  2 12:45:47 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 2 May 2009 09:45:47 -0700 (PDT)
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
Message-ID: <7832d72d-8e17-4662-8f24-4252c6783f46@x6g2000vbg.googlegroups.com>

On May 2, 4:12?pm, Esmail <ebo... at hotmail.com> wrote:
> Is there a Python construct to allow me to do something like
> this:
>
> ? ? for i in range(-10.5, 10.5, 0.1):
> ? ? ? ...

I'd recommend using integer arithmetic:

for ten_times_i in range(-105, 106):
    i = ten_times_i / 10.0
    ...

This has the advantage that it's clear that
you want to include the endpoint 10.5. (*Did*
you want to include the endpoint?)

Presumably you'd want the float version
to be interpreted as:

i = -10.5
while i < 10.5:
    ...
    i += 0.1

(which isn't *quite* right, because the
value of i that you end up with *after* the
while loop has run to completion is 0.1
more than the last value used within the
loop).

The big problem with this is that 0.1
is not exactly representable as a float, and
so the successive additions in the
assignment i += 0.1 are subject to
(small) rounding errors.  As a result, it's
not clear whether the value of i for the last
loop is going to be 10.4+small_error or
10.5-small_error.

Mark


From mail at timgolden.me.uk  Sat May  2 12:46:56 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Sat, 02 May 2009 17:46:56 +0100
Subject: Accessing files in a directory which is a shortcut link (Windows)
In-Reply-To: <49FC7657.1040104@timgolden.me.uk>
References: <bda7ac6d0905020916j645815car9a55b49a1a984445@mail.gmail.com>
	<49FC7657.1040104@timgolden.me.uk>
Message-ID: <49FC7900.60603@timgolden.me.uk>

Tim Golden wrote:
> Windows shortcuts are Shell (ie GUI Desktop) objects rather
> than filesystem objects. The filesystem doesn't treat them
> specially; just returns the .lnk file (or whatever it's
> called). 

As a caveat: they don't actually *have* to be called .lnk
(altho' they almost universally are). That said, I don't know
any straightforward way of otherwise distinguishing shortcut
from non-shortcut files. I think you'd just have to call
.Load on the IPersist instance and catch the E_FAIL
exception.

TJG


From ebonak at hotmail.com  Sat May  2 13:00:03 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 02 May 2009 13:00:03 -0400
Subject: for with decimal values?
In-Reply-To: <gthnsv$uil$1@ger.gmane.org>
References: <gthnsv$uil$1@ger.gmane.org>
Message-ID: <gthu6j$elj$1@ger.gmane.org>

Thanks all, I appreciate the various suggestions and
caveats. Just wanted to make sure I'm not re-inventing
the wheel as Python seems to have already so much.

Cheers,
Esmail



From Justin at EmbeddedMicro.com  Sat May  2 13:12:19 2009
From: Justin at EmbeddedMicro.com (Justin Rajewski)
Date: Sat, 02 May 2009 10:12:19 -0700
Subject: Convert variable directly into a string (no ASCII)
Message-ID: <1241284339.3478.4.camel@justin-desktop>

Hello,

I need to print variables out over serial, however I need them to not be
in ASCII, ie if the variable is 5 then print 5 not "5".

The function that writes to the serial port requires a string and I can
send non-variables out with the string "/x05" for 5.

Is this even possible?

Thanks,
Justin



From basti.wiesner at gmx.net  Sat May  2 13:35:25 2009
From: basti.wiesner at gmx.net (Sebastian Wiesner)
Date: Sat, 02 May 2009 19:35:25 +0200
Subject: Question about the wording in the python documents.
References: <cb978535-4092-49ac-8d9f-a457d5fd61a5@k19g2000prh.googlegroups.com>
	<020b9acb$0$20667$c3e8da3@news.astraweb.com>
	<gth9um$d9i$1@hoshi.visyn.net>
	<4a751872-d92b-4b66-826e-f58a4c33bf16@v1g2000prd.googlegroups.com>
Message-ID: <gti08t$i5o$1@hoshi.visyn.net>

<grocery_stocker ? Samstag, 2. Mai 2009 17:30>

> On May 2, 4:14 am, Sebastian Wiesner <basti.wies... at gmx.net> wrote:
>> <Steven D'Aprano>>
>> > In either case, I think you're picking a nit so small that it isn't
>> > actually there. All objects are instances (in Python), and all
>> > instances are objects.
>>
>> Exactly, so strictly seen, "Request object" could possibly refer to the
>> urllib2.Request class itself.  I guess, the OP would prefer the term
>> "Request instance", emphasizing, that an instance of the request class
>> has to be passed, not he class itself.
> 
> Yes, I personally think that the term "Request instance" would have
> made it much clearer to us people that have never taken a computer
> science class in our lives.

Btw, I should have said, that I don't share your objection:  Imho you don't 
need computer science lessons, but only common sense to understand, that 
passing the class object itself doesn't really make sense in this context ;)

-- 
Freedom is always the freedom of dissenters.
                                      (Rosa Luxemburg)



From bearophileHUGS at lycos.com  Sat May  2 14:01:39 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sat, 2 May 2009 11:01:39 -0700 (PDT)
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
Message-ID: <bd847bb3-e52a-4755-8bc2-a795abfc92fc@o14g2000vbo.googlegroups.com>

Esmail:
> Is there a Python construct to allow me to do something like
> this:
> ? ? for i in range(-10.5, 10.5, 0.1):

Sometimes I use an improved version of this:
http://code.activestate.com/recipes/66472/

Bye,
bearophile


From ebonak at hotmail.com  Sat May  2 14:06:51 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 02 May 2009 14:06:51 -0400
Subject: for with decimal values?
In-Reply-To: <bd847bb3-e52a-4755-8bc2-a795abfc92fc@o14g2000vbo.googlegroups.com>
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<bd847bb3-e52a-4755-8bc2-a795abfc92fc@o14g2000vbo.googlegroups.com>
Message-ID: <gti23r$o36$1@ger.gmane.org>

bearophileHUGS at lycos.com wrote:
> Esmail:
>> Is there a Python construct to allow me to do something like
>> this:
>>     for i in range(-10.5, 10.5, 0.1):
> 
> Sometimes I use an improved version of this:
> http://code.activestate.com/recipes/66472/

neat .. lots of code to study there. Thanks,
Esmail



From nagle at animats.com  Sat May  2 14:10:32 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 02 May 2009 11:10:32 -0700
Subject: Is there any way this queue read can possibly block?
In-Reply-To: <e8c98b87-c768-4b09-b187-764c844e42e8@w35g2000prg.googlegroups.com>
References: <49f9e9c0$0$1604$742ec2ed@news.sonic.net>
	<e8c98b87-c768-4b09-b187-764c844e42e8@w35g2000prg.googlegroups.com>
Message-ID: <49fc83c4$0$1639$742ec2ed@news.sonic.net>

    That wasn't the problem.  An incoherent bug report from a user
was the problem.

				John Nagle

Carl Banks wrote:
> On Apr 30, 11:48 am, John Nagle <na... at animats.com> wrote:
>> def draininput(self) :  # consume any queued input
>>      try:
>>          while True :
>>              ch = self.inqueue.get_nowait()     # get input, if any
>>      except Queue.Empty:                                # if empty
>>          return                                 # done
>>
>> "self.inqueue" is a Queue object.  The intent here is to drain the
>> queue, then return.  Is there any way this can possibly block or hang?
> 
> Yes, but it'll be waiting to acquire the semaphore which Queues
> normally don't hold onto for long.
> 
> 
> Carl Banks
> 
>> I wouldn't think so.  Another thread is doing "put" operations,
>> but slowly, never more than 5 per second.
>>
>> (It's working for me, but a user of a program of mine is having a problem.)
>>
>>                                         John Nagle
> 


From rschroev_nospam_ml at fastmail.fm  Sat May  2 14:19:29 2009
From: rschroev_nospam_ml at fastmail.fm (Roel Schroeven)
Date: Sat, 02 May 2009 20:19:29 +0200
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <mailman.4968.1241260720.11746.python-list@python.org>
References: <200904301649.10341.kyrie@uh.cu><mailman.4899.1241167799.11746.python-list@python.org>	<2mKKl.16353$B17.1674@newsfe26.ams2>
	<mailman.4968.1241260720.11746.python-list@python.org>
Message-ID: <R80Ll.2617$_e5.314@newsfe21.ams2>

Hendrik van Rooyen schreef:
> : "Roel Schroeven" <rschroev_nospam_ml at fastmail.fm> wrote:

>> ...

> This is all true in the case of a job that starts, runs and finishes.
> I am not so sure it applies to something that has a long life.

It's true that I'm talking about work units with relatively short
lifetimes, mostly a few seconds but perhaps maximum about ten minutes. I
assumed that queues are mostly used for that kind of stuff. I've never
really thought about cases where that assumption doesn't hold, so it's
very well possible that all I've said is invalid in other cases.

>>> And if the stuff you pass around needs disparate effort to consume,
>>> it seems to me that you can more easily balance the load by having
>>> specialised consumers, instead of instances of one humungous 
>>> "I can eat anything" consumer.
>> If there is a semantic difference, maybe yes; but I think it makes no
>> sense to differentiate purely on the expected execution times.
> 
> The idea is basically that you have the code that classifies in one
> place only, instead of running in all the instances of the consumer.
> Feels better to me, somehow.

I most cases that I can imagine (and certainly in all cases I've used),
no classification whatsoever is even needed.

-- 
The saddest aspect of life right now is that science gathers knowledge
faster than society gathers wisdom.
  -- Isaac Asimov

Roel Schroeven


From apt.shansen at gmail.com  Sat May  2 14:24:15 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sat, 2 May 2009 11:24:15 -0700
Subject: Convert variable directly into a string (no ASCII)
In-Reply-To: <1241284339.3478.4.camel@justin-desktop>
References: <1241284339.3478.4.camel@justin-desktop>
Message-ID: <7a9c25c20905021124k5be73ecp3350f10be07081f8@mail.gmail.com>

> I need to print variables out over serial, however I need them to not be
> in ASCII, ie if the variable is 5 then print 5 not "5".
>
> The function that writes to the serial port requires a string and I can
> send non-variables out with the string "/x05" for 5.
>
> Is this even possible?
>

Check out the struct module.

>>> a = 5
>>> struct.pack("b", a)
'\x05'

--S
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From guenther.dietrich at spamfence.net  Sat May  2 14:33:25 2009
From: guenther.dietrich at spamfence.net (=?UTF-8?Q?G=C3=BCnther?= Dietrich)
Date: Sat, 02 May 2009 20:33:25 +0200
Subject: Convert variable directly into a string (no ASCII)
References: <mailman.4984.1241287107.11746.python-list@python.org>
Message-ID: <l8guc6-3e2.ln1@spamfence.net>

Justin Rajewski <Justin at EmbeddedMicro.com> wrote:

>I need to print variables out over serial, however I need them to not be
>in ASCII, ie if the variable is 5 then print 5 not "5".
>
>The function that writes to the serial port requires a string and I can
>send non-variables out with the string "/x05" for 5.

See module struct:

>>> struct.pack('b', 5)
'\x05'
>>> struct.pack('BBBB', 5, 150, 3, 224)
'\x05\x96\x03\xe0'



Regards,

G?nther


From krmane at gmail.com  Sat May  2 14:37:17 2009
From: krmane at gmail.com (Krishnakant)
Date: Sun, 03 May 2009 00:07:17 +0530
Subject: problem with money datatype based calculations in python
In-Reply-To: <20090502115734.b280bf35.darcy@druid.net>
References: <mailman.4963.1241250341.11746.python-list@python.org>
	<r8vtc6-vh1.ln1@spamfence.net>
	<20090502115734.b280bf35.darcy@druid.net>
Message-ID: <1241289437.3842.6.camel@kk-laptop>

On Sat, 2009-05-02 at 11:57 -0400, D'Arcy J.M. Cain wrote:
> And if you use PyGreSQL (http://www.PyGreSQL.org/) to connect to
> the database then the money type is already converted to Decimal.
> d'arcy, I visited the home page for pygresql and discovered that you wrote the library.
I am happy that you also included a non-dbapi (postgresql classic
interface ) along with the standard DBAPI module.

I would like to know if it has been tested with postgresql 8.3 and are
there any known bottlenecks while using this driver module on large
scale database opperations?
Is this actively maintained?
Perhaps this might be off topic but may I ask, how is pypgsql, 
>  
Has any one used pgsql for any postgresql based software?
and between pygresql and pypgsql which one is more maintained?

the system I am developing is a mission critical financial application
and I must be pritty sure about any module I am using.

happy hacking.
Krishnakant.





From martin at v.loewis.de  Sat May  2 14:41:38 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 02 May 2009 20:41:38 +0200
Subject: Convert variable directly into a string (no ASCII)
In-Reply-To: <mailman.4984.1241287107.11746.python-list@python.org>
References: <mailman.4984.1241287107.11746.python-list@python.org>
Message-ID: <49fc93e3$0$3652$9b622d9e@news.freenet.de>

> I need to print variables out over serial, however I need them to not be
> in ASCII, ie if the variable is 5 then print 5 not "5".
> 
> The function that writes to the serial port requires a string and I can
> send non-variables out with the string "/x05" for 5.
> 
> Is this even possible?

So you have a number N given, between 0 and 255, and you want to send
the byte whose ordinal is N. Right? Send chr(N).

HTH,
Martin


From doomster at knuut.de  Sat May  2 14:47:51 2009
From: doomster at knuut.de (Ulrich Eckhardt)
Date: Sat, 02 May 2009 20:47:51 +0200
Subject: Convert variable directly into a string (no ASCII)
References: <mailman.4984.1241287107.11746.python-list@python.org>
Message-ID: <763iqtF1b3p9cU1@mid.uni-berlin.de>

Justin Rajewski wrote:
> I need to print variables out over serial, however I need them to not be
> in ASCII, ie if the variable is 5 then print 5 not "5".
> 
> The function that writes to the serial port requires a string and I can
> send non-variables out with the string "/x05" for 5.

Take a look at the chr() function. For completeness, the complementary one
is ord(). However, also take a look at the 'struct' module, which is the
tool of choice if you want to do other formatting operations.

I seem to remember there was a third tool that can be used for similar
tasks, but I forgot which it was...

Uli



From jhmsmits at gmail.com  Sat May  2 14:53:17 2009
From: jhmsmits at gmail.com (SanPy)
Date: Sat, 2 May 2009 11:53:17 -0700 (PDT)
Subject: writing consecutive data to subprocess command 'more'
Message-ID: <b2ea7665-4a7e-4563-91ac-5d899e7903a3@t10g2000vbg.googlegroups.com>

I have this method that prints a given text via a subprocess command
'more' . It is like this:

def print_by_page(text):
    if hasattr(sys.stdout, 'isatty') and sys.stdout.isatty():
        viewer = 'more -EMR'
        proc = subprocess.Popen([viewer], shell=True,
stdin=subprocess.PIPE,
            stderr=subprocess.PIPE)
        try:
            stdout, stderr = proc.communicate(text)
        except OSError:
            pass
        else:
            if stderr: # probably no 'more' available on this system
                sys.stdout.write(text)
            return
    sys.stdout.write(text)

It works fine, but what I really want to do is first print a header
through the 'more' command, then fetch some data from the web, and
show it through the same 'more' command/process. And even more data,
another header, other data from the web, all through the same 'more'
command/process.
Can somebody help me out on this?

Regards,

Sander Smits


From timr at probo.com  Sat May  2 15:10:27 2009
From: timr at probo.com (Tim Roberts)
Date: Sat, 02 May 2009 12:10:27 -0700
Subject: Convert variable directly into a string (no ASCII)
References: <mailman.4984.1241287107.11746.python-list@python.org>
Message-ID: <5h6pv45424h4le90mjaoigq1cpror7tu0c@4ax.com>

Justin Rajewski <Justin at EmbeddedMicro.com> wrote:
>
>I need to print variables out over serial, however I need them to not be
>in ASCII, ie if the variable is 5 then print 5 not "5".
>
>The function that writes to the serial port requires a string and I can
>send non-variables out with the string "/x05" for 5.
>
>Is this even possible?

Of course.  The struct and array modules can help you with this.  Note that
you have to know how big each variable should be.

For example, if you want to sent 1, 2, and 3 out as bytes, you can do:

  a = 1
  b = 2
  c = 3
  serial = struct.pack( 'BBB', a, b, c )

If you need them as 16-bit ints, you can use H instead of B.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From debatem1 at gmail.com  Sat May  2 15:30:42 2009
From: debatem1 at gmail.com (CTO)
Date: Sat, 2 May 2009 12:30:42 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<mailman.4898.1241167327.11746.python-list@python.org>
	<7e908367-0604-4400-951e-9e172befc7e7@w31g2000prd.googlegroups.com>
	<mailman.4921.1241190260.11746.python-list@python.org>
	<ff9a9718-73a5-45f9-8c29-512cd344ac8b@r37g2000yqn.googlegroups.com>
	<b51e6b3a-3219-4b56-9b36-6494c059c761@y10g2000prc.googlegroups.com> 
	<75e47cc6-72bc-4941-802e-767f2187445f@d7g2000prl.googlegroups.com>
Message-ID: <7744f434-dd43-4010-ba25-90096f59d1d9@n7g2000prc.googlegroups.com>

> > PS) The asizeof(obj) function from this recipe <http://
> > code.activestate.com/recipes/546530> does size the object plus its
> > references, recursively.
>
> Correction, the last sentence should be: The asizeof(obj) ... plus its
> referents, recursively.

I will admit, I have *no idea* what that code is doing, but in looking
through the gc module documentation, I'm seeing the gc.get_objects
function. Would it be equivalent to what the OP is asking to track the
size of every element returned by that?



From rpmuller at gmail.com  Sat May  2 16:11:56 2009
From: rpmuller at gmail.com (Rick)
Date: Sat, 2 May 2009 13:11:56 -0700 (PDT)
Subject: Profiling gives very different predictions of best algorithm
References: <b0517781-5e42-492e-afa6-f5b83567de1c@j18g2000prm.googlegroups.com>
	<mailman.4947.1241214614.11746.python-list@python.org>
	<a6ec8b96-7374-44f0-918c-2f4940409c60@y34g2000prb.googlegroups.com>
	<mailman.4958.1241228310.11746.python-list@python.org>
	<74e32884-95b2-4e1d-9d3d-21f300bd8715@k19g2000prh.googlegroups.com>
Message-ID: <d7ce0fd6-cf1b-4195-bb5b-09d312f39ea8@u9g2000pre.googlegroups.com>

On May 2, 9:10?am, Rick <rpmul... at gmail.com> wrote:

> I was posting to the list mostly because I would like to know whether
> I can do something different when I profile my code so that it give
> results that correspond more closely to those that the nonprofiling
> results give.

A good comment that was emailed to me rather than being posted to the
list was to use cProfile rather than profile. Doing this gave much
more realistic results.


From seanm.py at gmail.com  Sat May  2 16:24:00 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Sat, 2 May 2009 13:24:00 -0700 (PDT)
Subject: Help! Can't get program to run.
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
	<mailman.4948.1241215845.11746.python-list@python.org>
Message-ID: <8f6634a2-c977-430a-b9f2-90ef9356d336@x6g2000vbg.googlegroups.com>

On May 1, 6:10?pm, Ned Deily <n... at acm.org> wrote:
> In article <7618rjF1a3t8... at mid.uni-berlin.de>,
> ?"Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
>
>
> > seanm... at gmail.com schrieb:
> > > I think this is maybe the most basic problem possible, but I can't get
> > > even the most basic Python to run on OS X using Terminal or IDLE. I
> > > used the IDLE editor to create a file with one line of code
>
> > > print 'text string'
>
> > > and I saved the file as module1.py. When using terminal I entered
> > > "python" to load the interpreter or whatever and then tried
>
> > > python module1.py
>
> > > but I got an error message. I've tried using the file path instead of
> > > module1.py and that didn't work either. I've tried moving the file to
> > > different places, my desktop, hard drive, etc., and none of that
> > > worked either. In IDLE I tried similar things and only got error
> > > messages there too.
>
> > > Needless to say this is a frustrating start to learning this langauge.
> > > I'd really appreciate any help getting this to work, so I can move on
> > > the actual language. Thanks so much.
>
> > It would have helped if you had given us the *actual* error-message.
> > ?From what little information you give, it appears as if you do
> > something very basic wrong - instead of doing
> > $ python
> > ?>>> python mymodule.py
> > (where $ is the shell/terminal and >>> the python-prompt)
> > you either do
> > $ python
> > ?>>> print "hello"
> > or
> > $ python mymodule.py
> > to execute mymodule directly.
>
> And from within OS X IDLE itself, if you create or open the file
> mymodule.py, it will be in a separate window and, as long as that window
> is selected, you can run the file directly within IDLE by selecting "Run
> Module" from the "Run" menu. ? So, no need to use the Terminal if you
> don't want to.
>
> --
> ?Ned Deily,
> ?n... at acm.org

Thank you for both for the help. I still cannot get the program to run
though. Below I've copied my commands and the error messages for you
(in IDLE then Terminal):

IDLE 2.6.2
>>> python module1.py
SyntaxError: invalid syntax

and

sean-marimpietris-computer:~ seanmarimpietri$ python
Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
[GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> python module1.py
  File "<stdin>", line 1
    python module1.py
                 ^
SyntaxError: invalid syntax



Again, any help would be appreciated. Thanks.


From arnodel at googlemail.com  Sat May  2 16:30:16 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 02 May 2009 21:30:16 +0100
Subject: Help! Can't get program to run.
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
	<mailman.4948.1241215845.11746.python-list@python.org>
	<8f6634a2-c977-430a-b9f2-90ef9356d336@x6g2000vbg.googlegroups.com>
Message-ID: <m2fxfn459j.fsf@googlemail.com>

seanm.py at gmail.com writes:

> sean-marimpietris-computer:~ seanmarimpietri$ python
> Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> python module1.py
>   File "<stdin>", line 1
>     python module1.py
>                  ^
> SyntaxError: invalid syntax
>
>
>
> Again, any help would be appreciated. Thanks.

>From Terminal.app, this should work:

sean-marimpietris-computer:~ seanmarimpietri$ python module1.py

Assuming that your module1.py file is in /Users/seanmarimpietri/

-- 
Arnaud


From gagsl-py2 at yahoo.com.ar  Sat May  2 16:35:19 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 02 May 2009 17:35:19 -0300
Subject: writing consecutive data to subprocess command 'more'
References: <b2ea7665-4a7e-4563-91ac-5d899e7903a3@t10g2000vbg.googlegroups.com>
Message-ID: <op.utbks5scx6zn5v@gabriel.sleipnir-bsas>

En Sat, 02 May 2009 15:53:17 -0300, SanPy <jhmsmits at gmail.com> escribi?:

> I have this method that prints a given text via a subprocess command
> 'more' . It is like this:
>
> def print_by_page(text):
>     if hasattr(sys.stdout, 'isatty') and sys.stdout.isatty():
>         viewer = 'more -EMR'
>         proc = subprocess.Popen([viewer], shell=True,
> stdin=subprocess.PIPE,
>             stderr=subprocess.PIPE)
>         try:
>             stdout, stderr = proc.communicate(text)
>         except OSError:
>             pass
>         else:
>             if stderr: # probably no 'more' available on this system
>                 sys.stdout.write(text)
>             return
>     sys.stdout.write(text)
>
> It works fine, but what I really want to do is first print a header
> through the 'more' command, then fetch some data from the web, and
> show it through the same 'more' command/process. And even more data,
> another header, other data from the web, all through the same 'more'
> command/process.
> Can somebody help me out on this?

communicate writes to the child's stdin and waits for it to finish. If you  
want to keep writing, don't use communicate. And you'll need to keep state  
 from one call to another, so use a class. Based on the code above, create  
a class Pager with __init__, write and close methods:

class Pager:
  def __init__(self):
   # copy the logic above
   self.proc = subprocess.Popen(...)
   self.file = self.proc.stdin
   # if something goes wrong, set self.proc=None and self.file=sys.stdout

  def write(self, text):
   self.file.write(text)

  def close(self):
   if self.proc:
    self.file.close()
    self.proc.wait()

Also, take a look at the pager function in the pydoc module (see the  
source) - it handles several cases.

-- 
Gabriel Genellina



From seanm.py at gmail.com  Sat May  2 16:36:00 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Sat, 2 May 2009 13:36:00 -0700 (PDT)
Subject: Most Basic Question Ever - please help
Message-ID: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>

I am going to try posting here again with more detail to see if I can
finally get my first program to work.

I am working on a MacBook Pro with OS X 10.4.11. I opened a new window
in IDLE to create a file. The file had only one line of code and was
saved as module1.py. I saved it to Macintosh HD. The one line of code
in the file is copied below:

print 'Hello module world!'

I closed the file and tried to run it in IDLE and Terminal, but I have
had no success. I'll paste my commands and the error messages below
(for IDLE, then Terminal). Any help would be very much appreciated. I
feel like the marathon just started and I've fallen flat on my face.
Thanks.

IDLE 2.6.2
>>> python module1.py
SyntaxError: invalid syntax


sean-m-computer:~ seanm$ python
Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
[GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> python module1.py
  File "<stdin>", line 1
    python module1.py
                 ^
SyntaxError: invalid syntax






From piet at cs.uu.nl  Sat May  2 16:37:24 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 02 May 2009 22:37:24 +0200
Subject: writing consecutive data to subprocess command 'more'
References: <b2ea7665-4a7e-4563-91ac-5d899e7903a3@t10g2000vbg.googlegroups.com>
Message-ID: <m2fxfnp7gb.fsf@cs.uu.nl>

>>>>> SanPy <jhmsmits at gmail.com> (S) wrote:

>S> I have this method that prints a given text via a subprocess command
>S> 'more' . It is like this:

>S> def print_by_page(text):
>S>     if hasattr(sys.stdout, 'isatty') and sys.stdout.isatty():
>S>         viewer = 'more -EMR'
>S>         proc = subprocess.Popen([viewer], shell=True,
>S> stdin=subprocess.PIPE,
>S>             stderr=subprocess.PIPE)
>S>         try:
>S>             stdout, stderr = proc.communicate(text)
>S>         except OSError:
>S>             pass
>S>         else:
>S>             if stderr: # probably no 'more' available on this system
>S>                 sys.stdout.write(text)
>S>             return
>S>     sys.stdout.write(text)

>S> It works fine, but what I really want to do is first print a header
>S> through the 'more' command, then fetch some data from the web, and
>S> show it through the same 'more' command/process. And even more data,
>S> another header, other data from the web, all through the same 'more'
>S> command/process.
>S> Can somebody help me out on this?

You have to split this. Do the startup (creating the subprocess) once,
and then for each piece of text that you want to pass through 'more' do
stdout, stderr = proc.communicate(text)

By the way, in this last line, stdout should come out empty because the
output of more doesn't come back to the parent process, but goes to the
original stdout of the calling script.

Also I would use the following:
    viewer = ['more', '-EMR']
    proc = subprocess.Popen(viewer, stdin=subprocess.PIPE, 
                                    stderr=subprocess.PIPE)
No reason to use a shell.

And if there is no 'more' available you get an exception on the Popen
already. You don't have to wait until the communicate call.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From seanm.py at gmail.com  Sat May  2 16:42:03 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Sat, 2 May 2009 13:42:03 -0700 (PDT)
Subject: Help! Can't get program to run.
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
	<mailman.4948.1241215845.11746.python-list@python.org> 
	<8f6634a2-c977-430a-b9f2-90ef9356d336@x6g2000vbg.googlegroups.com> 
	<m2fxfn459j.fsf@googlemail.com>
Message-ID: <02786fbc-c881-4f68-9877-c662d6362b8e@s31g2000vbp.googlegroups.com>

On May 2, 4:30?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
> seanm... at gmail.com writes:
> > sean-marimpietris-computer:~ seanmarimpietri$ python
> > Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> > [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> > Type "help", "copyright", "credits" or "license" for more information.
> >>>> python module1.py
> > ? File "<stdin>", line 1
> > ? ? python module1.py
> > ? ? ? ? ? ? ? ? ?^
> > SyntaxError: invalid syntax
>
> > Again, any help would be appreciated. Thanks.
>
> From Terminal.app, this should work:
>
> sean-marimpietris-computer:~ seanmarimpietri$ python module1.py
>
> Assuming that your module1.py file is in /Users/seanmarimpietri/
>
> --
> Arnaud

Awesome. Thank you, Arnaud. I moved the file to that folder, and I got
it to work in Terminal. However, I still can't get it to run using
IDLE. Any idea why that might be? Thanks again. -Sean


From bvidinli at gmail.com  Sat May  2 16:42:31 2009
From: bvidinli at gmail.com (bvidinli)
Date: Sat, 2 May 2009 23:42:31 +0300
Subject: eric not working on ubuntu 9.04
Message-ID: <36e8a7020905021342g64efbe30l36230bb0df407ffe@mail.gmail.com>

any idea ?
here is output:

bvidinli at bvidinli-yenihdd:~$ eric
Warning: translation file 'qt_tr_TR'could not be loaded.
Using default.
Warning: translation file 'qscintilla_tr_TR'could not be loaded.
Using default.
Exception RuntimeError: 'maximum recursion depth exceeded while
calling a Python object' in <type 'exceptions.AttributeError'> ignored
Exception RuntimeError: 'maximum recursion depth exceeded in
__subclasscheck__' in <type 'exceptions.AttributeError'> ignored
An unhandled exception occurred. Please report the problem
using the error reporting dialog or via email to <eric4-bugs at die-offenbachs.de>.
A log has been written to "/home/bvidinli/.eric4/eric4_error.log".

Error information:
--------------------------------------------------------------------------------
2009-05-02, 23:42:05
--------------------------------------------------------------------------------
<type 'exceptions.ImportError'>:
cannot import name walk
--------------------------------------------------------------------------------
  File "/usr/share/eric/modules/eric4.py", line 250, in <module>
    main()
  File "/usr/share/eric/modules/eric4.py", line 229, in main
    from UI.UserInterface import UserInterface
  File "/usr/share/eric/modules/UI/UserInterface.py", line 66, in <module>
    from EmailDialog import EmailDialog
  File "/usr/share/eric/modules/UI/EmailDialog.py", line 28, in <module>
    from email.MIMEBase import MIMEBase
  File "/usr/lib/python2.6/email/__init__.py", line 79, in __getattr__
    __import__(self.__name__)
  File "/usr/lib/python2.6/email/mime/base.py", line 9, in <module>
    from email import message
  File "/usr/lib/python2.6/email/message.py", line 90, in <module>
    class Message:
  File "/usr/lib/python2.6/email/message.py", line 790, in Message
    from email.Iterators import walk

--------------------------------------------------------------------------------
Version Numbers:
  Python 2.6.2
  KDE 4.2.2
  PyKDE 4.0.2
  Qt 4.5.0
  PyQt4 4.4.4
  sip sip version not available
  QScintilla 2.3.2
  eric4 4.3.0 (r2852)

Platform: linux2
2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
[GCC 4.3.3]
--------------------------------------------------------------------------------
Distribution Info:
  /etc/lsb-release
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=9.04
  DISTRIB_CODENAME=jaunty
  DISTRIB_DESCRIPTION="Ubuntu 9.04"
bvidinli at bvidinli-yenihdd:~$


From gert.cuykens at gmail.com  Sat May  2 16:44:58 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 2 May 2009 13:44:58 -0700 (PDT)
Subject: return functions
Message-ID: <f6a8cbe2-2078-4e0a-8b52-6437b440d18d@o30g2000vbc.googlegroups.com>

Aldo i like the cerrypy wsgi server very much, i do not like the tools
that go with it
so i am stuck with a configuration file that looks like this

http://pastebin.com/m4d8184bc

After 152 line I finally arrived to a point where i was thinkig "thats
it, this is like going to work on a uni cycle and is just plain
ridicules"

So how can i generate some functions something like

def generate(url,type): # where type could be htm js css or wsgi


From davea at ieee.org  Sat May  2 16:46:16 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 02 May 2009 16:46:16 -0400
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <49FCAFAC.40800@ieee.org>
References: <200904301649.10341.kyrie@uh.cu><mailman.4899.1241167799.11746.python-list@python.org>	<2mKKl.16353$B17.1674@newsfe26.ams2>
	<00a601c9cb12$152d25e0$0d00a8c0@Hendrik> <49FCAFAC.40800@ieee.org>
Message-ID: <49FCB118.3010908@ieee.org>

Hendrik van Rooyen wrote:
> : "Roel Schroeven" <rschroev_nospam_ml at fastmail.fm> wrote:
>
>
>  
>> Hendrik van Rooyen schreef:
>>    
>>> I have always wondered why people do the one queue many getters thing.
>>>       
>> Because IMO it's the simplest and most elegant solution.
>>     
>
> That is fair enough...
>
>  
>>> Given that the stuff you pass is homogenous in that it will require a
>>> similar amount of effort to process, is there not a case to be made
>>> to have as many queues as consumers, and to round robin the work?
>>>       
>> Could work if the processing time for each work unit is exactly the same
>> (otherwise one or more consumers will be idle part of the time), but in
>> most cases that is not guaranteed. A simple example is fetching data
>> over the network: even if the data size is always the same, there will
>> be differences because of network load variations.
>>
>> If you use one queue, each consumer fetches a new work unit as soon it
>> has consumed the previous one. All consumers will be working as long as
>> there is work to do, without having to write any code to do the load
>> balancing.
>>
>> With one queue for each consumer, you either have to assume that the
>> average processing time is the same (otherwise some consumers will be
>> idle at the end, while others are still busy processing work units), or
>> you need some clever code in the producer(s) or the driving code to
>> balance the loads. That's extra complexity for little or no benefit.
>>
>> I like the simplicity of having one queue: the producer(s) put work
>> units on the queue with no concern which consumer will process them or
>> how many consumers there even are; likewise the consumer(s) don't know
>> and don't need to know where their work units come from. And the work
>> gets automatically distributed to whichever consumer has first finished
>> its previous work unit.
>>     
>
> This is all true in the case of a job that starts, runs and finishes.
> I am not so sure it applies to something that has a long life.
>
>  
>>> And if the stuff you pass around needs disparate effort to consume,
>>> it seems to me that you can more easily balance the load by having
>>> specialised consumers, instead of instances of one humungous "I can 
>>> eat anything" consumer.
>>>       
>> If there is a semantic difference, maybe yes; but I think it makes no
>> sense to differentiate purely on the expected execution times.
>>     
>
> The idea is basically that you have the code that classifies in one
> place only, instead of running in all the instances of the consumer.
> Feels better to me, somehow.
>   <snip>
If the classifying you're doing is just based on expected time to 
consume the item, then I think your plan to use separate queues is 
misguided.

If the consumers are interchangeable in their abilities, then feeding 
them from a single queue is more efficient, both on average wait time, 
worst-case wait time, and on consumer utilization, in nearly all 
non-pathological scenarios.  Think the line at the bank.  There's a good 
reason they now have a single line for multiple tellers.  If you have 
five tellers, and one of your transactions is really slow, the rest of 
the line is only slowed down by 20%, rather than a few people being 
slowed down by a substantial amount because they happen to be behind the 
slowpoke.  30 years ago, they'd have individual lines, and I tried in 
vain to explain queuing theory to the bank manager.

Having said that, notice that sometimes the consumers in a computer are 
not independent.  If you're running 20 threads with this model, on a 
processor with only two cores, and if the tasks are CPU bound, you're 
wasting lots of thread-management time without gaining anything.  
Similarly, if there are other shared resources that all the threads trip 
over, it may not pay to do as many of them in parallel.  But for 
homogeneous consumers, do them with a single queue, and do benchmarks to 
determine the optimum number of consumers to start.



From gert.cuykens at gmail.com  Sat May  2 16:58:10 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 2 May 2009 13:58:10 -0700 (PDT)
Subject: return functions
References: <f6a8cbe2-2078-4e0a-8b52-6437b440d18d@o30g2000vbc.googlegroups.com>
Message-ID: <2b9deb7a-327d-40b2-8df9-d6db916a6bab@s28g2000vbp.googlegroups.com>

On May 2, 10:44?pm, gert <gert.cuyk... at gmail.com> wrote:
> Aldo i like the cerrypy wsgi server very much, i do not like the tools
> that go with it
> so i am stuck with a configuration file that looks like this
>
> http://pastebin.com/m4d8184bc
>
> After 152 line I finally arrived to a point where i was thinkig "thats
> it, this is like going to work on a uni cycle and is just plain
> ridicules"
>
> So how can i generate some functions something like
>
> def generate(url,type): # where type could be htm js css or wsgi

I was thinking something like this ?

def static(url, mime):
    def application(environ, response):
        f=open(os.path.join(os.path.dirname(__file__), url),'rb')
        l=os.fstat(f.fileno()).st_size
        response('200 OK', [('Content-type', mime+';charset=utf-8'),
('Content-Length', str(l))])
        return FileWrapper(f, 8192)
    return application


From jhmsmits at gmail.com  Sat May  2 17:00:44 2009
From: jhmsmits at gmail.com (SanPy)
Date: Sat, 2 May 2009 14:00:44 -0700 (PDT)
Subject: writing consecutive data to subprocess command 'more'
References: <b2ea7665-4a7e-4563-91ac-5d899e7903a3@t10g2000vbg.googlegroups.com>
	<mailman.4988.1241296526.11746.python-list@python.org>
Message-ID: <c9776d62-5d87-4f6c-b002-3690c6e21e87@t11g2000vbc.googlegroups.com>

Thanks, that works beautifully!

Regards,
Sander

On 2 mei, 22:35, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Sat, 02 May 2009 15:53:17 -0300, SanPy <jhmsm... at gmail.com> escribi?:
>
>
>
>
>
> > I have this method that prints a given text via a subprocess command
> > 'more' . It is like this:
>
> > def print_by_page(text):
> > ? ? if hasattr(sys.stdout, 'isatty') and sys.stdout.isatty():
> > ? ? ? ? viewer = 'more -EMR'
> > ? ? ? ? proc = subprocess.Popen([viewer], shell=True,
> > stdin=subprocess.PIPE,
> > ? ? ? ? ? ? stderr=subprocess.PIPE)
> > ? ? ? ? try:
> > ? ? ? ? ? ? stdout, stderr = proc.communicate(text)
> > ? ? ? ? except OSError:
> > ? ? ? ? ? ? pass
> > ? ? ? ? else:
> > ? ? ? ? ? ? if stderr: # probably no 'more' available on this system
> > ? ? ? ? ? ? ? ? sys.stdout.write(text)
> > ? ? ? ? ? ? return
> > ? ? sys.stdout.write(text)
>
> > It works fine, but what I really want to do is first print a header
> > through the 'more' command, then fetch some data from the web, and
> > show it through the same 'more' command/process. And even more data,
> > another header, other data from the web, all through the same 'more'
> > command/process.
> > Can somebody help me out on this?
>
> communicate writes to the child's stdin and waits for it to finish. If you ?
> want to keep writing, don't use communicate. And you'll need to keep state ?
> ?from one call to another, so use a class. Based on the code above, create ?
> a class Pager with __init__, write and close methods:
>
> class Pager:
> ? def __init__(self):
> ? ?# copy the logic above
> ? ?self.proc = subprocess.Popen(...)
> ? ?self.file = self.proc.stdin
> ? ?# if something goes wrong, set self.proc=None and self.file=sys.stdout
>
> ? def write(self, text):
> ? ?self.file.write(text)
>
> ? def close(self):
> ? ?if self.proc:
> ? ? self.file.close()
> ? ? self.proc.wait()
>
> Also, take a look at the pager function in the pydoc module (see the ?
> source) - it handles several cases.
>
> --
> Gabriel Genellina



From rhodri at wildebst.demon.co.uk  Sat May  2 17:21:15 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 02 May 2009 22:21:15 +0100
Subject: Help! Can't get program to run.
In-Reply-To: <02786fbc-c881-4f68-9877-c662d6362b8e@s31g2000vbp.googlegroups.com>
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
	<mailman.4948.1241215845.11746.python-list@python.org>
	<8f6634a2-c977-430a-b9f2-90ef9356d336@x6g2000vbg.googlegroups.com>
	<m2fxfn459j.fsf@googlemail.com>
	<02786fbc-c881-4f68-9877-c662d6362b8e@s31g2000vbp.googlegroups.com>
Message-ID: <op.utbmxphda8ncjz@gnudebst>

On Sat, 02 May 2009 21:42:03 +0100, <seanm.py at gmail.com> wrote:

> Awesome. Thank you, Arnaud. I moved the file to that folder, and I got
> it to work in Terminal. However, I still can't get it to run using
> IDLE. Any idea why that might be? Thanks again. -Sean

To repeat what you were told earlier, IDLE is an interactive Python
shell, not a command line.  It executes Python commands directly, like

>>> print "Hello, world"

"python mymodule.py" is *not* a Python command.

To run your script from within IDLE, you have two choices: either
open the script to edit with IDLE (menu File->Open or Ctrl-O) and
use menu Run->Run Module or F5 to run it; or (assuming mymodule.py
is in your home directory) type

>>> import mymodule

The former has a few gotchas that you probably won't hit, and the
latter has several that you almost certainly will hit.  Personally
I'd stick with the command line that you've already succeeded with!

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From nad at acm.org  Sat May  2 17:30:40 2009
From: nad at acm.org (Ned Deily)
Date: Sat, 02 May 2009 14:30:40 -0700
Subject: Help! Can't get program to run.
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
	<mailman.4948.1241215845.11746.python-list@python.org>
	<8f6634a2-c977-430a-b9f2-90ef9356d336@x6g2000vbg.googlegroups.com>
Message-ID: <nad-4A0564.14304002052009@news.gmane.org>

In article 
<8f6634a2-c977-430a-b9f2-90ef9356d336 at x6g2000vbg.googlegroups.com>,
 seanm.py at gmail.com wrote:
> Thank you for both for the help. I still cannot get the program to run
> though. Below I've copied my commands and the error messages for you
> (in IDLE then Terminal):
> 
> IDLE 2.6.2
> >>> python module1.py
> SyntaxError: invalid syntax

The default IDLE window is a python shell window.  That is, you are 
already "inside" the python interpreter, the same as if you typed just 
"python", with no file name, in the Terminal window.  You can use that 
to execute python statements and introspect objects, among other things.  
Try it.

But, back in IDLE, ignore that window for the moment and use the Open 
command in the File Menu to select and open your file module1.py from 
whatever directory it is in.  A new window should open with the contents 
of that file.  With that window selected (click on it, if necessary), 
there should be a "Run" option in the Menu bar and under it will be a 
"Run Script" option that will cause the script to run and the output to 
appear in the shell window.  You can then explore the other options 
available in IDLE for debugging, etc.

-- 
 Ned Deily,
 nad at acm.org



From mike.blonder at gmail.com  Sat May  2 17:40:34 2009
From: mike.blonder at gmail.com (mikefromvt)
Date: Sat, 2 May 2009 14:40:34 -0700 (PDT)
Subject: Need Help with str.replace & tuples
Message-ID: <90983bf0-c21d-44f5-91c1-873c484678b9@s16g2000vbp.googlegroups.com>

Hello.

I am very very unfamiliar with Python and need to update a Python
script.  What I need to do is to replace three variables (already
defined in the script) within a string.  The present script correctly
replaces two of the three variables.  I am unable to add a third
variable.  Specifically, I would like to add

"panoble",panoble

to the following code:

idxItemStr+=string.replace(string.replace
(idxItemTplStr,"stylenumber",stylenumber),"formalname",formalname)

and, specifically as regards

idxItemTplStr

Is this possible?

Thanks

Mike




From apt.shansen at gmail.com  Sat May  2 17:44:43 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sat, 2 May 2009 14:44:43 -0700
Subject: Most Basic Question Ever - please help
In-Reply-To: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
References: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
Message-ID: <7a9c25c20905021444x620ed83cmf95d0381df185712@mail.gmail.com>

>
> IDLE 2.6.2
> >>> python module1.py
> SyntaxError: invalid syntax
>

The ">>>" prompt is Python's interactive interpreter. Once you are here, you
already are in python-- so typing "python" again is redundant and invalid.
>From this prompt you type in python code.

I have never used IDLE so can't comment on how to get it to run modules and
collect output-- but I suspect when your file is open in IDLE there's a menu
option that says something about Run.

But....


> sean-m-computer:~ seanm$ python
> Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> python module1.py
>  File "<stdin>", line 1
>    python module1.py
>                 ^
> SyntaxError: invalid syntax
>

Same thing. You're starting python: then doing 'python module1.py' within
Python, which doesn't make sense. If you want Python to run the module, just
do "python module1.py" instead of "python" from your command prompt.

--S
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From davea at ieee.org  Sat May  2 17:46:15 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 02 May 2009 17:46:15 -0400
Subject: Most Basic Question Ever - please help
In-Reply-To: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
References: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
Message-ID: <49FCBF27.5060103@ieee.org>

seanm.py at gmail.com wrote:
> I am going to try posting here again with more detail to see if I can
> finally get my first program to work.
>
> I am working on a MacBook Pro with OS X 10.4.11. I opened a new window
> in IDLE to create a file. The file had only one line of code and was
> saved as module1.py. I saved it to Macintosh HD. The one line of code
> in the file is copied below:
>
> print 'Hello module world!'
>
> I closed the file and tried to run it in IDLE and Terminal, but I have
> had no success. I'll paste my commands and the error messages below
> (for IDLE, then Terminal). Any help would be very much appreciated. I
> feel like the marathon just started and I've fallen flat on my face.
> Thanks.
>
> IDLE 2.6.2
>   
>>>> python module1.py
>>>>         
> SyntaxError: invalid syntax
>
>
> sean-m-computer:~ seanm$ python
> Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>   
>>>> python module1.py
>>>>         
>   File "<stdin>", line 1
>     python module1.py
>                  ^
> SyntaxError: invalid syntax
>
>
>   
In both cases, you're already running python.  Why would you expect to 
have to run python inside python?

Once you're at a python prompt (in either of your cases), you use the 
command "import" to load a module.  And you do not put the ".py" 
extension on the parameter.  Specifically, it should look like this, and 
very similar for IDLE.

M:\Programming\Python\sources\temp>c:\ProgFiles\Python26\python.exe
Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit 
(Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
 >>> import module1
Hello module world!
 >>>

>
>   


From bearophileHUGS at lycos.com  Sat May  2 18:12:36 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sat, 2 May 2009 15:12:36 -0700 (PDT)
Subject: Dictionary, integer compression
References: <c9dd453d-e3ca-4cc5-9013-5059ce9298ef@f1g2000prb.googlegroups.com>
	<368d63c2-0467-4c3e-a623-2a39ef3d92c7@r31g2000prh.googlegroups.com> 
	<bd82431c-c271-4481-8c35-7d27e59fba56@s38g2000prg.googlegroups.com> 
	<20dee642-fbfa-4c9f-a182-7319077298e5@t36g2000prt.googlegroups.com> 
	<aea63855-72a3-4c0f-948c-bc4f97064ba5@k19g2000prh.googlegroups.com>
Message-ID: <5fe34cf2-e56c-4ed2-a2fd-7c2fc7d5efcc@o27g2000vbd.googlegroups.com>

dineshv:
> Thanks for that about Python3. ?My integers range from 0 to 9,999,999
> and I have loads of them. ?Do you think Python3 will help?

Nope.
Bye,
bearophile


From gert.cuykens at gmail.com  Sat May  2 18:17:54 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 2 May 2009 15:17:54 -0700 (PDT)
Subject: return functions
References: <f6a8cbe2-2078-4e0a-8b52-6437b440d18d@o30g2000vbc.googlegroups.com>
	<2b9deb7a-327d-40b2-8df9-d6db916a6bab@s28g2000vbp.googlegroups.com>
Message-ID: <0b04c45d-0152-4498-a331-a19452c29b2f@l28g2000vba.googlegroups.com>

On May 2, 10:58?pm, gert <gert.cuyk... at gmail.com> wrote:
> On May 2, 10:44?pm, gert <gert.cuyk... at gmail.com> wrote:
>
> > Aldo i like the cerrypy wsgi server very much, i do not like the tools
> > that go with it
> > so i am stuck with a configuration file that looks like this
>
> >http://pastebin.com/m4d8184bc
>
> > After 152 line I finally arrived to a point where i was thinkig "thats
> > it, this is like going to work on a uni cycle and is just plain
> > ridicules"
>
> > So how can i generate some functions something like
>
> > def generate(url,type): # where type could be htm js css or wsgi
>
> I was thinking something like this ?
>
> def static(url, mime):
> ? ? def application(environ, response):
> ? ? ? ? f=open(os.path.join(os.path.dirname(__file__), url),'rb')
> ? ? ? ? l=os.fstat(f.fileno()).st_size
> ? ? ? ? response('200 OK', [('Content-type', mime+';charset=utf-8'),
> ('Content-Length', str(l))])
> ? ? ? ? return FileWrapper(f, 8192)
> ? ? return application

it works, i reduced it to this :-)

http://code.google.com/p/appwsgi/source/browse/trunk/server.py

any other suggestions to make it smaller and more automatic ?



From bearophileHUGS at lycos.com  Sat May  2 18:22:34 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sat, 2 May 2009 15:22:34 -0700 (PDT)
Subject: Need Help with str.replace & tuples
References: <90983bf0-c21d-44f5-91c1-873c484678b9@s16g2000vbp.googlegroups.com>
Message-ID: <f1ad962b-5777-46cb-8f96-277ea51aba3c@t10g2000vbg.googlegroups.com>

mikefromvt:
> I am very very unfamiliar with Python and need to update a Python
> script. ?What I need to do is to replace three variables (already
> defined in the script) within a string. ?The present script correctly
> replaces two of the three variables. ?I am unable to add a third
> variable. ?Specifically, I would like to add
>
> "panoble",panoble
> to the following code:
> idxItemStr+=string.replace(string.replace
(idxItemTplStr,"stylenumber",stylenumber),"formalname",formalname)

This isn't going to win some contest of coding style quality, but you
may try this (for other people: I have not added any new variable name
on purpose):

idxItemStr += idxItemTplStr.replace("stylenumber",
              stylenumber).replace("formalname",
              formalname).replace("panoble", panoble)

Note that in Python names are usually written like this:
idx_item_tpl
Instead of:
idxItemTplStr

Bye,
bearophile


From sjmachin at lexicon.net  Sat May  2 18:25:26 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 2 May 2009 15:25:26 -0700 (PDT)
Subject: Most Basic Question Ever - please help
References: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
	<mailman.4994.1241300789.11746.python-list@python.org>
Message-ID: <0b10f7fd-9b08-40d4-8395-83bdfe860f90@v23g2000pro.googlegroups.com>

On May 3, 7:46?am, Dave Angel <da... at ieee.org> wrote:
> seanm... at gmail.com wrote:
> > I am going to try posting here again with more detail to see if I can
> > finally get my first program to work.
>
> > I am working on a MacBook Pro with OS X 10.4.11. I opened a new window
> > in IDLE to create a file. The file had only one line of code and was
> > saved as module1.py. I saved it to Macintosh HD. The one line of code
> > in the file is copied below:
>
> > print 'Hello module world!'
>
> > I closed the file and tried to run it in IDLE and Terminal, but I have
> > had no success. I'll paste my commands and the error messages below
> > (for IDLE, then Terminal). Any help would be very much appreciated. I
> > feel like the marathon just started and I've fallen flat on my face.
> > Thanks.
>
> > IDLE 2.6.2
>
> >>>> python module1.py
>
> > SyntaxError: invalid syntax
>
> > sean-m-computer:~ seanm$ python
> > Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> > [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> > Type "help", "copyright", "credits" or "license" for more information.
>
> >>>> python module1.py
>
> > ? File "<stdin>", line 1
> > ? ? python module1.py
> > ? ? ? ? ? ? ? ? ?^
> > SyntaxError: invalid syntax
>
> In both cases, you're already running python. ?Why would you expect to
> have to run python inside python?
>
> Once you're at a python prompt (in either of your cases), you use the
> command "import" to load a module. ?And you do not put the ".py"
> extension on the parameter. ?Specifically, it should look like this, and
> very similar for IDLE.
>
> M:\Programming\Python\sources\temp>c:\ProgFiles\Python26\python.exe
> Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit
> (Intel)] on
> win32
> Type "help", "copyright", "credits" or "license" for more information.
> ?>>> import module1
> Hello module world!
> ?>>>

Dave, importing modules which have side effects like printing is NOT a
good habit to which a beginner should be introduced. He needs to know
how to run a script.

Sean, in Terminal, instead of typing
    python
type
    python module1.py

and I suggest that you give your script (not module) a more meaningful
name.

HTH,
John


From sjmachin at lexicon.net  Sat May  2 18:45:31 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 2 May 2009 15:45:31 -0700 (PDT)
Subject: problem with money datatype based calculations in python
References: <1241250322.4669.13.camel@kk-laptop>
	<mailman.4973.1241273412.11746.python-list@python.org>
Message-ID: <aff9d3d3-b38e-4fd0-b621-e05b2b4217c4@w35g2000prg.googlegroups.com>

On May 3, 12:09?am, Dave Angel <da... at ieee.org> wrote:
> Krishnakant wrote:
> > hello all,
> > I am using postgresql as a database server for my db application.
>
> > The database is related to accounts and point of sales and many
> > calculations involve money datatype.
>
> > The application logic is totally done in python. ?Now the problem is
> > that there is a situation where we calculate tax on % of the total
> > amount on the invoice. ?The ?percentage is in terms of float but the
> > eventual amount has to be in a money datatype.
>
> > The product cost comes in money datatype from postgresql and the tax %
> > comes in float. ?So I would like to know if python supports some thing
> > similar to money datatype so that I can cast my total amount (in money )
> > divided by tax% (in float ) so money divided by float should be the
> > result and that result should be in money datatype.
> > For example a product x has the cost Rs. 100 which is stored in the
> > tabel as money type. ?and in the tax table for that product the VAT is
> > 5% and this 5% is stored in float datatype. ?So after using both these
> > values the resulting total 105Rs. should be in money type and not float.
> > I awaite some reply,
> > Thanks in advice.
> > happy hacking.
> > Krishnakant.
>
> Tax rate isn't divided, it's multiplied. ?But probably that's just a
> typo in your message.
>
> Short answer is use your money class to convert the float into money. ?
> And then test, to see that's really what you wanted. ?Be sure and check
> the edge cases, because float is a binary system, and you can get both
> quantization and rounding problems converting between them.
>
> Is the money you're dealing with decimal-based? ?So maybe money values
> are integers plus two more digits of fractional precision?
>
> It's going to be tough for somebody with no access to that "money type"
> to guess what your problem is. ?What operations does it currently
> support? ?If it supports multiply, then just change the tax rate to be a
> money type.

Aarrgghh!! If the "money type" supports multiplying money by money,
the author should be put in the stocks and pelted with rotten
vegetables.

(IMHO)



From ben+python at benfinney.id.au  Sat May  2 19:48:34 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 03 May 2009 09:48:34 +1000
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
Message-ID: <8763gjm5gt.fsf@benfinney.id.au>

Esmail <ebonak at hotmail.com> writes:

> Hello all,
> 
> Is there a Python construct to allow me to do something like
> this:
> 
>    for i in range(-10.5, 10.5, 0.1):
>      ...

Note that those values are of type ?float?, which is a distinct type
from ?Decimal? with very different behaviour.

> If there is such a thing already available, I'd like to use it,
> otherwise I can write a function to mimic this, but I thought I'd
> check (my search yielded nothing).

You can write a function to do it.

Alternatively, this case seems simple enough that you can write a
generator expression. Assuming you want ?Decimal? values:

    >>> from decimal import Decimal
    >>> amounts = (Decimal(mantissa)/10 for mantissa in range(-105, 105))
    >>> for amount in amounts:
    ...     print amount
    ...
    -10.5
    -10.4
    -10.3
    -10.2
    -10.1
    -10
    -9.9
    ?
    9.6
    9.7
    9.8
    9.9
    10
    10.1
    10.2
    10.3
    10.4

-- 
 \      ?I have a large seashell collection, which I keep scattered on |
  `\    the beaches all over the world. Maybe you've seen it.? ?Steven |
_o__)                                                           Wright |
Ben Finney


From seanm.py at gmail.com  Sat May  2 20:08:07 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Sat, 2 May 2009 17:08:07 -0700 (PDT)
Subject: Help! Can't get program to run.
References: <77a2fc3c-638d-4aef-bae9-3b1ea9d4e988@c36g2000yqn.googlegroups.com>
	<7618rjF1a3t8jU1@mid.uni-berlin.de>
	<mailman.4948.1241215845.11746.python-list@python.org> 
	<8f6634a2-c977-430a-b9f2-90ef9356d336@x6g2000vbg.googlegroups.com> 
	<mailman.4992.1241299856.11746.python-list@python.org>
Message-ID: <85d158e7-6d31-46ca-8c61-85d422a16087@21g2000vbk.googlegroups.com>

On May 2, 5:30?pm, Ned Deily <n... at acm.org> wrote:
> In article
> <8f6634a2-c977-430a-b9f2-90ef9356d... at x6g2000vbg.googlegroups.com>,
>
> ?seanm... at gmail.com wrote:
> > Thank you for both for the help. I still cannot get the program to run
> > though. Below I've copied my commands and the error messages for you
> > (in IDLE then Terminal):
>
> > IDLE 2.6.2
> > >>> python module1.py
> > SyntaxError: invalid syntax
>
> The default IDLE window is a python shell window. ?That is, you are
> already "inside" the python interpreter, the same as if you typed just
> "python", with no file name, in the Terminal window. ?You can use that
> to execute python statements and introspect objects, among other things. ?
> Try it.
>
> But, back in IDLE, ignore that window for the moment and use the Open
> command in the File Menu to select and open your file module1.py from
> whatever directory it is in. ?A new window should open with the contents
> of that file. ?With that window selected (click on it, if necessary),
> there should be a "Run" option in the Menu bar and under it will be a
> "Run Script" option that will cause the script to run and the output to
> appear in the shell window. ?You can then explore the other options
> available in IDLE for debugging, etc.
>
> --
> ?Ned Deily,
> ?n... at acm.org

Awesome. I think that clears it up (at least enough for now). Thank
you both very much.


From seanm.py at gmail.com  Sat May  2 20:10:14 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Sat, 2 May 2009 17:10:14 -0700 (PDT)
Subject: Most Basic Question Ever - please help
References: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
	<mailman.4994.1241300789.11746.python-list@python.org>
	<0b10f7fd-9b08-40d4-8395-83bdfe860f90@v23g2000pro.googlegroups.com>
Message-ID: <e4119b7f-ce52-4eda-ab18-749245362625@x6g2000vbg.googlegroups.com>

On May 2, 6:25?pm, John Machin <sjmac... at lexicon.net> wrote:
> On May 3, 7:46?am, Dave Angel <da... at ieee.org> wrote:
>
>
>
> > seanm... at gmail.com wrote:
> > > I am going to try posting here again with more detail to see if I can
> > > finally get my first program to work.
>
> > > I am working on a MacBook Pro with OS X 10.4.11. I opened a new window
> > > in IDLE to create a file. The file had only one line of code and was
> > > saved as module1.py. I saved it to Macintosh HD. The one line of code
> > > in the file is copied below:
>
> > > print 'Hello module world!'
>
> > > I closed the file and tried to run it in IDLE and Terminal, but I have
> > > had no success. I'll paste my commands and the error messages below
> > > (for IDLE, then Terminal). Any help would be very much appreciated. I
> > > feel like the marathon just started and I've fallen flat on my face.
> > > Thanks.
>
> > > IDLE 2.6.2
>
> > >>>> python module1.py
>
> > > SyntaxError: invalid syntax
>
> > > sean-m-computer:~ seanm$ python
> > > Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> > > [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> > > Type "help", "copyright", "credits" or "license" for more information.
>
> > >>>> python module1.py
>
> > > ? File "<stdin>", line 1
> > > ? ? python module1.py
> > > ? ? ? ? ? ? ? ? ?^
> > > SyntaxError: invalid syntax
>
> > In both cases, you're already running python. ?Why would you expect to
> > have to run python inside python?
>
> > Once you're at a python prompt (in either of your cases), you use the
> > command "import" to load a module. ?And you do not put the ".py"
> > extension on the parameter. ?Specifically, it should look like this, and
> > very similar for IDLE.
>
> > M:\Programming\Python\sources\temp>c:\ProgFiles\Python26\python.exe
> > Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit
> > (Intel)] on
> > win32
> > Type "help", "copyright", "credits" or "license" for more information.
> > ?>>> import module1
> > Hello module world!
> > ?>>>
>
> Dave, importing modules which have side effects like printing is NOT a
> good habit to which a beginner should be introduced. He needs to know
> how to run a script.
>
> Sean, in Terminal, instead of typing
> ? ? python
> type
> ? ? python module1.py
>
> and I suggest that you give your script (not module) a more meaningful
> name.
>
> HTH,
> John

Great. Thank you both very much. I appreciate the help.


From mark.seagoe at gmail.com  Sat May  2 20:45:29 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Sat, 2 May 2009 17:45:29 -0700 (PDT)
Subject: web access through vpn client
References: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
	<EuOdnVFd2dThB2bUnZ2dnUVZ8gqdnZ2d@bt.com>
	<3b82989a-7e54-461a-b18f-dc90d803c0f9@x29g2000prf.googlegroups.com>
	<TvadnXMrGYqZh2HUnZ2dnUVZ8uydnZ2d@bt.com>
Message-ID: <fa9bad22-f239-447e-88e1-cac01c28a541@d38g2000prn.googlegroups.com>

On May 2, 3:01?am, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> mark.sea... at gmail.com wrote:
> > On May 1, 5:57 pm, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
> > wrote:
> >> mark.sea... at gmail.com wrote:
> >>> Hi;
> >>> I am trying to retrieve financial data off website for stock market
> >>> analysis. ?Just hobby not for pay. ?I actually am impressed that
> >>> urllib2 and BeautifulSoup work pretty well to do what I want, and the
> >>> first little routine actually gets the data from the web page...
> >>> except if my VPN client is turned on.
> >>> I've looked around for a solution but can't find... perhaps I'm not
> >>> entering the right search words. ?I don't even know where to start.
> >>> Can anyone suggest some good reading, or basic idea how to approach?
> >>> Thanks,
> >>> Mark
> >> When the VPN client is on, can you actually still browse the 'classical'
> >> way to the website in question?
> >> I ask this because many cooperate VPN clients have a way of shutting
> >> down all other access besides to the VPN server (which is very annoying
> >> but I can see the logic behind it).
>
> >> If that is the case your VPN network might have a webproxy which needs
> >> to be configured to continue browsing when connected to the VPN. For
> >> python you can automate this by checking for access to the proxy and use
> >> it if it is there.
>
> >> --
> >> MPHhttp://blog.dcuktec.com
>
> > Yes when Cisco AnyConnect VPN client is connected, I can browse w/
> > IE. ?I think the packets get encrypted and possibly go to my company's
> > server and out from there, because then also Outlook connects to my
> > company, Communicator works, etc. ?With VPN off I can browse and
> > Python can get URL, but no connection through my company's server & no
> > encryption.
>
> > Where can I find out more about how to configure the webproxy, if the
> > info is handy? ?Thanks!
>
> > Mark
>
> Most likely your IE gets automatically configured for using a proxy when
> the VPN is made, just check your IE settings ounce you are connected to
> the VPN particular the Connection / LAN-connection settings.
> Or query what is set in the registry at :
> 'HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet
> Settings'
>
> And use the content (if set) as the proxy address in the urllib module.
>
> You might find this module useful for that:http://docs.python.org/library/_winreg.html
>
> --
> MPHhttp://blog.dcuktec.com- Hide quoted text -
>
> - Show quoted text -

Thanks! I'll check it out.


From ebonak at hotmail.com  Sat May  2 21:31:38 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 02 May 2009 21:31:38 -0400
Subject: for with decimal values?
In-Reply-To: <8763gjm5gt.fsf@benfinney.id.au>
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<8763gjm5gt.fsf@benfinney.id.au>
Message-ID: <49FCF3FA.3020401@hotmail.com>

Ben Finney wrote:
> 
> Note that those values are of type ?float?, which is a distinct type
> from ?Decimal? with very different behaviour.
> 
>> If there is such a thing already available, I'd like to use it,
>> otherwise I can write a function to mimic this, but I thought I'd
>> check (my search yielded nothing).
> 
> You can write a function to do it.
> 
> Alternatively, this case seems simple enough that you can write a
> generator expression. Assuming you want ?Decimal? values:
> 
>     >>> from decimal import Decimal
>     >>> amounts = (Decimal(mantissa)/10 for mantissa in range(-105, 105))
>     >>> for amount in amounts:
>     ...     print amount
>     ...


Another nice solution stored away for use!

Thanks,
Esmail



From soumen08 at gmail.com  Sat May  2 21:41:09 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Sun, 3 May 2009 07:11:09 +0530
Subject: Can someone please explain to me this code?
Message-ID: <f6a09c160905021841p27b63c57u33f5c406bb4bbbdf@mail.gmail.com>

Hello,
I was trying to find a method to make global hotkeys with python in
linux. I found this one which uses a library called python-xlib. The
point is that since i dont have much experience with this, i cant
understand some of the code. Can someone please explain to me how this
code works?  According to the author, it is meant to reduce and
increase volume. Im not interested in that specifically. All i want is
to be ale to bind a hotkey to a function in my python program.

from Xlib.display import Display
from Xlib import X
import oss

# custom keys from my dell D400 Laptop
vol_plus  = 176
vol_moins = 174

keys = [vol_plus,vol_moins]

def changeVolume(aValue):
mixer = oss.open_mixer()
symbol = oss.SOUND_DEVICE_LABELS.index('Vol  ')
left,right  = mixer.read_channel(symbol)

avg = (left + right) / 2
if (avg + aValue) >= 0:
mixer.write_channel(symbol,(left + aValue,right + aValue))
mixer.close()

def handle_event(aEvent):
keycode = aEvent.detail
if aEvent.type == X.KeyPress:
if keycode == vol_moins:
changeVolume(-2)
elif keycode == vol_plus:
changeVolume(+2)

def main():
# current display
disp = Display()
root = disp.screen().root

# we tell the X server we want to catch keyPress event
root.change_attributes(event_mask = X.KeyPressMask)

for keycode in keys:
root.grab_key(keycode, X.AnyModifier, 1,X.GrabModeAsync, X.GrabModeAsync)

while 1:
event = root.display.next_event()
handle_event(event)

if __name__ == '__main__':
main()
Regards
Soumen


From gert.cuykens at gmail.com  Sat May  2 21:53:37 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 2 May 2009 18:53:37 -0700 (PDT)
Subject: eval(WsgiApplication)
References: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
	<m2skjn52t0.fsf@googlemail.com>
	<39057d64-921e-4150-a382-ec1d443a383f@j12g2000vbl.googlegroups.com>
	<a4qtc6-poi.ln1@archaeopteryx.softver.org.mk>
Message-ID: <ab21f3ef-60f0-4389-a60d-a5abdef08b76@o20g2000vbh.googlegroups.com>

On May 2, 2:15?pm, ?????? ??????????? <gdam... at gmail.com> wrote:
> >> > How do I do this in python3?
>
> >> What's wrong with importing it?
>
> > The problem is that my wsgi files have a wsgi extention for mod_wsgi
> > use
> ..
> > mod_wsgi has a .wsgi handler because it is recommended to rename the
> > wsgi file with wsgi extensions to avoid double imports
> > cherrypy server has a dispatcher class
>
> You can either use .py extension for the wsgi files OR use a custom
> importer that can import your .wsgi fileshttp://docs.python.org/library/modules.html
>
> --
> ?????? (http://softver.org.mk/damjan/)
>
> Scarlett Johansson: You always see the glass half-empty.
> Woody Allen: No. I see the glass half-full, but of poison.

I stick with the .py files thank you :)


From gert.cuykens at gmail.com  Sat May  2 21:56:12 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 2 May 2009 18:56:12 -0700 (PDT)
Subject: return functions
References: <f6a8cbe2-2078-4e0a-8b52-6437b440d18d@o30g2000vbc.googlegroups.com>
	<2b9deb7a-327d-40b2-8df9-d6db916a6bab@s28g2000vbp.googlegroups.com> 
	<0b04c45d-0152-4498-a331-a19452c29b2f@l28g2000vba.googlegroups.com>
Message-ID: <901b5269-fd69-4664-aae7-4cce91ed1dd9@o14g2000vbo.googlegroups.com>

On May 3, 12:17?am, gert <gert.cuyk... at gmail.com> wrote:
> On May 2, 10:58?pm, gert <gert.cuyk... at gmail.com> wrote:
>
>
>
> > On May 2, 10:44?pm, gert <gert.cuyk... at gmail.com> wrote:
>
> > > Aldo i like the cerrypy wsgi server very much, i do not like the tools
> > > that go with it
> > > so i am stuck with a configuration file that looks like this
>
> > >http://pastebin.com/m4d8184bc
>
> > > After 152 line I finally arrived to a point where i was thinkig "thats
> > > it, this is like going to work on a uni cycle and is just plain
> > > ridicules"
>
> > > So how can i generate some functions something like
>
> > > def generate(url,type): # where type could be htm js css or wsgi
>
> > I was thinking something like this ?
>
> > def static(url, mime):
> > ? ? def application(environ, response):
> > ? ? ? ? f=open(os.path.join(os.path.dirname(__file__), url),'rb')
> > ? ? ? ? l=os.fstat(f.fileno()).st_size
> > ? ? ? ? response('200 OK', [('Content-type', mime+';charset=utf-8'),
> > ('Content-Length', str(l))])
> > ? ? ? ? return FileWrapper(f, 8192)
> > ? ? return application
>
> it works, i reduced it to this :-)
>
> http://code.google.com/p/appwsgi/source/browse/trunk/server.py
>
> any other suggestions to make it smaller and more automatic ?

Wait a minute why am i not using this ?

http://docs.python.org/3.0/library/wsgiref.html#wsgiref.util.request_uri

And just make my own server ?


From ross.jett at gmail.com  Sat May  2 22:13:51 2009
From: ross.jett at gmail.com (Ross)
Date: Sat, 2 May 2009 19:13:51 -0700 (PDT)
Subject: yet another list comprehension question
Message-ID: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>

I'm trying to set up a simple filter using a list comprehension. If I
have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
and I wanted to filter out all tuples containing None, I would like to
get the new list b = [(1,2), (3,4),(6,7)].

I tried b = [i for i in a if t for t in i is not None]   but I get the
error that "t is not defined". What am I doing wrong?


From clp2 at rebertia.com  Sat May  2 22:21:47 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 2 May 2009 19:21:47 -0700
Subject: yet another list comprehension question
In-Reply-To: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
Message-ID: <50697b2c0905021921u4189e2c0n205bdc6a43f1b18d@mail.gmail.com>

On Sat, May 2, 2009 at 7:13 PM, Ross <ross.jett at gmail.com> wrote:
> I'm trying to set up a simple filter using a list comprehension. If I
> have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
> and I wanted to filter out all tuples containing None, I would like to
> get the new list b = [(1,2), (3,4),(6,7)].

b = [tup for tup in a if None not in tup]

Cheers,
Chris
-- 
http://blog.rebertia.com


From ross.jett at gmail.com  Sat May  2 22:23:38 2009
From: ross.jett at gmail.com (Ross)
Date: Sat, 2 May 2009 19:23:38 -0700 (PDT)
Subject: yet another list comprehension question
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
	<mailman.4997.1241317312.11746.python-list@python.org>
Message-ID: <126c59d6-4f6a-4d88-a4a3-d6d8ee03f353@h23g2000vbc.googlegroups.com>

On May 2, 7:21?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Sat, May 2, 2009 at 7:13 PM, Ross <ross.j... at gmail.com> wrote:
> > I'm trying to set up a simple filter using a list comprehension. If I
> > have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
> > and I wanted to filter out all tuples containing None, I would like to
> > get the new list b = [(1,2), (3,4),(6,7)].
>
> b = [tup for tup in a if None not in tup]
>
> Cheers,
> Chris
> --http://blog.rebertia.com

Thanks I feel retarded sometimes.


From debatem1 at gmail.com  Sat May  2 22:25:03 2009
From: debatem1 at gmail.com (CTO)
Date: Sat, 2 May 2009 19:25:03 -0700 (PDT)
Subject: yet another list comprehension question
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
Message-ID: <086ef9ec-da1f-4275-9d48-a62c3a7122af@s1g2000prd.googlegroups.com>

On May 2, 10:13?pm, Ross <ross.j... at gmail.com> wrote:
> I'm trying to set up a simple filter using a list comprehension. If I
> have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
> and I wanted to filter out all tuples containing None, I would like to
> get the new list b = [(1,2), (3,4),(6,7)].

try this:

b = [i for i in a if None not in i]

> I tried b = [i for i in a if t for t in i is not None] ? but I get the
> error that "t is not defined". What am I doing wrong?

You've got a "for" and an "if" backwards. t isn't defined when the if
tries to evaluate it.





From debatem1 at gmail.com  Sat May  2 22:39:33 2009
From: debatem1 at gmail.com (CTO)
Date: Sat, 2 May 2009 19:39:33 -0700 (PDT)
Subject: Can someone please explain to me this code?
References: <mailman.4996.1241314876.11746.python-list@python.org>
Message-ID: <b8f69840-6e90-4e93-81db-163431ec5478@n7g2000prc.googlegroups.com>

On Sat, May 2, 2009 at 9:41 PM, Soumen banerjee <soumen08 at gmail.com>
wrote:

    Hello,
    I was trying to find a method to make global hotkeys with python
in
    linux. I found this one which uses a library called python-xlib.
The
    point is that since i dont have much experience with this, i cant
    understand some of the code. Can someone please explain to me how
this
    code works?  According to the author, it is meant to reduce and
    increase volume. Im not interested in that specifically. All i
want is
    to be ale to bind a hotkey to a function in my python program.


It's not so hard. Just a little confusing at first. The thing is that
X is a
client-server protocol, so it doesn't call a function or anything to
let
you know that the user has pressed a key- it just sends all the events
you've asked for to your application, and lets it handle them how it
will. To get a better idea about how that happens, fire up xev (the
X Event Viewer) on your console.

    from Xlib.display import Display
    from Xlib import X


You still need these


    def handle_event(aEvent):
         keycode = aEvent.detail
         if aEvent.type == X.KeyPress:
             if keycode == vol_moins:
                 changeVolume(-2)
             elif keycode == vol_plus:
                 changeVolume(+2)


(Spacing mine)
You don't really care about this, but the important thing is how
it's structured. It takes an event, then gets its detail attribute,
which is where the key that is pressed will go if it is a keypress,
then sees if its type is KeyPress, then performs the appropriate
action based on that keycode. Your app will do pretty much the
same thing, just with different actions.


    def main():
         # current display
         disp = Display()
         root = disp.screen().root

         # we tell the X server we want to catch keyPress event
         root.change_attributes(event_mask = X.KeyPressMask)

         for keycode in keys:
             root.grab_key(keycode, X.AnyModifier, 1,X.GrabModeAsync,
X.GrabModeAsync)

         while 1:
             event = root.display.next_event()
             handle_event(event)

    if __name__ == '__main__':
    main()


(spacing mine)
While I'd do things a little differently, this is pretty much
boilerplate.
You can use this as a template for what you want to do, assuming
that you've appropriately defined your keycodes and handle_event
function.

Geremy Condra



From apt.shansen at gmail.com  Sat May  2 23:01:55 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sat, 2 May 2009 20:01:55 -0700
Subject: Multiprocessing + Frozen bug?
Message-ID: <7a9c25c20905022001g1cdc7440gfcbe071d007f06b4@mail.gmail.com>

In the multiprocessing.forking module, there's:
    def get_command_line():
        ...

        if getattr(sys, 'frozen', False):
            return [sys.executable, '--multiprocessing-fork']
        else:
            prog = 'from multiprocessing.forking import main; main()'
            return [_python_exe, '-c', prog, '--multiprocessing-fork']

I think that the test there should be "if not getattr(sys, 'frozen',
False):", because if its not frozen then you want to use the sys.executable
-- but if it is, you want to use the one which has been explicitly set. I
think, at least. I'm not quite sure if I want to report it as a bug yet
because I'm very new to multiprocessing and am doing something very
complicated (a windows service using multiprocessing to start various
processes, each of which start arbitrary thirdparty-non-python subprocesses
themselves) so maybe my understanding is wrong.

Or iiis it not?

--S
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From darcy at druid.net  Sat May  2 23:20:25 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sun, 3 May 2009 03:20:25 +0000
Subject: problem with money datatype based calculations in python
In-Reply-To: <1241289437.3842.6.camel@kk-laptop>
References: <mailman.4963.1241250341.11746.python-list@python.org>
	<r8vtc6-vh1.ln1@spamfence.net>
	<20090502115734.b280bf35.darcy@druid.net>
	<1241289437.3842.6.camel@kk-laptop>
Message-ID: <20090503032025.06428836.darcy@druid.net>

On Sun, 03 May 2009 00:07:17 +0530
Krishnakant <krmane at gmail.com> wrote:
> On Sat, 2009-05-02 at 11:57 -0400, D'Arcy J.M. Cain wrote:
> > And if you use PyGreSQL (http://www.PyGreSQL.org/) to connect to
> > the database then the money type is already converted to Decimal.
> > d'arcy, I visited the home page for pygresql and discovered that you wrote the library.

Sorry, I should have mentioned my bias.  :-)

> I am happy that you also included a non-dbapi (postgresql classic
> interface ) along with the standard DBAPI module.

That interface existed before there was a DB-API spec.  We added the
DB-API interface later and decided to support both.

> I would like to know if it has been tested with postgresql 8.3 and are

The current version of PyGreSQL has been tested with Python 2.5 and
PostGreSQL 8.3. Older version should work as well, but you will need
at least Python 2.3 and PostgreSQL 7.4.

> there any known bottlenecks while using this driver module on large
> scale database opperations?

None that I know of.  It is used on some pretty big databases that I
know of.

> Is this actively maintained?

Yes.

I'll leave the rest of the questions for someone less biased.  :-)

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From soumen08 at gmail.com  Sat May  2 23:43:32 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Sun, 3 May 2009 09:13:32 +0530
Subject: Can someone please explain to me this code?
In-Reply-To: <b8f69840-6e90-4e93-81db-163431ec5478@n7g2000prc.googlegroups.com>
References: <mailman.4996.1241314876.11746.python-list@python.org>
	<b8f69840-6e90-4e93-81db-163431ec5478@n7g2000prc.googlegroups.com>
Message-ID: <f6a09c160905022043s74cf17f0u37027da633c0a23@mail.gmail.com>

Hello,
I'd like a little more help with the following lines:
				
root.change_attributes(event_mask = X.KeyPressMask)

        for keycode in keys:
            root.grab_key(keycode, X.AnyModifier, 1,X.GrabModeAsync,
X.GrabModeAsync)

what exactly do they do?
regards
Soumen


From debatem1 at gmail.com  Sun May  3 00:03:48 2009
From: debatem1 at gmail.com (CTO)
Date: Sat, 2 May 2009 21:03:48 -0700 (PDT)
Subject: Can someone please explain to me this code?
References: <mailman.4996.1241314876.11746.python-list@python.org> 
	<b8f69840-6e90-4e93-81db-163431ec5478@n7g2000prc.googlegroups.com> 
	<mailman.5000.1241322217.11746.python-list@python.org>
Message-ID: <a2c042a9-bc65-40ec-8bca-4003f1541686@m24g2000vbp.googlegroups.com>

> root.change_attributes(event_mask = X.KeyPressMask)

This asks X to send this application keypress events

> root.grab_key(keycode, X.AnyModifier, 1,X.GrabModeAsync, X.GrabModeAsync)

This tells X to grab the keyboard if the given keycode is generated
and
any modifier is pressed, not to stop processing keyboard events, and
not
to stop processing pointer events. That's pretty safe, although I'm
not
sure if you'd need the modifier for your application.



From cmpython at gmail.com  Sun May  3 00:22:09 2009
From: cmpython at gmail.com (CM)
Date: Sat, 2 May 2009 21:22:09 -0700 (PDT)
Subject: Most Basic Question Ever - please help
References: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
Message-ID: <7c328de7-ed20-450c-819f-7689e73f6a6c@g19g2000vbi.googlegroups.com>

On May 2, 4:36?pm, seanm... at gmail.com wrote:
> I am going to try posting here again with more detail to see if I can
> finally get my first program to work.
>
> I am working on a MacBook Pro with OS X 10.4.11. I opened a new window
> in IDLE to create a file. The file had only one line of code and was
> saved as module1.py. I saved it to Macintosh HD. The one line of code
> in the file is copied below:
>
> print 'Hello module world!'
>
> I closed the file and tried to run it in IDLE and Terminal, but I have
> had no success. I'll paste my commands and the error messages below
> (for IDLE, then Terminal). Any help would be very much appreciated. I
> feel like the marathon just started and I've fallen flat on my face.
> Thanks.
>
> IDLE 2.6.2>>> python module1.py
>
> SyntaxError: invalid syntax
>
> sean-m-computer:~ seanm$ python
> Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.>>> python module1.py
>
> ? File "<stdin>", line 1
> ? ? python module1.py
> ? ? ? ? ? ? ? ? ?^
> SyntaxError: invalid syntax

Sean, also, keep in mind you can use IDLE to run
your scripts.  After you have saved a script/program,
there is an option for Run in the menu, and then under
that, Run Module.  The output of the script will be
sent to IDLE window indicated as the Python shell.
You can also just test code directly from within
that shell, though for multi-line programs, it is
easier within the composing window.

I suggest you sign up for the Python tutor list:
http://mail.python.org/mailman/listinfo/tutor

And you can search through their big archive of
questions and answers here:
http://www.nabble.com/Python---tutor-f2981.html

The tutors there are great and super-helpful, and
will field any level of question but are particularly
good for absolute beginners.

Here is a tutorial on using IDLE:
http://hkn.eecs.berkeley.edu/~dyoo/python/idle_intro/index.html

And here is a very good general programming tutorial online
book, focusing on Python:
http://www.freenetpages.co.uk/hp/alan.gauld/

Good luck!
Che


From Kevin.Smith at sas.com  Sun May  3 00:36:26 2009
From: Kevin.Smith at sas.com (Kevin D. Smith)
Date: Sat, 2 May 2009 23:36:26 -0500
Subject: Doc strings in descriptors
Message-ID: <gtj70a$h7d$1@foggy.unx.sas.com>

I have a simple descriptor to create a cached property as shown below.

class cproperty(object):
    """ Property whose value is only calculated once and cached """
    def __init__(self, func):
        self._func = func
        self.__doc__ = func.__doc__
    def __get__(self, obj, type=None):
        if obj is None:
            return self
        try:
            return getattr(obj, '@%s' % self._func.func_name)
        except AttributeError:
            result = self._func(obj)
            setattr(obj, '@%s' % self._func.func_name, result)
            return result

The problem is that when I use the help() function on them, I don't get 
the doc string from the function that is being wrapped.  Instead, I get 
the following:

    hasEmployees = <StudioManager.utils.cproperty object at 0xf126f0>

What do I need to do to get the doc string of the wrapped function to 
apper when using help()?

-- 
Kevin D. Smith



From Graham.Dumpleton at gmail.com  Sun May  3 00:58:21 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Sat, 2 May 2009 21:58:21 -0700 (PDT)
Subject: eval(WsgiApplication)
References: <8357032b-5fc0-4d4c-843a-a1ea27c62e5c@o14g2000vbo.googlegroups.com>
	<m2skjn52t0.fsf@googlemail.com>
	<39057d64-921e-4150-a382-ec1d443a383f@j12g2000vbl.googlegroups.com>
	<a4qtc6-poi.ln1@archaeopteryx.softver.org.mk>
Message-ID: <8dfeb7b5-1a06-44c6-b9be-581093d89d8e@d19g2000prh.googlegroups.com>

On May 2, 10:15?pm, ?????? ??????????? <gdam... at gmail.com> wrote:
> >> > How do I do this in python3?
>
> >> What's wrong with importing it?
>
> > The problem is that my wsgi files have a wsgi extention for mod_wsgi
> > use
> ..
> > mod_wsgi has a .wsgi handler because it is recommended to rename the
> > wsgi file with wsgi extensions to avoid double imports
> > cherrypy server has a dispatcher class
>
> You can either use .py extension for the wsgi files OR use a custom
> importer that can import your .wsgi fileshttp://docs.python.org/library/modules.html

You don't have to go to such an extreme if it is only for one file to
be used as root WSGI application. Can use something like:

  def load_script(filename, label='__wsgi__'):
    module = imp.new_module(label)
    module.__file__ = filename
    execfile(filename, module.__dict__)
    return module

  module = load_script('/some/path/file.wsgi')

  application = module.application

Graham


From Graham.Dumpleton at gmail.com  Sun May  3 01:33:23 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Sat, 2 May 2009 22:33:23 -0700 (PDT)
Subject: return functions
References: <f6a8cbe2-2078-4e0a-8b52-6437b440d18d@o30g2000vbc.googlegroups.com>
Message-ID: <5dde50ab-c47d-471a-a8cb-3824387f42c5@x1g2000prh.googlegroups.com>

On May 3, 6:44?am, gert <gert.cuyk... at gmail.com> wrote:
> Aldo i like the cerrypywsgiserver very much, i do not like the tools
> that go with it
> so i am stuck with a configuration file that looks like this
>
> http://pastebin.com/m4d8184bc
>
> After 152 line I finally arrived to a point where i was thinkig "thats
> it, this is like going to work on a uni cycle and is just plain
> ridicules"
>
> So how can i generate some functions something like
>
> def generate(url,type): # where type could be htm js css orwsgi

You seem to have finally discovered that when using Apache/mod_wsgi,
Apache does a level of URL matching to filesystem based resources.
This isn't automatic in normal WSGI servers unless you use a WSGI
middleware that does the mapping for you. :-)

Graham


From stefan_ml at behnel.de  Sun May  3 02:25:33 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sun, 03 May 2009 08:25:33 +0200
Subject: eric not working on ubuntu 9.04
In-Reply-To: <mailman.4989.1241296969.11746.python-list@python.org>
References: <mailman.4989.1241296969.11746.python-list@python.org>
Message-ID: <49fd38dd$0$31333$9b4e6d93@newsspool4.arcor-online.net>

bvidinli wrote:
> An unhandled exception occurred. Please report the problem
> using the error reporting dialog or via email to <eric4-bugs at die-offenbachs.de>.
> A log has been written to "/home/bvidinli/.eric4/eric4_error.log".

Did you try that?

Stefan


From jhmsmits at gmail.com  Sun May  3 03:06:37 2009
From: jhmsmits at gmail.com (SanPy)
Date: Sun, 3 May 2009 00:06:37 -0700 (PDT)
Subject: writing consecutive data to subprocess command 'more'
References: <b2ea7665-4a7e-4563-91ac-5d899e7903a3@t10g2000vbg.googlegroups.com>
	<mailman.4988.1241296526.11746.python-list@python.org>
	<c9776d62-5d87-4f6c-b002-3690c6e21e87@t11g2000vbc.googlegroups.com>
Message-ID: <427b5e4e-4754-48d1-985a-809ff2328ca0@b1g2000vbc.googlegroups.com>

Hmm, it works as long as the pager command is available on the system.
I created a test file to explain what I mean. You can find it here:
http://gist.github.com/105880

The 'pager' command is on purpose a command that is not available on
the system.
It should fall back to sys.stdout in the write method. However, it
does not show any output at all.
Strangely enough, when a put a time.sleep(1) between the first and
second printer.write statements, the second and third statement do
appear.
Btw, the normal pager command works fine on my system.
How can I solve this, so that the fallback sys.stdout does show
output?
---
Sander

On 2 mei, 23:00, SanPy <jhmsm... at gmail.com> wrote:
> Thanks, that works beautifully!
>
> Regards,
> Sander
>
> On 2 mei, 22:35, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
>
> > communicate writes to the child's stdin and waits for it to finish. If you ?
> > want to keep writing, don't use communicate. And you'll need to keep state ?
> > ?from one call to another, so use a class. Based on the code above, create ?
> > a class Pager with __init__, write and close methods:
>
> > class Pager:
> > ? def __init__(self):
> > ? ?# copy the logic above
> > ? ?self.proc = subprocess.Popen(...)
> > ? ?self.file = self.proc.stdin
> > ? ?# if something goes wrong, set self.proc=None and self.file=sys.stdout
>
> > ? def write(self, text):
> > ? ?self.file.write(text)
>
> > ? def close(self):
> > ? ?if self.proc:
> > ? ? self.file.close()
> > ? ? self.proc.wait()
>
> > Also, take a look at the pager function in the pydoc module (see the ?
> > source) - it handles several cases.
>
> > --
> > Gabriel Genellina



From mabdelkader at gmail.com  Sun May  3 03:07:41 2009
From: mabdelkader at gmail.com (ma)
Date: Sun, 3 May 2009 03:07:41 -0400
Subject: yet another list comprehension question
In-Reply-To: <086ef9ec-da1f-4275-9d48-a62c3a7122af@s1g2000prd.googlegroups.com>
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
	<086ef9ec-da1f-4275-9d48-a62c3a7122af@s1g2000prd.googlegroups.com>
Message-ID: <148918f0905030007l3fc7280co8bc4c46a56c7e52f@mail.gmail.com>

This isn't list comprehension, but it's something to keep in mind:
b = filter(lambda x: None not in x, input_list)


On Sat, May 2, 2009 at 10:25 PM, CTO <debatem1 at gmail.com> wrote:

> On May 2, 10:13 pm, Ross <ross.j... at gmail.com> wrote:
> > I'm trying to set up a simple filter using a list comprehension. If I
> > have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
> > and I wanted to filter out all tuples containing None, I would like to
> > get the new list b = [(1,2), (3,4),(6,7)].
>
> try this:
>
> b = [i for i in a if None not in i]
>
> > I tried b = [i for i in a if t for t in i is not None]   but I get the
> > error that "t is not defined". What am I doing wrong?
>
> You've got a "for" and an "if" backwards. t isn't defined when the if
> tries to evaluate it.
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 03:13:40 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 07:13:40 GMT
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<bd847bb3-e52a-4755-8bc2-a795abfc92fc@o14g2000vbo.googlegroups.com>
Message-ID: <00191e5c$0$9761$c3e8da3@news.astraweb.com>

On Sat, 02 May 2009 11:01:39 -0700, bearophileHUGS wrote:

> Esmail:
>> Is there a Python construct to allow me to do something like this:
>> ? ? for i in range(-10.5, 10.5, 0.1):
> 
> Sometimes I use an improved version of this:
> http://code.activestate.com/recipes/66472/


Care to contribute your improvements back to the recipe? Or at least 
here? I for one am curious to see how you do it.


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 03:21:06 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 07:21:06 GMT
Subject: Doc strings in descriptors
References: <gtj70a$h7d$1@foggy.unx.sas.com>
Message-ID: <00192019$0$9761$c3e8da3@news.astraweb.com>

On Sat, 02 May 2009 23:36:26 -0500, Kevin D. Smith wrote:

> I have a simple descriptor to create a cached property as shown below.
...
> What do I need to do to get the doc string of the wrapped function to
> apper when using help()?

Call it on the class, not the instance:


>>> class Test(object):
...     def getx(self): return "spam"
...     def setx(self, value): return None  # and do nothing
...     x = property(getx, setx, None, "This is my docstring")
...
>>> t = Test()
>>> t.x.__doc__  # like "spam".__doc__
'str(object) -> string\n\nReturn a nice string representation of the 
object.\nIf the argument is a string, the return value is the same 
object.'
>>> Test.x.__doc__
'This is my docstring'



-- 
Steven


From dusan.smitran at gmail.com  Sun May  3 03:25:32 2009
From: dusan.smitran at gmail.com (dusans)
Date: Sun, 3 May 2009 00:25:32 -0700 (PDT)
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org> 
	<bd847bb3-e52a-4755-8bc2-a795abfc92fc@o14g2000vbo.googlegroups.com> 
	<00191e5c$0$9761$c3e8da3@news.astraweb.com>
Message-ID: <2400dc46-f1f6-4621-b478-762557effa9e@z19g2000vbz.googlegroups.com>

>>> import numpy as np
>>> for i in np.arange(-10.5, 10.5, 0.1):
...     print i
...
-10.5
-10.4
-10.3
-10.2


From debatem1 at gmail.com  Sun May  3 03:34:08 2009
From: debatem1 at gmail.com (CTO)
Date: Sun, 3 May 2009 00:34:08 -0700 (PDT)
Subject: eric not working on ubuntu 9.04
References: <mailman.4989.1241296969.11746.python-list@python.org>
Message-ID: <6cf276e7-70c8-4653-8dde-aa6cad85c538@q14g2000vbn.googlegroups.com>

> ? File "/usr/lib/python2.6/email/message.py", line 790, in Message
> ? ? from email.Iterators import walk

Well, the module is called email.iterators (rather than
email.Iterators),
for starters. It looks like __all__ exports both names (which seems a
little dodgy to me, but hey, y'all are the experts) but Ubuntu messes
with Python a lot before it makes it to a package. I don't have a
jaunty
box handy, but my guess is that some heinous confluence of
email.iterators.walk moving to Message.walk() in python 3, the module
email.Iterators not existing anymore, and Ubuntu messing with Python
has caused the whole house of cards to come crashing down. If I were
you, I'd probably do the following:

1) file a ubuntu bug report
2) see if you can fire up the interpreter and see if the following
works:

>>> from email.Iterators import walk

If not, try it with the 'i' lowercased. If that works, you've got your
culprit. Otherwise, let me know and I'll take a look at it when I get
back in front of my jaunty box.

Geremy Condra


From __peter__ at web.de  Sun May  3 03:54:44 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 03 May 2009 09:54:44 +0200
Subject: eric not working on ubuntu 9.04
References: <mailman.4989.1241296969.11746.python-list@python.org>
Message-ID: <gtjik5$de6$02$1@news.t-online.com>

bvidinli wrote:

> any idea ?

It works on my Kubuntu 9.04, but I can provoke a similar error with

$ export PYTHONPATH=`pwd`
$ touch email.py
$ eric

As a first step I recommend that you make sure that eric doesn't 
accidentally import modules written by you. 

Peter



From aleksandar27 at brisiovonet.hr  Sun May  3 04:33:43 2009
From: aleksandar27 at brisiovonet.hr (alejandro)
Date: Sun, 3 May 2009 10:33:43 +0200
Subject: stuck with PyOBEX
References: <gt78o7$i9n$1@ss408.t-com.hr> <75opebF19fc22U1@mid.uni-berlin.de>
	<gt80qd$mbf$1@get-news01.get.basefarm.net>
	<gt8pbj$j3o$1@ss408.t-com.hr>
	<gtatk5$pff$1@get-news01.get.basefarm.net>
	<gthe40$87q$1@ss408.t-com.hr>
	<gthm2m$sdr$1@get-news01.get.basefarm.net>
Message-ID: <gtjktg$ai0$1@ss408.t-com.hr>

Yes!

> I haven't tried to run it under Windows. I just assumed that 
> BluetoothSocket
> would have the same API on both Linux and Windows.
>
> Looking around, it seems that this is something we can work around:
>
> http://svn.navi.cx/misc/trunk/laserprop/client/BluetoothConduit.py
>
> I'll send you an updated version to try if you would like to test it.
>
> David 




From bruce306 at rogers.com  Sun May  3 06:43:27 2009
From: bruce306 at rogers.com (Uncle Bruce)
Date: Sun, 3 May 2009 03:43:27 -0700 (PDT)
Subject: Use of Unicode in Python 2.5 source code literals
Message-ID: <0658da84-6bcf-4689-8a5a-4b934202af08@t10g2000vbg.googlegroups.com>

I'm working with Python 2.5.4 and the NLTK (Natural Language
Toolkit).  I'm an experienced programmer, but new to Python.

This question arose when I tried to create a literal in my source code
for a Unicode codepoint greater than 255.  (I also posted this
question in the NLTK discussion group).

The Python HELP (at least for version 2.5.4) states:

+++++++
Python supports writing Unicode literals in any encoding, but you have
to declare the encoding being used. This is done by including a
special comment as either the first or second line of the source file:

#!/usr/bin/env python
# -*- coding: latin-1 -*-
++++++++++++

Based on some experimenting I've done, I suspect that the support for
Unicode literals in ANY encoding isn't really accurate.  What seems to
happen is that there must be an 8-bit mapping between the set of
Unicode literals and what can be used as literals.

Even when I set Options / General / Default Source Encoding to UTF-8,
IDLE won't allow Unicode literals (e.g. characters copied and pasted
from the Windows Character Map program) to be used, even in a quoted
string, if they represent an ord value greater than 255.

I noticed, in researching this question, that Marc Andre Lemburg
stated, back in 2001, "Since Python source code is defined to be
ASCII..."

I'm writing code for linguistics (other than English), so I need
access to lots more characters.  Most of the time, the characters come
from files, so no problem.  But for some processing tasks, I simply
must be able to use "real" Unicode literals in the source code.
(Writing hex escape sequences in a complex regex would be a
nightmare).

Was this taken care of in the switch from Python 2.X to 3.X?

Is there a way to use more than 255 Unicode characters in source code
literals in Python 2.5.4?

Also, in the Windows version of Python, how can I tell if it was
compiled to support 16 bits of Unicode or 32 bits of Unicode?

Bruce in Toronto


From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 07:32:39 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 11:32:39 GMT
Subject: Use of Unicode in Python 2.5 source code literals
References: <0658da84-6bcf-4689-8a5a-4b934202af08@t10g2000vbg.googlegroups.com>
Message-ID: <00195b0e$0$9761$c3e8da3@news.astraweb.com>

On Sun, 03 May 2009 03:43:27 -0700, Uncle Bruce wrote:

> Based on some experimenting I've done, I suspect that the support for
> Unicode literals in ANY encoding isn't really accurate.  What seems to
> happen is that there must be an 8-bit mapping between the set of Unicode
> literals and what can be used as literals.
> 
> Even when I set Options / General / Default Source Encoding to UTF-8,
> IDLE won't allow Unicode literals (e.g. characters copied and pasted
> from the Windows Character Map program) to be used, even in a quoted
> string, if they represent an ord value greater than 255.

When you say it "won't allow", what do you mean? That you can't paste 
them into the document? Does it give an error? An exception at compile 
time or runtime?

I assume you have included the coding line at the top of the file. Make 
sure it says utf-8 and not latin-1.
 
# -*- coding: uft-8 -*-

This is especially important if you use a Windows text editor that puts a 
Unicode BOM at the start of the file.

What happens if you use a different editor to insert the characters in 
the file, and then open it in IDLE?

How are you writing the literals? As byte strings or unicode strings? E.g.

# filename = nonascii.py
theta = '?'  # byte string, probably will lead to problems
sigma = u'?'  # unicode, this is the Right Way



> Is there a way to use more than 255 Unicode characters in source code
> literals in Python 2.5.4?

It works for me in Python 2.4 and 2.5, although I'm not using IDLE.

>>> import nonascii
>>> nonascii.sigma
>>> print nonascii.sigma
?
>>> print nonascii.theta
?

Perhaps it is a problem with IDLE?



-- 
Steven


From mnordhoff at mattnordhoff.com  Sun May  3 07:37:35 2009
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Sun, 03 May 2009 11:37:35 +0000
Subject: Use of Unicode in Python 2.5 source code literals
In-Reply-To: <0658da84-6bcf-4689-8a5a-4b934202af08@t10g2000vbg.googlegroups.com>
References: <0658da84-6bcf-4689-8a5a-4b934202af08@t10g2000vbg.googlegroups.com>
Message-ID: <49FD81FF.1060207@mattnordhoff.com>

Uncle Bruce wrote:
> I'm working with Python 2.5.4 and the NLTK (Natural Language
> Toolkit).  I'm an experienced programmer, but new to Python.
> 
> This question arose when I tried to create a literal in my source code
> for a Unicode codepoint greater than 255.  (I also posted this
> question in the NLTK discussion group).
> 
> The Python HELP (at least for version 2.5.4) states:
> 
> +++++++
> Python supports writing Unicode literals in any encoding, but you have
> to declare the encoding being used. This is done by including a
> special comment as either the first or second line of the source file:
> 
> #!/usr/bin/env python
> # -*- coding: latin-1 -*-
> ++++++++++++
> 
> Based on some experimenting I've done, I suspect that the support for
> Unicode literals in ANY encoding isn't really accurate.  What seems to
> happen is that there must be an 8-bit mapping between the set of
> Unicode literals and what can be used as literals.
> 
> Even when I set Options / General / Default Source Encoding to UTF-8,
> IDLE won't allow Unicode literals (e.g. characters copied and pasted
> from the Windows Character Map program) to be used, even in a quoted
> string, if they represent an ord value greater than 255.
> 
> I noticed, in researching this question, that Marc Andre Lemburg
> stated, back in 2001, "Since Python source code is defined to be
> ASCII..."
> 
> I'm writing code for linguistics (other than English), so I need
> access to lots more characters.  Most of the time, the characters come
> from files, so no problem.  But for some processing tasks, I simply
> must be able to use "real" Unicode literals in the source code.
> (Writing hex escape sequences in a complex regex would be a
> nightmare).
> 
> Was this taken care of in the switch from Python 2.X to 3.X?
> 
> Is there a way to use more than 255 Unicode characters in source code
> literals in Python 2.5.4?
> 
> Also, in the Windows version of Python, how can I tell if it was
> compiled to support 16 bits of Unicode or 32 bits of Unicode?
> 
> Bruce in Toronto

Works for me:

--- snip ---
$ cat snowman.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-

import unicodedata

snowman = u'?'

print len(snowman)
print unicodedata.name(snowman)
$ python2.6 snowman.py
1
SNOWMAN
--- snip ---

What did you set the encoding to in the declaration at the top of the
file? The help text you quoted uses latin-1 as an example, an encoding
which, of course, only supports 256 code points. Did you try utf-8 instead?

The regular expression engine's Unicode support is a different question,
and I do not know the answer.

By the way, Python 2.x only supports using non-ASCII characters in
source code in string literals. Python 3 adds support for Unicode
identifiers (e.g. variable names, function argument names, etc.).
-- 


From runarte at start.no  Sun May  3 07:53:46 2009
From: runarte at start.no (Runar Tenfjord)
Date: Sun, 3 May 2009 11:53:46 +0000 (UTC)
Subject: ANN: pyscite
Message-ID: <loom.20090503T114741-303@post.gmane.org>

ANN: pyscite released

Download it from:
http://code.google.com/p/pyscite/

What is pyscite?

Pyscite is a python module for accessing the SciTE editors Director Interface
on windows.

Example are included with code to integrate the aspell spell checker engine
with SciTE.




From flamz3d at gmail.com  Sun May  3 09:08:02 2009
From: flamz3d at gmail.com (flamz3d at gmail.com)
Date: Sun, 3 May 2009 06:08:02 -0700 (PDT)
Subject: AutoComplete in C++ Editor for Python
Message-ID: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>

Hello,
I am embedding python support in my C++ application and was looking at
adding "Intellisense" or "AutoComplete" support.

I found a way to do it using the "dir" function, but this creates a
problem. Here's why. Let's say I have the following code in my editor:

import sys
x = sys


Now, I would like to get all attributes of the object called 'x'. I
can "instrument" the code and add "print dir(x)" at the end,
temporarily redirect the python output to a string and execute the
code.

But this is not safe: I do NOT want to execute the code while the user
is typing!

Is there a way to "compile" the python code and get access to the
symbol table from that compiled block?

Did anybody ever implement AutoComplete in a editor for Python?

cheers.


From mike.blonder at gmail.com  Sun May  3 09:21:29 2009
From: mike.blonder at gmail.com (mikefromvt)
Date: Sun, 3 May 2009 06:21:29 -0700 (PDT)
Subject: Need Help with str.replace & tuples
References: <90983bf0-c21d-44f5-91c1-873c484678b9@s16g2000vbp.googlegroups.com>
	<f1ad962b-5777-46cb-8f96-277ea51aba3c@t10g2000vbg.googlegroups.com>
Message-ID: <05b72ff3-305d-4c96-bfb6-51f65ab26c43@q2g2000vbr.googlegroups.com>

On May 2, 6:22?pm, bearophileH... at lycos.com wrote:
> mikefromvt:> I am very very unfamiliar with Python and need to update a Python
> > script. ?What I need to do is to replace three variables (already
> > defined in the script) within a string. ?The present script correctly
> > replaces two of the three variables. ?I am unable to add a third
> > variable. ?Specifically, I would like to add
>
> > "panoble",panoble
> > to the following code:
> > idxItemStr+=string.replace(string.replace
>
> (idxItemTplStr,"stylenumber",stylenumber),"formalname",formalname)
>
> This isn't going to win some contest of coding style quality, but you
> may try this (for other people: I have not added any new variable name
> on purpose):
>
> idxItemStr += idxItemTplStr.replace("stylenumber",
> ? ? ? ? ? ? ? stylenumber).replace("formalname",
> ? ? ? ? ? ? ? formalname).replace("panoble", panoble)
>
> Note that in Python names are usually written like this:
> idx_item_tpl
> Instead of:
> idxItemTplStr
>
> Bye,
> bearophile

Thank you SO MUCH. It works perfectly.

Mike


From riccardo.f at email.it  Sun May  3 10:05:42 2009
From: riccardo.f at email.it (Riccardo Fadiga)
Date: Sun, 3 May 2009 16:05:42 +0200
Subject: New Module Proposal
Message-ID: <001c01c9cbf8$3fc39500$bf4abf00$@f@email.it>

Greetings,

I'm a basic python coder, and I wrote for myself a module wich has many
function regarding encryption/decryption with Caesar, Vigenere, RSA and many
more ciphers. People told me that it would be useful that it would be
included in stardard Python distribution. I'll send you a copy of the file,
just in case you decide to really do that.

Thanks for reading. Please write back.

 

Riccardo

 


 
 
 --
 Caselle da 1GB, trasmetti allegati fino a 3GB e in piu' IMAP, POP3 e SMTP autenticato? GRATIS solo con Email.it http://www.email.it/f
 
 Sponsor:
 Posta Elettronica Certificata con valore legale e notifica via SMS: scopri legal.email.it
 Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=8977&d=3-5
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From bruce306 at rogers.com  Sun May  3 10:26:59 2009
From: bruce306 at rogers.com (Uncle Bruce)
Date: Sun, 3 May 2009 07:26:59 -0700 (PDT)
Subject: Use of Unicode in Python 2.5 source code literals
References: <0658da84-6bcf-4689-8a5a-4b934202af08@t10g2000vbg.googlegroups.com>
	<mailman.5003.1241350672.11746.python-list@python.org>
Message-ID: <197f510f-2b7b-42b9-b5b1-14e5a71700cb@o14g2000vbo.googlegroups.com>

On May 3, 7:37?am, Matt Nordhoff <mnordh... at mattnordhoff.com> wrote:
> Uncle Bruce wrote:
<snip>
> --

I think I've figured it out!

What I was trying to do was to enter the literal strings directly into
the IDLE interpreter.  The IDLE interpreter will not accept high
codepoints directly.

However, when I put a defined function in a separate file with high
codepoints, IDLE processes them just fine!  display produced the
expected Hex strings, and Print displayed the correct characters.

Success!


From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 10:42:04 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 14:42:04 GMT
Subject: Strange interaction between timeit and recursion
Message-ID: <00198774$0$9761$c3e8da3@news.astraweb.com>

I'm seeing a strange interaction between timeit and recursion.


>>> sys.getrecursionlimit()
1000
>>> from timeit import Timer
>>> setup = """def test(n=1):
...     if n < 999: return test(n+1)
...     return None
... """
>>> exec setup
>>> test() is None
True
>>>
>>> Timer('test()', setup).repeat(number=1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/timeit.py", line 188, in repeat
    t = self.timeit(number)
  File "/usr/lib/python2.5/timeit.py", line 161, in timeit
    timing = self.inner(it, self.timer)
  File "<timeit-src>", line 9, in inner
  File "<timeit-src>", line 4, in test
  File "<timeit-src>", line 4, in test
  File "<timeit-src>", line 4, in test
  ...
  File "<timeit-src>", line 4, in test



I don't understand why my recursive function hits the recursion limit 
inside the timeit.Timer when it works outside of it.

Is there any way to see the current recursion depth at a particular 
moment?



-- 
Steven


From rose.0978 at gmail.com  Sun May  3 10:49:49 2009
From: rose.0978 at gmail.com (rose)
Date: Sun, 3 May 2009 07:49:49 -0700 (PDT)
Subject: Using Help inside Python
Message-ID: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>

Hi,
            I have an idea of the basics of programming language in
general. How to access help in python i.e. help followed by something
or to get to know about some inbuilt module or method etc. how do I
access help from within the IDLE using the help command.

Thank You.


From krmane at gmail.com  Sun May  3 11:14:29 2009
From: krmane at gmail.com (Krishnakant)
Date: Sun, 03 May 2009 20:44:29 +0530
Subject: problem with money datatype based calculations in python
In-Reply-To: <20090503032025.06428836.darcy@druid.net>
References: <mailman.4963.1241250341.11746.python-list@python.org>
	<r8vtc6-vh1.ln1@spamfence.net>
	<20090502115734.b280bf35.darcy@druid.net>
	<1241289437.3842.6.camel@kk-laptop>
	<20090503032025.06428836.darcy@druid.net>
Message-ID: <1241363669.3724.10.camel@kk-laptop>

On Sun, 2009-05-03 at 03:20 +0000, D'Arcy J.M. Cain wrote:
> Sorry, I should have mentioned my bias.  :-)
> No problems at all.  It is a very good library.  I get an impression that it is realy a mature module and a very powerful set of API. 

> > I would like to know if it has been tested with postgresql 8.3 and are
> 
> The current version of PyGreSQL has been tested with Python 2.5 and
> PostGreSQL 8.3. Older version should work as well, but you will need
> at least Python 2.3 and PostgreSQL 7.4.
> 
Ah, I am using python 2.6 and postgresql 8.3

I am really impressed with the library.  I want some manual or tutorial
for the same and if possible can you write me off the list with a small
tutorial for things like connecting to the database, sending queries,
and working with the resultset at the client site.

I will be really happy if this library also supports calling a stored
procedurs directly.  Psycopg2 does not have such a feature and I had to
create one small module which does that work.

What it does is that you just give the name of the procuedure procedure
as the first parameter and a list of arguements as the second parameter.
That's all, you will get the result because the query  for the call is
created inside the module and the programmer need not worry about what
the sored procedure looks like.

Never the less I am expecting that pygresql has some infrastructure for
making calls to the stored procedures.  Please send me some tutorial off
the list.

happy hacking.
Krishnakant.




From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 11:15:25 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 15:15:25 GMT
Subject: Using Help inside Python
References: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>
Message-ID: <00198f45$0$9761$c3e8da3@news.astraweb.com>

On Sun, 03 May 2009 07:49:49 -0700, rose wrote:

> Hi,
>             I have an idea of the basics of programming language in
> general. How to access help in python i.e. help followed by something or
> to get to know about some inbuilt module or method etc. how do I access
> help from within the IDLE using the help command.
> 
> Thank You.

At the prompt, type any of:

help()

help(module)

help(function)

help(any_object)

help("keyword")  # note the quotes around the keyword

then hit Enter to get help about that object or keyword.


-- 
Steven


From icebergwtf at gmail.com  Sun May  3 11:18:33 2009
From: icebergwtf at gmail.com (tiefeng wu)
Date: Sun, 3 May 2009 23:18:33 +0800
Subject: smtplib send email by using gmail smtp server
Message-ID: <4314c1f70905030818y73809e16s45e04f8edb5ce714@mail.gmail.com>

Hi all

I'm tring send email using smtp.gmail.com

here's the code:

*s = SMTP('**smtp.gmail.com* <http://smtp.gmail.com/>*', 25)
s.set_debuglevel(1)*
*s.ehlo()
s.starttls()
s.ehlo()
s.login(mygmailaccount, mygmailpassword)
s.sendmail(from_addr, to_addr_list, message)
s.close()*

I got the following:

*send: 'ehlo [192.168.1.104]\r\n'
reply: b'**250-mx.google.com* <http://250-mx.google.com/>* at your service,
[58.39.112.163]\r\n'
reply: b'250-SIZE 35651584\r\n'
reply: b'250-8BITMIME\r\n'
reply: b'250-STARTTLS\r\n'
reply: b'250-ENHANCEDSTATUSCODES\r\n'
reply: b'250 PIPELINING\r\n'
reply: retcode (250); Msg: b'**mx.google.com* <http://mx.google.com/>* at
your service, [58.39.112.163]\nSIZE 35651584\n8BITMIME\nSTARTTLS\nENHANCED
STATUSCODES\nPIPELINING'
send: 'STARTTLS\r\n'
reply: b'220 2.0.0 Ready to start TLS\r\n'
reply: retcode (220); Msg: b'2.0.0 Ready to start TLS'*

After a long time waiting I got:

*Traceback (most recent call last):
...
  File "sendmail.py", line 56, in send_mail
    s.starttls()
  File "C:\usr\bin\python30\lib\smtplib.py", line 619, in starttls
    self.sock = ssl.wrap_socket(self.sock, keyfile, certfile)
  File "C:\usr\bin\python30\lib\ssl.py", line 381, in wrap_socket
    suppress_ragged_eofs=suppress_ragged_eofs)
  File "C:\usr\bin\python30\lib\ssl.py", line 135, in __init__
    raise x
  File "C:\usr\bin\python30\lib\ssl.py", line 131, in __init__
    self.do_handshake()
  File "C:\usr\bin\python30\lib\ssl.py", line 327, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [Errno 8] _ssl.c:486: EOF occurred in violation of protocol*

After this I tried port 465, I got no debug messages like "send...
reply...", and after a long time waiting the following exception occured:

*Traceback (most recent call last):
...*
*  File "sendmail.py", line 49, in send_mail
    s = SMTP('smtp.gmail.com', 465)
  File "C:\usr\bin\python30\lib\smtplib.py", line 239, in __init__
    (code, msg) = self.connect(host, port)
  File "C:\usr\bin\python30\lib\smtplib.py", line 296, in connect
    (code, msg) = self.getreply()
  File "C:\usr\bin\python30\lib\smtplib.py", line 342, in getreply
    raise SMTPServerDisconnected("Connection unexpectedly closed")
smtplib.SMTPServerDisconnected: Connection unexpectedly closed*

Am I doing something wrong? I'm using python30 and python31a2 under Windows
XP

thanks!

Tiefeng Wu
2009-05-03
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From deets at nospam.web.de  Sun May  3 11:59:41 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 03 May 2009 17:59:41 +0200
Subject: Strange interaction between timeit and recursion
In-Reply-To: <00198774$0$9761$c3e8da3@news.astraweb.com>
References: <00198774$0$9761$c3e8da3@news.astraweb.com>
Message-ID: <765tbdF1be7kpU1@mid.uni-berlin.de>

Steven D'Aprano schrieb:
> I'm seeing a strange interaction between timeit and recursion.
> 
> 
>>>> sys.getrecursionlimit()
> 1000
>>>> from timeit import Timer
>>>> setup = """def test(n=1):
> ...     if n < 999: return test(n+1)
> ...     return None
> ... """
>>>> exec setup
>>>> test() is None
> True
>>>> Timer('test()', setup).repeat(number=1)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.5/timeit.py", line 188, in repeat
>     t = self.timeit(number)
>   File "/usr/lib/python2.5/timeit.py", line 161, in timeit
>     timing = self.inner(it, self.timer)
>   File "<timeit-src>", line 9, in inner
>   File "<timeit-src>", line 4, in test
>   File "<timeit-src>", line 4, in test
>   File "<timeit-src>", line 4, in test
>   ...
>   File "<timeit-src>", line 4, in test
> 
> 
> 
> I don't understand why my recursive function hits the recursion limit 
> inside the timeit.Timer when it works outside of it.
> 
> Is there any way to see the current recursion depth at a particular 
> moment?

import inspect

def rec(count=100):
     if not count:
         return
     print len(inspect.getouterframes(inspect.currentframe()))
     rec(count-1)

rec()

Diez


From david at boddie.org.uk  Sun May  3 12:40:27 2009
From: david at boddie.org.uk (David Boddie)
Date: Sun, 03 May 2009 18:40:27 +0200
Subject: stuck with PyOBEX
References: <gt78o7$i9n$1@ss408.t-com.hr> <75opebF19fc22U1@mid.uni-berlin.de>
	<gt80qd$mbf$1@get-news01.get.basefarm.net>
	<gt8pbj$j3o$1@ss408.t-com.hr>
	<gtatk5$pff$1@get-news01.get.basefarm.net>
	<gthe40$87q$1@ss408.t-com.hr>
	<gthm2m$sdr$1@get-news01.get.basefarm.net>
	<gtjktg$ai0$1@ss408.t-com.hr>
Message-ID: <gtkhdr$obj$1@get-news01.get.basefarm.net>

On Sunday 03 May 2009 10:33, alejandro wrote:

> Yes!
> 
>> I'll send you an updated version to try if you would like to test it.

My mails to you keep getting returned, so I've put it here:

http://www.boddie.org.uk/david/Projects/Python/PyOBEX/Software/PyOBEX-0.21.zip

Please let me know if it works on Windows, and feel free to get in touch if
you have any problems.

David


From subhakolkata1234 at gmail.com  Sun May  3 12:51:13 2009
From: subhakolkata1234 at gmail.com (SUBHABRATA BANERJEE)
Date: Sun, 3 May 2009 22:21:13 +0530
Subject: File handling problem.
In-Reply-To: <49FC0864.5080309@wanadoo.fr>
References: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>
	<49FC0864.5080309@wanadoo.fr>
Message-ID: <97c638a50905030951w61639bc9g18f0d378382bd8@mail.gmail.com>

Dear Group,



I am working on a code like the following:



from decimal import*

#SAMPLE TEST PROGRAM FOR FILE

def sample_file_test(n):

    #FILE FOR STORING PROBABILITY VALUES

    open_file=open("/python26/Newfile1.txt","r+")

    #OPENING OF ENGLISH CORPUS

    open_corp_eng=open("/python26/TOTALENGLISHCORPUS1.txt","r")

    #READING THE ENGLISH CORPUS

    corp_read=open_corp_eng.read()

    #CONVERTING THE CORPUS FILE IN WORDS

    corp_word=corp_read.split()

    #EXTRACTING WORDS FROM CORPUS FILE OF WORDS

    for word in corp_word:

        #COUNTING THE WORD

        count1=corp_word.count(word)

        #COUNTING TOTAL NUMBER OF WORDS

        count2=len(corp_word)

        #COUNTING PROBABILITY OF WORD

        count1_dec=Decimal(count1)

        count2_dec=Decimal(count2)

        getcontext().prec = 6

        prob_count=count1_dec/count2_dec

        print prob_count

        string_of_prob_count=str(prob_count)

        file_input_val=open_file.write(string_of_prob_count)

        open_file.close()



The problems I am getting:

(i)                  The probability values are not being stored properly in
file.

(ii)                ?Newfile1.txt? is storing not the series of values but
an arbitrary value from series 0.00000143096

(iii)               As I was testing it again it gave me another error

Traceback (most recent call last):

  File "<pyshell#2>", line 1, in <module>

    sample_file_test(1)

  File "C:\Python26\testprogramforfiles1.py", line 25, in sample_file_test

    file_input_val=open_file.write(string_of_prob_count)

ValueError: I/O operation on closed file



If you can kindly let me know what is the wrong I am doing here.



As I took out the code pasted it in MS-Word before posting, there may be
slight indentation problem.



Best Regards,

Subhabrata.




On Sat, May 2, 2009 at 2:16 PM, Pascal Chambon <chambon.pascal at wanadoo.fr>wrote:

> subhakolkata1234 at gmail.com a ?crit :
>
>>  Dear Group,
>>
>> I am using Python2.6 and has created a file where I like to write some
>> statistical values I am generating. The statistical values are
>> generating in a nice way, but as I am going to write it, it is not
>> taking it, the file is opening or closing properly but the values are
>> not getting stored. It is picking up arbitrary values from the
>> generated set of values and storing it. Is there any solution for it?
>>
>> Best Regards,
>> SBanerjee.
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>>
>>
> Hello
>
> Could you post excerpt of your file-handling code ?
> It might be a buffering problem (although when the file closes, I think
> buffers get flushed), else it's really weird...
>
> Regards,
> pascal
>
>
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From aahz at pythoncraft.com  Sun May  3 12:51:13 2009
From: aahz at pythoncraft.com (Aahz)
Date: 3 May 2009 09:51:13 -0700
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com>
	<b51e6b3a-3219-4b56-9b36-6494c059c761@y10g2000prc.googlegroups.com>
	<75e47cc6-72bc-4941-802e-767f2187445f@d7g2000prl.googlegroups.com>
	<7744f434-dd43-4010-ba25-90096f59d1d9@n7g2000prc.googlegroups.com>
Message-ID: <gtki21$2bk$1@panix3.panix.com>

In article <7744f434-dd43-4010-ba25-90096f59d1d9 at n7g2000prc.googlegroups.com>,
CTO  <debatem1 at gmail.com> wrote:
>
>I will admit, I have *no idea* what that code is doing, but in looking
>through the gc module documentation, I'm seeing the gc.get_objects
>function. Would it be equivalent to what the OP is asking to track the
>size of every element returned by that?

Perhaps.  gc.get_objects() only returns objects tracked by GC (i.e.
containers).  You would need to also check all the object references
held by the containers.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Typing is cheap.  Thinking is expensive."  --Roy Smith


From koranthala at gmail.com  Sun May  3 12:54:11 2009
From: koranthala at gmail.com (koranthala)
Date: Sun, 3 May 2009 09:54:11 -0700 (PDT)
Subject: Reg: MFC71.DLL
Message-ID: <e4979cf9-15ce-4876-9dfb-bf0025e2cc86@d39g2000pra.googlegroups.com>

Hi,
   I had written a python 2.4 program. When I made it to an executable
with py2exe, it told that the mfc71.dll is not added - so I may have
to ship it separately. It also showed many other dll's which are all
in windows/system32 - which again it said is not added.
   Now, I have two questions -
  (1) Should I include mfc71.dll separately? - I found in the
following dicsussion -
http://groups.google.com/group/comp.lang.python/browse_thread/thread/96933f0b9a1a0f12/887675601f5c5c63
- that mfc71 might not be needed. Should I ship it separately?
  (2) The dlls in windows/system32 - do I need to ship it separately?

Koran


From clp2 at rebertia.com  Sun May  3 13:17:22 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 3 May 2009 10:17:22 -0700
Subject: File handling problem.
In-Reply-To: <97c638a50905030951w61639bc9g18f0d378382bd8@mail.gmail.com>
References: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>
	<49FC0864.5080309@wanadoo.fr>
	<97c638a50905030951w61639bc9g18f0d378382bd8@mail.gmail.com>
Message-ID: <50697b2c0905031017k10cc564dj6e575eaa150916f@mail.gmail.com>

On Sun, May 3, 2009 at 9:51 AM, SUBHABRATA BANERJEE
<subhakolkata1234 at gmail.com> wrote:
> Dear Group,
>
>
>
> I am working on a code like the following:
>
>
>
> from decimal import*
>
> #SAMPLE TEST PROGRAM FOR FILE
>
> def sample_file_test(n):
>
> ??? #FILE FOR STORING PROBABILITY VALUES
>
> ??? open_file=open("/python26/Newfile1.txt","r+")

Is there a reason you must output the results to the same file the
input came from? It's possible this is part of your problems.

>
> ??? #OPENING OF ENGLISH CORPUS
>
> ??? open_corp_eng=open("/python26/TOTALENGLISHCORPUS1.txt","r")
>
> ??? #READING THE ENGLISH CORPUS
>
> ??? corp_read=open_corp_eng.read()
>
> ??? #CONVERTING THE CORPUS FILE IN WORDS
>
> ??? corp_word=corp_read.split()
>
> ??? #EXTRACTING WORDS FROM CORPUS FILE OF WORDS
>
> ??? for word in corp_word:
>
> ??????? #COUNTING THE WORD
>
> ??????? count1=corp_word.count(word)

Note: Your program is currently O(N^2) rather than O(N) because you
re-count the number of occurrences of each word /on every occurrence
of the word/.

> ??????? #COUNTING TOTAL NUMBER OF WORDS
>
> ??????? count2=len(corp_word)
>
> ??????? #COUNTING PROBABILITY OF WORD
>
> ??????? count1_dec=Decimal(count1)
>
> ??????? count2_dec=Decimal(count2)
>
> ??????? getcontext().prec = 6
>
> ??????? prob_count=count1_dec/count2_dec
>
> ??????? print prob_count
>
> ??????? string_of_prob_count=str(prob_count)
>
> ??????? file_input_val=open_file.write(string_of_prob_count)
>
> ??????? open_file.close()

You shouldn't be closing the file until the /entire loop/ has finished
writing to the file. So the previous line should be dedented.

>
>
>
> The problems I am getting:
>
> (i)????????????????? The probability values are not being stored properly in
> file.

Also, you're currently not putting any separator between consecutive
entires, so it's all going to run together as one long line.
Have you considered using one of the std lib modules to output the
file in a well-defined human-readable format such as JSON or CSV?

> (ii)??????????????? ?Newfile1.txt? is storing not the series of values but
> an arbitrary value from series 0.00000143096
>
> (iii)?????????????? As I was testing it again it gave me another error
>
> Traceback (most recent call last):
>
> ? File "<pyshell#2>", line 1, in <module>
>
> ??? sample_file_test(1)
>
> ? File "C:\Python26\testprogramforfiles1.py", line 25, in sample_file_test
>
> ??? file_input_val=open_file.write(string_of_prob_count)
>
> ValueError: I/O operation on closed file


Cheers,
Chris
-- 
http://blog.rebertia.com


From debatem1 at gmail.com  Sun May  3 13:29:36 2009
From: debatem1 at gmail.com (CTO)
Date: Sun, 3 May 2009 10:29:36 -0700 (PDT)
Subject: How to measure the memory cost in Python?
References: <11aabe3b0905010103r14b05fccg7a02c6ae010cd9ad@mail.gmail.com> 
	<b51e6b3a-3219-4b56-9b36-6494c059c761@y10g2000prc.googlegroups.com> 
	<75e47cc6-72bc-4941-802e-767f2187445f@d7g2000prl.googlegroups.com> 
	<7744f434-dd43-4010-ba25-90096f59d1d9@n7g2000prc.googlegroups.com> 
	<gtki21$2bk$1@panix3.panix.com>
Message-ID: <b639362b-cd66-492c-8af8-559ca5411582@g20g2000vba.googlegroups.com>

Alright, it's pretty obvious that I have a lot to learn before I'll be
able
to intelligently address this problem, but if somebody could point me
at
something that would help me figure out the terminology at least I'd
really
appreciate it. From what you're saying, it sounds like a combination
of the
above approaches would do what I'm asking- ie, get all the containers,
then
get the contents of each container- but I don't see why that would
work
unless gc tracks some kind of global container for small values,
which, as
I (poorly) understand it, are tracked separately?

Thanks again,
Geremy Condra



From subhakolkata1234 at gmail.com  Sun May  3 13:33:52 2009
From: subhakolkata1234 at gmail.com (SUBHABRATA BANERJEE)
Date: Sun, 3 May 2009 23:03:52 +0530
Subject: File handling problem.
In-Reply-To: <50697b2c0905031017k10cc564dj6e575eaa150916f@mail.gmail.com>
References: <a35327e0-4630-44aa-be01-14da86bd8298@x1g2000prh.googlegroups.com>
	<49FC0864.5080309@wanadoo.fr>
	<97c638a50905030951w61639bc9g18f0d378382bd8@mail.gmail.com>
	<50697b2c0905031017k10cc564dj6e575eaa150916f@mail.gmail.com>
Message-ID: <97c638a50905031033x5ce3b500i381b5eb98b0d114d@mail.gmail.com>

Dear Sir,
Thanx for your prompt reply, I would be trying to work on your suggestion
and get back to you as soon as possible.
Best Regards,
Subhabrata.

On Sun, May 3, 2009 at 10:47 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Sun, May 3, 2009 at 9:51 AM, SUBHABRATA BANERJEE
> <subhakolkata1234 at gmail.com> wrote:
> > Dear Group,
> >
> >
> >
> > I am working on a code like the following:
> >
> >
> >
> > from decimal import*
> >
> > #SAMPLE TEST PROGRAM FOR FILE
> >
> > def sample_file_test(n):
> >
> >     #FILE FOR STORING PROBABILITY VALUES
> >
> >     open_file=open("/python26/Newfile1.txt","r+")
>
> Is there a reason you must output the results to the same file the
> input came from? It's possible this is part of your problems.
>
> >
> >     #OPENING OF ENGLISH CORPUS
> >
> >     open_corp_eng=open("/python26/TOTALENGLISHCORPUS1.txt","r")
> >
> >     #READING THE ENGLISH CORPUS
> >
> >     corp_read=open_corp_eng.read()
> >
> >     #CONVERTING THE CORPUS FILE IN WORDS
> >
> >     corp_word=corp_read.split()
> >
> >     #EXTRACTING WORDS FROM CORPUS FILE OF WORDS
> >
> >     for word in corp_word:
> >
> >         #COUNTING THE WORD
> >
> >         count1=corp_word.count(word)
>
> Note: Your program is currently O(N^2) rather than O(N) because you
> re-count the number of occurrences of each word /on every occurrence
> of the word/.
>
> >         #COUNTING TOTAL NUMBER OF WORDS
> >
> >         count2=len(corp_word)
> >
> >         #COUNTING PROBABILITY OF WORD
> >
> >         count1_dec=Decimal(count1)
> >
> >         count2_dec=Decimal(count2)
> >
> >         getcontext().prec = 6
> >
> >         prob_count=count1_dec/count2_dec
> >
> >         print prob_count
> >
> >         string_of_prob_count=str(prob_count)
> >
> >         file_input_val=open_file.write(string_of_prob_count)
> >
> >         open_file.close()
>
> You shouldn't be closing the file until the /entire loop/ has finished
> writing to the file. So the previous line should be dedented.
>
> >
> >
> >
> > The problems I am getting:
> >
> > (i)                  The probability values are not being stored properly
> in
> > file.
>
> Also, you're currently not putting any separator between consecutive
> entires, so it's all going to run together as one long line.
> Have you considered using one of the std lib modules to output the
> file in a well-defined human-readable format such as JSON or CSV?
>
> > (ii)                ?Newfile1.txt? is storing not the series of values
> but
> > an arbitrary value from series 0.00000143096
> >
> > (iii)               As I was testing it again it gave me another error
> >
> > Traceback (most recent call last):
> >
> >   File "<pyshell#2>", line 1, in <module>
> >
> >     sample_file_test(1)
> >
> >   File "C:\Python26\testprogramforfiles1.py", line 25, in
> sample_file_test
> >
> >     file_input_val=open_file.write(string_of_prob_count)
> >
> > ValueError: I/O operation on closed file
>
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>
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From gagsl-py2 at yahoo.com.ar  Sun May  3 14:08:55 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 03 May 2009 15:08:55 -0300
Subject: smtplib send email by using gmail smtp server
References: <4314c1f70905030818y73809e16s45e04f8edb5ce714@mail.gmail.com>
Message-ID: <op.utc8o5g6x6zn5v@gabriel.sleipnir-bsas>

En Sun, 03 May 2009 12:18:33 -0300, tiefeng wu <icebergwtf at gmail.com>  
escribi?:

> I'm tring send email using smtp.gmail.com
>
> here's the code:
>
> *s = SMTP('**smtp.gmail.com* <http://smtp.gmail.com/>*', 25)
> s.set_debuglevel(1)*
> *s.ehlo()
> s.starttls()
> s.ehlo()
> s.login(mygmailaccount, mygmailpassword)
> s.sendmail(from_addr, to_addr_list, message)
> s.close()*

I've tested with 3.0.1 on Windows XP and worked fine. Seems to be a  
problem in the SSL support, but that's all I could say.

-- 
Gabriel Genellina



From davea at ieee.org  Sun May  3 15:14:13 2009
From: davea at ieee.org (Dave Angel)
Date: Sun, 03 May 2009 15:14:13 -0400
Subject: AutoComplete in C++ Editor for Python
In-Reply-To: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>
References: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>
Message-ID: <49FDED05.5080802@ieee.org>

flamz3d at gmail.com wrote:
> Hello,
> I am embedding python support in my C++ application and was looking at
> adding "Intellisense" or "AutoComplete" support.
>
> I found a way to do it using the "dir" function, but this creates a
> problem. Here's why. Let's say I have the following code in my editor:
>
> import sys
> x = sys
>
>
> Now, I would like to get all attributes of the object called 'x'. I
> can "instrument" the code and add "print dir(x)" at the end,
> temporarily redirect the python output to a string and execute the
> code.
>
> But this is not safe: I do NOT want to execute the code while the user
> is typing!
>
> Is there a way to "compile" the python code and get access to the
> symbol table from that compiled block?
>
> Did anybody ever implement AutoComplete in a editor for Python?
>
> cheers.
>
>   
Several editors for Python support auto-complete, to one extent or 
another.  The only one I have experience with is Komodo.  Komodo runs in 
a separate process, so it doesn't suffer from the problems of having two 
gui event-loops in the same process, and other similar problems.   It 
also won't be executing code that might have side effects in the child 
process.

The downside is that in order to do auto-complete, it has to figure it 
out from other clues.  From the docs, and from reading, and from 
experiementing, I believe that it uses two approaches.  One approach is 
a set of language files which try to describe all the symbols in the 
standard language and library.  They have one for each release (2.4, 
2.5, ...)  Theoretically, you could add your own for other libraries.  
Second approach is to parse the code that's visible to it.  That parsing 
is well done, and surprisingly quick, but there are lots of tricks a 
developer might use that can fool it.  For example, wxPython lets you 
import just one symbol, and lots more appear magically.  It's no big 
deal, they have code structured one way, but the interface is very 
different.  Catch is that code completion frequently gets fooled by these.

I'd point out that if you do walk the dictionaries at run time, you'll 
get different results when you do it with nothing running than if you do 
a strictly static analysis.  So some things might only show up if you've 
stepped into the function with the magic going on.

Simplest example I can come up with of something a static analysis won't 
spot:   An instance object    obj   may have some number of attributes 
assigned the the __init__() method.  But it could also have new fields 
added by anyone with a referent into it.

There is a Python parser in module ast.  Perhaps that'd be some help.  
I've not used it, so can't give you any specifics.


DaveA


From cdalten at gmail.com  Sun May  3 15:41:28 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sun, 3 May 2009 12:41:28 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
Message-ID: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>

Let's say there is a new zip file with updated information every 30
minutes on a remote website. Now, I wanna connect to this website
every 30 minutes, download the file, extract the information, and then
have the program search the file search for certain items.

Would it be better to use threads to break this up? I have one thread
download the data and then have another to actually process the data .
Or would it be better to use fork?



From deets at nospam.web.de  Sun May  3 16:16:49 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 03 May 2009 22:16:49 +0200
Subject: Is it better to use threads or fork in the following case
In-Reply-To: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
Message-ID: <766cdhF1bk2ipU1@mid.uni-berlin.de>

grocery_stocker schrieb:
> Let's say there is a new zip file with updated information every 30
> minutes on a remote website. Now, I wanna connect to this website
> every 30 minutes, download the file, extract the information, and then
> have the program search the file search for certain items.
> 
> Would it be better to use threads to break this up? I have one thread
> download the data and then have another to actually process the data .
> Or would it be better to use fork?

Neither. Why do you think you need concurrency at all?

Diez



From rose.0978 at gmail.com  Sun May  3 16:21:49 2009
From: rose.0978 at gmail.com (rose)
Date: Sun, 3 May 2009 13:21:49 -0700 (PDT)
Subject: Using Help inside Python
References: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>
	<00198f45$0$9761$c3e8da3@news.astraweb.com>
Message-ID: <465fe83f-3269-4fa3-8d6a-75799254e1ba@z8g2000prd.googlegroups.com>

On May 3, 8:15?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sun, 03 May 2009 07:49:49 -0700, rose wrote:
> > Hi,
> > ? ? ? ? ? ? I have an idea of the basics of programming language in
> > general. How to access help in python i.e. help followed by something or
> > to get to know about some inbuilt module or method etc. how do I access
> > help from within the IDLE using the help command.
>
> > Thank You.
>
> At the prompt, type any of:
>
> help()
>
> help(module)
>
> help(function)
>
> help(any_object)
>
> help("keyword") ?# note the quotes around the keyword
>
> then hit Enter to get help about that object or keyword.
>
> --
> Steven

Many Thanks to you Steven, for such a concise explanation of using the
help. May I request some examples to make it a bit more explicit.


From cdalten at gmail.com  Sun May  3 16:29:38 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sun, 3 May 2009 13:29:38 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
Message-ID: <5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>

On May 3, 1:16 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> grocery_stocker schrieb:
>
> > Let's say there is a new zip file with updated information every 30
> > minutes on a remote website. Now, I wanna connect to this website
> > every 30 minutes, download the file, extract the information, and then
> > have the program search the file search for certain items.
>
> > Would it be better to use threads to break this up? I have one thread
> > download the data and then have another to actually process the data .
> > Or would it be better to use fork?
>
> Neither. Why do you think you need concurrency at all?
>

Okay, here is what was going through my mind. I'm a 56k dialup modem.
What happens it takes me 15 minutes to download the file? Now let's
say during those 15 minutes, the program needs to parse the data in
the existing file.



From deets at nospam.web.de  Sun May  3 16:40:27 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 03 May 2009 22:40:27 +0200
Subject: Is it better to use threads or fork in the following case
In-Reply-To: <5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
Message-ID: <766dprF1bc1asU1@mid.uni-berlin.de>

grocery_stocker schrieb:
> On May 3, 1:16 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>> grocery_stocker schrieb:
>>
>>> Let's say there is a new zip file with updated information every 30
>>> minutes on a remote website. Now, I wanna connect to this website
>>> every 30 minutes, download the file, extract the information, and then
>>> have the program search the file search for certain items.
>>> Would it be better to use threads to break this up? I have one thread
>>> download the data and then have another to actually process the data .
>>> Or would it be better to use fork?
>> Neither. Why do you think you need concurrency at all?
>>
> 
> Okay, here is what was going through my mind. I'm a 56k dialup modem.
> What happens it takes me 15 minutes to download the file? Now let's
> say during those 15 minutes, the program needs to parse the data in
> the existing file.

Is this an exercise in asking 20 hypothetical questions?

Getting concurrency right isn't trivial, so if you absolute don't need 
this, don't do it.

Diez


From zentraders at gmail.com  Sun May  3 16:41:49 2009
From: zentraders at gmail.com (Zentrader)
Date: Sun, 3 May 2009 13:41:49 -0700 (PDT)
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
Message-ID: <930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>

There is no need for a function or a generator.  A for() loop is a
unique case of a while loop
## for i in range(-10.5, 10.5, 0.1):
ctr = -10.5
while ctr < 10.5:
   print ctr
   ctr += 0.1


From debatem1 at gmail.com  Sun May  3 16:44:32 2009
From: debatem1 at gmail.com (CTO)
Date: Sun, 3 May 2009 13:44:32 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
Message-ID: <477fce8b-98b6-46c8-a839-496a17cb5032@s28g2000vbp.googlegroups.com>

Probably better just to check HEAD and see if its updated within the
time you're
looking at before any unpack. Even on a 56k that's going to be pretty
fast, and
you don't risk unpacking an old file while a new version is on the
way.

If you still want to be able to unpack the old file if there's an
update then
you're probably right about needing to run it concurrently, and
personally I'd
just fork it for ease of use- it doesn't sound like you're trying to
run 100,000
of these at the same time, and you're saving the file anyway.

Geremy Condra



From paul.hankin at gmail.com  Sun May  3 16:45:36 2009
From: paul.hankin at gmail.com (Paul Hankin)
Date: Sun, 3 May 2009 13:45:36 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
Message-ID: <bea7d12e-2bda-4ec6-868b-440b79bd28e4@21g2000vbk.googlegroups.com>

On May 3, 10:29?pm, grocery_stocker <cdal... at gmail.com> wrote:
> On May 3, 1:16 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> > grocery_stocker schrieb:
>
> > > Let's say there is a new zip file with updated information every 30
> > > minutes on a remote website. Now, I wanna connect to this website
> > > every 30 minutes, download the file, extract the information, and then
> > > have the program search the file search for certain items.
>
> > > Would it be better to use threads to break this up? I have one thread
> > > download the data and then have another to actually process the data .
> > > Or would it be better to use fork?
>
> > Neither. Why do you think you need concurrency at all?
>
> Okay, here is what was going through my mind. I'm a 56k dialup modem.
> What happens it takes me 15 minutes to download the file? Now let's
> say during those 15 minutes, the program needs to parse the data in
> the existing file.

If your modem is going at full speed for those 15 minutes, you'll have
around 6.3Mb of data. Even after decompressing, and unless the data is
in some quite difficult to parse format, it'll take seconds to
process.

--
Paul Hankin


From google at mrabarnett.plus.com  Sun May  3 16:52:26 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 03 May 2009 21:52:26 +0100
Subject: for with decimal values?
In-Reply-To: <930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
Message-ID: <49FE040A.8010600@mrabarnett.plus.com>

Zentrader wrote:
> There is no need for a function or a generator.  A for() loop is a
> unique case of a while loop
> ## for i in range(-10.5, 10.5, 0.1):
> ctr = -10.5
> while ctr < 10.5:
>    print ctr
>    ctr += 0.1
> 
Python stores floats in binary, and 0.1 can't be held exactly as a
fractional binary number. Therefore it might be better to produce the
values as integers divided by 10:

for i in range(-105, 105):
     i = i / 10.0
     # do stuff here using i


From cdalten at gmail.com  Sun May  3 16:59:11 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sun, 3 May 2009 13:59:11 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
	<766dprF1bc1asU1@mid.uni-berlin.de>
Message-ID: <58b1d8d5-aee0-4ae0-8310-4ae8d430dddd@d38g2000prn.googlegroups.com>

On May 3, 1:40 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> grocery_stocker schrieb:
>
>
>
> > On May 3, 1:16 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> >> grocery_stocker schrieb:
>
> >>> Let's say there is a new zip file with updated information every 30
> >>> minutes on a remote website. Now, I wanna connect to this website
> >>> every 30 minutes, download the file, extract the information, and then
> >>> have the program search the file search for certain items.
> >>> Would it be better to use threads to break this up? I have one thread
> >>> download the data and then have another to actually process the data .
> >>> Or would it be better to use fork?
> >> Neither. Why do you think you need concurrency at all?
>
> > Okay, here is what was going through my mind. I'm a 56k dialup modem.
> > What happens it takes me 15 minutes to download the file? Now let's
> > say during those 15 minutes, the program needs to parse the data in
> > the existing file.
>
> Is this an exercise in asking 20 hypothetical questions?
>

No. This the prelude to me writing a real life python program.


From gagsl-py2 at yahoo.com.ar  Sun May  3 17:38:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 03 May 2009 18:38:56 -0300
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
	<bea7d12e-2bda-4ec6-868b-440b79bd28e4@21g2000vbk.googlegroups.com>
Message-ID: <op.utdhu31ux6zn5v@gabriel.sleipnir-bsas>

En Sun, 03 May 2009 17:45:36 -0300, Paul Hankin <paul.hankin at gmail.com>
escribi?:
> On May 3, 10:29?pm, grocery_stocker <cdal... at gmail.com> wrote:
>> On May 3, 1:16 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>> > grocery_stocker schrieb:

>> > > Would it be better to use threads to break this up? I have one  
>> thread
>> > > download the data and then have another to actually process the  
>> data .
>> > > Or would it be better to use fork?
>>
>> > Neither. Why do you think you need concurrency at all?
>>
>> Okay, here is what was going through my mind. I'm a 56k dialup modem.
>> What happens it takes me 15 minutes to download the file? Now let's
>> say during those 15 minutes, the program needs to parse the data in
>> the existing file.
>
> If your modem is going at full speed for those 15 minutes, you'll have
> around 6.3Mb of data. Even after decompressing, and unless the data is
> in some quite difficult to parse format, it'll take seconds to
> process.

In addition, the zip file format stores the directory at the end of the  
file. So you can't process it until it's completely downloaded.  
Concurrency doesn't help here.

-- 
Gabriel Genellina



From debatem1 at gmail.com  Sun May  3 17:47:27 2009
From: debatem1 at gmail.com (CTO)
Date: Sun, 3 May 2009 14:47:27 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
	<bea7d12e-2bda-4ec6-868b-440b79bd28e4@21g2000vbk.googlegroups.com> 
	<mailman.5014.1241386734.11746.python-list@python.org>
Message-ID: <4b87a84a-eef0-42cb-91f7-6ade662bdd4d@t10g2000vbg.googlegroups.com>

> In addition, the zip file format stores the directory at the end of the ?
> file. So you can't process it until it's completely downloaded. ?
> Concurrency doesn't help here.

Don't think that's relevant, if I'm understanding the OP correctly.
Lets say you've downloaded the file once and you're doing whatever
the app does with it. Now, while that's happening the half an hour
time limit comes up. Now you want to start another download, but
you also want to continue to work with the old version. Voila,
concurrency.



From martin.hellwig at dcuktec.org  Sun May  3 18:14:19 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sun, 03 May 2009 23:14:19 +0100
Subject: Is it better to use threads or fork in the following case
In-Reply-To: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
Message-ID: <xZOdnVOmOICgimPUnZ2dnUVZ8tqdnZ2d@bt.com>

grocery_stocker wrote:
> Let's say there is a new zip file with updated information every 30
> minutes on a remote website. Now, I wanna connect to this website
> every 30 minutes, download the file, extract the information, and then
> have the program search the file search for certain items.
> 
> Would it be better to use threads to break this up? I have one thread
> download the data and then have another to actually process the data .
> Or would it be better to use fork?
> 

I concur with Diez that I don't think threading/forking will bring 
significant advantages for this particular case.

That said, if you are thinking from a responsiveness perspective, I 
would definitely say threading.

If you ask from a performance perspective I would need to know what OS 
you are running (that is is if forking is even supported) and if you 
have multiple CPU's and if you are actually planning on spawning that 
sub-process on a (possibly) a different CPU as the parent process.

So the workflow would be something like this:
Downloading block
If block has enough data to process, spawn a new process (using 
multiprocessing module) and let it write the result back to x (requiring 
lock and release).

Things to keep in mind, is the overhead of:
- Multiple interpreters running on the multiple CPU's
- IPC
- Locking/Releasing
Still less then if you would have no threading at all?

About forking, this usually means that the child process starts out as 
an exact copy of the parent process and runs ideally mostly independent 
of the parent meaning that the best case would be that the child process 
can run fine without the presents of the parent process, is this really 
what you want to do?

-- 
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'


From bearophileHUGS at lycos.com  Sun May  3 18:39:47 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sun, 3 May 2009 15:39:47 -0700 (PDT)
Subject: Self function
Message-ID: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>

Sometimes I rename recursive functions, or I duplicate&modify them,
and they stop working because inside them there's one or more copy of
their old name.
This happens to me more than one time every year.
So I have written this:

from inspect import getframeinfo, currentframe

def SOMEVERYUGLYNAME(n):
    if n <= 1:
        return 1
    else:
        self_name = getframeinfo(currentframe()).function
        #self_name = getframeinfo(currentframe())[2] # older python

        # only if it's a global function
        #return n * globals()[self_name](n - 1)
        return n * eval(self_name + "(%d)" % (n - 1))
assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6

Are there nicer ways to do that? I don't know.
If there aren't, then a way may be added.
An idea-syntax:

def fact(n):
    return 1 if n <= 1 else n * inspect.self(n - 1)

Or even a lambda, because you don't need the name anymore to call the
function:

fact = lambda n: 1 if n <= 1 else n * self(n - 1)

(If you have two or more recursive functions that call each other this
idea can't be used, but I think such situations are uncommon enough to
not deserve help from the language).

Bye,
bearophile


From rhodri at wildebst.demon.co.uk  Sun May  3 19:00:42 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 04 May 2009 00:00:42 +0100
Subject: Using Help inside Python
In-Reply-To: <465fe83f-3269-4fa3-8d6a-75799254e1ba@z8g2000prd.googlegroups.com>
References: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>
	<00198f45$0$9761$c3e8da3@news.astraweb.com>
	<465fe83f-3269-4fa3-8d6a-75799254e1ba@z8g2000prd.googlegroups.com>
Message-ID: <op.utdl7g2ha8ncjz@gnudebst>

On Sun, 03 May 2009 21:21:49 +0100, rose <rose.0978 at gmail.com> wrote:

> On May 3, 8:15?pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> On Sun, 03 May 2009 07:49:49 -0700, rose wrote:
>> > Hi,
>> > ? ? ? ? ? ? I have an idea of the basics of programming language in
>> > general. How to access help in python i.e. help followed by something  
>> or
>> > to get to know about some inbuilt module or method etc. how do I  
>> access
>> > help from within the IDLE using the help command.
>>
>> > Thank You.
>>
>> At the prompt, type any of:
>>
>> help()
>>
>> help(module)
>>
>> help(function)
>>
>> help(any_object)
>>
>> help("keyword") ?# note the quotes around the keyword
>>
>> then hit Enter to get help about that object or keyword.

>
> Many Thanks to you Steven, for such a concise explanation of using the
> help. May I request some examples to make it a bit more explicit.

I'll try and expand on Steven's examples a bit, but really

>>> help()

gives you quite a lot of the information anyway.  If you want help on
the "for" keyword, for example, type:

>>> help("for")

(As Steven said, note the quote marks.)  If you want help on anything
else in Python at all, be it a function, module or object, then stick
that object in the brackets.  Thus:

>>> help(123)

tells you all about Python's integers, while

>>> l = [1, 2, 3]
>>> help(l)

tells you about lists.

The only gotcha is that if you try getting help on a string object,
it thinks that you're trying to look up a keyword.  In other words:

>>> s = "for"
>>> help(s)

and

>>> help("for")

get the same message.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From norseman at hughes.net  Sun May  3 19:13:32 2009
From: norseman at hughes.net (norseman)
Date: Sun, 03 May 2009 16:13:32 -0700
Subject: Tkinter, Trouble with Message,Label widget
Message-ID: <49FE251C.40103@hughes.net>


Intended action:
	Two Tkinter windows.
	W1 is complex, user interacts with program from here ONLY
	W2 is for display only, NO user interactions

I can get info to W2.
But to get it to update I first have to manually kill it.
Program does create both. Both terminate when programs says.
I want to post 'verbal' (text) progress reports to W2 and I want it to 
self update at posting. (Or at least appear to do so to the user.) If a 
control sequence is changed, the posting is to reflect it.  As long as I 
manually kill it, everything works fine, but I get:
	1) finger cramps
	2) quite uhhh...  'unhappy' at the stupidity requiring that...

There has to be some way of using a Message or Label (or some) widget as 
a simple posting board.

I have been using the python print statement (via what Windows calls a 
Command Window) quite nicely in Linux.  Under Linux only I would be 
content to go that route. Unfortunately the program also has to work in 
MicroSoft. And Microsoft has much to much of the old dinosaur age still 
in it.

Why the posting board?
	1) It posts for visual inspection the current controls chosen.
               A tally, a synopsis of the current choice pattern.
	2) It remains visible while the control panel vanishes to give
              the user the full screen to conduct the rest of the human
              interface with vendor's product. It reminds the user of
              what is to happen next.
	3) On re-display of main control screen the posting again
              functions as in 1) above. Thus serving as a reminder of
              "What I did last", because it does not change until a
              button is pressed, as well as "What I'm about to do."

This can't be the first time someone has needed this. But I have not 
found (probably just plain missed) it in all Tkinter references I have 
been able to find.

I have tried:
... (overhead)
a= StringVar()
p="string with formatting, variables and new lines"
a.set(p)
...  Label(root, textvar= '%s%s...' % p[:],
and a number of other things  and either it fails completely, looks 
horrible or generates lots of horrible messages telling me it don't like 
me because I'm not allowed to do that. :)

print '%s%s%...' % p[:]     works in any "Command Window", Linux or MS
The   ...Label(...  text= '%s%s%...' % p[:], ....
   works if I manually destroy the posting window to get each update.

I think I need a way to generate the W2 and exit leaving it visible.
Question is  HOW?  Or what is needed to effect the same?
Then the update can destroy old one and put up new one.


ANY  help is appreciated.

Using: Python 2.5.2, Linux Slackware 10.2
Today: 20090503
Snippets: non functional, for clarifying only

Steve


From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 19:19:34 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 23:19:34 GMT
Subject: Using Help inside Python
References: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>
	<00198f45$0$9761$c3e8da3@news.astraweb.com>
	<465fe83f-3269-4fa3-8d6a-75799254e1ba@z8g2000prd.googlegroups.com>
Message-ID: <001a00be$0$9761$c3e8da3@news.astraweb.com>

On Sun, 03 May 2009 13:21:49 -0700, rose wrote:

> Many Thanks to you Steven, for such a concise explanation of using the
> help. May I request some examples to make it a bit more explicit.

Suppose you want to get help about the max() function.

Inside IDLE, at the command prompt, type:

help(max) <ENTER>

where <ENTER> means "press the ENTER key".

If you want help about the min() function instead, type:

help(min) <ENTER>


If you have an object called "parrot", and you want to get help about 
that object, do this:

help(parrot) <ENTER>

If you just want general help about everything, type:

help() <ENTER>

and follow the instructions on screen.


-- 
Steven


From gdamjan at gmail.com  Sun May  3 19:49:25 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 04 May 2009 01:49:25 +0200
Subject: return functions
References: <f6a8cbe2-2078-4e0a-8b52-6437b440d18d@o30g2000vbc.googlegroups.com>
	<5dde50ab-c47d-471a-a8cb-3824387f42c5@x1g2000prh.googlegroups.com>
Message-ID: <55n1d6-4km.ln1@archaeopteryx.softver.org.mk>

> You seem to have finally discovered that when using Apache/mod_wsgi,
> Apache does a level of URL matching to filesystem based resources.

didn't Paste include something like that ...

> This isn't automatic in normal WSGI servers unless you use a WSGI
> middleware that does the mapping for you. :-)

finally found it  http://pythonpaste.org/modules/urlparser.html


-- 
?????? ( http://softver.org.mk/damjan/ )

  Begin...the rest is easy.



From steve at REMOVE-THIS-cybersource.com.au  Sun May  3 19:52:29 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 May 2009 23:52:29 GMT
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
Message-ID: <001a0876$0$9761$c3e8da3@news.astraweb.com>

On Sun, 03 May 2009 13:41:49 -0700, Zentrader wrote:

> There is no need for a function or a generator.  A for() loop is a
> unique case of a while loop
> ## for i in range(-10.5, 10.5, 0.1):
> ctr = -10.5
> while ctr < 10.5:
>    print ctr
>    ctr += 0.1


To match the semantics of range(), the final value to ctr must be less 
than but not equal to 10.5. 

>>> print ctr
10.6

Your solution does not do this -- it goes one steps too many, and then 
misleadingly fails to print the value. This is a bug waiting to hit, any 
time somebody runs your loop then goes to use ctr outside the loop.



-- 
Steven


From gdamjan at gmail.com  Sun May  3 19:58:19 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 04 May 2009 01:58:19 +0200
Subject: Doc strings in descriptors
References: <gtj70a$h7d$1@foggy.unx.sas.com>
Message-ID: <rln1d6-mkm.ln1@archaeopteryx.softver.org.mk>

> I have a simple descriptor to create a cached property as shown below.
...
> The problem is that when I use the help() function on them, I don't
> get the doc string from the function that is being wrapped. 
...
> What do I need to do to get the doc string of the wrapped function to
> apper when using help()?

take a look at
http://pypi.python.org/pypi/decorator
and possibly 
http://docs.python.org/library/functools.html#functools.update_wrapper


-- 
?????? ( http://softver.org.mk/damjan/ )

Real men don't use backups, they post their stuff on a public ftp server 
and let the rest of the world make copies.
   -- Linus Torvalds



From gagsl-py2 at yahoo.com.ar  Sun May  3 20:05:33 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 03 May 2009 21:05:33 -0300
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
Message-ID: <op.utdo7jajx6zn5v@gabriel.sleipnir-bsas>

En Sun, 03 May 2009 17:41:49 -0300, Zentrader <zentraders at gmail.com>  
escribi?:

> There is no need for a function or a generator.  A for() loop is a
> unique case of a while loop
> ## for i in range(-10.5, 10.5, 0.1):
> ctr = -10.5
> while ctr < 10.5:
>    print ctr
>    ctr += 0.1

Isn't so easy. You have representation errors and rounding errors here,  
and they accumulate. The last number printed should be 10.4 but I get 10.5:
...
10.3
10.4
10.5
(or more precisely, 10.499999999999959)

Also, after exiting a for loop, the *last* value used is retained. In your  
while loop, the ctr variable contains the *next* value.

-- 
Gabriel Genellina



From emile at fenx.com  Sun May  3 20:21:53 2009
From: emile at fenx.com (Emile van Sebille)
Date: Sun, 03 May 2009 17:21:53 -0700
Subject: Self function
In-Reply-To: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
Message-ID: <gtlcba$vj0$1@ger.gmane.org>

On 5/3/2009 3:39 PM bearophileHUGS at lycos.com said...
> Sometimes I rename recursive functions, or I duplicate&modify them,
> and they stop working because inside them there's one or more copy of
> their old name.
> This happens to me more than one time every year.
> So I have written this:
> 
> from inspect import getframeinfo, currentframe
> 
> def SOMEVERYUGLYNAME(n):
>     if n <= 1:
>         return 1
>     else:
>         self_name = getframeinfo(currentframe()).function
>         #self_name = getframeinfo(currentframe())[2] # older python
> 
>         # only if it's a global function
>         #return n * globals()[self_name](n - 1)
>         return n * eval(self_name + "(%d)" % (n - 1))
> assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6
> 
> Are there nicer ways to do that? 

I've sometimes used classes like:


class SOMEVERYUGLYNAME:
     def __call__(self,n):
         if n<=1:
             return 1
         else:
             return n*self.__class__()(n-1)

assert SOMEVERYUGLYNAME()(6) == 2*3*4*5*6


It's probably nicer (for some definition of nice), but I wouldn't say 
it's nice.

Emile



From gagsl-py2 at yahoo.com.ar  Sun May  3 20:22:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 03 May 2009 21:22:21 -0300
Subject: Doc strings in descriptors
References: <gtj70a$h7d$1@foggy.unx.sas.com>
	<rln1d6-mkm.ln1@archaeopteryx.softver.org.mk>
Message-ID: <op.utdpzji9x6zn5v@gabriel.sleipnir-bsas>

En Sun, 03 May 2009 20:58:19 -0300, ?????? ??????????? <gdamjan at gmail.com>  
escribi?:

>> I have a simple descriptor to create a cached property as shown below.
> ...
>> The problem is that when I use the help() function on them, I don't
>> get the doc string from the function that is being wrapped.
> ...
>> What do I need to do to get the doc string of the wrapped function to
>> apper when using help()?
>
> take a look at
> http://pypi.python.org/pypi/decorator
> and possibly
> http://docs.python.org/library/functools.html#functools.update_wrapper

That doesn't help. The descriptor *does* have its docstring copied from  
the function. But pydoc (the module behind the help system) doesn't handle  
the case - "normal" properties are handled specially, but a generic  
descriptor like that is not understood.

(and it's not so easy to fix - pydoc does a lot of things, all intermixed:  
it tries to discover all
methods and attributes, determine which are relevant, extract  
documentation from them, organize and clasify such documentation, generate  
HTML files/text files/present it to the user/run a webserver/invoke the  
pager... Too much for my taste, but I disgress...)

-- 
Gabriel Genellina



From doctoresam at gmail.com  Sun May  3 20:41:47 2009
From: doctoresam at gmail.com (Deep_Feelings)
Date: Sun, 3 May 2009 17:41:47 -0700 (PDT)
Subject: python docs for beginner programmer?
Message-ID: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>

Starting to learn python and because i don't want to read something
twice (i get bored quickly) i need a source to learn python that is as
comprehensive as possible.


Do you think python online docs are good starting point for me? ( i
experience with other programming languages ) or should i get giant
book or something ?

thankx



From ldo at geek-central.gen.new_zealand  Sun May  3 20:44:59 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 04 May 2009 12:44:59 +1200
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
Message-ID: <gtldqb$91p$1@lust.ihug.co.nz>

In message 
<deb7353b-19f7-48d7-9777-92b02eed7879 at r3g2000vbp.googlegroups.com>, 
Deep_Feelings wrote:

> Do you think python online docs are good starting point for me?

Why not try them and see?



From doctoresam at gmail.com  Sun May  3 20:49:03 2009
From: doctoresam at gmail.com (Deep_Feelings)
Date: Sun, 3 May 2009 17:49:03 -0700 (PDT)
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
	<gtldqb$91p$1@lust.ihug.co.nz>
Message-ID: <597f14c1-981c-4b94-a64b-a0a96f35f574@e14g2000vbe.googlegroups.com>

On May 4, 3:44?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message
> <deb7353b-19f7-48d7-9777-92b02eed7... at r3g2000vbp.googlegroups.com>,
>
> Deep_Feelings wrote:
> > Do you think python online docs are good starting point for me?
>
> Why not try them and see?

thank you

should i try them then after a month of reading i discover that they
are - for example - not suitable for beginners OR should i ask here
first ? :)


From matt at tplus1.com  Sun May  3 21:04:31 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Mon, 04 May 2009 01:04:31 GMT
Subject: How to walk up parent directories?
Message-ID: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>

Is there already a tool in the standard library to let me walk up from a
subdirectory to the top of my file system?

In other words, I'm looking for something like:

    >>> for x in walkup('/home/matt/projects'):
    ...     print(x)
    /home/matt/projects
    /home/matt
    /home
    /

I know I could build something like this with various os.path
components, but I'm hoping I don't have to.

TIA


Matt


From ben+python at benfinney.id.au  Sun May  3 21:05:14 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 04 May 2009 11:05:14 +1000
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
	<gtldqb$91p$1@lust.ihug.co.nz>
	<597f14c1-981c-4b94-a64b-a0a96f35f574@e14g2000vbe.googlegroups.com>
Message-ID: <87vdohk791.fsf@benfinney.id.au>

Deep_Feelings <doctoresam at gmail.com> writes:

> should i try them then after a month of reading i discover that they
> are - for example - not suitable for beginners OR should i ask here
> first ? :)

You should take on the task of educating yourself. The official Python
docs are an excellent resource. If you're self-admittedly someone who
gets bored quickly, though, that's not a problem anyone but you can
solve.

-- 
 \      ?It seems intuitively obvious to me, which means that it might |
  `\                                           be wrong.? ?Chris Torek |
_o__)                                                                  |
Ben Finney


From gokhansever at gmail.com  Sun May  3 21:21:27 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Sun, 3 May 2009 20:21:27 -0500
Subject: python docs for beginner programmer?
In-Reply-To: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
Message-ID: <49d6b3500905031821w557a8d08m3bcb65b5ae74068a@mail.gmail.com>

Hey,

I am a person who gets bored too quickly, too especially reading
technical materials, and if the author(s) have the habit of wondering
off the subject often. So far, I like Wesley Chun's Core Python book
the most as a Python beginner like you. He also has video training
material on the same subject. Easy to read, very well explanations and
good chosen examples...

That said, after getting a few months of familiarity, I want to get
into the roots of the Python. So where else could be the best choice
but the actual language user guide and reference manual :)

Enjoy your Python programming adventures...

G?khan



On Sun, May 3, 2009 at 7:41 PM, Deep_Feelings <doctoresam at gmail.com> wrote:
> Starting to learn python and because i don't want to read something
> twice (i get bored quickly) i need a source to learn python that is as
> comprehensive as possible.
>
>
> Do you think python online docs are good starting point for me? ( i
> experience with other programming languages ) or should i get giant
> book or something ?
>
> thankx
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From ben+python at benfinney.id.au  Sun May  3 21:24:59 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 04 May 2009 11:24:59 +1000
Subject: How to walk up parent directories?
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
Message-ID: <87ocu9k6c4.fsf@benfinney.id.au>

Matthew Wilson <matt at tplus1.com> writes:

> Is there already a tool in the standard library to let me walk up from
> a subdirectory to the top of my file system?

Sounds like a pretty seldom-needed task, with an implementation simple
using the existing standard library parts.

> In other words, I'm looking for something like:
> 
>     >>> for x in walkup('/home/matt/projects'):
>     ...     print(x)
>     /home/matt/projects
>     /home/matt
>     /home
>     /

    >>> import os.path
    >>> def walkup(path):
    ...     at_top = False
    ...     while not at_top:
    ...         yield path
    ...         parent_path = os.path.dirname(path)
    ...         if parent_path == path:
    ...             at_top = True
    ...         else:
    ...             path = parent_path
    ... 
    >>> for dir in walkup('/home/matt/projects'):
    ...     print dir
    ... 
    /home/matt/projects
    /home/matt
    /home
    /

> I know I could build something like this with various os.path
> components, but I'm hoping I don't have to.

Not every simple function belongs in the standard library :-)

-- 
 \        ?Ubi dubium, ibi libertas.? (?Where there is doubt, there is |
  `\                                                        freedom.?) |
_o__)                                                                  |
Ben Finney


From kirby.urner at gmail.com  Sun May  3 21:30:35 2009
From: kirby.urner at gmail.com (kirby.urner at gmail.com)
Date: Sun, 3 May 2009 18:30:35 -0700 (PDT)
Subject: pythonic chew toyz (continued)
Message-ID: <7f96ae2f-a51c-4760-a135-38d18945b42e@d38g2000prn.googlegroups.com>

On Sun, May 3, 2009 at 5:52 PM, kirby <kirby.urner at gmail.com> wrote:

> From: "kirby.ur... at gmail.com" <kirby.ur... at gmail.com>
> Date: Jan 14, 2:18 pm
> Subject: pythonic chew toyz (a column, by K. Urner) v.1 n.1
> To: comp.lang.python
>
>
> Selena spotted me right away as "the O'Reilly spy", me agreeing she
> had an exceptionally good memory, maybe we could recruit her?  Our
> banter traces to the first meeting on OS Bridge and how I introduced
> myself [0], not yet realizing Allison Randal was in the audience (way
> more an insider, as to how many Ls in Randall).[1]
>

Selena kindly welcomed us into her home for an OS Bridge meeting
awhile back, where we tackled the daunting task of sorting through a
great many interesting proposals, mine barely squeaking by (yes, helps
to have a self interested party at the table, I don't deny it).
Audrey was a strong advocate for Allison Randal's getting to speak,
but of course that's a shoe in.  I'm more the maverick, not having
invented any virtual machines yet, just a lot of verbiage mostly, with
source code sprinkled in (syntactic sugar we call it).

Selena is a Postgres jock many of you may already know.
http://www.chesnok.com/daily/  Take a look for news on the new Sun -
Oracle merger (yes we know, MySQL).  Audrey is with our Legion of Tech
especially in the Rails community (which Kaplan-Moss said some nice
things about).  Together these two are anchoring OS Bridge, our new
Open Source conference in Oregon, the Pacific Northwest always in the
mood for some big geeky festival, with lots of fun themes, like FOSS
on the Farm.  http://opensourcebridge.org/sessions/240

> Last night in the Roman room (CubeSpace) I proposed she could emcee
> the panel we're planning (maybe?), after the new Mayor (Sam Adams)
> kicks it off with a keynote -- all in the proposal stage, looking over
> her shoulder.
>

Sam got rather famous after I posted this or was it before I forget,
but a Wild West town like ours is supposed to go overboard into
various forms of burlesque, player piano optional, maybe a few head
turning cross-dressers (truly, PDX is proud of its heritage, think our
airport is pretty spiffy, plus Ikea, other destinations, take the Max,
Go By Train, very green).

> I was also there for the __metaclasses__ discussion by John Melesky,
> and for work, most of that same day (this is PDX CubeSpace, a lot of
> us rent office space).  Jason talked about the __missing__ rib (in
> dict).[2]
>
> As we were getting settled, they talked about OSCON, perking my
> interest.  Whereas some take the view we're somehow competing with San
> Jose (where some of my friends work, or worked in the case of Maxtor
> and IBM), my model is more Cirque du Soleil, given where "geeks" come
> from (something about chickens).[3]
>

I haven't decided about OSCON yet, would love to go, love the show,
but this retarded economy has me showing my bank every move, no
suitcases of cash like before (just kidding).

Seriously, that O'Reilly School of Technology guy was like "we're
gonna miss the free beer" referring to sometimes generous Alaska
airlines people, maybe Frontier I don't know, giving passengers an up
front taste for our offerings, this being not only a FOSS capital, per
CSM 2005, but a Beer Capital as well (funny how these go together hand
in glove -- no tap at Free Geek though, whereas at Cubespace it's like
50% foam).

Anyway, I've heard many wonderful things about San Jose and will say
this first hand:  the Silicon Valley is not our enemy, nor is the
Silicon Hills (Austin), so there, you have it in writing.

> Five OSCONs running in parallel in any given summer would make more
> sense than just one, but then O'Reilly isn't quite as big as McGraw-
> Hill (BYTE), yet.  Anyway, Portland is happy to share the glory.  OS
> Bridge is yet another bulb on the breadboard (aka grid), getting
> brighter by the day.
>
> Speaking of BYTE, I also learned last night that Eliza, our geek
> therapist, is alive and well in Python, as a part of the Natural
> Language Toolkit or NLTK.  And she's got company.  Some of you may
> recall Hugh Kenner's hilarious investigation of chat bots, then very
> new, in a way back issue (1980s).[4]
>

I tried to get Nat Bobbitt interested in this but he said "no more
comms" perhaps being strategic, time will tell.  I admit to not
following through either, making Sun Tzu and Eliza have conversational
intercourse, a great high school project, and now we have a Watcher
between Pycons -- Vern Ceder, tasked with scoping out talent,
Pythonistas too young for a Pycon maybe (Hyatts pretty racy, lots of
alcoholic beverages), but still able to exhibit in a poster session,
perhaps with a teacher as stand in, proud for the whole school (Python
Teacher of the Year?) -- we'll have someone for high schools to
contact (soon).  Check edu-sig archives for more data.

edu-sig @ Python.org web page was transitioned to our university
president in residence, Dr. Crunchy (yes, an alias), should have some
contact info by summer.  Ramping up slowly, as Pycon is traditionally
business oriented, into planning and doing things right (thx to CTE
this year, also on the job for DjangoConf per this guy's sources --
make a space for September).

> Hugh, by the way, was a leading 20th century James Joyce scholar and
> fan of R. Buckminster Fuller (see 'The Pound Era'), Bucky a champion
> for me as well (hence my rbf.py -- named after the guy, for use with
> VPython, POV-Ray, x3d etc., more on edu-sig).
>
> I'll catch up again later, maybe from Chicago, maybe before.[5]
>

So yeah, Chicago was great.  Too much for one Chew Toyz (the name of
this column), so I'll say some more later, haven't finished watching
all the Blip TVs yet.  Loved 'Designing Django' by Kaplan-Moss,
forwarded to __CHR__ as exemplary of professional (and fun).[0]  My
talk cost extra so don't expect to see the whole thing on Blip, co-
presented with Holden (holdenweb.com), with "Dr. Ian" contributing a
short video re Diffie-Hellman-Merkle (I mostly did RSA because that's
how we do it in Portland so far (wave to Lionel [1])).

Kirby

Cc:  http://osgarden.appspot.com/motd.html

[0]  http://pycon.blip.tv/file/1957605/
[1]  http://worldgame.blogspot.com/2009/03/spring-equinox-2009.html


> [0]http://mail.python.org/pipermail/portland/2008-November/000512.html
> [1]http://radar.oreilly.com/allison/
> [2]http://mybizmo.blogspot.com/2009/01/ppug-2009113.html
> [3]http://worldgame.blogspot.com/2007/06/pro-python-propaganda.html
> [4]http://mathforum.org/kb/message.jspa?messageID=5256703&tstart=0
> [5]http://showmedo.com/videos/video?name=1010050&fromSeriesID=101
>
> [ 2nd edition: reformatted, fixed endnotes ]
>
> << with thanks to verizon wireless >>



From ebonak at hotmail.com  Sun May  3 21:41:23 2009
From: ebonak at hotmail.com (Esmail)
Date: Sun, 03 May 2009 21:41:23 -0400
Subject: for with decimal values?
In-Reply-To: <op.utdo7jajx6zn5v@gabriel.sleipnir-bsas>
References: <mailman.4975.1241277173.11746.python-list@python.org>	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
	<op.utdo7jajx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <gtlh43$7eg$1@ger.gmane.org>

Gabriel Genellina wrote:
> 
> Isn't so easy. You have representation errors and rounding errors here, 
> and they accumulate. The last number printed should be 10.4 but I get 10.5:
> ...
> 10.3
> 10.4
> 10.5
> (or more precisely, 10.499999999999959)
> 
> Also, after exiting a for loop, the *last* value used is retained. In 
> your while loop, the ctr variable contains the *next* value.


All this discussion makes me wonder if it would be a good idea
for Python to have this feature (batteries included and all) - it
would have its uses, no?



From ben+python at benfinney.id.au  Sun May  3 21:58:12 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 04 May 2009 11:58:12 +1000
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
	<op.utdo7jajx6zn5v@gabriel.sleipnir-bsas>
	<mailman.5022.1241401297.11746.python-list@python.org>
Message-ID: <87fxflk4sr.fsf@benfinney.id.au>

Esmail <ebonak at hotmail.com> writes:

> All this discussion makes me wonder if it would be a good idea
> for Python to have this feature (batteries included and all) - it
> would have its uses, no?

What feature are you referring to? Python already has fixed-point
decimal values in the ?decimal.Decimal? type, if that's what you mean.

-- 
 \          ?I spent all my money on a FAX machine. Now I can only FAX |
  `\                                          collect.? ?Steven Wright |
_o__)                                                                  |
Ben Finney


From ross.jett at gmail.com  Sun May  3 22:36:35 2009
From: ross.jett at gmail.com (Ross)
Date: Sun, 3 May 2009 19:36:35 -0700 (PDT)
Subject: Code works fine except...
Message-ID: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>

For the past couple weeks, I've been working on an algorithm to
schedule tennis leagues given court constraints and league
considerations (i.e. whether it's a singles or a doubles league). Here
were my requirements when I was designing this algorithm:

-Each player plays against a unique opponent each week.
-Similarly, in a doubles league, each player plays with a unique
partner each week.
-Each player gets a fair number of bye weeks (i.e. the player with the
most bye weeks will have no more than one bye week than the player
with the least number of bye weeks)

I'm very close to arriving at my desired solution, but I have one
glaring flaw. When I have an even number of players sign up for my
league and there are court constraints, my current algorithm gives the
first player in my league a bye week every single week. I'll post my
code below and see how you guys think I should add to/ amend my code.

def round_robin(players, rounds):
    if len(players)%2:
	players.insert(0, None)
    mid = len(players)//2
    for i in range(rounds):
	yield zip(players[:mid], players[mid:])
	players = players[0:1] + players[mid:mid+1] + players[1:mid-1] +
players[mid+1:] + players[mid-1:mid]


def test_round_robin(players, rounds, courts, doubles = False):
    players = range(players)
    for week in round_robin(players,rounds,courts):
	    if doubles == True:
		    doubles_week = len(week)/2.0
		    byes = doubles_week - courts
		    if byes == 0:
			    bye_list = []
		    else:
			    bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
		    playing = [u for u in week if u not in bye_list]
		    midd = len(playing)//2
		    doub_sched = zip(playing[:midd], playing[midd:])
		    print doub_sched, bye_list
	    else:
		    byes = len(week)- courts
		    if byes == 0:
			    bye_list = []
		    else:
			    bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
		    playing = [u for u in week if u not in bye_list]
		    print playing, bye_list


From wuwei23 at gmail.com  Sun May  3 22:48:20 2009
From: wuwei23 at gmail.com (alex23)
Date: Sun, 3 May 2009 19:48:20 -0700 (PDT)
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org> 
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com> 
	<op.utdo7jajx6zn5v@gabriel.sleipnir-bsas>
	<mailman.5022.1241401297.11746.python-list@python.org>
Message-ID: <e9939643-a961-4a85-9436-2f9e6a1b0fbd@y33g2000prg.googlegroups.com>

On May 4, 11:41?am, Esmail <ebo... at hotmail.com> wrote:
> All this discussion makes me wonder if it would be a good idea
> for Python to have this feature (batteries included and all) - it
> would have its uses, no?

Well, sometimes more discussion == less consensus :)

But it's really easy to roll your own:

from decimal import Decimal

def args2dec(fn):
    '''*args to Decimal decorator'''
    float2dec = lambda f: Decimal(str(f))
    def _args2dec(*args):
        args = map(float2dec, args)
        return fn(*args)
    return _args2dec

@args2dec
def drange(start, stop, step):
    while start < stop:
        yield start
        start += step



From clp2 at rebertia.com  Sun May  3 23:29:22 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 3 May 2009 20:29:22 -0700
Subject: Code works fine except...
In-Reply-To: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
Message-ID: <50697b2c0905032029g7b0009a6ia191be312119b5d3@mail.gmail.com>

On Sun, May 3, 2009 at 7:36 PM, Ross <ross.jett at gmail.com> wrote:
> For the past couple weeks, I've been working on an algorithm to
> schedule tennis leagues given court constraints and league
> considerations (i.e. whether it's a singles or a doubles league). Here
> were my requirements when I was designing this algorithm:
>
> -Each player plays against a unique opponent each week.
> -Similarly, in a doubles league, each player plays with a unique
> partner each week.
> -Each player gets a fair number of bye weeks (i.e. the player with the
> most bye weeks will have no more than one bye week than the player
> with the least number of bye weeks)
>
> I'm very close to arriving at my desired solution, but I have one
> glaring flaw. When I have an even number of players sign up for my
> league and there are court constraints, my current algorithm gives the
> first player in my league a bye week every single week. I'll post my
> code below and see how you guys think I should add to/ amend my code.
>
> def round_robin(players, rounds):
> ? ?if len(players)%2:
> ? ? ? ?players.insert(0, None)
> ? ?mid = len(players)//2
> ? ?for i in range(rounds):
> ? ? ? ?yield zip(players[:mid], players[mid:])
> ? ? ? ?players = players[0:1] + players[mid:mid+1] + players[1:mid-1] +
> players[mid+1:] + players[mid-1:mid]
>
>
> def test_round_robin(players, rounds, courts, doubles = False):
> ? ?players = range(players)
> ? ?for week in round_robin(players,rounds,courts):
> ? ? ? ? ? ?if doubles == True:
> ? ? ? ? ? ? ? ? ? ?doubles_week = len(week)/2.0
> ? ? ? ? ? ? ? ? ? ?byes = doubles_week - courts
> ? ? ? ? ? ? ? ? ? ?if byes == 0:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ?bye_list = []
> ? ? ? ? ? ? ? ? ? ?else:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ?bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
> ? ? ? ? ? ? ? ? ? ?playing = [u for u in week if u not in bye_list]
> ? ? ? ? ? ? ? ? ? ?midd = len(playing)//2
> ? ? ? ? ? ? ? ? ? ?doub_sched = zip(playing[:midd], playing[midd:])
> ? ? ? ? ? ? ? ? ? ?print doub_sched, bye_list
> ? ? ? ? ? ?else:
> ? ? ? ? ? ? ? ? ? ?byes = len(week)- courts
> ? ? ? ? ? ? ? ? ? ?if byes == 0:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ?bye_list = []
> ? ? ? ? ? ? ? ? ? ?else:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ?bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
> ? ? ? ? ? ? ? ? ? ?playing = [u for u in week if u not in bye_list]
> ? ? ? ? ? ? ? ? ? ?print playing, bye_list

Probably not the cause of the problem, but where did the magic numbers
1.072 and 1.08 come from?

Cheers,
Chris
-- 
http://blog.rebertia.com


From sjmachin at lexicon.net  Sun May  3 23:29:46 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 3 May 2009 20:29:46 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
Message-ID: <a4aadd59-1d8a-40e0-b69d-d1d0ef9e01cf@x31g2000prc.googlegroups.com>

On May 4, 12:36?pm, Ross <ross.j... at gmail.com> wrote:
> For the past couple weeks, I've been working on an algorithm to
> schedule tennis leagues given court constraints and league
> considerations (i.e. whether it's a singles or a doubles league). Here
> were my requirements when I was designing this algorithm:
>
> -Each player plays against a unique opponent each week.
> -Similarly, in a doubles league, each player plays with a unique
> partner each week.
> -Each player gets a fair number of bye weeks (i.e. the player with the
> most bye weeks will have no more than one bye week than the player
> with the least number of bye weeks)
>
> I'm very close to arriving at my desired solution, but I have one
> glaring flaw. When I have an even number of players sign up for my
> league and there are court constraints, my current algorithm gives the
> first player in my league a bye week every single week. I'll post my
> code below and see how you guys think I should add to/ amend my code.
>
> def round_robin(players, rounds):
> ? ? if len(players)%2:
> ? ? ? ? players.insert(0, None)
> ? ? mid = len(players)//2
> ? ? for i in range(rounds):
> ? ? ? ? yield zip(players[:mid], players[mid:])
> ? ? ? ? players = players[0:1] + players[mid:mid+1] + players[1:mid-1] +
> players[mid+1:] + players[mid-1:mid]
>
> def test_round_robin(players, rounds, courts, doubles = False):
> ? ? players = range(players)

DON'T change the type/contents/meaning of a variable name like that.
E.g. use "nthings" for a number of things and "things" for a
collection of things.

> ? ? for week in round_robin(players,rounds,courts):

The round_robin() function has only TWO arguments. This code won't
even run.

When you document neither your data structures nor what your functions
are intended to do, the last hope for somebody trying to make sense of
your code is to give meaningful names to your variables. "week" and
"doubles_week" are NOT meaningful.

> ? ? ? ? ? ? if doubles == True:

Bletch. s/ == True//


> ? ? ? ? ? ? ? ? ? ? doubles_week = len(week)/2.0

I doubt very much that using floating point is a good idea here.

> ? ? ? ? ? ? ? ? ? ? byes = doubles_week - courts
> ? ? ? ? ? ? ? ? ? ? if byes == 0:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = []
> ? ? ? ? ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = week[::int(round(1.072*(courts/byes)+1.08))]

The derivation of the constants 1.072 and 1.08 is .... what?

> ? ? ? ? ? ? ? ? ? ? playing = [u for u in week if u not in bye_list]
> ? ? ? ? ? ? ? ? ? ? midd = len(playing)//2
> ? ? ? ? ? ? ? ? ? ? doub_sched = zip(playing[:midd], playing[midd:])
> ? ? ? ? ? ? ? ? ? ? print doub_sched, bye_list
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? byes = len(week)- courts
> ? ? ? ? ? ? ? ? ? ? if byes == 0:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = []
> ? ? ? ? ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
> ? ? ? ? ? ? ? ? ? ? playing = [u for u in week if u not in bye_list]
> ? ? ? ? ? ? ? ? ? ? print playing, bye_list



From gallium.arsenide at gmail.com  Sun May  3 23:32:02 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Sun, 3 May 2009 20:32:02 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
Message-ID: <a0420fb7-8395-48ed-98e8-4f3a01493116@r34g2000vba.googlegroups.com>

On May 3, 10:36?pm, Ross <ross.j... at gmail.com> wrote:

> def round_robin(players, rounds):
[snip]

>
> def test_round_robin(players, rounds, courts, doubles = False):
> ? ? players = range(players)
> ? ? for week in round_robin(players,rounds,courts):
[snip]

First things first:  I take it the call to round_robin is only
supposed to take two parameters?  Or do you have a version that takes
3?

John


From isgrey at gmail.com  Sun May  3 23:47:20 2009
From: isgrey at gmail.com (Ioannis Lalopoulos)
Date: Sun, 3 May 2009 20:47:20 -0700 (PDT)
Subject: Tkinter, Trouble with Message,Label widget
References: <mailman.5017.1241392410.11746.python-list@python.org>
Message-ID: <4f61c431-1c78-4de7-9b82-08eee09ae7d6@s20g2000vbp.googlegroups.com>

I assume that you create the two windows through two different calls
to Tkinter.Tk() but you cannot enter two mainloops (at least not in a
normal way).

If you want a second window use the Toplevel widget.

Try the following, it does what you want:

import Tkinter

root = Tkinter.Tk()

my_text = Tkinter.StringVar(root)

another_window = Tkinter.Toplevel()

entry = Tkinter.Entry(root, textvar=my_text)
entry.pack()

label = Tkinter.Label(another_window, textvar=my_text)
label.pack()

root.mainloop()

In the above example, whatever you type in the entry widget in the
root window gets reflected in the label widget which is inside the
second window, the one that was created with Tkinter.Toplevel().

Hope it helps,

John


From research at johnohagan.com  Mon May  4 00:26:15 2009
From: research at johnohagan.com (John O'Hagan)
Date: Mon, 4 May 2009 04:26:15 +0000
Subject: object query assigned variable name?
In-Reply-To: <200905020422.20895.research@johnohagan.com>
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
	<200905020422.20895.research@johnohagan.com>
Message-ID: <200905040426.15958.research@johnohagan.com>

On Sat, 2 May 2009, John O'Hagan wrote:
> On Fri, 1 May 2009, warpcat wrote:

[...]

> > Given an object:
> >
> > class Spam(object):
> >     def __init__(self):
> >         # stuff....
> >
> > I'd like it to print, when instanced, something like this:
> > >>> s = Spam()
> >
> > I?m assigned to s!
>
> If you just want the names an instance has in a given namespace, you could
> give your class a method like:
>
> class KnowNames(object):
>     def get_names(self, namespace):
>         id_str = str(hex(id(self))[:-1])
>         return [i for i in namespace if id_str in str(namespace[i])]
>
> which will give you a list of names when called on an instance.

And which is a silly way of saying:

class KnowName(object):
    def get_names(self, namespace):
        return [i for i in namespace if namespace[i] is self]

removing four function calls, an assignment and a slicing operation from a 
mere two lines; certainly a personal best for insanely over-wrought code!

Oops. :) ,

John


From kyrie at uh.cu  Mon May  4 00:38:42 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Mon, 04 May 2009 00:38:42 -0400
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <20090501052226.GA6860@cskk.homeip.net>
References: <20090501052226.GA6860@cskk.homeip.net>
Message-ID: <1241411922.49fe715207236@mail.uh.cu>


Quoting Cameron Simpson <cs at zip.com.au>:

> | And as it happens I have an IterableQueue class right here which does
> | _exact_ what was just described. You're welcome to it if you like.
> | Added bonus is that, as the name suggests, you can use the class as
> | an iterator:
> |   for item in iterq:
> |     ...
> | The producer calls iterq.close() when it's done.
> 
> Someone asked, so code appended below.
> [...]

Thank you!. I tested it, and it seems to work... and having the queue be an
iterable is a plus. Thank you, Cameron & MRAB!

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie

-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From kyrie at uh.cu  Mon May  4 00:56:26 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Mon, 04 May 2009 00:56:26 -0400
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <001201c9ca39$b9c4d140$0d00a8c0@Hendrik>
References: <200904301649.10341.kyrie@uh.cu>
	<001201c9ca39$b9c4d140$0d00a8c0@Hendrik>
Message-ID: <1241412986.49fe757a94f93@mail.uh.cu>


Quoting Hendrik van Rooyen <mail at microcorp.co.za>:

>  "Luis Zarrabeitia" <akakyrie at uh.cu> wrote:
> 
> 8< -------explanation and example of one producer, --------
> 8< -------more consumers and one queue --------------------
> 
> >As you can see, I'm sending one 'None' per consumer, and hoping that no 
> >consumer will read more than one None. While this particular implementation
> 
> 
> You don't have to hope. You can write the consumers that way to guarantee
> it.

I did. But that solution is not very reusable (I _must_ remember that
implementation detail every time) and most important, i'll have to remember it
in a few months with I'm updating the code.


> >ensures that, it is very fragile. Is there any way to signal the consumers?
>  
> Signalling is not easy - you can signal a process, but I doubt if it is 
> possible to signal a thread in a process.
> 
> >(or better yet, the queue itself, as it is shared by all consumers?) 
> >Should "close" work for this? (raise the exception when the queue is 
> >exhausted, not when it is closed by the producer).
> 
> I haven't the foggiest if this will work, and it seems to me to be kind
> of involved compared to passing a sentinel or sentinels.

Well, that would be a vaild signal. Too bad I have to pass it by hand, instead
of the queue class taking care of it for me.

> I have always wondered why people do the one queue many getters thing.
> 
> Given that the stuff you pass is homogenous in that it will require a
> similar amount of effort to process, is there not a case to be made
> to have as many queues as consumers, and to round robin the work?

Abstraction. This problem is modeled nicely as a producer-consumer (it would be
in fact a classic producer-consumer). I could take care of the scheduling
myself, but there are already good scheduling algorithms written for my OS, that
take into account both the available CPU and IO.

A solution may not be a queue (in my case, I don't care the order in which the
elements are processed, only that they are), but ideally I would just be
'yielding' results on my producer(s), and receiving them on my consumer(s),
leaving the IPC mechanism to deal with how to move the data from producers to
consumers (and to which consumers).

> And if the stuff you pass around needs disparate effort to consume,
> it seems to me that you can more easily balance the load by having
> specialised consumers, instead of instances of one humungous 
> "I can eat anything" consumer.

Not necessarily. The load may depend on the size of the data that was sent. The
consumers are receiving the same kind of data, only the sizes are different
(non-predictable different). Again, I could try to implement some heuristics to
try and guess what processor has lower load, but I'd rather delegate that to the OS.

> I also think that having a queue per consumer thread makes it easier
> to replace the threads with processes and the queues with pipes or
> sockets if you need to do serious scaling later.

This is already multiprocess. It could be nice to extend it to multi-computers
later, but the complexity is not worth it right now.

> In fact I happen to believe that anything that does any work needs 
> one and only one input queue and nothing else, but I am peculiar
> that way.

Well, I also need some output. In my case, the outputs are files with the result
of the processing, that can be summarized later (hence the need to 'join' the
processes, to know when I can summarize them).

Thank you.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie

-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From kyrie at uh.cu  Mon May  4 01:02:36 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Mon, 04 May 2009 01:02:36 -0400
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <aY2dnRrlQaxfLGHUnZ2dnUVZ_h6dnZ2d@earthlink.com>
References: <mailman.4864.1241124562.11746.python-list@python.org>
	<aY2dnRrlQaxfLGHUnZ2dnUVZ_h6dnZ2d@earthlink.com>
Message-ID: <1241413356.49fe76ec17c83@mail.uh.cu>


Quoting Dennis Lee Bieber <wlfraed at ix.netcom.com>:

> 	I'm not familiar with the multiprocessing module and its queues but,
> presuming it behaves similar to the threading module AND that you have
> design control over the consumers (as you did in the sample) make a
> minor change.
> 
> 	queue.put(None)	ONCE in the producer
> 
> 	Then, in the consumer, after it sees the None and begins shutdown
> processing, have the consumer ALSO do
> 
> 	queue.put(None)
> 

Thank you. I went with this idea, only that instead of modifying the consumer, I
modified the queue itself... Well, Cameron Simpson did :D. It's working nicely now.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie

-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From gallium.arsenide at gmail.com  Mon May  4 01:16:20 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Sun, 3 May 2009 22:16:20 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
Message-ID: <7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>

On May 3, 11:29 pm, Chris Rebert <c... at rebertia.com> wrote:

> Probably not the cause of the problem, but where
> did the magic numbers 1.072 and 1.08 come from?

It is perhaps not the most direct cause of the problem, in the sense
that the magic numbers could take various values and the problem would
still be there.  But the magic numbers appear to be used for
"spreading out" bye selection, and that's broken.

The extended slice as written will always pick the first element,
since the step is guaranteed to be positive.  Since the first player
(or None, when there are an odd number of players) stays put in the
first position during the round_robin shuffle, that player will always
be selected for a bye.

Further, as written, the calculated number of byes has no bearing on
the actual number of byes selected.

I think what I would do is adjust the shuffling algorithm in such a
way that everyone moves through the various positions in the list
(would it be as simple as adding a shift at the end of
round_robin???).  Then I could simply select the byes from one end of
the list (with a regular slice instead of an extended slice).

John


From rylesny at gmail.com  Mon May  4 01:21:31 2009
From: rylesny at gmail.com (rylesny at gmail.com)
Date: Sun, 3 May 2009 22:21:31 -0700 (PDT)
Subject: Multiprocessing.Queue - I want to end.
References: <mailman.4864.1241124562.11746.python-list@python.org> 
	<2759676b-952a-46d0-a766-334782794984@o18g2000yqi.googlegroups.com>
Message-ID: <eb743022-027b-4c42-bc1c-ae716714bb2c@u10g2000vbd.googlegroups.com>

> You may have to write the consumer loop by hand, rather than using
> 'for'. ?In the same-process case, you can do this.
>
> producer:
> sentinel= object( )
>
> consumer:
> while True:
> ? item= queue.get( )
> ? if item is sentinel:
> ? ? break
> ? etc.
>
> Then, each consumer is guaranteed to consume no more than one
> sentinel, and thus producing one sentinel per consumer will halt them
> all.
>
> However, with multiple processes, the comparison to 'sentinel' will
> fail, since each subprocess gets a copy, not the original, of the
> sentinel.

Rather than use object() you can create a type whose instances are
equal.

class Stopper(object):
    def __eq__(self, other):
        return type(other) == type(self)

producer's stop():
  queue.put(Stopper())

consumers main loop:
  for item in iter(queue.get, Stopper()):
      ...


From icebergwtf at gmail.com  Mon May  4 01:21:59 2009
From: icebergwtf at gmail.com (tiefeng wu)
Date: Mon, 4 May 2009 13:21:59 +0800
Subject: smtplib send email by using gmail smtp server
In-Reply-To: <op.utc8o5g6x6zn5v@gabriel.sleipnir-bsas>
References: <4314c1f70905030818y73809e16s45e04f8edb5ce714@mail.gmail.com>
	<op.utc8o5g6x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <4314c1f70905032221j61ed1e3bka6222edf1d1ab1@mail.gmail.com>

>
> I've tested with 3.0.1 on Windows XP and worked fine. Seems to be a problem
> in the SSL support, but that's all I could say.
>
> --
> Gabriel Genellina
>

thanks, I'll check SSL support on my system

Tiefeng Wu
2009-05-04
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From ur.liam at iksmlapan.reverse  Mon May  4 01:28:28 2009
From: ur.liam at iksmlapan.reverse (Napalmski)
Date: Mon, 4 May 2009 06:28:28 +0100
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
	<gtldqb$91p$1@lust.ihug.co.nz>
	<597f14c1-981c-4b94-a64b-a0a96f35f574@e14g2000vbe.googlegroups.com>
	<87vdohk791.fsf@benfinney.id.au>
Message-ID: <MPG.24688d4eea1aa666989682@eu.news.astraweb.com>

In article <87vdohk791.fsf at benfinney.id.au>, ben+python at benfinney.id.au 
says...
> 
> Deep_Feelings <doctoresam at gmail.com> writes:
> 
> > should i try them then after a month of reading i discover that they
> > are - for example - not suitable for beginners OR should i ask here
> > first ? :)
> 
> You should take on the task of educating yourself. The official Python
> docs are an excellent resource. If you're self-admittedly someone who
> gets bored quickly, though, that's not a problem anyone but you can
> solve.

Been doing Python for a week or so now and I must agree that the 
official python docs are a fantastic resource.
I'm not sure how good they would be for someone with no previous 
programming language experience but they seem to be pretty thourough, at 
least for one beginning the language.
http://docs.python.org/tutorial/index.html


From alex at bluebottle.net.au  Mon May  4 01:46:06 2009
From: alex at bluebottle.net.au (Alex Jurkiewicz)
Date: Mon, 04 May 2009 13:46:06 +0800
Subject: Threaded alternatives to smtplib?
Message-ID: <49FE811E.8060400@bluebottle.net.au>

Hi all,
I'm writing a Python script to do a "mail merge" style email 
distribution. I create a few python threads and in each one I call 
`smtpserver = smtplib.SMTP(our.smtpserver.com)`. However, during the 
sending process, there seems to be only one connection open to our mail 
server at any one time. In other words, all these threads gain me no 
speed benefit at all!

I seem to be running into the issue where smtplib is not fully 
thread-safe, as mentioned in this thread:
http://mail.python.org/pipermail/python-list/2007-March/429067.html
http://mail.python.org/pipermail/python-list/2007-March/429172.html

Does anyone have suggestions as to a suitable workaround for this issue? 
I was looking at the Twisted library, which seems possible but 
significantly more complex.


Thanks,
Alex Jurkiewicz


From showell30 at yahoo.com  Mon May  4 02:21:10 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 3 May 2009 23:21:10 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<mailman.5019.1241396412.11746.python-list@python.org>
Message-ID: <8629a726-aca4-43c4-a223-ae150944fd58@o27g2000vbd.googlegroups.com>

On May 3, 5:21?pm, Emile van Sebille <em... at fenx.com> wrote:
> On 5/3/2009 3:39 PM bearophileH... at lycos.com said...
>
>
>
> > Sometimes I rename recursive functions, or I duplicate&modify them,
> > and they stop working because inside them there's one or more copy of
> > their old name.
> > This happens to me more than one time every year.
> > So I have written this:
>
> > from inspect import getframeinfo, currentframe
>
> > def SOMEVERYUGLYNAME(n):
> > ? ? if n <= 1:
> > ? ? ? ? return 1
> > ? ? else:
> > ? ? ? ? self_name = getframeinfo(currentframe()).function
> > ? ? ? ? #self_name = getframeinfo(currentframe())[2] # older python
>
> > ? ? ? ? # only if it's a global function
> > ? ? ? ? #return n * globals()[self_name](n - 1)
> > ? ? ? ? return n * eval(self_name + "(%d)" % (n - 1))
> > assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6
>
> > Are there nicer ways to do that?
>
> I've sometimes used classes like:
>
> class SOMEVERYUGLYNAME:
> ? ? ?def __call__(self,n):
> ? ? ? ? ?if n<=1:
> ? ? ? ? ? ? ?return 1
> ? ? ? ? ?else:
> ? ? ? ? ? ? ?return n*self.__class__()(n-1)
>
> assert SOMEVERYUGLYNAME()(6) == 2*3*4*5*6
>
> It's probably nicer (for some definition of nice), but I wouldn't say
> it's nice.
>

Some of that could probably abstracted into a decorator maybe?


From clp2 at rebertia.com  Mon May  4 02:24:40 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 3 May 2009 23:24:40 -0700
Subject: Strange interaction between timeit and recursion
In-Reply-To: <gtm17v$18vn$2@adenine.netfront.net>
References: <00198774$0$9761$c3e8da3@news.astraweb.com>
	<gtm17v$18vn$2@adenine.netfront.net>
Message-ID: <50697b2c0905032324m27fcaa1k90d0407ef4c74adb@mail.gmail.com>

On Sun, May 3, 2009 at 11:27 PM, namekuseijin
<namekuseijin.nospam at gmail.com> wrote:
> Recursion is unpythonic. ?Do not use it.

That's a tad extreme. I think the accepted practice is merely not to
use recursion gratuitously.

Cheers,
Chris
-- 
http://blog.rebertia.com


From namekuseijin.nospam at gmail.com  Mon May  4 02:26:18 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Mon, 04 May 2009 03:26:18 -0300
Subject: Using Help inside Python
In-Reply-To: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>
References: <f67034ee-36e5-4824-9935-e1f6b87734be@y6g2000prf.googlegroups.com>
Message-ID: <gtm158$18vn$1@adenine.netfront.net>

I'm from the time when I inspected python objects themselves, say:

print obj.__doc__
or
dir( obj )

to know the goodies...


From namekuseijin.nospam at gmail.com  Mon May  4 02:27:46 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Mon, 04 May 2009 03:27:46 -0300
Subject: Strange interaction between timeit and recursion
In-Reply-To: <00198774$0$9761$c3e8da3@news.astraweb.com>
References: <00198774$0$9761$c3e8da3@news.astraweb.com>
Message-ID: <gtm17v$18vn$2@adenine.netfront.net>

Recursion is unpythonic.  Do not use it.


From arnodel at googlemail.com  Mon May  4 02:29:29 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 04 May 2009 07:29:29 +0100
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
Message-ID: <m2iqkhnzxy.fsf@googlemail.com>

bearophileHUGS at lycos.com writes:

> Sometimes I rename recursive functions, or I duplicate&modify them,
> and they stop working because inside them there's one or more copy of
> their old name.
> This happens to me more than one time every year.
> So I have written this:
>
> from inspect import getframeinfo, currentframe
>
> def SOMEVERYUGLYNAME(n):
>     if n <= 1:
>         return 1
>     else:
>         self_name = getframeinfo(currentframe()).function
>         #self_name = getframeinfo(currentframe())[2] # older python
>
>         # only if it's a global function
>         #return n * globals()[self_name](n - 1)
>         return n * eval(self_name + "(%d)" % (n - 1))
> assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6
>
> Are there nicer ways to do that? I don't know.
> If there aren't, then a way may be added.
> An idea-syntax:
>
> def fact(n):
>     return 1 if n <= 1 else n * inspect.self(n - 1)
>
> Or even a lambda, because you don't need the name anymore to call the
> function:
>
> fact = lambda n: 1 if n <= 1 else n * self(n - 1)
>
> (If you have two or more recursive functions that call each other this
> idea can't be used, but I think such situations are uncommon enough to
> not deserve help from the language).
>
> Bye,
> bearophile

Here's an idea:

>>> def bindfunc(f):
...     def boundf(*args, **kwargs):
...         return f(boundf, *args, **kwargs)
...     return boundf
... 
>>> @bindfunc
... def fac(self, n):
...     return 1 if n <= 1 else n * self(n - 1)
... 
>>> fac(5)
120
>>> fac = bindfunc(lambda f, n: 1 if n <= 1 else n*f(n - 1))
>>> fac(5)
120

-- 
Arnaud





From clp2 at rebertia.com  Mon May  4 02:31:46 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 3 May 2009 23:31:46 -0700
Subject: Self function
In-Reply-To: <m2iqkhnzxy.fsf@googlemail.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
Message-ID: <50697b2c0905032331s27af9e63t2fcc0a365d24e4ab@mail.gmail.com>

On Sun, May 3, 2009 at 11:29 PM, Arnaud Delobelle
<arnodel at googlemail.com> wrote:
> bearophileHUGS at lycos.com writes:
>
>> Sometimes I rename recursive functions, or I duplicate&modify them,
>> and they stop working because inside them there's one or more copy of
>> their old name.
>> This happens to me more than one time every year.
>> So I have written this:
>>
>> from inspect import getframeinfo, currentframe
>>
>> def SOMEVERYUGLYNAME(n):
>> ? ? if n <= 1:
>> ? ? ? ? return 1
>> ? ? else:
>> ? ? ? ? self_name = getframeinfo(currentframe()).function
>> ? ? ? ? #self_name = getframeinfo(currentframe())[2] # older python
>>
>> ? ? ? ? # only if it's a global function
>> ? ? ? ? #return n * globals()[self_name](n - 1)
>> ? ? ? ? return n * eval(self_name + "(%d)" % (n - 1))
>> assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6
>>
>> Are there nicer ways to do that? I don't know.
>> If there aren't, then a way may be added.
>> An idea-syntax:
>>
>> def fact(n):
>> ? ? return 1 if n <= 1 else n * inspect.self(n - 1)
>>
>> Or even a lambda, because you don't need the name anymore to call the
>> function:
>>
>> fact = lambda n: 1 if n <= 1 else n * self(n - 1)
>>
>> (If you have two or more recursive functions that call each other this
>> idea can't be used, but I think such situations are uncommon enough to
>> not deserve help from the language).
>>
>> Bye,
>> bearophile
>
> Here's an idea:
>
>>>> def bindfunc(f):
> ... ? ? def boundf(*args, **kwargs):
> ... ? ? ? ? return f(boundf, *args, **kwargs)
> ... ? ? return boundf
> ...
>>>> @bindfunc
> ... def fac(self, n):
> ... ? ? return 1 if n <= 1 else n * self(n - 1)
> ...
>>>> fac(5)
> 120
>>>> fac = bindfunc(lambda f, n: 1 if n <= 1 else n*f(n - 1))
>>>> fac(5)
> 120

Why am I reminded of the Y-Combinator...?

Cheers,
Chris
-- 
http://blog.rebertia.com


From namekuseijin.nospam at gmail.com  Mon May  4 02:33:25 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Mon, 04 May 2009 03:33:25 -0300
Subject: yet another list comprehension question
In-Reply-To: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
Message-ID: <gtm1ik$19tj$1@adenine.netfront.net>

 >>> ls = [(1,2), (3,4), (5, None), (6,7), (8, None)]
 >>> [(x,y) for (x,y) in ls if y]
[(1, 2), (3, 4), (6, 7)]



From deets at nospam.web.de  Mon May  4 02:45:17 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 04 May 2009 08:45:17 +0200
Subject: Threaded alternatives to smtplib?
In-Reply-To: <mailman.5028.1241416479.11746.python-list@python.org>
References: <mailman.5028.1241416479.11746.python-list@python.org>
Message-ID: <767h7tF1b8q8gU1@mid.uni-berlin.de>

Alex Jurkiewicz schrieb:
> Hi all,
> I'm writing a Python script to do a "mail merge" style email 
> distribution. I create a few python threads and in each one I call 
> `smtpserver = smtplib.SMTP(our.smtpserver.com)`. However, during the 
> sending process, there seems to be only one connection open to our mail 
> server at any one time. In other words, all these threads gain me no 
> speed benefit at all!
> 
> I seem to be running into the issue where smtplib is not fully 
> thread-safe, as mentioned in this thread:
> http://mail.python.org/pipermail/python-list/2007-March/429067.html
> http://mail.python.org/pipermail/python-list/2007-March/429172.html
> 
> Does anyone have suggestions as to a suitable workaround for this issue? 
> I was looking at the Twisted library, which seems possible but 
> significantly more complex.

I doubt that there is such issue. The above discussion is not concluding 
that there actually *are* threading-issues within smtplib. And looking 
at the source of smtplib, it certainly doesn't use any 
locking-primitives or (directly) any c-extension that might explain such 
behavior.

Without more code, it's impossible to tell if there is anything peculiar 
in your usage of the lib. Maybe you close your connections to fast to 
see several open?

Diez


From deets at nospam.web.de  Mon May  4 02:46:39 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 04 May 2009 08:46:39 +0200
Subject: Strange interaction between timeit and recursion
In-Reply-To: <gtm17v$18vn$2@adenine.netfront.net>
References: <00198774$0$9761$c3e8da3@news.astraweb.com>
	<gtm17v$18vn$2@adenine.netfront.net>
Message-ID: <767hafF1b8q8gU2@mid.uni-berlin.de>

namekuseijin schrieb:
> Recursion is unpythonic.  Do not use it.

Since when? Says who?

Lacking tail-recursion, it's not the choice for loops, but whatever 
algorithm is recursive can be written as such.

Diez


From gagsl-py2 at yahoo.com.ar  Mon May  4 03:05:35 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 04 May 2009 04:05:35 -0300
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
Message-ID: <op.utd8nleux6zn5v@gabriel.sleipnir-bsas>

En Sun, 03 May 2009 21:41:47 -0300, Deep_Feelings <doctoresam at gmail.com>  
escribi?:

> Do you think python online docs are good starting point for me? ( i
> experience with other programming languages ) or should i get giant
> book or something ?

If you have some previous experience with other languages, I think that  
"Dive into Python" would be a good resource.

-- 
Gabriel Genellina



From jussij at zeusedit.com  Mon May  4 03:05:51 2009
From: jussij at zeusedit.com (JussiJ)
Date: Mon, 4 May 2009 00:05:51 -0700 (PDT)
Subject: What IDE support python 3.0.1 ?
References: <e154b479-82a6-4aca-9e7b-687ecabe68c8@e21g2000yqb.googlegroups.com>
	<mailman.3962.1239835547.11746.python-list@python.org>
	<48f7aa16-ea53-4373-817d-a95fdba6e355@3g2000yqk.googlegroups.com>
	<op.usgchrf7a8ncjz@gnudebst>
	<mailman.3975.1239852366.11746.python-list@python.org>
Message-ID: <4199fa56-4228-45bb-b400-6535bdbaaa64@y34g2000prb.googlegroups.com>

On Apr 16, 1:26 pm, Brendon Wickham <brendon.wick... at gmail.com> wrote:

> I agree, no IDE needed. Just don't use Notepad! I'm on Mac, so
> spoiled for choice of text editors, but I'm sure there's one
> or 2 good uns if you're on Windows.

The Zeus for Windows IDE is Python aware:

   http://www.zeusedit.com/python.html

It does syntax highlighting, smart indenting etc. You can even
write Zeus scripts in Python.

Jussi Jumppanen
Author: Zeus for Windows IDE


From alex at bluebottle.net.au  Mon May  4 03:19:21 2009
From: alex at bluebottle.net.au (Alex Jurkiewicz)
Date: Mon, 04 May 2009 15:19:21 +0800
Subject: Threaded alternatives to smtplib?
In-Reply-To: <767h7tF1b8q8gU1@mid.uni-berlin.de>
References: <mailman.5028.1241416479.11746.python-list@python.org>
	<767h7tF1b8q8gU1@mid.uni-berlin.de>
Message-ID: <49FE96F9.3000108@bluebottle.net.au>

Diez B. Roggisch wrote:
> Without more code, it's impossible to tell if there is anything 
> peculiar in your usage of the lib. Maybe you close your connections to 
> fast to see several open?

Here's the relevant stuff from my (python2.6) code:


CONCURRENCY = 3

def threadProcessRecipient():
    # Each thread has its own SMTP connection
    smtpserver = smtplib.SMTP(SMTPSERVER)
   
    # Each thread pulls a recipient entry from the queue to process and 
loops until the queue is empty.
    try:
        recipientData = recipientQueue.get_nowait()
    except Queue.Empty:
        recipientData = None
   
    while recipientData:
        message = prepareMessage()
        sendMail(senderEmail, recipientEmail, message, smtpserver)
       
        recipientQueue.task_done()
        try:
            recipientData = recipientQueue.get_nowait()
        except Queue.Empty:
            recipientData = None
   
    smtpserver.quit()

if __name__ == '__main__':
    THREADS = []
    for i in range(CONCURRENCY):
        THREADS.append(threading.Thread(target=threadProcessRecipient))
    for thread in THREADS:
        thread.run()
    for thread in THREADS:
        thread.join()


From mail at microcorp.co.za  Mon May  4 03:25:16 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 4 May 2009 09:25:16 +0200
Subject: Tkinter, Trouble with Message,Label widget
References: <49FE251C.40103@hughes.net>
Message-ID: <006d01c9cc89$7e3295c0$0d00a8c0@Hendrik>


 "norseman" <n..n at hughes.net> wrote:

> There has to be some way of using a Message or Label (or some) widget as
> a simple posting board.

There is - look at textvariable - an instance of StringVar that is associated
with
the widget.

If all else fails, you can always use configure to change the text...

hth - Hendrik



From gagsl-py2 at yahoo.com.ar  Mon May  4 03:40:34 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 04 May 2009 04:40:34 -0300
Subject: Threaded alternatives to smtplib?
References: <mailman.5028.1241416479.11746.python-list@python.org>
	<767h7tF1b8q8gU1@mid.uni-berlin.de>
	<49FE96F9.3000108@bluebottle.net.au>
Message-ID: <op.utd99wa6x6zn5v@gabriel.sleipnir-bsas>

En Mon, 04 May 2009 04:19:21 -0300, Alex Jurkiewicz  
<alex at bluebottle.net.au> escribi?:
> Diez B. Roggisch wrote:
>> Without more code, it's impossible to tell if there is anything  
>> peculiar in your usage of the lib. Maybe you close your connections to  
>> fast to see several open?
>
> Here's the relevant stuff from my (python2.6) code:
>
>
> CONCURRENCY = 3
>
> def threadProcessRecipient():
>     # Each thread has its own SMTP connection
>     smtpserver = smtplib.SMTP(SMTPSERVER)
>        # Each thread pulls a recipient entry from the queue to process  
> and loops until the queue is empty.
>     try:
>         recipientData = recipientQueue.get_nowait()
>     except Queue.Empty:
>         recipientData = None
>        while recipientData:
>         message = prepareMessage()
>         sendMail(senderEmail, recipientEmail, message, smtpserver)
>                recipientQueue.task_done()
>         try:
>             recipientData = recipientQueue.get_nowait()
>         except Queue.Empty:
>             recipientData = None
>        smtpserver.quit()

Try logging the start/stop of your threads. It may be that your threads  
stop before you think. The above code works correctly only if you fill the  
queue before starting any thread - because as soon as a thread sees the  
queue empty, it finishes.
You could use the sample code in the Queue documentation at the end of  
http://docs.python.org/library/queue.html

-- 
Gabriel Genellina



From hniksic at xemacs.org  Mon May  4 03:53:50 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Mon, 04 May 2009 09:53:50 +0200
Subject: Strange interaction between timeit and recursion
References: <00198774$0$9761$c3e8da3@news.astraweb.com>
Message-ID: <87ws8xe229.fsf@busola.homelinux.net>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

> I don't understand why my recursive function hits the recursion
> limit inside the timeit.Timer when it works outside of it.

Probably because your test function is at the very edge of the
recursion limit, and timeit.Timer triggers it because it calls it at a
deeper stack level than is the case with the interactive prompt.
AFAIK the "recursion limit" simply limits the number of nested
function calls.

> Is there any way to see the current recursion depth at a particular
> moment?

I don't think that's possible from within Python, although maybe it
should be.  The current recursion depth is a simple member of the
thread state structure that could be exposed as a low-level function
that begins with an underscore, similar to sys._getframe.  The
"inspect" module and various debuggers might put it to good use.


From mail at microcorp.co.za  Mon May  4 04:01:23 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 4 May 2009 10:01:23 +0200
Subject: Multiprocessing.Queue - I want to end.
References: <200904301649.10341.kyrie@uh.cu><001201c9ca39$b9c4d140$0d00a8c0@Hendrik>
	<1241412986.49fe757a94f93@mail.uh.cu>
Message-ID: <00a201c9cc8e$89420f40$0d00a8c0@Hendrik>

"Luis Alberto Zarrabeitia Gomez" <kyrie at uh.cu> wrote:

>Quoting Hendrik van Rooyen <mail at microcorp.co.za>:

>> In fact I happen to believe that anything that does any work needs
>> one and only one input queue and nothing else, but I am peculiar
>> that way.
>
>Well, I also need some output. In my case, the outputs are files with the
result
>of the processing, that can be summarized later (hence the need to 'join' the
>processes, to know when I can summarize them).

When you know what you want to do with the output (which
I suspect is your case) then the trick is to put the individual
outputs onto the input queue of the summary process.

This will form a virtual (or real if you have different machines)
systolic array with producers feeding consumers that feed
the summary process, all running concurrently.

Ponder on it that in the description only the word "feed" is used...

And if you don't know where your output must go, then it must be
put onto the input queue of your default router, who must know
what to do with stuff. - this is in a sense what happens when
you pipe stdout to stdin in a *nix environment - you use the OS
to set up a temporary systolic array.

You only need to keep the output of the consumers in files if
you need access to it later for some reason. In your case it sounds
as if you are only interested in the output of the summary.

- Hendrik




From alex at bluebottle.net.au  Mon May  4 04:31:46 2009
From: alex at bluebottle.net.au (Alex Jurkiewicz)
Date: Mon, 04 May 2009 16:31:46 +0800
Subject: Threaded alternatives to smtplib?
In-Reply-To: <op.utd99wa6x6zn5v@gabriel.sleipnir-bsas>
References: <mailman.5028.1241416479.11746.python-list@python.org>	<767h7tF1b8q8gU1@mid.uni-berlin.de>	<49FE96F9.3000108@bluebottle.net.au>
	<op.utd99wa6x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <49FEA7F2.9040605@bluebottle.net.au>

Gabriel Genellina wrote:
> Try logging the start/stop of your threads. It may be that your 
> threads stop before you think. The above code works correctly only if 
> you fill the queue before starting any thread - because as soon as a 
> thread sees the queue empty, it finishes.
> You could use the sample code in the Queue documentation at the end of 
> http://docs.python.org/library/queue.htm
The queue is actually filled before the threads are started, data is 
only removed after they start.

Logging thread state (at least in debug mode) would be good though. How 
would I go about it in this example? The docs suggest using thread.name, 
but in my current setup I don't have any idea which thread is running. 
Something like this:
for i in range(CONCURRENCY):
    THREADS.append( threading.Thread(target=threadProcessRecipient, 
args=i, name=i) )

And:

def threadProcessRecipient(name):
    print "Name is %s" % name


AJ


From deets at nospam.web.de  Mon May  4 05:14:38 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 04 May 2009 11:14:38 +0200
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
	<bea7d12e-2bda-4ec6-868b-440b79bd28e4@21g2000vbk.googlegroups.com>
	<mailman.5014.1241386734.11746.python-list@python.org>
	<4b87a84a-eef0-42cb-91f7-6ade662bdd4d@t10g2000vbg.googlegroups.com>
Message-ID: <767pt4F1ai5lsU1@mid.uni-berlin.de>

CTO wrote:

>> In addition, the zip file format stores the directory at the end of the
>> file. So you can't process it until it's completely downloaded.
>> Concurrency doesn't help here.
> 
> Don't think that's relevant, if I'm understanding the OP correctly.
> Lets say you've downloaded the file once and you're doing whatever
> the app does with it. Now, while that's happening the half an hour
> time limit comes up. Now you want to start another download, but
> you also want to continue to work with the old version. Voila,
> concurrency.

Which brings us backs to the "20 questions"-part of my earlier post. It
could be, but it could also be that processing takes seconds. Or it takes
so long that even concurrency won't help. Who knows?

Diez


From bearophileHUGS at lycos.com  Mon May  4 05:39:40 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 02:39:40 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
Message-ID: <e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>

Arnaud Delobelle:
> >>> def bindfunc(f):
> ... ? ? def boundf(*args, **kwargs):
> ... ? ? ? ? return f(boundf, *args, **kwargs)
> ... ? ? return boundf

> ...>>> @bindfunc
> ... def fac(self, n):
> ... ? ? return 1 if n <= 1 else n * self(n - 1)
> ...>>> fac(5)
> 120

This is cute, now I have two names to take care of.
Thank you to all the people that have answered.
Another possible syntax:

def fact(n):
    return 1 if n <= 1 else n * return(n - 1)

But I guess most people don't see this problem as important&common
enough to justify changing the language.

Bye,
bearophile


From deets at nospam.web.de  Mon May  4 06:52:05 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 04 May 2009 12:52:05 +0200
Subject: Threaded alternatives to smtplib?
References: <mailman.5028.1241416479.11746.python-list@python.org>	<767h7tF1b8q8gU1@mid.uni-berlin.de>	<49FE96F9.3000108@bluebottle.net.au>
	<op.utd99wa6x6zn5v@gabriel.sleipnir-bsas>
	<mailman.5038.1241425914.11746.python-list@python.org>
Message-ID: <767vjrF1bier8U1@mid.uni-berlin.de>

Alex Jurkiewicz wrote:

> Gabriel Genellina wrote:
>> Try logging the start/stop of your threads. It may be that your
>> threads stop before you think. The above code works correctly only if
>> you fill the queue before starting any thread - because as soon as a
>> thread sees the queue empty, it finishes.
>> You could use the sample code in the Queue documentation at the end of
>> http://docs.python.org/library/queue.htm
> The queue is actually filled before the threads are started, data is
> only removed after they start.
> 
> Logging thread state (at least in debug mode) would be good though. How
> would I go about it in this example? The docs suggest using thread.name,
> but in my current setup I don't have any idea which thread is running.
> Something like this:
> for i in range(CONCURRENCY):
>     THREADS.append( threading.Thread(target=threadProcessRecipient,
> args=i, name=i) )
> 
> And:
> 
> def threadProcessRecipient(name):
>     print "Name is %s" % name

Each thread gets an unique name assigned anyway. Alternatively, you can use
partial to bind parameters to functions. And last but not least to subclass
Thread is also an option.

Diez


From deets at nospam.web.de  Mon May  4 06:55:34 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 04 May 2009 12:55:34 +0200
Subject: Threaded alternatives to smtplib?
References: <mailman.5028.1241416479.11746.python-list@python.org>	<767h7tF1b8q8gU1@mid.uni-berlin.de>	<49FE96F9.3000108@bluebottle.net.au>
	<op.utd99wa6x6zn5v@gabriel.sleipnir-bsas>
	<mailman.5038.1241425914.11746.python-list@python.org>
	<767vjrF1bier8U1@mid.uni-berlin.de>
Message-ID: <767vqcF1bd5b4U1@mid.uni-berlin.de>

Diez B. Roggisch wrote:

> Alex Jurkiewicz wrote:
> 
>> Gabriel Genellina wrote:
>>> Try logging the start/stop of your threads. It may be that your
>>> threads stop before you think. The above code works correctly only if
>>> you fill the queue before starting any thread - because as soon as a
>>> thread sees the queue empty, it finishes.
>>> You could use the sample code in the Queue documentation at the end of
>>> http://docs.python.org/library/queue.htm
>> The queue is actually filled before the threads are started, data is
>> only removed after they start.
>> 
>> Logging thread state (at least in debug mode) would be good though. How
>> would I go about it in this example? The docs suggest using thread.name,
>> but in my current setup I don't have any idea which thread is running.
>> Something like this:
>> for i in range(CONCURRENCY):
>>     THREADS.append( threading.Thread(target=threadProcessRecipient,
>> args=i, name=i) )
>> 
>> And:
>> 
>> def threadProcessRecipient(name):
>>     print "Name is %s" % name
> 

Oh, and I forgot - threading.currentThread() gets you the actively running
thread of course.

Dize


From a.a.ovtchinnikov at gmail.com  Mon May  4 07:32:38 2009
From: a.a.ovtchinnikov at gmail.com (Snorri H)
Date: Mon, 4 May 2009 04:32:38 -0700 (PDT)
Subject: yet another list comprehension question
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
Message-ID: <dde406ca-ef32-4270-a4e3-db6aa5e4be5a@e20g2000vbc.googlegroups.com>

On May 3, 6:13 am, Ross <ross.j... at gmail.com> wrote:
> I'm trying to set up a simple filter using a list comprehension. If I
> have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
> and I wanted to filter out all tuples containing None, I would like to
> get the new list b = [(1,2), (3,4),(6,7)].
>
> I tried b = [i for i in a if t for t in i is not None]   but I get the
> error that "t is not defined". What am I doing wrong?


Works as well:
filter(lambda x:not None in x, your_list)


From arnodel at googlemail.com  Mon May  4 07:54:15 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 04 May 2009 12:54:15 +0100
Subject: yet another list comprehension question
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
	<dde406ca-ef32-4270-a4e3-db6aa5e4be5a@e20g2000vbc.googlegroups.com>
Message-ID: <m2skjlt76g.fsf@googlemail.com>

Snorri H <a.a.ovtchinnikov at gmail.com> writes:

> On May 3, 6:13 am, Ross <ross.j... at gmail.com> wrote:
>> I'm trying to set up a simple filter using a list comprehension. If I
>> have a list of tuples, a = [(1,2), (3,4), (5,None), (6,7), (8, None)]
>> and I wanted to filter out all tuples containing None, I would like to
>> get the new list b = [(1,2), (3,4),(6,7)].
>>
>> I tried b = [i for i in a if t for t in i is not None]   but I get the
>> error that "t is not defined". What am I doing wrong?
>
>
> Works as well:
> filter(lambda x:not None in x, your_list)
                  ^^^^^^^^^^^^^
This is usually spelt 'None not in x'.

-- 
Arnaud



From mgalle at irisa.fr  Mon May  4 08:08:51 2009
From: mgalle at irisa.fr (=?ISO-8859-1?Q?Matthias_Gall=E9?=)
Date: Mon, 04 May 2009 14:08:51 +0200
Subject: find sublist inside list
Message-ID: <gtmlsk$q51$1@amma.irisa.fr>

Hi.

My problem is to replace all occurrences of a sublist with a new element.

Example:
Given ['a','c','a','c','c','g','a','c'] I want to replace all 
occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).

If I do this with string ('acaccgac') I have the advantage of all the 
'find' functions, but perfomance is bad and some extra care must be 
taken if one element consist of more then one character (case of 11 for 
example)

So I really would like to work with lists straightforward, but I could 
not found anything to search a sublist inside a list.
Any propositions for a simple solution?

Thanks in advance,


--
Matthias Gall?
Project Symbiose
Centre de Recherche INRIA Rennes - Bretagne Atlantique,
Campus de Beaulieu, 35042 Rennes cedex, France
tel: (33|0) 2 9984 7523
http://www.irisa.fr/symbiose/matthias_galle


From drobinow at gmail.com  Mon May  4 08:15:47 2009
From: drobinow at gmail.com (David Robinow)
Date: Mon, 4 May 2009 08:15:47 -0400
Subject: yet another list comprehension question
In-Reply-To: <gtm1ik$19tj$1@adenine.netfront.net>
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
	<gtm1ik$19tj$1@adenine.netfront.net>
Message-ID: <4eb0089f0905040515s7937dd6ck404282a8a52a105d@mail.gmail.com>

On Mon, May 4, 2009 at 2:33 AM, namekuseijin
<namekuseijin.nospam at gmail.com> wrote:
>>>> ls = [(1,2), (3,4), (5, None), (6,7), (8, None)]
>>>> [(x,y) for (x,y) in ls if y]
> [(1, 2), (3, 4), (6, 7)]

Nope. That filters out 0 as well as None. Not what the OP asked for.


From a.a.ovtchinnikov at gmail.com  Mon May  4 08:26:23 2009
From: a.a.ovtchinnikov at gmail.com (Snorri H)
Date: Mon, 4 May 2009 05:26:23 -0700 (PDT)
Subject: How to walk up parent directories?
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
Message-ID: <5deab389-38f2-4c54-bfe3-3ce7cefa8764@v17g2000vbb.googlegroups.com>

On May 4, 5:04 am, Matthew Wilson <m... at tplus1.com> wrote:
> Is there already a tool in the standard library to let me walk up from a
> subdirectory to the top of my file system?


Never seen such a standard tool, yet it can be implemented in a way
like this

def walkup(path):
    aux = path.rsplit('/')
    while aux != ['']:
        yield reduce(lambda x,y:x+'/'+y,aux)
        aux.pop()
    yield '/'

Maybe this is not the best way to ascend directories, but it seems to
work.


From mark at mailinator.com  Mon May  4 08:29:54 2009
From: mark at mailinator.com (Mark)
Date: 04 May 2009 12:29:54 GMT
Subject: What IDE support python 3.0.1 ?
References: <e154b479-82a6-4aca-9e7b-687ecabe68c8@e21g2000yqb.googlegroups.com>
	<mailman.3962.1239835547.11746.python-list@python.org>
Message-ID: <pan.2009.05.04.12.29.53@mailinator.com>

On Wed, 15 Apr 2009 22:45:35 +0000, Benjamin Peterson wrote:
> Why do you think you're wasting time with 2.x?

I'm a relative newbie to python as well but I'd agree that there is at
least a small degree of time "wasted" learning python 2.x simply because
the standard library of python 3.x has been cleaned up and consolidated
which makes learning it slightly easier.


From zasaconsulting at gmail.com  Mon May  4 08:38:10 2009
From: zasaconsulting at gmail.com (Alexzive)
Date: Mon, 4 May 2009 05:38:10 -0700 (PDT)
Subject: replacing numbers in LARGE MATRIX with criterium in 2 columns (a--> 
	b)
Message-ID: <68d22002-fc0a-4590-9395-c78b6ee412b2@r34g2000vba.googlegroups.com>

Hello,
I have this matrix [20*4 - but it could be n*4 , with n~100,000] in
file "EL_list" like this:

    1,      1,      2,      3
     2,      4,      1,      5
     3,      5,      1,      6
     4,      7,      5,      6
     5,      8,      7,      9
     6,      8,      5,      7
     7,     10,      9,      7
     8,     10,     11,     12
     9,      7,     13,     10
    10,     14,     15,     16
    11,     14,     17,     15
    12,     17,     14,     18
    13,     13,     16,     10
    14,     16,     15,     11
    15,     16,     11,     10
    16,     19,     20,     21
    17,     22,     15,     20
    18,     17,     20,     15
    19,     23,     20,     24
    20,     25,     24,     20

I would like to replace some numbers in "EL_list" but only in columns
2,3,4 using the criterium by line in file "criterium" (column 1 are
the new numbers, column 2 the old ones).

1	1
2	3
3	5
4	12
5	13
6	14
7	15
8	16
9	17
10	18
11	19
12	10
13	21
14	22
15	23
16	24
17	25

For example all the 7 have to replaced by 15 and so on..

-- How to implement it in a fast end efficient code?

many thanks, Alex


From bjourne at gmail.com  Mon May  4 08:39:08 2009
From: bjourne at gmail.com (=?ISO-8859-1?Q?BJ=F6rn_Lindqvist?=)
Date: Mon, 4 May 2009 14:39:08 +0200
Subject: Self function
In-Reply-To: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
Message-ID: <740c3aec0905040539y78d1332k71a911a7007aa49b@mail.gmail.com>

2009/5/4  <bearophileHUGS at lycos.com>:
> An idea-syntax:
>
> def fact(n):
> ? ?return 1 if n <= 1 else n * inspect.self(n - 1)
>
> Or even a lambda, because you don't need the name anymore to call the
> function:
>
> fact = lambda n: 1 if n <= 1 else n * self(n - 1)

How would it work with methods?

class Foo:
    def fac(self, n):
        return 1 if n <= 1 else n * self.self(n-1)

??


-- 
mvh Bj?rn


From zasaconsulting at gmail.com  Mon May  4 08:41:04 2009
From: zasaconsulting at gmail.com (Alessandro)
Date: Mon, 4 May 2009 05:41:04 -0700 (PDT)
Subject: replacing numbers in LARGE MATRIX with criterium in 2 columns 
	(a--> b)
References: <68d22002-fc0a-4590-9395-c78b6ee412b2@r34g2000vba.googlegroups.com>
Message-ID: <16a90ce7-7634-4f22-9f53-47b1e30ab234@r34g2000vba.googlegroups.com>

On May 4, 2:38 pm, Alexzive <zasaconsult... at gmail.com> wrote:
> Hello,
> I have this matrix [20*4 - but it could be n*4 , with n~100,000] in
> file "EL_list" like this:
>
>     1,      1,      2,      3
>      2,      4,      1,      5
>      3,      5,      1,      6
>      4,      7,      5,      6
>      5,      8,      7,      9
>      6,      8,      5,      7
>      7,     10,      9,      7
>      8,     10,     11,     12
>      9,      7,     13,     10
>     10,     14,     15,     16
>     11,     14,     17,     15
>     12,     17,     14,     18
>     13,     13,     16,     10
>     14,     16,     15,     11
>     15,     16,     11,     10
>     16,     19,     20,     21
>     17,     22,     15,     20
>     18,     17,     20,     15
>     19,     23,     20,     24
>     20,     25,     24,     20
>
> I would like to replace some numbers in "EL_list" but only in columns
> 2,3,4 using the criterium by line in file "criterium" (column 1 are
> the new numbers, column 2 the old ones).
>
> 1       1
> 2       3
> 3       5
> 4       12
> 5       13
> 6       14
> 7       15
> 8       16
> 9       17
> 10      18
> 11      19
> 12      10
> 13      21
> 14      22
> 15      23
> 16      24
> 17      25



>
> For example all the 7 have to replaced by 15 and so on..
>

ERRATA: for example, all the 15 have to replaced by 7 and so on..


From bearophileHUGS at lycos.com  Mon May  4 08:46:32 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 05:46:32 -0700 (PDT)
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
Message-ID: <25535ba8-80d9-4eb0-8f31-e453f31e0f26@s20g2000vbp.googlegroups.com>

Matthias Gall?:
> My problem is to replace all occurrences of a sublist with a new element.
> Example:
> Given ['a','c','a','c','c','g','a','c'] I want to replace all
> occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).

There are several ways to solve this problem. Representing a string as
a list of "chars" (1-strings) is fine if you work with small strings,
but once they get longer you need too much memory and time.

This is a starting point:

>>> mapper = {"a":6, "c":6}
>>> data = 'acaccgac'
>>> [mapper.get(c, c) for c in data]
[6, 6, 6, 6, 6, 'g', 6, 6]

If you need higher performance, to represent few small numbers into a
well defined string like genomic data, you can use ASCII values of 6
and 11:

>>> from string import maketrans
>>> tab = maketrans("acgt", "".join([chr(6), chr(6), "gt"]))
>>> s.translate(tab)
'\x06\x06\x06\x06\x06g\x06\x06'

Later in processing it's easy to tell apart normal genome bases from
those small numbers.

Note that there is the array.array function too in the standard lib,
and elsewhere there is Numpy too.

There are several other possible solutions, but I stop here so you can
explain your purposes and constraints better.

Bye,
bearophile


From mail at johnohagan.com  Mon May  4 09:01:36 2009
From: mail at johnohagan.com (John O'Hagan)
Date: Mon, 4 May 2009 13:01:36 +0000
Subject: find sublist inside list
In-Reply-To: <gtmlsk$q51$1@amma.irisa.fr>
References: <gtmlsk$q51$1@amma.irisa.fr>
Message-ID: <200905041301.36962.mail@johnohagan.com>

On Mon, 4 May 2009, Matthias Gall? wrote:
> Hi.
>
> My problem is to replace all occurrences of a sublist with a new element.
>
> Example:
> Given ['a','c','a','c','c','g','a','c'] I want to replace all
> occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).
>

li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c'] 
for i  in range(len(li)):
    if li[i:i + 2] == ['a', 'c']:
        li[i:i + 2] = ['6']

HTH,

John






From f.guerrieri at gmail.com  Mon May  4 09:13:27 2009
From: f.guerrieri at gmail.com (Francesco Guerrieri)
Date: Mon, 4 May 2009 15:13:27 +0200
Subject: find sublist inside list
In-Reply-To: <200905041301.36962.mail@johnohagan.com>
References: <gtmlsk$q51$1@amma.irisa.fr>
	<200905041301.36962.mail@johnohagan.com>
Message-ID: <79b79e730905040613y5ba8e36wb27e66260f06247@mail.gmail.com>

On Mon, May 4, 2009 at 3:01 PM, John O'Hagan <mail at johnohagan.com> wrote:

> On Mon, 4 May 2009, Matthias Gall? wrote:
> > Hi.
> >
> > My problem is to replace all occurrences of a sublist with a new element.
> >
> > Example:
> > Given ['a','c','a','c','c','g','a','c'] I want to replace all
> > occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).
> >
>
> li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
> for i  in range(len(li)):
>    if li[i:i + 2] == ['a', 'c']:
>        li[i:i + 2] = ['6']
>
> HTH,
>
> John
>

Beware that you are mutating the list you are iterating over. That could
lead to some strange bugs (for instance if you replaced the deleted items
with a longer sequence, the range(len(li)) would still go up to the original
lenght).
It is better to modify a new list instead. Eg you could append to a new
list.

Francesco
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From bearophileHUGS at lycos.com  Mon May  4 09:20:34 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 06:20:34 -0700 (PDT)
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
	<mailman.5041.1241442097.11746.python-list@python.org>
Message-ID: <c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com>

John O'Hagan:
> li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
> for i ?in range(len(li)):
> ? ? if li[i:i + 2] == ['a', 'c']:
> ? ? ? ? li[i:i + 2] = ['6']

Oh well, I have done a mistake, it seems.
Another solution then:

>>> 'acaccgac'.replace("ac", chr(6))
'\x06\x06cg\x06'

Bye,
bearophile


From amrbekhit at gmail.com  Mon May  4 09:27:49 2009
From: amrbekhit at gmail.com (Amr)
Date: Mon, 4 May 2009 06:27:49 -0700 (PDT)
Subject: Default padding for Tkinter grid
Message-ID: <e534085e-8f6a-46e9-82d8-316eccfbf8f1@u10g2000vbd.googlegroups.com>

Hello all,

I've been spending the last few days experimenting with Tkinter. The
grid manager is nice and easy to use, but I have found that I am often
having to specify padx and pady options to every widget I add to my
grid. The way I am doing it is to create a dictionary:

paddding = {'padx': '1m', 'pady': '1m'}

and then apply it to the grid method using **padding.

However, I was wondering if there was a way of setting default padx
and pady controls for the grid, so that I can just call grid without
having to specify any extra parameters.

Thanks,

--Amr


From tomanishkb at gmail.com  Mon May  4 09:30:28 2009
From: tomanishkb at gmail.com (M Kumar)
Date: Mon, 4 May 2009 19:00:28 +0530
Subject: Help in getting the IP address of client machines
Message-ID: <783b47270905040630y2342bb61xe741ba84bbb86707@mail.gmail.com>

Hi,

I am using pylons web framework for my server. I need to get the ip address
of the client machine which made a request to the server in my python code.
How can I do that, I am new to pylons and the existing server has so many
applications. looking forward to get some solutions from the kind friendly
users

thanks & regards
Maneesh KB
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From ganesh.gbg at gmail.com  Mon May  4 09:44:41 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Mon, 4 May 2009 06:44:41 -0700 (PDT)
Subject: Is there is any way to send messages to  chunk of emails ID's  
	concurrently using smptlib
Message-ID: <17ea2ba6-3f5d-4e7e-b05b-6d91dfbc5b36@k19g2000prh.googlegroups.com>

Hi friends,
I suppose sendmail() can send mails one by one ,how to send mails
concurrently ,
It would be very grateful,if someone could point out a solution.
Thanks
Ganesh


From deets at nospam.web.de  Mon May  4 09:45:16 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 04 May 2009 15:45:16 +0200
Subject: How to walk up parent directories?
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
	<5deab389-38f2-4c54-bfe3-3ce7cefa8764@v17g2000vbb.googlegroups.com>
Message-ID: <7689oiF1bjavlU1@mid.uni-berlin.de>

Snorri H wrote:

> On May 4, 5:04 am, Matthew Wilson <m... at tplus1.com> wrote:
>> Is there already a tool in the standard library to let me walk up from a
>> subdirectory to the top of my file system?
> 
> 
> Never seen such a standard tool, yet it can be implemented in a way
> like this
> 
> def walkup(path):
>     aux = path.rsplit('/')
>     while aux != ['']:
>         yield reduce(lambda x,y:x+'/'+y,aux)
>         aux.pop()
>     yield '/'
> 
> Maybe this is not the best way to ascend directories, but it seems to
> work.

It's not working for windows. And using reduce to create a path instead of 

os.sep.join(aux)

seems to be showing off mad functional coding skillz than anything else...

Diez


From kyrie at uh.cu  Mon May  4 09:52:14 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Mon, 4 May 2009 09:52:14 -0400
Subject: Multiprocessing.Queue - I want to end.
In-Reply-To: <00a201c9cc8e$89420f40$0d00a8c0@Hendrik>
References: <200904301649.10341.kyrie@uh.cu>
	<1241412986.49fe757a94f93@mail.uh.cu>
	<00a201c9cc8e$89420f40$0d00a8c0@Hendrik>
Message-ID: <200905040952.14804.kyrie@uh.cu>

On Monday 04 May 2009 04:01:23 am Hendrik van Rooyen wrote:

> This will form a virtual (or real if you have different machines)
> systolic array with producers feeding consumers that feed
> the summary process, all running concurrently.

Nah, I can't do that. The summary process is expensive, but not nearly as 
expensive as the consuming (10 minutes vs. a few hours), and can't be started 
anyway before the consumers are done.

> You only need to keep the output of the consumers in files if
> you need access to it later for some reason. In your case it sounds
> as if you are only interested in the output of the summary.

Or if the summarizing process requires that it is stored on files. Or if the 
consumers naturally store the data on files. The consumers "produce" several 
gigabytes of data, not enough to make it intractable, but enough to not want 
to load them into RAM or transmit it back.

In case you are wondering what the job is: i'm indexing a lot of documents 
with Xapian. The producer reads the [compressed] documents from the hard 
disk, the consumers process it and index it on they own xapian database. When 
they are finished, I merge the databases (the summarizing) and delete the 
partial DBs. I don't need the DBs to be in memory at any time, and xapian 
works with files anyway. Even if I were to use different machines (not worth 
it for a process that will not run very frequently, except at developing 
time), it would be still cheaper to scp the files.

Now, if I only had a third core available to consume a bit faster ...

Regards,

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From davea at ieee.org  Mon May  4 09:52:38 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 04 May 2009 09:52:38 -0400
Subject: replacing numbers in LARGE MATRIX with criterium in 2 columns
	(a--> b)
In-Reply-To: <16a90ce7-7634-4f22-9f53-47b1e30ab234@r34g2000vba.googlegroups.com>
References: <68d22002-fc0a-4590-9395-c78b6ee412b2@r34g2000vba.googlegroups.com>
	<16a90ce7-7634-4f22-9f53-47b1e30ab234@r34g2000vba.googlegroups.com>
Message-ID: <49FEF326.7080501@ieee.org>



Alessandro wrote:
> On May 4, 2:38 pm, Alexzive <zasaconsult... at gmail.com> wrote:
>   
>> Hello,
>> I have this matrix [20*4 - but it could be n*4 , with n~100,000] in
>> file "EL_list" like this:
>>
>>     1,      1,      2,      3
>>      2,      4,      1,      5
>>      3,      5,      1,      6
>>      4,      7,      5,      6
>>      5,      8,      7,      9
>>      6,      8,      5,      7
>>      7,     10,      9,      7
>>      8,     10,     11,     12
>>      9,      7,     13,     10
>>     10,     14,     15,     16
>>     11,     14,     17,     15
>>     12,     17,     14,     18
>>     13,     13,     16,     10
>>     14,     16,     15,     11
>>     15,     16,     11,     10
>>     16,     19,     20,     21
>>     17,     22,     15,     20
>>     18,     17,     20,     15
>>     19,     23,     20,     24
>>     20,     25,     24,     20
>>
>> I would like to replace some numbers in "EL_list" but only in columns
>> 2,3,4 using the criterium by line in file "criterium" (column 1 are
>> the new numbers, column 2 the old ones).
>>
>> 1       1
>> 2       3
>> 3       5
>> 4       12
>> 5       13
>> 6       14
>> 7       15
>> 8       16
>> 9       17
>> 10      18
>> 11      19
>> 12      10
>> 13      21
>> 14      22
>> 15      23
>> 16      24
>> 17      25
>>     
>
>
>
>   
>> For example all the 7 have to replaced by 15 and so on..
>>
>>     
>
> ERRATA: for example, all the 15 have to replaced by 7 and so on..
>
>   
What have you come up with so far?  Did the instructor give you any 
sample code to solve similar problems?  Did he really describe it as a 
matrix?

Sounds to me like you have two text files.  One contains a replacement 
table (which you can read into a dictionary), and the other (large) file 
is just text.  After building the dictionary, you'd want a loop that 
goes through the text file, splitting each line into a list of four.  
You then use the dictionary to replace list items 1, 2, and 3, and write 
the result someplace.

Try writing the code, see if anything goes wrong, and then ask for help.



From google at mrabarnett.plus.com  Mon May  4 09:54:33 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 14:54:33 +0100
Subject: replacing numbers in LARGE MATRIX with criterium in 2 columns
	(a--> 	b)
In-Reply-To: <68d22002-fc0a-4590-9395-c78b6ee412b2@r34g2000vba.googlegroups.com>
References: <68d22002-fc0a-4590-9395-c78b6ee412b2@r34g2000vba.googlegroups.com>
Message-ID: <49FEF399.5070806@mrabarnett.plus.com>

Alexzive wrote:
> Hello,
> I have this matrix [20*4 - but it could be n*4 , with n~100,000] in
> file "EL_list" like this:
> 
>     1,      1,      2,      3
>      2,      4,      1,      5
>      3,      5,      1,      6
>      4,      7,      5,      6
>      5,      8,      7,      9
>      6,      8,      5,      7
>      7,     10,      9,      7
>      8,     10,     11,     12
>      9,      7,     13,     10
>     10,     14,     15,     16
>     11,     14,     17,     15
>     12,     17,     14,     18
>     13,     13,     16,     10
>     14,     16,     15,     11
>     15,     16,     11,     10
>     16,     19,     20,     21
>     17,     22,     15,     20
>     18,     17,     20,     15
>     19,     23,     20,     24
>     20,     25,     24,     20
> 
> I would like to replace some numbers in "EL_list" but only in columns
> 2,3,4 using the criterium by line in file "criterium" (column 1 are
> the new numbers, column 2 the old ones).
> 
> 1	1
> 2	3
> 3	5
> 4	12
> 5	13
> 6	14
> 7	15
> 8	16
> 9	17
> 10	18
> 11	19
> 12	10
> 13	21
> 14	22
> 15	23
> 16	24
> 17	25
> 
> For example all the 7 have to replaced by 15 and so on..
> 
> -- How to implement it in a fast end efficient code?
 >
Read the contents of "criterium" into a dict with the old value as the
key and the new value as the value and then iterate through the matrix
replacing the values in columns 2 to 4 with criterium.get(current_value,
current_value).

Incidentally, the singular of "criteria" is "criterion" because it's
Greek, not Latin.


From google at mrabarnett.plus.com  Mon May  4 09:57:51 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 14:57:51 +0100
Subject: [SPAM] Re: Threaded alternatives to smtplib?
In-Reply-To: <767h7tF1b8q8gU1@mid.uni-berlin.de>
References: <mailman.5028.1241416479.11746.python-list@python.org>
	<767h7tF1b8q8gU1@mid.uni-berlin.de>
Message-ID: <49FEF45F.7070700@mrabarnett.plus.com>

Diez B. Roggisch wrote:
> Alex Jurkiewicz schrieb:
>> Hi all,
>> I'm writing a Python script to do a "mail merge" style email 
>> distribution. I create a few python threads and in each one I call 
>> `smtpserver = smtplib.SMTP(our.smtpserver.com)`. However, during the 
>> sending process, there seems to be only one connection open to our 
>> mail server at any one time. In other words, all these threads gain me 
>> no speed benefit at all!
>>
>> I seem to be running into the issue where smtplib is not fully 
>> thread-safe, as mentioned in this thread:
>> http://mail.python.org/pipermail/python-list/2007-March/429067.html
>> http://mail.python.org/pipermail/python-list/2007-March/429172.html
>>
>> Does anyone have suggestions as to a suitable workaround for this 
>> issue? I was looking at the Twisted library, which seems possible but 
>> significantly more complex.
> 
> I doubt that there is such issue. The above discussion is not concluding 
> that there actually *are* threading-issues within smtplib. And looking 
> at the source of smtplib, it certainly doesn't use any 
> locking-primitives or (directly) any c-extension that might explain such 
> behavior.
> 
> Without more code, it's impossible to tell if there is anything peculiar 
> in your usage of the lib. Maybe you close your connections to fast to 
> see several open?
> 
If all the threads are using the same server, couldn't the SMTP part be
put into its own thread and then fed the pre-composed emails via a
queue?


From dns4 at cornell.edu  Mon May  4 09:58:40 2009
From: dns4 at cornell.edu (David Smith)
Date: Mon, 04 May 2009 09:58:40 -0400
Subject: How to walk up parent directories?
In-Reply-To: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
Message-ID: <gtmsag$ha2$1@ruby.cit.cornell.edu>

Matthew Wilson wrote:
> Is there already a tool in the standard library to let me walk up from a
> subdirectory to the top of my file system?
> 
> In other words, I'm looking for something like:
> 
>     >>> for x in walkup('/home/matt/projects'):
>     ...     print(x)
>     /home/matt/projects
>     /home/matt
>     /home
>     /
> 
> I know I could build something like this with various os.path
> components, but I'm hoping I don't have to.
> 
> TIA
> 
> 
> Matt

You should take a look at the os.path module.  Seems like you might find
something in that toolbox for this.

--David


From mgalle at irisa.fr  Mon May  4 10:01:02 2009
From: mgalle at irisa.fr (=?ISO-8859-1?Q?Matthias_Gall=E9?=)
Date: Mon, 04 May 2009 16:01:02 +0200
Subject: find sublist inside list
In-Reply-To: <c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com>
References: <gtmlsk$q51$1@amma.irisa.fr>
	<mailman.5041.1241442097.11746.python-list@python.org>
	<c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com>
Message-ID: <gtmsf0$se7$1@amma.irisa.fr>

bearophileHUGS at lycos.com wrote:
> John O'Hagan:
>> li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
>> for i  in range(len(li)):
>>     if li[i:i + 2] == ['a', 'c']:
>>         li[i:i + 2] = ['6']
> 
> Oh well, I have done a mistake, it seems.
> Another solution then:
> 
>>>> 'acaccgac'.replace("ac", chr(6))
> '\x06\x06cg\x06'
> 
> Bye,
> bearophile

Thanks bearophile and John for your quick answers.
Unfortunately, the int that can replace a sublist can be > 255, but 
John's answer looks simple and good enough for me. I will use it as a 
starting point.

Thank's again.

-- 
Matthias Gall?
Project Symbiose
Centre de Recherche INRIA Rennes - Bretagne Atlantique,
Campus de Beaulieu, 35042 Rennes cedex, France
tel: (33|0) 2 9984 7523
http://www.irisa.fr/symbiose/matthias_galle


From ross.jett at gmail.com  Mon May  4 10:01:07 2009
From: ross.jett at gmail.com (Ross)
Date: Mon, 4 May 2009 07:01:07 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
Message-ID: <16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com>

On May 3, 10:16?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 3, 11:29 pm, Chris Rebert <c... at rebertia.com> wrote:
>
> > Probably not the cause of the problem, but where
> > did the magic numbers 1.072 and 1.08 come from?
>
> It is perhaps not the most direct cause of the problem, in the sense
> that the magic numbers could take various values and the problem would
> still be there. ?But the magic numbers appear to be used for
> "spreading out" bye selection, and that's broken.
>
> The extended slice as written will always pick the first element,
> since the step is guaranteed to be positive. ?Since the first player
> (or None, when there are an odd number of players) stays put in the
> first position during the round_robin shuffle, that player will always
> be selected for a bye.
>
> Further, as written, the calculated number of byes has no bearing on
> the actual number of byes selected.
>
> I think what I would do is adjust the shuffling algorithm in such a
> way that everyone moves through the various positions in the list
> (would it be as simple as adding a shift at the end of
> round_robin???). ?Then I could simply select the byes from one end of
> the list (with a regular slice instead of an extended slice).
>
> John

The "magic numbers" that everyone is wondering about are indeed used
for spreading out the bye selection and I got them by simply
calculating a line of best fit when plotting several courts: byes
ratios.

The "byes = #whatever" in my code calculate the number of tuples that
need to be placed in the bye_list.

At first glance, the suggestion of adding a simple shift at the end of
round_robin doesn't seem to work since round_robin already shifts
everything except for the first position already. Please correct me if
I'm wrong because you might have been suggesting something different.


From ross.jett at gmail.com  Mon May  4 10:07:38 2009
From: ross.jett at gmail.com (Ross)
Date: Mon, 4 May 2009 07:07:38 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com>
Message-ID: <a0934ad7-e499-4ddf-abd8-c37c17a7f032@x6g2000vbg.googlegroups.com>

On May 4, 7:01?am, Ross <ross.j... at gmail.com> wrote:
> On May 3, 10:16?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
>
>
>
> > On May 3, 11:29 pm, Chris Rebert <c... at rebertia.com> wrote:
>
> > > Probably not the cause of the problem, but where
> > > did the magic numbers 1.072 and 1.08 come from?
>
> > It is perhaps not the most direct cause of the problem, in the sense
> > that the magic numbers could take various values and the problem would
> > still be there. ?But the magic numbers appear to be used for
> > "spreading out" bye selection, and that's broken.
>
> > The extended slice as written will always pick the first element,
> > since the step is guaranteed to be positive. ?Since the first player
> > (or None, when there are an odd number of players) stays put in the
> > first position during the round_robin shuffle, that player will always
> > be selected for a bye.
>
> > Further, as written, the calculated number of byes has no bearing on
> > the actual number of byes selected.
>
> > I think what I would do is adjust the shuffling algorithm in such a
> > way that everyone moves through the various positions in the list
> > (would it be as simple as adding a shift at the end of
> > round_robin???). ?Then I could simply select the byes from one end of
> > the list (with a regular slice instead of an extended slice).
>
> > John
>
> The "magic numbers" that everyone is wondering about are indeed used
> for spreading out the bye selection and I got them by simply
> calculating a line of best fit when plotting several courts: byes
> ratios.
>
> The "byes = #whatever" in my code calculate the number of tuples that
> need to be placed in the bye_list.
>
> At first glance, the suggestion of adding a simple shift at the end of
> round_robin doesn't seem to work since round_robin already shifts
> everything except for the first position already. Please correct me if
> I'm wrong because you might have been suggesting something different.

And also, as you all have pointed out, my inclusion of

> def test_round_robin(players, rounds, courts, doubles = False):
>     players = range(players)
>     for week in round_robin(players,rounds,courts):

should have been

> def test_round_robin(players, rounds, courts, doubles = False):
>     players = range(players)
>     for week in round_robin(players,rounds):

I forgot to erase that extra parameter when I was playing around with
my code.


From flamz3d at gmail.com  Mon May  4 10:09:20 2009
From: flamz3d at gmail.com (flamz3d at gmail.com)
Date: Mon, 4 May 2009 07:09:20 -0700 (PDT)
Subject: AutoComplete in C++ Editor for Python
References: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>
	<mailman.5011.1241378077.11746.python-list@python.org>
Message-ID: <10fef506-2c39-418c-82e8-5c0c05a19e5c@s31g2000vbp.googlegroups.com>

On May 3, 3:14?pm, Dave Angel <da... at ieee.org> wrote:
> flam... at gmail.com wrote:
> > Hello,
> > I am embedding python support in my C++ application and was looking at
> > adding "Intellisense" or "AutoComplete" support.
>
> > I found a way to do it using the "dir" function, but this creates a
> > problem. Here's why. Let's say I have the following code in my editor:
>
> > import sys
> > x = sys
>
> > Now, I would like to get all attributes of the object called 'x'. I
> > can "instrument" the code and add "print dir(x)" at the end,
> > temporarily redirect the python output to a string and execute the
> > code.
>
> > But this is not safe: I do NOT want to execute the code while the user
> > is typing!
>
> > Is there a way to "compile" the python code and get access to the
> > symbol table from that compiled block?
>
> > Did anybody ever implement AutoComplete in a editor for Python?
>
> > cheers.
>
> Several editors for Python support auto-complete, to one extent or
> another. ?The only one I have experience with is Komodo. ?Komodo runs in
> a separate process, so it doesn't suffer from the problems of having two
> gui event-loops in the same process, and other similar problems. ? It
> also won't be executing code that might have side effects in the child
> process.
>
> The downside is that in order to do auto-complete, it has to figure it
> out from other clues. ?From the docs, and from reading, and from
> experiementing, I believe that it uses two approaches. ?One approach is
> a set of language files which try to describe all the symbols in the
> standard language and library. ?They have one for each release (2.4,
> 2.5, ...) ?Theoretically, you could add your own for other libraries. ?
> Second approach is to parse the code that's visible to it. ?That parsing
> is well done, and surprisingly quick, but there are lots of tricks a
> developer might use that can fool it. ?For example, wxPython lets you
> import just one symbol, and lots more appear magically. ?It's no big
> deal, they have code structured one way, but the interface is very
> different. ?Catch is that code completion frequently gets fooled by these.
>
> I'd point out that if you do walk the dictionaries at run time, you'll
> get different results when you do it with nothing running than if you do
> a strictly static analysis. ?So some things might only show up if you've
> stepped into the function with the magic going on.
>
> Simplest example I can come up with of something a static analysis won't
> spot: ? An instance object ? ?obj ? may have some number of attributes
> assigned the the __init__() method. ?But it could also have new fields
> added by anyone with a referent into it.
>
> There is a Python parser in module ast. ?Perhaps that'd be some help. ?
> I've not used it, so can't give you any specifics.
>
> DaveA


I think it might be possible for me to figure out how to do
AutoCompletion using the symtable object. But I am having difficulty
making sense of it.

In my tests, I was use the following Python code:

[code]
import sys
x=sys
[/code]

The idea is to get the type of the variable x

To attempt this, I use the following C code (my editor is written in
C)

symtable* st = Py_SymtableString ( "import sys
\nx=sys,"<string>",Py_single_input);

PyObject *name, *value;
Py_ssize_t pos = 0;
while (PyDict_Next(st->st_symbols, &pos, &name, &value))
{
...
}



Using this code, I can get information like the name of the symbol
(x), but I can't figure out how to get the type. If I knew how to get
this it would solve 99% of my problems :)

Any ideas?


From apardon at forel.vub.ac.be  Mon May  4 10:25:44 2009
From: apardon at forel.vub.ac.be (Antoon Pardon)
Date: 4 May 2009 14:25:44 GMT
Subject: if statement, with function inside it: if (t = Test()) == True:
References: <d14b67f4-6b5e-4748-85f6-6d4f69353fa2@w40g2000yqd.googlegroups.com>
	<020183f4$0$20619$c3e8da3@news.astraweb.com>
Message-ID: <slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>

On 2009-04-24, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:
> On Fri, 24 Apr 2009 03:00:26 -0700, GC-Martijn wrote:
>
>> Hello,
>> 
>> I'm trying to do a if statement with a function inside it. I want to use
>> that variable inside that if loop , without defining it.
>> 
>> def Test():
>>     return 'Vla'
>> 
>> I searching something like this:
>> 
>> if (t = Test()) == 'Vla':
>>     print t # Vla
>> 
>> or
>> 
>> if (t = Test()):
>>     print t # Vla
>
> Fortunately, there is no way of doing that with Python. This is one 
> source of hard-to-debug bugs that Python doesn't have.

I think this is an unfortunate consequence of choosing '=' for the
assignment. They could have chosen an other token to indicate an
assignment one that would have made the difference between an
assignment and a comparison more visually different and thus
bugs by using one while needing the other less hard to track
down.

So when a certain kind of bug is hard to track down because of
the similarity of the tokens and not because of the specific
functionality I find it unfortunate they dropped the functionality
instead of making the tokens less similar.

-- 
Antoon Pardon


From bearophileHUGS at lycos.com  Mon May  4 10:53:03 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 07:53:03 -0700 (PDT)
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
	<mailman.5041.1241442097.11746.python-list@python.org> 
	<c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com> 
	<gtmsf0$se7$1@amma.irisa.fr>
Message-ID: <d821dc32-e870-4ff1-834e-91d0517f7620@s20g2000vbp.googlegroups.com>

Matthias Gall?:
>the int that can replace a sublist can be > 255,<

You didn't specify your integer ranges.
Probably there are many other solutions for your problem, but you have
to give more information. Like the typical array size, typical range
of the numbers, how much important is total memory used, how much
important is running speed, what kind of processing (or serialization/
output) you later have to do with such arrays, and so on.
Other solutions include using an array('H', []), and using 0-255 to
represent ASCII and numbers >255 <2^16 to represent the other numbers,
etc.
If speed is critical you can even think about creating a little
function with PyInline or D+Pyd, etc.

Bye,
bearophile


From gagsl-py2 at yahoo.com.ar  Mon May  4 10:57:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 04 May 2009 11:57:41 -0300
Subject: Default padding for Tkinter grid
References: <e534085e-8f6a-46e9-82d8-316eccfbf8f1@u10g2000vbd.googlegroups.com>
Message-ID: <op.uteuifvox6zn5v@gabriel.sleipnir-bsas>

En Mon, 04 May 2009 10:27:49 -0300, Amr <amrbekhit at gmail.com> escribi?:

> I've been spending the last few days experimenting with Tkinter. The
> grid manager is nice and easy to use, but I have found that I am often
> having to specify padx and pady options to every widget I add to my
> grid. The way I am doing it is to create a dictionary:
>
> paddding = {'padx': '1m', 'pady': '1m'}
>
> and then apply it to the grid method using **padding.
>
> However, I was wondering if there was a way of setting default padx
> and pady controls for the grid, so that I can just call grid without
> having to specify any extra parameters.

You have to call grid() once on every widget, so adding **padding at the  
end doesn't appear too bad to me:

   label = Label(master, text="Hello world!")
   widget.grid(row=3, col=1, **padding)

What about a function:

def grid_with_padding(widget, padx='1m', pady='1m', **kw):
   widget.grid(padx=padx, pady=pady, **kw)

If you want an uniform padding:

def add_padding(container, padx='1m', pady='1m'):
   nc, nr = container.grid_size()
   for i in range(nc):
     container.grid_columnconfigure(i, pad=padx)
   for i in range(nr):
     container.grid_rowconfigure(i, pad=pady)

-- 
Gabriel Genellina



From google at mrabarnett.plus.com  Mon May  4 11:09:16 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 16:09:16 +0100
Subject: find sublist inside list
In-Reply-To: <gtmsf0$se7$1@amma.irisa.fr>
References: <gtmlsk$q51$1@amma.irisa.fr>	<mailman.5041.1241442097.11746.python-list@python.org>	<c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com>
	<gtmsf0$se7$1@amma.irisa.fr>
Message-ID: <49FF051C.9080209@mrabarnett.plus.com>

Matthias Gall? wrote:
> bearophileHUGS at lycos.com wrote:
>> John O'Hagan:
>>> li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
>>> for i  in range(len(li)):
>>>     if li[i:i + 2] == ['a', 'c']:
>>>         li[i:i + 2] = ['6']
>>
>> Oh well, I have done a mistake, it seems.
>> Another solution then:
>>
>>>>> 'acaccgac'.replace("ac", chr(6))
>> '\x06\x06cg\x06'
>>
>> Bye,
>> bearophile
> 
> Thanks bearophile and John for your quick answers.
> Unfortunately, the int that can replace a sublist can be > 255, but 
> John's answer looks simple and good enough for me. I will use it as a 
> starting point.
> 
John's solution changes the length of the list over which it's
iterating.

I'd suggest something more like:

     li = ['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
     pos = 0
     try:
         while True:
             pos = li.index('a', pos)
             if li[pos : pos + 2] == ['a', 'c']:
                 li[pos : pos + 2] = [6]
             pos += 1
     except ValueError:
         pass


From amrbekhit at gmail.com  Mon May  4 11:10:38 2009
From: amrbekhit at gmail.com (Amr)
Date: Mon, 4 May 2009 08:10:38 -0700 (PDT)
Subject: Default padding for Tkinter grid
References: <e534085e-8f6a-46e9-82d8-316eccfbf8f1@u10g2000vbd.googlegroups.com>
	<mailman.5051.1241449065.11746.python-list@python.org>
Message-ID: <2c838b86-4eb3-4ca9-9ea5-6b0d23064d9b@v17g2000vbb.googlegroups.com>

On May 4, 3:57?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Mon, 04 May 2009 10:27:49 -0300, Amr <amrbek... at gmail.com> escribi?:
>
> > I've been spending the last few days experimenting with Tkinter. The
> > grid manager is nice and easy to use, but I have found that I am often
> > having to specify padx and pady options to every widget I add to my
> > grid. The way I am doing it is to create a dictionary:
>
> > paddding = {'padx': '1m', 'pady': '1m'}
>
> > and then apply it to the grid method using **padding.
>
> > However, I was wondering if there was a way of setting default padx
> > and pady controls for the grid, so that I can just call grid without
> > having to specify any extra parameters.
>
> You have to call grid() once on every widget, so adding **padding at the ?
> end doesn't appear too bad to me:
>
> ? ?label = Label(master, text="Hello world!")
> ? ?widget.grid(row=3, col=1, **padding)
>
> What about a function:
>
> def grid_with_padding(widget, padx='1m', pady='1m', **kw):
> ? ?widget.grid(padx=padx, pady=pady, **kw)
>
> If you want an uniform padding:
>
> def add_padding(container, padx='1m', pady='1m'):
> ? ?nc, nr = container.grid_size()
> ? ?for i in range(nc):
> ? ? ?container.grid_columnconfigure(i, pad=padx)
> ? ?for i in range(nr):
> ? ? ?container.grid_rowconfigure(i, pad=pady)
>
> --
> Gabriel Genellina

Hi Gabriel,

Thanks for your reply - I like the method you mention at the end,
using grid_columnconfigure and grid_rowconfigure as I can use that to
apply setting to the whole grid at the end. I'll have a mess around
with it.

--Amr


From soumen08 at gmail.com  Mon May  4 11:13:43 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Mon, 4 May 2009 20:43:43 +0530
Subject: IDE for python 2.6 (auto complete)
Message-ID: <f6a09c160905040813w6351f11bo41c0198835f7ece5@mail.gmail.com>

Hello,
I have just installed and run python 2.6.2 from the sources available
on the website. I notice that SPE (the editor which i used with python
2.5) is not displaying some of the functions new in 2.6 as
autocomplete options. Is there any IDE with support for autocomplete
in python 2.6 with all the newer functions included?


From showell30 at yahoo.com  Mon May  4 11:27:06 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 4 May 2009 08:27:06 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
Message-ID: <40fbffe5-a9dc-4a8c-a239-fa546c5ff2ef@z19g2000vbz.googlegroups.com>

On May 3, 3:39?pm, bearophileH... at lycos.com wrote:
> Sometimes I rename recursive functions, or I duplicate&modify them,
> and they stop working because inside them there's one or more copy of
> their old name.
> This happens to me more than one time every year.
> So I have written this:
>
> from inspect import getframeinfo, currentframe
>
> def SOMEVERYUGLYNAME(n):
> ? ? if n <= 1:
> ? ? ? ? return 1
> ? ? else:
> ? ? ? ? self_name = getframeinfo(currentframe()).function
> ? ? ? ? #self_name = getframeinfo(currentframe())[2] # older python
>
> ? ? ? ? # only if it's a global function
> ? ? ? ? #return n * globals()[self_name](n - 1)
> ? ? ? ? return n * eval(self_name + "(%d)" % (n - 1))
> assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6
>
> Are there nicer ways to do that? I don't know.
> If there aren't, then a way may be added.
> An idea-syntax:
>
> def fact(n):
> ? ? return 1 if n <= 1 else n * inspect.self(n - 1)
>
> Or even a lambda, because you don't need the name anymore to call the
> function:
>
> fact = lambda n: 1 if n <= 1 else n * self(n - 1)
>
> (If you have two or more recursive functions that call each other this
> idea can't be used, but I think such situations are uncommon enough to
> not deserve help from the language).
>

One very simple thing that you can do is assign the current function
name to a local var at the very top to make it a little more obvious.

I agree that there are lots of recursive patterns where python itself
does not provide much sugar.  A pattern that comes up for me
occasionally is two methods with almost identical names, where one
function is the public interface and then another method that does
most of the recursion.


From kyosohma at gmail.com  Mon May  4 11:46:03 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 4 May 2009 08:46:03 -0700 (PDT)
Subject: IDE for python 2.6 (auto complete)
References: <mailman.5053.1241450027.11746.python-list@python.org>
Message-ID: <6e840938-6180-44a8-8a1e-7f1660cfa2af@n8g2000vbb.googlegroups.com>

On May 4, 10:13?am, Soumen banerjee <soume... at gmail.com> wrote:
> Hello,
> I have just installed and run python 2.6.2 from the sources available
> on the website. I notice that SPE (the editor which i used with python
> 2.5) is not displaying some of the functions new in 2.6 as
> autocomplete options. Is there any IDE with support for autocomplete
> in python 2.6 with all the newer functions included?

Wingware probably does. You should just submit a bug report to Stani
though. He can probably fix SPE for you.

Mike


From ross.jett at gmail.com  Mon May  4 12:01:05 2009
From: ross.jett at gmail.com (Ross)
Date: Mon, 4 May 2009 09:01:05 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<a4aadd59-1d8a-40e0-b69d-d1d0ef9e01cf@x31g2000prc.googlegroups.com>
Message-ID: <4e49873c-9e74-4a3f-9070-2f245e6467c2@e20g2000vbc.googlegroups.com>

On May 3, 8:29?pm, John Machin <sjmac... at lexicon.net> wrote:
> On May 4, 12:36?pm, Ross <ross.j... at gmail.com> wrote:
>
>
>
> > For the past couple weeks, I've been working on an algorithm to
> > schedule tennis leagues given court constraints and league
> > considerations (i.e. whether it's a singles or a doubles league). Here
> > were my requirements when I was designing this algorithm:
>
> > -Each player plays against a unique opponent each week.
> > -Similarly, in a doubles league, each player plays with a unique
> > partner each week.
> > -Each player gets a fair number of bye weeks (i.e. the player with the
> > most bye weeks will have no more than one bye week than the player
> > with the least number of bye weeks)
>
> > I'm very close to arriving at my desired solution, but I have one
> > glaring flaw. When I have an even number of players sign up for my
> > league and there are court constraints, my current algorithm gives the
> > first player in my league a bye week every single week. I'll post my
> > code below and see how you guys think I should add to/ amend my code.
>
> > def round_robin(players, rounds):
> > ? ? if len(players)%2:
> > ? ? ? ? players.insert(0, None)
> > ? ? mid = len(players)//2
> > ? ? for i in range(rounds):
> > ? ? ? ? yield zip(players[:mid], players[mid:])
> > ? ? ? ? players = players[0:1] + players[mid:mid+1] + players[1:mid-1] +
> > players[mid+1:] + players[mid-1:mid]
>
> > def test_round_robin(players, rounds, courts, doubles = False):
> > ? ? players = range(players)
>
> DON'T change the type/contents/meaning of a variable name like that.
> E.g. use "nthings" for a number of things and "things" for a
> collection of things.
>
> > ? ? for week in round_robin(players,rounds,courts):
>
> The round_robin() function has only TWO arguments. This code won't
> even run.
>
> When you document neither your data structures nor what your functions
> are intended to do, the last hope for somebody trying to make sense of
> your code is to give meaningful names to your variables. "week" and
> "doubles_week" are NOT meaningful.
>
> > ? ? ? ? ? ? if doubles == True:
>
> Bletch. s/ == True//
>
> > ? ? ? ? ? ? ? ? ? ? doubles_week = len(week)/2.0
>
> I doubt very much that using floating point is a good idea here.
>
> > ? ? ? ? ? ? ? ? ? ? byes = doubles_week - courts
> > ? ? ? ? ? ? ? ? ? ? if byes == 0:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = []
> > ? ? ? ? ? ? ? ? ? ? else:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
>
> The derivation of the constants 1.072 and 1.08 is .... what?
>
> > ? ? ? ? ? ? ? ? ? ? playing = [u for u in week if u not in bye_list]
> > ? ? ? ? ? ? ? ? ? ? midd = len(playing)//2
> > ? ? ? ? ? ? ? ? ? ? doub_sched = zip(playing[:midd], playing[midd:])
> > ? ? ? ? ? ? ? ? ? ? print doub_sched, bye_list
> > ? ? ? ? ? ? else:
> > ? ? ? ? ? ? ? ? ? ? byes = len(week)- courts
> > ? ? ? ? ? ? ? ? ? ? if byes == 0:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = []
> > ? ? ? ? ? ? ? ? ? ? else:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
> > ? ? ? ? ? ? ? ? ? ? playing = [u for u in week if u not in bye_list]
> > ? ? ? ? ? ? ? ? ? ? print playing, bye_list

For everybody's enlightenment, I have gone through and commented my
code so you can better understand what I'm doing. Here it is:

def round_robin(players, rounds):
    # if number of players odd, insert None at first position
    if len(players)%2:
	players.insert(0, None)
    mid = len(players)//2
    for i in range(rounds):
	yield zip(players[:mid], players[mid:])
	players = players[0:1] + players[mid:mid+1] + players[1:mid-1] +
players[mid+1:] + players[mid-1:mid]
""" rotates players like this: 1 2  ->  3 -> 4

                                         /            |

                                       5 <- 6 <-7 <- 8 """

def test_round_robin(players, rounds, courts, doubles = False):
    players = range(players)
    for week in round_robin(players,rounds):
	    if doubles == True: #for doubles pairings
		    doubles_week = len(week)/2.0
		    byes = doubles_week - courts #number of tuples to be put into
bye_list
		    if byes == 0:
			    bye_list = []
		    else: """ following formula equally spaces out tuples selected
for bye_list and selects appropriate number according to length of the
league"""
			    bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
		    playing = [u for u in week if u not in bye_list]
		    midd = len(playing)//2
		    doub_sched = zip(playing[:midd], playing[midd:])#matches the
remaining tuples into doubles matches
		    print doub_sched, bye_list
	    else:
		    byes = len(week)- courts
		    if byes == 0:
			    bye_list = []
		    else:
			    bye_list = week[::int(round(1.072*(courts/byes)+1.08))]
		    playing = [u for u in week if u not in bye_list]
		    print playing, bye_list


From mabdelkader at gmail.com  Mon May  4 12:03:42 2009
From: mabdelkader at gmail.com (ma)
Date: Mon, 4 May 2009 12:03:42 -0400
Subject: fcntl and siginfo_t in python
In-Reply-To: <148918f0905011208u4946c377uce7603bb2e456370@mail.gmail.com>
References: <148918f0904281356v534680dcmd03084fe255cb2d3@mail.gmail.com> 
	<op.us4mtvitx6zn5v@lepton.softlabbsas.com.ar>
	<148918f0904291012j4c1ada35jcee6030b75b952d0@mail.gmail.com> 
	<loom.20090430T233215-925@post.gmane.org>
	<148918f0904301637t5e63537atd85e2a475f4e069f@mail.gmail.com> 
	<148918f0905011208u4946c377uce7603bb2e456370@mail.gmail.com>
Message-ID: <148918f0905040903s7a5c7e5exc2968d0e65540d81@mail.gmail.com>

Ok! So, I decided to write a C-extension instead of using ctypes. So
far, I create a module called dnotifier and the handler callback
receives two arguments, the signal number and the respective file
descriptor that was modified.

This works beautifully. Now, I want to release this to the public, so
I'm thinking of making a bit of code cleanup. Should I just pack the
entire siginfo_t struct, right now I just use the fd, into a
dictionary and pass it to the python callback handler function? Maybe
there might be some more suggestions to what data structures to use,
so I'm open right now to any of them.

The siginfo_t structure is defined as follows in C:

union sigval {
	int sival_int;
	void *sival_ptr;
};

typedef struct {
	int si_signo;
	int si_code;
	union sigval si_value;
	int si_errno;
	pid_t si_pid;
	uid_t si_uid;
	void *si_addr;
	int si_status;
	int si_band;
} siginfo_t;

Thanks,
Mahmoud



On Fri, May 1, 2009 at 3:08 PM, ma <mabdelkader at gmail.com> wrote:
>
> According to man signal,
> "The default action for an unhandled real-time signal is to terminate
> the receiving process."
>
> This means that my registered callback and sigaction does not work. I
> think the only solution would be to try this with a C-extension. Has
> anyone had any experience with this before?
>
> I attached my latest copy. Any insight is appreciated.
>
> On Thu, Apr 30, 2009 at 7:37 PM, ma <mabdelkader at gmail.com> wrote:
> > I attached a clean copy of the .py file in case others couldn't read
> > it in their emails.
> > I'll try that and let you know how?SIGRTMIN+1 goes!
> > What about this part?
> >
> > #sigemptyset(&act.sa_mask);
> > #python2.6 has byref(act, offset),how can i port this over?
> > #maybe addressof(act)+sizeof(sigaction.sa_mask)*(position_in_sigaction)
> > rc = __clib.sigemptyset(byref(act))
> >
> > Thanks!
> > Mahmoud
> >
> >
> >
> > On Thu, Apr 30, 2009 at 7:33 PM, Philip <philip at subaru.naoj.org> wrote:
> >>
> >> ma <mabdelkader <at> gmail.com> writes:
> >>
> >> >
> >> >
> >> >
> >> >
> >> > Here's something that I came up with so far, I'm having some issues with
> >> segfaulting, if I want to pass a struct member by ref in ctypes(see below), if
> >> not, I just get a
> >> > "Real-time signal 0" sent back to me.
> >> >
> >> >
> >> > Any ideas?
> >>
> >> Try "SIGRTMIN+1", per http://souptonuts.sourceforge.net/code/dnotify.c.html
> >>
> >> Philip
> >>
> >>
> >>
> >> --
> >> http://mail.python.org/mailman/listinfo/python-list
> >


From matt at tplus1.com  Mon May  4 12:07:21 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Mon, 04 May 2009 16:07:21 GMT
Subject: How to walk up parent directories?
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
	<87ocu9k6c4.fsf@benfinney.id.au>
Message-ID: <ZoELl.21595$as4.10585@nlpi069.nbdc.sbc.com>

On Sun 03 May 2009 09:24:59 PM EDT, Ben Finney wrote:
> Not every simple function belongs in the standard library :-)

Thanks for the help with this!  Maybe I'm overestimating how often
people need this walkup function.

Matt


From velvetyuan at gmail.com  Mon May  4 12:14:28 2009
From: velvetyuan at gmail.com (Allan Yuan)
Date: Tue, 5 May 2009 00:14:28 +0800
Subject: Your confirmation is required to join the Python-list mailing 
	list
In-Reply-To: <mailman.0.1241452418.13411.python-list@python.org>
References: <mailman.0.1241452418.13411.python-list@python.org>
Message-ID: <7be934440905040914t699a0e70s62671f299961ac6@mail.gmail.com>

Hi,
I just wanna know how to set SYSTEM variables and USER variables of windows,
but got no way.

Firstly I thought "os.environ + os.system" may work well, but found no way
to let "os.environ" run to retrive USER variables.

Then I tried win32api, finding the GetEnvironmentVariables() mixing SYSTEM
and USER variables up, and SetEnvironmentVariables() failing to add
variables.

Could you help me, please?
Thanks a lot.
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From aahz at pythoncraft.com  Mon May  4 12:15:18 2009
From: aahz at pythoncraft.com (Aahz)
Date: 4 May 2009 09:15:18 -0700
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
Message-ID: <gtn4am$89$1@panix3.panix.com>

In article <8d4ec1df-dddb-469a-99a1-695152db7c04 at n4g2000vba.googlegroups.com>,
Ross  <ross.jett at gmail.com> wrote:
>
>def test_round_robin(players, rounds, courts, doubles = False):
>    players = range(players)
>    for week in round_robin(players,rounds,courts):
>	    if doubles == True:
>		    doubles_week = len(week)/2.0
>		    byes = doubles_week - courts

Side note: thou shalt indent four spaces, no more, no fewer

For more info, see PEP 8.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From aahz at pythoncraft.com  Mon May  4 12:25:17 2009
From: aahz at pythoncraft.com (Aahz)
Date: 4 May 2009 09:25:17 -0700
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
Message-ID: <gtn4td$83h$1@panix3.panix.com>

In article <gtmlsk$q51$1 at amma.irisa.fr>,
=?ISO-8859-1?Q?Matthias_Gall=E9?=  <mgalle at irisa.fr> wrote:
>
>My problem is to replace all occurrences of a sublist with a new element.
>
>Example:
>Given ['a','c','a','c','c','g','a','c'] I want to replace all 
>occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).

What's your goal?  After you do this once, you cannot repeat the
operation with a different sublist because you are not tracking the
source of the numbers.  You might look into standard compression
algorithms for information about how to accomplish this.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From oshecho at gmail.com  Mon May  4 12:58:57 2009
From: oshecho at gmail.com (Echo)
Date: Mon, 4 May 2009 12:58:57 -0400
Subject: How is the start of my server monitoring code?
Message-ID: <910885da0905040958n1b62361ei4633d2b86fb3adae@mail.gmail.com>

I just started a project to monitor servers(load, memory, processes,
etc) via ssh(using?paramiko). And I was hoping to get some input on
the design of my project, how pythonic it is, etc. It is quite basic
right now. But it is currently able to get load and memory stats from
any number of servers. I haven't started the logging to a DB or the
GUI for it yet. I also haven't touched on error handling at all
either.

My reasons for making my own server monitoring project:
-It's fun
-Low requirements (only python, paramiko, and pycrypto 1.9+ is required)
-Nothing to install on the servers
-Easy to customize

You can view the code at:
http://github.com/brandonsinger/pywatchlmn/blob/43afb593a891a3d25f3cd9910c5829867bbe229d/monitor.py
The project page is at: http://github.com/brandonsinger/pywatchlmn/tree/master

--
-Brandon Singer


From v+python at g.nevcal.com  Mon May  4 13:09:42 2009
From: v+python at g.nevcal.com (Glenn Linderman)
Date: Mon, 04 May 2009 10:09:42 -0700
Subject: [ANN] regobj - Pythonic object-based access to the Windows
	Registry
In-Reply-To: <1241361308.4359.9.camel@mango>
References: <1241361308.4359.9.camel@mango>
Message-ID: <49FF2156.6010909@g.nevcal.com>

On approximately 5/3/2009 7:35 AM, came the following characters from 
the keyboard of Ryan Kelly:
> Hi All,
> 
>   I've just released the results of a nice Sunday's coding, inspired by
> one too many turns at futzing around with the _winreg module.  The
> "regobj" module brings a convenient and clean object-based API for
> accessing the Windows Registry.


Sounds very interesting, Ryan.  Just a couple questions about the 
dictionary interface.


> If a subkey is assigned a dictionary, the structure of that dictionary
> is copied into the subkey.  Scalar values become key values, while
> nested  dictionaries create subkeys:
> 
>   >>> HKCU.Software.MyTests = {"val1":7, "stuff":{"a":1,"c":2,"e":3}}
>   >>> [v.name for v in HKCU.Software.MyTests.values()]
>   ['val1']
>   >>> [k.name for k in HKCU.Software.MyTests.subkeys()]
>   ['stuff']
>   >>> len(HKCU.Software.MyTests.stuff)
>   3
> 
> Any other value assigned to a subkey will become the default value for
> that key (i.e. the value with name ""):
> 
>   >>> HKCU.Software.MyTests = "dead parrot"
>   >>> HKCU.Software.MyTests[""].data
>   u'dead parrot'


I could see how you could map  numbers to DWORD, 2.x str/3.x bytes to 
binary, and 2.x unicode/3.x str to REG_SZ.  But you don't document such 
a translation, so it is unclear exactly what you actually do.  This 
would be somewhat weird in 2.x, though, where str commonly would want to 
map to String rather than Binary.

It seems almost necessary to add an explanation of whatever mapping is 
presently done, to have complete documentation.



Thinking more, I wonder if it is possible to create objects of type 
Value to put in the dictionary to allow specification of multistring and 
expandablestring Registry types, but then the dictionary name would have 
to be redundant with the name attribute in the Value object.  Maybe a 
nameless value type could be invented, with just type and data attributes?

Then the dictionary could be populated with numbers (mapped to DWORD) 
str or unicode items (mapped to String), [3.x only] bytes (mapped to 
Binary), or nameless value objects (which map to their internal types).



This would allow a bidirectional conversion between dictionaries and 
registry keys... when asking for the value of a key, one could return a 
dictionary of nameless value types... and allow iterations over that.

Subkeys could be a tuple with the type of key, and the value of a key 
object.


Well, these are just thoughts.  I don't know if they would increase or 
decrease the Pythonicity of your design, which certainly sounds better 
than using _winreg, to me.


-- 
Glenn -- http://nevcal.com/
===========================
A protocol is complete when there is nothing left to remove.
-- Stuart Cheshire, Apple Computer, regarding Zero Configuration Networking


From aahz at pythoncraft.com  Mon May  4 13:17:05 2009
From: aahz at pythoncraft.com (Aahz)
Date: 4 May 2009 10:17:05 -0700
Subject: replacing numbers in LARGE MATRIX with criterium in 2 columns
	(a--> b)
References: <68d22002-fc0a-4590-9395-c78b6ee412b2@r34g2000vba.googlegroups.com>
Message-ID: <gtn7uh$ikk$1@panix3.panix.com>

In article <68d22002-fc0a-4590-9395-c78b6ee412b2 at r34g2000vba.googlegroups.com>,
Alexzive  <zasaconsulting at gmail.com> wrote:
>
>I have this matrix [20*4 - but it could be n*4 , with n~100,000] in
>file "EL_list" like this:

Take a look at NumPy
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From detlev at die-offenbachs.de  Mon May  4 13:29:36 2009
From: detlev at die-offenbachs.de (Detlev Offenbach)
Date: Mon, 04 May 2009 19:29:36 +0200
Subject: IDE for python 2.6 (auto complete)
References: <mailman.5053.1241450027.11746.python-list@python.org>
	<6e840938-6180-44a8-8a1e-7f1660cfa2af@n8g2000vbb.googlegroups.com>
Message-ID: <gtn8m0$5ek$1@online.de>

Mike Driscoll wrote:

> On May 4, 10:13?am, Soumen banerjee <soume... at gmail.com> wrote:
>> Hello,
>> I have just installed and run python 2.6.2 from the sources available
>> on the website. I notice that SPE (the editor which i used with python
>> 2.5) is not displaying some of the functions new in 2.6 as
>> autocomplete options. Is there any IDE with support for autocomplete
>> in python 2.6 with all the newer functions included?
> 
> Wingware probably does. You should just submit a bug report to Stani
> though. He can probably fix SPE for you.

And eric4 does this as well.

Detlev
-- 
Detlev Offenbach
detlev at die-offenbachs.de


From Florian.Wollenschein at FernUni-Hagen.de  Mon May  4 13:31:38 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Mon, 04 May 2009 19:31:38 +0200
Subject: Open a dialog from MainWindow - pyQT4 - Beginner :-)
Message-ID: <gtn8q6$e55$1@news-cedar.fernuni-hagen.de>

Dear folks,

I'm just working on a pyQT4 version of my txt to html converter thc (see 
listick.org for details).

I created the MainWindow with QT Designer and then converted it to .py 
with pyuic4. It works well so far. Then I created a new UI for my 
abtDialog (about dialog for my application). I did the same as with the 
MainWindow, so I have two UIs and two *_ui.py files now. How can I open 
the dialog from my main application class?

Here's part of the code I'm using:

...
self.connect(self.actionAbout,
                 QtCore.SIGNAL("triggered()"), self.OpenAbout)
...
  def OpenAbout(self):
         pass
...

The OpenAbout function should open the dialog. I've already tried a 
abtDialog.show() after creating it via abtDialog = ThcAboutDialog() 
(ThcAboutDialog is the class for this dlg).

Any ideas?

Thanks,
Listick Lorch
http://www.listick.org

PS: Keep in mind that I'm quite a beginner in the field of python and qt...


From mail at johnohagan.com  Mon May  4 13:33:40 2009
From: mail at johnohagan.com (John O'Hagan)
Date: Mon, 4 May 2009 17:33:40 +0000
Subject: find sublist inside list
In-Reply-To: <79b79e730905040613y5ba8e36wb27e66260f06247@mail.gmail.com>
References: <gtmlsk$q51$1@amma.irisa.fr>
	<200905041301.36962.mail@johnohagan.com>
	<79b79e730905040613y5ba8e36wb27e66260f06247@mail.gmail.com>
Message-ID: <200905041733.41172.mail@johnohagan.com>

On Mon, 4 May 2009, Francesco Guerrieri wrote:
> On Mon, May 4, 2009 at 3:01 PM, John O'Hagan <mail at johnohagan.com> wrote:
> > On Mon, 4 May 2009, Matthias Gall? wrote:
> > > Hi.
> > >
> > > My problem is to replace all occurrences of a sublist with a new
> > > element.
> > >
> > > Example:
> > > Given ['a','c','a','c','c','g','a','c'] I want to replace all
> > > occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).
> >
> > li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
> > for i  in range(len(li)):
> >    if li[i:i + 2] == ['a', 'c']:
> >        li[i:i + 2] = ['6']
> >
> > HTH,
> >
> > John
>
> Beware that you are mutating the list you are iterating over. That could
> lead to some strange bugs (for instance if you replaced the deleted items
> with a longer sequence, the range(len(li)) would still go up to the
> original lenght).
> It is better to modify a new list instead. Eg you could append to a new
> list.
[...]

Quite right, while it happens to work in this particular example, as you and 
MRAB point out, it's generally dangerous (and in fact this one silently and 
uselessly iterates over the last couple of indexes which no longer exist); a 
new list could be created like this:

index=0
newli=[]
while index<len(li):
    if li[index:index+2]==['a', 'c']:
        newli.append(6)
        index += 2
    else:
        newli.append(li[index])
        index += 1

Regards,

John




From debatem1 at gmail.com  Mon May  4 13:36:34 2009
From: debatem1 at gmail.com (CTO)
Date: Mon, 4 May 2009 10:36:34 -0700 (PDT)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
	<bea7d12e-2bda-4ec6-868b-440b79bd28e4@21g2000vbk.googlegroups.com> 
	<mailman.5014.1241386734.11746.python-list@python.org>
	<4b87a84a-eef0-42cb-91f7-6ade662bdd4d@t10g2000vbg.googlegroups.com>
	<767pt4F1ai5lsU1@mid.uni-berlin.de>
Message-ID: <dfd5cc95-173d-40d4-b7f4-a4e4f351dfb3@l28g2000vba.googlegroups.com>

> Which brings us backs to the "20 questions"-part of my earlier post. It
> could be, but it could also be that processing takes seconds. Or it takes
> so long that even concurrency won't help. Who knows?

Probably the OP ;)

Geremy Condra



From grettke at gmail.com  Mon May  4 14:06:06 2009
From: grettke at gmail.com (Grant Rettke)
Date: Mon, 4 May 2009 11:06:06 -0700 (PDT)
Subject: Personal recommendations for Python and Django on-boarding materials
Message-ID: <61ac6511-0f9e-458d-b3f1-5b153939293f@r34g2000vba.googlegroups.com>

Hi folks,

>From one developer to another, I am looking for some personal
recommendations on what are the best materials for fast tracking an on-
boarding to Python and Django.

I know how to program, get web apps and OO; this is the audience.

I have found some good recommendations and stuff on Amazon and various
websites, but if I could get some humans vouching for things directly
that would be worth a lot more.

Best wishes,

Grant


From jsanga at cox.net  Mon May  4 14:12:41 2009
From: jsanga at cox.net (mzdude)
Date: Mon, 4 May 2009 11:12:41 -0700 (PDT)
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
	<mailman.5041.1241442097.11746.python-list@python.org> 
	<c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com> 
	<gtmsf0$se7$1@amma.irisa.fr>
Message-ID: <b1f47eb5-22a6-491c-b6db-bda94c934b23@l28g2000vba.googlegroups.com>

On May 4, 9:01?am, Matthias Gall? <mga... at irisa.fr> wrote:
> bearophileH... at lycos.com wrote:
> > John O'Hagan:
> >> li=['a', 'c', 'a', 'c', 'c', 'g', 'a', 'c']
> >> for i ?in range(len(li)):
> >> ? ? if li[i:i + 2] == ['a', 'c']:
> >> ? ? ? ? li[i:i + 2] = ['6']
>
> > Oh well, I have done a mistake, it seems.
> > Another solution then:
>
> >>>> 'acaccgac'.replace("ac", chr(6))
> > '\x06\x06cg\x06'
>
> > Bye,
> > bearophile
>
> Thanks bearophile and John for your quick answers.
> Unfortunately, the int that can replace a sublist can be > 255, but
> John's answer looks simple and good enough for me. I will use it as a
> starting point.
>

substring isn't limited to 0..255
>>> substring = "\0x%d\0x%d" % (257,257)
>>> 'acaccgac'.replace("ac", substring)
'\x00x257\x00x257\x00x257\x00x257cg\x00x257\x00x257'


From grahamdick77 at gmail.com  Mon May  4 14:15:13 2009
From: grahamdick77 at gmail.com (grahamdick77 at gmail.com)
Date: Mon, 4 May 2009 11:15:13 -0700 (PDT)
Subject: improved search algorithm
Message-ID: <ab9b08e3-63d6-4519-b6d7-fb4d964734c7@g20g2000vba.googlegroups.com>

Hi

I have an excel file that is read into python (8000 rows)

from csv        import reader, writer
incsv = reader(open(MY_FILE), dialect='excel')
keys = incsv.next()

There are mixed datatypes.

the last column contains a cumulative frequency running in order
0.0000 to 1.0000 for the 8000 rows

for a loop of 100,000 times I want to take a new random number each
time and find the row with the next biggest cumulative frequency value

Here's my current (pseudo)code:

for 1 to 100000

myRand = random.random()
for line in incsv:
            if float(line[-1]) > myRand:
                resline = []
                for item in line:
                    try:
                        i = int(item)
                    except ValueError:
                        try:
                            i = float(item)
                        except ValueError:
                            i = item
                    resline.append(i)
                #Here we construct a dict of pair values:
                #{'ID':18,...
                res = dict(zip(keys,resline))
                break
            else:
                continue

      #do some stuff with res




I'm scanning over each line of the csv and deciding which row to
select (100k times) this is just not very efficient

How can i improve this code.
for line in incsv:
            if float(line[-1]) > random.random():

I can use numpy etc. whatever


From bearophileHUGS at lycos.com  Mon May  4 14:26:25 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 11:26:25 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<40fbffe5-a9dc-4a8c-a239-fa546c5ff2ef@z19g2000vbz.googlegroups.com>
Message-ID: <202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>

Steve Howell:
>two methods with almost identical names, where one function is the public interface and then another method that does most of the recursion.<

Thanks Guido & Walter both Python and D support nested functions, so
in such situations I put the recursive function inside the "public
interface" function/method.

Recursion is a high-level way to represent certain kinds of algorithms
in a short and readable way (when data structures are nested, the most
natural algorithms that work on them are recursive). But in Python
function calls are slow, the maximum level of nested calls is limited
(and it can't grow too much), so this has sometimes forced me to
manually convert recursive functions into iterative ones with a stack.
This is silly for a supposed high-level language. The bad support for
recursivity is one of the few faults of Python.

Bye,
bearophile


From qhfgva at gmail.com  Mon May  4 14:27:13 2009
From: qhfgva at gmail.com (qhfgva)
Date: Mon, 4 May 2009 11:27:13 -0700 (PDT)
Subject: pychecker vs pychecker2
Message-ID: <c4529fae-7d75-429d-87ef-8210969c2ad8@p6g2000pre.googlegroups.com>

For my edification I was looking through the source code of
pychecker.  I noticed that there was also a pychecker2 directory
(ubuntu).  The pychecker command line tool points to pychecker (w/out
the 2).  Does anyone know off the top of their head what this second
directory is about?

thanks

qhfgva


From umut.tabak at gmail.com  Mon May  4 14:42:04 2009
From: umut.tabak at gmail.com (utab)
Date: Mon, 4 May 2009 11:42:04 -0700 (PDT)
Subject: change some lines from a read file
Message-ID: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>

Dear all,

I have to change some lines from a template file, which is rather long
to paste here, but I would like to make some parts of some lines
optional with my command line arguments but I could not see this
directly, I can count the line numbers and decide on this basis to
decide the lines to be configured to my will.

More specifically, say, I have a that file includes

this is an example python file to play around
.
.
.
some lines
.
.
.
. -> an option line for example.
.
.
.
-> another option line so on.

and execute the script
./myScript option1 option2

so that the options at correct locations will be written.

Any other options for this simple job that i can improve my Python a
bit as well.

Best,
Umut


From google at mrabarnett.plus.com  Mon May  4 14:45:23 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 19:45:23 +0100
Subject: improved search algorithm
In-Reply-To: <ab9b08e3-63d6-4519-b6d7-fb4d964734c7@g20g2000vba.googlegroups.com>
References: <ab9b08e3-63d6-4519-b6d7-fb4d964734c7@g20g2000vba.googlegroups.com>
Message-ID: <49FF37C3.2040809@mrabarnett.plus.com>

grahamdick77 at gmail.com wrote:
> Hi
> 
> I have an excel file that is read into python (8000 rows)
> 
> from csv        import reader, writer
> incsv = reader(open(MY_FILE), dialect='excel')
> keys = incsv.next()
> 
> There are mixed datatypes.
> 
> the last column contains a cumulative frequency running in order
> 0.0000 to 1.0000 for the 8000 rows
> 
> for a loop of 100,000 times I want to take a new random number each
> time and find the row with the next biggest cumulative frequency value
> 
> Here's my current (pseudo)code:
> 
> for 1 to 100000
> 
> myRand = random.random()
> for line in incsv:
>             if float(line[-1]) > myRand:
>                 resline = []
>                 for item in line:
>                     try:
>                         i = int(item)
>                     except ValueError:
>                         try:
>                             i = float(item)
>                         except ValueError:
>                             i = item
>                     resline.append(i)
>                 #Here we construct a dict of pair values:
>                 #{'ID':18,...
>                 res = dict(zip(keys,resline))
>                 break
>             else:
>                 continue
> 
>       #do some stuff with res
> 
> 
> 
> 
> I'm scanning over each line of the csv and deciding which row to
> select (100k times) this is just not very efficient
> 
> How can i improve this code.
> for line in incsv:
>             if float(line[-1]) > random.random():
> 
> I can use numpy etc. whatever
> 
Here's a suggestion:

Construct the dicts for all the rows, stored in a list.

Construct a list of just the cumulative frequencies.

For each random value, use the bisect module to search for the value in
the cumulative frequencies list. This will return an index which you can
then use on your list of dicts.


From arnodel at googlemail.com  Mon May  4 14:51:03 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 04 May 2009 19:51:03 +0100
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<40fbffe5-a9dc-4a8c-a239-fa546c5ff2ef@z19g2000vbz.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
Message-ID: <m2ocu8r9bc.fsf@googlemail.com>

bearophileHUGS at lycos.com writes:

> Steve Howell:
>>two methods with almost identical names, where one function is the
>>public interface and then another method that does most of the
>>recursion.<
>
> Thanks Guido & Walter both Python and D support nested functions, so
> in such situations I put the recursive function inside the "public
> interface" function/method.

Yes, this is a common idiom for me:

def public_function(a, b):
    def rec():
        ...
    return rec()

E.g, to continue with the factorial toy example (of course for this
particular example and in this particular language, a loop would be more
appropriate):

def fac(n):
    def rec(n, acc):
        if n <= 1:
            return acc
        else:
            return rec(n - 1, n*acc)
    return rec(n, 1)

This is tail recursive, but Python does not optimise tail-calls so there
is not much point.

> Recursion is a high-level way to represent certain kinds of algorithms
> in a short and readable way (when data structures are nested, the most
> natural algorithms that work on them are recursive). But in Python
> function calls are slow, the maximum level of nested calls is limited
> (and it can't grow too much), so this has sometimes forced me to
> manually convert recursive functions into iterative ones with a stack.
> This is silly for a supposed high-level language. The bad support for
> recursivity is one of the few faults of Python.

Bearophile, there is a thread on python-ideas about tail-call
optimization at the moment.

-- 
Arnaud


From google at mrabarnett.plus.com  Mon May  4 14:59:37 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 19:59:37 +0100
Subject: change some lines from a read file
In-Reply-To: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
References: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
Message-ID: <49FF3B19.7070907@mrabarnett.plus.com>

utab wrote:
> Dear all,
> 
> I have to change some lines from a template file, which is rather long
> to paste here, but I would like to make some parts of some lines
> optional with my command line arguments but I could not see this
> directly, I can count the line numbers and decide on this basis to
> decide the lines to be configured to my will.
> 
> More specifically, say, I have a that file includes
> 
> this is an example python file to play around
> .
> .
> .
> some lines
> .
> .
> .
> . -> an option line for example.
> .
> .
> .
> -> another option line so on.
> 
> and execute the script
> ./myScript option1 option2
> 
> so that the options at correct locations will be written.
> 
> Any other options for this simple job that i can improve my Python a
> bit as well.
> 
You could put special markers around the optional parts in the template
file. Your script would remove the markers from around the optional
parts it wants to keep and then remove any remaining unwanted optional
parts and their markers.


From bearophileHUGS at lycos.com  Mon May  4 15:12:19 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 12:12:19 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<40fbffe5-a9dc-4a8c-a239-fa546c5ff2ef@z19g2000vbz.googlegroups.com> 
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
Message-ID: <cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>

Arnaud Delobelle:
> def fac(n):
> ? ? def rec(n, acc):
> ? ? ? ? if n <= 1:
> ? ? ? ? ? ? return acc
> ? ? ? ? else:
> ? ? ? ? ? ? return rec(n - 1, n*acc)
> ? ? return rec(n, 1)

Right, that's another way to partially solve the problem I was talking
about. (Unfortunately the performance in Python is significantly
lower. I can use that in D).


> Bearophile, there is a thread on python-ideas about tail-call
> optimization at the moment.

Someday I'll have to start following those mailing lists...
But I am not interested in such optimization. It's not going to help
me significantly. Most times I use recursion, I think it can't be
optimized away by simple means (think about a visit to a binary tree).

Bye,
bearophile


From aahz at pythoncraft.com  Mon May  4 15:50:18 2009
From: aahz at pythoncraft.com (Aahz)
Date: 4 May 2009 12:50:18 -0700
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
Message-ID: <gtngtq$m5l$1@panix3.panix.com>

In article <cee041da-a1e0-4d82-b4ba-5404811d3edd at t10g2000vbg.googlegroups.com>,
 <bearophileHUGS at lycos.com> wrote:
>Arnaud Delobelle:
>> 
>> Bearophile, there is a thread on python-ideas about tail-call
>> optimization at the moment.
>
>Someday I'll have to start following those mailing lists...
>But I am not interested in such optimization. It's not going to help
>me significantly. Most times I use recursion, I think it can't be
>optimized away by simple means (think about a visit to a binary tree).

When have you ever had a binary tree a thousand levels deep?  Consider
how big 2**1000 is...
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From arnodel at googlemail.com  Mon May  4 15:51:45 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 04 May 2009 20:51:45 +0100
Subject: Personal recommendations for Python and Django on-boarding
	materials
References: <61ac6511-0f9e-458d-b3f1-5b153939293f@r34g2000vba.googlegroups.com>
Message-ID: <m2k54wr6i6.fsf@googlemail.com>

Grant Rettke <grettke at gmail.com> writes:

> Hi folks,
>
> From one developer to another, I am looking for some personal
> recommendations on what are the best materials for fast tracking an on-
> boarding to Python and Django.
>
> I know how to program, get web apps and OO; this is the audience.
>
> I have found some good recommendations and stuff on Amazon and various
> websites, but if I could get some humans vouching for things directly
> that would be worth a lot more.
>
> Best wishes,
>
> Grant

I've learnt both Python and Django using the tutorials, the docs and
lots of experimentation.  Django now have a book [1] which might be
useful to read.

[1] http://djangobook.com/

-- 
Arnaud



From anthra.norell at bluewin.ch  Mon May  4 16:06:51 2009
From: anthra.norell at bluewin.ch (Anthra Norell)
Date: Mon, 04 May 2009 22:06:51 +0200
Subject: change some lines from a read file
In-Reply-To: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
References: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
Message-ID: <49FF4ADB.5020101@bluewin.ch>

utab wrote:
> Dear all,
>
> I have to change some lines from a template file, which is rather long
> to paste here, but I would like to make some parts of some lines
> optional with my command line arguments but I could not see this
> directly, I can count the line numbers and decide on this basis to
> decide the lines to be configured to my will.
>
> More specifically, say, I have a that file includes
>
> this is an example python file to play around
> .
> .
> .
> some lines
> .
> .
> .
> . -> an option line for example.
> .
> .
> .
> -> another option line so on.
>
> and execute the script
> ./myScript option1 option2
>
> so that the options at correct locations will be written.
>
> Any other options for this simple job that i can improve my Python a
> bit as well.
>
> Best,
> Umut
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   
Your description is not explicit enough to convey your intention. If 
your template file is too long to post, post a short representative 
section, an input data sample and a hand-edited sample of the output 
data you want to generate. You will get more and better advice. .

Frederic



From namekuseijin at gmail.com  Mon May  4 16:18:10 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Mon, 4 May 2009 13:18:10 -0700 (PDT)
Subject: yet another list comprehension question
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
	<gtm1ik$19tj$1@adenine.netfront.net>
	<mailman.5039.1241439352.11746.python-list@python.org>
Message-ID: <f0b70e0d-31c2-4d95-bec4-0e57e5d3a860@o14g2000vbo.googlegroups.com>

On May 4, 9:15?am, David Robinow <drobi... at gmail.com> wrote:
> On Mon, May 4, 2009 at 2:33 AM, namekuseijin
>
> <namekuseijin.nos... at gmail.com> wrote:
> >>>> ls = [(1,2), (3,4), (5, None), (6,7), (8, None)]
> >>>> [(x,y) for (x,y) in ls if y]
> > [(1, 2), (3, 4), (6, 7)]
>
> Nope. That filters out 0 as well as None. Not what the OP asked for.

True.  I'm still a C programmer at heart I guess.  ah, the flexibility
of 0... ;)


From tim.wintle at teamrubber.com  Mon May  4 16:24:36 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 04 May 2009 21:24:36 +0100
Subject: Self function
In-Reply-To: <m2ocu8r9bc.fsf@googlemail.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<40fbffe5-a9dc-4a8c-a239-fa546c5ff2ef@z19g2000vbz.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
Message-ID: <1241468676.7670.11.camel@tim-laptop>

On Mon, 2009-05-04 at 19:51 +0100, Arnaud Delobelle wrote:
> 
> Bearophile, there is a thread on python-ideas about tail-call
> optimization at the moment.

Oooh - haven't noticed that (and don't have time to follow it), but has
anyone seen the results I got a week or so ago from briefly playing with
a couple of simple optimisations:

<http://www.teamrubber.com/blog/python-tail-optimisation-using-byteplay/>

I was amazed how much you could improve performance by not jumping all
over the stack


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From bearophileHUGS at lycos.com  Mon May  4 16:25:59 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 13:25:59 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
Message-ID: <8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>

Aahz:
> When have you ever had a binary tree a thousand levels deep?

Yesterday.


>Consider how big 2**1000 is...<

You are thinking just about complete binary trees.
But consider that a topology like a single linked list (every node has
1 child, and they are chained) is a true binary tree still.

Bye,
bearophile


From ross.jett at gmail.com  Mon May  4 16:27:27 2009
From: ross.jett at gmail.com (Ross)
Date: Mon, 4 May 2009 13:27:27 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<gtn4am$89$1@panix3.panix.com>
Message-ID: <58fea998-acf1-46b5-9328-bc3cbd74f115@n4g2000vba.googlegroups.com>

On May 4, 12:15?pm, a... at pythoncraft.com (Aahz) wrote:
> In article <8d4ec1df-dddb-469a-99a1-695152db7... at n4g2000vba.googlegroups.com>,
>
> Ross ?<ross.j... at gmail.com> wrote:
>
> >def test_round_robin(players, rounds, courts, doubles = False):
> > ? ?players = range(players)
> > ? ?for week in round_robin(players,rounds,courts):
> > ? ? ? ?if doubles == True:
> > ? ? ? ? ? ? ? ?doubles_week = len(week)/2.0
> > ? ? ? ? ? ? ? ?byes = doubles_week - courts
>
> Side note: thou shalt indent four spaces, no more, no fewer
>
> For more info, see PEP 8.
> --
> Aahz (a... at pythoncraft.com) ? ? ? ? ? <*> ? ? ? ?http://www.pythoncraft.com/
>
> "It is easier to optimize correct code than to correct optimized code."
> --Bill Harlan

Yes... I know this. Unfortunately, copy/pasting my code from the IDE
into the google group messes with indentations.


From davea at ieee.org  Mon May  4 16:38:41 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 04 May 2009 16:38:41 -0400
Subject: AutoComplete in C++ Editor for Python
In-Reply-To: <10fef506-2c39-418c-82e8-5c0c05a19e5c@s31g2000vbp.googlegroups.com>
References: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>	<mailman.5011.1241378077.11746.python-list@python.org>
	<10fef506-2c39-418c-82e8-5c0c05a19e5c@s31g2000vbp.googlegroups.com>
Message-ID: <49FF5251.2010303@ieee.org>

flamz3d at gmail.com wrote:
> On May 3, 3:14 pm, Dave Angel <da... at ieee.org> wrote:
>   
>> flam... at gmail.com wrote:
>>     
>>> Hello,
>>> I am embedding python support in my C++ application and was looking at
>>> adding "Intellisense" or "AutoComplete" support.
>>>       
>>> I found a way to do it using the "dir" function, but this creates a
>>> problem. Here's why. Let's say I have the following code in my editor:
>>>       
>>> import sys
>>> x =ys
>>>       
>>> Now, I would like to get all attributes of the object called 'x'. I
>>> can "instrument" the code and add "print dir(x)" at the end,
>>> temporarily redirect the python output to a string and execute the
>>> code.
>>>       
>>> But this is not safe: I do NOT want to execute the code while the user
>>> is typing!
>>>       
>>> Is there a way to "compile" the python code and get access to the
>>> symbol table from that compiled block?
>>>       
>>> Did anybody ever implement AutoComplete in a editor for Python?
>>>       
>>> cheers.
>>>       
>> Several editors for Python support auto-complete, to one extent or
>> another.  The only one I have experience with is Komodo.  Komodo runs in
>> a separate process, so it doesn't suffer from the problems of having two
>> gui event-loops in the same process, and other similar problems.   It
>> also won't be executing code that might have side effects in the child
>> process.
>>
>> The downside is that in order to do auto-complete, it has to figure it
>> out from other clues.  From the docs, and from reading, and from
>> experiementing, I believe that it uses two approaches.  One approach is
>> a set of language files which try to describe all the symbols in the
>> standard language and library.  They have one for each release (2.4,
>> 2.5, ...)  Theoretically, you could add your own for other libraries.  
>> Second approach is to parse the code that's visible to it.  That parsing
>> is well done, and surprisingly quick, but there are lots of tricks a
>> developer might use that can fool it.  For example, wxPython lets you
>> import just one symbol, and lots more appear magically.  It's no big
>> deal, they have code structured one way, but the interface is very
>> different.  Catch is that code completion frequently gets fooled by these.
>>
>> I'd point out that if you do walk the dictionaries at run time, you'll
>> get different results when you do it with nothing running than if you do
>> a strictly static analysis.  So some things might only show up if you've
>> stepped into the function with the magic going on.
>>
>> Simplest example I can come up with of something a static analysis won't
>> spot:   An instance object    obj   may have some number of attributes
>> assigned the the __init__() method.  But it could also have new fields
>> added by anyone with a referent into it.
>>
>> There is a Python parser in module ast.  Perhaps that'd be some help.  
>> I've not used it, so can't give you any specifics.
>>
>> DaveA
>>     
>
>
> I think it might be possible for me to figure out how to do
> AutoCompletion using the symtable object. But I am having difficulty
> making sense of it.
>
> In my tests, I was use the following Python code:
>
> [code]
> import sys
> x=s
> [/code]
>
> The idea is to get the type of the variable x
>
> To attempt this, I use the following C code (my editor is written in
> C)
>
> symtable* st =y_SymtableString ( "import sys
> \nx=s,"<string>",Py_single_input);
>
> PyObject *name, *value;
> Py_ssize_t pos =;
> while (PyDict_Next(st->st_symbols, &pos, &name, &value))
> {
> ...
> }
>
>
>
> Using this code, I can get information like the name of the symbol
> (x), but I can't figure out how to get the type. If I knew how to get
> this it would solve 99% of my problems :)
>
> Any ideas?
>
>   
There's a type() function as a builtin.  It returns a string showing the 
type of any object you pass it.

I have my doubts about the 99%;   I'd say more like 1%.  Objects have to 
be instantiated to have a type, there's no declarations.  And a function 
has a type, but in order to see the result type through introspection, 
you'd have to run it.  And before you could do that, you'd have to guess 
its parameter types.  And hope it didn't have any serious side effects.

I can't help with the C++ code, since I've never written any that use 
the Python runtime, but perhaps you can experiment with a Python 
version, till you see what is and is-not possible.  Look at the 
following in Python:
import sys

dict = sys.__dict__
for sym in dict:
    print "**", sym, type(dict[sym]), str(dict[sym])


Now, for many of these sym values, sym.__dict__  could similarly be 
analyzed.  So you might write a recursive generator that gave you a list 
of symbols.




From davea at ieee.org  Mon May  4 16:42:42 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 04 May 2009 16:42:42 -0400
Subject: IDE for python 2.6 (auto complete)
In-Reply-To: <f6a09c160905040813w6351f11bo41c0198835f7ece5@mail.gmail.com>
References: <f6a09c160905040813w6351f11bo41c0198835f7ece5@mail.gmail.com>
Message-ID: <49FF5342.8060901@ieee.org>

Soumen banerjee wrote:
> Hello,
> I have just installed and run python 2.6.2 from the sources available
> on the website. I notice that SPE (the editor which i used with python
> 2.5) is not displaying some of the functions new in 2.6 as
> autocomplete options. Is there any IDE with support for autocomplete
> in python 2.6 with all the newer functions included?
>
>   
No idea if it's "all", but Komodo 5.1.1 has been updated for 2.6.




From piet at cs.uu.nl  Mon May  4 16:44:55 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Mon, 04 May 2009 22:44:55 +0200
Subject: Threaded alternatives to smtplib?
References: <mailman.5028.1241416479.11746.python-list@python.org>
	<767h7tF1b8q8gU1@mid.uni-berlin.de>
	<mailman.5032.1241421573.11746.python-list@python.org>
Message-ID: <m2eiv4oawo.fsf@cs.uu.nl>

>>>>> Alex Jurkiewicz <alex at bluebottle.net.au> (AJ) wrote:

>AJ> def threadProcessRecipient():
[snip]
>AJ> if __name__ == '__main__':
>AJ>    THREADS = []
>AJ>    for i in range(CONCURRENCY):
>AJ>        THREADS.append(threading.Thread(target=threadProcessRecipient))
>AJ>    for thread in THREADS:
>AJ>        thread.run()

You should use thread.start(), not thread.run(). When you use run(), it
will be sequential execution, as you experience. With start() you get
concurrency
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From davea at ieee.org  Mon May  4 16:47:18 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 04 May 2009 16:47:18 -0400
Subject: How to walk up parent directories?
In-Reply-To: <ZoELl.21595$as4.10585@nlpi069.nbdc.sbc.com>
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>	<87ocu9k6c4.fsf@benfinney.id.au>
	<ZoELl.21595$as4.10585@nlpi069.nbdc.sbc.com>
Message-ID: <49FF5456.9050808@ieee.org>



Matthew Wilson wrote:
> On Sun 03 May 2009 09:24:59 PM EDT, Ben Finney wrote:
>   
>> Not every simple function belongs in the standard library :-)
>>     
>
> Thanks for the help with this!  Maybe I'm overestimating how often
> people need this walkup function.
>
> Matt
>
>   
Look at os.path.normpath(os.path.join( name, ".."))




From norseman at hughes.net  Mon May  4 16:54:26 2009
From: norseman at hughes.net (norseman)
Date: Mon, 04 May 2009 13:54:26 -0700
Subject: change some lines from a read file
In-Reply-To: <49FF4ADB.5020101@bluewin.ch>
References: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
	<49FF4ADB.5020101@bluewin.ch>
Message-ID: <49FF5602.4060702@hughes.net>

Anthra Norell wrote:
> utab wrote:
>> Dear all,
>>
>> I have to change some lines from a template file, which is rather long
>> to paste here, but I would like to make some parts of some lines
>> optional with my command line arguments but I could not see this
>> directly, I can count the line numbers and decide on this basis to
>> decide the lines to be configured to my will.
>>
>> More specifically, say, I have a that file includes
>>
>> this is an example python file to play around
>> .
>> .
>> .
>> some lines
>> .
>> .
>> .
>> . -> an option line for example.
>> .
>> .
>> .
>> -> another option line so on.
>>
>> and execute the script
>> ./myScript option1 option2
>>
>> so that the options at correct locations will be written.
>>
>> Any other options for this simple job that i can improve my Python a
>> bit as well.
>>
>> Best,
>> Umut
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>   
> Your description is not explicit enough to convey your intention. If 
> your template file is too long to post, post a short representative 
> section, an input data sample and a hand-edited sample of the output 
> data you want to generate. You will get more and better advice. .
> 
> Frederic
> 
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 

===================================================

Assuming the total number of changes is not large,

put OPTION1 where you want it to go in the text
put OPTION2  (same)

import sys

if len(sys.argv) >1:
   OPTION1 = sys.argv[1]
else:
   OPTION1 = "some default stuff"

similar for OPTION2
if len(sys.argv) >2:
   like above
and any others

print section1+OPTION1+section2+OPTION2....

                or
           just using the line count  (in place of "print sect..")
line_number= 0
for i in template:
   if line_number matches line number to place Opt1
     print OPTION1
   elif line_number matches v2
     print OPTION2
and so forth
   else:
     print i   (line from template NOT being changed)
   line_number += Line_number

you can group line number and replacement on command line
runprogram (43,"use this instead") (56,....
and parse inside program before opening template

one thing to watch out for:
    for i in file...  often returns just one character at a time, 
meaning you will have to track EOL's yourself  OR
import the readline and use it to stand a better chance of getting what 
you expect from a read file function.


Today: 20090504
Logic outline, No particular version

HTH



From norseman at hughes.net  Mon May  4 16:54:46 2009
From: norseman at hughes.net (norseman)
Date: Mon, 04 May 2009 13:54:46 -0700
Subject: change some lines from a read file
In-Reply-To: <49FF4ADB.5020101@bluewin.ch>
References: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
	<49FF4ADB.5020101@bluewin.ch>
Message-ID: <49FF5616.9070909@hughes.net>

Anthra Norell wrote:
> utab wrote:
>> Dear all,
>>
>> I have to change some lines from a template file, which is rather long
>> to paste here, but I would like to make some parts of some lines
>> optional with my command line arguments but I could not see this
>> directly, I can count the line numbers and decide on this basis to
>> decide the lines to be configured to my will.
>>
>> More specifically, say, I have a that file includes
>>
>> this is an example python file to play around
>> .
>> .
>> .
>> some lines
>> .
>> .
>> .
>> . -> an option line for example.
>> .
>> .
>> .
>> -> another option line so on.
>>
>> and execute the script
>> ./myScript option1 option2
>>
>> so that the options at correct locations will be written.
>>
>> Any other options for this simple job that i can improve my Python a
>> bit as well.
>>
>> Best,
>> Umut
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>   
> Your description is not explicit enough to convey your intention. If 
> your template file is too long to post, post a short representative 
> section, an input data sample and a hand-edited sample of the output 
> data you want to generate. You will get more and better advice. .
> 
> Frederic
> 
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 

===================================================

Assuming the total number of changes is not large,

put OPTION1 where you want it to go in the text
put OPTION2  (same)

import sys

if len(sys.argv) >1:
   OPTION1 = sys.argv[1]
else:
   OPTION1 = "some default stuff"

similar for OPTION2
if len(sys.argv) >2:
   like above
and any others

print section1+OPTION1+section2+OPTION2....

                or
           just using the line count  (in place of "print sect..")
line_number= 0
for i in template:
   if line_number matches line number to place Opt1
     print OPTION1
   elif line_number matches v2
     print OPTION2
and so forth
   else:
     print i   (line from template NOT being changed)
   line_number += Line_number

you can group line number and replacement on command line
runprogram (43,"use this instead") (56,....
and parse inside program before opening template

one thing to watch out for:
    for i in file...  often returns just one character at a time, 
meaning you will have to track EOL's yourself  OR
import the readline and use it to stand a better chance of getting what 
you expect from a read file function.


Today: 20090504
Logic outline, No particular version

HTH

Steve


From clp2 at rebertia.com  Mon May  4 16:58:04 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 4 May 2009 13:58:04 -0700
Subject: Self function
In-Reply-To: <8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
Message-ID: <50697b2c0905041358i5ff7e3c4nf304174631c5f611@mail.gmail.com>

On Mon, May 4, 2009 at 1:25 PM,  <bearophileHUGS at lycos.com> wrote:
> Aahz:
>> When have you ever had a binary tree a thousand levels deep?
>
> Yesterday.
>
>
>>Consider how big 2**1000 is...<
>
> You are thinking just about complete binary trees.
> But consider that a topology like a single linked list (every node has
> 1 child, and they are chained) is a true binary tree still.

And who in their right mind would not use a *self-balancing* binary
tree in that situation?

Cheers,
Chris
-- 
http://blog.rebertia.com


From piet at cs.uu.nl  Mon May  4 17:01:12 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Mon, 04 May 2009 23:01:12 +0200
Subject: Is there is any way to send messages to chunk of emails ID's
	concurrently using smptlib
References: <17ea2ba6-3f5d-4e7e-b05b-6d91dfbc5b36@k19g2000prh.googlegroups.com>
Message-ID: <m27i0woa5j.fsf@cs.uu.nl>

>>>>> gganesh <ganesh.gbg at gmail.com> (g) wrote:

>g> Hi friends,
>g> I suppose sendmail() can send mails one by one ,how to send mails
>g> concurrently ,
>g> It would be very grateful,if someone could point out a solution.

There is a discussion about this in the thread `Threaded alternatives to
smtplib?' 
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From davea at ieee.org  Mon May  4 17:10:11 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 04 May 2009 17:10:11 -0400
Subject: SYSTEM and USER environment (was Your confirmation is required
	to join the Python-list mailing list)
In-Reply-To: <7be934440905040914t699a0e70s62671f299961ac6@mail.gmail.com>
References: <mailman.0.1241452418.13411.python-list@python.org>
	<7be934440905040914t699a0e70s62671f299961ac6@mail.gmail.com>
Message-ID: <49FF59B3.3030300@ieee.org>

Allan Yuan wrote:
> Hi,
> I just wanna know how to set SYSTEM variables and USER variables of windows,
> but got no way.
>
> Firstly I thought "os.environ + os.system" may work well, but found no way
> to let "os.environ" run to retrive USER variables.
>
> Then I tried win32api, finding the GetEnvironmentVariables() mixing SYSTEM
> and USER variables up, and SetEnvironmentVariables() failing to add
> variables.
>
> Could you help me, please?
> Thanks a lot.
>
>   
First, you need to put a meaningful subject line on a query to the 
list.  Hopefully you also did the confirmation, so that you'll actually 
be getting the list emails.

Next, your problem.  SYSTEM and USER variables are a uniquely Windows 
concept, and as far as I know, have no direct counterpart in Python.  
These are really just names used in the Control Panel applet to refer to 
two sections of the registry which are used to define which environment 
variables a task will start with, if the task is started directly from 
Explorer.  Tasks that are started by other tasks (eg. the command line) 
get environment variables as defined by the parent.

So, there are at least three obvious ways a process gets started.  One 
is by explorer, in which case it gets the environment described above.  
Two is by a DOS box, in which case it gets the environment variables 
according to the rules of the CMD shell.  And third is from an arbitrary 
3rd party process, in which case it's up to that developer.

So, which are you trying to change?  I'm suspecting you're interested in 
the Explorer version, for example that launches a program from a 
shortcut on the desktop, or via an association with a particular file 
extension.  i don't know which registry variables are involved, but 
there are two registry keys,
     Try:    hklm/SYSTEm/CurrentControlSet/Control/Session 
Manager/Environment    for the SYSTEM environment variables
               and hkcu/Environment     for the USER environment variables

Experiment first with REGEDIT, then when you get the behavior you want,  
look up module _winreg  (or winreg in Python 3.0) to do it 
programmatically.  Notice that existing DOS boxes won't see these new 
variables, only things launched by Explorer or the equivalent.

It's also possible you just want to set environment variables for a 
particular DOS box session.  In that case, use a .BAT or .CMD file, in 
which a SET statement tells the shell what values to use next time it 
launches.




From arnodel at googlemail.com  Mon May  4 17:31:29 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 04 May 2009 22:31:29 +0100
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
Message-ID: <m2fxfkr1vy.fsf@googlemail.com>

bearophileHUGS at lycos.com writes:

> Aahz:
>> When have you ever had a binary tree a thousand levels deep?
>
> Yesterday.
>
>
>>Consider how big 2**1000 is...<
>
> You are thinking just about complete binary trees.
> But consider that a topology like a single linked list (every node has
> 1 child, and they are chained) is a true binary tree still.

In that case the following would not grow the stack, given tail-call
optimization:

def visit(node):
    print 'visiting', node
    if node.right is None:
        return visit(node.left)
    if node.left is not None:
        visit(node.left)
    return visit(node.right)

-- 
Arnaud


From rhodri at wildebst.demon.co.uk  Mon May  4 17:54:08 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 04 May 2009 22:54:08 +0100
Subject: if statement, with function inside it: if (t = Test()) == True:
In-Reply-To: <slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>
References: <d14b67f4-6b5e-4748-85f6-6d4f69353fa2@w40g2000yqd.googlegroups.com>
	<020183f4$0$20619$c3e8da3@news.astraweb.com>
	<slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>
Message-ID: <op.utfdsicva8ncjz@gnudebst>

On Mon, 04 May 2009 15:25:44 +0100, Antoon Pardon  
<apardon at forel.vub.ac.be> wrote:

> On 2009-04-24, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au>  
> wrote:
>> On Fri, 24 Apr 2009 03:00:26 -0700, GC-Martijn wrote:
>>
>>> Hello,
>>>
>>> I'm trying to do a if statement with a function inside it. I want to  
>>> use
>>> that variable inside that if loop , without defining it.
>>>
>>> def Test():
>>>     return 'Vla'
>>>
>>> I searching something like this:
>>>
>>> if (t = Test()) == 'Vla':
>>>     print t # Vla
>>>
>>> or
>>>
>>> if (t = Test()):
>>>     print t # Vla
>>
>> Fortunately, there is no way of doing that with Python. This is one
>> source of hard-to-debug bugs that Python doesn't have.
>
> I think this is an unfortunate consequence of choosing '=' for the
> assignment. They could have chosen an other token to indicate an
> assignment one that would have made the difference between an
> assignment and a comparison more visually different and thus
> bugs by using one while needing the other less hard to track
> down.

What token could be used and still be meaningful, though?  Algol
used ":=", which has most of the same problems as "=" (more, in my
opinion, since it fools the eye more easily if you're scanning
printed code quickly).  Easily constructed arrows like "<=" or
"<-" collide with different comparators.  About all that's left
that even vaguely implies assignment is "~", and it's no better.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gagsl-py2 at yahoo.com.ar  Mon May  4 17:54:22 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 04 May 2009 18:54:22 -0300
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
	<mailman.5041.1241442097.11746.python-list@python.org>
	<c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com>
	<gtmsf0$se7$1@amma.irisa.fr>
	<b1f47eb5-22a6-491c-b6db-bda94c934b23@l28g2000vba.googlegroups.com>
Message-ID: <op.utfdswb4x6zn5v@gabriel.sleipnir-bsas>

En Mon, 04 May 2009 15:12:41 -0300, mzdude <jsanga at cox.net> escribi?:

> substring isn't limited to 0..255
>>>> substring = "\0x%d\0x%d" % (257,257)
>>>> 'acaccgac'.replace("ac", substring)
> '\x00x257\x00x257\x00x257\x00x257cg\x00x257\x00x257'

This isn't what you think it is. Look carefully:

py> substring = "\0x%d\0x%d" % (257,257)
py> len(substring)
10
py> list(substring)
['\x00', 'x', '2', '5', '7', '\x00', 'x', '2', '5', '7']

-- 
Gabriel Genellina



From tjreedy at udel.edu  Mon May  4 17:54:50 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 04 May 2009 17:54:50 -0400
Subject: Self function
In-Reply-To: <e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
Message-ID: <gtno79$g9h$1@ger.gmane.org>

bearophileHUGS at lycos.com wrote:

> Another possible syntax:
> 
> def fact(n):
>     return 1 if n <= 1 else n * return(n - 1)
> 
> But I guess most people don't see this problem as important&common
> enough to justify changing the language.

Actually, I would like a way to refer to the current function from 
inside a function.  but I would like support in the language, so that 
the compiler patched the code after the function object is created to 
directly refer to the function object (or can the code object call the 
code object?) without any name lookup at all. [An possible objection to 
doing this is that the code might no longer be valid if used to make 
another function object, but I think this is so rare at to hardly worry 
about.] Your initial post seemed to be about a hackish work around that 
looked to me to make as much trouble as it saves.  So I did not respond.



From Robert.T.Lynch at seagate.com  Mon May  4 18:02:13 2009
From: Robert.T.Lynch at seagate.com (Robert.T.Lynch at seagate.com)
Date: Mon, 4 May 2009 15:02:13 -0700
Subject: exit a program gracefully
Message-ID: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>

In a python program I ask if the user wants to continue.  If they answer 
'no', what options do I have to halt execution?  I can put the rest of the 
code inside an "if bContinue:" block, but that seems awkward.  I have 
looked at raising an exception, and perhaps this is the preferred method, 
but it seems daunting to my non-OOP eyes.  Thanks -- Rob
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From tjreedy at udel.edu  Mon May  4 18:02:59 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 04 May 2009 18:02:59 -0400
Subject: find sublist inside list
In-Reply-To: <gtmlsk$q51$1@amma.irisa.fr>
References: <gtmlsk$q51$1@amma.irisa.fr>
Message-ID: <gtnomi$hlu$1@ger.gmane.org>

Matthias Gall? wrote:
> Hi.
> 
> My problem is to replace all occurrences of a sublist with a new element.
> 
> Example:
> Given ['a','c','a','c','c','g','a','c'] I want to replace all 
> occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).
> 
> If I do this with string ('acaccgac') I have the advantage of all the 
> 'find' functions, but perfomance is bad and some extra care must be 
> taken if one element consist of more then one character (case of 11 for 
> example)
> 
> So I really would like to work with lists straightforward, but I could 
> not found anything to search a sublist inside a list.
> Any propositions for a simple solution?

For a mutable homogenous array, consider the array module.
Any algorithm that applies to a sequence of chars can be adjusted to 
other sequences.  For the above case, remember than you can easily 
filter None out of a sequence.  IE, replace 'a','c' with 6, None and 
then filter when done.



From clp2 at rebertia.com  Mon May  4 18:14:53 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 4 May 2009 15:14:53 -0700
Subject: exit a program gracefully
In-Reply-To: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
References: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
Message-ID: <50697b2c0905041514t22ac9436td0dbe51e0f22dcfa@mail.gmail.com>

On Mon, May 4, 2009 at 3:02 PM,  <Robert.T.Lynch at seagate.com> wrote:
>
> In a python program I ask if the user wants to continue. ?If they answer
> 'no', what options do I have to halt execution? ?I can put the rest of the
> code inside an "if bContinue:" block, but that seems awkward. ?I have looked
> at raising an exception, and perhaps this is the preferred method, but it
> seems daunting to my non-OOP eyes. ?Thanks -- Rob

There's the C-like:
from sys import exit
exit(return_code)

Or if you prefer exceptions, the standard way is:
raise SystemExit

Cheers,
Chris
-- 
http://blog.rebertia.com


From google at mrabarnett.plus.com  Mon May  4 18:16:28 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 23:16:28 +0100
Subject: if statement, with function inside it: if (t = Test()) == True:
In-Reply-To: <op.utfdsicva8ncjz@gnudebst>
References: <d14b67f4-6b5e-4748-85f6-6d4f69353fa2@w40g2000yqd.googlegroups.com>	<020183f4$0$20619$c3e8da3@news.astraweb.com>	<slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>
	<op.utfdsicva8ncjz@gnudebst>
Message-ID: <49FF693C.9000506@mrabarnett.plus.com>

Rhodri James wrote:
> On Mon, 04 May 2009 15:25:44 +0100, Antoon Pardon 
> <apardon at forel.vub.ac.be> wrote:
> 
>> On 2009-04-24, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> 
>> wrote:
>>> On Fri, 24 Apr 2009 03:00:26 -0700, GC-Martijn wrote:
>>>
>>>> Hello,
>>>>
>>>> I'm trying to do a if statement with a function inside it. I want to 
>>>> use
>>>> that variable inside that if loop , without defining it.
>>>>
>>>> def Test():
>>>>     return 'Vla'
>>>>
>>>> I searching something like this:
>>>>
>>>> if (t = Test()) == 'Vla':
>>>>     print t # Vla
>>>>
>>>> or
>>>>
>>>> if (t = Test()):
>>>>     print t # Vla
>>>
>>> Fortunately, there is no way of doing that with Python. This is one
>>> source of hard-to-debug bugs that Python doesn't have.
>>
>> I think this is an unfortunate consequence of choosing '=' for the
>> assignment. They could have chosen an other token to indicate an
>> assignment one that would have made the difference between an
>> assignment and a comparison more visually different and thus
>> bugs by using one while needing the other less hard to track
>> down.
> 
> What token could be used and still be meaningful, though?  Algol
> used ":=", which has most of the same problems as "=" (more, in my
> opinion, since it fools the eye more easily if you're scanning
> printed code quickly).  Easily constructed arrows like "<=" or
> "<-" collide with different comparators.  About all that's left
> that even vaguely implies assignment is "~", and it's no better.
> 
If you're not limited to ASCII then there's '?' (U+2190, 'LEFTWARDS
ARROW'). It's a little too late now, though.


From ryan at rfk.id.au  Mon May  4 18:17:38 2009
From: ryan at rfk.id.au (Ryan Kelly)
Date: Tue, 05 May 2009 08:17:38 +1000
Subject: [ANN] regobj - Pythonic object-based access to the Windows
	Registry
In-Reply-To: <49FF2156.6010909@g.nevcal.com>
References: <1241361308.4359.9.camel@mango>  <49FF2156.6010909@g.nevcal.com>
Message-ID: <1241475458.4427.14.camel@mango>


> >   I've just released the results of a nice Sunday's coding, inspired by
> > one too many turns at futzing around with the _winreg module.  The
> > "regobj" module brings a convenient and clean object-based API for
> > accessing the Windows Registry.
>
> Sounds very interesting, Ryan.  Just a couple questions about the 
> dictionary interface.

Thanks for you interest and suggestions, a couple of quick points below.

> I could see how you could map  numbers to DWORD, 2.x str/3.x bytes to 
> binary, and 2.x unicode/3.x str to REG_SZ.  But you don't document such 
> a translation, so it is unclear exactly what you actually do.  This 
> would be somewhat weird in 2.x, though, where str commonly would want to 
> map to String rather than Binary.
> 
> It seems almost necessary to add an explanation of whatever mapping is 
> presently done, to have complete documentation.

I guess I just ran out of steam on the documentation front :-)

Currently it maps integers to DWORD and anything else to REG_SZ.  The
idea of having a distinct Value class is to allow a more nuanced mapping
to be developed, but I haven't got down to the details of that yet - my
current application only requires REG_SZ.

> Thinking more, I wonder if it is possible to create objects of type 
> Value to put in the dictionary to allow specification of multistring and 
> expandablestring Registry types, but then the dictionary name would have 
> to be redundant with the name attribute in the Value object.  Maybe a 
> nameless value type could be invented, with just type and data attributes?

It certainly is, using syntax like:

  HKCU.foo.bar["key"] = Value("%SYSTEMROOT%/mydir",type=REG_EXPAND_SZ)}

Putting a nameless Value() instance in the initialisation dictionary
should also work (but as you note, there's no documentation or tests for
this yet...)


  Cheers,

     Ryan



-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details

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From google at mrabarnett.plus.com  Mon May  4 18:21:06 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 04 May 2009 23:21:06 +0100
Subject: exit a program gracefully
In-Reply-To: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
References: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
Message-ID: <49FF6A52.5070502@mrabarnett.plus.com>

Robert.T.Lynch at seagate.com wrote:
> 
> In a python program I ask if the user wants to continue.  If they answer 
> 'no', what options do I have to halt execution?  I can put the rest of 
> the code inside an "if bContinue:" block, but that seems awkward.  I 
> have looked at raising an exception, and perhaps this is the preferred 
> method, but it seems daunting to my non-OOP eyes.  Thanks -- Rob
> 
What is the overall structure of the program? What happens if the user
wants to continue? If you're in a loop then you can just use 'break' to
leave the loop.


From Scott.Daniels at Acm.Org  Mon May  4 18:21:18 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 04 May 2009 15:21:18 -0700
Subject: AutoComplete in C++ Editor for Python
In-Reply-To: <10fef506-2c39-418c-82e8-5c0c05a19e5c@s31g2000vbp.googlegroups.com>
References: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>
	<mailman.5011.1241378077.11746.python-list@python.org>
	<10fef506-2c39-418c-82e8-5c0c05a19e5c@s31g2000vbp.googlegroups.com>
Message-ID: <AIidnaDg3e-p9GLUnZ2dnUVZ_h6dnZ2d@pdx.net>

flamz3d at gmail.com wrote:
> ... Using this code, I can get information like the name of the symbol
> (x), but I can't figure out how to get the type. If I knew how to get
> this it would solve 99% of my problems :)

If Python were statically typed, you might be correct.
A _value_ in python has a type, not a variable.  so, you can do:
    some_list = []
    for a in None, True, 1, 1.0, 3.1j, 'text', u'text':
        some_list.append(a)
    print some_list
and you will see something like:
[None, True, 1, 1.0, 3.1000000000000001j, 'text', u'text']
That is, a has the type of its current value.
any kind of object can be stored in any variable.

--Scott David Daniels
Scott.Daniels at Acm.Org


From seanm.py at gmail.com  Mon May  4 18:22:56 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Mon, 4 May 2009 15:22:56 -0700 (PDT)
Subject: Most Basic Question Ever - please help
References: <65be3c66-5940-41ab-8a46-da424918b197@z5g2000vba.googlegroups.com>
	<7c328de7-ed20-450c-819f-7689e73f6a6c@g19g2000vbi.googlegroups.com>
Message-ID: <cb1c7778-7965-4ddc-a929-290aac48fec5@t10g2000vbg.googlegroups.com>

On May 3, 12:22?am, CM <cmpyt... at gmail.com> wrote:
> On May 2, 4:36?pm, seanm... at gmail.com wrote:
>
>
>
> > I am going to try posting here again with more detail to see if I can
> > finally get my first program to work.
>
> > I am working on a MacBook Pro with OS X 10.4.11. I opened a new window
> > in IDLE to create a file. The file had only one line of code and was
> > saved as module1.py. I saved it to Macintosh HD. The one line of code
> > in the file is copied below:
>
> > print 'Hello module world!'
>
> > I closed the file and tried to run it in IDLE and Terminal, but I have
> > had no success. I'll paste my commands and the error messages below
> > (for IDLE, then Terminal). Any help would be very much appreciated. I
> > feel like the marathon just started and I've fallen flat on my face.
> > Thanks.
>
> > IDLE 2.6.2>>> python module1.py
>
> > SyntaxError: invalid syntax
>
> > sean-m-computer:~ seanm$ python
> > Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39)
> > [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
> > Type "help", "copyright", "credits" or "license" for more information.>>> python module1.py
>
> > ? File "<stdin>", line 1
> > ? ? python module1.py
> > ? ? ? ? ? ? ? ? ?^
> > SyntaxError: invalid syntax
>
> Sean, also, keep in mind you can use IDLE to run
> your scripts. ?After you have saved a script/program,
> there is an option for Run in the menu, and then under
> that, Run Module. ?The output of the script will be
> sent to IDLE window indicated as the Python shell.
> You can also just test code directly from within
> that shell, though for multi-line programs, it is
> easier within the composing window.
>
> I suggest you sign up for the Python tutor list:http://mail.python.org/mailman/listinfo/tutor
>
> And you can search through their big archive of
> questions and answers here:http://www.nabble.com/Python---tutor-f2981.html
>
> The tutors there are great and super-helpful, and
> will field any level of question but are particularly
> good for absolute beginners.
>
> Here is a tutorial on using IDLE:http://hkn.eecs.berkeley.edu/~dyoo/python/idle_intro/index.html
>
> And here is a very good general programming tutorial online
> book, focusing on Python:http://www.freenetpages.co.uk/hp/alan.gauld/
>
> Good luck!
> Che

Thanks Che! The explaination and links are much appreciated. -Sean


From Scott.Daniels at Acm.Org  Mon May  4 18:31:01 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 04 May 2009 15:31:01 -0700
Subject: Self function
In-Reply-To: <m2fxfkr1vy.fsf@googlemail.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<m2fxfkr1vy.fsf@googlemail.com>
Message-ID: <37idnXafVJvm9mLUnZ2dnUVZ_v-dnZ2d@pdx.net>

Arnaud Delobelle wrote:
> In that case the following would not grow the stack, given tail-call
> optimization:
> 
> def visit(node):
>     print 'visiting', node
>     if node.right is None:
>         return visit(node.left)
>     if node.left is not None:
>         visit(node.left)
>     return visit(node.right)
> 
Or (without TCO):
     def visit(node):
         while node is not None:
             print 'visiting', node
             if node.right is None:
                 node = node.left
             else:
                 if node.left is not None:
                     visit(node.left)
                 node = node.right

Not so hard, really.

--Scott David Daniels
Scott.Daniels at Acm.Org


From gagsl-py2 at yahoo.com.ar  Mon May  4 18:33:51 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 04 May 2009 19:33:51 -0300
Subject: exit a program gracefully
References: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
	<50697b2c0905041514t22ac9436td0dbe51e0f22dcfa@mail.gmail.com>
Message-ID: <op.utffmpr2x6zn5v@gabriel.sleipnir-bsas>

En Mon, 04 May 2009 19:14:53 -0300, Chris Rebert escribi?:
> On Mon, May 4, 2009 at 3:02 PM,  <Robert.T.Lynch at seagate.com> wrote:

>> In a python program I ask if the user wants to continue. ?If they answer
>> 'no', what options do I have to halt execution? ?I can put the rest of  
>> the
>> code inside an "if bContinue:" block, but that seems awkward. ?I have  
>> looked
>> at raising an exception, and perhaps this is the preferred method, but  
>> it
>> seems daunting to my non-OOP eyes. ?Thanks -- Rob
>
> There's the C-like:
> from sys import exit
> exit(return_code)
>
> Or if you prefer exceptions, the standard way is:
> raise SystemExit

I prefer to put the code inside a function, and just `return` earlier.
Having a sys.exit() in the middle of a function means that it's not  
reusable; I usually have a single exit() at the end.


def do_work():
   do some work
   ask the user
   if not continue:
     return 0
   do more work
   return 0

if __name__=='__main__':
   try: sts = do_work()
   except: sts = 1, log exception
   sys.exit(sts)

-- 
Gabriel Genellina



From tjreedy at udel.edu  Mon May  4 18:36:55 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 04 May 2009 18:36:55 -0400
Subject: if statement, with function inside it: if (t = Test()) == True:
In-Reply-To: <slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>
References: <d14b67f4-6b5e-4748-85f6-6d4f69353fa2@w40g2000yqd.googlegroups.com>	<020183f4$0$20619$c3e8da3@news.astraweb.com>
	<slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>
Message-ID: <gtnqm6$ms7$1@ger.gmane.org>

Antoon Pardon wrote:
> On 2009-04-24, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:
>> On Fri, 24 Apr 2009 03:00:26 -0700, GC-Martijn wrote:
>>
>>> Hello,
>>>
>>> I'm trying to do a if statement with a function inside it. I want to use
>>> that variable inside that if loop , without defining it.
>>>
>>> def Test():
>>>     return 'Vla'
>>>
>>> I searching something like this:
>>>
>>> if (t = Test()) == 'Vla':
>>>     print t # Vla
>>>
>>> or
>>>
>>> if (t = Test()):
>>>     print t # Vla
>> Fortunately, there is no way of doing that with Python. 

There is a way to do something close.

def x(v):
     x.val = v
     return v

if x(3)==3:
     print('x.val is ', x.val)
# prints
x.val is  3

In OP's case, condition is "x(Test()) == 'Vla'"

>> This is one  source of hard-to-debug bugs that Python doesn't have.
> 
> I think this is an unfortunate consequence of choosing '=' for the
> assignment.

Actually, is is a consequence of making assignment a statement rather 
than an expression.  And that is because if assignment were an 
expression, the new name would have to be quoted.  Or there would have 
to be a special exception to the normal expression evaulation rule.  In 
other words, the problems one sees in a pure expression language.  Note 
that C, for instance, which has such a special exception, does not, last 
I knew, allow a,b = 1,2.

The solution for this use case is to encapsulate the binding within a 
function.  The above is one possible example.  One could use a pocket 
class instead of a pocket function.  Or

def set_echo(name, val):
   globals()[name] = val
   return val

if set_echo('t', Test()) == 'Vla': print t ...

Terry Jan Reedy




From Scott.Daniels at Acm.Org  Mon May  4 18:49:46 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 04 May 2009 15:49:46 -0700
Subject: if statement, with function inside it: if (t = Test()) == True:
In-Reply-To: <mailman.5076.1241475375.11746.python-list@python.org>
References: <d14b67f4-6b5e-4748-85f6-6d4f69353fa2@w40g2000yqd.googlegroups.com>	<020183f4$0$20619$c3e8da3@news.astraweb.com>	<slrngvtun8.8ol.apardon@rcpc42.vub.ac.be>	<op.utfdsicva8ncjz@gnudebst>
	<mailman.5076.1241475375.11746.python-list@python.org>
Message-ID: <Vr2dnfaTIdhC8mLUnZ2dnUVZ_v6dnZ2d@pdx.net>

MRAB wrote:
> If you're not limited to ASCII then there's '?' (U+2190, 'LEFTWARDS
> ARROW'). It's a little too late now, though.
Well, if you are old enough, that was the ASCII graphic for the
character now printed as '_' (ASCII), and SAIL used it for assignment
statements, causing much consternation when our source code displayed
funny on new-fangled terminals.  So, just an unfortunate setting on
the time machine is the basic flaw.

--Scott David Daniels
@Acm.Org


From pavlovevidence at gmail.com  Mon May  4 18:51:15 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 4 May 2009 15:51:15 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
Message-ID: <a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>

On May 4, 1:25?pm, bearophileH... at lycos.com wrote:
> Aahz:
>
> > When have you ever had a binary tree a thousand levels deep?
>
> Yesterday.
>
> >Consider how big 2**1000 is...<
>
> You are thinking just about complete binary trees.
> But consider that a topology like a single linked list (every node has
> 1 child, and they are chained) is a true binary tree still.

1. Singly-linked lists can and should be handled with iteration.  All
recursion does it make what you're doing a lot less readable for
almost all programmers.

2. You should be using a Python list anyway.


Carl Banks


From ben+python at benfinney.id.au  Mon May  4 18:55:31 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Tue, 05 May 2009 08:55:31 +1000
Subject: IDE for python 2.6 (auto complete)
References: <mailman.5053.1241450027.11746.python-list@python.org>
Message-ID: <87zldsiil8.fsf@benfinney.id.au>

Soumen banerjee <soumen08 at gmail.com> writes:

> Is there any IDE with support for autocomplete in python 2.6 with all
> the newer functions included?

Emacs, with the right library, is an excellent Python IDE with
auto-completion and many other features
<URL:http://tellarite.net/2008/05/09/emacs-as-a-powerful-python-ide/>.

-- 
 \           ?People are very open-minded about new things, as long as |
  `\         they're exactly like the old ones.? ?Charles F. Kettering |
_o__)                                                                  |
Ben Finney


From bearophileHUGS at lycos.com  Mon May  4 19:06:28 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 4 May 2009 16:06:28 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
Message-ID: <f17fd77e-43b9-4d97-ba29-4790def4826d@z7g2000vbh.googlegroups.com>

Carl Banks:

>1. Singly-linked lists can and should be handled with iteration.<

I was talking about a binary tree with list-like topology, of course.


>All recursion does it make what you're doing a lot less readable for almost all programmers.<

I can't agree. If the data structure is recursive (like a tree, or
even sometimes graphs, etc) a recursive algorithm is shorter, more
readable and more natural.

An example, a postorder recursive visit:

def postorder_scan(root):
    if root is not None:
        if root.left is not None:
            for n in postorder_scan(root.left):
                yield n
        if root.right is not None:
            for n in postorder_scan(root.right):
                yield n
        yield root

Try to write that in an iterative way, not adding any new field to the
nodes, and you will see.
And even if you add a "visited" new boolean field to nodes, the
resulting code isn't as nice as the recursive one yet.


> 2. You should be using a Python list anyway.

I should use D when I have to use such algorithms, I know.

Bye,
bearophile


From amber.of.luxor at gmail.com  Mon May  4 19:30:32 2009
From: amber.of.luxor at gmail.com (Amber)
Date: Mon, 4 May 2009 17:30:32 -0600
Subject: Database help needed
Message-ID: <da8216770905041630v2d9dc1a0xdaacd4e1738b1ff9@mail.gmail.com>

My PHB is insane.

Today he drops 50,000 databases in MS Access format on my desk, and tells me
that by Friday I need to:
* Remove all of the "junk content" in the record fields;
* Remove all records with blank fields in them;
* Correct all fields in which the markup is "wrong";
* Correct all fields in which the data is "wrong";
* Ensure that all database include some specific tables;
** Add appropriate content to the records in the "new" tables;

And finally, said databases are to be in:

* MS Access 97 format;
* MS Access 2000 format;
* MS Access 2003 format;
** Is there any documentation anywhere on what the differences between those
is?   Won't a database created for Access 97 be openable in MS Access 2003?
* SQLite format;
* MySQL format;
* PDB format, for use on his PalmPilot;
* Commas separated values;
* dBase 3;
* Excell spreadsheets;
* ODF spreadsheets;

I'm a programming novice, but I think that I can write a script that reads
the MSAccess databases, and cleans up the content in the individual fields
of the database.
What I need is:
* A pointer to good. current, downloadable documentation on creating, and
editing databases using Python;
** Good current books on python and databases will also be useful;
* Pointers to material that describe how to create MS Access databases using
Python, on Linux;
* Pointers to material that describe how to create, and edit SQL CE 2.0
databases in Python, on Linux.  I'm assuming that this is possible, but
since that database engine is available for Windows Mobile only --- at least
according to the Google search I did --- I have some doubts;

I need stuff I can download.   I'll be burning it to a DVD, and taking that
to work.   No internet access at work.  The PHB considers that to be a time
waster, and an expensive luxury that can not be justified in the current
economic climate.

Amber
-- 
Wind under Thy Wings
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From pavlovevidence at gmail.com  Mon May  4 19:33:13 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 4 May 2009 16:33:13 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com> 
	<f17fd77e-43b9-4d97-ba29-4790def4826d@z7g2000vbh.googlegroups.com>
Message-ID: <f6d22d90-b1e1-40f2-8647-834163638ce3@v35g2000pro.googlegroups.com>

On May 4, 4:06?pm, bearophileH... at lycos.com wrote:
> Carl Banks:
>
> >1. Singly-linked lists can and should be handled with iteration.<
>
> I was talking about a binary tree with list-like topology, of course.

"(every node has 1 child, and they are chained)"

That's a singly-linked list, not a tree.  It's a degenerate tree at
best.


> >All recursion does it make what you're doing a lot less readable for almost all programmers.<
>
> I can't agree.

If every child has one node you don't need recursion.


> If the data structure is recursive (like a tree, or
> even sometimes graphs, etc) a recursive algorithm is shorter, more
> readable and more natural.

Because that's a tree, not a linked-list.

Which is germane because Python's recursion limit is the thing you're
complaining about here, and you don't normally hit that limit with
real trees because they rarely go 1000 deep.

Singly-linked lists don't count because you don't need recursion for
them.


[snip strawman example]
> > 2. You should be using a Python list anyway.
>
> I should use D when I have to use such algorithms, I know.

That's another idea.


Carl Banks



From emile at fenx.com  Mon May  4 19:51:10 2009
From: emile at fenx.com (Emile van Sebille)
Date: Mon, 04 May 2009 16:51:10 -0700
Subject: Database help needed
In-Reply-To: <da8216770905041630v2d9dc1a0xdaacd4e1738b1ff9@mail.gmail.com>
References: <da8216770905041630v2d9dc1a0xdaacd4e1738b1ff9@mail.gmail.com>
Message-ID: <gtnuts$v7$1@ger.gmane.org>

On 5/4/2009 4:30 PM Amber said...
> 
> My PHB is insane.
> 
> Today he drops 50,000 databases in MS Access format on my desk, and 
> tells me that by Friday I need to:
> * Remove all of the "junk content" in the record fields;
> * Remove all records with blank fields in them;
> * Correct all fields in which the markup is "wrong";
> * Correct all fields in which the data is "wrong";
> * Ensure that all database include some specific tables;
> ** Add appropriate content to the records in the "new" tables;
> 
> And finally, said databases are to be in:
> 
> * MS Access 97 format;
> * MS Access 2000 format;
> * MS Access 2003 format;
> ** Is there any documentation anywhere on what the differences between 
> those is?   Won't a database created for Access 97 be openable in MS 
> Access 2003?
> * SQLite format;
> * MySQL format;
> * PDB format, for use on his PalmPilot;
> * Commas separated values;
> * dBase 3;
> * Excell spreadsheets;
> * ODF spreadsheets;


It wouldn't surprise me that you couldn't do all this with open office 
using command line options which is where I'd start.  There's also 
python modules available, but I haven't yet gotten into them.  I found 
most of what I needed on groups.google.com though, so not having 
internet access could be trouble -- some of the conversion structures 
and requirements weren't quite so obvious nor documentation easily 
available.

Emile



From debatem1 at gmail.com  Mon May  4 19:53:05 2009
From: debatem1 at gmail.com (CTO)
Date: Mon, 4 May 2009 16:53:05 -0700 (PDT)
Subject: Database help needed
References: <da8216770905041630v2d9dc1a0xdaacd4e1738b1ff9@mail.gmail.com> 
	<mailman.5082.1241480972.11746.python-list@python.org>
Message-ID: <a9ddf183-cc96-4121-8e8a-718331627d2b@s21g2000vbb.googlegroups.com>

On May 4, 7:51?pm, Emile van Sebille <em... at fenx.com> wrote:
> On 5/4/2009 4:30 PM Amber said...
>
>
>
>
>
> > My PHB is insane.
>
> > Today he drops 50,000 databases in MS Access format on my desk, and
> > tells me that by Friday I need to:
> > * Remove all of the "junk content" in the record fields;
> > * Remove all records with blank fields in them;
> > * Correct all fields in which the markup is "wrong";
> > * Correct all fields in which the data is "wrong";
> > * Ensure that all database include some specific tables;
> > ** Add appropriate content to the records in the "new" tables;
>
> > And finally, said databases are to be in:
>
> > * MS Access 97 format;
> > * MS Access 2000 format;
> > * MS Access 2003 format;
> > ** Is there any documentation anywhere on what the differences between
> > those is? ? Won't a database created for Access 97 be openable in MS
> > Access 2003?
> > * SQLite format;
> > * MySQL format;
> > * PDB format, for use on his PalmPilot;
> > * Commas separated values;
> > * dBase 3;
> > * Excell spreadsheets;
> > * ODF spreadsheets;
>
> It wouldn't surprise me that you couldn't do all this with open office
> using command line options which is where I'd start. ?There's also
> python modules available, but I haven't yet gotten into them. ?I found
> most of what I needed on groups.google.com though, so not having
> internet access could be trouble -- some of the conversion structures
> and requirements weren't quite so obvious nor documentation easily
> available.
>
> Emile

I was just about to recommend OO. PyUNO is pretty easy to use, IMHO,
and while I obviously have no idea what your boss wants in specific,
it shouldn't be too bad.

Geremy Condra


From gallium.arsenide at gmail.com  Mon May  4 19:59:15 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Mon, 4 May 2009 16:59:15 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com>
Message-ID: <1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com>

On May 4, 10:01?am, Ross <ross.j... at gmail.com> wrote:
> The "magic numbers" that everyone is wondering about are
> indeed used for spreading out the bye selection and I got
> them by simply calculating a line of best fit when plotting
> several courts: byes ratios.

But that doesn't really help you.  When you do seq[::step], step is
evaluated once and used for the whole extended slice.  So in almost
all cases that you are likely to encounter, step is 2, so you'll get
seq[0], seq[2], seq[4], etc.  Even if step is some other positive
number, seq[0] will always be chosen.

> The "byes = #whatever" in my code calculate the number of
> tuples that need to be placed in the bye_list.

Fine, but that's not the number of byes that you put into bye_list.

> At first glance, the suggestion of adding a simple shift
> at the end of round_robin doesn't seem to work since
> round_robin already shifts everything except for the first
> position already. Please correct me if I'm wrong because
> you might have been suggesting something different.

If you read my post carefully, you would see that you HAVE to do
something about the first player always being stuck in the first
spot.  Either move him around, or select your byes differently.

That said, I've played around with the shuffling a bit, and it does
seem to be pretty tricky to get it to work for the general case where
there is no prior knowledge of how many players and courts you will
have.

I can't shake the feeling that someone good at math will be able to
figure out something elegant; but if left to my own devices, I am
starting to lean toward just generating all the possible matches and
somehow picking from them as needed to fill the courts, trying to keep
the number of matches played by each player as close to equal as
possible, and trying to keep the waiting times approximately equal as
well.

John


From norseman at hughes.net  Mon May  4 20:15:55 2009
From: norseman at hughes.net (norseman)
Date: Mon, 04 May 2009 17:15:55 -0700
Subject: Tkinter, Trouble with Message,Label widget
In-Reply-To: <4f61c431-1c78-4de7-9b82-08eee09ae7d6@s20g2000vbp.googlegroups.com>
References: <mailman.5017.1241392410.11746.python-list@python.org>
	<4f61c431-1c78-4de7-9b82-08eee09ae7d6@s20g2000vbp.googlegroups.com>
Message-ID: <49FF853B.7040404@hughes.net>

Ioannis Lalopoulos wrote:
> I assume that you create the two windows through two different calls
> to Tkinter.Tk() but you cannot enter two mainloops (at least not in a
> normal way).
> 
> If you want a second window use the Toplevel widget.
> 
> Try the following, it does what you want:
> 
> import Tkinter
> 
> root = Tkinter.Tk()
> 
> my_text = Tkinter.StringVar(root)
> 
> another_window = Tkinter.Toplevel()
> 
> entry = Tkinter.Entry(root, textvar=my_text)
> entry.pack()
> 
> label = Tkinter.Label(another_window, textvar=my_text)
> label.pack()
> 
> root.mainloop()
> 
> In the above example, whatever you type in the entry widget in the
> root window gets reflected in the label widget which is inside the
> second window, the one that was created with Tkinter.Toplevel().
> 
> Hope it helps,
> 
> John
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
================================================
Hendrik van Rooyen  mentioned the textvar too.  Thanks Hendrik

John (Ioannis);
         It took me awhile to get your template to work for me.
         People reading this!  THE ABOVE CODE WORKS JUST FINE - AS IS!!!

My needs are slightly different and it took me a bit to get python and I 
on the same track.  I still have reflexes that demand dictionary 
compliance.  Global is supposed to be Global, really, not just sort of.

Once I get past the children I seem to do OK in python.

like:
mVar= '1234'            according to docs, this is a global
p='%6s\n' % mVar        same
...some code to do something
mVar= '4321'            updates a supposed global

                               these two don't think so
print p                 prints from both of these show the 1234,
print '%s' % p[:]       they do not reflect the updated 'global'


 >>>
 >>> mVar= '1234'
 >>> mVar
'1234'
 >>> p= '%s\n' % mVar
 >>> p
'1234\n'
 >>>
 >>> mVar= '4321'
 >>> mVar
'4321'
 >>> print p
1234
 >>> print '%s' % p[:]
1234
 >>>


The definitive on Toplevel was the biggest help. All I have read have 
never clearly stated its purpose. (A non-root root)

per Tkinter help:
"class Toplevel(BaseWidget, Wm)
      Toplevel widget, e.g. for dialogs.
  ...
"
Since I'm not doing dialogs, I quite reading and move on.




John: Thank you again.

Today: 20090504
copy/paste from Python 2.5.2 on Linux Slackware 10.2

Steve
norseman at hughes.net


From aydavis at purdue.edu  Mon May  4 20:45:25 2009
From: aydavis at purdue.edu (Davis, Amelie Y)
Date: Mon, 4 May 2009 20:45:25 -0400
Subject: sorting items in a table problematic because of scientific
	notation
In-Reply-To: <1ff35eef-23bf-4e0a-94e2-73cd3c4e7ba8@y6g2000prf.googlegroups.com>
References: <47B887AC6641DD4DA8949367606399390207BB12@EXCH06.purdue.lcl>
	<mailman.4733.1240965435.11746.python-list@python.org>
	<1ff35eef-23bf-4e0a-94e2-73cd3c4e7ba8@y6g2000prf.googlegroups.com>
Message-ID: <47B887AC6641DD4DA8949367606399390207BF1F@EXCH06.purdue.lcl>

Thank you  _ that solved it. 

?
Am?lie
?
??Please consider the environment before printing this e-mail or any of its attachments (if applicable)
?


-----Original Message-----
From: python-list-bounces+aydavis=purdue.edu at python.org [mailto:python-list-bounces+aydavis=purdue.edu at python.org] On Behalf Of Raymond Hettinger
Sent: Wednesday, April 29, 2009 10:31 AM
To: python-list at python.org
Subject: Re: sorting items in a table problematic because of scientific notation

[John Machin]
> > 'NEAR_DIST'], [('N', 9, 0), ('N', 9, 0), ('F', 19, 11)], [53, 55, '
>
> The data type code for the offending column is "F" which is not in the
> bog-standard dBase III set of C, N, D, and L. The code that you have used merely
> returns unchanged the character string that finds in the data base.
>
>
>
> > 1.05646365517e+005'], [53, 6, ' 9.32599134016e+004'], [53, 0, '
> > 8.97477154418e+004'], [53, 2, ' 8.96449127749e+004'], [53, 1, '
> > 7.88170078501e+004'], [53, 5, ' 8.29281503631e+004'], [53, 4, '

FWIW, I just updated the recipe to handle an F typecode
by casting it to a float.  Hope this helps.


Raymond
--
http://mail.python.org/mailman/listinfo/python-list

From ross.jett at gmail.com  Mon May  4 20:56:57 2009
From: ross.jett at gmail.com (Ross)
Date: Mon, 4 May 2009 17:56:57 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com>
Message-ID: <1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com>

On May 4, 7:59?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 4, 10:01?am, Ross <ross.j... at gmail.com> wrote:
>
> > The "magic numbers" that everyone is wondering about are
> > indeed used for spreading out the bye selection and I got
> > them by simply calculating a line of best fit when plotting
> > several courts: byes ratios.
>
> But that doesn't really help you. ?When you do seq[::step], step is
> evaluated once and used for the whole extended slice. ?So in almost
> all cases that you are likely to encounter, step is 2, so you'll get
> seq[0], seq[2], seq[4], etc. ?Even if step is some other positive
> number, seq[0] will always be chosen.
>
> > The "byes = #whatever" in my code calculate the number of
> > tuples that need to be placed in the bye_list.
>
> Fine, but that's not the number of byes that you put into bye_list.
>
> > At first glance, the suggestion of adding a simple shift
> > at the end of round_robin doesn't seem to work since
> > round_robin already shifts everything except for the first
> > position already. Please correct me if I'm wrong because
> > you might have been suggesting something different.
>
> If you read my post carefully, you would see that you HAVE to do
> something about the first player always being stuck in the first
> spot. ?Either move him around, or select your byes differently.
>
> That said, I've played around with the shuffling a bit, and it does
> seem to be pretty tricky to get it to work for the general case where
> there is no prior knowledge of how many players and courts you will
> have.
>
> I can't shake the feeling that someone good at math will be able to
> figure out something elegant; but if left to my own devices, I am
> starting to lean toward just generating all the possible matches and
> somehow picking from them as needed to fill the courts, trying to keep
> the number of matches played by each player as close to equal as
> possible, and trying to keep the waiting times approximately equal as
> well.
>
> John

"But that doesn't really help you.  When you do seq[::step], step is
evaluated once and used for the whole extended slice.  So in almost
all cases that you are likely to encounter, step is 2, so you'll get
seq[0], seq[2], seq[4], etc.  Even if step is some other positive
number, seq[0] will always be chosen."

It's not true that in almost all cases the step is 2. How that is
evaluated directly depends on the number of available courts. Anyways,
you're right that seq[0] is always evaluated. That's why my algorithm
works fine when there are odd numbers of players in a league. But if
you will notice, my original question was how I could ADD TO or AMMEND
my current code to account for even number of players. I have used an
algorithm that comes up with all possible pairings and then randomly
puts people together each week and places players in a bye list
according to how many times they've previously been in the bye list
but since I was dealing with random permutations, the algorithm took
minutes to evaluate when there were more than 10 players in the
league.


From rcdailey at gmail.com  Mon May  4 22:25:42 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Mon, 4 May 2009 19:25:42 -0700 (PDT)
Subject: subprocess & shared environments
References: <8c79f749-e648-4a2e-afad-4053a8ec5cbd@f41g2000pra.googlegroups.com>
	<98aa4906-5006-437a-8fc0-0eaedf433be9@3g2000yqk.googlegroups.com>
Message-ID: <f361a85c-65a3-4678-9122-5a12e031cd1b@p4g2000vba.googlegroups.com>

On May 1, 4:18?pm, Aaron Brady <castiro... at gmail.com> wrote:
> On May 1, 12:09?am, Robert Dailey <rcdai... at gmail.com> wrote:
>
> > I'm currently calling subprocess.call() on a batch file (in Windows)
> > that sets a few environment variables that are needed by further
> > processes started via subprocess.call(). How can I persist the
> > environment modifications by the first call() function? I've done my
> > own searching on this and I came up with nothing.
>
> > Help is appreciated.
>
> I don't know if this will work, but you can try spawning a batch file
> that calls the first program to set the variables, then executes the
> second program. ?You might need to create that batch file by hand, as
> well as the command line for the second process.
>
> You can also try setting the env. variables in the parent process, and
> restoring them after.

Thanks for your help guys. Unfortunately both ideas will not work. I
guess I should have mentioned that the batch file in question is
vsvars32.bat, from the Visual Studio installation directory. I should
not modify this file, nor can I create a "wrapper" batch file as you
suggested, since I call several other batch files at different times.
There's about 6 other nmake calls I make that each is preceeded with a
call to vsvars32.bat. For now I'm using the && DOS operator, this
seems to work, however it is not ideal.


From soumen08 at gmail.com  Mon May  4 22:30:13 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Tue, 5 May 2009 08:00:13 +0530
Subject: local module-docs server on Linux?
Message-ID: <f6a09c160905041930s643646f6s8d4cdd928200b2ac@mail.gmail.com>

Hello,
I had used python on windows and one of the features i liked best was
that you could start a module-docs server and then use firefox to
access it. This would show module-docs for all modules you had
installed(including any 3rd party installs) . How do i do this on
linux?
regards
Soumen


From gallium.arsenide at gmail.com  Mon May  4 22:33:29 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Mon, 4 May 2009 19:33:29 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com>
Message-ID: <8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com>

On May 4, 8:56?pm, Ross <ross.j... at gmail.com> wrote:

> Anyways, you're right that seq[0] is always evaluated.
> That's why my algorithm works fine when there are odd
> numbers of players in a league.

It doesn't work fine for all odd numbers of players.  For example, 15
players on 3 courts should result in 5 byes.  But what actually
happens with your code is that you get 4 byes or 8 byes, depending on
whether you've got floating-point division enabled.

So the way you are selecting byes does not even guarantee that you'll
allocate the correct number of active matches for the number of
courts, and this is due to the fact that the extended slice is too
"coarse" a tool for the task.  Now, it may be that for you, the number
of players and courts is always within a confined range such that
extended slicing and your magic constants will work.  That's fine for
you, but we weren't given that information.

I haven't even begun to look at what happens for doubles.

John


From david.lyon at preisshare.net  Mon May  4 22:52:38 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Mon, 04 May 2009 22:52:38 -0400
Subject: local module-docs server on =?UTF-8?Q?Linux=3F?=
In-Reply-To: <f6a09c160905041930s643646f6s8d4cdd928200b2ac@mail.gmail.com>
References: <f6a09c160905041930s643646f6s8d4cdd928200b2ac@mail.gmail.com>
Message-ID: <153af629ebccc7f8a28813ae89d2acc4@preisshare.net>

Hi Soumen,

You could try running the Python Package Manager that we are developing
on sourceforge.

There isn't a release yet but we have implemented two buttons inside
the program for 'Examples' and 'Documentation'.

What they do is go off and find any documentation files or example
directories for third party modules that are installed on the system.

Then, if found, they will open a web browser on any documentation
or examples directories.

In the spirit of open source you could give it a try....

svn co https://pythonpkgmgr.svn.sourceforge.net/svnroot/pythonpkgmgr
pythonpkgmgr

Any feedback is welcome..

David

On Tue, 5 May 2009 08:00:13 +0530, Soumen banerjee <soumen08 at gmail.com>
wrote:
> Hello,
> I had used python on windows and one of the features i liked best was
> that you could start a module-docs server and then use firefox to
> access it. This would show module-docs for all modules you had
> installed(including any 3rd party installs) . How do i do this on
> linux?
> regards
> Soumen
> --
> http://mail.python.org/mailman/listinfo/python-list



From ross.jett at gmail.com  Mon May  4 23:01:34 2009
From: ross.jett at gmail.com (Ross)
Date: Mon, 4 May 2009 20:01:34 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com>
Message-ID: <54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com>

On May 4, 7:33?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 4, 8:56?pm, Ross <ross.j... at gmail.com> wrote:
>
> > Anyways, you're right that seq[0] is always evaluated.
> > That's why my algorithm works fine when there are odd
> > numbers of players in a league.
>
> It doesn't work fine for all odd numbers of players. ?For example, 15
> players on 3 courts should result in 5 byes. ?But what actually
> happens with your code is that you get 4 byes or 8 byes, depending on
> whether you've got floating-point division enabled.
>
> So the way you are selecting byes does not even guarantee that you'll
> allocate the correct number of active matches for the number of
> courts, and this is due to the fact that the extended slice is too
> "coarse" a tool for the task. ?Now, it may be that for you, the number
> of players and courts is always within a confined range such that
> extended slicing and your magic constants will work. ?That's fine for
> you, but we weren't given that information.
>
> I haven't even begun to look at what happens for doubles.
>
> John

You're right... I only tested cases when number of people playing
outnumbered the number of byes that week. Anyways, I'm new to
programming and this has been a good learning experience. Next time
around, I'll be sure to thoroughly comment my code before I ask for
help on it. I really appreciate all the help that you've offered so
far. Right now, I'm debating whether I should try to reinvent the
round_robin generator part of the code or whether there still might be
a way to shuffle the results of the generated output so that I can
slice it effectively.


From steven at REMOVE.THIS.cybersource.com.au  Mon May  4 23:22:34 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 03:22:34 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
Message-ID: <pan.2009.05.05.03.22.33@REMOVE.THIS.cybersource.com.au>

On Mon, 04 May 2009 15:51:15 -0700, Carl Banks wrote:

> All
> recursion does it make what you're doing a lot less readable for almost
> all programmers.

What nonsense. There are many algorithms that are more understandable 
written recursively than iteratively -- consult any good text book for 
examples. There are algorithms that are naturally iterative, and 
algorithms which are naturally recursive (and a few which are equally 
simple either way), and forcing either one into the other form leads to 
complicated and confusing code. This especially holds for mutually-
recursive functions, where re-writing them to be iterative is usually 
very difficult.

Sometimes it's worth rewriting a recursive algorithm to be iterative for 
the performance optimization, but that comes at the price of reduced 
readability.



-- 
Steven



From damienlmoore at gmail.com  Mon May  4 23:24:40 2009
From: damienlmoore at gmail.com (dmoore)
Date: Mon, 4 May 2009 20:24:40 -0700 (PDT)
Subject: Problem with case insensitive volumes
Message-ID: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>

Does anyone know of a way to get the unique pathname for files stored
on FAT32 or other case insensitive drives?

For example:

os.path.samefile('/media/usbkey/file1.jpg','/media/usbkey/FILE1.jpg')

returns True

but, is there a simple way to determine whether '/media/usbkey/
file1.jpg' or '/media/usbkey/FILE1.jpg' is the actual representation
on the device.

it matters because operations like this have meaning:

os.rename('/media/usbkey/file1.jpg','/media/usbkey/tmp')
os.rename('/media/usbkey/tmp','/media/usbkey/FILE1.jpg')

If I have a program that scans a directory for files and compares
against a stored list of pathnames, I want to be able to determine not
only that the file still exists but whether or not it has changed case
(i.e. '/media/usbkey/file1.jpg' has become '/media/usbkey/FILE1.jpg').

Any takers?


From steven at REMOVE.THIS.cybersource.com.au  Mon May  4 23:26:15 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 03:26:15 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
	<f17fd77e-43b9-4d97-ba29-4790def4826d@z7g2000vbh.googlegroups.com>
	<f6d22d90-b1e1-40f2-8647-834163638ce3@v35g2000pro.googlegroups.com>
Message-ID: <pan.2009.05.05.03.26.14@REMOVE.THIS.cybersource.com.au>

On Mon, 04 May 2009 16:33:13 -0700, Carl Banks wrote:

> On May 4, 4:06?pm, bearophileH... at lycos.com wrote:
>> Carl Banks:
>>
>> >1. Singly-linked lists can and should be handled with iteration.<
>>
>> I was talking about a binary tree with list-like topology, of course.
> 
> "(every node has 1 child, and they are chained)"
> 
> That's a singly-linked list, not a tree.  It's a degenerate tree at
> best.

A singly-linked list is a degenerate tree. Not "at best", but "is".


>> >All recursion does it make what you're doing a lot less readable for
>> >almost all programmers.<
>>
>> I can't agree.
> 
> If every child has one node you don't need recursion.

And if one single node in the entire tree has two children, you do. What 
are you suggesting, that Bearophile should write his tree-processing code 
to only deal with the degenerate case?



>> If the data structure is recursive (like a tree, or even sometimes
>> graphs, etc) a recursive algorithm is shorter, more readable and more
>> natural.
> 
> Because that's a tree, not a linked-list.

And a linked list is a degenerate tree. If you have a non-self-balancing 
tree, sometimes it will be degenerate, and your code needs to deal with 
it.


> Which is germane because Python's recursion limit is the thing you're
> complaining about here, and you don't normally hit that limit with real
> trees because they rarely go 1000 deep.

And if just ONE branch of the tree goes 1000 deep, even if the rest of 
the tree is shallow, then you hit the default recursion limit.


> Singly-linked lists don't count because you don't need recursion for
> them.

If each node has two (or more) child fields, even if only one of those 
children is non-empty, then your data structure is a degenerate tree and 
does count.



> [snip strawman example]

It's not a strawman just because you don't like it. Dealing with 
degenerate trees is a genuine issue, and avoiding degenerate trees is the 
reason why people have developed more complicated structures like red-
black trees.



-- 
Steven


From alex at bluebottle.net.au  Tue May  5 00:12:56 2009
From: alex at bluebottle.net.au (Alex Jurkiewicz)
Date: Tue, 05 May 2009 12:12:56 +0800
Subject: Threaded alternatives to smtplib?
In-Reply-To: <m2eiv4oawo.fsf@cs.uu.nl>
References: <mailman.5028.1241416479.11746.python-list@python.org>	<767h7tF1b8q8gU1@mid.uni-berlin.de>	<mailman.5032.1241421573.11746.python-list@python.org>
	<m2eiv4oawo.fsf@cs.uu.nl>
Message-ID: <49FFBCC8.8080905@bluebottle.net.au>

Piet van Oostrum wrote:
>> AJ> if __name__ == '__main__':
>> AJ>    THREADS = []
>> AJ>    for i in range(CONCURRENCY):
>> AJ>        THREADS.append(threading.Thread(target=threadProcessRecipient))
>> AJ>    for thread in THREADS:
>> AJ>        thread.run()
>>     
>
> You should use thread.start(), not thread.run(). When you use run(), it
> will be sequential execution, as you experience. With start() you get
> concurrency
>   

Thanks! Changing this method call fixes the original problem we saw. In 
the process I've run into another though, seemingly a race condition / 
deadlock.

Our email script DKIM signs all messages with pydkim. Because this is so 
CPU intensive we run the signing in an external process, using 
dkimsign.py (which basically accepts the message on stdin, calls 
dkim.sign() on it and passes the result back on stdout). We call the 
DKIM signing while preparing each message in each thread like this:
cmd = subprocess.Popen(
    ['/usr/bin/nice', PYTHONBIN, 'dkimsign.py',
    DKIMSELECTOR,
    DKIMDOMAIN,
    DKIMPRIVATEKEYFILE],
    stdin = subprocess.PIPE,
    stdout = subprocess.PIPE)
message = cmd.communicate(message)[0]

The majority of the time (80%) our mail merge works fine -- messages are 
sent out in a multi-threaded manner. The rest of the time, some of the 
threads deadlock when calling dkimsign.py. Specifically, they stop 
during the communicate() call above. dkimsign.py never receives any 
input (hangs on message=sys.stdin.read()), and sits there waiting 
forever, which stops the thread from doing anything.

Is this a bug with subprocess? Is there some way to set a timeout on the 
communicate() call so I can detect these locks?

Cheers,
AJ
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From davea at ieee.org  Tue May  5 00:33:22 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 05 May 2009 00:33:22 -0400
Subject: Problem with case insensitive volumes
In-Reply-To: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
References: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
Message-ID: <49FFC192.40704@ieee.org>

dmoore wrote:
> Does anyone know of a way to get the unique pathname for files stored
> on FAT32 or other case insensitive drives?
>
> For example:
>
> os.path.samefile('/media/usbkey/file1.jpg','/media/usbkey/FILE1.jpg')
>
> returns True
>
> but, is there a simple way to determine whether '/media/usbkey/
> file1.jpg' or '/media/usbkey/FILE1.jpg' is the actual representation
> on the device.
>
> it matters because operations like this have meaning:
>
> os.rename('/media/usbkey/file1.jpg','/media/usbkey/tmp')
> os.rename('/media/usbkey/tmp','/media/usbkey/FILE1.jpg')
>
> If I have a program that scans a directory for files and compares
> against a stored list of pathnames, I want to be able to determine not
> only that the file still exists but whether or not it has changed case
> (i.e. '/media/usbkey/file1.jpg' has become '/media/usbkey/FILE1.jpg').
>
> Any takers?
>
>   
os;walk will tell you the correct case for each node.   So if it gives 
you a different case than the stored form, you have your answer.




From debatem1 at gmail.com  Tue May  5 00:45:44 2009
From: debatem1 at gmail.com (CTO)
Date: Mon, 4 May 2009 21:45:44 -0700 (PDT)
Subject: local module-docs server on Linux?
References: <mailman.5085.1241490619.11746.python-list@python.org>
Message-ID: <3792323b-c44c-47d0-ad90-21df767a4623@o20g2000vbh.googlegroups.com>

On May 4, 10:30?pm, Soumen banerjee <soume... at gmail.com> wrote:
> Hello,
> I had used python on windows and one of the features i liked best was
> that you could start a module-docs server and then use firefox to
> access it.

pydoc -p <port number>


From ur.liam at iksmlapan.reverse  Tue May  5 00:59:18 2009
From: ur.liam at iksmlapan.reverse (Napalmski)
Date: Tue, 5 May 2009 05:59:18 +0100
Subject: Question of UTF16BE encoding / decoding
Message-ID: <MPG.2469d7edf8bbcd0a989683@eu.news.astraweb.com>

Hello,

I have an encoded string in the form "004e006100700061006c006d", if you 
split on every 4 characters it decodes to a single character.
I have come up with this:

name = '004e006100700061006c006d'
name2 = ""
for x in range(0, len(name), 4):
    name2 = name2 + chr(int(name[x:x+4], 16))

Is there a better way to do this using name.decode() that would then 
also work with .encode()?

I have tried .decode("utf-16-be"), which I beleive is the format here, 
but I am getting the error:
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-
11: ordinal not in range(128)

And my debugger seems to show a load of unicode when it breaks.

Thank you!


From gallium.arsenide at gmail.com  Tue May  5 01:12:03 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Mon, 4 May 2009 22:12:03 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com>
Message-ID: <fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com>

On May 4, 11:01 pm, Ross <ross.j... at gmail.com> wrote:
> Anyways, I'm new to
> programming and this has been a good learning experience.

I'm glad that you've been trying, and seem to be sticking it out
despite sometimes getting negative feedback here.

> Next time around, I'll be sure to thoroughly comment
> my code before I ask for help on it.

The best documentation, especially for a language like Python, is
simply logical variable names and sensible conventions.  I bring this
up because I'm wary of the word "thoroughly".  When you're dealing
with experts, it's actually best to use inline comments sparingly;
they can figure out what code does.  The overall problem description
at the top is important, as well as explanation of "magic numbers" and
such.

> I really appreciate all the help that you've offered so far.

You're welcome.  I'm not sure how much I've helped, especially as I'm
frankly not one of the stronger programmers here.

> Right now, I'm debating whether I should try to reinvent
> the round_robin generator part of the code or whether
> there still might be a way to shuffle the results of the
> generated output so that I can slice it effectively.

If you are going to typically have roughly enough courts for your
players (as implied by your test data), then maybe there's still a
chance for using extended slicing.  Just make sure you don't always
pick the first element.  If the number of players and the number of
courts can vary wildly, and won't always match up at least sort of
nicely, then the problem may require bigger guns (either much better
math or much more sophisticated programming).

John


From metolone+gmane at gmail.com  Tue May  5 01:21:29 2009
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Mon, 4 May 2009 22:21:29 -0700
Subject: Question of UTF16BE encoding / decoding
References: <MPG.2469d7edf8bbcd0a989683@eu.news.astraweb.com>
Message-ID: <gtoicj$531$1@ger.gmane.org>


"Napalmski" <ur.liam at iksmlapan.reverse> wrote in message 
news:MPG.2469d7edf8bbcd0a989683 at eu.news.astraweb.com...
> Hello,
>
> I have an encoded string in the form "004e006100700061006c006d", if you
> split on every 4 characters it decodes to a single character.
> I have come up with this:
>
> name = '004e006100700061006c006d'
> name2 = ""
> for x in range(0, len(name), 4):
>    name2 = name2 + chr(int(name[x:x+4], 16))
>
> Is there a better way to do this using name.decode() that would then
> also work with .encode()?
>
> I have tried .decode("utf-16-be"), which I beleive is the format here,
> but I am getting the error:
> UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-
> 11: ordinal not in range(128)
>
> And my debugger seems to show a load of unicode when it breaks.

import binascii
s = '004e006100700061006c006d'
h = binascii.unhexlify(s)
print h.decode('utf-16-be')

-Mark




From gagsl-py2 at yahoo.com.ar  Tue May  5 01:47:31 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 05 May 2009 02:47:31 -0300
Subject: subprocess & shared environments
References: <8c79f749-e648-4a2e-afad-4053a8ec5cbd@f41g2000pra.googlegroups.com>
	<98aa4906-5006-437a-8fc0-0eaedf433be9@3g2000yqk.googlegroups.com>
	<f361a85c-65a3-4678-9122-5a12e031cd1b@p4g2000vba.googlegroups.com>
Message-ID: <op.utfzphtsx6zn5v@lepton.softlabbsas.com.ar>

En Mon, 04 May 2009 23:25:42 -0300, Robert Dailey <rcdailey at gmail.com>  
escribi?:

> Thanks for your help guys. Unfortunately both ideas will not work. I
> guess I should have mentioned that the batch file in question is
> vsvars32.bat, from the Visual Studio installation directory. I should
> not modify this file, nor can I create a "wrapper" batch file as you
> suggested, since I call several other batch files at different times.
> There's about 6 other nmake calls I make that each is preceeded with a
> call to vsvars32.bat. For now I'm using the && DOS operator, this
> seems to work, however it is not ideal.

There is nothing special about vsvars32.bat. If you execute it before your  
first program (maybe inside a .cmd that calls vsvars32 and then your  
program) then all the spawned programs will already see those settings. No  
need to invoke it over and over.
Also, if you enter the same settings in the registry (so they become  
persistent) you don't have to worry again.

-- 
Gabriel Genellina



From joelriv at gmail.com  Tue May  5 02:00:05 2009
From: joelriv at gmail.com (Joel Juvenal Rivera Rivera)
Date: Tue, 05 May 2009 01:00:05 -0500
Subject: Any idea to emulate tail -f
Message-ID: <1241503205.5374.25.camel@keblar.lapjoe>

I want to make something very similar to  the command tail -f (follow a
file), i have been trying  with some while True and some microsleeps
(about .1 s); did someone has already done something like this?

And about the file is the apache acceslog  of a site with a lot of
traffic.

Regards    

joe / Joel Rivera



From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 02:08:24 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 06:08:24 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
Message-ID: <pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>

On Mon, 04 May 2009 17:54:50 -0400, Terry Reedy wrote:

> bearophileHUGS at lycos.com wrote:
> 
>> Another possible syntax:
>> 
>> def fact(n):
>>     return 1 if n <= 1 else n * return(n - 1)
>> 
>> But I guess most people don't see this problem as important&common
>> enough to justify changing the language.
> 
> Actually, I would like a way to refer to the current function from
> inside a function.  but I would like support in the language, so that
> the compiler patched the code after the function object is created to
> directly refer to the function object (or can the code object call the
> code object?) without any name lookup at all.

I don't know about avoiding name lookup, that smacks of deepest black 
magic, and Python doesn't usually do that. It does however do parlour 
tricks like `__name__` and `self`, suggests a solution.

I propose a small piece of sugar. When a function is entered, Python 
creates an ordinary local name in the function's local namespace, and 
binds the function itself to that name. Two possibilities for the name 
are `this` or `__this__`, analogous to `self` in methods and `__name__` 
in modules.

If there is any support for this, I propose to send the following (long) 
post to python-ideas. Feedback, corrections and suggestions welcome.


* * * 


Summary:

Most objects in Python don't need to know what name, or names (if any) 
they are bound to. Functions are a conspicuous exception to that rule: 
there are good reasons for a function to refer to itself, and the only 
straightforward way to do so is by name. I propose that on calling a 
function, Python should create a local name which refers to the function 
itself, giving the programmer the ability to have a function refer to 
itself without using its name.


There are (at least) four reasons for a function to refer to itself. In 
no particular order:

(1) User-friendly messages (for logging, errors or other):

def parrot():
    print "Error feeding cracker to function %r" % parrot


(2) Recursion:

def spam(n):
    if n < 0: return spam(-n).upper()
    return "spam "*n


(3) Introspection:

def spanish_inquisition():
    print inspect.getmembers(spanish_inquisition)


(4) Storing data between function calls:

def cheeseshop():
    if hasattr(cheeseshop, 'cheeses'):
        print "We have many fine cheeses"
    else:
        print "I'm sorry, I have been wasting your time"


I call these self-reflective functions.

In some cases there are alternatives e.g. cheeseshop could be written as 
a functor object, or some recursive functions can be re-written as 
iteration. Nevertheless such self-reflective functions are acceptable to 
many people, and consequently in moderately common use. How to have a 
function refer to itself is a common question, e.g. for newbies:

http://www.mail-archive.com/tutor%40python.org/msg35114.html

and even more experienced programmers:

http://article.gmane.org/gmane.comp.python.general/622020

(An earlier draft of this proposal was sent to that thread.)


However, none of these functions are robust in the face of the function 
being renamed, either at runtime or in the source code. In general, this 
will fail for any of the above functions:

func = spam
del spam
func()

Self-reflective functions like these are (almost?) unique in Python in 
that they require a known name to work correctly. You can rename a class, 
instance or module and expect it to continue to work, but not so for such 
functions. When editing source code, it is very easy to forget to change 
all the references to the function name within the body of itself 
function, even for small functions, and refactoring tools are overkill.

My proposal is for Python to automatically generate a local variable 
named either `this` or `__this__` when entering a function. This will 
allow any of the above functions to be re-written using the special name, 
and become robust against name changes.

def spanish_inquisition():
    print inspect.getmembers(__this__)

fang = spanish_inquisition
del spanish_inquisition
fang()


It will also allow lambda to use recursion:

lambda n: 0 if n <= 1 else __this__(n-1)

(This may count as a point against it, for those who dislike lambda.)


It is often useful to create two similar functions, or a variant of a 
function, without duplicating the source code. E.g. you might want a 
function that uses a cache, while still keeping around the version 
without a cache:

cached_function = memoize(function)
    
Currently, this does not give the expected results for recursive 
functions, nor does it give an error. It simply fails to behave as 
expected. Re-writing function() to use __this__ for the recursive call 
will solve that problem.


Q: Will `__this__` or `this` clash with existing variables?

I prefer `this` over `__this__`, for analogy with `self` inside methods. 
However it is more likely that existing code already uses the name 
`this`, since double-leading-and-trailing-underscore names are reserved 
for use by Python. Because `this` is an ordinary local variable, if a 
function assigns to it the function will work as expected. The only 
meaningful clash I can think of will occur when a function refers to a 
non-local name `this` without declaring it first. Another obvious clash 
may be:

def function():
    import this
    ...

Both of these are likely to be very rare.

Q: Will there be a performance penalty if every function defines the name 
`__this__` on entry?

I don't expect so, but if it is found to be a problem, a slightly more 
sophisticated strategy would be to only define `__this__` inside the 
function if the body of the function refers to that variable. That will 
allow the majority of functions which are not self-reflective to avoid 
paying that (probably minuscule) cost.


Q: Is this really necessary?

This is sugar, a convenience for the programmer. None of the problems it 
solves cannot be solved, or worked around, by other methods. 
Nevertheless, that the question "how do I have my function refer to 
itself?" keeps being asked over and over again suggests that the current 
solutions are (1) not obvious to newbies, and (2) not entirely 
satisfactory to more experienced programmers.


Here is a proof-of-concept pure Python implementation, using a decorator, 
and abusing a global variable. This is NOT to imply that `__this__` 
should be a global if this proposal goes ahead.


from functools import wraps
def make_this(func):
    global __this__
    __this__ = func
    @wraps(func)
    def f(*args, **kwargs):
        return func(*args, **kwargs)
    return f


>>> @make_this
... def spam(n):
...     if n < 0: return __this__(-n).upper()
...     return ' '.join([__this__.__name__] * n)
...
>>> tasty_meat_like_product = spam
>>> del spam
>>> tasty_meat_like_product(-3)
'SPAM SPAM SPAM'



-- 
Steven


From pavlovevidence at gmail.com  Tue May  5 02:09:25 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 4 May 2009 23:09:25 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com> 
	<pan.2009.05.05.03.22.33@REMOVE.THIS.cybersource.com.au>
Message-ID: <37e0021f-b50c-4f0c-8ba5-0beed01da029@z16g2000prd.googlegroups.com>

On May 4, 8:22?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 04 May 2009 15:51:15 -0700, Carl Banks wrote:
> > All
> > recursion does it make what you're doing a lot less readable for almost
> > all programmers.
>
> What nonsense.

It's not nonsense for a singly-linked list.  I don't need to be taught
the benefit of recursion, but whenever interation is suitable for an
algorithm/data structure, as it is with singly-linked lists, then it
is the more readable and more preferrable choice, especially in
Python.

In Python the One Obvious Way is iteration when possible, recursion
when necessary.


Carl Banks


From ur.liam at iksmlapan.reverse  Tue May  5 02:20:14 2009
From: ur.liam at iksmlapan.reverse (Napalmski)
Date: Tue, 5 May 2009 07:20:14 +0100
Subject: Question of UTF16BE encoding / decoding
References: <MPG.2469d7edf8bbcd0a989683@eu.news.astraweb.com>
	<mailman.5089.1241500903.11746.python-list@python.org>
Message-ID: <MPG.2469e0201cb6d830989684@eu.news.astraweb.com>

In article <mailman.5089.1241500903.11746.python-list at python.org>, 
metolone+gmane at gmail.com says...
> 
> 
> import binascii
> s = '004e006100700061006c006d'
> h = binascii.unhexlify(s)
> print h.decode('utf-16-be')
> 
> -Mark

And: 
name2 = name2.encode("utf-16-be")
print binascii.b2a_hex(name2)

to re-encode,
Thank you, much appreciated!


From sri_annauni at yahoo.co.in  Tue May  5 02:41:06 2009
From: sri_annauni at yahoo.co.in (srinivasan srinivas)
Date: Tue, 5 May 2009 12:11:06 +0530 (IST)
Subject: Which one is best Python or Java for developing GUI applications?
Message-ID: <793408.86105.qm@web7903.mail.in.yahoo.com>


Could you tell me does Python have any advantages over Java for the development of GUI applications?

Thanks,
Srini


      Now surf faster and smarter ! Check out the new Firefox 3 - Yahoo! Edition http://downloads.yahoo.com/in/firefox/?fr=om_email_firefox


From clp2 at rebertia.com  Tue May  5 02:46:58 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 4 May 2009 23:46:58 -0700
Subject: Self function
In-Reply-To: <pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com>

On Mon, May 4, 2009 at 11:08 PM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
> On Mon, 04 May 2009 17:54:50 -0400, Terry Reedy wrote:
>
>> bearophileHUGS at lycos.com wrote:
>>
>>> Another possible syntax:
>>>
>>> def fact(n):
>>> ? ? return 1 if n <= 1 else n * return(n - 1)
>>>
>>> But I guess most people don't see this problem as important&common
>>> enough to justify changing the language.
>>
>> Actually, I would like a way to refer to the current function from
>> inside a function. ?but I would like support in the language, so that
>> the compiler patched the code after the function object is created to
>> directly refer to the function object (or can the code object call the
>> code object?) without any name lookup at all.
>
> I don't know about avoiding name lookup, that smacks of deepest black
> magic, and Python doesn't usually do that. It does however do parlour
> tricks like `__name__` and `self`, suggests a solution.
>
> I propose a small piece of sugar. When a function is entered, Python
> creates an ordinary local name in the function's local namespace, and
> binds the function itself to that name. Two possibilities for the name
> are `this` or `__this__`, analogous to `self` in methods and `__name__`
> in modules.
>
> If there is any support for this, I propose to send the following (long)
> post to python-ideas. Feedback, corrections and suggestions welcome.

<snip entire excellent proposal text>

While I'm +0 on the proto-PEP, it doesn't currently address (or at
least rebut hard enough) the inevitable obvious naysayer argument
which will go along the lines of:

<devils_advocate>
Adding syntax is EVIL(tm) for it angers the Gods of Backwards
Compatibility, and this proposal is completely unnecessary because you
could instead just write:

def recursive(func):
    """We caved enough to allow this into functools."""
    def wrapper(*args, **kwds):
        return func(func, *args, **kwds)
    return wrapper
#####
from functools import recursive
@recursive
def spam(this, number_of_thy_counting):
    print " ".join([this.__name__.capitalize() + "!"]*number_of_thy_counting)

Which is not significantly more complex/longer/painful than learning
about __this__'s existence or typing the extra underscores and it
doesn't require any new syntax.

And the performance penalty for the proposed feature would actually be horrible!
And there would be much clashing with existing variable names, for
keywords are the Devil's work!
And your mother wears combat boots!
(etc...)
</devils_advocate>

You touch on this in "Is this really necessary?", but I think you're
going to prove more persuasively how drastically sweeter this syntax
sugar would be.

Cheers,
Chris
-- 
The Devil's Advocate-General
http://blog.rebertia.com


From debatem1 at gmail.com  Tue May  5 02:50:52 2009
From: debatem1 at gmail.com (CTO)
Date: Mon, 4 May 2009 23:50:52 -0700 (PDT)
Subject: Any idea to emulate tail -f
References: <mailman.5091.1241503147.11746.python-list@python.org>
Message-ID: <99114d6c-9d12-4b74-9b7c-ce32377a8b61@21g2000vbk.googlegroups.com>

On May 5, 2:00?am, Joel Juvenal Rivera Rivera <joel... at gmail.com>
wrote:
> I want to make something very similar to ?the command tail -f (follow a
> file), i have been trying ?with some while True and some microsleeps
> (about .1 s); did someone has already done something like this?
>
> And about the file is the apache acceslog ?of a site with a lot of
> traffic.
>
> Regards ? ?
>
> joe / Joel Rivera

You might want to try http://pyinotify.sourceforge.net/. Works well on
Linux systems. Otherwise, I'd watch the mtime on the file and fork to
handle the change.

Geremy Condra


From pavlovevidence at gmail.com  Tue May  5 02:55:41 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 4 May 2009 23:55:41 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com> 
	<f17fd77e-43b9-4d97-ba29-4790def4826d@z7g2000vbh.googlegroups.com> 
	<f6d22d90-b1e1-40f2-8647-834163638ce3@v35g2000pro.googlegroups.com> 
	<pan.2009.05.05.03.26.14@REMOVE.THIS.cybersource.com.au>
Message-ID: <04ed259e-01cf-459b-8664-a1dd6a23d60e@d19g2000prh.googlegroups.com>

On May 4, 8:26?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 04 May 2009 16:33:13 -0700, Carl Banks wrote:
> > On May 4, 4:06?pm, bearophileH... at lycos.com wrote:
> >> Carl Banks:
>
> >> >1. Singly-linked lists can and should be handled with iteration.<
>
> >> I was talking about a binary tree with list-like topology, of course.
>
> > "(every node has 1 child, and they are chained)"
>
> > That's a singly-linked list, not a tree. ?It's a degenerate tree at
> > best.
>
> A singly-linked list is a degenerate tree. Not "at best", but "is".

No, many implemenations of singly-linked lists aren't trees by any
definition.  You are probably thinking of the bastardized list-tree
spawn they use in Lisp.  But many implementations don't even bother
with a cons cell and just have the object itself refer to the next
object.  That is not a tree.

But even singly-linked lists implemented with cons cells can be
handled, and are better handled, with interation.


> >> >All recursion does it make what you're doing a lot less readable for
> >> >almost all programmers.<
>
> >> I can't agree.
>
> > If every child has one node you don't need recursion.
>
> And if one single node in the entire tree has two children, you do.

Then it't not a singly-linked list.  It's a tree.


> What
> are you suggesting, that Bearophile should write his tree-processing code
> to only deal with the degenerate case?

I'm suggesting that Bearophile should write recursive code for his
trees and iterative code for his lists.


> >> If the data structure is recursive (like a tree, or even sometimes
> >> graphs, etc) a recursive algorithm is shorter, more readable and more
> >> natural.
>
> > Because that's a tree, not a linked-list.
>
> And a linked list is a degenerate tree. If you have a non-self-balancing
> tree, sometimes it will be degenerate, and your code needs to deal with
> it.

If you have a tree, then you use recursive code.  If you have a list
you use iterative code.


> > Which is germane because Python's recursion limit is the thing you're
> > complaining about here, and you don't normally hit that limit with real
> > trees because they rarely go 1000 deep.
>
> And if just ONE branch of the tree goes 1000 deep, even if the rest of
> the tree is shallow, then you hit the default recursion limit.

Yeah, well, see that's just the point here.  Bearophile was asked if
any of his trees go 1000 deep, he said yes, his singly-linked lists
do.  Well, I'm sorry, that's not going to convince me, because
bearophile should be using iteration for the singly-linked lists.

Bearophile might very well have real trees that are 1000 deep, but
that's not going to convince me either, because IMO real trees rarely
do that, and Python's recursion limit can be increased in the rare
cases they do.

Bearophile and you are welcome to try to convince me that there are
lots of real trees out there that can't be handled with iteration and
that do go 1000 deep, and that this is a common enough problem that
Python should drastically improve support for recursion.  Until then I
will opine that it is adequate now for almost all purposes.


> > Singly-linked lists don't count because you don't need recursion for
> > them.
>
> If each node has two (or more) child fields, even if only one of those
> children is non-empty, then your data structure is a degenerate tree and
> does count.

If one of the fields is always empty, you don't need recursion to deal
with it.


> > [snip strawman example]
>
> It's not a strawman just because you don't like it.

No, it's a strawman because I said singly-linked lists don't need
recursion, and his counterexample was showing that recursion was
useful a tree.  Which was true, but it wasn't answering my argument.


> Dealing with
> degenerate trees is a genuine issue, and avoiding degenerate trees is the
> reason why people have developed more complicated structures like red-
> black trees.

I'm not talking about degenerate trees.  I'm talking about singly-
linked lists, which you DO NOT NEED, and SHOULD NOT USE, recursion to
deal with.


Carl Banks


From arnodel at googlemail.com  Tue May  5 03:09:27 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 5 May 2009 00:09:27 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <4b6c0d49-5a05-42ff-8990-9a483c0f62b9@g20g2000vba.googlegroups.com>

On 5 May, 07:08, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 04 May 2009 17:54:50 -0400, Terry Reedy wrote:
> > bearophileH... at lycos.com wrote:
>
> >> Another possible syntax:
>
> >> def fact(n):
> >> ? ? return 1 if n <= 1 else n * return(n - 1)
>
> >> But I guess most people don't see this problem as important&common
> >> enough to justify changing the language.
>
> > Actually, I would like a way to refer to the current function from
> > inside a function. ?but I would like support in the language, so that
> > the compiler patched the code after the function object is created to
> > directly refer to the function object (or can the code object call the
> > code object?) without any name lookup at all.
>
> I don't know about avoiding name lookup, that smacks of deepest black
> magic, and Python doesn't usually do that. It does however do parlour
> tricks like `__name__` and `self`, suggests a solution.
>
> I propose a small piece of sugar. When a function is entered, Python
> creates an ordinary local name in the function's local namespace, and
> binds the function itself to that name. Two possibilities for the name
> are `this` or `__this__`, analogous to `self` in methods and `__name__`
> in modules.
>
> If there is any support for this, I propose to send the following (long)
> post to python-ideas. Feedback, corrections and suggestions welcome.
>
> * * *
>
> Summary:
>
> Most objects in Python don't need to know what name, or names (if any)
> they are bound to. Functions are a conspicuous exception to that rule:
> there are good reasons for a function to refer to itself, and the only
> straightforward way to do so is by name. I propose that on calling a
> function, Python should create a local name which refers to the function
> itself, giving the programmer the ability to have a function refer to
> itself without using its name.
>
> There are (at least) four reasons for a function to refer to itself. In
> no particular order:
>
> (1) User-friendly messages (for logging, errors or other):
>
> def parrot():
> ? ? print "Error feeding cracker to function %r" % parrot
>
> (2) Recursion:
>
> def spam(n):
> ? ? if n < 0: return spam(-n).upper()
> ? ? return "spam "*n
>
> (3) Introspection:
>
> def spanish_inquisition():
> ? ? print inspect.getmembers(spanish_inquisition)
>
> (4) Storing data between function calls:
>
> def cheeseshop():
> ? ? if hasattr(cheeseshop, 'cheeses'):
> ? ? ? ? print "We have many fine cheeses"
> ? ? else:
> ? ? ? ? print "I'm sorry, I have been wasting your time"
>
> I call these self-reflective functions.
>
> In some cases there are alternatives e.g. cheeseshop could be written as
> a functor object, or some recursive functions can be re-written as
> iteration. Nevertheless such self-reflective functions are acceptable to
> many people, and consequently in moderately common use. How to have a
> function refer to itself is a common question, e.g. for newbies:
>
> http://www.mail-archive.com/tutor%40python.org/msg35114.html
>
> and even more experienced programmers:
>
> http://article.gmane.org/gmane.comp.python.general/622020
>
> (An earlier draft of this proposal was sent to that thread.)
>
> However, none of these functions are robust in the face of the function
> being renamed, either at runtime or in the source code. In general, this
> will fail for any of the above functions:
>
> func = spam
> del spam
> func()
>
> Self-reflective functions like these are (almost?) unique in Python in
> that they require a known name to work correctly. You can rename a class,
> instance or module and expect it to continue to work, but not so for such
> functions. When editing source code, it is very easy to forget to change
> all the references to the function name within the body of itself
> function, even for small functions, and refactoring tools are overkill.
>
> My proposal is for Python to automatically generate a local variable
> named either `this` or `__this__` when entering a function. This will
> allow any of the above functions to be re-written using the special name,
> and become robust against name changes.
>
> def spanish_inquisition():
> ? ? print inspect.getmembers(__this__)
>
> fang = spanish_inquisition
> del spanish_inquisition
> fang()
>
> It will also allow lambda to use recursion:
>
> lambda n: 0 if n <= 1 else __this__(n-1)
>
> (This may count as a point against it, for those who dislike lambda.)
>
> It is often useful to create two similar functions, or a variant of a
> function, without duplicating the source code. E.g. you might want a
> function that uses a cache, while still keeping around the version
> without a cache:
>
> cached_function = memoize(function)
>
> Currently, this does not give the expected results for recursive
> functions, nor does it give an error. It simply fails to behave as
> expected. Re-writing function() to use __this__ for the recursive call
> will solve that problem.
>
> Q: Will `__this__` or `this` clash with existing variables?
>
> I prefer `this` over `__this__`, for analogy with `self` inside methods.
> However it is more likely that existing code already uses the name
> `this`, since double-leading-and-trailing-underscore names are reserved
> for use by Python. Because `this` is an ordinary local variable, if a
> function assigns to it the function will work as expected. The only
> meaningful clash I can think of will occur when a function refers to a
> non-local name `this` without declaring it first. Another obvious clash
> may be:
>
> def function():
> ? ? import this
> ? ? ...
>
> Both of these are likely to be very rare.
>
> Q: Will there be a performance penalty if every function defines the name
> `__this__` on entry?
>
> I don't expect so, but if it is found to be a problem, a slightly more
> sophisticated strategy would be to only define `__this__` inside the
> function if the body of the function refers to that variable. That will
> allow the majority of functions which are not self-reflective to avoid
> paying that (probably minuscule) cost.
>
> Q: Is this really necessary?
>
> This is sugar, a convenience for the programmer. None of the problems it
> solves cannot be solved, or worked around, by other methods.
> Nevertheless, that the question "how do I have my function refer to
> itself?" keeps being asked over and over again suggests that the current
> solutions are (1) not obvious to newbies, and (2) not entirely
> satisfactory to more experienced programmers.
>
> Here is a proof-of-concept pure Python implementation, using a decorator,
> and abusing a global variable. This is NOT to imply that `__this__`
> should be a global if this proposal goes ahead.
>
> from functools import wraps
> def make_this(func):
> ? ? global __this__
> ? ? __this__ = func
> ? ? @wraps(func)
> ? ? def f(*args, **kwargs):
> ? ? ? ? return func(*args, **kwargs)
> ? ? return f
>
> >>> @make_this
>
> ... def spam(n):
> ... ? ? if n < 0: return __this__(-n).upper()
> ... ? ? return ' '.join([__this__.__name__] * n)
> ...>>> tasty_meat_like_product = spam
> >>> del spam
> >>> tasty_meat_like_product(-3)
>
> 'SPAM SPAM SPAM'
>
> --
> Steven- Hide quoted text -
>
> - Show quoted text -

Are you aware of PEP 3130? http://www.python.org/dev/peps/pep-3130/

(BTW, it seems to me that your implementation breaks as soon as two
functions are decorated - not tested!)

--
Arnaud


From debatem1 at gmail.com  Tue May  5 03:12:40 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 5 May 2009 00:12:40 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <611eb164-5eff-4021-8b1c-b45c0d85462f@l5g2000vbc.googlegroups.com>

On May 5, 2:08?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 04 May 2009 17:54:50 -0400, Terry Reedy wrote:
> > bearophileH... at lycos.com wrote:
>
> >> Another possible syntax:
>
> >> def fact(n):
> >> ? ? return 1 if n <= 1 else n * return(n - 1)
>
> >> But I guess most people don't see this problem as important&common
> >> enough to justify changing the language.
>
> > Actually, I would like a way to refer to the current function from
> > inside a function. ?but I would like support in the language, so that
> > the compiler patched the code after the function object is created to
> > directly refer to the function object (or can the code object call the
> > code object?) without any name lookup at all.
>
> I don't know about avoiding name lookup, that smacks of deepest black
> magic, and Python doesn't usually do that. It does however do parlour
> tricks like `__name__` and `self`, suggests a solution.
>
> I propose a small piece of sugar. When a function is entered, Python
> creates an ordinary local name in the function's local namespace, and
> binds the function itself to that name. Two possibilities for the name
> are `this` or `__this__`, analogous to `self` in methods and `__name__`
> in modules.
>
> If there is any support for this, I propose to send the following (long)
> post to python-ideas. Feedback, corrections and suggestions welcome.

[snip proposal]

I'm not all that in favor of this, but I think I've got another use
case
for you at http://code.activestate.com/recipes/576731/. The functions
written to use it would be a lot more standard looking at least.

Geremy Condra



From http  Tue May  5 03:22:48 2009
From: http (Paul Rubin)
Date: 05 May 2009 00:22:48 -0700
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
Message-ID: <7xk54wvws7.fsf@ruckus.brouhaha.com>

bearophileHUGS at lycos.com writes:
> This happens to me more than one time every year.
> So I have written this:
> ...
>         self_name = getframeinfo(currentframe()).function

ZOMG, you've got to be kidding.  I'd expect Pylint to catch that sort
of error statically.  If not, the best approach is probably to extend
Pylint to handle those cases.  The frame crawling stuff just comes
across as madness to me.


From http  Tue May  5 03:23:21 2009
From: http (Paul Rubin)
Date: 05 May 2009 00:23:21 -0700
Subject: Which one is best Python or Java for developing GUI applications?
References: <mailman.5092.1241505670.11746.python-list@python.org>
Message-ID: <7xfxfkvwra.fsf@ruckus.brouhaha.com>

srinivasan srinivas <sri_annauni at yahoo.co.in> writes:
> Could you tell me does Python have any advantages over Java for the development of GUI applications?

Yes.


From paul.nospam at rudin.co.uk  Tue May  5 03:26:56 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Tue, 05 May 2009 08:26:56 +0100
Subject: Which one is best Python or Java for developing GUI applications?
References: <mailman.5092.1241505670.11746.python-list@python.org>
	<7xfxfkvwra.fsf@ruckus.brouhaha.com>
Message-ID: <87d4ao9fi7.fsf@rudin.co.uk>

Paul Rubin <http://phr.cx at NOSPAM.invalid> writes:

> srinivasan srinivas <sri_annauni at yahoo.co.in> writes:
>> Could you tell me does Python have any advantages over Java for the
>> development of GUI applications?
>
> Yes.

Clearly c.l.p needs to adopt the SNB <http://cam.misc.org.uk/snb>
convention :) 


From gallium.arsenide at gmail.com  Tue May  5 03:32:03 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Tue, 5 May 2009 00:32:03 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com>
Message-ID: <991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com>

On May 5, 1:12?am, John Yeung <gallium.arsen... at gmail.com> wrote:

> [...] the problem may require bigger guns (either much better
> math or much more sophisticated programming).

Yes, I'm responding to myself.

Well, I went ahead with the approach I mentioned earlier, generating
all possible matches and then selecting among them as needed to fill
up the courts, trying to keep the number of matches played by each
player as fair as possible.  (I should mention that this, or something
similar, was suggested earlier by someone else in a different thread,
in response to the same question by the same OP.)

I did use "bigger guns" (mainly a class for player objects, with
custom __cmp__ method), but still didn't do anything with doubles.

I haven't tested it much, but I'll post it if anyone's interested.
(That way people can pick on me instead of the OP. ;)

John


From bruno.42.desthuilliers at websiteburo.invalid  Tue May  5 03:37:01 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 05 May 2009 09:37:01 +0200
Subject: Personal recommendations for Python and Django on-boarding
	materials
In-Reply-To: <m2k54wr6i6.fsf@googlemail.com>
References: <61ac6511-0f9e-458d-b3f1-5b153939293f@r34g2000vba.googlegroups.com>
	<m2k54wr6i6.fsf@googlemail.com>
Message-ID: <49ffec97$0$27576$426a74cc@news.free.fr>

Arnaud Delobelle a ?crit :
> Grant Rettke <grettke at gmail.com> writes:
> 
>> Hi folks,
>>
>> From one developer to another, I am looking for some personal
>> recommendations on what are the best materials for fast tracking an on-
>> boarding to Python and Django.
>>
>> I know how to program, get web apps and OO; this is the audience.
>>
>> I have found some good recommendations and stuff on Amazon and various
>> websites, but if I could get some humans vouching for things directly
>> that would be worth a lot more.
>>
>> Best wishes,
>>
>> Grant
> 
> I've learnt both Python and Django using the tutorials, the docs and
> lots of experimentation.

<aol />

>  Django now have a book [1] which might be
> useful to read.
> 
> [1] http://djangobook.com/
> 

<op>
You may also want to join the django-users group, browse 
django-snippets, and read James Bennet's blog.
</op>


From bruno.42.desthuilliers at websiteburo.invalid  Tue May  5 03:37:41 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 05 May 2009 09:37:41 +0200
Subject: Which one is best Python or Java for developing GUI applications?
In-Reply-To: <7xfxfkvwra.fsf@ruckus.brouhaha.com>
References: <mailman.5092.1241505670.11746.python-list@python.org>
	<7xfxfkvwra.fsf@ruckus.brouhaha.com>
Message-ID: <49ffecbf$0$27576$426a74cc@news.free.fr>

Paul Rubin a ?crit :
> srinivasan srinivas <sri_annauni at yahoo.co.in> writes:
>> Could you tell me does Python have any advantages over Java for the development of GUI applications?
> 
> Yes.

Indeed.


From mail at microcorp.co.za  Tue May  5 03:41:37 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 5 May 2009 09:41:37 +0200
Subject: Tkinter, Trouble with Message,Label widget
References: <mailman.5017.1241392410.11746.python-list@python.org><4f61c431-1c78-4de7-9b82-08eee09ae7d6@s20g2000vbp.googlegroups.com>
	<49FF853B.7040404@hughes.net>
Message-ID: <009201c9cd54$f1ac07e0$0d00a8c0@Hendrik>

"norseman" <norseman at hughes.net> wrote:

> Hendrik van Rooyen  mentioned the textvar too.  Thanks Hendrik

Yeah - and also omitted to mention the set method.
With friends like that, who needs enemies?

- Hendrik



From QJing.Li at gmail.com  Tue May  5 03:50:44 2009
From: QJing.Li at gmail.com (Leon)
Date: Tue, 5 May 2009 00:50:44 -0700 (PDT)
Subject: Which one is best Python or Java for developing GUI applications?
References: <mailman.5092.1241505670.11746.python-list@python.org>
Message-ID: <4da39bb0-7bfe-48bf-a843-0e79e567a56d@r3g2000vbp.googlegroups.com>

I think there are two advantages over java for GUI application

First, python is more productive and has very rich third modules
support,
you can check the demo of wxPython.

Second, you can develop native-looking GUI

BTW: I'm developing GUI application using python and wxPython.



Second,
On May 4, 11:41?pm, srinivasan srinivas <sri_anna... at yahoo.co.in>
wrote:
> Could you tell me does Python have any advantages over Java for the development of GUI applications?
>
> Thanks,
> Srini
>
> ? ? ? Now surf faster and smarter ! Check out the new Firefox 3 - Yahoo! Editionhttp://downloads.yahoo.com/in/firefox/?fr=om_email_firefox



From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 03:51:19 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 07:51:19 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
	<pan.2009.05.05.03.22.33@REMOVE.THIS.cybersource.com.au>
	<37e0021f-b50c-4f0c-8ba5-0beed01da029@z16g2000prd.googlegroups.com>
Message-ID: <pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>

On Mon, 04 May 2009 23:09:25 -0700, Carl Banks wrote:

> On May 4, 8:22?pm, Steven D'Aprano
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> On Mon, 04 May 2009 15:51:15 -0700, Carl Banks wrote:
>> > All
>> > recursion does it make what you're doing a lot less readable for
>> > almost all programmers.
>>
>> What nonsense.
> 
> It's not nonsense for a singly-linked list.

def ivisit(node):
    print node
    while node and node.link is not None:
        node = node.link
        print node

def rvisit(node):
    print node
    if node and node.link is not None:
        rvisit(node.link)


If there are programmers who find rvisit "a lot less readable" than 
ivisit, then in my arrogant opinion they should consider a change of 
profession.



> I don't need to be taught
> the benefit of recursion, but whenever interation is suitable for an
> algorithm/data structure, as it is with singly-linked lists, then it is
> the more readable and more preferrable choice, especially in Python.

Most (all?) recursive algorithms can be re-written as iteration. For many 
recursive algorithms (but not all) the cost for doing so is to simulate 
recursion yourself by managing your own stack. By making such an 
absolutist claim, you're claiming that it is "more readable" and "more 
preferable" to manage your own stack than to let the compiler do so. 
That's clearly nonsense.

Whenever iteration gives a simpler and more readable algorithm than 
recursion, then it should be preferred on account of being simpler and 
more readable. That's not just a no-brainer, it's a tautology. "Whenever 
iteration is simpler, it's simpler." But that's a far cry from what you 
said: that recursion, as a general technique, is "a lot less readable" 
for "almost all" programmers.


 
> In Python the One Obvious Way is iteration when possible, recursion when
> necessary.

There's nothing "obvious" about solving the 8 Queens problem using 
iteration. Or walking a binary tree. Or generating all the permutations 
of a list.

But don't just tell me that recursion isn't Pythonic. Tell Guido:

http://www.python.org/doc/essays/graphs.html

I quote:

"These [recursive] functions are about as simple as they get. Yet, they 
are nearly optimal (for code written in Python)."



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 03:58:15 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 07:58:15 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<4b6c0d49-5a05-42ff-8990-9a483c0f62b9@g20g2000vba.googlegroups.com>
Message-ID: <pan.2009.05.05.07.58.15@REMOVE.THIS.cybersource.com.au>

On Tue, 05 May 2009 00:09:27 -0700, Arnaud Delobelle wrote:

> Are you aware of PEP 3130? http://www.python.org/dev/peps/pep-3130/

I am now. Very disappointing.

> (BTW, it seems to me that your implementation breaks as soon as two
> functions are decorated - not tested!)

Of course it does! That's why I warned that I was "abusing a global 
variable", and that it should not be read as meaning that I wanted 
__this__ to be global. I want it to be local to the function.


If somebody can tell me how to inject a new local name into a function, 
that would be far preferable to using global in the decorator.



-- 
Steven


From pavlovevidence at gmail.com  Tue May  5 04:25:49 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 5 May 2009 01:25:49 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com> 
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com> 
	<pan.2009.05.05.03.22.33@REMOVE.THIS.cybersource.com.au>
	<37e0021f-b50c-4f0c-8ba5-0beed01da029@z16g2000prd.googlegroups.com>
	<pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>
Message-ID: <5a8c7e8b-8b3d-4a47-9ac6-23bc85b512f4@d7g2000prl.googlegroups.com>

On May 5, 12:51?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 04 May 2009 23:09:25 -0700, Carl Banks wrote:
> > In Python the One Obvious Way is iteration when possible, recursion when
> > necessary.
>
> There's nothing "obvious" about solving the 8 Queens problem using
> iteration. Or walking a binary tree. Or generating all the permutations
> of a list.

*Sigh*  Well, I'm out of this debate.  Apparently it's not possible to
argue that recursivie algorithms should be avoided *sometimes* without
everyone citing cases that obviously aren't from those times (as if I
had been arguing that recursion should be avoided all the time).

Here's a parting thought for you to cite "counterexamples" of:

Iteration should be used instead of recursion anywhere a tail-
recursive algorithm is possible.  Recursion should be used only when
tail-recursion is not possible.


Carl Banks


From pscott at uwc.ac.za  Tue May  5 04:32:38 2009
From: pscott at uwc.ac.za (Paul Scott)
Date: Tue, 05 May 2009 10:32:38 +0200
Subject: Any idea to emulate tail -f
In-Reply-To: <99114d6c-9d12-4b74-9b7c-ce32377a8b61@21g2000vbk.googlegroups.com>
References: <mailman.5091.1241503147.11746.python-list@python.org>
	<99114d6c-9d12-4b74-9b7c-ce32377a8b61@21g2000vbk.googlegroups.com>
Message-ID: <1241512358.6541.16.camel@paul-laptop>

On Mon, 2009-05-04 at 23:50 -0700, CTO wrote:
> You might want to try http://pyinotify.sourceforge.net/. Works well on
> Linux systems. Otherwise, I'd watch the mtime on the file and fork to
> handle the change.
> 

pyinotify works really well. If you need to watch a file, simply use the
IN_MODIFY watch to fire off a notification when the file changes. Then
you can use that event in anything you may need.

I put up some basic pyinotify usage here:
http://www.paulscott.za.net/index.php?module=jabberblog&postid=ps123_2560_1240747637&action=viewsingle but if you need some more help with it, read the docs and then ask me also

-- Paul
http://www.paulscott.za.net
http://twitter.com/paulscott56
http://avoir.uwc.ac.za
-- 



From wolfram.hinderer at googlemail.com  Tue May  5 04:35:17 2009
From: wolfram.hinderer at googlemail.com (wolfram.hinderer at googlemail.com)
Date: Tue, 5 May 2009 01:35:17 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>

On 5 Mai, 08:08, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:

> Self-reflective functions like these are (almost?) unique in Python in
> that they require a known name to work correctly. You can rename a class,
> instance or module and expect it to continue to work, but not so for such
> functions. When editing source code, it is very easy to forget to change
> all the references to the function name within the body of itself
> function, even for small functions, and refactoring tools are overkill.

It is easy to change all references of the function name, except for
those in the function body itself? That needs some explantation.

> It is often useful to create two similar functions, or a variant of a
> function, without duplicating the source code. E.g. you might want a
> function that uses a cache, while still keeping around the version
> without a cache:
>
> cached_function = memoize(function)
>
> Currently, this does not give the expected results for recursive
> functions, nor does it give an error. It simply fails to behave as
> expected. Re-writing function() to use __this__ for the recursive call
> will solve that problem.

Won't __this__ (inside function) still refer to function, not
cached_function?

> Here is a proof-of-concept pure Python implementation, using a decorator,
> and abusing a global variable. This is NOT to imply that `__this__`
> should be a global if this proposal goes ahead.
>
> from functools import wraps
> def make_this(func):
> ? ? global __this__
> ? ? __this__ = func
> ? ? @wraps(func)
> ? ? def f(*args, **kwargs):
> ? ? ? ? return func(*args, **kwargs)
> ? ? return f

This still has the memoizing problem.


From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 04:37:28 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 08:37:28 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
	<f17fd77e-43b9-4d97-ba29-4790def4826d@z7g2000vbh.googlegroups.com>
	<f6d22d90-b1e1-40f2-8647-834163638ce3@v35g2000pro.googlegroups.com>
	<pan.2009.05.05.03.26.14@REMOVE.THIS.cybersource.com.au>
	<04ed259e-01cf-459b-8664-a1dd6a23d60e@d19g2000prh.googlegroups.com>
Message-ID: <pan.2009.05.05.08.37.27@REMOVE.THIS.cybersource.com.au>

On Mon, 04 May 2009 23:55:41 -0700, Carl Banks wrote:

> On May 4, 8:26?pm, Steven D'Aprano
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> On Mon, 04 May 2009 16:33:13 -0700, Carl Banks wrote:
>> > On May 4, 4:06?pm, bearophileH... at lycos.com wrote:
>> >> Carl Banks:
>>
>> >> >1. Singly-linked lists can and should be handled with iteration.<
>>
>> >> I was talking about a binary tree with list-like topology, of
>> >> course.
>>
>> > "(every node has 1 child, and they are chained)"
>>
>> > That's a singly-linked list, not a tree. ?It's a degenerate tree at
>> > best.
>>
>> A singly-linked list is a degenerate tree. Not "at best", but "is".
> 
> No, many implemenations of singly-linked lists aren't trees by any
> definition.

I would say not. Nodes with a single link field can't form a tree, 
because you can't give it a left and right child. However trees can 
degenerate into a singly-linked list, where each node has at least one 
unused child. That is what both Bearophile and I are trying to tell you. 
It's not that anyone sane thinks "I know, I'll use a binary tree to 
implement a linked list" -- that would be stupid, and shame on you for 
thinking that Bearophile is that stupid. But if you insert data into a 
non-self-balancing tree, sometimes the tree will degenerate into a linked 
list with extra, unused child links.


[...]
> But even singly-linked lists implemented with cons cells can be handled,
> and are better handled, with interation.

Can be, certainly.

Better? Maybe.


>> >> >All recursion does it make what you're doing a lot less readable
>> >> >for almost all programmers.<
>>
>> >> I can't agree.
>>
>> > If every child has one node you don't need recursion.
>>
>> And if one single node in the entire tree has two children, you do.
> 
> Then it't not a singly-linked list.  It's a tree.

It was already a tree. It's just that the entire tree happened to form 
one long chain.



>> What
>> are you suggesting, that Bearophile should write his tree-processing
>> code to only deal with the degenerate case?
> 
> I'm suggesting that Bearophile should write recursive code for his trees
> and iterative code for his lists.

But his tree-handling recursive code MUST and WILL operate on degenerate 
trees that form chains (linked lists), unless he writes more complicated 
code to avoid it (e.g. red-black trees). For simple trees, you don't have 
the luxury of saying "Oh, my trees will never be degenerate, they'll 
always be optimal, with the minimum depth possible." You get the trees 
you're given, and sometimes they'll be one long branch with no, or very 
fewer, off-shoots, and you'll have O(N) performance instead of O(log N).

And the clever thing?

Just write the recursive code, as normal, and it will magically handle 
the degenerate case too.



>> >> If the data structure is recursive (like a tree, or even sometimes
>> >> graphs, etc) a recursive algorithm is shorter, more readable and
>> >> more natural.
>>
>> > Because that's a tree, not a linked-list.
>>
>> And a linked list is a degenerate tree. If you have a
>> non-self-balancing tree, sometimes it will be degenerate, and your code
>> needs to deal with it.
> 
> If you have a tree, then you use recursive code.  If you have a list you
> use iterative code.

I wish to retract my poorly worded comment "And a linked list is a 
degenerate tree". That is incorrect. What I should have said is that a 
degenerate tree behaves equivalently to a linked list, rather than "is".



>> > Which is germane because Python's recursion limit is the thing you're
>> > complaining about here, and you don't normally hit that limit with
>> > real trees because they rarely go 1000 deep.
>>
>> And if just ONE branch of the tree goes 1000 deep, even if the rest of
>> the tree is shallow, then you hit the default recursion limit.
> 
> Yeah, well, see that's just the point here.  Bearophile was asked if any
> of his trees go 1000 deep, he said yes, his singly-linked lists do. 

He certainly did not say anything of the sort.


> Well, I'm sorry, that's not going to convince me, because bearophile
> should be using iteration for the singly-linked lists.

What Bearophile actually wrote was:

"You are thinking just about complete binary trees. But consider that a 
topology LIKE a single linked list (every node has 1 child, and they are 
chained) is a true binary tree still." [Emphasis added.]

It should be obvious what he means. But if, by some chance, you 
misunderstood what he said, he replied to your earlier post and explained 
further:

"I was talking about a binary tree with list-like topology, of course."

If you don't understand what a binary-tree with a list-like topology is, 
then I respectfully suggest that you are unqualified to have an opinion 
in this discussion and you should come back when you've learned what a 
binary-tree with a list-like topology actually is, and why your 
suggestion that he use iteration on linked lists is, to quote Wolfgang 
Pauli, Not Even Wrong.


> Bearophile might very well have real trees that are 1000 deep, but
> that's not going to convince me either, because IMO real trees rarely do
> that, and Python's recursion limit can be increased in the rare cases
> they do.

Are you saying that Bearophile's trees are imaginary? That's he's making 
them up?

Personally, I don't think it's good to have a function fail just because 
it has to recurse over a mere 1000 items. I think that's as poor as some 
hypothetical language where you can't iterate over more than 1000 items, 
and if you try, you have to catch the exception, increase the iteration 
limit, and try again. People wouldn't stand for it.

Oh, I understand *why* Python has that limitation. It's just a black mark 
on an otherwise wonderful language.


[...]
>> > Singly-linked lists don't count because you don't need recursion for
>> > them.
>>
>> If each node has two (or more) child fields, even if only one of those
>> children is non-empty, then your data structure is a degenerate tree
>> and does count.
> 
> If one of the fields is always empty, you don't need recursion to deal
> with it.

That's just silly. How do you know that one of the fields is always empty 
until you've walked the tree?



[...]
> I'm not talking about degenerate trees.  I'm talking about singly-
> linked lists, which you DO NOT NEED, and SHOULD NOT USE, recursion to
> deal with.

Ah, then you are the one introducing the straw man, because Bearophile is 
talking about trees.



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 04:46:41 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 05 May 2009 08:46:41 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
	<pan.2009.05.05.03.22.33@REMOVE.THIS.cybersource.com.au>
	<37e0021f-b50c-4f0c-8ba5-0beed01da029@z16g2000prd.googlegroups.com>
	<pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>
	<5a8c7e8b-8b3d-4a47-9ac6-23bc85b512f4@d7g2000prl.googlegroups.com>
Message-ID: <pan.2009.05.05.08.46.40@REMOVE.THIS.cybersource.com.au>

On Tue, 05 May 2009 01:25:49 -0700, Carl Banks wrote:

> *Sigh*  Well, I'm out of this debate.  Apparently it's not possible to
> argue that recursivie algorithms should be avoided *sometimes* without
> everyone citing cases that obviously aren't from those times (as if I
> had been arguing that recursion should be avoided all the time).

You overstated your position, and then instead of gracefully admitting 
that you overstated it, you're trying to weasel out of it by acting the 
victim. If all you had said was that "sometimes" recursion should be 
avoided, then who could argue against that? Scheme purists? Pah, this is 
Python, we don't need no stinkin' mathematical purity!

Practicality beats purity is *precisely* why sometimes you need recursion 
instead of forcing a complicated iterative solution onto a simple 
recursive problem.


> Here's a parting thought for you to cite "counterexamples" of:
> 
> Iteration should be used instead of recursion anywhere a tail- recursive
> algorithm is possible. Recursion should be used only when
> tail-recursion is not possible.

Or when the recursive algorithm is simpler than the iterative algorithm, 
and you don't care about squeezing out every last tiny micro-optimization 
into the code.



-- 
Steven


From sri_annauni at yahoo.co.in  Tue May  5 05:11:28 2009
From: sri_annauni at yahoo.co.in (srinivasan srinivas)
Date: Tue, 5 May 2009 14:41:28 +0530 (IST)
Subject: Which one is best Python or Java for developing GUI applications?
In-Reply-To: <49ffecbf$0$27576$426a74cc@news.free.fr>
References: <mailman.5092.1241505670.11746.python-list@python.org>
	<7xfxfkvwra.fsf@ruckus.brouhaha.com>
	<49ffecbf$0$27576$426a74cc@news.free.fr>
Message-ID: <629374.1103.qm@web7904.mail.in.yahoo.com>


Could you list down those advantages??



----- Original Message ----
From: Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>
To: python-list at python.org
Sent: Tuesday, 5 May, 2009 1:07:41 PM
Subject: Re: Which one is best Python or Java for developing GUI applications?

Paul Rubin a ?crit :
> srinivasan srinivas <sri_annauni at yahoo.co.in> writes:
>> Could you tell me does Python have any advantages over Java for the development of GUI applications?
> 
> Yes.

Indeed.
--
http://mail.python.org/mailman/listinfo/python-list



      Cricket on your mind? Visit the ultimate cricket website. Enter http://beta.cricket.yahoo.com


From umut.tabak at gmail.com  Tue May  5 05:21:27 2009
From: umut.tabak at gmail.com (utab)
Date: Tue, 5 May 2009 02:21:27 -0700 (PDT)
Subject: change some lines from a read file
References: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>
	<mailman.5061.1241467868.11746.python-list@python.org>
Message-ID: <9cf75556-a58c-4079-b457-da88b0370a1d@s16g2000vbp.googlegroups.com>

On May 4, 10:06?pm, Anthra Norell <anthra.nor... at bluewin.ch> wrote:
> utab wrote:
> > Dear all,
>
> > I have to change some lines from a template file, which is rather long
> > to paste here, but I would like to make some parts of some lines
> > optional with my command line arguments but I could not see this
> > directly, I can count the line numbers and decide on this basis to
> > decide the lines to be configured to my will.
>
> > More specifically, say, I have a that file includes
>
> > this is an example python file to play around
> > .
> > .
> > .
> > some lines
> > .
> > .
> > .
> > . -> an option line for example.
> > .
> > .
> > .
> > -> another option line so on.
>
> > and execute the script
> > ./myScript option1 option2
>
> > so that the options at correct locations will be written.
>
> > Any other options for this simple job that i can improve my Python a
> > bit as well.
>
> > Best,
> > Umut
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> Your description is not explicit enough to convey your intention. If
> your template file is too long to post, post a short representative
> section, an input data sample and a hand-edited sample of the output
> data you want to generate. You will get more and better advice. .
>
> Frederic

Thanks here is a  sample Session file from a commercial finite element
pre-post processor PATRAN, the file longer but the ideas are the same
so that let me give an example, say I would like to make write line 10
composed of some command line arguments: path+database_name, Also
there are some lines similar to this in the below sections of the
file. I am doing it with a if-elif-else clause checking the line
numbers with which I thought of there should be a better way and ended
up asking...

     1 $# Session file patran.ses.02 started recording at 05-May-09
11:12:25
     2 $# Build: 15.0.038 Mon Aug 20 21:31:45 PDT 2007
     3 $# Recorded by: Patran 2007 r1b
     4 $# FLEXlm initialization complete.  Acquiring license(s)...
     5 $# License File: /opt/patran-2007r1b/license.dat
     6 $# Patran 2007 r1b has obtained 1 concurrent license(s) from
FLEXlm per a
     7 $# request to execute on Linux node hpc06(001e4f20c494) (Linux
     8 $# 2.6.23.15-80.fc7) at 05-May-09 11:12:25.
     9 uil_file_new.go( "/opt/patran-2007r1b/template.db",  @
    10 "/home/utabak/PATRAN/cavityModels/fromGmsh.db" )
    11 $# Question from application FILE
    12 $#     Database /home/utabak/PATRAN/cavityModels/fromGmsh.db
already exists.
    13 $# Do you wish to delete the existing database and create a new
one ?
    14 $? YES 36000002
    15 $# Copying /opt/patran-2007r1b/template.db to
    16 $# /home/utabak/PATRAN/cavityModels/fromGmsh.db
    17 $# Template copy complete.
    18 $# Database version 3.8 created by Patran 2007 r1b successfully
opened.
    19 ga_viewport_size_set( "default_viewport", 14.571214, 7.509466,
1 )
    20 ga_viewport_location_set( "default_viewport", 0.000000,
1.088771, 1 )
    21 $# Creating journal file /home/utabak/PATRAN/cavityModels/
fromGmsh.db.jou at
    22 $# 05-May-09 11:12:43
    23 nastran_input_import( "/home/utabak/PATRAN/cavityModels/
toPatran.bdf",  @
    24 "default_group", 10, [TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE,
TRUE, FALSE,  @
    25 TRUE], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0,
0, 0], [ @
    26 -2000000000, -2000000000, -2000000000, -2000000000,
-2000000000, -2000000000,  @
    27 -2000000000, -2000000000, 0, 0] )
    28 $# Reading of MSC.Nastran input file completed.
    29 ui_exec_function( "mesh_seed_display_mgr", "init" )

Best,


From clp2 at rebertia.com  Tue May  5 05:28:15 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 5 May 2009 02:28:15 -0700
Subject: Which one is best Python or Java for developing GUI applications?
In-Reply-To: <87d4ao9fi7.fsf@rudin.co.uk>
References: <mailman.5092.1241505670.11746.python-list@python.org>
	<7xfxfkvwra.fsf@ruckus.brouhaha.com> <87d4ao9fi7.fsf@rudin.co.uk>
Message-ID: <50697b2c0905050228l5fee0351re35f61f0fe9d35ab@mail.gmail.com>

On Tue, May 5, 2009 at 12:26 AM, Paul Rudin <paul.nospam at rudin.co.uk> wrote:
> Paul Rubin <http://phr.cx at NOSPAM.invalid> writes:
>
>> srinivasan srinivas <sri_annauni at yahoo.co.in> writes:
>>> Could you tell me does Python have any advantages over Java for the
>>> development of GUI applications?
>>
>> Yes.
>
> Clearly c.l.p needs to adopt the SNB <http://cam.misc.org.uk/snb>
> convention :)

Surely you have forgotten the comedy style of the language's namesake,
which makes that rule completely inadmissible! ;P

Cheers,
Chris
-- 
http://blog.rebertia.com


From ldo at geek-central.gen.new_zealand  Tue May  5 05:46:38 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 05 May 2009 21:46:38 +1200
Subject: Any idea to emulate tail -f
References: <mailman.5091.1241503147.11746.python-list@python.org>
Message-ID: <gtp1tu$rv1$3@lust.ihug.co.nz>

In message <mailman.5091.1241503147.11746.python-list at python.org>, Joel 
Juvenal Rivera Rivera wrote:

> I want to make something very similar to  the command tail -f (follow a
> file) ...

<http://codecodex.com/wiki/index.php?title=Monitoring_a_Log_File>



From QJing.Li at gmail.com  Tue May  5 06:05:51 2009
From: QJing.Li at gmail.com (Leon)
Date: Tue, 5 May 2009 03:05:51 -0700 (PDT)
Subject: what's the best way to call a method of object without a guarantee of
	its existence
Message-ID: <22690572-e338-483a-a99a-85ccf6c5fae6@x6g2000vbg.googlegroups.com>

One way,  define the object before it is used,
like this:
object = None
.....
.....

if object is not None:
   object.method()

The other way, using try ... catch
try:
     object.method()
catch NameError:
     pass

for  big programs, which is better, or any other way?

Miles




From grflanagan at gmail.com  Tue May  5 06:22:43 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Tue, 05 May 2009 11:22:43 +0100
Subject: find sublist inside list
In-Reply-To: <gtmlsk$q51$1@amma.irisa.fr>
References: <gtmlsk$q51$1@amma.irisa.fr>
Message-ID: <gtp41k$mvb$1@ger.gmane.org>

Matthias Gall? wrote:
> Hi.
> 
> My problem is to replace all occurrences of a sublist with a new element.
> 
> Example:
> Given ['a','c','a','c','c','g','a','c'] I want to replace all 
> occurrences of ['a','c'] by 6 (result [6,6,'c','g',6]).
> 

For novelty value:

from itertools import izip

def replace2(data, pattern):
     assert len(pattern) == 2
     pattern = tuple(pattern)
     icopy = iter(data)
     icopy.next()
     gen = izip(data, icopy)
     while True:
         item = gen.next()
         if item == pattern:
             yield '6'
             gen.next()
         else:
             yield item[0]

# works if list ends with ['a', 'c']
data = ['g', 'a', 'c', 'a', 'c', 'a', 'a', 'a', 'g', 'a', 'c']
want = 'g66aaag6'
assert ''.join(replace2(data, ['a', 'c'])) == want

# otherwise you lose the last element of the tail
data = ['g', 'a', 'c', 'a', 'c', 'a', 'a', 'a', 'g', 'a', 'c', 'c', 'g']
want = 'g66aaag6cg'
get = 'g66aaag6c'
assert not ''.join(replace2(data, ['a', 'c'])) == want
assert ''.join(replace2(data, ['a', 'c'])) == get

# fix by adding the pattern to the end of the data as a sentinel

def replace2(data, pattern):
     assert len(pattern) == 2
     def _replace2(data, pattern):
         pattern = tuple(pattern)
         icopy = iter(data)
         icopy.next()
         gen = izip(data, icopy)
         while True:
             item = gen.next()
             if item == pattern:
                 yield '6'
                 gen.next()
             else:
                 yield item[0]
     data = data + pattern
     return list(_replace2(data, pattern))[:-1]

data = ['g', 'a', 'c', 'a', 'c', 'a', 'a', 'a', 'g', 'a', 'c']
want = 'g66aaag6'
assert ''.join(replace2(data, ['a', 'c'])) == want

data = ['g', 'a', 'c', 'a', 'c', 'a', 'a', 'a', 'g', 'a', 'c', 'c', 'g']
want = 'g66aaag6cg'
assert ''.join(replace2(data, ['a', 'c'])) == want

print 'done'



From iainking at gmail.com  Tue May  5 06:24:29 2009
From: iainking at gmail.com (Iain King)
Date: Tue, 5 May 2009 03:24:29 -0700 (PDT)
Subject: Any idea to emulate tail -f
References: <mailman.5091.1241503147.11746.python-list@python.org>
Message-ID: <55f6d122-187f-4796-8162-78b066875c4d@q14g2000vbn.googlegroups.com>

On May 5, 7:00?am, Joel Juvenal Rivera Rivera <joel... at gmail.com>
wrote:
> I want to make something very similar to ?the command tail -f (follow a
> file), i have been trying ?with some while True and some microsleeps
> (about .1 s); did someone has already done something like this?
>
> And about the file is the apache acceslog ?of a site with a lot of
> traffic.
>
> Regards ? ?
>
> joe / Joel Rivera

This is very interesting, about using Generator Expressions:
http://209.85.229.132/search?q=cache:ZHrV4E0eTI8J:www.dabeaz.com/generators/Generators.pdf

Relevant stuff about 'tail -f' is on page 39, but I'd read the whole
thing if you can.

Iain


From marco at sferacarta.com  Tue May  5 06:25:08 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Tue, 05 May 2009 12:25:08 +0200
Subject: what's the best way to call a method of object without a guarantee
	of  its existence
In-Reply-To: <22690572-e338-483a-a99a-85ccf6c5fae6@x6g2000vbg.googlegroups.com>
References: <22690572-e338-483a-a99a-85ccf6c5fae6@x6g2000vbg.googlegroups.com>
Message-ID: <9uULl.4199$Ux.2825@tornado.fastwebnet.it>

Leon wrote:

> One way,  define the object before it is used,
> like this:
> object = None

This is a good practice anyway. Conditional existance of objects is 
quite evil. Resorting to if defined('foo') is double-plus-ugly.


> The other way, using try ... catch
> try:
>      object.method()
> catch NameError:
>      pass

Except you should trap AttributeError because you defined the thing as 
None before. NameErrors should be fixed as bugs, not trapped (IMHO -- 
but in python there is always a use case for everything).

Keep in mind that AttributeError might come from inside the method(), 
which could be confusing

By using the

if stuff:
    stuff.run()

idiom, you avoid the last issue and keep it simple enough.


> for  big programs, which is better, or any other way?

Define "big", as in scope, LOCs, or number of committers?



From jsanga at cox.net  Tue May  5 06:26:45 2009
From: jsanga at cox.net (mzdude)
Date: Tue, 5 May 2009 03:26:45 -0700 (PDT)
Subject: find sublist inside list
References: <gtmlsk$q51$1@amma.irisa.fr>
	<mailman.5041.1241442097.11746.python-list@python.org> 
	<c8a1e83a-81b9-418c-97e4-e1d6c25c29e4@t11g2000vbc.googlegroups.com> 
	<gtmsf0$se7$1@amma.irisa.fr>
	<b1f47eb5-22a6-491c-b6db-bda94c934b23@l28g2000vba.googlegroups.com>
	<mailman.5071.1241474085.11746.python-list@python.org>
Message-ID: <87859e88-315f-47e3-98b9-338709d4c044@s28g2000vbp.googlegroups.com>

On May 4, 4:54?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Mon, 04 May 2009 15:12:41 -0300, mzdude <jsa... at cox.net> escribi?:
>
> > substring isn't limited to 0..255
> >>>> substring = "\0x%d\0x%d" % (257,257)
> >>>> 'acaccgac'.replace("ac", substring)
> > '\x00x257\x00x257\x00x257\x00x257cg\x00x257\x00x257'
>
> This isn't what you think it is. Look carefully:
>
> py> substring = "\0x%d\0x%d" % (257,257)
> py> len(substring)
> 10
> py> list(substring)
> ['\x00', 'x', '2', '5', '7', '\x00', 'x', '2', '5', '7']
>
> --
> Gabriel Genellina

OOPS. My bad. But I'm not going to give up.

l = ['a','b','c','a','c']
us = unicode("".join(l))
substr = unichr(257) + unichr(257)
us = us.replace(u'ac',substr)
print len(us)
print list(us)


output is
>>>
5
[u'a', u'b', u'c', u'\u0101', u'\u0101']


From aleksandar27 at BRISIOVOnet.hr  Tue May  5 07:21:10 2009
From: aleksandar27 at BRISIOVOnet.hr (alejandro)
Date: Tue, 5 May 2009 13:21:10 +0200
Subject: stuck with PyOBEX
References: <gt78o7$i9n$1@ss408.t-com.hr> <75opebF19fc22U1@mid.uni-berlin.de>
	<gt80qd$mbf$1@get-news01.get.basefarm.net>
	<gt8pbj$j3o$1@ss408.t-com.hr>
	<gtatk5$pff$1@get-news01.get.basefarm.net>
	<gthe40$87q$1@ss408.t-com.hr>
	<gthm2m$sdr$1@get-news01.get.basefarm.net>
	<gtjktg$ai0$1@ss408.t-com.hr>
	<gtkhdr$obj$1@get-news01.get.basefarm.net>
Message-ID: <gtp7fd$cu5$1@ss408.t-com.hr>

Ejla! I have sent you a mail (in case you check it often like me :-))

"David Boddie" <david at boddie.org.uk> wrote in message 
news:gtkhdr$obj$1 at get-news01.get.basefarm.net...
> On Sunday 03 May 2009 10:33, alejandro wrote:
>
>> Yes!
>>
>>> I'll send you an updated version to try if you would like to test it.
>
> My mails to you keep getting returned, so I've put it here:
>
> http://www.boddie.org.uk/david/Projects/Python/PyOBEX/Software/PyOBEX-0.21.zip
>
> Please let me know if it works on Windows, and feel free to get in touch 
> if
> you have any problems.
>
> David 




From ldo at geek-central.gen.new_zealand  Tue May  5 07:28:16 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 05 May 2009 23:28:16 +1200
Subject: exit a program gracefully
References: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
	<50697b2c0905041514t22ac9436td0dbe51e0f22dcfa@mail.gmail.com>
	<mailman.5079.1241476454.11746.python-list@python.org>
Message-ID: <gtp7sg$vbc$1@lust.ihug.co.nz>

In message <mailman.5079.1241476454.11746.python-list at python.org>, Gabriel 
Genellina wrote:

> I prefer to put the code inside a function, and just `return` earlier.

It would be nice if Python offered a straightforward equivalent to

    ... initialization goes here ...
    do /*once*/
      {
        ... do stuff ...
        if (check1_failed)
            break;
        ... do more stuff ...
        if (check2_failed)
            break;
        ... do even more stuff ...
      }
    while (false);
    ... cleanup goes here ...




From cs at zip.com.au  Tue May  5 07:42:00 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Tue, 5 May 2009 21:42:00 +1000
Subject: exit a program gracefully
In-Reply-To: <gtp7sg$vbc$1@lust.ihug.co.nz>
Message-ID: <20090505114200.GA11906@cskk.homeip.net>

On 05May2009 23:28, Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
| In message <mailman.5079.1241476454.11746.python-list at python.org>, Gabriel 
| Genellina wrote:
| 
| > I prefer to put the code inside a function, and just `return` earlier.
| 
| It would be nice if Python offered a straightforward equivalent to
| 
|     ... initialization goes here ...
|     do /*once*/
|       {
|         ... do stuff ...
|         if (check1_failed)
|             break;
|         ... do more stuff ...
|         if (check2_failed)
|             break;
|         ... do even more stuff ...
|       }
|     while (false);
|     ... cleanup goes here ...

  while True:
    ... do stuff ...
    if check1_failed:
      break;
    ... do more stuff ...
    if check2_failed:
      break;
    ... do even more stuff ...
    break
  ... cleanup goes here ...

Seems more straightforward to me!

And there's always try/except and context managers.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

So why can't we celebrate November 5th the way Guy Fawkes would've wanted?
        - Mike Holmes <fofp at tattoo.ed.ac.uk>


From tomanishkb at gmail.com  Tue May  5 08:10:13 2009
From: tomanishkb at gmail.com (M Kumar)
Date: Tue, 5 May 2009 17:40:13 +0530
Subject: help required with pylons
Message-ID: <783b47270905050510y7f899a70s1b79bb3965d44f32@mail.gmail.com>

Hi,

I am having an application server in pylons, which was giving error
sometimes and sometimes it gives the result. I will copy paste the error
below. I am new to pylons and not getting any clue of this kind of behavior.
Please help me what should I do to avoid this kind of errors.

----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 33021)
Traceback (most recent call last):
  File
"/usr/lib/python2.5/site-packages/Paste-1.4.2-py2.5.egg/paste/httpserver.py",
line 1046, in process_request_in_thread
    self.finish_request(request, client_address)
  File "/usr/lib/python2.5/SocketServer.py", line 254, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/lib/python2.5/SocketServer.py", line 522, in __init__
    self.handle()
  File
"/usr/lib/python2.5/site-packages/Paste-1.4.2-py2.5.egg/paste/httpserver.py",
line 425, in handle
    BaseHTTPRequestHandler.handle(self)
  File "/usr/lib/python2.5/BaseHTTPServer.py", line 316, in handle
    self.handle_one_request()
  File
"/usr/lib/python2.5/site-packages/Paste-1.4.2-py2.5.egg/paste/httpserver.py",
line 420, in handle_one_request
    self.wsgi_execute()
  File
"/usr/lib/python2.5/site-packages/Paste-1.4.2-py2.5.egg/paste/httpserver.py",
line 287, in wsgi_execute
    self.wsgi_start_response)
  File
"/usr/lib/python2.5/site-packages/Paste-1.4.2-py2.5.egg/paste/cascade.py",
line 92, in __call__
    return self.apps[-1](environ, start_response)
  File
"/usr/lib/python2.5/site-packages/Paste-1.4.2-py2.5.egg/paste/registry.py",
line 340, in __call__
    app_iter = self.application(environ, start_response)
  File
"/usr/lib/python2.5/site-packages/AuthKit-0.4.0-py2.5.egg/authkit/authenticate/__init__.py",
line 290, in __call__
    return self.app(environ, start_response)
  File
"/usr/lib/python2.5/site-packages/AuthKit-0.4.0-py2.5.egg/authkit/authenticate/cookie.py",
line 354, in __call__
    return self.app(environ, cookie_setting_start_response)
  File
"/usr/lib/python2.5/site-packages/AuthKit-0.4.0-py2.5.egg/authkit/authenticate/multi.py",
line 64, in __call__
    raise Exception('WSGI start_response was not called before a result'
Exception: WSGI start_response was not called before a result was returned
----------------------------------------
thanks in advance
Maneesh KB
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From damienlmoore at gmail.com  Tue May  5 08:18:57 2009
From: damienlmoore at gmail.com (spillz)
Date: Tue, 5 May 2009 05:18:57 -0700 (PDT)
Subject: Problem with case insensitive volumes
References: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
	<mailman.5088.1241498014.11746.python-list@python.org>
Message-ID: <26c57bf5-5ad2-4838-8097-c8d51cf1ccae@n8g2000vbb.googlegroups.com>

> os;walk will tell you the correct case for each node. ? So if it gives
> you a different case than the stored form, you have your answer.

Thanks, although I was hoping that wouldn't be the answer (I have to
compare a LOT of files).


From ganesh.gbg at gmail.com  Tue May  5 08:29:13 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Tue, 5 May 2009 05:29:13 -0700 (PDT)
Subject: problem in using sendmail in multi thread
Message-ID: <343747e9-549f-4336-9b15-522411a785a3@x1g2000prh.googlegroups.com>

hi,
I'm a beginner in using Python script
I'm trying to send mails using multi-thread
I wrote



FROM = 'ganeshxxxx at xxxx.com'
# for more mail add';' the another mail id
listTo = ['g.xxx at gmail.com', 'xxjango.py at gmail.com',
'xxxxx at yahoo.co.in']
SUBJECT = 'This is the subject'
MSGBODY = 'This the body of the message '
MAILSERVER = 'mail.xxxx.com'
port = 25
username = 'xxxxx'
password = 'xxxxx'

# trim the strings of any leading or trailing spaces
FROM = FROM.strip()
SUBJECT = SUBJECT.strip()
MSGBODY = MSGBODY.strip()
MAILSERVER = MAILSERVER.strip()
username = username.strip()
password = password.strip()



#Connect to server
print 'Connecting to mail server ', MAILSERVER
try:
	s = smtplib.SMTP(MAILSERVER,port)
	print 'connected'
#s.set_debuglevel(1)
except:
	 print 'ERROR: Unable to connect to mail server', sys.exc_info	()[0]
	 sys.exit(1)

#login to server
if password <> '':
	print 'Logging into mail server'
try:
	s.login(username,password)
except:
	print 'ERROR: Unable to login to mail server', MAILSERVER
	print 'Please recheck your password'
	sys.exit(1)

#--------------------------------------------------
print "Starting Multi Thread Method"


class MyThread(Thread):

    def __init__(self, site, s, FROM, MSGBODY):
        Thread.__init__(self)
        self.site = site
	self.s=s
	self.FROM=FROM
	self.MSGBODY=MSGBODY

    def run(self):
	print "running for %s " %self.site
	s.sendmail(self.FROM, self.site, self.MSGBODY)
	print "Emailed for  site %s" %self.site



a= time.time()
threads = []

for site in listTo:
    T = MyThread(site,s,FROM,MSGBODY)
    threads.append(T)
    T.start()


for i in threads:
    i.join()
s.quit()
s.close()
print "Took %s seconds" %str(time.time()-a)

#-----------------------------------------------------

Error:
There is no problem with mail ids
I'm using python2.5 ,Ubuntu
I got an error like



Traceback (most recent call last):
  File "/usr/lib/python2.5/threading.py", line 486, in
__bootstrap_inner
    self.run()
  File "threadmailmul.py", line 85, in run
    s.sendmail(self.FROM, self.site, self.MSGBODY)
  File "/usr/lib/python2.5/smtplib.py", line 703, in sendmail
    raise SMTPRecipientsRefused(senderrs)
SMTPRecipientsRefused: {'g.xxx at gmail.com': (503, '5.5.1 Error: nested
MAIL command')}

Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib/python2.5/threading.py", line 486, in
__bootstrap_inner
    self.run()
  File "threadmailmul.py", line 85, in run
    s.sendmail(self.FROM, self.site, self.MSGBODY)
  File "/usr/lib/python2.5/smtplib.py", line 704, in sendmail
    (code,resp) = self.data(msg)
  File "/usr/lib/python2.5/smtplib.py", line 487, in data
    raise SMTPDataError(code,repl)
SMTPDataError: (503, '5.5.1 Error: need MAIL command')

Exception in thread Thread-3:
Traceback (most recent call last):
  File "/usr/lib/python2.5/threading.py", line 486, in
__bootstrap_inner
    self.run()
  File "threadmailmul.py", line 85, in run
    s.sendmail(self.FROM, self.site, self.MSGBODY)
  File "/usr/lib/python2.5/smtplib.py", line 692, in sendmail
    raise SMTPSenderRefused(code, resp, from_addr)
SMTPSenderRefused: (503, '5.5.1 Error: need RCPT command',
'ganeshxxxx at xxx.com')

Exception in thread Thread-4:
Traceback (most recent call last):
  File "/usr/lib/python2.5/threading.py", line 486, in
__bootstrap_inner
    self.run()
  File "threadmailmul.py", line 85, in run
    s.sendmail(self.FROM, self.site, self.MSGBODY)
  File "/usr/lib/python2.5/smtplib.py", line 702, in sendmail
    self.rset()
  File "/usr/lib/python2.5/smtplib.py", line 453, in rset
    return self.docmd("rset")
  File "/usr/lib/python2.5/smtplib.py", line 378, in docmd
    return self.getreply()
  File "/usr/lib/python2.5/smtplib.py", line 355, in getreply
    raise SMTPServerDisconnected("Connection unexpectedly closed")
SMTPServerDisconnected: Connection unexpectedly closed

Traceback (most recent call last):
  File "threadmailmul.py", line 102, in <module>
    i.join()
  File "/usr/lib/python2.5/threading.py", line 594, in join
    self.__block.wait()
  File "/usr/lib/python2.5/threading.py", line 216, in wait
    waiter.acquire()


If someone could point out the (probably silly)
mistake I'm making , I would be very grateful.
Thanks in advance


From kyrie at uh.cu  Tue May  5 08:33:01 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Tue, 5 May 2009 08:33:01 -0400
Subject: Self function
In-Reply-To: <50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com>
Message-ID: <200905050833.01211.kyrie@uh.cu>

On Tuesday 05 May 2009 02:46:58 am Chris Rebert wrote:
> <devils_advocate>
> Adding syntax is EVIL(tm) for it angers the Gods of Backwards
> Compatibility, and this proposal is completely unnecessary because you
> could instead just write:
[...]
> And there would be much clashing with existing variable names,
> for keywords are the Devil's work!
> </devils_advocate>

Heh. I liked the proposal (though I'm not 100% sold on the name __this__), and 
one of the reasons I liked it was... it preempted the name-clashing argument. 
Not a new keyword, just a variable that is injected on the local namespace, 
so it would only clash with code that uses __this__ as a global (or that 
expects to use an unbound __this__).

Btw, is there any way to inject a name into a function's namespace? Following 
the python tradition, maybe we should try to create a more general solution!

K.

(P.S: there is one advantage on having it as a keyword, though: it would make 
static analisis easier)

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From kyrie at uh.cu  Tue May  5 08:44:24 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Tue, 5 May 2009 08:44:24 -0400
Subject: Self function
In-Reply-To: <pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<37e0021f-b50c-4f0c-8ba5-0beed01da029@z16g2000prd.googlegroups.com>
	<pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>
Message-ID: <200905050844.24207.kyrie@uh.cu>

On Tuesday 05 May 2009 03:51:19 am Steven D'Aprano wrote:
> def ivisit(node):
> ? ? print node
> ? ? while node and node.link is not None:
> ? ? ? ? node = node.link
> ? ? ? ? print node
>
> def rvisit(node):
> ? ? print node
> ? ? if node and node.link is not None:
> ? ? ? ? rvisit(node.link)
>
>
> If there are programmers who find rvisit "a lot less readable" than
> ivisit, then in my arrogant opinion they should consider a change of
> profession.

/me smiles.

What if I happen to find rvisit _more_ readable than ivisit?

/me ducks.

[I'm not a lisp user, but I tend to think recursively anyway...]

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From kyrie at uh.cu  Tue May  5 08:57:17 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Tue, 5 May 2009 08:57:17 -0400
Subject: Self function
In-Reply-To: <5a8c7e8b-8b3d-4a47-9ac6-23bc85b512f4@d7g2000prl.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>
	<5a8c7e8b-8b3d-4a47-9ac6-23bc85b512f4@d7g2000prl.googlegroups.com>
Message-ID: <200905050857.17904.kyrie@uh.cu>

On Tuesday 05 May 2009 04:25:49 am Carl Banks wrote:
> Iteration should be used instead of recursion anywhere a tail-
> recursive algorithm is possible. ?Recursion should be used only when
> tail-recursion is not possible.

Why?
Is it because most languages suck at recursion (specially python, as this 
thread shows)? If that's the reason, I think you have it backwards... Turning 
a tail-recursion into an iteration should be the compiler's job, not mine.

An algorithm, any algorithm, should be written in the way that is easier to 
read, unless the language wont allow that easier implementation to be 
efficient enough.

Programming languages suck, but that shouldn't mean that we can't hope to 
improve them.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From henning.vonbargen at arcor.de  Tue May  5 09:16:38 2009
From: henning.vonbargen at arcor.de (henning.vonbargen at arcor.de)
Date: Tue, 5 May 2009 06:16:38 -0700 (PDT)
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
Message-ID: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>

Our program that makes use of cx_Oracle and multi-threading (and works
fine on Windows, Linux and other platforms, including HP-UX PA-RISC),
fails to run on HP-UX Itanium.
When trying to start the first daemon thread, the program raises an
exception:
...
  File "/usr/local/lib/python2.6/threading.py", line 471, in start
    _start_new_thread(self.__bootstrap, ())
error: can't start new thread

I guess there's something wrong with the way we built Python, but I
have absolutely no clue what (I'm not too familiar with HP-UX).
>From what I found in the internet, it's probably something about the
threading libraries at the C level.

So the question is:
Which steps are necessary to build Python 2.6.2 (32bit or 64bit) on HP-
UX Itanium 11.31 with working multi-threading support?

Note:
For whatever reasons, in order to get cx_Oracle 5.0.1 to work on HP-
UX, I have to build it as a built-in module. That's why I have to
build Python myself (and unfortunately there's no Python 2.6.2 binary
distribution for HP-UX itanium available). Everything works fine
except multi-threading.

Before running configure and make, I set up the environment like this:
export PATH=$PATH:/usr/local/bin
export CPPFLAGS=-I/opt/openssl/0.9.8/include
export LDFLAGS="-L/usr/lib/hpux32 -L/usr/local/lib/hpux32 -L/opt/
openssl/0.9.8/lib"

I have the files generated by configure and make available, but it's
too much to post it all, as as I don't know what is relevant and what
not.
So, here's just the first few lines of the config.log output:

This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

It was created by python configure 2.6, which was
generated by GNU Autoconf 2.61.  Invocation command line was

  $ ./configure --with-zlib --with-openssl

## --------- ##
## Platform. ##
## --------- ##

hostname = polref4
uname -m = ia64
uname -r = B.11.31
uname -s = HP-UX
uname -v = U


From anthra.norell at bluewin.ch  Tue May  5 09:21:48 2009
From: anthra.norell at bluewin.ch (Anthra Norell)
Date: Tue, 05 May 2009 15:21:48 +0200
Subject: change some lines from a read file
In-Reply-To: <9cf75556-a58c-4079-b457-da88b0370a1d@s16g2000vbp.googlegroups.com>
References: <0e624af8-d84c-4117-ac93-0cc4a4df4d02@s20g2000vbp.googlegroups.com>	<mailman.5061.1241467868.11746.python-list@python.org>
	<9cf75556-a58c-4079-b457-da88b0370a1d@s16g2000vbp.googlegroups.com>
Message-ID: <4A003D6C.1090104@bluewin.ch>

utab wrote:
> On May 4, 10:06 pm, Anthra Norell <anthra.nor... at bluewin.ch> wrote:
>   
>> utab wrote:
>>     
>>> Dear all,
>>>       
>>> I have to change some lines from a template file, which is rather long
>>> to paste here, but I would like to make some parts of some lines
>>> optional with my command line arguments but I could not see this
>>> directly, I can count the line numbers and decide on this basis to
>>> decide the lines to be configured to my will.
>>>       
>>> More specifically, say, I have a that file includes
>>>       
>>> this is an example python file to play around
>>> .
>>> .
>>> .
>>> some lines
>>> .
>>> .
>>> .
>>> . -> an option line for example.
>>> .
>>> .
>>> .
>>> -> another option line so on.
>>>       
>>> and execute the script
>>> ./myScript option1 option2
>>>       
>>> so that the options at correct locations will be written.
>>>       
>>> Any other options for this simple job that i can improve my Python a
>>> bit as well.
>>>       
>>> Best,
>>> Umut
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>       
>> Your description is not explicit enough to convey your intention. If
>> your template file is too long to post, post a short representative
>> section, an input data sample and a hand-edited sample of the output
>> data you want to generate. You will get more and better advice. .
>>
>> Frederic
>>     
>
> Thanks here is a  sample Session file from a commercial finite element
> pre-post processor PATRAN, the file longer but the ideas are the same
> so that let me give an example, say I would like to make write line 10
> composed of some command line arguments: path+database_name, Also
> there are some lines similar to this in the below sections of the
> file. I am doing it with a if-elif-else clause checking the line
> numbers with which I thought of there should be a better way and ended
> up asking...
>
>      1 $# Session file patran.ses.02 started recording at 05-May-09
> 11:12:25
>      2 $# Build: 15.0.038 Mon Aug 20 21:31:45 PDT 2007
>      3 $# Recorded by: Patran 2007 r1b
>      4 $# FLEXlm initialization complete.  Acquiring license(s)...
>      5 $# License File: /opt/patran-2007r1b/license.dat
>      6 $# Patran 2007 r1b has obtained 1 concurrent license(s) from
> FLEXlm per a
>      7 $# request to execute on Linux node hpc06(001e4f20c494) (Linux
>      8 $# 2.6.23.15-80.fc7) at 05-May-09 11:12:25.
>      9 uil_file_new.go( "/opt/patran-2007r1b/template.db",  @
>     10 "/home/utabak/PATRAN/cavityModels/fromGmsh.db" )
>   
Okay! Please clarify:
Question 1: Is it always line 10 or is it always a path-file-name, which 
could be on another line?
Question 2: Are there other lines you want to translate? If yes, how do 
you identify them? By line number or by content?
Question 3: If you identify your target by content, what ist the 
distinctive feature which it doesn't share with non-target lines? (e.g. 
Path-file name format and nothing else)
Question 4: Do you want to substitute the path name with another path 
name and the file name with another file name, both of which you supply 
on the command line?
Question 5: If your input has a number of different names, do you want 
to translate them all to the same name, in which case you'd only have to 
supply a single pair of names on the command line?
Question 6: If your input has a number of different names and your 
translation also consists of a number of path-file-name pairs, how do 
the targets and substitutes correlate? Sequentially? By pattern?
Question 7: Can you estimate how many different path-file-names your 
complete session file contains? And how many different substitutes you 
may have in extreme cases?
>     11 $# Question from application FILE
>     12 $#     Database /home/utabak/PATRAN/cavityModels/fromGmsh.db
> already exists.
>     13 $# Do you wish to delete the existing database and create a new
> one ?
>     14 $? YES 36000002
>     15 $# Copying /opt/patran-2007r1b/template.db to
>   
Question 8: Here you have a file name. What do you do with it?
>     16 $# /home/utabak/PATRAN/cavityModels/fromGmsh.db
>   
Question 9: Here line 10 repeats. What do you do with it?
>     17 $# Template copy complete.
>     18 $# Database version 3.8 created by Patran 2007 r1b successfully
> opened.
>     19 ga_viewport_size_set( "default_viewport", 14.571214, 7.509466,
> 1 )
>     20 ga_viewport_location_set( "default_viewport", 0.000000,
> 1.088771, 1 )
>     21 $# Creating journal file /home/utabak/PATRAN/cavityModels/
> fromGmsh.db.jou at
>   
Question 10: Here the file name of line 10 repeats. What do you do?
>     22 $# 05-May-09 11:12:43
>     23 nastran_input_import( "/home/utabak/PATRAN/cavityModels/
> toPatran.bdf",  @
>   
Question 11: Here the file name of line 10 repeats. What do you do?

>     24 "default_group", 10, [TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE,
> TRUE, FALSE,  @
>     25 TRUE], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0,
> 0, 0], [ @
>     26 -2000000000, -2000000000, -2000000000, -2000000000,
> -2000000000, -2000000000,  @
>     27 -2000000000, -2000000000, 0, 0] )
>     28 $# Reading of MSC.Nastran input file completed.
>     29 ui_exec_function( "mesh_seed_display_mgr", "init" )
>
> Best,
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   

Frederic



From arnodel at googlemail.com  Tue May  5 09:30:01 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 5 May 2009 06:30:01 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com> 
	<mailman.5100.1241526783.11746.python-list@python.org>
Message-ID: <565698f7-d95b-4b99-95a5-5de68d983400@q2g2000vbr.googlegroups.com>

On 5 May, 13:33, Luis Zarrabeitia <ky... at uh.cu> wrote:
> On Tuesday 05 May 2009 02:46:58 am Chris Rebert wrote:
>
> > <devils_advocate>
> > Adding syntax is EVIL(tm) for it angers the Gods of Backwards
> > Compatibility, and this proposal is completely unnecessary because you
> > could instead just write:
> [...]
> > And there would be much clashing with existing variable names,
> > for keywords are the Devil's work!
> > </devils_advocate>
>
> Heh. I liked the proposal (though I'm not 100% sold on the name __this__), and
> one of the reasons I liked it was... it preempted the name-clashing argument.
> Not a new keyword, just a variable that is injected on the local namespace,
> so it would only clash with code that uses __this__ as a global (or that
> expects to use an unbound __this__).

One issue with automatically binding a local variable to the current
function is with nested functions:

def foo()
    def bar():
       # How do I call foo() from here?

One solution would be

def foo()
    def bar(foo=__this__):
        foo()

I don't know, it does not convince me ATM.

--
Arnaud


From nickgaens at gmail.com  Tue May  5 09:45:25 2009
From: nickgaens at gmail.com (nickgaens at gmail.com)
Date: Tue, 5 May 2009 06:45:25 -0700 (PDT)
Subject: Open a dialog from MainWindow - pyQT4 - Beginner :-)
References: <gtn8q6$e55$1@news-cedar.fernuni-hagen.de>
Message-ID: <55a5a393-f204-4bcb-a010-424bd4ddf063@o30g2000vbc.googlegroups.com>

On May 4, 7:31?pm, Florian Wollenschein <Florian.Wollensch... at FernUni-
Hagen.de> wrote:
> Dear folks,
>
> I'm just working on a pyQT4 version of my txt to html converter thc (see
> listick.org for details).
>
> I created the MainWindow with QT Designer and then converted it to .py
> with pyuic4. It works well so far. Then I created a new UI for my
> abtDialog (about dialog for my application). I did the same as with the
> MainWindow, so I have two UIs and two *_ui.py files now. How can I open
> the dialog from my main application class?
>
> Here's part of the code I'm using:
>
> ...
> self.connect(self.actionAbout,
> ? ? ? ? ? ? ? ? ?QtCore.SIGNAL("triggered()"), self.OpenAbout)
> ...
> ? def OpenAbout(self):
> ? ? ? ? ?pass
> ...
>
> The OpenAbout function should open the dialog. I've already tried a
> abtDialog.show() after creating it via abtDialog = ThcAboutDialog()
> (ThcAboutDialog is the class for this dlg).
>
> Any ideas?
>
> Thanks,
> Listick Lorchhttp://www.listick.org
>
> PS: Keep in mind that I'm quite a beginner in the field of python and qt...

def OpenAbout(self):
    # don't forget to connect the "Ok"-button of this about-dialog to
QDialog::accept() ;-)
    abtDialog.setAttribute(QtCore.Qt.WA_DeleteOnClose)
    abtDialog.exec_()

R3

ps: you could take a look at a QMessageBox::information or so to make
this more "simple"


From Scott.Daniels at Acm.Org  Tue May  5 09:47:03 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 05 May 2009 06:47:03 -0700
Subject: exit a program gracefully
In-Reply-To: <gtp7sg$vbc$1@lust.ihug.co.nz>
References: <OFAC808D3D.30FA799F-ON882575AC.0077FE19-882575AC.00790DAA@seagate.com>
	<50697b2c0905041514t22ac9436td0dbe51e0f22dcfa@mail.gmail.com>
	<mailman.5079.1241476454.11746.python-list@python.org>
	<gtp7sg$vbc$1@lust.ihug.co.nz>
Message-ID: <YMednZ86zo22353XnZ2dnUVZ_rSdnZ2d@pdx.net>

Lawrence D'Oliveiro wrote:
> It would be nice if Python offered a straightforward equivalent to
>     ...
>     do /*once*/
>       {
>         ... do stuff ...
>         if (check1_failed)
>             break;
>         ... do even more stuff ...
>       }
>     while (false);
>     ... cleanup goes here ...

What's wrong with:

     for _ in (None,):
         ... do stuff ...
         if (check1_failed)
             break;
         ... do even more stuff ...
     ... cleanup ...

--Scott David Daniels
Scott.Daniels at Acm.Org


From Scott.Daniels at Acm.Org  Tue May  5 10:02:32 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 05 May 2009 07:02:32 -0700
Subject: Problem with case insensitive volumes
In-Reply-To: <26c57bf5-5ad2-4838-8097-c8d51cf1ccae@n8g2000vbb.googlegroups.com>
References: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
	<mailman.5088.1241498014.11746.python-list@python.org>
	<26c57bf5-5ad2-4838-8097-c8d51cf1ccae@n8g2000vbb.googlegroups.com>
Message-ID: <b4adnUex6-RR2J3XnZ2dnUVZ_t2dnZ2d@pdx.net>

spillz wrote:
>> os;walk will tell you the correct case for each node.   So if it gives
>> you a different case than the stored form, you have your answer.
> 
> Thanks, although I was hoping that wouldn't be the answer (I have to
> compare a LOT of files).
What is so tough about something like:

base, dirs, files = next(os.walk(dirn))  # older: os.walk(dirn).next()
current = dict((name.upper() for name in dirs + files)
...
changed = some_name == current[some_name.upper()]
...

--Scott David Daniels
Scott.Daniels at Acm.Org


From python-url at phaseit.net  Tue May  5 10:15:21 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Tue, 5 May 2009 14:15:21 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (May  5)
Message-ID: <gtphlp$hor$1@lairds.us>

QOTW:  "... [S]omebody's gotta put up some resistance to cute shortcuts, or
we'll find ourselves back with Perl." - Peter Pearson
    http://groups.google.com/group/comp.lang.python/msg/2ce1b43e4d40528f


    How much memory occupies an object?
        http://groups.google.com/group/comp.lang.python/t/e0581c6c80e813aa/

    Get the item actually contained in a set:
        http://groups.google.com/group/comp.lang.python/t/a2ab7d3ffc28e1b1/

    Manipulating individual bits in a long bit string
        http://groups.google.com/group/comp.lang.python/t/471162166df52100/

    A "float" version of range() -like range(-10.5,10.5,0.1)- isn't trivial
    to implement:
        http://groups.google.com/group/comp.lang.python/t/70bdf77282b63944/

    How can a function refer to itself?
        http://groups.google.com/group/comp.lang.python/t/d265da85d4b70eaf/

    Why do all objects have an implicit boolean value?
        http://groups.google.com/group/comp.lang.python/t/1167f4f275a9a64c/

    multiprocessing: How to notify other processes that there is no more
    work to do:
        http://groups.google.com/group/comp.lang.python/t/8c57b2796cae95ff/

    bearophile kindly shares some of his itertools enhancements:
        http://groups.google.com/group/comp.lang.python/t/642e3d4dc3e04a46/

    A package/module/class confusion -- also: how to organize a package
    containing hundreds of classes
        http://groups.google.com/group/comp.lang.python/t/c216908a72d4fb8c/

    Python lists aren't linked lists, as Lisp programmers are used to:
        http://groups.google.com/group/comp.lang.python/t/a0ce55f3d1fbe25/

    And the Lisp mentality is very different :)
        http://groups.google.com/group/comp.lang.python/t/68bf9c5bae807545/

    Passing a method as an argument from within the same class:
        http://groups.google.com/group/comp.lang.python/t/dabfc9f5443b7892/

    Handling large arrays that barely fit in the address space:
        http://groups.google.com/group/comp.lang.python/t/7f065dac609436ea/
    

========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiats":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.
	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    Enjoy the *Python Magazine*.
	http://pymag.phparch.com/

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
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  http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes

There is *not* an RSS for "Python-URL!"--at least not yet.  Arguments
for and against are occasionally entertained.


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E-mail to <Python-URL at phaseit.net> should get through.

To receive a new issue of this posting in e-mail each Monday morning
(approximately), ask <claird at phaseit.net> to subscribe.  Mention
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sponsor the "Python-URL!" project.  Watch this space for upcoming
news about posting archives.


From sion at viridian.paintbox  Tue May  5 10:43:07 2009
From: sion at viridian.paintbox (Sion Arrowsmith)
Date: Tue, 05 May 2009 14:43:07 GMT
Subject: object query assigned variable name?
References: <a168785b-aa87-446a-bd1e-9a58c301890b@y33g2000prg.googlegroups.com>
	<mailman.4961.1241238141.11746.python-list@python.org>
Message-ID: <%fYLl.34150$Sp3.23473@newsfe25.ams2>

John O'Hagan  <research at johnohagan.com> wrote:
>I can see that it's tantalizing, though, because _somebody_ must know about 
>the assignment; after all, we just executed it!

Except we haven't, if we're talking about reporting from the
object's __init__:

>>> class Brian:
...     def __init__(self):
...         print "I'm Brian!"
...
>>> l = []
>>> l[1] = Brian()
I'm Brian!
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list assignment index out of range

(Yeah, I know that's a setitem call not an assignment. Point stands.
It also demonstrates why the whole idea of "what name is a newly-
created object assigned to" is broken.)

-- 
\S

   under construction



From ross.jett at gmail.com  Tue May  5 10:49:24 2009
From: ross.jett at gmail.com (Ross)
Date: Tue, 5 May 2009 07:49:24 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com>
Message-ID: <fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>

On May 5, 12:32?am, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 5, 1:12?am, John Yeung <gallium.arsen... at gmail.com> wrote:
>
> > [...] the problem may require bigger guns (either much better
> > math or much more sophisticated programming).
>
> Yes, I'm responding to myself.
>
> Well, I went ahead with the approach I mentioned earlier, generating
> all possible matches and then selecting among them as needed to fill
> up the courts, trying to keep the number of matches played by each
> player as fair as possible. ?(I should mention that this, or something
> similar, was suggested earlier by someone else in a different thread,
> in response to the same question by the same OP.)
>
> I did use "bigger guns" (mainly a class for player objects, with
> custom __cmp__ method), but still didn't do anything with doubles.
>
> I haven't tested it much, but I'll post it if anyone's interested.
> (That way people can pick on me instead of the OP. ;)
>
> John

I'm interested to see what you did. From your description, it sounds
like I've tried what you've done, but when I implemented my version,
it took minutes to evaluate for bigger numbers. If that isn't the case
with yours, I'd be interested in seeing your implementation.


From sion at viridian.paintbox  Tue May  5 11:09:48 2009
From: sion at viridian.paintbox (Sion Arrowsmith)
Date: Tue, 05 May 2009 15:09:48 GMT
Subject: for with decimal values?
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
	<mailman.5018.1241395534.11746.python-list@python.org>
Message-ID: <0FYLl.34151$Sp3.6719@newsfe25.ams2>

Gabriel Genellina <gagsl-py2 at yahoo.com.ar> wrote:
>En Sun, 03 May 2009 17:41:49 -0300, Zentrader <zentraders at gmail.com>  
>escribi?:
>> There is no need for a function or a generator.  A for() loop is a
>> unique case of a while loop
>> ## for i in range(-10.5, 10.5, 0.1):
>> ctr = -10.5
>> while ctr < 10.5:
>>    print ctr
>>    ctr += 0.1
>
>Isn't so easy. You have representation errors and rounding errors here,  
>and they accumulate. [ ... ]

And remarkably quickly at that:

>>> ctr = -10.5
>>> for i in range(-105, 106):
...     i *= 0.1
...     if i != ctr: print repr(i), repr(ctr)
...     ctr += 0.1
...
-10.0 -10.000000000000002
etc.

-- 
\S

   under construction



From ricaraoz at gmail.com  Tue May  5 11:12:23 2009
From: ricaraoz at gmail.com (=?ISO-8859-1?Q?Ricardo_Ar=E1oz?=)
Date: Tue, 05 May 2009 12:12:23 -0300
Subject: yet another list comprehension question
In-Reply-To: <f0b70e0d-31c2-4d95-bec4-0e57e5d3a860@o14g2000vbo.googlegroups.com>
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>	<gtm1ik$19tj$1@adenine.netfront.net>	<mailman.5039.1241439352.11746.python-list@python.org>
	<f0b70e0d-31c2-4d95-bec4-0e57e5d3a860@o14g2000vbo.googlegroups.com>
Message-ID: <4A005757.7050405@gmail.com>

namekuseijin wrote:
> On May 4, 9:15 am, David Robinow <drobi... at gmail.com> wrote:
>   
>> On Mon, May 4, 2009 at 2:33 AM, namekuseijin
>>
>> <namekuseijin.nos... at gmail.com> wrote:
>>     
>>>>>> ls = [(1,2), (3,4), (5, None), (6,7), (8, None)]
>>>>>> [(x,y) for (x,y) in ls if y]
>>>>>>             
>>> [(1, 2), (3, 4), (6, 7)]
>>>       
>> Nope. That filters out 0 as well as None. Not what the OP asked for.
>>     
>
> True.  I'm still a C programmer at heart I guess.  ah, the flexibility
> of 0... ;)
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   
This seems to work for any length tuples :

>>> a = [(1,2), (3,4, 'goes'), (5,None), (6,7, 8, 'as', None), (8,
None), (9, 0)]
>>> [tup for tup in a if not [e for e in tup if e == None]]
[(1, 2), (3, 4, 'goes'), (9, 0)]


-------------- next part --------------
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From Florian.Wollenschein at FernUni-Hagen.de  Tue May  5 11:43:09 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Tue, 05 May 2009 17:43:09 +0200
Subject: Open a dialog from MainWindow - pyQT4 - Beginner :-)
In-Reply-To: <55a5a393-f204-4bcb-a010-424bd4ddf063@o30g2000vbc.googlegroups.com>
References: <gtn8q6$e55$1@news-cedar.fernuni-hagen.de>
	<55a5a393-f204-4bcb-a010-424bd4ddf063@o30g2000vbc.googlegroups.com>
Message-ID: <gtpmqd$c4i$1@news-cedar.fernuni-hagen.de>

nickgaens at gmail.com wrote:
> On May 4, 7:31 pm, Florian Wollenschein <Florian.Wollensch... at FernUni-
> Hagen.de> wrote:
>> Dear folks,
>>
>> I'm just working on a pyQT4 version of my txt to html converter thc (see
>> listick.org for details).
>>
>> I created the MainWindow with QT Designer and then converted it to .py
>> with pyuic4. It works well so far. Then I created a new UI for my
>> abtDialog (about dialog for my application). I did the same as with the
>> MainWindow, so I have two UIs and two *_ui.py files now. How can I open
>> the dialog from my main application class?
>>
>> Here's part of the code I'm using:
>>
>> ...
>> self.connect(self.actionAbout,
>>                  QtCore.SIGNAL("triggered()"), self.OpenAbout)
>> ...
>>   def OpenAbout(self):
>>          pass
>> ...
>>
>> The OpenAbout function should open the dialog. I've already tried a
>> abtDialog.show() after creating it via abtDialog = ThcAboutDialog()
>> (ThcAboutDialog is the class for this dlg).
>>
>> Any ideas?
>>
>> Thanks,
>> Listick Lorchhttp://www.listick.org
>>
>> PS: Keep in mind that I'm quite a beginner in the field of python and qt...
> 
> def OpenAbout(self):
>     # don't forget to connect the "Ok"-button of this about-dialog to
> QDialog::accept() ;-)
>     abtDialog.setAttribute(QtCore.Qt.WA_DeleteOnClose)
>     abtDialog.exec_()
> 
> R3
> 
> ps: you could take a look at a QMessageBox::information or so to make
> this more "simple"

Wow, thanks for your help. Now it's working :-)

Great.
Regards,
Listick


From georgeoliverGO at gmail.com  Tue May  5 11:52:39 2009
From: georgeoliverGO at gmail.com (George Oliver)
Date: Tue, 5 May 2009 08:52:39 -0700 (PDT)
Subject: call function of class instance with no assigned name?
Message-ID: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>

hi, I'm a Python beginner with a basic question. I'm writing a game
where I have keyboard input handling defined in one class, and command
execution defined in another class. The keyboard handler class
contains a dictionary that maps a key to a command string (like 'h':
'left') and the command handler class contains functions that do the
commands (like def do_right(self):),

I create instances of these classes in a list attached to a third,
'brain' class. What I'd like to have happen is when the player presses
a key, the command string is passed to the command handler, which runs
the function. However I can't figure out a good way to make this
happen.

I've tried a dictionary mapping command strings to functions in the
command handler class, but those dictionary values are evaluated just
once when the class is instantiated. I can create a dictionary in a
separate function in the command handler (like a do_command function)
but creating what could be a big dictionary for each input seems kind
of silly (unless I'm misunderstanding something there).

What would be a good way to make this happen, or is there a different
kind of architecture I should be thinking of?


From damienlmoore at gmail.com  Tue May  5 11:55:13 2009
From: damienlmoore at gmail.com (spillz)
Date: Tue, 5 May 2009 08:55:13 -0700 (PDT)
Subject: Problem with case insensitive volumes
References: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
	<mailman.5088.1241498014.11746.python-list@python.org>
	<26c57bf5-5ad2-4838-8097-c8d51cf1ccae@n8g2000vbb.googlegroups.com>
	<b4adnUex6-RR2J3XnZ2dnUVZ_t2dnZ2d@pdx.net>
Message-ID: <b5d10d01-0f56-4df9-9e4e-99a93a0e0a0f@s31g2000vbp.googlegroups.com>

On May 5, 10:02?am, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> What is so tough about something like:
>
> base, dirs, files = next(os.walk(dirn)) ?# older: os.walk(dirn).next()
> current = dict((name.upper() for name in dirs + files)
> ...
> changed = some_name == current[some_name.upper()]
> ...

not so fast. :) Consider:

/my/path/to/usbkey/and/file

everything up to "/my/path/to/usbkey" is case sensitive. only the "and/
file" is case insensitive. but my list of stored paths might include
all images under "/my". thus

/my/path/to/usbkey/and/file1==/my/path/to/usbkey/and/FILE1
/my/path/to/usbkey/and/file1==/my/path/to/usbkey/AND/FILE1
but
/my/path/to/usbkey/and/file1!=/my/path/TO/usbkey/AND/FILE1

so to do this right I'd need to establish which parts of the path are
case insensitive. being able to retrieve the actual path from an
equivalent representation would be so much simpler.


From clp2 at rebertia.com  Tue May  5 12:01:52 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 5 May 2009 09:01:52 -0700
Subject: call function of class instance with no assigned name?
In-Reply-To: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
Message-ID: <50697b2c0905050901v616d4f6axcdb283eaa2890cc1@mail.gmail.com>

On Tue, May 5, 2009 at 8:52 AM, George Oliver <georgeoliverGO at gmail.com> wrote:
> hi, I'm a Python beginner with a basic question. I'm writing a game
> where I have keyboard input handling defined in one class, and command
> execution defined in another class. The keyboard handler class
> contains a dictionary that maps a key to a command string (like 'h':
> 'left') and the command handler class contains functions that do the
> commands (like def do_right(self):),
>
> I create instances of these classes in a list attached to a third,
> 'brain' class. What I'd like to have happen is when the player presses
> a key, the command string is passed to the command handler, which runs
> the function. However I can't figure out a good way to make this
> happen.
>
> I've tried a dictionary mapping command strings to functions in the
> command handler class, but those dictionary values are evaluated just
> once when the class is instantiated. I can create a dictionary in a
> separate function in the command handler (like a do_command function)
> but creating what could be a big dictionary for each input seems kind
> of silly (unless I'm misunderstanding something there).
>
> What would be a good way to make this happen, or is there a different
> kind of architecture I should be thinking of?

You could exploit Python's dynamism by using the getattr() function:

key2cmd = {'h':'left'}
cmd_name = key2cmd[keystroke]
getattr("do_"+cmd_name, cmd_handler)() #same as cmd_handler.do_left()


Cheers,
Chris
-- 
http://blog.rebertia.com


From aahz at pythoncraft.com  Tue May  5 12:06:59 2009
From: aahz at pythoncraft.com (Aahz)
Date: 5 May 2009 09:06:59 -0700
Subject: problem in using sendmail in multi thread
References: <343747e9-549f-4336-9b15-522411a785a3@x1g2000prh.googlegroups.com>
Message-ID: <gtpo73$g1p$1@panix3.panix.com>

In article <343747e9-549f-4336-9b15-522411a785a3 at x1g2000prh.googlegroups.com>,
gganesh  <ganesh.gbg at gmail.com> wrote:
>
>I'm a beginner in using Python script
>I'm trying to send mails using multi-thread

You need a separate SMTP connection for each thread.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From nickle at gmail.com  Tue May  5 12:07:29 2009
From: nickle at gmail.com (Nick)
Date: Tue, 5 May 2009 09:07:29 -0700 (PDT)
Subject: SQL and CSV
Message-ID: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>

I have a requirement to read a CSV file. Normally, no problem, just
import CSV and slurp the file up.

However, in this case I want to filter out lines that have fields set
to particular values.

It would be neat to be able to do something like this.

select * from test.csv where status <> "Canceled"

Using adodb I can do this, so long as I don't have the where clause. :-
(

Is there a reasonable lightweight way of doing this in Python?

I could write some python code that is used to filter rows, and inport
that from config, but it's not quite as elegant as an SQL route.

Thanks

Nick


From james at agentultra.com  Tue May  5 12:15:15 2009
From: james at agentultra.com (J Kenneth King)
Date: Tue, 05 May 2009 12:15:15 -0400
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
Message-ID: <85ljpb8r1o.fsf@agentultra.com>

Emile van Sebille <emile at fenx.com> writes:

> On 5/1/2009 7:31 AM J Kenneth King said...
>> Chris Rebert <clp2 at rebertia.com> writes:
>>> b = []
>>> for pair in a:
>>>     for item in pair:
>>>         b.append(item)
>>
>> This is much more clear than a nested comprehension.
>>
>> I love comprehensions, but abusing them can lead to really dense and
>> difficult to read code.
>
> I disagree on dense and difficult, although I'll leave open the
> question of abuse.

Dense and difficult may be subjective to people like you or I, but you
left out the "to read" part of that sentence. I was referring to the
negative effect nested or complex list comprehensions can have on
readability.

> b = [ item for pair in a for item in pair ]

It's a clever statement, but use it once and its gone. Why not use the
expanded form in a function definition and get an even shorter, but
clearer statement?

>>> b = flatten(a)

Boom, done.

> This is exactly the code above expressed in comprehension form.
>
> It's worth knowing that a list comprehension is structured identically
> to the equivalent for loop.  So it really is neither more dense nor
> more difficult to read.  Further, you can tell immediately from the
> start of the list comprehension what you've got -- in this case a list
> of item(s).
>
> Here with some slight changes...
>
>>>> a = [(1, 2), (3, 4, 7), (5, 6)]
>>>> [ item for j in a if len(j)==2 for item in j if item % 2 ]
> [1, 5]
>
> ...opposed to...
>
>>>> for j in a:
> ...     if len(j)==2:
> ...         for item in j:
> ...             if item % 2:
> ...                 b.append(item)
> ...
>>>> b
> [1, 5]
>>>>

Thanks for the lesson in list comprehensions, but I'm well aware of
how they work.

List comprehensions can make a reader of your code apprehensive
because it can read like a run-on sentence and thus be difficult to
parse. The Python documentation discourages their use and I believe
for good reason. It's much easier to explain complex processes with a
function rather than a single nested statement.

>
> YMMV,
>
> Emile

It will apparently vary greatly. Depending on how much coffee I've
had.

;)

J


From arnodel at googlemail.com  Tue May  5 12:17:10 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 05 May 2009 17:17:10 +0100
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5107.1241539316.11746.python-list@python.org>
Message-ID: <m2bpq7r0c9.fsf@googlemail.com>

Chris Rebert <clp2 at rebertia.com> writes:

> On Tue, May 5, 2009 at 8:52 AM, George Oliver <georgeoliverGO at gmail.com> wrote:
>> hi, I'm a Python beginner with a basic question. I'm writing a game
>> where I have keyboard input handling defined in one class, and
>> command execution defined in another class. The keyboard handler
>> class contains a dictionary that maps a key to a command string (like
>> 'h': 'left') and the command handler class contains functions that do
>> the commands (like def do_right(self):),
>>
>> I create instances of these classes in a list attached to a third,
>> 'brain' class. What I'd like to have happen is when the player
>> presses a key, the command string is passed to the command handler,
>> which runs the function. However I can't figure out a good way to
>> make this happen.
>>
>> I've tried a dictionary mapping command strings to functions in the
>> command handler class, but those dictionary values are evaluated just
>> once when the class is instantiated. I can create a dictionary in a
>> separate function in the command handler (like a do_command function)
>> but creating what could be a big dictionary for each input seems kind
>> of silly (unless I'm misunderstanding something there).
>>
>> What would be a good way to make this happen, or is there a different
>> kind of architecture I should be thinking of?
>
> You could exploit Python's dynamism by using the getattr() function:
>
> key2cmd = {'h':'left'}
> cmd_name = key2cmd[keystroke]
> getattr("do_"+cmd_name, cmd_handler)() #same as cmd_handler.do_left()

getattr(cmd_handler, "do_" + cmd_name)() will work even better!

-- 
Arnaud


From james at agentultra.com  Tue May  5 12:18:00 2009
From: james at agentultra.com (J Kenneth King)
Date: Tue, 05 May 2009 12:18:00 -0400
Subject: Any idea to emulate tail -f
References: <mailman.5091.1241503147.11746.python-list@python.org>
	<55f6d122-187f-4796-8162-78b066875c4d@q14g2000vbn.googlegroups.com>
Message-ID: <85hbzz8qx3.fsf@agentultra.com>

Iain King <iainking at gmail.com> writes:

> On May 5, 7:00?am, Joel Juvenal Rivera Rivera <joel... at gmail.com>
> wrote:
>> I want to make something very similar to ?the command tail -f (follow a
>> file), i have been trying ?with some while True and some microsleeps
>> (about .1 s); did someone has already done something like this?
>>
>> And about the file is the apache acceslog ?of a site with a lot of
>> traffic.
>>
>> Regards ? ?
>>
>> joe / Joel Rivera
>
> This is very interesting, about using Generator Expressions:
> http://209.85.229.132/search?q=cache:ZHrV4E0eTI8J:www.dabeaz.com/generators/Generators.pdf
>
> Relevant stuff about 'tail -f' is on page 39, but I'd read the whole
> thing if you can.
>
> Iain

+1

I second this suggestion. I've used this method in many scripts of
late and it is quite handy.

He even takes it a little further and shows you some neat things you
can do with it later on.


From mail at timgolden.me.uk  Tue May  5 12:19:32 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 05 May 2009 17:19:32 +0100
Subject: SQL and CSV
In-Reply-To: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
Message-ID: <4A006714.3090601@timgolden.me.uk>

Nick wrote:
> I have a requirement to read a CSV file. Normally, no problem, just
> import CSV and slurp the file up.
> 
> However, in this case I want to filter out lines that have fields set
> to particular values.
> 
> It would be neat to be able to do something like this.
> 
> select * from test.csv where status <> "Canceled"
> 
> Using adodb I can do this, so long as I don't have the where clause. :-
> (
> 
> Is there a reasonable lightweight way of doing this in Python?
> 
> I could write some python code that is used to filter rows, and inport
> that from config, but it's not quite as elegant as an SQL route.


Not entirely clear what you are and aren't prepared to try here, but...
the most obvious Python-based way to do this is treating the csv reader
as an iterator and filtering there. Your last line suggests that's not
what you want but just in case I've misunderstood:

<test.csv>
id,code,status
1,"ONE","Active"
2,"TWO","Cancelled"
3,"THREE","Active"
</test.csv>

<code>
import csv

for row in csv.DictReader (open ("c:/temp/test.csv", "rb")):
  if row['status'] != 'Cancelled':
    print row

</code>

Doesn't seem too onerous, and could obviously be wrapped in
some useful class/module.

But if you really want to go the SQL route, I believe there are
ODBC adapters for CSV which, combined with PyODBC or CeODBC,
would probably take you where you want to go.

TJG


From piet at cs.uu.nl  Tue May  5 12:25:06 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Tue, 05 May 2009 18:25:06 +0200
Subject: problem in using sendmail in multi thread
References: <343747e9-549f-4336-9b15-522411a785a3@x1g2000prh.googlegroups.com>
Message-ID: <m2zldrms9p.fsf@cs.uu.nl>

>>>>> gganesh <ganesh.gbg at gmail.com> (g) wrote:

>g> hi,
>g> I'm a beginner in using Python script
>g> I'm trying to send mails using multi-thread
>g> I wrote



>g> FROM = 'ganeshxxxx at xxxx.com'
>g> # for more mail add';' the another mail id
>g> listTo = ['g.xxx at gmail.com', 'xxjango.py at gmail.com',
>g> 'xxxxx at yahoo.co.in']
>g> SUBJECT = 'This is the subject'
>g> MSGBODY = 'This the body of the message '
>g> MAILSERVER = 'mail.xxxx.com'
>g> port = 25
>g> username = 'xxxxx'
>g> password = 'xxxxx'

>g> # trim the strings of any leading or trailing spaces
>g> FROM = FROM.strip()
>g> SUBJECT = SUBJECT.strip()
>g> MSGBODY = MSGBODY.strip()
>g> MAILSERVER = MAILSERVER.strip()
>g> username = username.strip()
>g> password = password.strip()



>g> #Connect to server
>g> print 'Connecting to mail server ', MAILSERVER
>g> try:
>g> 	s = smtplib.SMTP(MAILSERVER,port)

You can't have a single SMTP connection that's used in multiple threads.
That is what causes the error. Each thread should have its own SMTP
connection. So move this code (above and below) into the run() method.

>g> 	print 'connected'
>g> #s.set_debuglevel(1)
>g> except:
>g> 	 print 'ERROR: Unable to connect to mail server', sys.exc_info	()[0]
>g> 	 sys.exit(1)

>g> #login to server
>g> if password <> '':
>g> 	print 'Logging into mail server'

I think this try except block should be inside the if statement, i.e.
indented 4 spaces.

>g> try:
>g> 	s.login(username,password)
>g> except:
>g> 	print 'ERROR: Unable to login to mail server', MAILSERVER
>g> 	print 'Please recheck your password'
>g> 	sys.exit(1)

>g> #--------------------------------------------------
>g> print "Starting Multi Thread Method"


>g> class MyThread(Thread):

>g>     def __init__(self, site, s, FROM, MSGBODY):
>g>         Thread.__init__(self)
>g>         self.site = site
>g> 	self.s=s
>g> 	self.FROM=FROM
>g> 	self.MSGBODY=MSGBODY

You give the s (connection) here as a parameter, store it in self.s and
never use that attribute.

>g>     def run(self):
>g> 	print "running for %s " %self.site
>g> 	s.sendmail(self.FROM, self.site, self.MSGBODY)

Here you use the global s, not self.s

As I said above you should do the SMTP connection setup, including the
login, here, and store the connection either in self.s or in a local
variable s in the method. As you don't use the s in another method, I
think a local variable is better.

>g> 	print "Emailed for  site %s" %self.site

>g> a= time.time()
>g> threads = []

>g> for site in listTo:
>g>     T = MyThread(site,s,FROM,MSGBODY)
>g>     threads.append(T)
>g>     T.start()

>g> for i in threads:
>g>     i.join()

Of course the next 2 lines should also be moved to run().

>g> s.quit()
>g> s.close()
>g> print "Took %s seconds" %str(time.time()-a)

>g> #-----------------------------------------------------

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From nickle at gmail.com  Tue May  5 12:25:42 2009
From: nickle at gmail.com (Nick)
Date: Tue, 5 May 2009 09:25:42 -0700 (PDT)
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
Message-ID: <1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>

On May 5, 5:19?pm, Tim Golden <m... at timgolden.me.uk> wrote:
> Nick wrote:
> > I have a requirement to read a CSV file. Normally, no problem, just
> > import CSV and slurp the file up.
>
> > However, in this case I want to filter out lines that have fields set
> > to particular values.
>
> > It would be neat to be able to do something like this.
>
> > select * from test.csv where status <> "Canceled"
>
> > Using adodb I can do this, so long as I don't have the where clause. :-
> > (
>
> > Is there a reasonable lightweight way of doing this in Python?
>
> > I could write some python code that is used to filter rows, and inport
> > that from config, but it's not quite as elegant as an SQL route.
>
> Not entirely clear what you are and aren't prepared to try here, but...
> the most obvious Python-based way to do this is treating the csv reader
> as an iterator and filtering there. Your last line suggests that's not
> what you want but just in case I've misunderstood:
>
> <test.csv>
> id,code,status
> 1,"ONE","Active"
> 2,"TWO","Cancelled"
> 3,"THREE","Active"
> </test.csv>
>
> <code>
> import csv
>
> for row in csv.DictReader (open ("c:/temp/test.csv", "rb")):
> ? if row['status'] != 'Cancelled':
> ? ? print row
>
> </code>
>
> Doesn't seem too onerous, and could obviously be wrapped in
> some useful class/module.
>
> But if you really want to go the SQL route, I believe there are
> ODBC adapters for CSV which, combined with PyODBC or CeODBC,
> would probably take you where you want to go.
>
> TJG

Part of the problem is that the 'selection' needs to be in a config
file. I can put the if row['status'] != 'Cancelled': return True into
a config, read it and eval it, but its not quite as clean as an sql
route.

Nick


From Florian.Wollenschein at FernUni-Hagen.de  Tue May  5 12:34:17 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Tue, 05 May 2009 18:34:17 +0200
Subject: thc v0.3 - txt to html converter - better code?
Message-ID: <gtppqc$7v1$1@news-cedar.fernuni-hagen.de>

Hi all,

here's some code of thc, my txt to html converter programmed with Python 
and pyQT4:
-------------------------------------------------------------------------------
if self.rdioBtnTransitional.isChecked():
             if self.cmboBoxLang.currentText() == "English":
                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD 
HTML 4.0 Transitional//EN">' + '\n')
             elif self.cmboBoxLang.currentText() == "German":
                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD 
HTML 4.0 Transitional//DE">' + '\n')
         else:
             file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 
4.0 Strict//EN">' + '\n')
             if self.cmboBoxLang.currentText() == "English":
                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD 
HTML 4.0 Strict//EN">' + '\n')
             elif self.cmboBoxLang.currentText() == "German":
                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD 
HTML 4.0 Strict/DE">' + '\n')
--------------------------------------------------------------------------------

Do you have any ideas for a better code than that? Could this be done 
smarter, shorter, whatever!?

Thanks in advance,
Listick
http://www.listick.org


From silverburgh.meryl at gmail.com  Tue May  5 12:41:42 2009
From: silverburgh.meryl at gmail.com (silverburgh)
Date: Tue, 5 May 2009 09:41:42 -0700 (PDT)
Subject: Error in running python -v on Mac ox 10.5.
Message-ID: <b39ce186-56d3-4dae-84ce-24a7c92bb50a@k9g2000pra.googlegroups.com>


Hi,

I run 'python -v' on Macos 10.5 but I get this error :
# can't create /System/Library/Frameworks/Python.framework/Versions/
2.5/lib/python2.5/encodings/utf_8.pyc

Can you please tell me how to fix it?

And why I am seeing a lot of 'install' message' when i run 'python -
v'? I don't think I see that many
install message on linux.

Here is the full message.  Thanks for any help.

$ python -v
# installing zipimport hook
import zipimport # builtin
# installed zipimport hook
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/site.pyc matches /System/Library/Frameworks/Python.framework/
Versions/2.5/lib/python2.5/site.py
import site # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/site.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/os.pyc matches /System/Library/Frameworks/Python.framework/
Versions/2.5/lib/python2.5/os.py
import os # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/os.pyc
import posix # builtin
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/posixpath.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/posixpath.py
import posixpath # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/posixpath.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/stat.pyc matches /System/Library/Frameworks/Python.framework/
Versions/2.5/lib/python2.5/stat.py
import stat # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/stat.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/UserDict.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/UserDict.py
import UserDict # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/UserDict.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/copy_reg.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/copy_reg.py
import copy_reg # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/copy_reg.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/types.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/types.py
import types # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/types.pyc
import _types # builtin
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/warnings.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/warnings.py
import warnings # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/warnings.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/linecache.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/linecache.py
import linecache # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/linecache.pyc
import encodings # directory /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/encodings
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/encodings/__init__.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/encodings/__init__.py
import encodings # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/encodings/__init__.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/codecs.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/codecs.py
import codecs # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/codecs.pyc
import _codecs # builtin
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/encodings/aliases.pyc matches /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/encodings/aliases.py
import encodings.aliases # precompiled from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/encodings/aliases.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/encodings/utf_8.pyc has bad mtime
import encodings.utf_8 # from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/encodings/utf_8.py
# can't create /System/Library/Frameworks/Python.framework/Versions/
2.5/lib/python2.5/encodings/utf_8.pyc
Python 2.5.1 (r251:54863, Jan 13 2009, 10:26:13)
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
dlopen("/System/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/lib-dynload/readline.so", 2);
import readline # dynamically loaded from /System/Library/Frameworks/
Python.framework/Versions/2.5/lib/python2.5/lib-dynload/readline.so
>>> quit



From paul.sijben at xs4all.nl  Tue May  5 12:43:57 2009
From: paul.sijben at xs4all.nl (Paul Sijben)
Date: Tue, 05 May 2009 18:43:57 +0200
Subject: desperately looking for a howto on running my wxPython app on
	Vista
In-Reply-To: <fb1229dc-1fd9-49c7-8b21-5c4326b53c93@u39g2000pru.googlegroups.com>
References: <49f6d607$0$199$e4fe514c@news.xs4all.nl>
	<mailman.4711.1240940347.11746.python-list@python.org>
	<mailman.4750.1240996642.11746.python-list@python.org>
	<fb1229dc-1fd9-49c7-8b21-5c4326b53c93@u39g2000pru.googlegroups.com>
Message-ID: <4A006CCD.5060901@xs4all.nl>

Mike Driscoll wrote:
> On Apr 29, 4:17 am, Paul Sijben <paul.sij... at xs4all.nl> wrote:

>> Is there any way to check which is the offending pyd/dll?  (normally
>> Vista does not give out much data on what went wrong)
>>
>> Paul
> 
> You might be able to find it using the Dependency Walker utility:
> 
> http://www.dependencywalker.com/

Mike, thanks! That spotted indeed some issues with one specific file:
SHLWAPI.DLL, now let's see what is the issue. The report from Dependency
 Walker:"Warning: At least one module has an unresolved import due to a
missing export function in a delay-load dependent module." is not
telling me much at this moment. The FAQ from Dependency Walker sais this
  is not a major issue, but apparently on Vista it is ?!?

Does anyone have a clue what I am to do about this?

Interestingly On WinXP it flags DWMAPI.DLL as missing. I did not spot
that on the Vista box.

Paul

> 
> - Mike


From emile at fenx.com  Tue May  5 13:11:08 2009
From: emile at fenx.com (Emile van Sebille)
Date: Tue, 05 May 2009 10:11:08 -0700
Subject: list comprehension question
In-Reply-To: <85ljpb8r1o.fsf@agentultra.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>	<85ocucnbce.fsf@agentultra.com>	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
Message-ID: <gtprro$c8m$1@ger.gmane.org>

On 5/5/2009 9:15 AM J Kenneth King said...

> List comprehensions can make a reader of your code apprehensive
> because it can read like a run-on sentence and thus be difficult to
> parse. The Python documentation discourages their use and I believe
> for good reason.

Can you provide a link for this?  I'd like to see specifically what's 
being discouraged, as I'd be surprised to find routine usage frowned upon.

Emile



From jcd at sdf.lonestar.org  Tue May  5 13:11:43 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Tue, 05 May 2009 13:11:43 -0400
Subject: for with decimal values?
In-Reply-To: <e9939643-a961-4a85-9436-2f9e6a1b0fbd@y33g2000prg.googlegroups.com>
References: <mailman.4975.1241277173.11746.python-list@python.org>
	<930f396f-a15e-4dd5-9d11-f6a074d44ffc@z16g2000prd.googlegroups.com>
	<op.utdo7jajx6zn5v@gabriel.sleipnir-bsas>
	<mailman.5022.1241401297.11746.python-list@python.org>
	<e9939643-a961-4a85-9436-2f9e6a1b0fbd@y33g2000prg.googlegroups.com>
Message-ID: <1241543503.6816.9.camel@aalcdl07>

On Sun, 2009-05-03 at 19:48 -0700, alex23 wrote:
> On May 4, 11:41 am, Esmail <ebo... at hotmail.com> wrote:
> > All this discussion makes me wonder if it would be a good idea
> > for Python to have this feature (batteries included and all) - it
> > would have its uses, no?
> 
> Well, sometimes more discussion == less consensus :)
> 
> But it's really easy to roll your own:
> 
> from decimal import Decimal
> 
> def args2dec(fn):
>     '''*args to Decimal decorator'''
>     float2dec = lambda f: Decimal(str(f))
>     def _args2dec(*args):
>         args = map(float2dec, args)
>         return fn(*args)
>     return _args2dec
> 
> @args2dec
> def drange(start, stop, step):
>     while start < stop:
>         yield start
>         start += step

I'd prefer not to force my users into using the Decimal type.  Maybe
float fits their needs better.  So here's a generalized xrange
replacement, which fixes an error in the drange implementation above
(try it with a negative step).  It's also highly *not* optimized.
Calculating i * step every time slows it down.  Speeding it back up is
an exercise for the reader.

def general_xrange(start, stop, step=1):
    target = stop * step
    if start * step > target:
        raise ValueError
    i = start
    while i * step < target:
        yield i
        i += step

Cheers,
Cliff




From georgeoliverGO at gmail.com  Tue May  5 13:28:43 2009
From: georgeoliverGO at gmail.com (George Oliver)
Date: Tue, 5 May 2009 10:28:43 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5107.1241539316.11746.python-list@python.org>
Message-ID: <2af0b836-b3a0-46d5-bf6c-9629614bbccd@d2g2000pra.googlegroups.com>

On May 5, 9:01 am, Chris Rebert <c... at rebertia.com> wrote:
> On Tue, May 5, 2009 at 8:52 AM, George Oliver <georgeolive... at gmail.com> wrote:

> > I create instances of these classes in a list attached to a third,
> > 'brain' class.
>
> You could exploit Python's dynamism by using the getattr() function:


Thanks for the responses -- I should have mentioned that I looked at
the getattr() function, but as I instantiate the key handler and
command handler classes in a list (like handlers = [command_handler(),
keyboard_handler()], I'm unsure how to reference that class instance
in the getattr in a straightforward way (short of keeping track of
each instance's position in the handlers list). Is there a typical way
of doing that?



From google at mrabarnett.plus.com  Tue May  5 13:33:58 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 05 May 2009 18:33:58 +0100
Subject: Code works fine except...
In-Reply-To: <fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>	<mailman.5023.1241407766.11746.python-list@python.org>	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com>
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com>
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com>
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com>
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com>
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com>
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com>
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>
Message-ID: <4A007886.5010703@mrabarnett.plus.com>

Ross wrote:
> On May 5, 12:32 am, John Yeung <gallium.arsen... at gmail.com> wrote:
>> On May 5, 1:12 am, John Yeung <gallium.arsen... at gmail.com> wrote:
>>
>>> [...] the problem may require bigger guns (either much better
>>> math or much more sophisticated programming).
>> Yes, I'm responding to myself.
>>
>> Well, I went ahead with the approach I mentioned earlier, generating
>> all possible matches and then selecting among them as needed to fill
>> up the courts, trying to keep the number of matches played by each
>> player as fair as possible.  (I should mention that this, or something
>> similar, was suggested earlier by someone else in a different thread,
>> in response to the same question by the same OP.)
>>
>> I did use "bigger guns" (mainly a class for player objects, with
>> custom __cmp__ method), but still didn't do anything with doubles.
>>
>> I haven't tested it much, but I'll post it if anyone's interested.
>> (That way people can pick on me instead of the OP. ;)
>>
>> John
> 
> I'm interested to see what you did. From your description, it sounds
> like I've tried what you've done, but when I implemented my version,
> it took minutes to evaluate for bigger numbers. If that isn't the case
> with yours, I'd be interested in seeing your implementation.
> 
Here's my approach (incomplete):

def get_pair(player_list, played):
     for first in range(len(player_list)):
         player_1 = player_list[first]
         for second in range(first + 1, len(player_list)):
             player_2 = player_list[second]
             pair = player_1, player_2
             sorted_pair = tuple(sorted(pair))
             if sorted_pair not in played:
                 played.add(sorted_pair)
                 del player_list[second]
                 del player_list[first]
                 return pair
     return None

def round_robin(player_list, courts, played):
     playing = []
     for c in range(courts):
         pair = get_pair(player_list, played)
         if pair is None:
             break
         playing.append(pair)
     byes = player_list[:]
     player_list[:] = byes + [player for pair in playing for player in pair]
     yield playing, byes

def test_round_robin(players, rounds, courts, doubles=False):
     player_list = range(players)
     played = set()
     for r in range(rounds):
         for playing, byes in round_robin(player_list, courts, played):
             print playing, byes



From minesh at gmail.com  Tue May  5 13:39:59 2009
From: minesh at gmail.com (Minesh Patel)
Date: Tue, 5 May 2009 10:39:59 -0700
Subject: Is there is any way to send messages to chunk of emails ID's 
	concurrently using smptlib
In-Reply-To: <m27i0woa5j.fsf@cs.uu.nl>
References: <17ea2ba6-3f5d-4e7e-b05b-6d91dfbc5b36@k19g2000prh.googlegroups.com>
	<m27i0woa5j.fsf@cs.uu.nl>
Message-ID: <b804d5d90905051039n52001db6j5fd6e2a7aa57abb1@mail.gmail.com>

On Mon, May 4, 2009 at 2:01 PM, Piet van Oostrum <piet at cs.uu.nl> wrote:
>>>>>> gganesh <ganesh.gbg at gmail.com> (g) wrote:
>
>>g> Hi friends,
>>g> I suppose sendmail() can send mails one by one ,how to send mails
>>g> concurrently ,
>>g> It would be very grateful,if someone could point out a solution.
>

You can always use twisted which has an smtp library which is used for
concurrency. Not a complete working example but an understanding of
deferreds is required.

Ex:

from twisted.mail import smtp
from twisted.internet import reactor, defer

  def sendEmail(to, message, subject="Testing",
                 _from='foo at bar.com'):
      """Used to send emails asyncronously to multiple recipients"""
      msg = MIMEText(message)
      msg['Subject'] = subject
      msg['From'] = _from
      msg['To'] = ", ".join(to)

      sending = smtp.sendmail('localhost', _from, to, msg)
      sending.addCallback(sendComplete, to).addErrback(sendFailed)

   def sendFailed(error):
      print "Email failed: %r" % (error.getTraceback(),)

   def sendComplete(result, recipients):
      numDelivered, addrInfo = result
      print addrInfo
      if (numDelivered != len(recipients)):
         log.msg(SmtpError, "Not all recipients received email %r" % addrInfo)

buf = 'TESTING'
sendEmail(to=['to at spam.com'], message=buf)


-- 
Thanks,
./Minesh


From jcd at sdf.lonestar.org  Tue May  5 13:43:32 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Tue, 05 May 2009 13:43:32 -0400
Subject: list comprehension question
In-Reply-To: <49FB2AA7.6020403@snet.net>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>
	<49FB2225.4030601@councilforeconed.org>  <49FB2AA7.6020403@snet.net>
Message-ID: <1241545412.12966.3.camel@aalcdl07>

On Fri, 2009-05-01 at 13:00 -0400, John Posner wrote:
> Shane Geiger wrote:
> >    if type(el) == list or type(el) is tuple:
> A tiny improvement:
> 
>         if type(el) in (list, tuple):
> 

Another alternative, which might be useful in some cases:

          if hasattr(el, '__iter__'):

This covers all iterables, not just lists and tuples.  

So:

>>> flatten([1,2, xrange(3,15), 15, 16])
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]

The downside, of course, is that some iterables might be infinite (such
as count), which would cause hidden breakage.  But if you have one of
those in your data structure, why are you trying to flatten it anyway?


Cheers,
Cliff




From murali.au at gmail.com  Tue May  5 13:43:58 2009
From: murali.au at gmail.com (Murali kumar)
Date: Tue, 5 May 2009 23:13:58 +0530
Subject: help for documentation and license
Message-ID: <e4419f3f0905051043g7dba21e0wc398556db94d346a@mail.gmail.com>

hi all..

I finished my application using python 2.6 and wxpython 2.8.9

>> I want to generate documentation for my application..
      please suggest me and provide links to generate documents in easy
way..

>> I want to host my product as open source.. I'dont know about licensing..
      help me for this also..


Advanced Thanks ..
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From jcd at sdf.lonestar.org  Tue May  5 14:01:02 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Tue, 05 May 2009 14:01:02 -0400
Subject: list comprehension question
In-Reply-To: <85ljpb8r1o.fsf@agentultra.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
Message-ID: <1241546462.12966.20.camel@aalcdl07>

On Tue, 2009-05-05 at 12:15 -0400, J Kenneth King wrote:
> Emile van Sebille <emile at fenx.com> writes:
> 
> > On 5/1/2009 7:31 AM J Kenneth King said...
> >> Chris Rebert <clp2 at rebertia.com> writes:
> >>> b = []
> >>> for pair in a:
> >>>     for item in pair:
> >>>         b.append(item)
> >>
> >> This is much more clear than a nested comprehension.
> >>
> >> I love comprehensions, but abusing them can lead to really dense and
> >> difficult to read code.
> >
> > I disagree on dense and difficult, although I'll leave open the
> > question of abuse.
> 
> Dense and difficult may be subjective to people like you or I, but you
> left out the "to read" part of that sentence. I was referring to the
> negative effect nested or complex list comprehensions can have on
> readability.
> 
> > b = [ item for pair in a for item in pair ]
> 
> It's a clever statement, but use it once and its gone. Why not use the
> expanded form in a function definition and get an even shorter, but
> clearer statement?
> 

It's also not obvious what it means.  I would have thought the proper
incantation would be:

[item for item in pair for pair in a]

but that returns [5,5,5,6,6,6].  I still haven't figured out why.  The
way you have to bounce your eyes back and forth in the comprehension
makes it hard to read the logic.  With the loop, on the other hand it is
blatantly obvious which way the nesting occurs.



>
> >>> b = flatten(a)
> 
> Boom, done.
> 
> > This is exactly the code above expressed in comprehension form.
> >
> > It's worth knowing that a list comprehension is structured identically
> > to the equivalent for loop.  So it really is neither more dense nor
> > more difficult to read.  Further, you can tell immediately from the
> > start of the list comprehension what you've got -- in this case a list
> > of item(s).

Empirically, I'd have to disagree with you.  The structure is changed by
the fact that "item" gets put at the beginning of the comprehension.
With the loop, each variable gets introduced in a for statement, and
then used.  With the list comprehension, "item" gets used at the
beginning, and then assigned to in the for expression at the end.
Meanwhile, pair gets introduced as the loop variable in the first for
expression, and iterated over in the second for expression.  So do you
read it left to right or right to left?  Neither.  You have to hold the
whole expression in your mind at once.  Good for short and simple
comprehensions, bad as they get more complicated.

 
> >
> > Here with some slight changes...
> >
> >>>> a = [(1, 2), (3, 4, 7), (5, 6)]
> >>>> [ item for j in a if len(j)==2 for item in j if item % 2 ]
> > [1, 5]
> >

This, to me, looks like line noise, approaching perl in its
unreadability.


> > ...opposed to...
> >
> >>>> for j in a:
> > ...     if len(j)==2:
> > ...         for item in j:
> > ...             if item % 2:
> > ...                 b.append(item)
> > ...
> >>>> b
> > [1, 5]
> >>>>
> 

Much nicer.  Thank you.

> Thanks for the lesson in list comprehensions, but I'm well aware of
> how they work.
> 
> List comprehensions can make a reader of your code apprehensive
> because it can read like a run-on sentence and thus be difficult to
> parse. The Python documentation discourages their use and I believe
> for good reason. It's much easier to explain complex processes with a
> function rather than a single nested statement.
> 
> >
> > YMMV,
> >
> > Emile
> 
> It will apparently vary greatly. Depending on how much coffee I've
> had.
> 
> ;)
> 
> J
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From mccredie at gmail.com  Tue May  5 14:04:00 2009
From: mccredie at gmail.com (Matimus)
Date: Tue, 5 May 2009 11:04:00 -0700 (PDT)
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
Message-ID: <95543497-5eea-4804-9b41-e6a7e842961f@u9g2000pre.googlegroups.com>

On May 5, 9:25?am, Nick <nic... at gmail.com> wrote:
> On May 5, 5:19?pm, Tim Golden <m... at timgolden.me.uk> wrote:
>
>
>
> > Nick wrote:
> > > I have a requirement to read a CSV file. Normally, no problem, just
> > > import CSV and slurp the file up.
>
> > > However, in this case I want to filter out lines that have fields set
> > > to particular values.
>
> > > It would be neat to be able to do something like this.
>
> > > select * from test.csv where status <> "Canceled"
>
> > > Using adodb I can do this, so long as I don't have the where clause. :-
> > > (
>
> > > Is there a reasonable lightweight way of doing this in Python?
>
> > > I could write some python code that is used to filter rows, and inport
> > > that from config, but it's not quite as elegant as an SQL route.
>
> > Not entirely clear what you are and aren't prepared to try here, but...
> > the most obvious Python-based way to do this is treating the csv reader
> > as an iterator and filtering there. Your last line suggests that's not
> > what you want but just in case I've misunderstood:
>
> > <test.csv>
> > id,code,status
> > 1,"ONE","Active"
> > 2,"TWO","Cancelled"
> > 3,"THREE","Active"
> > </test.csv>
>
> > <code>
> > import csv
>
> > for row in csv.DictReader (open ("c:/temp/test.csv", "rb")):
> > ? if row['status'] != 'Cancelled':
> > ? ? print row
>
> > </code>
>
> > Doesn't seem too onerous, and could obviously be wrapped in
> > some useful class/module.
>
> > But if you really want to go the SQL route, I believe there are
> > ODBC adapters for CSV which, combined with PyODBC or CeODBC,
> > would probably take you where you want to go.
>
> > TJG
>
> Part of the problem is that the 'selection' needs to be in a config
> file. I can put the if row['status'] != 'Cancelled': return True into
> a config, read it and eval it, but its not quite as clean as an sql
> route.
>
> Nick

Well, if you are using 2.5.x you could always stuff it into a sqlite
in-memory database, and then execute a SQL query. Heck, you don't even
_need_ 2.5, but in 2.5 sqlite is part of the distribution.

Matt


From gokhansever at gmail.com  Tue May  5 14:30:22 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Tue, 5 May 2009 13:30:22 -0500
Subject: help for documentation and license
In-Reply-To: <e4419f3f0905051043g7dba21e0wc398556db94d346a@mail.gmail.com>
References: <e4419f3f0905051043g7dba21e0wc398556db94d346a@mail.gmail.com>
Message-ID: <49d6b3500905051130r1e8406fg470c6d584710558a@mail.gmail.com>

Hi,

Even though I don't know what your project does, you will need to use
"Sphinx" to create semi-automatic documentation out of your project.

I would recommend you to take a look a quality "free" Python module:
Matplotlib (http://matplotlib.sourceforge.net/index.html)
Go ahead, and check out the main svn trunk. There you will see all
what you need about documentation creation with Sphinx.

Good luck...

G?khan



On Tue, May 5, 2009 at 12:43 PM, Murali kumar <murali.au at gmail.com> wrote:
> hi all..
>
> I finished my application using python 2.6 and wxpython 2.8.9
>
>>> I want to generate documentation for my application..
> ????? please suggest me and provide links to generate documents in easy
> way..
>
>>> I want to host my product as open source.. I'dont know about licensing..
> ????? help me for this also..
>
>
> Advanced Thanks ..
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From debatem1 at gmail.com  Tue May  5 14:45:34 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 5 May 2009 11:45:34 -0700 (PDT)
Subject: help for documentation and license
References: <e4419f3f0905051043g7dba21e0wc398556db94d346a@mail.gmail.com> 
	<mailman.5116.1241548225.11746.python-list@python.org>
Message-ID: <7b470dd7-ff66-46ba-859f-2a81603ae745@r34g2000vbi.googlegroups.com>

On May 5, 2:30?pm, G?khan SEVER <gokhanse... at gmail.com> wrote:
> Hi,
>
> Even though I don't know what your project does, you will need to use
> "Sphinx" to create semi-automatic documentation out of your project.
>
> I would recommend you to take a look a quality "free" Python module:
> Matplotlib (http://matplotlib.sourceforge.net/index.html)
> Go ahead, and check out the main svn trunk. There you will see all
> what you need about documentation creation with Sphinx.
>
> Good luck...
>
> G?khan
>
> On Tue, May 5, 2009 at 12:43 PM, Murali kumar <murali... at gmail.com> wrote:
> > hi all..
>
> > I finished my application using python 2.6 and wxpython 2.8.9
>
> >>> I want to generate documentation for my application..
> > ????? please suggest me and provide links to generate documents in easy
> > way..
>
> >>> I want to host my product as open source.. I'dont know about licensing..
> > ????? help me for this also..

You can autogenerate API docs using pydoc (builtin, usually ugly) or
epydoc
(external, not so ugly), or you can use a project like sphinx for hand
written docs.

As far as hosting goes, sourceforge is usually the way to go, although
I'm
a huge fan of gitorious (in fact, wrote a recipe to autogenerate API
docs
for markdown <URL: http://code.activestate.com/recipes/576733/>) but
you
have to be using git for it to work. Github is another choice. If
that's
the case.

As far as licensing goes, you have a *LOT* of options, so you may want
to
check out <URL: http://en.wikipedia.org/wiki/Comparison_of_free_software_licenses>

Geremy Condra



From stefan_ml at behnel.de  Tue May  5 14:46:45 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 05 May 2009 20:46:45 +0200
Subject: thc v0.3 - txt to html converter - better code?
In-Reply-To: <gtppqc$7v1$1@news-cedar.fernuni-hagen.de>
References: <gtppqc$7v1$1@news-cedar.fernuni-hagen.de>
Message-ID: <4a008996$0$31862$9b4e6d93@newsspool3.arcor-online.net>

Florian Wollenschein wrote:
> here's some code of thc, my txt to html converter programmed with Python
> and pyQT4:
> -------------------------------------------------------------------------------
> 
> if self.rdioBtnTransitional.isChecked():
>             if self.cmboBoxLang.currentText() == "English":
>                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML
> 4.0 Transitional//EN">' + '\n')
>             elif self.cmboBoxLang.currentText() == "German":
>                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML
> 4.0 Transitional//DE">' + '\n')
>         else:
>             file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0
> Strict//EN">' + '\n')
>             if self.cmboBoxLang.currentText() == "English":
>                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML
> 4.0 Strict//EN">' + '\n')
>             elif self.cmboBoxLang.currentText() == "German":
>                 file_open.write('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML
> 4.0 Strict/DE">' + '\n')
> --------------------------------------------------------------------------------
> 
> 
> Do you have any ideas for a better code than that? Could this be done
> smarter, shorter, whatever!?

I assume you are referring to the code duplication above. You can build the
string incrementally instead, e.g.

    language_map = {'English': 'EN', 'Deutsch': 'DE'}
    strict_or_transitional = {True: 'Transitional', False: 'Strict'}

    # this will raise a KeyError for unknown languages
    language = language_map[ self.cmboBoxLang.currentText() ]

    # this assumes that isChecked() returns True or False
    spec = strict_or_transitional[self.rdioBtnTransitional.isChecked()]

    doctype = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 %s/%s">\n' % (
        spec, language)

Stefan


From kyosohma at gmail.com  Tue May  5 14:57:12 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 5 May 2009 11:57:12 -0700 (PDT)
Subject: desperately looking for a howto on running my wxPython app on 
	Vista
References: <49f6d607$0$199$e4fe514c@news.xs4all.nl>
	<mailman.4711.1240940347.11746.python-list@python.org> 
	<mailman.4750.1240996642.11746.python-list@python.org>
	<fb1229dc-1fd9-49c7-8b21-5c4326b53c93@u39g2000pru.googlegroups.com>
	<4A006CCD.5060901@xs4all.nl>
Message-ID: <1f97707a-9fd8-45d0-8aa6-142ce16b1951@e24g2000vbe.googlegroups.com>

On May 5, 11:43?am, Paul Sijben <paul.sij... at xs4all.nl> wrote:
> Mike Driscoll wrote:
> > On Apr 29, 4:17 am, Paul Sijben <paul.sij... at xs4all.nl> wrote:
> >> Is there any way to check which is the offending pyd/dll? ?(normally
> >> Vista does not give out much data on what went wrong)
>
> >> Paul
>
> > You might be able to find it using the Dependency Walker utility:
>
> >http://www.dependencywalker.com/
>
> Mike, thanks! That spotted indeed some issues with one specific file:
> SHLWAPI.DLL, now let's see what is the issue. The report from Dependency
> ?Walker:"Warning: At least one module has an unresolved import due to a
> missing export function in a delay-load dependent module." is not
> telling me much at this moment. The FAQ from Dependency Walker sais this
> ? is not a major issue, but apparently on Vista it is ?!?
>
> Does anyone have a clue what I am to do about this?
>
> Interestingly On WinXP it flags DWMAPI.DLL as missing. I did not spot
> that on the Vista box.
>
> Paul
>
>
>
> > - Mike

Hmmm...I'm not familiar with that DLL, but a little googling seems to
indicate that you may be able to get it off your installation CD:

http://www.techimo.com/forum/applications-operating-systems/76550-winxp-msgina-dll-shlwapi-dll-problem.html

The link above gives the steps for XP, but Vista will probably be
similar. I don't know for sure, but you may have to register the dll
once you've got it copied back onto your machine.

Mike


From davea at ieee.org  Tue May  5 14:59:21 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 05 May 2009 14:59:21 -0400
Subject: call function of class instance with no assigned name?
In-Reply-To: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
Message-ID: <4A008C89.8090503@ieee.org>

George Oliver wrote:
> hi, I'm a Python beginner with a basic question. I'm writing a game
> where I have keyboard input handling defined in one class, and command
> execution defined in another class. The keyboard handler class
> contains a dictionary that maps a key to a command string (like 'h':
> 'left') and the command handler class contains functions that do the
> commands (like def do_right(self):),
>
> I create instances of these classes in a list attached to a third,
> 'brain' class. What I'd like to have happen is when the player presses
> a key, the command string is passed to the command handler, which runs
> the function. However I can't figure out a good way to make this
> happen.
>
> I've tried a dictionary mapping command strings to functions in the
> command handler class, but those dictionary values are evaluated just
> once when the class is instantiated. I can create a dictionary in a
> separate function in the command handler (like a do_command function)
> but creating what could be a big dictionary for each input seems kind
> of silly (unless I'm misunderstanding something there).
>
> What would be a good way to make this happen, or is there a different
> kind of architecture I should be thinking of?
>
>   
You have lots of words, but no code, and no explanation of why you're 
choosing this "architecture."  So it's unclear just what to propose to 
you, without sticking to generalities.

1) forget about getattr() unless you have hundreds of methods in your 
map.  The real question is why you need two maps. What good is the 
"command string" doing you?   Why not just map the keyvalues directly 
into function objects?

2) Look at the following simple example, where I'm assuming that a 
"keycode" is simply an ASCII character.

class Command(object):
    def __init__(self):
        pass
    def doEnter(self):
        print "Enter is done"
    def doA(self):
        print "A is done"

cmd = Command()



table = {
    13: cmd.doEnter,
    65: cmd.doA
}

print "trying 13"
key = 13
table[key]()
print "trying 65"
key = 65
table[key]()

3) As for rebuilding the dictionary, that just depends on where you 
build it, and what it's lifetime is.  If it's got enough lifetime, and 
appropriate scope, you wouldn't have to rebuild anything.

4) Code up a first try, and when you get stuck, ask a specific question.

You said you're a beginner.  So keep it as simple as possible.l



From http  Tue May  5 15:01:39 2009
From: http (Paul Rubin)
Date: 05 May 2009 12:01:39 -0700
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<202a05cd-3ce4-41fb-943b-5fd3f18d9bbb@z5g2000vba.googlegroups.com>
	<m2ocu8r9bc.fsf@googlemail.com>
	<cee041da-a1e0-4d82-b4ba-5404811d3edd@t10g2000vbg.googlegroups.com>
	<gtngtq$m5l$1@panix3.panix.com>
	<8c18a63a-8ca5-44bd-9b47-c1247a8f1a97@v4g2000vba.googlegroups.com>
	<a7017f70-2f60-4937-b596-943612166723@j9g2000prh.googlegroups.com>
	<pan.2009.05.05.03.22.33@REMOVE.THIS.cybersource.com.au>
	<37e0021f-b50c-4f0c-8ba5-0beed01da029@z16g2000prd.googlegroups.com>
	<pan.2009.05.05.07.51.18@REMOVE.THIS.cybersource.com.au>
Message-ID: <7xhbzzz84s.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
> def rvisit(node):
>     print node
>     if node and node.link is not None:
>         rvisit(node.link)

Less redundant (remember the extra "recursion" doesn't cost anything
if the compiler is sane enough to turn it into a jump):

 def rvisit(node):
     print node
     if node:
         rvisit(node.link)


From chambon.pascal at wanadoo.fr  Tue May  5 15:05:15 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Tue, 05 May 2009 21:05:15 +0200
Subject: Which one is best Python or Java for developing GUI applications?
In-Reply-To: <50697b2c0905050228l5fee0351re35f61f0fe9d35ab@mail.gmail.com>
References: <mailman.5092.1241505670.11746.python-list@python.org>	<7xfxfkvwra.fsf@ruckus.brouhaha.com>
	<87d4ao9fi7.fsf@rudin.co.uk>
	<50697b2c0905050228l5fee0351re35f61f0fe9d35ab@mail.gmail.com>
Message-ID: <4A008DEB.80607@wanadoo.fr>

Chris Rebert a ?crit :
> On Tue, May 5, 2009 at 12:26 AM, Paul Rudin <paul.nospam at rudin.co.uk> wrote:
>   
>> Paul Rubin <http://phr.cx at NOSPAM.invalid> writes:
>>
>>     
>>> srinivasan srinivas <sri_annauni at yahoo.co.in> writes:
>>>       
>>>> Could you tell me does Python have any advantages over Java for the
>>>> development of GUI applications?
>>>>         
>>> Yes.
>>>       
>> Clearly c.l.p needs to adopt the SNB <http://cam.misc.org.uk/snb>
>> convention :)
>>     
>
> Surely you have forgotten the comedy style of the language's namesake,
> which makes that rule completely inadmissible! ;P
>
> Cheers,
> Chris
>   

The fact that Python is a dynamic language offers, in my opinion, a huge 
advantage to quickly setup a GUI, without caring about the infinite 
details of the variable types and function signatures.
Its good handling of "function as first-class objects" is also precious 
when comes the time of setting callbacks (I can't bear anymore the way 
Swing does it, with interfaces etc.)

But much depends on the framework used, too. I've used wxPython for a 
multimedia project, and actually it lacked a lot of necessary features 
(transparency, event loop tuning, multithreading support...), but that 
was 1 year ago, maybe things have changed.
Anyway, I'd advocate the use of PyQt, which really offers tremendous 
possibilities - if your application isn't a simple office application, 
its' really worth turning towards pyqt.

Regards,
Pascal
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From a.cavallo at cavallinux.eu  Tue May  5 15:06:17 2009
From: a.cavallo at cavallinux.eu (A. Cavallo)
Date: Tue, 5 May 2009 20:06:17 +0100
Subject: Numpy on python 2.7a
Message-ID: <200905052006.17708.a.cavallo@cavallinux.eu>

Hi,

I'm trying to compile numpy using my own pet project based on the python svn 
code (that's the reason for the 2.7a tag).

It is essentially a /opt python installation and it tailored for linux: its 
main goal is to be installed in parallel so it won't collide with a system 
installed python (this won't impact the sys admin work).

The rpms built so far can be found under:

http://download.opensuse.org/repositories/home:/cavallo71:/python-opt/

It includes several patches both stolen from other sources, some made by 
myself (at some point I plan to do the same for debian based distributions 
when I'll have some spare time) and it contains a smoke test to verify the 
build is ok.

The user willing to activate the "opt-python" has to just source the 
file /opt/opt-python-2.7a0/opt-python-env.sh and he/she will have a fully 
working python (in this way there could be several different python version 
at the same time).

So far so good, I've been able to compile the python imaging library, but it 
fails to compile numpy.

The message I'm receiving is:


============
/opt/opt-python-2.7a0/include/python2.7/pyconfig.h:127:1: warning: this is the 
location of the previous definition
ar: adding 1 object files to build/temp.linux-i686-2.7/libnpymath.a
ar: illegal option -- /
Usage: ar [emulation options] [-]{dmpqrstx}[abcfilNoPsSuvV] [member-name] 
[count] archive-file file...
       ar -M [<mri-script]
 commands:
  d            - delete file(s) from the archive
  m[ab]        - move file(s) in the archive
  p            - print file(s) found in the archive
  q[f]         - quick append file(s) to the archive
  r[ab][f][u]  - replace existing or insert new file(s) into the archive
  t            - display contents of archive
  x[o]         - extract file(s) from the archive
 command specific modifiers:
  [a]          - put file(s) after [member-name]
  [b]          - put file(s) before [member-name] (same as [i])
  [N]          - use instance [count] of name
  [f]          - truncate inserted file names
  [P]          - use full path names when matching
  [o]          - preserve original dates
  [u]          - only replace files that are newer than current archive 
contents
 generic modifiers:
  [c]          - do not warn if the library had to be created
  [s]          - create an archive index (cf. ranlib)
  [S]          - do not build a symbol table
  [T]          - make a thin archive
  [v]          - be verbose
  [V]          - display the version number
  @<file>      - read options from <file>
 emulation options:
  No emulation specific options
ar: supported targets: elf32-i386 a.out-i386-linux efi-app-ia32 efi-bsdrv-ia32 
efi-rtdrv-ia32 elf32-little elf32-big elf64-alpha ecoff-litt
lealpha elf64-little elf64-big elf32-littlearm elf32-bigarm elf32-hppa-linux 
elf32-hppa elf64-hppa-linux elf64-hppa elf64-x86-64 elf64-ia64
-little elf64-ia64-big efi-app-ia64 efi-bsdrv-ia64 efi-rtdrv-ia64 elf32-m68k 
a.out-m68k-linux elf32-tradbigmips elf32-tradlittlemips ecoff-
bigmips ecoff-littlemips elf32-ntradbigmips elf64-tradbigmips 
elf32-ntradlittlemips elf64-tradlittlemips elf32-powerpc aixcoff-rs6000 elf32
-powerpcle ppcboot elf64-powerpc elf64-powerpcle aixcoff64-rs6000 elf32-s390 
elf64-s390 elf32-sh-linux elf32-shbig-linux elf32-sparc a.out-
sparc-linux elf64-sparc a.out-sunos-big efi-app-x86_64 efi-bsdrv-x86_64 
efi-rtdrv-x86_64 mach-o-le mach-o-be mach-o-fat pef pef-xlib sym sr
ec symbolsrec tekhex binary ihex trad-core
ar: illegal option -- /
Usage: ar [emulation options] [-]{dmpqrstx}[abcfilNoPsSuvV] [member-name] 
[count] archive-file file...


============

Is there any way I can increase the output to discover what went wrong?

Best regards,
Antonio Cavallo


From georgeoliverGO at gmail.com  Tue May  5 15:17:23 2009
From: georgeoliverGO at gmail.com (George Oliver)
Date: Tue, 5 May 2009 12:17:23 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5117.1241549976.11746.python-list@python.org>
Message-ID: <ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>

On May 5, 11:59 am, Dave Angel <da... at ieee.org> wrote:

> 1) forget about getattr() unless you have hundreds of methods in your
> map.  The real question is why you need two maps. What good is the
> "command string" doing you?   Why not just map the keyvalues directly
> into function objects?


Thanks for the reply Dave. I understand your example and it's what I
originally used. Here is more detail on what I'm doing now, I hope
this will explain my question better.

In the game I'm writing the player, monsters, items and so on are
instances of class Thing, like:

class Thing(object):
    def __init__(self, x, y, name):
        self.x, self.y = x, y
        self.name = name
        self.brain = None

Some Things have an instance of class Brain attached. The Brain
instance has a list of handlers, like:

class Brain(object):
    def __init__(self):
        self.handlers = []

A handler class defines some functionality for the Brain. Each Brain
has an update method like this:

def update(self, arguments):
    for handler in self.handlers:
        handler.update(arguments)

So on each pass through the main game loop, it calls the update method
of all the brains in the game, which run their handler update methods
to change the state of the game.

A handler would be something like a key input handler. The key input
handler is defined separately from the command handler in the case I
want to use a different method of input, for example a mouse or
joystick.

In the dictionary of key inputs I could map each input directly to a
function. However there is no instance name I can call the function
on, as I create a thing, add a brain, and add handlers to the brain
like this:

player = Thing(26, 16, 'player')
player.brain = Brain()
player.brain.add_handlers(
                            commandHandler(player.brain, player),
                            keyboardHandler(player.brain),
                            fovHandler(player.brain))


So what I'm wondering is how to reference the instance in each brain's
list of handlers when I want to map something like a key input to a
command, or what a better way might be to structure the code.








From mail at timgolden.me.uk  Tue May  5 15:27:37 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 05 May 2009 20:27:37 +0100
Subject: SQL and CSV
In-Reply-To: <1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
Message-ID: <4A009329.70608@timgolden.me.uk>

Nick wrote:
> Part of the problem is that the 'selection' needs to be in a config
> file. I can put the if row['status'] != 'Cancelled': return True into
> a config, read it and eval it, but its not quite as clean as an sql
> route.


Still not clear what the restriction is. If you were writing
SQL you'd have to read *something* from your config file,
unless you're suggesting that the "config file" is in fact
a SQL file. Which is one way of doing it, but then you might
just as well have your config file as a Python file and
import it.

Have I missed the point somewhere here? Can you give an
example -- even a fictional one -- of what you couldn't
do using, say, the example I gave earlier?

TJG


From showell30 at yahoo.com  Tue May  5 15:50:41 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 5 May 2009 12:50:41 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com>

On May 4, 11:08?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
>
> I propose a small piece of sugar. When a function is entered, Python
> creates an ordinary local name in the function's local namespace, and
> binds the function itself to that name. Two possibilities for the name
> are `this` or `__this__`, analogous to `self` in methods and `__name__`
> in modules.
>
> If there is any support for this, I propose to send the following (long)
> post to python-ideas. Feedback, corrections and suggestions welcome.
>

I totally support this proposal.   I've definitely wasted time in the
past trying to invent my own workarounds for the use cases you
describe.

Obviously, there will be some bikeshed debates on __this__ vs.
__name__ vs. __func__, etc.  I don't have an opinion there, just want
*something* handy for introspection, DRYness, etc.

A more interesting question is whether __this__ would just always be
there (that's my vote), or if you should have to apply a special
decorator to get it (which I oppose, but I can see some merits).



From kushal.kumaran at gmail.com  Tue May  5 15:51:04 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Wed, 6 May 2009 01:21:04 +0530
Subject: Way to use proxies & login to site?
In-Reply-To: <629c75b1-9e67-44fb-9de0-0a23ff6c306b@v23g2000pro.googlegroups.com>
References: <36bb20c2-2199-42bb-a123-171bf380182c@y10g2000prc.googlegroups.com>
	<629c75b1-9e67-44fb-9de0-0a23ff6c306b@v23g2000pro.googlegroups.com>
Message-ID: <1e364c4e0905051251g7f98c61ds941c9574f589aa65@mail.gmail.com>

On Wed, Apr 29, 2009 at 8:21 AM, inVINCable <inVINCEable667 at gmail.com> wrote:
> On Apr 27, 7:40?pm, inVINCable <inVINCEable... at gmail.com> wrote:
>> Hello,
>>
>> I have been using ClientForm to log in to sites & ClientCookie so I
>> can automatically log into my site to do some penetration testing,
>> although, I cannot figure out a solution to use proxies with this
>> logging in automatically. Does anyone have any solutions?
>>
>> Thanks :)
>>
>> Vince
>
> Any ideas?

If, like the example at http://wwwsearch.sourceforge.net/ClientForm/,
you are using urllib2, you can read the documentation for that module.
 It also has examples for working with proxies.

-- 
kushal


From castironpi at gmail.com  Tue May  5 16:02:47 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 5 May 2009 13:02:47 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com>
Message-ID: <4a69c949-ace7-47d9-8bb7-d05bc6c895f3@s31g2000vbp.googlegroups.com>

On May 5, 2:50?pm, Steve Howell <showel... at yahoo.com> wrote:
> On May 4, 11:08?pm, Steven D'Aprano
>
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>
> > I propose a small piece of sugar. When a function is entered, Python
> > creates an ordinary local name in the function's local namespace, and
> > binds the function itself to that name. Two possibilities for the name
> > are `this` or `__this__`, analogous to `self` in methods and `__name__`
> > in modules.
>
> > If there is any support for this, I propose to send the following (long)
> > post to python-ideas. Feedback, corrections and suggestions welcome.
>
> I totally support this proposal. ? I've definitely wasted time in the
> past trying to invent my own workarounds for the use cases you
> describe.
>
> Obviously, there will be some bikeshed debates on __this__ vs.
> __name__ vs. __func__, etc. ?I don't have an opinion there, just want
> *something* handy for introspection, DRYness, etc.
>
> A more interesting question is whether __this__ would just always be
> there (that's my vote), or if you should have to apply a special
> decorator to get it (which I oppose, but I can see some merits).

Here is how to get the function into the function as an argument, and
still permit recursive calls onto it.

>>> def auto( f ):
...     def _inner( *ar, **kw ):
...             return f( g, *ar, **kw )
...     g= _inner
...     return g
...
>>> @auto
... def f( self, n ):
...     print( self, n )
...     return 1 if n== 1 else n* self( n- 1 )
...
>>> f(7)
<function _inner at 0x00BA0D68> 7
<function _inner at 0x00BA0D68> 6
<function _inner at 0x00BA0D68> 5
<function _inner at 0x00BA0D68> 4
<function _inner at 0x00BA0D68> 3
<function _inner at 0x00BA0D68> 2
<function _inner at 0x00BA0D68> 1
5040

The function that is passed into the function is the decorated
function, not the original.  The decorator function is also returned
from the decorator calls, so both the external caller and the internal
caller are calling the same function, '_inner' in the sample, which
then back-calls the original.

Please stay tuned for the post-graduate lecture.  There will be time
for questions at the cookies-and-creme seminar afterward.


From garylinux at gmail.com  Tue May  5 16:12:17 2009
From: garylinux at gmail.com (justme)
Date: Tue, 5 May 2009 13:12:17 -0700 (PDT)
Subject: AutoComplete in C++ Editor for Python
References: <ee4e405c-d13f-432e-b704-9b989d64ffcb@s28g2000vbp.googlegroups.com>
Message-ID: <3746e883-79bc-444c-8b09-641675339954@s20g2000vbp.googlegroups.com>

I the rope project http://rope.sourceforge.net/ has an autocomplete
lib.
(I have not used it  just remember reading about it)


From castironpi at gmail.com  Tue May  5 16:16:39 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 5 May 2009 13:16:39 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5117.1241549976.11746.python-list@python.org>
	<ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
Message-ID: <0c2f0973-1829-46fa-a28c-c38e7906e750@l5g2000vbc.googlegroups.com>

On May 5, 2:17?pm, George Oliver <georgeolive... at gmail.com> wrote:
> On May 5, 11:59 am, Dave Angel <da... at ieee.org> wrote:
>
> > 1) forget about getattr() unless you have hundreds of methods in your
> > map. ?The real question is why you need two maps. What good is the
> > "command string" doing you? ? Why not just map the keyvalues directly
> > into function objects?
>
> Thanks for the reply Dave. I understand your example and it's what I
> originally used. Here is more detail on what I'm doing now, I hope
> this will explain my question better.
>
> In the game I'm writing the player, monsters, items and so on are
> instances of class Thing, like:
>
> class Thing(object):
> ? ? def __init__(self, x, y, name):
> ? ? ? ? self.x, self.y = x, y
> ? ? ? ? self.name = name
> ? ? ? ? self.brain = None
>
> Some Things have an instance of class Brain attached. The Brain
> instance has a list of handlers, like:
>
> class Brain(object):
> ? ? def __init__(self):
> ? ? ? ? self.handlers = []
>
> A handler class defines some functionality for the Brain. Each Brain
> has an update method like this:
>
> def update(self, arguments):
> ? ? for handler in self.handlers:
> ? ? ? ? handler.update(arguments)
>
> So on each pass through the main game loop, it calls the update method
> of all the brains in the game, which run their handler update methods
> to change the state of the game.
>
> A handler would be something like a key input handler. The key input
> handler is defined separately from the command handler in the case I
> want to use a different method of input, for example a mouse or
> joystick.
>
> In the dictionary of key inputs I could map each input directly to a
> function. However there is no instance name I can call the function
> on, as I create a thing, add a brain, and add handlers to the brain
> like this:
>
> player = Thing(26, 16, 'player')
> player.brain = Brain()
> player.brain.add_handlers(
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? commandHandler(player.brain, player),
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? keyboardHandler(player.brain),
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? fovHandler(player.brain))
>
> So what I'm wondering is how to reference the instance in each brain's
> list of handlers when I want to map something like a key input to a
> command, or what a better way might be to structure the code.

I'm not entirely sure I follow, but you may want to try keeping a set
(or list) of handlers that you pass in to the 'add_handlers' function,
and trying the 'getattr( handlerX, keyY )' on each of them, possible
only until you have a success.  You could also cache these results to
avoid performing the same search subsequently.

Otherwise, query each of the passed-in handlers when they are passed
in for a list of events they can handle; this may be by a brute
'getattr( x ) for x in ALL_EVENTS', or by maintaining a list of
handlers on a per-object basis, and merely combining the dictionaries;
then pick one or all of the handlers you've accumulated for an event
when the event occurs.

</run-on sentence>

If you're really trying to be clever, you might use a metaclass or
class decorator to accumulate what events are handled in a class; or
just try the '__dict__' member of the /class/.

Will any of your handlers be handling overlapping or duplicate
events?  Do they all get a crack at it, or do you follow a pre-
deterimend order of precedence, or follow the order in which they were
passed in?

I'd probably try to discourage you from circularly linking the object
and handlers, not only for practical reasons.

There is also the possibility you could use dynamic mix-ins to create
a specialized once-in-a-lifetime brain class:

def create_brain( handlers ):
    class new_brain( Brain ):
        pass
    for x in handlers:
        setattr( new_brain, x.__name__, x )
    return new_brain

brain= create_brain( handlers )( creation_args )

Forgive, just Thing-king aloud.


From duncan.booth at invalid.invalid  Tue May  5 16:19:54 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 May 2009 20:19:54 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com>
	<4a69c949-ace7-47d9-8bb7-d05bc6c895f3@s31g2000vbp.googlegroups.com>
Message-ID: <Xns9C02D8FA81FF2duncanbooth@127.0.0.1>

Aaron Brady <castironpi at gmail.com> wrote:

> Here is how to get the function into the function as an argument, and
> still permit recursive calls onto it.
> 
>>>> def auto( f ):
> ...     def _inner( *ar, **kw ):
> ...             return f( g, *ar, **kw )
> ...     g= _inner
> ...     return g
> ...
>>>> @auto
> ... def f( self, n ):
> ...     print( self, n )
> ...     return 1 if n== 1 else n* self( n- 1 )
> ...
>>>> f(7)
><function _inner at 0x00BA0D68> 7
><function _inner at 0x00BA0D68> 6
><function _inner at 0x00BA0D68> 5
><function _inner at 0x00BA0D68> 4
><function _inner at 0x00BA0D68> 3
><function _inner at 0x00BA0D68> 2
><function _inner at 0x00BA0D68> 1
> 5040
> 

It might be better to use some convention other than 'self' for the first 
argument otherwise it will cause confusion when writing recursive methods:

>>> class C(object):
	@auto
	def meth(this, self, n):
		print this, self, n
		return 1 if n==1 else n*this(self, n-1)

>>> inst = C()
>>> inst.meth(5)
<function _inner at 0x0000000003680198> <__main__.C object at 
0x000000000366C4E0> 5
<function _inner at 0x0000000003680198> <__main__.C object at 
0x000000000366C4E0> 4
<function _inner at 0x0000000003680198> <__main__.C object at 
0x000000000366C4E0> 3
<function _inner at 0x0000000003680198> <__main__.C object at 
0x000000000366C4E0> 2
<function _inner at 0x0000000003680198> <__main__.C object at 
0x000000000366C4E0> 1
120


From ross.jett at gmail.com  Tue May  5 16:25:24 2009
From: ross.jett at gmail.com (Ross)
Date: Tue, 5 May 2009 13:25:24 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
Message-ID: <3a4e6e31-76fd-4a85-8270-a7efbaf2ff1d@o27g2000vbd.googlegroups.com>

On May 5, 1:33?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Ross wrote:
> > On May 5, 12:32 am, John Yeung <gallium.arsen... at gmail.com> wrote:
> >> On May 5, 1:12 am, John Yeung <gallium.arsen... at gmail.com> wrote:
>
> >>> [...] the problem may require bigger guns (either much better
> >>> math or much more sophisticated programming).
> >> Yes, I'm responding to myself.
>
> >> Well, I went ahead with the approach I mentioned earlier, generating
> >> all possible matches and then selecting among them as needed to fill
> >> up the courts, trying to keep the number of matches played by each
> >> player as fair as possible. ?(I should mention that this, or something
> >> similar, was suggested earlier by someone else in a different thread,
> >> in response to the same question by the same OP.)
>
> >> I did use "bigger guns" (mainly a class for player objects, with
> >> custom __cmp__ method), but still didn't do anything with doubles.
>
> >> I haven't tested it much, but I'll post it if anyone's interested.
> >> (That way people can pick on me instead of the OP. ;)
>
> >> John
>
> > I'm interested to see what you did. From your description, it sounds
> > like I've tried what you've done, but when I implemented my version,
> > it took minutes to evaluate for bigger numbers. If that isn't the case
> > with yours, I'd be interested in seeing your implementation.
>
> Here's my approach (incomplete):
>
> def get_pair(player_list, played):
> ? ? ?for first in range(len(player_list)):
> ? ? ? ? ?player_1 = player_list[first]
> ? ? ? ? ?for second in range(first + 1, len(player_list)):
> ? ? ? ? ? ? ?player_2 = player_list[second]
> ? ? ? ? ? ? ?pair = player_1, player_2
> ? ? ? ? ? ? ?sorted_pair = tuple(sorted(pair))
> ? ? ? ? ? ? ?if sorted_pair not in played:
> ? ? ? ? ? ? ? ? ?played.add(sorted_pair)
> ? ? ? ? ? ? ? ? ?del player_list[second]
> ? ? ? ? ? ? ? ? ?del player_list[first]
> ? ? ? ? ? ? ? ? ?return pair
> ? ? ?return None
>
> def round_robin(player_list, courts, played):
> ? ? ?playing = []
> ? ? ?for c in range(courts):
> ? ? ? ? ?pair = get_pair(player_list, played)
> ? ? ? ? ?if pair is None:
> ? ? ? ? ? ? ?break
> ? ? ? ? ?playing.append(pair)
> ? ? ?byes = player_list[:]
> ? ? ?player_list[:] = byes + [player for pair in playing for player in pair]
> ? ? ?yield playing, byes
>
> def test_round_robin(players, rounds, courts, doubles=False):
> ? ? ?player_list = range(players)
> ? ? ?played = set()
> ? ? ?for r in range(rounds):
> ? ? ? ? ?for playing, byes in round_robin(player_list, courts, played):
> ? ? ? ? ? ? ?print playing, byes- Hide quoted text -
>
> - Show quoted text -

Looks like somewhat of an improvement, although the bye distribution
is still slightly lopsided. For example, in a singles league with 12
players, 12 rounds, and 4 courts, The first player had at least 2 less
byes than every other player and 3 less byes than the players with the
most number of byes. Thanks for your input though...I'll look into how
I can improve upon it.


From doctoresam at gmail.com  Tue May  5 16:37:53 2009
From: doctoresam at gmail.com (Deep_Feelings)
Date: Tue, 5 May 2009 13:37:53 -0700 (PDT)
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
	<mailman.5031.1241420740.11746.python-list@python.org>
Message-ID: <81f82d8c-80fa-4ba0-a402-3a8b5757a967@s16g2000vbp.googlegroups.com>

that is good ,thank you

anyone did that ? learning from python docs straight away ?


From bearophileHUGS at lycos.com  Tue May  5 16:43:16 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 5 May 2009 13:43:16 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
Message-ID: <4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>

wolfram.hinde...:
> It is easy to change all references of the function name, except for
> those in the function body itself? That needs some explantation.

I can answer this. If I have a recursive function, I may want to
create a similar function, so I copy and paste it, to later modify the
copied version. Then to change its name I usually don't use a search &
rename of its name into its block of code because it's usually
useless. In non-recursive functions the name of the function is stated
only once, at the top.

Recursive functions violate the DRY principle, that's the root of the
problem.

The auto(f) decorator shown later by Aaron Brady seems the best
solution found so far, it's so nice that it even seems practically
usable.

Bye,
bearophile


From bearophileHUGS at lycos.com  Tue May  5 16:54:44 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 5 May 2009 13:54:44 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com> 
	<4a69c949-ace7-47d9-8bb7-d05bc6c895f3@s31g2000vbp.googlegroups.com>
Message-ID: <50222a39-88d0-49da-9105-2d3a47af5940@r34g2000vba.googlegroups.com>

Aaron Brady:
> >>> def auto( f ):
>
> ... ? ? def _inner( *ar, **kw ):
> ... ? ? ? ? ? ? return f( g, *ar, **kw )
> ... ? ? g= _inner
> ... ? ? return g

Looks nice, I'll try to the following variant to see if it's usable:

def thisfunc(fun):
    """Decorator to inject a default name of a
    function inside a function"""
    def _inner(*args, **kwds):
        return fun(g, *args, **kwds)
    g = _inner
    g.__name__ = fun.__name__
    g.__dict__.update(fun.__dict__)
    g.__doc__ = fun.__doc__
    g.__module__ = fun.__module__
    return g

@thisfunc
def SOMEVERYUGLYNAME(this, n):
    return 1 if n <= 1 else n * this(n - 1)

assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6

Bye,
bearophile


From piet at cs.uu.nl  Tue May  5 17:03:28 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Tue, 05 May 2009 23:03:28 +0200
Subject: Error in running python -v on Mac ox 10.5.
References: <b39ce186-56d3-4dae-84ce-24a7c92bb50a@k9g2000pra.googlegroups.com>
Message-ID: <m2bpq7mfdr.fsf@cs.uu.nl>

>>>>> silverburgh <silverburgh.meryl at gmail.com> (s) wrote:

>s> Hi,

>s> I run 'python -v' on Macos 10.5 but I get this error :
>s> # can't create /System/Library/Frameworks/Python.framework/Versions/
>s> 2.5/lib/python2.5/encodings/utf_8.pyc

>s> Can you please tell me how to fix it?

This looks like the utf_8.py file has not been compiled in the
installation. Looks like a (not serious) bug to me.

Probably sudo python -v would solve it (even without -v, but it will
tell you that it wrote the .pyc file).

>s> And why I am seeing a lot of 'install' message' when i run 'python -
>s> v'? I don't think I see that many
>s> install message on linux.

I don't see 'install' messages in the included text.
>s> Here is the full message.  Thanks for any help.
[deleted]
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From castironpi at gmail.com  Tue May  5 17:20:15 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 5 May 2009 14:20:15 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com> 
	<4a69c949-ace7-47d9-8bb7-d05bc6c895f3@s31g2000vbp.googlegroups.com> 
	<50222a39-88d0-49da-9105-2d3a47af5940@r34g2000vba.googlegroups.com>
Message-ID: <5b81cccc-c174-42bd-b4a0-638755ca9e03@l5g2000vbc.googlegroups.com>

On May 5, 3:54?pm, bearophileH... at lycos.com wrote:
> Aaron Brady:
>
> > >>> def auto( f ):
>
> > ... ? ? def _inner( *ar, **kw ):
> > ... ? ? ? ? ? ? return f( g, *ar, **kw )
> > ... ? ? g= _inner
> > ... ? ? return g
>
> Looks nice, I'll try to the following variant to see if it's usable:
>
> def thisfunc(fun):
> ? ? """Decorator to inject a default name of a
> ? ? function inside a function"""
> ? ? def _inner(*args, **kwds):
> ? ? ? ? return fun(g, *args, **kwds)
> ? ? g = _inner
> ? ? g.__name__ = fun.__name__
> ? ? g.__dict__.update(fun.__dict__)
> ? ? g.__doc__ = fun.__doc__
> ? ? g.__module__ = fun.__module__
> ? ? return g
>
> @thisfunc
> def SOMEVERYUGLYNAME(this, n):
> ? ? return 1 if n <= 1 else n * this(n - 1)
>
> assert SOMEVERYUGLYNAME(6) == 2*3*4*5*6
>
> Bye,
> bearophile

/Actually/, the 'g' variable was spurious.  FWIW.

def auto( f ):
    def _inner( *ar, **kw ):
        return f( _inner, *ar, **kw )
    return _inner



From robert.kern at gmail.com  Tue May  5 17:30:02 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 05 May 2009 17:30:02 -0400
Subject: Numpy on python 2.7a
In-Reply-To: <200905052006.17708.a.cavallo@cavallinux.eu>
References: <200905052006.17708.a.cavallo@cavallinux.eu>
Message-ID: <gtqb4q$us$1@ger.gmane.org>

On 2009-05-05 15:06, A. Cavallo wrote:
> Hi,
>
> I'm trying to compile numpy using my own pet project based on the python svn
> code (that's the reason for the 2.7a tag).

Ask on the numpy-discussion mailing list:

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From QJing.Li at gmail.com  Tue May  5 17:42:15 2009
From: QJing.Li at gmail.com (Leon)
Date: Tue, 5 May 2009 14:42:15 -0700 (PDT)
Subject: what's the best way to call a method of object without a 
	guarantee of its existence
References: <22690572-e338-483a-a99a-85ccf6c5fae6@x6g2000vbg.googlegroups.com>
	<9uULl.4199$Ux.2825@tornado.fastwebnet.it>
Message-ID: <0348bb8e-3c1a-410d-a886-352b9b0ae391@e23g2000vbe.googlegroups.com>


On May 5, 3:25?am, Marco Mariani <ma... at sferacarta.com> wrote:
> Leon wrote:
> > One way, ?define the object before it is used,
> > like this:
> > object = None
>
> This is a good practice anyway. Conditional existance of objects is
> quite evil. Resorting to if defined('foo') is double-plus-ugly.

This was why I asked this question. In my program, I use the pattern
of
object.method() a lot, but every time I need to check if it exists or
not,
which makes me feel uncomfortable.


> > The other way, using try ... catch
> > try:
> > ? ? ?object.method()
> > catch NameError:
> > ? ? ?pass
>
> Except you should trap AttributeError because you defined the thing as
> None before. NameErrors should be fixed as bugs, not trapped (IMHO --
> but in python there is always a use case for everything).
>
> Keep in mind that AttributeError might come from inside the method(),
> which could be confusing
>
> By using the
>
> if stuff:
> ? ? stuff.run()
>
> idiom, you avoid the last issue and keep it simple enough.
>
> > for ?big programs, which is better, or any other way?
>
> Define "big", as in scope, LOCs, or number of committers?
"big", I mean, is not in the same scope
For instance,


class frame(wx.Frame):
  def __init__(self, parent, ....):
      ....
      self.parent = parent # parent from another module
      .....

  def eventHandler_1(self,event):
      if self.parent.object_1 is not None:
         self.parent.object_1.method()

  def eventHandler_2(self, event):
      if self.parent.object_2 is not None:
         self.parent.object_2.method()

So I need to go back to the module including "parent" class
to define the objects that I maybe use in future as None,
actually, the module including "parent' class works very well
without those definitions, from parent class's point of view,
those definitions are kind of noisy.

Thanks Marco




From gunterhenriksen at gmail.com  Tue May  5 18:05:46 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Tue, 5 May 2009 15:05:46 -0700
Subject: How to walk up parent directories?
In-Reply-To: <87ocu9k6c4.fsf@benfinney.id.au>
References: <zarLl.28477$yr3.5401@nlpi068.nbdc.sbc.com>
	<87ocu9k6c4.fsf@benfinney.id.au>
Message-ID: <ab4fa3490905051505l76ce3a57yb79c2b26f1abfbba@mail.gmail.com>

Be careful not to presume "/a/b/" is the same directory as "/a/b/c/../"
I would consider the latter the parent of /a/b/c/, not the former.


From tjreedy at udel.edu  Tue May  5 18:14:19 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 05 May 2009 18:14:19 -0400
Subject: Google selects Mercurial for DVCS support
Message-ID: <gtqdnp$9cd$1@ger.gmane.org>

Given the debate over Python's choice of Mercurial, some might fine the 
following interesting.
http://google-code-updates.blogspot.com/2009/04/mercurial-support-for-project-hosting.html
Currently, Mercurial support will be in addition to continued Subversion 
support.

It was also reported on
http://arstechnica.com/open-source/news/2009/04/google-code-adds-mercurial-version-control-system.ars
with comments.



From georgeoliverGO at gmail.com  Tue May  5 18:15:37 2009
From: georgeoliverGO at gmail.com (George Oliver)
Date: Tue, 5 May 2009 15:15:37 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5117.1241549976.11746.python-list@python.org>
	<ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
	<0c2f0973-1829-46fa-a28c-c38e7906e750@l5g2000vbc.googlegroups.com>
Message-ID: <045e683e-5791-4af0-a400-b759064a8046@v23g2000pro.googlegroups.com>

Thanks for the suggestions so far. I've taken the advice to keep
things simple so currently I'm just creating one instance of the
commandHandler and assigning it a name with command = commandHandler
(). This makes it easy to call it from any of the other handlers, and
I think this will work for what I want the game to do.


From deets at nospam.web.de  Tue May  5 18:26:30 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 06 May 2009 00:26:30 +0200
Subject: Error in running python -v on Mac ox 10.5.
In-Reply-To: <b39ce186-56d3-4dae-84ce-24a7c92bb50a@k9g2000pra.googlegroups.com>
References: <b39ce186-56d3-4dae-84ce-24a7c92bb50a@k9g2000pra.googlegroups.com>
Message-ID: <76bsomF1bmc0oU1@mid.uni-berlin.de>

silverburgh schrieb:
> Hi,
> 
> I run 'python -v' on Macos 10.5 but I get this error :
> # can't create /System/Library/Frameworks/Python.framework/Versions/
> 2.5/lib/python2.5/encodings/utf_8.pyc
> 
> Can you please tell me how to fix it?

This looks like a rights-problem to me, and a missing pyc-file.

If you do

sudo python -v

does it work? Then, utf_8.pyc might have been created, and subsequent 
sudo-less inovcations might work.

Diez


From google at mrabarnett.plus.com  Tue May  5 18:33:34 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 05 May 2009 23:33:34 +0100
Subject: Self function
In-Reply-To: <6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>	<m2iqkhnzxy.fsf@googlemail.com>	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>	<mailman.5072.1241474108.11746.python-list@python.org>	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com>
Message-ID: <4A00BEBE.90608@mrabarnett.plus.com>

Steve Howell wrote:
> On May 4, 11:08 pm, Steven D'Aprano
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> I propose a small piece of sugar. When a function is entered, Python
>> creates an ordinary local name in the function's local namespace, and
>> binds the function itself to that name. Two possibilities for the name
>> are `this` or `__this__`, analogous to `self` in methods and `__name__`
>> in modules.
>>
>> If there is any support for this, I propose to send the following (long)
>> post to python-ideas. Feedback, corrections and suggestions welcome.
>>
> 
> I totally support this proposal.   I've definitely wasted time in the
> past trying to invent my own workarounds for the use cases you
> describe.
> 
> Obviously, there will be some bikeshed debates on __this__ vs.
> __name__ vs. __func__, etc.  I don't have an opinion there, just want
> *something* handy for introspection, DRYness, etc.
> 
> A more interesting question is whether __this__ would just always be
> there (that's my vote), or if you should have to apply a special
> decorator to get it (which I oppose, but I can see some merits).
> 
I'd say that __this__ is a little unclear, so I'd choose __func__.


From norseman at hughes.net  Tue May  5 19:28:41 2009
From: norseman at hughes.net (norseman)
Date: Tue, 05 May 2009 16:28:41 -0700
Subject: Any idea to emulate tail -f
In-Reply-To: <1241503205.5374.25.camel@keblar.lapjoe>
References: <1241503205.5374.25.camel@keblar.lapjoe>
Message-ID: <4A00CBA9.6030402@hughes.net>

Joel Juvenal Rivera Rivera wrote:
> I want to make something very similar to  the command tail -f (follow a
> file), i have been trying  with some while True and some microsleeps
> (about .1 s); did someone has already done something like this?
> 
> And about the file is the apache acceslog  of a site with a lot of
> traffic.
> 
> Regards    
> 
> joe / Joel Rivera
> 
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
==============================================
I read the 4 replies available at this point in time. I agree with them 
in the general sense.

Question 1:  Why not use tail -f | my_program.py ??
               (The obvious answer is that you are not in a Unix OS)

Question 2:  Have you looked at Popen2.popen3? (No, you are not in ..)
                In the Unix environment one can output to log files that
                are actually named pipes. Program 'up and running' leaves
                the keyboard (or in this case stdin) open.  Kinda like
                typing something into the letter, go to lunch, come back
                and type in some more.  Self regulating.  Might be able
                to dummy up something that emulates the concept.

Question 3:  How much CPU time do you need dedicated to this?
                Running a program again every 0.1seconds uses resources.
                CRON at x-minute intervals uses less. (bigger the x, less
                the resources.)

Question 4:  Is the program looking for things that, if found, need to
                sound the Claxton (nasty ear ponding alarm noise)?
              Or is it just to update the monitor over there on the side?
                (ie.. How time critical is it?) This effects Q3's answer.

Question 5:  Does the monitor machine just have to be NOT Linux?
              Does the log file just have to be NOT on a Linux machine?

If the Claxton is the point of your program, consider Q5 carefully.  If 
for some reason the log can not reside on a Linux/Unix drive, see if 
samba type linkage from a Linux to the logfile OS is doable. (It is if 
the IT types don't get in the way.)  From Linux you then mount the samba 
and use the soft link and run your program accordingly and it works as 
hinted in questions 1 and 2. Soft link is created by:
ln -s /path/real_file /different_path/same_or_different_f-name
2nd is treated as original and reacts same as if it were.


I would make one request.  Please tell people the OS you want the 
program on when you ask the question originally. To use yours:

"I want to make something very similar to the command tail -f ..." FOR 
USE IN MS WINDOWS XP.  or whatever.
XP and VISTA have frustrating differences and neither are UNIX or MAC.


I know I haven't given anything like the answers the others provided, 
but then I really am not sure of the intended use or OS.

Fire alarms are one thing, gleaning is another.  One is extremely time 
critical while for the other "tomorrow" is OK.


Steve


From rhodri at wildebst.demon.co.uk  Tue May  5 20:06:35 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 06 May 2009 01:06:35 +0100
Subject: call function of class instance with no assigned name?
In-Reply-To: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
Message-ID: <op.uthek9t1a8ncjz@gnudebst>

On Tue, 05 May 2009 16:52:39 +0100, George Oliver  
<georgeoliverGO at gmail.com> wrote:

> hi, I'm a Python beginner with a basic question. I'm writing a game
> where I have keyboard input handling defined in one class, and command
> execution defined in another class. The keyboard handler class
> contains a dictionary that maps a key to a command string (like 'h':
> 'left') and the command handler class contains functions that do the
> commands (like def do_right(self):),
>
> I create instances of these classes in a list attached to a third,
> 'brain' class. What I'd like to have happen is when the player presses
> a key, the command string is passed to the command handler, which runs
> the function. However I can't figure out a good way to make this
> happen.
>
> I've tried a dictionary mapping command strings to functions in the
> command handler class, but those dictionary values are evaluated just
> once when the class is instantiated. I can create a dictionary in a
> separate function in the command handler (like a do_command function)
> but creating what could be a big dictionary for each input seems kind
> of silly (unless I'm misunderstanding something there).

Taking a wild guess when you were creating that dictionary mapping
command strings to functions, did you map to function calls or to the
function objects themselves?  I'd make a small wager you did the former,
and the latter would have done what you want.  Something like this,
maybe?

>>>> CODE FOLLOWS<<<<

class DoSomething(object):
     def do_this(self):
         print "Doing this"

     def do_that(self):
         print "Doing that"

     def do_the_other(self):
         print "Doing the other"

     _CMD_DICT = { 'this' : do_this,
                   'that' : do_that,
                   'the other' : do_the_other }

     def update(self, cmd):
         try:
             DoSomething._CMD_DICT[cmd](self)
         except KeyError:
             print "Foul!  Foul, I say!"

>>>> END CODE<<<<

To be honest, the getattr approach is probably as easy to follow
and less prone to forgetting to update the dictionary.


-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From cournape at gmail.com  Tue May  5 20:37:21 2009
From: cournape at gmail.com (David Cournapeau)
Date: Wed, 6 May 2009 09:37:21 +0900
Subject: Numpy on python 2.7a
In-Reply-To: <200905052006.17708.a.cavallo@cavallinux.eu>
References: <200905052006.17708.a.cavallo@cavallinux.eu>
Message-ID: <5b8d13220905051737g222bdb62y2d7c6c132b9e82bc@mail.gmail.com>

On Wed, May 6, 2009 at 4:06 AM, A. Cavallo <a.cavallo at cavallinux.eu> wrote:
> Hi,
>
> I'm trying to compile numpy using my own pet project based on the python svn
> code (that's the reason for the 2.7a tag).

It is a python bug, see bugs 5940 and 5941.

cheers,

David


From silverburgh.meryl at gmail.com  Tue May  5 20:57:40 2009
From: silverburgh.meryl at gmail.com (silverburgh)
Date: Tue, 5 May 2009 17:57:40 -0700 (PDT)
Subject: Install Python 3.0 dmg to macos 10.5
Message-ID: <627526f7-ac27-4874-b234-13d1a13accf5@y33g2000prg.googlegroups.com>

Hi,

If I install python 3.0 dmg, will it wipe out the existing python
installation on macos 10.5 (i don't know how the original python was
installed ( i think it is version 2.5).

Thank you.


From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 20:58:03 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 06 May 2009 00:58:03 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com>
	<mailman.5100.1241526783.11746.python-list@python.org>
	<565698f7-d95b-4b99-95a5-5de68d983400@q2g2000vbr.googlegroups.com>
Message-ID: <pan.2009.05.06.00.58.02@REMOVE.THIS.cybersource.com.au>

On Tue, 05 May 2009 06:30:01 -0700, Arnaud Delobelle wrote:

> One issue with automatically binding a local variable to the current
> function is with nested functions:
> 
> def foo()
>     def bar():
>        # How do I call foo() from here?

As foo(), just like you would call foo() from outside of foo(). __this__ 
would refer to bar() inside bar().

My proposal isn't meant to solve the general case "how do I call any 
function anywhere without knowing its name?". I don't think there is a 
general solution to that problem (although obviously you can do it in 
special cases). My proposal is sugar for a fairly general problem "how 
should a function refer to itself?", not an alternative mechanism for 
referring to functions outside of the usual namespace lookup mechanism.



> One solution would be
> 
> def foo()
>     def bar(foo=__this__):
>         foo()


That would be an option, if the programmer had some reason for wanting to 
do this.
 


-- 
Steven


From rhodri at wildebst.demon.co.uk  Tue May  5 21:35:08 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 06 May 2009 02:35:08 +0100
Subject: Self function
In-Reply-To: <4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
Message-ID: <op.uthious2a8ncjz@gnudebst>

On Tue, 05 May 2009 21:43:16 +0100, <bearophileHUGS at lycos.com> wrote:

> wolfram.hinde...:
>> It is easy to change all references of the function name, except for
>> those in the function body itself? That needs some explantation.
>
> I can answer this. If I have a recursive function, I may want to
> create a similar function, so I copy and paste it, to later modify the
> copied version. Then to change its name I usually don't use a search &
> rename of its name into its block of code because it's usually
> useless. In non-recursive functions the name of the function is stated
> only once, at the top.

I'm sorry, but while I'm mildly positive towards the proposal (and more
so towards Aaron's decorator), I don't buy this argument at all.  What
is broken about your editor's global search-and-replace function that
makes it "usually useless" for making these name changes?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From revathi5587 at gmail.com  Tue May  5 21:36:56 2009
From: revathi5587 at gmail.com (revathy)
Date: Tue, 5 May 2009 18:36:56 -0700 (PDT)
Subject: work at online earn 50$ daily
Message-ID: <aa363403-fa56-4534-8355-89b6aad71050@x29g2000prf.googlegroups.com>

click the following link

==========================================

http://www.s1.webstarts.com/physicsengines/

===========================================


From steven at REMOVE.THIS.cybersource.com.au  Tue May  5 21:52:24 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 06 May 2009 01:52:24 GMT
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>
	<49FB2225.4030601@councilforeconed.org> <49FB2AA7.6020403@snet.net>
	<mailman.5113.1241545418.11746.python-list@python.org>
Message-ID: <pan.2009.05.06.01.52.24@REMOVE.THIS.cybersource.com.au>

On Tue, 05 May 2009 13:43:32 -0400, J. Cliff Dyer wrote:

> On Fri, 2009-05-01 at 13:00 -0400, John Posner wrote:
>> Shane Geiger wrote:
>> >    if type(el) == list or type(el) is tuple:
>> A tiny improvement:
>> 
>>         if type(el) in (list, tuple):
>> 
>> 
> Another alternative, which might be useful in some cases:
> 
>           if hasattr(el, '__iter__'):
> 
> This covers all iterables, not just lists and tuples.

Except for the ones that it doesn't cover, like strings:

>>> hasattr('abcd', '__iter__')
False
>>> list(iter('abcd'))
['a', 'b', 'c', 'd']


And classes that follow the sequence protocol:


>>> class Spam:
...     def __getitem__(self, index):
...             if 0 <= index < 5:
...                     return "spam"
...             raise IndexError
...
>>> hasattr(Spam(), '__iter__')
False
>>> list(iter(Spam()))
['spam', 'spam', 'spam', 'spam', 'spam']




-- 
Steven


From gagsl-py2 at yahoo.com.ar  Tue May  5 22:24:32 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 05 May 2009 23:24:32 -0300
Subject: Problem with case insensitive volumes
References: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
	<mailman.5088.1241498014.11746.python-list@python.org>
	<26c57bf5-5ad2-4838-8097-c8d51cf1ccae@n8g2000vbb.googlegroups.com>
	<b4adnUex6-RR2J3XnZ2dnUVZ_t2dnZ2d@pdx.net>
	<b5d10d01-0f56-4df9-9e4e-99a93a0e0a0f@s31g2000vbp.googlegroups.com>
Message-ID: <op.utg15ulfx6zn5v@gabriel.sleipnir-bsas>

En Tue, 05 May 2009 12:55:13 -0300, spillz <damienlmoore at gmail.com>
escribi?:
>
> /my/path/to/usbkey/and/file
>
> everything up to "/my/path/to/usbkey" is case sensitive. only the "and/
> file" is case insensitive. but my list of stored paths might include
> all images under "/my". thus
>
> /my/path/to/usbkey/and/file1==/my/path/to/usbkey/and/FILE1
> /my/path/to/usbkey/and/file1==/my/path/to/usbkey/AND/FILE1
> but
> /my/path/to/usbkey/and/file1!=/my/path/TO/usbkey/AND/FILE1
>
> so to do this right I'd need to establish which parts of the path are
> case insensitive. being able to retrieve the actual path from an
> equivalent representation would be so much simpler.

I use this function on Windows to obtain the true case name of a file:

<code>
  from win32api import FindFiles
  from win32file import FILE_ATTRIBUTE_DIRECTORY
  from os.path import normpath, split, join

def truecase(fullpath, _cache={}):
      """
      Normalize fullpath, returning names using the
      same case as actually used in the filesystem.
      """
      fullpath = normpath(fullpath)
      dirname, filename = split(fullpath)
      dirname = dirname.lower()
      if not filename:
          # drive letter
          result = _cache[dirname] = dirname.upper()
          return result
      if dirname in _cache: dirname = _cache[dirname]
      elif dirname: dirname = truecase(dirname)
      finddata = FindFiles(fullpath)
      if not finddata:
          import errno, os
          raise IOError(errno.ENOENT, os.strerror(errno.ENOENT), fullpath)
      if len(finddata)!=1:
          raise ValueError("Too many results for %r" % fullpath)
      attr = finddata[0][0]
      filename = finddata[0][8]
      result = join(dirname, filename)
      if attr & FILE_ATTRIBUTE_DIRECTORY:
          _cache[result.lower()] = result
      return result
</code>

truecase("c:")=="C:"
truecase("C:\\")=="C:\\"
truecase("c:\\")=="C:\\"
truecase("C:\\TeMp")=="C:\\TEMP"
truecase("C:\\TeMp\\")=="C:\\TEMP\\"
truecase(r"C:\Documents and Settings\gabriel")==r"C:\Documents and
Settings\gabriel"
truecase(r"c:\dOcUmEnTs aNd SeTtInGs\GaBrIeL\mIS DOCUMENTOS\105_3 - nist -
sPECIFICATIONS vOLUMETRIC fIELD sTANDARD.PDF")==r"C:\Documents and
Settings\gabriel\Mis documentos\105_3 - NIST - Specifications Volumetric
Field Standard.pdf"
truecase(r"E:\prog\test\compface\Debug\No existe.txt")

-- 
Gabriel Genellina



From zac256 at gmail.com  Tue May  5 22:52:25 2009
From: zac256 at gmail.com (Zac Burns)
Date: Tue, 5 May 2009 19:52:25 -0700
Subject: Cannot start a thread in atexit callback
Message-ID: <333edbe80905051952v56ced17cl5aaa4b04bb8d3120@mail.gmail.com>

It seems that one cannot start a thread in an atexit callback.

My use case is that I have a IO heavy callback that I want to run in a
thread so that other callbacks can finish while it's doing it's thing
to save on exit time.

Example code (py3k)
############################################
import threading
import time
import atexit

def print_():
??? print(1)
??? time.sleep(1)
??? print(2)

def test():
??? threading.Thread(target=print_).start()


atexit.register(test)
############################################

--
Zachary Burns
(407)590-4814
Aim - Zac256FL
Production Engineer (Digital Overlord)
Zindagi Games


From davea at ieee.org  Tue May  5 22:55:53 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 05 May 2009 22:55:53 -0400
Subject: call function of class instance with no assigned name?
In-Reply-To: <ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>	<mailman.5117.1241549976.11746.python-list@python.org>
	<ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
Message-ID: <4A00FC39.4010107@ieee.org>

George Oliver wrote:
> On May 5, 11:59 am, Dave Angel <da... at ieee.org> wrote:
>
>   
>> 1) forget about getattr() unless you have hundreds of methods in your
>> map.  The real question is why you need two maps. What good is the
>> "command string" doing you?   Why not just map the keyvalues directly
>> into function objects?
>>     
>
>
> Thanks for the reply Dave. I understand your example and it's what I
> originally used. Here is more detail on what I'm doing now, I hope
> this will explain my question better.
>
> In the game I'm writing the player, monsters, items and so on are
> instances of class Thing, like:
>
> class Thing(object):
>     def __init__(self, x, y, name):
>         self.x, self.y = x, y
>         self.name = name
>         self.brain = None
>
> Some Things have an instance of class Brain attached. The Brain
> instance has a list of handlers, like:
>
> class Brain(object):
>     def __init__(self):
>         self.handlers = []
>
> A handler class defines some functionality for the Brain. Each Brain
> has an update method like this:
>
> def update(self, arguments):
>     for handler in self.handlers:
>         handler.update(arguments)
>
> So on each pass through the main game loop, it calls the update method
> of all the brains in the game, which run their handler update methods
> to change the state of the game.
>
> A handler would be something like a key input handler. The key input
> handler is defined separately from the command handler in the case I
> want to use a different method of input, for example a mouse or
> joystick.
>
> In the dictionary of key inputs I could map each input directly to a
> function. However there is no instance name I can call the function
> on, as I create a thing, add a brain, and add handlers to the brain
> like this:
>
> player = Thing(26, 16, 'player')
> player.brain = Brain()
> player.brain.add_handlers(
>                             commandHandler(player.brain, player),
>                             keyboardHandler(player.brain),
>                             fovHandler(player.brain))
>
>
> So what I'm wondering is how to reference the instance in each brain's
> list of handlers when I want to map something like a key input to a
> command, or what a better way might be to structure the code.
>
>
>   
 >>

>>player.brain.add_handlers(
>>                            commandHandler(player.brain, player),
>>                            keyboardHandler(player.brain),
>>                            fovHandler(player.brain))

You're executing commandHandler, and passing its return value into the 
add_handlers() method.  So commandHandler is a function, not a method, 
and what is its relationship to anything that actually processes commands?

Sorry, your pseudo-code is so far from real code that I can't figure out 
what you're doing.  So I guess I can't be any help till something else 
turns up to make it clearer.  Maybe it's just me.




From musicguy at alphaios.net  Tue May  5 23:14:06 2009
From: musicguy at alphaios.net (The Music Guy)
Date: Tue, 5 May 2009 22:14:06 -0500
Subject: FLV download script works, but I want to enhance it
Message-ID: <f61e9a8c0905052014h4ea04ev5d82158d3bf7e17a@mail.gmail.com>

I've written a script that can scan any number of web pages for urls
to .flv (Flash Video) files and then download them using urllib2. It's
kind of like a YouTube download utility, but more general-purpose (and
it doesn't actually work with YouTube. :P). The script works fine; it
even has support for outputting URLs of files it's found to stdout for
chaining to tools like wget.

After I download the files, I usually want to convert them to another
video format using command line tools, and I usually convert each one
in a separate terminal since that way they can all be converted at the
same time rather than one-by-one. Oddly enough, converting tends to
take longer than downloading, but converting multiple files at once is
faster than converting them one-by-one.

What I want to do is add an option to my script that will make it
begin converting each video using my command line tool after each is
downloaded, while at the same time continuing to download other files
in the background. I know this is possible using threading or
subprocesses, but I need help figuring out how to do it. Another thing
I want to do is allow the script to use wget for downloading instead
of urllib2.

The script is below. I've already added the options for the new
features, but they don't do anything yet.

#!/usr/bin/env python

import urllib
import re
import sys
import optparse

HELP = """ %prog [-p] url1, url2, url3, ...

    Flash Video Snagger (FLVSnag)

    Tool for downloading files referenced in the source code of some
    video-displaying websites. Simply pass a website URL as the first
    argument and the HTML will be scanned for URLs to .flv files and
    they will be downloaded.

    Note that all given pages are scanned before the first video is
    downloaded.

    FIXME: Downloads may not occur in the order that they are found.

                                              - The Music Guy, 5/5/09
                                                musicguy at alphaios.net
"""

def main():
    # Create the option parser and parse the options.
    parser = optparse.OptionParser(usage=HELP)
    parser.add_option(
        '-p', '--print',
         action = 'store_true',
         default = False,
         help =
            "Causes the URLs to be printed to stdout (one URL per line) "
            "without actually downloading them. Good for piping."
    )
    parser.add_option(
        '-d', '--dpg',
        action = 'store_true',
        default = False,
        help =
            "TODO: Converts each downloaded file to DPG if dpgconv.py
is available "
            "from the PATH."
    )
    parser.add_option(
        '-w', '--wget',
        action = 'store_true',
        default = False,
        help =
            "TODO: Downloads each file using wget instead of using internal "
            "downloader. Only works if wget is available from the PATH."
    )
    ops,args = parser.parse_args()
    if not args:
        parser.print_usage()
        return

    # Create a pattern that matches embedded .flv file URLs.
    urlre = re.compile("http\:\/\/(?<!\?)[a-zA-Z0-9_ \.\/]*\.flv", re.I)

    # Download the given URLs and scan the files for video URLs.
    m = set()
    for u in args:
        # Try to download the pages.
        try:
            f = urllib.urlopen(u)
        except IOError:
            sys.exit('ERROR: Unable to open url "%s".'%u)
        s = f.read()
        f.close()

        # Add any located URLs to the set.
        m = m.union(urlre.findall(s))

        # Delete page to save space.
        del s

    # If the user did not specify to print video URLs, download the videos.
    if not ops.p:
        # Print a notice if no URLs are found.
        if not m:
            print "No URLs found."
            return

        # Create a pattern to match video filename
        fnre = re.compile("[a-zA-Z0-9_ \.]*\.flv", re.I)

        # Download each video
        for v in m:
            p = fnre.findall(v)[0]
            print 'Downloading "%s" to "%s"...'%(v,p)
            urllib.urlretrieve(v,p)
            print 'done.'

    # If the user said to print video URLs, just print, don't download.
    else:
        for v in m:
            print v


if __name__ == '__main__':
    main()


From gallium.arsenide at gmail.com  Tue May  5 23:16:41 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Tue, 5 May 2009 20:16:41 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>
Message-ID: <3d167fe3-da37-4d1e-a43a-832819a0e405@h23g2000vbc.googlegroups.com>

On May 5, 10:49?am, Ross <ross.j... at gmail.com> wrote:
> I'm interested to see what you did. From your description,
> it sounds like I've tried what you've done, but when I
> implemented my version, it took minutes to evaluate for
> bigger numbers. If that isn't the case with yours, I'd be
> interested in seeing your implementation.

I don't know how big your "bigger numbers" are, but this should run in
a reasonable time.  It helps if you are using Python 2.6.  If not, you
should go on-line to the itertools docs to get the pure-Python
equivalent for itertools.combinations.

Since no matches are "thrown away", the byes are expressed simply as a
list of players that have to sit out for the week.

A couple of the lines are on the longish side, so beware of wrapping
from the browser/newsreader.

# Let's just try choosing from the possible combinations, each week
# scheduling those who have played the least or waited the longest.

import itertools

class Player(object):
    def __init__(self, id):
        self.id = id
        self.played = []
        self.latency = 0

    def __str__(self):
        str(self.id)

    def __cmp__(self, other):
        if len(self.played) != len(other.played):
            return len(self.played) - len(other.played)
        return other.latency - self.latency # select longer latency
first

def flattened(listOfLists):
    return list(itertools.chain(*listOfLists))

def pairings(players):
    idlist = range(players)
    playerlist = [Player(i) for i in idlist]
    matchlist = list(itertools.combinations(idlist, 2))
    while matchlist:
        found = False
        playerlist.sort()
        for i in range(players - 1):
            for j in range(i + 1, players):
                candidate = tuple(sorted((playerlist[i].id, playerlist
[j].id)))
                if candidate in matchlist:
                    yield matchlist.pop(matchlist.index(candidate))
                    for p in playerlist:
                        if p.id == candidate[0]:
                            p.played.append(candidate[1])
                            p.latency = 0
                        elif p.id == candidate[1]:
                            p.played.append(candidate[0])
                            p.latency = 0
                        else:
                            p.latency += 1
                    found = True
                    break
            if found: break

def schedule(players, weeks, courts):
    playerlist = range(players)
    matchlist = list(pairings(players))
    cap = min(courts, players // 2)
    start = 0
    for week in range(weeks):
        matches = matchlist[start:start + cap]
        byes = set(playerlist) - set(flattened(matches))
        print matches, list(byes)
        start += cap


From namekuseijin at gmail.com  Tue May  5 23:17:28 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Wed, 6 May 2009 00:17:28 -0300
Subject: yet another list comprehension question
In-Reply-To: <4A005757.7050405@gmail.com>
References: <594765c1-e5ed-492d-b398-a8ad00c6d6ad@x6g2000vbg.googlegroups.com>
	<gtm1ik$19tj$1@adenine.netfront.net>
	<mailman.5039.1241439352.11746.python-list@python.org>
	<f0b70e0d-31c2-4d95-bec4-0e57e5d3a860@o14g2000vbo.googlegroups.com>
	<4A005757.7050405@gmail.com>
Message-ID: <67d0527e0905052017v7ede4c6akd87e41d77bd8ebcd@mail.gmail.com>

2009/5/5 Ricardo Ar?oz <ricaraoz at gmail.com>:
> This seems to work for any length tuples :
>
>>>> a = [(1,2), (3,4, 'goes'), (5,None), (6,7, 8, 'as', None), (8, None),
>>>> (9, 0)]
>>>> [tup for tup in a if not [e for e in tup if e == None]]
> [(1, 2), (3, 4, 'goes'), (9, 0)]

Why that extra "for"?  KISS

>>> a = [(1,2), (3,4, 'goes'), (5,None), (6,7, 8, 'as', None), (8, None), (9, 0)]
[(1, 2), (3, 4, 'goes'), (5, None), (6, 7, 8, 'as', None), (8, None), (9, 0)]
>>> [t for t in a if None not in t]
[(1, 2), (3, 4, 'goes'), (9, 0)]

"in" works perfectly well for any sequence, including strings.


From wuwei23 at gmail.com  Tue May  5 23:36:37 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 5 May 2009 20:36:37 -0700 (PDT)
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com> 
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com> 
	<mailman.5115.1241546468.11746.python-list@python.org>
Message-ID: <a7974919-a216-42a8-bcb8-a57310501e85@z16g2000prd.googlegroups.com>

On May 6, 4:01?am, "J. Cliff Dyer" <j... at sdf.lonestar.org> wrote:
> The way you have to bounce your eyes back and forth in the comprehension
> makes it hard to read the logic. ?With the loop, on the other hand it is
> blatantly obvious which way the nesting occurs.

> > >>>> [ item for j in a if len(j)==2 for item in j if item % 2 ]
> > > ...opposed to...
> > >>>> for j in a:
> > > ... ? ? if len(j)==2:
> > > ... ? ? ? ? for item in j:
> > > ... ? ? ? ? ? ? if item % 2:
> > > ... ? ? ? ? ? ? ? ? b.append(item)
> > > ...

> Much nicer. ?Thank you.

Apart from the presence of 'item' at the beginning of the list
comprehension as opposed to 'b.append(item)' at the end of the for-
loop, how exactly does the listcomp force you to "bounce [..] back and
forth" to follow the logic? The only other difference between the two
is in the layout - the indentation & colons - otherwise they're
structurally identical.


From ross.jett at gmail.com  Tue May  5 23:37:37 2009
From: ross.jett at gmail.com (Ross)
Date: Tue, 5 May 2009 20:37:37 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
Message-ID: <cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>

On May 5, 10:33?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> Ross wrote:
> > On May 5, 12:32 am, John Yeung <gallium.arsen... at gmail.com> wrote:
> >> On May 5, 1:12 am, John Yeung <gallium.arsen... at gmail.com> wrote:
>
> >>> [...] the problem may require bigger guns (either much better
> >>> math or much more sophisticated programming).
> >> Yes, I'm responding to myself.
>
> >> Well, I went ahead with the approach I mentioned earlier, generating
> >> all possible matches and then selecting among them as needed to fill
> >> up the courts, trying to keep the number of matches played by each
> >> player as fair as possible. ?(I should mention that this, or something
> >> similar, was suggested earlier by someone else in a different thread,
> >> in response to the same question by the same OP.)
>
> >> I did use "bigger guns" (mainly a class for player objects, with
> >> custom __cmp__ method), but still didn't do anything with doubles.
>
> >> I haven't tested it much, but I'll post it if anyone's interested.
> >> (That way people can pick on me instead of the OP. ;)
>
> >> John
>
> > I'm interested to see what you did. From your description, it sounds
> > like I've tried what you've done, but when I implemented my version,
> > it took minutes to evaluate for bigger numbers. If that isn't the case
> > with yours, I'd be interested in seeing your implementation.
>
> Here's my approach (incomplete):
>
> def get_pair(player_list, played):
> ? ? ?for first in range(len(player_list)):
> ? ? ? ? ?player_1 = player_list[first]
> ? ? ? ? ?for second in range(first + 1, len(player_list)):
> ? ? ? ? ? ? ?player_2 = player_list[second]
> ? ? ? ? ? ? ?pair = player_1, player_2
> ? ? ? ? ? ? ?sorted_pair = tuple(sorted(pair))
> ? ? ? ? ? ? ?if sorted_pair not in played:
> ? ? ? ? ? ? ? ? ?played.add(sorted_pair)
> ? ? ? ? ? ? ? ? ?del player_list[second]
> ? ? ? ? ? ? ? ? ?del player_list[first]
> ? ? ? ? ? ? ? ? ?return pair
> ? ? ?return None
>
> def round_robin(player_list, courts, played):
> ? ? ?playing = []
> ? ? ?for c in range(courts):
> ? ? ? ? ?pair = get_pair(player_list, played)
> ? ? ? ? ?if pair is None:
> ? ? ? ? ? ? ?break
> ? ? ? ? ?playing.append(pair)
> ? ? ?byes = player_list[:]
> ? ? ?player_list[:] = byes + [player for pair in playing for player in pair]
> ? ? ?yield playing, byes
>
> def test_round_robin(players, rounds, courts, doubles=False):
> ? ? ?player_list = range(players)
> ? ? ?played = set()
> ? ? ?for r in range(rounds):
> ? ? ? ? ?for playing, byes in round_robin(player_list, courts, played):
> ? ? ? ? ? ? ?print playing, byes

FYI... I was testing your code further and discovered a strange
outcome... when there are 16 people for 7 courts, every 7th round your
code produces 4 byes instead of the correct 2 byes.


From lrhazi at gmail.com  Tue May  5 23:43:25 2009
From: lrhazi at gmail.com (Mohamed Lrhazi)
Date: Tue, 5 May 2009 23:43:25 -0400
Subject: pyc files problem
Message-ID: <c4ab18df0905052043s5a2d4cbena7888fa4fcea366@mail.gmail.com>

Hello,

My code sends a pointer to a Python function to a C library, using
ctypes module. When my program restarts, after a crash or normal
exit... it cannot start again without sigfaulting

What is the proper way around this problem? other than adding code to
delete the cache files?

Thanks a lot,
Mohamed.


From campanha1 at dnsreverso.com  Tue May  5 23:46:12 2009
From: campanha1 at dnsreverso.com (Cursos)
Date: Wed, 6 May 2009 03:46:12 GMT
Subject: Curso de Excel
Message-ID: <20090506034824.5D8B91FF21C5@out19.dnsreverso.com>

An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20090506/801f15e3/attachment-0001.html>

From gagsl-py2 at yahoo.com.ar  Tue May  5 23:59:59 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 06 May 2009 00:59:59 -0300
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
Message-ID: <op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 05 May 2009 22:35:08 -0300, Rhodri James  
<rhodri at wildebst.demon.co.uk> escribi?:
> On Tue, 05 May 2009 21:43:16 +0100, <bearophileHUGS at lycos.com> wrote:
>> wolfram.hinde...:

>>> It is easy to change all references of the function name, except for
>>> those in the function body itself? That needs some explantation.
>>
>> I can answer this. If I have a recursive function, I may want to
>> create a similar function, so I copy and paste it, to later modify the
>> copied version. Then to change its name I usually don't use a search &
>> rename of its name into its block of code because it's usually
>> useless. In non-recursive functions the name of the function is stated
>> only once, at the top.
>
> I'm sorry, but while I'm mildly positive towards the proposal (and more
> so towards Aaron's decorator), I don't buy this argument at all.  What
> is broken about your editor's global search-and-replace function that
> makes it "usually useless" for making these name changes?

It happened to me sometimes. If a module defines some functions, and it  
doesn't *use* them, why should I use a global search-and-replace to rename  
something? Modifying the "def" line should be enough - unless the function  
happens to be recursive.

It's the DRY principle in action, the same argument as when decorators  
where introduced: there should be no need to repeat the function name  
again and again.

-- 
Gabriel Genellina



From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 00:10:32 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 06 May 2009 04:10:32 GMT
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5115.1241546468.11746.python-list@python.org>
	<a7974919-a216-42a8-bcb8-a57310501e85@z16g2000prd.googlegroups.com>
Message-ID: <pan.2009.05.06.04.10.31@REMOVE.THIS.cybersource.com.au>

On Tue, 05 May 2009 20:36:37 -0700, alex23 wrote:

> On May 6, 4:01?am, "J. Cliff Dyer" <j... at sdf.lonestar.org> wrote:
>> The way you have to bounce your eyes back and forth in the
>> comprehension makes it hard to read the logic. ?With the loop, on the
>> other hand it is blatantly obvious which way the nesting occurs.
> 
>> > >>>> [ item for j in a if len(j)==2 for item in j if item % 2 ]
>> > > ...opposed to...
>> > >>>> for j in a:
>> > > ... ? ? if len(j)==2:
>> > > ... ? ? ? ? for item in j:
>> > > ... ? ? ? ? ? ? if item % 2:
>> > > ... ? ? ? ? ? ? ? ? b.append(item) ...
> 
>> Much nicer. ?Thank you.
> 
> Apart from the presence of 'item' at the beginning of the list
> comprehension as opposed to 'b.append(item)' at the end of the for-
> loop, how exactly does the listcomp force you to "bounce [..] back and
> forth" to follow the logic? The only other difference between the two is
> in the layout - the indentation & colons - otherwise they're
> structurally identical.


It's precisely the indentation and colons (plus newlines) that makes 
nested for-loops easier to read than list-comps with multiple fors.

for a in alist:
    for b in blist:
        for c in clist:
            if c:
                parrot(a, b, c)


is much easier to read than the equivalent one-liner:

[parrot(a, b, c) for a in alist for b in blist for c in clist if c]

You can get back *nearly* all the readability by splitting the list comp 
into multiple lines:

[parrot(a, b, c) 
    for a in alist 
      for b in blist
        for c in clist if c
]



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 00:18:03 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 06 May 2009 04:18:03 GMT
Subject: pyc files problem
References: <mailman.5136.1241581408.11746.python-list@python.org>
Message-ID: <pan.2009.05.06.04.18.02@REMOVE.THIS.cybersource.com.au>

On Tue, 05 May 2009 23:43:25 -0400, Mohamed Lrhazi wrote:

> Hello,
> 
> My code sends a pointer to a Python function to a C library, using
> ctypes module. When my program restarts, after a crash or normal exit...
> it cannot start again without sigfaulting
> 
> What is the proper way around this problem? other than adding code to
> delete the cache files?


Surely the proper way to solve this is to find the cause of the segfault, 
and fix that bug.



-- 
Steven


From gallium.arsenide at gmail.com  Wed May  6 00:36:12 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Tue, 5 May 2009 21:36:12 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
Message-ID: <e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com>

On May 5, 11:37?pm, Ross <ross.j... at gmail.com> wrote:

> On May 5, 10:33?am, MRAB <goo... at mrabarnett.plus.com> wrote:
>
> > Here's my approach (incomplete):
>
> FYI... I was testing your code further and discovered a strange
> outcome... when there are 16 people for 7 courts, every 7th
> round your code produces 4 byes instead of the correct 2 byes.

Well, MRAB did say his was incomplete, and it's significantly shorter
and cleaner than mine.

Mine has even weirder-looking behavior at 16 players on 7 courts, but
I think it's because mine tries harder to keep things balanced.  After
a few rounds, the inequalities start to build up, and my routine picks
some people more often to "catch up", but it doesn't prevent the same
person from being scheduled for multiple matches the same week.  There
may also be other, more subtle ways mine is broken.

It also may be that the problem is inherently unsolvable for some
values.  (I'm still waiting for someone with sufficient math ability
to swoop in and either provide a way that works for all values, or
confirm that there are just some unavoidable pathological cases.)

John


From tjreedy at udel.edu  Wed May  6 00:42:34 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 06 May 2009 00:42:34 -0400
Subject: list comprehension question
In-Reply-To: <pan.2009.05.06.01.52.24@REMOVE.THIS.cybersource.com.au>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>	<49FB2225.4030601@councilforeconed.org>
	<49FB2AA7.6020403@snet.net>	<mailman.5113.1241545418.11746.python-list@python.org>
	<pan.2009.05.06.01.52.24@REMOVE.THIS.cybersource.com.au>
Message-ID: <gtr4fr$l9i$3@ger.gmane.org>

Steven D'Aprano wrote:
> On Tue, 05 May 2009 13:43:32 -0400, J. Cliff Dyer wrote:

> Except for the ones that it doesn't cover, like strings:
> 
>>>> hasattr('abcd', '__iter__')
> False

True in Python3



From gagsl-py2 at yahoo.com.ar  Wed May  6 00:58:08 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 06 May 2009 01:58:08 -0300
Subject: pyc files problem
References: <c4ab18df0905052043s5a2d4cbena7888fa4fcea366@mail.gmail.com>
Message-ID: <op.uthr26pwx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 06 May 2009 00:43:25 -0300, Mohamed Lrhazi <lrhazi at gmail.com>  
escribi?:

> My code sends a pointer to a Python function to a C library, using
> ctypes module. When my program restarts, after a crash or normal
> exit... it cannot start again without sigfaulting

Do you mean that, if you delete the .pyc files your program runs properly,  
but if you keep the .pyc files your program crashes?
That's very strange...

> What is the proper way around this problem? other than adding code to
> delete the cache files?

There is no "proper way around" the problem; it should not exist in the  
first place!

Have you read the note at the end of the "Callback" section in the ctypes  
documentation?
"""Important note for callback functions:

Make sure you keep references to CFUNCTYPE objects as long as they are  
used from C code. ctypes doesn't, and if you don't, they may be garbage  
collected, crashing your program when a callback is made."""

There is a ctypes-specific list:  
https://lists.sourceforge.net/lists/listinfo/ctypes-users

-- 
Gabriel Genellina



From ganesh.gbg at gmail.com  Wed May  6 01:17:35 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Tue, 5 May 2009 22:17:35 -0700 (PDT)
Subject: problem in using sendmail in multi thread
References: <343747e9-549f-4336-9b15-522411a785a3@x1g2000prh.googlegroups.com>
	<m2zldrms9p.fsf@cs.uu.nl>
Message-ID: <f2453be6-12f3-4afd-be46-df6a3017fd0d@j18g2000prm.googlegroups.com>

On May 5, 9:25?pm, Piet van Oostrum <p... at cs.uu.nl> wrote:
> >>>>> gganesh <ganesh.... at gmail.com> (g) wrote:
> >g> hi,
> >g> I'm a beginner in using Python script
> >g> I'm trying to send mails using multi-thread
> >g> I wrote
> >g> FROM = 'ganeshx... at xxxx.com'
> >g> # for more mail add';' the another mail id
> >g> listTo = ['g.... at gmail.com', 'xxjango... at gmail.com',
> >g> 'xx... at yahoo.co.in']
> >g> SUBJECT = 'This is the subject'
> >g> MSGBODY = 'This the body of the message '
> >g> MAILSERVER = 'mail.xxxx.com'
> >g> port = 25
> >g> username = 'xxxxx'
> >g> password = 'xxxxx'
> >g> # trim the strings of any leading or trailing spaces
> >g> FROM = FROM.strip()
> >g> SUBJECT = SUBJECT.strip()
> >g> MSGBODY = MSGBODY.strip()
> >g> MAILSERVER = MAILSERVER.strip()
> >g> username = username.strip()
> >g> password = password.strip()
> >g> #Connect to server
> >g> print 'Connecting to mail server ', MAILSERVER
> >g> try:
> >g> ? ? ? s = smtplib.SMTP(MAILSERVER,port)
>
> You can't have a single SMTP connection that's used in multiple threads.
> That is what causes the error. Each thread should have its own SMTP
> connection. So move this code (above and below) into the run() method.
>
> >g> ? ? ? print 'connected'
> >g> #s.set_debuglevel(1)
> >g> except:
> >g> ? ? ? ?print 'ERROR: Unable to connect to mail server', sys.exc_info ?()[0]
> >g> ? ? ? ?sys.exit(1)
> >g> #login to server
> >g> if password <> '':
> >g> ? ? ? print 'Logging into mail server'
>
> I think this try except block should be inside the if statement, i.e.
> indented 4 spaces.
>
> >g> try:
> >g> ? ? ? s.login(username,password)
> >g> except:
> >g> ? ? ? print 'ERROR: Unable to login to mail server', MAILSERVER
> >g> ? ? ? print 'Please recheck your password'
> >g> ? ? ? sys.exit(1)
> >g> #--------------------------------------------------
> >g> print "Starting Multi Thread Method"
> >g> class MyThread(Thread):
> >g> ? ? def __init__(self, site, s, FROM, MSGBODY):
> >g> ? ? ? ? Thread.__init__(self)
> >g> ? ? ? ? self.site = site
> >g> ? ? ? self.s=s
> >g> ? ? ? self.FROM=FROM
> >g> ? ? ? self.MSGBODY=MSGBODY
>
> You give the s (connection) here as a parameter, store it in self.s and
> never use that attribute.
>
> >g> ? ? def run(self):
> >g> ? ? ? print "running for %s " %self.site
> >g> ? ? ? s.sendmail(self.FROM, self.site, self.MSGBODY)
>
> Here you use the global s, not self.s
>
> As I said above you should do the SMTP connection setup, including the
> login, here, and store the connection either in self.s or in a local
> variable s in the method. As you don't use the s in another method, I
> think a local variable is better.
>
> >g> ? ? ? print "Emailed for ?site %s" %self.site
> >g> a= time.time()
> >g> threads = []
> >g> for site in listTo:
> >g> ? ? T = MyThread(site,s,FROM,MSGBODY)
> >g> ? ? threads.append(T)
> >g> ? ? T.start()
> >g> for i in threads:
> >g> ? ? i.join()
>
> Of course the next 2 lines should also be moved to run().
>
> >g> s.quit()
> >g> s.close()
> >g> print "Took %s seconds" %str(time.time()-a)
> >g> #-----------------------------------------------------
>
> --
> Piet van Oostrum <p... at cs.uu.nl>
> URL:http://pietvanoostrum.com[PGP 8DAE142BE17999C4]
> Private email: p... at vanoostrum.org


Thanks Everyone By your guidance the code worked fine
I can send mails in multi threaded environment.
Is this only way to send mails concurrently  or any other method
aviable?
regards
Ganesh









From gagsl-py2 at yahoo.com.ar  Wed May  6 01:18:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 06 May 2009 02:18:41 -0300
Subject: Cannot start a thread in atexit callback
References: <333edbe80905051952v56ced17cl5aaa4b04bb8d3120@mail.gmail.com>
Message-ID: <op.uths1ff7x6zn5v@lepton.softlabbsas.com.ar>

En Tue, 05 May 2009 23:52:25 -0300, Zac Burns <zac256 at gmail.com> escribi?:

> It seems that one cannot start a thread in an atexit callback.
>
> My use case is that I have a IO heavy callback that I want to run in a
> thread so that other callbacks can finish while it's doing it's thing
> to save on exit time.

Try creating the thread when the program begins, but locked. And release  
the lock when your programs is about to finish.

-- 
Gabriel Genellina



From research at johnohagan.com  Wed May  6 01:56:35 2009
From: research at johnohagan.com (John O'Hagan)
Date: Wed, 6 May 2009 05:56:35 +0000
Subject: object query assigned variable name?
Message-ID: <200905060556.35190.research@johnohagan.com>

On Tue, 5 May 2009, Sion Arrowsmith wrote:
> John O'Hagan  <research at johnohagan.com> wrote:
> >I can see that it's tantalizing, though, because _somebody_ must know
> > about the assignment; after all, we just executed it!
>
> Except we haven't, if we're talking about reporting from the
>
> object's __init__:
> >>> class Brian:
>
> ...     def __init__(self):
> ...         print "I'm Brian!"
> ...
>
> >>> l = []
> >>> l[1] = Brian()
>
> I'm Brian!
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> IndexError: list assignment index out of range
>
> (Yeah, I know that's a setitem call not an assignment. Point stands.
> It also demonstrates why the whole idea of "what name is a newly-
> created object assigned to" is broken.)

I guess what I meant was that if I type:

brian = Brian()

in the python shell and then hit return, it seems to me that _somewhere_ (in 
the interpreter? I have no idea how it's done) it must be written that the 
new Brian object will later be assigned the name "brian", even as the process 
of creating the instance begins. As you've just demonstrated, the actual 
assignment occurs afterwards.

But even if this is true I'm guessing it'd be black magic to get to it.

Regards,

John


From gallium.arsenide at gmail.com  Wed May  6 02:10:34 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Tue, 5 May 2009 23:10:34 -0700 (PDT)
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com> 
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com> 
	<mailman.5115.1241546468.11746.python-list@python.org>
	<a7974919-a216-42a8-bcb8-a57310501e85@z16g2000prd.googlegroups.com>
Message-ID: <9086e914-3875-491c-8c88-ae697157b40f@o27g2000vbd.googlegroups.com>

On May 5, 11:36?pm, alex23 <wuwe... at gmail.com> wrote:

> Apart from the presence of 'item' at the beginning of the
> list comprehension as opposed to 'b.append(item)' at the
> end of the for-loop, how exactly does the listcomp force
> you to "bounce [..] back and forth" to follow the logic?

It's precisely the fact that the item is at the beginning which is the
main instigator of the bounce.  To tranlate

  [f(x) for x in a]

into a loop, you start in the middle, work your way toward the right,
then bounce back to the left.

I think some of us, perhaps subconsciously, get used to reading that
small chunk on the right, then bouncing left.  See enough small, flat
LCs, and we may be conditioned to think that the general rule is to
start with that small chunk on the right and bounce left.

When confronted with a long, nested LC then, some of us have the
instinct to read the rightmost chunk, then bounce left to the next-
rightmost chunk, etc.

Essentially, if you see [B A] over and over and over again, when
finally confronted with LCs of more "elements", it's not immediately
clear that the pattern of increasing nestedness is

  [B A] => [C A B] => [D A B C] => etc.

rather than

  [B A] => [C B A] => [D C B A] => etc.

Maybe we're wired wrong, but there are many of us who find the second
pattern more logical, which is why it is so easy for us to mess up the
order of the nesting in a more complex LC.

John


From wuwei23 at gmail.com  Wed May  6 03:20:29 2009
From: wuwei23 at gmail.com (alex23)
Date: Wed, 6 May 2009 00:20:29 -0700 (PDT)
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com> 
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com> 
	<mailman.5115.1241546468.11746.python-list@python.org>
	<a7974919-a216-42a8-bcb8-a57310501e85@z16g2000prd.googlegroups.com>
	<pan.2009.05.06.04.10.31@REMOVE.THIS.cybersource.com.au>
Message-ID: <75f5e3c1-1c0b-4278-bf43-172676e7903b@s1g2000prd.googlegroups.com>

On May 6, 2:10?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> It's precisely the indentation and colons (plus newlines) that makes
> nested for-loops easier to read than list-comps with multiple fors.
>
> You can get back *nearly* all the readability by splitting the list comp
> into multiple lines:

It was less the overall readability I was commenting on, and more the
claim that the listcomp required a 'back-and-forth' parsing to
understand. As you've reinforced, the listcomp can be readily
converted back to the multiple-line form by the inclusion of colons &
EOL markers, which means you can make as much sequential sense from a
listcomp as you can a for-loop.


From arnodel at googlemail.com  Wed May  6 03:23:42 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Wed, 6 May 2009 00:23:42 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com> 
	<4a69c949-ace7-47d9-8bb7-d05bc6c895f3@s31g2000vbp.googlegroups.com> 
	<50222a39-88d0-49da-9105-2d3a47af5940@r34g2000vba.googlegroups.com> 
	<5b81cccc-c174-42bd-b4a0-638755ca9e03@l5g2000vbc.googlegroups.com>
Message-ID: <57b22b7c-1130-4f28-a7b7-bd119445de41@z19g2000vbz.googlegroups.com>

On May 5, 10:20?pm, Aaron Brady <castiro... at gmail.com> wrote:
> def auto( f ):
> ? ? def _inner( *ar, **kw ):
> ? ? ? ? return f( _inner, *ar, **kw )
> ? ? return _inner

Quoting myself near the start of this thread:

Here's an idea:
>>> def bindfunc(f):

...     def boundf(*args, **kwargs):
...         return f(boundf, *args, **kwargs)
...     return boundf


--
Arnaud


From Graham.Dumpleton at gmail.com  Wed May  6 03:26:07 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Wed, 6 May 2009 00:26:07 -0700 (PDT)
Subject: Cannot start a thread in atexit callback
References: <333edbe80905051952v56ced17cl5aaa4b04bb8d3120@mail.gmail.com> 
	<mailman.5141.1241587143.11746.python-list@python.org>
Message-ID: <2acc47dd-35c0-40fa-8d56-bc1a52c87cc6@s1g2000prd.googlegroups.com>

On May 6, 3:18?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Tue, 05 May 2009 23:52:25 -0300, Zac Burns <zac... at gmail.com> escribi?:
>
> > It seems that one cannot start a thread in an atexit callback.
>
> > My use case is that I have a IO heavy callback that I want to run in a
> > thread so that other callbacks can finish while it's doing it's thing
> > to save on exit time.
>
> Try creating the thread when the program begins, but locked. And release ?
> the lock when your programs is about to finish.

FWIW, from Python 2.5 (??) onwards, a shutdown of non daemonized
threads is performed as a separate step before atexit callbacks. Not
sure if other aspects of threading may be undone at that point and so
prevent startup of new ones.

The code in threading module which is called is:

class _MainThread(Thread):

    ...

    def _exitfunc(self):
        self._Thread__stop()
        t = _pickSomeNonDaemonThread()
        if t:
            if __debug__:
                self._note("%s: waiting for other threads", self)
        while t:
            t.join()
            t = _pickSomeNonDaemonThread()
        if __debug__:
            self._note("%s: exiting", self)
        self._Thread__delete()

_shutdown = _MainThread()._exitfunc

The call to this is done from WaitForThreadShutdown() in main.c. Which
is in turn called from Py_Main() just prior to calling Py_Finalize().

        WaitForThreadShutdown();

        Py_Finalize();

This is all different to older versions of Python which shutdown such
threads from an actual atexit handler. This caused various ordering
issues.

Anyway, the point of this is that it would need to be a daemonized
thread to begin with. :-)

Graham


From google at mrabarnett.plus.com  Wed May  6 03:29:41 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 06 May 2009 08:29:41 +0100
Subject: Code works fine except...
In-Reply-To: <e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com>
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>	<mailman.5023.1241407766.11746.python-list@python.org>	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com>
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com>
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com>
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com>
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com>
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com>
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com>
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>
	<mailman.5111.1241544824.11746.python-list@python.org>	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com>
Message-ID: <4A013C65.4020104@mrabarnett.plus.com>

John Yeung wrote:
> On May 5, 11:37 pm, Ross <ross.j... at gmail.com> wrote:
> 
>> On May 5, 10:33 am, MRAB <goo... at mrabarnett.plus.com> wrote:
>>
>>> Here's my approach (incomplete):
>> FYI... I was testing your code further and discovered a strange
>> outcome... when there are 16 people for 7 courts, every 7th
>> round your code produces 4 byes instead of the correct 2 byes.
> 
> Well, MRAB did say his was incomplete, and it's significantly shorter
> and cleaner than mine.
> 
> Mine has even weirder-looking behavior at 16 players on 7 courts, but
> I think it's because mine tries harder to keep things balanced.  After
> a few rounds, the inequalities start to build up, and my routine picks
> some people more often to "catch up", but it doesn't prevent the same
> person from being scheduled for multiple matches the same week.  There
> may also be other, more subtle ways mine is broken.
> 
> It also may be that the problem is inherently unsolvable for some
> values.  (I'm still waiting for someone with sufficient math ability
> to swoop in and either provide a way that works for all values, or
> confirm that there are just some unavoidable pathological cases.)
> 
I'm not sure that all the requirements can be met.

I have the feeling that if the number of rounds is restricted then the
difference between the minimum and maximum number of byes could be 2
because of the requirement that players shouldn't play each other more
than once, meaning that the players have to be shuffled around a bit, so
a player might play a week earlier or later than would otherwise be the
case.

If every possible combination is done (everyone plays everyone else)
then the number of byes would be the same for all, otherwise the
difference could be 2, not 1. I think! :-)


From CKurtM at gmail.com  Wed May  6 04:38:16 2009
From: CKurtM at gmail.com (CkurtM)
Date: Wed, 6 May 2009 01:38:16 -0700 (PDT)
Subject: Pybuez Client sending messages to j2me Server
Message-ID: <5858a389-7b9f-4f29-848a-1ef80861c8ad@m24g2000vbp.googlegroups.com>

I have a problem with recieving requests on j2me based bluetooth
server using RFCOMM. I can send messages from the j2me client to
python server, but cant receive from the python bluetooth client to
j2me server, it only connects but doesnt receive??.I can send copy of
code on request.
I'm using pybluez on python 2.6
and standard javax.bluetooth for the mobile interface. Any help wud be
welcome.
Thanks in advance.


From R.Brodie at rl.ac.uk  Wed May  6 04:45:24 2009
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Wed, 6 May 2009 09:45:24 +0100
Subject: thc v0.3 - txt to html converter - better code?
References: <gtppqc$7v1$1@news-cedar.fernuni-hagen.de>
	<4a008996$0$31862$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <gtrin4$7h5$1@south.jnrs.ja.net>


"Stefan Behnel" <stefan_ml at behnel.de> wrote in message 
news:4a008996$0$31862$9b4e6d93 at newsspool3.arcor-online.net...

>    language_map = {'English': 'EN', 'Deutsch': 'DE'}
>    strict_or_transitional = {True: 'Transitional', False: 'Strict'}
>
>    # this will raise a KeyError for unknown languages
>    language = language_map[ self.cmboBoxLang.currentText() ]
>
>    # this assumes that isChecked() returns True or False
>    spec = strict_or_transitional[self.rdioBtnTransitional.isChecked()]
>
>    doctype = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 %s/%s">\n' % (
>        spec, language)

Incidentally, the language in an HTML DOCTYPE refers to the language of the DTD, not
the document. It's never correct to use //DE in an HTML page, unless you have a custom
(German) DTD. So the code can be improved further by cutting that part out.

    strict_or_transitional = {True: 'Transitional', False: 'Strict'}

    # this assumes that isChecked() returns True or False
    spec = strict_or_transitional[self.rdioBtnTransitional.isChecked()]

    doctype = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 %s//EN">\n' % spec




From digitig at gmail.com  Wed May  6 04:46:43 2009
From: digitig at gmail.com (Tim Rowe)
Date: Wed, 6 May 2009 09:46:43 +0100
Subject: Which one is best Python or Java for developing GUI applications?
In-Reply-To: <gtreu8$f64$1@ger.gmane.org>
References: <793408.86105.qm@web7903.mail.in.yahoo.com>
	<gtreu8$f64$1@ger.gmane.org>
Message-ID: <aee48b3c0905060146t3ada829eucfc0d79cc8be9c67@mail.gmail.com>

2009/5/6 Dennis Lee Bieber <wlfraed at ix.netcom.com>:

> (the "near" is because I feel Ada is
> stricter than any other language)

Try SPARK -- it's Ada based, but /much/ stricter. It's just right for
some really critical stuff, but is no sort of an answer to "Which one
is best Python or Java for developing GUI"!

-- 
Tim Rowe


From paul.sijben at xs4all.nl  Wed May  6 04:51:34 2009
From: paul.sijben at xs4all.nl (Paul Sijben)
Date: Wed, 06 May 2009 10:51:34 +0200
Subject: desperately looking for a howto on running my wxPython app on
	Vista
In-Reply-To: <1f97707a-9fd8-45d0-8aa6-142ce16b1951@e24g2000vbe.googlegroups.com>
References: <49f6d607$0$199$e4fe514c@news.xs4all.nl>
	<mailman.4711.1240940347.11746.python-list@python.org>
	<mailman.4750.1240996642.11746.python-list@python.org>
	<fb1229dc-1fd9-49c7-8b21-5c4326b53c93@u39g2000pru.googlegroups.com>
	<4A006CCD.5060901@xs4all.nl>
	<1f97707a-9fd8-45d0-8aa6-142ce16b1951@e24g2000vbe.googlegroups.com>
Message-ID: <4A014F96.5090004@xs4all.nl>

Mike Driscoll wrote:
> 
> 
> Hmmm...I'm not familiar with that DLL, but a little googling seems to
> indicate that you may be able to get it off your installation CD:

it actually is there on my system. So this may be the red herring the
Dependency Walker FAQ is warning for....

maybe I should leave this mess and revert to python 2.5....

> 
> http://www.techimo.com/forum/applications-operating-systems/76550-winxp-msgina-dll-shlwapi-dll-problem.html
> 
> The link above gives the steps for XP, but Vista will probably be
> similar. I don't know for sure, but you may have to register the dll
> once you've got it copied back onto your machine.
> 
> Mike


From davea at ieee.org  Wed May  6 04:57:00 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 06 May 2009 04:57:00 -0400
Subject: pyc files problem
In-Reply-To: <op.uthr26pwx6zn5v@lepton.softlabbsas.com.ar>
References: <c4ab18df0905052043s5a2d4cbena7888fa4fcea366@mail.gmail.com>
	<op.uthr26pwx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4A0150DC.5050909@ieee.org>

Gabriel Genellina wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">En Wed, 
> 06 May 2009 00:43:25 -0300, Mohamed Lrhazi <lrhazi at gmail.com> escribi?:
>
>> My code sends a pointer to a Python function to a C library, using
>> ctypes module. When my program restarts, after a crash or normal
>> exit... it cannot start again without sigfaulting
>
> Do you mean that, if you delete the .pyc files your program runs 
> properly, but if you keep the .pyc files your program crashes?
> That's very strange...
>
>> What is the proper way around this problem? other than adding code to
>> delete the cache files?
>
> There is no "proper way around" the problem; it should not exist in 
> the first place!
>
> Have you read the note at the end of the "Callback" section in the 
> ctypes documentation?
> """Important note for callback functions:
>
> Make sure you keep references to CFUNCTYPE objects as long as they are 
> used from C code. ctypes doesn't, and if you don't, they may be 
> garbage collected, crashing your program when a callback is made."""
>
> There is a ctypes-specific list: 
> https://lists.sourceforge.net/lists/listinfo/ctypes-users
>
1) Is it true (as Gabriel asks) that deleting the .pyc files solves the 
problem?
2) If so, have you investigated to see which one of them gets 
corrupted?  This isn't necessarily the problem, it could also be timing, 
or related to the order of the memory allocation pool.
3) When you get the segment fault, what does you C debugger show?  
What's happening at the time of the crash?
4) Is either the C code or the Python code multithreaded?
5) Are you running it under a Python debugger?



From rschroev_nospam_ml at fastmail.fm  Wed May  6 05:26:25 2009
From: rschroev_nospam_ml at fastmail.fm (Roel Schroeven)
Date: Wed, 06 May 2009 11:26:25 +0200
Subject: list comprehension question
In-Reply-To: <9086e914-3875-491c-8c88-ae697157b40f@o27g2000vbd.googlegroups.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5115.1241546468.11746.python-list@python.org>
	<a7974919-a216-42a8-bcb8-a57310501e85@z16g2000prd.googlegroups.com>
	<9086e914-3875-491c-8c88-ae697157b40f@o27g2000vbd.googlegroups.com>
Message-ID: <5JcMl.11662$5S3.7978@newsfe05.ams2>

John Yeung schreef:
> Essentially, if you see [B A] over and over and over again, when
> finally confronted with LCs of more "elements", it's not immediately
> clear that the pattern of increasing nestedness is
> 
>   [B A] => [C A B] => [D A B C] => etc.
> 
> rather than
> 
>   [B A] => [C B A] => [D C B A] => etc.
> 
> Maybe we're wired wrong, but there are many of us who find the second
> pattern more logical, which is why it is so easy for us to mess up the
> order of the nesting in a more complex LC.

Indeed, that is exactly the reason why I find it difficult to read
nested loop comprehensions, and why I almost never use them.

-- 
The saddest aspect of life right now is that science gathers knowledge
faster than society gathers wisdom.
  -- Isaac Asimov

Roel Schroeven


From sasurve at gmail.com  Wed May  6 05:53:21 2009
From: sasurve at gmail.com (shruti surve)
Date: Wed, 6 May 2009 15:23:21 +0530
Subject: About ODFPY links
Message-ID: <862e00220905060253j290672acu86f18fc1bcd6bb2a@mail.gmail.com>

hey all,
 For my project, i am using ODFpy open office spreadsheets. I am creating
ledgers in python ie.ledger.py.  So when i run ledger.py, spreadsheet will
be opened in open office. since ledger is made of number of accounts, i am
creating multiple tables for all accounts in single spreadsheet. So, there
are number of tables in one spreadsheet.  Now i want create links in each
table of spreadsheet so that i can connect multiple tables. SO can anyone
please tell me how to create links in odfpy..
-------------- next part --------------
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From Lacrima.Maxim at gmail.com  Wed May  6 06:08:08 2009
From: Lacrima.Maxim at gmail.com (Lacrima)
Date: Wed, 6 May 2009 03:08:08 -0700 (PDT)
Subject: Checking for required arguments when instantiating class.
Message-ID: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>

Hello!

For example I have two classes:

>>> class First:
	def __init__(self, *args, **kwargs):
		pass

>>> class Second:
	def __init__(self, somearg, *args, **kwargs):
		self.somearg = somearg

How can I test that First class takes 1 required argument and Second
class takes no required arguments?
So that I could instantiate them in a for loop.

>>> a = [First, Second]
>>> for cls in a:
	instance = cls()

Traceback (most recent call last):
  File "<pyshell#22>", line 2, in <module>
    instance = cls()
TypeError: __init__() takes at least 2 arguments (1 given)

Of course, I can do like this:
>>> for cls in a:
	try:
		instance = cls()
	except TypeError:
		instance = cls('hello')

>>> print instance.somearg
hello

But what if I have to instantiate any class with 3 or 4 required
arguments? How can I do it?

With regards,
Max


From Lacrima.Maxim at gmail.com  Wed May  6 06:11:58 2009
From: Lacrima.Maxim at gmail.com (Lacrima)
Date: Wed, 6 May 2009 03:11:58 -0700 (PDT)
Subject: Checking for required arguments when instantiating class.
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
Message-ID: <7c16b282-298a-4593-9872-bc63d6edff15@t11g2000vbc.googlegroups.com>

> >>> class First:
>
> ? ? ? ? def __init__(self, *args, **kwargs):
> ? ? ? ? ? ? ? ? pass
>
> >>> class Second:
>
> ? ? ? ? def __init__(self, somearg, *args, **kwargs):
> ? ? ? ? ? ? ? ? self.somearg = somearg
>
> How can I test that First class takes 1 required argument and Second
> class takes no required arguments?


Sorry, I have made a mistake. Of course, Second class takes 1 required
argument, not First.


From marco at sferacarta.com  Wed May  6 06:21:45 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Wed, 06 May 2009 12:21:45 +0200
Subject: what's the best way to call a method of object without a guarantee
	of its existence
In-Reply-To: <0348bb8e-3c1a-410d-a886-352b9b0ae391@e23g2000vbe.googlegroups.com>
References: <22690572-e338-483a-a99a-85ccf6c5fae6@x6g2000vbg.googlegroups.com>
	<9uULl.4199$Ux.2825@tornado.fastwebnet.it>
	<0348bb8e-3c1a-410d-a886-352b9b0ae391@e23g2000vbe.googlegroups.com>
Message-ID: <1xdMl.5391$Ux.3483@tornado.fastwebnet.it>

Leon wrote:

> So I need to go back to the module including "parent" class
> to define the objects that I maybe use in future as None,

You can assign them to a placeholder, with a method that always exists 
but does nothing.

class NullObject(object):
     def method(self, *args, **kw):
         pass


> actually, the module including "parent' class works very well
> without those definitions, from parent class's point of view,
> those definitions are kind of noisy.

If you don't feel the need to define the instances there, maybe they 
don't belong to that class after all.




From clp2 at rebertia.com  Wed May  6 06:28:53 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 6 May 2009 03:28:53 -0700
Subject: Checking for required arguments when instantiating class.
In-Reply-To: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
Message-ID: <50697b2c0905060328g3c3557cbw3fecc2b8b65b8f8e@mail.gmail.com>

On Wed, May 6, 2009 at 3:08 AM, Lacrima <Lacrima.Maxim at gmail.com> wrote:
> Hello!
>
> For example I have two classes:
>
>>>> class First:
> ? ? ? ?def __init__(self, *args, **kwargs):
> ? ? ? ? ? ? ? ?pass
>
>>>> class Second:
> ? ? ? ?def __init__(self, somearg, *args, **kwargs):
> ? ? ? ? ? ? ? ?self.somearg = somearg
>
> How can I test that First class takes 1 required argument and Second
> class takes no required arguments?

import inspect
args, varargs, varkw, defaults = inspect.getargspec(klass)
num_args_reqd = len(args) - (0 if defaults is None else len(defaults))

However, it sounds like a code smell that you're instanciating unknown
classes that don't share a common constructor signature.

Cheers,
Chris
-- 
http://blog.rebertia.com


From sion at viridian.paintbox  Wed May  6 06:32:40 2009
From: sion at viridian.paintbox (Sion Arrowsmith)
Date: Wed, 06 May 2009 10:32:40 GMT
Subject: object query assigned variable name?
References: <mailman.5142.1241589396.11746.python-list@python.org>
Message-ID: <cHdMl.15285$iK7.190@newsfe08.ams2>

John O'Hagan  <research at johnohagan.com> wrote:
>I guess what I meant was that if I type:
>
>brian = Brian()
>
>in the python shell and then hit return, it seems to me that _somewhere_ (in 
>the interpreter? I have no idea how it's done) it must be written that the 
>new Brian object will later be assigned the name "brian", even as the process 
>of creating the instance begins. As you've just demonstrated, the actual 
>assignment occurs afterwards.

As far as CPython goes, the parser (presumably) knows, but the
bytecode interpreter doesn't (without looking ahead), and you
can't assume you've got anything more than the bytecode.

This is what I should've done in the first place:

>>> def f():
...     messiah = Brian()
...
>>> import dis
>>> dis.dis(f)
  2           0 LOAD_GLOBAL              0 (Brian)
              3 CALL_FUNCTION            0
              6 STORE_FAST               0 (messiah)
              9 LOAD_CONST               0 (None)
             12 RETURN_VALUE
>>>

So while the information might be there, I'm not sure how you
could make use of it without going into bytecodehacks territory.

-- 
\S

   under construction



From lie.1296 at gmail.com  Wed May  6 06:51:47 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 06 May 2009 10:51:47 GMT
Subject: Checking for required arguments when instantiating class.
In-Reply-To: <7c16b282-298a-4593-9872-bc63d6edff15@t11g2000vbc.googlegroups.com>
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
	<7c16b282-298a-4593-9872-bc63d6edff15@t11g2000vbc.googlegroups.com>
Message-ID: <7ZdMl.9024$y61.7026@news-server.bigpond.net.au>

Lacrima wrote:
>>>>> class First:
>>         def __init__(self, *args, **kwargs):
>>                 pass
>>
>>>>> class Second:
>>         def __init__(self, somearg, *args, **kwargs):
>>                 self.somearg = somearg
>>
>> How can I test that First class takes 1 required argument and Second
>> class takes no required arguments?
> 
> 
> Sorry, I have made a mistake. Of course, Second class takes 1 required
> argument, not First.

Of course, it is possible to just try it one-by-one with a try block and 
a while loop (as long as your class/function doesn't rely/change on some 
global state (e.g. files, global variable, GUI, etc) while 
initializing/called), but if you really need that, there is something 
seriously wrong with the class/function design. You should check the 
help and determine how many and what are all the arguments meant.

In case you're wondering, this is how it would look like:

 >>> def f0():
...     print
...
 >>> def f1(a):
...     print a
...
 >>> def f2(a, b):
...     print a, b
...
 >>> def f2a(a, b, *args, **kargs):
...     print a, b, args, kargs
...
 >>> import itertools
 >>> funclist = [f0, f1, f2, f2a]
 >>> for f in funclist:
...     for i in itertools.count():
...         try:
...             f(*range(i))
...         except TypeError:
...             pass
...         else:
...             print 'Function %s takes %s required arguments' % 
(f.__name__, i)
...             break
...

Function f0 takes 0 required arguments
0
Function f1 takes 1 required arguments
0 1
Function f2 takes 2 required arguments
0 1 () {}
Function f2a takes 2 required arguments
 >>>


From lie.1296 at gmail.com  Wed May  6 07:49:15 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 06 May 2009 11:49:15 GMT
Subject: Self function
In-Reply-To: <mailman.5100.1241526783.11746.python-list@python.org>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>	<50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com>
	<mailman.5100.1241526783.11746.python-list@python.org>
Message-ID: <%OeMl.9036$y61.4364@news-server.bigpond.net.au>

Luis Zarrabeitia wrote:
> Btw, is there any way to inject a name into a function's namespace? Following 
> the python tradition, maybe we should try to create a more general solution!

How about a mechanism to pass arguments that are optional to accept?

So (in the general case) the caller can call a function with certain 
arguments, but unless the function explicitly accept it, the argument 
will be discarded.

With this, the injecting a local would simply be a case of adding an "I 
accept the argument" statement.


Sort of like this:

def func():
     ''' I reject '''
     pass

func(@somearg='Feel free to accept this arg')

def func(@somearg):
     ''' I accept '''
     print(somearg)

func(@somearg='Feel free to accept this arg')


Then on the case of injecting locals is simply by wrapping the function 
with a function that will inject various argument to the function and 
the function selectively choose which arguments they want to accept.

def needinfo(f):
     # let's assume there is an inspect code here
     func(@__name__=yournameis,
          @__call__=yourfunction,
          @__code__=yourcode,
          @__yoursub__=youryo,
          @__yourlim__=yoururso,
          @__yourina__=yournisk,
          @__yourlmes__=youridna,
          @__yoursage__=yourpped
     )

@needinfo
def func(@__name__, @__call__):
     print 'Hi, my name is %s and to call me press %s' % (__name__, 
__call__)

Does it sounds like a feature smell?


From piet at cs.uu.nl  Wed May  6 07:57:26 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 06 May 2009 13:57:26 +0200
Subject: object query assigned variable name?
References: <mailman.5142.1241589396.11746.python-list@python.org>
Message-ID: <m263gemok9.fsf@cs.uu.nl>

>>>>> John O'Hagan <research at johnohagan.com> (JO) wrote:

>JO> I guess what I meant was that if I type:

>JO> brian = Brian()

>JO> in the python shell and then hit return, it seems to me that
>JO> _somewhere_ (in the interpreter? I have no idea how it's done) it
>JO> must be written that the new Brian object will later be assigned
>JO> the name "brian", even as the process of creating the instance
>JO> begins. As you've just demonstrated, the actual assignment occurs
>JO> afterwards.

No, that's not how it works. There is no `preparation' for the
assignment and there is no reason for it. Look at the generated
byte code for this Python code:

def test():
    class Brian:
        def __init__(self):
            print "I'm Brian!"
    brian = Brian()

2           0 LOAD_CONST               1 ('Brian')
              3 LOAD_CONST               3 (())
              6 LOAD_CONST               2 (<code object Brian at 0x35728, file "<stdin>", line 2>)
              9 MAKE_FUNCTION            0
             12 CALL_FUNCTION            0
             15 BUILD_CLASS         
             16 STORE_FAST               0 (Brian)

  5          19 LOAD_FAST                0 (Brian)
             22 CALL_FUNCTION            0
             25 STORE_FAST               1 (brian)
             28 LOAD_CONST               0 (None)
             31 RETURN_VALUE        

You can see that the assignment (STORE_FAST) is done after the method
call (CALL_FUNCTION) and there is no reference to the variable name
before the call.

If you do a parallel assignment the relationship becomes even less:

brian, test = Brian(), 1

  5          19 LOAD_FAST                0 (Brian)
             22 CALL_FUNCTION            0
             25 LOAD_CONST               3 (1)
             28 ROT_TWO             
             29 STORE_FAST               1 (brian)
             32 STORE_FAST               2 (test)

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From deets at nospam.web.de  Wed May  6 08:07:58 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 06 May 2009 14:07:58 +0200
Subject: Install Python 3.0 dmg to macos 10.5
References: <627526f7-ac27-4874-b234-13d1a13accf5@y33g2000prg.googlegroups.com>
Message-ID: <76dcpuF1cbhk2U1@mid.uni-berlin.de>

silverburgh wrote:

> Hi,
> 
> If I install python 3.0 dmg, will it wipe out the existing python
> installation on macos 10.5 (i don't know how the original python was
> installed ( i think it is version 2.5).

No. The original is under /System/Library/Frameworks/Python.framework (and
should be kept there & not touched), and other installs are
under /Library/Frameworks/Python.framework

Diez


From phd at phd.pp.ru  Wed May  6 08:09:13 2009
From: phd at phd.pp.ru (Oleg Broytmann)
Date: Wed, 6 May 2009 16:09:13 +0400
Subject: SQLObject 0.9.10
Message-ID: <20090506120913.GB15968@phd.pp.ru>

Hello!

I'm pleased to announce version 0.9.10, a minor bugfix release of 0.9 branch
of SQLObject.


What is SQLObject
=================

SQLObject is an object-relational mapper.  Your database tables are described
as classes, and rows are instances of those classes.  SQLObject is meant to be
easy to use and quick to get started with.

SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).


Where is SQLObject
==================

Site:
http://sqlobject.org

Development:
http://sqlobject.org/devel/

Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss

Archives:
http://news.gmane.org/gmane.comp.python.sqlobject

Download:
http://cheeseshop.python.org/pypi/SQLObject/0.9.10

News and changes:
http://sqlobject.org/News.html


What's New
==========

News since 0.9.9
----------------

* Another unicode-related patch for MySQL; required because different
  versions of MySQLdb require different handling::

   - MySQLdb < 1.2.1: only ascii
   - MySQLdb = 1.2.1: only unicode
   - MySQLdb > 1.2.1: both ascii and unicode

* Setup requires FormEncode version 1.1.1+.

* Fixed a minor bug - pass name to DecimalValidator.

* Fixed a bug in InheritableIteration - pass connection to child
  klass.select().

* A bug was fixed in PostgresConnection.columnsFromSchema() - foreign keys
  are now recognized and created as proper ForeignKey with correct
  column name and table name.

* Bugs in PostgresConnection and MSSQLConnection related to properties was
  fixed. A note for developers: from now on properties in DBConnection
  classes are forbidden as they don't work with Transaction -
  Transaction.__getattr__() cannot properly wrap 'self' so a property is
  called with wrong 'self'.

* Transaction instances now explicitly raises TypeError on close() -
  without this calling Transaction.close() calls connection.close() which
  is wrong.

* A bug in SQLiteConnection.columnsFromSchema() that led to an infinite
  loop was fixed.

For a more complete list, please see the news:
http://sqlobject.org/News.html

Oleg.
-- 
     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.


From phd at phd.pp.ru  Wed May  6 08:19:34 2009
From: phd at phd.pp.ru (Oleg Broytmann)
Date: Wed, 6 May 2009 16:19:34 +0400
Subject: SQLObject 0.10.5
Message-ID: <20090506121934.GF15968@phd.pp.ru>

Hello!

I'm pleased to announce version 0.10.5, a minor bugfix release of 0.10 branch
of SQLObject.


What is SQLObject
=================

SQLObject is an object-relational mapper.  Your database tables are described
as classes, and rows are instances of those classes.  SQLObject is meant to be
easy to use and quick to get started with.

SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).


Where is SQLObject
==================

Site:
http://sqlobject.org

Development:
http://sqlobject.org/devel/

Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss

Archives:
http://news.gmane.org/gmane.comp.python.sqlobject

Download:
http://cheeseshop.python.org/pypi/SQLObject/0.10.5

News and changes:
http://sqlobject.org/News.html


What's New
==========

News since 0.10.4
-----------------

* Another unicode-related patch for MySQL; required because different
  versions of MySQLdb require different handling::

   - MySQLdb < 1.2.1: only ascii
   - MySQLdb = 1.2.1: only unicode
   - MySQLdb > 1.2.1: both ascii and unicode

* Setup requires FormEncode version 1.1.1+.

* Fixed a minor bug - pass name to DecimalValidator.

* Fixed a bug in InheritableIteration - pass connection to child
  klass.select().

* sqlmeta.getColumns() becomes classmethod.

* A bug was fixed in PostgresConnection.columnsFromSchema() - foreign keys
  are now recognized and created as proper ForeignKey with correct
  column name and table name.

* Bugs in PostgresConnection and MSSQLConnection related to properties was
  fixed. A note for developers: from now on properties in DBConnection
  classes are forbidden as they don't work with Transaction -
  Transaction.__getattr__() cannot properly wrap 'self' so a property is
  called with wrong 'self'.

* Transaction instances now explicitly raises TypeError on close() -
  without this calling Transaction.close() calls connection.close() which
  is wrong.

* A bug in SQLiteConnection.columnsFromSchema() that led to an infinite
  loop was fixed.

For a more complete list, please see the news:
http://sqlobject.org/News.html

Oleg.
-- 
     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.


From piet at cs.uu.nl  Wed May  6 08:24:59 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 06 May 2009 14:24:59 +0200
Subject: Checking for required arguments when instantiating class.
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
Message-ID: <m21vr2mnac.fsf@cs.uu.nl>

>>>>> Lacrima <Lacrima.Maxim at gmail.com> (L) wrote:

>L> Hello!
>L> For example I have two classes:

>>>>> class First:
>L> 	def __init__(self, *args, **kwargs):
>L> 		pass

>>>>> class Second:
>L> 	def __init__(self, somearg, *args, **kwargs):
>L> 		self.somearg = somearg

>L> How can I test that First class takes 1 required argument and Second
>L> class takes no required arguments?
>L> So that I could instantiate them in a for loop.

>>>>> a = [First, Second]
>>>>> for cls in a:
>L> 	instance = cls()

>L> Traceback (most recent call last):
>L>   File "<pyshell#22>", line 2, in <module>
>L>     instance = cls()
>L> TypeError: __init__() takes at least 2 arguments (1 given)

>L> Of course, I can do like this:
>>>>> for cls in a:
>L> 	try:
>L> 		instance = cls()
>L> 	except TypeError:
>L> 		instance = cls('hello')

>>>>> print instance.somearg
>L> hello

>L> But what if I have to instantiate any class with 3 or 4 required
>L> arguments? How can I do it?

cls.__init__.im_func.__code__.co_argcount

This will include self, so it will be 1 in First and 2 in Second.

However this is very dirty trickery and should not be recommended. It
may also change in future versions and other implementations of Python.

I think it would be cleaner to put a class attribute in the classes that
defines how they should be initialized (e.g. just the number of required
arguments or more specific information) or have a special factory method
for this use case.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From clp2 at rebertia.com  Wed May  6 08:36:48 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 6 May 2009 05:36:48 -0700
Subject: Checking for required arguments when instantiating class.
In-Reply-To: <m21vr2mnac.fsf@cs.uu.nl>
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
	<m21vr2mnac.fsf@cs.uu.nl>
Message-ID: <50697b2c0905060536u4063f9c9g63c5d832d86da017@mail.gmail.com>

On Wed, May 6, 2009 at 5:24 AM, Piet van Oostrum <piet at cs.uu.nl> wrote:
>>>>>> Lacrima <Lacrima.Maxim at gmail.com> (L) wrote:
>
>>L> Hello!
>>L> For example I have two classes:
>
>>>>>> class First:
>>L> ? ? def __init__(self, *args, **kwargs):
>>L> ? ? ? ? ? ? pass
>
>>>>>> class Second:
>>L> ? ? def __init__(self, somearg, *args, **kwargs):
>>L> ? ? ? ? ? ? self.somearg = somearg
>
>>L> How can I test that First class takes 1 required argument and Second
>>L> class takes no required arguments?
>>L> So that I could instantiate them in a for loop.
>
>>>>>> a = [First, Second]
>>>>>> for cls in a:
>>L> ? ? instance = cls()
>
>>L> Traceback (most recent call last):
>>L> ? File "<pyshell#22>", line 2, in <module>
>>L> ? ? instance = cls()
>>L> TypeError: __init__() takes at least 2 arguments (1 given)
>
>>L> Of course, I can do like this:
>>>>>> for cls in a:
>>L> ? ? try:
>>L> ? ? ? ? ? ? instance = cls()
>>L> ? ? except TypeError:
>>L> ? ? ? ? ? ? instance = cls('hello')
>
>>>>>> print instance.somearg
>>L> hello
>
>>L> But what if I have to instantiate any class with 3 or 4 required
>>L> arguments? How can I do it?
>
> cls.__init__.im_func.__code__.co_argcount
>
> This will include self, so it will be 1 in First and 2 in Second.

AFAICT, that would count non-required arguments too, which isn't
strictly what the OP requested.

> However this is very dirty trickery and should not be recommended. It
> may also change in future versions and other implementations of Python.

Very much agreed.

> I think it would be cleaner to put a class attribute in the classes that
> defines how they should be initialized (e.g. just the number of required
> arguments or more specific information) or have a special factory method
> for this use case.

Seconded. I'd recommend the latter personally, though it's impossible
to give a definitive answer without more context.

Cheers,
Chris
-- 
http://blog.rebertia.com


From castironpi at gmail.com  Wed May  6 08:56:17 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Wed, 6 May 2009 05:56:17 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<6c6fffd7-2f43-454d-8e63-056d0c1c05d3@w31g2000prd.googlegroups.com> 
	<4a69c949-ace7-47d9-8bb7-d05bc6c895f3@s31g2000vbp.googlegroups.com> 
	<50222a39-88d0-49da-9105-2d3a47af5940@r34g2000vba.googlegroups.com> 
	<5b81cccc-c174-42bd-b4a0-638755ca9e03@l5g2000vbc.googlegroups.com> 
	<57b22b7c-1130-4f28-a7b7-bd119445de41@z19g2000vbz.googlegroups.com>
Message-ID: <507794a3-acc3-49f7-a418-4b1bf27c6a9e@s16g2000vbp.googlegroups.com>

On May 6, 2:23?am, Arnaud Delobelle <arno... at googlemail.com> wrote:
> On May 5, 10:20?pm, Aaron Brady <castiro... at gmail.com> wrote:
>
> > def auto( f ):
> > ? ? def _inner( *ar, **kw ):
> > ? ? ? ? return f( _inner, *ar, **kw )
> > ? ? return _inner
>
> Quoting myself near the start of this thread:
>
> Here's an idea:
>
> >>> def bindfunc(f):
>
> ... ? ? def boundf(*args, **kwargs):
> ... ? ? ? ? return f(boundf, *args, **kwargs)
> ... ? ? return boundf
>
> --
> Arnaud

Yeah, but that was two days ago.


From castironpi at gmail.com  Wed May  6 08:57:34 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Wed, 6 May 2009 05:57:34 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<50697b2c0905042346u482eabf9j1bb9f95853f38864@mail.gmail.com> 
	<mailman.5100.1241526783.11746.python-list@python.org>
	<%OeMl.9036$y61.4364@news-server.bigpond.net.au>
Message-ID: <c31f057b-6d97-4075-9a9d-47ed335d44df@r3g2000vbp.googlegroups.com>

On May 6, 6:49?am, Lie Ryan <lie.1... at gmail.com> wrote:
> Luis Zarrabeitia wrote:
> > Btw, is there any way to inject a name into a function's namespace? Following
> > the python tradition, maybe we should try to create a more general solution!
>
> How about a mechanism to pass arguments that are optional to accept?
>
> So (in the general case) the caller can call a function with certain
> arguments, but unless the function explicitly accept it, the argument
> will be discarded.
>
> With this, the injecting a local would simply be a case of adding an "I
> accept the argument" statement.
snip

You could write a decorator to do that with the inspect module, or you
could just accept a keyword dict for extra as-desired args.


From castironpi at gmail.com  Wed May  6 09:04:20 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Wed, 6 May 2009 06:04:20 -0700 (PDT)
Subject: object query assigned variable name?
References: <mailman.5142.1241589396.11746.python-list@python.org>
Message-ID: <e1a5d19f-9db1-4e72-882c-12cd37b0a33f@o14g2000vbo.googlegroups.com>

On May 6, 12:56?am, John O'Hagan <resea... at johnohagan.com> wrote:
> On Tue, 5 May 2009, Sion Arrowsmith wrote:
> > John O'Hagan ?<resea... at johnohagan.com> wrote:
> > >I can see that it's tantalizing, though, because _somebody_ must know
> > > about the assignment; after all, we just executed it!
>
> > Except we haven't, if we're talking about reporting from the
>
> > object's __init__:
> > >>> class Brian:
>
> > ... ? ? def __init__(self):
> > ... ? ? ? ? print "I'm Brian!"
> > ...
>
> > >>> l = []
> > >>> l[1] = Brian()
>
> > I'm Brian!
> > Traceback (most recent call last):
> > ? File "<stdin>", line 1, in <module>
> > IndexError: list assignment index out of range
>
> > (Yeah, I know that's a setitem call not an assignment. Point stands.
> > It also demonstrates why the whole idea of "what name is a newly-
> > created object assigned to" is broken.)
>
> I guess what I meant was that if I type:
>
> brian = Brian()
>
> in the python shell and then hit return, it seems to me that _somewhere_ (in
> the interpreter? I have no idea how it's done) it must be written that the
> new Brian object will later be assigned the name "brian", even as the process
> of creating the instance begins. As you've just demonstrated, the actual
> assignment occurs afterwards.
>
> But even if this is true I'm guessing it'd be black magic to get to it.
>
> Regards,
>
> John

In principle, you can't get all the names an object is bound to, since
it might be a temporary value or member of a container at some time.
If it was in a dictionary, would you want its key?  Or sequence and
index?

Furthermore, we don't have a data structure for two-way lookup.
Sometimes you would want to lookup name by object, sometimes object by
name.

Lastly, it would make code significantly less readable </subjective>.


From OldGrantonian at googlemail.com  Wed May  6 09:37:33 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Wed, 6 May 2009 06:37:33 -0700 (PDT)
Subject: Separate Windows versions of Python
Message-ID: <52b28a62-d0de-4d26-b2bd-dc4bf2affb71@p4g2000vba.googlegroups.com>

I use Windows Vista Home Premium. I have Python 2.6 currently
installed. I'm not a techy.

I want to use "virtualenv". When I try to install the latest version
of virtualenv for Windows, I get the message that Python 2.5 is not
found.

How do I install Python 2.5 (or anything else except 2.6) so that I
use the correct version of Python at the correct time.

For example, do I need to edit the "path" variable each time that I
want to change versions from 2.5 to 2.6?


From tornadomaker at gmx.net  Wed May  6 09:41:12 2009
From: tornadomaker at gmx.net (Mike)
Date: Wed, 6 May 2009 06:41:12 -0700 (PDT)
Subject: pyinstaller and logging
Message-ID: <f77c51e8-9b7e-44cc-b7bb-1d7c723b7764@o20g2000vbh.googlegroups.com>

Pyinstaller seems to have a problem with logging ...

 I installed pyinstaller 1.3 - using it together with Python 2.6. I
used pyinstaller for a small project, the created .exe worked fine.
After some additional changes to my project I got strange run time
errors when running the .exe (but no problems when running the .py
file directly with the python interpreter). I stripped down my program
and tracked the problem down to the first log message being written.

So this is a stripped down version of the python script:

import logging
logging.basicConfig(level=logging.INFO,
                    format='%(asctime)-15s %(levelname)-8s %(message)
s',
                    datefmt='%Y-%m-%d %H:%M:%S',
                    filename="test1.log",
                    filemode='w')
print "written via print"
logging.info("written via logging")

when I start this from the python shell I am getting
           IDLE 2.6.2      ==== No Subprocess ====
           >>>
           written via print
           >>>
and test1.log contains
           2009-05-05 19:39:52 INFO     written via logging
as expected.

When I start test1.exe I am getting

written via print
Traceback (most recent call last):
  File "<string>", line 8, in <module>
  File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
\v0r0m2\buildtest1\out1.pyz/logging", line 1451, in info
  File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
\v0r0m2\buildtest1\out1.pyz/logging", line 1030, in info
  File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
\v0r0m2\buildtest1\out1.pyz/logging", line 1142, in _log
  File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
\v0r0m2\buildtest1\out1.pyz/logging", line 1117, in makeRecord
  File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
\v0r0m2\buildtest1\out1.pyz/logging", line 272, in __init__
  File "C:\Programme\pyinstaller-1.3\iu.py", line 312, in importHook
    mod = _self_doimport(nm, ctx, fqname)
  File "C:\Programme\pyinstaller-1.3\iu.py", line 398, in doimport
    exec co in mod.__dict__
  File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
\v0r0m2\buildtest1\out1.pyz/multiprocessing", line 83, in <module>
  File "C:\Programme\pyinstaller-1.3\iu.py", line 312, in importHook
    mod = _self_doimport(nm, ctx, fqname)
  File "C:\Programme\pyinstaller-1.3\iu.py", line 382, in doimport
    mod = director.getmod(nm)
  File "C:\Programme\pyinstaller-1.3\iu.py", line 215, in getmod
    mod = owner.getmod(nm)
  File "C:\Programme\pyinstaller-1.3\iu.py", line 77, in getmod
    mod = imp.load_module(nm, fp, attempt, (ext, mode, typ))
TypeError: importHook() takes at most 5 arguments (6 given)

What am I doing wrong?


From james at agentultra.com  Wed May  6 09:48:51 2009
From: james at agentultra.com (J Kenneth King)
Date: Wed, 06 May 2009 09:48:51 -0400
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5109.1241543371.11746.python-list@python.org>
Message-ID: <85d4am8hq4.fsf@agentultra.com>

Emile van Sebille <emile at fenx.com> writes:

> On 5/5/2009 9:15 AM J Kenneth King said...
>
>> List comprehensions can make a reader of your code apprehensive
>> because it can read like a run-on sentence and thus be difficult to
>> parse. The Python documentation discourages their use and I believe
>> for good reason.
>
> Can you provide a link for this?  I'd like to see specifically what's
> being discouraged, as I'd be surprised to find routine usage frowned
> upon.
>
> Emile

http://docs.python.org/tutorial/datastructures.html#nested-list-comprehensions


"If you?ve got the stomach for it, list comprehensions can be
nested. They are a powerful tool but ? like all powerful tools ? they
need to be used carefully, if at all."

and

"In real world, you should prefer builtin functions to complex flow
statements."


From mauriceling at gmail.com  Wed May  6 10:08:24 2009
From: mauriceling at gmail.com (mauriceling@acm.org)
Date: Wed, 6 May 2009 07:08:24 -0700 (PDT)
Subject: [ANN] Completion of The Python Papers Volume 4 Issue 1
Message-ID: <8b10356e-1a40-424b-b288-bbc3fa6f7d39@x29g2000prf.googlegroups.com>

Welcome to Issue 4 Volume 1 of The Python Papers. This marks our 4th
year in business. It is my pleasure to announce 4 improvements made to
The Python Papers Anthology.

Firstly, we had created a class of editorial members in our team ? the
Editorial Reviewers (ER). This is in addition to the existing Editors-
in-Chief (EIC) and Associate Editors (AE). In the words of our revised
editorial policy, ?ER is a tier of editors deemed to have in-depth
expertise knowledge in specialized areas. As members of the editorial
board, ERs are accorded editorial status but are generally not
involved in the strategic and routine operations of the periodicals
although their
expert opinions may be sought at the discretion of EIC.? To this
aspect, we are glad to have Jacob Kaplan-Moss (President, Django
Software Foundation; Partner, Revolution Systems, LLC; Co-BDFL,
Django) as our first ER. Welcome aboard.

Secondly, we had adopted a fast publication scheme. In the past,
accepted manuscripts will only be published on the release date in the
month of April, August and December each year. With the use of Open
Journal System, we are able to publish manuscripts as they are being
accepted. This means that the release date in the month of April,
August and December is now effectively our closing date for the issue.
For example, manuscripts accepted after April 2009 will be routed to
immediate publication in Volume 4 Issue 2. This is to being
information faster to our readers, rather than waiting for a few
months.

Thirdly, we announce a set of manuscript templates for our authors and
contributors for their manuscript preparation. As such, we had
revamped our website (http://www.pythonpapers.org) to reflect these
changes.

Lastly, we are glad to announce the launch of our 2nd publication
under The Python Papers Anthology ? The Python Papers Source Codes
(ISSN 1836-621X). TPPSC, for short, is a collection of software and
source codes, usually associated with papers published in The Python
Papers and The Python Papers Monograph. These codes are refereed for
originality, accuracy, completeness, and lasting value. TPPSC will
act as a developers codebook of high-quality, peer-reviewed codes.
TPPSC is an annual publication using the same fast publication scheme.

We thank all our readers and contributors for their continued support.

Happy reading.

Maurice Ling
Co-EIC, TPPA


From exarkun at divmod.com  Wed May  6 10:10:40 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Wed, 6 May 2009 10:10:40 -0400
Subject: problem in using sendmail in multi thread
In-Reply-To: <f2453be6-12f3-4afd-be46-df6a3017fd0d@j18g2000prm.googlegroups.com>
Message-ID: <20090506141040.21531.104267133.divmod.quotient.836@henry.divmod.com>

On Tue, 5 May 2009 22:17:35 -0700 (PDT), gganesh <ganesh.gbg at gmail.com> wrote:
>On May 5, 9:25?pm, Piet van Oostrum <p... at cs.uu.nl> wrote:
>> >>>>> gganesh <ganesh.... at gmail.com> (g) wrote:
>> >g> hi,
>> >g> I'm a beginner in using Python script
>> >g> I'm trying to send mails using multi-thread
>> >g> I wrote
>> >g> FROM = 'ganeshx... at xxxx.com'
>> >g> # for more mail add';' the another mail id
>> >g> listTo = ['g.... at gmail.com', 'xxjango... at gmail.com',
>> >g> 'xx... at yahoo.co.in']
>> >g> SUBJECT = 'This is the subject'
>> >g> MSGBODY = 'This the body of the message '
>> >g> MAILSERVER = 'mail.xxxx.com'
>> >g> port = 25
>> >g> username = 'xxxxx'
>> >g> password = 'xxxxx'
>> >g> # trim the strings of any leading or trailing spaces
>> >g> FROM = FROM.strip()
>> >g> SUBJECT = SUBJECT.strip()
>> >g> MSGBODY = MSGBODY.strip()
>> >g> MAILSERVER = MAILSERVER.strip()
>> >g> username = username.strip()
>> >g> password = password.strip()
>> >g> #Connect to server
>> >g> print 'Connecting to mail server ', MAILSERVER
>> >g> try:
>> >g> ? ? ? s = smtplib.SMTP(MAILSERVER,port)
>>
>> You can't have a single SMTP connection that's used in multiple threads.
>> That is what causes the error. Each thread should have its own SMTP
>> connection. So move this code (above and below) into the run() method.
>>
>> >g> ? ? ? print 'connected'
>> >g> #s.set_debuglevel(1)
>> >g> except:
>> >g> ? ? ? ?print 'ERROR: Unable to connect to mail server', sys.exc_info ?()[0]
>> >g> ? ? ? ?sys.exit(1)
>> >g> #login to server
>> >g> if password <> '':
>> >g> ? ? ? print 'Logging into mail server'
>>
>> I think this try except block should be inside the if statement, i.e.
>> indented 4 spaces.
>>
>> >g> try:
>> >g> ? ? ? s.login(username,password)
>> >g> except:
>> >g> ? ? ? print 'ERROR: Unable to login to mail server', MAILSERVER
>> >g> ? ? ? print 'Please recheck your password'
>> >g> ? ? ? sys.exit(1)
>> >g> #--------------------------------------------------
>> >g> print "Starting Multi Thread Method"
>> >g> class MyThread(Thread):
>> >g> ? ? def __init__(self, site, s, FROM, MSGBODY):
>> >g> ? ? ? ? Thread.__init__(self)
>> >g> ? ? ? ? self.site = site
>> >g> ? ? ? self.s=s
>> >g> ? ? ? self.FROM=FROM
>> >g> ? ? ? self.MSGBODY=MSGBODY
>>
>> You give the s (connection) here as a parameter, store it in self.s and
>> never use that attribute.
>>
>> >g> ? ? def run(self):
>> >g> ? ? ? print "running for %s " %self.site
>> >g> ? ? ? s.sendmail(self.FROM, self.site, self.MSGBODY)
>>
>> Here you use the global s, not self.s
>>
>> As I said above you should do the SMTP connection setup, including the
>> login, here, and store the connection either in self.s or in a local
>> variable s in the method. As you don't use the s in another method, I
>> think a local variable is better.
>>
>> >g> ? ? ? print "Emailed for ?site %s" %self.site
>> >g> a= time.time()
>> >g> threads = []
>> >g> for site in listTo:
>> >g> ? ? T = MyThread(site,s,FROM,MSGBODY)
>> >g> ? ? threads.append(T)
>> >g> ? ? T.start()
>> >g> for i in threads:
>> >g> ? ? i.join()
>>
>> Of course the next 2 lines should also be moved to run().
>>
>> >g> s.quit()
>> >g> s.close()
>> >g> print "Took %s seconds" %str(time.time()-a)
>> >g> #-----------------------------------------------------
>>
>> --
>> Piet van Oostrum <p... at cs.uu.nl>
>> URL:http://pietvanoostrum.com[PGP 8DAE142BE17999C4]
>> Private email: p... at vanoostrum.org
>
>
>Thanks Everyone By your guidance the code worked fine
>I can send mails in multi threaded environment.
>Is this only way to send mails concurrently  or any other method
>aviable?

Here's another way:

    from twisted.mail.smtp import sendmail
    from twisted.internet import reactor
    from twisted.python.log import err

    MAILSERVER = ...
    listTo = [...]
    FROM = ...
    MSGBODY = ...

    done = sendmail(MAILSERVER, FROM, listTo, MSGBODY)
    done.addErrback(err)
    done.addCallback(lambda ignored: reactor.stop())
    reactor.run()

Jean-Paul


From piotrek at nonexistent.domain  Wed May  6 10:20:01 2009
From: piotrek at nonexistent.domain (Piotrek G.)
Date: Wed, 06 May 2009 16:20:01 +0200
Subject: Control a process interactively (pexpect) and save data
Message-ID: <gts6ad$8tn$1@news.task.gda.pl>

Hi,

I'm trying to use something like pexpect.interact() but I want to save 
all my inputs and save all outputs from the process (/bin/sh Linux).
The main goal is to record all sequence of commands and responses in 
order to automatically generate pexpect script.

My script is like below so far, but I'm unable to print responses to 
stdout and save it to variables/files/whatever.

p = pexpect.spawn('/bin/sh')
print "PID: " + str(p.pid)
p.logfile = sys.stdout
while True:
     if not p.isalive():
         print "Not alive"
         break
     else:
         print "Alive!"
     p.flush()
     bb = sys.stdin.readline()
     p.sendline(bb)
sys.exit(0)

pexpect.interact() doesn't allow to save input and output.

I tried pipes but I've found that "Don't use a pipe to control another 
application..." - http://edgysoftware.com/doc/python-pexpect/doc/

I tried subprocess module but it didn't allow me to control /bin/sh as 
communicate() method do as follows
"Interact with process: Send data to stdin. Read data from stdout and 
stderr, until end-of-file is reached. Wait for process to terminate. The 
optional input argument should be a string to be sent to the child 
process, or None, if no data should be sent to the child."

So it "waits for process to terminate" and I'm unable to interact...

Any suggestions?

Oh, and by the way my script works with /bin/sh but doesn't work with 
/bin/bash. If I enter 'exit' sh exits, bash does not... Why?

Thanks!
-- 
Regards
Piotrek


From aahz at pythoncraft.com  Wed May  6 10:39:50 2009
From: aahz at pythoncraft.com (Aahz)
Date: 6 May 2009 07:39:50 -0700
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
	<mailman.5031.1241420740.11746.python-list@python.org>
	<81f82d8c-80fa-4ba0-a402-3a8b5757a967@s16g2000vbp.googlegroups.com>
Message-ID: <gts7fm$qte$1@panix3.panix.com>

In article <81f82d8c-80fa-4ba0-a402-3a8b5757a967 at s16g2000vbp.googlegroups.com>,
Deep_Feelings  <doctoresam at gmail.com> wrote:
>
>anyone did that ? learning from python docs straight away ?

Yes.  Admittedly that was ten years ago and the docs have improved some
since then....
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From bborcic at gmail.com  Wed May  6 10:49:28 2009
From: bborcic at gmail.com (Boris Borcic)
Date: Wed, 06 May 2009 16:49:28 +0200
Subject: list comprehension question
In-Reply-To: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
Message-ID: <gts83i$32b$1@ger.gmane.org>

Ross wrote:
> If I have a list of tuples a = [(1,2), (3,4), (5,6)], and I want to
> return a new list of each individual element in these tuples, I can do
> it with a nested for loop but when I try to do it using the list
> comprehension b = [j for j in i for i in a], my output is b =
> [5,5,5,6,6,6] instead of the correct b = [1,2,3,4,5,6]. What am I
> doing wrong?
> --
> http://mail.python.org/mailman/listinfo/python-list
> 

just fyi, in python 2.6

list(itertools.chain.from_iterable(a))

would do it

in python 2.5

list(itertools.chain(*a))

would do it too, but I wouldn't try it with arbitrarily long a







From Scott.Daniels at Acm.Org  Wed May  6 10:57:00 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 06 May 2009 07:57:00 -0700
Subject: pyc files problem
In-Reply-To: <mailman.5146.1241600231.11746.python-list@python.org>
References: <c4ab18df0905052043s5a2d4cbena7888fa4fcea366@mail.gmail.com>	<op.uthr26pwx6zn5v@lepton.softlabbsas.com.ar>
	<mailman.5146.1241600231.11746.python-list@python.org>
Message-ID: <JZudnQEqyJKTOZzXnZ2dnUVZ_qSdnZ2d@pdx.net>

Dave Angel wrote:
> Gabriel Genellina wrote: ...
>> 06 May 2009 00:43:25 -0300, Mohamed Lrhazi <lrhazi at gmail.com> escribi?:
>>> My code sends a pointer to a Python function to a C library, using
>>> ctypes module. When my program restarts, after a crash or normal
>>> exit... it cannot start again without sigfaulting
>>
>> Do you mean that, if you delete the .pyc files your program runs 
>> properly, but if you keep the .pyc files your program crashes?
>> That's very strange...
>
> 1) Is it true (as Gabriel asks) that deleting the .pyc files solves the 
> problem?
> 2) If so, have you investigated to see which one of them gets 
> corrupted?  This isn't necessarily the problem, it could also be timing, 
> or related to the order of the memory allocation pool.
> 3) When you get the segment fault, what does you C debugger show?  
> What's happening at the time of the crash?
> 4) Is either the C code or the Python code multithreaded?
> 5) Are you running it under a Python debugger?
> 
Could this have to do with a manifest floating point constant
being a "Not A Number" or "Infinity"?  That is the last .pyc-
related problem I know about.

To the original poster:
Please give a _lot_ more detail about the full Python version,
OS type and version, and so on.  Otherwise, it becomes
tempting to say, "that is too bad, sorry you have troubles."
One way to isolate the problem (if it is, indeed .pyc-loading
related) is to delete individual .pyc files until you find the
suspect, then cut that one in pieces and re-isolate until you
have a small bit of code with the issue.  This is why we point
people to smart-questions(*) so often.

(*) http://www.catb.org/~esr/faqs/smart-questions.html

--Scott David Daniels
Scott.Daniels at Acm.Org


From michele.simionato at gmail.com  Wed May  6 11:14:16 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Wed, 6 May 2009 08:14:16 -0700 (PDT)
Subject: python docs for beginner programmer?
References: <deb7353b-19f7-48d7-9777-92b02eed7879@r3g2000vbp.googlegroups.com>
	<mailman.5031.1241420740.11746.python-list@python.org>
	<81f82d8c-80fa-4ba0-a402-3a8b5757a967@s16g2000vbp.googlegroups.com>
Message-ID: <404c22b7-041f-4c85-9c7d-11e9945d0758@v4g2000vba.googlegroups.com>

On May 5, 10:37?pm, Deep_Feelings <doctore... at gmail.com> wrote:
> that is good ,thank you
>
> anyone did that ? learning from python docs straight away ?

A lot of people did. I did, but I usually prefer reading user manuals
over books, and YMMV.


From keshet1 at umbc.edu  Wed May  6 11:31:58 2009
From: keshet1 at umbc.edu (Ben Keshet)
Date: Wed, 06 May 2009 11:31:58 -0400
Subject: Pyhton script to call another program
Message-ID: <4A01AD6E.4010807@umbc.edu>

Hi,

I am trying to write a simple python script to manipulate files and call 
other programs.  I have a program installed (rocs) which I run using 
cygwin on my XP (but is not in python).  Can I run the pyhton script and 
then call the other program in the same script?

For example:
Python Code  # this line opens a file
Python Code  # this line splits the file into 4 different files
rocs  # this line calls the program 'rocs' to run on the newly formed files
Python Code # this line renames rocs output files and saves them in the 
right place.

Otherwise, I would have to write two scripts (before and after 'rocs'), 
and run the 3 scripts/programs separately. 

I am relatively new to python and don't know a lot about cygwin.  Please 
remember that if you try to answer me :) Thanks!


From Scott.Daniels at Acm.Org  Wed May  6 11:35:51 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 06 May 2009 08:35:51 -0700
Subject: Separate Windows versions of Python
In-Reply-To: <52b28a62-d0de-4d26-b2bd-dc4bf2affb71@p4g2000vba.googlegroups.com>
References: <52b28a62-d0de-4d26-b2bd-dc4bf2affb71@p4g2000vba.googlegroups.com>
Message-ID: <1fWdnY3Iu8y0MJzXnZ2dnUVZ_uqdnZ2d@pdx.net>

OldGrantonian wrote:
> I use Windows Vista Home Premium. I have Python 2.6 currently
> installed. I'm not a techy.
> 
> I want to use "virtualenv". When I try to install the latest version
> of virtualenv for Windows, I get the message that Python 2.5 is not
> found.
> 
> How do I install Python 2.5 (or anything else except 2.6) so that I
> use the correct version of Python at the correct time.
> 
> For example, do I need to edit the "path" variable each time that I
> want to change versions from 2.5 to 2.6?

On windows, major versions (..., 2.5, 2.6, 2.7, ...., 3.0, 3.1,  ...)
can coexist quite successfully.  Find and run an installer for the
latest version  of 2.5 (2.5.4, I believe) on the Python download page.
That will make 2.5 your default Python.  To switch the easiest way
(for you) is uninstall the version of python you want to be the
default, then install it again (making it the last one installed).
This suggests keeping installer binaries for all version you are
using.  Note that the this uninstall-reinstall should not affect
you loaded Python packages that you have installed separately.
To simply run a python program with a different python (but not
change the default), open a command window (run program / cmd),
sometimes called a "terminal window" and use command:
     C:\> C:\Python24\python program.py  # command line version
or
     C:\> C:\Python24\pythonw program.pyw  # gui verson
You can also change shortcuts to refer to specific Python versions.

Of course, the different Python versions should also be available
on your start menu.

However, Starting with Python 2.6, if you want user-specific
installation, you can also create and put things in (for example),
     C:\Documents and Settings\USER\Application Data\
                             Python\Python26\site-packages
where you replace USER with the user name in question.

If you are not planning to do a lot of switching, that might be
enough for you.  The base directory is also called %APPDATA% on
a command line or via os.path.expandvars.  Once you have created
this site-packages directory, Python 2.6 and later will use it to
find .pth, .py, .pyw, and .pyd files (as well as .pyc and .pyo
files).  You may find changing your personal site-packages directory
(and/or a .pth therein that you manipulate) will address the issues
that you are planning to solve with virtualenv.

Sorry for the long-winded answer.
--Scott David Daniels
Scott.Daniels at Acm.Org


in addition to the common site-packages directory on


From deets at nospam.web.de  Wed May  6 11:57:46 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 06 May 2009 17:57:46 +0200
Subject: Pyhton script to call another program
References: <mailman.5152.1241624526.11746.python-list@python.org>
Message-ID: <76dq8pF1bisltU1@mid.uni-berlin.de>

Ben Keshet wrote:

> Hi,
> 
> I am trying to write a simple python script to manipulate files and call
> other programs.  I have a program installed (rocs) which I run using
> cygwin on my XP (but is not in python).  Can I run the pyhton script and
> then call the other program in the same script?
> 
> For example:
> Python Code  # this line opens a file
> Python Code  # this line splits the file into 4 different files
> rocs  # this line calls the program 'rocs' to run on the newly formed
> files Python Code # this line renames rocs output files and saves them in
> the right place.
> 
> Otherwise, I would have to write two scripts (before and after 'rocs'),
> and run the 3 scripts/programs separately.
> 
> I am relatively new to python and don't know a lot about cygwin.  Please
> remember that if you try to answer me :) Thanks!

Check out the module "subprocess" in the standard library documentation.
This will allow you to call other programs.

Diez


From Florian.Wollenschein at FernUni-Hagen.de  Wed May  6 12:06:17 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Wed, 06 May 2009 18:06:17 +0200
Subject: thc v0.3 - txt to html converter - better code?
In-Reply-To: <gtrin4$7h5$1@south.jnrs.ja.net>
References: <gtppqc$7v1$1@news-cedar.fernuni-hagen.de>
	<4a008996$0$31862$9b4e6d93@newsspool3.arcor-online.net>
	<gtrin4$7h5$1@south.jnrs.ja.net>
Message-ID: <gtschq$a1p$1@news-cedar.fernuni-hagen.de>

Richard Brodie wrote:
> "Stefan Behnel" <stefan_ml at behnel.de> wrote in message 
> news:4a008996$0$31862$9b4e6d93 at newsspool3.arcor-online.net...
> 
>>    language_map = {'English': 'EN', 'Deutsch': 'DE'}
>>    strict_or_transitional = {True: 'Transitional', False: 'Strict'}
>>
>>    # this will raise a KeyError for unknown languages
>>    language = language_map[ self.cmboBoxLang.currentText() ]
>>
>>    # this assumes that isChecked() returns True or False
>>    spec = strict_or_transitional[self.rdioBtnTransitional.isChecked()]
>>
>>    doctype = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 %s/%s">\n' % (
>>        spec, language)
> 
> Incidentally, the language in an HTML DOCTYPE refers to the language of the DTD, not
> the document. It's never correct to use //DE in an HTML page, unless you have a custom
> (German) DTD. So the code can be improved further by cutting that part out.
> 
>     strict_or_transitional = {True: 'Transitional', False: 'Strict'}
> 
>     # this assumes that isChecked() returns True or False
>     spec = strict_or_transitional[self.rdioBtnTransitional.isChecked()]
> 
>     doctype = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 %s//EN">\n' % spec
> 
> 


Yes, that's true. I missed that. Thanks for the information.
And many thanks to Stefan.


From mauriceling at gmail.com  Wed May  6 12:12:35 2009
From: mauriceling at gmail.com (Maurice Ling)
Date: Wed, 6 May 2009 09:12:35 -0700 (PDT)
Subject: Completion of The Python Papers Volume 4 Issue 1
References: <8b10356e-1a40-424b-b288-bbc3fa6f7d39@x29g2000prf.googlegroups.com>
Message-ID: <f77b7030-8fa7-454d-8926-e5f9b88b21cb@g31g2000pra.googlegroups.com>

My apologies.

It should be Volume 4 Issue 1 instead of Issue 4 Volume 1.

Thank you Scott for pointing this out.

Regards
Maurice

On May 6, 10:08 pm, "mauricel... at acm.org" <mauricel... at gmail.com>
wrote:
> Welcome to Issue 4 Volume 1 of The Python Papers. This marks our 4th
> year in business. It is my pleasure to announce 4 improvements made to
> The Python Papers Anthology.
>
> Firstly, we had created a class of editorial members in our team ? the
> Editorial Reviewers (ER). This is in addition to the existing Editors-
> in-Chief (EIC) and Associate Editors (AE). In the words of our revised
> editorial policy, ?ER is a tier of editors deemed to have in-depth
> expertise knowledge in specialized areas. As members of the editorial
> board, ERs are accorded editorial status but are generally not
> involved in the strategic and routine operations of the periodicals
> although their
> expert opinions may be sought at the discretion of EIC.? To this
> aspect, we are glad to have Jacob Kaplan-Moss (President, Django
> Software Foundation; Partner, Revolution Systems, LLC; Co-BDFL,
> Django) as our first ER. Welcome aboard.
>
> Secondly, we had adopted a fast publication scheme. In the past,
> accepted manuscripts will only be published on the release date in the
> month of April, August and December each year. With the use of Open
> Journal System, we are able to publish manuscripts as they are being
> accepted. This means that the release date in the month of April,
> August and December is now effectively our closing date for the issue.
> For example, manuscripts accepted after April 2009 will be routed to
> immediate publication in Volume 4 Issue 2. This is to being
> information faster to our readers, rather than waiting for a few
> months.
>
> Thirdly, we announce a set of manuscript templates for our authors and
> contributors for their manuscript preparation. As such, we had
> revamped our website (http://www.pythonpapers.org) to reflect these
> changes.
>
> Lastly, we are glad to announce the launch of our 2nd publication
> under The Python Papers Anthology ? The Python Papers Source Codes
> (ISSN 1836-621X). TPPSC, for short, is a collection of software and
> source codes, usually associated with papers published in The Python
> Papers and The Python Papers Monograph. These codes are refereed for
> originality, accuracy, completeness, and lasting value. TPPSC will
> act as a developers codebook of high-quality, peer-reviewed codes.
> TPPSC is an annual publication using the same fast publication scheme.
>
> We thank all our readers and contributors for their continued support.
>
> Happy reading.
>
> Maurice Ling
> Co-EIC, TPPA



From vinay_sajip at yahoo.co.uk  Wed May  6 12:14:41 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Wed, 6 May 2009 09:14:41 -0700 (PDT)
Subject: pyinstaller and logging
References: <f77c51e8-9b7e-44cc-b7bb-1d7c723b7764@o20g2000vbh.googlegroups.com>
Message-ID: <93736f55-0177-4be7-a333-8eb850d4c321@x6g2000vbg.googlegroups.com>

On May 6, 2:41 pm, Mike <tornadoma... at gmx.net> wrote:
> Pyinstaller seems to have a problem withlogging...
>
>  I installed pyinstaller 1.3 - using it together with Python 2.6. I
> used pyinstaller for a small project, the created .exe worked fine.
> After some additional changes to my project I got strange run time
> errors when running the .exe (but no problems when running the .py
> file directly with the python interpreter). I stripped down my program
> and tracked the problem down to the first log message being written.
>
> So this is a stripped down version of the python script:
>
> importlogginglogging.basicConfig(level=logging.INFO,
>                     format='%(asctime)-15s %(levelname)-8s %(message)
> s',
>                     datefmt='%Y-%m-%d %H:%M:%S',
>                     filename="test1.log",
>                     filemode='w')
> print "written via print"logging.info("written vialogging")
>
> when I start this from the python shell I am getting
>            IDLE 2.6.2      ==== No Subprocess ====
>            >>>
>            written via print
>            >>>
> and test1.log contains
>            2009-05-05 19:39:52 INFO     written vialogging
> as expected.
>
> When I start test1.exe I am getting
>
> written via print
> Traceback (most recent call last):
>   File "<string>", line 8, in <module>
>   File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> \v0r0m2\buildtest1\out1.pyz/logging", line 1451, in info
>   File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> \v0r0m2\buildtest1\out1.pyz/logging", line 1030, in info
>   File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> \v0r0m2\buildtest1\out1.pyz/logging", line 1142, in _log
>   File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> \v0r0m2\buildtest1\out1.pyz/logging", line 1117, in makeRecord
>   File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> \v0r0m2\buildtest1\out1.pyz/logging", line 272, in __init__
>   File "C:\Programme\pyinstaller-1.3\iu.py", line 312, in importHook
>     mod = _self_doimport(nm, ctx, fqname)
>   File "C:\Programme\pyinstaller-1.3\iu.py", line 398, in doimport
>     exec co in mod.__dict__
>   File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> \v0r0m2\buildtest1\out1.pyz/multiprocessing", line 83, in <module>
>   File "C:\Programme\pyinstaller-1.3\iu.py", line 312, in importHook
>     mod = _self_doimport(nm, ctx, fqname)
>   File "C:\Programme\pyinstaller-1.3\iu.py", line 382, in doimport
>     mod = director.getmod(nm)
>   File "C:\Programme\pyinstaller-1.3\iu.py", line 215, in getmod
>     mod = owner.getmod(nm)
>   File "C:\Programme\pyinstaller-1.3\iu.py", line 77, in getmod
>     mod = imp.load_module(nm, fp, attempt, (ext, mode, typ))
> TypeError: importHook() takes at most 5 arguments (6 given)
>
> What am I doing wrong?

Apparently, PyInstaller only supports versions of Python between 1.5
and 2.4:

http://www.pyinstaller.org/#Requirements

So, you are using it in an unsupported environment. I see you've cross-
posted this to the PyInstaller mailing list:

http://groups.google.com/group/PyInstaller

I hope someone on that list can help. An additional bit of information
from your traceback is that line 272 in 2.6's logging/__init__.py is
one that says "from multiprocessing import current_process". As this
line is only executed if logging.logMultiProcessing is set, you may be
able to work around by setting logging.logMultiProcessing to False in
your app initialisation. Of course, this might just result in a
failure somewhere else...

Regards,

Vinay Sajip




From OldGrantonian at googlemail.com  Wed May  6 12:24:56 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Wed, 6 May 2009 09:24:56 -0700 (PDT)
Subject: Separate Windows versions of Python
References: <52b28a62-d0de-4d26-b2bd-dc4bf2affb71@p4g2000vba.googlegroups.com>
	<1fWdnY3Iu8y0MJzXnZ2dnUVZ_uqdnZ2d@pdx.net>
Message-ID: <a7f1be3a-dcd0-4fe7-bad1-ff801b6ff142@e20g2000vbc.googlegroups.com>

Many thanks for the very detailed answer :)

I will go ahead right now and implement all your suggestions.




On May 6, 4:35?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> OldGrantonian wrote:
> > I use Windows Vista Home Premium. I have Python 2.6 currently
> > installed. I'm not a techy.
>
> > I want to use "virtualenv". When I try to install the latest version
> > of virtualenv for Windows, I get the message that Python 2.5 is not
> > found.
>
> > How do I install Python 2.5 (or anything else except 2.6) so that I
> > use the correct version of Python at the correct time.
>
> > For example, do I need to edit the "path" variable each time that I
> > want to change versions from 2.5 to 2.6?
>
> On windows, major versions (..., 2.5, 2.6, 2.7, ...., 3.0, 3.1, ?...)
> can coexist quite successfully. ?Find and run an installer for the
> latest version ?of 2.5 (2.5.4, I believe) on the Python download page.
> That will make 2.5 your default Python. ?To switch the easiest way
> (for you) is uninstall the version of python you want to be the
> default, then install it again (making it the last one installed).
> This suggests keeping installer binaries for all version you are
> using. ?Note that the this uninstall-reinstall should not affect
> you loaded Python packages that you have installed separately.
> To simply run a python program with a different python (but not
> change the default), open a command window (run program / cmd),
> sometimes called a "terminal window" and use command:
> ? ? ?C:\> C:\Python24\python program.py ?# command line version
> or
> ? ? ?C:\> C:\Python24\pythonw program.pyw ?# gui verson
> You can also change shortcuts to refer to specific Python versions.
>
> Of course, the different Python versions should also be available
> on your start menu.
>
> However, Starting with Python 2.6, if you want user-specific
> installation, you can also create and put things in (for example),
> ? ? ?C:\Documents and Settings\USER\Application Data\
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Python\Python26\site-packages
> where you replace USER with the user name in question.
>
> If you are not planning to do a lot of switching, that might be
> enough for you. ?The base directory is also called %APPDATA% on
> a command line or via os.path.expandvars. ?Once you have created
> this site-packages directory, Python 2.6 and later will use it to
> find .pth, .py, .pyw, and .pyd files (as well as .pyc and .pyo
> files). ?You may find changing your personal site-packages directory
> (and/or a .pth therein that you manipulate) will address the issues
> that you are planning to solve with virtualenv.
>
> Sorry for the long-winded answer.
> --Scott David Daniels
> Scott.Dani... at Acm.Org
>
> in addition to the common site-packages directory on



From damienlmoore at gmail.com  Wed May  6 12:51:57 2009
From: damienlmoore at gmail.com (spillz)
Date: Wed, 6 May 2009 09:51:57 -0700 (PDT)
Subject: Problem with case insensitive volumes
References: <bcc6b573-d9d2-4621-944b-dad05e07bb70@l5g2000vbc.googlegroups.com>
	<mailman.5088.1241498014.11746.python-list@python.org>
	<26c57bf5-5ad2-4838-8097-c8d51cf1ccae@n8g2000vbb.googlegroups.com>
	<b4adnUex6-RR2J3XnZ2dnUVZ_t2dnZ2d@pdx.net>
	<b5d10d01-0f56-4df9-9e4e-99a93a0e0a0f@s31g2000vbp.googlegroups.com>
	<mailman.5131.1241576707.11746.python-list@python.org>
Message-ID: <7761aa9c-2d0f-4429-9b02-766b315c0c80@o30g2000vbc.googlegroups.com>

On May 5, 10:24?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> I use this function on Windows to obtain the true case name of a file:

very nice. I think the python bindings to the gnome GIO library
*might* provide what I need on the linux side.


From tornadomaker at gmx.net  Wed May  6 13:22:32 2009
From: tornadomaker at gmx.net (Mike)
Date: Wed, 6 May 2009 10:22:32 -0700 (PDT)
Subject: pyinstaller and logging
References: <f77c51e8-9b7e-44cc-b7bb-1d7c723b7764@o20g2000vbh.googlegroups.com>
	<93736f55-0177-4be7-a333-8eb850d4c321@x6g2000vbg.googlegroups.com>
Message-ID: <b6c04e60-3692-4ee3-a438-8b5563caccc9@r34g2000vbi.googlegroups.com>

On 6 Mai, 18:14, Vinay Sajip <vinay_sa... at yahoo.co.uk> wrote:
> On May 6, 2:41 pm, Mike <tornadoma... at gmx.net> wrote:
>
>
>
> > Pyinstaller seems to have a problem withlogging...
>
> > ?I installed pyinstaller 1.3 - using it together with Python 2.6. I
> > used pyinstaller for a small project, the created .exe worked fine.
> > After some additional changes to my project I got strange run time
> > errors when running the .exe (but no problems when running the .py
> > file directly with the python interpreter). I stripped down my program
> > and tracked the problem down to the first log message being written.
>
> > So this is a stripped down version of the python script:
>
> > importlogginglogging.basicConfig(level=logging.INFO,
> > ? ? ? ? ? ? ? ? ? ? format='%(asctime)-15s %(levelname)-8s %(message)
> > s',
> > ? ? ? ? ? ? ? ? ? ? datefmt='%Y-%m-%d %H:%M:%S',
> > ? ? ? ? ? ? ? ? ? ? filename="test1.log",
> > ? ? ? ? ? ? ? ? ? ? filemode='w')
> > print "written via print"logging.info("written vialogging")
>
> > when I start this from the python shell I am getting
> > ? ? ? ? ? ?IDLE 2.6.2 ? ? ?==== No Subprocess ====
>
> > ? ? ? ? ? ?written via print
>
> > and test1.log contains
> > ? ? ? ? ? ?2009-05-05 19:39:52 INFO ? ? written vialogging
> > as expected.
>
> > When I start test1.exe I am getting
>
> > written via print
> > Traceback (most recent call last):
> > ? File "<string>", line 8, in <module>
> > ? File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> > \v0r0m2\buildtest1\out1.pyz/logging", line 1451, in info
> > ? File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> > \v0r0m2\buildtest1\out1.pyz/logging", line 1030, in info
> > ? File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> > \v0r0m2\buildtest1\out1.pyz/logging", line 1142, in _log
> > ? File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> > \v0r0m2\buildtest1\out1.pyz/logging", line 1117, in makeRecord
> > ? File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> > \v0r0m2\buildtest1\out1.pyz/logging", line 272, in __init__
> > ? File "C:\Programme\pyinstaller-1.3\iu.py", line 312, in importHook
> > ? ? mod = _self_doimport(nm, ctx, fqname)
> > ? File "C:\Programme\pyinstaller-1.3\iu.py", line 398, in doimport
> > ? ? exec co in mod.__dict__
> > ? File "c:\dokumente und einstellungen\dieter\eigene dateien\collector
> > \v0r0m2\buildtest1\out1.pyz/multiprocessing", line 83, in <module>
> > ? File "C:\Programme\pyinstaller-1.3\iu.py", line 312, in importHook
> > ? ? mod = _self_doimport(nm, ctx, fqname)
> > ? File "C:\Programme\pyinstaller-1.3\iu.py", line 382, in doimport
> > ? ? mod = director.getmod(nm)
> > ? File "C:\Programme\pyinstaller-1.3\iu.py", line 215, in getmod
> > ? ? mod = owner.getmod(nm)
> > ? File "C:\Programme\pyinstaller-1.3\iu.py", line 77, in getmod
> > ? ? mod = imp.load_module(nm, fp, attempt, (ext, mode, typ))
> > TypeError: importHook() takes at most 5 arguments (6 given)
>
> > What am I doing wrong?
>
> Apparently, PyInstaller only supports versions of Python between 1.5
> and 2.4:
>
> http://www.pyinstaller.org/#Requirements
>
> So, you are using it in an unsupported environment. I see you've cross-
> posted this to the PyInstaller mailing list:
>
> http://groups.google.com/group/PyInstaller
>
> I hope someone on that list can help. An additional bit of information
> from your traceback is that line 272 in 2.6's logging/__init__.py is
> one that says "from multiprocessing import current_process". As this
> line is only executed if logging.logMultiProcessing is set, you may be
> able to work around by setting logging.logMultiProcessing to False in
> your app initialisation. Of course, this might just result in a
> failure somewhere else...
>
> Regards,
>
> Vinay Sajip

Shame on me - I somehow skipped the requirement from pyinstaller just
supporting python between 1.5 and 2.4 ... - thanks for your help - I
was aware it is not supporting python 3.0 (I searched a tool
creating .exes for Python 3.0 in the first place). I googled around
and found some recommendations for pyinstaller, but with the
restriction "it is just supporting the latest version of 2.x but not
3.0 of python". I never double checked on the formal requirements on
the pyinstaller site... .

Your hint regarding logging.logMultiProcessing=False did not change
the problem. As I do not want to switch to python 2.4 I will have to
look for something else. I tried py2exe today, which seems to work
fine for my project (and officially supports python 2.6 ;-) ) - it is
able to create an exe file within a dist directory, but not a single
executable like pyinstaller is doing it. But this is fine enough for
me just now.


From norseman at hughes.net  Wed May  6 13:47:21 2009
From: norseman at hughes.net (norseman)
Date: Wed, 06 May 2009 10:47:21 -0700
Subject: Pyhton script to call another program
In-Reply-To: <4A01AD6E.4010807@umbc.edu>
References: <4A01AD6E.4010807@umbc.edu>
Message-ID: <4A01CD29.3010507@hughes.net>

Ben Keshet wrote:
> Hi,
> 
> I am trying to write a simple python script to manipulate files and call 
> other programs.  I have a program installed (rocs) which I run using 
> cygwin on my XP (but is not in python).  Can I run the pyhton script and 
> then call the other program in the same script?
> 
> For example:
> Python Code  # this line opens a file
> Python Code  # this line splits the file into 4 different files
> rocs  # this line calls the program 'rocs' to run on the newly formed files
> Python Code # this line renames rocs output files and saves them in the 
> right place.
> 
> Otherwise, I would have to write two scripts (before and after 'rocs'), 
> and run the 3 scripts/programs separately.
> I am relatively new to python and don't know a lot about cygwin.  Please 
> remember that if you try to answer me :) Thanks!
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 
==========================================
If you don't like a lot of typing that obscures the process,
take a look at the spawn family.


  processPython 2.5.2 (r252:60911, Mar  4 2008, 10:40:55)
[GCC 3.3.6] on linux2
Type "help", "copyright", "credits" or "license" for more information.

 >>> import os
 >>> AbWd = os.spawnlp( os.P_WAIT,"abiword","abiword","")

The P_WAIT stops python until the program (abiword in this case) 
completes.  The "" at the end are for tokens to be given to the program 
and yes - contrary to manual, the program MUST be there TWICE (complete 
with any path needed).

for windows this works:
(can't cut and paste from a dos box!###%*&!!!)

Python 2.5.1 ... on win32
 >>> import os
 >>> result = os.spawnl( os.P_WAIT, "d:\\winmcad\\mcad","")

Runs the program mcad. Returns to python when mcad exits.


Today: 20090506
Python ver as snippets show.
OS is Linux Slackware 10.2
OS is Windows XP Pro

Steve


From Florian.Wollenschein at FernUni-Hagen.de  Wed May  6 13:48:11 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Wed, 06 May 2009 19:48:11 +0200
Subject: hex(dummy)[2:] - issue...
Message-ID: <gtsigt$31m$1@news-cedar.fernuni-hagen.de>

Hi there,

I need some advice :-)
I'm using hex(dummy)[2:] to represent a color in hexadecimal format for 
the bgcolor in an html file. dummy is the color value in RGB of course...

Now, if there's an R, G or B value of zero, this command only prints one 
single 0 instead of two. What's wrong with the code?

Thanks,
Listick
http://www.listick.org


From 71david at libero.it  Wed May  6 13:49:57 2009
From: 71david at libero.it (David)
Date: Wed, 6 May 2009 19:49:57 +0200
Subject: Pyhton script to call another program
References: <mailman.5152.1241624526.11746.python-list@python.org>
Message-ID: <1crn8u0lutm6h$.1qt709r9zm842.dlg@40tude.net>

Il Wed, 06 May 2009 11:31:58 -0400, Ben Keshet ha scritto:

> Hi,
> 
> I am trying to write a simple python script to manipulate files and call 
> other programs.  I have a program installed (rocs) which I run using 
> cygwin on my XP (but is not in python).  Can I run the pyhton script and 
> then call the other program in the same script?

Look at the os.system function call.

D.


From python.list at tim.thechases.com  Wed May  6 13:54:13 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 06 May 2009 12:54:13 -0500
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another
	program)
In-Reply-To: <4A01CD29.3010507@hughes.net>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
Message-ID: <4A01CEC5.4090008@tim.thechases.com>

> for windows this works:
> (can't cut and paste from a dos box!###%*&!!!)

Depending on how it was spawned, you can either right-click in 
the window and choose Mark/Paste (when marking, use <enter> to 
terminate the selection; and selections are blockwise rectangular 
rather than linewise or characterwise).  Alternatively, if you 
click on the system menu (the icon in the title-bar with 
resize/minimize/maximize/close/help), there should be an Edit 
submenu with the same options within.

A pain, but at least feasible.

HTH,

-tkc






From norseman at hughes.net  Wed May  6 14:02:06 2009
From: norseman at hughes.net (norseman)
Date: Wed, 06 May 2009 11:02:06 -0700
Subject: Which one is best Python or Java for developing GUI applications?
In-Reply-To: <aee48b3c0905060146t3ada829eucfc0d79cc8be9c67@mail.gmail.com>
References: <793408.86105.qm@web7903.mail.in.yahoo.com>	<gtreu8$f64$1@ger.gmane.org>
	<aee48b3c0905060146t3ada829eucfc0d79cc8be9c67@mail.gmail.com>
Message-ID: <4A01D09E.3020304@hughes.net>

Tim Rowe wrote:
> 2009/5/6 Dennis Lee Bieber <wlfraed at ix.netcom.com>:
> 
>> (the "near" is because I feel Ada is
>> stricter than any other language)
> 
> Try SPARK -- it's Ada based, but /much/ stricter. It's just right for
> some really critical stuff, but is no sort of an answer to "Which one
> is best Python or Java for developing GUI"!
> 
==========================

"...really critical stuff..."    Then the only real choice is assembly!

And correct - that's nothing to do with Python vs Java.

Back to the question:
Python has one advantage that has not been mentioned.  It allows the 
programmer to start with prior coding practices and 'ease' into OOP 
because Python happily allows a mix of traditional and OOP coding.

Beyond that - "There is no accounting for taste."  You are on your own.
You see - with daughter #1 I need pencil and paper to explain things.
           with daughter #2 I sit on my hands and narrate correctly the
             first time.
Many things have no "one is better" option beyond individual quirks. Or 
shall we say preferences?  The old - "This works for me" is right one.

Steve


From wzab01 at gmail.com  Wed May  6 14:03:57 2009
From: wzab01 at gmail.com (wzab)
Date: Wed, 6 May 2009 11:03:57 -0700 (PDT)
Subject: IIR filter conversion routines for Python?
Message-ID: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>

Hi,
I'm looking for procedures converting the IIR filters into cascade and/
or parallel forms. Something like dir2cas.m or dir2par.m known in the
Matlab/Octave world.
Unfortunately SciPy does not contain such functions.
If they are not available, I would be grateful for any hints helping
me to implement them myself.
--
TIA, BR,
WZab


From Shawn at Milochik.com  Wed May  6 14:12:53 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 6 May 2009 14:12:53 -0400
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another 
	program)
In-Reply-To: <4A01CEC5.4090008@tim.thechases.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<4A01CEC5.4090008@tim.thechases.com>
Message-ID: <2dc0c81b0905061112l32426cb8rafa3a86dca12810d@mail.gmail.com>

On Wed, May 6, 2009 at 1:54 PM, Tim Chase <python.list at tim.thechases.com> wrote:
>> for windows this works:
>> (can't cut and paste from a dos box!###%*&!!!)
>
> Depending on how it was spawned, you can either right-click in the window
> and choose Mark/Paste (when marking, use <enter> to terminate the selection;
> and selections are blockwise rectangular rather than linewise or
> characterwise). ?Alternatively, if you click on the system menu (the icon in
> the title-bar with resize/minimize/maximize/close/help), there should be an
> Edit submenu with the same options within.
>
> A pain, but at least feasible.
<snip>

I know I'm coming to the conversation late, but here's what I do*:

1. Use Cygwin. (http://www.cygwin.com/)
2. Use PuttyCYG (http://code.google.com/p/puttycyg/)

That way, you can basically use PuTTY to shell into your Windows box.

Note: If you are familiar with the Linux command line, you will be in
love with this solution. If you're a Windows-only type, then be
forewarned that doing this will require you to type Unix/Linux
commands (for the most part) instead of DOS commands.

*Disclaimer: I use a Mac and Linux. This is my workaround when forced
to use Windows. Your environment preferences may vary.


From python.list at tim.thechases.com  Wed May  6 14:13:23 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 06 May 2009 13:13:23 -0500
Subject: hex(dummy)[2:] - issue...
In-Reply-To: <gtsigt$31m$1@news-cedar.fernuni-hagen.de>
References: <gtsigt$31m$1@news-cedar.fernuni-hagen.de>
Message-ID: <4A01D343.8000800@tim.thechases.com>

> I need some advice :-)
> I'm using hex(dummy)[2:] to represent a color in hexadecimal format for 
> the bgcolor in an html file. dummy is the color value in RGB of course...
> 
> Now, if there's an R, G or B value of zero, this command only prints one 
> single 0 instead of two. What's wrong with the code?

You can try

  PLACES = 2 # 6?
  hex(dummy)[2:].zfill(PLACES)

Alternatively, you can output decimal numbers in HTML/CSS with

   rgb(r, g, b)

such as

   style="rgb(255,0,0)"

However, I recommend doing this via CSS unless you have a strong 
reason to sully your HTML with style information.

-tkc









From stermen975 at gmail.com  Wed May  6 14:27:18 2009
From: stermen975 at gmail.com (stermen)
Date: Wed, 06 May 2009 18:27:18 GMT
Subject: Iphone Going 3G!
In-Reply-To: <49081152_1@news.tm.net.my>
References: <486cab43$1_2@news.tm.net.my> <20fqou.nq0.19.1@news.alt.net>
	<48df149c_1@news.tm.net.my> <49081152_1@news.tm.net.my>
Message-ID: <aEkMl.315069$FR.617400@twister1.libero.it>

Notebooks stocks priced

http://rover.ebay.com/rover/1/711-53200-19255-0/1?type=3&campid=5336229480&toolid=10001&customid=&ext=notebook&satitle=notebook











"Shafiq" <JGK_7733 at yahoo.com> ha scritto nel messaggio 
news:49081152_1 at news.tm.net.my...
> apalah kau ni tak belajar ke bahasa menunjukkan bangsa
> "news.tm.net.my" <kutukutu at maha.com> wrote in message 
> news:48df149c_1 at news.tm.net.my...
>> relic wrote:
>>> fizzi wrote:
>>>> For the Iphone lovers out there,
>>>
>>> Wrong group. No weirdos here.
>> testtt
>
> 



From google at mrabarnett.plus.com  Wed May  6 14:28:02 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 06 May 2009 19:28:02 +0100
Subject: hex(dummy)[2:] - issue...
In-Reply-To: <gtsigt$31m$1@news-cedar.fernuni-hagen.de>
References: <gtsigt$31m$1@news-cedar.fernuni-hagen.de>
Message-ID: <4A01D6B2.8060805@mrabarnett.plus.com>

Florian Wollenschein wrote:
> Hi there,
> 
> I need some advice :-)
> I'm using hex(dummy)[2:] to represent a color in hexadecimal format for 
> the bgcolor in an html file. dummy is the color value in RGB of course...
> 
> Now, if there's an R, G or B value of zero, this command only prints one 
> single 0 instead of two. What's wrong with the code?
> 
hex() returns '0x' followed by no more digits than are necessary:

 >>> hex(0xFF)
'0xff'
 >>> hex(0xF)
'0xf'

Try "%02X" instead (it'll pad with leading zeros up to a width of 2):

 >>> "%02X" % 0xFF
'FF'
 >>> "%02X" % 0xF
'0F'



From iainemsley at googlemail.com  Wed May  6 14:32:28 2009
From: iainemsley at googlemail.com (iainemsley)
Date: Wed, 6 May 2009 11:32:28 -0700 (PDT)
Subject: Parsing text
Message-ID: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>

Hi,
I'm trying to write a fairly basic text parser to split up scenes and
acts in plays to put them into XML. I've managed to get the text split
into the blocks of scenes and acts and returned correctly but I'm
trying to refine this and get the relevant scene number when the split
is made but I keep getting an NoneType error trying to read the block
inside the for loop and nothing is being returned. I'd be grateful for
some suggestions as to how to get this working.

for scene in text.split('Scene'):
    num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)
    textNum = num.match(scene)
    if textNum:
        print textNum
    else:
        print "No scene number"
    m = '<div type="scene>'
    m += scene
    m += '<\div>'
    print m

Thanks, Iain


From invalid at invalid  Wed May  6 14:39:47 2009
From: invalid at invalid (Grant Edwards)
Date: Wed, 06 May 2009 13:39:47 -0500
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another
	program)
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<4A01CEC5.4090008@tim.thechases.com>
	<mailman.5155.1241633576.11746.python-list@python.org>
Message-ID: <-ZOdnagfEPjuRJzXnZ2dnUVZ_omdnZ2d@posted.visi>

On 2009-05-06, Shawn Milochik <Shawn at Milochik.com> wrote:

> I know I'm coming to the conversation late, but here's what I do*:
>
> 1. Use Cygwin. (http://www.cygwin.com/)
> 2. Use PuttyCYG (http://code.google.com/p/puttycyg/)
>
> That way, you can basically use PuTTY to shell into your
> Windows box.

Better yet, set up sshd in your Cygwin install, and then use
whatever terminal you normally use on your Linux/MacOS box to
ssh into the Cygwin box.  When run that way, windows is almost
usable...

-- 
Grant Edwards                   grante             Yow! Oh, I get it!!
                                  at               "The BEACH goes on", huh,
                               visi.com            SONNY??


From Shawn at Milochik.com  Wed May  6 14:47:24 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 6 May 2009 14:47:24 -0400
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another 
	program)
In-Reply-To: <-ZOdnagfEPjuRJzXnZ2dnUVZ_omdnZ2d@posted.visi>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<4A01CEC5.4090008@tim.thechases.com>
	<mailman.5155.1241633576.11746.python-list@python.org>
	<-ZOdnagfEPjuRJzXnZ2dnUVZ_omdnZ2d@posted.visi>
Message-ID: <2dc0c81b0905061147v55027b08t3a5fafb0ebea81f9@mail.gmail.com>

On Wed, May 6, 2009 at 2:39 PM, Grant Edwards <invalid at invalid> wrote:
> On 2009-05-06, Shawn Milochik <Shawn at Milochik.com> wrote:
>
>> I know I'm coming to the conversation late, but here's what I do*:
>>
>> 1. Use Cygwin. (http://www.cygwin.com/)
>> 2. Use PuttyCYG (http://code.google.com/p/puttycyg/)
>>
>> That way, you can basically use PuTTY to shell into your
>> Windows box.
>
> Better yet, set up sshd in your Cygwin install, and then use
> whatever terminal you normally use on your Linux/MacOS box to
> ssh into the Cygwin box. ?When run that way, windows is almost
> usable...
>
> --
> Grant Edwards

<snip>

True, but when I'm using Cygwin, that means I'm at work and don't have
a non-MS OS available. Of course I can open an ssh session to my home
machine for sanity (or kicking off a torrent download at home), but I
don't have a *nix-based OS at the day job. Lanching DSL embedded to
use the terminal seems a bit much. ^_^

Shawn


From Shawn at Milochik.com  Wed May  6 14:49:49 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 6 May 2009 14:49:49 -0400
Subject: Parsing text
In-Reply-To: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <2dc0c81b0905061149p4e2f4f07y7ad6168c491f6244@mail.gmail.com>

On Wed, May 6, 2009 at 2:32 PM, iainemsley <iainemsley at googlemail.com> wrote:
> Hi,
> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.
>
> for scene in text.split('Scene'):
> ? ?num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)
> ? ?textNum = num.match(scene)
> ? ?if textNum:
> ? ? ? ?print textNum
> ? ?else:
> ? ? ? ?print "No scene number"
> ? ?m = '<div type="scene>'
> ? ?m += scene
> ? ?m += '<\div>'
> ? ?print m
>
> Thanks, Iain


Can you provide some sample input so we can recreate the problem?

Also, consider something like this instead of the concatenation:

m = '<div type="scene>%s</div>' % (scene,)


From Scott.Daniels at Acm.Org  Wed May  6 14:50:39 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 06 May 2009 11:50:39 -0700
Subject: Parsing text
In-Reply-To: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <UumdnU_wfaNMR5zXnZ2dnUVZ_v2dnZ2d@pdx.net>

iainemsley wrote:
> Hi,
> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.
> 
> ...(some code)...

You'll get a lot better help if you:
     (1) Include enough code to run and encounter the problem.
         Edit this down to something small (in the process,
         you may discover what was wrong).
     (2) Include actual sample data demonstrating the problem.
and (3) Cut and paste the _actual_ error message and traceback
         from your output when running the sample code with the
         sample data.
For extra points, identify the Python version you are using.

--Scott David Daniels
Scott.Daniels at Acm.Org


From google at mrabarnett.plus.com  Wed May  6 14:55:21 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 06 May 2009 19:55:21 +0100
Subject: Parsing text
In-Reply-To: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <4A01DD19.3020106@mrabarnett.plus.com>

iainemsley wrote:
> Hi,
> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.
> 
> for scene in text.split('Scene'):
>     num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)
>     textNum = num.match(scene)
>     if textNum:
>         print textNum
>     else:
>         print "No scene number"
>     m = '<div type="scene>'
>     m += scene
>     m += '<\div>'
>     print m
> 
The problem is with your regular expression. Unfortunately, I can't tell
what you're trying to match. Could you provide some examples of the
scene numbers?


From invalid at invalid  Wed May  6 14:56:38 2009
From: invalid at invalid (Grant Edwards)
Date: Wed, 06 May 2009 13:56:38 -0500
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another
	program)
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<4A01CEC5.4090008@tim.thechases.com>
	<mailman.5155.1241633576.11746.python-list@python.org>
	<-ZOdnagfEPjuRJzXnZ2dnUVZ_omdnZ2d@posted.visi>
	<mailman.5157.1241635647.11746.python-list@python.org>
Message-ID: <Jp6dnUCXzYr7QJzXnZ2dnUVZ_qGdnZ2d@posted.visi>

On 2009-05-06, Shawn Milochik <Shawn at Milochik.com> wrote:

>>> That way, you can basically use PuTTY to shell into your
>>> Windows box.
>>
>> Better yet, set up sshd in your Cygwin install, and then use
>> whatever terminal you normally use on your Linux/MacOS box to
>> ssh into the Cygwin box. ??When run that way, windows is almost
>> usable...
>
><snip>
>
> True, but when I'm using Cygwin, that means I'm at work and don't have
> a non-MS OS available.

Ouch.  That's too bad.  I spent a few months doing a project
for which the compiler was windows-only.  I found that doing
all of the editing, source-control, and testing on Linux and
sshing into a Cygwin box to do the "make" was minimally
painful.

> Of course I can open an ssh session to my home machine for
> sanity (or kicking off a torrent download at home), but I
> don't have a *nix-based OS at the day job. Lanching DSL
> embedded to use the terminal seems a bit much. ^_^

Probably so.

-- 
Grant Edwards                   grante             Yow! I want a VEGETARIAN
                                  at               BURRITO to go ... with
                               visi.com            EXTRA MSG!!


From python.list at tim.thechases.com  Wed May  6 14:59:19 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 06 May 2009 13:59:19 -0500
Subject: Parsing text
In-Reply-To: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <4A01DE07.1060309@tim.thechases.com>

> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.
> 
> for scene in text.split('Scene'):
>     num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)

The first thing that occurs to me is that this should likely be a 
raw string to get those backslashes into the regexp.  Compare:

   print "^\s\[0-9, i{1,4}, v]"
   print r"^\s\[0-9, i{1,4}, v]"

Without an excerpt of the actual text (or at least the lead-in 
for each scene), it's hard to tell whether this regex finds what 
you expect.  It doesn't look like your regexp finds what you may 
think it does (it looks like you're using commas .

Just so you're aware, your split is a bit fragile too, in case 
any lines contain "Scene".  However, with a proper regexp, you 
can even use it to split the scenes *and* tag the scene-number. 
Something like

   >>> import re
   >>> s = """Scene [42]
   ... this is stuff in the 42nd scene
   ... Scene [IIV]
   ... stuff in the other scene
   ... """
   >>> r = re.compile(r"Scene\s+\[(\d+|[ivx]+)]", re.I)
   >>> r.split(s)[1:]
   ['42', '\nthis is stuff in the 42nd scene\n', 'IIV', '\nstuff 
in the other scene\n']
   >>> def grouper(iterable, groupby):
   ...     iterable = iter(iterable)
   ...     while True:
   ...             yield [iterable.next() for _ in range(groupby)]
   ...

   >>> for scene, content in grouper(r.split(s)[1:], 2):
   ...     print "<div class='scene'><h1>%s</h1><p>%s</p></div>" 
% (scene, content)
   ...
   <div class='scene'><h1>42</h1><p>
   this is stuff in the 42nd scene
   </p></div>
   <div class='scene'><h1>IIV</h1><p>
   stuff in the other scene
   </p></div>

Play accordingly.

-tkc






From stefan_ml at behnel.de  Wed May  6 15:05:04 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 06 May 2009 21:05:04 +0200
Subject: Parsing text
In-Reply-To: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <4a01df61$0$30226$9b4e6d93@newsspool1.arcor-online.net>

iainemsley wrote:
> for scene in text.split('Scene'):
>     num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)
>     textNum = num.match(scene)

Not related to your problem, but to your code - I'd write this as follows:

	match_scene_num = re.compile("^\s\[0-9, i{1,4}, v]", re.I).match

	for scene_section in text.split('Scene'):
	    text_num = match_scene_num(scene_section)

This makes the code more readable and avoids unnecessary work inside the loop.

Stefan


From tjreedy at udel.edu  Wed May  6 15:28:04 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 06 May 2009 15:28:04 -0400
Subject: Separate Windows versions of Python
In-Reply-To: <1fWdnY3Iu8y0MJzXnZ2dnUVZ_uqdnZ2d@pdx.net>
References: <52b28a62-d0de-4d26-b2bd-dc4bf2affb71@p4g2000vba.googlegroups.com>
	<1fWdnY3Iu8y0MJzXnZ2dnUVZ_uqdnZ2d@pdx.net>
Message-ID: <gtsoc3$sgv$2@ger.gmane.org>

Scott David Daniels wrote:

> On windows, major versions (..., 2.5, 2.6, 2.7, ...., 3.0, 3.1,  ...)
> can coexist quite successfully.  Find and run an installer for the
> latest version  of 2.5 (2.5.4, I believe) on the Python download page.
> That will make 2.5 your default Python. 

  believe the installer gives one the choice as to whether or not to 
make the new installation the default -- which is to say, the one 
registered with .py, etc, extensions.



From philip at subaru.naoj.org  Wed May  6 16:03:09 2009
From: philip at subaru.naoj.org (Philip)
Date: Wed, 6 May 2009 20:03:09 +0000 (UTC)
Subject: fcntl and =?utf-8?b?c2lnaW5mb190?= in python
References: <148918f0904281356v534680dcmd03084fe255cb2d3@mail.gmail.com>
	<op.us4mtvitx6zn5v@lepton.softlabbsas.com.ar>
	<148918f0904291012j4c1ada35jcee6030b75b952d0@mail.gmail.com>
	<loom.20090430T233215-925@post.gmane.org>
	<148918f0904301637t5e63537atd85e2a475f4e069f@mail.gmail.com>
	<148918f0905011208u4946c377uce7603bb2e456370@mail.gmail.com>
	<148918f0905040903s7a5c7e5exc2968d0e65540d81@mail.gmail.com>
Message-ID: <loom.20090506T200140-367@post.gmane.org>

ma <mabdelkader <at> gmail.com> writes:
> 
> Ok! So, I decided to write a C-extension instead of using ctypes...
> 
> This works beautifully. Now, I want to release this to the public, so
> I'm thinking of making a bit of code cleanup. Should I just pack the
> entire siginfo_t struct, right now I just use the fd, into a
> dictionary and pass it to the python callback handler function? Maybe
> there might be some more suggestions to what data structures to use,
> so I'm open right now to any of them.

Could we have a look at your working prototype?

Philip J. Tait
http://subarutelescope.org



From mensanator at aol.com  Wed May  6 16:13:55 2009
From: mensanator at aol.com (Mensanator)
Date: Wed, 6 May 2009 13:13:55 -0700 (PDT)
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another 
	program)
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net> 
	<mailman.5154.1241632462.11746.python-list@python.org>
Message-ID: <a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>

On May 6, 12:54 pm, Tim Chase <python.l... at tim.thechases.com> wrote:
> > for windows this works:
> > (can't cut and paste from a dos box!###%*&!!!)
>
> Depending on how it was spawned, you can either right-click in
> the window and choose Mark/Paste (when marking, use <enter> to
> terminate the selection; and selections are blockwise rectangular
> rather than linewise or characterwise).  Alternatively, if you
> click on the system menu (the icon in the title-bar with
> resize/minimize/maximize/close/help), there should be an Edit
> submenu with the same options within.
>
> A pain, but at least feasible.

Less painful is to set the properties of the dos box:

Edit Options:
[x] Quick Edit mode

And when prompted, do "(.) modify shortcut that started this window"

After which, you can dispense with the menus (except when pasting),
just select the text and hit <enter>.

Makes a world of difference.

>
> HTH,
>
> -tkc



From davea at ieee.org  Wed May  6 16:29:23 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 06 May 2009 16:29:23 -0400
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another
	program)
In-Reply-To: <4A01CEC5.4090008@tim.thechases.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<4A01CEC5.4090008@tim.thechases.com>
Message-ID: <4A01F323.4040808@ieee.org>

Tim Chase wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">> for 
> windows this works:
>> (can't cut and paste from a dos box!###%*&!!!)
>
> Depending on how it was spawned, you can either right-click in the 
> window and choose Mark/Paste (when marking, use <enter> to terminate 
> the selection; and selections are blockwise rectangular rather than 
> linewise or characterwise).  Alternatively, if you click on the system 
> menu (the icon in the title-bar with 
> resize/minimize/maximize/close/help), there should be an Edit submenu 
> with the same options within.
>
> A pain, but at least feasible.
>
> HTH,
>
> -tkc
>
>
Note that if you like copy/paste, you can turn on "Quick Edit" mode in 
your cmd.exe windows.  From that same System menu on your DOS box, 
choose "Defaults".  From the first tab that box, enable "Quick Edit" 
checkbox.   This will change the default for subsequent DOS boxes.  You 
can change it just for the current one by using Properties in the same 
system menu.




From davea at ieee.org  Wed May  6 16:46:12 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 06 May 2009 16:46:12 -0400
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another
	program)
In-Reply-To: <a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<mailman.5154.1241632462.11746.python-list@python.org>
	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
Message-ID: <4A01F714.4020602@ieee.org>



Mensanator wrote:
> <snip>
>
> And when prompted, do "(.) modify shortcut that started this window"
>
> After which, you can dispense with the menus (except when pasting),
> just select the text and hit <enter>.
>
>   
To paste into a DOS box, once Quick Edit is enabled, use Right-Click.  
They keystrokes will be sent to the command editor.  Note that the 
interpretation is rather literal, so be careful if copy/pasting more 
than one line, or a line that was wrapped.




From emile at fenx.com  Wed May  6 17:04:44 2009
From: emile at fenx.com (Emile van Sebille)
Date: Wed, 06 May 2009 14:04:44 -0700
Subject: list comprehension question
In-Reply-To: <85d4am8hq4.fsf@agentultra.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>	<85ocucnbce.fsf@agentultra.com>	<mailman.4923.1241193638.11746.python-list@python.org>	<85ljpb8r1o.fsf@agentultra.com>	<mailman.5109.1241543371.11746.python-list@python.org>
	<85d4am8hq4.fsf@agentultra.com>
Message-ID: <gtsttq$k64$1@ger.gmane.org>

On 5/6/2009 6:48 AM J Kenneth King said...
> Emile van Sebille <emile at fenx.com> writes:
>> On 5/5/2009 9:15 AM J Kenneth King said...
>>>  The Python documentation discourages their use and I believe
>>> for good reason.
>> Can you provide a link for this?  I'd like to see specifically what's
>> being discouraged, as I'd be surprised to find routine usage frowned
>> upon.
> http://docs.python.org/tutorial/datastructures.html#nested-list-comprehensions
> 

Thanks.

> 
> "If you?ve got the stomach for it, list comprehensions can be
> nested. They are a powerful tool but ? like all powerful tools ? they
> need to be used carefully, if at all."

Yes, although this is in reference to nested list comprehensions.  Eg,

[xx for xx in [yy for yy in [zz for zz in iterable if z] if y] if x]

The section above on list comprehensions advocates their use saying:

"List comprehensions provide a concise way to create lists without 
resorting to use of map(), filter() and/or lambda. The resulting list 
definition tends often to be clearer than lists built using those 
constructs."

Emile



From rhodri at wildebst.demon.co.uk  Wed May  6 17:15:03 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 06 May 2009 22:15:03 +0100
Subject: Parsing text
In-Reply-To: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <op.uti1bdoba8ncjz@gnudebst>

On Wed, 06 May 2009 19:32:28 +0100, iainemsley <iainemsley at googlemail.com>  
wrote:

> Hi,
> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.

With neither a sample of your data nor the traceback you get, this is
going to require some crystal ball work.  Assuming that all you've got
is running text, I should warn you now that getting this right is a
hard task.  Getting it apparently right and having it fall over in a
heap or badly mangle the text is, unfortunately, very easy.

> for scene in text.split('Scene'):

Not a safe start.  This will split on the word "Scenery" as well, for
example, and doesn't guarantee you the start of a scene by a long way.

>     num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)

This is almost certainly not going to do what you expect, because all
those backslashes in the string are going to get processed as escape
characters before the string is ever passed to re.compile.  Even if
you fix that (by doubling the backslashes or making it a raw string),
I sincerely doubt that this is the regular expression you want.  As
escaped, it matches in sequence:

   * the start of the string
   * a space, tab, newline or other whitespace character.  Just the one.
   * the literal string "[0-9, "
   * either "i" or "I" repeated between 1 and four times
   * the literal string ", "
   * either "v" or "V"
   * the literal string "]"

Assuming you didn't mean to escape the open square bracket doesn't help:

   * the start of the string
   * one whitespace character
   * one of the following characters: 0123456789,iI{}vV

Also, what the heck is this doing *inside* the for loop?

>     textNum = num.match(scene)

If you're using re.match(), the "^" on the regular expression is
redundant.

>     if textNum:
>         print textNum

textNum is the match object, so printing it won't tell you much.  In
particular, it isn't going to produce well-formed XML.

>     else:
>         print "No scene number"

Nor will this.

>     m = '<div type="scene>'

Missing close double quotes after 'scene'.

>     m += scene
>     m += '<\div>'
>     print m

I'm seeing nothing here that should produce an error message that
has anything to do with NoneType.  Any chance of (a) a more accurate
code sample, (b) the traceback, or (c) sample data?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Wed May  6 17:20:29 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 06 May 2009 22:20:29 +0100
Subject: Self function
In-Reply-To: <op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <op.uti1kf0ga8ncjz@gnudebst>

On Wed, 06 May 2009 04:59:59 +0100, Gabriel Genellina  
<gagsl-py2 at yahoo.com.ar> wrote:

> En Tue, 05 May 2009 22:35:08 -0300, Rhodri James  
> <rhodri at wildebst.demon.co.uk> escribi?:
>> On Tue, 05 May 2009 21:43:16 +0100, <bearophileHUGS at lycos.com> wrote:
>>> wolfram.hinde...:
>
>>>> It is easy to change all references of the function name, except for
>>>> those in the function body itself? That needs some explantation.
>>>
>>> I can answer this. If I have a recursive function, I may want to
>>> create a similar function, so I copy and paste it, to later modify the
>>> copied version. Then to change its name I usually don't use a search &
>>> rename of its name into its block of code because it's usually
>>> useless. In non-recursive functions the name of the function is stated
>>> only once, at the top.
>>
>> I'm sorry, but while I'm mildly positive towards the proposal (and more
>> so towards Aaron's decorator), I don't buy this argument at all.  What
>> is broken about your editor's global search-and-replace function that
>> makes it "usually useless" for making these name changes?
>
> It happened to me sometimes. If a module defines some functions, and it  
> doesn't *use* them, why should I use a global search-and-replace to  
> rename something? Modifying the "def" line should be enough - unless the  
> function happens to be recursive.

So the answer to my question would be "nothing"?

> It's the DRY principle in action, the same argument as when decorators  
> where introduced: there should be no need to repeat the function name  
> again and again.

Unless of course you're using it again and again, which you are.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From python-list at smetj.net  Wed May  6 17:27:51 2009
From: python-list at smetj.net (J)
Date: Wed, 06 May 2009 23:27:51 +0200
Subject: SimpleXMLRPCServer and creating a new object on for each new client
	request.
Message-ID: <6de5adbe461e36d4756ae63194286e45@smetj.net>

Hi list,

My goals is to have concurrent and separated client sessions using xmlrpc.
Initially my though was that SimpleXMLRPCServer was able to create a new
object instance for each incoming request.
But this doesn't appear to be the case, unless I'm overlooking something,
if so please point me out.

Concider following simplified code


#!/usr/bin/python

from SimpleXMLRPCServer import SimpleXMLRPCServer
from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler
import random

# Restrict to a particular path.
class RequestHandler(SimpleXMLRPCRequestHandler):
    rpc_paths = ('/RPC2',)

# Create a simple example class
class Randomizer:
        def __init__(self):
                self.random=random.randrange(0,100000)
        def show_random(self):
                return self.random

# Create server
server = SimpleXMLRPCServer(("localhost",
8000),requestHandler=RequestHandler,allow_none=1)
server.register_introspection_functions()

server.register_instance(Randomizer())
server.serve_forever()



I start python interactively:
>>> import xmlrpclib
>>> session1=xmlrpclib.ServerProxy('http://localhost:8000')
>>> session2=xmlrpclib.ServerProxy('http://localhost:8000')
>>> print session1.show_random()
13930
>>> print session2.show_random()
13930
>>> 

I though that session1 and session2 would be 2 different Randomizer objects
each having a different result for self.random
But as the example shows this is not the case.
How can I solve this?

Thanks

Jelle



From mabdelkader at gmail.com  Wed May  6 17:36:02 2009
From: mabdelkader at gmail.com (ma)
Date: Wed, 6 May 2009 17:36:02 -0400
Subject: fcntl and siginfo_t in python
In-Reply-To: <loom.20090506T200140-367@post.gmane.org>
References: <148918f0904281356v534680dcmd03084fe255cb2d3@mail.gmail.com>
	<op.us4mtvitx6zn5v@lepton.softlabbsas.com.ar>
	<148918f0904291012j4c1ada35jcee6030b75b952d0@mail.gmail.com>
	<loom.20090430T233215-925@post.gmane.org>
	<148918f0904301637t5e63537atd85e2a475f4e069f@mail.gmail.com>
	<148918f0905011208u4946c377uce7603bb2e456370@mail.gmail.com>
	<148918f0905040903s7a5c7e5exc2968d0e65540d81@mail.gmail.com>
	<loom.20090506T200140-367@post.gmane.org>
Message-ID: <169B8277-4F9A-4DC3-B486-72796E239238@gmail.com>

Sure, I'll send you the source files when I get a chance!

--Sent from my iPhone

On May 6, 2009, at 4:03 PM, Philip <philip at subaru.naoj.org> wrote:

> ma <mabdelkader <at> gmail.com> writes:
>>
>> Ok! So, I decided to write a C-extension instead of using ctypes...
>>
>> This works beautifully. Now, I want to release this to the public, so
>> I'm thinking of making a bit of code cleanup. Should I just pack the
>> entire siginfo_t struct, right now I just use the fd, into a
>> dictionary and pass it to the python callback handler function? Maybe
>> there might be some more suggestions to what data structures to use,
>> so I'm open right now to any of them.
>
> Could we have a look at your working prototype?
>
> Philip J. Tait
> http://subarutelescope.org
>
> --
> http://mail.python.org/mailman/listinfo/python-list


From pavlovevidence at gmail.com  Wed May  6 17:48:16 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 6 May 2009 14:48:16 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5117.1241549976.11746.python-list@python.org>
	<ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
	<mailman.5133.1241578571.11746.python-list@python.org>
Message-ID: <4d8e738a-bc03-4598-8161-e584a4617699@r36g2000vbr.googlegroups.com>

On May 5, 7:55?pm, Dave Angel <da... at ieee.org> wrote:
> George Oliver wrote:
> > On May 5, 11:59 am, Dave Angel <da... at ieee.org> wrote:
>
> >> 1) forget about getattr() unless you have hundreds of methods in your
> >> map. ?The real question is why you need two maps. What good is the
> >> "command string" doing you? ? Why not just map the keyvalues directly
> >> into function objects?
>
> > Thanks for the reply Dave. I understand your example and it's what I
> > originally used. Here is more detail on what I'm doing now, I hope
> > this will explain my question better.
>
> > In the game I'm writing the player, monsters, items and so on are
> > instances of class Thing, like:
>
> > class Thing(object):
> > ? ? def __init__(self, x, y, name):
> > ? ? ? ? self.x, self.y = x, y
> > ? ? ? ? self.name = name
> > ? ? ? ? self.brain = None
>
> > Some Things have an instance of class Brain attached. The Brain
> > instance has a list of handlers, like:
>
> > class Brain(object):
> > ? ? def __init__(self):
> > ? ? ? ? self.handlers = []
>
> > A handler class defines some functionality for the Brain. Each Brain
> > has an update method like this:
>
> > def update(self, arguments):
> > ? ? for handler in self.handlers:
> > ? ? ? ? handler.update(arguments)
>
> > So on each pass through the main game loop, it calls the update method
> > of all the brains in the game, which run their handler update methods
> > to change the state of the game.
>
> > A handler would be something like a key input handler. The key input
> > handler is defined separately from the command handler in the case I
> > want to use a different method of input, for example a mouse or
> > joystick.
>
> > In the dictionary of key inputs I could map each input directly to a
> > function. However there is no instance name I can call the function
> > on, as I create a thing, add a brain, and add handlers to the brain
> > like this:
>
> > player = Thing(26, 16, 'player')
> > player.brain = Brain()
> > player.brain.add_handlers(
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? commandHandler(player.brain, player),
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? keyboardHandler(player.brain),
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? fovHandler(player.brain))
>
> > So what I'm wondering is how to reference the instance in each brain's
> > list of handlers when I want to map something like a key input to a
> > command, or what a better way might be to structure the code.
>
> ?>>
>
> >>player.brain.add_handlers(
> >> ? ? ? ? ? ? ? ? ? ? ? ? ? ?commandHandler(player.brain, player),
> >> ? ? ? ? ? ? ? ? ? ? ? ? ? ?keyboardHandler(player.brain),
> >> ? ? ? ? ? ? ? ? ? ? ? ? ? ?fovHandler(player.brain))
>
> You're executing commandHandler, and passing its return value into the
> add_handlers() method. ?So commandHandler is a function, not a method,
> and what is its relationship to anything that actually processes commands?

It seems to be a factory function.


> Sorry, your pseudo-code is so far from real code that I can't figure out
> what you're doing. ?So I guess I can't be any help till something else
> turns up to make it clearer. ?Maybe it's just me.

I think it's you--and probably a lot of other people who haven't ever
written games.  No offense.  As someone who's written games before I
will tell you that George's pseudo-code is not far from real code.
His overall approach is fairly typical of how games handle input,
although there are some problems in the details.


Carl Banks


From mensanator at aol.com  Wed May  6 17:49:17 2009
From: mensanator at aol.com (Mensanator)
Date: Wed, 6 May 2009 14:49:17 -0700 (PDT)
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another 
	program)
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net> 
	<mailman.5154.1241632462.11746.python-list@python.org>
	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
	<mailman.5167.1241642789.11746.python-list@python.org>
Message-ID: <82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>

On May 6, 3:46?pm, Dave Angel <da... at ieee.org> wrote:
> Mensanator wrote:
> > <snip>
>
> > And when prompted, do "(.) modify shortcut that started this window"
>
> > After which, you can dispense with the menus (except when pasting),
> > just select the text and hit <enter>.
>
> To paste into a DOS box, once Quick Edit is enabled, use Right-Click. ?
> They keystrokes will be sent to the command editor. ?Note that the
> interpretation is rather literal, so be careful if copy/pasting more
> than one line, or a line that was wrapped.

Well I'll be dipped. Didn't know you could do that.

Of course, since I learned how to call programs from the
script and capture their StdOut, I don't have much call for
cut/paste from dos windows. Hopefully, I'll remember that the
next time I need it.


From jelle at smetj.net  Wed May  6 17:52:47 2009
From: jelle at smetj.net (Jelle Smet)
Date: Wed, 06 May 2009 23:52:47 +0200
Subject: SimpleXMLRPCServer and creating a new object on for each new client
	request.
Message-ID: <add0e6668e04f13e877379d46c0958b0@smetj.net>

Hi list,

My goals is to have concurrent and separated client sessions using xmlrpc.
Initially my though was that SimpleXMLRPCServer was able to create a new
object instance for each incoming request.
But this doesn't appear to be the case, unless I'm overlooking something,
if so please point me out.

Concider following simplified code


#!/usr/bin/python

from SimpleXMLRPCServer import SimpleXMLRPCServer
from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler
import random

# Restrict to a particular path.
class RequestHandler(SimpleXMLRPCRequestHandler):
    rpc_paths = ('/RPC2',)

# Create a simple example class
class Randomizer:
        def __init__(self):
                self.random=random.randrange(0,100000)
        def show_random(self):
                return self.random

# Create server
server = SimpleXMLRPCServer(("localhost",
8000),requestHandler=RequestHandler,allow_none=1)
server.register_introspection_functions()

server.register_instance(Randomizer())
server.serve_forever()



I start python interactively:
>>> import xmlrpclib
>>> session1=xmlrpclib.ServerProxy('http://localhost:8000')
>>> session2=xmlrpclib.ServerProxy('http://localhost:8000')
>>> print session1.show_random()
13930
>>> print session2.show_random()
13930
>>> 

I though that session1 and session2 would be 2 different Randomizer objects
each having a different result for self.random
But as the example shows this is not the case.
How can I solve this?

Thanks

Jelle


From pavlovevidence at gmail.com  Wed May  6 18:07:42 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 6 May 2009 15:07:42 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5117.1241549976.11746.python-list@python.org>
	<ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
Message-ID: <42c18697-15ab-4813-8267-c416fae38642@p4g2000vba.googlegroups.com>

On May 5, 12:17?pm, George Oliver <georgeolive... at gmail.com> wrote:
> A handler would be something like a key input handler. The key input
> handler is defined separately from the command handler in the case I
> want to use a different method of input, for example a mouse or
> joystick.
>
> In the dictionary of key inputs I could map each input directly to a
> function. However there is no instance name I can call the function
> on, as I create a thing, add a brain, and add handlers to the brain
> like this:

What instance do you want to call the functions on?  This is the part
that confuses me.


> player = Thing(26, 16, 'player')
> player.brain = Brain()
> player.brain.add_handlers(
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? commandHandler(player.brain, player),
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? keyboardHandler(player.brain),
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? fovHandler(player.brain))
>
> So what I'm wondering is how to reference the instance in each brain's
> list of handlers when I want to map something like a key input to a
> command, or what a better way might be to structure the code.


I'm going to guess that you want the keyboardHandler to call method of
commandHandler.  There's no reason for commandHandler to be a handler
at all then: keyboardHandler is already handling it.

So here is how I would change it:

player = Thing(26,16,'player')
player.brain = Brain()
responder = commandResponder(player.brain,player)
player.brain.add_handlers(
    keyboardHandler(player.brain,responder),
    joystickHandler(player.brain,responder),
    fovHandler(player.brain),
    )


Carl Banks


From gallium.arsenide at gmail.com  Wed May  6 18:14:30 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Wed, 6 May 2009 15:14:30 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com> 
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
Message-ID: <a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>

On May 6, 3:29?am, MRAB <goo... at mrabarnett.plus.com> wrote:

> I have the feeling that if the number of rounds is restricted then the
> difference between the minimum and maximum number of byes could be 2
> because of the requirement that players shouldn't play each other more
> than once, meaning that the players have to be shuffled around a bit, so
> a player might play a week earlier or later than would otherwise be the
> case.

This is the feeling that I am getting also.  All my efforts to keep
everything as balanced as possible at all times (to be ready for the
"season" to end suddenly at any time) result in messy jams that could
otherwise be alleviated if I allowed temporary imbalances, knowing
that there are more weeks later to make them up.

John


From e.kroske at gmail.com  Wed May  6 18:25:48 2009
From: e.kroske at gmail.com (Evan Kroske)
Date: Wed, 06 May 2009 18:25:48 -0400
Subject: Python 2.6 worth the hassle?
Message-ID: <4A020E6C.5020406@gmail.com>

I'm planning on learning Python, and I'd like to know which version to 
start with. I know that Python 3.0 isn't ready for production and it 
doesn't have enough libraries yet, so I thought I should learn Python 
2.6. Unfortunately, installing Python 2.6 on my Linux distro (Ubuntu 
Intrepid Ibex) has given me lots of complicated problems I really don't 
want to deal with.

My essential question is "Is Python 2.6 similar enough to Python 3.0 to 
justify its complexity of installation?" Upgrading to Jaunty is NOT an 
option 
(http://welcome2obscurity.blogspot.com/2009/05/jaunty-jackalope-released-vista-all.html).

Best regards,
Evan Kroske
Undecided Python Student


From mirthyn at gmail.com  Wed May  6 18:32:58 2009
From: mirthyn at gmail.com (Ani)
Date: Wed, 6 May 2009 19:32:58 -0300
Subject: removing row from table. PyQT
Message-ID: <75097f100905061532y4685fed6ue7f19904a4964552@mail.gmail.com>

I'm trying to remove the selected rows from the table,
but it's not working, i've tried many ways, don't know what I'm missing.

code below:


class MonitorUi(QWidget):

    def __init__(self,parent = None):
        QWidget.__init__(self,parent)

        self._initalTable =
[["none","none","none"],["none","none","none"],["none","none","none"]]

        self.lista=""
        self.headerH =
["Id","UserName","Engine","Proj","FileToRender","StartFrame","EndFrame","Packets","Skip","Attr","Status"]

        self.setWindowTitle("RenderMonitor")
        self.setGeometry(150,150,1000,500)
        self.setWindowIcon(QIcon('monkey.png'))


        timer = QTimer(self)
        self.ItemEdit = QLineEdit()
        self.buttonRemove = QPushButton("remove")
        self.buttonRende = QPushButton("Rende!")
        self.tableWidget = QTableWidget(1000,11)



        layoutH = QHBoxLayout()
        layoutH.addWidget(self.ItemEdit)
        #layoutH.addStretch(1)
        layoutH.addWidget(self.buttonRemove)
        layoutH.addWidget(self.buttonRende)

        layoutV = QVBoxLayout()
        layoutV.addLayout(layoutH)
        layoutV.addWidget(self.tableWidget)


        self.setLayout(layoutV)

        self.connect(self.buttonRemove, SIGNAL("clicked()"), self.remove)
        self.connect(self.buttonRende, SIGNAL("clicked()"),
self.MsgServerRender)


        timer.start(1000)
        QObject.connect(timer, SIGNAL("timeout()"), self.displayTable)



    def setDataBridge(self,dataInst):
        self.lista = dataInst

    def clearTable(self):
        self.tableWidget.clear()

    def remove(self):
        print "removendo da tabela"
        #self.tableWidget.removeRow(self.tableView.selectedIndexes())
        self.tableWidget.removeRow(self.tableWidget.selectedRows)
#self.mapper.toNext()
#self.tableView.selectRow(self.mapper.currentIndex())

    def MsgServerRender(self):
        sender = ClientMsgRender()
        sender.sendTo("run")

    def displayTable(self):

        print "display table"
        self.tableWidget.setHorizontalHeaderLabels(self.headerH)
        self.headerV=[]
        list2= self.lista.getInfo()

        item = 0
        linha = 0
        while item < len(list2):

            #self.tableWidget = QTableWidget(item,9)
            self.headerV.append(("job" + str(item)))
            elemento = 0
            coluna = 0

            while elemento < 11 :
                str(list2[item][elemento])
                NewTableitem = QTableWidgetItem(list2[item][elemento])
                #NewTableitem.setFlags(Qt.ItemIsSelectable |
 Qt.ItemIsEnabled )#no editable item
                #NewTableitem.setFlags(Qt.ItemIsEnabled )#no editable item
                self.tableWidget.setItem(linha,coluna, NewTableitem)


                elemento += 1
                coluna += 1

            item += 1
            linha += 1

        self.tableWidget.setVerticalHeaderLabels(self.headerV)
-------------- next part --------------
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From kyrie at uh.cu  Wed May  6 18:33:20 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Wed, 06 May 2009 18:33:20 -0400
Subject: Self function
In-Reply-To: <op.uti1kf0ga8ncjz@gnudebst>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
	<op.uti1kf0ga8ncjz@gnudebst>
Message-ID: <1241649200.4a0210301f77e@mail.uh.cu>


Quoting Rhodri James <rhodri at wildebst.demon.co.uk>:

> >> I'm sorry, but while I'm mildly positive towards the proposal (and more
> >> so towards Aaron's decorator), I don't buy this argument at all.  What
> >> is broken about your editor's global search-and-replace function that
> >> makes it "usually useless" for making these name changes?
> >
> > It happened to me sometimes. If a module defines some functions, and it  
> > doesn't *use* them, why should I use a global search-and-replace to  
> > rename something? Modifying the "def" line should be enough - unless the  
> > function happens to be recursive.
> 
> So the answer to my question would be "nothing"?

Indeed, there is nothing broken with the search and replace feature of his
editor. When he is copying a non-recursive function, it is _useless_ to do a
search and replace. When he is copying a recursive function, it is _required_ to
do a search and replace.

So, the very same task requires you to either perform a task that will almost
always be useless (or even dangerous), or to read the source code to find out if
the function is recursive, so that you can use the search and replace only then.

(I know that the "problem" is present in almost all programming languages... but
that's not what is being discussed. Bearophile's concerns seem legitimate, and
you should not dismiss them so lightly just because there are ways to do more
work and hopefully avoid the problems. I'd say that the "problem" is even
aggravated in python, where the dynamic nature of the language makes it near to
impossible to build good refactoring tools) 

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie

-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From Scott.Daniels at Acm.Org  Wed May  6 18:41:00 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 06 May 2009 15:41:00 -0700
Subject: Copy & Paste in a Dos box
In-Reply-To: <mailman.5167.1241642789.11746.python-list@python.org>
References: <4A01AD6E.4010807@umbc.edu>
	<4A01CD29.3010507@hughes.net>	<mailman.5154.1241632462.11746.python-list@python.org>	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
	<mailman.5167.1241642789.11746.python-list@python.org>
Message-ID: <uoWdnYQnGaNQjZ_XnZ2dnUVZ_qKdnZ2d@pdx.net>

Dave Angel wrote:
> Mensanator wrote:
>> ... After which, you can dispense with the menus (except when pasting),
>> just select the text and hit <enter>.
>>
> To paste into a DOS box, once Quick Edit is enabled, use Right-Click.  
> They keystrokes will be sent to the command editor.  Note that the 
> interpretation is rather literal, so be careful if copy/pasting more 
> than one line, or a line that was wrapped.

Also, you can type into the cmd window:

     Alt-Space  E  P

Alt-Space
       <get to menu>
    E
       <Edit submenu>
    P
       <Paste>

--Scott David Daniels
Scott.Daniels at Acm.Org


From tjreedy at udel.edu  Wed May  6 18:52:22 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 06 May 2009 18:52:22 -0400
Subject: Python 2.6 worth the hassle?
In-Reply-To: <4A020E6C.5020406@gmail.com>
References: <4A020E6C.5020406@gmail.com>
Message-ID: <gtt4b7$7bc$1@ger.gmane.org>

Evan Kroske wrote:
> I'm planning on learning Python, and I'd like to know which version to 
> start with. I know that Python 3.0 isn't ready for production and it 

3.1 will be. The first beta will be out very soon and 3.1 in less than 2 
months.

> doesn't have enough libraries yet,

That will take longer.  I hope the improvement in 3.1 will inspire more 
conversions.

> so I thought I should learn Python 2.6. Unfortunately, installing Python 2.6 on my Linux distro (Ubuntu 
> Intrepid Ibex) has given me lots of complicated problems I really don't 
> want to deal with.
> 
> My essential question is "Is Python 2.6 similar enough to Python 3.0 to 
> justify its complexity of installation?" Upgrading to Jaunty is NOT an 
> option 
> (http://welcome2obscurity.blogspot.com/2009/05/jaunty-jackalope-released-vista-all.html). 

You could use 2.5 and write with an eye to the future.  Use 'object' or 
some derivative thereof as a base for all your classes.  Never use cmp() 
or .__cmp__().  Don't use string exceptions.  Look in 3.0 What's new for 
anything else to avoid.

tjr



From benjamin at python.org  Wed May  6 19:01:25 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Wed, 6 May 2009 18:01:25 -0500
Subject: [RELEASED] Python 3.1 beta 1
Message-ID: <1afaf6160905061601l1fac114ei4ffd0f4f35826640@mail.gmail.com>

On behalf of the Python development team, I'm thrilled to announce the first and
only beta release of Python 3.1.

Python 3.1 focuses on the stabilization and optimization of features and changes
Python 3.0 introduced.  For example, the new I/O system has been rewritten in C
for speed.  File system APIs that use unicode strings now handle paths with
undecodable bytes in them. [1] Other features include an ordered dictionary
implementation and support for ttk Tile in Tkinter.  For a more extensive list
of changes in 3.1, see http://doc.python.org/dev/py3k/whatsnew/3.1.html or
Misc/NEWS in the Python distribution.

Please note that this is a beta release, and as such is not suitable for
production environments.  We continue to strive for a high degree of quality,
but there are still some known problems and the feature sets have not been
finalized.  This beta is being released to solicit feedback and hopefully
discover bugs, as well as allowing you to determine how changes in 3.1 might
impact you.  If you find things broken or incorrect, please submit a bug report
at

     http://bugs.python.org

For more information and downloadable distributions, see the Python 3.1 website:

     http://www.python.org/download/releases/3.1/

See PEP 375 for release schedule details:

     http://www.python.org/dev/peps/pep-0375/



Enjoy,
-- Benjamin

Benjamin Peterson
benjamin at python.org
Release Manager
(on behalf of the entire python-dev team and 3.1's contributors)


From norseman at hughes.net  Wed May  6 19:02:06 2009
From: norseman at hughes.net (norseman)
Date: Wed, 06 May 2009 16:02:06 -0700
Subject: Copy & Paste in a Dos box
In-Reply-To: <2dc0c81b0905061112l32426cb8rafa3a86dca12810d@mail.gmail.com>
References: <4A01AD6E.4010807@umbc.edu>
	<4A01CD29.3010507@hughes.net>	<4A01CEC5.4090008@tim.thechases.com>
	<2dc0c81b0905061112l32426cb8rafa3a86dca12810d@mail.gmail.com>
Message-ID: <4A0216EE.8050007@hughes.net>

Shawn Milochik wrote:
> On Wed, May 6, 2009 at 1:54 PM, Tim Chase <python.list at tim.thechases.com> wrote:
>>> for windows this works:
>>> (can't cut and paste from a dos box!###%*&!!!)
>> Depending on how it was spawned, you can either right-click in the window
>> and choose Mark/Paste (when marking, use <enter> to terminate the selection;
>> and selections are blockwise rectangular rather than linewise or
>> characterwise).  Alternatively, if you click on the system menu (the icon in
>> the title-bar with resize/minimize/maximize/close/help), there should be an
>> Edit submenu with the same options within.
>>
>> A pain, but at least feasible.
> <snip>
> 
> I know I'm coming to the conversation late, but here's what I do*:
> 
> 1. Use Cygwin. (http://www.cygwin.com/)
> 2. Use PuttyCYG (http://code.google.com/p/puttycyg/)
> 
> That way, you can basically use PuTTY to shell into your Windows box.
> 
> Note: If you are familiar with the Linux command line, you will be in
> love with this solution. If you're a Windows-only type, then be
> forewarned that doing this will require you to type Unix/Linux
> commands (for the most part) instead of DOS commands.
> 
> *Disclaimer: I use a Mac and Linux. This is my workaround when forced
> to use Windows. Your environment preferences may vary.
> --
> http://mail.python.org/mailman/listinfo/python-list
===================================

Nope and no thanks.

I'm talking about a Dos Box on Win XP Pro
For Tim - I get junk from somewhere else in the system.
I recognize it from hours and many open/close boxes ago, but it's not 
what I 'swiped".

For Shawn - why would I want to run synthesizers? Or any other ...
(There is nothing wrong with Cygwin, just not on everybody's system.
Didn't come with the package.)

I write in Linux and test on other peoples Window$
                                              ^
                                              Thunderbird did not mark 
that as a miss spelling?!!!  Three cheers for them!

Objective - stick with out of the box to get way less install problems.



Steve


From tjreedy at udel.edu  Wed May  6 19:02:59 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 06 May 2009 19:02:59 -0400
Subject: About ODFPY links
In-Reply-To: <862e00220905060253j290672acu86f18fc1bcd6bb2a@mail.gmail.com>
References: <862e00220905060253j290672acu86f18fc1bcd6bb2a@mail.gmail.com>
Message-ID: <gtt4v4$8vg$1@ger.gmane.org>

shruti surve wrote:
> hey all,
>  For my project, i am using ODFpy open office spreadsheets. I am 
> creating ledgers in python ie.ledger.py <http://ie.ledger.py>.  So when 
> i run ledger.py, spreadsheet will be opened in open office. since ledger 
> is made of number of accounts, i am creating multiple tables for all 
> accounts in single spreadsheet. So, there are number of tables in one 
> spreadsheet.  Now i want create links in each table of spreadsheet so 
> that i can connect multiple tables. SO can anyone please tell me how to 
> create links in odfpy..

The general answer to such questions is to make a minimal doc in some 
ODF application such of OOo that has the desired feature, save, open the 
doc as a zip file (unless saved as xml) and extract the pieces as xml. 
Then find the text that represents that feature.  There is a close 
correspondance between the xml and the internal document object model 
created by odfpy (and OOo, etc).

In your case, make a spreadsheet with two table.  Give one one literal 
entry.  Give the other one entry that links to the first.  Then look in 
the xml to see how links are presented.  That should give a hint as to 
how to do the same in odfpy.  Then try to recreate the minimal doc with 
odfpy and look at the xml *it* produces.  If it looks similar enough, 
open with OOo to see what you get.

tjr



From norseman at hughes.net  Wed May  6 19:10:18 2009
From: norseman at hughes.net (norseman)
Date: Wed, 06 May 2009 16:10:18 -0700
Subject: Copy & Paste in a Dos box
In-Reply-To: <a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<mailman.5154.1241632462.11746.python-list@python.org>
	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
Message-ID: <4A0218DA.8080209@hughes.net>

Mensanator wrote:
> On May 6, 12:54 pm, Tim Chase <python.l... at tim.thechases.com> wrote:
>>> for windows this works:
>>> (can't cut and paste from a dos box!###%*&!!!)
>> Depending on how it was spawned, you can either right-click in
>> the window and choose Mark/Paste (when marking, use <enter> to
>> terminate the selection; and selections are blockwise rectangular
>> rather than linewise or characterwise).  Alternatively, if you
>> click on the system menu (the icon in the title-bar with
>> resize/minimize/maximize/close/help), there should be an Edit
>> submenu with the same options within.
>>
>> A pain, but at least feasible.
> 
> Less painful is to set the properties of the dos box:
> 
> Edit Options:
> [x] Quick Edit mode
> 
> And when prompted, do "(.) modify shortcut that started this window"
> 
> After which, you can dispense with the menus (except when pasting),
> just select the text and hit <enter>.
> 
> Makes a world of difference.
> 
>> HTH,
>>
>> -tkc
> 
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
===================
On a straight box - that doesn't work either.
The select all does, but paste yanked something from hours ago.
Yes - set as stated, closed and used icon to open box.

MicroSoft still need to soften its hard head and join the 21st century.

I love the ease of Linux.

One thing we do get from using both OS's - our first release code is 
much more solid as a result.

Steve


From gherron at islandtraining.com  Wed May  6 19:12:48 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Wed, 06 May 2009 16:12:48 -0700
Subject: Python 2.6 worth the hassle?
In-Reply-To: <4A020E6C.5020406@gmail.com>
References: <4A020E6C.5020406@gmail.com>
Message-ID: <4A021970.9090705@islandtraining.com>

Evan Kroske wrote:
> I'm planning on learning Python, and I'd like to know which version to 
> start with. I know that Python 3.0 isn't ready for production and it 
> doesn't have enough libraries yet, so I thought I should learn Python 
> 2.6. Unfortunately, installing Python 2.6 on my Linux distro (Ubuntu 
> Intrepid Ibex) has given me lots of complicated problems I really 
> don't want to deal with.

Just learn 2.5.  From the beginners point of view, 2.5 and 2.6 are 
virtually the same.  (If you work hard, you can find differences, but 
you did say you were a beginner -- so don't worry about the differences 
-- they are minor and evolutionary not revolutionary.)


Gary Herron


>
> My essential question is "Is Python 2.6 similar enough to Python 3.0 
> to justify its complexity of installation?" Upgrading to Jaunty is NOT 
> an option 
> (http://welcome2obscurity.blogspot.com/2009/05/jaunty-jackalope-released-vista-all.html). 
>
>
> Best regards,
> Evan Kroske
> Undecided Python Student
> -- 
> http://mail.python.org/mailman/listinfo/python-list



From martin.hellwig at dcuktec.org  Wed May  6 19:13:53 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 07 May 2009 00:13:53 +0100
Subject: SimpleXMLRPCServer and creating a new object on for each new
	client request.
In-Reply-To: <mailman.5173.1241647285.11746.python-list@python.org>
References: <mailman.5173.1241647285.11746.python-list@python.org>
Message-ID: <sKCdnS2oXZIuhJ_XnZ2dnUVZ8tKdnZ2d@bt.com>

Jelle Smet wrote:
> Hi list,
> 
> My goals is to have concurrent and separated client sessions using xmlrpc.
> Initially my though was that SimpleXMLRPCServer was able to create a new
> object instance for each incoming request.
> But this doesn't appear to be the case, unless I'm overlooking something,
> if so please point me out.
> 
> Concider following simplified code
> 
<cut code>
SimpleXMLRPCServer, is rather, well eh, simple and does not support 
sessions, which in an HTTP point of view makes sense (where XML-RPC is 
based on). So either build in some sort of session management or rewrite 
your functionality in such a ways that it isn't dependent on sessions 
(see my reimplementation after my sig).

-- 
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'

#! /usr/bin/env python
#'----------------example reimplementation----------------------------'
"XML RPC test"
import SocketServer
import SimpleXMLRPCServer
import random
import xmlrpclib
import threading


# Create a simple example class
class Randomizer(object):
     "Randomizer Docstring"
     def __init__(self):
         self.random_number = None

     def randomize(self):
         "create a new random number"
         self.random_number = random.randrange(0, 100000)

     def show_random(self):
         "show_random Docstring"
         self.randomize()
         return(self.random_number)

class Server(SocketServer.ThreadingMixIn,
              SimpleXMLRPCServer.SimpleXMLRPCServer):
     "Multi-threaded XML RPC Server"
     # pylint: disable-msg=R0904
     def __init__(self):
         address = ('localhost', 8000)
         SimpleXMLRPCServer.SimpleXMLRPCServer.__init__(self, address)
         self.allow_none = True
         self.register_instance(Randomizer())
         self.register_function(self.shutdown_service)
         self.register_introspection_functions()
     # pylint: enable-msg=R0904

     def shutdown_service(self):
         "Stop server"
         self.shutdown()


class Thread(threading.Thread):
     "Run Server in a thread for testing purposes"
     def run(self):
         "Run the service"
         service = Server()
         service.serve_forever()

if __name__ == '__main__':
     URL_PORT = 'http://localhost:8000'
     TEST_THREAD = Thread()
     TEST_THREAD.start()
     SESSION1 = xmlrpclib.ServerProxy(URL_PORT)
     SESSION2 = xmlrpclib.ServerProxy(URL_PORT)
     print(SESSION1.show_random())
     print(SESSION2.show_random())
     SESSION_STOP = xmlrpclib.ServerProxy(URL_PORT)
     SESSION_STOP.shutdown_service()
#'----------------example reimplementation----------------------------'


From google at mrabarnett.plus.com  Wed May  6 19:15:27 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 07 May 2009 00:15:27 +0100
Subject: Copy & Paste in a Dos box
In-Reply-To: <82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<mailman.5154.1241632462.11746.python-list@python.org>	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>	<mailman.5167.1241642789.11746.python-list@python.org>
	<82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>
Message-ID: <4A021A0F.1040800@mrabarnett.plus.com>

Mensanator wrote:
> On May 6, 3:46 pm, Dave Angel <da... at ieee.org> wrote:
>> Mensanator wrote:
>>> <snip>
>>> And when prompted, do "(.) modify shortcut that started this window"
>>> After which, you can dispense with the menus (except when pasting),
>>> just select the text and hit <enter>.
>> To paste into a DOS box, once Quick Edit is enabled, use Right-Click.  
>> They keystrokes will be sent to the command editor.  Note that the
>> interpretation is rather literal, so be careful if copy/pasting more
>> than one line, or a line that was wrapped.
> 
> Well I'll be dipped. Didn't know you could do that.
> 
> Of course, since I learned how to call programs from the
> script and capture their StdOut, I don't have much call for
> cut/paste from dos windows. Hopefully, I'll remember that the
> next time I need it.
> 
That's new to me too!

You probably already know that if you drag-and-drop a file onto the
window you get its path.


From amrbekhit at gmail.com  Wed May  6 19:23:14 2009
From: amrbekhit at gmail.com (Amr)
Date: Wed, 6 May 2009 16:23:14 -0700 (PDT)
Subject: Could this expression parser be more 'Pythonic'?
Message-ID: <e8f3a550-647b-4ce2-bae3-c160e42e5439@j12g2000vbl.googlegroups.com>

Hello all,

I've been spending the last few weeks learning Python, and I've just
started to use it to write a simple BASIC compiler. I'm writing a
mathematical expression parser and wrote a function that would take a
string and split it into high level tokens.

The code can be found at http://pastebin.com/f757252ec (have a look at
the function tokenize).

I was interested to see if the tokenize function could be written in a
better way, so as to make better use of the Python language and
libraries. One thing that sprung to mind was whether it would be a
good idea to perhaps take advantage of regular expressions. I had a
look at a few compiler sites and regexps seem to come into that role
quite a bit. I've only done a little work on regexps and they seem
very powerful, but can easily get out of control!

So, any suggestions as to how to make better use of the language
writing something like this?

Thanks,

--Amr


From norseman at hughes.net  Wed May  6 19:28:34 2009
From: norseman at hughes.net (norseman)
Date: Wed, 06 May 2009 16:28:34 -0700
Subject: Copy & Paste in a Dos box
In-Reply-To: <4A01F323.4040808@ieee.org>
References: <4A01AD6E.4010807@umbc.edu>
	<4A01CD29.3010507@hughes.net>	<4A01CEC5.4090008@tim.thechases.com>
	<4A01F323.4040808@ieee.org>
Message-ID: <4A021D22.5010508@hughes.net>

Dave Angel wrote:
> Tim Chase wrote:
>> <div class="moz-text-flowed" style="font-family: -moz-fixed">> for 
>> windows this works:
>>> (can't cut and paste from a dos box!###%*&!!!)
>>
>> Depending on how it was spawned, you can either right-click in the 
>> window and choose Mark/Paste (when marking, use <enter> to terminate 
>> the selection; and selections are blockwise rectangular rather than 
>> linewise or characterwise).  Alternatively, if you click on the system 
>> menu (the icon in the title-bar with 
>> resize/minimize/maximize/close/help), there should be an Edit submenu 
>> with the same options within.
>>
>> A pain, but at least feasible.
>>
>> HTH,
>>
>> -tkc
>>
>>
> Note that if you like copy/paste, you can turn on "Quick Edit" mode in 
> your cmd.exe windows.  From that same System menu on your DOS box, 
> choose "Defaults".  From the first tab that box, enable "Quick Edit" 
> checkbox.   This will change the default for subsequent DOS boxes.  You 
> can change it just for the current one by using Properties in the same 
> system menu.
> 
> 
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 
====================

HuMMMMMM - Dave's use of cmd.exe as different from Dos Box points out a 
miss name on my part. I should have said cmd.exe originally.

Yes - I use dosemu on Linux Slackware 10.2 with enlightenment 16.2 and 
swipe/paste works as it should. (Of course gpm is loaded. That's a must. :)

I have been cutting back. Used to have 6 keyboards going at once. (well 
in packet passing mode shall we say? When computers were slower. :) 
Down to two close by and two across the way. One Solaris, two Linux, one 
Win XP.  Gotta keep the Win machine nearby. It needs its daily crash. I 
have learned to stick to 'stock' setups or pay a heavy price at "show time".

I tried the settings again just now.
I did both Properties and Default and made sure they were set the same.
I did the --- for icon --- and killed the open box and clicked the icon 
and swiped and pasted to wordpad.  IT FINALLY WORKED!!!

Hadn't intended to start such a rash of dialog, but I benefited too!

Thanks guys!!!


Steve


From mensanator at aol.com  Wed May  6 19:38:37 2009
From: mensanator at aol.com (Mensanator)
Date: Wed, 6 May 2009 16:38:37 -0700 (PDT)
Subject: Copy & Paste in a Dos box
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net> 
	<mailman.5154.1241632462.11746.python-list@python.org>
	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
	<mailman.5167.1241642789.11746.python-list@python.org>
	<82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>
	<mailman.5182.1241651712.11746.python-list@python.org>
Message-ID: <6640b734-80a7-4292-8223-7c00f5538261@r3g2000vbp.googlegroups.com>

On May 6, 6:15?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Mensanator wrote:
> > On May 6, 3:46 pm, Dave Angel <da... at ieee.org> wrote:
> >> Mensanator wrote:
> >>> <snip>
> >>> And when prompted, do "(.) modify shortcut that started this window"
> >>> After which, you can dispense with the menus (except when pasting),
> >>> just select the text and hit <enter>.
> >> To paste into a DOS box, once Quick Edit is enabled, use Right-Click. ?
> >> They keystrokes will be sent to the command editor. ?Note that the
> >> interpretation is rather literal, so be careful if copy/pasting more
> >> than one line, or a line that was wrapped.
>
> > Well I'll be dipped. Didn't know you could do that.
>
> > Of course, since I learned how to call programs from the
> > script and capture their StdOut, I don't have much call for
> > cut/paste from dos windows. Hopefully, I'll remember that the
> > next time I need it.
>
> That's new to me too!
>
> You probably already know that if you drag-and-drop a file onto the
> window you get its path.

Damn! I may just go back to using Python from the command prompt
instead of using IDLE.

On second thought, IDLE is way too useful for indenting, dedenting,
commenting and uncommenting blocks of code. Can't go back to using
Notepad.



From tomf.sessile at gmail.com  Wed May  6 19:40:19 2009
From: tomf.sessile at gmail.com (TomF)
Date: Wed, 6 May 2009 16:40:19 -0700
Subject: Simple way of handling errors
Message-ID: <2009050616401916807-tomfsessile@gmailcom>

As a relative newcomer to Python, I like it a lot but I'm dismayed at 
the difficulty of handling simple errors.  In Perl if you want to 
anticipate a file-not-found error you can simply do:

open($file)  or die("open($file): $!");

and you get an intelligible error message.  In Python, to get the same 
thing it appears you need at least:

try:
    f=open(file)
except IOError, err:
    print "open(%s): got %s" % (file, err.strerror)
    exit(-1)

Is there a simpler interface or idiom for handling such errors?  I 
appreciate that Python's exception handling is much more sophisticated 
but often I don't need it.

-Tom



From DustanGroups at gmail.com  Wed May  6 19:41:25 2009
From: DustanGroups at gmail.com (Dustan)
Date: Wed, 6 May 2009 16:41:25 -0700 (PDT)
Subject: How do I escape slashes the string formatting operator? (or: why is 
	it behaving this way?)
Message-ID: <c30ba5fa-72bb-4d55-89f9-840acb10166c@b1g2000vbc.googlegroups.com>

Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
(Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> 'HELP!%(xyz)/' % {'xyz':' PLEASE! '}
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: unsupported format character '/' (0x2f) at index 11
>>>

It doesn't like the forward slash after the closed parentheses. I
don't know what it is expecting, but I need that slash there
(obviously this is a simplified example).

All help appreciated.


From marek.rocki at wp.pl  Wed May  6 19:51:57 2009
From: marek.rocki at wp.pl (marek.rocki at wp.pl)
Date: Wed, 6 May 2009 16:51:57 -0700 (PDT)
Subject: How do I escape slashes the string formatting operator? (or: why 
	is it behaving this way?)
References: <c30ba5fa-72bb-4d55-89f9-840acb10166c@b1g2000vbc.googlegroups.com>
Message-ID: <73c3f3a0-9fda-4eab-b46b-2cbe3f4baf1f@v17g2000vbb.googlegroups.com>

Dustan napisa?(a):
> Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
> (Intel)] on
> win32
> Type "help", "copyright", "credits" or "license" for more information.
> >>> 'HELP!%(xyz)/' % {'xyz':' PLEASE! '}
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> ValueError: unsupported format character '/' (0x2f) at index 11
> >>>
>
> It doesn't like the forward slash after the closed parentheses. I
> don't know what it is expecting, but I need that slash there
> (obviously this is a simplified example).
>
> All help appreciated.

Strign formatting docs (http://docs.python.org/library/
stdtypes.html#string-formatting) say that specifying a conversion type
is mandatory. So you actually should write something like:
'HELP!%(xyz)s/' % {'xyz':' PLEASE! '}


From DustanGroups at gmail.com  Wed May  6 19:58:42 2009
From: DustanGroups at gmail.com (Dustan)
Date: Wed, 6 May 2009 16:58:42 -0700 (PDT)
Subject: How do I escape slashes the string formatting operator? (or: why 
	is it behaving this way?)
References: <c30ba5fa-72bb-4d55-89f9-840acb10166c@b1g2000vbc.googlegroups.com>
	<73c3f3a0-9fda-4eab-b46b-2cbe3f4baf1f@v17g2000vbb.googlegroups.com>
Message-ID: <8a4c5d87-9a8b-479a-991c-38704787042a@s31g2000vbp.googlegroups.com>

On May 6, 6:51?pm, marek.ro... at wp.pl wrote:
> Dustan napisa?(a):
>
> > Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
> > (Intel)] on
> > win32
> > Type "help", "copyright", "credits" or "license" for more information.
> > >>> 'HELP!%(xyz)/' % {'xyz':' PLEASE! '}
> > Traceback (most recent call last):
> > File "<stdin>", line 1, in <module>
> > ValueError: unsupported format character '/' (0x2f) at index 11
>
> > It doesn't like the forward slash after the closed parentheses. I
> > don't know what it is expecting, but I need that slash there
> > (obviously this is a simplified example).
>
> > All help appreciated.
>
> Strign formatting docs (http://docs.python.org/library/
> stdtypes.html#string-formatting) say that specifying a conversion type
> is mandatory. So you actually should write something like:
> 'HELP!%(xyz)s/' % {'xyz':' PLEASE! '}

Thanks. That seems to have worked nicely.


From google at mrabarnett.plus.com  Wed May  6 20:01:46 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 07 May 2009 01:01:46 +0100
Subject: removing row from table. PyQT
In-Reply-To: <75097f100905061532y4685fed6ue7f19904a4964552@mail.gmail.com>
References: <75097f100905061532y4685fed6ue7f19904a4964552@mail.gmail.com>
Message-ID: <4A0224EA.7040108@mrabarnett.plus.com>

Ani wrote:
> I'm trying to remove the selected rows from the table,
> but it's not working, i've tried many ways, don't know what I'm missing.
> 
> code below:
> 
[snip]

>     def remove(self):    
>         print "removendo da tabela"
>         #self.tableWidget.removeRow(self.tableView.selectedIndexes())
>         self.tableWidget.removeRow(self.tableWidget.selectedRows)
> #self.mapper.toNext()
> #self.tableView.selectRow(self.mapper.currentIndex())
> 
[snip]
 From the name I'd say that removeRow() can remove only a single row at a
time. Try removing the rows one at a time, in reverse order (from
highest to lowest index).



From googler.1.webmaster at spamgourmet.com  Wed May  6 20:13:29 2009
From: googler.1.webmaster at spamgourmet.com (googler.1.webmaster at spamgourmet.com)
Date: Wed, 6 May 2009 17:13:29 -0700 (PDT)
Subject: Threading and GIL
Message-ID: <60538e1c-47ea-4120-bc91-a9dcebd8f14b@r34g2000vbi.googlegroups.com>

Hi!

I have a big problem I can't solve and I hope anyone of you can help
me. I use the Python C API and in C++ I have a class which represets a
thread object, similiar to the thread class of the known Python Thread
class but with some needed additions so thats the reason why I have to
built my own. Well, this is the problem.

There is a method called Thread::End() which I can call in Python. But
now the End() Function waits until the "Main" Function of my C++ class
is done, but in this method I want to ensure the Global Interpreter
Lock but this is already locked by the Thread which executes the End()
command. So both is waiting and stops. The thread which calls the End
() method is waiting for the finish of the Main() method of the Thread
Class and the Main-Method in the other thread waits for the thread of
the End() command that this is done - welcome Deadlock.

Any suggestions what I have to do? Thank you veeery much for you help,
otherwise I become really crazy here because this is the first time I
have such a problem.


Bye :)


From davea at ieee.org  Wed May  6 20:15:11 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 06 May 2009 20:15:11 -0400
Subject: Copy & Paste in a Dos box (was: Pyhton script to call another
	program)
In-Reply-To: <82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<mailman.5154.1241632462.11746.python-list@python.org>	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>	<mailman.5167.1241642789.11746.python-list@python.org>
	<82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>
Message-ID: <4A02280F.9010606@ieee.org>

Mensanator wrote:
> On May 6, 3:46 pm, Dave Angel <da... at ieee.org> wrote:
>   
>> Mensanator wrote:
>>     
>>> <snip>
>>>       
>>> And when prompted, do "(.) modify shortcut that started this window"
>>>       
>>> After which, you can dispense with the menus (except when pasting),
>>> just select the text and hit <enter>.
>>>       
>> To paste into a DOS box, once Quick Edit is enabled, use Right-Click.  
>> They keystrokes will be sent to the command editor.  Note that the
>> interpretation is rather literal, so be careful if copy/pasting more
>> than one line, or a line that was wrapped.
>>     
>
> Well I'll be dipped. Didn't know you could do that.
>
> Of course, since I learned how to call programs from the
> script and capture their StdOut, I don't have much call for
> cut/paste from dos windows. Hopefully, I'll remember that the
> next time I need it.
>
>   
As long as we're in Quick Edit mode, another trick is that you can 
double-click on a "word" in a DOS box to select it and copy to 
clipboard.  Obviously it isn't always the exact string you want, but 
sometimes it beats dragging the mouse over the text.




From davea at ieee.org  Wed May  6 20:29:42 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 06 May 2009 20:29:42 -0400
Subject: Copy & Paste in a Dos box
In-Reply-To: <4A0218DA.8080209@hughes.net>
References: <4A01AD6E.4010807@umbc.edu>
	<4A01CD29.3010507@hughes.net>	<mailman.5154.1241632462.11746.python-list@python.org>	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
	<4A0218DA.8080209@hughes.net>
Message-ID: <4A022B76.4040507@ieee.org>

norseman wrote:
> <snip>
> On a straight box - that doesn't work either.
> The select all does, but paste yanked something from hours ago.
>
> <snip>
Once you have Quick Edit enabled, paste will work using right-click.  If 
it got something from hours ago, then that must be the last time you 
copied anything to the real clipboard.  Note that some applications use 
a private clipboard to give extra features (like multiple clipboxes).  
But I suspect your real problem is you thought you did a copy to the 
clipboard from the DOS box, and you did not.

When you drag the mouse over the box, you *select* text, but do not copy 
it to the clipboard.  That doesn't happen till your right-click.

Then *another* right-click without anything selected will insert that 
new text into the command line.

Try the following on a DOS box (after enabling Quick Edit).  
Double-click on a "word".  Then right click *twice* to get it to the 
command line.




From pavlovevidence at gmail.com  Wed May  6 20:30:48 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 6 May 2009 17:30:48 -0700 (PDT)
Subject: Threading and GIL
References: <60538e1c-47ea-4120-bc91-a9dcebd8f14b@r34g2000vbi.googlegroups.com>
Message-ID: <a8f972ee-4594-493d-8b53-4a037c0211c0@n4g2000vba.googlegroups.com>

On May 6, 5:13?pm, googler.1.webmas... at spamgourmet.com wrote:
> Hi!
>
> I have a big problem I can't solve and I hope anyone of you can help
> me. I use the Python C API and in C++ I have a class which represets a
> thread object, similiar to the thread class of the known Python Thread
> class but with some needed additions so thats the reason why I have to
> built my own. Well, this is the problem.
>
> There is a method called Thread::End() which I can call in Python. But
> now the End() Function waits until the "Main" Function of my C++ class
> is done, but in this method I want to ensure the Global Interpreter
> Lock but this is already locked by the Thread which executes the End()
> command. So both is waiting and stops. The thread which calls the End
> () method is waiting for the finish of the Main() method of the Thread
> Class and the Main-Method in the other thread waits for the thread of
> the End() command that this is done - welcome Deadlock.
>
> Any suggestions what I have to do? Thank you veeery much for you help,
> otherwise I become really crazy here because this is the first time I
> have such a problem.
>
> Bye :)

You can try the PyGILState_Ensure and PyGILState_Release macros (see
PEP 311, http://www.python.org/dev/peps/pep-0311/ for more
information).

Make sure you have the GIL whenever you make any calls into Python
(with a couple exceptions) and make sure you DON'T have the GIL when
creating or deleting threads.  In fact, I can't think of any reason
why it wouldn't work to ensure a GIL state first thing after the
thread starts and to release it right before the thread ends.

Carl Banks


From lists at cheimes.de  Wed May  6 20:39:23 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 07 May 2009 02:39:23 +0200
Subject: Python 2.6 worth the hassle?
In-Reply-To: <4A020E6C.5020406@gmail.com>
References: <4A020E6C.5020406@gmail.com>
Message-ID: <gttajs$lp5$1@ger.gmane.org>

Evan Kroske schrieb:
> I'm planning on learning Python, and I'd like to know which version to
> start with. I know that Python 3.0 isn't ready for production and it
> doesn't have enough libraries yet, so I thought I should learn Python
> 2.6. Unfortunately, installing Python 2.6 on my Linux distro (Ubuntu
> Intrepid Ibex) has given me lots of complicated problems I really don't
> want to deal with.

It's rather easy to install Python 2.6 on Ubuntu 8.10 if you know how to
do it right:

# get all dependencies and necessary header files
sudo apt-get build-dep python2.5

# download and extract it
curl http://www.python.org/ftp/python/2.6.2/Python-2.6.2.tgz | tar -xzv

# Python is compiled with UCS 4 on all Debian systems
cd Python-2.6.2
./configure --enable-unicode=ucs4 --prefix=/usr/local

# compile it
make

# use altinstall so you don't overwrite the python command
# and just install the python2.6 command
sudo make altinstall

Now you have Python 2.6.2 in /usr/local

In order to remove it complete follow the instructions of my blog:
http://lipyrary.blogspot.com/2009/04/ubuntu-904-jaunty-and-python.html

Christian



From giuott at gmail.com  Wed May  6 20:39:32 2009
From: giuott at gmail.com (Giuseppe Ottaviano)
Date: Thu, 7 May 2009 02:39:32 +0200
Subject: [ANN] BPT (Boxed Package Tool) 0.3
Message-ID: <B3B33797-72A2-4C9A-B22C-1FDAB8256215@gmail.com>

Hi all,
I am happy to announce BPT 0.3

http://pypi.python.org/pypi/bpt

This release solves some important bugs, and the documentation has  
less TODOs.

Version 0.3
===========

- Improved documentation

- Fixed a bug that prevented the ``env`` script to be ``source``\'d
   (Works only with bash >= 3.0)

- Fixed a bug in the creation of symlinks that broken relocatability.

- ``env`` script does no more rely on GNU's ``readlink``, that is not
   present in vanilla OSX

- Other minor fixes

What is BPT
===========

BPT is a Python library (``bpt``) and a command line application
(``box``) to create and manage isolated enviroments, or *boxes*.

- Boxes are *relocatable*, which means that they can be moved to a
   different directory or even distributed to other machines (provided
   that the architecture is compatible).

- Packages inside the box can be easily disabled, enabled and removed,
   so that different versions of the same software can be installed
   simultaneously, allowing to switch between them.

- Boxes can be *nested*, in the sense that it is possible to activate
   a box environment while inside another box environment, so that all
   the packages installed in both boxes are available, and so on.

BPT is similar in some ways to `virtualenv
<http://pypi.python.org/pypi/virtualenv>`_, but it is not restricted
to Python packages, allowing to install virtually any Unix
software. It also takes some ideas from `jhbuild
<http://live.gnome.org/Jhbuild>`_, but without the dependency
resolution and automatic downloading machinery, and the ``bpt-rules``
format is inspired by `Gentoo <http://www.gentoo.org/>`_'s ebuilds.

Enjoy,
Giuseppe Ottaviano


From davea at ieee.org  Wed May  6 20:56:30 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 06 May 2009 20:56:30 -0400
Subject: Copy & Paste in a Dos box
In-Reply-To: <6640b734-80a7-4292-8223-7c00f5538261@r3g2000vbp.googlegroups.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<mailman.5154.1241632462.11746.python-list@python.org>	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>	<mailman.5167.1241642789.11746.python-list@python.org>	<82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>	<mailman.5182.1241651712.11746.python-list@python.org>
	<6640b734-80a7-4292-8223-7c00f5538261@r3g2000vbp.googlegroups.com>
Message-ID: <4A0231BE.50603@ieee.org>

Mensanator wrote:
> On May 6, 6:15 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>   
>> Mensanator wrote:
>>     
>>> On May 6, 3:46 pm, Dave Angel <da... at ieee.org> wrote:
>>>       
>>>> Mensanator wrote:
>>>>         
>>>>> <snip>
>>>>> And when prompted, do "(.) modify shortcut that started this window"
>>>>> After which, you can dispense with the menus (except when pasting),
>>>>> just select the text and hit <enter>.
>>>>>           
>>>> To paste into a DOS box, once Quick Edit is enabled, use Right-Click.  
>>>> They keystrokes will be sent to the command editor.  Note that the
>>>> interpretation is rather literal, so be careful if copy/pasting more
>>>> than one line, or a line that was wrapped.
>>>>         
>>> Well I'll be dipped. Didn't know you could do that.
>>>       
>>> Of course, since I learned how to call programs from the
>>> script and capture their StdOut, I don't have much call for
>>> cut/paste from dos windows. Hopefully, I'll remember that the
>>> next time I need it.
>>>       
>> That's new to me too!
>>
>> You probably already know that if you drag-and-drop a file onto the
>> window you get its path.
>>     
>
> Damn! I may just go back to using Python from the command prompt
> instead of using IDLE.
>
> On second thought, IDLE is way too useful for indenting, dedenting,
> commenting and uncommenting blocks of code. Can't go back to using
> Notepad.
>
>
>   
When I started with Python, I was using Metapad for editing.  Although 
it doesn't help with commenting-blocks, it's much better than Notepad 
for all purposes I used.

Then I discovered Komodo.  Although not cheap, it's a great IDE for my 
uses.  And there's a free version called Komodo-Edit, which is missing 
the debugger but otherwise may be quite useful.




From rhodri at wildebst.demon.co.uk  Wed May  6 20:59:02 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 07 May 2009 01:59:02 +0100
Subject: Self function
In-Reply-To: <1241649200.4a0210301f77e@mail.uh.cu>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
	<op.uti1kf0ga8ncjz@gnudebst> <1241649200.4a0210301f77e@mail.uh.cu>
Message-ID: <op.utjbooaya8ncjz@gnudebst>

On Wed, 06 May 2009 23:33:20 +0100, Luis Alberto Zarrabeitia Gomez  
<kyrie at uh.cu> wrote:

> Quoting Rhodri James <rhodri at wildebst.demon.co.uk>:
>> So the answer to my question would be "nothing"?
>
> Indeed, there is nothing broken with the search and replace feature of  
> his editor. When he is copying a non-recursive function, it is
> _useless_ to do a search and replace. When he is copying a recursive
> function, it is _required_ to do a search and replace.

On the contrary, it's merely not very useful for a non-recursive
function.  It still changes the function's name, which was one of the
objectives.  Seriously, the lack of effort in (say) doing a quick
incremental search for the function's name is a no-brainer.

> So, the very same task requires you to either perform a task that will  
> almost always be useless (or even dangerous), or to read the source code
> to find out if the function is recursive, so that you can use the search
> and replace only then.

If you're copying code without reading it, you're going to get bitten
anyway some time.  My sympathy is still limited.

> (I know that the "problem" is present in almost all programming  
> languages... but that's not what is being discussed. Bearophile's
> concerns seem legitimate, and you should not dismiss them so lightly
> just because there are ways to do more work and hopefully avoid the
> problems. I'd say that the "problem" is even aggravated in python,
> where the dynamic nature of the language makes it near to
> impossible to build good refactoring tools)

As with that other great "problem" of python, the lack of private
class attributes, a tiny amount of self-discipline solves 90% of the
issues.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From benjamin at python.org  Wed May  6 21:32:47 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Wed, 6 May 2009 20:32:47 -0500
Subject: [RELEASED] Python 3.1 beta 1
Message-ID: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com>

On behalf of the Python development team, I'm thrilled to announce the first and
only beta release of Python 3.1.

Python 3.1 focuses on the stabilization and optimization of features and changes
Python 3.0 introduced.  For example, the new I/O system has been rewritten in C
for speed.  File system APIs that use unicode strings now handle paths with
undecodable bytes in them. [1] Other features include an ordered dictionary
implementation and support for ttk Tile in Tkinter.  For a more extensive list
of changes in 3.1, see http://doc.python.org/dev/py3k/whatsnew/3.1.html or
Misc/NEWS in the Python distribution.

Please note that this is a beta release, and as such is not suitable for
production environments.  We continue to strive for a high degree of quality,
but there are still some known problems and the feature sets have not been
finalized.  This beta is being released to solicit feedback and hopefully
discover bugs, as well as allowing you to determine how changes in 3.1 might
impact you.  If you find things broken or incorrect, please submit a bug report
at

    http://bugs.python.org

For more information and downloadable distributions, see the Python 3.1 website:

    http://www.python.org/download/releases/3.1/

See PEP 375 for release schedule details:

    http://www.python.org/dev/peps/pep-0375/



Enjoy,
-- Benjamin

Benjamin Peterson
benjamin at python.org
Release Manager
(on behalf of the entire python-dev team and 3.1's contributors)


From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 21:34:18 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 01:34:18 GMT
Subject: Python 2.6 worth the hassle?
References: <mailman.5174.1241648774.11746.python-list@python.org>
Message-ID: <pan.2009.05.07.01.34.17@REMOVE.THIS.cybersource.com.au>

On Wed, 06 May 2009 18:25:48 -0400, Evan Kroske wrote:

> I'm planning on learning Python, and I'd like to know which version to
> start with. I know that Python 3.0 isn't ready for production and it
> doesn't have enough libraries yet, so I thought I should learn Python
> 2.6. Unfortunately, installing Python 2.6 on my Linux distro (Ubuntu
> Intrepid Ibex) has given me lots of complicated problems I really don't
> want to deal with.

What happens if you use the altinstall option and install from source?


> My essential question is "Is Python 2.6 similar enough to Python 3.0 to
> justify its complexity of installation?" Upgrading to Jaunty is NOT an
> option
> (http://welcome2obscurity.blogspot.com/2009/05/jaunty-jackalope-
released-vista-all.html).

Are you saying that Intrepid uses Python3.0 as it's default Python?

If not, then just use the default Python installed. Possibly Python 2.5. 
The differences between 2.5 and 2.6 are minor.


-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 21:35:12 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 01:35:12 GMT
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5109.1241543371.11746.python-list@python.org>
	<85d4am8hq4.fsf@agentultra.com>
Message-ID: <pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>

On Wed, 06 May 2009 09:48:51 -0400, J Kenneth King wrote:

> Emile van Sebille <emile at fenx.com> writes:
> 
>> On 5/5/2009 9:15 AM J Kenneth King said...
>>
>>> List comprehensions can make a reader of your code apprehensive
>>> because it can read like a run-on sentence and thus be difficult to
>>> parse. The Python documentation discourages their use and I believe
>>> for good reason.
>>
>> Can you provide a link for this?  I'd like to see specifically what's
>> being discouraged, as I'd be surprised to find routine usage frowned
>> upon.
>>
>> Emile
> 
> http://docs.python.org/tutorial/datastructures.html#nested-list-
comprehensions
> 
> 
> "If you?ve got the stomach for it, list comprehensions can be nested.
> They are a powerful tool but ? like all powerful tools ? they need to be
> used carefully, if at all."

How does this discourage the use of list comprehensions? At most, it 
warns that complicated list comps are tricky. Complicated *anything* are 
tricky.


> and
> 
> "In real world, you should prefer builtin functions to complex flow
> statements."

That's ridiculous. The example given is a special case. That's like 
saying "Loops are hard, so in the real world, if you want a loop, find a 
builtin function that does what you want instead."

What's the "builtin function" we're supposed to prefer over a "complex 
flow statement" like this?

# split text into word fragments of length <= 3
sentence = "a sentence is a series of words"
new = [word[i:i+3] for word in sentence.split() for i in range(0, len(word), 3)]



-- 
Steven


From legoandrew at schjelderup.org  Wed May  6 21:39:01 2009
From: legoandrew at schjelderup.org (Andrew Free)
Date: Wed, 6 May 2009 18:39:01 -0700
Subject: Tkinter Caesar Cipher GUI (speed errors?)
Message-ID: <3F213EA7-F667-4BAA-93EA-6D7205188FCB@schjelderup.org>

I have been told the mailing lists talk a lot about Tkinter and I have  
not been able to find anyone who knows the answer to this question.  
This is also the first time I have used the mailing lists, so hey  
guys :D.

I decided to work on a GUI for this because I need the practice.  
However I ran into this weird problem.
If I change line 67 from 1000 to 100 my program prints two of the last  
letter...http://pastebin.com/d656cfd09
(with 1000) http://www.grabup.com/uploads/9d477c68231951f4025a27090de798e1.png?direct
with (100) http://www.grabup.com/uploads/8adfdc83e9b5a2e9e7af1f557a97a3ee.png?direct

That just makes no sense at all. Is 100 to fast for it to run? I would  
think it would wait for it to finish and update the GUI before it  
moved on.

Thanks,

Andrew
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From lists at cheimes.de  Wed May  6 21:40:16 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 07 May 2009 03:40:16 +0200
Subject: Python 2.6 worth the hassle?
In-Reply-To: <pan.2009.05.07.01.34.17@REMOVE.THIS.cybersource.com.au>
References: <mailman.5174.1241648774.11746.python-list@python.org>
	<pan.2009.05.07.01.34.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <gtte60$sln$1@ger.gmane.org>

Steven D'Aprano wrote:
> Are you saying that Intrepid uses Python3.0 as it's default Python?
> 
> If not, then just use the default Python installed. Possibly Python 2.5. 
> The differences between 2.5 and 2.6 are minor.

Ubuntu 9.04 has Python 2.6.2 as default Python interpreter. It's also
shipped with Python 2.5. Python 2.4 and 3.0 are in its software list, too.

Christian



From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 21:48:28 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 01:48:28 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
	<op.uti1kf0ga8ncjz@gnudebst> <1241649200.4a0210301f77e@mail.uh.cu>
	<mailman.5189.1241657949.11746.python-list@python.org>
Message-ID: <pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>

On Thu, 07 May 2009 01:59:02 +0100, Rhodri James wrote:

> On Wed, 06 May 2009 23:33:20 +0100, Luis Alberto Zarrabeitia Gomez
> <kyrie at uh.cu> wrote:
> 
>> Quoting Rhodri James <rhodri at wildebst.demon.co.uk>:
>>> So the answer to my question would be "nothing"?
>>
>> Indeed, there is nothing broken with the search and replace feature of
>> his editor. When he is copying a non-recursive function, it is
>> _useless_ to do a search and replace. When he is copying a recursive
>> function, it is _required_ to do a search and replace.
> 
> On the contrary, it's merely not very useful for a non-recursive
> function.
[...]


Whether search and replace is "not very useful" or "not useful at all", 
it's still an inconvenience and a PITA. Calling up S&R to search through 
a six line function is ridiculously overkill, but if you don't do it, 
you'll surely be bitten.

But regardless, everyone is missing the most important point: why are you 
copying and pasting code in the first place? That is surely very close to 
the top of the list of Worst Ever Anti-Patterns, and it should be avoided 
whenever possible.

In Python, we can avoid much copy-and-paste coding with decorators. Given 
one function, we can create as many variants as we want, differing in pre-
processing of arguments and post-processing of results, by using 
decorators. This is a powerful ability to have, but it's crippled for 
many recursive functions, because recursive functions in Python don't 
actually call themselves, they call whatever happens to be bound to their 
name at runtime.

As Luis said, all(?) programming languages have this same weakness. Just 
because it's a weakness shared by all languages, doesn't stop it from 
being a weakness. My proposal will lesson (but not entirely eliminate) 
this weakness.



-- 
Steven


From Shawn at Milochik.com  Wed May  6 21:51:47 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 6 May 2009 21:51:47 -0400
Subject: Copy & Paste in a Dos box
In-Reply-To: <6640b734-80a7-4292-8223-7c00f5538261@r3g2000vbp.googlegroups.com>
References: <4A01AD6E.4010807@umbc.edu> <4A01CD29.3010507@hughes.net>
	<mailman.5154.1241632462.11746.python-list@python.org>
	<a37427bb-f904-4a5d-b464-88ff07367b9d@z5g2000vba.googlegroups.com>
	<mailman.5167.1241642789.11746.python-list@python.org>
	<82feff6c-e238-4a08-b4e5-d88c14157211@g19g2000vbi.googlegroups.com>
	<mailman.5182.1241651712.11746.python-list@python.org>
	<6640b734-80a7-4292-8223-7c00f5538261@r3g2000vbp.googlegroups.com>
Message-ID: <2dc0c81b0905061851xbfb5ac3q403c51adbe510c46@mail.gmail.com>

<snip>
> Damn! I may just go back to using Python from the command prompt
> instead of using IDLE.
>
> On second thought, IDLE is way too useful for indenting, dedenting,
> commenting and uncommenting blocks of code. Can't go back to using
> Notepad.
>
<snip>


You might want to check out iPython, then -- it's an interactive
Python interpreter that's meant to be used as a shell environment. It
has very useful help and auto-completion features.

If you're just talking about an IDE, you might want to try TextMate if
you're on a Mac. It's great. Notepad++ is good on Windows, but I
haven't used it in Python much, so I don't know about its indentation
features.


From kyrie at uh.cu  Wed May  6 22:32:23 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Wed, 06 May 2009 22:32:23 -0400
Subject: Self function
In-Reply-To: <pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
	<op.uti1kf0ga8ncjz@gnudebst> <1241649200.4a0210301f77e@mail.uh.cu>
	<mailman.5189.1241657949.11746.python-list@python.org>
	<pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>
Message-ID: <1241663543.4a024837a9680@mail.uh.cu>


Quoting Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>:

> But regardless, everyone is missing the most important point: why are you 
> copying and pasting code in the first place? That is surely very close to 
> the top of the list of Worst Ever Anti-Patterns, and it should be avoided 
> whenever possible.

[btw, I took this long before jumping into this thread for this precise
reason... Copy/paste is an evil anti-pattern.

> In Python, we can avoid much copy-and-paste coding with decorators. Given 
> one function, we can create as many variants as we want, differing in pre-
> processing of arguments and post-processing of results, by using 
> decorators. This is a powerful ability to have, but it's crippled for 
> many recursive functions, because recursive functions in Python don't 
> actually call themselves, they call whatever happens to be bound to their 
> name at runtime.

A bit offtopic: a while ago I think I saw a recipe for a decorator that, via
bytecode hacks, would bind otherwise global names to the local namespace of the
function. Can anyone remember it/point me to it? An @bind decorator that would
'localize' all the global names, including the still unexistent but already know
function name, would guarantee that at least recursion calls the same function
instead of "whatever happens to be bound to their name at runtime". If it wasn't
a hack, anyway.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie


-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From georgeoliverGO at gmail.com  Wed May  6 22:38:41 2009
From: georgeoliverGO at gmail.com (George Oliver)
Date: Wed, 6 May 2009 19:38:41 -0700 (PDT)
Subject: call function of class instance with no assigned name?
References: <447f2963-07b1-40bb-b084-ddf6c9cc880b@c18g2000prh.googlegroups.com>
	<mailman.5117.1241549976.11746.python-list@python.org>
	<ccd2123a-b09e-43e0-a6a0-b052442267ff@d25g2000prn.googlegroups.com>
	<42c18697-15ab-4813-8267-c416fae38642@p4g2000vba.googlegroups.com>
Message-ID: <bcb21279-e084-423a-98b3-3dc5bc0c2c8f@k9g2000pra.googlegroups.com>

On May 6, 3:07 pm, Carl Banks <pavlovevide... at gmail.com> wrote:

> I'm going to guess that you want the keyboardHandler to call method of
> commandHandler.  There's no reason for commandHandler to be a handler
> at all then: keyboardHandler is already handling it.


Thanks Carl, you've got it right and your following example is what I
ended up using, it's good to know it's a workable solution.


From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 22:41:29 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 02:41:29 GMT
Subject: Simple way of handling errors
References: <2009050616401916807-tomfsessile@gmailcom>
Message-ID: <pan.2009.05.07.02.41.28@REMOVE.THIS.cybersource.com.au>

On Wed, 06 May 2009 16:40:19 -0700, TomF wrote:

> As a relative newcomer to Python, I like it a lot but I'm dismayed at
> the difficulty of handling simple errors.  In Perl if you want to
> anticipate a file-not-found error you can simply do:
> 
> open($file)  or die("open($file): $!");
> 
> and you get an intelligible error message.  In Python, to get the same
> thing it appears you need at least:
> 
> try:
>     f=open(file)
> except IOError, err:
>     print "open(%s): got %s" % (file, err.strerror)
>     exit(-1)


Functions never fail silently in Python. (At least built-in functions 
never fail silently. Functions you write yourself can do anything you 
want.)


The canonical way of doing "open or die" in Python is to just call open:

f = open(filename)

If it fails, you get both a straight-forward error message and a useful 
traceback:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: [Errno 2] No such file or directory: 'foomanchu'

 
The only reason you would bother going to the time and effort of catching 
the error, printing your own error message, and then exiting, is if you 
explicitly want to hide the traceback from the user.

Oh, and if you do that, I recommend that you print to stderr instead of 
stdout:

    print >>sys.stderr, "open(%s): got %s" % (file, err.strerror)

or 

    sys.stderr.write("open(%s): got %s\n" % (file, err.strerror))



-- 
Steven


From jianchun.zhou at gmail.com  Wed May  6 22:49:33 2009
From: jianchun.zhou at gmail.com (Jianchun Zhou)
Date: Thu, 7 May 2009 10:49:33 +0800
Subject: Why there is a parameter named "self" for classmethod function?
Message-ID: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>

Hi, ALL:

I have a sample code as bellow:

#!/usr/bin/env python

class Hello:
    def __init__(self):
        print "Hello __init__"
    @classmethod
    def print_hello(self):
        print "hello"

Hello.print_hello()

If I move "self" parameter of print_hello away, this code fragment won't
work.

I am wondering when Hello.print_hello() executes, what value will "self" be
asigned?


-- 
Best Regards
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From clp2 at rebertia.com  Wed May  6 22:55:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 6 May 2009 19:55:57 -0700
Subject: Why there is a parameter named "self" for classmethod function?
In-Reply-To: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
Message-ID: <50697b2c0905061955s7bd16296lca71f98039e8f292@mail.gmail.com>

On Wed, May 6, 2009 at 7:49 PM, Jianchun Zhou <jianchun.zhou at gmail.com> wrote:
> Hi, ALL:
>
> I have a sample code as bellow:
>
> #!/usr/bin/env python
>
> class Hello:
> ??? def __init__(self):
> ??????? print "Hello __init__"
> ??? @classmethod
> ??? def print_hello(self):
> ??????? print "hello"
>
> Hello.print_hello()
>
> If I move "self" parameter of print_hello away, this code fragment won't
> work.
>
> I am wondering when Hello.print_hello() executes, what value will "self" be
> asigned?

The class itself will be the value of self (hence the "class" in
"classmethod") in that case. For this reason, the parameter is
conventionally called "cls" rather than "self", to avoid confusion.

Cheers,
Chris
-- 
http://blog.rebertia.com


From kurt at kbsymanzik.org  Wed May  6 23:01:44 2009
From: kurt at kbsymanzik.org (Kurt Symanzik)
Date: Thu, 07 May 2009 11:01:44 +0800
Subject: Why there is a parameter named "self" for classmethod function?
In-Reply-To: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
Message-ID: <4A024F18.9080407@kbsymanzik.org>

Jianchun Zhou <jianchun.zhou at gmail.com> wrote on 2009-05-07 10:49:33 AM 
+0800
> I have a sample code as bellow:
> 
> #!/usr/bin/env python
> 
> class Hello:
>     def __init__(self):
>         print "Hello __init__"
>     @classmethod
>     def print_hello(self):
>         print "hello"
> 
> Hello.print_hello()
> 
> If I move "self" parameter of print_hello away, this code fragment won't 
> work.
> 
> I am wondering when Hello.print_hello() executes, what value will "self" 
> be asigned?

The self variable above with be populated with a reference to the class, 
so it would be more appropriately named cls such as:

@classmethod
def print_hello(cls):
	print "hello"

But you might consider decorating the method as a static method instead 
since in your example you are not using the parameter at all.  A static 
method would not require a parameter.

@staticmethod
def print_hello():
	print "hello"

Kurt

-- 
Kurt Symanzik
kurt at kbsymanzik.org
Skype id: ksymanzik
http://kbsymanzik.org


From sjmachin at lexicon.net  Wed May  6 23:11:17 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 6 May 2009 20:11:17 -0700 (PDT)
Subject: Could this expression parser be more 'Pythonic'?
References: <e8f3a550-647b-4ce2-bae3-c160e42e5439@j12g2000vbl.googlegroups.com>
Message-ID: <b8f53ce0-1bd5-4eb9-a7dd-d9df2b8b5ed9@d19g2000prh.googlegroups.com>

On May 7, 9:23?am, Amr <amrbek... at gmail.com> wrote:
> Hello all,
>
> I've been spending the last few weeks learning Python, and I've just
> started to use it to write a simple BASIC compiler. I'm writing a
> mathematical expression parser and wrote a function that would take a
> string and split it into high level tokens.
>
> The code can be found athttp://pastebin.com/f757252ec(have a look at
> the function tokenize).

It's always a good idea to describe to yourself what you are actually
trying to achieve before you get too embrolied in the implementation
details.

Adding a few more tests like this:

if __name__ == '__main__':
    tests = """\
    1 + 2 * 3
    (1 + 2) * 3
    1 + (2 * 3)
    !@#$%^
    foo = bar + zot
    foo=bar+zot
    xyzzy(bar, zot + 2.34)
    """
    for test in tests.splitlines():
        test = test.strip()
        e = Expression(test)
        result = e.tokenize(e.expression)
        print "%r => %r" % (test, result)

produces this:
'1 + 2 * 3' => ['1', '+', '2', '*', '3']
'(1 + 2) * 3' => ['1 + 2', '*', '3']
'1 + (2 * 3)' => ['1', '+', '2 * 3']
'!@#$%^' => ['!@#$%^']
'foo = bar + zot' => ['foo', '=', 'bar', '+', 'zot']
'foo=bar+zot' => ['foo=bar', '+', 'zot']
'xyzzy(bar, zot + 2.34)' => ['xyzzy', 'bar, zot + 2.34']
'' => []

which indicates that your notions of what a token is and what you
might use them for must be rather "interesting".

Most other folks' tokenisers would have no concept of "bracket depth",
would not throw the parentheses away, and would return not only the
tokens but a classification as well e.g.

'xyzzy' ID
'(' LPAREN
'bar' ID
',' LISTSEP
'zot' ID
'+' OPER
'2.34' FLOAT_CONST
')' RPAREN


> I was interested to see if the tokenize function could be written in a
> better way, so as to make better use of the Python language and
> libraries. One thing that sprung to mind was whether it would be a
> good idea to perhaps take advantage of regular expressions. I had a
> look at a few compiler sites and regexps seem to come into that role
> quite a bit. I've only done a little work on regexps and they seem
> very powerful, but can easily get out of control!
>
> So, any suggestions as to how to make better use of the language
> writing something like this?

There are various packages like pyparsing, plex, ply, ... which are
all worth looking at. However if you want to get stuck into the
details, you can lash up a quick and dirty lexer (tokeniser) using
regexps in no time flat, e.g.

an ID is matched by r"[A-Za-z_][A-Za-z0-9_]*"
an INT_CONST is matched by r"[0-9]+"
an OPER is matched by r"[-+/*]"
etc
so you set up a (longish) re containing all the alternatives
surrounded by capturing parentheses and separated by "|".

r"([A-Za-z_][A-Za-z0-9_]*)|([0-9]+)|([-+/*])etc"

Hint: don't do it manually, use ")|(".join()

and you just step through your input string:
1. skip over any leading whitespace
2. look for a match of your re starting at current offset
3. matchobj.lastindex gives you 0 if it's an ID, 1 if it's an
INT_CONST, etc
4. save the slice that represents the token
5. adjust offset, loop around until you hit the end of the input

Hint: the order in which you list the alternatives can matter a lot
e.g. you better have "<=" before "<" otherwise it would regard "<=" as
comprising two tokens "<" and "="

HTH,
John


From apt.shansen at gmail.com  Wed May  6 23:19:56 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Wed, 6 May 2009 20:19:56 -0700
Subject: Simple way of handling errors
In-Reply-To: <pan.2009.05.07.02.41.28@REMOVE.THIS.cybersource.com.au>
References: <2009050616401916807-tomfsessile@gmailcom>
	<pan.2009.05.07.02.41.28@REMOVE.THIS.cybersource.com.au>
Message-ID: <7a9c25c20905062019m2d428612i1f23f221bf8b898@mail.gmail.com>

> If it fails, you get both a straight-forward error message and a useful
> traceback:
>
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> IOError: [Errno 2] No such file or directory: 'foomanchu'
>
>
> The only reason you would bother going to the time and effort of catching
> the error, printing your own error message, and then exiting, is if you
> explicitly want to hide the traceback from the user.
>

Unfortunately, I find that even halfway technically trained
(not necessarily naturally inclined or talented, but trained) users are
utterly unable to read tracebacks in real world situations. I had to put up
a rather big guide on how to read and interpret even the simplest ones
complete with color coding, "how to pick out a traceback visually", "what
line to focus your attention on (the last)", and "how trying to /read/ it
instead of immediately sending it to me as if it were an opaque symbol
containing secret knowledge only I can make sense of, generally saves you
time in debugging issues". I'm not talking about esoteric tracebacks either
resulting from real bugs and stuff. I'm talking about 'file not found'
'permission denied' IO/OS level ones that should give serious hints at
things people should check/diagnose themselves.

There's a serious, "oh my god, traceback, /eyes glazed over/" reaction all
around. Now these aren't unix people or command line people (except my
rote), but still.

I don't quite find printing out tracebacks to stdout or stderr ever
acceptable :( Especially if its an expected error condition (file not found
is a very good example of that).

I route all my tracebacks into log files for diagnosing later (people also
can not be relied upon to say anything but 'traceback' when they see one: so
storing it for later is vital. They read the first word and stop. The
thought of most-significant-information at the bottom is a difficult thing,
alas)

Anyways. ;-) That's just my experience.

As to the OP: try/except is how you do it in Python. There's no shorter or
easier way; exceptions are how Python handles failure-states (even
soft/expected errors quite often) and it does so pervasively (but not
universally).

--S
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From tomf.sessile at gmail.com  Wed May  6 23:21:38 2009
From: tomf.sessile at gmail.com (TomF)
Date: Wed, 6 May 2009 20:21:38 -0700
Subject: Simple way of handling errors
References: <2009050616401916807-tomfsessile@gmailcom>
	<pan.2009.05.07.02.41.28@REMOVE.THIS.cybersource.com.au>
Message-ID: <2009050620213875249-tomfsessile@gmailcom>

On 2009-05-06 19:41:29 -0700, Steven D'Aprano 
<steven at REMOVE.THIS.cybersource.com.au> said:

> On Wed, 06 May 2009 16:40:19 -0700, TomF wrote:
> 
>> As a relative newcomer to Python, I like it a lot but I'm dismayed at
>> the difficulty of handling simple errors.  In Perl if you want to
>> anticipate a file-not-found error you can simply do:
>> 
>> open($file)  or die("open($file): $!");
>> 
>> and you get an intelligible error message.  In Python, to get the same
>> thing it appears you need at least:
>> 
>> try:
>> f=open(file)
>> except IOError, err:
>> print "open(%s): got %s" % (file, err.strerror)
>> exit(-1)
> 
> 
> Functions never fail silently in Python. (At least built-in functions
> never fail silently. Functions you write yourself can do anything you
> want.)

Well, yes, I'm aware that if you don't handle errors Python barfs out a 
backtrace.

> If it fails, you get both a straight-forward error message and a useful
> traceback:
> 
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> IOError: [Errno 2] No such file or directory: 'foomanchu'
> 
> The only reason you would bother going to the time and effort of catching
> the error, printing your own error message, and then exiting, is if you
> explicitly want to hide the traceback from the user.

Well, to me, exposing the user to such raw backtraces is 
unprofessional, which is why I try to catch user-caused errors.  But I 
suppose I have an answer to my question.

Thanks,
-Tom



From steven at REMOVE.THIS.cybersource.com.au  Wed May  6 23:38:22 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 03:38:22 GMT
Subject: Simple way of handling errors
References: <2009050616401916807-tomfsessile@gmailcom>
	<pan.2009.05.07.02.41.28@REMOVE.THIS.cybersource.com.au>
	<2009050620213875249-tomfsessile@gmailcom>
Message-ID: <pan.2009.05.07.03.38.21@REMOVE.THIS.cybersource.com.au>

On Wed, 06 May 2009 20:21:38 -0700, TomF wrote:

>> The only reason you would bother going to the time and effort of
>> catching the error, printing your own error message, and then exiting,
>> is if you explicitly want to hide the traceback from the user.
> 
> Well, to me, exposing the user to such raw backtraces is unprofessional,
> which is why I try to catch user-caused errors.  But I suppose I have an
> answer to my question.

That depends on your audience. Not every program is written to be used 
for a technical incompetent audience. Some users actually *want* to see 
the errors.

But certainly there are large classes of applications where you do want 
to suppress the traceback. That's why I said "if you explicitly want to 
hide the traceback from the user" rather than "don't do this".

The idiom I use is to wrap the *entire* application in a single 
try...except block, and then put all your user-friendly error handling in 
one place, instead of scattered over the entire application:


try:
    main(sys.argv[1:])
except KeyboardInterrupt, SystemExit:
    raise
except Exception, e:
    log(e)
    print >>sys.stderr, str(e)
    sys.exit(1)



Hope this helps.



-- 
Steven



From smiles at worksmail.net  Wed May  6 23:43:49 2009
From: smiles at worksmail.net (C or L Smith)
Date: Thu, 7 May 2009 09:28:49 +0545
Subject: Parsing text
Message-ID: <48E1A76D33C74BF888B381EB5E1F4E14@kisc.edu.np>

> Hi,
> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.
> 
> for scene in text.split('Scene'):
>     num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)
>     textNum = num.match(scene)
>     if textNum:
>         print textNum
>     else:
>         print "No scene number"
>     m = '<div type="scene>'
>     m += scene
>     m += '<\div>'
>     print m
> 
> Thanks, Iain
> 

Don't forget that when you split the text, the first piece you get is what came *before* the thing you split on so there won't be a scene number in the first piece.

###
>>> print 'this foo 1 and that foo 2 and the end'.split('foo')
['this ', ' 1 and that ', ' 2 and the end']
###

If you have material before the first occurrence of the word 'Scene' you will want to print that out without decoration.

Also, it looks like you are trying to say with your regex that the scene number will come after some space and be a digit followed by a roman numeral of some kind(?). If the number looks like this 1iii or 2iv or then you could split your text with a regex rather than split:

###
>>> scene=re.compile('Scene\s+([0-9iIvV]+)')
>>> scene.split('The front matter Scene 1i The beginning was the best. Scene  1ii And then came the next act.')
['The front matter ', '1i', ' The beginning was the best. ', '1ii', ' And then came the next act.']
>>> 
###

The \s+ indicates that there will be at least one space character and maybe more; the human error factor predicts that you will use more than one space after the word scene, so \s+ just allows for that possibility.

The 0-9iIvV indicate the possible characters that might be part of your scene number. Since it's unlikely that you will have any word appearing after Scene that matches that pattern, it isn't written to be exact in specifying what should come next. [1] The parenthesis tell what (beside the pieces left by removing the split target) should be presented. In this case, the parenthesis were put around the pattern that (maybe) represented your scene number and so those are interspersed with the list of pieces.

/chris

[1] If it were more precise it might be '([1-9][0-9]*(iv|v?i{0,3}))' which recognizes that a number should start with 1 or above and perhaps be followed by 0 or more digits (including 0) and then come the roman numeral possibilities (for up to viii) [2].  That "|" indicates "or" and the parenthesis go around the roman numeral part to indicate that the "or" doesn't extend back to the decimal digits. That extra set of parenthesis also means that the split will now contain TWO captured pieces between each piece of script. If you put a ? after the scene number part meaning that it may or may not be there, None will be returned for the patterns that are not there:

###
>>> scene=re.compile('Scene\s+([1-9][0-9]*(iv|v?i{0,3}))?')
>>> scene.split('The front matter Scene 1i The beginning was the best. Scene  1ii And then came the next act. Scene The last one has no number.')
['The front matter ', '1i', 'i', ' The beginning was the best. ', '1ii', 'ii', ' And then came the next act. ', None, None, 'The last one has no number.']
>>> 
###

[2] http://diveintopython.org/regular_expressions/roman_numerals.html


From pierregmcode at gmail.com  Wed May  6 23:51:35 2009
From: pierregmcode at gmail.com (Pierre GM)
Date: Wed, 6 May 2009 20:51:35 -0700 (PDT)
Subject: Logging exceptions to a file
Message-ID: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>

All,
I need to log messages to both the console and a given file. I use the
following code (on Python 2.5)

>>> import logging
>>> #
>>> logging.basicConfig(level=logging.DEBUG,)
>>> logfile = logging.FileHandler('log.log')
>>> logfile.setLevel(level=logging.INFO)
>>> logging.getLogger('').addHandler(logfile)
>>> #
>>> mylogger = logging.getLogger('mylogger')
>>> #
>>> mylogger.info("an info message")

So far so good, but I'd like to record (possibly unhandled) exceptions
in the logfile.
* Do I need to explicitly trap every single exception ?
* In that case, won't I get 2 log messages on the console (as
illustrated in the code below:
>>> try:
>>>     1/0
>>> except ZeroDivisionError:
>>>     mylogger.exception(":(")
>>>     raise

Any comments/idea welcomed
Cheers.



From ross.jett at gmail.com  Thu May  7 00:02:47 2009
From: ross.jett at gmail.com (Ross)
Date: Wed, 6 May 2009 21:02:47 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>
Message-ID: <51631d39-ad19-4081-8e71-787cd565f252@s20g2000vbp.googlegroups.com>

On May 6, 3:14?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 6, 3:29?am, MRAB <goo... at mrabarnett.plus.com> wrote:
>
> > I have the feeling that if the number of rounds is restricted then the
> > difference between the minimum and maximum number of byes could be 2
> > because of the requirement that players shouldn't play each other more
> > than once, meaning that the players have to be shuffled around a bit, so
> > a player might play a week earlier or later than would otherwise be the
> > case.
>
> This is the feeling that I am getting also. ?All my efforts to keep
> everything as balanced as possible at all times (to be ready for the
> "season" to end suddenly at any time) result in messy jams that could
> otherwise be alleviated if I allowed temporary imbalances, knowing
> that there are more weeks later to make them up.
>
> John

If I were to set up a dictionary that counted players used in the bye
list and only allowed players to be added to the bye list if they were
within 2 of the least used player, would this be a good approach for
managing bye selection or would using a dictionary in this manner be
unnecessary/redundant?


From ross.jett at gmail.com  Thu May  7 00:30:12 2009
From: ross.jett at gmail.com (Ross)
Date: Wed, 6 May 2009 21:30:12 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>
Message-ID: <1e781afa-598d-41e6-941f-76b7f8ca2a32@21g2000vbk.googlegroups.com>

On May 6, 3:14?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 6, 3:29?am, MRAB <goo... at mrabarnett.plus.com> wrote:
>
> > I have the feeling that if the number of rounds is restricted then the
> > difference between the minimum and maximum number of byes could be 2
> > because of the requirement that players shouldn't play each other more
> > than once, meaning that the players have to be shuffled around a bit, so
> > a player might play a week earlier or later than would otherwise be the
> > case.
>
> This is the feeling that I am getting also. ?All my efforts to keep
> everything as balanced as possible at all times (to be ready for the
> "season" to end suddenly at any time) result in messy jams that could
> otherwise be alleviated if I allowed temporary imbalances, knowing
> that there are more weeks later to make them up.
>
> John

If I were to set up a dictionary that counted players used in the bye
list and only allowed players to be added to the bye list if they were
within 2 of the least used player, would this be a good approach for
managing bye selection or would using a dictionary in this manner be
unnecessary/redundant?


From ross.jett at gmail.com  Thu May  7 00:30:26 2009
From: ross.jett at gmail.com (Ross)
Date: Wed, 6 May 2009 21:30:26 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com> 
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>
Message-ID: <1d8802ff-8211-467f-95c1-4616e3bd7300@s20g2000vbp.googlegroups.com>

On May 6, 3:14?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 6, 3:29?am, MRAB <goo... at mrabarnett.plus.com> wrote:
>
> > I have the feeling that if the number of rounds is restricted then the
> > difference between the minimum and maximum number of byes could be 2
> > because of the requirement that players shouldn't play each other more
> > than once, meaning that the players have to be shuffled around a bit, so
> > a player might play a week earlier or later than would otherwise be the
> > case.
>
> This is the feeling that I am getting also. ?All my efforts to keep
> everything as balanced as possible at all times (to be ready for the
> "season" to end suddenly at any time) result in messy jams that could
> otherwise be alleviated if I allowed temporary imbalances, knowing
> that there are more weeks later to make them up.
>
> John

If I were to set up a dictionary that counted players used in the bye
list and only allowed players to be added to the bye list if they were
within 2 of the least used player, would this be a good approach for
managing bye selection or would using a dictionary in this manner be
unnecessary/redundant?


From tjreedy at udel.edu  Thu May  7 00:33:26 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 00:33:26 -0400
Subject: Self function
In-Reply-To: <pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>	<m2iqkhnzxy.fsf@googlemail.com>	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>	<mailman.5072.1241474108.11746.python-list@python.org>	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>	<op.uthious2a8ncjz@gnudebst>	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>	<op.uti1kf0ga8ncjz@gnudebst>
	<1241649200.4a0210301f77e@mail.uh.cu>	<mailman.5189.1241657949.11746.python-list@python.org>
	<pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>
Message-ID: <gttoan$fm4$1@ger.gmane.org>

Steven D'Aprano wrote:

I am writing a book (with Python package) on algorithms that has *lots* 
of recursive functions.  I have also discovered that changing names can 
be a pain.  So in the text, (but not code) I have tried the equivalent of

# real_name
def f(params):
   ... f(args)

(This also keeps lines short enough for side-by-side versions, when I 
want to do that.)

> But regardless, everyone is missing the most important point: why are you 
> copying and pasting code in the first place?

In my case, I will be discussing variations of algorithms.  Copy and 
edit minimizes fatigue and errors and maximizes parallelism.

  That is surely very close to
> the top of the list of Worst Ever Anti-Patterns, and it should be avoided 
> whenever possible.

Not if the alternative is re-typing ;-).

> In Python, we can avoid much copy-and-paste coding with decorators.

But not when the variation is in the guts of the code.

 > because recursive functions in Python don't actually call themselves, 
 > they call whatever happens to be bound to their name at runtime.

I have mentioned that.  Also, apparently non-recursive functions can 
become recursive after the fact by being bound to another name used in 
the function.

tjr



From tjreedy at udel.edu  Thu May  7 00:39:28 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 00:39:28 -0400
Subject: Why there is a parameter named "self" for classmethod function?
In-Reply-To: <4A024F18.9080407@kbsymanzik.org>
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
	<4A024F18.9080407@kbsymanzik.org>
Message-ID: <gttom1$gbf$1@ger.gmane.org>

Kurt Symanzik wrote:

> 
> But you might consider decorating the method as a static method instead 
> since in your example you are not using the parameter at all.  A static 
> method would not require a parameter.
> 
> @staticmethod
> def print_hello():
>     print "hello"

Functions that refer to neither the class nor an instance thereof can 
usually be moved outside the class altogether.  Python is not Java.  I 
believe staticmethod() was mainly added because it is needed for 
.__new__(), at least in some appearances.

tjr



From gallium.arsenide at gmail.com  Thu May  7 01:11:04 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Wed, 6 May 2009 22:11:04 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com> 
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>
	<1d8802ff-8211-467f-95c1-4616e3bd7300@s20g2000vbp.googlegroups.com>
Message-ID: <b2cf45ed-d3da-4d93-883c-c8985d40ad55@r34g2000vba.googlegroups.com>

On May 7, 12:30?am, Ross <ross.j... at gmail.com> wrote:
>
> If I were to set up a dictionary that counted players used in the bye
> list and only allowed players to be added to the bye list if they were
> within 2 of the least used player, would this be a good approach for
> managing bye selection or would using a dictionary in this manner be
> unnecessary/redundant?

I certainly have not proved it, but I think you don't need to resort
to anything fancy if you are OK with the maximum byes being within two
of the minimum byes.  (Maybe this needs to be larger with larger
numbers of players.)  Try using your original shuffle but instead of
selecting matches to "throw away" each week, just use the matches you
need (to fill up the courts) and pick up where you left off the next
week.  For example, with 10 players, each "round" ideally consists of
five matches.  If you only have four courts, don't throw away the
fifth match; save it as the first match next week.

To be honest, I didn't look too carefully at your original shuffle.
It may be good enough.  It's a little different than the "standard"
rotation as presented on Wikipedia:

  http://en.wikipedia.org/wiki/Round-robin_tournament#Scheduling_algorithm

The one on Wikipedia happened to pass my casual tests with no more
than a 2-bye difference between the most-played and least-played
players, and didn't run into the problem of scheduling the same player
for two matches the same week.  But I have to stress I only tried a
few starting values, which all worked; I didn't try to break it, or
run an extensive battery of tests.

John


From ganesh.gbg at gmail.com  Thu May  7 01:17:17 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Wed, 6 May 2009 22:17:17 -0700 (PDT)
Subject: problem in using sendmail in multi thread
References: <mailman.5150.1241619049.11746.python-list@python.org>
Message-ID: <8254344f-a31e-489a-9adc-7f0eee9915e2@g31g2000pra.googlegroups.com>

On May 6, 7:10?pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
> On Tue, 5 May 2009 22:17:35 -0700 (PDT), gganesh <ganesh.... at gmail.com> wrote:
> >On May 5, 9:25?pm, Piet van Oostrum <p... at cs.uu.nl> wrote:
> >> >>>>> gganesh <ganesh.... at gmail.com> (g) wrote:
> >> >g> hi,
> >> >g> I'm a beginner in using Python script
> >> >g> I'm trying to send mails using multi-thread
> >> >g> I wrote
> >> >g> FROM = 'ganeshx... at xxxx.com'
> >> >g> # for more mail add';' the another mail id
> >> >g> listTo = ['g.... at gmail.com', 'xxjango... at gmail.com',
> >> >g> 'xx... at yahoo.co.in']
> >> >g> SUBJECT = 'This is the subject'
> >> >g> MSGBODY = 'This the body of the message '
> >> >g> MAILSERVER = 'mail.xxxx.com'
> >> >g> port = 25
> >> >g> username = 'xxxxx'
> >> >g> password = 'xxxxx'
> >> >g> # trim the strings of any leading or trailing spaces
> >> >g> FROM = FROM.strip()
> >> >g> SUBJECT = SUBJECT.strip()
> >> >g> MSGBODY = MSGBODY.strip()
> >> >g> MAILSERVER = MAILSERVER.strip()
> >> >g> username = username.strip()
> >> >g> password = password.strip()
> >> >g> #Connect to server
> >> >g> print 'Connecting to mail server ', MAILSERVER
> >> >g> try:
> >> >g> ? ? ? s = smtplib.SMTP(MAILSERVER,port)
>
> >> You can't have a single SMTP connection that's used in multiple threads.
> >> That is what causes the error. Each thread should have its own SMTP
> >> connection. So move this code (above and below) into the run() method.
>
> >> >g> ? ? ? print 'connected'
> >> >g> #s.set_debuglevel(1)
> >> >g> except:
> >> >g> ? ? ? ?print 'ERROR: Unable to connect to mail server', sys.exc_info ?()[0]
> >> >g> ? ? ? ?sys.exit(1)
> >> >g> #login to server
> >> >g> if password <> '':
> >> >g> ? ? ? print 'Logging into mail server'
>
> >> I think this try except block should be inside the if statement, i.e.
> >> indented 4 spaces.
>
> >> >g> try:
> >> >g> ? ? ? s.login(username,password)
> >> >g> except:
> >> >g> ? ? ? print 'ERROR: Unable to login to mail server', MAILSERVER
> >> >g> ? ? ? print 'Please recheck your password'
> >> >g> ? ? ? sys.exit(1)
> >> >g> #--------------------------------------------------
> >> >g> print "Starting Multi Thread Method"
> >> >g> class MyThread(Thread):
> >> >g> ? ? def __init__(self, site, s, FROM, MSGBODY):
> >> >g> ? ? ? ? Thread.__init__(self)
> >> >g> ? ? ? ? self.site = site
> >> >g> ? ? ? self.s=s
> >> >g> ? ? ? self.FROM=FROM
> >> >g> ? ? ? self.MSGBODY=MSGBODY
>
> >> You give the s (connection) here as a parameter, store it in self.s and
> >> never use that attribute.
>
> >> >g> ? ? def run(self):
> >> >g> ? ? ? print "running for %s " %self.site
> >> >g> ? ? ? s.sendmail(self.FROM, self.site, self.MSGBODY)
>
> >> Here you use the global s, not self.s
>
> >> As I said above you should do the SMTP connection setup, including the
> >> login, here, and store the connection either in self.s or in a local
> >> variable s in the method. As you don't use the s in another method, I
> >> think a local variable is better.
>
> >> >g> ? ? ? print "Emailed for ?site %s" %self.site
> >> >g> a= time.time()
> >> >g> threads = []
> >> >g> for site in listTo:
> >> >g> ? ? T = MyThread(site,s,FROM,MSGBODY)
> >> >g> ? ? threads.append(T)
> >> >g> ? ? T.start()
> >> >g> for i in threads:
> >> >g> ? ? i.join()
>
> >> Of course the next 2 lines should also be moved to run().
>
> >> >g> s.quit()
> >> >g> s.close()
> >> >g> print "Took %s seconds" %str(time.time()-a)
> >> >g> #-----------------------------------------------------
>
> >> --
> >> Piet van Oostrum <p... at cs.uu.nl>
> >> URL:http://pietvanoostrum.com[PGP8DAE142BE17999C4]
> >> Private email: p... at vanoostrum.org
>
> >Thanks Everyone By your guidance the code worked fine
> >I can send mails in multi threaded environment.
> >Is this only way to send mails concurrently ?or any other method
> >aviable?
>
> Here's another way:
>
> ? ? from twisted.mail.smtp import sendmail
> ? ? from twisted.internet import reactor
> ? ? from twisted.python.log import err
>
> ? ? MAILSERVER = ...
> ? ? listTo = [...]
> ? ? FROM = ...
> ? ? MSGBODY = ...
>
> ? ? done = sendmail(MAILSERVER, FROM, listTo, MSGBODY)
> ? ? done.addErrback(err)
> ? ? done.addCallback(lambda ignored: reactor.stop())
> ? ? reactor.run()
>
> Jean-Paul

Hi Jean-Paul
This is what I'm searching for ,Thanks a lot
Based on your posting I wrote a programme,but it showed me a error
like

"Failure: twisted.mail.smtp.SMTPDeliveryError: 554 No recipients
accepted"
and
"Relay access denied" errors

I can clearly figure out, that this error is because, i haven't
authenticated my email account to send mail.
I have username and password of smpt server ,how to authenticate in
Twisted Framework


From sasurve at gmail.com  Thu May  7 02:06:44 2009
From: sasurve at gmail.com (shruti surve)
Date: Thu, 7 May 2009 11:36:44 +0530
Subject: About Odfpy links
Message-ID: <862e00220905062306q6b7519e3h3a1ece11c8dd9462@mail.gmail.com>

hey all,
 For my project, i am using ODFpy open office spreadsheets. I am creating
ledgers in python ie.ledger.py.  So when i run ledger.py, spreadsheet will
be opened in open office. since ledger is made of number of accounts, i am
creating multiple tables for all accounts in single spreadsheet. So, there
are number of tables in one spreadsheet.  Now i want create links in each
table of spreadsheet so that i can connect multiple tables. SO can anyone
please tell me how to create links in odfpy..
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From steven at REMOVE.THIS.cybersource.com.au  Thu May  7 02:29:57 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 06:29:57 GMT
Subject: Why there is a parameter named "self" for classmethod function?
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
	<4A024F18.9080407@kbsymanzik.org>
	<mailman.5206.1241671190.11746.python-list@python.org>
Message-ID: <pan.2009.05.07.06.29.56@REMOVE.THIS.cybersource.com.au>

On Thu, 07 May 2009 00:39:28 -0400, Terry Reedy wrote:

> Functions that refer to neither the class nor an instance thereof can
> usually be moved outside the class altogether.  Python is not Java.  I
> believe staticmethod() was mainly added because it is needed for
> .__new__(), at least in some appearances.


Can be, but if there's reason enough to keep it with a class, there's no 
reason not to. Sometimes I have a class with a few methods that share 
common code, but that code happens to not include self (or cls). Since 
the common code is only of interest to that class, even though it doesn't 
need the instance, I factor the common code out into a method.

This would be a good candidate for a staticmethod, only due to laziness I 
don't usually bother :)


-- 
Steven


From ldo at geek-central.gen.new_zealand  Thu May  7 02:43:02 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 07 May 2009 18:43:02 +1200
Subject: Logging exceptions to a file
References: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>
Message-ID: <gttvtn$nu4$4@lust.ihug.co.nz>

In message <597627b8-
d30b-4b74-9202-9cd46fb1d129 at s28g2000vbp.googlegroups.com>, Pierre GM wrote:

> ... I'd like to record (possibly unhandled) exceptions in the logfile.

    python myscript.py 2>error.log




From sasurve at gmail.com  Thu May  7 02:46:26 2009
From: sasurve at gmail.com (shruti surve)
Date: Thu, 7 May 2009 12:16:26 +0530
Subject: Python-list Digest, Vol 68, Issue 79
In-Reply-To: <mailman.18307.1241652495.11745.python-list@python.org>
References: <mailman.18307.1241652495.11745.python-list@python.org>
Message-ID: <862e00220905062346te99fe1bk320fd5bd43c37fcb@mail.gmail.com>

>
>
>   3. Re: About ODFPY links (Terry Reedy)
>
>
>
>
>
>
> ---------- Forwarded message ----------
> From: Terry Reedy <tjreedy at udel.edu>
> To: python-list at python.org
> Date: Wed, 06 May 2009 19:02:59 -0400
> Subject: Re: About ODFPY links
> shruti surve wrote:
>
>> hey all,
>>  For my project, i am using ODFpy open office spreadsheets. I am creating
>> ledgers in python ie.ledger.py <http://ie.ledger.py>.  So when i run
>> ledger.py, spreadsheet will be opened in open office. since ledger is made
>> of number of accounts, i am creating multiple tables for all accounts in
>> single spreadsheet. So, there are number of tables in one spreadsheet.  Now
>> i want create links in each table of spreadsheet so that i can connect
>> multiple tables. SO can anyone please tell me how to create links in odfpy..
>>
>
> The general answer to such questions is to make a minimal doc in some ODF
> application such of OOo that has the desired feature, save, open the doc as
> a zip file (unless saved as xml) and extract the pieces as xml. Then find
> the text that represents that feature.  There is a close correspondance
> between the xml and the internal document object model created by odfpy (and
> OOo, etc).
>
> In your case, make a spreadsheet with two table.  Give one one literal
> entry.  Give the other one entry that links to the first.  Then look in the
> xml to see how links are presented.  That should give a hint as to how to do
> the same in odfpy.  Then try to recreate the minimal doc with odfpy and look
> at the xml *it* produces.  If it looks similar enough, open with OOo to see
> what you get.
>
> tjr



hi
 i have tried that and i found <text:p><text:a xlink:href="#Sheet2"
office:target-frame-name="_self">Investments</text:a></text:p>...so in my
ledger.py i have written:

            para = P(text=lst_debit[i][0])


lan=A(href=lst_debit[i][0],targetframename="_self",text=lst_debit[i][0])

            lan.addElement(para)
            tc.addElement(lan)

            tr.addElement(tc)
(where lst_debit[i][0] is my account name coming from database)

 but still its not coming erroris :
in addElement
odf.element.IllegalChild: <text:p> is not allowed in <text:a>


i have tried it with:

tc.addElement(P(text=lst_credit[i][0]),A(href=lst_debit[i][0],targetframename="_self"))

but still its not coming, it is not giving any error, but not creating link,
giving simple text field.. so i basically i am not getting how to manage P
and A properties of cell together

Regards
shruti surve
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From OldGrantonian at googlemail.com  Thu May  7 03:03:11 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Thu, 7 May 2009 00:03:11 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
Message-ID: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>

I have Windows Vista Home Premium.

As a non-techy, I want to use "virtualenv"

I had Python 2.6 on my laptop.

I needed "easyinstall" to install virtualenv. During installation of
easyinstall, I got the message "Python 2.5 not found"

So I installed Python 2.5, then installed virtualenv

So I now have c:\Python 2.5 and c:\Python 2.6

On the virtualenv web site, the instructions for use are:

$ python virtualenv.py ENV

My question is, which "python" should I use on this command line: 2.5
or 2.6?

BTW: I am currently running a Python app using 2.6. I want to install
a beta upagrade of this app, without interfering with my current
setup, so the app developer recommends using virtualenv.


From googler.1.webmaster at spamgourmet.com  Thu May  7 03:20:09 2009
From: googler.1.webmaster at spamgourmet.com (googler.1.webmaster at spamgourmet.com)
Date: Thu, 7 May 2009 00:20:09 -0700 (PDT)
Subject: Threading and GIL
References: <60538e1c-47ea-4120-bc91-a9dcebd8f14b@r34g2000vbi.googlegroups.com>
	<a8f972ee-4594-493d-8b53-4a037c0211c0@n4g2000vba.googlegroups.com>
Message-ID: <e352ad10-c812-4218-a7db-bc5a6aeef2d4@e23g2000vbe.googlegroups.com>

Hi,

thats the reason why its not working. Imagine the end() method of the
thread object is called so the C++ Function is opened where the code
for this method is in.

At a line the Code ...->End() is called which waits that the C++
Thread class
is finished. BUT here is the problem: In the Method of the C++ class
which is in threaded mode can't run because its still waiting that the
GIL
is released by the thread which executed the ->End() command.

So the app has a deadlock when it arrives at       ->End() and
PyGILState_Ensure
function.


From fetchinson at googlemail.com  Thu May  7 03:29:29 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Thu, 7 May 2009 00:29:29 -0700
Subject: [Python-Dev] [RELEASED] Python 3.1 beta 1
In-Reply-To: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com>
References: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com>
Message-ID: <fbe2e2100905070029o75687a0eq114808139838be08@mail.gmail.com>

> On behalf of the Python development team, I'm thrilled to announce the first
> and
> only beta release of Python 3.1.
..............
> Other features include an ordered dictionary implementation

Are there plans for backporting this to python 2.x just as
multiprocessing has been?

I know that there are several ordered dictionary implementations for
2.x but they are all a little bit different from the one going into
3.1, hence my question.

Cheers,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From Lacrima.Maxim at gmail.com  Thu May  7 03:34:52 2009
From: Lacrima.Maxim at gmail.com (Lacrima)
Date: Thu, 7 May 2009 00:34:52 -0700 (PDT)
Subject: Checking for required arguments when instantiating class.
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
	<m21vr2mnac.fsf@cs.uu.nl>
	<mailman.5149.1241613418.11746.python-list@python.org>
Message-ID: <7c9defb8-9b4a-4062-a79f-ff6683c6c9f6@m24g2000vbp.googlegroups.com>

On May 6, 3:36?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Wed, May 6, 2009 at 5:24 AM, Piet van Oostrum <p... at cs.uu.nl> wrote:
>
>
>
> >>>>>> Lacrima <Lacrima.Ma... at gmail.com> (L) wrote:
>
> >>L> Hello!
> >>L> For example I have two classes:
>
> >>>>>> class First:
> >>L> ? ? def __init__(self, *args, **kwargs):
> >>L> ? ? ? ? ? ? pass
>
> >>>>>> class Second:
> >>L> ? ? def __init__(self, somearg, *args, **kwargs):
> >>L> ? ? ? ? ? ? self.somearg = somearg
>
> >>L> How can I test that First class takes 1 required argument and Second
> >>L> class takes no required arguments?
> >>L> So that I could instantiate them in a for loop.
>
> >>>>>> a = [First, Second]
> >>>>>> for cls in a:
> >>L> ? ? instance = cls()
>
> >>L> Traceback (most recent call last):
> >>L> ? File "<pyshell#22>", line 2, in <module>
> >>L> ? ? instance = cls()
> >>L> TypeError: __init__() takes at least 2 arguments (1 given)
>
> >>L> Of course, I can do like this:
> >>>>>> for cls in a:
> >>L> ? ? try:
> >>L> ? ? ? ? ? ? instance = cls()
> >>L> ? ? except TypeError:
> >>L> ? ? ? ? ? ? instance = cls('hello')
>
> >>>>>> print instance.somearg
> >>L> hello
>
> >>L> But what if I have to instantiate any class with 3 or 4 required
> >>L> arguments? How can I do it?
>
> > cls.__init__.im_func.__code__.co_argcount
>
> > This will include self, so it will be 1 in First and 2 in Second.
>
> AFAICT, that would count non-required arguments too, which isn't
> strictly what the OP requested.
>
> > However this is very dirty trickery and should not be recommended. It
> > may also change in future versions and other implementations of Python.
>
> Very much agreed.
>
> > I think it would be cleaner to put a class attribute in the classes that
> > defines how they should be initialized (e.g. just the number of required
> > arguments or more specific information) or have a special factory method
> > for this use case.
>
> Seconded. I'd recommend the latter personally, though it's impossible
> to give a definitive answer without more context.
>
> Cheers,
> Chris
> --http://blog.rebertia.com

Thanks for all of you!

I think I'll try to write a special method for this case and will
report you result.

-Max


From steven at REMOVE.THIS.cybersource.com.au  Thu May  7 03:46:06 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 07 May 2009 07:46:06 GMT
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
Message-ID: <pan.2009.05.07.07.46.05@REMOVE.THIS.cybersource.com.au>

On Thu, 07 May 2009 00:03:11 -0700, OldGrantonian wrote:

> So I now have c:\Python 2.5 and c:\Python 2.6
> 
> On the virtualenv web site, the instructions for use are:
> 
> $ python virtualenv.py ENV
> 
> My question is, which "python" should I use on this command line: 2.5 or
> 2.6?

I'm not an expert on virtualenv, nor do I use Windows, but I'd start off 
with this:

$ c:\Python 2.5\python.exe vitualenv.py ENV


and if that doesn't do what you expect, report the precise error you get 
and hopefully somebody who knows more about Windows can help.




-- 
Steven


From __peter__ at web.de  Thu May  7 04:01:57 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 07 May 2009 10:01:57 +0200
Subject: Simple way of handling errors
References: <2009050616401916807-tomfsessile@gmailcom>
Message-ID: <gtu4hj$ll7$00$1@news.t-online.com>

TomF wrote:

> As a relative newcomer to Python, I like it a lot but I'm dismayed at
> the difficulty of handling simple errors.  In Perl if you want to
> anticipate a file-not-found error you can simply do:
> 
> open($file)  or die("open($file): $!");
> 
> and you get an intelligible error message.  In Python, to get the same
> thing it appears you need at least:
> 
> try:
>     f=open(file)
> except IOError, err:
>     print "open(%s): got %s" % (file, err.strerror)
>     exit(-1)
> 
> Is there a simpler interface or idiom for handling such errors?  I
> appreciate that Python's exception handling is much more sophisticated
> but often I don't need it.
> 
> -Tom

While you are making the transition you could write

from perl_idioms import open_or_die

f = open_or_die("does-not-exist")


with the perl_idioms module looking like

import sys

def open_or_die(*args):
    try:
        return open(*args)
    except IOError, e:
        sys.exit(e)

Peter



From r-w at inet.net.au  Thu May  7 04:41:04 2009
From: r-w at inet.net.au (r-w)
Date: Thu, 07 May 2009 18:41:04 +1000
Subject: idea
Message-ID: <4A029EA0.3030403@inet.net.au>

Redirect sys.stderr to the log file in ANUGA logging.
This might catch unexpected exceptions.


From lie.1296 at gmail.com  Thu May  7 05:08:17 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 07 May 2009 09:08:17 GMT
Subject: list comprehension question
In-Reply-To: <pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>	<85ocucnbce.fsf@agentultra.com>	<mailman.4923.1241193638.11746.python-list@python.org>	<85ljpb8r1o.fsf@agentultra.com>	<mailman.5109.1241543371.11746.python-list@python.org>	<85d4am8hq4.fsf@agentultra.com>
	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
Message-ID: <5yxMl.9285$y61.6301@news-server.bigpond.net.au>

Steven D'Aprano wrote:
>> "If you?ve got the stomach for it, list comprehensions can be nested.
>> They are a powerful tool but ? like all powerful tools ? they need to be
>> used carefully, if at all."
> 
> How does this discourage the use of list comprehensions? At most, it 
> warns that complicated list comps are tricky. Complicated *anything* are 
> tricky.
> 
> 
>> and
>>
>> "In real world, you should prefer builtin functions to complex flow
>> statements."
> 
> That's ridiculous. The example given is a special case. That's like 
> saying "Loops are hard, so in the real world, if you want a loop, find a 
> builtin function that does what you want instead."
> 
> What's the "builtin function" we're supposed to prefer over a "complex 
> flow statement" like this?
> 
> # split text into word fragments of length <= 3
> sentence = "a sentence is a series of words"
> new = [word[i:i+3] for word in sentence.split() for i in range(0, len(word), 3)]

I often found list comprehension *more* readable than the equivalent 
for-loop because of its density. Seeing complex for-loop requires one 
step of thinking for each line, but in list comprehension I can skip 
some of the steps because I know what list comprehension would roughly 
look like.

i.e.

when I process this:

lst = []              #1
for i in range(10):   #2
     lst.append(i)     #3

I do 3 steps of thinking for each line

but seeing this is only one step, since I know it is going to create new 
list (skipping step #1) and I know i will be appended to that list 
(skipping step #3)


From lie.1296 at gmail.com  Thu May  7 05:18:56 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 07 May 2009 09:18:56 GMT
Subject: list comprehension question
In-Reply-To: <5yxMl.9285$y61.6301@news-server.bigpond.net.au>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>	<85ocucnbce.fsf@agentultra.com>	<mailman.4923.1241193638.11746.python-list@python.org>	<85ljpb8r1o.fsf@agentultra.com>	<mailman.5109.1241543371.11746.python-list@python.org>	<85d4am8hq4.fsf@agentultra.com>
	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
	<5yxMl.9285$y61.6301@news-server.bigpond.net.au>
Message-ID: <4IxMl.9287$y61.5756@news-server.bigpond.net.au>

Lie Ryan wrote:
> Steven D'Aprano wrote:
>>> "If you?ve got the stomach for it, list comprehensions can be nested.
>>> They are a powerful tool but ? like all powerful tools ? they need to be
>>> used carefully, if at all."
>>
>> How does this discourage the use of list comprehensions? At most, it 
>> warns that complicated list comps are tricky. Complicated *anything* 
>> are tricky.
>>
>>
>>> and
>>>
>>> "In real world, you should prefer builtin functions to complex flow
>>> statements."
>>
>> That's ridiculous. The example given is a special case. That's like 
>> saying "Loops are hard, so in the real world, if you want a loop, find 
>> a builtin function that does what you want instead."
>>
>> What's the "builtin function" we're supposed to prefer over a "complex 
>> flow statement" like this?
>>
>> # split text into word fragments of length <= 3
>> sentence = "a sentence is a series of words"
>> new = [word[i:i+3] for word in sentence.split() for i in range(0, 
>> len(word), 3)]
> 
> I often found list comprehension *more* readable than the equivalent 
> for-loop because of its density. Seeing complex for-loop requires one 
> step of thinking for each line, but in list comprehension I can skip 
> some of the steps because I know what list comprehension would roughly 
> look like.
> 
> i.e.
> 
> when I process this:
> 
> lst = []              #1
> for i in range(10):   #2
>     lst.append(i)     #3
> 
> I do 3 steps of thinking for each line
> 
> but seeing this is only one step, since I know it is going to create new 
> list (skipping step #1) and I know i will be appended to that list 
> (skipping step #3)

I don't know what I was thinking before sending that last line, here is 
what it was supposed to be:

but in list comprehension I see this in only one step, since I know it 
is going to create new list (skipping step #1) and I know 'i' will be 
appended to that list (skipping step #3) and this also continues to 
nested list comprehensions


From antroy at gmail.com  Thu May  7 05:20:03 2009
From: antroy at gmail.com (Ant)
Date: Thu, 7 May 2009 02:20:03 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
Message-ID: <c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>

On May 7, 8:03?am, OldGrantonian <OldGranton... at googlemail.com> wrote:
...
> I had Python 2.6 on my laptop.
>
> I needed "easyinstall" to install virtualenv. During installation of
> easyinstall, I got the message "Python 2.5 not found"
>
> So I installed Python 2.5, then installed virtualenv
>
> So I now have c:\Python 2.5 and c:\Python 2.6
...

Sounds like you've downloaded the Python 2.5 version of Easy Install.
If I were you I'd uninstall Python 2.5, and re-install easy_install
using the correct exe for Python 2.6.

Check that typing 'python' on the commandline still works, as
installing and uninstalling 2.5 may have messed up your path. if it
has, either manually add the Python install directory to the path, or
reinstall Python 2.6.

Note: have you changed the default install folder? I haven't got
Vista, but on XP it installs to c:\Python26 not "C:\Python 2.6". I'd
be carefull of changing the default install directory of Python,
particularly if you are "non-techy" as some packages installers may
look for Python in the default location.

--
Ant


From lie.1296 at gmail.com  Thu May  7 05:23:30 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 07 May 2009 09:23:30 GMT
Subject: list comprehension question
In-Reply-To: <0_qdnYwTacv122bUnZ2dnUVZ_rqdnZ2d@pdx.net>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<50697b2c0904301805p7158e167n7f84b18afd0f55f3@mail.gmail.com>	<49FB2225.4030601@councilforeconed.org>
	<mailman.4930.1241197210.11746.python-list@python.org>
	<0_qdnYwTacv122bUnZ2dnUVZ_rqdnZ2d@pdx.net>
Message-ID: <mMxMl.9289$y61.3464@news-server.bigpond.net.au>

Scott David Daniels wrote:
> John Posner wrote:
>> Shane Geiger wrote:
>>>    if type(el) == list or type(el) is tuple:
>> A tiny improvement:
>>
>>        if type(el) in (list, tuple):
> 
> or (even better)
>     if isinstance(el, (list, tuple))
> 
> However, it is my contention that you shouldn't be flattening by type --
> you should know where, explicitly to flatten.  If I have 3-D points as
> triples, a tree of points would, by this code, get flattened into a
> a list of numbers.   If, however, I create a class with the same
> elements, but a method or two, suddenly flatten will produce a list
> of points.  It is my contention that the tree abstraction should be
> responsible for producing its leaves, rather than a blunderbus that
> doesn't know where one container abstraction ends, and its contents
> begin.  In other words, I'd like to see thigs like "flatten one layer."

Maybe that is why some modules like PIL or pygame accepts list of 
coordinates in flattened list of number instead of nested (i.e. they 
accepts [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] and do the grouping 
themself).


From lie.1296 at gmail.com  Thu May  7 05:32:38 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 07 May 2009 09:32:38 GMT
Subject: Logging exceptions to a file
In-Reply-To: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>
References: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>
Message-ID: <WUxMl.9292$y61.2903@news-server.bigpond.net.au>

Pierre GM wrote:
> All,
> I need to log messages to both the console and a given file. I use the
> following code (on Python 2.5)
> 
>>>> import logging
>>>> #
>>>> logging.basicConfig(level=logging.DEBUG,)
>>>> logfile = logging.FileHandler('log.log')
>>>> logfile.setLevel(level=logging.INFO)
>>>> logging.getLogger('').addHandler(logfile)
>>>> #
>>>> mylogger = logging.getLogger('mylogger')
>>>> #
>>>> mylogger.info("an info message")
> 
> So far so good, but I'd like to record (possibly unhandled) exceptions
> in the logfile.
> * Do I need to explicitly trap every single exception ?
> * In that case, won't I get 2 log messages on the console (as
> illustrated in the code below:
>>>> try:
>>>>     1/0
>>>> except ZeroDivisionError:
>>>>     mylogger.exception(":(")
>>>>     raise
> 
> Any comments/idea welcomed
> Cheers.
> 

Although it is usually not recommended to use a catch-all except, this 
is the case where it might be useful. JUST DON'T FORGET TO RE-RAISE THE 
EXCEPTION.

if __name__ == '__main__':
     try:
         main():
     except Exception, e:
         # log('Unhandled Exception', e)
         raise


From cournape at gmail.com  Thu May  7 05:33:10 2009
From: cournape at gmail.com (David Cournapeau)
Date: Thu, 7 May 2009 18:33:10 +0900
Subject: Statically linked extension and relative import
Message-ID: <5b8d13220905070233m4140472xd8fbcdc74985d073@mail.gmail.com>

Hi,

I am trying to build a 3rd party extension and link it statically to
python. I managed to get things working by customizing Setup.local in
python source tree, but I have a problem for imports of the 'foo.bar'
form. For example, let's say the 3rd party module is laid out as
follows:

foo/__init__.py
foo/bar.so

and __init__.py contains:
import foo.bar

I can build the bar extension and link it statically to python such as
from python, "import bar" works. But how can I make it "recognize"
"from foo import bar" ? I tried to understand how this works at the C
level in import.c, but I am a bit lost in the code. The ultimate goal
is to manage to get code coverage of the C code of the extension
through gcov, which does not support coverage of shared libraries ATM.

thanks,

David


From deets at nospam.web.de  Thu May  7 06:26:59 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 12:26:59 +0200
Subject: idea
References: <4A029EA0.3030403@inet.net.au>
Message-ID: <76fr8gF1cosptU1@mid.uni-berlin.de>

r-w wrote:

> Redirect sys.stderr to the log file in ANUGA logging.
> This might catch unexpected exceptions.

brillant.

Diez


From OJOHANS at StatoilHydro.com  Thu May  7 06:54:45 2009
From: OJOHANS at StatoilHydro.com (=?iso-8859-1?Q?=D8ystein_Johansen_=28OJOHANS=29?=)
Date: Thu, 7 May 2009 12:54:45 +0200
Subject: subprocess.Popen howto?
Message-ID: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>

Hi,
 
I have problems understanding the subprocess.Popen object. I have a iterative calculation in a process running and I want to pipe the output (stdout) from this calculation to a Python script.
 
Let me include a simple code that simulates the calculating process:
/* This code simulates a big iterative calculation */
#include <stdio.h>
#include <math.h>
 
int main()
{
 float val[2] = { M_PI, M_E };
 int i;
 
 for ( i = 0; i < 2 i++) {
  sleep( 15 );   /* It's a hard calculation. It take 15 seconds */
  printf("Value: %5.6f\n", val[i] );
  fflush( stdout );
 }
 return 0;
}
 
let's compile this to mycalc: gcc -o mycalc calc.c ... (untested code)
 
In C I have this code which starts the mycalc process and handles the output from it:
 
#include <stdio.h>
#include <assert.h>
#define BUF_SIZE 256
 
int main()
{
 FILE *pip;
 char line[BUF_SIZE];
 
 pip = popen("mycalc", "r");
 assert( pip != NULL );
 
 while ( fgets( line, BUF_SIZE, pip )) {
  printf( "Hello; I got: %s \n", line );
  fflush( stdout );
 }
 pclose( pip );
 return 0;
}

How can I make such while-loop in Python? I assume I should use subprocess.Popen(), but I can't figure out how?
 
-?ystein
 
 


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From OldGrantonian at googlemail.com  Thu May  7 06:58:50 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Thu, 7 May 2009 03:58:50 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
Message-ID: <61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com>

Thanks to both Steven D'Aprano and Ant :)

>>  Sounds like you've downloaded the Python 2.5 version of Easy Install.

There's no Python 2.6 version of EasyInstall :(

For 2.5, there is:

setuptools-0.6c9.win32-py2.5.exe

But for 2.6, it's:

setuptools-0.6c9-py2.6.egg

For any other egg file, I would use EasyInstall, but I don't think I
can use EasyInstall to install EasyInstall :)


From deets at nospam.web.de  Thu May  7 07:01:02 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 13:01:02 +0200
Subject: The Fujitsu Lifebook A6120
References: <7498de19-2aa8-4e3f-9988-8bb59fde8ff2@x1g2000prh.googlegroups.com>
	<gtu0am$6tu$1@aioe.org>
Message-ID: <76ft8aF1cqqq0U1@mid.uni-berlin.de>

> 
> Does it run Python?
> 
> (sorry, could not resist....)

You could at least resist to quote the spammers url, so it doesn't get
higher pagerank.

Diez 



From ggardiner at iee.org  Thu May  7 07:08:52 2009
From: ggardiner at iee.org (Geoff Gardiner)
Date: Thu, 07 May 2009 12:08:52 +0100
Subject: How do I test the integrity of a Python installation in Debian and
	Ubuntu
Message-ID: <4A02C144.1010704@iee.org>

How do I assure myself of the integrity of a Python installation
acquired using apt-get install on Debian and Ubuntu?

I can run regrtest but there's nothing in the basic installation to run,
viz.:

gegard at gegard:~$ python
Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52)
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from test import regrtest
>>> regrtest.main()
test_grammar
test_grammar skipped -- No module named test_grammar
... <etc> more of the same...
9 tests skipped:
    test_builtin test_doctest test_doctest2 test_exceptions
    test_grammar test_opcodes test_operations test_types test_unittest
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/test/regrtest.py", line 416, in main
    e = _ExpectedSkips()
  File "/usr/lib/python2.5/test/regrtest.py", line 1321, in __init__
    from test import test_socket_ssl
ImportError: cannot import name test_socket_ssl
>>>

I don't see where to go from here, so advice would be extremely helpful.

Background

I have a large Python-based system that I am trying to install on an
externally-hosted VM. It doesn't build and install correctly most of the
time, and I have tried successive images of Debian Lenny and Ubuntu
Hardy with mostly different build/installation results each time.

The installation proceeds Ok on a local Ubuntu VM.

A number of modules are installed in addition to python, but I can't
even see how to test the core python installation. There are few
test_*.py files in the installation.

I have previously encountered a fault on the server hosting the VM and
would like to be more comfortable that the python installation itself is
Ok (or have evidence that it's not).

Thank you,
Geoff



From castironpi at gmail.com  Thu May  7 07:27:15 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Thu, 7 May 2009 04:27:15 -0700 (PDT)
Subject: Why there is a parameter named "self" for classmethod function?
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com> 
	<4A024F18.9080407@kbsymanzik.org>
	<mailman.5206.1241671190.11746.python-list@python.org> 
	<pan.2009.05.07.06.29.56@REMOVE.THIS.cybersource.com.au>
Message-ID: <2c80e8d0-cc44-48b3-8b90-7b165eb20ed4@g20g2000vba.googlegroups.com>

On May 7, 1:29?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Thu, 07 May 2009 00:39:28 -0400, Terry Reedy wrote:
> > Functions that refer to neither the class nor an instance thereof can
> > usually be moved outside the class altogether. ?Python is not Java. ?I
> > believe staticmethod() was mainly added because it is needed for
> > .__new__(), at least in some appearances.
>
> Can be, but if there's reason enough to keep it with a class, there's no
> reason not to. Sometimes I have a class with a few methods that share
> common code, but that code happens to not include self (or cls). Since
> the common code is only of interest to that class, even though it doesn't
> need the instance, I factor the common code out into a method.
>
> This would be a good candidate for a staticmethod, only due to laziness I
> don't usually bother :)
>
> --
> Steven

It's also useful if you want to access the function using the syntax
of attributes, as in 'self.amethod' where 'amethod' is a static
method.  If I understand correctly, no bound method is created if the
function is static, and as such, the decorator can increase
performance.

> Can be, but if there's reason enough to keep it with a class, there's no
> reason not to.

That's a bit of hyperbole; the usual reasons such as code bloat,
namespace bloat, maintainability etc. all weigh against it.  It's just
that the benefits weigh heavier.

There is something that is 'correct' about it IMO, that is, provides
syntax to what is valid semantics in an OO context.  That may just be
another way of stating the thesis though.


From duncan.booth at invalid.invalid  Thu May  7 07:34:01 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 7 May 2009 11:34:01 GMT
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com>
Message-ID: <Xns9C047FE3D4338duncanbooth@127.0.0.1>

OldGrantonian <OldGrantonian at googlemail.com> wrote:

> Thanks to both Steven D'Aprano and Ant :)
> 
>>>  Sounds like you've downloaded the Python 2.5 version of Easy Install.
> 
> There's no Python 2.6 version of EasyInstall :(

I wonder what I've been running then?

> 
> For 2.5, there is:
> 
> setuptools-0.6c9.win32-py2.5.exe
> 
> But for 2.6, it's:
> 
> setuptools-0.6c9-py2.6.egg
> 
> For any other egg file, I would use EasyInstall, but I don't think I
> can use EasyInstall to install EasyInstall :)

No, but you can use ez_setup.

Go to http://peak.telecommunity.com/dist/ez_setup.py and save the content 
of that file as ez_setup.py (cut and paste into your favourite editor may 
be the simplest way) then run it with your chosen Python. It will find and 
install the appropriate version of easy install.



-- 
Duncan Booth http://kupuguy.blogspot.com


From andymac at bullseye.apana.org.au  Thu May  7 07:34:22 2009
From: andymac at bullseye.apana.org.au (Andrew MacIntyre)
Date: Thu, 07 May 2009 21:34:22 +1000
Subject: Statically linked extension and relative import
In-Reply-To: <5b8d13220905070233m4140472xd8fbcdc74985d073@mail.gmail.com>
References: <5b8d13220905070233m4140472xd8fbcdc74985d073@mail.gmail.com>
Message-ID: <4A02C73E.8040105@bullseye.andymac.org>

David Cournapeau wrote:
> Hi,
> 
> I am trying to build a 3rd party extension and link it statically to
> python. I managed to get things working by customizing Setup.local in
> python source tree, but I have a problem for imports of the 'foo.bar'
> form. For example, let's say the 3rd party module is laid out as
> follows:
> 
> foo/__init__.py
> foo/bar.so
> 
> and __init__.py contains:
> import foo.bar
> 
> I can build the bar extension and link it statically to python such as
> from python, "import bar" works. But how can I make it "recognize"
> "from foo import bar" ? I tried to understand how this works at the C
> level in import.c, but I am a bit lost in the code. The ultimate goal
> is to manage to get code coverage of the C code of the extension
> through gcov, which does not support coverage of shared libraries ATM.

If you link the bar extension statically, it is not in the foo package
namespace (which is why "import bar" works), so should be imported as bar
in foo's __init__.py.

from foo import bar

should then work from other code by virtue of the package namespace
(instantiated by __init__.py) then having a bar symbol.

-- 
-------------------------------------------------------------------------
Andrew I MacIntyre                     "These thoughts are mine alone..."
E-mail: andymac at bullseye.apana.org.au  (pref) | Snail: PO Box 370
        andymac at pcug.org.au             (alt) |        Belconnen ACT 2616
Web:    http://www.andymac.org/               |        Australia


From cournape at gmail.com  Thu May  7 07:45:17 2009
From: cournape at gmail.com (David Cournapeau)
Date: Thu, 7 May 2009 20:45:17 +0900
Subject: Statically linked extension and relative import
In-Reply-To: <4A02C73E.8040105@bullseye.andymac.org>
References: <5b8d13220905070233m4140472xd8fbcdc74985d073@mail.gmail.com>
	<4A02C73E.8040105@bullseye.andymac.org>
Message-ID: <5b8d13220905070445q7734fdffsff108c04e492a74a@mail.gmail.com>

On Thu, May 7, 2009 at 8:34 PM, Andrew MacIntyre
<andymac at bullseye.apana.org.au> wrote:
> David Cournapeau wrote:
>>
>> Hi,
>>
>> I am trying to build a 3rd party extension and link it statically to
>> python. I managed to get things working by customizing Setup.local in
>> python source tree, but I have a problem for imports of the 'foo.bar'
>> form. For example, let's say the 3rd party module is laid out as
>> follows:
>>
>> foo/__init__.py
>> foo/bar.so
>>
>> and __init__.py contains:
>> import foo.bar
>>
>> I can build the bar extension and link it statically to python such as
>> from python, "import bar" works. But how can I make it "recognize"
>> "from foo import bar" ? I tried to understand how this works at the C
>> level in import.c, but I am a bit lost in the code. The ultimate goal
>> is to manage to get code coverage of the C code of the extension
>> through gcov, which does not support coverage of shared libraries ATM.
>
> If you link the bar extension statically, it is not in the foo package
> namespace (which is why "import bar" works),

Yes, I understand this.

> so should be imported as bar
> in foo's __init__.py.
>
> from foo import bar

But then I have to modify the 3rd party package for statically linked
versions. This means in particular that the same source cannot be used
for static and dynamic builds ?

cheers,

David


From deank at yahoo.com  Thu May  7 08:25:55 2009
From: deank at yahoo.com (dean)
Date: Thu, 7 May 2009 14:25:55 +0200
Subject: ply and threads
Message-ID: <69x52b9mwk23.1efmsdyffrpz4$.dlg@40tude.net>

I have two threads that exchange information by passing messages. I wanted
to parse those messages with ply. I'd prefer using two independent parsers
so that I can avoid using locks.

Can somebody explain how to do this with ply? Ply seems to be doing a lot
of odd things, such as reading the the python file that imported it,
reading doc strings of it's functions, etc, so I'm not sure how to make
this thread safe. This is from yacc.py:

# The current implementation is only somewhat object-oriented. The
# LR parser itself is defined in terms of an object (which allows multiple
# parsers to co-exist).  However, most of the variables used during table
# construction are defined in terms of global variables.  Users shouldn't
# notice unless they are trying to define multiple parsers at the same
# time using threads (in which case they should have their head examined).

It would seem that creating two parsers in the main thread, and then
passing one of them to the other thread, is all I need to do to be thread
safe?

But then again I'm not even sure how to create two parsers. Examples I've
seen just call yacc.yacc() at the end, and do not even access yacc
instances.

Any help is appreciated and thanks in advance.

Dean


From garryvin at gmail.com  Thu May  7 08:49:31 2009
From: garryvin at gmail.com (garryvin)
Date: Thu, 7 May 2009 05:49:31 -0700 (PDT)
Subject: Open the franchisee of Karvy
Message-ID: <0c55a0e5-fb85-41db-acb4-222e0d0f42fc@y6g2000prf.googlegroups.com>

Karvy stock broking introduces, Karvy Fortune a business opportunity
for individuals in similar business from Karvy, it gives the
opportunity to associate with ?Karvy Family? as Franchisee, Remisser,
or as an Independent Financial Advisors. Karvy Stock Broking Ltd ranks
among 5 stock brokers in India, it ranks among top 5 Depositary
Participants in India, with the huge net work of over 500 branches in
375 locations across India and overseas at Dubai, executes 150,000+
trades in NSE/BSE. Karvy Has a top notch research team, advisory team,
technology support team to serve it?s customers in 24/7 manner.
http://www.karvy.com/v2/fortune/fortunegroups/index.asp


From matt at tplus1.com  Thu May  7 08:58:50 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Thu, 07 May 2009 12:58:50 GMT
Subject: How should I use grep from python?
Message-ID: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>

I'm writing a command-line application and I want to search through lots
of text files for a string.  Instead of writing the python code to do
this, I want to use grep.

This is the command I want to run:

$ grep -l foo dir

In other words, I want to list all files in the directory dir that
contain the string "foo".

I'm looking for the "one obvious way to do it" and instead I found no
consensus.  I could os.popen, commands.getstatusoutput, the subprocess
module, backticks, etc.  

As of May 2009, what is the recommended way to run an external process
like grep and capture STDOUT and the error code?


TIA

Matt


From google at mrabarnett.plus.com  Thu May  7 09:03:54 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 07 May 2009 14:03:54 +0100
Subject: Code works fine except...
In-Reply-To: <b2cf45ed-d3da-4d93-883c-c8985d40ad55@r34g2000vba.googlegroups.com>
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com>
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com>
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com>
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com>
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com>
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>
	<mailman.5111.1241544824.11746.python-list@python.org>	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com>
	<mailman.5143.1241594966.11746.python-list@python.org>	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>	<1d8802ff-8211-467f-95c1-4616e3bd7300@s20g2000vbp.googlegroups.com>
	<b2cf45ed-d3da-4d93-883c-c8985d40ad55@r34g2000vba.googlegroups.com>
Message-ID: <4A02DC3A.6050300@mrabarnett.plus.com>

John Yeung wrote:
> On May 7, 12:30 am, Ross <ross.j... at gmail.com> wrote:
>> If I were to set up a dictionary that counted players used in the bye
>> list and only allowed players to be added to the bye list if they were
>> within 2 of the least used player, would this be a good approach for
>> managing bye selection or would using a dictionary in this manner be
>> unnecessary/redundant?
> 
> I certainly have not proved it, but I think you don't need to resort
> to anything fancy if you are OK with the maximum byes being within two
> of the minimum byes.  (Maybe this needs to be larger with larger
> numbers of players.)  Try using your original shuffle but instead of
> selecting matches to "throw away" each week, just use the matches you
> need (to fill up the courts) and pick up where you left off the next
> week.  For example, with 10 players, each "round" ideally consists of
> five matches.  If you only have four courts, don't throw away the
> fifth match; save it as the first match next week.
> 
> To be honest, I didn't look too carefully at your original shuffle.
> It may be good enough.  It's a little different than the "standard"
> rotation as presented on Wikipedia:
> 
>   http://en.wikipedia.org/wiki/Round-robin_tournament#Scheduling_algorithm
> 
> The one on Wikipedia happened to pass my casual tests with no more
> than a 2-bye difference between the most-played and least-played
> players, and didn't run into the problem of scheduling the same player
> for two matches the same week.  But I have to stress I only tried a
> few starting values, which all worked; I didn't try to break it, or
> run an extensive battery of tests.
> 
It might be an idea to run an exhaustive test on small, but not too
small, values in order to see whether the minimum difference can, in
fact, be one. If the minimum difference turns out to be two then you
might as well stick to a simple algorithm, as long as its minimum
difference is two.


From piet at cs.uu.nl  Thu May  7 09:04:57 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Thu, 07 May 2009 15:04:57 +0200
Subject: Checking for required arguments when instantiating class.
References: <cd279a6b-480e-4e11-9f52-53398e6d5851@q2g2000vbr.googlegroups.com>
	<m21vr2mnac.fsf@cs.uu.nl>
	<mailman.5149.1241613418.11746.python-list@python.org>
Message-ID: <m2ocu5kqrq.fsf@cs.uu.nl>

>>>>> Chris Rebert <clp2 at rebertia.com> (CR) wrote:

>CR> On Wed, May 6, 2009 at 5:24 AM, Piet van Oostrum <piet at cs.uu.nl> wrote:
>>>>>>>> Lacrima <Lacrima.Maxim at gmail.com> (L) wrote:

>L> But what if I have to instantiate any class with 3 or 4 required
>L> arguments? How can I do it?
>>> 
>>> cls.__init__.im_func.__code__.co_argcount
>>> 
>>> This will include self, so it will be 1 in First and 2 in Second.

>CR> AFAICT, that would count non-required arguments too, which isn't
>CR> strictly what the OP requested.

If you mean, parameters with default values, yes. Of course you can find
out how many of these there are from cls.__init__.func_defaults, but
this will get dirtier and dirtier.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From deets at nospam.web.de  Thu May  7 09:09:53 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 15:09:53 +0200
Subject: How should I use grep from python?
References: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
Message-ID: <76g4ptF1ce8m3U1@mid.uni-berlin.de>

Matthew Wilson wrote:

> I'm writing a command-line application and I want to search through lots
> of text files for a string.  Instead of writing the python code to do
> this, I want to use grep.
> 
> This is the command I want to run:
> 
> $ grep -l foo dir
> 
> In other words, I want to list all files in the directory dir that
> contain the string "foo".
> 
> I'm looking for the "one obvious way to do it" and instead I found no
> consensus.  I could os.popen, commands.getstatusoutput, the subprocess
> module, backticks, etc.
> 
> As of May 2009, what is the recommended way to run an external process
> like grep and capture STDOUT and the error code?

subprocess. Which becomes pretty clear when reading it's docs:

"""
The subprocess module allows you to spawn new processes, connect to their
input/output/error pipes, and obtain their return codes. This module
intends to replace several other, older modules and functions, such as:
os.system
os.spawn*
os.popen*
popen2.*
commands.*
"""

Diez


From Scott.Daniels at Acm.Org  Thu May  7 09:12:08 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 07 May 2009 06:12:08 -0700
Subject: [Python-Dev] [RELEASED] Python 3.1 beta 1
In-Reply-To: <mailman.5207.1241681372.11746.python-list@python.org>
References: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com>
	<mailman.5207.1241681372.11746.python-list@python.org>
Message-ID: <_fKdncjfm5xjQZ_XnZ2dnUVZ_rSdnZ2d@pdx.net>

Daniel Fetchinson wrote:
>> Other features include an ordered dictionary implementation
> 
> Are there plans for backporting this to python 2.x just as
> multiprocessing has been?

Why not grab the 3.1 code and do it yourself for your 2.X's?
It should be far less work than attempting something as
fidgety as multiprocessing.

--Scott David Daniels
Scott.Daniels at Acm.Org



From pierregmcode at gmail.com  Thu May  7 09:19:02 2009
From: pierregmcode at gmail.com (Pierre GM)
Date: Thu, 7 May 2009 06:19:02 -0700 (PDT)
Subject: Logging exceptions to a file
References: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>
	<WUxMl.9292$y61.2903@news-server.bigpond.net.au>
Message-ID: <01129a12-312c-4cb9-a0f4-5a456bd9eb6a@e24g2000vbe.googlegroups.com>

On May 7, 5:32?am, Lie Ryan <lie.1... at gmail.com> wrote:
> Pierre GM wrote:
> > All,
> > I need to log messages to both the console and a given file. I use the
> > following code (on Python 2.5)
>
> >>>> import logging
> >>>> #
> >>>> logging.basicConfig(level=logging.DEBUG,)
> >>>> logfile = logging.FileHandler('log.log')
> >>>> logfile.setLevel(level=logging.INFO)
> >>>> logging.getLogger('').addHandler(logfile)
> >>>> #
> >>>> mylogger = logging.getLogger('mylogger')
> >>>> #
> >>>> mylogger.info("an info message")
>
> > So far so good, but I'd like to record (possibly unhandled) exceptions
> > in the logfile.
> > * Do I need to explicitly trap every single exception ?
> > * In that case, won't I get 2 log messages on the console (as
> > illustrated in the code below:
> >>>> try:
> >>>> ? ? 1/0
> >>>> except ZeroDivisionError:
> >>>> ? ? mylogger.exception(":(")
> >>>> ? ? raise
>
> > Any comments/idea welcomed
> > Cheers.
>
> Although it is usually not recommended to use a catch-all except, this
> is the case where it might be useful. JUST DON'T FORGET TO RE-RAISE THE
> EXCEPTION.
>
> if __name__ == '__main__':
> ? ? ?try:
> ? ? ? ? ?main():
> ? ? ?except Exception, e:
> ? ? ? ? ?# log('Unhandled Exception', e)
> ? ? ? ? ?raise

OK for a simple script, but the (unhandled) exceptions need to be
caught at the module level. Any idea?


From python.list at tim.thechases.com  Thu May  7 09:25:52 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 07 May 2009 08:25:52 -0500
Subject: How should I use grep from python?
In-Reply-To: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
References: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
Message-ID: <4A02E160.3090105@tim.thechases.com>

> I'm writing a command-line application and I want to search through lots
> of text files for a string.  Instead of writing the python code to do
> this, I want to use grep.
> 
> This is the command I want to run:
> 
> $ grep -l foo dir
> 
> In other words, I want to list all files in the directory dir that
> contain the string "foo".
> 
> I'm looking for the "one obvious way to do it" and instead I found no
> consensus.  I could os.popen, commands.getstatusoutput, the subprocess
> module, backticks, etc.  

While it doesn't use grep or external processes, I'd just do it 
in pure Python:

   def files_containing(location, search_term):
     for fname in os.listdir(location):
       fullpath = os.path.join(location, fname)
       if os.isfile(fullpath):
         for line in file(fullpath):
           if search_term in line:
             yield fname
             break
   for fname in files_containing('/tmp', 'term'):
     print fname

It's fairly readable, you can easily tweak the search methods 
(case sensitive, etc), change it to be recursive by using 
os.walk() instead of listdir(), it's cross-platform, and doesn't 
require the overhead of an external process (along with the 
"which call do I use to spawn the function" questions that come 
with it :)

However, to answer your original question, I'd use os.popen which 
is the one I see suggested most frequently.

-tkc





From jnoller at gmail.com  Thu May  7 09:28:46 2009
From: jnoller at gmail.com (Jesse Noller)
Date: Thu, 7 May 2009 09:28:46 -0400
Subject: [Python-Dev] [RELEASED] Python 3.1 beta 1
In-Reply-To: <_fKdncjfm5xjQZ_XnZ2dnUVZ_rSdnZ2d@pdx.net>
References: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com>
	<mailman.5207.1241681372.11746.python-list@python.org>
	<_fKdncjfm5xjQZ_XnZ2dnUVZ_rSdnZ2d@pdx.net>
Message-ID: <4222a8490905070628m22cb28eeiad04969822e741c@mail.gmail.com>

On Thu, May 7, 2009 at 9:12 AM, Scott David Daniels
<Scott.Daniels at acm.org> wrote:
> Daniel Fetchinson wrote:
>>>
>>> Other features include an ordered dictionary implementation
>>
>> Are there plans for backporting this to python 2.x just as
>> multiprocessing has been?
>
> Why not grab the 3.1 code and do it yourself for your 2.X's?
> It should be far less work than attempting something as
> fidgety as multiprocessing.
>
> --Scott David Daniels
> Scott.Daniels at Acm.Org

Don't worry, we gave multiprocessing some ADHD meds :)


From matt at tplus1.com  Thu May  7 09:31:44 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Thu, 07 May 2009 13:31:44 GMT
Subject: How should I use grep from python?
References: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
	<76g4ptF1ce8m3U1@mid.uni-berlin.de>
Message-ID: <4pBMl.21853$as4.605@nlpi069.nbdc.sbc.com>

On Thu 07 May 2009 09:09:53 AM EDT, Diez B. Roggisch wrote:
> Matthew Wilson wrote:
>> 
>> As of May 2009, what is the recommended way to run an external process
>> like grep and capture STDOUT and the error code?
>
> subprocess. Which becomes pretty clear when reading it's docs:

Yeah, that's what I figured, but I wondered if there was already
something newer and shinier aiming to bump subprocess off its throne.

I'll just stick with subprocess for now.  Thanks for the feedback!


From muhammadanushanif at gmail.com  Thu May  7 09:42:42 2009
From: muhammadanushanif at gmail.com (muhammadanushanif at gmail.com)
Date: Thu, 7 May 2009 06:42:42 -0700 (PDT)
Subject: Get Into The World Of YOUSUF JUSANI
Message-ID: <cd1da232-434a-45ba-9913-a7eb334f9dc4@h23g2000vbc.googlegroups.com>

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From matt at tplus1.com  Thu May  7 09:46:13 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Thu, 07 May 2009 13:46:13 GMT
Subject: How should I use grep from python?
References: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
	<mailman.5217.1241702763.11746.python-list@python.org>
Message-ID: <FCBMl.21855$as4.1221@nlpi069.nbdc.sbc.com>

On Thu 07 May 2009 09:25:52 AM EDT, Tim Chase wrote:
> While it doesn't use grep or external processes, I'd just do it 
> in pure Python:

Thanks for the code!

I'm reluctant to take that approach for a few reasons:

1. Writing tests for that code seems like a fairly large amount of work.
I think I'd need to to either mock out lots of stuff or create a bunch
of temporary directories and files for each test run.

I don't intend to test that grep works like it says it does.  I'll
just test that my code calls a mocked-out grep with the right options
and arguments, and that my code behaves nicely when my mocked-out
grep returns errors.

2. grep is crazy fast.  For a search through just a few files, I doubt
it would matter, but when searching through a thousand files (which is
likely) I suspect that an all-python approach might lag behind.  I'm
speculating here, though.

3. grep has lots and lots of cute options.  I don't want to think about
implementing stuff like --color, for example.  If I just pass all the
heavy lifting to grep, I'm already done.

On the other hand, your solution is platform-independent and has no
dependencies.  Mine depends on an external grep command.

Thanks again for the feedback!

Matt



From marco at sferacarta.com  Thu May  7 09:55:18 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Thu, 07 May 2009 15:55:18 +0200
Subject: How should I use grep from python?
In-Reply-To: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
References: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
Message-ID: <bLBMl.6969$Ux.2205@tornado.fastwebnet.it>

Matthew Wilson wrote:

> consensus.  I could os.popen, commands.getstatusoutput, the subprocess
> module, backticks, etc.

Backticks do_not_do what you think they do.

And with py3k they're also as dead as a dead parrot.




From dina.ali08 at googlemail.com  Thu May  7 10:02:00 2009
From: dina.ali08 at googlemail.com (Dina Ali)
Date: Thu, 7 May 2009 15:02:00 +0100
Subject: pyMPI error on mpi.barrier()
Message-ID: <4a031c930905070702x169d2141ibeadbae2853a64e4@mail.gmail.com>

Hello there

I am trying to paralleize GA code using pyMPI. part of the code and and the
error message is as below.
i write the new positions in a file by root (which is mpi.rank = 0) then
other processes are suppose to wait
until the written in the file finishes to start evaluating the objective.
the problem arises in the barrier method...
any ideas on how to do this would be very much appreciated..

Thanks very much
Dina

for i in xrange(max_iter):
            if (mpi.rank == 0):
                update_positions()
                save_pso_pops_iter()

            mpi.barrier()  <----------------------------error is here
            evaluate_objective()
            mpi.barrier()

error message:
    mpi.barrier()
mpi.MPIError: MPI_Error_string: invalid communicator: Input/output error
(pyMPI_comm_io.c:367)
-------------- next part --------------
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From debatem1 at gmail.com  Thu May  7 10:02:20 2009
From: debatem1 at gmail.com (CTO)
Date: Thu, 7 May 2009 07:02:20 -0700 (PDT)
Subject: [RELEASED] Python 3.1 beta 1
References: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com> 
	<mailman.5207.1241681372.11746.python-list@python.org>
	<_fKdncjfm5xjQZ_XnZ2dnUVZ_rSdnZ2d@pdx.net>
Message-ID: <6f0c942f-f393-454c-b921-8eb42c5ab18d@s16g2000vbp.googlegroups.com>

On May 7, 9:12?am, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> Daniel Fetchinson wrote:
> >> Other features include an ordered dictionary implementation
>
> > Are there plans for backporting this to python 2.x just as
> > multiprocessing has been?
>
> Why not grab the 3.1 code and do it yourself for your 2.X's?
> It should be far less work than attempting something as
> fidgety as multiprocessing.
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

If OrderedDict winds up being backported, will you include it
in 2.x?

Geremy Condra



From gnewsg at gmail.com  Thu May  7 10:03:16 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Thu, 7 May 2009 07:03:16 -0700 (PDT)
Subject: ANN: Python process utility (psutil) 0.1.2 released
Message-ID: <65f15b53-aacf-4651-a113-960cce25f205@p4g2000vba.googlegroups.com>

Hi,
I'm pleased to announce the 0.1.2 release of psutil:
http://code.google.com/p/psutil

=== About ===

psutil is a module providing an interface for retrieving information
on running processes and system utilization (CPU, memory) in a
portable way by using Python, implementing many functionalities
offered by tools like ps, top and Windows task manager.
It currently supports Linux, OS X, FreeBSD and Windows.

=== Enhancements ===

Aside from fixing some bugs psutil 0.1.2 includes the following major
enhancements:

 * per-process CPU user/kernel times
 * per-process create time
 * per-process CPU utilization percentage
 * per-process memory usage (bytes)
 * per-process memory utilization (percent)
 * total, used and free system physical/virtual memory

As of now psutil is released to the general public, and should be
considered a beta release implementing basic functionality.
With this third release we'd like to receive feedback from users and
suggestions for additional functionality.
Patches and volunteers to test/develop for additional platforms
welcome!

=== Links ===

* Home page: http://code.google.com/p/psutil
* Mailing list: http://groups.google.com/group/psutil/topics
* Source tarball: http://psutil.googlecode.com/files/psutil-0.1.2.tar.gz
* OS X installer: http://psutil.googlecode.com/files/psutil-0.1.2-py2.6-macosx10.4.dmg
* Windows Installer (Python 2.6): http://psutil.googlecode.com/files/psutil-0.1.2.win32-py2.6.exe
* Api Reference: http://code.google.com/p/psutil/wiki/Documentation

Thanks


--- Giampaolo Rodola'
http://code.google.com/p/pyftpdlib
http://code.google.com/p/psutil/


From suraj at barkale.com  Thu May  7 10:09:36 2009
From: suraj at barkale.com (Suraj Barkale)
Date: Thu, 7 May 2009 14:09:36 +0000 (UTC)
Subject: Parsing text
References: <37255869-6cc8-44c4-8b13-6376604df842@h23g2000vbc.googlegroups.com>
Message-ID: <loom.20090507T140449-363@post.gmane.org>

iainemsley <iainemsley <at> googlemail.com> writes:

> 
> Hi,
> I'm trying to write a fairly basic text parser to split up scenes and
> acts in plays to put them into XML. I've managed to get the text split
> into the blocks of scenes and acts and returned correctly but I'm
> trying to refine this and get the relevant scene number when the split
> is made but I keep getting an NoneType error trying to read the block
> inside the for loop and nothing is being returned. I'd be grateful for
> some suggestions as to how to get this working.
> 
> for scene in text.split('Scene'):
>     num = re.compile("^\s\[0-9, i{1,4}, v]", re.I)
>     textNum = num.match(scene)
>     if textNum:
>         print textNum
>     else:
>         print "No scene number"
>     m = '<div type="scene>'
>     m += scene
>     m += '<\div>'
>     print m
> 
> Thanks, Iain
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
> 

Are you trying to match Roman numerals? As others have said, it is difficult to
make any suggestions without knowing the input to your program.

You may want to look at PyParsing (http://pyparsing.wikispaces.com/) to parse
the text file without messing with regular expressions.

Regards,
Suraj



From aahz at pythoncraft.com  Thu May  7 10:29:46 2009
From: aahz at pythoncraft.com (Aahz)
Date: 7 May 2009 07:29:46 -0700
Subject: FLV download script works, but I want to enhance it
References: <mailman.5134.1241579669.11746.python-list@python.org>
Message-ID: <gtur8q$b2n$1@panix3.panix.com>

In article <mailman.5134.1241579669.11746.python-list at python.org>,
The Music Guy  <musicguy at alphaios.net> wrote:
>
>After I download the files, I usually want to convert them to another
>video format using command line tools, and I usually convert each one
>in a separate terminal since that way they can all be converted at the
>same time rather than one-by-one. Oddly enough, converting tends to
>take longer than downloading, but converting multiple files at once is
>faster than converting them one-by-one.

Here's my download script to get you started figuring this out, it does
the wget in the background so that several downloads can run in parallel
from a single terminal window:

#!/bin/bash

echo "Downloading $1"
wget "$1" > /dev/null 2>&1 &
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From nick at craig-wood.com  Thu May  7 10:30:11 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Thu, 07 May 2009 09:30:11 -0500
Subject: How should I use grep from python?
References: <eWAMl.21852$as4.3086@nlpi069.nbdc.sbc.com>
Message-ID: <slrnh05prp.cbq.nick@irishsea.home.craig-wood.com>

Matthew Wilson <matt at tplus1.com> wrote:
>  I'm writing a command-line application and I want to search through lots
>  of text files for a string.  Instead of writing the python code to do
>  this, I want to use grep.
> 
>  This is the command I want to run:
> 
>  $ grep -l foo dir
> 
>  In other words, I want to list all files in the directory dir that
>  contain the string "foo".
> 
>  I'm looking for the "one obvious way to do it" and instead I found no
>  consensus.  I could os.popen, commands.getstatusoutput, the subprocess
>  module, backticks, etc.  

backticks is some other language ;-)

>  As of May 2009, what is the recommended way to run an external process
>  like grep and capture STDOUT and the error code?

This is the one true way now-a-days

>>> from subprocess import Popen, PIPE
>>> p = Popen(["ls", "-l"], stdout=PIPE)
>>> for line in p.stdout:
...     print line
...
total 93332

-rw-r--r--  1 ncw ncw      181 2007-10-18 14:01 -

drwxr-xr-x  2 ncw ncw     4096 2007-08-29 22:56 10_files

-rw-r--r--  1 ncw ncw   124713 2007-08-29 22:56 10.html
[snip]
>>> p.wait() # returns the error code
0
>>>

There was talk of removing the other methods from public use for 3.x.
Not sure of the conclusion.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From hackingkk at gmail.com  Thu May  7 10:41:16 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Thu, 07 May 2009 20:11:16 +0530
Subject: Which python version do I use with "virtualenv"?
In-Reply-To: <c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
Message-ID: <1241707276.5822.3.camel@kk-laptop>

I have another question in this same context.
I have python 2.6 and want to set up a vertualenv
in /opt/turbogears/python2.5.
Then use this for all the things a turbogears based application would
need for project execution.

so I have decided that I will download python 2.5 and compile it
with ./configure --prefix=/opt/turbogears/python2.5 and then install
turbogears.  Is this possible?  will this kind of python compilation
help me to create a vertualenv in the place where I have python2.5?

or is there any other way to do this?  I really need vertualenv and
would want to use python2.5 because I feel easy install won't work with
python2.6

happy hacking.
Krishnakant.






From deets at nospam.web.de  Thu May  7 10:52:49 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 16:52:49 +0200
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
	<mailman.5221.1241707291.11746.python-list@python.org>
Message-ID: <76gaqtF1d8bv6U1@mid.uni-berlin.de>

Krishnakant wrote:

> I have another question in this same context.
> I have python 2.6 and want to set up a vertualenv
> in /opt/turbogears/python2.5.
> Then use this for all the things a turbogears based application would
> need for project execution.
> 
> so I have decided that I will download python 2.5 and compile it
> with ./configure --prefix=/opt/turbogears/python2.5 and then install
> turbogears.  Is this possible?  will this kind of python compilation
> help me to create a vertualenv in the place where I have python2.5?

You are confusing virtualenv with a custom-build python. You can of course
use VE with a custom-build python, but then there isn't as much use for it,
as you then have a distinct python-instance already - unless you are going
to share it amongst projects, which then leads to the question why you
don't use VE *without* the custom-build python.
 
> or is there any other way to do this?  I really need vertualenv and
> would want to use python2.5 because I feel easy install won't work with
> python2.6

Feelings are a fine thing in bed, on weddings or other social contexts.
Usually, they don't belong in the more mundane world of computers, and in
this case it's an outright wrong feeling. Easy_install works just fine with
py2.6

It might be though that there are some 3rd-party-libs that don't.

Diez


From hackingkk at gmail.com  Thu May  7 11:03:18 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Thu, 07 May 2009 20:33:18 +0530
Subject: Which python version do I use with "virtualenv"?
In-Reply-To: <76gaqtF1d8bv6U1@mid.uni-berlin.de>
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
	<mailman.5221.1241707291.11746.python-list@python.org>
	<76gaqtF1d8bv6U1@mid.uni-berlin.de>
Message-ID: <1241708598.5822.8.camel@kk-laptop>


> You are confusing virtualenv with a custom-build python. You can of course
> use VE with a custom-build python, but then there isn't as much use for it,
> as you then have a distinct python-instance already - unless you are going
> to share it amongst projects, which then leads to the question why you
> don't use VE *without* the custom-build python.
Well, Turbogears works perfectly with python2.5, although there are
people who use it with 2.6 as well.
I have to keep 2.6 because my screen reader orca giave me some problem
with 2.5.

So I have no option but to keep a seperate python2.5 in some different
directory and have ve use it.

would just like to know how I can get ve to use that installation and
not the one on my system by default.

happy hacking.
Krishnakant.
  





From deets at nospam.web.de  Thu May  7 11:18:52 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 17:18:52 +0200
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
	<mailman.5221.1241707291.11746.python-list@python.org>
	<76gaqtF1d8bv6U1@mid.uni-berlin.de>
	<mailman.5222.1241708608.11746.python-list@python.org>
Message-ID: <76gcboF1c6nm5U1@mid.uni-berlin.de>

Krishnakant wrote:

> 
>> You are confusing virtualenv with a custom-build python. You can of
>> course use VE with a custom-build python, but then there isn't as much
>> use for it, as you then have a distinct python-instance already - unless
>> you are going to share it amongst projects, which then leads to the
>> question why you don't use VE *without* the custom-build python.
> Well, Turbogears works perfectly with python2.5, although there are
> people who use it with 2.6 as well.
> I have to keep 2.6 because my screen reader orca giave me some problem
> with 2.5.
> 
> So I have no option but to keep a seperate python2.5 in some different
> directory and have ve use it.
> 
> would just like to know how I can get ve to use that installation and
> not the one on my system by default.

By *using* it? 

/opt/my_python/bin/python2.5

and you're done. If you e.g. download ez_setup.py & execute that through
your custom python, you'll end up with an easy_install
in /opt/my_python/bin, which you then can use to e.g. install VE.

Diez


From jamieson74 at gmail.com  Thu May  7 11:20:25 2009
From: jamieson74 at gmail.com (jamieson)
Date: Thu, 7 May 2009 08:20:25 -0700 (PDT)
Subject: tkinter and widget placement after resizing
Message-ID: <bfc1d96a-3ea3-4bd8-a06a-afb352e608c8@l5g2000vbc.googlegroups.com>

Hello,

I've got a fairly simple GUI that places pmw.EntryFields into a window
starting in the upper left corner.  When the first column is filled
with these widgets I'd like to start a new column and continue
placement, and so on.  It is working now with the grid manager if I
explicitly set the max number of widgets per column, but if I resize
the main window there is wasted space as the number of widgets per
column is fixed.  I'd like to find a design that could change the
number of widgets per column when the window is resized.  Any
suggestions?

i.e. start out with a window like this:

[1][4][7]
[2][5][8]
[3][6][9]


make the main window larger and end up with this:

[1][6]
[2][7]
[3][8]
[4][9]
[5]


From coldtortuga at gmail.com  Thu May  7 11:21:51 2009
From: coldtortuga at gmail.com (Francis Carr)
Date: Thu, 7 May 2009 08:21:51 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
Message-ID: <f23ebd9d-f445-4ebf-9b87-971d3ab295f6@p4g2000vba.googlegroups.com>

Scheme is arguably the programming language with the most support for
recursion, including the most complete support for tail-call
optimization, constructs like "letrec" to define collections of
multiply-recursive functions (which get used very frequently -- by no
means is it an uncommon situation, as you suggest in your initial
post), and hardly any iterative loops.  Yet -- scheme does not provide
out-of-the-box support for your proposed "let-a-function-implicitly-
refer-to-itself" idea.  This suggests that the idea itself runs
counter to more important aspects of a programming language.

In the special case of a self-recursive function, you would like re-
naming "to just work".  Out of morbid curiosity, I am compelled to
ask... why do you expect that re-naming anything --- a function, a
class, a module, a variable, anything --- in just one place but not
all the others should ever, under any circumstances, "just work" ?


From elwinter at verizon.net  Thu May  7 11:22:06 2009
From: elwinter at verizon.net (Eric Winter)
Date: Thu, 7 May 2009 08:22:06 -0700 (PDT)
Subject: Unable to build libpython2.5.so on OS X 10.4
Message-ID: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>

Hi all. I'm trying to build some internal code that needs to link
against libpython2.5.so on a OS X 10.4 (Tiger) machine. It seems that
no matter what combination of options and environment variables I give
to the configure script from python 2.5.1, all I get is the
libpython2.5.a (the static library). I've googled the problem and
searched the comp.lang.python archives, but I have been unable to find
anything that works.

Is there some special magic I have to invoke to do this? I've not done
any Mac development, so there may be some obvious point I am missing.
The Python README file and configure script comments are not getting
me very far.

TIA,
Eric Winter
NASA GSFC
Fermi Gamma-Ray Space Telescope Science Support Center


From navanjo at gmail.com  Thu May  7 11:34:46 2009
From: navanjo at gmail.com (Navanjo)
Date: Thu, 7 May 2009 08:34:46 -0700 (PDT)
Subject: P2P text chat engine
Message-ID: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>

If you have the source code of a p2p text chat engine please send to me


From tomf.sessile at gmail.com  Thu May  7 11:39:54 2009
From: tomf.sessile at gmail.com (TomF)
Date: Thu, 7 May 2009 08:39:54 -0700
Subject: Simple way of handling errors
References: <2009050616401916807-tomfsessile@gmailcom>
	<gtu4hj$ll7$00$1@news.t-online.com>
Message-ID: <2009050708395450073-tomfsessile@gmailcom>

On 2009-05-07 01:01:57 -0700, Peter Otten <__peter__ at web.de> said:

> TomF wrote:
> 
>> As a relative newcomer to Python, I like it a lot but I'm dismayed at
>> the difficulty of handling simple errors.  In Perl if you want to
>> anticipate a file-not-found error you can simply do:
>> 
>> open($file)  or die("open($file): $!");
>> 
>> and you get an intelligible error message.  In Python, to get the same
>> thing it appears you need at least:
>> 
>> try:
>> f=open(file)
>> except IOError, err:
>> print "open(%s): got %s" % (file, err.strerror)
>> exit(-1)
>> 
>> Is there a simpler interface or idiom for handling such errors?  I
>> appreciate that Python's exception handling is much more sophisticated
>> but often I don't need it.
>> 
>> -Tom
> 
> While you are making the transition you could write
> 
> from perl_idioms import open_or_die
> 
> f = open_or_die("does-not-exist")
> 
> 
> with the perl_idioms module looking like
> 
> import sys
> 
> def open_or_die(*args):
>     try:
>         return open(*args)
>     except IOError, e:
>         sys.exit(e)
> 
> Peter

Thanks.  Rolling my own error module for common errors may be the best 
way to go.

-Tom



From nickle at gmail.com  Thu May  7 11:45:06 2009
From: nickle at gmail.com (Nick)
Date: Thu, 7 May 2009 08:45:06 -0700 (PDT)
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
Message-ID: <fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>

On May 5, 8:27?pm, Tim Golden <m... at timgolden.me.uk> wrote:
> Nick wrote:
> > Part of the problem is that the 'selection' needs to be in a config
> > file. I can put the if row['status'] != 'Cancelled': return True into
> > a config, read it and eval it, but its not quite as clean as ansql
> > route.
>
> Still not clear what the restriction is. If you were writingSQLyou'd have to read *something* from your config file,
> unless you're suggesting that the "config file" is in fact
> aSQLfile. Which is one way of doing it, but then you might
> just as well have your config file as a Python file and
> import it.
>
> Have I missed the point somewhere here? Can you give an
> example -- even a fictional one -- of what you couldn't
> do using, say, the example I gave earlier?
>
> TJG

Solution found. In the end I used SQLite to read from a csv file, and
now I can query the CSV file. The file is read using the csv module

First create a function

def fraction(p, denom):
    num, frac = p.split ('-')
    return float (num) + float (frac) / denom

for use within queries.

Now build the class.

        self.filename  = filename
        self.dialect   = dialect
        self.query     = query
        reader = csv.reader (open (filename, 'r'))
        self.connection = sqlite.connect(":memory:")
        self.connection.create_function("fraction", 2, fraction) #
Adds in function
        self.cursor = self.connection.cursor()
        first = True
        for row in reader:
            if first:
                headers = []
                for r in row:
                    n = r.strip().replace (' ', '_').replace ('-','_')
                    headers.append (n)
                command = 'create table csv (%s)' % ','.join (headers)
                self.cursor.execute (command)
                first = False
            else:
                command = 'insert into csv values ("%s")' % '","'.join
(row)
                self.cursor.execute (command)

and then I can use this

        self.cursor.execute (self.query)
        rows = self.cursor.fetchall()
        headers = []
        for r in self.cursor.description:
            headers.append (r[0])
        results = Results.Results (headers, self.name, {})
        i = 0
        for row in rows:
            results.add (row, i)
            i = i + 1
        return results

to query the results.

Results.Results is one of my classes that's reused in lots of places.

The query then looks somethign like this

                select
                    Client_Reference_Number as TrdNbr,
                    Asset_Number as ISIN,
                    Quantity as Qty,
                    status
                from
                    csv
                where status in ("CANCELLED")

                union

                select
                    Client_Reference_Number as TrdNbr,
                    Asset_Number as ISIN,
                    Quantity as Qty,
                    status
                from
                    csv
                where status not in ("CANCELLED")


All incredibly neat and the first time I've used SQLite.

nick


From lists at cheimes.de  Thu May  7 11:45:51 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 07 May 2009 17:45:51 +0200
Subject: Unable to build libpython2.5.so on OS X 10.4
In-Reply-To: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
References: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
Message-ID: <4A03022F.408@cheimes.de>

Eric Winter schrieb:
> Hi all. I'm trying to build some internal code that needs to link
> against libpython2.5.so on a OS X 10.4 (Tiger) machine. It seems that
> no matter what combination of options and environment variables I give
> to the configure script from python 2.5.1, all I get is the
> libpython2.5.a (the static library). I've googled the problem and
> searched the comp.lang.python archives, but I have been unable to find
> anything that works.
> 
> Is there some special magic I have to invoke to do this? I've not done
> any Mac development, so there may be some obvious point I am missing.
> The Python README file and configure script comments are not getting
> me very far.

You have to start with a clean plate and use the --enable-shared option
to configure:

make distclean
./configure --enable-unicode=ucs4 --enable-shared
make

That will give you a libpython2.5.dylib. The suffix for shared libraries
is .dylib on On Mac OS X, not .so!

Christian


From Scott.Daniels at Acm.Org  Thu May  7 11:53:30 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 07 May 2009 08:53:30 -0700
Subject: [RELEASED] Python 3.1 beta 1
In-Reply-To: <6f0c942f-f393-454c-b921-8eb42c5ab18d@s16g2000vbp.googlegroups.com>
References: <1afaf6160905061832xfc295e3y881c7c8e81083ee6@mail.gmail.com>
	<mailman.5207.1241681372.11746.python-list@python.org>
	<_fKdncjfm5xjQZ_XnZ2dnUVZ_rSdnZ2d@pdx.net>
	<6f0c942f-f393-454c-b921-8eb42c5ab18d@s16g2000vbp.googlegroups.com>
Message-ID: <Qpqdnc-arrFXn57XnZ2dnUVZ_qCdnZ2d@pdx.net>

CTO wrote:
> ...
> If OrderedDict winds up being backported, will you include it
> in 2.x?

I see it in the 2.7 sources.

--Scott David Daniels
Scott.Daniels at Acm.Org


From elwinter at verizon.net  Thu May  7 11:56:50 2009
From: elwinter at verizon.net (elwinter)
Date: Thu, 7 May 2009 08:56:50 -0700 (PDT)
Subject: Unable to build libpython2.5.so on OS X 10.4
References: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
	<mailman.5223.1241711153.11746.python-list@python.org>
Message-ID: <73cd15ab-1aed-494f-b8a6-7d9c3a275ef7@o27g2000vbd.googlegroups.com>

Christian,

Thanks for the response. I knew about the .dylib suffix, but that's
not being built either, even when I supply the --enable-shared option
to configure. I also tried the --enable-unicode configure option, but
no joy. Might there be some additional OS X package I need to install
to get this to work?

Thanks,
Eric

On May 7, 11:45?am, Christian Heimes <li... at cheimes.de> wrote:
> Eric Winter schrieb:
>
> > Hi all. I'm trying to build some internal code that needs to link
> > against libpython2.5.so on a OS X 10.4 (Tiger) machine. It seems that
> > no matter what combination of options and environment variables I give
> > to the configure script from python 2.5.1, all I get is the
> > libpython2.5.a (the static library). I've googled the problem and
> > searched the comp.lang.python archives, but I have been unable to find
> > anything that works.
>
> > Is there some special magic I have to invoke to do this? I've not done
> > any Mac development, so there may be some obvious point I am missing.
> > The Python README file and configure script comments are not getting
> > me very far.
>
> You have to start with a clean plate and use the --enable-shared option
> to configure:
>
> make distclean
> ./configure --enable-unicode=ucs4 --enable-shared
> make
>
> That will give you a libpython2.5.dylib. The suffix for shared libraries
> is .dylib on On Mac OS X, not .so!
>
> Christian



From bearophileHUGS at lycos.com  Thu May  7 11:57:22 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 7 May 2009 08:57:22 -0700 (PDT)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org>
Message-ID: <7c96bd34-b199-4646-a790-4097adcc6999@q14g2000vbn.googlegroups.com>

I appreciate the tables "Infinite Iterators" and "Iterators
terminating on the shortest input sequence" at the top of the
itertools module, they are quite handy. I'd like to see similar
summary tables at the top of other docs pages too (such pages are
often quite long), for example the collections docs page.


collections.Counter and collections.OrderedDict: very nice and useful.
Is the order inside OrderedDict kept with a double linked list of the
items?


Counter.most_common([n]): a good idea.


If I need a dictionary that is both ordered and has a default too I
can't combine their qualities (but I can use the __missing__(key)
hook).


>Equality tests between OrderedDict objects are order-sensitive and are implemented as list(od1.items())==list(od2.items()). Equality tests between OrderedDict objects and other Mapping objects are order-insensitive<

very nice idea.


>The OrderedDict constructor and update() method both accept keyword arguments, but their order is lost because Python's function call semantics pass-in keyword arguments using a regular unordered dictionary.<

This is unfortunate :-(
Well, I'd like function call semantics pass-in keyword arguments to
use OrderedDicts then... :-)


>Several mathematical operations are provided for combining Counter objects to produce multisets<

Very nice.


itertools.count(): when increments are non-integer I hope the results
are computed with a multiplication instead an interated sum, to
increase precision.


Issue 4688 and the work by Antoine Pitrou: interesting GC
optimization. The performance difference of the BinaryTrees benchmark
is big.

Bye,
bearophile


From bearophileHUGS at lycos.com  Thu May  7 12:07:58 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 7 May 2009 09:07:58 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<f23ebd9d-f445-4ebf-9b87-971d3ab295f6@p4g2000vba.googlegroups.com>
Message-ID: <26f0fa28-f3d9-4549-a748-51dc00827b1d@r3g2000vbp.googlegroups.com>

Francis Carr:

I don't know who are you talking to, but I can give you few answers
anyway.

>collections of multiply-recursive functions (which get used very frequently -- by no means is it an uncommon situation, as you suggest in your initial post),<

They may be frequent in Scheme (because it's often used as an almost
pure language), but in Python code they are quite rare. I have used
two mutual recursive functions only once in non-toy Python code in two
or more years.



>Yet -- scheme does not provide out-of-the-box support for your proposed "let-a-function-implicitly- refer-to-itself" idea.  This suggests that the idea itself runs counter to more important aspects of a programming language.<

I see. It's not a very implicit thing, because you have to call a
function anyway, it's just it has a fixed name, like __func__.
I think it doesn't runs counter to Python & D languages (I have asked
for a similar feature in D2 too, and the designers seem to have
accepted the idea, already suggested there by another person in the
past).

Bye,
bearophile


From Florian.Wollenschein at FernUni-Hagen.de  Thu May  7 12:22:22 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Thu, 07 May 2009 18:22:22 +0200
Subject: hex(dummy)[2:] - issue...
In-Reply-To: <mailman.5196.1241663376.11746.python-list@python.org>
References: <gtsigt$31m$1@news-cedar.fernuni-hagen.de>
	<mailman.5196.1241663376.11746.python-list@python.org>
Message-ID: <gtv1ru$c01$1@news-cedar.fernuni-hagen.de>

Tim Chase wrote:
>> I need some advice :-)
>> I'm using hex(dummy)[2:] to represent a color in hexadecimal format 
>> for the bgcolor in an html file. dummy is the color value in RGB of 
>> course...
>>
>> Now, if there's an R, G or B value of zero, this command only prints 
>> one single 0 instead of two. What's wrong with the code?
> 
> You can try
> 
>  PLACES = 2 # 6?
>  hex(dummy)[2:].zfill(PLACES)
> 
> Alternatively, you can output decimal numbers in HTML/CSS with
> 
>   rgb(r, g, b)
> 
> such as
> 
>   style="rgb(255,0,0)"
> 
> However, I recommend doing this via CSS unless you have a strong reason 
> to sully your HTML with style information.
> 
> -tkc
> 
> 
> 
> 
> 
> 
> 

hey tkc,

I used your first alternative. This did it! Thanks a lot.
I think I will write the style stuff into a .css file in the next few 
days but until then I'm just working on get my program to work...

Listick
http://www.listick.org


From mnordhoff at mattnordhoff.com  Thu May  7 12:24:54 2009
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Thu, 07 May 2009 16:24:54 +0000
Subject: Simple way of handling errors
In-Reply-To: <pan.2009.05.07.03.38.21@REMOVE.THIS.cybersource.com.au>
References: <2009050616401916807-tomfsessile@gmailcom>	<pan.2009.05.07.02.41.28@REMOVE.THIS.cybersource.com.au>	<2009050620213875249-tomfsessile@gmailcom>
	<pan.2009.05.07.03.38.21@REMOVE.THIS.cybersource.com.au>
Message-ID: <4A030B56.5000503@mattnordhoff.com>

Steven D'Aprano wrote:
> On Wed, 06 May 2009 20:21:38 -0700, TomF wrote:
> 
>>> The only reason you would bother going to the time and effort of
>>> catching the error, printing your own error message, and then exiting,
>>> is if you explicitly want to hide the traceback from the user.
>> Well, to me, exposing the user to such raw backtraces is unprofessional,
>> which is why I try to catch user-caused errors.  But I suppose I have an
>> answer to my question.
> 
> That depends on your audience. Not every program is written to be used 
> for a technical incompetent audience. Some users actually *want* to see 
> the errors.
> 
> But certainly there are large classes of applications where you do want 
> to suppress the traceback. That's why I said "if you explicitly want to 
> hide the traceback from the user" rather than "don't do this".
> 
> The idiom I use is to wrap the *entire* application in a single 
> try...except block, and then put all your user-friendly error handling in 
> one place, instead of scattered over the entire application:
> 
> 
> try:
>     main(sys.argv[1:])
> except KeyboardInterrupt, SystemExit:

That should be:

except (KeyboardInterrupt, SystemExit):

;-D

>     raise
> except Exception, e:
>     log(e)
>     print >>sys.stderr, str(e)
>     sys.exit(1)
> 
> 
> 
> Hope this helps.
-- 


From Florian.Wollenschein at FernUni-Hagen.de  Thu May  7 12:32:03 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Thu, 07 May 2009 18:32:03 +0200
Subject: What would YOU like to see in a txt to html converter?
Message-ID: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>

As you might have mentioned I'm just working on a txt to html converter 
called "thc". This project is intended for me to learn Python and now 
pyQT4 to which I changed a few days ago (started with Tkinter).

I have implemented the following features so far:

- Giving a title for the html
- Choose whether it's Transitional or Strict Doctype
- Select a background color
- Show the converted file with the standard browser
- Working on a font size slider

I don't really know if this is of any use for anybody but it's just a 
fun project by a beginner :-)

Now I'd like to know what kind of features you'd like to see in version 
0.3 of thc!?

Please post them...

Have fun!
Listick
http://www.lictick.org


From nad at acm.org  Thu May  7 12:41:42 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 07 May 2009 12:41:42 -0400
Subject: Unable to build libpython2.5.so on OS X 10.4
References: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
Message-ID: <nad-10D4AF.12414207052009@ger.gmane.org>

In article 
<fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb at g20g2000vba.googlegroups.com>,
 Eric Winter <elwinter at verizon.net> wrote:
> Hi all. I'm trying to build some internal code that needs to link
> against libpython2.5.so on a OS X 10.4 (Tiger) machine. It seems that
> no matter what combination of options and environment variables I give
> to the configure script from python 2.5.1, all I get is the
> libpython2.5.a (the static library). I've googled the problem and
> searched the comp.lang.python archives, but I have been unable to find
> anything that works.

Perhaps I misunderstand, but if you are trying to build a C extension 
for an existing Python 2.5 installation, using Distutils from that 
installation should take care of everything for you.  Is there a 
setup.py file by any chance?  Are you using a standard python 
installation (i.e. python.org installer for instance)?  More details 
might help.

-- 
 Ned Deily,
 nad at acm.org



From apt.shansen at gmail.com  Thu May  7 12:46:11 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 7 May 2009 09:46:11 -0700
Subject: Logging exceptions to a file
In-Reply-To: <01129a12-312c-4cb9-a0f4-5a456bd9eb6a@e24g2000vbe.googlegroups.com>
References: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>
	<WUxMl.9292$y61.2903@news-server.bigpond.net.au>
	<01129a12-312c-4cb9-a0f4-5a456bd9eb6a@e24g2000vbe.googlegroups.com>
Message-ID: <7a9c25c20905070946w78822390n1ff2915663f6260@mail.gmail.com>

>
>
>  > > So far so good, but I'd like to record (possibly unhandled) exceptions
> > > in the logfile.
> > > * Do I need to explicitly trap every single exception ?
> > > * In that case, won't I get 2 log messages on the console (as
> > > illustrated in the code below:
>

Check out sys.excepthook, something vaguely like:

import sys

def handle_exceptions(exctype, value, traceback):     logging.exception("An
unhandled exception was detected.")

sys.excepthook = handle_exceptions
-------------- next part --------------
An HTML attachment was scrubbed...
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From arnodel at googlemail.com  Thu May  7 12:55:11 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Thu, 07 May 2009 17:55:11 +0100
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
	<op.uti1kf0ga8ncjz@gnudebst> <1241649200.4a0210301f77e@mail.uh.cu>
	<mailman.5189.1241657949.11746.python-list@python.org>
	<pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>
	<mailman.5200.1241663550.11746.python-list@python.org>
Message-ID: <m27i0srgy8.fsf@googlemail.com>

Luis Alberto Zarrabeitia Gomez <kyrie at uh.cu> writes:

> A bit offtopic: a while ago I think I saw a recipe for a decorator
> that, via bytecode hacks, would bind otherwise global names to the
> local namespace of the function. Can anyone remember it/point me to
> it? An @bind decorator that would 'localize' all the global names,
> including the still unexistent but already know function name, would
> guarantee that at least recursion calls the same function instead of
> "whatever happens to be bound to their name at runtime". If it wasn't
> a hack, anyway.

I remember a discussion on python-ideas, and I wrote this decorator at
the time:


def new_closure(vals):
    args = ','.join('x%i' % i for i in range(len(vals)))
    f = eval("lambda %s:lambda:(%s)" % (args, args))
    return f(*vals).func_closure

def localize(f):
    f_globals = dict((n, f.func_globals[n]) for n in f.func_code.co_names)
    f_closure = ( f.func_closure and
                  new_closure([c.cell_contents for c in f.func_closure]) )
    return type(f)(f.func_code, f_globals, f.func_name,
                   f.func_defaults, f_closure)


Unfortunately it fails for recursive functions:


>>> @localize
... def fac(n):
...     return 1 if n <= 1 else n*fac(n - 1)
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "localize.py", line 7, in localize
    f_globals = dict((n, f.func_globals[n]) for n in f.func_code.co_names)
  File "localize.py", line 7, in <genexpr>
    f_globals = dict((n, f.func_globals[n]) for n in f.func_code.co_names)
KeyError: 'fac'


It can be fixed, but not very easily precisely because the function is
recursive.  I've hacked a quick way to do it below.


def reclocalize(f):
    def wrapper(*args, **kwargs):
        return recf(*args, **kwargs)
    def getglobal(name):
        return wrapper if name == f.__name__ else f.func_globals[name]
    f_globals = dict((n, getglobal(n)) for n in f.func_code.co_names)
    f_closure = ( f.func_closure and
                  new_closure([c.cell_contents for c in f.func_closure]) )
    recf = type(f)(f.func_code, f_globals, f.func_name,
                   f.func_defaults, f_closure)
    return wrapper


Now it works as intended:


>>> @reclocalize
... def fac(n):
...     return 1 if n <= 1 else n*fac(n - 1)
... 
>>> fac(10)
3628800
>>> foo = fac
>>> del fac
>>> foo(10)
3628800

-- 
Arnaud


From segfaulthunter at gmail.com  Thu May  7 12:56:16 2009
From: segfaulthunter at gmail.com (segfaulthunter)
Date: Thu, 7 May 2009 09:56:16 -0700 (PDT)
Subject: Logging exceptions to a file
References: <597627b8-d30b-4b74-9202-9cd46fb1d129@s28g2000vbp.googlegroups.com>
	<WUxMl.9292$y61.2903@news-server.bigpond.net.au>
	<01129a12-312c-4cb9-a0f4-5a456bd9eb6a@e24g2000vbe.googlegroups.com>
Message-ID: <5a779db4-9dd3-4b85-bda2-12bea38a1026@o27g2000vbd.googlegroups.com>

On May 7, 1:19?pm, Pierre GM <pierregmc... at gmail.com> wrote:
> On May 7, 5:32?am, Lie Ryan <lie.1... at gmail.com> wrote:
>
>
>
> > Pierre GM wrote:
> > > All,
> > > I need to log messages to both the console and a given file. I use the
> > > following code (on Python 2.5)
>
> > >>>> import logging
> > >>>> #
> > >>>> logging.basicConfig(level=logging.DEBUG,)
> > >>>> logfile = logging.FileHandler('log.log')
> > >>>> logfile.setLevel(level=logging.INFO)
> > >>>> logging.getLogger('').addHandler(logfile)
> > >>>> #
> > >>>> mylogger = logging.getLogger('mylogger')
> > >>>> #
> > >>>> mylogger.info("an info message")
>
> > > So far so good, but I'd like to record (possibly unhandled) exceptions
> > > in the logfile.
> > > * Do I need to explicitly trap every single exception ?
> > > * In that case, won't I get 2 log messages on the console (as
> > > illustrated in the code below:
> > >>>> try:
> > >>>> ? ? 1/0
> > >>>> except ZeroDivisionError:
> > >>>> ? ? mylogger.exception(":(")
> > >>>> ? ? raise
>
> > > Any comments/idea welcomed
> > > Cheers.
>
> > Although it is usually not recommended to use a catch-all except, this
> > is the case where it might be useful. JUST DON'T FORGET TO RE-RAISE THE
> > EXCEPTION.
>
> > if __name__ == '__main__':
> > ? ? ?try:
> > ? ? ? ? ?main():
> > ? ? ?except Exception, e:
> > ? ? ? ? ?# log('Unhandled Exception', e)
> > ? ? ? ? ?raise
>
> OK for a simple script, but the (unhandled) exceptions need to be
> caught at the module level. Any idea?

Override sys.excepthook. http://docs.python.org/library/sys.html#sys.excepthook


From elwinter at verizon.net  Thu May  7 12:57:09 2009
From: elwinter at verizon.net (elwinter)
Date: Thu, 7 May 2009 09:57:09 -0700 (PDT)
Subject: Unable to build libpython2.5.so on OS X 10.4
References: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
	<mailman.5224.1241714518.11746.python-list@python.org>
Message-ID: <0e05eca2-b460-4e01-aa54-cc1055f51e7d@q14g2000vbn.googlegroups.com>

Hi Ned. The Python module I am building is actually the Python module
for ROOT, a large package from CERN. However, the problem arises
before that code enters the picture, when I am building Python itself.
All I want to do is create "libpython2.5.dylib", or its equivalent,
and I can't seem to make that happen on Tiger.

Thanks,
Eric

On May 7, 12:41?pm, Ned Deily <n... at acm.org> wrote:
> In article
> <fde3b1d5-8a52-4ff1-9093-9ed470b4f... at g20g2000vba.googlegroups.com>,
> ?Eric Winter <elwin... at verizon.net> wrote:
>
> > Hi all. I'm trying to build some internal code that needs to link
> > against libpython2.5.so on a OS X 10.4 (Tiger) machine. It seems that
> > no matter what combination of options and environment variables I give
> > to the configure script from python 2.5.1, all I get is the
> > libpython2.5.a (the static library). I've googled the problem and
> > searched the comp.lang.python archives, but I have been unable to find
> > anything that works.
>
> Perhaps I misunderstand, but if you are trying to build a C extension
> for an existing Python 2.5 installation, using Distutils from that
> installation should take care of everything for you. ?Is there a
> setup.py file by any chance? ?Are you using a standard python
> installation (i.e. python.org installer for instance)? ?More details
> might help.
>
> --
> ?Ned Deily,
> ?n... at acm.org



From lhanser at gmail.com  Thu May  7 13:24:08 2009
From: lhanser at gmail.com (Lawrence Hanser)
Date: Thu, 7 May 2009 10:24:08 -0700
Subject: Wing vs Netbeans IDE?
Message-ID: <f95c22480905071024u24873e41id1f0b9b11e9592ac@mail.gmail.com>

Dear Colleagues,

I have been using NetBeans for a month or so now and am reasonably
happy with it.  I'm considering other options, and ran across Wing.
I'm interested in opinions about NetBeans and Wing as IDE for Python.

Thanks,

Larry


From james at agentultra.com  Thu May  7 13:28:10 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 07 May 2009 13:28:10 -0400
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5109.1241543371.11746.python-list@python.org>
	<85d4am8hq4.fsf@agentultra.com>
	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
Message-ID: <8563gcx1p1.fsf@agentultra.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:

> On Wed, 06 May 2009 09:48:51 -0400, J Kenneth King wrote:
>
>> Emile van Sebille <emile at fenx.com> writes:
>> 
>>> On 5/5/2009 9:15 AM J Kenneth King said...
>>>
>>>> List comprehensions can make a reader of your code apprehensive
>>>> because it can read like a run-on sentence and thus be difficult to
>>>> parse. The Python documentation discourages their use and I believe
>>>> for good reason.
>>>
>>> Can you provide a link for this?  I'd like to see specifically what's
>>> being discouraged, as I'd be surprised to find routine usage frowned
>>> upon.
>>>
>>> Emile
>> 
>> http://docs.python.org/tutorial/datastructures.html#nested-list-
> comprehensions
>> 
>> 
>> "If you?ve got the stomach for it, list comprehensions can be nested.
>> They are a powerful tool but ? like all powerful tools ? they need to be
>> used carefully, if at all."
>
> How does this discourage the use of list comprehensions? At most, it 
> warns that complicated list comps are tricky. Complicated *anything* are 
> tricky.

They are tricky and need to be used carefully, *if at all*.

IMO this means that if there's a way to do it without a nested list
comprehension, then that solution should be preferred.

>> and
>> 
>> "In real world, you should prefer builtin functions to complex flow
>> statements."
>
> That's ridiculous. The example given is a special case. That's like 
> saying "Loops are hard, so in the real world, if you want a loop, find a 
> builtin function that does what you want instead."
>
> What's the "builtin function" we're supposed to prefer over a "complex 
> flow statement" like this?

It's not ridiculous and says nothing of the sort.  You're jumping to
conclusions.  If you have a problem with it, I suggest you complain to
the Python documentation people.  I don't make this stuff up.

Just look at many of the example solutions provided in this thread to
the OP's problem. The examples in the link I provided are also good as
are ones provided in the itertools documentation.

Keep in mind that nested comprehensions are still available because
they do have a use case that justifies their existence. However, I
think the Python documentation warns against their use because people
might rely on them for problems where they aren't necessary and since
they are difficult to read... it can lead to difficult to read code.


From version5 at gmail.com  Thu May  7 13:30:18 2009
From: version5 at gmail.com (nnp)
Date: Thu, 7 May 2009 18:30:18 +0100
Subject: Wing vs Netbeans IDE?
In-Reply-To: <f95c22480905071024u24873e41id1f0b9b11e9592ac@mail.gmail.com>
References: <f95c22480905071024u24873e41id1f0b9b11e9592ac@mail.gmail.com>
Message-ID: <28749c0e0905071030p15540b99nc73b37edb72bbe9a@mail.gmail.com>

I've tried Wing but not NetBeans. I would personally recommend Eclipse
with the PyDev plugin. I prefer it to Wing by *far* and if you prefer
Eclipse to NetBeans for Java then it might be worth your while
checking it out. If you take a few minutes to learn a few of the
shortcuts in Eclipse you can really cut down the time to do a lot of
administrative/organisational tasks.

On Windows I remember Eclipse + Pydev being a bit of a memory hog but
on OS X and Linux it works smoothly.

On Thu, May 7, 2009 at 6:24 PM, Lawrence Hanser <lhanser at gmail.com> wrote:
> Dear Colleagues,
>
> I have been using NetBeans for a month or so now and am reasonably
> happy with it. ?I'm considering other options, and ran across Wing.
> I'm interested in opinions about NetBeans and Wing as IDE for Python.
>
> Thanks,
>
> Larry
> --
> http://mail.python.org/mailman/listinfo/python-list
>

-- 
http://www.unprotectedhex.com
http://www.smashthestack.org


From dotancohen at gmail.com  Thu May  7 13:35:02 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Thu, 7 May 2009 20:35:02 +0300
Subject: What would YOU like to see in a txt to html converter?
In-Reply-To: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
Message-ID: <880dece00905071035v7d7749fbj6e0ccd9907b813c8@mail.gmail.com>

> As you might have mentioned I'm just working on a txt to html converter
> called "thc". This project is intended for me to learn Python and now pyQT4
> to which I changed a few days ago (started with Tkinter).
>
> I have implemented the following features so far:
>
> - Giving a title for the html
> - Choose whether it's Transitional or Strict Doctype

Don't give this choice. What benefit does this give the user?

> - Select a background color
> - Show the converted file with the standard browser

That should probably be valid [X]HTML and be done with it.

> - Working on a font size slider

This should be a browser feature, not a page feature. Use the default
sizes of the HTML elements, and let the UA override those defaults as
the user sees fit ot configure it.

If you think that there should be a font size slider, then file a
feature request at the bug tracker of your favourite browser.

> I don't really know if this is of any use for anybody but it's just a fun
> project by a beginner :-)
>
> Now I'd like to know what kind of features you'd like to see in version 0.3
> of thc!?
>

You should probably convert the text to UTF-8 and make sure to declare
that with a meta tag.

You might want to look at markdown for a nice way to have hyperlink support.

Lists conversion, like these:
* item one
* item two
* item three

1. item one
2. item two
3. item three

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il


From nad at acm.org  Thu May  7 13:36:49 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 07 May 2009 13:36:49 -0400
Subject: Unable to build libpython2.5.so on OS X 10.4
References: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
	<mailman.5224.1241714518.11746.python-list@python.org>
	<0e05eca2-b460-4e01-aa54-cc1055f51e7d@q14g2000vbn.googlegroups.com>
Message-ID: <nad-3204F9.13364907052009@ger.gmane.org>

In article 
<0e05eca2-b460-4e01-aa54-cc1055f51e7d at q14g2000vbn.googlegroups.com>,
 elwinter <elwinter at verizon.net> wrote:
> The Python module I am building is actually the Python module
> for ROOT, a large package from CERN. However, the problem arises
> before that code enters the picture, when I am building Python itself.
> All I want to do is create "libpython2.5.dylib", or its equivalent,
> and I can't seem to make that happen on Tiger.

Any chance you can use the python.org installer for 2.5.4?  Or the 
Macports version?  They both are supported on Tiger.

<http://www.python.org/download/releases/2.5.4/>
<http://www.macports.org/>

Again, I may be missing something but libpythonx.x by itself is not very 
useful, i.e. it's not your usual standalone lib.  You'll almost 
certainly need the whole python installation.  There are a number of 
ways to build python on OS X (google will find them or ask on the Mac 
python sig) but, unless you have some special requirement, use an 
existing python installation and build the ROOT Python module with that.

-- 
 Ned Deily,
 nad at acm.org



From bjracine at glosten.com  Thu May  7 13:49:04 2009
From: bjracine at glosten.com (Benjamin J. Racine)
Date: Thu, 7 May 2009 10:49:04 -0700
Subject: Wing vs Netbeans IDE?
In-Reply-To: <f95c22480905071024u24873e41id1f0b9b11e9592ac@mail.gmail.com>
Message-ID: <B5B90D0DBF4EDC46892E8FD3602BA92A17842758@clipper.glosten.local>

I'd love to see an updated shootout between these three, as I cannot for the life of me seem to be able to settle down with one of them.

Things I don't like: 
Wing's lack of integrated mercurial/svn support.
The clunkiness and scattered plugin approach of Eclipse (the latter is relavent when starting work on new machines all the time).
Netbeans project browser doesn't show class or functions inside the files.
Netbeans autocompletion doesn't seem immediately impressive.

But...
Wing has mentioned future support of svn,git,bazaar,mercurial,etc in the future.
QT designer is integrated with Eclipse.  So is Photran, which is convenient for some of science types.
It seems that there are reasons to be optimistic about the future of netbeans.  It seems to be well put together so far, but the least mature.

I know that this comes up time and again, but I think a feature-specific debate over these might be worth revisiting for a lot of newcomers.

Ben Racine 

From donovan.parks at gmail.com  Thu May  7 14:07:33 2009
From: donovan.parks at gmail.com (Donovan Parks)
Date: Thu, 7 May 2009 15:07:33 -0300
Subject: Updating an Imported Function
Message-ID: <8fd818a30905071107h21c2eff7uad5aa177a84ff21b@mail.gmail.com>

Hello,

I'm new to Python and have what is probably a very basic question. I
am writing a helloWorld() function within a file called helloWorld.py:

def helloWorld():
	print 'hi'

Now, I can import and run this function:

import helloWorld
helloWorld.helloWorld()

Which will print 'hi' as expected. Now, I'd like to update this
function in my text editor so it is:

def helloWorld():
	print 'hello world'

Without having to exit my Python interpreter, how can I import this
revised function? If I do the import again:

import helloWorld

And run helloWorld.helloWorld() it will still print out just 'hi'.
I've tried deleting this function (a weird concept to me as I come
from a C++ background) using del helloWorld and than importing again,
but the function will still print out just 'hi'.

Can this be done? How so?

Thanks for any and all help.

Cheers,
Donovan


From norseman at hughes.net  Thu May  7 14:13:27 2009
From: norseman at hughes.net (norseman)
Date: Thu, 07 May 2009 11:13:27 -0700
Subject: What would YOU like to see in a txt to html converter?
In-Reply-To: <880dece00905071035v7d7749fbj6e0ccd9907b813c8@mail.gmail.com>
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
	<880dece00905071035v7d7749fbj6e0ccd9907b813c8@mail.gmail.com>
Message-ID: <4A0324C7.9090708@hughes.net>

Dotan Cohen wrote:
>> As you might have mentioned I'm just working on a txt to html converter
>> called "thc". This project is intended for me to learn Python and now pyQT4
>> to which I changed a few days ago (started with Tkinter).
>>
>> I have implemented the following features so far:
>>
>> - Giving a title for the html
>> - Choose whether it's Transitional or Strict Doctype
> 
> Don't give this choice. What benefit does this give the user?
> 
>> - Select a background color
>> - Show the converted file with the standard browser
> 
> That should probably be valid [X]HTML and be done with it.
> 
>> - Working on a font size slider
> 
> This should be a browser feature, not a page feature. Use the default
> sizes of the HTML elements, and let the UA override those defaults as
> the user sees fit ot configure it.
> 
> If you think that there should be a font size slider, then file a
> feature request at the bug tracker of your favourite browser.
> 
>> I don't really know if this is of any use for anybody but it's just a fun
>> project by a beginner :-)
>>
>> Now I'd like to know what kind of features you'd like to see in version 0.3
>> of thc!?
>>
> 
> You should probably convert the text to UTF-8 and make sure to declare
> that with a meta tag.
> 
> You might want to look at markdown for a nice way to have hyperlink support.
> 
> Lists conversion, like these:
> * item one
> * item two
> * item three
> 
> 1. item one
> 2. item two
> 3. item three
> 
================================
Actually I would like to see a good HTML to txt or odt converter. 
Perhaps someone you know has the time and inclination to make one.
In Unix, grep is a fantastic search tool.  Since HTML's today seem to be 
one page one file, trying to search a "help collection" for a phrase is 
useless in the practical sense.

I mean no offense to your effort. There are many who wish a good version 
of such a converter.  It's just that I personally wish HTMLs used for 
Help and Documentation were banned from the universe. To me, a well 
written, easily understood, no frills, fully grep'able text file that 
covers the subject well is a truly fantastic thing to be well cherished.


Steve


From allenreas at gmail.com  Thu May  7 14:19:36 2009
From: allenreas at gmail.com (AllenLars)
Date: Thu, 7 May 2009 11:19:36 -0700 (PDT)
Subject: Downloading most recently modified files
Message-ID: <23432457.post@talk.nabble.com>


I am trying to code a script that will allow me to go to ftp site and
download files based on most recently modified file (date, time).  I am
brand new to programming.  Any and all help is appreciated.
-- 
View this message in context: http://www.nabble.com/Downloading-most-recently-modified-files-tp23432457p23432457.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From cnbrat.at.gmail at dot.com.no.spam  Thu May  7 14:22:57 2009
From: cnbrat.at.gmail at dot.com.no.spam (Will Wang)
Date: Fri, 08 May 2009 02:22:57 +0800
Subject: What would YOU like to see in a txt to html converter?
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
Message-ID: <87my9okc1q.fsf@lakeside.sjtu.edu.cn>

>>>>> "Florian" == Florian Wollenschein <Florian.Wollenschein at FernUni-Hagen.de> writes:

    Florian> As you might have mentioned I'm just working on a txt to html converter called
    Florian> "thc". This project is intended for me to learn Python and now pyQT4 to which I
    Florian> changed a few days ago (started with Tkinter).

    Florian> I have implemented the following features so far:

    Florian> - Giving a title for the html
    Florian> - Choose whether it's Transitional or Strict Doctype
    Florian> - Select a background color
    Florian> - Show the converted file with the standard browser
    Florian> - Working on a font size slider

    Florian> I don't really know if this is of any use for anybody but it's just a fun
    Florian> project by a beginner :-)

    Florian> Now I'd like to know what kind of features you'd like to see in version 0.3 of
    Florian> thc!?

    Florian> Please post them...

    Florian> Have fun!
    Florian> Listick
    Florian> http://www.lictick.org

You could learn something from emacs-muse. That plugin can help emacs to
convert txt to html, tex, pdf, docbook and some other document format.

In emacs-muse, the title and subtitle is defined like this:

*emphasis*
**strong emphasis**
***very strong emphasis***
_underlined_
=verbatim and monospace=

emacs-muse : http://mwolson.org/projects/EmacsMuse.html


From deets at nospam.web.de  Thu May  7 14:23:21 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 20:23:21 +0200
Subject: P2P text chat engine
In-Reply-To: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>
References: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>
Message-ID: <76gn8qF1cliefU1@mid.uni-berlin.de>

Navanjo schrieb:
> If you have the source code of a p2p text chat engine please send to me

I found that & a pot of gold under my bed. Care to give me your address 
so that I can send it to you?

SCNR,
Diez


From deets at nospam.web.de  Thu May  7 14:25:56 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 07 May 2009 20:25:56 +0200
Subject: Updating an Imported Function
In-Reply-To: <mailman.5231.1241719678.11746.python-list@python.org>
References: <mailman.5231.1241719678.11746.python-list@python.org>
Message-ID: <76gndkF1cliefU2@mid.uni-berlin.de>

Donovan Parks schrieb:
> Hello,
> 
> I'm new to Python and have what is probably a very basic question. I
> am writing a helloWorld() function within a file called helloWorld.py:
> 
> def helloWorld():
> 	print 'hi'
> 
> Now, I can import and run this function:
> 
> import helloWorld
> helloWorld.helloWorld()
> 
> Which will print 'hi' as expected. Now, I'd like to update this
> function in my text editor so it is:
> 
> def helloWorld():
> 	print 'hello world'
> 
> Without having to exit my Python interpreter, how can I import this
> revised function? If I do the import again:
> 
> import helloWorld
> 
> And run helloWorld.helloWorld() it will still print out just 'hi'.
> I've tried deleting this function (a weird concept to me as I come
> from a C++ background) using del helloWorld and than importing again,
> but the function will still print out just 'hi'.
> 
> Can this be done? How so?

reload(helloWorld)

But there are some caveats, and IMHO reloading isn't worth the trouble - 
it is *so* easy to write a second script, test.py or whatever, that  you 
just call from a shell. And this has the added benefit that you can 
create even somewhat more elaborate toy-code.

If one wants to play around with objects created, either do

python -i test.py

or try to use pdb, the python debugger, through

import pdb; pdb.set_trace()

to get an interactive prompt at whatever point you want.

Diez


From pavlovevidence at gmail.com  Thu May  7 14:26:37 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 7 May 2009 11:26:37 -0700 (PDT)
Subject: Threading and GIL
References: <60538e1c-47ea-4120-bc91-a9dcebd8f14b@r34g2000vbi.googlegroups.com>
	<a8f972ee-4594-493d-8b53-4a037c0211c0@n4g2000vba.googlegroups.com> 
	<e352ad10-c812-4218-a7db-bc5a6aeef2d4@e23g2000vbe.googlegroups.com>
Message-ID: <72ecd73c-2e6b-4a2a-85fc-e6dd8f8a591a@o27g2000vbd.googlegroups.com>

On May 7, 12:20?am, googler.1.webmas... at spamgourmet.com wrote:
> thats the reason why its not working. Imagine the end() method of the
> thread object is called so the C++ Function is opened where the code
> for this method is in.

You're going to have to post some code if you want better help; this
description is unintelligible.  I don't know what you mean by end()
method, nor whether it's a Python method or C++ method, nor what
exactly you mean by thread object (C++ or Python object?) or C++
Function.


> At a line the Code ...->End() is called which waits that the C++
> Thread class
> is finished. BUT here is the problem: In the Method of the C++ class
> which is in threaded mode can't run because its still waiting that the
> GIL
> is released by the thread which executed the ->End() command.
>
> So the app has a deadlock when it arrives at       ->End() and
> PyGILState_Ensure
> function.

So you have to release the GIL before calling End().  Just surround End
() by Py_BEGIN_ALLOW_THREADS and Py_END_ALLOW_THREADS.  (Presumably
you know the thread state when you call End(); if you don't then
surround the calls to Py_{BEGIN,END}_ALLOW_THREADS with calls to
PyGILState_{Ensure,Release}.  Yes, that means you acquire the GIL just
so you can be sure that you've released it.  I know of no other way to
be sure you don't have the GIL.)

If you are trying to kill a different thread, and I can't quite tell
if that's what you're doing, then be aware that it is very tricky to
do right and most think it to be a bad idea.  If you don't allow the
thread you're killing to clean up it can deadlock, and even if you do,
you have to be careful to clean up properly and you have to be
constantly on guard for what might happen in a thread is killed in the
middle of something.


Carl Banks


From Florian.Wollenschein at FernUni-Hagen.de  Thu May  7 14:33:56 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Thu, 07 May 2009 20:33:56 +0200
Subject: What would YOU like to see in a txt to html converter?
In-Reply-To: <87my9okc1q.fsf@lakeside.sjtu.edu.cn>
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
	<87my9okc1q.fsf@lakeside.sjtu.edu.cn>
Message-ID: <gtv9ik$qes$1@news-cedar.fernuni-hagen.de>

Will Wang wrote:
>>>>>> "Florian" == Florian Wollenschein <Florian.Wollenschein at FernUni-Hagen.de> writes:
> 
>     Florian> As you might have mentioned I'm just working on a txt to html converter called
>     Florian> "thc". This project is intended for me to learn Python and now pyQT4 to which I
>     Florian> changed a few days ago (started with Tkinter).
> 
>     Florian> I have implemented the following features so far:
> 
>     Florian> - Giving a title for the html
>     Florian> - Choose whether it's Transitional or Strict Doctype
>     Florian> - Select a background color
>     Florian> - Show the converted file with the standard browser
>     Florian> - Working on a font size slider
> 
>     Florian> I don't really know if this is of any use for anybody but it's just a fun
>     Florian> project by a beginner :-)
> 
>     Florian> Now I'd like to know what kind of features you'd like to see in version 0.3 of
>     Florian> thc!?
> 
>     Florian> Please post them...
> 
>     Florian> Have fun!
>     Florian> Listick
>     Florian> http://www.lictick.org
> 
> You could learn something from emacs-muse. That plugin can help emacs to
> convert txt to html, tex, pdf, docbook and some other document format.
> 
> In emacs-muse, the title and subtitle is defined like this:
> 
> *emphasis*
> **strong emphasis**
> ***very strong emphasis***
> _underlined_
> =verbatim and monospace=
> 
> emacs-muse : http://mwolson.org/projects/EmacsMuse.html

Thank you for this information. I already thought of using dots or 
asterisks or whatever to let the user format the text instead of using 
html tags (this would be quite paradox ;-)

Please keep on posting ideas...

Thanks again,
Listick
http://www.listick.org


From alan.cameron at iname.com  Thu May  7 14:35:07 2009
From: alan.cameron at iname.com (Alan Cameron)
Date: Thu, 7 May 2009 19:35:07 +0100
Subject: Newcomer to Python tutorial question
Message-ID: <hRFMl.50224$tb.4955@newsfe07.ams2>

I am not sure of this is the right place to ask a question about the 
tutorial

http://docs.python.org/3.0/tutorial/datastructures.html#sets

why is the printed result of

>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>> print(basket)
{'orange', 'banana', 'pear', 'apple'}

in the sequence given?

-- 
Alan Cameron 




From muhammadanushanif at gmail.com  Thu May  7 14:38:04 2009
From: muhammadanushanif at gmail.com (muhammadanushanif at gmail.com)
Date: Thu, 7 May 2009 11:38:04 -0700 (PDT)
Subject: Get Into The World Of YOUSUF JUSANI
Message-ID: <f0b37f32-02ec-4eb2-a395-a766d560f048@b1g2000vbc.googlegroups.com>

Get The Most Valuable and Best For Investment Properties IN ASIA, !!
Real Estate Builders.. Real Estate Dealer Buy, Sell REAL EASTAE IN
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From clp2 at rebertia.com  Thu May  7 14:40:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 7 May 2009 11:40:57 -0700
Subject: Newcomer to Python tutorial question
In-Reply-To: <hRFMl.50224$tb.4955@newsfe07.ams2>
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
Message-ID: <50697b2c0905071140m3978dfa9x6b320e8a3f9d28ee@mail.gmail.com>

On Thu, May 7, 2009 at 11:35 AM, Alan Cameron <alan.cameron at iname.com>
wrote> I am not sure of this is the right place to ask a question
about the
> tutorial
>
> http://docs.python.org/3.0/tutorial/datastructures.html#sets
>
> why is the printed result of
>
>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>> print(basket)
> {'orange', 'banana', 'pear', 'apple'}
>
> in the sequence given?

Because it's *not a sequence* at all, it's a set. Sets are unordered
and contain no duplicate items, hence why the output ordering is
arbitrary and only the unique subset of original elements is present.

Further info: http://docs.python.org/3.0/library/stdtypes.html#set-types-set-frozenset

Cheers,
Chris
-- 
http://blog.rebertia.com


From Florian.Wollenschein at FernUni-Hagen.de  Thu May  7 14:42:20 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Thu, 07 May 2009 20:42:20 +0200
Subject: Newcomer to Python tutorial question
In-Reply-To: <hRFMl.50224$tb.4955@newsfe07.ams2>
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
Message-ID: <gtva2b$10k$1@news-cedar.fernuni-hagen.de>

Alan Cameron wrote:
> I am not sure of this is the right place to ask a question about the 
> tutorial
> 
> http://docs.python.org/3.0/tutorial/datastructures.html#sets
> 
> why is the printed result of
> 
>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>> print(basket)
> {'orange', 'banana', 'pear', 'apple'}
> 
> in the sequence given?
> 

A set is not ordered and eliminates duplicate elements. So the output is 
random in terms of the order and only shows each single item once...

Correct me if I'm wrong :-)

Listick
http://www.listick.org


From arnodel at googlemail.com  Thu May  7 14:43:08 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Thu, 07 May 2009 19:43:08 +0100
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
Message-ID: <m23abgrbyb.fsf@googlemail.com>

"Alan Cameron" <alan.cameron at iname.com> writes:

> I am not sure of this is the right place to ask a question about the 
> tutorial
>
> http://docs.python.org/3.0/tutorial/datastructures.html#sets
>
> why is the printed result of
>
>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>> print(basket)
> {'orange', 'banana', 'pear', 'apple'}
>
> in the sequence given?

A set is an unordered container, but due to the nature of an object
representation (which is a sequence of characters), its representation
has to list the elements in a certain order.  However, this order is not
significant.

-- 
Arnaud


From news123 at free.fr  Thu May  7 14:56:13 2009
From: news123 at free.fr (News123)
Date: Thu, 07 May 2009 20:56:13 +0200
Subject: What would YOU like to see in a txt to html converter?
In-Reply-To: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
Message-ID: <4a032ece$0$4849$426a74cc@news.free.fr>

Florian Wollenschein wrote:
> As you might have mentioned I'm just working on a txt to html converter
> called "thc". This project is intended for me to learn Python and now
> pyQT4 to which I changed a few days ago (started with Tkinter).
> 
> I have implemented the following features so far:
> 
> - Giving a title for the html
> - Choose whether it's Transitional or Strict Doctype
> - Select a background color
> - Show the converted file with the standard browser
> - Working on a font size slider
> 
> I don't really know if this is of any use for anybody but it's just a
> fun project by a beginner :-)
> 
> Now I'd like to know what kind of features you'd like to see in version
> 0.3 of thc!?
> 
> Please post them...
> 
> Have fun!
> Listick
> http://www.lictick.org

I would first think about your personal requirements / use cases.
What kind of texts do you want to convert?

I think there's already quite some text to html converters, which you
could take as inspiration.
Most of them were written for a specific purpose though and started from
text files with some 'formatting syntax'

Exanples:
man2html   converts man pages to html
pod2html   covnerts perl online documentation to html

There's also converters from certain wiki formats to html.

There's also source code formatters for certain programming languages
or log file to html converters which color certain message types


If it is just for plain text with no special formattings,
then you need probably only:
- escape all characters, which have to be escap for html. (but there is
probably already a function for it.
)
- seperate paragraphs (at double new lines or at single new lines. This
could be an option)

- additionally you could allow to specify a html prefix (before the
converted text) and a html post fix after the converted text.

- I would handle settings lik color / font size etc with style sheets
and not within the generated html. If you want you could autgenerate
style sheets from some function arguments. They could contain Font color
/ background color / font formatting . . . .

- you could add a configuration, that automatically tags certain words
with certain tags, to allow simle keyword hihglighting.


It all depends on your use case.







From alan.cameron at iname.com  Thu May  7 14:58:34 2009
From: alan.cameron at iname.com (Alan Cameron)
Date: Thu, 7 May 2009 19:58:34 +0100
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
Message-ID: <fbGMl.6972$hd4.4032@newsfe24.ams2>

"Alan Cameron" <alan.cameron at iname.com> wrote in message 
news:hRFMl.50224$tb.4955 at newsfe07.ams2...
>I am not sure of this is the right place to ask a question about the 
>tutorial
>
> http://docs.python.org/3.0/tutorial/datastructures.html#sets
>
> why is the printed result of
>
>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>> print(basket)
> {'orange', 'banana', 'pear', 'apple'}
>
> in the sequence given?
>
>

Thanks to all who replied.
I assume therefore that the order in which the items of the set are printed 
could vary each time it is printed?


-- 
Alan Cameron 




From __peter__ at web.de  Thu May  7 14:58:49 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 07 May 2009 20:58:49 +0200
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
Message-ID: <gtvb14$bv8$02$1@news.t-online.com>

Alan Cameron wrote:

> I am not sure of this is the right place to ask a question about the
> tutorial
> 
> http://docs.python.org/3.0/tutorial/datastructures.html#sets
> 
> why is the printed result of
> 
>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>> print(basket)
> {'orange', 'banana', 'pear', 'apple'}
> 
> in the sequence given?

As already said by others, the order of items in a set is not part of the 
concept of a set. 

You can even have sets with equal contents that display differently:

Python 3.0.1+ (r301:69556, Apr 15 2009, 17:25:52)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> a = {'orange', 'banana', 'apple', 'orange', 'pear', 'apple'}
>>> b = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>> a == b
True
>>> repr(a) == repr(b)
False
>>> a
{'orange', 'pear', 'apple', 'banana'}
>>> b
{'orange', 'pear', 'banana', 'apple'}

Peter



From amrbekhit at gmail.com  Thu May  7 15:04:18 2009
From: amrbekhit at gmail.com (Amr)
Date: Thu, 7 May 2009 12:04:18 -0700 (PDT)
Subject: Could this expression parser be more 'Pythonic'?
References: <e8f3a550-647b-4ce2-bae3-c160e42e5439@j12g2000vbl.googlegroups.com>
	<b8f53ce0-1bd5-4eb9-a7dd-d9df2b8b5ed9@d19g2000prh.googlegroups.com>
Message-ID: <b72f6d6f-e1e3-47fe-973e-80be92e29c9c@r13g2000vbr.googlegroups.com>

Hi John,

Thanks for the tips, I will check them out.

--Amr


From stefan_ml at behnel.de  Thu May  7 15:05:10 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 07 May 2009 21:05:10 +0200
Subject: What would YOU like to see in a txt to html converter?
In-Reply-To: <gtv9ik$qes$1@news-cedar.fernuni-hagen.de>
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
	<87my9okc1q.fsf@lakeside.sjtu.edu.cn>
	<gtv9ik$qes$1@news-cedar.fernuni-hagen.de>
Message-ID: <4a0330e6$0$30238$9b4e6d93@newsspool1.arcor-online.net>

Florian Wollenschein wrote:
> Will Wang wrote:
>> *emphasis*
>> **strong emphasis**
>> ***very strong emphasis***
>> _underlined_
>> =verbatim and monospace=
>>
>> emacs-muse : http://mwolson.org/projects/EmacsMuse.html
> 
> Thank you for this information. I already thought of using dots or
> asterisks or whatever to let the user format the text instead of using
> html tags (this would be quite paradox ;-)

First thing I'd look at is actually docutils' RestructuredText (ReST).

Stefan


From clp2 at rebertia.com  Thu May  7 15:08:51 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 7 May 2009 12:08:51 -0700
Subject: Newcomer to Python tutorial question
In-Reply-To: <fbGMl.6972$hd4.4032@newsfe24.ams2>
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
	<fbGMl.6972$hd4.4032@newsfe24.ams2>
Message-ID: <50697b2c0905071208q1fd88762xd007706f11b8a829@mail.gmail.com>

On Thu, May 7, 2009 at 11:58 AM, Alan Cameron <alan.cameron at iname.com> wrote:
> "Alan Cameron" <alan.cameron at iname.com> wrote in message
> news:hRFMl.50224$tb.4955 at newsfe07.ams2...
>>I am not sure of this is the right place to ask a question about the
>>tutorial
>>
>> http://docs.python.org/3.0/tutorial/datastructures.html#sets
>>
>> why is the printed result of
>>
>>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>>> print(basket)
>> {'orange', 'banana', 'pear', 'apple'}
>>
>> in the sequence given?
>>
>>
>
> Thanks to all who replied.
> I assume therefore that the order in which the items of the set are printed
> could vary each time it is printed?

Due to the underlying dict-based implementation, the order will stay
the same until you modify the set (i.e. add or remove an element), at
which point it may change; it's basically the same behavior as with
printing a dict.

So this will always print the same thing twice:
print basket
print basket

Whereas this might not:
print basket
#modify the set
basket.discard("banana")
basket.add("banana")
print basket

Cheers,
Chris
-- 
http://blog.rebertia.com


From jcd at sdf.lonestar.org  Thu May  7 15:10:38 2009
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Thu, 07 May 2009 15:10:38 -0400
Subject: Wing vs Netbeans IDE?
In-Reply-To: <B5B90D0DBF4EDC46892E8FD3602BA92A17842758@clipper.glosten.local>
References: <B5B90D0DBF4EDC46892E8FD3602BA92A17842758@clipper.glosten.local>
Message-ID: <1241723438.22531.31.camel@mctell>

On Thu, 2009-05-07 at 10:49 -0700, Benjamin J. Racine wrote:
> I'd love to see an updated shootout between these three, as I cannot for the life of me seem to be able to settle down with one of them.
> 
> Things I don't like: 
> Wing's lack of integrated mercurial/svn support.

Wing *does* have integrated SVN support already, but nothing for the
distributed systems yet.  I just purchased a Wing license this past
week.  So far I'm very happy with it, though I can't speak to a
comparison with other IDEs. 






From __peter__ at web.de  Thu May  7 15:14:07 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 07 May 2009 21:14:07 +0200
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
	<fbGMl.6972$hd4.4032@newsfe24.ams2>
Message-ID: <gtvbtq$dpi$02$1@news.t-online.com>

Alan Cameron wrote:

> "Alan Cameron" <alan.cameron at iname.com> wrote in message
> news:hRFMl.50224$tb.4955 at newsfe07.ams2...
>>I am not sure of this is the right place to ask a question about the
>>tutorial
>>
>> http://docs.python.org/3.0/tutorial/datastructures.html#sets
>>
>> why is the printed result of
>>
>>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>>> print(basket)
>> {'orange', 'banana', 'pear', 'apple'}
>>
>> in the sequence given?
>>
>>
> 
> Thanks to all who replied.
> I assume therefore that the order in which the items of the set are
> printed could vary each time it is printed?

If you don't add or remove items the printed order will not change in the 
current implementation. But as shown in my other post it is possible to 
create sets with equal contents that are printed differently. The actual 
order depends on the set's history of insertions/deletions, so it is not 
truly random. 

But these are implementation details that may change across versions of 
python and your code should never rely on them. If you want a defined order 
convert the set to a sorted list before printing:

>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>> sorted(basket)
['apple', 'banana', 'orange', 'pear']

Peter



From alan.cameron at iname.com  Thu May  7 15:15:44 2009
From: alan.cameron at iname.com (Alan Cameron)
Date: Thu, 7 May 2009 20:15:44 +0100
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2><fbGMl.6972$hd4.4032@newsfe24.ams2>
	<mailman.5238.1241723354.11746.python-list@python.org>
Message-ID: <lrGMl.6973$hd4.2539@newsfe24.ams2>

"Chris Rebert" <clp2 at rebertia.com> wrote in message 
news:mailman.5238.1241723354.11746.python-list at python.org...
> On Thu, May 7, 2009 at 11:58 AM, Alan Cameron <alan.cameron at iname.com> 
> wrote:
>> "Alan Cameron" <alan.cameron at iname.com> wrote in message
>> news:hRFMl.50224$tb.4955 at newsfe07.ams2...
>>>I am not sure of this is the right place to ask a question about the
>>>tutorial
>>>
>>> http://docs.python.org/3.0/tutorial/datastructures.html#sets
>>>
>>> why is the printed result of
>>>
>>>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>>>> print(basket)
>>> {'orange', 'banana', 'pear', 'apple'}
>>>
>>> in the sequence given?
>>>
>>>
>>
>> Thanks to all who replied.
>> I assume therefore that the order in which the items of the set are 
>> printed
>> could vary each time it is printed?
>
> Due to the underlying dict-based implementation, the order will stay
> the same until you modify the set (i.e. add or remove an element), at
> which point it may change; it's basically the same behavior as with
> printing a dict.
>
> So this will always print the same thing twice:
> print basket
> print basket
>
> Whereas this might not:
> print basket
> #modify the set
> basket.discard("banana")
> basket.add("banana")
> print basket
>
> Cheers,
> Chris

Thanks Chris,

It appears that I used a reserved term when I used 'sequence'. I just had 
not reached that far in the tutorial.
I have many years of programming (roughly 50) and want to learn new 
languages.
I find tutorials always fraught with problems due to the knowledge of the 
writer exceeding the knowledge of the reader and using terms and examples 
not yet covered in the tutorial thus far.
I am persevering with my initial foray into Python.

-- 
Alan Cameron 




From googler.1.webmaster at spamgourmet.com  Thu May  7 15:27:00 2009
From: googler.1.webmaster at spamgourmet.com (googler.1.webmaster at spamgourmet.com)
Date: Thu, 7 May 2009 12:27:00 -0700 (PDT)
Subject: Threading and GIL
References: <60538e1c-47ea-4120-bc91-a9dcebd8f14b@r34g2000vbi.googlegroups.com>
	<a8f972ee-4594-493d-8b53-4a037c0211c0@n4g2000vba.googlegroups.com> 
	<e352ad10-c812-4218-a7db-bc5a6aeef2d4@e23g2000vbe.googlegroups.com> 
	<72ecd73c-2e6b-4a2a-85fc-e6dd8f8a591a@o27g2000vbd.googlegroups.com>
Message-ID: <7a659f98-47c3-45f8-b29d-ab3944a2ebb4@s31g2000vbp.googlegroups.com>

hey, thanks, that works fine. I wrapped it around, done a lot of tests
and it works fine.
Just had done a few other things to make it stable.

cheers.


From pruebauno at latinmail.com  Thu May  7 15:47:37 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Thu, 7 May 2009 12:47:37 -0700 (PDT)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org>
Message-ID: <b698a5bf-d43c-412a-a5ee-3753ca31122b@z5g2000vba.googlegroups.com>

On May 6, 9:32?pm, Benjamin Peterson <benja... at python.org> wrote:
> On behalf of the Python development team, I'm thrilled to announce the first and
> only beta release of Python 3.1.
>
> Python 3.1 focuses on the stabilization and optimization of features and changes
> Python 3.0 introduced. ?For example, the new I/O system has been rewritten in C
> for speed. ?File system APIs that use unicode strings now handle paths with
> undecodable bytes in them. [1] Other features include an ordered dictionary
> implementation and support for ttk Tile in Tkinter. ?For a more extensive list
> of changes in 3.1, seehttp://doc.python.org/dev/py3k/whatsnew/3.1.htmlor
> Misc/NEWS in the Python distribution.
>
> Please note that this is a beta release, and as such is not suitable for
> production environments. ?We continue to strive for a high degree of quality,
> but there are still some known problems and the feature sets have not been
> finalized. ?This beta is being released to solicit feedback and hopefully
> discover bugs, as well as allowing you to determine how changes in 3.1 might
> impact you. ?If you find things broken or incorrect, please submit a bug report
> at
>
> ? ?http://bugs.python.org
>
> For more information and downloadable distributions, see the Python 3.1 website:
>
> ? ?http://www.python.org/download/releases/3.1/
>
> See PEP 375 for release schedule details:
>
> ? ?http://www.python.org/dev/peps/pep-0375/
>
> Enjoy,
> -- Benjamin
>
> Benjamin Peterson
> benjamin at python.org
> Release Manager
> (on behalf of the entire python-dev team and 3.1's contributors)


Congratulations!

Is it just me or was some nice summary output added to the make
process? I get a nice list of modules that didn't compile and the ones
where the library could not be found.


From OldGrantonian at googlemail.com  Thu May  7 15:53:38 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Thu, 7 May 2009 12:53:38 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com> 
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com> 
	<Xns9C047FE3D4338duncanbooth@127.0.0.1>
Message-ID: <3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>

On May 7, 12:34?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> OldGrantonian <OldGranton... at googlemail.com> wrote:
> > Thanks to both Steven D'Aprano and Ant :)
>
> >>> ?Sounds like you've downloaded the Python 2.5 version of Easy Install.
>
> > There's no Python 2.6 version of EasyInstall :(
>
> I wonder what I've been running then?
>
>
>
> > For 2.5, there is:
>
> > setuptools-0.6c9.win32-py2.5.exe
>
> > But for 2.6, it's:
>
> > setuptools-0.6c9-py2.6.egg
>
> > For any other egg file, I would use EasyInstall, but I don't think I
> > can use EasyInstall to install EasyInstall :)
>
> No, but you can use ez_setup.
>
> Go tohttp://peak.telecommunity.com/dist/ez_setup.pyand save the content
> of that file as ez_setup.py (cut and paste into your favourite editor may
> be the simplest way) then run it with your chosen Python. It will find and
> install the appropriate version of easy install.
>
> --
> Duncan Boothhttp://kupuguy.blogspot.com


ez_setup worked fine. Thanks for that :)

According to the web site:

http://pypi.python.org/pypi/virtualenv

the next step is to do:

virtualenv ENV

If I do that, I get the following message:

--------------------------------

C:\Python26\Scripts>virtualenv ENV
Traceback (most recent call last):
  File "C:\Python26\Scripts\virtualenv-script.py", line 8, in <module>
    load_entry_point('virtualenv==1.3.3', 'console_scripts',
'virtualenv')()
  File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
\virtualenv.py", line 420
    unzip_setuptools=options.unzip_setuptools)
  File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
\virtualenv.py", line 499
    home_dir, lib_dir, inc_dir, bin_dir = path_locations(home_dir)
  File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
\virtualenv.py", line 521
    import win32api
ImportError: No module named win32api

C:\Python26\Scripts>

--------------------------------

Any advice?


From piet at cs.uu.nl  Thu May  7 15:53:46 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Thu, 07 May 2009 21:53:46 +0200
Subject: Unable to build libpython2.5.so on OS X 10.4
References: <fde3b1d5-8a52-4ff1-9093-9ed470b4f9cb@g20g2000vba.googlegroups.com>
	<mailman.5224.1241714518.11746.python-list@python.org>
	<0e05eca2-b460-4e01-aa54-cc1055f51e7d@q14g2000vbn.googlegroups.com>
Message-ID: <m24ovwlmet.fsf@cs.uu.nl>

>>>>> elwinter <elwinter at verizon.net> (e) wrote:

>e> Hi Ned. The Python module I am building is actually the Python module
>e> for ROOT, a large package from CERN. However, the problem arises
>e> before that code enters the picture, when I am building Python itself.
>e> All I want to do is create "libpython2.5.dylib", or its equivalent,
>e> and I can't seem to make that happen on Tiger.

The standard installer for Python 2.5.4 when installed on Tiger, will
contain a file libpython2.5.a which is a symbolic link to
/Library/Frameworks/Python.framework/Versions/2.5/Python, which
according to the file command, is a shared library. So it is not a
static library, despite of its name!
>e> Thanks,
>e> Eric

>e> On May 7, 12:41?pm, Ned Deily <n... at acm.org> wrote:
>>> In article
>>> <fde3b1d5-8a52-4ff1-9093-9ed470b4f... at g20g2000vba.googlegroups.com>,
>>> ?Eric Winter <elwin... at verizon.net> wrote:
>>> 
>>> > Hi all. I'm trying to build some internal code that needs to link
>>> > against libpython2.5.so on a OS X 10.4 (Tiger) machine. It seems that
>>> > no matter what combination of options and environment variables I give
>>> > to the configure script from python 2.5.1, all I get is the
>>> > libpython2.5.a (the static library). I've googled the problem and
>>> > searched the comp.lang.python archives, but I have been unable to find
>>> > anything that works.
>>> 
>>> Perhaps I misunderstand, but if you are trying to build a C extension
>>> for an existing Python 2.5 installation, using Distutils from that
>>> installation should take care of everything for you. ?Is there a
>>> setup.py file by any chance? ?Are you using a standard python
>>> installation (i.e. python.org installer for instance)? ?More details
>>> might help.
>>> 
>>> --
>>> ?Ned Deily,
>>> ?n... at acm.org


-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From rent.lupin.road at gmail.com  Thu May  7 15:59:50 2009
From: rent.lupin.road at gmail.com (James)
Date: Thu, 7 May 2009 12:59:50 -0700 (PDT)
Subject: Best practice for operations on streams of text
Message-ID: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>

Hello all,
I'm working on some NLP code - what I'm doing is passing a large
number of tokens through a number of filtering / processing steps.

The filters take a token as input, and may or may not yield a token as
a result. For example, I might have filters which lowercases the
input, filter out boring words and filter out duplicates chained
together.

I originally had code like this:
for t0 in token_stream:
  for t1 in lowercase_token(t0):
    for t2 in remove_boring(t1):
      for t3 in remove_dupes(t2):
        yield t3

Apart from being ugly as sin, I only get one token out as
StopIteration is raised before the whole token stream is consumed.

Any suggestions on an elegant way to chain together a bunch of
generators, with processing steps in between?

Thanks,
James


From emile at fenx.com  Thu May  7 16:01:11 2009
From: emile at fenx.com (Emile van Sebille)
Date: Thu, 07 May 2009 13:01:11 -0700
Subject: P2P text chat engine
In-Reply-To: <76gn8qF1cliefU1@mid.uni-berlin.de>
References: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>
	<76gn8qF1cliefU1@mid.uni-berlin.de>
Message-ID: <gtveil$qk7$1@ger.gmane.org>

On 5/7/2009 11:23 AM Diez B. Roggisch said...
> Navanjo schrieb:
>> If you have the source code of a p2p text chat engine please send to me
> 
> I found that & a pot of gold under my bed. Care to give me your address 
> so that I can send it to you?
> 

Yeah -- this is how it starts.  Before too long you'll need my bank 
account info to facilitate the transfer...

:)

Emile



From emile at fenx.com  Thu May  7 16:03:27 2009
From: emile at fenx.com (Emile van Sebille)
Date: Thu, 07 May 2009 13:03:27 -0700
Subject: Which python version do I use with "virtualenv"?
In-Reply-To: <3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com>
	<Xns9C047FE3D4338duncanbooth@127.0.0.1>
	<3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>
Message-ID: <gtvems$qk7$2@ger.gmane.org>

On 5/7/2009 12:53 PM OldGrantonian said...
> On May 7, 12:34 pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
>> OldGrantonian <OldGranton... at googlemail.com> wrote:
>>> Thanks to both Steven D'Aprano and Ant :)
>>>>>  Sounds like you've downloaded the Python 2.5 version of Easy Install.
>>> There's no Python 2.6 version of EasyInstall :(
>> I wonder what I've been running then?
>>
>>
>>
>>> For 2.5, there is:
>>> setuptools-0.6c9.win32-py2.5.exe
>>> But for 2.6, it's:
>>> setuptools-0.6c9-py2.6.egg
>>> For any other egg file, I would use EasyInstall, but I don't think I
>>> can use EasyInstall to install EasyInstall :)
>> No, but you can use ez_setup.
>>
>> Go tohttp://peak.telecommunity.com/dist/ez_setup.pyand save the content
>> of that file as ez_setup.py (cut and paste into your favourite editor may
>> be the simplest way) then run it with your chosen Python. It will find and
>> install the appropriate version of easy install.
>>
>> --
>> Duncan Boothhttp://kupuguy.blogspot.com
> 
> 
> ez_setup worked fine. Thanks for that :)
> 
> According to the web site:
> 
> http://pypi.python.org/pypi/virtualenv
> 
> the next step is to do:
> 
> virtualenv ENV
> 
> If I do that, I get the following message:
> 
> --------------------------------
> 
> C:\Python26\Scripts>virtualenv ENV
> Traceback (most recent call last):
>   File "C:\Python26\Scripts\virtualenv-script.py", line 8, in <module>
>     load_entry_point('virtualenv==1.3.3', 'console_scripts',
> 'virtualenv')()
>   File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
> \virtualenv.py", line 420
>     unzip_setuptools=options.unzip_setuptools)
>   File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
> \virtualenv.py", line 499
>     home_dir, lib_dir, inc_dir, bin_dir = path_locations(home_dir)
>   File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
> \virtualenv.py", line 521
>     import win32api
> ImportError: No module named win32api
> 
> C:\Python26\Scripts>
> 
> --------------------------------
> 
> Any advice?


Install the win32 extensions or install the 2.6 Activestate release.

Emile



From james at agentultra.com  Thu May  7 16:06:43 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 07 May 2009 16:06:43 -0400
Subject: Best practice for operations on streams of text
References: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
Message-ID: <851vr0wucs.fsf@agentultra.com>

James <rent.lupin.road at gmail.com> writes:

> Hello all,
> I'm working on some NLP code - what I'm doing is passing a large
> number of tokens through a number of filtering / processing steps.
>
> The filters take a token as input, and may or may not yield a token as
> a result. For example, I might have filters which lowercases the
> input, filter out boring words and filter out duplicates chained
> together.
>
> I originally had code like this:
> for t0 in token_stream:
>   for t1 in lowercase_token(t0):
>     for t2 in remove_boring(t1):
>       for t3 in remove_dupes(t2):
>         yield t3
>
> Apart from being ugly as sin, I only get one token out as
> StopIteration is raised before the whole token stream is consumed.
>
> Any suggestions on an elegant way to chain together a bunch of
> generators, with processing steps in between?
>
> Thanks,
> James

Co-routines my friends. Google will help you greatly in discovering
this processing wonder.


From tjreedy at udel.edu  Thu May  7 16:10:03 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 16:10:03 -0400
Subject: list comprehension question
In-Reply-To: <8563gcx1p1.fsf@agentultra.com>
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>	<mailman.4883.1241139950.11746.python-list@python.org>	<85ocucnbce.fsf@agentultra.com>	<mailman.4923.1241193638.11746.python-list@python.org>	<85ljpb8r1o.fsf@agentultra.com>	<mailman.5109.1241543371.11746.python-list@python.org>	<85d4am8hq4.fsf@agentultra.com>	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
	<8563gcx1p1.fsf@agentultra.com>
Message-ID: <gtvf6r$uf8$1@ger.gmane.org>

J Kenneth King wrote:
>
> Keep in mind that nested comprehensions are still available because
> they do have a use case that justifies their existence.

Nested comprehensions are available because because the syntax makes 
them available by default and making a fiddly exception would be 
contrary to Python's style.  A list comp creates an iterable. A list 
comp requires use of an iterable.  Therefore, a list comp may use a list 
comp.

> However, I
> think the Python documentation warns against their use because people
> might rely on them for problems where they aren't necessary and since
> they are difficult to read... it can lead to difficult to read code.

Whenever the expression that results in the iterable used by a list comp 
is sufficiently complex, readability is improved by pulling it out as a 
separate statement. Nested list comps are often examplex of such 
sufficiently complex expressions, but not the only possible one.

tjr



From OldGrantonian at googlemail.com  Thu May  7 16:15:41 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Thu, 7 May 2009 13:15:41 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com> 
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com> 
	<Xns9C047FE3D4338duncanbooth@127.0.0.1>
	<3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>
	<mailman.5241.1241726706.11746.python-list@python.org>
Message-ID: <2be30c71-4eb3-4ad7-a138-31ee0698a297@e20g2000vbc.googlegroups.com>

On May 7, 9:03?pm, Emile van Sebille <em... at fenx.com> wrote:
> On 5/7/2009 12:53 PM OldGrantonian said...
>
>
>
> > On May 7, 12:34 pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> >> OldGrantonian <OldGranton... at googlemail.com> wrote:
> >>> Thanks to both Steven D'Aprano and Ant :)
> >>>>> ?Sounds like you've downloaded the Python 2.5 version of Easy Install.
> >>> There's no Python 2.6 version of EasyInstall :(
> >> I wonder what I've been running then?
>
> >>> For 2.5, there is:
> >>> setuptools-0.6c9.win32-py2.5.exe
> >>> But for 2.6, it's:
> >>> setuptools-0.6c9-py2.6.egg
> >>> For any other egg file, I would use EasyInstall, but I don't think I
> >>> can use EasyInstall to install EasyInstall :)
> >> No, but you can use ez_setup.
>
> >> Go tohttp://peak.telecommunity.com/dist/ez_setup.pyandsave the content
> >> of that file as ez_setup.py (cut and paste into your favourite editor may
> >> be the simplest way) then run it with your chosen Python. It will find and
> >> install the appropriate version of easy install.
>
> >> --
> >> Duncan Boothhttp://kupuguy.blogspot.com
>
> > ez_setup worked fine. Thanks for that :)
>
> > According to the web site:
>
> >http://pypi.python.org/pypi/virtualenv
>
> > the next step is to do:
>
> > virtualenv ENV
>
> > If I do that, I get the following message:
>
> > --------------------------------
>
> > C:\Python26\Scripts>virtualenv ENV
> > Traceback (most recent call last):
> > ? File "C:\Python26\Scripts\virtualenv-script.py", line 8, in <module>
> > ? ? load_entry_point('virtualenv==1.3.3', 'console_scripts',
> > 'virtualenv')()
> > ? File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
> > \virtualenv.py", line 420
> > ? ? unzip_setuptools=options.unzip_setuptools)
> > ? File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
> > \virtualenv.py", line 499
> > ? ? home_dir, lib_dir, inc_dir, bin_dir = path_locations(home_dir)
> > ? File "C:\Python26\lib\site-packages\virtualenv-1.3.3-py2.6.egg
> > \virtualenv.py", line 521
> > ? ? import win32api
> > ImportError: No module named win32api
>
> > C:\Python26\Scripts>
>
> > --------------------------------
>
> > Any advice?
>
> Install the win32 extensions or install the 2.6 Activestate release.
>
> Emile


Thanks for the response :)

Where do I find the win32 extensions?



From tjreedy at udel.edu  Thu May  7 16:21:52 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 16:21:52 -0400
Subject: Python 3.1 beta 1
In-Reply-To: <7c96bd34-b199-4646-a790-4097adcc6999@q14g2000vbn.googlegroups.com>
References: <mailman.5198.1241663377.11746.python-list@python.org>
	<7c96bd34-b199-4646-a790-4097adcc6999@q14g2000vbn.googlegroups.com>
Message-ID: <gtvft0$17j$1@ger.gmane.org>

bearophileHUGS at lycos.com wrote:

> Is the order inside OrderedDict kept with a double linked list of the
> items?

That is one of the things Raymond tried.  Check the code for what he 
settled on for the Python version.  I believe he thinks the best C 
implementation might be different from the best Python version.

>> The OrderedDict constructor and update() method both accept
 >> keyword arguments, but their order is lost because Python's
 >> function call semantics pass-in keyword arguments using a regular
 >> unordered dictionary.
> 
> This is unfortunate :-(
> Well, I'd like function call semantics pass-in keyword arguments to
> use OrderedDicts then... :-)

This possibility has been discussed on pydev.
It would require a sufficiently fast C implementation.

tjr



From gherron at islandtraining.com  Thu May  7 16:23:57 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 07 May 2009 13:23:57 -0700
Subject: Best practice for operations on streams of text
In-Reply-To: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
References: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
Message-ID: <4A03435D.20908@islandtraining.com>

James wrote:
> Hello all,
> I'm working on some NLP code - what I'm doing is passing a large
> number of tokens through a number of filtering / processing steps.
>
> The filters take a token as input, and may or may not yield a token as
> a result. For example, I might have filters which lowercases the
> input, filter out boring words and filter out duplicates chained
> together.
>
> I originally had code like this:
> for t0 in token_stream:
>   for t1 in lowercase_token(t0):
>     for t2 in remove_boring(t1):
>       for t3 in remove_dupes(t2):
>         yield t3
>
> Apart from being ugly as sin, I only get one token out as
> StopIteration is raised before the whole token stream is consumed.
>
> Any suggestions on an elegant way to chain together a bunch of
> generators, with processing steps in between?
>
> Thanks,
> James
> --
> http://mail.python.org/mailman/listinfo/python-list
>   

David Beazly has a very interesting talk on using generators for 
building and linking together individual stream filters.  Its very cool 
and surprisingly eye-opening.

See "Generator Tricks for Systems Programmers" at  
http://www.dabeaz.com/generators/

Gary Herron




From duncan.booth at invalid.invalid  Thu May  7 16:33:12 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 7 May 2009 20:33:12 GMT
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com>
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com>
	<Xns9C047FE3D4338duncanbooth@127.0.0.1>
	<3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>
	<mailman.5241.1241726706.11746.python-list@python.org>
	<2be30c71-4eb3-4ad7-a138-31ee0698a297@e20g2000vbc.googlegroups.com>
Message-ID: <Xns9C04DB348C134duncanbooth@127.0.0.1>

OldGrantonian <OldGrantonian at googlemail.com> wrote:

> Where do I find the win32 extensions?

http://www.google.com/search?q=python+win32

Any of the first 4 hits should help.


From Shawn at Milochik.com  Thu May  7 16:36:55 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Thu, 7 May 2009 16:36:55 -0400
Subject: Downloading most recently modified files
In-Reply-To: <23432457.post@talk.nabble.com>
References: <23432457.post@talk.nabble.com>
Message-ID: <2dc0c81b0905071336l365f6b3aq51761873b52e38d0@mail.gmail.com>

On Thu, May 7, 2009 at 2:19 PM, AllenLars <allenreas at gmail.com> wrote:
>
> I am trying to code a script that will allow me to go to ftp site and
> download files based on most recently modified file (date, time). ?I am
> brand new to programming. ?Any and all help is appreciated.
> --<snip>


I've actually written code to do this, and it's fairly easy. Just use
the FTP module to run the "ls" (directory listing) command and parse
the results to get the filenames and timestamps. Then you will be able
to easily do download requests for the file(s) you want.

Perhaps someone else on the list can chime in with a more elegant solution.

Here's enough to get you started:

from ftplib import FTP   #(http://docs.python.org/library/ftplib.html)

ShawnMilo


From pruebauno at latinmail.com  Thu May  7 16:39:25 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Thu, 7 May 2009 13:39:25 -0700 (PDT)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org> 
	<7c96bd34-b199-4646-a790-4097adcc6999@q14g2000vbn.googlegroups.com>
Message-ID: <e0eff93a-3be2-4138-a6e4-95c6f352f79c@n4g2000vba.googlegroups.com>

On May 7, 11:57?am, bearophileH... at lycos.com wrote:
> >Equality tests between OrderedDict objects are order-sensitive and are implemented as list(od1.items())==list(od2.items()). Equality tests between OrderedDict objects and other Mapping objects are order-insensitive<
>
> very nice idea.
>

I don't know if somebody else is interested but I wouldn't mind
support to OrderedDict and namedtuple in the csv module:

Have csv.DictReader return an OrderedDict instead of a regular one
(based on the order of the column names in the header line).

Have csv.DictWriter accept an OrderedDict. That would take care of
this:

"Note that unlike the DictReader class, the fieldnames parameter of
the DictWriter is not optional. Since Python?s dict objects are not
ordered, there is not enough information available to deduce the order
in which the row should be written to the csvfile."
http://docs.python.org/dev/py3k/library/csv.html#csv.DictWriter

Add a new csv.NamedTupleReader and csv.NamedTupleWriter that work
similar to the DictReader and DictWriter then this snippet (in
examples http://docs.python.org/dev/py3k/library/collections.html#collections.namedtuple
):

EmployeeRecord = namedtuple('EmployeeRecord', 'name, age, title,
department, paygrade')
import csv
for emp in map(EmployeeRecord._make, csv.reader(open("employees.csv",
"rb"))):
    print(emp.name, emp.title)

Could be rewritten as:

import csv
for emp in csv.NamedTupleReader("employees.csv"):
    print(emp.name, emp.title)


Also, is there a way to convert a OrderedDict into a namedtuple? It is
possible to go the other direction using namedtuple._asdict, but I
don't see a _fromdict method.

And thanks Steven and Raymond for the Counter class. Several people
had started to see the common pattern and now we have it in the
stdlib.


From piet at cs.uu.nl  Thu May  7 16:43:26 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Thu, 07 May 2009 22:43:26 +0200
Subject: SimpleXMLRPCServer and creating a new object on for each new
	client request.
References: <mailman.5173.1241647285.11746.python-list@python.org>
Message-ID: <m2ws8sk5jl.fsf@cs.uu.nl>

>>>>> Jelle Smet <jelle at smetj.net> (JS) wrote:

>JS> Hi list,
>JS> My goals is to have concurrent and separated client sessions using xmlrpc.
>JS> Initially my though was that SimpleXMLRPCServer was able to create a new
>JS> object instance for each incoming request.

>JS> But this doesn't appear to be the case, unless I'm overlooking something,
>JS> if so please point me out.

You create a single instance of your class and then register that. There
is nothing in your code that makes the server believe it should create a
new instance for each request. 

And then of course this instance always returns the same random number.
It could generate a new random number for each call as follows:
       def show_random(self):
                return random.randrange(0,100000)
but I guess this is not what you want.

Otherwise you would have to register a function that creates a new
instance on every call.
But as Martin P. Hellwig has noted, it wouldn't give you sessions anyway.

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From google at mrabarnett.plus.com  Thu May  7 17:07:42 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 07 May 2009 22:07:42 +0100
Subject: Best practice for operations on streams of text
In-Reply-To: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
References: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
Message-ID: <4A034D9E.7030106@mrabarnett.plus.com>

James wrote:
> Hello all,
> I'm working on some NLP code - what I'm doing is passing a large
> number of tokens through a number of filtering / processing steps.
> 
> The filters take a token as input, and may or may not yield a token as
> a result. For example, I might have filters which lowercases the
> input, filter out boring words and filter out duplicates chained
> together.
> 
> I originally had code like this:
> for t0 in token_stream:
>   for t1 in lowercase_token(t0):
>     for t2 in remove_boring(t1):
>       for t3 in remove_dupes(t2):
>         yield t3
> 
> Apart from being ugly as sin, I only get one token out as
> StopIteration is raised before the whole token stream is consumed.
> 
> Any suggestions on an elegant way to chain together a bunch of
> generators, with processing steps in between?
> 
What you should be doing is letting the filters accept an iterator and
yield values on demand:

def lowercase_token(stream):
     for t in stream:
         yield t.lower()

def remove_boring(stream):
     for t in stream:
         if t not in boring:
             yield t

def remove_dupes(stream):
     seen = set()
     for t in stream:
         if t not in seen:
             yield t
             seen.add(t)

def compound_filter(token_stream):
     stream = lowercase_token(token_stream)
     stream = remove_boring(stream)
     stream = remove_dupes(stream)
     for t in stream(t):
         yield t


From Kevin.Smith at sas.com  Thu May  7 17:23:31 2009
From: Kevin.Smith at sas.com (Kevin D. Smith)
Date: Thu, 7 May 2009 16:23:31 -0500
Subject: heapq.merge with key=
Message-ID: <gtvjgk$tm8$1@foggy.unx.sas.com>

I need the behavior of heapq.merge to merge a bunch of results from a 
database.  I was doing this with sorted(itertools.chain(...), key=...), 
but I would prefer to do this with generators.  My issue is that I need 
the key= argument to sort on the correct field in the database.  
heapq.merge doesn't have this argument and I don't understand the code 
enough to know if it's possible to add it.  Is this enhancement 
possible without drastically changing the current code?

-- 
Kevin D. Smith



From danmcleran at yahoo.com  Thu May  7 17:31:40 2009
From: danmcleran at yahoo.com (danmcleran at yahoo.com)
Date: Thu, 7 May 2009 14:31:40 -0700 (PDT)
Subject: Python 2.4.3 array memory leak
Message-ID: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>

I am using the array module to instantiate many arrays in my
application. It seems like there is a memory leak in there somewhere.
Can anyone confim this and let me know what, if anything, I can do
about it? I am using Fedora Core 5 Linux:

import commands
import array
import itertools
import sys

from itertools import repeat

print '*** before ***'
print commands.getoutput('cat /proc/meminfo').split('\n')[1]
for i in range(100):
    a = array.array('I', repeat(0, int(2E6)))
    del a
print '*** after ***'
print commands.getoutput('cat /proc/meminfo').split('\n')[1]

Output:
*** before ***
MemFree:       1459772 kB
*** after ***
MemFree:       1457688 kB


From bearophileHUGS at lycos.com  Thu May  7 17:33:07 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 7 May 2009 14:33:07 -0700 (PDT)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org> 
	<7c96bd34-b199-4646-a790-4097adcc6999@q14g2000vbn.googlegroups.com> 
	<mailman.5244.1241727728.11746.python-list@python.org>
Message-ID: <854351d6-79ae-47b9-8757-22028443011c@x6g2000vbg.googlegroups.com>

Terry Reedy:
bearophile:
> > Well, I'd like function call semantics pass-in keyword arguments to
> > use OrderedDicts then... :-)

[...]
> It would require a sufficiently fast C implementation.

Right.
Such dict is usually small, so if people want it ordered, it may be
better to just use an array of name-value structs instead of a dict or
ordered dict. Iterating on a 10-pair array is fast on modern CPUs.

Bye,
bearophile


From tjreedy at udel.edu  Thu May  7 17:44:50 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 17:44:50 -0400
Subject: Newcomer to Python tutorial question
In-Reply-To: <lrGMl.6973$hd4.2539@newsfe24.ams2>
References: <hRFMl.50224$tb.4955@newsfe07.ams2><fbGMl.6972$hd4.4032@newsfe24.ams2>	<mailman.5238.1241723354.11746.python-list@python.org>
	<lrGMl.6973$hd4.2539@newsfe24.ams2>
Message-ID: <gtvkoi$ist$1@ger.gmane.org>

Alan Cameron wrote:
>
>>>> why is the printed result of
>>>>
>>>>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>>>>> print(basket)
>>>> {'orange', 'banana', 'pear', 'apple'}
>>>>
>>>> in the sequence given?

> It appears that I used a reserved term when I used 'sequence'.

No and Sort-of.

No: We often use it in the normal English sense of ordered items, as I 
and I think others assume you did.  Your question is quite legitimate, 
and the answer, as indicated, is how an implementation interacts with 
the sequence of additions.

Sort-of: The library manual section of Sequence Types lists the sequence 
operations common to all or most built-in Python sequence classes.  But 
it does not explicitly define sequence.  Ranges, which are iterables 
that directly support only indexing and len(), are called sequences. 
Dicts, which are iterables that support len() but are usually not 
indexed by integers, are not.  So that suggests a minimal definition of 
sequence, but all the other sequence classes support much more that is 
typically assumed.

Keywords are reserved terms in the language such as 'if' and 'None' that 
are specially recognized by the parser and which affect compilation. 
Identifiers of the form '__x...y__' are reserved names.  Non-terminal 
terms in the grammar are reserved terms, in a sense, within the 
reference manual, but 'expression_list', not 'sequence', is used for 
comma-separated sequences of expressions in code.  The comma-separated 
sequence of items in a function call is separately defined as an 
'argument_list' because 'keyword_item's like 'a=b' and '*' and '**' are 
not expressions and because there are some order restrictions on 
argument items.

Terry Jan Reedy



From danmcleran at yahoo.com  Thu May  7 17:47:01 2009
From: danmcleran at yahoo.com (danmcleran at yahoo.com)
Date: Thu, 7 May 2009 14:47:01 -0700 (PDT)
Subject: Python 2.4.3 array memory leak
References: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
Message-ID: <3291c0b8-7e4b-40fe-8984-8562b5c49038@n4g2000vba.googlegroups.com>

On May 7, 3:31 pm, "danmcle... at yahoo.com" <danmcle... at yahoo.com>
wrote:
> I am using the array module to instantiate many arrays in my
> application. It seems like there is a memory leak in there somewhere.
> Can anyone confim this and let me know what, if anything, I can do
> about it? I am using Fedora Core 5 Linux:
>
> import commands
> import array
> import itertools
> import sys
>
> from itertools import repeat
>
> print '*** before ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> for i in range(100):
>     a = array.array('I', repeat(0, int(2E6)))
>     del a
> print '*** after ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> Output:
> *** before ***
> MemFree:       1459772 kB
> *** after ***
> MemFree:       1457688 kB

I hate to reply to my own thread but I wanted to update it. I tried
the same code using ctypes arrays and see no memory leak:

import commands
import array
import itertools
import sys
import ctypes

from itertools import repeat
from ctypes import *

print '*** before ***'
print commands.getoutput('cat /proc/meminfo').split('\n')[1]
for i in range(100):
    a = ARRAY(c_uint, int(2E6))
    del a
print '*** after ***'
print commands.getoutput('cat /proc/meminfo').split('\n')[1]

*** before ***
MemFree:       1416364 kB
*** after ***
MemFree:       1416364 kB


From danmcleran at yahoo.com  Thu May  7 17:58:26 2009
From: danmcleran at yahoo.com (danmcleran at yahoo.com)
Date: Thu, 7 May 2009 14:58:26 -0700 (PDT)
Subject: Python 2.4.3 array memory leak
References: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
	<3291c0b8-7e4b-40fe-8984-8562b5c49038@n4g2000vba.googlegroups.com>
Message-ID: <d72079b9-220c-4d20-83b1-aaf2f8f8f3bd@l28g2000vba.googlegroups.com>

On May 7, 3:47 pm, "danmcle... at yahoo.com" <danmcle... at yahoo.com>
wrote:
> On May 7, 3:31 pm, "danmcle... at yahoo.com" <danmcle... at yahoo.com>
> wrote:
>
>
>
> > I am using the array module to instantiate many arrays in my
> > application. It seems like there is a memory leak in there somewhere.
> > Can anyone confim this and let me know what, if anything, I can do
> > about it? I am using Fedora Core 5 Linux:
>
> > import commands
> > import array
> > import itertools
> > import sys
>
> > from itertools import repeat
>
> > print '*** before ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> > for i in range(100):
> >     a = array.array('I', repeat(0, int(2E6)))
> >     del a
> > print '*** after ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> > Output:
> > *** before ***
> > MemFree:       1459772 kB
> > *** after ***
> > MemFree:       1457688 kB
>
> I hate to reply to my own thread but I wanted to update it. I tried
> the same code using ctypes arrays and see no memory leak:
>
> import commands
> import array
> import itertools
> import sys
> import ctypes
>
> from itertools import repeat
> from ctypes import *
>
> print '*** before ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> for i in range(100):
>     a = ARRAY(c_uint, int(2E6))
>     del a
> print '*** after ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> *** before ***
> MemFree:       1416364 kB
> *** after ***
> MemFree:       1416364 kB


The above code was not correct. I actually do see a memory leak when
using ctypes arrays also. What is going on?


import commands
import array
import itertools
import sys
import ctypes

from itertools import repeat
from ctypes import *

print '*** before ***'
print commands.getoutput('cat /proc/meminfo').split('\n')[1]
for i in range(100):
    a = ARRAY(c_uint, int(2E6))()
    del a
print '*** after ***'
print commands.getoutput('cat /proc/meminfo').split('\n')[1]

Output
*** before ***
MemFree:       1564096 kB
*** after ***
MemFree:       1556884 kB


From norseman at hughes.net  Thu May  7 17:58:29 2009
From: norseman at hughes.net (norseman)
Date: Thu, 07 May 2009 14:58:29 -0700
Subject: subprocess.Popen howto?
In-Reply-To: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>
References: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>
Message-ID: <4A035985.1080806@hughes.net>

?ystein Johansen (OJOHANS) wrote:
> Hi,
>  
> I have problems understanding the subprocess.Popen object. I have a 
> iterative calculation in a process running and I want to pipe the output 
> (stdout) from this calculation to a Python script.
>  
> Let me include a simple code that simulates the calculating process:
> /* This code simulates a big iterative calculation */
> #include <stdio.h>
> #include <math.h>
>  
> int main()
> {
>  float val[2] = { M_PI, M_E };
>  int i;
>  
>  for ( i = 0; i < 2 i++) {
>   sleep( 15 );   /* It's a hard calculation. It take 15 seconds */
>   printf("Value: %5.6f\n", val[i] );
>   fflush( stdout );
>  }
>  return 0;
> }
>  
> let's compile this to mycalc: gcc -o mycalc calc.c ... (untested code)
>  
> In C I have this code which starts the mycalc process and handles the 
> output from it:
>  
> #include <stdio.h>
> #include <assert.h>
> #define BUF_SIZE 256
>  
> int main()
> {
>  FILE *pip;
>  char line[BUF_SIZE];
>  
>  pip = popen("mycalc", "r");
>  assert( pip != NULL );
>  
>  while ( fgets( line, BUF_SIZE, pip )) {
>   printf( "Hello; I got: %s \n", line );
>   fflush( stdout );
>  }
>  pclose( pip );
>  return 0;
> }
> How can I make such while-loop in Python? I assume I should use 
> subprocess.Popen(), but I can't figure out how?
>  
> -?ystein
>  
>  
> 
> -------------------------------------------------------------------
> The information contained in this message may be CONFIDENTIAL and is
> intended for the addressee only. Any unauthorised use, dissemination of the
> information or copying of this message is prohibited. If you are not the
> addressee, please notify the sender immediately by return e-mail and delete
> this message.
> Thank you.
> 
> 
> ------------------------------------------------------------------------
> 
> --
> http://mail.python.org/mailman/listinfo/python-list
================================

If you don't like a lot of typing that obscures the process,
take a look at os.Popen2  Pg.39 or so in Lib.pdf for 2.5.2
In this case - the popen3 is probably your best bet.

I took a test run on "subprocess" a few months ago. My review:
excessive typing to accomplish the simple.  BlackBox stuff is supposed 
to be short and sweet.

BlackBox was the term applied to drivers and couplers back when.
Back when: one started by writing a subroutine that got used.
            next one got to write a program
            next one got to write an application
            then a BlackBox
            from there one could graduate to OS
That was back when!


to repeat from another of my postings:
                         ---
processPython 2.5.2 (r252:60911, Mar  4 2008, 10:40:55)
[GCC 3.3.6] on linux2
Type "help", "copyright", "credits" or "license" for more information.

 >>> import os
 >>> AbWd = os.spawnlp( os.P_WAIT,"abiword","abiword","")

The P_WAIT stops python until the program (abiword in this case) 
completes.  The "" at the end are for tokens to be given to the program 
and yes - contrary to manual, the program MUST be there TWICE (complete 
with any path needed).

for windows this works:
(for cut and paste from cmd.exe, see:
   Re: Copy & Paste in a Dos box  from norseman  05/06/2009 4:28PM
)

Python 2.5.1 ... on win32
 >>> import os
 >>> result = os.spawnl( os.P_WAIT, "d:\\winmcad\\mcad","")

Runs the program mcad. Returns to python when mcad exits.
                         ---


In your case:  substitute ..."your_compiled_c_program", " >yourPy.py")
                 at the obvious places.

In case this isn't clear;
   method 1:  py1.py starts compiled.c which redirects to yourPy.py
   method 2:  py1.py uses os.popen3(compiled.c...) & the two work it out.
In either case the receiver at the end stays open until completion so 
sleep() things are not needed.  (may need to test for EOL and EOT)

HTH

Steve
norseman at hughes.net


From danmcleran at yahoo.com  Thu May  7 18:12:32 2009
From: danmcleran at yahoo.com (danmcleran at yahoo.com)
Date: Thu, 7 May 2009 15:12:32 -0700 (PDT)
Subject: Python 2.4.3 array memory leak
References: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
	<3291c0b8-7e4b-40fe-8984-8562b5c49038@n4g2000vba.googlegroups.com> 
	<d72079b9-220c-4d20-83b1-aaf2f8f8f3bd@l28g2000vba.googlegroups.com>
Message-ID: <404a2491-5f31-4268-9d03-4f59e7eabd51@p4g2000vba.googlegroups.com>

On May 7, 3:58 pm, "danmcle... at yahoo.com" <danmcle... at yahoo.com>
wrote:
> On May 7, 3:47 pm, "danmcle... at yahoo.com" <danmcle... at yahoo.com>
> wrote:
>
>
>
> > On May 7, 3:31 pm, "danmcle... at yahoo.com" <danmcle... at yahoo.com>
> > wrote:
>
> > > I am using the array module to instantiate many arrays in my
> > > application. It seems like there is a memory leak in there somewhere.
> > > Can anyone confim this and let me know what, if anything, I can do
> > > about it? I am using Fedora Core 5 Linux:
>
> > > import commands
> > > import array
> > > import itertools
> > > import sys
>
> > > from itertools import repeat
>
> > > print '*** before ***'
> > > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> > > for i in range(100):
> > >     a = array.array('I', repeat(0, int(2E6)))
> > >     del a
> > > print '*** after ***'
> > > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> > > Output:
> > > *** before ***
> > > MemFree:       1459772 kB
> > > *** after ***
> > > MemFree:       1457688 kB
>
> > I hate to reply to my own thread but I wanted to update it. I tried
> > the same code using ctypes arrays and see no memory leak:
>
> > import commands
> > import array
> > import itertools
> > import sys
> > import ctypes
>
> > from itertools import repeat
> > from ctypes import *
>
> > print '*** before ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> > for i in range(100):
> >     a = ARRAY(c_uint, int(2E6))
> >     del a
> > print '*** after ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> > *** before ***
> > MemFree:       1416364 kB
> > *** after ***
> > MemFree:       1416364 kB
>
> The above code was not correct. I actually do see a memory leak when
> using ctypes arrays also. What is going on?
>
> import commands
> import array
> import itertools
> import sys
> import ctypes
>
> from itertools import repeat
> from ctypes import *
>
> print '*** before ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> for i in range(100):
>     a = ARRAY(c_uint, int(2E6))()
>     del a
> print '*** after ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> Output
> *** before ***
> MemFree:       1564096 kB
> *** after ***
> MemFree:       1556884 kB


Maybe the problem is with the way I was looking at free memory. I
changed my code to look at virtual memory allocated to the process in
question and I do not see any appreciable before/after difference.

import commands
import array
import itertools
import sys
import os

from itertools import repeat

deltas = []
print '*** before ***'
s = commands.getoutput('cat /proc/%d/status' % os.getpid()).split('\n')
[12]
print s
for i in range(100):
    a = array.array('I', repeat(0, int(2E6)))
    del a

print '*** after ***'
s = commands.getoutput('cat /proc/%d/status' % os.getpid()).split('\n')
[12]
print s

Output:

*** before ***
VmSize:	    5952 kB
*** after ***
VmSize:	    5956 kB


From tjreedy at udel.edu  Thu May  7 18:32:25 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 18:32:25 -0400
Subject: Best practice for operations on streams of text
In-Reply-To: <4A034D9E.7030106@mrabarnett.plus.com>
References: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
	<4A034D9E.7030106@mrabarnett.plus.com>
Message-ID: <gtvnho$qvs$1@ger.gmane.org>

MRAB wrote:
> James wrote:
>> Hello all,
>> I'm working on some NLP code - what I'm doing is passing a large
>> number of tokens through a number of filtering / processing steps.
>>
>> The filters take a token as input, and may or may not yield a token as
>> a result. For example, I might have filters which lowercases the
>> input, filter out boring words and filter out duplicates chained
>> together.
>>
>> I originally had code like this:
>> for t0 in token_stream:
>>   for t1 in lowercase_token(t0):
>>     for t2 in remove_boring(t1):
>>       for t3 in remove_dupes(t2):
>>         yield t3

For that to work at all, the three functions would have to turn each 
token into an iterable of 0 or 1 tokens.  Hence the inner 'loops' would 
execute 0 or 1 times.  Better to return a token or None, and replace the 
three inner 'loops' with three conditional statements (ugly too) or less 
efficiently (due to lack of short circuiting),

t = remove_dupes(remove_boring(lowercase_token(t0)))
if t is not None: yield t

>> Apart from being ugly as sin, I only get one token out as
>> StopIteration is raised before the whole token stream is consumed.

That puzzles me.  Your actual code must be slightly different from the 
above and what I imagine the functions to be.  But nevermind, because

>> Any suggestions on an elegant way to chain together a bunch of
>> generators, with processing steps in between?

MRAB's suggestion is the way to go.  Your automatically get 
short-circuiting because each generator only gets what is passed on. 
And resuming a generator is much faster that re-calling a function.

> What you should be doing is letting the filters accept an iterator and
> yield values on demand:
> 
> def lowercase_token(stream):
>     for t in stream:
>         yield t.lower()
> 
> def remove_boring(stream):
>     for t in stream:
>         if t not in boring:
>             yield t
> 
> def remove_dupes(stream):
>     seen = set()
>     for t in stream:
>         if t not in seen:
>             yield t
>             seen.add(t)
> 
> def compound_filter(token_stream):
>     stream = lowercase_token(token_stream)
>     stream = remove_boring(stream)
>     stream = remove_dupes(stream)
>     for t in stream(t):
>         yield t

I also recommend the Beazly reference Herron gave.

tjr



From benjamin at python.org  Thu May  7 18:33:49 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Thu, 7 May 2009 22:33:49 +0000 (UTC)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org>
	<b698a5bf-d43c-412a-a5ee-3753ca31122b@z5g2000vba.googlegroups.com>
Message-ID: <loom.20090507T223236-49@post.gmane.org>

 <pruebauno <at> latinmail.com> writes:
> Congratulations!

Thanks!

> 
> Is it just me or was some nice summary output added to the make
> process? I get a nice list of modules that didn't compile and the ones
> where the library could not be found.

Are you compiling on a different platform? The nice output has been around for a
while, bu only on non-Windows platforms.






From benjamin at python.org  Thu May  7 18:37:46 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Thu, 7 May 2009 22:37:46 +0000 (UTC)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org>
	<7c96bd34-b199-4646-a790-4097adcc6999@q14g2000vbn.googlegroups.com>
Message-ID: <loom.20090507T223606-832@post.gmane.org>

 <bearophileHUGS <at> lycos.com> writes:
> 
> collections.Counter and collections.OrderedDict: very nice and useful.
> Is the order inside OrderedDict kept with a double linked list of the
> items?
 
There's a doubly-linked list containing the values. Another dictionary maps keys
to the list.





From tjreedy at udel.edu  Thu May  7 18:41:10 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 07 May 2009 18:41:10 -0400
Subject: Python 2.4.3 array memory leak
In-Reply-To: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
References: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
Message-ID: <gtvo26$s8m$1@ger.gmane.org>

danmcleran at yahoo.com wrote:
> I am using the array module to instantiate many arrays in my
> application. It seems like there is a memory leak in there somewhere.
> Can anyone confim this and let me know what, if anything, I can do
> about it? I am using Fedora Core 5 Linux:
> 
> import commands
> import array
> import itertools
> import sys
> 
> from itertools import repeat
> 
> print '*** before ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> for i in range(100):
>     a = array.array('I', repeat(0, int(2E6)))
>     del a
> print '*** after ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> 
> Output:
> *** before ***
> MemFree:       1459772 kB
> *** after ***
> MemFree:       1457688 kB

What happens if you remove the loop?  I would not be surprised if Python 
grabs the memory once, reuses it, and does not let go.  That is not a 
leak.  What happens if you put the after inside the loop?  Does mem 
usage steadily increase, and continue if you increase range to 1000, 
10000?  That would be a leak.

If there actually is a problem, try a later version of Python.



From danmcleran at yahoo.com  Thu May  7 18:48:51 2009
From: danmcleran at yahoo.com (danmcleran at yahoo.com)
Date: Thu, 7 May 2009 15:48:51 -0700 (PDT)
Subject: Python 2.4.3 array memory leak
References: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
	<mailman.5253.1241736088.11746.python-list@python.org>
Message-ID: <8a515208-f90c-4a1f-a467-0271e623ed77@t11g2000vbc.googlegroups.com>

On May 7, 4:41?pm, Terry Reedy <tjre... at udel.edu> wrote:
> danmcle... at yahoo.com wrote:
> > I am using the array module to instantiate many arrays in my
> > application. It seems like there is a memory leak in there somewhere.
> > Can anyone confim this and let me know what, if anything, I can do
> > about it? I am using Fedora Core 5 Linux:
>
> > import commands
> > import array
> > import itertools
> > import sys
>
> > from itertools import repeat
>
> > print '*** before ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> > for i in range(100):
> > ? ? a = array.array('I', repeat(0, int(2E6)))
> > ? ? del a
> > print '*** after ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> > Output:
> > *** before ***
> > MemFree: ? ? ? 1459772 kB
> > *** after ***
> > MemFree: ? ? ? 1457688 kB
>
> What happens if you remove the loop? ?I would not be surprised if Python
> grabs the memory once, reuses it, and does not let go. ?That is not a
> leak. ?What happens if you put the after inside the loop? ?Does mem
> usage steadily increase, and continue if you increase range to 1000,
> 10000? ?That would be a leak.
>
> If there actually is a problem, try a later version of Python.

I'm not convinced there is a problem anymore. In my latest code, I
record the virtual mem allocated to my specific process and I do not
see it increasing. I would think that if I was leaking memory, I
should see a steady increase in virtual memory consumed by my process,
which I do not.

thanks


From clp2 at rebertia.com  Thu May  7 18:54:39 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 7 May 2009 15:54:39 -0700
Subject: subprocess.Popen howto?
In-Reply-To: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>
References: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>
Message-ID: <50697b2c0905071554pa58d997k405f00662cbb03d1@mail.gmail.com>

2009/5/7 ?ystein Johansen (OJOHANS) <OJOHANS at statoilhydro.com>:
> Hi,
>
> I have problems understanding the subprocess.Popen object. I have a
> iterative calculation in a process running and I want to pipe the output
> (stdout)?from this calculation to a Python script.
>
> Let me include a simple code that simulates the calculating process:
> /* This code simulates a big iterative calculation */
> #include <stdio.h>
> #include <math.h>
>
> int main()
> {
> ?float val[2] = { M_PI, M_E };
> ?int i;
>
> ?for ( i = 0; i < 2 i++) {
> ??sleep( 15 );?? /* It's a hard calculation. It take 15 seconds */
> ??printf("Value: %5.6f\n", val[i] );
> ??fflush( stdout );
> ?}
> ?return 0;
> }
>
> let's compile this to mycalc: gcc -o mycalc calc.c ... (untested code)
>
> In C I have this code?which starts the mycalc process and handles the output
> from it:
>
> #include <stdio.h>
> #include <assert.h>
> #define BUF_SIZE 256
>
> int main()
> {
> ?FILE *pip;
> ?char line[BUF_SIZE];
>
> ?pip = popen("mycalc", "r");
> ?assert( pip != NULL );
>
> ?while ( fgets( line, BUF_SIZE, pip )) {
> ??printf( "Hello; I got: %s \n",?line );
> ??fflush( stdout );
> ?}
> ?pclose( pip );
> ?return 0;
> }
> How can I make such while-loop?in Python? I assume I should use
> subprocess.Popen(), but I can't figure out how?

import subprocess
subprocess.call(["./mycalc"]) # add `bufsize=-1` as argument to have
output be buffered
#process inherits our filehandles and writes directly to them
#.call() only returns once the process has exited

Cheers,
Chris
-- 
http://blog.rebertia.com


From robert.kern at gmail.com  Thu May  7 18:57:04 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 07 May 2009 17:57:04 -0500
Subject: Python 2.4.3 array memory leak
In-Reply-To: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
References: <19f299bd-7a10-435e-b727-6f72bbf8ece9@l28g2000vba.googlegroups.com>
Message-ID: <gtvp02$ud9$1@ger.gmane.org>

On 2009-05-07 16:31, danmcleran at yahoo.com wrote:
> I am using the array module to instantiate many arrays in my
> application. It seems like there is a memory leak in there somewhere.
> Can anyone confim this and let me know what, if anything, I can do
> about it? I am using Fedora Core 5 Linux:
>
> import commands
> import array
> import itertools
> import sys
>
> from itertools import repeat
>
> print '*** before ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> for i in range(100):
>      a = array.array('I', repeat(0, int(2E6)))
>      del a
> print '*** after ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> Output:
> *** before ***
> MemFree:       1459772 kB
> *** after ***
> MemFree:       1457688 kB

This is not necessarily indicative of a memory leak, per se. Python sometimes 
does not release memory back to the OS. The memory isn't leaked; it will be 
reused by Python for later allocations. Now, if you saw Python's memory usage 
*grow* with increasing iterations, then that would be evidence of a leak.

Try measuring the "before" memory, then do one iteration, measure the memory 
again (let's call it "intermediate"), then do your loop, and then measure the 
"after" memory. The "intermediate" measurement should be about your "after" 
measurement.

Also, try to measure the process's own memory usage, not the system's free memory.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From piet at cs.uu.nl  Thu May  7 19:17:08 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 08 May 2009 01:17:08 +0200
Subject: SimpleXMLRPCServer and creating a new object on for each new
	client request.
References: <mailman.5173.1241647285.11746.python-list@python.org>
Message-ID: <m2ab5ojyff.fsf@cs.uu.nl>

>>>>> Jelle Smet <jelle at smetj.net> (JS) wrote:

One more thing:

>JS> I start python interactively:
>>>>> import xmlrpclib
>>>>> session1=xmlrpclib.ServerProxy('http://localhost:8000')
>>>>> session2=xmlrpclib.ServerProxy('http://localhost:8000')
>>>>> print session1.show_random()
>JS> 13930
>>>>> print session2.show_random()
>JS> 13930
>>>>> 

I get the impression, also from your use of the variable names
'session1' and 'session2' that xmlrpclib.ServerProxy() gives you some
kind of connection to the XMLRPC server. This is not the case. It gives
just an administration object *in the client* that will communicate with
the server when you call a method on it. The two session's in your code
are therefore functionally equivalent and there is no advantage in
having two of them instead of one. And the name session is misleading.

Please note also that XMLRPC isn't object-oriented. There is just the
server; in the protocol there are no objects other than the server.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From pavlovevidence at gmail.com  Thu May  7 19:35:32 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 7 May 2009 16:35:32 -0700 (PDT)
Subject: subprocess.Popen howto?
References: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net> 
	<mailman.5249.1241733498.11746.python-list@python.org>
Message-ID: <3aaa4e6e-c2c0-43e0-a483-7c79c46137a9@s16g2000vbp.googlegroups.com>

On May 7, 2:58?pm, norseman <norse... at hughes.net> wrote:
> If you don't like a lot of typing that obscures the process,
> take a look at os.Popen2 ?Pg.39 or so in Lib.pdf for 2.5.2
> In this case - the popen3 is probably your best bet.
>
> I took a test run on "subprocess" a few months ago. My review:
> excessive typing to accomplish the simple.


Hmm, I won't argue that it can be excessive typing, but I think its
purpose isn't to accomplish the simple but to hit all the corners of
subprocesses.

What if you want os.system without the shell?  What if you want popen
with the shell?  On Windows what if I want a subprocess without a
console from a Python program in a console.  Stuff like that.

I still use os.system for Q&D stuff, but now use subprocess for
everything else since I prefer thorough to short and sweet.


Carl Banks


From rajanikanth at gmail.com  Thu May  7 19:51:14 2009
From: rajanikanth at gmail.com (Rajanikanth Jammalamadaka)
Date: Thu, 7 May 2009 16:51:14 -0700
Subject: regular expression for getting content between parentheses
Message-ID: <84bdef3c0905071651p60232adagd98aa1138f91d4f9@mail.gmail.com>

Hi

I have a text file as follows:

testName = (
 someParam = value1
 anotherParam = (value2, value3)
)

how do I write a regular expression to get all the contents of the
file which are between the first and last parentheses.

In this case,  I want:

 someParam = value1
 anotherParam = (value2, value3)

Thanks,

Raj


From cripplemeal at gmail.com  Thu May  7 19:52:54 2009
From: cripplemeal at gmail.com (cripplemeal at gmail.com)
Date: Thu, 7 May 2009 16:52:54 -0700 (PDT)
Subject: Pygame
Message-ID: <bdbf3fd4-f524-4da9-ba9e-a8080104aec6@r3g2000vbp.googlegroups.com>

I am following this tutorial on python, and it has instructed me to
download pygame. I am not sure it works with the new version of python
I am using, as the last version it states on the tutorial is 2.6.

It is telling me the module does not exist after I download, and I
even tried placing it in the python folder, but it still came up with
a problem.

Any way to fix it, or do I try something else?


From clp2 at rebertia.com  Thu May  7 20:01:01 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 7 May 2009 17:01:01 -0700
Subject: Pygame
In-Reply-To: <bdbf3fd4-f524-4da9-ba9e-a8080104aec6@r3g2000vbp.googlegroups.com>
References: <bdbf3fd4-f524-4da9-ba9e-a8080104aec6@r3g2000vbp.googlegroups.com>
Message-ID: <50697b2c0905071701k5ad5480u332d5f7e211e71e7@mail.gmail.com>

On Thu, May 7, 2009 at 4:52 PM,  <cripplemeal at gmail.com> wrote:
> I am following this tutorial on python, and it has instructed me to
> download pygame. I am not sure it works with the new version of python
> I am using, as the last version it states on the tutorial is 2.6.
>
> It is telling me the module does not exist after I download, and I
> even tried placing it in the python folder, but it still came up with
> a problem.

Please give the actual full text of the error message (and traceback
if possible).
Please explain precisely which folder you mean by "the python folder".

Cheers,
Chris
-- 
http://blog.rebertia.com


From mensanator at aol.com  Thu May  7 20:04:05 2009
From: mensanator at aol.com (Mensanator)
Date: Thu, 7 May 2009 17:04:05 -0700 (PDT)
Subject: Pygame
References: <bdbf3fd4-f524-4da9-ba9e-a8080104aec6@r3g2000vbp.googlegroups.com>
Message-ID: <f9b26270-3f58-4386-be9e-007f877bbccb@b1g2000vbc.googlegroups.com>

On May 7, 6:52?pm, cripplem... at gmail.com wrote:
> I am following this tutorial on python, and it has instructed me to
> download pygame. I am not sure it works with the new version of python
> I am using, as the last version it states on the tutorial is 2.6.

If the module says 2.6, then that's the version you must use.

There's not much point in using 3.x until the 3rd party modules
catch up. Unless said modules are not important to you.

And even that's no guarantee. The sympy module writers just assumed
their code would work in 2.6 without testing it. Turns out they were
seriously wrong and had to scramble to make a bug fix.

>
> It is telling me the module does not exist after I download, and I
> even tried placing it in the python folder, but it still came up with
> a problem.
>
> Any way to fix it, or do I try something else?



From emile at fenx.com  Thu May  7 20:14:59 2009
From: emile at fenx.com (Emile van Sebille)
Date: Thu, 07 May 2009 17:14:59 -0700
Subject: regular expression for getting content between parentheses
In-Reply-To: <84bdef3c0905071651p60232adagd98aa1138f91d4f9@mail.gmail.com>
References: <84bdef3c0905071651p60232adagd98aa1138f91d4f9@mail.gmail.com>
Message-ID: <gtvteg$8gv$1@ger.gmane.org>

On 5/7/2009 4:51 PM Rajanikanth Jammalamadaka said...
> Hi
> 
> I have a text file as follows:
> 
> testName = (
>  someParam = value1
>  anotherParam = (value2, value3)
> )
> 
> how do I write a regular expression to get all the contents of the
> file which are between the first and last parentheses.
> 
> In this case,  I want:
> 
>  someParam = value1
>  anotherParam = (value2, value3)
> 
> Thanks,

It's not a regex nor probably what you want, but I'd start with...


 >>> filetext = '''testName = (
...  someParam = value1
...  anotherParam = (value2, value3)
... )'''
 >>>
 >>> print filetext.split("(",1)[-1].rsplit(")",1)[0]

  someParam = value1
  anotherParam = (value2, value3)

 >>>

Emile



From rhodri at wildebst.demon.co.uk  Thu May  7 20:19:21 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 08 May 2009 01:19:21 +0100
Subject: regular expression for getting content between parentheses
In-Reply-To: <84bdef3c0905071651p60232adagd98aa1138f91d4f9@mail.gmail.com>
References: <84bdef3c0905071651p60232adagd98aa1138f91d4f9@mail.gmail.com>
Message-ID: <op.utk4ijrda8ncjz@gnudebst>

On Fri, 08 May 2009 00:51:14 +0100, Rajanikanth Jammalamadaka  
<rajanikanth at gmail.com> wrote:

> Hi
>
> I have a text file as follows:
>
> testName = (
>  someParam = value1
>  anotherParam = (value2, value3)
> )
>
> how do I write a regular expression to get all the contents of the
> file which are between the first and last parentheses.

You don't, or at least you don't without some cast-iron guarantees
that your file will look *exactly* like this.  If you can guarantee
that, then this should work:

import re

f = open(filename)
data = f.read()
m = re.match(r"""[^(]*\(     # Find the first open parenthesis
                  (.*)        # Gobble up everything...
                  \)[^)]*$    # ...to the last close paren""",
              data, re.X)
if m:
   print m.group(1)


Notice that this will do *exactly* what you asked; pick up
everything between the first and the last parentheses.  In
particular, if your text looks like this:

testName1 = (
   someParam1 = value1
   anotherParam1 = (value2, value3)
)
testName2 = (
   sameParam2 = value4
)

...then what you'll get out is:

   someParam1 = value1
   anotherParam1 = (value2, value3)
)
testName2 = (
   sameParam2 = value4


You can't get around that with regular expressions, you'll
have to parse your way through the input string counting
open and close parentheses as you go.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From m.irfan.n84 at gmail.com  Thu May  7 20:21:20 2009
From: m.irfan.n84 at gmail.com (Irfan)
Date: Thu, 7 May 2009 17:21:20 -0700 (PDT)
Subject: Computer,Software and Laptops
Message-ID: <f32b1bdc-69c2-489a-acdd-c4499c1c7d8e@h23g2000vbc.googlegroups.com>

Get more information related about computers,laptops and software
visit
(http://in-computersandlaptops.blogspot.com)


From ross.jett at gmail.com  Thu May  7 20:32:22 2009
From: ross.jett at gmail.com (Ross)
Date: Thu, 7 May 2009 17:32:22 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com> 
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>
	<1d8802ff-8211-467f-95c1-4616e3bd7300@s20g2000vbp.googlegroups.com> 
	<b2cf45ed-d3da-4d93-883c-c8985d40ad55@r34g2000vba.googlegroups.com>
Message-ID: <ced68e15-bcac-4dc0-99a7-c58cbe5adc35@g20g2000vba.googlegroups.com>

On May 7, 1:11?am, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 7, 12:30?am, Ross <ross.j... at gmail.com> wrote:
>
>
>
> > If I were to set up a dictionary that counted players used in the bye
> > list and only allowed players to be added to the bye list if they were
> > within 2 of the least used player, would this be a good approach for
> > managing bye selection or would using a dictionary in this manner be
> > unnecessary/redundant?
>
> I certainly have not proved it, but I think you don't need to resort
> to anything fancy if you are OK with the maximum byes being within two
> of the minimum byes. ?(Maybe this needs to be larger with larger
> numbers of players.) ?Try using your original shuffle but instead of
> selecting matches to "throw away" each week, just use the matches you
> need (to fill up the courts) and pick up where you left off the next
> week. ?For example, with 10 players, each "round" ideally consists of
> five matches. ?If you only have four courts, don't throw away the
> fifth match; save it as the first match next week.
>
> To be honest, I didn't look too carefully at your original shuffle.
> It may be good enough. ?It's a little different than the "standard"
> rotation as presented on Wikipedia:
>
> ?http://en.wikipedia.org/wiki/Round-robin_tournament#Scheduling_algorithm
>
> The one on Wikipedia happened to pass my casual tests with no more
> than a 2-bye difference between the most-played and least-played
> players, and didn't run into the problem of scheduling the same player
> for two matches the same week. ?But I have to stress I only tried a
> few starting values, which all worked; I didn't try to break it, or
> run an extensive battery of tests.
>
> John

John,
   I really appreciate your help with this problem. Thanks to your
suggestions, I've managed to solve the problem. Here's what I did: I
used my original round_robin generator to generate each week. I then
took every week and chained them all together end to end. Then,
depending on how many courts are available, I can select that many
tuples at a time from the list. If you go in order, the discrepancy
between the player with the least amount of byes and the greatest
amount of byes is only 1. If you can make it exactly all the way
through a cycle, there will be no discrepancy. Anyways, I've done all
this by hand and it works so now I'm going to go ahead and code it up.
Again, thanks for your help.

-Ross


From davea at ieee.org  Thu May  7 20:32:48 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 07 May 2009 20:32:48 -0400
Subject: Pygame
In-Reply-To: <bdbf3fd4-f524-4da9-ba9e-a8080104aec6@r3g2000vbp.googlegroups.com>
References: <bdbf3fd4-f524-4da9-ba9e-a8080104aec6@r3g2000vbp.googlegroups.com>
Message-ID: <4A037DB0.9070901@ieee.org>

cripplemeal at gmail.com wrote:
> I am following this tutorial on python, and it has instructed me to
> download pygame. I am not sure it works with the new version of python
> I am using,
and what version would that be?  What release, and what platform?  print 
sys.version and include the output in your next message.
>  as the last version it states on the tutorial is 2.6.
>
> It is telling me the module 

what module?  Copy & paste the error message into your query, and you're 
likely to get useful response.  Also copy & paste the command you're 
issuing to cause this error message.
> does not exist after I download, 

Then your download manager is complaining about a missing module?
> and I
> even tried placing it in the python folder, 
which "python folder".   Be specific.  Do you mean the folder that 
contains Python.exe? And just what are you "placing" there?
> but it still came up with
> a problem.
>   
A new problem?  Be specific.
> Any way to fix it, or do I try something else?
>
>   
Wild guess - maybe it's complaining about a missing SDL module.  PyGame 
is dependent on SDL, as far as I can tell.

Also, see http://www.pygame.org/download.shtml    If you're on Windows, 
PyGame has different versions for different versions of Python.  This 
page recommends Python 2.5.4.  And there isn't a version for Python 3.0



From aahz at pythoncraft.com  Thu May  7 20:55:03 2009
From: aahz at pythoncraft.com (Aahz)
Date: 7 May 2009 17:55:03 -0700
Subject: IIR filter conversion routines for Python?
References: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>
Message-ID: <gtvvt7$ml6$1@panix3.panix.com>

In article <af91e679-e8cf-4db5-9c88-6436e520ce4e at z7g2000vbh.googlegroups.com>,
wzab  <wzab01 at gmail.com> wrote:
>
>I'm looking for procedures converting the IIR filters into cascade and/
>or parallel forms. Something like dir2cas.m or dir2par.m known in the
>Matlab/Octave world.
>Unfortunately SciPy does not contain such functions.
>If they are not available, I would be grateful for any hints helping
>me to implement them myself.

Even though they're not in SciPy, the mailing lists for NumPy/SciPY are
probably good places to get advice.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From gnewsg at gmail.com  Thu May  7 21:12:44 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Thu, 7 May 2009 18:12:44 -0700 (PDT)
Subject: Call a function when a thread exits
Message-ID: <5664df89-2966-45e4-a959-f4fc85c2e50f@g20g2000vba.googlegroups.com>

Hi,
I'm searching for a smooth way to call a certain function when a
thread has finished its job.
I guess I can keep calling isAlive() in a loop and call my function
when it returns False but it's not very elegant.
Actually I'm a bit surprised it doesn't exists an "atexit" function.
Something like:

import threading, time

def myfun():
    time.sleep(1)
    print "hello"

def cleanup():
    print "thread finished, starting cleanup operations..."

t = threading.Thread(target=myfun)
t.atexit(target=cleanup)
t.start()


Is there a reason why there's no such thing in the threading module?


--- Giampaolo
http://code.google.com/p/pyftpdlib/


From rajanikanth at gmail.com  Thu May  7 21:25:39 2009
From: rajanikanth at gmail.com (Rajanikanth Jammalamadaka)
Date: Thu, 7 May 2009 18:25:39 -0700
Subject: regular expression for getting content between parentheses
In-Reply-To: <op.utk4ijrda8ncjz@gnudebst>
References: <84bdef3c0905071651p60232adagd98aa1138f91d4f9@mail.gmail.com>
	<op.utk4ijrda8ncjz@gnudebst>
Message-ID: <84bdef3c0905071825r523ed786g4a5d03e893cc924a@mail.gmail.com>

Thanks for your replies.

I changed the file to look like this:


{ testName : {"someParam": "value1", "anotherParam": (value2, value3)},
}

to make it look like a hash to Python.

Thanks,

Raj

On Thu, May 7, 2009 at 5:19 PM, Rhodri James
<rhodri at wildebst.demon.co.uk> wrote:
> On Fri, 08 May 2009 00:51:14 +0100, Rajanikanth Jammalamadaka
> <rajanikanth at gmail.com> wrote:
>
>> Hi
>>
>> I have a text file as follows:
>>
>> testName = (
>> ?someParam = value1
>> ?anotherParam = (value2, value3)
>> )
>>
>> how do I write a regular expression to get all the contents of the
>> file which are between the first and last parentheses.
>
> You don't, or at least you don't without some cast-iron guarantees
> that your file will look *exactly* like this. ?If you can guarantee
> that, then this should work:
>
> import re
>
> f = open(filename)
> data = f.read()
> m = re.match(r"""[^(]*\( ? ? # Find the first open parenthesis
> ? ? ? ? ? ? ? ? (.*) ? ? ? ?# Gobble up everything...
> ? ? ? ? ? ? ? ? \)[^)]*$ ? ?# ...to the last close paren""",
> ? ? ? ? ? ? data, re.X)
> if m:
> ?print m.group(1)
>
>
> Notice that this will do *exactly* what you asked; pick up
> everything between the first and the last parentheses. ?In
> particular, if your text looks like this:
>
> testName1 = (
> ?someParam1 = value1
> ?anotherParam1 = (value2, value3)
> )
> testName2 = (
> ?sameParam2 = value4
> )
>
> ...then what you'll get out is:
>
> ?someParam1 = value1
> ?anotherParam1 = (value2, value3)
> )
> testName2 = (
> ?sameParam2 = value4
>
>
> You can't get around that with regular expressions, you'll
> have to parse your way through the input string counting
> open and close parentheses as you go.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Rajanikanth


From pavlovevidence at gmail.com  Thu May  7 21:33:38 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 7 May 2009 18:33:38 -0700 (PDT)
Subject: Call a function when a thread exits
References: <5664df89-2966-45e4-a959-f4fc85c2e50f@g20g2000vba.googlegroups.com>
Message-ID: <eb595814-19c9-44f1-a1de-9c313b0adc18@s31g2000vbp.googlegroups.com>

On May 7, 6:12?pm, "Giampaolo Rodola'" <gne... at gmail.com> wrote:
> Hi,
> I'm searching for a smooth way to call a certain function when a
> thread has finished its job.
> I guess I can keep calling isAlive() in a loop and call my function
> when it returns False but it's not very elegant.
> Actually I'm a bit surprised it doesn't exists an "atexit" function.
> Something like:
>
> import threading, time
>
> def myfun():
> ? ? time.sleep(1)
> ? ? print "hello"
>
> def cleanup():
> ? ? print "thread finished, starting cleanup operations..."
>
> t = threading.Thread(target=myfun)
> t.atexit(target=cleanup)
> t.start()
>
> Is there a reason why there's no such thing in the threading module?

You can define your target function to clean up on exit.  Using your
definitions of myfun and cleanup,

def mycleanfun():
    try:
        myfun()
    finally:
        cleanup()

t = threading.Thread(target=mycleanfun)
t.start()


Carl Banks


From baseelinger at yahoo.com  Thu May  7 21:52:01 2009
From: baseelinger at yahoo.com (baseelinger at yahoo.com)
Date: Thu, 7 May 2009 18:52:01 -0700 (PDT)
Subject: Web Based Front End?
Message-ID: <18804639-32ae-4bdf-9ecc-4c8b21f8a43f@g19g2000vbi.googlegroups.com>

I have been using Python for several years now and although my main
occupation is not directly related to writing code I have been able to
use Python to accomplish writing complex configuration files and
analyzing data against standards, etc.  I now have a requirement to
provide a web based interface rather than say using the IDLE GUI for
several reasons, (allowing others to use a server based Python script
and to provide a slicker user interface via the users web browser).

As I wade into very new territory I see articles on PHP, mod_python,
Python Server Pages, CGI, Zope, Python in PHP, CherryPy, Pylons, etc.,
etc.  It's all pretty confusing and while one method may work to
accomplish the task at hand someone with far greater experience may
look at the situation and say, "um, yeah, it will work that way but it
would have been a whole lot easier if you had done it this way...".

So, my question is what is the best method to be able to have a user
enter specific data on a web page, have that data be passed to the
Python script and then have the output returned to the web page?
Essentially, I want to use a web based front end to accomplish the
same thing that the IDLE GUI does, (asks me a few questions, I answer
them, it builds a configuration file and prints it to the screen).

A basic example can be found at http://webpython.codepoint.net/wsgi_request_parsing_post
using httpd in Python but its seems very basic.

Can anyone point me in the right direction?  Thanks in advance for any
assistance you may be able to provide.


From gallium.arsenide at gmail.com  Thu May  7 22:00:20 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Thu, 7 May 2009 19:00:20 -0700 (PDT)
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com> 
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com> 
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com> 
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com> 
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com> 
	<mailman.5143.1241594966.11746.python-list@python.org>
	<a629ef23-0841-4602-b4c7-8345f5c12bf6@s28g2000vbp.googlegroups.com>
	<1d8802ff-8211-467f-95c1-4616e3bd7300@s20g2000vbp.googlegroups.com> 
	<b2cf45ed-d3da-4d93-883c-c8985d40ad55@r34g2000vba.googlegroups.com> 
	<ced68e15-bcac-4dc0-99a7-c58cbe5adc35@g20g2000vba.googlegroups.com>
Message-ID: <0226fb35-a21e-4ba8-bafd-71af8abbd459@p4g2000vba.googlegroups.com>

On May 7, 8:32?pm, Ross <ross.j... at gmail.com> wrote:
> I've managed to solve the problem. If you go in
> order, the discrepancy between the player with the
> least amount of byes and the greatest amount of byes
> is only 1.

I don't mean to rain on your parade, but that's not the case for all
values.  For example, with 7 players and only 1 or 2 courts, there
will be weeks in the middle where the bye-difference is 2.

This behavior is present in both your shuffle and the standard one in
Wikipedia.

Ultimately, as it pertains to your physical tennis scheduling with
actual courts and actual players, you may never encounter the
imbalance.  But as a math problem, it's still not solved.  (Someone
may have solved it or proved it insoluble, but obviously I am not
aware of such a proof, because otherwise I would have presented it
already.)

John


From lepto.python at gmail.com  Thu May  7 22:27:08 2009
From: lepto.python at gmail.com (oyster)
Date: Fri, 8 May 2009 10:27:08 +0800
Subject: free chart lib for Python?
Message-ID: <6a4f17690905071927u56bc48b9k51cb55af693b685f@mail.gmail.com>

I mean chart, not plot. If you don't know the difference, you can
check www.advsofteng.com, which is a commercial program

is there such a thing with many kinds of chart, i.e. pie-chart,
line-chart, ......?

A long time ago, I programmed a rmchart interface, however rmchart is
windows only, and www.rmchart.com disappeared now

See you


From srikrishnamohan at gmail.com  Thu May  7 22:32:37 2009
From: srikrishnamohan at gmail.com (km)
Date: Fri, 8 May 2009 11:32:37 +0900
Subject: update python version
Message-ID: <f4cc03640905071932n55999edeyf5546f35b0e45595@mail.gmail.com>

Hi all,

Is there a way to update python 2.6.1 to 2.6.2  using easy_install ?

thanks,
regards,
KM
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From sjmachin at lexicon.net  Thu May  7 22:42:04 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 7 May 2009 19:42:04 -0700 (PDT)
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
Message-ID: <b18d492d-7fd5-4ce9-ba4d-c39cf598afd6@u39g2000pru.googlegroups.com>

On May 8, 1:45?am, Nick <nic... at gmail.com> wrote:
> On May 5, 8:27?pm, Tim Golden <m... at timgolden.me.uk> wrote:
>
>
>
> > Nick wrote:
> > > Part of the problem is that the 'selection' needs to be in a config
> > > file. I can put the if row['status'] != 'Cancelled': return True into
> > > a config, read it and eval it, but its not quite as clean as ansql
> > > route.
>
> > Still not clear what the restriction is. If you were writingSQLyou'd have to read *something* from your config file,
> > unless you're suggesting that the "config file" is in fact
> > aSQLfile. Which is one way of doing it, but then you might
> > just as well have your config file as a Python file and
> > import it.
>
> > Have I missed the point somewhere here? Can you give an
> > example -- even a fictional one -- of what you couldn't
> > do using, say, the example I gave earlier?
>
> > TJG
>
> Solution found. In the end I used SQLite to read from a csv file, and
> now I can query the CSV file. The file is read using the csv module
>
> First create a function
>
> def fraction(p, denom):
> ? ? num, frac = p.split ('-')
> ? ? return float (num) + float (frac) / denom
>
> for use within queries.
>
> Now build the class.
>
> ? ? ? ? self.filename ?= filename
> ? ? ? ? self.dialect ? = dialect
> ? ? ? ? self.query ? ? = query
> ? ? ? ? reader = csv.reader (open (filename, 'r'))
> ? ? ? ? self.connection = sqlite.connect(":memory:")
> ? ? ? ? self.connection.create_function("fraction", 2, fraction) #
> Adds in function
> ? ? ? ? self.cursor = self.connection.cursor()
> ? ? ? ? first = True
> ? ? ? ? for row in reader:
> ? ? ? ? ? ? if first:
> ? ? ? ? ? ? ? ? headers = []
> ? ? ? ? ? ? ? ? for r in row:
> ? ? ? ? ? ? ? ? ? ? n = r.strip().replace (' ', '_').replace ('-','_')
> ? ? ? ? ? ? ? ? ? ? headers.append (n)
> ? ? ? ? ? ? ? ? command = 'create table csv (%s)' % ','.join (headers)
> ? ? ? ? ? ? ? ? self.cursor.execute (command)
> ? ? ? ? ? ? ? ? first = False
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? command = 'insert into csv values ("%s")' % '","'.join
> (row)
> ? ? ? ? ? ? ? ? self.cursor.execute (command)
>
> and then I can use this
>
> ? ? ? ? self.cursor.execute (self.query)
> ? ? ? ? rows = self.cursor.fetchall()
> ? ? ? ? headers = []
> ? ? ? ? for r in self.cursor.description:
> ? ? ? ? ? ? headers.append (r[0])
> ? ? ? ? results = Results.Results (headers, self.name, {})
> ? ? ? ? i = 0
> ? ? ? ? for row in rows:
> ? ? ? ? ? ? results.add (row, i)
> ? ? ? ? ? ? i = i + 1
> ? ? ? ? return results
>
> to query the results.
>
> Results.Results is one of my classes that's reused in lots of places.
>
> The query then looks somethign like this
>
> ? ? ? ? ? ? ? ? select
> ? ? ? ? ? ? ? ? ? ? Client_Reference_Number as TrdNbr,
> ? ? ? ? ? ? ? ? ? ? Asset_Number as ISIN,
> ? ? ? ? ? ? ? ? ? ? Quantity as Qty,
> ? ? ? ? ? ? ? ? ? ? status
> ? ? ? ? ? ? ? ? from
> ? ? ? ? ? ? ? ? ? ? csv

The remaining lines of your SELECT statement are incredibly redundant
AFAICT. It seems you have pushed the contents of your csv file into a
data base and pulled them ALL out again ... not what I'd call a
"query". What's the point?


> ? ? ? ? ? ? ? ? where status in ("CANCELLED")
>
> ? ? ? ? ? ? ? ? union
>
> ? ? ? ? ? ? ? ? select
> ? ? ? ? ? ? ? ? ? ? Client_Reference_Number as TrdNbr,
> ? ? ? ? ? ? ? ? ? ? Asset_Number as ISIN,
> ? ? ? ? ? ? ? ? ? ? Quantity as Qty,
> ? ? ? ? ? ? ? ? ? ? status
> ? ? ? ? ? ? ? ? from
> ? ? ? ? ? ? ? ? ? ? csv
> ? ? ? ? ? ? ? ? where status not in ("CANCELLED")
>
> All incredibly neat and the first time I've used SQLite.
>
> nick



From davecook at nowhere.net  Thu May  7 22:45:12 2009
From: davecook at nowhere.net (David Cook)
Date: 08 May 2009 02:45:12 GMT
Subject: Which one is best Python or Java for developing GUI applications?
References: <mailman.5092.1241505670.11746.python-list@python.org>
Message-ID: <4a039cb8$0$32213$c3e8da3@news.astraweb.com>

On 2009-05-05, srinivasan srinivas <sri_annauni at yahoo.co.in> wrote:
 
> Could you tell me does Python have any advantages over Java for the
> development of GUI applications?

You don't have to choose between them.  You can program Swing applications
in Jython.  And Jython is just a jar that you can bundle in another jar for
distribution just like any other Java jar.  You will have to understand Java
code to learn Swing, though.  I suggest also looking into the
Swing Application Framework and Netbeans.

However, I would look at PyQt first (if the license requirements are OK).
PyQT is well thought out, consistent, and featureful.  And then maybe try
wxPython if you need a more liberal license.  wxPython is clunky and
inconsistent, but gets the job done.

Dave Cook


From wuwei23 at gmail.com  Thu May  7 23:32:18 2009
From: wuwei23 at gmail.com (alex23)
Date: Thu, 7 May 2009 20:32:18 -0700 (PDT)
Subject: free chart lib for Python?
References: <mailman.5263.1241750053.11746.python-list@python.org>
Message-ID: <6d770dc1-6efa-4535-a16d-55667591c328@j18g2000prm.googlegroups.com>

On May 8, 12:27?pm, oyster <lepto.pyt... at gmail.com> wrote:
> is there such a thing with many kinds of chart, i.e. pie-chart,
> line-chart, ......?

The best place to look is PyPI, there are several possible candidates
there:
http://pypi.python.org/pypi?%3Aaction=search&term=charts&submit=search

I've had a lot of success with the Python Google Chart module:
http://pygooglechart.slowchop.com/


From jjposner at snet.net  Thu May  7 23:56:48 2009
From: jjposner at snet.net (John Posner)
Date: Thu, 07 May 2009 23:56:48 -0400
Subject: tkinter and widget placement after resizing
In-Reply-To: <bfc1d96a-3ea3-4bd8-a06a-afb352e608c8@l5g2000vbc.googlegroups.com>
References: <bfc1d96a-3ea3-4bd8-a06a-afb352e608c8@l5g2000vbc.googlegroups.com>
Message-ID: <4A03AD80.7050905@snet.net>

jamieson wrote:
> i.e. start out with a window like this:
>
> [1][4][7]
> [2][5][8]
> [3][6][9]
>
>
> make the main window larger and end up with this:
>
> [1][6]
> [2][7]
> [3][8]
> [4][9]
> [5

Here's a solution, using Label widgets for clarity. The keys are:

* start numbering from zero, not one
* use divmod() on an item's index within the list to determine the 
item's column/row position
* bind the <Configure> event for window resizing

# redo_layout.py

import sys
from Tkinter import *

CHAR_WIDTH = 10
PAD = 3
INIT_COL_COUNT = 3

def grid_positions(count, numcols):
    """
    return a generator for (colnum, rownum) position tuples,
    given the total number of items and the number of columns

    the first column is filled with items, then the second, etc.
    """
    numrows, rem = divmod(count, numcols)
    # need an extra row if there was a remainder
    if rem:
        numrows += 1

    # return value is a generator
    return ( divmod(i, numrows) for i in range(count) )

def place_labels(event):
    """
    reposition all the items in the sequence "label_list"
    """
    # assumption: all labels have same width
    label_width = label_list[0].winfo_width()
    window_width = frm.winfo_width()

    # calculate new column count
    new_col_count = window_width // (label_width+PAD)

    # get new position iterator
    pos_iter = grid_positions(LABEL_COUNT, new_col_count)

    # redo layout
    for lab in label_list:
        lab.grid_forget()
        colnum, rownum = pos_iter.next()
        lab.grid(column=colnum, row=rownum, padx=PAD, pady=PAD)

def create_labels(count):
    """
    create a list of Label items,
    with text "1", "2", etc.
    """
    return [ Label(frm, bg='cyan', width=CHAR_WIDTH, text="%d" % i)
             for i in range(count) ]

if __name__ == "__main__":
    try:
        LABEL_COUNT = int(sys.argv[1])
    except (ValueError, IndexError):
        print "ERROR: Must specify number of labels"
        sys.exit(1)

    # Tkinter window and whole-window Frame
    root = Tk()
    frm = Frame(root)
    frm.pack(expand=True, fill=BOTH)

    # create some labels
    label_list = create_labels(LABEL_COUNT)

    # perform initial layout
    pos_iter = grid_positions(LABEL_COUNT, INIT_COL_COUNT)
    for lab in label_list:
        coloff, rowoff = pos_iter.next()
        lab.grid(column=coloff, row=rowoff, padx=PAD, pady=PAD)
    del pos_iter

    # event configuration: redo the layout when the window size changes
    frm.bind('<Configure>', place_labels)

    # go
    root.mainloop()



From clp2 at rebertia.com  Fri May  8 00:48:43 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 7 May 2009 21:48:43 -0700
Subject: heapq.merge with key=
In-Reply-To: <gtvjgk$tm8$1@foggy.unx.sas.com>
References: <gtvjgk$tm8$1@foggy.unx.sas.com>
Message-ID: <50697b2c0905072148n6e126fb8l91bf049cdbe451ec@mail.gmail.com>

On Thu, May 7, 2009 at 2:23 PM, Kevin D. Smith <Kevin.Smith at sas.com> wrote:
> I need the behavior of heapq.merge to merge a bunch of results from a
> database. ?I was doing this with sorted(itertools.chain(...), key=...), but
> I would prefer to do this with generators. ?My issue is that I need the key=
> argument to sort on the correct field in the database. ?heapq.merge doesn't
> have this argument and I don't understand the code enough to know if it's
> possible to add it. ?Is this enhancement possible without drastically
> changing the current code?

I think so. Completely untested code:

def key(ob):
    #code here

class Keyed(object):
    def __init__(self, obj):
        self.obj = obj
    def __cmp__(self, other):
        return cmp(key(self.obj), key(other.obj))

def keyify(gen):
    for item in gen:
        yield Keyed(item)

def stripify(gen):
    for keyed in gen:
        yield keyed.obj

merged = stripify(merge(keyify(A), keyify(B), keyify(C))) #A,B,C being
the iterables


Cheers,
Chris
-- 
http://blog.rebertia.com


From ganesh.gbg at gmail.com  Fri May  8 00:51:36 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Thu, 7 May 2009 21:51:36 -0700 (PDT)
Subject: About twisted.mail.smtp.SMTPDeliveryError
Message-ID: <8bb91b91-c00d-48d1-8b64-6f4765754e1c@d19g2000prh.googlegroups.com>

hi group,
I wrote a code as below


from twisted.mail.smtp import sendmail
from twisted.internet import reactor
from twisted.python.log import err
import time

MAILSERVER = 'mail.xxx.com'
listTo = ['gxxxxxx at gmail.com', 'gjangoxxxxx.py at gmail.com',
'lxxxxt at yahoo.co.in', 'gk1xx at gmail.com']
FROM = 'ganeshxx at .....com'
MSGBODY = "hi this final test"
a= time.time()
done = sendmail(MAILSERVER, FROM, listTo,
MSGBODY ,senderDomainName=None, port=25)
done.addErrback(err)
done.addCallback(lambda ignored: reactor.stop())
reactor.run()
print "Took %s seconds" %str(time.time()-a)



it showed me a error
like

"Failure: twisted.mail.smtp.SMTPDeliveryError: 554 No recipients
accepted"
and
"Relay access denied" errors

Is this error is because, i haven't
authenticated my email account to send mail.
Is so , having  username and password of smpt server ,how to
authenticate in
Twisted Framework

Thanks


From li.wang.d at gmail.com  Fri May  8 01:04:34 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 8 May 2009 15:04:34 +1000
Subject: Python 2.6, File read() problems in Windows Xp
Message-ID: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>

Hi all:

I am trying to read a non-text file as a string by using Python
read(), however, it seems there is some thing wrong with it. I can use
read() on text file correctly, but unable to read .xls file correctly.
(The program can read any file correctly in Fedora 10)

Any idea how to solve this problem?

Thank you very much!

-- 
Li
------
Time is all we have
and you may find one day
you have less than you think


From clp2 at rebertia.com  Fri May  8 01:38:10 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 7 May 2009 22:38:10 -0700
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
Message-ID: <50697b2c0905072238o6a00fc07ibc92423926313131@mail.gmail.com>

On Thu, May 7, 2009 at 10:04 PM, Li Wang <li.wang.d at gmail.com> wrote:
> Hi all:
>
> I am trying to read a non-text file as a string by using Python
> read(), however, it seems there is some thing wrong with it. I can use
> read() on text file correctly, but unable to read .xls file correctly.
> (The program can read any file correctly in Fedora 10)
>
> Any idea how to solve this problem?

You need to add a "b" to the `flags` argument to open() when you open
the file, e.g. open("the_file.xls", "rb")
Unlike *nix, Windows differentiates between binary and text files,
hence the need for the "b" flag to specify which you're dealing with.

Further info: http://docs.python.org/library/functions.html#open

Cheers,
Chris
-- 
http://blog.rebertia.com


From dchandran1 at yahoo.com  Fri May  8 02:05:36 2009
From: dchandran1 at yahoo.com (Deepak Chandran)
Date: Thu, 7 May 2009 23:05:36 -0700 (PDT)
Subject: configuring python with disable-thread in Ubuntu
Message-ID: <968094.67933.qm@web110411.mail.gq1.yahoo.com>

Hello, 

I am embedding python inside a C++ program. For some reason (I think libxml2), I am getting Segmentation fault at PyThread_release_lock. 

The solution I found online was to configure python with --disable-thread.

I used "apt-get install python-dev" to install python. 
How do I re-configure it using the --disable-thread option?

Thanks.


      
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From list at qtrac.plus.com  Fri May  8 02:37:03 2009
From: list at qtrac.plus.com (Mark Summerfield)
Date: Thu, 7 May 2009 23:37:03 -0700 (PDT)
Subject: Public attributes with really private data
Message-ID: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>

Hi,

I had a quick search & didn't find anything _nice_ that produced
attributes with really private data, so I came up with a possible
solution---for Python 3.
(For Python 2 there does seem to be an approach although I'm not
keen on it:
http://www.builderau.com.au/blogs/byteclub/viewblogpost.htm?p=339270875
)

Here's a standard class with one read-only and one writable
property that has a tiny bit of validation.

class P:
    def __init__(self, w):
        self.w = w
    @property
    def r(self): return 5
    @property
    def w(self): return self.__w
    @w.setter
    def w(self, value):
        if value > 0: # Only +ve values allowed
            self.__w = value
        else:
            raise ValueError("'{0}' is not valid for w".format(value))

The read-only property is completely private because it isn't
actually stored as such.

But if we do dir() on an instance, in addition to 'r' and 'w', we
also have '_P__w'. So the writable property's data is easily
accessible, and the validation can be got around:

>>> p = P(9)
>>> p.r, p.w
(5, 9)
>>> p.w = 43
>>> p.r, p.w
(5, 43)
>>> p.w = -7
Traceback (most recent call last):
...
ValueError: '-7' is not valid for w
>>> p._P__w = -7
>>> p.r, p.w
(5, -7)

Here's a class where I can't think of a way to access the private
data and set invalid values.

class A:
    r = Attribute("r", 5)
    w = Attribute("w", None, lambda self, value: value > 0)
    def __init__(self, w):
        self.w = w

The Attribute class is a descriptor that takes three arguments:
name of attribute, initial value (essential for read-only
attributes!), and a validator function (which could be "lambda
*a: True" if any value is accepatble).

>>> a = A(9)
>>> a.r, a.w
(5, 9)
>>> a.w = 43
>>> a.r, a.w
(5, 43)
>>> a.w = -7
Traceback (most recent call last):
...
ValueError: '-7' is not valid for w

If we do a dir(a) the only attributes we get (beyond those from
object) are 'r' and 'w', so it shouldn't be possible to get
around the validation---at least not easily.

Here's a rough & ready implementation of the Attribute class:

class Attribute:
    def __init__(self, name, first_value=None, validator=None):
        self.__name__ = name
        hidden_value = first_value
        self.__getter = lambda self: hidden_value
        if validator is not None:
            def set(self, value):
                if validator(self, value):
                    nonlocal hidden_value
                    hidden_value = value
                else:
                    raise ValueError("'{0}' is not valid for
{1}".format(value, name))
            self.__setter = set
        else:
            self.__setter = None
    def __get__(self, instance, owner=None):
        if instance is None:
            return self
        return self.__getter(instance)
    def __set__(self, instance, value):
        if self.__setter is None:
            raise AttributeError("'{0}' is read-only".format(
                                 self.__name__))
        return self.__setter(instance, value)

The key to making the attribute data private is that it is held
as part of a closure's state. Notice that nonlocal is needed,
so you need Python 3.

--
Mark Summerfield, Qtrac Ltd, www.qtrac.eu
    C++, Python, Qt, PyQt - training and consultancy
	"Programming in Python 3" - ISBN 0137129297


From gjango.py at gmail.com  Fri May  8 02:37:27 2009
From: gjango.py at gmail.com (guptha)
Date: Thu, 7 May 2009 23:37:27 -0700 (PDT)
Subject: Simple programme - Just want to know whether this is correct way of 
	coding
Message-ID: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>

Hi group,
This is my first programme in python ,I need to know whether my code
is in the right path of performance

I wrote a code using multithreading to send mails

FROM = '....com'

SUBJECT = 'This is the subject'
MSGBODY = 'This the body of the message '
MAILSERVER = 'mail....com'
port = 25
username = 'username'
password = 'pass'

# trim the strings of any leading or trailing spaces
FROM = FROM.strip()
SUBJECT = SUBJECT.strip()
MSGBODY = MSGBODY.strip()
MAILSERVER = MAILSERVER.strip()
username = username.strip()
password = password.strip()


# set up email parameters
msg = MIMEMultipart()
msg['From'] = FROM
msg['Subject'] = SUBJECT

#--------------------------------------------------
print "Starting Multi Thread Method"

class MyThread(Thread):

    def __init__(self, site,  FROM, MSGBODY):
        Thread.__init__(self)
        self.site = site
	self.FROM=FROM
	self.MSGBODY=MSGBODY

    def run(self):
	#Connect to server
	print 'Connecting to mail server ', MAILSERVER
	try:
		s = smtplib.SMTP(MAILSERVER,port)
		print 'connected'
	#s.set_debuglevel(1)
	except:
		print 'ERROR: Unable to connect to mail server', sys.exc_info	()[0]
	 	sys.exit(1)

	#login to server
	if password <> '':
		print 'Logging into mail server'
		try:
			s.login(username,password)
		except:
			print 'ERROR: Unable to login to mail server', MAILSERVER
			print 'Please recheck your password'
			sys.exit(1)
	print "running for %s " %self.site
	print s
	s.sendmail(self.FROM, self.site, self.MSGBODY)
	print "from %s" %self.FROM
	print "msg %s" %self.MSGBODY
 	print "Emailed for  site %s" %self.site
	s.quit()
	s.close()


a= time.time()
threads = []

for site in listTo:
    T = MyThread(site,FROM,MSGBODY)
    threads.append(T)
    T.start()


for i in threads:
    i.join()

print "Took %s seconds" %str(time.time()-a)

#-----------------------------------------------------

The code Works fine ,but I doubt about the performance issue ,My
intention is to send mails concurrently to large number of mail.
1.For every mail id i send It creates a new SMTP object,in case, if i
send to 1000 or more ids
      a) It obliviously creates that much SMPT connections ,is this a
right approach .
Thanks in Advance


From gh at ghaering.de  Fri May  8 02:40:40 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Fri, 08 May 2009 08:40:40 +0200
Subject: configuring python with disable-thread in Ubuntu
In-Reply-To: <968094.67933.qm@web110411.mail.gq1.yahoo.com>
References: <968094.67933.qm@web110411.mail.gq1.yahoo.com>
Message-ID: <gu0k58$is9$1@ger.gmane.org>

Deepak Chandran wrote:
> Hello, 
> 
> I am embedding python inside a C++ program. For some reason (I think
> libxml2), I am getting Segmentation fault at PyThread_release_lock. 
> 
> The solution I found online was to configure python with --disable-thread.

That doesn't sound like a solution, but like a kludge.

> I used "apt-get install python-dev" to install python. 
> How do I re-configure it using the --disable-thread option?

You don't want your system Python to be built with "--disable-thread".
Other utilities might depend on threads being available in Python.

If you really want to go this route, download Python from python.org and
build it from source with the required options to "./configure".

-- Gerhard



From shstein2002 at yahoo.com  Fri May  8 02:42:35 2009
From: shstein2002 at yahoo.com (shstein2002 at yahoo.com)
Date: Thu, 7 May 2009 23:42:35 -0700 (PDT)
Subject: scrolledtext widget error?
Message-ID: <02b12656-f849-4856-bfe5-fdf3b926577f@j18g2000prm.googlegroups.com>

I wrote a twitter client which writes the statuses into a ScrolledText
widget, but it rarely gives a error that I can't nail down. The code
is:

twitwin.scrolled.config(state=NORMAL)
twitwin.scrolled.delete("1.0", END)
evens = True
_.links = []
for x in _.parser.tweets:
    start = _.scrolled.index(INSERT)
    print "start = ",start
    _.scrolled.insert(END, x['screen_name']+" ", ("bold",))
    txt = _.whitere.sub(" ",x['text'])  #the text with whitespace
compressed
    islink = False
    for y in _.urlre.split(txt):  #handle urls
        if y != "":
            if islink:
                a = _.scrolled.index(INSERT)
                _.scrolled.insert(END, y)#, ("link",))
                b = _.scrolled.index(INSERT)
                _.scrolled.tag_add("link", a, b)
                _.scrolled.tag_add("href%d"%len(_.links), a, b)
                _.links.append((a,b,y))  #save url info and position
in the widget
            else:
                _.scrolled.insert(END, y)
        islink = not islink
    _.scrolled.insert(END, "\n")
    if evens:
        _.scrolled.tag_add("light", start, END)  #alternating
background colors
    else:
        _.scrolled.tag_add("dark", start, END)
    evens = not evens
twitwin.scrolled.config(state=DISABLED)

The print statement usually prints a valid index, but rarely prints
"start=None" and it crashes. Should I be using something other than
INSERT or another method here?

Thanks in advance,
-- Rick


From gh at ghaering.de  Fri May  8 02:42:44 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Fri, 08 May 2009 08:42:44 +0200
Subject: update python version
In-Reply-To: <f4cc03640905071932n55999edeyf5546f35b0e45595@mail.gmail.com>
References: <f4cc03640905071932n55999edeyf5546f35b0e45595@mail.gmail.com>
Message-ID: <gu0k94$is9$2@ger.gmane.org>

km wrote:
> Hi all,
> 
> Is there a way to update python 2.6.1 to 2.6.2  using easy_install ?

No, easy_install installs Python packages. It doesn't upgrade Python
itself. If this is Windows, just install the newer Python version. No
need to uninstall the 2.6.1 first.

If this is some Unix variant, hopefully they will provide updated Python
 packages soon.

-- Gerhard



From texaomruzj at hotmail.com  Fri May  8 02:52:43 2009
From: texaomruzj at hotmail.com (texaomruzj at hotmail.com)
Date: Thu, 7 May 2009 23:52:43 -0700 (PDT)
Subject: =?Big5?B?qMisd6aopEi8dq21q7A=?=
Message-ID: <3b546c4b-3808-423d-ab62-d63856df045e@n7g2000prc.googlegroups.com>

<font color=red>????!!????!!????????</font><BR><p>
???:<a href=http://www.ava222.com/ target="_blank">sex369?????</a> -
<BR>
?2?:<a href=http://www.ava666.com/ target="_blank">????????</a> - <BR>
?3?:<a href=http://www.avc222.com/ target="_blank">live173??live?</a>
- <BR>
?4?:<a href=http://www.avc666.com/ target="_blank">0401???</a> - <BR>
?5?:<a href=http://www.avyyy.com/ target="_blank">?????</a> - <BR>
?6?:<a href=http://www.avggg.com/ target="_blank">???????</a> - <BR>
?7?:<a href=http://www.avuuu.com/ target="_blank">??????</a> - <BR>
?8?:<a href=http://www.avrrr.com/ target="_blank">???????</a> - <BR>
?9?:<a href=http://www.avc888.com/ target="_blank">mm158????</a> -
<BR>
?10?:<a href=http://a4.j0401.com/ target="_blank">?????</a> - <BR><p>
<a href="http://www.a0925.com/" target=_blank><img src="http://www.
6cc.tw/01/12345.gif" align=center border=0 /></a>- <BR>
<a href="http://www.avyyy.com/"><img height=120 src="http://av0401.com/
55123002.gif" width="460" height="102"></a></td>


From lie.1296 at gmail.com  Fri May  8 03:16:59 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Fri, 08 May 2009 07:16:59 GMT
Subject: Simple programme - Just want to know whether this is correct
	way of  coding
In-Reply-To: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
Message-ID: <L%QMl.9538$y61.6494@news-server.bigpond.net.au>

guptha wrote:
> Hi group,
> This is my first programme in python ,I need to know whether my code
> is in the right path of performance
> 
> I wrote a code using multithreading to send mails

Can't you use BCC?

> The code Works fine ,but I doubt about the performance issue ,My
> intention is to send mails concurrently to large number of mail.
> 1.For every mail id i send It creates a new SMTP object,in case, if i
> send to 1000 or more ids
>       a) It obliviously creates that much SMPT connections ,is this a
> right approach .
> Thanks in Advance

In a lot of cases involving internet, the bottleneck would be internet 
speed. And for most purpose (except spamming) it is not really that 
necessary to send so much email in so little time (assuming you send 1 
mail per second -- which is really slow considering today's processor 
and internet speed -- you can send 86400 mails per day). Larger mailing 
list can also use BCC.


From __peter__ at web.de  Fri May  8 03:19:13 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 08 May 2009 09:19:13 +0200
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
Message-ID: <gu0mdh$v8v$02$1@news.t-online.com>

Mark Summerfield wrote:

> I had a quick search & didn't find anything _nice_ that produced
> attributes with really private data, so I came up with a possible
> solution---for Python 3.

Do really you think what you suggest below is "nice"?

By the way, your Attribute descriptor stores the value for all instances of 
A in the same variable...

Peter




From davea at ieee.org  Fri May  8 03:25:56 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 08 May 2009 03:25:56 -0400
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
Message-ID: <4A03DE84.40406@ieee.org>

Li Wang wrote:
> Hi all:
>
> I am trying to read a non-text file as a string by using Python
> read(), however, it seems there is some thing wrong with it. I can use
> read() on text file correctly, but unable to read .xls file correctly.
> (The program can read any file correctly in Fedora 10)
>
> Any idea how to solve this problem?
>
> Thank you very much!
>
>   
Chances are you forgot the "b" parameter to open().  Unnecessary in 
Unix, it tells the library to *not* translate \r\n  to \n upon read, or 
the inverse on write.  In other words, with the "b" parameter, the file 
is read in unchanged.

        infile = open(filename, "rb")
       ....




From rustompmody at gmail.com  Fri May  8 03:46:05 2009
From: rustompmody at gmail.com (Rustom Mody)
Date: Fri, 8 May 2009 13:16:05 +0530
Subject: xml in python
Message-ID: <f46c52560905080046t4b9611vb304df22703eb744@mail.gmail.com>

Can someone give me a heads up on xml parsing in python?
The context is that I want to write a simple docbook to text converter.
DOM is alright -- dont want to break my head with SAX just for performance
when my documents are not likely to be large.

My problem is that there seems to be so many nearly equivalent ways (Pyxml?
Amara?) some of which have moved from 3rd party to builtin status that I am
not clear what is the current method of choice.

Thanks
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From __peter__ at web.de  Fri May  8 03:54:30 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 08 May 2009 09:54:30 +0200
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
Message-ID: <gu0ofm$oj9$00$1@news.t-online.com>

Nick wrote:

>         self.cursor = self.connection.cursor()
>         first = True
>         for row in reader:
>             if first:
>                 headers = []
>                 for r in row:
>                     n = r.strip().replace (' ', '_').replace ('-','_')
>                     headers.append (n)
>                 command = 'create table csv (%s)' % ','.join (headers)
>                 self.cursor.execute (command)
>                 first = False
>             else:
>                 command = 'insert into csv values ("%s")' % '","'.join
> (row)
>                 self.cursor.execute (command)
> 

You can simplify that a bit:

cursor = self.cursor = self.connection.cursor()

first_row = next(reader)
headers = [column.strip().replace(" ", "_").replace("-", "_") for column in 
first_row]
cursor.execute("create table csv (%s)" % ", ".join(headers))

placeholders = ", ".join("?"*len(headers))
command = "insert into csv values (%s)" % placeholders
cursor.executemany(command, reader)

While it may not matter here using placeholders instead of manually escaping 
user-provided values is a good habit to get into.

>         self.cursor.execute (self.query)
>         rows = self.cursor.fetchall()
  
rows = self.cursor.execute(self.query)

doesn't build an intermediate list.

>         i = 0
>         for row in rows:
>             results.add (row, i)
>             i = i + 1
 
This is written

for i, row in enumerate(rows):
    results.add(row, i)

in idiomatic Python.

Peter



From davea at ieee.org  Fri May  8 04:02:21 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 08 May 2009 04:02:21 -0400
Subject: Simple programme - Just want to know whether this is correct
	way of 	coding
In-Reply-To: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
Message-ID: <4A03E70D.305@ieee.org>

guptha wrote:
> Hi group,
> This is my first programme in python ,I need to know whether my code
> is in the right path of performance
>
> I wrote a code using multithreading to send mails
>
> FROM = '....com'
>
> SUBJECT = 'This is the subject'
> MSGBODY = 'This the body of the message '
> MAILSERVER = 'mail....com'
> port = 25
> username = 'username'
> password = 'pass'
>
> # trim the strings of any leading or trailing spaces
> FROM = FROM.strip()
> SUBJECT = SUBJECT.strip()
> MSGBODY = MSGBODY.strip()
> MAILSERVER = MAILSERVER.strip()
> username = username.strip()
> password = password.strip()
>
>
> # set up email parameters
> msg = MIMEMultipart()
> msg['From'] = FROM
> msg['Subject'] = SUBJECT
>
> #--------------------------------------------------
> print "Starting Multi Thread Method"
>
> class MyThread(Thread):
>
>     def __init__(self, site,  FROM, MSGBODY):
>         Thread.__init__(self)
>         self.site = site
> 	self.FROM=FROM
> 	self.MSGBODY=MSGBODY
>
>     def run(self):
> 	#Connect to server
> 	print 'Connecting to mail server ', MAILSERVER
> 	try:
> 		s = smtplib.SMTP(MAILSERVER,port)
> 		print 'connected'
> 	#s.set_debuglevel(1)
> 	except:
> 		print 'ERROR: Unable to connect to mail server', sys.exc_info	()[0]
> 	 	sys.exit(1)
>
> 	#login to server
> 	if password <> '':
> 		print 'Logging into mail server'
> 		try:
> 			s.login(username,password)
> 		except:
> 			print 'ERROR: Unable to login to mail server', MAILSERVER
> 			print 'Please recheck your password'
> 			sys.exit(1)
> 	print "running for %s " %self.site
> 	print s
> 	s.sendmail(self.FROM, self.site, self.MSGBODY)
> 	print "from %s" %self.FROM
> 	print "msg %s" %self.MSGBODY
>  	print "Emailed for  site %s" %self.site
> 	s.quit()
> 	s.close()
>
>
> a= time.time()
> threads = []
>
> for site in listTo:
>     T = MyThread(site,FROM,MSGBODY)
>     threads.append(T)
>     T.start()
>
>
> for i in threads:
>     i.join()
>
> print "Took %s seconds" %str(time.time()-a)
>
> #-----------------------------------------------------
>
> The code Works fine ,but I doubt about the performance issue ,My
> intention is to send mails concurrently to large number of mail.
> 1.For every mail id i send It creates a new SMTP object,in case, if i
> send to 1000 or more ids
>       a) It obliviously creates that much SMPT connections ,is this a
> right approach .
> Thanks in Advance
>
>   
Any program that launches multiple threads is not a "simple program," 
especially for a first time user.

I don't know smtplib at all, so these questions may be off-base.  First, 
sendmail() takes as its second argument a list of to_addr, so why not 
send these all as a single operation?  If that would work, this would 
degenerate into a much simpler program.  More importantly, it should 
generate much less traffic between your machine and your smtp server, 
and probably less traffic between that server and the actual destination 
domains.  I have to assume that if it's a single sendmail request, the 
server would then batch-send them to each unique domain in the to_addrs 
list.    Anyway, what if the message body be a couple of megabytes, and 
you're sending it to 100 people?  Sending a single message with a list 
in to_list would save tons of time.

Second, if you do have to send them all separately (for example, if you 
had different mail_options, which you don't yet), then I question the 
need or workability of using a separate thread for all of them.  Trying 
to open  1000 threads is very resource hungry,  Trying to open that many 
smtp connections is even worse.  One of these is likely to fail.  And 
I'm guessing that beyond 10 or so, it'd run at least as fast with a 
different approach.


If I had to do something like this, I'd expect to wind up with some 
number (say 10) of threads, and a queue of things for them to do.  So if 
you had 1000 things, each thread would do approximately 100 of them.  
Now, sharing a queue like that is more work, with more things to mess 
up.  Currently your threads share only read-only data, which makes 
threads pretty straightforward.




From soumen08 at gmail.com  Fri May  8 04:12:30 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Fri, 8 May 2009 13:42:30 +0530
Subject: confused with subprocess.Popen
Message-ID: <f6a09c160905080112x2620169fk9249e9469be607ea@mail.gmail.com>

Hello,
for a certain app, i used to use a command:
os.system("soundwrapper espeak -f line.txt")
now, if i wanted to kill espeak, i would have to run:
os.system("killall espeak")
since the subprocess module allows sending SIGKILL to the process, i
decided to switch to using it. However i cant pass the spaced out
arguments to it. For example:
a=subprocess.Popen("soundwrapper espeak -f line.txt")
results in a OSError, no such file or directory.
How do i use the Popen function?
Regards
Soumen


From li.wang.d at gmail.com  Fri May  8 04:14:16 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 8 May 2009 18:14:16 +1000
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <50697b2c0905072238o6a00fc07ibc92423926313131@mail.gmail.com>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
	<50697b2c0905072238o6a00fc07ibc92423926313131@mail.gmail.com>
Message-ID: <11aabe3b0905080114ma4efb2dv7879e64104e0f7f4@mail.gmail.com>

2009/5/8 Chris Rebert <clp2 at rebertia.com>:
> On Thu, May 7, 2009 at 10:04 PM, Li Wang <li.wang.d at gmail.com> wrote:
>> Hi all:
>>

> the file, e.g. open("the_file.xls", "rb")
> Unlike *nix, Windows differentiates between binary and text files,
> hence the need for the "b" flag to specify which you're dealing with.

Hi
Thank you very much for reply,

The method doesn't work.
Here is the problem: after reading the whole fie as a string, I need
the string to be made of 8bits-symbols.

I do not mind what's the content in the file, what I need to do is
something like reading the file byte by byte and concatenate these
bytes into a single string.

Any suggestions?

Thank you very much





-- 
Li
------
Time is all we have
and you may find one day
you have less than you think


From dotancohen at gmail.com  Fri May  8 04:21:40 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Fri, 8 May 2009 11:21:40 +0300
Subject: What would YOU like to see in a txt to html converter?
In-Reply-To: <gtv9ik$qes$1@news-cedar.fernuni-hagen.de>
References: <gtv2e6$hoi$1@news-cedar.fernuni-hagen.de>
	<87my9okc1q.fsf@lakeside.sjtu.edu.cn>
	<gtv9ik$qes$1@news-cedar.fernuni-hagen.de>
Message-ID: <880dece00905080121o6d63b49ap9f51b5fa5fbf5264@mail.gmail.com>

> I already thought of using dots or asterisks
> or whatever to let the user format the text instead of using html tags (this
> would be quite paradox ;-)
>

Then please do not invent another wheel. Write a markdown parser:
http://en.wikipedia.org/wiki/Markdown

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il


From jeremiah.dodds at gmail.com  Fri May  8 04:31:07 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Fri, 8 May 2009 09:31:07 +0100
Subject: Web Based Front End?
In-Reply-To: <18804639-32ae-4bdf-9ecc-4c8b21f8a43f@g19g2000vbi.googlegroups.com>
References: <18804639-32ae-4bdf-9ecc-4c8b21f8a43f@g19g2000vbi.googlegroups.com>
Message-ID: <12cbbbfc0905080131g5c48d15oab489e06318150ac@mail.gmail.com>

On Fri, May 8, 2009 at 2:52 AM, <baseelinger at yahoo.com> wrote:

> So, my question is what is the best method to be able to have a user
> enter specific data on a web page, have that data be passed to the
> Python script and then have the output returned to the web page?
> Essentially, I want to use a web based front end to accomplish the
> same thing that the IDLE GUI does, (asks me a few questions, I answer
> them, it builds a configuration file and prints it to the screen).
>
>
There isn't a best way, really.

I'm partial to CherryPy. A minimal example would look like so:

-------------------------------
import cherrypy

class Root(object):
    page = "<html><head><title></title></head><body>%s</body></html>"
    @cherrypy.expose
    def enter_data(self, data):
        return self.page % ("You entered: " + data,)

    @cherrypy.expose
    def index(self):
        form = """
        <form id="aform" name="aform" action="enter_data" method="POST">
          <textarea name="data">Enter some stuff here</textarea>
          <input type="submit" value="Submit"/>
        </form>
        """
        return self.page % form

if __name__ == '__main__':
    cherrypy.quickstart(Root())

-----------------------------------

Note, I wouldn't actually recommend using string building like that for
returning pages unless your app is seriously trivial. I use Genshi for
templating, the tutorial that they have is very nice (and uses cherrypy).

There's a plethora of different ways to build web apps in python. In all
reality, you should probably try out a few and see what suits your tastes.
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From piet at cs.uu.nl  Fri May  8 04:49:39 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 08 May 2009 10:49:39 +0200
Subject: SimpleXMLRPCServer and creating a new object on for each new
	client request.
References: <mailman.5173.1241647285.11746.python-list@python.org>
	<m2ab5ojyff.fsf@cs.uu.nl>
Message-ID: <m24ovwj7x8.fsf@cs.uu.nl>

>>>>> Piet van Oostrum <piet at cs.uu.nl> (PvO) wrote:

>>>>> Jelle Smet <jelle at smetj.net> (JS) wrote:
>PvO> One more thing:

>JS> I start python interactively:
>>>>> import xmlrpclib
>>>>> session1=xmlrpclib.ServerProxy('http://localhost:8000')
>>>>> session2=xmlrpclib.ServerProxy('http://localhost:8000')
>>>>> print session1.show_random()
>JS> 13930
>>>>> print session2.show_random()
>JS> 13930
>>>>> 

>PvO> I get the impression, also from your use of the variable names
>PvO> 'session1' and 'session2' that xmlrpclib.ServerProxy() gives you some
>PvO> kind of connection to the XMLRPC server. 

This should have been: I get the impression, also from your use of the
variable names 'session1' and 'session2', *that you think* that
xmlrpclib.ServerProxy() gives you some kind of connection to the XMLRPC
server.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From pavlovevidence at gmail.com  Fri May  8 04:52:31 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 8 May 2009 01:52:31 -0700 (PDT)
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
Message-ID: <d3f28469-3eeb-4b59-be57-66053e03fd44@n7g2000prc.googlegroups.com>

On May 7, 11:37?pm, Mark Summerfield <l... at qtrac.plus.com> wrote:
> Hi,
>
> I had a quick search & didn't find anything _nice_ that produced
> attributes with really private data, so I came up with a possible
> solution---for Python 3.
> (For Python 2 there does seem to be an approach although I'm not
> keen on it:http://www.builderau.com.au/blogs/byteclub/viewblogpost.htm?p=339270875
> )
>
> Here's a standard class with one read-only and one writable
> property that has a tiny bit of validation.
>
> class P:
> ? ? def __init__(self, w):
> ? ? ? ? self.w = w
> ? ? @property
> ? ? def r(self): return 5
> ? ? @property
> ? ? def w(self): return self.__w
> ? ? @w.setter
> ? ? def w(self, value):
> ? ? ? ? if value > 0: # Only +ve values allowed
> ? ? ? ? ? ? self.__w = value
> ? ? ? ? else:
> ? ? ? ? ? ? raise ValueError("'{0}' is not valid for w".format(value))
>
> The read-only property is completely private because it isn't
> actually stored as such.
>
> But if we do dir() on an instance, in addition to 'r' and 'w', we
> also have '_P__w'. So the writable property's data is easily
> accessible, and the validation can be got around:
>
> >>> p = P(9)
> >>> p.r, p.w
> (5, 9)
> >>> p.w = 43
> >>> p.r, p.w
> (5, 43)
> >>> p.w = -7
>
> Traceback (most recent call last):
> ...
> ValueError: '-7' is not valid for w>>> p._P__w = -7
> >>> p.r, p.w
>
> (5, -7)
>
> Here's a class where I can't think of a way to access the private
> data and set invalid values.
>
> class A:
> ? ? r = Attribute("r", 5)
> ? ? w = Attribute("w", None, lambda self, value: value > 0)
> ? ? def __init__(self, w):
> ? ? ? ? self.w = w
>
> The Attribute class is a descriptor that takes three arguments:
> name of attribute, initial value (essential for read-only
> attributes!), and a validator function (which could be "lambda
> *a: True" if any value is accepatble).
>
> >>> a = A(9)
> >>> a.r, a.w
> (5, 9)
> >>> a.w = 43
> >>> a.r, a.w
> (5, 43)
> >>> a.w = -7
>
> Traceback (most recent call last):
> ...
> ValueError: '-7' is not valid for w
>
> If we do a dir(a) the only attributes we get (beyond those from
> object) are 'r' and 'w', so it shouldn't be possible to get
> around the validation---at least not easily.

Ok, I'll bite.

A.w = -7

A.__class__ = A_without_validation
a.w = -7

Attribute.__set__ = function_that_ignores_validation
a.w = -7


I am not opposed to adding a little well-considered protection to some
attributes where mistakes are prone to happen and/or dangerous, but it
is futile to try to stop access entirely.  There's just too many back
doors.

I would suggest that there really isn't much point in anything more
complex than your first solution, which was to validate with
properties and to store the value in a separate attribute.
Respectable programmers won't lightly bypass your validation if they
see that you've taken steps to enforce it.  OTOH, once a programmer,
respectable or not, decides to override your protection, they are not
likely to be stopped by something more complex.  So there is no point
in making it more complex.


Carl Banks


From li.wang.d at gmail.com  Fri May  8 05:04:34 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 8 May 2009 19:04:34 +1000
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <11aabe3b0905080114ma4efb2dv7879e64104e0f7f4@mail.gmail.com>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
	<50697b2c0905072238o6a00fc07ibc92423926313131@mail.gmail.com>
	<11aabe3b0905080114ma4efb2dv7879e64104e0f7f4@mail.gmail.com>
Message-ID: <11aabe3b0905080204w1aee64d1ma587cbeb45720876@mail.gmail.com>

Hi:

Problem solved

Thank you very much, it works, It is my own problem:)

All the best,
Li

2009/5/8 Li Wang <li.wang.d at gmail.com>:
> 2009/5/8 Chris Rebert <clp2 at rebertia.com>:
>> On Thu, May 7, 2009 at 10:04 PM, Li Wang <li.wang.d at gmail.com> wrote:
>>> Hi all:
>>>
>
>> the file, e.g. open("the_file.xls", "rb")
>> Unlike *nix, Windows differentiates between binary and text files,
>> hence the need for the "b" flag to specify which you're dealing with.
>
> Hi
> Thank you very much for reply,
>
> The method doesn't work.
> Here is the problem: after reading the whole fie as a string, I need
> the string to be made of 8bits-symbols.
>
> I do not mind what's the content in the file, what I need to do is
> something like reading the file byte by byte and concatenate these
> bytes into a single string.
>
> Any suggestions?
>
> Thank you very much
>
>
>
>
>
> --
> Li
> ------
> Time is all we have
> and you may find one day
> you have less than you think
>



-- 
Li
------
Time is all we have
and you may find one day
you have less than you think


From li.wang.d at gmail.com  Fri May  8 05:08:03 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 8 May 2009 19:08:03 +1000
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <4A03DE84.40406@ieee.org>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
	<4A03DE84.40406@ieee.org>
Message-ID: <11aabe3b0905080208x5df4df5bu4eec2712d842320@mail.gmail.com>

Hi  Dave:
Thank you very much for you explanation:)


> Chances are you forgot the "b" parameter to open().  Unnecessary in Unix, it
> tells the library to *not* translate \r\n  to \n upon read, or the inverse
> on write.  In other words, with the "b" parameter, the file is read in
> unchanged.

So, if I am using python in Linux, do open('file', 'r') and
open('file', 'rb') work the same way?

Thanks,

Best regards,
Li


From piet at cs.uu.nl  Fri May  8 05:12:21 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 08 May 2009 11:12:21 +0200
Subject: Simple programme - Just want to know whether this is correct way
	of coding
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
Message-ID: <m2ws8shsay.fsf@cs.uu.nl>

>>>>> guptha <gjango.py at gmail.com> (g) wrote:

>g> Hi group,
>g> This is my first programme in python ,I need to know whether my code
>g> is in the right path of performance

>g> I wrote a code using multithreading to send mails

>g> FROM = '....com'

>g> SUBJECT = 'This is the subject'
>g> MSGBODY = 'This the body of the message '
>g> MAILSERVER = 'mail....com'
>g> port = 25
>g> username = 'username'
>g> password = 'pass'

>g> # trim the strings of any leading or trailing spaces
>g> FROM = FROM.strip()
>g> SUBJECT = SUBJECT.strip()
>g> MSGBODY = MSGBODY.strip()
>g> MAILSERVER = MAILSERVER.strip()
>g> username = username.strip()
>g> password = password.strip()


>g> # set up email parameters
>g> msg = MIMEMultipart()
>g> msg['From'] = FROM
>g> msg['Subject'] = SUBJECT

>g> #--------------------------------------------------
>g> print "Starting Multi Thread Method"

>g> class MyThread(Thread):

>g>     def __init__(self, site,  FROM, MSGBODY):
>g>         Thread.__init__(self)
>g>         self.site = site
>g> 	self.FROM=FROM
>g> 	self.MSGBODY=MSGBODY

>g>     def run(self):
>g> 	#Connect to server
>g> 	print 'Connecting to mail server ', MAILSERVER
>g> 	try:
>g> 		s = smtplib.SMTP(MAILSERVER,port)
>g> 		print 'connected'
>g> 	#s.set_debuglevel(1)
>g> 	except:
>g> 		print 'ERROR: Unable to connect to mail server', sys.exc_info	()[0]
>g> 	 	sys.exit(1)

>g> 	#login to server
>g> 	if password <> '':
>g> 		print 'Logging into mail server'
>g> 		try:
>g> 			s.login(username,password)
>g> 		except:
>g> 			print 'ERROR: Unable to login to mail server', MAILSERVER
>g> 			print 'Please recheck your password'
>g> 			sys.exit(1)
>g> 	print "running for %s " %self.site
>g> 	print s
>g> 	s.sendmail(self.FROM, self.site, self.MSGBODY)
>g> 	print "from %s" %self.FROM
>g> 	print "msg %s" %self.MSGBODY
>g>  	print "Emailed for  site %s" %self.site
>g> 	s.quit()
>g> 	s.close()


>g> a= time.time()
>g> threads = []

>g> for site in listTo:
>g>     T = MyThread(site,FROM,MSGBODY)
>g>     threads.append(T)
>g>     T.start()


>g> for i in threads:
>g>     i.join()

>g> print "Took %s seconds" %str(time.time()-a)

>g> #-----------------------------------------------------

Tuesday this same program with some minor differences was posted by
gganesh <ganesh.gbg at gmail.com>. There was a discussion about that. So
did you copied that program with the suggested changes? I don't think it
is nice to have two parallel discussions on the same subject. And
copying without giving credits is not considered nice behaviour either.
Usually it is called plagiarism.

>g> The code Works fine ,but I doubt about the performance issue ,My
>g> intention is to send mails concurrently to large number of mail.
>g> 1.For every mail id i send It creates a new SMTP object,in case, if i
>g> send to 1000 or more ids
>g>       a) It obliviously creates that much SMPT connections ,is this a
>g> right approach .

For such a big number of mails this is not the right approach. First
your operating system may not like it to have such a large number of
threads active. Second, the mail server probably doesn't like it that
you make such a large number of connections simultaneously. If the mail
server doesn't protest, probably its systems administrator will.
Moreover there is probably no benefit in having 1000 connections open to
the same mail server because long before there will be another
bottleneck such as your network connection or the CPU load of either
your computer or the mail server, unless you are on a very scalable
infrastructure.

A better solution will be to use a Thread Pool with a limited number of
simultaneous threads (my guess is that 10-20 or so would be good
enough).

And as I said to my students yesterday: You shouldn't program
multithreaded applications unless you have studied this subject
thoroughly. Of course I don't know how this applies to you.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From OldGrantonian at googlemail.com  Fri May  8 05:14:55 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Fri, 8 May 2009 02:14:55 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com> 
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com> 
	<Xns9C047FE3D4338duncanbooth@127.0.0.1>
	<3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>
	<mailman.5241.1241726706.11746.python-list@python.org>
	<2be30c71-4eb3-4ad7-a138-31ee0698a297@e20g2000vbc.googlegroups.com>
	<Xns9C04DB348C134duncanbooth@127.0.0.1>
Message-ID: <bcba712c-a945-4f83-a451-b7f9a9eb8a6c@n4g2000vba.googlegroups.com>

On May 7, 9:33?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> OldGrantonian <OldGranton... at googlemail.com> wrote:
> > Where do I find the win32 extensions?
>
> http://www.google.com/search?q=python+win32
>
> Any of the first 4 hits should help.

Success :)

Many thanks to all responders in this thread :)


From OldGrantonian at googlemail.com  Fri May  8 05:15:18 2009
From: OldGrantonian at googlemail.com (OldGrantonian)
Date: Fri, 8 May 2009 02:15:18 -0700 (PDT)
Subject: Which python version do I use with "virtualenv"?
References: <a15a02cf-3267-4be4-ba23-f15457fdb20b@l5g2000vbc.googlegroups.com>
	<c725ff26-e568-4d45-ae6f-2d00e34ceb5a@l5g2000vbc.googlegroups.com> 
	<61fc8aa3-764c-465b-86aa-1b25631609e4@r34g2000vba.googlegroups.com> 
	<Xns9C047FE3D4338duncanbooth@127.0.0.1>
	<3f3497db-a8a3-4c79-92cc-2a65d99baf71@r34g2000vba.googlegroups.com>
	<mailman.5241.1241726706.11746.python-list@python.org>
	<2be30c71-4eb3-4ad7-a138-31ee0698a297@e20g2000vbc.googlegroups.com>
	<Xns9C04DB348C134duncanbooth@127.0.0.1>
Message-ID: <b947bb3c-76db-4cf3-9e44-03cd4715bb63@g19g2000vbi.googlegroups.com>

On May 7, 9:33?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> OldGrantonian <OldGranton... at googlemail.com> wrote:
> > Where do I find the win32 extensions?
>
> http://www.google.com/search?q=python+win32
>
> Any of the first 4 hits should help.

Success :)

Many thanks to all responders in this thread :)


From alan.cameron at iname.com  Fri May  8 05:16:55 2009
From: alan.cameron at iname.com (Alan Cameron)
Date: Fri, 8 May 2009 10:16:55 +0100
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2><fbGMl.6972$hd4.4032@newsfe24.ams2>	<mailman.5238.1241723354.11746.python-list@python.org><lrGMl.6973$hd4.2539@newsfe24.ams2>
	<mailman.5248.1241732704.11746.python-list@python.org>
Message-ID: <WLSMl.4$3C7.0@newsfe30.ams2>

"Terry Reedy" <tjreedy at udel.edu> wrote in message 
news:mailman.5248.1241732704.11746.python-list at python.org...
> Alan Cameron wrote:
>>
>>>>> why is the printed result of
>>>>>
>>>>>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>>>>>> print(basket)
>>>>> {'orange', 'banana', 'pear', 'apple'}
>>>>>
>>>>> in the sequence given?
>
>> It appears that I used a reserved term when I used 'sequence'.
>
> No and Sort-of.
>
> No: We often use it in the normal English sense of ordered items, as I and 
> I think others assume you did.  Your question is quite legitimate, and the 
> answer, as indicated, is how an implementation interacts with the sequence 
> of additions.
>
> Sort-of: The library manual section of Sequence Types lists the sequence 
> operations common to all or most built-in Python sequence classes.  But it 
> does not explicitly define sequence.  Ranges, which are iterables that 
> directly support only indexing and len(), are called sequences. Dicts, 
> which are iterables that support len() but are usually not indexed by 
> integers, are not.  So that suggests a minimal definition of sequence, but 
> all the other sequence classes support much more that is typically 
> assumed.
>
> Keywords are reserved terms in the language such as 'if' and 'None' that 
> are specially recognized by the parser and which affect compilation. 
> Identifiers of the form '__x...y__' are reserved names.  Non-terminal 
> terms in the grammar are reserved terms, in a sense, within the reference 
> manual, but 'expression_list', not 'sequence', is used for comma-separated 
> sequences of expressions in code.  The comma-separated sequence of items 
> in a function call is separately defined as an 'argument_list' because 
> 'keyword_item's like 'a=b' and '*' and '**' are not expressions and 
> because there are some order restrictions on argument items.
>
> Terry Jan Reedy
>

Thanks for the explanation.

In particular reference to the tutorial section
http://docs.python.org/3.0/tutorial/datastructures.html#nested-list-comprehensions

There is a word which is ambiguous, at least to me.

Perhaps you can explain the use of the word 'comprehensions'.

Comprehension I understand
Comprehensions I don't.

Is there a glossary of terms somewhere?

-- 
Alan Cameron 




From koranthala at gmail.com  Fri May  8 05:26:36 2009
From: koranthala at gmail.com (koranthala)
Date: Fri, 8 May 2009 02:26:36 -0700 (PDT)
Subject: Creating temperory files for a web application
Message-ID: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>

Hi,
   I am doing web development using Django. I need to create an image
(chart) and show it to the users - based on some data which user
selects.
   My question is - how do I create a temporary image for the user? I
thought of tempfile, but I think it will be deleted once the process
is done - which would happen by the time user starts seeing the image.
I can think of no other option other than to have another script which
will delete all images based on time of creation.
   Since python is extensively used for web development, I guess this
should be an usual scenario for many people here. How do you usually
handle this?


From bearophileHUGS at lycos.com  Fri May  8 05:44:20 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 8 May 2009 02:44:20 -0700 (PDT)
Subject: heapq.merge with key=
References: <gtvjgk$tm8$1@foggy.unx.sas.com>
Message-ID: <5de878bd-52c4-4b2d-895b-c72f71519b7b@o14g2000vbo.googlegroups.com>

Looking for this, Kevin D. Smith?
http://code.activestate.com/recipes/502295/

Bye,
bearophile


From deets at nospam.web.de  Fri May  8 05:49:41 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 08 May 2009 11:49:41 +0200
Subject: Creating temperory files for a web application
References: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>
Message-ID: <76ideeF1d1gbsU1@mid.uni-berlin.de>

koranthala wrote:

> Hi,
>    I am doing web development using Django. I need to create an image
> (chart) and show it to the users - based on some data which user
> selects.
>    My question is - how do I create a temporary image for the user? I
> thought of tempfile, but I think it will be deleted once the process
> is done - which would happen by the time user starts seeing the image.

What makes you think that? You are the one creating it, you are responsible
for deleting it.

> I can think of no other option other than to have another script which
> will delete all images based on time of creation.
>    Since python is extensively used for web development, I guess this
> should be an usual scenario for many people here. How do you usually
> handle this?

There are various solutions - tempfiles, files based on a criteria (e.g.
username and image-properties) so that they don't pollute the harddrive.

For both approaches cleaning up as you suggest might be needed.

Alternatively, if you use sessions, you can use memory-cached images.

Or you can use the database.

But the cleaning-up might get necessary here as well.

The cleanest solution would be if the image would be rendered on the fly,
based on GET-parameters (or REST-ful urls) so that you can render it into
memory as string, but then forget immediately about it.

Diez


From bvidinli at gmail.com  Fri May  8 06:38:25 2009
From: bvidinli at gmail.com (bvidinli)
Date: Fri, 8 May 2009 13:38:25 +0300
Subject: php to python code converter
Message-ID: <36e8a7020905080338p140a3945if3325c7a83368970@mail.gmail.com>

if anybody needs:
http://code.google.com/p/phppython/


From news.btinternet.com at erik.feegles.net  Fri May  8 06:58:49 2009
From: news.btinternet.com at erik.feegles.net (Basil Brush)
Date: Fri, 08 May 2009 11:58:49 +0100
Subject: Compiling snippets of python code
Message-ID: <RNOdnWjWTNq2jZnXnZ2dnUVZ8g6dnZ2d@bt.com>


I need some advice on compiling snippets of python source at runtime. So
perhaps some python experts can point the way.

I am rewriting an old Java app in python. It tries to find solutions to
computational problems based on the idea of genetic evolution. The Java
version just used an array of bytes for the genomes. These byte
sequences were bytecode which told a rudimentary VM (virtual machine)
which maths functions to call. It used another array as a small chunk of
virtual memory for doing the calculations.

Having seen the docs on python's compile module, I'm thinking of doing
it differently in the new python version. My aim is to have the genomes
made up of a sequence of python source snippets, with each snippet to be
randomly generated, compiled, and executed at runtime. The advantage of
this is that it gives me greater flexibility and I can change what
actions the genomes can do without having to add new functions to my VM.

But there's some crucial points. When the snippet is executed I would
need to pass in a list or array, and I need the list back again with any
changes that were made; this is the virtual memory and how I would get
the results back, and is also how the snippet would get data from a
previous snippet in a sequence. How would I do this? Also, there is a
database of input data. Rather than pass all that data to the snippet
I'd rather have functions in my module which the snippet could call to
get data. So what's the scope of an executing piece of code? Can it
access my modules and functions?

My linux system has python 2.5 and I noticed that the docs say the
compile module has been removed from python 3.0. So I'm concerned about
whether my app would work in 3.0 if I upgraded. Does anyone know if they
moved the compiler to another module or simply removed it entirely?


From ldo at geek-central.gen.new_zealand  Fri May  8 07:10:12 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 08 May 2009 23:10:12 +1200
Subject: IIR filter conversion routines for Python?
References: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>
Message-ID: <gu13uk$iek$3@lust.ihug.co.nz>

In message <af91e679-
e8cf-4db5-9c88-6436e520ce4e at z7g2000vbh.googlegroups.com>, wzab wrote:

> I'm looking for procedures converting the IIR filters into cascade and/
> or parallel forms.

Tried a DSP textbook?



From ldo at geek-central.gen.new_zealand  Fri May  8 07:11:52 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 08 May 2009 23:11:52 +1200
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
	<gu0ofm$oj9$00$1@news.t-online.com>
Message-ID: <gu141o$iek$4@lust.ihug.co.nz>

In message <gu0ofm$oj9$00$1 at news.t-online.com>, Peter Otten wrote:

> While it may not matter here using placeholders instead of manually
> escaping user-provided values is a good habit to get into.

Until you hit things it can't deal with.



From micpringle at gmail.com  Fri May  8 07:39:38 2009
From: micpringle at gmail.com (Mic Pringle)
Date: Fri, 8 May 2009 12:39:38 +0100
Subject: String.Template Source ...
Message-ID: <51e08b630905080439u5ea51117j2dcaafe9b11eeb05@mail.gmail.com>

Hi,

I'd like to have a 'dig around' in the source for String.Template, but
can't seem to find where it lives.

Could someone please let me know where about's in the source (perhaps
a path?) the template functions live ?

I'm working on a Mac, using Leopard and the bundled version of Python.

Thanks

-Mic


From koranthala at gmail.com  Fri May  8 08:22:44 2009
From: koranthala at gmail.com (koranthala)
Date: Fri, 8 May 2009 05:22:44 -0700 (PDT)
Subject: Creating temperory files for a web application
References: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>
	<76ideeF1d1gbsU1@mid.uni-berlin.de>
Message-ID: <354db318-25b3-4af1-8fb1-cd86a0695637@x31g2000prc.googlegroups.com>

On May 8, 2:49?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> koranthala wrote:
> > Hi,
> > ? ?I am doing web development using Django. I need to create an image
> > (chart) and show it to the users - based on some data which user
> > selects.
> > ? ?My question is - how do I create a temporary image for the user? I
> > thought of tempfile, but I think it will be deleted once the process
> > is done - which would happen by the time user starts seeing the image.
>
> What makes you think that? You are the one creating it, you are responsible
> for deleting it.
>
> > I can think of no other option other than to have another script which
> > will delete all images based on time of creation.
> > ? ?Since python is extensively used for web development, I guess this
> > should be an usual scenario for many people here. How do you usually
> > handle this?
>
> There are various solutions - tempfiles, files based on a criteria (e.g.
> username and image-properties) so that they don't pollute the harddrive.
>
> For both approaches cleaning up as you suggest might be needed.
>
> Alternatively, if you use sessions, you can use memory-cached images.
>
> Or you can use the database.
>
> But the cleaning-up might get necessary here as well.
>
> The cleanest solution would be if the image would be rendered on the fly,
> based on GET-parameters (or REST-ful urls) so that you can render it into
> memory as string, but then forget immediately about it.
>
> Diez

Thank you Diez.
I would like to go ahead with the cleanest solution indeed.
I am creating the image on the fly. But I could not understand what
you meant by render to memory as a string.
How do we send the image to the browser?

Were you mentioning about having the image as a string and then
passing to the browser based on data URL scheme <RFC 2397> ?
Or is it something else like XBM format or something? I am sorry - but
I am quite unsure of what you meant?

I am actually creating PDFs, CSVs and images on the fly. So, I need to
delete them all after that.
The images can be somewhat large - ~2MB. The RFC mentions that large
data cannot be sent that way.

Is it that I will have to delete the images using a separate script
later?



From __peter__ at web.de  Fri May  8 08:23:53 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 08 May 2009 14:23:53 +0200
Subject: String.Template Source ...
References: <mailman.5283.1241784737.11746.python-list@python.org>
Message-ID: <gu188n$kb8$03$1@news.t-online.com>

Mic Pringle wrote:

> I'd like to have a 'dig around' in the source for String.Template, but
> can't seem to find where it lives.

I assume that you mean string.Template.

> Could someone please let me know where about's in the source (perhaps
> a path?) the template functions live ?
> 
> I'm working on a Mac, using Leopard and the bundled version of Python.

Import the module and inspect its __file__ attribute:

>>> import string
>>> string.__file__
'/usr/lib/python2.6/string.pyc'

This means that the string module's path is /usr/lib/python2.6/string.py 
over here.



From micpringle at gmail.com  Fri May  8 08:33:33 2009
From: micpringle at gmail.com (Mic Pringle)
Date: Fri, 8 May 2009 13:33:33 +0100
Subject: String.Template Source ...
In-Reply-To: <gu188n$kb8$03$1@news.t-online.com>
References: <mailman.5283.1241784737.11746.python-list@python.org>
	<gu188n$kb8$03$1@news.t-online.com>
Message-ID: <51e08b630905080533j6624dc8cy9886bbe49dc9d46a@mail.gmail.com>

Brilliant, thanks Peter.

-Mic

2009/5/8 Peter Otten <__peter__ at web.de>:
> Mic Pringle wrote:
>
>> I'd like to have a 'dig around' in the source for String.Template, but
>> can't seem to find where it lives.
>
> I assume that you mean string.Template.
>
>> Could someone please let me know where about's in the source (perhaps
>> a path?) the template functions live ?
>>
>> I'm working on a Mac, using Leopard and the bundled version of Python.
>
> Import the module and inspect its __file__ attribute:
>
>>>> import string
>>>> string.__file__
> '/usr/lib/python2.6/string.pyc'
>
> This means that the string module's path is /usr/lib/python2.6/string.py
> over here.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From list at qtrac.plus.com  Fri May  8 08:34:40 2009
From: list at qtrac.plus.com (Mark Summerfield)
Date: Fri, 8 May 2009 05:34:40 -0700 (PDT)
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
	<gu0mdh$v8v$02$1@news.t-online.com>
Message-ID: <5a532192-3e70-48d4-99b8-c8c75c3ef7cb@t10g2000vbg.googlegroups.com>

On 8 May, 08:19, Peter Otten <__pete... at web.de> wrote:
> MarkSummerfieldwrote:
> > I had a quick search & didn't find anything _nice_ that produced
> > attributes with really private data, so I came up with a possible
> > solution---for Python 3.
>
> Do really you think what you suggest below is "nice"?

Well the code isn't ugly and doesn't mess with the call stack etc.

> By the way, your Attribute descriptor stores the value for all instances of
> A in the same variable...

It seems like it does, but it doesn't. The hidden_value is an instance
variable that is created every time an Attribute object is created.

>>> from Attribute import *
>>> class A:
	a = Attribute("a", 5, lambda *a: True)
	b = Attribute("b", 5, lambda *a: True)
>>> class B:
	a = Attribute("a", 5, lambda *a: True)
	b = Attribute("b", 5, lambda *a: True)
>>> a = A()
>>> b = B()
>>> a.a,a.b,b.a,b.b
(5, 5, 5, 5)
>>> a.a=1;a.b=2;b.a=3;b.b=4
>>> a.a,a.b,b.a,b.b
(1, 2, 3, 4)

--
Mark Summerfield, Qtrac Ltd, www.qtrac.eu
    C++, Python, Qt, PyQt - training and consultancy
        "Programming in Python 3" - ISBN 0137129297


From koranthala at gmail.com  Fri May  8 08:38:44 2009
From: koranthala at gmail.com (koranthala)
Date: Fri, 8 May 2009 05:38:44 -0700 (PDT)
Subject: Creating temperory files for a web application
References: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>
	<76ideeF1d1gbsU1@mid.uni-berlin.de>
	<354db318-25b3-4af1-8fb1-cd86a0695637@x31g2000prc.googlegroups.com>
Message-ID: <275bb932-644b-4f64-80e8-7061ec7b2dff@a5g2000pre.googlegroups.com>

On May 8, 5:22?pm, koranthala <koranth... at gmail.com> wrote:
> On May 8, 2:49?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
>
>
> > koranthala wrote:
> > > Hi,
> > > ? ?I am doing web development using Django. I need to create an image
> > > (chart) and show it to the users - based on some data which user
> > > selects.
> > > ? ?My question is - how do I create a temporary image for the user? I
> > > thought of tempfile, but I think it will be deleted once the process
> > > is done - which would happen by the time user starts seeing the image.
>
> > What makes you think that? You are the one creating it, you are responsible
> > for deleting it.
>
> > > I can think of no other option other than to have another script which
> > > will delete all images based on time of creation.
> > > ? ?Since python is extensively used for web development, I guess this
> > > should be an usual scenario for many people here. How do you usually
> > > handle this?
>
> > There are various solutions - tempfiles, files based on a criteria (e.g.
> > username and image-properties) so that they don't pollute the harddrive.
>
> > For both approaches cleaning up as you suggest might be needed.
>
> > Alternatively, if you use sessions, you can use memory-cached images.
>
> > Or you can use the database.
>
> > But the cleaning-up might get necessary here as well.
>
> > The cleanest solution would be if the image would be rendered on the fly,
> > based on GET-parameters (or REST-ful urls) so that you can render it into
> > memory as string, but then forget immediately about it.
>
> > Diez
>
> Thank you Diez.
> I would like to go ahead with the cleanest solution indeed.
> I am creating the image on the fly. But I could not understand what
> you meant by render to memory as a string.
> How do we send the image to the browser?
>
> Were you mentioning about having the image as a string and then
> passing to the browser based on data URL scheme <RFC 2397> ?
> Or is it something else like XBM format or something? I am sorry - but
> I am quite unsure of what you meant?
>
> I am actually creating PDFs, CSVs and images on the fly. So, I need to
> delete them all after that.
> The images can be somewhat large - ~2MB. The RFC mentions that large
> data cannot be sent that way.
>
> Is it that I will have to delete the images using a separate script
> later?

Hi Diez,
   I think I understood your point now.
   Is it ?
   (1) Have a separate URL for the image - update urls.py for that
   (2) Pass all the GET parameters to that URL again.
   (3) Recalculate the fields again in that URL
   (4) Create the image and send back as image/png based on the
received fields.
   Other than the fact that I will be hitting the DB twice - for the
fields in the original URL and for creating Image in the second URL, I
think this is the best option.
   Please let me know whether I have understood correctly.

   The same option can be done for CSV and PDF files too. Thank you
very much Diez.


From list at qtrac.plus.com  Fri May  8 08:44:19 2009
From: list at qtrac.plus.com (Mark Summerfield)
Date: Fri, 8 May 2009 05:44:19 -0700 (PDT)
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
	<d3f28469-3eeb-4b59-be57-66053e03fd44@n7g2000prc.googlegroups.com>
Message-ID: <450ca2c0-1982-4554-8e28-1490c6c06510@q2g2000vbr.googlegroups.com>

On 8 May, 09:52, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 7, 11:37?pm, MarkSummerfield<l... at qtrac.plus.com> wrote:
>
>
>
> > Hi,
>
> > I had a quick search & didn't find anything _nice_ that produced
> > attributes with really private data, so I came up with a possible
> > solution---for Python 3.
> > (For Python 2 there does seem to be an approach although I'm not
> > keen on it:http://www.builderau.com.au/blogs/byteclub/viewblogpost.htm?p=339270875
> > )
>
> > Here's a standard class with one read-only and one writable
> > property that has a tiny bit of validation.
>
> > class P:
> > ? ? def __init__(self, w):
> > ? ? ? ? self.w = w
> > ? ? @property
> > ? ? def r(self): return 5
> > ? ? @property
> > ? ? def w(self): return self.__w
> > ? ? @w.setter
> > ? ? def w(self, value):
> > ? ? ? ? if value > 0: # Only +ve values allowed
> > ? ? ? ? ? ? self.__w = value
> > ? ? ? ? else:
> > ? ? ? ? ? ? raise ValueError("'{0}' is not valid for w".format(value))
>
> > The read-only property is completely private because it isn't
> > actually stored as such.
>
> > But if we do dir() on an instance, in addition to 'r' and 'w', we
> > also have '_P__w'. So the writable property's data is easily
> > accessible, and the validation can be got around:
>
> > >>> p = P(9)
> > >>> p.r, p.w
> > (5, 9)
> > >>> p.w = 43
> > >>> p.r, p.w
> > (5, 43)
> > >>> p.w = -7
>
> > Traceback (most recent call last):
> > ...
> > ValueError: '-7' is not valid for w>>> p._P__w = -7
> > >>> p.r, p.w
>
> > (5, -7)
>
> > Here's a class where I can't think of a way to access the private
> > data and set invalid values.
>
> > class A:
> > ? ? r = Attribute("r", 5)
> > ? ? w = Attribute("w", None, lambda self, value: value > 0)
> > ? ? def __init__(self, w):
> > ? ? ? ? self.w = w
>
> > The Attribute class is a descriptor that takes three arguments:
> > name of attribute, initial value (essential for read-only
> > attributes!), and a validator function (which could be "lambda
> > *a: True" if any value is accepatble).
>
> > >>> a = A(9)
> > >>> a.r, a.w
> > (5, 9)
> > >>> a.w = 43
> > >>> a.r, a.w
> > (5, 43)
> > >>> a.w = -7
>
> > Traceback (most recent call last):
> > ...
> > ValueError: '-7' is not valid for w
>
> > If we do a dir(a) the only attributes we get (beyond those from
> > object) are 'r' and 'w', so it shouldn't be possible to get
> > around the validation---at least not easily.
>
> Ok, I'll bite.
>
> A.w = -7
>
> A.__class__ = A_without_validation
> a.w = -7
>
> Attribute.__set__ = function_that_ignores_validation
> a.w = -7

I don't see how that can work? Sure you could replace the __set__
method, or the Attribute.__setter method. But neither can actually
change the hidden_value because AFAIK that only exists within the
scope of a closure and so isn't accesssible. (Well, maybe if you
started using the inspect module you'd find it.)

> I am not opposed to adding a little well-considered protection to some
> attributes where mistakes are prone to happen and/or dangerous, but it
> is futile to try to stop access entirely. ?There's just too many back
> doors.

Sure, but I like the fact that there is no "shadow" attribute, so just
"w" not "w" _and_ "_A__w".

> I would suggest that there really isn't much point in anything more
> complex than your first solution, which was to validate with
> properties and to store the value in a separate attribute.
> Respectable programmers won't lightly bypass your validation if they
> see that you've taken steps to enforce it. ?OTOH, once a programmer,
> respectable or not, decides to override your protection, they are not
> likely to be stopped by something more complex. ?So there is no point
> in making it more complex.
>
> Carl Banks

I think that's a fair viewpoint, but I still like the idea of there
being no _A__w available for property w.

--
Mark Summerfield, Qtrac Ltd, www.qtrac.eu
    C++, Python, Qt, PyQt - training and consultancy
        "Programming in Python 3" - ISBN 0137129297


From andrew at acooke.org  Fri May  8 08:49:07 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 8 May 2009 08:49:07 -0400 (CLT)
Subject: SQL and CSV
In-Reply-To: <gu141o$iek$4@lust.ihug.co.nz>
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
	<gu0ofm$oj9$00$1@news.t-online.com> <gu141o$iek$4@lust.ihug.co.nz>
Message-ID: <0631a4e5e48a064640dadd6e05f783cd.squirrel@acooke.dyndns.org>

Lawrence D'Oliveiro wrote:
> In message <gu0ofm$oj9$00$1 at news.t-online.com>, Peter Otten wrote:
>
>> While it may not matter here using placeholders instead of manually
>> escaping user-provided values is a good habit to get into.
>
> Until you hit things it can't deal with.

The post you are replying to was talking about using the SQL library's "?"
syntax that automatically escapes values.  The usual reason this is
recommended (if I have understood correctly) is that the library code is
much more likely to foil injection attacks.  I have seen this mentioned
often and assume it is good advice.

Can you expand on your comment?  I assume you are thinking of how the
library might handle some strange class.  But aren't the number of types
limited by SQL?  In which case a "thing that can't be handled" could
presumably be managed by adding an appropriate __str__ or __float__ or
whatever?  And you would still use the library to give safety with other
values.

Maybe you could give an example of the kind of problem you're thinking of?

Thanks,
Andrew





From list at qtrac.plus.com  Fri May  8 08:51:24 2009
From: list at qtrac.plus.com (Mark Summerfield)
Date: Fri, 8 May 2009 05:51:24 -0700 (PDT)
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
	<gu0mdh$v8v$02$1@news.t-online.com>
Message-ID: <423ca62c-094d-42ca-9257-cf36b5d38e1d@p4g2000vba.googlegroups.com>

[snip]
> By the way, your Attribute descriptor stores the value for all instances of
> A in the same variable...
>
> Peter

You're right.


From chambon.pascal at wanadoo.fr  Fri May  8 08:51:48 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Fri, 08 May 2009 14:51:48 +0200
Subject: Which one is best Python or Java for developing GUI applications?
Message-ID: <4A042AE4.5030601@wanadoo.fr>




On Thu, May 7, 2009 at 1:42 PM, Pascal Chambon 
<chambon.pascal at wanadoo.fr <mailto:chambon.pascal at wanadoo.fr>> wrote:

    Hello

    When a lot of code using wxwidgets is in place, it's sure that
    moving to qt is a big task ; even though, thanks to qt's GUI
    designer, it's possible to quickly reproduce the structure of the
    wxwidget application with QT widgets.

    If you want to see the power of Qt, I highly advice you to browse
    the very nice "demos" included in both the Qt and PyQt packages -
    those are Gui applications that let you watch all kind of abilities
    very fastly.
    Also, something that wxwidgets will surely never be able to do :
    http://labs.trolltech.com/blogs/2008/12/02/widgets-enter-the-third-dimension-wolfenqt/

    The 2 products (and the Gui designer, docs and demos) can be
    downloaded from these pages :
    http://www.qtsoftware.com/products/
    http://www.riverbankcomputing.co.uk/software/pyqt/download

    And if you have some time for reading :
    http://www.qtsoftware.com/files/pdf/qt-4.4-whitepaper
    http://doc.trolltech.com/4.5/index.html

    Good time with all that,
    regards,
    Pascal



    Qijing Li a ?crit :
>     Thank you for sharing this information.
>
>     I started to use wxPython two years ago,  which fit my needy very
>     well because
>     the jobs I worked on didn't focus on GUI. But now , the project I
>     am working on
>     involves much drawing shapes and looking, most of wxPython works
>     for me,
>     but one thing, as you mentioned, transparency drove me nuts.
>
>      wxPython suppose transparent window, but not transparent
>     background that is right what I need. I did research a lot and was
>     trying to find a proper way to get it, it turns out that I found
>     two tricky way, one is to use wx.EVT_ERASE_BACKGROUND tricky, the
>     other is to copy the image of background under the window as the
>     background image. Although the problem is solved, I feel
>     uncomfortable  about this.
>     I hope wxPython supports  real transparency some day.
>
>     Recently, I have no plan to transmit to other frameworks, such as
>     PyQt.
>     I'm really interested in what is differences between them,  I'll
>     check it.
>     Is there demo of PyQt ? or could you give me some links if they
>     are in the bag.
>
>     Have a good day!
>     Miles
>
>
>
>
>
>
>
>     On Tue, May 5, 2009 at 11:42 AM, Pascal Chambon
>     <chambon.pascal at wanadoo.fr <mailto:chambon.pascal at wanadoo.fr>> wrote:
>
>
>         The fact that Python is a dynamic language offers, in my
>         opinion, a huge advantage to quickly setup a GUI, without
>         caring about the infinite details of the variable types and
>         function signatures.
>         Its good handling of "function as first-class objects" is also
>         precious when comes the time of setting callbacks (I can't
>         bear anymore the way Swing does it, with interfaces etc.)
>
>         But much depends on the framework used, too. I've used
>         wxPython for a multimedia project, and actually it lacked a
>         lot of necessary features (transparency, event loop tuning,
>         multithreading support...), but that was 1 year ago, maybe
>         things have changed.
>         Anyway, I'd advocate the use of PyQt, which really offers
>         tremendous possibilities - if your application isn't a simple
>         office application, its' really worth turning towards pyqt.
>
>         Regards,
>         Pascal
>
>
>
>         Leon a ?crit :
>>         I think there are two advantages over java for GUI application
>>
>>         First, python is more productive and has very rich third modules
>>         support,
>>         you can check the demo of wxPython.
>>
>>         Second, you can develop native-looking GUI
>>
>>         BTW: I'm developing GUI application using python and wxPython.
>>
>>
>>
>>         Second,
>>         On May 4, 11:41 pm, srinivasan srinivas <sri_anna... at yahoo.co.in> <mailto:sri_anna... at yahoo.co.in>
>>         wrote:
>>           
>>>         Could you tell me does Python have any advantages over Java for the development of GUI applications?
>>>
>>>         Thanks,
>>>         Srini
>>>
>>>               Now surf faster and smarter ! Check out the new Firefox 3 - Yahoo! Editionhttp://downloads.yahoo.com/in/firefox/?fr=om_email_firefox <http://downloads.yahoo.com/in/firefox/?fr=om_email_firefox>
>>>             
>>         --
>>         http://mail.python.org/mailman/listinfo/python-list
>>
>>
>>           
>
>


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From __peter__ at web.de  Fri May  8 08:56:53 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 08 May 2009 14:56:53 +0200
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
	<gu0mdh$v8v$02$1@news.t-online.com>
	<5a532192-3e70-48d4-99b8-c8c75c3ef7cb@t10g2000vbg.googlegroups.com>
Message-ID: <gu1a6k$9uj$01$1@news.t-online.com>

Mark Summerfield wrote:

> On 8 May, 08:19, Peter Otten <__pete... at web.de> wrote:
>> MarkSummerfieldwrote:
>> > I had a quick search & didn't find anything _nice_ that produced
>> > attributes with really private data, so I came up with a possible
>> > solution---for Python 3.
>>
>> Do really you think what you suggest below is "nice"?
> 
> Well the code isn't ugly and doesn't mess with the call stack etc.
> 
>> By the way, your Attribute descriptor stores the value for all instances
>> of A in the same variable...
> 
> It seems like it does, but it doesn't. The hidden_value is an instance
> variable that is created every time an Attribute object is created.
> 
>>>> from Attribute import *
>>>> class A:
> a = Attribute("a", 5, lambda *a: True)
> b = Attribute("b", 5, lambda *a: True)
>>>> class B:
> a = Attribute("a", 5, lambda *a: True)
> b = Attribute("b", 5, lambda *a: True)
>>>> a = A()
>>>> b = B()
>>>> a.a,a.b,b.a,b.b
> (5, 5, 5, 5)
>>>> a.a=1;a.b=2;b.a=3;b.b=4
>>>> a.a,a.b,b.a,b.b
> (1, 2, 3, 4)

But attribute values are shared between all instances of the same class:

>>> class A:
...     x = Attribute("x", 42, lambda *a: True)
...
>>> a = A()
>>> b = A()
>>> a.x, b.x
(42, 42)
>>> a.x = "yadda"
>>> a.x, b.x
('yadda', 'yadda')

Peter



From pruebauno at latinmail.com  Fri May  8 09:06:43 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Fri, 8 May 2009 06:06:43 -0700 (PDT)
Subject: Python 3.1 beta 1
References: <mailman.5198.1241663377.11746.python-list@python.org> 
	<b698a5bf-d43c-412a-a5ee-3753ca31122b@z5g2000vba.googlegroups.com> 
	<mailman.5251.1241735650.11746.python-list@python.org>
Message-ID: <8f1780d2-96c5-4292-b4eb-64449000d9b3@t11g2000vbc.googlegroups.com>

On May 7, 6:33?pm, Benjamin Peterson <benja... at python.org> wrote:
> ?<pruebauno <at> latinmail.com> writes:
>
> > Congratulations!
>
> Thanks!
>
>
>
> > Is it just me or was some nice summary output added to the make
> > process? I get a nice list of modules that didn't compile and the ones
> > where the library could not be found.
>
> Are you compiling on a different platform? The nice output has been around for a
> while, bu only on non-Windows platforms.

Not really, I was on AIX. It is probably just me then, probably
because for the first time I see it making it through the whole
process even with the Tkinter libraries missing.


From list at qtrac.plus.com  Fri May  8 09:17:28 2009
From: list at qtrac.plus.com (Mark Summerfield)
Date: Fri, 8 May 2009 06:17:28 -0700 (PDT)
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
	<gu0mdh$v8v$02$1@news.t-online.com>
	<5a532192-3e70-48d4-99b8-c8c75c3ef7cb@t10g2000vbg.googlegroups.com>
	<gu1a6k$9uj$01$1@news.t-online.com>
Message-ID: <0096da6a-38a4-405a-894e-046ec69f1d50@b1g2000vbc.googlegroups.com>

On 8 May, 13:56, Peter Otten <__pete... at web.de> wrote:
> MarkSummerfieldwrote:
> > On 8 May, 08:19, Peter Otten <__pete... at web.de> wrote:
> >> MarkSummerfieldwrote:
> >> > I had a quick search & didn't find anything _nice_ that produced
> >> > attributes with really private data, so I came up with a possible
> >> > solution---for Python 3.
>
> >> Do really you think what you suggest below is "nice"?
>
> > Well the code isn't ugly and doesn't mess with the call stack etc.
>
> >> By the way, your Attribute descriptor stores the value for all instances
> >> of A in the same variable...
>
> > It seems like it does, but it doesn't. The hidden_value is an instance
> > variable that is created every time an Attribute object is created.
>
> >>>> from Attribute import *
> >>>> class A:
> > a = Attribute("a", 5, lambda *a: True)
> > b = Attribute("b", 5, lambda *a: True)
> >>>> class B:
> > a = Attribute("a", 5, lambda *a: True)
> > b = Attribute("b", 5, lambda *a: True)
> >>>> a = A()
> >>>> b = B()
> >>>> a.a,a.b,b.a,b.b
> > (5, 5, 5, 5)
> >>>> a.a=1;a.b=2;b.a=3;b.b=4
> >>>> a.a,a.b,b.a,b.b
> > (1, 2, 3, 4)
>
> But attribute values are shared between all instances of the same class:
>
> >>> class A:
>
> ... ? ? x = Attribute("x", 42, lambda *a: True)
> ...>>> a = A()
> >>> b = A()
> >>> a.x, b.x
> (42, 42)
> >>> a.x = "yadda"
> >>> a.x, b.x
>
> ('yadda', 'yadda')
>
> Peter

Yes. I did think of trying to create the closures dynamically the
first time the getter or setter was called---but that _is_ getting
ugly, so I'll give it up:-)

Thanks!

--
Mark Summerfield, Qtrac Ltd, www.qtrac.eu
    C++, Python, Qt, PyQt - training and consultancy
        "Programming in Python 3" - ISBN 0137129297


From pruebauno at latinmail.com  Fri May  8 09:20:37 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Fri, 8 May 2009 06:20:37 -0700 (PDT)
Subject: Python 2.6, File read() problems in Windows Xp
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com> 
	<4A03DE84.40406@ieee.org>
	<mailman.5278.1241773688.11746.python-list@python.org>
Message-ID: <cc2e86ca-29b2-464b-8f89-1a823098a2c1@h23g2000vbc.googlegroups.com>

On May 8, 5:08?am, Li Wang <li.wan... at gmail.com> wrote:
> Hi ?Dave:
> Thank you very much for you explanation:)
>
> > Chances are you forgot the "b" parameter to open(). ?Unnecessary in Unix, it
> > tells the library to *not* translate \r\n ?to \n upon read, or the inverse
> > on write. ?In other words, with the "b" parameter, the file is read in
> > unchanged.
>
> So, if I am using python in Linux, do open('file', 'r') and
> open('file', 'rb') work the same way?
>
> Thanks,
>
> Best regards,
> Li

In old Python up to 2.6, YES.


From p.f.moore at gmail.com  Fri May  8 09:21:30 2009
From: p.f.moore at gmail.com (Paul Moore)
Date: Fri, 8 May 2009 06:21:30 -0700 (PDT)
Subject: Tutorial or example use for python-graph library
Message-ID: <030fcef4-2bf5-4194-97f2-78ce95ca4ef5@v17g2000vbb.googlegroups.com>

I have just discovered the python-graph library. I've been interested
in graph algorithms for a long time, so I'd like to give this a try.
But there seems to be very little in the way of examples, or tutorial
documentation available. There's the API documentation, but that's not
really narrative form. And there are some examples in the
distribution, but these seem to be essentially artificial examples,
rather than real-world code (and they don't have much in the way of
documentation!)

Are there any reasonably-sized tutorials, or examples of common real-
world code, using this package? My google-fu wasn't strong enough to
find anything directly :-(

Thanks,
Paul


From Scott.Daniels at Acm.Org  Fri May  8 09:32:56 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 06:32:56 -0700
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <mailman.5278.1241773688.11746.python-list@python.org>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>	<4A03DE84.40406@ieee.org>
	<mailman.5278.1241773688.11746.python-list@python.org>
Message-ID: <8YudnbqqeKjLrpnXnZ2dnUVZ_hidnZ2d@pdx.net>

Li Wang wrote:
> So, if I am using python in Linux, do open('file', 'r') and
> open('file', 'rb') work the same way?

You get identical results, but you ar lying to the reader of your code.
you should include the 'b' if what you want is bytes (or octets if you
prefer), and not use it if what you expect is "text."   Your code
becomes less confusing by using 'b' properly, even if you see no
particular difference.

--Scott David Daniels
Scott.Daniels at Acm.Org


From li.wang.d at gmail.com  Fri May  8 09:47:23 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 8 May 2009 23:47:23 +1000
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <8YudnbqqeKjLrpnXnZ2dnUVZ_hidnZ2d@pdx.net>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
	<4A03DE84.40406@ieee.org>
	<mailman.5278.1241773688.11746.python-list@python.org>
	<8YudnbqqeKjLrpnXnZ2dnUVZ_hidnZ2d@pdx.net>
Message-ID: <11aabe3b0905080647h12c5553bt7f96515ecec79ddf@mail.gmail.com>

2009/5/8 Scott David Daniels <Scott.Daniels at acm.org>:
> Li Wang wrote:
>>
>> So, if I am using python in Linux, do open('file', 'r') and
>> open('file', 'rb') work the same way?
>
> You get identical results, but you ar lying to the reader of your code.
> you should include the 'b' if what you want is bytes (or octets if you
> prefer), and not use it if what you expect is "text."   Your code
> becomes less confusing by using 'b' properly, even if you see no
> particular difference.
>
Thanks a lot, very helpful:D
>



-- 
Li
------
Time is all we have
and you may find one day
you have less than you think


From li.wang.d at gmail.com  Fri May  8 09:47:51 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Fri, 8 May 2009 23:47:51 +1000
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <cc2e86ca-29b2-464b-8f89-1a823098a2c1@h23g2000vbc.googlegroups.com>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
	<4A03DE84.40406@ieee.org>
	<mailman.5278.1241773688.11746.python-list@python.org>
	<cc2e86ca-29b2-464b-8f89-1a823098a2c1@h23g2000vbc.googlegroups.com>
Message-ID: <11aabe3b0905080647s64bcea1ao521f312f9609c502@mail.gmail.com>

2009/5/8  <pruebauno at latinmail.com>:
> On May 8, 5:08 am, Li Wang <li.wan... at gmail.com> wrote:
>> Hi  Dave:
>> Thank you very much for you explanation:)
>>
>> > Chances are you forgot the "b" parameter to open().  Unnecessary in Unix, it
>> > tells the library to *not* translate \r\n  to \n upon read, or the inverse
>> > on write.  In other words, with the "b" parameter, the file is read in
>> > unchanged.
>>
>> So, if I am using python in Linux, do open('file', 'r') and
>> open('file', 'rb') work the same way?
>>
>> Thanks,
>>
>> Best regards,
>> Li
>
> In old Python up to 2.6, YES.
Thank you:D



-- 
Li
------
Time is all we have
and you may find one day
you have less than you think


From emreguney at gmail.com  Fri May  8 10:19:45 2009
From: emreguney at gmail.com (e.g. emre)
Date: Fri, 8 May 2009 07:19:45 -0700 (PDT)
Subject: Tutorial or example use for python-graph library
References: <030fcef4-2bf5-4194-97f2-78ce95ca4ef5@v17g2000vbb.googlegroups.com>
Message-ID: <8f032f4b-ae7a-45a0-baeb-82005229be22@n4g2000vba.googlegroups.com>

On May 8, 3:21?pm, Paul  Moore <p.f.mo... at gmail.com> wrote:
> I have just discovered the python-graph library. I've been interested
> in graph algorithms for a long time, so I'd like to give this a try.
> But there seems to be very little in the way of examples, or tutorial
> documentation available. There's the API documentation, but that's not
> really narrative form. And there are some examples in the
> distribution, but these seem to be essentially artificial examples,
> rather than real-world code (and they don't have much in the way of
> documentation!)
>
> Are there any reasonably-sized tutorials, or examples of common real-
> world code, using this package? My google-fu wasn't strong enough to
> find anything directly :-(
>
> Thanks,
> Paul

Hi,
you might want to check networkx as well, it is considerably well
documented:
http://networkx.lanl.gov/
Emre


From james at agentultra.com  Fri May  8 10:21:12 2009
From: james at agentultra.com (J Kenneth King)
Date: Fri, 08 May 2009 10:21:12 -0400
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5109.1241543371.11746.python-list@python.org>
	<85d4am8hq4.fsf@agentultra.com>
	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
	<8563gcx1p1.fsf@agentultra.com>
	<mailman.5242.1241727015.11746.python-list@python.org>
Message-ID: <854ovv7k13.fsf@agentultra.com>

Terry Reedy <tjreedy at udel.edu> writes:

> J Kenneth King wrote:
>>
>> Keep in mind that nested comprehensions are still available because
>> they do have a use case that justifies their existence.
>
> Nested comprehensions are available because because the syntax makes
> them available by default and making a fiddly exception would be
> contrary to Python's style.  A list comp creates an iterable. A list
> comp requires use of an iterable.  Therefore, a list comp may use a
> list comp.
>
>> However, I
>> think the Python documentation warns against their use because people
>> might rely on them for problems where they aren't necessary and since
>> they are difficult to read... it can lead to difficult to read code.
>
> Whenever the expression that results in the iterable used by a list
> comp is sufficiently complex, readability is improved by pulling it
> out as a separate statement. Nested list comps are often examplex of
> such sufficiently complex expressions, but not the only possible one.
>
> tjr

Agreed. A very succinct explanation of the point I was trying to make.


From nickle at gmail.com  Fri May  8 10:22:02 2009
From: nickle at gmail.com (Nick)
Date: Fri, 8 May 2009 07:22:02 -0700 (PDT)
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
	<gu0ofm$oj9$00$1@news.t-online.com> <gu141o$iek$4@lust.ihug.co.nz> 
	<mailman.5285.1241786958.11746.python-list@python.org>
Message-ID: <b7c68e74-21ae-4133-a058-e3c669f0faf6@o20g2000vbh.googlegroups.com>

On May 8, 1:49?pm, "andrew cooke" <and... at acooke.org> wrote:
> Lawrence D'Oliveiro wrote:
> > In message <gu0ofm$oj9$0... at news.t-online.com>, Peter Otten wrote:
>
> >> While it may not matter here using placeholders instead of manually
> >> escaping user-provided values is a good habit to get into.
>
> > Until you hit things it can't deal with.
>
> The post you are replying to was talking about using the SQL library's "?"
> syntax that automatically escapes values. ?The usual reason this is
> recommended (if I have understood correctly) is that the library code is
> much more likely to foil injection attacks. ?I have seen this mentioned
> often and assume it is good advice.
>
> Can you expand on your comment? ?I assume you are thinking of how the
> library might handle some strange class. ?But aren't the number of types
> limited by SQL? ?In which case a "thing that can't be handled" could
> presumably be managed by adding an appropriate __str__ or __float__ or
> whatever? ?And you would still use the library to give safety with other
> values.
>
> Maybe you could give an example of the kind of problem you're thinking of?
>
> Thanks,
> Andrew

Injection attacks aren't an issue, its a local app.

It's part of a reconciliation system, where sometimes data is in csv
files. If you want the whole csv file, you can use csv module without
a problem.

In some cases, I need to manipulate the data.

The choices are hard code the manipulation, or load the data from a
config file.

So what I've got is the query in the config and I can process it.

Nick


From Scott.Daniels at Acm.Org  Fri May  8 10:31:12 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 07:31:12 -0700
Subject: Compiling snippets of python code
In-Reply-To: <RNOdnWjWTNq2jZnXnZ2dnUVZ8g6dnZ2d@bt.com>
References: <RNOdnWjWTNq2jZnXnZ2dnUVZ8g6dnZ2d@bt.com>
Message-ID: <3pmdnQdqr4ic3JnXnZ2dnUVZ_jWdnZ2d@pdx.net>

Basil Brush wrote:
> I need some advice on compiling snippets of python source at runtime. So
> perhaps some python experts can point the way.
> 
> I am rewriting an old Java app in python. It tries to find solutions to
> computational problems based on the idea of genetic evolution. The Java
> version just used an array of bytes for the genomes. These byte
> sequences were bytecode which told a rudimentary VM (virtual machine)
> which maths functions to call. It used another array as a small chunk of
> virtual memory for doing the calculations.

Unlike Java and C++, functions and methods are first class.  You can
make lists and dictionaries containing functions, and that would be
the normal Python way of handling this, rather than generating source
from snippets.  You should take a look at Numpy if the "maths functions"
are operating on large chunks of data (fft, matrix operations, and the
like).  If the operations are smallish things, pure Python is likely the
way to go.  I don't understand what the "other array as a small chunk of
virtual memory" might be; my first take is YAGNI.

> Having seen the docs on python's compile module, I'm thinking of doing
> it differently in the new python version. My aim is to have the genomes
> made up of a sequence of python source snippets, with each snippet to be
> randomly generated, compiled, and executed at runtime. The advantage of
> this is that it gives me greater flexibility and I can change what
> actions the genomes can do without having to add new functions to my VM.
> 
> But there's some crucial points. When the snippet is executed I would
> need to pass in a list or array, and I need the list back again with any
> changes that were made; this is the virtual memory and how I would get
> the results back, and is also how the snippet would get data from a
> previous snippet in a sequence. 


Here is a toy-like version of what you might want to do:
     # Some operations:
     def double(vec):
         return [x * 2 for x in vec]

     def alternate(vec):
         '''An "unshuffling" step'''
         return vec[::2] + vec[1::2]

     def halve(vec):
         return [x / 2 for x in vec]

     # Some execution lists:
     processing = [double, alternate, halve, alternate]
     new_processing = alternate(processing) # you can shuffle any list

     assert new_processing == [double, halve, alternate, alternate]

     def perform(processes, data):
         for step in processes:
             data = step(data)
         return data

     start = [x * x for x in range(10)]
     assert perform(processing, start) == perform(new_processing, start)
     print start
     mid = perform(processing, start)
     print mid
     print perform(processing, mid)
     print perform(processing * 2, start)

prints:
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
[0, 16, 64, 9, 49, 4, 36, 1, 25, 81]
[0, 49, 25, 9, 1, 64, 36, 16, 4, 81]
[0, 49, 25, 9, 1, 64, 36, 16, 4, 81]


How would I do this? Also, there is a
> database of input data. Rather than pass all that data to the snippet
> I'd rather have functions in my module which the snippet could call to
> get data. So what's the scope of an executing piece of code? Can it
> access my modules and functions?
First, let go of managing the data allocation.  Second, realize passing
a list or array is simple and cheap, and _not_ proportional to the size
of the list or array.  You are passing the actual object.  You really
need to run through the tutorial; these questions will be answered there.
Sit down with the tutorial and the interpretter, executing anything you
don't quite understand.  I did it in IDLE, but you may prefer straight
command line.

> My linux system has python 2.5 and I noticed that the docs say the
> compile module has been removed from python 3.0. So I'm concerned about
> whether my app would work in 3.0 if I upgraded. Does anyone know if they
> moved the compiler to another module or simply removed it entirely?
Although I don't think you should be working with the compiler, if
you want to use something like that, you'd be better advised to use
the "ast" module first added in 2.6.  But for now, don't borrow trouble
you don't need. Rethink your problem and write it in Python.  Don't try
to do a line-by-line translation, you'll just have a slow awkward Python
program with a Java heart.

--Scott David Daniels
Scott.Daniels at Acm.Org


From apt.shansen at gmail.com  Fri May  8 10:36:52 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 8 May 2009 07:36:52 -0700
Subject: Creating temperory files for a web application
In-Reply-To: <354db318-25b3-4af1-8fb1-cd86a0695637@x31g2000prc.googlegroups.com>
References: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>
	<76ideeF1d1gbsU1@mid.uni-berlin.de>
	<354db318-25b3-4af1-8fb1-cd86a0695637@x31g2000prc.googlegroups.com>
Message-ID: <7a9c25c20905080736t5124faedue1a2dde40a41e28f@mail.gmail.com>

>
>
> Thank you Diez.
> I would like to go ahead with the cleanest solution indeed.
> I am creating the image on the fly. But I could not understand what
> you meant by render to memory as a string.
> How do we send the image to the browser?
>
> Were you mentioning about having the image as a string and then
> passing to the browser based on data URL scheme <RFC 2397> ?
> Or is it something else like XBM format or something? I am sorry - but
> I am quite unsure of what you meant?
>
> I am actually creating PDFs, CSVs and images on the fly. So, I need to
> delete them all after that.
> The images can be somewhat large - ~2MB. The RFC mentions that large
> data cannot be sent that way.
>

The question is, how are you generating these images? What you consider a
"file" and what a web server considers a "file" is really meaningless
actually. To a web browser, all a "file" is is a stream of content with a
certain content-type which it uses to determine how to treat it. This isn't
about the RFC2397. The web browser has no idea if the content its fetching
is from a file or a database or generated on the fly-- its all the same
thing. There's a URL which returns data, when requested. That data might be
a HTML file (as determined by its Content-type), in which case the browser
renders it. Or it might be a JPG, in which case it displays it. Or it might
be a zip file in which case it probably asks you where you want to save it.

Depending on how exactly you're actually "generating" the image, its quite
possible you don't need to use a real file at all. You can use a file-like
object, such as (c)StringIO and pass it to your image generation routines
which will generate the entire image in memory. You can write to this
file-like object as if it were a real file on the disk somewhere, seek,
scan, pass it to most libraries that need file objects.... and then when
done, you can return its contents... all without a -real- file on disk ever
being touched.

Like so vaguely:
    f = cStringIO.StringIO()
    my_library_which_makes_images(f)
    f.seek(0)
    return f.read()

Exactly how you indicate what the Content-type will be and do that will
depend on what web framework you're using.

For example, on one app I have -- I'm using TurboGears -- I do something
like this:

    @expose(format="image/jpeg", content_type="image/jpeg")
    def getJPEG(self, element_number):
        element = self._resourceManager.getElement(element_number)
        if element:
            return element.data

        return ''

Now the specifics of what's going on aren't important. But I'm connecting to
a remote system, and getting an object which contains the entire contents of
a JPEG in a single string. So the entire file is in memory. I could then
tweak or manipulate it with PIL to change that file all without any
filesystem access, working entirely on file-like objects in memory, then
return the contents.

--S
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From Shawn at Milochik.com  Fri May  8 10:43:08 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Fri, 8 May 2009 10:43:08 -0400
Subject: OT (humor): 'import antigravity' in action!
Message-ID: <2dc0c81b0905080743o334a04efg9e029f346b5b0795@mail.gmail.com>

I know you've probably all seen this 50 times, but just in case:
http://xkcd.com/353/

And here's the result:
http://icanhascheezburger.com/2009/05/06/funny-pictures-behavior-20/


From list at qtrac.plus.com  Fri May  8 10:48:59 2009
From: list at qtrac.plus.com (Mark Summerfield)
Date: Fri, 8 May 2009 07:48:59 -0700 (PDT)
Subject: Public attributes with really private data
References: <7b93110c-6000-4e71-8da9-ce6ea25c8a12@p4g2000vba.googlegroups.com>
	<gu0mdh$v8v$02$1@news.t-online.com>
	<5a532192-3e70-48d4-99b8-c8c75c3ef7cb@t10g2000vbg.googlegroups.com>
	<gu1a6k$9uj$01$1@news.t-online.com>
Message-ID: <ff697108-a739-411d-9c2a-d33ae680dd16@o27g2000vbd.googlegroups.com>

On 8 May, 13:56, Peter Otten <__pete... at web.de> wrote:
> Mark Summerfield wrote:
> > On 8 May, 08:19, Peter Otten <__pete... at web.de> wrote:
> >> MarkSummerfieldwrote:
> >> > I had a quick search & didn't find anything _nice_ that produced
> >> > attributes with really private data, so I came up with a possible
> >> > solution---for Python 3.
>
> >> Do really you think what you suggest below is "nice"?
>
> > Well the code isn't ugly and doesn't mess with the call stack etc.
>
> >> By the way, your Attribute descriptor stores the value for all instances
> >> of A in the same variable...
>
> > It seems like it does, but it doesn't. The hidden_value is an instance
> > variable that is created every time an Attribute object is created.
>
> >>>> from Attribute import *
> >>>> class A:
> > a = Attribute("a", 5, lambda *a: True)
> > b = Attribute("b", 5, lambda *a: True)
> >>>> class B:
> > a = Attribute("a", 5, lambda *a: True)
> > b = Attribute("b", 5, lambda *a: True)
> >>>> a = A()
> >>>> b = B()
> >>>> a.a,a.b,b.a,b.b
> > (5, 5, 5, 5)
> >>>> a.a=1;a.b=2;b.a=3;b.b=4
> >>>> a.a,a.b,b.a,b.b
> > (1, 2, 3, 4)
>
> But attribute values are shared between all instances of the same class:
>
> >>> class A:
>
> ... ? ? x = Attribute("x", 42, lambda *a: True)
> ...>>> a = A()
> >>> b = A()
> >>> a.x, b.x
> (42, 42)
> >>> a.x = "yadda"
> >>> a.x, b.x
>
> ('yadda', 'yadda')
>
> Peter

OK, I couldn't quite give it up. But the solution isn't nice or good.
It does work, but at the cost of an extra dictionary lookup on every
get or set, plus a dictionary to hold all the getters & setters. I
_don't recommend it_, but here it is anyway. I've done with it now:-)

class Attribute:

    __accessors = {}

    def __init__(self, name, first_value=None, validator=None):
        self.name = name
        self.first_value = first_value
        self.validator = validator

    def __get__(self, instance, owner=None):
        if instance is None:
            return self
        if (id(instance), self.name) not in self.__accessors:
            self.__makeAccessors(instance)
        return self.__accessors[id(instance), self.name][0](instance)


    def __set__(self, instance, value):
        if (id(instance), self.name) not in self.__accessors:
            self.__makeAccessors(instance)
        setter = self.__accessors[id(instance), self.name][1]
        if setter is None:
            raise AttributeError("'{0}' is read-only".format(
                                 self.__name__))
        return setter(instance, value)


    def __makeAccessors(self, instance):
        hidden_value = self.first_value
        getter = lambda self: hidden_value
        if self.validator is not None:
            def set(instance, value):
                if self.validator(instance, value):
                    nonlocal hidden_value
                    hidden_value = value
                else:
                    raise ValueError("'{0}' is not valid for {1}"
                                     .format(value, name))
            setter = set
        else:
            setter = None
        self.__accessors[id(instance), self.name] = (getter, setter)

--
Mark Summerfield, Qtrac Ltd, www.qtrac.eu
    C++, Python, Qt, PyQt - training and consultancy
        "Programming in Python 3" - ISBN 0137129297


From Kevin.Smith at sas.com  Fri May  8 10:49:23 2009
From: Kevin.Smith at sas.com (Kevin D. Smith)
Date: Fri, 8 May 2009 09:49:23 -0500
Subject: heapq.merge with key=
References: <gtvjgk$tm8$1@foggy.unx.sas.com>
	<mailman.5264.1241758129.11746.python-list@python.org>
Message-ID: <gu1gpj$nue$1@foggy.unx.sas.com>

On 2009-05-07 23:48:43 -0500, Chris Rebert <clp2 at rebertia.com> said:

> On Thu, May 7, 2009 at 2:23 PM, Kevin D. Smith <Kevin.Smith at sas.com> wrote:
>> I need the behavior of heapq.merge to merge a bunch of results from a
>> database. ?I was doing this with sorted(itertools.chain(...), key=
> ...), but
>> I would prefer to do this with generators. ?My issue is that I need
> the key
>> argument to sort on the correct field in the database. ?heapq.merge
> doesn't
>> have this argument and I don't understand the code enough to know if it's
>> possible to add it. ?Is this enhancement possible without drasticall
> y
>> changing the current code?
> 
> I think so. Completely untested code:
> 
> def key(ob):
>     #code here
> 
> class Keyed(object):
>     def __init__(self, obj):
>         self.obj = obj
>     def __cmp__(self, other):
>         return cmp(key(self.obj), key(other.obj))
> 
> def keyify(gen):
>     for item in gen:
>         yield Keyed(item)
> 
> def stripify(gen):
>     for keyed in gen:
>         yield keyed.obj
> 
> merged = stripify(merge(keyify(A), keyify(B), keyify(C))) #A,B,C being
> the iterables

Ah, that's not a bad idea.  I think it could be simplified by letting 
Python do the comparison work as follows (also untested).

def keyify(gen, key=lamda x:x):
    for item in gen:
        yield (key(item), item)

def stripify(gen):
    for item in gen:
        yield item[1]

After looking at the heapq.merge code, it seems like something like 
this could easily be added to that code.  If the next() calls were 
wrapped with the tuple creating code above and the yield simply 
returned the item.  It would, of course, have to assume that the 
iterables were sorted using the same key, but that's better than not 
having the key option at all.

-- 
Kevin D. Smith



From anuraguniyal at yahoo.com  Fri May  8 10:53:44 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 8 May 2009 07:53:44 -0700 (PDT)
Subject: unicode bit me
Message-ID: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>

#how can I print a list of object which may return unicode
representation?
# -*- coding: utf-8 -*-

class A(object):

    def __unicode__(self):
        return u"?au"

    __str__ = __repr__ = __unicode__

a = A()

try:
    print a # doesn't work?
except UnicodeEncodeError,e:
    print e
try:
    print unicode(a) # works, ok fine, great
except UnicodeEncodeError,e:
    print e
try:
    print unicode([a]) # what!!!! doesn't work?
except UnicodeEncodeError,e:
    print e
"""
Now how can I print a list of object which may return unicode
representation?
loop/map is not an option as it goes much deepr in my real code
any can anyoen explain what is happening here under the hood?
"""


From gnewsg at gmail.com  Fri May  8 10:57:07 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Fri, 8 May 2009 07:57:07 -0700 (PDT)
Subject: Call a function when a thread exits
References: <5664df89-2966-45e4-a959-f4fc85c2e50f@g20g2000vba.googlegroups.com>
	<eb595814-19c9-44f1-a1de-9c313b0adc18@s31g2000vbp.googlegroups.com>
Message-ID: <13b3dc70-fcc6-48c1-927c-f9f79b6914ae@b1g2000vbc.googlegroups.com>

On 8 Mag, 03:33, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 7, 6:12?pm, "Giampaolo Rodola'" <gne... at gmail.com> wrote:
>
>
>
>
>
> > Hi,
> > I'm searching for a smooth way to call a certain function when a
> > thread has finished its job.
> > I guess I can keep calling isAlive() in a loop and call my function
> > when it returns False but it's not very elegant.
> > Actually I'm a bit surprised it doesn't exists an "atexit" function.
> > Something like:
>
> > import threading, time
>
> > def myfun():
> > ? ? time.sleep(1)
> > ? ? print "hello"
>
> > def cleanup():
> > ? ? print "thread finished, starting cleanup operations..."
>
> > t = threading.Thread(target=myfun)
> > t.atexit(target=cleanup)
> > t.start()
>
> > Is there a reason why there's no such thing in the threading module?
>
> You can define your target function to clean up on exit. ?Using your
> definitions of myfun and cleanup,
>
> def mycleanfun():
> ? ? try:
> ? ? ? ? myfun()
> ? ? finally:
> ? ? ? ? cleanup()
>
> t = threading.Thread(target=mycleanfun)
> t.start()
>
> Carl Banks

Yes, I know. I was wondering if it could be a good idea proposing
something like an atexit() function to be included in threading
module.


--- Giampaolo
http://code.google.com/p/pyftpdlib
http://code.google.com/p/psutil


From Scott.Daniels at Acm.Org  Fri May  8 11:03:57 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 08:03:57 -0700
Subject: Tutorial or example use for python-graph library
In-Reply-To: <030fcef4-2bf5-4194-97f2-78ce95ca4ef5@v17g2000vbb.googlegroups.com>
References: <030fcef4-2bf5-4194-97f2-78ce95ca4ef5@v17g2000vbb.googlegroups.com>
Message-ID: <BZidnUU6s6Y31ZnXnZ2dnUVZ_ridnZ2d@pdx.net>

Paul Moore wrote:
> I have just discovered the python-graph library. I've been interested
> in graph algorithms for a long time, so I'd like to give this a try.
> But there seems to be very little in the way of examples, or tutorial
> documentation available. There's the API documentation, but that's not
> really narrative form. And there are some examples in the
> distribution, but these seem to be essentially artificial examples,
> rather than real-world code (and they don't have much in the way of
> documentation!)
> 
> Are there any reasonably-sized tutorials, or examples of common real-
> world code, using this package? My google-fu wasn't strong enough to
> find anything directly :-(

Try writing one yourself, as you are learning the interface.  The
package authors will love it, and will probably be overjoyed to
help you as you stumble.

--Scott David Daniels
Scott.Daniels at Acm.Org


From ppearson at nowhere.invalid  Fri May  8 11:08:35 2009
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 8 May 2009 15:08:35 GMT
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
	<fbGMl.6972$hd4.4032@newsfe24.ams2>
	<mailman.5238.1241723354.11746.python-list@python.org>
	<lrGMl.6973$hd4.2539@newsfe24.ams2>
	<mailman.5248.1241732704.11746.python-list@python.org>
	<WLSMl.4$3C7.0@newsfe30.ams2>
Message-ID: <76j07jF17rmbsU1@mid.individual.net>

On Fri, 8 May 2009 10:16:55 +0100, Alan Cameron <alan.cameron at iname.com> wrote:
[snip]
>
> In particular reference to the tutorial section
> http://docs.python.org/3.0/tutorial/datastructures.html#nested-list-comprehensions
>
> There is a word which is ambiguous, at least to me.
>
> Perhaps you can explain the use of the word 'comprehensions'.
>
> Comprehension I understand
> Comprehensions I don't.
>
> Is there a glossary of terms somewhere?

"Comprehension", in this context, is a computer-science term, described
in section 5.1.3 of the web page you quoted.  If you look up
"comprehension" in Wikipedia, you'll get a description of various
uses of the term, including a pointer to:
http://en.wikipedia.org/wiki/List_comprehension

-- 
To email me, substitute nowhere->spamcop, invalid->net.


From chambon.pascal at gmail.com  Fri May  8 11:19:13 2009
From: chambon.pascal at gmail.com (Pascal Chambon)
Date: Fri, 08 May 2009 17:19:13 +0200
Subject: php to python code converter
Message-ID: <4A044D71.1000500@gmail.com>

Hello

That's funny, I was precisely thinking about a php to python converter, 
some weeks ago.
Such a tool, allowing for example to convert some CMS like Drupal to 
python, would be a killer app, when we consider the amount of php code 
available.

But of course, there are lots of issues that'd have to be fixed :
- translating the php syntax to python syntax
- forcing scope limitations where php doesn't have any
- handling differences in semantics (for example, the booleanness of "0" 
or)
- handling the automatic variable creation and coertion that php features
- handling the php types like arrays (which are neither python lists nor 
python dicts)
- providing a whole mirror of the php stdlib (string and file functions, 
access to environment vars...)

Some things, like PECL modules, would imo be almost impossible to handle 
(there are already so much trouble to make Cpython extensions available 
to other python implementations...), but I guess that 95% of existing 
php websites could be wholly translated "just" with a language 
translator and an incomplete stddlib replacement.

That's hell a lot of work anyway, so it'd be worth weighing it ^^

Actually, your module "phppython" might already be rather useful, 
because I've crossed here and there people desperately asking for help 
when translating some php function of their own to python.

But if the project were to become bigger, I guess some choices would 
have to be rechecked. For example it seems you parse the php code your 
own way, instead of using existing php parsers ; I think the most 
flexible way would be walking some kind of php abstract syntax tree, and 
translating it to python AST on the way. Also, writting the comments in 
english woudl be mandatory :p

I'd like to have the opinion of people around : do you think that 
complete language translators like php<->python or ruby<->python are 
possible ? Impossible ? Not worth the effort ? Or must be reached by 
another way (eg. Parrot and stuffs) ?

Regards,
Pascal

PS : Am I the only one having most of answers rejected by the antispam 
system of python-list ? That's humiliating :p

bvidinli a ?crit :
> if anybody needs:
> http://code.google.com/p/phppython/
> -- 
> http://mail.python.org/mailman/listinfo/python-list
>
>
>   



From walterbyrd at iname.com  Fri May  8 11:22:22 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Fri, 8 May 2009 08:22:22 -0700 (PDT)
Subject: Path difficulties with Python 2.5 running on Cygwin
Message-ID: <856d93a6-4bbe-4513-b2f2-8e0fa304c797@n7g2000prc.googlegroups.com>

It workerd fine yesterday, but it won't work today.

I can still run python, but when I try to import csv, I get an error:

File "/usr/lib/python2.5/csv.py", line 8 in <module>  . . .

The module is there. I am guessing that python can not find it.


From walterbyrd at iname.com  Fri May  8 11:29:59 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Fri, 8 May 2009 08:29:59 -0700 (PDT)
Subject: Path difficulties with Python 2.5 running on Cygwin
References: <856d93a6-4bbe-4513-b2f2-8e0fa304c797@n7g2000prc.googlegroups.com>
Message-ID: <17a04789-b47e-465e-a715-9b512048405d@u39g2000pru.googlegroups.com>

On May 8, 9:22?am, walterbyrd <walterb... at iname.com> wrote:
> It workerd fine yesterday, but it won't work today.
>
> I can still run python, but when I try to import csv, I get an error:
>
> File "/usr/lib/python2.5/csv.py", line 8 in <module> ?. . .
>
> The module is there. I am guessing that python can not find it.

I should have added:

When I am in /cygdrive/c/Documents and Settings, everything works
fine. But, when I am in /cygdrive/c/Documents and Settings/wbyrd, it
no longer works.

I also get the error: Attribute error: module has no attribute
'reader'

I accidently named a script csv.py, put I deleted that. It seems like
I might need to clear out the python interprator, but I don't know how
to do that.




From mikael at isy.liu.se  Fri May  8 11:33:34 2009
From: mikael at isy.liu.se (Mikael Olofsson)
Date: Fri, 08 May 2009 17:33:34 +0200
Subject: Decorating methods - where do my arguments go?
Message-ID: <gu167u$svk$1@news.lysator.liu.se>

Hi all!

I have long tried to avoid decorators, but now I find myself in a 
situation where I think they can help. I seem to be able to decorate 
functions, but I fail miserably when trying to decorate methods. The 
information I have been able to find on-line focuses on decorating 
functions, and do not mention any special problem regarding methods.

Consider the following example. I start by defining a simple decorator:

 >>> class test_decorator(object):
...     def __init__(self,func):
...         self._func = func
...     def __call__(self, *args):
...         print 'Decorator:', args
...         self._func(*args)

Then I decorate a function:

 >>> @test_decorator
... def func(*args):
...     print 'Function: ', args

Let's try that:

 >>> func(1,2,3)
Decorator: (1, 2, 3)
Function:  (1, 2, 3)

OK! That was what I expected. Let's decorate a method:

 >>> class cls(object):
...     @test_decorator
...     def meth(self,*args):
...         print 'Method:   ', args

Then try that:

 >>> cls().meth(1,2,3)
Decorator: (1, 2, 3)
Method:    (2, 3)

Oops! That's weird. I had expected - or at least wanted - the same 
result as for the function above.

Where did the first argument go? If it was sent to the original method 
meth as the real first argument (self), then why did I not get an exception?

More importantly: How do I write a decorator that does not drop arguments?

I guess it all has to do with the fact that the returned callable isn't 
a method of cls. Is it possible to write a decorator that returns a 
callable that is a method of cls, when used on methods in cls?

/MiO


From Ning.Zhang at centrica.com  Fri May  8 11:35:08 2009
From: Ning.Zhang at centrica.com (Zhang, Ning)
Date: Fri, 8 May 2009 16:35:08 +0100
Subject: SOAPpy(10060, 'Operation timed out')
Message-ID: <07BA348A0DE16649800F91416F354B8E8F5B0E@WC000046A.uk.centricaplc.com>

Hi all

I am working for a energy company, we currently want to use api to load
data into the database.

I am new for soappy package. I have done a bit research on 
http://www.ibm.com/developerworks/webse ... #resources
<http://www.ibm.com/developerworks/webservices/library/ws-pyth16/#resour
ces> 
and
http://www.diveintopython.org/soap_web_ ... gging.html
<http://www.diveintopython.org/soap_web_services/debugging.html> 

I can make none of the examples from tutorial correct.  

I have also tried the the example from Endolith posted last year.

viewtopic.php?f=19&t=10038&p=45872&hilit=soap#p45872
<http://www.python-forum.org/pythonforum/viewtopic.php?f=19&t=10038&p=45
872&hilit=soap#p45872> 

Code: Select all
<http://www.python-forum.org/pythonforum/viewtopic.php?f=5&t=12876##>  

from SOAPpy import WSDL

wsdl_file = 'http://xurrency.com/api.wsdl'
server = WSDL.Proxy(wsdl_file)
values = server.getValuesInverse('usd')



However, I got the error message below:  

error: (10060, 'Operation timed out')

Can anyone kind help me with this issue? Alternatively if anyone could
provide any worked examples, i will be much appreciated.  

Kind regards,
Ning Zhang

 


_____________________________________________________________________
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From malaclypse2 at gmail.com  Fri May  8 11:36:57 2009
From: malaclypse2 at gmail.com (Jerry Hill)
Date: Fri, 8 May 2009 11:36:57 -0400
Subject: Path difficulties with Python 2.5 running on Cygwin
In-Reply-To: <17a04789-b47e-465e-a715-9b512048405d@u39g2000pru.googlegroups.com>
References: <856d93a6-4bbe-4513-b2f2-8e0fa304c797@n7g2000prc.googlegroups.com>
	<17a04789-b47e-465e-a715-9b512048405d@u39g2000pru.googlegroups.com>
Message-ID: <16651e80905080836w2c6e159cu1b44127c9aef0d70@mail.gmail.com>

On Fri, May 8, 2009 at 11:29 AM, walterbyrd <walterbyrd at iname.com> wrote:
> I accidently named a script csv.py, put I deleted that.

You probably still have a stale csv.pyc in that directory.  Delete that too.

To tell for sure, open the python interpreter and do:
import csv
print csv.__file__

That will tell you exactly where the csv module is being loaded from.

-- 
Jerry


From darcy at druid.net  Fri May  8 11:37:20 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Fri, 8 May 2009 11:37:20 -0400
Subject: php to python code converter
In-Reply-To: <4A044D71.1000500@gmail.com>
References: <4A044D71.1000500@gmail.com>
Message-ID: <20090508113720.06d4a48e.darcy@druid.net>

On Fri, 08 May 2009 17:19:13 +0200
Pascal Chambon <chambon.pascal at gmail.com> wrote:
> That's funny, I was precisely thinking about a php to python converter, 
> some weeks ago.
> Such a tool, allowing for example to convert some CMS like Drupal to 
> python, would be a killer app, when we consider the amount of php code 
> available.

I'm not a big fan of PHP but I don't understand the desireability of
such a tool.  If you have a good PHP app just run it.  The point of
Python in my mind is that it is a cleaner syntax and promotes better
code.  Anything that converts PHP to Python is going to leave you with
some butt-ugly Python.  It also risks adding new bugs.

If you want a Python version of Drupal then perhaps that is the project
that you want to start.  Start fresh using the existing project as your
requirements specification.  Don't automatically import all their
coding choices that may be partially based on the language used.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From arnodel at googlemail.com  Fri May  8 11:41:12 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 08 May 2009 16:41:12 +0100
Subject: Code works fine except...
References: <8d4ec1df-dddb-469a-99a1-695152db7c04@n4g2000vba.googlegroups.com>
	<mailman.5023.1241407766.11746.python-list@python.org>
	<7f3493ca-efcb-48cc-aa29-487bb11fcd09@p4g2000vba.googlegroups.com>
	<16d47b2f-14d4-4266-84d2-c26501beb0c1@r34g2000vbi.googlegroups.com>
	<1691f042-bc14-46b9-b7b3-5a44348e9965@b1g2000vbc.googlegroups.com>
	<1a497471-498a-43d8-90ba-d676e8acf68b@r36g2000vbr.googlegroups.com>
	<8b49b775-66a7-42d5-9b00-cf23d9b044cc@e23g2000vbe.googlegroups.com>
	<54d76f11-c255-487d-9c3a-aaa380d7827a@z7g2000vbh.googlegroups.com>
	<fb7323ab-76b9-4758-b2a0-8a7fcb7bb3a9@j12g2000vbl.googlegroups.com>
	<991ccae3-f3e2-4d73-bd32-bc6f560e6f5f@n8g2000vbb.googlegroups.com>
	<fcd0f5d1-81ad-4a05-b4ce-c78fd4abf632@m24g2000vbp.googlegroups.com>
	<mailman.5111.1241544824.11746.python-list@python.org>
	<cc44fa28-6b1e-458c-8692-628d808d8932@n4g2000vba.googlegroups.com>
	<e2fb53d6-89c2-4782-99e3-976225dde3d9@b1g2000vbc.googlegroups.com>
Message-ID: <m2y6t7pppj.fsf@googlemail.com>

John Yeung <gallium.arsenide at gmail.com> writes:

> On May 5, 11:37?pm, Ross <ross.j... at gmail.com> wrote:
>
>> On May 5, 10:33?am, MRAB <goo... at mrabarnett.plus.com> wrote:
>>
>> > Here's my approach (incomplete):
>>
>> FYI... I was testing your code further and discovered a strange
>> outcome... when there are 16 people for 7 courts, every 7th
>> round your code produces 4 byes instead of the correct 2 byes.
>
> Well, MRAB did say his was incomplete, and it's significantly shorter
> and cleaner than mine.
>
> Mine has even weirder-looking behavior at 16 players on 7 courts, but
> I think it's because mine tries harder to keep things balanced.  After
> a few rounds, the inequalities start to build up, and my routine picks
> some people more often to "catch up", but it doesn't prevent the same
> person from being scheduled for multiple matches the same week.  There
> may also be other, more subtle ways mine is broken.
>
> It also may be that the problem is inherently unsolvable for some
> values.  (I'm still waiting for someone with sufficient math ability
> to swoop in and either provide a way that works for all values, or
> confirm that there are just some unavoidable pathological cases.)
>
> John

I was thinking about this problem today.  What is needed is to generate
all matches between n players in an order such that any sequence of
(n//2-1) matches does not repeat any player.  If there are an even
number of players, this guarantees an even distribution of byes as well
(i.e. a difference of at most 1 between the highest and lowest number of
byes).  Unfortunately, if there are an odd number of players, I don't
think this is achievable because there are two sources of byes
unbalance:

* a player needs to be left out of each 'complete round' (where each
  player plays each other'

* some players are left out of each weekly round because there are not
  enough tennis courts for a complete round to be played in one week.

What I believe is achievable in the case of an odd number of players is
a difference of at most two between the highest and the lowest number of
byes for any player at any point in the tournament.

I don't have a proof of this because I haven't had the time to think
about it for long enough, but I have a toy implementation which I have
tested in a very limited manner.  I think it will generate tournaments
with the property that bye imbalance never exceeds 2. I also think it is
not possible to achieve better in general (it's a conjecture!).

----------------------------------------
from itertools import count

def matches(players):
    "Generates all matches between players"
    n = len(players)
    if n % 2:
        for i in xrange(n):
            for j in xrange(1, 1 + n/2):
                yield players[(i+j)%n], players[(i-j)%n]
    else:
        m = n - 1
        for i in xrange(m):
            yield players[-1], players[i]
            for j in xrange(1, n/2):
                yield players[(i+j)%m], players[(i-j)%m]

def print_matches(players):
    for line in zip(*matches(players)):
        print ' '.join(line)

def tournament(players, courts, nrounds=None):
    """
    players: list of players
    courts: list of courts
    nrounds: number of rounds needed or 
    """
    if nrounds is None:
        rounds = count(1)
    else:
        rounds = xrange(1, nrounds + 1)
    opponents = defaultdict(list)
    courts = courts[:len(players)/2]
    get_match = matches(players).next
    try:
        for round in rounds:
            print '-'*10
            print 'Round', round
            for court in courts:
                p1, p2 = get_match()
                print 'Court %s: %s - %s' % (court, p1, p2)
    except StopIteration:
        print "All matches played"
----------------------------------------

Example:

>>> players = ['Ann', 'Bea', 'Clo', 'Dee', 'Evi', 'Fae', 'Gil', 'Haz']
>>> courts = ['One', 'Two', 'Three']
>>> tournament(players, courts, 4)
----------
Round 1
Court One: Haz - Ann
Court Two: Bea - Gil
Court Three: Clo - Fae
----------
Round 2
Court One: Dee - Evi
Court Two: Haz - Bea
Court Three: Clo - Ann
----------
Round 3
Court One: Dee - Gil
Court Two: Evi - Fae
Court Three: Haz - Clo
----------
Round 4
Court One: Dee - Bea
Court Two: Evi - Ann
Court Three: Fae - Gil

HTH

-- 
Arnaud


From Scott.Daniels at Acm.Org  Fri May  8 11:47:11 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 08:47:11 -0700
Subject: unicode bit me
In-Reply-To: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
Message-ID: <0vadnQqkdrdQz5nXnZ2dnUVZ_uOdnZ2d@pdx.net>

anuraguniyal at yahoo.com wrote:
> #how can I print a list of object which may return unicode
> representation?
> # -*- coding: utf-8 -*-
> 
> class A(object):
> 
>     def __unicode__(self):
>         return u"?au"
> 
>     __str__ = __repr__ = __unicode__
> 
> a = A()
> 
> try:
>     print a # doesn't work?
> except UnicodeEncodeError,e:
>     print e
> try:
>     print unicode(a) # works, ok fine, great
> except UnicodeEncodeError,e:
>     print e
> try:
>     print unicode([a]) # what!!!! doesn't work?
> except UnicodeEncodeError,e:
>     print e
> """
> Now how can I print a list of object which may return unicode
> representation?
> loop/map is not an option as it goes much deepr in my real code
> any can anyoen explain what is happening here under the hood?
> """

<rant>It would be a bit easier if people would bother to mention
their Python version, as we regularly get questions from people
running 2.3, 2.4, 2.5, 2.6, 2.7a, 3.0, and 3.1b.  They run computers
with differing operating systems and versions such as: Windows 2000,
OS/X Leopard, ubuntu Hardy Heron, SuSE, ....

You might shocked to learn that a good answer often depends on the
particular situation above.  Even though it is easy to say, for example:
     platform.platform()  returns  'Windows-XP-5.1.2600-SP3'
     sys.version is
'2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit (Intel)]'
</rant>

What is happening is that print is writing to sys.stdout, and
apparently that doesn't know how to send unicode to that destination.
If you are running under IDLE, print goes to the output window, and
if you are running from the command line, it is going elsewhere.
the encoding that is being used for output is sys.stdout.encoding.

--Scott David Daniels
Scott.Daniels at Acm.Org


From Rumpf_A at web.de  Fri May  8 11:48:05 2009
From: Rumpf_A at web.de (Andreas Rumpf)
Date: Fri, 08 May 2009 17:48:05 +0200
Subject: Nimrod programming language
Message-ID: <159308160@web.de>

Dear Python-users,

I invented a new programming language called "Nimrod" that combines Python's readability with C's performance. Please check it out: http://force7.de/nimrod/
Any feedback is appreciated.

Regards,
Andreas Rumpf

______________________________________________________
GRATIS f?r alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!
Jetzt freischalten unter http://movieflat.web.de



From python at bdurham.com  Fri May  8 11:53:37 2009
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 08 May 2009 11:53:37 -0400
Subject: Pythonic way to normalize vertical whitespace
Message-ID: <1241798017.7066.1314483739@webmail.messagingengine.com>

I'm looking for suggestions on technique (not necessarily code)
about the most pythonic way to normalize vertical whitespace in
blocks of text so that there is never more than 1 blank line
between paragraphs. Our source text has newlines normalized to
single newlines (\n vs. combinations of \r and \n), but there may
be leading and trailing whitespace around each newline.
Approaches:
1. split text to list of lines that get stripped then:
a. walk this list building a new list of lines that track and
ignore extra blank lines
-OR-
b. re-join lines and replace '\n\n\n' wth' \n\n' until no more
'\n\n\n' matches exist
2. use regular expressions to match and replace whitespace
pattern of 3 or more adjacent \n's with surrounding whitespace
3. a 3rd party text processing library designed for efficiently
cleaning up text
Thanks!
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From walterbyrd at iname.com  Fri May  8 12:01:53 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Fri, 8 May 2009 09:01:53 -0700 (PDT)
Subject: Path difficulties with Python 2.5 running on Cygwin
References: <856d93a6-4bbe-4513-b2f2-8e0fa304c797@n7g2000prc.googlegroups.com>
	<17a04789-b47e-465e-a715-9b512048405d@u39g2000pru.googlegroups.com> 
	<mailman.5293.1241797020.11746.python-list@python.org>
Message-ID: <7cf3e5c5-1367-4272-af69-fa1d95d48123@b7g2000pre.googlegroups.com>

On May 8, 9:36?am, Jerry Hill <malaclyp... at gmail.com> wrote:
> On Fri, May 8, 2009 at 11:29 AM, walterbyrd <walterb... at iname.com> wrote:
> > I accidently named a script csv.py, put I deleted that.
>
> You probably still have a stale csv.pyc in that directory. ?Delete that too.
>

I don't, I am very certain of that. I have also used find to make
certain there are no other stray versions of csv.py.

> To tell for sure, open the python interpreter and do:
> import csv
> print csv.__file__
>
> That will tell you exactly where the csv module is being loaded from.

Problem is, python will not load the csv module, since it detects an
error. And since I can not load the module, csv.__file__ will not
work.


This file will work:
-----------------
#!/usr/bin/env python

# import csv

print "hello"
------------------


This file will not work:
-----------------
#!/usr/bin/env python

import csv

print "hello"
------------------


In later case, I get that error about 'module' object has no attribute
'reader'


From zondo42 at googlemail.com  Fri May  8 12:02:01 2009
From: zondo42 at googlemail.com (Glenn Hutchings)
Date: Fri, 08 May 2009 17:02:01 +0100
Subject: free chart lib for Python?
References: <mailman.5263.1241750053.11746.python-list@python.org>
Message-ID: <pan.2009.05.08.16.01.57.868847@googlemail.com>

On Fri, 08 May 2009 10:27:08 +0800, oyster wrote:

> I mean chart, not plot. If you don't know the difference, you can
> check www.advsofteng.com, which is a commercial program
> 
> is there such a thing with many kinds of chart, i.e. pie-chart,
> line-chart, ......?

You could try matplotlib: http://matplotlib.sourceforge.net.  That can do
all kinds of wizzo plotty/charty stuff.


From walterbyrd at iname.com  Fri May  8 12:07:42 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Fri, 8 May 2009 09:07:42 -0700 (PDT)
Subject: Path difficulties with Python 2.5 running on Cygwin
References: <856d93a6-4bbe-4513-b2f2-8e0fa304c797@n7g2000prc.googlegroups.com>
	<17a04789-b47e-465e-a715-9b512048405d@u39g2000pru.googlegroups.com> 
	<mailman.5293.1241797020.11746.python-list@python.org>
	<7cf3e5c5-1367-4272-af69-fa1d95d48123@b7g2000pre.googlegroups.com>
Message-ID: <bb5e3b95-8a39-4b1a-b720-0b325fe2262c@d38g2000prn.googlegroups.com>

On May 8, 10:01?am, walterbyrd <walterb... at iname.com> wrote:
> On May 8, 9:36?am, Jerry Hill <malaclyp... at gmail.com> wrote:
>
> > On Fri, May 8, 2009 at 11:29 AM, walterbyrd <walterb... at iname.com> wrote:
> > > I accidently named a script csv.py, put I deleted that.
>
> > You probably still have a stale csv.pyc in that directory. ?Delete that too.
>

Okay, I got it. I was looking for csv.py - because that is what I
accidently created. I don't know where csv.pyc came from, unless
python renamed it that when it tried to load csv.py, or something.

In any case, it seems to work now. Thanks again for your help.


From norseman at hughes.net  Fri May  8 12:09:01 2009
From: norseman at hughes.net (norseman)
Date: Fri, 08 May 2009 09:09:01 -0700
Subject: subprocess.Popen howto?
In-Reply-To: <4A035985.1080806@hughes.net>
References: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>
	<4A035985.1080806@hughes.net>
Message-ID: <4A04591D.5070501@hughes.net>


?ystein ;
         Down below: change >yourPy.py  to | yourPy.py
I just noticed the typo.

Sorry

Steve

norseman wrote:
> ?ystein Johansen (OJOHANS) wrote:
>> Hi,
>>  
>> I have problems understanding the subprocess.Popen object. I have a 
>> iterative calculation in a process running and I want to pipe the 
>> output (stdout) from this calculation to a Python script.
>>  
>> Let me include a simple code that simulates the calculating process:
>> /* This code simulates a big iterative calculation */
>> #include <stdio.h>
>> #include <math.h>
>>  
>> int main()
>> {
>>  float val[2] = { M_PI, M_E };
>>  int i;
>>  
>>  for ( i = 0; i < 2 i++) {
>>   sleep( 15 );   /* It's a hard calculation. It take 15 seconds */
>>   printf("Value: %5.6f\n", val[i] );
>>   fflush( stdout );
>>  }
>>  return 0;
>> }
>>  
>> let's compile this to mycalc: gcc -o mycalc calc.c ... (untested code)
>>  
>> In C I have this code which starts the mycalc process and handles the 
>> output from it:
>>  
>> #include <stdio.h>
>> #include <assert.h>
>> #define BUF_SIZE 256
>>  
>> int main()
>> {
>>  FILE *pip;
>>  char line[BUF_SIZE];
>>  
>>  pip = popen("mycalc", "r");
>>  assert( pip != NULL );
>>  
>>  while ( fgets( line, BUF_SIZE, pip )) {
>>   printf( "Hello; I got: %s \n", line );
>>   fflush( stdout );
>>  }
>>  pclose( pip );
>>  return 0;
>> }
>> How can I make such while-loop in Python? I assume I should use 
>> subprocess.Popen(), but I can't figure out how?
>>  
>> -?ystein
>>  
>>  
>>
>> -------------------------------------------------------------------
>> The information contained in this message may be CONFIDENTIAL and is
>> intended for the addressee only. Any unauthorised use, dissemination 
>> of the
>> information or copying of this message is prohibited. If you are not the
>> addressee, please notify the sender immediately by return e-mail and 
>> delete
>> this message.
>> Thank you.
>>
>>
>> ------------------------------------------------------------------------
>>
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
> ================================
> 
> If you don't like a lot of typing that obscures the process,
> take a look at os.Popen2  Pg.39 or so in Lib.pdf for 2.5.2
> In this case - the popen3 is probably your best bet.
> 
> I took a test run on "subprocess" a few months ago. My review:
> excessive typing to accomplish the simple.  BlackBox stuff is supposed 
> to be short and sweet.
> 
> BlackBox was the term applied to drivers and couplers back when.
> Back when: one started by writing a subroutine that got used.
>            next one got to write a program
>            next one got to write an application
>            then a BlackBox
>            from there one could graduate to OS
> That was back when!
> 
> 
> to repeat from another of my postings:
>                         ---
> processPython 2.5.2 (r252:60911, Mar  4 2008, 10:40:55)
> [GCC 3.3.6] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> 
>  >>> import os
>  >>> AbWd = os.spawnlp( os.P_WAIT,"abiword","abiword","")
> 
> The P_WAIT stops python until the program (abiword in this case) 
> completes.  The "" at the end are for tokens to be given to the program 
> and yes - contrary to manual, the program MUST be there TWICE (complete 
> with any path needed).
> 
> for windows this works:
> (for cut and paste from cmd.exe, see:
>   Re: Copy & Paste in a Dos box  from norseman  05/06/2009 4:28PM
> )
> 
> Python 2.5.1 ... on win32
>  >>> import os
>  >>> result = os.spawnl( os.P_WAIT, "d:\\winmcad\\mcad","")
> 
> Runs the program mcad. Returns to python when mcad exits.
>                         ---
> 
> 
> In your case:  substitute ..."your_compiled_c_program", " >yourPy.py")
>                 at the obvious places.
> 
> In case this isn't clear;
>   method 1:  py1.py starts compiled.c which redirects to yourPy.py
>   method 2:  py1.py uses os.popen3(compiled.c...) & the two work it out.
> In either case the receiver at the end stays open until completion so 
> sleep() things are not needed.  (may need to test for EOL and EOT)
> 
> HTH
> 
> Steve
> norseman at hughes.net
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 



From news.btinternet.com at erik.feegles.net  Fri May  8 12:11:14 2009
From: news.btinternet.com at erik.feegles.net (Basil Brush)
Date: Fri, 08 May 2009 17:11:14 +0100
Subject: Compiling snippets of python code
In-Reply-To: <3pmdnQdqr4ic3JnXnZ2dnUVZ_jWdnZ2d@pdx.net>
References: <RNOdnWjWTNq2jZnXnZ2dnUVZ8g6dnZ2d@bt.com>
	<3pmdnQdqr4ic3JnXnZ2dnUVZ_jWdnZ2d@pdx.net>
Message-ID: <opednRgtt9j9xJnXnZ2dnUVZ8jKdnZ2d@bt.com>

Scott David Daniels wrote:

> make lists and dictionaries containing functions, and that would be
> the normal Python way of handling this, rather than generating source
> from snippets.  You should take a look at Numpy if the "maths functions"

Thank you very much for your response. I hadn't thought of doing it that
way and I feel that would be the best way, especially as a list of maths
functions would make the code for genome recombination and mutation
simpler to rewrite.


Regards,
Erik


From google at mrabarnett.plus.com  Fri May  8 12:27:36 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 08 May 2009 17:27:36 +0100
Subject: Decorating methods - where do my arguments go?
In-Reply-To: <gu167u$svk$1@news.lysator.liu.se>
References: <gu167u$svk$1@news.lysator.liu.se>
Message-ID: <4A045D78.4000908@mrabarnett.plus.com>

Mikael Olofsson wrote:
> Hi all!
> 
> I have long tried to avoid decorators, but now I find myself in a 
> situation where I think they can help. I seem to be able to decorate 
> functions, but I fail miserably when trying to decorate methods. The 
> information I have been able to find on-line focuses on decorating 
> functions, and do not mention any special problem regarding methods.
> 
> Consider the following example. I start by defining a simple decorator:
> 
>  >>> class test_decorator(object):
> ...     def __init__(self,func):
> ...         self._func = func
> ...     def __call__(self, *args):
> ...         print 'Decorator:', args
> ...         self._func(*args)
> 
> Then I decorate a function:
> 
>  >>> @test_decorator
> ... def func(*args):
> ...     print 'Function: ', args
> 
> Let's try that:
> 
>  >>> func(1,2,3)
> Decorator: (1, 2, 3)
> Function:  (1, 2, 3)
> 
> OK! That was what I expected. Let's decorate a method:
> 
>  >>> class cls(object):
> ...     @test_decorator
> ...     def meth(self,*args):
> ...         print 'Method:   ', args
> 
> Then try that:
> 
>  >>> cls().meth(1,2,3)
> Decorator: (1, 2, 3)
> Method:    (2, 3)
> 
> Oops! That's weird. I had expected - or at least wanted - the same 
> result as for the function above.
> 
> Where did the first argument go? If it was sent to the original method 
> meth as the real first argument (self), then why did I not get an 
> exception?
> 
> More importantly: How do I write a decorator that does not drop arguments?
> 
> I guess it all has to do with the fact that the returned callable isn't 
> a method of cls. Is it possible to write a decorator that returns a 
> callable that is a method of cls, when used on methods in cls?
> 
 >>> class cls(object):
     @test_decorator
     def meth(self,*args):
         print 'self:     ', self
         print 'Method:   ', args

 >>> cls().meth(1,2,3)
Decorator: (1, 2, 3)
self:      1
Method:    (2, 3)


From chambon.pascal at wanadoo.fr  Fri May  8 12:27:42 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Fri, 08 May 2009 18:27:42 +0200
Subject: php to python code converter
In-Reply-To: <20090508113720.06d4a48e.darcy@druid.net>
References: <4A044D71.1000500@gmail.com>
	<20090508113720.06d4a48e.darcy@druid.net>
Message-ID: <4A045D7E.8060405@wanadoo.fr>

D'Arcy J.M. Cain a ?crit :
> On Fri, 08 May 2009 17:19:13 +0200
> Pascal Chambon <chambon.pascal at gmail.com> wrote:
>   
>> That's funny, I was precisely thinking about a php to python converter, 
>> some weeks ago.
>> Such a tool, allowing for example to convert some CMS like Drupal to 
>> python, would be a killer app, when we consider the amount of php code 
>> available.
>>     
>
> I'm not a big fan of PHP but I don't understand the desireability of
> such a tool.  If you have a good PHP app just run it.  The point of
> Python in my mind is that it is a cleaner syntax and promotes better
> code.  Anything that converts PHP to Python is going to leave you with
> some butt-ugly Python.  It also risks adding new bugs.
>
> If you want a Python version of Drupal then perhaps that is the project
> that you want to start.  Start fresh using the existing project as your
> requirements specification.  Don't automatically import all their
> coding choices that may be partially based on the language used.
>
>   
I agree that, in any way, the code resulting from this translation would 
be anything but pythonic :p

The point would rather be to consider code translated from php, ruby, 
perl or anything as extension modules, which have to be wrapped with 
pythonic interfaces (much like c/c++ libraries actually), or which are 
supposed to be deeply refactored.
It's always a pity when libraries available in a language have to be 
reproduced in another - even though building the translation tools would 
maybe ask for too much effort.

Concerning applications, like Drupal, it'd be different of course - I 
have no precise plan on how Drupal could be translated and then made 
"maintainable" in python, but for sure Python lacks a similar CMS, 
easier to approach than Plone and much more feature-full than others 
(Slemetonz, Pylucid...). And I don't feel quite ready for implementing 
such a thing myself ^^

Maybe the translation approach isn't the right one ; surely the best 
would be an interoperability at a lower level, like we have in Jpype, 
the DLR of .Net, Parrot, ironclad etc... but even with those projects, 
we're far from a fluent interoperability between languages, which would 
allow you to pick the best modules in the languages that fit the most 
for each of your tasks, on the platform you want  (I guess that's just a 
geeky dream).

Regards,
pascal


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From chambon.pascal at wanadoo.fr  Fri May  8 12:30:47 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Fri, 08 May 2009 18:30:47 +0200
Subject: php to python code converter
Message-ID: <4A045E37.2070304@wanadoo.fr>


D'Arcy J.M. Cain a ?crit :
> On Fri, 08 May 2009 17:19:13 +0200
> Pascal Chambon <chambon.pascal at gmail.com> wrote:
>   
>> That's funny, I was precisely thinking about a php to python converter, 
>> some weeks ago.
>> Such a tool, allowing for example to convert some CMS like Drupal to 
>> python, would be a killer app, when we consider the amount of php code 
>> available.
>>     
>
> I'm not a big fan of PHP but I don't understand the desireability of
> such a tool.  If you have a good PHP app just run it.  The point of
> Python in my mind is that it is a cleaner syntax and promotes better
> code.  Anything that converts PHP to Python is going to leave you with
> some butt-ugly Python.  It also risks adding new bugs.
>
> If you want a Python version of Drupal then perhaps that is the project
> that you want to start.  Start fresh using the existing project as your
> requirements specification.  Don't automatically import all their
> coding choices that may be partially based on the language used.
>
>   
I agree that, in any way, the code resulting from this translation would 
be anything but pythonic :p

The point would rather be to consider code translated from php, ruby, 
perl or anything as extension modules, which have to be wrapped with 
pythonic interfaces (much like c/c++ libraries actually), or which are 
supposed to be deeply refactored.
It's always a pity when libraries available in a language have to be 
reproduced in another - even though building the translation tools would 
maybe ask for too much effort.

Concerning applications, like Drupal, it'd be different of course - I 
have no precise plan on how Drupal could be translated and then made 
"maintainable" in python, but for sure Python lacks a similar CMS, 
easier to approach than Plone and much more feature-full than others 
(Slemetonz, Pylucid...). And I don't feel quite ready for implementing 
such a thing myself ^^

Maybe the translation approach isn't the right one ; surely the best 
would be an interoperability at a lower level, like we have in Jpype, 
the DLR of .Net, Parrot, ironclad etc... but even with those projects, 
we're far from a fluent interoperability between languages, which would 
allow you to pick the best modules in the languages that fit the most 
for each of your tasks, on the platform you want  (I guess that's just a 
geeky dream).

Regards,
pascal


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From cgoldberg at gmail.com  Fri May  8 12:32:31 2009
From: cgoldberg at gmail.com (cgoldberg)
Date: Fri, 8 May 2009 09:32:31 -0700 (PDT)
Subject: free chart lib for Python?
References: <mailman.5263.1241750053.11746.python-list@python.org> 
	<pan.2009.05.08.16.01.57.868847@googlemail.com>
Message-ID: <abfaccb1-3ec9-4c4b-bca3-8ecd5d110f05@t10g2000vbg.googlegroups.com>

> You could try matplotlib:http://matplotlib.sourceforge.net.

+1 Matplotlib.
It's a very nice module with impressive graphing/charting/plotting
capabilities.


From dotancohen at gmail.com  Fri May  8 12:33:10 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Fri, 8 May 2009 19:33:10 +0300
Subject: php to python code converter
In-Reply-To: <20090508113720.06d4a48e.darcy@druid.net>
References: <4A044D71.1000500@gmail.com>
	<20090508113720.06d4a48e.darcy@druid.net>
Message-ID: <880dece00905080933t4379ab21h3973e8d624769d06@mail.gmail.com>

> I'm not a big fan of PHP but I don't understand the desireability of
> such a tool. ?If you have a good PHP app just run it. ?The point of
> Python in my mind is that it is a cleaner syntax and promotes better
> code. ?Anything that converts PHP to Python is going to leave you with
> some butt-ugly Python. ?It also risks adding new bugs.
>
> If you want a Python version of Drupal then perhaps that is the project
> that you want to start. ?Start fresh using the existing project as your
> requirements specification. ?Don't automatically import all their
> coding choices that may be partially based on the language used.
>

It would be a great learning tool. I am pretty decent with PHP but
just getting started in Python. This might help such users flatten out
the learning curve.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il


From Shawn at Milochik.com  Fri May  8 12:36:12 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Fri, 8 May 2009 12:36:12 -0400
Subject: xml in python
In-Reply-To: <f46c52560905080046t4b9611vb304df22703eb744@mail.gmail.com>
References: <f46c52560905080046t4b9611vb304df22703eb744@mail.gmail.com>
Message-ID: <2dc0c81b0905080936m7cf9aaecn243d2b9c17cc3b8@mail.gmail.com>

On Fri, May 8, 2009 at 3:46 AM, Rustom Mody <rustompmody at gmail.com> wrote:
> Can someone give me a heads up on xml parsing in python?
> The context is that I want to write a simple docbook to text converter.
> DOM is alright -- dont want to break my head with SAX just for performance
> when my documents are not likely to be large.
>
> My problem is that there seems to be so many nearly equivalent ways (Pyxml?
> Amara?) some of which have moved from 3rd party to builtin status that I am
> not clear what is the current method of choice.
>
> Thanks
> --

I've been using minidom for simple XML processing with success. The
XML module seems to be the way to go, considering how many of its
child modules are listed on http://docs.python.org/library/.

import xml.dom.minidom as minidom

Shawn


From andrew at acooke.org  Fri May  8 12:38:33 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 8 May 2009 12:38:33 -0400 (CLT)
Subject: SQL and CSV
In-Reply-To: <b7c68e74-21ae-4133-a058-e3c669f0faf6@o20g2000vbh.googlegroups.com>
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
	<gu0ofm$oj9$00$1@news.t-online.com> <gu141o$iek$4@lust.ihug.co.nz>
	<mailman.5285.1241786958.11746.python-list@python.org>
	<b7c68e74-21ae-4133-a058-e3c669f0faf6@o20g2000vbh.googlegroups.com>
Message-ID: <7aae1530c7ea92c927154597c34c49cc.squirrel@localhost>


even if you're not open to injection attacks, you're still less likely to
get escaping correct than a puprose written, widely used library.

my request for more information was directed to lawrence, who said "until
you hit things it can't deal with" which seemed to be some kind of cryptic
argument against parameters.

andrew


Nick wrote:
> On May 8, 1:49?pm, "andrew cooke" <and... at acooke.org> wrote:
>> Lawrence D'Oliveiro wrote:
>> > In message <gu0ofm$oj9$0... at news.t-online.com>, Peter Otten wrote:
>>
>> >> While it may not matter here using placeholders instead of manually
>> >> escaping user-provided values is a good habit to get into.
>>
>> > Until you hit things it can't deal with.
>>
>> The post you are replying to was talking about using the SQL library's
>> "?"
>> syntax that automatically escapes values. ?The usual reason this is
>> recommended (if I have understood correctly) is that the library code is
>> much more likely to foil injection attacks. ?I have seen this mentioned
>> often and assume it is good advice.
>>
>> Can you expand on your comment? ?I assume you are thinking of how the
>> library might handle some strange class. ?But aren't the number of types
>> limited by SQL? ?In which case a "thing that can't be handled" could
>> presumably be managed by adding an appropriate __str__ or __float__ or
>> whatever? ?And you would still use the library to give safety with other
>> values.
>>
>> Maybe you could give an example of the kind of problem you're thinking
>> of?
>>
>> Thanks,
>> Andrew
>
> Injection attacks aren't an issue, its a local app.
>
> It's part of a reconciliation system, where sometimes data is in csv
> files. If you want the whole csv file, you can use csv module without
> a problem.
>
> In some cases, I need to manipulate the data.
>
> The choices are hard code the manipulation, or load the data from a
> config file.
>
> So what I've got is the query in the config and I can process it.
>
> Nick
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From __peter__ at web.de  Fri May  8 12:39:29 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 08 May 2009 18:39:29 +0200
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
Message-ID: <gu1n81$ir7$03$1@news.t-online.com>

Mikael Olofsson wrote:

> Hi all!
> 
> I have long tried to avoid decorators, but now I find myself in a
> situation where I think they can help. I seem to be able to decorate
> functions, but I fail miserably when trying to decorate methods. The
> information I have been able to find on-line focuses on decorating
> functions, and do not mention any special problem regarding methods.
> 
> Consider the following example. I start by defining a simple decorator:
> 
>  >>> class test_decorator(object):
> ...     def __init__(self,func):
> ...         self._func = func
> ...     def __call__(self, *args):
> ...         print 'Decorator:', args
> ...         self._func(*args)
> 
> Then I decorate a function:
> 
>  >>> @test_decorator
> ... def func(*args):
> ...     print 'Function: ', args
> 
> Let's try that:
> 
>  >>> func(1,2,3)
> Decorator: (1, 2, 3)
> Function:  (1, 2, 3)
> 
> OK! That was what I expected. Let's decorate a method:
> 
>  >>> class cls(object):
> ...     @test_decorator
> ...     def meth(self,*args):
> ...         print 'Method:   ', args
> 
> Then try that:
> 
>  >>> cls().meth(1,2,3)
> Decorator: (1, 2, 3)
> Method:    (2, 3)
> 
> Oops! That's weird. I had expected - or at least wanted - the same
> result as for the function above.
> 
> Where did the first argument go? If it was sent to the original method
> meth as the real first argument (self), then why did I not get an
> exception?
> 
> More importantly: How do I write a decorator that does not drop arguments?
> 
> I guess it all has to do with the fact that the returned callable isn't
> a method of cls. Is it possible to write a decorator that returns a
> callable that is a method of cls, when used on methods in cls?
> 
> /MiO

You have to turn your decorator into a descriptor by providing a __get__() 
method. A primitive example:

class test_decorator(object):
    def __init__(self,func):
        self._func = func
    def __call__(self, *args):
        print 'Decorator:', args
        self._func(self.inst, *args)
    def __get__(self, inst, cls):
        self.inst = inst
        return self

Read more about the details at

http://users.rcn.com/python/download/Descriptor.htm

Peter



From Scott.Daniels at Acm.Org  Fri May  8 12:44:37 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 09:44:37 -0700
Subject: Path difficulties with Python 2.5 running on Cygwin
In-Reply-To: <bb5e3b95-8a39-4b1a-b720-0b325fe2262c@d38g2000prn.googlegroups.com>
References: <856d93a6-4bbe-4513-b2f2-8e0fa304c797@n7g2000prc.googlegroups.com>
	<17a04789-b47e-465e-a715-9b512048405d@u39g2000pru.googlegroups.com>
	<mailman.5293.1241797020.11746.python-list@python.org>
	<7cf3e5c5-1367-4272-af69-fa1d95d48123@b7g2000pre.googlegroups.com>
	<bb5e3b95-8a39-4b1a-b720-0b325fe2262c@d38g2000prn.googlegroups.com>
Message-ID: <RZidnfvE3Ybf_ZnXnZ2dnUVZ_gudnZ2d@pdx.net>

walterbyrd wrote:
> On May 8, 10:01 am, walterbyrd <walterb... at iname.com> wrote:
>> On May 8, 9:36 am, Jerry Hill <malaclyp... at gmail.com> wrote:
>>
>>> On Fri, May 8, 2009 at 11:29 AM, walterbyrd <walterb... at iname.com> wrote:
>>>> I accidently named a script csv.py, put I deleted that.
>>> You probably still have a stale csv.pyc in that directory.  Delete that too.
> Okay, I got it. I was looking for csv.py - because that is what I
> accidently created. I don't know where csv.pyc came from, unless
> python renamed it that when it tried to load csv.py, or something.

You _need_ to understand where csv.pyc came from, or you will hit
this problem frequently.

When you import any module in python, the python interpreter looks
for a "compiled" version of that mdule -- a .pyc (or when optimizing
.pyo) file.  If it finds it, it checks that it was compiled from the
corresponding .py (or .pyw) file.  If no .pyc is found, or if the
.pyc that was found doesn't match the corresponding .py file, the
.py (or .pyw) file is "compiled into either a .pyc or .pyo, and the
contents of that .pyc or .pyo are used to build the module.

So, importing a module will write a .pyc or .pyo file unless an
appropriate .pyc or .pyo file is found.

--Scott David Daniels
Scott.Daniels at Acm.Org


From iwan at reahl.org  Fri May  8 13:01:57 2009
From: iwan at reahl.org (Iwan Vosloo)
Date: Fri, 08 May 2009 19:01:57 +0200
Subject: How to debug this import problem?
Message-ID: <1241802117.7241.37.camel@easymoney>

Hi there,

We have a rather complicated program which does a bit of os.chdir and
sys.path manipulations.  In between all of this, it imports the decimal
module several times.

However, it imports a new instance of decimal sometimes.  (Which is a
problem, since a decimal.Decimal (imported at point A) now is not the
same as that imported somewhere else.

In trying to figure out what's happening, we've changed the code in
decimal to print out id(sys) when decimal gets imported.  This also
gives back different values at different times.  My suspicion is that
when importing python tries to check sys.modules - but each time sys is
a different sys already.

Any ideas of how we can gather more data to find out exactly what causes
this? The path manipulations is a suspect, but unfortunately we cannot
remove it.  If we can trace the problem from the import end though, we
may be able to isolate the exact one which is the problem.

This code incidentally also runs in a virtualenv environment AND uses
setuptools.  None of these complications can be removed...

Regards
- Iwan



From enricong at gmail.com  Fri May  8 13:04:09 2009
From: enricong at gmail.com (enricong at gmail.com)
Date: Fri, 8 May 2009 10:04:09 -0700 (PDT)
Subject: building 32-bit PyQT4 and matplotlib on X86_64
Message-ID: <038e847e-49aa-4cef-b2f6-20ef93fed62d@q14g2000vbn.googlegroups.com>

I'm having some issues attempting to build PyQT4 and matplotlib.  I'm
on a 64-bit machine and am trying to build a 32-bit version.  I have
already installed seperate 32-bit libs and a 32-bit version of python
however I continue to run into two basic problems

With PyQT4, I dont know how to tell it that I want to compile 32bit.
I run into a problem at the very beginning when it runts qtdirs.mk and
there -m32 isnt there.  I tried adding it in and manually running
make, but then I have the second problem

with matplotlib and PyQT4, eventhough the "-m32" flag is being used
with g++ and /usr/lib is included in the library search path, I run
into problems where I get a message saying something like:

/usr/bin/ld: skipping incompatible /usr/lib64/libz.so when searching
for -lz
then
/usr/bin/ld: cannot find -lz

I had this exact problem with a few modules while trying to build
Python 32 bit, however I was able to substitude -lz with the full path
to the library /usr/lib/libz.so.1

This would be impractical to do with matplotlib.
This is also just one example, I have problems with other libraries
too.




From aahz at pythoncraft.com  Fri May  8 13:14:48 2009
From: aahz at pythoncraft.com (Aahz)
Date: 8 May 2009 10:14:48 -0700
Subject: How do I test the integrity of a Python installation in Debian and
	Ubuntu
References: <mailman.5282.1241783298.11746.python-list@python.org>
Message-ID: <gu1pa8$4mj$1@panix3.panix.com>

In article <mailman.5282.1241783298.11746.python-list at python.org>,
Geoff Gardiner  <ggardiner at iee.org> wrote:
>
>How do I assure myself of the integrity of a Python installation
>acquired using apt-get install on Debian and Ubuntu?

How important is the apt-get requirement?  Building Python yourself in
this situation sounds like it would be simpler/safer.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From marco.mandl at gmx.at  Fri May  8 13:14:52 2009
From: marco.mandl at gmx.at (Marco)
Date: Fri, 08 May 2009 19:14:52 +0200
Subject: import overwrites __name__
Message-ID: <gu1pad$afi$1@ger.gmane.org>

Hi,

There happened something that I do not understand. Actually I don't even 
know how it can be possible.

I import a module and then the name space of the importing module seems do 
be overwritten.

my_name = __name__
print my_name
print len(dir())
from x import y as z
print __name__
print len(dir())
print my_name

->
__main__
119
x
117
unhandled NameError "name 'my_name' is not defined"

The module x is from me, and I am not aware of doing anything cruel there. 
What evil thing can be done in its sub module that can result in that 
strange thing?

br
Marco




From darcy at druid.net  Fri May  8 13:28:45 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Fri, 8 May 2009 13:28:45 -0400
Subject: php to python code converter
In-Reply-To: <880dece00905080933t4379ab21h3973e8d624769d06@mail.gmail.com>
References: <4A044D71.1000500@gmail.com>
	<20090508113720.06d4a48e.darcy@druid.net>
	<880dece00905080933t4379ab21h3973e8d624769d06@mail.gmail.com>
Message-ID: <20090508132845.0b3a1976.darcy@druid.net>

On Fri, 8 May 2009 19:33:10 +0300
Dotan Cohen <dotancohen at gmail.com> wrote:
> It would be a great learning tool. I am pretty decent with PHP but
> just getting started in Python. This might help such users flatten out
> the learning curve.

If there were such a tool available I would sugegst it come with huge
warnings suggesting that the resulting code not be used for learning
purposes.  You would still be much better off with the tutorials.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From gagsl-py2 at yahoo.com.ar  Fri May  8 13:28:50 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 08 May 2009 14:28:50 -0300
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au>
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com>
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com>
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar>
	<op.uti1kf0ga8ncjz@gnudebst> <1241649200.4a0210301f77e@mail.uh.cu>
	<mailman.5189.1241657949.11746.python-list@python.org>
	<pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au>
	<1241663543.4a024837a9680@mail.uh.cu>
Message-ID: <op.utmf6dddx6zn5v@gabriel.sleipnir-bsas>

En Wed, 06 May 2009 23:32:23 -0300, Luis Alberto Zarrabeitia Gomez  
<kyrie at uh.cu> escribi?:

>
> Quoting Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>:
>
>> But regardless, everyone is missing the most important point: why are  
>> you
>> copying and pasting code in the first place? That is surely very close  
>> to
>> the top of the list of Worst Ever Anti-Patterns, and it should be  
>> avoided
>> whenever possible.
>
> [btw, I took this long before jumping into this thread for this precise
> reason... Copy/paste is an evil anti-pattern.
>
>> In Python, we can avoid much copy-and-paste coding with decorators.  
>> Given
>> one function, we can create as many variants as we want, differing in  
>> pre-
>> processing of arguments and post-processing of results, by using
>> decorators. This is a powerful ability to have, but it's crippled for
>> many recursive functions, because recursive functions in Python don't
>> actually call themselves, they call whatever happens to be bound to  
>> their
>> name at runtime.
>
> A bit offtopic: a while ago I think I saw a recipe for a decorator that,  
> via
> bytecode hacks, would bind otherwise global names to the local namespace  
> of the
> function. Can anyone remember it/point me to it? An @bind decorator that  
> would
> 'localize' all the global names, including the still unexistent but  
> already know
> function name, would guarantee that at least recursion calls the same  
> function
> instead of "whatever happens to be bound to their name at runtime". If  
> it wasn't
> a hack, anyway.

I could not find such thing, but here it is something similar (mostly a  
proof-of-concept).
Basically, modifies the bytecode so global references become local ones,  
and then injects a new argument whose default value is the desired value.  
It can be used to make all references to the function name to refer to the  
function itself; also, the __function__ variant can be implemented.

<code>
 from opcode import HAVE_ARGUMENT, opmap

def iter_code(co):
   """Iterate over a code object."""
   code = co.co_code
   n = len(code)
   i = 0
   while i < n:
     op = ord(code[i])
     if op >= HAVE_ARGUMENT:
       oparg = ord(code[i+1]) + ord(code[i+2])*256
       yield code[i:i+3], op, oparg
       i += 3
     else:
       yield code[i], op, None
       i += 1

def replace_bytecode(code, iname_global, iname_local):
   LOAD_GLOBAL = opmap['LOAD_GLOBAL']
   LOAD_FAST = opmap['LOAD_FAST']
   STORE_GLOBAL = opmap['STORE_GLOBAL']
   STORE_FAST = opmap['STORE_FAST']
   for codestr, op, oparg in iter_code(code):
     if op==LOAD_GLOBAL and oparg==iname_global:
       codestr = chr(LOAD_FAST) + chr(iname_local % 256) + chr(iname_local  
// 256)
     elif op==STORE_GLOBAL and oparg==iname_global:
       codestr = chr(STORE_FAST) + chr(iname_local % 256) + chr(iname_local  
// 256)
     yield(codestr)

class GlobalToLocalWarning(RuntimeWarning): pass

def global_to_local(function, refname, value):
   """
   Make all references to `refname` local instead of global.
   Actually, transform
     def function(a,b,c):
   into
     def function(a,b,c,refname=value)
   """
   code = function.func_code
   if refname not in code.co_names:
     import warnings
     warnings.warn(GlobalToLocalWarning('no reference to "%s" found in %s'  
% (refname, function.func_name)), stacklevel=2)
     return function
   # insert refname just after the last argument
   varnames = list(code.co_varnames)
   varnames.insert(code.co_argcount, refname)
   # new bytecode using LOAD_FAST instead of LOAD_GLOBAL
   iname_global = code.co_names.index(refname) # LOAD_GLOBAL/STORE_GLOBAL  
operand
   iname_local = code.co_argcount # LOAD_FAST/STORE_FAST operand
   rawcode = ''.join(replace_bytecode(code, iname_global, iname_local))
   function.func_code = type(code)(
      code.co_argcount + 1,
      code.co_nlocals + 1,
      code.co_stacksize,
      code.co_flags,
      rawcode,
      code.co_consts,
      code.co_names,
      tuple(varnames),
      code.co_filename,
      code.co_name,
      code.co_firstlineno,
      code.co_lnotab
      )
   # the desired value is the default value of the new, fake argument
   if function.func_defaults is None:
     function.func_defaults = (value,)
   else:
     function.func_defaults += (value,)
   return function

# decorator: function name refers to itself
def recursive3(function):
   return global_to_local(function, function.func_name, function)

@recursive3
def fibo(n):
   if n<=1: return 1
   return fibo(n-1) + fibo(n-2)
   # those "fibo" won't be global anymore

# decorator: name '__function__' refers to function
def recursive4(function):
   return global_to_local(function, '__function__', function)

def factorial(n):
   @recursive4
   def _factorial(n, acc):
     if n<=1: return acc
     return __function__(n-1, n*acc)
   return _factorial(n, 1)

print fibo, fibo.__name__, fibo.func_name, fibo.func_code.co_name
assert fibo(5)==8
F10=factorial(10)
assert F10==2*3*4*5*6*7*8*9*10

foo = fibo
bar = factorial
del fibo, factorial
assert foo(5)==8
assert bar(10)==F10

import inspect
assert inspect.getargspec(foo).defaults[0] is foo
</code>

-- 
Gabriel Genellina



From norseman at hughes.net  Fri May  8 13:32:34 2009
From: norseman at hughes.net (norseman)
Date: Fri, 08 May 2009 10:32:34 -0700
Subject: subprocess.Popen howto?
In-Reply-To: <3aaa4e6e-c2c0-43e0-a483-7c79c46137a9@s16g2000vbp.googlegroups.com>
References: <B4DE1753D7E2B346899F5EC860DEC1B60133127C@ST-EXCL05.statoil.net>
	<mailman.5249.1241733498.11746.python-list@python.org>
	<3aaa4e6e-c2c0-43e0-a483-7c79c46137a9@s16g2000vbp.googlegroups.com>
Message-ID: <4A046CB2.3080101@hughes.net>

Carl Banks wrote:
> On May 7, 2:58 pm, norseman <norse... at hughes.net> wrote:
>> If you don't like a lot of typing that obscures the process,
>> take a look at os.Popen2  Pg.39 or so in Lib.pdf for 2.5.2
>> In this case - the popen3 is probably your best bet.
>>
>> I took a test run on "subprocess" a few months ago. My review:
>> excessive typing to accomplish the simple.
> 
> 
> Hmm, I won't argue that it can be excessive typing, but I think its
> purpose isn't to accomplish the simple but to hit all the corners of
> subprocesses.
> 
> What if you want os.system without the shell?  What if you want popen
> with the shell?  On Windows what if I want a subprocess without a
> console from a Python program in a console.  Stuff like that.
> 
Shell?  You lost me.
Why would you even use Windows?  Just kidding.
   Build the TSR and Start from Python or the bootup autostart
   and use it from Python or whatever.
Those in Unix, put the " &" after the program name in the starter
   to get it to background. Be sure to use P_NOWAIT in the starter.

> I still use os.system for Q&D stuff, but now use subprocess for
> everything else since I prefer thorough to short and sweet.

As long as speed (volume vs time) isn't a problem - OK.

> 
> 
> Carl Banks
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
==================================

         1)  That one has access to and can make for ones self choices is
               freedom.
         2)  As far as forcing a 'do all' into use is concerned,
               especially at the expense of removing others choices
               (Python notes say subprocess is supplanting popen et al),
               well... that is dictitorial, anti-freedom.
         3)  Consider this: a do all is as useful as driving a Ferrari on
               a Jeep Jamboree cross crountry race. Or chasing a Ferrari
               through paved mountain roads with a Jeep.  The SUV is
               supposed to be a "do all". Would you actually expect it to
               win either race?  After all, they are all "cars".
Use/create the proper tool for the job. I do not know any good mechanics 
that have a monkey-wrench (a crescent) in their tool box.  And all of 
them will tell you that the guy who picks one up and starts toward the 
car may be upset with the driver but he is not a mechanic.
(Wrong tool of choice. Besides, should not have been available. :)
(Use the long handle 1/2" socket drive ratchet. Weight, length and 
balance are just right. ;)

Everybody - Read #1 one more time and make it (speak out loud) "my way".
If the client is happy, who cares how it was done?  But don't force 
others ....  (Python admins taking notes?)

Steve



From deets at nospam.web.de  Fri May  8 13:39:31 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 08 May 2009 19:39:31 +0200
Subject: How to debug this import problem?
References: <mailman.5300.1241802485.11746.python-list@python.org>
Message-ID: <76j8vcF1crfkoU1@mid.uni-berlin.de>

Iwan Vosloo wrote:

> Hi there,
> 
> We have a rather complicated program which does a bit of os.chdir and
> sys.path manipulations.  In between all of this, it imports the decimal
> module several times.
> 
> However, it imports a new instance of decimal sometimes.  (Which is a
> problem, since a decimal.Decimal (imported at point A) now is not the
> same as that imported somewhere else.
> 
> In trying to figure out what's happening, we've changed the code in
> decimal to print out id(sys) when decimal gets imported.  This also
> gives back different values at different times.  My suspicion is that
> when importing python tries to check sys.modules - but each time sys is
> a different sys already.
> 
> Any ideas of how we can gather more data to find out exactly what causes
> this? The path manipulations is a suspect, but unfortunately we cannot
> remove it.  If we can trace the problem from the import end though, we
> may be able to isolate the exact one which is the problem.
> 
> This code incidentally also runs in a virtualenv environment AND uses
> setuptools.  None of these complications can be removed...

Try putting an "import pdb; pdb.set_trace()" on top of the decimal module.
Then you can see whenever it gets imported new, and with "bt" get a
backtrace, and you can inspect (and thus eventually compare) the various
states of sys.path and sys.modules.

Diez



From deets at nospam.web.de  Fri May  8 13:43:50 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 08 May 2009 19:43:50 +0200
Subject: php to python code converter
References: <4A044D71.1000500@gmail.com>
	<20090508113720.06d4a48e.darcy@druid.net>
	<mailman.5298.1241800394.11746.python-list@python.org>
Message-ID: <76j97fF1crfkoU2@mid.uni-berlin.de>

Dotan Cohen wrote:

>> I'm not a big fan of PHP but I don't understand the desireability of
>> such a tool. ?If you have a good PHP app just run it. ?The point of
>> Python in my mind is that it is a cleaner syntax and promotes better
>> code. ?Anything that converts PHP to Python is going to leave you with
>> some butt-ugly Python. ?It also risks adding new bugs.
>>
>> If you want a Python version of Drupal then perhaps that is the project
>> that you want to start. ?Start fresh using the existing project as your
>> requirements specification. ?Don't automatically import all their
>> coding choices that may be partially based on the language used.
>>
> 
> It would be a great learning tool. I am pretty decent with PHP but
> just getting started in Python. This might help such users flatten out
> the learning curve.

I'm almost 100% sure it won't. The code is machine-generated, thus not easy
to the human eye, not idiomatic so you don't learn how to write good python
through it. You learn how to jump through hoops to code the same way in
python that you do in PHP.

Diez



From dotancohen at gmail.com  Fri May  8 14:03:35 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Fri, 8 May 2009 21:03:35 +0300
Subject: php to python code converter
In-Reply-To: <76j97fF1crfkoU2@mid.uni-berlin.de>
References: <4A044D71.1000500@gmail.com>
	<20090508113720.06d4a48e.darcy@druid.net>
	<mailman.5298.1241800394.11746.python-list@python.org>
	<76j97fF1crfkoU2@mid.uni-berlin.de>
Message-ID: <880dece00905081103i4e6127c4kd8e6c60642bb69ef@mail.gmail.com>

> I'm almost 100% sure it won't. The code is machine-generated, thus not easy
> to the human eye, not idiomatic so you don't learn how to write good python
> through it. You learn how to jump through hoops to code the same way in
> python that you do in PHP.
>

I meant for single functions, not for translating entire apps.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il


From gruszczy at gmail.com  Fri May  8 14:04:17 2009
From: gruszczy at gmail.com (=?UTF-8?Q?Filip_Gruszczy=C5=84ski?=)
Date: Fri, 8 May 2009 20:04:17 +0200
Subject: ECG segmentation
Message-ID: <1be78d220905081104s64e7191na38e3517b24828d8@mail.gmail.com>

Hi!

I need to create a script, that performs ECG segmentation, but I can
hardly find any useful materials on the web. Did anyone try to do this
and could point me to some good materials/snippets about this?

-- 
Filip Gruszczy?ski


From musicguy at alphaios.net  Fri May  8 14:05:45 2009
From: musicguy at alphaios.net (The Music Guy)
Date: Fri, 8 May 2009 13:05:45 -0500
Subject: FLV download script works, but I want to enhance it
In-Reply-To: <gtur8q$b2n$1@panix3.panix.com>
References: <mailman.5134.1241579669.11746.python-list@python.org> 
	<gtur8q$b2n$1@panix3.panix.com>
Message-ID: <f61e9a8c0905081105o73ee4a8xd89fc67019187ba7@mail.gmail.com>

On Thu, May 7, 2009 at 9:29 AM, Aahz <aahz at pythoncraft.com> wrote:
>
> Here's my download script to get you started figuring this out, it does
> the wget in the background so that several downloads can run in parallel
> from a single terminal window:
>
> #!/bin/bash
>
> echo "Downloading $1"
> wget "$1" > /dev/null 2>&1 &
> --
> Aahz (aahz at pythoncraft.com) ? ? ? ? ? <*> ? ? ? ? http://www.pythoncraft.com/
>
> "It is easier to optimize correct code than to correct optimized code."
> --Bill Harlan
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Aahz,

Thanks for the reply, but unfortunately that script is going in the
complete wrong direction.

Firstly, downloading multiple files in tandem does not speed up the
process as it merely cuts up the already limited bandwidth into even
smaller pieces and delays every download in progress. It is much
better to queue downloads to occur one-by-one.

Secondly, that approach is based on bash rather than Python. I know I
could use the `&` operator on a command line to background processes,
but I would like to be able to have more control through Python and
the use of the subprocess or threading modules.


From google at mrabarnett.plus.com  Fri May  8 14:10:48 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 08 May 2009 19:10:48 +0100
Subject: import overwrites __name__
In-Reply-To: <gu1pad$afi$1@ger.gmane.org>
References: <gu1pad$afi$1@ger.gmane.org>
Message-ID: <4A0475A8.4060206@mrabarnett.plus.com>

Marco wrote:
> Hi,
> 
> There happened something that I do not understand. Actually I don't even 
> know how it can be possible.
> 
> I import a module and then the name space of the importing module seems do 
> be overwritten.
> 
> my_name = __name__
> print my_name
> print len(dir())
> from x import y as z
> print __name__
> print len(dir())
> print my_name
> 
> ->
> __main__
> 119
> x
> 117
> unhandled NameError "name 'my_name' is not defined"
> 
> The module x is from me, and I am not aware of doing anything cruel there. 
> What evil thing can be done in its sub module that can result in that 
> strange thing?
> 
You'd have to show us the module. Try to make the smallest module that
has the same effect.


From Scott.Daniels at Acm.Org  Fri May  8 14:21:24 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 11:21:24 -0700
Subject: How to debug this import problem?
In-Reply-To: <76j8vcF1crfkoU1@mid.uni-berlin.de>
References: <mailman.5300.1241802485.11746.python-list@python.org>
	<76j8vcF1crfkoU1@mid.uni-berlin.de>
Message-ID: <DumdnY8P7-xs65nXnZ2dnUVZ_jidnZ2d@pdx.net>

Diez B. Roggisch wrote:
> Iwan Vosloo wrote:
>> We have a rather complicated program which does a bit of os.chdir and
>> sys.path manipulations.  In between all of this, it imports the decimal
>> module several times....
>> However, it imports a new instance of decimal sometimes.  (Which is a
>> problem, since a decimal.Decimal (imported at point A) now is not the
>> same as that imported somewhere else....
>>
>> In trying to figure out what's happening, we've changed the code in
>> decimal to print out id(sys) when decimal gets imported.  This also
>> gives back different values at different times.  My suspicion is that
>> when importing python tries to check sys.modules - but each time sys is
>> a different sys already.
>>
>> Any ideas of how we can gather more data to find out exactly what causes
>> this? The path manipulations is a suspect, but unfortunately we cannot
>> remove it.  If we can trace the problem from the import end though, we
>> may be able to isolate the exact one which is the problem.
>>
>> This code incidentally also runs in a virtualenv environment AND uses
>> setuptools.  None of these complications can be removed...
> 
> Try putting an "import pdb; pdb.set_trace()" on top of the decimal module.
> Then you can see whenever it gets imported new, and with "bt" get a
> backtrace, and you can inspect (and thus eventually compare) the various
> states of sys.path and sys.modules.


You can also run Python with the "-v" or "-vv" flags to get output
about exactly what files are getting imported from the file
system and when.  "-v" iswhat it got, "-vv" is everywhere it tries.

--Scott David Daniels
Scott.Daniels at Acm.Org


From tjreedy at udel.edu  Fri May  8 14:22:32 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 08 May 2009 14:22:32 -0400
Subject: unicode bit me
In-Reply-To: <0vadnQqkdrdQz5nXnZ2dnUVZ_uOdnZ2d@pdx.net>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<0vadnQqkdrdQz5nXnZ2dnUVZ_uOdnZ2d@pdx.net>
Message-ID: <gu1t96$st$2@ger.gmane.org>

Scott David Daniels wrote:

> <rant>It would be a bit easier if people would bother to mention
> their Python version, as we regularly get questions from people
> running 2.3, 2.4, 2.5, 2.6, 2.7a, 3.0, and 3.1b.  They run computers
> with differing operating systems and versions such as: Windows 2000,
> OS/X Leopard, ubuntu Hardy Heron, SuSE, ....

And if they copy and paste the actual error messages instead of saying 
'It doesn't work'



From tjreedy at udel.edu  Fri May  8 14:25:15 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 08 May 2009 14:25:15 -0400
Subject: import overwrites __name__
In-Reply-To: <gu1pad$afi$1@ger.gmane.org>
References: <gu1pad$afi$1@ger.gmane.org>
Message-ID: <gu1te9$st$3@ger.gmane.org>

Marco wrote:
> Hi,
> 
> There happened something that I do not understand. Actually I don't even 
> know how it can be possible.
> 
> I import a module and then the name space of the importing module seems do 
> be overwritten.
> 
> my_name = __name__
> print my_name
> print len(dir())
> from x import y as z
> print __name__
> print len(dir())
> print my_name
> 
> ->
> __main__
> 119
> x
> 117
> unhandled NameError "name 'my_name' is not defined"
> 
> The module x is from me, and I am not aware of doing anything cruel there. 
> What evil thing can be done in its sub module that can result in that 
> strange thing?

see responses to "unicode bit me' thread



From walterbyrd at iname.com  Fri May  8 15:03:49 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Fri, 8 May 2009 12:03:49 -0700 (PDT)
Subject: Is there a better way to chose a slice of a list?
Message-ID: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>

This works, but it seems like there should be a better way.

--------------
week = ['sun','mon','tue','wed','thu','fri','sat']
for day in week[week.index('tue'):week.index('fri')]:
   print day
---------------



From caseyhHAMMER_TIME at istar.ca  Fri May  8 15:04:01 2009
From: caseyhHAMMER_TIME at istar.ca (Casey Hawthorne)
Date: Fri, 08 May 2009 12:04:01 -0700
Subject: I'm intrigued that Python has some functional constructions in the
	language.
Message-ID: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>

I'm intrigued that Python has some functional constructions in the
language.

Would it be possible to more clearly separate the pure code (without
side effects) from the impure code (that deals with state changes,
I/O, etc.), so that the pure code could be compiled and have
aggressive functional transformations applied to it for efficiency.

That way, the syntax would be a lot easier to understand, than most
functional languages, like Haskell.

I gave a presentation at the beginning of last year on Haskell and at
the end, someone's comment was, "I can see the benefits of functional
programming but why does it have to be so cryptic."
--
Regards,
Casey


From jcd at sdf.lonestar.org  Fri May  8 15:04:55 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 08 May 2009 15:04:55 -0400
Subject: unicode bit me
In-Reply-To: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
Message-ID: <1241809495.6209.13.camel@aalcdl07>

On Fri, 2009-05-08 at 07:53 -0700, anuraguniyal at yahoo.com wrote:
> #how can I print a list of object which may return unicode
> representation?
> # -*- coding: utf-8 -*-
> 
> class A(object):
> 
>     def __unicode__(self):
>         return u"?au"
> 
>     __str__ = __repr__ = __unicode__
> 

Your __str__ and __repr__ methods don't return strings.  You should
encode your unicode to the encoding you want before you try to print it.

class A(object):
    def __unicode__(self):
        return u"?au"

    def get_utf8_repr(self):
        return self.__unicode__().encode('utf-8')

    def get_koi8_repr(self):
        return self.__unicode__().encode('koi-8')

    __str__ = __repr__ = self.get_utf8_repr

> a = A()
> 
> try:
>     print a # doesn't work?
> except UnicodeEncodeError,e:
>     print e
> try:
>     print unicode(a) # works, ok fine, great
> except UnicodeEncodeError,e:
>     print e
> try:
>     print unicode([a]) # what!!!! doesn't work?
> except UnicodeEncodeError,e:
>     print e
> """
> Now how can I print a list of object which may return unicode
> representation?
> loop/map is not an option as it goes much deepr in my real code
> any can anyoen explain what is happening here under the hood?
> """
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From debatem1 at gmail.com  Fri May  8 16:01:26 2009
From: debatem1 at gmail.com (CTO)
Date: Fri, 8 May 2009 13:01:26 -0700 (PDT)
Subject: ECG segmentation
References: <mailman.5305.1241805860.11746.python-list@python.org>
Message-ID: <d8365efd-f154-4676-85d5-1345663c9601@r13g2000vbr.googlegroups.com>

On May 8, 2:04?pm, Filip Gruszczy?ski <grusz... at gmail.com> wrote:
> Hi!
>
> I need to create a script, that performs ECG segmentation, but I can
> hardly find any useful materials on the web. Did anyone try to do this
> and could point me to some good materials/snippets about this?
>
> --
> Filip Gruszczy?ski

How are you looking to do it? If you want an HMM-based solution I'd
recommend <URL: http://ghmm.sourceforge.net/ghmm-python-tutorial.html>.

Geremy Condra


From jcd at sdf.lonestar.org  Fri May  8 16:03:13 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 08 May 2009 16:03:13 -0400
Subject: php to python code converter
In-Reply-To: <4A044D71.1000500@gmail.com>
References: <4A044D71.1000500@gmail.com>
Message-ID: <1241812993.9340.3.camel@aalcdl07>

On Fri, 2009-05-08 at 17:19 +0200, Pascal Chambon wrote:
> PS : Am I the only one having most of answers rejected by the
> antispam 
> system of python-list ? That's humiliating :p
> 

I've had several messages not make it through.

:(




From pruebauno at latinmail.com  Fri May  8 16:22:14 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Fri, 8 May 2009 13:22:14 -0700 (PDT)
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
Message-ID: <51c104f3-4e22-4e3d-a89d-a8133186f3e5@h23g2000vbc.googlegroups.com>

On May 8, 3:03?pm, walterbyrd <walterb... at iname.com> wrote:
> This works, but it seems like there should be a better way.
>
> --------------
> week = ['sun','mon','tue','wed','thu','fri','sat']
> for day in week[week.index('tue'):week.index('fri')]:
> ? ?print day
> ---------------

Depending on the context this style might help:

>>> week = ['sun','mon','tue','wed','thu','fri','sat']
>>> tue_fri = slice(week.index('tue'), week.index('fri'))
>>> for day in week[tue_fri]:
	print day

But I don't really see it as an improvement unless you are using those
intervals repeatedly.


From pruebauno at latinmail.com  Fri May  8 16:28:44 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Fri, 8 May 2009 13:28:44 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
Message-ID: <17b230fc-71e2-4a38-8136-e5aa984aff81@o14g2000vbo.googlegroups.com>

On May 8, 3:04?pm, Casey Hawthorne <caseyhHAMMER_T... at istar.ca> wrote:
> I'm intrigued that Python has some functional constructions in the
> language.
>
> Would it be possible to more clearly separate the pure code (without
> side effects) from the impure code (that deals with state changes,
> I/O, etc.), so that the pure code could be compiled and have
> aggressive functional transformations applied to it for efficiency.
>
> That way, the syntax would be a lot easier to understand, than most
> functional languages, like Haskell.
>
> I gave a presentation at the beginning of last year on Haskell and at
> the end, someone's comment was, "I can see the benefits of functional
> programming but why does it have to be so cryptic."
> --
> Regards,
> Casey

Don't forget that the Python interpreter is simple. It makes
maintenance easier and allows embedding it into other programs. Good
optimizing compilers for functional languages are not simple. Your
idea would be something that could be added to the PyPy project in the
future.


From pavlovevidence at gmail.com  Fri May  8 16:34:03 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 8 May 2009 13:34:03 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
Message-ID: <44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>

On May 8, 12:04?pm, Casey Hawthorne <caseyhHAMMER_T... at istar.ca>
wrote:
> I'm intrigued that Python has some functional constructions in the
> language.
>
> Would it be possible to more clearly separate the pure code (without
> side effects) from the impure code (that deals with state changes,
> I/O, etc.), so that the pure code could be compiled and have
> aggressive functional transformations applied to it for efficiency.

No not really, at least not in any way that it maintains compatibility
with Python.

Python does either expose or mimic the parsing process to the user, so
you could maybe exploit it to get parse trees of functions (checking
that there is nothing that has side-effects) to feed to a specialized
optimizer, but if you do that it might as well be a new langauge.


> That way, the syntax would be a lot easier to understand, than most
> functional languages, like Haskell.
>
> I gave a presentation at the beginning of last year on Haskell and at
> the end, someone's comment was, "I can see the benefits of functional
> programming but why does it have to be so cryptic."

A couple thoughts:

1. It's just one person's opinion.
2. However, functional programming is cryptic at some level no matter
how nice you make the syntax.


Carl Banks


From marco.mandl at gmx.at  Fri May  8 16:35:26 2009
From: marco.mandl at gmx.at (Marco)
Date: Fri, 08 May 2009 22:35:26 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org> <gu1te9$st$3@ger.gmane.org>
Message-ID: <gu252e$rjl$1@ger.gmane.org>

Terry Reedy wrote:

> Marco wrote:
>> Hi,
>> 
>> There happened something that I do not understand. Actually I don't even
>> know how it can be possible.
>> 
>> I import a module and then the name space of the importing module seems
>> do be overwritten.
>> 
>> my_name = __name__
>> print my_name
>> print len(dir())
>> from x import y as z
>> print __name__
>> print len(dir())
>> print my_name
>> 
>> ->
>> __main__
>> 119
>> x
>> 117
>> unhandled NameError "name 'my_name' is not defined"
>> 
>> The module x is from me, and I am not aware of doing anything cruel
>> there. What evil thing can be done in its sub module that can result in
>> that strange thing?
> 
> see responses to "unicode bit me' thread

Therry,

What shall I find there?





From ericgparker at gmail.com  Fri May  8 16:45:11 2009
From: ericgparker at gmail.com (hellcats)
Date: Fri, 8 May 2009 13:45:11 -0700 (PDT)
Subject: Complete frustration
Message-ID: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>

I have Python2.5 installed on Windows XP. Whenever I double click on a
something.pyw file, IDLE launches and opens something.pyw in the
editor. I would prefer to actually *RUN* the program, not edit it. If
I want to edit it then I'll choose the "Edit with IDLE" context menu.
So I then have to press F5 to get the program to execute. Now I have
my program's windows along with two IDLE windows cluttering my screen
and task bar. WHAT IS GOING ON? I've tried changing the file
association to python.exe, and that works, but just ONCE (even if I
choose "always use the slected program to launch this kind of file").
IDLE may be great and all, but I fricken' don't want to see it every
time I just want to run a python program!!!!!


From namekuseijin at gmail.com  Fri May  8 16:52:48 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 08 May 2009 17:52:48 -0300
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <17b230fc-71e2-4a38-8136-e5aa984aff81@o14g2000vbo.googlegroups.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<17b230fc-71e2-4a38-8136-e5aa984aff81@o14g2000vbo.googlegroups.com>
Message-ID: <gu2633$163q$1@adenine.netfront.net>

pruebauno at latinmail.com escreveu:
> Don't forget that the Python interpreter is simple. It makes
> maintenance easier and allows embedding it into other programs. Good
> optimizing compilers for functional languages are not simple.

Good optimizing compilers are not simple, period.

The python interpreter is not all that simple either.  Have you ever 
taken a look at it?  It's a good bytecode interpreter, not some dumb toy 
interpreter.

-- 
a game sig: http://tinyurl.com/d3rxz9


From namekuseijin at gmail.com  Fri May  8 16:56:17 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 08 May 2009 17:56:17 -0300
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
Message-ID: <gu269i$16if$1@adenine.netfront.net>

Carl Banks escreveu:
> 2. However, functional programming is cryptic at some level no matter
> how nice you make the syntax.

When your program is nothing but function definition and function 
application, syntax is meaningless.

It's kinda like scripting, say, Microsoft Word in either Visual Basic, 
Python, Haskell or whatever:  you're just calling functions provided by 
the host, barely using any syntax or intrinsic language feature anyway. 
  Any language will do just fine.

-- 
a game sig: http://tinyurl.com/d3rxz9


From jeff_barish at earthlink.net  Fri May  8 17:06:02 2009
From: jeff_barish at earthlink.net (Jeffrey Barish)
Date: Fri, 08 May 2009 15:06:02 -0600
Subject: Threads and daemon processes
Message-ID: <gu26rr$23s$1@ger.gmane.org>

I have a program that uses threading.Timer to execute a function after a
delay.  It works fine when I run the program normally, but when I run the
program as a daemon process, I can't find any evidence that the function
ever runs.  Is it the case that daemon processes are not allowed to create
a thread?
-- 
Jeffrey Barish



From google at mrabarnett.plus.com  Fri May  8 17:06:48 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 08 May 2009 22:06:48 +0100
Subject: php to python code converter
In-Reply-To: <1241812993.9340.3.camel@aalcdl07>
References: <4A044D71.1000500@gmail.com> <1241812993.9340.3.camel@aalcdl07>
Message-ID: <4A049EE8.3020003@mrabarnett.plus.com>

J. Cliff Dyer wrote:
> On Fri, 2009-05-08 at 17:19 +0200, Pascal Chambon wrote:
>> PS : Am I the only one having most of answers rejected by the
>> antispam 
>> system of python-list ? That's humiliating :p
>>
> 
> I've had several messages not make it through.
> 
> :(
> 
Same here ("Message has a suspicious header").


From marco.mandl at gmx.at  Fri May  8 17:15:00 2009
From: marco.mandl at gmx.at (Marco)
Date: Fri, 08 May 2009 23:15 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org>
Message-ID: <gu27cl$3kg$1@ger.gmane.org>

Marco wrote:

> Hi,
> 
> There happened something that I do not understand. Actually I don't even
> know how it can be possible.
> 
> I import a module and then the name space of the importing module seems do
> be overwritten.
> 
> my_name = __name__
> print my_name
> print len(dir())
> from x import y as z
> print __name__
> print len(dir())
> print my_name
> 
> ->
> __main__
> 119
> x
> 117
> unhandled NameError "name 'my_name' is not defined"
> 
> The module x is from me, and I am not aware of doing anything cruel there.
> What evil thing can be done in its sub module that can result in that
> strange thing?


I just discovered the .pyc file for the main module is not created. When I 
delete the old pyc and import the main module from the python shell it works 
fine. But when I start it with "python main_module.py" the .pyc is not 
created and it happens as shown above.

So what leads to the behavior that the .pyc is not created?

br
Marco




From emile at fenx.com  Fri May  8 17:18:44 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 08 May 2009 14:18:44 -0700
Subject: Complete frustration
In-Reply-To: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
Message-ID: <gu27g2$2o7$1@ger.gmane.org>

On 5/8/2009 1:45 PM hellcats said...
> I have Python2.5 installed on Windows XP. Whenever I double click on a
> something.pyw file, IDLE launches and opens something.pyw in the
> editor. I would prefer to actually *RUN* the program, not edit it. If
> I want to edit it then I'll choose the "Edit with IDLE" context menu.
> So I then have to press F5 to get the program to execute. Now I have
> my program's windows along with two IDLE windows cluttering my screen
> and task bar. WHAT IS GOING ON? I've tried changing the file
> association to python.exe, and that works, but just ONCE (even if I
> choose "always use the slected program to launch this kind of file").
> IDLE may be great and all, but I fricken' don't want to see it every
> time I just want to run a python program!!!!!
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
This is a windows question -- you'll need to reassign the default 
association of PYW files.  Look in explorer|tools|folder options.

Emile



From piet at cs.uu.nl  Fri May  8 17:22:26 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 08 May 2009 23:22:26 +0200
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
Message-ID: <m2eiuzi92l.fsf@cs.uu.nl>

>>>>> "J. Cliff Dyer" <jcd at sdf.lonestar.org> (JCD) a ?crit:

>JCD> On Fri, 2009-05-08 at 07:53 -0700, anuraguniyal at yahoo.com wrote:
>>> #how can I print a list of object which may return unicode
>>> representation?
>>> # -*- coding: utf-8 -*-
>>> 
>>> class A(object):
>>> 
>>> def __unicode__(self):
>>> return u"?au"
>>> 
>>> __str__ = __repr__ = __unicode__
>>> 

>JCD> Your __str__ and __repr__ methods don't return strings.  You should
>JCD> encode your unicode to the encoding you want before you try to print it.

>JCD> class A(object):
>JCD>     def __unicode__(self):
>JCD>         return u"?au"

>JCD>     def get_utf8_repr(self):
>JCD>         return self.__unicode__().encode('utf-8')

>JCD>     def get_koi8_repr(self):
>JCD>         return self.__unicode__().encode('koi-8')

>JCD>     __str__ = __repr__ = self.get_utf8_repr

It might be nicer to have a method that specifies the encoding to be
used in order to make switching encodings easier:

*untested code*

class A(object):
    def __unicode__(self):
        return u"?au"

    def set_encoding(self, encoding):
        self._encoding = encoding

    def __repr__(self):
        return self.__unicode__().encode(self._encoding)

    __str__ = __repr__

Of course this feels very wrong because the encoding should be chosen when
the string goes to the output channel, i.e. outside of the object.
Unfortunately this is one of the leftovers from Python's pre-unicode
heritage. Hopefully in Python3 this will work without problems. Anyway,
in Python 3 the string type is unicode, so at least __repr__ can return
unicode. 
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From apt.shansen at gmail.com  Fri May  8 17:25:45 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 8 May 2009 14:25:45 -0700
Subject: import overwrites __name__
In-Reply-To: <gu27cl$3kg$1@ger.gmane.org>
References: <gu1pad$afi$1@ger.gmane.org> <gu27cl$3kg$1@ger.gmane.org>
Message-ID: <7a9c25c20905081425n15a34acetf25cb6f2e7cbdad6@mail.gmail.com>

>
>  So what leads to the behavior that the .pyc is not created?
>

PYC's are only generated on import, they're never made for the main script.

I personally like to keep my 'main script' very small. Largely just
something which imports other modules and sends them along on their
business.

--S
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From marco.mandl at gmx.at  Fri May  8 17:37:25 2009
From: marco.mandl at gmx.at (Marco)
Date: Fri, 08 May 2009 23:37:25 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org> <gu27cl$3kg$1@ger.gmane.org>
	<7a9c25c20905081425n15a34acetf25cb6f2e7cbdad6@mail.gmail.com>
Message-ID: <gu28ml$6j7$1@ger.gmane.org>

Stephen Hansen wrote:

>>
>>  So what leads to the behavior that the .pyc is not created?
>>
> 
> PYC's are only generated on import, they're never made for the main
> script.
> 
> I personally like to keep my 'main script' very small. Largely just
> something which imports other modules and sends them along on their
> business.

Thanks Stephen,

I just learned that. But still I don't know why there is a different 
(correct) behavior when the main module is compiled.

As a work-around I put this on top of my main script:

import py_compile
py_compile.compile(__file__)

Still I appreciate if someone could explain me why.

br
Marco 




From ldo at geek-central.gen.new_zealand  Fri May  8 17:48:58 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 09 May 2009 09:48:58 +1200
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
Message-ID: <gu29cb$8gg$1@lust.ihug.co.nz>

In message <gu269i$16if$1 at adenine.netfront.net>, namekuseijin wrote:

> Carl Banks escreveu:
>
>> 2. However, functional programming is cryptic at some level no matter
>> how nice you make the syntax.
> 
> When your program is nothing but function definition and function
> application, syntax is meaningless.

On the contrary, syntax is vital to the correct interpretation of functional constructs. See, for example, 
<http://mail.python.org/pipermail/python-list/2008-October/683816.html>.



From apt.shansen at gmail.com  Fri May  8 18:08:03 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 8 May 2009 15:08:03 -0700
Subject: import overwrites __name__
In-Reply-To: <gu28ml$6j7$1@ger.gmane.org>
References: <gu1pad$afi$1@ger.gmane.org> <gu27cl$3kg$1@ger.gmane.org> 
	<7a9c25c20905081425n15a34acetf25cb6f2e7cbdad6@mail.gmail.com> 
	<gu28ml$6j7$1@ger.gmane.org>
Message-ID: <7a9c25c20905081508rdf944c6mf7eb15592ea4ec24@mail.gmail.com>

>
>
> Still I appreciate if someone could explain me why.
>

We can't without seeing the code. There shouldn't be any difference, so if
there is then its because your code is doing something to cause it-- break
it down to a runnable example and we may be able to tell you why, giving us
real code and real errors / output. When you distill it into a pseudocode
explanation of what you're doing and ask why it doesn't work, quite often
what you end up doing is unintentionally leaving out the cause.

E.g., I made two files;

main.py
    my_name = __name__
    print my_name
    print len(dir())
    from other import y as z
    print __name__
    print len(dir())
    print my_name
other.py:
    y = True

And the output is -- no matter if there's a pyc or not -- always:
    __main__
    5
    __main__
    6
    __main__

There's nothing in default/standard Python which is causing this behavior--
Python doesn't run code differently based on if there's a pyc or not or if
its generating a pyc or not, not by itself. You have to be doing something
which is goofying up the interpreter somewhere. Not sure what, but it has to
be in that 'x' you're importing from :)

--S
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From ericgparker at gmail.com  Fri May  8 18:08:16 2009
From: ericgparker at gmail.com (hellcats)
Date: Fri, 8 May 2009 15:08:16 -0700 (PDT)
Subject: Complete frustration
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
	<mailman.5316.1241817430.11746.python-list@python.org>
Message-ID: <0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>

On May 8, 4:18?pm, Emile van Sebille <em... at fenx.com> wrote:
> On 5/8/2009 1:45 PM hellcats said...> I have Python2.5 installed on Windows XP. Whenever I double click on a
> > something.pyw file, IDLE launches and opens something.pyw in the
> > editor. I would prefer to actually *RUN* the program, not edit it. If
> > I want to edit it then I'll choose the "Edit with IDLE" context menu.
> > So I then have to press F5 to get the program to execute. Now I have
> > my program's windows along with two IDLE windows cluttering my screen
> > and task bar. WHAT IS GOING ON? I've tried changing the file
> > association to python.exe, and that works, but just ONCE (even if I
> > choose "always use the slected program to launch this kind of file").
> > IDLE may be great and all, but I fricken' don't want to see it every
> > time I just want to run a python program!!!!!
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> This is a windows question -- you'll need to reassign the default
> association of PYW files. ?Look in explorer|tools|folder options.
>
> Emile

I know that. I've tried reassigning it from pythonw.exe to python.exe,
and like I said, it will work for one invocation. But it seems to
revert back the next time I double click. But also, what is wrong with
it being pythonw.exe? Why does pythonw.exe open up IDLE?


From pavlovevidence at gmail.com  Fri May  8 18:22:04 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 8 May 2009 15:22:04 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
Message-ID: <cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>

On May 8, 1:56?pm, namekuseijin <namekusei... at gmail.com> wrote:
> Carl Banks escreveu:
>
> > 2. However, functional programming is cryptic at some level no matter
> > how nice you make the syntax.
>
> When your program is nothing but function definition and function
> application, syntax is meaningless.

For mere function application you could maybe argue that (and it'd be
a stretch), but there is no reasonable way to claim that syntax is
meaningless for defining functions.  Unless you meant "function
declaration", and I think you did because you don't seem to know what
functional programming is.

> It's kinda like scripting, say, Microsoft Word in either Visual Basic,
> Python, Haskell or whatever:

No it's nothing like that at all.

> ?you're just calling functions provided by
> the host,

That's not what functional programming means, nor is it remotely
comparable to functional programming.

> barely using any syntax or intrinsic language feature anyway.
> ? Any language will do just fine.

Well, that's not true since I found it to be quite a different
experience to invoke Microsoft library functions  in JScript than in
Visual Basic.  (Mostly because it's a PITA even to "barely use any
syntax or intrinsic language feature" of Visual Basic.)

However, that has nothing to do with functional programming.


Carl Banks


From usenet at janc.invalid  Fri May  8 18:24:54 2009
From: usenet at janc.invalid (JanC)
Date: Fri, 8 May 2009 22:24:54 +0000 (UTC)
Subject: Is it better to use threads or fork in the following case
References: <4e76cd62-e0ba-41dc-8259-103b42730e56@x31g2000prc.googlegroups.com>
	<766cdhF1bk2ipU1@mid.uni-berlin.de>
	<5212a09e-37be-4e5f-b040-515913ccf2e8@p6g2000pre.googlegroups.com>
	<bea7d12e-2bda-4ec6-868b-440b79bd28e4@21g2000vbk.googlegroups.com>
	<mailman.5014.1241386734.11746.python-list@python.org>
Message-ID: <gu2bfm$jgu$1@news.motzarella.org>

Gabriel Genellina wrote:

> In addition, the zip file format stores the directory at the end of the  
> file. So you can't process it until it's completely downloaded.  

Well, you *can* download the directory part first (if the HTTP server
supports it), and if you only need some files, you could then only
download these files out of the .zip, saving a lot in download time...


-- 
JanC



From emile at fenx.com  Fri May  8 18:36:17 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 08 May 2009 15:36:17 -0700
Subject: Complete frustration
In-Reply-To: <0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>	<mailman.5316.1241817430.11746.python-list@python.org>
	<0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>
Message-ID: <gu2c1h$f0j$1@ger.gmane.org>

On 5/8/2009 3:08 PM hellcats said...
> On May 8, 4:18 pm, Emile van Sebille <em... at fenx.com> wrote:
<snip>
>> This is a windows question -- you'll need to reassign the default
>> association of PYW files.  Look in explorer|tools|folder options.
>>
>> Emile
> 
> I know that. I've tried reassigning it from pythonw.exe to python.exe,
> and like I said, it will work for one invocation. But it seems to
> revert back the next time I double click. But also, what is wrong with
> it being pythonw.exe? Why does pythonw.exe open up IDLE?

When you right click your source file, do you have an 'open with' python 
option?  Does that do the right thing?  If so, you're fighting your 
windows installation which is where you'll need to address this problem.

You might try downloading and installing the activestate python 
distribution (assuming you're not already there).  That will likely set 
your windows registry appropriately.

Emile



From Scott.Daniels at Acm.Org  Fri May  8 18:37:09 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 15:37:09 -0700
Subject: Complete frustration
In-Reply-To: <0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
	<mailman.5316.1241817430.11746.python-list@python.org>
	<0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>
Message-ID: <RcmdnbInS6h5L5nXnZ2dnUVZ_h-dnZ2d@pdx.net>

hellcats wrote:
> On May 8, 4:18 pm, Emile van Sebille <em... at fenx.com> wrote:
>> On 5/8/2009 1:45 PM hellcats said...> I have Python2.5 installed on Windows XP. Whenever I double click on a
>>> something.pyw file, IDLE launches and opens something.pyw in the
>>> editor. I would prefer to actually *RUN* the program, not edit it. If
>>> I want to edit it then I'll choose the "Edit with IDLE" context menu.
>>> So I then have to press F5 to get the program to execute. Now I have
>>> my program's windows along with two IDLE windows cluttering my screen
>>> and task bar. WHAT IS GOING ON? I've tried changing the file
>>> association to python.exe, and that works, but just ONCE (even if I
>>> choose "always use the slected program to launch this kind of file").
>>> IDLE may be great and all, but I fricken' don't want to see it every
>>> time I just want to run a python program!!!!!
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>> This is a windows question -- you'll need to reassign the default
>> association of PYW files.  Look in explorer|tools|folder options.
>>
>> Emile
> 
> I know that. I've tried reassigning it from pythonw.exe to python.exe,
> and like I said, it will work for one invocation. But it seems to
> revert back the next time I double click. But also, what is wrong with
> it being pythonw.exe? Why does pythonw.exe open up IDLE?

Try opening up a command window, and determine the current associations.
If I do this on mine:
     C:\Projects> assoc .pyw
     .pyw=Python.NoConFile

     C:\Projects> ftype Python.NoConFile
     Python.NoConFile="C:\Python31\pythonw.exe" "%1" %*

It is possible you installed something that switched those settings.

--Scott David Daniels
Scott.Daniels at Acm.Org


From caseyhHAMMER_TIME at istar.ca  Fri May  8 18:59:28 2009
From: caseyhHAMMER_TIME at istar.ca (Casey Hawthorne)
Date: Fri, 08 May 2009 15:59:28 -0700
Subject: Complete frustration
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
	<mailman.5316.1241817430.11746.python-list@python.org>
Message-ID: <99e905to9s933pa6lpap31mn4mmdgks763@4ax.com>

On Fri, 08 May 2009 14:18:44 -0700, Emile van Sebille <emile at fenx.com>
wrote:

>On 5/8/2009 1:45 PM hellcats said...
>> I have Python2.5 installed on Windows XP. Whenever I double click on a
>> something.pyw file, IDLE launches and opens something.pyw in the
>> editor. I would prefer to actually *RUN* the program, not edit it. If
>> I want to edit it then I'll choose the "Edit with IDLE" context menu.
>> So I then have to press F5 to get the program to execute. Now I have
>> my program's windows along with two IDLE windows cluttering my screen
>> and task bar. WHAT IS GOING ON? I've tried changing the file
>> association to python.exe, and that works, but just ONCE (even if I
>> choose "always use the slected program to launch this kind of file").
>> IDLE may be great and all, but I fricken' don't want to see it every
>> time I just want to run a python program!!!!!
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>> 
>This is a windows question -- you'll need to reassign the default 
>association of PYW files.  Look in explorer|tools|folder options.
>
>Emile

I believe this option is in the Python init file!
--
Regards,
Casey


From zondo42 at googlemail.com  Fri May  8 19:16:35 2009
From: zondo42 at googlemail.com (Glenn Hutchings)
Date: Sat, 09 May 2009 00:16:35 +0100
Subject: import overwrites __name__
References: <mailman.5301.1241803210.11746.python-list@python.org>
Message-ID: <pan.2009.05.08.23.16.34.990609@googlemail.com>

On Fri, 08 May 2009 19:14:52 +0200, Marco wrote:

> I import a module and then the name space of the importing module seems do 
> be overwritten.
> 
> my_name = __name__
> print my_name
> print len(dir())
> from x import y as z
> print __name__
> print len(dir())
> print my_name
> 
> ->
> __main__
> 119
> x
> 117
> unhandled NameError "name 'my_name' is not defined"

Interesting.  Here's one possibility for the contents of module x.py:

import sys
del sys.modules['__main__'].my_name
y = 42

I can't think of any other way apart from grovelling through sys.modules.

Glenn


From ericgparker at gmail.com  Fri May  8 19:20:52 2009
From: ericgparker at gmail.com (hellcats)
Date: Fri, 8 May 2009 16:20:52 -0700 (PDT)
Subject: Complete frustration
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
	<mailman.5316.1241817430.11746.python-list@python.org>
	<0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>
	<mailman.5320.1241822076.11746.python-list@python.org>
Message-ID: <83ebb5c0-4381-4905-a245-a18ce1c6c33a@s16g2000vbp.googlegroups.com>

On May 8, 5:36?pm, Emile van Sebille <em... at fenx.com> wrote:
> On 5/8/2009 3:08 PM hellcats said...
>
> > On May 8, 4:18 pm, Emile van Sebille <em... at fenx.com> wrote:
> <snip>
> >> This is a windows question -- you'll need to reassign the default
> >> association of PYW files. ?Look in explorer|tools|folder options.
>
> >> Emile
>
> > I know that. I've tried reassigning it from pythonw.exe to python.exe,
> > and like I said, it will work for one invocation. But it seems to
> > revert back the next time I double click. But also, what is wrong with
> > it being pythonw.exe? Why does pythonw.exe open up IDLE?
>
> When you right click your source file, do you have an 'open with' python
> option? ?Does that do the right thing? ?If so, you're fighting your
> windows installation which is where you'll need to address this problem.
>
> You might try downloading and installing the activestate python
> distribution (assuming you're not already there). ?That will likely set
> your windows registry appropriately.
>
> Emile

Thanks everyone for the suggestions. I played with the registry a
little bit. It looks like I had Python2.6 installed at one point, so
maybe that corrupted things. I uninstalled everything and reinstalled
Python2.5 (but without Tk/Tcl) and now double clicking a .pyw runs the
program without IDLE or the MSDOS window showing up (as I had hoped).
So I am happy now. Thanks again.


From denis.papathanasiou at gmail.com  Fri May  8 19:36:06 2009
From: denis.papathanasiou at gmail.com (dpapathanasiou)
Date: Fri, 8 May 2009 16:36:06 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
Message-ID: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>

I wrote a python script called xml_utils.py which parses xml using
minidom.

It works when it's run on its own, but when I try to import it and run
it inside a mod_python handler, I get this error:

  File "../common/xml_utils.py", line 80, in parse_item_attribute
  File "/usr/lib/python2.5/xml/dom/minidom.py", line 1924, in
parseString
    from xml.dom import expatbuilder
SystemError: Parent module 'xml.dom' not loaded

Basically, it's the same problem I found in this post:
http://mail.python.org/pipermail/python-list/2007-January/424018.html

This site (http://www.dscpl.com.au/wiki/ModPython/Articles/
ExpatCausingApacheCrash) goes through a detailed explanation, and I
found that the version of pyexpat is newer than libexpat:

# ldd /usr/local/apache2/bin/httpd | grep expat
	libexpat.so.0 => /usr/local/apache2/lib/libexpat.so.0 (0xb7f71000)
# strings /usr/local/apache2/lib/libexpat.so.0 | grep expat_
expat_1.95.2

$ python
Python 2.5.2 (r252:60911, Jan  4 2009, 17:40:26)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyexpat
>>> pyexpat.version_info
(2, 0, 0)

But this is where I'm stuck: the article suggests recompiling apache
with the newer version of expat.

Apache's configure utility (I'm using httpd version 2.2.11) doesn't
explicitly describe an expat library option.

Also, if libexpat is version 1.95.2, wouldn't I have to get version
2.0 to be compatible with pyexpat?

If anyone has any advice or suggestions, I'd appreciate hearing them.


From gallium.arsenide at gmail.com  Fri May  8 19:55:39 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Fri, 8 May 2009 16:55:39 -0700 (PDT)
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
Message-ID: <6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>

On May 8, 3:03?pm, walterbyrd <walterb... at iname.com> wrote:
> This works, but it seems like there should be a better way.
>
> --------------
> week = ['sun','mon','tue','wed','thu','fri','sat']
> for day in week[week.index('tue'):week.index('fri')]:
> ? ?print day
> ---------------

I think you should provide much more information, primarily why you
want to do this.  What is the larger goal you are trying to achieve?

In the absence of further information, it seems to me that you are
trying to create an enumerated type.  For various ideas to achieve
this simply, depending on your purpose, see

  http://norvig.com/python-iaq.html

If you want a more thorough treatment, maybe try this package:

  http://pypi.python.org/pypi/enum/

There may be other recipes and packages; you can Google for them using
keywords "python enum" or similar.

John


From emile at fenx.com  Fri May  8 20:03:34 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 08 May 2009 17:03:34 -0700
Subject: Complete frustration
In-Reply-To: <99e905to9s933pa6lpap31mn4mmdgks763@4ax.com>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>	<mailman.5316.1241817430.11746.python-list@python.org>
	<99e905to9s933pa6lpap31mn4mmdgks763@4ax.com>
Message-ID: <gu2h55$p68$1@ger.gmane.org>

On 5/8/2009 3:59 PM Casey Hawthorne said...
> On Fri, 08 May 2009 14:18:44 -0700, Emile van Sebille <emile at fenx.com>
<snip>
>> This is a windows question -- you'll need to reassign the default 
>> association of PYW files.  Look in explorer|tools|folder options.
>>
>> Emile
> 
> I believe this option is in the Python init file!

As in part of site?  Such that invoking "python.exe myfile.py" turns it 
around and invokes idle myfile.py?

Who knew?  :)

Emile



From namekuseijin at gmail.com  Fri May  8 20:16:35 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 8 May 2009 17:16:35 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net> <gu29cb$8gg$1@lust.ihug.co.nz>
Message-ID: <692b7ae8-0c5b-498a-a012-51bda980f3b9@s28g2000vbp.googlegroups.com>

On May 8, 6:48?pm, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <gu269i$16i... at adenine.netfront.net>, namekuseijin wrote:
>
> > Carl Banks escreveu:
>
> >> 2. However, functional programming is cryptic at some level no matter
> >> how nice you make the syntax.
>
> > When your program is nothing but function definition and function
> > application, syntax is meaningless.
>
> On the contrary, syntax is vital to the correct interpretation of functional constructs. See, for example,
> <http://mail.python.org/pipermail/python-list/2008-October/683816.html>.

Yeah, it's important in an imperative language to have predefined
syntax to allow you to do things.  Point taken.


From steve at REMOVE-THIS-cybersource.com.au  Fri May  8 20:28:34 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 00:28:34 GMT
Subject: Newcomer to Python tutorial question
References: <hRFMl.50224$tb.4955@newsfe07.ams2>
	<mailman.5234.1241721664.11746.python-list@python.org>
Message-ID: <0214c170$0$20647$c3e8da3@news.astraweb.com>

On Thu, 07 May 2009 11:40:57 -0700, Chris Rebert wrote:

>> why is the printed result of
>>
>>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>>> print(basket)
>> {'orange', 'banana', 'pear', 'apple'}
>>
>> in the sequence given?
> 
> Because it's *not a sequence* at all, it's a set. 

[pedant]

But the *printed output* is a sequence. It's a sequence of characters. 
The OP doesn't claim that basket is a sequence-type, he is using 
"sequence" in a generic, plain English way.

[/pedant]

I agree with the rest of your explanation about arbitrary ordering of 
sets :)



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Fri May  8 20:30:40 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 08 May 2009 21:30:40 -0300
Subject: Threads and daemon processes
References: <gu26rr$23s$1@ger.gmane.org>
Message-ID: <op.utmzpei1x6zn5v@lepton.softlabbsas.com.ar>

En Fri, 08 May 2009 18:06:02 -0300, Jeffrey Barish  
<jeff_barish at earthlink.net> escribi?:

> I have a program that uses threading.Timer to execute a function after a
> delay.  It works fine when I run the program normally, but when I run the
> program as a daemon process, I can't find any evidence that the function
> ever runs.  Is it the case that daemon processes are not allowed to  
> create a thread?

Try redirecting stdout/stderr to some log file; maybe your daemon dies due  
to some error.

-- 
Gabriel Genellina



From socyl at 987jk.com.invalid  Fri May  8 20:35:03 2009
From: socyl at 987jk.com.invalid (kj)
Date: Sat, 9 May 2009 00:35:03 +0000 (UTC)
Subject: ISO exemplary Python scripts
Message-ID: <gu2j3n$a90$1@reader1.panix.com>



I'm learning python, for the umpteenth time.  This time I decided
to start out by writing Python scripts for everyday tasks.  Most
of these scripts are meant to be used only once or twice, but a
few of them have become useful enough that I'd like to make them
a little bit more solid...

I'd like to learn from well-written Python scripts, with well-structured
options parsing, good error and help messages, clear organization,
etc.

Can someone point me to good examples of Python scripts?

TIA!

kynnjo

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From Scott.Daniels at Acm.Org  Fri May  8 20:35:34 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 17:35:34 -0700
Subject: import overwrites __name__
In-Reply-To: <pan.2009.05.08.23.16.34.990609@googlemail.com>
References: <mailman.5301.1241803210.11746.python-list@python.org>
	<pan.2009.05.08.23.16.34.990609@googlemail.com>
Message-ID: <YI2dnX1yock-U5nXnZ2dnUVZ_rOdnZ2d@pdx.net>

Glenn Hutchings wrote:
> On Fri, 08 May 2009 19:14:52 +0200, Marco wrote:
> 
>> I import a module and then the name space of the importing module seems do 
>> be overwritten.
>>
>> my_name = __name__
>> print my_name
>> print len(dir())
>> from x import y as z
>> print __name__
>> print len(dir())
>> print my_name
>>
>> ->
>> __main__
>> 119
>> x
>> 117
>> unhandled NameError "name 'my_name' is not defined"
> 
> Interesting.  Here's one possibility for the contents of module x.py:
> 
> import sys
> del sys.modules['__main__'].my_name
> y = 42
> 
> I can't think of any other way apart from grovelling through sys.modules.

OK, here's one way to see more detail:
     import sys
     my_name = __name__
     pre = set(sys.modules), set(dir())
     from x import y as z
     post = set(sys.modules), set(dir())
     print 'Modules added: %s, removed: %s' % (
                post[0] - pre[0], pre[0] - post[0])
     print 'Globals added: %s, removed: %s' % (
                post[1] - pre[1], pre[1] - post[1])

--Scott David Daniels
Scott.Daniels at Acm.Org


From Scott.Daniels at Acm.Org  Fri May  8 20:39:33 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 17:39:33 -0700
Subject: Complete frustration
In-Reply-To: <83ebb5c0-4381-4905-a245-a18ce1c6c33a@s16g2000vbp.googlegroups.com>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
	<mailman.5316.1241817430.11746.python-list@python.org>
	<0e27e21f-a09b-4f33-8795-f96d66b0db24@l5g2000vbc.googlegroups.com>
	<mailman.5320.1241822076.11746.python-list@python.org>
	<83ebb5c0-4381-4905-a245-a18ce1c6c33a@s16g2000vbp.googlegroups.com>
Message-ID: <Hv2dnWJTiOoPUpnXnZ2dnUVZ_vudnZ2d@pdx.net>

hellcats wrote:
> On May 8, 5:36 pm, Emile van Sebille <em... at fenx.com> wrote:
>> On 5/8/2009 3:08 PM hellcats said...
>>
>>> On May 8, 4:18 pm, Emile van Sebille <em... at fenx.com> wrote:
>> <snip>
>>>> This is a windows question -- you'll need to reassign the default
>>>> association of PYW files.  Look in explorer|tools|folder options.
>>>> Emile
>>> I know that. I've tried reassigning it from pythonw.exe to python.exe,
>>> and like I said, it will work for one invocation. But it seems to
>>> revert back the next time I double click. But also, what is wrong with
>>> it being pythonw.exe? Why does pythonw.exe open up IDLE?
>> When you right click your source file, do you have an 'open with' python
>> option?  Does that do the right thing?  If so, you're fighting your
>> windows installation which is where you'll need to address this problem.
>>
>> You might try downloading and installing the activestate python
>> distribution (assuming you're not already there).  That will likely set
>> your windows registry appropriately.
>>
>> Emile
> 
> Thanks everyone for the suggestions. I played with the registry a
> little bit. It looks like I had Python2.6 installed at one point, so
> maybe that corrupted things. I uninstalled everything and reinstalled
> Python2.5 (but without Tk/Tcl) and now double clicking a .pyw runs the
> program without IDLE or the MSDOS window showing up (as I had hoped).
> So I am happy now. Thanks again.

You probably can have Tk/Tcl there, I suspect something like VPython
or the 2.6 and remove it caused the problem.  By the way, it is safe
to simply uninstall-reinstall a python .msi in order to make that
version of python be the default.  uninstalling only removes that
which it installs, so after a reinstall, your other libraries are
still safely there.

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at REMOVE-THIS-cybersource.com.au  Fri May  8 20:39:37 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 00:39:37 GMT
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5109.1241543371.11746.python-list@python.org>
	<85d4am8hq4.fsf@agentultra.com>
	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
	<8563gcx1p1.fsf@agentultra.com>
Message-ID: <0214c407$0$20647$c3e8da3@news.astraweb.com>

On Thu, 07 May 2009 13:28:10 -0400, J Kenneth King wrote:

> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
> 
>> On Wed, 06 May 2009 09:48:51 -0400, J Kenneth King wrote:
>>
>>> Emile van Sebille <emile at fenx.com> writes:
>>> 
>>>> On 5/5/2009 9:15 AM J Kenneth King said...
>>>>
>>>>> List comprehensions can make a reader of your code apprehensive
>>>>> because it can read like a run-on sentence and thus be difficult to
>>>>> parse. The Python documentation discourages their use and I believe
>>>>> for good reason.
>>>>
>>>> Can you provide a link for this?  I'd like to see specifically what's
>>>> being discouraged, as I'd be surprised to find routine usage frowned
>>>> upon.
>>>>
>>>> Emile
>>> 
>>> http://docs.python.org/tutorial/datastructures.html#nested-list-
>> comprehensions
>>> 
>>> 
>>> "If you?ve got the stomach for it, list comprehensions can be nested.
>>> They are a powerful tool but ? like all powerful tools ? they need to
>>> be used carefully, if at all."
>>
>> How does this discourage the use of list comprehensions? At most, it
>> warns that complicated list comps are tricky. Complicated *anything*
>> are tricky.
> 
> They are tricky and need to be used carefully, *if at all*.
> 
> IMO this means that if there's a way to do it without a nested list
> comprehension, then that solution should be preferred.

Earlier, you claimed that list comps in general were discouraged:

"List comprehensions can make a reader of your code apprehensive because 
it can read like a run-on sentence and thus be difficult to parse. The 
Python documentation discourages their use and I believe for good reason."

Emile said "I'd be surprised to find routine usage frowned upon", giving 
you the opportunity to correct his (mis)understanding. You failed to do 
so, which I took as meaning that you agreed that routine usage of simple 
list comps were frowned upon. Now you're talking about *nested* list 
comps. You started off (apparently) objecting to list comps in general, 
because they "can" make readers apprehensive. Now you seem to be saying 
that it's only the complicated, overly-dense ones which rightly make 
readers apprehensive which you object to.

I suppose we're making progress if we agree that the Python docs warn 
against unnecessarily complicated nested list comps. Whether it 
discourages as well as warns is a matter of interpretation. But there's 
certainly no sign that list comps as a general technique are discouraged 
just because overly-complicated list comps are tricky to read. The same 
can be said about *any* piece of code.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May  8 20:41:08 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 00:41:08 GMT
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<f23ebd9d-f445-4ebf-9b87-971d3ab295f6@p4g2000vba.googlegroups.com>
Message-ID: <0214c461$0$20647$c3e8da3@news.astraweb.com>

On Thu, 07 May 2009 08:21:51 -0700, Francis Carr wrote:

> In the special case of a self-recursive function, you would like re-
> naming "to just work".  Out of morbid curiosity, I am compelled to
> ask... why do you expect that re-naming anything --- a function, a
> class, a module, a variable, anything --- in just one place but not all
> the others should ever, under any circumstances, "just work" ?

Patching functions to do pre-processing or post-processing can be a 
useful technique, (e.g. for tracing and debugging). This works for 
regular functions, but not recursive functions.


>>> def listify(x):
...     return [x]
...
>>> listify(42)
[42]
>>>
>>> _old_listify = listify
>>> def listify(x):
...     print "Calling listify"
...     return _old_listify(x)
...
>>> listify(42)
Calling listify
[42]

Note that the call to listify "just works" -- the patch runs once, the 
original version of the function runs once, and we get the expected 
results without any problems.


Now try the same technique on a recursive function, and it fails:

>>> def rec(x):
...     if x > 0: return [x] + rec(x-1)
...     else: return []
...
>>> rec(5)
[5, 4, 3, 2, 1]
>>>
>>> _old_rec = rec
>>> def rec(x):
...     print "Calling rec"
...     return _old_rec(x)
...
>>> rec(5)
Calling rec
Calling rec
Calling rec
Calling rec
Calling rec
Calling rec
[5, 4, 3, 2, 1]

Note too that if you're given an arbitrary function, there's no simple 
way of telling whether it's recursive or not. Properly written "self-
reflective" functions using my proposed technique should be immune to 
this problem.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May  8 20:47:24 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 00:47:24 GMT
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<0vadnQqkdrdQz5nXnZ2dnUVZ_uOdnZ2d@pdx.net>
	<mailman.5308.1241806970.11746.python-list@python.org>
Message-ID: <0214c5da$0$20647$c3e8da3@news.astraweb.com>

On Fri, 08 May 2009 14:22:32 -0400, Terry Reedy wrote:

> Scott David Daniels wrote:
> 
>> <rant>It would be a bit easier if people would bother to mention their
>> Python version, as we regularly get questions from people running 2.3,
>> 2.4, 2.5, 2.6, 2.7a, 3.0, and 3.1b.  They run computers with differing
>> operating systems and versions such as: Windows 2000, OS/X Leopard,
>> ubuntu Hardy Heron, SuSE, ....
> 
> And if they copy and paste the actual error messages instead of saying
> 'It doesn't work'

"I tried to copy and paste the actual error message, but it doesn't 
work..."


*grin*


-- 
Steven


From namekuseijin at gmail.com  Fri May  8 20:47:30 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 8 May 2009 17:47:30 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
Message-ID: <9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>

On May 8, 7:22?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 8, 1:56?pm, namekuseijin <namekusei... at gmail.com> wrote:
> > Carl Banks escreveu:
> > > 2. However, functional programming is cryptic at some level no matter
> > > how nice you make the syntax.
>
> > When your program is nothing but function definition and function
> > application, syntax is meaningless.
>
> For mere function application you could maybe argue that (and it'd be
> a stretch), but there is no reasonable way to claim that syntax is
> meaningless for defining functions. ?Unless you meant "function
> declaration", and I think you did because you don't seem to know what
> functional programming is.
>
> > ?you're just calling functions provided by
> > the host,
>
> That's not what functional programming means, nor is it remotely
> comparable to functional programming.

My point is that when all you do is call functions, syntax is
irrelevant.  You call functions pretty much in the same way regardless
of language:  functionname, optionalOpenPar, parameters,
optionalClosePar.  Office automation is all about calling predefined
functions in the host application, that's all my example was about.

Functional programming is all about defining functions and applying
functions.  Core ML, Haskell and Scheme are all like that, pretty much
an extended lambda calculus.  Haskell provides a bunch of syntatic
sugar, more so than Scheme for instance, but in the end, it all gets
converted into lambda expressions and application of arguments to
lambda expressions.

Python has a bunch of handy predefined syntax, because not everything
can be defined out of functions alone.  Syntax is much more important
here than in true functional programming languages, where pretty much
everything besides basic "if" branching is a "userland" function --
including looping constructs.  I have written my own list
comprehensions and generators in Scheme!

When you read a Haskell or Scheme program, it's truly hard to spot
predefined syntax:  most of it is composable function application.
Once in a while you spot an "if".

> > barely using any syntax or intrinsic language feature anyway.
> > ? Any language will do just fine.
>
> Well, that's not true since I found it to be quite a different
> experience to invoke Microsoft library functions ?in JScript than in
> Visual Basic. ?(Mostly because it's a PITA even to "barely use any
> syntax or intrinsic language feature" of Visual Basic.)

Not quite Word, but here's in OpenOffice scripted either in BeanShell,
JScript and Java:
http://wiki.services.openoffice.org/wiki/Documentation/DevGuide/Scripting/Writing_Macros

oDoc = context.getDocument();
xTextDoc = (XTextDocument) UnoRuntime.queryInterface
(XTextDocument.class,oDoc);
xText = xTextDoc.getText();
xTextRange = xText.getEnd();
xTextRange.setString( "Hello World (in BeanShell)" );

oDoc = XSCRIPTCONTEXT.getDocument();
xTextDoc = UnoRuntime.queryInterface(XTextDocument,oDoc);
xText = xTextDoc.getText();
xTextRange = xText.getEnd();
xTextRange.setString( "Hello World (in JavaScript)" );

XTextDocument xtextdocument = (XTextDocument) UnoRuntime.queryInterface
(
                                               XTextDocument.class,
xDocModel);
XText xText = xtextdocument.getText();
XTextRange xTextRange = xText.getEnd();
xTextRange.setString( "Hello World (in Java)" );

Although this is a bad example because of the closeness of syntax
between the languages, it would not be much different in a completely
alien language.  It would still make a call to get the data model of
the current document, another to get the text, another to get the end
and another to set the string.  It's all function calls, really.

No, it's not functional programming, but it illustrates what I said:
when all you do is call functions, syntax is irrelevant.


From http  Fri May  8 20:49:51 2009
From: http (Paul Rubin)
Date: 08 May 2009 17:49:51 -0700
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
Message-ID: <7x1vqzaymo.fsf@ruckus.brouhaha.com>

Casey Hawthorne <caseyhHAMMER_TIME at istar.ca> writes:
> Would it be possible to more clearly separate the pure code (without
> side effects) from the impure code (that deals with state changes,
> I/O, etc.), so that the pure code could be compiled and have
> aggressive functional transformations applied to it for efficiency.

This doesn't fit Python semantics terribly well.

> That way, the syntax would be a lot easier to understand, than most
> functional languages, like Haskell.

I don't think it would help much, even if it was done (see below).

> I gave a presentation at the beginning of last year on Haskell and at
> the end, someone's comment was, "I can see the benefits of functional
> programming but why does it have to be so cryptic."

Haskell's syntax (like Python's or Lisp's) takes a little getting used
to, but in my experience it's not really cryptic.  IMHO, functional
programming is difficult for imperative programmers to understand at
first, because the concepts in it are really different from what
imperative programmers are generally used to, and that take some head
scratching to make sense of.  Think of a beginning imperative
programmer encountering recursion or coroutines for the first time, or
how someone learning calculus deals with the concepts of limits and
continuity.  These subjects have certain hurdles that require effort
to get past, but which expand the range of problems that someone who
has put in the effort can solve.  Functional programming presents more
such hurdles, and more such expansion.


From steve at REMOVE-THIS-cybersource.com.au  Fri May  8 20:51:46 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 00:51:46 GMT
Subject: Simple programme - Just want to know whether this is correct
	way of coding
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
Message-ID: <0214c6e0$0$20647$c3e8da3@news.astraweb.com>

On Thu, 07 May 2009 23:37:27 -0700, guptha wrote:

> The code Works fine ,but I doubt about the performance issue ,My
> intention is to send mails concurrently to large number of mail. 1.For
> every mail id i send It creates a new SMTP object,in case, if i send to
> 1000 or more ids
>       a) It obliviously creates that much SMPT connections ,is this a
> right approach .

Why do you care? I assume you're running this code on a botnet, so why 
care about performance?

[ha ha only serious]


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May  8 20:52:20 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 00:52:20 GMT
Subject: Why there is a parameter named "self" for classmethod function?
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>
	<4A024F18.9080407@kbsymanzik.org>
	<mailman.5206.1241671190.11746.python-list@python.org>
	<pan.2009.05.07.06.29.56@REMOVE.THIS.cybersource.com.au>
	<2c80e8d0-cc44-48b3-8b90-7b165eb20ed4@g20g2000vba.googlegroups.com>
Message-ID: <0214c701$0$20647$c3e8da3@news.astraweb.com>

On Thu, 07 May 2009 04:27:15 -0700, Aaron Brady wrote:

>> Can be, but if there's reason enough to keep it with a class, there's
>> no reason not to.
> 
> That's a bit of hyperbole; the usual reasons such as code bloat,
> namespace bloat, maintainability etc. all weigh against it.  It's just
> that the benefits weigh heavier.

I'm not sure I understand. Whether the function is in the class or 
extracted out into the module, it is exactly the same function. (Apart 
from an extra level of indentation, and either an unused "self" parameter 
or a @staticmethod line.) Same amount of code, same difficulty of 
maintainability. Namespace bloat is also the same, the only difference 
being which namespace is bloated: the class or the method.


-- 
Steven


From pavlovevidence at gmail.com  Fri May  8 21:13:44 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 8 May 2009 18:13:44 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
Message-ID: <7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>

On May 8, 5:47?pm, namekuseijin <namekusei... at gmail.com> wrote:
> My point is that when all you do is call functions, syntax is
> irrelevant. ?You call functions pretty much in the same way regardless
> of language: ?functionname, optionalOpenPar, parameters,
> optionalClosePar.

then...

> Functional programming is all about defining functions and applying
> functions. ?Core ML, Haskell and Scheme are all like that,

Yet all three use a different syntax to call functions, none of them
the "pretty much the same way" you listed above.

Haskell, Python, and (I think) ML can define operators with different
syntax than function calls, that matters.

Haskell and Python have syntax for list operations, that matters.

Haskell nexts using indentation, the others nest using tokens(**),
that matters.

I can go on, but you get the idea.  Point is: functional programmint
isn't "nothing but calling functions".

[snip irrelevant stuff about office scripting]

Carl Banks

(**) Python does using indentation to nest, of course, but not at the
expression level.


From http  Fri May  8 21:36:41 2009
From: http (Paul Rubin)
Date: 08 May 2009 18:36:41 -0700
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
Message-ID: <7xmy9nnjkm.fsf@ruckus.brouhaha.com>

Carl Banks <pavlovevidence at gmail.com> writes:
> I can go on, but you get the idea.  Point is: functional programmint
> isn't "nothing but calling functions".

I would mainly describe functional programming as programming with the
pervasive use of higher order functions.  For example, loops in
functional programming can be implemented using recursion, but in
practice, one doesn't see actual explicit recursion in Haskell code
all that often.  Instead we see wide use of functions like map,
filter, and fold (a/k/a "reduce"), which can take the place of looping
constructs.

Python also has higher-order functions like that, but their use is
disfavored in certain circles.  With Python 3, there has actually been
movement towards removing them from the language.


From namekuseijin at gmail.com  Fri May  8 22:19:21 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 8 May 2009 19:19:21 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com> 
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
Message-ID: <ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>

On May 8, 10:13?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 8, 5:47?pm, namekuseijin <namekusei... at gmail.com> wrote:
>
> > My point is that when all you do is call functions, syntax is
> > irrelevant. ?You call functions pretty much in the same way regardless
> > of language: ?functionname, optionalOpenPar, parameters,
> > optionalClosePar.
>
> then...
>
> > Functional programming is all about defining functions and applying
> > functions. ?Core ML, Haskell and Scheme are all like that,
>
> Yet all three use a different syntax to call functions, none of them
> the "pretty much the same way" you listed above.

It's still functionName arguments AFAIK.  Some using parentheses
around the arguments, some around all, some not using parentheses at
all.

> Haskell and Python have syntax for list operations, that matters.
>
> Haskell nexts using indentation, the others nest using tokens(**),
> that matters.

In Haskell, Lisp and other functional programming languages, any extra
syntax gets converted into the core lambda constructs.  In Lisp
languages, that syntax is merely user-defined macros, but in Haskell
it's builtin the compiler for convenience.

> I can go on, but you get the idea. ?Point is: functional programmint
> isn't "nothing but calling functions".

Oh yes, functional programming is all about function definition and
function calling.  You have a point about higher order functions, but
that's really only useful as far as your lambda expressions are useful
-- that is, conveniently defining anonymous functions on-the-fly and
immediately applying them.


From namekuseijin at gmail.com  Fri May  8 22:22:26 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 8 May 2009 19:22:26 -0700 (PDT)
Subject: Simple programme - Just want to know whether this is correct way 
	of coding
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
Message-ID: <7d44d587-15c7-40ea-abe2-6a174f1fd0cd@q14g2000vbn.googlegroups.com>

On May 8, 3:37?am, guptha <gjango... at gmail.com> wrote:
> The code Works fine ,but I doubt about the performance issue ,My
> intention is to send mails concurrently to large number of mail.
> 1.For every mail id i send It creates a new SMTP object,in case, if i
> send to 1000 or more ids

why should I help a spammer... ;)


From li.wang.d at gmail.com  Fri May  8 22:59:31 2009
From: li.wang.d at gmail.com (Li Wang)
Date: Sat, 9 May 2009 12:59:31 +1000
Subject: Python 2.6, File read() problems in Windows Xp
In-Reply-To: <4A049811.9010600@ieee.org>
References: <11aabe3b0905072204w499679f8q9d1be6d63cddd597@mail.gmail.com>
	<4A03DE84.40406@ieee.org>
	<11aabe3b0905080208x5df4df5bu4eec2712d842320@mail.gmail.com>
	<4A049811.9010600@ieee.org>
Message-ID: <11aabe3b0905081959x5a0a0c80jde3dc500f9ccda9b@mail.gmail.com>

> (my smtp mail server has been down for a few hours, so you have some other
> responses.)
>
> yes, as far as I can tell from the docs, the 'b' flag doesn't matter in
> Unix/Linux.  Note that I haven't actually been on a Unix machine since
> starting with Python, but it matches what else I know.  And if it's
> different in Python 3.0, I wouldn't know that either.,

Thank you very much!


-- 
Li
------
Time is all we have
and you may find one day
you have less than you think


From apt.shansen at gmail.com  Fri May  8 23:05:10 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 8 May 2009 20:05:10 -0700
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
In-Reply-To: <7xmy9nnjkm.fsf@ruckus.brouhaha.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com> 
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com> 
	<7xmy9nnjkm.fsf@ruckus.brouhaha.com>
Message-ID: <7a9c25c20905082005r7c3e5ec4y57e95a681fe5cba1@mail.gmail.com>

> Python also has higher-order functions like that, but their use is
> disfavored in certain circles.  With Python 3, there has actually been
> movement towards removing them from the language.


... Buh? Reduce was moved to functools, map and filter weren't touched;
there was some discussion before Python 3 was released to remove them in
favor of new Python tools(comprehensions, itertools, and whatever else), but
they decided not to. You can't call that movement; they're now here to stay.
Maybe when Python 4000 comes around Guido might consider it again and not
get talked out of it this that time-- but there's no way that they're going
to be deprecated or removed in the next ten years at this point. It'd be
code-breakage on a massive scale.

Some people don't like them. But there's quite a few Pythoniacs who do and
use them to great effect. Don't make it sound like they're some dangerous
thing which has a looming deprecation over its head so it shouldn't be
bothered with.

--S
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From ross.jett at gmail.com  Fri May  8 23:17:15 2009
From: ross.jett at gmail.com (Ross)
Date: Fri, 8 May 2009 20:17:15 -0700 (PDT)
Subject: slice iterator?
Message-ID: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>

I have a really long list that I would like segmented into smaller
lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
a way to do this without explicitly defining new lists? If the above
problem were to be split into groups of 3, I've tried something like:

start = 0
stop = 3
for i in range(len(a)):
    segment = a[start:stop]
    print segment
    start += stop
    stop += stop

Unfortunately start and stop don't increment using this code. Ideally,
my outcome would be
[1,2,3]
[4,5,6]
[7,8,9]
[10,11,12]


From http  Fri May  8 23:29:51 2009
From: http (Paul Rubin)
Date: 08 May 2009 20:29:51 -0700
Subject: slice iterator?
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
Message-ID: <7xprejoswg.fsf@ruckus.brouhaha.com>

Ross <ross.jett at gmail.com> writes:
> I have a really long list that I would like segmented into smaller
> lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> a way to do this without explicitly defining new lists? 

That question comes up so often it should probably be a standard
library function.

Anyway, here is an iterator, if that's what you want:

   >>> from itertools import islice
   >>> a = range(12)
   >>> xs = iter(lambda x=iter(a): list(islice(x,3)), [])
   >>> print list(xs)
   [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10, 11]]

Of course, as the saying goes, there's more than one way to do it ;-)


From davea at ieee.org  Fri May  8 23:45:46 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 08 May 2009 23:45:46 -0400
Subject: import overwrites __name__
In-Reply-To: <gu27cl$3kg$1@ger.gmane.org>
References: <gu1pad$afi$1@ger.gmane.org> <gu27cl$3kg$1@ger.gmane.org>
Message-ID: <4A04FC6A.3020802@ieee.org>

Marco wrote:
> Marco wrote:
>
>   
>> Hi,
>>
>> There happened something that I do not understand. Actually I don't even
>> know how it can be possible.
>>
>> I import a module and then the name space of the importing module seems do
>> be overwritten.
>>
>> my_name = __name__
>> print my_name
>> print len(dir())
>> from x import y as z
>> print __name__
>> print len(dir())
>> print my_name
>>
>> ->
>> __main__
>> 119
>> x
>> 117
>> unhandled NameError "name 'my_name' is not defined"
>>
>> The module x is from me, and I am not aware of doing anything cruel there.
>> What evil thing can be done in its sub module that can result in that
>> strange thing?
>>     
>
>
> I just discovered the .pyc file for the main module is not created. When I 
> delete the old pyc and import the main module from the python shell it works 
> fine. But when I start it with "python main_module.py" the .pyc is not 
> created and it happens as shown above.
>
> So what leads to the behavior that the .pyc is not created?
>
> br
> Marco
>
>
>   
As others have said, you didn't post nearly enough of your code to 
duplicate the problem.  But I have a reasonable guess:

I suspect you've got two modules that each import the other.  If you run 
one of them as the (__main__) script from the command line, you get some 
pretty weird behavior.  To put it simply, don't ever do an import of 
"main_module" if you expect to be able to run "python main_module.py"

I suspect the underlying cause is that that module is called __name__  ( 
you know that if you've ever coded  if __name__ == "__main__"    When 
you try to import it by its actual file name, it thinks it's a new one.  
And you don't ever want two instances of the same module.  You end up 
with two copies of the global variables, and some code refers to one and 
some refers to the other, for example.

You can get into trouble any time you have mutual importing (a imports 
b., and b import a) or indirect mutual importing (a imports b, which 
imports c, which imports a).  Many languages have similar problems, as 
do Windows DLL's.  But it's even worse if your __main__ script is in the 
mix.

As Stephen suggests, write a very small script which does the initial 
import.




From research at johnohagan.com  Fri May  8 23:48:48 2009
From: research at johnohagan.com (John O'Hagan)
Date: Sat, 9 May 2009 03:48:48 +0000
Subject: slice iterator?
In-Reply-To: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
Message-ID: <200905090348.48444.research@johnohagan.com>

On Sat, 9 May 2009, Ross wrote:
> lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> a way to do this without explicitly defining new lists? If the above
> problem were to be split into groups of 3, I've tried something like:
>
> start = 0
> stop = 3
> for i in range(len(a)):
> ? ? segment = a[start:stop]
> ? ? print segment
> ? ? start += stop
> ? ? stop += stop

This doesn't work because you're looping over every element in your list 
(instead of every slice) and because you're incrementing the increment by 
using "stop" for two different things (endpoint and increment).

This seems to work:

>>> for i in range (len(a) / 3):
...     segment = a[3 * i:3 * (i + 1)]
...     print segment

Regards,

john


From lie.1296 at gmail.com  Fri May  8 23:58:46 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sat, 09 May 2009 03:58:46 GMT
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
Message-ID: <Wb7Nl.9780$y61.3614@news-server.bigpond.net.au>

Casey Hawthorne wrote:
> I'm intrigued that Python has some functional constructions in the
> language.
> 
> Would it be possible to more clearly separate the pure code (without
> side effects) from the impure code (that deals with state changes,
> I/O, etc.), so that the pure code could be compiled and have
> aggressive functional transformations applied to it for efficiency.

Choosing a better algorithm usually have much more impact on efficiency 
than programming to the language's optimization scheme. A slow algorithm 
will always be slow no matter how much (functional or regular) 
optimization in it[1]. If you bother efficiency that much, maybe python 
is not the best suited language for you.

> That way, the syntax would be a lot easier to understand, than most
> functional languages, like Haskell.

Python's syntax is already easier to understand than most functional 
language, and it also support functional-style programming. However, 
python is still an imperative language, no matter how much functional 
functionalities (pun not intended) is in it.


[1] of course there are certain types of optimizations -- that actually 
changes the algorithm -- that may have a significant impact, such as 
memoization. However if you know memoization well enough, you wouldn't 
want to activate it on all pure functions...


From research at johnohagan.com  Sat May  9 00:05:13 2009
From: research at johnohagan.com (John O'Hagan)
Date: Sat, 9 May 2009 04:05:13 +0000
Subject: slice iterator?
In-Reply-To: <200905090348.48444.research@johnohagan.com>
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
	<200905090348.48444.research@johnohagan.com>
Message-ID: <200905090405.14088.research@johnohagan.com>

On Sat, 9 May 2009, John O'Hagan wrote:
> On Sat, 9 May 2009, Ross wrote:
> > lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> > wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> > a way to do this without explicitly defining new lists? If the above
> > problem were to be split into groups of 3, I've tried something like:
[..]
>
> This seems to work:
> >>> for i in range (len(a) / 3):
>
> ...     segment = a[3 * i:3 * (i + 1)]
> ...     print segment
[...]

But if len(a) is not divisible by the increment, that misses the last (short) 
slice, so using the step argument to range:

>>> for i in range (0, len(a), 3):
...     segment = a[i:i + 3]
...     print segment

is better. Or as a list comprehension:

[a[i:i + 3] for i in range (0, len(a), 3)]


HTH,

John


From nad at acm.org  Sat May  9 00:14:32 2009
From: nad at acm.org (Ned Deily)
Date: Sat, 09 May 2009 00:14:32 -0400
Subject: slice iterator?
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
	<7xprejoswg.fsf@ruckus.brouhaha.com>
Message-ID: <nad-271FBD.00143109052009@ger.gmane.org>

In article <7xprejoswg.fsf at ruckus.brouhaha.com>,
 Paul Rubin <http://phr.cx at NOSPAM.invalid> wrote:
> Ross <ross.jett at gmail.com> writes:
> > I have a really long list that I would like segmented into smaller
> > lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> > wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> > a way to do this without explicitly defining new lists? 
> 
> That question comes up so often it should probably be a standard
> library function.
> 
> Anyway, here is an iterator, if that's what you want:
>    >>> from itertools import islice
>    >>> a = range(12)
>    >>> xs = iter(lambda x=iter(a): list(islice(x,3)), [])
>    >>> print list(xs)
>    [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10, 11]]
> Of course, as the saying goes, there's more than one way to do it ;-)

python2.6 itertools introduces the izip_longest function and the grouper 
recipe <http://docs.python.org/library/itertools.html>:

def grouper(n, iterable, fillvalue=None):
    "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
    args = [iter(iterable)] * n
    return izip_longest(fillvalue=fillvalue, *args)

-- 
 Ned Deily,
 nad at acm.org



From fetchinson at googlemail.com  Sat May  9 00:34:54 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Fri, 8 May 2009 21:34:54 -0700
Subject: mod_python and xml.dom.minidom
In-Reply-To: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
Message-ID: <fbe2e2100905082134q76dc2354n3d50f437e70a5d5f@mail.gmail.com>

On 5/8/09, dpapathanasiou <denis.papathanasiou at gmail.com> wrote:
> I wrote a python script called xml_utils.py which parses xml using
> minidom.
>
> It works when it's run on its own, but when I try to import it and run
> it inside a mod_python handler, I get this error:
>
>   File "../common/xml_utils.py", line 80, in parse_item_attribute
>   File "/usr/lib/python2.5/xml/dom/minidom.py", line 1924, in
> parseString
>     from xml.dom import expatbuilder
> SystemError: Parent module 'xml.dom' not loaded
>
> Basically, it's the same problem I found in this post:
> http://mail.python.org/pipermail/python-list/2007-January/424018.html
>
> This site (http://www.dscpl.com.au/wiki/ModPython/Articles/
> ExpatCausingApacheCrash) goes through a detailed explanation, and I
> found that the version of pyexpat is newer than libexpat:
>
> # ldd /usr/local/apache2/bin/httpd | grep expat
> 	libexpat.so.0 => /usr/local/apache2/lib/libexpat.so.0 (0xb7f71000)
> # strings /usr/local/apache2/lib/libexpat.so.0 | grep expat_
> expat_1.95.2
>
> $ python
> Python 2.5.2 (r252:60911, Jan  4 2009, 17:40:26)
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import pyexpat
>>>> pyexpat.version_info
> (2, 0, 0)
>
> But this is where I'm stuck: the article suggests recompiling apache
> with the newer version of expat.
>
> Apache's configure utility (I'm using httpd version 2.2.11) doesn't
> explicitly describe an expat library option.
>
> Also, if libexpat is version 1.95.2, wouldn't I have to get version
> 2.0 to be compatible with pyexpat?
>
> If anyone has any advice or suggestions, I'd appreciate hearing them.

My only advice is, don't use mod_python. The project is dead, you
should use mod_wsgi instead: http://code.google.com/p/modwsgi/

Cheers,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From timr at probo.com  Sat May  9 00:36:35 2009
From: timr at probo.com (Tim Roberts)
Date: Fri, 08 May 2009 21:36:35 -0700
Subject: ISO exemplary Python scripts
References: <gu2j3n$a90$1@reader1.panix.com>
Message-ID: <802a051qoqmpnih0j2su9hhriqumagu326@4ax.com>

kj <socyl at 987jk.com.invalid> wrote:
>
>I'm learning python, for the umpteenth time.  This time I decided
>to start out by writing Python scripts for everyday tasks.  Most
>of these scripts are meant to be used only once or twice, but a
>few of them have become useful enough that I'd like to make them
>a little bit more solid...
>
>I'd like to learn from well-written Python scripts, with well-structured
>options parsing, good error and help messages, clear organization,
>etc.
>
>Can someone point me to good examples of Python scripts?

The standard library that was installed with your interpreter is one of the
best repositories.  It contains hundreds of working, well-tested scripts,
most of which have the ability to run by themselves.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From anuraguniyal at yahoo.com  Sat May  9 00:44:39 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 8 May 2009 21:44:39 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<0vadnQqkdrdQz5nXnZ2dnUVZ_uOdnZ2d@pdx.net>
Message-ID: <d8876306-5df4-464c-acf5-b58905c5594e@y34g2000prb.googlegroups.com>

sorry for not being specfic and not given all info

"""
Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52)
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
'Linux-2.6.24-19-generic-i686-with-debian-lenny-sid'
"""

My question has not much to do with stdout because I am able to print
unicode
so
print unicode(a) works
print unicode([a]) doesn't

without print too
s1 = u"%s"%a works
s2 = u"%s"%[a] doesn't
niether does s3 = u"%s"%unicode([a])
error is UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in
position 1: ordinal not in range(128)

so question is how can I use a list of object whose representation
contains unicode in another unicode string

I am now using __repr__ = unicode(self).encode("utf-8")
but it give error anyway


From ldo at geek-central.gen.new_zealand  Sat May  9 00:47:15 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 09 May 2009 16:47:15 +1200
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net> <gu29cb$8gg$1@lust.ihug.co.nz>
	<692b7ae8-0c5b-498a-a012-51bda980f3b9@s28g2000vbp.googlegroups.com>
Message-ID: <gu31sj$mk8$2@lust.ihug.co.nz>

In message <692b7ae8-0c5b-498a-
a012-51bda980f3b9 at s28g2000vbp.googlegroups.com>, namekuseijin wrote:

> On May 8, 6:48 pm, Lawrence D'Oliveiro <l... at geek-
> central.gen.new_zealand> wrote:
>> In message <gu269i$16i... at adenine.netfront.net>, namekuseijin wrote:
>>
>> > Carl Banks escreveu:
>>
>> >> 2. However, functional programming is cryptic at some level no matter
>> >> how nice you make the syntax.
>>
>> > When your program is nothing but function definition and function
>> > application, syntax is meaningless.
>>
>> On the contrary, syntax is vital to the correct interpretation of
>> functional constructs. See, for example,
>> <http://mail.python.org/pipermail/python-list/2008-October/683816.html>.
> 
> Yeah, it's important in an imperative language ...

That was an example of functional programming.



From ldo at geek-central.gen.new_zealand  Sat May  9 00:48:48 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 09 May 2009 16:48:48 +1200
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
	<gu0ofm$oj9$00$1@news.t-online.com> <gu141o$iek$4@lust.ihug.co.nz>
	<mailman.5285.1241786958.11746.python-list@python.org>
Message-ID: <gu31vg$mk8$3@lust.ihug.co.nz>

In message <mailman.5285.1241786958.11746.python-list at python.org>, andrew 
cooke wrote:

> Lawrence D'Oliveiro wrote:
>> In message <gu0ofm$oj9$00$1 at news.t-online.com>, Peter Otten wrote:
>>
>>> While it may not matter here using placeholders instead of manually
>>> escaping user-provided values is a good habit to get into.
>>
>> Until you hit things it can't deal with.
> 
> Can you expand on your comment?  I assume you are thinking of how the
> library might handle some strange class.

Consider something as simple as a "like" clause.



From Scott.Daniels at Acm.Org  Sat May  9 00:49:43 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 08 May 2009 21:49:43 -0700
Subject: slice iterator?
In-Reply-To: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
Message-ID: <upudnag_m9Gul5jXnZ2dnUVZ_uadnZ2d@pdx.net>

Ross wrote:
> I have a really long list that I would like segmented into smaller
> lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> a way to do this without explicitly defining new lists? If the above
> problem were to be split into groups of 3, I've tried something like:
> ... Ideally, my outcome would be
> [1,2,3]
> [4,5,6]
> [7,8,9]
> [10,11,12]

     for i in range(0, len(a), 3):
         segment = a[i : i +3]
         print segment

--Scott David Daniels
Scott.Daniels at Acm.Org


From ldo at geek-central.gen.new_zealand  Sat May  9 00:50:55 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 09 May 2009 16:50:55 +1200
Subject: SQL and CSV
References: <fcd941df-cccb-4e68-8cb4-815da0d219e7@l28g2000vba.googlegroups.com>
	<mailman.5108.1241540370.11746.python-list@python.org>
	<1d2bb50f-2e3f-429b-aa98-7e1fe1f011b0@t10g2000vbg.googlegroups.com>
	<mailman.5120.1241551659.11746.python-list@python.org>
	<fbf1d030-37df-4a85-b61a-a6213c114f60@g20g2000vba.googlegroups.com>
	<gu0ofm$oj9$00$1@news.t-online.com> <gu141o$iek$4@lust.ihug.co.nz>
	<mailman.5285.1241786958.11746.python-list@python.org>
	<b7c68e74-21ae-4133-a058-e3c669f0faf6@o20g2000vbh.googlegroups.com>
	<mailman.5299.1241800722.11746.python-list@python.org>
Message-ID: <gu323f$mk8$4@lust.ihug.co.nz>

In message <mailman.5299.1241800722.11746.python-list at python.org>, andrew 
cooke wrote:

> even if you're not open to injection attacks, you're still less likely to
> get escaping correct than a puprose written, widely used library.

Escaping isn't really that hard to do. For example, the rules for MySQL 
literals are clearly spelled out here 
<http://dev.mysql.com/doc/refman/5.0/en/string-syntax.html>. You can easily 
check that against my quoting routines here 
<http://codecodex.com/wiki/index.php?title=Useful_MySQL_Routines#Quoting>.



From apt.shansen at gmail.com  Sat May  9 00:50:59 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 8 May 2009 21:50:59 -0700
Subject: mod_python and xml.dom.minidom
In-Reply-To: <fbe2e2100905082134q76dc2354n3d50f437e70a5d5f@mail.gmail.com>
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<fbe2e2100905082134q76dc2354n3d50f437e70a5d5f@mail.gmail.com>
Message-ID: <7a9c25c20905082150y6a8bd08cnaa32fefdfce8ae1e@mail.gmail.com>

>
> My only advice is, don't use mod_python. The project is dead, you
>  should use mod_wsgi instead: http://code.google.com/p/modwsgi/
>

To echo what Daniel said, mod_wsgi is really the way to go. It might still
not work in "embedded" mode where like mod_python the Python interpreter is
in the Apache instance thus there might be binary linking conflicts, but you
can use it in daemon mode where it launches external python processes and
passes requests back and forth through them. That's not as slow as it sounds
too :)

Also maybe check out lxml or ElementTree (cElementTree); minidom is about
*the* slowest way to parse XML in Python I believe. And is terribly
unpythonic-- which may be why you made xml_utils, I dunno. Check out
lxml/ElementTree :)

--S
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From pavlovevidence at gmail.com  Sat May  9 00:52:22 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 8 May 2009 21:52:22 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com> 
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com> 
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
Message-ID: <e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>

On May 8, 7:19?pm, namekuseijin <namekusei... at gmail.com> wrote:
> On May 8, 10:13?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>
> > On May 8, 5:47?pm, namekuseijin <namekusei... at gmail.com> wrote:
>
> > > My point is that when all you do is call functions, syntax is
> > > irrelevant. ?You call functions pretty much in the same way regardless
> > > of language: ?functionname, optionalOpenPar, parameters,
> > > optionalClosePar.
>
> > then...
>
> > > Functional programming is all about defining functions and applying
> > > functions. ?Core ML, Haskell and Scheme are all like that,
>
> > Yet all three use a different syntax to call functions, none of them
> > the "pretty much the same way" you listed above.
>
> It's still functionName arguments AFAIK. ?Some using parentheses
> around the arguments, some around all, some not using parentheses at
> all.

Some using commas, some not, some grouping arguments by arity, some
not, some allowing keyword argument, some not, etc.  Point is, even
the thing you claim hardly varies between languages does vary a
significant bit, but it's not nearly as much as other syntactic
differences in functional languages.


> > Haskell and Python have syntax for list operations, that matters.
>
> > Haskell nexts using indentation, the others nest using tokens(**),
> > that matters.
>
> In Haskell, Lisp and other functional programming languages, any extra
> syntax gets converted into the core lambda constructs.

So?  The user still uses that syntax, so how can you claim it doesn't
matter?


>?In Lisp
> languages, that syntax is merely user-defined macros, but in Haskell
> it's builtin the compiler for convenience.

I don't even know what you're saying here


> > I can go on, but you get the idea. ?Point is: functional programmint
> > isn't "nothing but calling functions".
>
> Oh yes, functional programming is all about function definition and
> function calling.

Fine.

Functional programming isn't "nothing but calling functions USING
FUNCTION-CALL SYNTAX".


>?You have a point about higher order functions, but
> that's really only useful as far as your lambda expressions are useful
> -- that is, conveniently defining anonymous functions on-the-fly and
> immediately applying them.

I made no such point.  You may be confusing me with Paul, and I can't
imagine what higher-order functions have to do with whether syntax is
important or not.


Carl Banks


From ptmcg at austin.rr.com  Sat May  9 01:04:33 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Fri, 8 May 2009 22:04:33 -0700 (PDT)
Subject: slice iterator?
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
	<7xprejoswg.fsf@ruckus.brouhaha.com>
	<mailman.5327.1241842488.11746.python-list@python.org>
Message-ID: <d6b9a688-5294-4b96-a69e-0c48a33216c0@h23g2000vbc.googlegroups.com>

On May 8, 11:14?pm, Ned Deily <n... at acm.org> wrote:
> In article <7xprejoswg.... at ruckus.brouhaha.com>,
> ?Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>
>
>
>
>
> > Ross <ross.j... at gmail.com> writes:
> > > I have a really long list that I would like segmented into smaller
> > > lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> > > wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> > > a way to do this without explicitly defining new lists?
>
> > That question comes up so often it should probably be a standard
> > library function.
>
> > Anyway, here is an iterator, if that's what you want:
> > ? ?>>> from itertools import islice
> > ? ?>>> a = range(12)
> > ? ?>>> xs = iter(lambda x=iter(a): list(islice(x,3)), [])
> > ? ?>>> print list(xs)
> > ? ?[[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10, 11]]
> > Of course, as the saying goes, there's more than one way to do it ;-)
>
> python2.6 itertools introduces the izip_longest function and the grouper
> recipe <http://docs.python.org/library/itertools.html>:
>
> def grouper(n, iterable, fillvalue=None):
> ? ? "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
> ? ? args = [iter(iterable)] * n
> ? ? return izip_longest(fillvalue=fillvalue, *args)
>
> --
> ?Ned Deily,
> ?n... at acm.org- Hide quoted text -
>
> - Show quoted text -

Here's a version that works pre-2.6:

>>> grouper = lambda iterable,size,fill=None : zip(*[(iterable+[fill,]*(size-1))[i::size] for i in range(size)])
>>> a = range(12)
>>> grouper(a,6)
[(0, 1, 2, 3, 4, 5), (6, 7, 8, 9, 10, 11)]
>>> grouper(a,5)
[(0, 1, 2, 3, 4), (5, 6, 7, 8, 9), (10, 11, None, None, None)]
>>> grouper(a,3)
[(0, 1, 2), (3, 4, 5), (6, 7, 8), (9, 10, 11)]

-- Paul


From stefan_ml at behnel.de  Sat May  9 01:07:25 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 09 May 2009 07:07:25 +0200
Subject: mod_python and xml.dom.minidom
In-Reply-To: <mailman.5328.1241843700.11746.python-list@python.org>
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<mailman.5328.1241843700.11746.python-list@python.org>
Message-ID: <4a050f8d$0$31862$9b4e6d93@newsspool3.arcor-online.net>

Daniel Fetchinson wrote:
> On 5/8/09, dpapathanasiou wrote:
>> I wrote a python script called xml_utils.py which parses xml using
>> minidom.
> 
> My only advice is, don't use mod_python. The project is dead, you
> should use mod_wsgi instead: http://code.google.com/p/modwsgi/

Now that we're at it anyway: don't use minidom, either. It's rather slow
and very memory expensive. The stdlib comes with ElementTree since Python 2.5.

http://effbot.org/zone/celementtree.htm#benchmarks

Stefan


From ldo at geek-central.gen.new_zealand  Sat May  9 02:44:47 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 09 May 2009 18:44:47 +1200
Subject: bulk_copy
Message-ID: <gu38ov$qk7$2@lust.ihug.co.nz>

Every now and then I've had the need to copy a bunch of records in a MySQL 
table--perhaps take a copy of some production data into a test database to 
track down a bug, that kind of thing. So I wrote a utility to do it.

<http://github.com/ldo/bulk_copy/tree/master>



From anuraguniyal at yahoo.com  Sat May  9 03:04:46 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Sat, 9 May 2009 00:04:46 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
Message-ID: <977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>

also not sure why (python 2.5)
print a # works
print unicode(a) # works
print [a] # works
print unicode([a]) # doesn't works


From george.sakkis at gmail.com  Sat May  9 03:48:53 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Sat, 9 May 2009 00:48:53 -0700 (PDT)
Subject: Self function
References: <5e36fb9c-dc1e-40de-bbe4-55eb46210b00@v17g2000vbb.googlegroups.com>
	<m2iqkhnzxy.fsf@googlemail.com>
	<e54bd11f-22bb-4945-83f6-85e1c626292f@r13g2000vbr.googlegroups.com>
	<mailman.5072.1241474108.11746.python-list@python.org>
	<pan.2009.05.05.06.08.22@REMOVE.THIS.cybersource.com.au> 
	<1292fea0-96fb-4a21-b39d-b6ce610ea6b2@t10g2000vbg.googlegroups.com> 
	<4f13a110-b3e5-4de5-b6d6-0d64da20b61e@r34g2000vbi.googlegroups.com> 
	<op.uthious2a8ncjz@gnudebst>
	<op.uthpd9qnx6zn5v@lepton.softlabbsas.com.ar> 
	<op.uti1kf0ga8ncjz@gnudebst> <1241649200.4a0210301f77e@mail.uh.cu> 
	<mailman.5189.1241657949.11746.python-list@python.org>
	<pan.2009.05.07.01.48.28@REMOVE.THIS.cybersource.com.au> 
	<mailman.5200.1241663550.11746.python-list@python.org>
Message-ID: <bd6706f8-cf0b-46bb-92ae-240c9ea99a61@r13g2000vbr.googlegroups.com>

On May 6, 10:32?pm, Luis Alberto Zarrabeitia Gomez <ky... at uh.cu>
wrote:

> A bit offtopic: a while ago I think I saw a recipe for a decorator that, via
> bytecode hacks, would bind otherwise global names to the local namespace of the
> function. Can anyone remember it/point me to it?

Maybe you saw http://code.activestate.com/recipes/277940/ ?

George


From iwan at reahl.org  Sat May  9 04:02:08 2009
From: iwan at reahl.org (Iwan)
Date: Sat, 9 May 2009 01:02:08 -0700 (PDT)
Subject: How to debug this import problem?
References: <mailman.5300.1241802485.11746.python-list@python.org> 
	<76j8vcF1crfkoU1@mid.uni-berlin.de>
	<DumdnY8P7-xs65nXnZ2dnUVZ_jidnZ2d@pdx.net>
Message-ID: <ebc63140-6f1f-44a0-8046-574fb3530fed@s21g2000vbb.googlegroups.com>

Hi Scott, Diez,

On May 8, 8:21?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> Diez B. Roggisch wrote:
> > Try putting an "import pdb; pdb.set_trace()" on top of the decimal module.
[snip]
> You can also run Python with the "-v" or "-vv" flags to get output
> about exactly what files are getting imported from the file
> system and when. ?"-v" iswhat it got, "-vv" is everywhere it tries.

Thanks, yes we did do the pdb.set_trace(), but everything looked fine
(ie, the paths used to import each module from was the same each time)
in there except for the fact that id(sys) and id(decimal) were
different each time decimal got imported.  Python -vv also reveals
that the paths used to import the modules from are always the same
paths and correct.

However, on the stack trace, there is another strangeness:

We have a little script that loads the tests that have to be run.
This loading happens 3 times, and the module is imported 3 times -
each time as a result of loading tests. This happens with the
following line:

module = __import__(moduleName, globals(), locals(), [className])

I was wondering whether this could have something to do with it?

Regards
- Iwan


From __peter__ at web.de  Sat May  9 04:09:24 2009
From: __peter__ at web.de (Peter Otten)
Date: Sat, 09 May 2009 10:09:24 +0200
Subject: heapq.merge with key=
References: <gtvjgk$tm8$1@foggy.unx.sas.com>
	<mailman.5264.1241758129.11746.python-list@python.org>
	<gu1gpj$nue$1@foggy.unx.sas.com>
Message-ID: <gu3dni$tkj$00$1@news.t-online.com>

Kevin D.  Smith wrote:

> On 2009-05-07 23:48:43 -0500, Chris Rebert <clp2 at rebertia.com> said:
> 
>> On Thu, May 7, 2009 at 2:23 PM, Kevin D. Smith <Kevin.Smith at sas.com>
>> wrote:
>>> I need the behavior of heapq.merge to merge a bunch of results from a
>>> database.  I was doing this with sorted(itertools.chain(...), key=
>> ...), but
>>> I would prefer to do this with generators.  My issue is that I need
>> the key
>>> argument to sort on the correct field in the database.  heapq.merge
>> doesn't
>>> have this argument and I don't understand the code enough to know if
>>> it's possible to add it.  Is this enhancement possible without
>>> drasticall
>> y
>>> changing the current code?
>> 
>> I think so. Completely untested code:
>> 
>> def key(ob):
>>     #code here
>> 
>> class Keyed(object):
>>     def __init__(self, obj):
>>         self.obj = obj
>>     def __cmp__(self, other):
>>         return cmp(key(self.obj), key(other.obj))
>> 
>> def keyify(gen):
>>     for item in gen:
>>         yield Keyed(item)
>> 
>> def stripify(gen):
>>     for keyed in gen:
>>         yield keyed.obj
>> 
>> merged = stripify(merge(keyify(A), keyify(B), keyify(C))) #A,B,C being
>> the iterables
> 
> Ah, that's not a bad idea.  I think it could be simplified by letting
> Python do the comparison work as follows (also untested).
> 
> def keyify(gen, key=lamda x:x):
>     for item in gen:
>         yield (key(item), item)
> 
> def stripify(gen):
>     for item in gen:
>         yield item[1]

This is not as general. It makes sorting unstable and can even fail if the 
items are unorderable:

>>> def decorate(gen, key):
...     for item in gen:
...             yield key(item), item
...
>>> def undecorate(gen):
...     for item in gen:
...             yield item[-1]
...
>>> sorted(decorate([1j, -1j, 1+1j], key=lambda c: c.real))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: no ordering relation is defined for complex numbers

One way to fix it:

>>> def decorate(gen, key):
...     for index, item in enumerate(gen):
...             yield key(item), index, item
...
>>> sorted(decorate([1j, -1j, 1+1j], key=lambda c: c.real))
[(0.0, 0, 1j), (0.0, 1, -1j), (1.0, 2, (1+1j))]
>>> list(undecorate(_))
[1j, -1j, (1+1j)]

Peter



From bvdmyrby at jyxk16274849.net  Sat May  9 04:30:46 2009
From: bvdmyrby at jyxk16274849.net (Raoul Gough)
Date: Sat, 09 May 2009 09:30:46 +0100
Subject: MacPython 3.0.1 installation problem, no /usr/local/bin/python*
Message-ID: <m2vdoad6fd.fsf@yahoo.co.uk>

I just installed MacPython 3.0.1 (woot!) but the installer didn't seem
to do an absolutely complete job. According to the ReadMe.txt, "The
installer puts [...] command-line tools in /usr/local/bin [...]". This
didn't happen - even after the install reported Success, there were no
python files or symlinks under /usr/local/bin.

Also, I'm guessing there should have been a symlink to the current
version under /Library/Frameworks/Python.framework/Versions, which
wasn't there either:

$ cd /Library/Frameworks/Python.framework
$ ls -l Python
lrwxr-xr-x  1 root  admin  23 May  9 08:34 Python -> Versions/Current/Python
$ ls -l Versions/Current
ls: Versions/Current: No such file or directory

So I fixed this all up as follows:

$ cd /Library/Frameworks/Python.framework/Versions
$ sudo ln -s 3.0 Current
$ cd /usr/local/bin
$ sudo ln -s $(find /Library/Frameworks/Python.framework/Versions/Current/bin -type f) .

So did something go wrong with the installer, or is it all supposed to
work somehow differently?

-- 
Raoul Gough.


From george.sakkis at gmail.com  Sat May  9 04:37:32 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Sat, 9 May 2009 01:37:32 -0700 (PDT)
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
Message-ID: <b3b6788c-42ad-4c65-b999-48f420e90630@o20g2000vbh.googlegroups.com>

On May 8, 11:33 am, Mikael Olofsson <mik... at isy.liu.se> wrote:

> Hi all!
>
> I have long tried to avoid decorators, but now I find myself in a
> situation where I think they can help. I seem to be able to decorate
> functions, but I fail miserably when trying to decorate methods. The
> information I have been able to find on-line focuses on decorating
> functions, and do not mention any special problem regarding methods.
>
> Consider the following example. I start by defining a simple decorator:
>
>  >>> class test_decorator(object):
> ...     def __init__(self,func):
> ...         self._func = func
> ...     def __call__(self, *args):
> ...         print 'Decorator:', args
> ...         self._func(*args)
>
> Then I decorate a function:
>
>  >>> @test_decorator
> ... def func(*args):
> ...     print 'Function: ', args
>
> Let's try that:
>
>  >>> func(1,2,3)
> Decorator: (1, 2, 3)
> Function:  (1, 2, 3)
>
> OK! That was what I expected. Let's decorate a method:
>
>  >>> class cls(object):
> ...     @test_decorator
> ...     def meth(self,*args):
> ...         print 'Method:   ', args
>
> Then try that:
>
>  >>> cls().meth(1,2,3)
> Decorator: (1, 2, 3)
> Method:    (2, 3)
>
> Oops! That's weird. I had expected - or at least wanted - the same
> result as for the function above.
>
> Where did the first argument go? If it was sent to the original method
> meth as the real first argument (self), then why did I not get an exception?
>
> More importantly: How do I write a decorator that does not drop arguments?
>
> I guess it all has to do with the fact that the returned callable isn't
> a method of cls. Is it possible to write a decorator that returns a
> callable that is a method of cls, when used on methods in cls?

Yes, just return an actual function from the decorator instead of a
callable object:

def test_decorator2(func):
    def wrapper(*args):
        print 'Decorator2:', args
        func(*args)
    return wrapper


class cls(object):
    @test_decorator
    def meth(self,*args):
        print 'Method:   ', args

    @test_decorator2
    def meth2(self,*args):
        print 'Method2:   ', args

>>> cls.meth
<__main__.test_decorator object at 0x87663cc>

>>> cls.meth2
<unbound method cls.wrapper>

>>> cls().meth2(1,2,3)
Decorator2: (<__main__.cls object at 0x8766ecc>, 1, 2, 3)
Method2:    (1, 2, 3)

The reason this works is that functions are already descriptors, so
you don't have to explicitly define __get__() as you would for a new
callable class (see Peter's example).

HTH,
George


From tuomas.vesterinen at iki.fi  Sat May  9 04:57:48 2009
From: tuomas.vesterinen at iki.fi (Tuomas Vesterinen)
Date: Sat, 09 May 2009 11:57:48 +0300
Subject: Problems with datetime.datetime.strptime
Message-ID: <4a05458d$0$24784$9b536df3@news.fv.fi>

I hoped that I could get rid of my special module _strptime2 when 
porting to Python 3.0. But testing is a disappointment.

Python 3.0.1 (r301:69556, Apr 14 2009, 14:30:31)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import locale, datetime
 >>> def test1(locale_str, val):
...     print(locale.setlocale(locale.LC_ALL, locale_str), ':')
...     test_cases = [
...         locale.nl_langinfo(locale.D_T_FMT), # test default formats
...         locale.nl_langinfo(locale.D_FMT),
...         locale.nl_langinfo(locale.T_FMT)
...     ]
...     for form in test_cases:
...         string = val.strftime(form)
...         print("  strftime(%s)=%s" % (repr(form), repr(string)))
...         print("  strptime(%s,%s)=" % (repr(string), repr(form)), 
end=' ')
...         try:
...             val2 = datetime.datetime.strptime(string, form)
...         except ValueError as e:
...             print('\n   ', str(e))
...         else:
...             print('\n   ', str(val2))
...
 >>> now = datetime.datetime.now()
 >>> for loc in ('C', 'en_US.UTF-8', 'fi_FI.UTF-8'):
...     test1(loc, now)
...
C :
   strftime('%a %b %e %H:%M:%S %Y')='Sat May  9 11:26:12 2009'
   strptime('Sat May  9 11:26:12 2009','%a %b %e %H:%M:%S %Y')=
     'e' is a bad directive in format '%a %b %e %H:%M:%S %Y'
   strftime('%m/%d/%y')='05/09/09'
   strptime('05/09/09','%m/%d/%y')=
     2009-05-09 00:00:00
   strftime('%H:%M:%S')='11:26:12'
   strptime('11:26:12','%H:%M:%S')=
     1900-01-01 11:26:12
en_US.UTF-8 :
   strftime('%a %d %b %Y %r %Z')='Sat 09 May 2009 11:26:12 AM '
   strptime('Sat 09 May 2009 11:26:12 AM ','%a %d %b %Y %r %Z')=
     'r' is a bad directive in format '%a %d %b %Y %r %Z'
   strftime('%m/%d/%Y')='05/09/2009'
   strptime('05/09/2009','%m/%d/%Y')=
     2009-05-09 00:00:00
   strftime('%r')='11:26:12 AM'
   strptime('11:26:12 AM','%r')=
     'r' is a bad directive in format '%r'
fi_FI.UTF-8 :
   strftime('%a %e. %Bta %Y %T')='la  9. toukokuuta 2009 11:26:12'
   strptime('la  9. toukokuuta 2009 11:26:12','%a %e. %Bta %Y %T')=
     'e' is a bad directive in format '%a %e. %Bta %Y %T'
   strftime('%d.%m.%Y')='09.05.2009'
   strptime('09.05.2009','%d.%m.%Y')=
     2009-05-09 00:00:00
   strftime('%T')='11:26:12'
   strptime('11:26:12','%T')=
     'T' is a bad directive in format '%T'

What to do.
Tuomas Vesterinen


From ggardiner at iee.org  Sat May  9 05:01:44 2009
From: ggardiner at iee.org (Geoff Gardiner)
Date: Sat, 09 May 2009 10:01:44 +0100
Subject: How do I test the integrity of a Python installation in Debian
	and	Ubuntu
In-Reply-To: <gu1pa8$4mj$1@panix3.panix.com>
References: <mailman.5282.1241783298.11746.python-list@python.org>
	<gu1pa8$4mj$1@panix3.panix.com>
Message-ID: <4A054678.40503@iee.org>

Aahz wrote:
> How important is the apt-get requirement?  

That's a significant point, thank you. Two parts to the response:

a) I don't feel that I am sufficiently expert to launch into compilation
of Python if I can avoid it.

b) I hope that I can put all platform risk into the lap of the hosting
provider, and apt-get is probably the only delivery mechanism they will
take any responsibility for. (I want to use their 'standard'.)

All the best,
Geoff




From chris at simplistix.co.uk  Sat May  9 05:06:52 2009
From: chris at simplistix.co.uk (Chris Withers)
Date: Sat, 09 May 2009 10:06:52 +0100
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <49FB3384.1030106@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB2398.5000708@simplistix.co.uk> <49FB261F.9080306@v.loewis.de>
	<49FB2A2A.4090606@simplistix.co.uk> <49FB3384.1030106@v.loewis.de>
Message-ID: <4A0547AC.7060103@simplistix.co.uk>

Martin v. L?wis wrote:
> Ok, so create three tar files:
> 
> 1. base.tar, containing
> 
>    simplistix/
>    simplistix/__init__.py

So this __init__.py can have code in it? And base.tar can have other 
modules and subpackages in it?
What happens if the base and an addon both define a package called 
simplistix.somepackage?

> 2. addon1.tar, containing
> 
>    simplistix/addon1.pth (containing a single "*")

What does that * mean? I thought .pth files just had python in them?

> Unpack each of them anywhere on sys.path, in any order.

How would this work if base, addon1 and addon2 were eggs managed by 
buildout or setuptools?

cheers,

Chris

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk


From martin at v.loewis.de  Sat May  9 05:27:22 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 09 May 2009 11:27:22 +0200
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <4A0547AC.7060103@simplistix.co.uk>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>	<49FB2398.5000708@simplistix.co.uk>
	<49FB261F.9080306@v.loewis.de>	<49FB2A2A.4090606@simplistix.co.uk>
	<49FB3384.1030106@v.loewis.de> <4A0547AC.7060103@simplistix.co.uk>
Message-ID: <4A054C7A.8020806@v.loewis.de>

>> Ok, so create three tar files:
>>
>> 1. base.tar, containing
>>
>>    simplistix/
>>    simplistix/__init__.py
> 
> So this __init__.py can have code in it? 

That's the point, yes.

> And base.tar can have other modules and subpackages in it?

Certainly, yes.

> What happens if the base and an addon both define a package called
> simplistix.somepackage?

Depends on whether simplistix.somepackage is a namespace package
(it should). If so, they get merged just as any other namespace
package.

>> 2. addon1.tar, containing
>>
>>    simplistix/addon1.pth (containing a single "*")
> 
> What does that * mean?

See PEP 382 (search for "*").

> I thought .pth files just had python in them?

Not at all - they never did. They have paths in them.

>> Unpack each of them anywhere on sys.path, in any order.
> 
> How would this work if base, addon1 and addon2 were eggs managed by
> buildout or setuptools?

What is a managed egg (i.e. what kind of management does buildout
or setuptools apply to it)?

Regards,
Martin


From nick at craig-wood.com  Sat May  9 05:30:06 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sat, 09 May 2009 04:30:06 -0500
Subject: ANN: Python process utility (psutil) 0.1.2 released
References: <65f15b53-aacf-4651-a113-960cce25f205@p4g2000vba.googlegroups.com>
Message-ID: <slrnh0ah9f.mk1.nick@irishsea.home.craig-wood.com>

Giampaolo Rodola' <gnewsg at gmail.com> wrote:
>  psutil is a module providing an interface for retrieving information
>  on running processes and system utilization (CPU, memory) in a
>  portable way by using Python, implementing many functionalities
>  offered by tools like ps, top and Windows task manager.
>  It currently supports Linux, OS X, FreeBSD and Windows.

Very nice!

Maybe you should make

  Process()

mean

  Process(os.getpid())

as I often want ask how much memory/cpu is my process using but rarely
want to ask about other processes?

It would be nice if "pydoc psutil" returned something useful also!
You could do this by replacing your current __init__.py (which just
contains "from _psutil import *") with _psutil.py

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From Florian.Wollenschein at FernUni-Hagen.de  Sat May  9 05:41:25 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Sat, 09 May 2009 11:41:25 +0200
Subject: Code - what could be done better?
Message-ID: <gu3j48$cig$1@news-cedar.fernuni-hagen.de>

Hi all,

here's the main code of thc, my txt to html converter. Since I'm a 
beginner it is far, far, faaaaaaar away from perfect or even good :-)
What could be done better?

====================================================================================
#!/usr/bin/env python
# -*- coding: utf-8 -*-

# thc
# Copyright (C) 2007 - 2009 Listick Lorch
#
# <info at listick.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 
02110-1301 USA

import sys
import webbrowser
import texts_en as texts # you have to change only the countrycode like 
texts_de ...
from PyQt4 import QtGui, QtCore
from mainframe_ui import Ui_MainWindow as Frm
import abtDialogFrame

class ThcMainframe(QtGui.QMainWindow, Frm):
     def __init__(self):
         QtGui.QMainWindow.__init__(self)
         self.setupUi(self)

         # ---MEMBERS---
         self.file_to_convert     = ''
         self.file_to_write       = ''
         self.txt_file_to_convert = '' # stores the text of the .txt file
         self.bgColor_R = hex(255)[2:].zfill(2)
         self.bgColor_G = hex(255)[2:].zfill(2)
         self.bgColor_B = hex(255)[2:].zfill(2)
         self.font_size   = 0

         # ---SLOTS---
         # browse file to convert
         self.connect(self.btnBrowseFileConv,
                 QtCore.SIGNAL("clicked()"), self.onBrowseFileConv)
         # browse file to write
         self.connect(self.btnBrowseFileWrite,
                 QtCore.SIGNAL("clicked()"), self.onBrowseFileWrite)
         # convert
         self.connect(self.btnConvert,
                 QtCore.SIGNAL("clicked()"), self.onConvert)
         # show result
         self.connect(self.btnShowResult,
                 QtCore.SIGNAL("clicked()"), self.onShowResult)
         # select color
         self.connect(self.btnColorSelect,
                 QtCore.SIGNAL("clicked()"), self.SelectColor)
         # font size
         self.connect(self.horizontalSlider,
                 QtCore.SIGNAL("changed()"), self.onFontSizeChanged)
         # help menu
         self.connect(self.actionGo_to_listick_org,
                 QtCore.SIGNAL("triggered()"), self.GoToListickOrg)

         self.connect(self.actionAbout,
                 QtCore.SIGNAL("triggered()"), self.OpenAbout)
         # quit
         self.connect(self.btnQuit,
                 QtCore.SIGNAL("clicked()"), self.onQuit)

         self.connect(self.actionExit,
                 QtCore.SIGNAL("triggered()"), self.onQuit)

     def onBrowseFileConv(self):
         self.file_to_convert = QtGui.QFileDialog.getOpenFileName(self, 
texts.FileMenuOpen, '/home', '*.txt')
         self.inpFileConv.setText(self.file_to_convert)

     def onBrowseFileWrite(self):
         self.file_to_write = QtGui.QFileDialog.getSaveFileName(self, 
texts.FileMenuSaveAs, '/home', '*.htm*')
         self.inpFileWrite.setText(self.file_to_write)

     def onConvert(self):
         # read the title
         html_file_title = str(self.inpTitle.displayText())
         # read the txt
         file_open = open(self.file_to_convert)
         print texts.FileOpened
         self.txtOutput.insertPlainText(texts.FileOpened)
         self.txt_file_to_convert = file_open.read()
         file_open.close()
         print texts.FileClosed
         self.txtOutput.insertPlainText(texts.FileClosed)

         # write html
         file_open = open(self.file_to_write, "w")
         print texts.WritingFile
         self.txtOutput.insertPlainText(texts.WritingFile)
         strict_or_transitional = {True: 'Transitional', False: 'Strict'}
         spec = strict_or_transitional[self.rdioBtnTransitional.isChecked()]
         doctype = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 
%s//EN">\n' % spec
         file_open.write(doctype)
         file_open.write('<HTML>\n')
         # HTML head stuff
         file_open.write('<HEAD>\n')
         file_open.write('<META HTTP-EQUIV="Content-Type" 
CONTENT="text/html; charset=UTF-8">\n')
         file_open.write('<TITLE>%s</TITLE>\n' % html_file_title)
         file_open.write('<META NAME="Generator" CONTENT="thc - 
Txt-to-Html-Converter %s">\n' %  texts.versionInfo)
         file_open.write('</HEAD>\n')
         #head end

         #HTML body
         file_open.write('<BODY BGCOLOR="#%s%s%s">\n' % (self.bgColor_R, 
self.bgColor_G, self.bgColor_B))
         file_open.write(self.txt_file_to_convert)
         file_open.write('<BR>')

         # Created-with-thc notice
         file_open.write(texts.createdWithNote)
         file_open.write('</BODY>\n')
         #body end
         file_open.write('</HTML>')

         file_open.close()
         print texts.FileWritten
         self.txtOutput.insertPlainText(texts.FileWritten)
         self.txtOutput.insertPlainText(texts.Success)

     def onShowResult(self):
         webbrowser.open_new(self.file_to_write)

     def SelectColor(self):
         color = QtGui.QColorDialog.getColor()
         self.bgColor_R  = hex(color.red())[2:].zfill(2)
         self.bgColor_G  = hex(color.green())[2:].zfill(2)
         self.bgColor_B  = hex(color.blue())[2:].zfill(2)
         self.txtOutput.insertPlainText("\nSelected color (RGB Hex): 
%s%s%s" % (self.bgColor_R,  self.bgColor_G,  self.bgColor_B))

     def onFontSizeChanged(self):
         self.font_size = horizontalSlider.value()
         self.txtOutput.insertPlainText("font size: %s" % self.font_size)

     def OpenAbout(self):
         abtDialog = abtDialogFrame.ThcAboutDialog()
         abtDialog.setAttribute(QtCore.Qt.WA_DeleteOnClose)
         abtDialog.exec_()

     def GoToListickOrg(self):
         webbrowser.open_new('http://www.listick.org')

     def onQuit(self):
         print texts.Quit
         self.close()

app = QtGui.QApplication(sys.argv)
mainframe = ThcMainframe()
mainframe.show()
sys.exit(app.exec_())
========================================================================================

Thanks in advance.

Listick
http://www.listick.org


From wzab01 at gmail.com  Sat May  9 07:54:50 2009
From: wzab01 at gmail.com (wzab)
Date: Sat, 9 May 2009 04:54:50 -0700 (PDT)
Subject: IIR filter conversion routines for Python?
References: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>
	<mailman.5267.1241760908.11746.python-list@python.org>
Message-ID: <28232dc7-d7d2-4cec-a48e-a0144efa1a5b@v17g2000vbb.googlegroups.com>

On May 8, 7:30?am, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> On Wed, 6 May 2009 11:03:57 -0700 (PDT), wzab <wza... at gmail.com>
> declaimed the following in gmane.comp.python.general:
>
> > Hi,
> > I'm looking for procedures converting theIIRfilters into cascade and/
> > or parallel forms. Something like dir2cas.m or dir2par.m known in the
> > Matlab/Octave world.
> > Unfortunately SciPy does not contain such functions.
>
> ? ? ? ? Well... If they are Matlab scripts (as the .m seems to imply),
> couldn't one just take the source and recode them in SciPy terms.
> --
> ? ? ? ? Wulfraed ? ? ? ?Dennis Lee Bieber ? ? ? ? ? ? ? KD6MOG
> ? ? ? ? wlfr... at ix.netcom.com ? ? ? ? ? ? ? wulfr... at bestiaria.com
> ? ? ? ? ? ? ? ? HTTP://wlfraed.home.netcom.com/
> ? ? ? ? (Bestiaria Support Staff: ? ? ? ? ? ? ? web-a... at bestiaria.com)
> ? ? ? ? ? ? ? ? HTTP://www.bestiaria.com/

Unfortunately the Matlab scripts that are floating around the net  do
not contain the license information.
(e.g. takasila.coe.psu.ac.th/~s4810685/DSP/proakis/PWS_DSP/dir2cas.m )
So I don't know if it sufficient to consider the "public domain"...
Additionally Python is simply different and allows some thing to do in
different (better?) way.
In fact I have almost finished the simple dir2cas.py converter.
I'll post the source as soon, as it is ready.
--
Regards,
WZab



From piet at cs.uu.nl  Sat May  9 08:01:51 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 09 May 2009 14:01:51 +0200
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
Message-ID: <m27i0qiixc.fsf@cs.uu.nl>

>>>>> "anuraguniyal at yahoo.com" <anuraguniyal at yahoo.com> (ac) a ?crit:

>ac> also not sure why (python 2.5)
>ac> print a # works
>ac> print unicode(a) # works
>ac> print [a] # works
>ac> print unicode([a]) # doesn't works

Which code do you use now?

And what does this print?

import sys
print sys.stdout.encoding
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From piet at cs.uu.nl  Sat May  9 08:21:31 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 09 May 2009 14:21:31 +0200
Subject: ANN: Python process utility (psutil) 0.1.2 released
References: <65f15b53-aacf-4651-a113-960cce25f205@p4g2000vba.googlegroups.com>
Message-ID: <m23abeii0k.fsf@cs.uu.nl>

>>>>> "Giampaolo Rodola'" <gnewsg at gmail.com> (GR) wrote:

>GR> Hi,
>GR> I'm pleased to announce the 0.1.2 release of psutil:
>GR> http://code.google.com/p/psutil

Very nice. I was just contemplating writing some python code to get
information from ps (actually virtual memory size of the process) when
your announcement came along. Fortunately I had not yet started writing
the code :=)
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From wzab01 at gmail.com  Sat May  9 09:34:18 2009
From: wzab01 at gmail.com (wzab)
Date: Sat, 9 May 2009 06:34:18 -0700 (PDT)
Subject: IIR filter conversion routines for Python?
References: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>
	<mailman.5267.1241760908.11746.python-list@python.org>
	<28232dc7-d7d2-4cec-a48e-a0144efa1a5b@v17g2000vbb.googlegroups.com>
Message-ID: <2a7b69f5-9059-4eb0-a1ad-c6c58c98b4dd@t11g2000vbc.googlegroups.com>

> In fact I have almost finished the simple dir2cas.py converter.
> I'll post the source as soon, as it is ready.

OK. So here it is as public domain code. Any hints and suggestions
of improvements are appreciated.

http://groups.google.com/group/alt.sources/browse_thread/thread/924fbe2255f8c42d

--
Regards, WZab


From zookog at gmail.com  Sat May  9 09:49:13 2009
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Sat, 9 May 2009 07:49:13 -0600
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <49FB22B5.3040507@simplistix.co.uk>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
Message-ID: <cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>

.pth files are why I can't easily use GNU stow with easy_install.
If installing a Python package involved writing new files into the
filesystem, but did not require reading, updating, and re-writing any
extant files such as .pth files, then GNU stow would Just Work with
easy_install the way it Just Works with most things.

Regards,

Zooko


From chris at simplistix.co.uk  Sat May  9 10:10:23 2009
From: chris at simplistix.co.uk (Chris Withers)
Date: Sat, 09 May 2009 15:10:23 +0100
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <4A054C7A.8020806@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>	<49FB2398.5000708@simplistix.co.uk>
	<49FB261F.9080306@v.loewis.de>	<49FB2A2A.4090606@simplistix.co.uk>
	<49FB3384.1030106@v.loewis.de> <4A0547AC.7060103@simplistix.co.uk>
	<4A054C7A.8020806@v.loewis.de>
Message-ID: <4A058ECF.6050203@simplistix.co.uk>

Martin v. L?wis wrote:
>> So this __init__.py can have code in it? 
> 
> That's the point, yes.
> 
>> And base.tar can have other modules and subpackages in it?
> 
> Certainly, yes.

Great, when is the PEP due to land in 2.x? ;-)

>> What happens if the base and an addon both define a package called
>> simplistix.somepackage?
> 
> Depends on whether simplistix.somepackage is a namespace package
> (it should). If so, they get merged just as any other namespace
> package.

Sorry, I was looking at potential bug cases here. What happens if it's 
not a namespace package?

> See PEP 382 (search for "*").
> 
>> I thought .pth files just had python in them?
> 
> Not at all - they never did. They have paths in them.

I've certainly seen them with python in, and that's what I hate about 
them...

>>> Unpack each of them anywhere on sys.path, in any order.
>> How would this work if base, addon1 and addon2 were eggs managed by
>> buildout or setuptools?
> 
> What is a managed egg (i.e. what kind of management does buildout
> or setuptools apply to it)?

Sorry, bad wording on my part... I guess I meant more how would 
buildout/setuptools go about installing/uninstalling/etc packages 
thatconform to PEP 382? Would setuptools/buildout need modification or 
would the changes take effect lower down in the stack?

cheers,

Chris

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk


From deets at nospam.web.de  Sat May  9 10:13:20 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 09 May 2009 16:13:20 +0200
Subject: Creating temperory files for a web application
In-Reply-To: <275bb932-644b-4f64-80e8-7061ec7b2dff@a5g2000pre.googlegroups.com>
References: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>
	<76ideeF1d1gbsU1@mid.uni-berlin.de>
	<354db318-25b3-4af1-8fb1-cd86a0695637@x31g2000prc.googlegroups.com>
	<275bb932-644b-4f64-80e8-7061ec7b2dff@a5g2000pre.googlegroups.com>
Message-ID: <76lhc0F1diso3U1@mid.uni-berlin.de>

> 
> Hi Diez,
>    I think I understood your point now.
>    Is it ?
>    (1) Have a separate URL for the image - update urls.py for that
>    (2) Pass all the GET parameters to that URL again.
>    (3) Recalculate the fields again in that URL
>    (4) Create the image and send back as image/png based on the
> received fields.
>    Other than the fact that I will be hitting the DB twice - for the
> fields in the original URL and for creating Image in the second URL, I
> think this is the best option.
>    Please let me know whether I have understood correctly.
> 
>    The same option can be done for CSV and PDF files too. Thank you
> very much Diez.

Yep, that's what I meant.

Diez


From deets at nospam.web.de  Sat May  9 10:14:17 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 09 May 2009 16:14:17 +0200
Subject: php to python code converter
In-Reply-To: <mailman.5306.1241805879.11746.python-list@python.org>
References: <4A044D71.1000500@gmail.com>	<20090508113720.06d4a48e.darcy@druid.net>	<mailman.5298.1241800394.11746.python-list@python.org>	<76j97fF1crfkoU2@mid.uni-berlin.de>
	<mailman.5306.1241805879.11746.python-list@python.org>
Message-ID: <76lhdpF1diso3U2@mid.uni-berlin.de>

Dotan Cohen schrieb:
>> I'm almost 100% sure it won't. The code is machine-generated, thus not easy
>> to the human eye, not idiomatic so you don't learn how to write good python
>> through it. You learn how to jump through hoops to code the same way in
>> python that you do in PHP.
>>
> 
> I meant for single functions, not for translating entire apps.

No difference. Either the functions are trivial, or they become 
non-idiomatic.

Diez



From martin at v.loewis.de  Sat May  9 10:18:44 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 09 May 2009 16:18:44 +0200
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
References: <49D4DA72.60401@v.loewis.de>	
	<20090407174355.B62983A4063@sparrow.telecommunity.com>	
	<49E4A58F.70309@egenix.com>	
	<20090414162603.70C843A4100@sparrow.telecommunity.com>	
	<49E4F93B.6010802@egenix.com>	
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	
	<49E59202.6050809@egenix.com>	
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
Message-ID: <4A0590C4.1020904@v.loewis.de>

Zooko O'Whielacronx wrote:
> .pth files are why I can't easily use GNU stow with easy_install.
> If installing a Python package involved writing new files into the
> filesystem, but did not require reading, updating, and re-writing any
> extant files such as .pth files, then GNU stow would Just Work with
> easy_install the way it Just Works with most things.

Please understand that this is the fault of easy_install, not of .pth
files. There is no technical need for easy_install to rewrite .pth
files on installation. It could just as well have created new .pth
files, rather than modifying existing ones.

If you always use --single-version-externally-managed with easy_install,
it will stop editing .pth files on installation.

Regards,
Martin



From Scott.Daniels at Acm.Org  Sat May  9 10:19:45 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 07:19:45 -0700
Subject: Wrapping comments
In-Reply-To: <towb-EA7906.14423909052009@news.individual.de>
References: <towb-EA7906.14423909052009@news.individual.de>
Message-ID: <K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>

Tobias Weber wrote:
> the guideline (PEP 8) is hard wrap to 7x characters. The reason given is 
> that soft wrap makes code illegible.
> 
> So what if you hard wrap code but let comments and docstrings soft-wrap?
You apparently have caught the soft-/hard- disease spread by several
software retailers.  There are no such characters as "hard break,"
"soft break,"  "hard space,"  and "soft space."  Check you ASCII or
Unicode standards if you disagree.  There is a "non-breaking space"
in Unicode, but it doesn't mean what you mean.

If you cannot fix everyone else's editors, print drivers, and display
software to have a "soft wrap" that suits their style, then you are
asking others to bend their workflow to suit your style.  This rule
is not to make the writing or altering of code easier; it is about
making the _reading_ of code easier.  Think of it as a "treaty
point," like the "no tabs" rule -- violating it works fine for any
individual, but following it eases cooperative work.

> ... Or are there editors that can do a "soft hard wrap" while
> keeping  indentation and #comment markers intact?
At least vim and emacs can do so.  Some other editors redefine
standards in order to make their work easier.

--Scott David Daniels
Scott.Daniels at Acm.Org



From martin at v.loewis.de  Sat May  9 10:32:39 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 09 May 2009 16:32:39 +0200
Subject: [Python-Dev] PEP 382: little help for stupid people?
In-Reply-To: <4A058ECF.6050203@simplistix.co.uk>
References: <49D4DA72.60401@v.loewis.de>	<49D52115.6020001@egenix.com>	<49D66C6E.3090602@v.loewis.de>	<49DB475B.8060504@egenix.com>	<20090407140317.EBD383A4063@sparrow.telecommunity.com>	<49DB6A1F.50801@egenix.com>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>	<49FB2398.5000708@simplistix.co.uk>
	<49FB261F.9080306@v.loewis.de>	<49FB2A2A.4090606@simplistix.co.uk>
	<49FB3384.1030106@v.loewis.de> <4A0547AC.7060103@simplistix.co.uk>
	<4A054C7A.8020806@v.loewis.de> <4A058ECF.6050203@simplistix.co.uk>
Message-ID: <4A059407.2060803@v.loewis.de>

Chris Withers wrote:
> Martin v. L?wis wrote:
>>> So this __init__.py can have code in it? 
>>
>> That's the point, yes.
>>
>>> And base.tar can have other modules and subpackages in it?
>>
>> Certainly, yes.
> 
> Great, when is the PEP due to land in 2.x? ;-)

Most likely, never - it probably will be implemented only after
the last feature release of 2.x was made.

>>> What happens if the base and an addon both define a package called
>>> simplistix.somepackage?
>>
>> Depends on whether simplistix.somepackage is a namespace package
>> (it should). If so, they get merged just as any other namespace
>> package.
> 
> Sorry, I was looking at potential bug cases here. What happens if it's
> not a namespace package?

Then it will be imported as a regular child package.

>>>> Unpack each of them anywhere on sys.path, in any order.
>>> How would this work if base, addon1 and addon2 were eggs managed by
>>> buildout or setuptools?
>>
>> What is a managed egg (i.e. what kind of management does buildout
>> or setuptools apply to it)?
> 
> Sorry, bad wording on my part... I guess I meant more how would
> buildout/setuptools go about installing/uninstalling/etc packages
> thatconform to PEP 382? Would setuptools/buildout need modification or
> would the changes take effect lower down in the stack?

Unfortunately, I don't know precisely what they do, so I don't know
whether any of it needs modification.

All I can say is that if they want to install namespace packages
using the mechanism of PEP 382, they will have to produce the file
layout specified in the PEP.

For distutils (which is the only library in that area that I do know),
I think just installing any .pth files inside a package would be
sufficient.

Regards,
Martin


From benjamin.kaplan at case.edu  Sat May  9 10:35:42 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 9 May 2009 10:35:42 -0400
Subject: MacPython 3.0.1 installation problem, no /usr/local/bin/python*
In-Reply-To: <m2vdoad6fd.fsf@yahoo.co.uk>
References: <m2vdoad6fd.fsf@yahoo.co.uk>
Message-ID: <ec96e1390905090735p40bd6c21w5606c521c4c161e5@mail.gmail.com>

On Sat, May 9, 2009 at 4:30 AM, Raoul Gough <bvdmyrby at jyxk16274849.net>wrote:

> I just installed MacPython 3.0.1 (woot!) but the installer didn't seem
> to do an absolutely complete job. According to the ReadMe.txt, "The
> installer puts [...] command-line tools in /usr/local/bin [...]". This
> didn't happen - even after the install reported Success, there were no
> python files or symlinks under /usr/local/bin.
>
> Also, I'm guessing there should have been a symlink to the current
> version under /Library/Frameworks/Python.framework/Versions, which
> wasn't there either:
>
> $ cd /Library/Frameworks/Python.framework
> $ ls -l Python
> lrwxr-xr-x  1 root  admin  23 May  9 08:34 Python ->
> Versions/Current/Python
> $ ls -l Versions/Current
> ls: Versions/Current: No such file or directory
>
> So I fixed this all up as follows:
>
> $ cd /Library/Frameworks/Python.framework/Versions
> $ sudo ln -s 3.0 Current
> $ cd /usr/local/bin
> $ sudo ln -s $(find
> /Library/Frameworks/Python.framework/Versions/Current/bin -type f) .
>
> So did something go wrong with the installer, or is it all supposed to
> work somehow differently?
>

Because Python 3 breaks compatibility with Python 2, the installers don't
install it as the default. The executable should be at
/usr/local/bin/python3.0



>
> --
> Raoul Gough.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From pje at telecommunity.com  Sat May  9 10:41:02 2009
From: pje at telecommunity.com (P.J. Eby)
Date: Sat, 09 May 2009 10:41:02 -0400
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <4A0590C4.1020904@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
Message-ID: <20090509143829.17F293A4080@sparrow.telecommunity.com>

At 04:18 PM 5/9/2009 +0200, Martin v. L??wis wrote:
>Zooko O'Whielacronx wrote:
> > .pth files are why I can't easily use GNU stow with easy_install.
> > If installing a Python package involved writing new files into the
> > filesystem, but did not require reading, updating, and re-writing any
> > extant files such as .pth files, then GNU stow would Just Work with
> > easy_install the way it Just Works with most things.
>
>Please understand that this is the fault of easy_install, not of .pth
>files. There is no technical need for easy_install to rewrite .pth
>files on installation. It could just as well have created new .pth
>files, rather than modifying existing ones.
>
>If you always use --single-version-externally-managed with easy_install,
>it will stop editing .pth files on installation.

It's --multi-version (-m) that does 
that.  --single-version-externally-managed is a "setup.py install" option.

Both have the effect of not editing .pth files, but they do so in 
different ways.  The "setup.py install" option causes it to install 
in a distutils-compatible layout, whereas --multi-version simply 
drops .egg files or directories in the target location and leaves it 
to the user (or the generated script wrappers) to add them to sys.path.



From martin at v.loewis.de  Sat May  9 10:42:01 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 09 May 2009 16:42:01 +0200
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <20090509143829.17F293A4080@sparrow.telecommunity.com>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
Message-ID: <4A059639.7040505@v.loewis.de>

>> If you always use --single-version-externally-managed with easy_install,
>> it will stop editing .pth files on installation.
> 
> It's --multi-version (-m) that does that. 
> --single-version-externally-managed is a "setup.py install" option.
> 
> Both have the effect of not editing .pth files, but they do so in
> different ways.  The "setup.py install" option causes it to install in a
> distutils-compatible layout, whereas --multi-version simply drops .egg
> files or directories in the target location and leaves it to the user
> (or the generated script wrappers) to add them to sys.path.

Ah, ok. Is there also an easy_install invocation that unpacks the zip
file into some location of sys.path (which then wouldn't require
editing sys.path)?

Regards,
Martin


From ben+python at benfinney.id.au  Sat May  9 11:00:51 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 10 May 2009 01:00:51 +1000
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
Message-ID: <87zldmcod8.fsf@benfinney.id.au>

Tobias Weber <towb at gmx.net> writes:

> Or are there editors that can do a "soft hard wrap" while keeping 
> indentation and #comment markers intact?

Yes. Both Emacs and Vim will do exactly this when re-wrapping a
paragraph of commented lines, provided they have support for the
language's comment syntax (which, for Python, they do).

-- 
 \                            ?Only the educated are free.? ?Epictetus |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From cdalten at gmail.com  Sat May  9 11:20:12 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sat, 9 May 2009 08:20:12 -0700 (PDT)
Subject: Thread locking question.
Message-ID: <30763887-0b49-47c7-b4c2-76892024b36a@d38g2000prn.googlegroups.com>

The following code gets data from 5 different websites at the "same
time".

#!/usr/bin/python

import Queue
import threading
import urllib2
import time

hosts = ["http://yahoo.com", "http://google.com", "http://amazon.com",
         "http://ibm.com", "http://apple.com"]

queue = Queue.Queue()

class MyUrl(threading.Thread):
    def __init__(self, queue):
        threading.Thread.__init__(self)
        self.queue = queue

    def run(self):
        while True:
            host = self.queue.get()
            if host is None:
                break
            url = urllib2.urlopen(host)
            print url.read(1024)
            #self.queue.task_done()

start = time.time()

def main():
    for i in range(5):
        t = MyUrl(queue)
        t.setDaemon(True)
        t.start()

    for host in hosts:
        print "pushing", host
        queue.put(host)

    for i in range(5):
        queue.put(None)

    t.join()

if __name__ == "__main__":
    main()
    print "Elapsed Time: %s" % (time.time() - start)


How does the parallel download work if each thread has a lock? When
the program opens www.yahoo.com, it places a lock on the thread,
right? If so, then doesn't that mean the other 4 sites have to wait
for the thread to release the lock?


From jcd at sdf.lonestar.org  Sat May  9 11:26:53 2009
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Sat, 09 May 2009 11:26:53 -0400
Subject: unicode bit me
In-Reply-To: <977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
Message-ID: <1241882813.17260.0.camel@mctell>

You're still not asking questions in a way that we can answer them.

Define "Doesn't work."  Define "a".


On Sat, 2009-05-09 at 00:04 -0700, anuraguniyal at yahoo.com wrote:
> also not sure why (python 2.5)
> print a # works
> print unicode(a) # works
> print [a] # works
> print unicode([a]) # doesn't works
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From ebonak at hotmail.com  Sat May  9 11:30:02 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 09 May 2009 11:30:02 -0400
Subject: need help with properties
Message-ID: <gu47hq$6dg$1@ger.gmane.org>

Hi,

I am just reading about properties in Python. I am thinking
of this as an indirection mechanism, is that wrong? If so, how
come the getter/setters aren't called when I use properties
instead of the functions directly?

What am I missing here? I have a feeling I am overlooking
something simple here...

Thanks,
Esmail

---
#!/usr/bin/env python

#
# quick test to deal with 'private' attributes and
# python properties ...
#

import sys

class Rectangle(object):

     def __init__(self):
         self.__width = 0
         self.__height = 0


     def setSize(self, width, height):
         print 'in setter'
         if (width < 0) or (height < 0):
             print >> sys.stderr, 'Negative values not allowed'
         else:
             self.__width = width
             self.__height = height


     def getSize(self):
         print 'in getter'
         return self.__width, self.__height


     size = property(getSize, setSize)

r = Rectangle()
print r.getSize()
r.setSize(-40, 30)
print r.getSize()

print '-----------------'
size = 3, 7
print size

print '-----------------'
size = -3,7
print size



The program output:


in getter
(0, 0)
in setter
Negative values not allowed
in getter
(0, 0)
-----------------
(3, 7)
-----------------
(-3, 7)



From piet at cs.uu.nl  Sat May  9 11:36:21 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 09 May 2009 17:36:21 +0200
Subject: Thread locking question.
References: <30763887-0b49-47c7-b4c2-76892024b36a@d38g2000prn.googlegroups.com>
Message-ID: <m2ws8qgufe.fsf@cs.uu.nl>

>>>>> grocery_stocker <cdalten at gmail.com> (gs) wrote:

>gs> The following code gets data from 5 different websites at the "same
>gs> time".

>gs> #!/usr/bin/python

>gs> import Queue
>gs> import threading
>gs> import urllib2
>gs> import time

>gs> hosts = ["http://yahoo.com", "http://google.com", "http://amazon.com",
>gs>          "http://ibm.com", "http://apple.com"]

>gs> queue = Queue.Queue()

>gs> class MyUrl(threading.Thread):
>gs>     def __init__(self, queue):
>gs>         threading.Thread.__init__(self)
>gs>         self.queue = queue

>gs>     def run(self):
>gs>         while True:
>gs>             host = self.queue.get()
>gs>             if host is None:
>gs>                 break
>gs>             url = urllib2.urlopen(host)
>gs>             print url.read(1024)
>gs>             #self.queue.task_done()

>gs> start = time.time()

>gs> def main():
>gs>     for i in range(5):
>gs>         t = MyUrl(queue)
>gs>         t.setDaemon(True)
>gs>         t.start()

>gs>     for host in hosts:
>gs>         print "pushing", host
>gs>         queue.put(host)

>gs>     for i in range(5):
>gs>         queue.put(None)

>gs>     t.join()

>gs> if __name__ == "__main__":
>gs>     main()
>gs>     print "Elapsed Time: %s" % (time.time() - start)


>gs> How does the parallel download work if each thread has a lock? When
>gs> the program opens www.yahoo.com, it places a lock on the thread,
>gs> right? If so, then doesn't that mean the other 4 sites have to wait
>gs> for the thread to release the lock?

No. Where does it set a lock? There is only a short lock period in the queue
when an item is put in the queue or got from the queue. And of course we
have the GIL, but this is released as soon as a long during operation is
started - in this case when the Internet communication is done.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From steve at REMOVE-THIS-cybersource.com.au  Sat May  9 11:37:37 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 15:37:37 GMT
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
Message-ID: <02159679$0$20647$c3e8da3@news.astraweb.com>

On Sat, 09 May 2009 07:19:45 -0700, Scott David Daniels wrote:

> > So what if you hard wrap code but let comments and docstrings 
> > soft-wrap?
>
> You apparently have caught the soft-/hard- disease spread by several
> software retailers.  There are no such characters as "hard break," "soft
> break,"  "hard space,"  and "soft space."  Check you ASCII or Unicode
> standards if you disagree.  There is a "non-breaking space" in Unicode,
> but it doesn't mean what you mean.

You say that as if ASCII and Unicode are the only conceivable sets of 
characters.

Even if they are (and they're not), the OP didn't ask about inserting 
hard/soft *characters*. He asked about *actions*: hard-wrapping code and 
soft-wrapping comments. He does that (presumably) by inserting newline 
characters in code where he wants to force a new line, and telling his 
editor to wrap comments according to the editor's own algorithm 
(presumably some variation of the rule "if a line extends beyond the 
right-edge of the window, wrap it to the next line in the display, but do 
not insert a newline character"). This is not a disease, it is very 
useful when editing unstructured text. Believe it or not, text editors 
are not only useful for editing source code *wink*


[aside]
Personally, I think it is just a little bit sad that in 2009 we still 
write programs using editors which are character-based instead of token-
based and syntax-aware. At least good editors have syntax highlighting. 
Maybe in another 20 years, nobody will care about low-level details like 
the characters used to write code. Only the tokens really matter.
[/aside]


My own opinion is that if the OP is not sharing his code with anyone 
else, he can do whatever he likes. Nevertheless, there is value in 
sticking to the standards that the majority use, and so I tend to stick 
to a line length of 70 characters or less for both code and comments. I'm 
not religious about it though.



-- 
Steven


From anuraguniyal at yahoo.com  Sat May  9 11:37:59 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Sat, 9 May 2009 08:37:59 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl> 
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com> 
	<mailman.5338.1241882849.11746.python-list@python.org>
Message-ID: <994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>

Sorry being unclear again, hmm I am becoming an expert in it.

I pasted that code as continuation of my old code at start
i.e
 class A(object):
     def __unicode__(self):
         return u"?au"

     def __repr__(self):
         return unicode(self).encode("utf-8")
     __str__ = __repr__

doesn't work means throws unicode error
my question boils down to
what is diff between, why one doesn't throws error and another does
print unicode(a)
vs
print unicode([a])



From rylesny at gmail.com  Sat May  9 11:39:16 2009
From: rylesny at gmail.com (ryles)
Date: Sat, 9 May 2009 08:39:16 -0700 (PDT)
Subject: slice iterator?
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
Message-ID: <405bb614-28eb-469a-b490-2d38db901a8f@o27g2000vbd.googlegroups.com>

On May 8, 11:17?pm, Ross <ross.j... at gmail.com> wrote:
> I have a really long list that I would like segmented into smaller
> lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> a way to do this without explicitly defining new lists? If the above
> problem were to be split into groups of 3, I've tried something like:
>
> start = 0
> stop = 3
> for i in range(len(a)):
> ? ? segment = a[start:stop]
> ? ? print segment
> ? ? start += stop
> ? ? stop += stop
>
> Unfortunately start and stop don't increment using this code. Ideally,
> my outcome would be
> [1,2,3]
> [4,5,6]
> [7,8,9]
> [10,11,12]

There is also an iterator version here:
http://code.activestate.com/recipes/303279


From pje at telecommunity.com  Sat May  9 11:39:52 2009
From: pje at telecommunity.com (P.J. Eby)
Date: Sat, 09 May 2009 11:39:52 -0400
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <4A059639.7040505@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<4A059639.7040505@v.loewis.de>
Message-ID: <20090509153716.D44633A4080@sparrow.telecommunity.com>

At 04:42 PM 5/9/2009 +0200, Martin v. L?wis wrote:
> >> If you always use --single-version-externally-managed with easy_install,
> >> it will stop editing .pth files on installation.
> >
> > It's --multi-version (-m) that does that.
> > --single-version-externally-managed is a "setup.py install" option.
> >
> > Both have the effect of not editing .pth files, but they do so in
> > different ways.  The "setup.py install" option causes it to install in a
> > distutils-compatible layout, whereas --multi-version simply drops .egg
> > files or directories in the target location and leaves it to the user
> > (or the generated script wrappers) to add them to sys.path.
>
>Ah, ok. Is there also an easy_install invocation that unpacks the zip
>file into some location of sys.path (which then wouldn't require
>editing sys.path)?

Not as yet.  I'm sort of waiting to see what comes out of PEP 376 
discussions re: an installation manifest...  but then, if I actually 
had time to work on it right now, I'd probably just implement something.

Currently, you can use pip to do that, though, as long as the 
packages you want are in source form.  pip doesn't unzip eggs as yet.

It would be really straightforward, though, for someone to implement 
an easy_install variant that does this.  Just invoke "easy_install 
-Zmaxd /some/tmpdir packagelist" to get a full set of unpacked .egg 
directories in /some/tmpdir, and then move the contents of the 
resulting .egg subdirs to the target location, renaming EGG-INFO 
subdirs to projectname-version.egg-info subdirs.

(Of course, this ignores the issue of uninstalling previous versions, 
or overwriting of conflicting files in the target -- does pip handle these?)



From news.btinternet.com at erik.feegles.net  Sat May  9 11:41:59 2009
From: news.btinternet.com at erik.feegles.net (Basil Brush)
Date: Sat, 09 May 2009 16:41:59 +0100
Subject: Anyone familiar with python bittorrent?
Message-ID: <toadnVTiEoeeOZjXnZ2dnUVZ8qSdnZ2d@bt.com>

I was just looking at the bittorrent python code as I'm thinking of
combining it with some other stuff to expand it. Am I right in thinking
that bittorrent launches a new python process for every torrent you
download? That seems not good for what I want to do; if I've got 500
torrents I want to queue I don't want 500 processes running. Does anyone
know if bittorrent can resume a download if the process gets killed?


From Scott.Daniels at Acm.Org  Sat May  9 11:55:15 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 08:55:15 -0700
Subject: need help with properties
In-Reply-To: <mailman.5339.1241883021.11746.python-list@python.org>
References: <mailman.5339.1241883021.11746.python-list@python.org>
Message-ID: <OKadndJuq-ezO5jXnZ2dnUVZ_o6dnZ2d@pdx.net>

Esmail wrote:
> I am just reading about properties in Python. I am thinking
> of this as an indirection mechanism, is that wrong? If so, how
> come the getter/setters aren't called when I use properties
> instead of the functions directly?
Because you weren't actually using them.  You were writing:
     size = 3, 7
not:
     r.size = 3, 7
Try:
     class Rectangle(object):
         def __init__(self):
             self._width = 0 # use single underscore unless you
             self._height = 0 # have a serious reason for __x
         def setSize(self, shape): # a setter takes a single arg
             width, height = shape
             print 'in setter'
             if width < 0 or height < 0:
                 print >> sys.stderr, 'Negative values not allowed'
             else:
                 self._width = width
                 self._height = height
         def getSize(self):
             print 'in getter'
             return self._width, self._height
         size = property(getSize, setSize)

     r = Rectangle()
     print r.getSize()
     r.setSize((-40, 30))
     print r.getSize()
     print '-----------------'
     r.size = 3, 7
     print r.size
     print '-----------------'
     r.size = -3,7
     print r.size

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at REMOVE-THIS-cybersource.com.au  Sat May  9 11:56:37 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 15:56:37 GMT
Subject: need help with properties
References: <mailman.5339.1241883021.11746.python-list@python.org>
Message-ID: <02159aed$0$20647$c3e8da3@news.astraweb.com>

On Sat, 09 May 2009 11:30:02 -0400, Esmail wrote:

> Hi,
> 
> I am just reading about properties in Python. I am thinking of this as
> an indirection mechanism, is that wrong? If so, how come the
> getter/setters aren't called when I use properties instead of the
> functions directly?
> 
> What am I missing here? I have a feeling I am overlooking something
> simple here...

Sure are.

In your test code, you have:

> r = Rectangle()
> print r.getSize()
> r.setSize(-40, 30)
> print r.getSize()
> 
> print '-----------------'
> size = 3, 7
> print size

All you've done in this second block is define a new object called "size" 
and assign the tuple (3, 7) to it. [Aside: you might not be aware that it 
is commas that make tuples, not brackets. The brackets are for grouping.)

"size" has nothing to do with your Rectangle class, or the property. 
Apart from the accidental similarity of name between "Rectangle.size" and 
"size", it's unrelated to the property you created.

What you probably intended to do was this:

print '-----------------'
r.size = 3, 7
print r.size


In other words, your property is attached to the Rectangle instance.



-- 
Steven


From google at mrabarnett.plus.com  Sat May  9 11:57:11 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 09 May 2009 16:57:11 +0100
Subject: Thread locking question.
In-Reply-To: <m2ws8qgufe.fsf@cs.uu.nl>
References: <30763887-0b49-47c7-b4c2-76892024b36a@d38g2000prn.googlegroups.com>
	<m2ws8qgufe.fsf@cs.uu.nl>
Message-ID: <4A05A7D7.6050208@mrabarnett.plus.com>

Piet van Oostrum wrote:
>>>>>> grocery_stocker <cdalten at gmail.com> (gs) wrote:
> 
>> gs> The following code gets data from 5 different websites at the "same
>> gs> time".
> 
[snip]
>> gs> start = time.time()
> 
>> gs> def main():
>> gs>     for i in range(5):
>> gs>         t = MyUrl(queue)
>> gs>         t.setDaemon(True)
>> gs>         t.start()
> 
>> gs>     for host in hosts:
>> gs>         print "pushing", host
>> gs>         queue.put(host)
> 
>> gs>     for i in range(5):
>> gs>         queue.put(None)
> 
>> gs>     t.join()
> 
>> gs> if __name__ == "__main__":
>> gs>     main()
>> gs>     print "Elapsed Time: %s" % (time.time() - start)
> 
> 
>> gs> How does the parallel download work if each thread has a lock? When
>> gs> the program opens www.yahoo.com, it places a lock on the thread,
>> gs> right? If so, then doesn't that mean the other 4 sites have to wait
>> gs> for the thread to release the lock?
> 
> No. Where does it set a lock? There is only a short lock period in the queue
> when an item is put in the queue or got from the queue. And of course we
> have the GIL, but this is released as soon as a long during operation is
> started - in this case when the Internet communication is done.

Also, the code is creating 5 threads, but using join() on only the last
one.


From cdalten at gmail.com  Sat May  9 12:02:17 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sat, 9 May 2009 09:02:17 -0700 (PDT)
Subject: Thread locking question.
References: <30763887-0b49-47c7-b4c2-76892024b36a@d38g2000prn.googlegroups.com>
	<m2ws8qgufe.fsf@cs.uu.nl>
Message-ID: <d0d48afe-0f38-4dd5-b3dd-2827b57844e4@i28g2000prd.googlegroups.com>

On May 9, 8:36 am, Piet van Oostrum <p... at cs.uu.nl> wrote:
> >>>>> grocery_stocker <cdal... at gmail.com> (gs) wrote:
> >gs> The following code gets data from 5 different websites at the "same
> >gs> time".
> >gs> #!/usr/bin/python
> >gs> import Queue
> >gs> import threading
> >gs> import urllib2
> >gs> import time
> >gs> hosts = ["http://yahoo.com", "http://google.com", "http://amazon.com",
> >gs>          "http://ibm.com", "http://apple.com"]
> >gs> queue = Queue.Queue()
> >gs> class MyUrl(threading.Thread):
> >gs>     def __init__(self, queue):
> >gs>         threading.Thread.__init__(self)
> >gs>         self.queue = queue
> >gs>     def run(self):
> >gs>         while True:
> >gs>             host = self.queue.get()
> >gs>             if host is None:
> >gs>                 break
> >gs>             url = urllib2.urlopen(host)
> >gs>             print url.read(1024)
> >gs>             #self.queue.task_done()
> >gs> start = time.time()
> >gs> def main():
> >gs>     for i in range(5):
> >gs>         t = MyUrl(queue)
> >gs>         t.setDaemon(True)
> >gs>         t.start()
> >gs>     for host in hosts:
> >gs>         print "pushing", host
> >gs>         queue.put(host)
> >gs>     for i in range(5):
> >gs>         queue.put(None)
> >gs>     t.join()
> >gs> if __name__ == "__main__":
> >gs>     main()
> >gs>     print "Elapsed Time: %s" % (time.time() - start)
> >gs> How does the parallel download work if each thread has a lock? When
> >gs> the program openswww.yahoo.com, it places a lock on the thread,
> >gs> right? If so, then doesn't that mean the other 4 sites have to wait
> >gs> for the thread to release the lock?
>
> No. Where does it set a lock? There is only a short lock period in the queue
> when an item is put in the queue or got from the queue. And of course we
> have the GIL, but this is released as soon as a long during operation is
> started - in this case when the Internet communication is done.
> --

Maybe I'm being a bit daft, but what prevents the data from www.yahoo.com
from being mixed up with the data from www.google.com? Doesn't using
queue() prevent the data from being mixed up?



From ebonak at hotmail.com  Sat May  9 12:05:33 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 09 May 2009 12:05:33 -0400
Subject: need help with properties
In-Reply-To: <OKadndJuq-ezO5jXnZ2dnUVZ_o6dnZ2d@pdx.net>
References: <mailman.5339.1241883021.11746.python-list@python.org>
	<OKadndJuq-ezO5jXnZ2dnUVZ_o6dnZ2d@pdx.net>
Message-ID: <4A05A9CD.3010001@hotmail.com>

hi Scott,

Scott David Daniels wrote:
> Esmail wrote:
>> I am just reading about properties in Python. I am thinking
>> of this as an indirection mechanism, is that wrong? If so, how
>> come the getter/setters aren't called when I use properties
>> instead of the functions directly?
> Because you weren't actually using them.  You were writing:
>     size = 3, 7
> not:
>     r.size = 3, 7

duh!! .. I knew it had to be something sill .. how do I represent
a red face in ASCII ? ;) I was concentrating so much on the new
feature I totally didn't see this.

I appreciate your code with annotations, helpful.

>         def setSize(self, shape): # a setter takes a single arg
>             width, height = shape
>             print 'in setter'
>             if width < 0 or height < 0:
>                 print >> sys.stderr, 'Negative values not allowed'
>             else:
>                 self._width = width
>                 self._height = height

>     r.setSize((-40, 30))

Just curious, is there a way to pass more than one arg to a setter, or
do we always have use some sort of unpacking at the other end?

Thanks,

Esmail



From steve at REMOVE-THIS-cybersource.com.au  Sat May  9 12:08:37 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 16:08:37 GMT
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
Message-ID: <02159dbd$0$20647$c3e8da3@news.astraweb.com>

On Sat, 09 May 2009 08:37:59 -0700, anuraguniyal at yahoo.com wrote:

> Sorry being unclear again, hmm I am becoming an expert in it.
> 
> I pasted that code as continuation of my old code at start i.e
>  class A(object):
>      def __unicode__(self):
>          return u"?au"
> 
>      def __repr__(self):
>          return unicode(self).encode("utf-8")
>      __str__ = __repr__
> 
> doesn't work means throws unicode error my question 

What unicode error?

Stop asking us to GUESS what the error is, and please copy and paste the 
ENTIRE TRACEBACK that you get. When you ask for free help, make it easy 
for the people trying to help you. If you expect them to copy and paste 
your code and run it just to answer the smallest questions, most of them 
won't bother.




-- 
Steven


From ebonak at hotmail.com  Sat May  9 12:08:58 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 09 May 2009 12:08:58 -0400
Subject: need help with properties
In-Reply-To: <02159aed$0$20647$c3e8da3@news.astraweb.com>
References: <mailman.5339.1241883021.11746.python-list@python.org>
	<02159aed$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <4A05AA9A.3000105@hotmail.com>

Steven D'Aprano wrote:
> 
> All you've done in this second block is define a new object called "size" 
> and assign the tuple (3, 7) to it. 

oops .. yes, you are right, and I am embarrassed...

[Aside: you might not be aware that it
> is commas that make tuples, not brackets. The brackets are for grouping.)

Helpful clarification, thanks!

> "size" has nothing to do with your Rectangle class, or the property. 
> Apart from the accidental similarity of name between "Rectangle.size" and 
> "size", it's unrelated to the property you created.
> 
> What you probably intended to do was this:
> 
> print '-----------------'
> r.size = 3, 7
> print r.size

Yup, I know Python is a dynamically typed language, but I wish it would
point this sort of silliness out .. but there are tradeoffs. I should
probably run pyflakes/pychecker/pylint on my my tiny test/try out codes
too.

Best,
Esmail



From socyl at 987jk.com.invalid  Sat May  9 12:09:38 2009
From: socyl at 987jk.com.invalid (kj)
Date: Sat, 9 May 2009 16:09:38 +0000 (UTC)
Subject: ISO exemplary Python scripts
References: <gu2j3n$a90$1@reader1.panix.com>
	<802a051qoqmpnih0j2su9hhriqumagu326@4ax.com>
Message-ID: <gu49s1$g84$1@reader1.panix.com>

In <802a051qoqmpnih0j2su9hhriqumagu326 at 4ax.com> Tim Roberts <timr at probo.com> writes:

>kj <socyl at 987jk.com.invalid> wrote:
>>
>>I'm learning python, for the umpteenth time.  This time I decided
>>to start out by writing Python scripts for everyday tasks.  Most
>>of these scripts are meant to be used only once or twice, but a
>>few of them have become useful enough that I'd like to make them
>>a little bit more solid...
>>
>>I'd like to learn from well-written Python scripts, with well-structured
>>options parsing, good error and help messages, clear organization,
>>etc.
>>
>>Can someone point me to good examples of Python scripts?

>The standard library that was installed with your interpreter is one of the
>best repositories.  It contains hundreds of working, well-tested scripts,
>most of which have the ability to run by themselves.

Thanks, but the last bit of your post ("...most of which have the
ability to run by themselves") makes me wonder whether we mean the
same thing when we talk of "scripts."  Can you give me an example
of a script that *does not* have the ability to run by itself?
When I use the word "script" I mean, *by definition*, a piece of
code that has the ability to run by itself.

I know that in the python world the distinction between a script
and a (library) module is not so clear-cut, and it is common for
library modules to have "top-level" stuff (typically test code)
that gets run if the module is invoked directly from the command
line.  But this is not *really* a script as I understand it, because,
even though it "runs" directly from the command-line, it lacks the
typical CLI amenities, such as command-line flags, help messages,
diagnostic messages that are aimed to the "naive user" (i.e. as
opposed to the developer), etc.  The coding of these "CLI amenities"
is one of aspects of these "exemplary Python scripts" I'm most
interested in learning about.

Anyway, thanks, I'll poke around in the standard library...

kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From chambon.pascal at wanadoo.fr  Sat May  9 12:32:41 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Sat, 09 May 2009 18:32:41 +0200
Subject: Thread locking question.
In-Reply-To: <d0d48afe-0f38-4dd5-b3dd-2827b57844e4@i28g2000prd.googlegroups.com>
References: <30763887-0b49-47c7-b4c2-76892024b36a@d38g2000prn.googlegroups.com>	<m2ws8qgufe.fsf@cs.uu.nl>
	<d0d48afe-0f38-4dd5-b3dd-2827b57844e4@i28g2000prd.googlegroups.com>
Message-ID: <4A05B029.1090009@wanadoo.fr>

grocery_stocker a ?crit :
> On May 9, 8:36 am, Piet van Oostrum <p... at cs.uu.nl> wrote:
>   
>>>>>>> grocery_stocker <cdal... at gmail.com> (gs) wrote:
>>>>>>>               
>>> gs> The following code gets data from 5 different websites at the "same
>>> gs> time".
>>> gs> #!/usr/bin/python
>>> gs> import Queue
>>> gs> import threading
>>> gs> import urllib2
>>> gs> import time
>>> gs> hosts = ["http://yahoo.com", "http://google.com", "http://amazon.com",
>>> gs>          "http://ibm.com", "http://apple.com"]
>>> gs> queue = Queue.Queue()
>>> gs> class MyUrl(threading.Thread):
>>> gs>     def __init__(self, queue):
>>> gs>         threading.Thread.__init__(self)
>>> gs>         self.queue = queue
>>> gs>     def run(self):
>>> gs>         while True:
>>> gs>             host = self.queue.get()
>>> gs>             if host is None:
>>> gs>                 break
>>> gs>             url = urllib2.urlopen(host)
>>> gs>             print url.read(1024)
>>> gs>             #self.queue.task_done()
>>> gs> start = time.time()
>>> gs> def main():
>>> gs>     for i in range(5):
>>> gs>         t = MyUrl(queue)
>>> gs>         t.setDaemon(True)
>>> gs>         t.start()
>>> gs>     for host in hosts:
>>> gs>         print "pushing", host
>>> gs>         queue.put(host)
>>> gs>     for i in range(5):
>>> gs>         queue.put(None)
>>> gs>     t.join()
>>> gs> if __name__ == "__main__":
>>> gs>     main()
>>> gs>     print "Elapsed Time: %s" % (time.time() - start)
>>> gs> How does the parallel download work if each thread has a lock? When
>>> gs> the program openswww.yahoo.com, it places a lock on the thread,
>>> gs> right? If so, then doesn't that mean the other 4 sites have to wait
>>> gs> for the thread to release the lock?
>>>       
>> No. Where does it set a lock? There is only a short lock period in the queue
>> when an item is put in the queue or got from the queue. And of course we
>> have the GIL, but this is released as soon as a long during operation is
>> started - in this case when the Internet communication is done.
>> --
>>     
>
> Maybe I'm being a bit daft, but what prevents the data from www.yahoo.com
> from being mixed up with the data from www.google.com? Doesn't using
> queue() prevent the data from being mixed up?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
>   
Hello

Each thread has a separate access to internet (its own TCP/IP 
connection, port number etc.), so the incoming data will never get mixed 
between the thread on the input.

The only problem is when you explicitly use shared data structures be 
the threads - like the queue here that they all access.
But the queue is protected against multithreading so there is no problem 
there (another data structure might give bugs, if not explicitly locked 
before use).

On the contarry, there will be mixes on the console (stdout), since each 
thread can write to it at any moment. It's likely that the sources of 
all the pages will get mixed, on your screen, yep. ^^

Regards,
pascal
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From rurpy at yahoo.com  Sat May  9 12:41:45 2009
From: rurpy at yahoo.com (rurpy at yahoo.com)
Date: Sat, 9 May 2009 09:41:45 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl> 
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com> 
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<02159dbd$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <d10cfde6-7550-4fa7-8c6b-6ded066fb35c@n4g2000vba.googlegroups.com>

On May 9, 10:08 am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sat, 09 May 2009 08:37:59 -0700, anuraguni... at yahoo.com wrote:
> > Sorry being unclear again, hmm I am becoming an expert in it.
>
> > I pasted that code as continuation of my old code at start i.e
> >  class A(object):
> >      def __unicode__(self):
> >          return u"?au"
>
> >      def __repr__(self):
> >          return unicode(self).encode("utf-8")
> >      __str__ = __repr__
>
> > doesn't work means throws unicode error my question
>
> What unicode error?
>
> Stop asking us to GUESS what the error is, and please copy and paste the
> ENTIRE TRACEBACK that you get. When you ask for free help, make it easy
> for the people trying to help you. If you expect them to copy and paste
> your code and run it just to answer the smallest questions, most of them
> won't bother.
>
> --
> Steven

Creua H Jiest!

It took me less then 45 seconds to open a terminal window, start
Python, and paste the OPs code to get:
>>> class A(object):
...      def __unicode__(self):
...          return u"?au"
...      def __repr__(self):
...          return unicode(self).encode("utf-8")
...      __str__ = __repr__
...
>>> print unicode(a)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'a' is not defined
>>> a=A()
>>> print unicode(a)
?au
>>> print unicode([a])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
1: ordinal not in range(128)

Which is the same error he had already posted!

I am all for encouraging posters to provide a good description
but let's not be ridiculous.

Anecdote:
My sister always gives her dogs the table scraps after eating
dinner.  One day when I ate there, I tossed the dogs a piece
of meat I hadn't eaten.  "No", she cried!  "You mustn't give
him anything without making him do a trick first!  Otherwise
he'll forget that you are the boss!".


From M8R-gqmgb4 at mailinator.com  Sat May  9 12:42:34 2009
From: M8R-gqmgb4 at mailinator.com (uuid)
Date: Sat, 9 May 2009 18:42:34 +0200
Subject: Get multiprocessing.Queue to do priorities
Message-ID: <4a05b27a_2@news.arcor-ip.de>

Hello,
I was wondering whether there was a way to make multiprocessing.Queue 
behave in a priority queue-like fashion. Subclassing with heappush and 
heappop for put and get doesn't work the old way (multiprocessing.Queue 
seems to use different data structures than Queue.Queue?)

Could one create a heapq within the producer as a proxy, and then feed 
a proper queue from that? Does anyone have an idea on how to deal with 
the queue item flow control? (Since all of the sorting has to happen 
within the heapq, it should only pass items to the real Queue if it's 
empty?)

Thanks in advance!



From jass.zhao at gmail.com  Sat May  9 12:44:22 2009
From: jass.zhao at gmail.com (Gnep)
Date: Sat, 9 May 2009 09:44:22 -0700 (PDT)
Subject: Frozen executable to load external python code at the runtime
Message-ID: <b5200bdc-0353-4072-bbf1-09b9c2e28c3c@d19g2000prh.googlegroups.com>


Hi, all,

Just curious whether I can do the following:

1. My python source code will dynamically load and run external python
scripts;
2. I need to compile the source code to the executable using freeze;
3. Is the executable still able to load&run the scripts?
4. If cannot, is it possible to  freeze the scripts into .so and load
the .so library with dlopen?

BR,
Gnep


From Scott.Daniels at Acm.Org  Sat May  9 12:51:24 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 09:51:24 -0700
Subject: heapq.merge with key=
In-Reply-To: <gu3dni$tkj$00$1@news.t-online.com>
References: <gtvjgk$tm8$1@foggy.unx.sas.com>
	<mailman.5264.1241758129.11746.python-list@python.org>
	<gu1gpj$nue$1@foggy.unx.sas.com>
	<gu3dni$tkj$00$1@news.t-online.com>
Message-ID: <nZCdnXZ109XKLpjXnZ2dnUVZ_ridnZ2d@pdx.net>

Peter Otten wrote:
> Kevin D.  Smith wrote:
> 
>> On 2009-05-07 23:48:43 -0500, Chris Rebert <clp2 at rebertia.com> said:
>>
>>> On Thu, May 7, 2009 at 2:23 PM, Kevin D. Smith <Kevin.Smith at sas.com>
>>> wrote:
>>>> I need the behavior of heapq.merge to merge a bunch of results from a
>>>> database.... I would prefer to do this with generators....  I need
>>>> the key argument to sort on the correct field in the database...
>>> I think so.... [some code]
>> Ah, that's not a bad idea.  I think it could be simplified by letting
>> Python do the comparison work as follows (also untested).
>>
>> def keyify(gen, key=lamda x:x):
>>     for item in gen:
>>         yield (key(item), item)
> ... This is not as general. It makes sorting unstable and can even fail 
> if the items are unorderable:
> One way to fix it:
>>>> def decorate(gen, key):
> ...     for index, item in enumerate(gen):
> ...             yield key(item), index, item
>>>> sorted(decorate([1j, -1j, 1+1j], key=lambda c: c.real))
> [(0.0, 0, 1j), (0.0, 1, -1j), (1.0, 2, (1+1j))]
>>>> list(undecorate(_))
> [1j, -1j, (1+1j)]

However, a heap gets faster if equal items are equal, so you
really want the decorated value to be the sole component of a
comparison.  (and remember, sorts are now stable).
As in your code, key generation is likely best calculated once.
Here's another fix:

     class Keyed(object):
         def __init__(self, obj, key):
             self.obj = obj
             self.key = key

         def __lt__(self, other): # cmp is old-style magic
             return self.key < other.key

         def __eq__(self, other):
             return self.key == other.key

         def __repr__(self):
             return '%s(%r, %r)' % (
		self.__class__.__name__, self.obj, self.key)

     def kmerge(key, *streams):
         keyed_streams = [(Keyed(obj, key(obj)) for obj in stream)
                          for stream in streams]
         for element in heapq.merge(*keyed_streams):
             yield element.obj

--Scott David Daniels
Scott.Daniels at Acm.Org


From M8R-gqmgb4 at mailinator.com  Sat May  9 13:00:54 2009
From: M8R-gqmgb4 at mailinator.com (uuid)
Date: Sat, 9 May 2009 19:00:54 +0200
Subject: Get multiprocessing.Queue to do priorities
References: <4a05b27a_2@news.arcor-ip.de>
Message-ID: <4a05b6c6_2@news.arcor-ip.de>

I just read up and it seems that no matter the approach, it's futile to 
use multiprocessing.Queue, since there is a bug that prevents true 
FIFO. (http://bugs.python.org/issue4999)

Any recommendation on an alternate way to build a priority queue to use 
with a "one producer, many consumers" type multiprocessing setup would 
be welcomed!

:|

On 2009-05-09 18:42:34 +0200, uuid <M8R-gqmgb4 at mailinator.com> said:

> Hello,
> I was wondering whether there was a way to make multiprocessing.Queue 
> behave in a priority queue-like fashion. Subclassing with heappush and 
> heappop for put and get doesn't work the old way (multiprocessing.Queue 
> seems to use different data structures than Queue.Queue?)
> 
> Could one create a heapq within the producer as a proxy, and then feed 
> a proper queue from that? Does anyone have an idea on how to deal with 
> the queue item flow control? (Since all of the sorting has to happen 
> within the heapq, it should only pass items to the real Queue if it's 
> empty?)
> 
> Thanks in advance!




From Scott.Daniels at Acm.Org  Sat May  9 13:39:50 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 10:39:50 -0700
Subject: unicode bit me
In-Reply-To: <d10cfde6-7550-4fa7-8c6b-6ded066fb35c@n4g2000vba.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<02159dbd$0$20647$c3e8da3@news.astraweb.com>
	<d10cfde6-7550-4fa7-8c6b-6ded066fb35c@n4g2000vba.googlegroups.com>
Message-ID: <e7GdnWQoj8AsI5jXnZ2dnUVZ_qydnZ2d@pdx.net>

rurpy at yahoo.com wrote:
> On May 9, 10:08 am, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> On Sat, 09 May 2009 08:37:59 -0700, anuraguni... at yahoo.com wrote:
>>> Sorry being unclear again, hmm I am becoming an expert in it.
>>> I pasted that code as continuation of my old code at start i.e
>>>  class A(object):
>>>      def __unicode__(self):
>>>          return u"?au"
>>>      def __repr__(self):
>>>          return unicode(self).encode("utf-8")
>>>      __str__ = __repr__
>>> doesn't work means throws unicode error my question
>> What unicode error?
>>
>> Stop asking us to GUESS what the error is, and please copy and paste the
>> ENTIRE TRACEBACK that you get. When you ask for free help, make it easy
>> for the people trying to help you. If you expect them to copy and paste
>> your code and run it just to answer the smallest questions, most of them
>> won't bother.

> It took me less then 45 seconds to open a terminal window, start
> Python, and paste the OPs code to get:
>>>> class A(object):
> ...      def __unicode__(self):
> ...          return u"?au"
> ...      def __repr__(self):
> ...          return unicode(self).encode("utf-8")
> ...      __str__ = __repr__
> ...
>>>> print unicode(a)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> NameError: name 'a' is not defined
>>>> a=A()
>>>> print unicode(a)
> ?au
>>>> print unicode([a])
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
> 1: ordinal not in range(128)
> 
> Which is the same error he had already posted!

It is _not_clear_ that is what was going on.
Your 45 seconds could have been his 45 seconds.
He was describing results rather than showing them.

 From your demo, I get to:
    unicode(u'\N{COPYRIGHT SIGN}au'.encode('utf-8'))
raises an exception (which it should).
    unicode(u'\N{COPYRIGHT SIGN}au'.encode('utf-8'), 'utf-8')
Does _not_ raise an exception (as it should not).
Note that his __repr__ produces characters which are not ASCII.
So, str or repr of a list containing those elements will also
be non-ascii.  To convert non-ASCII strings to unicode, you must
specify a character encoding.

The object a (created with A()) can be converted directly to
unicode (via its unicode method).  No problem.
The object A() may have its repr taken, which is a (non-unicode)
string which is not ASCII.  But you cannot take unicode(repr(a)),
because repr(a) contains a character > '\x7f'.
What he was trying to do was masking the issue.  Imagine:

     class B(object):
         def __unicode__(self):
             return u'one'
         def __repr__(self):
             return 'two'
         def __str__(self):
             return 'three'

     b = B()
     print b, unicode(b), [b]

By the way, pasting code with non-ASCII characters does not mean
your recipient will get the characters you pasted.

--Scott David Daniels
Scott.Daniels at Acm.Org


From paul at boddie.org.uk  Sat May  9 13:40:42 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Sat, 9 May 2009 10:40:42 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
Message-ID: <12ef7b00-f0c5-4030-a353-533d93d23cdd@r3g2000vbp.googlegroups.com>

On 9 Mai, 01:36, dpapathanasiou <denis.papathanas... at gmail.com> wrote:
>
> Apache's configure utility (I'm using httpd version 2.2.11) doesn't
> explicitly describe an expat library option.
>
> Also, if libexpat is version 1.95.2, wouldn't I have to get version
> 2.0 to be compatible with pyexpat?

The aim would be to persuade Apache to configure itself against the
same Expat library that pyexpat is using, which would involve the
headers and libraries referenced during the pyexpat configuration
process, although I seem to recall something about pyexpat bundling
its own version of Expat - that would complicate matters somewhat.

> If anyone has any advice or suggestions, I'd appreciate hearing them.

Expat might be getting brought into Apache via mod_dav:

http://www.webdav.org/mod_dav/install.html

Perhaps disabling mod_dav when configuring Apache might drop Expat
from Apache's library dependencies.

Paul


From namekuseijin.nospam at gmail.com  Sat May  9 13:46:43 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Sat, 09 May 2009 14:46:43 -0300
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <gu31sj$mk8$2@lust.ihug.co.nz>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net> <gu29cb$8gg$1@lust.ihug.co.nz>
	<692b7ae8-0c5b-498a-a012-51bda980f3b9@s28g2000vbp.googlegroups.com>
	<gu31sj$mk8$2@lust.ihug.co.nz>
Message-ID: <gu4esf$114e$1@adenine.netfront.net>

Lawrence D'Oliveiro wrote:
> In message <692b7ae8-0c5b-498a-
> a012-51bda980f3b9 at s28g2000vbp.googlegroups.com>, namekuseijin wrote:
> 
>> On May 8, 6:48 pm, Lawrence D'Oliveiro <l... at geek-
>> central.gen.new_zealand> wrote:
>>> In message <gu269i$16i... at adenine.netfront.net>, namekuseijin wrote:
>>>
>>>> Carl Banks escreveu:
>>>>> 2. However, functional programming is cryptic at some level no matter
>>>>> how nice you make the syntax.
>>>> When your program is nothing but function definition and function
>>>> application, syntax is meaningless.
>>> On the contrary, syntax is vital to the correct interpretation of
>>> functional constructs. See, for example,
>>> <http://mail.python.org/pipermail/python-list/2008-October/683816.html>.
>> Yeah, it's important in an imperative language ...
> 
> That was an example of functional programming.

I noticed the use of list comprehensions.  The fact that list 
comprehensions are only available as predefined syntax in Python is 
noticed too.


From Scott.Daniels at Acm.Org  Sat May  9 13:51:56 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 10:51:56 -0700
Subject: need help with properties
In-Reply-To: <mailman.5341.1241885153.11746.python-list@python.org>
References: <mailman.5339.1241883021.11746.python-list@python.org>	<OKadndJuq-ezO5jXnZ2dnUVZ_o6dnZ2d@pdx.net>
	<mailman.5341.1241885153.11746.python-list@python.org>
Message-ID: <28KdnTscUpwaXJjXnZ2dnUVZ_sudnZ2d@pdx.net>

Esmail wrote:
> Just curious, is there a way to pass more than one arg to a setter, or
> do we always have use some sort of unpacking at the other end?

Think about the source for a setter.  it comes from:
     <expr>.name = <expr>
You could add optional args, but the option would never be taken.
If you never intend to move to the 3.X versions of Python, you
code define the function as:

     def setter(self, (height, width)):
         ...

but since introspecting such things to give nice tracebacks and
good help messages drastically complicates the internal python
structure, and since the facility is so fraught with traps for
newbies, who might want to ask for, for example:
     def setter(self, (height=4, width=3)):

the Python 3.X world is wisely losing the unpacking in parameter
passing trick.

--Scott David Daniels
Scott.Daniels at Acm.Org



From ebonak at hotmail.com  Sat May  9 13:53:10 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 09 May 2009 13:53:10 -0400
Subject: need help with properties
In-Reply-To: <28KdnTscUpwaXJjXnZ2dnUVZ_sudnZ2d@pdx.net>
References: <mailman.5339.1241883021.11746.python-list@python.org>	<OKadndJuq-ezO5jXnZ2dnUVZ_o6dnZ2d@pdx.net>	<mailman.5341.1241885153.11746.python-list@python.org>
	<28KdnTscUpwaXJjXnZ2dnUVZ_sudnZ2d@pdx.net>
Message-ID: <4A05C306.3060203@hotmail.com>

Scott David Daniels wrote:
> 
<... good stuff ... >
> 
> the Python 3.X world is wisely losing the unpacking in parameter
> passing trick.

Thanks Scott, useful information,

Esmail



From emile at fenx.com  Sat May  9 13:53:31 2009
From: emile at fenx.com (Emile van Sebille)
Date: Sat, 09 May 2009 10:53:31 -0700
Subject: slice iterator?
In-Reply-To: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
References: <44c5bef2-d19c-49ac-ad3b-24ade0470ae1@z7g2000vbh.googlegroups.com>
Message-ID: <gu4fus$ru6$1@ger.gmane.org>

On 5/8/2009 8:17 PM Ross said...
> I have a really long list that I would like segmented into smaller
> lists. Let's say I had a list a = [1,2,3,4,5,6,7,8,9,10,11,12] and I
> wanted to split it into groups of 2 or groups of 3 or 4, etc. Is there
> a way to do this without explicitly defining new lists? 

 >>> a = [1,2,3,4,5,6,7,8,9,10,11,12]
 >>>
 >>> for k in [2,3,4,5,6]:
...     print [ a[j:j+k] for j in range(0,len(a),k) ]
...
[[1, 2], [3, 4], [5, 6], [7, 8], [9, 10], [11, 12]]
[[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]
[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]]
[[1, 2, 3, 4, 5], [6, 7, 8, 9, 10], [11, 12]]
[[1, 2, 3, 4, 5, 6], [7, 8, 9, 10, 11, 12]]

The point is of course to use the form a[j:j+k] which doesn't create new 
lists.

Emile



From Scott.Daniels at Acm.Org  Sat May  9 13:56:44 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 10:56:44 -0700
Subject: Get multiprocessing.Queue to do priorities
In-Reply-To: <4a05b6c6_2@news.arcor-ip.de>
References: <4a05b27a_2@news.arcor-ip.de> <4a05b6c6_2@news.arcor-ip.de>
Message-ID: <28KdnTocUpw2X5jXnZ2dnUVZ_sudnZ2d@pdx.net>

uuid wrote:
> Any recommendation on an alternate way to build a priority queue to use 
> with a "one producer, many consumers" type multiprocessing setup would 
> be welcomed!

? "one producer, many consumers" ?
What would the priority queue do?  Choose a consumer?

--Scott David Daniels
Scott.Daniels at Acm.Org


From namekuseijin.nospam at gmail.com  Sat May  9 13:57:24 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Sat, 09 May 2009 14:57:24 -0300
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
Message-ID: <gu4fgi$1222$1@adenine.netfront.net>

Carl Banks wrote:
> On May 8, 7:19 pm, namekuseijin <namekusei... at gmail.com> wrote:
>> On May 8, 10:13 pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>> In Haskell, Lisp and other functional programming languages, any extra
>> syntax gets converted into the core lambda constructs.
> 
> So?  The user still uses that syntax, so how can you claim it doesn't
> matter?
>>  In Lisp
>> languages, that syntax is merely user-defined macros, but in Haskell
>> it's builtin the compiler for convenience.
> 
> I don't even know what you're saying here

I'm saying syntax is nothing special.  They are user-defined, as 
functions.  And it all gets converted into functions.  Functions matter, 
syntax is irrelevant because you can do away with it.

In Haskell, point free style of programming shows almost no signs of 
predefined syntax at all.  It's all function composition.

In functional programming languages, predefined syntax is mostly 
irrelevant.  In Python and other imperative languages, it's absolutely 
necessary.  That's my point.


From metolone+gmane at gmail.com  Sat May  9 14:06:56 2009
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Sat, 9 May 2009 11:06:56 -0700
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com><mailman.5310.1241809502.11746.python-list@python.org><m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
Message-ID: <gu4gnv$tua$1@ger.gmane.org>

<anuraguniyal at yahoo.com> wrote in message 
news:994147fb-cdf3-4c55-8dc5-62d769b12cdc at u9g2000pre.googlegroups.com...
> Sorry being unclear again, hmm I am becoming an expert in it.
>
> I pasted that code as continuation of my old code at start
> i.e
>  class A(object):
>      def __unicode__(self):
>          return u"?au"
>
>      def __repr__(self):
>          return unicode(self).encode("utf-8")
>      __str__ = __repr__
>
> doesn't work means throws unicode error
> my question boils down to
> what is diff between, why one doesn't throws error and another does
> print unicode(a)
> vs
> print unicode([a])

That is still an incomplete example.  Your results depend on your source 
code's encoding and your system's stdout encoding.  Assuming a=A(), 
unicode(a) returns u'?au', but then is converted to stdout's encoding for 
display.  An encoding such as cp437 (U.S. Windows console) will fail.  the 
repr of [a] is a byte string in the encoding of your source file.  The 
unicode() function, given a byte string of unspecified encoding, uses the 
ASCII codec.  Assuming your source encoding was utf-8, unicode([a],'utf-8') 
will correctly convert it to unicode, and then printing that unicode string 
will attempt to convert it to stdout encoding.  On a utf-8 console, it will 
work, on a cp437 console it will not.

Here's a new one:

In PythonWin (from pywin32-313), stdout is utf-8, so:

>>> print '?'  # this is a utf8 byte string
?
>>> '?'  # view the utf8 bytes
'\xc2\xa9'
>>> u'?'  # view the unicode character
u'\xa9'
>>> print '\xc2\xa9'  # stdout is utf8, so it is understood
?
>>> print u'\xa9'  # auto-converts to utf8.
?
>>> print unicode('\xc2\xa9')  # encoding not given, defaults to ASCII.
Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 0: 
ordinal not in range(128)
>>> print unicode('\xc2\xa9','utf8')  # provide the encoding
?

This gives different results when the stdout encoding is different.  Here's 
a couple of the same instructions on my Windows console with cp437 encoding, 
which doesn't support the copyright character:

>>> print '\xc2\xa9' # stdout is cp437
??
>>> print u'\xa9'  # tries to convert to cp437
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\dev\python\lib\encodings\cp437.py", line 12, in encode
    return codecs.charmap_encode(input,errors,encoding_map)
UnicodeEncodeError: 'charmap' codec can't encode character u'\xa9' in 
position 0: character maps to <undefined>

Hope that helps your understanding,
Mark





From steve at REMOVE-THIS-cybersource.com.au  Sat May  9 14:21:07 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 09 May 2009 18:21:07 GMT
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
	<gu4fgi$1222$1@adenine.netfront.net>
Message-ID: <0215bccb$0$20647$c3e8da3@news.astraweb.com>

On Sat, 09 May 2009 14:57:24 -0300, namekuseijin wrote:

> I'm saying syntax is nothing special.  They are user-defined, as
> functions.  And it all gets converted into functions.  Functions matter,
> syntax is irrelevant because you can do away with it.

How do you call functions without syntax? By mental telepathy? By direct 
manipulation of the electromagnetic fields inside the CPU?


> In Haskell, point free style of programming shows almost no signs of
> predefined syntax at all.  It's all function composition.

But it takes syntax in order to write function composition. There's at 
least six ways of doing function composition:

f(g(x))    # used in many programming languages and mathematics
f . g (x)  # Haskell
f o g (x)  # mathematics
g f        # stack-based languages like Forth
g x | f    # Unix-like shells
compose(f, g)(x)   # possible in many languages.

> In functional programming languages, predefined syntax is mostly
> irrelevant.  In Python and other imperative languages, it's absolutely
> necessary.  That's my point.

I think your point is wrong. Without syntax, there can be no written 
communication. In Haskell, f.g is not the same as f+g -- the difference 
is one of syntax.


-- 
Steven


From address_is at invalid.invalid  Sat May  9 14:23:25 2009
From: address_is at invalid.invalid (uuid)
Date: 09 May 2009 18:23:25 GMT
Subject: Get multiprocessing.Queue to do priorities
References: <28KdnTocUpw2X5jXnZ2dnUVZ_sudnZ2d@pdx.net>
Message-ID: <529683651263584828.031438address_is-invalid.invalid@news.arcor.de>

Scott David Daniels <Scott.Daniels at Acm.Org> wrote:
> 
> ? "one producer, many consumers" ?
> What would the priority queue do?  Choose a consumer?

Sorry, I should have provided a little more detail. There is one
producer thread, reading urls from multiple files and external input.
These urls have a certain priority, and are fed to multiple consumer
threads for fetching and further processing (XML parsing and such CPU
intensive stuff). Since the content of the urls is changing over time,
it is crucial to have a certain amount of control over the order in
which the requests occur. So, to answer the question: 
The priority queue would make sure that out of a number of
asynchronously added items, those with a high priority are fetched first
by the worker threads. Sounds like a perfect case for a heap, if only I
could :)


From gdamjan at gmail.com  Sat May  9 14:40:06 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Sat, 09 May 2009 20:40:06 +0200
Subject: [Python-Dev] .pth files are evil
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<mailman.5337.1241880127.11746.python-list@python.org>
Message-ID: <69vgd6-hde.ln1@archaeopteryx.softver.org.mk>

> Ah, ok. Is there also an easy_install invocation that unpacks the zip
> file into some location of sys.path (which then wouldn't require
> editing sys.path)?

You have pip that does that :)


-- 
?????? ( http://softver.org.mk/damjan/ )

... knowledge is exactly like power - something 
to be distributed as widely as humanly possible,
for the betterment of all. -- jd



From google at smetj.net  Sat May  9 15:02:14 2009
From: google at smetj.net (google at smetj.net)
Date: Sat, 9 May 2009 12:02:14 -0700 (PDT)
Subject: SimpleXMLRPCServer and creating a new object on for each new 
	client request.
References: <mailman.5173.1241647285.11746.python-list@python.org> 
	<m2ab5ojyff.fsf@cs.uu.nl>
Message-ID: <09a3e655-06ad-46cb-9955-303948f2b271@e24g2000vbe.googlegroups.com>

On May 8, 1:17?am, Piet van Oostrum <p... at cs.uu.nl> wrote:
> >>>>> Jelle Smet <je... at smetj.net> (JS) wrote:
>
> One more thing:
>
> >JS> I start python interactively:
> >>>>> import xmlrpclib
> >>>>> session1=xmlrpclib.ServerProxy('http://localhost:8000')
> >>>>> session2=xmlrpclib.ServerProxy('http://localhost:8000')
> >>>>> print session1.show_random()
> >JS> 13930
> >>>>> print session2.show_random()
> >JS> 13930
>
> I get the impression, also from your use of the variable names
> 'session1' and 'session2' that xmlrpclib.ServerProxy() gives you some
> kind of connection to the XMLRPC server. This is not the case. It gives
> just an administration object *in the client* that will communicate with
> the server when you call a method on it. The two session's in your code
> are therefore functionally equivalent and there is no advantage in
> having two of them instead of one. And the name session is misleading.
>
> Please note also that XMLRPC isn't object-oriented. There is just the
> server; in the protocol there are no objects other than the server.
> --
> Piet van Oostrum <p... at cs.uu.nl>
> URL:http://pietvanoostrum.com[PGP 8DAE142BE17999C4]
> Private email: p... at vanoostrum.org

Hi Piet,
Yes, I'm aware of this.

>You create a single instance of your class and then register that. There
>is nothing in your code that makes the server believe it should create a
>new instance for each request.
>On the other hand, If SimpleXMLRPCServer had this capability, my example wouldn't be correct anyway, because only one instance of class Randomizer is >created when the SimpleXMLRPCServer starts.

Exactly, I understand.

>Otherwise you would have to register a function that creates a new
>instance on every call.
>But as Martin P. Hellwig has noted, it wouldn't give you sessions anyway.

Well, I think Martin's example will suit my needs.

Thanks for the explanation!

Jelle

Thanks for the feedback, ...



From http  Sat May  9 15:08:49 2009
From: http (Paul Rubin)
Date: 09 May 2009 12:08:49 -0700
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
	<gu4fgi$1222$1@adenine.netfront.net>
	<0215bccb$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <7xfxfet7pa.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> I think your point is wrong. Without syntax, there can be no written 
> communication. In Haskell, f.g is not the same as f+g -- the difference 
> is one of syntax.

In Haskell, (+) and (.) are both functions.  (+) takes two numbers as
arguments and returns their sum.  (.) takes two functions as arguments
and returns a new function which composes f and g.  2 + 3 is the same
as (+) 2 3.  f . g is the same as (.) f g.  The infix notations
are considered syntax sugar.  The parentheses around (+) and (.)
are so the compiler doesn't get lexically confused, but you could say

   add = (+)
   compose = (.)
   a = add 2 3
   b = compose square cube
   c = b 2

now "print a" will print 5, and "print c" would print 64 (which is 2**6).
(There aren't actually builtins square and cube, but pretend there are).

So it's really true you can get rid of almost all Haskell expression
syntax.  There's actually a preprocessor called Liskell that lets you
write Haskell as Lisp-like S-expressions, which is handy if you want
to use a macro processor on it.


From piet at cs.uu.nl  Sat May  9 15:31:26 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 09 May 2009 21:31:26 +0200
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
Message-ID: <m263gagjjl.fsf@cs.uu.nl>

>>>>> "Mark Tolonen" <metolone+gmane at gmail.com> (MT) wrote:

>MT> <anuraguniyal at yahoo.com> wrote in message
>MT> news:994147fb-cdf3-4c55-8dc5-62d769b12cdc at u9g2000pre.googlegroups.com...
>>> Sorry being unclear again, hmm I am becoming an expert in it.
>>> 
>>> I pasted that code as continuation of my old code at start
>>> i.e
>>> class A(object):
>>> def __unicode__(self):
>>> return u"?au"
>>> 
>>> def __repr__(self):
>>> return unicode(self).encode("utf-8")
>>> __str__ = __repr__
>>> 
>>> doesn't work means throws unicode error
>>> my question boils down to
>>> what is diff between, why one doesn't throws error and another does
>>> print unicode(a)
>>> vs
>>> print unicode([a])

>MT> That is still an incomplete example.  Your results depend on your source
>MT> code's encoding and your system's stdout encoding.  Assuming a=A(),
>MT> unicode(a) returns u'?au', but then is converted to stdout's encoding for
>MT> display.  

You are confusing the issue. It does not depend on the source code's
encoding (supposing that the encoding declaration in the source is
correct). repr returns unicode(self).encode("utf-8"), so it is utf-8
encoded even when the source code had a different encoding. The u"?au"
string is not dependent on the source encoding.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From piet at cs.uu.nl  Sat May  9 15:43:57 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 09 May 2009 21:43:57 +0200
Subject: Thread locking question.
References: <30763887-0b49-47c7-b4c2-76892024b36a@d38g2000prn.googlegroups.com>
	<m2ws8qgufe.fsf@cs.uu.nl>
	<d0d48afe-0f38-4dd5-b3dd-2827b57844e4@i28g2000prd.googlegroups.com>
Message-ID: <m21vqygiyq.fsf@cs.uu.nl>

>>>>> grocery_stocker <cdalten at gmail.com> (gs) wrote:

[snip]

>gs> Maybe I'm being a bit daft, but what prevents the data from www.yahoo.com
>gs> from being mixed up with the data from www.google.com? Doesn't using
>gs> queue() prevent the data from being mixed up?

Nothing in your script prevents the data from getting mixed up. Now it
seems from some experimentation that the print statements might be atomic,
although I can't find anything about that in the Python doc, and I think
you shouldn't count on that. I would expect it not to be atomic when it
does a blocking I/O.

If I make your example more complete, printing the documents completely,
like:

    def run(self):
        while True:
            host = self.queue.get()
            if host is None:
                break
            url = urllib2.urlopen(host)
            while True:
                txt = url.read(1024)
                if not txt: break
                print txt,

then the document will get mixed up in the output. Likewise if you would
want to put them in a shared datastructure, you must use locking when you
insert them (for example you could put them in another Queue).

The Queue you use here only prevent the urls from getting mixed up, but
it has no effect on the further processing.

As I told my students two days ago: you shouldn't do thread programming
unless you have thoroughly studied the subject.

By the way there is another flaw in your program: you do the join only
on the last spawned thread. Because the threads are daemonic all other
threads that are still working will be killed prematurely when this
thread finishes.

The code should be like this:

def main():
    threads = []
    for i in range(5):
        t = MyUrl(queue)
        t.setDaemon(True)
        t.start()
        threads.append(t)
...
    for t in threads:
        t.join()

Or just don't make them daemonic.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From Scott.Daniels at Acm.Org  Sat May  9 16:00:36 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 13:00:36 -0700
Subject: Get multiprocessing.Queue to do priorities
In-Reply-To: <529683651263584828.031438address_is-invalid.invalid@news.arcor.de>
References: <28KdnTocUpw2X5jXnZ2dnUVZ_sudnZ2d@pdx.net>
	<529683651263584828.031438address_is-invalid.invalid@news.arcor.de>
Message-ID: <-vKdnex07oQzQpjXnZ2dnUVZ_hZi4p2d@pdx.net>

uuid wrote:
> Scott David Daniels <Scott.Daniels at Acm.Org> wrote:
>> ? "one producer, many consumers" ?
>> What would the priority queue do?  Choose a consumer?
> 
> Sorry, I should have provided a little more detail. There is one
> producer thread, reading urls from multiple files and external input.
> These urls have a certain priority, and are fed to multiple consumer
> threads for fetching and further processing (XML parsing and such CPU
> intensive stuff). Since the content of the urls is changing over time,
> it is crucial to have a certain amount of control over the order in
> which the requests occur. So, to answer the question: 
> The priority queue would make sure that out of a number of
> asynchronously added items, those with a high priority are fetched first
> by the worker threads. Sounds like a perfect case for a heap, if only I
> could :)

2.6 has a PriorityQueue in the Queue module.
If you aren't using 2.6, you could copy the code for your own version.

--Scott David Daniels
Scott.Daniels at Acm.Org


From robert.kern at gmail.com  Sat May  9 16:15:40 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 09 May 2009 15:15:40 -0500
Subject: IIR filter conversion routines for Python?
In-Reply-To: <28232dc7-d7d2-4cec-a48e-a0144efa1a5b@v17g2000vbb.googlegroups.com>
References: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>	<mailman.5267.1241760908.11746.python-list@python.org>
	<28232dc7-d7d2-4cec-a48e-a0144efa1a5b@v17g2000vbb.googlegroups.com>
Message-ID: <gu4o9c$fq8$1@ger.gmane.org>

On 2009-05-09 06:54, wzab wrote:

> Unfortunately the Matlab scripts that are floating around the net  do
> not contain the license information.
> (e.g. takasila.coe.psu.ac.th/~s4810685/DSP/proakis/PWS_DSP/dir2cas.m )
> So I don't know if it sufficient to consider the "public domain"...

No! The opposite in fact. No license information simply means you do not have a 
license. It is copyrighted at the moment of creation.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Sat May  9 16:27:02 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 09 May 2009 15:27:02 -0500
Subject: IIR filter conversion routines for Python?
In-Reply-To: <2a7b69f5-9059-4eb0-a1ad-c6c58c98b4dd@t11g2000vbc.googlegroups.com>
References: <af91e679-e8cf-4db5-9c88-6436e520ce4e@z7g2000vbh.googlegroups.com>	<mailman.5267.1241760908.11746.python-list@python.org>	<28232dc7-d7d2-4cec-a48e-a0144efa1a5b@v17g2000vbb.googlegroups.com>
	<2a7b69f5-9059-4eb0-a1ad-c6c58c98b4dd@t11g2000vbc.googlegroups.com>
Message-ID: <gu4oum$i2a$1@ger.gmane.org>

On 2009-05-09 08:34, wzab wrote:
>> In fact I have almost finished the simple dir2cas.py converter.
>> I'll post the source as soon, as it is ready.
>
> OK. So here it is as public domain code. Any hints and suggestions
> of improvements are appreciated.
>
> http://groups.google.com/group/alt.sources/browse_thread/thread/924fbe2255f8c42d

Wow! A shar archive posted to alt.sources. I haven't seen one of those used in 
anger in a *long* time.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From arnodel at googlemail.com  Sat May  9 16:47:42 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 09 May 2009 21:47:42 +0100
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
Message-ID: <m2bpq2ngup.fsf@googlemail.com>

Tobias Weber <towb at gmx.net> writes:

> In article <K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d at pdx.net>,
>  Scott David Daniels <Scott.Daniels at Acm.Org> wrote:
>
>> At least vim and emacs can do so.
>
> Just tried Aquamacs. Using the defaults it correctly re-wraped 
> docstrings using newlines when inserting, but not when removing words.
> So even with the prime editor hard wrap seems, for writing, inferior to 
> soft wrap.

A simple Alt-Q will reformat everything nicely.

-- 
Arnaud (posting using gnus on Aquamacs)


From piet at cs.uu.nl  Sat May  9 16:47:47 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 09 May 2009 22:47:47 +0200
Subject: SimpleXMLRPCServer and creating a new object on for each new
	client request.
References: <mailman.5173.1241647285.11746.python-list@python.org>
	<m2ab5ojyff.fsf@cs.uu.nl>
	<09a3e655-06ad-46cb-9955-303948f2b271@e24g2000vbe.googlegroups.com>
Message-ID: <m2ws8qf1fw.fsf@cs.uu.nl>

>>>>> google at smetj.net (g) wrote:

>g> Well, I think Martin's example will suit my needs.

>g> Thanks for the explanation!

His client code is unnecessarily complicated with 3 session variables.
The following code does the same:

    SESSION = xmlrpclib.ServerProxy(URL_PORT)
    print(SESSION.show_random())
    print(SESSION.show_random())
    SESSION.shutdown_service()

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From metolone+gmane at gmail.com  Sat May  9 17:21:43 2009
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Sat, 9 May 2009 14:21:43 -0700
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com><mailman.5310.1241809502.11746.python-list@python.org><m2eiuzi92l.fsf@cs.uu.nl><977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com><mailman.5338.1241882849.11746.python-list@python.org><994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com><mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
Message-ID: <gu4s55$q7d$1@ger.gmane.org>


"Piet van Oostrum" <piet at cs.uu.nl> wrote in message 
news:m263gagjjl.fsf at cs.uu.nl...
>>>>> "Mark Tolonen" <metolone+gmane at gmail.com> (MT) wrote:

>>MT> <anuraguniyal at yahoo.com> wrote in message
>>MT> 
>>news:994147fb-cdf3-4c55-8dc5-62d769b12cdc at u9g2000pre.googlegroups.com...
>>>> Sorry being unclear again, hmm I am becoming an expert in it.
>>>>
>>>> I pasted that code as continuation of my old code at start
>>>> i.e
>>>> class A(object):
>>>> def __unicode__(self):
>>>> return u"?au"
>>>>
>>>> def __repr__(self):
>>>> return unicode(self).encode("utf-8")
>>>> __str__ = __repr__
>>>>
>>>> doesn't work means throws unicode error
>>>> my question boils down to
>>>> what is diff between, why one doesn't throws error and another does
>>>> print unicode(a)
>>>> vs
>>>> print unicode([a])

>>MT> That is still an incomplete example.  Your results depend on your 
>>source
>>MT> code's encoding and your system's stdout encoding.  Assuming a=A(),
>>MT> unicode(a) returns u'?au', but then is converted to stdout's encoding 
>>for
>>MT> display.

>You are confusing the issue. It does not depend on the source code's
>encoding (supposing that the encoding declaration in the source is
>correct). repr returns unicode(self).encode("utf-8"), so it is utf-8
>encoded even when the source code had a different encoding. The u"?au"
>string is not dependent on the source encoding.

Sorry about that.  I'd forgotten that the OP'd forced __repr__ to utf-8. 
You bring up a good point, though, that the encoding the file is actually 
saved in and the encoding declaration in the source have to match.  Many 
people get that wrong as well.

-Mark




From UrsusMaximus at gmail.com  Sat May  9 17:28:21 2009
From: UrsusMaximus at gmail.com (UrsusMaximus at gmail.com)
Date: Sat, 9 May 2009 14:28:21 -0700 (PDT)
Subject: "Beginning Python Visualization" by Shai Vaingast
Message-ID: <c38538d6-c9bf-425d-b23f-7b848192c677@y34g2000prb.googlegroups.com>

I just read this book and liked it. Here is a review:

Sometimes a picture is worth a thousand words. "Beginning Python
Visualization: Creating Visual Transformation Scripts", published in
February 2009 by Apress, shows how Python and its related tools can be
used to easily and effectively turn raw data into visual
representations that communicate effectively. The author is Shai
Vaingast, a professional engineer and engineering manager who needed
to train scientists and engineers to do this kind of programming work.
He was looking for a tutorial and reference work, and unable to find a
suitable text, wound up writing his first book. He wrote in the easy
and clear style of someone comfortable and engaged with the subject
matter.

The book uses several very specific examples that illustrate general
principles.

The first example is using GPS data. By using Python one can extract
data from GPS receivers and enter it into the computer and manipulate
it to do what one wants including creating graphs and charts. In this
section he shows how to use CSV, comma separated values, as a most
useful file format. He shows show to extract data from real world GPS
devices and import it via serial ports and the PySerial module. It
would be easy for the reader to duplicate and extend this project.

The heart of the book is coverage of useful examples utilizing
MatPlotLib, NumPy and SciPy. These related tools are easy to use and
fully integrated with Python. MatPlotLib is for plotting data and
graphs, including interactive graphs and image files. NumPy is a
powerful math library comparable to commercial tools like MatLab, and
SciPy extends NumPy to for the sciences. Examples are numerous and
include signal analysis using Fourier transforms.

There is also a section on Image Processing using PIL, the Python
Imaging Library. This is used for relatively simple image cropping and
sizing and also for bit by bit image processing. Interpolation and
curve fitting are also well covered. For anyone wanting an
introduction to graphical analysis of statistical data, this would be
an excellent resource.

The author is obviously a professional in this field. He has a knack
for good organizational style and a pragmatic approach to the work. In
the book he says "Most of the time, research is organized chaos. The
emphasis, however, should be on organized, not chaos." A real value I
got from the book is a better understanding of data files, format, and
organization as well as methods and guidelines for selecting file
formats and storing and organizing data to enable fast and efficient
data processing. It is obvious that this book was written by a
practicing engineer.

The theme of the book is that Python can be an all purpose environment
for data manipulation and visualization, using nothing but free and
open source tools that are easily integrated and scriptable without
using multiple programming languages. The book should be an invaluable
tool for scientists and engineers but it is also easily accessible to
anyone interested in math and data analysis. There is no need for an
advanced math background. While, as a matter of full disclosure, I
have undergraduate degrees in Math and Physics, I feel the book should
be easily accessible to anyone with a solid high school math
background who is seriously interested in the subject. The book
contains a short introductory tutorial on the basics of Python so
anyone familiar with programming in any language should be fine.

The book is an easy read from front to back, and I am sure it will
also be a good reference resource for the future. The writing style is
very clear and unforced and I found surprisingly few errors. While the
Python world has a surplus of introductory and general books, books
covering this kind of specific domain are especially welcome, and we
could use more on other topics by competent authors.

At 363 pages the book is a surprisingly fast read. Its methodology is
to use specific, short code examples to make all the key points. Most
of the code samples are well selected, short and written in clear,
concise Python. This is not the kind of book that overwhelms you with
massive amounts of code. Either the book was well edited or else it
was written by an exceptionally lucid thinker, or both.

So, if you want to learn how to process, organize, and visualize data
from various sources using the Python language, I recommend this book
to you.

I also posted a podcast of an interview with the author, Shai
Vaingast, at <a href="http://www.awaretek.com/python/
index.html">Python411</a>



From castironpi at gmail.com  Sat May  9 17:33:06 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Sat, 9 May 2009 14:33:06 -0700 (PDT)
Subject: Why there is a parameter named "self" for classmethod function?
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com> 
	<4A024F18.9080407@kbsymanzik.org>
	<mailman.5206.1241671190.11746.python-list@python.org> 
	<pan.2009.05.07.06.29.56@REMOVE.THIS.cybersource.com.au>
	<2c80e8d0-cc44-48b3-8b90-7b165eb20ed4@g20g2000vba.googlegroups.com>
	<0214c701$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <25e645ad-e471-4f81-9cfa-c979dd1e9f2b@b1g2000vbc.googlegroups.com>

On May 8, 7:52?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Thu, 07 May 2009 04:27:15 -0700, Aaron Brady wrote:
> >> Can be, but if there's reason enough to keep it with a class, there's
> >> no reason not to.
>
> > That's a bit of hyperbole; the usual reasons such as code bloat,
> > namespace bloat, maintainability etc. all weigh against it. ?It's just
> > that the benefits weigh heavier.
>
> I'm not sure I understand. Whether the function is in the class or
> extracted out into the module, it is exactly the same function. (Apart
> from an extra level of indentation, and either an unused "self" parameter
> or a @staticmethod line.) Same amount of code, same difficulty of
> maintainability. Namespace bloat is also the same, the only difference
> being which namespace is bloated: the class or the method.
>
> --
> Steven

My post was a little harsh.  I meant to say that I think I got your
idea, but the form it came in was a tautology.  Its form was X if not
not X.  Tautologies come across as particularly low bandwidth in
writing, though they do have some content in context.  I observe
people say them a lot too: 'it is what it is', 'if I want to I want
to', 'two bucks is two bucks', etc.  Some of the context comes from
the partial conventional asymmetry of sentences in English between
subject and predicate (nominative and accusative), though there is
none in logic.  Not to mention, 'hyperbole' isn't the word for what I
was thinking either... ahem.

The best place for such a function between those two choices can
depend on many things, some of which are matters of taste.  If the
definition occurs in the class, it may be more convenient to read or
edit.  That difference is pretty negligible.  There is semantic
difference to inherited classes: whether you have to import the class
or the class /and/ the function.  Then when it is called, the form
will be either 'class.methodA' or just 'methodA', which makes a
difference in readability (obviousness) elsewhere that it is called.

> being which namespace is bloated: the class or the method.

I think you meant 'class or module'.


From dina.ali08 at googlemail.com  Sat May  9 17:56:17 2009
From: dina.ali08 at googlemail.com (Dina Ali)
Date: Sat, 9 May 2009 22:56:17 +0100
Subject: pyMPI error on mpi.barrier
Message-ID: <4a031c930905091456gd21694ex5cb93ca15cae21f8@mail.gmail.com>

Hello there

I am trying to paralleize GA code using pyMPI. part of the code and and the
error message is as below.
i write the new positions in a file by root (which is mpi.rank = 0) then
other processes are suppose to wait
until the written in the file finishes to start evaluating the objective.
the problem arises in the barrier method...
any ideas on how to do this would be very much appreciated..

for i in xrange(max_iter):
            if (mpi.rank == 0):
                update_positions()
                save_GA_pops_iter()

            mpi.barrier()  <---------------------------- error is here
            evaluate_objective()
            mpi.barrier()

error message:
    mpi.barrier()
mpi.MPIError: MPI_Error_string: invalid communicator: Input/output error
(pyMPI_comm_io.c:367)


Thanks very much
Dina
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From dina.ali08 at googlemail.com  Sat May  9 17:56:55 2009
From: dina.ali08 at googlemail.com (Dina Ali)
Date: Sat, 9 May 2009 22:56:55 +0100
Subject: pyMPI error on mpi.barrier
In-Reply-To: <4a031c930905091456gd21694ex5cb93ca15cae21f8@mail.gmail.com>
References: <4a031c930905091456gd21694ex5cb93ca15cae21f8@mail.gmail.com>
Message-ID: <4a031c930905091456r7ac4e827o5cff61b959f092c8@mail.gmail.com>

Hello there

I am trying to paralleize GA code using pyMPI. part of the code and and the
error message is as below.
i write the new positions in a file by root (which is mpi.rank = 0) then
other processes are suppose to wait
until the written in the file finishes to start evaluating the objective.
the problem arises in the barrier method...
any ideas on how to do this would be very much appreciated..

for i in xrange(max_iter):
            if (mpi.rank == 0):
                update_positions()
                save_GA_pops_iter()

            mpi.barrier()  <---------------------------- error is here
            evaluate_objective()
            mpi.barrier()

error message:
    mpi.barrier()
mpi.MPIError: MPI_Error_string: invalid communicator: Input/output error
(pyMPI_comm_io.c:367)


Thanks very much
Dina
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From dina.ali08 at googlemail.com  Sat May  9 17:57:13 2009
From: dina.ali08 at googlemail.com (Dina Ali)
Date: Sat, 9 May 2009 22:57:13 +0100
Subject: pyMPI error on mpi.barrier
In-Reply-To: <4a031c930905091456r7ac4e827o5cff61b959f092c8@mail.gmail.com>
References: <4a031c930905091456gd21694ex5cb93ca15cae21f8@mail.gmail.com>
	<4a031c930905091456r7ac4e827o5cff61b959f092c8@mail.gmail.com>
Message-ID: <4a031c930905091457s614e0f9bkb2dc7a6426aa71b0@mail.gmail.com>

Hello there

I am trying to paralleize GA code using pyMPI. part of the code and and the
error message is as below.
i write the new positions in a file by root (which is mpi.rank = 0) then
other processes are suppose to wait
until the written in the file finishes to start evaluating the objective.
the problem arises in the barrier method...
any ideas on how to do this would be very much appreciated..

for i in xrange(max_iter):
            if (mpi.rank == 0):
                update_positions()
                save_GA_pops_iter()

            mpi.barrier()  <---------------------------- error is here
            evaluate_objective()
            mpi.barrier()

error message:
    mpi.barrier()
mpi.MPIError: MPI_Error_string: invalid communicator: Input/output error
(pyMPI_comm_io.c:367)


Thanks very much
Dina
-------------- next part --------------
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From M8R-gqmgb4 at mailinator.com  Sat May  9 18:11:21 2009
From: M8R-gqmgb4 at mailinator.com (uuid)
Date: Sun, 10 May 2009 00:11:21 +0200
Subject: Get multiprocessing.Queue to do priorities
References: <4a05b27a_2@news.arcor-ip.de> <4a05b6c6_2@news.arcor-ip.de>
	<28KdnTocUpw2X5jXnZ2dnUVZ_sudnZ2d@pdx.net>
	<529683651263584828.031438address_is-invalid.invalid@news.arcor.de>
	<-vKdnex07oQzQpjXnZ2dnUVZ_hZi4p2d@pdx.net>
Message-ID: <4a05ff89_1@news.arcor-ip.de>

The Queue module, apparently, is thread safe, but *not* process safe. 
If you try to use an ordinary Queue, it appears inaccessible to the 
worker process. (Which, after all, is quite logical, since methods for 
moving items between the threads of the same process are quite 
different from inter-process communication.) It appears that creating a 
manager that holds a shared queue might be an option 
(http://stackoverflow.com/questions/342556/python-2-6-multiprocessing-queue-compatible-with-threads).

Just 

for illustration: This shows that Queue.Queue doesn't work with processes:

------------------------
def worker(queue):
    while True:
        item = queue.get()
        print item
        queue.task_done()

queue_queue = Queue.Queue()

worker_thread = multiprocessing.Process(target=worker, args=(queue_queue,))
worker_thread.start()
for i in range(10):
    queue_queue.put(str(i))
time.sleep(10)
while True:
    try:
        print 'still on queue: ' + queue_queue.get(False)
    except Queue.Empty:
        break
worker_thread.join()
------------------------

This yields:

still on queue: 0
still on queue: 1
still on queue: 2
still on queue: 3
still on queue: 4
still on queue: 5
still on queue: 6
still on queue: 7
still on queue: 8
still on queue: 9

So no queue item ever arrives at the worker process.



On 2009-05-09 22:00:36 +0200, Scott David Daniels <Scott.Daniels at Acm.Org> said:

> 2.6 has a PriorityQueue in the Queue module.
> If you aren't using 2.6, you could copy the code for your own version.




From ben+python at benfinney.id.au  Sat May  9 19:24:11 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 10 May 2009 09:24:11 +1000
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<87zldmcod8.fsf@benfinney.id.au>
	<towb-E9C0DC.18061409052009@news.individual.de>
Message-ID: <87vdo9dfms.fsf@benfinney.id.au>

Tobias Weber <towb at gmx.net> writes:

> In article <87zldmcod8.fsf at benfinney.id.au>,
>  Ben Finney <ben+python at benfinney.id.au> wrote:
> 
> > Yes. Both Emacs and Vim will do exactly this when re-wrapping a
> 
> Thought so. And editors without a learning curve?

A text editor that will be useful in all of your computing is something
worth learning. Instead of needing to re-learn an editor every time you
take up a new text editing task, pick a powerful, customisable editor
and learn it *once*. Either of Emacs or Vim are good choices.

-- 
 \     ?The trouble with the world is that the stupid are cocksure and |
  `\             the intelligent are full of doubt.? ?Bertrand Russell |
_o__)                                                                  |
Ben Finney


From ldo at geek-central.gen.new_zealand  Sat May  9 20:09:13 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 10 May 2009 12:09:13 +1200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
Message-ID: <gu55va$uba$2@lust.ihug.co.nz>

In message <towb-EA7906.14423909052009 at news.individual.de>, Tobias Weber 
wrote:

> the guideline (PEP 8) is hard wrap to 7x characters.

Nowadays I set my maximum line lengths, and the widths of my terminal 
windows to 100 characters. And I'm wondering whether or not to go wider 
still. After all, the screens can take it.



From aahz at pythoncraft.com  Sat May  9 20:09:48 2009
From: aahz at pythoncraft.com (Aahz)
Date: 9 May 2009 17:09:48 -0700
Subject: About twisted.mail.smtp.SMTPDeliveryError
References: <8bb91b91-c00d-48d1-8b64-6f4765754e1c@d19g2000prh.googlegroups.com>
Message-ID: <gu560c$1r6$1@panix3.panix.com>

In article <8bb91b91-c00d-48d1-8b64-6f4765754e1c at d19g2000prh.googlegroups.com>,
gganesh  <ganesh.gbg at gmail.com> wrote:
>
>MAILSERVER = 'mail.xxx.com'
>done = sendmail(MAILSERVER, FROM, listTo,
>MSGBODY ,senderDomainName=None, port=25)
>
>"Failure: twisted.mail.smtp.SMTPDeliveryError: 554 No recipients
>accepted"
>and
>"Relay access denied" errors
>
>Is this error is because, i haven't authenticated my email account to
>send mail.  Is so , having username and password of smpt server ,how to
>authenticate in Twisted Framework

Are you doing this from your local machine?  If yes, you probably need to
use your ISP's SMTP server; blocking non-local access is one technique
for keeping zombied machines from spewing malware.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From Scott.Daniels at Acm.Org  Sat May  9 20:20:40 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 17:20:40 -0700
Subject: Wrapping comments
In-Reply-To: <gu55va$uba$2@lust.ihug.co.nz>
References: <towb-EA7906.14423909052009@news.individual.de>
	<gu55va$uba$2@lust.ihug.co.nz>
Message-ID: <vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d@pdx.net>

Lawrence D'Oliveiro wrote:
> In message <towb-EA7906.14423909052009 at news.individual.de>, Tobias Weber 
> wrote:
> 
>> the guideline (PEP 8) is hard wrap to 7x characters.
> 
> Nowadays I set my maximum line lengths, and the widths of my terminal 
> windows to 100 characters. And I'm wondering whether or not to go wider 
> still. After all, the screens can take it.
> 
But the printers cannot.  And I wind up quietly cursing code writers
who figure the only window I look at is the one they put the code in.
In other words, I have a large enough screen to look at two pages
side-by-side, and somebody decides he wants to use 2/3 of that width.
Think of your reader, not just your operational environment, unless
you are programming on your own and don't care to share.

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at REMOVE-THIS-cybersource.com.au  Sat May  9 20:36:27 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 10 May 2009 00:36:27 GMT
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
	<gu4fgi$1222$1@adenine.netfront.net>
	<0215bccb$0$20647$c3e8da3@news.astraweb.com>
	<7xfxfet7pa.fsf@ruckus.brouhaha.com>
Message-ID: <021614c1$0$20647$c3e8da3@news.astraweb.com>

On Sat, 09 May 2009 12:08:49 -0700, Paul Rubin wrote:

> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
>> I think your point is wrong. Without syntax, there can be no written
>> communication. In Haskell, f.g is not the same as f+g -- the difference
>> is one of syntax.
> 
> In Haskell, (+) and (.) are both functions.

"Left-parens op right-parens" is syntax.

> So it's really true you can get rid of almost all Haskell expression
> syntax.

And what you've got left is syntax. Without syntax, how can you tell the 
difference between a meaningful character string and a jumble of random 
gibberish? Without syntax, how can you tell where one token finishes and 
the next begins?


-- 
Steven


From pavlovevidence at gmail.com  Sat May  9 21:23:13 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 9 May 2009 18:23:13 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com> 
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com> 
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com> 
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com> 
	<gu4fgi$1222$1@adenine.netfront.net>
Message-ID: <24381226-a7a0-4fbb-b928-644609e5909b@w31g2000prd.googlegroups.com>

On May 9, 10:57?am, namekuseijin <namekuseijin.nos... at gmail.com>
wrote:
> Carl Banks wrote:
> > On May 8, 7:19 pm, namekuseijin <namekusei... at gmail.com> wrote:
> >> On May 8, 10:13 pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> >> In Haskell, Lisp and other functional programming languages, any extra
> >> syntax gets converted into the core lambda constructs.
>
> > So? ?The user still uses that syntax, so how can you claim it doesn't
> > matter?
> >> ?In Lisp
> >> languages, that syntax is merely user-defined macros, but in Haskell
> >> it's builtin the compiler for convenience.
>
> > I don't even know what you're saying here
>
> I'm saying syntax is nothing special. ?They are user-defined, as
> functions. ?And it all gets converted into functions. ?Functions matter,
> syntax is irrelevant because you can do away with it.

Nope, sorry, you're ignoring half the problem here.  Syntax is only
irrelevant if you actually do do away with it.  As long as syntax is
there and people use it, then it matters, regardless of whether it all
reduces to function calls.

For a very benign example, consider the ways that Python and Haskell
write listcomps:

[ x for x in ss ]
[ x | x <- ss ]

One of these might be more readable than the other (I make no
implication which); however, readability has nothing to do with
whether the compiler internally reduces it to a function call or not.
Readibility counts, therefore syntax matters.

Now, maybe readability concerns don't matter to you personally, but it
does matter to the OP, who is trying to advocate functional
programming but is having difficulty because most purely functional
languages have hideous minimalist syntax that turns people off.

If that syntax could be made a little more readable and workable,
maybe people wouldn't turn up their noses at it on first sight.


> In Haskell, point free style of programming shows almost no signs of
> predefined syntax at all. ?It's all function composition.
>
> In functional programming languages, predefined syntax is mostly
> irrelevant. ?In Python and other imperative languages, it's absolutely
> necessary. ?That's my point.

I think you are overstating this by a lot.


Carl Banks


From namekuseijin.nospam at gmail.com  Sat May  9 21:28:05 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Sat, 09 May 2009 22:28:05 -0300
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <0215bccb$0$20647$c3e8da3@news.astraweb.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>	<gu269i$16if$1@adenine.netfront.net>	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>	<gu4fgi$1222$1@adenine.netfront.net>
	<0215bccb$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <gu59ti$2646$1@adenine.netfront.net>

Steven D'Aprano wrote:
> On Sat, 09 May 2009 14:57:24 -0300, namekuseijin wrote:
> 
>> I'm saying syntax is nothing special.  They are user-defined, as
>> functions.  And it all gets converted into functions.  Functions matter,
>> syntax is irrelevant because you can do away with it.
> 
> How do you call functions without syntax? By mental telepathy? By direct 
> manipulation of the electromagnetic fields inside the CPU?

That's all the syntax notation you need in functional programming 
languages:  one to define functions, and another to call them.  Any 
extras are sugar around the basic definition and calling forms.


From ldo at geek-central.gen.new_zealand  Sat May  9 21:41:15 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 10 May 2009 13:41:15 +1200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<gu55va$uba$2@lust.ihug.co.nz>
	<vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d@pdx.net>
Message-ID: <gu5bbr$1ua$1@lust.ihug.co.nz>

In message <vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d at pdx.net>, Scott David Daniels 
wrote:

> Lawrence D'Oliveiro wrote:
>
>> In message <towb-EA7906.14423909052009 at news.individual.de>, Tobias Weber
>> wrote:
>> 
>>> the guideline (PEP 8) is hard wrap to 7x characters.
>> 
>> Nowadays I set my maximum line lengths, and the widths of my terminal
>> windows to 100 characters. And I'm wondering whether or not to go wider
>> still. After all, the screens can take it.
>> 
> But the printers cannot.

If I had to print out all the code and documentation I have to look at, I'd 
need to add another room to my house.



From ldo at geek-central.gen.new_zealand  Sat May  9 21:48:20 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 10 May 2009 13:48:20 +1200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<gu55va$uba$2@lust.ihug.co.nz>
	<vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d@pdx.net>
	<gu5bbr$1ua$1@lust.ihug.co.nz>
Message-ID: <gu5bp4$261$1@lust.ihug.co.nz>

In message <gu5bbr$1ua$1 at lust.ihug.co.nz>, Lawrence D'Oliveiro wrote:

> In message <vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d at pdx.net>, Scott David Daniels
> wrote:
> 
>> Lawrence D'Oliveiro wrote:
>>
>>> In message <towb-EA7906.14423909052009 at news.individual.de>, Tobias Weber
>>> wrote:
>>> 
>>>> the guideline (PEP 8) is hard wrap to 7x characters.
>>> 
>>> Nowadays I set my maximum line lengths, and the widths of my terminal
>>> windows to 100 characters. And I'm wondering whether or not to go wider
>>> still. After all, the screens can take it.
>>> 
>> But the printers cannot.
> 
> If I had to print out all the code and documentation I have to look at,
> I'd need to add another room to my house.

And yes, the printers most certainly can take it. Back in the days when you 
couldn't even choose different fonts, the most common width for printouts 
was 132 columns.



From http  Sat May  9 21:51:20 2009
From: http (Paul Rubin)
Date: 09 May 2009 18:51:20 -0700
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
	<gu4fgi$1222$1@adenine.netfront.net>
	<0215bccb$0$20647$c3e8da3@news.astraweb.com>
	<7xfxfet7pa.fsf@ruckus.brouhaha.com>
	<021614c1$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <7xeiux9147.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> > So it's really true you can get rid of almost all Haskell expression
> > syntax.
> 
> And what you've got left is syntax. Without syntax, how can you tell the 
> difference between a meaningful character string and a jumble of random 
> gibberish? Without syntax, how can you tell where one token finishes and 
> the next begins?

I didn't say you could get rid of absolutely all of the syntax.  Just
most of it.  All that stuff you'd write in Python with loops,
if-statements, listcomps, etc. can be done with prefix function calls
in Haskell.

Haskell's type system, on the other hand, is much more complex than
Python's, and writing out type specifications does require some syntax.

Overall though, Haskell's syntax, either at the sugared or desugared
level, is not very complicated.  The hurdles to learning Haskell
really are because the concepts it contains are really different than
what most programmers are familiar with.  It's not like many languages
that contain familiar concepts wrapped in new syntax.


From gdamjan at gmail.com  Sat May  9 23:04:17 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Sun, 10 May 2009 05:04:17 +0200
Subject: How can I dynamically insert a base class in a given class
Message-ID: <iqshd6-qkf.ln1@archaeopteryx.softver.org.mk>

How can I dynamically insert a base class in a given class? Yeah, I'm 
writing a class decorator that needs to manipulate the class by 
inserting another base class in it.


Something like:

class ReallyBase(object):
   def someimportantmethod(self):
     return 'really really'

@expose(args)
class Unsuspecting(object):
   def stuff(self):
     return "ok"

I've come up with this ... but I'm sure it has some shortcomings 

def expose(args):
    def wrap(cls):
       # do stuff with args and cls
       return type(cls.__name__, cls.__bases__ + (ReallyBase,), 
dict(cls.__dict__))
    return wrap



-- 
?????? ( http://softver.org.mk/damjan/ )

war is peace
freedom is slavery
restrictions are enablement



From mnordhoff at mattnordhoff.com  Sat May  9 23:21:43 2009
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Sun, 10 May 2009 03:21:43 +0000
Subject: confused with subprocess.Popen
In-Reply-To: <f6a09c160905080112x2620169fk9249e9469be607ea@mail.gmail.com>
References: <f6a09c160905080112x2620169fk9249e9469be607ea@mail.gmail.com>
Message-ID: <4A064847.4080509@mattnordhoff.com>

Soumen banerjee wrote:
> Hello,
> for a certain app, i used to use a command:
> os.system("soundwrapper espeak -f line.txt")
> now, if i wanted to kill espeak, i would have to run:
> os.system("killall espeak")
> since the subprocess module allows sending SIGKILL to the process, i
> decided to switch to using it. However i cant pass the spaced out
> arguments to it. For example:
> a=subprocess.Popen("soundwrapper espeak -f line.txt")
> results in a OSError, no such file or directory.
> How do i use the Popen function?
> Regards
> Soumen

Read subprocess's documentation. It takes a list, not a string:

>>> a = subprocess.Popen(["soundwrapper", "espeak", "-f", "line.txt"])
-- 


From grante at visi.com  Sat May  9 23:34:48 2009
From: grante at visi.com (Grant Edwards)
Date: Sat, 09 May 2009 22:34:48 -0500
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<gu55va$uba$2@lust.ihug.co.nz>
	<vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d@pdx.net>
Message-ID: <b4KdnfIPlvrF1pvXnZ2dnUVZ_jVi4p2d@posted.usinternet>

On 2009-05-10, Scott David Daniels <Scott.Daniels at Acm.Org> wrote:

>> Nowadays I set my maximum line lengths, and the widths of my terminal 
>> windows to 100 characters. And I'm wondering whether or not to go wider 
>> still. After all, the screens can take it.
>> 
> But the printers cannot.

Printers?

The people who produce books?

What've they got to do with it?

-- 
Grant



From dmw at coder.cl  Sun May 10 00:09:13 2009
From: dmw at coder.cl (Daniel Molina Wegener)
Date: Sun, 10 May 2009 00:09:13 -0400
Subject: [ANN] pyxser-1.0R --- python xml serialization
Message-ID: <7592896.nUPlyArG6x@coder.cl>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hello,

I'm pleased to announce pyxser-1.0R, a Python-Object to XML
serializer and deserializer. This package it's completly
written in C and licensed under LGPLv3.

The tested Python versions are 2.5.X and 2.7.X.

* home page:
  http://coder.cl/software/pyxser

* hosted at:
  https://sourceforge.net/projects/pyxser/

The current ChangeLog is as follows:

1.0rc1 (2009.04.26):

        Daniel Molina Wegener <dmw at coder.cl>
        * Added both byte string and unicode returning and procesing
        functions. This means that we have serialize(),
        serialize_c14n(), serialize_c14n_strict(), unserialize(),
        validate() and validate_c14n() functions for byte strings
        and u_serialize(), u_serialize_c14n(), u_serialize_c14n_strict(),
        u_unserialize(), u_validate() and u_validate_c14n() for
        unicode strings.
        * Removed memory leaks, now it runs over 1400000 pyxser
        operations without crashing (100000 cicles testing every
        function).
        * Removed bugs concerning reference counting that was
        crashing when trying to access unserialized objects attributes.
        * This is an approach to a production environment release ;)

1.0r (2009.05.09):

        Daniel Molina Wegener <dmw at coder.cl>
        * Set default validation to XML Schema validation, to allow
        pyxser to work with WebServices and similar technologies,
        without restricting the namespace prefix to pyxs.
        * Removed memory leaks concerning XML Schema validation.
        * Succeful tests with more than 1.200.000 pyxser operations.
        * Added pyxser 1.0 XML Schema to allow imports of the pyxser
        model into WebServices WSDL and similar technologies.
        * Addded getxsd(), getxsd_c14n(), u_validate_c14n_dtd(),
        u_validate_dtd(), validate_c14n_dtd(), validate_dtd()
        functions.
        * All *_dtd() related functions allows you to validate
        pyxser documents using the pyxser 1.0 DTD, instead of
        the pyxser 1.0 XML Schema.

Feel free to use and test. You can modify test-utf8-prof.py
to use more than 100.000 cicles without crashing.

Best regards,
- -- 
.O.| Daniel Molina Wegener   | C/C++ Developer
..O| dmw [at] coder [dot] cl | FreeBSD & Linux
OOO| http://coder.cl/        | Standards Basis
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From anuraguniyal at yahoo.com  Sun May 10 00:19:36 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Sat, 9 May 2009 21:19:36 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com><mailman.5310.1241809502.11746.python-list@python.org><m2eiuzi92l.fsf@cs.uu.nl><977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com><mailman.5338.1241882849.11746.python-list@python.org><994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com><mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>
Message-ID: <5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>

First of all thanks everybody for putting time with my confusing post
and I apologize for not being clear after so many efforts.

here is my last try (you are free to ignore my request for free
advice)

# -*- coding: utf-8 -*-

class A(object):

    def __unicode__(self):
        return u"?au"

    def __repr__(self):
        return unicode(self).encode("utf-8")

    __str__ = __repr__

a = A()
u1 = unicode(a)
u2 = unicode([a])

now I am not using print so that doesn't matter stdout can print
unicode or not
my naive question is line u2 = unicode([a]) throws
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
1: ordinal not in range(128)

shouldn't list class call unicode on its elements? I was expecting
that
so instead do i had to do this
u3 = "["+u",".join(map(unicode,[a]))+"]"


From anuraguniyal at yahoo.com  Sun May 10 00:21:22 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Sat, 9 May 2009 21:21:22 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com><mailman.5310.1241809502.11746.python-list@python.org><m2eiuzi92l.fsf@cs.uu.nl><977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com><mailman.5338.1241882849.11746.python-list@python.org><994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com><mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org> 
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
Message-ID: <805c54f1-95ca-4947-8f3e-3ec1fdb90c6e@v1g2000prd.googlegroups.com>

and yes replace string by u'\N{COPYRIGHT SIGN}au'
as mentioned earlier non-ascii char may not come correct posted here.

On May 10, 9:19?am, "anuraguni... at yahoo.com" <anuraguni... at yahoo.com>
wrote:
> First of all thanks everybody for putting time with my confusing post
> and I apologize for not being clear after so many efforts.
>
> here is my last try (you are free to ignore my request for free
> advice)
>
> # -*- coding: utf-8 -*-
>
> class A(object):
>
> ? ? def __unicode__(self):
> ? ? ? ? return u"?au"
>
> ? ? def __repr__(self):
> ? ? ? ? return unicode(self).encode("utf-8")
>
> ? ? __str__ = __repr__
>
> a = A()
> u1 = unicode(a)
> u2 = unicode([a])
>
> now I am not using print so that doesn't matter stdout can print
> unicode or not
> my naive question is line u2 = unicode([a]) throws
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
> 1: ordinal not in range(128)
>
> shouldn't list class call unicode on its elements? I was expecting
> that
> so instead do i had to do this
> u3 = "["+u",".join(map(unicode,[a]))+"]"



From nad at acm.org  Sun May 10 00:27:56 2009
From: nad at acm.org (Ned Deily)
Date: Sun, 10 May 2009 00:27:56 -0400
Subject: MacPython 3.0.1 installation problem, no /usr/local/bin/python*
References: <m2vdoad6fd.fsf@yahoo.co.uk>
	<ec96e1390905090735p40bd6c21w5606c521c4c161e5@mail.gmail.com>
Message-ID: <nad-9BA928.00275410052009@ger.gmane.org>

In article 
<ec96e1390905090735p40bd6c21w5606c521c4c161e5 at mail.gmail.com>,
 Benjamin Kaplan <benjamin.kaplan at case.edu> wrote:
> On Sat, May 9, 2009 at 4:30 AM, Raoul Gough <bvdmyrby at jyxk16274849.net>wrote:
> > I just installed MacPython 3.0.1 (woot!) but the installer didn't seem
> > to do an absolutely complete job. According to the ReadMe.txt, "The
> > installer puts [...] command-line tools in /usr/local/bin [...]". This
> > didn't happen - even after the install reported Success, there were no
> > python files or symlinks under /usr/local/bin.
> >
> > Also, I'm guessing there should have been a symlink to the current
> > version under /Library/Frameworks/Python.framework/Versions, which
> > wasn't there either:
> >
> > $ cd /Library/Frameworks/Python.framework
> > $ ls -l Python
> > lrwxr-xr-x  1 root  admin  23 May  9 08:34 Python ->
> > Versions/Current/Python
> > $ ls -l Versions/Current
> > ls: Versions/Current: No such file or directory
> >
> > So I fixed this all up as follows:
> >
> > $ cd /Library/Frameworks/Python.framework/Versions
> > $ sudo ln -s 3.0 Current
> > $ cd /usr/local/bin
> > $ sudo ln -s $(find
> > /Library/Frameworks/Python.framework/Versions/Current/bin -type f) .
> >
> > So did something go wrong with the installer, or is it all supposed to
> > work somehow differently?
> 
> Because Python 3 breaks compatibility with Python 2, the installers don't
> install it as the default. The executable should be at
> /usr/local/bin/python3.0

By default, the 3.0.1 installer does not install any links in 
/usr/local/bin.  To do so, run or re-run the installer, click Customize,  
and then select the "UNIX command-line tools" package.  That creates 
/usr/local/python3.0 and /usr/local/python links, among others.

-- 
 Ned Deily,
 nad at acm.org



From aahz at pythoncraft.com  Sun May 10 00:59:34 2009
From: aahz at pythoncraft.com (Aahz)
Date: 9 May 2009 21:59:34 -0700
Subject: Simple programme - Just want to know whether this is correct way 
	of coding
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
	<7d44d587-15c7-40ea-abe2-6a174f1fd0cd@q14g2000vbn.googlegroups.com>
Message-ID: <gu5mvm$lic$1@panix3.panix.com>

In article <7d44d587-15c7-40ea-abe2-6a174f1fd0cd at q14g2000vbn.googlegroups.com>,
namekuseijin  <namekuseijin at gmail.com> wrote:
>On May 8, 3:37=A0am, guptha <gjango... at gmail.com> wrote:
>>
>> The code Works fine ,but I doubt about the performance issue ,My
>> intention is to send mails concurrently to large number of mail.
>> 1.For every mail id i send It creates a new SMTP object,in case, if i
>> send to 1000 or more ids
>
>why should I help a spammer... ;)

How many subscribers do you think there are to python-list?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From aahz at pythoncraft.com  Sun May 10 01:01:19 2009
From: aahz at pythoncraft.com (Aahz)
Date: 9 May 2009 22:01:19 -0700
Subject: Simple programme - Just want to know whether this is correct way
	of coding
References: <49f8cb54-f268-46bc-a585-6d116674d00d@k19g2000prh.googlegroups.com>
Message-ID: <gu5n2v$m0i$1@panix3.panix.com>

In article <49f8cb54-f268-46bc-a585-6d116674d00d at k19g2000prh.googlegroups.com>,
guptha  <gjango.py at gmail.com> wrote:
>
>This is my first programme in python ,I need to know whether my code
>is in the right path of performance
>
>I wrote a code using multithreading to send mails

Here's the Right Way to do this: install your a local mailserver on your
own machine and configure it to send to your external server.  You should
be able to pump hundreds of messages through it in minimal time.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From kay at fiber-space.de  Sun May 10 01:36:36 2009
From: kay at fiber-space.de (kay at fiber-space.de)
Date: Sat, 9 May 2009 22:36:36 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org>
Message-ID: <f964488e-eb74-44b8-a6e8-760d29192cb1@e24g2000vbe.googlegroups.com>

On 8 Mai, 17:48, Andreas Rumpf <Rump... at web.de> wrote:
> Dear Python-users,
>
> I invented a new programming language called "Nimrod" that combines Python's readability with C's performance. Please check it out:http://force7.de/nimrod/
> Any feedback is appreciated.
>
> Regards,
> Andreas Rumpf
>
> ______________________________________________________
> GRATIS f?r alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!
> Jetzt freischalten unterhttp://movieflat.web.de

On a first impression it looks quite pleasant to me, your new
language! Two obvious questions on a Python list.

1) How to interface with Nimrod from Python?
2) Lack of typed hash-tables. Is this one of those particular features
that are planned to be implemented in version 0.80 and summarized
under "generic containers"?


From soumen08 at gmail.com  Sun May 10 01:37:20 2009
From: soumen08 at gmail.com (Soumen banerjee)
Date: Sun, 10 May 2009 11:07:20 +0530
Subject: confused with subprocess.Popen
In-Reply-To: <4A064847.4080509@mattnordhoff.com>
References: <f6a09c160905080112x2620169fk9249e9469be607ea@mail.gmail.com>
	<4A064847.4080509@mattnordhoff.com>
Message-ID: <f6a09c160905092237h336368c1od45eda6668d9b1e@mail.gmail.com>

Thanks!, i have found that alternately setting shell=True also works


From Scott.Daniels at Acm.Org  Sun May 10 02:19:21 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 09 May 2009 23:19:21 -0700
Subject: unicode bit me
In-Reply-To: <5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com><mailman.5310.1241809502.11746.python-list@python.org><m2eiuzi92l.fsf@cs.uu.nl><977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com><mailman.5338.1241882849.11746.python-list@python.org><994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com><mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
Message-ID: <x92dnQm6nsQv7ZvXnZ2dnUVZ_rydnZ2d@pdx.net>

anuraguniyal at yahoo.com wrote:
> class A(object):
>     def __unicode__(self):
>         return u"?au"
>     def __repr__(self):
>         return unicode(self).encode("utf-8")
>     __str__ = __repr__
> a = A()
> u1 = unicode(a)
> u2 = unicode([a])
> 
> now I am not using print so that doesn't matter stdout can print
> unicode or not
> my naive question is line u2 = unicode([a]) throws
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
> 1: ordinal not in range(128)
> 
> shouldn't list class call unicode on its elements? 
 > I was expecting that so instead do i had to do this
 > u3 = "["+u",".join(map(unicode,[a]))+"]"

Why would you expect that?  str([a]) doesn't call str on its elements.
Using our simple expedient:
     class B(object):
         def __unicode__(self):
             return u'unicode'
         def __repr__(self):
             return 'repr'
         def __str__(self):
             return 'str'
     >>> unicode(B())
     u'unicode'
     >>> unicode([B()])
     u'[repr]'
     >>> str(B())
     'str'
     >>> str([B()])
     '[repr]'

Now if you ask _why_ call repr on its elements,
the answer is, "so that the following is not deceptive:

     >>> repr(["a, b", "c"])
     "['a, b', 'c']"
which does not look like a 3-element list.

--Scott David Daniels
Scott.Daniels at Acm.Org


From piet at cs.uu.nl  Sun May 10 02:29:12 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 10 May 2009 08:29:12 +0200
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
	<805c54f1-95ca-4947-8f3e-3ec1fdb90c6e@v1g2000prd.googlegroups.com>
Message-ID: <m2r5yxfp3b.fsf@cs.uu.nl>

>>>>> "anuraguniyal at yahoo.com" <anuraguniyal at yahoo.com> (ac) wrote:

>ac> and yes replace string by u'\N{COPYRIGHT SIGN}au'
>ac> as mentioned earlier non-ascii char may not come correct posted here.

That shouldn't be a problem for any decent new agent when there is a
proper charset declaration in the headers.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From __peter__ at web.de  Sun May 10 02:32:34 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 10 May 2009 08:32:34 +0200
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
Message-ID: <gu5sdr$jk2$00$1@news.t-online.com>

anuraguniyal at yahoo.com wrote:

> First of all thanks everybody for putting time with my confusing post
> and I apologize for not being clear after so many efforts.
> 
> here is my last try (you are free to ignore my request for free
> advice)

Finally! This is the first of your posts that makes sense to me ;)

> # -*- coding: utf-8 -*-
> 
> class A(object):
> 
>     def __unicode__(self):
>         return u"?au"
> 
>     def __repr__(self):
>         return unicode(self).encode("utf-8")
> 
>     __str__ = __repr__
> 
> a = A()
> u1 = unicode(a)
> u2 = unicode([a])
> 
> now I am not using print so that doesn't matter stdout can print
> unicode or not
> my naive question is line u2 = unicode([a]) throws
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
> 1: ordinal not in range(128)

list doesn't have a __unicode__ method. unicode() therefore converts the 
list to str as a fallback and then uses sys.getdefaultencoding() to convert 
the result to unicode.

> shouldn't list class call unicode on its elements? 

No, it calls repr() on its elements. This is done to avoid confusing output:

>>> items = ["a, b", "[c]"]
>>> items
['a, b', '[c]']
>>> "[%s]" % ", ".join(map(str, items))
'[a, b, [c]]'

> I was expecting that so instead do i had to do this
> u3 = "["+u",".join(map(unicode,[a]))+"]"

Peter



From piet at cs.uu.nl  Sun May 10 03:24:36 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 10 May 2009 09:24:36 +0200
Subject: xml in python
References: <f46c52560905080046t4b9611vb304df22703eb744@mail.gmail.com>
	<mailman.5360.1241924170.11746.python-list@python.org>
Message-ID: <m2my9lfmiz.fsf@cs.uu.nl>

>>>>> Shawn Milochik <Shawn at Milochik.com> (SM) wrote:

>SM> On Fri, May 8, 2009 at 3:46 AM, Rustom Mody <rustompmody at gmail.com> wrote:
>>> Can someone give me a heads up on xml parsing in python?
>>> The context is that I want to write a simple docbook to text converter.
>>> DOM is alright -- dont want to break my head with SAX just for performance
>>> when my documents are not likely to be large.
>>> 
>>> My problem is that there seems to be so many nearly equivalent ways (Pyxml?
>>> Amara?) some of which have moved from 3rd party to builtin status that I am
>>> not clear what is the current method of choice.
>>> 
>>> Thanks
>>> --

>SM> I've been using minidom for simple XML processing with success. The
>SM> XML module seems to be the way to go, considering how many of its
>SM> child modules are listed on http://docs.python.org/library/.

>SM> import xml.dom.minidom as minidom

These days ElementTree is considered the most pythonic way.
http://docs.python.org/library/xml.etree.elementtree.html

There is also a reimplementation of the ElementTree API based on libxml2
and libxslt, which has more features but requires a separate install. It
is largely compatible with ElementTree, however.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From nick at craig-wood.com  Sun May 10 03:30:05 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sun, 10 May 2009 02:30:05 -0500
Subject: Problems with datetime.datetime.strptime
References: <4a05458d$0$24784$9b536df3@news.fv.fi>
Message-ID: <slrnh0cun6.mi5.nick@irishsea.home.craig-wood.com>

Tuomas Vesterinen <tuomas.vesterinen at iki.fi> wrote:
>  I hoped that I could get rid of my special module _strptime2 when 
>  porting to Python 3.0. But testing is a disappointment.
[snip]
>  C :
>     strftime('%a %b %e %H:%M:%S %Y')='Sat May  9 11:26:12 2009'
>     strptime('Sat May  9 11:26:12 2009','%a %b %e %H:%M:%S %Y')=
>       'e' is a bad directive in format '%a %b %e %H:%M:%S %Y'
[snip]
>  What to do.

I'd start by checking out the code for python 3 trunk and seeing if I
could fix it. If I could I'd update the unit tests and the
documentation then submit the patch to the python bugtracker.

If I couldn't fix it then I'd report it as a bug.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nick at craig-wood.com  Sun May 10 03:30:05 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sun, 10 May 2009 02:30:05 -0500
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
Message-ID: <slrnh0d0gd.mi5.nick@irishsea.home.craig-wood.com>

anuraguniyal at yahoo.com <anuraguniyal at yahoo.com> wrote:
>  First of all thanks everybody for putting time with my confusing post
>  and I apologize for not being clear after so many efforts.
> 
>  here is my last try (you are free to ignore my request for free
>  advice)
> 
>  # -*- coding: utf-8 -*-
> 
>  class A(object):
> 
>      def __unicode__(self):
>          return u"?au"
> 
>      def __repr__(self):
>          return unicode(self).encode("utf-8")
> 
>      __str__ = __repr__
> 
>  a = A()
>  u1 = unicode(a)
>  u2 = unicode([a])
> 
>  now I am not using print so that doesn't matter stdout can print
>  unicode or not
>  my naive question is line u2 = unicode([a]) throws
>  UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
>  1: ordinal not in range(128)
> 
>  shouldn't list class call unicode on its elements? 

You mean when you call unicode(a_list) it should unicode() on each of
the elements to build the resultq?

Yes that does seem sensible, however list doesn't have a __unicode__
method at all so I guess it is falling back to using __str__ on each
element, and which explains your problem exactly.

If you try your example on python 3 then you don't need the
__unicode__ method at all (all strings are unicode) and you won't have
the problem I predict. (I haven't got a python 3 in front of me at the
moment to test.)

So I doubt you'll find the momentum to fix this since unicode and str
integration was the main focus of python 3, but you could report a
bug.  If you attach a patch to fix it - so much the better!

Here is my demonstration of the problem with python 2.5.2

>> class A(object):
...     def __unicode__(self):
...         return u"\N{COPYRIGHT SIGN}au"
...     def __repr__(self):
...         return unicode(self).encode("utf-8")
...     __str__ = __repr__
...
>>> a = A()
>>> str(a)
'\xc2\xa9au'
>>> repr(a)
'\xc2\xa9au'
>>> unicode(a)
u'\xa9au'
>>> L=[a]
>>> str(L)
'[\xc2\xa9au]'
>>> repr(L)
'[\xc2\xa9au]'
>>> unicode(L)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
1: ordinal not in range(128)
>>> unicode('[\xc2\xa9au]')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
1: ordinal not in range(128)
>>> L.__unicode__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'list' object has no attribute '__unicode__'
>>> unicode(str(L),"utf-8")
u'[\xa9au]'

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From denize.paul at gmail.com  Sun May 10 03:32:07 2009
From: denize.paul at gmail.com (pdenize)
Date: Sun, 10 May 2009 00:32:07 -0700 (PDT)
Subject: Help needed with filenames
Message-ID: <64840f40-af1c-4e37-a0ab-d928594fca63@v35g2000pro.googlegroups.com>

I have a program that reads files using glob and puts them into an XML
file in UTF-8 using
  unicode(file, sys.getfilesystemencoding()).encode("UTF-8")
This all works fine including all the odd characters like accents etc.

However I also print what it is doing and someone pointed out that
many characters are not printing correctly in the Windows command
window.

I have tried to figure this out but simply get lost in the translation
stuff.
if I just use print filename it has characters that dont match the
ones in the filename (I sorta expected that).
So I tried print unicode(file, sys.getfilesystemencoding()) expecting
the correct result, but no.
UnicodeEncodeError: 'charmap' codec can't encode character u'\u2013'

I did notice that when a windows command window does a directory
listing of these files the characters seem to be translated into close
approximations (long dash to minus, special double quotes to simple
double quotes, but still retains many of the accent chars).  I looked
at translate to do this but did not know how to determine which
characters to map.

Can anyone tell me what I should be doing here?


From __peter__ at web.de  Sun May 10 03:33:40 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 10 May 2009 09:33:40 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org>
	<mailman.5361.1241924171.11746.python-list@python.org>
Message-ID: <gu600c$pvt$00$1@news.t-online.com>

MRAB wrote:

> Marco wrote:
>> Hi,
>> 
>> There happened something that I do not understand. Actually I don't even
>> know how it can be possible.
>> 
>> I import a module and then the name space of the importing module seems
>> do be overwritten.
>> 
>> my_name = __name__
>> print my_name
>> print len(dir())
>> from x import y as z
>> print __name__
>> print len(dir())
>> print my_name
>> 
>> ->
>> __main__
>> 119
>> x
>> 117
>> unhandled NameError "name 'my_name' is not defined"
>> 
>> The module x is from me, and I am not aware of doing anything cruel
>> there. What evil thing can be done in its sub module that can result in
>> that strange thing?
>> 
> You'd have to show us the module. Try to make the smallest module that
> has the same effect.

$ cat x.py
import sys
globals().update(zip(*(range(110),)*2))
y = 42
print __name__
if __name__ == "__main__":
    a = b = 42
print len(dir())
from x import y as z
try:
    print my_name
except NameError, e:
    print 'unhandled NameError: "%s"' % e
    sys.exit()

$ python x.py
__main__
119
x
117
unhandled NameError: "name 'my_name' is not defined"

;)




From M8R-gqmgb4 at mailinator.com  Sun May 10 03:40:04 2009
From: M8R-gqmgb4 at mailinator.com (uuid)
Date: Sun, 10 May 2009 09:40:04 +0200
Subject: xml in python
References: <mailman.5360.1241924170.11746.python-list@python.org>
	<m2my9lfmiz.fsf@cs.uu.nl>
Message-ID: <4a0684d4_2@news.arcor-ip.de>

On 2009-05-10 09:24:36 +0200, Piet van Oostrum <piet at cs.uu.nl> said:
>> 
> 
> These days ElementTree is considered the most pythonic way.
> http://docs.python.org/library/xml.etree.elementtree.html
> 
> There is also a reimplementation of the ElementTree API based on libxml2
> and libxslt, which has more features but requires a separate install. It
> is largely compatible with ElementTree, however.

Indeed - elementtree and its blazing C implementation celementtree are 
included in the standard install.

However, I would also recommend checking out the latter option - lxml. 
It's very fast, has an elementtree compatible API and sports some 
tricks like XPath and XSLT. There's comprehensive documentation as well 
als tutorials, hints and tips here: http://codespeak.net/lxml/



From martin at v.loewis.de  Sun May 10 03:40:44 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 10 May 2009 09:40:44 +0200
Subject: Help needed with filenames
In-Reply-To: <64840f40-af1c-4e37-a0ab-d928594fca63@v35g2000pro.googlegroups.com>
References: <64840f40-af1c-4e37-a0ab-d928594fca63@v35g2000pro.googlegroups.com>
Message-ID: <4a0684fc$0$24009$9b622d9e@news.freenet.de>

> Can anyone tell me what I should be doing here?

The console uses the "OEM code page". The Windows conversion
routine from Unicode to the OEM code page provides the lossy
conversion that you observe in listing.

Unfortunately, the OEM code page conversion is not available
from Python. What you can do is to use

  u.encode(sys.stdout.encoding, "replace")

This will replace unprintable characters with question marks.

Regards,
Martin


From yinon.me at gmail.com  Sun May 10 04:19:29 2009
From: yinon.me at gmail.com (Yinon Ehrlich)
Date: Sun, 10 May 2009 01:19:29 -0700 (PDT)
Subject: Help needed with filenames
References: <64840f40-af1c-4e37-a0ab-d928594fca63@v35g2000pro.googlegroups.com>
Message-ID: <0e0974b3-781e-4b6b-a8d6-7448b31b49e2@o14g2000vbo.googlegroups.com>


> I did notice that when a windows command window does a directory
> listing of these files the characters seem to be translated into close
> approximations (long dash to minus, special double quotes to simple
> double quotes, but still retains many of the accent chars). ?I looked
> at translate to do this but did not know how to determine which
> characters to map.
>
> Can anyone tell me what I should be doing here?

Hi,

Seems like your problem is just with the correct representation of
those characters in Windows command-line.
I have seen two solutions for that:
* Right-click on the top bar of the the command-line window, go to
"properties--> Font", select a font that shows all characters
correctly.
* Even better: use http://sourceforge.net/projects/console - much
better that Windows' default console.

Good luck,
  Yinon


From http  Sun May 10 04:40:56 2009
From: http (Paul Rubin)
Date: 10 May 2009 01:40:56 -0700
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org>
Message-ID: <7xd4ah73l3.fsf@ruckus.brouhaha.com>

Andreas Rumpf <Rumpf_A at web.de> writes:
> I invented a new programming language called "Nimrod" that combines
> Python's readability with C's performance. Please check it out:
> http://force7.de/nimrod/ Any feedback is appreciated.

Looks nice in many ways.  You also know about PyPy and Felix
(felix.sf.net)?

It seems a little bit hackish that the character type is a byte.
Python did something like that but it ended up causing a lot of
hassles when dealing with real Unicode.  I think you have to bite
the bullet and have separate byte and char types, where char=unicode.

It scares me a little about how there are references that can have
naked pointers, escape the gc, etc.  It would be good if the type
system were powerful enough to guarantee the absence of these effects
in some piece of data, unless the data is somehow marked with an
"unsafe" type.

I'd like to see ML-like algebraic types with pattern matching, not
just tuple unpacking.  

The generic system should be able to analyze the AST of type
parameters, e.g. iterator<T> would be able to automatically generate
an iterator over a list, a tree, or some other type of structure, by
actually figuring out at compile time how T is constructed.

It's sort of surprising that the compiler is written in a Pascal
subset.  Why not implement in Nimrod directly, and bootstrap through C?

The language and library are missing arbitrary precision integer
arithmetic, using GMP or something like that.

It would be good to also be able to have value serialization and
deserialization to both human readable (nested lists, etc) and binary
(for IPC) formats.

It's not obvious from the blurbs whether simple functional programming
is supported, e.g. how would you implement a function like "map" or
"filter"?  What would the types be of those two functions?

The roadmap says you might implement threading with transactional
memory.  How will the transactional memory interact with mutable data?
Are you going to use OS threads, lightweight threads, or both?


From anuraguniyal at yahoo.com  Sun May 10 05:46:46 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Sun, 10 May 2009 02:46:46 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl> 
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com> 
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl> 
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
	<slrnh0d0gd.mi5.nick@irishsea.home.craig-wood.com>
Message-ID: <05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>

ok that explains it,
so
unicode(obj) calls __unicode__ on that object and if it isn't there
__repr__ is used
__repr__ of list by default return a str even if __repr__ of element
is unicode


so my only solution looks like to use my own list class everywhere i
use list
class mylist(list):
    def __unicode__(self):
        return u"["+u''.join(map(unicode,self))+u"]"


From deets at nospam.web.de  Sun May 10 05:59:58 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 10 May 2009 11:59:58 +0200
Subject: unicode bit me
In-Reply-To: <05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
	<slrnh0d0gd.mi5.nick@irishsea.home.craig-wood.com>
	<05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>
Message-ID: <76nmsuF1djnc0U1@mid.uni-berlin.de>

anuraguniyal at yahoo.com schrieb:
> ok that explains it,
> so
> unicode(obj) calls __unicode__ on that object and if it isn't there
> __repr__ is used
> __repr__ of list by default return a str even if __repr__ of element
> is unicode
> 
> 
> so my only solution looks like to use my own list class everywhere i
> use list
> class mylist(list):
>     def __unicode__(self):
>         return u"["+u''.join(map(unicode,self))+u"]"

Or you use a custom unicode_list-function whenever you care to print out 
  a list.

Diez


From Shawn at Milochik.com  Sun May 10 07:06:03 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Sun, 10 May 2009 07:06:03 -0400
Subject: "Beginning Python Visualization" by Shai Vaingast
In-Reply-To: <c38538d6-c9bf-425d-b23f-7b848192c677@y34g2000prb.googlegroups.com>
References: <c38538d6-c9bf-425d-b23f-7b848192c677@y34g2000prb.googlegroups.com>
Message-ID: <2dc0c81b0905100406i2bcc8152i10c5ec8b67933ede@mail.gmail.com>

Thanks for the review and the podcast. I ordered the book on Friday. I
look forward to playing with it. Also (assuming you're Ron Stephens),
thanks for the Python 411 podcast. It's a great resource, and I
recommend it to all list members.

Shawn


From steve at REMOVE-THIS-cybersource.com.au  Sun May 10 08:14:35 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 10 May 2009 12:14:35 GMT
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<gu55va$uba$2@lust.ihug.co.nz>
	<vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d@pdx.net>
	<gu5bbr$1ua$1@lust.ihug.co.nz>
Message-ID: <0216b85e$0$20647$c3e8da3@news.astraweb.com>

On Sun, 10 May 2009 13:41:15 +1200, Lawrence D'Oliveiro wrote:

> If I had to print out all the code and documentation I have to look at,
> I'd need to add another room to my house.


You are allowed to throw it away when you're done with it :)



-- 
Steven


From brian at sweetapp.com  Sun May 10 08:16:41 2009
From: brian at sweetapp.com (Brian Quinlan)
Date: Sun, 10 May 2009 13:16:41 +0100
Subject: Java-style futures in Python - only better
Message-ID: <4A06C5A9.7070102@sweetapp.com>

Hey all,

I've been working on an Java-style futures implementation in Python. 
Futures are a way of representing asynchronous operations e.g. 
operations that are run in another thread or process. The are are a easy 
but powerful way of parallelizing sequential operations. The also 
provide a consistent interface across implementations e.g. they can 
provide the same interface to threading and to multiprocessing.

For example:

def is_prime(n):
     "Return True iff n is prime"
     ...

def check_primes(numbers):
     return map(is_prime, numbers)

Could be parallelized as:

def check_primes(numbers):
     # ProcessPoolExecutor will create one worker process
     # per CPU if called without arguments. Using threads
     # is valueless because of the GIL.
     with futures.ProcessPoolExecutor() as executor:
         return executor.map(is_prime, numbers)

A more complex example:

def load_url(url, timeout):
     return urllib.request.urlopen(url, timeout=timeout).read()

### Download the content of some URLs - ignore failures.
def download_urls(urls, timeout=60):
     url_to_content = {}
     for url in urls:
         try:
             url_to_content[url] = load_url(url, timeout=timeout)
         except:
             pass
     return url_to_content

Could be parallelized as:

# Making this a global variable used any many functions ensures that
# the global thread count is kept under control.
executor = futures.ThreadPoolExecutor(50)
def download_urls(urls, timeout=60):
     url_to_content = {}
     # Run load_url for every url and get the result as a FuturesList.
     fs = executor.run_to_futures(
             (functools.partial(load_url, url, timeout) for url in urls),
             timeout=timeout)
     for url, future in zip(urls, fs.successful_futures()):
         url_to_content[url] = future.result()
     return url_to_content


The Python 3.0+ code is here:
http://code.google.com/p/pythonfutures/source

Any feedback on the API would be very much appreciated!

Cheers,
Brian




From aahz at pythoncraft.com  Sun May 10 08:27:05 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 May 2009 05:27:05 -0700
Subject: Missing c.l.py posts (was Re: php to python code converter)
References: <4A044D71.1000500@gmail.com> <1241812993.9340.3.camel@aalcdl07>
	<mailman.5314.1241816812.11746.python-list@python.org>
Message-ID: <gu6h6p$d5v$1@panix3.panix.com>

In article <mailman.5314.1241816812.11746.python-list at python.org>,
MRAB  <google at mrabarnett.plus.com> wrote:
>J. Cliff Dyer wrote:
>> On Fri, 2009-05-08 at 17:19 +0200, Pascal Chambon wrote:
>>>
>>> PS : Am I the only one having most of answers rejected by the
>>> antispam 
>>> system of python-list ? That's humiliating :p
>> 
>> I've had several messages not make it through.
>> 
>> :(
> 
>Same here ("Message has a suspicious header").

I've been trying to investigate several instances of posts to
comp.lang.python.announce getting approved and making it out to the
mailing list but not the newsgroup.  In each case, reposting as plain
text fixed the problem.  I suggest that anyone having similar problems on
c.l.py do the same thing.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From joshua.pearce at gmail.com  Sun May 10 08:28:03 2009
From: joshua.pearce at gmail.com (joshua.pearce at gmail.com)
Date: Sun, 10 May 2009 05:28:03 -0700 (PDT)
Subject: Learning C++ for Python Development
Message-ID: <5d97efc2-af41-4dd6-a243-50f85d54746c@s16g2000vbp.googlegroups.com>

I am a recovering C# web developer who has recently picked up Django
and I'm loving it.

I would eventually like to get a job as a Django/Python developer. It
seems that many Python jobs require that you also be a C++ developer.
While I want to remain primarily a web developer, I don't want be
stuck doing CRUD applications, so I would like to learn C++ for Python
development. I have taken two basic programming courses in straight up
C++, no STL, Boost or anything like that, but I do have a very basic
knowledge of the language.

Can you folks suggest some Python packages which use C++ and are
relevant for web development, so I can dig through the source and
contribute in some way?

Or, just give me some general advice on learning C++ for Python?

P.S. I want to develop on Linux not Windows.

Thanks!


From aahz at pythoncraft.com  Sun May 10 08:28:52 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 May 2009 05:28:52 -0700
Subject: OT (humor): 'import antigravity' in action!
References: <mailman.5354.1241924166.11746.python-list@python.org>
Message-ID: <gu6ha4$sc9$1@panix3.panix.com>

In article <mailman.5354.1241924166.11746.python-list at python.org>,
Shawn Milochik  <Shawn at Milochik.com> wrote:
>
>I know you've probably all seen this 50 times, but just in case:
>http://xkcd.com/353/
>
>And here's the result:
>http://icanhascheezburger.com/2009/05/06/funny-pictures-behavior-20/

Thanks!
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From aahz at pythoncraft.com  Sun May 10 08:42:16 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 May 2009 05:42:16 -0700
Subject: How do I test the integrity of a Python installation in Debian and
	Ubuntu
References: <mailman.5282.1241783298.11746.python-list@python.org>
Message-ID: <gu6i38$jhk$1@panix3.panix.com>

In article <mailman.5282.1241783298.11746.python-list at python.org>,
Geoff Gardiner  <ggardiner at iee.org> wrote:
>
>gegard at gegard:~$ python
>Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52)
>[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
>Type "help", "copyright", "credits" or "license" for more information.
>>>> from test import regrtest
>>>> regrtest.main()
>test_grammar
>test_grammar skipped -- No module named test_grammar
>... <etc> more of the same...
>9 tests skipped:
>    test_builtin test_doctest test_doctest2 test_exceptions
>    test_grammar test_opcodes test_operations test_types test_unittest
>Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File "/usr/lib/python2.5/test/regrtest.py", line 416, in main
>    e = _ExpectedSkips()
>  File "/usr/lib/python2.5/test/regrtest.py", line 1321, in __init__
>    from test import test_socket_ssl
>ImportError: cannot import name test_socket_ssl

What directory are you running this from?  What happens if you switch to
running "python Lib/test/regrtest.py"?  Taking a closer look, this looks
more like a plain import error.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From socyl at 987jk.com.invalid  Sun May 10 08:52:21 2009
From: socyl at 987jk.com.invalid (kj)
Date: Sun, 10 May 2009 12:52:21 +0000 (UTC)
Subject: Q's on my first python script
Message-ID: <gu6im5$1hi$1@reader1.panix.com>


Below is my very firs python script.

This was just a learning exercise; the script doesn't do anything
terribly exciting: for an argument of the form YYMMDD (year, month,
day) it prints out the corresponding string YYMMDDW, where W is a
one-letter abbreviation for the day of the week.  E.g.

% wd 090511
090511M

The script runs OK, but I can still see a few areas of improvement,
for which I could use your advice.

1. The name of the BadArgument exception class defined in the script
   does not seem to me sufficiently specific.  If one were to import
   the script in order to reuse its wkday_abbrev function, I'd like
   this exception's name to be more unequivocally tied to this
   script.  What I'm looking for is something like a "namespace"
   for this script.  What's the pythonic way to construct a namespace?

2. In some python modules I've seen the idiom

   if __name__ == "__main__":
      # run some tests here

   I'd like to set up tests for this script, mostly to ensure that
   it handles the error cases properly, but I'm alread using the
   idiom above to actually run the script under normal operation.
   What's the typical python idiom for running tests on a *script*
   (as opposed to a module that is normally not supposed to be run
   directly)?

3. Still on the subject of testing, how does one capture in a
   variable the output that would normally have gone to stdout or
   stderr?

4. What's the python way to emit warnings?  (The script below should
   warn the user that arguments after the first one are ignored.)

5. The variable wd is meant to be "global" to the script.  In other
   languages I've programmed in I've seen some typographic convention
   used for the name of such variables (e.g. all caps) to signal
   this widened scope.  Does python have such a convention?

Any comments/suggestions on these questions, or anything else about
the script, would be much appreciated.

TIA!

kynn


----------------------------------------------------------------
from optparse import OptionParser
import re
import datetime
import sys

class BadArgument(Exception): pass

wd = ("M", "T", "W", "H", "F", "S", "U")

def wkday_abbrev(str):
  try:
    mm = re.match("(\d{2})(\d{2})(\d{2})\Z", str)

    y, m, d = map(lambda x: int(mm.group(x)), (1,2,3))

    if y < 38: y = y + 1900
    else: y = y + 2000

    return wd[datetime.datetime(y, m, d).weekday()]
  except (AttributeError, ValueError):
    raise BadArgument()


def main():

  usage = '''Usage: %prog [options] YYMMDD
       %prog -h|--help
'''

  parser = OptionParser(usage=usage)
  parser.add_option("-n", "--no-newline", dest="nonl",
                    action="store_true", help="omit newline in output")

  (options, args) = parser.parse_args();

  try:
    sys.stdout.write("%s%s" % (args[0], wkday_abbrev(args[0])))
    if not options.nonl: print

  except (IndexError, BadArgument):
    print usage
    sys.exit(1)
  except: raise

if __name__ == "__main__": main()

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From skip at pobox.com  Sun May 10 09:11:30 2009
From: skip at pobox.com (skip at pobox.com)
Date: Sun, 10 May 2009 08:11:30 -0500
Subject: Missing c.l.py posts (was Re: php to python code converter)
In-Reply-To: <gu6h6p$d5v$1@panix3.panix.com>
References: <4A044D71.1000500@gmail.com> <1241812993.9340.3.camel@aalcdl07>
	<mailman.5314.1241816812.11746.python-list@python.org>
	<gu6h6p$d5v$1@panix3.panix.com>
Message-ID: <18950.53890.865512.979083@montanaro.dyndns.org>


    >>>> PS : Am I the only one having most of answers rejected by the
    >>>> antispam system of python-list ? That's humiliating :p
    >>> 
    >>> I've had several messages not make it through.
    >>> 
    >>> :(
    >> 
    >> Same here ("Message has a suspicious header").

    Aahz> I've been trying to investigate several instances of posts to
    Aahz> comp.lang.python.announce getting approved and making it out to
    Aahz> the mailing list but not the newsgroup.  In each case, reposting
    Aahz> as plain text fixed the problem.  I suggest that anyone having
    Aahz> similar problems on c.l.py do the same thing.

The problem lies with moi.  The ham/spam database had grown rather huge.  I
tossed out a bunch of older ham and spam messages from the database and
retrained.  That caused a large fraction of new posts to be held as
"unsure".  Unfortunately, I didn't notice that for a couple days.  I added a
couple hundred of the recently held hams and spams to the database and
retrained last night.  This morning nothing new was held.  Hopefully that
will solve the problem.

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/
    America's vaunted "free press" notwithstanding, story ideas that expose
    the unseemly side of actual or potential advertisers tend to fall by the
    wayside.  Not quite sure why.  -- Jim Thornton


From ggardiner at iee.org  Sun May 10 09:26:40 2009
From: ggardiner at iee.org (Geoff Gardiner)
Date: Sun, 10 May 2009 14:26:40 +0100
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
In-Reply-To: <gu6i38$jhk$1@panix3.panix.com>
References: <mailman.5282.1241783298.11746.python-list@python.org>
	<gu6i38$jhk$1@panix3.panix.com>
Message-ID: <4A06D610.5090107@iee.org>

Aahz wrote:
> ....
> What directory are you running this from?  What happens if you switch to
> running "python Lib/test/regrtest.py"?  Taking a closer look, this looks
> more like a plain import error.
>   

Thank you for your suggestion.

I couldn't do quite that because there's no Lib, but instead (in Ubuntu
Hardy, this time):
....
gegard at gegard:~$ cd /usr/lib/python2.5/
gegard at gegard:/usr/lib/python2.5$ python test/regrtest.py
test_grammar
test_grammar skipped -- No module named test_grammar
test_opcodes
test_opcodes skipped -- No module named test_opcodes
test_operations
test_operations skipped -- No module named test_operations
test_builtin
test_builtin skipped -- No module named test_builtin
test_exceptions
test_exceptions skipped -- No module named test_exceptions
test_types
test_types skipped -- No module named test_types
test_unittest
test_unittest skipped -- No module named test_unittest
test_doctest
test_doctest skipped -- No module named test_doctest
test_doctest2
test_doctest2 skipped -- No module named test_doctest2
9 tests skipped:
    test_builtin test_doctest test_doctest2 test_exceptions
    test_grammar test_opcodes test_operations test_types test_unittest
Traceback (most recent call last):
  File "test/regrtest.py", line 1384, in <module>
    main()
  File "test/regrtest.py", line 416, in main
    e = _ExpectedSkips()
  File "test/regrtest.py", line 1321, in __init__
    from test import test_socket_ssl
ImportError: cannot import name test_socket_ssl
gegard at gegard:/usr/lib/python2.5$

Also
gegard at gegard:~$ locate */test_socket_ssl.*
gegard at gegard:~$ #returns nothing

And
gegard at gegard:~$ locate /usr/lib/python2.5/test/test_*.*
/usr/lib/python2.5/test/test_support.py
/usr/lib/python2.5/test/test_support.pyc
gegard at gegard:~$

All the best,
Geoff




From jnoller at gmail.com  Sun May 10 09:35:03 2009
From: jnoller at gmail.com (Jesse Noller)
Date: Sun, 10 May 2009 09:35:03 -0400
Subject: Get multiprocessing.Queue to do priorities
In-Reply-To: <4a05ff89_1@news.arcor-ip.de>
References: <4a05b27a_2@news.arcor-ip.de> <4a05b6c6_2@news.arcor-ip.de>
	<28KdnTocUpw2X5jXnZ2dnUVZ_sudnZ2d@pdx.net>
	<529683651263584828.031438address_is-invalid.invalid@news.arcor.de>
	<-vKdnex07oQzQpjXnZ2dnUVZ_hZi4p2d@pdx.net>
	<4a05ff89_1@news.arcor-ip.de>
Message-ID: <4222a8490905100635o7b64bb88n403feae50a320973@mail.gmail.com>

On Sat, May 9, 2009 at 6:11 PM, uuid <M8R-gqmgb4 at mailinator.com> wrote:
> The Queue module, apparently, is thread safe, but *not* process safe. If you
> try to use an ordinary Queue, it appears inaccessible to the worker process.
> (Which, after all, is quite logical, since methods for moving items between
> the threads of the same process are quite different from inter-process
> communication.) It appears that creating a manager that holds a shared queue
> might be an option
> (http://stackoverflow.com/questions/342556/python-2-6-multiprocessing-queue-compatible-with-threads).

Using a manager, or submitting a patch which adds priority queue to
the multiprocessing.queue module is the correct solution for this.

You can file an enhancement in the tracker, and assign/add me to it,
but without a patch it may take me a bit (wicked busy right now).

jesse


From tuomas.vesterinen at iki.fi  Sun May 10 10:18:30 2009
From: tuomas.vesterinen at iki.fi (Tuomas Vesterinen)
Date: Sun, 10 May 2009 17:18:30 +0300
Subject: Problems with datetime.datetime.strptime
In-Reply-To: <slrnh0cun6.mi5.nick@irishsea.home.craig-wood.com>
References: <4a05458d$0$24784$9b536df3@news.fv.fi>
	<slrnh0cun6.mi5.nick@irishsea.home.craig-wood.com>
Message-ID: <4a06e236$0$24790$9b536df3@news.fv.fi>

Nick Craig-Wood wrote:
> Tuomas Vesterinen <tuomas.vesterinen at iki.fi> wrote:
>>  I hoped that I could get rid of my special module _strptime2 when 
>>  porting to Python 3.0. But testing is a disappointment.
> [snip]
>>  C :
>>     strftime('%a %b %e %H:%M:%S %Y')='Sat May  9 11:26:12 2009'
>>     strptime('Sat May  9 11:26:12 2009','%a %b %e %H:%M:%S %Y')=
>>       'e' is a bad directive in format '%a %b %e %H:%M:%S %Y'
> [snip]
>>  What to do.
> 
> I'd start by checking out the code for python 3 trunk and seeing if I
> could fix it. If I could I'd update the unit tests and the
> documentation then submit the patch to the python bugtracker.
> 
> If I couldn't fix it then I'd report it as a bug.
> 

Thanks. I have a Python implementation here:

   http://kotisivu.dnainternet.net/tuovest1/booker/booker-0.1.2.tar.gz

See folder booker/csvcnt modules _strptime2.py and time_forms.py.

TV


From paul at boddie.org.uk  Sun May 10 10:27:13 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Sun, 10 May 2009 07:27:13 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
Message-ID: <09709e90-6c58-47f1-94e7-43605875d3ae@l28g2000vba.googlegroups.com>

On 10 Mai, 10:40, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>
> Looks nice in many ways. ?You also know about PyPy and Felix
> (felix.sf.net)?

Try http://felix-lang.org/ for the latter, I believe.

Paul


From M8R-gqmgb4 at mailinator.com  Sun May 10 10:30:53 2009
From: M8R-gqmgb4 at mailinator.com (uuid)
Date: Sun, 10 May 2009 16:30:53 +0200
Subject: Get multiprocessing.Queue to do priorities
References: <4a05b27a_2@news.arcor-ip.de> <4a05b6c6_2@news.arcor-ip.de>
	<28KdnTocUpw2X5jXnZ2dnUVZ_sudnZ2d@pdx.net>
	<529683651263584828.031438address_is-invalid.invalid@news.arcor.de>
	<-vKdnex07oQzQpjXnZ2dnUVZ_hZi4p2d@pdx.net>
	<4a05ff89_1@news.arcor-ip.de>
	<mailman.5376.1241962506.11746.python-list@python.org>
Message-ID: <4a06e51d_2@news.arcor-ip.de>

Dear Jesse,
thanks for the hint.

I see you are already assigned to the FIFO bug 
(http://bugs.python.org/issue4999), so I won't burden you even more. 
Clearly, a reliable FIFO behavior of multiprocessing.Queue helps more 
than a priority queue, since it can be used to build one, so that 
should really be the first thing to fix.

In the meantime, I think I'll whip up a hack that uses sort of a 
bucket- strategy: fill up a prioritized heapq, and then, in regular 
intervals, unload its contents into a size-limited multiprocessing 
queue.

I'll post this as soon as it works.

-u

On 2009-05-10 15:35:03 +0200, Jesse Noller <jnoller at gmail.com> said:

> Using a manager, or submitting a patch which adds priority queue to
> the multiprocessing.queue module is the correct solution for this.
> 
> You can file an enhancement in the tracker, and assign/add me to it,
> but without a patch it may take me a bit (wicked busy right now).
> 
> jesse




From piet at cs.uu.nl  Sun May 10 11:10:50 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 10 May 2009 17:10:50 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org>
	<mailman.5361.1241924171.11746.python-list@python.org>
	<gu600c$pvt$00$1@news.t-online.com>
Message-ID: <m2skjddmdh.fsf@cs.uu.nl>

>>>>> Peter Otten <__peter__ at web.de> (PO) wrote:

>PO> $ cat x.py
>PO> import sys
>PO> globals().update(zip(*(range(110),)*2))
>PO> y = 42
>PO> print __name__
>PO> if __name__ == "__main__":
>PO>     a = b = 42
>PO> print len(dir())
>PO> from x import y as z
>PO> try:
>PO>     print my_name
>PO> except NameError, e:
>PO>     print 'unhandled NameError: "%s"' % e
>PO>     sys.exit()

>PO> $ python x.py
>PO> __main__
>PO> 119
>PO> x
>PO> 117
>PO> unhandled NameError: "name 'my_name' is not defined"

This is perfectly normal. python x.py command runs normally (although
the globals().update is a very weird thing to do), until the from x
import y command. Then x.py is loaded again but now as the module 'x'
instead of '__main__'. Python doesn't know it's the same file, and
actually it doesn't want to know. It only knows it when you do import
twice on the same file. Not when you run it as a main script first and
then imports it. **This is a thing you shouldn't do**.
There are now two namespaces: one for __main__ and one for x. These are
distinct and have no relationship. 

The reason that the first number is 119 and the second is 117 is that
while importing x the variables a and b are not created.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From chiendarret at gmail.com  Sun May 10 11:18:51 2009
From: chiendarret at gmail.com (Francesco Pietra)
Date: Sun, 10 May 2009 17:18:51 +0200
Subject: strip part of string
Message-ID: <b87c422a0905100818w1bc2db1fpf640ca987482ba79@mail.gmail.com>

Hi:
I would like to delete everything from column 54 on for each line
beginning with "ATOM". In the example in the attachment (sorry for the
attachment; I found no way with Google mail to have plain text mail)
the new line would become:

ATOM     49  NH1 ARG    84      84.628  41.570  44.395

without any blank space to the right. . Everything else should remain
at its original column. I have been looking for ???? statement, unable
(my big fault ) to find a right one. I tried with slices % but it
becomes unnecessarily complex.


Thanks
francesco
-------------- next part --------------
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From google at mrabarnett.plus.com  Sun May 10 11:34:42 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 10 May 2009 16:34:42 +0100
Subject: strip part of string
In-Reply-To: <b87c422a0905100818w1bc2db1fpf640ca987482ba79@mail.gmail.com>
References: <b87c422a0905100818w1bc2db1fpf640ca987482ba79@mail.gmail.com>
Message-ID: <4A06F412.8050405@mrabarnett.plus.com>

Francesco Pietra wrote:
> Hi:
> I would like to delete everything from column 54 on for each line
> beginning with "ATOM". In the example in the attachment (sorry for the
> attachment; I found no way with Google mail to have plain text mail)
> the new line would become:
> 
> ATOM     49  NH1 ARG    84      84.628  41.570  44.395
> 
> without any blank space to the right. . Everything else should remain
> at its original column. I have been looking for ???? statement, unable
> (my big fault ) to find a right one. I tried with slices % but it
> becomes unnecessarily complex.
> 
data = open('rec.crg', 'r')
outp = open('rec.strip.crg', 'w')

for L in data:
    if L[3] == 'M':
      L = L[:55].rstrip() + '\n'
    outp.write(L)

data.close()
outp.close()


Note that .rstrip() will strip all whitespace from the right-hand end of
the string, including the '\n' at the end of the string/line, so a new
'\n' has to be added.


From steve at REMOVE-THIS-cybersource.com.au  Sun May 10 11:36:17 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 10 May 2009 15:36:17 GMT
Subject: strip part of string
References: <mailman.5377.1241968734.11746.python-list@python.org>
Message-ID: <0216e7a2$0$20647$c3e8da3@news.astraweb.com>

On Sun, 10 May 2009 17:18:51 +0200, Francesco Pietra wrote:

> Hi:
> I would like to delete everything from column 54 on for each line
> beginning with "ATOM". In the example in the attachment (sorry for the
> attachment; I found no way with Google mail to have plain text mail) the
> new line would become:
> 
> ATOM     49  NH1 ARG    84      84.628  41.570  44.395

if line.startswith("ATOM"):
    line = line[0:54].rstrip()

should do what you want.



-- 
Steven


From zooko at zooko.com  Sun May 10 11:41:33 2009
From: zooko at zooko.com (Zooko Wilcox-O'Hearn)
Date: Sun, 10 May 2009 09:41:33 -0600
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <20090509153716.D44633A4080@sparrow.telecommunity.com>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<4A059639.7040505@v.loewis.de>
	<20090509153716.D44633A4080@sparrow.telecommunity.com>
Message-ID: <7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>

On May 9, 2009, at 9:39 AM, P.J. Eby wrote:

> It would be really straightforward, though, for someone to  
> implement an easy_install variant that does this.  Just invoke  
> "easy_install -Zmaxd /some/tmpdir packagelist" to get a full set of  
> unpacked .egg directories in /some/tmpdir, and then move the  
> contents of the resulting .egg subdirs to the target location,  
> renaming EGG-INFO subdirs to projectname-version.egg-info subdirs.

Except for the renaming part, this is exactly what GNU stow does.

> (Of course, this ignores the issue of uninstalling previous  
> versions, or overwriting of conflicting files in the target -- does  
> pip handle these?)

GNU stow does handle these issues.

Regards,

Zooko


From sjmachin at lexicon.net  Sun May 10 11:52:51 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 10 May 2009 08:52:51 -0700 (PDT)
Subject: strip part of string
References: <mailman.5377.1241968734.11746.python-list@python.org>
Message-ID: <bcaaeff9-6a18-4b1b-b5c9-467369bb36e6@n7g2000prc.googlegroups.com>

On May 11, 1:18?am, Francesco Pietra <chiendar... at gmail.com> wrote:
> Hi:
> I would like to delete everything from column 54 on for each line
> beginning with "ATOM". In the example in the attachment (sorry for the
> attachment; I found no way with Google mail to have plain text mail)

Many of your audience won't have seen your quite unnecessary
attachment; you could have in-lined the text just like this:
[except that I've deleted empty lines, and chopped some irrelevant
stuff off the right hand end of some lines so that line-wrapping won't
confuse anybody any more than they are already :-)
]

8<---
# Sample line
#           1         2         3         4         5
# 012345678901234567890123456789012345678901234567890123456789
# ATOM     49  NH1 ARG    84      84.628  41.570  44.395  0.00
data = open('rec.crg', 'r')
outp = open('rec.strip.crg', 'w')
for L in data:
   if L[3] == 'M':
     L = L[:55] ???????
   outp.write(L)
8<---

> the new line would become:
>
> ATOM ? ? 49 ?NH1 ARG ? ?84 ? ? ?84.628 ?41.570 ?44.395
>
> without any blank space to the right. . Everything else should remain
> at its original column. I have been looking for ???? statement, unable
> (my big fault ) to find a right one. I tried with slices % but it
> becomes unnecessarily complex.

You wish to retain 54 characters, but are retaining 55. You need a
newline on the end of the line. So the statement
    L = L[:55]
should be
    L = L[:54] + '\n'
You may wish to precede that with
    assert len(L) >= 54
You may wish to change
    if L[3] == 'M':
to
    if L.startswith('ATOM'):
to accord with your requirements statement.

HTH,
John


From Florian.Wollenschein at FernUni-Hagen.de  Sun May 10 11:55:20 2009
From: Florian.Wollenschein at FernUni-Hagen.de (Florian Wollenschein)
Date: Sun, 10 May 2009 17:55:20 +0200
Subject: Nimrod programming language
In-Reply-To: <mailman.5356.1241924167.11746.python-list@python.org>
References: <mailman.5356.1241924167.11746.python-list@python.org>
Message-ID: <gu6td8$ks7$1@news-cedar.fernuni-hagen.de>

Andreas Rumpf wrote:
> Dear Python-users,
> 
> I invented a new programming language called "Nimrod" that combines Python's readability with C's performance. Please check it out: http://force7.de/nimrod/
> Any feedback is appreciated.
> 
> Regards,
> Andreas Rumpf
> 
> ______________________________________________________
> GRATIS f?r alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!
> Jetzt freischalten unter http://movieflat.web.de
> 

Looks really interesting. I think I'll give it a try later on.
Thanks for your announcement.

Reagrds,
Listick
http://www.listick.org


From gnewsg at gmail.com  Sun May 10 11:55:39 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Sun, 10 May 2009 08:55:39 -0700 (PDT)
Subject: ANN: Python process utility (psutil) 0.1.2 released
References: <65f15b53-aacf-4651-a113-960cce25f205@p4g2000vba.googlegroups.com>
	<slrnh0ah9f.mk1.nick@irishsea.home.craig-wood.com>
Message-ID: <a52e2c7e-4a32-453a-b5c8-cd42cc3efe5e@r36g2000vbr.googlegroups.com>

On 9 Mag, 11:30, Nick Craig-Wood <n... at craig-wood.com> wrote:
> Giampaolo Rodola' <gne... at gmail.com> wrote:
> > ?psutil is a module providing an interface for retrieving information
> > ?on running processes and system utilization (CPU, memory) in a
> > ?portable way by using Python, implementing many functionalities
> > ?offered by tools like ps, top and Windows task manager.
> > ?It currently supports Linux, OS X, FreeBSD and Windows.
>
> Very nice!
>
> Maybe you should make
>
> ? Process()
>
> mean
>
> ? Process(os.getpid())
>
> as I often want ask how much memory/cpu is my process using but rarely
> want to ask about other processes?
>
> It would be nice if "pydoc psutil" returned something useful also!
> You could do this by replacing your current __init__.py (which just
> contains "from _psutil import *") with _psutil.py
>
> --
> Nick Craig-Wood <n... at craig-wood.com> --http://www.craig-wood.com/nick

Thanks for the hints. I'll do that.


--- Giampaolo Rodola'
http://code.google.com/p/pyftpdlib
http://code.google.com/p/psutil/


From steve at REMOVE-THIS-cybersource.com.au  Sun May 10 11:56:00 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 10 May 2009 15:56:00 GMT
Subject: Q's on my first python script
References: <gu6im5$1hi$1@reader1.panix.com>
Message-ID: <0216ec41$0$20647$c3e8da3@news.astraweb.com>

On Sun, 10 May 2009 12:52:21 +0000, kj wrote:

> 1. The name of the BadArgument exception class defined in the script
>    does not seem to me sufficiently specific.  If one were to import the
>    script in order to reuse its wkday_abbrev function, I'd like this
>    exception's name to be more unequivocally tied to this script.  What
>    I'm looking for is something like a "namespace" for this script. 
>    What's the pythonic way to construct a namespace?

You already have one. The module you have created is a namespace. If your 
script is called "myscript.py", then to use it elsewhere you would do:

import myscript
raise myscript.BadArgument


> 2. In some python modules I've seen the idiom
> 
>    if __name__ == "__main__":
>       # run some tests here
> 
>    I'd like to set up tests for this script, mostly to ensure that it
>    handles the error cases properly, but I'm alread using the idiom
>    above to actually run the script under normal operation. What's the
>    typical python idiom for running tests on a *script* (as opposed to a
>    module that is normally not supposed to be run directly)?

I sometimes give my scripts an option -t or --self-test, and then run 
tests if that option is passed on the command line.

Alternatively, put your tests in another module, say, myscript_tests.py, 
and then just run that when you want to test myscript.

 
> 3. Still on the subject of testing, how does one capture in a
>    variable the output that would normally have gone to stdout or
>    stderr?

Normally you would write the function to *return* the result, rather than 
*print* the result. If all output goes through the function return 
mechanism, then it's easy to capture: x = func().

However, for cases where the function does print directly, you can 
redefine stdout and strerr to be any file-like object, so you can do 
something like this:


# untested
import sys
import cStringIO
save_stdout, save_stderr = sys.stdout, sys.stderr
c1 = cStringIO.StringIO()
c2 = cStringIO.StringIO()
try:
    sys.stdout = c1
    sys.stderr = c2
    result = func(*args, **kwargs)  # normally prints some stuff
finally:
    # restore standard files
    sys.stdout = save_stdout
    sys.stderr = save_stderr
captured_from_stdout = c1.getvalue()
captured_from_stderr = c2.getvalue()


 
> 4. What's the python way to emit warnings?  (The script below should
>    warn the user that arguments after the first one are ignored.)

import warnings
warnings.warn("The end of the world is coming!")


> 5. The variable wd is meant to be "global" to the script.  In other
>    languages I've programmed in I've seen some typographic convention
>    used for the name of such variables (e.g. all caps) to signal this
>    widened scope.  Does python have such a convention?

As a general rule, it's best to avoid globals variables as much as 
possible.

One convention I occasionally use is to prefix global variables with a 
lowercase g. And then ruthlessly refactor my code until any variable 
starting with a lowercase g is removed :)




-- 
Steven


From sjmachin at lexicon.net  Sun May 10 11:59:53 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 10 May 2009 08:59:53 -0700 (PDT)
Subject: strip part of string
References: <b87c422a0905100818w1bc2db1fpf640ca987482ba79@mail.gmail.com> 
	<mailman.5378.1241969686.11746.python-list@python.org>
Message-ID: <d4450796-5fbf-4eb2-b1ec-f37f7ba6842b@y6g2000prf.googlegroups.com>

On May 11, 1:34?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> Francesco Pietra wrote:
> > Hi:
> > I would like to delete everything from column 54 on for each line
> > beginning with "ATOM". In the example in the attachment (sorry for the
> > attachment; I found no way with Google mail to have plain text mail)
> > the new line would become:
>
> > ATOM ? ? 49 ?NH1 ARG ? ?84 ? ? ?84.628 ?41.570 ?44.395
>
> > without any blank space to the right. . Everything else should remain
> > at its original column. I have been looking for ???? statement, unable
> > (my big fault ) to find a right one. I tried with slices % but it
> > becomes unnecessarily complex.
>
> data = open('rec.crg', 'r')
> outp = open('rec.strip.crg', 'w')
>
> for L in data:
> ? ? if L[3] == 'M':
> ? ? ? L = L[:55].rstrip() + '\n'
> ? ? outp.write(L)
>
> data.close()
> outp.close()
>
> Note that .rstrip() will strip all whitespace from the right-hand end of
> the string, including the '\n' at the end of the string/line, so a new
> '\n' has to be added.

His line-terminal '\n' has already disappeared before the rstrip gets
a guernsey.
His "column 54" is counting from 0, not from 1 -- his [:55] is getting
him an extra space which he doesn't want.


From anuraguniyal at yahoo.com  Sun May 10 12:04:03 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Sun, 10 May 2009 09:04:03 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl> 
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com> 
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl> 
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
	<slrnh0d0gd.mi5.nick@irishsea.home.craig-wood.com>
	<05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>
	<76nmsuF1djnc0U1@mid.uni-berlin.de>
Message-ID: <3334d202-a5ad-4819-aab6-cb736845b955@y6g2000prf.googlegroups.com>

yes but my list sometimes have list of lists

On May 10, 2:59?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> anuraguni... at yahoo.com schrieb:
>
> > ok that explains it,
> > so
> > unicode(obj) calls __unicode__ on that object and if it isn't there
> > __repr__ is used
> > __repr__ of list by default return a str even if __repr__ of element
> > is unicode
>
> > so my only solution looks like to use my own list class everywhere i
> > use list
> > class mylist(list):
> > ? ? def __unicode__(self):
> > ? ? ? ? return u"["+u''.join(map(unicode,self))+u"]"
>
> Or you use a custom unicode_list-function whenever you care to print out
> ? a list.
>
> Diez



From rustompmody at gmail.com  Sun May 10 12:10:11 2009
From: rustompmody at gmail.com (Rustom Mody)
Date: Sun, 10 May 2009 21:40:11 +0530
Subject: help with recursive whitespace filter in
Message-ID: <f46c52560905100910i616f291k29e756afcf7574f0@mail.gmail.com>

I am trying to write a recursive filter to remove whitespace-only
nodes for minidom.
The code is below.

Strangely it deletes some whitespace nodes and leaves some.
If I keep calling it -- like so: fws(fws(fws(doc)))  then at some
stage all the ws nodes disappear

Does anybody have a clue?


from xml.dom.minidom import parse

#The input to fws is the output of parse("something.xml")


def fws(ele):
    """ filter white space (recursive)"""

   for c in ele.childNodes:
        if isWsNode(c):
            ele.removeChild(c)
            #c.unlink() Makes no diff whether this is there or not
        elif c.nodeType == ele.ELEMENT_NODE:
            fws(c)


def isWsNode(ele):
    return (ele.nodeType == ele.TEXT_NODE and not ele.data.strip())


From brian at sweetapp.com  Sun May 10 12:23:16 2009
From: brian at sweetapp.com (Brian Quinlan)
Date: Sun, 10 May 2009 17:23:16 +0100
Subject: Java-style futures in Python - only better
In-Reply-To: <4A06FA0B.1060000@ncf.ca>
References: <mailman.5372.1241957806.11746.python-list@python.org>
	<4A06FA0B.1060000@ncf.ca>
Message-ID: <4A06FF74.7060405@sweetapp.com>

Colin J. Williams wrote:
> Brian,
> 
> Since the word "future" is part of the Python lingo:
> 
> A future statement is a directive to the compiler that a particular 
> module should be compiled using syntax or semantics that will be 
> available in a specified future release of Python. The future statement 
> is intended to ease migration to future versions of Python that 
> introduce incompatible changes to the language. It allows use of the new 
> features on a per-module basis before the release in which the feature 
> becomes standard.
> 
> Have you given thought to the use of another word?

I named the module "futures" (plural) to try to reduce the potential 
confusion with the "__futures__" module.

The concept of a future is fairly well known in CS 
[http://en.wikipedia.org/wiki/Future_(programming)] so giving it a 
completely different name would be a bit annoying.

Cheers,
Brian

> Colin W.
> 
> Brian Quinlan wrote:
>> Hey all,
>>
>> I've been working on an Java-style futures implementation in Python. 
>> Futures are a way of representing asynchronous operations e.g. 
>> operations that are run in another thread or process. The are are a 
>> easy but powerful way of parallelizing sequential operations. The also 
>> provide a consistent interface across implementations e.g. they can 
>> provide the same interface to threading and to multiprocessing.
>>
>> For example:
>>
>> def is_prime(n):
>>     "Return True iff n is prime"
>>     ...
>>
>> def check_primes(numbers):
>>     return map(is_prime, numbers)
>>
>> Could be parallelized as:
>>
>> def check_primes(numbers):
>>     # ProcessPoolExecutor will create one worker process
>>     # per CPU if called without arguments. Using threads
>>     # is valueless because of the GIL.
>>     with futures.ProcessPoolExecutor() as executor:
>>         return executor.map(is_prime, numbers)
>>
>> A more complex example:
>>
>> def load_url(url, timeout):
>>     return urllib.request.urlopen(url, timeout=timeout).read()
>>
>> ### Download the content of some URLs - ignore failures.
>> def download_urls(urls, timeout=60):
>>     url_to_content = {}
>>     for url in urls:
>>         try:
>>             url_to_content[url] = load_url(url, timeout=timeout)
>>         except:
>>             pass
>>     return url_to_content
>>
>> Could be parallelized as:
>>
>> # Making this a global variable used any many functions ensures that
>> # the global thread count is kept under control.
>> executor = futures.ThreadPoolExecutor(50)
>> def download_urls(urls, timeout=60):
>>     url_to_content = {}
>>     # Run load_url for every url and get the result as a FuturesList.
>>     fs = executor.run_to_futures(
>>             (functools.partial(load_url, url, timeout) for url in urls),
>>             timeout=timeout)
>>     for url, future in zip(urls, fs.successful_futures()):
>>         url_to_content[url] = future.result()
>>     return url_to_content
>>
>>
>> The Python 3.0+ code is here:
>> http://code.google.com/p/pythonfutures/source
>>
>> Any feedback on the API would be very much appreciated!
>>
>> Cheers,
>> Brian
>>
>>



From showell30 at yahoo.com  Sun May 10 12:49:46 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 10 May 2009 09:49:46 -0700 (PDT)
Subject: help with recursive whitespace filter in
References: <mailman.5380.1241971815.11746.python-list@python.org>
Message-ID: <53fc8859-5254-4f49-94f3-c6c430d77371@z5g2000vba.googlegroups.com>

On May 10, 9:10?am, Rustom Mody <rustompm... at gmail.com> wrote:
> I am trying to write a recursive filter to remove whitespace-only
> nodes for minidom.
> The code is below.
>
> Strangely it deletes some whitespace nodes and leaves some.
> If I keep calling it -- like so: fws(fws(fws(doc))) ?then at some
> stage all the ws nodes disappear
>
> Does anybody have a clue?
>
> from xml.dom.minidom import parse
>
> #The input to fws is the output of parse("something.xml")
>
> def fws(ele):
> ? ? """ filter white space (recursive)"""
>
> ? ?for c in ele.childNodes:
> ? ? ? ? if isWsNode(c):
> ? ? ? ? ? ? ele.removeChild(c)
> ? ? ? ? ? ? #c.unlink() Makes no diff whether this is there or not
> ? ? ? ? elif c.nodeType == ele.ELEMENT_NODE:
> ? ? ? ? ? ? fws(c)
>
> def isWsNode(ele):
> ? ? return (ele.nodeType == ele.TEXT_NODE and not ele.data.strip())

I would avoid doing things like delete/remove in a loop.  Instead
build a list of things to delete.


From andreengels at gmail.com  Sun May 10 12:56:52 2009
From: andreengels at gmail.com (Andre Engels)
Date: Sun, 10 May 2009 18:56:52 +0200
Subject: Q's on my first python script
In-Reply-To: <0216ec41$0$20647$c3e8da3@news.astraweb.com>
References: <gu6im5$1hi$1@reader1.panix.com>
	<0216ec41$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <6faf39c90905100956ya8666c6rc9236837db0edf0d@mail.gmail.com>

On Sun, May 10, 2009 at 5:56 PM, Steven D'Aprano
<steve at remove-this-cybersource.com.au> wrote:

>> 5. The variable wd is meant to be "global" to the script. ?In other
>> ? ?languages I've programmed in I've seen some typographic convention
>> ? ?used for the name of such variables (e.g. all caps) to signal this
>> ? ?widened scope. ?Does python have such a convention?
>
> As a general rule, it's best to avoid globals variables as much as
> possible.

However, this is not really a global variable, this is a constant,
which is not something to be avoided, nor something that there is a
convention for (as far as I know).


-- 
Andr? Engels, andreengels at gmail.com


From allenreas at gmail.com  Sun May 10 13:04:04 2009
From: allenreas at gmail.com (AllenLars)
Date: Sun, 10 May 2009 10:04:04 -0700 (PDT)
Subject: Downloading most recently modified files
In-Reply-To: <2dc0c81b0905071336l365f6b3aq51761873b52e38d0@mail.gmail.com>
References: <23432457.post@talk.nabble.com>
	<2dc0c81b0905071336l365f6b3aq51761873b52e38d0@mail.gmail.com>
Message-ID: <23471969.post@talk.nabble.com>


Thanks Shawn.  I went through the ftplib info and I was able to generate a
list.  I am needing to figure out parsing the list. 

AllenLars

Shawn Milochik wrote:
> 
> On Thu, May 7, 2009 at 2:19 PM, AllenLars <allenreas at gmail.com> wrote:
>>
>> I am trying to code a script that will allow me to go to ftp site and
>> download files based on most recently modified file (date, time). ?I am
>> brand new to programming. ?Any and all help is appreciated.
>> --<snip>
> 
> 
> I've actually written code to do this, and it's fairly easy. Just use
> the FTP module to run the "ls" (directory listing) command and parse
> the results to get the filenames and timestamps. Then you will be able
> to easily do download requests for the file(s) you want.
> 
> Perhaps someone else on the list can chime in with a more elegant
> solution.
> 
> Here's enough to get you started:
> 
> from ftplib import FTP   #(http://docs.python.org/library/ftplib.html)
> 
> ShawnMilo
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
> 

-- 
View this message in context: http://www.nabble.com/Downloading-most-recently-modified-files-tp23432457p23471969.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From Scott.Daniels at Acm.Org  Sun May 10 13:06:04 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 10 May 2009 10:06:04 -0700
Subject: import overwrites __name__
In-Reply-To: <m2skjddmdh.fsf@cs.uu.nl>
References: <gu1pad$afi$1@ger.gmane.org>
	<mailman.5361.1241924171.11746.python-list@python.org>
	<gu600c$pvt$00$1@news.t-online.com> <m2skjddmdh.fsf@cs.uu.nl>
Message-ID: <pqedne2OjKvYlZrXnZ2dnUVZ_omdnZ2d@pdx.net>

Piet van Oostrum wrote:
>>>>>> Peter Otten <__peter__ at web.de> (PO) wrote:
> 
>> PO> $ cat x.py
>> PO> import sys
>> PO> globals().update(zip(*(range(110),)*2))
>> PO> y = 42
>> PO> print __name__
>> PO> if __name__ == "__main__":
>> PO>     a = b = 42
>> PO> print len(dir())
>> PO> from x import y as z
>> PO> try:
>> PO>     print my_name
>> PO> except NameError, e:
>> PO>     print 'unhandled NameError: "%s"' % e
>> PO>     sys.exit()
> 
>> PO> $ python x.py
>> PO> __main__
>> PO> 119
>> PO> x
>> PO> 117
>> PO> unhandled NameError: "name 'my_name' is not defined"
> 
> This is perfectly normal. python x.py command runs normally (although
> the globals().update is a very weird thing to do), until the from x
> import y command. Then x.py is loaded again but now as the module 'x'
> instead of '__main__'. Python doesn't know it's the same file, and
> actually it doesn't want to know. It only knows it when you do import
> twice on the same file. Not when you run it as a main script first and
> then imports it. **This is a thing you shouldn't do**.
> There are now two namespaces: one for __main__ and one for x. These are
> distinct and have no relationship. 
> 
> The reason that the first number is 119 and the second is 117 is that
> while importing x the variables a and b are not created.
After a bit more boiling down:

x.py:

import sys
y = 42
if __name__ == "__main__":
     a = b = 42
print __name__, 'size', len(dir())
from x import y as z
print __name__, 'size', len(dir()), 'completed import of', z
try:
     print my_name
except NameError, e:
     print '%s found unhandled NameError: "%s"' % (__name__, e)
     sys.exit()

produces:
__main__
__main__ size 8
x
x size 6
x size 7 completed import of 42
x found unhandled NameError: "name 'my_name' is not defined"

--Scott David Daniels
Scott.Daniels at Acm.Org


From rtomek at ceti.com.pl  Sun May 10 13:08:47 2009
From: rtomek at ceti.com.pl (Tomasz Rola)
Date: Sun, 10 May 2009 19:08:47 +0200 (CEST)
Subject: Nimrod programming language
In-Reply-To: <159308160@web.de>
References: <159308160@web.de>
Message-ID: <Pine.LNX.4.64.0905101836020.7447@tau.ceti.pl>

On Fri, 8 May 2009, Andreas Rumpf wrote:

> Dear Python-users,
> 
> I invented a new programming language called "Nimrod" that combines 
> Python's readability with C's performance. Please check it out: 
> http://force7.de/nimrod/ 
> Any feedback is appreciated.
> 
> Regards,
> Andreas Rumpf

Interesting.

One question I ask myself upon seeing a new language is if it is possible 
to program amb (amb=ambiguous) operator in it. This page gives a very 
nice, "code first" explanation of amb and how it is supposed to work:

http://www.randomhacks.net/articles/2005/10/11/amb-operator

I am not sure if this kind of extension is doable in your Nimrod. Perhaps 
it can be somewhat extrapolated from docs, but at the moment I have no 
time to do this (and could not google anything interesting).

As can be seen on the page mentioned, in Ruby this seems to be quite light 
and effortless. From what I know about Python, it is either hard or 
impractical (to the point of being impossible) to write amb in it.

Two additional notes regarding amb:

1. Even if Nimrod cannot support amb in an elegant way, it is still nice 
idea. Especially if you can make it to be kind of Python superset, so that 
Python programmer can cross the boundary between the two without much 
hassle (and maybe in both directions). Of course, not everything can be 
copied.

2. The amb itself is not really important so much, and I may never feel 
any need to actually use it. But it stroke me how nice it was looking in 
Ruby, even if I finally decided not to learn Ruby (not in this year, at 
least).

In Scheme, it is a bit more hackish, but still looks nice, at least to me:

http://www.ccs.neu.edu/home/dorai/t-y-scheme/t-y-scheme-Z-H-16.html#node_chap_14
http://planet.plt-scheme.org/package-source/murphy/amb.plt/1/0/planet-docs/amb/index.html

Anyway, I think amb is quite a test of a language. If you can do it, 
please show the code.

Regards,
Tomasz Rola

--
** A C programmer asked whether computer had Buddha's nature.      **
** As the answer, master did "rm -rif" on the programmer's home    **
** directory. And then the C programmer became enlightened...      **
**                                                                 **
** Tomasz Rola          mailto:tomasz_rola at bigfoot.com             **


From Scott.Daniels at Acm.Org  Sun May 10 13:09:29 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 10 May 2009 10:09:29 -0700
Subject: Wrapping comments
In-Reply-To: <0216b85e$0$20647$c3e8da3@news.astraweb.com>
References: <towb-EA7906.14423909052009@news.individual.de>	<gu55va$uba$2@lust.ihug.co.nz>
	<vaSdncdMGoQ_gZvXnZ2dnUVZ_vqdnZ2d@pdx.net>	<gu5bbr$1ua$1@lust.ihug.co.nz>
	<0216b85e$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <pqedneyOjKuPlJrXnZ2dnUVZ_omdnZ2d@pdx.net>

Steven D'Aprano wrote:
> On Sun, 10 May 2009 13:41:15 +1200, Lawrence D'Oliveiro wrote:
>> If I had to print out all the code and documentation I have to look at,
>> I'd need to add another room to my house.
> 
> You are allowed to throw it away when you're done with it :)

Except here in Portland, where you'd better recycle it. ;)

--Scott David Daniels
Scott.Daniels at Acm.Org


From drobinow at gmail.com  Sun May 10 13:16:52 2009
From: drobinow at gmail.com (David Robinow)
Date: Sun, 10 May 2009 13:16:52 -0400
Subject: Wrapping comments
In-Reply-To: <towb-63CE3D.09322210052009@news.individual.de>
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
Message-ID: <4eb0089f0905101016x13dc34fp2eb0ec2b241f1c80@mail.gmail.com>

On Sun, May 10, 2009 at 3:32 AM, Tobias Weber <towb at gmx.net> wrote:
> In article <m2bpq2ngup.fsf at googlemail.com>,
> ?Arnaud Delobelle <arnodel at googlemail.com> wrote:
>
>> A simple Alt-Q will reformat everything nicely.
>
> Now that's something. Thanks!
>
> (still not gonna use software that doesn't let me type # because it's
> alt+3 on a UK layout; having to re-learn or configure that is just sick)
>
 Put the following in your .emacs file:

(define-key key-translation-map [?\M-3] "#")


or, if you prefer, just be sick.


From martin at v.loewis.de  Sun May 10 13:18:16 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 10 May 2009 19:18:16 +0200
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
References: <49D4DA72.60401@v.loewis.de>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB22B5.3040507@simplistix.co.uk>	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>	<4A0590C4.1020904@v.loewis.de>	<20090509143829.17F293A4080@sparrow.telecommunity.com>	<4A059639.7040505@v.loewis.de>	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
Message-ID: <4A070C58.4070003@v.loewis.de>

> GNU stow does handle these issues.

If GNU stow solves all your problems, why do you want to
use easy_install in the first place?

Regards,
Martin


From rustompmody at gmail.com  Sun May 10 13:23:29 2009
From: rustompmody at gmail.com (rustom)
Date: Sun, 10 May 2009 10:23:29 -0700 (PDT)
Subject: help with recursive whitespace filter in
References: <mailman.5380.1241971815.11746.python-list@python.org> 
	<53fc8859-5254-4f49-94f3-c6c430d77371@z5g2000vba.googlegroups.com>
Message-ID: <0291fad2-a744-4ced-bcd4-fb8529e968b8@x29g2000prf.googlegroups.com>

On May 10, 9:49?pm, Steve Howell <showel... at yahoo.com> wrote:
> On May 10, 9:10?am, Rustom Mody <rustompm... at gmail.com> wrote:
>
>
>
> > I am trying to write a recursive filter to remove whitespace-only
> > nodes for minidom.
> > The code is below.
>
> > Strangely it deletes some whitespace nodes and leaves some.
> > If I keep calling it -- like so: fws(fws(fws(doc))) ?then at some
> > stage all the ws nodes disappear
>
> > Does anybody have a clue?
>
> > from xml.dom.minidom import parse
>
> > #The input to fws is the output of parse("something.xml")
>
> > def fws(ele):
> > ? ? """ filter white space (recursive)"""
>
> > ? ?for c in ele.childNodes:
> > ? ? ? ? if isWsNode(c):
> > ? ? ? ? ? ? ele.removeChild(c)
> > ? ? ? ? ? ? #c.unlink() Makes no diff whether this is there or not
> > ? ? ? ? elif c.nodeType == ele.ELEMENT_NODE:
> > ? ? ? ? ? ? fws(c)
>
> > def isWsNode(ele):
> > ? ? return (ele.nodeType == ele.TEXT_NODE and not ele.data.strip())
>
> I would avoid doing things like delete/remove in a loop. ?Instead
> build a list of things to delete.

Yeah I know. I would write the whole damn thing functionally if I knew
how.  But cant figure out the API.
I actually started out to write a (haskell-style) copy out the whole
tree minus the unwanted nodes but could not figure it out


From Scott.Daniels at Acm.Org  Sun May 10 13:31:54 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 10 May 2009 10:31:54 -0700
Subject: Q's on my first python script
In-Reply-To: <0216ec41$0$20647$c3e8da3@news.astraweb.com>
References: <gu6im5$1hi$1@reader1.panix.com>
	<0216ec41$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <U6qdnWYosYnOk5rXnZ2dnUVZ_j6dnZ2d@pdx.net>

Steven D'Aprano wrote:
> On Sun, 10 May 2009 12:52:21 +0000, kj wrote:
> ....
>> 5. The variable wd is meant to be "global" to the script.  In other
>>    languages I've programmed in I've seen some typographic convention
>>    used for the name of such variables (e.g. all caps) to signal this
>>    widened scope.  Does python have such a convention?
> 
> As a general rule, it's best to avoid globals variables as much as 
> possible.
> 
> One convention I occasionally use is to prefix global variables with a 
> lowercase g. And then ruthlessly refactor my code until any variable 
> starting with a lowercase g is removed :)

You (the OP) don't seem to know about PEP 8, which advises 4-space
indents, all-caps constants, and many more style specifics.
     http://www.python.org/dev/peps/pep-0008/

--Scott David Daniels
Scott.Daniels at Acm.Org


From google at mrabarnett.plus.com  Sun May 10 13:35:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 10 May 2009 18:35:59 +0100
Subject: help with recursive whitespace filter in
In-Reply-To: <0291fad2-a744-4ced-bcd4-fb8529e968b8@x29g2000prf.googlegroups.com>
References: <mailman.5380.1241971815.11746.python-list@python.org>
	<53fc8859-5254-4f49-94f3-c6c430d77371@z5g2000vba.googlegroups.com>
	<0291fad2-a744-4ced-bcd4-fb8529e968b8@x29g2000prf.googlegroups.com>
Message-ID: <4A07107F.5000703@mrabarnett.plus.com>

rustom wrote:
> On May 10, 9:49 pm, Steve Howell <showel... at yahoo.com> wrote:
>> On May 10, 9:10 am, Rustom Mody <rustompm... at gmail.com> wrote:
>>
>>
>>
>>> I am trying to write a recursive filter to remove whitespace-only
>>> nodes for minidom.
>>> The code is below.
>>> Strangely it deletes some whitespace nodes and leaves some.
>>> If I keep calling it -- like so: fws(fws(fws(doc)))  then at some
>>> stage all the ws nodes disappear
>>> Does anybody have a clue?
>>> from xml.dom.minidom import parse
>>> #The input to fws is the output of parse("something.xml")
>>> def fws(ele):
>>>     """ filter white space (recursive)"""
>>>    for c in ele.childNodes:
>>>         if isWsNode(c):
>>>             ele.removeChild(c)
>>>             #c.unlink() Makes no diff whether this is there or not
>>>         elif c.nodeType == ele.ELEMENT_NODE:
>>>             fws(c)
>>> def isWsNode(ele):
>>>     return (ele.nodeType == ele.TEXT_NODE and not ele.data.strip())
>> I would avoid doing things like delete/remove in a loop.  Instead
>> build a list of things to delete.
> 
> Yeah I know. I would write the whole damn thing functionally if I knew
> how.  But cant figure out the API.
> I actually started out to write a (haskell-style) copy out the whole
> tree minus the unwanted nodes but could not figure it out
> 
def fws(ele):
     """ filter white space (recursive)"""
     empty_nodes = []
     for c in ele.childNodes:
         if isWsNode(c):
             empty_nodes.append(c)
         elif c.nodeType == ele.ELEMENT_NODE:
             fws(c)
     for c in empty_nodes:
         ele.removeChild(c)


From google at mrabarnett.plus.com  Sun May 10 13:37:56 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 10 May 2009 18:37:56 +0100
Subject: Q's on my first python script
In-Reply-To: <6faf39c90905100956ya8666c6rc9236837db0edf0d@mail.gmail.com>
References: <gu6im5$1hi$1@reader1.panix.com>	<0216ec41$0$20647$c3e8da3@news.astraweb.com>
	<6faf39c90905100956ya8666c6rc9236837db0edf0d@mail.gmail.com>
Message-ID: <4A0710F4.1070807@mrabarnett.plus.com>

Andre Engels wrote:
> On Sun, May 10, 2009 at 5:56 PM, Steven D'Aprano
> <steve at remove-this-cybersource.com.au> wrote:
> 
>>> 5. The variable wd is meant to be "global" to the script.  In other
>>>    languages I've programmed in I've seen some typographic convention
>>>    used for the name of such variables (e.g. all caps) to signal this
>>>    widened scope.  Does python have such a convention?
>> As a general rule, it's best to avoid globals variables as much as
>> possible.
> 
> However, this is not really a global variable, this is a constant,
> which is not something to be avoided, nor something that there is a
> convention for (as far as I know).
> 
In Python the convention for constants is CAPS_WITH_UNDERSCORES.


From Scott.Daniels at Acm.Org  Sun May 10 13:53:02 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 10 May 2009 10:53:02 -0700
Subject: help with recursive whitespace filter in
In-Reply-To: <mailman.5380.1241971815.11746.python-list@python.org>
References: <mailman.5380.1241971815.11746.python-list@python.org>
Message-ID: <k8idnYXf3ILbjprXnZ2dnUVZ_qqdnZ2d@pdx.net>

Rustom Mody wrote:
> I am trying to write a recursive filter to remove whitespace-only
> nodes for minidom.
> The code is below.
> 
> Strangely it deletes some whitespace nodes and leaves some.
> If I keep calling it -- like so: fws(fws(fws(doc)))  then at some
> stage all the ws nodes disappear
> 
> Does anybody have a clue?

Yup, don't stand on the limb you are sawing off.

> def fws(ele):
...
>    for c in ele.childNodes:
>         if isWsNode(c):
>             ele.removeChild(c)
...
At the very least:
      for c in reversed(ele.childNodes):
           if isWsNode(c):
               ele.removeChild(c)

--Scott David Daniels
Scott.Daniels at Acm.Org


From __peter__ at web.de  Sun May 10 13:59:18 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 10 May 2009 19:59:18 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org>
	<mailman.5361.1241924171.11746.python-list@python.org>
	<gu600c$pvt$00$1@news.t-online.com> <m2skjddmdh.fsf@cs.uu.nl>
Message-ID: <gu74ld$cii$02$1@news.t-online.com>

Piet van Oostrum wrote:

>>>>>> Peter Otten <__peter__ at web.de> (PO) wrote:
> 
>>PO> $ cat x.py
>>PO> import sys
>>PO> globals().update(zip(*(range(110),)*2))
>>PO> y = 42
>>PO> print __name__
>>PO> if __name__ == "__main__":
>>PO>     a = b = 42
>>PO> print len(dir())
>>PO> from x import y as z
>>PO> try:
>>PO>     print my_name
>>PO> except NameError, e:
>>PO>     print 'unhandled NameError: "%s"' % e
>>PO>     sys.exit()
> 
>>PO> $ python x.py
>>PO> __main__
>>PO> 119
>>PO> x
>>PO> 117
>>PO> unhandled NameError: "name 'my_name' is not defined"
> 
> This is perfectly normal. 

I'm not 100% sure of that.

Just in case you didn't notice: I'm not the OP. The above piece of junk code 
was my attempt to keep as close to the code he posted while producing the 
same output that he got.

> python x.py command runs normally (although
> the globals().update is a very weird thing to do), until the from x
> import y command. Then x.py is loaded again but now as the module 'x'
> instead of '__main__'. Python doesn't know it's the same file, and
> actually it doesn't want to know. It only knows it when you do import
> twice on the same file. Not when you run it as a main script first and
> then imports it. **This is a thing you shouldn't do**.
> There are now two namespaces: one for __main__ and one for x. These are
> distinct and have no relationship.
> 
> The reason that the first number is 119 and the second is 117 is that
> while importing x the variables a and b are not created.

Your explanation is of course between 119 and 117% correct while I was only 
99% serious...

Cheers,
Peter



From zooko at zooko.com  Sun May 10 14:04:57 2009
From: zooko at zooko.com (Zooko Wilcox-O'Hearn)
Date: Sun, 10 May 2009 12:04:57 -0600
Subject: how GNU stow is complementary rather than alternative to distutils
In-Reply-To: <4A070C58.4070003@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB22B5.3040507@simplistix.co.uk>	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>	<4A0590C4.1020904@v.loewis.de>	<20090509143829.17F293A4080@sparrow.telecommunity.com>	<4A059639.7040505@v.loewis.de>	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
	<4A070C58.4070003@v.loewis.de>
Message-ID: <B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>

On May 10, 2009, at 11:18 AM, Martin v. L?wis wrote:

> If GNU stow solves all your problems, why do you want to use  
> easy_install in the first place?

That's a good question.  The answer is that there are two separate  
jobs: building executables and putting them in a directory structure  
of the appropriate shape for your system is one job, and installing  
or uninstalling that tree into your system is another.  GNU stow does  
only the latter.

The input to GNU stow is a set of executables, library files, etc.,  
in a directory tree that is of the right shape for your system.  For  
example, if you are on a Linux system, then your scripts all need to  
be in $prefix/bin/, your shared libs should be in $prefix/lib, your  
Python packages ought to be in $prefix/lib/python$x.$y/site- 
packages/, etc.  GNU stow is blissfully ignorant about all issues of  
building binaries, and choosing where to place files, etc. -- that's  
the job of the build system of the package, e.g. the "./configure -- 
prefix=foo && make && make install" for most C packages, or the  
"python ./setup.py install --prefix=foo" for Python packages using  
distutils (footnote 1).

Once GNU stow has the well-shaped directory which is the output of  
the build process, then it follows a very dumb, completely reversible  
(uninstallable) process of symlinking those files into the system  
directory structure.

It is a beautiful, elegant hack because it is sooo dumb.  It is also  
very nice to use the same tool to manage packages written in any  
programming language, provided only that they can build a directory  
tree of the right shape and content.

However, there are lots of things that it doesn't do, such as  
automatically acquiring and building dependencies, or producing  
executables for the target platform for each of your console  
scripts.  Not to mention creating a directory named "$prefx/lib/python 
$x.$y/site-packages" and cp'ing your Python files into it.  That's  
why you still need a build system even if you use GNU stow for an  
install-and-uninstall system.

The thing that prevents this from working with setuptools is that  
setuptools creates a file named easy_install.pth during the "python ./ 
setup.py install --prefix=foo" if you build two different Python  
packages this way, they will each create an easy_install.pth file,  
and then when you ask GNU stow to link the two resulting packages  
into your system, it will say "You are asking me to install two  
different packages which both claim that they need to write a file  
named '/usr/local/lib/python2.5/site-packages/easy_install.pth'.  I'm  
too dumb to deal with this conflict, so I give up.".  If I understand  
correctly, your (MvL's) suggestion that easy_install create a .pth  
file named "easy_install-$PACKAGE-$VERSION.pth" instead of  
"easy_install.pth" would indeed make it work with GNU stow.

Regards,

Zooko

footnote 1: Aside from the .pth file issue, the other reason that  
setuptools doesn't work for this use while distutils does is that  
setuptools tries to hard to save you from making a mistake: maybe you  
don't know what you are doing if you ask it to install into a  
previously non-existent prefix dir "foo".  This one is easier to fix:  
http://bugs.python.org/setuptools/issue54 # "be more like distutils  
with regard to --prefix=" .

From kay at fiber-space.de  Sun May 10 14:05:49 2009
From: kay at fiber-space.de (kay at fiber-space.de)
Date: Sun, 10 May 2009 11:05:49 -0700 (PDT)
Subject: php to python code converter
References: <mailman.5292.1241795959.11746.python-list@python.org>
Message-ID: <1ca12653-4c28-48f1-bf17-def74a89ef15@h23g2000vbc.googlegroups.com>

On 8 Mai, 17:19, Pascal Chambon <chambon.pas... at gmail.com> wrote:
> Hello
>
> That's funny, I was precisely thinking about a php to python converter,
> some weeks ago.
> Such a tool, allowing for example to convert some CMS like Drupal to
> python, would be a killer app, when we consider the amount of php code
> available.
>
> But of course, there are lots of issues that'd have to be fixed :
> - translating the php syntax to python syntax
> - forcing scope limitations where php doesn't have any
> - handling differences in semantics (for example, the booleanness of "0"
> or)
> - handling the automatic variable creation and coertion that php features
> - handling the php types like arrays (which are neither python lists nor
> python dicts)
> - providing a whole mirror of the php stdlib (string and file functions,
> access to environment vars...)

Some thoughts.

1) Syntax. Not a big deal.

2) Semantics. My favourite approach was to create a Python framework
that represents PHP in Python and enables round-trips. So one could
translate forth and back. Python code that is compliant to the
conventions of the framework can also be translated to PHP and for
each PHP program P following equation holds:

   py2php(php2py(P)) = P

This makes readable code mandatory.

3) PHP stdlib via C bindings ( ctypes? )

4) Corner cases of bindings: cut them off. Not everything has to be
translated. But produce stubs that raise NotImplementedError
exceptions.

Same arguments apply to Javascript. Not sure about Ruby but I do think
a parser is feasible despite context sensitivities. Ruby is not my
concern though.

Personally I'd be interested in Wordpress which I like and use.

Kay


From davea at ieee.org  Sun May 10 14:21:03 2009
From: davea at ieee.org (Dave Angel)
Date: Sun, 10 May 2009 14:21:03 -0400
Subject: import overwrites __name__
In-Reply-To: <pqedne2OjKvYlZrXnZ2dnUVZ_omdnZ2d@pdx.net>
References: <gu1pad$afi$1@ger.gmane.org>	<mailman.5361.1241924171.11746.python-list@python.org>	<gu600c$pvt$00$1@news.t-online.com>
	<m2skjddmdh.fsf@cs.uu.nl>
	<pqedne2OjKvYlZrXnZ2dnUVZ_omdnZ2d@pdx.net>
Message-ID: <4A071B0F.2020206@ieee.org>

Scott David Daniels wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">Piet van 
> Oostrum wrote:
>>>>>>> Peter Otten <__peter__ at web.de> (PO) wrote:
>>
>>> PO> $ cat x.py
>>> PO> import sys
>>> PO> globals().update(zip(*(range(110),)*2))
>>> PO> y = 42
>>> PO> print __name__
>>> PO> if __name__ == "__main__":
>>> PO>     a = b = 42
>>> PO> print len(dir())
>>> PO> from x import y as z
>>> PO> try:
>>> PO>     print my_name
>>> PO> except NameError, e:
>>> PO>     print 'unhandled NameError: "%s"' % e
>>> PO>     sys.exit()
>>
>>> PO> $ python x.py
>>> PO> __main__
>>> PO> 119
>>> PO> x
>>> PO> 117
>>> PO> unhandled NameError: "name 'my_name' is not defined"
>>
>> This is perfectly normal. python x.py command runs normally (although
>> the globals().update is a very weird thing to do), until the from x
>> import y command. Then x.py is loaded again but now as the module 'x'
>> instead of '__main__'. Python doesn't know it's the same file, and
>> actually it doesn't want to know. It only knows it when you do import
>> twice on the same file. Not when you run it as a main script first and
>> then imports it. **This is a thing you shouldn't do**.
>> There are now two namespaces: one for __main__ and one for x. These are
>> distinct and have no relationship.
>> The reason that the first number is 119 and the second is 117 is that
>> while importing x the variables a and b are not created.
> After a bit more boiling down:
>
> x.py:
>
> import sys
> y = 42
> if __name__ == "__main__":
>     a = b = 42
> print __name__, 'size', len(dir())
> from x import y as z
> print __name__, 'size', len(dir()), 'completed import of', z
> try:
>     print my_name
> except NameError, e:
>     print '%s found unhandled NameError: "%s"' % (__name__, e)
>     sys.exit()
>
> produces:
> __main__
> __main__ size 8
> x
> x size 6
> x size 7 completed import of 42
> x found unhandled NameError: "name 'my_name' is not defined"
>
> --Scott David Daniels
> Scott.Daniels at Acm.Org
>
> </div>
>
I already said this before - don't ever import the file you're using as 
a script.  Now that we have real names for these files, I can say it 
more strongly.

If you use "import x"    or its variant "from x import..."   then *DO 
NOT* run x.py as your main script.

You must have a separate script file that you run, and that nobody tries 
to import.

Now, once you get past that problem, you'll probably have others.  Why 
on earth would you try to import a module from itself? The line:
   from x import y as z

is probably equivalent to  z=y




From martin at v.loewis.de  Sun May 10 14:21:48 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 10 May 2009 20:21:48 +0200
Subject: how GNU stow is complementary rather than alternative to distutils
In-Reply-To: <B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
References: <49D4DA72.60401@v.loewis.de>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB22B5.3040507@simplistix.co.uk>	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>	<4A0590C4.1020904@v.loewis.de>	<20090509143829.17F293A4080@sparrow.telecommunity.com>	<4A059639.7040505@v.loewis.de>	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
	<4A070C58.4070003@v.loewis.de>
	<B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
Message-ID: <4A071B3C.2060808@v.loewis.de>

Zooko Wilcox-O'Hearn wrote:
> On May 10, 2009, at 11:18 AM, Martin v. L?wis wrote:
> 
>> If GNU stow solves all your problems, why do you want to use
>> easy_install in the first place?
> 
> That's a good question.  The answer is that there are two separate jobs:
> building executables and putting them in a directory structure of the
> appropriate shape for your system is one job, and installing or
> uninstalling that tree into your system is another.  GNU stow does only
> the latter.

And so does easy_install - it's job is *not* to build the executables
and to put them in a directory structure. Instead, it's
distutils/setuptools which has this job.

The primary purpose of easy_install is to download the files from PyPI
(IIUC).

> The thing that prevents this from working with setuptools is that
> setuptools creates a file named easy_install.pth

It will stop doing that if you ask nicely. That's why I recommended
earlier that you do ask it not to edit .pth files.

> If I understand correctly,
> your (MvL's) suggestion that easy_install create a .pth file named
> "easy_install-$PACKAGE-$VERSION.pth" instead of "easy_install.pth" would
> indeed make it work with GNU stow.

My recommendation is that you use the already existing flag to
setup.py install that stops it from editing .pth files.

Regards,
Martin


From zookog at gmail.com  Sun May 10 14:21:57 2009
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Sun, 10 May 2009 12:21:57 -0600
Subject: [Python-Dev] how GNU stow is complementary rather than 
	alternative to distutils
In-Reply-To: <B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
References: <49D4DA72.60401@v.loewis.de> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<4A059639.7040505@v.loewis.de>
	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
	<4A070C58.4070003@v.loewis.de>
	<B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
Message-ID: <cd6401a0905101121r68f09fe5q8d627146d15a7440@mail.gmail.com>

following-up to my own post to mention one very important reason why
anyone cares:

On Sun, May 10, 2009 at 12:04 PM, Zooko Wilcox-O'Hearn <zooko at zooko.com> wrote:

> It is a beautiful, elegant hack because it is sooo dumb. ?It is also very
> nice to use the same tool to manage packages written in any programming
> language, provided only that they can build a directory tree of the right
> shape and content.

And, you are not relying on the author of the package that you are
installing to avoid accidentally or maliciously screwing up your
system.  You're not even relying on the authors of the *build system*
(e.g. the authors of distutils or easy_install).  You are relying
*only* on GNU stow to avoid accidentally or maliciously screwing up
your system, and GNU stow is very dumb, so it is easy to understand
what it is going to do and why that isn't going to irreversibly screw
up your system.

That is: you don't run the "build yourself and install into $prefix"
step as root.  This is an important consideration for a lot of people,
who absolutely refuse on principle to ever run "sudo python
./setup.py" on a system that they care about unless they wrote the
"setup.py" script themselves.  (Likewise they refuse to run "sudo make
install" on packages written in C.)

Regards,

Zooko


From pje at telecommunity.com  Sun May 10 14:48:46 2009
From: pje at telecommunity.com (P.J. Eby)
Date: Sun, 10 May 2009 14:48:46 -0400
Subject: how GNU stow is complementary rather than alternative to distutils
In-Reply-To: <B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<4A059639.7040505@v.loewis.de>
	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
	<4A070C58.4070003@v.loewis.de>
	<B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
Message-ID: <20090510184609.D238E3A4061@sparrow.telecommunity.com>

At 12:04 PM 5/10/2009 -0600, Zooko Wilcox-O'Hearn wrote:
>The thing that prevents this from working with setuptools is that
>setuptools creates a file named easy_install.pth during the "python 
>./ setup.py install --prefix=foo" if you build two different Python
>packages this way, they will each create an easy_install.pth file,
>and then when you ask GNU stow to link the two resulting packages
>into your system, it will say "You are asking me to install two
>different packages which both claim that they need to write a file
>named '/usr/local/lib/python2.5/site-packages/easy_install.pth'.

Adding --record and --single-version-externally-managed to that 
command line will prevent the .pth file from being used or needed, 
although I believe you already know this.

(What that mode won't do is install dependencies automatically.) 



From piet at cs.uu.nl  Sun May 10 14:52:07 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 10 May 2009 20:52:07 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org>
	<mailman.5361.1241924171.11746.python-list@python.org>
	<gu600c$pvt$00$1@news.t-online.com> <m2skjddmdh.fsf@cs.uu.nl>
	<gu74ld$cii$02$1@news.t-online.com>
Message-ID: <m2ocu0eqp4.fsf@cs.uu.nl>

>>>>> Peter Otten <__peter__ at web.de> (PO) wrote:

>PO> Piet van Oostrum wrote:
>>> 
>>> This is perfectly normal. 

>PO> I'm not 100% sure of that.

Why not?

>PO> Just in case you didn't notice: I'm not the OP. The above piece of junk code 
>PO> was my attempt to keep as close to the code he posted while producing the 
>PO> same output that he got.

Sorry about that. I was confused because your code was a response tp

> You'd have to show us the module. Try to make the smallest module that
> has the same effect.

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From aahz at pythoncraft.com  Sun May 10 15:30:40 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 May 2009 12:30:40 -0700
Subject: FLV download script works, but I want to enhance it
References: <mailman.5134.1241579669.11746.python-list@python.org>
	<gtur8q$b2n$1@panix3.panix.com>
	<mailman.5307.1241805968.11746.python-list@python.org>
Message-ID: <gu7a10$sot$1@panix3.panix.com>

In article <mailman.5307.1241805968.11746.python-list at python.org>,
The Music Guy  <musicguy at alphaios.net> wrote:
>On Thu, May 7, 2009 at 9:29 AM, Aahz <aahz at pythoncraft.com> wrote:
>>
>> Here's my download script to get you started figuring this out, it does
>> the wget in the background so that several downloads can run in parallel
>> from a single terminal window:
>>
>> #!/bin/bash
>>
>> echo "Downloading $1"
>> wget "$1" > /dev/null 2>&1 &
>
>Thanks for the reply, but unfortunately that script is going in the
>complete wrong direction.

Not really; my point was that you could use something similar to process
files after downloading.

>Firstly, downloading multiple files in tandem does not speed up the
>process as it merely cuts up the already limited bandwidth into even
>smaller pieces and delays every download in progress. It is much
>better to queue downloads to occur one-by-one.
>
>Secondly, that approach is based on bash rather than Python. I know I
>could use the `&` operator on a command line to background processes,
>but I would like to be able to have more control through Python and
>the use of the subprocess or threading modules.

Threading probably won't get you anywhere; I bet processing the files is
CPU-intensive.  I suggest looking into the multiprocessing module, which
would then run the file processing.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From davea at ieee.org  Sun May 10 15:33:31 2009
From: davea at ieee.org (Dave Angel)
Date: Sun, 10 May 2009 15:33:31 -0400
Subject: Q's on my first python script
In-Reply-To: <gu6im5$1hi$1@reader1.panix.com>
References: <gu6im5$1hi$1@reader1.panix.com>
Message-ID: <4A072C0B.2@ieee.org>



kj wrote:
> Below is my very firs python script.
>
> This was just a learning exercise; the script doesn't do anything
> terribly exciting: for an argument of the form YYMMDD (year, month,
> day) it prints out the corresponding string YYMMDDW, where W is a
> one-letter abbreviation for the day of the week.  E.g.
>
> % wd 090511
> 090511M
>
> The script runs OK, but I can still see a few areas of improvement,
> for which I could use your advice.
>
> 1. The name of the BadArgument exception class defined in the script
>    does not seem to me sufficiently specific.  If one were to import
>    the script in order to reuse its wkday_abbrev function, I'd like
>    this exception's name to be more unequivocally tied to this
>    script.  What I'm looking for is something like a "namespace"
>    for this script.  What's the pythonic way to construct a namespace?
>
> 2. In some python modules I've seen the idiom
>
>    if __name__ == "__main__":
>       # run some tests here
>
>    I'd like to set up tests for this script, mostly to ensure that
>    it handles the error cases properly, but I'm alread using the
>    idiom above to actually run the script under normal operation.
>    What's the typical python idiom for running tests on a *script*
>    (as opposed to a module that is normally not supposed to be run
>    directly)?
>
> 3. Still on the subject of testing, how does one capture in a
>    variable the output that would normally have gone to stdout or
>    stderr?
>
> 4. What's the python way to emit warnings?  (The script below should
>    warn the user that arguments after the first one are ignored.)
>
> 5. The variable wd is meant to be "global" to the script.  In other
>    languages I've programmed in I've seen some typographic convention
>    used for the name of such variables (e.g. all caps) to signal
>    this widened scope.  Does python have such a convention?
>
> Any comments/suggestions on these questions, or anything else about
> the script, would be much appreciated.
>
> TIA!
>
> kynn
>
>
> ----------------------------------------------------------------
> from optparse import OptionParser
> import re
> import datetime
> import sys
>
> class BadArgument(Exception): pass
>
> wd = ("M", "T", "W", "H", "F", "S", "U")
>
> def wkday_abbrev(str):
>   try:
>     mm = re.match("(\d{2})(\d{2})(\d{2})\Z", str)
>
>     y, m, d = map(lambda x: int(mm.group(x)), (1,2,3))
>
>     if y < 38: y = y + 1900
>     else: y = y + 2000
>
>     return wd[datetime.datetime(y, m, d).weekday()]
>   except (AttributeError, ValueError):
>     raise BadArgument()
>
>
> def main():
>
>   usage = '''Usage: %prog [options] YYMMDD
>        %prog -h|--help
> '''
>
>   parser = OptionParser(usage=usage)
>   parser.add_option("-n", "--no-newline", dest="nonl",
>                     action="store_true", help="omit newline in output")
>
>   (options, args) = parser.parse_args();
>
>   try:
>     sys.stdout.write("%s%s" % (args[0], wkday_abbrev(args[0])))
>     if not options.nonl: print
>
>   except (IndexError, BadArgument):
>     print usage
>     sys.exit(1)
>   except: raise
>
> if __name__ == "__main__": main()
>
>   

Other replies cover most of your questions nicely.  But for the testing 
question:

Rename this script to some other name, and call it a module
Write a new script with just three lines in it:

import  othermodule

if __name__ == "__main__":
   othermodule.main()



Now your testing code can go in "othermodule.py"

Note that I would put the argument parsing logic in the new file, so 
parts of main() would actually move.  Normally I'd call main() with two 
arguments - options, args

Your use of optparse could be more streamlined.  For example, it'll 
build the help string for you, based on the various calls to 
add_option(), and it includes its own -h and --help implicitly.




From namekuseijin.nospam at gmail.com  Sun May 10 15:40:50 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Sun, 10 May 2009 16:40:50 -0300
Subject: I'm intrigued that Python has some functional constructions in
	the language.
In-Reply-To: <24381226-a7a0-4fbb-b928-644609e5909b@w31g2000prd.googlegroups.com>
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
	<gu4fgi$1222$1@adenine.netfront.net>
	<24381226-a7a0-4fbb-b928-644609e5909b@w31g2000prd.googlegroups.com>
Message-ID: <gu79ud$2al5$1@adenine.netfront.net>

Carl Banks wrote:
> On May 9, 10:57 am, namekuseijin <namekuseijin.nos... at gmail.com>
> wrote:
>> Carl Banks wrote:
>>> On May 8, 7:19 pm, namekuseijin <namekusei... at gmail.com> wrote:
>>>> On May 8, 10:13 pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>>>> In Haskell, Lisp and other functional programming languages, any extra
>>>> syntax gets converted into the core lambda constructs.
>>> So?  The user still uses that syntax, so how can you claim it doesn't
>>> matter?
>>>>  In Lisp
>>>> languages, that syntax is merely user-defined macros, but in Haskell
>>>> it's builtin the compiler for convenience.
>>> I don't even know what you're saying here
>> I'm saying syntax is nothing special.  They are user-defined, as
>> functions.  And it all gets converted into functions.  Functions matter,
>> syntax is irrelevant because you can do away with it.
> 
> Nope, sorry, you're ignoring half the problem here.  Syntax is only
> irrelevant if you actually do do away with it.  As long as syntax is
> there and people use it, then it matters, regardless of whether it all
> reduces to function calls.

It's handy, yes.  It's just nothing special, specially when composing 
programs out of function composition.

> For a very benign example, consider the ways that Python and Haskell
> write listcomps:
> 
> [ x for x in ss ]
> [ x | x <- ss ]
> 
> One of these might be more readable than the other (I make no
> implication which);

Haskell uses math notation, which may not be to everyone's tastes as far 
as IT has largely left its compsci and math roots and every Joe Sixpack 
might assembly an usable app with a scripting language, some 
template-writing IDE and a few frameworks.

> however, readability has nothing to do with
> whether the compiler internally reduces it to a function call or not.
> Readibility counts, therefore syntax matters.

Function calls are perfectly readable.

> Now, maybe readability concerns don't matter to you personally, but it
> does matter to the OP, who is trying to advocate functional
> programming but is having difficulty because most purely functional
> languages have hideous minimalist syntax that turns people off.

BTW, rereading it again, the OP was originally questioning about 
compiler optimizations for purely functional constructs within Python, 
but somehow syntax got in the middle.

I don't see how "syntax would be a lot easier to understand" if it would 
"be possible to more clearly separate the pure code (without side 
effects) from the impure code (that deals with state changes, I/O, 
etc.), so that the pure code could be compiled and have aggressive 
functional transformations applied to it for efficiency."

Syntax would remain the same, I guess.

>> In functional programming languages, predefined syntax is mostly
>> irrelevant.  In Python and other imperative languages, it's absolutely
>> necessary.  That's my point.
> 
> I think you are overstating this by a lot.

Perhaps.


From __peter__ at web.de  Sun May 10 16:05:49 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 10 May 2009 22:05:49 +0200
Subject: import overwrites __name__
References: <gu1pad$afi$1@ger.gmane.org>
	<mailman.5361.1241924171.11746.python-list@python.org>
	<gu600c$pvt$00$1@news.t-online.com> <m2skjddmdh.fsf@cs.uu.nl>
	<gu74ld$cii$02$1@news.t-online.com> <m2ocu0eqp4.fsf@cs.uu.nl>
Message-ID: <gu7c2j$efo$03$1@news.t-online.com>

Piet van Oostrum wrote:

>>>>>> Peter Otten <__peter__ at web.de> (PO) wrote:
> 
>>PO> Piet van Oostrum wrote:
>>>> 
>>>> This is perfectly normal.
> 
>>PO> I'm not 100% sure of that.
> 
> Why not?

What you quoted was not code I would /normally/ write. I was playing with 
the context and meaning of your sentence.

Sorry, this is just a joke that went awry.

Peter



From socyl at 987jk.com.invalid  Sun May 10 16:43:21 2009
From: socyl at 987jk.com.invalid (kj)
Date: Sun, 10 May 2009 20:43:21 +0000 (UTC)
Subject: Q's on my first python script
References: <gu6im5$1hi$1@reader1.panix.com>
	<0216ec41$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <gu7e99$140$1@reader1.panix.com>

In <0216ec41$0$20647$c3e8da3 at news.astraweb.com> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

>On Sun, 10 May 2009 12:52:21 +0000, kj wrote:

>> 1. The name of the BadArgument exception class defined in the script
>>    does not seem to me sufficiently specific.  If one were to import the
>>    script in order to reuse its wkday_abbrev function, I'd like this
>>    exception's name to be more unequivocally tied to this script.  What
>>    I'm looking for is something like a "namespace" for this script. 
>>    What's the pythonic way to construct a namespace?

>You already have one. The module you have created is a namespace. If your 
>script is called "myscript.py", then to use it elsewhere you would do:

>import myscript
>raise myscript.BadArgument


>> 2. In some python modules I've seen the idiom
>> 
>>    if __name__ == "__main__":
>>       # run some tests here
>> 
>>    I'd like to set up tests for this script, mostly to ensure that it
>>    handles the error cases properly, but I'm alread using the idiom
>>    above to actually run the script under normal operation. What's the
>>    typical python idiom for running tests on a *script* (as opposed to a
>>    module that is normally not supposed to be run directly)?

>I sometimes give my scripts an option -t or --self-test, and then run 
>tests if that option is passed on the command line.

>Alternatively, put your tests in another module, say, myscript_tests.py, 
>and then just run that when you want to test myscript.

> 
>> 3. Still on the subject of testing, how does one capture in a
>>    variable the output that would normally have gone to stdout or
>>    stderr?

>Normally you would write the function to *return* the result, rather than 
>*print* the result. If all output goes through the function return 
>mechanism, then it's easy to capture: x = func().

>However, for cases where the function does print directly, you can 
>redefine stdout and strerr to be any file-like object, so you can do 
>something like this:


># untested
>import sys
>import cStringIO
>save_stdout, save_stderr = sys.stdout, sys.stderr
>c1 = cStringIO.StringIO()
>c2 = cStringIO.StringIO()
>try:
>    sys.stdout = c1
>    sys.stderr = c2
>    result = func(*args, **kwargs)  # normally prints some stuff
>finally:
>    # restore standard files
>    sys.stdout = save_stdout
>    sys.stderr = save_stderr
>captured_from_stdout = c1.getvalue()
>captured_from_stderr = c2.getvalue()


> 
>> 4. What's the python way to emit warnings?  (The script below should
>>    warn the user that arguments after the first one are ignored.)

>import warnings
>warnings.warn("The end of the world is coming!")


>> 5. The variable wd is meant to be "global" to the script.  In other
>>    languages I've programmed in I've seen some typographic convention
>>    used for the name of such variables (e.g. all caps) to signal this
>>    widened scope.  Does python have such a convention?

>As a general rule, it's best to avoid globals variables as much as 
>possible.

>One convention I occasionally use is to prefix global variables with a 
>lowercase g. And then ruthlessly refactor my code until any variable 
>starting with a lowercase g is removed :)


Thanks!  That was very helpful!

Kynn
-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From socyl at 987jk.com.invalid  Sun May 10 16:52:04 2009
From: socyl at 987jk.com.invalid (kj)
Date: Sun, 10 May 2009 20:52:04 +0000 (UTC)
Subject: Q's on my first python script
References: <gu6im5$1hi$1@reader1.panix.com>
Message-ID: <gu7epk$mt6$1@reader1.panix.com>



Thank you all very much!  I really appreciate it.

kynn
-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From socyl at 987jk.com.invalid  Sun May 10 17:00:23 2009
From: socyl at 987jk.com.invalid (kj)
Date: Sun, 10 May 2009 21:00:23 +0000 (UTC)
Subject: What's the use of the else in try/except/else?
Message-ID: <gu7f97$mt6$2@reader1.panix.com>



I know about the construct:

try:
    # do something 
except ...:
    # handle exception
else:
    # do something else

...but I can't come with an example in which the same couldn't be
accomplished with

try:
    # do something
    # do something else
except ...:
    # handle exception

The only significant difference I can come up with is that in the
second form, the except clause may be masking some unexpected
exceptions from the "do something else" part.  Is this the rationale
behind this else clause?  Or is there something more to it?

TIA!

kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From Shawn at Milochik.com  Sun May 10 17:52:42 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Sun, 10 May 2009 17:52:42 -0400
Subject: Downloading most recently modified files
In-Reply-To: <23471969.post@talk.nabble.com>
References: <23432457.post@talk.nabble.com>
	<2dc0c81b0905071336l365f6b3aq51761873b52e38d0@mail.gmail.com>
	<23471969.post@talk.nabble.com>
Message-ID: <2dc0c81b0905101452h4e5cad78g6d4f677fa116206a@mail.gmail.com>

On Sun, May 10, 2009 at 1:04 PM, AllenLars <allenreas at gmail.com> wrote:
>
> Thanks Shawn.  I went through the ftplib info and I was able to generate a
> list.  I am needing to figure out parsing the list.
>
> AllenLars


Well, start by separating out the date and the file name. You'll want
the date for sorting, and the file name for when you decide to
download it. If you want help with regular expressions, let me know.
If so, post a sample of the code you have so far for parsing, sample
input (the raw listing), and sample output showing exactly how you
want it to look. As long as you write some code (even if it's not
working the way you want), I don't mind helping you fix it up.


From pavlovevidence at gmail.com  Sun May 10 18:18:37 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sun, 10 May 2009 15:18:37 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com> 
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com> 
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com> 
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com> 
	<gu4fgi$1222$1@adenine.netfront.net>
	<24381226-a7a0-4fbb-b928-644609e5909b@w31g2000prd.googlegroups.com>
	<gu79ud$2al5$1@adenine.netfront.net>
Message-ID: <2abd8518-fbb1-4a84-b84d-4e1e4a74aa3b@s1g2000prd.googlegroups.com>

On May 10, 12:40?pm, namekuseijin <namekuseijin.nos... at gmail.com>
wrote:
> Carl Banks wrote:
> > Now, maybe readability concerns don't matter to you personally, but it
> > does matter to the OP, who is trying to advocate functional
> > programming but is having difficulty because most purely functional
> > languages have hideous minimalist syntax that turns people off.
>
> BTW, rereading it again, the OP was originally questioning about
> compiler optimizations for purely functional constructs within Python,
> but somehow syntax got in the middle.

Syntax--the thing you claim doesn't matter--got in the middle because
it was the main factor that drove the OP to look for alternatives to
Haskell.

That's what makes your entire argument ridiculous; you are making this
theoretical argument like, "everything reduces to a function so it
doesn't matter what syntax you use," yet people in the real world are
out there trying to find alternatives because functional languages'
syntax sucks so bad in general.


> I don't see how "syntax would be a lot easier to understand" if it would
> "be possible to more clearly separate the pure code (without side
> effects) from the impure code (that deals with state changes, I/O,
> etc.), so that the pure code could be compiled and have aggressive
> functional transformations applied to it for efficiency."
>
> Syntax would remain the same, I guess.

You totally missed the point.

The thing that would make the syntax a lot easier to understand is
that it's in Python and not Haskell.

The reason the OP was asking about separating pure code from impure
was to see if some subset of Python could be used as a pure functional
language, that way they could employ Python and its already-much-
better-than-Haskell's syntax as a pedagogical replacement for Haskell.

I am sure there are many people who think that even "f a b" is cryptic
compared to "f(a,b)", but if that's the only issue it wouldn't be that
big of a deal.  It's not the only issue.  When a language requires you
to read and write stuff like "map :: (x -> y) -> f x -> f y" or "f s@
(x:xs) = x:s" then it's going to turn a lot of people off.


Carl Banks


From Scott.Daniels at Acm.Org  Sun May 10 18:52:23 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 10 May 2009 15:52:23 -0700
Subject: What's the use of the else in try/except/else?
In-Reply-To: <gu7f97$mt6$2@reader1.panix.com>
References: <gu7f97$mt6$2@reader1.panix.com>
Message-ID: <w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net>

kj wrote:
> ...  I can't come with an example in which the same couldn't be
> accomplished with
> 
> try:
>     # do something
>     # do something else
> except ...:
>     # handle exception
> 
> The only significant difference I can come up with is that in the
> second form, the except clause may be masking some unexpected
> exceptions from the "do something else" part.  Is this the rationale
> behind this else clause?  Or is there something more to it?

Yes, in a way.  The idea of catching particular exceptions is to only
handle exceptions you expect (let the others go out to more general
reporters).  So, not only should you choose the tightest exception to
catch that you can, but you should look for it in a very narrow window:
exactly where you expect it.

     try:
         v = mumble.field
     except AttributeError:
         pass
     else:
         sys.warning('field was actually there?')

as opposed to:

     try:
         v = mumble.field
         sys.warning('field was actually there?')
     except AttributeError:
         pass

The idea is to make it clear what you expect might go
wrong that you are prepared to handle.

--Scott David Daniels
Scott.Daniels at Acm.Org


From toby at tobiah.org  Sun May 10 19:06:34 2009
From: toby at tobiah.org (Tobiah)
Date: Sun, 10 May 2009 23:06:34 GMT
Subject: There may be a much better way to manage artillery.
Message-ID: <_5JNl.4895$qP.3696@newsfe03.iad>

I'm writing a video game with armed space ships.
I decided to make a class to manage all of the bullets
that may be on the screen at a given time:

class Bullets():

        def __init__(self):
                self.bullets = []

        def update(self):
                temp = []
                for bullet in self.bullets:
                        bullet.update()
                        bullet.time_to_live -= 1
                        if bullet.time_to_live:
                                temp.append(bullet)
                self.bullets = temp

        def add(self, new_bullet):
                self.bullets.append(new_bullet)

When the main loop calls .update() on the bullets
object, I want it to decrement a counter on each
bullet, and destroy the bullets who's time has come.

I wanted the bullets to be responsible for destroying
themselves, but a little Googling brought me to points
about dangling references and how an object is not allowed
(nor does it seem to have the means) to destroy itself. 
That's why I made this wrapper class for all of the bullets.

The idea is to copy bullets with time left into a temp list
and then overwrite the man bullets array with the good bullets.
I believe that the other bullets will be garbage collected.
I could not delete the items in place within the loop, of course.
Was there a better container than a list for my purposes?

Above is what I settled on, but I wonder
whether my approach is a good one.

Thanks very much,

Toby


From rhodri at wildebst.demon.co.uk  Sun May 10 19:10:14 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 11 May 2009 00:10:14 +0100
Subject: ISO exemplary Python scripts
In-Reply-To: <gu49s1$g84$1@reader1.panix.com>
References: <gu2j3n$a90$1@reader1.panix.com>
	<802a051qoqmpnih0j2su9hhriqumagu326@4ax.com>
	<gu49s1$g84$1@reader1.panix.com>
Message-ID: <op.utqlbcpoa8ncjz@gnudebst>

On Sat, 09 May 2009 17:09:38 +0100, kj <socyl at 987jk.com.invalid> wrote:

> I know that in the python world the distinction between a script
> and a (library) module is not so clear-cut, and it is common for
> library modules to have "top-level" stuff (typically test code)
> that gets run if the module is invoked directly from the command
> line.  But this is not *really* a script as I understand it, because,
> even though it "runs" directly from the command-line, it lacks the
> typical CLI amenities, such as command-line flags, help messages,
> diagnostic messages that are aimed to the "naive user" (i.e. as
> opposed to the developer), etc.  The coding of these "CLI amenities"
> is one of aspects of these "exemplary Python scripts" I'm most
> interested in learning about.

While I don't entirely agree with your definition of a script,
for a lot of those CLI amenities "optparse" is your friend.
Possibly also your enemy if you don't want to do things its way,
but it does at least make parameter handling in a user-friendly way
easy.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From Graham.Dumpleton at gmail.com  Sun May 10 19:11:09 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Sun, 10 May 2009 16:11:09 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<12ef7b00-f0c5-4030-a353-533d93d23cdd@r3g2000vbp.googlegroups.com>
Message-ID: <794f117f-4df5-4c6c-be68-f901959b2579@y10g2000prc.googlegroups.com>

On May 10, 3:40?am, Paul Boddie <p... at boddie.org.uk> wrote:
> On 9 Mai, 01:36, dpapathanasiou <denis.papathanas... at gmail.com> wrote:
>
>
>
> > Apache's configure utility (I'm using httpd version 2.2.11) doesn't
> > explicitly describe an expat library option.
>
> > Also, if libexpat is version 1.95.2, wouldn't I have to get version
> > 2.0 to be compatible with pyexpat?
>
> The aim would be to persuade Apache to configure itself against the
> same Expat library that pyexpat is using, which would involve the
> headers and libraries referenced during the pyexpat configuration
> process, although I seem to recall something about pyexpat bundling
> its own version of Expat - that would complicate matters somewhat.
>
> > If anyone has any advice or suggestions, I'd appreciate hearing them.
>
> Expat might be getting brought into Apache via mod_dav:
>
> http://www.webdav.org/mod_dav/install.html
>
> Perhaps disabling mod_dav when configuring Apache might drop Expat
> from Apache's library dependencies.

The OP was using Python 2.5, so shouldn't be an issue because pyexpat
properly name space prefixes its version of expat. See:

  http://code.google.com/p/modwsgi/wiki/IssuesWithExpatLibrary

where explicitly says that only applies to Python prior to Python 2.5.

His problem is therefore likely to be something completely different.

Graham


From rhodri at wildebst.demon.co.uk  Sun May 10 19:48:25 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 11 May 2009 00:48:25 +0100
Subject: There may be a much better way to manage artillery.
In-Reply-To: <_5JNl.4895$qP.3696@newsfe03.iad>
References: <_5JNl.4895$qP.3696@newsfe03.iad>
Message-ID: <op.utqm2zd8a8ncjz@gnudebst>

On Mon, 11 May 2009 00:06:34 +0100, Tobiah <toby at tobiah.org> wrote:

[Snippety snip]

> I wanted the bullets to be responsible for destroying
> themselves, but a little Googling brought me to points
> about dangling references and how an object is not allowed
> (nor does it seem to have the means) to destroy itself.
> That's why I made this wrapper class for all of the bullets.

An object can, however, erase its representation from the
screen and tell whatever control system is keeping track
of objects to forget about it.  Once the last reference to
the object is deleted, the object will be garbage collected.

What framework are you writing your game in?  Pygame has
facilities for handling this sort of thing fairly
straightforwardly.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Sun May 10 20:12:04 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 11 May 2009 01:12:04 +0100
Subject: Wrapping comments
In-Reply-To: <towb-63CE3D.09322210052009@news.individual.de>
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
Message-ID: <op.utqn6eu0a8ncjz@gnudebst>

On Sun, 10 May 2009 08:32:23 +0100, Tobias Weber <towb at gmx.net> wrote:

> In article <m2bpq2ngup.fsf at googlemail.com>,
>  Arnaud Delobelle <arnodel at googlemail.com> wrote:
>
>> A simple Alt-Q will reformat everything nicely.
>
> Now that's something. Thanks!
>
> (still not gonna use software that doesn't let me type # because it's
> alt+3 on a UK layout; having to re-learn or configure that is just sick)

What on earth are you talking about?  '#' has its own key on a UK layout
(shared with '~', but you know what I mean), just to the left of the
RETURN key.  Emacs is my editor of choice, and I've never once come
across anything like this.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From martin.hellwig at dcuktec.org  Sun May 10 20:12:26 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Mon, 11 May 2009 01:12:26 +0100
Subject: SimpleXMLRPCServer and creating a new object on for each new
	client request.
In-Reply-To: <m2ws8qf1fw.fsf@cs.uu.nl>
References: <mailman.5173.1241647285.11746.python-list@python.org>
	<m2ab5ojyff.fsf@cs.uu.nl>
	<09a3e655-06ad-46cb-9955-303948f2b271@e24g2000vbe.googlegroups.com>
	<m2ws8qf1fw.fsf@cs.uu.nl>
Message-ID: <5LSdnUoJjZr28JrXnZ2dnUVZ8o2dnZ2d@bt.com>

Piet van Oostrum wrote:
>>>>>> google at smetj.net (g) wrote:
> 
>> g> Well, I think Martin's example will suit my needs.
> 
>> g> Thanks for the explanation!
> 
> His client code is unnecessarily complicated with 3 session variables.
> The following code does the same:
> 
>     SESSION = xmlrpclib.ServerProxy(URL_PORT)
>     print(SESSION.show_random())
>     print(SESSION.show_random())
>     SESSION.shutdown_service()
> 
I was actually aware of that, but I thought it would be more educational 
if I rewrote Jelle's example by using code conformity and a way to test 
server and client in a single script instead of just rewriting it to the 
given intent. With the knowledge provided, Jelle should be able to 
redesign his program to what he actually wants to do with it and cutting 
out the croft himself.

P.S. Piet ben je toevallig lid van NLUUG?

-- 
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'


From showell30 at yahoo.com  Sun May 10 20:17:23 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 10 May 2009 17:17:23 -0700 (PDT)
Subject: help with recursive whitespace filter in
References: <mailman.5380.1241971815.11746.python-list@python.org> 
	<53fc8859-5254-4f49-94f3-c6c430d77371@z5g2000vba.googlegroups.com> 
	<0291fad2-a744-4ced-bcd4-fb8529e968b8@x29g2000prf.googlegroups.com>
Message-ID: <3c107c60-09a1-49b7-9b1d-32d32dce4f7d@x6g2000vbg.googlegroups.com>

On May 10, 10:23?am, rustom <rustompm... at gmail.com> wrote:
> On May 10, 9:49?pm, Steve Howell <showel... at yahoo.com> wrote:
>
>
>
> > On May 10, 9:10?am, Rustom Mody <rustompm... at gmail.com> wrote:
>
> > > I am trying to write a recursive filter to remove whitespace-only
> > > nodes for minidom.
> > > The code is below.
>
> > > Strangely it deletes some whitespace nodes and leaves some.
> > > If I keep calling it -- like so: fws(fws(fws(doc))) ?then at some
> > > stage all the ws nodes disappear
>
> > > Does anybody have a clue?
>
> > > from xml.dom.minidom import parse
>
> > > #The input to fws is the output of parse("something.xml")
>
> > > def fws(ele):
> > > ? ? """ filter white space (recursive)"""
>
> > > ? ?for c in ele.childNodes:
> > > ? ? ? ? if isWsNode(c):
> > > ? ? ? ? ? ? ele.removeChild(c)
> > > ? ? ? ? ? ? #c.unlink() Makes no diff whether this is there or not
> > > ? ? ? ? elif c.nodeType == ele.ELEMENT_NODE:
> > > ? ? ? ? ? ? fws(c)
>
> > > def isWsNode(ele):
> > > ? ? return (ele.nodeType == ele.TEXT_NODE and not ele.data.strip())
>
> > I would avoid doing things like delete/remove in a loop. ?Instead
> > build a list of things to delete.
>
> Yeah I know. I would write the whole damn thing functionally if I knew
> how. ?But cant figure out the API.
> I actually started out to write a (haskell-style) copy out the whole
> tree minus the unwanted nodes but could not figure it out

You can use list comprehensions for a more functional style.

Instead of deleting the unwanted nodes in place, try to create new
lists of just the wanted results.


From apt.shansen at gmail.com  Sun May 10 20:21:56 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 10 May 2009 17:21:56 -0700
Subject: Pythonic way to normalize vertical whitespace
In-Reply-To: <1241798017.7066.1314483739@webmail.messagingengine.com>
References: <1241798017.7066.1314483739@webmail.messagingengine.com>
Message-ID: <7a9c25c20905101721g4953dd53i826e9774c8c68092@mail.gmail.com>

On Fri, May 8, 2009 at 8:53 AM, <python at bdurham.com> wrote:

>  I'm looking for suggestions on technique (not necessarily code) about the
> most pythonic way to normalize vertical whitespace in blocks of text so that
> there is never more than 1 blank line between paragraphs. Our source text
> has newlines normalized to single newlines (\n vs. combinations of \r and
> \n), but there may be leading and trailing whitespace around each newline.
>

I'm not sure what's more Pythonic in this case, but the approach I'd use is
a generator. Like so:

--- code to follow --

def cleaner(body):
    empty = False
    for line in body.splitlines():
        line = line.rstrip()
        if line:
            empty = False
            yield line
        else:
            if empty:
                continue
            else:
                empty = True
                yield ''

Text = """
This is my first paragraph.

This is my second.


This is my third.
This is my fourth.

This is my fifth.



This is my sixth.





This is my seventh.

Okay?
"""

print '\n'.join(cleaner(Text))

--- end code ---

You maybe want to tweak the logic a bit depending on how you want to handle
initial blank lines or such, and I'm two paragraphs w/o a blank line between
them (you talk some of going from \n\n\n to \n\n, so I'm not sure if you
want to allow blank lines separating the paragraphs or require it).

I guess this basically is your first approach, just specifically going with
"Use a generator to do it" instead of regular list building cuz that should
be faster and cleaner int his case.... and I don't think the third approach
is really all that needed. Python can do this pretty quickly.

The second approach seems distinctly unPythonic. I use regular expressions
in several places, mind, but if there's a straight-forward clean way to do
anything without them that always seems like the Pythonic thing to me. :)

But that's just me :)

--S
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From gagsl-py2 at yahoo.com.ar  Sun May 10 20:44:59 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 10 May 2009 21:44:59 -0300
Subject: How can I dynamically insert a base class in a given class
References: <iqshd6-qkf.ln1@archaeopteryx.softver.org.mk>
Message-ID: <op.utqpo9rcx6zn5v@gabriel.sleipnir-bsas>

En Sun, 10 May 2009 00:04:17 -0300, ?????? ??????????? <gdamjan at gmail.com>  
escribi?:

> How can I dynamically insert a base class in a given class? Yeah, I'm
> writing a class decorator that needs to manipulate the class by
> inserting another base class in it.

In this case, as you want to modify the base classes, I think a metaclass  
is more apropiate (the decorator acts too late, *after* the class has  
already been created).
Based on your code:

class ReallyBase(object):
    def someimportantmethod(self):
      return 'really really'

def dynamically_determine_metaclass(args):

     class MyMetaclass(type):
        def __new__(meta, name, bases, namespace):
          bases = (ReallyBase,) + bases
          namespace['some_value'] = args
          return type.__new__(meta, name, bases, namespace)

     return MyMetaclass

class Unsuspecting(object):
    __metaclass__ = dynamically_determine_metaclass(123)
    def stuff(self):
      return "ok"

u = Unsuspecting()
print u.stuff(), u.someimportantmethod(), u.some_value,  
Unsuspecting.some_value

-- 
Gabriel Genellina



From draeath.spamtrap at gmail.com  Sun May 10 22:25:56 2009
From: draeath.spamtrap at gmail.com (draeath)
Date: Sun, 10 May 2009 22:25:56 -0400
Subject: There may be a much better way to manage artillery.
References: <_5JNl.4895$qP.3696@newsfe03.iad>
Message-ID: <_rKdnU2errA3EZrXnZ2dnUVZ_gFi4p2d@giganews.com>

Tobiah wrote:

> I'm writing a video game with armed space ships.
> I decided to make a class to manage all of the bullets
> that may be on the screen at a given time:
> 
> class Bullets():
> 
>         def __init__(self):
>                 self.bullets = []
> 
>         def update(self):
>                 temp = []
>                 for bullet in self.bullets:
>                         bullet.update()
>                         bullet.time_to_live -= 1
>                         if bullet.time_to_live:
>                                 temp.append(bullet)
>                 self.bullets = temp
> 
>         def add(self, new_bullet):
>                 self.bullets.append(new_bullet)
> 
> When the main loop calls .update() on the bullets
> object, I want it to decrement a counter on each
> bullet, and destroy the bullets who's time has come.
> 
> I wanted the bullets to be responsible for destroying
> themselves, but a little Googling brought me to points
> about dangling references and how an object is not allowed
> (nor does it seem to have the means) to destroy itself.
> That's why I made this wrapper class for all of the bullets.
> 
> The idea is to copy bullets with time left into a temp list
> and then overwrite the man bullets array with the good bullets.
> I believe that the other bullets will be garbage collected.
> I could not delete the items in place within the loop, of course.
> Was there a better container than a list for my purposes?
> 
> Above is what I settled on, but I wonder
> whether my approach is a good one.
> 
> Thanks very much,
> 
> Toby

This also gives you the means to destroy the oldest bullet when creating a 
new one, once some arbitrary limit was reached. Think back to how old games 
like Raptor worked.

If you had the bullets take care of their lifetime themselves, you would 
have to have more code touching all the bullets to do this. Now, you can add 
a little bit while you are already working through them all, saving yourself 
some cycles I would wager.




From http  Sun May 10 22:33:04 2009
From: http (Paul Rubin)
Date: 10 May 2009 19:33:04 -0700
Subject: I'm intrigued that Python has some functional constructions in
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com>
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com>
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com>
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com>
	<gu4fgi$1222$1@adenine.netfront.net>
	<24381226-a7a0-4fbb-b928-644609e5909b@w31g2000prd.googlegroups.com>
	<gu79ud$2al5$1@adenine.netfront.net>
	<2abd8518-fbb1-4a84-b84d-4e1e4a74aa3b@s1g2000prd.googlegroups.com>
Message-ID: <7xws8oid27.fsf@ruckus.brouhaha.com>

Carl Banks <pavlovevidence at gmail.com> writes:

> Syntax--the thing you claim doesn't matter--got in the middle because
> it was the main factor that drove the OP to look for alternatives to
> Haskell.

I don't think so.  The OP said that "... the syntax would be a lot
easier to understand, than most functional languages, like Haskell".
He didn't say that Haskell syntax caused him to look for alternatives
and didn't say that Haskell wouldn't still be difficult even if its
syntax were simpler.  Hint: Liskell (Haskell with S-expression syntax)
is still difficult.

> yet people in the real world are out there trying to find
> alternatives because functional languages' syntax sucks so bad in general.

Again, I don't think so.  Functional languages' syntax turns some
people off before they even look at other aspects closely, just like
Python's indentation-based syntax turns some people off.  But, once
you get past the syntax, functional languages STILL present a lot of
obstacles that lots of users never get past.

> The reason the OP was asking about separating pure code from impure
> was to see if some subset of Python could be used as a pure functional
> language, that way they could employ Python and its already-much-
> better-than-Haskell's syntax as a pedagogical replacement for Haskell.

That wouldn't make sense at all.  60% of what makes Haskell different
(and harder) than Python is probably the complicated (but powerful)
static type system; 35% is the nonstrict evaluation strategy, and 5%
the syntax.  If you somehow added a method in Python to separate pure
from impure code, but it was still a dynamic language with strict
evaluation, you'd only be 5% of the way to replacing Haskell.


From prakash.stack at gmail.com  Sun May 10 23:06:20 2009
From: prakash.stack at gmail.com (prakash jp)
Date: Mon, 11 May 2009 08:36:20 +0530
Subject: stand alone exec
Message-ID: <805f59d50905102006obd4e42bo6b8923b62f84f6d6@mail.gmail.com>

Hi all,

I want to run dos commands through python stand alone execs. The created
Python stand alone executable (py2exe)  works fine

in my machine but on transferring the "dist" folder to other systems the
executable fails to run.

I tried to copy the MSVCP90.dll in the "dist" folder. Also tried to exclude
the same dll in the options of the setup.py file

The error reads as follows :

"The application has failed to start because the application configuration
is incorrect. Reinstalling the application may fix this problem".

Details of the installed setup files may be useful :

1- python-2.6.1.msi
2- py2exe-0.6.9.win32-py2.6.exe
3- pywin32-212.win32-py2.6.exe

Thanks in advance

Regards
Prakash
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From viniciusban at gmail.com  Sun May 10 23:30:16 2009
From: viniciusban at gmail.com (Vinicius Assef)
Date: Mon, 11 May 2009 00:30:16 -0300
Subject: Web Based Front End?
In-Reply-To: <18804639-32ae-4bdf-9ecc-4c8b21f8a43f@g19g2000vbi.googlegroups.com>
References: <18804639-32ae-4bdf-9ecc-4c8b21f8a43f@g19g2000vbi.googlegroups.com>
Message-ID: <f94f764e0905102030y15e5c19bq6e4ca8c21fccf77a@mail.gmail.com>

On Thu, May 7, 2009 at 10:52 PM,  <baseelinger at yahoo.com> wrote:
[snip]
>
> So, my question is what is the best method to be able to have a user
> enter specific data on a web page, have that data be passed to the
> Python script and then have the output returned to the web page?

Django is the buzzword, among python community here, in Brazil.

In fact it is really powerful. Give it a try. ;-)

--
[ ]s
Vinicius Assef.
http://aprenda-python.blogspot.com


From kalman_g at msn.com  Sun May 10 23:57:05 2009
From: kalman_g at msn.com (GKalman)
Date: Sun, 10 May 2009 20:57:05 -0700 (PDT)
Subject: Importing from a module which contains more than one Class...
Message-ID: <23476815.post@talk.nabble.com>


OS= MS Vista
File structure:
.../Module  (i.e a Folder with 2 sub-folders)
    .../Module_Class    (sub-folder #1)
               /MyClass.py
    .../Module_Class_Testing  (sub_folder #2)
             /module_class_driver.py

Here is the code for the two (simplified) Python files:


#this is module_class_driver.py
#======================
import sys

dir1='C:\\Programming\\Python\\Prototypes\\Core_Python_Prototypes\\Module\\Module_Class'
sys.path.append(dir1)


from MyClass import *
from MyOtherClass import *     # error msg: no such module!

c=MyClass(2.5)
print c.double_it()

cc=MyOtherClass(5.0)          #error
print cc.triple_it()               #error


#this is MyClass.py
#============
class MyClass:
    def __init__(self,x):
        self.x=x
    def double_it(self):
        return 2*self.x

class MyOtherClass:
    def __init__(self,y):
        self.y=y
    def triple_it(self):
        return 3*self.y

Question:
*******
As I mentioned above,  the code for MyClass & MyOtherClass is in the same
file . This program only works with a single Class in a file. That is when
the File name is the SAME as the Class name.

How to import from a File which contains more than one (unrelated) Classes?



-- 
View this message in context: http://www.nabble.com/Importing-from-a-module-which-contains-more-than-one-Class...-tp23476815p23476815.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From wuwei23 at gmail.com  Mon May 11 00:19:52 2009
From: wuwei23 at gmail.com (alex23)
Date: Sun, 10 May 2009 21:19:52 -0700 (PDT)
Subject: Importing from a module which contains more than one Class...
References: <mailman.5405.1242014228.11746.python-list@python.org>
Message-ID: <c2279eb3-1204-4830-8459-61d2b00b669b@f1g2000prb.googlegroups.com>

GKalman <kalma... at msn.com> wrote:
> from MyClass import *
> from MyOtherClass import * ? ? # error msg: no such module!
>
> As I mentioned above, ?the code for MyClass & MyOtherClass is in the same
> file . This program only works with a single Class in a file. That is when
> the File name is the SAME as the Class name.
>
> How to import from a File which contains more than one (unrelated) Classes?

You seem to have misunderstood how 'import' works, I strongly
recommend re-reading the tutorial section:
http://docs.python.org/tutorial/modules.html

Basically, the import statement has two forms:

   1. from <module> import <contents>
   2. import <module>

So your example of 'from <classname> import *' just doesn't make a lot
of sense within Python.

If MyClass.py contains two classes, MyClass and MyOtherClass, you
should be able to import them with:

   from MyClass import MyClass, MyOtherClass

However, you _should_ be already getting _everything_ MyClass.py
contains as you're using the grab-all asterisk. Could you open a
python shell in your Module_Class folder, type 'from MyClass import
MyClass, MyOtherClass', and past whatever traceback you get here?


From timr at probo.com  Mon May 11 00:34:26 2009
From: timr at probo.com (Tim Roberts)
Date: Sun, 10 May 2009 21:34:26 -0700
Subject: ISO exemplary Python scripts
References: <gu2j3n$a90$1@reader1.panix.com>
	<802a051qoqmpnih0j2su9hhriqumagu326@4ax.com>
	<gu49s1$g84$1@reader1.panix.com>
Message-ID: <6eaf05d1tmhmhrb7tvd1rsojhco22utaq4@4ax.com>

kj <socyl at 987jk.com.invalid> wrote:
>
>Thanks, but the last bit of your post ("...most of which have the
>ability to run by themselves") makes me wonder whether we mean the
>same thing when we talk of "scripts."  Can you give me an example
>of a script that *does not* have the ability to run by itself?
>When I use the word "script" I mean, *by definition*, a piece of
>code that has the ability to run by itself.
>
>I know that in the python world the distinction between a script
>and a (library) module is not so clear-cut,

Exactly.  This is true for many of the languages that are traditionally
interpreted.  Things start off as standalone applications and morph into
general purpose modules, or vice versa.  As a result, I lazily call any
Python source file a "script".

>But this is not *really* a script as I understand it, because,
>even though it "runs" directly from the command-line, it lacks the
>typical CLI amenities, such as command-line flags, help messages,
>diagnostic messages that are aimed to the "naive user" (i.e. as
>opposed to the developer), etc.  The coding of these "CLI amenities"
>is one of aspects of these "exemplary Python scripts" I'm most
>interested in learning about.

In my vocabulary, I'd probably call this an "application".

I guess my basic point is that the standard library contains good examples
of Python programming, and the "Python way of thinking".  Command-line
argument processing is not a particularly unique task, so the same
techniques that work for parsing things from files, or for handling
arguments in a list, work equally well for handling arguments, especially
with the help of getopt and optparse.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From tjreedy at udel.edu  Mon May 11 01:47:06 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 11 May 2009 01:47:06 -0400
Subject: unicode bit me
In-Reply-To: <05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>	<mailman.5310.1241809502.11746.python-list@python.org>	<m2eiuzi92l.fsf@cs.uu.nl>
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com>
	<mailman.5338.1241882849.11746.python-list@python.org>	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>	<mailman.5346.1241892428.11746.python-list@python.org>	<m263gagjjl.fsf@cs.uu.nl>
	<mailman.5350.1241904119.11746.python-list@python.org>	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>	<slrnh0d0gd.mi5.nick@irishsea.home.craig-wood.com>
	<05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>
Message-ID: <gu8e4o$7uf$1@ger.gmane.org>

anuraguniyal at yahoo.com wrote:

> so unicode(obj) calls __unicode__ on that object

It will look for the existence of type(ob).__unicode__ ...

 > and if it isn't there __repr__ is used

According to the below, type(ob).__str__ is tried first.

> __repr__ of list by default return a str even if __repr__ of element
> is unicode

 From the fine library manual, built-in functions section:
(I reccommend using it, along with interactive experiments.)

"repr( object)
Return a string ..."

"str( [object])
Return a string ..."

"unicode( [object[, encoding [, errors]]])

Return the Unicode string version of object using one of the following 
modes:

If encoding and/or errors are given, ...

If no optional parameters are given, unicode() will mimic the behaviour 
of str() except that it returns Unicode strings instead of 8-bit 
strings. More precisely, if object is a Unicode string or subclass it 
will return that Unicode string without any additional decoding applied.

For objects which provide a __unicode__() method, it will call this 
method without arguments to create a Unicode string. For all other 
objects, the 8-bit string version or representation is requested and 
then converted to a Unicode string using the codec for the default 
encoding in 'strict' mode.
"

'unicode(somelist)' has no optional parameters, so skip to third 
paragraph.  Somelist is not a unicode instance, so skip to the last 
paragraph.  If you do dir(list) I presume you will *not* see 
'__unicode__' listed.  So skip to the last sentence.
unicode(somelist) == str(somelist).decode(default,'strict').

I do not believe str() and repr() are specifically documented for 
builtin classes other than the general description, but you can figure 
that str(collection) or repr(collection) will call str or repr on the 
members of the collection in order to return a str, as the doc says. 
(Details are available by experiment.)  Str(uni_string) encodes with the 
default encoding, which seems to be 'ascii' in 2.x.  I am sure it uses 
'strict' errors.

I would agree that str(some_unicode) could be better documented, like 
unicode(some_str) is.

> so my only solution looks like to use my own list class everywhere i
> use list
> class mylist(list):
>     def __unicode__(self):
>         return u"["+u''.join(map(unicode,self))+u"]"

Or write a function and use that instead, or, if and when you can, 
switch to 3.x where str and repr accept and produce unicode.

tjr



From rogerb at rogerbinns.com  Mon May 11 02:55:52 2009
From: rogerb at rogerbinns.com (Roger Binns)
Date: Sun, 10 May 2009 23:55:52 -0700
Subject: Learning C++ for Python Development
In-Reply-To: <5d97efc2-af41-4dd6-a243-50f85d54746c@s16g2000vbp.googlegroups.com>
References: <5d97efc2-af41-4dd6-a243-50f85d54746c@s16g2000vbp.googlegroups.com>
Message-ID: <gu8i5o$g30$1@ger.gmane.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

joshua.pearce at gmail.com wrote:
> Or, just give me some general advice on learning C++ for Python?

You may want to start with Cython first.  It lets you intersperse C and
C level information with Python code to produce extensions.  That will
give you a gentler introduction to using a C like language with Python
and for many real world uses is actually sufficient to get C levels of
performance and interfacing with Python.

After you get that working then you can try coding your own extensions
(the Python docs include all the necessary information) and also trying
other tools such as SWIG which automate some of the code for wrapping
C++, or the wrapping functionality present in Boost.

I find it most helpful to explore doing the same thing in multiple
different ways as it teaches you what is important and what isn't.
Later on it will help you a lot better in choosing the right tool for
the job (no one tool or approach is perfect) and help evaluate anything
that comes up later.

My suggestion would be to pick a particular task and code it in pure
Python.  Benchmark it (cpu and memory) and then try the other approaches
(Cython, Boost, hand coded, SWIG) and see how they compare.  Something
like a brute force Suduko solver would let you have a few
classes/objects but not be too much code.

Roger
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From ldo at geek-central.gen.new_zealand  Mon May 11 02:58:48 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 11 May 2009 18:58:48 +1200
Subject: OT (humor): 'import antigravity' in action!
References: <mailman.5354.1241924166.11746.python-list@python.org>
Message-ID: <gu8ib8$u1k$3@lust.ihug.co.nz>

In message <mailman.5354.1241924166.11746.python-list at python.org>, Shawn 
Milochik wrote:

> I know you've probably all seen this 50 times, but just in case:
> http://xkcd.com/353/

Ironically, that's no longer valid in Python 3.0.



From clp2 at rebertia.com  Mon May 11 03:10:32 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 11 May 2009 00:10:32 -0700
Subject: OT (humor): 'import antigravity' in action!
In-Reply-To: <gu8ib8$u1k$3@lust.ihug.co.nz>
References: <mailman.5354.1241924166.11746.python-list@python.org>
	<gu8ib8$u1k$3@lust.ihug.co.nz>
Message-ID: <50697b2c0905110010j66a4ac11t9836417c23041a4b@mail.gmail.com>

On Sun, May 10, 2009 at 11:58 PM, Lawrence D'Oliveiro
<ldo at geek-central.gen.new_zealand> wrote:
> In message <mailman.5354.1241924166.11746.python-list at python.org>, Shawn
> Milochik wrote:
>
>> I know you've probably all seen this 50 times, but just in case:
>> http://xkcd.com/353/
>
> Ironically, that's no longer valid in Python 3.0.

But only by a pair of parens! Still beats the pants off Java.

Cheers,
Chris
-- 
http://blog.rebertia.com


From ldo at geek-central.gen.new_zealand  Mon May 11 03:11:00 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 11 May 2009 19:11 +1200
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
References: <mailman.5282.1241783298.11746.python-list@python.org>
Message-ID: <gu8j26$up8$1@lust.ihug.co.nz>

In message <mailman.5282.1241783298.11746.python-list at python.org>, Geoff 
Gardiner wrote:

> How do I assure myself of the integrity of a Python installation
> acquired using apt-get install on Debian and Ubuntu?

    apt-get install debsums
    man debsums




From chris.mahan at gmail.com  Mon May 11 03:23:29 2009
From: chris.mahan at gmail.com (Christopher Mahan)
Date: Mon, 11 May 2009 00:23:29 -0700
Subject: HTTP HEAD and docxmlrpcserver
Message-ID: <4d9b53db0905110023r6d92d0dcx4135603713295a02@mail.gmail.com>

I have a docxmlrpcserver install (kissws.com) that's returning HTTP code 501
when the client makes a HEAD request.

Any idea as to whether that's by design?

Thanks in advance.


Chris Mahan
chris.mahan at gmail.com
gv (818) 671-1709
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From namekuseijin at gmail.com  Mon May 11 03:56:12 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Mon, 11 May 2009 00:56:12 -0700 (PDT)
Subject: I'm intrigued that Python has some functional constructions in 
	the language.
References: <b5090552ks9fjo66rf7bqqqjhce814nij9@4ax.com>
	<44350436-de1a-451e-95f5-13b902a902ce@s21g2000vbb.googlegroups.com>
	<gu269i$16if$1@adenine.netfront.net>
	<cfe802bb-32fe-4362-92f0-60ee5c1a9eca@r13g2000vbr.googlegroups.com>
	<9e68a155-177d-4e03-97b6-c19cbb986515@z19g2000vbz.googlegroups.com> 
	<7fa66f4e-e88c-4fb4-a509-911756814f89@o27g2000vbd.googlegroups.com> 
	<ca42cd0a-7916-4daf-87e4-c61889bfec92@g20g2000vba.googlegroups.com> 
	<e34d027a-4f58-4515-bf09-ba2ec37d51cf@f41g2000pra.googlegroups.com> 
	<gu4fgi$1222$1@adenine.netfront.net>
	<24381226-a7a0-4fbb-b928-644609e5909b@w31g2000prd.googlegroups.com>
	<gu79ud$2al5$1@adenine.netfront.net>
	<2abd8518-fbb1-4a84-b84d-4e1e4a74aa3b@s1g2000prd.googlegroups.com>
Message-ID: <9f3d6fc6-8082-497a-bcc2-2514be39f9e3@x6g2000vbg.googlegroups.com>

On May 10, 7:18?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 10, 12:40?pm, namekuseijin <namekuseijin.nos... at gmail.com>
> wrote:
> theoretical argument like, "everything reduces to a function so it
> doesn't matter what syntax you use," yet people in the real world are
> out there trying to find alternatives because functional languages'
> syntax sucks so bad in general.

It's not that it sucks.  More that it's pretty much non-existent.
Yes, many people are very sensitive to such issue -- that is, that
they feel lost without common constructs permeating the code rather
than the fluid and recursive nature of functional programming and its
never-ending flow of userland function calls.

OTOH, I can't help but think part of it has to do with plain text in
your face rather than lots of colorful keywords in your fav editor.

> The reason the OP was asking about separating pure code from impure
> was to see if some subset of Python could be used as a pure functional
> language, that way they could employ Python and its already-much-
> better-than-Haskell's syntax as a pedagogical replacement for Haskell.

ah, probably.  Python has replaced Scheme in certain pedagogical
circles too.  Scheme was considered a great tool for teaching basic
compsci concepts *precisely* for it's lack of syntax so that students
could concentrate on the concepts and problems at hand rather than
fight against the compiler or have to learn a huge tome of libs and
frameworks before even outputting a single "hello world".

But Java was all the rage in the past few years at introductory
compsci and at least no doubt Python is a blessing compared to that.
Though it too is not without a lot of quirks itself...

> I am sure there are many people who think that even "f a b" is cryptic
> compared to "f(a,b)", but if that's the only issue it wouldn't be that
> big of a deal. ?It's not the only issue. ?When a language requires you
> to read and write stuff like "map :: (x -> y) -> f x -> f y"

This is a type annotation and there's nothing similar in Python given
it's typeless nature.  Should I call Python's non-existent type
annotations horrible too?

>"f s@ (x:xs) = x:s" then it's going to turn a lot of people off.

what about

@foobize
def dingle( n, *boz ): return boz[n:-2]

?  Sounds perfectly cryptic for the non-initiated too.


From nick at craig-wood.com  Mon May 11 04:30:03 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 11 May 2009 03:30:03 -0500
Subject: Learning C++ for Python Development
References: <5d97efc2-af41-4dd6-a243-50f85d54746c@s16g2000vbp.googlegroups.com>
Message-ID: <slrnh0fn8r.qcl.nick@irishsea.home.craig-wood.com>

joshua.pearce at gmail.com <joshua.pearce at gmail.com> wrote:
>  I am a recovering C# web developer who has recently picked up Django
>  and I'm loving it.
> 
>  I would eventually like to get a job as a Django/Python developer. It
>  seems that many Python jobs require that you also be a C++ developer.
>  While I want to remain primarily a web developer, I don't want be
>  stuck doing CRUD applications, so I would like to learn C++ for Python
>  development. I have taken two basic programming courses in straight up
>  C++, no STL, Boost or anything like that, but I do have a very basic
>  knowledge of the language.
> 
>  Can you folks suggest some Python packages which use C++ and are
>  relevant for web development, so I can dig through the source and
>  contribute in some way?
> 
>  Or, just give me some general advice on learning C++ for Python?

I'm guessing that people who advertise for C++ and Python are
embedding python into C++ not extending python with C++.

Having done both things, I can say that embedding python into C++ is
not too much trouble, but that it is slightly easier to extend python
with C rather than C++ since the python executable is a C program not
a C++ program.

I'd start by reading this

  http://docs.python.org/extending/

And try some of the examples.

I'd also read all about ctypes

  http://docs.python.org/library/ctypes.html

Which has saved me a huge amount of time in both the embedding and
extending cases!  One of the apps I've worked on is C++ but can have
"drivers" written in python run by an embedded python interpreter.
These drivers can call back into the C++ code, and the C++ can call
into the drivers.  That is done with a amount of C++ to load the
drivers and to export the C++ symbols into the python code at runtime
with ctypes.  A bit of C++ implements the shims for the callbacks from
python -> C++ (which are exported by ctypes).

>  P.S. I want to develop on Linux not Windows.

Should be just the same on both.  Once you've made your setup.py (for
extending python) the build process will work on all supported
architectures.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From david.geldreich at free.fr  Mon May 11 04:49:15 2009
From: david.geldreich at free.fr (r2d3)
Date: Mon, 11 May 2009 01:49:15 -0700 (PDT)
Subject: Compiling Python on Windows : how to deal with modules ?
Message-ID: <b83cb71b-791d-473a-b312-f7643a798f19@s28g2000vbp.googlegroups.com>

Hi Pythoners,

I am using Python embedded in my application (OSX,Windows) and I need
to distribute Python as part of my application.

On OSX, no problem, I got a self contained framework (with dynamic
library and all the modules).

On Windows, I manage to compile Python 2.6.2 with PCbuild\build.bat
and I get python26.dll/python26_d.dll.

But the readme gives no clue about how to deal with the module
"compilation"/installation.

So how do I "compile"/package all the modules that comes with Python
source distribution on Windows ? To embed it in my distribution, I
just copy the whole Modules tree (only pyc/pyo/pyd files ?) ? and set
the right sys.path from my C code (using PySys_SetPath) ?

Thanks in advance.


From gh at ghaering.de  Mon May 11 05:11:46 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Mon, 11 May 2009 11:11:46 +0200
Subject: Learning C++ for Python Development
In-Reply-To: <5d97efc2-af41-4dd6-a243-50f85d54746c@s16g2000vbp.googlegroups.com>
References: <5d97efc2-af41-4dd6-a243-50f85d54746c@s16g2000vbp.googlegroups.com>
Message-ID: <gu8q4i$6tc$1@ger.gmane.org>

joshua.pearce at gmail.com wrote:
> I am a recovering C# web developer who has recently picked up Django
> and I'm loving it.
> 
> I would eventually like to get a job as a Django/Python developer. It
> seems that many Python jobs require that you also be a C++ developer.

I've seen the C++/Python combination in job descriptions, too. ISTM that
these are about systems that are written in C++ and then scripted in
Python. For speeding up Python applications.

> While I want to remain primarily a web developer, I don't want be
> stuck doing CRUD applications, so I would like to learn C++ for Python
> development. 

In the web development field, the probability for doing custom C/C++
development is very low in my experience.

> I have taken two basic programming courses in straight up
> C++, no STL, Boost or anything like that, but I do have a very basic
> knowledge of the language.

Learning progamming languages never hurts, but I'd recommend you learn C
instead, perhaps by using the Python C API (writing small extension
modules).

There are not so many Python extensions written in C++, most are written
in C. C++ usually doesn't buy you enough to warrant using it instead of
C here.

So my advice: go with C. Or learn something more relevant to web
programming. Like improve your JavaScript skills ;-)

> [...]

-- Gerhard



From wojtulek at gmail.com  Mon May 11 05:21:11 2009
From: wojtulek at gmail.com (w.p.)
Date: Mon, 11 May 2009 02:21:11 -0700 (PDT)
Subject: cx_freeze - cannot get importer instance
Message-ID: <8f393e1a-0413-4817-b07c-dc630dc56798@x6g2000vbg.googlegroups.com>

Hello!

My application is frozen with cx_freeze. Everything is ok, but on one
PC with Windows 2003 64bit i got cx_freeze fatal error "cannot get
importer instance". I don't use zipimport in my python code and i
don't know why i get this error :/
Any idea? How test this error?

w.p.


From nick at craig-wood.com  Mon May 11 05:30:04 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 11 May 2009 04:30:04 -0500
Subject: Q's on my first python script
References: <gu6im5$1hi$1@reader1.panix.com>
Message-ID: <slrnh0fpu5.qcl.nick@irishsea.home.craig-wood.com>

kj <socyl at 987jk.com.invalid> wrote:
> 
>  Below is my very firs python script.
> 
>  This was just a learning exercise; the script doesn't do anything
>  terribly exciting: for an argument of the form YYMMDD (year, month,
>  day) it prints out the corresponding string YYMMDDW, where W is a
>  one-letter abbreviation for the day of the week.  E.g.
> 
>  % wd 090511
>  090511M
> 
>  The script runs OK, but I can still see a few areas of improvement,
>  for which I could use your advice.
> 
>  1. The name of the BadArgument exception class defined in the script
>     does not seem to me sufficiently specific.  If one were to import
>     the script in order to reuse its wkday_abbrev function, I'd like
>     this exception's name to be more unequivocally tied to this
>     script.  What I'm looking for is something like a "namespace"
>     for this script.  What's the pythonic way to construct a namespace?
> 
>  2. In some python modules I've seen the idiom
> 
>     if __name__ == "__main__":
>        # run some tests here
> 
>     I'd like to set up tests for this script, mostly to ensure that
>     it handles the error cases properly, but I'm alread using the
>     idiom above to actually run the script under normal operation.
>     What's the typical python idiom for running tests on a *script*
>     (as opposed to a module that is normally not supposed to be run
>     directly)?
> 
>  3. Still on the subject of testing, how does one capture in a
>     variable the output that would normally have gone to stdout or
>     stderr?
> 
>  4. What's the python way to emit warnings?  (The script below should
>     warn the user that arguments after the first one are ignored.)
> 
>  5. The variable wd is meant to be "global" to the script.  In other
>     languages I've programmed in I've seen some typographic convention
>     used for the name of such variables (e.g. all caps) to signal
>     this widened scope.  Does python have such a convention?
> 
>  Any comments/suggestions on these questions, or anything else about
>  the script, would be much appreciated.

To be honest, my first try at this script probably would have looked
quite like yours!  Once it was working I'd have tidied it as below.

  * Put into a class to stop spread of globals
  * WD made class member and upper case
  * 4 space indents as per PEP8
  * remove lamda as it isn't needed
  * only try:/except: the minimum possible amount of code
  * new name for exception


from optparse import OptionParser
import re
import datetime
import sys

class BadDateString(Exception):
    """Malformed date string"""

class Main(object):
    """Script to implement weekday"""
    WD = ("M", "T", "W", "H", "F", "S", "U")
    def wkday_abbrev(self, date_string):
        mm = re.match("(\d{2})(\d{2})(\d{2})\Z", date_string)
        if not mm:
            raise BadDateString("Couldn't match date string from %r" % date_string)
        y, m, d = map(int, mm.groups())
        if y < 38:
            y = y + 1900
        else:
            y = y + 2000
        try:
            return self.WD[datetime.datetime(y, m, d).weekday()]
        except ValueError:
            raise BadDateString("Bad date in %r" % date_string)

    def __init__(self):
        usage = '''Usage: %prog [options] YYMMDD
           %prog -h|--help
'''
        parser = OptionParser(usage=usage)
        parser.add_option("-n", "--no-newline", dest="nonl",
                          action="store_true", help="omit newline in output")
        (options, args) = parser.parse_args();
        try:
            weekday = self.wkday_abbrev(args[0])
        except BadDateString, e:
            print usage
            print e
            sys.exit(1)
        sys.stdout.write("%s%s" % (args[0], weekday))
        if not options.nonl:
            print

if __name__ == "__main__":
    Main()

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nick at craig-wood.com  Mon May 11 05:30:04 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 11 May 2009 04:30:04 -0500
Subject: how GNU stow is complementary rather than alternative to distutils
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<4A059639.7040505@v.loewis.de>
	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
	<4A070C58.4070003@v.loewis.de>
	<mailman.5391.1241978886.11746.python-list@python.org>
Message-ID: <slrnh0fr9i.qcl.nick@irishsea.home.craig-wood.com>

Zooko Wilcox-O'Hearn <zooko at zooko.com> wrote:
>  On May 10, 2009, at 11:18 AM, Martin v. L?wis wrote:
> 
> > If GNU stow solves all your problems, why do you want to use  
> > easy_install in the first place?
> 
>  That's a good question.  The answer is that there are two separate  
>  jobs: building executables and putting them in a directory structure  
>  of the appropriate shape for your system is one job, and installing  
>  or uninstalling that tree into your system is another.  GNU stow does  
>  only the latter.
> 
>  The input to GNU stow is a set of executables, library files, etc.,  
>  in a directory tree that is of the right shape for your system.  For  
>  example, if you are on a Linux system, then your scripts all need to  
>  be in $prefix/bin/, your shared libs should be in $prefix/lib, your  
>  Python packages ought to be in $prefix/lib/python$x.$y/site- 
>  packages/, etc.  GNU stow is blissfully ignorant about all issues of  
>  building binaries, and choosing where to place files, etc. -- that's  
>  the job of the build system of the package, e.g. the "./configure -- 
>  prefix=foo && make && make install" for most C packages, or the  
>  "python ./setup.py install --prefix=foo" for Python packages using  
>  distutils (footnote 1).
> 
>  Once GNU stow has the well-shaped directory which is the output of  
>  the build process, then it follows a very dumb, completely reversible  
>  (uninstallable) process of symlinking those files into the system  
>  directory structure.

Once you've got that well formed directory structure it is very easy
to make it into a package (eg deb or rpm) so that idea is useful in
general for package managers, not just stow.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nick at craig-wood.com  Mon May 11 05:30:04 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 11 May 2009 04:30:04 -0500
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
	<mailman.5400.1242000728.11746.python-list@python.org>
Message-ID: <slrnh0fqu4.qcl.nick@irishsea.home.craig-wood.com>

Rhodri James <rhodri at wildebst.demon.co.uk> wrote:
>  On Sun, 10 May 2009 08:32:23 +0100, Tobias Weber <towb at gmx.net> wrote:
> 
> > In article <m2bpq2ngup.fsf at googlemail.com>,
> >  Arnaud Delobelle <arnodel at googlemail.com> wrote:
> >
> >> A simple Alt-Q will reformat everything nicely.
> >
> > Now that's something. Thanks!
> >
> > (still not gonna use software that doesn't let me type # because it's
> > alt+3 on a UK layout; having to re-learn or configure that is just sick)
> 
>  What on earth are you talking about?  '#' has its own key on a UK layout
>  (shared with '~', but you know what I mean), just to the left of the
>  RETURN key.  Emacs is my editor of choice, and I've never once come
>  across anything like this.

You probably haven't used MAC OS X then!  I vnc to a mac and use emacs
and I just can't type a #.  "Ctrl-Q 43 Return" is my best effort!

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From bruno.42.desthuilliers at websiteburo.invalid  Mon May 11 05:40:03 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 11 May 2009 11:40:03 +0200
Subject: Code - what could be done better?
In-Reply-To: <gu3j48$cig$1@news-cedar.fernuni-hagen.de>
References: <gu3j48$cig$1@news-cedar.fernuni-hagen.de>
Message-ID: <4a07f273$0$29638$426a74cc@news.free.fr>

Florian Wollenschein a ?crit :
> Hi all,
> 
> here's the main code of thc, my txt to html converter. Since I'm a 
> beginner it is far, far, faaaaaaar away from perfect or even good :-)
> What could be done better?
> 
(snip code)

1/ decouple the text => html conversion part from your (or any other) GUI

2/ decouple the text => html conversion part from files handling (hint: 
given your code, any object having a 'write' method should do - IOW, the 
conversion code just a need an object with a "write(somestring)" method 
as argument, eventually defaulting to sys.stdout.

3/ write tags in lowercase, and get rid from the 'bgcolor' attribute in 
<body>

4/ or even better, use a templating system, to avoid hardcoding html in 
your code

Also an FWIW, there are quite a few 'simple markup' text format 
(textile, markdown, ReST, various wiki idioms etc). You may want to be 
able to use them too.

My 2 cents.




From smattehulah at gmail.com  Mon May 11 06:18:25 2009
From: smattehulah at gmail.com (smattehulah at gmail.com)
Date: Mon, 11 May 2009 03:18:25 -0700 (PDT)
Subject: Germany will provide project-specific aid to  pakistan
Message-ID: <c2011d68-13ee-4fe8-8689-b24882559f5f@k9g2000pra.googlegroups.com>

Germany will provide project-specific aid to the tune of 115 million
euro to Pakistan for next two years.
for more details visit www.empiresnews.blogspot.com


From p.f.moore at gmail.com  Mon May 11 06:56:57 2009
From: p.f.moore at gmail.com (Paul Moore)
Date: Mon, 11 May 2009 03:56:57 -0700 (PDT)
Subject: Tutorial or example use for python-graph library
References: <030fcef4-2bf5-4194-97f2-78ce95ca4ef5@v17g2000vbb.googlegroups.com>
	<BZidnUU6s6Y31ZnXnZ2dnUVZ_ridnZ2d@pdx.net>
Message-ID: <5e68ac4d-676b-4fad-ad04-b6335e1decbe@n21g2000vba.googlegroups.com>

On May 8, 4:03?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> Paul Moore wrote:
> > I have just discovered the python-graph library. I've been interested
> > in graph algorithms for a long time, so I'd like to give this a try.
> > But there seems to be very little in the way of examples, or tutorial
> > documentation available. There's the API documentation, but that's not
> > really narrative form. And there are some examples in the
> > distribution, but these seem to be essentially artificial examples,
> > rather than real-world code (and they don't have much in the way of
> > documentation!)
>
> > Are there any reasonably-sized tutorials, or examples of common real-
> > world code, using this package? My google-fu wasn't strong enough to
> > find anything directly :-(
>
> Try writing one yourself, as you are learning the interface. ?The
> package authors will love it, and will probably be overjoyed to
> help you as you stumble.

You're probably right. Some of the concepts (hypergraphs, for example)
are new to me, and I guess I was hoping for some sample code to start
me off understanding what they might be useful for. But I'll go the
other route and search around for some of the theory first and see how
I might apply it, and then try building code from that.

Paul


From p.f.moore at gmail.com  Mon May 11 06:58:40 2009
From: p.f.moore at gmail.com (Paul Moore)
Date: Mon, 11 May 2009 03:58:40 -0700 (PDT)
Subject: Tutorial or example use for python-graph library
References: <030fcef4-2bf5-4194-97f2-78ce95ca4ef5@v17g2000vbb.googlegroups.com>
	<8f032f4b-ae7a-45a0-baeb-82005229be22@n4g2000vba.googlegroups.com>
Message-ID: <b2d2731a-b3fa-42d9-8db7-f93fbfa22363@n8g2000vbb.googlegroups.com>

On May 8, 3:19?pm, "(e.g. emre)" <emregu... at gmail.com> wrote:

> you might want to check networkx as well, it is considerably well
> documented:http://networkx.lanl.gov/

Interesting, I hadn't seen that before. I'll certainly check it out!
Thanks,
Paul


From kalman_g at msn.com  Mon May 11 07:04:00 2009
From: kalman_g at msn.com (GKalman)
Date: Mon, 11 May 2009 04:04:00 -0700 (PDT)
Subject: Importing from a module which contains more than one Class...
In-Reply-To: <c2279eb3-1204-4830-8459-61d2b00b669b@f1g2000prb.googlegroups.com>
References: <23476815.post@talk.nabble.com>
	<c2279eb3-1204-4830-8459-61d2b00b669b@f1g2000prb.googlegroups.com>
Message-ID: <23481160.post@talk.nabble.com>




alex23 wrote:
> 
> GKalman <kalma... at msn.com> wrote:
>> from MyClass import *
>> from MyOtherClass import * ? ? # error msg: no such module!
>>
>> As I mentioned above, ?the code for MyClass & MyOtherClass is in the same
>> file . This program only works with a single Class in a file. That is
>> when
>> the File name is the SAME as the Class name.
>>
>> How to import from a File which contains more than one (unrelated)
>> Classes?
> 
> You seem to have misunderstood how 'import' works, I strongly
> recommend re-reading the tutorial section:
> http://docs.python.org/tutorial/modules.html
> 
> Basically, the import statement has two forms:
> 
>    1. from <module> import <contents>
>    2. import <module>
> 
> So your example of 'from <classname> import *' just doesn't make a lot
> of sense within Python.
> 
> If MyClass.py contains two classes, MyClass and MyOtherClass, you
> should be able to import them with:
> 
>    from MyClass import MyClass, MyOtherClass
> 
> However, you _should_ be already getting _everything_ MyClass.py
> contains as you're using the grab-all asterisk. Could you open a
> python shell in your Module_Class folder, type 'from MyClass import
> MyClass, MyOtherClass', and past whatever traceback you get here?
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
> 

Alex! 
Looks like I did misunderstand how 'import' works. Thanks for your help, now
it works OK.
-- 
View this message in context: http://www.nabble.com/Importing-from-a-module-which-contains-more-than-one-Class...-tp23476815p23481160.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From anuraguniyal at yahoo.com  Mon May 11 08:14:18 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Mon, 11 May 2009 05:14:18 -0700 (PDT)
Subject: unicode bit me
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>
	<mailman.5310.1241809502.11746.python-list@python.org>
	<m2eiuzi92l.fsf@cs.uu.nl> 
	<977863c9-c4d9-4563-985a-3849d6ed0d75@d2g2000pra.googlegroups.com> 
	<mailman.5338.1241882849.11746.python-list@python.org>
	<994147fb-cdf3-4c55-8dc5-62d769b12cdc@u9g2000pre.googlegroups.com>
	<mailman.5346.1241892428.11746.python-list@python.org>
	<m263gagjjl.fsf@cs.uu.nl> 
	<mailman.5350.1241904119.11746.python-list@python.org>
	<5e8242d0-1225-41e6-bc40-3016670b8618@x31g2000prc.googlegroups.com>
	<slrnh0d0gd.mi5.nick@irishsea.home.craig-wood.com>
	<05b9f8b9-c8ea-4591-b81e-d34ed2ccea29@s38g2000prg.googlegroups.com>
	<mailman.5406.1242020840.11746.python-list@python.org>
Message-ID: <08d5f526-aa96-4917-8377-2837ba2fc089@g31g2000pra.googlegroups.com>

On May 11, 10:47?am, Terry Reedy <tjre... at udel.edu> wrote:
> anuraguni... at yahoo.com wrote:
> > so unicode(obj) calls __unicode__ on that object
>
> It will look for the existence of type(ob).__unicode__ ...
>
> ?> and if it isn't there __repr__ is used
>
> According to the below, type(ob).__str__ is tried first.
>
> > __repr__ of list by default return a str even if __repr__ of element
> > is unicode
>
> ?From the fine library manual, built-in functions section:
> (I reccommend using it, along with interactive experiments.)
>
> "repr( object)
> Return a string ..."
>
> "str( [object])
> Return a string ..."
>
> "unicode( [object[, encoding [, errors]]])
>
> Return the Unicode string version of object using one of the following
> modes:
>
> If encoding and/or errors are given, ...
>
> If no optional parameters are given, unicode() will mimic the behaviour
> of str() except that it returns Unicode strings instead of 8-bit
> strings. More precisely, if object is a Unicode string or subclass it
> will return that Unicode string without any additional decoding applied.
>
> For objects which provide a __unicode__() method, it will call this
> method without arguments to create a Unicode string. For all other
> objects, the 8-bit string version or representation is requested and
> then converted to a Unicode string using the codec for the default
> encoding in 'strict' mode.
> "
>
> 'unicode(somelist)' has no optional parameters, so skip to third
> paragraph. ?Somelist is not a unicode instance, so skip to the last
> paragraph. ?If you do dir(list) I presume you will *not* see
> '__unicode__' listed. ?So skip to the last sentence.
> unicode(somelist) == str(somelist).decode(default,'strict').
>
> I do not believe str() and repr() are specifically documented for
> builtin classes other than the general description, but you can figure
> that str(collection) or repr(collection) will call str or repr on the
> members of the collection in order to return a str, as the doc says.
Thanks for the explanation.

> (Details are available by experiment.) ?Str(uni_string) encodes with the
> default encoding, which seems to be 'ascii' in 2.x. ?I am sure it uses
> 'strict' errors.
>
> I would agree that str(some_unicode) could be better documented, like
> unicode(some_str) is.
>
> > so my only solution looks like to use my own list class everywhere i
> > use list
> > class mylist(list):
> > ? ? def __unicode__(self):
> > ? ? ? ? return u"["+u''.join(map(unicode,self))+u"]"
>
> Or write a function and use that instead, or, if and when you can,
> switch to 3.x where str and repr accept and produce unicode.
>
> tjr



From giuott at gmail.com  Mon May 11 08:26:49 2009
From: giuott at gmail.com (Giuseppe Ottaviano)
Date: Mon, 11 May 2009 14:26:49 +0200
Subject: [Python-Dev] how GNU stow is complementary rather than
	alternative to distutils
In-Reply-To: <B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
References: <49D4DA72.60401@v.loewis.de>	<20090407174355.B62983A4063@sparrow.telecommunity.com>	<49E4A58F.70309@egenix.com>	<20090414162603.70C843A4100@sparrow.telecommunity.com>	<49E4F93B.6010802@egenix.com>	<20090415003026.B0A783A4114@sparrow.telecommunity.com>	<49E59202.6050809@egenix.com>	<20090415144147.6845F3A4100@sparrow.telecommunity.com>	<49E60832.8030806@egenix.com>
	<49FB22B5.3040507@simplistix.co.uk>	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>	<4A0590C4.1020904@v.loewis.de>	<20090509143829.17F293A4080@sparrow.telecommunity.com>	<4A059639.7040505@v.loewis.de>	<20090509153716.D44633A4080@sparrow.telecommunity.com>
	<7FF9D9A9-211E-4E5D-BDD0-9C0315123975@zooko.com>
	<4A070C58.4070003@v.loewis.de>
	<B5B7FF1E-0C00-4BCA-945F-147D7E24DC5C@zooko.com>
Message-ID: <6AA82018-2DCA-4F58-BEF9-28D021553247@gmail.com>

Talking of stow, I take advantage of this thread to do some shameless  
advertising :)
Recently I uploaded to PyPI a software of mine, BPT [1], which does  
the same symlinking trick of stow, but it is written in Python (and  
with a simple api) and, more importantly, it allows with another trick  
the relocation of the installation directory (it creates a semi- 
isolated environment, similar to virtualenv).
I find it very convenient when I have to switch between several  
versions of the same packages (for example during development), or I  
have to deploy on the same machine software that needs different  
versions of the dependencies.

I am planning to write an integration layer with buildout and  
easy_install. It should be very easy, since BPT can handle directly  
tarballs (and directories, in trunk) which contain a setup.py.

HTH,
Giuseppe

[1] http://pypi.python.org/pypi/bpt
P.S. I was not aware of stow, I'll add it to the references and see if  
there are any features that I can steal




From michele.simionato at gmail.com  Mon May 11 08:37:59 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 11 May 2009 05:37:59 -0700 (PDT)
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
Message-ID: <bf94f564-8531-47b0-9e11-a7813eeddd5c@n4g2000vba.googlegroups.com>

On May 8, 5:33?pm, Mikael Olofsson <mik... at isy.liu.se> wrote:

> ?>>> class test_decorator(object):
> ... ? ? def __init__(self,func):
> ... ? ? ? ? self._func = func
> ... ? ? def __call__(self, *args):
> ... ? ? ? ? print 'Decorator:', args
> ... ? ? ? ? self._func(*args)

Or you could use the decorator module (http://pypi.python.org/pypi/
decorator):

from decorator import decorator

@decorator
def test_decorator(func, *args, **kw):
   print 'Decorator:', args
   return func(*args)


From aahz at pythoncraft.com  Mon May 11 08:46:18 2009
From: aahz at pythoncraft.com (Aahz)
Date: Mon, 11 May 2009 05:46:18 -0700
Subject: Switchover: mail.python.org
Message-ID: <20090511124618.GA19400@panix.com>

On Monday 2009-05-11, mail.python.org will be switched to another machine
starting roughly at 14:00 UTC.  This should be invisible (expected
downtime is less than ten minutes).
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From bruno.42.desthuilliers at websiteburo.invalid  Mon May 11 09:12:12 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 11 May 2009 15:12:12 +0200
Subject: Why there is a parameter named "self" for classmethod function?
In-Reply-To: <mailman.5206.1241671190.11746.python-list@python.org>
References: <2b767f890905061949g12d0bf03m68c6b466ffedfbd9@mail.gmail.com>	<4A024F18.9080407@kbsymanzik.org>
	<mailman.5206.1241671190.11746.python-list@python.org>
Message-ID: <4a08242b$0$24000$426a34cc@news.free.fr>

Terry Reedy a ?crit :
> Kurt Symanzik wrote:
> 
>>
>> But you might consider decorating the method as a static method 
>> instead since in your example you are not using the parameter at all.  
>> A static method would not require a parameter.
>>
>> @staticmethod
>> def print_hello():
>>     print "hello"
> 
> Functions that refer to neither the class nor an instance thereof can 
> usually be moved outside the class altogether.  Python is not Java.

Indeed. But there are a couple uses for staticmethods - one of them 
being polymorphic dispatch on the receiver object. And yes, I know, 
modules are objects too, but this is not always an option (legacy code, 
integration with a framework etc).



From eckhardt at satorlaser.com  Mon May 11 09:33:03 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 11 May 2009 15:33:03 +0200
Subject: Skipping unit tests
Message-ID: <f1mld6-v1j.ln1@satorlaser.homedns.org>

Hi!

We have a few tests for some module here. These tests are under development
and applied to older versions (with less features) of the module, too. That
means that if I have module version 42, tests A and B can not possibly
work. I don't want to have test failures but I also don't want to fork the
test suite, so how do I get the tests to behave like Python's test suite,
which also skips some "expected failures".

Thank you!

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From justin.donato at gmail.com  Mon May 11 09:51:42 2009
From: justin.donato at gmail.com (justind)
Date: Mon, 11 May 2009 06:51:42 -0700 (PDT)
Subject: win32 How to make sure a file is completely written?
Message-ID: <6b33c5b3-ae51-4245-a3d5-28d48b76dd07@j12g2000vbl.googlegroups.com>

Hello,

I'm using http://code.activestate.com/recipes/156178/ to watch a
folder in windows. It's working perfectly, but sometimes when I try to
open the file immediately after receiving the event, it's not ready to
be opened--if I try to open it with PIL I get "IOError: cannot
identify image file" and if I try it with a text file, it's empty.
This doesn't happen all the time, just occasionally. I think the
problem is that the file isn't completely written because if I make
the script sleep for a second, it works every time. But that doesn't
seem very elegant or robust.

What's the proper way to make sure the file is ready to be read?

I'm just passing the file names from the above recipe to a function.
Something like

def handler(files):
    for file in files:
        im = Image.open(file)

Thanks




From mabdelkader at gmail.com  Mon May 11 10:02:21 2009
From: mabdelkader at gmail.com (ma)
Date: Mon, 11 May 2009 10:02:21 -0400
Subject: win32 How to make sure a file is completely written?
In-Reply-To: <6b33c5b3-ae51-4245-a3d5-28d48b76dd07@j12g2000vbl.googlegroups.com>
References: <6b33c5b3-ae51-4245-a3d5-28d48b76dd07@j12g2000vbl.googlegroups.com>
Message-ID: <148918f0905110702q13f514a8k7e884b5a152d1394@mail.gmail.com>

You have to wait until IO is ready. In Unix, we accomplish this with
fcntl and the default signal SIGIO, I am not sure how you would do
this in Windows.


On Mon, May 11, 2009 at 9:51 AM, justind <justin.donato at gmail.com> wrote:
> Hello,
>
> I'm using http://code.activestate.com/recipes/156178/ to watch a
> folder in windows. It's working perfectly, but sometimes when I try to
> open the file immediately after receiving the event, it's not ready to
> be opened--if I try to open it with PIL I get "IOError: cannot
> identify image file" and if I try it with a text file, it's empty.
> This doesn't happen all the time, just occasionally. I think the
> problem is that the file isn't completely written because if I make
> the script sleep for a second, it works every time. But that doesn't
> seem very elegant or robust.
>
> What's the proper way to make sure the file is ready to be read?
>
> I'm just passing the file names from the above recipe to a function.
> Something like
>
> def handler(files):
> ? ?for file in files:
> ? ? ? ?im = Image.open(file)
>
> Thanks
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From mail at timgolden.me.uk  Mon May 11 10:03:34 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 11 May 2009 15:03:34 +0100
Subject: win32 How to make sure a file is completely written?
In-Reply-To: <6b33c5b3-ae51-4245-a3d5-28d48b76dd07@j12g2000vbl.googlegroups.com>
References: <6b33c5b3-ae51-4245-a3d5-28d48b76dd07@j12g2000vbl.googlegroups.com>
Message-ID: <4A083036.90609@timgolden.me.uk>

justind wrote:
> Hello,
> 
> I'm using http://code.activestate.com/recipes/156178/ to watch a
> folder in windows. 

Wow, that takes me back. There's a bit more info (and a different
technique) here if you're interested:

  http://timgolden.me.uk/python/win32_how_do_i/watch_directory_for_changes.html

But to come back your question...

> It's working perfectly, but sometimes when I try to
> open the file immediately after receiving the event, it's not ready to
> be opened--if I try to open it with PIL I get "IOError: cannot
> identify image file" and if I try it with a text file, it's empty.
> This doesn't happen all the time, just occasionally. I think the
> problem is that the file isn't completely written because if I make
> the script sleep for a second, it works every time. But that doesn't
> seem very elegant or robust.
> 
> What's the proper way to make sure the file is ready to be read?

I don't believe there's an easy answer to this question. From the
filesystem's point of view some process creates a file. So it
tells you that a file has been created. The filesystem has no 
knowledge of when a file is "complete". It could -- altho' it
doesn't -- fire an event when a handle on that file is closed,
but even that wouldn't tell you much: you'd have to be able
to distinguish between the handle which is behind the data
you're looking for and a handle from a virus scanner which is
checking the new file for malware.


To add difficulty, when Windows initiates a file copy (as opposed
to creating a new file) it immediately creates the file at its
full size and then copies data in. Which makes some sense as it
should avoid some element of fragmentation etc. But it removes
one of your options: noting the size of an original file and
comparing it with the size of a copy.

So I think you're out of luck and you're going to have to
put a try-except loop in place.

TJG


From mikael at isy.liu.se  Mon May 11 10:06:11 2009
From: mikael at isy.liu.se (Mikael Olofsson)
Date: Mon, 11 May 2009 16:06:11 +0200
Subject: Decorating methods - where do my arguments go?
In-Reply-To: <gu1n81$ir7$03$1@news.t-online.com>
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
Message-ID: <gu8u7s$l1$1@news.lysator.liu.se>

Peter Otten wrote:
> You have to turn your decorator into a descriptor by providing a __get__() 
> method. A primitive example:
> 
> class test_decorator(object):
>     def __init__(self,func):
>         self._func = func
>     def __call__(self, *args):
>         print 'Decorator:', args
>         self._func(self.inst, *args)
>     def __get__(self, inst, cls):
>         self.inst = inst
>         return self

Thanks! Works perfectly for methods, as far as I can see. That's 
perfectly OK, since that is what I was asking for. What I failed to 
include in my original post is that I intend to use the decorator for 
functions as well. The above fails for functions on the second row of 
__call__ with

     AttributeError: 'test_decorator' object has no attribute 'inst'

It seems to me like __get__ is not called when decorating a function. I 
guess there's no reasonable value for inst in that case. It might be the 
function itself, but it doesn't make sense to call the function with 
itself as its first argument, when it isn't supposed to be called that way.

George Sakkis decorator function solution seems to work equally well for 
functions and methods. However, I prefer the cleaner encapsulation given 
by a class. Based on those observations, I think I will use the 
following approach:

 >>> class test_decorator(object):
...     _inst = None
...     def __init__(self,func):
...         self._func = func
...     def __call__(self, *args):
...         print 'Decorator:', args
...         if self._inst is None:
...             print 'We seem to be decorating a function.'
...             self._func(*args)
...         else:
...             print 'We seem to be decorating a method.'
...             self._func(self._inst,*args)
...     def __get__(self, inst, cls):
...         self._inst = inst
...         return self
...
 >>>
 >>> @test_decorator
... def func(*args):
...     print 'Function: ', args
...
 >>>
 >>> func(1,2,3)
Decorator: (1, 2, 3)
We seem to be decorating a function.
Function:  (1, 2, 3)
 >>>
 >>> class cls(object):
...     @test_decorator3
...     def meth(self,*args):
...         print 'Method:   ', args
...
 >>>
 >>> cls().meth(1,2,3)
Decorator: (1, 2, 3)
We seem to be decorating a method.
Method:    (1, 2, 3)

If there are any drawbacks with this approach that I fail to see, please 
enlighten me.

/MiO


From mikael at isy.liu.se  Mon May 11 10:06:26 2009
From: mikael at isy.liu.se (Mikael Olofsson)
Date: Mon, 11 May 2009 16:06:26 +0200
Subject: Decorating methods - where do my arguments go?
In-Reply-To: <b3b6788c-42ad-4c65-b999-48f420e90630@o20g2000vbh.googlegroups.com>
References: <gu167u$svk$1@news.lysator.liu.se>
	<b3b6788c-42ad-4c65-b999-48f420e90630@o20g2000vbh.googlegroups.com>
Message-ID: <gu8u8a$l1$2@news.lysator.liu.se>

George Sakkis wrote:
> Yes, just return an actual function from the decorator instead of a
> callable object:
> 
> def test_decorator2(func):
>     def wrapper(*args):
>         print 'Decorator2:', args
>         func(*args)
>     return wrapper
> 
> 
> class cls(object):
>     @test_decorator
>     def meth(self,*args):
>         print 'Method:   ', args
> 
>     @test_decorator2
>     def meth2(self,*args):
>         print 'Method2:   ', args

Thanks! This has the merit over Peter's solution that it seems to work 
for both functions and methods. However, as you can see from my answer 
to Peter, I think I will go for a class based approach anyway. Still, 
your answer helped me grasping the concepts.

/MiO


From justin.donato at gmail.com  Mon May 11 10:12:12 2009
From: justin.donato at gmail.com (justind)
Date: Mon, 11 May 2009 07:12:12 -0700 (PDT)
Subject: win32 How to make sure a file is completely written?
References: <6b33c5b3-ae51-4245-a3d5-28d48b76dd07@j12g2000vbl.googlegroups.com>
	<mailman.5418.1242050605.11746.python-list@python.org>
Message-ID: <2cd511d8-7789-4f47-9b99-616205f9794c@t10g2000vbg.googlegroups.com>

On May 11, 10:03?am, Tim Golden <m... at timgolden.me.uk> wrote:
> justind wrote:
> > Hello,
>
> > I'm usinghttp://code.activestate.com/recipes/156178/to watch a
> > folder in windows.
>
> Wow, that takes me back. There's a bit more info (and a different
> technique) here if you're interested:
>
> ?http://timgolden.me.uk/python/win32_how_do_i/watch_directory_for_chan...
>
> But to come back your question...
>
> > It's working perfectly, but sometimes when I try to
> > open the file immediately after receiving the event, it's not ready to
> > be opened--if I try to open it with PIL I get "IOError: cannot
> > identify image file" and if I try it with a text file, it's empty.
> > This doesn't happen all the time, just occasionally. I think the
> > problem is that the file isn't completely written because if I make
> > the script sleep for a second, it works every time. But that doesn't
> > seem very elegant or robust.
>
> > What's the proper way to make sure the file is ready to be read?
>
> I don't believe there's an easy answer to this question. From the
> filesystem's point of view some process creates a file. So it
> tells you that a file has been created. The filesystem has no
> knowledge of when a file is "complete". It could -- altho' it
> doesn't -- fire an event when a handle on that file is closed,
> but even that wouldn't tell you much: you'd have to be able
> to distinguish between the handle which is behind the data
> you're looking for and a handle from a virus scanner which is
> checking the new file for malware.
>
> To add difficulty, when Windows initiates a file copy (as opposed
> to creating a new file) it immediately creates the file at its
> full size and then copies data in. Which makes some sense as it
> should avoid some element of fragmentation etc. But it removes
> one of your options: noting the size of an original file and
> comparing it with the size of a copy.
>
> So I think you're out of luck and you're going to have to
> put a try-except loop in place.
>
> TJG

Thanks Guys.


From denis.papathanasiou at gmail.com  Mon May 11 10:39:14 2009
From: denis.papathanasiou at gmail.com (dpapathanasiou)
Date: Mon, 11 May 2009 07:39:14 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<12ef7b00-f0c5-4030-a353-533d93d23cdd@r3g2000vbp.googlegroups.com> 
	<794f117f-4df5-4c6c-be68-f901959b2579@y10g2000prc.googlegroups.com>
Message-ID: <d64eeab4-f07c-4f06-a70c-0c78278b2c2f@r34g2000vba.googlegroups.com>


> His problem is therefore likely to be something completely different.

You are correct.

As per the earlier advice, I switched from mod_python to mod_wsgi but
I still see the same error:

[Mon May 11 10:30:21 2009] [notice] Apache/2.2.11 (Unix) mod_wsgi/2.4
Python/2.5.2 configured -- resuming normal operations
[Mon May 11 10:30:26 2009] [error] Traceback (most recent call last):
[Mon May 11 10:30:26 2009] [error]   File "../db/items_db.py", line
38, in <lambda>
[Mon May 11 10:30:26 2009] [error]     db_object.associate(sdb_object,
(lambda primary_key, primary_data:xml_utils.parse_item_attribute
(primary_data, attribute)))
[Mon May 11 10:30:26 2009] [error]   File "../common/xml_utils.py",
line 80, in parse_item_attribute
[Mon May 11 10:30:26 2009] [error]     item_doc = minidom.parseString
(item)
[Mon May 11 10:30:26 2009] [error]   File "/usr/lib/python2.5/xml/dom/
minidom.py", line 1924, in parseString
[Mon May 11 10:30:26 2009] [error]     from xml.dom import
expatbuilder
[Mon May 11 10:30:26 2009] [error] SystemError: Parent module
'xml.dom' not loaded
[Mon May 11 10:30:26 2009] [error] Traceback (most recent call last):
[Mon May 11 10:30:26 2009] [error]   File "../db/items_db.py", line
38, in <lambda>
[Mon May 11 10:30:26 2009] [error]     db_object.associate(sdb_object,
(lambda primary_key, primary_data:xml_utils.parse_item_attribute
(primary_data, attribute)))
[Mon May 11 10:30:26 2009] [error]   File "../common/xml_utils.py",
line 80, in parse_item_attribute
[Mon May 11 10:30:26 2009] [error]     item_doc = minidom.parseString
(item)
[Mon May 11 10:30:26 2009] [error]   File "/usr/lib/python2.5/xml/dom/
minidom.py", line 1924, in parseString
[Mon May 11 10:30:26 2009] [error]     from xml.dom import
expatbuilder
[Mon May 11 10:30:26 2009] [error] SystemError: Parent module
'xml.dom' not loaded

The odd thing is that when xml_utils.py is run outside of either
apache module, xml.dom does load, and the minidom parsing works.

I'm not sure why this is happening, but the next thing I'll do is try
replacing minidom with ElementTree, and see if that has any issues
running under either apache module.


From agaskins_ng at kelleramerica.com  Mon May 11 10:53:38 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Mon, 11 May 2009 10:53:38 -0400
Subject: OOP & Abstract Classes
Message-ID: <SZWNl.16133$hX2.2435@newsfe19.iad>

Hi all,

-- Non critical info--
I am a fairly seasoned PHP developer (don't shoot, I'm changing teams!:) who 
is admittedly behind the curve with OOP. Like most who learned PHP, I 
started doing web app backend stuff, but I have moved to full blown windows 
apps in the last 6 months using Winbinder. As you may know Winbinder is 
essentially abandoned, and programming windows apps with Winbinder or even 
GTK-PHP is less than ideal. I also deal heavily in serial/rs-232 
communications which is a pain in PHP. Long story short, I'm tired of doing 
things in such a hackish manner and want to write applications that are 
cross platform (I'd like to get our production dept on linux eventually) and 
truely object oriented.
-- END non critical stuff--

So I was beginning to learn OOP for PHP, and it seemed to me that abstract 
classes were just right for my application. In my application I must 
communicate with several peices of test equipment that communicate via 
RS-232. Most use SCPI instructions, some do not and require low level 
communication.

The way I understand abstract classes is that I could have a class that has 
all my abstract methods such as 'init', 'getMeasurement', 'setPressure', 
etc... then I could use this common interface to to control my different 
pieces of hardware (after I write a library for each of them).

Is this a valid application for abstract classes? Or am I making life more 
complicated than it need be?

Now, I have read that Pythons OOP implimentation is so much better and more 
complete then PHP's, but I cant find anything about abstract classes except 
this:
http://norvig.com/python-iaq.html

...which says it doesn't exist in Python and you can only do this hack to 
make it work (and I don't particularly understand how to impliment it from 
this article).

This makes me suspect I am making things more comlicated than they need to 
be. Could someone help me understand the proper way to impliment a set 
classes/methods to deal with several peices of similar and not so similar 
hardware? Not looking for anyone to write code for me, just help 
understanding some of these OOP concepts and how they would apply to my 
situation.

Thanks!
-Adam 




From marco at sferacarta.com  Mon May 11 10:58:57 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Mon, 11 May 2009 16:58:57 +0200
Subject: Pycon Tre, grazie!
In-Reply-To: <470a7d8f-0bd0-4b17-92b2-6c703ecad2fe@o14g2000vbo.googlegroups.com>
References: <470a7d8f-0bd0-4b17-92b2-6c703ecad2fe@o14g2000vbo.googlegroups.com>
Message-ID: <S2XNl.12126$Ux.1158@tornado.fastwebnet.it>

daniele wrote:

> Si ? concluso ieri la pycon tre, ? stata molto interessante, un bel
> evento per una bella comunit?.

Sempre meglio.. anche se mi preoccupa un po' un eventuale cambio di location

> Ho visto con grande piacere, oltre all'incremento dei partecipanti,
> anche un sensibile incremento delle partecipanti!

Si'... in particolare durante il talk di Raymond :)


From eckhardt at satorlaser.com  Mon May 11 11:13:10 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 11 May 2009 17:13:10 +0200
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
Message-ID: <6trld6-98j.ln1@satorlaser.homedns.org>

Adam Gaskins wrote:
> Long story short, I'm tired of doing things in such a hackish manner
> and want to write applications that are cross platform (I'd like to
> get our production dept on linux eventually) and truely object
> oriented. 

Adam, there is one notion here that I seriously dislike: you sound as if OOP
was a goal by itself for you. The point is that OOP is a tool, not a goal.
So, if it helps you do the things you really want, go ahead and use it.
Otherwise, just don't.

> The way I understand abstract classes is that I could have a class that
> has all my abstract methods such as 'init', 'getMeasurement',
> 'setPressure', etc... then I could use this common interface to to control
> my different pieces of hardware (after I write a library for each of
> them).
> 
> Is this a valid application for abstract classes? Or am I making life more
> complicated than it need be?

I think that the term is rather "abstract base class" (ABC,
a.k.a. "interface"). Note that in Python, where you don't have to use
prototypes or declaration, you often don't do that. Instead you use "duck
typing", i.e. you simply create different classes for the different
hardware and if all of them support 'init' and 'setPressure' instances are
interchangeable ("Liskov substitution principle", IIRC) without knowing
anything about each other.

> This makes me suspect I am making things more comlicated than they need to
> be. Could someone help me understand the proper way to impliment a set
> classes/methods to deal with several peices of similar and not so similar
> hardware?

Just write a class for each piece and adhere to a common interface and
you're done.

;)

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From duncan.booth at invalid.invalid  Mon May 11 11:17:55 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 11 May 2009 15:17:55 GMT
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
	<gu8u7s$l1$1@news.lysator.liu.se>
Message-ID: <Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>

Mikael Olofsson <mikael at isy.liu.se> wrote:

> George Sakkis decorator function solution seems to work equally well 
for 
> functions and methods. However, I prefer the cleaner encapsulation 
given 
> by a class. Based on those observations, I think I will use the 
> following approach:
> 
> >>> class test_decorator(object):
> ...     _inst = None
> ...     def __init__(self,func):
> ...         self._func = func
> ...     def __call__(self, *args):
> ...         print 'Decorator:', args
> ...         if self._inst is None:
> ...             print 'We seem to be decorating a function.'
> ...             self._func(*args)
> ...         else:
> ...             print 'We seem to be decorating a method.'
> ...             self._func(self._inst,*args)
> ...     def __get__(self, inst, cls):
> ...         self._inst = inst
> ...         return self
> ...

The __get__ method should be returning a new object, NOT modifying the 
state of the decorator. As written it will break badly and unexpectedly 
in a variety of situations:

>>> inst1 = cls()
>>> inst2 = cls()
>>> inst1, inst2
(<__main__.cls object at 0x011BC470>, <__main__.cls object at 
0x011BCC90>)
>>> m = inst1.meth
>>> m()
Decorator: ()
We seem to be decorating a method.
Method:    <__main__.cls object at 0x011BC470> ()
>>> inst2.meth()
Decorator: ()
We seem to be decorating a method.
Method:    <__main__.cls object at 0x011BCC90> ()
>>> m()
Decorator: ()
We seem to be decorating a method.
Method:    <__main__.cls object at 0x011BCC90> ()

or even this:

>>> inst1.meth(inst2.meth())
Decorator: ()
We seem to be decorating a method.
Method:    <__main__.cls object at 0x011BCC90> ()
Decorator: (None,)
We seem to be decorating a method.
Method:    <__main__.cls object at 0x011BCC90> (None,)



-- 
Duncan Booth http://kupuguy.blogspot.com


From socyl at 987jk.com.invalid  Mon May 11 11:19:05 2009
From: socyl at 987jk.com.invalid (kj)
Date: Mon, 11 May 2009 15:19:05 +0000 (UTC)
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net>
Message-ID: <gu9fl8$nmh$1@reader1.panix.com>

In <w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d at pdx.net> Scott David Daniels <Scott.Daniels at Acm.Org> writes:

>kj wrote:
>> ...  I can't come with an example in which the same couldn't be
>> accomplished with
>> 
>> try:
>>     # do something
>>     # do something else
>> except ...:
>>     # handle exception
>> 
>> The only significant difference I can come up with is that in the
>> second form, the except clause may be masking some unexpected
>> exceptions from the "do something else" part.  Is this the rationale
>> behind this else clause?  Or is there something more to it?

>Yes, in a way.  The idea of catching particular exceptions is to only
>handle exceptions you expect (let the others go out to more general
>reporters).  So, not only should you choose the tightest exception to
>catch that you can, but you should look for it in a very narrow window:
>exactly where you expect it.

>     try:
>         v = mumble.field
>     except AttributeError:
>         pass
>     else:
>         sys.warning('field was actually there?')

>as opposed to:

>     try:
>         v = mumble.field
>         sys.warning('field was actually there?')
>     except AttributeError:
>         pass

>The idea is to make it clear what you expect might go
>wrong that you are prepared to handle.

Wow.  As rationales for syntax constructs go, this has got to be
the most subtle one I've ever seen...

Thanks!

kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From aahz at pythoncraft.com  Mon May 11 11:22:10 2009
From: aahz at pythoncraft.com (Aahz)
Date: 11 May 2009 08:22:10 -0700
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
References: <mailman.5282.1241783298.11746.python-list@python.org>
	<gu6i38$jhk$1@panix3.panix.com>
	<mailman.5375.1241962005.11746.python-list@python.org>
Message-ID: <gu9fr2$je5$1@panix3.panix.com>

In article <mailman.5375.1241962005.11746.python-list at python.org>,
Geoff Gardiner  <ggardiner at iee.org> wrote:
>Aahz wrote:
>> 
>> What directory are you running this from?  What happens if you switch to
>> running "python Lib/test/regrtest.py"?  Taking a closer look, this looks
>> more like a plain import error.
>
>I couldn't do quite that because there's no Lib, but instead (in Ubuntu
>Hardy, this time):
>....
>gegard at gegard:~$ cd /usr/lib/python2.5/
>gegard at gegard:/usr/lib/python2.5$ python test/regrtest.py
>
>9 tests skipped:
>    test_builtin test_doctest test_doctest2 test_exceptions
>    test_grammar test_opcodes test_operations test_types test_unittest
>Traceback (most recent call last):
>  File "test/regrtest.py", line 1384, in <module>
>    main()
>  File "test/regrtest.py", line 416, in main
>    e = _ExpectedSkips()
>  File "test/regrtest.py", line 1321, in __init__
>    from test import test_socket_ssl
>ImportError: cannot import name test_socket_ssl
>gegard at gegard:/usr/lib/python2.5$
>
>Also
>gegard at gegard:~$ locate */test_socket_ssl.*
>gegard at gegard:~$ #returns nothing
>
>And
>gegard at gegard:~$ locate /usr/lib/python2.5/test/test_*.*
>/usr/lib/python2.5/test/test_support.py
>/usr/lib/python2.5/test/test_support.pyc
>gegard at gegard:~$

That seems to demonstrate that regrtest.py is indeed a good mechanism for
finding out whether it's a b0rked install!
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From kyosohma at gmail.com  Mon May 11 11:22:25 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 11 May 2009 08:22:25 -0700 (PDT)
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
Message-ID: <74c79941-af9b-4b43-b02b-8316b108f08d@l28g2000vba.googlegroups.com>

On May 11, 9:53?am, "Adam Gaskins" <agaskins... at kelleramerica.com>
wrote:
> Hi all,
>
> -- Non critical info--
> I am a fairly seasoned PHP developer (don't shoot, I'm changing teams!:) who
> is admittedly behind the curve with OOP. Like most who learned PHP, I
> started doing web app backend stuff, but I have moved to full blown windows
> apps in the last 6 months using Winbinder. As you may know Winbinder is
> essentially abandoned, and programming windows apps with Winbinder or even
> GTK-PHP is less than ideal. I also deal heavily in serial/rs-232
> communications which is a pain in PHP. Long story short, I'm tired of doing
> things in such a hackish manner and want to write applications that are
> cross platform (I'd like to get our production dept on linux eventually) and
> truely object oriented.
> -- END non critical stuff--
>
> So I was beginning to learn OOP for PHP, and it seemed to me that abstract
> classes were just right for my application. In my application I must
> communicate with several peices of test equipment that communicate via
> RS-232. Most use SCPI instructions, some do not and require low level
> communication.
>
> The way I understand abstract classes is that I could have a class that has
> all my abstract methods such as 'init', 'getMeasurement', 'setPressure',
> etc... then I could use this common interface to to control my different
> pieces of hardware (after I write a library for each of them).
>
> Is this a valid application for abstract classes? Or am I making life more
> complicated than it need be?
>
> Now, I have read that Pythons OOP implimentation is so much better and more
> complete then PHP's, but I cant find anything about abstract classes except
> this:http://norvig.com/python-iaq.html
>
> ...which says it doesn't exist in Python and you can only do this hack to
> make it work (and I don't particularly understand how to impliment it from
> this article).
>
> This makes me suspect I am making things more comlicated than they need to
> be. Could someone help me understand the proper way to impliment a set
> classes/methods to deal with several peices of similar and not so similar
> hardware? Not looking for anyone to write code for me, just help
> understanding some of these OOP concepts and how they would apply to my
> situation.
>
> Thanks!
> -Adam

I've never used (or heard of) the Abstract type...and the guy who
wrote the FAQ was being a jerk. It looks like he was just throwing in
an undefined variable name just to make his Python program break while
taking a pot shot at people who use that sort of thing. Whatever.

According to wikipedia, dynamic languages don't implement Abstract as
they can accomplish the same thing via duck typing:
http://en.wikipedia.org/wiki/Abstract_class .  The way it describes
the class, it made me think of decorators as well.

Hopefully someone who has used Abstract classes will jump in here and
give you more information about whether or not they matter in Python.

Mike


From denis.papathanasiou at gmail.com  Mon May 11 11:59:20 2009
From: denis.papathanasiou at gmail.com (dpapathanasiou)
Date: Mon, 11 May 2009 08:59:20 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<12ef7b00-f0c5-4030-a353-533d93d23cdd@r3g2000vbp.googlegroups.com> 
	<794f117f-4df5-4c6c-be68-f901959b2579@y10g2000prc.googlegroups.com> 
	<d64eeab4-f07c-4f06-a70c-0c78278b2c2f@r34g2000vba.googlegroups.com>
Message-ID: <037bc6d0-3d2e-45bd-91d3-d3051fbfa149@s31g2000vbp.googlegroups.com>

For the record, and in case anyone else runs into this particular
problem, here's how resolved it.

My original xml_utils.py was written this way:

from xml.dom import minidom

def parse_item_attribute (item, attribute_name):
    item_doc = minidom.parseString(item)
    ...

That version worked under the python interpreter, but failed under
both mod_python and mod_wsgi apache modules with an error ("Parent
module 'xml.dom' not loaded").

I found that changing the import statement and the minidom reference
within the function resolved the problem.

I.e., after rewriting xml_utils.py this way, it works under both
apache modules as well as in the python interpreter:

import xml.dom.minidom

def parse_item_attribute (item, attribute_name):
    item_doc = xml.dom.minidom.parseString(item)
    ...



From marco at sferacarta.com  Mon May 11 11:59:31 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Mon, 11 May 2009 17:59:31 +0200
Subject: OOP & Abstract Classes
In-Reply-To: <74c79941-af9b-4b43-b02b-8316b108f08d@l28g2000vba.googlegroups.com>
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
	<74c79941-af9b-4b43-b02b-8316b108f08d@l28g2000vba.googlegroups.com>
Message-ID: <EXXNl.12201$Ux.6636@tornado.fastwebnet.it>

Mike Driscoll wrote:

> I've never used (or heard of) the Abstract type...and the guy who
> wrote the FAQ was being a jerk.

Who, Peter Norvig?

(from wikipedia)

Peter Norvig is an American computer scientist. He is currently the 
Director of Research (formerly Director of Search Quality) at Google Inc.

He is a Fellow and Councilor of the American Association for Artificial 
Intelligence and co-author, with Stuart Russell, of Artificial 
Intelligence: A Modern Approach, now the standard college text. He 
previously was head of the Computational Sciences Division (now the 
Intelligent Systems Division) at NASA Ames Research Center, where he 
oversaw a staff of 200 scientists performing NASA's research and 
development in autonomy and robotics, automated software engineering and 
data analysis, neuroengineering, collaborative systems research, and 
simulation-based decision-making. Before that he was Chief Scientist at 
Junglee, where he helped develop one of the first Internet comparison 
shopping services; Chief designer at Harlequin Inc.; and Senior 
Scientist at Sun Microsystems Laboratories.

etc. etc.


Yes, I usually look up in wikipedia before calling anyone a jerk :) :)


From mikael at isy.liu.se  Mon May 11 12:04:04 2009
From: mikael at isy.liu.se (Mikael Olofsson)
Date: Mon, 11 May 2009 18:04:04 +0200
Subject: Decorating methods - where do my arguments go?
In-Reply-To: <Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
	<gu8u7s$l1$1@news.lysator.liu.se>
	<Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>
Message-ID: <gu954t$29r$1@news.lysator.liu.se>

Duncan Booth wrote:

> The __get__ method should be returning a new object, NOT modifying the 
> state of the decorator. As written it will break badly and unexpectedly 
> in a variety of situations:
> 
> [snip good examples of things going bad]

Ouch! So, does that mean that George's solution based on a function is 
the way to go, or does that mean that my __call__ should analyze the 
passed callable?

/MiO


From iwan at reahl.org  Mon May 11 12:19:41 2009
From: iwan at reahl.org (Iwan)
Date: Mon, 11 May 2009 09:19:41 -0700 (PDT)
Subject: How to debug this import problem?
References: <mailman.5300.1241802485.11746.python-list@python.org> 
	<76j8vcF1crfkoU1@mid.uni-berlin.de>
	<DumdnY8P7-xs65nXnZ2dnUVZ_jidnZ2d@pdx.net> 
	<ebc63140-6f1f-44a0-8046-574fb3530fed@s21g2000vbb.googlegroups.com>
Message-ID: <9b48b208-f656-4de0-9fd7-2aec9394cc2c@q2g2000vbr.googlegroups.com>

Mmm, we solved half of the cause of this one.

Test runs are kicked off via setuptools's test command. But this
happens programmatically, and successively in one process.  But
setuptools's test command clears all modules imported during a test
run from sys.modules - hence it is intended that modules would be re-
imported.

Why certain of our code managed to still get to the classes contained
in prior imports is still a mystery though.

-Iwan


From gazathome at gmail.com  Mon May 11 12:27:16 2009
From: gazathome at gmail.com (gazathome at gmail.com)
Date: Mon, 11 May 2009 09:27:16 -0700 (PDT)
Subject: Writing text to a Word Document
Message-ID: <8ba265c9-4697-41b4-a117-04761a86a945@g20g2000vba.googlegroups.com>

Hi everyone,

I am trying to write several attributes from a database table and
using the code below I can write the values however it is only
overwriting on the first line.

I am new to the win32com bit and I would like to know what is the
recommended reference to loop down the page and add multiple records
rather than the worddoc.Content.

I have read a little about writing this to an RTF or htmol but I am
getting information overload and going nowhere.  Does anyone have a
nice tutorial out there that simply explains how to do this?

Much appreciated for any thoughts.

Cheers,

Gareth

import win32com.client, arcgisscripting, sys, os
gp = arcgisscripting.create(9.3)

#Create word document component - http://www.faqts.com/knowledge_base/view.phtml/aid/37034/fid/244
wordapp = win32com.client.Dispatch("Word.Application") # Create new
Word Object
wordapp.Visible = 1 # Word Application should`t be visible
worddoc = wordapp.Documents.Add() # Create new Document Object
worddoc.Content.Font.Size = 11
worddoc.Content.Paragraphs.TabStops.Add (100)

#Setup of GDB Connection
# Get the Featureclass from the Mobel - Property Box
PropBox = "C:\\Avon Fire Rescue\\data\AvonFire_1.gdb\\PropertyBox"

# Make a search cursor for the Property Box Feature class
PBselCur = gp.searchcursor(PropBox)
PBrow = PBselCur.reset()
PBrow = PBselCur.next()

#Using the search cursor get the Premise ID from a Property box

while PBrow:
    PBrowVal = PBrow.getvalue("PremisesID")
    #Add data to Word Document
    worddoc.Content.Text = (PBrowVal)
    PBrow = PBselCur.next()

#worddoc.Close() # Close the Word Document (a save-Dialog pops up)

print "Fin"



From __peter__ at web.de  Mon May 11 12:28:54 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 11 May 2009 18:28:54 +0200
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
	<gu8u7s$l1$1@news.lysator.liu.se>
	<Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>
	<gu954t$29r$1@news.lysator.liu.se>
Message-ID: <gu9jo6$9bk$01$1@news.t-online.com>

Mikael Olofsson wrote:

> Duncan Booth wrote:
> 
>> The __get__ method should be returning a new object, NOT modifying the
>> state of the decorator. As written it will break badly and unexpectedly
>> in a variety of situations:
>> 
>> [snip good examples of things going bad]
> 
> Ouch! So, does that mean that George's solution based on a function is
> the way to go, or does that mean that my __call__ should analyze the
> passed callable?

I usually use decorator functions, but I think the following should work, 
too:

class deco(object):
    def __init__(self, func):
        self._func = func
    def __call__(self, *args):
        print "Decorator:", args
        self._func(*args)
    def __get__(self, *args):
        return deco(self._func.__get__(*args))

Peter



From james at agentultra.com  Mon May 11 12:29:25 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 11 May 2009 12:29:25 -0400
Subject: list comprehension question
References: <6d502cfd-e252-4722-96a5-c52fc3579499@v1g2000prd.googlegroups.com>
	<mailman.4883.1241139950.11746.python-list@python.org>
	<85ocucnbce.fsf@agentultra.com>
	<mailman.4923.1241193638.11746.python-list@python.org>
	<85ljpb8r1o.fsf@agentultra.com>
	<mailman.5109.1241543371.11746.python-list@python.org>
	<85d4am8hq4.fsf@agentultra.com>
	<pan.2009.05.07.01.35.11@REMOVE.THIS.cybersource.com.au>
	<8563gcx1p1.fsf@agentultra.com>
	<0214c407$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <85zldj38nu.fsf@agentultra.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

> On Thu, 07 May 2009 13:28:10 -0400, J Kenneth King wrote:
>
>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>> 
>>> On Wed, 06 May 2009 09:48:51 -0400, J Kenneth King wrote:
>>>
>>>> Emile van Sebille <emile at fenx.com> writes:
>>>> 
>>>>> On 5/5/2009 9:15 AM J Kenneth King said...
>>>>>
>>>>>> List comprehensions can make a reader of your code apprehensive
>>>>>> because it can read like a run-on sentence and thus be difficult to
>>>>>> parse. The Python documentation discourages their use and I believe
>>>>>> for good reason.
>>>>>
>>>>> Can you provide a link for this?  I'd like to see specifically what's
>>>>> being discouraged, as I'd be surprised to find routine usage frowned
>>>>> upon.
>>>>>
>>>>> Emile
>>>> 
>>>> http://docs.python.org/tutorial/datastructures.html#nested-list-
>>> comprehensions
>>>> 
>>>> 
>>>> "If you?ve got the stomach for it, list comprehensions can be nested.
>>>> They are a powerful tool but ? like all powerful tools ? they need to
>>>> be used carefully, if at all."
>>>
>>> How does this discourage the use of list comprehensions? At most, it
>>> warns that complicated list comps are tricky. Complicated *anything*
>>> are tricky.
>> 
>> They are tricky and need to be used carefully, *if at all*.
>> 
>> IMO this means that if there's a way to do it without a nested list
>> comprehension, then that solution should be preferred.
>
> Earlier, you claimed that list comps in general were discouraged:
>
> "List comprehensions can make a reader of your code apprehensive because 
> it can read like a run-on sentence and thus be difficult to parse. The 
> Python documentation discourages their use and I believe for good reason."

Ooops. Typo. My bad. Had it been quoted earlier it would have saved a
few posts for sure. Such is the Internet. :)

> Emile said "I'd be surprised to find routine usage frowned upon", giving 
> you the opportunity to correct his (mis)understanding. You failed to do 
> so, which I took as meaning that you agreed that routine usage of simple 
> list comps were frowned upon. Now you're talking about *nested* list 
> comps. You started off (apparently) objecting to list comps in general, 
> because they "can" make readers apprehensive. Now you seem to be saying 
> that it's only the complicated, overly-dense ones which rightly make 
> readers apprehensive which you object to.

I was rather confused by that. I use list comps all the time and said
several times that I don't object to list comps, just nested ones.

> I suppose we're making progress if we agree that the Python docs warn 
> against unnecessarily complicated nested list comps. Whether it 
> discourages as well as warns is a matter of interpretation. But there's 
> certainly no sign that list comps as a general technique are discouraged 
> just because overly-complicated list comps are tricky to read. The same 
> can be said about *any* piece of code.

Well I did my best to make my interpretation clear. If the
documentation says that nested list comps are difficult to read and
should be used rarely, if at all, then I generally consider that
"discouraging" their use. Meaning of course that in the right
situation one may be able to justify their own use of a nested comp.
However, for every day problems one wouldn't be encouraged to use them
so liberally as some tend to do.


So.. we have some sort of consensus then? This might be a rare
phenomenon on Usenet... :)

Cheers,

J.


From yahoo at al-got-rhythm.net  Mon May 11 12:30:03 2009
From: yahoo at al-got-rhythm.net (jalanb3)
Date: Mon, 11 May 2009 16:30:03 -0000
Subject: Can I get a value's name
Message-ID: <gu9jqb+q7rk@eGroups.com>

Context for this question arises from some recent code. In particular the "replace_line" method, which takes in a regexp to look for, and a replacement for when it matches.

It is supposed to work for single lines only (we add ^ and $ to the regexp), so arguments which have '\n' in them are not accepted.

So at start of the method we search for such bad chars, and the code ends up something like this:

def replace_line(pattern,replacement):
    errors = '\n' in pattern and [ 'pattern' ] or []
    errors += '\n' in replacement and [ 'replacement' ] or []
    values = [ locals()[e] for e in errors ]
    # etc, etc, and eventually:
    print 'Argument %s is bad : "%s"' % (errors[0],values[0])

And the question arises from that locals() line:
    Given a variable name I can use locals() to get the value
    Is there a way to do it the other way round
        Given the value, can I get the variable name ?

For example, suppose I had started like this (using the variables, not strings with their names)

def replace_line(pattern,replacement):
    values = '\n' in pattern and [ pattern ] or []
    values += '\n' in replacement and [ replacement ] or []

Can I later get the name "pattern" via values[0]?

If this was an array in another language:
    Of course not, values[0] is a copy of the value
        so the connection to the variable is lost
But, AFAIK, in Python values[0] is "just a rename" of pattern
    so there might be a way to get "through to" the original variable

Thank you for reading this far.
    If you were now to start writing, I'd be very grateful indeed.

-- 
Alan

P.S. This is just curiosity - replace_lines() works great as is.



From pje at telecommunity.com  Mon May 11 12:35:58 2009
From: pje at telecommunity.com (P.J. Eby)
Date: Mon, 11 May 2009 12:35:58 -0400
Subject: [Python-Dev] .pth files are evil
In-Reply-To: <4A059639.7040505@v.loewis.de>
References: <49D4DA72.60401@v.loewis.de>
	<20090407174355.B62983A4063@sparrow.telecommunity.com>
	<49E4A58F.70309@egenix.com>
	<20090414162603.70C843A4100@sparrow.telecommunity.com>
	<49E4F93B.6010802@egenix.com>
	<20090415003026.B0A783A4114@sparrow.telecommunity.com>
	<49E59202.6050809@egenix.com>
	<20090415144147.6845F3A4100@sparrow.telecommunity.com>
	<49E60832.8030806@egenix.com> <49FB22B5.3040507@simplistix.co.uk>
	<cd6401a0905090649g34bb3b74l9179a4fd5c8b3f75@mail.gmail.com>
	<4A0590C4.1020904@v.loewis.de>
	<20090509143829.17F293A4080@sparrow.telecommunity.com>
	<4A059639.7040505@v.loewis.de>
Message-ID: <20090511163321.984D53A4109@sparrow.telecommunity.com>

At 04:42 PM 5/9/2009 +0200, Martin v. L?wis wrote:
> >> If you always use --single-version-externally-managed with easy_install,
> >> it will stop editing .pth files on installation.
> >
> > It's --multi-version (-m) that does that.
> > --single-version-externally-managed is a "setup.py install" option.
> >
> > Both have the effect of not editing .pth files, but they do so in
> > different ways.  The "setup.py install" option causes it to install in a
> > distutils-compatible layout, whereas --multi-version simply drops .egg
> > files or directories in the target location and leaves it to the user
> > (or the generated script wrappers) to add them to sys.path.
>
>Ah, ok. Is there also an easy_install invocation that unpacks the zip
>file into some location of sys.path (which then wouldn't require
>editing sys.path)?

No; you'd have to use the -e option to easy_install to download and 
extract a source version of the package; then run that package's 
setup.py, e.g.:

    easy_install -eb /some/tmpdir SomeProject
    cd /some/tmpdir/someproject  # subdir is always lowercased/normalized
    setup.py install --single-version-externally-managed --record=...

I suspect that this is basically what pip is doing under the hood, as 
that would explain why it doesn't support .egg files.

I previously posted code to the distutils-sig that was an .egg 
unpacker with appropriate renaming, though.  It was untested, and 
assumes you already checked for collisions in the target directory, 
and that you're handling any uninstall manifest yourself.  It could 
probably be modified to take a filter function, though, something like:

def flatten_egg(egg_filename, extract_dir, filter=lambda s,d: d):
      eggbase = os.path.filename(egg_filename)+'-info'
      def file_filter(src, dst):
          if src.startswith('EGG-INFO/'):
              src = eggbase+s[8:]
              dst = os.path.join(extract_dir, *src.split('/'))
          return filter(src, dst)
      return unpack_archive(egg_filename, extract_dir, file_filter)

Then you could pass in a None-returning filter function to check and 
accumulate collisions and generate a manifest.  A second run with the 
default filter would do the unpacking.

(This function should work with either .egg files or .egg directories 
as input, btw, since unpack_archive treats a directory input as if it 
were an archive.)

Anyway, if you used "easy_install -mxd /some/tmpdir [specs]" to get 
your target eggs found/built, you could then run this flattening 
function (with appropriate filter functions) over the *.egg contents 
of /some/tmpdir to do the actual installation.

(The reason for using -mxd instead of -Zmaxd or -zmaxd is that we 
don't care whether the eggs are zipped or not, and we leave out the 
-a so that dependencies already present on sys.path aren't copied or 
re-downloaded to the target; only dependencies we don't already have 
will get dropped in /some/tmpdir.)

Of course, the devil of this is in the details; to handle conflicts 
and uninstalls properly you would need to know what namespace 
packages were in the eggs you are installing.  But if you don't care 
about blindly overwriting things (as the distutils does not), then 
it's actually pretty easy to make such an unpacker.

I mainly haven't made one myself because I *do* care about things 
being blindly overwritten.



From norseman at hughes.net  Mon May 11 12:51:48 2009
From: norseman at hughes.net (norseman)
Date: Mon, 11 May 2009 09:51:48 -0700
Subject: Wrapping comments
In-Reply-To: <towb-EA7906.14423909052009@news.individual.de>
References: <towb-EA7906.14423909052009@news.individual.de>
Message-ID: <4A0857A4.9090108@hughes.net>

Tobias Weber wrote:
> Hi,
> the guideline (PEP 8) is hard wrap to 7x characters. The reason given is 
> that soft wrap makes code illegible.
> 
> So what if you hard wrap code but let comments and docstrings soft-wrap?
> 
> Otherwise it's hugely annoying to edit them. Say you remove the first 
> three words of a 150 character sentence. Either keep the ugly or rewrap 
> manually.
> 
> Or are there editors that can do a "soft hard wrap" while keeping 
> indentation and #comment markers intact?
> 

=======================
Paragraph 1:  65 and 72 cols are US typewriter standard 12 and 10 pt
               respectively. (MSDOS screen, business standard paper, ..)
               And yes, soft wrap does. Check the hardcopy which wraps
               code with lots of long lines.

Paragraph 2:  Comments? I vote no. These are in the code and should
               conform to helping at that location.
               Doc_stuff - I vote yes. For the obvious reason that it
               makes formating the Docs easier AND is to be 'extracted'
               to a separate file for that purpose in the first place.

Paragraph 3:  True

Could you give a short example of what you are referring to in your last 
paragraph?  I showed this to several friends and got several 'views' as 
to what is intended.


I assume you are NOT intending to use third party programs to write code 
in but rather to use Python somehow?

I assume you are intending that the editor add the backslash newline at 
  appropriate places without causing a word or code break when needed 
and simply wrapping with indent without breaking the code the rest of 
the time and doing so in such a fashion that ALL general text editors 
will be able to display code properly as well as be usable in modifying 
code?
Not to mention that the interpreter and/or compiler will still be able 
to use the file.


Steve



From norseman at hughes.net  Mon May 11 13:06:28 2009
From: norseman at hughes.net (norseman)
Date: Mon, 11 May 2009 10:06:28 -0700
Subject: Complete frustration
In-Reply-To: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
Message-ID: <4A085B14.2060908@hughes.net>

hellcats wrote:
> I have Python2.5 installed on Windows XP. Whenever I double click on a
> something.pyw file, IDLE launches and opens something.pyw in the
> editor. I would prefer to actually *RUN* the program, not edit it. If
> I want to edit it then I'll choose the "Edit with IDLE" context menu.
> So I then have to press F5 to get the program to execute. Now I have
> my program's windows along with two IDLE windows cluttering my screen
> and task bar. WHAT IS GOING ON? I've tried changing the file
> association to python.exe, and that works, but just ONCE (even if I
> choose "always use the slected program to launch this kind of file").
> IDLE may be great and all, but I fricken' don't want to see it every
> time I just want to run a python program!!!!!
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
------------------------
I agree completely.  Check the Python-List archives. Look for a file 
that is dated July 8, 2008 (07/08/2008) that was sent by norseman.

It works for me.


Steve


From agaskins_ng at kelleramerica.com  Mon May 11 13:06:42 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Mon, 11 May 2009 13:06:42 -0400
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
	<74c79941-af9b-4b43-b02b-8316b108f08d@l28g2000vba.googlegroups.com>
	<EXXNl.12201$Ux.6636@tornado.fastwebnet.it>
Message-ID: <IWYNl.48506$bi7.46973@newsfe07.iad>

Any idea why I didn't see this reply on my ng? I only see the reply from 
Marco. Can't help but wonder if there is more that is not getting through 
here.

Would someone mind forwarding me any other replies?

FWIW I'm using news.east.cox.net.

Thanks,
-Adam

> Mike Driscoll wrote:
>
>> I've never used (or heard of) the Abstract type...and the guy who
>> wrote the FAQ was being a jerk.




From norseman at hughes.net  Mon May 11 13:16:19 2009
From: norseman at hughes.net (norseman)
Date: Mon, 11 May 2009 10:16:19 -0700
Subject: unicode bit me
In-Reply-To: <0214c5da$0$20647$c3e8da3@news.astraweb.com>
References: <e5e9dd74-7b5a-4937-81c4-69aa260731fe@b7g2000pre.googlegroups.com>	<0vadnQqkdrdQz5nXnZ2dnUVZ_uOdnZ2d@pdx.net>	<mailman.5308.1241806970.11746.python-list@python.org>
	<0214c5da$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <4A085D63.7000605@hughes.net>

Steven D'Aprano wrote:
> On Fri, 08 May 2009 14:22:32 -0400, Terry Reedy wrote:
> 
>> Scott David Daniels wrote:
>>
>>> <rant>It would be a bit easier if people would bother to mention their
>>> Python version, as we regularly get questions from people running 2.3,
>>> 2.4, 2.5, 2.6, 2.7a, 3.0, and 3.1b.  They run computers with differing
>>> operating systems and versions such as: Windows 2000, OS/X Leopard,
>>> ubuntu Hardy Heron, SuSE, ....
>> And if they copy and paste the actual error messages instead of saying
>> 'It doesn't work'
> 
> "I tried to copy and paste the actual error message, but it doesn't 
> work..."
> 
> 
> *grin*
> 
> 
==========================
In Linux get/use gpm and copy paste is simple.
In Microsoft see:  Python-List file dated  May 6, 2009 (05/06/2009) sent 
by norseman.


From Scott.Daniels at Acm.Org  Mon May 11 13:18:18 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 11 May 2009 10:18:18 -0700
Subject: Can I get a value's name
In-Reply-To: <mailman.0.1242059758.12689.python-list@python.org>
References: <mailman.0.1242059758.12689.python-list@python.org>
Message-ID: <HbmdnYRzSuo9wZXXnZ2dnUVZ_v2dnZ2d@pdx.net>

jalanb3 wrote:
> ... Given a variable name I can use locals() to get the value
>     Is there a way to do it the other way round
>         Given the value, can I get the variable name ?

(1) Yes you can in some cases.
(2) You should not, things do not inherently have a name.

With that prelude:
     def find_names(value, dictionary):
         for name, val in dictionary.items():
             if val is value: # note: "is", not "=="
                 yield name

     x = 123456
     y = 123456 * 3 // 3
     z = 123456.0
     q = y
     print list(find_names(y, locals()))

--Scott David Daniels
Scott.Daniels at Acm.Org


From chambon.pascal at wanadoo.fr  Mon May 11 13:59:12 2009
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Mon, 11 May 2009 19:59:12 +0200
Subject: stand alone exec
In-Reply-To: <805f59d50905102006obd4e42bo6b8923b62f84f6d6@mail.gmail.com>
References: <805f59d50905102006obd4e42bo6b8923b62f84f6d6@mail.gmail.com>
Message-ID: <4A086770.6060607@wanadoo.fr>

Hello

It sounds indeed like a runtime library problem...

You should run a dependancy finder (like dependency walker - 
http://www.dependencywalker.com/) on your executable, and thus see what 
might be lacking on other systems.
I know that on *nix systems there are tools to see more precisely what's 
missing, but on windows, exept that tool I don't know much.

Regards,
Pascal



prakash jp a ?crit :
> Hi all,
>  
> I want to run dos commands through python stand alone execs. The 
> created Python stand alone executable (py2exe)  works fine
>  
> in my machine but on transferring the "dist" folder to other systems 
> the executable fails to run.
>  
> I tried to copy the MSVCP90.dll in the "dist" folder. Also tried to 
> exclude the same dll in the options of the setup.py file
>  
> The error reads as follows :
>  
> "The application has failed to start because the application 
> configuration is incorrect. Reinstalling the application may fix this 
> problem".
>  
> Details of the installed setup files may be useful :
>  
> 1- python-2.6.1.msi
> 2- py2exe-0.6.9.win32-py2.6.exe
> 3- pywin32-212.win32-py2.6.exe
>  
> Thanks in advance
>  
> Regards
> Prakash
> ------------------------------------------------------------------------
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>   

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From tim.arnold at sas.com  Mon May 11 14:04:30 2009
From: tim.arnold at sas.com (Tim Arnold)
Date: Mon, 11 May 2009 14:04:30 -0400
Subject: piping input to an external script
Message-ID: <gu9pbe$csc$1@foggy.unx.sas.com>

Hi, I have some html files that I want to validate by using an external 
script 'validate'. The html files need a doctype header attached before 
validation. The files are in utf8 encoding. My code:
---------------
import os,sys
import codecs,subprocess
HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'

filename  = 'mytest.html'
fd = codecs.open(filename,'rb',encoding='utf8')
s = HEADER + fd.read()
fd.close()

p = subprocess.Popen(['validate'],
                    stdin=subprocess.PIPE,
                    stdout=subprocess.PIPE,
                    stderr=subprocess.STDOUT)
validate = p.communicate(unicode(s,encoding='utf8'))
print validate
---------------

I get lots of lines like this:
Error at line 1, character 66:\tillegal character number 0
etc etc.

But I can give the command in a terminal 'cat mytest.html | validate' and 
get reasonable output. My subprocess code must be wrong, but I could use 
some help to see what the problem is.

python2.5.1, freebsd6
thanks,
--Tim




From gert.cuykens at gmail.com  Mon May 11 14:08:03 2009
From: gert.cuykens at gmail.com (gert)
Date: Mon, 11 May 2009 11:08:03 -0700 (PDT)
Subject: sqlite single transaction without foreign key or triggers
Message-ID: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>

I am trying to do this in a single transaction, the 3 separate
statements work fine, but i am screwed if they are not executed
together.

 ########### db.execute('BEGIN') #############
 db.execute('UPDATE users SET uid=? WHERE uid=?',(v['uid'],s.UID))
 db.execute('UPDATE sessions SET uid=? WHERE sid=?',(v['uid'],s.SID))
 # only do this if there is no primary key conflict in the above
 if db.ERROR == None: db.execute('UPDATE groups SET uid=? WHERE uid=?',
(v['uid'],s.UID))
 ########### db.execute('END') #####################

My tables are as follows

CREATE TABLE users (
    uid     VARCHAR(64) PRIMARY KEY,
    name    VARCHAR(64) DEFAULT '',
    adress  VARCHAR(64) DEFAULT '',
    city    VARCHAR(64) DEFAULT '',
    country VARCHAR(64) DEFAULT '',
    phone   VARCHAR(64) DEFAULT '',
    picture BLOB
);

CREATE TABLE groups (
    gid     VARCHAR(64),
    uid     VARCHAR(64),
    PRIMARY KEY(gid,uid),
    FOREIGN KEY(uid) REFERENCES users(uid) ON UPDATE CASCADE ON DELETE
CASCADE
);

CREATE TABLE sessions (
    uid     VARCHAR(64) UNIQUE,
    pwd     VARCHAR(64) DEFAULT '',
    sid     VARCHAR(64) PRIMARY KEY,
    exp     DATETIME,
    FOREIGN KEY(uid) REFERENCES users(uid) ON UPDATE CASCADE ON DELETE
CASCADE
);

What is the python or sql way of doing this kind of things ?




From samwyse at gmail.com  Mon May 11 14:16:14 2009
From: samwyse at gmail.com (samwyse)
Date: Mon, 11 May 2009 11:16:14 -0700 (PDT)
Subject: creating classes with mix-ins
Message-ID: <d6409bb3-f2ed-4964-942a-b0698060a7f0@e24g2000vbe.googlegroups.com>

I'm writing a class that derives it's functionality from mix-ins.
Here's the code:

    def boilerplate(what):   # This used to be a decorator, but all of
the
        ##what = f.__name__  # function bodies turned out to be
'pass'.
        'Validate the user, then call the appropriate plug-in.'
        def template(self, which, username, password, *args):
            if not self.security.isAuthorised(username, password,
which, what):
                raise Exception('Unauthorised access')
            return getattr(self.blog, what)(which, *args)
        template.__name__ = what
        template.__doc__ = getattr(self.blog, what).__doc__
        return template

    class MetaWeblog(object):
        def __init__(self,
                     securityHandler=SimpleSecurityHandler,
                     blogHandler=SimpleBlogHandler):
            self.security = securityHandler()
            self.blog = blogHandler()
        newPost = boilerplate('newPost')
        editPost = boilerplate('editPost')
        getPost = boilerplate('getPost')
        # etc, etc, etc

I'd like to replace the method definitions with a loop:
        for what in attr_list:
            setattr(klass, what, boilerplate(what))

That begs the question of where I define 'klass' and 'attr_list'.
Should I use a class decorator, or a metaclass?  In favor of
decorators is that I can see how to do it; in favor of a metaclass is
that I get to learn how to use them.  ;-)  What are the other pros and
cons for each choice?


From research at johnohagan.com  Mon May 11 14:21:58 2009
From: research at johnohagan.com (John O'Hagan)
Date: Mon, 11 May 2009 18:21:58 +0000
Subject: Can I get a value's name
In-Reply-To: <gu9jqb+q7rk@eGroups.com>
References: <gu9jqb+q7rk@eGroups.com>
Message-ID: <200905111821.59253.research@johnohagan.com>

On Mon, 11 May 2009, jalanb3 wrote:

[...]

>
> def replace_line(pattern,replacement):
>     errors = '\n' in pattern and [ 'pattern' ] or []
>     errors += '\n' in replacement and [ 'replacement' ] or []
>     values = [ locals()[e] for e in errors ]
>     # etc, etc, and eventually:
>     print 'Argument %s is bad : "%s"' % (errors[0],values[0])
>
> And the question arises from that locals() line:
>     Given a variable name I can use locals() to get the value
>     Is there a way to do it the other way round
>         Given the value, can I get the variable name ?
>
> For example, suppose I had started like this (using the variables, not
> strings with their names)
>
> def replace_line(pattern,replacement):
>     values = '\n' in pattern and [ pattern ] or []
>     values += '\n' in replacement and [ replacement ] or []
>
> Can I later get the name "pattern" via values[0]?
>
[...]

def replace_line(pattern,replacement):
    values = '\n' in pattern and [ pattern ] or []
    values += '\n' in replacement and [replacement] or []
    loc=locals()
    print [i for i in loc if loc[i] is pattern if pattern in values]

will print ['pattern'] if the value of pattern is in values (if there's a 
newline in pattern). Is that what you're after?

HTH,

John


From arnodel at googlemail.com  Mon May 11 14:25:15 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 11 May 2009 19:25:15 +0100
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
	<mailman.5386.1241975816.11746.python-list@python.org>
	<towb-E11980.22281210052009@news.individual.de>
Message-ID: <m27i0no5tg.fsf@googlemail.com>

Tobias Weber <towb at gmx.net> writes:

> In article <mailman.5386.1241975816.11746.python-list at python.org>,
>  David Robinow <drobinow at gmail.com> wrote:
>
>> (define-key key-translation-map [?\M-3] "#")
>> 
>> 
>> or, if you prefer, just be sick.
>
> Thanks, but I don't believe using releases from people who think I jump 
> should through hoops just to make my keyboard work is a good plan for a 
> relaxed future. According to their release notes this was (once) fixed 
> years ago.

No need for editing .emacs.

Click 'Options' on the menu bar, hover down to the 'Option Key >' item,
then select the 'Meta & British' option.  This is IMHO the best option
(if you have a UK keyboard, of course!).  This way, Alt-3 gives you a
'#'.

It would be a shame to abandon Aquamacs just for this, they have made a
lot of efforts to make it integrate well with OSX and I think this is
one of the few hurdles that are left.

-- 
Arnaud


From nick at craig-wood.com  Mon May 11 14:30:04 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 11 May 2009 13:30:04 -0500
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
Message-ID: <slrnh0grfa.8na.nick@irishsea.home.craig-wood.com>

Adam Gaskins <agaskins_ng at kelleramerica.com> wrote:
>  I am a fairly seasoned PHP developer (don't shoot, I'm changing teams!:) who 
>  is admittedly behind the curve with OOP. Like most who learned PHP, I 
>  started doing web app backend stuff, but I have moved to full blown windows 
>  apps in the last 6 months using Winbinder. As you may know Winbinder is 
>  essentially abandoned, and programming windows apps with Winbinder or even 
>  GTK-PHP is less than ideal. I also deal heavily in serial/rs-232 
>  communications which is a pain in PHP. Long story short, I'm tired of doing 
>  things in such a hackish manner and want to write applications that are 
>  cross platform (I'd like to get our production dept on linux eventually) and 
>  truely object oriented.
> 
>  So I was beginning to learn OOP for PHP, and it seemed to me that abstract 
>  classes were just right for my application. In my application I must 
>  communicate with several peices of test equipment that communicate via 
>  RS-232. Most use SCPI instructions, some do not and require low level 
>  communication.
> 
>  The way I understand abstract classes is that I could have a class that has 
>  all my abstract methods such as 'init', 'getMeasurement', 'setPressure', 
>  etc... then I could use this common interface to to control my different 
>  pieces of hardware (after I write a library for each of them).
> 
>  Is this a valid application for abstract classes? Or am I making life more 
>  complicated than it need be?

This sounds like a fine use for Abstract classes.

Python doesn't have language support for them directly, but they are
usually written like this

    class DeviceBase(object):
        def __init__(self):
            raise NotImplementedError()
        def getMeasusrement(self):
            raise NotImplementedError()
        def setPressure(self, pressure):
            raise NotImplementedError()

Then subclass it for the real functionality

    class RealDevice(DeviceBase):
        def __init__(self):
            self.pressure = 0
        def getMeasusrement(self):
            return 0
        def setPressure(self, pressure):
            self.pressure = pressure

However, I normally found that there is some functionality that is
common to all subclasses so there may be some real methods in your
DeviceBase class, eg

class DeviceBase(object):
    def __init__(self, device):
        self.device = device
    def getMeasurement(self):
        raise NotImplementedError()
    def setPressure(self, pressure):
        raise NotImplementedError()
    def __repr__(self):
        return "%s(%r)" % (self.__class__.__name__, self.device)

class RealDevice(DeviceBase):
    def __init__(self, device):
        DeviceBase.__init__(self, device)
        self.pressure = 0
    def getMeasurement(self):
        return self.pressure
    def setPressure(self, pressure):
        self.pressure = pressure

Which looks like this when you test it

>>> base = DeviceBase("/dev/ttyS0")
>>> base
DeviceBase('/dev/ttyS0')
>>> base.getMeasurement()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 5, in getMeasurement
NotImplementedError
>>> base.setPressure(14)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 7, in setPressure
NotImplementedError
>>>
>>> real = RealDevice("/dev/ttyS1")
>>> real
RealDevice('/dev/ttyS1')
>>> real.getMeasurement()
0
>>> real.setPressure(14)
>>> real.getMeasurement()
14
>>> 

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From google at mrabarnett.plus.com  Mon May 11 14:38:03 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 11 May 2009 19:38:03 +0100
Subject: Wrapping comments
In-Reply-To: <4A0857A4.9090108@hughes.net>
References: <towb-EA7906.14423909052009@news.individual.de>
	<4A0857A4.9090108@hughes.net>
Message-ID: <4A08708B.7000002@mrabarnett.plus.com>

norseman wrote:
> Tobias Weber wrote:
>> Hi,
>> the guideline (PEP 8) is hard wrap to 7x characters. The reason given 
>> is that soft wrap makes code illegible.
>>
>> So what if you hard wrap code but let comments and docstrings soft-wrap?
>>
>> Otherwise it's hugely annoying to edit them. Say you remove the first 
>> three words of a 150 character sentence. Either keep the ugly or 
>> rewrap manually.
>>
>> Or are there editors that can do a "soft hard wrap" while keeping 
>> indentation and #comment markers intact?
>>
> 
> =======================
> Paragraph 1:  65 and 72 cols are US typewriter standard 12 and 10 pt
>               respectively. (MSDOS screen, business standard paper, ..)
>               And yes, soft wrap does. Check the hardcopy which wraps
>               code with lots of long lines.
> 
> Paragraph 2:  Comments? I vote no. These are in the code and should
>               conform to helping at that location.
>               Doc_stuff - I vote yes. For the obvious reason that it
>               makes formating the Docs easier AND is to be 'extracted'
>               to a separate file for that purpose in the first place.
> 
> Paragraph 3:  True
> 
> Could you give a short example of what you are referring to in your last 
> paragraph?  I showed this to several friends and got several 'views' as 
> to what is intended.
> 
I think he means something like:

# 65 and 72 cols are US typewriter standard 12 and 10 pt respectively.

when wrapped to 40 gives:

# 65 and 72 cols are US typewriter
# standard 12 and 10 pt respectively.

and when rewrapped to 60 gives:

# 65 and 72 cols are US typewriter standard 12 and 10 pt
# respectively.

Indentation of lines wouldn't be affected, so:

         # 65 and 72 cols are US typewriter standard 12 and 10 pt 
respectively.

when wrapped to 40 gives:

         # 65 and 72 cols are US
         # typewriter standard 12 and 10
         # pt respectively.

and when rewrapped to 60 gives:

         # 65 and 72 cols are US typewriter standard 12 and
         # 10 pt respectively.

> 
> I assume you are NOT intending to use third party programs to write code 
> in but rather to use Python somehow?
> 
> I assume you are intending that the editor add the backslash newline at 
>  appropriate places without causing a word or code break when needed and 
> simply wrapping with indent without breaking the code the rest of the 
> time and doing so in such a fashion that ALL general text editors will 
> be able to display code properly as well as be usable in modifying code?
> Not to mention that the interpreter and/or compiler will still be able 
> to use the file.
> 


From __peter__ at web.de  Mon May 11 14:59:41 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 11 May 2009 20:59:41 +0200
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
Message-ID: <gu9sit$nd4$02$1@news.t-online.com>

Adam Gaskins wrote:

> So I was beginning to learn OOP for PHP, and it seemed to me that abstract
> classes were just right for my application. In my application I must
> communicate with several peices of test equipment that communicate via
> RS-232. Most use SCPI instructions, some do not and require low level
> communication.
> 
> The way I understand abstract classes is that I could have a class that
> has all my abstract methods such as 'init', 'getMeasurement',
> 'setPressure', etc... then I could use this common interface to to control
> my different pieces of hardware (after I write a library for each of
> them).
> 
> Is this a valid application for abstract classes? Or am I making life more
> complicated than it need be?
> 
> Now, I have read that Pythons OOP implimentation is so much better and
> more complete then PHP's, but I cant find anything about abstract classes
> except this:
> http://norvig.com/python-iaq.html
> 
> ...which says it doesn't exist in Python and you can only do this hack to
> make it work (and I don't particularly understand how to impliment it from
> this article).

It is basically a non-implementaton. If you don't understand it you should 
not mess with abstract base classes and work your way through an 
introductory python textbook. 

That said, the page is outdated; Python 2.6 has some support for abstract 
classes. They even fail a bit earlier, when the class is instantiated 
instead of when the method is called. Example:

from abc import ABCMeta, abstractmethod, abstractproperty

class AbstractDevice:
    __metaclass__ = ABCMeta

    @abstractmethod
    def init(self):
        pass

    @abstractproperty
    def pressure(self):
        pass


class Compressor(AbstractDevice):
    def init(self):
        print "starting compressor"

    def set_pressure(self, value):
        print "setting pressure to", value
    pressure = property(fset=set_pressure)

c = Compressor()
c.init()
c.pressure = 42

a = AbstractDevice() # fails with TypeError

 
> This makes me suspect I am making things more comlicated than they need to
> be. Could someone help me understand the proper way to impliment a set
> classes/methods to deal with several peices of similar and not so similar
> hardware? Not looking for anyone to write code for me, just help
> understanding some of these OOP concepts and how they would apply to my
> situation.

Personally I would just write the class I need

class Compressor(object):
    def init(self):
        print "starting compressor"

    def set_pressure(self, value):
        print "setting pressure to", value
    pressure = property(fset=set_pressure)

and forget about the bureaucracy. Instead I recommend that you learn about 
unit tests and write a few tests to ensure your classes work as specified.

Peter



From ken at seehart.com  Mon May 11 15:11:22 2009
From: ken at seehart.com (Ken Seehart)
Date: Mon, 11 May 2009 12:11:22 -0700
Subject: Can I get a value's name
In-Reply-To: <gu9jqb+q7rk@eGroups.com>
References: <gu9jqb+q7rk@eGroups.com>
Message-ID: <4A08785A.6070906@seehart.com>

jalanb3 wrote:
> Context for this question arises from some recent code. In particular the "replace_line" method, which takes in a regexp to look for, and a replacement for when it matches.
>
> It is supposed to work for single lines only (we add ^ and $ to the regexp), so arguments which have '\n' in them are not accepted.
>
> So at start of the method we search for such bad chars, and the code ends up something like this:
>
> def replace_line(pattern,replacement):
>     errors = '\n' in pattern and [ 'pattern' ] or []
>     errors += '\n' in replacement and [ 'replacement' ] or []
>     values = [ locals()[e] for e in errors ]
>     # etc, etc, and eventually:
>     print 'Argument %s is bad : "%s"' % (errors[0],values[0])
>
> And the question arises from that locals() line:
>     Given a variable name I can use locals() to get the value
>     Is there a way to do it the other way round
>         Given the value, can I get the variable name ?
>
> For example, suppose I had started like this (using the variables, not strings with their names)
>
> def replace_line(pattern,replacement):
>     values = '\n' in pattern and [ pattern ] or []
>     values += '\n' in replacement and [ replacement ] or []
>
> Can I later get the name "pattern" via values[0]?
>
> If this was an array in another language:
>     Of course not, values[0] is a copy of the value
>         so the connection to the variable is lost
> But, AFAIK, in Python values[0] is "just a rename" of pattern
>     so there might be a way to get "through to" the original variable
>   
No, values[0] gives a reference to the value stored at index 0 of the 
values array, which does not contain the name.
In particular, the name and all other information about the expression 
itself is lost.  A value generally does not contain the
"pattern" or any kind of name information (although class, method, and 
function instances contain some symbolic information in them).

Study the concept of 'references' and all of this will become more clear.

The only way to do something like what you want would be to search 
globals() or locals() for the value (depending on the context), but that 
would be an extremely ugly hack.  Chances are that if you want to do 
this, you need to rethink the problem instead.

# horribly bad, but sort of working, code follows:

foo = 'find me!'

def find_var(x):
    '''returns the name associated with a value'''
    for k,v in globals().items():
        if v == x:
            return k

print find_var(foo)

Note that a value can have several different names (and unnamed 
references) pointing at it, so the above code is not very general, but 
it may illustrate some interesting points.

My guess is that your entire approach may need rethinking.  What is the 
ultimate objective of your project?
> Thank you for reading this far.
>     If you were now to start writing, I'd be very grateful indeed.
>
>   



From simon at brunningonline.net  Mon May 11 15:23:08 2009
From: simon at brunningonline.net (Simon Brunning)
Date: Mon, 11 May 2009 20:23:08 +0100
Subject: Wrapping comments
In-Reply-To: <towb-63CE3D.09322210052009@news.individual.de>
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
Message-ID: <8c7f10c60905111223k34ef1130n21acc0cc39206fc5@mail.gmail.com>

2009/5/10 Tobias Weber <towb at gmx.net>:
> (still not gonna use software that doesn't let me type # because it's
> alt+3 on a UK layout; having to re-learn or configure that is just sick)

To use Aquamacs with a UK keyboard, you want to select Options, Option
Key, Meta & British. Things just work then.

-- 
Cheers,
Simon B.


From cripplemeal at gmail.com  Mon May 11 15:54:21 2009
From: cripplemeal at gmail.com (cripplemeal at gmail.com)
Date: Mon, 11 May 2009 12:54:21 -0700 (PDT)
Subject: Using Pygame with Python
Message-ID: <e7f4b94c-5e3a-4f2d-80e1-3227b86f14f0@q2g2000vbr.googlegroups.com>

Hi. I would just like to know which of the versions of python and
pygame would be best to download for use together. I am a windows xp
user.


From kyosohma at gmail.com  Mon May 11 16:02:58 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 11 May 2009 13:02:58 -0700 (PDT)
Subject: Writing text to a Word Document
References: <8ba265c9-4697-41b4-a117-04761a86a945@g20g2000vba.googlegroups.com>
Message-ID: <33867bab-9237-4a60-be14-46647522edd9@l28g2000vba.googlegroups.com>

On May 11, 11:27?am, gazath... at gmail.com wrote:
> Hi everyone,
>
> I am trying to write several attributes from a database table and
> using the code below I can write the values however it is only
> overwriting on the first line.
>
> I am new to the win32com bit and I would like to know what is the
> recommended reference to loop down the page and add multiple records
> rather than the worddoc.Content.
>
> I have read a little about writing this to an RTF or htmol but I am
> getting information overload and going nowhere. ?Does anyone have a
> nice tutorial out there that simply explains how to do this?
>
> Much appreciated for any thoughts.
>
> Cheers,
>
> Gareth
>
> import win32com.client, arcgisscripting, sys, os
> gp = arcgisscripting.create(9.3)
>
> #Create word document component -http://www.faqts.com/knowledge_base/view.phtml/aid/37034/fid/244
> wordapp = win32com.client.Dispatch("Word.Application") # Create new
> Word Object
> wordapp.Visible = 1 # Word Application should`t be visible
> worddoc = wordapp.Documents.Add() # Create new Document Object
> worddoc.Content.Font.Size = 11
> worddoc.Content.Paragraphs.TabStops.Add (100)
>
> #Setup of GDB Connection
> # Get the Featureclass from the Mobel - Property Box
> PropBox = "C:\\Avon Fire Rescue\\data\AvonFire_1.gdb\\PropertyBox"
>
> # Make a search cursor for the Property Box Feature class
> PBselCur = gp.searchcursor(PropBox)
> PBrow = PBselCur.reset()
> PBrow = PBselCur.next()
>
> #Using the search cursor get the Premise ID from a Property box
>
> while PBrow:
> ? ? PBrowVal = PBrow.getvalue("PremisesID")
> ? ? #Add data to Word Document
> ? ? worddoc.Content.Text = (PBrowVal)
> ? ? PBrow = PBselCur.next()
>
> #worddoc.Close() # Close the Word Document (a save-Dialog pops up)
>
> print "Fin"

What you probably want is something like this:

rng = worddoc.Range(0,0)
while PBrow:
    rng.InsertAfter(PBrowVal + "\r\n")  # needs return and new line
character

At least, that's what I found in one of my books. It seemed to work
when I tested it in the interpreter.

Mike


From kyosohma at gmail.com  Mon May 11 16:06:49 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 11 May 2009 13:06:49 -0700 (PDT)
Subject: Using Pygame with Python
References: <e7f4b94c-5e3a-4f2d-80e1-3227b86f14f0@q2g2000vbr.googlegroups.com>
Message-ID: <3efb2b2f-60ba-4d70-80de-7f032909cc3c@s28g2000vbp.googlegroups.com>

On May 11, 2:54?pm, cripplem... at gmail.com wrote:
> Hi. I would just like to know which of the versions of python and
> pygame would be best to download for use together. I am a windows xp
> user.

Look at the pygame website to see what the newest version of Python it
supports and go with that unless there are known issues listed. If you
plan to make an executable of the game, then I recommend Python 2.5
since there are some known issues with 2.6 (don't know if that's true
for 3.0 or not, but it's probable).

- Mike


From baudewijn.vermeire at skynet.be  Mon May 11 16:09:15 2009
From: baudewijn.vermeire at skynet.be (bav)
Date: Mon, 11 May 2009 22:09:15 +0200
Subject: how to consume .NET webservice
Message-ID: <4a0885e2$0$2853$ba620e4c@news.skynet.be>

question from a python newbie;

  how can i consume in python language, a .NET web service, passing
  a string array as parameter in some easy steps?

best regards 




From ggardiner at iee.org  Mon May 11 16:19:02 2009
From: ggardiner at iee.org (Geoff Gardiner)
Date: Mon, 11 May 2009 21:19:02 +0100
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
In-Reply-To: <gu9fr2$je5$1@panix3.panix.com>
References: <mailman.5282.1241783298.11746.python-list@python.org>	<gu6i38$jhk$1@panix3.panix.com>	<mailman.5375.1241962005.11746.python-list@python.org>
	<gu9fr2$je5$1@panix3.panix.com>
Message-ID: <4A088836.3080006@iee.org>

Aahz wrote:
> ... That seems to demonstrate that regrtest.py is indeed a good mechanism for
> finding out whether it's a b0rked install!
>   

I agree that regrtest.py looks a good mechanism. It just appears that
`apt-get install python` on Debian and Ubuntu brings no tests with it.

@Lawrence D'Oliveiro:

`apt-get install debsums` does indeed show that the packages that it checks have matching checksums. `debsums [-a] python` checks all sorts of /usr/share/doc/python files while `debsums [-a] python2.5` checks /usr/share/doc/python2.5, /usr/lib/python2.5 and others as well. Although that wasn't what I was originally looking for it has been helpful.

Thank you for your suggestions.

All the best,
Geoff




From namekuseijin at gmail.com  Mon May 11 16:25:03 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Mon, 11 May 2009 17:25:03 -0300
Subject: how to consume .NET webservice
In-Reply-To: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
Message-ID: <gua1j0$tra$1@adenine.netfront.net>

bav escreveu:
> question from a python newbie;
> 
>   how can i consume in python language, a .NET web service, passing
>   a string array as parameter in some easy steps?

Unless Microsoft extended the standard in any way, then it should be 
just as you consume any web service, I guess. ;)

-- 
a game sig: http://tinyurl.com/d3rxz9


From kyosohma at gmail.com  Mon May 11 16:29:16 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 11 May 2009 13:29:16 -0700 (PDT)
Subject: how to consume .NET webservice
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
Message-ID: <a52fe4d1-3d04-4f20-ad14-b6e91a142c7e@g19g2000vbi.googlegroups.com>

On May 11, 3:09?pm, "bav" <baudewijn.verme... at skynet.be> wrote:
> question from a python newbie;
>
> ? how can i consume in python language, a .NET web service, passing
> ? a string array as parameter in some easy steps?
>
> best regards

You're being pretty vague here. Try using Google first...I got plenty
of hits with "python .net web service". This one sounds good:

http://www.beardygeek.com/2009/01/how-to-call-a-net-webservice-using-python/

It sounds like you consume it much like you do with other web
services...find the API and use Python to access it or create a parser
of some sort.

Mike


From agaskins_ng at kelleramerica.com  Mon May 11 16:34:02 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Mon, 11 May 2009 16:34:02 -0400
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
	<slrnh0grfa.8na.nick@irishsea.home.craig-wood.com>
Message-ID: <bZ%Nl.55092$ew.38769@newsfe24.iad>

Wow, thanks Nick! This is just what I was looking for!

Thanks to Peter as well. And as for your suggestion that I probably 
shouldn't mess with things I don't understand and learn the basics first... 
well, that is probably sound advice, but I figured out years ago that I 
learn things best by a) getting in over my head b) panicking a little c) 
sorting it all out, and fianlly d) (in the case of programming) refactoring 
to make it all proper later. It may be bss aackwards but it works for me :-)

I am going to work through these examples in the morning, thanks again guys! 




From tadwelessar at gmail.com  Mon May 11 16:39:26 2009
From: tadwelessar at gmail.com (Matteo)
Date: Mon, 11 May 2009 13:39:26 -0700 (PDT)
Subject: Fill Javascript form
Message-ID: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>

Hi everybody,
I have to fill a web form to authenticate and connect to the internet.
I thought it would have been easy to make a script to do that
automatically
on startup.

Unfortunately, it turned out that the form is written in JavaScript,
and
urllib2 therefore fails to even fetch the form.

The form itself is very simple, just name and password fields and a
"submit"
button.

Do you know of any workaround?


From rogeeff at gmail.com  Mon May 11 16:39:41 2009
From: rogeeff at gmail.com (rogeeff at gmail.com)
Date: Mon, 11 May 2009 13:39:41 -0700 (PDT)
Subject: How to replace constructor with factory method
Message-ID: <630cbc45-9809-45c8-addd-c229cd2d07d9@e23g2000vbe.googlegroups.com>

Hi,

Just wonder if it's possible in Python.

what I want is to tweak an existing Python class A with no
constructor, so that A() results in fuctory method call?

so o = A() instead being equivalent to:

s = object()
A.__init__(s)
o = s

becomes:

o = my_factory_function( A )

Thanks,

Gennadiy


From gabriel at opensuse.org  Mon May 11 16:40:57 2009
From: gabriel at opensuse.org (Gabriel)
Date: Mon, 11 May 2009 17:40:57 -0300
Subject: issue with twisted and reactor. Can't stop reactor
Message-ID: <1adde6890905111340o7ca2b19er762a76518eac9d05@mail.gmail.com>

Hello all!,

I'm trying to implement a simple one way communication using twisted.

Sender:
> send message
> close connection

Receiver:
> receive
> do something
> wait for other message

I'm testing with this simple examples:
Sender:
[code]
class SenderClient(protocol.Protocol):

    def __init__(self, data):
        self.data = data

    def connectionMade(self):
        self.transport.write(self.data)

    def dataReceived(self, data):
        self.transport.loseConnection()

    def connectionLost(self, reason):
        pass

class SenderFactory(protocol.ClientFactory):

    def __init__(self, data):
        self.data = data

    def buildProtocol(self, addr):
        return SenderClient(self.data)

    def clientConnectionFailed(self, connector, reason):
        logger.error("Connection failed. Reason %s" % reason)
        reactor.stop()

    def clientConnectionLost(self, connector, reason):
        reactor.stop()

class Sender(object):

    def __init__(self, host='localhost', port=61610):
        self.host = host
        self.port = port

    def send(self, data):
        reactor.connectTCP(self.host, self.port, SenderFactory(data))
        reactor.run()
[/code]

Receiver:
[code]
from twisted.internet import reactor, protocol

class Receiver(protocol.Protocol):

    def dataReceived(self, data):
        self.transport.write("success")
        print data

def main():
    factory = protocol.ServerFactory()
    factory.protocol = Receiver
    reactor.listenTCP(61610,factory)
    reactor.run()

if __name__ == '__main__':
    main()
[/code]

When I call send the first time it works fine, when I call send a
second time the sender hangs.
If I hit ctrl+c it throws:

[quote]
.../twisted/internet/base.py", line 527, in stop
    "Can't stop reactor that isn't running.")
twisted.internet.error.ReactorNotRunning: Can't stop reactor that isn't running.
[/quote]

Any idea why this is happening?
King regards.


From sam at tregar.com  Mon May 11 16:44:08 2009
From: sam at tregar.com (Sam Tregar)
Date: Mon, 11 May 2009 16:44:08 -0400
Subject: Your Favorite Python Book
Message-ID: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>

Greetings.  I'm working on learning Python and I'm looking for good books to
read.  I'm almost done with Dive into Python and I liked it a lot. I found
Programming Python a little dry the last time I looked at it, but I'm more
motivated now so I might return to it.  What's your favorite?  Why?

-sam
-------------- next part --------------
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From Shawn at Milochik.com  Mon May 11 17:00:21 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Mon, 11 May 2009 17:00:21 -0400
Subject: Your Favorite Python Book
In-Reply-To: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
Message-ID: <2dc0c81b0905111400k4b3876cdj80f500d30ff8660d@mail.gmail.com>

It depends on what you want to do. If you still want to beef up on
general knowledge, maybe skim through "The Python Cookbook" or
something reference-like.

If you feel ready to start doing something with Python, look into one
of the recent titles that applies Python for a specific purpose.
Examples:

"Gray Hat Python" (debugging, reverse engineering)
"Natural Language Processing with Python" (pre-order at this time)
Any up-to-date (version 1.0 and up) Django book (if you're into Web development)
"Expert Python Programming" (best practices)
"Beginning Python Visualization" (presenting data visually)
"Programming Collective Intelligence" (extracting valuable information
from public data sources, and more)

Shawn


From Shawn at Milochik.com  Mon May 11 17:06:52 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Mon, 11 May 2009 17:06:52 -0400
Subject: Fill Javascript form
In-Reply-To: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>
References: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>
Message-ID: <2dc0c81b0905111406u6be0bb11nc5a0cb239dce909e@mail.gmail.com>

How is the form "written in JavaScript"? Is it dynamically generated?

In any case, can you just send a POST request if you know the values required?


From rtw at freenet.co.uk  Mon May 11 17:07:42 2009
From: rtw at freenet.co.uk (Rob Williscroft)
Date: Mon, 11 May 2009 16:07:42 -0500
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
Message-ID: <Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>

gert wrote in news:d7591495-4661-4243-ad7e-f142d8244e88
@e24g2000vbe.googlegroups.com in comp.lang.python:

> I am trying to do this in a single transaction, the 3 separate
> statements work fine, but i am screwed if they are not executed
> together.

Well you're in luck, Python DBAPI 2 connections handle this 
for you, you do need to call commit() on the connection though.

The default, for DBAPI 2 connections, is that all "work" occurs in a 
transaction (if the DB actually supports transactions) so you have to
call commit() on the connection after doing updates.

> 
>  ########### db.execute('BEGIN') #############
>  db.execute('UPDATE users SET uid=? WHERE uid=?',(v['uid'],s.UID))

This is a fragile way to do it, your code won't work with a DB that
has real foreign keys (and maybe sqlite will get them one day).

A less fragile way of doing it is:

db = connection.cursor()

# First copy the row if it exists

db.execute( '''
    	insert into "users"
    	select ?, "name", adress, city, country, phone, picture
    	from "users" where "uid" = ?    	
    ''', (v['uid'],s.UID)
  )

>  db.execute('UPDATE sessions SET uid=? WHERE sid=?',(v['uid'],s.SID))

# Second update foriegn key tables to point to the new row
# (but only if the new row exists )

db.execute( '''
    	update "sessions" set "uid" = ?
    	where "uid" = ? 
    	and exists(
    	    	select * from "users" where "uid" = ?
    	  )
    ''',
    (v['uid'],s.SID, v['uid']) 
  )

#Do the same for the "groups" table, then

# finally delete the original row (again only if the new row exists )

db.execute( '''
    	delete from "users" 
    	where "uid" = ?
    	and exists(
    	    	select * from "users" where "uid" = ?
    	  )
    ''',
    (s.SID, v['uid']) 
  )

# Finally commit the transaction

connection.commit()

>  # only do this if there is no primary key conflict in the above
>  if db.ERROR == None: db.execute('UPDATE groups SET uid=? WHERE uid=?',
> (v['uid'],s.UID))

Python reports errors by throwing exceptions, so if you needed somthing
like this it would more likely be:

try:
  
  ... # somthing that errors up ...

catch sqlite3.DatabaseError:
  connection.rollback()

Rob.
-- 
http://www.victim-prime.dsl.pipex.com/


From clp2 at rebertia.com  Mon May 11 17:08:13 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 11 May 2009 14:08:13 -0700
Subject: How to replace constructor with factory method
In-Reply-To: <630cbc45-9809-45c8-addd-c229cd2d07d9@e23g2000vbe.googlegroups.com>
References: <630cbc45-9809-45c8-addd-c229cd2d07d9@e23g2000vbe.googlegroups.com>
Message-ID: <50697b2c0905111408n41450ecek34ec24cbe439254f@mail.gmail.com>

On Mon, May 11, 2009 at 1:39 PM,  <rogeeff at gmail.com> wrote:
> Hi,
>
> Just wonder if it's possible in Python.
>
> what I want is to tweak an existing Python class A with no
> constructor, so that A() results in fuctory method call?
>
> so o = A() instead being equivalent to:
>
> s = object()
> A.__init__(s)
> o = s
>
> becomes:
>
> o = my_factory_function( A )

I believe you'd need to override __new__ for that.
Docs on __new__: http://docs.python.org/reference/datamodel.html#object.__new__

Cheers,
Chris
-- 
http://blog.rebertia.com


From usernet at ilthio.net  Mon May 11 17:12:30 2009
From: usernet at ilthio.net (Tim Harig)
Date: Mon, 11 May 2009 21:12:30 GMT
Subject: [silly] Re: issue with twisted and reactor. Can't stop reactor
References: <mailman.0.1242074479.8015.python-list@python.org>
Message-ID: <2x0Ol.29775$YU2.5233@nlpi066.nbdc.sbc.com>

On 2009-05-11, Gabriel <gabriel at opensuse.org> wrote:
> Subject: issue with twisted and reactor. Can't stop reactor

Not having written anything using twisted I cannot help you much with your
code; but, I cannot resist commenting about your subject line:

I suspect that if are having an issue with your reactor after being hit by
a twister[d], then you probably have more at issue then your networking.
My suggestion would be to run or drive away quickly.


From rumpf_a at web.de  Mon May 11 17:19:01 2009
From: rumpf_a at web.de (rumpf_a at web.de)
Date: Mon, 11 May 2009 14:19:01 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<f964488e-eb74-44b8-a6e8-760d29192cb1@e24g2000vbe.googlegroups.com>
Message-ID: <2cf5a78f-87da-4ace-b895-6c8283302b22@o20g2000vbh.googlegroups.com>

On 10 Mai, 07:36, k... at fiber-space.de wrote:
> On 8 Mai, 17:48, Andreas Rumpf <Rump... at web.de> wrote:
>
> > Dear Python-users,
>
> > I invented a new programming language called "Nimrod" that combines Python's readability with C's performance. Please check it out:http://force7.de/nimrod/
> > Any feedback is appreciated.
>
> > Regards,
> > Andreas Rumpf
>
> > ______________________________________________________
> > GRATIS f?r alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!
> > Jetzt freischalten unterhttp://movieflat.web.de
>
> On a first impression it looks quite pleasant to me, your new
> language! Two obvious questions on a Python list.
>
> 1) How to interface with Nimrod from Python?
> 2) Lack of typed hash-tables. Is this one of those particular features
> that are planned to be implemented in version 0.80 and summarized
> under "generic containers"?

1) Via a wrapper that is in the works. It will work like embedding
Python into a C application.
2) Yes. Some syntactic sugar will probably be provided, e.g. a
constructor {} like Python. However, I have not made my mind
completely: Maybe they should be built-in? This would allow more
optimizations.


From kyrie at uh.cu  Mon May 11 17:26:49 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Mon, 11 May 2009 17:26:49 -0400
Subject: How to replace constructor with factory method
In-Reply-To: <630cbc45-9809-45c8-addd-c229cd2d07d9@e23g2000vbe.googlegroups.com>
References: <630cbc45-9809-45c8-addd-c229cd2d07d9@e23g2000vbe.googlegroups.com>
Message-ID: <200905111726.49772.kyrie@uh.cu>

On Monday 11 May 2009 04:39:41 pm rogeeff at gmail.com wrote:

> so o = A() instead being equivalent to:
>
> s = object()
> A.__init__(s)
> o = s

Actually, it would be more like this:

s = A.__new__(A)
if isinstance(s,A):
    A.__init__(s)
o = s

> o = my_factory_function( A )

You could tweak:
*) A's constructor (__new__) [keep in mind the 'insinstance' part]
*) A's initializer (changing the type, and so on... ugly, fragile and 
dangerous, don't ever do it!)
*) A's metaclass (the instantiation happens in the metaclass' __call__ method,
you could rewrite it to suit your needs, as in [1]
*) or, just use a method named A instead of the A class (as the 
multiprocessing.Queue function does)

I would use the 4th option. The fact that python classes are callable allows 
you to switch from instantiation to function calling without having to change 
the user's code.


[1] http://trucosos.crv.matcom.uh.cu/snippets/95/

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From samwyse at gmail.com  Mon May 11 17:44:03 2009
From: samwyse at gmail.com (samwyse)
Date: Mon, 11 May 2009 14:44:03 -0700 (PDT)
Subject: creating classes with mix-ins
References: <d6409bb3-f2ed-4964-942a-b0698060a7f0@e24g2000vbe.googlegroups.com>
Message-ID: <09108020-503e-44ae-acee-943374300e18@e24g2000vbe.googlegroups.com>

On May 11, 1:16?pm, samwyse <samw... at gmail.com> wrote:
> I'm writing a class that derives it's functionality from mix-ins.

While waiting, I gave a try at using class decorators.  Here's what I
came up with:

def add_methods(*m_list, **kwds):
    def wrapper(klass):
        for m_name in m_list:
            def template(self, which, username, password, *args):
                if not self.security.isAuthorised(username, password,
which, m_name):
                    raise Exception('Unauthorised access')
                return getattr(self.blog, m_name)(which, *args)
            dotted_name = kwds.get('prefix', '') + m_name
            template.__name__ = dotted_name
            template.__doc__ = dotted_name
            setattr(klass, dotted_name, template)
        return klass
    return wrapper

@add_methods('newPost', 'editPost', 'getPost', 'newMediaObject',
             'getCategories', 'getRecentPosts',
             prefix='metaWeblog.')
class MetaWeblog(object):
    def __init__(self,
                 securityHandler=SimpleSecurityHandler,
                 blogHandler=SimpleBlogHandler):
        self.security = securityHandler()
        self.blog = blogHandler()

if __name__ == '__main__':
    server = SimpleXMLRPCServer(("localhost", 8080))
    server.register_instance(MetaWeblog())
    server.register_introspection_functions()
    server.serve_forever()

The problem that I'm having is that when I call newPost,
SimpleBlogHandler.getRecentPosts gets invoked.  Apparently add_methods
isn't generating unique templates.  I think I need to move 'template'
into another function, but I'm starting to wonder if metaclasses might
work better.  Any ideas?


From clp2 at rebertia.com  Mon May 11 17:45:37 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 11 May 2009 14:45:37 -0700
Subject: Your Favorite Python Book
In-Reply-To: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
Message-ID: <50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>

On Mon, May 11, 2009 at 1:44 PM, Sam Tregar <sam at tregar.com> wrote:
> Greetings.? I'm working on learning Python and I'm looking for good books to
> read.? I'm almost done with Dive into Python and I liked it a lot. I found
> Programming Python a little dry the last time I looked at it, but I'm more
> motivated now so I might return to it.? What's your favorite?? Why?

I like "Python in a Nutshell" as a reference book, although it's now
slightly outdated given Python 3.0's release (the book is circa 2.5).

Cheers,
Chris
-- 
http://blog.rebertia.com


From python at bdurham.com  Mon May 11 17:52:41 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 11 May 2009 17:52:41 -0400
Subject: Your Favorite Python Book
In-Reply-To: <50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>
Message-ID: <1242078761.3662.1314940065@webmail.messagingengine.com>

Sam,

In no specific order (I brought them all):

Wesley Chun's "Core Python Programming"
David Mertz's "Text Processing in Python" (older, but excellent)
Mark Lutz's "Learning Python"

All highly recommended.

Best of luck on your Python journey!

Regards,
Malcolm


From rumpf_a at web.de  Mon May 11 17:55:46 2009
From: rumpf_a at web.de (rumpf_a at web.de)
Date: Mon, 11 May 2009 14:55:46 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
Message-ID: <57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>

On 10 Mai, 10:40, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> Andreas Rumpf <Rump... at web.de> writes:
> > I invented a new programming language called "Nimrod" that combines
> > Python's readability with C's performance. Please check it out:
> >http://force7.de/nimrod/Any feedback is appreciated.
>
> Looks nice in many ways. ?You also know about PyPy and Felix
> (felix.sf.net)?
>
Nimrod has very different goals from PyPy, I cannot comment on Felix.

> It seems a little bit hackish that the character type is a byte.
> Python did something like that but it ended up causing a lot of
> hassles when dealing with real Unicode. ?I think you have to bite
> the bullet and have separate byte and char types, where char=unicode.
>
I am dissatisfied with Python's (or Java's) Unicode handling:
1) IO overhead to convert UTF-8 (defacto standard on UNIX) into
UTF-16.
2) For simple tasks the output file will be in the same encoding as
the input file automatically.
3) Most text files have no header specifying the encoding anyway. How
should the programm/programmer know? And often he does not need to
know anyway.
4) UTF-16 (or 32) use more memory.
5) In particular using UTF-16 internally does not make sense: It just
encourages programmers to ignore surrogates. Unicode has more than
2^16 characters nowadays.

> It scares me a little about how there are references that can have
> naked pointers, escape the gc, etc. ?It would be good if the type
> system were powerful enough to guarantee the absence of these effects
> in some piece of data, unless the data is somehow marked with an
> "unsafe" type.
>
Well "ptr" is unsafe, "ref" is not; mixing the two requires a "cast".
Basically "cast" is the only unsafe feature.

> I'd like to see ML-like algebraic types with pattern matching, not
> just tuple unpacking. ?
>
Me too.

> The generic system should be able to analyze the AST of type
> parameters, e.g. iterator<T> would be able to automatically generate
> an iterator over a list, a tree, or some other type of structure, by
> actually figuring out at compile time how T is constructed.
>
Interesting idea. Right now the generic iterator is named "items" and
can be overloaded for user-defined types.

> It's sort of surprising that the compiler is written in a Pascal
> subset. ?Why not implement in Nimrod directly, and bootstrap through C?
>
That is already the case: The Pascal version is translated to Nimrod
and than compiles itself. Bootstrapping works.

> The language and library are missing arbitrary precision integer
> arithmetic, using GMP or something like that.
>
True, but currently not a high priority for me.

> It would be good to also be able to have value serialization and
> deserialization to both human readable (nested lists, etc) and binary
> (for IPC) formats.
>
Yes. Planned for version 0.9.0.

> It's not obvious from the blurbs whether simple functional programming
> is supported, e.g. how would you implement a function like "map" or
> "filter"? ?What would the types be of those two functions?
>
proc map[T, S](data: openarray[T], op: proc(x: T): S): seq[S] =
  result = @[]
  for d in items(data): result.add(op(d))

Or - if you don't want the "openarray[T]" restriction:
proc map[T, S, U](data: T, op: proc(x: U): S): seq[S] =
  result = @[]
  for d in items(data): result.add(op(d))


> The roadmap says you might implement threading with transactional
> memory. ?How will the transactional memory interact with mutable data?
> Are you going to use OS threads, lightweight threads, or both?
Probably both. Lightweight threads could be done using coroutines and
explicit task switching. OS threads with transactional memory. The
plan is to use LLVM as a backend and perhaps http://tinystm.org/. Of
course, this is only wishful thinking. ;-)


From toby at tobiah.org  Mon May 11 17:59:43 2009
From: toby at tobiah.org (Tobiah)
Date: Mon, 11 May 2009 14:59:43 -0700
Subject: There may be a much better way to manage artillery.
References: <_5JNl.4895$qP.3696@newsfe03.iad>
	<mailman.5399.1241999311.11746.python-list@python.org>
Message-ID: <pan.2009.05.11.21.59.43.372232@tobiah.org>

On Mon, 11 May 2009 00:48:25 +0100, Rhodri James wrote:

> On Mon, 11 May 2009 00:06:34 +0100, Tobiah <toby at tobiah.org> wrote:
> 
> [Snippety snip]
> 
>> I wanted the bullets to be responsible for destroying themselves, but a
>> little Googling brought me to points about dangling references and how
>> an object is not allowed (nor does it seem to have the means) to destroy
>> itself. That's why I made this wrapper class for all of the bullets.
> 
> An object can, however, erase its representation from the screen and tell
> whatever control system is keeping track of objects to forget about it. 
> Once the last reference to the object is deleted, the object will be
> garbage collected.
> 
> What framework are you writing your game in?  Pygame has facilities for
> handling this sort of thing fairly straightforwardly.

Actually I am using Pygame, although I'm quite new to it.  Which
module has the facilities that you describe?

Thanks,

Toby


From exarkun at divmod.com  Mon May 11 18:09:19 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 11 May 2009 18:09:19 -0400
Subject: issue with twisted and reactor. Can't stop reactor
In-Reply-To: <1adde6890905111340o7ca2b19er762a76518eac9d05@mail.gmail.com>
Message-ID: <20090511220919.21531.119723250.divmod.quotient.19655@henry.divmod.com>

On Mon, 11 May 2009 17:40:57 -0300, Gabriel <gabriel at opensuse.org> wrote:
>Hello all!,
>
>I'm trying to implement a simple one way communication using twisted.
>
> [snip]
>
>When I call send the first time it works fine, when I call send a
>second time the sender hangs.
> [snip]

None of the reactors in Twisted are restartable.  You can run and stop them
once.  After you've stopped a reactor, you cannot run it again.  This is the
cause of your problem.

Jean-Paul


From rumpf_a at web.de  Mon May 11 18:26:14 2009
From: rumpf_a at web.de (rumpf_a at web.de)
Date: Mon, 11 May 2009 15:26:14 -0700 (PDT)
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.5390.1241977162.11746.python-list@python.org>
Message-ID: <d201b2cb-4b13-4970-a44b-9be1b553e293@j12g2000vbl.googlegroups.com>

> One question I ask myself upon seeing a new language is if it is possible
> to program amb (amb=ambiguous) operator in it. This page gives a very
> nice, "code first" explanation of amb and how it is supposed to work:
>
> http://www.randomhacks.net/articles/2005/10/11/amb-operator
>
Hm. I am not sure either. To me, it looks like a constraint solver by
using brute force. It seems to require continuations. AFAIK
continuations are extremely hard to implement efficiently, so probably
it won't be done in Nimrod.


From rhodri at wildebst.demon.co.uk  Mon May 11 18:39:51 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 11 May 2009 23:39:51 +0100
Subject: There may be a much better way to manage artillery.
In-Reply-To: <pan.2009.05.11.21.59.43.372232@tobiah.org>
References: <_5JNl.4895$qP.3696@newsfe03.iad>
	<mailman.5399.1241999311.11746.python-list@python.org>
	<pan.2009.05.11.21.59.43.372232@tobiah.org>
Message-ID: <op.utsekphla8ncjz@gnudebst>

On Mon, 11 May 2009 22:59:43 +0100, Tobiah <toby at tobiah.org> wrote:

> On Mon, 11 May 2009 00:48:25 +0100, Rhodri James wrote:
>
>> On Mon, 11 May 2009 00:06:34 +0100, Tobiah <toby at tobiah.org> wrote:
>>
>> [Snippety snip]
>>
>>> I wanted the bullets to be responsible for destroying themselves, but a
>>> little Googling brought me to points about dangling references and how
>>> an object is not allowed (nor does it seem to have the means) to  
>>> destroy
>>> itself. That's why I made this wrapper class for all of the bullets.
>>
>> An object can, however, erase its representation from the screen and  
>> tell
>> whatever control system is keeping track of objects to forget about it.
>> Once the last reference to the object is deleted, the object will be
>> garbage collected.
>>
>> What framework are you writing your game in?  Pygame has facilities for
>> handling this sort of thing fairly straightforwardly.
>
> Actually I am using Pygame, although I'm quite new to it.  Which
> module has the facilities that you describe?

Looking at the code, it's not quite as straightforward as I was making
out!  I'm used to writing games using a veneer library which has a
Screen class that handles all the basic drawing functions and the main
processing loop.  It keeps a list of objects, and is responsible for
calling appropriate methods on those objects when things happen.
The Object class has a destroy() method which erases the object and
asks the Screen to remove it from its internal list.  Needless to
say there is a lot of list copying going on in the Screen class
main loop to make sure that lists aren't corrupted as they are being
iterated through.

This code was written back in the days of Python 2.1, and hasn't had
more than simple bug-fixing done to it since.  We're contemplating a
rewrite when we shift to Python 3, and we're putting that decision
off as long as possible :-)  You're welcome to use or scavenge from
it, as it's on a fairly free license.  It's available here:

   http://www.livewires.co.uk/python/home

(though apparently I must go and bug the webmaster about putting the
latest version of the worksheets up.  What's there at the moment is
years out of date!)

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From deets at nospam.web.de  Mon May 11 18:40:05 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 12 May 2009 00:40:05 +0200
Subject: how to consume .NET webservice
In-Reply-To: <gua1j0$tra$1@adenine.netfront.net>
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net>
Message-ID: <76rnq5F1dp6gpU1@mid.uni-berlin.de>

namekuseijin schrieb:
> bav escreveu:
>> question from a python newbie;
>>
>>   how can i consume in python language, a .NET web service, passing
>>   a string array as parameter in some easy steps?
> 
> Unless Microsoft extended the standard in any way, then it should be 
> just as you consume any web service, I guess. ;)

Microsoft *created* the standard.. .and how feasible it is to work with 
it, see this :

http://72.249.21.88/nonintersecting/?year=2006&monthnum=11&day=15&name=the-s-stands-for-simple&page=

Diez


From mensanator at aol.com  Mon May 11 18:40:49 2009
From: mensanator at aol.com (Mensanator)
Date: Mon, 11 May 2009 15:40:49 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
Message-ID: <4519cc9d-f765-4f55-81b2-58abfa20b988@p4g2000vba.googlegroups.com>

On May 11, 4:55?pm, rump... at web.de wrote:
> On 10 Mai, 10:40, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:> Andreas Rumpf <Rump... at web.de> writes:
> > > I invented a new programming language called "Nimrod" that combines
> > > Python's readability with C's performance. Please check it out:
> > >http://force7.de/nimrod/Anyfeedback is appreciated.
>
> > Looks nice in many ways. ?You also know about PyPy and Felix
> > (felix.sf.net)?
>
> Nimrod has very different goals from PyPy, I cannot comment on Felix.
>
> > It seems a little bit hackish that the character type is a byte.
> > Python did something like that but it ended up causing a lot of
> > hassles when dealing with real Unicode. ?I think you have to bite
> > the bullet and have separate byte and char types, where char=unicode.
>
> I am dissatisfied with Python's (or Java's) Unicode handling:
> 1) IO overhead to convert UTF-8 (defacto standard on UNIX) into
> UTF-16.
> 2) For simple tasks the output file will be in the same encoding as
> the input file automatically.
> 3) Most text files have no header specifying the encoding anyway. How
> should the programm/programmer know? And often he does not need to
> know anyway.
> 4) UTF-16 (or 32) use more memory.
> 5) In particular using UTF-16 internally does not make sense: It just
> encourages programmers to ignore surrogates. Unicode has more than
> 2^16 characters nowadays.
>
> > It scares me a little about how there are references that can have
> > naked pointers, escape the gc, etc. ?It would be good if the type
> > system were powerful enough to guarantee the absence of these effects
> > in some piece of data, unless the data is somehow marked with an
> > "unsafe" type.
>
> Well "ptr" is unsafe, "ref" is not; mixing the two requires a "cast".
> Basically "cast" is the only unsafe feature.
>
> > I'd like to see ML-like algebraic types with pattern matching, not
> > just tuple unpacking. ?
>
> Me too.
>
> > The generic system should be able to analyze the AST of type
> > parameters, e.g. iterator<T> would be able to automatically generate
> > an iterator over a list, a tree, or some other type of structure, by
> > actually figuring out at compile time how T is constructed.
>
> Interesting idea. Right now the generic iterator is named "items" and
> can be overloaded for user-defined types.
>
> > It's sort of surprising that the compiler is written in a Pascal
> > subset. ?Why not implement in Nimrod directly, and bootstrap through C?
>
> That is already the case: The Pascal version is translated to Nimrod
> and than compiles itself. Bootstrapping works.
>
> > The language and library are missing arbitrary precision integer
> > arithmetic, using GMP or something like that.
>
> True, but currently not a high priority for me.

Too bad. That makes Nimrod officially "worthless", i.e., of no
value to me.

>
> > It would be good to also be able to have value serialization and
> > deserialization to both human readable (nested lists, etc) and binary
> > (for IPC) formats.
>
> Yes. Planned for version 0.9.0.
>
> > It's not obvious from the blurbs whether simple functional programming
> > is supported, e.g. how would you implement a function like "map" or
> > "filter"? ?What would the types be of those two functions?
>
> proc map[T, S](data: openarray[T], op: proc(x: T): S): seq[S] =
> ? result = @[]
> ? for d in items(data): result.add(op(d))
>
> Or - if you don't want the "openarray[T]" restriction:
> proc map[T, S, U](data: T, op: proc(x: U): S): seq[S] =
> ? result = @[]
> ? for d in items(data): result.add(op(d))
>
> > The roadmap says you might implement threading with transactional
> > memory. ?How will the transactional memory interact with mutable data?
> > Are you going to use OS threads, lightweight threads, or both?
>
> Probably both. Lightweight threads could be done using coroutines and
> explicit task switching. OS threads with transactional memory. The
> plan is to use LLVM as a backend and perhapshttp://tinystm.org/. Of
> course, this is only wishful thinking. ;-)



From ljqyhvrl at glvn84004389.net  Mon May 11 18:50:59 2009
From: ljqyhvrl at glvn84004389.net (Raoul Gough)
Date: Mon, 11 May 2009 23:50:59 +0100
Subject: MacPython 3.0.1 installation problem, no /usr/local/bin/python*
References: <m2vdoad6fd.fsf@yahoo.co.uk>
	<ec96e1390905090735p40bd6c21w5606c521c4c161e5@mail.gmail.com>
	<mailman.5368.1241929710.11746.python-list@python.org>
Message-ID: <m2fxfbdzjg.fsf@yahoo.co.uk>

Ned Deily <nad at acm.org> writes:

> In article 
> <ec96e1390905090735p40bd6c21w5606c521c4c161e5 at mail.gmail.com>,
>  Benjamin Kaplan <benjamin.kaplan at case.edu> wrote:
>> On Sat, May 9, 2009 at 4:30 AM, Raoul Gough
>> <bvdmyrby at jyxk16274849.net> wrote:
[snip]
>> > So did something go wrong with the installer, or is it all
>> > supposed to work somehow differently?
>> 
>> Because Python 3 breaks compatibility with Python 2, the installers
>> don't install it as the default. The executable should be at
>> /usr/local/bin/python3.0
>
> By default, the 3.0.1 installer does not install any links in
> /usr/local/bin.  To do so, run or re-run the installer, click
> Customize, and then select the "UNIX command-line tools" package.
> That creates /usr/local/python3.0 and /usr/local/python links, among
> others.

Ah, I see! Thanks, I missed the "Customize" option during the install
dialogues. That takes care of the symlinks in /usr/local/bin, although
I notice that it still leaves some dangling symlinks under
/Library/Frameworks/Python.framework that point to a nonexistent
"Current" directory. I guess it's safe to ignore these.

-- 
Raoul Gough.


From gabriel at opensuse.org  Mon May 11 18:51:50 2009
From: gabriel at opensuse.org (Gabriel)
Date: Mon, 11 May 2009 19:51:50 -0300
Subject: issue with twisted and reactor. Can't stop reactor
In-Reply-To: <20090511220919.21531.119723250.divmod.quotient.19655@henry.divmod.com>
References: <20090511220919.21531.119723250.divmod.quotient.19655@henry.divmod.com>
Message-ID: <4A08AC06.6030708@opensuse.org>

Jean-Paul Calderone escribi?:
 > None of the reactors in Twisted are restartable.  You can run and
stop them
> once.  After you've stopped a reactor, you cannot run it again.  This is
> the
> cause of your problem.
> 
> Jean-Paul

I see.
Is it possible to do what I want using twisted? or
I should found another way?

-- 
Kind regards.


From rhodri at wildebst.demon.co.uk  Mon May 11 18:53:20 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 11 May 2009 23:53:20 +0100
Subject: Wrapping comments
In-Reply-To: <towb-B9F4E2.09394811052009@news.individual.de>
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
	<mailman.5400.1242000728.11746.python-list@python.org>
	<towb-B9F4E2.09394811052009@news.individual.de>
Message-ID: <op.utse66qna8ncjz@gnudebst>

On Mon, 11 May 2009 08:39:48 +0100, Tobias Weber <towb at gmx.net> wrote:

> In article <mailman.5400.1242000728.11746.python-list at python.org>,
>  "Rhodri James" <rhodri at wildebst.demon.co.uk> wrote:
>
>> What on earth are you talking about?  '#' has its own key on a UK layout
>
> Not on Apple keyboards, and the emacs release in question is Mac only.

My commiserations.  That was a bad design decision on so many levels.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gert.cuykens at gmail.com  Mon May 11 18:59:49 2009
From: gert.cuykens at gmail.com (gert)
Date: Mon, 11 May 2009 15:59:49 -0700 (PDT)
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
Message-ID: <86fd1d41-2e7d-4b91-a9fc-8a9f4c05e119@e20g2000vbc.googlegroups.com>

On 11 mei, 23:07, Rob Williscroft <r... at freenet.co.uk> wrote:
> gert wrote in news:d7591495-4661-4243-ad7e-f142d8244e88
> @e24g2000vbe.googlegroups.com in comp.lang.python:
>
> > I am trying to do this in a single transaction, the 3 separate
> > statements work fine, but i am screwed if they are not executed
> > together.
>
> Well you're in luck, Python DBAPI 2 connections handle this
> for you, you do need to call commit() on the connection though.
>
> The default, for DBAPI 2 connections, is that all "work" occurs in a
> transaction (if the DB actually supports transactions) so you have to
> call commit() on the connection after doing updates.
>
>
>
> > ?########### db.execute('BEGIN') #############
> > ?db.execute('UPDATE users SET uid=? WHERE uid=?',(v['uid'],s.UID))
>
> This is a fragile way to do it, your code won't work with a DB that
> has real foreign keys (and maybe sqlite will get them one day).
>
> A less fragile way of doing it is:
>
> db = connection.cursor()
>
> # First copy the row if it exists
>
> db.execute( '''
> ? ? ? ? insert into "users"
> ? ? ? ? select ?, "name", adress, city, country, phone, picture
> ? ? ? ? from "users" where "uid" = ? ? ? ? ?
> ? ? ''', (v['uid'],s.UID)
> ? )
>
> > ?db.execute('UPDATE sessions SET uid=? WHERE sid=?',(v['uid'],s.SID))
>
> # Second update foriegn key tables to point to the new row
> # (but only if the new row exists )
>
> db.execute( '''
> ? ? ? ? update "sessions" set "uid" = ?
> ? ? ? ? where "uid" = ?
> ? ? ? ? and exists(
> ? ? ? ? ? ? ? ? select * from "users" where "uid" = ?
> ? ? ? ? ? )
> ? ? ''',
> ? ? (v['uid'],s.SID, v['uid'])
> ? )
>
> #Do the same for the "groups" table, then
>
> # finally delete the original row (again only if the new row exists )
>
> db.execute( '''
> ? ? ? ? delete from "users"
> ? ? ? ? where "uid" = ?
> ? ? ? ? and exists(
> ? ? ? ? ? ? ? ? select * from "users" where "uid" = ?
> ? ? ? ? ? )
> ? ? ''',
> ? ? (s.SID, v['uid'])
> ? )
>
> # Finally commit the transaction
>
> connection.commit()
>
> > ?# only do this if there is no primary key conflict in the above
> > ?if db.ERROR == None: db.execute('UPDATE groups SET uid=? WHERE uid=?',
> > (v['uid'],s.UID))
>
> Python reports errors by throwing exceptions, so if you needed somthing
> like this it would more likely be:
>
> try:
>
> ? ... # somthing that errors up ...
>
> catch sqlite3.DatabaseError:
> ? connection.rollback()
>
> Rob.
> --http://www.victim-prime.dsl.pipex.com/

ok go it, thanks


From Shawn at Milochik.com  Mon May 11 19:35:44 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Mon, 11 May 2009 19:35:44 -0400
Subject: Your Favorite Python Book
In-Reply-To: <1242078761.3662.1314940065@webmail.messagingengine.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>
	<1242078761.3662.1314940065@webmail.messagingengine.com>
Message-ID: <2dc0c81b0905111635x5a598d8bh74e4f7fa76e20b33@mail.gmail.com>

On Mon, May 11, 2009 at 5:52 PM,  <python at bdurham.com> wrote:
> Sam,
>
> In no specific order (I brought them all):
>
> Wesley Chun's "Core Python Programming"
> David Mertz's "Text Processing in Python" (older, but excellent)
> Mark Lutz's "Learning Python"
>
> All highly recommended.
>
> Best of luck on your Python journey!
>
> Regards,
> Malcolm
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I second the Wesley Chun recommendation wholeheartedly. Also, "Text
Processing in Python" is available for free online.

http://gnosis.cx/TPiP/

Shawn


From http  Mon May 11 19:45:58 2009
From: http (Paul Rubin)
Date: 11 May 2009 16:45:58 -0700
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org>
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
Message-ID: <7x4ovrkxu1.fsf@ruckus.brouhaha.com>

rumpf_a at web.de writes:
> I am dissatisfied with Python's (or Java's) Unicode handling:
> 1) IO overhead to convert UTF-8 (defacto standard on UNIX) into
> UTF-16.

So use UTF-8 internally.  You can still iterate through strings
efficiently.  Random access would take a performance hit.  When that's
an issue, the programmer can choose to use a char array (char =
UCS-4).  The same generic functions could largely handle both types.
 
> That is already the case: The Pascal version is translated to Nimrod
> and than compiles itself. Bootstrapping works.

I meant why not get rid of the translation step and implement the
compiler in idiomatic Nimrod.


> Or - if you don't want the "openarray[T]" restriction:
> proc map[T, S, U](data: T, op: proc(x: U): S): seq[S] =
>   result = @[]
>   for d in items(data): result.add(op(d))

This is hard for me to comprehend but I mayb look at the docs to try to
figure it out.

> The plan is to use LLVM as a backend and perhaps
> http://tinystm.org/. Of course, this is only wishful thinking. ;-)

Oh cool, I didn't know about tinystm.  But, my question about
mutability is how you protect STM transactions when other threads can
have references into shared mutable structures and clobber the
referents.  GHC uses its type system to prevent that, but I don't see
how Nimrod can really do the same, especially without GHC's rich set
of immutable types including stuff like immutable maps.

Have you ever looked at Tim Sweeney's presentation "The Next
Mainstream Programming Language"?  It's at:

http://www.st.cs.uni-saarland.de/edu/seminare/2005/advanced-fp/docs/sweeny.pdf


From tjreedy at udel.edu  Mon May 11 20:04:37 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 11 May 2009 20:04:37 -0400
Subject: OOP & Abstract Classes
In-Reply-To: <bZ%Nl.55092$ew.38769@newsfe24.iad>
References: <SZWNl.16133$hX2.2435@newsfe19.iad>	<slrnh0grfa.8na.nick@irishsea.home.craig-wood.com>
	<bZ%Nl.55092$ew.38769@newsfe24.iad>
Message-ID: <guaeej$ort$1@ger.gmane.org>

Adam Gaskins wrote:
> Wow, thanks Nick! This is just what I was looking for!

I agree that Nick's semi-abstract class is what you need.
After doing some subclasses, you may discover that there is more common 
code that you can factor out and push to the base class.  You may also 
find it convenient to derive a mock subclass that returns simulated data 
so you can test user code initially without involving (or waiting on) 
real devices.



From rtomek at ceti.com.pl  Mon May 11 20:10:06 2009
From: rtomek at ceti.com.pl (Tomasz Rola)
Date: Tue, 12 May 2009 02:10:06 +0200
Subject: Nimrod programming language
In-Reply-To: <d201b2cb-4b13-4970-a44b-9be1b553e293@j12g2000vbl.googlegroups.com>
References: <159308160@web.de>
	<mailman.5390.1241977162.11746.python-list@python.org>
	<d201b2cb-4b13-4970-a44b-9be1b553e293@j12g2000vbl.googlegroups.com>
Message-ID: <Pine.LNX.4.64.0905120140001.2367@tau.ceti.pl>

On Mon, 11 May 2009, rumpf_a at web.de wrote:

> > One question I ask myself upon seeing a new language is if it is possible
> > to program amb (amb=ambiguous) operator in it. This page gives a very
> > nice, "code first" explanation of amb and how it is supposed to work:
> >
> > http://www.randomhacks.net/articles/2005/10/11/amb-operator
> >
> Hm. I am not sure either. To me, it looks like a constraint solver by
> using brute force.

Yes, kind of. From what I understand [1], it's goal is to simulate 
nondeterministic "get right answer in one try", only this "one try" 
requires browsing the solution space (because we have only "classic" 
hardware). It is easy to use amb in wrong way, but I can see some cases 
when I would like it.

[1] John McCarthy's paper still waits to be read by me, so... Ok, I have 
just had a look at it and it seems that Ruby implementation is a bit 
primitive compared to original concept. But still, this is what would be 
needed in most real life cases, I suppose.

I think ability to define amb would allow me to write more concise code. 
As far as I can tell, this kind of stuff plays more and more important 
role in my programing.

> It seems to require continuations. AFAIK
> continuations are extremely hard to implement efficiently, so probably
> it won't be done in Nimrod.

Pity, a little. But not really big problem for me. Nimrod may be 
interesting anyway, time will tell :-).

Regards,
Tomasz Rola

--
** A C programmer asked whether computer had Buddha's nature.      **
** As the answer, master did "rm -rif" on the programmer's home    **
** directory. And then the C programmer became enlightened...      **
**                                                                 **
** Tomasz Rola          mailto:tomasz_rola at bigfoot.com             **


From namekuseijin.nospam at gmail.com  Mon May 11 20:27:56 2009
From: namekuseijin.nospam at gmail.com (namekuseijin)
Date: Mon, 11 May 2009 21:27:56 -0300
Subject: how to consume .NET webservice
In-Reply-To: <76rnq5F1dp6gpU1@mid.uni-berlin.de>
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net>
	<76rnq5F1dp6gpU1@mid.uni-berlin.de>
Message-ID: <guaf4j$1fsn$1@adenine.netfront.net>

Diez B. Roggisch wrote:
> namekuseijin schrieb:
>> bav escreveu:
>>> question from a python newbie;
>>>
>>>   how can i consume in python language, a .NET web service, passing
>>>   a string array as parameter in some easy steps?
>>
>> Unless Microsoft extended the standard in any way, then it should be 
>> just as you consume any web service, I guess. ;)
> 
> Microsoft *created* the standard.. 

No:

http://en.wikipedia.org/wiki/Web_service

It's a W3C internet standard.  Microsoft is one of many software 
companies behind the Consortium.

Here's the relevant official standards:

http://www.w3.org/2002/ws/#documents


From davea at ieee.org  Mon May 11 20:30:37 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 11 May 2009 20:30:37 -0400
Subject: Complete frustration
In-Reply-To: <4A085B14.2060908@hughes.net>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>
	<4A085B14.2060908@hughes.net>
Message-ID: <4A08C32D.3020904@ieee.org>



norseman wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">hellcats 
> wrote:
>> I have Python2.5 installed on Windows XP. Whenever I double click on a
>> something.pyw file, IDLE launches and opens something.pyw in the
>> editor. I would prefer to actually *RUN* the program, not edit it. If
>> I want to edit it then I'll choose the "Edit with IDLE" context menu.
>> So I then have to press F5 to get the program to execute. Now I have
>> my program's windows along with two IDLE windows cluttering my screen
>> and task bar. WHAT IS GOING ON? I've tried changing the file
>> association to python.exe, and that works, but just ONCE (even if I
>> choose "always use the slected program to launch this kind of file").
>> IDLE may be great and all, but I fricken' don't want to see it every
>> time I just want to run a python program!!!!!
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
>>
> ------------------------
> I agree completely.  Check the Python-List archives. Look for a file 
> that is dated July 8, 2008 (07/08/2008) that was sent by norseman.
>
> It works for me.
>
>
> Steve
>
> </div>
For a Unix person, you sure act like you know Windows.  But changing the 
PATH environment variable affects a command typed in the shell, but does 
not affect what happens when you either type the name of a python script 
directly, or when you double-click on such a file.  That's controlled by 
file associations.  (PATH isn't the answer in Unix either, most shells 
use the shebang at the beginning of the script.)

File associations can be controlled in a number of ways.  OPEN-WITH is 
one way.  REGEDIT is another.  In fact, any program can modify these 
settings, including your own scripts.  Something is changing things back 
on you.  But once you're having the problem of things reverting 
"automatically," a command line tool is sometimes the easiest.

Two built-in commands (they're inside the cmd.exe shell) can help.  
They're ASSOC and FTYPE

Since the extension you're bothered by is .pyw, try the following:

C:>  assoc .pyw
.pyw=Python.NoConFile

C:> ftype Python.NoConFile
Python.NoConFile="C:\ProgFiles\Python26\pythonw.exe" "%1" %*


Type them once and copy/paste results somewhere.

Then fix the problem, and look again.  Check that they work by 
double-clicking a xxx.pyw file in Explorer.

Now, run other things, especially IDLE, and recheck these two commands 
to see if something changed.  If it did, then blame whatever program you 
just ran.

My guess is that it changed when some Python installation was done.  And 
some programs have a habit of continually resetting their own 
associations.  Sometimes this is configurable, sometimes you just have 
to stop using the brain-dead program.

Notes:  your path is unlikely to be the same as mine, so replace the 
C:\ProgFiles...  string as appropriate to your preferred Python version 
location. Note you want Pythonw.exe, or you'll wind up with an extra 
shell window.   You can do the same thing for the .py extension, which 
should wind up running python.exe.  And you can make a simple two-line 
batch file to set these (assoc/ftype).  If you had several such batch 
files you could change the default python very easily.  Unlike 
environment variables, these associations are global, across all users, 
across all applications.  So changes made in one shell affect any other 
shells, as well as the Explorer windows.

Final note:  once you've got these right, you can run a script in the 
obvious way (like Unix).
    myprogram.py  parm1 parm2
will actually run    python.exe  myprogram.py  parm1 parm2

And if you add a .PY and .PYW to  PATHEXT environment variable, you can 
just run
    myprogram parm1 parm2
without any extension on the script name.   This should normally be done 
in the Control Panel->Environment vars  so it'll work in multiple DOS 
boxes, same as all environment variable changes.



From ldo at geek-central.gen.new_zealand  Mon May 11 20:37:20 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 12:37:20 +1200
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org>
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
Message-ID: <guagc0$2ji$2@lust.ihug.co.nz>

In message <57f4c81a-3537-49fa-a5f6-
a0cc0d43d599 at o14g2000vbo.googlegroups.com>, rumpf_a at web.de wrote:

> I am dissatisfied with Python's (or Java's) Unicode handling:
> 1) IO overhead to convert UTF-8 (defacto standard on UNIX) into
> UTF-16.

Are you sure they're using UTF-16? I would use UCS-2 or UCS-4.



From ldo at geek-central.gen.new_zealand  Mon May 11 20:44:57 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 12:44:57 +1200
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
References: <mailman.5282.1241783298.11746.python-list@python.org>
	<gu6i38$jhk$1@panix3.panix.com>
	<mailman.5375.1241962005.11746.python-list@python.org>
	<gu9fr2$je5$1@panix3.panix.com>
	<mailman.5.1242076536.8015.python-list@python.org>
Message-ID: <guagq9$361$1@lust.ihug.co.nz>

In message <mailman.5.1242076536.8015.python-list at python.org>, Geoff 
Gardiner wrote:

> @Lawrence D'Oliveiro:
> ...

I see that you published my unobfuscated e-mail address on USENET for all to 
see. I obfuscated it for a reason, to keep the spammers away. I'm assuming 
this was a momentary lapse of judgement, for which I expect an apology. 
Otherwise, it becomes grounds for an abuse complaint to your ISP.



From socyl at 987jk.com.invalid  Mon May 11 21:55:51 2009
From: socyl at 987jk.com.invalid (kj)
Date: Tue, 12 May 2009 01:55:51 +0000 (UTC)
Subject: OS X: How to play .wav file w/Python?
Message-ID: <guakv7$h81$1@reader1.panix.com>


Hi. I'm trying to learn how to play a .wav file in OS X with Python.
I tried the following, which ran without errors, but produced
nothing audible (even though the file bell.wav plays perfectly well
otherwise, e.g. view the Finder's Preview):

import pygame.mixer

pygame.mixer.init()
pygame.mixer.Sound("bell.wav").play
print "done"


What am I doing wrong?

TIA!

kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From pavlovevidence at gmail.com  Mon May 11 22:01:13 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 11 May 2009 19:01:13 -0700 (PDT)
Subject: creating classes with mix-ins
References: <d6409bb3-f2ed-4964-942a-b0698060a7f0@e24g2000vbe.googlegroups.com>
Message-ID: <fe808a4d-26e0-4003-be1a-2e768d7d81cc@r13g2000vbr.googlegroups.com>

On May 11, 11:16?am, samwyse <samw... at gmail.com> wrote:
> I'm writing a class that derives it's functionality from mix-ins.
> Here's the code:
>
> ? ? def boilerplate(what): ? # This used to be a decorator, but all of
> the
> ? ? ? ? ##what = f.__name__ ?# function bodies turned out to be
> 'pass'.
> ? ? ? ? 'Validate the user, then call the appropriate plug-in.'
> ? ? ? ? def template(self, which, username, password, *args):
> ? ? ? ? ? ? if not self.security.isAuthorised(username, password,
> which, what):
> ? ? ? ? ? ? ? ? raise Exception('Unauthorised access')
> ? ? ? ? ? ? return getattr(self.blog, what)(which, *args)
> ? ? ? ? template.__name__ = what
> ? ? ? ? template.__doc__ = getattr(self.blog, what).__doc__
> ? ? ? ? return template
>
> ? ? class MetaWeblog(object):
> ? ? ? ? def __init__(self,
> ? ? ? ? ? ? ? ? ? ? ?securityHandler=SimpleSecurityHandler,
> ? ? ? ? ? ? ? ? ? ? ?blogHandler=SimpleBlogHandler):
> ? ? ? ? ? ? self.security = securityHandler()
> ? ? ? ? ? ? self.blog = blogHandler()
> ? ? ? ? newPost = boilerplate('newPost')
> ? ? ? ? editPost = boilerplate('editPost')
> ? ? ? ? getPost = boilerplate('getPost')
> ? ? ? ? # etc, etc, etc
>
> I'd like to replace the method definitions with a loop:
> ? ? ? ? for what in attr_list:
> ? ? ? ? ? ? setattr(klass, what, boilerplate(what))
>
> That begs the question of where I define 'klass' and 'attr_list'.
> Should I use a class decorator, or a metaclass?

Here's the thing: unless you have advance knowledge of the methods
defined by self.blog, you can't get the attr_list at class definition
time, which means neither the metaclass nor the decorator would be a
good approach.  If that's the case, you should define newPost,
editPost, and whatever other methods of self.blog as ordinary
attributes of self, within the init function.  boilerplate would be
the same except you would pass self to it and allow template to use it
from its nested scope (it would no longer be an instance method since
it's an ordinary attribute).

If you do know what the methods of self.blog will be, then that's
where you get attr_list from.  So, for instance, if blogHandler always
returns an object of type Blog, then you could inspect Blog's type
dict to see what methods are defined in it; in fact you probably want
to check the whole MRO for Blog, like this (untested):

attr_list = []
for cls in Blog.__mro__:
    for value in cls.__dict__:
        if is_wrapped_method(value):
            attr_list.append(value)


A metaclass is probably overkill to assign the wrapped blog methods.
I probably wouldn't even bother with the decorator, and just write the
loop after the class definition.  Then you can use MetaBlog directly
for klass.

class MetaBlog(object):
    ...

for what in attr_list:
    setattr(MetaBlog, what, boilerplate(what))


If it were the kind of thing I found myself doing often I'd refactor
into a decorator.


Carl Banks


From debl2NoSpam at verizon.net  Mon May 11 22:22:56 2009
From: debl2NoSpam at verizon.net (David Lees)
Date: Tue, 12 May 2009 02:22:56 GMT
Subject: Unable to install Pywin32 for Python 2.6.2
Message-ID: <445Ol.724$5F2.395@nwrddc01.gnilink.net>

I have no problem installing Python 2.6.2 for windows under XP SP3 and 
IDLE and the command line versions work fine.  When I run the pywin32 
installer downloaded from sourceforge (pywin32-212.win32-py2.6.exe) I 
get the following error message:

Traceback (most recent call last):
   File "<string>", line 565, in <module>
   File "<string>", line 291, in install
ImportError: Module use of python25.dll conflicts with this version of 
Python.
*** run_installscript: internal error 0xFFFFFFFF ***

I have tried uninstalling Python 2.6 and reinstalling, but still get the 
same message.  I do have Python 2.5.4 and its associated Pywin32 on the 
same machine, but I have a laptop with pywin32 installed for both python 
2.5 and 2.6.

TIA

David Lees


From wuwei23 at gmail.com  Mon May 11 22:47:29 2009
From: wuwei23 at gmail.com (alex23)
Date: Mon, 11 May 2009 19:47:29 -0700 (PDT)
Subject: OS X: How to play .wav file w/Python?
References: <guakv7$h81$1@reader1.panix.com>
Message-ID: <eb1d688f-6de3-4388-9666-7c036d4d28c9@y34g2000prb.googlegroups.com>

On May 12, 11:55?am, kj <so... at 987jk.com.invalid> wrote:
> import pygame.mixer
>
> pygame.mixer.init()
> pygame.mixer.Sound("bell.wav").play
> print "done"
>
> What am I doing wrong?

Your first mistake is not pasting here the traceback you received.
That always makes it easier to assist with problems like this.

However, my guess is it's this line:

> pygame.mixer.Sound("bell.wav").play

'play' is a method, which means you need to call it. Try the following
instead:

> pygame.mixer.Sound("bell.wav").play()

And let us know how that goes :)


From aahz at pythoncraft.com  Mon May 11 22:50:08 2009
From: aahz at pythoncraft.com (Aahz)
Date: 11 May 2009 19:50:08 -0700
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
Message-ID: <guao50$1jv$1@panix3.panix.com>

In article <Xns9C08E179B66D8rtwfreenetREMOVEcouk at 216.196.109.145>,
Rob Williscroft  <rtw at freenet.co.uk> wrote:
>
>db.execute( '''
>    	update "sessions" set "uid" = ?
>    	where "uid" = ? 
>    	and exists(
>    	    	select * from "users" where "uid" = ?
>    	  )
>    ''',
>    (v['uid'],s.SID, v['uid']) 
>  )

This will be more efficient if you do "select uid from users".
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From jenn.duerr at gmail.com  Mon May 11 23:06:43 2009
From: jenn.duerr at gmail.com (noydb)
Date: Mon, 11 May 2009 20:06:43 -0700 (PDT)
Subject: putting date strings in order
Message-ID: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>

All,

How best to go about this?  >>

I have a list containing strings referring to months, like ["x_apr",
"x_jul", "x_jan", "x_aug", "x_may", etc] -- always using the 3-chars
for month.  The list will contain all 12 months, however the starting
month may not necessarily be jan.  I want to order the list
chronologically, but starting with the user-defined starting month.
So a list could be [x_aug, x_sep, .... x_jul].  The list might just
start off in any random order, but I need to ensure, in the end, that
the list is in chronological order and starting with the proper month
per user needs.

Anyone have any good ideas?  I was curious to see what people came up
with.


From wuwei23 at gmail.com  Mon May 11 23:13:02 2009
From: wuwei23 at gmail.com (alex23)
Date: Mon, 11 May 2009 20:13:02 -0700 (PDT)
Subject: OOP & Abstract Classes
References: <SZWNl.16133$hX2.2435@newsfe19.iad>
	<74c79941-af9b-4b43-b02b-8316b108f08d@l28g2000vba.googlegroups.com>
Message-ID: <83d2209a-8540-4cbb-8766-64d86b350314@c18g2000prh.googlegroups.com>

On May 12, 1:22?am, Mike Driscoll <kyoso... at gmail.com> wrote:
> I've never used (or heard of) the Abstract type...and the guy who
> wrote the FAQ was being a jerk. It looks like he was just throwing in
> an undefined variable name just to make his Python program break while
> taking a pot shot at people who use that sort of thing. Whatever.

The IAQ's entry on Abstract classes predates the introduction of
Abstract Base Classes to Python 2.6/3.0. Rather than being a "jerk",
the example shows how to produce similar behaviour without code AS
WELL as demonstrating a more extended approach. (You're not breaking
your program if the behaviour is intentional...)

> Hopefully someone who has used Abstract classes will jump in here and
> give you more information about whether or not they matter in Python.

Abstract classes are one mechanism for defining interfaces, but as
we've covered it's not the only approach that can be taken. I've
always been happy defining abstract methods using 'raise
NotImplementedError', but clearly the ABC approach is perceived as
having value otherwise it would never have been introduced into
2.6/3.0.


From yahoo at al-got-rhythm.net  Mon May 11 23:15:50 2009
From: yahoo at al-got-rhythm.net (Alan Brogan)
Date: Tue, 12 May 2009 04:15:50 +0100
Subject: Can I get a value's name
In-Reply-To: <4A08785A.6070906@seehart.com>
References: <gu9jqb+q7rk@eGroups.com> <4A08785A.6070906@seehart.com>
Message-ID: <12a6d6600905112015u174d4c4fg703913e4b1d220fd@mail.gmail.com>

Thank you Ken for your help answer

On Mon, May 11, 2009 at 8:11 PM, Ken Seehart <ken at seehart.com> wrote:
> jalanb3 wrote:
>>
<snip>
>> def replace_line(pattern,replacement):
>> ? ?values = '\n' in pattern and [ pattern ] or []
>> ? ?values += '\n' in replacement and [ replacement ] or []
>>
>> Can I later get the name "pattern" via values[0]?
>>
<snip>

> ?A value generally does not contain the
> "pattern" or any kind of name information (although class, method, and
> function instances contain some symbolic information in them).
>
That's why I took the question seriously at all:
     It was an entirely different project - pulling info out of
tracebacks into logs.
    And I can get names from a reference for classes, modules, ...
        Why not variables ?

> Study the concept of 'references' and all of this will become more clear.

I shall dive into that koan :-)

> The only way to do something like what you want would be to search globals()
> or locals() for the value (depending on the context), but that would be an
> extremely ugly hack.
Agreed

> Chances are that if you want to do this, you need to
> rethink the problem instead.
>
That does seem reasonable, but before I started writing Python it
would never occurred to me to add some attributes on to an object
whose definition I've never seen. So - unlikely, but I wouldn't rule
it out.

<snip>

> Note that a value can have several different names (and unnamed references)
> pointing at it,

Ah - there's  the rub !

All it takes (from my earlier example) is
    fred = pattern
    values += [ fred ]

Now which is "the real name" of values[0]?
In my example I would have wanted "pattern", and now whatever ugly
hack we used to get at "the name" is turning into an complex module.

> so the above code is not very general, but it may illustrate
> some interesting points.

Thanks - it does indeed.

> My guess is that your entire approach may need rethinking. ?What is the
> ultimate objective of your project?

Find out what some other Pythonista have thought about this problem

OTOH: the actual objective was to remove the redundancy of using the
string "pattern" when I already have a perfectly good eponymous
variable.  On balance I think allowing a little bit of redundancy is
prudent in this case :-)


From Gforrest.yang at gmail.com  Mon May 11 23:28:13 2009
From: Gforrest.yang at gmail.com (forrest yang)
Date: Mon, 11 May 2009 20:28:13 -0700 (PDT)
Subject: dict would be very slow for big data
Message-ID: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>

hi
i am trying to insert a lot of data into a dict, which may be
10,000,000 level.
after inserting 100000 unit, the insert rate become very slow, 50,000/
s, and the entire time used for this task would be very long,also.
would anyone know some solution for this case?

thanks


From http  Mon May 11 23:30:17 2009
From: http (Paul Rubin)
Date: 11 May 2009 20:30:17 -0700
Subject: putting date strings in order
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>
Message-ID: <7x8wl3c81i.fsf@ruckus.brouhaha.com>

noydb <jenn.duerr at gmail.com> writes:
> Anyone have any good ideas?  I was curious to see what people came up
> with.

Is this a homework assignment?  Some hints:

1) figure out how to compare two month names for chronological order,
   leaving out the issue of the starting month not being january.
2) figure out how to adjust for the starting month.  The exact
   semantics of the "%" operator might help do this concisely.


From kai.diefenbach at googlemail.com  Mon May 11 23:35:04 2009
From: kai.diefenbach at googlemail.com (Kai Diefenbach)
Date: Mon, 11 May 2009 20:35:04 -0700 (PDT)
Subject: ANN: Demo online shop for LFS
Message-ID: <9f40e0d7-d1f2-474b-89b5-7ec8dd14b78d@z5g2000vba.googlegroups.com>

Hi,

I'm pleased to announce that there is new demo shop for LFS:
http://demo.getlfs.com

LFS is an online shop based on Django and distributed  under the BSD-
License

For more information please visit http://www.getlfs.com, subscribe to
our feed http://www.getlfs.com/feeds/news or follow us on Twitter
http://twitter.com/lfsproject.

Thanks
K?i


From showell30 at yahoo.com  Tue May 12 00:07:44 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 11 May 2009 21:07:44 -0700 (PDT)
Subject: dict would be very slow for big data
References: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>
Message-ID: <7d5e78ae-2ef8-4260-b389-4660d6aff139@t10g2000vbg.googlegroups.com>

On May 11, 8:28?pm, forrest yang <Gforrest.y... at gmail.com> wrote:
> hi
> i am trying to insert a lot of data into a dict, which may be
> 10,000,000 level.
> after inserting 100000 unit, the insert rate become very slow, 50,000/
> s, and the entire time used for this task would be very long,also.
> would anyone know some solution for this case?
>

Are you running out of memory?  What are your keys?  Are you able to
gather any more specific data about the slowdown--do all operations
slow down equally or are there spurts of slowness?



From gagsl-py2 at yahoo.com.ar  Tue May 12 00:14:43 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 12 May 2009 01:14:43 -0300
Subject: web access through vpn client
References: <0aa2beb9-b2b1-4bba-b130-e88821b914e8@d19g2000prh.googlegroups.com>
	<7a9c25c20905011741m6b5d4360yf32acdf99238a685@mail.gmail.com>
Message-ID: <op.utst2t13x6zn5v@lepton.softlabbsas.com.ar>

En Fri, 01 May 2009 21:41:03 -0300, Stephen Hansen <apt.shansen at gmail.com>  
escribi?:

>> urllib2 and BeautifulSoup work pretty well to do what I want, and the
>> first little routine actually gets the data from the web page...
>> except if my VPN client is turned on.
>
> Usually when something like that happens with a VPN its because the VPN  
> has been configured to do so. Its the default usually and is a security
> precaution.  The exact wording of the option varies from VPN client to  
> VPN client; and its usually hidden deep in 'advanced'. E.g., on the mac 
> its "Send all traffic over VPN connection", on Windows I /believe/ its  
> something like "Set as default gateway" but its been awhile since I had 
> to tweak my windows install. No idea what it looks like on the Cisco 
> client.

Reading c.l.p. helps even for non-Python questions! A friend of mine had a  
problem with a VPN, I vaguely remembered this post and looked for it, and  
in a few minutes we fixed the problem. Thanks!

-- 
Gabriel Genellina



From david.lyon at preisshare.net  Tue May 12 00:16:58 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 12 May 2009 00:16:58 -0400
Subject: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <445Ol.724$5F2.395@nwrddc01.gnilink.net>
References: <445Ol.724$5F2.395@nwrddc01.gnilink.net>
Message-ID: <7dc7b3785ee4e6817b7b1b1946e1e41c@preisshare.net>


Hi,

hmmm... that's annoying..

Whilst I don't have an exact answer I have a few hunches...

Perphaps what has happened is that the windows installer between
the versions of pywin32 has installed newer versions of the same
dlls over the top of older ones.

Or, possibly, the installer hasn't wanted to replace older dll's 
because they already exist on the system.

This would result in a mismatch.

You may be lucky and find an install log. This might tell you which
files were actually installed. And you could play around with
moving them around.

Good luck with your night vision task....

David


On Tue, 12 May 2009 02:22:56 GMT, David Lees <debl2NoSpam at verizon.net>
wrote:
> I have no problem installing Python 2.6.2 for windows under XP SP3 and 
> IDLE and the command line versions work fine.  When I run the pywin32 
> installer downloaded from sourceforge (pywin32-212.win32-py2.6.exe) I 
> get the following error message:
> 
> Traceback (most recent call last):
>    File "<string>", line 565, in <module>
>    File "<string>", line 291, in install
> ImportError: Module use of python25.dll conflicts with this version of 
> Python.
> *** run_installscript: internal error 0xFFFFFFFF ***
> 
> I have tried uninstalling Python 2.6 and reinstalling, but still get the 
> same message.  I do have Python 2.5.4 and its associated Pywin32 on the 
> same machine, but I have a laptop with pywin32 installed for both python 
> 2.5 and 2.6.
> 
> TIA
> 
> David Lees


From david.lyon at preisshare.net  Tue May 12 00:18:28 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 12 May 2009 00:18:28 -0400
Subject: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <445Ol.724$5F2.395@nwrddc01.gnilink.net>
References: <445Ol.724$5F2.395@nwrddc01.gnilink.net>
Message-ID: <974a7ad00eec34e80f30a544643cc5d9@preisshare.net>

On Tue, 12 May 2009 02:22:56 GMT, David Lees <debl2NoSpam at verizon.net>
wrote:
> I have no problem installing Python 2.6.2 for windows under XP SP3 and 
> IDLE and the command line versions work fine.  When I run the pywin32 
> installer downloaded from sourceforge (pywin32-212.win32-py2.6.exe) I 
> get the following error message:
> 
> Traceback (most recent call last):
>    File "<string>", line 565, in <module>
>    File "<string>", line 291, in install
> ImportError: Module use of python25.dll conflicts with this version of 
> Python.
> *** run_installscript: internal error 0xFFFFFFFF ***
> 
> I have tried uninstalling Python 2.6 and reinstalling, but still get the 
> same message.  I do have Python 2.5.4 and its associated Pywin32 on the 
> same machine, but I have a laptop with pywin32 installed for both python 
> 2.5 and 2.6.
> 
> TIA
> 
> David Lees


From showell30 at yahoo.com  Tue May 12 00:49:51 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 11 May 2009 21:49:51 -0700 (PDT)
Subject: piping input to an external script
References: <gu9pbe$csc$1@foggy.unx.sas.com>
Message-ID: <73b5bc5d-df66-465c-819d-aa8758afe110@z7g2000vbh.googlegroups.com>

On May 11, 11:04?am, "Tim Arnold" <tim.arn... at sas.com> wrote:
> Hi, I have some html files that I want to validate by using an external
> script 'validate'. The html files need a doctype header attached before
> validation. The files are in utf8 encoding. My code:
> ---------------
> import os,sys
> import codecs,subprocess
> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
>
> filename ?= 'mytest.html'
> fd = codecs.open(filename,'rb',encoding='utf8')
> s = HEADER + fd.read()
> fd.close()
>
> p = subprocess.Popen(['validate'],
> ? ? ? ? ? ? ? ? ? ? stdin=subprocess.PIPE,
> ? ? ? ? ? ? ? ? ? ? stdout=subprocess.PIPE,
> ? ? ? ? ? ? ? ? ? ? stderr=subprocess.STDOUT)
> validate = p.communicate(unicode(s,encoding='utf8'))
> print validate
> ---------------
>
> I get lots of lines like this:
> Error at line 1, character 66:\tillegal character number 0
> etc etc.
>
> But I can give the command in a terminal 'cat mytest.html | validate' and
> get reasonable output. My subprocess code must be wrong, but I could use
> some help to see what the problem is.
>

Newline missing after the header is my guess.


From kay at fiber-space.de  Tue May 12 00:54:33 2009
From: kay at fiber-space.de (kay at fiber-space.de)
Date: Mon, 11 May 2009 21:54:33 -0700 (PDT)
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.5390.1241977162.11746.python-list@python.org> 
	<d201b2cb-4b13-4970-a44b-9be1b553e293@j12g2000vbl.googlegroups.com> 
	<Pine.LNX.4.64.0905120140001.2367@tau.ceti.pl>
Message-ID: <f8dfc0a0-8f8e-4f54-ab45-2ae4e5e60bfe@t11g2000vbc.googlegroups.com>

On 12 Mai, 02:10, Tomasz Rola <rto... at ceti.com.pl> wrote:
> On Mon, 11 May 2009, rump... at web.de wrote:
> > > One question I ask myself upon seeing a new language is if it is possible
> > > to program amb (amb=ambiguous) operator in it. This page gives a very
> > > nice, "code first" explanation of amb and how it is supposed to work:
>
> > >http://www.randomhacks.net/articles/2005/10/11/amb-operator
>
> > Hm. I am not sure either. To me, it looks like a constraint solver by
> > using brute force.
>
> Yes, kind of. From what I understand [1], it's goal is to simulate
> nondeterministic "get right answer in one try", only this "one try"
> requires browsing the solution space (because we have only "classic"
> hardware). It is easy to use amb in wrong way, but I can see some cases
> when I would like it.

In Python you can use a generator expression. Dan Piponis example can
be stated as

g = ((i,j) for i in range(2,100) for j in range(2,i) if i*j == 481)

which doesn't require any call/cc hacks but is a deterministic "get
right in one try". Once Nimrod has coroutines it's just a matter of
sugaring them into comprehensions.

>
> [1] John McCarthy's paper still waits to be read by me, so... Ok, I have
> just had a look at it and it seems that Ruby implementation is a bit
> primitive compared to original concept. But still, this is what would be
> needed in most real life cases, I suppose.
>
> I think ability to define amb would allow me to write more concise code.
> As far as I can tell, this kind of stuff plays more and more important
> role in my programing.
>
> > It seems to require continuations. AFAIK
> > continuations are extremely hard to implement efficiently, so probably
> > it won't be done in Nimrod.
>
> Pity, a little. But not really big problem for me. Nimrod may be
> interesting anyway, time will tell :-).
>
> Regards,
> Tomasz Rola
>
> --
> ** A C programmer asked whether computer had Buddha's nature.      **
> ** As the answer, master did "rm -rif" on the programmer's home    **
> ** directory. And then the C programmer became enlightened...      **
> **                                                                 **
> ** Tomasz Rola          mailto:tomasz_r... at bigfoot.com             **



From david.lyon at preisshare.net  Tue May 12 01:13:25 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 12 May 2009 01:13:25 -0400
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
Message-ID: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>

Hi,

hmmm... that's annoying..

Whilst I don't have an exact answer I have a few hunches...

Perphaps what has happened is that the windows installer between
the versions of pywin32 has installed newer versions of the same
dlls over the top of older ones.

Or, possibly, the installer hasn't wanted to replace older dll's 
because they already exist on the system.

This would result in a mismatch.

You may be lucky and find an install log. This might tell you which
files were actually installed. And you could play around with
moving them around.

Good luck with your night vision task....

David


On Tue, 12 May 2009 02:22:56 GMT, David Lees <debl2NoSpam at verizon.net>
wrote:
> I have no problem installing Python 2.6.2 for windows under XP SP3 and 
> IDLE and the command line versions work fine.  When I run the pywin32 
> installer downloaded from sourceforge (pywin32-212.win32-py2.6.exe) I 
> get the following error message:
> 
> Traceback (most recent call last):
>    File "<string>", line 565, in <module>
>    File "<string>", line 291, in install
> ImportError: Module use of python25.dll conflicts with this version of 
> Python.
> *** run_installscript: internal error 0xFFFFFFFF ***
> 
> I have tried uninstalling Python 2.6 and reinstalling, but still get the 
> same message.  I do have Python 2.5.4 and its associated Pywin32 on the 
> same machine, but I have a laptop with pywin32 installed for both python 
> 2.5 and 2.6.
> 
> TIA
> 
> David Lees


From norseman at hughes.net  Tue May 12 01:16:48 2009
From: norseman at hughes.net (norseman)
Date: Mon, 11 May 2009 22:16:48 -0700
Subject: piping input to an external script
In-Reply-To: <gu9pbe$csc$1@foggy.unx.sas.com>
References: <gu9pbe$csc$1@foggy.unx.sas.com>
Message-ID: <4A090640.8000303@hughes.net>

Tim Arnold wrote:
> Hi, I have some html files that I want to validate by using an external 
> script 'validate'. The html files need a doctype header attached before 
> validation. The files are in utf8 encoding. My code:
> ---------------
> import os,sys
> import codecs,subprocess
> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
> 
> filename  = 'mytest.html'
> fd = codecs.open(filename,'rb',encoding='utf8')
> s = HEADER + fd.read()
> fd.close()
> 
> p = subprocess.Popen(['validate'],
>                     stdin=subprocess.PIPE,
>                     stdout=subprocess.PIPE,
>                     stderr=subprocess.STDOUT)
> validate = p.communicate(unicode(s,encoding='utf8'))
> print validate
> ---------------
> 
> I get lots of lines like this:
> Error at line 1, character 66:\tillegal character number 0
> etc etc.
> 
> But I can give the command in a terminal 'cat mytest.html | validate' and 
> get reasonable output. My subprocess code must be wrong, but I could use 
> some help to see what the problem is.
> 
> python2.5.1, freebsd6
> thanks,
> --Tim
> 
> 
============================
If you search through the recent Python-List for UTF-8 things you might 
get the same understanding I have come to.

the problem is the use of python's 'print' subcommand or what ever it 
is. It 'cooks' things and someone decided that it would only handle 1/2 
of a byte (in the x'00 to x'7f' range) and ignore or send error messages 
against anything else. I guess the person doing the deciding read the 
part that says ASCII printables are in the 7 bit range and chose to 
ignore the part about the rest of the byte being undefined. That is 
undefined, not disallowed.  Means the high bit half can be used as 
wanted since it isn't already taken. Nor did whoever it was take a look 
around the computer world and realize the conflict that was going to be 
generated by using only 1/2 of a byte in a 1byte+ world.

If you can modify your code to use read and write you can bypass print 
and be OK.  Or just have python do the 'cat mytest.html | validate' for 
you. (Apply a var for html and let python accomplish the the equivalent 
of Unix's:
    for f in *.html; do cat $f | validate; done
                         or
     for f in *.html; do validate $f; done  #file name available this way

If you still have problems, take a look at os.POPEN2 (and its popen3)
Also take look at os.spawn.. et al

HTH

Steve


From showell30 at yahoo.com  Tue May 12 01:50:02 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 11 May 2009 22:50:02 -0700 (PDT)
Subject: piping input to an external script
References: <gu9pbe$csc$1@foggy.unx.sas.com>
	<mailman.21.1242105403.8015.python-list@python.org>
Message-ID: <81e57098-b61e-4e8b-826c-833518c8115e@r3g2000vbp.googlegroups.com>

On May 11, 10:16?pm, norseman <norse... at hughes.net> wrote:
> Tim Arnold wrote:
> > Hi, I have some html files that I want to validate by using an external
> > script 'validate'. The html files need a doctype header attached before
> > validation. The files are in utf8 encoding. My code:
> > ---------------
> > import os,sys
> > import codecs,subprocess
> > HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
>
> > filename ?= 'mytest.html'
> > fd = codecs.open(filename,'rb',encoding='utf8')
> > s = HEADER + fd.read()
> > fd.close()
>
> > p = subprocess.Popen(['validate'],
> > ? ? ? ? ? ? ? ? ? ? stdin=subprocess.PIPE,
> > ? ? ? ? ? ? ? ? ? ? stdout=subprocess.PIPE,
> > ? ? ? ? ? ? ? ? ? ? stderr=subprocess.STDOUT)
> > validate = p.communicate(unicode(s,encoding='utf8'))
> > print validate
> > ---------------
>
> > I get lots of lines like this:
> > Error at line 1, character 66:\tillegal character number 0
> > etc etc.
>
> > But I can give the command in a terminal 'cat mytest.html | validate' and
> > get reasonable output. My subprocess code must be wrong, but I could use
> > some help to see what the problem is.
>
> > python2.5.1, freebsd6
> > thanks,
> > --Tim
>
> ============================
> If you search through the recent Python-List for UTF-8 things you might
> get the same understanding I have come to.
>
> the problem is the use of python's 'print' subcommand or what ever it
> is. It 'cooks' things and someone decided that it would only handle 1/2
> of a byte (in the x'00 to x'7f' range) and ignore or send error messages
> against anything else. I guess the person doing the deciding read the
> part that says ASCII printables are in the 7 bit range and chose to
> ignore the part about the rest of the byte being undefined. That is
> undefined, not disallowed. ?Means the high bit half can be used as
> wanted since it isn't already taken. Nor did whoever it was take a look
> around the computer world and realize the conflict that was going to be
> generated by using only 1/2 of a byte in a 1byte+ world.
>
> If you can modify your code to use read and write you can bypass print
> and be OK. ?Or just have python do the 'cat mytest.html | validate' for
> you. (Apply a var for html and let python accomplish the the equivalent
> of Unix's:
> ? ? for f in *.html; do cat $f | validate; done
> ? ? ? ? ? ? ? ? ? ? ? ? ?or
> ? ? ?for f in *.html; do validate $f; done ?#file name available this way
>
> If you still have problems, take a look at os.POPEN2 (and its popen3)
> Also take look at os.spawn.. et al
>

Wow.  Unicode and subprocessing and printing can have dark corners,
but common sense does apply in MOST situations.

If you send the header, add the newline.

But you do not need the header if you can cat the input file sans
header and get sensible input.

Finally, if you are concerned about adding the header, then it belongs
in the original input file; otherwise, you are creating a false
positive.


From skippy.hammond at gmail.com  Tue May 12 02:00:34 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Tue, 12 May 2009 16:00:34 +1000
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>
Message-ID: <4A091082.8090004@gmail.com>

Probably some import statement is finding a .pyd module built against 
Python 2.5 instead of Python 2.6; it might be that PYTHONPATH points 
somewhere wrong, or the registry for Python 2.6 is setup wrong, or 
something else entirely...

Cheers,

Mark

On 12/05/2009 3:13 PM, David Lyon wrote:
> Hi,
>
> hmmm... that's annoying..
>
> Whilst I don't have an exact answer I have a few hunches...
>
> Perphaps what has happened is that the windows installer between
> the versions of pywin32 has installed newer versions of the same
> dlls over the top of older ones.
>
> Or, possibly, the installer hasn't wanted to replace older dll's
> because they already exist on the system.
>
> This would result in a mismatch.
>
> You may be lucky and find an install log. This might tell you which
> files were actually installed. And you could play around with
> moving them around.
>
> Good luck with your night vision task....
>
> David
>
>
> On Tue, 12 May 2009 02:22:56 GMT, David Lees<debl2NoSpam at verizon.net>
> wrote:
>> I have no problem installing Python 2.6.2 for windows under XP SP3 and
>> IDLE and the command line versions work fine.  When I run the pywin32
>> installer downloaded from sourceforge (pywin32-212.win32-py2.6.exe) I
>> get the following error message:
>>
>> Traceback (most recent call last):
>>     File "<string>", line 565, in<module>
>>     File "<string>", line 291, in install
>> ImportError: Module use of python25.dll conflicts with this version of
>> Python.
>> *** run_installscript: internal error 0xFFFFFFFF ***
>>
>> I have tried uninstalling Python 2.6 and reinstalling, but still get the
>> same message.  I do have Python 2.5.4 and its associated Pywin32 on the
>> same machine, but I have a laptop with pywin32 installed for both python
>> 2.5 and 2.6.
>>
>> TIA
>>
>> David Lees



From norseman at hughes.net  Tue May 12 02:31:45 2009
From: norseman at hughes.net (norseman)
Date: Mon, 11 May 2009 23:31:45 -0700
Subject: piping input to an external script
In-Reply-To: <81e57098-b61e-4e8b-826c-833518c8115e@r3g2000vbp.googlegroups.com>
References: <gu9pbe$csc$1@foggy.unx.sas.com>	<mailman.21.1242105403.8015.python-list@python.org>
	<81e57098-b61e-4e8b-826c-833518c8115e@r3g2000vbp.googlegroups.com>
Message-ID: <4A0917D1.7020903@hughes.net>

Steve Howell wrote:
> On May 11, 10:16 pm, norseman <norse... at hughes.net> wrote:
>> Tim Arnold wrote:
>>> Hi, I have some html files that I want to validate by using an external
>>> script 'validate'. The html files need a doctype header attached before
>>> validation. The files are in utf8 encoding. My code:
>>> ---------------
>>> import os,sys
>>> import codecs,subprocess
>>> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
>>> filename  = 'mytest.html'
>>> fd = codecs.open(filename,'rb',encoding='utf8')
>>> s = HEADER + fd.read()
>>> fd.close()
>>> p = subprocess.Popen(['validate'],
>>>                     stdin=subprocess.PIPE,
>>>                     stdout=subprocess.PIPE,
>>>                     stderr=subprocess.STDOUT)
>>> validate = p.communicate(unicode(s,encoding='utf8'))
>>> print validate
>>> ---------------
>>> I get lots of lines like this:
>>> Error at line 1, character 66:\tillegal character number 0
>>> etc etc.
>>> But I can give the command in a terminal 'cat mytest.html | validate' and
>>> get reasonable output. My subprocess code must be wrong, but I could use
>>> some help to see what the problem is.
>>> python2.5.1, freebsd6
>>> thanks,
>>> --Tim
>> ============================
>> If you search through the recent Python-List for UTF-8 things you might
>> get the same understanding I have come to.
>>
>> the problem is the use of python's 'print' subcommand or what ever it
>> is. It 'cooks' things and someone decided that it would only handle 1/2
>> of a byte (in the x'00 to x'7f' range) and ignore or send error messages
>> against anything else. I guess the person doing the deciding read the
>> part that says ASCII printables are in the 7 bit range and chose to
>> ignore the part about the rest of the byte being undefined. That is
>> undefined, not disallowed.  Means the high bit half can be used as
>> wanted since it isn't already taken. Nor did whoever it was take a look
>> around the computer world and realize the conflict that was going to be
>> generated by using only 1/2 of a byte in a 1byte+ world.
>>
>> If you can modify your code to use read and write you can bypass print
>> and be OK.  Or just have python do the 'cat mytest.html | validate' for
>> you. (Apply a var for html and let python accomplish the the equivalent
>> of Unix's:
>>     for f in *.html; do cat $f | validate; done
>>                          or
>>      for f in *.html; do validate $f; done  #file name available this way
>>
>> If you still have problems, take a look at os.POPEN2 (and its popen3)
>> Also take look at os.spawn.. et al
>>
> 
> Wow.  Unicode and subprocessing and printing can have dark corners,
> but common sense does apply in MOST situations.
> 
> If you send the header, add the newline.
> 
> But you do not need the header if you can cat the input file sans
> header and get sensible input.
> 

Yep!  The problem is with 'print'

> Finally, if you are concerned about adding the header, then it belongs
> in the original input file; otherwise, you are creating a false
> positive.


Steve


From ggardiner at iee.org  Tue May 12 02:36:57 2009
From: ggardiner at iee.org (Geoff Gardiner)
Date: Tue, 12 May 2009 07:36:57 +0100
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
In-Reply-To: <guagq9$361$1@lust.ihug.co.nz>
References: <mailman.5282.1241783298.11746.python-list@python.org>	<gu6i38$jhk$1@panix3.panix.com>	<mailman.5375.1241962005.11746.python-list@python.org>	<gu9fr2$je5$1@panix3.panix.com>	<mailman.5.1242076536.8015.python-list@python.org>
	<guagq9$361$1@lust.ihug.co.nz>
Message-ID: <4A091909.4070108@iee.org>

Lawrence D'Oliveiro wrote:
> .. I expect an apology. 
> Otherwise, it becomes grounds for an abuse complaint to your ISP.
>   
Yes, I do apologize profusely and publicly, and would have done so
regardless of threat.

I had trouble with posts making it through to the list and so was also
posting in parallel to the original posters. In doing so, your address
initially bounced the message - so I changed it unthinkingly in a to: line.

I did not realize until this morning that they made it through
python-list unchanged, as they obviously do.

All the best,
Geoff




From ralf321 at gmx.de  Tue May 12 02:48:49 2009
From: ralf321 at gmx.de (ralf321 at gmx.de)
Date: Mon, 11 May 2009 23:48:49 -0700 (PDT)
Subject: install pyPgSQL on Windows for python 2.5
References: <4e9538ae-15b3-4214-b3d7-ebf948bf2f17@r33g2000yqn.googlegroups.com>
	<72se78Frtj4nU1@mid.individual.net>
	<fc2d1dbe-c1f2-4d41-8984-e5979cd8b6b6@v15g2000yqn.googlegroups.com>
Message-ID: <912b822c-e6ac-4e2f-bddf-8c422c7e8bab@r34g2000vbi.googlegroups.com>

On 24 Mrz., 18:25, someon <petshm... at googlemail.com> wrote:
> On Mar 24, 4:57?pm, Dietmar Schwertberger <n... at schwertberger.de>
> wrote:
>
> > someone wrote:
> > > Hi,
>
> > > does anyone know how to install pyPgSQL on Windows? There is no
> > > package for Python 2.5 on Homepage:
> > > I've installed newest Visual C++ Studio 2008 from Microsoft, but still
> > > no luck
>
> > Hello Pet,
>
> > you need Visual Studio 2003 to compile extensions for Python 2.5
> > If you want, I can send you a binary.
>
> O, thank you very much!
> Where should I put hole thing?
>
> > Regards,
>
> > Dietmar
>
>

Hello,
i need the binary files too.
can you send me or upload anywhere?
thanks.

regards
Ralf


From showell30 at yahoo.com  Tue May 12 02:50:23 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 11 May 2009 23:50:23 -0700 (PDT)
Subject: piping input to an external script
References: <gu9pbe$csc$1@foggy.unx.sas.com>
	<mailman.21.1242105403.8015.python-list@python.org> 
	<81e57098-b61e-4e8b-826c-833518c8115e@r3g2000vbp.googlegroups.com> 
	<mailman.23.1242109891.8015.python-list@python.org>
Message-ID: <e301dce1-fe8c-4089-aa51-97a3ded310a7@n4g2000vba.googlegroups.com>

On May 11, 11:31?pm, norseman <norse... at hughes.net> wrote:
> Steve Howell wrote:
> > On May 11, 10:16 pm, norseman <norse... at hughes.net> wrote:
> >> Tim Arnold wrote:
> >>> Hi, I have some html files that I want to validate by using an external
> >>> script 'validate'. The html files need a doctype header attached before
> >>> validation. The files are in utf8 encoding. My code:
> >>> ---------------
> >>> import os,sys
> >>> import codecs,subprocess
> >>> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
> >>> filename ?= 'mytest.html'
> >>> fd = codecs.open(filename,'rb',encoding='utf8')
> >>> s = HEADER + fd.read()
> >>> fd.close()
> >>> p = subprocess.Popen(['validate'],
> >>> ? ? ? ? ? ? ? ? ? ? stdin=subprocess.PIPE,
> >>> ? ? ? ? ? ? ? ? ? ? stdout=subprocess.PIPE,
> >>> ? ? ? ? ? ? ? ? ? ? stderr=subprocess.STDOUT)
> >>> validate = p.communicate(unicode(s,encoding='utf8'))
> >>> print validate
> >>> ---------------
> >>> I get lots of lines like this:
> >>> Error at line 1, character 66:\tillegal character number 0
> >>> etc etc.
> >>> But I can give the command in a terminal 'cat mytest.html | validate' and
> >>> get reasonable output. My subprocess code must be wrong, but I could use
> >>> some help to see what the problem is.
> >>> python2.5.1, freebsd6
> >>> thanks,
> >>> --Tim
> >> ============================
> >> If you search through the recent Python-List for UTF-8 things you might
> >> get the same understanding I have come to.
>
> >> the problem is the use of python's 'print' subcommand or what ever it
> >> is. It 'cooks' things and someone decided that it would only handle 1/2
> >> of a byte (in the x'00 to x'7f' range) and ignore or send error messages
> >> against anything else. I guess the person doing the deciding read the
> >> part that says ASCII printables are in the 7 bit range and chose to
> >> ignore the part about the rest of the byte being undefined. That is
> >> undefined, not disallowed. ?Means the high bit half can be used as
> >> wanted since it isn't already taken. Nor did whoever it was take a look
> >> around the computer world and realize the conflict that was going to be
> >> generated by using only 1/2 of a byte in a 1byte+ world.
>
> >> If you can modify your code to use read and write you can bypass print
> >> and be OK. ?Or just have python do the 'cat mytest.html | validate' for
> >> you. (Apply a var for html and let python accomplish the the equivalent
> >> of Unix's:
> >> ? ? for f in *.html; do cat $f | validate; done
> >> ? ? ? ? ? ? ? ? ? ? ? ? ?or
> >> ? ? ?for f in *.html; do validate $f; done ?#file name available this way
>
> >> If you still have problems, take a look at os.POPEN2 (and its popen3)
> >> Also take look at os.spawn.. et al
>
> > Wow. ?Unicode and subprocessing and printing can have dark corners,
> > but common sense does apply in MOST situations.
>
> > If you send the header, add the newline.
>
> > But you do not need the header if you can cat the input file sans
> > header and get sensible input.
>
> Yep! ?The problem is with 'print'
>

Huh?  Print is printing exactly what you expect it to print.



From mikael at isy.liu.se  Tue May 12 02:54:22 2009
From: mikael at isy.liu.se (Mikael Olofsson)
Date: Tue, 12 May 2009 08:54:22 +0200
Subject: Decorating methods - where do my arguments go?
In-Reply-To: <gu9jo6$9bk$01$1@news.t-online.com>
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
	<gu8u7s$l1$1@news.lysator.liu.se>
	<Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>
	<gu954t$29r$1@news.lysator.liu.se>
	<gu9jo6$9bk$01$1@news.t-online.com>
Message-ID: <guapa7$eri$1@news.lysator.liu.se>

Peter Otten wrote:
> I usually use decorator functions, but I think the following should work, 
> too:
> 
> class deco(object):
>     def __init__(self, func):
>         self._func = func
>     def __call__(self, *args):
>         print "Decorator:", args
>         self._func(*args)
>     def __get__(self, *args):
>         return deco(self._func.__get__(*args))

This looks like a winner to me. It is elegant, works for functions as 
well as for methods, and does not mess with the internals of the 
decorator which avoids the problems that Duncan pointed out.

Thanks Peter, and thanks everyone else that chimed in and contributed.

/MiO


From rtw at freenet.co.uk  Tue May 12 02:56:50 2009
From: rtw at freenet.co.uk (Rob Williscroft)
Date: Tue, 12 May 2009 01:56:50 -0500
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
	<guao50$1jv$1@panix3.panix.com>
Message-ID: <Xns9C09513903E8FrtwfreenetREMOVEcouk@216.196.109.145>

Aahz wrote in news:guao50$1jv$1 at panix3.panix.com in comp.lang.python:

> In article <Xns9C08E179B66D8rtwfreenetREMOVEcouk at 216.196.109.145>,
> Rob Williscroft  <rtw at freenet.co.uk> wrote:
>>
>>db.execute( '''
>>         update "sessions" set "uid" = ?
>>         where "uid" = ? 
>>         and exists(
>>                  select * from "users" where "uid" = ?
>>           )
>>    ''',
>>    (v['uid'],s.SID, v['uid']) 
>>  )
> 
> This will be more efficient if you do "select uid from users".

What will be more efficient ?

Do you mean the "select * ..." or do you want to take the exists 
sub-query out and put it in a python if ? 

Rob.
-- 
http://www.victim-prime.dsl.pipex.com/


From michele.simionato at gmail.com  Tue May 12 03:01:10 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Tue, 12 May 2009 00:01:10 -0700 (PDT)
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com> 
	<gu8u7s$l1$1@news.lysator.liu.se>
	<Xns9C08A5D9BCFA1duncanbooth@127.0.0.1> 
	<gu954t$29r$1@news.lysator.liu.se> <gu9jo6$9bk$01$1@news.t-online.com> 
	<guapa7$eri$1@news.lysator.liu.se>
Message-ID: <0601fa8d-00af-41fe-86f7-5bb210ec268c@o14g2000vbo.googlegroups.com>

On May 12, 8:54?am, Mikael Olofsson <mik... at isy.liu.se> wrote:
> Peter Otten wrote:
> > I usually use decorator functions, but I think the following should work,
> > too:
>
> > class deco(object):
> > ? ? def __init__(self, func):
> > ? ? ? ? self._func = func
> > ? ? def __call__(self, *args):
> > ? ? ? ? print "Decorator:", args
> > ? ? ? ? self._func(*args)
> > ? ? def __get__(self, *args):
> > ? ? ? ? return deco(self._func.__get__(*args))
>
> This looks like a winner to me. It is elegant, works for functions as
> well as for methods, and does not mess with the internals of the
> decorator which avoids the problems that Duncan pointed out.

Still it turns something which is a function into an object and you
lose the
docstring and the signature. pydoc will not be too happy with this
approach.


From deets at nospam.web.de  Tue May 12 03:09:46 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 12 May 2009 09:09:46 +0200
Subject: how to consume .NET webservice
In-Reply-To: <guaf4j$1fsn$1@adenine.netfront.net>
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net>
	<76rnq5F1dp6gpU1@mid.uni-berlin.de>
	<guaf4j$1fsn$1@adenine.netfront.net>
Message-ID: <76sllsF1eju82U1@mid.uni-berlin.de>

namekuseijin schrieb:
> Diez B. Roggisch wrote:
>> namekuseijin schrieb:
>>> bav escreveu:
>>>> question from a python newbie;
>>>>
>>>>   how can i consume in python language, a .NET web service, passing
>>>>   a string array as parameter in some easy steps?
>>>
>>> Unless Microsoft extended the standard in any way, then it should be 
>>> just as you consume any web service, I guess. ;)
>>
>> Microsoft *created* the standard.. 
> 
> No:


Yes:

http://webservices.xml.com/pub/a/ws/2001/04/04/soap.html

MS created it. That it *became* a standard of the W3C later - well, they 
did that with OOXML as well...

Diez


From deets at nospam.web.de  Tue May 12 03:12:21 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 12 May 2009 09:12:21 +0200
Subject: how to consume .NET webservice
In-Reply-To: <guaf4j$1fsn$1@adenine.netfront.net>
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net>
	<76rnq5F1dp6gpU1@mid.uni-berlin.de>
	<guaf4j$1fsn$1@adenine.netfront.net>
Message-ID: <76slqnF1ehacbU1@mid.uni-berlin.de>

namekuseijin schrieb:
 > Diez B. Roggisch wrote:
 >> namekuseijin schrieb:
 >>> bav escreveu:
 >>>> question from a python newbie;
 >>>>
 >>>>   how can i consume in python language, a .NET web service, passing
 >>>>   a string array as parameter in some easy steps?
 >>>
 >>> Unless Microsoft extended the standard in any way, then it should 
be just as you consume any web service, I guess. ;)
 >>
 >> Microsoft *created* the standard..
 >
 > No:


Yes:

http://webservices.xml.com/pub/a/ws/2001/04/04/soap.html

MS created it. That it *became* a standard of the W3C later - well, they 
did that with OOXML as well...

Diez


From deets at nospam.web.de  Tue May 12 03:14:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 12 May 2009 09:14:33 +0200
Subject: how to consume .NET webservice
In-Reply-To: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
Message-ID: <76sluqF1ehacbU2@mid.uni-berlin.de>

bav schrieb:
> question from a python newbie;
> 
>   how can i consume in python language, a .NET web service, passing
>   a string array as parameter in some easy steps?

Try accessing the .NET-service using a .NET client, and capture the 
traffic (it speaks volumes that the apache axis project offers a 
HTTP-proxy for exactly that purposes, tcpmon). Then use an 
XML-templating language such as genshi & create the messages yourself.

Sounds awkward and complicated? It is. As I said in another post: the 
"S" stands for simple...

Diez


From davea at ieee.org  Tue May 12 03:24:18 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 12 May 2009 03:24:18 -0400
Subject: piping input to an external script
In-Reply-To: <gu9pbe$csc$1@foggy.unx.sas.com>
References: <gu9pbe$csc$1@foggy.unx.sas.com>
Message-ID: <4A092422.50100@ieee.org>

Tim Arnold wrote:
> Hi, I have some html files that I want to validate by using an external 
> script 'validate'. The html files need a doctype header attached before 
> validation. The files are in utf8 encoding. My code:
> ---------------
> import os,sys
> import codecs,subprocess
> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
>
> filename  = 'mytest.html'
> fd = codecs.open(filename,'rb',encoding='utf8')
> s = HEADER + fd.read()
> fd.close()
>
> p = subprocess.Popen(['validate'],
>                     stdin=subprocess.PIPE,
>                     stdout=subprocess.PIPE,
>                     stderr=subprocess.STDOUT)
> validate = p.communicate(unicode(s,encoding='utf8'))
> print validate
> ---------------
>
> I get lots of lines like this:
> Error at line 1, character 66:\tillegal character number 0
> etc etc.
>
> But I can give the command in a terminal 'cat mytest.html | validate' and 
> get reasonable output. My subprocess code must be wrong, but I could use 
> some help to see what the problem is.
>
> python2.5.1, freebsd6
> thanks,
> --Tim
>
>
>
>   
The usual rule in debugging:  split the problem into two parts, and test 
each one separately, starting with the one you think most likely to be 
the culprit

In this case the obvious place to split is with the data you're passing 
to the  communicate call.  I expect it's already wrong, long before you 
hand it to the subprocess.  So write it to a file instead, and inspect 
it with a binary file viewer.  And of course test it manually with your 
validate program.  Is validate really expecting a Unicode stream in stdin ?




From mail at timgolden.me.uk  Tue May 12 03:26:37 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 12 May 2009 08:26:37 +0100
Subject: Complete frustration
In-Reply-To: <4A08C32D.3020904@ieee.org>
References: <db03ded2-18d7-41ce-9289-08e30873aeb0@s16g2000vbp.googlegroups.com>	<4A085B14.2060908@hughes.net>
	<4A08C32D.3020904@ieee.org>
Message-ID: <4A0924AD.3080201@timgolden.me.uk>

Dave Angel wrote:

[... snip sound advice about file associations etc. ...]

One thing to bear in mind is that any settings, however obtained,
in the User part of the registry (HKCU\Software\....) will override
those in the Machine part of the registry (HKLM\Software...). If
you think you've set things correctly and you're still not seeing
the effect, check under HKCU to see if there's something there
which would override things.

TJG


From tadwelessar at gmail.com  Tue May 12 04:15:48 2009
From: tadwelessar at gmail.com (Matteo)
Date: Tue, 12 May 2009 01:15:48 -0700 (PDT)
Subject: Fill Javascript form
References: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>
	<mailman.3.1242076014.8015.python-list@python.org>
Message-ID: <a91b7799-953e-4751-b18b-791b1a378794@l28g2000vba.googlegroups.com>

On 11 Mag, 23:06, Shawn Milochik <Sh... at Milochik.com> wrote:
> How is the form "written in JavaScript"? Is it dynamically generated?
>
> In any case, can you just send a POST request if you know the values required?

The problem is indeed that the form is dynamically generated.
That's the .js file:

if (navigator.appVersion.indexOf("MSIE")!=-1)
document.write("<script type='text/javascript' id='chillicontroller'></
script>");

if (!window.queryObj) {
    window.queryObj = new Object();
    window.location.search.replace(new RegExp("([^?=&]+)(=([^&]
*))?","g"), function($0,$1,$2,$3) { queryObj[$1] = $3; });
    if (queryObj['uamip'] == null && queryObj['uamport'] == null)
{queryObj['uamip']='10.192.0.1';queryObj['uamport']='3990';}
}

if (queryObj['uamip'] != null && queryObj['uamport'] != null) {
    var script = document.getElementById('chillicontroller');
    if (script == null) {
  // 	document.write('manutenzione');
	script = document.createElement('script');
	script.id = 'chillicontroller';
	script.type = 'text/javascript';
    	script.src = 'http://'+queryObj['uamip']+':3990/www/
chillijs.chi';

    	var head = document.getElementsByTagName("head")[0];
    	if (head == null) head = document.body;
	head.appendChild(script);
   }
   script=document.getElementById('chillicontroller');
   if(script==null)document.write('manutenzione');
    script.src = 'http://'+queryObj['uamip']+':3990/www/chillijs.chi';

} else {
//document.write('manutenzione');
    var noLocation = document.getElementById("noLocation");
    if (noLocation != null && noLocation.style) {
       noLocation.style.display = 'inline';
    }
}



From jeremiah.dodds at gmail.com  Tue May 12 04:18:51 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Tue, 12 May 2009 09:18:51 +0100
Subject: Your Favorite Python Book
In-Reply-To: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
Message-ID: <12cbbbfc0905120118s34c688f7tf30519b9e0d4a755@mail.gmail.com>

On Mon, May 11, 2009 at 9:44 PM, Sam Tregar <sam at tregar.com> wrote:

> Greetings.  I'm working on learning Python and I'm looking for good books
> to read.  I'm almost done with Dive into Python and I liked it a lot. I
> found Programming Python a little dry the last time I looked at it, but I'm
> more motivated now so I might return to it.  What's your favorite?  Why?
>
> -sam
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
I've gotten great use out of Programming Python (mainly because it has a lot
of larger full-fledged examples), Python in a Nutshell, and recently Expert
Python Programming. My copy of Python in a Nutshell is particularly
dog-eared now - it is a bit outdated (I've got notes all over the book of
things that have changed...) but it's still a great resource.
-------------- next part --------------
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From ldo at geek-central.gen.new_zealand  Tue May 12 04:23:25 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 20:23:25 +1200
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com>
Message-ID: <gubblt$igm$4@lust.ihug.co.nz>

In message <gu7f97$mt6$2 at reader1.panix.com>, kj wrote:

> I know about the construct:
> 
> try:
>     # do something
> except ...:
>     # handle exception
> else:
>     # do something else
> 
> ...but I can't come with an example in which the same couldn't be
> accomplished with [no else]

I'd agree. If you have to resort to a "try .. else", then might I 
respectfully suggest that you're using exceptions in a way that's 
complicated enough to get you into trouble.



From duncan.booth at invalid.invalid  Tue May 12 04:25:59 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 12 May 2009 08:25:59 GMT
Subject: Decorating methods - where do my arguments go?
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
	<gu8u7s$l1$1@news.lysator.liu.se>
	<Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>
	<gu954t$29r$1@news.lysator.liu.se>
	<gu9jo6$9bk$01$1@news.t-online.com>
	<guapa7$eri$1@news.lysator.liu.se>
	<0601fa8d-00af-41fe-86f7-5bb210ec268c@o14g2000vbo.googlegroups.com>
Message-ID: <Xns9C095F0E58B75duncanbooth@127.0.0.1>

Michele Simionato <michele.simionato at gmail.com> wrote:

> On May 12, 8:54?am, Mikael Olofsson <mik... at isy.liu.se> wrote:
>> Peter Otten wrote:
>> > I usually use decorator functions, but I think the following should
>> > wor 
> k,
>> > too:
>>
>> > class deco(object):
>> > ? ? def __init__(self, func):
>> > ? ? ? ? self._func = func
>> > ? ? def __call__(self, *args):
>> > ? ? ? ? print "Decorator:", args
>> > ? ? ? ? self._func(*args)
>> > ? ? def __get__(self, *args):
>> > ? ? ? ? return deco(self._func.__get__(*args))
>>
>> This looks like a winner to me. It is elegant, works for functions as
>> well as for methods, and does not mess with the internals of the
>> decorator which avoids the problems that Duncan pointed out.
> 
> Still it turns something which is a function into an object and you
> lose the
> docstring and the signature. pydoc will not be too happy with this
> approach.

Also it means every time the decorator is invoked 'self' references a 
new instance of deco. I don't know why Mikael wants to use a class 
rather than a function but if he wants to save state between calls this 
isn't going to help.

Something like this may work, and preserves the function name, type and 
docstring:

from functools import wraps
class Decorator(object):
    def __init__(self, func):
        self._func = func

    def __new__(cls, func):
        decorator = object.__new__(cls)
        decorator.__init__(func)
        @wraps(func)
        def wrapper(*args, **kwds):
            return decorator(*args, **kwds)
        return wrapper

class deco(Decorator):
    def __init__(self, func):
        self.calls = 0
        Decorator.__init__(self, func)
        
    def __call__(self, *args):
        self.calls += 1
        print "Decorator:", args, "called", self.calls, "times"
        return self._func(*args)

class C(object):
    @deco
    def meth(self, arg):
        """meth's docstring"""
        print "meth %r %r" % (self, arg)
        return arg+1

inst1 = C()
inst2 = C()
print repr(inst1.meth), inst1.meth.__doc__

print inst1.meth(5)
print inst1.meth(inst2.meth(3))

-------------------
Output:
<bound method C.meth of <__main__.C object at 0x00B45390>> meth's 
docstring
Decorator: (<__main__.C object at 0x00B45390>, 5) called 1 times
meth <__main__.C object at 0x00B45390> 5
6
Decorator: (<__main__.C object at 0x00B453D0>, 3) called 2 times
meth <__main__.C object at 0x00B453D0> 3
Decorator: (<__main__.C object at 0x00B45390>, 4) called 3 times
meth <__main__.C object at 0x00B45390> 4
5


-- 
Duncan Booth http://kupuguy.blogspot.com


From steven at REMOVE.THIS.cybersource.com.au  Tue May 12 04:31:09 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 May 2009 08:31:09 GMT
Subject: dict would be very slow for big data
References: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>
Message-ID: <pan.2009.05.12.08.31.09@REMOVE.THIS.cybersource.com.au>

On Mon, 11 May 2009 20:28:13 -0700, forrest yang wrote:

> hi
> i am trying to insert a lot of data into a dict, which may be 10,000,000
> level.
> after inserting 100000 unit, the insert rate become very slow, 50,000/
> s, and the entire time used for this task would be very long,also. would
> anyone know some solution for this case?

You don't give us enough information to answer.


How are you generating the data?

What are the keys and the values?

Are you sure it is slow to insert into the dict, or could some other part 
of your processing be slow?

Does performance change if you turn garbage collection off?

import gc
gc.disable()
# insert your items
gc.enable()


Can you show us a sample of the data, and the code you are using to 
insert it into the dict?

Do you have enough memory? If you run an external process like top, can 
you see memory exhaustion, CPU load or some other problem?




-- 
Steven


From jeremiah.dodds at gmail.com  Tue May 12 04:34:40 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Tue, 12 May 2009 09:34:40 +0100
Subject: Fill Javascript form
In-Reply-To: <a91b7799-953e-4751-b18b-791b1a378794@l28g2000vba.googlegroups.com>
References: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>
	<mailman.3.1242076014.8015.python-list@python.org>
	<a91b7799-953e-4751-b18b-791b1a378794@l28g2000vba.googlegroups.com>
Message-ID: <12cbbbfc0905120134w301c3175x2f0a3256ede80d1e@mail.gmail.com>

On Tue, May 12, 2009 at 9:15 AM, Matteo <tadwelessar at gmail.com> wrote:

> On 11 Mag, 23:06, Shawn Milochik <Sh... at Milochik.com> wrote:
> > How is the form "written in JavaScript"? Is it dynamically generated?
> >
> > In any case, can you just send a POST request if you know the values
> required?
>
> The problem is indeed that the form is dynamically generated.
> That's the .js file:
>
> if (navigator.appVersion.indexOf("MSIE")!=-1)
> document.write("<script type='text/javascript' id='chillicontroller'></
> script>");
>
> if (!window.queryObj) {
>    window.queryObj = new Object();
>    window.location.search.replace(new RegExp("([^?=&]+)(=([^&]
> *))?","g"), function($0,$1,$2,$3) { queryObj[$1] = $3; });
>    if (queryObj['uamip'] == null && queryObj['uamport'] == null)
> {queryObj['uamip']='10.192.0.1';queryObj['uamport']='3990';}
> }
>
> if (queryObj['uamip'] != null && queryObj['uamport'] != null) {
>    var script = document.getElementById('chillicontroller');
>    if (script == null) {
>  //    document.write('manutenzione');
>        script = document.createElement('script');
>        script.id = 'chillicontroller';
>        script.type = 'text/javascript';
>        script.src = 'http://'+queryObj['uamip']+':3990/www/
> chillijs.chi';
>
>        var head = document.getElementsByTagName("head")[0];
>        if (head == null) head = document.body;
>        head.appendChild(script);
>   }
>   script=document.getElementById('chillicontroller');
>   if(script==null)document.write('manutenzione');
>    script.src = 'http://'+queryObj['uamip']+':3990/www/chillijs.chi';
>
> } else {
> //document.write('manutenzione');
>    var noLocation = document.getElementById("noLocation");
>    if (noLocation != null && noLocation.style) {
>       noLocation.style.display = 'inline';
>     }
> }
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


Use firebug or something similar (HTTPFox) to take a look at what you should
be sending as a post, and then just send that it your python script. Worst
case scenario is that you need to reverse-engineer a javascript-generated
session-id-type-thing, but that's pretty rare. Most likely, you don't even
need to grab the page.
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From bruno.42.desthuilliers at websiteburo.invalid  Tue May 12 04:35:42 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 12 May 2009 10:35:42 +0200
Subject: dict would be very slow for big data
In-Reply-To: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>
References: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>
Message-ID: <4a0934d8$0$11789$426a74cc@news.free.fr>

forrest yang a ?crit :
> hi
> i am trying to insert a lot of data into a dict, which may be
> 10,000,000 level.
> after inserting 100000 unit, the insert rate become very slow, 50,000/
> s, and the entire time used for this task would be very long,also.
> would anyone know some solution for this case?

Hint : computer's RAM is not an infinite resource.



From jason.heeris at gmail.com  Tue May 12 04:43:26 2009
From: jason.heeris at gmail.com (Jason)
Date: Tue, 12 May 2009 01:43:26 -0700 (PDT)
Subject: Is there a GUI for informing a user of missing dependencies?
Message-ID: <c84cea25-7c9f-40c8-aed3-5fe0d2e3a181@d19g2000prh.googlegroups.com>

I'm writing a small GUI (Python 2.5/6) using wxPython and pySerial.
Since these are both 3rd party modules, if a user doesn't have them
installed and tries to run the GUI from a file browser, the app will
fail silently. I'm hoping to avoid that.

Sure, I'll have a readme file, but I was wondering if there is an even
more direct way. I was going to roll my own (eg. very simple Tkinter
fallback error dialog if wxPython import fails, wxPython error dialog
if anything else is missing); but I was wondering if such a system
already exists out there.

? Jason


From ldo at geek-central.gen.new_zealand  Tue May 12 04:45:01 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 20:45:01 +1200
Subject: How do I test the integrity of a Python installation in Debian
	and Ubuntu
References: <mailman.5282.1241783298.11746.python-list@python.org>
	<gu6i38$jhk$1@panix3.panix.com>
	<mailman.5375.1241962005.11746.python-list@python.org>
	<gu9fr2$je5$1@panix3.panix.com>
	<mailman.5.1242076536.8015.python-list@python.org>
	<guagq9$361$1@lust.ihug.co.nz>
	<mailman.24.1242110221.8015.python-list@python.org>
Message-ID: <gubcud$jf9$1@lust.ihug.co.nz>

In message <mailman.24.1242110221.8015.python-list at python.org>, Geoff 
Gardiner wrote:

> Lawrence D'Oliveiro wrote:
>
>> .. I expect an apology.
>> Otherwise, it becomes grounds for an abuse complaint to your ISP.
>>   
> Yes, I do apologize profusely and publicly ...

Thank you.



From martin at librador.com  Tue May 12 04:57:34 2009
From: martin at librador.com (Martin Vilcans)
Date: Tue, 12 May 2009 10:57:34 +0200
Subject: Nimrod programming language
In-Reply-To: <159308160@web.de>
References: <159308160@web.de>
Message-ID: <f782707a0905120157q6dbcfa9am3075c4916459dbf9@mail.gmail.com>

On Fri, May 8, 2009 at 5:48 PM, Andreas Rumpf <Rumpf_A at web.de> wrote:
> Dear Python-users,
>
> I invented a new programming language called "Nimrod" that combines Python's readability with C's performance. Please check it out: http://force7.de/nimrod/
> Any feedback is appreciated.

Nice with a language with a new language designed for high
performance. It seems like a direct competitor with D, i.e. a
high-level language with low-level abilities. The Python-like syntax
is a good idea.

There are two showstoppers for me though:

1. Introducing a new programming language where the char type is a
byte is anachronistic. You're saying that programmers don't have to
care about the string encoding and can just treat them as an array of
bytes. That is exactly what causes all the problems with applications
that haven't been designed to handle anything but ASCII. If you're
doing any logic with strings except dumb reading and writing, you
typically *have to* know the encoding. Forcing programmers to be aware
of this problem is a good idea IMO.

You can certainly have a string type that uses byte arrays in UTF-8
encoding internally, but your string functions should be aware of that
and treat it as a unicode string. The len function and index operators
should count characters, not bytes. Add a byte array data type for
byte arrays instead.

2. The dynamic dispatch is messy. I agree that procedural is often
simpler and more efficient than object-oriented programming, but
object-oriented programming is useful just as often and should be made
a simple as possible. Since Nimrod seems flexible, perhaps it would be
possible to implement an object-orientation layer in Nimrod that hides
the dynamic dispatch complexity?

-- 
martin at librador.com
http://www.librador.com


From steven at REMOVE.THIS.cybersource.com.au  Tue May 12 05:20:36 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 May 2009 09:20:36 GMT
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz>
Message-ID: <pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>

On Tue, 12 May 2009 20:23:25 +1200, Lawrence D'Oliveiro wrote:

> In message <gu7f97$mt6$2 at reader1.panix.com>, kj wrote:
> 
>> I know about the construct:
>> 
>> try:
>>     # do something
>> except ...:
>>     # handle exception
>> else:
>>     # do something else
>> 
>> ...but I can't come with an example in which the same couldn't be
>> accomplished with [no else]
> 
> I'd agree. If you have to resort to a "try .. else", then might I
> respectfully suggest that you're using exceptions in a way that's
> complicated enough to get you into trouble.



try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available')
    raise
else:
    do_something_with(rsrc)
finally:
    rsrc.close()



is complicated? It seems pretty straightforward to me.



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Tue May 12 05:35:36 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 May 2009 09:35:36 GMT
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz>
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>

On Tue, 12 May 2009 09:20:36 +0000, Steven D'Aprano wrote:

> On Tue, 12 May 2009 20:23:25 +1200, Lawrence D'Oliveiro wrote:
> 
>> In message <gu7f97$mt6$2 at reader1.panix.com>, kj wrote:
>> 
>>> I know about the construct:
>>> 
>>> try:
>>>     # do something
>>> except ...:
>>>     # handle exception
>>> else:
>>>     # do something else
>>> 
>>> ...but I can't come with an example in which the same couldn't be
>>> accomplished with [no else]
>> 
>> I'd agree. If you have to resort to a "try .. else", then might I
>> respectfully suggest that you're using exceptions in a way that's
>> complicated enough to get you into trouble.
> 
> 
> 
> try:
>     rsrc = get(resource)
> except ResourceError:
>     log('no more resources available')
>     raise
> else:
>     do_something_with(rsrc)
> finally:
>     rsrc.close()



Except of course such a pattern won't work, because if get(resource) 
fails, rsrc will not exist to be closed. So a better, and simpler, 
example would be to drop the finally clause:

try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available')
    raise
else:
    do_something_with(rsrc)
    rsrc.close()


To really be safe, that should become:

try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available')
    raise
else:
    try:
        do_something_with(rsrc)
    finally:
        rsrc.close()


which is now starting to get a bit icky (but only a bit, and only because 
of the nesting, not because of the else).



-- 
Steven


From karlosbarlos at yahoo.com  Tue May 12 05:54:16 2009
From: karlosbarlos at yahoo.com (karlos barlos)
Date: Tue, 12 May 2009 02:54:16 -0700 (PDT)
Subject: No subject
Message-ID: <452312.52363.qm@web45506.mail.sp1.yahoo.com>

hello to all 

i have been using this script to add users to my active directory structure

i wise to make a loop in order for it to run for A large Number of Users 

can anyone give me some advice on the loop ??



import win32com,win32com.client
def add_acct(location,account):
??? 
? ad_obj=win32com.client.GetObject(location)
? ad_user=ad_obj.Create('user','cn='+user['login'])
? ad_user.Put('sAMAccountName',user['login'])
? ad_user.Put('userPrincipalName',user['login']+'@email.address.com')
? ad_user.Put('DisplayName',user['last']+' '+user['first']) #fullname
? ad_user.Put('givenName',user['first'])
? ad_user.Put('sn',user['last'])
? ad_user.Put('description','regular account')
? ad_user.Put('physicalDeliveryOfficeName','office 1')
? ad_user.Put('HomeDirectory',r'\\server1\ '[:-1]+user['login']) 
? ad_user.Put('HomeDrive','H:')
? ad_user.SetInfo();ad_user.GetInfo()
? ad_user.LoginScript='login.bat'
? ad_user.AccountDisabled=0
? ad_user.setpassword('the password')
? ad_user.Put('pwdLastSet',0) #-- force reset of password
? ad_user.SetInfo()


location='LDAP://OU=sales,DC=shay,DC=com'
user={'first':'shay','last':'smith','login':'shay123'}
add_acct(location,user)


location='LDAP://OU=sales,DC=shay,DC=com'
user={'first':'ron','last':'smith','login':'ron1267'}
add_acct(location,user)




      
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From mikael at isy.liu.se  Tue May 12 06:04:39 2009
From: mikael at isy.liu.se (Mikael Olofsson)
Date: Tue, 12 May 2009 12:04:39 +0200
Subject: Decorating methods - where do my arguments go?
In-Reply-To: <Xns9C095F0E58B75duncanbooth@127.0.0.1>
References: <gu167u$svk$1@news.lysator.liu.se>
	<gu1n81$ir7$03$1@news.t-online.com>
	<gu8u7s$l1$1@news.lysator.liu.se>
	<Xns9C08A5D9BCFA1duncanbooth@127.0.0.1>
	<gu954t$29r$1@news.lysator.liu.se>
	<gu9jo6$9bk$01$1@news.t-online.com>
	<guapa7$eri$1@news.lysator.liu.se>
	<0601fa8d-00af-41fe-86f7-5bb210ec268c@o14g2000vbo.googlegroups.com>
	<Xns9C095F0E58B75duncanbooth@127.0.0.1>
Message-ID: <gub4ev$hfo$1@news.lysator.liu.se>

Michele Simionato wrote:
 > Still it turns something which is a function into an object and
 > you lose the docstring and the signature. pydoc will not be too
 > happy with this approach.

Duncan Booth wrote:
> I don't know why Mikael wants to use a class rather than a function
> but if he wants to save state between calls this isn't going to help.

I've never used decorators before, and that's the main reason for my 
confusion. I have found myself in a situation where I think that 
decorators is the way to go. So I tried to find information about how to 
write them the usual way: Googling and browsing documentation. I found 
examples using both functions and classes, but not much explanation of 
what's going on, especially not in the class case. I didn't find any 
arguments for favouring any of those alternatives. Actually, most 
examples I found did not even include the definition of the actual 
decorator or any information about where they might come from, only the 
@-row.

Based on the above observations, I assumed that both alternatives were 
equally possible. The first answers I got here also led me to believe 
that that was the case. My understanding is that in most cases, you can 
use a callable object instead of a function with little or no practical 
difference, except the syntax of its definition. In my eyes, a class 
definition looks nicer and is more readable than a nested function. 
Therefore, I tend to define a class with a __call__ method and helper 
methods instead of nested functions, if I find the need.

Practicality beats purity, and it seem like using a class for decoration 
is a lot more hassle than using a function. I fold.

/MiO


From python.list at tim.thechases.com  Tue May 12 06:21:15 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 12 May 2009 05:21:15 -0500
Subject: dict would be very slow for big data
In-Reply-To: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>
References: <d08dfe33-6ea6-4e85-8c14-4da64b9c4dc9@d19g2000prh.googlegroups.com>
Message-ID: <4A094D9B.5040303@tim.thechases.com>

> i am trying to insert a lot of data into a dict, which may be
> 10,000,000 level.
> after inserting 100000 unit, the insert rate become very slow, 50,000/
> s, and the entire time used for this task would be very long,also.
> would anyone know some solution for this case?

As others have mentioned, you've likely run out of RAM and the 
slowness you feel is your OS swapping your process to disk.

If you need fast dict-like access to your data, I'd recommend 
shifting to a database -- perhaps the stock "anydbm" module[1]. 
The only catch is that it only supports strings as keys/values. 
But Python makes it fairly easy to marshal objects in/out of 
strings.  Alternatively, you could use the built-in (as of 
Python2.5) sqlite3 module to preserve your datatypes and query 
your dataset with the power of SQL.

-tkc


[1]
http://docs.python.org/library/anydbm.html







From javier.collado at gmail.com  Tue May 12 06:52:00 2009
From: javier.collado at gmail.com (Javier Collado)
Date: Tue, 12 May 2009 12:52:00 +0200
Subject: Is there a GUI for informing a user of missing dependencies?
In-Reply-To: <c84cea25-7c9f-40c8-aed3-5fe0d2e3a181@d19g2000prh.googlegroups.com>
References: <c84cea25-7c9f-40c8-aed3-5fe0d2e3a181@d19g2000prh.googlegroups.com>
Message-ID: <c83cde5a0905120352s5f29acdwfb4a6650fe569766@mail.gmail.com>

Hello,

I'm not an expert, but if you use setuptools for your application,
then a 'install_requires' argument would do the job. For more
information, please take a look at:
http://peak.telecommunity.com/DevCenter/setuptools

Best regards,
    Javier

2009/5/12 Jason <jason.heeris at gmail.com>:
> I'm writing a small GUI (Python 2.5/6) using wxPython and pySerial.
> Since these are both 3rd party modules, if a user doesn't have them
> installed and tries to run the GUI from a file browser, the app will
> fail silently. I'm hoping to avoid that.
>
> Sure, I'll have a readme file, but I was wondering if there is an even
> more direct way. I was going to roll my own (eg. very simple Tkinter
> fallback error dialog if wxPython import fails, wxPython error dialog
> if anything else is missing); but I was wondering if such a system
> already exists out there.
>
> ? Jason
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From ldo at geek-central.gen.new_zealand  Tue May 12 06:58:12 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 22:58:12 +1200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<02159679$0$20647$c3e8da3@news.astraweb.com>
	<towb-4F1754.17464609052009@news.individual.de>
Message-ID: <gubko4$nov$2@lust.ihug.co.nz>

In message <towb-4F1754.17464609052009 at news.individual.de>, Tobias Weber 
wrote:

> In article <02159679$0$20647$c3e8da3 at news.astraweb.com>,
>  Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:
> 
>> Maybe in another 20 years, nobody will care about low-level details like
>> the characters used to write code. Only the tokens really matter.
> 
> You could have that ten years ago with AppleScript. Gets annoying
> quickly...

To me, the annoying thing about the AppleScript Script Editor wasn't the 
tokenization, it was its insistence on overriding my decisions about where 
to continue a line.



From ldo at geek-central.gen.new_zealand  Tue May 12 07:00:17 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 23:00:17 +1200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
Message-ID: <gubks1$nov$3@lust.ihug.co.nz>

In message <towb-63CE3D.09322210052009 at news.individual.de>, Tobias Weber 
wrote:

> (still not gonna use software that doesn't let me type # because it's
> alt+3 on a UK layout; having to re-learn or configure that is just sick)

Tried typing compose-plus-plus?



From bearophileHUGS at lycos.com  Tue May 12 07:01:08 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 12 May 2009 04:01:08 -0700 (PDT)
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.29.1242119171.8015.python-list@python.org>
Message-ID: <b8c43ff9-bbe3-46ad-b98c-0a0d94c7723d@s31g2000vbp.googlegroups.com>

Martin Vilcans:
> Nice with a language with a new language designed for high
> performance. It seems like a direct competitor with D, i.e. a
> high-level language with low-level abilities.
> The Python-like syntax is a good idea.

There is Delight too:
http://delight.sourceforge.net/

But I agree, one disadvantage (and one advantage) the D language is
its significant syntactic and semantic compatibility with C.
I like the syntax of Nimrod, but I think Nimrod designer has to work
more on data parallelism and higher level forms of parallelism.
At the moment D language has not enough data parallelism features for
scientific programming purposes.

Bye,
bearophile


From ldo at geek-central.gen.new_zealand  Tue May 12 07:03:16 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 12 May 2009 23:03:16 +1200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
	<mailman.5400.1242000728.11746.python-list@python.org>
	<slrnh0fqu4.qcl.nick@irishsea.home.craig-wood.com>
Message-ID: <gubl1l$nov$4@lust.ihug.co.nz>

In message <slrnh0fqu4.qcl.nick at irishsea.home.craig-wood.com>, Nick Craig-
Wood wrote:

> Rhodri James <rhodri at wildebst.demon.co.uk> wrote:
>
>>  Emacs is my editor of choice ...
> 
> You probably haven't used MAC OS X then!

I tried using Emacs via SSH from a Mac once. Made me run screaming for the 
nearest Windows box 
<http://groups.google.co.nz/group/comp.sys.mac.advocacy/msg/dfad8bff6942e749>.



From aotto1968 at onlinehome.de  Tue May 12 07:08:28 2009
From: aotto1968 at onlinehome.de (Andreas Otto)
Date: Tue, 12 May 2009 13:08:28 +0200
Subject: ANNOUNCE: libmsgque 3.1
Message-ID: <gublbc$810$01$3@news.t-online.com>

ANNOUNCE a major feature improvement of libmsgque ...


What is LibMsgque
=================

LibMsgque is an OS independent, Programming Language independent and
Hardware independent solution to link applications together to act like a
single application. Or with other words, LibMsgque is an Application-Server
toolkit.


Highlights of the current Release:
=================================

This release introduce a couple of highlights into the LibMsgque World
including the Python 3.01 support and a brand new Tcl/Java interface

As bonus an C/Tcl/Java/Python performance test was added using the
following conditions:

  1. same basic native library -> libmsgque (written in C)
  2. same user -> me
  3. same performance management tool
  4. same code workflow using the native language interface
        to link libmsgque with a language specific service
        handler
  5. testing the following aspects:
        a) application startup/shutdown performance
        b) synchronous and asynchronous transaction performance
        c) spawn, fork and thread process creation performance

  -> results: http://libmsgque.sourceforge.net/performance.htm


Programmer-Visible-Changes:
===========================

Add Python 3.01 support
  This is the next step to provide an OS and programming language
  independent solution

New Tcl and Java Library binding
  Now Tcl, Java and Python using the same function namespace
  to improve the cross language code readability

C library improvement including better error checking support
  Add more error-case checking

Add new test hardware, apple iBook (ppc) running Debian 5
  Put my old iBook back to live

Re-Add big/little endian support
  Now be able to test endianness

Improve 32Bit/64Bit support
  Code Cleanup

Add new documentation
  Entire new documentation and examples were added


The Web-Site was updated:
=========================

   -> http://libmsgque.sourceforge.net

  For a fast introduction use the following URL:

   -> http://libmsgque.sourceforge.net/features.htm



mfg

  Andreas Otto


From samwyse at gmail.com  Tue May 12 07:45:41 2009
From: samwyse at gmail.com (samwyse)
Date: Tue, 12 May 2009 04:45:41 -0700 (PDT)
Subject: creating classes with mix-ins
References: <d6409bb3-f2ed-4964-942a-b0698060a7f0@e24g2000vbe.googlegroups.com>
	<fe808a4d-26e0-4003-be1a-2e768d7d81cc@r13g2000vbr.googlegroups.com>
Message-ID: <5c569b1b-5804-41e5-b384-149f67475af4@m24g2000vbp.googlegroups.com>

On May 11, 9:01?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 11, 11:16?am, samwyse <samw... at gmail.com> wrote:
>
> > Should I use a class decorator, or a metaclass?
>
> Here's the thing: unless you have advance knowledge of the methods
> defined by self.blog, you can't get the attr_list at class definition
> time, which means neither the metaclass nor the decorator would be a
> good approach. ?If that's the case, you should define newPost,
> editPost, and whatever other methods of self.blog as ordinary
> attributes of self, within the init function. ?boilerplate would be
> the same except you would pass self to it and allow template to use it
> from its nested scope (it would no longer be an instance method since
> it's an ordinary attribute).
>
> If you do know what the methods of self.blog will be, then that's
> where you get attr_list from. ?So, for instance, if blogHandler always
> returns an object of type Blog, then you could inspect Blog's type
> dict to see what methods are defined in it; in fact you probably want
> to check the whole MRO for Blog, like this (untested):
>
> attr_list = []
> for cls in Blog.__mro__:
> ? ? for value in cls.__dict__:
> ? ? ? ? if is_wrapped_method(value):
> ? ? ? ? ? ? attr_list.append(value)
>
> A metaclass is probably overkill to assign the wrapped blog methods.
> I probably wouldn't even bother with the decorator, and just write the
> loop after the class definition. ?Then you can use MetaBlog directly
> for klass.
>
> class MetaBlog(object):
> ? ? ...
>
> for what in attr_list:
> ? ? setattr(MetaBlog, what, boilerplate(what))
>
> If it were the kind of thing I found myself doing often I'd refactor
> into a decorator.

Unfortunately, 'boilerplate()' uses the handlers that I provide when
MetaBlog is instantiated.  I tried the following, but it didn't work
(for reasons that were obvious in retrospect).

def instantiate_template(m_name, instance):
    isAuthorised = instance.security.isAuthorised
    method_to_wrap = getattr(instance.blog, m_name)
    def template(self, which, username, password, *args):
        if not isAuthorised(username, password, which, m_name):
            raise Exception('Unauthorised access')
        return method_to_wrap(which, *args)
    template.__name__ = method_to_wrap.__name__
    template.__doc__ = method_to_wrap.__doc__
    return template

class MetaWeblog(object):
    def __init__(self,
                 securityHandler=SimpleSecurityHandler,
                 blogHandler=SimpleBlogHandler):
        self.security = securityHandler()
        self.blog = blogHandler()
        # from http://www.xmlrpc.com/metaWeblogApi
        m_prefix = 'metaWeblog.'
        m_list = ('newPost', 'editPost', 'getPost', 'newMediaObject',
                  'getCategories', 'getRecentPosts', )

        # Here's where things fell apart
        for m_name in m_list:
            dotted_name = m_prefix + m_name
            method = instantiate_template(m_name, self)
            setattr(self, dotted_name, method)

So, I replaced that last for-loop with this:

        # Since we're about to monkey-patch the class, we should
        # make certain that all instances use the same handlers.
        handlers = (self.security, self.blog)
        try:
            assert getattr(self.__class__, '_handlers') == handlers
        except AttributeError:
            for m_name in m_list:
                dotted_name = m_prefix + m_name
                method = instantiate_template(m_name, self)
                setattr(self.__class__, dotted_name, method)
            setattr(self.__class__, '_handlers', handlers)

This is good enough for now, since I can't conceive of a reason why
MetaBlog would be instantiated more than once.  If it were, on the
other hand, it would probably be because you wanted to use different
handlers.  In that case, I think I'd want to use a class factory,
something like this:
    server.register_instance(
        MetaWeblogFactory(securityHandler, blogHandler)()
    )

Anyway, thanks for getting me over a conceptual hump.


From rahul03535 at gmail.com  Tue May 12 07:51:18 2009
From: rahul03535 at gmail.com (rahul)
Date: Tue, 12 May 2009 04:51:18 -0700 (PDT)
Subject: Python API Functions equivalent to  ruby's  rb_big2str() and 
	rb_str2cstr()
Message-ID: <1553614d-4485-4b46-a779-08b4040071f8@d38g2000prn.googlegroups.com>

Is functions equivalent to ruby's  rb_big2str() and rb_str2cstr()
available in Python.
I had search a lot in google but not able to find that.
If anybody know than please give me the name of those functions of
Python.


From david.geldreich at free.fr  Tue May 12 07:53:39 2009
From: david.geldreich at free.fr (r2d3)
Date: Tue, 12 May 2009 04:53:39 -0700 (PDT)
Subject: Compiling Python on Windows : how to deal with modules ?
References: <b83cb71b-791d-473a-b312-f7643a798f19@s28g2000vbp.googlegroups.com>
Message-ID: <8234b79f-9d0b-4f66-b8b1-fa99161b83a0@j12g2000vbl.googlegroups.com>

Hi all,

after some investigation, I managed to find how to do this "manually".
I post it here if it could help others...

1) on windows, mostly all the dynamic libraries (time, socket, ...)
are statically linked into python26.dll
2) all the modules are located in lib/ and some .pyd (in fact renamed
dll files) live in PCbuild
3) "PCBuild\python -m compileall lib" will compile all the .py under
lib which then could by zipped into a single python26.zip

So I will just need to distribute python26.dll and python26.zip with
my app and set sys.path (using PySys_SetPath) to point to python26.zip
+ the place where I store the .pyd.

I will solve the "user want to add other module" later using
PYTHONPATH or allowing the user to add python path through our GUI.

Best regards.

On 11 mai, 10:49, r2d3 <david.geldre... at free.fr> wrote:
> I am using Python embedded in my application (OSX,Windows) and I need
> to distribute Python as part of my application.
>
> On OSX, no problem, I got a self contained framework (with dynamic
> library and all the modules).
>
> On Windows, I manage to compile Python 2.6.2 with PCbuild\build.bat
> and I get python26.dll/python26_d.dll.
>
> But the readme gives no clue about how to deal with the module
> "compilation"/installation.
>
> So how do I "compile"/package all the modules that comes with Python
> source distribution on Windows ? To embed it in my distribution, I
> just copy the whole Modules tree (only pyc/pyo/pyd files ?) ? and set
> the right sys.path from my C code (using PySys_SetPath) ?


From ronn.ross at gmail.com  Tue May 12 07:54:35 2009
From: ronn.ross at gmail.com (Ronn Ross)
Date: Tue, 12 May 2009 07:54:35 -0400
Subject: Sorting a dictionary
Message-ID: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>

I'm attempting to sort for the results of a dictionary. I would like to
short by the 'key' in ascending order. I have already made several attempts
using: sorted() and .sort().
Here is my loop:
    for key,value in word_count.items():
        print sorted(key), "=", value

Thanks
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From jenn.duerr at gmail.com  Tue May 12 07:58:59 2009
From: jenn.duerr at gmail.com (noydb)
Date: Tue, 12 May 2009 04:58:59 -0700 (PDT)
Subject: putting date strings in order
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>
	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
Message-ID: <d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>

On May 11, 11:30?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> noydb <jenn.du... at gmail.com> writes:
> > Anyone have any good ideas? ?I was curious to see what people came up
> > with.
>
> Is this a homework assignment? ?Some hints:
>
> 1) figure out how to compare two month names for chronological order,
> ? ?leaving out the issue of the starting month not being january.
> 2) figure out how to adjust for the starting month. ?The exact
> ? ?semantics of the "%" operator might help do this concisely.

Ha!  No, this is not a homework assignment.  I just find myself to be
not the most eloquent and efficient scripter and wanted to see how
others would approach it.

I'm not sure how I follow your suggestion.  I have not worked with the
%.  Can you provide a snippet of your idea in code form?

I thought about assigning a number string (like 'x_1') to any string
containing 'jan' -- so x_jan would become x_1, and so on.  Then I
could loop through with a counter on the position of the number (which
is something i will need to do, comparing one month to the next
chronological month, then that next month to its next month, and so
on).  And as for the starting postion, the user could declare, ie, aug
the start month.  aug is position 8.  therefore subtract 7 from each
value, thus aug becomes 1.... but then I guess early months would have
to be add 5, such that july would become 12.  Ugh, seems sloppy to me.

Something like that....   seems poor to me.  Anybody have a bteer
idea, existing code???


From andreengels at gmail.com  Tue May 12 08:04:10 2009
From: andreengels at gmail.com (Andre Engels)
Date: Tue, 12 May 2009 14:04:10 +0200
Subject: Sorting a dictionary
In-Reply-To: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>
References: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>
Message-ID: <6faf39c90905120504r1aae3527jead4506e32b42b32@mail.gmail.com>

On Tue, May 12, 2009 at 1:54 PM, Ronn Ross <ronn.ross at gmail.com> wrote:
> I'm attempting to sort for the results of a dictionary. I would like to
> short by the 'key' in ascending order. I have already made several attempts
> using: sorted() and .sort().
> Here is my loop:
> ??? for key,value in word_count.items():
> ??? ??? print sorted(key), "=", value

That won't work. "key" will each time be the specific key, which you
then try to sort. Instead you want to sort the _set_ of pairs by their
first element. Luckily the default sort order of a tuple is by the value
of its first element, so you can do:

for key,value in sorted(word_count.items()):
   print key, "=", value





-- 
Andr? Engels, andreengels at gmail.com


From aqeelahmed821 at gmail.com  Tue May 12 08:16:06 2009
From: aqeelahmed821 at gmail.com (Aqeel Ahmed Rajpar)
Date: Tue, 12 May 2009 05:16:06 -0700 (PDT)
Subject: EURO NEWS FINALLY LAUNCHED THEIR BLOG
Message-ID: <48154f6e-2429-44c3-a5e6-cc6b447caf1a@y6g2000prf.googlegroups.com>

TO SUBSCRIBE THE BLOG VIA EMAIL VISIT

www.euronewspk.blogspot.com


From jaime.frio at gmail.com  Tue May 12 08:17:54 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Tue, 12 May 2009 14:17:54 +0200
Subject: Sorting a dictionary
In-Reply-To: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>
References: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>
Message-ID: <97a8f1a70905120517q5be1fbb2u1532d5923b721404@mail.gmail.com>

This one I think I know... Try with:

for k in sorted(word_count) :
    print k,"=",word_count[k]

You need to do the sorting before iterating over the keys...

Jaime

On Tue, May 12, 2009 at 1:54 PM, Ronn Ross <ronn.ross at gmail.com> wrote:
> I'm attempting to sort for the results of a dictionary. I would like to
> short by the 'key' in ascending order. I have already made several attempts
> using: sorted() and .sort().
> Here is my loop:
> ??? for key,value in word_count.items():
> ??? ??? print sorted(key), "=", value
>
> Thanks
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From lists at cheimes.de  Tue May 12 08:25:08 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 12 May 2009 14:25:08 +0200
Subject: Python API Functions equivalent to  ruby's  rb_big2str() and
	rb_str2cstr()
In-Reply-To: <1553614d-4485-4b46-a779-08b4040071f8@d38g2000prn.googlegroups.com>
References: <1553614d-4485-4b46-a779-08b4040071f8@d38g2000prn.googlegroups.com>
Message-ID: <gubpr3$556$1@ger.gmane.org>

rahul schrieb:
> Is functions equivalent to ruby's  rb_big2str() and rb_str2cstr()
> available in Python.
> I had search a lot in google but not able to find that.
> If anybody know than please give me the name of those functions of
> Python.

Please don't assume that we know what the Ruby functions are doing. You
need to explain them or at least provide a link to some docs.

Christian



From bearophileHUGS at lycos.com  Tue May 12 08:27:58 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 12 May 2009 05:27:58 -0700 (PDT)
Subject: putting date strings in order
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>
	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
Message-ID: <735da351-b729-4949-b3ad-46d9b3206772@g20g2000vba.googlegroups.com>

noydb:

> I have not worked with the %.
> Can you provide a snippet of your idea in code form?

Then it's a very good moment to learn using it:
http://en.wikipedia.org/wiki/Modulo_operator

>>> 10 % 3
1
>>> 10 % 20
10
>>> -10 % 3
2
>>> -10 % -3
-1


>Something like that....<

Implement your first version, run it, and show us its output. Then I/
we can try to give you suggestions to improve your code.


>existing code???<

Sometimes you have to write code... that's life.

Bye,
bearophile


From jaime.frio at gmail.com  Tue May 12 08:38:57 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Tue, 12 May 2009 14:38:57 +0200
Subject: putting date strings in order
In-Reply-To: <d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>
	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
Message-ID: <97a8f1a70905120538p10b5a846j75a40a25724ad399@mail.gmail.com>

If you simply want to generate an ordered list of months, start with
it in order:

    dates = ["x_jan",...,"x_dec"]

and if the desired starting month is

    start = 6 # i.e. x_jun

    dates = dates[start - 1:] + dates[:start - 1]

If you have to sort the list itself, I would use an intermediate
dictionary to hold the positions, as in:

    months = {"x_jan" : 1, ..., "x_dec" : 12}

You can then sort the list with :

    dates.sort(None,lambda x : months[x])

and then do the

    dates = dates[start - 1:] + dates[:start - 1]

or alternatively you can get the sorting directly as you want it with:

    dates.sort(None,lambda x : (months[x] - start + 1) % 12)


Jaime



On Tue, May 12, 2009 at 1:58 PM, noydb <jenn.duerr at gmail.com> wrote:
> On May 11, 11:30?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>> noydb <jenn.du... at gmail.com> writes:
>> > Anyone have any good ideas? ?I was curious to see what people came up
>> > with.
>>
>> Is this a homework assignment? ?Some hints:
>>
>> 1) figure out how to compare two month names for chronological order,
>> ? ?leaving out the issue of the starting month not being january.
>> 2) figure out how to adjust for the starting month. ?The exact
>> ? ?semantics of the "%" operator might help do this concisely.
>
> Ha! ?No, this is not a homework assignment. ?I just find myself to be
> not the most eloquent and efficient scripter and wanted to see how
> others would approach it.
>
> I'm not sure how I follow your suggestion. ?I have not worked with the
> %. ?Can you provide a snippet of your idea in code form?
>
> I thought about assigning a number string (like 'x_1') to any string
> containing 'jan' -- so x_jan would become x_1, and so on. ?Then I
> could loop through with a counter on the position of the number (which
> is something i will need to do, comparing one month to the next
> chronological month, then that next month to its next month, and so
> on). ?And as for the starting postion, the user could declare, ie, aug
> the start month. ?aug is position 8. ?therefore subtract 7 from each
> value, thus aug becomes 1.... but then I guess early months would have
> to be add 5, such that july would become 12. ?Ugh, seems sloppy to me.
>
> Something like that.... ? seems poor to me. ?Anybody have a bteer
> idea, existing code???
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From sasurve at gmail.com  Tue May 12 08:49:38 2009
From: sasurve at gmail.com (shruti surve)
Date: Tue, 12 May 2009 18:19:38 +0530
Subject: About progress bar in glade
Message-ID: <862e00220905120549y19e4dce7l525efe9018d686ea@mail.gmail.com>

hi

i am using progress bar in glade and python file. When i clicked on menu
item, open office spreadsheet will be opened. but it takes some time to open
up, so i want to add progress bar. Now, when i clicked on menu item,dialog
with progress bar is coming and progress bar is pulsating but xml_rpc calls
running at back end stopped working. Once i close the dialog box,rpc start
working. But both should work simultaneously. What should i do for this??


regards

shruti
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From sasurve at gmail.com  Tue May 12 08:51:55 2009
From: sasurve at gmail.com (shruti surve)
Date: Tue, 12 May 2009 18:21:55 +0530
Subject: multithreading in python
Message-ID: <862e00220905120551r1a7c8a7xf708e4758d086bd3@mail.gmail.com>

hi,
 how to do multithreading in python??? Like running dialog box and running
xml rpc calls simultaneously???


regards
shruti
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From google at mrabarnett.plus.com  Tue May 12 08:53:50 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 12 May 2009 13:53:50 +0100
Subject: putting date strings in order
In-Reply-To: <d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
Message-ID: <4A09715E.8040908@mrabarnett.plus.com>

noydb wrote:
> On May 11, 11:30 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>> noydb <jenn.du... at gmail.com> writes:
>>> Anyone have any good ideas?  I was curious to see what people came up
>>> with.
>> Is this a homework assignment?  Some hints:
>>
>> 1) figure out how to compare two month names for chronological order,
>>    leaving out the issue of the starting month not being january.
>> 2) figure out how to adjust for the starting month.  The exact
>>    semantics of the "%" operator might help do this concisely.
> 
> Ha!  No, this is not a homework assignment.  I just find myself to be
> not the most eloquent and efficient scripter and wanted to see how
> others would approach it.
> 
> I'm not sure how I follow your suggestion.  I have not worked with the
> %.  Can you provide a snippet of your idea in code form?
> 
> I thought about assigning a number string (like 'x_1') to any string
> containing 'jan' -- so x_jan would become x_1, and so on.  Then I
> could loop through with a counter on the position of the number (which
> is something i will need to do, comparing one month to the next
> chronological month, then that next month to its next month, and so
> on).  And as for the starting postion, the user could declare, ie, aug
> the start month.  aug is position 8.  therefore subtract 7 from each
> value, thus aug becomes 1.... but then I guess early months would have
> to be add 5, such that july would become 12.  Ugh, seems sloppy to me.
> 
> Something like that....   seems poor to me.  Anybody have a bteer
> idea, existing code???

Sort the list, passing a function as the 'key' argument. The function
should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
you want to have a different start month then add the appropriate
integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
to make it wrap around (there are only 12 months in a year), returning
the result.


From rahul03535 at gmail.com  Tue May 12 09:01:24 2009
From: rahul03535 at gmail.com (rahul)
Date: Tue, 12 May 2009 06:01:24 -0700 (PDT)
Subject: Python API Functions equivalent to ruby's rb_big2str() and 
	rb_str2cstr()
References: <1553614d-4485-4b46-a779-08b4040071f8@d38g2000prn.googlegroups.com>
	<mailman.39.1242131126.8015.python-list@python.org>
Message-ID: <d563c582-259d-43be-bf07-04ac6ccbcf21@k9g2000pra.googlegroups.com>

On May 12, 5:25?pm, Christian Heimes <li... at cheimes.de> wrote:
> rahul schrieb:
>
> > Is functions equivalent to ruby's ?rb_big2str() and rb_str2cstr()
> > available in Python.
> > I had search a lot in google but not able to find that.
> > If anybody know than please give me the name of those functions of
> > Python.
>
> Please don't assume that we know what the Ruby functions are doing. You
> need to explain them or at least provide a link to some docs.
>
> Christian

Hi Christian,
  rb_big2str(Big-Integer, base) of ruby returns string representation
of big-Integer. now, i am able to find equivalent python API function
of rb_str2cstr() of ruby.
so , please help me about rb_big2str(Big-Integer, base) equivalent of
Python API function which i can use in extended module in c.

---
 rahul

---
rahul


From almar.klein at gmail.com  Tue May 12 09:06:20 2009
From: almar.klein at gmail.com (Almar Klein)
Date: Tue, 12 May 2009 15:06:20 +0200
Subject: multithreading in python
In-Reply-To: <862e00220905120551r1a7c8a7xf708e4758d086bd3@mail.gmail.com>
References: <862e00220905120551r1a7c8a7xf708e4758d086bd3@mail.gmail.com>
Message-ID: <cc38d75f0905120606g4bd774bbj831e6df67f4f264c@mail.gmail.com>

See the standard help on the threading and thread module.

Almar

2009/5/12 shruti surve <sasurve at gmail.com>:
> hi,
> ?how to do multithreading in python??? Like running dialog box and running
> xml rpc calls simultaneously???
>
>
> regards
> shruti
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From rumpf_a at web.de  Tue May 12 09:10:02 2009
From: rumpf_a at web.de (rumpf_a at web.de)
Date: Tue, 12 May 2009 06:10:02 -0700 (PDT)
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.29.1242119171.8015.python-list@python.org>
Message-ID: <043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>

> There are two showstoppers for me though:
>
> 1. Introducing a new programming language where the char type is a
> byte is anachronistic. You're saying that programmers don't have to
> care about the string encoding and can just treat them as an array of
> bytes. That is exactly what causes all the problems with applications
> that haven't been designed to handle anything but ASCII. If you're
> doing any logic with strings except dumb reading and writing, you
> typically *have to* know the encoding. Forcing programmers to be aware
> of this problem is a good idea IMO.
>
> You can certainly have a string type that uses byte arrays in UTF-8
> encoding internally, but your string functions should be aware of that
> and treat it as a unicode string. The len function and index operators
> should count characters, not bytes. Add a byte array data type for
> byte arrays instead.
>
It's not easy. I think Python3's byte arrays have an "upper" method
(and a string literal syntax b"abc") which is quite alarming to me
that they chose the wrong default.

Eventually the "rope" data structure (that the compiler uses heavily)
will become a proper part of the library: By "rope" I mean an
immutable string implemented as a tree, so concatenation is O(1). For
immutable strings there is no ``[]=`` operation, so using UTF-8 and
converting it to a 32bit char works better.

> 2. The dynamic dispatch is messy. I agree that procedural is often
> simpler and more efficient than object-oriented programming, but
> object-oriented programming is useful just as often and should be made
> a simple as possible. Since Nimrod seems flexible, perhaps it would be
> possible to implement an object-orientation layer in Nimrod that hides
> the dynamic dispatch complexity?
>
Yes, I already have an idea how to improve it.


From davea at ieee.org  Tue May 12 09:19:31 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 12 May 2009 09:19:31 -0400
Subject: Is there a GUI for informing a user of missing dependencies?
In-Reply-To: <c84cea25-7c9f-40c8-aed3-5fe0d2e3a181@d19g2000prh.googlegroups.com>
References: <c84cea25-7c9f-40c8-aed3-5fe0d2e3a181@d19g2000prh.googlegroups.com>
Message-ID: <4A097763.1090209@ieee.org>



Jason wrote:
> I'm writing a small GUI (Python 2.5/6) using wxPython and pySerial.
> Since these are both 3rd party modules, if a user doesn't have them
> installed and tries to run the GUI from a file browser, the app will
> fail silently. I'm hoping to avoid that.
>
> Sure, I'll have a readme file, but I was wondering if there is an even
> more direct way. I was going to roll my own (eg. very simple Tkinter
> fallback error dialog if wxPython import fails, wxPython error dialog
> if anything else is missing); but I was wondering if such a system
> already exists out there.
>
> ? Jason
>
>   
One approach is something like:

import subprocess

errorstring = "echo XXX error occurred in my code. type 'exit' to close 
this shell window "
parms = ["cmd.exe", "/k"]
parms.append( errorstring )
subprocess.call(parms)

Any message can be built as long as it fits on one "line". And if more 
is needed, a batch file can be run instead of just "echo" at the 
beginning of the errorstring.

The user gets a command shell that he can then use to investigate 
various things, such as environment variables. And the shell goes away 
when he types the command "exit". The python program doesn't terminate 
till the user does so.

This is Windows specific, so certainly your Tkinter approach is more 
general. On the other hand, the user might have a subset of the standard 
Python installed, and Tkinter might have been deleted from his system.

If it has to work on older Python versions, you might go with 
os.system() or other similar things.



From ganesh.gbg at gmail.com  Tue May 12 09:21:10 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Tue, 12 May 2009 06:21:10 -0700 (PDT)
Subject: AssertionError - help me to solve this in a programme with Queue
Message-ID: <354106db-c900-48f4-a83f-5fa9482ecddb@x29g2000prf.googlegroups.com>

Hi all,
I'm just learning python ,the code below is found in one of the
sites ,it produces an error like
Traceback (most recent call last):
  File "queue.py", line 34, in <module>
    main()
  File "queue.py", line 28, in main
    t=MyThread(q)
  File "/usr/lib/python2.5/threading.py", line 398, in __init__
    assert group is None, "group argument must be None for now"
AssertionError: group argument must be None for now

can any one help me to find the reason

the code I wrote is


hosts =["http://yahoo.com", "http://google.com"]

# create a queue class
q=Queue.Queue()

#Thread class
class MyThread(threading.Thread):
	# define __int__ method acting like constructor
	def __int__(self,q):
		threading.Thread.__init__(self)
		self.q=q
	def run(self):
		h=self.q.get()
		opens=urllib2.urlopen(h)
		print opens.read(100)

		# signal the queue to say job is done
		self.q.task_done()
a=time.time()
def main():
	# create a pool of thread
	for i in range(5):
		t=MyThread(q)
		t.setDaemon(True)
		t.start()
	for h in hosts:
		queue.put(h)
	q.join()
main()
print "Time elasped : %s "%(time.time()-a)


The problem may be silly ,hence I'm every new to python i need your
guidance .




From sjmachin at lexicon.net  Tue May 12 09:27:21 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 12 May 2009 13:27:21 +0000 (UTC)
Subject: putting date strings in order
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
	<4A09715E.8040908@mrabarnett.plus.com>
Message-ID: <loom.20090512T132528-778@post.gmane.org>

MRAB <google <at> mrabarnett.plus.com> writes:
> 
> Sort the list, passing a function as the 'key' argument. The function
> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
> you want to have a different start month then add

and if you don't like what that produces, try subtract :-)

> the appropriate
> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
> to make it wrap around (there are only 12 months in a year), returning
> the result.

HTH,
John




From rumpf_a at web.de  Tue May 12 09:27:32 2009
From: rumpf_a at web.de (rumpf_a at web.de)
Date: Tue, 12 May 2009 06:27:32 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
	<4519cc9d-f765-4f55-81b2-58abfa20b988@p4g2000vba.googlegroups.com>
Message-ID: <49c224c0-1f58-4ff9-965c-a12f0aa26276@m24g2000vbp.googlegroups.com>

> > > The language and library are missing arbitrary precision integer
> > > arithmetic, using GMP or something like that.
>
> > True, but currently not a high priority for me.
>
> Too bad. That makes Nimrod officially "worthless", i.e., of no
> value to me.
>
Well, you could write a wrapper for GMP (and contribute to the
project ;-)).


From davea at ieee.org  Tue May 12 09:33:53 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 12 May 2009 09:33:53 -0400
Subject: how to write loop (was "no subject")
In-Reply-To: <452312.52363.qm@web45506.mail.sp1.yahoo.com>
References: <452312.52363.qm@web45506.mail.sp1.yahoo.com>
Message-ID: <4A097AC1.9080003@ieee.org>

karlos barlos wrote:
> hello to all 
>
> i have been using this script to add users to my active directory structure
>
> i wise to make a loop in order for it to run for A large Number of Users 
>
> can anyone give me some advice on the loop ??
>
>
>
> import win32com,win32com.client
> def add_acct(location,account):
>     
>   ad_obj=win32com.client.GetObject(location)
>   ad_user=ad_obj.Create('user','cn='+user['login'])
>   ad_user.Put('sAMAccountName',user['login'])
>   ad_user.Put('userPrincipalName',user['login']+'@email.address.com')
>   ad_user.Put('DisplayName',user['last']+' '+user['first']) #fullname
>   ad_user.Put('givenName',user['first'])
>   ad_user.Put('sn',user['last'])
>   ad_user.Put('description','regular account')
>   ad_user.Put('physicalDeliveryOfficeName','office 1')
>   ad_user.Put('HomeDirectory',r'\\server1\ '[:-1]+user['login']) 
>   ad_user.Put('HomeDrive','H:')
>   ad_user.SetInfo();ad_user.GetInfo()
>   ad_user.LoginScript='login.bat'
>   ad_user.AccountDisabled=0
>   ad_user.setpassword('the password')
>   ad_user.Put('pwdLastSet',0) #-- force reset of password
>   ad_user.SetInfo()
>
>
> location='LDAP://OU=sales,DC=shay,DC=com'
> user={'first':'shay','last':'smith','login':'shay123'}
> add_acct(location,user)
>
>
> location='LDAP://OU=sales,DC=shay,DC=com'
> user={'first':'ron','last':'smith','login':'ron1267'}
> add_acct(location,user)
>
>
>
>   
Your formal parameter "account" needs to be "user" to match the references.

What could be a loop?  You have two users added at the bottom which 
could be done as a loop, but only if you have some structure to loop 
over.  So before you make it a loop, you have to decide what that 
structure is, and whether creating it is more work than just continuing 
with your present model of an unrolled loop.

Examples of structures might be:
    a list of user information.  But building that list would be as much 
work as you have now.
    a text file.  Good idea.  It might be populated with Excel, or any 
other program that can produce a csv file, or a formatted text file.  Or 
it might be populated with a text editor, with verification.
    an interactive session.  The user types in the information one user 
at  a time, into a form.  You just loop through, presenting the form, 
and processing the information entered.
     an existing user database.  This might be  a loop that transfers 
information from one format to another.

Decide the structure, and you can readily write the loop.

>       
>   


From google at mrabarnett.plus.com  Tue May 12 09:34:29 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 12 May 2009 14:34:29 +0100
Subject: AssertionError - help me to solve this in a programme with Queue
In-Reply-To: <354106db-c900-48f4-a83f-5fa9482ecddb@x29g2000prf.googlegroups.com>
References: <354106db-c900-48f4-a83f-5fa9482ecddb@x29g2000prf.googlegroups.com>
Message-ID: <4A097AE5.5030702@mrabarnett.plus.com>

gganesh wrote:
> Hi all,
> I'm just learning python ,the code below is found in one of the
> sites ,it produces an error like
> Traceback (most recent call last):
>   File "queue.py", line 34, in <module>
>     main()
>   File "queue.py", line 28, in main
>     t=MyThread(q)
>   File "/usr/lib/python2.5/threading.py", line 398, in __init__
>     assert group is None, "group argument must be None for now"
> AssertionError: group argument must be None for now
> 
> can any one help me to find the reason
> 
> the code I wrote is
> 
> 
> hosts =["http://yahoo.com", "http://google.com"]
> 
> # create a queue class
> q=Queue.Queue()
> 
> #Thread class
> class MyThread(threading.Thread):
> 	# define __int__ method acting like constructor
> 	def __int__(self,q):
               ^^^
               Should be __init__.

> 		threading.Thread.__init__(self)
> 		self.q=q
> 	def run(self):
> 		h=self.q.get()
> 		opens=urllib2.urlopen(h)
> 		print opens.read(100)
> 
> 		# signal the queue to say job is done
> 		self.q.task_done()
> a=time.time()
> def main():
> 	# create a pool of thread
> 	for i in range(5):
> 		t=MyThread(q)
> 		t.setDaemon(True)
> 		t.start()
> 	for h in hosts:
> 		queue.put(h)
> 	q.join()
> main()
> print "Time elasped : %s "%(time.time()-a)
> 
> 
> The problem may be silly ,hence I'm every new to python i need your
> guidance .
> 
> 



From sasurve at gmail.com  Tue May 12 09:38:32 2009
From: sasurve at gmail.com (shruti surve)
Date: Tue, 12 May 2009 19:08:32 +0530
Subject: About progress bar in glade
In-Reply-To: <862e00220905120549y19e4dce7l525efe9018d686ea@mail.gmail.com>
References: <862e00220905120549y19e4dce7l525efe9018d686ea@mail.gmail.com>
Message-ID: <862e00220905120638t532d7215l1b26205956b5fa9c@mail.gmail.com>

On Tue, May 12, 2009 at 6:19 PM, shruti surve <sasurve at gmail.com> wrote:

> hi
>
> i am using progress bar in glade and python file. When i clicked on menu
> item, open office spreadsheet will be opened. but it takes some time to open
> up, so i want to add progress bar. Now, when i clicked on menu item,dialog
> with progress bar is coming and progress bar is pulsating but other
> processes at front end  stopped working. So,its  blocking all other
> processes. But both should work simultaneously. What should i do for this??
>
>
> regards
>
> shruti
>
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From hniksic at xemacs.org  Tue May 12 09:48:52 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Tue, 12 May 2009 15:48:52 +0200
Subject: Python API Functions equivalent to ruby's rb_big2str() and
	rb_str2cstr()
References: <1553614d-4485-4b46-a779-08b4040071f8@d38g2000prn.googlegroups.com>
	<mailman.39.1242131126.8015.python-list@python.org>
	<d563c582-259d-43be-bf07-04ac6ccbcf21@k9g2000pra.googlegroups.com>
Message-ID: <877i0mph2z.fsf@busola.homelinux.net>

rahul <rahul03535 at gmail.com> writes:

> Hi Christian,
>   rb_big2str(Big-Integer, base) of ruby returns string representation
> of big-Integer. now, i am able to find equivalent python API function
> of rb_str2cstr() of ruby.

That would be PyLong_FromString, for the sake of later searches.

> so , please help me about rb_big2str(Big-Integer, base) equivalent of
> Python API function which i can use in extended module in c.

You can use PyObject_Str(long_object) to convert long to string.  No
special function is needed.


From rumpf_a at web.de  Tue May 12 09:49:36 2009
From: rumpf_a at web.de (rumpf_a at web.de)
Date: Tue, 12 May 2009 06:49:36 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
	<7x4ovrkxu1.fsf@ruckus.brouhaha.com>
Message-ID: <fb1691d2-c251-4fb1-a7e5-3b22463402b4@p4g2000vba.googlegroups.com>

> > That is already the case: The Pascal version is translated to Nimrod
> > and than compiles itself. Bootstrapping works.
>
> I meant why not get rid of the translation step and implement the
> compiler in idiomatic Nimrod.
>
Not until version 1.0 is out. This way the language can evolve more
easily.

> > The plan is to use LLVM as a backend and perhaps
> >http://tinystm.org/. Of course, this is only wishful thinking. ;-)
>
> Oh cool, I didn't know about tinystm. ?But, my question about
> mutability is how you protect STM transactions when other threads can
> have references into shared mutable structures and clobber the
> referents. ?GHC uses its type system to prevent that, but I don't see
> how Nimrod can really do the same, especially without GHC's rich set
> of immutable types including stuff like immutable maps.
>
Well STM transactions in an imperative context are still being
actively researched. Sorry I have no better answer.

> Have you ever looked at Tim Sweeney's presentation "The Next
> Mainstream Programming Language"?
Yes. It's awsome. But the next mainstream programming language also
needs a massive amount of money to take off, so I don't think it will
be Nimrod. :-)


From ganesh.gbg at gmail.com  Tue May 12 09:51:22 2009
From: ganesh.gbg at gmail.com (gganesh)
Date: Tue, 12 May 2009 06:51:22 -0700 (PDT)
Subject: AssertionError - help me to solve this in a programme with Queue
References: <354106db-c900-48f4-a83f-5fa9482ecddb@x29g2000prf.googlegroups.com>
	<mailman.49.1242135267.8015.python-list@python.org>
Message-ID: <cb7ee449-7102-4501-a28b-71c7eebd3b70@n7g2000prc.googlegroups.com>

On May 12, 6:34?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> gganesh wrote:
> > Hi all,
> > I'm just learning python ,the code below is found in one of the
> > sites ,it produces an error like
> > Traceback (most recent call last):
> > ? File "queue.py", line 34, in <module>
> > ? ? main()
> > ? File "queue.py", line 28, in main
> > ? ? t=MyThread(q)
> > ? File "/usr/lib/python2.5/threading.py", line 398, in __init__
> > ? ? assert group is None, "group argument must be None for now"
> > AssertionError: group argument must be None for now
>
> > can any one help me to find the reason
>
> > the code I wrote is
>
> > hosts =["http://yahoo.com", "http://google.com"]
>
> > # create a queue class
> > q=Queue.Queue()
>
> > #Thread class
> > class MyThread(threading.Thread):
> > ? ?# define __int__ method acting like constructor
> > ? ?def __int__(self,q):
>
> ? ? ? ? ? ? ? ?^^^
> ? ? ? ? ? ? ? ?Should be __init__.
>
> > ? ? ? ? ? ?threading.Thread.__init__(self)
> > ? ? ? ? ? ?self.q=q
> > ? ?def run(self):
> > ? ? ? ? ? ?h=self.q.get()
> > ? ? ? ? ? ?opens=urllib2.urlopen(h)
> > ? ? ? ? ? ?print opens.read(100)
>
> > ? ? ? ? ? ?# signal the queue to say job is done
> > ? ? ? ? ? ?self.q.task_done()
> > a=time.time()
> > def main():
> > ? ?# create a pool of thread
> > ? ?for i in range(5):
> > ? ? ? ? ? ?t=MyThread(q)
> > ? ? ? ? ? ?t.setDaemon(True)
> > ? ? ? ? ? ?t.start()
> > ? ?for h in hosts:
> > ? ? ? ? ? ?queue.put(h)
> > ? ?q.join()
> > main()
> > print "Time elasped : %s "%(time.time()-a)
>
> > The problem may be silly ,hence I'm every new to python i need your
> > guidance .
>
>

hi
It did work that way

File "queue.py", line 15
    threading.Thread__init__.(self)
                             ^
SyntaxError: invalid syntax




From deets at nospam.web.de  Tue May 12 10:11:42 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 12 May 2009 16:11:42 +0200
Subject: AssertionError - help me to solve this in a programme with Queue
References: <354106db-c900-48f4-a83f-5fa9482ecddb@x29g2000prf.googlegroups.com>
	<mailman.49.1242135267.8015.python-list@python.org>
	<cb7ee449-7102-4501-a28b-71c7eebd3b70@n7g2000prc.googlegroups.com>
Message-ID: <76te9iF1ejgblU1@mid.uni-berlin.de>

gganesh wrote:

> On May 12, 6:34?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>> gganesh wrote:
>> > Hi all,
>> > I'm just learning python ,the code below is found in one of the
>> > sites ,it produces an error like
>> > Traceback (most recent call last):
>> > File "queue.py", line 34, in <module>
>> > main()
>> > File "queue.py", line 28, in main
>> > t=MyThread(q)
>> > File "/usr/lib/python2.5/threading.py", line 398, in __init__
>> > assert group is None, "group argument must be None for now"
>> > AssertionError: group argument must be None for now
>>
>> > can any one help me to find the reason
>>
>> > the code I wrote is
>>
>> > hosts =["http://yahoo.com", "http://google.com"]
>>
>> > # create a queue class
>> > q=Queue.Queue()
>>
>> > #Thread class
>> > class MyThread(threading.Thread):
>> > # define __int__ method acting like constructor
>> > def __int__(self,q):
>>
>> ^^^
>> Should be __init__.
>>
>> > threading.Thread.__init__(self)
>> > self.q=q
>> > def run(self):
>> > h=self.q.get()
>> > opens=urllib2.urlopen(h)
>> > print opens.read(100)
>>
>> > # signal the queue to say job is done
>> > self.q.task_done()
>> > a=time.time()
>> > def main():
>> > # create a pool of thread
>> > for i in range(5):
>> > t=MyThread(q)
>> > t.setDaemon(True)
>> > t.start()
>> > for h in hosts:
>> > queue.put(h)
>> > q.join()
>> > main()
>> > print "Time elasped : %s "%(time.time()-a)
>>
>> > The problem may be silly ,hence I'm every new to python i need your
>> > guidance .
>>
>>
> 
> hi
> It did work that way
> 
> File "queue.py", line 15
>     threading.Thread__init__.(self)
>                              ^
> SyntaxError: invalid syntax

Because you messed up the .

threading.THread.__init__(self)

Please spend at least a couple of hours with the tutorial.

Diez


From philippovmi at gmail.com  Tue May 12 10:13:54 2009
From: philippovmi at gmail.com (maxim)
Date: Tue, 12 May 2009 07:13:54 -0700 (PDT)
Subject: AssertionError - help me to solve this in a programme with Queue
References: <354106db-c900-48f4-a83f-5fa9482ecddb@x29g2000prf.googlegroups.com>
	<mailman.49.1242135267.8015.python-list@python.org>
	<cb7ee449-7102-4501-a28b-71c7eebd3b70@n7g2000prc.googlegroups.com>
Message-ID: <bb4125cb-8b2f-4d4c-b6fa-738280f61260@z7g2000vbh.googlegroups.com>


> hi
> It did work that way
>
> File "queue.py", line 15
> ? ? threading.Thread__init__.(self)
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?^
> SyntaxError: invalid syntax

You've wrote right first time "threading.Thread.__init__(slef)", but
misprinted in your code "def _int_(self,q)" instead of "def __init__
(self,q)".


From google at mrabarnett.plus.com  Tue May 12 11:02:31 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 12 May 2009 16:02:31 +0100
Subject: putting date strings in order
In-Reply-To: <loom.20090512T132528-778@post.gmane.org>
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>	<7x8wl3c81i.fsf@ruckus.brouhaha.com>	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>	<4A09715E.8040908@mrabarnett.plus.com>
	<loom.20090512T132528-778@post.gmane.org>
Message-ID: <4A098F87.5060105@mrabarnett.plus.com>

John Machin wrote:
> MRAB <google <at> mrabarnett.plus.com> writes:
>> Sort the list, passing a function as the 'key' argument. The function
>> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
>> you want to have a different start month then add
> 
> and if you don't like what that produces, try subtract :-)
> 
Oops!

>> the appropriate
>> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
>> to make it wrap around (there are only 12 months in a year), returning
>> the result.
> 
Actually, subtract the start month, add 12, and then modulo 12.


From ppearson at nowhere.invalid  Tue May 12 11:45:09 2009
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 12 May 2009 15:45:09 GMT
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz>
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
	<pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <76tjs5F1ep1qiU1@mid.individual.net>

On 12 May 2009 09:35:36 GMT, Steven D'Aprano wrote:
[snip]
> To really be safe, that should become:
>
> try:
>     rsrc = get(resource)
> except ResourceError:
>     log('no more resources available')
>     raise
> else:
>     try:
>         do_something_with(rsrc)
>     finally:
>         rsrc.close()

Thanks, Steven.  I find these examples illuminating.

Not trying to be dense, but given that the "except" block
re-raises the exception, isn't the above the same as . . .?

try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available')
    raise
try:
    do_something_with(rsrc)
finally:
    rsrc.close()

-- 
To email me, substitute nowhere->spamcop, invalid->net.


From sjmachin at lexicon.net  Tue May 12 11:57:37 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 12 May 2009 08:57:37 -0700 (PDT)
Subject: putting date strings in order
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>
	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
	<4A09715E.8040908@mrabarnett.plus.com>
	<loom.20090512T132528-778@post.gmane.org> 
	<mailman.51.1242140548.8015.python-list@python.org>
Message-ID: <87ca16b5-2493-43fa-91f2-a04e545719b6@x29g2000prf.googlegroups.com>

On May 13, 1:02?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> John Machin wrote:
> > MRAB <google <at> mrabarnett.plus.com> writes:
> >> Sort the list, passing a function as the 'key' argument. The function
> >> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
> >> you want to have a different start month then add
>
> > and if you don't like what that produces, try subtract :-)
>
> Oops!
>
> >> the appropriate
> >> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
> >> to make it wrap around (there are only 12 months in a year), returning
> >> the result.
>
> Actually, subtract the start month, add 12, and then modulo 12.

Ummm ... 12 modulo 12 is a big fat zero, and Python's % is a genuine
modulo operator; unlike that of K&R C, it's defined not to go wobbly
on negatives.

| >>> [(i - 8 + 12) % 12 for i in range(12)]
| [4, 5, 6, 7, 8, 9, 10, 11, 0, 1, 2, 3]

| >>> [(i - 8     ) % 12 for i in range(12)]
| [4, 5, 6, 7, 8, 9, 10, 11, 0, 1, 2, 3]


From jaime.frio at gmail.com  Tue May 12 11:58:38 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Tue, 12 May 2009 17:58:38 +0200
Subject: putting date strings in order
In-Reply-To: <4A098F87.5060105@mrabarnett.plus.com>
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>
	<7x8wl3c81i.fsf@ruckus.brouhaha.com>
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>
	<4A09715E.8040908@mrabarnett.plus.com>
	<loom.20090512T132528-778@post.gmane.org>
	<4A098F87.5060105@mrabarnett.plus.com>
Message-ID: <97a8f1a70905120858o4f442d9cx4bb016ecff427ea0@mail.gmail.com>

On Tue, May 12, 2009 at 5:02 PM, MRAB <google at mrabarnett.plus.com> wrote:
> John Machin wrote:
>>
>> MRAB <google <at> mrabarnett.plus.com> writes:
>>>
>>> Sort the list, passing a function as the 'key' argument. The function
>>> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
>>> you want to have a different start month then add
>>
>> and if you don't like what that produces, try subtract :-)
>>
> Oops!
>
>>> the appropriate
>>> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
>>> to make it wrap around (there are only 12 months in a year), returning
>>> the result.
>>
> Actually, subtract the start month, add 12, and then modulo 12.

Both on my Linux and my Windows pythons, modulos of negative numbers
are properly taken, returning always the correct positive number
between 0 and 11. I seem to recall, from my distant past, that Perl
took pride on this being a language feature. Anyone knows if that is
not the case with python, and so not adding 12 before taking the
modulo could result in wrong results in some implementations?

> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From totobe at gmail.com  Tue May 12 11:59:29 2009
From: totobe at gmail.com (wdveloper)
Date: Tue, 12 May 2009 08:59:29 -0700 (PDT)
Subject: Call Web Service using proxy and http authentication
Message-ID: <3ebae673-2579-4589-b57a-2330c5fe9f3c@j12g2000vbl.googlegroups.com>

Hi everyone,

I am trying to call a webservice which requires an http
authentication.
To reach the ws, I must pass from a proxy http. So in the whole I need
go through two authentications before getting the ws working. I am
using SOAPpy and I'm getting quite crazy.
I am able to arrange this problem with simple http calls using urllib2
but for the ws i dont see any way out.

Does anyone knows how I can manage this stuff? Is there any better
solution or example code?

Thanks very much for your help,
totobe


From sjmachin at lexicon.net  Tue May 12 12:03:33 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 12 May 2009 09:03:33 -0700 (PDT)
Subject: Python API Functions equivalent to ruby's rb_big2str() and 
	rb_str2cstr()
References: <1553614d-4485-4b46-a779-08b4040071f8@d38g2000prn.googlegroups.com>
	<mailman.39.1242131126.8015.python-list@python.org>
	<d563c582-259d-43be-bf07-04ac6ccbcf21@k9g2000pra.googlegroups.com>
	<877i0mph2z.fsf@busola.homelinux.net>
Message-ID: <7c9961dd-3fa2-4b19-9dd4-dd3ab231d7f0@d7g2000prl.googlegroups.com>

On May 12, 11:48?pm, Hrvoje Niksic <hnik... at xemacs.org> wrote:
> rahul <rahul03... at gmail.com> writes:
> > Hi Christian,
> > ? rb_big2str(Big-Integer, base) of ruby returns string

*base*

>representation
> > of big-Integer. now, i am able to find equivalent python API function
> > of rb_str2cstr() of ruby.
>
> That would be PyLong_FromString, for the sake of later searches.
>
> > so , please help me about rb_big2str(Big-Integer, base)

*base*

> equivalent of
> > Python API function which i can use in extended module in c.
>
> You can use PyObject_Str(long_object) to convert long to string. ?No
> special function is needed.

ALL of your base are want to be convert by us -- not merely 10.



From google at mrabarnett.plus.com  Tue May 12 12:25:07 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 12 May 2009 17:25:07 +0100
Subject: putting date strings in order
In-Reply-To: <97a8f1a70905120858o4f442d9cx4bb016ecff427ea0@mail.gmail.com>
References: <2e52f7ed-c7e6-47f8-8891-f2f7ecc33cf1@x6g2000vbg.googlegroups.com>	
	<7x8wl3c81i.fsf@ruckus.brouhaha.com>	
	<d074fb1c-0fcc-4f9d-9add-e784df2df11c@o27g2000vbd.googlegroups.com>	
	<4A09715E.8040908@mrabarnett.plus.com>	
	<loom.20090512T132528-778@post.gmane.org>	
	<4A098F87.5060105@mrabarnett.plus.com>
	<97a8f1a70905120858o4f442d9cx4bb016ecff427ea0@mail.gmail.com>
Message-ID: <4A09A2E3.7090206@mrabarnett.plus.com>

Jaime Fernandez del Rio wrote:
> On Tue, May 12, 2009 at 5:02 PM, MRAB <google at mrabarnett.plus.com> wrote:
>> John Machin wrote:
>>> MRAB <google <at> mrabarnett.plus.com> writes:
>>>> Sort the list, passing a function as the 'key' argument. The function
>>>> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
>>>> you want to have a different start month then add
>>> and if you don't like what that produces, try subtract :-)
>>>
>> Oops!
>>
>>>> the appropriate
>>>> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
>>>> to make it wrap around (there are only 12 months in a year), returning
>>>> the result.
>> Actually, subtract the start month, add 12, and then modulo 12.
> 
> Both on my Linux and my Windows pythons, modulos of negative numbers
> are properly taken, returning always the correct positive number
> between 0 and 11. I seem to recall, from my distant past, that Perl
> took pride on this being a language feature. Anyone knows if that is
> not the case with python, and so not adding 12 before taking the
> modulo could result in wrong results in some implementations?
> 
Ah, yes, it's a true modulo! Nice to see that Python gets it right! :-)


From sjmachin at lexicon.net  Tue May 12 12:26:27 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 12 May 2009 09:26:27 -0700 (PDT)
Subject: putting date strings in order
References: mailman.52.1242143921.8015.python-list@python.org
Message-ID: <a276bc1e-a800-4dbc-ac77-55923ccf36c8@f1g2000prb.googlegroups.com>

On May 13, 1:58?am, Jaime Fernandez del Rio <jaime.f... at gmail.com>
wrote:
> On Tue, May 12, 2009 at 5:02 PM, MRAB <goo... at mrabarnett.plus.com> wrote:
> > John Machin wrote:
>
> >> MRAB <google <at> mrabarnett.plus.com> writes:
>
> >>> Sort the list, passing a function as the 'key' argument. The function
> >>> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
> >>> you want to have a different start month then add
>
> >> and if you don't like what that produces, try subtract :-)
>
> > Oops!
>
> >>> the appropriate
> >>> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
> >>> to make it wrap around (there are only 12 months in a year), returning
> >>> the result.
>
> > Actually, subtract the start month, add 12, and then modulo 12.
>
> Both on my Linux and my Windows pythons, modulos of negative numbers
> are properly taken, returning always the correct positive number
> between 0 and 11. I seem to recall, from my distant past, that Perl
> took pride on this being a language feature. Anyone knows if that is
> not the case with python, and so not adding 12 before taking the
> modulo could result in wrong results in some implementations?

If that happens, it's a bug.
http://docs.python.org/reference/expressions.html#binary-arithmetic-operations

If you look at function i_divmod() in the 2.x branch's Objects/
intobject.c, you'll be reassured to see that it doesn't just take
whatever C serves up :-)


From norseman at hughes.net  Tue May 12 12:37:17 2009
From: norseman at hughes.net (norseman)
Date: Tue, 12 May 2009 09:37:17 -0700
Subject: piping input to an external script
In-Reply-To: <e301dce1-fe8c-4089-aa51-97a3ded310a7@n4g2000vba.googlegroups.com>
References: <gu9pbe$csc$1@foggy.unx.sas.com>	<mailman.21.1242105403.8015.python-list@python.org>
	<81e57098-b61e-4e8b-826c-833518c8115e@r3g2000vbp.googlegroups.com>
	<mailman.23.1242109891.8015.python-list@python.org>
	<e301dce1-fe8c-4089-aa51-97a3ded310a7@n4g2000vba.googlegroups.com>
Message-ID: <4A09A5BD.2060401@hughes.net>

Steve Howell wrote:
> On May 11, 11:31 pm, norseman <norse... at hughes.net> wrote:
>> Steve Howell wrote:
>>> On May 11, 10:16 pm, norseman <norse... at hughes.net> wrote:
>>>> Tim Arnold wrote:
>>>>> Hi, I have some html files that I want to validate by using an external
>>>>> script 'validate'. The html files need a doctype header attached before
>>>>> validation. The files are in utf8 encoding. My code:
>>>>> ---------------
>>>>> import os,sys
>>>>> import codecs,subprocess
>>>>> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
>>>>> filename  = 'mytest.html'
>>>>> fd = codecs.open(filename,'rb',encoding='utf8')
>>>>> s = HEADER + fd.read()
>>>>> fd.close()
>>>>> p = subprocess.Popen(['validate'],
>>>>>                     stdin=subprocess.PIPE,
>>>>>                     stdout=subprocess.PIPE,
>>>>>                     stderr=subprocess.STDOUT)
>>>>> validate = p.communicate(unicode(s,encoding='utf8'))
>>>>> print validate
>>>>> ---------------
>>>>> I get lots of lines like this:
>>>>> Error at line 1, character 66:\tillegal character number 0
>>>>> etc etc.
>>>>> But I can give the command in a terminal 'cat mytest.html | validate' and
>>>>> get reasonable output. My subprocess code must be wrong, but I could use
>>>>> some help to see what the problem is.
>>>>> python2.5.1, freebsd6
>>>>> thanks,
>>>>> --Tim
>>>> ============================
>>>> If you search through the recent Python-List for UTF-8 things you might
>>>> get the same understanding I have come to.
>>>> the problem is the use of python's 'print' subcommand or what ever it
>>>> is. It 'cooks' things and someone decided that it would only handle 1/2
>>>> of a byte (in the x'00 to x'7f' range) and ignore or send error messages
>>>> against anything else. I guess the person doing the deciding read the
>>>> part that says ASCII printables are in the 7 bit range and chose to
>>>> ignore the part about the rest of the byte being undefined. That is
>>>> undefined, not disallowed.  Means the high bit half can be used as
>>>> wanted since it isn't already taken. Nor did whoever it was take a look
>>>> around the computer world and realize the conflict that was going to be
>>>> generated by using only 1/2 of a byte in a 1byte+ world.
>>>> If you can modify your code to use read and write you can bypass print
>>>> and be OK.  Or just have python do the 'cat mytest.html | validate' for
>>>> you. (Apply a var for html and let python accomplish the the equivalent
>>>> of Unix's:
>>>>     for f in *.html; do cat $f | validate; done
>>>>                          or
>>>>      for f in *.html; do validate $f; done  #file name available this way
>>>> If you still have problems, take a look at os.POPEN2 (and its popen3)
>>>> Also take look at os.spawn.. et al
>>> Wow.  Unicode and subprocessing and printing can have dark corners,
>>> but common sense does apply in MOST situations.
>>> If you send the header, add the newline.
>>> But you do not need the header if you can cat the input file sans
>>> header and get sensible input.
>> Yep!  The problem is with 'print'
>>
> 
> Huh?  Print is printing exactly what you expect it to print.
> 
===============
My apologies.

Tim: Using what you posted;
Is the third char of the first line read from file a TAB?

Just curious.  len(HEADER) is 63, error at 66  char number 0, doesn't 
seem quite consistent math wise.
63 + cr + lf gives 65.  But, as another noted, you don't have those.
"...66:\tillegal..."  is '\t' a tab on screen or byte 1 or 3 of file?
If you have mc available, in it - highlight file and press Shift-F3 then 
F4.  09 is TAB

</title> is closing, should not exist as opener
<html>   can be opener, did the h somehow become a '\'
          (still - that would put x'09' at byte 2 of file)

Most validate programs I have used will let me know the header is 
missing if in fact it is and give me a choice of how to process (XML, 
XHTML, HTML 1.1, ...) or quit.

is HEADER ('<!DOC...>') itself already in utf-8?
Or are you mixing things?

Last but not least - if you have source of validate process, check that 
over carefully.  The numbers don't work for me.

Just thinking on paper. No need to respond.

Steve


From tim.arnold at sas.com  Tue May 12 12:46:47 2009
From: tim.arnold at sas.com (Tim Arnold)
Date: Tue, 12 May 2009 12:46:47 -0400
Subject: piping input to an external script
References: <gu9pbe$csc$1@foggy.unx.sas.com>
	<mailman.25.1242113076.8015.python-list@python.org>
Message-ID: <guc95n$efo$1@foggy.unx.sas.com>

"Dave Angel" <davea at ieee.org> wrote in message 
news:mailman.25.1242113076.8015.python-list at python.org...
> Tim Arnold wrote:
>> Hi, I have some html files that I want to validate by using an external 
>> script 'validate'. The html files need a doctype header attached before 
>> validation. The files are in utf8 encoding. My code:
>> ---------------
>> import os,sys
>> import codecs,subprocess
>> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 
>> Transitional//EN">'
>>
>> filename  = 'mytest.html'
>> fd = codecs.open(filename,'rb',encoding='utf8')
>> s = HEADER + fd.read()
>> fd.close()
>>
>> p = subprocess.Popen(['validate'],
>>                     stdin=subprocess.PIPE,
>>                     stdout=subprocess.PIPE,
>>                     stderr=subprocess.STDOUT)
>> validate = p.communicate(unicode(s,encoding='utf8'))
>> print validate
>> ---------------
>>
>> I get lots of lines like this:
>> Error at line 1, character 66:\tillegal character number 0
>> etc etc.
>>
>> But I can give the command in a terminal 'cat mytest.html | validate' and 
>> get reasonable output. My subprocess code must be wrong, but I could use 
>> some help to see what the problem is.
>>
>> python2.5.1, freebsd6
>> thanks,
>> --Tim
>>
>>
>>
>>
> The usual rule in debugging:  split the problem into two parts, and test 
> each one separately, starting with the one you think most likely to be the 
> culprit
>
> In this case the obvious place to split is with the data you're passing to 
> the  communicate call.  I expect it's already wrong, long before you hand 
> it to the subprocess.  So write it to a file instead, and inspect it with 
> a binary file viewer.  And of course test it manually with your validate 
> program.  Is validate really expecting a Unicode stream in stdin ?
>

Good advice from everyone. The example was simpler than my actual situation, 
but it did show the problem. Dave's final question was the right one: I 
needed to pass the html content as a string, not unicode object:

HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">\n'

filename  = 'mytest.html'
fd = codecs.open(filename,'rb',encoding='utf8')
s = HEADER + fd.read().encode('utf8') # <- made the difference
fd.close()

p = subprocess.Popen(['validate',],
                    stdin=subprocess.PIPE,
                    stdout=subprocess.PIPE,
                    stderr=subprocess.STDOUT)
validate = p.communicate(s)
print validate





From mensanator at aol.com  Tue May 12 12:49:38 2009
From: mensanator at aol.com (Mensanator)
Date: Tue, 12 May 2009 09:49:38 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
	<4519cc9d-f765-4f55-81b2-58abfa20b988@p4g2000vba.googlegroups.com> 
	<49c224c0-1f58-4ff9-965c-a12f0aa26276@m24g2000vbp.googlegroups.com>
Message-ID: <ebc2a31b-02b8-4671-95bb-29cac0e412c3@s21g2000vbb.googlegroups.com>

On May 12, 8:27?am, rump... at web.de wrote:
> > > > The language and library are missing arbitrary precision integer
> > > > arithmetic, using GMP or something like that.
>
> > > True, but currently not a high priority for me.
>
> > Too bad. That makes Nimrod officially "worthless", i.e., of no
> > value to me.
>
> Well, you could write a wrapper for GMP (and contribute to the
> project ;-)).

But such a thing already exists in Python. And I spend my time
USING arbitrary precision numbers to do math research.

Just thought you'ld like to be aware that some people actually
make their language choices based on the availability (and
performance)
of arbitrary precision numbers.


From norseman at hughes.net  Tue May 12 13:17:58 2009
From: norseman at hughes.net (norseman)
Date: Tue, 12 May 2009 10:17:58 -0700
Subject: No subject
In-Reply-To: <452312.52363.qm@web45506.mail.sp1.yahoo.com>
References: <452312.52363.qm@web45506.mail.sp1.yahoo.com>
Message-ID: <4A09AF46.4030405@hughes.net>

karlos barlos wrote:
> hello to all 
> 
> i have been using this script to add users to my active directory structure
> 
> i wise to make a loop in order for it to run for A large Number of Users 
> 
> can anyone give me some advice on the loop ??
> 
> 
> 
> import win32com,win32com.client
> def add_acct(location,account):
>     
>   ad_obj=win32com.client.GetObject(location)
>   ad_user=ad_obj.Create('user','cn='+user['login'])
>   ad_user.Put('sAMAccountName',user['login'])
>   ad_user.Put('userPrincipalName',user['login']+'@email.address.com')
>   ad_user.Put('DisplayName',user['last']+' '+user['first']) #fullname
>   ad_user.Put('givenName',user['first'])
>   ad_user.Put('sn',user['last'])
>   ad_user.Put('description','regular account')
>   ad_user.Put('physicalDeliveryOfficeName','office 1')
>   ad_user.Put('HomeDirectory',r'\\server1\ '[:-1]+user['login']) 
>   ad_user.Put('HomeDrive','H:')
>   ad_user.SetInfo();ad_user.GetInfo()
>   ad_user.LoginScript='login.bat'
>   ad_user.AccountDisabled=0
>   ad_user.setpassword('the password')
>   ad_user.Put('pwdLastSet',0) #-- force reset of password
>   ad_user.SetInfo()
> 
> 
> location='LDAP://OU=sales,DC=shay,DC=com'
> user={'first':'shay','last':'smith','login':'shay123'}
> add_acct(location,user)
> 
> 
> location='LDAP://OU=sales,DC=shay,DC=com'
                             DC=ron  yes?
> user={'first':'ron','last':'smith','login':'ron1267'}
> add_acct(location,user)
> 
> 
> 
> 
>       
> 
=======================================
.
.
def add_acct(location,account):
  OK



presumably you are reading from a list of names in a file
names= open(..)
Now you need a loop
for name in names:
   the location=  needs a variable in place of shay ('name' in this case)
   user=  this needs more explanation from you
          seems to be an attempt at alphabetizing
          if so:  presort the file with list of names
                or better yet
                  just read them in and sort entire list afterwards to
                  final file or python list (see python index)
   add name to listTemp
for user in list already existing:
   add user to listTemp
for user in list.Temp.index():
   copy to ListSorted
   reset first/last as needed
for user in ListSorted:
   store it someplace  (like your data file)


I suspect some of the add_.. function will need some mods, but maybe not
If 'shay123' is line number, track it in 'copy to ListSorted' section.
If the number is user id, assign it in source file.
(name id     1 pair per line, adjust read,etc to accommodate)

Today is: 20090512
no code this section

Steve


From showell30 at yahoo.com  Tue May 12 13:24:32 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 12 May 2009 10:24:32 -0700 (PDT)
Subject: piping input to an external script
References: <gu9pbe$csc$1@foggy.unx.sas.com>
Message-ID: <1f55d5bc-d9c9-4ed8-99e7-e0317b8e3047@v1g2000prd.googlegroups.com>

See suggested debugging tip inline of your program....

On May 11, 11:04?am, "Tim Arnold" <tim.arn... at sas.com> wrote:
> Hi, I have some html files that I want to validate by using an external
> script 'validate'. The html files need a doctype header attached before
> validation. The files are in utf8 encoding. My code:
> ---------------
> import os,sys
> import codecs,subprocess
> HEADER = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">'
>
> filename ?= 'mytest.html'
> fd = codecs.open(filename,'rb',encoding='utf8')
> s = HEADER + fd.read()

# Try inserting lines like below, to see what characters are actually
near char 66.
print '---'
print repr(s[65])
print repr(s[66])
print repr(s[:70])
print repr(unicode(s,encoding='utf8')[:70])
print '---'

> fd.close()
>
> p = subprocess.Popen(['validate'],
> ? ? ? ? ? ? ? ? ? ? stdin=subprocess.PIPE,
> ? ? ? ? ? ? ? ? ? ? stdout=subprocess.PIPE,
> ? ? ? ? ? ? ? ? ? ? stderr=subprocess.STDOUT)
> validate = p.communicate(unicode(s,encoding='utf8'))
> print validate
> ---------------
>
> I get lots of lines like this:
> Error at line 1, character 66:\tillegal character number 0
> etc etc.
>

See above, it's pretty easy to see what the 66th character of "s" is.

> But I can give the command in a terminal 'cat mytest.html | validate' and
> get reasonable output. My subprocess code must be wrong, but I could use
> some help to see what the problem is.
>

Your disconnect is that in your program you are NOT actually
simulating the sending of mytest.html to the validate program, so you
are comparing apples and oranges.

The fact that you can send mytest.html to the validate program without
a header from the shell suggest to me that it is equally unnecessary
in your Python program, or maybe you just haven't thought through what
you're really trying to accomplish here.



From george.sakkis at gmail.com  Tue May 12 13:54:23 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Tue, 12 May 2009 10:54:23 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
	<4519cc9d-f765-4f55-81b2-58abfa20b988@p4g2000vba.googlegroups.com> 
	<49c224c0-1f58-4ff9-965c-a12f0aa26276@m24g2000vbp.googlegroups.com> 
	<ebc2a31b-02b8-4671-95bb-29cac0e412c3@s21g2000vbb.googlegroups.com>
Message-ID: <4bbb12e3-fe7f-40e9-aa24-1cc6c4175a8b@d19g2000prh.googlegroups.com>

On May 12, 12:49?pm, Mensanator <mensana... at aol.com> wrote:
> On May 12, 8:27?am, rump... at web.de wrote:
>
> > > > > The language and library are missing arbitrary precision integer
> > > > > arithmetic, using GMP or something like that.
>
> > > > True, but currently not a high priority for me.
>
> > > Too bad. That makes Nimrod officially "worthless", i.e., of no
> > > value to me.
>
> > Well, you could write a wrapper for GMP (and contribute to the
> > project ;-)).
>
> But such a thing already exists in Python. And I spend my time
> USING arbitrary precision numbers to do math research.
>
> Just thought you'ld like to be aware that some people actually
> make their language choices based on the availability (and
> performance)
> of arbitrary precision numbers.

I'm sure developers of a new language have to deal with much more
pressing issues before accommodating each and every self important
niche.


From namekuseijin at gmail.com  Tue May 12 13:54:59 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Tue, 12 May 2009 10:54:59 -0700 (PDT)
Subject: how to consume .NET webservice
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net> 
	<76rnq5F1dp6gpU1@mid.uni-berlin.de>
	<guaf4j$1fsn$1@adenine.netfront.net> 
	<76slqnF1ehacbU1@mid.uni-berlin.de>
Message-ID: <bb084afa-4a8a-4bf6-8786-35c6531d4ff8@j12g2000vbl.googlegroups.com>

On May 12, 4:12?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> namekuseijin schrieb:
> ?> Diez B. Roggisch wrote:
> ?>> namekuseijin schrieb:
> ?>>> bav escreveu:
> ?>>>> question from a python newbie;
> ?>>>>
> ?>>>> ? how can i consume in python language, a .NET web service, passing
> ?>>>> ? a string array as parameter in some easy steps?
> ?>>>
> ?>>> Unless Microsoft extended the standard in any way, then it should
> be just as you consume any web service, I guess. ;)
> ?>>
> ?>> Microsoft *created* the standard..
> ?>
> ?> No:
>
> Yes:
>
> http://webservices.xml.com/pub/a/ws/2001/04/04/soap.html

You are right, sorry.

> MS created it. That it *became* a standard of the W3C later - well, they
> did that with OOXML as well...

OpenOfficeXML document format AKA ODF? ;)


From kyosohma at gmail.com  Tue May 12 14:01:40 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 12 May 2009 11:01:40 -0700 (PDT)
Subject: how to consume .NET webservice
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net> 
	<76rnq5F1dp6gpU1@mid.uni-berlin.de>
	<guaf4j$1fsn$1@adenine.netfront.net> 
	<76slqnF1ehacbU1@mid.uni-berlin.de>
	<bb084afa-4a8a-4bf6-8786-35c6531d4ff8@j12g2000vbl.googlegroups.com>
Message-ID: <e857b604-12b5-4b44-a42d-11a65ceecb50@q14g2000vbn.googlegroups.com>

On May 12, 12:54?pm, namekuseijin <namekusei... at gmail.com> wrote:
> On May 12, 4:12?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
>
>
> > namekuseijin schrieb:
> > ?> Diez B. Roggisch wrote:
> > ?>> namekuseijin schrieb:
> > ?>>> bav escreveu:
> > ?>>>> question from a python newbie;
> > ?>>>>
> > ?>>>> ? how can i consume in python language, a .NET web service, passing
> > ?>>>> ? a string array as parameter in some easy steps?
> > ?>>>
> > ?>>> Unless Microsoft extended the standard in any way, then it should
> > be just as you consume any web service, I guess. ;)
> > ?>>
> > ?>> Microsoft *created* the standard..
> > ?>
> > ?> No:
>
> > Yes:
>
> >http://webservices.xml.com/pub/a/ws/2001/04/04/soap.html
>
> You are right, sorry.
>
> > MS created it. That it *became* a standard of the W3C later - well, they
> > did that with OOXML as well...
>
> OpenOfficeXML document format AKA ODF? ;)

No...Office Open XML, which is used in Microsoft Office 2007 and which
Microsoft rammed through the ISO: http://en.wikipedia.org/wiki/Office_Open_XML

- Mike


From mrstevegross at gmail.com  Tue May 12 14:33:02 2009
From: mrstevegross at gmail.com (mrstevegross)
Date: Tue, 12 May 2009 11:33:02 -0700 (PDT)
Subject: How to abort module evaluation?
Message-ID: <7c3885ec-41f3-469e-a5a6-7c7ebb5cc939@u10g2000vbd.googlegroups.com>

I have a python script that is pretty simple: when executed, it
imports a bunch of stuff and then runs some logic. When *imported*, it
defines some variables and exits. Here's what it looks like:

=== foo.py ===
if __name__ != '__main__':
  x = 1
  exit_somehow

import bar
do_some_stuff...
=== EOF ===

There's a problem, though. On line 3, I wrote "exit_somehow".
Actually, I have no idea how to do that part. Is there some way I can
get python to abandon processing the rest of the script at that point?
I know goto doesn't exist, so that's not an option... sys.exit() won't
work, because that will abort the entire python interpreter, rather
than just the evaluation of the module.

Thanks,
--Steve


From showell30 at yahoo.com  Tue May 12 14:38:02 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 12 May 2009 11:38:02 -0700 (PDT)
Subject: Call Web Service using proxy and http authentication
References: <3ebae673-2579-4589-b57a-2330c5fe9f3c@j12g2000vbl.googlegroups.com>
Message-ID: <f8e3d564-b19f-4767-b4cb-b7dfcb86ecca@j18g2000prm.googlegroups.com>

On May 12, 8:59?am, wdveloper <tot... at gmail.com> wrote:
> Hi everyone,
>
> I am trying to call a webservice which requires an http
> authentication.
> To reach the ws, I must pass from a proxy http. So in the whole I need
> go through two authentications before getting the ws working. I am
> using SOAPpy and I'm getting quite crazy.
> I am able to arrange this problem with simple http calls using urllib2
> but for the ws i dont see any way out.
>
> Does anyone knows how I can manage this stuff? Is there any better
> solution or example code?
>

Your high level description of the problem is good, but I think you'll
get more help if you provide a little more detail.

For something like this you may want to try to do more at the HTTP
level, where you have a little more control over the authentication,
and then find a way to hook into SOAPpy just to build and parse the
payloads.

How good is your understanding of HTTP?  Do you know the basics of how
headers work?  You might want to brush up a little on HTTP just to
help understand what's going on; it will almost certainly be valuable
for future projects as well.

To understand how the proxy works in particular, if you can use the
proxy to access a normal html-serving website, you can use the "Live
HTTP Headers" tool under Firefox to see what's going on.

But before all that, I would maybe just post a little more detail on
the problem.  Maybe show code you've written so far, and any error
messages/tracebacks, to better indicate where you are stuck.



From namekuseijin at gmail.com  Tue May 12 14:41:48 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Tue, 12 May 2009 11:41:48 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org>
Message-ID: <c3cd739e-d5e7-462f-8625-81809a7fafd3@o30g2000vbc.googlegroups.com>

On May 8, 12:48?pm, Andreas Rumpf <Rump... at web.de> wrote:
> Dear Python-users,
>
> I invented a new programming language called "Nimrod" that combines Python's readability with C's performance. Please check it out:http://force7.de/nimrod/
> Any feedback is appreciated.

heh, looks more like a streamlined Object Pascal (i.e class
declarations) than Python.  And indeed I see that it has a nice bridge
to old Object Pascal code.

OTOH, Python always felt to me very close to Pascal in the choice of
syntax keywords and readability.  Some people of late have been
comparing Python to Basic, but I guess that's only to widespread it
more among the american public, where Pascal as foreign tech never
quite grasped foot.


From piet at cs.uu.nl  Tue May 12 14:52:35 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Tue, 12 May 2009 20:52:35 +0200
Subject: Wrapping comments
References: <towb-EA7906.14423909052009@news.individual.de>
	<K8ydnaPzmfVQEpjXnZ2dnUVZ_gqdnZ2d@pdx.net>
	<towb-445608.21342209052009@news.individual.de>
	<m2bpq2ngup.fsf@googlemail.com>
	<towb-63CE3D.09322210052009@news.individual.de>
	<mailman.5400.1242000728.11746.python-list@python.org>
	<slrnh0fqu4.qcl.nick@irishsea.home.craig-wood.com>
	<gubl1l$nov$4@lust.ihug.co.nz>
Message-ID: <m2ws8mb1cc.fsf@cs.uu.nl>

>>>>> Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> (LD) wrote:

>LD> In message <slrnh0fqu4.qcl.nick at irishsea.home.craig-wood.com>, Nick Craig-
>LD> Wood wrote:

>>> Rhodri James <rhodri at wildebst.demon.co.uk> wrote:
>>> 
>>>> Emacs is my editor of choice ...
>>> 
>>> You probably haven't used MAC OS X then!

>LD> I tried using Emacs via SSH from a Mac once. Made me run screaming for the 
>LD> nearest Windows box 

The standard Windows box doesn't even have SSH AFAIK.

I edit remote files on my local Emacs on Mac OS X with tramp,
certainly when they are on a SSH-accessible machine.
Works like a charm.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From starsareblueandfaraway at gmail.com  Tue May 12 14:55:16 2009
From: starsareblueandfaraway at gmail.com (Roy Hyunjin Han)
Date: Tue, 12 May 2009 14:55:16 -0400
Subject: confused with subprocess.Popen
In-Reply-To: <f6a09c160905092237h336368c1od45eda6668d9b1e@mail.gmail.com>
References: <f6a09c160905080112x2620169fk9249e9469be607ea@mail.gmail.com>
	<4A064847.4080509@mattnordhoff.com>
	<f6a09c160905092237h336368c1od45eda6668d9b1e@mail.gmail.com>
Message-ID: <6a5569ec0905121155p7fb09cbfi2936cae0cc9374b0@mail.gmail.com>

There's a great article by Doug Hellmann on subprocess.
http://www.doughellmann.com/PyMOTW/subprocess/

On Sun, May 10, 2009 at 1:37 AM, Soumen banerjee <soumen08 at gmail.com> wrote:
> Thanks!, i have found that alternately setting shell=True also works
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From saddor at gmail.com  Tue May 12 15:05:41 2009
From: saddor at gmail.com (Cesar D. Rodas)
Date: Tue, 12 May 2009 15:05:41 -0400
Subject: Language detector using N-grams
Message-ID: <239036620905121205l2815c02cu48730dbaa1e66863@mail.gmail.com>

Hello Pythoners!

I just finished my first useful project in Python, It is a language
detector using N-grams. I hope this can be useful for someone,

http://github.com/crodas/py-languess/tree/master

The License of the project is BSD

Best regards

-- 
Cesar D. Rodas
http://cesar.la/
Phone: +595-961-974165
Jay Leno  - "Don't forget Mother's Day. Or as they call it in Beverly
Hills, Dad's Third Wife Day." -
http://www.brainyquote.com/quotes/authors/j/jay_leno.html


From nick at craig-wood.com  Tue May 12 15:30:04 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Tue, 12 May 2009 14:30:04 -0500
Subject: issue with twisted and reactor. Can't stop reactor
References: <20090511220919.21531.119723250.divmod.quotient.19655@henry.divmod.com>
	<mailman.11.1242082327.8015.python-list@python.org>
Message-ID: <slrnh0jgeu.ee.nick@irishsea.home.craig-wood.com>

Gabriel <gabriel at opensuse.org> wrote:
>  Jean-Paul Calderone escribi?:
>  > None of the reactors in Twisted are restartable.  You can run and
>  stop them
> > once.  After you've stopped a reactor, you cannot run it again.  This is
> > the
> > cause of your problem.
> > 
> > Jean-Paul
> 
>  I see.
>  Is it possible to do what I want using twisted? or
>  I should found another way?

You have to go twisted...

Your program should call reactor.run() once and everything you need
your program to do should be started off from twisted callbacks (eg
timer callbacks or deferred objects).

To get your program to do something immediately after it is started,
use reactor.callLater() before calling reactor.run().

You can't mix and match programming styles with twisted - it is all
asynchronous callbacks or nothing in my experience!  That takes a bit
of getting your head round at first.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From kyosohma at gmail.com  Tue May 12 15:38:34 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 12 May 2009 12:38:34 -0700 (PDT)
Subject: How to abort module evaluation?
References: <7c3885ec-41f3-469e-a5a6-7c7ebb5cc939@u10g2000vbd.googlegroups.com>
Message-ID: <ad9fa251-d6b0-40f5-bc69-fa92f8278d9f@g20g2000vba.googlegroups.com>

On May 12, 1:33?pm, mrstevegross <mrstevegr... at gmail.com> wrote:
> I have a python script that is pretty simple: when executed, it
> imports a bunch of stuff and then runs some logic. When *imported*, it
> defines some variables and exits. Here's what it looks like:
>
> === foo.py ===
> if __name__ != '__main__':
> ? x = 1
> ? exit_somehow
>
> import bar
> do_some_stuff...
> === EOF ===
>
> There's a problem, though. On line 3, I wrote "exit_somehow".
> Actually, I have no idea how to do that part. Is there some way I can
> get python to abandon processing the rest of the script at that point?
> I know goto doesn't exist, so that's not an option... sys.exit() won't
> work, because that will abort the entire python interpreter, rather
> than just the evaluation of the module.
>
> Thanks,
> --Steve

Isn't abandoning the processing of the rest of the script exiting the
script? You could use "return" or wrap the offending code in a try/
except block and do something on an exception...

Mike


From totobe at gmail.com  Tue May 12 15:51:37 2009
From: totobe at gmail.com (wdveloper)
Date: Tue, 12 May 2009 12:51:37 -0700 (PDT)
Subject: Call Web Service using proxy and http authentication
References: <3ebae673-2579-4589-b57a-2330c5fe9f3c@j12g2000vbl.googlegroups.com>
	<f8e3d564-b19f-4767-b4cb-b7dfcb86ecca@j18g2000prm.googlegroups.com>
Message-ID: <ebab040f-f2e4-4387-8da6-d568b865785a@o27g2000vbd.googlegroups.com>

On May 12, 8:38?pm, Steve Howell <showel... at yahoo.com> wrote:
> On May 12, 8:59?am, wdveloper <tot... at gmail.com> wrote:
>
> > Hi everyone,
>
> > I am trying to call a webservice which requires an http
> > authentication.
> > To reach the ws, I must pass from a proxy http. So in the whole I need
> > go through two authentications before getting the ws working. I am
> > using SOAPpy and I'm getting quite crazy.
> > I am able to arrange this problem with simple http calls using urllib2
> > but for the ws i dont see any way out.
>
> > Does anyone knows how I can manage this stuff? Is there any better
> > solution or example code?
>
> Your high level description of the problem is good, but I think you'll
> get more help if you provide a little more detail.
>
> For something like this you may want to try to do more at the HTTP
> level, where you have a little more control over the authentication,
> and then find a way to hook into SOAPpy just to build and parse the
> payloads.
>
> How good is your understanding of HTTP? ?Do you know the basics of how
> headers work? ?You might want to brush up a little on HTTP just to
> help understand what's going on; it will almost certainly be valuable
> for future projects as well.
>
> To understand how the proxy works in particular, if you can use the
> proxy to access a normal html-serving website, you can use the "Live
> HTTP Headers" tool under Firefox to see what's going on.
>
> But before all that, I would maybe just post a little more detail on
> the problem. ?Maybe show code you've written so far, and any error
> messages/tracebacks, to better indicate where you are stuck.

Thank you very much Steve,

I do have a good understanding of http and its headers rules, and of
course I can work on that.
On the other hand, I am new to python and SOAPpy toolkit and I dont
have much of an experience working with ws in general.

When it comes of working with simple call to WS, everything is
successfull; problems start cause I dont know how to use the toolkit
to compose the http request. I should code it in the way that it
connects to my proper proxy and it gets authenticated in the server
exposing the service.

What I have is something like:
from SOAPpy import WSDL

wsdl = 'http://myws?wsdl'
my_http_proxy = '10.x.x.x:8080'
proxy = WSDL.Proxy(wsdl, http_proxy=my_http_proxy)
res = proxy.myService( myparam='...' )

What I get is that connection reaches timeout since the server doesnt
see me coming from the right proxy.
First problem, I can't see where I can put my proxy authentication
username and password.
Second, when I will be able to pass through the right proxy, I need to
authenticate on the server via http through my credential.

I am starting wondering whether python+SOAPpy is the right solution or
I need to switch to other solutions (zsi?).

I hope I've been more detailed now and my situation sounds little more
clear.
Thanks again for your precious help!


From aahz at pythoncraft.com  Tue May 12 16:15:28 2009
From: aahz at pythoncraft.com (Aahz)
Date: 12 May 2009 13:15:28 -0700
Subject: Fill Javascript form
References: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>
Message-ID: <gucld0$qqm$1@panix3.panix.com>

In article <3f9c74cf-72f4-45e2-8724-3939366d13bf at e24g2000vbe.googlegroups.com>,
Matteo  <tadwelessar at gmail.com> wrote:
>
>I have to fill a web form to authenticate and connect to the internet.
>I thought it would have been easy to make a script to do that
>automatically on startup.
>
>Unfortunately, it turned out that the form is written in JavaScript,
>and urllib2 therefore fails to even fetch the form.

Depending on whether you can reverse-engineer the form, you can either
just POST data to the webserver or you need to access a JavaScript
library.  Selenium might be an answer to the latter problem; you could
also look into using WebKit.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From dervonb at gmail.com  Tue May 12 16:20:48 2009
From: dervonb at gmail.com (dervonb at gmail.com)
Date: Tue, 12 May 2009 13:20:48 -0700 (PDT)
Subject: Looking for teacher in New York
Message-ID: <08dd3dd8-bfa4-42cb-ab3a-fb34acf0a7ec@t11g2000vbc.googlegroups.com>

I live in brooklyn i'm looking for someone who can help a group of two
or three learn how to use python.
to create games useful softwares and very high level coding
eventually.
in other words how to abuse it's talents for our greater good.

Please respond if you can meet in the brooklyn, manhattan, queens
area.
Please respond if you have info about cheap classes


From exarkun at divmod.com  Tue May 12 16:33:06 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Tue, 12 May 2009 16:33:06 -0400
Subject: issue with twisted and reactor. Can't stop reactor
In-Reply-To: <slrnh0jgeu.ee.nick@irishsea.home.craig-wood.com>
Message-ID: <20090512203306.21531.1369516399.divmod.quotient.20029@henry.divmod.com>

On Tue, 12 May 2009 14:30:04 -0500, Nick Craig-Wood <nick at craig-wood.com> wrote:
>Gabriel <gabriel at opensuse.org> wrote:
>>  Jean-Paul Calderone escribi?:
>>  > None of the reactors in Twisted are restartable.  You can run and
>>  stop them
>> > once.  After you've stopped a reactor, you cannot run it again.  This is
>> > the
>> > cause of your problem.
>> >
>> > Jean-Paul
>>
>>  I see.
>>  Is it possible to do what I want using twisted? or
>>  I should found another way?
>
>You have to go twisted...
>
>Your program should call reactor.run() once and everything you need
>your program to do should be started off from twisted callbacks (eg
>timer callbacks or deferred objects).
>
>To get your program to do something immediately after it is started,
>use reactor.callLater() before calling reactor.run().

reactor.callWhenRunning can also be used (instead of callLater with a very
short delay).

You can also set stuff up first, /then/ call reactor.run().  eg, it is
completely fine to write:

    reactor.connectTCP(...)
    reactor.run()

Jean-Paul


From walterbyrd at iname.com  Tue May 12 16:39:08 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Tue, 12 May 2009 13:39:08 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
Message-ID: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>

I have about 150 unix formated text files that I would like to convert
to dos formated.

I am guessing that I loop though each file in the directory, read each
line and conver the last character, then save to a file with the same
name in another directory.

I am not really sure what I convert the last charactor to.


From deets at nospam.web.de  Tue May 12 16:49:04 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 12 May 2009 22:49:04 +0200
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
Message-ID: <76u5m0F1f1u7pU1@mid.uni-berlin.de>

walterbyrd schrieb:
> I have about 150 unix formated text files that I would like to convert
> to dos formated.
> 
> I am guessing that I loop though each file in the directory, read each
> line and conver the last character, then save to a file with the same
> name in another directory.
> 
> I am not really sure what I convert the last charactor to.

Use recode.

Diez


From google at mrabarnett.plus.com  Tue May 12 16:53:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 12 May 2009 21:53:59 +0100
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
Message-ID: <4A09E1E7.9090001@mrabarnett.plus.com>

walterbyrd wrote:
> I have about 150 unix formated text files that I would like to convert
> to dos formated.
> 
> I am guessing that I loop though each file in the directory, read each
> line and conver the last character, then save to a file with the same
> name in another directory.
> 
> I am not really sure what I convert the last charactor to.

The quickest and OS-agnostic way would be:

     text = open(path, "U").read()
     text = text.replace("\n", "\r\n")
     open(path, "wb").write(text)

That way it doesn't matter if the text file is already dos formatted.


From pavlovevidence at gmail.com  Tue May 12 17:04:41 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 12 May 2009 14:04:41 -0700 (PDT)
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz> 
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
	<pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <b5a92d87-a4ec-46ca-86c0-8b7f3b48cafe@o20g2000vbh.googlegroups.com>

On May 12, 2:35?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Tue, 12 May 2009 09:20:36 +0000, Steven D'Aprano wrote:
> > On Tue, 12 May 2009 20:23:25 +1200, Lawrence D'Oliveiro wrote:
>
> >> In message <gu7f97$mt... at reader1.panix.com>, kj wrote:
>
> >>> I know about the construct:
>
> >>> try:
> >>> ? ? # do something
> >>> except ...:
> >>> ? ? # handle exception
> >>> else:
> >>> ? ? # do something else
>
> >>> ...but I can't come with an example in which the same couldn't be
> >>> accomplished with [no else]
>
> >> I'd agree. If you have to resort to a "try .. else", then might I
> >> respectfully suggest that you're using exceptions in a way that's
> >> complicated enough to get you into trouble.
>
> > try:
> > ? ? rsrc = get(resource)
> > except ResourceError:
> > ? ? log('no more resources available')
> > ? ? raise
> > else:
> > ? ? do_something_with(rsrc)
> > finally:
> > ? ? rsrc.close()
>
> Except of course such a pattern won't work, because if get(resource)
> fails, rsrc will not exist to be closed. So a better, and simpler,
> example would be to drop the finally clause:

Resource acquisition goes outside the try block.  If you want to log
an error, then get() goes inside its own try block.

try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available')
    raise
try:
    do_something_with(rsrc)
finally:
    rsrc.close()


If you hadn't reraised the exception, then the else clause would have
been useful as follows:

try:
    rsrc = get(resource)
except ResourceError:
    proceed_without_resource()
else:
    try:
        proceed_with_resource()
        # Note: proceed_with_resource() can possibly raise
        # ResourceError itself
    finally:
        rsrc.close()

The main reason for the else clause on try blocks is so that you don't
risk catching spurrious exceptions.  You could stick
proceed_with_resource() in the try clause, but then if
proceed_with_resource() throws ResourceError because it tries to
acquire a different resource and fails, then it'd be caught and
proceed_without_resource() would be called, which is a mistake.

In general, you want to limit the contents of a try clause to code
that throws an exception you want to catch (if you're trying to catch
an exception); everything else should go into the else clause.

Incidentally, I can't think of any realistic use cases for using all
four of try...except...else...finally.


Carl Banks


From gdamjan at gmail.com  Tue May 12 17:10:33 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Tue, 12 May 2009 23:10:33 +0200
Subject: Fill Javascript form
References: <3f9c74cf-72f4-45e2-8724-3939366d13bf@e24g2000vbe.googlegroups.com>
	<mailman.3.1242076014.8015.python-list@python.org>
	<a91b7799-953e-4751-b18b-791b1a378794@l28g2000vba.googlegroups.com>
Message-ID: <975pd6-npd.ln1@archaeopteryx.softver.org.mk>



> On 11 Mag, 23:06, Shawn Milochik <Sh... at Milochik.com> wrote:
>> How is the form "written in JavaScript"? Is it dynamically generated?
>>
>> In any case, can you just send a POST request if you know the values
>> required?
> 
> The problem is indeed that the form is dynamically generated.
> That's the .js file:


This seems to be generated by ChiliSpot (the most recent code is from 
http://coova.org/wiki/index.php/CoovaChilli), which also has a 
non-interactive or non-browser-based API/Interface. 

They even have custom application for mobile phones, and a 
Firefox extension for using that API.


> if (navigator.appVersion.indexOf("MSIE")!=-1)
> document.write("<script type='text/javascript'
> id='chillicontroller'></ script>");
> 
> if (!window.queryObj) {
>     window.queryObj = new Object();
>     window.location.search.replace(new RegExp("([^?=&]+)(=([^&]
> *))?","g"), function($0,$1,$2,$3) { queryObj[$1] = $3; });
>     if (queryObj['uamip'] == null && queryObj['uamport'] == null)
> {queryObj['uamip']='10.192.0.1';queryObj['uamport']='3990';}
> }
> 
> if (queryObj['uamip'] != null && queryObj['uamport'] != null) {
>     var script = document.getElementById('chillicontroller');
>     if (script == null) {
>   // 	document.write('manutenzione');
> script = document.createElement('script');
> script.id = 'chillicontroller';
> script.type = 'text/javascript';
>     script.src = 'http://'+queryObj['uamip']+':3990/www/
> chillijs.chi';
> 
>     var head = document.getElementsByTagName("head")[0];
>     if (head == null) head = document.body;
> head.appendChild(script);
>    }
>    script=document.getElementById('chillicontroller');
>    if(script==null)document.write('manutenzione');
>     script.src = 'http://'+queryObj['uamip']+':3990/www/chillijs.chi';
> 
> } else {
> //document.write('manutenzione');
>     var noLocation = document.getElementById("noLocation");
>     if (noLocation != null && noLocation.style) {
>        noLocation.style.display = 'inline';
>     }
> }

-- 
?????? ( http://softver.org.mk/damjan/ )

Well when _I_ was in school, I had to run Netscape on HP/UX, displayed on my 
local X Server running on a Windows 3.1 box. Displayed over a 2400 baud 
modem. Uphill. Both ways. In the rain. With NOBODY to hold my hands. Because 
the life of the geek is a lonely life.
- aclarke on /.



From walterbyrd at iname.com  Tue May 12 17:32:43 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Tue, 12 May 2009 14:32:43 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.59.1242161636.8015.python-list@python.org>
Message-ID: <d5e489b5-74ec-4388-9c6b-d7bbe7d60bbb@r31g2000prh.googlegroups.com>

On May 12, 2:53?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> walterbyrd wrote:
> > I have about 150 unix formated text files that I would like to convert
> > to dos formated.
>
> > I am guessing that I loop though each file in the directory, read each
> > line and conver the last character, then save to a file with the same
> > name in another directory.
>
> > I am not really sure what I convert the last charactor to.
>
> The quickest and OS-agnostic way would be:
>
> ? ? ?text = open(path, "U").read()
> ? ? ?text = text.replace("\n", "\r\n")
> ? ? ?open(path, "wb").write(text)
>
> That way it doesn't matter if the text file is already dos formatted.


Thanks, I am not familiar with the "U" here is how I did it:

------------
import os

for file in os.listdir('.'):
	infile = open(file,'r')
	outfile = open( 'new_' + file, 'w')
	for line in infile:
		line = line.rstrip() + '\r\n'
		outfile.write(line)
	infile.close()
	outfile.close()
------------

More code, probably slower, but it worked.


From python-bounces at py.cz  Tue May 12 17:51:00 2009
From: python-bounces at py.cz (python-bounces at py.cz)
Date: Tue, 12 May 2009 23:51:00 +0200
Subject: =?iso-8859-2?q?V=E1=B9_p=F8=EDsp=ECvek_do_konference_Python_=E8e?=
	=?iso-8859-2?q?k=E1_na_schv=E1len=ED_moder=E1torem?=
Message-ID: <mailman.30631.1242165060.31805.python@py.cz>

Va?e zpr?va pro konferenci 'Python' ve v?ci

    RE: SALE 79% 0FF on Pfizer!

Nebyla rozesl?na. Pro jej? distribuci je nutn? souhlas moder?tora.

D?vod pozdr?en? distribuce zpr?vy je:

    P??sp?vek od ne?lena do konference s p?isp?v?n?m omezen?m pouze na
?leny.

Va?e zpr?va bu? bude rozesl?na nebo dostanete zpr?vu o rozhodnut?
moder?tora.

Pokud si zpr?vu nep?ejete rozeslat, m??ete si stornovat na t?to
adrese:

    http://www.py.cz/mailman/confirm/python/fb63a3e8cb9c55286879670152dbda09df3b83bc



From davea at ieee.org  Tue May 12 17:56:17 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 12 May 2009 17:56:17 -0400
Subject: How to abort module evaluation?
In-Reply-To: <7c3885ec-41f3-469e-a5a6-7c7ebb5cc939@u10g2000vbd.googlegroups.com>
References: <7c3885ec-41f3-469e-a5a6-7c7ebb5cc939@u10g2000vbd.googlegroups.com>
Message-ID: <4A09F081.4050208@ieee.org>

mrstevegross wrote:
> I have a python script that is pretty simple: when executed, it
> imports a bunch of stuff and then runs some logic. When *imported*, it
> defines some variables and exits. Here's what it looks like:
>
> === foo.py ===
> if __name__ != '__main__':
>   x = 1
>   exit_somehow
>
> import bar
> do_some_stuff...
> === EOF ===
>
> There's a problem, though. On line 3, I wrote "exit_somehow".
> Actually, I have no idea how to do that part. Is there some way I can
> get python to abandon processing the rest of the script at that point?
> I know goto doesn't exist, so that's not an option... sys.exit() won't
> work, because that will abort the entire python interpreter, rather
> than just the evaluation of the module.
>
> Thanks,
> --Steve
>
>   
use "else" :

=== foo.py ===
if __name__ != '__main__':
  x = 1
  
else:
  import bar
  do_some_stuff...
=== EOF ===


This is rather unconventional usage, however.  In fact, Mike missed the 
!= in your comparison, perhaps because the other way is so common.  The 
usual idiom is:

import some stuff
define some globals, like  x=1
def some functions, classes etc.

if __name__ == "__main__":
    maybe import some extra stuff
    do_some_stuff

In this case, no else is needed,

Notice also that in your case, the x=1 doesn't take effect when you use 
it as a script, but only when it's being imported.  Usually, this is a 
mistake.



From google at mrabarnett.plus.com  Tue May 12 18:03:46 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 12 May 2009 23:03:46 +0100
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <d5e489b5-74ec-4388-9c6b-d7bbe7d60bbb@r31g2000prh.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>	<mailman.59.1242161636.8015.python-list@python.org>
	<d5e489b5-74ec-4388-9c6b-d7bbe7d60bbb@r31g2000prh.googlegroups.com>
Message-ID: <4A09F242.5040604@mrabarnett.plus.com>

walterbyrd wrote:
> On May 12, 2:53 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>> walterbyrd wrote:
>>> I have about 150 unix formated text files that I would like to convert
>>> to dos formated.
>>> I am guessing that I loop though each file in the directory, read each
>>> line and conver the last character, then save to a file with the same
>>> name in another directory.
>>> I am not really sure what I convert the last charactor to.
>> The quickest and OS-agnostic way would be:
>>
>>      text = open(path, "U").read()
>>      text = text.replace("\n", "\r\n")
>>      open(path, "wb").write(text)
>>
>> That way it doesn't matter if the text file is already dos formatted.
> 
> 
> Thanks, I am not familiar with the "U" here is how I did it:
> 
> ------------
> import os
> 
> for file in os.listdir('.'):
> 	infile = open(file,'r')
> 	outfile = open( 'new_' + file, 'w')
> 	for line in infile:
> 		line = line.rstrip() + '\r\n'
> 		outfile.write(line)
> 	infile.close()
> 	outfile.close()
> ------------
> 
> More code, probably slower, but it worked.

That will also strip any whitespace off the end of the lines.

FYI, if you run it on Windows then the resulting lines will end with
"\r\n\n" because the output file is opened in text mode, which will
write any "\n" as "\r\n".


From pavlovevidence at gmail.com  Tue May 12 18:38:18 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 12 May 2009 15:38:18 -0700 (PDT)
Subject: creating classes with mix-ins
References: <d6409bb3-f2ed-4964-942a-b0698060a7f0@e24g2000vbe.googlegroups.com>
	<fe808a4d-26e0-4003-be1a-2e768d7d81cc@r13g2000vbr.googlegroups.com> 
	<5c569b1b-5804-41e5-b384-149f67475af4@m24g2000vbp.googlegroups.com>
Message-ID: <443228fa-6366-4cc5-a843-014aa78fbd69@g20g2000vba.googlegroups.com>

On May 12, 4:45?am, samwyse <samw... at gmail.com> wrote:
> Unfortunately, 'boilerplate()' uses the handlers that I provide when
> MetaBlog is instantiated.

In that case, the handler functions should be attributes of the
instance, not of the class.  Do something like this:

class MetaBlog(object):
    def __init__(self):
        self.blog = blogHander()
        for name in self.blog.get_methods():
            setattr(self,name,self.boilerplate(name))

    def boilerplate(self,name):
        method = getattr(self.blog,name)
        def template(*args):
            self.do_verification_here()
            method(*args)
        return template


Carl Banks


From mensanator at aol.com  Tue May 12 19:56:24 2009
From: mensanator at aol.com (Mensanator)
Date: Tue, 12 May 2009 16:56:24 -0700 (PDT)
Subject: Nimrod programming language
References: <mailman.5356.1241924167.11746.python-list@python.org> 
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
	<4519cc9d-f765-4f55-81b2-58abfa20b988@p4g2000vba.googlegroups.com> 
	<49c224c0-1f58-4ff9-965c-a12f0aa26276@m24g2000vbp.googlegroups.com> 
	<ebc2a31b-02b8-4671-95bb-29cac0e412c3@s21g2000vbb.googlegroups.com> 
	<4bbb12e3-fe7f-40e9-aa24-1cc6c4175a8b@d19g2000prh.googlegroups.com>
Message-ID: <879eb69b-e506-4734-b565-ab20394dc9a6@z19g2000vbz.googlegroups.com>

On May 12, 12:54?pm, George Sakkis <george.sak... at gmail.com> wrote:
> On May 12, 12:49?pm, Mensanator <mensana... at aol.com> wrote:
>
>
>
>
>
> > On May 12, 8:27?am, rump... at web.de wrote:
>
> > > > > > The language and library are missing arbitrary precision integer
> > > > > > arithmetic, using GMP or something like that.
>
> > > > > True, but currently not a high priority for me.
>
> > > > Too bad. That makes Nimrod officially "worthless", i.e., of no
> > > > value to me.
>
> > > Well, you could write a wrapper for GMP (and contribute to the
> > > project ;-)).
>
> > But such a thing already exists in Python. And I spend my time
> > USING arbitrary precision numbers to do math research.
>
> > Just thought you'ld like to be aware that some people actually
> > make their language choices based on the availability (and
> > performance)
> > of arbitrary precision numbers.
>
> I'm sure developers of a new language have to deal with much more
> pressing issues before accommodating each and every self important
> niche.

If he gets enough feedback, won't he learn which niches are important
enought to accommodate? Such feedback was solicited, was it not? If
he
has more pressing issues to deal with, why is he trolling here?



From debl2NoSpam at verizon.net  Tue May 12 19:57:48 2009
From: debl2NoSpam at verizon.net (David Lees)
Date: Tue, 12 May 2009 23:57:48 GMT
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <mailman.22.1242108050.8015.python-list@python.org>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>
	<mailman.22.1242108050.8015.python-list@python.org>
Message-ID: <02oOl.710$wR5.489@nwrddc02.gnilink.net>

Mark Hammond wrote:
> Probably some import statement is finding a .pyd module built against 
> Python 2.5 instead of Python 2.6; it might be that PYTHONPATH points 
> somewhere wrong, or the registry for Python 2.6 is setup wrong, or 
> something else entirely...
> 
> Cheers,
> 
> Mark
> 
> On 12/05/2009 3:13 PM, David Lyon wrote:
>> Hi,
>>
>> hmmm... that's annoying..
>>
>> Whilst I don't have an exact answer I have a few hunches...
>>
>> Perphaps what has happened is that the windows installer between
>> the versions of pywin32 has installed newer versions of the same
>> dlls over the top of older ones.
>>
>> Or, possibly, the installer hasn't wanted to replace older dll's
>> because they already exist on the system.
>>
>> This would result in a mismatch.
>>
>> You may be lucky and find an install log. This might tell you which
>> files were actually installed. And you could play around with
>> moving them around.
>>
>> Good luck with your night vision task....
>>
>> David
>>
>>
>> On Tue, 12 May 2009 02:22:56 GMT, David Lees<debl2NoSpam at verizon.net>
>> wrote:
>>> I have no problem installing Python 2.6.2 for windows under XP SP3 and
>>> IDLE and the command line versions work fine.  When I run the pywin32
>>> installer downloaded from sourceforge (pywin32-212.win32-py2.6.exe) I
>>> get the following error message:
>>>
>>> Traceback (most recent call last):
>>>     File "<string>", line 565, in<module>
>>>     File "<string>", line 291, in install
>>> ImportError: Module use of python25.dll conflicts with this version of
>>> Python.
>>> *** run_installscript: internal error 0xFFFFFFFF ***
>>>
>>> I have tried uninstalling Python 2.6 and reinstalling, but still get the
>>> same message.  I do have Python 2.5.4 and its associated Pywin32 on the
>>> same machine, but I have a laptop with pywin32 installed for both python
>>> 2.5 and 2.6.
>>>
>>> TIA
>>>
>>> David Lees
> 
Mark and David,

Thanks for the help.  I just got it to install for Python 2.6.  All I 
did was change PYTHONPATH (as suggested by Mark) from 
C:\Python25\Lib\site-packages to C:\Python26\Lib\site-packages

David Lees


From tjreedy at udel.edu  Tue May 12 20:12:57 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 12 May 2009 20:12:57 -0400
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
Message-ID: <gud3a4$ej2$1@ger.gmane.org>

walterbyrd wrote:
> I have about 150 unix formated text files that I would like to convert
> to dos formated.

Are you sure you need to do that?  Most Windows programs (including 
Python) are happy reading text files with just \n for line endings.



From norseman at hughes.net  Tue May 12 20:15:12 2009
From: norseman at hughes.net (norseman)
Date: Tue, 12 May 2009 17:15:12 -0700
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
Message-ID: <4A0A1110.8050308@hughes.net>

walterbyrd wrote:
> I have about 150 unix formated text files that I would like to convert
> to dos formated.
> 
> I am guessing that I loop though each file in the directory, read each
> line and conver the last character, then save to a file with the same
> name in another directory.
> 
> I am not really sure what I convert the last charactor to.
===================
Subject line says UNIX to DOS

I hope that means you are using a UNIX machine.

addcr.scr
========
#!/bin/bash
#
cat $1 | sed s/$/$'\x0d'/ >$1.cr
#
#            end of file
========
I have utils on MSDOS that add the cr to get the   crlf sequence
I wrote it for use in the rare occasion. (my definition of rare. :)




rmcr.scr
========
#!/bin/sh
# rmcr.scr
# removes <cr> from text files
# Date: Feb. 2004
#   by: SLT
#     : file dressed up Dec. 2004
#
#   a literal <cr> follows first slash following the s.
#
i=$1
i1=${i%%.*}
echo $i1
cat $1 | sed s/^M// >$i1._cr
#
#            end of file
===========
The ^M will needs to be entered at 'type in' time.
In vi  it is done by  pressing CTRL-V  CTRL-M in sequence
DO NOT CUT n PASTE that line!!!
I have never been able to use the $'\x0d' in this file.
The MSDOS programs don not run on Linux, per se.  'Ya Think' :)


crlf    \r \n     x'0D' x'0A'    CTRL-M  CTRL-J
carriage return, line feed    keep the pair in the order shown.



to use in UNIX:

(be in a bash shell)
bash
for f in *.txt; do addcr.scr $f; done    # going to MSDOS

for f in *.txt; do rmcr.scr $f; done     # returning from MSDOS

if you run these on a binary - the binary is destroyed!!!


If you are in MSDOS, I have no help.
Well - see if you can find and download  FILT.EXE (ver 1.0)
   from the 1980 something era
FILT <Enter>  will present the helpfiles
It's what I use.  I set up batch (.BAT) files to expedite my desires.


Best of Luck


Steve


From david.lyon at preisshare.net  Tue May 12 20:19:05 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 12 May 2009 20:19:05 -0400
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <02oOl.710$wR5.489@nwrddc02.gnilink.net>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>
	<mailman.22.1242108050.8015.python-list@python.org>
	<02oOl.710$wR5.489@nwrddc02.gnilink.net>
Message-ID: <928d1dd50b040644e7cb791ee4cb7683@preisshare.net>

On Tue, 12 May 2009 23:57:48 GMT, David Lees <debl2NoSpam at verizon.net>
> Mark and David,
> 
> Thanks for the help.  I just got it to install for Python 2.6.  All I 
> did was change PYTHONPATH (as suggested by Mark) from 
> C:\Python25\Lib\site-packages to C:\Python26\Lib\site-packages

lol - so simple...

Thankfully, we got a quick answer by the package writing master himself.. 

but imho - package installation shouldn't be that tricky.. it should be
click and shoot... which is what i'm working on doing..

I have to say that I don't mind being corrected because I learnt 
something valuable too... 

David



From trevor.lango at gmail.com  Tue May 12 20:20:15 2009
From: trevor.lango at gmail.com (Trevor)
Date: Tue, 12 May 2009 17:20:15 -0700 (PDT)
Subject: py2exe + win32com + DAO
Message-ID: <30bcf41a-f6fe-4580-9735-888fbef419f1@v23g2000pro.googlegroups.com>

I have a Python code module that adds records to a MS Access
database.  The following line of code executes successfully when the
code module is run as a Python script:

daoEngine = win32com.client.Dispatch(r'DAO.DBEngine.36')

It also runs successfully when the Python script is compiled and run
as an executable using the Py2exe utility.  However, when the compiled
executable is called from VBA using the win32 CreateProcess function,
the preceding code produces this output:

!!python/name:pywintypes.com_error ''

What is causing this error?


From david.lyon at preisshare.net  Tue May 12 20:31:11 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 12 May 2009 20:31:11 -0400
Subject: py2exe + win32com + DAO
In-Reply-To: <30bcf41a-f6fe-4580-9735-888fbef419f1@v23g2000pro.googlegroups.com>
References: <30bcf41a-f6fe-4580-9735-888fbef419f1@v23g2000pro.googlegroups.com>
Message-ID: <4d2f31bd5f0fdd403256e055de676f4e@preisshare.net>


Maybe VB is opening the table in Exclusive mode... then when you
are opening it as a subprocess, it's already locked.

It's possible the win32com module is not giving you a very
descriptive error message.

Try running your process while vb is running at the same time
with the database open and if you get the same error then it 
might confirm my assertion.

Otherwise it is likely that it is something else.

On Tue, 12 May 2009 17:20:15 -0700 (PDT), Trevor <trevor.lango at gmail.com>
wrote:
> I have a Python code module that adds records to a MS Access
> database.  The following line of code executes successfully when the
> code module is run as a Python script:
> 
> daoEngine = win32com.client.Dispatch(r'DAO.DBEngine.36')
> 
> It also runs successfully when the Python script is compiled and run
> as an executable using the Py2exe utility.  However, when the compiled
> executable is called from VBA using the win32 CreateProcess function,
> the preceding code produces this output:
> 
> !!python/name:pywintypes.com_error ''
> 
> What is causing this error?


From drobinow at gmail.com  Tue May 12 21:28:13 2009
From: drobinow at gmail.com (David Robinow)
Date: Tue, 12 May 2009 21:28:13 -0400
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <02oOl.710$wR5.489@nwrddc02.gnilink.net>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>
	<mailman.22.1242108050.8015.python-list@python.org>
	<02oOl.710$wR5.489@nwrddc02.gnilink.net>
Message-ID: <4eb0089f0905121828x4e844f92ocab3fc2f716ff045@mail.gmail.com>

> Thanks for the help. ?I just got it to install for Python 2.6. ?All I did
> was change PYTHONPATH (as suggested by Mark) from
> C:\Python25\Lib\site-packages to C:\Python26\Lib\site-packages

Why do you have PYTHONPATH set at all?


From aahz at pythoncraft.com  Tue May 12 21:46:27 2009
From: aahz at pythoncraft.com (Aahz)
Date: 12 May 2009 18:46:27 -0700
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
	<guao50$1jv$1@panix3.panix.com>
	<Xns9C09513903E8FrtwfreenetREMOVEcouk@216.196.109.145>
Message-ID: <gud8pj$b3g$1@panix3.panix.com>

In article <Xns9C09513903E8FrtwfreenetREMOVEcouk at 216.196.109.145>,
Rob Williscroft  <rtw at freenet.co.uk> wrote:
>Aahz wrote in news:guao50$1jv$1 at panix3.panix.com in comp.lang.python:
>> In article <Xns9C08E179B66D8rtwfreenetREMOVEcouk at 216.196.109.145>,
>> Rob Williscroft  <rtw at freenet.co.uk> wrote:
>>>
>>>db.execute( '''
>>>         update "sessions" set "uid" = ?
>>>         where "uid" = ? 
>>>         and exists(
>>>                  select * from "users" where "uid" = ?
>>>           )
>>>    ''',
>>>    (v['uid'],s.SID, v['uid']) 
>>>  )
>> 
>> This will be more efficient if you do "select uid from users".
>
>What will be more efficient ?
>
>Do you mean the "select * ..." or do you want to take the exists 
>sub-query out and put it in a python if ? 

"select uid" will be more efficient than "select *", although I suppose
I could be wrong about that given how little I know about current query
optimizers.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From p_hemans at hotmail.com  Tue May 12 22:20:21 2009
From: p_hemans at hotmail.com (Paul Hemans)
Date: Tue, 12 May 2009 19:20:21 -0700 (PDT)
Subject: Help with a HTTP GET request
Message-ID: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>

I am trying to build a HTTP request that looks like:
http://localhost/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS%20sync=''%20schema=''%20class='replicateApplication.getChanges'%20/>
Works in a browser.

lxml.parse() gives me:
failed to load external entity

urllib2.urlopen() gives me:
Bad request

So I am trying httplib I have encoded the GET request with urllib.quote
()
and now I am attempting to use HTTPConnection
>>> conn = httplib.HTTPConnection("localhost")
>>> print x
%3CPROCESS%20sync%3D%27%27%20schema%3D%27%27%20class%3D
%27replicateApplication.getChanges%27%20/%3E
>>> this = conn.putrequest("GET",x)
>>> conn.endheaders()
>>> r = conn.getresponse()
>>> print r.read()
<html><head><title>Error</title></head><body>The parameter is
incorrect.
</body></html>

Any help would be appreciated.




From clp2 at rebertia.com  Tue May 12 22:30:35 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 12 May 2009 19:30:35 -0700
Subject: Help with a HTTP GET request
In-Reply-To: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
References: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
Message-ID: <50697b2c0905121930x5c469e64v5843156bc044f2de@mail.gmail.com>

On Tue, May 12, 2009 at 7:20 PM, Paul Hemans <p_hemans at hotmail.com> wrote:
> I am trying to build a HTTP request that looks like:
> http://localhost/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS%20sync=''%20schema=''%20class='replicateApplication.getChanges'%20/>
> Works in a browser.

I'm not 100% sure, but I don't think you can have < or > in a URL.
Your browser might be implicitly encoding them for you somehow.

Cheers,
Chris
-- 
http://blog.rebertia.com


From apt.shansen at gmail.com  Tue May 12 22:32:55 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Tue, 12 May 2009 19:32:55 -0700
Subject: Help with a HTTP GET request
In-Reply-To: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
References: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
Message-ID: <7a9c25c20905121932y634f8c42yc366501e2da81674@mail.gmail.com>

> I am trying to build a HTTP request that looks like:
> http://localhost/common/foxisapi.dll/tmsmail.x2.isapi
> ?<PROCESS%20sync=''%20schema=''%20class='replicateApplication.getChanges'%20/>
> Works in a browser.
>
> and now I am attempting to use HTTPConnection
> >>> conn = httplib.HTTPConnection("localhost")
> >>> print x
> %3CPROCESS%20sync%3D%27%27%20schema%3D%27%27%20class%3D
> %27replicateApplication.getChanges%27%20/%3E


At first glance, you left off most of the request :) Namely "
/common/foxisapi.dll/tmsmail.x2.isapi<http://localhost/common/foxisapi.dll/tmsmail.x2.isapi>
?"

And just included the encoded body.

--S
-------------- next part --------------
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From sjmachin at lexicon.net  Tue May 12 22:44:10 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 12 May 2009 19:44:10 -0700 (PDT)
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
	<guao50$1jv$1@panix3.panix.com> 
	<Xns9C09513903E8FrtwfreenetREMOVEcouk@216.196.109.145>
	<gud8pj$b3g$1@panix3.panix.com>
Message-ID: <b722bd36-c8f1-4cdf-8625-2550cee21511@i28g2000prd.googlegroups.com>

On May 13, 11:46?am, a... at pythoncraft.com (Aahz) wrote:
> In article <Xns9C09513903E8FrtwfreenetREMOVEc... at 216.196.109.145>,
> Rob Williscroft ?<r... at freenet.co.uk> wrote:
>
>
>
> >Aahz wrote innews:guao50$1jv$1 at panix3.panix.comin comp.lang.python:
> >> In article <Xns9C08E179B66D8rtwfreenetREMOVEc... at 216.196.109.145>,
> >> Rob Williscroft ?<r... at freenet.co.uk> wrote:
>
> >>>db.execute( '''
> >>> ? ? ? ? update "sessions" set "uid" = ?
> >>> ? ? ? ? where "uid" = ?
> >>> ? ? ? ? and exists(
> >>> ? ? ? ? ? ? ? ? ?select * from "users" where "uid" = ?
> >>> ? ? ? ? ? )
> >>> ? ?''',
> >>> ? ?(v['uid'],s.SID, v['uid'])
> >>> ?)
>
> >> This will be more efficient if you do "select uid from users".
>
> >What will be more efficient ?
>
> >Do you mean the "select * ..." or do you want to take the exists
> >sub-query out and put it in a python if ?
>
> "select uid" will be more efficient than "select *", although I suppose
> I could be wrong about that given how little I know about current query
> optimizers.

My take is that it won't matter what you select if the optimiser is
smart enough; something that requires minimal resources to produce is
indicated in case the optimiser is dumb:

 ... exists (select 1 from ... )



From usernet at ilthio.net  Tue May 12 23:12:40 2009
From: usernet at ilthio.net (Tim Harig)
Date: Wed, 13 May 2009 03:12:40 GMT
Subject: Help with a HTTP GET request
References: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
Message-ID: <IUqOl.22226$as4.7873@nlpi069.nbdc.sbc.com>

On 2009-05-13, Paul Hemans <p_hemans at hotmail.com> wrote:
> http://localhost/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS%20sync=''%20schema=''%20class='replicateApplication.getChanges'%20/>

Note the entire URL.
> So I am trying httplib I have encoded the GET request with urllib.quote

urllib would be much easier if you don't need low level control -- it will
automatically call httplib for you.

>>>> conn = httplib.HTTPConnection("localhost")
>>>> print x
> %3CPROCESS%20sync%3D%27%27%20schema%3D%27%27%20class%3D
> %27replicateApplication.getChanges%27%20/%3E
>>>> this = conn.putrequest("GET",x)

For one, x does not contain the entire request.
"/common/foxisapi.dll/tmsmail.x2.isapi?"  Should also be part of the
request; otherwise, the server doesn't know which script to call.  Your
script is requesting the QUERY_STRING instead of requesting the proper
script and handing the QUERY_STRING to it.  The report you are getting back
is likely your default top level script minus any rewrites or redirection.

If you just need the content of the request, then I suggest using urllib:

import urllib
url = "http://localhost/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS%20sync=''%20schema=''%20class='replicateApplication.getChanges'%20/"
content = urllib.urlopen(url).read()


From usernet at ilthio.net  Tue May 12 23:28:17 2009
From: usernet at ilthio.net (Tim Harig)
Date: Wed, 13 May 2009 03:28:17 GMT
Subject: Help with a HTTP GET request
References: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
	<IUqOl.22226$as4.7873@nlpi069.nbdc.sbc.com>
Message-ID: <l7rOl.22227$as4.7912@nlpi069.nbdc.sbc.com>

On 2009-05-13, Tim Harig <usernet at ilthio.net> wrote:
> import urllib
> url = "http://localhost/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS%20sync=''%20schema=''%20class='replicateApplication.getChanges'%20/"
> content = urllib.urlopen(url).read()

forgot to urlencode:

host = "http://localhost"
request = r"""/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS sync='' schema='' class='replicateApplication.getChanges' /"""
url = host + urllib.quote(request)
content = urllib.urlopen(url).read()


From sajmikins at gmail.com  Tue May 12 23:29:50 2009
From: sajmikins at gmail.com (Simon Forman)
Date: Tue, 12 May 2009 20:29:50 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
Message-ID: <fba2439b-a473-47e9-892e-cbb445a7a12c@z7g2000vbh.googlegroups.com>

On May 12, 4:39?pm, walterbyrd <walterb... at iname.com> wrote:
> I have about 150 unix formated text files that I would like to convert
> to dos formated.
>
> I am guessing that I loop though each file in the directory, read each
> line and conver the last character, then save to a file with the same
> name in another directory.
>
> I am not really sure what I convert the last charactor to.

Python source includes tool for this: lfcr.py

http://svn.python.org/view/python/trunk/Tools/scripts/lfcr.py?view=markup

Depending on how python was installed on your system you might already
have this script on your system.  (FYI there's also a crlf.py script
in the same directory too.)

HTH
~Simon


From martin at v.loewis.de  Tue May 12 23:32:16 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Wed, 13 May 2009 05:32:16 +0200
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <mailman.65.1242174135.8015.python-list@python.org>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>	<mailman.22.1242108050.8015.python-list@python.org>	<02oOl.710$wR5.489@nwrddc02.gnilink.net>
	<mailman.65.1242174135.8015.python-list@python.org>
Message-ID: <4a0a3f40$0$24009$9b622d9e@news.freenet.de>

> lol - so simple...
> 
> Thankfully, we got a quick answer by the package writing master himself.. 
> 
> but imho - package installation shouldn't be that tricky.. it should be
> click and shoot... which is what i'm working on doing..
> 
> I have to say that I don't mind being corrected because I learnt 
> something valuable too... 

I think this was a case of obscure misconfiguration of the system.
It is always possible to configure a system in such a way that even
the most resilient installation procedure will break.

Regards,
Martin


From usernet at ilthio.net  Tue May 12 23:38:22 2009
From: usernet at ilthio.net (Tim Harig)
Date: Wed, 13 May 2009 03:38:22 GMT
Subject: Help with a HTTP GET request
References: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
	<IUqOl.22226$as4.7873@nlpi069.nbdc.sbc.com>
	<l7rOl.22227$as4.7912@nlpi069.nbdc.sbc.com>
Message-ID: <OgrOl.22228$as4.5941@nlpi069.nbdc.sbc.com>

On 2009-05-13, Tim Harig <usernet at ilthio.net> wrote:
> host = "http://localhost"
> request = r"""/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS sync='' schema='' class='replicateApplication.getChanges' /"""
> url = host + urllib.quote(request)
> content = urllib.urlopen(url).read()

Which accidentally encodes the '?' separator.  Third times a charm:
host = "http://localhost"
script = "/common/foxisapi.dll/tmsmail.x2.isapi"
getData = r"""<PROCESS sync='' schema='' class='replicateApplication.getChanges' /"""
url = host + script + '?' + urllib.quote(getData)
content = urllib.urlopen(url).read()


From walterbyrd at iname.com  Tue May 12 23:42:26 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Tue, 12 May 2009 20:42:26 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.63.1242173586.8015.python-list@python.org>
Message-ID: <2cdfbdbf-8b26-486d-9abc-3422bddbe569@d2g2000pra.googlegroups.com>

On May 12, 6:12?pm, Terry Reedy <tjre... at udel.edu> wrote:

> Are you sure you need to do that? ?Most Windows programs (including
> Python) are happy reading text files with just \n for line endings.

These files will be looked at by some non-technical people. I am sure
these people will just click on the icons, and the file will come up
in notepad.

But, you are correct, I know that wordpad, and notepad++, and many
other apps will read the UNIX formated files just fine. IMO: notepad
is total junk, but it's still the default text editor on windows.


From walterbyrd at iname.com  Tue May 12 23:47:34 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Tue, 12 May 2009 20:47:34 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.64.1242173699.8015.python-list@python.org>
Message-ID: <cb3e2b24-d52f-46b0-9d5d-72564ae44833@a5g2000pre.googlegroups.com>

On May 12, 6:15?pm, norseman <norse... at hughes.net> wrote:

> Subject line says UNIX to DOS
>
> I hope that means you are using a UNIX machine.
>

I should have mentioned, I am working in an environment that is very
restrictive about what I can put on my XP desktop. I can not put
python, or even notepad++, on my desktop. But, I do have cygwin.

As you probably know, cygwin formats to UNIX.


From walterbyrd at iname.com  Tue May 12 23:56:55 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Tue, 12 May 2009 20:56:55 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.64.1242173699.8015.python-list@python.org>
Message-ID: <386bf8eb-0398-4345-9a02-68809d53a55b@d38g2000prn.googlegroups.com>

Thanks for shell script code. That code may be just as efficient, or
even more efficient, than python. But, to me, python is far more
readable.

------------
i=$1
i1=${i%%.*}
echo $i1
cat $1 | sed s/^M// >$i1._cr
-----------=


------------
import os

for file in os.listdir('.'):
        infile = open(file,'r')
        outfile = open( 'new_' + file, 'w')
        for line in infile:
                line = line.rstrip() + '\r\n'
                outfile.write(line)
        infile.close()
        outfile.close()
------------



From chinthakawk at gmail.com  Wed May 13 00:10:53 2009
From: chinthakawk at gmail.com (godshorse)
Date: Tue, 12 May 2009 21:10:53 -0700 (PDT)
Subject: Representing a Tree in Python
Message-ID: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>

Hello,

I want to find out the shortest path tree from a root to several nodes
in a graph data structure. I found a Dijkstra code from internet that
finds shortest path between only two nodes. How can i extend it to a
tree?. And what is the best way to represent a tree in Python?.

Thank you,


From paul.hemans at gmail.com  Wed May 13 00:15:20 2009
From: paul.hemans at gmail.com (Carbon-based)
Date: Tue, 12 May 2009 21:15:20 -0700 (PDT)
Subject: Help with a HTTP GET request
References: <9766636e-7a4b-4054-ae39-d5fb629fe567@j18g2000prm.googlegroups.com>
	<IUqOl.22226$as4.7873@nlpi069.nbdc.sbc.com>
	<l7rOl.22227$as4.7912@nlpi069.nbdc.sbc.com> 
	<OgrOl.22228$as4.5941@nlpi069.nbdc.sbc.com>
Message-ID: <a9521cec-34a8-481a-ab77-95dd952f4322@b6g2000pre.googlegroups.com>

Great, thank you very much.

On May 13, 1:38?pm, Tim Harig <user... at ilthio.net> wrote:
> On 2009-05-13, Tim Harig <user... at ilthio.net> wrote:
>
> > host = "http://localhost"
> > request = r"""/common/foxisapi.dll/tmsmail.x2.isapi?<PROCESS sync='' schema='' class='replicateApplication.getChanges' /"""
> > url = host + urllib.quote(request)
> > content = urllib.urlopen(url).read()
>
> Which accidentally encodes the '?' separator. ?Third times a charm:
> host = "http://localhost"
> script = "/common/foxisapi.dll/tmsmail.x2.isapi"
> getData = r"""<PROCESS sync='' schema='' class='replicateApplication.getChanges' /"""
> url = host + script + '?' + urllib.quote(getData)
> content = urllib.urlopen(url).read()



From warhammer1805 at gmail.com  Wed May 13 00:18:15 2009
From: warhammer1805 at gmail.com (warhammer1805 at gmail.com)
Date: Tue, 12 May 2009 21:18:15 -0700 (PDT)
Subject: New to python, can i ask for a little help?
Message-ID: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>

I loaded python 3.1
I can use the gui and i see the following:

Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>>

It would seem that this is working correctly and there is no path
problem.
I am running windows vista.

When i put in a test string i see this:

Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> print "hello world!"
SyntaxError: invalid syntax (<pyshell#0>, line 1)
>>>

Can anyone tell me what is wrong? I didnt expect that error....

Andrew


From david.lyon at preisshare.net  Wed May 13 00:18:47 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Wed, 13 May 2009 00:18:47 -0400
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <4a0a3f40$0$24009$9b622d9e@news.freenet.de>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>	<mailman.22.1242108050.8015.python-list@python.org>	<02oOl.710$wR5.489@nwrddc02.gnilink.net>
	<mailman.65.1242174135.8015.python-list@python.org>
	<4a0a3f40$0$24009$9b622d9e@news.freenet.de>
Message-ID: <64fc05ead382d1a8490deb9a07bd5f01@preisshare.net>

On Wed, 13 May 2009 05:32:16 +0200, "Martin v. L?wis" <martin at v.loewis.de>
wrote:
 
> I think this was a case of obscure misconfiguration of the system.
> It is always possible to configure a system in such a way that even
> the most resilient installation procedure will break.

Technically, you are right..

but imho.. windows installers are overkill and shouldn't be used
for this sort of thing. That is, installing libraries. And not
the fault of the package authors either...

if we could clean up the python universe and ensure all packages
are in either .egg or distutils packages then i think it would
be a nicer place...

Take care

David 



From greg at cosc.canterbury.ac.nz  Wed May 13 00:20:25 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Wed, 13 May 2009 16:20:25 +1200
Subject: What's the use of the else in try/except/else?
In-Reply-To: <gu9fl8$nmh$1@reader1.panix.com>
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net>
	<gu9fl8$nmh$1@reader1.panix.com>
Message-ID: <76v01gF1evk90U1@mid.individual.net>

kj wrote:

> Wow.  As rationales for syntax constructs go, this has got to be
> the most subtle one I've ever seen...

It's to avoid masking bugs. Suppose you accidentally
wrote

   try:
     v = mumble.field
     sys.warming('field was actually there?')
   except AttributeError:
     pass

Then you could easily fail to notice that
you had written 'warming' instead of 'warning'.

-- 
Greg


From sam at tregar.com  Wed May 13 00:25:24 2009
From: sam at tregar.com (Sam Tregar)
Date: Wed, 13 May 2009 00:25:24 -0400
Subject: New to python, can i ask for a little help?
In-Reply-To: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
References: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
Message-ID: <fe3354e50905122125y34c8ee0fv762a009c1e0e36a4@mail.gmail.com>

On Wed, May 13, 2009 at 12:18 AM, warhammer1805 at gmail.com <
warhammer1805 at gmail.com> wrote:

> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.
> >>> print "hello world!"
> SyntaxError: invalid syntax (<pyshell#0>, line 1)
> >>>
>
> Can anyone tell me what is wrong? I didnt expect that error....
>

Try:

  print("hello world!")

I believe Python 3 requires parenthesis for print.  Someone else can explain
why perhaps.

-sam
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From clp2 at rebertia.com  Wed May 13 00:27:05 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 12 May 2009 21:27:05 -0700
Subject: New to python, can i ask for a little help?
In-Reply-To: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
References: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
Message-ID: <50697b2c0905122127g53590a8fp6b073dbeedeefea7@mail.gmail.com>

On Tue, May 12, 2009 at 9:18 PM, warhammer1805 at gmail.com
<warhammer1805 at gmail.com> wrote:
> I loaded python 3.1
> I can use the gui and i see the following:
>
> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.
>>>>
>
> It would seem that this is working correctly and there is no path
> problem.
> I am running windows vista.
>
> When i put in a test string i see this:
>
> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.
>>>> print "hello world!"
> SyntaxError: invalid syntax (<pyshell#0>, line 1)
>>>>
>
> Can anyone tell me what is wrong? I didnt expect that error....

The print-statement was removed in Python 3.0. Now it's just a
function. You'll have to use:

print("hello world!")

instead.

Please also read the 3.0 transition docs:
http://docs.python.org/3.0/whatsnew/3.0.html
Note that Python 3.0 differs significantly from Python 2.x

Cheers,
Chris
-- 
http://blog.rebertia.com


From mensanator at aol.com  Wed May 13 00:31:01 2009
From: mensanator at aol.com (Mensanator)
Date: Tue, 12 May 2009 21:31:01 -0700 (PDT)
Subject: New to python, can i ask for a little help?
References: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
Message-ID: <9e50740c-ac6a-4646-b9c0-fdeeb0c3f6c2@m24g2000vbp.googlegroups.com>

On May 12, 11:18?pm, "warhammer1... at gmail.com"
<warhammer1... at gmail.com> wrote:
> I loaded python 3.1
> I can use the gui and i see the following:
>
> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.
>
>
>
> It would seem that this is working correctly and there is no path
> problem.
> I am running windows vista.
>
> When i put in a test string i see this:
>
> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.>>> print "hello world!"
>
> SyntaxError: invalid syntax (<pyshell#0>, line 1)
>
>
>
> Can anyone tell me what is wrong?

You're using Python 3.0.1. Print is now a function.
I think you would do print("Hello World"). Look it
up in the documentation.

> I didnt expect that error....

And it would have worked in Python 2.x.

>
> Andrew



From debatem1 at gmail.com  Wed May 13 00:54:13 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 12 May 2009 21:54:13 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
Message-ID: <22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com>

On May 13, 12:10?am, godshorse <chinthak... at gmail.com> wrote:
> Hello,
>
> I want to find out the shortest path tree from a root to several nodes
> in a graph data structure. I found a Dijkstra code from internet that
> finds shortest path between only two nodes. How can i extend it to a
> tree?. And what is the best way to represent a tree in Python?.
>
> Thank you,

Well, I'm biased, but I like <URL: http://graphine.org>.
As an example, to build a five node tree:

>>> from graph.base import Graph
>>> g = Graph()
>>> for i in range(5):
...     g.add_node(i)
...
>>> g.add_edge(0, 1)
>>> g.add_edge(0, 2)
>>> g.add_edge(1, 3)
>>> g.add_edge(1, 4)

And to find the shortest path between, say, node 0 and node 4:

>>> start = g[0]
>>> end = g[4]
>>> distance, edges = g.get_shortest_paths(start)[end]
>>> distance
2
>>> edges
[Edge(name=(0,1)), Edge(name=(1,4))]

Let me know what you think if you decide to use it- I'm looking for
feedback.

Geremy Condra


From trevor.lango at gmail.com  Wed May 13 01:06:42 2009
From: trevor.lango at gmail.com (Trevor)
Date: Tue, 12 May 2009 22:06:42 -0700 (PDT)
Subject: py2exe + win32com + DAO
References: <30bcf41a-f6fe-4580-9735-888fbef419f1@v23g2000pro.googlegroups.com>
	<mailman.66.1242174861.8015.python-list@python.org>
Message-ID: <9035670f-9057-4f3d-bfbb-5d693d030f62@y6g2000prf.googlegroups.com>

I do not believe your assertion applies to the following line of code:

daoEngine = win32com.client.Dispatch(r'DAO.DBEngine.36')

The preceding code snippet instantiates a COM object and is
prerequisite to creating a reference to a specific database:

daoDB = daoEngine.OpenDatabase(dbname)

As the compiled Python module executes successfully when invoked from
a command-line but not when invoked using the win32 CreateProcess
function, I suspect that one or more of the arguments to CreateProcess
is preventing successful execution.  I will investigate this further
(possibly on a win32 forum); however, is it possible to obtain more
verbose error output from Python modules?  The error message in the
original post was generated from:

print sys.exc_info()[0]

On May 12, 5:31?pm, David Lyon <david.l... at preisshare.net> wrote:
> Maybe VB is opening the table in Exclusive mode... then when you
> are opening it as a subprocess, it's already locked.
>
> It's possible the win32com module is not giving you a very
> descriptive error message.
>
> Try running your process while vb is running at the same time
> with the database open and if you get the same error then it
> might confirm my assertion.
>
> Otherwise it is likely that it is something else.
>
> On Tue, 12 May 2009 17:20:15 -0700 (PDT), Trevor <trevor.la... at gmail.com>
> wrote:
>
> > I have a Python code module that adds records to a MS Access
> > database. ?The following line of code executes successfully when the
> > code module is run as a Python script:
>
> > daoEngine = win32com.client.Dispatch(r'DAO.DBEngine.36')
>
> > It also runs successfully when the Python script is compiled and run
> > as an executable using the Py2exe utility. ?However, when the compiled
> > executable is called from VBA using the win32 CreateProcess function,
> > the preceding code produces this output:
>
> > !!python/name:pywintypes.com_error ''
>
> > What is causing this error?
>
>



From asmodai at in-nomine.org  Wed May 13 01:36:06 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Wed, 13 May 2009 07:36:06 +0200
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <cb3e2b24-d52f-46b0-9d5d-72564ae44833@a5g2000pre.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.64.1242173699.8015.python-list@python.org>
	<cb3e2b24-d52f-46b0-9d5d-72564ae44833@a5g2000pre.googlegroups.com>
Message-ID: <20090513053606.GB24353@nexus.in-nomine.org>

-On [20090513 05:53], walterbyrd (walterbyrd at iname.com) wrote:
>As you probably know, cygwin formats to UNIX.

That entirely depends on how you install it.

Anyway, I am sure the Cygwin repository has the tools dos2unix/unix2dos
available for installation.

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
In short may I, directly and indirectly, offer benefit and happiness to all
beings, may I secretly take upon myself the harm and suffering of all
beings...


From david.lyon at preisshare.net  Wed May 13 02:00:52 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Wed, 13 May 2009 02:00:52 -0400
Subject: py2exe + win32com + DAO
In-Reply-To: <9035670f-9057-4f3d-bfbb-5d693d030f62@y6g2000prf.googlegroups.com>
References: <30bcf41a-f6fe-4580-9735-888fbef419f1@v23g2000pro.googlegroups.com>
	<mailman.66.1242174861.8015.python-list@python.org>
	<9035670f-9057-4f3d-bfbb-5d693d030f62@y6g2000prf.googlegroups.com>
Message-ID: <4197fbb66026f3bb350f23cdf3983dc0@preisshare.net>

On Tue, 12 May 2009 22:06:42 -0700 (PDT), Trevor <trevor.lango at gmail.com>
wrote:
> I do not believe your assertion applies to the following line of code:
> 
> daoEngine = win32com.client.Dispatch(r'DAO.DBEngine.36')

It doesn't. I'm simply suggesting that it is possible you are opening
the database in Access or something in Administrator/dba mode. That
could be causing an exclusive lock on the database so that no sub
task can then open it. 

i have seen this on old versions of Access.

To provide excellent performance, microsoft used to load the whole
database into memory if it could. And just operate mostly from there.


> is it possible to obtain more
> verbose error output from Python modules?  The error message in the
> original post was generated from:
> 
> print sys.exc_info()[0]

possibly but i'm not sure how...

David



From scott at starlon.net  Wed May 13 02:10:25 2009
From: scott at starlon.net (Scott Flynn)
Date: Wed, 13 May 2009 01:10:25 -0500
Subject: Updates to enviironment variables and ctypes
Message-ID: <cb4d391b0905122310y35c1090l666aa037789e5bff@mail.gmail.com>

I was hoping I could update LD_LIBRARY_PATH at runtime and load a library
through ctypes from there, but I haven't been able to.

I've tried all of these.

os.environ['LD_LIBRARY_PATH'] = "./lib"
os.putenv('LD_LIBRARY_PATH', "./lib")
os.system("export LD_LIBRARY_PATH=./lib")
lib = CDLL("libevaluator.so")

Traceback (most recent call last):
  File "Evaluator.py", line 9, in <module>
    lib = CDLL("libevaluator.so")
  File "/usr/lib/python2.5/ctypes/__init__.py", line 348, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: libevaluator.so: cannot open shared object file: No such file or
directory

The only thing that works is to set the variable before starting Python. I'm
assuming that's just how it's going to be. Is this a bug or is it meant to
be?
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From chinthakawk at gmail.com  Wed May 13 02:31:07 2009
From: chinthakawk at gmail.com (godshorse)
Date: Tue, 12 May 2009 23:31:07 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com>
Message-ID: <43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>

On May 13, 11:54?am, CTO <debat... at gmail.com> wrote:
> On May 13, 12:10?am, godshorse <chinthak... at gmail.com> wrote:
>
> > Hello,
>
> > I want to find out the shortest path tree from a root to several nodes
> > in a graph data structure. I found a Dijkstra code from internet that
> > finds shortest path between only two nodes. How can i extend it to a
> > tree?. And what is the best way to represent a tree in Python?.
>
> > Thank you,
>
> Well, I'm biased, but I like <URL:http://graphine.org>.
> As an example, to build a five node tree:
>
> >>> from graph.base import Graph
> >>> g = Graph()
> >>> for i in range(5):
>
> ... ? ? g.add_node(i)
> ...
>
> >>> g.add_edge(0, 1)
> >>> g.add_edge(0, 2)
> >>> g.add_edge(1, 3)
> >>> g.add_edge(1, 4)
>
> And to find the shortest path between, say, node 0 and node 4:
>
> >>> start = g[0]
> >>> end = g[4]
> >>> distance, edges = g.get_shortest_paths(start)[end]
> >>> distance
> 2
> >>> edges
>
> [Edge(name=(0,1)), Edge(name=(1,4))]
>
> Let me know what you think if you decide to use it- I'm looking for
> feedback.
>
> Geremy Condra

Thanks very much for your reply Geremy. That site was interesting.

Actually the Graph building part is already completed now. I used a
dictionary for that and it works fine. for Dijkstra shortest path
problem your suggestion can be used.

But let me clear the my problem again. I have a graph. and I want to
find 'shortest path tree' from a root node to several nodes. as a
example if we have a graph of 5 nodes from 1 to 5, I need to build the
shortest path tree from node 1 to nodes 2,3,5. So my question is
instead of keeping separate lists for each destination node's shortest
path. How can I represent and store them in a tree structure using
python. Then I can easily find out what are the common nodes in the
path to each destination.

Thanks once again.


From guang.zeng37 at gmail.com  Wed May 13 02:45:09 2009
From: guang.zeng37 at gmail.com (guang.zeng37 at gmail.com)
Date: Tue, 12 May 2009 23:45:09 -0700 (PDT)
Subject: New to python, can i ask for a little help?
References: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
Message-ID: <69c884d3-6677-4b7c-9553-ceaf6ba5bd2f@s1g2000prd.googlegroups.com>

On May 13, 12:18?pm, "warhammer1... at gmail.com"
<warhammer1... at gmail.com> wrote:
> I loaded python 3.1
> I can use the gui and i see the following:
>
> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.
>
>
>
> It would seem that this is working correctly and there is no path
> problem.
> I am running windows vista.
>
> When i put in a test string i see this:
>
> Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.>>> print "hello world!"
>
> SyntaxError: invalid syntax (<pyshell#0>, line 1)
>
>
>
> Can anyone tell me what is wrong? I didnt expect that error....
>
> Andrew

print is a function. So you should do it this way: print("hello
world!")


From debatem1 at gmail.com  Wed May 13 02:56:50 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 12 May 2009 23:56:50 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com> 
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>
Message-ID: <31d0fc86-05d9-4f07-9076-1e8c13cff7a1@j12g2000vbl.googlegroups.com>

> But let me clear the my problem again. I have a graph. and I want to
> find 'shortest path tree' from a root node to several nodes. as a
> example if we have a graph of 5 nodes from 1 to 5, I need to build the
> shortest path tree from node 1 to nodes 2,3,5. So my question is
> instead of keeping separate lists for each destination node's shortest
> path. How can I represent and store them in a tree structure using
> python. Then I can easily find out what are the common nodes in the
> path to each destination.

A tree is just a connected acyclic rooted graph, so however you're
representing graphs should be a perfectly natural representation for
your shortest paths tree. In effect, you just treat the shortest
paths operation as an subgraph operation which only preserves the
edges that are part of a shortest path.

Geremy Condra



From venkatrajui at hotmail.com  Wed May 13 03:04:12 2009
From: venkatrajui at hotmail.com (Venkat Raju)
Date: Wed, 13 May 2009 12:34:12 +0530
Subject: Help needed to resolve ImportError
Message-ID: <BAY113-W36FB28C53C426C61D2A157A9610@phx.gbl>






Hi,
    We currently use VC6.0 and Python 2.2 for our project. 
 
As part of porting our project to VC2005 when i try to compile our application, it gives the following error
 
Traceback (most recent call last):
File "v:\Component\DS\scripts\messagebuilder\IL_Messagebuilder\test\test_IL_setget.py", line 20, in <module>
import IL_setget
File "\Component\DS\scripts\messagebuilder\IL_messagebuilder\IL_setget.py", line 22, in <module>
import IL_IEbuilder
File "\Component\DS\scripts\messagebuilder\IL_messagebuilder\IL_IEbuilder.py", line 11, in <module>
from MessageDictionary import *
File "\Component\LS\LSPythonFiles\MessageDictionary.py", line 3, in <module>
import ScriptInterpreter
ImportError: No module named ScriptInterpreter
 
 
 Basically, we are trying to import a VC compiled DLL into python script which generates another Python file. This issue doesnt occur in VC6.0 setup
 
I have tried setting path variables and options like copying scriptInterpreter.dll to python installation path and so on. HOwever it doesnt work.
 
Are there any compatibility issues between VC2005 and python 2.2? HOw can i resolve this.
 
Your help is highly appreciated.
 
Best Regards
Venkat
 
 
 
 


_________________________________________________________________
Drag n? drop?Get easy photo sharing with Windows Live? Photos.

http://www.microsoft.com/india/windows/windowslive/photos.aspx
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From henning.vonbargen at arcor.de  Wed May 13 03:18:54 2009
From: henning.vonbargen at arcor.de (henning.vonbargen at arcor.de)
Date: Wed, 13 May 2009 00:18:54 -0700 (PDT)
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
References: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>
Message-ID: <51d1dd3f-322d-47fa-9d44-75b92c6ef4e2@e20g2000vbc.googlegroups.com>

New info: The problem is not related to the specific program - it is
definitely a build problem, as the following test shows:
Python 2.6.2 (r262:71600, Apr 28 2009, 17:38:15)
[GCC 4.2.3] on hp-ux11
Type "help", "copyright", "credits" or "license" for more information.
>>> import threading
>>> threading._test()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.6/threading.py", line 952, in _test
    t.start()
  File "/usr/local/lib/python2.6/threading.py", line 471, in start
    _start_new_thread(self.__bootstrap, ())
thread.error: can't start new thread
>>>


The compiler I used was GCC 4.2.3


From prakash.stack at gmail.com  Wed May 13 03:40:25 2009
From: prakash.stack at gmail.com (prakash jp)
Date: Wed, 13 May 2009 13:10:25 +0530
Subject: python script as service
Message-ID: <805f59d50905130040t2b9dfaeaod2726b8ea41a4527@mail.gmail.com>

Hi all,

could any one tell how to run a python script as a scheduled service(say
every one minute). I tried out the windows registration

method but encountered an error . The error reads:

"The 'script name'  on local Computer started and then stopped. Some
services stop automatically if they have no work to do, for example, the
Performance Logs and Alerts service"

Regards
Prakash
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From jaime.frio at gmail.com  Wed May 13 04:19:13 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Wed, 13 May 2009 10:19:13 +0200
Subject: Representing a Tree in Python
In-Reply-To: <43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com>
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>
Message-ID: <97a8f1a70905130119r4f7d63b1g5183bb0a27c02d16@mail.gmail.com>

Dijkstra's algorithm computes shortest paths between a node and _ALL_
other nodes in the graph. It is usually stopped once computing the
shortest path to the target node is done, but that's simply for
efficiency, not a limitation of the algorithm. So you should be able
to tweak the code you are using so that it provides you with all you
are looking for. I'd be surprised if graphine (which, by the way,
looks great, CTO) or any other graph package didn't implement it, so
switching to that may be the most efficient thing to do.

On the other hand, if you want to post your code and links to the
Dijkstra code you are using it may be possible to help you with the
tweaking...

Jaime

On Wed, May 13, 2009 at 8:31 AM, godshorse <chinthakawk at gmail.com> wrote:
> On May 13, 11:54?am, CTO <debat... at gmail.com> wrote:
>> On May 13, 12:10?am, godshorse <chinthak... at gmail.com> wrote:
>>
>> > Hello,
>>
>> > I want to find out the shortest path tree from a root to several nodes
>> > in a graph data structure. I found a Dijkstra code from internet that
>> > finds shortest path between only two nodes. How can i extend it to a
>> > tree?. And what is the best way to represent a tree in Python?.
>>
>> > Thank you,
>>
>> Well, I'm biased, but I like <URL:http://graphine.org>.
>> As an example, to build a five node tree:
>>
>> >>> from graph.base import Graph
>> >>> g = Graph()
>> >>> for i in range(5):
>>
>> ... ? ? g.add_node(i)
>> ...
>>
>> >>> g.add_edge(0, 1)
>> >>> g.add_edge(0, 2)
>> >>> g.add_edge(1, 3)
>> >>> g.add_edge(1, 4)
>>
>> And to find the shortest path between, say, node 0 and node 4:
>>
>> >>> start = g[0]
>> >>> end = g[4]
>> >>> distance, edges = g.get_shortest_paths(start)[end]
>> >>> distance
>> 2
>> >>> edges
>>
>> [Edge(name=(0,1)), Edge(name=(1,4))]
>>
>> Let me know what you think if you decide to use it- I'm looking for
>> feedback.
>>
>> Geremy Condra
>
> Thanks very much for your reply Geremy. That site was interesting.
>
> Actually the Graph building part is already completed now. I used a
> dictionary for that and it works fine. for Dijkstra shortest path
> problem your suggestion can be used.
>
> But let me clear the my problem again. I have a graph. and I want to
> find 'shortest path tree' from a root node to several nodes. as a
> example if we have a graph of 5 nodes from 1 to 5, I need to build the
> shortest path tree from node 1 to nodes 2,3,5. So my question is
> instead of keeping separate lists for each destination node's shortest
> path. How can I represent and store them in a tree structure using
> python. Then I can easily find out what are the common nodes in the
> path to each destination.
>
> Thanks once again.
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From martin at librador.com  Wed May 13 04:44:11 2009
From: martin at librador.com (Martin Vilcans)
Date: Wed, 13 May 2009 10:44:11 +0200
Subject: Nimrod programming language
In-Reply-To: <043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>
References: <159308160@web.de>
	<mailman.29.1242119171.8015.python-list@python.org> 
	<043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>
Message-ID: <f782707a0905130144g130b5e4cw74e42b5dff54793a@mail.gmail.com>

On Tue, May 12, 2009 at 3:10 PM,  <rumpf_a at web.de> wrote:
>> You can certainly have a string type that uses byte arrays in UTF-8
>> encoding internally, but your string functions should be aware of that
>> and treat it as a unicode string. The len function and index operators
>> should count characters, not bytes. Add a byte array data type for
>> byte arrays instead.
>>
> It's not easy. I think Python3's byte arrays have an "upper" method
> (and a string literal syntax b"abc") which is quite alarming to me
> that they chose the wrong default.

I suppose that is to make it possible to use the 'bytes' data type for
text strings if you really want to (and for backwards-compatibility).
Default text strings should use Unicode (as in Python 3), and that
should be supported by the language.

> Eventually the "rope" data structure (that the compiler uses heavily)
> will become a proper part of the library: By "rope" I mean an
> immutable string implemented as a tree, so concatenation is O(1). For
> immutable strings there is no ``[]=`` operation, so using UTF-8 and
> converting it to a 32bit char works better.

Consider a string class that keeps track of its own encoding and can
change it on the fly as needed.

-- 
martin at librador.com
http://www.librador.com


From ldo at geek-central.gen.new_zealand  Wed May 13 04:44:27 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 13 May 2009 20:44:27 +1200
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz>
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
	<pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <gue19b$4no$1@lust.ihug.co.nz>

In message <pan.2009.05.12.09.35.36 at REMOVE.THIS.cybersource.com.au>, Steven 
D'Aprano wrote:

> On Tue, 12 May 2009 09:20:36 +0000, Steven D'Aprano wrote:
>
>> It seems pretty straightforward to me.
> 
> Except of course such a pattern won't work ...

I rest my case.



From chinthakawk at gmail.com  Wed May 13 04:49:23 2009
From: chinthakawk at gmail.com (godshorse)
Date: Wed, 13 May 2009 01:49:23 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com> 
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com> 
	<mailman.78.1242202760.8015.python-list@python.org>
Message-ID: <74fba814-bd05-4d4d-bf44-63750b2ef428@f1g2000prb.googlegroups.com>

On May 13, 3:19?pm, Jaime Fernandez del Rio <jaime.f... at gmail.com>
wrote:
> Dijkstra's algorithm computes shortest paths between a node and _ALL_
> other nodes in the graph. It is usually stopped once computing the
> shortest path to the target node is done, but that's simply for
> efficiency, not a limitation of the algorithm. So you should be able
> to tweak the code you are using so that it provides you with all you
> are looking for. I'd be surprised if graphine (which, by the way,
> looks great, CTO) or any other graph package didn't implement it, so
> switching to that may be the most efficient thing to do.
>
> On the other hand, if you want to post your code and links to the
> Dijkstra code you are using it may be possible to help you with the
> tweaking...
>
> Jaime
>
>
>
> On Wed, May 13, 2009 at 8:31 AM, godshorse <chinthak... at gmail.com> wrote:
> > On May 13, 11:54?am, CTO <debat... at gmail.com> wrote:
> >> On May 13, 12:10?am, godshorse <chinthak... at gmail.com> wrote:
>
> >> > Hello,
>
> >> > I want to find out the shortest path tree from a root to several nodes
> >> > in a graph data structure. I found a Dijkstra code from internet that
> >> > finds shortest path between only two nodes. How can i extend it to a
> >> > tree?. And what is the best way to represent a tree in Python?.
>
> >> > Thank you,
>
> >> Well, I'm biased, but I like <URL:http://graphine.org>.
> >> As an example, to build a five node tree:
>
> >> >>> from graph.base import Graph
> >> >>> g = Graph()
> >> >>> for i in range(5):
>
> >> ... ? ? g.add_node(i)
> >> ...
>
> >> >>> g.add_edge(0, 1)
> >> >>> g.add_edge(0, 2)
> >> >>> g.add_edge(1, 3)
> >> >>> g.add_edge(1, 4)
>
> >> And to find the shortest path between, say, node 0 and node 4:
>
> >> >>> start = g[0]
> >> >>> end = g[4]
> >> >>> distance, edges = g.get_shortest_paths(start)[end]
> >> >>> distance
> >> 2
> >> >>> edges
>
> >> [Edge(name=(0,1)), Edge(name=(1,4))]
>
> >> Let me know what you think if you decide to use it- I'm looking for
> >> feedback.
>
> >> Geremy Condra
>
> > Thanks very much for your reply Geremy. That site was interesting.
>
> > Actually the Graph building part is already completed now. I used a
> > dictionary for that and it works fine. for Dijkstra shortest path
> > problem your suggestion can be used.
>
> > But let me clear the my problem again. I have a graph. and I want to
> > find 'shortest path tree' from a root node to several nodes. as a
> > example if we have a graph of 5 nodes from 1 to 5, I need to build the
> > shortest path tree from node 1 to nodes 2,3,5. So my question is
> > instead of keeping separate lists for each destination node's shortest
> > path. How can I represent and store them in a tree structure using
> > python. Then I can easily find out what are the common nodes in the
> > path to each destination.
>
> > Thanks once again.
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> --
> (\__/)
> ( O.o)
> ( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
> planes de dominaci?n mundial.

Hello Jaime,

Thanks for the reply.

This is the link to the code that I am using. http://code.activestate.com/recipes/119466/
What I do in my code is just looping through the destination nodes and
find the shortest path to each node.

Thanks


From bvrkchowdary at yahoo.co.in  Wed May 13 04:55:51 2009
From: bvrkchowdary at yahoo.co.in (VenkataRamaKrishna Boddu)
Date: Wed, 13 May 2009 14:25:51 +0530 (IST)
Subject: Proposal to Add New Method to List Object: Mutable Sequence Types
Message-ID: <926641.66419.qm@web8408.mail.in.yahoo.com>

Hi All,

This is my first mail to python-list.

I just want to propose the idea of introducing a new method for the List Object in similar lines of Dictionary Object has_key method.

See my below code, It always produces the ValueError, if I want to check whether an item is present or not, then they is no method in the List Object (do a "dir(list)").

So., Is it not good, to have a method in List Object, may be something like has_item to check whether a item is present or not?

#============== CODE ==============================
partsOfMyName = ['Python', 'Perl', 'PHP', 'MySQL'];
## strSearchKey = 'Perl';
strSearchKey = 'Prl';

indexofKey = partsOfMyName.index(strSearchKey);
print 'Index of search key: %s:  %d'%(strSearchKey, indexofKey);

Thanks
Venkata Rama Krishna Boddu


      Explore and discover exciting holidays and getaways with Yahoo! India Travel http://in.travel.yahoo.com/
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From CinnamonDonkey at googlemail.com  Wed May 13 05:20:46 2009
From: CinnamonDonkey at googlemail.com (CinnamonDonkey)
Date: Wed, 13 May 2009 02:20:46 -0700 (PDT)
Subject: (Winows) Finding out which process has locked a file.
Message-ID: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>

Hi all,

Does anyone know how I can programatically find out which process
(resolved to human friendly string, i.e. executable) has a lock on a
file.

I have a script running which occassionally fails because it is trying
to delete a file in use by another process. When this happens I want
it to log which process has the lock.

Since it tends to happen when I am never near the computer to catch
it! :(

Cheers,
Shaun


From drobinow at gmail.com  Wed May 13 05:21:49 2009
From: drobinow at gmail.com (David Robinow)
Date: Wed, 13 May 2009 05:21:49 -0400
Subject: Convert UNIX formated text files to DOS formated?
In-Reply-To: <cb3e2b24-d52f-46b0-9d5d-72564ae44833@a5g2000pre.googlegroups.com>
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.64.1242173699.8015.python-list@python.org>
	<cb3e2b24-d52f-46b0-9d5d-72564ae44833@a5g2000pre.googlegroups.com>
Message-ID: <4eb0089f0905130221x12e6306dvbfe449e5b67e4d12@mail.gmail.com>

On Tue, May 12, 2009 at 11:47 PM, walterbyrd <walterbyrd at iname.com> wrote:
> On May 12, 6:15?pm, norseman <norse... at hughes.net> wrote:
>
>> Subject line says UNIX to DOS
>>
>> I hope that means you are using a UNIX machine.
>>
>
> I should have mentioned, I am working in an environment that is very
> restrictive about what I can put on my XP desktop. I can not put
> python, or even notepad++, on my desktop. But, I do have cygwin.
>
> As you probably know, cygwin formats to UNIX.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

cygwin has u2d and d2u


From david.lyon at preisshare.net  Wed May 13 05:56:48 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Wed, 13 May 2009 05:56:48 -0400
Subject: python script as service
In-Reply-To: <805f59d50905130040t2b9dfaeaod2726b8ea41a4527@mail.gmail.com>
References: <805f59d50905130040t2b9dfaeaod2726b8ea41a4527@mail.gmail.com>
Message-ID: <8740f3eaf1383dfff79817c8bd38dd8d@preisshare.net>


On XP, go to Start Menu/All Programs/Accessories/System Tools/Scheduled
Tasks

Add your program in with the scheduled task wizard...

On Wed, 13 May 2009 13:10:25 +0530, prakash jp <prakash.stack at gmail.com>
wrote:
> Hi all,
> 
> could any one tell how to run a python script as a scheduled service(say
> every one minute). I tried out the windows registration
> 
> method but encountered an error . The error reads:
> 
> "The 'script name'  on local Computer started and then stopped. Some
> services stop automatically if they have no work to do, for example, the
> Performance Logs and Alerts service"
> 
> Regards
> Prakash


From daved170 at gmail.com  Wed May 13 06:00:41 2009
From: daved170 at gmail.com (daved170)
Date: Wed, 13 May 2009 03:00:41 -0700 (PDT)
Subject: PythonCard - My app stuck when button clicked
Message-ID: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>

Hi there,
I'm newbie in pythonCard.
I have an application with 2 buttons : START , STOP
Start execute a while(1) loop that execute my calculations.
Stop suppose to raise a flag that will end that loop.

Whenever I pish the START button my GUI is stuck. the calculation
executes but I can't push the STOP button.

I added thread that START start a thread that execute my calculations.
I also added a Global variable that will hold the indication if the
loop should continue.
The problem now is that the thread ignore that variable and loop
forever.

Is there a simple way to make sure that the GUI won't stuck (without
threads)?
And if there isn't such way I would appriciet it very much if anyone
could post an example of how to make my thread read that variable
Thanks
Dave


From shailja.gulati at tcs.com  Wed May 13 06:58:54 2009
From: shailja.gulati at tcs.com (Shailja Gulati)
Date: Wed, 13 May 2009 16:28:54 +0530
Subject: about Python doc reader
Message-ID: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>

Hi ,

I am currently working on "Information retrieval from semi structured 
Documents" in which there is a need to read data from Resumes.

Could anyone tell me is there any python API to read Word doc?


Thanks and regards,
Shailja

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From theller at python.net  Wed May 13 07:51:33 2009
From: theller at python.net (Thomas Heller)
Date: Wed, 13 May 2009 13:51:33 +0200
Subject: json vs. simplejson
Message-ID: <76vqi5F1eq4rjU1@mid.individual.net>

Python 2.6 contains the json module, which I thought was the renamed (and improved?)
simplejson module that also works on older Python versions.

However, it seems the json is a lot slower than simplejson.
This little test, run on Python 2.6.2 and WinXP shows a dramatic difference:

  C:\>py26 -m timeit -s "from json import dumps, loads" "loads(dumps(range(32)))"
  1000 loops, best of 3: 618 usec per loop

  C:\>py26 -m timeit -s "from simplejson import dumps, loads" "loads(dumps(range(32)))"
  10000 loops, best of 3: 31 usec per loop

Does anyone have an explanation for that?

Thanks,
Thomas


From theller at python.net  Wed May 13 07:54:49 2009
From: theller at python.net (Thomas Heller)
Date: Wed, 13 May 2009 13:54:49 +0200
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <mailman.70.1242188517.8015.python-list@python.org>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>	<mailman.22.1242108050.8015.python-list@python.org>	<02oOl.710$wR5.489@nwrddc02.gnilink.net>	<mailman.65.1242174135.8015.python-list@python.org>	<4a0a3f40$0$24009$9b622d9e@news.freenet.de>
	<mailman.70.1242188517.8015.python-list@python.org>
Message-ID: <76vqo9F1eq4rjU2@mid.individual.net>

David Lyon schrieb:
> On Wed, 13 May 2009 05:32:16 +0200, "Martin v. L?wis" <martin at v.loewis.de>
> wrote:
>  
>> I think this was a case of obscure misconfiguration of the system.
>> It is always possible to configure a system in such a way that even
>> the most resilient installation procedure will break.
> 
> Technically, you are right..
> 
> but imho.. windows installers are overkill and shouldn't be used
> for this sort of thing. That is, installing libraries. And not
> the fault of the package authors either...

Well, if you don't like the windows installer than you can always
install from the sources.  Please go ahead and try it out.

Thomas


From deets at nospam.web.de  Wed May 13 08:02:53 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 13 May 2009 14:02:53 +0200
Subject: json vs. simplejson
References: <76vqi5F1eq4rjU1@mid.individual.net>
Message-ID: <76vr3uF1ejv91U1@mid.uni-berlin.de>

Thomas Heller wrote:

> Python 2.6 contains the json module, which I thought was the renamed (and
> improved?) simplejson module that also works on older Python versions.
> 
> However, it seems the json is a lot slower than simplejson.
> This little test, run on Python 2.6.2 and WinXP shows a dramatic
> difference:
> 
>   C:\>py26 -m timeit -s "from json import dumps, loads"
>   "loads(dumps(range(32)))" 1000 loops, best of 3: 618 usec per loop
> 
>   C:\>py26 -m timeit -s "from simplejson import dumps, loads"
>   "loads(dumps(range(32)))" 10000 loops, best of 3: 31 usec per loop
> 
> Does anyone have an explanation for that?

Dunno about json, but simplejson comes with an (optional) C-based
speedup-module.

Maybe this isn't part of the standard distribution? 

Diez


From bearophileHUGS at lycos.com  Wed May 13 08:19:58 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Wed, 13 May 2009 05:19:58 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com> 
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>
Message-ID: <98ea5010-2eab-43de-b5a2-d4f79a06f25e@z19g2000vbz.googlegroups.com>

godshorse, you may use the "shortestPaths" method of this graph class
of mine:
http://sourceforge.net/projects/pynetwork/

(It uses the same Dijkstra code by Eppstein).
(Once you have all distances from a node to the other ones, it's not
too much difficult to find the tree you talk about).

Also see the Minimum spanning tree:
http://en.wikipedia.org/wiki/Minimum_spanning_tree

Bye,
bearophile


From theller at python.net  Wed May 13 08:21:17 2009
From: theller at python.net (Thomas Heller)
Date: Wed, 13 May 2009 14:21:17 +0200
Subject: json vs. simplejson
In-Reply-To: <76vr3uF1ejv91U1@mid.uni-berlin.de>
References: <76vqi5F1eq4rjU1@mid.individual.net>
	<76vr3uF1ejv91U1@mid.uni-berlin.de>
Message-ID: <76vs9tF1f6c58U1@mid.individual.net>

Diez B. Roggisch schrieb:
> Thomas Heller wrote:
> 
>> Python 2.6 contains the json module, which I thought was the renamed (and
>> improved?) simplejson module that also works on older Python versions.
>> 
>> However, it seems the json is a lot slower than simplejson.
>> This little test, run on Python 2.6.2 and WinXP shows a dramatic
>> difference:
>> 
>>   C:\>py26 -m timeit -s "from json import dumps, loads"
>>   "loads(dumps(range(32)))" 1000 loops, best of 3: 618 usec per loop
>> 
>>   C:\>py26 -m timeit -s "from simplejson import dumps, loads"
>>   "loads(dumps(range(32)))" 10000 loops, best of 3: 31 usec per loop
>> 
>> Does anyone have an explanation for that?
> 
> Dunno about json, but simplejson comes with an (optional) C-based
> speedup-module.
> 
> Maybe this isn't part of the standard distribution? 


json has it's own _json speedup module.  And funny, on Linux, json
WITH _json is still somewhat slower (~10%) than simplejson WITHOUT
the _speedups module.

Thomas


From kushal.kumaran at gmail.com  Wed May 13 08:37:45 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Wed, 13 May 2009 18:07:45 +0530
Subject: about Python doc reader
In-Reply-To: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>
Message-ID: <1e364c4e0905130537u472cf2c8v24ab3eb725e8199d@mail.gmail.com>

On Wed, May 13, 2009 at 4:28 PM, Shailja Gulati <shailja.gulati at tcs.com> wrote:
>
> Hi ,
>
> I am currently working on "Information retrieval from semi structured
> Documents" in which there is a need to read data from Resumes.
>
> Could anyone tell me is there any python API to read Word doc?
>

If you're using Windows, you can use COM APIs to read Word documents.
Or you can use OpenOffice.org using uno.  You can find examples of
either by googling.

-- 
kushal


From davea at dejaviewphoto.com  Wed May 13 08:56:56 2009
From: davea at dejaviewphoto.com (Dave Angel)
Date: Wed, 13 May 2009 08:56:56 -0400
Subject: Updates to enviironment variables and ctypes
In-Reply-To: <cb4d391b0905122310y35c1090l666aa037789e5bff@mail.gmail.com>
References: <cb4d391b0905122310y35c1090l666aa037789e5bff@mail.gmail.com>
Message-ID: <4A0AC398.8080405@dejaviewphoto.com>

Scott Flynn wrote:
> I was hoping I could update LD_LIBRARY_PATH at runtime and load a library
> through ctypes from there, but I haven't been able to.
>
> I've tried all of these.
>
> os.environ['LD_LIBRARY_PATH'] = "./lib"
> os.putenv('LD_LIBRARY_PATH', "./lib")
> os.system("export LD_LIBRARY_PATH=./lib")
> lib = CDLL("libevaluator.so")
>
> Traceback (most recent call last):
>   File "Evaluator.py", line 9, in <module>
>     lib = CDLL("libevaluator.so")
>   File "/usr/lib/python2.5/ctypes/__init__.py", line 348, in __init__
>     self._handle = _dlopen(self._name, mode)
> OSError: libevaluator.so: cannot open shared object file: No such file or
> directory
>
> The only thing that works is to set the variable before starting Python. I'm
> assuming that's just how it's going to be. Is this a bug or is it meant to
> be?
>
>   
(You should mention that you're using Unix, and probably what version of 
Python you're using.  It might make a difference.)

Doesn't ctypes.LoadLibrary() accept a pathname as argument?  That's what 
the Python 2.6 docs say.  I haven't experimented, but it'd be worth a 
try.  In this case, I'd make it an absolute path, just to convince it 
not to look through the directories in the LD_LIBRARY_PATH.



From svarovsky.tomas at gmail.com  Wed May 13 08:57:47 2009
From: svarovsky.tomas at gmail.com (Tomas Svarovsky)
Date: Wed, 13 May 2009 05:57:47 -0700 (PDT)
Subject: urllib2 slow for multiple requests
Message-ID: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>

Hello everybody, really new to python, so bear with me. I am trying to
do some very basic scraping tool. Bascally it just grabs a page xy
times and tells me how long it took. When I do this once, it is
blazingly fast, but when I increase the number of repetitions, it is
slowing down considerably (1 is like 3 ms, 100 takes 6 seconds). I
have done implementations in couple more languages (php, ruby) and
none of them seems to suffer from a similar problem and it seems, that
it behaves linearly. Maybe it is a known issue in urllib2, or I am
simply using it badly. I am using python 2.4.3, machine has CentOS,
below is the sc. Thanks in advance

import urllib2
from datetime import datetime

def application():
    start = datetime.now()
    req = urllib2.Request("http://127.0.0.1/gdc/about", None,
{'Accept': 'application/json'})
    for number in range(100):
      response = urllib2.urlopen(req)
    end = datetime.now()
    output = end - start
    print output

application()


From mail at timgolden.me.uk  Wed May 13 09:01:59 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 13 May 2009 14:01:59 +0100
Subject: about Python doc reader
In-Reply-To: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>
Message-ID: <4A0AC4C7.1060000@timgolden.me.uk>

Shailja Gulati wrote:
> Hi ,
> 
> I am currently working on "Information retrieval from semi structured 
> Documents" in which there is a need to read data from Resumes.
> 
> Could anyone tell me is there any python API to read Word doc?

If you haven't already, get hold of the pywin32 extensions:

  http://pywin32.sf.net

<code>
import win32com.client

doc = win32com.client.GetObject ("c:/temp/temp.doc")
text = doc.Range ().Text

</code>

Note that this will give you a unicode object with \r line-delimiters.
You could read para by para if that were more useful:

<code>
import win32com.client

doc = win32com.client.GetObject ("c:/temp/temp.doc")
lines = [p.Range () for p in doc.Paragraphs]

</code>

TJG


From david.lyon at preisshare.net  Wed May 13 09:05:38 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Wed, 13 May 2009 09:05:38 -0400
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <76vqo9F1eq4rjU2@mid.individual.net>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>	<mailman.22.1242108050.8015.python-list@python.org>	<02oOl.710$wR5.489@nwrddc02.gnilink.net>	<mailman.65.1242174135.8015.python-list@python.org>	<4a0a3f40$0$24009$9b622d9e@news.freenet.de>
	<mailman.70.1242188517.8015.python-list@python.org>
	<76vqo9F1eq4rjU2@mid.individual.net>
Message-ID: <9211c720176a0ad4e161b3c0be52d80c@preisshare.net>

On Wed, 13 May 2009 13:54:49 +0200, Thomas Heller <theller at python.net>

> 
> Well, if you don't like the windows installer than you can always
> install from the sources.  Please go ahead and try it out.

Thanks for the offer... 

but aren't python .eggs supposed to remove the need for doing that ?

Regards

David


From emile at fenx.com  Wed May 13 10:05:30 2009
From: emile at fenx.com (Emile van Sebille)
Date: Wed, 13 May 2009 07:05:30 -0700
Subject: (Winows) Finding out which process has locked a file.
In-Reply-To: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
Message-ID: <guek3e$co3$1@ger.gmane.org>

On 5/13/2009 2:20 AM CinnamonDonkey said...
> Hi all,
> 
> Does anyone know how I can programatically find out which process
> (resolved to human friendly string, i.e. executable) has a lock on a
> file.
> 
> I have a script running which occassionally fails because it is trying
> to delete a file in use by another process. When this happens I want
> it to log which process has the lock.
> 

You might take a look at http://ccollomb.free.fr/unlocker/ -- I've not 
used the command line options although they are available...

Emile




From mail at timgolden.me.uk  Wed May 13 10:21:09 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 13 May 2009 15:21:09 +0100
Subject: (Winows) Finding out which process has locked a file.
In-Reply-To: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
Message-ID: <4A0AD755.3060306@timgolden.me.uk>

CinnamonDonkey wrote:
> Hi all,
> 
> Does anyone know how I can programatically find out which process
> (resolved to human friendly string, i.e. executable) has a lock on a
> file.
> 
> I have a script running which occassionally fails because it is trying
> to delete a file in use by another process. When this happens I want
> it to log which process has the lock.
> 
> Since it tends to happen when I am never near the computer to catch
> it! :(


Usual place to look for these things is sysinternals (now part of
Microsoft). In particular, the handle util:

  http://technet.microsoft.com/en-us/sysinternals/bb896655.aspx

To get the same programatically you have to delve quite deep
into the NT low-level API. Not tried it myself.

TJG


From aahz at pythoncraft.com  Wed May 13 10:25:05 2009
From: aahz at pythoncraft.com (Aahz)
Date: 13 May 2009 07:25:05 -0700
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
References: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>
	<51d1dd3f-322d-47fa-9d44-75b92c6ef4e2@e20g2000vbc.googlegroups.com>
Message-ID: <guel81$roq$1@panix3.panix.com>

In article <51d1dd3f-322d-47fa-9d44-75b92c6ef4e2 at e20g2000vbc.googlegroups.com>,
 <henning.vonbargen at arcor.de> wrote:
>
>New info: The problem is not related to the specific program - it is
>definitely a build problem, as the following test shows:
>Python 2.6.2 (r262:71600, Apr 28 2009, 17:38:15)
>[GCC 4.2.3] on hp-ux11
>Type "help", "copyright", "credits" or "license" for more information.
>>>> import threading
>>>> threading._test()
>Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File "/usr/local/lib/python2.6/threading.py", line 952, in _test
>    t.start()
>  File "/usr/local/lib/python2.6/threading.py", line 471, in start
>    _start_new_thread(self.__bootstrap, ())
>thread.error: can't start new thread
>>>>
>
>The compiler I used was GCC 4.2.3

You probably want to start by figuring out which threading library is
being used -- Python normally wants Posix threads, but IIRC, that's not
the default on HP-UX, and you may need to fix the build process to use
Posix.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From walterbyrd at iname.com  Wed May 13 10:32:06 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Wed, 13 May 2009 07:32:06 -0700 (PDT)
Subject: Convert UNIX formated text files to DOS formated?
References: <338105f6-7a33-4844-a54b-2d17eed2be3f@x1g2000prh.googlegroups.com>
	<mailman.64.1242173699.8015.python-list@python.org>
	<cb3e2b24-d52f-46b0-9d5d-72564ae44833@a5g2000pre.googlegroups.com>
	<mailman.80.1242206512.8015.python-list@python.org>
Message-ID: <55d9aae7-c274-4181-8036-35c965908fc1@x31g2000prc.googlegroups.com>

On May 13, 3:21?am, David Robinow <drobi... at gmail.com> wrote:
> cygwin has u2d and d2u- Hide quoted text -

Thank you, I did not know about those utilities, until now.




From agaskins_ng at kelleramerica.com  Wed May 13 10:40:18 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Wed, 13 May 2009 10:40:18 -0400
Subject: PythonCard - My app stuck when button clicked
References: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>
Message-ID: <qZAOl.57208$vj3.30528@newsfe01.iad>

I second this.

I am very interested in PyCard having just discovered it in your message 
here. I know I'll run in to this same problem in my application that will 
run test routines that must have a mechanism to abort.

Sorry for the lack of any help here...

-Adam

"daved170" <daved170 at gmail.com> wrote in message 
news:e7a3e095-974f-4239-8812-44f304f5fb37 at n21g2000vba.googlegroups.com...
> Hi there,
> I'm newbie in pythonCard.
> I have an application with 2 buttons : START , STOP
> Start execute a while(1) loop that execute my calculations.
> Stop suppose to raise a flag that will end that loop. 




From cgoldberg at gmail.com  Wed May 13 10:55:02 2009
From: cgoldberg at gmail.com (cgoldberg)
Date: Wed, 13 May 2009 07:55:02 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
Message-ID: <9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com>

> Bascally it just grabs a page xy
> times and tells me how long it took.

you aren't doing a read(), so technically you are just connecting to
the web server and sending the request but never reading the content
back from the socket.  So your timing wouldn't be accurate.

try this instead:
response = urllib2.urlopen(req).read()

But that is not the problem you are describing...


> when I increase the number of repetitions, it is
> slowing down considerably (1 is like 3 ms, 100 takes 6 seconds).
> Maybe it is a known issue in urllib2

I ran your code and can not reproduce that behavior.  No matter how
many repetitions, I still get a similar response time per transaction.

any more details or code samples you can provide?

-Corey Goldberg


From MadHatter7 at myself.com  Wed May 13 11:00:01 2009
From: MadHatter7 at myself.com (MadHatter7 at myself.com)
Date: Wed, 13 May 2009 08:00:01 -0700 (PDT)
Subject: spam
References: <c59adc81-4af9-4a67-9428-7feecf32b836@j9g2000prh.googlegroups.com>
Message-ID: <6174e712-c008-410f-a730-2a59cd1506e8@b6g2000pre.googlegroups.com>

spam


From showell30 at yahoo.com  Wed May 13 11:26:38 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Wed, 13 May 2009 08:26:38 -0700 (PDT)
Subject: Call Web Service using proxy and http authentication
References: <3ebae673-2579-4589-b57a-2330c5fe9f3c@j12g2000vbl.googlegroups.com>
	<f8e3d564-b19f-4767-b4cb-b7dfcb86ecca@j18g2000prm.googlegroups.com> 
	<ebab040f-f2e4-4387-8da6-d568b865785a@o27g2000vbd.googlegroups.com>
Message-ID: <f17ad6fe-866d-4dbc-bca7-2ed8a8d39bee@v35g2000pro.googlegroups.com>

On May 12, 12:51?pm, wdveloper <tot... at gmail.com> wrote:
> On May 12, 8:38?pm, Steve Howell <showel... at yahoo.com> wrote:
>
>
>
> > On May 12, 8:59?am, wdveloper <tot... at gmail.com> wrote:
>
> > > Hi everyone,
>
> > > I am trying to call a webservice which requires an http
> > > authentication.
> > > To reach the ws, I must pass from a proxy http. So in the whole I need
> > > go through two authentications before getting the ws working. I am
> > > using SOAPpy and I'm getting quite crazy.
> > > I am able to arrange this problem with simple http calls using urllib2
> > > but for the ws i dont see any way out.
>
> > > Does anyone knows how I can manage this stuff? Is there any better
> > > solution or example code?
>
> > Your high level description of the problem is good, but I think you'll
> > get more help if you provide a little more detail.
>
> > For something like this you may want to try to do more at the HTTP
> > level, where you have a little more control over the authentication,
> > and then find a way to hook into SOAPpy just to build and parse the
> > payloads.
>
> > How good is your understanding of HTTP? ?Do you know the basics of how
> > headers work? ?You might want to brush up a little on HTTP just to
> > help understand what's going on; it will almost certainly be valuable
> > for future projects as well.
>
> > To understand how the proxy works in particular, if you can use the
> > proxy to access a normal html-serving website, you can use the "Live
> > HTTP Headers" tool under Firefox to see what's going on.
>
> > But before all that, I would maybe just post a little more detail on
> > the problem. ?Maybe show code you've written so far, and any error
> > messages/tracebacks, to better indicate where you are stuck.
>
> Thank you very much Steve,
>
> I do have a good understanding of http and its headers rules, and of
> course I can work on that.
> On the other hand, I am new to python and SOAPpy toolkit and I dont
> have much of an experience working with ws in general.
>
> When it comes of working with simple call to WS, everything is
> successfull; problems start cause I dont know how to use the toolkit
> to compose the http request. I should code it in the way that it
> connects to my proper proxy and it gets authenticated in the server
> exposing the service.
>
> What I have is something like:
> from SOAPpy import WSDL
>
> wsdl = 'http://myws?wsdl'
> my_http_proxy = '10.x.x.x:8080'
> proxy = WSDL.Proxy(wsdl, http_proxy=my_http_proxy)
> res = proxy.myService( myparam='...' )
>
> What I get is that connection reaches timeout since the server doesnt
> see me coming from the right proxy.
> First problem, I can't see where I can put my proxy authentication
> username and password.
> Second, when I will be able to pass through the right proxy, I need to
> authenticate on the server via http through my credential.
>


Have you looked at the URLopener class?


From moradks at gmail.com  Wed May 13 11:53:20 2009
From: moradks at gmail.com (Morad)
Date: Wed, 13 May 2009 08:53:20 -0700 (PDT)
Subject: Can't run PyQt apps with MacPython
Message-ID: <25cdb69b-689c-4cfe-a378-3016b3d50e50@s21g2000vbb.googlegroups.com>

I recently got a new MacBook Pro with Leopard, and would like to
develop using Python and PyQt. I installed the latest Qt SDK, updated
MacPython to V 2.5.4 and then proceeded to install SIP and PyQt as
described in Mark Summerfield's book on PyQt Programming. Everything
went fine and none of the scripts complained. However when I want to
run a demo app, I get the error message "Fatal Python error:
Interpreter not initialized (version mismatch?) / Abort Trap". Anybody
can help?


From manu3d at gmail.com  Wed May 13 12:08:13 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Wed, 13 May 2009 09:08:13 -0700 (PDT)
Subject: DOM implementation
Message-ID: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>

Hi everybody,

I just spent the past hour or so trying to have a better understanding
of how the various DOM-supporting libraries (xml.dom, xml.dom.minidom)
work. I've used etree and lxml successfully before but I wanted to
understand how close I can get to the W3C DOM standards. Ok, I  think
more or less I got it all. A few questions emerged:

1) classes in xml.dom.minidom (i.e. Element) seem to be old style
classes. Is there a good reason they are kept that way or simply
nobody had the time/will to update the library to use new-style
classes?

2) for a lightweight implementation xml.dom.minidom comes with a lot
of methods that aren't part of the W3C standards. I'm referring to
toxml, toprettyxml, writxml and the _get_* family. Would it be better
if there was a package offering W3C-faithful classes only, on top of
which convenience and compatibility methods are added by another
package (or two!) through subclassing?

Manu


From bvidinli at gmail.com  Wed May 13 12:12:56 2009
From: bvidinli at gmail.com (bvidinli)
Date: Wed, 13 May 2009 19:12:56 +0300
Subject: php to python code converter
In-Reply-To: <1ca12653-4c28-48f1-bf17-def74a89ef15@h23g2000vbc.googlegroups.com>
References: <mailman.5292.1241795959.11746.python-list@python.org> 
	<1ca12653-4c28-48f1-bf17-def74a89ef15@h23g2000vbc.googlegroups.com>
Message-ID: <36e8a7020905130912o164b8cb5t6e129a5513bb054b@mail.gmail.com>

i designed php to python converter a few monthos ago, to translate
some of my ready made code snippets to python.
i was experienced with php and was  learning  python.

as stated on project home, it is only intended for translating small
code snippets or small functions to python.

whole applications, cannot be converted using that...

only an idea, a very beta/alpha package,

since there are huge amount of php applications, files, codes all
around web, this would be a good tool if developed and used
properly...


From wells at submute.net  Wed May 13 12:14:05 2009
From: wells at submute.net (Wells)
Date: Wed, 13 May 2009 09:14:05 -0700 (PDT)
Subject: n00b question: Possible to pass lists to a Template class?
Message-ID: <cc34bfbc-e6a8-47ed-af95-adf0d42cf9e2@t11g2000vbc.googlegroups.com>

Is it possible to pass a list to the Template.substitute method and
use that in the template, like so..

g = string.Template(gametemplate)
print g.substitute(recap = "none", winner = game["winner"], loser =
game["loser"])

Then in the template...

<b>winner.team

Where winner.team would be the value of game["winner"]["team"].

Thanks!


From wells at submute.net  Wed May 13 12:22:32 2009
From: wells at submute.net (Wells)
Date: Wed, 13 May 2009 09:22:32 -0700 (PDT)
Subject: n00b question: Possible to pass lists to a Template class?
References: <cc34bfbc-e6a8-47ed-af95-adf0d42cf9e2@t11g2000vbc.googlegroups.com>
Message-ID: <5cdc08d7-c9d9-415d-9ae8-5a67cd94dbc4@s28g2000vbp.googlegroups.com>

On May 13, 11:14?am, Wells <we... at submute.net> wrote:
> Is it possible to pass a list to the Template.substitute method and
> use that in the template, like so..
>
> g = string.Template(gametemplate)
> print g.substitute(recap = "none", winner = game["winner"], loser =
> game["loser"])
>
> Then in the template...
>
> <b>winner.team
>
> Where winner.team would be the value of game["winner"]["team"].
>
> Thanks!

Sorry, I meant dicts, not lists. Like I said, n00b question.


From davea at ieee.org  Wed May 13 12:23:15 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 13 May 2009 12:23:15 -0400
Subject: (Winows) Finding out which process has locked a file.
In-Reply-To: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
Message-ID: <4A0AF3F3.1000305@ieee.org>



CinnamonDonkey wrote:
> Hi all,
>
> Does anyone know how I can programatically find out which process
> (resolved to human friendly string, i.e. executable) has a lock on a
> file.
>
> I have a script running which occassionally fails because it is trying
> to delete a file in use by another process. When this happens I want
> it to log which process has the lock.
>
> Since it tends to happen when I am never near the computer to catch
> it! :(
>
> Cheers,
> Shaun
>
>
>   
This may depend on what version of Windows you're using, as the API's 
changed in Windows 2000, and again in XP SP2, and probably again in Vista.

I don't know an API for what you want, but filemon, from 
http://technet.microsoft.com/en-us/sysinternals/bb896642.aspx
can build a log of file activity, which you can examine later.


If you do find an API that works on XP and better, please let us know.  
Even if you only know a function name, I'd be willing to play with it 
some, to see what it might do.  I'd like to find out, and would share 
what I did figure out.




From paul at boddie.org.uk  Wed May 13 12:29:40 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Wed, 13 May 2009 09:29:40 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
Message-ID: <fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com>

On 13 Mai, 18:08, "Emanuele D'Arrigo" <man... at gmail.com> wrote:
>
> I just spent the past hour or so trying to have a better understanding
> of how the various DOM-supporting libraries (xml.dom, xml.dom.minidom)
> work. I've used etree and lxml successfully before but I wanted to
> understand how close I can get to the W3C DOM standards.

You might want to look at pxdom if you want a high level of compliance
with W3C DOM standards:

http://www.doxdesk.com/software/py/pxdom.html

> Ok, I ?think more or less I got it all. A few questions emerged:
>
> 1) classes in xml.dom.minidom (i.e. Element) seem to be old style
> classes. Is there a good reason they are kept that way or simply
> nobody had the time/will to update the library to use new-style
> classes?

I imagine that no-one bothered to update the code. The built-in
modules like minidom do get maintenance, but not much further
development. (PyXML, which seemed to accumulate code from 4Suite,
possibly contributed code to the standard library, but it doesn't seem
to be actively maintained or developed any more.)

> 2) for a lightweight implementation xml.dom.minidom comes with a lot
> of methods that aren't part of the W3C standards. I'm referring to
> toxml, toprettyxml, writxml and the _get_* family. Would it be better
> if there was a package offering W3C-faithful classes only, on top of
> which convenience and compatibility methods are added by another
> package (or two!) through subclassing?

Those methods probably don't add that much weight, considering the
weight that the W3C facilities already necessitate. I attempted to
make a somewhat W3C-compliant implementation with the libxml2dom
package (http://pypi.python.org/pypi/libxml2dom), although I felt that
providing PyXML-like conveniences (similar to those you describe) was
beneficial: some of the W3C APIs for parsing and serialisation are
baroque, and although I've tried to implement some of those, too, I
feel that it isn't a good use of my time.

Paul


From suruti94 at gmail.com  Wed May 13 12:40:13 2009
From: suruti94 at gmail.com (Mohan Parthasarathy)
Date: Wed, 13 May 2009 09:40:13 -0700
Subject: How to see the code definiton in the shell ?
Message-ID: <89dd3da60905130940l2f3560afx2a7751a354223afc@mail.gmail.com>

Hi,

I am new to Python. I tried searching this but could not find an answer. In
the interactive shell, I write a new function and I want to be able to see
all the code that I wrote at a later time. Just typing the function name
only shows

>>> allmethods
<function allmethods at 0x822b0>

How do I see the actual code ?

thanks
mohan
-------------- next part --------------
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From matiassurdi at gmail.com  Wed May 13 13:00:01 2009
From: matiassurdi at gmail.com (Matias Surdi)
Date: Wed, 13 May 2009 19:00:01 +0200
Subject: How to see the code definiton in the shell ?
In-Reply-To: <89dd3da60905130940l2f3560afx2a7751a354223afc@mail.gmail.com>
References: <89dd3da60905130940l2f3560afx2a7751a354223afc@mail.gmail.com>
Message-ID: <gueuag$jpq$1@ger.gmane.org>

Mohan Parthasarathy escribi?:
> Hi,
> 
> I am new to Python. I tried searching this but could not find an answer. 
> In the interactive shell, I write a new function and I want to be able 
> to see all the code that I wrote at a later time. Just typing the 
> function name only shows
> 
>  >>> allmethods
> <function allmethods at 0x822b0>
> 
> How do I see the actual code ?
> 
> thanks
> mohan
> 


I think that is not possible (at least, not with the default python 
console and without doing introspection).

Anyway, why you need to do that? Why not write down the script in a text 
file and run it?

If you need to "run a console" inside a function so that you can inspect 
variables, maybe you can use:

import pdb;pdb.set_trace()

And that will start a debug session when gets executed.


Hope that helps.




From jcd at sdf.lonestar.org  Wed May 13 13:26:18 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Wed, 13 May 2009 13:26:18 -0400
Subject: How to see the code definiton in the shell ?
In-Reply-To: <89dd3da60905130940l2f3560afx2a7751a354223afc@mail.gmail.com>
References: <89dd3da60905130940l2f3560afx2a7751a354223afc@mail.gmail.com>
Message-ID: <1242235578.4400.54.camel@aalcdl07>

On Wed, 2009-05-13 at 09:40 -0700, Mohan Parthasarathy wrote:
> Hi,
> 
> I am new to Python. I tried searching this but could not find an
> answer. In the interactive shell, I write a new function and I want to
> be able to see all the code that I wrote at a later time. Just typing
> the function name only shows 
> 
> >>> allmethods
> <function allmethods at 0x822b0>
> 
> How do I see the actual code ?
> 
> thanks
> mohan
> 

The function definition itself has been compiled down to bytecode.  You
can see the bytecode as follows:

>>> def one():
...     return 1
...
>>> print one.func_code.co_code  # not very readable
'd\x01\x00S'
>>> import dis # python disassembler
>>> dis.dis(one.func_code.co_code)
          0 LOAD_CONST          1 (1)
          3 RETURN_VALUE   

or just run dis.dis on the function itself

>>> def two():
...     import math
...     return (math.e ** (0+1J*math.pi)) + 3
... 
>>> two()
(2+1.2246063538223773e-16j)
>>> two.func_code.co_code
'd\x01\x00d\x00\x00k\x00\x00}\x00\x00|\x00\x00i\x01\x00d\x02\x00d\x03
\x00|\x00\x00i\x02\x00\x14\x17\x13d\x04\x00\x17S'
>>> dis.dis(two)
  2           0 LOAD_CONST               1 (-1)
              3 LOAD_CONST               0 (None)
              6 IMPORT_NAME              0 (math)
              9 STORE_FAST               0 (math)

  3          12 LOAD_FAST                0 (math)
             15 LOAD_ATTR                1 (e)
             18 LOAD_CONST               2 (0)
             21 LOAD_CONST               3 (1j)
             24 LOAD_FAST                0 (math)
             27 LOAD_ATTR                2 (pi)
             30 BINARY_MULTIPLY     
             31 BINARY_ADD          
             32 BINARY_POWER        
             33 LOAD_CONST               4 (3)
             36 BINARY_ADD          
             37 RETURN_VALUE        





From davea at ieee.org  Wed May 13 13:42:43 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 13 May 2009 13:42:43 -0400
Subject: PythonCard - My app stuck when button clicked
In-Reply-To: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>
References: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>
Message-ID: <4A0B0693.2030200@ieee.org>

daved170 wrote:
> Hi there,
> I'm newbie in pythonCard.
> I have an application with 2 buttons : START , STOP
> Start execute a while(1) loop that execute my calculations.
> Stop suppose to raise a flag that will end that loop.
>
> Whenever I pish the START button my GUI is stuck. the calculation
> executes but I can't push the STOP button.
>
> I added thread that START start a thread that execute my calculations.
> I also added a Global variable that will hold the indication if the
> loop should continue.
> The problem now is that the thread ignore that variable and loop
> forever.
>
> Is there a simple way to make sure that the GUI won't stuck (without
> threads)?
> And if there isn't such way I would appriciet it very much if anyone
> could post an example of how to make my thread read that variable
> Thanks
> Dave
>
>   
I don't know PythonCard, but most GUI's are similar enough that the 
concepts will work, even though the details differ.  I'll assume that 
PythonCard has a traditional event loop, from which all events are 
dispatched.

If your loop is fairly small, then you should keep it to one thread.  
Debugging it will usually be much easier.  The trick is to break the 
task into pieces (each piece might be once around what is now a loop), 
and invoke one piece each time the event loop empties.  I can't tell you 
how to do that without seeing your loop, but it's not usually very hard.

Now, there is some way of POSTing an event to the event loop.  That puts 
the event *after* all the events that are already there, but returns 
control immediately.  So create a custom event, and POST it from the 
START button's button-pressed event.  That will fire off one "loop" of 
the special task, in other words, make one function call to your new 
function.  Then at the end of the function, POST it again, unless the 
STOP button has been pressed in the meantime.

An optimization for this is to use coroutines, which are usually done 
with a generator.  It's much trickier to describe, but much easier to 
accomplish.  Roughly, you'd take your existing loop, and put a yield 
statement in it at appropriate place(s).  Then the custom event is 
simply a call to the .next() function of that generator.



Now, threading isn't that tough either, depending on how much data is 
being shared between the thread and the main program.  You say that 
sharing a global flag isn't working, but it should.  So how about if you 
show us some code, and somebody'll spot the trouble.  For example, is 
the thread defined in the same module as the App?  Global only shares 
between a single module.  Another reason globals might seem to fail is 
if you tried to do mutual imports between two or more modules.  (A 
imports B, which imports A).  Sometimes that fails in mysterious ways.


Make a simple (stripped) example of what you're trying, and we'll try to 
find the problem.  Without concrete code, we end up with ambiguities 
like the above usage of two different meanings for "the loop."



From Scott.Daniels at Acm.Org  Wed May 13 13:53:26 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 13 May 2009 10:53:26 -0700
Subject: What's the use of the else in try/except/else?
In-Reply-To: <76v01gF1evk90U1@mid.individual.net>
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net>
	<gu9fl8$nmh$1@reader1.panix.com>
	<76v01gF1evk90U1@mid.individual.net>
Message-ID: <hJadnVLfGu9EmpbXnZ2dnUVZ_uGdnZ2d@pdx.net>

greg wrote:
> kj wrote:
> 
>> Wow.  As rationales for syntax constructs go, this has got to be
>> the most subtle one I've ever seen...
> 
> It's to avoid masking bugs. Suppose you accidentally
> wrote
> 
>   try:
>     v = mumble.field
>     sys.warming('field was actually there?')
>   except AttributeError:
>     pass
> 
> Then you could easily fail to notice that
> you had written 'warming' instead of 'warning'.
> 
Well, if you look, you'll discover that warning is not in the
sys module at all, but in the logging module.
So the original example already demonstrated the problem.

--Scott David Daniels
Scott.Daniels at Acm.Org


From nad at acm.org  Wed May 13 13:53:30 2009
From: nad at acm.org (Ned Deily)
Date: Wed, 13 May 2009 10:53:30 -0700
Subject: json vs. simplejson
References: <76vqi5F1eq4rjU1@mid.individual.net>
	<76vr3uF1ejv91U1@mid.uni-berlin.de>
	<76vs9tF1f6c58U1@mid.individual.net>
Message-ID: <nad-B321E6.10533013052009@news.gmane.org>

In article <76vs9tF1f6c58U1 at mid.individual.net>,
 Thomas Heller <theller at python.net> wrote:
> Diez B. Roggisch schrieb:
> > Thomas Heller wrote:
> >> Python 2.6 contains the json module, which I thought was the renamed (and
> >> improved?) simplejson module that also works on older Python versions.
> >> 
> >> However, it seems the json is a lot slower than simplejson.
> >> This little test, run on Python 2.6.2 and WinXP shows a dramatic
> >> difference:
> >>   C:\>py26 -m timeit -s "from json import dumps, loads"
> >>   "loads(dumps(range(32)))" 1000 loops, best of 3: 618 usec per loop
> >> 
> >>   C:\>py26 -m timeit -s "from simplejson import dumps, loads"
> >>   "loads(dumps(range(32)))" 10000 loops, best of 3: 31 usec per loop> >> 
> >> Does anyone have an explanation for that?
> > 
> > Dunno about json, but simplejson comes with an (optional) C-based
> > speedup-module.
> > 
> > Maybe this isn't part of the standard distribution? 
> json has it's own _json speedup module.  And funny, on Linux, json
> WITH _json is still somewhat slower (~10%) than simplejson WITHOUT
> the _speedups module.

According to the svn history in 2.6, the json module was a copy of 
simplejson 1.9.  The current version of simplejson is 2.0.9 and, 
according to its CHANGES.txt, there have been a number of performance 
improvements in the various releases since 1.9.  Looks like the trunk 
(2.7) version of json has been updated to the latest simplejson.

-- 
 Ned Deily,
 nad at acm.org



From piet at cs.uu.nl  Wed May 13 14:03:04 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 13 May 2009 20:03:04 +0200
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
Message-ID: <m27i0kc23r.fsf@cs.uu.nl>

>>>>> godshorse <chinthakawk at gmail.com> (g) wrote:

>g> Hello,
>g> I want to find out the shortest path tree from a root to several nodes
>g> in a graph data structure. I found a Dijkstra code from internet that
>g> finds shortest path between only two nodes. How can i extend it to a
>g> tree?. And what is the best way to represent a tree in Python?.

http://networkx.lanl.gov/ has all kinds of Dijkstra's algorithms.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From adnanhameed750 at gmail.com  Wed May 13 14:54:54 2009
From: adnanhameed750 at gmail.com (adnan ji)
Date: Wed, 13 May 2009 11:54:54 -0700 (PDT)
Subject: get detail about latest computer
Message-ID: <38d0393e-795d-42bf-8d16-bded41d302bb@d2g2000pra.googlegroups.com>

its for you get about latest computer laptop free more visit www.glu007.blog.com


From theller at python.net  Wed May 13 14:58:10 2009
From: theller at python.net (Thomas Heller)
Date: Wed, 13 May 2009 20:58:10 +0200
Subject: json vs. simplejson
In-Reply-To: <mailman.97.1242237243.8015.python-list@python.org>
References: <76vqi5F1eq4rjU1@mid.individual.net>	<76vr3uF1ejv91U1@mid.uni-berlin.de>	<76vs9tF1f6c58U1@mid.individual.net>
	<mailman.97.1242237243.8015.python-list@python.org>
Message-ID: <770ji2F1f5a7rU1@mid.individual.net>

Ned Deily schrieb:
> In article <76vs9tF1f6c58U1 at mid.individual.net>,
>  Thomas Heller <theller at python.net> wrote:
>> Diez B. Roggisch schrieb:
>> > Thomas Heller wrote:
>> >> Python 2.6 contains the json module, which I thought was the renamed (and
>> >> improved?) simplejson module that also works on older Python versions.
>> >> 
>> >> However, it seems the json is a lot slower than simplejson.
>> >> This little test, run on Python 2.6.2 and WinXP shows a dramatic
>> >> difference:
>> >>   C:\>py26 -m timeit -s "from json import dumps, loads"
>> >>   "loads(dumps(range(32)))" 1000 loops, best of 3: 618 usec per loop
>> >> 
>> >>   C:\>py26 -m timeit -s "from simplejson import dumps, loads"
>> >>   "loads(dumps(range(32)))" 10000 loops, best of 3: 31 usec per loop> >> 
>> >> Does anyone have an explanation for that?
>> > 
>> > Dunno about json, but simplejson comes with an (optional) C-based
>> > speedup-module.
>> > 
>> > Maybe this isn't part of the standard distribution? 
>> json has it's own _json speedup module.  And funny, on Linux, json
>> WITH _json is still somewhat slower (~10%) than simplejson WITHOUT
>> the _speedups module.
> 
> According to the svn history in 2.6, the json module was a copy of 
> simplejson 1.9.  The current version of simplejson is 2.0.9 and, 
> according to its CHANGES.txt, there have been a number of performance 
> improvements in the various releases since 1.9.  Looks like the trunk 
> (2.7) version of json has been updated to the latest simplejson.
> 

Ok, thanks.  I've submitted a bug for python2.6, but it seems they
will not upgrade to a newer version.
<http://bugs.python.org/issue6013>

Thomas


From debatem1 at gmail.com  Wed May 13 15:27:53 2009
From: debatem1 at gmail.com (CTO)
Date: Wed, 13 May 2009 12:27:53 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com> 
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com> 
	<98ea5010-2eab-43de-b5a2-d4f79a06f25e@z19g2000vbz.googlegroups.com>
Message-ID: <50902c22-df00-4fb8-bc7b-1f596387ea32@j12g2000vbl.googlegroups.com>

On May 13, 8:19?am, bearophileH... at lycos.com wrote:
> godshorse, you may use the "shortestPaths" method of this graph class
> of mine:http://sourceforge.net/projects/pynetwork/
>
> (It uses the same Dijkstra code by Eppstein).
> (Once you have all distances from a node to the other ones, it's not
> too much difficult to find the tree you talk about).
>
> Also see the Minimum spanning tree:http://en.wikipedia.org/wiki/Minimum_spanning_tree
>
> Bye,
> bearophile

Let me add a caution to what bearophile says here- a minimum spanning
tree minimizes
the weight of the *whole tree*, not the individual paths in that tree,
which seems
to be what you're going after. Those can be pretty different things.

Geremy Condra


From ajaksu at gmail.com  Wed May 13 15:42:24 2009
From: ajaksu at gmail.com (ajaksu)
Date: Wed, 13 May 2009 12:42:24 -0700 (PDT)
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
References: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>
	<51d1dd3f-322d-47fa-9d44-75b92c6ef4e2@e20g2000vbc.googlegroups.com>
Message-ID: <2003c02c-6a9f-40fb-b19c-30625ed09eb0@s21g2000vbb.googlegroups.com>

henning.vonbar wrote:
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> ? File "/usr/local/lib/python2.6/threading.py", line 952, in _test
> ? ? t.start()
> ? File "/usr/local/lib/python2.6/threading.py", line 471, in start
> ? ? _start_new_thread(self.__bootstrap, ())
> thread.error: can't start new thread

What do you get with:
import thread
thread.start_new_thread(int, ('1',2))

?

Daniel


From gunterhenriksen at gmail.com  Wed May 13 15:49:05 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Wed, 13 May 2009 12:49:05 -0700
Subject: x.abc vs x['abc']
Message-ID: <ab4fa3490905131249q16d608f5t67131c435603a38f@mail.gmail.com>

Presuming it is very common to have objects created
on the fly using some sort of external data
definitions, is there an obvious common standard
way to take a dict object and create an object
whose attribute names are the keys from the dict?

I realize I can do something like:

>>> d = {"hello": "world"}
>>> x = type("", (object,), d)()
>>> x.hello
world

but that seems like an arcane way to do something
which would ideally be transparent... if there is
a function in the standard library, that would be
good, even if I have to import it.  I guess there is
collections.namedtuple... that would not look much
prettier... but the main thing to me is for it to
be the same way everybody else does it.  I do not
prefer the new object be a dict, but it would be ok.


From lists at cheimes.de  Wed May 13 16:00:23 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 13 May 2009 22:00:23 +0200
Subject: x.abc vs x['abc']
In-Reply-To: <ab4fa3490905131249q16d608f5t67131c435603a38f@mail.gmail.com>
References: <ab4fa3490905131249q16d608f5t67131c435603a38f@mail.gmail.com>
Message-ID: <guf8so$oii$1@ger.gmane.org>

Gunter Henriksen wrote:
> but that seems like an arcane way to do something
> which would ideally be transparent... if there is
> a function in the standard library, that would be
> good, even if I have to import it.  I guess there is
> collections.namedtuple... that would not look much
> prettier... but the main thing to me is for it to
> be the same way everybody else does it.  I do not
> prefer the new object be a dict, but it would be ok.

Most objects have an attribute called '__dict__' that acts as a
container for the attributes of an object.

>>> class Container(object):
...     pass
...
>>> container = Container()
>>> d = {"hello": "world"}
>>> container.__dict__.update(d)
>>> container.hello
'world'

You can also implemenet __getattr__() like:

    def __getattr__(self, name):
        try:
            return self.data[name]
        except KeyError:
            raise AttributeError(name)

HTH

Christian



From clp2 at rebertia.com  Wed May 13 16:53:37 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 13 May 2009 13:53:37 -0700
Subject: x.abc vs x['abc']
In-Reply-To: <guf8so$oii$1@ger.gmane.org>
References: <ab4fa3490905131249q16d608f5t67131c435603a38f@mail.gmail.com>
	<guf8so$oii$1@ger.gmane.org>
Message-ID: <50697b2c0905131353l126d9aaas7a3e0ac0d57e789d@mail.gmail.com>

On Wed, May 13, 2009 at 1:00 PM, Christian Heimes <lists at cheimes.de> wrote:
> Gunter Henriksen wrote:
>> but that seems like an arcane way to do something
>> which would ideally be transparent... if there is
>> a function in the standard library, that would be
>> good, even if I have to import it. ?I guess there is
>> collections.namedtuple... that would not look much
>> prettier... but the main thing to me is for it to
>> be the same way everybody else does it. ?I do not
>> prefer the new object be a dict, but it would be ok.
>
> Most objects have an attribute called '__dict__' that acts as a
> container for the attributes of an object.
>
>>>> class Container(object):
> ... ? ? pass
> ...
>>>> container = Container()
>>>> d = {"hello": "world"}
>>>> container.__dict__.update(d)
>>>> container.hello
> 'world'
>
> You can also implemenet __getattr__() like:
>
> ? ?def __getattr__(self, name):
> ? ? ? ?try:
> ? ? ? ? ? ?return self.data[name]
> ? ? ? ?except KeyError:
> ? ? ? ? ? ?raise AttributeError(name)

See also the `namedtuple` type in the `collections` module:
http://docs.python.org/library/collections.html#collections.namedtuple

Cheers,
Chris
-- 
http://blog.rebertia.com


From norseman at hughes.net  Wed May 13 16:55:51 2009
From: norseman at hughes.net (norseman)
Date: Wed, 13 May 2009 13:55:51 -0700
Subject: about Python doc reader
In-Reply-To: <1e364c4e0905130537u472cf2c8v24ab3eb725e8199d@mail.gmail.com>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>
	<1e364c4e0905130537u472cf2c8v24ab3eb725e8199d@mail.gmail.com>
Message-ID: <4A0B33D7.8000002@hughes.net>

Kushal Kumaran wrote:
> On Wed, May 13, 2009 at 4:28 PM, Shailja Gulati <shailja.gulati at tcs.com> wrote:
>> Hi ,
>>
>> I am currently working on "Information retrieval from semi structured
>> Documents" in which there is a need to read data from Resumes.
>>
>> Could anyone tell me is there any python API to read Word doc?
>>
> 
> If you're using Windows, you can use COM APIs to read Word documents.
> Or you can use OpenOffice.org using uno.  You can find examples of
> either by googling.
> 
============================
One problem that I keep getting with OOo an UNO and python. When asked 
to output a .txt file it comes out sorta pk-zipped. Same for .csv files 
it outputs.  If you can, I suggest you work with Microsoft's COM. I have 
had better luck there.  Not much, but better.  Usually get a real .txt

For what it is worth, in OOo I did have some progress by creating a 
macro to write out text in it and setting it to run on EVERY file it 
opens and ten close OOo after the write. Then batched the  OOo file.doc 
process with a:

files2process.sh            #files2process.bat  in window$
================
swriter file1.doc
swriter file2.doc
.
.

not very elegant, but it worked for me.


To be honest - I just give those to a clerk and let them point and click 
until done these days.  Less frustrating.  Documentation bad for each.


Steve


From clp2 at rebertia.com  Wed May 13 16:58:36 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 13 May 2009 13:58:36 -0700
Subject: New to python, can i ask for a little help?
In-Reply-To: <5638a6de-d07e-48a0-be73-37d81a2ba6cc@y33g2000prg.googlegroups.com>
References: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
	<mailman.72.1242188827.8015.python-list@python.org>
	<5638a6de-d07e-48a0-be73-37d81a2ba6cc@y33g2000prg.googlegroups.com>
Message-ID: <50697b2c0905131358q1399019bsa5417335a19af1a5@mail.gmail.com>

On Wed, May 13, 2009 at 12:22 PM, warhammer1805 at gmail.com
<warhammer1805 at gmail.com> wrote:
> On May 12, 9:27?pm, Chris Rebert <c... at rebertia.com> wrote:
>> On Tue, May 12, 2009 at 9:18 PM, warhammer1... at gmail.com
>>
>>
>>
>> <warhammer1... at gmail.com> wrote:
>> > I loaded python 3.1
>> > I can use the gui and i see the following:
>>
>> > Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
>> > (Intel)] on win32
>> > Type "copyright", "credits" or "license()" for more information.
>>
>> > It would seem that this is working correctly and there is no path
>> > problem.
>> > I am running windows vista.
>>
>> > When i put in a test string i see this:
>>
>> > Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
>> > (Intel)] on win32
>> > Type "copyright", "credits" or "license()" for more information.
>> >>>> print "hello world!"
>> > SyntaxError: invalid syntax (<pyshell#0>, line 1)
>>
>> > Can anyone tell me what is wrong? I didnt expect that error....
>>
>> The print-statement was removed in Python 3.0. Now it's just a
>> function. You'll have to use:
>>
>> print("hello world!")
>>
>> instead.
>>
>> Please also read the 3.0 transition docs:http://docs.python.org/3.0/whatsnew/3.0.html
>> Note that Python 3.0 differs significantly from Python 2.x
>>
>> Cheers,
>> Chris
>> --http://blog.rebertia.com
>
> Hi Chris,
> Thank you for the pointer! that sure helped alot.
> Do you think i should be using a different version of python? I dont
> normally do much programming. I used to do some C along time ago. I
> want to get into something again and python seems to be popular.

You should probably use Python v2.6 instead for the time being; most
libraries have yet to be ported to Python 3.0, so 2.6 has many more
libraries available for it currently. Python 3.0 is also mostly the
same as 2.6, so learning 2.6 won't be a waste of time and will help
you when the full transition to 3.0 is eventually made.

> Could you also tell me who uses python in IT areas? I see alot of
> python and Mysql. And i see python developer jobs as standalone too.

See http://www.python.org/about/apps/ and http://www.python.org/about/success/

Cheers,
Chris
-- 
http://blog.rebertia.com


From norseman at hughes.net  Wed May 13 17:00:58 2009
From: norseman at hughes.net (norseman)
Date: Wed, 13 May 2009 14:00:58 -0700
Subject: about Python doc reader
In-Reply-To: <4A0AC4C7.1060000@timgolden.me.uk>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>
	<4A0AC4C7.1060000@timgolden.me.uk>
Message-ID: <4A0B350A.7040006@hughes.net>

Tim Golden wrote:
> Shailja Gulati wrote:
>> Hi ,
>>
>> I am currently working on "Information retrieval from semi structured 
>> Documents" in which there is a need to read data from Resumes.
>>
>> Could anyone tell me is there any python API to read Word doc?
> 
> If you haven't already, get hold of the pywin32 extensions:
> 
>  http://pywin32.sf.net
> 
> <code>
> import win32com.client
> 
> doc = win32com.client.GetObject ("c:/temp/temp.doc")
> text = doc.Range ().Text
> 
> </code>
> 
> Note that this will give you a unicode object with \r line-delimiters.
> You could read para by para if that were more useful:
> 
> <code>
> import win32com.client
> 
> doc = win32com.client.GetObject ("c:/temp/temp.doc")
> lines = [p.Range () for p in doc.Paragraphs]
> 
> </code>
> 
> TJG
=======================
I saw this right after responding to Kushal's 5:37AM today posting.

Thank you for the tip.  I'll try these first chance I get.
Word, swriter, whatever - I'm not partial when it comes to automating.


Today is: 20090513

Steve


From norseman at hughes.net  Wed May 13 17:48:47 2009
From: norseman at hughes.net (norseman)
Date: Wed, 13 May 2009 14:48:47 -0700
Subject: about Python doc reader
In-Reply-To: <4A0B350A.7040006@hughes.net>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>	<4A0AC4C7.1060000@timgolden.me.uk>
	<4A0B350A.7040006@hughes.net>
Message-ID: <4A0B403F.2090806@hughes.net>

norseman wrote:
> Tim Golden wrote:
>> Shailja Gulati wrote:
>>> Hi ,
>>>
>>> I am currently working on "Information retrieval from semi structured 
>>> Documents" in which there is a need to read data from Resumes.
>>>
>>> Could anyone tell me is there any python API to read Word doc?
>>
>> If you haven't already, get hold of the pywin32 extensions:
>>
>>  http://pywin32.sf.net
>>
>> <code>
>> import win32com.client
>>
>> doc = win32com.client.GetObject ("c:/temp/temp.doc")
>> text = doc.Range ().Text
>>
>> </code>
>>
>> Note that this will give you a unicode object with \r line-delimiters.
>> You could read para by para if that were more useful:
>>
>> <code>
>> import win32com.client
>>
>> doc = win32com.client.GetObject ("c:/temp/temp.doc")
>> lines = [p.Range () for p in doc.Paragraphs]
>>
>> </code>
>>
>> TJG
> =======================
> I saw this right after responding to Kushal's 5:37AM today posting.
> 
> Thank you for the tip.  I'll try these first chance I get.
> Word, swriter, whatever - I'm not partial when it comes to automating.
> 
> 
> Today is: 20090513
> 
> Steve
================================
Interesting:

I did try these.

Doc at once:
outputs two x'0D' and the file.  Then it appends x'0D' x'0D' x'0A' x'0D' 
x'0A' to end of file even though source file itself has no EOL.
( EOL is EndOfLine  aka newline )

That's  cr cr             There are two blank lines at begining.
         cr cr lf cr lf    There is no EOL in source
                           Any idea what those are about?
One crlf is probably from python's print text, but the other?

The lines=
appends   [u'\r', u'\r', u"  to begining of output
and   \r"]x'0D'x'0A'   to the end even though there is no EOL in source.

output is understood:    u'\r'  is Apple EOL
the crlf is probably from print lines.

Programmers searching for specifics take note. The output is cooked.
I don't have any "weird things" in the test file. (no font changes, no 
subscripts, etc)  Might be best to take a real good look at a test file 
before assuming anything.

But, having an idea of what the extras are makes it somewhat easier to 
allow for.


Steve


From socyl at 987jk.com.invalid  Wed May 13 17:50:41 2009
From: socyl at 987jk.com.invalid (kj)
Date: Wed, 13 May 2009 21:50:41 +0000 (UTC)
Subject: How to get all named args in a dict?
Message-ID: <guffbh$7do$1@reader1.panix.com>



Suppose I have the following:

def foo(x=None, y=None, z=None):
    d = {"x": x, "y": y, "z": z}
    return bar(d)

I.e. foo takes a whole bunch of named arguments and ends up calling
a function bar that takes a single dictionary as argument, and this
dictionary has the same keys as in foo's signature, so to speak.

Is there some builtin variable that would be the same as the variable
d, and would thus obviate the need to explicitly bind d?

Thanks!

kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From e.kroske at gmail.com  Wed May 13 17:51:28 2009
From: e.kroske at gmail.com (Evan Kroske)
Date: Wed, 13 May 2009 17:51:28 -0400
Subject: Odd list behavior
Message-ID: <4A0B40E0.2060600@gmail.com>

I'm working on a simple file processing utility, and I encountered a 
weird error. If I try to get the first element of a list I'm splitting 
from a string, I get an error:

key = string.split()[0]
Error!

However, I can slice the list like normal, but that gives me a 
one-element-long list:

key = string.split()[:1]
Success!

Finally, the operation works perfectly if I initialize the list beforehand:

list = string.split()
key = list[0]
Success!

Why does this happen?
-- |
Evan Kroske
Welcome2Obscurity.Blogspot.com <http://welcome2obscurity.blogspot.com>
Glory is fleeting, but obscurity is forever. ? some French guy |


From clp2 at rebertia.com  Wed May 13 17:59:39 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 13 May 2009 14:59:39 -0700
Subject: How to get all named args in a dict?
In-Reply-To: <guffbh$7do$1@reader1.panix.com>
References: <guffbh$7do$1@reader1.panix.com>
Message-ID: <50697b2c0905131459l2903cc2bpd0108080d7bf2f5c@mail.gmail.com>

On Wed, May 13, 2009 at 2:50 PM, kj <socyl at 987jk.com.invalid> wrote:
>
>
> Suppose I have the following:
>
> def foo(x=None, y=None, z=None):
> ? ?d = {"x": x, "y": y, "z": z}
> ? ?return bar(d)
>
> I.e. foo takes a whole bunch of named arguments and ends up calling
> a function bar that takes a single dictionary as argument, and this
> dictionary has the same keys as in foo's signature, so to speak.
>
> Is there some builtin variable that would be the same as the variable
> d, and would thus obviate the need to explicitly bind d?

def foo(**kwargs):
    return bar(kwargs)

I would suggest you read the Python tutorial.

Cheers,
Chris
-- 
http://blog.rebertia.com


From clp2 at rebertia.com  Wed May 13 18:05:10 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 13 May 2009 15:05:10 -0700
Subject: Odd list behavior
In-Reply-To: <4A0B40E0.2060600@gmail.com>
References: <4A0B40E0.2060600@gmail.com>
Message-ID: <50697b2c0905131505q5bc24d78x6b2a4acb628c77de@mail.gmail.com>

On Wed, May 13, 2009 at 2:51 PM, Evan Kroske <e.kroske at gmail.com> wrote:
> I'm working on a simple file processing utility, and I encountered a weird
> error. If I try to get the first element of a list I'm splitting from a
> string, I get an error:
>
> key = string.split()[0]
> Error!
>
> However, I can slice the list like normal, but that gives me a
> one-element-long list:
>
> key = string.split()[:1]
> Success!
>
> Finally, the operation works perfectly if I initialize the list beforehand:
>
> list = string.split()
> key = list[0]
> Success!
>
> Why does this happen?

Please include the actual error messages and Tracebacks in the future.
"Error!" and "Success!" aren't much to go on; and answering your
question without further information is just a guessing game at best.

Cheers,
Chris
-- 
http://blog.rebertia.com


From norseman at hughes.net  Wed May 13 18:08:26 2009
From: norseman at hughes.net (norseman)
Date: Wed, 13 May 2009 15:08:26 -0700
Subject: Odd list behavior
In-Reply-To: <4A0B40E0.2060600@gmail.com>
References: <4A0B40E0.2060600@gmail.com>
Message-ID: <4A0B44DA.2040107@hughes.net>

Evan Kroske wrote:
> I'm working on a simple file processing utility, and I encountered a 
> weird error. If I try to get the first element of a list I'm splitting 
> from a string, I get an error:
> 
> key = string.split()[0]
> Error!
> 
> However, I can slice the list like normal, but that gives me a 
> one-element-long list:
> 
> key = string.split()[:1]
> Success!
> 
> Finally, the operation works perfectly if I initialize the list beforehand:
> 
> list = string.split()
> key = list[0]
> Success!
> 
> Why does this happen?
> -- |
> Evan Kroske
> Welcome2Obscurity.Blogspot.com <http://welcome2obscurity.blogspot.com>
> Glory is fleeting, but obscurity is forever. ? some French guy |

==========================
Take a look at the  split() command.

I think you will find you need one var on the left side for each piece 
on the right.

a="x y"
b,c= a.split()
b
x
c
y


Maybe???


Steve


From rhodri at wildebst.demon.co.uk  Wed May 13 18:20:31 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 13 May 2009 23:20:31 +0100
Subject: n00b question: Possible to pass lists to a Template class?
In-Reply-To: <5cdc08d7-c9d9-415d-9ae8-5a67cd94dbc4@s28g2000vbp.googlegroups.com>
References: <cc34bfbc-e6a8-47ed-af95-adf0d42cf9e2@t11g2000vbc.googlegroups.com>
	<5cdc08d7-c9d9-415d-9ae8-5a67cd94dbc4@s28g2000vbp.googlegroups.com>
Message-ID: <op.utv20hp0a8ncjz@gnudebst>

On Wed, 13 May 2009 17:22:32 +0100, Wells <wells at submute.net> wrote:

> On May 13, 11:14?am, Wells <we... at submute.net> wrote:
>> Is it possible to pass a list to the Template.substitute method and
>> use that in the template, like so..
>>
>> g = string.Template(gametemplate)
>> print g.substitute(recap = "none", winner = game["winner"], loser =
>> game["loser"])
>>
>> Then in the template...
>>
>> <b>winner.team
>>
>> Where winner.team would be the value of game["winner"]["team"].
>>
>> Thanks!
>
> Sorry, I meant dicts, not lists. Like I said, n00b question.

Basically, no.  Substituted values are effectively put into the
template with '%s' substitution, so you'll just get a string
representation of your dictionary.  You could play around with
defining your own custom Template class, but it's probably not
worth the effort.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From __peter__ at web.de  Wed May 13 18:23:47 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 14 May 2009 00:23:47 +0200
Subject: Odd list behavior
References: <mailman.105.1242251505.8015.python-list@python.org>
Message-ID: <gufh9g$a49$03$1@news.t-online.com>

Evan Kroske wrote:

> I'm working on a simple file processing utility, and I encountered a
> weird error. If I try to get the first element of a list I'm splitting
> from a string, I get an error:
> 
> key = string.split()[0]
> Error!

When string contains only whitespace string.split() returns an empty list an 
then

>>> [][0]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list index out of range

> However, I can slice the list like normal, but that gives me a
> one-element-long list:
> 
> key = string.split()[:1]
> Success!

The slice length may be shorter than specified:

>>> [][:1]
[]


> Finally, the operation works perfectly if I initialize the list
> beforehand:
> 
> list = string.split()
> key = list[0]
> Success!

Not with the same string as in your previous examples.

Peter



From emile at fenx.com  Wed May 13 18:24:27 2009
From: emile at fenx.com (Emile van Sebille)
Date: Wed, 13 May 2009 15:24:27 -0700
Subject: Odd list behavior
In-Reply-To: <4A0B40E0.2060600@gmail.com>
References: <4A0B40E0.2060600@gmail.com>
Message-ID: <gufhav$j7p$1@ger.gmane.org>

On 5/13/2009 2:51 PM Evan Kroske said...
> I'm working on a simple file processing utility, and I encountered a 
> weird error. If I try to get the first element of a list I'm splitting 
> from a string, 


What value of string gives these results?

Emile


> I get an error:
> 
> key = string.split()[0]
> Error!
> 
> However, I can slice the list like normal, but that gives me a 
> one-element-long list:
> 
> key = string.split()[:1]
> Success!
> 
> Finally, the operation works perfectly if I initialize the list beforehand:
> 
> list = string.split()
> key = list[0]
> Success!
> 
> Why does this happen?
> -- |
> Evan Kroske
> Welcome2Obscurity.Blogspot.com <http://welcome2obscurity.blogspot.com>
> Glory is fleeting, but obscurity is forever. ? some French guy |



From rhodri at wildebst.demon.co.uk  Wed May 13 18:24:38 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 13 May 2009 23:24:38 +0100
Subject: Odd list behavior
In-Reply-To: <4A0B44DA.2040107@hughes.net>
References: <4A0B40E0.2060600@gmail.com> <4A0B44DA.2040107@hughes.net>
Message-ID: <op.utv27casa8ncjz@gnudebst>

On Wed, 13 May 2009 23:08:26 +0100, norseman <norseman at hughes.net> wrote:

> Evan Kroske wrote:
>> I'm working on a simple file processing utility, and I encountered a  
>> weird error. If I try to get the first element of a list I'm splitting  
>> from a string, I get an error:
>>  key = string.split()[0]
>> Error!
>>  However, I can slice the list like normal, but that gives me a  
>> one-element-long list:
>>  key = string.split()[:1]
>> Success!
>>  Finally, the operation works perfectly if I initialize the list  
>> beforehand:
>>  list = string.split()
>> key = list[0]
>> Success!
>>  Why does this happen?

>
> ==========================
> Take a look at the  split() command.
>
> I think you will find you need one var on the left side for each piece  
> on the right.

Given that he's immediately indexing the split results, that's irrelevant.
There's no point in even guessing with out the traceback.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From skippy.hammond at gmail.com  Wed May 13 18:33:12 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Thu, 14 May 2009 08:33:12 +1000
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <64fc05ead382d1a8490deb9a07bd5f01@preisshare.net>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>	<mailman.22.1242108050.8015.python-list@python.org>	<02oOl.710$wR5.489@nwrddc02.gnilink.net>	<mailman.65.1242174135.8015.python-list@python.org>	<4a0a3f40$0$24009$9b622d9e@news.freenet.de>
	<64fc05ead382d1a8490deb9a07bd5f01@preisshare.net>
Message-ID: <4A0B4AA8.2090703@gmail.com>

On 13/05/2009 2:18 PM, David Lyon wrote:
> On Wed, 13 May 2009 05:32:16 +0200, "Martin v. L?wis"<martin at v.loewis.de>
> wrote:
>
>> I think this was a case of obscure misconfiguration of the system.
>> It is always possible to configure a system in such a way that even
>> the most resilient installation procedure will break.
>
> Technically, you are right..
>
> but imho.. windows installers are overkill and shouldn't be used
> for this sort of thing. That is, installing libraries. And not
> the fault of the package authors either...

But if PYTHONPATH was set incorrectly it really doesn't matter how 
Python was installed, it would still fail.  The installer didn't set 
PYTHONPATH, a human did.

Cheers,

Mark


From agaskins_ng at kelleramerica.com  Wed May 13 18:36:07 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Wed, 13 May 2009 18:36:07 -0400
Subject: When *don't* I use 'self' in classes?
Message-ID: <rXHOl.41113$5N7.8212@newsfe09.iad>

I am a bit confused as too when, if ever, it is not appropriate to prepend 
'self' to objects in a class. All of the examples of how to use 'self' that 
I find seem to be short and very simple (as examples tent to be). I 
appologize if I am asking an ignorant question here, but I want to get off 
on the right foot. Here's an example of what I mean:

import serial
class foo:
    def __init(self, comport):
        self.comport = comport
        self.baudrate = 9600 #default
        self.ser = serial
        try:
            self.ser.Serial()
            self.ser.baudrate = self.baudrate
            self.ser.open()
        except:
            print 'Serial port could not be opened'

=== OR ===
import serial
class foo:
    def __init(self, comport):
        self.comport = comport
        self.baudrate = 9600 #default
        try:
            ser = serial.Serial()
            ser.baudrate = self.baudrate
            ser.open()
        except:
            print 'Serial port could not be opened'

There may be a typo in here, this is just a random example similar to 
something I'm working with, but which one of these are more 'proper'? If I 
am importing a library do I still prepend it's object with self when I use 
it in my class? I suppose my question is just basically... when do you NOT 
prepent an object in a class with 'self'?

I'm not even sure I'm using the term 'object' correctly here. Feel free to 
set me straight, but I hope my example makes it clear what I am asking.

Thanks a lot, this ng has already been super helpful as I take my 
crash-course in to python! :P 




From tjreedy at udel.edu  Wed May 13 18:42:56 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 13 May 2009 18:42:56 -0400
Subject: How to get all named args in a dict?
In-Reply-To: <guffbh$7do$1@reader1.panix.com>
References: <guffbh$7do$1@reader1.panix.com>
Message-ID: <gufidh$m34$1@ger.gmane.org>

kj wrote:
> 
> Suppose I have the following:
> 
> def foo(x=None, y=None, z=None):
>     d = {"x": x, "y": y, "z": z}
>     return bar(d)
> 
> I.e. foo takes a whole bunch of named arguments and ends up calling
> a function bar that takes a single dictionary as argument, and this
> dictionary has the same keys as in foo's signature, so to speak.
> 
> Is there some builtin variable that would be the same as the variable
> d, and would thus obviate the need to explicitly bind d?

Use the built-in function locals()
 >>> def f(a,b):
	x=locals()
	print(x)

 >>> f(1,2)
{'a': 1, 'b': 2}



From rtw at freenet.co.uk  Wed May 13 18:46:16 2009
From: rtw at freenet.co.uk (Rob Williscroft)
Date: Wed, 13 May 2009 17:46:16 -0500
Subject: sqlite single transaction without foreign key or triggers
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
	<guao50$1jv$1@panix3.panix.com>
	<Xns9C09513903E8FrtwfreenetREMOVEcouk@216.196.109.145>
	<gud8pj$b3g$1@panix3.panix.com>
	<b722bd36-c8f1-4cdf-8625-2550cee21511@i28g2000prd.googlegroups.com>
Message-ID: <Xns9C0AF2325396FrtwfreenetREMOVEcouk@216.196.109.145>

John Machin wrote in news:b722bd36-c8f1-4cdf-8625-2550cee21511
@i28g2000prd.googlegroups.com in comp.lang.python:

> On May 13, 11:46?am, a... at pythoncraft.com (Aahz) wrote:
>> In article <Xns9C09513903E8FrtwfreenetREMOVEc... at 216.196.109.145>,
>> Rob Williscroft ?<r... at freenet.co.uk> wrote:
>>
>>
>>
>> >Aahz wrote innews:guao50$1jv$1 at panix3.panix.comin comp.lang.python:
>> >> In article <Xns9C08E179B66D8rtwfreenetREMOVEc... at 216.196.109.145>,
>> >> Rob Williscroft ?<r... at freenet.co.uk> wrote:
>>
>> >>>db.execute( '''
>> >>> ? ? ? ? update "sessions" set "uid" = ?
>> >>> ? ? ? ? where "uid" = ?
>> >>> ? ? ? ? and exists(
>> >>> ? ? ? ? ? ? ? ? ?select * from "users" where "uid" > = ?
>> >>> ? ? ? ? ? )
>> >>> ? ?''',
>> >>> ? ?(v['uid'],s.SID, v['uid'])
>> >>> ?)
>>
>> >> This will be more efficient if you do "select uid from users".
>>
>> >What will be more efficient ?
>>
>> >Do you mean the "select * ..." or do you want to take the exists
>> >sub-query out and put it in a python if ?
>>
>> "select uid" will be more efficient than "select *", although I
>> suppose I could be wrong about that given how little I know about
>> current query optimizers.

It seems the usual advice about premeture optimisation should apply,
namely write clear code (*), then optimise the bottlenecks when you 
actualy find you need to.

*) for some definition of "clear code".

> My take is that it won't matter what you select if the optimiser is
> smart enough; something that requires minimal resources to produce is
> indicated in case the optimiser is dumb:
> 
>  ... exists (select 1 from ... )

I have to maintain some code writen by someone who thinks replacing 
"*" in queries with "1" is always a good idea (you know just in case), 
he wrote: 

    	select count(1) from ...

of course it didn't do what he thought it did.

Rob.
-- 
http://www.victim-prime.dsl.pipex.com/


From rhodri at wildebst.demon.co.uk  Wed May 13 19:03:41 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 14 May 2009 00:03:41 +0100
Subject: When *don't* I use 'self' in classes?
In-Reply-To: <rXHOl.41113$5N7.8212@newsfe09.iad>
References: <rXHOl.41113$5N7.8212@newsfe09.iad>
Message-ID: <op.utv40fqqa8ncjz@gnudebst>

On Wed, 13 May 2009 23:36:07 +0100, Adam Gaskins  
<agaskins_ng at kelleramerica.com> wrote:

> I am a bit confused as too when, if ever, it is not appropriate to  
> prepend
> 'self' to objects in a class. All of the examples of how to use 'self'  
> that
> I find seem to be short and very simple (as examples tent to be). I
> appologize if I am asking an ignorant question here, but I want to get  
> off
> on the right foot. Here's an example of what I mean:
>
> import serial
> class foo:
>     def __init(self, comport):
>         self.comport = comport
>         self.baudrate = 9600 #default
>         self.ser = serial
>         try:
>             self.ser.Serial()
>             self.ser.baudrate = self.baudrate
>             self.ser.open()
>         except:
>             print 'Serial port could not be opened'
>
> === OR ===
> import serial
> class foo:
>     def __init(self, comport):
>         self.comport = comport
>         self.baudrate = 9600 #default
>         try:
>             ser = serial.Serial()
>             ser.baudrate = self.baudrate
>             ser.open()
>         except:
>             print 'Serial port could not be opened'
>
> There may be a typo in here, this is just a random example similar to
> something I'm working with, but which one of these are more 'proper'? If  
> I am importing a library do I still prepend it's object with self when I  
> use it in my class? I suppose my question is just basically... when do  
> you NOT prepent an object in a class with 'self'?
>
> I'm not even sure I'm using the term 'object' correctly here. Feel free  
> to set me straight, but I hope my example makes it clear what I am  
> asking.

Prepending "self" to an identifier means that what you are using is an
attribute of the class instance that you're dealing with; i.e. you're
attaching the object to the instance.  Whether or not you want to do that
depends entirely on whether you expect to use that object ever again, or
whether you're using it once and tossing it away.

For the example you give, you're most likely to want to do neither of
the above.  The first version gives you access to the entire namespace
of the "serial" module as an attribute of instances of the class "foo",
which is unlikely to be what you want.  The second, on the other hand,
creates and opens a serial port, then throws it away.  It's more likely
that you'll want something like this:

import serial
class foo:
     def __init__(self, comport):
         self.comport = comport
         self.baudrate = 9600
         try:
             self.ser = serial.Serial()
             self.ser.baudrate = self.baudrate
             self.ser.open()
         except:
             print 'Serial port could not be opened'

     def send_data(self, data):
         self.ser.write(data)

(except that a bare 'except' like that is a very bad idea (you'll catch
keyboard interrupts and the like), but let's assume that you're doing
something more detailed for the purposes of this example.)

As you can see, making the serial port itself an attribute allows you
to use it in other methods.  If you had just used "ser" as in your
second example, it would be a local variable to the method foo.__init__(),
so it would vanish when __init__ returned just like any other local
variable.  Making it an attribute keeps it around (attached to just
that one instance of the class) so that you can use it later.

In general, don't make something an attribute if you know you're never
going to reuse it.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From google at mrabarnett.plus.com  Wed May 13 19:10:35 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 00:10:35 +0100
Subject: n00b question: Possible to pass lists to a Template class?
In-Reply-To: <op.utv20hp0a8ncjz@gnudebst>
References: <cc34bfbc-e6a8-47ed-af95-adf0d42cf9e2@t11g2000vbc.googlegroups.com>	<5cdc08d7-c9d9-415d-9ae8-5a67cd94dbc4@s28g2000vbp.googlegroups.com>
	<op.utv20hp0a8ncjz@gnudebst>
Message-ID: <4A0B536B.4050500@mrabarnett.plus.com>

Rhodri James wrote:
> On Wed, 13 May 2009 17:22:32 +0100, Wells <wells at submute.net> wrote:
> 
>> On May 13, 11:14 am, Wells <we... at submute.net> wrote:
>>> Is it possible to pass a list to the Template.substitute method and
>>> use that in the template, like so..
>>>
>>> g = string.Template(gametemplate)
>>> print g.substitute(recap = "none", winner = game["winner"], loser =
>>> game["loser"])
>>>
>>> Then in the template...
>>>
>>> <b>winner.team
>>>
>>> Where winner.team would be the value of game["winner"]["team"].
>>>
>>> Thanks!
>>
>> Sorry, I meant dicts, not lists. Like I said, n00b question.
> 
> Basically, no.  Substituted values are effectively put into the
> template with '%s' substitution, so you'll just get a string
> representation of your dictionary.  You could play around with
> defining your own custom Template class, but it's probably not
> worth the effort.
> 
The closest you can get is to pass a dict:

 >>> import string
 >>> s = string.Template("winner is $winner, loser is $loser")
 >>> s.substitute(winner="w", loser="l")
'winner is w, loser is l'
 >>> d = {"winner": "w", "loser": "l"}
 >>> s.substitute(d)
'winner is w, loser is l'



From google at mrabarnett.plus.com  Wed May 13 19:15:32 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 00:15:32 +0100
Subject: When *don't* I use 'self' in classes?
In-Reply-To: <rXHOl.41113$5N7.8212@newsfe09.iad>
References: <rXHOl.41113$5N7.8212@newsfe09.iad>
Message-ID: <4A0B5494.9040304@mrabarnett.plus.com>

Adam Gaskins wrote:
> I am a bit confused as too when, if ever, it is not appropriate to prepend 
> 'self' to objects in a class. All of the examples of how to use 'self' that 
> I find seem to be short and very simple (as examples tent to be). I 
> appologize if I am asking an ignorant question here, but I want to get off 
> on the right foot. Here's an example of what I mean:
> 
> import serial
> class foo:
>     def __init(self, comport):
           ^^^^^^
           Should be '__init__'.

>         self.comport = comport
>         self.baudrate = 9600 #default
>         self.ser = serial
>         try:
>             self.ser.Serial()
>             self.ser.baudrate = self.baudrate
>             self.ser.open()
>         except:
>             print 'Serial port could not be opened'
> 
> === OR ===
> import serial
> class foo:
>     def __init(self, comport):
>         self.comport = comport
>         self.baudrate = 9600 #default
>         try:
>             ser = serial.Serial()
>             ser.baudrate = self.baudrate
>             ser.open()
>         except:
>             print 'Serial port could not be opened'
> 
> There may be a typo in here, this is just a random example similar to 
> something I'm working with, but which one of these are more 'proper'? If I 
> am importing a library do I still prepend it's object with self when I use 
> it in my class? I suppose my question is just basically... when do you NOT 
> prepent an object in a class with 'self'?
> 
> I'm not even sure I'm using the term 'object' correctly here. Feel free to 
> set me straight, but I hope my example makes it clear what I am asking.
> 
> Thanks a lot, this ng has already been super helpful as I take my 
> crash-course in to python! :P 
> 
In the second example 'ser' is just a local variable within '__init__'.


From debatem1 at gmail.com  Wed May 13 19:22:23 2009
From: debatem1 at gmail.com (CTO)
Date: Wed, 13 May 2009 16:22:23 -0700 (PDT)
Subject: How to see the code definiton in the shell ?
References: <89dd3da60905130940l2f3560afx2a7751a354223afc@mail.gmail.com> 
	<mailman.95.1242236086.8015.python-list@python.org>
Message-ID: <f948da49-e539-434b-bec1-6e5c455b60ff@q2g2000vbr.googlegroups.com>

On May 13, 1:26?pm, "J. Cliff Dyer" <j... at sdf.lonestar.org> wrote:
> On Wed, 2009-05-13 at 09:40 -0700, Mohan Parthasarathy wrote:
> > Hi,
>
> > I am new to Python. I tried searching this but could not find an
> > answer. In the interactive shell, I write a new function and I want to
> > be able to see all the code that I wrote at a later time. Just typing
> > the function name only shows
>
> > >>> allmethods
> > <function allmethods at 0x822b0>
>
> > How do I see the actual code ?
>
> > thanks
> > mohan

If you save your function to a file you can. Saying you have the
following
file:

----------------------------
#! /usr/bin/env python3

def f(x, y):
    return x**y

----------------------------

saved as f.py, you can go into the interpreter and do:

>>> import inspect
>>> from f import f
>>> inspect.getsource(f)
'def f(x, y):\n\treturn x**y\n'

However, trying this on a function written in the interpreter
will bail on you.

Geremy Condra


From david at boddie.org.uk  Wed May 13 19:29:01 2009
From: david at boddie.org.uk (David Boddie)
Date: Thu, 14 May 2009 01:29:01 +0200
Subject: Can't run PyQt apps with MacPython
References: <25cdb69b-689c-4cfe-a378-3016b3d50e50@s21g2000vbb.googlegroups.com>
Message-ID: <gufl3t$6t$1@get-news01.get.basefarm.net>

On Wednesday 13 May 2009 17:53, Morad wrote:

> I recently got a new MacBook Pro with Leopard, and would like to
> develop using Python and PyQt. I installed the latest Qt SDK, updated
> MacPython to V 2.5.4 and then proceeded to install SIP and PyQt as
> described in Mark Summerfield's book on PyQt Programming. Everything
> went fine and none of the scripts complained. However when I want to
> run a demo app, I get the error message "Fatal Python error:
> Interpreter not initialized (version mismatch?) / Abort Trap". Anybody
> can help?

This page suggests a possible conflict between installed Python
interpreters:

http://aralbalkan.com/1675/comment-page-1

A post to the PyQt mailing list talks about the correct way to build from
source, but it may not be relevant in this case:

http://www.riverbankcomputing.com/pipermail/pyqt/2006-July/013766.html

It may just be worth checking that SIP and PyQt were built and installed
for the interpreter you expected. Failing that, you might want to ask this
again on the PyQt mailing list:

http://www.riverbankcomputing.com/pipermail/pyqt/

David


From sjmachin at lexicon.net  Wed May 13 19:35:17 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 14 May 2009 09:35:17 +1000
Subject: sqlite single transaction without foreign key or triggers
In-Reply-To: <20090513222136.2A49917005E@sv2-5.per.eftel.com>
References: <d7591495-4661-4243-ad7e-f142d8244e88@e24g2000vbe.googlegroups.com>
	<Xns9C08E179B66D8rtwfreenetREMOVEcouk@216.196.109.145>
	<guao50$1jv$1@panix3.panix.com>
	<Xns9C09513903E8FrtwfreenetREMOVEcouk@216.196.109.145>
	<gud8pj$b3g$1@panix3.panix.com>
	<b722bd36-c8f1-4cdf-8625-2550cee21511@i28g2000prd.googlegroups.com>
	<20090513222136.2A49917005E@sv2-5.per.eftel.com>
Message-ID: <4A0B5935.7080009@lexicon.net>

On 14/05/2009 8:21 AM, Rob Williscroft wrote in private e-mail 
(presumably by mistake):
> On 13 May 2009, you wrote in comp.lang.python:
> 
>> On May 13, 11:46?m, a... at pythoncraft.com (Aahz) wrote:
>>> In article <Xns9C09513903E8FrtwfreenetREMOVEc... at 216.196.109.145>,
>>> Rob Williscroft  <r... at freenet.co.uk> wrote:
>>>
>>>
>>>
>>>> Aahz wrote innews:guao50$1jv$1 at panix3.panix.comin comp.lang.python:
>>>>> In article <Xns9C08E179B66D8rtwfreenetREMOVEc... at 216.196.109.145>,
>>>>> Rob Williscroft  <r... at freenet.co.uk> wrote:
>>>>>> db.execute( '''
>>>>>>         update "sessions" set "uid" = ?
>>>>>>         where "uid" = ?
>>>>>>         and exists(
>>>>>>                 ?elect * from "users" where "uid" > = ?
>>>>>>           )
>>>>>>    ''',
>>>>>>    (v['uid'],s.SID, v['uid'])
>>>>>>  )
>>>>> This will be more efficient if you do "select uid from users".
>>>> What will be more efficient ?
>>>> Do you mean the "select * ..." or do you want to take the exists
>>>> sub-query out and put it in a python if ?
>>> "select uid" will be more efficient than "select *", although I
>>> suppose I could be wrong about that given how little I know about
>>> current query optimizers.
> 
> It seems the usual advice about premeture optimisation should apply,
> namely write clear code (*), then optimise the bottlenecks when you 
> actualy find you need to.

_Deliberately_ writing * instead of some constant is premature potential 
pessimisation and thus an utter nonsense. If you think 1 is obscure, 
then * is likewise obscure; write e.g. 'any_old_constant' instead.

> 
> *) for some definition of "clear code".
> 
>> My take is that it won't matter what you select if the optimiser is
>> smart enough; something that requires minimal resources to produce is
>> indicated in case the optimiser is dumb:
>>
>>  ... exists (select 1 from ... )
> 
> I have to maintain some code writen by someone who thinks replacing 
> "*" in queries with "1" is always a good idea (you know just in case), 
> he wrote: 
> 
>     	select count(1) from ...
> 
> of course it didn't do what he thought it did.

If you really have to maintain code that's been written by weird people 
and not subsequently tested, you have my sympathy. However this is not 
relevant. I am certainly not advocating bulk unthinking replacement of * 
by 1 anywhere in a query.

Cheers,
John



From python.list at tim.thechases.com  Wed May 13 19:39:03 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 13 May 2009 18:39:03 -0500
Subject: When *don't* I use 'self' in classes?
In-Reply-To: <rXHOl.41113$5N7.8212@newsfe09.iad>
References: <rXHOl.41113$5N7.8212@newsfe09.iad>
Message-ID: <4A0B5A17.9010708@tim.thechases.com>

Adam Gaskins wrote:
> I am a bit confused as too when, if ever, it is not appropriate to prepend 
> 'self' to objects in a class. All of the examples of how to use 'self' that 
> I find seem to be short and very simple (as examples tent to be). I 
> appologize if I am asking an ignorant question here, but I want to get off 
> on the right foot. Here's an example of what I mean:
> 
> import serial
> class foo:
>     def __init(self, comport):
>         self.comport = comport
>         self.baudrate = 9600 #default
>         self.ser = serial
>         try:
>             self.ser.Serial()
>             self.ser.baudrate = self.baudrate
>             self.ser.open()
>         except:
>             print 'Serial port could not be opened'
> 
> === OR ===
> import serial
> class foo:
>     def __init(self, comport):
>         self.comport = comport
>         self.baudrate = 9600 #default
>         try:
>             ser = serial.Serial()
>             ser.baudrate = self.baudrate
>             ser.open()
>         except:
>             print 'Serial port could not be opened'
> 
> There may be a typo in here,

Like "__init" instead of "__init__"? :)

> am importing a library do I still prepend it's object with self when I use 
> it in my class? I suppose my question is just basically... when do you NOT 
> prepent an object in a class with 'self'?

Use self.<attribute> when you want the resulting "ser" object to 
live beyond the __init__ call.  Easily seen in this example:

   class Foo:
     def __init__(self):
       self.abc = 42
       xyz = 3.141
       # xyz now falls out of scope

     def test_me(self):
       print self.abc  # succeeds and prints 42
       print xyz       # fails because "xyz" doesn't exist
                       # within this scope

   f = Foo()
   print dir(f)  # has an "abc" but not an "xyz"
   f.test_me()

So in your case, unless you *need* to keep the comport/baudrate 
around, I'd just use
-tim

  DEFAULT_BAUD = 9600
  class Foo:
    def __init__(self, comport):
      self.comport = comport
      try:
        self.ser = Serial()
        self.ser.baudrate = DEFAULT_BAUD
        self.ser.open()
      except SomeSpecificException:
        print "Fail!"

so that the .ser object is available in other method-calls.

-tkc







From steven at REMOVE.THIS.cybersource.com.au  Wed May 13 20:40:14 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 14 May 2009 00:40:14 GMT
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz>
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
	<pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>
	<gue19b$4no$1@lust.ihug.co.nz>
Message-ID: <pan.2009.05.14.00.40.15@REMOVE.THIS.cybersource.com.au>

On Wed, 13 May 2009 20:44:27 +1200, Lawrence D'Oliveiro wrote:

> In message <pan.2009.05.12.09.35.36 at REMOVE.THIS.cybersource.com.au>,
> Steven D'Aprano wrote:
> 
>> On Tue, 12 May 2009 09:20:36 +0000, Steven D'Aprano wrote:
>>
>>> It seems pretty straightforward to me.
>> 
>> Except of course such a pattern won't work ...
> 
> I rest my case.

Gosh, with such shallowness of analysis and out-of-context quoting, how 
could I possibly disagree? You've convinced me utterly.



-- 
Steven


From Graham.Dumpleton at gmail.com  Wed May 13 20:53:20 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Wed, 13 May 2009 17:53:20 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<12ef7b00-f0c5-4030-a353-533d93d23cdd@r3g2000vbp.googlegroups.com> 
	<794f117f-4df5-4c6c-be68-f901959b2579@y10g2000prc.googlegroups.com> 
	<d64eeab4-f07c-4f06-a70c-0c78278b2c2f@r34g2000vba.googlegroups.com> 
	<037bc6d0-3d2e-45bd-91d3-d3051fbfa149@s31g2000vbp.googlegroups.com>
Message-ID: <55f21331-72eb-4c60-a600-93ac563d1639@p6g2000pre.googlegroups.com>

On May 12, 1:59?am, dpapathanasiou <denis.papathanas... at gmail.com>
wrote:
> For the record, and in case anyone else runs into this particular
> problem, here's how resolved it.
>
> My original xml_utils.py was written this way:
>
> from xml.dom import minidom
>
> def parse_item_attribute (item, attribute_name):
> ? ? item_doc = minidom.parseString(item)
> ? ? ...
>
> That version worked under the python interpreter, but failed under
> both mod_python andmod_wsgiapache modules with an error ("Parent
> module 'xml.dom' not loaded").
>
> I found that changing the import statement and the minidom reference
> within the function resolved the problem.
>
> I.e., after rewriting xml_utils.py this way, it works under both
> apache modules as well as in the python interpreter:
>
> import xml.dom.minidom
>
> def parse_item_attribute (item, attribute_name):
> ? ? item_doc = xml.dom.minidom.parseString(item)
> ? ? ...

FWIW, have just seen someone else raising an issue where something
caused problems unless a full package path was used. In that case it
was the 'email' package.

The common thing between these two packages is that they do funny
stuff with sys.modules as part of import.

For 'email' package it is implementing some sort of lazy loader and
aliasing thing to support old names. For 'xml.dom' it seems to replace
the current module with a C extension variant on the fly if the C
extension exists.

Were you getting this issue with xml.dom showing on first request all
the time, or only occasionally occurring? If the latter, were you
running things in a multithreaded configuration and was the server
being loaded with lots of concurrent requests?

For your particular Python installation, does the '_xmlplus' module
exist? Ie., can you import it as '_xmlplus' or 'xml.doc._xmlplus'?

Graham


From jyoung79 at kc.rr.com  Wed May 13 21:18:48 2009
From: jyoung79 at kc.rr.com (jyoung79 at kc.rr.com)
Date: Wed, 13 May 2009 20:18:48 -0500
Subject: Extract EPS info?
Message-ID: <20090514011849.I5Q51.431775.root@hrndva-web02-z01>

Just curious if Python has a built-in module for pulling data out of an EPS 
file?  For example, I'd like to pull the text out of an EPS as well as the font
names of the characters of the text.  I believe I can pull all the font names
from the header area, but was hoping Python might have something
more robust.

Thanks.

Jay


From clp2 at rebertia.com  Wed May 13 22:06:59 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 13 May 2009 19:06:59 -0700
Subject: Proposal to Add New Method to List Object: Mutable Sequence Types
In-Reply-To: <926641.66419.qm@web8408.mail.in.yahoo.com>
References: <926641.66419.qm@web8408.mail.in.yahoo.com>
Message-ID: <50697b2c0905131906uc53562x5f046d60129f6e98@mail.gmail.com>

On Wed, May 13, 2009 at 1:55 AM, VenkataRamaKrishna Boddu
<bvrkchowdary at yahoo.co.in> wrote:
> Hi All,
>
> This is my first mail to python-list.
>
> I just want to propose the idea of introducing a new method for the List
> Object in similar lines of Dictionary Object has_key method.

has_key has been removed in Python 3.0; just use the `in` operator
instead. The `in` operator also works on lists.

Example use:
z = ["a", "b", "c"]
print("b" in z) #==> True
print("d" in z) #==> False

> See my below code, It always produces the ValueError, if I want to check
> whether an item is present or not, then they is no method in the List Object
> (do a "dir(list)").

You were looking for "__contains__"; it's called by the `in` operator.

Cheers,
Chris
-- 
http://blog.rebertia.com

> So., Is it not good, to have a method in List Object, may be something like
> has_item to check whether a item is present or not?
>
> #============== CODE ==============================
> partsOfMyName = ['Python', 'Perl', 'PHP', 'MySQL'];
> ## strSearchKey = 'Perl';
> strSearchKey = 'Prl';
>
> indexofKey = partsOfMyName.index(strSearchKey);
> print 'Index of search key: %s:? %d'%(strSearchKey, indexofKey);
>
> Thanks
> Venkata Rama Krishna Boddu
> ________________________________
> Explore and discover exciting holidays and getaways with Yahoo! India Travel
> Click here!
> --
> http://mail.python.org/mailman/listinfo/python-list


From chedderslam at gmail.com  Wed May 13 23:39:04 2009
From: chedderslam at gmail.com (chedderslam)
Date: Wed, 13 May 2009 20:39:04 -0700 (PDT)
Subject: please help with python program
Message-ID: <950c24b6-abc4-4846-9fb6-224c04399a88@r34g2000vba.googlegroups.com>

I am trying to use Album Cover Art Downloader, software someone
recommended to me.  It works fine on my work computer, but not at
home.

When I try to save the cover art, I get this error:
Traceback (most recent call last):

  File "lib/albumart\albumart_dialog.py", line 623, in
setCoverForItems

  File "lib/albumart\albumart.py", line 194, in setCover

  File "lib/albumart\albumart_target_windows.py", line 56, in setCover

  File "C:\Python24\lib\site-packages\PIL\Image.py", line 1399, in
save

IOError: [Errno 13] Permission denied: u'D:/My Music/Ani DiFranco/
Canon/Disc 1\\folder.jpg'

I have removed the read-only attribute on the folder, and added
"Everyone" with full control for security.  Not sure what else to do.
I would really like to get this working so any help would be
appreciated.

Thanks!


From steven at REMOVE.THIS.cybersource.com.au  Thu May 14 00:01:30 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 14 May 2009 04:01:30 GMT
Subject: please help with python program
References: <950c24b6-abc4-4846-9fb6-224c04399a88@r34g2000vba.googlegroups.com>
Message-ID: <pan.2009.05.14.04.01.30@REMOVE.THIS.cybersource.com.au>

On Wed, 13 May 2009 20:39:04 -0700, chedderslam wrote:

> IOError: [Errno 13] Permission denied: u'D:/My Music/Ani DiFranco/
> Canon/Disc 1\\folder.jpg'
> 
> I have removed the read-only attribute on the folder, and added
> "Everyone" with full control for security.  Not sure what else to do. I
> would really like to get this working so any help would be appreciated.

What about permissions on the file itself?



-- 
Steven


From cmpython at gmail.com  Thu May 14 00:03:47 2009
From: cmpython at gmail.com (CM)
Date: Wed, 13 May 2009 21:03:47 -0700 (PDT)
Subject: When *don't* I use 'self' in classes?
References: <rXHOl.41113$5N7.8212@newsfe09.iad>
Message-ID: <4306df92-dbac-4f75-9dee-8c1c81b06f71@r13g2000vbr.googlegroups.com>

On May 13, 6:36?pm, "Adam Gaskins" <agaskins... at kelleramerica.com>
wrote:
> I am a bit confused as too when, if ever, it is not appropriate to prepend
> 'self' to objects in a class. All of the examples of how to use 'self' that
> I find seem to be short and very simple (as examples tent to be). I
> appologize if I am asking an ignorant question here, but I want to get off
> on the right foot. Here's an example of what I mean:
>
> import serial
> class foo:
> ? ? def __init(self, comport):
> ? ? ? ? self.comport = comport
> ? ? ? ? self.baudrate = 9600 #default
> ? ? ? ? self.ser = serial
> ? ? ? ? try:
> ? ? ? ? ? ? self.ser.Serial()
> ? ? ? ? ? ? self.ser.baudrate = self.baudrate
> ? ? ? ? ? ? self.ser.open()
> ? ? ? ? except:
> ? ? ? ? ? ? print 'Serial port could not be opened'
>
> === OR ===
> import serial
> class foo:
> ? ? def __init(self, comport):
> ? ? ? ? self.comport = comport
> ? ? ? ? self.baudrate = 9600 #default
> ? ? ? ? try:
> ? ? ? ? ? ? ser = serial.Serial()
> ? ? ? ? ? ? ser.baudrate = self.baudrate
> ? ? ? ? ? ? ser.open()
> ? ? ? ? except:
> ? ? ? ? ? ? print 'Serial port could not be opened'
>
> There may be a typo in here, this is just a random example similar to
> something I'm working with, but which one of these are more 'proper'? If I
> am importing a library do I still prepend it's object with self when I use
> it in my class? I suppose my question is just basically... when do you NOT
> prepent an object in a class with 'self'?
>
> I'm not even sure I'm using the term 'object' correctly here. Feel free to
> set me straight, but I hope my example makes it clear what I am asking.
>
> Thanks a lot, this ng has already been super helpful as I take my
> crash-course in to python! :P

Others have said something like "use self prepended to an object if
you are
going to use it again".  I'd prefer to think of it more like "use self
prepended to an object if you'd like other functions to be able to
know
about that object.".  Is say this because you can have functions
called
over and over, and their contents "used again", but you still might
not
mind if their objects are local only to that function.

I just think of it that if I am going to need this object to be
generally
available to the whole class, I throw a self. on.  If not, I might not
bother.



From rent.lupin.road at gmail.com  Thu May 14 00:11:21 2009
From: rent.lupin.road at gmail.com (James)
Date: Wed, 13 May 2009 21:11:21 -0700 (PDT)
Subject: Distributed locking
Message-ID: <7addabf4-2b20-4be2-8d1b-cde6d0a04bb1@a5g2000pre.googlegroups.com>

Hey all, I'm looking for suggestions on how to tackle distributed
locking across several Python programs on several different machines.

- the objects to be locked are uniquely identified by an integer
- I need "one at a time" semantics for the lock: zero or one read-
writer at any point
- the operations to be performed on the objects are strictly limited
in duration (no more than 10 seconds)

As the operations have a maximum duration, my ideal solution would be
to lock the objects, and have them automatically unlock after some
time period even if the original lock-holder doesn't release them.

I'm currently playing with memcached as a locking mechanism as it's
simplicity and timeout fit my requirements well.

There is a check-and-set operation which atomically writes new data
iff the existing value hasn't been changed since we last looked.
However, their CAS operation doesn't handle the case of a non-existent
key..

Does anyone have suggestions on how I can do distributed locking to
take advantage of the time limit on operations?

Many thanks,
James


From wells at submute.net  Thu May 14 00:17:45 2009
From: wells at submute.net (Wells)
Date: Wed, 13 May 2009 21:17:45 -0700 (PDT)
Subject: Assigning multiple variables to a list a la php's list()
Message-ID: <032e2bae-b5c8-4e0d-a526-fa7d058fcc69@t10g2000vbg.googlegroups.com>

Can you take a list and have it exploded into variables w/ one
command? Something like..


list = ['foo', 'bar']
[a, b] = list

Then 'a' would be foo and 'b' 'bar'.

Like list($a,$b) = $list in PHP.

Thanks!


From clp2 at rebertia.com  Thu May 14 00:24:06 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 13 May 2009 21:24:06 -0700
Subject: Assigning multiple variables to a list a la php's list()
In-Reply-To: <032e2bae-b5c8-4e0d-a526-fa7d058fcc69@t10g2000vbg.googlegroups.com>
References: <032e2bae-b5c8-4e0d-a526-fa7d058fcc69@t10g2000vbg.googlegroups.com>
Message-ID: <50697b2c0905132124u6b79e3b5i549d41a3691d61f1@mail.gmail.com>

On Wed, May 13, 2009 at 9:17 PM, Wells <wells at submute.net> wrote:
> Can you take a list and have it exploded into variables w/ one
> command? Something like..
>
>
> list = ['foo', 'bar']
> [a, b] = list
>
> Then 'a' would be foo and 'b' 'bar'.

Did you think to try it at the interpreter? That exact syntax works,
though we usually write it without the brackets, like:

a, b = list

Also, don't use "list" as a variable name since it clashes with the
builtin type.

Cheers,
Chris
-- 
http://blog.rebertia.com


From mabdelkader at gmail.com  Thu May 14 00:39:35 2009
From: mabdelkader at gmail.com (ma)
Date: Thu, 14 May 2009 00:39:35 -0400
Subject: What's the use of the else in try/except/else?
In-Reply-To: <gu9fl8$nmh$1@reader1.panix.com>
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net> 
	<gu9fl8$nmh$1@reader1.panix.com>
Message-ID: <148918f0905132139m5f07e1a0u74297159247f661@mail.gmail.com>

A really great use for try/except/else would be if an object is
implementing its own __getitem__ method, so you would have something
like this:

class SomeObj(object):
    def __getitem__(self, key):
		try:
			#sometype of assertion here based on key type
		except AssertionError, e:
			raise TypeError, e #invalid type
		else:
			#continue processing, etc.. return some index, which will auto throw
			#an index error if you have some type of indexable datastructure


From steven at REMOVE.THIS.cybersource.com.au  Thu May 14 01:03:16 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 14 May 2009 05:03:16 GMT
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net>
	<gu9fl8$nmh$1@reader1.panix.com>
	<mailman.124.1242275998.8015.python-list@python.org>
Message-ID: <pan.2009.05.14.05.03.17@REMOVE.THIS.cybersource.com.au>

On Thu, 14 May 2009 00:39:35 -0400, ma wrote:

> A really great use for try/except/else would be if an object is
> implementing its own __getitem__ method, so you would have something
> like this:
> 
> class SomeObj(object):
>     def __getitem__(self, key):
> 		try:
> 			#sometype of assertion here based on key type
> 		except AssertionError, e:
> 			raise TypeError, e #invalid type

Why raise AssertionError only to catch it and raise TypeError? Why not 
just raise TypeError in the first place?


If you're thinking of writing this:

assert isinstance(key, whatever)

you should be aware that when Python is run with the -O flag (optimize), 
all asserts are disabled, and so your error checking code will not run 
and your program will crash and burn in a horrible flaming mess.


[steve at wow-wow ~]$ python -O
Python 2.5 (r25:51908, Nov  6 2007, 16:54:01)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> assert None is 2
>>>
>>>


The assert statement is not for runtime error checking. assert is for 
checking your program logic and invariants. If you've ever written a 
comment like:

# When we get here, then x will always be greater than 3.

(or something like that), that's a great candidate for an assertion:

assert x > 3, "x is unexpectedly less than or equal to three"


For error checking, you should do something like this:

if not isinstance(key, whatever):
    raise ValueError

rather than:

try:
    if not isinstance(key, whatever):
        raise AssertionError
except AssertionError:
    raise ValueError




-- 
Steven


From david.lyon at preisshare.net  Thu May 14 01:08:12 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Thu, 14 May 2009 01:08:12 -0400
Subject: Fwd: Re: Unable to install Pywin32 for Python 2.6.2
In-Reply-To: <4A0B4AA8.2090703@gmail.com>
References: <90e1d7598b339eb4350e84024d2cf04a@preisshare.net>	<mailman.22.1242108050.8015.python-list@python.org>	<02oOl.710$wR5.489@nwrddc02.gnilink.net>	<mailman.65.1242174135.8015.python-list@python.org>	<4a0a3f40$0$24009$9b622d9e@news.freenet.de>
	<64fc05ead382d1a8490deb9a07bd5f01@preisshare.net>
	<4A0B4AA8.2090703@gmail.com>
Message-ID: <db3e4e7aa97e213db56a1ae954fc8935@preisshare.net>

On Thu, 14 May 2009 08:33:12 +1000, Mark Hammond <skippy.hammond at gmail.com>
wrote:

> But if PYTHONPATH was set incorrectly it really doesn't matter how 
> Python was installed, it would still fail.  The installer didn't set 
> PYTHONPATH, a human did.

Hi Mark,

Well I am just trying to write a package manager for python because
I felt spoiled on my last platform, perl. When I came to python I found 
a bit primitive in python under windows in comparison. I felt like
starting to write something that might be useful..

I've personally used your packages at work and find them useful. 

At the same time it is a very interesting learning process about python
and how it works..

Best Regards

David




From mabdelkader at gmail.com  Thu May 14 01:19:50 2009
From: mabdelkader at gmail.com (ma)
Date: Thu, 14 May 2009 01:19:50 -0400
Subject: What's the use of the else in try/except/else?
In-Reply-To: <pan.2009.05.14.05.03.17@REMOVE.THIS.cybersource.com.au>
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net> 
	<gu9fl8$nmh$1@reader1.panix.com>
	<mailman.124.1242275998.8015.python-list@python.org> 
	<pan.2009.05.14.05.03.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <148918f0905132219x4873e7eewd15de6ccef4333fd@mail.gmail.com>

That's great to know! Thanks for that explanation, I am refactoring
something and I was going to make ample use of assertion as I thought
it was the same as C's assertion without the NDEBUG flag.


On Thu, May 14, 2009 at 1:03 AM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
> On Thu, 14 May 2009 00:39:35 -0400, ma wrote:
>
>> A really great use for try/except/else would be if an object is
>> implementing its own __getitem__ method, so you would have something
>> like this:
>>
>> class SomeObj(object):
>> ? ? def __getitem__(self, key):
>> ? ? ? ? ? ? ? try:
>> ? ? ? ? ? ? ? ? ? ? ? #sometype of assertion here based on key type
>> ? ? ? ? ? ? ? except AssertionError, e:
>> ? ? ? ? ? ? ? ? ? ? ? raise TypeError, e #invalid type
>
> Why raise AssertionError only to catch it and raise TypeError? Why not
> just raise TypeError in the first place?
>
>
> If you're thinking of writing this:
>
> assert isinstance(key, whatever)
>
> you should be aware that when Python is run with the -O flag (optimize),
> all asserts are disabled, and so your error checking code will not run
> and your program will crash and burn in a horrible flaming mess.
>
>
> [steve at wow-wow ~]$ python -O
> Python 2.5 (r25:51908, Nov ?6 2007, 16:54:01)
> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> assert None is 2
>>>>
>>>>
>
>
> The assert statement is not for runtime error checking. assert is for
> checking your program logic and invariants. If you've ever written a
> comment like:
>
> # When we get here, then x will always be greater than 3.
>
> (or something like that), that's a great candidate for an assertion:
>
> assert x > 3, "x is unexpectedly less than or equal to three"
>
>
> For error checking, you should do something like this:
>
> if not isinstance(key, whatever):
> ? ?raise ValueError
>
> rather than:
>
> try:
> ? ?if not isinstance(key, whatever):
> ? ? ? ?raise AssertionError
> except AssertionError:
> ? ?raise ValueError
>
>
>
>
> --
> Steven
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From daved170 at gmail.com  Thu May 14 02:57:02 2009
From: daved170 at gmail.com (daved170)
Date: Wed, 13 May 2009 23:57:02 -0700 (PDT)
Subject: PythonCard - My app stuck when button clicked
References: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>
	<mailman.96.1242236574.8015.python-list@python.org>
Message-ID: <a01f1519-707d-4056-b34a-b1858c1d60e4@n4g2000vba.googlegroups.com>

On May 13, 7:42?pm, Dave Angel <da... at ieee.org> wrote:
> daved170 wrote:
> > Hi there,
> > I'm newbie in pythonCard.
> > I have an application with 2 buttons : START , STOP
> > Start execute a while(1) loop that execute my calculations.
> > Stop suppose to raise a flag that will end that loop.
>
> > Whenever I pish the START button my GUI is stuck. the calculation
> > executes but I can't push the STOP button.
>
> > I added thread that START start a thread that execute my calculations.
> > I also added a Global variable that will hold the indication if the
> > loop should continue.
> > The problem now is that the thread ignore that variable and loop
> > forever.
>
> > Is there a simple way to make sure that the GUI won't stuck (without
> > threads)?
> > And if there isn't such way I would appriciet it very much if anyone
> > could post an example of how to make my thread read that variable
> > Thanks
> > Dave
>
> I don't know PythonCard, but most GUI's are similar enough that the
> concepts will work, even though the details differ. ?I'll assume that
> PythonCard has a traditional event loop, from which all events are
> dispatched.
>
> If your loop is fairly small, then you should keep it to one thread. ?
> Debugging it will usually be much easier. ?The trick is to break the
> task into pieces (each piece might be once around what is now a loop),
> and invoke one piece each time the event loop empties. ?I can't tell you
> how to do that without seeing your loop, but it's not usually very hard.
>
> Now, there is some way of POSTing an event to the event loop. ?That puts
> the event *after* all the events that are already there, but returns
> control immediately. ?So create a custom event, and POST it from the
> START button's button-pressed event. ?That will fire off one "loop" of
> the special task, in other words, make one function call to your new
> function. ?Then at the end of the function, POST it again, unless the
> STOP button has been pressed in the meantime.
>
> An optimization for this is to use coroutines, which are usually done
> with a generator. ?It's much trickier to describe, but much easier to
> accomplish. ?Roughly, you'd take your existing loop, and put a yield
> statement in it at appropriate place(s). ?Then the custom event is
> simply a call to the .next() function of that generator.
>
> Now, threading isn't that tough either, depending on how much data is
> being shared between the thread and the main program. ?You say that
> sharing a global flag isn't working, but it should. ?So how about if you
> show us some code, and somebody'll spot the trouble. ?For example, is
> the thread defined in the same module as the App? ?Global only shares
> between a single module. ?Another reason globals might seem to fail is
> if you tried to do mutual imports between two or more modules. ?(A
> imports B, which imports A). ?Sometimes that fails in mysterious ways.
>
> Make a simple (stripped) example of what you're trying, and we'll try to
> find the problem. ?Without concrete code, we end up with ambiguities
> like the above usage of two different meanings for "the loop."- Hide quoted text -
>
> - Show quoted text -

Thank's Dave,
Here my code, It's a very simple app. the Start button starts a TCP/IP
communication and the Stop should dtop it and kill the client.
I'll be thankful if you'll be able to spot my mistake.
Thanks again
Dave

#Global Variable
bStopLoop = False

#Global Function
def execute(sockObj):
   while(!bStopLoop):
      str = sockObj.recv(1024)
      tmpStr = "Hello " + str
      sockObj.send(tmpStr)

#Thread handle class
class myThread(threading.Thread):
   def __init__(self,sockObj):
      threading.Thread.__init__(self)
      bStopLoop = False
      self.sockObj = sockObj

   def run(self):
      execute(self.SockObj)

# GUI
class GUI(model.Background)

   def on_Start_mouseclick(self,event):
   try:
      event.target.enable = False
      event.target.redraw()
      self.components.Start.enable = False
      self.currThread = myThread(self.sockObj)
      self.currThread.Start()
      wx.SafeYield(self)
      self.components.Start.enable = True
   except:
      .....

   def on_Stop_mouseclick(self,event):
      bStopLoop = True


From andreengels at gmail.com  Thu May 14 03:08:24 2009
From: andreengels at gmail.com (Andre Engels)
Date: Thu, 14 May 2009 09:08:24 +0200
Subject: What's the use of the else in try/except/else?
In-Reply-To: <148918f0905132139m5f07e1a0u74297159247f661@mail.gmail.com>
References: <gu7f97$mt6$2@reader1.panix.com>
	<w_adnY5Q3JzyxJrXnZ2dnUVZ_u2dnZ2d@pdx.net>
	<gu9fl8$nmh$1@reader1.panix.com>
	<148918f0905132139m5f07e1a0u74297159247f661@mail.gmail.com>
Message-ID: <6faf39c90905140008v6cd54b6crb23b9f23578fa05f@mail.gmail.com>

On Thu, May 14, 2009 at 6:39 AM, ma <mabdelkader at gmail.com> wrote:
> A really great use for try/except/else would be if an object is
> implementing its own __getitem__ method, so you would have something
> like this:
>
> class SomeObj(object):
> ? ?def __getitem__(self, key):
> ? ? ? ? ? ? ? ?try:
> ? ? ? ? ? ? ? ? ? ? ? ?#sometype of assertion here based on key type
> ? ? ? ? ? ? ? ?except AssertionError, e:
> ? ? ? ? ? ? ? ? ? ? ? ?raise TypeError, e #invalid type
> ? ? ? ? ? ? ? ?else:
> ? ? ? ? ? ? ? ? ? ? ? ?#continue processing, etc.. return some index, which will auto throw
> ? ? ? ? ? ? ? ? ? ? ? ?#an index error if you have some type of indexable datastructure

Again, this is a case where no else is needed. Whenever you raise
something in the except clause (as your only exit point), it would
work just as well (though it might be a bit uglier) to put the rest
after the try ... except without an else. It is when after the
exception execution continues normally, but skipping part of the code,
that you need an else.


-- 
Andr? Engels, andreengels at gmail.com


From gagsl-py2 at yahoo.com.ar  Thu May 14 03:13:01 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 14 May 2009 04:13:01 -0300
Subject: HTTP HEAD and docxmlrpcserver
References: <4d9b53db0905110023r6d92d0dcx4135603713295a02@mail.gmail.com>
Message-ID: <op.utwrnzhbx6zn5v@lepton.softlabbsas.com.ar>

En Mon, 11 May 2009 04:23:29 -0300, Christopher Mahan  
<chris.mahan at gmail.com> escribi?:

> I have a docxmlrpcserver install (kissws.com) that's returning HTTP code  
> 501
> when the client makes a HEAD request.
>
> Any idea as to whether that's by design?

Yes. The XMLRPC spec defines only the POST request; DocXMLRPCServer  
extends the definition so a GET request is interpreted as a documentation  
query. Any other method remains undefined and generates a "501 Unsupported  
method (xxx)" response.

If you do need HEAD, extend DocXMLRPCRequestHandler to define a do_HEAD  
method (same as do_GET but without actually sending the response entity).

-- 
Gabriel Genellina



From chris.mahan at gmail.com  Thu May 14 03:29:36 2009
From: chris.mahan at gmail.com (Christopher Mahan)
Date: Thu, 14 May 2009 00:29:36 -0700
Subject: HTTP HEAD and docxmlrpcserver
In-Reply-To: <op.utwrnzhbx6zn5v@lepton.softlabbsas.com.ar>
References: <4d9b53db0905110023r6d92d0dcx4135603713295a02@mail.gmail.com>
	<op.utwrnzhbx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4d9b53db0905140029je056a78lfa340a6bbfc3347b@mail.gmail.com>

On Thu, May 14, 2009 at 12:13 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Mon, 11 May 2009 04:23:29 -0300, Christopher Mahan <
> chris.mahan at gmail.com> escribi?:
>
>  I have a docxmlrpcserver install (kissws.com) that's returning HTTP code
>> 501
>> when the client makes a HEAD request.
>>
>> Any idea as to whether that's by design?
>>
>
> Yes. The XMLRPC spec defines only the POST request; DocXMLRPCServer extends
> the definition so a GET request is interpreted as a documentation query. Any
> other method remains undefined and generates a "501 Unsupported method
> (xxx)" response.
>
> If you do need HEAD, extend DocXMLRPCRequestHandler to define a do_HEAD
> method (same as do_GET but without actually sending the response entity).
>
> --
> Gabriel Genellina
>


Thank you.

Chris Mahan
chris.mahan at gmail.com
gv (818) 671-1709
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From deets at nospam.web.de  Thu May 14 03:34:23 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 14 May 2009 09:34:23 +0200
Subject: Distributed locking
In-Reply-To: <7addabf4-2b20-4be2-8d1b-cde6d0a04bb1@a5g2000pre.googlegroups.com>
References: <7addabf4-2b20-4be2-8d1b-cde6d0a04bb1@a5g2000pre.googlegroups.com>
Message-ID: <771vrvF1f4gbkU1@mid.uni-berlin.de>

James schrieb:
> Hey all, I'm looking for suggestions on how to tackle distributed
> locking across several Python programs on several different machines.
> 
> - the objects to be locked are uniquely identified by an integer
> - I need "one at a time" semantics for the lock: zero or one read-
> writer at any point
> - the operations to be performed on the objects are strictly limited
> in duration (no more than 10 seconds)
> 
> As the operations have a maximum duration, my ideal solution would be
> to lock the objects, and have them automatically unlock after some
> time period even if the original lock-holder doesn't release them.
> 
> I'm currently playing with memcached as a locking mechanism as it's
> simplicity and timeout fit my requirements well.
> 
> There is a check-and-set operation which atomically writes new data
> iff the existing value hasn't been changed since we last looked.
> However, their CAS operation doesn't handle the case of a non-existent
> key..
> 
> Does anyone have suggestions on how I can do distributed locking to
> take advantage of the time limit on operations?

I'd use a database. Maybe the time limit could be modeled with a 
transaction-timeout, but even if not, you should be able to model a 
solution with timestamps and distinct transactions to modify the locked row.

Also, for the case of the non-existing lock, go with something like this:


if not lock_exists(my_lock):
    lock_locks_table()
    if not lock_exists(my_lock):
       create_lock(my_lock)

with my_lock:
     ...


In the __enter__ and __exit__-methods of my_lock, you can perfom the 
necessary database-ops.


Diez


From mail at timgolden.me.uk  Thu May 14 03:49:28 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 14 May 2009 08:49:28 +0100
Subject: please help with python program
In-Reply-To: <950c24b6-abc4-4846-9fb6-224c04399a88@r34g2000vba.googlegroups.com>
References: <950c24b6-abc4-4846-9fb6-224c04399a88@r34g2000vba.googlegroups.com>
Message-ID: <4A0BCD08.9070500@timgolden.me.uk>

chedderslam wrote:
> IOError: [Errno 13] Permission denied: u'D:/My Music/Ani DiFranco/
> Canon/Disc 1\\folder.jpg'
> 
> I have removed the read-only attribute on the folder, and added
> "Everyone" with full control for security.  Not sure what else to do.
> I would really like to get this working so any help would be
> appreciated.

FWIW, read-only on a folder has no appreciable effect. It's generally
used by the Windows shell to indicate that the folder is "special"
(eg My Documents, My Music etc). It doesn't stop you writing files
in that directory.

Not sure how much Windows-fu you have, so apols if any of
this is teaching my grandmother to suck eggs...

I'm not familiar with the app you mention but make sure that the
user it's running under (which may be your own) has permissions
to write the file you're trying to save in the location in
question. Ie, as that user, do this in Python:

  open (u'D:/My Music/Ani DiFranco/Canon/Disc 1\\folder.jpg', "w")

to see if you get the same result. If you do, access the [Security]
tab on the folder itself, select [Advanced] and then the 
[Effective Permissions] tab to make sure what the permissions
really are. As a rule, "My xxx" folders tend to have more 
restrictive permissions as they are tied to a specific user.
This only matters, obviously, if the app is not running as
your own user.

TJG


From gagsl-py2 at yahoo.com.ar  Thu May 14 04:29:47 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 14 May 2009 05:29:47 -0300
Subject: Skipping unit tests
References: <f1mld6-v1j.ln1@satorlaser.homedns.org>
Message-ID: <op.utwu7x17x6zn5v@lepton.softlabbsas.com.ar>

En Mon, 11 May 2009 10:33:03 -0300, Ulrich Eckhardt  
<eckhardt at satorlaser.com> escribi?:

> We have a few tests for some module here. These tests are under  
> development
> and applied to older versions (with less features) of the module, too.  
> That
> means that if I have module version 42, tests A and B can not possibly
> work. I don't want to have test failures but I also don't want to fork  
> the
> test suite, so how do I get the tests to behave like Python's test suite,
> which also skips some "expected failures".

The simplest way would be to check for some condition (code version,  
attribute existence) in the tests themselves, and just skip it when it's  
not apropiate.

Another way is to omit the test case from the suite. Things can be a lot  
fancier... Look at the Python test suite for some ideas.

-- 
Gabriel Genellina



From mail at timgolden.me.uk  Thu May 14 04:40:04 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 14 May 2009 09:40:04 +0100
Subject: about Python doc reader
In-Reply-To: <OFFDBE2295.8C083EB0-ON652575B6.002E9D9C-652575B6.002ECDA9@tcs.com>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>	<4A0AC4C7.1060000@timgolden.me.uk>
	<OFFDBE2295.8C083EB0-ON652575B6.002E9D9C-652575B6.002ECDA9@tcs.com>
Message-ID: <4A0BD8E4.9070603@timgolden.me.uk>

[forwarding back to the list]
Please reply to the list: I'm not the only person
who can help, and I might not have the time even
if I can.

Shailja Gulati wrote:
> I have installed win32com but still not able to run tht code as its giving 
> error 
> 
>   File "readDocPython.py", line 1, in ?
>     import win32com.client
>   File "C:\pywin32-212\com\win32com\__init__.py", line 5, in ?
>     import win32api, sys, os
> ImportError: No module named win32api

 >
 > i have even installed win32api.dll in Sytsem folder but
 >  still can't do t.Any further help??

I don't know how you've installed it, but I really don't expect
to see it in c:\pywin32-212.... Download *and run* the
.exe installer, from here, choosing the one which corresponds
to your Python installation?

http://sourceforge.net/project/platformdownload.php?group_id=78018

Don't try to download the source -- the zip -- and add it to 
sys.path, which is the only thing I can imagine you've done there.


TJG


From grant_ito at shaw.ca  Thu May 14 04:49:39 2009
From: grant_ito at shaw.ca (Grant Ito)
Date: Thu, 14 May 2009 08:49:39 GMT
Subject: Question: Running Python programs in KDE
Message-ID: <DWQOl.45106$Jc3.20824@newsfe16.iad>

Hello.

Silly question here. I'd like to find out how to create an icon in KDE to 
run my Python scripts. Specs are as follows:

KDE version 4.1.3 in OpenSuse 11.1.
Some scripts have output to Konsole window, others use Tkinter.

Thanks in advance,
Grant.


From shailja.gulati at tcs.com  Thu May 14 04:49:58 2009
From: shailja.gulati at tcs.com (Shailja Gulati)
Date: Thu, 14 May 2009 14:19:58 +0530
Subject: about Python doc reader
Message-ID: <OF99ECE460.C56AFE3A-ON652575B6.003014AE-652575B6.00304041@tcs.com>

[forwarding back to the list]
Please reply to the list: I'm not the only person
who can help, and I might not have the time even
if I can.

Shailja Gulati wrote:
> I have installed win32com but still not able to run tht code as its 
giving 
> error 
> 
>   File "readDocPython.py", line 1, in ?
>     import win32com.client
>   File "C:\pywin32-212\com\win32com\__init__.py", line 5, in ?
>     import win32api, sys, os
> ImportError: No module named win32api

 >
 > i have even installed win32api.dll in Sytsem folder but
 >  still can't do t.Any further help??

I don't know how you've installed it, but I really don't expect
to see it in c:\pywin32-212.... Download *and run* the
.exe installer, from here, choosing the one which corresponds
to your Python installation?


Sorry about mailing u Tim.It just happened by mistake.

Reg win32api , i m still facing the same problem of Import error...Could 
anyone pls help?? m stuck

http://sourceforge.net/project/platformdownload.php?group_id=78018

Don't try to download the source -- the zip -- and add it to 
sys.path, which is the only thing I can imagine you've done there.


TJG
-- 
http://mail.python.org/mailman/listinfo/python-list

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From svarovsky.tomas at gmail.com  Thu May 14 05:00:50 2009
From: svarovsky.tomas at gmail.com (Tomas Svarovsky)
Date: Thu, 14 May 2009 02:00:50 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com>
Message-ID: <3ec026dc-f0f0-4554-844a-bf596d639d1d@e24g2000vbe.googlegroups.com>

On May 13, 4:55?pm, cgoldberg <cgoldb... at gmail.com> wrote:
> > Bascally it just grabs a page xy
> > times and tells me how long it took.
>
> you aren't doing a read(), so technically you are just connecting to
> the web server and sending the request but never reading the content
> back from the socket. ?So your timing wouldn't be accurate.
>
> try this instead:
> response = urllib2.urlopen(req).read()
>
> But that is not the problem you are describing...

Thanks for this pointer, didn't come to my mind.

> > when I increase the number of repetitions, it is
> > slowing down considerably (1 is like 3 ms, 100 takes 6 seconds).
> > Maybe it is a known issue in urllib2
>
> I ran your code and can not reproduce that behavior. ?No matter how
> many repetitions, I still get a similar response time per transaction.
>
> any more details or code samples you can provide?
>

I don;t know, I have tried the program on my local MacOs, where I have
several python runtimes installed and there is huge dfference between
result after running at 2.6 and 2.4. So this might be the problem.
When ran on the 2.6 result are comparable to php and better than ruby,
which is what I expect.

The problem is, that CentOS is running on the server and there is only
2.4 available. On wich version did you ran these tests?

Thanks

> -Corey Goldberg



From deets at nospam.web.de  Thu May 14 05:05:00 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 14 May 2009 11:05:00 +0200
Subject: Question: Running Python programs in KDE
References: <DWQOl.45106$Jc3.20824@newsfe16.iad>
Message-ID: <77252bF1eq21lU1@mid.uni-berlin.de>

Grant Ito wrote:

> Hello.
> 
> Silly question here. I'd like to find out how to create an icon in KDE to
> run my Python scripts. Specs are as follows:
> 
> KDE version 4.1.3 in OpenSuse 11.1.
> Some scripts have output to Konsole window, others use Tkinter.
> 
> Thanks in advance,
> Grant.

Try right mouseclick over the desktop. Follow the context-menu.

Diez


From mail at timgolden.me.uk  Thu May 14 05:08:23 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 14 May 2009 10:08:23 +0100
Subject: about Python doc reader
In-Reply-To: <OF99ECE460.C56AFE3A-ON652575B6.003014AE-652575B6.00304041@tcs.com>
References: <OF99ECE460.C56AFE3A-ON652575B6.003014AE-652575B6.00304041@tcs.com>
Message-ID: <4A0BDF87.9080101@timgolden.me.uk>

Shailja Gulati wrote:
> Sorry about mailing u Tim.It just happened by mistake.
> 
> Reg win32api , i m still facing the same problem of Import error...Could 
> anyone pls help?? m stuck

Shailja. Did you download and install the download .exe
from the link below?

> 
> http://sourceforge.net/project/platformdownload.php?group_id=78018


TJG


From shailja.gulati at tcs.com  Thu May 14 05:33:06 2009
From: shailja.gulati at tcs.com (Shailja Gulati)
Date: Thu, 14 May 2009 15:03:06 +0530
Subject: Fw: about Python doc reader
Message-ID: <OFAD9C1240.B2FC58CC-ON652575B6.0033EB3D-652575B6.00343315@tcs.com>

Shailja Gulati wrote:
> Sorry about mailing u Tim.It just happened by mistake.
> 
> Reg win32api , i m still facing the same problem of Import error...Could 

> anyone pls help?? m stuck

Shailja. Did you download and install the download .exe
from the link below?


yeah..I have installed it from the same link earlier..bt getting the 
Import error ...

Anyways i have got an alternate solution as

1.first convert doc to .txt file with free doc to text converter.I have 
used "Antiword"  software for this.
2. Python can easily read this txt file and process tabular data also.

so hoping tht problem will be solved.

thanks for ur help.


> 
> http://sourceforge.net/project/platformdownload.php?group_id=78018


TJG
-- 
http://mail.python.org/mailman/listinfo/python-list

ForwardSourceID:NT0000EC9E 
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confidential or privileged information. If you are 
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From svarovsky.tomas at gmail.com  Thu May 14 05:33:29 2009
From: svarovsky.tomas at gmail.com (Tomas Svarovsky)
Date: Thu, 14 May 2009 02:33:29 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com> 
	<3ec026dc-f0f0-4554-844a-bf596d639d1d@e24g2000vbe.googlegroups.com>
Message-ID: <cdb853e6-7cce-4a0d-ac45-b31a29563e8d@x6g2000vbg.googlegroups.com>

One more thing, since I am stuck with 2.4 (and if this is really 2.4
issue), is there some substitution for urllib2?

On May 14, 11:00?am, Tomas Svarovsky <svarovsky.to... at gmail.com>
wrote:
> On May 13, 4:55?pm, cgoldberg <cgoldb... at gmail.com> wrote:
>
> > > Bascally it just grabs a page xy
> > > times and tells me how long it took.
>
> > you aren't doing a read(), so technically you are just connecting to
> > the web server and sending the request but never reading the content
> > back from the socket. ?So your timing wouldn't be accurate.
>
> > try this instead:
> > response = urllib2.urlopen(req).read()
>
> > But that is not the problem you are describing...
>
> Thanks for this pointer, didn't come to my mind.
>
> > > when I increase the number of repetitions, it is
> > > slowing down considerably (1 is like 3 ms, 100 takes 6 seconds).
> > > Maybe it is a known issue in urllib2
>
> > I ran your code and can not reproduce that behavior. ?No matter how
> > many repetitions, I still get a similar response time per transaction.
>
> > any more details or code samples you can provide?
>
> I don;t know, I have tried the program on my local MacOs, where I have
> several python runtimes installed and there is huge dfference between
> result after running at 2.6 and 2.4. So this might be the problem.
> When ran on the 2.6 result are comparable to php and better than ruby,
> which is what I expect.
>
> The problem is, that CentOS is running on the server and there is only
> 2.4 available. On wich version did you ran these tests?
>
> Thanks
>
> > -Corey Goldberg



From R.Brodie at rl.ac.uk  Thu May 14 05:57:45 2009
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Thu, 14 May 2009 10:57:45 +0100
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com>
Message-ID: <gugpup$1r7$1@south.jnrs.ja.net>


"cgoldberg" <cgoldberg at gmail.com> wrote in message 
news:9ae58862-1cb2-4981-ae6a-0428c7684feb at z5g2000vba.googlegroups.com...

> you aren't doing a read(), so technically you are just connecting to
> the web server and sending the request but never reading the content
> back from the socket.
>
> But that is not the problem you are describing...

It might be, if the local server doesn't scale well enough to handle
100 concurrent requests. 




From greg.ewing at canterbury.ac.nz  Thu May 14 06:00:29 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Thu, 14 May 2009 22:00:29 +1200
Subject: 2nd Pyggy Awards Open
Message-ID: <4A0BEBBD.5070900@canterbury.ac.nz>

The Second Pyggy Awards is now open for entries.

   http://pyggy.pyweek.org/1008/

Judging will be held in the first two weeks of
August 2009.

Once again, the event is open to games from any
previous PyWeek competition.

You may also submit a game that you were intending
to enter in PyWeek 8 but didn't finish.

(It seems that some people decided not to enter their
unfinished games in PyWeek, hoping to make them Pyggy
entries instead. I'll allow that this time, but in
future it would be better to submit whatever you've
got at the end of PyWeek. You can still make a backup
PyWeek entry as well if you want.)

-- 
Greg


From svarovsky.tomas at gmail.com  Thu May 14 06:10:51 2009
From: svarovsky.tomas at gmail.com (Tomas Svarovsky)
Date: Thu, 14 May 2009 03:10:51 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com> 
	<gugpup$1r7$1@south.jnrs.ja.net>
Message-ID: <747b0d4f-f9fd-4fa6-bb6d-0a4365f328ba@b1g2000vbc.googlegroups.com>

On May 14, 11:57?am, "Richard Brodie" <R.Bro... at rl.ac.uk> wrote:
> "cgoldberg" <cgoldb... at gmail.com> wrote in message
>
> news:9ae58862-1cb2-4981-ae6a-0428c7684feb at z5g2000vba.googlegroups.com...
>
> > you aren't doing a read(), so technically you are just connecting to
> > the web server and sending the request but never reading the content
> > back from the socket.
>
> > But that is not the problem you are describing...
>
> It might be, if the local server doesn't scale well enough to handle
> 100 concurrent requests.

This is a good point, but then it would manifest regardless of the
language used AFAIK. And this is not the case, ruby and php
implementations are working quite fine.

Thanks for reply


From antroy at gmail.com  Thu May 14 07:41:27 2009
From: antroy at gmail.com (Ant)
Date: Thu, 14 May 2009 04:41:27 -0700 (PDT)
Subject: matplotlib - overlaying plots.
Message-ID: <fb29579e-4229-4d99-8ed7-201099ee8595@r36g2000vbr.googlegroups.com>

Hi All,

I am trying to get matplotlib to overlay a couple of graphs, but am
getting nowhere. I originally thought that the following may work:

>>> x = [1,2,3,4,5]
>>> y = [2,4,6,8,10]
>>> y2 = [1,4,9,16,25]

>>> plot(x, y)
>>> plot(x, y2)

Now this works as desired, however, the actual case I have is more
like this:

>>> x = [1,2,3,4,5]
>>> y = [2,4,6,8,10]
>>> y2 = [.0001, .0002, .0003, .0004, .0005]

Now the graph is useless, since the results are plotted on the same
axis. What I really want is two different sets of axes, each scaled
appropriately, but overlayed.

The data I actually have, is one set of axes plotting distance against
elevation, and a second plotting distance against speed. The former
has (y-coord) units in the range 0-2000 ft and the latter 0 - 0.01
miles/second. I want them on the same graph, so points can be easily
correlated, but overlayed so that each line has a different scale on
the y-axis. The closest I can get is to have two subplots, one above
the other.

Thanks in advance,

Ant.



From ldo at geek-central.gen.new_zealand  Thu May 14 07:42:07 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 14 May 2009 23:42:07 +1200
Subject: (Windows) Finding out which process has locked a file.
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
Message-ID: <guh02f$re4$2@lust.ihug.co.nz>

In message <787d6072-3381-40bd-
af20-8e1a40405033 at h23g2000vbc.googlegroups.com>, CinnamonDonkey wrote:

> I have a script running which occa[s]ionally fails because it is trying
> to delete a file in use by another process. When this happens I want
> it to log which process has the lock.

Maybe there is no such process. Maybe it's just the Dimdows filesystem 
randomly returning a failure on its own. How would you know?



From dikkie at nospam.org  Thu May 14 07:56:53 2009
From: dikkie at nospam.org (Dikkie Dik)
Date: Thu, 14 May 2009 13:56:53 +0200
Subject: Nimrod programming language
In-Reply-To: <57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
References: <mailman.5356.1241924167.11746.python-list@python.org>
	<7xd4ah73l3.fsf@ruckus.brouhaha.com>
	<57f4c81a-3537-49fa-a5f6-a0cc0d43d599@o14g2000vbo.googlegroups.com>
Message-ID: <4a0c0528$0$28250$bf4948fe@news.tele2.nl>


> 3) Most text files have no header specifying the encoding anyway. How
> should the programm/programmer know? And often he does not need to
> know anyway.


What? Off COURSE texts have no header stating the encoding! And it is
the programmer's responsibility to know what a text's encoding is. So do
not ignore HTTP headers when downloading or other means of communicating
the encoding.

That is the whole problem with texts represented as strings. A string is
a free sequence of bytes, whereas a text is a free sequence of
characters WITH AN ENCODING. This may be a default encoding, but you
must still know which one that is. That is your JOB as a programmer.

Putting the encoding as some sort of header in the string itself is the
worst "solution" that has ever been proposed. Do you put the only key to
a safe inside the very same safe and lock it? Then why do you have to
hack a string (is is not a text as it is not accompanied by an encoding)
to see what encoding is hidden inside?

Ask yourself: would the following "headers" ever work (each given in the
stated encoding off course)?

<meta http-equiv="Content-type" Value="text/html;charset=iso-8859-1">
<meta http-equiv="Content-type" Value="text/html;charset=utf-8">
<meta http-equiv="Content-type" Value="text/html;charset=utf-7">
<meta http-equiv="Content-type" Value="text/html;charset=utf-16">
<meta http-equiv="Content-type" Value="text/html;charset=utf-32">
<meta http-equiv="Content-type" Value="text/html;charset=ebcdic">


From flamz3d at gmail.com  Thu May 14 08:32:25 2009
From: flamz3d at gmail.com (flamz3d at gmail.com)
Date: Thu, 14 May 2009 05:32:25 -0700 (PDT)
Subject: introspection question: get return type
Message-ID: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>

Hello,
I am wondering if it's possible to get the return value of a method
*without* calling it using introspection?

something like this, suppose I want to know the type of the return
value for the method "getsomething". Is it possible to get it without
actually calling 'getsomething'?

ex:
import mystuff
print dir (mystuff.getsomething)




From davea at ieee.org  Thu May 14 08:37:19 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 14 May 2009 08:37:19 -0400
Subject: PythonCard - My app stuck when button clicked
In-Reply-To: <a01f1519-707d-4056-b34a-b1858c1d60e4@n4g2000vba.googlegroups.com>
References: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>	<mailman.96.1242236574.8015.python-list@python.org>
	<a01f1519-707d-4056-b34a-b1858c1d60e4@n4g2000vba.googlegroups.com>
Message-ID: <4A0C107F.1060302@ieee.org>

daved170 wrote:
> On May 13, 7:42 pm, Dave Angel <da... at ieee.org> wrote:
>   
>> daved170 wrote:
>>     
>>> Hi there,
>>> I'm newbie in pythonCard.
>>> I have an application with 2 buttons : START , STOP
>>> Start execute a while(1) loop that execute my calculations.
>>> Stop suppose to raise a flag that will end that loop.
>>>       
>>> Whenever I pish the START button my GUI is stuck. the calculation
>>> executes but I can't push the STOP button.
>>>       
>>> I added thread that START start a thread that execute my calculations.
>>> I also added a Global variable that will hold the indication if the
>>> loop should continue.
>>> The problem now is that the thread ignore that variable and loop
>>> forever.
>>>       
>>> Is there a simple way to make sure that the GUI won't stuck (without
>>> threads)?
>>> And if there isn't such way I would appriciet it very much if anyone
>>> could post an example of how to make my thread read that variable
>>> Thanks
>>> Dave
>>>       
>> I don't know PythonCard, but most GUI's are similar enough that the
>> concepts will work, even though the details differ.  I'll assume that
>> PythonCard has a traditional event loop, from which all events are
>> dispatched.
>>
>> If your loop is fairly small, then you should keep it to one thread.  
>> Debugging it will usually be much easier.  The trick is to break the
>> task into pieces (each piece might be once around what is now a loop),
>> and invoke one piece each time the event loop empties.  I can't tell you
>> how to do that without seeing your loop, but it's not usually very hard.
>>
>> Now, there is some way of POSTing an event to the event loop.  That puts
>> the event *after* all the events that are already there, but returns
>> control immediately.  So create a custom event, and POST it from the
>> START button's button-pressed event.  That will fire off one "loop" of
>> the special task, in other words, make one function call to your new
>> function.  Then at the end of the function, POST it again, unless the
>> STOP button has been pressed in the meantime.
>>
>> An optimization for this is to use coroutines, which are usually done
>> with a generator.  It's much trickier to describe, but much easier to
>> accomplish.  Roughly, you'd take your existing loop, and put a yield
>> statement in it at appropriate place(s).  Then the custom event is
>> simply a call to the .next() function of that generator.
>>
>> Now, threading isn't that tough either, depending on how much data is
>> being shared between the thread and the main program.  You say that
>> sharing a global flag isn't working, but it should.  So how about if you
>> show us some code, and somebody'll spot the trouble.  For example, is
>> the thread defined in the same module as the App?  Global only shares
>> between a single module.  Another reason globals might seem to fail is
>> if you tried to do mutual imports between two or more modules.  (A
>> imports B, which imports A).  Sometimes that fails in mysterious ways.
>>
>> Make a simple (stripped) example of what you're trying, and we'll try to
>> find the problem.  Without concrete code, we end up with ambiguities
>> like the above usage of two different meanings for "the loop."- Hide quoted text -
>>
>> - Show quoted text -
>>     
>
> Thank's Dave,
> Here my code, It's a very simple app. the Start button starts a TCP/IP
> communication and the Stop should dtop it and kill the client.
> I'll be thankful if you'll be able to spot my mistake.
> Thanks again
> Dave
>
> #Global Variable
> bStopLoop =alse
>
> #Global Function
> def execute(sockObj):
>    while(!bStopLoop):
>       str =ockObj.recv(1024)
>       tmpStr =Hello " + str
>       sockObj.send(tmpStr)
>
> #Thread handle class
> class myThread(threading.Thread):
>    def __init__(self,sockObj):
>       threading.Thread.__init__(self)
>       bStopLoop =alse
>       self.sockObj =ockObj
>
>    def run(self):
>       execute(self.SockObj)
>
> # GUI
> class GUI(model.Background)
>
>    def on_Start_mouseclick(self,event):
>    try:
>       event.target.enable =alse
>       event.target.redraw()
>       self.components.Start.enable =alse
>       self.currThread =yThread(self.sockObj)
>       self.currThread.Start()
>       wx.SafeYield(self)
>       self.components.Start.enable =rue
>    except:
>       .....
>
>    def on_Stop_mouseclick(self,event):
>       bStopLoop =rue
>
>   
In the two methods that try to change bStopLoop, you don't declare it 
global.  Add the line "global bStopLoop"  to beginning of both 

on_Start_mouseclick() and on_Stop_mouseclick(), and (my preference) to function execute()

The semantics of global versus local variables for non-nested functions/methods is roughly:   if a function or method assigns to a name, it's taken to be a local, unless it's explicitly declared as global. 




From deets at nospam.web.de  Thu May 14 08:39:07 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 14 May 2009 14:39:07 +0200
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
Message-ID: <772hjpF1f0d2dU1@mid.uni-berlin.de>

flamz3d at gmail.com wrote:

> Hello,
> I am wondering if it's possible to get the return value of a method
> *without* calling it using introspection?

Nope. All that's possible to see if there is a implicit or explicit return
through dis.disassemble - if you find "LOAD_CONST None" before any
return-statement, you know that you don't anything else.

Diez


From bearophileHUGS at lycos.com  Thu May 14 09:02:05 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 14 May 2009 06:02:05 -0700 (PDT)
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
Message-ID: <c36aa147-d153-4583-86fb-ea141efcc39f@o14g2000vbo.googlegroups.com>

flam... at gmail.com:
> I am wondering if it's possible to get the return value of a method
> *without* calling it using introspection?

Python is dynamically typed, so you can create a function like this:

>>> foo = lambda x: "x" if x else 1
>>> foo(1)
'x'
>>> foo(0)
1

The return type of foo() changes according to the input value.
In general there's not much hope to know the return type if you don't
actually run the function.

Bye,
bearophile


From zhenhai.zhang at gmail.com  Thu May 14 09:05:38 2009
From: zhenhai.zhang at gmail.com (Zhenhai Zhang)
Date: Thu, 14 May 2009 09:05:38 -0400
Subject: python copy method alters type
Message-ID: <4A0C1722.4050600@gmail.com>

Really weired; Here is my code:

    a = ["a", 1, 3, 4]
    print "a:", a
   
    c = copy(a)
    c[0] = "c"
    c[1] = 2
    print "c:", c
    print "a:",a

output as follows:

a: ['a', 1, 3, 4]
c: ['c' '2' '3' '4']
a: ['a', 1, 3, 4]

Btw, I'm using python 2.5. I'm very curious why the copied list changed 
data type.

Thanks,

Zhenhai


From deets at nospam.web.de  Thu May 14 09:07:24 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 14 May 2009 15:07:24 +0200
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<772hjpF1f0d2dU1@mid.uni-berlin.de>
Message-ID: <772j8qF1fcq5dU1@mid.uni-berlin.de>

Diez B. Roggisch wrote:

> flamz3d at gmail.com wrote:
> 
>> Hello,
>> I am wondering if it's possible to get the return value of a method
>> *without* calling it using introspection?
> 
> Nope. All that's possible to see if there is a implicit or explicit return
> through dis.disassemble - if you find "LOAD_CONST None" before any
> return-statement, you know that you don't anything else.

Gosh, this is barely intelligible...

What I wanted to say is that you can check if a function only returns
constant values, which most of the time will be implicit "return None"
statements, as in this:

def foo():
    a = 10

dis.disassemble(foo.func_code)
...
  2           0 LOAD_CONST               0 (None)
              3 RETURN_VALUE
Diez


From deets at nospam.web.de  Thu May 14 09:10:12 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 14 May 2009 15:10:12 +0200
Subject: python copy method alters type
References: <mailman.137.1242306343.8015.python-list@python.org>
Message-ID: <772je3F1fcq5dU2@mid.uni-berlin.de>

Zhenhai Zhang wrote:

> Really weired; Here is my code:
> 
>     a = ["a", 1, 3, 4]
>     print "a:", a
>    
>     c = copy(a)
>     c[0] = "c"
>     c[1] = 2
>     print "c:", c
>     print "a:",a
> 
> output as follows:
> 
> a: ['a', 1, 3, 4]
> c: ['c' '2' '3' '4']
> a: ['a', 1, 3, 4]
> 
> Btw, I'm using python 2.5. I'm very curious why the copied list changed
> data type.

It doesn't. This must be some effect of you toying around and forgetting
some steps.

>>> import copy
>>> print "a:", a
a: ['a', 1, 3, 4]
>>> c = copy.copy(a)
>>> c[0] = "c"
>>> c[1] = 2
>>> print "c:", c
c: ['c', 2, 3, 4]


Diez


From wynand.winterbach at gmail.com  Thu May 14 09:12:13 2009
From: wynand.winterbach at gmail.com (Wynand Winterbach)
Date: Thu, 14 May 2009 15:12:13 +0200
Subject: python copy method alters type
In-Reply-To: <4A0C1722.4050600@gmail.com>
References: <4A0C1722.4050600@gmail.com>
Message-ID: <1242306733.27293.1.camel@wynand-desktop>

My only guess is that the code below is not using the copy function from
the copy module, but that some other function is aliasing the copy
function.

I've tried this code with both Python 2.5 and 2.6 and get the correct
behaviour.

Best
Wynand

Op donderdag 14-05-2009 om 09:05 uur [tijdzone -0400], schreef Zhenhai
Zhang:
> Really weired; Here is my code:
> 
>     a = ["a", 1, 3, 4]
>     print "a:", a
>    
>     c = copy(a)
>     c[0] = "c"
>     c[1] = 2
>     print "c:", c
>     print "a:",a
> 
> output as follows:
> 
> a: ['a', 1, 3, 4]
> c: ['c' '2' '3' '4']
> a: ['a', 1, 3, 4]
> 
> Btw, I'm using python 2.5. I'm very curious why the copied list changed 
> data type.
> 
> Thanks,
> 
> Zhenhai



From bruno.42.desthuilliers at websiteburo.invalid  Thu May 14 09:12:30 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 14 May 2009 15:12:30 +0200
Subject: python copy method alters type
In-Reply-To: <mailman.137.1242306343.8015.python-list@python.org>
References: <mailman.137.1242306343.8015.python-list@python.org>
Message-ID: <4a0c18b7$0$5463$426a74cc@news.free.fr>

Zhenhai Zhang a ?crit :
> Really weired; Here is my code:
> 
>    a = ["a", 1, 3, 4]
>    print "a:", a
>      c = copy(a)
>    c[0] = "c"
>    c[1] = 2
>    print "c:", c
>    print "a:",a
> 
> output as follows:
> 
> a: ['a', 1, 3, 4]
> c: ['c' '2' '3' '4']
> a: ['a', 1, 3, 4]
>
> Btw, I'm using python 2.5. I'm very curious why the copied list changed 
> data type.

I think you're not using the stdlib's copy.copy function...

Python 2.5.2 (r252:60911, Oct  5 2008, 19:24:49)
GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from copy import copy
>>> a = ["a", 1, 3, 4]
>>> print a
['a', 1, 3, 4]
>>> c = copy(a)
>>> c
['a', 1, 3, 4]
>>> c[0] = "c"
>>> c[1] = 2
>>> c
['c', 2, 3, 4]
>>> a
['a', 1, 3, 4]
>>> 



From bruno.42.desthuilliers at websiteburo.invalid  Thu May 14 09:18:13 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 14 May 2009 15:18:13 +0200
Subject: introspection question: get return type
In-Reply-To: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
Message-ID: <4a0c1a0e$0$31748$426a74cc@news.free.fr>

flamz3d at gmail.com a ?crit :
> Hello,
> I am wondering if it's possible to get the return value of a method
> *without* calling it

Getting the return *value* without calling the function ? heck, that 
would be really helpful - we'd save quiet a lot on function call 
overhead and function execution time !-)

> using introspection?
> 
> something like this, suppose I want to know the type of the return
> value for the method "getsomething". Is it possible to get it without
> actually calling 'getsomething'?

Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
sense given Python's dynamic typing.





From ndbecker2 at gmail.com  Thu May 14 09:20:12 2009
From: ndbecker2 at gmail.com (Neal Becker)
Date: Thu, 14 May 2009 09:20:12 -0400
Subject: itertools question
Message-ID: <guh5qc$lsc$1@ger.gmane.org>

Is there any canned iterator adaptor that will 

transform:
in = [1,2,3....]

into:
out = [(1,2,3,4), (5,6,7,8),...]

That is, each time next() is called, a tuple of the next N items is 
returned.




From python.list at tim.thechases.com  Thu May 14 09:20:46 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 14 May 2009 08:20:46 -0500
Subject: python copy method alters type
In-Reply-To: <4A0C1722.4050600@gmail.com>
References: <4A0C1722.4050600@gmail.com>
Message-ID: <4A0C1AAE.6020908@tim.thechases.com>

Zhenhai Zhang wrote:
> Really weired; Here is my code:
> 
>     a = ["a", 1, 3, 4]
>     print "a:", a
>    
>     c = copy(a)

Where do you get this copy() function?

   tim at rubbish:~$ python2.5
   Python 2.5.4 (r254:67916, Feb 17 2009, 20:16:45)
   >>> help(copy)
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
   NameError: name 'copy' is not defined

There is no "copy" in the python default namespace.  So you must 
have gotten it somewhere.  However, if you got it from the stdlib:

   >>> from copy import copy

   >>> a = ["a", 1,2,3]
   >>> b = copy(a)
   >>> b[0] = "b"
   >>> b[1] = 42
   >>> print b
   ['b', 42, 2, 3]

it would work as evidenced here.  Thus your code shows this is 
some custom copy() function which you didn't include in your 
message.  Therein lies your problem.

For shallow-copying lists, you'll usually find it written as

   b = a[:]

The "copy" module is more useful for complex data-structures and 
deep-copies.

-tkc





From bearophileHUGS at lycos.com  Thu May 14 09:29:13 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 14 May 2009 06:29:13 -0700 (PDT)
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.29.1242119171.8015.python-list@python.org> 
	<043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>
Message-ID: <83b176cc-dce5-4fb8-a4bb-b9151f59ee9c@z7g2000vbh.googlegroups.com>

rump... at web.de:
> Eventually the "rope" data structure (that the compiler uses heavily)
> will become a proper part of the library:

Ropes are a complex data structure, that it has some downsides too.
Python tries to keep its implementation too simple, this avoids lot of
troubles (and is one of the not much visible design ideas that have
determined the success of Python).

--------

I've seen that in Nimrod the following names are the same one:
justaname JustAName just_a_name just__aname Justaname

So like Pascal (and unlike Python/C) it doesn't tell apart names just
on the base of their case (this is positive for newbie programmers,
they usually use the convention of natural written language where
'Hello' and 'hello' are the same word, they need some time to learn
the case-sensitivity).

Nimrod also seems to ignore underscores inside names, seeing them as
blanks. Some languages ignore underscores inside number literals, but
I have never seen a language ignoring them into names too.

In a class if you have a method like:
change_table_color
Isn't much good to also have a method named:
changeTableColor
Good programming practice tells you to avoid names that can be
confused (as 'chop' and 'chomp' in the string functions of D Phobos
lib). To avoid that most languages adopt a convention, so for example
in Python the change_table_color is the only used name, Java uses
changeTableColor, etc. Such conventions solve most of such problems.

So I don't know how much I like this design detail of Nimrod.

In Python you often see code like:
node = Node()

Sometimes in a case-sensitive language I'd like to have a compilation
warning switch that tells me that in a namespace there are two or more
names that differ only on character case or underscore count. This may
help avoid some bugs. A language may even enforce this as a syntax
error, so you have to write things like:
n = Node()
Or:
anode = Node()

Bye,
bearophile


From bearophileHUGS at lycos.com  Thu May 14 09:33:34 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 14 May 2009 06:33:34 -0700 (PDT)
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<c36aa147-d153-4583-86fb-ea141efcc39f@o14g2000vbo.googlegroups.com>
Message-ID: <5d98b702-2c14-4597-92a2-9947b62c91fa@v17g2000vbb.googlegroups.com>

On the other hand, generally good programming practice suggests you to
write functions that have a constant return type. And in most programs
most functions are like this. This is why ShedSkin can indeed infer
the return type of functions in "good behaved" programs. To do this
ShedSkin uses a quite refined (and slow if written in Python) type
inference algorithm.

Bye,
bearophile


From glauco.uri at prometeia.it  Thu May 14 09:35:32 2009
From: glauco.uri at prometeia.it (Glauco)
Date: Thu, 14 May 2009 15:35:32 +0200
Subject: itertools question
In-Reply-To: <mailman.139.1242307225.8015.python-list@python.org>
References: <mailman.139.1242307225.8015.python-list@python.org>
Message-ID: <4A0C1E24.1050004@prometeia.it>

Neal Becker ha scritto:
> Is there any canned iterator adaptor that will 
> 
> transform:
> in = [1,2,3....]
> 
> into:
> out = [(1,2,3,4), (5,6,7,8),...]
> 
> That is, each time next() is called, a tuple of the next N items is 
> returned.
> 
> 

http://stackoverflow.com/questions/312443/how-do-you-split-a-list-into-evenly-sized-chunks-in-python



Gla



From cgoldberg at gmail.com  Thu May 14 10:27:15 2009
From: cgoldberg at gmail.com (cgoldberg)
Date: Thu, 14 May 2009 07:27:15 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com> 
	<3ec026dc-f0f0-4554-844a-bf596d639d1d@e24g2000vbe.googlegroups.com>
Message-ID: <f0ba4b83-4a26-4486-b06e-1578730fd55f@p4g2000vba.googlegroups.com>

> The problem is, that CentOS is running on the server and there is only
> 2.4 available. On wich version did you ran these tests?

I tested with Windows XP and Python 2.5.4.  I don't have a 2.4 setup I
can easily test with.

you can try httplib rather than urllib2.  httplib is slightly lower
level and is actually used inside urllib2 for transport.

-Corey


From cgoldberg at gmail.com  Thu May 14 10:28:50 2009
From: cgoldberg at gmail.com (cgoldberg)
Date: Thu, 14 May 2009 07:28:50 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com> 
	<gugpup$1r7$1@south.jnrs.ja.net>
Message-ID: <30f3869b-3210-4887-8fad-9fdf45db3124@r36g2000vbr.googlegroups.com>

> It might be, if the local server doesn't scale well enough to handle
> 100 concurrent requests.

true.. I didn't think of that.  I was assuming the client machine
wasn't resource constrained.  That would definitely lead to inaccurate
timings if that was the case.






From google at mrabarnett.plus.com  Thu May 14 10:29:04 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 15:29:04 +0100
Subject: PythonCard - My app stuck when button clicked
In-Reply-To: <a01f1519-707d-4056-b34a-b1858c1d60e4@n4g2000vba.googlegroups.com>
References: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>	<mailman.96.1242236574.8015.python-list@python.org>
	<a01f1519-707d-4056-b34a-b1858c1d60e4@n4g2000vba.googlegroups.com>
Message-ID: <4A0C2AB0.1000503@mrabarnett.plus.com>

daved170 wrote:
> On May 13, 7:42 pm, Dave Angel <da... at ieee.org> wrote:
>> daved170 wrote:
>>> Hi there,
>>> I'm newbie in pythonCard.
>>> I have an application with 2 buttons : START , STOP
>>> Start execute a while(1) loop that execute my calculations.
>>> Stop suppose to raise a flag that will end that loop.
>>> Whenever I pish the START button my GUI is stuck. the calculation
>>> executes but I can't push the STOP button.
>>> I added thread that START start a thread that execute my calculations.
>>> I also added a Global variable that will hold the indication if the
>>> loop should continue.
>>> The problem now is that the thread ignore that variable and loop
>>> forever.
>>> Is there a simple way to make sure that the GUI won't stuck (without
>>> threads)?
>>> And if there isn't such way I would appriciet it very much if anyone
>>> could post an example of how to make my thread read that variable
>>> Thanks
>>> Dave
>> I don't know PythonCard, but most GUI's are similar enough that the
>> concepts will work, even though the details differ.  I'll assume that
>> PythonCard has a traditional event loop, from which all events are
>> dispatched.
>>
>> If your loop is fairly small, then you should keep it to one thread.  
>> Debugging it will usually be much easier.  The trick is to break the
>> task into pieces (each piece might be once around what is now a loop),
>> and invoke one piece each time the event loop empties.  I can't tell you
>> how to do that without seeing your loop, but it's not usually very hard.
>>
>> Now, there is some way of POSTing an event to the event loop.  That puts
>> the event *after* all the events that are already there, but returns
>> control immediately.  So create a custom event, and POST it from the
>> START button's button-pressed event.  That will fire off one "loop" of
>> the special task, in other words, make one function call to your new
>> function.  Then at the end of the function, POST it again, unless the
>> STOP button has been pressed in the meantime.
>>
>> An optimization for this is to use coroutines, which are usually done
>> with a generator.  It's much trickier to describe, but much easier to
>> accomplish.  Roughly, you'd take your existing loop, and put a yield
>> statement in it at appropriate place(s).  Then the custom event is
>> simply a call to the .next() function of that generator.
>>
>> Now, threading isn't that tough either, depending on how much data is
>> being shared between the thread and the main program.  You say that
>> sharing a global flag isn't working, but it should.  So how about if you
>> show us some code, and somebody'll spot the trouble.  For example, is
>> the thread defined in the same module as the App?  Global only shares
>> between a single module.  Another reason globals might seem to fail is
>> if you tried to do mutual imports between two or more modules.  (A
>> imports B, which imports A).  Sometimes that fails in mysterious ways.
>>
>> Make a simple (stripped) example of what you're trying, and we'll try to
>> find the problem.  Without concrete code, we end up with ambiguities
>> like the above usage of two different meanings for "the loop."- Hide quoted text -
>>
>> - Show quoted text -
> 
> Thank's Dave,
> Here my code, It's a very simple app. the Start button starts a TCP/IP
> communication and the Stop should dtop it and kill the client.
> I'll be thankful if you'll be able to spot my mistake.
> Thanks again
> Dave
> 
> #Global Variable
> bStopLoop = False
> 
> #Global Function
> def execute(sockObj):
>    while(!bStopLoop):

That should be:

    while not bStopLoop:

>       str = sockObj.recv(1024)
>       tmpStr = "Hello " + str
>       sockObj.send(tmpStr)
> 
> #Thread handle class
> class myThread(threading.Thread):
>    def __init__(self,sockObj):
>       threading.Thread.__init__(self)
>       bStopLoop = False

'bStopLoop' is local to __init__. Add:

       global bStopLoop

>       self.sockObj = sockObj
> 
>    def run(self):
>       execute(self.SockObj)
> 
> # GUI
> class GUI(model.Background)
> 
>    def on_Start_mouseclick(self,event):
>    try:
>       event.target.enable = False
>       event.target.redraw()
>       self.components.Start.enable = False
>       self.currThread = myThread(self.sockObj)
>       self.currThread.Start()
>       wx.SafeYield(self)
>       self.components.Start.enable = True
>    except:
>       .....
> 
>    def on_Stop_mouseclick(self,event):
>       bStopLoop = True

'bStopLoop' is local to on_Stop_mouseclick. Add:

       global bStopLoop



From nick at craig-wood.com  Thu May 14 10:30:02 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Thu, 14 May 2009 09:30:02 -0500
Subject: itertools question
References: <mailman.139.1242307225.8015.python-list@python.org>
Message-ID: <slrnh0o97s.kc3.nick@irishsea.home.craig-wood.com>

Neal Becker <ndbecker2 at gmail.com> wrote:
>  Is there any canned iterator adaptor that will 
> 
>  transform:
>  in = [1,2,3....]
> 
>  into:
>  out = [(1,2,3,4), (5,6,7,8),...]
> 
>  That is, each time next() is called, a tuple of the next N items is 
>  returned.

This is my best effort... not using itertools as my brain doesn't seem
to work that way!

class Grouper(object):
    def __init__(self, n, i):
        self.n = n
        self.i = iter(i)
    def __iter__(self):
        while True:
            out = tuple(self.i.next() for _ in xrange(self.n))
            if not out:
                break
            yield out

g = Grouper(5, xrange(20))
print list(g)

g = Grouper(4, xrange(19))
print list(g)

Which produces

[(0, 1, 2, 3, 4), (5, 6, 7, 8, 9), (10, 11, 12, 13, 14), (15, 16, 17, 18, 19)]
[(0, 1, 2, 3), (4, 5, 6, 7), (8, 9, 10, 11), (12, 13, 14, 15), (16, 17, 18)]


-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From google at mrabarnett.plus.com  Thu May 14 10:36:43 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 15:36:43 +0100
Subject: Nimrod programming language
In-Reply-To: <83b176cc-dce5-4fb8-a4bb-b9151f59ee9c@z7g2000vbh.googlegroups.com>
References: <159308160@web.de>	<mailman.29.1242119171.8015.python-list@python.org>
	<043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>
	<83b176cc-dce5-4fb8-a4bb-b9151f59ee9c@z7g2000vbh.googlegroups.com>
Message-ID: <4A0C2C7B.5010708@mrabarnett.plus.com>

bearophileHUGS at lycos.com wrote:
> rump... at web.de:
>> Eventually the "rope" data structure (that the compiler uses heavily)
>> will become a proper part of the library:
> 
> Ropes are a complex data structure, that it has some downsides too.
> Python tries to keep its implementation too simple, this avoids lot of
> troubles (and is one of the not much visible design ideas that have
> determined the success of Python).
> 
> --------
> 
> I've seen that in Nimrod the following names are the same one:
> justaname JustAName just_a_name just__aname Justaname
> 
> So like Pascal (and unlike Python/C) it doesn't tell apart names just
> on the base of their case (this is positive for newbie programmers,
> they usually use the convention of natural written language where
> 'Hello' and 'hello' are the same word, they need some time to learn
> the case-sensitivity).
> 
> Nimrod also seems to ignore underscores inside names, seeing them as
> blanks. Some languages ignore underscores inside number literals, but
> I have never seen a language ignoring them into names too.
> 
> In a class if you have a method like:
> change_table_color
> Isn't much good to also have a method named:
> changeTableColor
> Good programming practice tells you to avoid names that can be
> confused (as 'chop' and 'chomp' in the string functions of D Phobos
> lib). To avoid that most languages adopt a convention, so for example
> in Python the change_table_color is the only used name, Java uses
> changeTableColor, etc. Such conventions solve most of such problems.
> 
> So I don't know how much I like this design detail of Nimrod.
> 
> In Python you often see code like:
> node = Node()
> 
> Sometimes in a case-sensitive language I'd like to have a compilation
> warning switch that tells me that in a namespace there are two or more
> names that differ only on character case or underscore count. This may
> help avoid some bugs. A language may even enforce this as a syntax
> error, so you have to write things like:
> n = Node()
> Or:
> anode = Node()
> 
Does Nimrod accept non-ASCII names? If so, is "I" the same character as
"i"? In most languages using the Latin alphabet they would be, but in 
Turkish they wouldn't.


From __peter__ at web.de  Thu May 14 10:40:33 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 14 May 2009 16:40:33 +0200
Subject: itertools question
References: <mailman.139.1242307225.8015.python-list@python.org>
Message-ID: <guhagq$r5m$00$1@news.t-online.com>

Neal Becker wrote:

> Is there any canned iterator adaptor that will
> 
> transform:
> in = [1,2,3....]
> 
> into:
> out = [(1,2,3,4), (5,6,7,8),...]
> 
> That is, each time next() is called, a tuple of the next N items is
> returned.

Depending on what you want to do with items that don't make a complete N-
tuple:

>>> from itertools import *
>>> items = range(10)

>>> list(izip(*(iter(items),)*3))
[(0, 1, 2), (3, 4, 5), (6, 7, 8)]

>>> list(izip_longest(*(iter(items),)*3))
[(0, 1, 2), (3, 4, 5), (6, 7, 8), (9, None, None)]

>>> list(takewhile(bool, imap(tuple, starmap(islice, repeat((iter(items), 
3))))))
[(0, 1, 2), (3, 4, 5), (6, 7, 8), (9,)]

Peter



From gdamjan at gmail.com  Thu May 14 10:51:57 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Thu, 14 May 2009 16:51:57 +0200
Subject: how to consume .NET webservice
References: <4a0885e2$0$2853$ba620e4c@news.skynet.be>
	<gua1j0$tra$1@adenine.netfront.net>
	<76rnq5F1dp6gpU1@mid.uni-berlin.de>
	<guaf4j$1fsn$1@adenine.netfront.net>
	<76slqnF1ehacbU1@mid.uni-berlin.de>
	<bb084afa-4a8a-4bf6-8786-35c6531d4ff8@j12g2000vbl.googlegroups.com>
	<e857b604-12b5-4b44-a42d-11a65ceecb50@q14g2000vbn.googlegroups.com>
Message-ID: <dpntd6-sf3.ln1@archaeopteryx.softver.org.mk>

>> OpenOfficeXML document format AKA ODF? ;)
> 
> No...Office Open XML, which is used in Microsoft Office 2007 and which
> Microsoft rammed through the ISO:
> http://en.wikipedia.org/wiki/Office_Open_XML

Even worse, Microsoft Office 2007 doesn't even implement the ISO 
standard for Open XML.

-- 
?????? ( http://softver.org.mk/damjan/ )

Our national drug is alcohol,
we tend to regard the use any other drug with special horror.
    -- William S. Burroughs




From hyugaricdeau at gmail.com  Thu May 14 10:52:29 2009
From: hyugaricdeau at gmail.com (Hyuga)
Date: Thu, 14 May 2009 07:52:29 -0700 (PDT)
Subject: matplotlib - overlaying plots.
References: <fb29579e-4229-4d99-8ed7-201099ee8595@r36g2000vbr.googlegroups.com>
Message-ID: <1223e547-6e41-4601-a3fd-f252ef2ee4e1@m24g2000vbp.googlegroups.com>

On May 14, 7:41?am, Ant <ant... at gmail.com> wrote:
> Hi All,
>
> I am trying to get matplotlib to overlay a couple of graphs, but am
> getting nowhere. I originally thought that the following may work:
>
> >>> x = [1,2,3,4,5]
> >>> y = [2,4,6,8,10]
> >>> y2 = [1,4,9,16,25]
> >>> plot(x, y)
> >>> plot(x, y2)
>
> Now this works as desired, however, the actual case I have is more
> like this:
>
> >>> x = [1,2,3,4,5]
> >>> y = [2,4,6,8,10]
> >>> y2 = [.0001, .0002, .0003, .0004, .0005]
>
> Now the graph is useless, since the results are plotted on the same
> axis. What I really want is two different sets of axes, each scaled
> appropriately, but overlayed.
>
> The data I actually have, is one set of axes plotting distance against
> elevation, and a second plotting distance against speed. The former
> has (y-coord) units in the range 0-2000 ft and the latter 0 - 0.01
> miles/second. I want them on the same graph, so points can be easily
> correlated, but overlayed so that each line has a different scale on
> the y-axis. The closest I can get is to have two subplots, one above
> the other.
>
> Thanks in advance,
>
> Ant.

Just scale up the y-axis values of your second graph 200,000 times,
and specify in label that the y-axis for the second graph is velocity
scaled up 200000x for comparison purposes.  Nothing wrong with that--
it's done all the time.

On the other hand, I just took a peek at the matplotlib example
gallery, which is very diverse, and it has an example that I think is
exactly what you're looking for: http://matplotlib.sourceforge.net/examples/api/two_scales.html


From mail at timgolden.me.uk  Thu May 14 10:57:38 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 14 May 2009 15:57:38 +0100
Subject: about Python doc reader
In-Reply-To: <4A0B403F.2090806@hughes.net>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>	<4A0AC4C7.1060000@timgolden.me.uk>
	<4A0B350A.7040006@hughes.net> <4A0B403F.2090806@hughes.net>
Message-ID: <4A0C3162.4070508@timgolden.me.uk>

norseman wrote:
> I did try these.
> 
> Doc at once:
> outputs two x'0D' and the file.  Then it appends x'0D' x'0D' x'0A' x'0D' 
> x'0A' to end of file even though source file itself has no EOL.
> ( EOL is EndOfLine  aka newline )
> 
> That's  cr cr             There are two blank lines at begining.
>         cr cr lf cr lf    There is no EOL in source
>                           Any idea what those are about?
> One crlf is probably from python's print text, but the other?
> 
> The lines=
> appends   [u'\r', u'\r', u"  to begining of output
> and   \r"]x'0D'x'0A'   to the end even though there is no EOL in source.
> 
> output is understood:    u'\r'  is Apple EOL
> the crlf is probably from print lines.

Not clear what you're doing to get there. This is the (wrapped) 
output from my interpreter, using Word 2003. As you can see, new
doc: one "\r", nothing more.

<dump>
Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 
bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more 
information.
 >>> import win32com.client
 >>> word = win32com.client.gencache.EnsureDispatch 
("Word.Application")
 >>> doc = word.Documents.Add ()
 >>> print repr (doc.Range ().Text)
u'\r'
 >>>

</dump>



From david.lyon at preisshare.net  Thu May 14 10:59:30 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Thu, 14 May 2009 10:59:30 -0400
Subject: (Windows) Finding out which process has locked a file.
In-Reply-To: <guh02f$re4$2@lust.ihug.co.nz>
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
	<guh02f$re4$2@lust.ihug.co.nz>
Message-ID: <8f2c1f99fb621acd11c5a2b63214ab3d@preisshare.net>


> In message <787d6072-3381-40bd-
> af20-8e1a40405033 at h23g2000vbc.googlegroups.com>, CinnamonDonkey wrote:
> 
>> I have a script running which occa[s]ionally fails because it is trying
>> to delete a file in use by another process. When this happens I want
>> it to log which process has the lock.

Maybe there is something on sysinternals.com that you can download....


From cbc at unc.edu  Thu May 14 11:02:46 2009
From: cbc at unc.edu (Chris Calloway)
Date: Thu, 14 May 2009 11:02:46 -0400
Subject: Toronto PyCamp 2009
Message-ID: <4A0C3296.9010303@unc.edu>

For beginners, this ultra-low-cost Python Boot Camp developed by the 
Triangle Zope and Python Users Group makes you productive so you can get 
your work done quickly. PyCamp emphasizes the features which make Python 
a simpler and more efficient language. Following along by example speeds 
your learning process in a modern high-tech classroom. Become a 
self-sufficient Python developer in just five days at PyCamp!

The University or Toronto Department of Physics brings PyCamp to 
Toronto, July 13-17, 2009.

Register today at http://trizpug.org/boot-camp/pycamp-toronto-2009/

-- 
Sincerely,

Chris Calloway
http://www.secoora.org
office: 332 Chapman Hall   phone: (919) 599-3530
mail: Campus Box #3300, UNC-CH, Chapel Hill, NC 27599





From daved170 at gmail.com  Thu May 14 11:08:51 2009
From: daved170 at gmail.com (daved170)
Date: Thu, 14 May 2009 08:08:51 -0700 (PDT)
Subject: PythonCard - My app stuck when button clicked
References: <e7a3e095-974f-4239-8812-44f304f5fb37@n21g2000vba.googlegroups.com>
	<mailman.96.1242236574.8015.python-list@python.org>
	<a01f1519-707d-4056-b34a-b1858c1d60e4@n4g2000vba.googlegroups.com>
	<mailman.136.1242304959.8015.python-list@python.org>
Message-ID: <6fb29d5f-19f2-45f0-a171-ceea2bd87f61@e24g2000vbe.googlegroups.com>

On May 14, 2:37?pm, Dave Angel <da... at ieee.org> wrote:
> daved170 wrote:
> > On May 13, 7:42 pm, Dave Angel <da... at ieee.org> wrote:
>
> >> daved170 wrote:
>
> >>> Hi there,
> >>> I'm newbie in pythonCard.
> >>> I have an application with 2 buttons : START , STOP
> >>> Start execute a while(1) loop that execute my calculations.
> >>> Stop suppose to raise a flag that will end that loop.
>
> >>> Whenever I pish the START button my GUI is stuck. the calculation
> >>> executes but I can't push the STOP button.
>
> >>> I added thread that START start a thread that execute my calculations.
> >>> I also added a Global variable that will hold the indication if the
> >>> loop should continue.
> >>> The problem now is that the thread ignore that variable and loop
> >>> forever.
>
> >>> Is there a simple way to make sure that the GUI won't stuck (without
> >>> threads)?
> >>> And if there isn't such way I would appriciet it very much if anyone
> >>> could post an example of how to make my thread read that variable
> >>> Thanks
> >>> Dave
>
> >> I don't know PythonCard, but most GUI's are similar enough that the
> >> concepts will work, even though the details differ. ?I'll assume that
> >> PythonCard has a traditional event loop, from which all events are
> >> dispatched.
>
> >> If your loop is fairly small, then you should keep it to one thread. ?
> >> Debugging it will usually be much easier. ?The trick is to break the
> >> task into pieces (each piece might be once around what is now a loop),
> >> and invoke one piece each time the event loop empties. ?I can't tell you
> >> how to do that without seeing your loop, but it's not usually very hard.
>
> >> Now, there is some way of POSTing an event to the event loop. ?That puts
> >> the event *after* all the events that are already there, but returns
> >> control immediately. ?So create a custom event, and POST it from the
> >> START button's button-pressed event. ?That will fire off one "loop" of
> >> the special task, in other words, make one function call to your new
> >> function. ?Then at the end of the function, POST it again, unless the
> >> STOP button has been pressed in the meantime.
>
> >> An optimization for this is to use coroutines, which are usually done
> >> with a generator. ?It's much trickier to describe, but much easier to
> >> accomplish. ?Roughly, you'd take your existing loop, and put a yield
> >> statement in it at appropriate place(s). ?Then the custom event is
> >> simply a call to the .next() function of that generator.
>
> >> Now, threading isn't that tough either, depending on how much data is
> >> being shared between the thread and the main program. ?You say that
> >> sharing a global flag isn't working, but it should. ?So how about if you
> >> show us some code, and somebody'll spot the trouble. ?For example, is
> >> the thread defined in the same module as the App? ?Global only shares
> >> between a single module. ?Another reason globals might seem to fail is
> >> if you tried to do mutual imports between two or more modules. ?(A
> >> imports B, which imports A). ?Sometimes that fails in mysterious ways.
>
> >> Make a simple (stripped) example of what you're trying, and we'll try to
> >> find the problem. ?Without concrete code, we end up with ambiguities
> >> like the above usage of two different meanings for "the loop."- Hide quoted text -
>
> >> - Show quoted text -
>
> > Thank's Dave,
> > Here my code, It's a very simple app. the Start button starts a TCP/IP
> > communication and the Stop should dtop it and kill the client.
> > I'll be thankful if you'll be able to spot my mistake.
> > Thanks again
> > Dave
>
> > #Global Variable
> > bStopLoop =alse
>
> > #Global Function
> > def execute(sockObj):
> > ? ?while(!bStopLoop):
> > ? ? ? str =ockObj.recv(1024)
> > ? ? ? tmpStr =Hello " + str
> > ? ? ? sockObj.send(tmpStr)
>
> > #Thread handle class
> > class myThread(threading.Thread):
> > ? ?def __init__(self,sockObj):
> > ? ? ? threading.Thread.__init__(self)
> > ? ? ? bStopLoop =alse
> > ? ? ? self.sockObj =ockObj
>
> > ? ?def run(self):
> > ? ? ? execute(self.SockObj)
>
> > # GUI
> > class GUI(model.Background)
>
> > ? ?def on_Start_mouseclick(self,event):
> > ? ?try:
> > ? ? ? event.target.enable =alse
> > ? ? ? event.target.redraw()
> > ? ? ? self.components.Start.enable =alse
> > ? ? ? self.currThread =yThread(self.sockObj)
> > ? ? ? self.currThread.Start()
> > ? ? ? wx.SafeYield(self)
> > ? ? ? self.components.Start.enable =rue
> > ? ?except:
> > ? ? ? .....
>
> > ? ?def on_Stop_mouseclick(self,event):
> > ? ? ? bStopLoop =rue
>
> In the two methods that try to change bStopLoop, you don't declare it
> global. ?Add the line "global bStopLoop" ?to beginning of both
>
> on_Start_mouseclick() and on_Stop_mouseclick(), and (my preference) to function execute()
>
> The semantics of global versus local variables for non-nested functions/methods is roughly: ? if a function or method assigns to a name, it's taken to be a local, unless it's explicitly declared as global.- Hide quoted text -
>
> - Show quoted text -

Thanks Dave. It works! It solved that problem. Now all i need is to
stop the socket in a way that whenever I push the Start button again
my app won't raise network connectio, but I think I'll handle that by
myself.
Thank's again
Dave.


From lie.1296 at gmail.com  Thu May 14 11:38:20 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Fri, 15 May 2009 01:38:20 +1000
Subject: itertools question
In-Reply-To: <guh5qc$lsc$1@ger.gmane.org>
References: <guh5qc$lsc$1@ger.gmane.org>
Message-ID: <guhdtn$jeg$1@ger.gmane.org>

Neal Becker wrote:
> Is there any canned iterator adaptor that will 
> 
> transform:
> in = [1,2,3....]
> 
> into:
> out = [(1,2,3,4), (5,6,7,8),...]
> 
> That is, each time next() is called, a tuple of the next N items is 
> returned.
> 
> 



An option, might be better since it handles infinite list correctly:

 >>> lst = [1, 4, 2, 5, 7, 3, 2, 5, 7, 3, 2, 6, 3, 2, 6, 8, 4, 2]
 >>> d = 4
 >>> for x in itertools.groupby(enumerate(lst), lambda x: x[0] // d):
...     print(list(x[1]))
...
[(0, 1), (1, 4), (2, 2), (3, 5)]
[(4, 7), (5, 3), (6, 2), (7, 5)]
[(8, 7), (9, 3), (10, 2), (11, 6)]
[(12, 3), (13, 2), (14, 6), (15, 8)]
[(16, 4), (17, 2)]
 >>> [list(x[1]) for x in itertools.groupby(enumerate(lst), lambda x: 
x[0] // d)]
[[(0, 1), (1, 4), (2, 2), (3, 5)], [(4, 7), (5, 3), (6, 2), (7, 5)], 
[(8, 7), (9, 3), (10, 2), (11, 6)], [(12, 3), (13, 2), (14, 6), (15, 
8)], [(16, 4), (17, 2)]]



From antroy at gmail.com  Thu May 14 11:42:14 2009
From: antroy at gmail.com (Ant)
Date: Thu, 14 May 2009 08:42:14 -0700 (PDT)
Subject: matplotlib - overlaying plots.
References: <fb29579e-4229-4d99-8ed7-201099ee8595@r36g2000vbr.googlegroups.com>
	<1223e547-6e41-4601-a3fd-f252ef2ee4e1@m24g2000vbp.googlegroups.com>
Message-ID: <6a162e77-68de-4303-9534-e5f0d2282934@e24g2000vbe.googlegroups.com>

On May 14, 3:52?pm, Hyuga <hyugaricd... at gmail.com> wrote:
...
> On the other hand, I just took a peek at the matplotlib example
> gallery, which is very diverse, and it has an example that I think is
> exactly what you're looking for:http://matplotlib.sourceforge.net/examples/api/two_scales.html

Superb - spot on. Thanks.


From wells at submute.net  Thu May 14 11:45:56 2009
From: wells at submute.net (Wells)
Date: Thu, 14 May 2009 08:45:56 -0700 (PDT)
Subject: Assigning a list to a key of a dict
Message-ID: <40cdcd9b-3964-4fb7-89ad-32bb684ee54b@o20g2000vbh.googlegroups.com>

Why can't I do this?

teams = { "SEA": "Seattle Mariners" }
for team, name in teams.items():
        teams[team]["roster"] = ["player1", "player2"]

I get an error:

Traceback (most recent call last):
  File "./gamelogs.py", line 53, in <module>
    teams[team]["roster"] = ["player1", "player2"]
TypeError: 'str' object does not support item assignment

You can see that I am trying to make a key called "roster" for each
team item in the dictionary, which is a list of players.


From nad at acm.org  Thu May 14 11:53:15 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 14 May 2009 08:53:15 -0700
Subject: itertools question
References: <guh5qc$lsc$1@ger.gmane.org>
Message-ID: <nad-A18E7F.08531514052009@news.gmane.org>

In article <guh5qc$lsc$1 at ger.gmane.org>,
 Neal Becker <ndbecker2 at gmail.com> wrote:
> Is there any canned iterator adaptor that will 
> 
> transform:
> in = [1,2,3....]
> 
> into:
> out = [(1,2,3,4), (5,6,7,8),...]
> 
> That is, each time next() is called, a tuple of the next N items is 
> returned.

This topic was discussed here just a few days ago:

<http://comments.gmane.org/gmane.comp.python.general/622763>

-- 
 Ned Deily,
 nad at acm.org



From socyl at 987jk.com.invalid  Thu May 14 11:53:23 2009
From: socyl at 987jk.com.invalid (kj)
Date: Thu, 14 May 2009 15:53:23 +0000 (UTC)
Subject: How to get all named args in a dict?
References: <guffbh$7do$1@reader1.panix.com>
	<mailman.113.1242254593.8015.python-list@python.org>
Message-ID: <guhepj$frm$1@reader1.panix.com>

In <mailman.113.1242254593.8015.python-list at python.org> Terry Reedy <tjreedy at udel.edu> writes:

>kj wrote:
>> 
>> Suppose I have the following:
>> 
>> def foo(x=None, y=None, z=None):
>>     d = {"x": x, "y": y, "z": z}
>>     return bar(d)
>> 
>> I.e. foo takes a whole bunch of named arguments and ends up calling
>> a function bar that takes a single dictionary as argument, and this
>> dictionary has the same keys as in foo's signature, so to speak.
>> 
>> Is there some builtin variable that would be the same as the variable
>> d, and would thus obviate the need to explicitly bind d?

>Use the built-in function locals()
> >>> def f(a,b):
>	x=locals()
>	print(x)

> >>> f(1,2)
>{'a': 1, 'b': 2}

That's *exactly* what I was looking for.  Thanks!

kynn


-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From agaskins_ng at kelleramerica.com  Thu May 14 11:57:27 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Thu, 14 May 2009 11:57:27 -0400
Subject: When *don't* I use 'self' in classes?
References: <rXHOl.41113$5N7.8212@newsfe09.iad>
Message-ID: <JbXOl.74825$HZ1.66158@newsfe15.iad>

Thanks a lot everyone! This really cleared it up for me! :)

"Adam Gaskins" <agaskins_ng at kelleramerica.com> wrote in message 
news:rXHOl.41113$5N7.8212 at newsfe09.iad...
>I am a bit confused as too when, if ever, it is not appropriate to prepend 
>'self' to objects in a class. All of the examples of how to use 'self' that 
>I find seem to be short and very simple (as examples tent to be). I 
>appologize if I am asking an ignorant question here, but I want to get off 
>on the right foot. Here's an example of what I mean:
>
> import serial
> class foo:
>    def __init(self, comport):
>        self.comport = comport
>        self.baudrate = 9600 #default
>        self.ser = serial
>        try:
>            self.ser.Serial()
>            self.ser.baudrate = self.baudrate
>            self.ser.open()
>        except:
>            print 'Serial port could not be opened'
>
> === OR ===
> import serial
> class foo:
>    def __init(self, comport):
>        self.comport = comport
>        self.baudrate = 9600 #default
>        try:
>            ser = serial.Serial()
>            ser.baudrate = self.baudrate
>            ser.open()
>        except:
>            print 'Serial port could not be opened'
>
> There may be a typo in here, this is just a random example similar to 
> something I'm working with, but which one of these are more 'proper'? If I 
> am importing a library do I still prepend it's object with self when I use 
> it in my class? I suppose my question is just basically... when do you NOT 
> prepent an object in a class with 'self'?
>
> I'm not even sure I'm using the term 'object' correctly here. Feel free to 
> set me straight, but I hope my example makes it clear what I am asking.
>
> Thanks a lot, this ng has already been super helpful as I take my 
> crash-course in to python! :P
> 




From ccurvey at gmail.com  Thu May 14 11:57:33 2009
From: ccurvey at gmail.com (Chris Curvey)
Date: Thu, 14 May 2009 08:57:33 -0700 (PDT)
Subject: capture stdout and stderror from within a Windows Service?
Message-ID: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>

I'm trying to get this invocation right, and it is escaping me.  How
can I capture the stdout and stderr if I launch a subprocess using
subprocess.check_call()?  The twist here is that the call is running
from within a Windows service.

I've tried:

check_call("mycmd.exe", stdout=subprocess.PIPE)  [raises an exception
"An integer is required"]

check_call("mycmd.exe", stdout=file("c:\\temp\\foobar.txt", "w"))
[raises an exception "An integer is required"]


From deets at nospam.web.de  Thu May 14 11:57:40 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 14 May 2009 17:57:40 +0200
Subject: Assigning a list to a key of a dict
References: <40cdcd9b-3964-4fb7-89ad-32bb684ee54b@o20g2000vbh.googlegroups.com>
Message-ID: <772t82F1edjpdU1@mid.uni-berlin.de>

Wells wrote:

> Why can't I do this?
> 
> teams = { "SEA": "Seattle Mariners" }
> for team, name in teams.items():
>         teams[team]["roster"] = ["player1", "player2"]
> 
> I get an error:
> 
> Traceback (most recent call last):
>   File "./gamelogs.py", line 53, in <module>
>     teams[team]["roster"] = ["player1", "player2"]
> TypeError: 'str' object does not support item assignment
> 
> You can see that I am trying to make a key called "roster" for each
> team item in the dictionary, which is a list of players.

This is not a list as key, it's a nested dictionary. There are several
approaches to this:

 - make your keys tuples, like this:

>>> teams[(team, "roster") = [...]

 - use setedfault:

>>> teams.setdefault(team, {})["roster"] = ['player1']

 - defaultdict

>>> from collections import *
>>> defaultdict
<type 'collections.defaultdict'>
>>> teams = defaultdict(dict)
>>> teams["team"]["roster"] = ["player1"]
>>> teams
defaultdict(<type 'dict'>, {'team': {'roster': ['player1']}})
>>>                                                   

Diez


From marco at sferacarta.com  Thu May 14 11:57:47 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Thu, 14 May 2009 17:57:47 +0200
Subject: introspection question: get return type
In-Reply-To: <4a0c1a0e$0$31748$426a74cc@news.free.fr>
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<4a0c1a0e$0$31748$426a74cc@news.free.fr>
Message-ID: <%bXOl.15204$Ux.561@tornado.fastwebnet.it>

Bruno Desthuilliers wrote:

> Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
> sense given Python's dynamic typing.

I thought that the OP was writing a tool to document not-very-dynamic code.

Unless he's really trying to write in Nohtyp, the language where value 
types are more important than values ;)



From clp2 at rebertia.com  Thu May 14 11:58:04 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 14 May 2009 08:58:04 -0700
Subject: Assigning a list to a key of a dict
In-Reply-To: <40cdcd9b-3964-4fb7-89ad-32bb684ee54b@o20g2000vbh.googlegroups.com>
References: <40cdcd9b-3964-4fb7-89ad-32bb684ee54b@o20g2000vbh.googlegroups.com>
Message-ID: <50697b2c0905140858u75ef1833xe00646dd13fcc9cf@mail.gmail.com>

On Thu, May 14, 2009 at 8:45 AM, Wells <wells at submute.net> wrote:
> Why can't I do this?
>
> teams = { "SEA": "Seattle Mariners" }
> for team, name in teams.items():
> ? ? ? ?teams[team]["roster"] = ["player1", "player2"]
> I get an error:
>
> Traceback (most recent call last):
> ?File "./gamelogs.py", line 53, in <module>
> ? ?teams[team]["roster"] = ["player1", "player2"]
> TypeError: 'str' object does not support item assignment

teams - a dict of str to str
teams[team] - a string (specifically, "Seattle Mariners" in this case)
teams[team]["roster"] - um, you can't subscript a string by another
string; you can subscript it only by integer indices

> You can see that I am trying to make a key called "roster" for each
> team item in the dictionary, which is a list of players.

I'd say you need to restructure your data structure by introducing
another level of dictionaries:

teams = { "SEA": {"full_name":"Seattle Mariners"} }
for team, name in teams.items():
    teams[team]["roster"] = ["player1", "player2"]
print teams
#output: {'SEA': {'full_name': 'Seattle Mariners', 'roster':
['player1', 'player2']}}

Of course, it would probably be nicer if you did this using objects
(e.g. define a Team class and have `teams` be a dict of str to Team.

Cheers,
Chris
-- 
http://blog.rebertia.com


From gherron at islandtraining.com  Thu May 14 11:59:10 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 14 May 2009 08:59:10 -0700
Subject: Assigning a list to a key of a dict
In-Reply-To: <40cdcd9b-3964-4fb7-89ad-32bb684ee54b@o20g2000vbh.googlegroups.com>
References: <40cdcd9b-3964-4fb7-89ad-32bb684ee54b@o20g2000vbh.googlegroups.com>
Message-ID: <4A0C3FCE.5030400@islandtraining.com>

Wells wrote:
> Why can't I do this?
>
> teams = { "SEA": "Seattle Mariners" }
> for team, name in teams.items():
>         teams[team]["roster"] = ["player1", "player2"]
>   

Because,
  team will be "SEA",
so 
  teams[team] will be  "Seattle Mariners"
and
  "Seattle Mariners"["roster"] makes no sense.



Gary Herron


> I get an error:
>
> Traceback (most recent call last):
>   File "./gamelogs.py", line 53, in <module>
>     teams[team]["roster"] = ["player1", "player2"]
> TypeError: 'str' object does not support item assignment
>
> You can see that I am trying to make a key called "roster" for each
> team item in the dictionary, which is a list of players.
>   



From clp2 at rebertia.com  Thu May 14 12:00:44 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 14 May 2009 09:00:44 -0700
Subject: itertools question
In-Reply-To: <nad-A18E7F.08531514052009@news.gmane.org>
References: <guh5qc$lsc$1@ger.gmane.org>
	<nad-A18E7F.08531514052009@news.gmane.org>
Message-ID: <50697b2c0905140900g695e5c20if6d44a9e03922726@mail.gmail.com>

On Thu, May 14, 2009 at 8:53 AM, Ned Deily <nad at acm.org> wrote:
> In article <guh5qc$lsc$1 at ger.gmane.org>,
> ?Neal Becker <ndbecker2 at gmail.com> wrote:
>> Is there any canned iterator adaptor that will
>>
>> transform:
>> in = [1,2,3....]
>>
>> into:
>> out = [(1,2,3,4), (5,6,7,8),...]
>>
>> That is, each time next() is called, a tuple of the next N items is
>> returned.
>
> This topic was discussed here just a few days ago:
>
> <http://comments.gmane.org/gmane.comp.python.general/622763>

They really should just add grouper() to itertools rather than leaving
it as a recipe. People keep asking for it so often...

Cheers,
Chris
-- 
http://blog.rebertia.com


From clp2 at rebertia.com  Thu May 14 12:08:08 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 14 May 2009 09:08:08 -0700
Subject: capture stdout and stderror from within a Windows Service?
In-Reply-To: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
References: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
Message-ID: <50697b2c0905140908x564e8555oe5b889012cc420fb@mail.gmail.com>

On Thu, May 14, 2009 at 8:57 AM, Chris Curvey <ccurvey at gmail.com> wrote:
> I'm trying to get this invocation right, and it is escaping me. ?How
> can I capture the stdout and stderr if I launch a subprocess using
> subprocess.check_call()? ?The twist here is that the call is running
> from within a Windows service.
>
> I've tried:
>
> check_call("mycmd.exe", stdout=subprocess.PIPE) ?[raises an exception
> "An integer is required"]
>
> check_call("mycmd.exe", stdout=file("c:\\temp\\foobar.txt", "w"))
> [raises an exception "An integer is required"]

Providing the full exception Tracebacks would be highly recommended.

Cheers,
Chris
-- 
http://blog.rebertia.com


From norseman at hughes.net  Thu May 14 12:14:34 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 09:14:34 -0700
Subject: matplotlib - overlaying plots.
In-Reply-To: <fb29579e-4229-4d99-8ed7-201099ee8595@r36g2000vbr.googlegroups.com>
References: <fb29579e-4229-4d99-8ed7-201099ee8595@r36g2000vbr.googlegroups.com>
Message-ID: <4A0C436A.7040408@hughes.net>

Ant wrote:
> Hi All,
> 
> I am trying to get matplotlib to overlay a couple of graphs, but am
> getting nowhere. I originally thought that the following may work:
> 
>>>> x = [1,2,3,4,5]
>>>> y = [2,4,6,8,10]
>>>> y2 = [1,4,9,16,25]
> 
>>>> plot(x, y)
>>>> plot(x, y2)
> 
> Now this works as desired, however, the actual case I have is more
> like this:
> 
>>>> x = [1,2,3,4,5]
>>>> y = [2,4,6,8,10]
>>>> y2 = [.0001, .0002, .0003, .0004, .0005]
> 
> Now the graph is useless, since the results are plotted on the same
> axis. What I really want is two different sets of axes, each scaled
> appropriately, but overlayed.
> 
> The data I actually have, is one set of axes plotting distance against
> elevation, and a second plotting distance against speed. The former
> has (y-coord) units in the range 0-2000 ft and the latter 0 - 0.01
> miles/second. I want them on the same graph, so points can be easily
> correlated, but overlayed so that each line has a different scale on
> the y-axis. The closest I can get is to have two subplots, one above
> the other.
> 
> Thanks in advance,
> 
> Ant.
> 

======================
Use scalers to 'sync' the axis (x or y or both on the page)
The 'scales' along the axis need to match or you get your problem.

You know - like trying to do 1:1 but one is meters and the other feet.
That case needs two different graphs (or CAD drawings) each with its own 
legend.  The scales are not the same.  ie... 100meters is not 100feet
By scalling to same units/distance on graph you get overlay ability.

my first thought on your 0-2000ft and miles/sec is to convert miles to 
feet and multiply time by enough to be integer values and see if you get 
a better visual

one graph means one set of units per axis
              or
plot each and scale one to the other
   (in CAD it's a case of meters/3.280833333_ to reduce to feet units
   .3048 * meters if using International scaler
   meters/3.280833333333(infinitely repeating 3s) is US Standard.
   The difference cost us a mars rover.
   You don't seem to be metric vs US but you do have miss matched units.
   miles vs feet, time vs (feet)elevation
   or whatever the units distance/elevation may be.
   )
target_size / 2nd_graph unit => scaler for that axis (mostly)
   since the units are not completely the same type you may need
   to experiment.
     same units would be  time time          hours days seconds
                          linear linear      meter feet mile
                          angular angular    mils degrees rads
     and so forth.

HTH


Steve


From invalid at invalid  Thu May 14 12:16:51 2009
From: invalid at invalid (Grant Edwards)
Date: Thu, 14 May 2009 11:16:51 -0500
Subject: capture stdout and stderror from within a Windows Service?
References: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
Message-ID: <fbKdndszhZhu3pHXnZ2dnUVZ_uydnZ2d@posted.visi>

On 2009-05-14, Chris Curvey <ccurvey at gmail.com> wrote:
> I'm trying to get this invocation right, and it is escaping me.  How
> can I capture the stdout and stderr if I launch a subprocess using
> subprocess.check_call()?  The twist here is that the call is running
> from within a Windows service.
>
> I've tried:
>
> check_call("mycmd.exe", stdout=subprocess.PIPE)  [raises an exception
> "An integer is required"]
>
> check_call("mycmd.exe", stdout=file("c:\\temp\\foobar.txt", "w"))
> [raises an exception "An integer is required"]

An educated guess...

By default, subprocess will use the existing stdin, stdout, and
stderr filedescriptors for the child process. Since services
presumably don't have valid file descriptors for stdin, stdout,
and stderr, you probably have to tell subprocess to use pipes
for all three.  Otherwise, it will default to using the invalid
or nonexistant file descriptors of the parent.

[If you reply, I proably won't see it.  All posts from google
groups are plonked by my newsreader configuration.  It was
somewhat of a fluke that I came across your posting.]

-- 
Grant Edwards                   grante             Yow! On the road, ZIPPY
                                  at               is a pinhead without a
                               visi.com            purpose, but never without
                                                   a POINT.


From norseman at hughes.net  Thu May 14 12:23:15 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 09:23:15 -0700
Subject: about Python doc reader
In-Reply-To: <4A0C3162.4070508@timgolden.me.uk>
References: <OFD96BAB24.BD84D016-ON652575B5.003BCBFF-652575B5.003C0EB9@tcs.com>	<4A0AC4C7.1060000@timgolden.me.uk>	<4A0B350A.7040006@hughes.net>
	<4A0B403F.2090806@hughes.net> <4A0C3162.4070508@timgolden.me.uk>
Message-ID: <4A0C4573.9090801@hughes.net>

Tim Golden wrote:
> norseman wrote:
>> I did try these.
>>
>> Doc at once:
>> outputs two x'0D' and the file.  Then it appends x'0D' x'0D' x'0A' 
>> x'0D' x'0A' to end of file even though source file itself has no EOL.
>> ( EOL is EndOfLine  aka newline )
>>
>> That's  cr cr             There are two blank lines at begining.
>>         cr cr lf cr lf    There is no EOL in source
>>                           Any idea what those are about?
>> One crlf is probably from python's print text, but the other?
>>
>> The lines=
>> appends   [u'\r', u'\r', u"  to begining of output
>> and   \r"]x'0D'x'0A'   to the end even though there is no EOL in source.
>>
>> output is understood:    u'\r'  is Apple EOL
>> the crlf is probably from print lines.
> 
> Not clear what you're doing to get there. This is the (wrapped) output 
> from my interpreter, using Word 2003. As you can see, new
> doc: one "\r", nothing more.
> 
> <dump>
> Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit 
> (Intel)] on win32
> Type "help", "copyright", "credits" or "license" for more information.
>  >>> import win32com.client
>  >>> word = win32com.client.gencache.EnsureDispatch ("Word.Application")
>  >>> doc = word.Documents.Add ()
>  >>> print repr (doc.Range ().Text)
> u'\r'
>  >>>
> 
> </dump>
> 
==============
The original "do it this way" snippets were:
<code>
import win32com.client

doc = win32com.client.GetObject ("c:/temp/temp.doc")
text = doc.Range ().Text

</code>

Note that this will give you a unicode object with \r line-delimiters.
You could read para by para if that were more useful:

<code>
import win32com.client

doc = win32com.client.GetObject ("c:/temp/temp.doc")
lines = [p.Range () for p in doc.Paragraphs]

</code>


and I added:

print text    after "text =" line above

print lines   after "lines =" line above

then ran file using   python test.py >letmesee
followed by viewing letmesee in hex



Steve





From R.Brodie at rl.ac.uk  Thu May 14 12:33:48 2009
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Thu, 14 May 2009 17:33:48 +0100
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com>
	<gugpup$1r7$1@south.jnrs.ja.net>
	<747b0d4f-f9fd-4fa6-bb6d-0a4365f328ba@b1g2000vbc.googlegroups.com>
Message-ID: <guhh5c$8dc$1@south.jnrs.ja.net>


"Tomas Svarovsky" <svarovsky.tomas at gmail.com> wrote in message 
news:747b0d4f-f9fd-4fa6-bb6d-0a4365f328ba at b1g2000vbc.googlegroups.com...

> This is a good point, but then it would manifest regardless of the
> language used AFAIK. And this is not the case, ruby and php
> implementations are working quite fine.

What I meant was: not reading the data and leaving the connection
open is going to force the server to handle all 100 requests concurrently.
I'm guessing that's not what your other implementations do.
What happens to the timing if you call response.read(), response.close() ? 




From norseman at hughes.net  Thu May 14 12:49:33 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 09:49:33 -0700
Subject: Odd list behavior
In-Reply-To: <op.utv27casa8ncjz@gnudebst>
References: <4A0B40E0.2060600@gmail.com> <4A0B44DA.2040107@hughes.net>
	<op.utv27casa8ncjz@gnudebst>
Message-ID: <4A0C4B9D.20301@hughes.net>

Rhodri James wrote:
> On Wed, 13 May 2009 23:08:26 +0100, norseman <norseman at hughes.net> wrote:
> 
>> Evan Kroske wrote:
>>> I'm working on a simple file processing utility, and I encountered a 
>>> weird error. If I try to get the first element of a list I'm 
>>> splitting from a string, I get an error:
>>>  key = string.split()[0]
>>> Error!
>>>  However, I can slice the list like normal, but that gives me a 
>>> one-element-long list:
>>>  key = string.split()[:1]
>>> Success!
>>>  Finally, the operation works perfectly if I initialize the list 
>>> beforehand:
>>>  list = string.split()
>>> key = list[0]
>>> Success!
>>>  Why does this happen?
> 
>>
>> ==========================
>> Take a look at the  split() command.
>>
>> I think you will find you need one var on the left side for each piece 
>> on the right.
> 
> Given that he's immediately indexing the split results, that's irrelevant.
> There's no point in even guessing with out the traceback.
> 

"...the first element of a list..."
"key = string.split()[0]"
if the list is a list of tuples the error message is correct.
same for a list of key:value pairs
he will need one var on left for each piece of [0]
  k,v=  list.split(key:value)    ??!!


Steve


From norseman at hughes.net  Thu May 14 13:02:21 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 10:02:21 -0700
Subject: capture stdout and stderror from within a Windows Service?
In-Reply-To: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
References: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
Message-ID: <4A0C4E9D.30507@hughes.net>

Chris Curvey wrote:
> I'm trying to get this invocation right, and it is escaping me.  How
> can I capture the stdout and stderr if I launch a subprocess using
> subprocess.check_call()?  The twist here is that the call is running
> from within a Windows service.
> 
> I've tried:
> 
> check_call("mycmd.exe", stdout=subprocess.PIPE)  [raises an exception
> "An integer is required"]

mycmd.exe isn't open (running). the mycmd.exe is supposed to be a fn.
How did you start it?

> 
> check_call("mycmd.exe", stdout=file("c:\\temp\\foobar.txt", "w"))
> [raises an exception "An integer is required"]
==============
I think you need to run the .exe from your .py using the subprocess 
module's commands and hook in at that time to stdin, stdout, ....
get the fn and use check_call() to see if .exe has something to say.

Check subprocess's help/man and so forth.

I know that if you start a program via os.Popen2's popen3 things work as 
expected.  How you would redirect I/O in an arbitrary already running 
program in Windows is a good question.


Steve


From manu3d at gmail.com  Thu May 14 13:04:58 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Thu, 14 May 2009 10:04:58 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
	<fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com>
Message-ID: <d3631430-f8b9-42ce-af42-df4f3c5ef186@o14g2000vbo.googlegroups.com>

Thank you Paul for your reply!

I'm looking into pxdom right now and it looks very good and useful!

Thank you again!

Manu



From lie.1296 at gmail.com  Thu May 14 13:06:38 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 14 May 2009 17:06:38 GMT
Subject: itertools question
In-Reply-To: <mailman.149.1242316847.8015.python-list@python.org>
References: <guh5qc$lsc$1@ger.gmane.org>	<nad-A18E7F.08531514052009@news.gmane.org>
	<mailman.149.1242316847.8015.python-list@python.org>
Message-ID: <ycYOl.11027$y61.8941@news-server.bigpond.net.au>

Chris Rebert wrote:
> They really should just add grouper() to itertools rather than leaving
> it as a recipe. People keep asking for it so often...

I've just added it to the issue tracker: http://bugs.python.org/issue6021


From bdesth.quelquechose at free.quelquepart.fr  Thu May 14 13:19:31 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Thu, 14 May 2009 19:19:31 +0200
Subject: introspection question: get return type
In-Reply-To: <%bXOl.15204$Ux.561@tornado.fastwebnet.it>
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<4a0c1a0e$0$31748$426a74cc@news.free.fr>
	<%bXOl.15204$Ux.561@tornado.fastwebnet.it>
Message-ID: <4a0c6e42$0$12031$426a74cc@news.free.fr>

Marco Mariani a ?crit :
> Bruno Desthuilliers wrote:
> 
>> Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
>> sense given Python's dynamic typing.
> 
> I thought that the OP was writing a tool to document not-very-dynamic code.

>
> Unless he's really trying to write in Nohtyp,

You meant "Notype" ?-)

> the language where value 
> types are more important than values ;)

Hence it's name !-)


From vavasis at cpu111.math.uwaterloo.ca  Thu May 14 13:25:00 2009
From: vavasis at cpu111.math.uwaterloo.ca (Stephen Vavasis)
Date: Thu, 14 May 2009 17:25:00 +0000 (UTC)
Subject: C API: how to replace python number object in place?
Message-ID: <guhk5c$gb2$1@rumours.uwaterloo.ca>

If x is a C variable of type PyObject*, and I happen to know already that 
the object is of a numeric type, say int, is there a way to change the 
value of x in place to a different number?  In the C/API documentation I 
found routines to increment or decrement it in place, but I didn't find a 
routine to simply replace its value by a different value.  (I suppose I 
could change it to the new value via an increment or decrement, but this 
is ugly as well as being susceptible to overflow problems and roundoff 
errors in the case of floats.)

Thanks,
Steve Vavasis


From bdesth.quelquechose at free.quelquepart.fr  Thu May 14 13:31:07 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Thu, 14 May 2009 19:31:07 +0200
Subject: When *don't* I use 'self' in classes?
In-Reply-To: <mailman.117.1242257951.8015.python-list@python.org>
References: <rXHOl.41113$5N7.8212@newsfe09.iad>
	<mailman.117.1242257951.8015.python-list@python.org>
Message-ID: <4a0c70f9$0$18747$426a74cc@news.free.fr>

Tim Chase a ?crit :
(snip)


>      try:
>        self.ser = Serial()
>        self.ser.baudrate = DEFAULT_BAUD
>        self.ser.open()
>      except SomeSpecificException:
>        print "Fail!"
> 

Please make it:


       try:
         self.ser = Serial()
         self.ser.baudrate = DEFAULT_BAUD
         self.ser.open()
       except SomeSpecificException, e:
         print "Fail! reason : %s" % e


From jenn.duerr at gmail.com  Thu May 14 13:41:17 2009
From: jenn.duerr at gmail.com (noydb)
Date: Thu, 14 May 2009 10:41:17 -0700 (PDT)
Subject: putting date strings in order
References: mailman.52.1242143921.8015.python-list@python.org 
	<a276bc1e-a800-4dbc-ac77-55923ccf36c8@f1g2000prb.googlegroups.com>
Message-ID: <dc7e9d9c-5957-45ab-9228-70dafbe46e7a@n4g2000vba.googlegroups.com>

On May 12, 12:26?pm, John Machin <sjmac... at lexicon.net> wrote:
> On May 13, 1:58?am, Jaime Fernandez del Rio <jaime.f... at gmail.com>
> wrote:
>
>
>
>
>
> > On Tue, May 12, 2009 at 5:02 PM, MRAB <goo... at mrabarnett.plus.com> wrote:
> > > John Machin wrote:
>
> > >> MRAB <google <at> mrabarnett.plus.com> writes:
>
> > >>> Sort the list, passing a function as the 'key' argument. The function
> > >>> should return an integer for the month, eg 0 for 'jan', 1 for 'feb'. If
> > >>> you want to have a different start month then add
>
> > >> and if you don't like what that produces, try subtract :-)
>
> > > Oops!
>
> > >>> the appropriate
> > >>> integer for that month (eg 0 for 'jan', 1 for 'feb') and then modulo 12
> > >>> to make it wrap around (there are only 12 months in a year), returning
> > >>> the result.
>
> > > Actually, subtract the start month, add 12, and then modulo 12.
>
> > Both on my Linux and my Windows pythons, modulos of negative numbers
> > are properly taken, returning always the correct positive number
> > between 0 and 11. I seem to recall, from my distant past, that Perl
> > took pride on this being a language feature. Anyone knows if that is
> > not the case with python, and so not adding 12 before taking the
> > modulo could result in wrong results in some implementations?
>
> If that happens, it's a bug.http://docs.python.org/reference/expressions.html#binary-arithmetic-o...
>
> If you look at function i_divmod() in the 2.x branch's Objects/
> intobject.c, you'll be reassured to see that it doesn't just take
> whatever C serves up :-)- Hide quoted text -
>
> - Show quoted text -

Thanks to those who provided suggestions.  I ended up using code
similar to what Jaime provided above first -- truly eloquent and
simple, especially compared to my original thoughts of several messy
loops.  I knew it could be done way better.  Thanks very much Jaime!!
That was a good learning experience for me.

fairly finished portion of code:

ordered_raster_list = []

pRasters = gp.ListRasters("precip_*", "All") # an enumeration object,
arcgis method
pRast = pRasters.next()
while pRast:
##    month = pRast[-3:]
##    print month
    print pRast
    ordered_raster_list.append(pRast)
    pRast = pRasters.next()


print ordered_raster_list #unordered at this point

# create a dictionary dictating the order of the the precip_<months>
rasters
monthsD = {"precip_jan" : 1, "precip_feb" : 2, "precip_mar" : 3,
"precip_apr" : 4, "precip_may" : 5, "precip_jun" : 6,
           "precip_jul" : 7, "precip_aug" : 8, "precip_sep" : 9,
"precip_oct" : 10, "precip_nov" : 11, "precip_dec" : 12}

# sort the list based on the dictionary
ordered_raster_list.sort(None, lambda x : monthsD[x])

print ordered_raster_list #ordered

start = 2 #user to define, starting month

ordered_raster_list = ordered_raster_list[start - 1:] +
ordered_raster_list[:start - 1]

print ordered_raster_list #ordered but starting in the middle, feb in
this case, ending with jan


From __peter__ at web.de  Thu May 14 14:13:28 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 14 May 2009 20:13:28 +0200
Subject: putting date strings in order
References: <dc7e9d9c-5957-45ab-9228-70dafbe46e7a@n4g2000vba.googlegroups.com>
Message-ID: <guhn01$j0r$03$1@news.t-online.com>

noydb wrote:

> On May 12, 12:26 pm, John Machin <sjmac... at lexicon.net> wrote:
>> On May 13, 1:58 am, Jaime Fernandez del Rio <jaime.f... at gmail.com>
>> wrote:
>>
>>
>>
>>
>>
>> > On Tue, May 12, 2009 at 5:02 PM, MRAB <goo... at mrabarnett.plus.com>
>> > wrote:
>> > > John Machin wrote:
>>
>> > >> MRAB <google <at> mrabarnett.plus.com> writes:
>>
>> > >>> Sort the list, passing a function as the 'key' argument. The
>> > >>> function should return an integer for the month, eg 0 for 'jan', 1
>> > >>> for 'feb'. If you want to have a different start month then add
>>
>> > >> and if you don't like what that produces, try subtract :-)
>>
>> > > Oops!
>>
>> > >>> the appropriate
>> > >>> integer for that month (eg 0 for 'jan', 1 for 'feb') and then
>> > >>> modulo 12 to make it wrap around (there are only 12 months in a
>> > >>> year), returning the result.
>>
>> > > Actually, subtract the start month, add 12, and then modulo 12.
>>
>> > Both on my Linux and my Windows pythons, modulos of negative numbers
>> > are properly taken, returning always the correct positive number
>> > between 0 and 11. I seem to recall, from my distant past, that Perl
>> > took pride on this being a language feature. Anyone knows if that is
>> > not the case with python, and so not adding 12 before taking the
>> > modulo could result in wrong results in some implementations?
>>
>> If that happens, it's a
>> bug.http://docs.python.org/reference/expressions.html#binary-arithmetic-
o...
>>
>> If you look at function i_divmod() in the 2.x branch's Objects/
>> intobject.c, you'll be reassured to see that it doesn't just take
>> whatever C serves up :-)- Hide quoted text -
>>
>> - Show quoted text -
> 
> Thanks to those who provided suggestions.  I ended up using code
> similar to what Jaime provided above first -- truly eloquent and
> simple, especially compared to my original thoughts of several messy
> loops.  I knew it could be done way better.  Thanks very much Jaime!!
> That was a good learning experience for me.
> 
> fairly finished portion of code:
> 
> ordered_raster_list = []
> 
> pRasters = gp.ListRasters("precip_*", "All") # an enumeration object,
> arcgis method
> pRast = pRasters.next()
> while pRast:
> ##    month = pRast[-3:]
> ##    print month
>     print pRast
>     ordered_raster_list.append(pRast)
>     pRast = pRasters.next()
> 
> 
> print ordered_raster_list #unordered at this point
> 
> # create a dictionary dictating the order of the the precip_<months>
> rasters
> monthsD = {"precip_jan" : 1, "precip_feb" : 2, "precip_mar" : 3,
> "precip_apr" : 4, "precip_may" : 5, "precip_jun" : 6,
>            "precip_jul" : 7, "precip_aug" : 8, "precip_sep" : 9,
> "precip_oct" : 10, "precip_nov" : 11, "precip_dec" : 12}
> 
> # sort the list based on the dictionary
> ordered_raster_list.sort(None, lambda x : monthsD[x])
> 
> print ordered_raster_list #ordered
> 
> start = 2 #user to define, starting month
> 
> ordered_raster_list = ordered_raster_list[start - 1:] +
> ordered_raster_list[:start - 1]
> 
> print ordered_raster_list #ordered but starting in the middle, feb in
> this case, ending with jan

Hm, if ordered_raster_list is guaranteed to contain one string item for 
every month the above can be simplified to

months = [
    'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr', 
    'precip_may', 'precip_jun', 'precip_jul', 'precip_aug', 
    'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec']

start = 2
ordered_raster_list = months[start-1:] + months[:start-1]

print ordered_raster_list

What am I missing?

Peter



From benjamin at python.org  Thu May 14 14:47:40 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Thu, 14 May 2009 18:47:40 +0000 (UTC)
Subject: C API: how to replace python number object in place?
References: <guhk5c$gb2$1@rumours.uwaterloo.ca>
Message-ID: <loom.20090514T184620-738@post.gmane.org>

Stephen Vavasis <vavasis <at> cpu111.math.uwaterloo.ca> writes:

> 
> If x is a C variable of type PyObject*, and I happen to know already that 
> the object is of a numeric type, say int, is there a way to change the 
> value of x in place to a different number?  In the C/API documentation I 
> found routines to increment or decrement it in place, but I didn't find a 
> routine to simply replace its value by a different value.  (I suppose I 
> could change it to the new value via an increment or decrement, but this 
> is ugly as well as being susceptible to overflow problems and roundoff 
> errors in the case of floats.)

Even in the C-API, Python ints and longs are immutable. You can convert it to a
C int and work with it, otherwise you have to use the APIs which create new
objects: PyNumber_Add etc...





From davea at ieee.org  Thu May 14 15:07:27 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 14 May 2009 15:07:27 -0400
Subject: How to get all named args in a dict?
In-Reply-To: <guhepj$frm$1@reader1.panix.com>
References: <guffbh$7do$1@reader1.panix.com>	<mailman.113.1242254593.8015.python-list@python.org>
	<guhepj$frm$1@reader1.panix.com>
Message-ID: <4A0C6BEF.1010709@ieee.org>



kj wrote:
> In <mailman.113.1242254593.8015.python-list at python.org> Terry Reedy <tjreedy at udel.edu> writes:
>
>   
>> kj wrote:
>>     
>>> Suppose I have the following:
>>>
>>> def foo(x=None, y=None, z=None):
>>>     d = {"x": x, "y": y, "z": z}
>>>     return bar(d)
>>>
>>> I.e. foo takes a whole bunch of named arguments and ends up calling
>>> a function bar that takes a single dictionary as argument, and this
>>> dictionary has the same keys as in foo's signature, so to speak.
>>>
>>> Is there some builtin variable that would be the same as the variable
>>> d, and would thus obviate the need to explicitly bind d?
>>>       
>
>   
>> Use the built-in function locals()
>>     
>>>>> def f(a,b):
>>>>>           
>> 	x=locals()
>> 	print(x)
>>     
>
>   
>>>>> f(1,2)
>>>>>           
>> {'a': 1, 'b': 2}
>>     
>
> That's *exactly* what I was looking for.  Thanks!
>
> kynn
>
>
>   
You already had a better answer from Chris Rebert:

def foo(**kwargs):
    return bar(kwargs)

kwargs at this point is exactly a dictionary of the named arguments to foo.

Because if you try to do anything in this function, you'll probably be 
adding more local variables. And then they'd be passed to bar as well.




From stef.mientki at gmail.com  Thu May 14 15:20:07 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Thu, 14 May 2009 21:20:07 +0200
Subject: OS independent file associate ?
Message-ID: <4A0C6EE7.3070709@gmail.com>

hello,

I would like to make my programs available under the "standard" OS's, 
like Windows, Linux  (,Mac)
One of the problems I encounter, is launching of files through their 
file associates (probably a windows only terminology ;-)
Now I can detect the OS, but only the main OS and not e.g. Ubuntu / 
Gnome or whatever I've to detect.
Through trial and error I found a working mechanism under Ubuntu, but as 
I have to specify "gnome", I doubt this will work under other Linux systems.

any good solutions available ?

thanks,
Stef Mientki

    import subprocess
    CHM = '../numpy.chm'
 
    # works under Ubuntu
    subprocess.Popen( "gnome-open " + CHM , shell = True )

    # doesn't work under Ubuntu
    # (the list should be converted to a number of arguments,
    #but that doesn't seem to work under Ubuntu.
    subprocess.Popen( [ "gnome-open" , CHM] ,shell = True )

    # works under Windows
    subprocess.Popen( CHM , shell = True )

    # works better under windows
    win32help.HtmlHelp ( Win32_Viewer,
                         str(CHM),
                         win32help.HH_DISPLAY_INDEX,
                         str ( keyword ) )

   


From socyl at 987jk.com.invalid  Thu May 14 15:31:55 2009
From: socyl at 987jk.com.invalid (kj)
Date: Thu, 14 May 2009 19:31:55 +0000 (UTC)
Subject: How to get the formal args of a function object?
Message-ID: <guhrjb$79i$1@reader1.panix.com>



Suppose that f is an object whose type is 'function'.

Is there a way to find out f's list of formal arguments?

The reason for this is that I'm trying to write a decorator and
I'd like the wrapper to be able to check the number of arguments
passed.  Specifically, I'd like the wrapper to look as shown below:

def _wrap(f):
    def wrapper(self, *params):
        n_expected = len(f.FORMAL_ARGS)
        n_received = len(params)
        if n_received is not n_expected:
            raise RuntimeError("Wrong number of arguments passed "
                               "to %s" % f.__name__)
        return self.send_jsonrpc_request(f.__name__, params)
    return wrapper

...but I'm missing something like the hypothetical attribute
FORMAL_ARGS above.

TIA!

Kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From aahz at pythoncraft.com  Thu May 14 15:55:43 2009
From: aahz at pythoncraft.com (Aahz)
Date: 14 May 2009 12:55:43 -0700
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<4a0c1a0e$0$31748$426a74cc@news.free.fr>
	<%bXOl.15204$Ux.561@tornado.fastwebnet.it>
	<4a0c6e42$0$12031$426a74cc@news.free.fr>
Message-ID: <guhsvv$cu$1@panix3.panix.com>

In article <4a0c6e42$0$12031$426a74cc at news.free.fr>,
Bruno Desthuilliers  <bdesth.quelquechose at free.quelquepart.fr> wrote:
>Marco Mariani a ?crit :
>> Bruno Desthuilliers wrote:
>>> 
>>> Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
>>> sense given Python's dynamic typing.
>>
>> Unless he's really trying to write in Nohtyp,
>
>You meant "Notype" ?-)

Marco's spelling is correct.  Try "Nohtyp".reverse()
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan


From Scott.Daniels at Acm.Org  Thu May 14 16:13:09 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 14 May 2009 13:13:09 -0700
Subject: putting date strings in order
In-Reply-To: <guhn01$j0r$03$1@news.t-online.com>
References: <dc7e9d9c-5957-45ab-9228-70dafbe46e7a@n4g2000vba.googlegroups.com>
	<guhn01$j0r$03$1@news.t-online.com>
Message-ID: <UImdnbqCOMOL55HXnZ2dnUVZ_gCdnZ2d@pdx.net>

Peter Otten wrote:
> Hm, if ordered_raster_list is guaranteed to contain one string item for 
> every month the above can be simplified to
> 
> months = [
>     'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr', 
>     'precip_may', 'precip_jun', 'precip_jul', 'precip_aug', 
>     'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec']
> 
> start = 2
> ordered_raster_list = months[start-1:] + months[:start-1]

Or even:
 >
     multi_months = [
         'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr',
         'precip_may', 'precip_jun', 'precip_jul', 'precip_aug',
         'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec'] * 2
     start = 2
     ordered_raster_list = multi_months[start - 1: start + 11]

--Scott David Daniels
Scott.Daniels at Acm.Org


From socyl at 987jk.com.invalid  Thu May 14 16:15:26 2009
From: socyl at 987jk.com.invalid (kj)
Date: Thu, 14 May 2009 20:15:26 +0000 (UTC)
Subject: How to get all named args in a dict?
References: <guffbh$7do$1@reader1.panix.com>	<mailman.113.1242254593.8015.python-list@python.org>
	<guhepj$frm$1@reader1.panix.com>
	<mailman.158.1242328059.8015.python-list@python.org>
Message-ID: <guhu4u$i38$1@reader1.panix.com>

In <mailman.158.1242328059.8015.python-list at python.org> Dave Angel <davea at ieee.org> writes:



>kj wrote:
>> In <mailman.113.1242254593.8015.python-list at python.org> Terry Reedy <tjreedy at udel.edu> writes:
>>
>>   
>>> kj wrote:
>>>     
>>>> Suppose I have the following:
>>>>
>>>> def foo(x=None, y=None, z=None):
>>>>     d = {"x": x, "y": y, "z": z}
>>>>     return bar(d)
>>>>
>>>> I.e. foo takes a whole bunch of named arguments and ends up calling
>>>> a function bar that takes a single dictionary as argument, and this
>>>> dictionary has the same keys as in foo's signature, so to speak.
>>>>
>>>> Is there some builtin variable that would be the same as the variable
>>>> d, and would thus obviate the need to explicitly bind d?
>>>>       
>>
>>   
>>> Use the built-in function locals()
>>>     
>>>>>> def f(a,b):
>>>>>>           
>>> 	x=locals()
>>> 	print(x)
>>>     
>>
>>   
>>>>>> f(1,2)
>>>>>>           
>>> {'a': 1, 'b': 2}
>>>     
>>
>> That's *exactly* what I was looking for.  Thanks!
>>
>> kynn
>>
>>
>>   
>You already had a better answer from Chris Rebert:

>def foo(**kwargs):
>    return bar(kwargs)

>kwargs at this point is exactly a dictionary of the named arguments to foo.

I disagree.  If I defined foo as you show above, then there is no
error checking on the named parameters passed to foo; anything
goes.

>Because if you try to do anything in this function, you'll probably be 
>adding more local variables. And then they'd be passed to bar as well.

That problem is easily solved: just make "x = locals()" the first
statement in the definition of foo.

kynn
-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From Scott.Daniels at Acm.Org  Thu May 14 16:20:50 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 14 May 2009 13:20:50 -0700
Subject: C API: how to replace python number object in place?
In-Reply-To: <guhk5c$gb2$1@rumours.uwaterloo.ca>
References: <guhk5c$gb2$1@rumours.uwaterloo.ca>
Message-ID: <JrudnVSRisF_5pHXnZ2dnUVZ_rOdnZ2d@pdx.net>

Stephen Vavasis wrote:
> If x is a C variable of type PyObject*, and I happen to know already that 
> the object is of a numeric type, say int, is there a way to change the 
> value of x in place to a different number?  In the C/API documentation I 
> found routines to increment or decrement it in place, but I didn't find a 
> routine to simply replace its value by a different value.  (I suppose I 
> could change it to the new value via an increment or decrement, but this 
> is ugly as well as being susceptible to overflow problems and roundoff 
> errors in the case of floats.)
> 
> Thanks,
> Steve Vavasis
If you do figurte out how to do what you want, you will put us in the
old FORTRAN trap:  People can write code that changes the value of a
constant.
The code:
     month = 12 # make it december
     inches_per_foot = 12
     make_previous(month)
     print ('Month is now: %s, inches_per_foot = %s' % (
                month, inches_per_foot))
might print:
     Month is now: 11, inches_per_foot = 11

--Scott David Daniels
Scott.Daniels at Acm.Org


From tack at urandom.ca  Thu May 14 16:24:56 2009
From: tack at urandom.ca (Jason Tackaberry)
Date: Thu, 14 May 2009 16:24:56 -0400
Subject: How to get all named args in a dict?
In-Reply-To: <guhu4u$i38$1@reader1.panix.com>
References: <guffbh$7do$1@reader1.panix.com>
	<mailman.113.1242254593.8015.python-list@python.org>
	<guhepj$frm$1@reader1.panix.com>
	<mailman.158.1242328059.8015.python-list@python.org>
	<guhu4u$i38$1@reader1.panix.com>
Message-ID: <1242332696.3568.63.camel@arrakis>

On Thu, 2009-05-14 at 20:15 +0000, kj wrote:
> That problem is easily solved: just make "x = locals()" the first
> statement in the definition of foo.

That doesn't solve the problem.  You'd need locals().copy()

Cheers,
Jason.



From socyl at 987jk.com.invalid  Thu May 14 16:26:55 2009
From: socyl at 987jk.com.invalid (kj)
Date: Thu, 14 May 2009 20:26:55 +0000 (UTC)
Subject: Need advice on distributing small module
Message-ID: <guhuqf$h3u$1@reader1.panix.com>




I've written a tiny module that I'd like to make available online
from my website.  This module is not "production-grade" code; it
is meant only as an illustration, but still I'd like to make its
download and installation as painless as possible.

I could simply bundle everything into a .tgz file, but I'd like
the distribution to conform to the expectations of Python users,
as far as the installation sequence is concerned.  I'm fairly new
to Python, and would appreciate your advice on this last point.

The module has only one non-standard dependency, described by the
following code:

if sys.version_info[:2] >= (2, 6):
    import json
else:
    import simplejson as json

If possible, I'd like to make distribution procedure such that if
necessary it also installs json or simplejson (as the case may be).

The actual package would contain the module file and a README file.

Is there a standard tool I can use to create this distribution?

TIA!

kynn
-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From clp2 at rebertia.com  Thu May 14 16:27:41 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 14 May 2009 13:27:41 -0700
Subject: How to get the formal args of a function object?
In-Reply-To: <guhrjb$79i$1@reader1.panix.com>
References: <guhrjb$79i$1@reader1.panix.com>
Message-ID: <50697b2c0905141327j6bd85c79l85bb9ca96181cb60@mail.gmail.com>

On Thu, May 14, 2009 at 12:31 PM, kj <socyl at 987jk.com.invalid> wrote:
>
>
> Suppose that f is an object whose type is 'function'.
>
> Is there a way to find out f's list of formal arguments?
>
> The reason for this is that I'm trying to write a decorator and
> I'd like the wrapper to be able to check the number of arguments
> passed. ?Specifically, I'd like the wrapper to look as shown below:
>
> def _wrap(f):
> ? ?def wrapper(self, *params):
> ? ? ? ?n_expected = len(f.FORMAL_ARGS)
> ? ? ? ?n_received = len(params)
> ? ? ? ?if n_received is not n_expected:
> ? ? ? ? ? ?raise RuntimeError("Wrong number of arguments passed "
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? "to %s" % f.__name__)
> ? ? ? ?return self.send_jsonrpc_request(f.__name__, params)
> ? ?return wrapper
>
> ...but I'm missing something like the hypothetical attribute
> FORMAL_ARGS above.

Take a look at inspect.getargspec(func):
http://docs.python.org/library/inspect.html#inspect.getargspec

Cheers,
Chris
-- 
http://blog.rebertia.com

> --
> NOTE: In my address everything before the first period is backwards;
> and the last period, and everything after it, should be discarded.

P.S. Have you considered making your address obfuscation just slightly
less of a pain in the ass? It's particularly annoying compared to
others'.


From jeff at jmcneil.net  Thu May 14 16:33:55 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Thu, 14 May 2009 13:33:55 -0700 (PDT)
Subject: How to get the formal args of a function object?
References: <guhrjb$79i$1@reader1.panix.com>
Message-ID: <17f96405-c164-4bbb-920d-adbdb54c66a6@o20g2000vbh.googlegroups.com>

You can pull it out of f.func_code.co_varnames, but I don't believe
that's a very good approach. I tend to veer away from code objects
myself.

If you know how many arguments are passed into the wrapped function
when it's defined, you can write a function that returns your
decorator. As an example...

def validate_params(c):
    def the_decorator(f):
        def wrapper(*args):
            if len(args) != c:
                raise Exception("Bad things, Man.")
            return f(*args)
        return wrapper
    return the_decorator

@validate_params(2)
def add(a,b):
    return a+b

add(1,2)
add(1,2,3)

$ ./test.py
Traceback (most recent call last):
  File "test.py", line 16, in <module>
    add(1,2,3)
  File "test.py", line 5, in wrapper
    raise Exception("Bad things, Man.")
Exception: Bad things, Man.

Jeff



On May 14, 3:31?pm, kj <so... at 987jk.com.invalid> wrote:
> Suppose that f is an object whose type is 'function'.
>
> Is there a way to find out f's list of formal arguments?
>
> The reason for this is that I'm trying to write a decorator and
> I'd like the wrapper to be able to check the number of arguments
> passed. ?Specifically, I'd like the wrapper to look as shown below:
>
> def _wrap(f):
> ? ? def wrapper(self, *params):
> ? ? ? ? n_expected = len(f.FORMAL_ARGS)
> ? ? ? ? n_received = len(params)
> ? ? ? ? if n_received is not n_expected:
> ? ? ? ? ? ? raise RuntimeError("Wrong number of arguments passed "
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?"to %s" % f.__name__)
> ? ? ? ? return self.send_jsonrpc_request(f.__name__, params)
> ? ? return wrapper
>
> ...but I'm missing something like the hypothetical attribute
> FORMAL_ARGS above.
>
> TIA!
>
> Kynn
>
> --
> NOTE: In my address everything before the first period is backwards;
> and the last period, and everything after it, should be discarded.



From norseman at hughes.net  Thu May 14 16:40:06 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 13:40:06 -0700
Subject: OS independent file associate ?
In-Reply-To: <4A0C6EE7.3070709@gmail.com>
References: <4A0C6EE7.3070709@gmail.com>
Message-ID: <4A0C81A6.3070107@hughes.net>

Stef Mientki wrote:
> hello,
> 
> I would like to make my programs available under the "standard" OS's, 
> like Windows, Linux  (,Mac)
> One of the problems I encounter, is launching of files through their 
> file associates (probably a windows only terminology ;-)
> Now I can detect the OS, but only the main OS and not e.g. Ubuntu / 
> Gnome or whatever I've to detect.
> Through trial and error I found a working mechanism under Ubuntu, but as 
> I have to specify "gnome", I doubt this will work under other Linux 
> systems.
> 
> any good solutions available ?
> 
> thanks,
> Stef Mientki
> 
>    import subprocess
>    CHM = '../numpy.chm'
> 
>    # works under Ubuntu
>    subprocess.Popen( "gnome-open " + CHM , shell = True )
> 
>    # doesn't work under Ubuntu
>    # (the list should be converted to a number of arguments,
>    #but that doesn't seem to work under Ubuntu.
>    subprocess.Popen( [ "gnome-open" , CHM] ,shell = True )
> 
>    # works under Windows
>    subprocess.Popen( CHM , shell = True )
> 
>    # works better under windows
>    win32help.HtmlHelp ( Win32_Viewer,
>                         str(CHM),
>                         win32help.HH_DISPLAY_INDEX,
>                         str ( keyword ) )
> 
>  
================================

General algorithm  which I have used for years.
Convert to specific syntax of compiler/interpreter/whatever...


Get OS from an OS call       Python has  platform   for that
Get the version              Python has  uname      for that
Get the version              Linux has   uname -a   for that

Pick your OS you use most and put that test first
   if it fails, try 2nd
   it it fails, try 3rd
   .
   .
each try uses the files suited to OS attempted


FYI
import platform
help(platform)
   (read)

os_is= platform.system()
   test for os_is == which



platform.dist()   check the doc - not sure this one does anything useful

platform.uname()  check the doc - Test it on Ubuntu, may be useful



Steve


From Scott.Daniels at Acm.Org  Thu May 14 16:42:16 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 14 May 2009 13:42:16 -0700
Subject: How to get the formal args of a function object?
In-Reply-To: <guhrjb$79i$1@reader1.panix.com>
References: <guhrjb$79i$1@reader1.panix.com>
Message-ID: <E8ednaCLtPh1HZHXnZ2dnUVZ_jOdnZ2d@pdx.net>

kj wrote:
> Suppose that f is an object whose type is 'function'.
> 
> Is there a way to find out f's list of formal arguments?
> 
> The reason for this is that I'm trying to write a decorator and
> I'd like the wrapper to be able to check the number of arguments
> passed....but I'm missing something like the hypothetical attribute
> FORMAL_ARGS above.

I can write a wrapper now:

     def tracer(function):
         def internal(*args, **kwargs):
             print('calling %s(%s)' % (function.__name__,
                     ', '.join([repr(arg) for arg in args] +
                               ['%s=%r' % ka for ka in sorted(kwargs)])))
             result = function(*args, **kwargs)
             print('=> %r' % result)
         return internal

and call like so:
     tracer(math.sin)(3.1415 / 6)

     calling sin(0.5235833333333334)
     => 0.49998662654663256

What would your missing something be for tracer(math.sin)?

--Scott David Daniels
Scott.Daniels at Acm.Org


From gchen9 at gmail.com  Thu May 14 16:45:10 2009
From: gchen9 at gmail.com (guangshan chen)
Date: Thu, 14 May 2009 15:45:10 -0500
Subject: how to import MV module
Message-ID: <9DCDC50A-C057-4A2A-BE20-3F08A6DE5F86@gmail.com>

Hi all,

I am new. I just want to run a python program.

When I run it, python can not find MV module. The follow is the error  
information:
Traceback (most recent call last):
   File "MakeCouplerRestart.py", line 22, in <module>
     import MV,struct,Numeric,string
ImportError: No module named MV

Could any one tell me how to import MV module. Where is it?

Thanks..

Guangshan



From hniksic at xemacs.org  Thu May 14 16:59:29 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Thu, 14 May 2009 22:59:29 +0200
Subject: C API: how to replace python number object in place?
References: <guhk5c$gb2$1@rumours.uwaterloo.ca>
Message-ID: <87eiurbdu6.fsf@busola.homelinux.net>

vavasis at cpu111.math.uwaterloo.ca (Stephen Vavasis) writes:

> If x is a C variable of type PyObject*, and I happen to know already
> that the object is of a numeric type, say int, is there a way to
> change the value of x in place to a different number?  In the C/API
> documentation I found routines to increment or decrement it in
> place, but I didn't find a routine to simply replace its value by a
> different value.

The only thing you can do is change x to point to a different object,
with the new desired value.  That is how the "in place" number
modification functions work.

Which routines to increment or decrement the number are you referring
to, exactly?


From piet at cs.uu.nl  Thu May 14 17:06:54 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Thu, 14 May 2009 23:06:54 +0200
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.29.1242119171.8015.python-list@python.org>
	<043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>
	<83b176cc-dce5-4fb8-a4bb-b9151f59ee9c@z7g2000vbh.googlegroups.com>
Message-ID: <m2eiurjswh.fsf@cs.uu.nl>

>>>>> bearophileHUGS at lycos.com (b) wrote:

>b> Nimrod also seems to ignore underscores inside names, seeing them as
>b> blanks. Some languages ignore underscores inside number literals, but
>b> I have never seen a language ignoring them into names too.

You may not have seen it, but Fortran and Algol 60 belong to that
category. 
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From norseman at hughes.net  Thu May 14 17:15:05 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 14:15:05 -0700
Subject: How to get the formal args of a function object?
In-Reply-To: <guhrjb$79i$1@reader1.panix.com>
References: <guhrjb$79i$1@reader1.panix.com>
Message-ID: <4A0C89D9.3070600@hughes.net>

kj wrote:
> 
> Suppose that f is an object whose type is 'function'.
> 
> Is there a way to find out f's list of formal arguments?
> 
> The reason for this is that I'm trying to write a decorator and
> I'd like the wrapper to be able to check the number of arguments
> passed.  Specifically, I'd like the wrapper to look as shown below:
> 
> def _wrap(f):
>     def wrapper(self, *params):
>         n_expected = len(f.FORMAL_ARGS)
>         n_received = len(params)
>         if n_received is not n_expected:
>             raise RuntimeError("Wrong number of arguments passed "
>                                "to %s" % f.__name__)
>         return self.send_jsonrpc_request(f.__name__, params)
>     return wrapper
> 
> ...but I'm missing something like the hypothetical attribute
> FORMAL_ARGS above.
> 
> TIA!
> 
> Kynn
> 
========================================
I've never tried that approach.  But the attempt brings back memories.

Mind you I was using a compiler, not an interpreter.

Language was assembly

it outlines like this:

1st time called:

compile actual code                       # boo-koo bytes
if token count test OK
   compile the call to the code            # just the call (1 or 2 words)
else
   print current program address
   compile in a string denoting error                "ERROR-ERROR"
    to force a quit (crash)


2nd time and on

do not compile actual code               # Zero bytes
if token count test OK
   compile the call to the code           # just the call (1 or 2 words)
else
   print current program address
   compile in a string denoting error                "ERROR-ERROR"
    to force a quit (crash)

Helps to print the assembly 'prn' file and look for your error flag 
BEFORE trying to run program. :)

compiler token stack (storage) delta before/after packet loaded is
tested with size expected and compiler directives adjusted accordingly.

I have no idea how to do this with an interpreter.  Maybe someone who 
reads this can figure it out.  If so - I want a copy!!!! (Please.)

Even:
def funct_foo(t1,t2,t3):
   call_token_check(3)          will not tell the incoming number
                                they are on a stack or something
                                somewhere else in memory.
With an interpreter this becomes an expensive overhead. Mine was only 
costly at compile time. Not at run time. And it shortened the code and 
the development time.



Steve


From piet at cs.uu.nl  Thu May 14 17:16:05 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Thu, 14 May 2009 23:16:05 +0200
Subject: Distributed locking
References: <7addabf4-2b20-4be2-8d1b-cde6d0a04bb1@a5g2000pre.googlegroups.com>
Message-ID: <m2ab5fjsh6.fsf@cs.uu.nl>

>>>>> James <rent.lupin.road at gmail.com> (J) wrote:

>J> Hey all, I'm looking for suggestions on how to tackle distributed
>J> locking across several Python programs on several different machines.

Have you looked at the multiprocessing package? It has distributed
Locks's with timeouts which might well fit your requirements.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From python-url at phaseit.net  Thu May 14 17:21:15 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Thu, 14 May 2009 21:21:15 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (May 14)
Message-ID: <gui20b$bbq$1@lairds.us>

QOTW:  "Tail recursion *unifies* message passing and function calling.
*This* is the reason tail recursion is cool." - JRM
    http://funcall.blogspot.com/2009/05/you-knew-id-say-something-part-iii.html


    First beta of Python 3.1 released
        http://groups.google.com/group/comp.lang.python/t/29d24e950df2bcc6/

    Python-coded scripts can do what LINQ does in expressing queries as
    SQL against a list of rows and columns:
        http://groups.google.com/group/comp.lang.python/msg/8c67d72703979c55
    SQLite is quite wonderful.
    
    Chaining generators efficiently
        http://groups.google.com/group/comp.lang.python/t/f7503fd51f113976/
    
    Decorating a method is slightly harder than decorating a plain function:
        http://groups.google.com/group/comp.lang.python/t/956ce6027df6f8e4/
    
    heapq.merge() lacks a `key` argument, but it would be very useful:
        http://groups.google.com/group/comp.lang.python/t/52ed18a35654d2b1/
    
    Python syntax as a friendlier alternative to those cryptic functional
    languages
        http://groups.google.com/group/comp.lang.python/t/5f02a42f22e896f3/
    On a third hand, JRM argues that tail recursion would only help
    Python, despite the decisions of BDFL.
	http://funcall.blogspot.com/2009/05/you-knew-id-say-something-part-iii.html
    
    The right way to use an "else" clause in a try/except/else:
        http://groups.google.com/group/comp.lang.python/t/c599b522d4e59f54/
    
    Simple way of handling and logging errors:
        http://groups.google.com/group/comp.lang.python/t/4a77fa363f247f78/
        http://groups.google.com/group/comp.lang.python/t/fd85bc9de4a23713/
    
    Experienced Pythonistas comment on a simple program:
        http://groups.google.com/group/comp.lang.python/t/5ac3a909e38c4ee4/
    
    Serving an image in a web application does not necesarily require a file
    stored on disk:
        http://groups.google.com/group/comp.lang.python/t/721d5e6ab3b1cbd7/
    
    Double-clicking a .py file doesn't work: how to fix file associations
    on Windows
        http://groups.google.com/group/comp.lang.python/t/8837a113342c63bc/
    
    A long thread, started as a request for comments on PEP 382, now
    discussing how evil .pth files are, and other issues involving eggs,
    setuptools, easy _install, distutils and even GNU stow:
        http://groups.google.com/group/comp.lang.python/t/aebfb3311a2f5eb6/
    
    In case you missed it: 'import antigravity' in action!
        http://groups.google.com/group/comp.lang.python/t/9e8d5ebb5423b0af/
    

========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiasts":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.
	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    Enjoy the *Python Magazine*.
	http://pymag.phparch.com/

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
  http://search.gmane.org/?query=python+URL+weekly+news+links&group=gmane.comp.python.general&sort=date
  http://groups.google.com/groups/search?q=Python-URL!+group%3Acomp.lang.python&start=0&scoring=d&
  http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes

There is *not* an RSS for "Python-URL!"--at least not yet.  Arguments
for and against are occasionally entertained.


Suggestions/corrections for next week's posting are always welcome.
E-mail to <Python-URL at phaseit.net> should get through.

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news about posting archives.


From maymunbeyin at gmail.com  Thu May 14 17:38:55 2009
From: maymunbeyin at gmail.com (kk)
Date: Thu, 14 May 2009 14:38:55 -0700 (PDT)
Subject: Returning dictionary from a function
Message-ID: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>

Hi

I am working on something here and I cannot get the full dictionary
out of a function. I am sure I am missing something here.

Anyways here is a simple code that repeats my problem. Basically I am
just trying to get that values function to return the diky as a
dictionary so that I can query values later.

thanks




def values(x):
    diky={}
    for a in range(x):
        a=a+100
        diky={chr(a):a}

        print diky
    return diky


b=values(5)
print type(b),len(b), b['f'] # gives error
print type(b),len(b), b['h'] # does not give error


From gunterhenriksen at gmail.com  Thu May 14 17:40:27 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Thu, 14 May 2009 14:40:27 -0700
Subject: Block-Local Variables using "with"
Message-ID: <ab4fa3490905141440n2cf046b2sf98534e11d05a6f7@mail.gmail.com>

Presuming there is a reason to want block-local variables,
does this seem like a good way to do something like it?

@contextlib.contextmanager
def blocklocal(**kwargs):
    bl = type('', (object,), {})()
    for (k, v) in kwargs.items():
        bl.__setattr__(k, v)
    yield bl
    for k in bl.__dict__.copy():
        bl.__delattr__(k)

with blocklocal(a=12, b="hello") as bl:
    bl.c = "world"
    print(bl.a, bl.b, bl.c)

The "bl" variable would still be there but empty.
Are there cleaner ways? (without nested "def"s)


From norseman at hughes.net  Thu May 14 17:41:24 2009
From: norseman at hughes.net (norseman)
Date: Thu, 14 May 2009 14:41:24 -0700
Subject: How to get the formal args of a function object?
In-Reply-To: <E8ednaCLtPh1HZHXnZ2dnUVZ_jOdnZ2d@pdx.net>
References: <guhrjb$79i$1@reader1.panix.com>
	<E8ednaCLtPh1HZHXnZ2dnUVZ_jOdnZ2d@pdx.net>
Message-ID: <4A0C9004.9070400@hughes.net>

Scott David Daniels wrote:
> kj wrote:
>> Suppose that f is an object whose type is 'function'.
>>
>> Is there a way to find out f's list of formal arguments?
>>
>> The reason for this is that I'm trying to write a decorator and
>> I'd like the wrapper to be able to check the number of arguments
>> passed....but I'm missing something like the hypothetical attribute
>> FORMAL_ARGS above.
> 
> I can write a wrapper now:
> 
>     def tracer(function):
>         def internal(*args, **kwargs):
>             print('calling %s(%s)' % (function.__name__,
>                     ', '.join([repr(arg) for arg in args] +
>                               ['%s=%r' % ka for ka in sorted(kwargs)])))
>             result = function(*args, **kwargs)
>             print('=> %r' % result)
>         return internal
> 
> and call like so:
>     tracer(math.sin)(3.1415 / 6)
> 
>     calling sin(0.5235833333333334)
>     => 0.49998662654663256
> 
> What would your missing something be for tracer(math.sin)?
> 
> --Scott David Daniels
> Scott.Daniels at Acm.Org
=========================
Scott;
I'm lost with this.

If you use the same and add that it prints both the first_token/second 
and the first_token multiplied by second and pass it (pi, 6, 7)  what 
happens then?

ie - function mysin only expects pi and 6 and is to print both pi/6 and 
pi*6.  The 7 is an error, not supposed to be there.



Steve


From maymunbeyin at gmail.com  Thu May 14 17:44:44 2009
From: maymunbeyin at gmail.com (kk)
Date: Thu, 14 May 2009 14:44:44 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
Message-ID: <c846db84-c3a1-41cf-8d27-c7038aa7fe25@o14g2000vbo.googlegroups.com>

Btw my main problem is that when I assign the function to 'b' variable
I only get the last key from the dictionary. Sorry about that I forgot
to mention the main issue.


From tjreedy at udel.edu  Thu May 14 17:51:25 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 14 May 2009 17:51:25 -0400
Subject: introspection question: get return type
In-Reply-To: <guhsvv$cu$1@panix3.panix.com>
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>	<4a0c1a0e$0$31748$426a74cc@news.free.fr>	<%bXOl.15204$Ux.561@tornado.fastwebnet.it>	<4a0c6e42$0$12031$426a74cc@news.free.fr>
	<guhsvv$cu$1@panix3.panix.com>
Message-ID: <gui3ot$vmi$1@ger.gmane.org>

Aahz wrote:
> In article <4a0c6e42$0$12031$426a74cc at news.free.fr>,
> Bruno Desthuilliers  <bdesth.quelquechose at free.quelquepart.fr> wrote:
>> Marco Mariani a ?crit :
>>> Bruno Desthuilliers wrote:
>>>> Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
>>>> sense given Python's dynamic typing.
>>> Unless he's really trying to write in Nohtyp,
>> You meant "Notype" ?-)
> 
> Marco's spelling is correct.

Right. Nohtyp is an abbreviation for Noh-type, which is very traditionalist.

> Try "Nohtyp".reverse()

which give us the anti-traditionalist (Monty) Python style of play.

tjr






From bearophileHUGS at lycos.com  Thu May 14 17:55:10 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 14 May 2009 14:55:10 -0700 (PDT)
Subject: Nimrod programming language
References: <159308160@web.de>
	<mailman.29.1242119171.8015.python-list@python.org> 
	<043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com> 
	<83b176cc-dce5-4fb8-a4bb-b9151f59ee9c@z7g2000vbh.googlegroups.com> 
	<m2eiurjswh.fsf@cs.uu.nl>
Message-ID: <631bec2d-f9ee-47cd-85ef-acdee69a3504@r34g2000vbi.googlegroups.com>

Piet van Oostrum:
> You may not have seen it, but Fortran and Algol 60 belong to that
> category.

I see. It seems my ignorance is unbounded, even for the things I like.
I am very sorry.

Bye,
bearophile


From tjreedy at udel.edu  Thu May 14 17:56:06 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 14 May 2009 17:56:06 -0400
Subject: python copy method alters type
In-Reply-To: <4A0C1722.4050600@gmail.com>
References: <4A0C1722.4050600@gmail.com>
Message-ID: <gui41l$vmi$2@ger.gmane.org>

Zhenhai Zhang wrote:
> Really weired; Here is my code:
> 
>    a = ["a", 1, 3, 4]
>    print "a:", a
>      c = copy(a)

SyntaxError: unexpected indent
If you correct that, you would get a NameError

>    c[0] = "c"
>    c[1] = 2
>    print "c:", c
>    print "a:",a

When posting, copy and paste the complete code that you actually ran to 
get the purported output.



From jeff at jmcneil.net  Thu May 14 18:00:16 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Thu, 14 May 2009 15:00:16 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
	<c846db84-c3a1-41cf-8d27-c7038aa7fe25@o14g2000vbo.googlegroups.com>
Message-ID: <25219b52-9650-40d5-b31b-6bf55e2875be@z5g2000vba.googlegroups.com>

On May 14, 5:44?pm, kk <maymunbe... at gmail.com> wrote:
> Btw my main problem is that when I assign the function to 'b' variable
> I only get the last key from the dictionary. Sorry about that I forgot
> to mention the main issue.


You're creating a new dictionary with each iteration of your loop, use
d[k] = v syntax instead.


From deets at nospam.web.de  Thu May 14 18:01:25 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 15 May 2009 00:01:25 +0200
Subject: Returning dictionary from a function
In-Reply-To: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
Message-ID: <773ilmF1f2uflU1@mid.uni-berlin.de>

kk schrieb:
> Hi
> 
> I am working on something here and I cannot get the full dictionary
> out of a function. I am sure I am missing something here.
> 
> Anyways here is a simple code that repeats my problem. Basically I am
> just trying to get that values function to return the diky as a
> dictionary so that I can query values later.
> 
> thanks
> 
> 
> 
> 
> def values(x):
>     diky={}
>     for a in range(x):
>         a=a+100
>         diky={chr(a):a}
> 
>         print diky
>     return diky
> 
> 
> b=values(5)
> print type(b),len(b), b['f'] # gives error
> print type(b),len(b), b['h'] # does not give error

You are creating a new dictionary over and over.

dikiy[chr(a)] = a

is what you want inside the loop.

Diez


From jenn.duerr at gmail.com  Thu May 14 18:02:13 2009
From: jenn.duerr at gmail.com (noydb)
Date: Thu, 14 May 2009 15:02:13 -0700 (PDT)
Subject: putting date strings in order
References: <dc7e9d9c-5957-45ab-9228-70dafbe46e7a@n4g2000vba.googlegroups.com>
	<guhn01$j0r$03$1@news.t-online.com>
	<UImdnbqCOMOL55HXnZ2dnUVZ_gCdnZ2d@pdx.net>
Message-ID: <b1a0f614-fae0-4b5b-8c14-5b4cf8a6dc73@t11g2000vbc.googlegroups.com>

On May 14, 4:13?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> Peter Otten wrote:
> > Hm, if ordered_raster_list is guaranteed to contain one string item for
> > every month the above can be simplified to
>
> > months = [
> > ? ? 'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr',
> > ? ? 'precip_may', 'precip_jun', 'precip_jul', 'precip_aug',
> > ? ? 'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec']
>
> > start = 2
> > ordered_raster_list = months[start-1:] + months[:start-1]
>
> Or even:
> ?>
> ? ? ?multi_months = [
> ? ? ? ? ?'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr',
> ? ? ? ? ?'precip_may', 'precip_jun', 'precip_jul', 'precip_aug',
> ? ? ? ? ?'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec'] * 2
> ? ? ?start = 2
> ? ? ?ordered_raster_list = multi_months[start - 1: start + 11]
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

Peter and Scott --

ordered_raster_list is guaranteed to have one string item for all 12
months -- it is just NOT guaranteed to have those in chronological
order, which is what is required, whether the data starts in january
(thus ending in dec of same year) or august (thus ending in jul of the
following year) or whenever.  The initial order of the list is
dictated by when the raster (precip_<month>) was added to it's
container.  One would hope the rasters would be added in order, but I
cannot count on that and shouldn't.


From smarden1 at gmail.com  Thu May 14 18:03:43 2009
From: smarden1 at gmail.com (smarden1 at gmail.com)
Date: Thu, 14 May 2009 15:03:43 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
	<c846db84-c3a1-41cf-8d27-c7038aa7fe25@o14g2000vbo.googlegroups.com>
Message-ID: <b207f7a9-91f7-46e2-bd0f-e44a40ba431a@n8g2000vbb.googlegroups.com>

def values(x):
    diky={}
    for a in range(x):
        a=a+100
        diky[chr(a)] = a
    return diky

it is not working b/c you are creating a new dictionary with each
iteration of the loop, rather you want to update the same dictionary
with the new value you have..


From bearophileHUGS at lycos.com  Thu May 14 18:04:20 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 14 May 2009 15:04:20 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
Message-ID: <82799f8e-fe84-426a-b236-44a4b821b652@g19g2000vbi.googlegroups.com>

kk:
>I am sure I am missing something here.<

This instruction created a new dicky dict for every iteration:
diky={chr(a):a}

What you want is to add items to the same dict, that you later output.
The normal way to do it is:
diky[chr(a)] = a

Your fixed code:

def values(x):
    diky = {}
    for i in xrange(x):
        i += 100
        diky[chr(i)] = i
    print diky
    return diky

b = values(5)
print type(b), len(b), b['f']
print type(b), len(b), b['h']

Bye,
bearophile


From google at mrabarnett.plus.com  Thu May 14 18:04:41 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 23:04:41 +0100
Subject: how to import MV module
In-Reply-To: <9DCDC50A-C057-4A2A-BE20-3F08A6DE5F86@gmail.com>
References: <9DCDC50A-C057-4A2A-BE20-3F08A6DE5F86@gmail.com>
Message-ID: <4A0C9579.6030709@mrabarnett.plus.com>

guangshan chen wrote:
> Hi all,
> 
> I am new. I just want to run a python program.
> 
> When I run it, python can not find MV module. The follow is the error 
> information:
> Traceback (most recent call last):
>   File "MakeCouplerRestart.py", line 22, in <module>
>     import MV,struct,Numeric,string
> ImportError: No module named MV
> 
> Could any one tell me how to import MV module. Where is it?
> 
It's not a standard part of Python.

I've Googled for it and I've found a website about climate data
analysis:

http://www2-pcmdi.llnl.gov/

Is that what you're doing?


From google at mrabarnett.plus.com  Thu May 14 18:08:55 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 23:08:55 +0100
Subject: Returning dictionary from a function
In-Reply-To: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
Message-ID: <4A0C9677.2010100@mrabarnett.plus.com>

kk wrote:
> Hi
> 
> I am working on something here and I cannot get the full dictionary
> out of a function. I am sure I am missing something here.
> 
> Anyways here is a simple code that repeats my problem. Basically I am
> just trying to get that values function to return the diky as a
> dictionary so that I can query values later.
> 
> thanks
> 
> 
> 
> 
> def values(x):
>     diky={}
>     for a in range(x):
>         a=a+100
>         diky={chr(a):a}

Here you're discarding the current dict and assigning another to diky.
It think you mean:

         diky[chr(a)] = a

> 
>         print diky

Here you're printing out the entire dict.

>     return diky
> 
> 
> b=values(5)
> print type(b),len(b), b['f'] # gives error
> print type(b),len(b), b['h'] # does not give error



From maymunbeyin at gmail.com  Thu May 14 18:10:46 2009
From: maymunbeyin at gmail.com (kk)
Date: Thu, 14 May 2009 15:10:46 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
	<82799f8e-fe84-426a-b236-44a4b821b652@g19g2000vbi.googlegroups.com>
Message-ID: <cedce272-74cc-4524-b3e5-d716f562ad1f@o30g2000vbc.googlegroups.com>

Hi


Thank you so much. It makes perfect sense. I actually tried the second
suggested syntax before posting here but it was inside of my actual
code which probably had another problem. The suggested solution works
perfectly.

thanks again



From google at mrabarnett.plus.com  Thu May 14 18:13:58 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 14 May 2009 23:13:58 +0100
Subject: Nimrod programming language
In-Reply-To: <631bec2d-f9ee-47cd-85ef-acdee69a3504@r34g2000vbi.googlegroups.com>
References: <159308160@web.de>	<mailman.29.1242119171.8015.python-list@python.org>
	<043b7866-9da6-40eb-9c51-4fc31dfc27d4@r13g2000vbr.googlegroups.com>
	<83b176cc-dce5-4fb8-a4bb-b9151f59ee9c@z7g2000vbh.googlegroups.com>
	<m2eiurjswh.fsf@cs.uu.nl>
	<631bec2d-f9ee-47cd-85ef-acdee69a3504@r34g2000vbi.googlegroups.com>
Message-ID: <4A0C97A6.9030301@mrabarnett.plus.com>

bearophileHUGS at lycos.com wrote:
> Piet van Oostrum:
>> You may not have seen it, but Fortran and Algol 60 belong to that
>> category.
> 
> I see. It seems my ignorance is unbounded, even for the things I like.
> I am very sorry.
> 
Some early versions of Basic were also flexible when it came to spaces.
The example I remember is:

     FORD=STOP

Variable name were a single letter, optionally followed by a digit, so
that's:

     FOR D = S TO P


From mgedmin at gmail.com  Thu May 14 18:15:23 2009
From: mgedmin at gmail.com (Marius Gedminas)
Date: Thu, 14 May 2009 15:15:23 -0700 (PDT)
Subject: Q's on my first python script
References: <gu6im5$1hi$1@reader1.panix.com>
	<slrnh0fpu5.qcl.nick@irishsea.home.craig-wood.com>
Message-ID: <7daf793f-a411-4dee-967c-30c180e91bb2@s20g2000vbp.googlegroups.com>

On May 11, 12:30?pm, Nick Craig-Wood <n... at craig-wood.com> wrote:
> ? ? def __init__(self):
> ? ? ? ? usage = '''Usage: %prog [options] YYMMDD
> ? ? ? ? ? ?%prog -h|--help
> '''
> ? ? ? ? parser = OptionParser(usage=usage)
> ? ? ? ? parser.add_option("-n", "--no-newline", dest="nonl",
> ? ? ? ? ? ? ? ? ? ? ? ? ? action="store_true", help="omit newline in output")
> ? ? ? ? (options, args) = parser.parse_args();
> ? ? ? ? try:
> ? ? ? ? ? ? weekday = self.wkday_abbrev(args[0])
> ? ? ? ? except BadDateString, e:
> ? ? ? ? ? ? print usage
> ? ? ? ? ? ? print e
> ? ? ? ? ? ? sys.exit(1)

I would recommend printing error messages to sys.stderr.

BTW, in this particular case you may want to use

             parser.error(e)

instead of print + sys.exit.

--
Marius Gedminas


From mgedmin at gmail.com  Thu May 14 18:18:54 2009
From: mgedmin at gmail.com (Marius Gedminas)
Date: Thu, 14 May 2009 15:18:54 -0700 (PDT)
Subject: Q's on my first python script
References: <gu6im5$1hi$1@reader1.panix.com>
	<0216ec41$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <eda22636-4843-42f5-acc6-0e487f1b5f34@e23g2000vbe.googlegroups.com>

On May 10, 6:56?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> > 4. What's the python way to emit warnings? ?(The script below should
> > ? ?warn the user that arguments after the first one are ignored.)
>
> import warnings
> warnings.warn("The end of the world is coming!")

The warnings module is used for warnings about program code, not user
input.

import logging
logging.warn("Oh noes, you passed me two arguments instead of one!")

--
Marius Gedminas


From gchen9 at gmail.com  Thu May 14 18:23:20 2009
From: gchen9 at gmail.com (guangshan chen)
Date: Thu, 14 May 2009 17:23:20 -0500
Subject: how to import MV module
In-Reply-To: <4A0C9579.6030709@mrabarnett.plus.com>
References: <9DCDC50A-C057-4A2A-BE20-3F08A6DE5F86@gmail.com>
	<4A0C9579.6030709@mrabarnett.plus.com>
Message-ID: <876A68CE-604E-48E0-869D-F7A5C1410DCB@gmail.com>

Hi MRAB,

Thanks. That is not what I am doing.
It seems only there is MV module used. I also googled a lot.

I just try to delete MV in the program. I found the program still can  
be run without any problem.
So maybe the MV module is not used.

Guangshan

On May 14, 2009, at 5:04 PM, MRAB wrote:

> guangshan chen wrote:
>> Hi all,
>> I am new. I just want to run a python program.
>> When I run it, python can not find MV module. The follow is the  
>> error information:
>> Traceback (most recent call last):
>>   File "MakeCouplerRestart.py", line 22, in <module>
>>     import MV,struct,Numeric,string
>> ImportError: No module named MV
>> Could any one tell me how to import MV module. Where is it?
> It's not a standard part of Python.
>
> I've Googled for it and I've found a website about climate data
> analysis:
>
> http://www2-pcmdi.llnl.gov/
>
> Is that what you're doing?
> -- 
> http://mail.python.org/mailman/listinfo/python-list



From sjmachin at lexicon.net  Thu May 14 18:24:52 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 14 May 2009 15:24:52 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
Message-ID: <bb03595e-5c70-4fbc-87f4-abfd4e1d281b@g22g2000pra.googlegroups.com>

On May 15, 7:38?am, kk <maymunbe... at gmail.com> wrote:
> Hi
>
> I am working on something here and I cannot get the full dictionary
> out of a function. I am sure I am missing something here.
>
> Anyways here is a simple code that repeats my problem. Basically I am
> just trying to get that values function to return the diky as a
> dictionary so that I can query values later.
>
> thanks
>
> def values(x):
> ? ? diky={}
> ? ? for a in range(x):
> ? ? ? ? a=a+100

And you have a SECOND problem ... rebinding your loop counter is
likely to confuse anybody (including yourself!) who tries to
understand (let alone maintain!) your code. If you want a to have
values 0, 100, 200, 300, 400 as the loop is traversed, you should use

   for a in range(0, 500, 100):

or maybe you want 100, ...., 104 which would be produced by
EITHER
   for a in range(100, 105):
OR
   for c in range(5):
       a = c + 100

> ? ? ? ? diky={chr(a):a}

Note that chr(a) will cause an exception when a >= 256 ... do you need
unichr()?

AND what is the point of this dicky diky anyway? Have you considered
the ord() function?

>
> ? ? ? ? print diky
> ? ? return diky
>
> b=values(5)
> print type(b),len(b), b['f'] # gives error
> print type(b),len(b), b['h'] # does not give error

As expected; the last value of a was 104 and ord('h') == 104 ...

HTH,
John


From suruti94 at gmail.com  Thu May 14 18:34:07 2009
From: suruti94 at gmail.com (Mohan Parthasarathy)
Date: Thu, 14 May 2009 15:34:07 -0700
Subject: Circular relationship: object - type
Message-ID: <89dd3da60905141534h339d361ao6171c164c3e7251b@mail.gmail.com>

Hi,

I have read several articles and emails:

http://www.cafepy.com/article/python_types_and_objects/python_types_and_objects.html#relationships-transitivity-figure
http://mail.python.org/pipermail/python-list/2007-February/600128.html

 I understand how type serves to be the default metaclass when an object is
created and it also can be changed. I also read a few examples on why this
metaclass can be a powerful concept. What I fail to understand is the
circular relationship between object and type. Why does type have to be
subclassed from object ? Just to make "Everything is an object and all
objects are  inherited from object class".

Why can't just type be the class from which object class is instantiated ?
Why does it have to be a subclass of object also ?

Sorry if this has been answered before.

Thanks in advance,
mohan
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From trevor.lango at gmail.com  Thu May 14 18:35:23 2009
From: trevor.lango at gmail.com (Trevor)
Date: Thu, 14 May 2009 15:35:23 -0700 (PDT)
Subject: py2exe + win32com + DAO
References: <30bcf41a-f6fe-4580-9735-888fbef419f1@v23g2000pro.googlegroups.com>
	<mailman.66.1242174861.8015.python-list@python.org>
	<9035670f-9057-4f3d-bfbb-5d693d030f62@y6g2000prf.googlegroups.com>
	<mailman.74.1242194642.8015.python-list@python.org>
Message-ID: <275f5c0b-8152-4cf9-b379-abcfaa455bdb@x31g2000prc.googlegroups.com>

I think the problem I am experiencing bears a resemblance to the
content of this post:

http://mail.python.org/pipermail/python-list/2001-February/071421.html

Does anyone know what the GUID for the DAO 3.6 library is (or can
explain how I can find it)?

On May 12, 11:00?pm, David Lyon <david.l... at preisshare.net> wrote:
> On Tue, 12 May 2009 22:06:42 -0700 (PDT), Trevor <trevor.la... at gmail.com>
> wrote:
>
> > I do not believe your assertion applies to the following line of code:
>
> > daoEngine = win32com.client.Dispatch(r'DAO.DBEngine.36')
>
> It doesn't. I'm simply suggesting that it is possible you are opening
> the database in Access or something in Administrator/dba mode. That
> could be causing an exclusive lock on the database so that no sub
> task can then open it.
>
> i have seen this on old versions of Access.
>
> To provide excellent performance, microsoft used to load the whole
> database into memory if it could. And just operate mostly from there.
>
> > is it possible to obtain more
> > verbose error output from Python modules? ?The error message in the
> > original post was generated from:
>
> > print sys.exc_info()[0]
>
> possibly but i'm not sure how...
>
> David



From maymunbeyin at gmail.com  Thu May 14 18:44:17 2009
From: maymunbeyin at gmail.com (kk)
Date: Thu, 14 May 2009 15:44:17 -0700 (PDT)
Subject: Returning dictionary from a function
References: <ff0830e4-40c9-4bcf-a6f5-7c0e649d7ed2@o14g2000vbo.googlegroups.com>
	<bb03595e-5c70-4fbc-87f4-abfd4e1d281b@g22g2000pra.googlegroups.com>
Message-ID: <bd50daf8-aa15-4e57-975b-364d392ddd0e@z5g2000vba.googlegroups.com>

John,

Thanks for pointing out the loop issue. I just typed these sloppy
lines the demonstrate the issue, they were not part of any code by any
means.  I will make sure that I will post cleaner lines next time.


From tomf.sessile at gmail.com  Thu May 14 19:01:31 2009
From: tomf.sessile at gmail.com (TomF)
Date: Thu, 14 May 2009 16:01:31 -0700
Subject: Python system with exemplary organization/coding style
Message-ID: <2009051416013116807-tomfsessile@gmailcom>

I'm looking for a medium-sized Python system with very good coding 
style and good code organization, so I can learn from it.  I'm reading 
various books on Python with advice on such things but I'd prefer to 
see a real system.

By medium-sized I mean 5-20 classes, 5-20 files, etc; a code base that 
has some complexity but isn't overwhelming.

Thanks,
-Tom



From debatem1 at gmail.com  Thu May 14 19:18:07 2009
From: debatem1 at gmail.com (CTO)
Date: Thu, 14 May 2009 16:18:07 -0700 (PDT)
Subject: Python system with exemplary organization/coding style
References: <2009051416013116807-tomfsessile@gmailcom>
Message-ID: <fe6abf21-c0ed-426f-b837-0149f4f86858@e20g2000vbc.googlegroups.com>

On May 14, 7:01?pm, TomF <tomf.sess... at gmail.com> wrote:
> I'm looking for a medium-sized Python system with very good coding
> style and good code organization, so I can learn from it. ?I'm reading
> various books on Python with advice on such things but I'd prefer to
> see a real system.
>
> By medium-sized I mean 5-20 classes, 5-20 files, etc; a code base that
> has some complexity but isn't overwhelming.
>
> Thanks,
> -Tom

I'd recommend screenlets. Good documentation and pretty good style,
and
they have some external dependencies so you can see how that operates,
and of course you can see what your code is and isn't doing pretty
quickly.

<URL: http://www.screenlets.org>

Geremy Condra


From benjumanji at googlemail.com  Thu May 14 19:24:49 2009
From: benjumanji at googlemail.com (Benjamin Edwards)
Date: Thu, 14 May 2009 16:24:49 -0700 (PDT)
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com> 
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com> 
	<98ea5010-2eab-43de-b5a2-d4f79a06f25e@z19g2000vbz.googlegroups.com> 
	<50902c22-df00-4fb8-bc7b-1f596387ea32@j12g2000vbl.googlegroups.com>
Message-ID: <21ff6d85-3c25-4526-b49d-3525dce15497@z7g2000vbh.googlegroups.com>

On May 13, 8:27?pm, CTO <debat... at gmail.com> wrote:
> On May 13, 8:19?am, bearophileH... at lycos.com wrote:
>
> > godshorse, you may use the "shortestPaths" method of this graph class
> > of mine:http://sourceforge.net/projects/pynetwork/
>
> > (It uses the same Dijkstra code by Eppstein).
> > (Once you have all distances from a node to the other ones, it's not
> > too much difficult to find the tree you talk about).
>
> > Also see the Minimum spanning tree:http://en.wikipedia.org/wiki/Minimum_spanning_tree
>
> > Bye,
> > bearophile
>
> Let me add a caution to what bearophile says here- a minimum spanning
> tree minimizes
> the weight of the *whole tree*, not the individual paths in that tree,
> which seems
> to be what you're going after. Those can be pretty different things.
>
> Geremy Condra

no love for floyds algorithm. so simple :D

http://en.wikipedia.org/wiki/Floyd-Warshall_algorithm


From google at mrabarnett.plus.com  Thu May 14 19:32:02 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 15 May 2009 00:32:02 +0100
Subject: how to import MV module
In-Reply-To: <876A68CE-604E-48E0-869D-F7A5C1410DCB@gmail.com>
References: <9DCDC50A-C057-4A2A-BE20-3F08A6DE5F86@gmail.com>
	<4A0C9579.6030709@mrabarnett.plus.com>
	<876A68CE-604E-48E0-869D-F7A5C1410DCB@gmail.com>
Message-ID: <4A0CA9F2.6070002@mrabarnett.plus.com>

guangshan chen wrote:
> Hi MRAB,
> 
> Thanks. That is not what I am doing.
> It seems only there is MV module used. I also googled a lot.
> 
> I just try to delete MV in the program. I found the program still can be 
> run without any problem.
> So maybe the MV module is not used.
> 
 From the trackback I can see that the module is imported as just "MV",
so if the module is actually being used then "MV" will occur elsewhere
in the program. If it doesn't, then deleting it from that line won't be
a problem, but if it _is_ used elsewhere, then it _will_ be a problem -
and it's just that it hasn't happened yet! :-)

> Guangshan
> 
> On May 14, 2009, at 5:04 PM, MRAB wrote:
> 
>> guangshan chen wrote:
>>> Hi all,
>>> I am new. I just want to run a python program.
>>> When I run it, python can not find MV module. The follow is the error 
>>> information:
>>> Traceback (most recent call last):
>>>   File "MakeCouplerRestart.py", line 22, in <module>
>>>     import MV,struct,Numeric,string
>>> ImportError: No module named MV
>>> Could any one tell me how to import MV module. Where is it?
>> It's not a standard part of Python.
>>
>> I've Googled for it and I've found a website about climate data
>> analysis:
>>
>> http://www2-pcmdi.llnl.gov/
>>
>> Is that what you're doing?
 >



From warhammer1805 at gmail.com  Thu May 14 19:34:01 2009
From: warhammer1805 at gmail.com (Andrew Chung)
Date: Thu, 14 May 2009 16:34:01 -0700
Subject: New to python, can i ask for a little help?
In-Reply-To: <50697b2c0905131358q1399019bsa5417335a19af1a5@mail.gmail.com>
References: <bee7c084-4853-4772-b9ea-a84a1ab7cd74@k19g2000prh.googlegroups.com>
	<mailman.72.1242188827.8015.python-list@python.org>
	<5638a6de-d07e-48a0-be73-37d81a2ba6cc@y33g2000prg.googlegroups.com>
	<50697b2c0905131358q1399019bsa5417335a19af1a5@mail.gmail.com>
Message-ID: <8bd3c48b0905141634t1cf5469cu36b6f04f141b51e9@mail.gmail.com>

Thank you to all who responded. You were right about the solution. That
helped alot. Now maybe i can ask if anyone has any ideas for learning, such
as websites or videos. I found one that i liked alot.

http://iamar.net/subpages/PythonVid.html

But i wondered how other people learned as beginners in the past?
Again, thank you to all of you who responded so quickly to my question. It
helped alot.

Andrew

On Wed, May 13, 2009 at 1:58 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Wed, May 13, 2009 at 12:22 PM, warhammer1805 at gmail.com
> <warhammer1805 at gmail.com> wrote:
> > On May 12, 9:27 pm, Chris Rebert <c... at rebertia.com> wrote:
> >> On Tue, May 12, 2009 at 9:18 PM, warhammer1... at gmail.com
> >>
> >>
> >>
> >> <warhammer1... at gmail.com> wrote:
> >> > I loaded python 3.1
> >> > I can use the gui and i see the following:
> >>
> >> > Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> >> > (Intel)] on win32
> >> > Type "copyright", "credits" or "license()" for more information.
> >>
> >> > It would seem that this is working correctly and there is no path
> >> > problem.
> >> > I am running windows vista.
> >>
> >> > When i put in a test string i see this:
> >>
> >> > Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit
> >> > (Intel)] on win32
> >> > Type "copyright", "credits" or "license()" for more information.
> >> >>>> print "hello world!"
> >> > SyntaxError: invalid syntax (<pyshell#0>, line 1)
> >>
> >> > Can anyone tell me what is wrong? I didnt expect that error....
> >>
> >> The print-statement was removed in Python 3.0. Now it's just a
> >> function. You'll have to use:
> >>
> >> print("hello world!")
> >>
> >> instead.
> >>
> >> Please also read the 3.0 transition docs:
> http://docs.python.org/3.0/whatsnew/3.0.html
> >> Note that Python 3.0 differs significantly from Python 2.x
> >>
> >> Cheers,
> >> Chris
> >> --http://blog.rebertia.com
> >
> > Hi Chris,
> > Thank you for the pointer! that sure helped alot.
> > Do you think i should be using a different version of python? I dont
> > normally do much programming. I used to do some C along time ago. I
> > want to get into something again and python seems to be popular.
>
> You should probably use Python v2.6 instead for the time being; most
> libraries have yet to be ported to Python 3.0, so 2.6 has many more
> libraries available for it currently. Python 3.0 is also mostly the
> same as 2.6, so learning 2.6 won't be a waste of time and will help
> you when the full transition to 3.0 is eventually made.
>
> > Could you also tell me who uses python in IT areas? I see alot of
> > python and Mysql. And i see python developer jobs as standalone too.
>
> See http://www.python.org/about/apps/ and
> http://www.python.org/about/success/
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>
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From wescpy at gmail.com  Thu May 14 19:35:08 2009
From: wescpy at gmail.com (wesley chun)
Date: Thu, 14 May 2009 16:35:08 -0700
Subject: [ANN] Introduction to Python course, San Francisco, Jun 2009
In-Reply-To: <78b3a9580904091545w1550330an3e6f06f91f0a4509@mail.gmail.com>
References: <78b3a9580904091545w1550330an3e6f06f91f0a4509@mail.gmail.com>
Message-ID: <78b3a9580905141635x382f0284u9e69a0917d4d291b@mail.gmail.com>

* FINAL REMINDER *

we have about 10-15 spaces remaining for our June course coming up in
about a month. if you have coworkers or colleagues that need to learn
Python, the weather is great up here in northern california in the
city by the bay.

there are discounts for students and teachers, as well as for
companies sending more than one attendee. finally, in this economic
crisis, if you can show you've been laidoff and collecting
unemployment, we can offer you financial aid as well.

the course will NOT be cancelled so you can make your travel
arrangements as well. hope to see you in class!

cheers,
-wesley


On Thu, Apr 9, 2009 at 3:45 PM, wesley chun <wescpy at gmail.com> wrote:
> Need to get up-to-speed with Python as quickly as possible? Come join
> me, Wesley Chun, author of Prentice-Hall's bestseller "Core Python
> Programming," for a comprehensive intro course coming up this June in
> beautiful Northern California! Please pass on this note to whomever
> you think may be interested. I look forward to meeting you and your
> colleagues!
>
> (Comprehensive) Introduction to Python
> Mon-Wed, 2009 Jun 15-17, 9am-5pm
>
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> (COMPREHENSIVE) INTRODUCTION TO PYTHON
>
> Although this course may appear to those new to Python, it is also
> perfect for those who have tinkered with it and want to "fill in the
> gaps" and/or want to get more in-depth formal training. ?It combines
> the best of both an introduction to the language as well as a "Python
> Internals" training course.
>
> We will immerse you in the world of Python in only a few days, showing
> you more than just its syntax (which you don't really need a book to
> learn, right?). Knowing more about how Python works under the covers,
> including the relationship between data objects and memory management,
> will make you a much more effective Python programmer coming out of
> the gate. 3 hands-on labs each day will help hammer the concepts home.
>
> Come find out why Google, Yahoo!, Disney, ILM/LucasFilm, VMware, NASA,
> Ubuntu, YouTube, Slide, and Red Hat all use Python. Users supporting
> or jumping to Plone, Zope, TurboGears, Pylons, Django, Google App
> Engine, Jython, IronPython, and Mailman will also benefit!
>
> FREE PREVIEW 1: you will find (and can download) a video clip of a
> live lesson that was delivered recently to get an idea of the lecture
> style and interactive classroom environment at:
>
> http://cyberwebconsulting.com (click "Python Training")
>
> FREE PREVIEW 2: Partnering with O'Reilly and Pearson, Safari Books
> Online has asked me to deliver a 1-hour webcast on Wednesday morning
> 2009 Apr 29 @ 10:30a PDT/1:30p EDT called <B><I>What is
> Python?</I></B>. This will be an online seminar based on a session
> that I've delivered at numerous conferences in the past. It will give
> you an idea of lecture style as well as an overview of the material
> covered in the course. Plus the first 10 registrants will receive an
> autographed copy of <B><I>Core Python Programming</I></B>! For more
> information:
>
> http://www.safaribooksonline.com/events/WhatIsPython.html
>
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
>
> WHERE: near the San Francisco Airport (SFO/San Bruno), CA, USA
>
> WEB: ? http://cyberwebconsulting.com (click "Python Training")
>
> FLYER: http://starship.python.net/crew/wesc/flyerPP1jun09.pdf
>
> LOCALS: easy freeway (101/280/380) with lots of parking plus public
> transit (BART and CalTrain) access via the San Bruno stations, easily
> accessible from all parts of the Bay Area
>
> VISITORS: free shuttle to/from the airport, free high-speed internet,
> free breakfast and regular evening receptions; fully-equipped suites
>
> See website for costs, venue info, and registration. ?Discounts are
> available for multiple registrations as well as for teachers/students.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
"Core Python Programming", Prentice Hall, (c)2007,2001
"Python Fundamentals", Prentice Hall, (c)2009
    http://corepython.com

"Python Web Development with Django", Addison Wesley, (c) 2009
http://withdjango.com

wesley.j.chun :: wescpy-at-gmail.com
python training and technical consulting
cyberweb.consulting : silicon valley, ca
http://cyberwebconsulting.com


From Scott.Daniels at Acm.Org  Thu May 14 19:43:21 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 14 May 2009 16:43:21 -0700
Subject: How to get the formal args of a function object?
In-Reply-To: <mailman.166.1242337262.8015.python-list@python.org>
References: <guhrjb$79i$1@reader1.panix.com>	<E8ednaCLtPh1HZHXnZ2dnUVZ_jOdnZ2d@pdx.net>
	<mailman.166.1242337262.8015.python-list@python.org>
Message-ID: <CKKdnflL2YTENpHXnZ2dnUVZ_iydnZ2d@pdx.net>

norseman wrote:
> Scott David Daniels wrote:
>> kj wrote:
>>> Suppose that f is an object whose type is 'function'.
>>> Is there a way to find out f's list of formal arguments?...
>>
>> I can write a wrapper now:
>>     def tracer(function):
>>         def internal(*args, **kwargs):
>>             print('calling %s(%s)' % (function.__name__,
>>                     ', '.join([repr(arg) for arg in args] +
>>                               ['%s=%r' % ka for ka in sorted(kwargs)])))
>>             result = function(*args, **kwargs)
>>             print('=> %r' % result)
>>         return internal
>> and call like so:
>>     >>>tracer(math.sin)(3.1415 / 6)
>>     calling sin(0.5235833333333334)
>>     => 0.49998662654663256
>> What would your missing something be for tracer(math.sin)?
> Scott;
> I'm lost with this.

Sorry, I was too telegraphic.  I was pointing out that my wrapper
function (and, indeed, lots of Python code) does something and
passes along whatever args it got.  It's obvious tracer takes a
single arg, but, tracer(math.sin) takes a single arg, while
tracer(math.atan2) takes two args.  If what your code gets is
one of these wrapped functions, it will be tricky to figure out
what the eventual arg list needed will be.

--Scott David Daniels
Scott.Daniels at Acm.Org


From rhodri at wildebst.demon.co.uk  Thu May 14 19:44:09 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 15 May 2009 00:44:09 +0100
Subject: Odd list behavior
In-Reply-To: <4A0C4B9D.20301@hughes.net>
References: <4A0B40E0.2060600@gmail.com> <4A0B44DA.2040107@hughes.net>
	<op.utv27casa8ncjz@gnudebst> <4A0C4B9D.20301@hughes.net>
Message-ID: <op.utx1jvbda8ncjz@gnudebst>

On Thu, 14 May 2009 17:49:33 +0100, norseman <norseman at hughes.net> wrote:

> Rhodri James wrote:
>> On Wed, 13 May 2009 23:08:26 +0100, norseman <norseman at hughes.net>  
>> wrote:
>>
>>> Evan Kroske wrote:
>>>> I'm working on a simple file processing utility, and I encountered a  
>>>> weird error. If I try to get the first element of a list I'm  
>>>> splitting from a string, I get an error:
>>>>  key = string.split()[0]
>>>> Error!
>>>>  However, I can slice the list like normal, but that gives me a  
>>>> one-element-long list:
>>>>  key = string.split()[:1]
>>>> Success!
>>>>  Finally, the operation works perfectly if I initialize the list  
>>>> beforehand:
>>>>  list = string.split()
>>>> key = list[0]
>>>> Success!
>>>>  Why does this happen?
>>
>>>
>>> ==========================
>>> Take a look at the  split() command.
>>>
>>> I think you will find you need one var on the left side for each piece  
>>> on the right.
>>  Given that he's immediately indexing the split results, that's  
>> irrelevant.
>> There's no point in even guessing with out the traceback.
>>

> "...the first element of a list..."
> "key = string.split()[0]"
> if the list is a list of tuples the error message is correct.

What error message?  The OP still hasn't told us what error he got.

In any case, you aren't correct.  First, the str.split() method
returns a list of strings, so there are no tuples in sight.  Second,
even if it did, all that means is that "key" is a tuple, which it's
perfectly well allowed to be.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From sjmachin at lexicon.net  Thu May 14 19:48:08 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 14 May 2009 16:48:08 -0700 (PDT)
Subject: How to get all named args in a dict?
References: <guffbh$7do$1@reader1.panix.com>
	<mailman.113.1242254593.8015.python-list@python.org> 
	<guhepj$frm$1@reader1.panix.com>
	<mailman.158.1242328059.8015.python-list@python.org> 
	<guhu4u$i38$1@reader1.panix.com>
	<mailman.160.1242333295.8015.python-list@python.org>
Message-ID: <02645689-2ed2-4b51-b986-b356d6e9ed9a@j18g2000prm.googlegroups.com>

On May 15, 6:24?am, Jason Tackaberry <t... at urandom.ca> wrote:
> On Thu, 2009-05-14 at 20:15 +0000, kj wrote:
> > That problem is easily solved: just make "x = locals()" the first
> > statement in the definition of foo.
>
> That doesn't solve the problem. ?You'd need locals().copy()

Dave's solution doesn't formally solve the problem because x is the
first arg of foo and re-binding x to locals() is not a good idea if
you need to use the passed-in args before calling bar().

Adding .copy() is necessary only if for some weird reason you want to
call locals() *again* before calling bar().

| >>> def foo(x=None, y=None, z=None):
| ...     d = locals()
| ...     print d
| ...     p = 100
| ...     print d
| ...     print locals()
| ...     print d
| ...
| >>> foo(1,2,3)
| {'y': 2, 'x': 1, 'z': 3}
| {'y': 2, 'x': 1, 'z': 3}
| {'y': 2, 'x': 1, 'z': 3, 'd': {...}, 'p': 100}
| {'y': 2, 'x': 1, 'z': 3, 'd': {...}, 'p': 100}
| >>>

Bonus: not only a side-effect, but a recursive one.

Like the manual says, _*UPDATE*_ and return a dictionary ...

HTH,
John


From davea at ieee.org  Thu May 14 20:46:49 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 14 May 2009 20:46:49 -0400
Subject: How to get all named args in a dict?
In-Reply-To: <guhu4u$i38$1@reader1.panix.com>
References: <guffbh$7do$1@reader1.panix.com>	<mailman.113.1242254593.8015.python-list@python.org>	<guhepj$frm$1@reader1.panix.com>	<mailman.158.1242328059.8015.python-list@python.org>
	<guhu4u$i38$1@reader1.panix.com>
Message-ID: <4A0CBB79.3080105@ieee.org>

kj wrote:
> In <mailman.158.1242328059.8015.python-list at python.org> Dave Angel <davea at ieee.org> writes:
>
>
>
>   
>> kj wrote:
>>     
>>> In <mailman.113.1242254593.8015.python-list at python.org> Terry Reedy <tjreedy at udel.edu> writes:
>>>
>>>   
>>>       
>>>> kj wrote:
>>>>     
>>>>         
>>>>> Suppose I have the following:
>>>>>
>>>>> def foo(x=None, y=None, z=None):
>>>>>     d = {"x": x, "y": y, "z": z}
>>>>>     return bar(d)
>>>>>
>>>>> I.e. foo takes a whole bunch of named arguments and ends up calling
>>>>> a function bar that takes a single dictionary as argument, and this
>>>>> dictionary has the same keys as in foo's signature, so to speak.
>>>>>
>>>>> Is there some builtin variable that would be the same as the variable
>>>>> d, and would thus obviate the need to explicitly bind d?
>>>>>       
>>>>>           
>>>   
>>>       
>>>> Use the built-in function locals()
>>>>     
>>>>         
>>>>>>> def f(a,b):
>>>>>>>           
>>>>>>>               
>>>> 	x=locals()
>>>> 	print(x)
>>>>     
>>>>         
>>>   
>>>       
>>>>>>> f(1,2)
>>>>>>>           
>>>>>>>               
>>>> {'a': 1, 'b': 2}
>>>>     
>>>>         
>>> That's *exactly* what I was looking for.  Thanks!
>>>
>>> kynn
>>>
>>>
>>>   
>>>       
>> You already had a better answer from Chris Rebert:
>>     
>
>   
>> def foo(**kwargs):
>>    return bar(kwargs)
>>     
>
>   
>> kwargs at this point is exactly a dictionary of the named arguments to foo.
>>     
>
> I disagree.  If I defined foo as you show above, then there is no
> error checking on the named parameters passed to foo; anything
> goes.
>
>   
>> Because if you try to do anything in this function, you'll probably be 
>> adding more local variables. And then they'd be passed to bar as well.
>>     
>
> That problem is easily solved: just make "x = locals()" the first
> statement in the definition of foo.
>
> kynn
>   
Well, you caught me by surprise.  The name and number of locals is 
determined at compile time, not at run time.  But when I run an 
experiment, it seems you're right, that the dict changes as the function 
executes.

In Python 2.62 at least, the following function gives the following results:

def myfunc(x, y):
    print  locals()
    s = 42
    print locals()

myfunc(y=12, x=33)

{'y': 12, 'x': 33}
{'y': 12, 'x': 33, 's': 42, 'r': {'y': 12, 'x': 33}}
{'y': 12, 'x': 33}


So, if one wanted to call bar, but not till after one had defined new 
locals, you could do the following:

def foo(x=None, y=None, z=None):
     args = locals().copy()
     a = new stuff
     dosomestuff with a, and maybe y
     bar(args)

A shallow copy would be adequate in this case.

Thanks for the correction.


From pavlovevidence at gmail.com  Thu May 14 21:00:26 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 14 May 2009 18:00:26 -0700 (PDT)
Subject: Need advice on distributing small module
References: <guhuqf$h3u$1@reader1.panix.com>
Message-ID: <99246143-a853-4041-bc45-eeb648388cc4@r3g2000vbp.googlegroups.com>

On May 14, 1:26?pm, kj <so... at 987jk.com.invalid> wrote:
> I've written a tiny module that I'd like to make available online
> from my website. ?This module is not "production-grade" code; it
> is meant only as an illustration, but still I'd like to make its
> download and installation as painless as possible.
>
> I could simply bundle everything into a .tgz file, but I'd like
> the distribution to conform to the expectations of Python users,
> as far as the installation sequence is concerned. ?I'm fairly new
> to Python, and would appreciate your advice on this last point.

First of all, if it's just a single module, I recommend that one of
the options is to allow the file to be downloaded as-is, with no
packaging, because a lot of Python users would find it least
cumbersome to simply drop the file right into the site-packages
directory.  The README file would be a separate download or just a
page on the website.

For more official-looking packages, you want to create a setup.py file
that lists your module's build information and meta-information.  Read
the section of the Python documentation entitled "Distributing Python
Modules" for information on how to write a setup file.  Once you write
it, you can run python setup.py sdist and it'll build a distrribution
for you.


> The module has only one non-standard dependency, described by the
> following code:
>
> if sys.version_info[:2] >= (2, 6):
> ? ? import json
> else:
> ? ? import simplejson as json
>
> If possible, I'd like to make distribution procedure such that if
> necessary it also installs json or simplejson (as the case may be).

Next recommendation: just tell your users to download and install json
if they want to use the module.  A small demo module shouldn't be
taking the initiative to install a fairly large package on the user's
behalf.

Furthermore, some users have extreme hatred for software that
"helpfully" downloads and installs other packages without asking
first.

If you want to proceed along these lines in spite of this, the way to
do it is to add some information to setup.py that lists dependencies.
There is a script, easy_install.py, that uses this information to
install dependencies automatically.  However, I don't know the details
of how to do that.


Carl Banks


From george.sakkis at gmail.com  Thu May 14 21:07:47 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Thu, 14 May 2009 18:07:47 -0700 (PDT)
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<4a0c1a0e$0$31748$426a74cc@news.free.fr>
	<%bXOl.15204$Ux.561@tornado.fastwebnet.it> 
	<4a0c6e42$0$12031$426a74cc@news.free.fr> <guhsvv$cu$1@panix3.panix.com>
Message-ID: <6fbab70a-9c53-49cf-8a24-e83230d0e0a7@l28g2000vba.googlegroups.com>

On May 14, 3:55?pm, a... at pythoncraft.com (Aahz) wrote:
> In article <4a0c6e42$0$12031$426a7... at news.free.fr>,
> Bruno Desthuilliers ?<bdesth.quelquech... at free.quelquepart.fr> wrote:
>
> >Marco Mariani a ?crit :
> >> Bruno Desthuilliers wrote:
>
> >>> Oh, you meant the "return type" ? Nope, no way. It just doesn't make
> >>> sense given Python's dynamic typing.
>
> >> Unless he's really trying to write in Nohtyp,
>
> >You meant "Notype" ?-)
>
> Marco's spelling is correct. ?Try "Nohtyp".reverse()

I tried it:

>>> "Nohtyp".reverse()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'str' object has no attribute 'reverse'

This newfangled Nohtyp language is no good, I want my money back.

George


From david.lyon at preisshare.net  Thu May 14 21:31:42 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Thu, 14 May 2009 21:31:42 -0400
Subject: capture stdout and stderror from within a Windows
	=?UTF-8?Q?Service=3F?=
In-Reply-To: <fbKdndszhZhu3pHXnZ2dnUVZ_uydnZ2d@posted.visi>
References: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
	<fbKdndszhZhu3pHXnZ2dnUVZ_uydnZ2d@posted.visi>
Message-ID: <c817eb8e9dad16e0834ce0690776102c@preisshare.net>

On Thu, 14 May 2009 11:16:51 -0500, Grant Edwards <invalid at invalid> wrote:
> On 2009-05-14, Chris Curvey <ccurvey at gmail.com> wrote:
>> I'm trying to get this invocation right, and it is escaping me.  How
>> can I capture the stdout and stderr if I launch a subprocess using
>> subprocess.check_call()?  The twist here is that the call is running
>> from within a Windows service.
>>
>> I've tried:
>>
>> check_call("mycmd.exe", stdout=subprocess.PIPE)  [raises an exception
>> "An integer is required"]
>>
>> check_call("mycmd.exe", stdout=file("c:\\temp\\foobar.txt", "w"))
>> [raises an exception "An integer is required"]

In the past, windows services have never been allowed to make any output
to the console or the GDI or get any user input. Rules said they could 
send stuff to syslog etc.

All writing can go to logfiles and so forth...

I've never heard of that being allowable....

David



From sjmachin at lexicon.net  Thu May 14 21:48:32 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 14 May 2009 18:48:32 -0700 (PDT)
Subject: How to get all named args in a dict?
References: <guffbh$7do$1@reader1.panix.com>
	<mailman.113.1242254593.8015.python-list@python.org> 
	<guhepj$frm$1@reader1.panix.com>
	<mailman.158.1242328059.8015.python-list@python.org> 
	<guhu4u$i38$1@reader1.panix.com>
	<mailman.178.1242348727.8015.python-list@python.org>
Message-ID: <4d634890-b962-4667-b0fb-1ded132f9013@j9g2000prh.googlegroups.com>

On May 15, 10:46?am, Dave Angel <da... at ieee.org> wrote:
> kj wrote:
> > In <mailman.158.1242328059.8015.python-l... at python.org> Dave Angel <da... at ieee.org> writes:
>
> >> kj wrote:
>
> >>> In <mailman.113.1242254593.8015.python-l... at python.org> Terry Reedy <tjre... at udel.edu> writes:
>
> >>>> kj wrote:
>
> >>>>> Suppose I have the following:
>
> >>>>> def foo(x=None, y=None, z=None):
> >>>>> ? ? d = {"x": x, "y": y, "z": z}
> >>>>> ? ? return bar(d)
>
> >>>>> I.e. foo takes a whole bunch of named arguments and ends up calling
> >>>>> a function bar that takes a single dictionary as argument, and this
> >>>>> dictionary has the same keys as in foo's signature, so to speak.
>
> >>>>> Is there some builtin variable that would be the same as the variable
> >>>>> d, and would thus obviate the need to explicitly bind d?
>
> >>>> Use the built-in function locals()
>
> >>>>>>> def f(a,b):
>
> >>>> ? ? ? ?x=locals()
> >>>> ? ? ? ?print(x)
>
> >>>>>>> f(1,2)
>
> >>>> {'a': 1, 'b': 2}
>
> >>> That's *exactly* what I was looking for. ?Thanks!
>
> >>> kynn
>
> >> You already had a better answer from Chris Rebert:
>
> >> def foo(**kwargs):
> >> ? ?return bar(kwargs)
>
> >> kwargs at this point is exactly a dictionary of the named arguments to foo.
>
> > I disagree. ?If I defined foo as you show above, then there is no
> > error checking on the named parameters passed to foo; anything
> > goes.
>
> >> Because if you try to do anything in this function, you'll probably be
> >> adding more local variables. And then they'd be passed to bar as well.
>
> > That problem is easily solved: just make "x = locals()" the first
> > statement in the definition of foo.
>
> > kynn
>
> Well, you caught me by surprise. ?The name and number of locals is
> determined at compile time, not at run time. ?But when I run an
> experiment, it seems you're right, that the dict changes as the function
> executes.

So don't call it again!

> In Python 2.62 at least, the following function gives the following results:
>
> def myfunc(x, y):
> ? ? print ?locals()
> ? ? s = 42
> ? ? print locals()
>
> myfunc(y=12, x=33)
>
> {'y': 12, 'x': 33}
> {'y': 12, 'x': 33, 's': 42, 'r': {'y': 12, 'x': 33}}
> {'y': 12, 'x': 33}
>
> So, if one wanted to call bar, but not till after one had defined new
> locals, you could do the following:
>
> def foo(x=None, y=None, z=None):
> ? ? ?args = locals().copy()
> ? ? ?a = new stuff
> ? ? ?dosomestuff with a, and maybe y
> ? ? ?bar(args)
>
> A shallow copy would be adequate in this case.

As I (thought I had) demonstrated, *NO* copy would be adequate in that
case.

> Thanks for the correction.



From gagsl-py2 at yahoo.com.ar  Thu May 14 22:47:08 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 14 May 2009 23:47:08 -0300
Subject: (Windows) Finding out which process has locked a file.
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
	<guh02f$re4$2@lust.ihug.co.nz>
Message-ID: <op.utx90uajx6zn5v@lepton.softlabbsas.com.ar>

En Thu, 14 May 2009 08:42:07 -0300, Lawrence D'Oliveiro escribi?:
> In message <787d6072-3381-40bd-
> af20-8e1a40405033 at h23g2000vbc.googlegroups.com>, CinnamonDonkey wrote:
>
>> I have a script running which occa[s]ionally fails because it is trying
>> to delete a file in use by another process. When this happens I want
>> it to log which process has the lock.
>
> Maybe there is no such process. Maybe it's just the Dimdows filesystem
> randomly returning a failure on its own. How would you know?

Oh, c'mon, that's just nonsense and doesn't help anybody.

-- 
Gabriel Genellina



From janssen at parc.com  Thu May 14 23:09:52 2009
From: janssen at parc.com (Bill Janssen)
Date: Thu, 14 May 2009 20:09:52 PDT
Subject: UpLib 1.7.6 available
Message-ID: <y1a8wkzm58f.fsf@marlowe.parc.xerox.com>

I've released the latest version of my UpLib personal digital library
system.

For those of you unfamiliar with UpLib, here's the abstract:

  The UpLib personal digital library system provides a secure
  long-term storage system, and a visually-oriented retrieval
  mechanism, for a wide variety of personal documents such as papers,
  photos, receipts, music, Web pages, books, clippings, and email. It
  is suitable for collections comprising tens of thousands of
  documents, and provides for ease of document entry and access as
  well as high levels of security and privacy. It is highly extensible
  through user scripting, and supports collaborative sharing of those
  extensions through a common extensions library.

It's mainly written in Python -- there's a scrap of C code for page
image zone classification, PyLucene is used for indexing and search,
and there's a fairly extensive Java client-side library, including a
document reader.

Among other things, it includes my Python IMAP server, which allows an
UpLib document repository to be used as an IMAP mail server.

http://uplib.parc.com/

Bill


From vavasis at cpu111.math.uwaterloo.ca  Thu May 14 23:24:51 2009
From: vavasis at cpu111.math.uwaterloo.ca (Stephen Vavasis)
Date: Fri, 15 May 2009 03:24:51 +0000 (UTC)
Subject: C API: how to replace python number object in place?
References: <guhk5c$gb2$1@rumours.uwaterloo.ca>
	<JrudnVSRisF_5pHXnZ2dnUVZ_rOdnZ2d@pdx.net>
Message-ID: <guina3$r76$1@rumours.uwaterloo.ca>

In my previous posting, I inquired how to change a python numeric object 
in place.  Several people responded that this is not possible.  Perhaps I 
should explain the larger problem that I am trying to solve, and then the 
solution will become apparent.  I have a C routine R that invokes a Python 
routine S repeatedly.  This Python routine S takes three arguments, two 
floats and an integer.  I have read the documentation explaining how R can 
use the C API to construct an argument list for invoking S.  The issue 
that baffles me is that, as far as I can tell, each time R invokes S 
again, it needs to deallocate and reallocate the three arguments.  It 
would seem be much more efficient if R could create the argument list once 
and then modify the values inside of it for each subsequent invocation of 
S.

-- Steve Vavasis


In article <JrudnVSRisF_5pHXnZ2dnUVZ_rOdnZ2d at pdx.net>,
Scott David Daniels  <Scott.Daniels at Acm.Org> wrote:

>If you do figurte out how to do what you want, you will put us in the
>old FORTRAN trap:  People can write code that changes the value of a
>constant.
>The code:
>     month = 12 # make it december
>     inches_per_foot = 12
>     make_previous(month)
>     print ('Month is now: %s, inches_per_foot = %s' % (
>                month, inches_per_foot))
>might print:
>     Month is now: 11, inches_per_foot = 11
>
>--Scott David Daniels
>Scott.Daniels at Acm.Org




From totobe at gmail.com  Fri May 15 00:13:45 2009
From: totobe at gmail.com (wdveloper)
Date: Thu, 14 May 2009 21:13:45 -0700 (PDT)
Subject: Call Web Service using proxy and http authentication
References: <3ebae673-2579-4589-b57a-2330c5fe9f3c@j12g2000vbl.googlegroups.com>
	<f8e3d564-b19f-4767-b4cb-b7dfcb86ecca@j18g2000prm.googlegroups.com> 
	<ebab040f-f2e4-4387-8da6-d568b865785a@o27g2000vbd.googlegroups.com> 
	<f17ad6fe-866d-4dbc-bca7-2ed8a8d39bee@v35g2000pro.googlegroups.com>
Message-ID: <167c6e81-c8e3-4476-bbe0-5c7eb4fdb819@r3g2000vbp.googlegroups.com>

On May 13, 5:26?pm, Steve Howell <showel... at yahoo.com> wrote:
> On May 12, 12:51?pm, wdveloper <tot... at gmail.com> wrote:
>
>
>
> > On May 12, 8:38?pm, Steve Howell <showel... at yahoo.com> wrote:
>
> > > On May 12, 8:59?am, wdveloper <tot... at gmail.com> wrote:
>
> > > > Hi everyone,
>
> > > > I am trying to call a webservice which requires an http
> > > > authentication.
> > > > To reach the ws, I must pass from a proxy http. So in the whole I need
> > > > go through two authentications before getting the ws working. I am
> > > > using SOAPpy and I'm getting quite crazy.
> > > > I am able to arrange this problem with simple http calls using urllib2
> > > > but for the ws i dont see any way out.
>
> > > > Does anyone knows how I can manage this stuff? Is there any better
> > > > solution or example code?
>
> > > Your high level description of the problem is good, but I think you'll
> > > get more help if you provide a little more detail.
>
> > > For something like this you may want to try to do more at the HTTP
> > > level, where you have a little more control over the authentication,
> > > and then find a way to hook into SOAPpy just to build and parse the
> > > payloads.
>
> > > How good is your understanding of HTTP? ?Do you know the basics of how
> > > headers work? ?You might want to brush up a little on HTTP just to
> > > help understand what's going on; it will almost certainly be valuable
> > > for future projects as well.
>
> > > To understand how the proxy works in particular, if you can use the
> > > proxy to access a normal html-serving website, you can use the "Live
> > > HTTP Headers" tool under Firefox to see what's going on.
>
> > > But before all that, I would maybe just post a little more detail on
> > > the problem. ?Maybe show code you've written so far, and any error
> > > messages/tracebacks, to better indicate where you are stuck.
>
> > Thank you very much Steve,
>
> > I do have a good understanding of http and its headers rules, and of
> > course I can work on that.
> > On the other hand, I am new to python and SOAPpy toolkit and I dont
> > have much of an experience working with ws in general.
>
> > When it comes of working with simple call to WS, everything is
> > successfull; problems start cause I dont know how to use the toolkit
> > to compose the http request. I should code it in the way that it
> > connects to my proper proxy and it gets authenticated in the server
> > exposing the service.
>
> > What I have is something like:
> > from SOAPpy import WSDL
>
> > wsdl = 'http://myws?wsdl'
> > my_http_proxy = '10.x.x.x:8080'
> > proxy = WSDL.Proxy(wsdl, http_proxy=my_http_proxy)
> > res = proxy.myService( myparam='...' )
>
> > What I get is that connection reaches timeout since the server doesnt
> > see me coming from the right proxy.
> > First problem, I can't see where I can put my proxy authentication
> > username and password.
> > Second, when I will be able to pass through the right proxy, I need to
> > authenticate on the server via http through my credential.
>
> Have you looked at the URLopener class?

At the end what I did is to use the authentication components offered
by urllib2.
Just I had to hand write the SOAP message outcoming, losing the chance
to use SOAPpy.
Anyway it seems to work this way,
thanks again


From pavlovevidence at gmail.com  Fri May 15 00:14:45 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 14 May 2009 21:14:45 -0700 (PDT)
Subject: C API: how to replace python number object in place?
References: <guhk5c$gb2$1@rumours.uwaterloo.ca>
	<JrudnVSRisF_5pHXnZ2dnUVZ_rOdnZ2d@pdx.net> 
	<guina3$r76$1@rumours.uwaterloo.ca>
Message-ID: <87f29853-47ee-4021-aaa1-dc7cd8a6cca2@o14g2000vbo.googlegroups.com>

On May 14, 8:24?pm, vava... at cpu111.math.uwaterloo.ca (Stephen Vavasis)
wrote:
> In my previous posting, I inquired how to change a python numeric object
> in place. ?Several people responded that this is not possible. ?Perhaps I
> should explain the larger problem that I am trying to solve, and then the
> solution will become apparent. ?I have a C routine R that invokes a Python
> routine S repeatedly. ?This Python routine S takes three arguments, two
> floats and an integer. ?I have read the documentation explaining how R can
> use the C API to construct an argument list for invoking S. ?The issue
> that baffles me is that, as far as I can tell, each time R invokes S
> again, it needs to deallocate and reallocate the three arguments.

That's correct.

(Well, not exactly: sometimes PyInt_New can use a pre-existing object
rather than to allocate a new one.  Also ints and floats I think both
use arena allocation, meaning that Python gets big chunks and creates
objects out of that.  It's not like malloc gets called for every
PyInt_New invokation.  But those are implementation details.  Just
trust that Python's been pretty well optimized by now to create new
int and float objects.)


> It
> would seem be much more efficient if R could create the argument list once
> and then modify the values inside of it for each subsequent invocation of
> S.

It really won't make that much of a difference.  Python is creating
and destroying objects all the time.  If you were to execute a line
like this in Python:

a = b + 2.0 / (0.5 * m * v * v)

It'd probably create and delete 5 intermediate number objects.
Whatever small gains you could make by eliminating a few object
allocations in your calling code would hardly be noticeable.


Carl Banks


From __peter__ at web.de  Fri May 15 02:01:48 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 15 May 2009 08:01:48 +0200
Subject: putting date strings in order
References: <dc7e9d9c-5957-45ab-9228-70dafbe46e7a@n4g2000vba.googlegroups.com>
	<guhn01$j0r$03$1@news.t-online.com>
	<UImdnbqCOMOL55HXnZ2dnUVZ_gCdnZ2d@pdx.net>
	<b1a0f614-fae0-4b5b-8c14-5b4cf8a6dc73@t11g2000vbc.googlegroups.com>
Message-ID: <guj0g3$jfv$01$1@news.t-online.com>

noydb wrote:

> On May 14, 4:13 pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
>> Peter Otten wrote:
>> > Hm, if ordered_raster_list is guaranteed to contain one string item for
>> > every month the above can be simplified to
>>
>> > months = [
>> > 'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr',
>> > 'precip_may', 'precip_jun', 'precip_jul', 'precip_aug',
>> > 'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec']
>>
>> > start = 2
>> > ordered_raster_list = months[start-1:] + months[:start-1]
>>
>> Or even:
>> >
>> multi_months = [
>> 'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr',
>> 'precip_may', 'precip_jun', 'precip_jul', 'precip_aug',
>> 'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec'] * 2
>> start = 2
>> ordered_raster_list = multi_months[start - 1: start + 11]
>>
>> --Scott David Daniels
>> Scott.Dani... at Acm.Org
> 
> Peter and Scott --
> 
> ordered_raster_list is guaranteed to have one string item for all 12
> months -- it is just NOT guaranteed to have those in chronological
> order, which is what is required, whether the data starts in january
> (thus ending in dec of same year) or august (thus ending in jul of the
> following year) or whenever.  The initial order of the list is
> dictated by when the raster (precip_<month>) was added to it's
> container.  One would hope the rasters would be added in order, but I
> cannot count on that and shouldn't.

Then you can indeed build the list directly instead of reading it out of 
ListRasters(...) and then sorting it. 

You will get wrong results when there are missing or duplicate months anyway 
unless you work the start month into the lookup dictionary

ordered_months = months[start-1:] + months[:start-1]
month_dict = dict(zip(ordered_months, range(12)))
ordered_raster_list.sort(key=month_dict.get)

or use the modulo key.

Peter



From bijoy.franco at gmail.com  Fri May 15 02:07:08 2009
From: bijoy.franco at gmail.com (bijoy franco)
Date: Fri, 15 May 2009 11:37:08 +0530
Subject: creating python code with dynamic file name
Message-ID: <358348b30905142307h4d7fc1b8wca820ab8a75fcc04@mail.gmail.com>

hi,


How can i create python code, for which filename can be defined on the
fly..?

for example, in a blog, when each article selected, respective python code
with headline of the article as filename should be called.

thanks

bijoy
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From wuwei23 at gmail.com  Fri May 15 03:03:07 2009
From: wuwei23 at gmail.com (alex23)
Date: Fri, 15 May 2009 00:03:07 -0700 (PDT)
Subject: x.abc vs x['abc']
References: <mailman.98.1242244463.8015.python-list@python.org>
Message-ID: <40de0cfb-b4e7-4d37-87e9-382c0dbdac62@d38g2000prn.googlegroups.com>

On May 14, 5:49?am, Gunter Henriksen <gunterhenrik... at gmail.com>
wrote:
> Presuming it is very common to have objects created
> on the fly using some sort of external data
> definitions, is there an obvious common standard
> way to take a dict object and create an object
> whose attribute names are the keys from the dict?

I've always liked this approach, which I first saw in a post by Alex
Martelli:

>>> class Bunch(object):
...     def __init__(self, **kwargs):
...         self.__dict__.update(kwargs)
...
>>> b = Bunch(a=1,b=2,c=3)
>>> b.a
1
>>> b.b
2
>>> b.d = 22
>>> b.d
22


Elegant.


From descentspb at gmail.com  Fri May 15 03:04:43 2009
From: descentspb at gmail.com (Igor Katson)
Date: Fri, 15 May 2009 11:04:43 +0400
Subject: KeyboardInterrupt catch does not shut down the socketserver
Message-ID: <4A0D140B.9040503@gmail.com>

I have problems in getting a SocketServer to shutdown. Why does this not 
actually stop the application?

from SocketServer import UnixStreamServer, BaseRequestHandler

server = UnixStreamServer('/tmp/ss.sock', BaseRequestHandler)
try:
    server.serve_forever()
except KeyboardInterrupt:
    server.shutdown()


After that the server does not respond any more, but the application hangs.

What's the proper way to shutdown the socketserver and what is my mistake?


From er.srivastavarohit at gmail.com  Fri May 15 03:05:19 2009
From: er.srivastavarohit at gmail.com (Rohit Srivastava)
Date: Fri, 15 May 2009 00:05:19 -0700 (PDT)
Subject: File System Redirection Windows x 64 box.
Message-ID: <4c805dd8-f614-4d5d-aff2-940e7da45c17@g19g2000vbi.googlegroups.com>

Hi,

In Windows 2003 x64, I want to call iscsicli.exe which is there only
in system32 directory.
Now since in x64 system windows actually redirect the 32 bit
application to sysWOW64 directory, if it is looking for system32. For
more information look for
<http://msdn.microsoft.com/en-us/library/aa384187(VS.85).aspx >

Now my application is being redirected to this directory and from
python I am always getting an error saying, The program can not find
the file specified.

Any idea, how  can I overcome this, using python? (Condition :: I must
complie for 32 bit system only)
Thanks in Advance

Regards
Rohit


From CinnamonDonkey at googlemail.com  Fri May 15 03:05:46 2009
From: CinnamonDonkey at googlemail.com (CinnamonDonkey)
Date: Fri, 15 May 2009 00:05:46 -0700 (PDT)
Subject: (Windows) Finding out which process has locked a file.
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
	<guh02f$re4$2@lust.ihug.co.nz>
	<mailman.180.1242355642.8015.python-list@python.org>
Message-ID: <4191d437-ba03-408b-951f-ca7ec4b49bd7@o30g2000vbc.googlegroups.com>

I have to say, this has got to be one of the least helpful groups I am
subscribed to.

Some interesting links...

   http://support.microsoft.com/kb/218965

   http://timgolden.me.uk/python/win32_how_do_i/add-security-to-a-file.html#the-short-version

   http://timgolden.me.uk/python/win32_how_do_i/get-the-owner-of-a-file.html




On 15 May, 03:47, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Thu, 14 May 2009 08:42:07 -0300, Lawrence D'Oliveiro escribi?:
>
> > In message <787d6072-3381-40bd-
> > af20-8e1a40405... at h23g2000vbc.googlegroups.com>, CinnamonDonkey wrote:
>
> >> I have a script running which occa[s]ionally fails because it is trying
> >> to delete a file in use by another process. When this happens I want
> >> it to log which process has the lock.
>
> > Maybe there is no such process. Maybe it's just the Dimdows filesystem
> > randomly returning a failure on its own. How would you know?
>
> Oh, c'mon, that's just nonsense and doesn't help anybody.
>
> --
> Gabriel Genellina



From mail at timgolden.me.uk  Fri May 15 03:50:37 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 15 May 2009 08:50:37 +0100
Subject: (Windows) Finding out which process has locked a file.
In-Reply-To: <4191d437-ba03-408b-951f-ca7ec4b49bd7@o30g2000vbc.googlegroups.com>
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>	<guh02f$re4$2@lust.ihug.co.nz>	<mailman.180.1242355642.8015.python-list@python.org>
	<4191d437-ba03-408b-951f-ca7ec4b49bd7@o30g2000vbc.googlegroups.com>
Message-ID: <4A0D1ECD.2020400@timgolden.me.uk>

CinnamonDonkey wrote:
 > I have to say, this has got to be one of the
 > least helpful groups I am subscribed to.

I'm genuinely surprised to hear you say that, especially
about this thread to which you (who appear to be the OP)
have received several replies all pointing you towards
the sysinternals tools which are pretty much the de facto
standard for doing things of this type. They're not
API calls but they're a reasonable compromise between
doing some simple parsing of output and dealing with
some underdocumented and messy low-level NT APIs.

Granted there was one rather silly response but they
really are few and far between on this list I think.
(Or perhaps I just filter them out...)

> Some interesting links...
> 
>    http://support.microsoft.com/kb/218965
> 
>    http://timgolden.me.uk/python/win32_how_do_i/add-security-to-a-file.html#the-short-version
> 
>    http://timgolden.me.uk/python/win32_how_do_i/get-the-owner-of-a-file.html

Unforunately, you're perhaps adding to the not-helpfulness here
since none of those links (and I'm the author of two of them)
address the question. The original request doesn't want to
know what security is preventing you from accessing the file: it
wants to know who has a *lock* on the file, and as I pointed
out earlier, this is only accessible by some low-level API calls.

If I and others have misunderstood the original question, then
please come back and say so, but your original request seems
fairly clearly to point towards file locking and not to
security & ownership.


TJG


From anuraguniyal at yahoo.com  Fri May 15 04:13:15 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 15 May 2009 01:13:15 -0700 (PDT)
Subject: How to catch str exception?
Message-ID: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>


import sys
try:
    raise "xxx"
except str,e:
    print "1",e # is not caught here
except:# is caught here
    print "2",sys.exc_type,sys.exc_value

In the above code a string exception is raised which though deprecated
but still a 3rd party library I use uses it. So how can I catch such
exception without relying on catch all, which could be bad.

system: Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52) [GCC 4.2.3
(Ubuntu 4.2.3-2ubuntu7)] on linux2


From ldo at geek-central.gen.new_zealand  Fri May 15 04:17:03 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 15 May 2009 20:17:03 +1200
Subject: KeyboardInterrupt catch does not shut down the socketserver
References: <mailman.183.1242371089.8015.python-list@python.org>
Message-ID: <guj8dv$5sl$2@lust.ihug.co.nz>

In message <mailman.183.1242371089.8015.python-list at python.org>, Igor Katson 
wrote:

> I have problems in getting a SocketServer to shutdown.

Do you want to do a shutdown or a close?



From descentspb at gmail.com  Fri May 15 04:25:52 2009
From: descentspb at gmail.com (Igor Katson)
Date: Fri, 15 May 2009 12:25:52 +0400
Subject: KeyboardInterrupt catch does not shut down the socketserver
In-Reply-To: <guj8dv$5sl$2@lust.ihug.co.nz>
References: <mailman.183.1242371089.8015.python-list@python.org>
	<guj8dv$5sl$2@lust.ihug.co.nz>
Message-ID: <4A0D2710.2030402@gmail.com>

Lawrence D'Oliveiro wrote:
> In message <mailman.183.1242371089.8015.python-list at python.org>, Igor Katson 
> wrote:
>
>   
>> I have problems in getting a SocketServer to shutdown.
>>     
>
> Do you want to do a shutdown or a close?
>
>   
I want the server close the socket, and the program to continue after 
that (in this case, just to terminate).


From er.srivastavarohit at gmail.com  Fri May 15 04:26:09 2009
From: er.srivastavarohit at gmail.com (Rohit Srivastava)
Date: Fri, 15 May 2009 01:26:09 -0700 (PDT)
Subject: File System Redirection Windows x 64 box.
References: <4c805dd8-f614-4d5d-aff2-940e7da45c17@g19g2000vbi.googlegroups.com>
Message-ID: <896e09e8-8efb-40c7-bb74-3f5e6f27ae69@x6g2000vbg.googlegroups.com>

On May 15, 12:05?pm, Rohit Srivastava <er.srivastavaro... at gmail.com>
wrote:
> Hi,
>
> In Windows 2003 x64, I want to call iscsicli.exe which is there only
> in system32 directory.
> Now since in x64 system windows actually redirect the 32 bit
> application to sysWOW64 directory, if it is looking for system32. For
> more information look for
> <http://msdn.microsoft.com/en-us/library/aa384187(VS.85).aspx>
>
> Now my application is being redirected to this directory and from
> python I am always getting an error saying, The program can not find
> the file specified.
>
> Any idea, how ?can I overcome this, using python? (Condition :: I must
> complie for 32 bit system only)
> Thanks in Advance
>
> Regards
> Rohit

Apologies for the last statement in the previous post.
Please read it as (I need to comply with 32 bit Windows system also).

Regards
Rohit


From giuott at gmail.com  Fri May 15 04:29:41 2009
From: giuott at gmail.com (Giuseppe Ottaviano)
Date: Fri, 15 May 2009 10:29:41 +0200
Subject: [ANN] BPT (Boxed Package Tool) 0.4a -- now with PIP support
Message-ID: <D22BF965-3677-46E1-A1F9-10055BCB8E1C@gmail.com>

Hi all,
I am happy to announce BPT 0.4a

http://pypi.python.org/pypi/bpt

This release is particularly interesting for python users, since it  
includes a modified version of PIP that installs the packages inside  
the box. So, at least for python packages, installation (including  
dependency resolution) is fully automated.

Version 0.4
===========

- Included a forked version of `PIP
<http://pypi.python.org/pypi/pip>`_ 0.3.1 that installs packages in
the current box. Installing python packages is now as easy as
``easy_install``

- Implemented the ``autoremove`` command that removes all the disabled
packages (unless they match given patterns)

- Written some new documentation, added a TODO list

What is BPT
===========

BPT is a Python library (``bpt``) and a command line application
(``box``) to create and manage isolated enviroments, or *boxes*.

- Boxes are *relocatable*, which means that they can be moved to a
different directory or even distributed to other machines (provided
that the architecture is compatible).

- Packages inside the box can be easily disabled, enabled and removed,
so that different versions of the same software can be installed
simultaneously, allowing to switch between them.

- Boxes can be *nested*, in the sense that it is possible to activate
a box environment while inside another box environment, so that all
the packages installed in both boxes are available, and so on.

BPT is similar in some ways to `virtualenv
<http://pypi.python.org/pypi/virtualenv>`_, but it is not restricted
to Python packages, allowing to install virtually any Unix
software. It also takes some ideas from `jhbuild
<http://live.gnome.org/Jhbuild>`_, but without the dependency
resolution and automatic downloading machinery, and the ``bpt-rules``
format is inspired by `Gentoo <http://www.gentoo.org/>`_'s ebuilds.

A fork of PIP_ is included to make installation of python packages
easier, and as an example of use of the BPT API.


Enjoy,
Giuseppe Ottaviano


From kurt at kbsymanzik.org  Fri May 15 04:45:10 2009
From: kurt at kbsymanzik.org (Kurt Symanzik)
Date: Fri, 15 May 2009 16:45:10 +0800
Subject: How to catch str exception?
In-Reply-To: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
Message-ID: <4A0D2B96.1090605@kbsymanzik.org>

"anuraguniyal at yahoo.com" <anuraguniyal at yahoo.com> wrote on 2009-05-15 
4:13:15 PM +0800
> import sys
> try:
>     raise "xxx"
> except str,e:
>     print "1",e # is not caught here
> except:# is caught here
>     print "2",sys.exc_type,sys.exc_value
> 
> In the above code a string exception is raised which though deprecated
> but still a 3rd party library I use uses it. So how can I catch such
> exception without relying on catch all, which could be bad.
> 
> system: Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52) [GCC 4.2.3
> (Ubuntu 4.2.3-2ubuntu7)] on linux2

Try this, i.e. catch the exact string:

except "xxx":


Kurt

-- 
Kurt Symanzik
kurt at kbsymanzik.org
Skype id: ksymanzik
http://kbsymanzik.org


From bruno.42.desthuilliers at websiteburo.invalid  Fri May 15 04:55:48 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 15 May 2009 10:55:48 +0200
Subject: introspection question: get return type
In-Reply-To: <guhsvv$cu$1@panix3.panix.com>
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<4a0c1a0e$0$31748$426a74cc@news.free.fr>
	<%bXOl.15204$Ux.561@tornado.fastwebnet.it>
	<4a0c6e42$0$12031$426a74cc@news.free.fr>
	<guhsvv$cu$1@panix3.panix.com>
Message-ID: <4a0d2e07$0$9422$426a74cc@news.free.fr>

Aahz a ?crit :
> In article <4a0c6e42$0$12031$426a74cc at news.free.fr>,
> Bruno Desthuilliers  <bdesth.quelquechose at free.quelquepart.fr> wrote:
>> Marco Mariani a ?crit :
>>> Bruno Desthuilliers wrote:
>>>> Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
>>>> sense given Python's dynamic typing.
>>> Unless he's really trying to write in Nohtyp,
>> You meant "Notype" ?-)
> 
> Marco's spelling is correct.  Try "Nohtyp".reverse()

Aazh... I know I'm a bit dumb sometimes, but do you *really* think I had 
failed to spot this ???



From svarovsky.tomas at gmail.com  Fri May 15 04:57:58 2009
From: svarovsky.tomas at gmail.com (Tomas Svarovsky)
Date: Fri, 15 May 2009 01:57:58 -0700 (PDT)
Subject: urllib2 slow for multiple requests
References: <2b6d2334-605f-4799-aaee-56a0afc56a8f@s20g2000vbp.googlegroups.com>
	<9ae58862-1cb2-4981-ae6a-0428c7684feb@z5g2000vba.googlegroups.com> 
	<gugpup$1r7$1@south.jnrs.ja.net>
	<747b0d4f-f9fd-4fa6-bb6d-0a4365f328ba@b1g2000vbc.googlegroups.com>
	<guhh5c$8dc$1@south.jnrs.ja.net>
Message-ID: <342d6153-cb70-4efe-9057-f2d86f78db26@z19g2000vbz.googlegroups.com>

On May 14, 6:33?pm, "Richard Brodie" <R.Bro... at rl.ac.uk> wrote:
> "Tomas Svarovsky" <svarovsky.to... at gmail.com> wrote in message
>
> news:747b0d4f-f9fd-4fa6-bb6d-0a4365f328ba at b1g2000vbc.googlegroups.com...
>
> > This is a good point, but then it would manifest regardless of the
> > language used AFAIK. And this is not the case, ruby and php
> > implementations are working quite fine.
>
> What I meant was: not reading the data and leaving the connection
> open is going to force the server to handle all 100 requests concurrently.
> I'm guessing that's not what your other implementations do.
> What happens to the timing if you call response.read(), response.close() ?

Now I get it, but nevertheless, even when I explicitely read from the
socket and then close it properly, the timing still doesn't change.

Thanks for advice though


From anuraguniyal at yahoo.com  Fri May 15 05:15:14 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 15 May 2009 02:15:14 -0700 (PDT)
Subject: How to catch str exception?
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.187.1242377429.8015.python-list@python.org>
Message-ID: <86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>

but the whole point of catching such exception is that i can print its
value
there are many such exceptions and hence it is not feasible to catch
them all or know them all unless i go thru src code.



From zainescu at gmail.com  Fri May 15 05:23:31 2009
From: zainescu at gmail.com (Zainescu Traian)
Date: Fri, 15 May 2009 12:23:31 +0300
Subject: test 23213213
Message-ID: <twaPl.19768$ho7.18257@newsfe10.iad>

test test


From CinnamonDonkey at googlemail.com  Fri May 15 05:24:58 2009
From: CinnamonDonkey at googlemail.com (CinnamonDonkey)
Date: Fri, 15 May 2009 02:24:58 -0700 (PDT)
Subject: (Windows) Finding out which process has locked a file.
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>
	<guh02f$re4$2@lust.ihug.co.nz>
	<mailman.180.1242355642.8015.python-list@python.org> 
	<4191d437-ba03-408b-951f-ca7ec4b49bd7@o30g2000vbc.googlegroups.com> 
	<mailman.184.1242373818.8015.python-list@python.org>
Message-ID: <0a981c1d-871b-4917-8fd3-03493d6dbed3@o30g2000vbc.googlegroups.com>

Thanx for the response Tim! :-) Great site!

 > I'm genuinely surprised to hear you say that...

Early morning frustration... I appologise to all... you are totally
right. Thank you to all for the responses.

The sysinternal "Handle" tool that you made reference to earlier is
definately a working solution with minimal effort and I could indeed
use this to solve the problem.

I'd very much like to understand how such a problem could be solved
programatically though even if it means using some "underdocumented
and messy low-level NT APIs". Whilst taking the simplest approach is
the quickest to an end solution... it's also the least educational.
I'm as interested in how file locking works as I am in solving the
problem.

 > "you're perhaps adding to the not-helpfulness here..."

Again, a valid point and a lesson to be learned... I should actually
read the links I post before posting them! (I actually posted them so
that I could later read them at work).

Yes, this thread is specifically about who has the *lock* on a file.

Thanx TJG for the reality check ;-)

Shaun



On 15 May, 08:50, Tim Golden <m... at timgolden.me.uk> wrote:
> CinnamonDonkey wrote:
>
> ?> I have to say, this has got to be one of the
> ?> least helpful groups I am subscribed to.
>
> I'm genuinely surprised to hear you say that, especially
> about this thread to which you (who appear to be the OP)
> have received several replies all pointing you towards
> the sysinternals tools which are pretty much the de facto
> standard for doing things of this type. They're not
> API calls but they're a reasonable compromise between
> doing some simple parsing of output and dealing with
> some underdocumented and messy low-level NT APIs.
>
> Granted there was one rather silly response but they
> really are few and far between on this list I think.
> (Or perhaps I just filter them out...)
>
> > Some interesting links...
>
> > ? ?http://support.microsoft.com/kb/218965
>
> > ? ?http://timgolden.me.uk/python/win32_how_do_i/add-security-to-a-file.h...
>
> > ? ?http://timgolden.me.uk/python/win32_how_do_i/get-the-owner-of-a-file....
>
> Unforunately, you're perhaps adding to the not-helpfulness here
> since none of those links (and I'm the author of two of them)
> address the question. The original request doesn't want to
> know what security is preventing you from accessing the file: it
> wants to know who has a *lock* on the file, and as I pointed
> out earlier, this is only accessible by some low-level API calls.
>
> If I and others have misunderstood the original question, then
> please come back and say so, but your original request seems
> fairly clearly to point towards file locking and not to
> security & ownership.
>
> TJG



From __peter__ at web.de  Fri May 15 05:46:57 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 15 May 2009 11:46:57 +0200
Subject: How to catch str exception?
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
Message-ID: <gujdm7$cip$01$1@news.t-online.com>

anuraguniyal at yahoo.com wrote:

> but the whole point of catching such exception is that i can print its
> value
> there are many such exceptions and hence it is not feasible to catch
> them all or know them all unless i go thru src code.

Catch them all with a bare except and then reraise non-string exceptions:

try:
    raise "abc"
except:
    e, t, tb = sys.exc_info()
    if not isinstance(e, str):
        raise
    print "caught", e





From anuraguniyal at yahoo.com  Fri May 15 07:50:59 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 15 May 2009 04:50:59 -0700 (PDT)
Subject: How to catch str exception?
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
	<gujdm7$cip$01$1@news.t-online.com>
Message-ID: <62c75d3a-fe31-4b91-b493-58f2d53c105a@k19g2000prh.googlegroups.com>


> try:
> ? ? raise "abc"
> except:
> ? ? e, t, tb = sys.exc_info()
> ? ? if not isinstance(e, str):
> ? ? ? ? raise
> ? ? print "caught", e

This seems to be the solution, thanks


From ldo at geek-central.gen.new_zealand  Fri May 15 07:53:37 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 15 May 2009 23:53:37 +1200
Subject: KeyboardInterrupt catch does not shut down the socketserver
References: <mailman.183.1242371089.8015.python-list@python.org>
	<guj8dv$5sl$2@lust.ihug.co.nz>
	<mailman.185.1242375959.8015.python-list@python.org>
Message-ID: <gujl41$d0r$2@lust.ihug.co.nz>

In message <mailman.185.1242375959.8015.python-list at python.org>, Igor Katson 
wrote:

> Lawrence D'Oliveiro wrote:
>
>> In message <mailman.183.1242371089.8015.python-list at python.org>, Igor
>> Katson wrote:
>>   
>>> I have problems in getting a SocketServer to shutdown.
>>
>> Do you want to do a shutdown or a close?
>>   
> I want the server close the socket ...

You want to do a close, do a close, not a shutdown 
<http://docs.python.org/library/socket.html>.




From gediminas.kregzde at gmail.com  Fri May 15 07:56:08 2009
From: gediminas.kregzde at gmail.com (Gediminas Kregzde)
Date: Fri, 15 May 2009 14:56:08 +0300
Subject: Just wondering
Message-ID: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>

Hello,

I'm Vilnius college II degree student and last semester our teacher
introduced us to python
I've used to program with Delphi, so I very fast adopted to python

Now I'm developing cross platform program and use huge amounts of
data. Program is needed to run as fast as it coud. I've read all tips
about geting performance, but got 1 bug: map function is slower than
for loop for about 5 times, when using huge amounts of data.
It is needed to perform some operations, not to return data.

I'm adding sample code:
from time import time

def doit(i):
   pass

def main():
   a = [0] * 10000000
   t = time()
   map(doit, a)
   print "map time: " + str(time() - t)

def main2():
   t = time()
   a = [0] * 10000000
   for i in a:
       pass
   print "loop time: " + str(time() - t)

main()  # takes approximately 5x times longer than main2()
main2()

I'm wondering were is catch?

I'm using python 2.6 on windows xp sp2 machine

P.S. Sorry for my broken English


From pataphor at gmail.com  Fri May 15 08:03:38 2009
From: pataphor at gmail.com (pataphor)
Date: Fri, 15 May 2009 14:03:38 +0200
Subject: itertools question
In-Reply-To: <mailman.139.1242307225.8015.python-list@python.org>
References: <mailman.139.1242307225.8015.python-list@python.org>
Message-ID: <gujlmr$108$1@news.motzarella.org>

Neal Becker wrote:

> Is there any canned iterator adaptor that will 
> 
> transform:
> in = [1,2,3....]
> 
> into:
> out = [(1,2,3,4), (5,6,7,8),...]
> 
> That is, each time next() is called, a tuple of the next N items is 
> returned.

Here's one that abuses a for loop:

from itertools import islice

def grouper(seq,n):
     it = iter(seq)
     for x in it:
         yield (x,) + tuple(islice(it,n-1))

def test():
     L = range(11)
     n = 3
     for x in grouper(L,n):
         print x

if __name__ == '__main__':
     test()

BTW what's up with the followup to gmane?

P.


From descentspb at gmail.com  Fri May 15 08:04:05 2009
From: descentspb at gmail.com (Igor Katson)
Date: Fri, 15 May 2009 16:04:05 +0400
Subject: KeyboardInterrupt catch does not shut down the socketserver
In-Reply-To: <gujl41$d0r$2@lust.ihug.co.nz>
References: <mailman.183.1242371089.8015.python-list@python.org>	<guj8dv$5sl$2@lust.ihug.co.nz>	<mailman.185.1242375959.8015.python-list@python.org>
	<gujl41$d0r$2@lust.ihug.co.nz>
Message-ID: <4A0D5A35.3010008@gmail.com>

Lawrence D'Oliveiro wrote:
> In message <mailman.185.1242375959.8015.python-list at python.org>, Igor Katson 
> wrote:
>
>   
>> Lawrence D'Oliveiro wrote:
>>
>>     
>>> In message <mailman.183.1242371089.8015.python-list at python.org>, Igor
>>> Katson wrote:
>>>   
>>>       
>>>> I have problems in getting a SocketServer to shutdown.
>>>>         
>>> Do you want to do a shutdown or a close?
>>>   
>>>       
>> I want the server close the socket ...
>>     
>
> You want to do a close, do a close, not a shutdown 
> <http://docs.python.org/library/socket.html>.
>
>
>   
Shutdown implies closing the listening socket, doesn't it?


From bearophileHUGS at lycos.com  Fri May 15 08:06:58 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 15 May 2009 05:06:58 -0700 (PDT)
Subject: Just wondering
References: <mailman.188.1242388571.8015.python-list@python.org>
Message-ID: <ad7b76d0-db80-4eaf-9529-689b23fc8279@j12g2000vbl.googlegroups.com>

Gediminas Kregzde:
> map function is slower than
> for loop for about 5 times, when using huge amounts of data.
> It is needed to perform some operations, not to return data.

Then you are using map() for the wrong purpose. map() purpose is to
build a list of things. Use a for loop.

Bye,
bearophile


From marco at sferacarta.com  Fri May 15 08:21:03 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Fri, 15 May 2009 14:21:03 +0200
Subject: Just wondering
In-Reply-To: <mailman.188.1242388571.8015.python-list@python.org>
References: <mailman.188.1242388571.8015.python-list@python.org>
Message-ID: <Q6dPl.15964$Ux.11735@tornado.fastwebnet.it>

Gediminas Kregzde wrote:


> def doit(i):
>    pass
> 
> def main():
>    a = [0] * 10000000
>    t = time()
>    map(doit, a)
>    print "map time: " + str(time() - t)

Here you are calling a function ten million times, build a list with of 
ten million None results, then throw it away.


> def main2():
>    t = time()
>    a = [0] * 10000000
>    for i in a:
>        pass
>    print "loop time: " + str(time() - t)

Here you do nothing but iterating 'i' over the 'a' list.


> main()  # takes approximately 5x times longer than main2()
> main2()
> 
> I'm wondering were is catch?

Function calls are not free in python. They cost a lot more than they do 
in C, Delphi or other languages.



From stef.mientki at gmail.com  Fri May 15 08:21:27 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Fri, 15 May 2009 14:21:27 +0200
Subject: Just wondering
In-Reply-To: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>
References: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>
Message-ID: <4A0D5E47.6020608@gmail.com>

and this, while it's realy doing something is even 4 times faster than 
main2 ;-)
And if you only need integers, it can be even faster.

def main3():
   from numpy import zeros
   t = time()
   a = zeros ( 10000000 )
   b = a + 3.14
   print "loop time: " + str(time() - t)

cheers,
Stef

Gediminas Kregzde wrote:
> Hello,
>
> I'm Vilnius college II degree student and last semester our teacher
> introduced us to python
> I've used to program with Delphi, so I very fast adopted to python
>
> Now I'm developing cross platform program and use huge amounts of
> data. Program is needed to run as fast as it coud. I've read all tips
> about geting performance, but got 1 bug: map function is slower than
> for loop for about 5 times, when using huge amounts of data.
> It is needed to perform some operations, not to return data.
>
> I'm adding sample code:
> from time import time
>
> def doit(i):
>    pass
>
> def main():
>    a = [0] * 10000000
>    t = time()
>    map(doit, a)
>    print "map time: " + str(time() - t)
>
> def main2():
>    t = time()
>    a = [0] * 10000000
>    for i in a:
>        pass
>    print "loop time: " + str(time() - t)
>
> main()  # takes approximately 5x times longer than main2()
> main2()
>
> I'm wondering were is catch?
>
> I'm using python 2.6 on windows xp sp2 machine
>
> P.S. Sorry for my broken English
>   



From ccurvey at gmail.com  Fri May 15 08:24:03 2009
From: ccurvey at gmail.com (Chris Curvey)
Date: Fri, 15 May 2009 05:24:03 -0700 (PDT)
Subject: capture stdout and stderror from within a Windows Service?
References: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
Message-ID: <1c849439-f572-49c9-b392-3c3e54e5595d@e20g2000vbc.googlegroups.com>

On May 14, 11:57?am, Chris Curvey <ccur... at gmail.com> wrote:
> I'm trying to get this invocation right, and it is escaping me. ?How
> can I capture the stdout and stderr if I launch a subprocess using subprocess.check_call()? ?The twist here is that the call is running
> from within a Windows service.
>
> I've tried:
>
> check_call("mycmd.exe", stdout=subprocess.PIPE) ?[raises an exception
> "An integer is required"]
>
> check_call("mycmd.exe", stdout=file("c:\\temp\\foobar.txt", "w"))
> [raises an exception "An integer is required"]

Ahhh, Blake put me on the right track.  If you want any of the
streams, you have to supply values for all of them, like so:

p = subprocess.Popen(step, shell=True
      stdout=subprocess.PIPE,
      stdin=subprocess.PIPE,
      stderr=subprocess.PIPE)

(stdout, stderr) = p.communicate()

and, incidentally, it appears that you have to use UNC paths in your
Popen call -- drive letters won't work.

so "dir \\foobar\myshare\mydir" will work, but "dir j:\mydir" will
not.

Many thanks for all your assistance.




From __peter__ at web.de  Fri May 15 08:24:07 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 15 May 2009 14:24:07 +0200
Subject: Just wondering
References: <mailman.188.1242388571.8015.python-list@python.org>
Message-ID: <gujmst$fq2$00$1@news.t-online.com>

Gediminas Kregzde wrote:

> Now I'm developing cross platform program and use huge amounts of
> data. Program is needed to run as fast as it coud. I've read all tips
> about geting performance, but got 1 bug: map function is slower than
> for loop for about 5 times, when using huge amounts of data.
> It is needed to perform some operations, not to return data.
> 
> I'm adding sample code:
> from time import time
> 
> def doit(i):
>    pass
> 
> def main():
>    a = [0] * 10000000
>    t = time()
>    map(doit, a)
>    print "map time: " + str(time() - t)
> 
> def main2():
>    t = time()
>    a = [0] * 10000000
>    for i in a:
>        pass
>    print "loop time: " + str(time() - t)
> 
> main()  # takes approximately 5x times longer than main2()
> main2()
> 
> I'm wondering were is catch?
> 
> I'm using python 2.6 on windows xp sp2 machine

Two factors: 

(1) building another throwaway list and
(2) function call overhead for calling doit()

You can avoid (1) by using filter() instead of map() and verify (2) by 
changing the loop to

for i in a:
    doit(i)

Peter



From jaime.frio at gmail.com  Fri May 15 08:27:25 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Fri, 15 May 2009 14:27:25 +0200
Subject: Just wondering
In-Reply-To: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>
References: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>
Message-ID: <97a8f1a70905150527l2b69ab3fq10a8cdcdab7fb865@mail.gmail.com>

map is creating a new list of 10,000,000 items, not modifying the
values inside list a. That's probably where your time difference comes
from...

Jaime

On Fri, May 15, 2009 at 1:56 PM, Gediminas Kregzde
<gediminas.kregzde at gmail.com> wrote:
> Hello,
>
> I'm Vilnius college II degree student and last semester our teacher
> introduced us to python
> I've used to program with Delphi, so I very fast adopted to python
>
> Now I'm developing cross platform program and use huge amounts of
> data. Program is needed to run as fast as it coud. I've read all tips
> about geting performance, but got 1 bug: map function is slower than
> for loop for about 5 times, when using huge amounts of data.
> It is needed to perform some operations, not to return data.
>
> I'm adding sample code:
> from time import time
>
> def doit(i):
> ? pass
>
> def main():
> ? a = [0] * 10000000
> ? t = time()
> ? map(doit, a)
> ? print "map time: " + str(time() - t)
>
> def main2():
> ? t = time()
> ? a = [0] * 10000000
> ? for i in a:
> ? ? ? pass
> ? print "loop time: " + str(time() - t)
>
> main() ?# takes approximately 5x times longer than main2()
> main2()
>
> I'm wondering were is catch?
>
> I'm using python 2.6 on windows xp sp2 machine
>
> P.S. Sorry for my broken English
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From andzy+comp.pyuser at imap-mail.com  Fri May 15 08:28:49 2009
From: andzy+comp.pyuser at imap-mail.com (Andrew Malcolmson)
Date: Fri, 15 May 2009 08:28:49 -0400
Subject: Configure options for minimal Python 2.6
Message-ID: <1242390529.7885.1315620323@webmail.messagingengine.com>

I want to compile a minimal Python 2.6 for Debian Etch without support
for optional features such as tk and sphinx.  The configure script's
help says that features can be disabled with an '--without-PACKAGE', so
I guess disabling tk is '--without-tk', but where is there a list of the
feature/package names of the other optional components?
-------------------
Andrew Malcolmson



From davea at ieee.org  Fri May 15 08:33:32 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 08:33:32 -0400
Subject: creating python code with dynamic file name
In-Reply-To: <358348b30905142307h4d7fc1b8wca820ab8a75fcc04@mail.gmail.com>
References: <358348b30905142307h4d7fc1b8wca820ab8a75fcc04@mail.gmail.com>
Message-ID: <4A0D611C.7010109@ieee.org>

bijoy franco wrote:
> hi,
>
>
> How can i create python code, for which filename can be defined on the
> fly..?
>
> for example, in a blog, when each article selected, respective python code
> with headline of the article as filename should be called.
>
> thanks
>
> bijoy
>
>   
You could have been much clearer in your requirements.  I have to guess:

Perhaps you're writing a CGI script to run on Linux, with Python 2.3.  
You need to be able to import a different python file, depending on some 
data calculation.  You have three different such python files, whose 
names are known ahead of time.
     if   data == "English":
          import   english
     elif   data == "Spanish":
          import  spanish
     else:
          import nativeamerican

Or is it:
You're writing a script on Windows Server 2003, that's going to generate 
python 3.0 source code, and html, and the code and the html it generates 
is dependent on some data retrieved from Yahoo stock quotes.  The python 
all has to be version 3.1


Supply your environment, your requirements, some example data, and some 
test code that doesn't quite work.  Then someone will probably be able 
to point out the problem.


I could suggest you play with __import__()   But of course that's not 
available everywhere.




From jaime.frio at gmail.com  Fri May 15 08:36:39 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Fri, 15 May 2009 14:36:39 +0200
Subject: Just wondering
In-Reply-To: <gujmst$fq2$00$1@news.t-online.com>
References: <mailman.188.1242388571.8015.python-list@python.org>
	<gujmst$fq2$00$1@news.t-online.com>
Message-ID: <97a8f1a70905150536p38111f10ra19b2d4ac579d7fb@mail.gmail.com>

> (1) building another throwaway list and
> (2) function call overhead for calling doit()
>
> You can avoid (1) by using filter() instead of map()

Are you sure of this? My python returns, when asked for help(filter) :

Help on built-in function filter in module __builtin__:

filter(...)
    filter(function or None, sequence) -> list, tuple, or string

    Return those items of sequence for which function(item) is true.  If
    function is None, return the items that are true.  If sequence is a tuple
    or string, return the same type, else return a list.

I'm afraid there is no builtin function to do an inplace modification
of a sequence...


-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From bruno.42.desthuilliers at websiteburo.invalid  Fri May 15 08:58:08 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 15 May 2009 14:58:08 +0200
Subject: Just wondering
In-Reply-To: <mailman.188.1242388571.8015.python-list@python.org>
References: <mailman.188.1242388571.8015.python-list@python.org>
Message-ID: <4a0d66d3$0$3124$426a74cc@news.free.fr>

Gediminas Kregzde a ?crit :
> Hello,
> 
> I'm Vilnius college II degree student and last semester our teacher
> introduced us to python
> I've used to program with Delphi, so I very fast adopted to python
> 
> Now I'm developing cross platform program and use huge amounts of
> data. Program is needed to run as fast as it coud. I've read all tips
> about geting performance, but got 1 bug: map function is slower than
> for loop 

Why should it be a bug ?

> for about 5 times,

read below for comments on your benchmark.

> when using huge amounts of data.
> It is needed to perform some operations, not to return data.

Then don't use map. You're uselessly building a new list (which takes 
time *and* eats RAM - so on 'huge' dataset, this might even make your 
system start swapping).



> I'm adding sample code:
> from time import time

The correct way to time code is to use the timeit module.

> def doit(i):
>    pass
> 
> def main():
>    a = [0] * 10000000
>    t = time()
>    map(doit, a)
>    print "map time: " + str(time() - t)
> 
> def main2():
>    t = time()
>    a = [0] * 10000000
>    for i in a:
>        pass

Your benchmark is screwed. In the first case, you call doit() X times 
(with X = len(a)), while in the second case you don't call it at all.



From davea at ieee.org  Fri May 15 09:02:46 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 09:02:46 -0400
Subject: File System Redirection Windows x 64 box.
In-Reply-To: <4c805dd8-f614-4d5d-aff2-940e7da45c17@g19g2000vbi.googlegroups.com>
References: <4c805dd8-f614-4d5d-aff2-940e7da45c17@g19g2000vbi.googlegroups.com>
Message-ID: <4A0D67F6.6050101@ieee.org>

Rohit Srivastava wrote:
> Hi,
>
> In Windows 2003 x64, I want to call iscsicli.exe which is there only
> in system32 directory.
> Now since in x64 system windows actually redirect the 32 bit
> application to sysWOW64 directory, if it is looking for system32. For
> more information look for
> <http://msdn.microsoft.com/en-us/library/aa384187(VS.85).aspx >
>
> Now my application is being redirected to this directory and from
> python I am always getting an error saying, The program can not find
> the file specified.
>
> Any idea, how  can I overcome this, using python? (Condition :: I must
> complie for 32 bit system only)
> Thanks in Advance
>
> Regards
> Rohit
>
>   
My experience with Microsoft's 64 bit systems is limited to the Itanium 
system (while it was still called Merced), prerelease.

<rabbittrail>
Shadowing directories has to be a big mistake.  And especially if the 
directory is called "system32."   Seems logical that there could be 
another one called "system64".  And that 64 bit applications would have 
to have their sources tweaked while being ported from a different OS.

I remember FILEPATH and DATAPATH, in DOS days.  It tried to 
automatically alias directory locations on a file open, similar to what 
PATH does for program launches.  But many applications, when trying to 
update their files, put the update back in the user-supplied directory, 
so you ended up with two copies, one out of date.   Big mess.
</rabbittrail>

I presume the reason that  iscsicli.exe is located there is that it's a 
64 bit executable?

Why not follow some of the advice in the page you quoted?   You probably 
can't use SysNative, since it was introduced with Vista.  But what's 
wrong with Wow64DisableWow64FsRedirection() ??
see  http://msdn.microsoft.com/en-us/library/aa365743(VS.85).aspx


The page says it's available on Server 2003, as of SP1.  If you can't be 
sure SP1 is installed, I'm not sure what to suggest.  A batch or CMD 
file?   Or are those restricted as well?



From __peter__ at web.de  Fri May 15 09:03:33 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 15 May 2009 15:03:33 +0200
Subject: Just wondering
References: <mailman.188.1242388571.8015.python-list@python.org>
	<gujmst$fq2$00$1@news.t-online.com>
	<mailman.194.1242391000.8015.python-list@python.org>
Message-ID: <gujp6s$k9d$00$1@news.t-online.com>

Jaime Fernandez del Rio wrote:

>> (1) building another throwaway list and
>> (2) function call overhead for calling doit()
>>
>> You can avoid (1) by using filter() instead of map()
> 
> Are you sure of this? 

> I'm afraid there is no builtin function to do an inplace modification
> of a sequence...
 
You are right. 

But the OP invokes map() for the side effect of calling doit(item) for every 
item in the (huge) list and then gets another list of the same length 
containing only None values. by using filter() instead of map() with doit 
always returning None he gets an empty result list which means less wasted 
effort:

>>> items = range(10)
>>> map(doit, items)
[None, None, None, None, None, None, None, None, None, None]
>>> filter(doit, items)
[]

Peter



From e.kroske at gmail.com  Fri May 15 09:06:15 2009
From: e.kroske at gmail.com (Evan Kroske)
Date: Fri, 15 May 2009 09:06:15 -0400
Subject: Your Favorite Python Book
In-Reply-To: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
Message-ID: <4A0D68C7.4070906@gmail.com>

Sam Tregar wrote:
> Greetings. I'm working on learning Python and I'm looking for good 
> books to read. I'm almost done with Dive into Python and I liked it a 
> lot. I found Programming Python a little dry the last time I looked at 
> it, but I'm more motivated now so I might return to it. What's your 
> favorite? Why?
>
> -sam
>
Programming Python is good, but its examples follow a function-based
(not functional) style that I don't like. Most of the applications are a
mix of function libraries and scripts, and there's almost no
object-oriented best-practices content.

I don't have a recommendation; that's the only Python book I own.

-- 
Evan Kroske
Welcome2Obscurity.Blogspot.com <http://welcome2obscurity.blogspot.com>
Glory is fleeting, but obscurity is forever. ? some French guy



From mail at timgolden.me.uk  Fri May 15 09:06:33 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 15 May 2009 14:06:33 +0100
Subject: capture stdout and stderror from within a Windows Service?
In-Reply-To: <1c849439-f572-49c9-b392-3c3e54e5595d@e20g2000vbc.googlegroups.com>
References: <e4d68a0b-a9a1-409f-8da5-3180fed6ca15@z19g2000vbz.googlegroups.com>
	<1c849439-f572-49c9-b392-3c3e54e5595d@e20g2000vbc.googlegroups.com>
Message-ID: <4A0D68D9.9010509@timgolden.me.uk>

Chris Curvey wrote:
> Ahhh, Blake put me on the right track.  If you want any of the
> streams, you have to supply values for all of them, like so:
> 
> p = subprocess.Popen(step, shell=True
>       stdout=subprocess.PIPE,
>       stdin=subprocess.PIPE,
>       stderr=subprocess.PIPE)
> 
> (stdout, stderr) = p.communicate()
> 
> and, incidentally, it appears that you have to use UNC paths in your
> Popen call -- drive letters won't work.


This is because you're running in a service. Drive letters
aren't system wide: they're per-user. The service won't
know about any drive letters you or anyone else happens
to have mapped.

TJG


From jaime.frio at gmail.com  Fri May 15 09:08:30 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Fri, 15 May 2009 15:08:30 +0200
Subject: Representing a Tree in Python
In-Reply-To: <74fba814-bd05-4d4d-bf44-63750b2ef428@f1g2000prb.googlegroups.com>
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com>
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>
	<mailman.78.1242202760.8015.python-list@python.org>
	<74fba814-bd05-4d4d-bf44-63750b2ef428@f1g2000prb.googlegroups.com>
Message-ID: <97a8f1a70905150608v5cc79d6bjbcecce31a472ba54@mail.gmail.com>

If you run Dijkstra without a third argument, i.e. without an end
node, the it will compute the shortest paths from your start node to
all nodes in the tree. So by doing something like:

start_node = 1
end_nodes = [2,3,5]

D, P = Dijkstra(G, start_node)

You will then have in D a dictionary with distances to all nodes, and
in P a dictionary of preceding nodes along the shortest path for each
node. You could tweak the Dijkstra function so that it stops when the
minimum distances to all elements of end_nodes have been calculated,
without having to solve for the whole graph...

Apart from that, how you want to store the shortest path information
is up to you, but if you stick to the "graph as a dictionary of
dictionaries" you can construct the subgraph that contains only the
nodes in the shortest paths between the start and the end nodes with
code like this one:

shortest_tree = {}
current_layer = end_nodes
while current_layer != [start_node] :
    new_layer = set()
    for node in current_layer :
        new_node = P[node]
        if new_node in shortest_tree :
            if node not in shortest_tree[new_node] :
                shortest_tree[new_node][node] = G[new_node][node]
        else :
            shodtest_tree[new_node] = {}
            shortest_tree[new_node][node] = G[new_node][node]
        new_layer.add(new_node)
    current_layer = [j for j in new_layer]

I haven't tested the code, and there may be more efficient ways of
achieving the same, though...

Jaime

On Wed, May 13, 2009 at 10:49 AM, godshorse <chinthakawk at gmail.com> wrote:
> On May 13, 3:19?pm, Jaime Fernandez del Rio <jaime.f... at gmail.com>
> wrote:
>> Dijkstra's algorithm computes shortest paths between a node and _ALL_
>> other nodes in the graph. It is usually stopped once computing the
>> shortest path to the target node is done, but that's simply for
>> efficiency, not a limitation of the algorithm. So you should be able
>> to tweak the code you are using so that it provides you with all you
>> are looking for. I'd be surprised if graphine (which, by the way,
>> looks great, CTO) or any other graph package didn't implement it, so
>> switching to that may be the most efficient thing to do.
>>
>> On the other hand, if you want to post your code and links to the
>> Dijkstra code you are using it may be possible to help you with the
>> tweaking...
>>
>> Jaime
>>
>>
>>
>> On Wed, May 13, 2009 at 8:31 AM, godshorse <chinthak... at gmail.com> wrote:
>> > On May 13, 11:54?am, CTO <debat... at gmail.com> wrote:
>> >> On May 13, 12:10?am, godshorse <chinthak... at gmail.com> wrote:
>>
>> >> > Hello,
>>
>> >> > I want to find out the shortest path tree from a root to several nodes
>> >> > in a graph data structure. I found a Dijkstra code from internet that
>> >> > finds shortest path between only two nodes. How can i extend it to a
>> >> > tree?. And what is the best way to represent a tree in Python?.
>>
>> >> > Thank you,
>>
>> >> Well, I'm biased, but I like <URL:http://graphine.org>.
>> >> As an example, to build a five node tree:
>>
>> >> >>> from graph.base import Graph
>> >> >>> g = Graph()
>> >> >>> for i in range(5):
>>
>> >> ... ? ? g.add_node(i)
>> >> ...
>>
>> >> >>> g.add_edge(0, 1)
>> >> >>> g.add_edge(0, 2)
>> >> >>> g.add_edge(1, 3)
>> >> >>> g.add_edge(1, 4)
>>
>> >> And to find the shortest path between, say, node 0 and node 4:
>>
>> >> >>> start = g[0]
>> >> >>> end = g[4]
>> >> >>> distance, edges = g.get_shortest_paths(start)[end]
>> >> >>> distance
>> >> 2
>> >> >>> edges
>>
>> >> [Edge(name=(0,1)), Edge(name=(1,4))]
>>
>> >> Let me know what you think if you decide to use it- I'm looking for
>> >> feedback.
>>
>> >> Geremy Condra
>>
>> > Thanks very much for your reply Geremy. That site was interesting.
>>
>> > Actually the Graph building part is already completed now. I used a
>> > dictionary for that and it works fine. for Dijkstra shortest path
>> > problem your suggestion can be used.
>>
>> > But let me clear the my problem again. I have a graph. and I want to
>> > find 'shortest path tree' from a root node to several nodes. as a
>> > example if we have a graph of 5 nodes from 1 to 5, I need to build the
>> > shortest path tree from node 1 to nodes 2,3,5. So my question is
>> > instead of keeping separate lists for each destination node's shortest
>> > path. How can I represent and store them in a tree structure using
>> > python. Then I can easily find out what are the common nodes in the
>> > path to each destination.
>>
>> > Thanks once again.
>> > --
>> >http://mail.python.org/mailman/listinfo/python-list
>>
>> --
>> (\__/)
>> ( O.o)
>> ( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
>> planes de dominaci?n mundial.
>
> Hello Jaime,
>
> Thanks for the reply.
>
> This is the link to the code that I am using. http://code.activestate.com/recipes/119466/
> What I do in my code is just looping through the destination nodes and
> find the shortest path to each node.
>
> Thanks
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From davea at ieee.org  Fri May 15 09:12:39 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 09:12:39 -0400
Subject: How to catch str exception?
In-Reply-To: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
Message-ID: <4A0D6A47.8000406@ieee.org>

anuraguniyal at yahoo.com wrote:
> import sys
> try:
>     raise "xxx"
> except str,e:
>     print "1",e # is not caught here
> except:# is caught here
>     print "2",sys.exc_type,sys.exc_value
>
> In the above code a string exception is raised which though deprecated
> but still a 3rd party library I use uses it. So how can I catch such
> exception without relying on catch all, which could be bad.
>
> system: Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52) [GCC 4.2.3
> (Ubuntu 4.2.3-2ubuntu7)] on linux2
>
>   
Just fix the except type to be the exception caused by the illegal "raise"

except TypeError,e:
    print "1",e # is caught here


1 exceptions must be classes or instances, not str



From urbangabo at gmail.com  Fri May 15 09:22:52 2009
From: urbangabo at gmail.com (Gabor Urban)
Date: Fri, 15 May 2009 15:22:52 +0200
Subject: New to python, can i ask for a little help? (Andrew Chung)
Message-ID: <f7ac28aa0905150622h2fda100o62f0a69c38005bd2@mail.gmail.com>

I gues, it was rather simple...

Begin with simple tasks, figure out how to do them. If you are
proceding well, then increase difficulty/complexity.

Gabor
-- 
Linux: Choice of a GNU Generation


From manu3d at gmail.com  Fri May 15 09:23:27 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Fri, 15 May 2009 06:23:27 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
	<fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com> 
	<d3631430-f8b9-42ce-af42-df4f3c5ef186@o14g2000vbo.googlegroups.com>
Message-ID: <ad04c939-ff12-4543-9fc5-8a099e99ed0e@x6g2000vbg.googlegroups.com>

Hey Paul,

would you mind continuing this thread on Python + DOM? I'm trying to
implement a DOM Events-like set of classes and I could use another
brain that has some familiarity with the DOM to bounce ideas with. If
you are too busy never mind. Also, I thought of keeping the discussion
here rather than via email, for the benefit of current and future
readers.

Manu


From denis.papathanasiou at gmail.com  Fri May 15 09:27:59 2009
From: denis.papathanasiou at gmail.com (dpapathanasiou)
Date: Fri, 15 May 2009 06:27:59 -0700 (PDT)
Subject: mod_python and xml.dom.minidom
References: <83b63d98-9871-47eb-8846-46404b70896e@z7g2000vbh.googlegroups.com>
	<12ef7b00-f0c5-4030-a353-533d93d23cdd@r3g2000vbp.googlegroups.com> 
	<794f117f-4df5-4c6c-be68-f901959b2579@y10g2000prc.googlegroups.com> 
	<d64eeab4-f07c-4f06-a70c-0c78278b2c2f@r34g2000vba.googlegroups.com> 
	<037bc6d0-3d2e-45bd-91d3-d3051fbfa149@s31g2000vbp.googlegroups.com> 
	<55f21331-72eb-4c60-a600-93ac563d1639@p6g2000pre.googlegroups.com>
Message-ID: <5732e99b-7a0c-4845-b105-a8cca15bd0b6@g19g2000vbi.googlegroups.com>


> Were you getting this issue with xml.dom showing on first request all
> the time, or only occasionally occurring? If the latter, were you
> running things in a multithreaded configuration and was the server
> being loaded with lots of concurrent requests?

It was the former.

> For your particular Python installation, does the '_xmlplus' module
> exist? Ie., can you import it as '_xmlplus' or 'xml.doc._xmlplus'?

No, it appears I don't have _xmlplus; neither 'import _xmlplus' nor
'import xml.doc._xmlplus' works.

My python installation is the default which came with debian 5.0
(i.e., I didn't build it from source with unorthodox configuration
options, or use apt).

As a final note, I wound up switching to cElementTree for parsing the
xml (not only for performance but also because the code is much more
concise), and I found that I don't need a full package path with that
module.

I.e, the import statement is:

from cElementTree import ElementTree, Element, SubElement, iterparse,
tostring, fromstring

and within each function I can simply refer to Element, SubElement,
etc. w/o the full path prefix.


From anica_1069 at hotmail.com  Fri May 15 09:58:16 2009
From: anica_1069 at hotmail.com (anica_1069 at hotmail.com)
Date: Fri, 15 May 2009 06:58:16 -0700 (PDT)
Subject: python
Message-ID: <629cf901-516f-4888-90c5-d6174bdf9b5e@r3g2000vbp.googlegroups.com>

hello, I?m a student of linguistic an I need do this exercises. Can
anybody help me,please?
Thanks


? Read in some text from a corpus, tokenize it, and print the list of
all wh-word types that occur. (wh-words in English are used in
questions, relative clauses and exclamations: who, which, what, and so
on.) Print them in order. Are any words duplicated in this list,
because of the presence of case distinctions or punctuation?

? Create a file consisting of words and (made up) frequencies, where
each line consists of a word, the space character, and a positive
integer, e.g. fuzzy 53. Read the file into a Python list using open
(filename).readlines(). Next, break each line into its two fields
using split(), and convert the number into an integer using int(). The
result should be a list of the form: [['fuzzy', 53], ...].


From sam at tregar.com  Fri May 15 10:04:44 2009
From: sam at tregar.com (Sam Tregar)
Date: Fri, 15 May 2009 10:04:44 -0400
Subject: Your Favorite Python Book
In-Reply-To: <4A0D68C7.4070906@gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<4A0D68C7.4070906@gmail.com>
Message-ID: <fe3354e50905150704p68120656w6573e58d5085684@mail.gmail.com>

Thanks for the suggestions everyone!  I've got a copy of Core Python 2nd
Edition on the way.

-sam
-------------- next part --------------
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From anuraguniyal at yahoo.com  Fri May 15 10:12:21 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 15 May 2009 07:12:21 -0700 (PDT)
Subject: How to catch str exception?
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.199.1242393171.8015.python-list@python.org>
Message-ID: <bbc8bd2d-c331-4c2d-a2ef-f137c01d25ec@d2g2000pra.googlegroups.com>


> except TypeError,e:
> ? ? print "1",e # is caught here
>
> 1 exceptions must be classes or instances, not str

doesn't happen so in 2.5.2


From andreengels at gmail.com  Fri May 15 10:15:40 2009
From: andreengels at gmail.com (Andre Engels)
Date: Fri, 15 May 2009 16:15:40 +0200
Subject: python
In-Reply-To: <629cf901-516f-4888-90c5-d6174bdf9b5e@r3g2000vbp.googlegroups.com>
References: <629cf901-516f-4888-90c5-d6174bdf9b5e@r3g2000vbp.googlegroups.com>
Message-ID: <6faf39c90905150715p32fc3384m69684fde1f1fb43e@mail.gmail.com>

We may be willing to help you with your homework, but we will not be
doing it for you. Please tell us what you have got (whether it be a
non-working a program, a partial program or just some ideas about what
you might need to do) and what you think is stopping you from getting
further.

2009/5/15  <anica_1069 at hotmail.com>:
> hello, I?m a student of linguistic an I need do this exercises. Can
> anybody help me,please?
> Thanks
>
>
> ? Read in some text from a corpus, tokenize it, and print the list of
> all wh-word types that occur. (wh-words in English are used in
> questions, relative clauses and exclamations: who, which, what, and so
> on.) Print them in order. Are any words duplicated in this list,
> because of the presence of case distinctions or punctuation?
>
> ? Create a file consisting of words and (made up) frequencies, where
> each line consists of a word, the space character, and a positive
> integer, e.g. fuzzy 53. Read the file into a Python list using open
> (filename).readlines(). Next, break each line into its two fields
> using split(), and convert the number into an integer using int(). The
> result should be a list of the form: [['fuzzy', 53], ...].
> --
> http://mail.python.org/mailman/listinfo/python-list
>





-- 
Andr? Engels, andreengels at gmail.com


From google at mrabarnett.plus.com  Fri May 15 10:17:15 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 15 May 2009 15:17:15 +0100
Subject: How to catch str exception?
In-Reply-To: <86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
Message-ID: <4A0D796B.2000102@mrabarnett.plus.com>

anuraguniyal at yahoo.com wrote:
> but the whole point of catching such exception is that i can print its
> value
> there are many such exceptions and hence it is not feasible to catch
> them all or know them all unless i go thru src code.
> 
If string exceptions are so difficult to use, don't use them! :-)

It would be better to write your own exception class:

class MyException(Exception):
     pass

try:
     raise MyException("Something bad happened!")
except MyException, e:
     print "ERROR: %s" % e


From anuraguniyal at yahoo.com  Fri May 15 10:18:40 2009
From: anuraguniyal at yahoo.com (anuraguniyal at yahoo.com)
Date: Fri, 15 May 2009 07:18:40 -0700 (PDT)
Subject: How to catch str exception?
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
	<mailman.203.1242397029.8015.python-list@python.org>
Message-ID: <08e5a709-3a67-40fd-9765-8f91d85514a5@j18g2000prm.googlegroups.com>


> It would be better to write your own exception class:
>
> class MyException(Exception):
> ? ? ?pass


and how would i automatically inject this into 3rd part library


From moradks at gmail.com  Fri May 15 10:34:19 2009
From: moradks at gmail.com (Morad)
Date: Fri, 15 May 2009 07:34:19 -0700 (PDT)
Subject: Can't run PyQt apps with MacPython
References: <25cdb69b-689c-4cfe-a378-3016b3d50e50@s21g2000vbb.googlegroups.com>
	<gufl3t$6t$1@get-news01.get.basefarm.net>
Message-ID: <ed9257fa-df62-4dbb-b0c5-9129e1c5ffbb@s20g2000vbp.googlegroups.com>

On May 13, 7:29?pm, David Boddie <da... at boddie.org.uk> wrote:
> On Wednesday 13 May 2009 17:53, Morad wrote:
>
> > I recently got a new MacBook Pro with Leopard, and would like to
> > develop using Python and PyQt. I installed the latest Qt SDK, updated
> > MacPython to V 2.5.4 and then proceeded to install SIP and PyQt as
> > described in Mark Summerfield's book on PyQt Programming. Everything
> > went fine and none of the scripts complained. However when I want to
> > run a demo app, I get the error message "Fatal Python error:
> > Interpreter not initialized (version mismatch?) / Abort Trap". Anybody
> > can help?
>
> This page suggests a possible conflict between installed Python
> interpreters:
>
> http://aralbalkan.com/1675/comment-page-1
>
> A post to the PyQt mailing list talks about the correct way to build from
> source, but it may not be relevant in this case:
>
> http://www.riverbankcomputing.com/pipermail/pyqt/2006-July/013766.html
>
> It may just be worth checking that SIP and PyQt were built and installed
> for the interpreter you expected. Failing that, you might want to ask this
> again on the PyQt mailing list:
>
> http://www.riverbankcomputing.com/pipermail/pyqt/
>
> David

Thanks David. What I managed to do as an interim solution is simply to
remove MacPython and reinstall SIP and PyQt using the default version
of Python that comes with Apple, and then everything works. Next I
will retry how to use a more uptodate version, maybe I compiled SIP
etc. with the wrong version. If I have more questions I will use the
PyQt mailing list, thanks for the tip!

Morad


From kyosohma at gmail.com  Fri May 15 10:37:45 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 15 May 2009 07:37:45 -0700 (PDT)
Subject: python
References: <629cf901-516f-4888-90c5-d6174bdf9b5e@r3g2000vbp.googlegroups.com>
Message-ID: <81b65d37-2b40-4479-8568-01044988eb25@h23g2000vbc.googlegroups.com>

On May 15, 8:58 am, anica_1... at hotmail.com wrote:
> hello, I?m a student of linguistic an I need do this exercises. Can
> anybody help me,please?
> Thanks
>
> ? Read in some text from a corpus, tokenize it, and print the list of
> all wh-word types that occur. (wh-words in English are used in
> questions, relative clauses and exclamations: who, which, what, and so
> on.) Print them in order. Are any words duplicated in this list,
> because of the presence of case distinctions or punctuation?


This requires learning file I/O and some string manipulation
techniques. I would probably read each line, split on spaces and then
loop over each word and check for "wh" and add them to a new list.
After reading the file, you'd then use a sort to get them in the right
order.

>
> ? Create a file consisting of words and (made up) frequencies, where
> each line consists of a word, the space character, and a positive
> integer, e.g. fuzzy 53. Read the file into a Python list using open
> (filename).readlines(). Next, break each line into its two fields
> using split(), and convert the number into an integer using int(). The
> result should be a list of the form: [['fuzzy', 53], ...].

I recommend reading the Python Tutorial: http://python.org/doc/

If you're using Python 2.x, then check out http://www.diveintopython.org/

If you're using 3.0, your primary options are the online docs and
"Programming in Python 3" by Summerfield.

- Mike


From moradks at gmail.com  Fri May 15 10:42:26 2009
From: moradks at gmail.com (Morad)
Date: Fri, 15 May 2009 07:42:26 -0700 (PDT)
Subject: Can't run PyQt apps with MacPython
References: <25cdb69b-689c-4cfe-a378-3016b3d50e50@s21g2000vbb.googlegroups.com>
	<gufl3t$6t$1@get-news01.get.basefarm.net>
	<ed9257fa-df62-4dbb-b0c5-9129e1c5ffbb@s20g2000vbp.googlegroups.com>
Message-ID: <2fb6276d-761f-4311-bc8d-3868dc7e2a29@z19g2000vbz.googlegroups.com>

On May 15, 10:34?am, Morad <mora... at gmail.com> wrote:
> On May 13, 7:29?pm, David Boddie <da... at boddie.org.uk> wrote:
>
>
>
> > On Wednesday 13 May 2009 17:53, Morad wrote:
>
> > > I recently got a new MacBook Pro with Leopard, and would like to
> > > develop using Python and PyQt. I installed the latest Qt SDK, updated
> > > MacPython to V 2.5.4 and then proceeded to install SIP and PyQt as
> > > described in Mark Summerfield's book on PyQt Programming. Everything
> > > went fine and none of the scripts complained. However when I want to
> > > run a demo app, I get the error message "Fatal Python error:
> > > Interpreter not initialized (version mismatch?) / Abort Trap". Anybody
> > > can help?
>
> > This page suggests a possible conflict between installed Python
> > interpreters:
>
> >http://aralbalkan.com/1675/comment-page-1
>
> > A post to the PyQt mailing list talks about the correct way to build from
> > source, but it may not be relevant in this case:
>
> >http://www.riverbankcomputing.com/pipermail/pyqt/2006-July/013766.html
>
> > It may just be worth checking that SIP and PyQt were built and installed
> > for the interpreter you expected. Failing that, you might want to ask this
> > again on the PyQt mailing list:
>
> >http://www.riverbankcomputing.com/pipermail/pyqt/
>
> > David
>
> Thanks David. What I managed to do as an interim solution is simply to
> remove MacPython and reinstall SIP and PyQt using the default version
> of Python that comes with Apple, and then everything works. Next I
> will retry how to use a more uptodate version, maybe I compiled SIP
> etc. with the wrong version. If I have more questions I will use the
> PyQt mailing list, thanks for the tip!
>
> Morad

Quick update: I now also managed to get things working with a newer
version of MacPython (2.5.4) and everything looks fine. The trick
seems to be that if a terminal window is open prior to the MacPython
install, it will NOT use the new version of python. So one has to
close it and open a new terminal window, and only then should one
compile SIP and PyQt.

Anyway, thanks again for the help.
Morad


From paul at boddie.org.uk  Fri May 15 10:42:29 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Fri, 15 May 2009 07:42:29 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
	<fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com> 
	<d3631430-f8b9-42ce-af42-df4f3c5ef186@o14g2000vbo.googlegroups.com> 
	<ad04c939-ff12-4543-9fc5-8a099e99ed0e@x6g2000vbg.googlegroups.com>
Message-ID: <9b5ecc41-532d-460b-a552-bf99cc9c095d@u10g2000vbd.googlegroups.com>

On 15 Mai, 15:23, "Emanuele D'Arrigo" <man... at gmail.com> wrote:
> Hey Paul,
>
> would you mind continuing this thread on Python + DOM? I'm trying to
> implement a DOM Events-like set of classes and I could use another
> brain that has some familiarity with the DOM to bounce ideas with. If
> you are too busy never mind. Also, I thought of keeping the discussion
> here rather than via email, for the benefit of current and future
> readers.

Sure! Just keep your observations coming! I've made a very lazy
attempt at DOM Events support in libxml2dom, since it looked as if it
might be necessary when providing elementary SVG Tiny support (which
also isn't finished), although I find these things quite hard to
figure out with the usual vagueness of the specifications on certain
crucial implementation-related details (and that there's a mountain of
specifications that one has to navigate).

One of my tests tries to exercise the code, but I might be doing it
all completely wrong:

https://hg.boddie.org.uk/libxml2dom/file/91c0764ac7c6/tests/svg_events.py

It occurs to me that various PyQt- and PyKDE-related bindings might
also provide some exposure to DOM Events, although I had heard that
WebKit, which should have support for lots of DOM features, exposes
some pretty useless interfaces to languages like Python, currently.
The situation with Mozilla and PyXPCOM may well be similar.

Paul


From google at mrabarnett.plus.com  Fri May 15 10:43:27 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 15 May 2009 15:43:27 +0100
Subject: How to catch str exception?
In-Reply-To: <08e5a709-3a67-40fd-9765-8f91d85514a5@j18g2000prm.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>	<mailman.187.1242377429.8015.python-list@python.org>	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>	<mailman.203.1242397029.8015.python-list@python.org>
	<08e5a709-3a67-40fd-9765-8f91d85514a5@j18g2000prm.googlegroups.com>
Message-ID: <4A0D7F8F.2010007@mrabarnett.plus.com>

anuraguniyal at yahoo.com wrote:
>> It would be better to write your own exception class:
>>
>> class MyException(Exception):
>>      pass
> 
> 
> and how would i automatically inject this into 3rd part library

Ah, I wasn't reading carefully enough! :-)


From mrstevegross at gmail.com  Fri May 15 10:50:04 2009
From: mrstevegross at gmail.com (mrstevegross)
Date: Fri, 15 May 2009 07:50:04 -0700 (PDT)
Subject: Import w/ '.' syntax
Message-ID: <c3d94583-60f9-4b1b-8687-74727e2bbbd7@q14g2000vbn.googlegroups.com>

Remind me: is it possible to craft an import statement like this:
  import foo.bar

If so, what's going on here exactly? Is Python looking for a module
called 'bar', in a directory called 'foo', in a search path somewhere?
Or am I totally misunderstanding the import semantics.

Thanks,
--Steve


From jeff at jmcneil.net  Fri May 15 10:59:10 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Fri, 15 May 2009 07:59:10 -0700 (PDT)
Subject: Your Favorite Python Book
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com> 
	<mailman.6.1242078341.8015.python-list@python.org>
Message-ID: <88cb0d42-ae96-4407-a8a6-dcc6e0300e4d@g20g2000vba.googlegroups.com>

On May 11, 5:45?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Mon, May 11, 2009 at 1:44 PM, Sam Tregar <s... at tregar.com> wrote:
> > Greetings.? I'm working on learning Python and I'm looking for good books to
> > read.? I'm almost done with Dive into Python and I liked it a lot. I found
> > Programming Python a little dry the last time I looked at it, but I'm more
> > motivated now so I might return to it.? What's your favorite?? Why?
>
> I like "Python in a Nutshell" as a reference book, although it's now
> slightly outdated given Python 3.0's release (the book is circa 2.5).
>
> Cheers,
> Chris
> --http://blog.rebertia.com

I second this. I've got a small stack of reference books on Python and
this is the most ripped up, coffee-stained, ragged piece of junk I
own. It's even more beat up than my K&R book which I've probably had
four times as long.  Everyone knows that's how you rate your techie
books... the more beat up they are, the higher the quality.

The book is laid out wonderfully.  You've got an tutorial that's
geared towards programmers, language reference, some advanced topics,
and then module reference.

Also, have a look at www.pylonsbook.com once you get the language
down. I've come to like this one as well because you'll also learn a
lot about Python development in general from it. A lot of the
knowledge transfers out of the web development arena into other areas
of programming.





From rustompmody at gmail.com  Fri May 15 11:03:09 2009
From: rustompmody at gmail.com (Rustom Mody)
Date: Fri, 15 May 2009 20:33:09 +0530
Subject: using urlretrive/urlopen
Message-ID: <f46c52560905150803i15ad7968m5fc13738906f8e7d@mail.gmail.com>

I am trying to talk to a server that runs on localhost
The server runs on http://localhost:7000/ and that opens alright in? a
web browser.

However if I use urlopen or urlretrieve what I get is this 'file' --
obviously not the one that the browser gets:

<html><body bgcolor="#ffffff">
Query 'http://localhost:7000/' not implemented
</body></html>
Any tips/clues?

This is python2.6


From jeff at jmcneil.net  Fri May 15 11:20:17 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Fri, 15 May 2009 08:20:17 -0700 (PDT)
Subject: Import w/ '.' syntax
References: <c3d94583-60f9-4b1b-8687-74727e2bbbd7@q14g2000vbn.googlegroups.com>
Message-ID: <ccc3df06-f843-425c-9b26-73f6b109b8fc@o14g2000vbo.googlegroups.com>

On May 15, 10:50?am, mrstevegross <mrstevegr... at gmail.com> wrote:
> Remind me: is it possible to craft an import statement like this:
> ? import foo.bar
>
> If so, what's going on here exactly? Is Python looking for a module
> called 'bar', in a directory called 'foo', in a search path somewhere?
> Or am I totally misunderstanding the import semantics.
>
> Thanks,
> --Steve

In that specific case, you're looking for a module 'bar' in the 'foo'
package, which should be located somewhere on sys.path.

http://docs.python.org/tutorial/modules.html

That covers it pretty well.

Thanks,

Jeff
mcjeff.blogspot.com


From mrstevegross at gmail.com  Fri May 15 11:26:27 2009
From: mrstevegross at gmail.com (mrstevegross)
Date: Fri, 15 May 2009 08:26:27 -0700 (PDT)
Subject: Import w/ '.' syntax
References: <c3d94583-60f9-4b1b-8687-74727e2bbbd7@q14g2000vbn.googlegroups.com>
	<ccc3df06-f843-425c-9b26-73f6b109b8fc@o14g2000vbo.googlegroups.com>
Message-ID: <55daa203-0c7c-4524-8ceb-0ced2ab65b0d@m24g2000vbp.googlegroups.com>

> In that specific case, you're looking for a module 'bar' in the 'foo'
> package, which should be located somewhere on sys.path.
>
> http://docs.python.org/tutorial/modules.html
>
> That covers it pretty well.

Aha! 'packages'! That makes sense.

Thanks,
--Steve


From python at bdurham.com  Fri May 15 11:35:09 2009
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 15 May 2009 11:35:09 -0400
Subject: Case insensitive version of string.Template?
Message-ID: <1242401709.20313.1315649183@webmail.messagingengine.com>

Using Python 2.6 or higher: Is there a way to configure
string.Template() to ignore the case of matched identifiers?
In other words, given the following Template string and
dictionary where all keys are lowercase, is there a way to have
my identifiers expanded based on their lowercase values?
import string
values = dict( name='John Doe', phone='999-555-1212' )
output = string.Template( 'My name is $NAME and my phone is
$Phone.' ).safe_substitute( values )
Thank you,
Malcolm
-------------- next part --------------
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From kyosohma at gmail.com  Fri May 15 11:41:53 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 15 May 2009 08:41:53 -0700 (PDT)
Subject: Your Favorite Python Book
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com> 
	<mailman.6.1242078341.8015.python-list@python.org>
Message-ID: <e1db4ac7-4997-401b-9a1f-112787a9ed92@r3g2000vbp.googlegroups.com>

On May 11, 4:45?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Mon, May 11, 2009 at 1:44 PM, Sam Tregar <s... at tregar.com> wrote:
> > Greetings.? I'm working on learning Python and I'm looking for good books to
> > read.? I'm almost done with Dive into Python and I liked it a lot. I found
> > Programming Python a little dry the last time I looked at it, but I'm more
> > motivated now so I might return to it.? What's your favorite?? Why?
>
> I like "Python in a Nutshell" as a reference book, although it's now
> slightly outdated given Python 3.0's release (the book is circa 2.5).
>
> Cheers,
> Chris
> --http://blog.rebertia.com

I use Hetland's "Beginning Python" and Chun's "Core Python
Programming" the most, although I haven't used them in a while. I also
use Martelli's "Python Cookbook" from time-to-time. Hopefully he will
put out a 3.0 version too.

Mike


From davea at ieee.org  Fri May 15 11:48:02 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 11:48:02 -0400
Subject: How to catch str exception?
In-Reply-To: <bbc8bd2d-c331-4c2d-a2ef-f137c01d25ec@d2g2000pra.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>	<mailman.199.1242393171.8015.python-list@python.org>
	<bbc8bd2d-c331-4c2d-a2ef-f137c01d25ec@d2g2000pra.googlegroups.com>
Message-ID: <4A0D8EB2.2010905@ieee.org>



anuraguniyal at yahoo.com wrote:
>> except TypeError,e:
>>     print "1",e # is caught here
>>
>> 1 exceptions must be classes or instances, not str
>>     
>
> doesn't happen so in 2.5.2
>
>   
I tested it in 2.6.2

Perhaps you could try something like:

try:
    raise "xxx"
except Exception, e:
    print "1",e # is caught here
    ...and then test e.message and reraise if necessary




From mail at timgolden.me.uk  Fri May 15 11:54:58 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 15 May 2009 16:54:58 +0100
Subject: (Windows) Finding out which process has locked a file.
In-Reply-To: <0a981c1d-871b-4917-8fd3-03493d6dbed3@o30g2000vbc.googlegroups.com>
References: <787d6072-3381-40bd-af20-8e1a40405033@h23g2000vbc.googlegroups.com>	<guh02f$re4$2@lust.ihug.co.nz>	<mailman.180.1242355642.8015.python-list@python.org>
	<4191d437-ba03-408b-951f-ca7ec4b49bd7@o30g2000vbc.googlegroups.com>
	<mailman.184.1242373818.8015.python-list@python.org>
	<0a981c1d-871b-4917-8fd3-03493d6dbed3@o30g2000vbc.googlegroups.com>
Message-ID: <4A0D9052.8070906@timgolden.me.uk>

CinnamonDonkey wrote:
> Thanx for the response Tim! :-) Great site!
> 
>  > I'm genuinely surprised to hear you say that...
> 
> Early morning frustration... I appologise to all... you are totally
> right. Thank you to all for the responses.

Well it's big of you to apologise. In return, I've managed to knock
up an example of determining locked file owners. But it is a tad
messy. I'll try to work it up into an annotated example, but for
now it's on pastebin:

  http://python.pastebin.com/m7b4e420a

It manages to mix pywin32, ctypes and wmi over COM via my WMI module.
I may have missed some useful shortcuts but I think it does enough
to illustrate what's going on. It's mostly a translation of a
posting which I'll try to link to when I can find it again, to
give credit where it's due.


> Thanx TJG for the reality check ;-)

Well I hope the above is helpful.

TJG


From pecora at anvil.nrl.navy.mil  Fri May 15 12:05:12 2009
From: pecora at anvil.nrl.navy.mil (Lou Pecora)
Date: Fri, 15 May 2009 12:05:12 -0400
Subject: Your Favorite Python Book
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<mailman.6.1242078341.8015.python-list@python.org>
	<e1db4ac7-4997-401b-9a1f-112787a9ed92@r3g2000vbp.googlegroups.com>
Message-ID: <pecora-532361.12051215052009@ra.nrl.navy.mil>

In article 
<e1db4ac7-4997-401b-9a1f-112787a9ed92 at r3g2000vbp.googlegroups.com>,
 Mike Driscoll <kyosohma at gmail.com> wrote:

> On May 11, 4:45?pm, Chris Rebert <c... at rebertia.com> wrote:

> >
> > I like "Python in a Nutshell" as a reference book, although it's now
> > slightly outdated given Python 3.0's release (the book is circa 2.5).
> >
> > Cheers,
> > Chris

"Python in a Nutshell" -- Absolutely!  Covers a lot in an easily 
accessible way.  The first book I reach for.  I hope Martelli updates it 
to 3.0.

-- 
-- Lou Pecora


From xamalek at yahoo.com  Fri May 15 12:12:24 2009
From: xamalek at yahoo.com (xamalek at yahoo.com)
Date: Fri, 15 May 2009 09:12:24 -0700 (PDT)
Subject: Parsing Strings in Enclosed in Curly Braces
Message-ID: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>

How do you parse a string enclosed in Curly Braces?

For instance:

x = "{ABC EFG IJK LMN OPQ}"

I want to do x.split('{} ') and it does not work. Why does it not work
and what are EXCEPTIONS to using the split method?

That I want to split based on '{', '}' and WHITESPACE.

Please advise.

Regards,
Xav


From xamalek at yahoo.com  Fri May 15 12:15:54 2009
From: xamalek at yahoo.com (xamalek at yahoo.com)
Date: Fri, 15 May 2009 09:15:54 -0700 (PDT)
Subject: Printing a hex character and prefixing it correctly
Message-ID: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>

If I have an integer k, for instance;

k = 32 // BASE 10

How do I get print to print it out in HEX and PREFIXED with 0x? What
is the PROPER WAY?

This does not work:

  print "This is hex 32: ", int(k, 16)

Xav


From clp2 at rebertia.com  Fri May 15 12:19:52 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 15 May 2009 09:19:52 -0700
Subject: Parsing Strings in Enclosed in Curly Braces
In-Reply-To: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
Message-ID: <50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com>

On Fri, May 15, 2009 at 9:12 AM,  <xamalek at yahoo.com> wrote:
> How do you parse a string enclosed in Curly Braces?
>
> For instance:
>
> x = "{ABC EFG IJK LMN OPQ}"
>
> I want to do x.split('{} ') and it does not work. Why does it not work
> and what are EXCEPTIONS to using the split method?

.split() takes a *substring* to split on, *not* a set of individual
characters to split on. Read the Fine Docs.

> That I want to split based on '{', '}' and WHITESPACE.

Well, you could use a regex, or you could just .find() where the
braces are, slice them off the ends of the string, and then split the
result on space.

Cheers,
Chris
-- 
http://blog.rebertia.com


From kyosohma at gmail.com  Fri May 15 12:23:31 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 15 May 2009 09:23:31 -0700 (PDT)
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
Message-ID: <83b69965-bee6-42e7-ac32-e7b7cf4e5617@s21g2000vbb.googlegroups.com>

On May 15, 11:12?am, xama... at yahoo.com wrote:
> How do you parse a string enclosed in Curly Braces?
>
> For instance:
>
> x = "{ABC EFG IJK LMN OPQ}"
>
> I want to do x.split('{} ') and it does not work. Why does it not work
> and what are EXCEPTIONS to using the split method?
>
> That I want to split based on '{', '}' and WHITESPACE.
>
> Please advise.
>
> Regards,
> Xav

The reason it doesn't work is that you don't have a string with "{}".
Instead, you have one of each. If your string was like this, then it
would split:

x = "{} ABC EFG"

In the mean time, you can just use some string slicing like this:

y = x[1:-1]

That will remove the braces and allow you to manipulate the text
therein.

- Mike


From manu3d at gmail.com  Fri May 15 12:27:17 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Fri, 15 May 2009 09:27:17 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
	<fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com> 
	<d3631430-f8b9-42ce-af42-df4f3c5ef186@o14g2000vbo.googlegroups.com> 
	<ad04c939-ff12-4543-9fc5-8a099e99ed0e@x6g2000vbg.googlegroups.com> 
	<9b5ecc41-532d-460b-a552-bf99cc9c095d@u10g2000vbd.googlegroups.com>
Message-ID: <758b4300-b522-40ed-81bf-4cc824284f6c@s31g2000vbp.googlegroups.com>

Hi Paul, thank you for your swift reply!

On May 15, 3:42?pm, Paul Boddie <p... at boddie.org.uk> wrote:
> Sure! Just keep your observations coming! I've made a very lazy
> attempt at DOM Events support in libxml2dom,

I just had a look at libxml2dom, in particular its events.py file.
Given that we are working from a standard your implementation is
exceedingly similar to mine and had I know before I started writing my
own classes I would have started from it instead! =)
Browsing through the code, the EventTarget class docstring reads:

    The listeners for a node are accessed through the global object.
This common
    collection is consequently accessed by all nodes in a document,
meaning that
    distinct objects representing the same node can still obtain the
set of
    listeners registered for that node. In contrast, any attempt to
directly
    store listeners on particular objects would result in the specific
object
    which registered the listeners holding the record of such objects,
whereas
    other objects obtained independently for the same node would hold
no such
    record.

Naively, I implemented my EventTarget class storing its own listeners
rather than global ones. Nevertheless, I'm not quite understanding
this issue. Why shouldn't the listeners be stored directly on the
EventTarget? I have a glimpse of understanding that if the
DOMImplementation keeps EventTarget and Nodes (or Elements? which
entity is supposed to support Events?) separate this might be
necessary. But beside the fact that it's just a fuzzy and potentially
incorrect intuition, I seem to think that the appropriate way to
proceed would be for the DOMImplementation to provide a Node class
that also inherits from EventTarget. In so doing the listeners would
be immediately accessible as soon as one has a handle to a Node.

Furthermore, your code finds the bubbling route with the line:

bubble_route = target.xpath("ancestor::*")

That xpath method is a libxml method right?

> (...) although I find these things quite hard to
> figure out with the usual vagueness of the specifications on certain
> crucial implementation-related details (and that there's a mountain of
> specifications that one has to navigate).

Indeed there is some vagueness in the W3C recommendations and the
various documents offer very little redundancy with each other but
require you to be knowledgeable about them all! I'm managing to piece
together the pieces of the puzzle only after a couple of day having an
in-depth read-through of DOM, DOM Events and a little bit of XML
events to see how it all works in practice. XML events is also what's
prompting me to think that Node/Elements classes of the implementation
should also inherit from EventTarget as they can all be event
targets.

> One of my tests tries to exercise the code, but I might be doing it
> all completely wrong:
>
> https://hg.boddie.org.uk/libxml2dom/file/91c0764ac7c6/tests/svg_event...

Before I can comment I'd like to better understand what you are aiming
for with libxml2dom. It seems to be providing some kind of conversion
services from the xml structure generated by libxml to a dom-like
structure (implemented by pxdom?).
Is that correct?

> It occurs to me that various PyQt- and PyKDE-related bindings might
> also provide some exposure to DOM Events, although I had heard that
> WebKit, which should have support for lots of DOM features, exposes
> some pretty useless interfaces to languages like Python, currently.
> The situation with Mozilla and PyXPCOM may well be similar.

PyKDE is off-limits because it's unix only while I'm trying to be
cross-platform. PyQT is interesting. Very. Further investigation is
required. =)

Manu



From clp2 at rebertia.com  Fri May 15 12:43:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 15 May 2009 09:43:57 -0700
Subject: Printing a hex character and prefixing it correctly
In-Reply-To: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
References: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
Message-ID: <50697b2c0905150943s1c2abbd6l7ee4c3f51d8a7c70@mail.gmail.com>

On Fri, May 15, 2009 at 9:15 AM,  <xamalek at yahoo.com> wrote:
> If I have an integer k, for instance;
>
> k = 32 // BASE 10
>
> How do I get print to print it out in HEX and PREFIXED with 0x? What
> is the PROPER WAY?
>
> This does not work:
>
> ?print "This is hex 32: ", int(k, 16)

print "This is hex 32:", hex(k)

print int("0xA", 16) #==> 10

I would recommend you read the tutorial and/or library reference if
you haven't already.

Cheers,
Chris
-- 
http://blog.rebertia.com


From nonsense at mynonsense.net  Fri May 15 12:45:26 2009
From: nonsense at mynonsense.net (nonsense at mynonsense.net)
Date: Fri, 15 May 2009 09:45:26 -0700 (PDT)
Subject: Autosizing column widths in Excel using win32com.client ?
Message-ID: <f03c4bd7-6250-496c-a58f-c6f09ba724f2@f16g2000vbf.googlegroups.com>

Is there a way to autosize the widths of the excel columns as when you
double click them manually?


From andreas.tawn at ubisoft.com  Fri May 15 12:49:45 2009
From: andreas.tawn at ubisoft.com (Andreas Tawn)
Date: Fri, 15 May 2009 18:49:45 +0200
Subject: Printing a hex character and prefixing it correctly
In-Reply-To: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
References: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
Message-ID: <8AEDA5E3386EA742B8C24C95FF0C758006E7C114@PDC-MAIL3.ubisoft.org>

> If I have an integer k, for instance;
> 
> k = 32 // BASE 10
> 
> How do I get print to print it out in HEX and PREFIXED with 0x? What
> is the PROPER WAY?
> 
> This does not work:
> 
>   print "This is hex 32: ", int(k, 16)
> 
> Xav

k = 32

print "This is hex 32: ", hex(k)

Cheers,

Drea


From nonsense at mynonsense.net  Fri May 15 12:50:03 2009
From: nonsense at mynonsense.net (nonsense at mynonsense.net)
Date: Fri, 15 May 2009 09:50:03 -0700 (PDT)
Subject: Finding location of an executable in a windows machine?
Message-ID: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>

My python script calls another windows program file. I have the path
to that program hardcoded in it. Is there a way for python to
automatically find the path to this program?

testapp_path = "C:\\Program Files\\testapp\\version\\61\\"

Or do i have to do a brute force approach to searching all drives/
folders till it finds a path matching my program name?


From bgeddy at gmail.com  Fri May 15 12:56:24 2009
From: bgeddy at gmail.com (BgEddy)
Date: Fri, 15 May 2009 17:56:24 +0100
Subject: Printing a hex character and prefixing it correctly
References: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
Message-ID: <Y8hPl.126868$y17.112508@newsfe11.ams2>

xamalek at yahoo.com wrote:

> If I have an integer k, for instance;
> 
> k = 32 // BASE 10
> 
> How do I get print to print it out in HEX and PREFIXED with 0x? What
> is the PROPER WAY?
> 
> This does not work:
> 
>   print "This is hex 32: ", int(k, 16)
> 
> Xav

How about this :

k=32
print "This is hex 32: 0x%02X" % k

Kind Regards,
BgEddy



From toby at tobiah.org  Fri May 15 12:57:56 2009
From: toby at tobiah.org (Tobiah)
Date: Fri, 15 May 2009 09:57:56 -0700
Subject: Sorting a dictionary
References: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>
	<mailman.38.1242131009.8015.python-list@python.org>
Message-ID: <pan.2009.05.15.16.57.56.526185@tobiah.org>

On Tue, 12 May 2009 14:17:54 +0200, Jaime Fernandez del Rio wrote:

> This one I think I know... Try with:
> 
> for k in sorted(word_count) :
>     print k,"=",word_count[k]
> 
> You need to do the sorting before iterating over the keys...

Isn't that what's happening here?  I read this as the
'sorted' function iterating over the keys in word_count,
then passing that sorted list to the 'for' loop, for a
second iteration over the sorted pairs.

No?

Tobiah


From jcd at sdf.lonestar.org  Fri May 15 13:20:33 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 15 May 2009 13:20:33 -0400
Subject: Sorting a dictionary
In-Reply-To: <pan.2009.05.15.16.57.56.526185@tobiah.org>
References: <9c8c445f0905120454m757fd35ex64838de9b85bcaf5@mail.gmail.com>
	<mailman.38.1242131009.8015.python-list@python.org>
	<pan.2009.05.15.16.57.56.526185@tobiah.org>
Message-ID: <1242408033.6524.9.camel@aalcdl07>

On Fri, 2009-05-15 at 09:57 -0700, Tobiah wrote:
> On Tue, 12 May 2009 14:17:54 +0200, Jaime Fernandez del Rio wrote:
> 
> > This one I think I know... Try with:
> > 
> > for k in sorted(word_count) :
> >     print k,"=",word_count[k]
> > 
> > You need to do the sorting before iterating over the keys...
> 
> Isn't that what's happening here?  I read this as the
> 'sorted' function iterating over the keys in word_count,
> then passing that sorted list to the 'for' loop, for a
> second iteration over the sorted pairs.
> 
> No?
> 
> Tobiah

The code and the description you are responding to are by the same
poster.  The OP posted something quite different.

@Ronn:

The for statement, which is the line ending with ":" has all the control
over what order elements get processed in.  Compare the following cases:

>>> for x in ['hat', 'socks', 'shirt', 'pants']:
...     print sorted(x)
aht
ckoss
hirst
anpst

In this case, each element of the list gets sorted.  That is, the
letters of each string are put in alphabetical order.  But they are
processed in the order they appeared in the list.  If you want to
process the elements of the list in alphabetical order, you have to sort
the list itself:

>>> for x in sorted(['hat', 'socks', 'shirt', 'pants']):
...     print x
hat
pants
shirt
socks

Cheers,
Cliff





From google at mrabarnett.plus.com  Fri May 15 13:25:55 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 15 May 2009 18:25:55 +0100
Subject: Parsing Strings in Enclosed in Curly Braces
In-Reply-To: <50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com>
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
	<50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com>
Message-ID: <4A0DA5A3.4080203@mrabarnett.plus.com>

Chris Rebert wrote:
> On Fri, May 15, 2009 at 9:12 AM,  <xamalek at yahoo.com> wrote:
>> How do you parse a string enclosed in Curly Braces?
>>
>> For instance:
>>
>> x = "{ABC EFG IJK LMN OPQ}"
>>
>> I want to do x.split('{} ') and it does not work. Why does it not work
>> and what are EXCEPTIONS to using the split method?
> 
> .split() takes a *substring* to split on, *not* a set of individual
> characters to split on. Read the Fine Docs.
> 
>> That I want to split based on '{', '}' and WHITESPACE.
> 
> Well, you could use a regex, or you could just .find() where the
> braces are, slice them off the ends of the string, and then split the
> result on space.
> 
Here's a function which splits on multiple characters:

def split_many(string, delimiters):
     parts = [string]
     for d in delimiters:
         parts = sum((p.split(d) for p in parts), [])
     return parts


From google at mrabarnett.plus.com  Fri May 15 13:32:21 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 15 May 2009 18:32:21 +0100
Subject: Finding location of an executable in a windows machine?
In-Reply-To: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>
References: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>
Message-ID: <4A0DA725.9020109@mrabarnett.plus.com>

nonsense at mynonsense.net wrote:
> My python script calls another windows program file. I have the path
> to that program hardcoded in it. Is there a way for python to
> automatically find the path to this program?
> 
> testapp_path = "C:\\Program Files\\testapp\\version\\61\\"
> 
> Or do i have to do a brute force approach to searching all drives/
> folders till it finds a path matching my program name?

The path to the Python script is given by __file__. If your other
program is in the same folder then you can use:

     other_app_path = os.path.join(os.path.dirname(__file__), 
other_app_name)


From aahz at pythoncraft.com  Fri May 15 13:34:13 2009
From: aahz at pythoncraft.com (Aahz)
Date: 15 May 2009 10:34:13 -0700
Subject: introspection question: get return type
References: <7c0ccb3f-5f8f-45f8-bf49-e6b51d635bf2@t11g2000vbc.googlegroups.com>
	<4a0c6e42$0$12031$426a74cc@news.free.fr>
	<guhsvv$cu$1@panix3.panix.com>
	<4a0d2e07$0$9422$426a74cc@news.free.fr>
Message-ID: <guk92l$gug$1@panix3.panix.com>

In article <4a0d2e07$0$9422$426a74cc at news.free.fr>,
Bruno Desthuilliers  <bruno.42.desthuilliers at websiteburo.invalid> wrote:
>Aahz a ?crit :
>> In article <4a0c6e42$0$12031$426a74cc at news.free.fr>,
>> Bruno Desthuilliers  <bdesth.quelquechose at free.quelquepart.fr> wrote:
>>> Marco Mariani a ?crit :
>>>> Bruno Desthuilliers wrote:
>>>>> Oh, you meant the "return type" ? Nope, no way. It just doesn't make 
>>>>> sense given Python's dynamic typing.
>>>> Unless he's really trying to write in Nohtyp,
>>> You meant "Notype" ?-)
>> 
>> Marco's spelling is correct.  Try "Nohtyp".reverse()
>
>Aazh... I know I'm a bit dumb sometimes, but do you *really* think I had 
>failed to spot this ???

<shrug>  IIRC, English isn't your first language, so I figured better
safe than sorry; humor often mistranslates.  My apologies for casting
aspersions on your linguistic skills.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From davea at ieee.org  Fri May 15 13:49:56 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 13:49:56 -0400
Subject: Printing a hex character and prefixing it correctly
In-Reply-To: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
References: <46686bec-a5d5-4d6c-b19a-00579e286a29@g12g2000prg.googlegroups.com>
Message-ID: <4A0DAB44.2050802@ieee.org>

xamalek at yahoo.com wrote:
> If I have an integer k, for instance;
>
> k = 32 // BASE 10
>
> How do I get print to print it out in HEX and PREFIXED with 0x? What
> is the PROPER WAY?
>
> This does not work:
>
>   print "This is hex 32: ", int(k, 16)
>
> Xav
>
>   
How about
    print "This is hex 32: ", hex(k)


(This works in Python 2.6.2)



From davea at ieee.org  Fri May 15 14:01:18 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 14:01:18 -0400
Subject: Finding location of an executable in a windows machine?
In-Reply-To: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>
References: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>
Message-ID: <4A0DADEE.8060706@ieee.org>

nonsense at mynonsense.net wrote:
> My python script calls another windows program file. I have the path
> to that program hardcoded in it. Is there a way for python to
> automatically find the path to this program?
>
> testapp_path = "C:\\Program Files\\testapp\\version\\61\\"
>
> Or do i have to do a brute force approach to searching all drives/
> folders till it finds a path matching my program name?
>
>
>   
Do you actually need the path, or do you just want the program to run as 
though you had entered it at a command prompt?  Many of the APIs for 
launching other programs will do a path search, similar to what the DOS 
box in Windows does.  Try just leaving off the path entirely.

Or you can get the PATH environment variable, parse it, and search for 
those locations yourself.  But realize that the shell also looks in a 
few places not on the path, including at least  current directory and 
windows directory (eg.  c:\windows\system32 ).  And you very likely want 
to look a few other places, such as in Program Files.

But searching the drives raw is rarely a good idea, as it's quite likely 
there's a duplicate filename out there somewhere, and you want a 
deterministic algorithm for which one will run.

Depending on how fancy your program is, you may want to do the searching 
at install time, and store the result in an xxx.ini file or equivalent.  
That file would probably go somewhere in "Documents and Settings" 
directory structure, perhaps based on the current user.  That way you 
can document how the user will customize it.

If you need help on a specific python command, you'd also need to tell 
us what version of Python you're using.
     print sys.version



From paul at boddie.org.uk  Fri May 15 14:08:11 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Fri, 15 May 2009 11:08:11 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
	<fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com> 
	<d3631430-f8b9-42ce-af42-df4f3c5ef186@o14g2000vbo.googlegroups.com> 
	<ad04c939-ff12-4543-9fc5-8a099e99ed0e@x6g2000vbg.googlegroups.com> 
	<9b5ecc41-532d-460b-a552-bf99cc9c095d@u10g2000vbd.googlegroups.com> 
	<758b4300-b522-40ed-81bf-4cc824284f6c@s31g2000vbp.googlegroups.com>
Message-ID: <d52b1ce8-0ad7-41a3-9edb-eb3ef6ebeb21@b1g2000vbc.googlegroups.com>

On 15 Mai, 18:27, "Emanuele D'Arrigo" <man... at gmail.com> wrote:
>
> I just had a look at libxml2dom, in particular its events.py file.
> Given that we are working from a standard your implementation is
> exceedingly similar to mine and had I know before I started writing my
> own classes I would have started from it instead! =)

Another implementation is probably a good thing, though, since I don't
trust my own interpretation of the specifications. ;-)

> Browsing through the code, the EventTarget class docstring reads:

[Long docstring cut]

> Naively, I implemented my EventTarget class storing its own listeners
> rather than global ones. Nevertheless, I'm not quite understanding
> this issue. Why shouldn't the listeners be stored directly on the
> EventTarget?

One reason for this might well be due to the behaviour of libxml2 and
libxml2dom: if I visit the same node in a document twice, obtaining a
node instance each time, these two instances will be different;
therefore, storing listeners on such instances is not very helpful
because the expectation that you will automatically see previously
added listeners on a node will not generally be fulfilled. With pxdom,
it may be a different situation, but libxml2dom is constrained by the
behaviour of libxml2: I don't attempt to check node equivalence and
then expose the structures representing a single node using a single
object; I generally try and instantiate as few Python objects,
wrapping libxml2 structures, as I can.

> I have a glimpse of understanding that if the
> DOMImplementation keeps EventTarget and Nodes (or Elements? which
> entity is supposed to support Events?) separate this might be
> necessary. But beside the fact that it's just a fuzzy and potentially
> incorrect intuition, I seem to think that the appropriate way to
> proceed would be for the DOMImplementation to provide a Node class
> that also inherits from EventTarget. In so doing the listeners would
> be immediately accessible as soon as one has a handle to a Node.

The libxml2dom.svg module has classes which inherit from EventTarget.
What I've tried to do is to make submodules to address particular
formats and document models.

> Furthermore, your code finds the bubbling route with the line:
>
> bubble_route = target.xpath("ancestor::*")
>
> That xpath method is a libxml method right?

I use libxml2's XPath support exposed via libxml2dom.Node.

> Indeed there is some vagueness in the W3C recommendations and the
> various documents offer very little redundancy with each other but
> require you to be knowledgeable about them all! I'm managing to piece
> together the pieces of the puzzle only after a couple of day having an
> in-depth read-through of DOM, DOM Events and a little bit of XML
> events to see how it all works in practice. XML events is also what's
> prompting me to think that Node/Elements classes of the implementation
> should also inherit from EventTarget as they can all be event
> targets.

I think that if I were to expose an event-capable DOM, other than that
provided for SVG, I would just have a specific submodule for that
purpose.

> > One of my tests tries to exercise the code, but I might be doing it
> > all completely wrong:
>
> >https://hg.boddie.org.uk/libxml2dom/file/91c0764ac7c6/tests/svg_event...
>
> Before I can comment I'd like to better understand what you are aiming
> for with libxml2dom. It seems to be providing some kind of conversion
> services from the xml structure generated by libxml to a dom-like
> structure (implemented by pxdom?).
> Is that correct?

Yes. The aim is to provide a PyXML DOM API on top of libxml2
documents.

Paul


From minesh at gmail.com  Fri May 15 14:09:18 2009
From: minesh at gmail.com (Minesh Patel)
Date: Fri, 15 May 2009 11:09:18 -0700
Subject: ConfigParser and newlines
Message-ID: <b804d5d90905151109j507cc974r8b3e40b225f0ccfa@mail.gmail.com>

I am using ConfigParser to parse a config file and I want to maintain
the newlines, how is it possible. Example given below. BTW, is there
an alternative to configParser, should I use 'exec' instead. Is there
any support for yaml built-in or possibly in the future?

test.cfg
============
[Foo_Section]

BODY = Line of text 1

   Continuing Line of text 1
============

Executing the code
===============
Python 2.5.1 Stackless 3.1b3 060516 (release25-maint, Mar  6 2009, 14:12:34)
[GCC 4.3.0 20080428 (Red Hat 4.3.0-8)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from ConfigParser import RawConfigParser
>>> config = RawConfigParser()
>>> config.read('test.cfg')
['test.cfg']
>>> config.get('Foo_Section', 'BODY')
'Line of text 1\nContinuing Line of text 1'
>>>
===============

I was expecting 'Line of text 1\n\nContinuing Line of text 1'
                                               ^^^^
with 2 newlines, how can I achieve that with ConfigParser.



-- 
Thanks,
./Minesh


From edd at nunswithguns.net  Fri May 15 14:09:45 2009
From: edd at nunswithguns.net (Edd)
Date: Fri, 15 May 2009 11:09:45 -0700 (PDT)
Subject: Appending traceback from exception in child thread
Message-ID: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>

Hi folks,

I have a some threadpool code that works like this :

    tp = ThreadPool(number_of_threads)
    futures = [tp.future(t) for t in tasks] # each task is callable
    for f in futures:
        print f.value() # <-- may propagate an exception

The idea being that a Future object represents a value that may or may
not have been computed yet and the .value() method will block until
that value is ready.

As the comment on the last line indicates, looking at the .value() of
a Future may give the return value of the associated task, or it may
also propagate an exception that was raised in a child thread.

Inside the implementation I store caught exceptions with code that
looks something like:

    try:
        self.return_value = self.task()
    except:
        self.exception = sys.exc_info()[1]

The problem I have is that when an exception is propagated in to the
parent thread by re-raising it, the part of the traceback from the
child thread is lost. So if the program dies due to such an exception,
I can't see what caused it by examining the printed traceback.

To solve this problem, I could of course grab the traceback in the
child thread and create some kind of custom exception that stashes the
trace inside. This could then be caught on the fringes of my code in
order to combine the tracebacks of parent and child together before
printing it. But I was wondering if there might be a nicer way that
keeps the original exception object. Perhaps something akin to gluing
the tracebacks together at the point where the exception is re-raised?

Kind regards,

Edd


From kyosohma at gmail.com  Fri May 15 14:38:16 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 15 May 2009 11:38:16 -0700 (PDT)
Subject: ConfigParser and newlines
References: <mailman.221.1242411274.8015.python-list@python.org>
Message-ID: <72a0ec11-68ee-4a96-84d8-1f23edd92bc5@r13g2000vbr.googlegroups.com>

On May 15, 1:09?pm, Minesh Patel <min... at gmail.com> wrote:
> I am using ConfigParser to parse a config file and I want to maintain
> the newlines, how is it possible. Example given below. BTW, is there
> an alternative to configParser, should I use 'exec' instead. Is there
> any support for yaml built-in or possibly in the future?
>

The primary alternative to ConfigParser is Michael Foord's ConfigObj:

http://www.voidspace.org.uk/python/configobj.html

I don't know if it has yaml support or not though.

Mike


From python.list at tim.thechases.com  Fri May 15 14:45:58 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 15 May 2009 13:45:58 -0500
Subject: ConfigParser and newlines
In-Reply-To: <b804d5d90905151109j507cc974r8b3e40b225f0ccfa@mail.gmail.com>
References: <b804d5d90905151109j507cc974r8b3e40b225f0ccfa@mail.gmail.com>
Message-ID: <4A0DB866.7090008@tim.thechases.com>

> test.cfg
> ============
> [Foo_Section]
> 
> BODY = Line of text 1
> 
>    Continuing Line of text 1
> ============
> 
> Executing the code
> ===============
> Python 2.5.1 Stackless 3.1b3 060516 (release25-maint, Mar  6 2009, 14:12:34)
> [GCC 4.3.0 20080428 (Red Hat 4.3.0-8)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> from ConfigParser import RawConfigParser
>>>> config = RawConfigParser()
>>>> config.read('test.cfg')
> ['test.cfg']
>>>> config.get('Foo_Section', 'BODY')
> 'Line of text 1\nContinuing Line of text 1'
> ===============
> 
> I was expecting 'Line of text 1\n\nContinuing Line of text 1'
>                                                ^^^^
> with 2 newlines, how can I achieve that with ConfigParser.

Not as best I can tell.  From my 
/usr/lib/python2.5/ConfigParser.py file, around line 441:

   if line[0].isspace() and cursect is not None and optname:
     value = line.strip()
     if value:
       cursect[optname] = "%s\n%s" % (cursect[optname], value)

That "value = line.strip()" is what's throwing away your extra 
newline.  Then the "if value" refuses to add the extra newline 
because it was a blank line.  It looks like this behavior was 
intentional?

-tkc








From arkanes at gmail.com  Fri May 15 14:57:59 2009
From: arkanes at gmail.com (Chris Mellon)
Date: Fri, 15 May 2009 13:57:59 -0500
Subject: Appending traceback from exception in child thread
In-Reply-To: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>
References: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>
Message-ID: <4866bea60905151157vfa328fxf4aa59ae1f4c5f5@mail.gmail.com>

On Fri, May 15, 2009 at 1:09 PM, Edd <edd at nunswithguns.net> wrote:
> Hi folks,
>
> I have a some threadpool code that works like this :
>
> ? ?tp = ThreadPool(number_of_threads)
> ? ?futures = [tp.future(t) for t in tasks] # each task is callable
> ? ?for f in futures:
> ? ? ? ?print f.value() # <-- may propagate an exception
>
> The idea being that a Future object represents a value that may or may
> not have been computed yet and the .value() method will block until
> that value is ready.
>
> As the comment on the last line indicates, looking at the .value() of
> a Future may give the return value of the associated task, or it may
> also propagate an exception that was raised in a child thread.
>
> Inside the implementation I store caught exceptions with code that
> looks something like:
>
> ? ?try:
> ? ? ? ?self.return_value = self.task()
> ? ?except:
> ? ? ? ?self.exception = sys.exc_info()[1]
>
> The problem I have is that when an exception is propagated in to the
> parent thread by re-raising it, the part of the traceback from the
> child thread is lost. So if the program dies due to such an exception,
> I can't see what caused it by examining the printed traceback.
>
> To solve this problem, I could of course grab the traceback in the
> child thread and create some kind of custom exception that stashes the
> trace inside. This could then be caught on the fringes of my code in
> order to combine the tracebacks of parent and child together before
> printing it. But I was wondering if there might be a nicer way that
> keeps the original exception object. Perhaps something akin to gluing
> the tracebacks together at the point where the exception is re-raised?
>
> Kind regards,
>
> Edd
> --
> http://mail.python.org/mailman/listinfo/python-list
>


Take a look at the Deferred and Failure objects from Twisted. Deferred
is a deferred result with callback (basically a Future without the
blocking interface), and Failure is an asynchronous exception object.


From kay at fiber-space.de  Fri May 15 15:31:36 2009
From: kay at fiber-space.de (kay at fiber-space.de)
Date: Fri, 15 May 2009 12:31:36 -0700 (PDT)
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
Message-ID: <bf5e536e-c2b5-4b0f-8977-1f9db0daa6e0@x6g2000vbg.googlegroups.com>

On 15 Mai, 18:12, xama... at yahoo.com wrote:
> How do you parse a string enclosed in Curly Braces?
>
> For instance:
>
> x = "{ABC EFG IJK LMN OPQ}"
>
> I want to do x.split('{} ') and it does not work. Why does it not work
> and what are EXCEPTIONS to using the split method?
>
> That I want to split based on '{', '}' and WHITESPACE.
>
> Please advise.
>
> Regards,
> Xav

import string
ttable   = string.maketrans("{} ", "\1\1\1")
print x.translate(ttable).split("\1")   # -> ['', 'ABC', 'EFG', 'IJK',
'LMN', 'OPQ', '']

The validity of the translation+split depends on the presence of \1 in
the original string of course.



From piet at cs.uu.nl  Fri May 15 15:32:47 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 15 May 2009 21:32:47 +0200
Subject: SOAPpy(10060, 'Operation timed out')
References: <mailman.5358.1241924170.11746.python-list@python.org>
Message-ID: <m21vqqgo0w.fsf@cs.uu.nl>

>>>>> "Zhang, Ning" <Ning.Zhang at centrica.com> (ZN) wrote:

>ZN> Hi all
>ZN> I am working for a energy company, we currently want to use api to load
>ZN> data into the database.

>ZN> I am new for soappy package. I have done a bit research on 
>ZN> http://www.ibm.com/developerworks/webse ... #resources
>ZN> <http://www.ibm.com/developerworks/webservices/library/ws-pyth16/#resour
>ces> 
>ZN> and
>ZN> http://www.diveintopython.org/soap_web_ ... gging.html
>ZN> <http://www.diveintopython.org/soap_web_services/debugging.html> 

>ZN> I can make none of the examples from tutorial correct.  

These examples often use short-lived services. When the tutorials are a
couple of years old, the sites disappear and the examples don't work. I
have given a course on distributed object systems the last years and
every few years I have to change the examples because they stop working.

>ZN> I have also tried the the example from Endolith posted last year.

>ZN> viewtopic.php?f=19&t=10038&p=45872&hilit=soap#p45872
>ZN> <http://www.python-forum.org/pythonforum/viewtopic.php?f=19&t=10038&p=45
>ZN> 872&hilit=soap#p45872> 

>ZN> Code: Select all
>ZN> <http://www.python-forum.org/pythonforum/viewtopic.php?f=5&t=12876##>  

>ZN> from SOAPpy import WSDL

>ZN> wsdl_file = 'http://xurrency.com/api.wsdl'
>ZN> server = WSDL.Proxy(wsdl_file)
>ZN> values = server.getValuesInverse('usd')

>ZN> However, I got the error message below:  

>ZN> error: (10060, 'Operation timed out')

This works for me. Could it be that the xurrency.com site was
temporarily down? Or that your company's firewall blocks SOAP calls?
maybe you should ask your network manager.

I used this example in my last lectures and it worked also today:

from SOAPpy import SOAPProxy
url = "http://xurrency.com/servidor_soap.php"
namespace = "http://xurrency.com/api.wsdl"
server = SOAPProxy(url, namespace)
server.config.dumpSOAPOut = True
server.config.dumpSOAPIn = True
print server.getValue(100,"eur","usd")

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From tjreedy at udel.edu  Fri May 15 15:34:38 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 15 May 2009 15:34:38 -0400
Subject: How to catch str exception?
In-Reply-To: <86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
Message-ID: <gukg4d$kb2$2@ger.gmane.org>

anuraguniyal at yahoo.com wrote:
> but the whole point of catching such exception is that i can print its
> value
> there are many such exceptions and hence it is not feasible to catch
> them all or know them all unless i go thru src code.

I think you have discovered why they are gone in Py3 ;-).




From trevor.lango at gmail.com  Fri May 15 15:39:41 2009
From: trevor.lango at gmail.com (Trevor)
Date: Fri, 15 May 2009 12:39:41 -0700 (PDT)
Subject: Tkinter Window On Top
Message-ID: <d5ce72b6-f1f7-42fb-b80e-9f65a6a3a39a@18g2000prx.googlegroups.com>

Can a Tkinter application create a COM object and keep its own window
on top of it?

excel = win32com.client.Dispatch('Excel.Application')

I would like the user to be able to see and interact with the Excel
application but keep the Tkinter application on top.


From tjreedy at udel.edu  Fri May 15 15:59:35 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 15 May 2009 15:59:35 -0400
Subject: Finding location of an executable in a windows machine?
In-Reply-To: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>
References: <3c292072-74d7-4468-80df-4090ffc11739@r36g2000vbr.googlegroups.com>
Message-ID: <gukhj8$p1h$1@ger.gmane.org>

nonsense at mynonsense.net wrote:
> My python script calls another windows program file. I have the path
> to that program hardcoded in it. Is there a way for python to
> automatically find the path to this program?
> 
> testapp_path = "C:\\Program Files\\testapp\\version\\61\\"
> 
> Or do i have to do a brute force approach to searching all drives/
> folders till it finds a path matching my program name?

Program Files directories are usually not part of the PATH environment 
variable.  A main program in Program Files is generally started by 
clicking on: an icon that points to it, an entry in Start Menu, its 
directory listing in Explorer, or a file whose extension is associated 
with it.  A subsidiary program is started by a main program that knows 
where is it in relation to the main program.

If a program is registered when installed, then there will be a registry 
key that is the same for all installations that points to its 
installation-specific location.  Python on Windows comes with a winreg 
module for accessing the registry.  You just need to find the key, 
possibly using the regedit utility and its search function.

Terry Jan Reedy



From __peter__ at web.de  Fri May 15 16:01:18 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 15 May 2009 22:01:18 +0200
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
	<bf5e536e-c2b5-4b0f-8977-1f9db0daa6e0@x6g2000vbg.googlegroups.com>
Message-ID: <gukhm3$flj$02$1@news.t-online.com>

kay at fiber-space.de wrote:

> ttable   = string.maketrans("{} ", "\1\1\1")
> print x.translate(ttable).split("\1")   # -> ['', 'ABC', 'EFG', 'IJK',
> 'LMN', 'OPQ', '']
> 
> The validity of the translation+split depends on the presence of \1 in
> the original string of course.

Keep one of the splitting characters to avoid that (theoretical) risk:

ttable = string.maketrans("{} ", "{{{")

Peter



From http  Fri May 15 16:36:26 2009
From: http (Paul Rubin)
Date: 15 May 2009 13:36:26 -0700
Subject: How to catch str exception?
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
Message-ID: <7xeiuqkss5.fsf@ruckus.brouhaha.com>

"anuraguniyal at yahoo.com" <anuraguniyal at yahoo.com> writes:
> there are many such exceptions and hence it is not feasible to catch
> them all or know them all unless i go thru src code.

But that is true of all exceptions.  The alternative seems to be a
"checked exception" scheme like Java's, which in practice imposes a
huge pain on programmers, who have to modify type signatures all up
and down the call hierarchy every time they raise another exception at
the bottom level.


From google at mrabarnett.plus.com  Fri May 15 16:50:12 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 15 May 2009 21:50:12 +0100
Subject: How to catch str exception?
In-Reply-To: <7xeiuqkss5.fsf@ruckus.brouhaha.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>	<mailman.187.1242377429.8015.python-list@python.org>	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
	<7xeiuqkss5.fsf@ruckus.brouhaha.com>
Message-ID: <4A0DD584.7080800@mrabarnett.plus.com>

Paul Rubin wrote:
> "anuraguniyal at yahoo.com" <anuraguniyal at yahoo.com> writes:
>> there are many such exceptions and hence it is not feasible to catch
>> them all or know them all unless i go thru src code.
> 
> But that is true of all exceptions.  The alternative seems to be a
> "checked exception" scheme like Java's, which in practice imposes a
> huge pain on programmers, who have to modify type signatures all up
> and down the call hierarchy every time they raise another exception at
> the bottom level.

I would've thought that a modern IDE would do a lot of the work for you.


From eye.zak.devel at gmail.com  Fri May 15 16:58:55 2009
From: eye.zak.devel at gmail.com (eye zak)
Date: Fri, 15 May 2009 16:58:55 -0400
Subject: How do i generate a tuple from a generator ?
Message-ID: <e9465b660905151358o1e0d15d3ve8dc447f634f98b@mail.gmail.com>

Hi,

I have a situation where i want a tuple from a generator/sequence
comprehension.
I am wondering, is this possible ? or is this just a bad idea all together?

class iterator(object):
    __slots__ = ('__iters',)

    def __init__(self,*args):
        assert len(args) != 0
        self.__iters = tuple( __builtins__.iter(arg) for arg in args )

    def __iter__(self,*args):
        return self

    def next(self):
        return [ i.next() for i in self.__iters ]    # HERE I WANT A TUPLE

This can also be accomplished with a generator function, but requires
while True loop. is that better ?

Isaac


From emile at fenx.com  Fri May 15 17:03:31 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 15 May 2009 14:03:31 -0700
Subject: How do i generate a tuple from a generator ?
In-Reply-To: <e9465b660905151358o1e0d15d3ve8dc447f634f98b@mail.gmail.com>
References: <e9465b660905151358o1e0d15d3ve8dc447f634f98b@mail.gmail.com>
Message-ID: <guklb9$475$1@ger.gmane.org>

On 5/15/2009 1:58 PM eye zak said...
> Hi,
> 
> I have a situation where i want a tuple from a generator/sequence
> comprehension.
> I am wondering, is this possible ? or is this just a bad idea all together?
> 
> class iterator(object):
>     __slots__ = ('__iters',)
> 
>     def __init__(self,*args):
>         assert len(args) != 0
>         self.__iters = tuple( __builtins__.iter(arg) for arg in args )
> 
>     def __iter__(self,*args):
>         return self
> 
>     def next(self):
>         return [ i.next() for i in self.__iters ]    # HERE I WANT A TUPLE
           return tuple(...)
Emile

> 
> This can also be accomplished with a generator function, but requires
> while True loop. is that better ?
> 
> Isaac



From norseman at hughes.net  Fri May 15 17:17:36 2009
From: norseman at hughes.net (norseman)
Date: Fri, 15 May 2009 14:17:36 -0700
Subject: Just wondering
In-Reply-To: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>
References: <12a9ce560905150456h1351347ehdbbb04bb2ba66d55@mail.gmail.com>
Message-ID: <4A0DDBF0.6030709@hughes.net>

Gediminas Kregzde wrote:
> Hello,
> 
> I'm Vilnius college II degree student and last semester our teacher
> introduced us to python
> I've used to program with Delphi, so I very fast adopted to python
> 
> Now I'm developing cross platform program and use huge amounts of
> data. Program is needed to run as fast as it coud. I've read all tips
> about geting performance, but got 1 bug: map function is slower than
> for loop for about 5 times, when using huge amounts of data.
> It is needed to perform some operations, not to return data.
> 
> I'm adding sample code:
> from time import time
> 
> def doit(i):
>    pass
> 
> def main():
>    a = [0] * 10000000
>    t = time()
>    map(doit, a)
>    print "map time: " + str(time() - t)
> 
> def main2():
>    t = time()
>    a = [0] * 10000000
>    for i in a:
>        pass
>    print "loop time: " + str(time() - t)
> 
> main()  # takes approximately 5x times longer than main2()
> main2()
> 
> I'm wondering were is catch?
> 
> I'm using python 2.6 on windows xp sp2 machine
> 
> P.S. Sorry for my broken English
===============================

cut n paste done


Using Laptop at 2.4 GHz
map time:  4.9281001091               map/loop = 5.7554...
loop time: 0.856245994568

Using Desktop at 3.1 GHz
map time: 3.46799993515               map/loop = 7.6556...
loop time: 0.453000068665


Yep - map is way slower

Your English is good enough for me to understand. What more is needed?
:)

Someone writing Python can probably say why.

Steve



From norseman at hughes.net  Fri May 15 17:20:40 2009
From: norseman at hughes.net (norseman)
Date: Fri, 15 May 2009 14:20:40 -0700
Subject: Just wondering
In-Reply-To: <Q6dPl.15964$Ux.11735@tornado.fastwebnet.it>
References: <mailman.188.1242388571.8015.python-list@python.org>
	<Q6dPl.15964$Ux.11735@tornado.fastwebnet.it>
Message-ID: <4A0DDCA8.3020806@hughes.net>

Marco Mariani wrote:
> Gediminas Kregzde wrote:
> 
> 
>> def doit(i):
>>    pass
>>
>> def main():
>>    a = [0] * 10000000
>>    t = time()
>>    map(doit, a)
>>    print "map time: " + str(time() - t)
> 
> Here you are calling a function ten million times, build a list with of 
> ten million None results, then throw it away.
> 
> 
>> def main2():
>>    t = time()
>>    a = [0] * 10000000
>>    for i in a:
>>        pass
>>    print "loop time: " + str(time() - t)
> 
> Here you do nothing but iterating 'i' over the 'a' list.
> 
> 
>> main()  # takes approximately 5x times longer than main2()
>> main2()
>>
>> I'm wondering were is catch?
> 
> Function calls are not free in python. They cost a lot more than they do 
> in C, Delphi or other languages.
> 

Gediminas - You did a good job of testing the overhead.  All good 
programmers do that!

Steve


From minesh at gmail.com  Fri May 15 17:31:35 2009
From: minesh at gmail.com (Minesh Patel)
Date: Fri, 15 May 2009 14:31:35 -0700
Subject: ConfigParser and newlines
In-Reply-To: <4A0DB866.7090008@tim.thechases.com>
References: <b804d5d90905151109j507cc974r8b3e40b225f0ccfa@mail.gmail.com>
	<4A0DB866.7090008@tim.thechases.com>
Message-ID: <b804d5d90905151431y75db4320p60cd3798dd245493@mail.gmail.com>

> Not as best I can tell. ?From my /usr/lib/python2.5/ConfigParser.py file,
> around line 441:
>
> ?if line[0].isspace() and cursect is not None and optname:
> ? ?value = line.strip()
> ? ?if value:
> ? ? ?cursect[optname] = "%s\n%s" % (cursect[optname], value)
>
> That "value = line.strip()" is what's throwing away your extra newline.
> ?Then the "if value" refuses to add the extra newline because it was a blank
> line. ?It looks like this behavior was intentional?
>

Is that a bug? What would be the use cases for stripping newlines
unnecessarily. Seems like the configParser is trying to be too clever.

-- 
Thanks,
./Minesh


From ebonak at hotmail.com  Fri May 15 17:32:57 2009
From: ebonak at hotmail.com (Esmail)
Date: Fri, 15 May 2009 17:32:57 -0400
Subject: ConfigParser examples?
Message-ID: <gukn24$a47$1@ger.gmane.org>

Hi all,

Can anyone point to on the web, or possibly share a simple example
of the use of the ConfigParser module?

I have a program that has a lot of flags in various places (yes,
ugly I know), so I am trying to consolidate this information in
a configuration file so that the program can pull the necessary
information from this place without the need to edit the program
and its flags.

Some sample code for using ConfigParser would be helpful - haven't
been able to find any on-line so far beyond the standard documentation.

Thanks,
Esmail



From sjmachin at lexicon.net  Fri May 15 17:58:41 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 15 May 2009 14:58:41 -0700 (PDT)
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
	<50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com> 
	<mailman.216.1242408349.8015.python-list@python.org>
Message-ID: <180531ca-33aa-47b9-9c69-5b5973f6b6f9@v35g2000pro.googlegroups.com>

On May 16, 3:25?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> Chris Rebert wrote:
> > On Fri, May 15, 2009 at 9:12 AM, ?<xama... at yahoo.com> wrote:
> >> How do you parse a string enclosed in Curly Braces?
>
> >> For instance:
>
> >> x = "{ABC EFG IJK LMN OPQ}"
>
> >> I want to do x.split('{} ') and it does not work. Why does it not work
> >> and what are EXCEPTIONS to using the split method?
>
> > .split() takes a *substring* to split on, *not* a set of individual
> > characters to split on. Read the Fine Docs.
>
> >> That I want to split based on '{', '}' and WHITESPACE.
>
> > Well, you could use a regex, or you could just .find() where the
> > braces are, slice them off the ends of the string, and then split the
> > result on space.
>
> Here's a function which splits on multiple characters:
>
> def split_many(string, delimiters):
> ? ? ?parts = [string]
> ? ? ?for d in delimiters:
> ? ? ? ? ?parts = sum((p.split(d) for p in parts), [])
> ? ? ?return parts

Neat trick. However, from 2.6.2:

>>> help(sum)
Help on built-in function sum in module __builtin__:

sum(...)
    sum(sequence[, start]) -> value

    Returns the sum of a sequence of numbers (NOT strings) plus the
value
    of parameter 'start' (which defaults to 0).  When the sequence is
    empty, returns start.

Since when is a list a number? Perhaps the help needs clarification,
in line with the docs.

Cheers,
John


From cs at zip.com.au  Fri May 15 17:59:05 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Sat, 16 May 2009 07:59:05 +1000
Subject: How to catch str exception?
In-Reply-To: <7xeiuqkss5.fsf@ruckus.brouhaha.com>
Message-ID: <20090515215905.GA823@cskk.homeip.net>

On 15May2009 13:36,  <> wrote:
| "anuraguniyal at yahoo.com" <anuraguniyal at yahoo.com> writes:
| > there are many such exceptions and hence it is not feasible to catch
| > them all or know them all unless i go thru src code.
| 
| But that is true of all exceptions.  The alternative seems to be a
| "checked exception" scheme like Java's, which in practice imposes a
| huge pain on programmers, who have to modify type signatures all up
| and down the call hierarchy every time they raise another exception at
| the bottom level.

I used to think that too, but it's not entirely true.

Aside: I loved the discipline that comes with Java's interface strictness
but found the language felt cumbersome; Python's duck typing approach
is far simpler to work with but lets you be a lot sloppier because many
implementation shortcomings will only show at runtime, whereas Java's
rigidity can be used to catch a lot of stuff at compile time.

Anyway, to the exception thing: if you're throwing a "new" type of
exception then either you've changes the object model and Java rightly
complains, if you're breaking the object encapsulation and you should
be catching the new exceptions fairly low down and either handling it or
raising a "conformant" exception the caller expected. This isually happens
across a type boundary; for example a data structure that just happens to
use an SQL db for backing structure should be catching any SQL exceptions
and recasting them to an appropriate outer exception for the user,
probably inserting the underlying SQL exception into the new exception
as an attribute.

Anyway, my basic point here is that the asserting that your have to
"modify type signatures all up and down the call hierarchy every time they
raise another exception" should have a fairly limited scope. Unexpected
exceptions _shouldn't_ be happening. We routinely write stuff like:

  try:
    n = int(foo)
  except ValueError, e:
    print >>sys.stderr, "not an integer: %s" % foo

If int() starts throwing non-ValueError exceptions then many many
programs break. Java would prevent one from changing int() in such
a fashion outright. Python requires the self-discipline on the part of
the implementer of int() to raise only ValueError exceptions, and
internally handle anything else at a lower level.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Widget. It's got a widget. A lovely widget. A widget it has got.
        - Jack Dee


From DustanGroups at gmail.com  Fri May 15 17:59:12 2009
From: DustanGroups at gmail.com (Dustan)
Date: Fri, 15 May 2009 14:59:12 -0700 (PDT)
Subject: Photoimage on button appears pixelated when button is disabled
Message-ID: <fb96adf5-28cd-4493-8070-993f30f1d78e@v4g2000vba.googlegroups.com>

In tkinter, when I place a photoimage on a button and disable the
button, the image has background dots scattered through the image.
Searching the web, I wasn't able to find any documentation on this
behavior, nor how to turn it off. So here I am. How do I keep this
from happening?

Also, how can I extract the base-64 encoding of a GIF, so I can put
the image directly into the code instead of having to keep a separate
file for the image?

All responses appreciated,
Dustan


From rhodri at wildebst.demon.co.uk  Fri May 15 18:01:27 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 15 May 2009 23:01:27 +0100
Subject: How to catch str exception?
In-Reply-To: <62c75d3a-fe31-4b91-b493-58f2d53c105a@k19g2000prh.googlegroups.com>
References: <6886caf5-fbf0-4910-8f54-645f3d83a2e6@d7g2000prl.googlegroups.com>
	<mailman.187.1242377429.8015.python-list@python.org>
	<86c05935-5c60-423f-b383-8823b5f6d223@18g2000prx.googlegroups.com>
	<gujdm7$cip$01$1@news.t-online.com>
	<62c75d3a-fe31-4b91-b493-58f2d53c105a@k19g2000prh.googlegroups.com>
Message-ID: <op.utzrgpuma8ncjz@gnudebst>

On Fri, 15 May 2009 12:50:59 +0100, anuraguniyal at yahoo.com  
<anuraguniyal at yahoo.com> wrote:

>
>> try:
>> ? ? raise "abc"
>> except:
>> ? ? e, t, tb = sys.exc_info()
>> ? ? if not isinstance(e, str):
>> ? ? ? ? raise
>> ? ? print "caught", e
>
> This seems to be the solution, thanks

Do be aware that string exceptions are going away, so at
some point you're going to upgrade your version of Python
and your scripts will mysteriously stop working.  Peter's
patch will help you for now, but it's a double-edged sword
in that it also lets you pretend that you don't have to
fix the problem properly later.  In my experience it's
generally best to fix the problem now rather than paper
over the cracks.

Since this is a third-party library doing this, as far as
I can see it you have three choices:

1) Get hold of a more up-to-date version of the module,
if there is one.

2) Ask the module writers nicely to fix the problem.

3) Fix it yourself.

The beauty of Python is that 3) isn't all that hard!

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From socyl at 987jk.com.invalid  Fri May 15 18:12:06 2009
From: socyl at 987jk.com.invalid (kj)
Date: Fri, 15 May 2009 22:12:06 +0000 (UTC)
Subject: How to get the formal args of a function object?
References: <guhrjb$79i$1@reader1.panix.com>
	<mailman.162.1242334673.8015.python-list@python.org>
Message-ID: <gukpbm$sbh$1@reader1.panix.com>

In <mailman.162.1242334673.8015.python-list at python.org> Chris Rebert <clp2 at rebertia.com> writes:

>Take a look at inspect.getargspec(func):
>http://docs.python.org/library/inspect.html#inspect.getargspec

Thank you much, that did the trick.  And inspect is a very handy
module to know about.

kynn
-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From rhodri at wildebst.demon.co.uk  Fri May 15 18:18:14 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 15 May 2009 23:18:14 +0100
Subject: Parsing Strings in Enclosed in Curly Braces
In-Reply-To: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
Message-ID: <op.utzr8od5a8ncjz@gnudebst>

On Fri, 15 May 2009 17:12:24 +0100, <xamalek at yahoo.com> wrote:

> How do you parse a string enclosed in Curly Braces?
>
> For instance:
>
> x = "{ABC EFG IJK LMN OPQ}"
>
> I want to do x.split('{} ') and it does not work. Why does it not work
> and what are EXCEPTIONS to using the split method?

Other people have already done this bit :-)

> That I want to split based on '{', '}' and WHITESPACE.

This is not the same as what you first said, and I have a horrid feeling
you're trying to conflate two steps into one.  That way lies madness.

First, a question.  Is 'x' truly a good representation of your original
data?  Could it instead look more like:

x = "Ignore this {but not this} and completely forget about this"

Can you have braces legitmately lying around in the string, escaped
somehow:

x = r"{Parse including the \} escaped close brace}"

Can you have nested braces, and what are you supposed to do with them:

x = "{Some text to parse {as well as an aside} and so on}"

Parsing is not an entirely trivial subject, particularly when users
can futz about with the strings you're parsing.  That's one reason there
are so many lexers and parsers out there!

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From socyl at 987jk.com.invalid  Fri May 15 18:20:41 2009
From: socyl at 987jk.com.invalid (kj)
Date: Fri, 15 May 2009 22:20:41 +0000 (UTC)
Subject: Need advice on distributing small module
References: <guhuqf$h3u$1@reader1.panix.com>
	<99246143-a853-4041-bc45-eeb648388cc4@r3g2000vbp.googlegroups.com>
Message-ID: <gukprp$kf3$1@reader1.panix.com>

In <99246143-a853-4041-bc45-eeb648388cc4 at r3g2000vbp.googlegroups.com> Carl Banks <pavlovevidence at gmail.com> writes:

>On May 14, 1:26=A0pm, kj <so... at 987jk.com.invalid> wrote:
>> I've written a tiny module that I'd like to make available online
>> from my website. =A0This module is not "production-grade" code; it
>> is meant only as an illustration, but still I'd like to make its
>> download and installation as painless as possible.
>>
>> I could simply bundle everything into a .tgz file, but I'd like
>> the distribution to conform to the expectations of Python users,
>> as far as the installation sequence is concerned. =A0I'm fairly new
>> to Python, and would appreciate your advice on this last point.

>First of all, if it's just a single module, I recommend that one of
>the options is to allow the file to be downloaded as-is, with no
>packaging, because a lot of Python users would find it least
>cumbersome to simply drop the file right into the site-packages
>directory.  The README file would be a separate download or just a
>page on the website.

>For more official-looking packages, you want to create a setup.py file
>that lists your module's build information and meta-information.  Read
>the section of the Python documentation entitled "Distributing Python
>Modules" for information on how to write a setup file.  Once you write
>it, you can run python setup.py sdist and it'll build a distrribution
>for you.


>> The module has only one non-standard dependency, described by the
>> following code:
>>
>> if sys.version_info[:2] >=3D (2, 6):
>> =A0 =A0 import json
>> else:
>> =A0 =A0 import simplejson as json
>>
>> If possible, I'd like to make distribution procedure such that if
>> necessary it also installs json or simplejson (as the case may be).

>Next recommendation: just tell your users to download and install json
>if they want to use the module.  A small demo module shouldn't be
>taking the initiative to install a fairly large package on the user's
>behalf.

>Furthermore, some users have extreme hatred for software that
>"helpfully" downloads and installs other packages without asking
>first.

>If you want to proceed along these lines in spite of this, the way to
>do it is to add some information to setup.py that lists dependencies.
>There is a script, easy_install.py, that uses this information to
>install dependencies automatically.  However, I don't know the details
>of how to do that.


Thanks, that's very useful advice.

kynn

-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From sridharr at activestate.com  Fri May 15 18:28:49 2009
From: sridharr at activestate.com (Sridhar Ratnakumar)
Date: Fri, 15 May 2009 15:28:49 -0700
Subject: ANN: ActivePython 2.6.2.2, 3.1.0b1.0, 2.5.4.4 is now available
Message-ID: <4A0DECA1.1090002@activestate.com>

I'm happy to announce that ActivePython 2.6.2.2, 3.1.0b1.0 and 2.5.4.4
are now available for download from:

     http://www.activestate.com/activepython/

This is a patch release that updates ActivePython to core Python 2.6.2
and 3.1b2.  This release also contains updates to Tcl/Tk 8.5.7 and Tix
8.4.3. We recommend that you try 2.6 version first. See the release
notes for full details:

     http://docs.activestate.com/activepython/2.6/relnotes.html


What is ActivePython?
---------------------

ActivePython is ActiveState's binary distribution of Python. Builds
for Windows, Mac OS X, Linux, HP-UX and AIX are made freely available.

ActivePython includes the Python core and the many core extensions:
zlib and bzip2 for data compression, the Berkeley DB (bsddb) and
SQLite (sqlite3) database libraries, OpenSSL bindings for HTTPS
support, the Tix GUI widgets for Tkinter, ElementTree for XML
processing, ctypes (on supported platforms) for low-level library
access, and others. The Windows distribution ships with PyWin32 -- a
suite of Windows tools developed by Mark Hammond, including bindings
to the Win32 API and Windows COM. See this page for full details:

     http://docs.activestate.com/activepython/2.6/whatsincluded.html

As well, ActivePython ships with a wealth of documentation for both
new and experienced Python programmers. In addition to the core Python
docs, ActivePython includes the "What's New in Python" series, "Dive
into Python", the Python FAQs & HOWTOs, and the Python Enhancement
Proposals (PEPs).

An online version of the docs can be found here:

     http://docs.activestate.com/activepython/2.6/

We would welcome any and all feedback to:

     ActivePython-feedback at activestate.com

Please file bugs against ActivePython at:

     http://bugs.activestate.com/query.cgi?set_product=ActivePython


On what platforms does ActivePython run?
----------------------------------------

ActivePython includes installers for the following platforms:

- Windows/x86
- Windows/x64 (aka "AMD64")
- Mac OS X
- Linux/x86
- Linux/x86_64 (aka "AMD64")
- Solaris/SPARC
- Solaris/x86
- HP-UX/PA-RISC
- AIX/PowerPC


Extra Bits
----------

ActivePython releases also include the following:

- ActivePython26.chm: An MS compiled help collection of the full
   ActivePython documentation set. Linux users of applications such as
   xCHM might find this useful. This package is installed by default on
   Windows.

Extra bits are available from:

     http://downloads.activestate.com/ActivePython/etc/
	

Thanks, and enjoy!

The Python Team

--
Sridhar Ratnakumar
sridharr at activestate.com


From rhodri at wildebst.demon.co.uk  Fri May 15 18:39:26 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 15 May 2009 23:39:26 +0100
Subject: python
In-Reply-To: <629cf901-516f-4888-90c5-d6174bdf9b5e@r3g2000vbp.googlegroups.com>
References: <629cf901-516f-4888-90c5-d6174bdf9b5e@r3g2000vbp.googlegroups.com>
Message-ID: <op.utzs70qaa8ncjz@gnudebst>

On Fri, 15 May 2009 14:58:16 +0100, <anica_1069 at hotmail.com> wrote:

> hello, I?m a student of linguistic an I need do this exercises. Can
> anybody help me,please?
> Thanks

Sorry, we're allergic to homework.  If you've got any more specific
questions about how bits of Python work, do ask, but don't ask us to
do your assignments for you.  Most tutors can get downright unreasonable
about that sort of thing.

> ? Read in some text from a corpus, tokenize it, and print the list of
> all wh-word types that occur. (wh-words in English are used in
> questions, relative clauses and exclamations: who, which, what, and so
> on.) Print them in order. Are any words duplicated in this list,
> because of the presence of case distinctions or punctuation?

Some questions you should already have the answers to:

* How do you identify wh-words?  I'm guessing for the purposes of
this assignment you've got a list of them.  If that's so, look up the
bit of the tutorial about finding out whether something is in a list.
If you have to parse for them, that's a rather harder problem.

* ...but beware of case distinctions -- look up the string methods to
see how to play with the case of a string.

* Tokenizing the string is just a matter of splitting it up where there
are spaces or punctuation.  Funnily enough, there's this string method
called "split()" that will do this.

* What does "in order" mean?  In the order in which they occur in the
corpus?  In alphabetical order?  If it's the latter, you'll need to
record the wh-words when they occur in a list and sort it at the end
before printing it out.

> ? Create a file consisting of words and (made up) frequencies, where
> each line consists of a word, the space character, and a positive
> integer, e.g. fuzzy 53. Read the file into a Python list using open
> (filename).readlines(). Next, break each line into its two fields
> using split(), and convert the number into an integer using int(). The
> result should be a list of the form: [['fuzzy', 53], ...].

So you do that.  Seriously, this is a pretty complete recipe already.
If you can't see how to do it, re-read the tutorial.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From martin at v.loewis.de  Fri May 15 18:50:53 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 16 May 2009 00:50:53 +0200
Subject: Configure options for minimal Python 2.6
In-Reply-To: <mailman.192.1242390533.8015.python-list@python.org>
References: <mailman.192.1242390533.8015.python-list@python.org>
Message-ID: <4a0df1cd$0$24061$9b622d9e@news.freenet.de>

> I want to compile a minimal Python 2.6 for Debian Etch without support
> for optional features such as tk and sphinx.  The configure script's
> help says that features can be disabled with an '--without-PACKAGE', so
> I guess disabling tk is '--without-tk', but where is there a list of the
> feature/package names of the other optional components?

To disable extension modules, there is actually nothing that you have to
do. By default, they will not get compiled into the interpreter, anyway.

A few modules to become builtin; check Modules/Setup* to remove any that
you don't want.

configure --help gives you a complete list of all supported parameters
already.

Regards,
Martin


From davea at ieee.org  Fri May 15 19:54:40 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 15 May 2009 19:54:40 -0400
Subject: Just wondering
In-Reply-To: <4A0DDCA8.3020806@hughes.net>
References: <mailman.188.1242388571.8015.python-list@python.org>	<Q6dPl.15964$Ux.11735@tornado.fastwebnet.it>
	<4A0DDCA8.3020806@hughes.net>
Message-ID: <4A0E00C0.7090908@ieee.org>

norseman wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">Marco 
> Mariani wrote:
>> Gediminas Kregzde wrote:
>>
>>
>>> def doit(i):
>>>    pass
>>>
>>> def main():
>>>    a = [0] * 10000000
>>>    t = time()
>>>    map(doit, a)
>>>    print "map time: " + str(time() - t)
>>
>> Here you are calling a function ten million times, build a list with 
>> of ten million None results, then throw it away.
>>
>>
>>> def main2():
>>>    t = time()
>>>    a = [0] * 10000000
>>>    for i in a:
>>>        pass
>>>    print "loop time: " + str(time() - t)
>>
>> Here you do nothing but iterating 'i' over the 'a' list.
>>
>>
>>> main()  # takes approximately 5x times longer than main2()
>>> main2()
>>>
>>> I'm wondering were is catch?
>>
>> Function calls are not free in python. They cost a lot more than they 
>> do in C, Delphi or other languages.
>>
>
> Gediminas - You did a good job of testing the overhead.  All good 
> programmers do that!
>
> Steve
>
>
If the task is to test the overhead, then the two loops need to be 
equivalent.  The OP's conclusion, confirmed by many of you, is that 
map() is lots slower than for.  But if you add in the call overhead in 
the for loop, they come out within 2 percent.  If you just want to 
compare map() time to for time, use functions:

from time import time
def doit(i):
   pass
def main():
   a = [0] * 10000000
   t = time()
   map(doit, a)
   print "map time: " + str(time() - t)

def main2():
   a = [0] * 10000000
   t = time()
   for i in a:
       doit(i)
   print "loop time: " + str(time() - t)


main()
main2()

gives:
map time: 4.875
loop time: 4.79600000381



From gagsl-py2 at yahoo.com.ar  Fri May 15 20:01:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 15 May 2009 21:01:41 -0300
Subject: KeyboardInterrupt catch does not shut down the socketserver
References: <mailman.183.1242371089.8015.python-list@python.org>
	<guj8dv$5sl$2@lust.ihug.co.nz>
	<mailman.185.1242375959.8015.python-list@python.org>
	<gujl41$d0r$2@lust.ihug.co.nz> <4A0D5A35.3010008@gmail.com>
Message-ID: <op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 09:04:05 -0300, Igor Katson escribi?:
> Lawrence D'Oliveiro wrote:
>> In message <mailman.185.1242375959.8015.python-list at python.org>, Igor  
>> Katson wrote:
>>> Lawrence D'Oliveiro wrote:
>>>> In message <mailman.183.1242371089.8015.python-list at python.org>, Igor  
>>>> Katson wrote:
>>>>
>>>>> I have problems in getting a SocketServer to shutdown.
>>>>>
>>>> Do you want to do a shutdown or a close?
>>>>
>>> I want the server close the socket ...
>>>
>>
>> You want to do a close, do a close, not a shutdown  
>> <http://docs.python.org/library/socket.html>.
>>
> Shutdown implies closing the listening socket, doesn't it?

No (perhaps it should, but that is another issue). There is a
documentation bug; BaseServer.shutdown is documented as "Tells the
serve_forever() loop to stop and waits until it does." [1]
The docstring is much more explicit: """Stops the serve_forever loop.
Blocks until the loop has finished. This must be called while
serve_forever() is running in another thread, or it will deadlock."""

So, if you have a single-threaded server, *don't* use shutdown(). And, to
orderly close the listening socket, use server_close() instead. Your code
would become:

    from SocketServer import TCPServer, BaseRequestHandler

server = TCPServer(('localhost',1234), BaseRequestHandler)
try:
       server.serve_forever()
except KeyboardInterrupt:
       print "^C detected"
       pass
finally:
       print "server_close()"
       server.server_close()
print "bye"

(I've opened http://bugs.python.org/issue6031 )

[1]
http://docs.python.org/dev/library/socketserver.html?highlight=baseserver#SocketServer.BaseServer.shutdown

-- 
Gabriel Genellina



From sam at tregar.com  Fri May 15 21:17:43 2009
From: sam at tregar.com (Sam Tregar)
Date: Fri, 15 May 2009 21:17:43 -0400
Subject: Difference between list() and [] with dictionaries
Message-ID: <fe3354e50905151817ie4df792hebec03ae42eca25c@mail.gmail.com>

Hello all.  Can anyone explain why this creates a list containing a
dictionary:

  [{'a': 'b', 'foo': 'bar'}]

But this creates a list of keys of the dictionary:

  list({ "a": "b", "foo": "bar" })

I expected them to be equivalent but clearly they're not!  I'm using Python
2.6.1 if that helps.

-sam
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From gagsl-py2 at yahoo.com.ar  Fri May 15 21:25:45 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 15 May 2009 22:25:45 -0300
Subject: Tkinter Window On Top
References: <d5ce72b6-f1f7-42fb-b80e-9f65a6a3a39a@18g2000prx.googlegroups.com>
Message-ID: <op.utz0w7ptx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 16:39:41 -0300, Trevor <trevor.lango at gmail.com>  
escribi?:

> Can a Tkinter application create a COM object and keep its own window
> on top of it?
>
> excel = win32com.client.Dispatch('Excel.Application')
>
> I would like the user to be able to see and interact with the Excel
> application but keep the Tkinter application on top.

I don't know how to do that directly with tk, but I'd use the SetWindowPos  
function: http://msdn.microsoft.com/en-us/library/ms632673(VS.85).aspx
The tricky part is to get the right hwnd, this seems to work:

>>> root = Tkinter.Tk()
>>> hwnd = int(root.wm_frame(),0)
>>> win32gui.SetWindowPos(hwnd,
...   win32con.HWND_TOPMOST,
...   0,0,0,0,
...   win32con.SWP_NOMOVE | win32con.SWP_NOSIZE)

-- 
Gabriel Genellina



From nagle at animats.com  Fri May 15 21:28:20 2009
From: nagle at animats.com (John Nagle)
Date: Fri, 15 May 2009 18:28:20 -0700
Subject: Annoying feedparser issues
Message-ID: <4a0e0daf$0$1645$742ec2ed@news.sonic.net>

     This really isn't the fault of the "feedparser" module, but it's
worth mentioning.

     I have an application which needs to read each new item from a feed
as it shows up, as efficiently as possible, because it's monitoring multiple
feeds.  I want exactly one copy of each item as it comes in.

     In theory, this is easy.  Each time the feed is polled, pass in the
timestamp and ID from the previous poll, and if nothing has changed,
a 304 status should come back.

     Results are spotty.  It mostly works for Reuters.  It doesn't work
for Twitter at all; Twitter updates the timestamp even when nothing changes.
So items are routinely re-read.  (That has to be costing Twitter a huge
amount of bandwidth from useless polls.)

     Some sites have changing feed etags because they're using multiple
servers and a load balancer. These can be recognized because the same
etags will show up again after a change.

     Items can supposedly be unduplicated by using the "etag" value.
This almost works, but it's tricker than one might think.  On some feeds,
an item might go away, yet come back in a later feed.  This happens with
news feeds from major news sources, because they have priorities that
don't show up in RSS.  High priority stories might push a low priority story
off the feed, but it may come back later.  Also, every night at 00:00, some
feeds like Reuters re-number everything.  The only thing that works reliably
is comparing the story text.

					John Nagle


From gagsl-py2 at yahoo.com.ar  Fri May 15 21:30:01 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 15 May 2009 22:30:01 -0300
Subject: using urlretrive/urlopen
References: <f46c52560905150803i15ad7968m5fc13738906f8e7d@mail.gmail.com>
Message-ID: <op.utz04beqx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 12:03:09 -0300, Rustom Mody <rustompmody at gmail.com>  
escribi?:

> I am trying to talk to a server that runs on localhost
> The server runs on http://localhost:7000/ and that opens alright in? a
> web browser.
>
> However if I use urlopen or urlretrieve what I get is this 'file' --
> obviously not the one that the browser gets:
>
> <html><body bgcolor="#ffffff">
> Query 'http://localhost:7000/' not implemented
> </body></html>
> Any tips/clues?

Please post the code you're using to access the server.
Do you have any proxy set up?

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May 15 21:38:47 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 15 May 2009 22:38:47 -0300
Subject: How do i generate a tuple from a generator ?
References: <e9465b660905151358o1e0d15d3ve8dc447f634f98b@mail.gmail.com>
Message-ID: <op.utz1ixhrx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 17:58:55 -0300, eye zak <eye.zak.devel at gmail.com>  
escribi?:

> I have a situation where i want a tuple from a generator/sequence
> comprehension.
> I am wondering, is this possible ? or is this just a bad idea all  
> together?
>
> class iterator(object):
>     __slots__ = ('__iters',)
>
>     def __init__(self,*args):
>         assert len(args) != 0
>         self.__iters = tuple( __builtins__.iter(arg) for arg in args )
>
>     def __iter__(self,*args):
>         return self
>
>     def next(self):
>         return [ i.next() for i in self.__iters ]    # HERE I WANT A  
> TUPLE

That is exactly what itertools.izip does

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May 15 22:17:15 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 15 May 2009 23:17:15 -0300
Subject: Difference between list() and [] with dictionaries
References: <fe3354e50905151817ie4df792hebec03ae42eca25c@mail.gmail.com>
Message-ID: <op.utz3a1e3x6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 22:17:43 -0300, Sam Tregar <sam at tregar.com> escribi?:

> Hello all.  Can anyone explain why this creates a list containing a
> dictionary:
>
>   [{'a': 'b', 'foo': 'bar'}]
>
> But this creates a list of keys of the dictionary:
>
>   list({ "a": "b", "foo": "bar" })
>
> I expected them to be equivalent but clearly they're not!  I'm using  
> Python
> 2.6.1 if that helps.

First, a list display [...] and the list constructor list(...) aren't  
quite the same: [1,2,3] is ok; list(1,2,3) is an error. So clearly they  
are not equivalent and you'll have to tune up your expectations :)

list() can take a *single* argument only, a list display [a, b, c] can  
have many comma-separated expressions. So the only possible confusion is  
between list(<x>) and [<x>] where <x> stands for a single expression.

In list(<x>), <x> must be iterable, and means (more or less):

result = []
for item in <x>:
   result.append(item)
return result

In words, list(<x>) iterates over its argument, collecting each item  
yielded into the returned list.

For example, a dictionary is iterable, yielding its keys;  
list(some_dictionary) behaves like you describe in your example. Another  
one: list("abc") returns ['a', 'b', 'c'] because a string is iterable too,  
yielding each of its characters. list(3) is an error because its argument  
must be iterable; list([3]) works, but it's a silly way of simply writting  
[3].

On the other hand, a list display like [...] just collects the expressions  
inside the brackets into a list. No iteration is involved: [<x>] builds a  
list containing a single element, and it doesn't matter whether <x> is  
iterable or not: whatever it is, it becomes the first and only element in  
the returned list.

There is another way of building a list, a "list comprehension". The  
syntax uses brackets too, but explicitely involves an iteration with the  
"for" keyword:
[x for x in range(10) if x%3!=0] yields [1, 2, 4, 5, 7, 8]

-- 
Gabriel Genellina



From mvilas at gmail.com  Fri May 15 22:23:25 2009
From: mvilas at gmail.com (Mario Alejandro Vilas Jerez)
Date: Fri, 15 May 2009 23:23:25 -0300
Subject: WinAppDbg module v1.1 is out!
Message-ID: <3fbf862f0905151923n1278b658p7b2397cfeb3bb197@mail.gmail.com>

What is WinAppDbg?
==================

The WinAppDbg python module allows developers to quickly code
instrumentation
scripts in Python under a Windows environment.

It uses ctypes to wrap many Win32 API calls related to debugging, and
provides
an object-oriented abstraction layer to manipulate threads, libraries and
processes, attach your script as a debugger, trace execution, hook API
calls,
handle events in your debugee and set breakpoints of different kinds (code,
hardware and memory). Additionally it has no native code at all, making it
easier to maintain or modify than other debuggers on Windows.

The intended audience are QA engineers and software security auditors
wishing to
test / fuzz Windows applications with quickly coded Python scripts. Several
ready to use utilities are shipped and can be used for this purposes.

Current features also include disassembling x86 native code (using the open
source diStorm project, see http://ragestorm.net/distorm/), debugging
multiple
processes simultaneously and produce a detailed log of application crashes,
useful for fuzzing and automated testing.


Where can I find WinAppDbg?
===========================

The WinAppDbg project is currently hosted at Sourceforge, and can be found
at:

    http://winappdbg.sourceforge.net/

It's also hosted at the Python Package Index (PyPi):

    http://pypi.python.org/pypi/winappdbg/1.1
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From gagsl-py2 at yahoo.com.ar  Fri May 15 22:38:58 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 15 May 2009 23:38:58 -0300
Subject: Case insensitive version of string.Template?
References: <1242401709.20313.1315649183@webmail.messagingengine.com>
Message-ID: <op.utz4a8lwx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 12:35:09 -0300, <python at bdurham.com> escribi?:

> Using Python 2.6 or higher: Is there a way to configure
> string.Template() to ignore the case of matched identifiers?
> In other words, given the following Template string and
> dictionary where all keys are lowercase, is there a way to have
> my identifiers expanded based on their lowercase values?
> import string
> values = dict( name='John Doe', phone='999-555-1212' )
> output = string.Template( 'My name is $NAME and my phone is
> $Phone.' ).safe_substitute( values )

If you can guarantee the identifiers are all lowercase inside the  
dictionary:

class lowercase_dict(dict):
     def __getitem__(self, name):
         return dict.__getitem__(self, name.lower())

import string
values = lowercase_dict( name='John Doe', phone='999-555-1212' )
output = string.Template( 'My name is $NAME and my phone is $Phone.'  
).safe_substitute( values )

py> output
'My name is John Doe and my phone is 999-555-1212.'

If you cannot guarantee that, subclass string.Template:

class lowercase_template(string.Template):
   def safe_substitute(self, mapping=None, **kws):
     if mapping is None:
       mapping = {}
     m = lowercase_dict((k.lower(),v) for k,v in mapping.items())
     m.update(lowercase_dict((k.lower(),v) for k,v in kws.items()))
     return string.Template.safe_substitute(self, m)

-- 
Gabriel Genellina



From nad at acm.org  Fri May 15 22:46:12 2009
From: nad at acm.org (Ned Deily)
Date: Fri, 15 May 2009 19:46:12 -0700
Subject: Difference between list() and [] with dictionaries
References: <fe3354e50905151817ie4df792hebec03ae42eca25c@mail.gmail.com>
Message-ID: <nad-796A27.19461215052009@news.gmane.org>

In article 
<fe3354e50905151817ie4df792hebec03ae42eca25c at mail.gmail.com>,
 Sam Tregar <sam at tregar.com> wrote:
> Can anyone explain why this creates a list containing a
> dictionary:
>   [{'a': 'b', 'foo': 'bar'}] 
> But this creates a list of keys of the dictionary:
>   list({ "a": "b", "foo": "bar" })

The first example is a list, expressed as a list display literal, 
containing one object: a dictionary, expressed as a dictionary display 
literal.

<http://docs.python.org/reference/expressions.html#atoms>

The second example is a call to the built-in function "list", which 
takes a single iterable as an argument and returns "a list whose items 
are the same and in the same order as iterable?s items".  In this case, 
that single argument is a dictionary.  In an iteration context, the 
iterator obtained for a dictionary iterates over the dictionary's keys.  
The second example is essentially shorthand for:

    list({ "a": "b", "foo": "bar" }.iterkeys())

<http://docs.python.org/library/functions.html#list>
<http://docs.python.org/library/stdtypes.html#mapping-types-dict>

-- 
 Ned Deily,
 nad at acm.org



From gagsl-py2 at yahoo.com.ar  Fri May 15 23:02:28 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 16 May 2009 00:02:28 -0300
Subject: Appending traceback from exception in child thread
References: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>
Message-ID: <op.utz5eethx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 15:09:45 -0300, Edd <edd at nunswithguns.net> escribi?:

> As the comment on the last line indicates, looking at the .value() of
> a Future may give the return value of the associated task, or it may
> also propagate an exception that was raised in a child thread.
>
> Inside the implementation I store caught exceptions with code that
> looks something like:
>
>     try:
>         self.return_value = self.task()
>     except:
>         self.exception = sys.exc_info()[1]
>
> The problem I have is that when an exception is propagated in to the
> parent thread by re-raising it, the part of the traceback from the
> child thread is lost. So if the program dies due to such an exception,
> I can't see what caused it by examining the printed traceback.
>
> To solve this problem, I could of course grab the traceback in the
> child thread and create some kind of custom exception that stashes the
> trace inside. This could then be caught on the fringes of my code in
> order to combine the tracebacks of parent and child together before
> printing it. But I was wondering if there might be a nicer way that
> keeps the original exception object. Perhaps something akin to gluing
> the tracebacks together at the point where the exception is re-raised?

You could use the 3-argument form of the raise statement:
http://docs.python.org/reference/simple_stmts.html#the-raise-statement

There is a problem: remember that the traceback object keeps a reference  
to all previous frames -- that means, all local variables along the whole  
stack of called functions are kept alive until you delete the traceback  
object. And depending on your application, that might involve thousand of  
objects "artificially" alive for an undeterminate period of time...

It it's just for logging/debugging and you don't require access to the  
"live" objects, using a custom attribute in the exception object to store  
a list of strings (like the one traceback.extract_tb builds) may be a  
better idea.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May 15 23:11:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 16 May 2009 00:11:21 -0300
Subject: ConfigParser examples?
References: <gukn24$a47$1@ger.gmane.org>
Message-ID: <op.utz5s70zx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 15 May 2009 18:32:57 -0300, Esmail <ebonak at hotmail.com> escribi?:

> Can anyone point to on the web, or possibly share a simple example
> of the use of the ConfigParser module?

The (excellent!) article series by Doug Hellmann, "Python Module of the  
Week", covers ConfigParser (and almost the whole standard library by now).

http://www.doughellmann.com/PyMOTW

-- 
Gabriel Genellina



From greg at cosc.canterbury.ac.nz  Fri May 15 23:15:48 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Sat, 16 May 2009 15:15:48 +1200
Subject: python copy method alters type
In-Reply-To: <mailman.137.1242306343.8015.python-list@python.org>
References: <mailman.137.1242306343.8015.python-list@python.org>
Message-ID: <776pcgF1eefhuU1@mid.individual.net>

Zhenhai Zhang wrote:

> a: ['a', 1, 3, 4]
> c: ['c' '2' '3' '4']

The lack of commas here suggests that c is actually
a numpy array rather than a list.

Did you import copy from Numeric or numpy, by any
chance?

The following experiment reproduces your result:

 >>> import numpy
 >>> a = ['a', 1, 2, 3]
 >>> c = numpy.copy(a)
 >>> print c
['a' '1' '2' '3']

What's happening here is that numpy.copy is using
the type of the first element to decide the type
of the whole array, and then converting the rest
of the elements to that type.

If you want the standard Python copying behaviour,
use copy.copy instead (or use a[:], which might
be slightly more efficient).

-- 
Greg


From tomf.sessile at gmail.com  Sat May 16 00:18:43 2009
From: tomf.sessile at gmail.com (TomF)
Date: Fri, 15 May 2009 21:18:43 -0700
Subject: Python system with exemplary organization/coding style
References: <2009051416013116807-tomfsessile@gmailcom>
	<fe6abf21-c0ed-426f-b837-0149f4f86858@e20g2000vbc.googlegroups.com>
Message-ID: <2009051521184316807-tomfsessile@gmailcom>

On 2009-05-14 16:18:07 -0700, CTO <debatem1 at gmail.com> said:

> On May 14, 7:01?pm, TomF <tomf.sess... at gmail.com> wrote:
>> I'm looking for a medium-sized Python system with very good coding
>> style and good code organization, so I can learn from it. ?I'm reading
>> various books on Python with advice on such things but I'd prefer to
>> see a real system.
>> 
>> By medium-sized I mean 5-20 classes, 5-20 files, etc; a code base that
>> has some complexity but isn't overwhelming.
>> 
>> Thanks,
>> -Tom
> 
> I'd recommend screenlets. Good documentation and pretty good style,
> and
> they have some external dependencies so you can see how that operates,
> and of course you can see what your code is and isn't doing pretty
> quickly.
> 
> <URL: http://www.screenlets.org>

Thanks, this does look pretty good.  Too bad it's grapics oriented, but 
I suppose I can filter out the graphics dependencies.

-Tom





From descentspb at gmail.com  Sat May 16 02:40:26 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sat, 16 May 2009 10:40:26 +0400
Subject: KeyboardInterrupt catch does not shut down the socketserver
In-Reply-To: <op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>
References: <mailman.183.1242371089.8015.python-list@python.org>	<guj8dv$5sl$2@lust.ihug.co.nz>	<mailman.185.1242375959.8015.python-list@python.org>	<gujl41$d0r$2@lust.ihug.co.nz>
	<4A0D5A35.3010008@gmail.com>
	<op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4A0E5FDA.4070008@gmail.com>

Gabriel Genellina wrote:
> En Fri, 15 May 2009 09:04:05 -0300, Igor Katson escribi?:
>> Lawrence D'Oliveiro wrote:
>>> In message <mailman.185.1242375959.8015.python-list at python.org>, 
>>> Igor Katson wrote:
>>>> Lawrence D'Oliveiro wrote:
>>>>> In message <mailman.183.1242371089.8015.python-list at python.org>, 
>>>>> Igor Katson wrote:
>>>>>
>>>>>> I have problems in getting a SocketServer to shutdown.
>>>>>>
>>>>> Do you want to do a shutdown or a close?
>>>>>
>>>> I want the server close the socket ...
>>>>
>>>
>>> You want to do a close, do a close, not a shutdown 
>>> <http://docs.python.org/library/socket.html>.
>>>
>> Shutdown implies closing the listening socket, doesn't it?
>
> No (perhaps it should, but that is another issue). There is a
> documentation bug; BaseServer.shutdown is documented as "Tells the
> serve_forever() loop to stop and waits until it does." [1]
> The docstring is much more explicit: """Stops the serve_forever loop.
> Blocks until the loop has finished. This must be called while
> serve_forever() is running in another thread, or it will deadlock."""
>
> So, if you have a single-threaded server, *don't* use shutdown(). And, to
> orderly close the listening socket, use server_close() instead. Your code
> would become:
>
>    from SocketServer import TCPServer, BaseRequestHandler
>
> server = TCPServer(('localhost',1234), BaseRequestHandler)
> try:
>       server.serve_forever()
> except KeyboardInterrupt:
>       print "^C detected"
>       pass
> finally:
>       print "server_close()"
>       server.server_close()
> print "bye"
>
> (I've opened http://bugs.python.org/issue6031 )
>
> [1]
> http://docs.python.org/dev/library/socketserver.html?highlight=baseserver#SocketServer.BaseServer.shutdown 
>
>
Thanks, Gabriel, that's exactly what I was waiting for.


From descentspb at gmail.com  Sat May 16 03:04:03 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sat, 16 May 2009 11:04:03 +0400
Subject: KeyboardInterrupt catch does not shut down the socketserver
In-Reply-To: <op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>
References: <mailman.183.1242371089.8015.python-list@python.org>	<guj8dv$5sl$2@lust.ihug.co.nz>	<mailman.185.1242375959.8015.python-list@python.org>	<gujl41$d0r$2@lust.ihug.co.nz>
	<4A0D5A35.3010008@gmail.com>
	<op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4A0E6563.2070400@gmail.com>

Gabriel Genellina wrote:
> En Fri, 15 May 2009 09:04:05 -0300, Igor Katson escribi?:
>> Lawrence D'Oliveiro wrote:
>>> In message <mailman.185.1242375959.8015.python-list at python.org>, 
>>> Igor Katson wrote:
>>>> Lawrence D'Oliveiro wrote:
>>>>> In message <mailman.183.1242371089.8015.python-list at python.org>, 
>>>>> Igor Katson wrote:
>>>>>
>>>>>> I have problems in getting a SocketServer to shutdown.
>>>>>>
>>>>> Do you want to do a shutdown or a close?
>>>>>
>>>> I want the server close the socket ...
>>>>
>>>
>>> You want to do a close, do a close, not a shutdown 
>>> <http://docs.python.org/library/socket.html>.
>>>
>> Shutdown implies closing the listening socket, doesn't it?
>
> No (perhaps it should, but that is another issue). There is a
> documentation bug; BaseServer.shutdown is documented as "Tells the
> serve_forever() loop to stop and waits until it does." [1]
> The docstring is much more explicit: """Stops the serve_forever loop.
> Blocks until the loop has finished. This must be called while
> serve_forever() is running in another thread, or it will deadlock."""
>
> So, if you have a single-threaded server, *don't* use shutdown(). And, to
> orderly close the listening socket, use server_close() instead. Your code
> would become:
>
>    from SocketServer import TCPServer, BaseRequestHandler
>
> server = TCPServer(('localhost',1234), BaseRequestHandler)
> try:
>       server.serve_forever()
> except KeyboardInterrupt:
>       print "^C detected"
>       pass
> finally:
>       print "server_close()"
>       server.server_close()
> print "bye"
>
> (I've opened http://bugs.python.org/issue6031 )
>
> [1]
> http://docs.python.org/dev/library/socketserver.html?highlight=baseserver#SocketServer.BaseServer.shutdown 
>
>
Hmm. Gabriel, could you please show the same for the threaded version? 
This one deadlocks:

from SocketServer import TCPServer, BaseRequestHandler
from threading import Thread

server = TCPServer(('localhost',1234), BaseRequestHandler)
try:
    run_thread = Thread(target=server.serve_forever)
    run_thread.start()
    run_thread.join()
except KeyboardInterrupt:
    print "^C detected"
    pass
finally:
    print "server_shutdown()"
    kill_thread = Thread(target=server.shutdown)
    kill_thread.start()
print "bye"


From deets at nospam.web.de  Sat May 16 03:45:57 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 16 May 2009 09:45:57 +0200
Subject: Appending traceback from exception in child thread
In-Reply-To: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>
References: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>
Message-ID: <77799nF1fk3ihU1@mid.uni-berlin.de>

Edd schrieb:
> Hi folks,
> 
> I have a some threadpool code that works like this :
> 
>     tp = ThreadPool(number_of_threads)
>     futures = [tp.future(t) for t in tasks] # each task is callable
>     for f in futures:
>         print f.value() # <-- may propagate an exception
> 
> The idea being that a Future object represents a value that may or may
> not have been computed yet and the .value() method will block until
> that value is ready.
> 
> As the comment on the last line indicates, looking at the .value() of
> a Future may give the return value of the associated task, or it may
> also propagate an exception that was raised in a child thread.
> 
> Inside the implementation I store caught exceptions with code that
> looks something like:
> 
>     try:
>         self.return_value = self.task()
>     except:
>         self.exception = sys.exc_info()[1]
> 
> The problem I have is that when an exception is propagated in to the
> parent thread by re-raising it, the part of the traceback from the
> child thread is lost. So if the program dies due to such an exception,
> I can't see what caused it by examining the printed traceback.
> 
> To solve this problem, I could of course grab the traceback in the
> child thread and create some kind of custom exception that stashes the
> trace inside. This could then be caught on the fringes of my code in
> order to combine the tracebacks of parent and child together before
> printing it. But I was wondering if there might be a nicer way that
> keeps the original exception object. Perhaps something akin to gluing
> the tracebacks together at the point where the exception is re-raised?

If you are only interested in the original traceback, you can get that 
with the traceback.format function.

Then you don't need to re-raise it in the main-thread, or if so, use the 
formatted stacktrace as payload to an exception.

Diez


From edd at nunswithguns.net  Sat May 16 05:43:25 2009
From: edd at nunswithguns.net (Edd)
Date: Sat, 16 May 2009 02:43:25 -0700 (PDT)
Subject: Appending traceback from exception in child thread
References: <6f370739-45c7-463c-9bd5-761f2aee7408@o30g2000vbc.googlegroups.com>
	<mailman.248.1242442958.8015.python-list@python.org>
Message-ID: <bedd338c-20ea-43e9-9e67-a939dabbfafc@s21g2000vbb.googlegroups.com>

On May 16, 4:02?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:

> You could use the 3-argument form of the raise statement:http://docs.python.org/reference/simple_stmts.html#the-raise-statement

Ah! When did that get there? :)

> There is a problem: remember that the traceback object keeps a reference ?
> to all previous frames -- that means, all local variables along the whole ?
> stack of called functions are kept alive until you delete the traceback ?
> object. And depending on your application, that might involve thousand of ?
> objects "artificially" alive for an undeterminate period of time...

Yes, that may be problematic, I'll have to experiment.

Thanks to everyone's help here, I have plenty of alternatives if it
turns out to be problematic. Your comments are all greatly appreciated
-- thanks!

Kind regards,

Edd


From nick at craig-wood.com  Sat May 16 06:30:01 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sat, 16 May 2009 05:30:01 -0500
Subject: Need advice on distributing small module
References: <guhuqf$h3u$1@reader1.panix.com>
Message-ID: <slrnh0t31o.70l.nick@irishsea.home.craig-wood.com>

kj <socyl at 987jk.com.invalid> wrote:
>  The module has only one non-standard dependency, described by the
>  following code:
> 
>  if sys.version_info[:2] >= (2, 6):
>      import json
>  else:
>      import simplejson as json

I think

try:
    import json
except ImportError:
    import simplejson as json

Is more pythonic...  You aren't relying on what came with particular
python versions which may not be true in jython/ironpython/etc.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From arnodel at googlemail.com  Sat May 16 06:48:52 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 16 May 2009 11:48:52 +0100
Subject: How to get Exif data from a jpeg file
Message-ID: <m263g1pbl7.fsf@googlemail.com>

Hi all,

I need to get the creation date from a jpeg file in Python.  Googling
brought up a several references to apparently defunct modules.  The best
way I have been able to find so far is something like this:

from PIL import Image
img = Image.open('img.jpg')
exif_data = img._getexif()
creation_date = exif_data[36867]

Where 36867 is the exif tag for the creation date data (which I found by
ooking at PIL.ExifTags.TAGS).  But this doesn't even seem to be
documented in the PIL docs.  Is there a more natural way to do this?

Thanks.

-- 
Arnaud


From polygox at googlemail.com  Sat May 16 07:01:59 2009
From: polygox at googlemail.com (Adrian Genaid)
Date: Sat, 16 May 2009 13:01:59 +0200
Subject: using Winpdb in an embedded python interpreter
Message-ID: <20090516130159.3e3661ae@ira.uka.de>

Hi there, 

I have a problem using Winpdb in Pythonscripts running in a program
which uses an embedded Python interpreter. After linking all needed
modules statically to python, "import rpdb2" can be done and leads to
no error.
But on using the next line "rpdb2.start_embedded_debugger('password')".
an error occurs:

Exception in thread ioserver:
Traceback (most recent call last):
  File "C:\Program Files\Python30\lib\threading.py", line 507, in
_bootstrap_inn er
    self.run()
  File "S:\dev\adge\build\r3804\Debug_Win32\py\rpdb2.py", line 4570, in
run threading.Thread.run(self)
  File "C:\Program Files\Python30\lib\threading.py", line 462, in run
    self._target(*self._args, **self._kwargs)
  File "S:\dev\adge\build\r3804\Debug_Win32\py\rpdb2.py", line 9639, in
run (self.m_port, self.m_server) = self.__StartXMLRPCServer()
  File "S:\dev\adge\build\r3804\Debug_Win32\py\rpdb2.py", line 9730, in
__StartX MLRPCServer
    server = CXMLRPCServer((host, port), logRequests = 0)
  File "C:\Program Files\Python30\lib\xmlrpc\server.py", line 530, in
__init__ socketserver.TCPServer.__init__(self, addr, requestHandler,
bind_and_activat e)
  File "C:\Program Files\Python30\lib\socketserver.py", line 400, in
__init__ self.server_bind()
  File "C:\Program Files\Python30\lib\socketserver.py", line 411, in
server_bind

    self.socket.bind(self.server_address)
LookupError: unknown encoding: idna

Does someone have an idea why this error occurs?

Funny thing is that module "socketserver" is taken from "C:\Program
Files\Python30\lib\xmlrpc\server.py", although the module search path
does not contain "C:\Program Files\Python30\lib". Maybe this has
something to do with the problem...

Thanks,
Adrian


From phillip.oldham at gmail.com  Sat May 16 08:39:34 2009
From: phillip.oldham at gmail.com (Phillip B Oldham)
Date: Sat, 16 May 2009 05:39:34 -0700 (PDT)
Subject: Options for creating a statistics screen on a Mac with Python?
Message-ID: <64062d1f-b500-4ba2-9365-6f169bae82af@q2g2000vbr.googlegroups.com>

I've come into possession of a mac mini and a large LCD tv at the
office. I'd like to set it up in the corner to pull statistics from
our various servers (load, uptimes, etc) and display them in a
graphical format, full-screen, with a reasonable refresh rate (say
every 30 seconds). There will be quite a few statistics, and we'll be
adding new servers over time, and since there won't be the option to
scroll a full-screen web-page won't work.

What then would be my options to create a full-screen display of
statistics, and an attractive graphical way, using Python on OS X?


From gert.cuykens at gmail.com  Sat May 16 08:56:59 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 16 May 2009 05:56:59 -0700 (PDT)
Subject: open(os.path.join(os.path.dirname(__file__), '../www/bin/picture.png'),
	'rb')
Message-ID: <bd33f4d1-7dc4-4b56-b9cd-72f7f67492c5@f16g2000vbf.googlegroups.com>

open(os.path.join(os.path.dirname(__file__),'../www/bin/picture.png'),
'rb')
how do you do this on windows (py3) so it still works on linux ?


From deets at nospam.web.de  Sat May 16 09:15:58 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 16 May 2009 15:15:58 +0200
Subject: Options for creating a statistics screen on a Mac with Python?
In-Reply-To: <64062d1f-b500-4ba2-9365-6f169bae82af@q2g2000vbr.googlegroups.com>
References: <64062d1f-b500-4ba2-9365-6f169bae82af@q2g2000vbr.googlegroups.com>
Message-ID: <777skeF1g4b5gU1@mid.uni-berlin.de>

Phillip B Oldham schrieb:
> I've come into possession of a mac mini and a large LCD tv at the
> office. I'd like to set it up in the corner to pull statistics from
> our various servers (load, uptimes, etc) and display them in a
> graphical format, full-screen, with a reasonable refresh rate (say
> every 30 seconds). There will be quite a few statistics, and we'll be
> adding new servers over time, and since there won't be the option to
> scroll a full-screen web-page won't work.
> 
> What then would be my options to create a full-screen display of
> statistics, and an attractive graphical way, using Python on OS X?

matplotlib should serve you well. Or you use some web-based solution 
with a javascript-based chart library. This might be even a bit easier.


Diez


From deets at nospam.web.de  Sat May 16 09:16:42 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 16 May 2009 15:16:42 +0200
Subject: open(os.path.join(os.path.dirname(__file__),
	'../www/bin/picture.png'), 'rb')
In-Reply-To: <bd33f4d1-7dc4-4b56-b9cd-72f7f67492c5@f16g2000vbf.googlegroups.com>
References: <bd33f4d1-7dc4-4b56-b9cd-72f7f67492c5@f16g2000vbf.googlegroups.com>
Message-ID: <777slqF1g4b5gU2@mid.uni-berlin.de>

gert schrieb:
> open(os.path.join(os.path.dirname(__file__),'../www/bin/picture.png'),
> 'rb')
> how do you do this on windows (py3) so it still works on linux ?

os.path.join("..", "www", "bin", "picture.png")

Or use os.sep.

Diez


From s.selvamsiva at gmail.com  Sat May 16 09:18:13 2009
From: s.selvamsiva at gmail.com (S.Selvam)
Date: Sat, 16 May 2009 18:48:13 +0530
Subject: Generic web parser
Message-ID: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>

Hi all,

I have to design web parser which will visit the given list of websites and
need to fetch a particular set of details.
It has to be so generic that even if we add new websites, it must fetch
those details if available anywhere.
So it must be something like a framework.

Though i have done some parsers ,but they will parse for a given format(For.
eg It will get the data from <title> tag).But here each website may have
different format and the information may available within any tags.

I know its a tough task for me,but i feel with python it should be possible.
My request is, if such thing is already available please let me know ,also
your suggestions are welcome.

Note: I planned to use BeautifulSoup for parsing.

-- 
Yours,
S.Selvam
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From google at mrabarnett.plus.com  Sat May 16 09:35:02 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 16 May 2009 14:35:02 +0100
Subject: open(os.path.join(os.path.dirname(__file__),
	'../www/bin/picture.png'), 'rb')
In-Reply-To: <777slqF1g4b5gU2@mid.uni-berlin.de>
References: <bd33f4d1-7dc4-4b56-b9cd-72f7f67492c5@f16g2000vbf.googlegroups.com>
	<777slqF1g4b5gU2@mid.uni-berlin.de>
Message-ID: <4A0EC106.3050609@mrabarnett.plus.com>

Diez B. Roggisch wrote:
> gert schrieb:
>> open(os.path.join(os.path.dirname(__file__),'../www/bin/picture.png'),
>> 'rb')
>> how do you do this on windows (py3) so it still works on linux ?
> 
> os.path.join("..", "www", "bin", "picture.png")
> 
> Or use os.sep.
> 
Windows should understand '/' as well as '\'.


From gert.cuykens at gmail.com  Sat May 16 09:40:02 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 16 May 2009 06:40:02 -0700 (PDT)
Subject: open(os.path.join(os.path.dirname(__file__),
	'../www/bin/picture.png'), 'rb')
References: <bd33f4d1-7dc4-4b56-b9cd-72f7f67492c5@f16g2000vbf.googlegroups.com>
	<777slqF1g4b5gU2@mid.uni-berlin.de>
Message-ID: <5db266a3-c4d6-4567-baba-2aca6f505261@t10g2000vbg.googlegroups.com>

On May 16, 3:16?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> gert schrieb:
>
> > open(os.path.join(os.path.dirname(__file__),'../www/bin/picture.png'),
> > 'rb')
> > how do you do this on windows (py3) so it still works on linux ?
>
> os.path.join("..", "www", "bin", "picture.png")
>
> Or use os.sep.
>
> Diez

IOError: [Errno 2] No such file or directory: 'C:\\Users\\gert\\Desktop
\\koen\\a
ppwsgi/wsgi\\..\\www\\bin\\picture.png'

The os.path.dirname(__file__) is still in posix mode ?



From gert.cuykens at gmail.com  Sat May 16 09:45:32 2009
From: gert.cuykens at gmail.com (gert)
Date: Sat, 16 May 2009 06:45:32 -0700 (PDT)
Subject: open(os.path.join(os.path.dirname(__file__),
	'../www/bin/picture.png'), 'rb')
References: <bd33f4d1-7dc4-4b56-b9cd-72f7f67492c5@f16g2000vbf.googlegroups.com>
	<777slqF1g4b5gU2@mid.uni-berlin.de>
	<5db266a3-c4d6-4567-baba-2aca6f505261@t10g2000vbg.googlegroups.com>
Message-ID: <f9de36bf-0c70-441e-a3f3-72cce2d1f08f@n4g2000vba.googlegroups.com>

On May 16, 3:40?pm, gert <gert.cuyk... at gmail.com> wrote:
> On May 16, 3:16?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> > gert schrieb:
>
> > > open(os.path.join(os.path.dirname(__file__),'../www/bin/picture.png'),
> > > 'rb')
> > > how do you do this on windows (py3) so it still works on linux ?
>
> > os.path.join("..", "www", "bin", "picture.png")
>
> > Or use os.sep.
>
> > Diez
>
> IOError: [Errno 2] No such file or directory: 'C:\\Users\\gert\\Desktop
> \\koen\\a
> ppwsgi/wsgi\\..\\www\\bin\\picture.png'
>
> The os.path.dirname(__file__) is still in posix mode ?

DOH!!! forgot to actually put the file in the directory :)
works both ways never mind the question, thanks.


From sebastianthegreatful at gmail.com  Sat May 16 09:51:31 2009
From: sebastianthegreatful at gmail.com (Seb)
Date: Sat, 16 May 2009 06:51:31 -0700 (PDT)
Subject: xml menu pygtk
Message-ID: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>

I'm trying to construct a menu from an xml file. However my recursive
algorithm isn't doing what I want it too. I've been starring at this
for too long. Any help appreciated :)

I get the following error but the problem is more of a logical nature.
./gnomeAppletMenu.py:40: GtkWarning: gtk_menu_shell_insert: assertion
`GTK_IS_MENU_ITEM (child)' failed
  menu_bar.append(menu)

I'm pretty sure I fuck up around line 27-30

xml file:
http://pastie.org/480045

python code:
http://pastie.org/480042


best regards,
Seb


From google at mrabarnett.plus.com  Sat May 16 10:20:30 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 16 May 2009 15:20:30 +0100
Subject: xml menu pygtk
In-Reply-To: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>
References: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>
Message-ID: <4A0ECBAE.9010000@mrabarnett.plus.com>

Seb wrote:
> I'm trying to construct a menu from an xml file. However my recursive
> algorithm isn't doing what I want it too. I've been starring at this
> for too long. Any help appreciated :)
> 
> I get the following error but the problem is more of a logical nature.
> ./gnomeAppletMenu.py:40: GtkWarning: gtk_menu_shell_insert: assertion
> `GTK_IS_MENU_ITEM (child)' failed
>   menu_bar.append(menu)
> 
> I'm pretty sure I fuck up around line 27-30
> 
> xml file:
> http://pastie.org/480045
> 
> python code:
> http://pastie.org/480042
> 
The traceback suggests to me that you can add only a 'MenuItem' to a
'MenuBar', but create_menu() is returning a 'Menu'.


From sebastianthegreatful at gmail.com  Sat May 16 10:27:11 2009
From: sebastianthegreatful at gmail.com (Seb)
Date: Sat, 16 May 2009 07:27:11 -0700 (PDT)
Subject: xml menu pygtk
References: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>
	<mailman.258.1242483622.8015.python-list@python.org>
Message-ID: <e25acc20-bea6-4461-9f30-b7a51f27ef05@m24g2000vbp.googlegroups.com>

On May 16, 4:20?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Seb wrote:
> > I'm trying to construct a menu from an xml file. However my recursive
> > algorithm isn't doing what I want it too. I've been starring at this
> > for too long. Any help appreciated :)
>
> > I get the following error but the problem is more of a logical nature.
> > ./gnomeAppletMenu.py:40: GtkWarning: gtk_menu_shell_insert: assertion
> > `GTK_IS_MENU_ITEM (child)' failed
> > ? menu_bar.append(menu)
>
> > I'm pretty sure I fuck up around line 27-30
>
> > xml file:
> >http://pastie.org/480045
>
> > python code:
> >http://pastie.org/480042
>
> The traceback suggests to me that you can add only a 'MenuItem' to a
> 'MenuBar', but create_menu() is returning a 'Menu'.

Doesn't a MenuBar consists of Menu's?

best regards,
Seb


From phillip.oldham at gmail.com  Sat May 16 10:54:35 2009
From: phillip.oldham at gmail.com (Phillip B Oldham)
Date: Sat, 16 May 2009 07:54:35 -0700 (PDT)
Subject: Options for creating a statistics screen on a Mac with Python?
References: <64062d1f-b500-4ba2-9365-6f169bae82af@q2g2000vbr.googlegroups.com>
	<777skeF1g4b5gU1@mid.uni-berlin.de>
Message-ID: <88270345-ede7-42b6-af27-b41e79461951@m24g2000vbp.googlegroups.com>

On May 16, 2:15?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> matplotlib should serve you well.

Thanks, I'll check that out.

> Or you use some web-based solution with a javascript-based chart library.

I'd rather stay away from web-based solutions; since this is going to
be running 24/7 and has a fixed a screen size. I'd prefer something
that has few dependencies, if possible hooking into the OS X platform
for graphics.


From google at mrabarnett.plus.com  Sat May 16 11:04:37 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 16 May 2009 16:04:37 +0100
Subject: xml menu pygtk
In-Reply-To: <e25acc20-bea6-4461-9f30-b7a51f27ef05@m24g2000vbp.googlegroups.com>
References: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>	<mailman.258.1242483622.8015.python-list@python.org>
	<e25acc20-bea6-4461-9f30-b7a51f27ef05@m24g2000vbp.googlegroups.com>
Message-ID: <4A0ED605.7030207@mrabarnett.plus.com>

Seb wrote:
> On May 16, 4:20 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>> Seb wrote:
>>> I'm trying to construct a menu from an xml file. However my recursive
>>> algorithm isn't doing what I want it too. I've been starring at this
>>> for too long. Any help appreciated :)
>>> I get the following error but the problem is more of a logical nature.
>>> ./gnomeAppletMenu.py:40: GtkWarning: gtk_menu_shell_insert: assertion
>>> `GTK_IS_MENU_ITEM (child)' failed
>>>   menu_bar.append(menu)
>>> I'm pretty sure I fuck up around line 27-30
>>> xml file:
>>> http://pastie.org/480045
>>> python code:
>>> http://pastie.org/480042
>> The traceback suggests to me that you can add only a 'MenuItem' to a
>> 'MenuBar', but create_menu() is returning a 'Menu'.
> 
> Doesn't a MenuBar consists of Menu's?
> 
I've had a look at some examples on the web and it looks like you need
to:

1. Set the menu on a menu item (the 'set_submenu' method);
2. Append the menu item onto the menu bar.

What you're actually doing is:

1. Setting the menu on a menu item;
2. Appending the menu item onto a menu;
3. Trying to append the menu onto the menu bar.

Result: exception.

HTH


From sebastianthegreatful at gmail.com  Sat May 16 11:15:24 2009
From: sebastianthegreatful at gmail.com (Seb)
Date: Sat, 16 May 2009 08:15:24 -0700 (PDT)
Subject: xml menu pygtk
References: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>
	<mailman.258.1242483622.8015.python-list@python.org>
	<e25acc20-bea6-4461-9f30-b7a51f27ef05@m24g2000vbp.googlegroups.com>
	<mailman.259.1242486269.8015.python-list@python.org>
Message-ID: <56fd84aa-478c-4310-913f-bcfd1905813e@q14g2000vbn.googlegroups.com>

On May 16, 5:04?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Seb wrote:
> > On May 16, 4:20 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> >> Seb wrote:
> >>> I'm trying to construct a menu from an xml file. However my recursive
> >>> algorithm isn't doing what I want it too. I've been starring at this
> >>> for too long. Any help appreciated :)
> >>> I get the following error but the problem is more of a logical nature.
> >>> ./gnomeAppletMenu.py:40: GtkWarning: gtk_menu_shell_insert: assertion
> >>> `GTK_IS_MENU_ITEM (child)' failed
> >>> ? menu_bar.append(menu)
> >>> I'm pretty sure I fuck up around line 27-30
> >>> xml file:
> >>>http://pastie.org/480045
> >>> python code:
> >>>http://pastie.org/480042
> >> The traceback suggests to me that you can add only a 'MenuItem' to a
> >> 'MenuBar', but create_menu() is returning a 'Menu'.
>
> > Doesn't a MenuBar consists of Menu's?
>
> I've had a look at some examples on the web and it looks like you need
> to:
>
> 1. Set the menu on a menu item (the 'set_submenu' method);
> 2. Append the menu item onto the menu bar.
>
> What you're actually doing is:
>
> 1. Setting the menu on a menu item;
> 2. Appending the menu item onto a menu;
> 3. Trying to append the menu onto the menu bar.
>
> Result: exception.
>
> HTH


Ok, now it looks like below. I don't get any errors but the dictionary
entry show up as a toplevel menu... damn!!

def create_menu(node):
	menus = []
	for child in node.childNodes:
		if child.localName == "item":
			menus.append(gtk.MenuItem(child.getAttribute("name")))
		if child.localName == "seperator":
			menus.append(gtk.SeparatorMenuItem())
		if child.localName == "menu": #if child.childNodes:
			menuitem = gtk.MenuItem(child.getAttribute("name"))
			menu = gtk.Menu()
			for mi in create_menu(child):	# for each menuitem
				menu.append(mi)		# append each menuitem to menu
			menuitem.set_submenu(menu)	# set menu as submenu of menuitem
			menus.append(menuitem)
	return menus

def factory(applet, iid):
	doc = minidom.parse("menu.xml")
	rootNode = doc.documentElement

	menu_bar = gtk.MenuBar()
	for cn in rootNode.childNodes:		# for each menu under menus
		for menu in create_menu(cn):	# for each menu in list
			menu_bar.append(menu)	# append each menu

	applet.add(menu_bar)
	applet.show_all()
	return True


From aahz at pythoncraft.com  Sat May 16 11:28:02 2009
From: aahz at pythoncraft.com (Aahz)
Date: 16 May 2009 08:28:02 -0700
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
	<50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com>
	<mailman.216.1242408349.8015.python-list@python.org>
	<180531ca-33aa-47b9-9c69-5b5973f6b6f9@v35g2000pro.googlegroups.com>
Message-ID: <gumm22$itv$1@panix3.panix.com>

In article <180531ca-33aa-47b9-9c69-5b5973f6b6f9 at v35g2000pro.googlegroups.com>,
John Machin  <sjmachin at lexicon.net> wrote:
>
>Neat trick. However, from 2.6.2:
>
>>>> help(sum)
>Help on built-in function sum in module __builtin__:
>
>sum(...)
>    sum(sequence[, start]) -> value
>
>    Returns the sum of a sequence of numbers (NOT strings) plus the
>value
>    of parameter 'start' (which defaults to 0).  When the sequence is
>    empty, returns start.
>
>Since when is a list a number? Perhaps the help needs clarification,
>in line with the docs.

The primary use-case for sum() is numbers, with a special exception to
prohibit using strings.  Only strings are prohibited to allow using sum()
with user-defined classes.  That makes it a little difficult to document
precisely in a summary; unless you can come up with a specific better
wording, the docs will probably stay as-is.  If you do come up with
something better, please file it on bugs.python.org.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From sebastianthegreatful at gmail.com  Sat May 16 11:39:58 2009
From: sebastianthegreatful at gmail.com (Seb)
Date: Sat, 16 May 2009 08:39:58 -0700 (PDT)
Subject: xml menu pygtk
References: <46ac577b-9bdb-4076-96ce-ed127fba7be1@f16g2000vbf.googlegroups.com>
	<mailman.258.1242483622.8015.python-list@python.org>
	<e25acc20-bea6-4461-9f30-b7a51f27ef05@m24g2000vbp.googlegroups.com>
	<mailman.259.1242486269.8015.python-list@python.org>
Message-ID: <c6bd7cd9-e92c-4935-8d90-c401e8d5a1ae@x6g2000vbg.googlegroups.com>

On May 16, 5:04?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Seb wrote:
> > On May 16, 4:20 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> >> Seb wrote:
> >>> I'm trying to construct a menu from an xml file. However my recursive
> >>> algorithm isn't doing what I want it too. I've been starring at this
> >>> for too long. Any help appreciated :)
> >>> I get the following error but the problem is more of a logical nature.
> >>> ./gnomeAppletMenu.py:40: GtkWarning: gtk_menu_shell_insert: assertion
> >>> `GTK_IS_MENU_ITEM (child)' failed
> >>> ? menu_bar.append(menu)
> >>> I'm pretty sure I fuck up around line 27-30
> >>> xml file:
> >>>http://pastie.org/480045
> >>> python code:
> >>>http://pastie.org/480042
> >> The traceback suggests to me that you can add only a 'MenuItem' to a
> >> 'MenuBar', but create_menu() is returning a 'Menu'.
>
> > Doesn't a MenuBar consists of Menu's?
>
> I've had a look at some examples on the web and it looks like you need
> to:
>
> 1. Set the menu on a menu item (the 'set_submenu' method);
> 2. Append the menu item onto the menu bar.
>
> What you're actually doing is:
>
> 1. Setting the menu on a menu item;
> 2. Appending the menu item onto a menu;
> 3. Trying to append the menu onto the menu bar.
>
> Result: exception.
>
> HTH

I managed to get it to work. I thanks a lot for your help.

best regards,
Seb


From rcdailey at gmail.com  Sat May 16 12:33:50 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Sat, 16 May 2009 09:33:50 -0700 (PDT)
Subject: tarfile doesn't work with tgz files?
Message-ID: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>

Hi,

I'm not a big expert on the tarfile component, but I assumed that .tgz
files were short for .tar.gz and the format was the same. When I try
to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
the following error:

  File "C:\Python30\lib\tarfile.py", line 1630, in open
    raise ReadError("file could not be opened successfully")
tarfile.ReadError: file could not be opened successfully

I'm assuming this is because the .tgz format is not what I think it is
and is not supported. How can I extract .tgz files using Python 3.0?
Note that I probably can't depend on third party python modules, since
I have yet to find many that support Python 3.0.

Thanks.


From python at bdurham.com  Sat May 16 12:37:28 2009
From: python at bdurham.com (python at bdurham.com)
Date: Sat, 16 May 2009 12:37:28 -0400
Subject: Case insensitive version of string.Template?
In-Reply-To: <op.utz4a8lwx6zn5v@lepton.softlabbsas.com.ar>
References: <1242401709.20313.1315649183@webmail.messagingengine.com>
	<op.utz4a8lwx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <1242491848.21317.1315782933@webmail.messagingengine.com>

Gabriel,

<snipped>
If you can guarantee the identifiers are all lowercase inside the  
dictionary:

class lowercase_dict(dict):
     def __getitem__(self, name):
         return dict.__getitem__(self, name.lower())

import string
values = lowercase_dict( name='John Doe', phone='999-555-1212' )
output = string.Template( 'My name is $NAME and my phone is $Phone.'  
).safe_substitute( values )
</snipped>

Brilliant!! Using a custom dictionary solves my problem and gives me
some ideas on similar challenges.

Thank you!

Regards,
Malcolm


From kushal.kumaran at gmail.com  Sat May 16 12:46:01 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Sat, 16 May 2009 22:16:01 +0530
Subject: tarfile doesn't work with tgz files?
In-Reply-To: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
Message-ID: <1e364c4e0905160946w100a94dao501bdff24a665d6b@mail.gmail.com>

On Sat, May 16, 2009 at 10:03 PM, Robert Dailey <rcdailey at gmail.com> wrote:
> Hi,
>
> I'm not a big expert on the tarfile component, but I assumed that .tgz
> files were short for .tar.gz and the format was the same. When I try
> to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
> the following error:
>
> ?File "C:\Python30\lib\tarfile.py", line 1630, in open
> ? ?raise ReadError("file could not be opened successfully")
> tarfile.ReadError: file could not be opened successfully
>
> I'm assuming this is because the .tgz format is not what I think it is
> and is not supported. How can I extract .tgz files using Python 3.0?
> Note that I probably can't depend on third party python modules, since
> I have yet to find many that support Python 3.0.
>

Is the file itself correct?  Are you able to extract the files using
any compression program?  Do you have a version of tar installed that
you can try extracting the file with?  If you don't, a Windows version
of tar will be available with cygwin.

-- 
kushal


From rcdailey at gmail.com  Sat May 16 12:47:25 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Sat, 16 May 2009 09:47:25 -0700 (PDT)
Subject: tarfile doesn't work with tgz files?
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
Message-ID: <01171386-1966-45e0-8d92-d7e4ca9862d5@x6g2000vbg.googlegroups.com>

On May 16, 11:33?am, Robert Dailey <rcdai... at gmail.com> wrote:
> Hi,
>
> I'm not a big expert on the tarfile component, but I assumed that .tgz
> files were short for .tar.gz and the format was the same. When I try
> to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
> the following error:
>
> ? File "C:\Python30\lib\tarfile.py", line 1630, in open
> ? ? raise ReadError("file could not be opened successfully")
> tarfile.ReadError: file could not be opened successfully
>
> I'm assuming this is because the .tgz format is not what I think it is
> and is not supported. How can I extract .tgz files using Python 3.0?
> Note that I probably can't depend on third party python modules, since
> I have yet to find many that support Python 3.0.
>
> Thanks.

Correction, it is the following line that breaks:

tarfile.open( file )

When I try to *open* the file it fails, not extract. Sorry for the
mixup.


From gherron at islandtraining.com  Sat May 16 12:49:36 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Sat, 16 May 2009 09:49:36 -0700
Subject: tarfile doesn't work with tgz files?
In-Reply-To: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
Message-ID: <4A0EEEA0.1050107@islandtraining.com>

Robert Dailey wrote:
> Hi,
>
> I'm not a big expert on the tarfile component, but I assumed that .tgz
> files were short for .tar.gz and the format was the same. 

That's correct.

> When I try
> to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
> the following error:
>
>   File "C:\Python30\lib\tarfile.py", line 1630, in open
>     raise ReadError("file could not be opened successfully")
> tarfile.ReadError: file could not be opened successfully
>
> I'm assuming this is because the .tgz format is not what I think it is
> and is not supported.

Not true.  It's supported.
>  How can I extract .tgz files using Python 3.0?
> Note that I probably can't depend on third party python modules, since
> I have yet to find many that support Python 3.0.
>
> Thanks.
>   

It's hard to debug your code when you don't show us your code,  so I 
won't try.

I can however supply a bit of working code:

 >>> import tarfile
 >>> f=tarfile.open('f.tgz')
 >>> f.list()
-rw-r--r-- gherron/gherron        703 2009-03-14 15:59:46 t.py
-rw-r--r-- gherron/gherron        566 2009-05-15 09:13:08 note-bzr-hg
-rw-r--r-- gherron/gherron      11563 2009-04-24 09:33:12 .emacs

So the module correctly reads the tar-gzip file, and finds its contents.

Now, what is it you were trying to do?


Gary Herron





From manu3d at gmail.com  Sat May 16 12:55:39 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Sat, 16 May 2009 09:55:39 -0700 (PDT)
Subject: Swapping superclass from a module
Message-ID: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>

Hi everybody,

let's assume I have a module with loads of classes inheriting from one
class, from the same module, i.e.:

## myFile.py
class SuperClass(object)
class SubClass1(SuperClass)
class SubClass2(SuperClass)
class SubClass3(SuperClass)

In a separate file I also have:

## myOtherFile.py
class NewSuperClass(object)

Now, let's also assume that myFile.py cannot be changed or it's
impractical to do so. Is there a way to replace the SuperClass at
runtime, so that when I instantiate one of the subclasses
NewSuperClass is used instead of the original SuperClass provided by
the first module module?

That was the generic case. Would the solution change much if
NewSuperClass was actually inheriting from SuperClass, effectively
wedging itself between the SuperClass and the SubClasses?

Manu





From rcdailey at gmail.com  Sat May 16 12:55:59 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Sat, 16 May 2009 09:55:59 -0700 (PDT)
Subject: tarfile doesn't work with tgz files?
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
	<mailman.262.1242492583.8015.python-list@python.org>
Message-ID: <4854694f-12a3-48d3-a645-7fc111171574@x6g2000vbg.googlegroups.com>

On May 16, 11:49?am, Gary Herron <gher... at islandtraining.com> wrote:
> Robert Dailey wrote:
> > Hi,
>
> > I'm not a big expert on the tarfile component, but I assumed that .tgz
> > files were short for .tar.gz and the format was the same.
>
> That's correct.
>
> > When I try
> > to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
> > the following error:
>
> > ? File "C:\Python30\lib\tarfile.py", line 1630, in open
> > ? ? raise ReadError("file could not be opened successfully")
> > tarfile.ReadError: file could not be opened successfully
>
> > I'm assuming this is because the .tgz format is not what I think it is
> > and is not supported.
>
> Not true. ?It's supported.
>
> > ?How can I extract .tgz files using Python 3.0?
> > Note that I probably can't depend on third party python modules, since
> > I have yet to find many that support Python 3.0.
>
> > Thanks.
>
> It's hard to debug your code when you don't show us your code, ?so I
> won't try.
>
> I can however supply a bit of working code:
>
> ?>>> import tarfile
> ?>>> f=tarfile.open('f.tgz')
> ?>>> f.list()
> -rw-r--r-- gherron/gherron ? ? ? ?703 2009-03-14 15:59:46 t.py
> -rw-r--r-- gherron/gherron ? ? ? ?566 2009-05-15 09:13:08 note-bzr-hg
> -rw-r--r-- gherron/gherron ? ? ?11563 2009-04-24 09:33:12 .emacs
>
> So the module correctly reads the tar-gzip file, and finds its contents.
>
> Now, what is it you were trying to do?
>
> Gary Herron

I wasn't sure if my code was relevant, since there really isn't much
to show. Here is the convenience function I've created for extracting
the contents of a tar.gz or tgz file on Windows:

def untar( file, dst ):
   print( file )
   print( dst )
   tarball = tarfile.open( file )
   tarball.extractall( dst )
   tarball.close()

The respective results of the 2 print statements above are:

D:\IT\personal\layout-editor\temp\tbb21_20080605oss_src.tgz
D:\IT\personal\layout-editor\temp

And the full output I get:

Traceback (most recent call last):
  File "D:\IT\personal\layout-editor\third_party.py", line 257, in
<module>
    tbb.Process()
  File "D:\IT\personal\layout-editor\third_party.py", line 247, in
Process
    install_operation.Process( self, 'tbb' )
  File "D:\IT\personal\layout-editor\third_party.py", line 160, in
Process
    build_operation.Process( self, name )
  File "D:\IT\personal\layout-editor\third_party.py", line 138, in
Process
    self.Extract()
  File "D:\IT\personal\layout-editor\third_party.py", line 125, in
Extract
    extract( file, self._outdir )
  File "D:\IT\personal\layout-editor\third_party.py", line 43, in
untar
    tarball = tarfile.open( file )
  File "C:\Python30\lib\tarfile.py", line 1630, in open
    raise ReadError("file could not be opened successfully")
tarfile.ReadError: file could not be opened successfully


From rcdailey at gmail.com  Sat May 16 12:56:45 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Sat, 16 May 2009 09:56:45 -0700 (PDT)
Subject: tarfile doesn't work with tgz files?
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
	<mailman.261.1242492394.8015.python-list@python.org>
Message-ID: <21154344-1f98-49a5-9dfa-8d4992c75135@v4g2000vba.googlegroups.com>

On May 16, 11:46?am, Kushal Kumaran <kushal.kuma... at gmail.com> wrote:
> On Sat, May 16, 2009 at 10:03 PM, Robert Dailey <rcdai... at gmail.com> wrote:
> > Hi,
>
> > I'm not a big expert on the tarfile component, but I assumed that .tgz
> > files were short for .tar.gz and the format was the same. When I try
> > to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
> > the following error:
>
> > ?File "C:\Python30\lib\tarfile.py", line 1630, in open
> > ? ?raise ReadError("file could not be opened successfully")
> > tarfile.ReadError: file could not be opened successfully
>
> > I'm assuming this is because the .tgz format is not what I think it is
> > and is not supported. How can I extract .tgz files using Python 3.0?
> > Note that I probably can't depend on third party python modules, since
> > I have yet to find many that support Python 3.0.
>
> Is the file itself correct? ?Are you able to extract the files using
> any compression program? ?Do you have a version of tar installed that
> you can try extracting the file with? ?If you don't, a Windows version
> of tar will be available with cygwin.
>
> --
> kushal

Yes, I can open and extract it using WinRAR


From rcdailey at gmail.com  Sat May 16 13:04:03 2009
From: rcdailey at gmail.com (Robert Dailey)
Date: Sat, 16 May 2009 10:04:03 -0700 (PDT)
Subject: tarfile doesn't work with tgz files?
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
	<mailman.262.1242492583.8015.python-list@python.org>
Message-ID: <30d589fb-9b02-4c84-b56a-d6540bd93aa4@p4g2000vba.googlegroups.com>

On May 16, 11:49?am, Gary Herron <gher... at islandtraining.com> wrote:
> Robert Dailey wrote:
> > Hi,
>
> > I'm not a big expert on the tarfile component, but I assumed that .tgz
> > files were short for .tar.gz and the format was the same.
>
> That's correct.
>
> > When I try
> > to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
> > the following error:
>
> > ? File "C:\Python30\lib\tarfile.py", line 1630, in open
> > ? ? raise ReadError("file could not be opened successfully")
> > tarfile.ReadError: file could not be opened successfully
>
> > I'm assuming this is because the .tgz format is not what I think it is
> > and is not supported.
>
> Not true. ?It's supported.
>
> > ?How can I extract .tgz files using Python 3.0?
> > Note that I probably can't depend on third party python modules, since
> > I have yet to find many that support Python 3.0.
>
> > Thanks.
>
> It's hard to debug your code when you don't show us your code, ?so I
> won't try.
>
> I can however supply a bit of working code:
>
> ?>>> import tarfile
> ?>>> f=tarfile.open('f.tgz')
> ?>>> f.list()
> -rw-r--r-- gherron/gherron ? ? ? ?703 2009-03-14 15:59:46 t.py
> -rw-r--r-- gherron/gherron ? ? ? ?566 2009-05-15 09:13:08 note-bzr-hg
> -rw-r--r-- gherron/gherron ? ? ?11563 2009-04-24 09:33:12 .emacs
>
> So the module correctly reads the tar-gzip file, and finds its contents.
>
> Now, what is it you were trying to do?
>
> Gary Herron

Okay so I managed to figure out the problem.

Initially, I manually downloaded the TGZ above through Chrome and then
opened it in WinRAR and extracted the files. Everything worked fine.

Then, I ran my Python script which uses urlretrieve() to download the
file and then tarfile is used to extract it. However, urlretrieve()
was not downloading the full file because of a bug that was corrupting
my URL.

Sorry for the confusion, and thanks to everyone for the very prompt
help!


From anand.ibmgsi at gmail.com  Sat May 16 13:13:30 2009
From: anand.ibmgsi at gmail.com (anand j)
Date: Sat, 16 May 2009 22:43:30 +0530
Subject: Python code-bloat tool-- warning n00b stuff...
Message-ID: <1a3a139e0905161013p2ff1c024l260ad57433e1be20@mail.gmail.com>

Hi,
    I am looking for a bunch of rules or a tool that takes the code for my
python class and checks the amount of code bloat and points out where i can
improve. I am a n00b to python and built an application linking wordnet and
graph packages. but somehow have this nagging feeling my code is too bloated
with too many functions..... might just be paranoia , but worth an
investigation i guess.....

Sorry if this is a repeat/trivial question, I could not find any
comprehensive links on google or the mailing list archive that is within my
gmail. Currently, trying to download the other archives and index using
whoosh and try searching it.

Thanks

==============================================
Anand J
Center for Behaviour and Cognitive Sciences
University of Allahabad
Allahabad-211002
http://sites.google.com/a/cbcs.ac.in/students/anand
==============================================
The man who is really serious,
with the urge to find out what truth is,
has no style at all. He lives only in what is.
                 ~Bruce Lee
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From ebonak at hotmail.com  Sat May 16 13:23:48 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 16 May 2009 13:23:48 -0400
Subject: ConfigParser examples?
In-Reply-To: <op.utz5s70zx6zn5v@lepton.softlabbsas.com.ar>
References: <gukn24$a47$1@ger.gmane.org>
	<op.utz5s70zx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4A0EF6A4.3040704@hotmail.com>

Hi Gabriel,

Gabriel Genellina wrote:
> 
> The (excellent!) article series by Doug Hellmann, "Python Module of the 
> Week", covers ConfigParser (and almost the whole standard library by now).
> 
> http://www.doughellmann.com/PyMOTW

Thanks for the pointer, I hadn't come across this site before, it
looks like a place with a lot of useful information!

Esmail




From nick at craig-wood.com  Sat May 16 14:30:00 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sat, 16 May 2009 13:30:00 -0500
Subject: Options for creating a statistics screen on a Mac with Python?
References: <64062d1f-b500-4ba2-9365-6f169bae82af@q2g2000vbr.googlegroups.com>
	<777skeF1g4b5gU1@mid.uni-berlin.de>
Message-ID: <slrnh0tvua.gvq.nick@irishsea.home.craig-wood.com>

Diez B. Roggisch <deets at nospam.web.de> wrote:
>  Phillip B Oldham schrieb:
> > I've come into possession of a mac mini and a large LCD tv at the
> > office. I'd like to set it up in the corner to pull statistics from
> > our various servers (load, uptimes, etc) and display them in a
> > graphical format, full-screen, with a reasonable refresh rate (say
> > every 30 seconds). There will be quite a few statistics, and we'll be
> > adding new servers over time, and since there won't be the option to
> > scroll a full-screen web-page won't work.
> > 
> > What then would be my options to create a full-screen display of
> > statistics, and an attractive graphical way, using Python on OS X?
> 
>  matplotlib should serve you well. Or you use some web-based solution 
>  with a javascript-based chart library. This might be even a bit
>  easier.

I'd use pygame for a really clean full screen display.

Probably a bit more work, but you'll get something really cool at the
end of it!

here is how to use matplotlib on a pygame surface

  http://www.pygame.org/wiki/MatplotlibPygame

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From draeath.spamtrap at gmail.com  Sat May 16 14:33:04 2009
From: draeath.spamtrap at gmail.com (draeath)
Date: Sat, 16 May 2009 13:33:04 -0500
Subject: tarfile doesn't work with tgz files?
References: <b4286d9f-c186-4a86-987f-458bc96e9763@s31g2000vbp.googlegroups.com>
	<mailman.262.1242492583.8015.python-list@python.org>
	<30d589fb-9b02-4c84-b56a-d6540bd93aa4@p4g2000vba.googlegroups.com>
Message-ID: <bfmdncMY-4V9m5LXnZ2dnUVZ_uGdnZ2d@giganews.com>

On 2009-05-16, Robert Dailey <rcdailey at gmail.com> wrote:
> On May 16, 11:49?am, Gary Herron <gher... at islandtraining.com> wrote:
>> Robert Dailey wrote:
>> > Hi,
>>
>> > I'm not a big expert on the tarfile component, but I assumed that .tgz
>> > files were short for .tar.gz and the format was the same.
>>
>> That's correct.
>>
>> > When I try
>> > to extract a .tgz file using tarfile in Python 3.0 on Windows, I get
>> > the following error:
>>
>> > ? File "C:\Python30\lib\tarfile.py", line 1630, in open
>> > ? ? raise ReadError("file could not be opened successfully")
>> > tarfile.ReadError: file could not be opened successfully
>>
>> > I'm assuming this is because the .tgz format is not what I think it is
>> > and is not supported.
>>
>> Not true. ?It's supported.
>>
>> > ?How can I extract .tgz files using Python 3.0?
>> > Note that I probably can't depend on third party python modules, since
>> > I have yet to find many that support Python 3.0.
>>
>> > Thanks.
>>
>> It's hard to debug your code when you don't show us your code, ?so I
>> won't try.
>>
>> I can however supply a bit of working code:
>>
>> ?>>> import tarfile
>> ?>>> f=tarfile.open('f.tgz')
>> ?>>> f.list()
>> -rw-r--r-- gherron/gherron ? ? ? ?703 2009-03-14 15:59:46 t.py
>> -rw-r--r-- gherron/gherron ? ? ? ?566 2009-05-15 09:13:08 note-bzr-hg
>> -rw-r--r-- gherron/gherron ? ? ?11563 2009-04-24 09:33:12 .emacs
>>
>> So the module correctly reads the tar-gzip file, and finds its contents.
>>
>> Now, what is it you were trying to do?
>>
>> Gary Herron
>
> Okay so I managed to figure out the problem.
>
> Initially, I manually downloaded the TGZ above through Chrome and then
> opened it in WinRAR and extracted the files. Everything worked fine.
>
> Then, I ran my Python script which uses urlretrieve() to download the
> file and then tarfile is used to extract it. However, urlretrieve()
> was not downloading the full file because of a bug that was corrupting
> my URL.
>
> Sorry for the confusion, and thanks to everyone for the very prompt
> help!


Just to clarify:

A tar.gz is a gzipped tar archive. It's a normal tar file, processed
into a normal gzip file.

tar.bz2 is the same, but bzip2 instead of gzip.

So, if for some reason you want to do it yourself, just decompress the
data first, then handle it like a tar file.


From kay at fiber-space.de  Sat May 16 14:51:13 2009
From: kay at fiber-space.de (Kay Schluehr)
Date: Sat, 16 May 2009 11:51:13 -0700 (PDT)
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
	<50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com> 
	<mailman.216.1242408349.8015.python-list@python.org>
	<180531ca-33aa-47b9-9c69-5b5973f6b6f9@v35g2000pro.googlegroups.com>
Message-ID: <2bad50bb-d6ad-4ec1-9d81-e66b69f2aa40@e24g2000vbe.googlegroups.com>

> Since when is a list a number? Perhaps the help needs clarification,
> in line with the docs.

Everyone is supposed to use reduce() here ;)

Kay


From arnodel at googlemail.com  Sat May 16 15:17:30 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 16 May 2009 20:17:30 +0100
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
Message-ID: <m21vqoq2lx.fsf@googlemail.com>

"Emanuele D'Arrigo" <manu3d at gmail.com> writes:

> Hi everybody,
>
> let's assume I have a module with loads of classes inheriting from one
> class, from the same module, i.e.:
>
> ## myFile.py
> class SuperClass(object)
> class SubClass1(SuperClass)
> class SubClass2(SuperClass)
> class SubClass3(SuperClass)
>
> In a separate file I also have:
>
> ## myOtherFile.py
> class NewSuperClass(object)
>
> Now, let's also assume that myFile.py cannot be changed or it's
> impractical to do so. Is there a way to replace the SuperClass at
> runtime, so that when I instantiate one of the subclasses
> NewSuperClass is used instead of the original SuperClass provided by
> the first module module?
>
> That was the generic case. Would the solution change much if
> NewSuperClass was actually inheriting from SuperClass, effectively
> wedging itself between the SuperClass and the SubClasses?
>

Here is an attempt to do this.  Imagine there is a module 'modfoo.py'
like this:

--------------------------------------------------
class Base(object):
    def bar(self):
        print 'Base.bar'
    
class A(Base):
    def bar(self): 
        Base.bar(self)
        print 'A.bar'

class B(Base):
    def bar(self):
        super(B, self).bar()
        print 'B.bar'
--------------------------------------------------

The following script will patch the module so that all subclasses of
Base in module modfoo have their new superclass changed.  I called it
'patchfoo.py'.

--------------------------------------------------
import modfoo

# This is the new base
class Wedge(modfoo.Base):
    def bar(self):
        super(Wedge, self).bar()
        print 'Wedge.bar'

# Insert Wedge into each subclass of modfoo.Base
for subclass in modfoo.Base.__subclasses__():
    if subclass.__module__ != 'modfoo': continue
    attrs = dict(item for item in subclass.__dict__.items() 
                      if item[0][:2] != '__')
    name = subclass.__name__
    setattr(modfoo, name, type(name, (Wedge,), attrs))

# Replace modfoo.Base with Wedge
modfoo.Base = Wedge

# Tests
a = modfoo.A()
b = modfoo.B()

for obj in 'a' ,'b':
        call = '%s.bar()' % (obj,)
        print '-'*5, call
        exec call
--------------------------------------------------

Now let's try it:

marigold:junk arno$ python patchfoo.py 
----- a.bar()
Base.bar
Wedge.bar
A.bar
----- b.bar()
Base.bar
Wedge.bar
B.bar

Of course, there are plenty of ways this could break.

-- 
Arnaud


From arnodel at googlemail.com  Sat May 16 15:21:37 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 16 May 2009 20:21:37 +0100
Subject: Options for creating a statistics screen on a Mac with Python?
References: <64062d1f-b500-4ba2-9365-6f169bae82af@q2g2000vbr.googlegroups.com>
	<777skeF1g4b5gU1@mid.uni-berlin.de>
	<88270345-ede7-42b6-af27-b41e79461951@m24g2000vbp.googlegroups.com>
Message-ID: <m2ws8gonum.fsf@googlemail.com>

Phillip B Oldham <phillip.oldham at gmail.com> writes:

> On May 16, 2:15?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>> matplotlib should serve you well.
>
> Thanks, I'll check that out.
>
>> Or you use some web-based solution with a javascript-based chart library.
>
> I'd rather stay away from web-based solutions; since this is going to
> be running 24/7 and has a fixed a screen size. I'd prefer something
> that has few dependencies, if possible hooking into the OS X platform
> for graphics.

* You could create a pdf/png and pipe the output through to Preview.app
  which can display it in full screen.

* A simple and portable solution may be to use pygame

-- 
Arnaud


From fetchinson at googlemail.com  Sat May 16 16:02:13 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Sat, 16 May 2009 13:02:13 -0700
Subject: How to get Exif data from a jpeg file
In-Reply-To: <m263g1pbl7.fsf@googlemail.com>
References: <m263g1pbl7.fsf@googlemail.com>
Message-ID: <fbe2e2100905161302t1888aed0vcfe022ccf5c4f2ce@mail.gmail.com>

> I need to get the creation date from a jpeg file in Python.  Googling
> brought up a several references to apparently defunct modules.  The best
> way I have been able to find so far is something like this:
>
> from PIL import Image
> img = Image.open('img.jpg')
> exif_data = img._getexif()
> creation_date = exif_data[36867]
>
> Where 36867 is the exif tag for the creation date data (which I found by
> ooking at PIL.ExifTags.TAGS).  But this doesn't even seem to be
> documented in the PIL docs.  Is there a more natural way to do this?


Have you tried http://sourceforge.net/projects/exif-py/ ?

HTH,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From aahz at pythoncraft.com  Sat May 16 16:45:52 2009
From: aahz at pythoncraft.com (Aahz)
Date: 16 May 2009 13:45:52 -0700
Subject: Difference between list() and [] with dictionaries
References: <fe3354e50905151817ie4df792hebec03ae42eca25c@mail.gmail.com>
	<mailman.247.1242441988.8015.python-list@python.org>
Message-ID: <gun8m0$qtl$1@panix3.panix.com>

In article <mailman.247.1242441988.8015.python-list at python.org>,
Ned Deily  <nad at acm.org> wrote:
>In article 
><fe3354e50905151817ie4df792hebec03ae42eca25c at mail.gmail.com>,
> Sam Tregar <sam at tregar.com> wrote:
>>
>> Can anyone explain why this creates a list containing a
>> dictionary:
>>   [{'a': 'b', 'foo': 'bar'}] 
>> But this creates a list of keys of the dictionary:
>>   list({ "a": "b", "foo": "bar" })
>
>The first example is a list, expressed as a list display literal, 
>containing one object: a dictionary, expressed as a dictionary display 
>literal.
>
>The second example is a call to the built-in function "list",  [...]

Actually, list() is not a function:

>>> list
<type 'list'>

Rather, ``list`` is an object (specifically a ``type`` object) with a
__call__() method.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From aahz at pythoncraft.com  Sat May 16 16:57:50 2009
From: aahz at pythoncraft.com (Aahz)
Date: 16 May 2009 13:57:50 -0700
Subject: Python system with exemplary organization/coding style
References: <2009051416013116807-tomfsessile@gmailcom>
Message-ID: <gun9ce$6ps$1@panix3.panix.com>

In article <2009051416013116807-tomfsessile at gmailcom>,
TomF  <tomf.sessile at gmail.com> wrote:
>
>I'm looking for a medium-sized Python system with very good coding 
>style and good code organization, so I can learn from it.  I'm reading 
>various books on Python with advice on such things but I'd prefer to 
>see a real system.
>
>By medium-sized I mean 5-20 classes, 5-20 files, etc; a code base that 
>has some complexity but isn't overwhelming.

Actually, that's what I'd call "small".  "Medium" would be about 30-50
classes (Python mostly has multiple classes per file, unlike Java, so
number of files is usally a poor measure of complexity).  Something about
the right complexity level for what you're looking for can be found in
several parts of the Python standard library, including the thread,
threading, and Queue modules (although I haven't looked at the code
recently, so I can't vouch for its quality).

Another option would be dnspython, but that's getting a bit larger than
you're looking for.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From nad at acm.org  Sat May 16 17:32:58 2009
From: nad at acm.org (Ned Deily)
Date: Sat, 16 May 2009 14:32:58 -0700
Subject: Difference between list() and [] with dictionaries
References: <fe3354e50905151817ie4df792hebec03ae42eca25c@mail.gmail.com>
	<mailman.247.1242441988.8015.python-list@python.org>
	<gun8m0$qtl$1@panix3.panix.com>
Message-ID: <nad-246ECC.14325816052009@news.gmane.org>

In article <gun8m0$qtl$1 at panix3.panix.com>, aahz at pythoncraft.com (Aahz) 
wrote:
> In article <mailman.247.1242441988.8015.python-list at python.org>,
> Ned Deily  <nad at acm.org> wrote:
> >The second example is a call to the built-in function "list",  [...]
> Actually, list() is not a function: 
> >>> list
> <type 'list'>
> Rather, ``list`` is an object (specifically a ``type`` object) with a
> __call__() method.

Yes.  However, it is also true that "list" is listed under the Built-in 
Functions section of the Python Standard Library documentation and, wrt 
to explaining the OP's issue, quacks like a function here.

-- 
 Ned Deily,
 nad at acm.org



From manu3d at gmail.com  Sat May 16 18:35:31 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Sat, 16 May 2009 15:35:31 -0700 (PDT)
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
	<m21vqoq2lx.fsf@googlemail.com>
Message-ID: <a574d4b0-f84e-49a1-b911-5395eff952e7@e23g2000vbe.googlegroups.com>

On May 16, 8:17?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
> # Insert Wedge into each subclass of modfoo.Base
> for subclass in modfoo.Base.__subclasses__():
> ? ? if subclass.__module__ != 'modfoo': continue
> ? ? attrs = dict(item for item in subclass.__dict__.items()
> ? ? ? ? ? ? ? ? ? ? ? if item[0][:2] != '__')
> ? ? name = subclass.__name__
> ? ? setattr(modfoo, name, type(name, (Wedge,), attrs))
>
> # Replace modfoo.Base with Wedge
> modfoo.Base = Wedge

That-is-neat! I'm impressed. It took me a while to understand it all:
I didn't know about __subclasses__, the way you fill the dictionary is
completely novel to me and the use of type(name, tuple, attributes)
was also completely novel to me. But eventually I got it and it's
quite neat. Thank you.

> Of course, there are plenty of ways this could break.

Uh-oh. Ok, you got me all excited and now I have to read the fine
prints. So, how can it break?

Ciao!

Manu


From robert.kern at gmail.com  Sat May 16 18:55:11 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 16 May 2009 17:55:11 -0500
Subject: Python code-bloat tool-- warning n00b stuff...
In-Reply-To: <1a3a139e0905161013p2ff1c024l260ad57433e1be20@mail.gmail.com>
References: <1a3a139e0905161013p2ff1c024l260ad57433e1be20@mail.gmail.com>
Message-ID: <gung8f$q2s$1@ger.gmane.org>

On 2009-05-16 12:13, anand j wrote:
> Hi,
>      I am looking for a bunch of rules or a tool that takes the code for
> my python class and checks the amount of code bloat and points out where
> i can improve. I am a n00b to python and built an application linking
> wordnet and graph packages. but somehow have this nagging feeling my
> code is too bloated with too many functions..... might just be paranoia
> , but worth an investigation i guess.....
>
> Sorry if this is a repeat/trivial question, I could not find any
> comprehensive links on google or the mailing list archive that is within
> my gmail. Currently, trying to download the other archives and index
> using whoosh and try searching it.

Just use Google: "site:mail.python.org code bloat tool"

But basically, such a thing doesn't really exist. It's not really a quantifiable 
concept. You can use tools like pylint to enforce a simple policy (e.g. "no more 
than 50 methods per class"), but that's not really the same thing, nor is it 
something you can't do yourself with a little bit of grepping.

A slightly more interesting and nontrivial metric that you can apply is 
cyclomatic complexity. Basically, it is the number of independent code paths 
your each function may go down.

http://en.wikipedia.org/wiki/Cyclomatic_complexity
http://www.traceback.org/2008/03/31/measuring-cyclomatic-complexity-of-python-code/

This will give a not-too-unreasonable measure of how complicated each function 
is. I don't know if that's what you are getting at with the term "code bloat".

However, there is no substitute for experienced judgment. Show your code to 
other Pythonistas. What do they think? A quick question to an experienced 
programmer is usually much more efficient than downloading a tool and trying to 
interpret its results.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From arnodel at googlemail.com  Sat May 16 19:08:27 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 17 May 2009 00:08:27 +0100
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
	<m21vqoq2lx.fsf@googlemail.com>
	<a574d4b0-f84e-49a1-b911-5395eff952e7@e23g2000vbe.googlegroups.com>
Message-ID: <m2skj4odck.fsf@googlemail.com>

"Emanuele D'Arrigo" <manu3d at gmail.com> writes:

> On May 16, 8:17?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
>> # Insert Wedge into each subclass of modfoo.Base
>> for subclass in modfoo.Base.__subclasses__():
>> ? ? if subclass.__module__ != 'modfoo': continue
>> ? ? attrs = dict(item for item in subclass.__dict__.items()
>> ? ? ? ? ? ? ? ? ? ? ? if item[0][:2] != '__')
>> ? ? name = subclass.__name__
>> ? ? setattr(modfoo, name, type(name, (Wedge,), attrs))
>>
>> # Replace modfoo.Base with Wedge
>> modfoo.Base = Wedge
>
> That-is-neat! I'm impressed. It took me a while to understand it all:
> I didn't know about __subclasses__, the way you fill the dictionary is
> completely novel to me and the use of type(name, tuple, attributes)
> was also completely novel to me. But eventually I got it and it's
> quite neat. Thank you.
>
>> Of course, there are plenty of ways this could break.
>
> Uh-oh. Ok, you got me all excited and now I have to read the fine
> prints. So, how can it break?

I can think of 3 easy ways (and there may be more):

1. For simplicity I chose to ignore attributes that start with '__' but of
course in real life some of them would need to be included (__init__ &
co...).

2. It wouldn't work with multiple inheritance.

3. If the original classes are not just defined, but also used when the
module is loaded then this will cause problems.  E.g. imagine that the
file 'modfoo.py' in my example contains the additional line

    AA = A

Then when A is patched, AA will remain bound to the original class A,
and there is not much that can be done about this.


1. and 2. are only problems because my code was proof-of-concept and can
be addressed without difficulty I think.  

3. is a more serious limitation, but if your module doesn't use the
classes (i.e. it just defines them), then the method might work OK I
guess.

-- 
Arnaud


From sjmachin at lexicon.net  Sat May 16 20:14:50 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 16 May 2009 17:14:50 -0700 (PDT)
Subject: Parsing Strings in Enclosed in Curly Braces
References: <64bc68b6-45bc-4cb0-8f71-d9bf3156e859@z16g2000prd.googlegroups.com>
	<50697b2c0905150919l17769446lc54004511c4107ba@mail.gmail.com> 
	<mailman.216.1242408349.8015.python-list@python.org>
	<180531ca-33aa-47b9-9c69-5b5973f6b6f9@v35g2000pro.googlegroups.com>
	<gumm22$itv$1@panix3.panix.com>
Message-ID: <c6a17a5a-a22c-45c6-9f11-0ca6e78ad799@k9g2000pra.googlegroups.com>

On May 17, 1:28?am, a... at pythoncraft.com (Aahz) wrote:
> In article <180531ca-33aa-47b9-9c69-5b5973f6b... at v35g2000pro.googlegroups.com>,
> John Machin ?<sjmac... at lexicon.net> wrote:
> >Neat trick. However, from 2.6.2:
>
> >>>> help(sum)
> >Help on built-in function sum in module __builtin__:
>
> >sum(...)
> > ? ?sum(sequence[, start]) -> value
>
> > ? ?Returns the sum of a sequence of numbers (NOT strings) plus the
> >value
> > ? ?of parameter 'start' (which defaults to 0). ?When the sequence is
> > ? ?empty, returns start.
>
> >Since when is a list a number? Perhaps the help needs clarification,
> >in line with the docs.
>
> The primary use-case for sum() is numbers, with a special exception to
> prohibit using strings. ?Only strings are prohibited to allow using sum()
> with user-defined classes. ?That makes it a little difficult to document

Non sequitur.

> precisely in a summary; unless you can come up with a specific better
> wording, the docs will probably stay as-is. ?If you do come up with
> something better, please file it on bugs.python.org.

OK let's start with getting the docs right and then summarise that for
the help.
URI: http://docs.python.org/library/functions.html#sum
Contents:
"""
sum(iterable[, start])?

    Sums start and the items of an iterable from left to right and
returns the total. start defaults to 0. The iterable?s items are
normally numbers, and are not allowed to be strings. The fast, correct
way to concatenate a sequence of strings is by calling ''.join
(sequence). Note that sum(range(n), m) is equivalent to reduce
(operator.add, range(n), m) To add floating point values with extended
precision, see math.fsum().

    New in version 2.3
"""
Suggestions:
(1) fix what should be an apostrophe in "iterable's"
(2) s/sequence/iterable/g
(3) Either replace the sentence about "reduce" by "Note that sum
(iterable, start) is equivalent to reduce(operator.add, iterable,
start) except for the prohibition of strings" or explain why not or
what's so special about range(n).
(4) Add a full stop after the sentence about "reduce".

Help from 2.6.2:
"""
    sum(sequence[, start]) -> value

    Returns the sum of a sequence of numbers (NOT strings) plus the
value
    of parameter 'start' (which defaults to 0).  When the sequence is
    empty, returns start.
"""
Suggested replacement:
"""
    sum(iterable[, start]) -> value

    Returns the sum of the contents of the iterable plus the value
    of parameter 'start' (which defaults to 0).  When the iterable is
    empty, returns start. Strings are disallowed; use
    ''.join(iterable) to concatenate strings efficiently.
"""

Cheers,
John


From aahz at pythoncraft.com  Sat May 16 20:26:21 2009
From: aahz at pythoncraft.com (Aahz)
Date: Sat, 16 May 2009 17:26:21 -0700
Subject: Concurrency Email List
In-Reply-To: <2F8C1929-B58D-4845-A237-EFAEE8BF753D@pobox.com>
References: <2F8C1929-B58D-4845-A237-EFAEE8BF753D@pobox.com>
Message-ID: <20090517002621.GA18009@panix.com>

[posted and e-mailed]

On Sat, May 16, 2009, Pete wrote:
>
> python-concurrency at googlegroups.com is a new email list for discussion  
> of concurrency issues in python.  It arose out of Dave Beazley's class  
> on the subject last week: http://www.dabeaz.com/chicago/concurrent.html
>
> The list wills serve as a forum for discussion of such topics as:
>
> * threads
> * multiprocessing
> * asynchronous
> * coroutines
> * the GIL
>
> Hope to see you there!  Join at http://groups.google.com/group/python-concurrency/

Is there some reason you chose not to create a list on python.org?  I'm
not joining the list because Google requires that you create a login.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From ben+python at benfinney.id.au  Sat May 16 20:50:23 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 17 May 2009 10:50:23 +1000
Subject: Context manager, atexit processing, and PEP 3143 DaemonContext.close
Message-ID: <87bppsa6y8.fsf@benfinney.id.au>

Howdy all,

I'm slowly developing PEP 3143 and, in parallel, its reference
implementation, the ?python-daemon? library
<URL:http://pypi.python.org/pypi/python-daemon/>. Feedback continues to
be welcome from people wanting to make a program become a daemon; please
try it out and critique the specification and/or the implementation.

Today a flaw has been uncovered by Pavol Babin??k. In diagnosing an
issue, we doscovered that PEP 3143 currently leads, in some common
circumstances, to exiting a context manager twice.

The current specification of the `DaemonContext` class says:

=====
close()
    Return:     None

    Close the daemon context. This performs the following step:

        * If the pidfile attribute is not None, exit its context
          manager.
=====

and:

=====
__exit__(exc_type, exc_value, exc_traceback)
    Return:        True or False as defined by the context manager
    protocol

    Call the instance's close() method, then return True if the
    exception was handled or False if it was not.
=====

but also:

=====
open()
    Return:     None

    Open the daemon context, turning the current program into a daemon
    process. This performs the following steps:
[?]

        * Register the close method to be called during Python's exit
          processing.
=====


This leads to the situation where the `DaemonContext.close` method can
be called twice:

    pidfile = FunkyLockFile()
    daemon_context = daemon.DaemonContext(pidfile=pidfile)
    with daemon_context:
        main_processing()

According to the current specification, this will cause
`daemon_context.close()` to be called on exiting its context manager (at
the end of the `with` suite) *and* on program exit (via `atexit`
processing).

This will cause the `pidfile` context manager to be exited twice in
succession, which surely can't be good and is at least undefined AFAICT.


How should a context manager be implemented to handle situations like
this? One possible way is to raise an exception when trying to close a
not-open context manager. Another is to return immediately if the
attempt is made, making it safe to try closing a context manager
multiple times.

The ?Register the close method to be called during Python's exit
processing? is there to ensure clean-up occurs even if the program
isn't using the DaemonContext as a context manager. Ideally, what I'd
like to do is *un*-register the `close` method after having already
closed it, so that exit processing *won't* call it. The `atexit` module,
though, doesn't appear to give me that option.

Ideas? How should this be addressed both Pythonically and respecting the
intent of PEP 3143?

-- 
 \       ?For fast acting relief, try slowing down.? ?Jane Wagner, via |
  `\                                                       Lily Tomlin |
_o__)                                                                  |
Ben Finney


From steve at REMOVE-THIS-cybersource.com.au  Sat May 16 21:37:45 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 17 May 2009 01:37:45 GMT
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
Message-ID: <021f5d69$0$20645$c3e8da3@news.astraweb.com>

On Sat, 16 May 2009 09:55:39 -0700, Emanuele D'Arrigo wrote:

> Hi everybody,
> 
> let's assume I have a module with loads of classes inheriting from one
> class, from the same module, i.e.:
[...]
> Now, let's also assume that myFile.py cannot be changed or it's
> impractical to do so. Is there a way to replace the SuperClass at
> runtime, so that when I instantiate one of the subclasses NewSuperClass
> is used instead of the original SuperClass provided by the first module
> module?

That's called "monkey patching" or "duck punching".

http://en.wikipedia.org/wiki/Monkey_patch

http://wiki.zope.org/zope2/MonkeyPatch

http://everything2.com/title/monkey%2520patch



-- 
Steven


From thomas.vogel at likeabird.de  Sat May 16 21:52:46 2009
From: thomas.vogel at likeabird.de (Thomas Vogel)
Date: Sun, 17 May 2009 03:52:46 +0200
Subject: UDP reading on multiple sockets
Message-ID: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net>

Hi all,

I'm currently have the problem that I try to read UDP messages from 
multiple sockets in parallel. So let's say I get UDP packets from the 
same IP on the ports 2000, 2001, 2002,...

Therefore I created the following class.
But if I try to instantiate it several times with different ports I 
experience that if I get a broadcast message all ports are waking up, 
the 1st socket is using the message and the others close itself as the 
buffer is empty.

Does anybody have an idea how to do this in a better way?
I just need non-blocking UDP-receiver that are listening on several 
ports in parallel and return me the incomming messages. Are there 
examples in the net that describe this problem?

class Receiver(asyncore.dispatcher, threading.Thread):
     '''
     This is the command receiver entity.
     '''

     def __init__(self, api, localIp, localPort):

         asyncore.dispatcher.__init__(self)
         threading.Thread.__init__(self)
         self.create_socket(socket.AF_INET, socket.SOCK_DGRAM)
         self.bind((localIp, localPort))
         self.cv = threading.Condition()
         self.data = []
         self.sorbasApi = api

     def handle_connect(self):
         return

     def writable(self):
         return False

     def handle_error(self):
         self.logger.error('error')
         return asyncore.dispatcher.handle_error(self)

     def handle_read(self):
         s = self.recv(4096)
         self.cv.acquire()
         self.data.append(s)
         self.cv.notifyAll()
         self.cv.release()

     def handle_close(self):
         self.close()

     def run(self):
         asyncore.loop()

     def flush(self):
         self.data = []

     def readNextMsg(self, paramSet, timeout=1):
         if len(self.data) == 0:
             self.cv.acquire()
             self.cv.wait(timeout)
             self.cv.release()
         if len(self.data) > 0:
             buffer = array('B', self.data.pop(0)).tolist()
             m = ReceiveMessage(self.sorbasApi, paramSet)
             m.decode(buffer)
             return m
         else:
             return None

     def __del__(self):
         self.close()

Thanks a lot in advance
Thomas


From grante at visi.com  Sat May 16 22:22:25 2009
From: grante at visi.com (Grant Edwards)
Date: Sat, 16 May 2009 21:22:25 -0500
Subject: UDP reading on multiple sockets
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net>
Message-ID: <15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>

On 2009-05-17, Thomas Vogel <thomas.vogel at likeabird.de> wrote:

> I'm currently have the problem that I try to read UDP messages from 
> multiple sockets in parallel. So let's say I get UDP packets from the 
> same IP on the ports 2000, 2001, 2002,...

Is there any reason you can't do it the easy way by using
select?

http://docs.python.org/library/select.html

-- 
Grant



From pavlovevidence at gmail.com  Sat May 16 23:01:31 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 16 May 2009 20:01:31 -0700 (PDT)
Subject: Context manager, atexit processing, and PEP 3143 
	DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
Message-ID: <d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>

On May 16, 5:50?pm, Ben Finney <ben+pyt... at benfinney.id.au> wrote:
> Ideas? How should this be addressed both Pythonically and respecting the
> intent of PEP 3143?


There's already precedent for what to do in the Python library.

Python 2.5.2 (r252:60911, Jan  4 2009, 17:40:26)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> f = open('somefile')
>>> f.close()
>>> f.close()
>>> f.close()
>>> f.close()


Is a context manager really necessary here?  It's not like daemon
processes can reattach themselves to the terminal when they're done
being a daemon.  What's the use case for being able to partially clean
up before program exit?


Carl Banks


From ben+python at benfinney.id.au  Sat May 16 23:20:39 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 17 May 2009 13:20:39 +1000
Subject: Context manager, atexit processing,
	and PEP 3143  DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
Message-ID: <87tz3k8lfc.fsf@benfinney.id.au>

Carl Banks <pavlovevidence at gmail.com> writes:

> There's already precedent for what to do in the Python library.
> 
> Python 2.5.2 (r252:60911, Jan  4 2009, 17:40:26)
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> f = open('somefile')
> >>> f.close()
> >>> f.close()
> >>> f.close()
> >>> f.close()

Yes, that's a precedent in favour of ?silently return immediately when
closing an already-closed DaemonContext?. I'm not about to assume that
it's the *only* relevant precedent.

> Is a context manager really necessary here? It's not like daemon
> processes can reattach themselves to the terminal when they're done
> being a daemon. What's the use case for being able to partially clean
> up before program exit?

The use case is::

    pidfile = MyChoiceOfLockFile()
    daemon_context = daemon.DaemonContext(pidfile=pidfile)

    with daemon_context:
        do_main_processing()

which could easily become something like::

    beans_resource = crunchy_init()

    with beans_resource:

        spam_resource = crispy_init()

        pidfile = MyChoiceOfLockFile()
        daemon_context = daemon.DaemonContext(pidfile=pidfile)

        with daemon_context:
            do_main_processing()

        spam_resource.cleanup()

In other words, the DaemonContext has a specific job, and is easier to
use if it can be relied on to clean up its own stuff via a context
manager; but the larger program could easily have other things (in the
example above, both of `spam_resource` and `beans_resource`) it needs to
clean up apart from just the daemon context.

-- 
 \     ?We reserve the right to serve refuse to anyone. ? ?restaurant, |
  `\                                                             Japan |
_o__)                                                                  |
Ben Finney


From rtomek at ceti.com.pl  Sat May 16 23:32:46 2009
From: rtomek at ceti.com.pl (Tomasz Rola)
Date: Sun, 17 May 2009 05:32:46 +0200
Subject: Nimrod programming language
In-Reply-To: <f8dfc0a0-8f8e-4f54-ab45-2ae4e5e60bfe@t11g2000vbc.googlegroups.com>
References: <159308160@web.de>
	<mailman.5390.1241977162.11746.python-list@python.org>
	<d201b2cb-4b13-4970-a44b-9be1b553e293@j12g2000vbl.googlegroups.com> 
	<Pine.LNX.4.64.0905120140001.2367@tau.ceti.pl>
	<f8dfc0a0-8f8e-4f54-ab45-2ae4e5e60bfe@t11g2000vbc.googlegroups.com>
Message-ID: <Pine.LNX.4.64.0905170458330.24790@tau.ceti.pl>

On Mon, 11 May 2009, kay at fiber-space.de wrote:

> On 12 Mai, 02:10, Tomasz Rola <rto... at ceti.com.pl> wrote:
> > On Mon, 11 May 2009, rump... at web.de wrote:
> > > > One question I ask myself upon seeing a new language is if it is possible
> > > > to program amb (amb=ambiguous) operator in it. This page gives a very
> > > > nice, "code first" explanation of amb and how it is supposed to work:
> >
> > > >http://www.randomhacks.net/articles/2005/10/11/amb-operator
> >
> > > Hm. I am not sure either. To me, it looks like a constraint solver by
> > > using brute force.
> >
> > Yes, kind of. From what I understand [1], it's goal is to simulate
> > nondeterministic "get right answer in one try", only this "one try"
> > requires browsing the solution space (because we have only "classic"
> > hardware). It is easy to use amb in wrong way, but I can see some cases
> > when I would like it.
> 
> In Python you can use a generator expression. Dan Piponis example can
> be stated as
> 
> g = ((i,j) for i in range(2,100) for j in range(2,i) if i*j == 481)
> 
> which doesn't require any call/cc hacks but is a deterministic "get
> right in one try". Once Nimrod has coroutines it's just a matter of
> sugaring them into comprehensions.

Yep, to be frank everything complicated can be achieved by means of a 
"for" loop (so said one friend of mine, and this is dirty, dirty way of 
thinking). Or putting generators in a row... but try to do this trick 
with ten of them and things start to look messy. Or ugly. Or both - and I 
don't like neither.

There is another example, below Don Piponis' one. I like the look of 
simplicity. I don't like ten or seven nested loops, that would have been 
used instead. Perhaps amb could be somehow simulated with recursion, but 
to use recursion in a language, I need to know it is safe and doesn't 
overflow on 50th call. So, either I use the language that allows me to 
express things in a way appealing to my taste, or I use something else and 
perhaps end up with nested loops.

Besides, having search space defined with amb-statements may allow me to 
try other ideas than brute-force search. Like, say, genetic algorithm 
under the hood. No change to program, just link with other library (import 
amb's definition from other path etc). I cannot imagine trying such trick 
with nested loops without writing new program (writing new loop(s)).

Generators don't give me nice looking alternative to amb. So, if the 
problem requires two or three nested loops, ok, I can go for it. If more - 
I want another way out. Just my personal opinion, not forcing anybody to 
follow.

However, the question I wanted to be answered, was how far Nimrod would 
allow me to go. I've got my answer and, well, for some near future I will 
just sit and see what happens. So, discussing amb's usefulness or if the 
same ca be done with whatever else is not very interesting, because of 
course everything can be done with loops - no need for continuations, 
coroutines, recursion, macros etc.

Regards
Tomasz Rola

--
** A C programmer asked whether computer had Buddha's nature.      **
** As the answer, master did "rm -rif" on the programmer's home    **
** directory. And then the C programmer became enlightened...      **
**                                                                 **
** Tomasz Rola          mailto:tomasz_rola at bigfoot.com             **


From robin at alldunn.com  Sun May 17 01:31:08 2009
From: robin at alldunn.com (Robin Dunn)
Date: Sat, 16 May 2009 22:31:08 -0700
Subject: ANN: wxPython 2.8.10.1
Message-ID: <4A0FA11C.6000807@alldunn.com>

Announcing
----------

The 2.8.10.1 release of wxPython is now available for download at
http://wxpython.org/download.php.  This release fixes the problem with 
using Python 2.6's default manifest, and updates wxcairo to work with 
the latest PyCairo.  A summary of changes is listed below and also
at http://wxpython.org/recentchanges.php.

Source code is available as a tarball and a source RPM, as well as
binaries for Python 2.4, 2.5 and 2.6, for Windows and Mac, as well
some packages for various Linux distributions.



What is wxPython?
-----------------

wxPython is a GUI toolkit for the Python programming language. It
allows Python programmers to create programs with a robust, highly
functional graphical user interface, simply and easily. It is
implemented as a Python extension module that wraps the GUI components
of the popular wxWidgets cross platform library, which is written in
C++.

wxPython is a cross-platform toolkit. This means that the same program
will usually run on multiple platforms without modifications.
Currently supported platforms are 32-bit and 64-bit Microsoft Windows,
most Linux or other Unix-like systems using GTK2, and Mac OS X 10.4+.
In most cases the native widgets are used on each platform to provide
a 100% native look and feel for the application.



Changes in 2.8.10.1
-------------------

wx.grid.Grid:  Added methods CalcRowLabelsExposed,
CalcColLabelsExposed, CalcCellsExposed, DrawRowLabels, DrawRowLabel,
DrawColLabels, and DrawColLabel to the Grid class.

Added the wx.lib.mixins.gridlabelrenderer module.  It enables the use
of label renderers for Grids that work like the cell renderers do.  See
the demo for a simple sample.

Solved the manifests problem with Python 2.6 on Windows.  wxPython now
programatically creates its own activation context and loads a
manifest in that context that specifies the use of the themable common
controls on Windows XP and beyond.  This also means that the external
manifest files are no longer needed for the other versions of Python.

wx.Colour: Updated the wx.Colour typemaps and also the wx.NamedColour
constructor to optionally allow an alpha value to be passed in the
color string, using these syntaxes:  "#RRGGBBAA" or "ColourName:AA"

wx.lib.wxcairo:  Fixed a problem resulting from PyCairo changing the
layout of their C API structure in a non-binary compatible way.  The
new wx.lib.wxcairo is known to now work with PyCairo 1.6.4 and 1.8.4,
and new binaries for Windows are available online at
http://wxpython.org/cairo/

-- 
Robin Dunn
Software Craftsman
http://wxPython.org



From pavlovevidence at gmail.com  Sun May 17 01:33:47 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 16 May 2009 22:33:47 -0700 (PDT)
Subject: Context manager, atexit processing, and PEP 3143 
	DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
Message-ID: <70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>

On May 16, 8:20?pm, Ben Finney <ben+pyt... at benfinney.id.au> wrote:
> Carl Banks <pavlovevide... at gmail.com> writes:
> > There's already precedent for what to do in the Python library.
>
> > Python 2.5.2 (r252:60911, Jan ?4 2009, 17:40:26)
> > [GCC 4.3.2] on linux2
> > Type "help", "copyright", "credits" or "license" for more information.
> > >>> f = open('somefile')
> > >>> f.close()
> > >>> f.close()
> > >>> f.close()
> > >>> f.close()
>
> Yes, that's a precedent in favour of ?silently return immediately when
> closing an already-closed DaemonContext?. I'm not about to assume that
> it's the *only* relevant precedent.

I don't think this is anything more than a trivial consideration,
which should warrant nothing more than the simplest solution possible,
which is to simply allow multiple clean up calls.

That one of Python's most fundamental types allows its clean-up
operation to be invoked safely on an already-cleaned up object is
precedent enough, given the triviality of the issue.

You're welcome to your own assessment of the problem's importance.


Carl Banks


From gagsl-py2 at yahoo.com.ar  Sun May 17 01:41:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 17 May 2009 02:41:21 -0300
Subject: KeyboardInterrupt catch does not shut down the socketserver
References: <mailman.183.1242371089.8015.python-list@python.org>
	<guj8dv$5sl$2@lust.ihug.co.nz>
	<mailman.185.1242375959.8015.python-list@python.org>
	<gujl41$d0r$2@lust.ihug.co.nz> <4A0D5A35.3010008@gmail.com>
	<op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>
	<4A0E6563.2070400@gmail.com>
Message-ID: <op.ut17e7twx6zn5v@gabriel.sleipnir-bsas>

En Sat, 16 May 2009 04:04:03 -0300, Igor Katson <descentspb at gmail.com>  
escribi?:
> Gabriel Genellina wrote:
>> En Fri, 15 May 2009 09:04:05 -0300, Igor Katson escribi?:
>>> Lawrence D'Oliveiro wrote:
>>>> In message <mailman.185.1242375959.8015.python-list at python.org>, Igor  
>>>> Katson wrote:
>>>>> Lawrence D'Oliveiro wrote:
>>>>>> In message <mailman.183.1242371089.8015.python-list at python.org>,  
>>>>>> Igor Katson wrote:
>>>>>>
>>>>>>> I have problems in getting a SocketServer to shutdown.
>>> Shutdown implies closing the listening socket, doesn't it?
>>
>> No (perhaps it should, but that is another issue). There is a
>> documentation bug; BaseServer.shutdown is documented as "Tells the
>> serve_forever() loop to stop and waits until it does." [1]
>> The docstring is much more explicit: """Stops the serve_forever loop.
>> Blocks until the loop has finished. This must be called while
>> serve_forever() is running in another thread, or it will deadlock."""
>>
>> So, if you have a single-threaded server, *don't* use shutdown(). And,  
>> to orderly close the listening socket, use server_close() instead. Your

> Hmm. Gabriel, could you please show the same for the threaded version?  
> This one deadlocks:
> [code removed]

The shutdown method should *only* be called while serve_forever is  
running. If called after server_forever exited, shutdown() blocks forever.

<code>
 from SocketServer import TCPServer, BaseRequestHandler
 from threading import Thread

server = TCPServer(('localhost',1234), BaseRequestHandler)
run_thread = Thread(target=server.serve_forever)
run_thread.start()
try:
     print "press ^C to exit"
     import time; time.sleep(30)
except KeyboardInterrupt:
     print "^C detected"
     pass
server.shutdown()
run_thread.join()
print "bye"
</code>

But, what are you after, exactly? I think I'd use the above code only in a  
GUI application with a background server.
There are other alternatives, like asyncore or Twisted.

-- 
Gabriel Genellina



From ben+python at benfinney.id.au  Sun May 17 01:46:22 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 17 May 2009 15:46:22 +1000
Subject: Context manager, atexit processing,
	and PEP 3143  DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>
Message-ID: <87hbzk8eoh.fsf@benfinney.id.au>

Carl Banks <pavlovevidence at gmail.com> writes:

> I don't think this is anything more than a trivial consideration,

Okay, thank you.

Anyone else?

-- 
 \         ?All television is educational television. The question is: |
  `\                           what is it teaching?? ?Nicholas Johnson |
_o__)                                                                  |
Ben Finney


From tjreedy at udel.edu  Sun May 17 02:08:01 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 17 May 2009 02:08:01 -0400
Subject: Swapping superclass from a module
In-Reply-To: <021f5d69$0$20645$c3e8da3@news.astraweb.com>
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
	<021f5d69$0$20645$c3e8da3@news.astraweb.com>
Message-ID: <guo9k1$6vp$1@ger.gmane.org>

Steven D'Aprano wrote:
> On Sat, 16 May 2009 09:55:39 -0700, Emanuele D'Arrigo wrote:
> 
>> Hi everybody,
>>
>> let's assume I have a module with loads of classes inheriting from one
>> class, from the same module, i.e.:
> [...]
>> Now, let's also assume that myFile.py cannot be changed or it's
>> impractical to do so. Is there a way to replace the SuperClass at
>> runtime, so that when I instantiate one of the subclasses NewSuperClass
>> is used instead of the original SuperClass provided by the first module
>> module?
> 
> That's called "monkey patching" or "duck punching".
> 
> http://en.wikipedia.org/wiki/Monkey_patch
> 
> http://wiki.zope.org/zope2/MonkeyPatch
> 
> http://everything2.com/title/monkey%2520patch

If the names of superclasses is resolved when classes are instantiated, 
the patching is easy.  If, as I would suspect, the names are resolved 
when the classes are created, before the module becomes available to the 
importing code, then much more careful and extensive patching would be 
required, if it is even possible.  (Objects in tuples cannot be 
replaced, and some attributes are not writable.)

tjr



From michele.simionato at gmail.com  Sun May 17 02:54:20 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Sat, 16 May 2009 23:54:20 -0700 (PDT)
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
Message-ID: <8c92fb11-1d62-43fb-9082-ef890bd16f5e@l32g2000vba.googlegroups.com>

Try this:

class Base(object):
    pass

class C(Base):
    pass

class NewBase(object):
    pass

C.__bases__ = (NewBase,)

help(C)


From rustompmody at gmail.com  Sun May 17 03:09:39 2009
From: rustompmody at gmail.com (rustom)
Date: Sun, 17 May 2009 00:09:39 -0700 (PDT)
Subject: using urlretrive/urlopen
References: <f46c52560905150803i15ad7968m5fc13738906f8e7d@mail.gmail.com> 
	<mailman.242.1242437704.8015.python-list@python.org>
Message-ID: <9153b54b-8cd8-4d7a-b7a7-46b90f9c5367@j18g2000prm.googlegroups.com>

On May 16, 6:30?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Fri, 15 May 2009 12:03:09 -0300, Rustom Mody <rustompm... at gmail.com> ?
> escribi?:
>
> > I am trying to talk to a server that runs on localhost
> > The server runs onhttp://localhost:7000/and that opens alright in? a
> > web browser.
>
> > However if I use urlopen or urlretrieve what I get is this 'file' --
> > obviously not the one that the browser gets:
>
> > <html><body bgcolor="#ffffff">
> > Query 'http://localhost:7000/'not implemented
> > </body></html>
> > Any tips/clues?
>
> Please post the code you're using to access the server.
> Do you have any proxy set up?
>
> --
> Gabriel Genellina

Thanks Gabriel!

urlopen("http://localhost:7000", proxies={})
seems to be what I needed.


From __peter__ at web.de  Sun May 17 03:24:32 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 17 May 2009 09:24:32 +0200
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
	<021f5d69$0$20645$c3e8da3@news.astraweb.com>
	<mailman.272.1242540495.8015.python-list@python.org>
Message-ID: <guoe2u$ra8$02$1@news.t-online.com>

Terry Reedy wrote:

> Steven D'Aprano wrote:
>> On Sat, 16 May 2009 09:55:39 -0700, Emanuele D'Arrigo wrote:
>> 
>>> Hi everybody,
>>>
>>> let's assume I have a module with loads of classes inheriting from one
>>> class, from the same module, i.e.:
>> [...]
>>> Now, let's also assume that myFile.py cannot be changed or it's
>>> impractical to do so. Is there a way to replace the SuperClass at
>>> runtime, so that when I instantiate one of the subclasses NewSuperClass
>>> is used instead of the original SuperClass provided by the first module
>>> module?
>> 
>> That's called "monkey patching" or "duck punching".
>> 
>> http://en.wikipedia.org/wiki/Monkey_patch
>> 
>> http://wiki.zope.org/zope2/MonkeyPatch
>> 
>> http://everything2.com/title/monkey%2520patch
> 
> If the names of superclasses is resolved when classes are instantiated,
> the patching is easy.  If, as I would suspect, the names are resolved
> when the classes are created, before the module becomes available to the
> importing code, then much more careful and extensive patching would be
> required, if it is even possible.  (Objects in tuples cannot be
> replaced, and some attributes are not writable.)

It may be sufficient to patch the subclasses:

$ cat my_file.py
class Super(object):
    def __str__(self):
        return "old"

class Sub(Super):
    def __str__(self):
        return "Sub(%s)" % super(Sub, self).__str__()

class Other(object):
    pass

class SubSub(Sub, Other):
    def __str__(self):
        return "SubSub(%s)" % super(SubSub, self).__str__()

if __name__ == "__main__":
    print Sub()

$ cat main2.py
import my_file
OldSuper = my_file.Super

class NewSuper(OldSuper):
    def __str__(self):
        return "new" + super(NewSuper, self).__str__()

my_file.Super = NewSuper
for n, v in vars(my_file).iteritems():
    if v is not NewSuper:
        try:
            bases = v.__bases__
        except AttributeError:
            pass
        else:
            if OldSuper in bases:
                print "patching", n
                v.__bases__ = tuple(NewSuper if b is OldSuper else b
                                    for b in bases)


print my_file.Sub()
print my_file.SubSub()
$ python main2.py
patching Sub
Sub(newold)
SubSub(Sub(newold))

Peter



From arnodel at googlemail.com  Sun May 17 04:17:06 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 17 May 2009 09:17:06 +0100
Subject: How to get Exif data from a jpeg file
References: <m263g1pbl7.fsf@googlemail.com>
	<mailman.265.1242504138.8015.python-list@python.org>
Message-ID: <m2octsnny5.fsf@googlemail.com>

Daniel Fetchinson <fetchinson at googlemail.com> writes:

>> I need to get the creation date from a jpeg file in Python.  Googling
>> brought up a several references to apparently defunct modules.  The best
>> way I have been able to find so far is something like this:
>>
>> from PIL import Image
>> img = Image.open('img.jpg')
>> exif_data = img._getexif()
>> creation_date = exif_data[36867]
>>
>> Where 36867 is the exif tag for the creation date data (which I found by
>> ooking at PIL.ExifTags.TAGS).  But this doesn't even seem to be
>> documented in the PIL docs.  Is there a more natural way to do this?
>
>
> Have you tried http://sourceforge.net/projects/exif-py/ ?
>
> HTH,
> Daniel

I will have a look - thank you.

-- 
Arnaud


From descentspb at gmail.com  Sun May 17 04:20:33 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sun, 17 May 2009 12:20:33 +0400
Subject: KeyboardInterrupt catch does not shut down the socketserver
In-Reply-To: <op.ut17e7twx6zn5v@gabriel.sleipnir-bsas>
References: <mailman.183.1242371089.8015.python-list@python.org>	<guj8dv$5sl$2@lust.ihug.co.nz>	<mailman.185.1242375959.8015.python-list@python.org>	<gujl41$d0r$2@lust.ihug.co.nz>
	<4A0D5A35.3010008@gmail.com>	<op.utzwhys2x6zn5v@lepton.softlabbsas.com.ar>	<4A0E6563.2070400@gmail.com>
	<op.ut17e7twx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <4A0FC8D1.1020303@gmail.com>

Gabriel Genellina wrote:
> En Sat, 16 May 2009 04:04:03 -0300, Igor Katson <descentspb at gmail.com> 
> escribi?:
>> Gabriel Genellina wrote:
>>> En Fri, 15 May 2009 09:04:05 -0300, Igor Katson escribi?:
>>>> Lawrence D'Oliveiro wrote:
>>>>> In message <mailman.185.1242375959.8015.python-list at python.org>, 
>>>>> Igor Katson wrote:
>>>>>> Lawrence D'Oliveiro wrote:
>>>>>>> In message <mailman.183.1242371089.8015.python-list at python.org>, 
>>>>>>> Igor Katson wrote:
>>>>>>>
>>>>>>>> I have problems in getting a SocketServer to shutdown.
>>>> Shutdown implies closing the listening socket, doesn't it?
>>>
>>> No (perhaps it should, but that is another issue). There is a
>>> documentation bug; BaseServer.shutdown is documented as "Tells the
>>> serve_forever() loop to stop and waits until it does." [1]
>>> The docstring is much more explicit: """Stops the serve_forever loop.
>>> Blocks until the loop has finished. This must be called while
>>> serve_forever() is running in another thread, or it will deadlock."""
>>>
>>> So, if you have a single-threaded server, *don't* use shutdown(). 
>>> And, to orderly close the listening socket, use server_close() 
>>> instead. Your
>
>> Hmm. Gabriel, could you please show the same for the threaded 
>> version? This one deadlocks:
>> [code removed]
>
> The shutdown method should *only* be called while serve_forever is 
> running. If called after server_forever exited, shutdown() blocks 
> forever.
>
> [code removed]
> But, what are you after, exactly? I think I'd use the above code only 
> in a GUI application with a background server.
> There are other alternatives, like asyncore or Twisted.
For now, I am just using server.server_close() and it works. The server 
itself is an external transaction manager for PostgreSQL, when a client 
connects to it, serialized data interchange beetween the server and the 
client starts, e.g. first the client sends data, then the server sends 
data, then again the client, then the server and so on.
I haven't used asyncore or Twisted yet, and didn't know about their 
possible usage while writing the project. I'll research in that direction.



From davidb at panix.com  Sun May 17 05:22:24 2009
From: davidb at panix.com (David M. Besonen)
Date: Sun, 17 May 2009 02:22:24 -0700
Subject: Concurrency Email List
In-Reply-To: <20090517002621.GA18009@panix.com>
References: <2F8C1929-B58D-4845-A237-EFAEE8BF753D@pobox.com>
	<20090517002621.GA18009@panix.com>
Message-ID: <4A0FD750.7080909@panix.com>

On 5/16/2009 5:26 PM, Aahz wrote:

> On Sat, May 16, 2009, Pete wrote:
>
>> python-concurrency at googlegroups.com is a new email list
>> for discussion of concurrency issues in python.
>
> Is there some reason you chose not to create a list on
> python.org?  I'm not joining the list because Google
> requires that you create a login.

i too would join if it was hosted at python.org, and will not
if it's hosted at google for the same reason.


  -- david



From nytrokiss at gmail.com  Sun May 17 05:39:54 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 17 May 2009 12:39:54 +0300
Subject: Concurrency Email List
In-Reply-To: <4A0FD750.7080909@panix.com>
References: <2F8C1929-B58D-4845-A237-EFAEE8BF753D@pobox.com>
	<20090517002621.GA18009@panix.com> <4A0FD750.7080909@panix.com>
Message-ID: <8a6b8e350905170239i5f0fb8et33ce201edea60bca@mail.gmail.com>

I second this. Google groups are annoying! Just request that it be added to
python.org

James

On Sun, May 17, 2009 at 12:22 PM, David M. Besonen <davidb at panix.com> wrote:

> On 5/16/2009 5:26 PM, Aahz wrote:
>
> > On Sat, May 16, 2009, Pete wrote:
> >
> >> python-concurrency at googlegroups.com is a new email list
> >> for discussion of concurrency issues in python.
> >
> > Is there some reason you chose not to create a list on
> > python.org?  I'm not joining the list because Google
> > requires that you create a login.
>
> i too would join if it was hosted at python.org, and will not
> if it's hosted at google for the same reason.
>
>
>  -- david
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 

http://www.goldwatches.com/
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From nytrokiss at gmail.com  Sun May 17 05:46:24 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 17 May 2009 12:46:24 +0300
Subject: Your Favorite Python Book
In-Reply-To: <pecora-532361.12051215052009@ra.nrl.navy.mil>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<mailman.6.1242078341.8015.python-list@python.org>
	<e1db4ac7-4997-401b-9a1f-112787a9ed92@r3g2000vbp.googlegroups.com>
	<pecora-532361.12051215052009@ra.nrl.navy.mil>
Message-ID: <8a6b8e350905170246r30b374e6m70cf1de58962b7a8@mail.gmail.com>

For me it's any book on Django, Core Python 2nd Edition (which I will buy if
updated) and Python Power.



On Fri, May 15, 2009 at 7:05 PM, Lou Pecora <pecora at anvil.nrl.navy.mil>wrote:

> In article
> <e1db4ac7-4997-401b-9a1f-112787a9ed92 at r3g2000vbp.googlegroups.com>,
>  Mike Driscoll <kyosohma at gmail.com> wrote:
>
> > On May 11, 4:45 pm, Chris Rebert <c... at rebertia.com> wrote:
>
> > >
> > > I like "Python in a Nutshell" as a reference book, although it's now
> > > slightly outdated given Python 3.0's release (the book is circa 2.5).
> > >
> > > Cheers,
> > > Chris
>
> "Python in a Nutshell" -- Absolutely!  Covers a lot in an easily
> accessible way.  The first book I reach for.  I hope Martelli updates it
> to 3.0.
>
> --
> -- Lou Pecora
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
http://www.goldwatches.com
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From nytrokiss at gmail.com  Sun May 17 05:51:55 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 17 May 2009 12:51:55 +0300
Subject: Generic web parser
In-Reply-To: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
References: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
Message-ID: <8a6b8e350905170251ja767e54w978ccb077626e282@mail.gmail.com>

I don't see the issue of using urllib and Sqllite for everything you mention
here.

On Sat, May 16, 2009 at 4:18 PM, S.Selvam <s.selvamsiva at gmail.com> wrote:

> Hi all,
>
> I have to design web parser which will visit the given list of websites and
> need to fetch a particular set of details.
> It has to be so generic that even if we add new websites, it must fetch
> those details if available anywhere.
> So it must be something like a framework.
>
> Though i have done some parsers ,but they will parse for a given
> format(For. eg It will get the data from <title> tag).But here each website
> may have different format and the information may available within any tags.
>
> I know its a tough task for me,but i feel with python it should be
> possible.
> My request is, if such thing is already available please let me know ,also
> your suggestions are welcome.
>
> Note: I planned to use BeautifulSoup for parsing.
>
> --
> Yours,
> S.Selvam
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
http://www.goldwatches.com
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From stef.mientki at gmail.com  Sun May 17 06:11:20 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 17 May 2009 12:11:20 +0200
Subject: os.path.split gets confused with combined \\ and /
Message-ID: <4A0FE2C8.6030600@gmail.com>

hello,

just wonder how others solve this problem:
I've to distribute both python files and data files.
Everything is developed under windows and now the datafiles contains 
paths with mixed \\ and /.
Under windows everthing is working well,
but under Ubuntu / Fedora sometimes strange errors occurs.
Now I was thinking that using os.path.split would solve all problems,
but if I've the following relative path

    path1/path2\\filename.dat

split will deliver the following under windows
   path = path1 / path2
   filename = filename.dat

while under Linux it will give me
   path = path1
   filename = path\\filename.dat

So I'm now planning to replace all occurences of os.path.split with a 
call to the following function

def path_split ( filename ) :
    # under Ubuntu a filename with both
    # forward and backward slashes seems to give trouble
    # already in os.path.split
    filename = filename.replace ( '\\','/')

    return os.path.split ( filename )

how do others solve this problem ?
Are there better ways to solve this problem ?

thanks,
Stef Mientki


From clp2 at rebertia.com  Sun May 17 06:15:59 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 17 May 2009 03:15:59 -0700
Subject: os.path.split gets confused with combined \\ and /
In-Reply-To: <4A0FE2C8.6030600@gmail.com>
References: <4A0FE2C8.6030600@gmail.com>
Message-ID: <50697b2c0905170315w4f2f6e6ax15728a614df32ec0@mail.gmail.com>

On Sun, May 17, 2009 at 3:11 AM, Stef Mientki <stef.mientki at gmail.com> wrote:
> hello,
>
> just wonder how others solve this problem:
> I've to distribute both python files and data files.
> Everything is developed under windows and now the datafiles contains paths
> with mixed \\ and /.
> Under windows everthing is working well,
> but under Ubuntu / Fedora sometimes strange errors occurs.
> Now I was thinking that using os.path.split would solve all problems,
> but if I've the following relative path
>
> ? path1/path2\\filename.dat
>
> split will deliver the following under windows
> ?path = path1 / path2
> ?filename = filename.dat
>
> while under Linux it will give me
> ?path = path1
> ?filename = path\\filename.dat
>
> So I'm now planning to replace all occurences of os.path.split with a call
> to the following function
>
> def path_split ( filename ) :
> ? # under Ubuntu a filename with both
> ? # forward and backward slashes seems to give trouble
> ? # already in os.path.split
> ? filename = filename.replace ( '\\','/')
>
> ? return os.path.split ( filename )
>
> how do others solve this problem ?
> Are there better ways to solve this problem ?

Just always use forward-slashes for paths in the first place since
they work on both platforms.
But your technique seems a reasonable way of dealing with mixed-up
datafiles, since you're in that situation.

Cheers,
Chris
-- 
http://blog.rebertia.com


From fthtmn at gmail.com  Sun May 17 06:18:07 2009
From: fthtmn at gmail.com (Fatih Tumen)
Date: Sun, 17 May 2009 13:18:07 +0300
Subject: python and samba
Message-ID: <67224dac0905170318h38912152y1d42625ebafc1be9@mail.gmail.com>

Hi,
I am working on a directory synchronisation tool for Linux.

$ gcc --version
gcc (GCC) 4.2.4 (Ubuntu 4.2.4-1ubuntu3)
$ python -V
Python 2.5.2
$ smbclient --version
Version 3.0.28a

I first designed it to work on the local filesystem. I am using filecmp.py
(distributed with Python) for comparing the files. Of course I had to
modify it in a way that it will return object rather than stdout. I have
this compare method in my main class which is os.walk()-ing through
the directories and labeling the files on the GUI according to this returned

object by filecmp.py.
Now I want add support for syncing between (unix and NT) network
shares without having to change my abstraction much. At first googling
I hit a samba discussion appeared on this list ages ago. It did not help me
much though. I also found this pysmbc, libsmbclient bindings, written by
Tim Waug but it requires libsmbclient-3.2.x. which requires
libc6 >= 2.8~20080505 which comes with Intreprid but I have reasons
not to upgrade my Hardy.
Another thing I found was pysamba, by Juan M. Casillas,  but it needs
a bit of hack; samba needs to be configured with python.
I am looking for something that won't bother the end user nor me. I want
to keep it as simple as possible. I will distribute the libraries myself if
I have
to and if licence is not an issue.

If I have to summarise, I need to get m_time and size (and preferably stick
with
os.walk and filecmp.py if possible) and copy files back and forth using
samba (unix <-> NT).  I don't wanna reinvent the wheel or overengineer
anything but if I can do this without any additional libraries, great!

I would appreciate any advice on this.
Thanks..
-- 
   Fatih
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From fthtmn at gmail.com  Sun May 17 06:18:34 2009
From: fthtmn at gmail.com (Fatih Tumen)
Date: Sun, 17 May 2009 13:18:34 +0300
Subject: filecmp.py licensing
Message-ID: <67224dac0905170318k433a345bp9fd9cd2ec50a17f3@mail.gmail.com>

Hi,
As I mentioned on the other thread about samba, I am working on a
synchronisation project and using filecmp.py for comparing files. I
modified it according to my needs and planning to distribute it with my
package. At first glance it seems that filecmp.py is a part of Python
package. Though I don't see a licence header on the file I assume that
it is licensed under PSFL. I will distribute my project with GNU GPL or
Creative Commons BY-NC-SA. My question is if I renamed it and
put the Python attribution on the header, would it be alright?

What is the proper way of doing this?
-- 
   Fatih
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From manu3d at gmail.com  Sun May 17 06:19:49 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Sun, 17 May 2009 03:19:49 -0700 (PDT)
Subject: Swapping superclass from a module
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>
Message-ID: <9a6bfcc1-4ab8-40bd-94f0-bd99a217797f@s20g2000vbp.googlegroups.com>

Wow, thank you all. Lots of ideas and things to try! I wish I knew
which one is going to work best. The module I'm trying to (monkey!)
patch is pxdom, and as it is a bit long (5700 lines of code.... in one
file!) I'm not quite sure if the simplest patching method will work or
the more complicated ones are necessary. Let me chew on it for a
little while. Luckilly pxdom has a test suite and I should be able to
find out quite quickly if a patch has broken something. Let me try and
chew on it, I'll report back.

Thank you all!

Manu


From clp2 at rebertia.com  Sun May 17 06:38:09 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 17 May 2009 03:38:09 -0700
Subject: Circular relationship: object - type
In-Reply-To: <89dd3da60905141534h339d361ao6171c164c3e7251b@mail.gmail.com>
References: <89dd3da60905141534h339d361ao6171c164c3e7251b@mail.gmail.com>
Message-ID: <50697b2c0905170338o4fd84406n214256662ccd18a9@mail.gmail.com>

On Thu, May 14, 2009 at 3:34 PM, Mohan Parthasarathy <suruti94 at gmail.com> wrote:
> Hi,
>
> I have read several articles and emails:
>
> http://www.cafepy.com/article/python_types_and_objects/python_types_and_objects.html#relationships-transitivity-figure
> http://mail.python.org/pipermail/python-list/2007-February/600128.html
>
>  I understand how type serves to be the default metaclass when an object is
> created and it also can be changed. I also read a few examples on why this
> metaclass can be a powerful concept. What I fail to understand is the
> circular relationship between object and type. Why does type have to be
> subclassed from object ? Just to make "Everything is an object and all
> objects are  inherited from object class".

Yes, essentially. It makes the system nice and axiomatic, so one
doesn't have to deal with special-cases when writing introspective
code.

Axiom 1. All classes ultimately subclass the class `object`.
Equivalently, `issubclass(X, object) and X.__mro__[-1] is object` are
true for any class `X`, and `isinstance(Y, object)` is true for all
objects `Y`.

Axiom 2. All (meta)classes are ultimately instances of the (meta)class `type`.
Equivalently, repeated application of type() to any object will
eventually result in `type`.

Any other formulation besides Python's current one would break these
handy axioms. The canonical object-oriented language, Smalltalk, had a
nearly identical setup with regard to its meta-objects.

Cheers,
Chris
-- 
http://blog.rebertia.com


From manu3d at gmail.com  Sun May 17 06:47:17 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Sun, 17 May 2009 03:47:17 -0700 (PDT)
Subject: Conceptual flaw in pxdom?
Message-ID: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>

Hi everybody,

I'm looking at pxdom and in particular at its foundation class
DOMObject (source code at the end of the message). In it, the author
attempts to allow the establishment of readonly and read&write
attributes through the special methods __getattr__ and __setattr__. In
so doing is possible to create subclasses such as:

class MyClass(DOMObject):

    def __init__(self):
        DOMObject.__init__(self)
        self._anAttribute = "im_a_readonly_attribute"

    ## The presence of the following method allows
    ## read-only access to the attribute without the
    ## underscore, i.e.: aVar = myClassInstance.anAttribute
    def _get_anAttribute(self): return self._anAttribute

   ## Uncommenting the following line allows the setting of
"anAttribute".
   ## Commented, the same action would raise an exception.
   ## def _set_anAttribute(self, value): self._anAttribute = value

This is all good and dandy and it works, mostly. However, if you look
at the code below for the method __getattr__, it appears to be
attempting to prevent direct access to -any- variable starting with an
underscore.

    def __getattr__(self, key):
        if key[:1]=='_':
            raise AttributeError, key

But access isn't actually prevented because __getattr__ is invoked -
only- if an attribute is not found by normal means. So, is it just me
or that little snipped of code either has another purpose or simply
doesn't do the intended job?

Manu

-----
class DOMObject:
    """Base class for objects implementing DOM interfaces

    Provide properties in a way compatible with old versions of
Python:
    subclass should provide method _get_propertyName to make a read-
only
    property, and also _set_propertyName for a writable. If the
readonly
    property is set, all other properties become immutable.
    """
    def __init__(self, readonly= False):
        self._readonly= readonly

    def _get_readonly(self):
        return self._readonly

    def _set_readonly(self, value):
        self._readonly= value

    def __getattr__(self, key):
        if key[:1]=='_':
            raise AttributeError, key
        try:
            getter= getattr(self, '_get_'+key)
        except AttributeError:
            raise AttributeError, key
        return getter()

    def __setattr__(self, key, value):
        if key[:1]=='_':
            self.__dict__[key]= value
            return

        # When an object is readonly, there are a few attributes that
can be set
        # regardless. Readonly is one (obviously), but due to a wart
in the DOM
        # spec it must also be possible to set nodeValue and
textContent to
        # anything on nodes where these properties are defined to be
null (with no
        # effect). Check specifically for these property names as a
nasty hack
        # to conform exactly to the spec.
        #
        if self._readonly and key not in ('readonly', 'nodeValue',
'textContent'):
            raise NoModificationAllowedErr(self, key)
        try:
            setter= getattr(self, '_set_'+key)
        except AttributeError:
            if hasattr(self, '_get_'+key):
                raise NoModificationAllowedErr(self, key)
            raise AttributeError, key
        setter(value)


From egrefen at gmail.com  Sun May 17 06:51:16 2009
From: egrefen at gmail.com (Edward Grefenstette)
Date: Sun, 17 May 2009 03:51:16 -0700 (PDT)
Subject: Help with Tkinter on OS X --- driving me insane!
Message-ID: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>

Any attempt to do anything with Tkinter (save import) raises the
following show-stopping error:

"Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/lib-tk/Tkinter.py", line 1645, in __init__
    self._loadtk()
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/lib-tk/Tkinter.py", line 1659, in _loadtk
    % (_tkinter.TK_VERSION, tk_version)
RuntimeError: tk.h version (8.4) doesn't match libtk.a version (8.5)"

As you can see, I'm running the vanilla install python on OS X 10.5.7.
Does anyone know how I can fix this? Google searches have yielded
results ranging from suggestions it has been fixed (not for me) to
recommendations that the user rebuild python against a newer version
of libtk (which I have no idea how to do).

I would greatly appreciate any assistance the community can provide on
the matter.

Best,
Edward


From beni.cherniavsky at gmail.com  Sun May 17 06:59:00 2009
From: beni.cherniavsky at gmail.com (Beni Cherniavsky)
Date: Sun, 17 May 2009 03:59:00 -0700 (PDT)
Subject: Best practice for operations on streams of text
References: <340d1511-8b2c-41bc-950d-3e25bdd433fb@j9g2000prh.googlegroups.com>
	<mailman.5247.1241730449.11746.python-list@python.org>
Message-ID: <4e17803b-18e5-48d0-a048-4abf5d53196e@r3g2000vbp.googlegroups.com>

On May 8, 12:07?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> def compound_filter(token_stream):
> ? ? ?stream = lowercase_token(token_stream)
> ? ? ?stream = remove_boring(stream)
> ? ? ?stream = remove_dupes(stream)
> ? ? ?for t in stream(t):
> ? ? ? ? ?yield t

The last loop is superfluous.  You can just do::

def compound_filter(token_stream):
     stream = lowercase_token(token_stream)
     stream = remove_boring(stream)
     stream = remove_dupes(stream)
     return stream

which is simpler and slightly more efficient.  This works because from
the caller's perspective, a generator is just a function that returns
an iterator.  It doesn't matter whether it implements the iterator
itself by containing ``yield`` statements, or shamelessly passes on an
iterator implemented elsewhere.


From nytrokiss at gmail.com  Sun May 17 08:03:27 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 17 May 2009 15:03:27 +0300
Subject: Fwd: [python-win32] Fwd: Autosizing column widths in Excel using 
	win32com.client ?
In-Reply-To: <4A0FE028.5030908@timgolden.me.uk>
References: <f03c4bd7-6250-496c-a58f-c6f09ba724f2@f16g2000vbf.googlegroups.com>
	<8a6b8e350905170244q2cce80fjed1e830871eae9ad@mail.gmail.com>
	<4A0FE028.5030908@timgolden.me.uk>
Message-ID: <8a6b8e350905170503i75ceac28lc18063d3d126aea9@mail.gmail.com>

---------- Forwarded message ----------
From: Tim Golden <mail at timgolden.me.uk>
Date: Sun, May 17, 2009 at 1:00 PM
Subject: Re: [python-win32] Fwd: Autosizing column widths in Excel using
win32com.client ?
To:
Cc: Python-Win32 List <python-win32 at python.org>


James Matthews wrote:

> ---------- Forwarded message ----------
> From: <nonsense at mynonsense.net>
> Date: Fri, May 15, 2009 at 7:45 PM
> Subject: Autosizing column widths in Excel using win32com.client ?
> To: python-list at python.org
>
>
> Is there a way to autosize the widths of the excel columns as when you
> double click them manually?
>

Usual answer to this kind of question: record a macro
in Excel to do what you want, and then use COM to
automate that. On my Excel 2007, this is the VBA result
of recording:

<vba>
Sub Macro2()
'
' Macro2 Macro
'
'
  Columns("A:A").Select
  Range(Selection, Selection.End(xlToRight)).Select
  Columns("A:D").EntireColumn.AutoFit
End Sub
</vba>


You then just fire up win32com.client or comtypes,
according to taste and go from there. If you need
help with the COM side of things, post back here.

TJG
_______________________________________________
python-win32 mailing list
python-win32 at python.org
http://mail.python.org/mailman/listinfo/python-win32



-- 
http://www.goldwatches.com
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From jeremy at martinfamily.freeserve.co.uk  Sun May 17 08:05:03 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Sun, 17 May 2009 05:05:03 -0700 (PDT)
Subject: Adding a Par construct to Python?
Message-ID: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>

>From a user point of view I think that adding a 'par' construct to
Python for parallel loops would add a lot of power and simplicity,
e.g.

par i in list:
    updatePartition(i)

There would be no locking and it would be the programmer's
responsibility to ensure that the loop was truly parallel and correct.

The intention of this would be to speed up Python execution on multi-
core platforms. Within a few years we will see 100+ core processors as
standard and we need to be ready for that.

There could also be parallel versions of map, filter and reduce
provided.

BUT...none of this would be possible with the current implementation
of Python with its Global Interpreter Lock, which effectively rules
out true parallel processing.

See: http://jessenoller.com/2009/02/01/python-threads-and-the-global-interpreter-lock/

What do others think?

Jeremy Martin


From jeremy at martinfamily.freeserve.co.uk  Sun May 17 08:37:37 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Sun, 17 May 2009 05:37:37 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
Message-ID: <c26b61e0-ee42-411b-a689-1f47e98f332a@r3g2000vbp.googlegroups.com>

On 17 May, 13:05, jer... at martinfamily.freeserve.co.uk wrote:
> From a user point of view I think that adding a 'par' construct to
> Python for parallel loops would add a lot of power and simplicity,
> e.g.
>
> par i in list:
> ? ? updatePartition(i)
>
...actually, thinking about this further, I think it would be good to
add a 'sync' keyword which causes a thread rendezvous within a
parallel loop. This would allow parallel loops to run for longer in
certain circumstances without having the overhead of stopping and
restarting all the threads, e.g.

par i in list:
    for j in iterations:
       updatePartion(i)
       sync
       commitBoundaryValues(i)
       sync

This example is a typical iteration over a grid, e.g. finite elements,
calculation, where the boundary values need to be read by neighbouring
partitions before they are updated. It assumes that the new values of
the boundary values are stored in temporary variables until they can
be safely updated.

Jeremy


From piet at cs.uu.nl  Sun May 17 08:42:39 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 17 May 2009 14:42:39 +0200
Subject: Help with Tkinter on OS X --- driving me insane!
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
Message-ID: <m2ab5buchs.fsf@cs.uu.nl>

>>>>> Edward Grefenstette <egrefen at gmail.com> (EG) wrote:

>EG> Any attempt to do anything with Tkinter (save import) raises the
>EG> following show-stopping error:

>EG> "Traceback (most recent call last):
>EG>   File "<stdin>", line 1, in <module>
>EG>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
>EG> python2.6/lib-tk/Tkinter.py", line 1645, in __init__
>EG>     self._loadtk()
>EG>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
>EG> python2.6/lib-tk/Tkinter.py", line 1659, in _loadtk
>EG>     % (_tkinter.TK_VERSION, tk_version)
>EG> RuntimeError: tk.h version (8.4) doesn't match libtk.a version (8.5)"

>EG> As you can see, I'm running the vanilla install python on OS X 10.5.7.
>EG> Does anyone know how I can fix this? Google searches have yielded
>EG> results ranging from suggestions it has been fixed (not for me) to
>EG> recommendations that the user rebuild python against a newer version
>EG> of libtk (which I have no idea how to do).

>EG> I would greatly appreciate any assistance the community can provide on
>EG> the matter.

Have you installed Tk version 8.5?

If so, remove it. You might also install the latest 8.4 version.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From DustanGroups at gmail.com  Sun May 17 10:02:19 2009
From: DustanGroups at gmail.com (Dustan)
Date: Sun, 17 May 2009 07:02:19 -0700 (PDT)
Subject: Photoimage on button appears pixelated when button is disabled
References: <fb96adf5-28cd-4493-8070-993f30f1d78e@v4g2000vba.googlegroups.com>
Message-ID: <a0be872b-ebff-4541-b22f-361409f56af4@l28g2000vba.googlegroups.com>

On May 15, 2:59?pm, Dustan <DustanGro... at gmail.com> wrote:
> In tkinter, when I place a photoimage on a button and disable the
> button, the image has background dots scattered through the image.
> Searching the web, I wasn't able to find any documentation on this
> behavior, nor how to turn it off. So here I am. How do I keep this
> from happening?
>
> Also, how can I extract the base-64 encoding of a GIF, so I can put
> the image directly into the code instead of having to keep a separate
> file for the image?
>
> All responses appreciated,
> Dustan

At the very least, someone ought to be able to provide an answer to
the second question.


From steve at REMOVE-THIS-cybersource.com.au  Sun May 17 10:07:33 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 17 May 2009 14:07:33 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
Message-ID: <02200d22$0$20645$c3e8da3@news.astraweb.com>

On Sun, 17 May 2009 05:05:03 -0700, jeremy wrote:

> From a user point of view I think that adding a 'par' construct to
> Python for parallel loops would add a lot of power and simplicity, e.g.
> 
> par i in list:
>     updatePartition(i)
> 
> There would be no locking and it would be the programmer's
> responsibility to ensure that the loop was truly parallel and correct.

What does 'par' actually do there?

Given that it is the programmer's responsibility to ensure that 
updatePartition was actually parallelized, couldn't that be written as:

for i in list:
    updatePartition(i)

and save a keyword?



-- 
Steven


From mail at timgolden.me.uk  Sun May 17 10:11:01 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Sun, 17 May 2009 15:11:01 +0100
Subject: Photoimage on button appears pixelated when button is disabled
In-Reply-To: <a0be872b-ebff-4541-b22f-361409f56af4@l28g2000vba.googlegroups.com>
References: <fb96adf5-28cd-4493-8070-993f30f1d78e@v4g2000vba.googlegroups.com>
	<a0be872b-ebff-4541-b22f-361409f56af4@l28g2000vba.googlegroups.com>
Message-ID: <4A101AF5.5030901@timgolden.me.uk>

Dustan wrote:
> On May 15, 2:59 pm, Dustan <DustanGro... at gmail.com> wrote:
>> In tkinter, when I place a photoimage on a button and disable the
>> button, the image has background dots scattered through the image.
>> Searching the web, I wasn't able to find any documentation on this
>> behavior, nor how to turn it off. So here I am. How do I keep this
>> from happening?
>>
>> Also, how can I extract the base-64 encoding of a GIF, so I can put
>> the image directly into the code instead of having to keep a separate
>> file for the image?
>>
>> All responses appreciated,
>> Dustan
> 
> At the very least, someone ought to be able to provide an answer to
> the second question.

Well I know nothing about Tkinter, but to do base64 encoding,
you want to look at the base64 module.

TJG


From beni.cherniavsky at gmail.com  Sun May 17 10:26:04 2009
From: beni.cherniavsky at gmail.com (Beni Cherniavsky)
Date: Sun, 17 May 2009 07:26:04 -0700 (PDT)
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz> 
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
	<pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <8dc983db-b8c4-4897-a58b-969ca5f8e14f@g20g2000vba.googlegroups.com>

[Long mail.  You may skip to the last paragraph to get the summary.]

On May 12, 12:35?pm, Steven D'Aprano wrote:
> To really be safe, that should become:
>
> try:
> ? ? rsrc = get(resource)
> except ResourceError:
> ? ? log('no more resources available')
> ? ? raise
> else:
> ? ? try:
> ? ? ? ? do_something_with(rsrc)
> ? ? finally:
> ? ? ? ? rsrc.close()
>
> which is now starting to get a bit icky (but only a bit, and only because
> of the nesting, not because of the else).
>
Note that this example doesn't need ``else``, because the ``except``
clause re-raises the exception.  It could as well be::

try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available')
    raise
try:
    do_something_with(rsrc)
finally:
    rsrc.close()

``else`` is relevant only if your ``except`` clause(s) may quietly
suppress the exception::

try:
    rsrc = get(resource)
except ResourceError:
    log('no more resources available, skipping do_something')
else:
    try:
        do_something_with(rsrc)
    finally:
        rsrc.close()

And yes, it's icky - not because of the ``else`` but because
aquisition-release done correctly is always an icky pattern.  That's
why we now have the ``with`` statement - assuming `get()` implements a
context manager, you should be able to write::

with get(resource) as rsrc:
    do_something_with(rsrc)

But wait, what if get() fails?  We get an exception!  We wanted to
suppress it::

try:
    with get(resource) as rsrc:
        do_something_with(rsrc)
except ResourceError:
    log('no more resources available, skipping do_something')

But wait, that catches ResourceError in ``do_something_with(rsrc)`` as
well!  Which is precisely what we tried to avoid by using
``try..else``!
Sadly, ``with`` doesn't have an else clause.  If somebody really
believes it should support this pattern, feel free to write a PEP.

I think this is a bad example of ``try..else``.  First, why would you
silently suppress out-of-resource exceptions?  If you don't suppress
them, you don't need ``else``.  Second, such runtime problems are
normally handled uniformely at some high level (log / abort / show a
message box / etc.), wherever they occur - if ``do_something_with(rsrc)
`` raises `ResourceError` you'd want it handled the same way.

So here is another, more practical example of ``try..else``:

try:
    bar = foo.get_bar()
except AttributeError:
    quux = foo.get_quux()
else:
    quux = bar.get_quux()

assuming ``foo.get_bar()`` is optional but ``bar.get_quux()`` isn't.
If we had put ``bar.get_quux()`` inside the ``try``, it could mask a
bug.  In fact to be precise, we don't want to catch an AttributeError
that may happen during the call to ``get_bar()``, so we should move
the call into the ``else``::

try:
    get_bar = foo.get_bar
except AttributeError:
    quux = foo.get_quux()
else:
    quux = get_bar().get_quux()

Ick!

The astute reader will notice that cases where it's important to
localize exception catching involves frequent excetions like
`AttributeError` or `IndexError` -- and that these cases are already
handled by `getattr` and `dict.get` (courtesy of Guido's Time
Machine).

Bottom line(s):
1. ``try..except..else`` is syntactically needed only when ``except``
might suppress the exception.
2. Minimal scope of ``try..except`` doesn't always apply (for
`AttirbuteError` it probably does, for `MemoryError` it probably
doesn't).
3. It *is* somewhat ackward to use, which is why the important use
cases - exceptions that are frequently raised and caught - deserve
wrapping by functions like `getattr()` with default arguments.


From grante at visi.com  Sun May 17 10:26:35 2009
From: grante at visi.com (Grant Edwards)
Date: Sun, 17 May 2009 09:26:35 -0500
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
Message-ID: <_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>

On 2009-05-17, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:
> On Sun, 17 May 2009 05:05:03 -0700, jeremy wrote:
>
>> From a user point of view I think that adding a 'par' construct to
>> Python for parallel loops would add a lot of power and simplicity, e.g.
>> 
>> par i in list:
>>     updatePartition(i)
>> 
>> There would be no locking and it would be the programmer's
>> responsibility to ensure that the loop was truly parallel and correct.
>
> What does 'par' actually do there?

My reading of the OP is that it tells the interpreter that it
can execute any/all iterations of updatePartion(i) in parallel
(or presumably serially in any order) rather than serially in a
strict sequence.

> Given that it is the programmer's responsibility to ensure
> that updatePartition was actually parallelized, couldn't that
> be written as:
>
> for i in list:
>     updatePartition(i)
>
> and save a keyword?

No, because a "for" loop is defined to execute it's iterations
serially in a specific order.  OTOH, a "par" loop is required
to execute once for each value, but those executions could
happen in parallel or in any order.

At least that's how I understood the OP.

-- 
Grant



From matusu at gmail.com  Sun May 17 10:39:38 2009
From: matusu at gmail.com (Matus)
Date: Sun, 17 May 2009 16:39:38 +0200
Subject: pushback iterator
Message-ID: <4A1021AA.7000000@gmail.com>

Hallo pylist,

I searches web and python documentation for implementation of pushback
iterator but found none in stdlib.

problem:
========
when you parse a file, often you have to read a line from parsed file
before you can decide if you want that line it or not. if not, it would
be a nice feature to be able po push the line back into the iterator, so
nest time when you pull from iterator you get this 'unused' line.

solution:
=========
I found a nice and fast solution somewhere on the net:

---------------------------------------------------------------------
class Pushback_wrapper( object ):
	def __init__( self, it ):
		self.it = it
		self.pushed_back = [ ]
		self.nextfn = it.next
	
	def __iter__( self ):
		return self
	
	def __nonzero__( self ):
		if self.pushed_back:
			return True
		
		try:
			self.pushback( self.nextfn( ) )
		except StopIteration:
			return False
		else:
			return True

	def popfn( self ):
		lst = self.pushed_back
		res = lst.pop( )
		if not lst:
			self.nextfn = self.it.next
		return res
		
	def next( self ):
		return self.nextfn( )

	def pushback( self, item ):
		self.pushed_back.append( item )
		self.nextfn = self.popfn
---------------------------------------------------------------------

proposal:
=========
as this is (as I suppose) common problem, would it be possible to extend
the stdlib of python (ie itertools module) with a similar solution so
one do not have to reinvent the wheel every time pushback is needed?


thx, Matus


From bearophileHUGS at lycos.com  Sun May 17 10:57:36 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sun, 17 May 2009 07:57:36 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
Message-ID: <e5f521ac-abba-4ea2-a441-147388855ac3@z7g2000vbh.googlegroups.com>

Jeremy Martin, nowadays a parallelfor can be useful, and in future
I'll try to introduce similar things in D too, but syntax isn't
enough. You need a way to run things in parallel. But Python has the
GIL.
To implement a good parallel for your language may also need more
immutable data structures (think about "finger trees"), and pure
functions can improve the safety of your code a lot, and so on.

The multiprocessing module Python2.6 already does something like what
you are talking about. For example I have used the parallel map of
that module to almost double the speed of a small program of mine.

Bye,
bearophile


From benjamin.kaplan at case.edu  Sun May 17 11:20:54 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sun, 17 May 2009 11:20:54 -0400
Subject: Help with Tkinter on OS X --- driving me insane!
In-Reply-To: <m2ab5buchs.fsf@cs.uu.nl>
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
Message-ID: <ec96e1390905170820l352286bia0e788d626b9b827@mail.gmail.com>

On Sun, May 17, 2009 at 8:42 AM, Piet van Oostrum <piet at cs.uu.nl> wrote:

> >>>>> Edward Grefenstette <egrefen at gmail.com> (EG) wrote:
>
> >EG> Any attempt to do anything with Tkinter (save import) raises the
> >EG> following show-stopping error:
>
> >EG> "Traceback (most recent call last):
> >EG>   File "<stdin>", line 1, in <module>
> >EG>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> >EG> python2.6/lib-tk/Tkinter.py", line 1645, in __init__
> >EG>     self._loadtk()
> >EG>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> >EG> python2.6/lib-tk/Tkinter.py", line 1659, in _loadtk
> >EG>     % (_tkinter.TK_VERSION, tk_version)
> >EG> RuntimeError: tk.h version (8.4) doesn't match libtk.a version (8.5)"
>
> >EG> As you can see, I'm running the vanilla install python on OS X 10.5.7.
> >EG> Does anyone know how I can fix this? Google searches have yielded
> >EG> results ranging from suggestions it has been fixed (not for me) to
> >EG> recommendations that the user rebuild python against a newer version
> >EG> of libtk (which I have no idea how to do).
>
> >EG> I would greatly appreciate any assistance the community can provide on
> >EG> the matter.
>
> Have you installed Tk version 8.5?
>
> If so, remove it. You might also install the latest 8.4 version.


There were a couple bugs in the 2.6.0 installer that stopped Tkinter from
working and this error message was given by one of them[1]. The python
installer looked in /System/Library before /Library/, so it used the System
Tk. The linker looks in /Library first so it found the user installed Tk and
used that instead. You then get a version mismatch. Try reinstalling Python
(use 2.6.2 if you're not already). That should get it to link with the
proper Tk.

[1] http://bugs.python.org/issue4017

--
> Piet van Oostrum <piet at cs.uu.nl>
> URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
> Private email: piet at vanoostrum.org
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From mk.fraggod at gmail.com  Sun May 17 11:22:22 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sun, 17 May 2009 21:22:22 +0600
Subject: pushback iterator
In-Reply-To: <4A1021AA.7000000@gmail.com>
References: <4A1021AA.7000000@gmail.com>
Message-ID: <20090517212222.059ee13c@coercion>

On Sun, 17 May 2009 16:39:38 +0200
Matus <matusu at gmail.com> wrote:

> I searches web and python documentation for implementation of pushback
> iterator but found none in stdlib.
> 
> problem:
> ========
> when you parse a file, often you have to read a line from parsed file
> before you can decide if you want that line it or not. if not, it would
> be a nice feature to be able po push the line back into the iterator, so
> nest time when you pull from iterator you get this 'unused' line.
>  
...
> 
> proposal:
> =========
> as this is (as I suppose) common problem, would it be possible to extend
> the stdlib of python (ie itertools module) with a similar solution so
> one do not have to reinvent the wheel every time pushback is needed?  

Sounds to me more like an iterator with a cache - you can't really pull
the line from a real iterable like generator function and then just push
it back.
If this "iterator" is really a list then you can use it as such w/o
unnecessary in-out operations.

And if you're "pushing back" the data for later use you might just as
well push it to dict with the right indexing, so the next "pop" won't
have to roam thru all the values again but instantly get the right one
from the cache, or just get on with that iterable until it depletes.

What real-world scenario am I missing here?

-- 
Mike Kazantsev // fraggod.net
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From steve at REMOVE-THIS-cybersource.com.au  Sun May 17 11:53:56 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 17 May 2009 15:53:56 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
Message-ID: <0220260f$0$20645$c3e8da3@news.astraweb.com>

On Sun, 17 May 2009 09:26:35 -0500, Grant Edwards wrote:

> On 2009-05-17, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au>
> wrote:
>> On Sun, 17 May 2009 05:05:03 -0700, jeremy wrote:
>>
>>> From a user point of view I think that adding a 'par' construct to
>>> Python for parallel loops would add a lot of power and simplicity,
>>> e.g.
>>> 
>>> par i in list:
>>>     updatePartition(i)
>>> 
>>> There would be no locking and it would be the programmer's
>>> responsibility to ensure that the loop was truly parallel and correct.
>>
>> What does 'par' actually do there?
> 
> My reading of the OP is that it tells the interpreter that it can
> execute any/all iterations of updatePartion(i) in parallel (or
> presumably serially in any order) rather than serially in a strict
> sequence.
> 
>> Given that it is the programmer's responsibility to ensure that
>> updatePartition was actually parallelized, couldn't that be written as:
>>
>> for i in list:
>>     updatePartition(i)
>>
>> and save a keyword?
> 
> No, because a "for" loop is defined to execute it's iterations serially
> in a specific order.  OTOH, a "par" loop is required to execute once for
> each value, but those executions could happen in parallel or in any
> order.
> 
> At least that's how I understood the OP.

I can try guessing what the OP is thinking just as well as anyone else, 
but "in the face of ambiguity, refuse the temptation to guess" :)

It isn't clear to me what the OP expects the "par" construct is supposed 
to actually do. Does it create a thread for each iteration? A process? 
Something else? Given that the rest of Python will be sequential (apart 
from explicitly parallelized functions), and that the OP specifies that 
updatePartition still needs to handle its own parallelization, does it 
really matter if the calls to updatePartition happen sequentially?

If it's important to make the calls in arbitrary order, random.shuffle 
will do that. If there's some other non-sequential and non-random order 
to the calls, the OP should explain what it is. What else, if anything, 
does par do, that it needs to be a keyword and statement rather than a 
function? What does it do that (say) a parallel version of map() wouldn't 
do?

The OP also suggested:

"There could also be parallel versions of map, filter and reduce
provided."

It makes sense to talk about parallelizing map(), because you can 
allocate a list of the right size to slot the results into as they become 
available. I'm not so sure about filter(), unless you give up the 
requirement that the filtered results occur in the same order as the 
originals.

But reduce()? I can't see how you can parallelize reduce(). By its 
nature, it has to run sequentially: it can't operate on the nth item 
until it is operated on the (n-1)th item.



-- 
Steven


From mk.fraggod at gmail.com  Sun May 17 12:15:52 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sun, 17 May 2009 22:15:52 +0600
Subject: pushback iterator
In-Reply-To: <4A103073.3090208@gmail.com>
References: <4A1021AA.7000000@gmail.com> <20090517212222.059ee13c@coercion>
	<4A103073.3090208@gmail.com>
Message-ID: <20090517221552.19946e30@coercion>

Somehow, I got the message off the list.

On Sun, 17 May 2009 17:42:43 +0200
Matus <matusu at gmail.com> wrote:

> > Sounds to me more like an iterator with a cache - you can't really pull
> > the line from a real iterable like generator function and then just push
> > it back.
> 
> true, that is why you have to implement this iterator wrapper

I fail to see much point of such a dumb cache, in most cases you
shouldn't iterate again and again thru the same sequence, so what's
good hardcoding (and thus, encouraging) such thing will do?

Besides, this wrapper breaks iteration order, since it's cache is LIFO
instead of FIFO, which should rather be implemented with deque instead
of list.

> > If this "iterator" is really a list then you can use it as such w/o
> > unnecessary in-out operations.
> 
> of course, it is not a list. you can wrap 'real' iterator using this
> wrapper (), and voila, you can use pushback method to 'push back' item
> received by next method. by calling next again, you will get pushed back
> item again, that is actually the point.

Wrapper differs from "list(iterator)" in only one thing: it might not
make it to the end of iterable, but if "pushing back" is common
operation, there's a good chance you'll make it to the end of the
iterator during execution, dragging whole thing along as a burden each
time.

> > And if you're "pushing back" the data for later use you might just as
> > well push it to dict with the right indexing, so the next "pop" won't
> > have to roam thru all the values again but instantly get the right one
> > from the cache, or just get on with that iterable until it depletes.
> > 
> > What real-world scenario am I missing here?
> > 
> 
> ok, I admit that that the file was not good example. better example
> would be just any iterator you use in your code.

Somehow I've always managed to avoid such re-iteration scenarios, but
of course, it could be just my luck ;)

-- 
Mike Kazantsev // fraggod.net
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From google at mrabarnett.plus.com  Sun May 17 12:19:15 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 17 May 2009 17:19:15 +0100
Subject: Adding a Par construct to Python?
In-Reply-To: <0220260f$0$20645$c3e8da3@news.astraweb.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<02200d22$0$20645$c3e8da3@news.astraweb.com>	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
Message-ID: <4A103903.5080302@mrabarnett.plus.com>

Steven D'Aprano wrote:
> On Sun, 17 May 2009 09:26:35 -0500, Grant Edwards wrote:
> 
>> On 2009-05-17, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au>
>> wrote:
>>> On Sun, 17 May 2009 05:05:03 -0700, jeremy wrote:
>>>
>>>> From a user point of view I think that adding a 'par' construct to
>>>> Python for parallel loops would add a lot of power and simplicity,
>>>> e.g.
>>>>
>>>> par i in list:
>>>>     updatePartition(i)
>>>>
>>>> There would be no locking and it would be the programmer's
>>>> responsibility to ensure that the loop was truly parallel and correct.
>>> What does 'par' actually do there?
>> My reading of the OP is that it tells the interpreter that it can
>> execute any/all iterations of updatePartion(i) in parallel (or
>> presumably serially in any order) rather than serially in a strict
>> sequence.
>>
>>> Given that it is the programmer's responsibility to ensure that
>>> updatePartition was actually parallelized, couldn't that be written as:
>>>
>>> for i in list:
>>>     updatePartition(i)
>>>
>>> and save a keyword?
>> No, because a "for" loop is defined to execute it's iterations serially
>> in a specific order.  OTOH, a "par" loop is required to execute once for
>> each value, but those executions could happen in parallel or in any
>> order.
>>
>> At least that's how I understood the OP.
> 
> I can try guessing what the OP is thinking just as well as anyone else, 
> but "in the face of ambiguity, refuse the temptation to guess" :)
> 
> It isn't clear to me what the OP expects the "par" construct is supposed 
> to actually do. Does it create a thread for each iteration? A process? 
> Something else? Given that the rest of Python will be sequential (apart 
> from explicitly parallelized functions), and that the OP specifies that 
> updatePartition still needs to handle its own parallelization, does it 
> really matter if the calls to updatePartition happen sequentially?
> 
> If it's important to make the calls in arbitrary order, random.shuffle 
> will do that. If there's some other non-sequential and non-random order 
> to the calls, the OP should explain what it is. What else, if anything, 
> does par do, that it needs to be a keyword and statement rather than a 
> function? What does it do that (say) a parallel version of map() wouldn't 
> do?
> 
> The OP also suggested:
> 
> "There could also be parallel versions of map, filter and reduce
> provided."
> 
> It makes sense to talk about parallelizing map(), because you can 
> allocate a list of the right size to slot the results into as they become 
> available. I'm not so sure about filter(), unless you give up the 
> requirement that the filtered results occur in the same order as the 
> originals.
> 
> But reduce()? I can't see how you can parallelize reduce(). By its 
> nature, it has to run sequentially: it can't operate on the nth item 
> until it is operated on the (n-1)th item.
> 
It can calculate the items in parallel, but the final result must be
calculated sequence, although if the final operation is commutative then
some of them could be done in parallel.


From deets at nospam.web.de  Sun May 17 12:24:34 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 17 May 2009 18:24:34 +0200
Subject: Adding a Par construct to Python?
In-Reply-To: <0220260f$0$20645$c3e8da3@news.astraweb.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<02200d22$0$20645$c3e8da3@news.astraweb.com>	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
Message-ID: <77as23F1fhj3uU1@mid.uni-berlin.de>

> But reduce()? I can't see how you can parallelize reduce(). By its 
> nature, it has to run sequentially: it can't operate on the nth item 
> until it is operated on the (n-1)th item.

That depends on the operation in question. Addition for example would 
work. My math-skills are a bit too rusty to qualify the exact nature of 
the operation, commutativity springs to my mind.

Diez


From kyrie at uh.cu  Sun May 17 12:47:35 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Sun, 17 May 2009 12:47:35 -0400
Subject: pushback iterator
In-Reply-To: <20090517212222.059ee13c@coercion>
References: <4A1021AA.7000000@gmail.com> <20090517212222.059ee13c@coercion>
Message-ID: <1242578855.4a103fa7979ed@mail.uh.cu>


Quoting Mike Kazantsev <mk.fraggod at gmail.com>:

> And if you're "pushing back" the data for later use you might just as
> well push it to dict with the right indexing, so the next "pop" won't
> have to roam thru all the values again but instantly get the right one
> from the cache, or just get on with that iterable until it depletes.
> 
> What real-world scenario am I missing here?

Other than one he described in his message? Neither of your proposed solutions
solves the OP's problem. He doesn't have a list (he /could/ build a list, and
thus defeat the purpose of having an iterator). He /could/ use alternative data
structures, like the dictionary you are suggesting... and he is, he is using his
pushback iterator, but he has to include it over and over.

Currently there is no good "pythonic" way of building a functions that decide to
stop consuming from an iterator when the first invalid input is encountered:
that last, invalid input is lost from the iterator. You can't just abstract the
whole logic inside the function, "something" must leak.

Consider, for instance, the itertools.dropwhile (and takewhile). You can't just
use it like

i = iter(something)
itertools.dropwhile(condition, i)
# now consume the rest

Instead, you have to do this:

i = iter(something)
i = itertools.dropwhile(condition, i) 
# and now i contains _another_ iterator
# and the first one still exists[*], but shouldn't be used
# [*] (assume it was a parameter instead of the iter construct)

For parsing files, for instance (similar to the OP's example), it could be nice
to do:

f = file(something)
lines = iter(f)
parse_headers(lines)
parse_body(lines)
parse_footer(lines)

which is currently impossible.

To the OP: if you don't mind doing instead:

f = file(something)
rest = parse_headers(f)
rest = parse_body(rest)
rest = parse_footer(rest)

you could return itertools.chain([pushed_back], iterator) from your parsing
functions. Unfortunately, this way will add another layer of itertools.chain on
top of the iterator, you will have to hope this will not cause a
performace/memory penalty.

Cheers,

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie

-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From roy at panix.com  Sun May 17 12:53:02 2009
From: roy at panix.com (Roy Smith)
Date: Sun, 17 May 2009 12:53:02 -0400
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
Message-ID: <roy-30A326.12530217052009@news.panix.com>

In article <0220260f$0$20645$c3e8da3 at news.astraweb.com>,
 Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:

> But reduce()? I can't see how you can parallelize reduce(). By its 
> nature, it has to run sequentially: it can't operate on the nth item 
> until it is operated on the (n-1)th item.

Well, if you're willing to impose the additional constraint that f() must 
be associative, then you could load the items into a tree, and work your 
way up from the bottom of the tree, applying f() pairwise to the left and 
right child of each node, propagating upward.

It would take k1 * O(n) to create the (unsorted) tree, and if all the pairs 
in each layer really could be done in parallel, k2 * O(lg n) to propagate 
the intermediate values.  As long as k2 is large compared to k1, you win.

Of course, if the items are already in some random-access container (such 
as a list), you don't even need to do the first step, but in the general 
case of generating the elements on the fly with an iterable, you do.  Even 
with an iterable, you could start processing the first elements while 
you're still generating the rest of them, but that gets a lot more 
complicated and assuming k2 >> k1, of limited value.

If k2 is about the same as k1, then the whole thing is pointless.

But, this would be something to put in a library function, or maybe a 
special-purpose Python derivative, such as numpy.  Not in the core language.


From gherron at islandtraining.com  Sun May 17 13:56:18 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Sun, 17 May 2009 10:56:18 -0700
Subject: Adding a Par construct to Python?
In-Reply-To: <4A103903.5080302@mrabarnett.plus.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<02200d22$0$20645$c3e8da3@news.astraweb.com>	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<4A103903.5080302@mrabarnett.plus.com>
Message-ID: <4A104FC2.7020801@islandtraining.com>

MRAB wrote:
> Steven D'Aprano wrote:
>> On Sun, 17 May 2009 09:26:35 -0500, Grant Edwards wrote:
>>
>>> On 2009-05-17, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au>
>>> wrote:
>>>> On Sun, 17 May 2009 05:05:03 -0700, jeremy wrote:
>>>>
>>>>> From a user point of view I think that adding a 'par' construct to
>>>>> Python for parallel loops would add a lot of power and simplicity,
>>>>> e.g.
>>>>>
>>>>> par i in list:
>>>>>     updatePartition(i)
>>>>>
>>>>> There would be no locking and it would be the programmer's
>>>>> responsibility to ensure that the loop was truly parallel and 
>>>>> correct.
>>>> What does 'par' actually do there?
>>> My reading of the OP is that it tells the interpreter that it can
>>> execute any/all iterations of updatePartion(i) in parallel (or
>>> presumably serially in any order) rather than serially in a strict
>>> sequence.
>>>
>>>> Given that it is the programmer's responsibility to ensure that
>>>> updatePartition was actually parallelized, couldn't that be written 
>>>> as:
>>>>
>>>> for i in list:
>>>>     updatePartition(i)
>>>>
>>>> and save a keyword?
>>> No, because a "for" loop is defined to execute it's iterations serially
>>> in a specific order.  OTOH, a "par" loop is required to execute once 
>>> for
>>> each value, but those executions could happen in parallel or in any
>>> order.
>>>
>>> At least that's how I understood the OP.
>>
>> I can try guessing what the OP is thinking just as well as anyone 
>> else, but "in the face of ambiguity, refuse the temptation to guess" :)
>>
>> It isn't clear to me what the OP expects the "par" construct is 
>> supposed to actually do. Does it create a thread for each iteration? 
>> A process? Something else? Given that the rest of Python will be 
>> sequential (apart from explicitly parallelized functions), and that 
>> the OP specifies that updatePartition still needs to handle its own 
>> parallelization, does it really matter if the calls to 
>> updatePartition happen sequentially?
>>
>> If it's important to make the calls in arbitrary order, 
>> random.shuffle will do that. If there's some other non-sequential and 
>> non-random order to the calls, the OP should explain what it is. What 
>> else, if anything, does par do, that it needs to be a keyword and 
>> statement rather than a function? What does it do that (say) a 
>> parallel version of map() wouldn't do?
>>
>> The OP also suggested:
>>
>> "There could also be parallel versions of map, filter and reduce
>> provided."
>>
>> It makes sense to talk about parallelizing map(), because you can 
>> allocate a list of the right size to slot the results into as they 
>> become available. I'm not so sure about filter(), unless you give up 
>> the requirement that the filtered results occur in the same order as 
>> the originals.
>>
>> But reduce()? I can't see how you can parallelize reduce(). By its 
>> nature, it has to run sequentially: it can't operate on the nth item 
>> until it is operated on the (n-1)th item.
>>
> It can calculate the items in parallel, but the final result must be
> calculated sequence, although if the final operation is commutative then
> some of them could be done in parallel.

That should read "associative" not "commutative".

For instance A+B+C+D could be calculated sequentially as implied by
  ((A+B)+C)+D
or with some parallelism as implied by
  (A+B)+(C+D)
That's an application of the associativity of addition.

Gary Herron




From steve at REMOVE-THIS-cybersource.com.au  Sun May 17 14:11:57 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 17 May 2009 18:11:57 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de>
Message-ID: <02204669$0$25303$c3e8da3@news.astraweb.com>

On Sun, 17 May 2009 18:24:34 +0200, Diez B. Roggisch wrote:

>> But reduce()? I can't see how you can parallelize reduce(). By its
>> nature, it has to run sequentially: it can't operate on the nth item
>> until it is operated on the (n-1)th item.
> 
> That depends on the operation in question. Addition for example would
> work. 

You'd think so, but you'd be wrong. You can't assume addition is always 
commutative.

>>> reduce(operator.add, (1.0, 1e57, -1e57))
0.0
>>> reduce(operator.add, (1e57, -1e57, 1.0))
1.0



> My math-skills are a bit too rusty to qualify the exact nature of
> the operation, commutativity springs to my mind.

And how is reduce() supposed to know whether or not some arbitrary 
function is commutative?


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun May 17 14:16:07 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 17 May 2009 18:16:07 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<mailman.290.1242577147.8015.python-list@python.org>
Message-ID: <02204763$0$25303$c3e8da3@news.astraweb.com>

On Sun, 17 May 2009 17:19:15 +0100, MRAB wrote:

>> But reduce()? I can't see how you can parallelize reduce(). By its
>> nature, it has to run sequentially: it can't operate on the nth item
>> until it is operated on the (n-1)th item.
>> 
> It can calculate the items in parallel, 

I don't understand what calculation you are talking about. Let's take a 
simple example:

reduce(operator.sub, [100, 50, 25, 5])  => 100-50-25-5 = 20

What calculations do you expect to do in parallel?


> but the final result must be
> calculated sequence, although if the final operation is commutative then
> some of them could be done in parallel.

But reduce() can't tell whether the function being applied is commutative 
or not. I suppose it could special-case a handful of special cases (e.g. 
operator.add for int arguments -- but not floats!) or take a caller-
supplied argument that tells it whether the function is commutative or 
not. But in general, you can't assume the function being applied is 
commutative or associative, so unless you're willing to accept undefined 
behaviour, I don't see any practical way of parallelizing reduce().


-- 
Steven


From deets at nospam.web.de  Sun May 17 14:34:00 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 17 May 2009 20:34:00 +0200
Subject: Adding a Par construct to Python?
In-Reply-To: <02204669$0$25303$c3e8da3@news.astraweb.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<02200d22$0$20645$c3e8da3@news.astraweb.com>	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>	<0220260f$0$20645$c3e8da3@news.astraweb.com>	<77as23F1fhj3uU1@mid.uni-berlin.de>
	<02204669$0$25303$c3e8da3@news.astraweb.com>
Message-ID: <77b3koF1go3t7U1@mid.uni-berlin.de>

> 
>> My math-skills are a bit too rusty to qualify the exact nature of
>> the operation, commutativity springs to my mind.
> 
> And how is reduce() supposed to know whether or not some arbitrary 
> function is commutative?

I don't recall anybody saying it should know that - do you? The OP wants 
to introduce parallel variants, not replace the existing ones.

Diez


From google at mrabarnett.plus.com  Sun May 17 14:35:01 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 17 May 2009 19:35:01 +0100
Subject: Adding a Par construct to Python?
In-Reply-To: <02204763$0$25303$c3e8da3@news.astraweb.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<02200d22$0$20645$c3e8da3@news.astraweb.com>	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>	<0220260f$0$20645$c3e8da3@news.astraweb.com>	<mailman.290.1242577147.8015.python-list@python.org>
	<02204763$0$25303$c3e8da3@news.astraweb.com>
Message-ID: <4A1058D5.7090109@mrabarnett.plus.com>

Steven D'Aprano wrote:
> On Sun, 17 May 2009 17:19:15 +0100, MRAB wrote:
> 
>>> But reduce()? I can't see how you can parallelize reduce(). By its
>>> nature, it has to run sequentially: it can't operate on the nth item
>>> until it is operated on the (n-1)th item.
>>>
>> It can calculate the items in parallel, 
> 
> I don't understand what calculation you are talking about. Let's take a 
> simple example:
> 
> reduce(operator.sub, [100, 50, 25, 5])  => 100-50-25-5 = 20
> 
> What calculations do you expect to do in parallel?
> 
> 
>> but the final result must be
>> calculated sequence, although if the final operation is commutative then
>> some of them could be done in parallel.
> 
> But reduce() can't tell whether the function being applied is commutative 
> or not. I suppose it could special-case a handful of special cases (e.g. 
> operator.add for int arguments -- but not floats!) or take a caller-
> supplied argument that tells it whether the function is commutative or 
> not. But in general, you can't assume the function being applied is 
> commutative or associative, so unless you're willing to accept undefined 
> behaviour, I don't see any practical way of parallelizing reduce().
> 
I meant associative not commutative.

I was thinking about calculating the sum of a list of expressions, where
the expressions could be calculated in parallel.


From deets at nospam.web.de  Sun May 17 14:36:36 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 17 May 2009 20:36:36 +0200
Subject: Adding a Par construct to Python?
In-Reply-To: <02204763$0$25303$c3e8da3@news.astraweb.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<02200d22$0$20645$c3e8da3@news.astraweb.com>	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>	<0220260f$0$20645$c3e8da3@news.astraweb.com>	<mailman.290.1242577147.8015.python-list@python.org>
	<02204763$0$25303$c3e8da3@news.astraweb.com>
Message-ID: <77b3pkF1go3t7U2@mid.uni-berlin.de>

> But reduce() can't tell whether the function being applied is commutative 
> or not. I suppose it could special-case a handful of special cases (e.g. 
> operator.add for int arguments -- but not floats!) or take a caller-
> supplied argument that tells it whether the function is commutative or 
> not. But in general, you can't assume the function being applied is 
> commutative or associative, so unless you're willing to accept undefined 
> behaviour, I don't see any practical way of parallelizing reduce().

def reduce(operation, sequence, startitem=None, parallelize=False)

should be enough. Approaches such as OpenMP also don't guess, they use 
explicit annotations.

Diez


From anuhacks at gmail.com  Sun May 17 15:13:31 2009
From: anuhacks at gmail.com (anusha k)
Date: Mon, 18 May 2009 00:43:31 +0530
Subject: threading issue
Message-ID: <61f9a5fb0905171213x84e8223haf84b5f58d835c61@mail.gmail.com>

hi,

i am using pygtk,glade in the front end and postgresql,python-twisted
(xmlrpc) as the back end.My issue is i am trying to add the progress bar in
my application but when the progress bar comes up it is blocking the backend
process.So i started using threading in my application.But when i added that
it is working but i am not able to destroy the window where the progress bar
is present, which is part of main window.
********************************************************************************************************
my code is
class ledger(threading.Thread):
    """This class sets the fraction of the progressbar"""

    #Thread event, stops the thread if it is set.
    stopthread = threading.Event()
 ......
    wTree = gtk.glade.XML('gnukhata/main_window.glade','window_progressbar')
    window = wTree.get_widget('window_progressbar')
    window.set_size_request(300,50)
    progressbar = wTree.get_widget('progressbar')
    #window.connect('destroy',self.main_quit)
    window.show_all()



    def run(self):
        """Run method, this is the code that runs while thread is alive."""

        #Importing the progressbar widget from the global scope
        #global progressbar
        course = True
        #While the stopthread event isn't setted, the thread keeps going on
        while course :
            # Acquiring the gtk global mutex
            gtk.gdk.threads_enter()
            #Setting a random value for the fraction
            l=0.1
            while l<1:
                self.progressbar.pulse()
                time.sleep(0.1)
                l=l+0.1


            queryParams = []
            res1=self.x.account.getAllAccountNamesByLedger(queryParams)
            for l in range(0,len(res1)):
               ;;;;;;;;;;;;;;;;;;
            # Releasing the gtk global mutex
            gtk.gdk.threads_leave()

            #Delaying 100ms until the next iteration
            time.sleep(0.1)
            course = False
        #gtk.main_quit()
        global fs
        print 'anu'
        #Stopping the thread and the gtk's main loop
        fs.stop()

        #window.destroy()

        self.ods.save("Ledger.ods")
        os.system("ooffice Ledger.ods")


    def stop(self):
        """Stop method, sets the event to terminate the thread's main
loop"""
        self.stopthread.set()

*********************************************************************************************************



njoy the share of freedom,
Anusha Kadambala
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From steve.ferg.bitbucket at gmail.com  Sun May 17 15:44:31 2009
From: steve.ferg.bitbucket at gmail.com (Steve Ferg)
Date: Sun, 17 May 2009 12:44:31 -0700 (PDT)
Subject: Seeking old post on developers who like IDEs vs developers who like 
	simple languages
Message-ID: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>

A few years ago someone, somewhere on the Web, posted a blog in which
he observed that developers, by general temperament, seem to fall into
two groups.

On the one hand, there are developers who love big IDEs with lots of
features (code generation, error checking, etc.), and rely on them to
provide the high level of support needed to be reasonably productive
in heavy-weight languages (e.g. Java).

On the other hand there are developers who much prefer to keep things
light-weight and simple.  They like clean high-level languages (e.g.
Python) which are compact enough that you can keep the whole language
in your head, and require only a good text editor to be used
effectively.

The author wasn't saying that one was better than the other: only that
there seemed to be this recognizable difference in preferences.

I periodically think of that blog, usually in circumstances that make
me also think "Boy, that guy really got it right".  But despite
repeated and prolonged bouts of googling I haven't been able to find
the article again.  I must be using the wrong search terms or
something.

Does anybody have a link to this article?

Thanks VERY MUCH in advance,
-- Steve Ferg


From matusu at gmail.com  Sun May 17 16:17:17 2009
From: matusu at gmail.com (Matus)
Date: Sun, 17 May 2009 22:17:17 +0200
Subject: pushback iterator
In-Reply-To: <1242578855.4a103fa7979ed@mail.uh.cu>
References: <4A1021AA.7000000@gmail.com> <20090517212222.059ee13c@coercion>
	<1242578855.4a103fa7979ed@mail.uh.cu>
Message-ID: <4A1070CD.5030403@gmail.com>



Luis Alberto Zarrabeitia Gomez wrote:
> Quoting Mike Kazantsev <mk.fraggod at gmail.com>:
> 
>> And if you're "pushing back" the data for later use you might just as
>> well push it to dict with the right indexing, so the next "pop" won't
>> have to roam thru all the values again but instantly get the right one
>> from the cache, or just get on with that iterable until it depletes.
>>
>> What real-world scenario am I missing here?
> 
> Other than one he described in his message? Neither of your proposed solutions
> solves the OP's problem. He doesn't have a list (he /could/ build a list, and
> thus defeat the purpose of having an iterator). He /could/ use alternative data
> structures, like the dictionary you are suggesting... and he is, he is using his
> pushback iterator, but he has to include it over and over.
> 
> Currently there is no good "pythonic" way of building a functions that decide to
> stop consuming from an iterator when the first invalid input is encountered:
> that last, invalid input is lost from the iterator. You can't just abstract the
> whole logic inside the function, "something" must leak.
> 
> Consider, for instance, the itertools.dropwhile (and takewhile). You can't just
> use it like
> 
> i = iter(something)
> itertools.dropwhile(condition, i)
> # now consume the rest
> 
> Instead, you have to do this:
> 
> i = iter(something)
> i = itertools.dropwhile(condition, i) 
> # and now i contains _another_ iterator
> # and the first one still exists[*], but shouldn't be used
> # [*] (assume it was a parameter instead of the iter construct)
> 
> For parsing files, for instance (similar to the OP's example), it could be nice
> to do:
> 
> f = file(something)
> lines = iter(f)
> parse_headers(lines)
> parse_body(lines)
> parse_footer(lines)
> 

that is basically one of many possible scenarios I was referring to.
other example would be:

----------------------------------------------------
iter = Pushback_wrapper( open( 'my.file' ).readlines( ) )
for line in iter:
	if is_outer_scope( line ):
		'''
		do some processing for this logical scope of file. there is only fet
outer scope lines
		'''
		continue
	
	for line in iter:
		'''
		here we expect 1000 - 2000 lines of inner scope and we do not want to
run is_outer_scope()
		for every line as it is expensive, so we decided to reiterate
		'''
		if is_inner_scope( line ):
			'''
			do some processing for this logical scope of file untill outer scope
condition occurs
			'''
		elif is_outer_scope( line ):
			iter.pushback( line )
			break
		else:
			'''flush line'''
----------------------------------------------------

> which is currently impossible.
> 
> To the OP: if you don't mind doing instead:
> 
> f = file(something)
> rest = parse_headers(f)
> rest = parse_body(rest)
> rest = parse_footer(rest)
> 
> you could return itertools.chain([pushed_back], iterator) from your parsing
> functions. Unfortunately, this way will add another layer of itertools.chain on
> top of the iterator, you will have to hope this will not cause a
> performace/memory penalty.
> 
> Cheers,
> 


From tjreedy at udel.edu  Sun May 17 16:18:52 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 17 May 2009 16:18:52 -0400
Subject: Swapping superclass from a module
In-Reply-To: <guoe2u$ra8$02$1@news.t-online.com>
References: <c4858964-8ebc-4112-b8db-33953f4d3776@l28g2000vba.googlegroups.com>	<021f5d69$0$20645$c3e8da3@news.astraweb.com>	<mailman.272.1242540495.8015.python-list@python.org>
	<guoe2u$ra8$02$1@news.t-online.com>
Message-ID: <guprfa$1q8$1@ger.gmane.org>

Peter Otten wrote:
> Terry Reedy wrote:
> 

>> If the names of superclasses is resolved when classes are instantiated,
>> the patching is easy.  If, as I would suspect, the names are resolved
>> when the classes are created, before the module becomes available to the
>> importing code, then much more careful and extensive patching would be
>> required, if it is even possible.  (Objects in tuples cannot be
>> replaced, and some attributes are not writable.)
> 
> It may be sufficient to patch the subclasses:

I was not sure if __bases__ is writable or not.  There is also __mro__ 
to consider.

> $ cat my_file.py
> class Super(object):
>     def __str__(self):
>         return "old"
> 
> class Sub(Super):
>     def __str__(self):
>         return "Sub(%s)" % super(Sub, self).__str__()
> 
> class Other(object):
>     pass
> 
> class SubSub(Sub, Other):
>     def __str__(self):
>         return "SubSub(%s)" % super(SubSub, self).__str__()
> 
> if __name__ == "__main__":
>     print Sub()
> 
> $ cat main2.py
> import my_file
> OldSuper = my_file.Super
> 
> class NewSuper(OldSuper):
>     def __str__(self):
>         return "new" + super(NewSuper, self).__str__()
> 
> my_file.Super = NewSuper
> for n, v in vars(my_file).iteritems():
>     if v is not NewSuper:
>         try:
>             bases = v.__bases__
>         except AttributeError:
>             pass
>         else:
>             if OldSuper in bases:
>                 print "patching", n
>                 v.__bases__ = tuple(NewSuper if b is OldSuper else b
>                                     for b in bases)
> 
> 
> print my_file.Sub()
> print my_file.SubSub()
> $ python main2.py
> patching Sub
> Sub(newold)
> SubSub(Sub(newold))
> 
> Peter
> 



From martin at v.loewis.de  Sun May 17 16:54:32 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 17 May 2009 22:54:32 +0200
Subject: PEP 384: Defining a Stable ABI
Message-ID: <4A107988.3020202@v.loewis.de>

Thomas Wouters reminded me of a long-standing idea; I finally
found the time to write it down.

Please comment!

Regards,
Martin

PEP: 384
Title: Defining a Stable ABI
Version: $Revision: 72754 $
Last-Modified: $Date: 2009-05-17 21:14:52 +0200 (So, 17. Mai 2009) $
Author: Martin v. L?wis <martin at v.loewis.de>
Status: Draft
Type: Standards Track
Content-Type: text/x-rst
Created: 17-May-2009
Python-Version: 3.2
Post-History:

Abstract
========

Currently, each feature release introduces a new name for the
Python DLL on Windows, and may cause incompatibilities for extension
modules on Unix. This PEP proposes to define a stable set of API
functions which are guaranteed to be available for the lifetime
of Python 3, and which will also remain binary-compatible across
versions. Extension modules and applications embedding Python
can work with different feature releases as long as they restrict
themselves to this stable ABI.

Rationale
=========

The primary source of ABI incompatibility are changes to the lay-out
of in-memory structures. For example, the way in which string interning
works, or the data type used to represent the size of an object, have
changed during the life of Python 2.x. As a consequence, extension
modules making direct access to fields of strings, lists, or tuples,
would break if their code is loaded into a newer version of the
interpreter without recompilation: offsets of other fields may have
changed, making the extension modules access the wrong data.

In some cases, the incompatibilities only affect internal objects of
the interpreter, such as frame or code objects. For example, the way
line numbers are represented has changed in the 2.x lifetime, as has
the way in which local variables are stored (due to the introduction
of closures). Even though most applications probably never used these
objects, changing them had required to change the PYTHON_API_VERSION.

On Linux, changes to the ABI are often not much of a problem: the
system will provide a default Python installation, and many extension
modules are already provided pre-compiled for that version. If additional
modules are needed, or additional Python versions, users can typically
compile them themselves on the system, resulting in modules that use
the right ABI.

On Windows, multiple simultaneous installations of different Python
versions are common, and extension modules are compiled by their
authors, not by end users. To reduce the risk of ABI incompatibilities,
Python currently introduces a new DLL name pythonXY.dll for each
feature release, whether or not ABI incompatibilities actually exist.

With this PEP, it will be possible to reduce the dependency of binary
extension modules on a specific Python feature release, and applications
embedding Python can be made work with different releases.

Specification
=============

The ABI specification falls into two parts: an API specification,
specifying what function (groups) are available for use with the
ABI, and a linkage specification specifying what libraries to link
with. The actual ABI (layout of structures in memory, function
calling conventions) is not specified, but implied by the
compiler. As a recommendation, a specific ABI is recommended for
selected platforms.

During evolution of Python, new ABI functions will be added.
Applications using them will then have a requirement on a minimum
version of Python; this PEP provides no mechanism for such
applications to fall back when the Python library is too old.

Terminology
-----------

Applications and extension modules that want to use this ABI
are collectively referred to as "applications" from here on.

Header Files and Preprocessor Definitions
-----------------------------------------

Applications shall only include the header file Python.h (before
including any system headers), or, optionally, include pyconfig.h, and
then Python.h.

During the compilation of applications, the preprocessor macro
Py_LIMITED_API must be defined. Doing so will hide all definitions
that are not part of the ABI.

Structures
----------

Only the following structures and structure fields are accessible to
applications:

- PyObject (ob_refcnt, ob_type)
- PyVarObject (ob_base, ob_size)
- Py_buffer (buf, obj, len, itemsize, readonly, ndim, shape,
  strides, suboffsets, smalltable, internal)
- PyMethodDef (ml_name, ml_meth, ml_flags, ml_doc)
- PyMemberDef (name, type, offset, flags, doc)
- PyGetSetDef (name, get, set, doc, closure)

The accessor macros to these fields (Py_REFCNT, Py_TYPE, Py_SIZE)
are also available to applications.

The following types are available, but opaque (i.e. incomplete):

- PyThreadState
- PyInterpreterState

Type Objects
------------

The structure of type objects is not available to applications;
declaration of "static" type objects is not possible anymore
(for applications using this ABI).
Instead, type objects get created dynamically. To allow an
easy creation of types (in particular, to be able to fill out
function pointers easily), the following structures and functions
are available::

  typedef struct{
    int slot;    /* slot id, see below */
    void *pfunc; /* function pointer */
  } PyType_Slot;

  struct{
    const char* name;
    const char* doc;
    int basicsize;
    int itemsize;
    int flags;
    PyType_Slot *slots; /* terminated by slot==0. */
  } PyType_Spec;

  PyObject* PyType_FromSpec(PyType_Spec*);

To specify a slot, a unique slot id must be provided. New Python
versions may introduce new slot ids, but slot ids will never be
recycled. Slots may get deprecated, but continue to be supported
throughout Python 3.x.

The slot ids are named like the field names of the structures that
hold the pointers in Python 3.1, with an added ``Py_`` prefix (i.e.
Py_tp_dealloc instead of just tp_dealloc):

- tp_dealloc, tp_print, tp_getattr, tp_setattr, tp_repr,
  tp_hash, tp_call, tp_str, tp_getattro, tp_setattro,
  tp_doc, tp_traverse, tp_clear, tp_richcompare, tp_iter,
  tp_iternext, tp_methods, tp_base, tp_descr_set, tp_descr_set,
  tp_init, tp_alloc, tp_new, tp_is_gc, tp_bases, tp_del
- nb_add nb_subtract nb_multiply nb_remainder nb_divmod nb_power
  nb_negative nb_positive nb_absolute nb_bool nb_invert nb_lshift
  nb_rshift nb_and nb_xor nb_or nb_int nb_float nb_inplace_add
  nb_inplace_subtract nb_inplace_multiply nb_inplace_remainder
  nb_inplace_power nb_inplace_lshift nb_inplace_rshift nb_inplace_and
  nb_inplace_xor nb_inplace_or nb_floor_divide nb_true_divide
  nb_inplace_floor_divide nb_inplace_true_divide nb_index
- sq_length sq_concat sq_repeat sq_item sq_ass_item was_sq_ass_slice
  sq_contains sq_inplace_concat sq_inplace_repeat
- mp_length mp_subscript mp_ass_subscript
- bf_getbuffer bf_releasebuffer

XXX Not supported yet: tp_weaklistoffset, tp_dictoffset

The following fields cannot be set during type definition:
- tp_dict tp_mro tp_cache tp_subclasses tp_weaklist

Functions and function-like Macros
----------------------------------

All functions starting with _Py are not available to applications.
Also, all functions that expect parameter types that are unavailable
to applications are excluded from the ABI, such as PyAST_FromNode
(which expects a ``node*``).

All other functions are available, unless excluded below.

Function-like macros (in particular, field access macros) remain
available to applications, but get replaced by function calls
(unless their definition only refers to features of the ABI, such
as the various _Check macros)

ABI function declarations will not change their parameters or return
types. If a change to the signature becomes necessary, a new function
will be introduced. If the new function is source-compatible (e.g. if
just the return type changes), an alias macro may get added to
redirect calls to the new function when the applications is
recompiled.

If continued provision of the old function is not possible, it may get
deprecated, then removed, in accordance with PEP 7, causing
applications that use that function to break.

Excluded Functions
------------------

Functions declared in the following header files are not part
of the ABI:
- cellobject.h
- classobject.h
- code.h
- frameobject.h
- funcobject.h
- genobject.h
- pyarena.h
- pydebug.h
- symtable.h
- token.h
- traceback.h

Global Variables
----------------

Global variables representing types and exceptions are available
to applications.
XXX provide a complete list.

XXX should restrict list of globals to truly "builtin" stuff,
excluding everything that can also be looked up through imports.

XXX may specify access to predefined types and exceptions through
the interpreter state, with appropriate Get macros.

Other Macros
------------

All macros defining symbolic constants are available to applications;
the numeric values will not change.

In addition, the following macros are available:

- Py_BEGIN_ALLOW_THREADS, Py_BLOCK_THREADS, Py_UNBLOCK_THREADS,
  Py_END_ALLOW_THREADS

Linkage
-------

On Windows, applications shall link with python3.dll; an import
library python3.lib will be available. This DLL will redirect all of
its API functions through /export linker options to the full
interpreter DLL, i.e. python3y.dll.

XXX is it possible to redirect global variables in the same way?
If not, python3.dll would have to copy them, and we should verify
that all available global variables are read-only.

On Unix systems, the ABI is typically provided by the python
executable itself. PyModule_Create is changed to pass ``3`` as the API
version if the extension module was compiled with Py_LIMITED_API; the
version check for the API version will accept either 3 or the current
PYTHON_API_VERSION as conforming. If Python is compiled as a shared
library, it is installed as both libpython3.so, and libpython3.y.so;
applications conforming to this PEP should then link to the former.

XXX is it possible to make the soname libpython.so.3, and still
have some applications link to libpython3.y.so?

Implementation Strategy
=======================

This PEP will be implemented in a branch, allowing users to check
whether their modules conform to the ABI. To simplify this testing, an
additional macro Py_LIMITED_API_WITH_TYPES will expose the existing
type object layout, to let users postpone rewriting all types. When
the this branch is merged into the 3.2 code base, this macro will
be removed.

Copyright
=========

This document has been placed in the public domain.


From paul at boddie.org.uk  Sun May 17 17:27:55 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Sun, 17 May 2009 14:27:55 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
Message-ID: <1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>

On 17 Mai, 14:05, jer... at martinfamily.freeserve.co.uk wrote:
> From a user point of view I think that adding a 'par' construct to
> Python for parallel loops would add a lot of power and simplicity,
> e.g.
>
> par i in list:
> ? ? updatePartition(i)

You can do this right now with a small amount of work to make
updatePartition a callable which works in parallel, and without the
need for extra syntax. For example, with the pprocess module, you'd
use boilerplate like this:

  import pprocess
  queue = pprocess.Queue(limit=ncores)
  updatePartition = queue.manage(pprocess.MakeParallel
(updatePartition))

(See http://www.boddie.org.uk/python/pprocess/tutorial.html#Map for
details.)

At this point, you could use a normal "for" loop, and you could then
"sync" for results by reading from the queue. I'm sure it's a similar
story with the multiprocessing/processing module.

> There would be no locking and it would be the programmer's
> responsibility to ensure that the loop was truly parallel and correct.

Yes, that's the idea.

> The intention of this would be to speed up Python execution on multi-
> core platforms. Within a few years we will see 100+ core processors as
> standard and we need to be ready for that.

In what sense are we not ready? Perhaps the abstractions could be
better, but it's definitely possible to run Python code on multiple
cores today and get decent core utilisation.

> There could also be parallel versions of map, filter and reduce
> provided.

Yes, that's what pprocess.pmap is for, and I imagine that other
solutions offer similar facilities.

> BUT...none of this would be possible with the current implementation
> of Python with its Global Interpreter Lock, which effectively rules
> out true parallel processing.
>
> See:http://jessenoller.com/2009/02/01/python-threads-and-the-global-inter...
>
> What do others think?

That your last statement is false: true parallel processing is
possible today. See the Wiki for a list of solutions:

http://wiki.python.org/moin/ParallelProcessing

In addition, Jython and IronPython don't have a global interpreter
lock, so you have the option of using threads with those
implementations, too.

Paul


From dirkjan at ochtman.nl  Sun May 17 17:47:07 2009
From: dirkjan at ochtman.nl (Dirkjan Ochtman)
Date: Sun, 17 May 2009 23:47:07 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A107988.3020202@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>
Message-ID: <ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>

On Sun, May 17, 2009 at 10:54 PM, "Martin v. L?wis" <martin at v.loewis.de> wrote:
> Excluded Functions
> ------------------
>
> Functions declared in the following header files are not part
> of the ABI:
> - cellobject.h
> - classobject.h
> - code.h
> - frameobject.h
> - funcobject.h
> - genobject.h
> - pyarena.h
> - pydebug.h
> - symtable.h
> - token.h
> - traceback.h

What kind of effect does this have on optimization efforts, for
example all the stuff done by Antoine Pitrou over the last few months,
and the first few results from unladen? Will it mean we won't get to
the good optimizations until 4.0? Or does it just mean unladen swallow
takes longer to come back to trunk (until 4.0) and every extension
author who wants to be compatible with it will basically have the same
burden as now?

Cheers,

Dirkjan


From martin at v.loewis.de  Sun May 17 18:07:59 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Mon, 18 May 2009 00:07:59 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>
References: <4A107988.3020202@v.loewis.de>
	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>
Message-ID: <4A108ABF.9060909@v.loewis.de>

>> Functions declared in the following header files are not part
>> of the ABI:
>> - cellobject.h
>> - classobject.h
>> - code.h
>> - frameobject.h
>> - funcobject.h
>> - genobject.h
>> - pyarena.h
>> - pydebug.h
>> - symtable.h
>> - token.h
>> - traceback.h
> 
> What kind of effect does this have on optimization efforts, for
> example all the stuff done by Antoine Pitrou over the last few months,
> and the first few results from unladen? 

I fail to see the relationship, so: no effect that I can see.

Why do you think that optimization efforts could be related to
the PEP 384 proposal?

Regards,
Martin


From sebastian.serrano at gmail.com  Sun May 17 18:34:37 2009
From: sebastian.serrano at gmail.com (sserrano)
Date: Sun, 17 May 2009 15:34:37 -0700 (PDT)
Subject: Creating temperory files for a web application
References: <8ecb859e-9a35-4213-93d5-53833e5be7d7@f41g2000pra.googlegroups.com>
Message-ID: <2acf15d7-9a43-4199-a060-b7fcba705f92@g20g2000vba.googlegroups.com>

I would use a js plotting library, like http://code.google.com/p/flot/

On 8 mayo, 06:26, koranthala <koranth... at gmail.com> wrote:
> Hi,
> ? ?I am doing web development using Django. I need to create an image
> (chart) and show it to the users - based on some data which user
> selects.
> ? ?My question is - how do I create a temporary image for the user? I
> thought of tempfile, but I think it will be deleted once the process
> is done - which would happen by the time user starts seeing the image.
> I can think of no other option other than to have another script which
> will delete all images based on time of creation.
> ? ?Since python is extensively used for web development, I guess this
> should be an usual scenario for many people here. How do you usually
> handle this?



From dirkjan at ochtman.nl  Sun May 17 18:34:52 2009
From: dirkjan at ochtman.nl (Dirkjan Ochtman)
Date: Mon, 18 May 2009 00:34:52 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A108ABF.9060909@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>
	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>
	<4A108ABF.9060909@v.loewis.de>
Message-ID: <ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>

On Mon, May 18, 2009 at 12:07 AM, "Martin v. L?wis" <martin at v.loewis.de> wrote:
> I fail to see the relationship, so: no effect that I can see.
>
> Why do you think that optimization efforts could be related to
> the PEP 384 proposal?

It would seem to me that optimizations are likely to require data
structure changes, for exactly the kind of core data structures that
you're talking about locking down. But that's just a high-level view,
I might be wrong.

Cheers,

Dirkjan


From dinov at microsoft.com  Sun May 17 18:48:05 2009
From: dinov at microsoft.com (Dino Viehland)
Date: Sun, 17 May 2009 22:48:05 +0000
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>
References: <4A107988.3020202@v.loewis.de>
	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>
	<4A108ABF.9060909@v.loewis.de>
	<ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>
Message-ID: <1A472770E042064698CB5ADC83A12ACD016E82D6@TK5EX14MBXC116.redmond.corp.microsoft.com>

Dirkjan Ochtman wrote:
>
> It would seem to me that optimizations are likely to require data
> structure changes, for exactly the kind of core data structures that
> you're talking about locking down. But that's just a high-level view,
> I might be wrong.
>


In particular I would guess that ref counting is the biggest issue here.
I would think not directly exposing the field and having inc/dec ref
Functions (real methods, not macros) for it would give a lot more
ability to change the API in the future.

It also might make it easier for alternate implementations to support
the same API so some modules could work cross implementation - but I
suspect that's a non-goal of this PEP :).

Other fields directly accessed (via macros or otherwise) might have similar
problems but they don't seem as core as ref counting.

From martin at v.loewis.de  Sun May 17 18:53:00 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Mon, 18 May 2009 00:53:00 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>
References: <4A107988.3020202@v.loewis.de>	
	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>	
	<4A108ABF.9060909@v.loewis.de>
	<ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>
Message-ID: <4A10954C.6070401@v.loewis.de>

Dirkjan Ochtman wrote:
> On Mon, May 18, 2009 at 12:07 AM, "Martin v. L?wis" <martin at v.loewis.de> wrote:
>> I fail to see the relationship, so: no effect that I can see.
>>
>> Why do you think that optimization efforts could be related to
>> the PEP 384 proposal?
> 
> It would seem to me that optimizations are likely to require data
> structure changes, for exactly the kind of core data structures that
> you're talking about locking down. But that's just a high-level view,
> I might be wrong.

Ah. It's exactly the opposite: The purpose of the PEP is not to lock
the data structures down, but to allow more flexible evolution of
them - by completely hiding them from extension modules.

Currently, any data structure change must be weighed for its impact
on binary compatibility. With the PEP, changing structures can
be done fairly freely - with the exception of the very few structures
that do get locked down. In particular, the list of header files
that you quoted precisely contains the structures that can be
modified with no impact on the ABI.

I'm not aware that any of the structures that I propose to lock
would be relevant for optimization - but I might be wrong. If so,
I'd like to know, and it would be possible to add accessor functions
in cases where extension modules might still legitimately want to
access certain fields.

Certain changes to the VM would definitely be binary-incompatible,
such as removal of reference counting. However, such a change would
probably have a much wider effect, breaking not just binary
compatibility, but also source compatibility. It would be justified
to call a Python release that makes such a change 4.0.

Regards,
Martin


From egrefen at gmail.com  Sun May 17 18:53:07 2009
From: egrefen at gmail.com (Edward Grefenstette)
Date: Sun, 17 May 2009 15:53:07 -0700 (PDT)
Subject: Help with Tkinter on OS X --- driving me insane!
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
Message-ID: <f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>

I thought of this. I uninstalled Tk from macports, but the same error
crops up. Evidently, Tk 8.5 remains installed somewhere else, but I
don't know where. How can I find out?

Best,
Edward

>
>
> Have you installed Tk version 8.5?
>
> If so, remove it. You might also install the latest 8.4 version.
> --
> Piet van Oostrum <p... at cs.uu.nl>
> URL:http://pietvanoostrum.com[PGP 8DAE142BE17999C4]
> Private email: p... at vanoostrum.org



From martin at v.loewis.de  Sun May 17 19:04:21 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Mon, 18 May 2009 01:04:21 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <1A472770E042064698CB5ADC83A12ACD016E82D6@TK5EX14MBXC116.redmond.corp.microsoft.com>
References: <4A107988.3020202@v.loewis.de>	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>	<4A108ABF.9060909@v.loewis.de>
	<ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>
	<1A472770E042064698CB5ADC83A12ACD016E82D6@TK5EX14MBXC116.redmond.corp.microsoft.com>
Message-ID: <4A1097F5.2050009@v.loewis.de>

Dino Viehland wrote:
> Dirkjan Ochtman wrote:
>> It would seem to me that optimizations are likely to require data
>> structure changes, for exactly the kind of core data structures that
>> you're talking about locking down. But that's just a high-level view,
>> I might be wrong.
>>
> 
> 
> In particular I would guess that ref counting is the biggest issue here.
> I would think not directly exposing the field and having inc/dec ref
> Functions (real methods, not macros) for it would give a lot more
> ability to change the API in the future.

In the context of optimization, I'm skeptical that introducing functions
for the reference counting would be useful. Making the INCREF/DECREF
macros functions just in case the reference counting goes away is IMO
an unacceptable performance cost.

Instead, such a change should go through the regular deprecation
procedure and/or cause the release of Python 4.0.

> It also might make it easier for alternate implementations to support
> the same API so some modules could work cross implementation - but I
> suspect that's a non-goal of this PEP :).

Indeed :-) I'm also skeptical that this would actually allow
cross-implementation modules to happen. The list of functions that
an alternate implementation would have to provide is fairly long.

The memory management APIs in particular also assume a certain layout
of Python objects in general, namely that they start with a header
whose size is a compile-time constant. Again, making this more flexible
"just in case" would also impact performance, and probably fairly badly
so.

> Other fields directly accessed (via macros or otherwise) might have similar
> problems but they don't seem as core as ref counting.

Access to the type object reference is probably similar. All the other
structs are used "directly" in C code, with no accessor macros.

Regards,
Martin


From aljosa.mohorovic at gmail.com  Sun May 17 19:14:06 2009
From: aljosa.mohorovic at gmail.com (Aljosa Mohorovic)
Date: Sun, 17 May 2009 16:14:06 -0700 (PDT)
Subject: http://orbited.org/ - anybody using it?
Message-ID: <471d72a1-f1d3-4feb-a692-c3d62ec41ce9@n4g2000vba.googlegroups.com>

can anybody comment on http://orbited.org/ ?
is it an active project? does it work?

Aljosa Mohorovic


From skrobul at skrobul.com  Sun May 17 19:20:54 2009
From: skrobul at skrobul.com (skrobul)
Date: Sun, 17 May 2009 16:20:54 -0700 (PDT)
Subject: how to verify SSL certificate chain  -  M2 Crypto library?
Message-ID: <6862c613-8d4d-440c-b656-0bba165aef8f@s21g2000vbb.googlegroups.com>

Hi,

is there any simple way to do SSL certificate chain validation using
M2Crypto or any other library ?

Basically what I want to achieve is to be able to say if certificate
chain contained in 'XYZ.pem' file is issued by known CA (list of
common root-CA's certs should be loaded from separate directory).
Right now I do it by spawning command 'openssl verify -CApath
<ca_certs_path> XYZ.pem' and it works. However I think that there must
be a simpler way.

 I've spent last few hours trying to go through M2Crypto sources and
API "documentation" but the only possible way that I've found is
spawning separate server thread listening on some port, and connecting
just to verify if cert chain is valid, but going this way is at least
not right. The other approach which I've tried is using low-level
function m2.X509_verify() but it does not work as I expect. It returns
0 (which means valid) even if CA certificate is not known.

Any suggestions / tips ?

thanks,
Marek Skrobacki


From steve at REMOVE-THIS-cybersource.com.au  Sun May 17 19:26:14 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 17 May 2009 23:26:14 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de>
	<02204669$0$25303$c3e8da3@news.astraweb.com>
	<77b3koF1go3t7U1@mid.uni-berlin.de>
Message-ID: <02209010$0$25303$c3e8da3@news.astraweb.com>

On Sun, 17 May 2009 20:34:00 +0200, Diez B. Roggisch wrote:

>>> My math-skills are a bit too rusty to qualify the exact nature of the
>>> operation, commutativity springs to my mind.
>> 
>> And how is reduce() supposed to know whether or not some arbitrary
>> function is commutative?
> 
> I don't recall anybody saying it should know that - do you? The OP wants
> to introduce parallel variants, not replace the existing ones.

Did I really need to spell it out? From context, I'm talking about the 
*parallel version* of reduce().



-- 
Steven


From foom at fuhm.net  Sun May 17 19:35:59 2009
From: foom at fuhm.net (James Y Knight)
Date: Sun, 17 May 2009 19:35:59 -0400
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A107988.3020202@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>
Message-ID: <64C7B6A8-2273-4A41-9CFA-72B7B1D05361@fuhm.net>


On May 17, 2009, at 4:54 PM, Martin v. L?wis wrote:
> Currently, each feature release introduces a new name for the
> Python DLL on Windows, and may cause incompatibilities for extension
> modules on Unix. This PEP proposes to define a stable set of API
> functions which are guaranteed to be available for the lifetime
> of Python 3, and which will also remain binary-compatible across
> versions. Extension modules and applications embedding Python
> can work with different feature releases as long as they restrict
> themselves to this stable ABI.


It seems like a good ideal to strive for.

But I think this is too strong a promise. IMO it would be better to  
say that ABI compatibility across releases is a goal. If someone does  
make a change that breaks the ABI, I'd expect whomever is proposing it  
to put forth a fairly strong argument towards why it's a worthwhile  
change. But it should be possible and allowed, given the right  
circumstances. Because I think it's pretty much inevitable that it  
*will* need to happen, sometime.

(of course there will need to be ABI tests, so that any potential ABI  
breakages are known about when they occur)

Python is much more defined by its source language than its C  
extension API, so tying the python major version number to the C ABI  
might not be the best idea from a "marketing" standpoint. (I can see  
it now..."Python 4.0 major new features: we changed the C method  
definition struct layout incompatibly" :)

James

From fuzzyman at voidspace.org.uk  Sun May 17 19:53:12 2009
From: fuzzyman at voidspace.org.uk (Michael Foord)
Date: Mon, 18 May 2009 00:53:12 +0100
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A1097F5.2050009@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>	<4A108ABF.9060909@v.loewis.de>	<ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>	<1A472770E042064698CB5ADC83A12ACD016E82D6@TK5EX14MBXC116.redmond.corp.microsoft.com>
	<4A1097F5.2050009@v.loewis.de>
Message-ID: <4A10A368.1060406@voidspace.org.uk>

Martin v. L?wis wrote:
> Dino Viehland wrote:
>   
>> Dirkjan Ochtman wrote:
>>     
>>> It would seem to me that optimizations are likely to require data
>>> structure changes, for exactly the kind of core data structures that
>>> you're talking about locking down. But that's just a high-level view,
>>> I might be wrong.
>>>
>>>       
>> In particular I would guess that ref counting is the biggest issue here.
>> I would think not directly exposing the field and having inc/dec ref
>> Functions (real methods, not macros) for it would give a lot more
>> ability to change the API in the future.
>>     
>
> In the context of optimization, I'm skeptical that introducing functions
> for the reference counting would be useful. Making the INCREF/DECREF
> macros functions just in case the reference counting goes away is IMO
> an unacceptable performance cost.
>
> Instead, such a change should go through the regular deprecation
> procedure and/or cause the release of Python 4.0.
>
>   
>> It also might make it easier for alternate implementations to support
>> the same API so some modules could work cross implementation - but I
>> suspect that's a non-goal of this PEP :).
>>     
>
> Indeed :-) I'm also skeptical that this would actually allow
> cross-implementation modules to happen. The list of functions that
> an alternate implementation would have to provide is fairly long.
>
>   

Just in case you're unaware of it; the company I work for has an open 
source project called Ironclad. This *is* a reimplementation of the 
Python C API and gives us binary compatibility with [some subset of] 
Python C extensions for use from IronPython.

http://www.resolversystems.com/documentation/index.php/Ironclad.html

It's an ambitious project but it is now at the stage where 1000s of the 
Numpy and Scipy tests pass when run from IronPython. I don't think this 
PEP impacts the project, but it is not completely unfeasible for the 
alternative implementations to do this.

In particular we have had to address the issue of the GIL and extensions 
(IronPython has no GIL) and reference counting (which IronPython also 
doesn't) use.

Michael Foord



-- 
http://www.ironpythoninaction.com/
http://www.voidspace.org.uk/blog




From kw at codebykevin.com  Sun May 17 19:58:16 2009
From: kw at codebykevin.com (Kevin Walzer)
Date: Sun, 17 May 2009 19:58:16 -0400
Subject: Help with Tkinter on OS X --- driving me insane!
In-Reply-To: <f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
	<f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
Message-ID: <4A10A498.8040100@codebykevin.com>

Edward Grefenstette wrote:
> I thought of this. I uninstalled Tk from macports, but the same error
> crops up. Evidently, Tk 8.5 remains installed somewhere else, but I
> don't know where. How can I find out?
> 
> Best,
> Edward
> 

Look in /Library/Frameworks...

Kevin Walzer
Code by Kevin
http://www.codebykevin.com


From steve at REMOVE-THIS-cybersource.com.au  Sun May 17 20:04:45 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 18 May 2009 00:04:45 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<mailman.290.1242577147.8015.python-list@python.org>
	<02204763$0$25303$c3e8da3@news.astraweb.com>
	<77b3pkF1go3t7U2@mid.uni-berlin.de>
Message-ID: <02209917$0$25303$c3e8da3@news.astraweb.com>

On Sun, 17 May 2009 20:36:36 +0200, Diez B. Roggisch wrote:

>> But reduce() can't tell whether the function being applied is
>> commutative or not. I suppose it could special-case a handful of
>> special cases (e.g. operator.add for int arguments -- but not floats!)
>> or take a caller- supplied argument that tells it whether the function
>> is commutative or not. But in general, you can't assume the function
>> being applied is commutative or associative, so unless you're willing
>> to accept undefined behaviour, I don't see any practical way of
>> parallelizing reduce().
> 
> def reduce(operation, sequence, startitem=None, parallelize=False)
> 
> should be enough. Approaches such as OpenMP also don't guess, they use
> explicit annotations.

It would be nice if the OP would speak up and tell us what he intended, 
so we didn't have to guess what he meant. We're getting further and 
further away from his original suggestion of a "par" loop.

If you pass parallize=True, then what? Does it assume that operation is 
associative, or take some steps to ensure that it is? Does it guarantee 
to perform the operations in a specific order, or will it potentially 
give non-deterministic results depending on the order that individual 
calculations come back?

As I said earlier, parallelizing map() sounds very plausible to me, but 
the approaches that people have talked about for parallelizing reduce() 
so far sound awfully fragile and magically to me. But at least I've 
learned one thing: given an associative function, you *can* parallelize 
reduce using a tree. (Thanks Roy!)



-- 
Steven


From nad at acm.org  Sun May 17 20:09:07 2009
From: nad at acm.org (Ned Deily)
Date: Sun, 17 May 2009 17:09:07 -0700
Subject: Help with Tkinter on OS X --- driving me insane!
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
	<f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
Message-ID: <nad-57E73C.17090717052009@news.gmane.org>

In article 
<f9435b73-5001-48d9-b2e8-6fd8663396e7 at l32g2000vba.googlegroups.com>,
 Edward Grefenstette <egrefen at gmail.com> wrote:
> I thought of this. I uninstalled Tk from macports, but the same error
> crops up. Evidently, Tk 8.5 remains installed somewhere else, but I
> don't know where. How can I find out?

Look in /Library/Frameworks for Tcl.framework and Tk.framework.  You can 
safely delete those if you don't need them.  But also make sure you 
update to the latest 2.6 (currently 2.6.2) python.org version; as noted, 
the original 2.6 python.org release had issues with user-installed Tcl 
and Tk frameworks.

-- 
 Ned Deily,
 nad at acm.org



From andrew at acooke.org  Sun May 17 20:20:58 2009
From: andrew at acooke.org (andrew cooke)
Date: Sun, 17 May 2009 20:20:58 -0400 (CLT)
Subject: Generic web parser
In-Reply-To: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
References: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
Message-ID: <d18bd43aa982b99a1d165cae1bf1738c.squirrel@acooke.dyndns.org>


http://groups.google.com/group/beautifulsoup/browse_thread/thread/d416dd19fdaa43a6

http://jjinux.blogspot.com/2008/10/python-some-notes-on-lxml.html

andrew




From egrefen at gmail.com  Sun May 17 21:06:55 2009
From: egrefen at gmail.com (Edward Grefenstette)
Date: Sun, 17 May 2009 18:06:55 -0700 (PDT)
Subject: Help with Tkinter on OS X --- driving me insane!
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
	<f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
	<mailman.307.1242605361.8015.python-list@python.org>
Message-ID: <f2f2ff3e-f314-468d-9fdd-8bf883fb9723@n4g2000vba.googlegroups.com>

Thanks to Kevin and Ned for the pointers.
The question is now this. Running find tells me I have tk.h in the
following locations:
===
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Tk.framework/
Versions/8.4/Headers/tk.h
/Developer/SDKs/MacOSX10.4u.sdk/usr/include/tk.h
/Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Tk.framework/
Versions/8.4/Headers/tk.h
/Developer/SDKs/MacOSX10.5.sdk/usr/include/tk.h
/Library/Frameworks/Tk.framework/Versions/8.5/Headers/tk.h
/System/Library/Frameworks/Tk.framework/Versions/8.4/Headers/tk.h
/usr/include/tk.h
/usr/local/WordNet-3.0/include/tk/tk.h
===

This seams to entail that the Tk 8.4 framework seems to be installed
in
===
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Tk.framework/
Versions/8.4/
/Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Tk.framework/
Versions/8.4/Headers/tk.h
/System/Library/Frameworks/Tk.framework/Versions/8.4/Headers/tk.h
===

Whereas Tk 8.5 is installed in:
===
/Library/Frameworks/Tk.framework/Versions/8.5/
===

Which ones should I delete? Should I remove all the other tk.h files?

Sorry if these are rather dumb questions, but I really do appreciate
the help.

Best,
Edward

On May 18, 1:09?am, Ned Deily <n... at acm.org> wrote:
> In article
> <f9435b73-5001-48d9-b2e8-6fd866339... at l32g2000vba.googlegroups.com>,
> ?Edward Grefenstette <egre... at gmail.com> wrote:
>
> > I thought of this. I uninstalled Tk from macports, but the same error
> > crops up. Evidently, Tk 8.5 remains installed somewhere else, but I
> > don't know where. How can I find out?
>
> Look in /Library/Frameworks for Tcl.framework and Tk.framework. ?You can
> safely delete those if you don't need them. ?But also make sure you
> update to the latest 2.6 (currently 2.6.2) python.org version; as noted,
> the original 2.6 python.org release had issues with user-installed Tcl
> and Tk frameworks.
>
> --
> ?Ned Deily,
> ?n... at acm.org



From kw at codebykevin.com  Sun May 17 21:27:37 2009
From: kw at codebykevin.com (Kevin Walzer)
Date: Sun, 17 May 2009 21:27:37 -0400
Subject: Help with Tkinter on OS X --- driving me insane!
In-Reply-To: <f2f2ff3e-f314-468d-9fdd-8bf883fb9723@n4g2000vba.googlegroups.com>
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
	<f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
	<mailman.307.1242605361.8015.python-list@python.org>
	<f2f2ff3e-f314-468d-9fdd-8bf883fb9723@n4g2000vba.googlegroups.com>
Message-ID: <4A10B989.5020709@codebykevin.com>

Edward Grefenstette wrote:

> 
> Whereas Tk 8.5 is installed in:
> ===
> /Library/Frameworks/Tk.framework/Versions/8.5/
> ===
>

Delete this one if you want to ensure that Python sees 8.4.

-- 
Kevin Walzer
Code by Kevin
http://www.codebykevin.com


From egrefen at gmail.com  Sun May 17 22:32:49 2009
From: egrefen at gmail.com (Edward Grefenstette)
Date: Sun, 17 May 2009 19:32:49 -0700 (PDT)
Subject: Help with Tkinter on OS X --- driving me insane!
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
	<f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
	<mailman.307.1242605361.8015.python-list@python.org>
	<f2f2ff3e-f314-468d-9fdd-8bf883fb9723@n4g2000vba.googlegroups.com>
	<4A10B989.5020709@codebykevin.com>
Message-ID: <c094cd74-78a3-46dc-9a53-6da08c19e7d3@o30g2000vbc.googlegroups.com>

Bingo! Updating to Python 6.2.2 did the trick (I had 6.2). I just had
to relink the /usr/bin/python to the Current directory in /Library/
Frameworks/Python.framework/Versions/ and everything worked without
deletions etc. Thanks for your help, everyone!

Best,
Edward


From agaskins_ng at kelleramerica.com  Sun May 17 22:33:38 2009
From: agaskins_ng at kelleramerica.com (Adam Gaskins)
Date: Mon, 18 May 2009 02:33:38 GMT
Subject: Generating Tones With Python
Message-ID: <6O3Ql.26152$ho7.16117@newsfe10.iad>

I am pretty sure this shouldn't be as hard as I'm making it to be, but 
how does one go about generating tones of specific frequency, volume, and 
L/R pan? I've been digging around the internet for info, and found a few 
examples. One was with gstreamer, but I can't find much in the 
documentation to explain how to do this. Also some people said to use 
tksnack snack, but the one example I found to do this didn't do  anything 
on my machine, no error or sounds. I'd like this to be cross platform, 
but at this point I just want to do it any way I can.

Thanks,
-Adam


From nad at acm.org  Sun May 17 22:58:05 2009
From: nad at acm.org (Ned Deily)
Date: Sun, 17 May 2009 19:58:05 -0700
Subject: Help with Tkinter on OS X --- driving me insane!
References: <a46f7e4a-6a5a-4891-9ea6-3abe7adc97b4@e23g2000vbe.googlegroups.com>
	<m2ab5buchs.fsf@cs.uu.nl>
	<f9435b73-5001-48d9-b2e8-6fd8663396e7@l32g2000vba.googlegroups.com>
	<mailman.307.1242605361.8015.python-list@python.org>
	<f2f2ff3e-f314-468d-9fdd-8bf883fb9723@n4g2000vba.googlegroups.com>
	<4A10B989.5020709@codebykevin.com>
	<c094cd74-78a3-46dc-9a53-6da08c19e7d3@o30g2000vbc.googlegroups.com>
Message-ID: <nad-96E90D.19580517052009@news.gmane.org>

In article 
<c094cd74-78a3-46dc-9a53-6da08c19e7d3 at o30g2000vbc.googlegroups.com>,
 Edward Grefenstette <egrefen at gmail.com> wrote:
> Bingo! Updating to Python 6.2.2 did the trick (I had 6.2). I just had
> to relink the /usr/bin/python to the Current directory in /Library/
> Frameworks/Python.framework/Versions/ and everything worked without
> deletions etc. Thanks for your help, everyone!

Glad that helped but beware: changing /usr/bin/python is not 
recommended.  That link (and everything else in /usr/bin) is maintained 
by Apple and should always point to the OSX-supplied python at
/System/Library/Python.framework/Versions/2.5/bin/python

By default, the python.org installers create links at 
/usr/local/bin/python and /usr/local/bin/python2.6; use one of those 
paths to get to the python.org 2.6 or ensure /usr/local/bin comes before 
/usr/bin on your $PATH.

-- 
 Ned Deily,
 nad at acm.org



From Wwy58 at yahoo.com  Sun May 17 23:51:44 2009
From: Wwy58 at yahoo.com (David)
Date: Sun, 17 May 2009 20:51:44 -0700 (PDT)
Subject: Python mail truncate problem
Message-ID: <4db625fe-158d-4b04-af0b-23e54c3ae22b@e23g2000vbe.googlegroups.com>

Hi,

I am writing Python script to process e-mails in a user's mail
account. What I want to do is to update that e-mail's Status to 'R'
after processing it, however, the following script truncates old e-
mails even though it updates that e-mail's Status correctly. Anybody
knows how to fix this?

Thanks so much.

  fp = '/var/spool/mail/' + user
                mbox = mailbox.mbox(fp)

                for key, msg in mbox.iteritems():
                        flags = msg.get_flags()

                        if 'R' not in flags:
                                # now process the e-mail
                                # now update status
                                msg.add_flag('R' + flags)
                                mbox[key] = msg



From wuwei23 at gmail.com  Mon May 18 00:24:06 2009
From: wuwei23 at gmail.com (alex23)
Date: Sun, 17 May 2009 21:24:06 -0700 (PDT)
Subject: http://orbited.org/ - anybody using it?
References: <471d72a1-f1d3-4feb-a692-c3d62ec41ce9@n4g2000vba.googlegroups.com>
Message-ID: <d13b1e1a-1dd9-496f-a11c-199b0c22ab74@j18g2000prm.googlegroups.com>

On May 18, 9:14?am, Aljosa Mohorovic <aljosa.mohoro... at gmail.com>
wrote:
> can anybody comment onhttp://orbited.org/?
> is it an active project? does it work?

I have no idea about your second question but looking at PyPI,the
module was last updated on the 9th of this much, so I'd say it's very
much an active project:

http://pypi.python.org/pypi/orbited/0.7.9


From matusu at gmail.com  Mon May 18 00:39:14 2009
From: matusu at gmail.com (Matus)
Date: Mon, 18 May 2009 06:39:14 +0200
Subject: Generating Tones With Python
In-Reply-To: <6O3Ql.26152$ho7.16117@newsfe10.iad>
References: <6O3Ql.26152$ho7.16117@newsfe10.iad>
Message-ID: <4A10E672.9060401@gmail.com>

try http://www.pygame.org, as far as I remember there is a way to
generate sound arrays though not sure aboout the pan

m

Adam Gaskins wrote:
> I am pretty sure this shouldn't be as hard as I'm making it to be, but 
> how does one go about generating tones of specific frequency, volume, and 
> L/R pan? I've been digging around the internet for info, and found a few 
> examples. One was with gstreamer, but I can't find much in the 
> documentation to explain how to do this. Also some people said to use 
> tksnack snack, but the one example I found to do this didn't do  anything 
> on my machine, no error or sounds. I'd like this to be cross platform, 
> but at this point I just want to do it any way I can.
> 
> Thanks,
> -Adam


From notontheweb at noisp.com  Mon May 18 01:18:12 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Sun, 17 May 2009 22:18:12 -0700
Subject: Which C compiler?
Message-ID: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>

I am using Python 2.4.  I need to make a native Python extension for 
Windows XP.  I have both VC++ 6.0 and Visual C++ 2005 Express Edition. 
Will VC++ 6.0 do the trick?  That would be easier for me, because the 
project is written for that one.  If not, will the 2005 compiler do it?

Thanks much,
"Jive"


From notontheweb at noisp.com  Mon May 18 01:27:39 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Sun, 17 May 2009 22:27:39 -0700
Subject: Which C compiler?
In-Reply-To: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>
Message-ID: <fl6Ql.345236$UQ6.184175@en-nntp-03.dc1.easynews.com>

P.s. I just found out that there's a new Express edition, 2008. (New to 
me, that is.)  I'm installing it.


From martin at v.loewis.de  Mon May 18 02:00:57 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Mon, 18 May 2009 08:00:57 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A10A368.1060406@voidspace.org.uk>
References: <4A107988.3020202@v.loewis.de>	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>	<4A108ABF.9060909@v.loewis.de>	<ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>	<1A472770E042064698CB5ADC83A12ACD016E82D6@TK5EX14MBXC116.redmond.corp.microsoft.com>
	<4A1097F5.2050009@v.loewis.de> <4A10A368.1060406@voidspace.org.uk>
Message-ID: <4A10F999.5050106@v.loewis.de>

>>> It also might make it easier for alternate implementations to support
>>> the same API so some modules could work cross implementation - but I
>>> suspect that's a non-goal of this PEP :).
>>>     
>>
>> Indeed :-) I'm also skeptical that this would actually allow
>> cross-implementation modules to happen. The list of functions that
>> an alternate implementation would have to provide is fairly long.
>>
>>   
> 
> Just in case you're unaware of it; the company I work for has an open
> source project called Ironclad.

I was unaware indeed; thanks for pointing this out.

IIUC, it's not just an API emulation, but also an ABI emulation.

> In particular we have had to address the issue of the GIL and extensions
> (IronPython has no GIL) and reference counting (which IronPython also
> doesn't) use.

I think this somewhat strengthens the point I was trying to make: An
alternate implementation that tries to be API compatible has to consider
so many things that it is questionable whether making Py_INCREF/DECREF
functions would be any simplification.

So I just ask:
a) Would it help IronClad if it could restrict itself to PEP 384
   compatible modules?
b) Would further restrictions in the PEP help that cause?

Regards,
Martin


From research at johnohagan.com  Mon May 18 02:33:03 2009
From: research at johnohagan.com (John O'Hagan)
Date: Mon, 18 May 2009 06:33:03 +0000
Subject: Generating Tones With Python
In-Reply-To: <6O3Ql.26152$ho7.16117@newsfe10.iad>
References: <6O3Ql.26152$ho7.16117@newsfe10.iad>
Message-ID: <200905180633.03992.research@johnohagan.com>

On Mon, 18 May 2009, Adam Gaskins wrote:
> I am pretty sure this shouldn't be as hard as I'm making it to be, but
> how does one go about generating tones of specific frequency, volume, and
> L/R pan? I've been digging around the internet for info, and found a few
> examples. One was with gstreamer, but I can't find much in the
> documentation to explain how to do this. Also some people said to use
> tksnack snack, but the one example I found to do this didn't do  anything
> on my machine, no error or sounds. I'd like this to be cross platform,
> but at this point I just want to do it any way I can.
[...]

I've done this using the subprocess module to call the sox program (which has 
a built-in synth to generate customisable tones, and can play sound files) or 
using the socket module to send control messages to a running instance of the 
fluidsynth program (which can generate sound using soundfonts). The former is 
very simple, the latter is very responsive to quick changes. I think both 
programs are cross-platform.

HTH,

John


From usernet at ilthio.net  Mon May 18 02:33:59 2009
From: usernet at ilthio.net (Tim Harig)
Date: Mon, 18 May 2009 06:33:59 GMT
Subject: Generating Tones With Python
References: <6O3Ql.26152$ho7.16117@newsfe10.iad>
Message-ID: <rj7Ql.16450$hc1.12050@flpi150.ffdc.sbc.com>

On 2009-05-18, Adam Gaskins <agaskins_ng at kelleramerica.com> wrote:
> I am pretty sure this shouldn't be as hard as I'm making it to be, but 
> how does one go about generating tones of specific frequency, volume, and 
> L/R pan? I've been digging around the internet for info, and found a few 

This can be done with SDL which would be my first suggestion.
There doesn't seem to be a direct Python SDL module but pygame seems to
encompass the SDL interface.  If that doesn't work for you might be able
to write python wrappers and the C SDL functions.

A second option, on Windows, may be to interface DirectX.  This would not
be cross platform and I don't personally know anything about it; but, it
should be possible to work with DirectX.  I found this with a Google
search:

http://directpython.sourceforge.net/


Finally, if all else fails you can generate the PCM directly and pipe it to
an external interface.  I have never actually written anything that
actually output sounds directly; but, I have written a module to generate
morse tones wave files:

info:
	http://ilthio.net/page.cgi?doc=n20
script:
	http://ilthio.net/page.cgi?txt=cw.py

Look inside of the oscillator class.  I used an 8bit samplewidth with
1 channel to save space (I originally did implement it in 16bit mono).
To do more complex sounds, you will probably need to a 16 bit channel.
Note that 8bit wave files use unsigned integer values, little endian while
16 bit wave files use signed integers, little endian, two's compliment.
For L/R pan, you will also need to create the second channel waveform.  You
can easily find good references for the different wave file PCM formats
with a search engine query.

If the SDL interface doesn't work for you, then you might be able to
generate a PCM format and pipe it to an external player.  In this scenerio
you would likely ignore actually creating the wave file.  You would instead
just create the raw PCM format inside of the array container and then
pipe bits of it out to the wave player program.  Without the format data
contained in the RIFF header of the wave file, you will need to inform
the player as to exactly what format you will be feeding it.  Most Unix
players have command line options that will allow you to specify the
format.  I am not sure whether Windows based players allow similar
options.  Under Linux, you could pipe the stream directly to the sound
card device inteface file in the /dev filesystem if you know what bitrate
the soundcard uses internally.

This would likely require a second process or second thread to make sure
that you can feed the PCM output in real time.


From stefan_ml at behnel.de  Mon May 18 02:54:53 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 18 May 2009 08:54:53 +0200
Subject: Conceptual flaw in pxdom?
In-Reply-To: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
Message-ID: <4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>

Emanuele D'Arrigo wrote:
> I'm looking at pxdom and in particular at its foundation class
> DOMObject

I didn't know pxdom, but looking at it now I can see that it hasn't been
updated since 2006. Not sure if that means that it is complete or that it
has been abandoned.

Anyway, seeing that it only provides DOM compliance, without anything
further like XPath or whatever, and that it doesn't focus on performance in
any way, you might still be better off with ElementTree, which is in the
stdlib since Python 2.5 (and available for Py2.2+).

Stefan


From martin at v.loewis.de  Mon May 18 03:07:27 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Mon, 18 May 2009 09:07:27 +0200
Subject: Which C compiler?
In-Reply-To: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>
Message-ID: <4a11092f$0$30903$9b622d9e@news.freenet.de>

Jive Dadson wrote:
> I am using Python 2.4.  I need to make a native Python extension for
> Windows XP.  I have both VC++ 6.0 and Visual C++ 2005 Express Edition.
> Will VC++ 6.0 do the trick?  That would be easier for me, because the
> project is written for that one.  If not, will the 2005 compiler do it?

In general, to build extension modules, you need to use the same VC
version as the one that was used to build Python. For 2.4, that would
be Visual Studio 2003. So if you use VC 6, VS 2005, or VS 2008, you
may run into problems.

Depending on what exactly the extension module does, it might work
fine also.

Regards,
Martin


From eckhardt at satorlaser.com  Mon May 18 03:31:33 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 18 May 2009 09:31:33 +0200
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
Message-ID: <mff7e6-e43.ln1@satorlaser.homedns.org>

Steve Ferg wrote:
> On the one hand, there are developers who love big IDEs with lots of
> features (code generation, error checking, etc.), and rely on them to
> provide the high level of support needed to be reasonably productive
> in heavy-weight languages (e.g. Java).
> 
> On the other hand there are developers who much prefer to keep things
> light-weight and simple.  They like clean high-level languages (e.g.
> Python) which are compact enough that you can keep the whole language
> in your head, and require only a good text editor to be used
> effectively.

This distinction is IMHO not correct. If you took a look at Java, you would
notice that the core language syntax is much simpler than Python's. OTOH,
if you add the standard libraries, you would soon see that Python's
libraries are not as consistent (i.e. conformant to PEP8) as Java's.

What makes up for Python's perceived usability problems though is the
commandline parser that allows you to inspect the type of an object and its
parts of it at runtime, in particular the docstrings are a treasure there.

That said, an IDE that provides auto-completion (e.g. that gives you a list
of available class members) is a good thing in Java, because you don't have
to browse the documentation as often. With Python, that is impossible
because there are no types bound to parameters, so any type that fits is
allowed (duck typing).

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From boblatest at googlemail.com  Mon May 18 03:51:43 2009
From: boblatest at googlemail.com (boblatest at googlemail.com)
Date: Mon, 18 May 2009 00:51:43 -0700 (PDT)
Subject: How to convert a list of strings to a tuple of floats?
Message-ID: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>

Hello group,

this is the conversion I'm looking for:

['1.1', '2.2', '3.3'] -> (1.1, 2.2, 3.3)

Currently I'm "disassembling" the list by hand, like this:

    fields = line.split('; ')
    for x in range(len(fields)):
        fields[x] = float(fields[x])
    ftuple = tuple(fields)

Of course it works, but it looks inelegant. Is there a more Pythonisch
way of doing this? In C I'd just use sscanf.

robert


From wuwei23 at gmail.com  Mon May 18 03:58:59 2009
From: wuwei23 at gmail.com (alex23)
Date: Mon, 18 May 2009 00:58:59 -0700 (PDT)
Subject: How to convert a list of strings to a tuple of floats?
References: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
Message-ID: <1a610e05-9278-4ffa-96c9-eb919239a206@g31g2000pra.googlegroups.com>

On May 18, 5:51?pm, "boblat... at googlemail.com"
<boblat... at googlemail.com> wrote:
> ['1.1', '2.2', '3.3'] -> (1.1, 2.2, 3.3)
>
> Currently I'm "disassembling" the list by hand, like this:
>
> ? ? fields = line.split('; ')
> ? ? for x in range(len(fields)):
> ? ? ? ? fields[x] = float(fields[x])
> ? ? ftuple = tuple(fields)
>
> Of course it works, but it looks inelegant. Is there a more Pythonisch
> way of doing this? In C I'd just use sscanf.

Either:

    ftuple = tuple(map(float, fields))

Or the BDFL-endorsed:

    ftuple = tuple(float(f) for f in fields)


From clp2 at rebertia.com  Mon May 18 04:00:10 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 18 May 2009 01:00:10 -0700
Subject: How to convert a list of strings to a tuple of floats?
In-Reply-To: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
References: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
Message-ID: <50697b2c0905180100p5efa05e1ked09ec08a63a1218@mail.gmail.com>

On Mon, May 18, 2009 at 12:51 AM, boblatest at googlemail.com
<boblatest at googlemail.com> wrote:
> Hello group,
>
> this is the conversion I'm looking for:
>
> ['1.1', '2.2', '3.3'] -> (1.1, 2.2, 3.3)
>
> Currently I'm "disassembling" the list by hand, like this:
>
> ? ?fields = line.split('; ')
> ? ?for x in range(len(fields)):
> ? ? ? ?fields[x] = float(fields[x])
> ? ?ftuple = tuple(fields)
>
> Of course it works, but it looks inelegant. Is there a more Pythonisch
> way of doing this? In C I'd just use sscanf.

ftuple = tuple(float(field) for field in fields)

See the docs on "generator expressions" for more info.

Cheers,
Chris
-- 
http://blog.rebertia.com


From eckhardt at satorlaser.com  Mon May 18 04:06:48 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 18 May 2009 10:06:48 +0200
Subject: How to convert a list of strings to a tuple of floats?
References: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
Message-ID: <phh7e6-p83.ln1@satorlaser.homedns.org>

boblatest at googlemail.com wrote:
> this is the conversion I'm looking for:
> 
> ['1.1', '2.2', '3.3'] -> (1.1, 2.2, 3.3)
> 
> Currently I'm "disassembling" the list by hand, like this:
> 
>     fields = line.split('; ')
>     for x in range(len(fields)):
>         fields[x] = float(fields[x])
>     ftuple = tuple(fields)
> 
> Of course it works, but it looks inelegant.

temp = map(float, x)
ftuple = tuple(temp)

Of course this is also possible to write in a single line.

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From jeremiah.dodds at gmail.com  Mon May 18 04:29:54 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Mon, 18 May 2009 09:29:54 +0100
Subject: Generic web parser
In-Reply-To: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
References: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
Message-ID: <12cbbbfc0905180129m13d3f89bt588be8c08d96be35@mail.gmail.com>

On Sat, May 16, 2009 at 2:18 PM, S.Selvam <s.selvamsiva at gmail.com> wrote:

> Hi all,
>
> I have to design web parser which will visit the given list of websites and
> need to fetch a particular set of details.
> It has to be so generic that even if we add new websites, it must fetch
> those details if available anywhere.
> So it must be something like a framework.
>
> Though i have done some parsers ,but they will parse for a given
> format(For. eg It will get the data from <title> tag).But here each website
> may have different format and the information may available within any tags.
>
> I know its a tough task for me,but i feel with python it should be
> possible.
> My request is, if such thing is already available please let me know ,also
> your suggestions are welcome.
>
> Note: I planned to use BeautifulSoup for parsing.
>
> --
> Yours,
> S.Selvam
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
I'd recommend mechanize in combination with BeautifulSoup - it greatly
simplifies most web-scraping tasks.
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From boblatest at googlemail.com  Mon May 18 04:36:51 2009
From: boblatest at googlemail.com (boblatest at googlemail.com)
Date: Mon, 18 May 2009 01:36:51 -0700 (PDT)
Subject: Prepackaged function args
Message-ID: <fbdbe1a9-2a20-4be4-a031-2ee367387224@x6g2000vbg.googlegroups.com>

Hello group,

suppose I've got a function f() that takes N parameters, and a list
(or tuple) arg[] with N elements that I'd like to pass as parameters.
The straightforward function call looks like this:

result = f(arg[0], arg[1], ..., arg[N-1])

Is there a less verbose way of accomlishing this?

Thanks,
robert


From eckhardt at satorlaser.com  Mon May 18 04:37:12 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 18 May 2009 10:37:12 +0200
Subject: os.path.split gets confused with combined \\ and /
References: <mailman.278.1242555066.8015.python-list@python.org>
Message-ID: <paj7e6-bb3.ln1@satorlaser.homedns.org>

Stef Mientki wrote:
> I've to distribute both python files and data files.
> Everything is developed under windows and now the datafiles contains
> paths with mixed \\ and /.

For your info: Some (!!!) parts of MS Windows understand forward slashes as
path separators and disallows them in file names, so you can often get away
with mixed paths. However, no POSIX system will understand a backslash as
path separator, which is a normal (though unusual) character in a file
name.

> Under windows everthing is working well,
> but under Ubuntu / Fedora sometimes strange errors occurs.
> Now I was thinking that using os.path.split would solve all problems,
> but if I've the following relative path
> 
>     path1/path2\\filename.dat
> 
> split will deliver the following under windows
>    path = path1 / path2
>    filename = filename.dat
> 
> while under Linux it will give me
>    path = path1
>    filename = path\\filename.dat
> 
> So I'm now planning to replace all occurences of os.path.split with a
> call to the following function
> 
> def path_split ( filename ) :
>     # under Ubuntu a filename with both
>     # forward and backward slashes seems to give trouble
>     # already in os.path.split
>     filename = filename.replace ( '\\','/')
> 
>     return os.path.split ( filename )
> 
> how do others solve this problem ?
> Are there better ways to solve this problem ?

Your data files must not contain OS-dependent paths. So, I would recommend
that you simply use forward slashes exclusively there, because those are
most common as path separators. Under POSIX systems like Ubuntu, you can
then use them 'as-is', while under win32 you would first convert them to
paths with backslashes (os.path.separator). Generalised, you could do
something like this:

  indep_path = string.split(line, data_path_separator)
  native_path = os.path.join(indep_path)

'data_path_separator' would then of course have to be the type of path
separator that is defined for your data format, per above I would suggest
slashes.

Uli


-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From paul at boddie.org.uk  Mon May 18 04:41:10 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Mon, 18 May 2009 01:41:10 -0700 (PDT)
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>

On 18 Mai, 08:54, Stefan Behnel <stefan... at behnel.de> wrote:
> Emanuele D'Arrigo wrote:
> > I'm looking at pxdom and in particular at its foundation class
> > DOMObject
>
> I didn't know pxdom, but looking at it now I can see that it hasn't been
> updated since 2006. Not sure if that means that it is complete or that it
> has been abandoned.

Maybe the developer is mostly satisfied with it.

> Anyway, seeing that it only provides DOM compliance, without anything
> further like XPath or whatever, and that it doesn't focus on performance in
> any way, you might still be better off with ElementTree, which is in the
> stdlib since Python 2.5 (and available for Py2.2+).

To put the inquirer's remarks in context, I suggested that he look at
pxdom specifically as a replacement for minidom and in response to the
following statement: "I've used etree and lxml successfully before but
I wanted to understand how close I can get to the W3C DOM standards."
Maybe you missed that thread, but here's a link to it:

http://groups.google.com/group/comp.lang.python/browse_frm/thread/d445363b99001ad6

Paul


From ben+python at benfinney.id.au  Mon May 18 04:44:35 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 18 May 2009 18:44:35 +1000
Subject: How to convert a list of strings to a tuple of floats?
References: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
Message-ID: <87vdny7qbw.fsf@benfinney.id.au>

"boblatest at googlemail.com" <boblatest at googlemail.com> writes:

> Hello group,
> 
> this is the conversion I'm looking for:
> 
> ['1.1', '2.2', '3.3'] -> (1.1, 2.2, 3.3)
> 
> Currently I'm "disassembling" the list by hand, like this:
> 
>     fields = line.split('; ')
>     for x in range(len(fields)):
>         fields[x] = float(fields[x])
>     ftuple = tuple(fields)
> 
> Of course it works, but it looks inelegant. Is there a more Pythonisch
> way of doing this?

You can create a tuple by calling the tuple type with an iterable, where
each item from the iterable becomes an element in the created tuple.

    >>> tuple([4, 5, 6])
    (4, 5, 6)

You can create an iterable with a generator expression:

    >>> for n in (x**2 for x in range(5)):
    ...     print n
    ... 
    0
    1
    4
    9
    16

Combine the two, creating a tuple from a generator expression:

    >>> fields = ['1.1', '2.2', '3.3']
    >>> record = tuple(
    ...     float(text) for text in fields)
    >>> record
    (1.1000000000000001, 2.2000000000000002, 3.2999999999999998)

-- 
 \        ?Nothing so needs reforming as other people's habits.? ?Mark |
  `\                                       Twain, _Pudd'n'head Wilson_ |
_o__)                                                                  |
Ben Finney


From clp2 at rebertia.com  Mon May 18 04:47:23 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 18 May 2009 01:47:23 -0700
Subject: Prepackaged function args
In-Reply-To: <fbdbe1a9-2a20-4be4-a031-2ee367387224@x6g2000vbg.googlegroups.com>
References: <fbdbe1a9-2a20-4be4-a031-2ee367387224@x6g2000vbg.googlegroups.com>
Message-ID: <50697b2c0905180147w605f6aaer79cd1df769edb928@mail.gmail.com>

On Mon, May 18, 2009 at 1:36 AM, boblatest at googlemail.com
<boblatest at googlemail.com> wrote:
> Hello group,
>
> suppose I've got a function f() that takes N parameters, and a list
> (or tuple) arg[] with N elements that I'd like to pass as parameters.
> The straightforward function call looks like this:
>
> result = f(arg[0], arg[1], ..., arg[N-1])

result = f(*arg)

Cheers,
Chris
-- 
http://blog.rebertia.com


From mail at johnohagan.com  Mon May 18 05:00:15 2009
From: mail at johnohagan.com (John O'Hagan)
Date: Mon, 18 May 2009 09:00:15 +0000
Subject: Prepackaged function args
In-Reply-To: <fbdbe1a9-2a20-4be4-a031-2ee367387224@x6g2000vbg.googlegroups.com>
References: <fbdbe1a9-2a20-4be4-a031-2ee367387224@x6g2000vbg.googlegroups.com>
Message-ID: <200905180900.15430.mail@johnohagan.com>

On Mon, 18 May 2009, boblatest at googlemail.com wrote:
> Hello group,
>
> suppose I've got a function f() that takes N parameters, and a list
> (or tuple) arg[] with N elements that I'd like to pass as parameters.
> The straightforward function call looks like this:
>
> result = f(arg[0], arg[1], ..., arg[N-1])
>
> Is there a less verbose way of accomlishing this?
[...]

result = f(*arg)

Regards,

John



From bluefisher80 at gmail.com  Mon May 18 05:18:52 2009
From: bluefisher80 at gmail.com (Jim Qiu)
Date: Mon, 18 May 2009 17:18:52 +0800
Subject: A newbie question about some code
Message-ID: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>

Hi everyone.
I am reading a python library code and found something i can not understand.
Please help!

class Envelope(object):

    def __init__(self,ta_info):
        self.ta_info = ta_info


    def writefilelist(self,ta_list,tofile):
        for filename in ta_list:
            fromfile = botslib.botsopendata(filename,
'rb',self.ta_info['charset'])
            shutil.copyfileobj(fromfile,tofile)
            fromfile.close()

    def convertfilelist(self,ta_list):
        return [botslib.botsgetabspathdata(filename) for filename in
ta_list]



class myxmlenvelop(Envelope):
    def __init__(self,ta_info,ta_list):
        ''' class for (test) xml envelope. There is no standardised
XML-envelope!
            writes a new XML-tree; uses places-holders for XML-files to
include; real enveloping is done by ElementTree's include'''
        self.ta_info = ta_info
        self._openoutenvelope()
        #~ self.out.put({'BOTSID':'root','xmlns:xi':"
http://www.w3.org/2001/XInclude"})     #works, but attribute is not removed
bij ETI.include
        self.out.put({'BOTSID':'root'})
        ta_list = self.convertfilelist(ta_list)
        for filename in ta_list:
            self.out.put({'BOTSID':'root'},{'BOTSID':'{
http://www.w3.org/2001/XInclude}include','parse':"xml",'href':filename})
        self.out.envelopewrite(self.out.root


Please check the blue highlighted part,  I don't understand how the object
get the property?


Jim
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From jeremy at martinfamily.freeserve.co.uk  Mon May 18 05:27:06 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Mon, 18 May 2009 02:27:06 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
Message-ID: <477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>

On 17 May, 22:27, Paul Boddie <p... at boddie.org.uk> wrote:
> On 17 Mai, 14:05, jer... at martinfamily.freeserve.co.uk wrote:
>
> > From a user point of view I think that adding a 'par' construct to
> > Python for parallel loops would add a lot of power and simplicity,
> > e.g.
>
> > par i in list:
> > ? ? updatePartition(i)
>
> You can do this right now with a small amount of work to make
> updatePartition a callable which works in parallel, and without the
> need for extra syntax. For example, with the pprocess module, you'd
> use boilerplate like this:
>
> ? import pprocess
> ? queue = pprocess.Queue(limit=ncores)
> ? updatePartition = queue.manage(pprocess.MakeParallel
> (updatePartition))
>
> (Seehttp://www.boddie.org.uk/python/pprocess/tutorial.html#Mapfor
> details.)
>
> At this point, you could use a normal "for" loop, and you could then
> "sync" for results by reading from the queue. I'm sure it's a similar
> story with the multiprocessing/processing module.
>
> > There would be no locking and it would be the programmer's
> > responsibility to ensure that the loop was truly parallel and correct.
>
> Yes, that's the idea.
>
> > The intention of this would be to speed up Python execution on multi-
> > core platforms. Within a few years we will see 100+ core processors as
> > standard and we need to be ready for that.
>
> In what sense are we not ready? Perhaps the abstractions could be
> better, but it's definitely possible to run Python code on multiple
> cores today and get decent core utilisation.
>
> > There could also be parallel versions of map, filter and reduce
> > provided.
>
> Yes, that's what pprocess.pmap is for, and I imagine that other
> solutions offer similar facilities.
>
> > BUT...none of this would be possible with the current implementation
> > of Python with its Global Interpreter Lock, which effectively rules
> > out true parallel processing.
>
> > See:http://jessenoller.com/2009/02/01/python-threads-and-the-global-inter...
>
> > What do others think?
>
> That your last statement is false: true parallel processing is
> possible today. See the Wiki for a list of solutions:
>
> http://wiki.python.org/moin/ParallelProcessing
>
> In addition, Jython and IronPython don't have a global interpreter
> lock, so you have the option of using threads with those
> implementations, too.
>
> Paul

Hi Paul and others,

Thanks for your responses to my original questions.

Paul, thanks for explaining about the pprocess module which appears
very useful. I presume that this is using multiple operating system
processes rather than threads which would probably imply that it is
suitable for coarse grained parallel programming rather than fine-
grained because of overhead in starting up new processes and sharing
objects. (How is that done, by the way?). It probably has advantages
and disadvantages compared with thread based parallelism.

My suggestion is primarily about using multiple threads and sharing
memory - something akin to the OpenMP directives that one of you has
mentioned. To do this efficiently would involve removing the Global
Interpreter Lock, or switching to Jython or Iron Python as you
mentioned.

However I *do* actually want to add syntax to the language. I think
that 'par' makes sense as an official Python construct - we already
have had this in the Occam programming language for twenty-five years.
The reason for this is ease of use. I would like to make it easy for
amateur programmers to exploit natural parallelism in their
algorithms. For instance somebody who wishes to calculate a property
of each member from a list of chemical structures using the Python
Daylight interface: with my suggestion they could potentially get a
massive speed up just by changing 'for' to 'par' or 'map' to 'pmap'.
(Or map with a parallel keyword argument set as suggested). At present
they would have to manually chop up their work and run it as multiple
processes in order to achieve the same - fine for expert programmers
but not reasonable for people working in other domains who wish to use
Python as a utility because of its fantastic productivity and ease of
use.

Let me clarify what I think par, pmap, pfilter and preduce would mean
and how they would be implemented. A par loop is like a for loop,
however the programmer is saying that the order in which the
iterations are performed doesn't matter and they might be performed in
parallel. The python system then has the option to allocate a number
of threads to the task and share out the iterations accordingly
between the threads. (It might be that the programmer should be
allowed to explictly define the number of threads to use or can
delegate that decision to the system). Parallel pmap and pfilter would
be implemented in much the same way, although the resultant list might
have to be reassembled from the partial results returned from each
thread. As people have pointed out, parallel reduce is a tricky option
because it requires the binary operation to be associative in which
case it can be parallelised by calculating the result using a tree-
based evaluation strategy.

I have used all of OpenMP, MPI, and Occam in the past. OpenMP adds
parallelism to programs by the use of special comment strings, MPI by
explicit calls to library routines, and Occam by explicit syntactical
structures. Each has its advantages. I like the simplicity of OpenMP,
the cross-language portability of MPI and the fact the concurrency is
built in to the Occam language. What I am proposing here is a hybrid
of the OpenMP and Occam approaches - a change to the language which is
very natural and yet is easy for programmers to understand.
Concurrency is generally regarded as the hardest concept for
programmers to grasp.

Jeremy


From rhodri at wildebst.demon.co.uk  Mon May 18 05:30:15 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 18 May 2009 10:30:15 +0100
Subject: A newbie question about some code
In-Reply-To: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
References: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
Message-ID: <op.ut4cops9a8ncjz@gnudebst>

On Mon, 18 May 2009 10:18:52 +0100, Jim Qiu <bluefisher80 at gmail.com> wrote:

> Please check the blue highlighted part,  I don't understand how the  
> object
> get the property?

Colours and highlighting don't come across in Usenet postings.  Could
you be a bit more specific.  Which object, and what property?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From clp2 at rebertia.com  Mon May 18 05:31:35 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 18 May 2009 02:31:35 -0700
Subject: A newbie question about some code
In-Reply-To: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
References: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
Message-ID: <50697b2c0905180231q4be49ff7jb6ead12109747d43@mail.gmail.com>

On Mon, May 18, 2009 at 2:18 AM, Jim Qiu <bluefisher80 at gmail.com> wrote:
> Hi everyone.
> I am reading a python library code and found something i can not understand.
> Please help!
> class Envelope(object):
> ?? ?def __init__(self,ta_info):
> ?? ? ? ?self.ta_info = ta_info
>
> ?? ?def writefilelist(self,ta_list,tofile):
> ?? ? ? ?for filename in ta_list:
> ?? ? ? ? ? ?fromfile = botslib.botsopendata(filename,
> 'rb',self.ta_info['charset'])
> ?? ? ? ? ? ?shutil.copyfileobj(fromfile,tofile)
> ?? ? ? ? ? ?fromfile.close()
> ?? ?def convertfilelist(self,ta_list):
> ?? ? ? ?return [botslib.botsgetabspathdata(filename) for filename in
> ta_list]
>
>
> class myxmlenvelop(Envelope):
> ?? ?def __init__(self,ta_info,ta_list):
> ?? ? ? ?''' class for (test) xml envelope. There is no standardised
> XML-envelope!
> ?? ? ? ? ? ?writes a new XML-tree; uses places-holders for XML-files to
> include; real enveloping is done by ElementTree's include'''
> ?? ? ? ?self.ta_info = ta_info
> ?? ? ? ?self._openoutenvelope()
> ?? ? ? ?#~
> self.out.put({'BOTSID':'root','xmlns:xi':"http://www.w3.org/2001/XInclude"})
> ? ? #works, but attribute is not removed bij ETI.include
> ?? ? ? ?self.out.put({'BOTSID':'root'})
> ?? ? ? ?ta_list = self.convertfilelist(ta_list)
> ?? ? ? ?for filename in ta_list:
>
> ?self.out.put({'BOTSID':'root'},{'BOTSID':'{http://www.w3.org/2001/XInclude}include','parse':"xml",'href':filename})
> ?? ? ? ?self.out.envelopewrite(self.out.root
>
> Please check the blue highlighted part, ?I don't understand how the object
> get the property?

I would guess the `out` attribute is created in _openoutenvelope(),
but you didn't include all the code, so it's impossible to be sure.

Also, I'd recommend keeping your posts in plaintext in the future
rather than relying on HTML formatting.

Cheers,
Chris
-- 
http://blog.rebertia.com


From phihag at phihag.de  Mon May 18 05:49:15 2009
From: phihag at phihag.de (Philipp Hagemeister)
Date: Mon, 18 May 2009 11:49:15 +0200
Subject: .pth in current directory: Why doesn't it work as the documentation
	says?
Message-ID: <4A112F1B.8010109@phihag.de>

Where is the fault in my reasoning here?

1) According to http://docs.python.org/dev/install/, "The most
convenient way is to add a path configuration file to a directory that?s
already on Python?s path, (...).

2) Path configuration files have an extension of .pth, (...)"

1&2 => 3) A file test.pth with the content "/example/" should result in
sys.path containing "/example/".

4) "" (the current directory) is the first element of my sys.path

1&4 => 5) The current directory qualifies for "a directory that?s
already on Python?s path,"

1&3&5 => 6) echo /example/ > test.pth; python -c 'import
sys;print(repr(sys.path))' should contain '/example'.


I think I misinterpreted the documentation, but what exactly is wrong here?

Regards,

Philipp

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From deets at nospam.web.de  Mon May 18 06:08:26 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 18 May 2009 12:08:26 +0200
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<02200d22$0$20645$c3e8da3@news.astraweb.com>
	<_vidnQW0dJoGg43XnZ2dnUVZ_hpi4p2d@posted.usinternet>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de>
	<02204669$0$25303$c3e8da3@news.astraweb.com>
	<77b3koF1go3t7U1@mid.uni-berlin.de>
	<02209010$0$25303$c3e8da3@news.astraweb.com>
Message-ID: <77cq8sF1h6po8U1@mid.uni-berlin.de>

Steven D'Aprano wrote:

> On Sun, 17 May 2009 20:34:00 +0200, Diez B. Roggisch wrote:
> 
>>>> My math-skills are a bit too rusty to qualify the exact nature of the
>>>> operation, commutativity springs to my mind.
>>> 
>>> And how is reduce() supposed to know whether or not some arbitrary
>>> function is commutative?
>> 
>> I don't recall anybody saying it should know that - do you? The OP wants
>> to introduce parallel variants, not replace the existing ones.
> 
> Did I really need to spell it out? From context, I'm talking about the
> *parallel version* of reduce().

>From what context - your permanent arguing that there is no way for reduce
to determine if the passed operation is associative (which no one claimed
to be possible, nor to be needed)? No, from *that* context it wasn't clear.

It's the programmer who decides which version to use.

Diez


From david.lyon at preisshare.net  Mon May 18 06:46:54 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Mon, 18 May 2009 06:46:54 -0400
Subject: .pth in current directory: Why doesn't it work as the
	documentation =?UTF-8?Q?says=3F?=
In-Reply-To: <4A112F1B.8010109@phihag.de>
References: <4A112F1B.8010109@phihag.de>
Message-ID: <884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>

On Mon, 18 May 2009 11:49:15 +0200, Philipp Hagemeister <phihag at phihag.de>
wrote:
> 1) According to http://docs.python.org/dev/install/, "The most
> convenient way is to add a path configuration file to a directory
that?s
> already on Python?s path, (...).

It's true...

> 2) Path configuration files have an extension of .pth, (...)"

Yes.

> 1&2 => 3) A file test.pth with the content "/example/" should result in
> sys.path containing "/example/".

No. Python, once finding the .pth will process it. 

> 
> 4) "" (the current directory) is the first element of my sys.path

Not always - but maybe it is. Let's not assume anything.

> 
> 1&4 => 5) The current directory qualifies for "a directory that?s
> already on Python?s path,"


> 
> 1&3&5 => 6) echo /example/ > test.pth; python -c 'import
> sys;print(repr(sys.path))' should contain '/example'.
> 
> 
> I think I misinterpreted the documentation, but what exactly is wrong
here?

What are you expecting? and maybe we can tell you why you aren't getting
it...

David


From lists at cheimes.de  Mon May 18 06:57:34 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 18 May 2009 12:57:34 +0200
Subject: .pth in current directory: Why doesn't it work as the
	documentation says?
In-Reply-To: <4A112F1B.8010109@phihag.de>
References: <4A112F1B.8010109@phihag.de>
Message-ID: <gureuu$nlj$1@ger.gmane.org>

Philipp Hagemeister schrieb:
> Where is the fault in my reasoning here?

Python processes .pth files only in some directories. The directories are

 * the global site-packages directory
 * the user site-packages directory (starting with Python 2.6)
 * and any directory that is added by a .pth file

The feature is implemented and documented in the site.py file.

Christian



From kalyanchakravarthy at hyit.com  Mon May 18 07:01:28 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Mon, 18 May 2009 16:31:28 +0530
Subject: How can i use Spread Sheet as Data Store
Message-ID: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>

Hi All,
             I have data in Spread Sheet ( First Name and Last Name), how
can i see  this data  in Python code ( how can i use Spread Sheet as Data
Store ) .

-- 
Regards
Kalyan
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From hackingkk at gmail.com  Mon May 18 07:08:17 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Mon, 18 May 2009 16:38:17 +0530
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
Message-ID: <1242644897.5644.1.camel@kk-laptop>

Hi Kaliyan,
It is very simple.
There is a library called odfpy which you can use to read and write odf
documents.  I highly recommend using open formats so that the API is
clear and you can ask help if needed.
The odfpy library has modules to create spreadsheets and read or write
by row or sell etc.

happy hacking.
Krishnakant.
 
On Mon, 2009-05-18 at 16:31 +0530, Kalyan Chakravarthy wrote:
> Hi All,
>              I have data in Spread Sheet ( First Name and Last Name),
> how can i see  this data  in Python code ( how can i use Spread Sheet
> as Data Store ) . 
> 
> -- 
> Regards
> Kalyan
> 



From fuzzyman at voidspace.org.uk  Mon May 18 07:17:37 2009
From: fuzzyman at voidspace.org.uk (Michael Foord)
Date: Mon, 18 May 2009 12:17:37 +0100
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A10F999.5050106@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>	<ea2499da0905171447n5a353b61w1c98a91bf3617e5c@mail.gmail.com>	<4A108ABF.9060909@v.loewis.de>	<ea2499da0905171534vca080dci473d2ee9f9915668@mail.gmail.com>	<1A472770E042064698CB5ADC83A12ACD016E82D6@TK5EX14MBXC116.redmond.corp.microsoft.com>
	<4A1097F5.2050009@v.loewis.de> <4A10A368.1060406@voidspace.org.uk>
	<4A10F999.5050106@v.loewis.de>
Message-ID: <4A1143D1.1050806@voidspace.org.uk>

Martin v. L?wis wrote:
>>>> It also might make it easier for alternate implementations to support
>>>> the same API so some modules could work cross implementation - but I
>>>> suspect that's a non-goal of this PEP :).
>>>>     
>>>>         
>>> Indeed :-) I'm also skeptical that this would actually allow
>>> cross-implementation modules to happen. The list of functions that
>>> an alternate implementation would have to provide is fairly long.
>>>
>>>   
>>>       
>> Just in case you're unaware of it; the company I work for has an open
>> source project called Ironclad.
>>     
>
> I was unaware indeed; thanks for pointing this out.
>
> IIUC, it's not just an API emulation, but also an ABI emulation.
>
>   

Correct.

>> In particular we have had to address the issue of the GIL and extensions
>> (IronPython has no GIL) and reference counting (which IronPython also
>> doesn't) use.
>>     
>
> I think this somewhat strengthens the point I was trying to make: An
> alternate implementation that tries to be API compatible has to consider
> so many things that it is questionable whether making Py_INCREF/DECREF
> functions would be any simplification.
>   

It would actually have been helpful for us, but I understand that it 
would be a big performance hit. The Ironclad garbage collection 
mechanism is described here:

http://www.voidspace.org.uk/python/weblog/arch_d7_2009_01_24.shtml#e1055

We artificially inflate the refcount of all objects that Ironclad 
creates to 2 and hold a reference to them on the .NET side to make them 
ineligible for garbage collection.

Because we can't always know when objects have been decreffed back down 
to 1, there are some circumstances when we have to scan all the objects 
we are holding onto. If their refcount is only 1 then we no longer need 
to hold a reference them. When nothing is using them on the IronPython 
side either normal .NET garbage collection kicks in and the IronPython 
proxy object has a destructor that calls back into Ironclad and uses the 
CPython dealloc method.

> So I just ask:
> a) Would it help IronClad if it could restrict itself to PEP 384
>    compatible modules?
> b) Would further restrictions in the PEP help that cause?
>   

I've forwarded these questions to the lead developer of Ironclad 
(William Reade) along with a link to the PEP. He isn't on Python-dev so 
I may have to be a proxy for him in discussion. His initial response was 
"looks pretty sweet".

Michael

> Regards,
> Martin
>   


-- 
http://www.ironpythoninaction.com/
http://www.voidspace.org.uk/blog




From bieffe62 at gmail.com  Mon May 18 08:10:24 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Mon, 18 May 2009 05:10:24 -0700 (PDT)
Subject: Python mail truncate problem
References: <4db625fe-158d-4b04-af0b-23e54c3ae22b@e23g2000vbe.googlegroups.com>
Message-ID: <f14601f3-d8c6-4a6f-af10-7367e35311f8@q14g2000vbn.googlegroups.com>

On 18 Mag, 05:51, David <Ww... at yahoo.com> wrote:
> Hi,
>
> I am writing Python script to process e-mails in a user's mail
> account. What I want to do is to update that e-mail's Status to 'R'
> after processing it, however, the following script truncates old e-
> mails even though it updates that e-mail's Status correctly. Anybody
> knows how to fix this?
>
> Thanks so much.
>
> ? fp = '/var/spool/mail/' + user
> ? ? ? ? ? ? ? ? mbox = mailbox.mbox(fp)
>
> ? ? ? ? ? ? ? ? for key, msg in mbox.iteritems():
> ? ? ? ? ? ? ? ? ? ? ? ? flags = msg.get_flags()
>
> ? ? ? ? ? ? ? ? ? ? ? ? if 'R' not in flags:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? # now process the e-mail
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? # now update status
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? msg.add_flag('R' + flags)
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mbox[key] = msg


I have no idea about your problem. However, I believe that  the last
statement
"mbox[key] = msg" is not needed. The objects returned by
dict.iteritems are not copies but
the actual ones in the dictionary, so your msg.add_flag() already
modifies the object in mbox.

HTH

Ciao
-----
FB


From phihag at phihag.de  Mon May 18 08:34:33 2009
From: phihag at phihag.de (Philipp Hagemeister)
Date: Mon, 18 May 2009 14:34:33 +0200
Subject: .pth in current directory: Why doesn't it work as the
	documentation says?
In-Reply-To: <884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>
References: <4A112F1B.8010109@phihag.de>
	<884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>
Message-ID: <4A1155D9.6090403@phihag.de>

David Lyon wrote:
> (...)
>> 1&2 => 3) A file test.pth with the content "/example/" should result in
>> sys.path containing "/example/".
> 
> No. Python, once finding the .pth will process it. 

Yes, but that processing will add /example/ to sys.path, right?

>> 4) "" (the current directory) is the first element of my sys.path
> 
> Not always - but maybe it is. Let's not assume anything.

Of *my* sys.path. And by default, I think it is.

> (...)
>> I think I misinterpreted the documentation, but what exactly is wrong
> here?
> 
> What are you expecting? and maybe we can tell you why you aren't getting
> it...
> 
> David

I'm expecting .pth files in the current directory to be be processed,
according to docs/install/. Christian Heimes already pointed out this is
not the case; so I'm wondering whether this is a mistake in the
documentation or just my faulty logic.

Cheers,

Philipp

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From steve.ferg.bitbucket at gmail.com  Mon May 18 08:39:03 2009
From: steve.ferg.bitbucket at gmail.com (Steve Ferg)
Date: Mon, 18 May 2009 05:39:03 -0700 (PDT)
Subject: Seeking old post on developers who like IDEs vs developers who 
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
Message-ID: <9841242d-dc75-408a-8498-db856c64f65a@n8g2000vbb.googlegroups.com>

Thanks.  Your observations would make good comments on the original
blog message that I'm seeking.  Do you have a link to that blog?


From david.lyon at preisshare.net  Mon May 18 08:51:03 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Mon, 18 May 2009 08:51:03 -0400
Subject: .pth in current directory: Why doesn't it work as the
	documentation =?UTF-8?Q?says=3F?=
In-Reply-To: <4A1155D9.6090403@phihag.de>
References: <4A112F1B.8010109@phihag.de>
	<884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>
	<4A1155D9.6090403@phihag.de>
Message-ID: <c09eb35beddfb5e7f3eb73282717615b@preisshare.net>

On Mon, 18 May 2009 14:34:33 +0200, Philipp Hagemeister <phihag at phihag.de>
wrote:
> Yes, but that processing will add /example/ to sys.path, right?

It actually works the other way around. The directories listed in
sys.path are scanned for .pth files.

You can add packages by listing them inside a .PTH.

> I'm expecting .pth files in the current directory to be be processed,
> according to docs/install/. Christian Heimes already pointed out this is
> not the case; so I'm wondering whether this is a mistake in the
> documentation or just my faulty logic.

Perphaps you don't understand them yet.

.PTH files are for adding run-time packages.

May I ask why you are playing with .PTH files? they are a fairly
advanced sort of concept for describing where packages are located
to the python interpreter.

If you are using .PTH files... you should be using "import .." 
inside your code..

Regards

David


From aahz at pythoncraft.com  Mon May 18 08:56:11 2009
From: aahz at pythoncraft.com (Aahz)
Date: 18 May 2009 05:56:11 -0700
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
Message-ID: <gurltb$ar8$1@panix3.panix.com>

In article <mff7e6-e43.ln1 at satorlaser.homedns.org>,
Ulrich Eckhardt  <eckhardt at satorlaser.com> wrote:
>Steve Ferg wrote:
>>
>> On the one hand, there are developers who love big IDEs with lots of
>> features (code generation, error checking, etc.), and rely on them to
>> provide the high level of support needed to be reasonably productive
>> in heavy-weight languages (e.g. Java).
>> 
>> On the other hand there are developers who much prefer to keep things
>> light-weight and simple.  They like clean high-level languages (e.g.
>> Python) which are compact enough that you can keep the whole language
>> in your head, and require only a good text editor to be used
>> effectively.
>
>This distinction is IMHO not correct. If you took a look at Java, you would
>notice that the core language syntax is much simpler than Python's. 

That's half-true.  The problem is that you have to digest a much bigger
chunk of Java before you can start being productive.  Consider how simple
it is to write a non-regex grep in Python.  In addition, Python's object
model is simpler than Java's, not even talking about the contortions that
Java's static class model forces you into.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From marco at sferacarta.com  Mon May 18 08:59:46 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Mon, 18 May 2009 14:59:46 +0200
Subject: Seeking old post on developers who like IDEs vs developers who
	like  simple languages
In-Reply-To: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
Message-ID: <6ZcQl.18366$Ux.8657@tornado.fastwebnet.it>

Steve Ferg wrote:

> I periodically think of that blog, usually in circumstances that make
> me also think "Boy, that guy really got it right".  But despite
> repeated and prolonged bouts of googling I haven't been able to find
> the article again.  I must be using the wrong search terms or
> something.
> 
> Does anybody have a link to this article?

I think you mean this clbuttic post:

http://osteele.com/archives/2004/11/ides




From mail at timgolden.me.uk  Mon May 18 09:05:50 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 18 May 2009 14:05:50 +0100
Subject: .pth in current directory: Why doesn't it work as the
	documentation says?
In-Reply-To: <c09eb35beddfb5e7f3eb73282717615b@preisshare.net>
References: <4A112F1B.8010109@phihag.de>	<884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>	<4A1155D9.6090403@phihag.de>
	<c09eb35beddfb5e7f3eb73282717615b@preisshare.net>
Message-ID: <4A115D2E.8070905@timgolden.me.uk>

David Lyon wrote:
> On Mon, 18 May 2009 14:34:33 +0200, Philipp Hagemeister <phihag at phihag.de>
> wrote:
>> Yes, but that processing will add /example/ to sys.path, right?
> 
> It actually works the other way around. The directories listed in
> sys.path are scanned for .pth files.
> 
> You can add packages by listing them inside a .PTH.
> 
>> I'm expecting .pth files in the current directory to be be processed,
>> according to docs/install/. Christian Heimes already pointed out this is
>> not the case; so I'm wondering whether this is a mistake in the
>> documentation or just my faulty logic.
> 
> Perphaps you don't understand them yet.
> 
> .PTH files are for adding run-time packages.
> 
> May I ask why you are playing with .PTH files? they are a fairly
> advanced sort of concept for describing where packages are located
> to the python interpreter.
> 
> If you are using .PTH files... you should be using "import .." 
> inside your code..


David: I believe you're at least over-stating the case for .pth
files as "fairly advanced" and "for adding run-time packages".

According to http://docs.python.org/install/index.html and my
own reasonably long experience of them, they're just a way of
getting extra paths into sys.path. Those paths could, of course,
support adding packages, but they might not. My own has a mixture
of network directories which contain a bunch of commonly-used
modules, and entries in my subversion checkouts dir each of which
may or may not refer to a package.

The docs referred to above do indeed say "add a path configuration 
file to a directory that?s already on Python?s path" but until I
saw Christian H's post just now, I'd never bothered to understand
exactly what the mechanism was: I just stick site.pth into c:\pythonxx
and it works for me.

TJG



From thomas.vogel at likeabird.de  Mon May 18 09:19:01 2009
From: thomas.vogel at likeabird.de (thomas.vogel at likeabird.de)
Date: Mon, 18 May 2009 06:19:01 -0700 (PDT)
Subject: UDP reading on multiple sockets
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net> 
	<15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>
Message-ID: <27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>

On 17 Mai, 04:22, Grant Edwards <gra... at visi.com> wrote:
> On 2009-05-17, Thomas Vogel <thomas.vo... at likeabird.de> wrote:
>
> > I'm currently have the problem that I try to read UDP messages from
> > multiple sockets in parallel. So let's say I get UDP packets from the
> > same IP on the ports 2000, 2001, 2002,...
>
> Is there any reason you can't do it the easy way by using
> select?
>
> http://docs.python.org/library/select.html
>
> --
> Grant

The only honest answer would be that I'm totaly unfamiliar with select
and also the documentation I found wasn't able to clear the picture.
So are there examples of using select together with sockets available?

Kind regards
Thomas


From mk.fraggod at gmail.com  Mon May 18 09:29:18 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Mon, 18 May 2009 19:29:18 +0600
Subject: How to convert a list of strings to a tuple of floats?
In-Reply-To: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
References: <89f812a1-70e4-4d7f-b7d3-e456017fa869@m24g2000vbp.googlegroups.com>
Message-ID: <20090518192918.7b6f56db@coercion>

On Mon, 18 May 2009 00:51:43 -0700 (PDT)
"boblatest at googlemail.com" <boblatest at googlemail.com> wrote:

> this is the conversion I'm looking for:
> 
> ['1.1', '2.2', '3.3'] -> (1.1, 2.2, 3.3)

Since itertools are useful in nearly every module and probably are
imported already...

  import itertools as it
  ftuple = tuple(it.imap( float, line.split('; ') ))

-- 
Mike Kazantsev // fraggod.net
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From phihag at phihag.de  Mon May 18 09:40:11 2009
From: phihag at phihag.de (Philipp Hagemeister)
Date: Mon, 18 May 2009 15:40:11 +0200
Subject: .pth in current directory: Why doesn't it work as the
	documentation says?
In-Reply-To: <c09eb35beddfb5e7f3eb73282717615b@preisshare.net>
References: <4A112F1B.8010109@phihag.de>
	<884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>
	<4A1155D9.6090403@phihag.de>
	<c09eb35beddfb5e7f3eb73282717615b@preisshare.net>
Message-ID: <4A11653B.4020300@phihag.de>

David Lyon wrote:
> On Mon, 18 May 2009 14:34:33 +0200, Philipp Hagemeister <phihag at phihag.de>
> wrote:
>> Yes, but that processing will add /example/ to sys.path, right?
> 
> It actually works the other way around. The directories listed in
> sys.path are scanned for .pth files.

No, they are not. That's exactly my point. According to Christian
Heimes, *some* of the directories listed in sys.path are scanned. "" is
in sys.path, but is not scanned.

> You can add packages by listing them inside a .PTH.
> 
>> I'm expecting .pth files in the current directory to be be processed,
>> according to docs/install/. Christian Heimes already pointed out this is
>> not the case; so I'm wondering whether this is a mistake in the
>> documentation or just my faulty logic.
> 
> Perphaps you don't understand them yet.
> 
> .PTH files are for adding run-time packages.
> 
> May I ask why you are playing with .PTH files? they are a fairly
> advanced sort of concept for describing where packages are located
> to the python interpreter.
> 
> If you are using .PTH files... you should be using "import .." 
> inside your code..

I know that, and I want to use them for an application consisting of
multiple scripts, like so:

/
 mylib/
 somescripts/
   script1.py
   script2.py
   mylib.pth (contains '../mylib/')
 otherscripts/
   oscript1.py
   oscript2.py
   mylib.pth (contains '../mylib/')

If you want, you can change the final point in my original post to:

1&3&5 => 6) echo /example/ > test.pth;touch /example/libfoo.py; python
-c 'import libfoo'

Cheers,

Philipp

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From david.lyon at preisshare.net  Mon May 18 09:40:31 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Mon, 18 May 2009 09:40:31 -0400
Subject: .pth in current directory: Why doesn't it work as the
	documentation =?UTF-8?Q?says=3F?=
In-Reply-To: <4A115D2E.8070905@timgolden.me.uk>
References: <4A112F1B.8010109@phihag.de>	<884fbe87c103d292b8aea5c8986ae9cd@preisshare.net>	<4A1155D9.6090403@phihag.de>
	<c09eb35beddfb5e7f3eb73282717615b@preisshare.net>
	<4A115D2E.8070905@timgolden.me.uk>
Message-ID: <077569c046be9591d9fe7f738d64a312@preisshare.net>

On Mon, 18 May 2009 14:05:50 +0100, Tim Golden <mail at timgolden.me.uk>
wrote:

> According to http://docs.python.org/install/index.html and my
> own reasonably long experience of them, they're just a way of
> getting extra paths into sys.path. ....

Well, fair enough... 

> The docs referred to above do indeed say "add a path configuration 
> file to a directory that?s already on Python?s path" but until I
> saw Christian H's post just now, I'd never bothered to understand
> exactly what the mechanism was: I just stick site.pth into c:\pythonxx
> and it works for me.

Sure. Only I have been debugging the code lately to try to understand
how to do package installation/deinstallation for a python package 
manager. Perphaps my understunding is simplistic.

I think the area of confusion here is the word "directory". I suggest
that perphaps the term "package" is more modern.

For example, "a .PTH file in a sys.path directory contains links to all 
the packages available to python" is perphaps is clearer than :

"a .PTH file in a sys.path directory contains links to all the 
directories available to python"

Everybody knows your experience goes back a lot further than mine.

So you're probably in a much better position to explain it than me.

Good - I can go back to my code now...

:-)

David






From s.selvamsiva at gmail.com  Mon May 18 09:43:31 2009
From: s.selvamsiva at gmail.com (S.Selvam)
Date: Mon, 18 May 2009 19:13:31 +0530
Subject: Generic web parser
In-Reply-To: <12cbbbfc0905180129m13d3f89bt588be8c08d96be35@mail.gmail.com>
References: <b423b9550905160618n7ddff04n552a913a6f9b1521@mail.gmail.com>
	<12cbbbfc0905180129m13d3f89bt588be8c08d96be35@mail.gmail.com>
Message-ID: <b423b9550905180643w4dc9dae7na5d1fac067005065@mail.gmail.com>

On Mon, May 18, 2009 at 1:59 PM, Jeremiah Dodds <jeremiah.dodds at gmail.com>wrote:

>
>
> On Sat, May 16, 2009 at 2:18 PM, S.Selvam <s.selvamsiva at gmail.com> wrote:
>
>> Hi all,
>>
>> I have to design web parser which will visit the given list of websites
>> and need to fetch a particular set of details.
>> It has to be so generic that even if we add new websites, it must fetch
>> those details if available anywhere.
>> So it must be something like a framework.
>>
>> Though i have done some parsers ,but they will parse for a given
>> format(For. eg It will get the data from <title> tag).But here each website
>> may have different format and the information may available within any tags.
>>
>> I know its a tough task for me,but i feel with python it should be
>> possible.
>> My request is, if such thing is already available please let me know ,also
>> your suggestions are welcome.
>>
>> Note: I planned to use BeautifulSoup for parsing.
>>
>> --
>> Yours,
>> S.Selvam
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
> I'd recommend mechanize in combination with BeautifulSoup - it greatly
> simplifies most web-scraping tasks.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>

Thank you all for your response,

I have started to develop my design based on BeautifulSoup,i planned to
write separate module for each information which i would like to extract
from the website and through the url at it.It has to extract the required
information if available.

Each module tries with pattern matching and returns the result.

I planned to write it in a generic way.I welcome your suggestions.
-- 
Yours,
S.Selvam
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From pfein at pobox.com  Mon May 18 11:11:05 2009
From: pfein at pobox.com (Pete)
Date: Mon, 18 May 2009 10:11:05 -0500
Subject: Concurrency Email List
In-Reply-To: <20090517002621.GA18009@panix.com>
References: <2F8C1929-B58D-4845-A237-EFAEE8BF753D@pobox.com>
	<20090517002621.GA18009@panix.com>
Message-ID: <77516220-6589-4592-9673-9FDC1FE74D31@pobox.com>

On May 16, 2009, at 7:26 PM, Aahz wrote:

> [posted and e-mailed]
>
> On Sat, May 16, 2009, Pete wrote:
>>
>> python-concurrency at googlegroups.com is a new email list for  
>> discussion
>> of concurrency issues in python.  It arose out of Dave Beazley's  
>> class
>> on the subject last week: http://www.dabeaz.com/chicago/concurrent.html
>>
>> The list wills serve as a forum for discussion of such topics as:
>>
>> * threads
>> * multiprocessing
>> * asynchronous
>> * coroutines
>> * the GIL
>>
>> Hope to see you there!  Join at http://groups.google.com/group/python-concurrency/
>
> Is there some reason you chose not to create a list on python.org?   
> I'm
> not joining the list because Google requires that you create a login.

Because it took less time to create the group on Google than it took  
for me to even find the instructions for doing so on python.org (still  
looking).  That said, I'm happy to move if someone would like to point  
me in the right direction/facilitate.


From Wwy58 at yahoo.com  Mon May 18 11:13:58 2009
From: Wwy58 at yahoo.com (David)
Date: Mon, 18 May 2009 08:13:58 -0700 (PDT)
Subject: Python mail truncate problem
References: <4db625fe-158d-4b04-af0b-23e54c3ae22b@e23g2000vbe.googlegroups.com>
	<f14601f3-d8c6-4a6f-af10-7367e35311f8@q14g2000vbn.googlegroups.com>
Message-ID: <38e62c2d-adab-453a-9d57-2438371036a0@s38g2000prg.googlegroups.com>

On May 18, 5:10?am, bieff... at gmail.com wrote:
> On 18 Mag, 05:51, David <Ww... at yahoo.com> wrote:
>
>
>
>
>
> > Hi,
>
> > I am writing Python script to process e-mails in a user's mail
> > account. What I want to do is to update that e-mail's Status to 'R'
> > after processing it, however, the following script truncates old e-
> > mails even though it updates that e-mail's Status correctly. Anybody
> > knows how to fix this?
>
> > Thanks so much.
>
> > ? fp = '/var/spool/mail/' + user
> > ? ? ? ? ? ? ? ? mbox = mailbox.mbox(fp)
>
> > ? ? ? ? ? ? ? ? for key, msg in mbox.iteritems():
> > ? ? ? ? ? ? ? ? ? ? ? ? flags = msg.get_flags()
>
> > ? ? ? ? ? ? ? ? ? ? ? ? if 'R' not in flags:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? # now process the e-mail
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? # now update status
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? msg.add_flag('R' + flags)
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mbox[key] = msg
>
> I have no idea about your problem. However, I believe that ?the last
> statement
> "mbox[key] = msg" is not needed. The objects returned by
> dict.iteritems are not copies but
> the actual ones in the dictionary, so your msg.add_flag() already
> modifies the object in mbox.
>
> HTH
>
> Ciao
> -----
> FB- Hide quoted text -
>
> - Show quoted text -

thanks for your reply. If I delete "mbox[key] = msg", then the actual
files can not be updated for status.


From zutesmog at gmail.com  Mon May 18 11:22:30 2009
From: zutesmog at gmail.com (timh)
Date: Mon, 18 May 2009 08:22:30 -0700 (PDT)
Subject: ? 'in' operator and fallback to __getitem__
Message-ID: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>

Hi

I am trying to understand something about how the 'in' operator (as in
the following expression)

if 'aa' in x:
   do_something()

When trying to implement in support on a class it appears that if
__contains__ doesn't exist
in falls back to calling __getitem__

However strange things happen to the name passed to __getitem__ in the
following example (and in fact in all varients I have triend the name/
key passed to __getitem__ is always the integer 0

For instance

Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class xx(object):
...    def __getitem__(self,name):
...       raise KeyError(name)
...
>>> aa = xx()
>>> aa['kk']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in __getitem__
KeyError: 'kk'
>>> 'kk' in aa
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in __getitem__
KeyError: 0


I am running on ubuntu, and this happens to 2.5.4 as well.  I must say
I am surprised and
am at a loss as to what is actually going on.

Can anyone enlighten me (or should I go and read some 'c' code ;-)

Rgds

Tim


From marco at sferacarta.com  Mon May 18 11:24:02 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Mon, 18 May 2009 17:24:02 +0200
Subject: ? 'in' operator and fallback to __getitem__
In-Reply-To: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>
References: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>
Message-ID: <n4fQl.18513$Ux.1684@tornado.fastwebnet.it>

timh wrote:

> However strange things happen to the name passed to __getitem__ in the
> following example (and in fact in all varients I have triend the name/
> key passed to __getitem__ is always the integer 0

I think it's scanning the container as a sequence and not as a mapping, 
hence the access by index.



From sjmachin at lexicon.net  Mon May 18 11:26:54 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 18 May 2009 15:26:54 +0000 (UTC)
Subject: How can i use Spread Sheet as Data Store
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
Message-ID: <loom.20090518T151856-387@post.gmane.org>

Kalyan Chakravarthy <kalyanchakravarthy <at> hyit.com> writes:

> 
> Hi All,???????????? I have data in Spread Sheet ( First Name and Last Name),
how can i see? this data? in Python code ( how can i use Spread Sheet as Data
Store ) . -- RegardsKalyan

Hi Kalyan,

A few questions ... the answers might help us help you better:

What type of spreadsheet do you have:
.ods (produced by OpenOffice.org's calc)?
.gnumeric?
.xls (MS Excel 2003)?
.xlsx (MS Excel 2007)?
something else?

Do you want to update the spreadsheet using Python, or will that be done
manually? How many rows of data are you likely to have?

What version of Python do you plan to use?

What OS are you using?

Cheers,
John







From aahz at pythoncraft.com  Mon May 18 11:27:44 2009
From: aahz at pythoncraft.com (Aahz)
Date: Mon, 18 May 2009 08:27:44 -0700
Subject: Concurrency Email List
In-Reply-To: <77516220-6589-4592-9673-9FDC1FE74D31@pobox.com>
References: <2F8C1929-B58D-4845-A237-EFAEE8BF753D@pobox.com>
	<20090517002621.GA18009@panix.com>
	<77516220-6589-4592-9673-9FDC1FE74D31@pobox.com>
Message-ID: <20090518152744.GA8435@panix.com>

On Mon, May 18, 2009, Pete wrote:
> On May 16, 2009, at 7:26 PM, Aahz wrote:
>> On Sat, May 16, 2009, Pete wrote:
>>>
>>> python-concurrency at googlegroups.com is a new email list
>>> for discussion of concurrency issues in python.  It arose
>>> out of Dave Beazley's class on the subject last week:
>>> http://www.dabeaz.com/chicago/concurrent.html
>>>
>>> The list wills serve as a forum for discussion of such topics as:
>>>
>>> * threads
>>> * multiprocessing
>>> * asynchronous
>>> * coroutines
>>> * the GIL
>>>
>>> Hope to see you there!  Join at http://groups.google.com/group/python-concurrency/
>>
>> Is there some reason you chose not to create a list on python.org?
>> I'm not joining the list because Google requires that you create a
>> login.
>
> Because it took less time to create the group on Google than it took for 
> me to even find the instructions for doing so on python.org (still  
> looking).  That said, I'm happy to move if someone would like to point  
> me in the right direction/facilitate.

Just send e-mail to postmaster at python.org -- I'll look into making the
instructions clearer/more visible.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From jeff at jmcneil.net  Mon May 18 11:31:44 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Mon, 18 May 2009 08:31:44 -0700 (PDT)
Subject: ? 'in' operator and fallback to __getitem__
References: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>
Message-ID: <973a4430-18df-490b-a65d-f906bd74a691@r13g2000vbr.googlegroups.com>

On May 18, 11:22?am, timh <zutes... at gmail.com> wrote:
> Hi
>
> I am trying to understand something about how the 'in' operator (as in
> the following expression)
>
> if 'aa' in x:
> ? ?do_something()
>
> When trying to implement in support on a class it appears that if
> __contains__ doesn't exist
> in falls back to calling __getitem__
>
> However strange things happen to the name passed to __getitem__ in the
> following example (and in fact in all varients I have triend the name/
> key passed to __getitem__ is always the integer 0
>
> For instance
>
> Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
> [GCC 4.3.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> class xx(object):
>
> ... ? ?def __getitem__(self,name):
> ... ? ? ? raise KeyError(name)
> ...>>> aa = xx()
> >>> aa['kk']
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> ? File "<stdin>", line 3, in __getitem__
> KeyError: 'kk'>>> 'kk' in aa
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> ? File "<stdin>", line 3, in __getitem__
> KeyError: 0
>
> I am running on ubuntu, and this happens to 2.5.4 as well. ?I must say
> I am surprised and
> am at a loss as to what is actually going on.
>
> Can anyone enlighten me (or should I go and read some 'c' code ;-)
>
> Rgds
>
> Tim

See http://docs.python.org/library/functions.html#iter, that ought to
clear it up.

Thanks,

Jeff
mcjeff.blogspot.com


From zutesmog at gmail.com  Mon May 18 11:31:53 2009
From: zutesmog at gmail.com (Tim Hoffman)
Date: Mon, 18 May 2009 08:31:53 -0700 (PDT)
Subject: ? 'in' operator and fallback to __getitem__
References: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>
	<n4fQl.18513$Ux.1684@tornado.fastwebnet.it>
Message-ID: <d40e1713-42f0-4b34-9562-ca07cc91c8e4@r31g2000prh.googlegroups.com>

Hi Marco

Thats definately what I think is happening.

I tried the following

>>> class yy(object):
...   def __getitem__(self,name):
...     raise KeyError(name)
...   def __contains__(self,name):
...     raise KeyError(name)
...
>>> aa = yy()
>>> 'll' in aa
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "<stdin>", line 5, in __contains__
KeyError: 'll'
>>> [i in aa]
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
NameError: name 'i' is not defined
>>> [i for i in aa]
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "<stdin>", line 3, in __getitem__
KeyError: 0
>>>


Which suggests to me there must be some sort of order of precedence
between __contains__ and __getitem__
and 'for' statement must change the order in some manner.

Thanks for the reply


T

On May 18, 11:24?pm, Marco Mariani <ma... at sferacarta.com> wrote:
> timh wrote:
> > However strange things happen to the name passed to __getitem__ in the
> > following example (and in fact in all varients I have triend the name/
> > key passed to __getitem__ is always the integer 0
>
> I think it's scanning the container as a sequence and not as a mapping,
> hence the access by index.



From urbangabo at gmail.com  Mon May 18 11:52:43 2009
From: urbangabo at gmail.com (Gabor Urban)
Date: Mon, 18 May 2009 17:52:43 +0200
Subject: Seeking old post on developers who like IDEs vs developers who 
	like simple languages
Message-ID: <f7ac28aa0905180852h36801930tb6b8be085f0aa33d@mail.gmail.com>

Hi guys,

I think this issue is long-long displute over tools and IDE-s. No need
to combine it with the question of the complexity of the programming
language used.

I know guys, who did every development project using a simple GVIM and
command line tools, and vere extremly productive. Even in Java, C++,
and any other languages. For myself I can say, I am a seasoned Emacs
user, and would not switch to any fancy IDE. BUT that is personal
view.

IMHO this question does not bellong here, though I was very pleased to
read arguments instead of flames.... :-))

Gabor
-- 
Linux: Choice of a GNU Generation


From jonathan.cervidae at gmail.com  Mon May 18 11:55:10 2009
From: jonathan.cervidae at gmail.com (jcervidae)
Date: Mon, 18 May 2009 08:55:10 -0700 (PDT)
Subject: pydb output vanishes when running nosetests doctests
Message-ID: <10e2b00d-f9da-4606-a809-d841905c8915@v17g2000vbb.googlegroups.com>

Hi Pythonistas:

When pydb.debugger() is launched from within my code or for some other
reason pydb starts from inside a nosetests or doctest, I do not see
any output from it. It appears the test has hung but it hasn't. If I
type commands pydb obeys them I just can't see the results. How can I
stop this? It means I have to make minor little programs to re-create
problems the tests were designed to catch in order to debug.


From david_v_wright at yahoo.com  Mon May 18 12:45:01 2009
From: david_v_wright at yahoo.com (david wright)
Date: Mon, 18 May 2009 09:45:01 -0700 (PDT)
Subject: Python code-bloat tool-- warning n00b stuff...
In-Reply-To: <gung8f$q2s$1@ger.gmane.org>
References: <1a3a139e0905161013p2ff1c024l260ad57433e1be20@mail.gmail.com>
	<gung8f$q2s$1@ger.gmane.org>
Message-ID: <147293.52806.qm@web31807.mail.mud.yahoo.com>


----- Original Message ----

From: Robert Kern <robert.kern at gmail.com>
To: python-list at python.org
Sent: Saturday, May 16, 2009 3:55:11 PM
Subject: Re: Python code-bloat tool-- warning n00b stuff...

On 2009-05-16 12:13, anand j wrote:
> Hi,
>      I am looking for a bunch of rules or a tool that takes the code for
> my python class and checks the amount of code bloat and points out where
> i can improve. I am a n00b to python and built an application linking
> wordnet and graph packages. but somehow have this nagging feeling my
> code is too bloated with too many functions..... might just be paranoia
> , but worth an investigation i guess.....
> 
> Sorry if this is a repeat/trivial question, I could not find any
> comprehensive links on google or the mailing list archive that is within
> my gmail. Currently, trying to download the other archives and index
> using whoosh and try searching it.

A slightly more interesting and nontrivial metric that you can apply is cyclomatic complexity. Basically, it is the number of independent code paths your each function may go down.

http://en.wikipedia.org/wiki/Cyclomatic_complexity
http://www.traceback.org/2008/03/31/measuring-cyclomatic-complexity-of-python-code/

This will give a not-too-unreasonable measure of how complicated each function is. I don't know if that's what you are getting at with the term "code bloat".


---


I would suggest looking into TDD (test driven development). 

This technique would be a good fit to eliminate you feeling of code bloat, in TDD you only write the necessary amount
of code to make your test pass, hence you never write code that is not going to be utilized. 

It takes a little while to get used to this technique ( also, it can be much more difficult to apply in some situations) but it's well worth the effort. :). You'll have no trouble finding tons of resources for this topic.


From norseman at hughes.net  Mon May 18 12:51:47 2009
From: norseman at hughes.net (norseman)
Date: Mon, 18 May 2009 09:51:47 -0700
Subject: Just wondering
In-Reply-To: <4A0E00C0.7090908@ieee.org>
References: <mailman.188.1242388571.8015.python-list@python.org>	<Q6dPl.15964$Ux.11735@tornado.fastwebnet.it>
	<4A0DDCA8.3020806@hughes.net> <4A0E00C0.7090908@ieee.org>
Message-ID: <4A119223.7070903@hughes.net>

Dave Angel wrote:
> norseman wrote:
>> <div class="moz-text-flowed" style="font-family: -moz-fixed">Marco 
>> Mariani wrote:
>>> Gediminas Kregzde wrote:
>>>
>>>
>>>> def doit(i):
>>>>    pass
>>>>
>>>> def main():
>>>>    a = [0] * 10000000
>>>>    t = time()
>>>>    map(doit, a)
>>>>    print "map time: " + str(time() - t)
>>>
>>> Here you are calling a function ten million times, build a list with 
>>> of ten million None results, then throw it away.
>>>
>>>
>>>> def main2():
>>>>    t = time()
>>>>    a = [0] * 10000000
>>>>    for i in a:
>>>>        pass
>>>>    print "loop time: " + str(time() - t)
>>>
>>> Here you do nothing but iterating 'i' over the 'a' list.
>>>
>>>
>>>> main()  # takes approximately 5x times longer than main2()
>>>> main2()
>>>>
>>>> I'm wondering were is catch?
>>>
>>> Function calls are not free in python. They cost a lot more than they 
>>> do in C, Delphi or other languages.
>>>
>>
>> Gediminas - You did a good job of testing the overhead.  All good 
>> programmers do that!
>>
>> Steve
>>
>>
> If the task is to test the overhead, then the two loops need to be 
> equivalent.

no they don't. see below

   The OP's conclusion, confirmed by many of you, is that
> map() is lots slower than for.  

is it? see below

But if you add in the call overhead in
> the for loop, they come out within 2 percent.  If you just want to 
> compare map() time to for time, use functions:
> 
> from time import time
> def doit(i):
>   pass
> def main():
>   a = [0] * 10000000
>   t = time()
>   map(doit, a)
>   print "map time: " + str(time() - t)
> 
> def main2():
>   a = [0] * 10000000
>   t = time()
>   for i in a:
>       doit(i)
>   print "loop time: " + str(time() - t)
> 
> 
> main()
> main2()
> 
> gives:
> map time: 4.875
> loop time: 4.79600000381
> 
> 
================================================
Why do tests have to be equal?  If what you are after is to test several 
things just to see what they carry for overhead just do so.  Whether or 
not they are "equal" is a matter of choice.  Doing the map() implies it 
will store something. Doing the loop tells what it takes to loop. THEN, 
by adding your code to each to balance things out and running for time 
will tell you things.  Maybe map() will win and maybe it will not for 
certain objectives. Maybe loop will win under certain conditions. 
Without a baseline and testing - any statement as to which is better is 
simply unrealistic nonsense.  The 'internals', algorithms, can often be 
optimized after inspection to obtain better results.  Whether or not 
these optimizations will interfere with a another function (in this case 
map() ) remains to be tested.  Just because the minimal overhead on A is 
less than B does not mean that A is the better choice for a given situation.

By the way, since any loop action actually needs some sort of counter, 
be it the here to end of file or a numeric countdown, I put my timer 
before def main? and check the whole test of minimal parts.  People who 
write compilers and/or interpreters often do strange things with 
optimization concepts.

Dave's' times point out that loop has a good chance to win if the rest 
of that sections code were present. By that I mean the actual function 
the loop or map() were to preform in a given setting.  It shows the 
function call is expensive.  Thus in-line code can be a better choice 
when speed is needed. At least in Python and given the results of both 
tests of loop above.

Also depicted is that map() requires the expensive function call and 
loop does not in order to process something.



the def doit(i):
   pass
should result in something like:

.
.
push data_address in R2
call address_of_doit
.
.


address_of_doit
pop data_address to R1              #see note 1
return                              #see note 2



note 1:  not all OS/architectures  implement push/pop
          whatever the store/call  retrieve/(store)/return  may be,
          it will be the same throughout for that OS/machine.

note 2:  a call to a dummy will show the efficiency of calling.
          normally - its overhead is quite minimal.  As another stated
          above - such things are indeed expensive in Python.




All this generated by someone posting a simple overhead test.  WOW.
I guess I had a better teacher than I thought. :)


IMHO - Dave's loop test should have been included in the original 
posting. Making three tests all together at that time.  But then we all 
had different teachers.  Which is why the question came up.


Steve


From 89dragon at gmail.com  Mon May 18 12:58:17 2009
From: 89dragon at gmail.com (Chris Hughes)
Date: Mon, 18 May 2009 09:58:17 -0700
Subject: Fedora root access with python
Message-ID: <4A1193A9.3070506@gmail.com>

I've written some software for ubuntu/debian linux and am porting it 
over to RPM-based distros and have relied heavily on gksu being called 
internally to perform root tasks with a graphical password. However 
fedora seems to have another system of authenticating root access, how 
do I do that graphically via an internal command line or through python?

http://www.gtk-apps.org/content/show.php/Wacom+Control+Panel?content=104309


From gunterhenriksen at gmail.com  Mon May 18 13:14:31 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Mon, 18 May 2009 10:14:31 -0700
Subject: Context manager, atexit processing, and PEP 3143 
	DaemonContext.close
In-Reply-To: <87hbzk8eoh.fsf@benfinney.id.au>
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>
	<87hbzk8eoh.fsf@benfinney.id.au>
Message-ID: <ab4fa3490905181014v11bb0746p2f81f3a00dac9b8a@mail.gmail.com>

> Anyone else?

If there is a function which triggers a one-shot switch, I
like to have a way to find out if it has already been triggered,
I prefer to have the function tell me if it triggered the switch
or not, but I would not want that to be by raising an exception.


From jeff at jmcneil.net  Mon May 18 13:15:19 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Mon, 18 May 2009 10:15:19 -0700 (PDT)
Subject: ? 'in' operator and fallback to __getitem__
References: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>
	<n4fQl.18513$Ux.1684@tornado.fastwebnet.it>
	<d40e1713-42f0-4b34-9562-ca07cc91c8e4@r31g2000prh.googlegroups.com>
Message-ID: <f0d15382-b81f-4008-8426-44b739ee8300@z7g2000vbh.googlegroups.com>

On May 18, 11:31?am, Tim Hoffman <zutes... at gmail.com> wrote:
> Hi Marco
>
> Thats definately what I think is happening.
>
> I tried the following
>
> >>> class yy(object):
>
> ... ? def __getitem__(self,name):
> ... ? ? raise KeyError(name)
> ... ? def __contains__(self,name):
> ... ? ? raise KeyError(name)
> ...>>> aa = yy()
> >>> 'll' in aa
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in ?
> ? File "<stdin>", line 5, in __contains__
> KeyError: 'll'>>> [i in aa]
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in ?
> NameError: name 'i' is not defined>>> [i for i in aa]
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in ?
> ? File "<stdin>", line 3, in __getitem__
> KeyError: 0
>
>
>
> Which suggests to me there must be some sort of order of precedence
> between __contains__ and __getitem__
> and 'for' statement must change the order in some manner.
>
> Thanks for the reply
>
> T
>
> On May 18, 11:24?pm, Marco Mariani <ma... at sferacarta.com> wrote:
>
> > timh wrote:
> > > However strange things happen to the name passed to __getitem__ in the
> > > following example (and in fact in all varients I have triend the name/
> > > key passed to __getitem__ is always the integer 0
>
> > I think it's scanning the container as a sequence and not as a mapping,
> > hence the access by index.
>
>

Whoops, I just realized I posted the wrong link...

http://docs.python.org/reference/expressions.html#in

Jeff


From jdoe at usenetlove.invalid  Mon May 18 13:23:24 2009
From: jdoe at usenetlove.invalid (John Doe)
Date: Mon, 18 May 2009 17:23:24 GMT
Subject: The ultimate in voice-powered scripting in Windows... need help
Message-ID: <gQgQl.29479$yr3.25296@nlpi068.nbdc.sbc.com>


http://code.google.com/p/dragonfly/

The help I need probably requires a Python programmer to become 
familiar with the project. I cannot tell exactly how much syntax versus 
logic is involved. But if you have ever had any interest in 
voice/speech activated system wide scripting in Windows, this Dragonfly 
is the tool. The upcoming big difference in speech powered scripting 
included in Dragonfly is the advent of continuous command recognition 
also known as "command sequences". Now a user will be able to make a 
vocabulary of words, and string them together in any order to make 
phrases, for computer command and control that is similar to a human 
language.

Specifically.

I need a comprehensive example command module for Dragonfly.

Apparently, continuous command recognition (command sequences) do not 
work outside of the (_multiedit.py) command module file.

I could use the help of some Dragonfly interested Python programmer who 
will include a program/window specific script inside of (_multiedit.py) 
as an example that I can duplicate inside of that same file for other 
window specific scripts.

My goal is to enable hacker-accessible global and window specific 
scripting for Dragon Naturally Speaking, taking advantage of 
Dragonfly's ability to do continuous command recognition and including 
all of Dragonfly's basic scripting functions (as apparently 
_multiedit.py does). So far, I have figured out how to do most of it, 
with that important exception.

Thanks.



By the way. My gung-ho interest in Dragonfly is strictly personal. I 
shill for no one.



-- 
Interested in making Windows and games obey your verbal commands? 
Continuous command recognition (much easier than speech recognition) 
can now be enabled using Naturally Speaking and freeware Dragonfly. 
See (comp.lang.beta) for discussion.


From deets at nospam.web.de  Mon May 18 13:35:52 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 18 May 2009 19:35:52 +0200
Subject: pydb output vanishes when running nosetests doctests
References: <10e2b00d-f9da-4606-a809-d841905c8915@v17g2000vbb.googlegroups.com>
Message-ID: <77dkfoF1ggn85U1@mid.uni-berlin.de>

jcervidae wrote:

> Hi Pythonistas:
> 
> When pydb.debugger() is launched from within my code or for some other
> reason pydb starts from inside a nosetests or doctest, I do not see
> any output from it. It appears the test has hung but it hasn't. If I
> type commands pydb obeys them I just can't see the results. How can I
> stop this? It means I have to make minor little programs to re-create
> problems the tests were designed to catch in order to debug.

Use the "-s"-option which prevents nose from capturing the stdout and not
printing it immediately.

Diez


From google at mrabarnett.plus.com  Mon May 18 13:43:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 18 May 2009 18:43:59 +0100
Subject: Context manager, atexit processing,
	and PEP 3143 	DaemonContext.close
In-Reply-To: <ab4fa3490905181014v11bb0746p2f81f3a00dac9b8a@mail.gmail.com>
References: <87bppsa6y8.fsf@benfinney.id.au>	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>	<87tz3k8lfc.fsf@benfinney.id.au>	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>	<87hbzk8eoh.fsf@benfinney.id.au>
	<ab4fa3490905181014v11bb0746p2f81f3a00dac9b8a@mail.gmail.com>
Message-ID: <4A119E5F.6010304@mrabarnett.plus.com>

Gunter Henriksen wrote:
>> Anyone else?
> 
> If there is a function which triggers a one-shot switch, I
> like to have a way to find out if it has already been triggered,
> I prefer to have the function tell me if it triggered the switch
> or not, but I would not want that to be by raising an exception.

The 'file' class also has a 'closed' method, so that's a good model to
follow.


From phd at phd.pp.ru  Mon May 18 14:12:24 2009
From: phd at phd.pp.ru (Oleg Broytmann)
Date: Mon, 18 May 2009 22:12:24 +0400
Subject: SQLObject 0.9.11
Message-ID: <20090518181224.GB13292@phd.pp.ru>

Hello!

I'm pleased to announce version 0.9.11, a minor bugfix release of 0.9 branch
of SQLObject.


What is SQLObject
=================

SQLObject is an object-relational mapper.  Your database tables are described
as classes, and rows are instances of those classes.  SQLObject is meant to be
easy to use and quick to get started with.

SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).


Where is SQLObject
==================

Site:
http://sqlobject.org

Development:
http://sqlobject.org/devel/

Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss

Archives:
http://news.gmane.org/gmane.comp.python.sqlobject

Download:
http://cheeseshop.python.org/pypi/SQLObject/0.9.11

News and changes:
http://sqlobject.org/News.html


What's New
==========

News since 0.9.10
----------------

* Two bugs in SQLiteConnection.columnsFromSchema() were fixed: use
  sqlmeta.idName instead of 'id'; convert default 'NULL' to None.

* Use sqlmeta.idName instead of 'id' in all connection classes.

* Fixed a bug that prevented to override per class _connection if there is
  sqlhub.processConnection.

For a more complete list, please see the news:
http://sqlobject.org/News.html

Oleg.
-- 
     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.


From phd at phd.pp.ru  Mon May 18 14:14:24 2009
From: phd at phd.pp.ru (Oleg Broytmann)
Date: Mon, 18 May 2009 22:14:24 +0400
Subject: SQLObject 0.10.6
Message-ID: <20090518181424.GF13292@phd.pp.ru>

Hello!

I'm pleased to announce version 0.10.6, a minor bugfix release of 0.10 branch
of SQLObject.


What is SQLObject
=================

SQLObject is an object-relational mapper.  Your database tables are described
as classes, and rows are instances of those classes.  SQLObject is meant to be
easy to use and quick to get started with.

SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).


Where is SQLObject
==================

Site:
http://sqlobject.org

Development:
http://sqlobject.org/devel/

Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss

Archives:
http://news.gmane.org/gmane.comp.python.sqlobject

Download:
http://cheeseshop.python.org/pypi/SQLObject/0.10.6

News and changes:
http://sqlobject.org/News.html


What's New
==========

News since 0.10.5
-----------------

* Better support for Python 2.6: do not import the deprecated sets module.

* Two bugs in SQLiteConnection.columnsFromSchema() were fixed: use
  sqlmeta.idName instead of 'id'; convert default 'NULL' to None.

* Use sqlmeta.idName instead of 'id' in all connection classes.

* Fixed a bug that prevented to override per class _connection if there is
  sqlhub.processConnection.

For a more complete list, please see the news:
http://sqlobject.org/News.html

Oleg.
-- 
     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.


From bigblueswope at gmail.com  Mon May 18 14:20:51 2009
From: bigblueswope at gmail.com (BJ Swope)
Date: Mon, 18 May 2009 14:20:51 -0400
Subject: How to get Exif data from a jpeg file
In-Reply-To: <m2octsnny5.fsf@googlemail.com>
References: <m263g1pbl7.fsf@googlemail.com>
	<mailman.265.1242504138.8015.python-list@python.org>
	<m2octsnny5.fsf@googlemail.com>
Message-ID: <fca207170905181120m3b87d332l4aaf2431e3f9e69c@mail.gmail.com>

On Sun, May 17, 2009 at 4:17 AM, Arnaud Delobelle
<arnodel at googlemail.com> wrote:
>
> Daniel Fetchinson <fetchinson at googlemail.com> writes:
>
> >> I need to get the creation date from a jpeg file in Python. ?Googling
> >> brought up a several references to apparently defunct modules. ?The best
> >> way I have been able to find so far is something like this:
> >>
> >> from PIL import Image
> >> img = Image.open('img.jpg')
> >> exif_data = img._getexif()
> >> creation_date = exif_data[36867]
> >>
> >> Where 36867 is the exif tag for the creation date data (which I found by
> >> ooking at PIL.ExifTags.TAGS). ?But this doesn't even seem to be
> >> documented in the PIL docs. ?Is there a more natural way to do this?
> >
> >
> > Have you tried http://sourceforge.net/projects/exif-py/ ?
> >
> > HTH,
> > Daniel
>
> I will have a look - thank you.
>
> --
> Arnaud
> --
> http://mail.python.org/mailman/listinfo/python-list


I use the EXIF module to do bulk renames of all the pictures in a directory.

Here's my hackeration...



import sys
import os
import re
import time
import win32file
import datetime
import EXIF

DATE_FORMAT?? = '%Y%m%d_%H%M%S'
allowed_files = ['.asf', '.jpg', '.mod', '.mov', '.mpeg', '.mpg',
'.jpeg', '.png', '.tiff', '.tif']
named_files = []

r = re.compile('.mod',)

def is_a_file(path, file, xtn):
??? """
??? We only want to rename the files right?
??? Return True or False depending on whether object is a file or a directory
??? """

??? if os.path.isdir(os.path.join(path,file)):
??????? print "This is a directory not a file.? Will not rename!"
??????? return False
??? if allowed_files.count(xtn):
??????? return True
??? else:
??????? print file, "is not a in the list of allowed extensions. Will
not rename!"
??????? return False


def renameFile(path, file):
??? """ Rename <old_filename> with the using the date/time created or
modified for the new file name"""

??? old_filename = os.path.join(path,file)

??? (name,xtn) = os.path.splitext(file)
??? xtn = xtn.lower()

??? if re.search(r, xtn):
??????? xtn_old = xtn
??????? xtn = '.mpg'
??????? print xtn_old, 'changed to', xtn

??? if is_a_file(path, file, xtn):
??????? created_time = os.path.getctime(old_filename)
??????? modify_time = os.path.getmtime(old_filename)

??????? f = open(old_filename, 'rb')
??????? try:
??????????? tags=EXIF.process_file(f)
??????? except UnboundLocalError:
??????????? print "No EXIF data available for ", file
??????????? tags = {}
??????????? exif_time = 0
??????? try:
??????????? tags['EXIF DateTimeOriginal']
??????????? exif_time = str(tags['EXIF DateTimeOriginal'])
??????????? exif_time = int(time.mktime(time.strptime(exif_time,
"%Y:%m:%d %H:%M:%S")))
??????? except (KeyError,ValueError):
??????????? print 'No EXIF DateTimeOriginal for ', file
??????????? exif_time = 0
??????? f.close()

??????? if created_time < modify_time:
??????????? local_time = time.localtime(created_time)
??????? else:
??????????? local_time = time.localtime(modify_time)

??????? if exif_time:
??????????? if exif_time < local_time:
??????????????? local_time = time.localtime(exif_time)

??????? date_time_name = time.strftime(DATE_FORMAT, local_time)

??????? copy_number = named_files.count(date_time_name)
??????? named_files.append(date_time_name)

??????? new_name = date_time_name + "_" + str(copy_number) + xtn

??????? new_filename = os.path.join(path, new_name)

??????? print 'Renaming:', old_filename, 'to', new_filename
??????? #print 'Created Time? = ', created_time
??????? #print 'Modified Time = ', modify_time
??????? #print 'EXIF Time???? = ', exif_time
??????? #print 'Time Used???? = ', local_time
??????? os.rename(old_filename, new_filename)


if __name__ == '__main__':
??? if os.path.isdir(sys.argv[1]):
??????? """Recursively walk the directory listed as Arg 1 and work each file."""
??????? print
??????? for path,dirs,files in os.walk(sys.argv[1]):
??????????? for file in files:
??????????????? renameFile(path, file)
??? else:
??????? print "\nNo path to rename specified.\n"
??????? print "Usage:\n\tpython", sys.argv[0], "<path to directory of
source files>"
??????? sys.exit(1)




--
We are all slave to our own paradigm. -- Joshua Williams

If the letters PhD appear after a person's name, that person will
remain outdoors even after it's started raining. -- Jeff Kay

Fascism is a term used to describe authoritarian nationalist political
ideologies or mass movements that are concerned with notions of
cultural decline or decadence and seek to achieve a millenarian
national rebirth by exalting the nation or race, and promoting cults
of unity, strength and purity. - Wikipedia

The story of postwar American conservatism is best understood as a
continual replay of a single long-standing debate. On one side are
those who have upheld the Burkean ideal of replenishing civil society
by adjusting to changing conditions. On the other are those committed
to a revanchist counterrevolution, the restoration of America's
pre-welfare state ancien regime. And, time and again, the
counterrevolutionaries have won. The result is that modern American
conservatism has dedicated itself not to fortifying and replenishing
civil society but rather to weakening it through a politics of civil
warfare. -- Sam Tanenhaus


From george.sakkis at gmail.com  Mon May 18 14:58:45 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Mon, 18 May 2009 11:58:45 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
Message-ID: <c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com>

On May 18, 5:27?am, jer... at martinfamily.freeserve.co.uk wrote:

> My suggestion is primarily about using multiple threads and sharing
> memory - something akin to the OpenMP directives that one of you has
> mentioned. To do this efficiently would involve removing the Global
> Interpreter Lock, or switching to Jython or Iron Python as you
> mentioned.
>
> However I *do* actually want to add syntax to the language.

Good luck with that. The GIL is not going away any time soon (or
probably ever) and as long as CPython is the "official"
implementation, there are almost zero chances of adding syntax support
for this. Besides, Guido and other py-devs are not particularly keen
on threads as a parallelization mechanism.

George


From tjreedy at udel.edu  Mon May 18 15:12:50 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 18 May 2009 15:12:50 -0400
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
Message-ID: <gusbvf$s24$1@ger.gmane.org>

Kalyan Chakravarthy wrote:
> Hi All,
>              I have data in Spread Sheet ( First Name and Last Name), 
> how can i see  this data  in Python code ( how can i use Spread Sheet as 
> Data Store ) .

I you have a choice, a plain text file is MUCH easier.

Or, you can output a plain text data.csv (comma-separated variable) file 
from the spreadsheet and read that with the csv module.



From tjreedy at udel.edu  Mon May 18 15:20:29 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 18 May 2009 15:20:29 -0400
Subject: ? 'in' operator and fallback to __getitem__
In-Reply-To: <d40e1713-42f0-4b34-9562-ca07cc91c8e4@r31g2000prh.googlegroups.com>
References: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>	<n4fQl.18513$Ux.1684@tornado.fastwebnet.it>
	<d40e1713-42f0-4b34-9562-ca07cc91c8e4@r31g2000prh.googlegroups.com>
Message-ID: <guscdq$s24$2@ger.gmane.org>

Tim Hoffman wrote:

>>>> [i for i in aa]
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
>   File "<stdin>", line 3, in __getitem__
> KeyError: 0
> 
> 
> Which suggests to me there must be some sort of order of precedence
> between __contains__ and __getitem__
> and 'for' statement must change the order in some manner.

The 'in' part of for statements has nothing to do with the 'in' 
comparison operator.  For loops first look for .__iter__ and .__next__ 
and fall back to .__getitem__.



From laurentluce49 at yahoo.com  Mon May 18 15:30:28 2009
From: laurentluce49 at yahoo.com (Laurent Luce)
Date: Mon, 18 May 2009 12:30:28 -0700 (PDT)
Subject: strip char from list of strings
Message-ID: <195055.64779.qm@web54204.mail.re2.yahoo.com>


I have the following list:

[ 'test\n', test2\n', 'test3\n' ]

I want to remove the '\n' from each string in place, what is the most efficient way to do that ?

Regards,

Laurent


From sverreodegard at gmail.com  Mon May 18 15:52:52 2009
From: sverreodegard at gmail.com (Sverre)
Date: Mon, 18 May 2009 12:52:52 -0700 (PDT)
Subject: Package problem
Message-ID: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>

I'm using Ubuntu and some of the packages in the repository are too
old. So I got the thought to remove nearly  all packages downloaded
from the repository and install them with easy_install. Is this a way
to go without greater problems?


From socyl at 987jk.com.invalid  Mon May 18 16:04:08 2009
From: socyl at 987jk.com.invalid (kj)
Date: Mon, 18 May 2009 20:04:08 +0000 (UTC)
Subject: Advanced Python books?
Message-ID: <gusevn$jjd$1@reader1.panix.com>



I have read a couple of "learn Python"-type books, and now I'm
looking for some more advanced books on Python, something analogous
to "Effective Java" or "High-Order Perl".  I've only been able to
find "Advanced Python 3 Programming Techniques", which, as far as
I can tell, is only available as a "Kindle Book".  (Since I won't
be buying a Kindle for another few decades, this is not an option
for me.)

I tried out "Dive into Python", because I was told that it was
written for people with prior programming experience.  It's an OK
book, but I don't find that it is much more advanced than pretty
much any other "learn Python" book I've seen.

Basically I'm looking for a book that assumes that one has the
basics of the language down, and instead focuses on standard problems
of software development, such as application architecture and
design, prototyping, debugging, profiling and performance-tuning,
testing, packaging/distribution, extending/embedding, threading
and IPC, persistence, etc., and on various prototypical cases such
as command-line utilities, GUI-apps, webapps, database-backed apps,
simulations, etc.

Granted, it is unlikely that a single book will do justice to all
these areas, but these are the topics I'm now interested in, from
the perspective of Python.

Any suggestions?

TIA!
-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.


From tjreedy at udel.edu  Mon May 18 16:07:26 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 18 May 2009 16:07:26 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com>
Message-ID: <gusf5s$9bu$1@ger.gmane.org>

George Sakkis wrote:
> On May 18, 5:27 am, jer... at martinfamily.freeserve.co.uk wrote:
> 
>> My suggestion is primarily about using multiple threads and sharing
>> memory - something akin to the OpenMP directives that one of you has
>> mentioned. To do this efficiently would involve removing the Global
>> Interpreter Lock, or switching to Jython or Iron Python as you
>> mentioned.
>>
>> However I *do* actually want to add syntax to the language.

I can understand you having a preference, but you may have to choose 
between fighting over that method or achieving results.  I agree with ...
> Good luck with that. The GIL is not going away any time soon (or
> probably ever) and as long as CPython is the "official"
> implementation, there are almost zero chances of adding syntax support
> for this. Besides, Guido and other py-devs are not particularly keen
> on threads as a parallelization mechanism.

Parallel processes can run on multiple processors as well as multiple 
cores within a processor.  Some problems, like massive search, require 
multiple disks (or memories, or IO ports) as well as multiple processing 
units.  There is debate over how useful massively multicore processors 
will actually be and for which types of problems.

tjr



From UrsusMaximus at gmail.com  Mon May 18 16:12:49 2009
From: UrsusMaximus at gmail.com (UrsusMaximus at gmail.com)
Date: Mon, 18 May 2009 13:12:49 -0700 (PDT)
Subject: Advanced Python books?
References: <gusevn$jjd$1@reader1.panix.com>
Message-ID: <9e2f3765-9ca6-4269-9b11-c75c8cd3ff9a@k9g2000pra.googlegroups.com>

You might try Expert Python Programming by Tarek Ziad?. It is a
relatively recent book aimed at "experts". There are several reviews
of the book linked to from <a href="http://www.awaretek.com/
book.html">this page</a>.

Ron


On May 18, 1:04?pm, kj <so... at 987jk.com.invalid> wrote:
> I have read a couple of "learn Python"-type books, and now I'm
> looking for some more advanced books on Python, something analogous
> to "Effective Java" or "High-Order Perl". ?I've only been able to
> find "Advanced Python 3 Programming Techniques", which, as far as
> I can tell, is only available as a "Kindle Book". ?(Since I won't
> be buying a Kindle for another few decades, this is not an option
> for me.)
>
> I tried out "Dive into Python", because I was told that it was
> written for people with prior programming experience. ?It's an OK
> book, but I don't find that it is much more advanced than pretty
> much any other "learn Python" book I've seen.
>
> Basically I'm looking for a book that assumes that one has the
> basics of the language down, and instead focuses on standard problems
> of software development, such as application architecture and
> design, prototyping, debugging, profiling and performance-tuning,
> testing, packaging/distribution, extending/embedding, threading
> and IPC, persistence, etc., and on various prototypical cases such
> as command-line utilities, GUI-apps, webapps, database-backed apps,
> simulations, etc.
>
> Granted, it is unlikely that a single book will do justice to all
> these areas, but these are the topics I'm now interested in, from
> the perspective of Python.
>
> Any suggestions?
>
> TIA!
> --
> NOTE: In my address everything before the first period is backwards;
> and the last period, and everything after it, should be discarded.



From python at bdurham.com  Mon May 18 16:22:42 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 18 May 2009 16:22:42 -0400
Subject: Advanced Python books?
In-Reply-To: <gusevn$jjd$1@reader1.panix.com>
References: <gusevn$jjd$1@reader1.panix.com>
Message-ID: <1242678162.16562.1316079797@webmail.messagingengine.com>

Take a look at "Text Processing In Python" by David Mertz. This book
doesn't cover all your requirements, but its a well-written book that is
more comprehensive than its title might indicate.

There's also a free version of this book online.

Malcolm


From notontheweb at noisp.com  Mon May 18 16:27:40 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Mon, 18 May 2009 13:27:40 -0700
Subject: Which C compiler?
In-Reply-To: <4a11092f$0$30903$9b622d9e@news.freenet.de>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>
	<4a11092f$0$30903$9b622d9e@news.freenet.de>
Message-ID: <1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>

Martin v. L?wis wrote:
> Jive Dadson wrote:
>> I am using Python 2.4.  I need to make a native Python extension for
>> Windows XP.  I have both VC++ 6.0 and Visual C++ 2005 Express Edition.
>> Will VC++ 6.0 do the trick?  That would be easier for me, because the
>> project is written for that one.  If not, will the 2005 compiler do it?
> 
> In general, to build extension modules, you need to use the same VC
> version as the one that was used to build Python. For 2.4, that would
> be Visual Studio 2003. So if you use VC 6, VS 2005, or VS 2008, you
> may run into problems.
> 
> Depending on what exactly the extension module does, it might work
> fine also.
> 
> Regards,
> Martin

Thanks.  I think I might just use some variety of Popen instead.  I 
don't need much communication between the C++ application and Python, 
and it's not time-critical.  I cannot get flush() to work on the Python 
side of the pipe however I try.  That seems to be a common complaint. 
But I can work around it.

I love Python, but the update regimen is very frustrating.  It's a 
misery to me why every major release requires new versions of so much 
application stuff.  No other software that I use is like that.  When I 
upgrade Windoze, I do not have to get new matching versions of all my 
editors, browsers, and whatnot.  But Python makes me do that, and that's 
why I am stuck on release 2.4.  Even the pure Python stuff needs to be 
copied from one "site-packages" to another.  Then I have to figure out 
why it won't work.  I have fought my way through the upgrade path twice, 
and I just can't face it again.

Thus endeth the rant.


From a.cavallo at cavallinux.eu  Mon May 18 16:34:17 2009
From: a.cavallo at cavallinux.eu (A. Cavallo)
Date: Mon, 18 May 2009 21:34:17 +0100
Subject: Package problem
In-Reply-To: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
Message-ID: <200905182134.18454.a.cavallo@cavallinux.eu>

On Monday 18 May 2009 20:52:52 Sverre wrote:
> I'm using Ubuntu and some of the packages in the repository are too
> old. So I got the thought to remove nearly  all packages downloaded
> from the repository and install them with easy_install. Is this a way
> to go without greater problems?

If you're installing as root probably this will cause a dependency nightmare.

Installing any file in the filesystem without using a package manager 
(deb/rpm) will garantee these files will be overwritten on the next 
update/upgrade (it can be triggered also by another package).

Regards,
Antonio


From jeremy at martinfamily.freeserve.co.uk  Mon May 18 16:52:12 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Mon, 18 May 2009 13:52:12 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com>
Message-ID: <ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com>

On 18 May, 19:58, George Sakkis <george.sak... at gmail.com> wrote:
> On May 18, 5:27?am, jer... at martinfamily.freeserve.co.uk wrote:
>
> > My suggestion is primarily about using multiple threads and sharing
> > memory - something akin to the OpenMP directives that one of you has
> > mentioned. To do this efficiently would involve removing the Global
> > Interpreter Lock, or switching to Jython or Iron Python as you
> > mentioned.
>
> > However I *do* actually want to add syntax to the language.
>
> Good luck with that. The GIL is not going away any time soon (or
> probably ever) and as long as CPython is the "official"
> implementation, there are almost zero chances of adding syntax support
> for this. Besides, Guido and other py-devs are not particularly keen
> on threads as a parallelization mechanism.
>
> George

Hi George,

> The GIL is not going away any time soon (or probably ever) and as long as CPython is
> the "official" implementation, there are almost zero chances of adding syntax support
> for this.

What concerns me about this statement is that, if it is true, Python
risks falling behind when other languages which can exploit multicore
effectively start to come to the fore. I know that Microsoft is
actively researching in this area and they are hoping that F# will
offer good ways to exploit multi-core architectures.

As I understand it the reason for the GIL is to prevent problems with
garbage collection in multi-threaded applications. Without it the
reference count method is prone to race conditions. However it seems
like a fairly crude mechanism to solve this problem. Individual
semaphores could be used for each object reference counter, as in
Java.

Jeremy


From jeremy at martinfamily.freeserve.co.uk  Mon May 18 16:56:38 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Mon, 18 May 2009 13:56:38 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com> 
	<mailman.349.1242677260.8015.python-list@python.org>
Message-ID: <c43e9e94-dfcd-43d1-b29f-482aca4d7815@e24g2000vbe.googlegroups.com>

On 18 May, 21:07, Terry Reedy <tjre... at udel.edu> wrote:
> George Sakkis wrote:
> > On May 18, 5:27 am, jer... at martinfamily.freeserve.co.uk wrote:
>
> >> My suggestion is primarily about using multiple threads and sharing
> >> memory - something akin to the OpenMP directives that one of you has
> >> mentioned. To do this efficiently would involve removing the Global
> >> Interpreter Lock, or switching to Jython or Iron Python as you
> >> mentioned.
>
> >> However I *do* actually want to add syntax to the language.
>
> I can understand you having a preference, but you may have to choose
> between fighting over that method or achieving results. ?I agree with ...
>
> > Good luck with that. The GIL is not going away any time soon (or
> > probably ever) and as long as CPython is the "official"
> > implementation, there are almost zero chances of adding syntax support
> > for this. Besides, Guido and other py-devs are not particularly keen
> > on threads as a parallelization mechanism.
>
> Parallel processes can run on multiple processors as well as multiple
> cores within a processor. ?Some problems, like massive search, require
> multiple disks (or memories, or IO ports) as well as multiple processing
> units. ?There is debate over how useful massively multicore processors
> will actually be and for which types of problems.
>
> tjr

Hi Terry,

> Parallel processes can run on multiple processors as well as multiple
> cores within a processor.  Some problems, like massive search, require
> multiple disks (or memories, or IO ports) as well as multiple processing
> units.  There is debate over how useful massively multicore processors
> will actually be and for which types of problems.

I agree with this. My approach is in the same space as OpenMP - a
simple way for users to define shared memory parallelism. There is no
reason why it would not work with multiple disks or IO ports on the
same shared memory server. However for distributed memory hardware it
would be a non-starter. In that case we would need something like the
Message Passing Interface.

Jeremy


From davea at ieee.org  Mon May 18 17:24:12 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 18 May 2009 17:24:12 -0400
Subject: ? 'in' operator and fallback to __getitem__
In-Reply-To: <d40e1713-42f0-4b34-9562-ca07cc91c8e4@r31g2000prh.googlegroups.com>
References: <43218d93-a35c-4375-9f8e-6d10b91e12be@d38g2000prn.googlegroups.com>	<n4fQl.18513$Ux.1684@tornado.fastwebnet.it>
	<d40e1713-42f0-4b34-9562-ca07cc91c8e4@r31g2000prh.googlegroups.com>
Message-ID: <4A11D1FC.1090504@ieee.org>

Tim Hoffman wrote:
>
> Which suggests to me there must be some sort of order of precedence
> between __contains__ and __getitem__
> and 'for' statement must change the order in some manner.
>
> Thanks for the reply
>
>
> T
>   
>
(Please don't top-post.  It makes reading the quoted portions hard, 
since they're then out of order.   To solve the problem here, I had to 
delete the other parts)

"in" is both a keyword and an operator, with entirely different semantics.

As a keyword, it's used inside a   for statement, the expression (after 
the in) must return an iterable object.

As an operator, it's used inside an arbitrary expression.  It is this 
case which is described in the docs:

 >>>For user-defined classes which define the __contains__() 
<datamodel.html#object.__contains__> method, x in y is true if and only 
if y.__contains__(x) is true.

 >>>For user-defined classes which do not define __contains__() 
<datamodel.html#object.__contains__> and do define __getitem__(), 
<datamodel.html#object.__getitem__>
 >>> x in y is true if and only if there is a non-negative integer index 
/i/ such that x == y[i],
 >>> and all lower integer indices do not raise IndexError 
<../library/exceptions.html#exceptions.IndexError> exception. (If any 
other exception is
 >>>raised, it is as if in <#in> raised that exception).



 


From paul at boddie.org.uk  Mon May 18 17:31:02 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Mon, 18 May 2009 14:31:02 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
Message-ID: <701b8548-6fe8-41aa-9a0e-f668f6851fcb@b1g2000vbc.googlegroups.com>

On 18 Mai, 11:27, jer... at martinfamily.freeserve.co.uk wrote:
>
> Thanks for your responses to my original questions.

Thanks for your interesting response!

> Paul, thanks for explaining about the pprocess module which appears
> very useful. I presume that this is using multiple operating system
> processes rather than threads which would probably imply that it is
> suitable for coarse grained parallel programming rather than fine-
> grained because of overhead in starting up new processes and sharing
> objects. (How is that done, by the way?). It probably has advantages
> and disadvantages compared with thread based parallelism.

Communication via interprocess channels is done using pickled objects.
For large data volumes, the most efficient approach can actually
involve the filesystem. My opinion on the threads vs. processes debate
centres on the relative efficiency of creating processes on systems
which have evolved to minimise the cost of doing so: people seem to
believe that forking a process creates an entirely new copy, but this
is unlikely to be the case on most modern, popular general-purpose
operating systems.

> My suggestion is primarily about using multiple threads and sharing
> memory - something akin to the OpenMP directives that one of you has
> mentioned. To do this efficiently would involve removing the Global
> Interpreter Lock, or switching to Jython or Iron Python as you
> mentioned.

One could always share memory using processes: I think the ease of
doing so is the only argument for using threads, and the caveats
involved obviously lead us back to the global interpreter lock (in the
threaded situation).

> However I *do* actually want to add syntax to the language. I think
> that 'par' makes sense as an official Python construct - we already
> have had this in the Occam programming language for twenty-five years.
> The reason for this is ease of use. I would like to make it easy for
> amateur programmers to exploit natural parallelism in their
> algorithms. For instance somebody who wishes to calculate a property
> of each member from a list of chemical structures using the Python
> Daylight interface: with my suggestion they could potentially get a
> massive speed up just by changing 'for' to 'par' or 'map' to 'pmap'.
> (Or map with a parallel keyword argument set as suggested). At present
> they would have to manually chop up their work and run it as multiple
> processes in order to achieve the same - fine for expert programmers
> but not reasonable for people working in other domains who wish to use
> Python as a utility because of its fantastic productivity and ease of
> use.

Well, you have to know that the components actually lend themselves to
parallelisation, and the "chopping up" of the work would be similar to
that involved with one of the parallel processing libraries today: you
call something in each iteration that actually goes off with its own
piece of the data and runs in parallel.

> Let me clarify what I think par, pmap, pfilter and preduce would mean
> and how they would be implemented. A par loop is like a for loop,
> however the programmer is saying that the order in which the
> iterations are performed doesn't matter and they might be performed in
> parallel.

Actually, with pprocess's abstractions, the iteration ordering doesn't
really matter, either, although the processes are dispatched in order.
It's when the results are collected that the ordering matters: the
difference between maps and queues. (I suppose it's similar with other
libraries.)

>           The python system then has the option to allocate a number
> of threads to the task and share out the iterations accordingly
> between the threads. (It might be that the programmer should be
> allowed to explictly define the number of threads to use or can
> delegate that decision to the system). Parallel pmap and pfilter would
> be implemented in much the same way, although the resultant list might
> have to be reassembled from the partial results returned from each
> thread. As people have pointed out, parallel reduce is a tricky option
> because it requires the binary operation to be associative in which
> case it can be parallelised by calculating the result using a tree-
> based evaluation strategy.

The sharing out of tasks to threads or execution contexts is done
using various abstractions in pprocess which probably resemble the
"pool" abstraction in the multiprocessing library: only as tasks are
completed are the free resources allocated to new tasks. A parallel
reduce abstraction doesn't exist in pprocess, but you could roll your
own.

> I have used all of OpenMP, MPI, and Occam in the past. OpenMP adds
> parallelism to programs by the use of special comment strings, MPI by
> explicit calls to library routines, and Occam by explicit syntactical
> structures. Each has its advantages. I like the simplicity of OpenMP,
> the cross-language portability of MPI and the fact the concurrency is
> built in to the Occam language. What I am proposing here is a hybrid
> of the OpenMP and Occam approaches - a change to the language which is
> very natural and yet is easy for programmers to understand.
> Concurrency is generally regarded as the hardest concept for
> programmers to grasp.

It's interesting to hear your experiences on this topic. I still don't
see the need for special syntax; if you were to propose more pervasive
changes, like arbitrary evaluation ordering for function arguments or
the ability to prevent/detect side-effects, the motivation would be
clearer, I think.

Paul


From swellfr at googlemail.com  Mon May 18 17:38:53 2009
From: swellfr at googlemail.com (swellfr at googlemail.com)
Date: Mon, 18 May 2009 14:38:53 -0700 (PDT)
Subject: urllib and keep-alive header
Message-ID: <0c3a37a9-e8fc-400d-ae7f-7a70a16d770c@e23g2000vbe.googlegroups.com>

I would like to know if it is possible to create a connection to a web
server that keeps the underlying socket alive ( Connection : Keep-
Alive header in the HTTP request ) between request ( and can also be
closed on request )

Can someone provide me a small example showing it.


Thx


From ben+python at benfinney.id.au  Mon May 18 17:39:57 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Tue, 19 May 2009 07:39:57 +1000
Subject: Context manager, atexit processing,
	and PEP 3143 	DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>
	<87hbzk8eoh.fsf@benfinney.id.au>
	<ab4fa3490905181014v11bb0746p2f81f3a00dac9b8a@mail.gmail.com>
	<mailman.343.1242668632.8015.python-list@python.org>
Message-ID: <87my9a6qfm.fsf@benfinney.id.au>

MRAB <google at mrabarnett.plus.com> writes:

> Gunter Henriksen wrote:
> > If there is a function which triggers a one-shot switch, I like to
> > have a way to find out if it has already been triggered, I prefer to
> > have the function tell me if it triggered the switch or not, but I
> > would not want that to be by raising an exception.
> 
> The 'file' class also has a 'closed' method, so that's a good model to
> follow.

Yes, I find that convincing as well. (I might prefer it to instead
answer the question ?is it currently open??, i.e. an ?opened? query,
but that makes for more awkward English than ?closed?.)

-- 
 \           ?Are you thinking what I'm thinking, Pinky?? ?Uh... yeah, |
  `\     Brain, but where are we going to find rubber pants our size?? |
_o__)                                           ?_Pinky and The Brain_ |
Ben Finney


From dstanek at dstanek.com  Mon May 18 17:46:21 2009
From: dstanek at dstanek.com (David Stanek)
Date: Mon, 18 May 2009 17:46:21 -0400
Subject: Python code-bloat tool-- warning n00b stuff...
In-Reply-To: <147293.52806.qm@web31807.mail.mud.yahoo.com>
References: <1a3a139e0905161013p2ff1c024l260ad57433e1be20@mail.gmail.com>
	<gung8f$q2s$1@ger.gmane.org>
	<147293.52806.qm@web31807.mail.mud.yahoo.com>
Message-ID: <de32cc030905181446w5edcff27ta07402256a350dcf@mail.gmail.com>

On Mon, May 18, 2009 at 12:45 PM, david wright
>
> I would suggest looking into TDD (test driven development).
>
> This technique would be a good fit to eliminate you feeling of code bloat, in TDD you only write the necessary amount
> of code to make your test pass, hence you never write code that is not going to be utilized.
>
> It takes a little while to get used to this technique ( also, it can be much more difficult to apply in some situations) but it's well worth the effort. :). You'll have no trouble finding tons of resources for this topic.

TDD does help cut down on code bloat, but not because you are only
coding what will actually be used. Rather because of rule #3:
 1. Red - write just enough test code to make a test fail
 2. Green - write just enough production code to make the test pass
 3. Refactor - mercilessly reduce duplication
 4. Repeat

-- 
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek


From emile at fenx.com  Mon May 18 17:53:54 2009
From: emile at fenx.com (Emile van Sebille)
Date: Mon, 18 May 2009 14:53:54 -0700
Subject: Which C compiler?
In-Reply-To: <1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>	<4a11092f$0$30903$9b622d9e@news.freenet.de>
	<1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>
Message-ID: <gusl9q$shg$1@ger.gmane.org>

On 5/18/2009 1:27 PM Jive Dadson said...
> 
> I love Python, but the update regimen is very frustrating.  It's a 
> misery to me why every major release requires new versions of so much 
> application stuff.  No other software that I use is like that.  When I 
> upgrade Windoze, I do not have to get new matching versions of all my 
> editors, browsers, and whatnot.  But Python makes me do that, and that's 
> why I am stuck on release 2.4.  Even the pure Python stuff needs to be 
> copied from one "site-packages" to another.  Then I have to figure out 
> why it won't work.  I have fought my way through the upgrade path twice, 
> and I just can't face it again.
> 
> Thus endeth the rant.

Hmm.. I support python versions ranging from 1.52 though 2.6 on some 
40-50 production systems and don't have an issue with upgrades.  First, 
once I stabilize a production system it doesn't get upgrades anymore 
unless the machine breaks or the application specs change to the point 
where upgrade is better than maintaining.  Second, when setting up a new 
system I always start with the freshest versions of things (barring 
python 3.x which I haven't yet put in a production environment).

Upgrading because newer is available has been a problem as long as 
upgrades have been available.  Just this month some system snuck by me 
with windows update enabled only to have microsofts auto-update break 
the applications.

Just say no to updates...

Emile




From DustanGroups at gmail.com  Mon May 18 18:31:07 2009
From: DustanGroups at gmail.com (Dustan)
Date: Mon, 18 May 2009 15:31:07 -0700 (PDT)
Subject: Photoimage on button appears pixelated when button is disabled
References: <fb96adf5-28cd-4493-8070-993f30f1d78e@v4g2000vba.googlegroups.com>
	<a0be872b-ebff-4541-b22f-361409f56af4@l28g2000vba.googlegroups.com> 
	<mailman.285.1242569465.8015.python-list@python.org>
Message-ID: <a806c6e7-8ac7-4d93-b218-a1efb92a269c@n8g2000vbb.googlegroups.com>

On May 17, 7:11?am, Tim Golden <m... at timgolden.me.uk> wrote:
> Dustan wrote:
> > On May 15, 2:59 pm, Dustan <DustanGro... at gmail.com> wrote:
> >> In tkinter, when I place a photoimage on a button and disable the
> >> button, the image has background dots scattered through the image.
> >> Searching the web, I wasn't able to find any documentation on this
> >> behavior, nor how to turn it off. So here I am. How do I keep this
> >> from happening?
>
> >> Also, how can I extract the base-64 encoding of a GIF, so I can put
> >> the image directly into the code instead of having to keep a separate
> >> file for the image?
>
> >> All responses appreciated,
> >> Dustan
>
> > At the very least, someone ought to be able to provide an answer to
> > the second question.
>
> Well I know nothing about Tkinter, but to do base64 encoding,
> you want to look at the base64 module.
>
> TJG

Thanks.

And for my former question, I worked something out, figuring there
must be no solution.


From norseman at hughes.net  Mon May 18 18:47:41 2009
From: norseman at hughes.net (norseman)
Date: Mon, 18 May 2009 15:47:41 -0700
Subject: Which C compiler?
In-Reply-To: <1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>	<4a11092f$0$30903$9b622d9e@news.freenet.de>
	<1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>
Message-ID: <4A11E58D.7030208@hughes.net>

Jive Dadson wrote:
> Martin v. L?wis wrote:
>> Jive Dadson wrote:
>>> I am using Python 2.4.  I need to make a native Python extension for
>>> Windows XP.  I have both VC++ 6.0 and Visual C++ 2005 Express Edition.
>>> Will VC++ 6.0 do the trick?  That would be easier for me, because the
>>> project is written for that one.  If not, will the 2005 compiler do it?
>>
>> In general, to build extension modules, you need to use the same VC
>> version as the one that was used to build Python. For 2.4, that would
>> be Visual Studio 2003. So if you use VC 6, VS 2005, or VS 2008, you
>> may run into problems.
>>
>> Depending on what exactly the extension module does, it might work
>> fine also.
>>
>> Regards,
>> Martin
> 
> Thanks.  I think I might just use some variety of Popen instead.  I 
> don't need much communication between the C++ application and Python, 
> and it's not time-critical.  I cannot get flush() to work on the Python 
> side of the pipe however I try.  That seems to be a common complaint. 
> But I can work around it.
> 
> I love Python, but the update regimen is very frustrating.  It's a 
> misery to me why every major release requires new versions of so much 
> application stuff.  No other software that I use is like that.  When I 
> upgrade Windoze, I do not have to get new matching versions of all my 
> editors, browsers, and whatnot.  But Python makes me do that, and that's 
> why I am stuck on release 2.4.  Even the pure Python stuff needs to be 
> copied from one "site-packages" to another.  Then I have to figure out 
> why it won't work.  I have fought my way through the upgrade path twice, 
> and I just can't face it again.
> 
> Thus endeth the rant.
==============================
I suspect that if all python users were in the same room and the 
question "Are you NOT happy with python's upgrade requirements?" was 
asked you would find most hands in the air.  I have said it before - the 
current attitude of 'new means we start over' was what nearly destroyed 
Apple. Doesn't take joe public long to get tired of constantly 
re-buying, re-writing themselves, re-hiring the same people to re-write 
the same thing, etc... Most people who do programming are not for hire. 
They are the ones that write for their discipline to make their routine 
chores easier and less typo/error prone and thus (hopefully) have more 
take home money with less effort at the end of the day.  I bump heads 
with version problems daily and it does not make me happy either.  Can 
anyone give a valid excuse for not having a "new version" widget getting 
a new name?  Say os25.popen  os26.popen  os30.popen
                  pylib25     pylib26     pylib30
Sorry, but "Because we had to change (...) to make it work with (...)" 
is NOT a valid excuse for ripping the whole thing apart. At the end of 
the day (the program run), the data is still the data. It probably is 
still going to the same form it's always been converted into. The form 
that the boo-koo dollars proprietary package demands.  In short, while 
Python is a good idea and can do a great job acting standalone in some 
cases and as well as the glue between things, it is not an end unto 
itself.  It's just another tool.  Tools that keep breaking get tossed 
into the trash can and the vendor that makes them gets bad mouthed to 
everyone who will listen.
That is reality.



Steve


From norseman at hughes.net  Mon May 18 19:06:54 2009
From: norseman at hughes.net (norseman)
Date: Mon, 18 May 2009 16:06:54 -0700
Subject: Which C compiler?
In-Reply-To: <gusl9q$shg$1@ger.gmane.org>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>	<4a11092f$0$30903$9b622d9e@news.freenet.de>	<1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>
	<gusl9q$shg$1@ger.gmane.org>
Message-ID: <4A11EA0E.4050103@hughes.net>

Emile van Sebille wrote:
> On 5/18/2009 1:27 PM Jive Dadson said...
>>
>> I love Python, but the update regimen is very frustrating.  It's a 
>> misery to me why every major release requires new versions of so much 
>> application stuff.  No other software that I use is like that.  When I 
>> upgrade Windoze, I do not have to get new matching versions of all my 
>> editors, browsers, and whatnot.  But Python makes me do that, and 
>> that's why I am stuck on release 2.4.  Even the pure Python stuff 
>> needs to be copied from one "site-packages" to another.  Then I have 
>> to figure out why it won't work.  I have fought my way through the 
>> upgrade path twice, and I just can't face it again.
>>
>> Thus endeth the rant.
> 
> Hmm.. I support python versions ranging from 1.52 though 2.6 on some 
> 40-50 production systems and don't have an issue with upgrades.  First, 
> once I stabilize a production system it doesn't get upgrades anymore 

this is where the guy chides: cheat, cheat :)   see below

> unless the machine breaks or the application specs change to the point 
> where upgrade is better than maintaining.  Second, when setting up a new 
> system I always start with the freshest versions of things (barring 
> python 3.x which I haven't yet put in a production environment).
> 
> Upgrading because newer is available has been a problem as long as 
> upgrades have been available.  Just this month some system snuck by me 
> with windows update enabled only to have microsofts auto-update break 
> the applications.
> 
> Just say no to updates...
> 

Welcome to the club!

> Emile
> 
> 

You-all have a great day now! - ya here?

Steve


From sjmachin at lexicon.net  Mon May 18 19:29:38 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 18 May 2009 16:29:38 -0700 (PDT)
Subject: How can i use Spread Sheet as Data Store
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com> 
	<mailman.345.1242673985.8015.python-list@python.org>
Message-ID: <4e44e2f8-6aad-44b8-8b0b-a750683df57e@c18g2000prh.googlegroups.com>

On May 19, 5:12?am, Terry Reedy <tjre... at udel.edu> wrote:
> Kalyan Chakravarthy wrote:
> > Hi All,
> > ? ? ? ? ? ? ?I have data in Spread Sheet ( First Name and Last Name),
> > how can i see ?this data ?in Python code ( how can i use Spread Sheet as
> > Data Store ) .
>
> I you have a choice, a plain text file is MUCH easier.

for line in open('guff.txt'):
    first, last = line.rstrip('\n').split('\t')

> Or, you can output a plain text data.csv (comma-separated variable) file
> from the spreadsheet and read that with the csv module.

import csv
for row in csv.reader(open('guff.csv', 'rb')):
    first, last = row

Or, if you have an Excel XLS file, use xlrd:

import xlrd
book = xlrd.open_workbook('guff.xls')
sheet = book.sheet_by_index(0)
for rowx in xrange(sheet.nrows):
    first, last = sheet.row_values(rowx)

So far I don't see "MUCH" easier ... than what? Perhaps much easier
than using odfpy, which states right up front """Odfpy aims to be a
complete API for OpenDocument in Python. Unlike other more convenient
APIs, this one is essentially an abstraction layer just above the XML
format.""" Perhaps much easier than using COM?


From steve at REMOVE-THIS-cybersource.com.au  Mon May 18 19:32:56 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 18 May 2009 23:32:56 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
Message-ID: <0221e31a$0$20621$c3e8da3@news.astraweb.com>

On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:

> However I *do* actually want to add syntax to the language. I think that
> 'par' makes sense as an official Python construct - we already have had
> this in the Occam programming language for twenty-five years. The reason
> for this is ease of use. I would like to make it easy for amateur
> programmers to exploit natural parallelism in their algorithms. For
> instance somebody who wishes to calculate a property of each member from
> a list of chemical structures using the Python Daylight interface: with
> my suggestion they could potentially get a massive speed up just by
> changing 'for' to 'par' or 'map' to 'pmap'. (Or map with a parallel
> keyword argument set as suggested). At present they would have to
> manually chop up their work and run it as multiple processes in order to
> achieve the same - fine for expert programmers but not reasonable for
> people working in other domains who wish to use Python as a utility
> because of its fantastic productivity and ease of use.

There seems to be some discrepancy between this, and what you wrote in 
your first post:

"There would be no locking and it would be the programmer's 
responsibility to ensure that the loop was truly parallel and correct."

So on the one hand, you want par to be utterly simple-minded and to do no 
locking. On the other hand you want it so simple to use that amateurs can 
mechanically replace 'for' with 'par' in their code and everything will 
Just Work, no effort or thought required. But those two desires are 
inconsistent.

Concurrency is an inherently complicated problem: deadlocks and race 
conditions abound, and are notoriously hard to reproduce, let alone 
debug. If par is simple, and does no locking, then the programmer needs 
to worry about those complications. If you want programmers to ignore 
those complications, either (1) par needs to be very complicated and 
smart, to do the Right Thing in every case, or (2) you're satisfied if 
par produces buggy code when used in the fashion you recommend.

The third option is, make par really simple and put responsibility on the 
user to write code which is concurrent. I think that's the right 
solution, but it means a simplistic "replace `for` with `par` and your 
code will run faster" will not work. It might run faster three times out 
of five, but the other two times it will hang in a deadlock, or produce 
incorrect results, or both.



-- 
Steven


From bluefisher80 at gmail.com  Mon May 18 20:37:58 2009
From: bluefisher80 at gmail.com (Jim Qiu)
Date: Tue, 19 May 2009 08:37:58 +0800
Subject: A newbie question about some code
In-Reply-To: <op.ut4cops9a8ncjz@gnudebst>
References: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
	<op.ut4cops9a8ncjz@gnudebst>
Message-ID: <b42c5a480905181737r78def19av42c01fc374bf2d22@mail.gmail.com>

On Mon, May 18, 2009 at 5:30 PM, Rhodri James
<rhodri at wildebst.demon.co.uk>wrote:

> On Mon, 18 May 2009 10:18:52 +0100, Jim Qiu <bluefisher80 at gmail.com>
> wrote:
>
>  Please check the blue highlighted part,  I don't understand how the object
>> get the property?
>>
>
> Colours and highlighting don't come across in Usenet postings.  Could
> you be a bit more specific.  Which object, and what property?
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list


It's the out property. and I realized my mistake after reading  Chris
Rebert's Message.

Thanks.

Jim
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From JackTradesPublic at gmail.com  Mon May 18 21:03:01 2009
From: JackTradesPublic at gmail.com (Jack Trades)
Date: Mon, 18 May 2009 18:03:01 -0700 (PDT)
Subject: Subversion commit from Python?
Message-ID: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>

I'm wondering if there's an easy way to do a 'svn commit' on a
directory from Python.

More Details:
I have a wiki-like program that stores its data in a directory that I
would like to put under version control to be able to roll back
unwanted changes.  The program is stored in two directories, a 'cgi'
directory which displays the data and allows user editing and a 'data'
directory.  The 'data' directory is a checked-out version of the
repository.
Originally I had the 'data' directory in the same directory as the cgi
scripts and was using os.system("svn commit"), however I kept running
into weird bugs with this method.  So I moved the data directory out
of the cgi directory and plan to use a separate repository.  So is
there a prefered way to commit this directory to a subversion
repository from a Python script?


From pavlovevidence at gmail.com  Mon May 18 22:31:06 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 18 May 2009 19:31:06 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com> 
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com>
Message-ID: <a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com>

On May 18, 1:52?pm, jer... at martinfamily.freeserve.co.uk wrote:
> As I understand it the reason for the GIL is to prevent problems with
> garbage collection in multi-threaded applications.

Not really.  It's main purpose to prevent context switches from
happening in the middle of some C code (essentially it makes all C
code a "critical" section, except when the C code explicitly releases
the GIL).  This tremendously simplifies the task of writing extension
modules, not to mention the Python core.


> Without it the
> reference count method is prone to race conditions. However it seems
> like a fairly crude mechanism to solve this problem. Individual
> semaphores could be used for each object reference counter, as in
> Java.

Java doesn't use reference counting.

Individual locks on the refcounts would be prohibitively expensive in
Python, a cost that Java doesn't have.

Even if you decided to accept the penalty and add locking to
refcounts, you still have to be prepared for context switching at any
time when writing C code, which means in practice you have to lock any
object that's being accessed--that's in addition to the refcount lock.

I am not disagreeing with your assessment in general, it would be
great if Python were better able to take advantage of multiple cores,
but it's not as simple a thing as you're making it out to be.


Carl Banks


From hunteroakesgun at gmail.com  Mon May 18 22:36:44 2009
From: hunteroakesgun at gmail.com (hunteroakesgun at gmail.com)
Date: Mon, 18 May 2009 19:36:44 -0700 (PDT)
Subject: identifying live hosts on a network
Message-ID: <069f821d-1b73-4ed9-b298-09e7c0548122@p6g2000pre.googlegroups.com>

HI
I am new to python and am having trouble coming up with a script that
idenifies all the live hosts on my network.
thanks Hunter


From ronggui.huang at gmail.com  Mon May 18 23:45:31 2009
From: ronggui.huang at gmail.com (Wincent)
Date: Mon, 18 May 2009 20:45:31 -0700 (PDT)
Subject: How can i use Spread Sheet as Data Store
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com> 
	<mailman.345.1242673985.8015.python-list@python.org>
	<4e44e2f8-6aad-44b8-8b0b-a750683df57e@c18g2000prh.googlegroups.com>
Message-ID: <60224e58-8241-4ec1-a6b5-6027a73164af@z16g2000prd.googlegroups.com>

If you want to write to a csv file, the other option is savetxt in
NumPy module.

Best

On May 19, 7:29?am, John Machin <sjmac... at lexicon.net> wrote:
> On May 19, 5:12?am, Terry Reedy <tjre... at udel.edu> wrote:
>
> > Kalyan Chakravarthy wrote:
> > > Hi All,
> > > ? ? ? ? ? ? ?I have data in Spread Sheet ( First Name and Last Name),
> > > how can i see ?this data ?in Python code ( how can i use Spread Sheet as
> > > Data Store ) .
>
> > I you have a choice, a plain text file is MUCH easier.
>
> for line in open('guff.txt'):
> ? ? first, last = line.rstrip('\n').split('\t')
>
> > Or, you can output a plain text data.csv (comma-separated variable) file
> > from the spreadsheet and read that with the csv module.
>
> import csv
> for row in csv.reader(open('guff.csv', 'rb')):
> ? ? first, last = row
>
> Or, if you have an Excel XLS file, use xlrd:
>
> import xlrd
> book = xlrd.open_workbook('guff.xls')
> sheet = book.sheet_by_index(0)
> for rowx in xrange(sheet.nrows):
> ? ? first, last = sheet.row_values(rowx)
>
> So far I don't see "MUCH" easier ... than what? Perhaps much easier
> than using odfpy, which states right up front """Odfpy aims to be a
> complete API for OpenDocument in Python. Unlike other more convenient
> APIs, this one is essentially an abstraction layer just above the XML
> format.""" Perhaps much easier than using COM?



From cournape at gmail.com  Tue May 19 00:15:14 2009
From: cournape at gmail.com (David Cournapeau)
Date: Tue, 19 May 2009 13:15:14 +0900
Subject: Package problem
In-Reply-To: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
Message-ID: <5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>

On Tue, May 19, 2009 at 4:52 AM, Sverre <sverreodegard at gmail.com> wrote:
> I'm using Ubuntu and some of the packages in the repository are too
> old. So I got the thought to remove nearly ?all packages downloaded
> from the repository and install them with easy_install. Is this a way
> to go without greater problems?

This is probably the worst way to do it :)

As a rule, you should never install anything from sources (be it
python packages or anything else) in /usr, which should be considered
as 'owned' by the package. By /usr is owned, I mean that anything
installed with prefix /usr (/usr/lib, /usr/include, etc...) can be
overwritten by the Ubuntu package manager. Unfortunately, by default,
python setup.py install will install in /usr (whereas most sources
packages installed in /usr/local/ if no --prefix is given - that's the
case of any software using autoconf, like python for example).

You could either install system-wide (for all users) in /usr/local, or
somewhere just for yourself. To handle dependencies, you could use
something like virtualenv for packages using autotools. For
development, a more heavy-weight (but more reliable) method is to use
chroot and other 'jail-like' systems.

You should avoid building by yourself things which depend on a lot of
C libraries - it quickly becomes unmanageable in my own experience.
For some distributions which have long release periods (e.g. RHEL),
that's a significant problem without any easy solution (I almost
always use a virtual machine in that case if possible).

cheers,

David


From cournape at gmail.com  Tue May 19 00:16:19 2009
From: cournape at gmail.com (David Cournapeau)
Date: Tue, 19 May 2009 13:16:19 +0900
Subject: Package problem
In-Reply-To: <5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
Message-ID: <5b8d13220905182116h301cf355j4de9425c09eca291@mail.gmail.com>

On Tue, May 19, 2009 at 1:15 PM, David Cournapeau <cournape at gmail.com> wrote:

> something like virtualenv for packages using autotools.

   ^^^^^^^
Sorry, I meant setuptools here, not autotools

David


From davea at ieee.org  Tue May 19 00:22:42 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 19 May 2009 00:22:42 -0400
Subject: A newbie question about some code
In-Reply-To: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
References: <b42c5a480905180218g272335b3o409e80fe222b6960@mail.gmail.com>
Message-ID: <4A123412.40702@ieee.org>

Jim Qiu wrote:
> Hi everyone.
> I am reading a python library code and found something i can not understand.
> Please help!
>
> class Envelope(object):
>
>     def __init__(self,ta_info):
>         self.ta_info = ta_info
>
>
>     def writefilelist(self,ta_list,tofile):
>         for filename in ta_list:
>             fromfile = botslib.botsopendata(filename,
> 'rb',self.ta_info['charset'])
>             shutil.copyfileobj(fromfile,tofile)
>             fromfile.close()
>
>     def convertfilelist(self,ta_list):
>         return [botslib.botsgetabspathdata(filename) for filename in
> ta_list]
>
>
>
> class myxmlenvelop(Envelope):
>     def __init__(self,ta_info,ta_list):
>         ''' class for (test) xml envelope. There is no standardised
> XML-envelope!
>             writes a new XML-tree; uses places-holders for XML-files to
> include; real enveloping is done by ElementTree's include'''
>         self.ta_info = ta_info
>         self._openoutenvelope()
>         #~ self.out.put({'BOTSID':'root','xmlns:xi':"
> http://www.w3.org/2001/XInclude"})     #works, but attribute is not removed
> bij ETI.include
>         self.out.put({'BOTSID':'root'})
>         ta_list = self.convertfilelist(ta_list)
>         for filename in ta_list:
>             self.out.put({'BOTSID':'root'},{'BOTSID':'{
> http://www.w3.org/2001/XInclude}include','parse':"xml",'href':filename})
>         self.out.envelopewrite(self.out.root
>
>
> Please check the blue highlighted part,  I don't understand how the object
> get the property?
>
>
> Jim
>
>   
Now that you tell us you want to know where the out property is coming 
from, I can respond.

Clearly, you don't have the whole class listed here.  Where's the 
_openoutenvelop() method, for example?   I'd guess it creates the out 
attribute.  Since it gets called from __init__(), and before the 
reference to self.out, that's what makes the most sense.




From ldo at geek-central.gen.new_zealand  Tue May 19 00:26:23 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 19 May 2009 16:26:23 +1200
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
Message-ID: <gutcdg$3st$4@lust.ihug.co.nz>

In message <2904e7de-0a8d-4697-9c44-
c83bb5319de4 at s31g2000vbp.googlegroups.com>, Jack Trades wrote:

> Originally I had the 'data' directory in the same directory as the cgi
> scripts and was using os.system("svn commit"), however I kept running
> into weird bugs with this method.

What bugs?



From jeff at jmcneil.net  Tue May 19 00:30:26 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Mon, 18 May 2009 21:30:26 -0700 (PDT)
Subject: How can i use Spread Sheet as Data Store
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com> 
	<mailman.345.1242673985.8015.python-list@python.org>
	<4e44e2f8-6aad-44b8-8b0b-a750683df57e@c18g2000prh.googlegroups.com>
	<60224e58-8241-4ec1-a6b5-6027a73164af@z16g2000prd.googlegroups.com>
Message-ID: <8c37da7c-c0ba-4b45-8257-18a29629aafd@l28g2000vba.googlegroups.com>

On May 18, 11:45?pm, Wincent <ronggui.hu... at gmail.com> wrote:
> If you want to write to a csv file, the other option is savetxt in
> NumPy module.
>
> Best
>
> On May 19, 7:29?am, John Machin <sjmac... at lexicon.net> wrote:
>
> > On May 19, 5:12?am, Terry Reedy <tjre... at udel.edu> wrote:
>
> > > Kalyan Chakravarthy wrote:
> > > > Hi All,
> > > > ? ? ? ? ? ? ?I have data in Spread Sheet ( First Name and Last Name),
> > > > how can i see ?this data ?in Python code ( how can i use Spread Sheet as
> > > > Data Store ) .
>
> > > I you have a choice, a plain text file is MUCH easier.
>
> > for line in open('guff.txt'):
> > ? ? first, last = line.rstrip('\n').split('\t')
>
> > > Or, you can output a plain text data.csv (comma-separated variable) file
> > > from the spreadsheet and read that with the csv module.
>
> > import csv
> > for row in csv.reader(open('guff.csv', 'rb')):
> > ? ? first, last = row
>
> > Or, if you have an Excel XLS file, use xlrd:
>
> > import xlrd
> > book = xlrd.open_workbook('guff.xls')
> > sheet = book.sheet_by_index(0)
> > for rowx in xrange(sheet.nrows):
> > ? ? first, last = sheet.row_values(rowx)
>
> > So far I don't see "MUCH" easier ... than what? Perhaps much easier
> > than using odfpy, which states right up front """Odfpy aims to be a
> > complete API for OpenDocument in Python. Unlike other more convenient
> > APIs, this one is essentially an abstraction layer just above the XML
> > format.""" Perhaps much easier than using COM?

I didn't see it mentioned yet, but the Google Spreadsheet application
is also something you could use if you have a choice. It has a fairly
useful API that let's you manage elements. I'm not sure if it's an
option for you or not.

http://code.google.com/apis/spreadsheets/overview.html

Thanks,

Jeff
mcjeff.blogspot.com


From david.lyon at preisshare.net  Tue May 19 00:31:57 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 19 May 2009 00:31:57 -0400
Subject: Package problem
In-Reply-To: <5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
Message-ID: <39468261f5a617fdea45101268b7be6c@preisshare.net>


Hi David,

I guess paraphrased you are saying "don't touch your packages"..

To my point of view, the needs of the developer override the
priorities of the O/S house...

We should expect "old" packages on our systems from the O/S

and have an easier way to update them to whatever we want..

That's why imho, we can benefit with a package manager tool
that can do just that. I just don't have anything running
on ubuntu just yet - sadly.

On Tue, 19 May 2009 13:15:14 +0900, David Cournapeau <cournape at gmail.com>
wrote:
> On Tue, May 19, 2009 at 4:52 AM, Sverre <sverreodegard at gmail.com> wrote:
>> I'm using Ubuntu and some of the packages in the repository are too
>> old. So I got the thought to remove nearly  all packages downloaded
>> from the repository and install them with easy_install. Is this a way
>> to go without greater problems?
> 
> This is probably the worst way to do it :)
> 
> As a rule, you should never install anything from sources (be it
> python packages or anything else) in /usr, which should be considered
> as 'owned' by the package. By /usr is owned, I mean that anything
> installed with prefix /usr (/usr/lib, /usr/include, etc...) can be
> overwritten by the Ubuntu package manager. Unfortunately, by default,
> python setup.py install will install in /usr (whereas most sources
> packages installed in /usr/local/ if no --prefix is given - that's the
> case of any software using autoconf, like python for example).
> 
> You could either install system-wide (for all users) in /usr/local, or
> somewhere just for yourself. To handle dependencies, you could use
> something like virtualenv for packages using autotools. For
> development, a more heavy-weight (but more reliable) method is to use
> chroot and other 'jail-like' systems.
> 
> You should avoid building by yourself things which depend on a lot of
> C libraries - it quickly becomes unmanageable in my own experience.
> For some distributions which have long release periods (e.g. RHEL),
> that's a significant problem without any easy solution (I almost
> always use a virtual machine in that case if possible).
> 
> cheers,
> 
> David


From ldo at geek-central.gen.new_zealand  Tue May 19 00:34:13 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 19 May 2009 16:34:13 +1200
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
Message-ID: <gutcs6$47g$1@lust.ihug.co.nz>

In message <mff7e6-e43.ln1 at satorlaser.homedns.org>, Ulrich Eckhardt wrote:

> If you took a look at Java, you
> would notice that the core language syntax is much simpler than Python's.

I don't think it is. Look at things like "private" versus "protected" versus 
"public" with or without "static" and "final", "class" versus "interface", 
what "new" means, and all the predefined types being reserved words, 
including of course the concept of "void", special syntax for defining array 
types, and typecasting -- these are all things that Python manages to do 
without.

And that's not even counting newer language features added since the last 
time I did any Java programming.



From gokhansever at gmail.com  Tue May 19 00:35:04 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Mon, 18 May 2009 23:35:04 -0500
Subject: Question about locals()
Message-ID: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>

Hello,

Could you please explain why locals() allow me to create variables that are
not legal in Python syntax. Example: locals()['1abc'] = 55. Calling of 1abc
results with a syntax error. Shouldn't it be better to raise an error during
the variable creation time?

Thank you

G?khan
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From ldo at geek-central.gen.new_zealand  Tue May 19 00:35:39 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 19 May 2009 16:35:39 +1200
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
Message-ID: <gutcur$47g$2@lust.ihug.co.nz>

In message <07e5af6c-d41d-4a4a-8e2e-
f27bc92c96e5 at f16g2000vbf.googlegroups.com>, Steve Ferg wrote:

> On the one hand, there are developers who love big IDEs with lots of
> features (code generation, error checking, etc.), and rely on them to
> provide the high level of support needed to be reasonably productive
> in heavy-weight languages (e.g. Java).
> 
> On the other hand there are developers who much prefer to keep things
> light-weight and simple.

Would it be fair to say the first type tends to congregate in herds, 
particularly in corporate IT departments, while the latter tends to operate 
on a more individual basis?



From cournape at gmail.com  Tue May 19 00:53:18 2009
From: cournape at gmail.com (David Cournapeau)
Date: Tue, 19 May 2009 13:53:18 +0900
Subject: Package problem
In-Reply-To: <39468261f5a617fdea45101268b7be6c@preisshare.net>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
	<39468261f5a617fdea45101268b7be6c@preisshare.net>
Message-ID: <5b8d13220905182153j490f4826kf2b21422de901210@mail.gmail.com>

On Tue, May 19, 2009 at 1:31 PM, David Lyon <david.lyon at preisshare.net> wrote:
>
> Hi David,
>
> I guess paraphrased you are saying "don't touch your packages"..
>
> To my point of view, the needs of the developer override the
> priorities of the O/S house...
>
> We should expect "old" packages on our systems from the O/S
>
> and have an easier way to update them to whatever we want..
>
> That's why imho, we can benefit with a package manager tool
> that can do just that. I just don't have anything running
> on ubuntu just yet - sadly.

Given that nobody has managed to solve this problem, I doubt you will
find a solution. If there was a reasonable solution, it would have
already been developed. Solutions for developers include independent
environments, avoiding dependencies as much as possible, and
controlling everything by yourself. Trying to fight the OS deployment
system is thinking backward IMHO.

cheers,

David


From kalyanchakravarthy at hyit.com  Tue May 19 01:21:57 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Tue, 19 May 2009 10:51:57 +0530
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <loom.20090518T151856-387@post.gmane.org>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
	<loom.20090518T151856-387@post.gmane.org>
Message-ID: <8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com>

Hi John
             I am using  Google Spread Sheet with 20 rows of data ,
            OS is  Windows XP
            Python2.6

Actually my requirement is
in an web application when user enters User name and Password,
back end i needs to check, is it they entered correct user name with
password ( here i want to read the Spread Sheet Data in Python code  ),
for this i will keep all the user names and passwords in Google Spread Sheet

now tell me how can i read Spread Sheet data in Python

Reply me

Regards
Kalyan





On Mon, May 18, 2009 at 8:56 PM, John Machin <sjmachin at lexicon.net> wrote:

> Kalyan Chakravarthy <kalyanchakravarthy <at> hyit.com> writes:
>
> >
> > Hi All,             I have data in Spread Sheet ( First Name and Last
> Name),
> how can i see  this data  in Python code ( how can i use Spread Sheet as
> Data
> Store ) . -- RegardsKalyan
>
> Hi Kalyan,
>
> A few questions ... the answers might help us help you better:
>
> What type of spreadsheet do you have:
> .ods (produced by OpenOffice.org's calc)?
> .gnumeric?
> .xls (MS Excel 2003)?
> .xlsx (MS Excel 2007)?
> something else?
>
> Do you want to update the spreadsheet using Python, or will that be done
> manually? How many rows of data are you likely to have?
>
> What version of Python do you plan to use?
>
> What OS are you using?
>
> Cheers,
> John
>
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Regards
Kalyan
Mobile no: +91 9985351220
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From mail at johnohagan.com  Tue May 19 01:27:17 2009
From: mail at johnohagan.com (John O'Hagan)
Date: Tue, 19 May 2009 05:27:17 +0000
Subject: Question about locals()
In-Reply-To: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
Message-ID: <200905190527.18214.mail@johnohagan.com>

On Tue, 19 May 2009, G?khan SEVER wrote:
> Hello,
>
> Could you please explain why locals() allow me to create variables that are
> not legal in Python syntax. Example: locals()['1abc'] = 55. Calling of 1abc
> results with a syntax error. Shouldn't it be better to raise an error
> during the variable creation time?
>

The docs warn against modifying locals() because for one thing, the 
interpreter may not know about the changes you make. 

You can add any item to the locals() dictionary without causing an error, but 
that doesn't necessarily mean you have created a legal object and named it.

 But admittedly that doesn't actually answer your question. :)

Regards,

John




From david.lyon at preisshare.net  Tue May 19 01:35:32 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 19 May 2009 01:35:32 -0400
Subject: Package problem
In-Reply-To: <5b8d13220905182153j490f4826kf2b21422de901210@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
	<39468261f5a617fdea45101268b7be6c@preisshare.net>
	<5b8d13220905182153j490f4826kf2b21422de901210@mail.gmail.com>
Message-ID: <46d018218eee7332fdf436ed42afdca3@preisshare.net>

On Tue, 19 May 2009 13:53:18 +0900, David Cournapeau <cournape at gmail.com>
wrote:
> Given that nobody has managed to solve this problem, I doubt you will
> find a solution. 

It is solved in other languages.. for example perl.. and delphi

> If there was a reasonable solution, it would have
> already been developed. 

Maybe we are slower because we like to do things "better"

> Trying to fight the OS deployment system is thinking backward IMHO.

Fight it ??? I didn't even get a python interpreter with my operating
system...

So there's no possible way I can be against it...


David




From JackTradesPublic at gmail.com  Tue May 19 01:48:30 2009
From: JackTradesPublic at gmail.com (Jack Trades)
Date: Mon, 18 May 2009 22:48:30 -0700 (PDT)
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<gutcdg$3st$4@lust.ihug.co.nz>
Message-ID: <ac63e27e-2dd9-4c27-ace0-d9e205be7afa@s31g2000vbp.googlegroups.com>

On May 19, 12:26?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <2904e7de-0a8d-4697-9c44-
>
> c83bb5319... at s31g2000vbp.googlegroups.com>, Jack Trades wrote:
> > Originally I had the 'data' directory in the same directory as the cgi
> > scripts and was using os.system("svn commit"), however I kept running
> > into weird bugs with this method.
>
> What bugs?

I'm not 100% sure, but I think it had to do with executable
permissions on the cgi scripts.  I would click on a link in the main
document (named 'add section') and it worked as expected.  After
inserting the information for 'add section' and submitting it (info
was saved in the data folder, then a commit was done on the whole
project), clicking on the same 'add section' link would produce an
error (going back to the 'add section' script asked me to download it
instead of displaying it).

I'm using a very simple server to develop this on my computer...

import BaseHTTPServer
import CGIHTTPServer
import cgitb; cgitb.enable()  ## This line enables CGI error reporting

server = BaseHTTPServer.HTTPServer
handler = CGIHTTPServer.CGIHTTPRequestHandler
server_address = ("", 8000)
handler.cgi_directories = [""]

httpd = server(server_address, handler)
httpd.serve_forever()

I got no information about the error at all, and after some time
completely gave up on it.  I'm only guessing that it was a permissions
problem.  I have made a huge number of modifications to the program
since then (about 2 days ago), and am unable to investigate it
further.  I was just wondering if using os.system('svn commit') was
the right approach, or if there was a "more Pythonic" way of doing
this.


From stefan_ml at behnel.de  Tue May 19 01:50:13 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 19 May 2009 07:50:13 +0200
Subject: Conceptual flaw in pxdom?
In-Reply-To: <cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
Message-ID: <4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>

Paul Boddie wrote:
> On 18 Mai, 08:54, Stefan Behnel wrote:
>> Emanuele D'Arrigo wrote:
>>> I'm looking at pxdom and in particular at its foundation class
>>> DOMObject
>> I didn't know pxdom, but looking at it now I can see that it hasn't been
>> updated since 2006. Not sure if that means that it is complete or that it
>> has been abandoned.
> 
> Maybe the developer is mostly satisfied with it.

Well, hard to tell without asking the author. I'm far from saying that a
"complete" piece of software is a bad thing, but bit-rot is still the death
 of all now-working software.


>> Anyway, seeing that it only provides DOM compliance, without anything
>> further like XPath or whatever, and that it doesn't focus on performance in
>> any way, you might still be better off with ElementTree, which is in the
>> stdlib since Python 2.5 (and available for Py2.2+).
> 
> To put the inquirer's remarks in context, I suggested that he look at
> pxdom specifically as a replacement for minidom and in response to the
> following statement: "I've used etree and lxml successfully before but
> I wanted to understand how close I can get to the W3C DOM standards."
> Maybe you missed that thread, but here's a link to it:
> 
> http://groups.google.com/group/comp.lang.python/browse_frm/thread/d445363b99001ad6

Ah, yes, I missed that thread. I always wonder why people want "DOM
compliance". I don't consider that a value by itself, and I don't see the
advantage that the DOM API has over other XML APIs (which, most of the
time, were designed to make life simpler for DOM suffering developers). I
find it a lot more important to get the stuff working quickly and in a
(somewhat) robust way, which is hard to achieve in DOM code. It's pretty
easy to write unmaintainable code that uses the DOM API, though.

Stefan


From dropbox at a-nugget.de  Tue May 19 01:50:23 2009
From: dropbox at a-nugget.de (Guido Goldstein)
Date: Tue, 19 May 2009 07:50:23 +0200
Subject: UDP reading on multiple sockets
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net>
	<15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>
	<27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
Message-ID: <m2d4a54p5s.fsf@mail.a-nugget.de>


Hi!

On Mon, 18 May 2009 06:19:01 -0700 (PDT)
  thomas.vogel at likeabird.de wrote:
[...]
> The only honest answer would be that I'm totaly unfamiliar with select
> and also the documentation I found wasn't able to clear the picture.
> So are there examples of using select together with sockets available?

If you want to write something related to networks you should know
this book:
  http://www.kohala.com/start/unpv12e.html
Also found at
  http://www.amazon.de/UNIX-Network-Programming-Sockets-Networking/dp/013490012X

MfT
  Guido


From tjreedy at udel.edu  Tue May 19 01:54:03 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 19 May 2009 01:54:03 -0400
Subject: Question about locals()
In-Reply-To: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
Message-ID: <guthhp$nn5$1@ger.gmane.org>

G?khan SEVER wrote:
> Hello,
> 
> Could you please explain why locals() allow me to create variables that 
> are not legal in Python syntax.

It doesn't.

> Example: locals()['1abc'] = 55. Calling 
> of 1abc results with a syntax error.

Within a function, locals() is a persistemt dictionary copy of the local 
namespace.  In that situation, using even a legal name as the key does 
not change the local namespace, and trying to use that legal name will 
give a NameError.

Better to ask about globals(), which *is* the global namespace.

  Shouldn't it be better to raise an
> error during the variable creation time?

To do that would require a separate legal-name-string-only dictionary.
That has been considered, but has not seemed worth the trouble.
Also, people have found uses for what you are calling an error.

Few newbies try to add non-identifiers to locals().  More often, they 
fail to real the red warning about not trying to add even a legal 
identifier.

Terry Jan Reedy



From clp2 at rebertia.com  Tue May 19 02:01:10 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 18 May 2009 23:01:10 -0700
Subject: Seeking old post on developers who like IDEs vs developers who 
	like simple languages
In-Reply-To: <gutcur$47g$2@lust.ihug.co.nz>
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<gutcur$47g$2@lust.ihug.co.nz>
Message-ID: <50697b2c0905182301o137b66bfn6bd5cd4ce1103441@mail.gmail.com>

On Mon, May 18, 2009 at 9:35 PM, Lawrence D'Oliveiro
<ldo at geek-central.gen.new_zealand> wrote:
> In message <07e5af6c-d41d-4a4a-8e2e-
> f27bc92c96e5 at f16g2000vbf.googlegroups.com>, Steve Ferg wrote:
>
>> On the one hand, there are developers who love big IDEs with lots of
>> features (code generation, error checking, etc.), and rely on them to
>> provide the high level of support needed to be reasonably productive
>> in heavy-weight languages (e.g. Java).
>>
>> On the other hand there are developers who much prefer to keep things
>> light-weight and simple.
>
> Would it be fair to say the first type tends to congregate in herds,
> particularly in corporate IT departments, while the latter tends to operate
> on a more individual basis?

That would certainly explain Lisp hackers!
*(ducks)*

Cheers,
Chris
-- 
http://blog.rebertia.com


From steven at REMOVE.THIS.cybersource.com.au  Tue May 19 02:06:23 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 19 May 2009 06:06:23 GMT
Subject: Question about locals()
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
Message-ID: <pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>

Sorry for breaking threading, the original post is not being carried by 
my ISP. 


On Tue, 19 May 2009, G?khan SEVER wrote:
> Hello,
>
> Could you please explain why locals() allow me to create variables that
> are not legal in Python syntax. Example: locals()['1abc'] = 55. Calling
> of 1abc results with a syntax error. Shouldn't it be better to raise an
> error during the variable creation time?

No, because it isn't an error to use '1abc' as a dictionary key.

"locals()['1abc'] = 55" does not create a variable. It creates an object 
55, a string '1abc', and uses that string as the key in a dict with 55 as 
the value.

"locals()['abc'] = 55" does not create a variable either. It does exactly 
the same thing as above, except that in this case 'abc' happens to be a 
valid identifier.

"abc = 55" also does not create a variable. What it does is exactly the 
same as the above, except that the dictionary key is forced to be a valid 
identifier by the parser (or perhaps the lexer): the parser won't accept 
1abc as a valid identifier, so you can't execute "1abc = 55".

(Almost... there's actually a slight complication, namely that making 
changes to locals() inside a function does not work.)

Python's programming model is based on namespaces, and namespaces are 
implemented as dictionaries: so-called "variables" are key/value pairs 
inside a dictionary. Just because a dictionary is used as a namespace 
doesn't stop it from being used as a dictionary: you can add any keys/
values which would otherwise be valid. It's still a dictionary, just like 
any other dictionary.

>>> globals()[45] = None
>>> globals()
{'__builtins__': <module '__builtin__' (built-in)>, 45: None, '__name__': 
'__main__', '__doc__': None}


As for *why* this is done this way, the answer is simplicity of 
implementation. Dictionaries don't need to care about what counts as a 
valid identifier. Only the lexer/parser needs to care.


-- 
Steven


From cournape at gmail.com  Tue May 19 02:45:42 2009
From: cournape at gmail.com (David Cournapeau)
Date: Tue, 19 May 2009 15:45:42 +0900
Subject: Package problem
In-Reply-To: <46d018218eee7332fdf436ed42afdca3@preisshare.net>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
	<39468261f5a617fdea45101268b7be6c@preisshare.net>
	<5b8d13220905182153j490f4826kf2b21422de901210@mail.gmail.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
Message-ID: <5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>

On Tue, May 19, 2009 at 2:35 PM, David Lyon <david.lyon at preisshare.net> wrote:
> On Tue, 19 May 2009 13:53:18 +0900, David Cournapeau <cournape at gmail.com>
> wrote:
>> Given that nobody has managed to solve this problem, I doubt you will
>> find a solution.
>
> It is solved in other languages.. for example perl.. and delphi

I don't know much about perl, and even less about delphi, but I am
pretty sure it does not solve the problem of overwriting files from a
package with an installation outside the control of the package
manager.

There is no simple solution to the following situation:
   - install setuptools from ubuntu -> files get into /usr
(/usr/lib/python2.5/site-packages, etc...)
   - install setuptools from sources into /usr: overwrite files from
the python-setuptools debian package, with an updated version which is
not compatible with the packaged one -> every Ubuntu package depending
on setuptools is now broken. Worse, it may not be possible to rollback
to a working situation.

To make it work, you would have to somehow notify the package
management system about the updated version. But still, the whole
value of a package manager is to have a whole set of packages which
are tested together. Updating packages 'randomly' from 3rd party
sources is inherently against this.

> Fight it ??? I didn't even get a python interpreter with my operating
> system...
>
> So there's no possible way I can be against it...

By fighting, I meant that because OS don't always have uptodate
packages you want to depend on, trying to implement a system to update
the packages is backward. The problem is depending on those recent
libraries in the first place if you want to run on many
configurations.

cheers,

David


From sasurve at gmail.com  Tue May 19 02:51:20 2009
From: sasurve at gmail.com (shruti surve)
Date: Tue, 19 May 2009 12:21:20 +0530
Subject: issue: Permissions in odfpy
Message-ID: <862e00220905182351k3ec16f8dnc7841d7e749ff743@mail.gmail.com>

hey,
i am using odfpy and  generating spreadsheet in open office..but nobody
should modify the file..so can anybody tell me how can we give permissions
(read only) to spreadsheet in odfpy??..i have change the properties of my
normal open office spreadsheet file and made it read only..n also extracted
it..but in conteny.xml also i am not finding any property which can be used
in odfpy...so please give me some solution..


regards
shruti surve
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From henning.vonbargen at arcor.de  Tue May 19 03:11:04 2009
From: henning.vonbargen at arcor.de (henning.vonbargen at arcor.de)
Date: Tue, 19 May 2009 00:11:04 -0700 (PDT)
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
References: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>
	<51d1dd3f-322d-47fa-9d44-75b92c6ef4e2@e20g2000vbc.googlegroups.com> 
	<2003c02c-6a9f-40fb-b19c-30625ed09eb0@s21g2000vbb.googlegroups.com>
Message-ID: <fc58e391-7979-4220-b6c9-a06c23ee4dbb@21g2000vbk.googlegroups.com>

Daniel:
> What do you get with:
> import thread
> thread.start_new_thread(int, ('1',2))
>

This results in the same error message:
thread.error: can't start new thread

Aahz:
> You probably want to start by figuring out which threading library is
> being used -- Python normally wants Posix threads, but IIRC, that's not
> the default on HP-UX, and you may need to fix the build process to use
> Posix.

You're probably right, but I'm lost here, since I'm neither a *nix nor
a HP-UX expert in building software from source. I'm used to
"configure; make; make install", which usually works well on other
platforms...

Henning


From dstanek at dstanek.com  Tue May 19 03:32:01 2009
From: dstanek at dstanek.com (David Stanek)
Date: Tue, 19 May 2009 03:32:01 -0400
Subject: strip char from list of strings
In-Reply-To: <195055.64779.qm@web54204.mail.re2.yahoo.com>
References: <195055.64779.qm@web54204.mail.re2.yahoo.com>
Message-ID: <de32cc030905190032o3e392314o9ee2944f9d99255a@mail.gmail.com>

On Mon, May 18, 2009 at 3:30 PM, Laurent Luce <laurentluce49 at yahoo.com> wrote:
>
> I have the following list:
>
> [ 'test\n', test2\n', 'test3\n' ]
>
> I want to remove the '\n' from each string in place, what is the most efficient way to do that ?
>

What have you tried so far?

-- 
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek


From mail at timgolden.me.uk  Tue May 19 03:37:44 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 19 May 2009 08:37:44 +0100
Subject: Subversion commit from Python?
In-Reply-To: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
Message-ID: <4A1261C8.1000707@timgolden.me.uk>

Jack Trades wrote:
> I'm wondering if there's an easy way to do a 'svn commit' on a
> directory from Python.
> 

  http://pysvn.tigris.org/

and in particular:

  http://pysvn.tigris.org/docs/pysvn_prog_guide.html

TJG


From duncan.booth at invalid.invalid  Tue May 19 03:46:42 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 19 May 2009 07:46:42 GMT
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
Message-ID: <Xns9C1058657406Dduncanbooth@127.0.0.1>

Jack Trades <JackTradesPublic at gmail.com> wrote:

> Originally I had the 'data' directory in the same directory as the cgi
> scripts and was using os.system("svn commit"), however I kept running
> into weird bugs with this method.  So I moved the data directory out
> of the cgi directory and plan to use a separate repository.  So is
> there a prefered way to commit this directory to a subversion
> repository from a Python script?

Subversion has Python bindings, but for a friendlier interface have a look 
at http://pysvn.tigris.org/

An example from the docs at 
http://pysvn.tigris.org/docs/pysvn_prog_guide.html:

Commit changes to the repository

import pysvn
# edit the file foo.txt
f = open('./examples/pysvn/foo.txt', 'w')
f.write('Sample versioned file via python\n')
f.close()
# checkin the change with a log message
client = pysvn.Client()
client.checkin(['./examples/pysvn'], 'Corrected spelling of python in foo.txt')

-- 
Duncan Booth http://kupuguy.blogspot.com


From ldo at geek-central.gen.new_zealand  Tue May 19 03:53:06 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 19 May 2009 19:53:06 +1200
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<gutcdg$3st$4@lust.ihug.co.nz>
	<ac63e27e-2dd9-4c27-ace0-d9e205be7afa@s31g2000vbp.googlegroups.com>
Message-ID: <gutoh2$b0a$1@lust.ihug.co.nz>

In message <ac63e27e-2dd9-4c27-ace0-
d9e205be7afa at s31g2000vbp.googlegroups.com>, Jack Trades wrote:

> On May 19, 12:26 am, Lawrence D'Oliveiro <l... at geek-
> central.gen.new_zealand> wrote:
>
>> In message <2904e7de-0a8d-4697-9c44-
>>
>> c83bb5319... at s31g2000vbp.googlegroups.com>, Jack Trades wrote:
>> > Originally I had the 'data' directory in the same directory as the cgi
>> > scripts and was using os.system("svn commit"), however I kept running
>> > into weird bugs with this method.
>>
>> What bugs?
> 
> I'm not 100% sure, but I think it had to do with executable
> permissions on the cgi scripts.

Possibly your CGI scripts are running as some user like "nobody", which 
doesn't have the right access to the files/directories. Changing APIs won't 
help here.



From duncan.booth at invalid.invalid  Tue May 19 03:56:51 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 19 May 2009 07:56:51 GMT
Subject: Context manager, atexit processing,
	and PEP 3143 	DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>
	<87hbzk8eoh.fsf@benfinney.id.au>
	<ab4fa3490905181014v11bb0746p2f81f3a00dac9b8a@mail.gmail.com>
	<mailman.343.1242668632.8015.python-list@python.org>
	<87my9a6qfm.fsf@benfinney.id.au>
Message-ID: <Xns9C105A39B441Dduncanbooth@127.0.0.1>

Ben Finney <ben+python at benfinney.id.au> wrote:

> MRAB <google at mrabarnett.plus.com> writes:
> 
>> Gunter Henriksen wrote:
>> > If there is a function which triggers a one-shot switch, I like to
>> > have a way to find out if it has already been triggered, I prefer
>> > to have the function tell me if it triggered the switch or not, but
>> > I would not want that to be by raising an exception.
>> 
>> The 'file' class also has a 'closed' method, so that's a good model
>> to follow.
> 
> Yes, I find that convincing as well. (I might prefer it to instead
> answer the question ???is it currently open????, i.e. an ???opened???
> query, but that makes for more awkward English than ???closed???.)
> 
In the general case you might have an object which you create then open as 
an explicit step. Later you close it explicitly before it is discarded. In 
that case methods 'opened' and 'closed' both make sense but mean different 
things. For a file object, where construction always opens the file, an 
opened method (if it existed) should always return true so isn't useful.

Or in other words, I take the word 'opened' as meaning 'has been opened' 
which is not the same as 'is currently open'.

-- 
Duncan Booth http://kupuguy.blogspot.com


From hackingkk at gmail.com  Tue May 19 03:57:48 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Tue, 19 May 2009 13:27:48 +0530
Subject: issue: Permissions in odfpy
In-Reply-To: <862e00220905182351k3ec16f8dnc7841d7e749ff743@mail.gmail.com>
References: <862e00220905182351k3ec16f8dnc7841d7e749ff743@mail.gmail.com>
Message-ID: <1242719868.7276.16.camel@kk-laptop>

Through the python code,
chmod 400 <filename.ods>
happy hacking.
Krishnakant.

On Tue, 2009-05-19 at 12:21 +0530, shruti surve wrote:
> hey,
> i am using odfpy and  generating spreadsheet in open office..but
> nobody should modify the file..so can anybody tell me how can we give
> permissions (read only) to spreadsheet in odfpy??..i have change the
> properties of my normal open office spreadsheet file and made it read
> only..n also extracted it..but in conteny.xml also i am not finding
> any property which can be used in odfpy...so please give me some
> solution..
> 
> 
> regards
> shruti surve



From stablum at gmail.com  Tue May 19 04:09:32 2009
From: stablum at gmail.com (Francesco Stablum)
Date: Tue, 19 May 2009 10:09:32 +0200
Subject: problems with PyML: ImportError: No module named _ckernel
Message-ID: <377fd1f30905190109l6ab99c3cre6df335179d96798@mail.gmail.com>

Hello,
I am trying PyML ( http://PyML.sf.net ) with little success.
I tried to do the test: from PyML.demo import pyml_test

but all I got is that backtrace:
Traceback (most recent call last):
  File "./test.py", line 2, in <module>
    from PyML.demo import pyml_test
  File "/usr/src/PyML-0.7.2/PyML/__init__.py", line 4, in <module>
    from PyML.containers import *
  File "/usr/src/PyML-0.7.2/PyML/containers/__init__.py", line 3, in <module>
    VectorDataSet = __import__('PyML.containers.vectorDatasets',
fromlist=['']).VectorDataSet
  File "PyML/containers/vectorDatasets.py", line 4, in <module>
    from PyML.containers.baseDatasets import WrapperDataSet, BaseVectorDataSet
  File "PyML/containers/baseDatasets.py", line 4, in <module>
    from PyML.containers import ker
  File "PyML/containers/ker.py", line 6, in <module>
    from ext import ckernel
  File "PyML/containers/ext/ckernel.py", line 7, in <module>
    import _ckernel
ImportError: No module named _ckernel

Actually,  in the directory

/usr/lib/python2.5/site-packages/PyML/containers/ext/

there is the file _ckernel.so

and, if I do:
import _ckernel
in that directory, no problem happens.

Actually, there is a report for this bug:
http://sourceforge.net/forum/forum.php?thread_id=2167098&forum_id=393034
but nobody answered.

any ideas?
thanks in advance,
Francesco Stablum

-- 
The generation of random numbers is too important to be left to chance
- Robert R. Coveyou


From jeremiah.dodds at gmail.com  Tue May 19 04:09:49 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Tue, 19 May 2009 09:09:49 +0100
Subject: strip char from list of strings
In-Reply-To: <195055.64779.qm@web54204.mail.re2.yahoo.com>
References: <195055.64779.qm@web54204.mail.re2.yahoo.com>
Message-ID: <12cbbbfc0905190109m1aa45142r83fd7ceb4c9d8e93@mail.gmail.com>

On Mon, May 18, 2009 at 8:30 PM, Laurent Luce <laurentluce49 at yahoo.com>wrote:

>
> I have the following list:
>
> [ 'test\n', test2\n', 'test3\n' ]
>
> I want to remove the '\n' from each string in place, what is the most
> efficient way to do that ?
>
> Regards,
>
> Laurent
> --
> http://mail.python.org/mailman/listinfo/python-list
>


>>> s = [ 'test\n', test2\n', 'test3\n' ]
>>> [i.strip() for i in s]

['test', 'test2', 'test3']

>>> map(str.strip, s)

['test', 'test2', 'test3']


I'm not sure which one of these is more efficient, but it probably doesn't
really matter.
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From marco at sferacarta.com  Tue May 19 04:16:31 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Tue, 19 May 2009 10:16:31 +0200
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
In-Reply-To: <mailman.368.1242712875.8015.python-list@python.org>
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>	<gutcur$47g$2@lust.ihug.co.nz>
	<mailman.368.1242712875.8015.python-list@python.org>
Message-ID: <zVtQl.19140$Ux.11467@tornado.fastwebnet.it>

Chris Rebert wrote:

>>> On the other hand there are developers who much prefer to keep things
>>> light-weight and simple.
>> Would it be fair to say the first type tends to congregate in herds,
>> particularly in corporate IT departments, while the latter tends to operate
>> on a more individual basis?
> 
> That would certainly explain Lisp hackers!
> *(ducks)*

Oh, come on!

Corporate environments are usually positive towards Lisp hackers, and 
Lisp hackers are OTOH very positive towards corporate environments.
That's why they repel.



From piet at cs.uu.nl  Tue May 19 04:25:35 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Tue, 19 May 2009 10:25:35 +0200
Subject: strip char from list of strings
References: <mailman.371.1242718187.8015.python-list@python.org>
Message-ID: <m263fxcxds.fsf@cs.uu.nl>

>>>>> Laurent Luce <laurentluce49 at yahoo.com> (LL) wrote:

>LL> I have the following list:

>LL> [ 'test\n', test2\n', 'test3\n' ]

>LL> I want to remove the '\n' from each string in place, what is the
>LL> most efficient way to do that ? 

I suppose you mean you have lists similar to the one given because with
a list of 3 elements efficiency is a non-issue unless you do something
stupid or repeat the operation thousands of times. Even with a list of
1000 elements efficiency isn't very important. In fact you should worry
about efficiency only after there are signs that there might be a
problem. 

Secondly, in Python you cannot remove a character from a string in place
if that means modifying the string. Strings are immutable. So let us
suppose you mean that the list should stay in place, i.e if L is the
list that after the operation L is still the same object but L[i]
has become a string that has the value of the old L[i] with the '\n'
removed. Let us also suppose that in the original list every element has
exactly one '\n' at the end.

Then a simple loop should do it. The enumerate comes to mind as you need
both the index and the value of each element:

for i, value in enumerate(L):
    L[i] = value[:-1]

But it looks a bit silly to me to refer to the same list element as both
value and L[i]. So maybe the old-fashioned way is more clear:

for i in range(len(L)):
    L[i] = L[i][:-1]

I think the choice is a matter of taste. You can do some timing
experiments yourself to see if there are significant differences, but I
wouldn't expect so.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From ben+python at benfinney.id.au  Tue May 19 04:27:37 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Tue, 19 May 2009 18:27:37 +1000
Subject: Context manager, atexit processing,
	and PEP 3143  DaemonContext.close
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>
	<87hbzk8eoh.fsf@benfinney.id.au>
	<mailman.342.1242666875.8015.python-list@python.org>
Message-ID: <87fxf17b0m.fsf@benfinney.id.au>

Gunter Henriksen <gunterhenriksen at gmail.com> writes:

> If there is a function which triggers a one-shot switch, I like to
> have a way to find out if it has already been triggered, I prefer to
> have the function tell me if it triggered the switch or not, but I
> would not want that to be by raising an exception.

In this case, though, we're talking about a class intended to implement
the context manager API (in addition to other API).

So, following your argument above, we might expect a generic context
manager object to be able to tell us whether we're currently inside that
context or not. Does such a thing exist?

-- 
 \       ?If consumers even know there's a DRM, what it is, and how it |
  `\     works, we've already failed.? ?Peter Lee, Disney corporation, |
_o__)                                                             2005 |
Ben Finney


From steven at REMOVE.THIS.cybersource.com.au  Tue May 19 05:24:29 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 19 May 2009 09:24:29 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
Message-ID: <pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>

On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:

> Let me clarify what I think par, pmap, pfilter and preduce would mean
> and how they would be implemented. 
[...]

Just for fun, I've implemented a parallel-map function, and done a couple 
of tests. Comments, criticism and improvements welcome!



import threading
import Queue
import random
import time

def f(arg):  # Simulate a slow function.
    time.sleep(0.5)
    return 3*arg-2


class PMapThread(threading.Thread):
    def __init__(self, clients):
        super(PMapThread, self).__init__()
        self._clients = clients
    def start(self):
        super(PMapThread, self).start()
    def run(self):
        while True:
            try:
                data = self._clients.get_nowait()
            except Queue.Empty:
                break
            target, where, func, arg = data
            result = func(arg)
            target[where] = result


class VerbosePMapThread(threading.Thread):
    def __init__(self, clients):
        super(VerbosePMapThread, self).__init__()
        print "Thread %s created at %s" % (self.getName(), time.ctime())
    def start(self):
        super(VerbosePMapThread, self).start()
        print "Thread %s starting at %s" % (self.getName(), time.ctime())
    def run(self):
        super(VerbosePMapThread, self).run()
        print "Thread %s finished at %s" % (self.getName(), time.ctime())


def pmap(func, seq, verbose=False, numthreads=4):
    size = len(seq)
    results = [None]*size
    if verbose:
        print "Initiating threads"
        thread = VerbosePMapThread
    else:
        thread = PMapThread
    datapool = Queue.Queue(size)
    for i in xrange(size):
        datapool.put( (results, i, f, seq[i]) )
    threads = [PMapThread(datapool) for i in xrange(numthreads)]
    if verbose:
        print "All threads created."
    for t in threads:
        t.start()
    # Block until all threads are done.
    while any([t.isAlive() for t in threads]):
        if verbose:
            time.sleep(0.25)
            print results
    return results


And here's the timing results:

>>> from timeit import Timer
>>> setup = "from __main__ import pmap, f; data = range(50)"
>>> min(Timer('map(f, data)', setup).repeat(repeat=5, number=3))
74.999755859375
>>> min(Timer('pmap(f, data)', setup).repeat(repeat=5, number=3))
20.490942001342773



-- 
Steven


From terminatorul at gmail.com  Tue May 19 05:54:54 2009
From: terminatorul at gmail.com (Timothy Madden)
Date: Tue, 19 May 2009 05:54:54 -0400
Subject: python3 module for dbus ?
Message-ID: <4a1281ef$0$90271$14726298@news.sunsite.dk>

Hello

Sorry if this is not the right newsgroup for python modules, I found no 
other appropriate one.

I would like to start a project in python and I think it would be good 
to start with python3.0, but I need tu use glib, dbus, wxWidgets and 
postgresql.

Do you know if I can get dbus bindings for python3 and glib bindings for 
python3 ? Or could I use them otherwise (like without the modules) ?

Thank you
Timothy Madden


From grante at visi.com  Tue May 19 06:47:04 2009
From: grante at visi.com (Grant Edwards)
Date: Tue, 19 May 2009 05:47:04 -0500
Subject: UDP reading on multiple sockets
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net>
	<15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>
	<27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
Message-ID: <bemdncqkNYS1E4_XnZ2dnUVZ_gZi4p2d@posted.usinternet>

On 2009-05-18, thomas.vogel at likeabird.de <thomas.vogel at likeabird.de> wrote:
> On 17 Mai, 04:22, Grant Edwards <gra... at visi.com> wrote:
>> On 2009-05-17, Thomas Vogel <thomas.vo... at likeabird.de> wrote:
>>
>> > I'm currently have the problem that I try to read UDP messages from
>> > multiple sockets in parallel. So let's say I get UDP packets from the
>> > same IP on the ports 2000, 2001, 2002,...
>>
>> Is there any reason you can't do it the easy way by using
>> select?
>>
>> http://docs.python.org/library/select.html
>
> The only honest answer would be that I'm totaly unfamiliar
> with select and also the documentation I found wasn't able to
> clear the picture. So are there examples of using select
> together with sockets available?

http://www.google.com/search?q=python+select+example

http://www.amk.ca/python/howto/sockets/
http://code.activestate.com/recipes/531824/
http://mail.python.org/pipermail/python-list/2001-February/071302.html
http://squirl.nightmare.com/medusa/async_sockets.html

-- 
Grant



From grante at visi.com  Tue May 19 06:52:04 2009
From: grante at visi.com (Grant Edwards)
Date: Tue, 19 May 2009 05:52:04 -0500
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
Message-ID: <bemdncWkNYTJEo_XnZ2dnUVZ_gZi4p2d@posted.usinternet>

On 2009-05-19, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:
>
>> Let me clarify what I think par, pmap, pfilter and preduce would mean
>> and how they would be implemented. 
> [...]
>
> Just for fun, I've implemented a parallel-map function, and done a couple 
> of tests. Comments, criticism and improvements welcome!

My only comment would be that your "slow function" might not be
a very simulation for the general-case, since it uses
time.sleep() which releases the GIL:

> def f(arg):  # Simulate a slow function.
>     time.sleep(0.5)
>     return 3*arg-2

Any Python function that isn't calling a library function
written in C that releases the GIL won't show any speedup will
it?  I don't have a multi-core machine to try it on, but what
happens when you replace your "slow function" code with
something that actually burns CPU using pure-Python code
instead of blocking on a timer in the OS?

-- 
Grant



From jeremy at martinfamily.freeserve.co.uk  Tue May 19 06:57:43 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Tue, 19 May 2009 03:57:43 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
Message-ID: <d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>

On 19 May, 00:32, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:
> > However I *do* actually want to add syntax to the language. I think that
> > 'par' makes sense as an official Python construct - we already have had
> > this in the Occam programming language for twenty-five years. The reason
> > for this is ease of use. I would like to make it easy for amateur
> > programmers to exploit natural parallelism in their algorithms. For
> > instance somebody who wishes to calculate a property of each member from
> > a list of chemical structures using the Python Daylight interface: with
> > my suggestion they could potentially get a massive speed up just by
> > changing 'for' to 'par' or 'map' to 'pmap'. (Or map with a parallel
> > keyword argument set as suggested). At present they would have to
> > manually chop up their work and run it as multiple processes in order to
> > achieve the same - fine for expert programmers but not reasonable for
> > people working in other domains who wish to use Python as a utility
> > because of its fantastic productivity and ease of use.
>
> There seems to be some discrepancy between this, and what you wrote in
> your first post:
>
> "There would be no locking and it would be the programmer's
> responsibility to ensure that the loop was truly parallel and correct."
>
> So on the one hand, you want par to be utterly simple-minded and to do no
> locking. On the other hand you want it so simple to use that amateurs can
> mechanically replace 'for' with 'par' in their code and everything will
> Just Work, no effort or thought required. But those two desires are
> inconsistent.
>
> Concurrency is an inherently complicated problem: deadlocks and race
> conditions abound, and are notoriously hard to reproduce, let alone
> debug. If par is simple, and does no locking, then the programmer needs
> to worry about those complications. If you want programmers to ignore
> those complications, either (1) par needs to be very complicated and
> smart, to do the Right Thing in every case, or (2) you're satisfied if
> par produces buggy code when used in the fashion you recommend.
>
> The third option is, make par really simple and put responsibility on the
> user to write code which is concurrent. I think that's the right
> solution, but it means a simplistic "replace `for` with `par` and your
> code will run faster" will not work. It might run faster three times out
> of five, but the other two times it will hang in a deadlock, or produce
> incorrect results, or both.
>
> --
> Steven

Hi Steven,

> you want it so simple to use that amateurs can mechanically replace 'for' with 'par' in their
> code and everything will Just Work, no effort or thought required.

Yes I do want the par construction to be simple, but of course you
can't just replace a for loop with a par loop in the general case.
This issue arises when people use OpenMP: you can take a correct piece
of code, add a comment to indicate that a loop is 'parallel', and if
you get it wrong the code with no longer work correctly. With my 'par'
construct the programmer's intention is made explicit in the code,
rather than by a compiler directive and so I think that is clearer
than OpenMP.

As I wrote before, concurrency is one of the hardest things for
professional programmers to grasp. For 'amateur' programmers we need
to make it as simple as possible, and I think that a parallel loop
construction and the dangers that lurk within would be reasonably
straightforward to explain: there are no locks to worry about, no
message passing. The only advanced concept is the 'sync' keyword,
which would be used to rendezvous all the threads. That would only be
used to speed up certain codes in order to avoid having to repeatedly
shut down and start up gangs of threads.

Jeremy


From jeremy at martinfamily.freeserve.co.uk  Tue May 19 07:05:48 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Tue, 19 May 2009 04:05:48 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com> 
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com> 
	<a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com>
Message-ID: <349328ba-e396-46aa-ac4b-ae5d7c2796a9@v17g2000vbb.googlegroups.com>

On 19 May, 03:31, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 18, 1:52?pm, jer... at martinfamily.freeserve.co.uk wrote:
>
> > As I understand it the reason for the GIL is to prevent problems with
> > garbage collection in multi-threaded applications.
>
> Not really. ?It's main purpose to prevent context switches from
> happening in the middle of some C code (essentially it makes all C
> code a "critical" section, except when the C code explicitly releases
> the GIL). ?This tremendously simplifies the task of writing extension
> modules, not to mention the Python core.
>
> > Without it the
> > reference count method is prone to race conditions. However it seems
> > like a fairly crude mechanism to solve this problem. Individual
> > semaphores could be used for each object reference counter, as in
> > Java.
>
> Java doesn't use reference counting.
>
> Individual locks on the refcounts would be prohibitively expensive in
> Python, a cost that Java doesn't have.
>
> Even if you decided to accept the penalty and add locking to
> refcounts, you still have to be prepared for context switching at any
> time when writing C code, which means in practice you have to lock any
> object that's being accessed--that's in addition to the refcount lock.
>
> I am not disagreeing with your assessment in general, it would be
> great if Python were better able to take advantage of multiple cores,
> but it's not as simple a thing as you're making it out to be.
>
> Carl Banks

Hi Carl,

> I am not disagreeing with your assessment in general, it would be
> great if Python were better able to take advantage of multiple cores,
> but it's not as simple a thing as you're making it out to be.

Thanks for explaining a few things to me. So it would seem that
replacing the GIL with something which allows better scalability of
multi-threaded applications, would be very complicated. The paper by
Jesse Nolle which I referenced in my original posting includes the
following:

"In 1999 Greg Stein created a patch set for the interpreter that
removed the GIL, but added granular locking around sensitive
interpreter operations. This patch set had the direct effect of
speeding up threaded execution, but made single threaded execution two
times slower."

Source: http://jessenoller.com/2009/02/01/python-threads-and-the-global-interpreter-lock/

That was ten years ago - do you have any idea as to how things have
been progressing in this area since then?

Jeremy


From totobe at gmail.com  Tue May 19 07:13:04 2009
From: totobe at gmail.com (wdveloper)
Date: Tue, 19 May 2009 04:13:04 -0700 (PDT)
Subject: Best library to make XSLT 2.0 transformation
Message-ID: <7fa6e7f2-00ae-4b9b-86a2-0ce62b9914d1@q14g2000vbn.googlegroups.com>

Hi there,

I need to make xml transformation using XSLT 2.0 (since i want to use
the powerful tag <xsl:result-document> to produce multiple files).
In your experience, which kind of library out there is better?

Thanks!


From google at mrabarnett.plus.com  Tue May 19 07:37:35 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 19 May 2009 12:37:35 +0100
Subject: Context manager, atexit processing,
	and PEP 3143 	DaemonContext.close
In-Reply-To: <Xns9C105A39B441Dduncanbooth@127.0.0.1>
References: <87bppsa6y8.fsf@benfinney.id.au>	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>	<87tz3k8lfc.fsf@benfinney.id.au>	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>	<87hbzk8eoh.fsf@benfinney.id.au>	<ab4fa3490905181014v11bb0746p2f81f3a00dac9b8a@mail.gmail.com>	<mailman.343.1242668632.8015.python-list@python.org>	<87my9a6qfm.fsf@benfinney.id.au>
	<Xns9C105A39B441Dduncanbooth@127.0.0.1>
Message-ID: <4A1299FF.90100@mrabarnett.plus.com>

Duncan Booth wrote:
> Ben Finney <ben+python at benfinney.id.au> wrote:
> 
>> MRAB <google at mrabarnett.plus.com> writes:
>>
>>> Gunter Henriksen wrote:
>>>> If there is a function which triggers a one-shot switch, I like to
>>>> have a way to find out if it has already been triggered, I prefer
>>>> to have the function tell me if it triggered the switch or not, but
>>>> I would not want that to be by raising an exception.
>>> The 'file' class also has a 'closed' method, so that's a good model
>>> to follow.
>> Yes, I find that convincing as well. (I might prefer it to instead
>> answer the question ???is it currently open????, i.e. an ???opened???
>> query, but that makes for more awkward English than ???closed???.)
>>
> In the general case you might have an object which you create then open as 
> an explicit step. Later you close it explicitly before it is discarded. In 
> that case methods 'opened' and 'closed' both make sense but mean different 
> things. For a file object, where construction always opens the file, an 
> opened method (if it existed) should always return true so isn't useful.
> 
> Or in other words, I take the word 'opened' as meaning 'has been opened' 
> which is not the same as 'is currently open'.
> 
Equally you could say that "closed" means "has been closed", which is
not the same as "is currently closed". Unusual, but possible! :-)

Borrowing from the string class, it would be "isopen" (like "isdigit",
probably influenced by C), although these days we would write "is_open".


From deets at nospam.web.de  Tue May 19 07:42:32 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 19 May 2009 13:42:32 +0200
Subject: Best library to make XSLT 2.0 transformation
References: <7fa6e7f2-00ae-4b9b-86a2-0ce62b9914d1@q14g2000vbn.googlegroups.com>
Message-ID: <77fk56F1fg5c6U1@mid.uni-berlin.de>

wdveloper wrote:

> Hi there,
> 
> I need to make xml transformation using XSLT 2.0 (since i want to use
> the powerful tag <xsl:result-document> to produce multiple files).
> In your experience, which kind of library out there is better?

XSLT is a standard, so if you find a library that implements it, there
shouldn't be much differences.

Having said that, these days lxml2 is the craze, and it contains
xslt-processing. It would be my first (and hopefully last) stop.

Diez


From Caseyweb at gmail.com  Tue May 19 08:13:28 2009
From: Caseyweb at gmail.com (Casey Webster)
Date: Tue, 19 May 2009 05:13:28 -0700 (PDT)
Subject: strip char from list of strings
References: <mailman.371.1242718187.8015.python-list@python.org>
Message-ID: <e2c96842-552a-41d3-80c7-818d5ec09084@f16g2000vbf.googlegroups.com>

On May 18, 3:30?pm, Laurent Luce <laurentluc... at yahoo.com> wrote:
> I have the following list:
>
> [ 'test\n', test2\n', 'test3\n' ]
>
> I want to remove the '\n' from each string in place, what is the most efficient way to do that ?
>
> Regards,
>
> Laurent

Do you _really_ need to do this in place?  If not, the simplest answer
is probably:

>>> x = ['test\n', test2\n', 'test3\n']
>>> x = [s.rstrip('\n') for s in x]

And if what you really want to do is strip off all trailing whitespace
(tabs, spaces, and newlines), then:

>>> x = [s.rstrip() for s in x]

A quick test of 1,000,000 strings of length 27 took less than 0.2
seconds on my PC.  Efficiency isn't really much of an issue for most
data sets.


From darcy at druid.net  Tue May 19 08:20:13 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Tue, 19 May 2009 08:20:13 -0400
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
	<loom.20090518T151856-387@post.gmane.org>
	<8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com>
Message-ID: <20090519082013.65fba203.darcy@druid.net>

On Tue, 19 May 2009 10:51:57 +0530
Kalyan Chakravarthy <kalyanchakravarthy at hyit.com> wrote:
> Actually my requirement is
> in an web application when user enters User name and Password,
> back end i needs to check, is it they entered correct user name with
> password ( here i want to read the Spread Sheet Data in Python code  ),
> for this i will keep all the user names and passwords in Google Spread Sheet

I can't answer your question about reading Google spreadsheets but I do
wonder why you are trying to solve a database problem with a
spreadsheet in the first place, especially with all the support Python
has for database access.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From phihag at phihag.de  Tue May 19 08:27:11 2009
From: phihag at phihag.de (Philipp Hagemeister)
Date: Tue, 19 May 2009 14:27:11 +0200
Subject: identifying live hosts on a network
In-Reply-To: <069f821d-1b73-4ed9-b298-09e7c0548122@p6g2000pre.googlegroups.com>
References: <069f821d-1b73-4ed9-b298-09e7c0548122@p6g2000pre.googlegroups.com>
Message-ID: <4A12A59F.4080107@phihag.de>

We acknowledge your problems with a network script idenifying live hosts
on your network.

Seriously, you have to tell us a little bit more so that we can help
you. How about you actually post the script, and actually post the
trouble (What exactly do you expect? What exactly do you see? What other
steps have you tried?)

Philipp

hunteroakesgun at gmail.com wrote:
> HI
> I am new to python and am having trouble coming up with a script that
> idenifies all the live hosts on my network.
> thanks Hunter



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From a.cavallo at cavallinux.eu  Tue May 19 08:29:47 2009
From: a.cavallo at cavallinux.eu (A. Cavallo)
Date: Tue, 19 May 2009 13:29:47 +0100
Subject: Package problem
In-Reply-To: <5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
	<5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
Message-ID: <200905191329.48531.a.cavallo@cavallinux.eu>

> > It is solved in other languages.. for example perl.. and delphi
> I don't know much about perl, and even less about delphi, but I am
> pretty sure it does not solve the problem of overwriting files from a
> package with an installation outside the control of the package
> manager.

On a sytem a possible solution would be:

 /usr/lib/python2.5/site-package/foobar <- The os managed one
 /usr/lib/python2.5/site-package/foobar-2.0 <- The alternatives
 /usr/lib/python2.5/site-package/foobar-2.1 

and using something (in the python interpreter)

import foobar (imports the foobar)
import foobar requires >= 2.1 (imports foobar 2.1 or above)

>
> There is no simple solution to the following situation:
>    - install setuptools from ubuntu -> files get into /usr
> (/usr/lib/python2.5/site-packages, etc...)

setuptools is the problem;) It tries to do too many things imho.

> > Fight it ??? I didn't even get a python interpreter with my operating
> > system...

You could try:

http://download.opensuse.org/repositories/home:/cavallo71:/python-opt/

This is a python interpreter installed under /opt/opt-python-2.7a0.
All you have to do is sourcing /opt/opt-python-2.7a0/opt-python-env.sh
from a shell and start using the python 2.7 (it's directly from the svn 
trunk).

If you download a python module to generate the rpm for it all you have to do 
is:
$> . /opt/opt-python-2.7a0/opt-python-env.sh
$> python setup.py bdist_rpm 

It will generate a package rpm installable under /opt/python-2.7a0 and won't 
interfere with the system.

I hope this will help,
Regards,
Antonio







From benjamin.kaplan at case.edu  Tue May 19 08:43:48 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 19 May 2009 08:43:48 -0400
Subject: Package problem
In-Reply-To: <5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
	<39468261f5a617fdea45101268b7be6c@preisshare.net>
	<5b8d13220905182153j490f4826kf2b21422de901210@mail.gmail.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
	<5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
Message-ID: <ec96e1390905190543q3bd62826t4e172f6ce5704997@mail.gmail.com>

On Tue, May 19, 2009 at 2:45 AM, David Cournapeau <cournape at gmail.com>wrote:

> On Tue, May 19, 2009 at 2:35 PM, David Lyon <david.lyon at preisshare.net>
> wrote:
> > On Tue, 19 May 2009 13:53:18 +0900, David Cournapeau <cournape at gmail.com
> >
> > wrote:
> >> Given that nobody has managed to solve this problem, I doubt you will
> >> find a solution.
> >
> > It is solved in other languages.. for example perl.. and delphi
>
> I don't know much about perl, and even less about delphi, but I am
> pretty sure it does not solve the problem of overwriting files from a
> package with an installation outside the control of the package
> manager.
>
> There is no simple solution to the following situation:
>   - install setuptools from ubuntu -> files get into /usr
> (/usr/lib/python2.5/site-packages, etc...)
>   - install setuptools from sources into /usr: overwrite files from
> the python-setuptools debian package, with an updated version which is
> not compatible with the packaged one -> every Ubuntu package depending
> on setuptools is now broken. Worse, it may not be possible to rollback
> to a working situation.
>
> To make it work, you would have to somehow notify the package
> management system about the updated version. But still, the whole
> value of a package manager is to have a whole set of packages which
> are tested together. Updating packages 'randomly' from 3rd party
> sources is inherently against this.
>

Actually, the point in the package manager is to handle updates and
uninstalls gracefully. As long as you stick with using the package manager,
everything should be handled fine regardless of whether you're using an
official repository, a third party repository (wxPython has its own), or a
downloaded debian package (such as with OpenOffice).


> > Fight it ??? I didn't even get a python interpreter with my operating
> > system...
> >
> > So there's no possible way I can be against it...
>
> By fighting, I meant that because OS don't always have uptodate
> packages you want to depend on, trying to implement a system to update
> the packages is backward. The problem is depending on those recent
> libraries in the first place if you want to run on many
> configurations.
>

I think other-David was talking about Windows here. Which is completely
irrelevant to this thread about easy_install vs. a system package manager.
Mostly, he was just trying to plug for his own project.


>
> cheers,
>
> David
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From aahz at pythoncraft.com  Tue May 19 08:57:34 2009
From: aahz at pythoncraft.com (Aahz)
Date: 19 May 2009 05:57:34 -0700
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
References: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>
	<51d1dd3f-322d-47fa-9d44-75b92c6ef4e2@e20g2000vbc.googlegroups.com>
	<2003c02c-6a9f-40fb-b19c-30625ed09eb0@s21g2000vbb.googlegroups.com>
	<fc58e391-7979-4220-b6c9-a06c23ee4dbb@21g2000vbk.googlegroups.com>
Message-ID: <guuabu$9ie$1@panix3.panix.com>

In article <fc58e391-7979-4220-b6c9-a06c23ee4dbb at 21g2000vbk.googlegroups.com>,
 <henning.vonbargen at arcor.de> wrote:
>Aahz:
>>
>> You probably want to start by figuring out which threading library is
>> being used -- Python normally wants Posix threads, but IIRC, that's not
>> the default on HP-UX, and you may need to fix the build process to use
>> Posix.
>
>You're probably right, but I'm lost here, since I'm neither a *nix nor
>a HP-UX expert in building software from source. I'm used to
>"configure; make; make install", which usually works well on other
>platforms...

Try finding a usergroup/list for HP, you will probably have better luck
there.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From exarkun at divmod.com  Tue May 19 09:11:13 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Tue, 19 May 2009 09:11:13 -0400
Subject: UDP reading on multiple sockets
In-Reply-To: <27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
Message-ID: <20090519131113.21531.1412825823.divmod.quotient.23270@henry.divmod.com>

On Mon, 18 May 2009 06:19:01 -0700 (PDT), thomas.vogel at likeabird.de wrote:
>On 17 Mai, 04:22, Grant Edwards <gra... at visi.com> wrote:
>> On 2009-05-17, Thomas Vogel <thomas.vo... at likeabird.de> wrote:
>>
>> > I'm currently have the problem that I try to read UDP messages from
>> > multiple sockets in parallel. So let's say I get UDP packets from the
>> > same IP on the ports 2000, 2001, 2002,...
>>
>> Is there any reason you can't do it the easy way by using
>> select?
>>
>> http://docs.python.org/library/select.html
>>
>> --
>> Grant
>
>The only honest answer would be that I'm totaly unfamiliar with select
>and also the documentation I found wasn't able to clear the picture.
>So are there examples of using select together with sockets available?
>

You might find Twisted easier to use correctly than the select module.
You can find some basic Twisted/UDP documentation here:

  http://twistedmatrix.com/projects/core/documentation/howto/udp.html

You can trivially change the first example to handle multiple sockets -
just add more reactor.listenUDP calls.

Jean-Paul


From aotto1968 at t-online.de  Tue May 19 09:16:55 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Tue, 19 May 2009 15:16:55 +0200
Subject: PYTHONPATH on Windows XP module load problem
Message-ID: <guubg7$nnk$03$1@news.t-online.com>

Hi,

  I have the following problem using python on windows.
  I crated a binary extension called

        pymsgque.dll

  on windows. The same extension works fine on UNIX/Linux.

  The problem is on Windows. The build is no problem 
  but python is not able to load this extension with

        import pymsgque

  and create the following error:

  Traceback (most recent call last):
  File "server.py", line 13, in <module>
    import pymsgque
ImportError: No module named pymsgque
[31906 refs]

  the PYTHONPATH variable has the directory of
  pymsgque.dll location

  the build of python and the pymsgque extension was done using
        > Microsoft Visual C++ Express Edition

  it seems that I missing something

mfg

  Andreas Otto


From aahz at pythoncraft.com  Tue May 19 09:19:34 2009
From: aahz at pythoncraft.com (Aahz)
Date: 19 May 2009 06:19:34 -0700
Subject: identifying live hosts on a network
References: <069f821d-1b73-4ed9-b298-09e7c0548122@p6g2000pre.googlegroups.com>
Message-ID: <guubl6$28b$1@panix3.panix.com>

In article <069f821d-1b73-4ed9-b298-09e7c0548122 at p6g2000pre.googlegroups.com>,
 <hunteroakesgun at gmail.com> wrote:
>
>I am new to python and am having trouble coming up with a script that
>idenifies all the live hosts on my network.

First you need to define what constitutes a "live host".
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In 1968 it took the computing power of 2 C-64's to fly a rocket to the moon.
Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows 98.
Something must have gone wrong."  --/bin/fortune


From JackTradesPublic at gmail.com  Tue May 19 09:24:26 2009
From: JackTradesPublic at gmail.com (Jack Trades)
Date: Tue, 19 May 2009 06:24:26 -0700 (PDT)
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<Xns9C1058657406Dduncanbooth@127.0.0.1>
Message-ID: <9dc7ca0a-7bb7-4027-af72-c1b7410dc792@r3g2000vbp.googlegroups.com>

On May 19, 3:46?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Jack Trades <JackTradesPub... at gmail.com> wrote:
> > Originally I had the 'data' directory in the same directory as the cgi
> > scripts and was using os.system("svn commit"), however I kept running
> > into weird bugs with this method. ?So I moved the data directory out
> > of the cgi directory and plan to use a separate repository. ?So is
> > there a prefered way to commit this directory to a subversion
> > repository from a Python script?
>
> Subversion has Python bindings, but for a friendlier interface have a look
> athttp://pysvn.tigris.org/
>
> An example from the docs athttp://pysvn.tigris.org/docs/pysvn_prog_guide.html:
>
> Commit changes to the repository
>
> import pysvn
> # edit the file foo.txt
> f = open('./examples/pysvn/foo.txt', 'w')
> f.write('Sample versioned file via python\n')
> f.close()
> # checkin the change with a log message
> client = pysvn.Client()
> client.checkin(['./examples/pysvn'], 'Corrected spelling of python in foo.txt')
>
> --
> Duncan Boothhttp://kupuguy.blogspot.com

Thanks that's what I was looking for.


From JackTradesPublic at gmail.com  Tue May 19 09:32:04 2009
From: JackTradesPublic at gmail.com (Jack Trades)
Date: Tue, 19 May 2009 06:32:04 -0700 (PDT)
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<gutcdg$3st$4@lust.ihug.co.nz>
	<ac63e27e-2dd9-4c27-ace0-d9e205be7afa@s31g2000vbp.googlegroups.com>
	<gutoh2$b0a$1@lust.ihug.co.nz>
Message-ID: <5f7f9840-0e17-48fb-acf9-04186fb1b7ab@r3g2000vbp.googlegroups.com>

On May 19, 3:53?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <ac63e27e-2dd9-4c27-ace0-
>
> d9e205be7... at s31g2000vbp.googlegroups.com>, Jack Trades wrote:
> > On May 19, 12:26 am, Lawrence D'Oliveiro <l... at geek-
> > central.gen.new_zealand> wrote:
>
> >> In message <2904e7de-0a8d-4697-9c44-
>
> >> c83bb5319... at s31g2000vbp.googlegroups.com>, Jack Trades wrote:
> >> > Originally I had the 'data' directory in the same directory as the cgi
> >> > scripts and was using os.system("svn commit"), however I kept running
> >> > into weird bugs with this method.
>
> >> What bugs?
>
> > I'm not 100% sure, but I think it had to do with executable
> > permissions on the cgi scripts.
>
> Possibly your CGI scripts are running as some user like "nobody", which
> doesn't have the right access to the files/directories. Changing APIs won't
> help here.

Thanks for the help, I'll have to look into that further.  If that is
the case, would setuid be appropriate here?  Or is there a better way
to give the script the appropriate permissions?
The only thing that baffles me is that the script works before a
commit and only sometimes after a commit, if it were an access problem
wouldn't it fail before the commit as well?


From tjreedy at udel.edu  Tue May 19 09:43:36 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 19 May 2009 09:43:36 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <349328ba-e396-46aa-ac4b-ae5d7c2796a9@v17g2000vbb.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com>
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com>
	<a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com>
	<349328ba-e396-46aa-ac4b-ae5d7c2796a9@v17g2000vbb.googlegroups.com>
Message-ID: <guud26$dk7$1@ger.gmane.org>

jeremy at martinfamily.freeserve.co.uk wrote:

> "In 1999 Greg Stein created a patch set for the interpreter that
> removed the GIL, but added granular locking around sensitive
> interpreter operations. This patch set had the direct effect of
> speeding up threaded execution, but made single threaded execution two
> times slower."
> 
> Source: http://jessenoller.com/2009/02/01/python-threads-and-the-global-interpreter-lock/
> 
> That was ten years ago - do you have any idea as to how things have
> been progressing in this area since then?

The slowdown may be less severe, but known attempts to replace, rather 
than merely remove, GIL slow down single thread execution.  Otherwise, 
GIL wouild be gone.  No one has been willing to maintain a multi-thread 
fork/branch.



From tjreedy at udel.edu  Tue May 19 09:50:18 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 19 May 2009 09:50:18 -0400
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <20090519082013.65fba203.darcy@druid.net>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>	<loom.20090518T151856-387@post.gmane.org>	<8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com>
	<20090519082013.65fba203.darcy@druid.net>
Message-ID: <guudeo$f15$1@ger.gmane.org>

D'Arcy J.M. Cain wrote:
> On Tue, 19 May 2009 10:51:57 +0530
> Kalyan Chakravarthy <kalyanchakravarthy at hyit.com> wrote:
>> Actually my requirement is
>> in an web application when user enters User name and Password,
>> back end i needs to check, is it they entered correct user name with
>> password ( here i want to read the Spread Sheet Data in Python code  ),
>> for this i will keep all the user names and passwords in Google Spread Sheet
> 
> I can't answer your question about reading Google spreadsheets but I do
> wonder why you are trying to solve a database problem with a
> spreadsheet in the first place, especially with all the support Python
> has for database access.

Hardly even a database problem.  OP only needs a dict mapping username 
to passwd.  Of course, that could grow...

An issue not touched on is that passwords should *not* be kept in 
plaintext form.  Hence the data store should be written by program and 
not hand-edited.  With a small dict kept in memory, a pickle might work 
fine.

tjr




From darcy at druid.net  Tue May 19 09:57:17 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Tue, 19 May 2009 09:57:17 -0400
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <guudeo$f15$1@ger.gmane.org>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
	<loom.20090518T151856-387@post.gmane.org>
	<8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com>
	<20090519082013.65fba203.darcy@druid.net>
	<guudeo$f15$1@ger.gmane.org>
Message-ID: <20090519095717.8370d2e6.darcy@druid.net>

On Tue, 19 May 2009 09:50:18 -0400
Terry Reedy <tjreedy at udel.edu> wrote:
> D'Arcy J.M. Cain wrote:
> > I can't answer your question about reading Google spreadsheets but I do
> > wonder why you are trying to solve a database problem with a
> 
> Hardly even a database problem.  OP only needs a dict mapping username 
> to passwd.  Of course, that could grow...

s/could/will/

> An issue not touched on is that passwords should *not* be kept in 
> plaintext form.  Hence the data store should be written by program and 

I hear you but I'm not so sure that that is an absolute.  There are
many applications that allow you to have your password emailed to you.
For something with low risk that's perfectly acceptable.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From google at mrabarnett.plus.com  Tue May 19 10:08:44 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 19 May 2009 15:08:44 +0100
Subject: PYTHONPATH on Windows XP module load problem
In-Reply-To: <guubg7$nnk$03$1@news.t-online.com>
References: <guubg7$nnk$03$1@news.t-online.com>
Message-ID: <4A12BD6C.5000508@mrabarnett.plus.com>

Andreas Otto wrote:
> Hi,
> 
>   I have the following problem using python on windows.
>   I crated a binary extension called
> 
>         pymsgque.dll
> 
>   on windows. The same extension works fine on UNIX/Linux.
> 
>   The problem is on Windows. The build is no problem 
>   but python is not able to load this extension with
> 
>         import pymsgque
> 
>   and create the following error:
> 
>   Traceback (most recent call last):
>   File "server.py", line 13, in <module>
>     import pymsgque
> ImportError: No module named pymsgque
> [31906 refs]
> 
>   the PYTHONPATH variable has the directory of
>   pymsgque.dll location
> 
>   the build of python and the pymsgque extension was done using
>         > Microsoft Visual C++ Express Edition
> 
>   it seems that I missing something
> 
> mfg
> 
>   Andreas Otto

Does this help?

http://pyfaq.infogami.com/is-a-pyd-file-the-same-as-a-dll



From james at agentultra.com  Tue May 19 10:12:12 2009
From: james at agentultra.com (J Kenneth King)
Date: Tue, 19 May 2009 10:12:12 -0400
Subject: Annoying feedparser issues
References: <4a0e0daf$0$1645$742ec2ed@news.sonic.net>
Message-ID: <85ab59kwqr.fsf@agentultra.com>

John Nagle <nagle at animats.com> writes:

>     This really isn't the fault of the "feedparser" module, but it's
> worth mentioning.
>
>     I have an application which needs to read each new item from a feed
> as it shows up, as efficiently as possible, because it's monitoring multiple
> feeds.  I want exactly one copy of each item as it comes in.
>
>     In theory, this is easy.  Each time the feed is polled, pass in the
> timestamp and ID from the previous poll, and if nothing has changed,
> a 304 status should come back.
>
>     Results are spotty.  It mostly works for Reuters.  It doesn't work
> for Twitter at all; Twitter updates the timestamp even when nothing changes.
> So items are routinely re-read.  (That has to be costing Twitter a huge
> amount of bandwidth from useless polls.)
>
>     Some sites have changing feed etags because they're using multiple
> servers and a load balancer. These can be recognized because the same
> etags will show up again after a change.
>
>     Items can supposedly be unduplicated by using the "etag" value.
> This almost works, but it's tricker than one might think.  On some feeds,
> an item might go away, yet come back in a later feed.  This happens with
> news feeds from major news sources, because they have priorities that
> don't show up in RSS.  High priority stories might push a low priority story
> off the feed, but it may come back later.  Also, every night at 00:00, some
> feeds like Reuters re-number everything.  The only thing that works reliably
> is comparing the story text.
>
> 					John Nagle

I can't really offer much help, but I feel your pain.  I had to write
something of a similar system for a large company once and it hurt.
They mixed different formats with different protocols and man it was
something in the end.  The law of fuzzy inputs makes this stuff tough.

It may help to create a hash from the first x number of bytes of the
article text.  Then cache all the hashes in a local dbm-style
database.  We used berkely, but it doesn't really matter.  Whatever
way you can generate and store a keyed signature will allow you to do
a quick look up and see if you've already processed that article.


From david.lyon at preisshare.net  Tue May 19 10:13:21 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 19 May 2009 10:13:21 -0400
Subject: Package problem
In-Reply-To: <5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<5b8d13220905182115s2731aa91q6dd13064acc8fd88@mail.gmail.com>
	<39468261f5a617fdea45101268b7be6c@preisshare.net>
	<5b8d13220905182153j490f4826kf2b21422de901210@mail.gmail.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
	<5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
Message-ID: <b52625f2c83c1bbff61a44ec74f0b2e8@preisshare.net>

On Tue, 19 May 2009 15:45:42 +0900, David Cournapeau <cournape at gmail.com>
wrote:
> There is no simple solution to the following situation:
>    - install setuptools from ubuntu...

When I have a ubuntu system I will try it....

> But still, the whole
> value of ..(python).. is to have a whole set of packages which
> are tested together. Updating packages 'randomly' from 3rd party
> sources is inherently against this.

Well I presume pypi goes a long way to offering this...

I've used easy_install a few hundred times manually now and I've 
noticed some incorrect outcomes. For example, downloading a
package marked debian into my windows system... and wondering
why it didn't work....

for most packages... it seems to work quite well though..

I think the issue is really that if we can do tests and count
test results.. we'll probably get a lot further than we have
in the past.

We seem to be at the 85% mark... next stop should be 95% or
at least some known and measurable number...

I'm fully agreeing it can get better...

David







From colinlandrum at gmail.com  Tue May 19 10:19:20 2009
From: colinlandrum at gmail.com (hubritic)
Date: Tue, 19 May 2009 07:19:20 -0700 (PDT)
Subject: pyparsing question: single word values with a double quoted string 
	every once in a while
Message-ID: <c3c9c0a6-2229-4f80-873c-99a43ed3a36f@s38g2000prg.googlegroups.com>

I want to parse a log that has entries like this:

[2009-03-17 07:28:05.545476 -0500] rprt s=d2bpr80d6 m=2 mod=mail
cmd=msg module=access rule=x_dynamic_ip action=discard attachments=0
rcpts=1
routes=DL_UK_ALL,NOT_DL_UK_ALL,default_inbound,firewallsafe,mail01_mail02,spfsafe
size=4363 guid=291f0f108fd3a6e73a11f96f4fb9e4cd hdr_mid=
qid=n2HCS4ks025832 subject="I want to interview you" duration=0.236
elapsed=0.280


the keywords will not always be the same. Also differing log levels
will provide a different mix of keywords.

This is good enough to get the majority of cases where there is a
keyword, a "=" and then a value with no spaces:

Group(Word(alphas + "+_-.").setResultsName("keyword") +  Suppress
(Literal ("=")) + Optional(Word(printables)))

Sometimes there is a subject, which is a quoted string. That is easy
enough to get with this:
dblQuotedString(ZeroOrMore(Word(printables) ) )

My problem is combining them into one expression. Either I wind up
with just the subject or I wind up with they keywords and their
values, one of which is:

subject, '"I'

which is clearly not what I want.

Do I scan each line twice, first looking for quotes ?

Thanks




From avekir at gmail.com  Tue May 19 10:42:05 2009
From: avekir at gmail.com (Kirill)
Date: Tue, 19 May 2009 07:42:05 -0700 (PDT)
Subject: P2P text chat engine
References: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>
	<76gn8qF1cliefU1@mid.uni-berlin.de>
Message-ID: <56382643-36d9-436a-9e55-739e82ade7ee@z5g2000vba.googlegroups.com>

On 7 ???, 21:23, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Navanjo schrieb:
>
> > If you have the source code of a p2p text chat engine please send to me
>
> I found that & a pot of gold under my bed. Care to give me your address
> so that I can send it to you?
>
> SCNR,
> Diez

Hello, can you sent it to me ?
avekir at gmail.com
Many thanks!!!


From kyosohma at gmail.com  Tue May 19 10:44:15 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 19 May 2009 07:44:15 -0700 (PDT)
Subject: Advanced Python books?
References: <gusevn$jjd$1@reader1.panix.com>
Message-ID: <bf785711-6214-4be4-a205-4b7521e8c274@b1g2000vbc.googlegroups.com>

On May 18, 3:04?pm, kj <so... at 987jk.com.invalid> wrote:
> I have read a couple of "learn Python"-type books, and now I'm
> looking for some more advanced books on Python, something analogous
> to "Effective Java" or "High-Order Perl". ?I've only been able to
> find "Advanced Python 3 Programming Techniques", which, as far as
> I can tell, is only available as a "Kindle Book". ?(Since I won't
> be buying a Kindle for another few decades, this is not an option
> for me.)
>
> I tried out "Dive into Python", because I was told that it was
> written for people with prior programming experience. ?It's an OK
> book, but I don't find that it is much more advanced than pretty
> much any other "learn Python" book I've seen.
>
> Basically I'm looking for a book that assumes that one has the
> basics of the language down, and instead focuses on standard problems
> of software development, such as application architecture and
> design, prototyping, debugging, profiling and performance-tuning,
> testing, packaging/distribution, extending/embedding, threading
> and IPC, persistence, etc., and on various prototypical cases such
> as command-line utilities, GUI-apps, webapps, database-backed apps,
> simulations, etc.
>
> Granted, it is unlikely that a single book will do justice to all
> these areas, but these are the topics I'm now interested in, from
> the perspective of Python.
>
> Any suggestions?
>
> TIA!
> --
> NOTE: In my address everything before the first period is backwards;
> and the last period, and everything after it, should be discarded.

Hetland's book, "Beginning Python" has a bunch of projects at the end.
It also has a chapter on testing, network programming, extending
python, packaging and more. They're not in depth, but they give you a
taste.

Lutz's "Programming Python" has some pretty in depth projects using
Tkinter. You might find the Python Cookbook helpful or you could just
look at ActiveState's cookbook which is what the book was based on:
http://code.activestate.com/recipes/langs/python/

- Mike


From deets at nospam.web.de  Tue May 19 10:51:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 19 May 2009 16:51:33 +0200
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<gutcdg$3st$4@lust.ihug.co.nz>
	<ac63e27e-2dd9-4c27-ace0-d9e205be7afa@s31g2000vbp.googlegroups.com>
	<gutoh2$b0a$1@lust.ihug.co.nz>
	<5f7f9840-0e17-48fb-acf9-04186fb1b7ab@r3g2000vbp.googlegroups.com>
Message-ID: <77fv7jF1h44coU1@mid.uni-berlin.de>

Jack Trades wrote:

> On May 19, 3:53?am, Lawrence D'Oliveiro <l... at geek-
> central.gen.new_zealand> wrote:
>> In message <ac63e27e-2dd9-4c27-ace0-
>>
>> d9e205be7... at s31g2000vbp.googlegroups.com>, Jack Trades wrote:
>> > On May 19, 12:26 am, Lawrence D'Oliveiro <l... at geek-
>> > central.gen.new_zealand> wrote:
>>
>> >> In message <2904e7de-0a8d-4697-9c44-
>>
>> >> c83bb5319... at s31g2000vbp.googlegroups.com>, Jack Trades wrote:
>> >> > Originally I had the 'data' directory in the same directory as the
>> >> > cgi scripts and was using os.system("svn commit"), however I kept
>> >> > running into weird bugs with this method.
>>
>> >> What bugs?
>>
>> > I'm not 100% sure, but I think it had to do with executable
>> > permissions on the cgi scripts.
>>
>> Possibly your CGI scripts are running as some user like "nobody", which
>> doesn't have the right access to the files/directories. Changing APIs
>> won't help here.
> 
> Thanks for the help, I'll have to look into that further.  If that is
> the case, would setuid be appropriate here?  Or is there a better way
> to give the script the appropriate permissions?
> The only thing that baffles me is that the script works before a
> commit and only sometimes after a commit, if it were an access problem
> wouldn't it fail before the commit as well?

I have had many troubles with SVN + permissions.

My recipe is the following:

 - create (or use) a "subversion"-group
 - make all users (including e.g. www-data) that shall access the SVN
members of this group
 - chown -R the svn-repository so that it belongs to this group
 - chmod g+s -R to the svn-repository, so that the sticky group bit is set.

THis solves the problems for me usually.

Diez


From aotto1968 at t-online.de  Tue May 19 10:52:30 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Tue, 19 May 2009 16:52:30 +0200
Subject: PYTHONPATH on Windows XP module load problem
References: <guubg7$nnk$03$1@news.t-online.com>
	<mailman.390.1242742113.8015.python-list@python.org>
Message-ID: <guuh3f$47k$00$1@news.t-online.com>

MRAB wrote:

> Andreas Otto wrote:
>> Hi,
>> 
>>   I have the following problem using python on windows.
>>   I crated a binary extension called
>> 
>>         pymsgque.dll
>> 
>>   on windows. The same extension works fine on UNIX/Linux.
>> 
>>   The problem is on Windows. The build is no problem
>>   but python is not able to load this extension with
>> 
>>         import pymsgque
>> 
>>   and create the following error:
>> 
>>   Traceback (most recent call last):
>>   File "server.py", line 13, in <module>
>>     import pymsgque
>> ImportError: No module named pymsgque
>> [31906 refs]
>> 
>>   the PYTHONPATH variable has the directory of
>>   pymsgque.dll location
>> 
>>   the build of python and the pymsgque extension was done using
>>         > Microsoft Visual C++ Express Edition
>> 
>>   it seems that I missing something
>> 
>> mfg
>> 
>>   Andreas Otto
> 
> Does this help?
> 
> http://pyfaq.infogami.com/is-a-pyd-file-the-same-as-a-dll

Hi,

  this link is nice but I'm still confused ...

  1. on LINUX I create a "pymsgque.so" and I can load this library
        with "import pymsgque"

  2. in WINDOWS, I expect to create a "pymsgque.dll" and do the
        same as on unix "import pymgque"

        -> is this behaviour is supported or not ???
 
  3. the hint with "*.pyd" is totally new to me and I don't know
        is this the "official" way to use dll's on windows or
        just a hack which works


mfg

  Andreas Otto



From matiassurdi at gmail.com  Tue May 19 10:54:13 2009
From: matiassurdi at gmail.com (Matias Surdi)
Date: Tue, 19 May 2009 16:54:13 +0200
Subject: identifying live hosts on a network
In-Reply-To: <069f821d-1b73-4ed9-b298-09e7c0548122@p6g2000pre.googlegroups.com>
References: <069f821d-1b73-4ed9-b298-09e7c0548122@p6g2000pre.googlegroups.com>
Message-ID: <guuh6l$t8e$1@ger.gmane.org>

hunteroakesgun at gmail.com escribi?:
> HI
> I am new to python and am having trouble coming up with a script that
> idenifies all the live hosts on my network.
> thanks Hunter


I've done this in the past with the great help of nmap:

# nmap -sP 192.168.0.0/23

this will find hosts "alive" from 192.168.0.1 to 192.168.1.254

 From python, you can use it by saving it's output to a file and then 
reading or with the help of os.popen.


In this case, "alive" means that the hosts with the ip being analyzed 
responds to ARPs. see the manpage for nmap.

Matias.








From laurentluce49 at yahoo.com  Tue May 19 10:55:44 2009
From: laurentluce49 at yahoo.com (Laurent Luce)
Date: Tue, 19 May 2009 07:55:44 -0700
Subject: strip char from list of strings
References: <195055.64779.qm@web54204.mail.re2.yahoo.com>
	<mailman.372.1242718327.8015.python-list@python.org>
Message-ID: <guuh5b$1s4$1@services.telesweet.net>

I had a simple loop stripping each string but I was looking for
something concise and efficient. I like the following answer:
x = [s.rstrip('\n') for s in x]

David Stanek wrote:
> On Mon, May 18, 2009 at 3:30 PM, Laurent Luce <laurentluce49 at yahoo.com> wrote:
>> I have the following list:
>>
>> [ 'test\n', test2\n', 'test3\n' ]
>>
>> I want to remove the '\n' from each string in place, what is the most efficient way to do that ?
>>
> 
> What have you tried so far?
> 


From laurentluce49 at yahoo.com  Tue May 19 10:56:35 2009
From: laurentluce49 at yahoo.com (Laurent Luce)
Date: Tue, 19 May 2009 07:56:35 -0700
Subject: strip char from list of strings
References: <mailman.371.1242718187.8015.python-list@python.org>
	<e2c96842-552a-41d3-80c7-818d5ec09084@f16g2000vbf.googlegroups.com>
Message-ID: <guuh6t$1oq$1@services.telesweet.net>

Thanks Casey. I like your solution.

Casey Webster wrote:
> On May 18, 3:30 pm, Laurent Luce <laurentluc... at yahoo.com> wrote:
>> I have the following list:
>>
>> [ 'test\n', test2\n', 'test3\n' ]
>>
>> I want to remove the '\n' from each string in place, what is the most efficient way to do that ?
>>
>> Regards,
>>
>> Laurent
> 
> Do you _really_ need to do this in place?  If not, the simplest answer
> is probably:
> 
>>>> x = ['test\n', test2\n', 'test3\n']
>>>> x = [s.rstrip('\n') for s in x]
> 
> And if what you really want to do is strip off all trailing whitespace
> (tabs, spaces, and newlines), then:
> 
>>>> x = [s.rstrip() for s in x]
> 
> A quick test of 1,000,000 strings of length 27 took less than 0.2
> seconds on my PC.  Efficiency isn't really much of an issue for most
> data sets.


From manu3d at gmail.com  Tue May 19 11:15:38 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Tue, 19 May 2009 08:15:38 -0700 (PDT)
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
	<4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>
Message-ID: <3b84542c-7746-498d-8d9e-977deaecfc1d@r3g2000vbp.googlegroups.com>

On May 19, 6:50?am, Stefan Behnel <stefan... at behnel.de> wrote:
> It's pretty easy to write unmaintainable code that uses the DOM API, though.

I'm finding that at my own expenses...

Why would anybody want to use the DOM? I suppose the main reason is
that it is one of the most reliable standards around. It might be more
complicated, but that's probably because lots of very smart people
thought about it very carefully and it couldn't be made any simpler.
And hopefully will stand the test of time.

Anyway. Any taker on the original (very python-related rather than DOM
related) problem at hand?

Manu


From lists at cheimes.de  Tue May 19 11:18:17 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 19 May 2009 17:18:17 +0200
Subject: PYTHONPATH on Windows XP module load problem
In-Reply-To: <guuh3f$47k$00$1@news.t-online.com>
References: <guubg7$nnk$03$1@news.t-online.com>	<mailman.390.1242742113.8015.python-list@python.org>
	<guuh3f$47k$00$1@news.t-online.com>
Message-ID: <4A12CDB9.9020501@cheimes.de>

Andreas Otto wrote:
>   1. on LINUX I create a "pymsgque.so" and I can load this library
>         with "import pymsgque"
> 
>   2. in WINDOWS, I expect to create a "pymsgque.dll" and do the
>         same as on unix "import pymgque"
> 
>         -> is this behaviour is supported or not ???
>  
>   3. the hint with "*.pyd" is totally new to me and I don't know
>         is this the "official" way to use dll's on windows or
>         just a hack which works

The suffix of Python extension has changed over time. It used to be .dll
but starting with Python 2.5 only .pyd files are imported. A .pyd file
is an ordinary, renamed dll file.

Christian


From mypromise at sina.com  Tue May 19 11:30:50 2009
From: mypromise at sina.com (zhouhaifeng)
Date: Tue, 19 May 2009 23:30:50 +0800
Subject: how to get the spesific line of the text in the clipboard 
In-Reply-To: <mailman.1476.1242744869.8014.python-list@python.org>
References: <mailman.1476.1242744869.8014.python-list@python.org>
Message-ID: <4A12D0AA.9060407@sina.com>

I want to get the eighth line in the text of the text in the clipboad, 
but when I call  GetClipboardData
I only get a string, how can I repair it?

thanks   a lot.

My code is here :
 try:       
            win32clipboard.OpenClipboard(hWnd)
            #win32api.Sleep(500)
            text = win32clipboard.GetClipboardData(win32con.CF_TEXT)
            #win32clipboard.EmptyClipboard()
            win32clipboard.CloseClipboard()

            logging.info(len(text))
          
            return text
        except Exception, exc:
            logging.info(exc)


...


def get_file_title(filename):
    f = file(filename)
    #f = open(filename, encoding='gb2312', mode='w+')
    title = u""
    line_count = 0
    for line in f:
        line_count = line_count + 1
        if line_count == 8:                           
<----------------------------now I write the text of the clipboard into 
file, and then read it from file, at this time, I can get line 8 , but 
it so low efficiency
            title = unicode(line, 'gb2312', 'ignore')
            title = title.replace("\r\n", '')
            break
    return title



From nkamado at gmail.com  Tue May 19 11:33:13 2009
From: nkamado at gmail.com (=?ISO-2022-JP?B?GyRCM3lFWjUtTkkbKEI=?=)
Date: Wed, 20 May 2009 00:33:13 +0900
Subject: I was able to use pyInstaller as a python library
Message-ID: <4A12D139.4040001@gmail.com>

Hello, Everyone.

I was able to use pyInstaller as a python library

http://moco.sakura.ne.jp/pyInstaller.zip

and This library test code is available in

http://moco.sakura.ne.jp/pyi_test.zip

This library implements only a function to output windows binary.
and I don't add the change to the contents of the pyinstaller
directory.

Thanking you in advance.

// Noriyoshi Kamado : nkamado at gmail.com




From cournape at gmail.com  Tue May 19 11:40:28 2009
From: cournape at gmail.com (David Cournapeau)
Date: Wed, 20 May 2009 00:40:28 +0900
Subject: Package problem
In-Reply-To: <200905191329.48531.a.cavallo@cavallinux.eu>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
	<5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
	<200905191329.48531.a.cavallo@cavallinux.eu>
Message-ID: <5b8d13220905190840u5cd76323y98c44f5dd724c7e@mail.gmail.com>

On Tue, May 19, 2009 at 9:29 PM, A. Cavallo <a.cavallo at cavallinux.eu> wrote:
>> > It is solved in other languages.. for example perl.. and delphi
>> I don't know much about perl, and even less about delphi, but I am
>> pretty sure it does not solve the problem of overwriting files from a
>> package with an installation outside the control of the package
>> manager.
>
> On a sytem a possible solution would be:
>
> ?/usr/lib/python2.5/site-package/foobar <- The os managed one
> ?/usr/lib/python2.5/site-package/foobar-2.0 <- The alternatives
> ?/usr/lib/python2.5/site-package/foobar-2.1
>
> and using something (in the python interpreter)
>
> import foobar (imports the foobar)
> import foobar requires >= 2.1 (imports foobar 2.1 or above)

This does not solve the discussed problem. If you revwrite foobar-2.0
with foobar-2.0 installed from sources, you don't know whether you
will break the system. You will most likely do so, because of
difference filesystem conventions, for example. And what will happen
when you will do apt-get remove foobar-2.0 (on a .deb system) ? Most
likely, as the set of files installed from sources are not exactly the
same as the set of files installed by dpkg, the uninstall will be
broken. Specially in the case of configuration files, or daemon, this
may be quite serious.

>>
>> There is no simple solution to the following situation:
>> ? ?- install setuptools from ubuntu -> files get into /usr
>> (/usr/lib/python2.5/site-packages, etc...)
>
> setuptools is the problem;) It tries to do too many things imho.

The discussion has nothing to do with setuptools, or even python for
that matter. The problem is that overwriting files managed by the
software management system without its consent is bound to be broken,
on any system (including windows). That's why you should avoid
installing from sources into the locations managed by the OS, be it
/usr for unix, or C:\Windows on windows, etc...

David


From Scott.Daniels at Acm.Org  Tue May 19 11:44:06 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 19 May 2009 08:44:06 -0700
Subject: PYTHONPATH on Windows XP module load problem
In-Reply-To: <guuh3f$47k$00$1@news.t-online.com>
References: <guubg7$nnk$03$1@news.t-online.com>
	<mailman.390.1242742113.8015.python-list@python.org>
	<guuh3f$47k$00$1@news.t-online.com>
Message-ID: <SbSdncYZUsrgT4_XnZ2dnUVZ_s2dnZ2d@pdx.net>

Andreas Otto wrote:
>> Does this help?
>> http://pyfaq.infogami.com/is-a-pyd-file-the-same-as-a-dll
>
>   this link is nice but I'm still confused ...
> 
>   1. on LINUX I create a "pymsgque.so" and I can load this library
>         with "import pymsgque"
And my bathroom is covered in wallpaper.

>   2. in WINDOWS, I expect to create a "pymsgque.dll" and do the
>         same as on unix "import pymgque"
Surprise, surprise, surprise.  Your expectations do not match reality.
Why not expect to copy "pymsgque.so" over to Windows, as long as you
are busy expecting things?

>         -> is this behaviour is supported or not ???
>  
>   3. the hint with "*.pyd" is totally new to me and I don't know
>         is this the "official" way to use dll's on windows or
>         just a hack which works

Yes, this is the official way.  The .pyd extension is a way of
stating a claim that the code follows the Python C module conventions.
Windows has certain conventions about the behavior of .dll files that
interfere with making these modules .dlls.

In case you are curious about the snarky attitude:
    (0) You asked a question.
    (1) You got an informative answer which allowed you to succeed.
    (2) You then explained what you expect to work; something you
        _know_ by experience does not work, and ask if it is supported.

Up until step 2, I was on your side.  To follow with a question asking
if something "totally new to you" is "just a hack which works," when
your only alternative is the behavior you expected to work leaves me
thinking you trust the knowledge you gain from introspection over that
from experimentation or research.

Further, if you built modules using the suggested method, (writing a
setup.py, using "python setup.py build"; "python setup.py install",
you would discover, by what I would guess to be your astonishment, that
a .pyd file got put in site-packages or wherever.


--Scott David Daniels
Scott.Daniels at Acm.Org


From hv at tbz-pariv.de  Tue May 19 11:48:58 2009
From: hv at tbz-pariv.de (Thomas Guettler)
Date: Tue, 19 May 2009 17:48:58 +0200
Subject: Advanced Python books?
In-Reply-To: <gusevn$jjd$1@reader1.panix.com>
References: <gusevn$jjd$1@reader1.panix.com>
Message-ID: <77g2nbF1h267rU1@mid.individual.net>

kj schrieb:
> I have read a couple of "learn Python"-type books, and now I'm
> looking for some more advanced books on Python,
...
> Basically I'm looking for a book that assumes that one has the
> basics of the language down, and instead focuses on standard problems
> of software development, such as application architecture and
> design, prototyping, debugging, profiling and performance-tuning,
> testing, packaging/distribution, extending/embedding, threading
> and IPC, persistence, etc., and on various prototypical cases such
> as command-line utilities, GUI-apps, webapps, database-backed apps,
> simulations, etc.

I think there is no such book. Maybe the Python Cookbook comes near.

webapps: I use django, other use turbogears, other even different stuff...
There are several books about e.g. django. It would be hard to
put all the magic of all web apps into one chapter.

GUI-apps: You can use tkinter, qt or gtk.... again it would be hard
to put something useable into one chapter.

   Thomas

-- 
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de


From __peter__ at web.de  Tue May 19 11:57:30 2009
From: __peter__ at web.de (Peter Otten)
Date: Tue, 19 May 2009 17:57:30 +0200
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
Message-ID: <guukt4$bij$00$1@news.t-online.com>

Emanuele D'Arrigo wrote:

> This is all good and dandy and it works, mostly. However, if you look
> at the code below for the method __getattr__, it appears to be
> attempting to prevent direct access to -any- variable starting with an
> underscore.
> 
>     def __getattr__(self, key):
>         if key[:1]=='_':
>             raise AttributeError, key
> 
> But access isn't actually prevented because __getattr__ is invoked -
> only- if an attribute is not found by normal means. So, is it just me
> or that little snipped of code either has another purpose or simply
> doesn't do the intended job?

It doesn't do what you think it does; it is there to prevent "infinite" 
recursion. Have a look at the complete method:

>     def __getattr__(self, key):
>         if key[:1]=='_':
>             raise AttributeError, key
>         try:
>             getter= getattr(self, '_get_'+key)
>         except AttributeError:
>             raise AttributeError, key
>         return getter()

If you instantiate the object and try to access the -- non-existent -- 
attribute yadda __getattr__() will be called with key="yadda" which doesn't 
start with an underscore and with gettattr(self, "_get_yadda") triggers 
another __getattr__() call as _get_yadda doesn't exist either. If the check 
weren't there yet another getattr(self, "_get__get_yadda") call would 
follow, and so on until the recursion limit is reached.

Peter



From grahn+nntp at snipabacken.se  Tue May 19 12:00:20 2009
From: grahn+nntp at snipabacken.se (Jorgen Grahn)
Date: 19 May 2009 16:00:20 GMT
Subject: Which C compiler?
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>
	<4a11092f$0$30903$9b622d9e@news.freenet.de>
	<1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>
	<mailman.355.1242686909.8015.python-list@python.org>
Message-ID: <slrnh15lso.2c4.grahn+nntp@frailea.sa.invalid>

On Mon, 18 May 2009 15:47:41 -0700, norseman <norseman at hughes.net> wrote:

> I suspect that if all python users were in the same room and the 
> question "Are you NOT happy with python's upgrade requirements?" was 
> asked you would find most hands in the air.  I have said it before - the 
> current attitude of 'new means we start over' was what nearly destroyed 
> Apple. Doesn't take joe public long to get tired of constantly 
> re-buying, re-writing themselves, re-hiring the same people to re-write 
> the same thing, etc...

I dislike the "bleeding edge" aspect of Python culture too, but (as
long as everyone ignores Python 3.0) it's not really something which
hurts me in my daily life. *Not* using Python would hurt, though.

I'm on Linux though, and use no third-party modules which haven't
already been filtered by Debian's maintainers. I don't know if that's
the reason, but my applications rarely or never break.  So I'm not
quite sure what happened in your case ...

/Jorgen

-- 
  // Jorgen Grahn <grahn@        Ph'nglui mglw'nafh Cthulhu
\X/     snipabacken.se>          R'lyeh wgah'nagl fhtagn!


From google at mrabarnett.plus.com  Tue May 19 12:08:38 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 19 May 2009 17:08:38 +0100
Subject: how to get the spesific line of the text in the clipboard
In-Reply-To: <4A12D0AA.9060407@sina.com>
References: <mailman.1476.1242744869.8014.python-list@python.org>
	<4A12D0AA.9060407@sina.com>
Message-ID: <4A12D986.4050900@mrabarnett.plus.com>

zhouhaifeng wrote:
> I want to get the eighth line in the text of the text in the clipboad, 
> but when I call  GetClipboardData
> I only get a string, how can I repair it?
> 
> thanks   a lot.
> 
> My code is here :
> try:                  win32clipboard.OpenClipboard(hWnd)
>            #win32api.Sleep(500)
>            text = win32clipboard.GetClipboardData(win32con.CF_TEXT)
>            #win32clipboard.EmptyClipboard()
>            win32clipboard.CloseClipboard()
> 
>            logging.info(len(text))
>                     return text
>        except Exception, exc:
>            logging.info(exc)
> 
[snip]

Split the string into lines and take the eighth line (at index 7). I've
limited the number of splits to 8 because I'm not interested in any of
the following lines:

     line = text.split("\r\n", 8)[7]



From showell30 at yahoo.com  Tue May 19 12:08:41 2009
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 19 May 2009 09:08:41 -0700 (PDT)
Subject: UDP reading on multiple sockets
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net> 
	<15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>
	<27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
Message-ID: <18a04f46-4b9d-4bf2-a6e2-5f93ab1a86ee@w35g2000prg.googlegroups.com>

On May 18, 6:19?am, thomas.vo... at likeabird.de wrote:
> On 17 Mai, 04:22, Grant Edwards <gra... at visi.com> wrote:
>
> > On 2009-05-17, Thomas Vogel <thomas.vo... at likeabird.de> wrote:
>
> > > I'm currently have the problem that I try to read UDP messages from
> > > multiple sockets in parallel. So let's say I get UDP packets from the
> > > same IP on the ports 2000, 2001, 2002,...
>
> > Is there any reason you can't do it the easy way by using
> > select?
>
> >http://docs.python.org/library/select.html
>
> > --
> > Grant
>
> The only honest answer would be that I'm totaly unfamiliar with select
> and also the documentation I found wasn't able to clear the picture.
> So are there examples of using select together with sockets available?
>

My two cents on this issue is that you should stick with asyncore for
now and just figure out how to debug better what's going on.

I understand the rationale behind the alternatives--there are
certainly advantages (even in debugging) to using something closer to
the metal, like select, or in using something that might be a better
abstraction, like Twisted.

But really, if you look at the source code for asyncore, it's just a
thin layer on top of select.select, and the entire module is under 600
lines of code.  Asyncore is much maligned, and there are some
legitimate beefs with it, but it does well, for the most part, what it
intends to do, which is to solve some of the more difficult, or at
least tedious, problems with regards to dealing with select.select.

My fear is that if you try to do this without asyncore, via select,
you'll end up reinventing lots of asyncore with lots of your own
bugs.  I have less fear about going higher in the stack, except that
it just puts another layer on top of the problem, and I think the
issue you're dealing with is fairly low-level.

So my suggestion is to figure out a good debugging strategy, either by
getting a bit more familiar with asyncore internals (with a debugger,
print statements, analysis, etc.), or by better using system tools
(like snoop, truss, etc.) to see what's happening at the I/O level, or
both.

Good luck!



Steve




From grahn+nntp at snipabacken.se  Tue May 19 12:11:33 2009
From: grahn+nntp at snipabacken.se (Jorgen Grahn)
Date: 19 May 2009 16:11:33 GMT
Subject: strip char from list of strings
References: <mailman.371.1242718187.8015.python-list@python.org>
	<m263fxcxds.fsf@cs.uu.nl>
Message-ID: <slrnh15mhp.2c4.grahn+nntp@frailea.sa.invalid>

On Tue, 19 May 2009 10:25:35 +0200, Piet van Oostrum <piet at cs.uu.nl> wrote:
>>>>>> Laurent Luce <laurentluce49 at yahoo.com> (LL) wrote:
>
>>LL> I have the following list:
>
>>LL> [ 'test\n', test2\n', 'test3\n' ]
>
>>LL> I want to remove the '\n' from each string in place, what is the
>>LL> most efficient way to do that ? 
>
> I suppose you mean you have lists similar to the one given because with
> a list of 3 elements efficiency is a non-issue unless you do something
> stupid or repeat the operation thousands of times. Even with a list of
> 1000 elements efficiency isn't very important. In fact you should worry
> about efficiency only after there are signs that there might be a
> problem. 
>
> Secondly, in Python you cannot remove a character from a string in place
> if that means modifying the string. Strings are immutable.

So the best way is probably to make sure the '\n's do not end up in
the list in the first place. I suspect that is often more elegant too.

/Jorgen

-- 
  // Jorgen Grahn <grahn@        Ph'nglui mglw'nafh Cthulhu
\X/     snipabacken.se>          R'lyeh wgah'nagl fhtagn!


From deets at nospam.web.de  Tue May 19 12:16:11 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 19 May 2009 18:16:11 +0200
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
	<4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>
	<3b84542c-7746-498d-8d9e-977deaecfc1d@r3g2000vbp.googlegroups.com>
Message-ID: <77g46cF1h8ffnU1@mid.uni-berlin.de>

Emanuele D'Arrigo wrote:

> On May 19, 6:50?am, Stefan Behnel <stefan... at behnel.de> wrote:
>> It's pretty easy to write unmaintainable code that uses the DOM API,
>> though.
> 
> I'm finding that at my own expenses...
> 
> Why would anybody want to use the DOM? I suppose the main reason is
> that it is one of the most reliable standards around. It might be more
> complicated, but that's probably because lots of very smart people
> thought about it very carefully and it couldn't be made any simpler.
> And hopefully will stand the test of time.

Sorry to say so, but that's nonsense. DOM is not complicated because it
contains anything superior - the reason (if any) is that it is formulated
as language-agnostic as possible, with the unfortunate result it is rather
clumsy to use in all languages.

Additionally, it *attempts* to unify APIs in browsers, unfortunately it is
only moderately successful.

APIs such as ElementTree don't try to burden themselves with the
language-agnosticism, and thus are much more powerful.

And no, I don't think being language-agnostic is a virtue in an API. Simply
because this can never really be reached, and then is questionable anyway.

Diez


From python.list at tim.thechases.com  Tue May 19 12:18:41 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 19 May 2009 11:18:41 -0500
Subject: how to get the spesific line of the text in the clipboard
In-Reply-To: <4A12D986.4050900@mrabarnett.plus.com>
References: <mailman.1476.1242744869.8014.python-list@python.org>	<4A12D0AA.9060407@sina.com>
	<4A12D986.4050900@mrabarnett.plus.com>
Message-ID: <4A12DBE1.8030108@tim.thechases.com>

>> I want to get the eighth line in the text of the text in the clipboad, 
>> but when I call  GetClipboardData
>> I only get a string, how can I repair it?
> [snip]
> 
> Split the string into lines and take the eighth line (at index 7). I've
> limited the number of splits to 8 because I'm not interested in any of
> the following lines:
> 
>      line = text.split("\r\n", 8)[7]

Strings have a .splitlines() method that makes this a little more 
elegant:

   line = text.splitlines()[7]

-tkc






From manu3d at gmail.com  Tue May 19 12:24:45 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Tue, 19 May 2009 09:24:45 -0700 (PDT)
Subject: DOM implementation
References: <38d48612-d2b7-482e-902a-6ad349dccf47@s20g2000vbp.googlegroups.com>
	<fa82a97f-546d-4061-9c81-5534401d0a6e@n21g2000vba.googlegroups.com> 
	<d3631430-f8b9-42ce-af42-df4f3c5ef186@o14g2000vbo.googlegroups.com> 
	<ad04c939-ff12-4543-9fc5-8a099e99ed0e@x6g2000vbg.googlegroups.com> 
	<9b5ecc41-532d-460b-a552-bf99cc9c095d@u10g2000vbd.googlegroups.com> 
	<758b4300-b522-40ed-81bf-4cc824284f6c@s31g2000vbp.googlegroups.com> 
	<d52b1ce8-0ad7-41a3-9edb-eb3ef6ebeb21@b1g2000vbc.googlegroups.com>
Message-ID: <1458c81d-8908-40fd-9d70-d34523cc42eb@o30g2000vbc.googlegroups.com>

Hello Paul, sorry for the long delay, I was trying to wrap my mind
around DOM and Events implementations...

On May 15, 7:08?pm, Paul Boddie <p... at boddie.org.uk> wrote:
> Another implementation is probably a good thing, though, since I don't
> trust my own interpretation of the specifications. ;-)

Tell me about it. In general I like the work the W3C is doing, but
some things could use a little less freedom and a little more clarity.
=) But then again, maybe it's for the best to leave things as they are
so that we can figure it out for ourselves.

> > Why shouldn't the listeners be stored directly on the EventTarget?
>
> One reason for this might well be due to the behaviour of libxml2 and
> libxml2dom: if I visit the same node in a document twice, obtaining a
> node instance each time, these two instances will be different;

Mmmm.... I don't know the specifics of libxml... are you saying that
once the object tree is created out of an XML file, requesting twice
the same node object -does not- result in a pointer to the same
instance in memory? How's that possible?

> The libxml2dom.svg module has classes which inherit from EventTarget.

And what does the EventTarget inherit from? Or are those classes
inheriting
from both Nodes and EventTargets?

> What I've tried to do is to make submodules to address particular
> formats and document models.

I think the issue to consider there is that the DOM does not restrict
a document from being a mush-up of multiple formats. I.e. it should be
possible to have XHTML and SVG tags in the same document. As long as
those modules work at element/tag level and do not obstruct each other
I think you are on the right track!

> I think that if I were to expose an event-capable DOM, other than that
> provided for SVG, I would just have a specific submodule for that
> purpose.

Ultimately I found it moderately easier to modify pxdom with the
intention of releasing "pxdome", a fork of pxdom. Monkey-patching
pxdom seemed to be a little too tricky and prone to error to create a
separate module.

> > > One of my tests tries to exercise the code, but I might be doing it
> > > all completely wrong:
> > >https://hg.boddie.org.uk/libxml2dom/file/91c0764ac7c6/tests/svg_event...

I had a more in-depth look after having spent the weekend trying to
wrap my head around all sorts of implementation issues.

My understanding, also after a few exchanges in the www-dom at w3.org
mailing-list, is that initialization of an event can happen wherever
you feel like doing it, except in Document.createEvent(). I.e. it
could be a method on the event itself or an external function. In your
code however, I believe the initialization method should be
initMouseEventNS() rather then initEventNS() and the namespace for DOM
3 Events should be -None-. Between the two implementations the first
one seems to be more aligned with the DOM documentation.

The way I'm doing it is that I invoke Document.createEvent(eventType),
I initialize the resulting event in part manually and in part with
type-related default settings and I finally use
Document.pxdomTriggerEvent(event) to create a propagation path and
iterate through its targets. I.e.:

def _trigger_DOMSubtreeModified(target):

  relevantTargetTypes = (Node.DOCUMENT_NODE,
Node.DOCUMENT_FRAGMENT_NODE,
                         Node.ELEMENT_NODE, Node.ATTRIBUTE_NODE)

  if target.nodeType not in relevantTargetTypes:
    return

  if target.ownerDocument:
    event = target.ownerDocument.createEvent("MutationEvent")

    event._target = target

    target.ownerDocument.pxdomEventDefaultInitNS(None,
"DOMSubtreeModified", event)
    target.ownerDocument.pxdomTriggerEvent(event)

Notice that I'm currently keeping this function as a loose function
but it could very well be placed as a method in the Document class or
in each relevant classes. I'm not sure why one option would be better
than all others and the DOM doesn't specify it.

The dispatch of the event to each target on the propagation path is
also a matter of implementation. In the discussion in www-dom three
options have emerged: 1) the Document node establishes the propagation
path and iterates through the targets listed to dispatch the event to
each 2) an unspecified, external object does the same job 3) the
propagation path is established, stored on the event and each event
target is responsible for recursively dispatching the event to the
next target if propagation hasn't been stopped.  Apparently an earlier
version of Mozilla's Gecko used option 3 but they eventually switched
to option 1. Again, it's unclear in what circumstances to use one
option or the other.

What I don't know at this time is how to merge all this with the
specific file formats such as SVG and HTML. I.e. in an SVG example, do
I create a GroupElement(Element) class and I override the
Document.createElement() method to create an instance of it any time a
<g> element is found in the input file? Or do I first create an
application-neutral DOM tree out of the input file and I then
instantiate a parallel application-specific structure, holding the
objects that provide methods to actually draw and group shapes? If I
get an answer from www-dom I'll report it here...

Manu



From jkrukoff at ltgc.com  Tue May 19 12:25:49 2009
From: jkrukoff at ltgc.com (John Krukoff)
Date: Tue, 19 May 2009 10:25:49 -0600
Subject: Best library to make XSLT 2.0 transformation
In-Reply-To: <77fk56F1fg5c6U1@mid.uni-berlin.de>
References: <7fa6e7f2-00ae-4b9b-86a2-0ce62b9914d1@q14g2000vbn.googlegroups.com>
	<77fk56F1fg5c6U1@mid.uni-berlin.de>
Message-ID: <1242750349.13846.10.camel@localhost.localdomain>

On Tue, 2009-05-19 at 13:42 +0200, Diez B. Roggisch wrote:
> wdveloper wrote:
> 
> > Hi there,
> > 
> > I need to make xml transformation using XSLT 2.0 (since i want to use
> > the powerful tag <xsl:result-document> to produce multiple files).
> > In your experience, which kind of library out there is better?
> 
> XSLT is a standard, so if you find a library that implements it, there
> shouldn't be much differences.
> 
> Having said that, these days lxml2 is the craze, and it contains
> xslt-processing. It would be my first (and hopefully last) stop.
> 
> Diez

While I firmly believe lxml is the best python XML library available,
being built on libxml2 means that it only supports XSLT 1.0. As far as I
know, if you want 2.0 support, you still need to be using one of the
Java XSLT processors.
-- 
John Krukoff <jkrukoff at ltgc.com>
Land Title Guarantee Company



From google at mrabarnett.plus.com  Tue May 19 12:34:57 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 19 May 2009 17:34:57 +0100
Subject: how to get the spesific line of the text in the clipboard
In-Reply-To: <4A12DBE1.8030108@tim.thechases.com>
References: <mailman.1476.1242744869.8014.python-list@python.org>	<4A12D0AA.9060407@sina.com>
	<4A12D986.4050900@mrabarnett.plus.com>
	<4A12DBE1.8030108@tim.thechases.com>
Message-ID: <4A12DFB1.4030109@mrabarnett.plus.com>

Tim Chase wrote:
>>> I want to get the eighth line in the text of the text in the 
>>> clipboad, but when I call  GetClipboardData
>>> I only get a string, how can I repair it?
>> [snip]
>>
>> Split the string into lines and take the eighth line (at index 7). I've
>> limited the number of splits to 8 because I'm not interested in any of
>> the following lines:
>>
>>      line = text.split("\r\n", 8)[7]
> 
> Strings have a .splitlines() method that makes this a little more elegant:
> 
>   line = text.splitlines()[7]
> 
I thought it split only on "\n". Turns out it can handle "\r\n" too!
Yay! :-)


From gabriel.rossetti at arimaz.com  Tue May 19 12:52:14 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Tue, 19 May 2009 18:52:14 +0200
Subject: UDP reading on multiple sockets
In-Reply-To: <27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net>
	<15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>
	<27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
Message-ID: <4A12E3BE.20006@arimaz.com>

thomas.vogel at likeabird.de wrote:
> On 17 Mai, 04:22, Grant Edwards <gra... at visi.com> wrote:
>   
>> On 2009-05-17, Thomas Vogel <thomas.vo... at likeabird.de> wrote:
>>
>>     
>>> I'm currently have the problem that I try to read UDP messages from
>>> multiple sockets in parallel. So let's say I get UDP packets from the
>>> same IP on the ports 2000, 2001, 2002,...
>>>       
>> Is there any reason you can't do it the easy way by using
>> select?
>>
>> http://docs.python.org/library/select.html
>>
>> --
>> Grant
>>     
>
> The only honest answer would be that I'm totaly unfamiliar with select
> and also the documentation I found wasn't able to clear the picture.
> So are there examples of using select together with sockets available?
>
> Kind regards
> Thomas
>   
You could also try Twisted : http://twistedmatrix.com/trac/

Best,
Gabriel


From aahz at pythoncraft.com  Tue May 19 13:00:37 2009
From: aahz at pythoncraft.com (Aahz)
Date: 19 May 2009 10:00:37 -0700
Subject: python3 module for dbus ?
References: <4a1281ef$0$90271$14726298@news.sunsite.dk>
Message-ID: <guuojl$l9g$1@panix3.panix.com>

In article <4a1281ef$0$90271$14726298 at news.sunsite.dk>,
Timothy Madden  <terminatorul at gmail.com> wrote:
>
>Sorry if this is not the right newsgroup for python modules, I found no 
>other appropriate one.

You're in the right place!

>I would like to start a project in python and I think it would be good 
>to start with python3.0, but I need tu use glib, dbus, wxWidgets and 
>postgresql.
>
>Do you know if I can get dbus bindings for python3 and glib bindings for 
>python3 ? Or could I use them otherwise (like without the modules) ?

Sorry, no answers to your questions off-hand, but what's wrong with
using 2.x?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From norseman at hughes.net  Tue May 19 13:02:56 2009
From: norseman at hughes.net (norseman)
Date: Tue, 19 May 2009 10:02:56 -0700
Subject: Which C compiler?
In-Reply-To: <slrnh15lso.2c4.grahn+nntp@frailea.sa.invalid>
References: <qc6Ql.290658$Za7.49182@en-nntp-08.dc1.easynews.com>	<4a11092f$0$30903$9b622d9e@news.freenet.de>	<1xjQl.357220$UQ6.31751@en-nntp-03.dc1.easynews.com>	<mailman.355.1242686909.8015.python-list@python.org>
	<slrnh15lso.2c4.grahn+nntp@frailea.sa.invalid>
Message-ID: <4A12E640.9000905@hughes.net>

Jorgen Grahn wrote:
> On Mon, 18 May 2009 15:47:41 -0700, norseman <norseman at hughes.net> wrote:
> 
>> I suspect that if all python users were in the same room and the 
>> question "Are you NOT happy with python's upgrade requirements?" was 
>> asked you would find most hands in the air.  I have said it before - the 
>> current attitude of 'new means we start over' was what nearly destroyed 
>> Apple. Doesn't take joe public long to get tired of constantly 
>> re-buying, re-writing themselves, re-hiring the same people to re-write 
>> the same thing, etc...
> 
> I dislike the "bleeding edge" aspect of Python culture too, but (as
> long as everyone ignores Python 3.0) it's not really something which
> hurts me in my daily life. *Not* using Python would hurt, though.
> 

agreed! emphatically so

> I'm on Linux though, and use no third-party modules which haven't
> already been filtered by Debian's maintainers. I don't know if that's
> the reason, but my applications rarely or never break.  So I'm not
> quite sure what happened in your case ...
> 

Linux, me too.  MY apps, same.   Coupling to vendor apps - busted.

> /Jorgen
> 

I cannot speak for the OP, but I have run into version problems as a 
result of dealing with purchased applications that use python as the (or 
one of the allowed) scripting languages for user written tweaks. As an 
example I'll use fictitious Company-One that released 9.1 which had no 
python. Then they released 9.2 which came with python 2.4 and then they 
released 9.3 which came with python 2.5(.1) plus the other languages 
like VBA that have been there all along. A program NOT using Company-One 
hooks but rather just the python itself (as in a small scientific 
calculator for use 'on the side') which was written in 2.4 will not run 
on 2.5. Who knows why. (The first error noted had to do with version 
miss-match.) It's these types of inconsistencies that are annoying. 
Since the place I work converted to Company-One's 9.3 and someone fixed 
the calculator to run on 2.5, I left the research into what might be the 
actual problem in a file somewhere. I believe it was a circular file. :)
I have my own calculator so I don't use the other one anyway.  :)

That scenario is probably the norm for most companies with more than one 
individual in them who use purchased applications and write in-house 
'scripts'.  The lack of upward compatibility is always annoying.

In all fairness to Python, it is not nearly as bad as VBA when it comes 
to breaking.  VBA quits when the OS version changes, when the VBA 
version changes, when the VB6 version changes.  It also seems to break 
each time sneeze. :)  Whereas when a given version of Python is loaded 
on both Linux and Windows I can samba a drive and use the same single 
one and only one file on both OSs at the same time if I wish, with the 
same certainty.  All except the fonts.  Three different Window machines 
all running the same OS release/patches and I get three different 
results for the same mono spaced font.  Go figure.



Steve


From gokhansever at gmail.com  Tue May 19 13:06:04 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Tue, 19 May 2009 12:06:04 -0500
Subject: Question about locals()
In-Reply-To: <pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
Message-ID: <49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>

Thank you all for great explanation on this subject. Maybe a few sentences
from these conversations could be added to locals() documentation.

I will make double sure myself while using locals() to end up with valid
identifiers.

G?khan


On Tue, May 19, 2009 at 1:06 AM, Steven D'Aprano <
steven at remove.this.cybersource.com.au> wrote:

> Sorry for breaking threading, the original post is not being carried by
> my ISP.
>
>
> On Tue, 19 May 2009, G?khan SEVER wrote:
> > Hello,
> >
> > Could you please explain why locals() allow me to create variables that
> > are not legal in Python syntax. Example: locals()['1abc'] = 55. Calling
> > of 1abc results with a syntax error. Shouldn't it be better to raise an
> > error during the variable creation time?
>
> No, because it isn't an error to use '1abc' as a dictionary key.
>
> "locals()['1abc'] = 55" does not create a variable. It creates an object
> 55, a string '1abc', and uses that string as the key in a dict with 55 as
> the value.
>
> "locals()['abc'] = 55" does not create a variable either. It does exactly
> the same thing as above, except that in this case 'abc' happens to be a
> valid identifier.
>
> "abc = 55" also does not create a variable. What it does is exactly the
> same as the above, except that the dictionary key is forced to be a valid
> identifier by the parser (or perhaps the lexer): the parser won't accept
> 1abc as a valid identifier, so you can't execute "1abc = 55".
>
> (Almost... there's actually a slight complication, namely that making
> changes to locals() inside a function does not work.)
>
> Python's programming model is based on namespaces, and namespaces are
> implemented as dictionaries: so-called "variables" are key/value pairs
> inside a dictionary. Just because a dictionary is used as a namespace
> doesn't stop it from being used as a dictionary: you can add any keys/
> values which would otherwise be valid. It's still a dictionary, just like
> any other dictionary.
>
> >>> globals()[45] = None
> >>> globals()
> {'__builtins__': <module '__builtin__' (built-in)>, 45: None, '__name__':
> '__main__', '__doc__': None}
>
>
> As for *why* this is done this way, the answer is simplicity of
> implementation. Dictionaries don't need to care about what counts as a
> valid identifier. Only the lexer/parser needs to care.
>
>
> --
> Steven
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From stefan_ml at behnel.de  Tue May 19 13:14:43 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 19 May 2009 19:14:43 +0200
Subject: Best library to make XSLT 2.0 transformation
In-Reply-To: <7fa6e7f2-00ae-4b9b-86a2-0ce62b9914d1@q14g2000vbn.googlegroups.com>
References: <7fa6e7f2-00ae-4b9b-86a2-0ce62b9914d1@q14g2000vbn.googlegroups.com>
Message-ID: <4a12e902$0$31871$9b4e6d93@newsspool3.arcor-online.net>

wdveloper wrote:
> I need to make xml transformation using XSLT 2.0 (since i want to use
> the powerful tag <xsl:result-document> to produce multiple files).
> In your experience, which kind of library out there is better?

I'm not aware of a Python library that implements XSLT 2.0, although you
might want to look around at the XQuery homepage, which links to a number
of candidates.

That said, if all you want is to generate multiple result documents from a
single XSLT, lxml will happily help you if you take a minute to implement a
custom XSLT element in Python that just writes an XSLT result to a file.

http://codespeak.net/lxml/extensions.html#xslt-extension-elements

Stefan


From jeanmichel at sequans.com  Tue May 19 13:28:42 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 19 May 2009 19:28:42 +0200
Subject: Import and absolute file names, sys.path including ''... or not
Message-ID: <4A12EC4A.4040409@sequans.com>

Hi fellows,

I spent quite a time on a malicious issue. I found out that there is a 
slight difference on the sys.path content when either executing code 
from a shell or from within a script.
This difference is the '' item, which is present in the shell form of 
sys.path.

For instance, let's write this code in test.py:
import sys
print sys.path

shell form:
python
Python 2.4.4 (#2, Oct 22 2008, 19:52:44)
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import test
['', other misc stuff] <- sys.path


script form:
python test.py
[other misc stuff] <- sys.path

The '' item is not here.

Problem is, '' is required for absolute path to be properly resolved. In 
my code I sometimes have to import file in that way : 
__import__('/some/absolute/path')

So the immediate solution is to write this:
if '' not in sys.path:
    sys.path.append('') # make sure absolute path are properly resolved 
in any case

I'm not a big fan of manipulating sys.path at the begining of my files. 
Is there something I'm doing wrong ? Is there a standard/nice way to 
support absolute path ? I guess '' is in fact aimed at resolving 
relative path from the execution directory...

best regards,

Jean-Michel


From suruti94 at gmail.com  Tue May 19 13:32:46 2009
From: suruti94 at gmail.com (Mohan Parthasarathy)
Date: Tue, 19 May 2009 10:32:46 -0700
Subject: Performance java vs. python
Message-ID: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>

On Mon, May 18, 2009 at 5:56 AM, Aahz <aahz at pythoncraft.com> wrote:

> In article <mff7e6-e43.ln1 at satorlaser.homedns.org>,
> Ulrich Eckhardt  <eckhardt at satorlaser.com> wrote:
> >Steve Ferg wrote:
> >>
> >> On the one hand, there are developers who love big IDEs with lots of
> >> features (code generation, error checking, etc.), and rely on them to
> >> provide the high level of support needed to be reasonably productive
> >> in heavy-weight languages (e.g. Java).
> >>
> >> On the other hand there are developers who much prefer to keep things
> >> light-weight and simple.  They like clean high-level languages (e.g.
> >> Python) which are compact enough that you can keep the whole language
> >> in your head, and require only a good text editor to be used
> >> effectively.
> >
> >This distinction is IMHO not correct. If you took a look at Java, you
> would
> >notice that the core language syntax is much simpler than Python's.
>
> That's half-true.  The problem is that you have to digest a much bigger
> chunk of Java before you can start being productive.  Consider how simple
> it is to write a non-regex grep in Python.  In addition, Python's object
> model is simpler than Java's, not even talking about the contortions that
> Java's static class model forces you into.


I am new to Python. I am slowly realizing that Python might be a better
choice when compared to java on the server side. Is there any performance
comparison between Java and Python ? For example, if I use the J2EE solution
vs. python (Django etc.) on the server side, would one perform better over
the other ?

-mohan

P.S: I have changed the subject line to reflect the new thread

>
> --
> Aahz (aahz at pythoncraft.com)           <*>
> http://www.pythoncraft.com/
>
> "In 1968 it took the computing power of 2 C-64's to fly a rocket to the
> moon.
> Now, in 1998 it takes the Power of a Pentium 200 to run Microsoft Windows
> 98.
> Something must have gone wrong."  --/bin/fortune
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From fetchinson at googlemail.com  Tue May 19 13:42:28 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Tue, 19 May 2009 10:42:28 -0700
Subject: Performance java vs. python
In-Reply-To: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
Message-ID: <fbe2e2100905191042g59b7522ajd09353fc88dbcf2e@mail.gmail.com>

>> >> On the one hand, there are developers who love big IDEs with lots of
>> >> features (code generation, error checking, etc.), and rely on them to
>> >> provide the high level of support needed to be reasonably productive
>> >> in heavy-weight languages (e.g. Java).
>> >>
>> >> On the other hand there are developers who much prefer to keep things
>> >> light-weight and simple.  They like clean high-level languages (e.g.
>> >> Python) which are compact enough that you can keep the whole language
>> >> in your head, and require only a good text editor to be used
>> >> effectively.
>> >
>> >This distinction is IMHO not correct. If you took a look at Java, you
>> would
>> >notice that the core language syntax is much simpler than Python's.
>>
>> That's half-true.  The problem is that you have to digest a much bigger
>> chunk of Java before you can start being productive.  Consider how simple
>> it is to write a non-regex grep in Python.  In addition, Python's object
>> model is simpler than Java's, not even talking about the contortions that
>> Java's static class model forces you into.
>
>
> I am new to Python. I am slowly realizing that Python might be a better
> choice when compared to java on the server side. Is there any performance
> comparison between Java and Python ? For example, if I use the J2EE solution
> vs. python (Django etc.) on the server side, would one perform better over
> the other ?

Benchmarks always test for a given feature. The available benchmarks
will most likely not test the feature relevant for your particular
application simply because there are about a gazillion different ways
of using a web framework. So the best you can do is simply test the
bottleneck part of your application and see for yourself, otherwise
you will be left with comments like "django is used at work because
it's faster for us" or "I use j2ee because performance is better for
my web app". When it will come to choosing your framework these will
help little to none.

Cheers,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From norseman at hughes.net  Tue May 19 13:43:45 2009
From: norseman at hughes.net (norseman)
Date: Tue, 19 May 2009 10:43:45 -0700
Subject: Python, Tkinter and popen problem
Message-ID: <4A12EFD1.2090206@hughes.net>

I have come across a problem that, as I understand all documentation I
have found, should not exist.

Python version is 2.5.2, Tinker in that package.
Linux Slackware 10.2

I went to test os.popen and got mixed answers.

         1) IF  os.popen opens a command line or command window type
            THEN  the read and writes work as expected
         2) IF  os.popen opens a Tkinter contained python program
            THEN  the read is not consistant and write to it fails.

OK - #1 runs as expected on shell scripts and other programs that were
         written for the keyboard and redirectors only. (non GUI types)

      #2 popen sometimes connects to stdout OF the child and sometimes
         not and has never shown signs of connection to stdin OF child

The Tkinter usage has three (3) print statements. Two (2) never show up.
One does. The one that does is the exit notice.

In the 'child' program;  print, sys.stdout.write(string), and 
os.write(stdout,string) all work for the one that does write back, but
none work for the two that do not. Don't get picky on the syntax, the
purpose is to get the message across.


The print statements are:
print "Notice of action"
print VariableHavingTextOfAction

print "Closing down\n"

Yes I added the '\n' to the others - no change.

Same loop reads/prints the stdout FROM child in all three cases.

All three work fine when Tkinter included program is run 'solo'.
Print statements show up in the text (command, whatever) window.
The entire Tkinter included program runs normally except for the I/O
linkage problem when using os.popen(.....  or Popen2.popen2 or ... then
only third print shows up in text window. Acts as if first two prints
were captured but never forwarded to screen.  If it was a case of not
sending until a system flush() took place then all three lines would
appear at the closing.  That is NOT happening. Only closing notice appears.

The child has a pause expecting a keystroke from the master immediately
following the print VariableH...   which apparently is never received.


This is a case of Python running a Python program that contains Tkinter.


So what is going on and what can I do?
I want the master to echo the slave's print statements and the slave get
the 'continue' character so it will.

Today is: 20090519
Versions noted above.

Steve



From hackingkk at gmail.com  Tue May 19 14:09:19 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Tue, 19 May 2009 23:39:19 +0530
Subject: Performance java vs. python
In-Reply-To: <fbe2e2100905191042g59b7522ajd09353fc88dbcf2e@mail.gmail.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<fbe2e2100905191042g59b7522ajd09353fc88dbcf2e@mail.gmail.com>
Message-ID: <1242756559.3669.16.camel@kk-laptop>

On Tue, 2009-05-19 at 10:42 -0700, Daniel Fetchinson wrote:
> Benchmarks always test for a given feature. The available benchmarks
> will most likely not test the feature relevant for your particular
> application simply because there are about a gazillion different ways
> of using a web framework. So the best you can do is simply test the
> bottleneck part of your application and see for yourself, <snip>
Bingo! there will be hundreds of threads on this mailing list and many
others which exactly do that.  And it also serves as a great food for
those bashing birds who just need a spart to start a flamewar.

Till date I have worked with both languages into their core as will as
with many libraries for different tasks.

Fortunately I have some assessment for web frameworks which is based
mostly on my personal experience and partially on some obvious facts.

At the outset, I have seen that python's syntax is pritty clean and as
some previous mail said on this thread, it needs just a few hours and
the language is compact enough to fit in your head.
Readers might ask, "so how is this associated with performance boosting
etc?"  
Quite a good question.  You see, the scope for making quick and suttle
changes in the code should be wide enough and easy to do as wel.

Since python has such easy and clean syntax and with the idea of
"battries included ", it is much more quicker and easier to tune the
application for many things including performance.

Since I feel comfortable with the language I am confident enough that my
code won't break too much when I try to do some serious alteration to
the code.  This alteration might now be to change the logic but to
improve performance.  This is the challenge and python is such a
language that manipulating to this level is pritty doable in short
period of time.

Secondly, Java it seems comes with a lot of bagage which might be the
case with python as well.  But some how I don't know, python seems to be
much light weight then java.
May be there are many technical reasons for this and at the web
application side it seems to be compact zippi and fast.  Again this
might be my personal assessment,and specially with database driven
application, no language can be absolutely better than the other and as
rightly suggested, test it on the bottleneck issues and fine tune that
particular part.  I have seen many apps migrating from ejb based
framework to python, particularly one I remember in pylons and the
feedback has been positive.
 
Another thing is that I personally like to use OOP *only* when needed.
Java would force me to write classes (add the over doing with static
functions ) for every thing I do including a small function just for
returning a connection object.

This again is a major reason for me to stick to python.

In addition python also can do the kind of work, j2ME can do and so I
don't think there is any serious reason for choosing java over python.
I am currently developing a major application and it is currently using
the twisted library for xmlrpc and there is a thin client in pygtk.
Right now we are in the process of moving it to turbogears2 and so far
performance on both the ends have been good.

happy hacking.
Krishnakant.



From jeremy at martinfamily.freeserve.co.uk  Tue May 19 14:15:52 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Tue, 19 May 2009 11:15:52 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
Message-ID: <e31643b2-43f1-48a5-b7c6-3930c7232af0@o30g2000vbc.googlegroups.com>

On 19 May, 10:24, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:
> > Let me clarify what I think par, pmap, pfilter and preduce would mean
> > and how they would be implemented.
>
> [...]
>
> Just for fun, I've implemented a parallel-map function, and done a couple
> of tests. Comments, criticism and improvements welcome!
>
> import threading
> import Queue
> import random
> import time
>
> def f(arg): ?# Simulate a slow function.
> ? ? time.sleep(0.5)
> ? ? return 3*arg-2
>
> class PMapThread(threading.Thread):
> ? ? def __init__(self, clients):
> ? ? ? ? super(PMapThread, self).__init__()
> ? ? ? ? self._clients = clients
> ? ? def start(self):
> ? ? ? ? super(PMapThread, self).start()
> ? ? def run(self):
> ? ? ? ? while True:
> ? ? ? ? ? ? try:
> ? ? ? ? ? ? ? ? data = self._clients.get_nowait()
> ? ? ? ? ? ? except Queue.Empty:
> ? ? ? ? ? ? ? ? break
> ? ? ? ? ? ? target, where, func, arg = data
> ? ? ? ? ? ? result = func(arg)
> ? ? ? ? ? ? target[where] = result
>
> class VerbosePMapThread(threading.Thread):
> ? ? def __init__(self, clients):
> ? ? ? ? super(VerbosePMapThread, self).__init__()
> ? ? ? ? print "Thread %s created at %s" % (self.getName(), time.ctime())
> ? ? def start(self):
> ? ? ? ? super(VerbosePMapThread, self).start()
> ? ? ? ? print "Thread %s starting at %s" % (self.getName(), time.ctime())
> ? ? def run(self):
> ? ? ? ? super(VerbosePMapThread, self).run()
> ? ? ? ? print "Thread %s finished at %s" % (self.getName(), time.ctime())
>
> def pmap(func, seq, verbose=False, numthreads=4):
> ? ? size = len(seq)
> ? ? results = [None]*size
> ? ? if verbose:
> ? ? ? ? print "Initiating threads"
> ? ? ? ? thread = VerbosePMapThread
> ? ? else:
> ? ? ? ? thread = PMapThread
> ? ? datapool = Queue.Queue(size)
> ? ? for i in xrange(size):
> ? ? ? ? datapool.put( (results, i, f, seq[i]) )
> ? ? threads = [PMapThread(datapool) for i in xrange(numthreads)]
> ? ? if verbose:
> ? ? ? ? print "All threads created."
> ? ? for t in threads:
> ? ? ? ? t.start()
> ? ? # Block until all threads are done.
> ? ? while any([t.isAlive() for t in threads]):
> ? ? ? ? if verbose:
> ? ? ? ? ? ? time.sleep(0.25)
> ? ? ? ? ? ? print results
> ? ? return results
>
> And here's the timing results:
>
> >>> from timeit import Timer
> >>> setup = "from __main__ import pmap, f; data = range(50)"
> >>> min(Timer('map(f, data)', setup).repeat(repeat=5, number=3))
> 74.999755859375
> >>> min(Timer('pmap(f, data)', setup).repeat(repeat=5, number=3))
>
> 20.490942001342773
>
> --
> Steven

Hi Steven,

I am impressed by this - it shows the potential speedup that pmap
could give. Although the GIL would be a problem as things for speed up
of pure Python code. Do Jython and Iron Python include the threading
module?

Jeremy


From jeremy at martinfamily.freeserve.co.uk  Tue May 19 14:29:25 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Tue, 19 May 2009 11:29:25 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<c26b61e0-ee42-411b-a689-1f47e98f332a@r3g2000vbp.googlegroups.com>
Message-ID: <b22a0e8d-e19f-4ed7-b7a3-a04163641f57@u10g2000vbd.googlegroups.com>

On 17 May, 13:37, jer... at martinfamily.freeserve.co.uk wrote:
> On 17 May, 13:05, jer... at martinfamily.freeserve.co.uk wrote:> From a user point of view I think that adding a 'par' construct to
> > Python for parallel loops would add a lot of power and simplicity,
> > e.g.
>
> > par i in list:
> > ? ? updatePartition(i)
>
> ...actually, thinking about this further, I think it would be good to
> add a 'sync' keyword which causes a thread rendezvous within a
> parallel loop. This would allow parallel loops to run for longer in
> certain circumstances without having the overhead of stopping and
> restarting all the threads, e.g.
>
> par i in list:
> ? ? for j in iterations:
> ? ? ? ?updatePartion(i)
> ? ? ? ?sync
> ? ? ? ?commitBoundaryValues(i)
> ? ? ? ?sync
>
> This example is a typical iteration over a grid, e.g. finite elements,
> calculation, where the boundary values need to be read by neighbouring
> partitions before they are updated. It assumes that the new values of
> the boundary values are stored in temporary variables until they can
> be safely updated.
>
> Jeremy

I have coded up a (slightly) more realistic example. Here is a code to
implement the numerical solution to Laplace's equation, which can
calculate the values of a potential field across a rectangular region
given fixed boundary values:

xmax = 200
ymax = 200
niterations = 200

# Initialisation
old=[[0.0 for y in range(ymax)] for x in range(xmax)]
for x in range(xmax):
    old[x][0] = 1.0
for y in range(ymax):
    old[0][y] = 1.0
new=[[old[x][y] for y in range(ymax)] for x in range(xmax)]

# Iterations
for i in range(1,100):
    print "Iteration: ", i
    for x in range(1,ymax-1):
        for y in range(1, xmax-1):
	    new[x][y] = \
	    0.25*(old[x-1][y] + old[x+1][y] + old[x][y-1] + old[x-1][y])
    # Swap over the new and old storage arrays
    tmp = old
    old = new
    new = tmp


# Print results
for y in range(ymax):
    for x in range(xmax):
        print str(old[x][y]).rjust(7),
    print

In order to parallelise this with the par construct would require a
single alteration to the iteration section:

for i in range(1,100):
    print "Iteration: ", i
    par x in range(1,ymax-1):
        for y in range(1, xmax-1):
	    new[x][y] = \
	    0.25*(old[x-1][y] + old[x+1][y] + old[x][y-1] + old[x-1][y])
    # Swap over the new and old storage arrays
    tmp = old
    old = new
    new = tmp

The par command tells python that it may choose to fire up multiple
threads and automatically partition the data between them. So, for
instance, if there were ten threads created each one would work on a
sub-range of x values: thread 1 takes x from 1 to 100, thread 2 takes
x from 101 to 200, etc.

However with this approach there is an overhead in each iteration of
starting up the threads and shutting them down again. Depending on the
impact of this overhead, it might be better to keep the threads
running between iterations by modifying the code like this, adding a
'sync' command to synchronise the threads at the end of each iteration
and also making sure that only one of the threads performs the swap of
the data arrays.

par x in range(1,ymax-1):
    for i in range(1,100):
    if __thread__ == 0: print "Iteration: ", i
        for y in range(1, xmax-1):
	    new[x][y] = \
	    0.25*(old[x-1][y] + old[x+1][y] + old[x][y-1] + old[x-1][y])
    # Swap over the new and old storage arrays
    sync
    if __thread__ == 0:
        tmp = old
        old = new
        new = tmp
    sync

Jeremy






From deets at nospam.web.de  Tue May 19 14:33:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 19 May 2009 20:33:33 +0200
Subject: Adding a Par construct to Python?
In-Reply-To: <e31643b2-43f1-48a5-b7c6-3930c7232af0@o30g2000vbc.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
	<e31643b2-43f1-48a5-b7c6-3930c7232af0@o30g2000vbc.googlegroups.com>
Message-ID: <77gcbtF1h49omU1@mid.uni-berlin.de>

> 
> Hi Steven,
> 
> I am impressed by this - it shows the potential speedup that pmap
> could give. Although the GIL would be a problem as things for speed up
> of pure Python code. Do Jython and Iron Python include the threading
> module?


Jython does, and AFAIK IronPython also. Jython also has no GIL I think, 
for IronPython I don't know that.

Diez


From deets at nospam.web.de  Tue May 19 14:34:32 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 19 May 2009 20:34:32 +0200
Subject: Best library to make XSLT 2.0 transformation
In-Reply-To: <mailman.400.1242750955.8015.python-list@python.org>
References: <7fa6e7f2-00ae-4b9b-86a2-0ce62b9914d1@q14g2000vbn.googlegroups.com>	<77fk56F1fg5c6U1@mid.uni-berlin.de>
	<mailman.400.1242750955.8015.python-list@python.org>
Message-ID: <77gcdoF1h49omU2@mid.uni-berlin.de>

John Krukoff schrieb:
> On Tue, 2009-05-19 at 13:42 +0200, Diez B. Roggisch wrote:
>> wdveloper wrote:
>>
>>> Hi there,
>>>
>>> I need to make xml transformation using XSLT 2.0 (since i want to use
>>> the powerful tag <xsl:result-document> to produce multiple files).
>>> In your experience, which kind of library out there is better?
>> XSLT is a standard, so if you find a library that implements it, there
>> shouldn't be much differences.
>>
>> Having said that, these days lxml2 is the craze, and it contains
>> xslt-processing. It would be my first (and hopefully last) stop.
>>
>> Diez
> 
> While I firmly believe lxml is the best python XML library available,
> being built on libxml2 means that it only supports XSLT 1.0. As far as I
> know, if you want 2.0 support, you still need to be using one of the
> Java XSLT processors.


Ah, sorry, I missed the 2.0 requirement.

Diez


From suruti94 at gmail.com  Tue May 19 14:42:40 2009
From: suruti94 at gmail.com (Mohan Parthasarathy)
Date: Tue, 19 May 2009 11:42:40 -0700
Subject: Performance java vs. python
In-Reply-To: <fbe2e2100905191042g59b7522ajd09353fc88dbcf2e@mail.gmail.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<fbe2e2100905191042g59b7522ajd09353fc88dbcf2e@mail.gmail.com>
Message-ID: <89dd3da60905191142k45e77ec0g9558be3aa1efa30b@mail.gmail.com>

On Tue, May 19, 2009 at 10:42 AM, Daniel Fetchinson <
fetchinson at googlemail.com> wrote:

> >> >> On the one hand, there are developers who love big IDEs with lots of
> >> >> features (code generation, error checking, etc.), and rely on them to
> >> >> provide the high level of support needed to be reasonably productive
> >> >> in heavy-weight languages (e.g. Java).
> >> >>
> >> >> On the other hand there are developers who much prefer to keep things
> >> >> light-weight and simple.  They like clean high-level languages (e.g.
> >> >> Python) which are compact enough that you can keep the whole language
> >> >> in your head, and require only a good text editor to be used
> >> >> effectively.
> >> >
> >> >This distinction is IMHO not correct. If you took a look at Java, you
> >> would
> >> >notice that the core language syntax is much simpler than Python's.
> >>
> >> That's half-true.  The problem is that you have to digest a much bigger
> >> chunk of Java before you can start being productive.  Consider how
> simple
> >> it is to write a non-regex grep in Python.  In addition, Python's object
> >> model is simpler than Java's, not even talking about the contortions
> that
> >> Java's static class model forces you into.
> >
> >
> > I am new to Python. I am slowly realizing that Python might be a better
> > choice when compared to java on the server side. Is there any performance
> > comparison between Java and Python ? For example, if I use the J2EE
> solution
> > vs. python (Django etc.) on the server side, would one perform better
> over
> > the other ?
>
> Benchmarks always test for a given feature. The available benchmarks
> will most likely not test the feature relevant for your particular
> application simply because there are about a gazillion different ways
> of using a web framework. So the best you can do is simply test the
> bottleneck part of your application and see for yourself, otherwise
> you will be left with comments like "django is used at work because
> it's faster for us" or "I use j2ee because performance is better for
> my web app". When it will come to choosing your framework these will
> help little to none.


Ah! I should have been careful before asking such "general" question about
performance. I agree with you. But mine was more academic. I should not
given a specific example.

AFAIK, for java on the client side, JVM performance is one of the critical
things which has been tuned to death until now. Even Google's Android which
uses Java for the programming language uses a Dalvik Virtual machine which
was spefically designed to handle low CPU, memory and power environments.
Similarly, Python can also be used to program on Nokia phones etc. Of course
programming natively (C/C++) would make a difference in environments where
CPU, memory and power are a big constraint. Given the context, do we know
how Python compares with Java or even native programming. What is the
overhead of  Python's interpreted code ? Some standard benchmarks would help
compare apples to apples  though it may not help deciding which framework to
choose.

-mohan


>
> Cheers,
> Daniel
>
> --
> Psss, psss, put it down! - http://www.cafepress.com/putitdown
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steko at iosa.it  Tue May 19 14:54:12 2009
From: steko at iosa.it (Stefano Costa)
Date: Tue, 19 May 2009 20:54:12 +0200
Subject: package with executable
Message-ID: <1242759252.4438.114.camel@gibreel>

Hi,
my name is Stefano Costa, I am an archaeologist and I am developing
GNUCal, a radiocarbon calibration program released under the GNU GPL.
[1][2]

Currently the program consists of a small "library", largely based on
Matplotlib and Numpy, and a command line program. My goal is to create a
distributable package, that should ideally contain both the "gnucal"
package and the command line program.

As you can see in the source code [3], I am following some sort of
standard layout for my project, but some things aren't still clear to
me, even after reading setuptools' documentation and looking to the
source of some known Python packages (like sphinx, pastescript, django):
      * where should the executable module be wrt setup.py and/or the
        package directory in the source tree
      * how should I format the console_scripts entry in setup() to make
        the executable module available to the system PATH after
        installing
      * how should I call the "gnucal" package from inside the
        executable script (currently I'm using "from gnucal import core"
        but it doesn't seem to work)

I'm using virtualenv to create testing environments for the install
process, and my Python is 2.5.4 on Debian Sid.

Any suggestion is appreciated, particularly if there are some real
examples to draw from.

thanks,
steko

[1] http://gnucal.iosa.it/
[2] http://en.wikipedia.org/wiki/Radiocarbon_dating#Calibration
[3] http://bitbucket.org/steko/gnucal/

-- 
Stefano Costa
http://www.iosa.it/ Open Archaeology
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From debatem1 at gmail.com  Tue May 19 15:00:10 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 19 May 2009 12:00:10 -0700 (PDT)
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com> 
	<mailman.407.1242754952.8015.python-list@python.org>
Message-ID: <38b7ea25-7ad0-4225-b8a6-8ea7b371b7d7@b1g2000vbc.googlegroups.com>

> Ah! I should have been careful before asking such "general" question about performance. I agree with you. But mine was more academic. I should not given a specific example.
>
> AFAIK, for java on the client side, JVM performance is one of the critical things which has been tuned to death until now. Even Google's Android which uses Java for the programming
> language uses a Dalvik Virtual machine which was spefically designed to handle low CPU, memory and power environments. Similarly, Python can also be used to program on Nokia phones etc. > Of course programming natively (C/C++) would make a difference in environments where CPU, memory and power are a big constraint. Given the context, do we know how Python compares with
> Java or even native programming. What is the overhead of  Python's interpreted code ? Some standard benchmarks would help compare apples to apples  though it may not help deciding which > framework to choose.
>
> -mohan

Danger, will robinson- the dalvik jvm has precisely nothing to do with
standard
java. It uses the same syntax but otherwise operates entirely
differently. Don't
assume you'll get the same performance characteristics out of the
other common
jvm's.

Geremy Condra


From slbentley at gmail.com  Tue May 19 16:40:33 2009
From: slbentley at gmail.com (Scooter)
Date: Tue, 19 May 2009 13:40:33 -0700 (PDT)
Subject: Mock Form Post
Message-ID: <99c7e9d6-b1b2-4343-bbae-b01e0e640fb7@z5g2000vba.googlegroups.com>

Let me qualify this by saying I'm very new to python. I'm doing some
work with mod_python and in a function I have defined I am passing in
the form and then iterating through the form keys. I'm currently
writing my unit tests and I'm trying to mock up a form object with
kids so I can emulate my true form post. So I'm attempting to mock up
a class that I'm calling "_Fakeform".  I'm lost on how I should do it
though. I thought by creating a dictionary object with key value pairs
that would satisfy my need but I'm not sure how to get at it when I
pass my mocked class in.


From rhamph at gmail.com  Tue May 19 16:43:16 2009
From: rhamph at gmail.com (Adam Olsen)
Date: Tue, 19 May 2009 13:43:16 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<c5d47090-7f79-4297-b7a0-3094a3fbd446@k9g2000pra.googlegroups.com> 
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com> 
	<a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com> 
	<349328ba-e396-46aa-ac4b-ae5d7c2796a9@v17g2000vbb.googlegroups.com>
Message-ID: <64a76765-3759-40dc-8b92-3eca0a304481@21g2000vbk.googlegroups.com>

On May 19, 5:05?am, jer... at martinfamily.freeserve.co.uk wrote:
> Thanks for explaining a few things to me. So it would seem that
> replacing the GIL with something which allows better scalability of
> multi-threaded applications, would be very complicated. The paper by
> Jesse Nolle which I referenced in my original posting includes the
> following:
>
> "In 1999 Greg Stein created a patch set for the interpreter that
> removed the GIL, but added granular locking around sensitive
> interpreter operations. This patch set had the direct effect of
> speeding up threaded execution, but made single threaded execution two
> times slower."
>
> Source:http://jessenoller.com/2009/02/01/python-threads-and-the-global-inter...
>
> That was ten years ago - do you have any idea as to how things have
> been progressing in this area since then?

https://launchpad.net/python-safethread


From jeff at jmcneil.net  Tue May 19 16:47:28 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Tue, 19 May 2009 13:47:28 -0700 (PDT)
Subject: package with executable
References: <mailman.411.1242760431.8015.python-list@python.org>
Message-ID: <10af10fc-adbd-4c46-bf4c-21e87e48bb63@t10g2000vbg.googlegroups.com>

On May 19, 2:54?pm, Stefano Costa <st... at iosa.it> wrote:
> Hi,
> my name is Stefano Costa, I am an archaeologist and I am developing
> GNUCal, a radiocarbon calibration program released under the GNU GPL.
> [1][2]
>
> Currently the program consists of a small "library", largely based on
> Matplotlib and Numpy, and a command line program. My goal is to create a
> distributable package, that should ideally contain both the "gnucal"
> package and the command line program.
>
> As you can see in the source code [3], I am following some sort of
> standard layout for my project, but some things aren't still clear to
> me, even after reading setuptools' documentation and looking to the
> source of some known Python packages (like sphinx, pastescript, django):
> ? ? ? * where should the executable module be wrt setup.py and/or the
> ? ? ? ? package directory in the source tree
> ? ? ? * how should I format the console_scripts entry in setup() to make
> ? ? ? ? the executable module available to the system PATH after
> ? ? ? ? installing
> ? ? ? * how should I call the "gnucal" package from inside the
> ? ? ? ? executable script (currently I'm using "from gnucal import core"
> ? ? ? ? but it doesn't seem to work)
>
> I'm using virtualenv to create testing environments for the install
> process, and my Python is 2.5.4 on Debian Sid.
>
> Any suggestion is appreciated, particularly if there are some real
> examples to draw from.
>
> thanks,
> steko
>
> [1]http://gnucal.iosa.it/
> [2]http://en.wikipedia.org/wiki/Radiocarbon_dating#Calibration
> [3]http://bitbucket.org/steko/gnucal/
>
> --
> Stefano Costahttp://www.iosa.it/Open Archaeology
>
> ?signature.asc
> < 1KViewDownload

So, I've got a couple packages where I've used the same method.
Generally, I've formatted my entry_points argument as follows:

entry_points = {
      'console_scripts': [ 'xmlrpctool =
hostapi.clients.xmlrpc:main' ]
   },

It's just a dictionary with a 'console_scripts' key. The value is a
list of wrapper scripts that are to be installed along with the
library files. In this scenario, I'm installing a wrapper script
called 'xmlrpctool' which calls a function named main in the xmlrpc
module within my hostapi.clients package. SetupTools generates that
wrapper for you.

That main function can be any callable. Looking at the way you've
formatted your gnucal.py script, I'm not sure it's going to work
without a bit of modification.

My personal approach would be to move that code into your gnucal
directory, either as it's own module or within one of the existing,
and implement it as a "main" function.

Then an entry_points line such as the following will make sure
'gnucal' gets installed in a directory on your path:

entry_points = {
      'console_scripts': [ 'gnucal = gnucal.core:main' ]
   },

This, of course, assumes that you move your main function into
'gnucal.core.'

HTH,

Jeff
mcjeff.blogspot.com



From slbentley at gmail.com  Tue May 19 17:02:30 2009
From: slbentley at gmail.com (Scooter)
Date: Tue, 19 May 2009 14:02:30 -0700 (PDT)
Subject: Mock Form Post
References: <99c7e9d6-b1b2-4343-bbae-b01e0e640fb7@z5g2000vba.googlegroups.com>
Message-ID: <13e11ed4-8c40-4973-ab45-87e3e41bfb3b@m24g2000vbp.googlegroups.com>

On May 19, 3:40?pm, Scooter <slbent... at gmail.com> wrote:
> Let me qualify this by saying I'm very new to python. I'm doing some
> work with mod_python and in a function I have defined I am passing in
> the form and then iterating through the form keys. I'm currently
> writing my unit tests and I'm trying to mock up a form object with
> kids so I can emulate my true form post. So I'm attempting to mock up
> a class that I'm calling "_Fakeform". ?I'm lost on how I should do it
> though. I thought by creating a dictionary object with key value pairs
> that would satisfy my need but I'm not sure how to get at it when I
> pass my mocked class in.

1 strike against me for poor proof reading.
1) While I did mention mod_python I didn't say I was referring to an
HTML form.
2) I said I'm trying to mock up a form object with "kids". No idea how
I messed that up, but it should be "keys"


From rsarpi at gmail.com  Tue May 19 17:07:37 2009
From: rsarpi at gmail.com (icarus)
Date: Tue, 19 May 2009 14:07:37 -0700 (PDT)
Subject: optparse options
Message-ID: <dd64aed2-ca3a-4f5e-8d22-d78aa52bb027@d38g2000prn.googlegroups.com>

Why do I need to put two options for this script to print the path?

if I just specify the option and argument...
$ python <script>.py -p xxxx
Usage: <script>.py [-p dir] [--part=dir]

<script>.py: error: No options specified

So I need to give it two arguments...
$ python <script>.py --part xxxx y
xxxx


Desired output:
$ python <script>.py --part xxxx
xxxx

$ python <script>.py --part xxxx y
Usage: <script>.py [-p dir] [--part=dir]
<script>.py: error: some message


----
#/usr/bin/python

import optparse

def main():
	parser = optparse.OptionParser(usage="%prog [-p dir] [--part=dir] ",
version="%prog 1.0")

	parser.add_option( "-p", "--part", dest="directory",
	                  help="process target directory", metavar="dir")
	(options, args) = parser.parse_args()

	if len(args) != 1:
		parser.error("No options specified")


	path = options.directory
	print path

if __name__ == "__main__":
	main()


From nytrokiss at gmail.com  Tue May 19 17:21:16 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Wed, 20 May 2009 00:21:16 +0300
Subject: Advanced Python books?
In-Reply-To: <77g2nbF1h267rU1@mid.individual.net>
References: <gusevn$jjd$1@reader1.panix.com>
	<77g2nbF1h267rU1@mid.individual.net>
Message-ID: <8a6b8e350905191421p4c0d3ccbmfad635f5a18d78bd@mail.gmail.com>

I found Core Python Programming to cater to my needs as a Pro book.

On Tue, May 19, 2009 at 6:48 PM, Thomas Guettler <hv at tbz-pariv.de> wrote:

> kj schrieb:
> > I have read a couple of "learn Python"-type books, and now I'm
> > looking for some more advanced books on Python,
> ...
> > Basically I'm looking for a book that assumes that one has the
> > basics of the language down, and instead focuses on standard problems
> > of software development, such as application architecture and
> > design, prototyping, debugging, profiling and performance-tuning,
> > testing, packaging/distribution, extending/embedding, threading
> > and IPC, persistence, etc., and on various prototypical cases such
> > as command-line utilities, GUI-apps, webapps, database-backed apps,
> > simulations, etc.
>
> I think there is no such book. Maybe the Python Cookbook comes near.
>
> webapps: I use django, other use turbogears, other even different stuff...
> There are several books about e.g. django. It would be hard to
> put all the magic of all web apps into one chapter.
>
> GUI-apps: You can use tkinter, qt or gtk.... again it would be hard
> to put something useable into one chapter.
>
>   Thomas
>
> --
> Thomas Guettler, http://www.thomas-guettler.de/
> E-Mail: guettli (*) thomas-guettler + de
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.astorandblack.com
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From walterbyrd at iname.com  Tue May 19 17:38:19 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Tue, 19 May 2009 14:38:19 -0700 (PDT)
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
Message-ID: <940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>

On May 8, 5:55?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> On May 8, 3:03?pm,walterbyrd<walterb... at iname.com> wrote:
>
> > This works, but it seems like there should be a better way.
>
> > --------------
> > week = ['sun','mon','tue','wed','thu','fri','sat']
> > for day in week[week.index('tue'):week.index('fri')]:
> > ? ?print day
> > ---------------
>
> I think you should provide much more information, primarily why you
> want to do this. ?What is the larger goal you are trying to achieve?

I am just looking for a less verbose, more elegant, way to print a
slice of a list. What is hard to understand about that? I am not sure
how enumerated types help.


From namekuseijin at gmail.com  Tue May 19 17:43:34 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Tue, 19 May 2009 18:43:34 -0300
Subject: Performance java vs. python
In-Reply-To: <mailman.407.1242754952.8015.python-list@python.org>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.407.1242754952.8015.python-list@python.org>
Message-ID: <guv968$2l5j$1@adenine.netfront.net>

someone said:
>>>> If you took a look at Java, you would
>>>> notice that the core language syntax is much simpler than Python's.

thanks for the laughs whoever you are!

-- 
a game sig: http://tinyurl.com/d3rxz9


From paul at boddie.org.uk  Tue May 19 17:44:30 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Tue, 19 May 2009 14:44:30 -0700 (PDT)
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
	<4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>
	<3b84542c-7746-498d-8d9e-977deaecfc1d@r3g2000vbp.googlegroups.com>
	<77g46cF1h8ffnU1@mid.uni-berlin.de>
Message-ID: <954320a5-10ef-41f3-8a08-c1163be19206@e23g2000vbe.googlegroups.com>

On 19 Mai, 18:16, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> Sorry to say so, but that's nonsense. DOM is not complicated because it
> contains anything superior - the reason (if any) is that it is formulated
> as language-agnostic as possible, with the unfortunate result it is rather
> clumsy to use in all languages.

Although I presume that people really mean the core standards when
they talk about "the DOM", not all the other ones related to those
core standards, the API is not to everyone's taste because, amongst
other things, it uses functions and methods when some people would
rather use properties (which actually appear in various places in the
standards, so it isn't as if the W3C haven't heard of such things),
and for lots of other subjective reasons: some I can agree with, some
I put at the same level as a lot of the API-posturing in numerous
domains where Python code gets written, where such code jostles above
all other concerns for the coveted "Pythonic" label.

However, when people are actually choosing to use DOM-related
technologies, and when those technologies do not necessarily have
equivalents in whatever other technology stack that could be
suggested, can we not just take it as read that they actually know
that the DOM isn't very nice (or that other people don't think that
it's very nice) and that there are alternatives to the core stuff
(especially when the inquirer has actually indicated his familiarity
with those alternatives) and that reminding everyone for the nth time
about how bad the DOM is (for whatever tangential purpose only
partially related to the topic under discussion) adds very little if
anything in the way of advice? It's like someone saying that they're
going to fly the Atlantic in a 747 only to be told that they should
drive a Lexus because "Boeing make terrible cars".

Feel free to replace "DOM" in the above with whatever else fits,
because this kind of thing comes up all the time.

Paul


From robert.kern at gmail.com  Tue May 19 18:16:46 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 19 May 2009 17:16:46 -0500
Subject: optparse options
In-Reply-To: <dd64aed2-ca3a-4f5e-8d22-d78aa52bb027@d38g2000prn.googlegroups.com>
References: <dd64aed2-ca3a-4f5e-8d22-d78aa52bb027@d38g2000prn.googlegroups.com>
Message-ID: <guvb4i$l8$1@ger.gmane.org>

On 2009-05-19 16:07, icarus wrote:
> Why do I need to put two options for this script to print the path?
>
> if I just specify the option and argument...
> $ python<script>.py -p xxxx
> Usage:<script>.py [-p dir] [--part=dir]
>
> <script>.py: error: No options specified
>
> So I need to give it two arguments...
> $ python<script>.py --part xxxx y
> xxxx

You have this piece of code:

	if len(args) != 1:
		parser.error("No options specified")

The args list contains all of the arguments after the options. Unlike sys.argv, 
it does not contain the executable's name in the first slot.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From dstanek at dstanek.com  Tue May 19 18:21:29 2009
From: dstanek at dstanek.com (David Stanek)
Date: Tue, 19 May 2009 18:21:29 -0400
Subject: Performance java vs. python
In-Reply-To: <guv968$2l5j$1@adenine.netfront.net>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.407.1242754952.8015.python-list@python.org>
	<guv968$2l5j$1@adenine.netfront.net>
Message-ID: <de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>

On Tue, May 19, 2009 at 5:43 PM, namekuseijin <namekuseijin at gmail.com> wrote:
> someone said:
>>>>>
>>>>> If you took a look at Java, you would
>>>>> notice that the core language syntax is much simpler than Python's.
>
> thanks for the laughs whoever you are!
>

I'm no Java fan, but I do agree that the core language is a bit easier
for people to grasp. I have also heard that from other developers as
well.

-- 
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek


From gunterhenriksen at gmail.com  Tue May 19 18:22:25 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Tue, 19 May 2009 15:22:25 -0700
Subject: Context manager, atexit processing, and PEP 3143 
	DaemonContext.close
In-Reply-To: <87fxf17b0m.fsf@benfinney.id.au>
References: <87bppsa6y8.fsf@benfinney.id.au>
	<d433b4bf-df08-4c9a-bcd0-ff2c058497fb@u9g2000pre.googlegroups.com>
	<87tz3k8lfc.fsf@benfinney.id.au>
	<70ec88d2-63ed-495b-b04a-9594bcbc23bd@n7g2000prc.googlegroups.com>
	<87hbzk8eoh.fsf@benfinney.id.au>
	<mailman.342.1242666875.8015.python-list@python.org>
	<87fxf17b0m.fsf@benfinney.id.au>
Message-ID: <ab4fa3490905191522w5063f25ex8d86a4a0d0303ad7@mail.gmail.com>

> > If there is a function which triggers a one-shot switch, I like
> > to have a way to find out if it has already been triggered, I
> > prefer to have the function tell me if it triggered the switch
> > or not, but I would not want that to be by raising an exception.
>
> In this case, though, we're talking about a class intended to
> implement the context manager API (in addition to other API).
>
> So, following your argument above, we might expect a generic
> context manager object to be able to tell us whether we're
> currently inside that context or not.  Does such a thing exist?

By a "one-shot switch" I meant as something which
changes once atomically in isolation, not as
something whose state comprises a transaction during
which the state of multiple externally visible
objects might change.

I imagine if there is an object used as a context
manager whose context state ("currently inside
that context or not") is not strictly under the
control of the single "with" statement where it is
fulfilling the "context manager" contract, would not
be a generic context manager.

In other words, to me it seems like the concept of
"currently inside a context or not" is not something
visible external to the object except in a case
where there is another thread of execution, which is
not a case I would expect to be part of the generic
context manager protocol, but can be added by an
object which implements the context manager protocol
and also keeps track of its state by setting flags
in the __enter__ and __exit__ functions.

Does this make sense?


From deets at nospam.web.de  Tue May 19 18:26:37 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 20 May 2009 00:26:37 +0200
Subject: Mock Form Post
In-Reply-To: <13e11ed4-8c40-4973-ab45-87e3e41bfb3b@m24g2000vbp.googlegroups.com>
References: <99c7e9d6-b1b2-4343-bbae-b01e0e640fb7@z5g2000vba.googlegroups.com>
	<13e11ed4-8c40-4973-ab45-87e3e41bfb3b@m24g2000vbp.googlegroups.com>
Message-ID: <77gq0tF1hhqbgU1@mid.uni-berlin.de>

Scooter schrieb:
> On May 19, 3:40 pm, Scooter <slbent... at gmail.com> wrote:
>> Let me qualify this by saying I'm very new to python. I'm doing some
>> work with mod_python and in a function I have defined I am passing in
>> the form and then iterating through the form keys. I'm currently
>> writing my unit tests and I'm trying to mock up a form object with
>> kids so I can emulate my true form post. So I'm attempting to mock up
>> a class that I'm calling "_Fakeform".  I'm lost on how I should do it
>> though. I thought by creating a dictionary object with key value pairs
>> that would satisfy my need but I'm not sure how to get at it when I
>> pass my mocked class in.
> 
> 1 strike against me for poor proof reading.
> 1) While I did mention mod_python I didn't say I was referring to an
> HTML form.
> 2) I said I'm trying to mock up a form object with "kids". No idea how
> I messed that up, but it should be "keys"

If you'd use mod_wsgi, you could create a WSGI-application that's easily 
testable with paste fixture, including filling out forms, following 
redirects and all that.

Diez


From david.lyon at preisshare.net  Tue May 19 18:46:15 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 19 May 2009 18:46:15 -0400
Subject: Package problem
In-Reply-To: <5b8d13220905190840u5cd76323y98c44f5dd724c7e@mail.gmail.com>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
	<5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
	<200905191329.48531.a.cavallo@cavallinux.eu>
	<5b8d13220905190840u5cd76323y98c44f5dd724c7e@mail.gmail.com>
Message-ID: <55093b941323dec2f138f34f3d605b1f@preisshare.net>

On Wed, 20 May 2009 00:40:28 +0900, David Cournapeau <cournape at gmail.com>
wrote:

> The discussion has nothing to do with setuptools, or even python for
> that matter. 

It has everything to do with python....

> on any system (including windows). That's why you should avoid
> installing from sources into the locations managed by the OS, be it
> /usr for unix, or C:\Windows on windows, etc...

I actually kind of agree with what you're saying here. Under Linux
it seems to me that users shouldn't be playing around in the
bowels of /usr/.... or anything lower...

but....

site-packages is the directory that one would want to keep
python packages in. That should be a developer/sysop area
and not owned and run by the o/s.

maybe... maybe... although too late now (?) somewhere
like /etc/site-packages might be a lot better place to
keep ones site packages. Or /opt.

Under windows in python 2.6, they have this concept of
user-packages.

One could easily also apply that concept to linux and
have a /home/user/.user-packages directory in which
one could keep all ones user packages.

> The problem is that overwriting files managed by the
> software management system without its consent is bound to be broken,

Something like what I describe above would totally
satisfy linux system organisation requirements.

David


From clp2 at rebertia.com  Tue May 19 18:48:40 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 19 May 2009 15:48:40 -0700
Subject: Performance java vs. python
In-Reply-To: <de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.407.1242754952.8015.python-list@python.org>
	<guv968$2l5j$1@adenine.netfront.net>
	<de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>
Message-ID: <50697b2c0905191548l32cd8485g4176e80641cef599@mail.gmail.com>

On Tue, May 19, 2009 at 3:21 PM, David Stanek <dstanek at dstanek.com> wrote:
> On Tue, May 19, 2009 at 5:43 PM, namekuseijin <namekuseijin at gmail.com> wrote:
>> someone said:
>>>>>>
>>>>>> If you took a look at Java, you would
>>>>>> notice that the core language syntax is much simpler than Python's.
>>
>> thanks for the laughs whoever you are!
>>
>
> I'm no Java fan, but I do agree that the core language is a bit easier
> for people to grasp. I have also heard that from other developers as
> well.

Perhaps for those with a C/C++ background, but I doubt that's true
generally speaking.

Cheers,
Chris
-- 
http://blog.rebertia.com


From gunterhenriksen at gmail.com  Tue May 19 18:56:38 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Tue, 19 May 2009 15:56:38 -0700
Subject: Performance java vs. python
In-Reply-To: <89dd3da60905191142k45e77ec0g9558be3aa1efa30b@mail.gmail.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<fbe2e2100905191042g59b7522ajd09353fc88dbcf2e@mail.gmail.com>
	<89dd3da60905191142k45e77ec0g9558be3aa1efa30b@mail.gmail.com>
Message-ID: <ab4fa3490905191556r67c19959je0e4d6e405a47478@mail.gmail.com>

My experience has been that if the execution stays
inside the VM, then for a "server side" application, the
JVM is faster, and proportionally even faster when there
are more threads ready to do something.

When the VM has to do a lot of interaction with the
OS, then I think it is difficult to make general
statements about Java vs Python, because there is so
much dependency on how a particular library interacts
with the operating system or with a remote server.
For example a database driver which is doing a lot
of conversion between the data representation of the
database and the native representation of the VM may
chew up more time than anything else, and for CPython
that driver may be doing all that stuff in a C library
where the Java version of the driver may be doing it all
in the JVM and taking an order of magnitude longer.

It seems to me like the guts of the JVM and CPython
VMs are pretty comparable in terms of performance, and
both languages are amenable to taking advantage of the
performance of the VM.

Other than the library implementations for interfacing
with the outside world, for me the major performance
distinction is with concurrency.  I tend to implement
solutions which rely pretty heavily on shared objects
and the java.util.concurrent facilities, and it seems
to me like the CPython VM is not able to easily provide
the level of simple clean shared object concurrency
support the JVM does.  And my experience with the Python
"multiprocessing" module is that while it is better than
nothing, it does not seem to facilitate nearly the level
of efficient shared object support the JVM does.


From phihag at phihag.de  Tue May 19 18:57:48 2009
From: phihag at phihag.de (Philipp Hagemeister)
Date: Wed, 20 May 2009 00:57:48 +0200
Subject: issue: Permissions in odfpy
In-Reply-To: <862e00220905182351k3ec16f8dnc7841d7e749ff743@mail.gmail.com>
References: <862e00220905182351k3ec16f8dnc7841d7e749ff743@mail.gmail.com>
Message-ID: <4A13396C.4060209@phihag.de>

Hi Shruti,

your message is kind of hard to read. Please note the following:

? Do not put useless junk("issue") in title.
? Multiple exclamation marks convey a sure sign of a diseased mind,
especially syntactically interesting constructions such as "??.."
? You didn't purchase your keyboard in August 2001, did you? (
http://ars.userfriendly.org/cartoons/?id=20010820 )
? It's probably just me, but "so please give me some solution" sounds
really rude. Why not "any ideas?", "thanks in advance" or just nothing?
Would you answer an email that ended like this? Please keep in mind, you
are not paying us, and we're trying to help you just because we want
happy python users (or trying to offset us being evil at times).
? Everyone mistpyes, and I'd be throwing mountains in my glass house if
I complained about grammar, but please show at least some effort.

That being said, this might help:

import odf.opendocument

doc = odf.opendocument.load('in.ods')
# You may want to use another way to select the sheet,
# this selects just the first one
sheet = doc.spreadsheet.childNodes[0]
sheet.setAttrNS(
    'urn:oasis:names:tc:opendocument:xmlns:table:1.0',
    'protected',
    'true')
doc.save('out.ods')

Regards,

Philipp

shruti surve wrote:
> hey,
> i am using odfpy and  generating spreadsheet in open office..but nobody
> should modify the file..so can anybody tell me how can we give permissions
> (read only) to spreadsheet in odfpy??..i have change the properties of my
> normal open office spreadsheet file and made it read only..n also
extracted
> it..but in conteny.xml also i am not finding any property which can be
used
> in odfpy...so please give me some solution..
>
>
> regards
> shruti surve
>

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From cjw at ncf.ca  Tue May 19 19:10:51 2009
From: cjw at ncf.ca (Colin J. Williams)
Date: Tue, 19 May 2009 19:10:51 -0400
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
In-Reply-To: <mff7e6-e43.ln1@satorlaser.homedns.org>
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
Message-ID: <guvea4$k8l$1@theodyn.ncf.ca>

Ulrich Eckhardt wrote:
> Steve Ferg wrote:
>> On the one hand, there are developers who love big IDEs with lots of
>> features (code generation, error checking, etc.), and rely on them to
>> provide the high level of support needed to be reasonably productive
>> in heavy-weight languages (e.g. Java).
>>
>> On the other hand there are developers who much prefer to keep things
>> light-weight and simple.  They like clean high-level languages (e.g.
>> Python) which are compact enough that you can keep the whole language
>> in your head, and require only a good text editor to be used
>> effectively.
> 
> This distinction is IMHO not correct. If you took a look at Java, you would
> notice that the core language syntax is much simpler than Python's. OTOH,
> if you add the standard libraries, you would soon see that Python's
> libraries are not as consistent (i.e. conformant to PEP8) as Java's.
> 
> What makes up for Python's perceived usability problems though is the
> commandline parser that allows you to inspect the type of an object and its
> parts of it at runtime, in particular the docstrings are a treasure there.
> 
> That said, an IDE that provides auto-completion (e.g. that gives you a list
> of available class members) is a good thing in Java, because you don't have
> to browse the documentation as often. With Python, that is impossible
> because there are no types bound to parameters, so any type that fits is
> allowed (duck typing).

I suggest that you look at PyScripter. 
It's helped if there is a doc string and 
if the parameters are spelled out i.e. 
not *args or **kwargs,

Colin W.
> 
> Uli
> 


From ben+python at benfinney.id.au  Tue May 19 19:21:01 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 20 May 2009 09:21:01 +1000
Subject: optparse options
References: <dd64aed2-ca3a-4f5e-8d22-d78aa52bb027@d38g2000prn.googlegroups.com>
Message-ID: <87bppo7k82.fsf@benfinney.id.au>

icarus <rsarpi at gmail.com> writes:

> 	parser = optparse.OptionParser(usage="%prog [-p dir] [--part=dir] ",
> version="%prog 1.0")
> 
> 	parser.add_option( "-p", "--part", dest="directory",
> 	                  help="process target directory", metavar="dir")
> 	(options, args) = parser.parse_args()

As documented in ?OptionParser.parse_args?, the return values are the
options parsed, and the *remaining* arguments after all the arguments
parsed as options.

So, the ?args? name will be bound to a list of only those arguments
which were not options. Very useful for programs which, in addition to
options, also take positional arguments where each argument position has
a specific meaning (e.g. ?input_file output_file?).

> 	if len(args) != 1:
> 		parser.error("No options specified")

The message is confusing, since it doesn't match the condition; it would
be correct to say ?Did not specify exactly one non-option argument?.

In this case, it looks like you don't want to check this at all, and
should instead operate on the basis of the options only.

-- 
 \          ?There's a certain part of the contented majority who love |
  `\            anybody who is worth a billion dollars.? ?John Kenneth |
_o__)                                            Galbraith, 1992-05-23 |
Ben Finney


From tjreedy at udel.edu  Tue May 19 19:21:52 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 19 May 2009 19:21:52 -0400
Subject: Is there a better way to chose a slice of a list?
In-Reply-To: <940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
Message-ID: <guveue$e1q$1@ger.gmane.org>

walterbyrd wrote:
> On May 8, 5:55 pm, John Yeung <gallium.arsen... at gmail.com> wrote:
>> On May 8, 3:03 pm,walterbyrd<walterb... at iname.com> wrote:
>>
>>> This works, but it seems like there should be a better way.
>>> --------------
>>> week = ['sun','mon','tue','wed','thu','fri','sat']
>>> for day in week[week.index('tue'):week.index('fri')]:
>>>    print day
>>> ---------------
>> I think you should provide much more information, primarily why you
>> want to do this.  What is the larger goal you are trying to achieve?
> 
> I am just looking for a less verbose, more elegant, way to print a
> slice of a list. 

week[2:5] # ;-)

If you want the interpreter to turn non-ints into ints for you, you will 
have to give it some sort of function or mapping to use.

dayint = {day:i for i,day in enumeratr(week)} # works in Py3 at least
week[dayint['tue']:dayint['fri']]

# or, untested, basing attrodic on memory of posted code

class attrodic(): #py3
   def __init__(self, dic):
     self.__dict__.update(dic)

di = attrodic(week)
week[di.tue:di.fri]

Most elegant, and most setup work ;-).

Terry Jan Reedy



From rhodri at wildebst.demon.co.uk  Tue May 19 19:22:12 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 20 May 2009 00:22:12 +0100
Subject: Is there a better way to chose a slice of a list?
In-Reply-To: <940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
Message-ID: <op.ut69vavja8ncjz@gnudebst>

On Tue, 19 May 2009 22:38:19 +0100, walterbyrd <walterbyrd at iname.com>  
wrote:

> On May 8, 5:55?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
>> On May 8, 3:03?pm,walterbyrd<walterb... at iname.com> wrote:
>>
>> > This works, but it seems like there should be a better way.
>>
>> > --------------
>> > week = ['sun','mon','tue','wed','thu','fri','sat']
>> > for day in week[week.index('tue'):week.index('fri')]:
>> > ? ?print day
>> > ---------------
>>
>> I think you should provide much more information, primarily why you
>> want to do this. ?What is the larger goal you are trying to achieve?
>
> I am just looking for a less verbose, more elegant, way to print a
> slice of a list. What is hard to understand about that? I am not sure
> how enumerated types help.

This is verbose and inelegant because of the way you're storing and
using the data, hence (I presume) John's question.  The more elegant
approach is not to try to index a list with strings, but to keep you
"day" data in numeric form and use that to slice with, and for that
enums will greatly help you keep things clear.  However, whether that's
worth doing or not depends on the bigger picture, and you haven't
told us anything that would help us figure that out.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From ben+python at benfinney.id.au  Tue May 19 19:29:42 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 20 May 2009 09:29:42 +1000
Subject: package with executable
References: <mailman.411.1242760431.8015.python-list@python.org>
Message-ID: <877i0c7jtl.fsf@benfinney.id.au>

Stefano Costa <steko at iosa.it> writes:

> my name is Stefano Costa, I am an archaeologist and I am developing
> GNUCal, a radiocarbon calibration program released under the GNU GPL.
> [1][2]

That is a great use of Python, and sounds like interesting work.

I would highly recommend you change the name, though.

Your project is not (I assume) developed under the auspice of the GNU
project, so it's misleading to call it ?GNU foobar? instead of just
?foobar?. There's no trademark involved, but it's still best to keep
the namespace clearly deliniated (which is also entirely in the Python
spirit :-)

Also, to call a program ?cal? risks great confusion among those who
know the standard ?cal? program as a calendar-generation utility. It's
best to avoid that confusion since it's entirely predictable.

Better would be something that evokes radiocarbon calibration; or, since
that's probably a pretty difficult job for a simple name, choose
something snappy that is at least evocative of the themes of
archaeology, radiocarbon dating, or measurement calibration.

Naming isn't an easy job, but it's an important one and is your only
chance at a first impression for the project.

-- 
 \           ?A thorough reading and understanding of the Bible is the |
  `\                           surest path to atheism.? ?Donald Morgan |
_o__)                                                                  |
Ben Finney
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From ben+python at benfinney.id.au  Tue May 19 19:31:54 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 20 May 2009 09:31:54 +1000
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
Message-ID: <873ab07jpx.fsf@benfinney.id.au>

walterbyrd <walterbyrd at iname.com> writes:

> On May 8, 5:55?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
> > On May 8, 3:03?pm,walterbyrd<walterb... at iname.com> wrote:
> > I think you should provide much more information, primarily why you
> > want to do this. ?What is the larger goal you are trying to achieve?
> 
> I am just looking for a less verbose, more elegant, way to print a
> slice of a list.

That's just the same micro-goal re-stated. What is your larger problem
of which this is a part? Perhaps a better approach can be suggested when
that context is known.

-- 
 \                 ?What's another word for Thesaurus?? ?Steven Wright |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From david.lyon at preisshare.net  Tue May 19 19:57:11 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Tue, 19 May 2009 19:57:11 -0400
Subject: Package problem
In-Reply-To: <200905191329.48531.a.cavallo@cavallinux.eu>
References: <65202bf1-8e84-475e-a193-b833bc50cb43@l32g2000vba.googlegroups.com>
	<46d018218eee7332fdf436ed42afdca3@preisshare.net>
	<5b8d13220905182345q201634c2ic41a6523cb36dd30@mail.gmail.com>
	<200905191329.48531.a.cavallo@cavallinux.eu>
Message-ID: <0747ee4ca3a90b1eda48eb579c21e4c1@preisshare.net>

On Tue, 19 May 2009 13:29:47 +0100, "A. Cavallo" <a.cavallo at cavallinux.eu>
wrote:
> You could try:
> 
> http://download.opensuse.org/repositories/home:/cavallo71:/python-opt/
> 
> This is a python interpreter installed under /opt/opt-python-2.7a0.
> All you have to do is sourcing /opt/opt-python-2.7a0/opt-python-env.sh
> from a shell and start using the python 2.7 (it's directly from the svn 
> trunk).
> 
> If you download a python module to generate the rpm for it all you have
to
> do 
> is:
> $> . /opt/opt-python-2.7a0/opt-python-env.sh
> $> python setup.py bdist_rpm 
> 
> It will generate a package rpm installable under /opt/python-2.7a0 and
> won't 
> interfere with the system.

I'm fascinated by this and want to try...

The above just gave me an ftp link?

Can you explain again how to do it?




From sjmachin at lexicon.net  Tue May 19 19:59:47 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 19 May 2009 16:59:47 -0700 (PDT)
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com> 
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
Message-ID: <46959810-1a29-4451-aa10-4b3d0eec36f7@b7g2000pre.googlegroups.com>

On May 20, 7:38?am, walterbyrd <walterb... at iname.com> wrote:
> On May 8, 5:55?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
>
> > On May 8, 3:03?pm,walterbyrd<walterb... at iname.com> wrote:
>
> > > This works, but it seems like there should be a better way.
>
> > > --------------
> > > ---------------
>
> > I think you should provide much more information, primarily why you
> > want to do this. ?What is the larger goal you are trying to achieve?
>
> I am just looking for a less verbose, more elegant, way to print a
> slice of a list. What is hard to understand about that?

Ummm two things, (1) You didn't say that was what you wanted (2) It's
a nonsense anyway:

Your original statement "choose a slice of alist": answer = alist
[lo:hi]

Your current statement "print a slice of a list" (one element per line
as per your example): can not be done much less verbosely and more
elegantly than:
    for x in alist[lo:hi]:
        print x

Your real problem appears to be the horrid method of deriving lo and
hi.

You gave ONE example without stating anything more precise than that
it was an example of a slice of a list [which was obvious anyway] and
didn't specify in what sense of "better" you wanted a better way. So
people have to guess what you really want.

Guessing that the 'tue' and 'fri' in your one example will always be
constants, here are two options:

E.g. given
week = ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat']

Option (1):
SUN, MON, TUE, WED, THU, FRI, SAT = range(7)
for day in week[TUE:FRI]:
    print day

Option (2):
for day in week[2:5]:
    print day

HTH,
John


From google at mrabarnett.plus.com  Tue May 19 20:07:39 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 20 May 2009 01:07:39 +0100
Subject: package with executable
In-Reply-To: <877i0c7jtl.fsf@benfinney.id.au>
References: <mailman.411.1242760431.8015.python-list@python.org>
	<877i0c7jtl.fsf@benfinney.id.au>
Message-ID: <4A1349CB.6090405@mrabarnett.plus.com>

Ben Finney wrote:
> Stefano Costa <steko at iosa.it> writes:
> 
>> my name is Stefano Costa, I am an archaeologist and I am developing
>> GNUCal, a radiocarbon calibration program released under the GNU GPL.
>> [1][2]
> 
> That is a great use of Python, and sounds like interesting work.
> 
> I would highly recommend you change the name, though.
> 
> Your project is not (I assume) developed under the auspice of the GNU
> project, so it's misleading to call it ?GNU foobar? instead of just
> ?foobar?. There's no trademark involved, but it's still best to keep
> the namespace clearly deliniated (which is also entirely in the Python
> spirit :-)
> 
> Also, to call a program ?cal? risks great confusion among those who
> know the standard ?cal? program as a calendar-generation utility. It's
> best to avoid that confusion since it's entirely predictable.
> 
> Better would be something that evokes radiocarbon calibration; or, since
> that's probably a pretty difficult job for a simple name, choose
> something snappy that is at least evocative of the themes of
> archaeology, radiocarbon dating, or measurement calibration.
> 
> Naming isn't an easy job, but it's an important one and is your only
> chance at a first impression for the project.
> 
The name that springs to my mind is "radcarbcal", but then that's just
me. :-)


From MLMLists at Comcast.net  Tue May 19 20:08:27 2009
From: MLMLists at Comcast.net (Mitchell L Model)
Date: Tue, 19 May 2009 20:08:27 -0400
Subject: sqlite3, qmarks, and NULL values
Message-ID: <p06240801c638f39624e9@[10.0.1.221]>

Suppose I have a simple query in sqlite3 in a function:

    def lookupxy(x, y):
        conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
                     (x, y))

However, COL2 might be NULL. I can't figure out a value for y that would retrieve rows for which COL2 is NULL. It seems to me that I have to perform an awkward test to determine whether to execute a query with one question mark or two.

    def lookupxy(x, y):
        if y:
            conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
                         (x, y))
        else:
            conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 IS NULL",
                         (x,))

The more question marks involved the more complicated this would get, especially if question marks in the middle of several would sometimes need to be NULL. I hope I'm missing something and that someone can tell me what it is.


From castironpi at gmail.com  Tue May 19 20:26:11 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 19 May 2009 17:26:11 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
Message-ID: <de2b10af-ff26-40ba-9588-d609386eaa57@q2g2000vbr.googlegroups.com>

On May 17, 7:05?am, jer... at martinfamily.freeserve.co.uk wrote:
> From a user point of view I think that adding a 'par' construct to
> Python for parallel loops would add a lot of power and simplicity,
> e.g.
>
> par i in list:
> ? ? updatePartition(i)
>
> There would be no locking and it would be the programmer's
> responsibility to ensure that the loop was truly parallel and correct.
>
> The intention of this would be to speed up Python execution on multi-
> core platforms. Within a few years we will see 100+ core processors as
> standard and we need to be ready for that.
>
> There could also be parallel versions of map, filter and reduce
> provided.
>
> BUT...none of this would be possible with the current implementation
> of Python with its Global Interpreter Lock, which effectively rules
> out true parallel processing.
>
> See:http://jessenoller.com/2009/02/01/python-threads-and-the-global-inter...
>
> What do others think?
>
> Jeremy Martin

Hi, joining late.

My first guess is that you haven't considered the existing syntactic
variants.

for i in list:
    fireandforget( updatePartition )( i )

for i in list:
    with fireandforget( ) as x:
        x.call( updatePartition )( i )

@fireandforget
def fun( i ):
    updatePartition( i )
for i in list:
    fun( i )

Are you suggesting only syntactic sugar, or a true semantic change to
make parallel programming easier?


From google at mrabarnett.plus.com  Tue May 19 20:54:08 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 20 May 2009 01:54:08 +0100
Subject: sqlite3, qmarks, and NULL values
In-Reply-To: <p06240801c638f39624e9@[10.0.1.221]>
References: <p06240801c638f39624e9@[10.0.1.221]>
Message-ID: <4A1354B0.6070300@mrabarnett.plus.com>

Mitchell L Model wrote:
> Suppose I have a simple query in sqlite3 in a function:
> 
>     def lookupxy(x, y):
>         conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
>                      (x, y))
> 
> However, COL2 might be NULL. I can't figure out a value for y that would retrieve rows for which COL2 is NULL. It seems to me that I have to perform an awkward test to determine whether to execute a query with one question mark or two.
> 
[snip]
Have you tried None, ie lookupxy(x, None)?


From sjmachin at lexicon.net  Tue May 19 21:37:27 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 19 May 2009 18:37:27 -0700 (PDT)
Subject: sqlite3, qmarks, and NULL values
References: <p06240801c638f39624e9@[10.0.1.221]>
	<mailman.425.1242780835.8015.python-list@python.org>
Message-ID: <94b67cc7-fac3-4e31-9106-4f209265e04b@g31g2000pra.googlegroups.com>

On May 20, 10:54?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> Mitchell L Model wrote:
> > Suppose I have a simple query in sqlite3 in a function:
>
> > ? ? def lookupxy(x, y):
> > ? ? ? ? conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
> > ? ? ? ? ? ? ? ? ? ? ?(x, y))
>
> > However, COL2 might be NULL. I can't figure out a value for y that would retrieve rows for which COL2 is NULL. It seems to me that I have to perform an awkward test to determine whether to execute a query with one question mark or two.
>
> [snip]
> Have you tried None, ie lookupxy(x, None)?

Have *you* tried that? Here's another armchair philosopher's take on
the expected outcome:

EITHER:

the wrapper blindly causes this to appear like "... COL2 = NULL",
which won't/shouldn't work. "expression = NULL" is neither true nor
false, it's unknown. The WHERE clause will/should return no rows at
all.

Example of unknowableness of nullity using relops:

sqlite> select case when 1 = null then 'A' else 'B' end;
B
sqlite> select case when 1 <> null then 'A' else 'B' end;
B
Note that "1 = null" is not true AND "1 <> null" is not true either.

OR:

The wrapper cunningly but unadvertisedly is causing that to appear
like "... COL2 IS NULL"

Cheers,
John


From steven at REMOVE.THIS.cybersource.com.au  Tue May 19 22:26:10 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 20 May 2009 02:26:10 GMT
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
Message-ID: <pan.2009.05.20.02.26.09@REMOVE.THIS.cybersource.com.au>

On Tue, 19 May 2009 14:38:19 -0700, walterbyrd wrote:

> On May 8, 5:55?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
>> On May 8, 3:03?pm,walterbyrd<walterb... at iname.com> wrote:
>>
>> > This works, but it seems like there should be a better way.
>>
>> > --------------
>> > week = ['sun','mon','tue','wed','thu','fri','sat'] for day in
>> > week[week.index('tue'):week.index('fri')]:
>> > ? ?print day
>> > ---------------
>>
>> I think you should provide much more information, primarily why you
>> want to do this. ?What is the larger goal you are trying to achieve?
> 
> I am just looking for a less verbose, more elegant, way to print a slice
> of a list. What is hard to understand about that? I am not sure how
> enumerated types help.

Printing a slice of a list is about as concise and elegant as possible:

print alist[slice_obj]

or

print alist[start:end:step]

But that's not what the example in your first post suggests. Your example 
suggests you have *two* problems:

(1) Given a slice, how to print each item in the slice _individually_.

The answer to that is 

for x in aslice:
    print x

Pretty concise and elegant.



(2) Given an arbitrary starting and ending _item_ rather than _position_, 
how to concisely and elegantly generate a slice.

There are many answers, depending on _why_ you want to do this. One 
possible answer is to write a function to do it:

def print_slice(alist, start_item, end_item):
    start_pos = alist.index(start_item)
    end_pos = alist.index(end_item)
    for x in alist[start_pos:end_pos]:
        print x

Now print_slice(week, 'tue', 'fri') is pretty concise and elegant.

Another answer is: Don't do that, do something else. If you have an 
enumerated type, then you could (in principle) do this:

week = enumerated('mon tue wed thu fri sat sun')
for x in week.tue-week.fri:
    print x


depending on the enumerated type itself naturally.



-- 
Steven


From wuwei23 at gmail.com  Tue May 19 22:41:56 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 19 May 2009 19:41:56 -0700 (PDT)
Subject: How can i use Spread Sheet as Data Store
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com> 
	<loom.20090518T151856-387@post.gmane.org>
	<8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com> 
	<20090519082013.65fba203.darcy@druid.net> <guudeo$f15$1@ger.gmane.org> 
	<mailman.389.1242741444.8015.python-list@python.org>
Message-ID: <3d924379-7bd8-4641-9470-c873947e1280@x1g2000prh.googlegroups.com>

On May 19, 11:57?pm, "D'Arcy J.M. Cain" <da... at druid.net> wrote:
> I hear you but I'm not so sure that that is an absolute. ?There are
> many applications that allow you to have your password emailed to you.
> For something with low risk that's perfectly acceptable.

Having -any- password stored in plaintext is unacceptable. I'm pretty
sure I'm not the only person who uses a simple algorithm to generate
passwords based on context. If you're running a site and you're not
going to bother to secure my credentials, I'd hope you'd at least
mention that at sign up so I could adjust my behaviour as appropriate.


From steven at REMOVE.THIS.cybersource.com.au  Tue May 19 22:43:26 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 20 May 2009 02:43:26 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
Message-ID: <pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>

On Tue, 19 May 2009 03:57:43 -0700, jeremy wrote:

>> you want it so simple to use that amateurs can mechanically replace
>> 'for' with 'par' in their code and everything will Just Work, no effort
>> or thought required.
> 
> Yes I do want the par construction to be simple, but of course you can't
> just replace a for loop with a par loop in the general case.

But that's exactly what you said you wanted people to be able to do:

"with my suggestion they could potentially get a massive speed up just by 
changing 'for' to 'par' or 'map' to 'pmap'."

I am finding this conversation difficult because it seems to me you don't 
have a consistent set of requirements.



> This issue
> arises when people use OpenMP: you can take a correct piece of code, add
> a comment to indicate that a loop is 'parallel', and if you get it wrong
> the code with no longer work correctly. 

How will 'par' be any different? It won't magically turn code with 
deadlocks into bug-free code.


> With my 'par' construct the
> programmer's intention is made explicit in the code, rather than by a
> compiler directive and so I think that is clearer than OpenMP.

A compiler directive is just as clear about the programmer's intention as 
a keyword. Possibly even more so.

#$ PARALLEL-LOOP
for x in seq:
    do(x)

Seems pretty obvious to me. (Not that I'm suggesting compiler directives 
is a good solution to this problem.)


> As I wrote before, concurrency is one of the hardest things for
> professional programmers to grasp. For 'amateur' programmers we need to
> make it as simple as possible, 

The problem is that "as simple as possible" is Not Very Simple. There's 
no getting around the fact that concurrency is inherently complex. In 
some special cases, you can keep it simple, e.g. parallel-map with a 
function that has no side-effects. But in the general case, no, you can't 
avoid dealing with the complexity, at least a little bit.


> and I think that a parallel loop
> construction and the dangers that lurk within would be reasonably
> straightforward to explain: there are no locks to worry about, no
> message passing.

It's *already* easy to explain. And having explained it, you still need 
to do something about it. You can't just say "Oh well, I've had all the 
pitfalls explained to me, so now I don't have to actually do anything 
about avoiding those pitfalls". You still need to actually avoid them. 
For example, you can choose one of four tactics:

(1) the loop construct deals with locking;

(2) the caller deals with locking;

(3) nobody deals with locking, therefore the code is buggy and risks 
deadlocks; or

(4) the caller is responsible for making sure he never shares data while 
looping over it.

I don't think I've missed any possibilities. You have to pick one of 
those four. 


> The only advanced concept is the 'sync' keyword, which
> would be used to rendezvous all the threads. That would only be used to
> speed up certain codes in order to avoid having to repeatedly shut down
> and start up gangs of threads.

So now you want a second keyword as well.



-- 
Steven


From wuwei23 at gmail.com  Tue May 19 22:54:24 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 19 May 2009 19:54:24 -0700 (PDT)
Subject: strip char from list of strings
References: <195055.64779.qm@web54204.mail.re2.yahoo.com>
	<mailman.372.1242718327.8015.python-list@python.org> 
	<guuh5b$1s4$1@services.telesweet.net>
Message-ID: <a4e36445-4cd8-42e5-917b-b3881b01a457@g31g2000pra.googlegroups.com>

On May 20, 12:55?am, Laurent Luce <laurentluc... at yahoo.com> wrote:
> I had a simple loop stripping each string but I was looking for
> something concise and efficient. I like the following answer:
> x = [s.rstrip('\n') for s in x]

Your initial requirement stated that you needed this to happen in-
place. What you're doing here is creating a completely new list and
then assigning it to x. While this is most likely what you want, note
that this will not update any other reference to that list:

>>> x = ['test\n', 'test2\n', 'test3\n']
>>> y = x
>>> x = [s.rstrip() for s in x]
>>> x
['test', 'test2', 'test3']
>>> y
['test\n', 'test2\n', 'test3\n']

To perform the same operation in-place, you can use the slice operator
to assign to the list object rather than to the label:

>>> x = ['test\n', 'test2\n', 'test3\n']
>>> y = x
>>> x[:] = [s.rstrip() for s in x] # note the slice operator
>>> x
['test', 'test2', 'test3']
>>> y
['test', 'test2', 'test3']

The latter example is especially important if you have more than one
reference to the list you're modifying and wish them all to have the
updated value.


From steven at REMOVE.THIS.cybersource.com.au  Tue May 19 23:29:22 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 20 May 2009 03:29:22 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
	<bemdncWkNYTJEo_XnZ2dnUVZ_gZi4p2d@posted.usinternet>
Message-ID: <pan.2009.05.20.03.29.22@REMOVE.THIS.cybersource.com.au>

On Tue, 19 May 2009 05:52:04 -0500, Grant Edwards wrote:

> On 2009-05-19, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>
> wrote:
>> On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:
>>
>>> Let me clarify what I think par, pmap, pfilter and preduce would mean
>>> and how they would be implemented.
>> [...]
>>
>> Just for fun, I've implemented a parallel-map function, and done a
>> couple of tests. Comments, criticism and improvements welcome!
> 
> My only comment would be that your "slow function" might not be a very
> simulation for the general-case, since it uses time.sleep() which
> releases the GIL:


I didn't expect my code to magically overcome fundamental limitations of 
the CPython interpreter :)



>> def f(arg):  # Simulate a slow function.
>>     time.sleep(0.5)
>>     return 3*arg-2
> 
> Any Python function that isn't calling a library function written in C
> that releases the GIL won't show any speedup will it?

Not necessarily. Here's another function, that uses a loop instead of 
sleep.

def g(arg, SIZE=8*10**6):
    # Default SIZE is chosen so that on my machine, the loop 
    # takes approximately 0.5 second.
    for x in xrange(SIZE):
        pass
    return 3*arg-2


>>> setup = 'from __main__ import pmap, g; data = range(50)'
>>> min(Timer('map(g, data)', setup).repeat(repeat=5, number=3))
65.093590974807739
>>> min(Timer('pmap(g, data)', setup).repeat(repeat=5, number=3))
20.268381118774414


However, if the function is fast enough that the GIL doesn't get a chance 
to be released often enough, then pmap() is a pessimation:

>>> def g(arg):
...     return 3*arg+2
...
>>> min(Timer('map(g, data)', setup).repeat(repeat=5, number=3))
0.00012803077697753906
>>> min(Timer('pmap(g, data)', setup).repeat(repeat=5, number=3))
19.960626125335693

Concurrency doesn't come for free. There are setup and teardown costs, 
and management costs. Presumably if pmap() was written more cleverly, in 
C, those costs could be reduced, but not eliminated.



> I don't have a
> multi-core machine to try it on, but what happens when you replace your
> "slow function" code with something that actually burns CPU using
> pure-Python code instead of blocking on a timer in the OS?

Two simple work-arounds are:

* use Jython or IronPython; or

* insert time.sleep(0.000001) into your function at various points.


-- 
Steven


From darwin at nowhere.com  Tue May 19 23:55:34 2009
From: darwin at nowhere.com (Paul Hemans)
Date: Wed, 20 May 2009 13:55:34 +1000
Subject: distutils and building an distribution that includes other packages
Message-ID: <guvuvn$31bb$1@news.ett.com.ua>

Hi,
I am new to Python, and after a lot of sweat and tears, I have my first app. 
Now I need to deploy it to end-users. The application includes the use of 
lxml and sqlAlchemy so I need those to install automatically as part of the 
installation process. I really don't want the users having to download 
various modules and install them. Is this facility (to download and install 
other packages seamlessly) part of distutils? If so, I have been looking 
around for a simple tutorial on the topic but haven't found anything yet. 
Can anyone point me to some information?

Thanks 




From clp2 at rebertia.com  Wed May 20 00:16:29 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 19 May 2009 21:16:29 -0700
Subject: distutils and building an distribution that includes other 
	packages
In-Reply-To: <guvuvn$31bb$1@news.ett.com.ua>
References: <guvuvn$31bb$1@news.ett.com.ua>
Message-ID: <50697b2c0905192116j3dfd7187t893351b60fd37232@mail.gmail.com>

On Tue, May 19, 2009 at 8:55 PM, Paul Hemans <darwin at nowhere.com> wrote:
> Hi,
> I am new to Python, and after a lot of sweat and tears, I have my first app.
> Now I need to deploy it to end-users. The application includes the use of
> lxml and sqlAlchemy so I need those to install automatically as part of the
> installation process. I really don't want the users having to download
> various modules and install them. Is this facility (to download and install
> other packages seamlessly) part of distutils? If so, I have been looking
> around for a simple tutorial on the topic but haven't found anything yet.
> Can anyone point me to some information?

Since I'm guessing your platform is Windows, you'll probably be
interested in py2exe - http://www.py2exe.org/

Cheers,
Chris
-- 
http://blog.rebertia.com


From http  Wed May 20 00:20:03 2009
From: http (Paul Rubin)
Date: 19 May 2009 21:20:03 -0700
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
Message-ID: <7x7i0cmmmk.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
> (4) the caller is responsible for making sure he never shares data while 
> looping over it.
> 
> I don't think I've missed any possibilities. You have to pick one of 
> those four. 

I wonder if the compiler can check that a given function doesn't
change any data.  Then:

@pure
def f(x):
   return x*sqrt(x) + 3      # does not mutate any data

@pure
def g(x): ...                # likewise

s = parallel_dot_product(parallel_map(f, vec), parallel_map(g,vec))



From darwin at nowhere.com  Wed May 20 00:31:48 2009
From: darwin at nowhere.com (Paul Hemans)
Date: Wed, 20 May 2009 14:31:48 +1000
Subject: distutils and building an distribution that includes other
	packages
References: <guvuvn$31bb$1@news.ett.com.ua>
	<mailman.426.1242792992.8015.python-list@python.org>
Message-ID: <gv013l$kv$1@news.ett.com.ua>

Hi Chris,
Yes I do intend to use py2exe for windows installation but I don't 
understand how it will help me distribute lxml and sqlAlchemy as part of the 
install, or am I missing something?

"Chris Rebert" <clp2 at rebertia.com> wrote in message 
news:mailman.426.1242792992.8015.python-list at python.org...
> On Tue, May 19, 2009 at 8:55 PM, Paul Hemans <darwin at nowhere.com> wrote:
>> Hi,
>> I am new to Python, and after a lot of sweat and tears, I have my first 
>> app.
>> Now I need to deploy it to end-users. The application includes the use of
>> lxml and sqlAlchemy so I need those to install automatically as part of 
>> the
>> installation process. I really don't want the users having to download
>> various modules and install them. Is this facility (to download and 
>> install
>> other packages seamlessly) part of distutils? If so, I have been looking
>> around for a simple tutorial on the topic but haven't found anything yet.
>> Can anyone point me to some information?
>
> Since I'm guessing your platform is Windows, you'll probably be
> interested in py2exe - http://www.py2exe.org/
>
> Cheers,
> Chris
> -- 
> http://blog.rebertia.com 




From castironpi at gmail.com  Wed May 20 00:41:08 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 19 May 2009 21:41:08 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
	<7x7i0cmmmk.fsf@ruckus.brouhaha.com>
Message-ID: <7f80a17e-1081-46ee-8581-109ca62bdfb7@z5g2000vba.googlegroups.com>

On May 19, 11:20?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> Steven D'Aprano <ste... at REMOVE.THIS.cybersource.com.au> writes:
> > (4) the caller is responsible for making sure he never shares data while
> > looping over it.
>
> > I don't think I've missed any possibilities. You have to pick one of
> > those four.
>
> I wonder if the compiler can check that a given function doesn't
> change any data. ?Then:
>
> @pure
> def f(x):
> ? ?return x*sqrt(x) + 3 ? ? ?# does not mutate any data
>
> @pure
> def g(x): ... ? ? ? ? ? ? ? ?# likewise
>
> s = parallel_dot_product(parallel_map(f, vec), parallel_map(g,vec))

You can do the basics of this using the 'ast' module.  Just check that
no nodes in the ast tree are Assign nodes, including augmented
assign.  Then 'f' is defined as:

f= pure( '''
   return x*sqrt(x) + 3      # does not mutate any data
''' )

Untested.  However, you do need to check that the subchildren don't
make mutations.  This adds hooks to the AST, since names can change at
run-time.  Also, it's only defined for functions that call functions
that are all pure Python and defined using 'pure' as well, without
inspecting the bytecode.  At this point one might look into
metaprogramming and script autogeneration.

The 'pure' wrapper doesn't fundamentally change the semantics of the
function; it is more like a pre- and post-condition check.


From clp2 at rebertia.com  Wed May 20 01:01:34 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 19 May 2009 22:01:34 -0700
Subject: distutils and building an distribution that includes other 
	packages
In-Reply-To: <gv013l$kv$1@news.ett.com.ua>
References: <guvuvn$31bb$1@news.ett.com.ua>
	<mailman.426.1242792992.8015.python-list@python.org>
	<gv013l$kv$1@news.ett.com.ua>
Message-ID: <50697b2c0905192201p75af148crfc187702bc9739f5@mail.gmail.com>

> "Chris Rebert" <clp2 at rebertia.com> wrote in message
> news:mailman.426.1242792992.8015.python-list at python.org...
>> On Tue, May 19, 2009 at 8:55 PM, Paul Hemans <darwin at nowhere.com> wrote:
>>> Hi,
>>> I am new to Python, and after a lot of sweat and tears, I have my first
>>> app.
>>> Now I need to deploy it to end-users. The application includes the use of
>>> lxml and sqlAlchemy so I need those to install automatically as part of
>>> the
>>> installation process. I really don't want the users having to download
>>> various modules and install them. Is this facility (to download and
>>> install
>>> other packages seamlessly) part of distutils? If so, I have been looking
>>> around for a simple tutorial on the topic but haven't found anything yet.
>>> Can anyone point me to some information?
>>
>> Since I'm guessing your platform is Windows, you'll probably be
>> interested in py2exe - http://www.py2exe.org/
>>
>> Cheers,
>> Chris
On Tue, May 19, 2009 at 9:31 PM, Paul Hemans <darwin at nowhere.com> wrote:
> Hi Chris,
> Yes I do intend to use py2exe for windows installation but I don't
> understand how it will help me distribute lxml and sqlAlchemy as part of the
> install, or am I missing something?

Granted I haven't used Windows (and thus py2exe) in a while, but last
I recall the executable it produced was a self-contained Python
executable containing the main script and all its necessary
modules/libraries. I think there were some issues getting it to
include certain finnicky third-party libraries, but once tweaked
properly it could be coaxed to include them.

Thus, you don't need to install/distribute the libraries at all;
they'll be included as part of the generated executable. Then to
distribute/install your program, you just copy the executable (and
maybe a DLL or two, again it's been a while).

Cheers,
Chris
-- 
http://blog.rebertia.com


From rozzin at geekspace.com  Wed May 20 01:22:43 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Wed, 20 May 2009 01:22:43 -0400
Subject: Seeking old post on developers who like IDEs vs developers who
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
Message-ID: <87vdnwjql8.fsf@slice.rozzin.com>

Ulrich Eckhardt <eckhardt at satorlaser.com> writes:
> 
> That said, an IDE that provides auto-completion (e.g. that gives you a list
> of available class members) is a good thing in Java, because you don't have
> to browse the documentation as often.

While I find at least some types of autocompletion to be laudable
features, your rationale (if I'm reading it right)..., frankly,
frightens me.

You may find these interesting reading, if you haven't encountered
them previously:

    http://www.cincomsmalltalk.com/userblogs/buck/blogView?showComments=true&entry=3296933922

    http://www.charlespetzold.com/etc/DoesVisualStudioRotTheMind.html

Steve may find them intersting, also--I don't think that either of
them is the particular post for which he's searching, but they both
are quite related to it.

Actually: thank you, Steve, for indirectly reminding me of
`Does Visual Studio Rot the Mind'--I'd forgotten all about it.

> With Python, that is impossible because there are no types bound to
> parameters, so any type that fits is allowed (duck typing).

That does not prevent a tool from showing you the argument-list;
untyped as it is, the number, sequence, and *names* of the arguments
*are* available. And it could be argued (especially with Python's duck
typing) that the parameters' *names* are (or at least *should be*) far
more illustrative of their purpose than their type-specifications
would be.

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From neild at misago.org  Wed May 20 01:35:28 2009
From: neild at misago.org (Damien Neil)
Date: Tue, 19 May 2009 22:35:28 -0700
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
	<4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>
	<3b84542c-7746-498d-8d9e-977deaecfc1d@r3g2000vbp.googlegroups.com>
	<77g46cF1h8ffnU1@mid.uni-berlin.de>
Message-ID: <neild-C119D2.22352819052009@news.individual.net>

 "Diez B. Roggisch" <deets at nospam.web.de> wrote:
> APIs such as ElementTree don't try to burden themselves with the
> language-agnosticism, and thus are much more powerful.

Having used both ElementTree and xml.dom, I don't see that ET is any 
more powerful.  Both APIs let you manipulate an XML tree in pretty much 
any way possible.  (The ET bundled with Python is rather less powerful, 
since it lacks support for processing instructions and other XML 
features, but lxml corrects that.)

Personally, I find ElementTree's handling of text nodes to be very 
clumsy compared to that in the DOM.  For me, DOM with XPath is much 
nicer than ET.  Tastes differ, of course.

                        - Damien


From kalyanchakravarthy at hyit.com  Wed May 20 01:52:59 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Wed, 20 May 2009 11:22:59 +0530
Subject: How to get Form values in Python code and Send Email
Message-ID: <8ca278430905192252g67008d31qcd1da318674e30e1@mail.gmail.com>

Hi All,

    I have one doubt, I have feedback form (HTML Page) in one website user
enters all the details and after submitting the page, in back end Python
class i want to get all those data and send to one email id.

for this please any one can guide me how to do it in  Python( how to get
HTML form data in Python and send those data as an Email) and Google Apps

Thanks in advance

-- 
Regards
Kalyan
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From steven at REMOVE.THIS.cybersource.com.au  Wed May 20 01:57:38 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 20 May 2009 05:57:38 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
	<7x7i0cmmmk.fsf@ruckus.brouhaha.com>
	<7f80a17e-1081-46ee-8581-109ca62bdfb7@z5g2000vba.googlegroups.com>
Message-ID: <pan.2009.05.20.05.57.39@REMOVE.THIS.cybersource.com.au>

On Tue, 19 May 2009 21:41:08 -0700, Aaron Brady wrote:

> On May 19, 11:20?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>> Steven D'Aprano <ste... at REMOVE.THIS.cybersource.com.au> writes:
>> > (4) the caller is responsible for making sure he never shares data
>> > while looping over it.
>>
>> > I don't think I've missed any possibilities. You have to pick one of
>> > those four.
>>
>> I wonder if the compiler can check that a given function doesn't change
>> any data. ?Then:
>>
>> @pure
>> def f(x):
>> ? ?return x*sqrt(x) + 3 ? ? ?# does not mutate any data
>>
>> @pure
>> def g(x): ... ? ? ? ? ? ? ? ?# likewise
>>
>> s = parallel_dot_product(parallel_map(f, vec), parallel_map(g,vec))
> 
> You can do the basics of this using the 'ast' module.  Just check that
> no nodes in the ast tree are Assign nodes, including augmented assign. 
> Then 'f' is defined as:
> 
> f= pure( '''
>    return x*sqrt(x) + 3      # does not mutate any data
> ''' )
> 
> Untested.  


Can you explain how you can tell that there are no side-effects from 
x*sqrt(x)+3 ? What if I have this?

class Funny(object):
    def __add__(self, other):
        global parrot
        parrot += 1
        return 5 + other

x = Funny()




-- 
Steven


From a.cavallo at cavallinux.eu  Wed May 20 02:01:39 2009
From: a.cavallo at cavallinux.eu (A. Cavallo)
Date: Wed, 20 May 2009 07:01:39 +0100
Subject: package with executable
In-Reply-To: <1242759252.4438.114.camel@gibreel>
References: <1242759252.4438.114.camel@gibreel>
Message-ID: <200905200701.39370.a.cavallo@cavallinux.eu>

Hi,

> Matplotlib and Numpy, and a command line program. My goal is to create a
> distributable package, that should ideally contain both the "gnucal"
> package and the command line program.
>       * where should the executable module be wrt setup.py and/or the
>         package directory in the source tree
>       * how should I format the console_scripts entry in setup() to make
>         the executable module available to the system PATH after
>         installing

With the standard distutils (no need for setuptools) the config.py file might 
look like:


===== setup.py =====
from distutils.core import setup

version = '0.1'


setup(name='gnucal',
      version=version,
      description="GNUCal is a radiocarbon (14C) calibration program",
      long_description="""\
""",
      author='Stefano Costa',
      author_email='steko at iosa.it',
      url='http://gnucal.iosa.it/',
      license='GNU GPLv3',
      packages=['gnucal',],
      scripts=['gnucal.py',]
      )

>       * how should I call the "gnucal" package from inside the
>         executable script (currently I'm using "from gnucal import core"
>         but it doesn't seem to work)

import gnucal must work. If you're developing from the sources (eg. without 
having the package installed) you need to be in the same dir where the 
gnucal.py is or you need to set PYTHONPATH in order to find the directory 
gnucal (the one containing __init__.py).


> I'm using virtualenv to create testing environments for the install
> process, and my Python is 2.5.4 on Debian Sid.
>
> Any suggestion is appreciated, particularly if there are some real
> examples to draw from.

At line 101 the statement sys.exit("Please.. should be parser.error("Please..

Regards,
Antonio


From paul.hemans at gmail.com  Wed May 20 02:19:43 2009
From: paul.hemans at gmail.com (Paul Hemans)
Date: Tue, 19 May 2009 23:19:43 -0700 (PDT)
Subject: distutils and building an distribution that includes other 
	packages
References: <guvuvn$31bb$1@news.ett.com.ua>
	<mailman.426.1242792992.8015.python-list@python.org> 
	<gv013l$kv$1@news.ett.com.ua>
	<mailman.427.1242795696.8015.python-list@python.org>
Message-ID: <369167d3-f002-43d2-a838-477f0551e2d8@j18g2000prm.googlegroups.com>

On May 20, 3:01?pm, Chris Rebert <c... at rebertia.com> wrote:
> > "Chris Rebert" <c... at rebertia.com> wrote in message
> >news:mailman.426.1242792992.8015.python-list at python.org...
> >> On Tue, May 19, 2009 at 8:55 PM, Paul Hemans <dar... at nowhere.com> wrote:
> >>> Hi,
> >>> I am new to Python, and after a lot of sweat and tears, I have my first
> >>> app.
> >>> Now I need to deploy it to end-users. The application includes the use of
> >>> lxml and sqlAlchemy so I need those to install automatically as part of
> >>> the
> >>> installation process. I really don't want the users having to download
> >>> various modules and install them. Is this facility (to download and
> >>> install
> >>> other packages seamlessly) part of distutils? If so, I have been looking
> >>> around for a simple tutorial on the topic but haven't found anything yet.
> >>> Can anyone point me to some information?
>
> >> Since I'm guessing your platform is Windows, you'll probably be
> >> interested in py2exe -http://www.py2exe.org/
>
> >> Cheers,
> >> Chris
> On Tue, May 19, 2009 at 9:31 PM, Paul Hemans <dar... at nowhere.com> wrote:
> > Hi Chris,
> > Yes I do intend to use py2exe for windows installation but I don't
> > understand how it will help me distribute lxml and sqlAlchemy as part of the
> > install, or am I missing something?
>
> Granted I haven't used Windows (and thus py2exe) in a while, but last
> I recall the executable it produced was a self-contained Python
> executable containing the main script and all its necessary
> modules/libraries. I think there were some issues getting it to
> include certain finnicky third-party libraries, but once tweaked
> properly it could be coaxed to include them.
>
> Thus, you don't need to install/distribute the libraries at all;
> they'll be included as part of the generated executable. Then to
> distribute/install your program, you just copy the executable (and
> maybe a DLL or two, again it's been a while).
>
> Cheers,
> Chris
> --http://blog.rebertia.com- Hide quoted text -
>
> - Show quoted text -

Ah, I was overcomplicating things (again).
Thanks


From timr at probo.com  Wed May 20 02:34:37 2009
From: timr at probo.com (Tim Roberts)
Date: Tue, 19 May 2009 23:34:37 -0700
Subject: Python mail truncate problem
References: <4db625fe-158d-4b04-af0b-23e54c3ae22b@e23g2000vbe.googlegroups.com>
Message-ID: <i38715tu7uf82c8l1csul3sq6lsp2pk165@4ax.com>

David <Wwy58 at yahoo.com> wrote:
>
>I am writing Python script to process e-mails in a user's mail
>account. What I want to do is to update that e-mail's Status to 'R'
>after processing it, however, the following script truncates old e-
>mails even though it updates that e-mail's Status correctly. Anybody
>knows how to fix this?

Truncates in what way?  When I tried this, it seemed to work fine.

Note, however, that it is somewhat dangerous to modify an iterator while
you are using it.  (That is, you are setting mbox[key] while doing
mbox.iteritems.)  I might suggest you grab the keys as a list and iterate
through them:

   for key in mbox.keys():
       msg = mbox[key]
       ...
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From ldo at geek-central.gen.new_zealand  Wed May 20 02:46:01 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 20 May 2009 18:46:01 +1200
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<gutcdg$3st$4@lust.ihug.co.nz>
	<ac63e27e-2dd9-4c27-ace0-d9e205be7afa@s31g2000vbp.googlegroups.com>
	<gutoh2$b0a$1@lust.ihug.co.nz>
	<5f7f9840-0e17-48fb-acf9-04186fb1b7ab@r3g2000vbp.googlegroups.com>
Message-ID: <gv08v9$pgg$1@lust.ihug.co.nz>

In message <5f7f9840-0e17-48fb-acf9-04186fb1b7ab at r3g2000vbp.googlegroups.com>, Jack Trades wrote:

> On May 19, 3:53 am, Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
>
>> Possibly your CGI scripts are running as some user like "nobody", which
>> doesn't have the right access to the files/directories. Changing APIs
>> won't help here.
> 
> If that is the case, would setuid be appropriate here?

You mean suexec? Certainly, yes.



From ldo at geek-central.gen.new_zealand  Wed May 20 02:47:17 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 20 May 2009 18:47:17 +1200
Subject: Subversion commit from Python?
References: <2904e7de-0a8d-4697-9c44-c83bb5319de4@s31g2000vbp.googlegroups.com>
	<gutcdg$3st$4@lust.ihug.co.nz>
	<ac63e27e-2dd9-4c27-ace0-d9e205be7afa@s31g2000vbp.googlegroups.com>
	<gutoh2$b0a$1@lust.ihug.co.nz>
	<5f7f9840-0e17-48fb-acf9-04186fb1b7ab@r3g2000vbp.googlegroups.com>
	<77fv7jF1h44coU1@mid.uni-berlin.de>
Message-ID: <gv091m$pgg$2@lust.ihug.co.nz>

In message <77fv7jF1h44coU1 at mid.uni-berlin.de>, Diez B. Roggisch wrote:

> I have had many troubles with SVN + permissions.

I create a custom captive user to own write access to the repository, with 
access only to keys belonging to authorized users via svn+ssh. Problem 
solved.



From __peter__ at web.de  Wed May 20 03:08:27 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 20 May 2009 09:08:27 +0200
Subject: sqlite3, qmarks, and NULL values
References: <mailman.424.1242778866.8015.python-list@python.org>
Message-ID: <gv0a91$stk$02$1@news.t-online.com>

Mitchell L Model wrote:

> Suppose I have a simple query in sqlite3 in a function:
> 
>     def lookupxy(x, y):
>         conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
>                      (x, y))
> 
> However, COL2 might be NULL. I can't figure out a value for y that would
> retrieve rows for which COL2 is NULL. It seems to me that I have to
> perform an awkward test to determine whether to execute a query with one
> question mark or two.
> 
>     def lookupxy(x, y):
>         if y:
>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 =
>             ?",
>                          (x, y))
>         else:
>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 IS
>             NULL",
>                          (x,))
> 
> The more question marks involved the more complicated this would get,
> especially if question marks in the middle of several would sometimes need
> to be NULL. I hope I'm missing something and that someone can tell me what
> it is.

You could create a custom function

def equals(a, b):
    return a == b

conn.create_function("equals", 2, equals)

cursor.execute("select * from table where equals(col1, ?) and ...", (x,...))

Or you do some gymnastics in Python:

class Expr(object):
    def __init__(self, dict):
        self.dict = dict
    def __getitem__(self, key):
        value = self.dict[key]
        if value is None:
            return "(%s is null)" % key
        return "(%s = :%s)" % (key, key)

def lookup(col1, col2):
    lookup = locals()
    sql = "SELECT * FROM table WHERE %(col1)s AND %(col2)s" % Expr(lookup)
    return conn.execute(sql, lookup)

I think these are both more readable than

"... where case when :col1 is null then (col1 is null) else (col1 = :col1) end ..."

Peter





From kalyanchakravarthy at hyit.com  Wed May 20 03:31:28 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Wed, 20 May 2009 13:01:28 +0530
Subject: How can i use Spread Sheet as Data Store
In-Reply-To: <3d924379-7bd8-4641-9470-c873947e1280@x1g2000prh.googlegroups.com>
References: <8ca278430905180401h396ab2b8r89423b047747ce6d@mail.gmail.com>
	<loom.20090518T151856-387@post.gmane.org>
	<8ca278430905182221i2e967bbesa7d7fde6dba7a28b@mail.gmail.com>
	<20090519082013.65fba203.darcy@druid.net> <guudeo$f15$1@ger.gmane.org>
	<mailman.389.1242741444.8015.python-list@python.org>
	<3d924379-7bd8-4641-9470-c873947e1280@x1g2000prh.googlegroups.com>
Message-ID: <8ca278430905200031x41896081p3c45fbfe37a73743@mail.gmail.com>

Thanks Alex
                   Then tell me how can I solve this issue.

Thanks in advance

Regards
Kalyan

On Wed, May 20, 2009 at 8:11 AM, alex23 <wuwei23 at gmail.com> wrote:

> On May 19, 11:57 pm, "D'Arcy J.M. Cain" <da... at druid.net> wrote:
> > I hear you but I'm not so sure that that is an absolute.  There are
> > many applications that allow you to have your password emailed to you.
> > For something with low risk that's perfectly acceptable.
>
> Having -any- password stored in plaintext is unacceptable. I'm pretty
> sure I'm not the only person who uses a simple algorithm to generate
> passwords based on context. If you're running a site and you're not
> going to bother to secure my credentials, I'd hope you'd at least
> mention that at sign up so I could adjust my behaviour as appropriate.
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Regards
Kalyan
Mobile no: +91 9985351220
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From aotto1968 at t-online.de  Wed May 20 03:53:03 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Wed, 20 May 2009 09:53:03 +0200
Subject: PYTHONPATH on Windows XP module load problem
References: <guubg7$nnk$03$1@news.t-online.com>
Message-ID: <gv0csv$29p$02$1@news.t-online.com>

Hi,

  I try to use "distutils" and "setup.py" to create an C extension

  Now a list of problems:

  1. I'm using automake, autoconf to setup the build-environment
        for example CPPFLAGS

        -> how can I transport the CPPFLAGS on the commandline
                to setup.py 

        I can not use the "define_macros" argument in the setup.py
        script

  2. the following shared library is created:

        build/lib.linux-x86_64-3.0/pymsgque.so

        -> in my tool a test environment is included this mean
                "after" a build but before "install" a test is
                done. this mean that the library have to be found
                and used by the test-environment.

        -> the problem is that the directory name
                "build/lib.linux-x86_64-3.0/"
                is system-depend

        -> question: how I get an unique system independent name
                or just in general how I solve this kind of problem

  3. why is no ".pyd" file created ?

        -> pyd is the extension name supported 


mfg

  Andreas Otto




From mike_kazantsev at fraggod.net  Wed May 20 03:54:52 2009
From: mike_kazantsev at fraggod.net (Mike Kazantsev)
Date: Wed, 20 May 2009 13:54:52 +0600
Subject: optparse options
In-Reply-To: <87bppo7k82.fsf@benfinney.id.au>
References: <dd64aed2-ca3a-4f5e-8d22-d78aa52bb027@d38g2000prn.googlegroups.com>
	<87bppo7k82.fsf@benfinney.id.au>
Message-ID: <4A13B74C.3060404@fraggod.net>

Ben Finney wrote:
> icarus <rsarpi at gmail.com> writes:
> 
>> 	parser = optparse.OptionParser(usage="%prog [-p dir] [--part=dir] ",
>> version="%prog 1.0")
>>
>> 	parser.add_option( "-p", "--part", dest="directory",
>> 	                  help="process target directory", metavar="dir")
>> 	(options, args) = parser.parse_args()

...

>> 	if len(args) != 1:
>> 		parser.error("No options specified")
> 
> The message is confusing, since it doesn't match the condition; it would
> be correct to say ?Did not specify exactly one non-option argument?.
> 
> In this case, it looks like you don't want to check this at all, and
> should instead operate on the basis of the options only.

I also wanted to note that it looks quite illogical and
counter-intuitive to create "required options", since by definition they
should be optional.
Try using arguments instead, with some type-switching flags, if
necessary - it should make CLI more consistent and save some typing by
omitting otherwise always-required option argument ("--part").

-- 
Mike Kazantsev // fraggod.net

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From jeremy at martinfamily.freeserve.co.uk  Wed May 20 04:19:50 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Wed, 20 May 2009 01:19:50 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
Message-ID: <16b51c17-b293-461e-8e87-efed1d35e5ba@o30g2000vbc.googlegroups.com>

On 20 May, 03:43, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Tue, 19 May 2009 03:57:43 -0700, jeremy wrote:
> >> you want it so simple to use that amateurs can mechanically replace
> >> 'for' with 'par' in their code and everything will Just Work, no effort
> >> or thought required.
>
> > Yes I do want the par construction to be simple, but of course you can't
> > just replace a for loop with a par loop in the general case.
>
> But that's exactly what you said you wanted people to be able to do:
>
> "with my suggestion they could potentially get a massive speed up just by
> changing 'for' to 'par' or 'map' to 'pmap'."
>
> I am finding this conversation difficult because it seems to me you don't
> have a consistent set of requirements.
>
> > This issue
> > arises when people use OpenMP: you can take a correct piece of code, add
> > a comment to indicate that a loop is 'parallel', and if you get it wrong
> > the code with no longer work correctly.
>
> How will 'par' be any different? It won't magically turn code with
> deadlocks into bug-free code.
>
> > With my 'par' construct the
> > programmer's intention is made explicit in the code, rather than by a
> > compiler directive and so I think that is clearer than OpenMP.
>
> A compiler directive is just as clear about the programmer's intention as
> a keyword. Possibly even more so.
>
> #$ PARALLEL-LOOP
> for x in seq:
> ? ? do(x)
>
> Seems pretty obvious to me. (Not that I'm suggesting compiler directives
> is a good solution to this problem.)
>
> > As I wrote before, concurrency is one of the hardest things for
> > professional programmers to grasp. For 'amateur' programmers we need to
> > make it as simple as possible,
>
> The problem is that "as simple as possible" is Not Very Simple. There's
> no getting around the fact that concurrency is inherently complex. In
> some special cases, you can keep it simple, e.g. parallel-map with a
> function that has no side-effects. But in the general case, no, you can't
> avoid dealing with the complexity, at least a little bit.
>
> > and I think that a parallel loop
> > construction and the dangers that lurk within would be reasonably
> > straightforward to explain: there are no locks to worry about, no
> > message passing.
>
> It's *already* easy to explain. And having explained it, you still need
> to do something about it. You can't just say "Oh well, I've had all the
> pitfalls explained to me, so now I don't have to actually do anything
> about avoiding those pitfalls". You still need to actually avoid them.
> For example, you can choose one of four tactics:
>
> (1) the loop construct deals with locking;
>
> (2) the caller deals with locking;
>
> (3) nobody deals with locking, therefore the code is buggy and risks
> deadlocks; or
>
> (4) the caller is responsible for making sure he never shares data while
> looping over it.
>
> I don't think I've missed any possibilities. You have to pick one of
> those four.
>
> > The only advanced concept is the 'sync' keyword, which
> > would be used to rendezvous all the threads. That would only be used to
> > speed up certain codes in order to avoid having to repeatedly shut down
> > and start up gangs of threads.
>
> So now you want a second keyword as well.
>
> --
> Steven

Hi Steven,

You wrote:

> I am finding this conversation difficult because it seems to me you don't have a consistent set of requirements".

I think that my position has actually been consistent throughout this
discussion about what I would like to achieve. However I have learned
more about the inner workings of python than I knew before which have
made it clear that it would be difficult to implement (in CPython at
least). And also I never intended to present this as a fait accompli -
the intention was to start a debate as we have been doing. You also
wrote

> So now you want a second keyword as well

I actually described the 'sync' keyword in my second email before
anybody else contributed.

I *do* actually know a bit about concurrency and would never imply
that *any* for loop could be converted to a parallel one. The
intention of my remark "with my suggestion they could potentially get
a massive speed up just by changing 'for' to 'par' or 'map' to
'pmap'." is that it could be applied in the particular circumstances
where there are no dependencies between different iterations of the
loop.

Regarding your implementation strategies, mine would be related to
this one:

> (4) the caller is responsible for making sure he never shares data while
> looping over it.

However in my world there is no problem with threads sharing data as
long as they do not change the values. So the actual rule would be
something like:

5. The caller is responsible for making sure that one iteration of the
parallel loop never tries to write to a variable that another
iteration may read, unless separated by a 'sync' event.

This shows why the sync event is needed - to avoid  race conditions on
shared variables. It is borrowed from the BSP paradigm - although that
is a distibuted memory approach. Without the sync clause, rule 5 would
just be the standard way of defining a parallelisable loop.

Jeremy

P.S. I have a couple of additional embellishments to share at this
stage:

1. Parallel slackness - this is a concept where one creates many more
threads than there are available cores to cover up for a load
imbalance. So you might use this in a case where the iterations you
wish to parallelise take a variable amount of time. I think my par
concept needs a mechanism for the user to specify how many threads to
create - overriding any decision made by Python, e.g.
par 100 i in list: # Create 100 threads no matter how many cores are
available.

2. Scope of the 'sync' command. It was pointed out to me by a
colleague that I need to define what happens with sync when there are
nested par loops. I think that it should be defined to apply to the
innermost par construct which encloses the statement.


From bluefisher80 at gmail.com  Wed May 20 04:20:04 2009
From: bluefisher80 at gmail.com (Jim Qiu)
Date: Wed, 20 May 2009 16:20:04 +0800
Subject: Yet another question about class property.
Message-ID: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>

Hi everyone,

Following is the code i am reading, i don't see anywhere the declaration of
Message.root object,
Where is it from?

#bots-modules
import bots.botslib as botslib
import bots.node as node
from bots.botsconfig import *


class Message(object):
    ''' abstract class; represents a edi message.
        is subclassed as outmessage or inmessage object.
    '''
    def __init__(self):
        self.recordnumber=0                #segment counter. Is not used for
UNT of SE record; some editypes want sequential recordnumbering

    @staticmethod
    def display(records):
        '''for debugging lexed records.'''
        for record in records:
            t = 0
            for veld in record:
                if t==0:
                    print '%s    (Record-id)'%(veld[VALUE])
                else:
                    if veld[SFIELD]:
                        print '        %s    (sub)'%(veld[VALUE])
                    else:
                        print '    %s    (veld)'%(veld[VALUE])
                t += 1

    def get(self,*mpaths):
        ''' query tree (self.root) with mpath; get value (string); get None
if not found.'''
        if self.root.record is None:
            raise botslib.MpathRootError('get("%s"): "root" of incoming
message is empty; either split messages or use inn.getloop'%(str(mpaths)))
        return self.root.get(*mpaths)

    def getnozero(self,*mpaths):
        ''' like get, returns None is value is zero (0) or not numeric.
            Is sometimes usefull in mapping.'''
        if self.root.record is None:
            raise botslib.MpathRootError('get("%s"): "root" of incoming
message is empty; either split messages or use inn.getloop'%(str(mpaths)))
        return self.root.getnozero(*mpaths)

    def getindicator(self,ind,*mpaths):
        ''' like get, returns None is value is zero (0) or not numeric.
            Is sometimes usefull in mapping.'''
        if self.root.record is None:
            raise botslib.MpathRootError('get("%s"): "root" of incoming
message is empty; either split messages or use inn.getloop'%(str(mpaths)))
        return self.root.getindicator(ind,*mpaths)

    def getcount(self):
        ''' count number of nodes in self.root. Number of nodes is number of
records.'''
        return self.root.getcount()

    def getcountoccurrences(self,*mpaths):
        ''' count number of nodes in self.root. Number of nodes is number of
records.'''
        count = 0
        for value in self.getloop(*mpaths):
            count += 1
        return count

    def getcountsum(self,*mpaths):
        ''' return the sum for all values found in mpath. Eg total number of
ordered quantities.'''
        if self.root.record is None:
            raise botslib.MpathRootError('get("%s"): "root" of incoming
message is empty; either split messages or use inn.getloop'%(str(mpaths)))
        return self.root.getcountsum(*mpaths)

    def getloop(self,*mpaths):
        ''' query tree with mpath; generates all the nodes. Is typically
used as: for record in inn.get(mpath):
        '''
        if self.root.record:    #self.root is a real root
            for terug in self.root.getloop(*mpaths): #search recursive for
rest of mpaths
                yield terug
        else:   #self.root is dummy root
            for childnode in self.root.children:
                for terug in childnode.getloop(*mpaths): #search recursive
for rest of mpaths
                    yield terug

    def put(self,*mpaths):
        if self.root.record is None and self.root.children:
            raise botslib.MpathRootError('put("%s"): "root" of outgoing
message is empty; use out.putloop'%(str(mpaths)))
        return self.root.put(*mpaths)

    def putloop(self,*mpaths):
        if not self.root.record:    #no input yet, and start with a
putloop(): dummy root
            if len(mpaths) == 1:
                self.root.append(node.Node(mpaths[0]))
                return self.root.children[-1]
            else: #TODO: what if self.root.record is None and len(mpaths) >
1?
                raise botslib.MpathRootError('putloop("%s"): mpath too
long???'%(str(mpaths)))
        return self.root.putloop(*mpaths)

    def sort(self,*mpaths):
        if self.root.record is None:
            raise botslib.MpathRootError('get("%s"): "root" of message is
empty; either split messages or use inn.getloop'%(str(mpaths)))
        self.root.sort(*mpaths)

    def normalisetree(self,node):
        ''' The node tree is check, sorted, fields are formated etc.
            Always use this method before writing output.
        '''
        #~ node.display()
        #~ print 'normalisetree'
        self._checktree(node,self.defmessage.structure[0])
        self._canonicaltree(node,self.defmessage.structure[0])

    def _checktree(self,tree,structure):
        ''' checks tree with table:
            -   all records should be in table at the right place in
hierarchy
            -   for each record, all fields should be in grammar
            This function checks the root of grammar-structure with root of
node tree
        '''
        if tree.record['BOTSID'] == structure[ID]:
            #check tree recursively with structure
            self._checktreecore(tree,structure)
        else:
            raise botslib.MessageError('(Root)record %s of %s not in table
%s'%(tree.record['BOTSID'],tree.record,self.defmessage.grammarname))

    def _checktreecore(self,node,structure):
        ''' recursive
        '''
        deletelist=[]
        self._checkfields(node.record,structure)
        if node.children and not LEVEL in structure:
            if self.ta_info['checkunknownentities']:
                raise botslib.MessageError('Record "%s" in message has
children, but structure of grammar "%s" not. Found gg
"%s".'%(node.record['BOTSID'],self.defmessage.grammarname,node.children[0].record['BOTSID']))
            node.children=[]
            return
        for childnode in node.children:          #for every node:
            for structure_record in structure[LEVEL]:           #search in
grammar-records
                if childnode.record['BOTSID'] == structure_record[ID]:   #if
found right structure_record
                    #check children recursive
                    self._checktreecore(childnode,structure_record)
                    break    #check next mpathnode
            else:   #checked all structure_record in grammar, but nothing
found
                if self.ta_info['checkunknownentities']:
                    raise botslib.MessageError('Record "%s" in message not
in structure of grammar "%s". Whole record:
"%s".'%(childnode.record['BOTSID'],self.defmessage.grammarname,childnode.record))
                deletelist.append(childnode)
        for child in deletelist:
            node.children.remove(child)


    def _checkfields(self,record,structure_record):
        ''' checks for every field in record if field exists in
structure_record (from grammar).
        '''
        deletelist=[]
        for field in record.keys():          #all fields in record should
exist in structure_record
            for grammarfield in structure_record[FIELDS]:
                if grammarfield[ISFIELD]:    #if field (no composite)
                    if field == grammarfield[ID]:
                        break
                else:   #if composite
                    for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
subfields
                        if field == grammarsubfield[ID]:
                            break
                    else:
                        continue
                    break
            else:
                if self.ta_info['checkunknownentities']:
                    raise botslib.MessageError('Field "%s" does not exist in
record: %s'%(field,structure_record[MPATH]))
                    #~ raise botslib.MessageError('Field "%s" does not exist
in record: %s'%(field,structure_record[ID]))       #alt voor MPATH
                    #~ raise botslib.MessageError('Field "%s" does not exist
in record: %s'%(field,structure_record[FIELDS]))   #folder, text is too long
                deletelist.append(field)
        for field in deletelist:
            del record[field]

    def _canonicaltree(self,node,structure,headerrecordnumber=0):
        ''' For nodes: check min and max occurence; sort the nodes conform
grammar
            For fields: check M/C; format the fields.
        '''
        sortednodelist = []
        self._canonicalfields(node.record,structure,headerrecordnumber)
 #write the fields
        if LEVEL in structure:
            for structure_record in structure[LEVEL]:  #for structure_record
of this level in grammar
                count = 0                           #count number of
occurences of record
                for childnode in node.children:            #for every node
in mpathtree; SPEED: delete nodes from list when found
                    if childnode.record['BOTSID'] != structure_record[ID]:
#if it is not the right NODE":
                        continue
                    count += 1

 self._canonicaltree(childnode,structure_record,self.recordnumber)
#use rest of index in deeper level
                    sortednodelist.append(childnode)
                if structure_record[MIN] > count:
                    raise botslib.MessageError('Record "%s": mandatory but
not present.'%(structure_record[MPATH]))
                if structure_record[MAX] < count:
                    raise botslib.MessageError('Record "%s": occures to
often (%s times).'%(structure_record[MPATH],count))
            node.children=sortednodelist
            if hasattr(self,'do_queries'):
                self.do_queries(node,structure)

    def
_canonicalfields(self,noderecord,structure_record,headerrecordnumber):
        ''' For fields: check M/C; format the fields. Field are not sorted
here (a dict can not be sorted)
        '''
        #~ print noderecord
        for grammarfield in structure_record[FIELDS]:
            if grammarfield[ISFIELD]:    #if field (no composite)
                value = noderecord.get(grammarfield[ID],'')
                #~ print 'check field',grammarfield,value
                if not value:
                    if grammarfield[MANDATORY] == 'M':
                        raise botslib.MessageError('Record "%s": mandatory
field "%s" not filled.'%(structure_record[MPATH],grammarfield[ID]))
                    elif not grammarfield[MINLENGTH]:   #if minlength=0
                        continue
                noderecord[grammarfield[ID]] =
self._formatfield(value,grammarfield,structure_record)
            else:               #if composite
                compositefilled = False
                for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
subfields to see if one of them is there
                    if noderecord.get(grammarsubfield[ID],''):
                        compositefilled = True
                if not compositefilled:
                    if grammarfield[MANDATORY]=='M':
                        raise botslib.MessageError('Record "%s": mandatory
composite "%s" not filled.'%(structure_record[MPATH],grammarfield[ID]))
                    continue
                for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
subfields
                    value = noderecord.get(grammarsubfield[ID],'')
                    #~ print 'check subfield',grammarsubfield,value
                    if not value:
                        if grammarsubfield[MANDATORY]=='M':
                            #~ print 'Record "%s": mandatory subfield "%s"
not filled: "%s".'%(structure_record[MPATH],grammarsubfield[ID],noderecord)
                            raise botslib.MessageError('Record "%s":
mandatory subfield "%s" not filled:
"%s".'%(structure_record[MPATH],grammarsubfield[ID],noderecord))
                        else:
                            continue
                    noderecord[grammarsubfield[ID]] =
self._formatfield(value,grammarsubfield,structure_record)
                    #~ print 'fill',grammarfield[ID]

Thanks in advance.

Jim
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From aotto1968 at t-online.de  Wed May 20 04:52:25 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Wed, 20 May 2009 10:52:25 +0200
Subject: PYTHONPATH on Windows XP module load problem
References: <guubg7$nnk$03$1@news.t-online.com>
	<mailman.390.1242742113.8015.python-list@python.org>
	<guuh3f$47k$00$1@news.t-online.com>
	<SbSdncYZUsrgT4_XnZ2dnUVZ_s2dnZ2d@pdx.net>
Message-ID: <gv0gca$tlf$00$1@news.t-online.com>

Hi,

  after we know how your "bathroom" looks like ...

  I have done additional research.

        1. setup a "setup.py" script
        2. compiled the extension
        3. copy the extension to the test directory
                -> cp ../pymsgque/build/lib.win32-3.0-pydebug/pymsgque.pyd .
        4. start the test

$ python_d.exe ./server.py
Traceback (most recent call last):
  File "./server.py", line 13, in <module>
    import pymsgque
ImportError: No module named pymsgque
[31909 refs]

        -> same as before

        Question:

        -> is the module was not found or
                could a found module not be loaded

mfg

  Andreas Otto


From mohammed.abosalim at gmail.com  Wed May 20 05:05:16 2009
From: mohammed.abosalim at gmail.com (abosalim)
Date: Wed, 20 May 2009 02:05:16 -0700 (PDT)
Subject: SpellChecker
Message-ID: <e48864a4-1d8c-4239-8a8d-f19b85bd51ee@f16g2000vbf.googlegroups.com>

I used this code.It works fine,but on word not whole text.I want to
extend this code to correct
text file not only a word,but i don't know.If you have any help,please
inform me.

This is the code:

import re, collections

def words(text): return re.findall('[a-z]+', text.lower())

def train(features):
    model = collections.defaultdict(lambda: 1)
    for f in features:
        model[f] += 1
    return model

NWORDS = train(words(file('big.txt').read()))

alphabet = 'abcdefghijklmnopqrstuvwxyz'

def edits1(word):
    n = len(word)
    return set([word[0:i]+word[i+1:] for i in range(n)]
+                     # deletion
               [word[0:i]+word[i+1]+word[i]+word[i+2:] for i in range
(n-1)] + # transposition
               [word[0:i]+c+word[i+1:] for i in range(n) for c in
alphabet] + # alteration
               [word[0:i]+c+word[i:] for i in range(n+1) for c in
alphabet])  # insertion

def known_edits2(word):
    return set(e2 for e1 in edits1(word) for e2 in edits1(e1) if e2 in
NWORDS)

def known(words): return set(w for w in words if w in NWORDS)

def correct(word):
    candidates = known([word]) or known(edits1(word)) or known_edits2
(word) or [word]
    return max(candidates, key=lambda w: NWORDS[w])


From mike_kazantsev at fraggod.net  Wed May 20 05:11:39 2009
From: mike_kazantsev at fraggod.net (Mike Kazantsev)
Date: Wed, 20 May 2009 15:11:39 +0600
Subject: Yet another question about class property.
In-Reply-To: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>
References: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>
Message-ID: <4A13C94B.2060805@fraggod.net>

Jim Qiu wrote:
> Hi everyone,
> 
> Following is the code i am reading, i don't see anywhere the declaration of
> Message.root object,
> Where is it from?
...

Prehaps it gets assigned by the parent itself?
Like this:

  def spawn_child(self):
    child = Message()
    child.root = self

-- 
Mike Kazantsev // fraggod.net

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From deets at nospam.web.de  Wed May 20 05:25:36 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 20 May 2009 11:25:36 +0200
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
	<4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>
	<3b84542c-7746-498d-8d9e-977deaecfc1d@r3g2000vbp.googlegroups.com>
	<77g46cF1h8ffnU1@mid.uni-berlin.de>
	<954320a5-10ef-41f3-8a08-c1163be19206@e23g2000vbe.googlegroups.com>
Message-ID: <77i0gcF1etbmmU1@mid.uni-berlin.de>

Paul Boddie wrote:

> On 19 Mai, 18:16, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>>
>> Sorry to say so, but that's nonsense. DOM is not complicated because it
>> contains anything superior - the reason (if any) is that it is formulated
>> as language-agnostic as possible, with the unfortunate result it is
>> rather clumsy to use in all languages.
> 
> Although I presume that people really mean the core standards when
> they talk about "the DOM", not all the other ones related to those
> core standards, the API is not to everyone's taste because, amongst
> other things, it uses functions and methods when some people would
> rather use properties (which actually appear in various places in the
> standards, so it isn't as if the W3C haven't heard of such things),
> and for lots of other subjective reasons: some I can agree with, some
> I put at the same level as a lot of the API-posturing in numerous
> domains where Python code gets written, where such code jostles above
> all other concerns for the coveted "Pythonic" label.
> 
> However, when people are actually choosing to use DOM-related
> technologies, and when those technologies do not necessarily have
> equivalents in whatever other technology stack that could be
> suggested, can we not just take it as read that they actually know
> that the DOM isn't very nice (or that other people don't think that
> it's very nice) and that there are alternatives to the core stuff
> (especially when the inquirer has actually indicated his familiarity
> with those alternatives) and that reminding everyone for the nth time
> about how bad the DOM is (for whatever tangential purpose only
> partially related to the topic under discussion) adds very little if
> anything in the way of advice? It's like someone saying that they're
> going to fly the Atlantic in a 747 only to be told that they should
> drive a Lexus because "Boeing make terrible cars".
> 
> Feel free to replace "DOM" in the above with whatever else fits,
> because this kind of thing comes up all the time.

You could have wrote that same reply when the OP stated that 

"""
It [DOM] might be more
complicated, but that's probably because lots of very smart people
thought about it very carefully and it couldn't be made any simpler.
"""

Which is another way of saying "I know X, but Y is better." 

Also, not trying to convince people that there are better alternatives to
what and how they do something (admittedly, better is subjective, thus
ensues discussion), or gathering arguments on why they do believe their way
is preferable is the very essence of fora like this - if you'd really want
that to go away, we're down to answering the notorious
mutable-default-argument-question.

Diez


From pierre.imbaud at gmail.com  Wed May 20 05:34:53 2009
From: pierre.imbaud at gmail.com (Imbaud Pierre)
Date: Wed, 20 May 2009 11:34:53 +0200
Subject: monitoring friendly applications
Message-ID: <4a13cebd$0$9377$426a74cc@news.free.fr>

I have A LOT of batch applications to monitor, on linux machines, mostly 
written in python.
I have to know:
- which are active, at a given moment?
- when did the last run occur? How long did it last?
- for some daemons: are they stuck? generally, waiting for i/o, or lost 
in some C call.

I could do this (I partly did, btw) thru external processes tools. But 
most processes are python programs, making slight changes is not a 
problem. Thats why I think a python library could help me here; let us 
call it mfa (for monitor friendly application); then one call to 
mfa.in() at start (or at import?), mfa.out() at exit (maybe even on 
exception?), and possibly mfa.loop(), for loop managed daemons. the 
library would open a pipe, or a flow (to a file, a centralizing process, 
a database, a log), and every call make a dated entry. Ideally, the 
application should not be aware of the implementation, especially the 
repository being a file or a db.
Another aspect of process management can be endorsed by the library: 
sometimes only one instance of the process should be active, then 
withdraw if already running.
Not a lot of code to write, but careful design, to keep things simple, 
reliable, only add a low overhead, etc.
By any chance, does something like this exist? Would someone be 
interested with this development?


From __peter__ at web.de  Wed May 20 05:36:25 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 20 May 2009 11:36:25 +0200
Subject: SpellChecker
References: <e48864a4-1d8c-4239-8a8d-f19b85bd51ee@f16g2000vbf.googlegroups.com>
Message-ID: <gv0iuf$db0$02$1@news.t-online.com>

abosalim wrote:

> I used this code.It works fine,but on word not whole text.I want to
> extend this code to correct
> text file not only a word,but i don't know.If you have any help,please
> inform me.

import re
import sys

def correct(word, _lookup={"teh": "the"}):
    """
    Replace with Norvig's implementation found at

    http://norvig.com/spell-correct.html
    """
    return _lookup.get(word.lower(), word)

def correct_word(word):
    corrected = correct(word)
    if corrected != word:
        if word.istitle():
            corrected = corrected.title()
        if word.isupper():
            corrected = corrected.upper()
        print >> sys.stderr, "correcting", word, "-->", corrected
    return corrected

def sub_word(match):
    return correct_word(match.group())

def correct_text(text):
    return re.compile("[a-z]+", re.I).sub(sub_word, text)

if __name__ == "__main__":
    text = "Teh faster teh better TEH BIGGER"
    print "original:", text
    print "corrected:", correct_text(text)


Peter

PS: Don't you get bored if you have all your code written for you?




From mike_kazantsev at fraggod.net  Wed May 20 05:37:25 2009
From: mike_kazantsev at fraggod.net (Mike Kazantsev)
Date: Wed, 20 May 2009 15:37:25 +0600
Subject: SpellChecker
In-Reply-To: <e48864a4-1d8c-4239-8a8d-f19b85bd51ee@f16g2000vbf.googlegroups.com>
References: <e48864a4-1d8c-4239-8a8d-f19b85bd51ee@f16g2000vbf.googlegroups.com>
Message-ID: <4A13CF55.1000607@fraggod.net>

abosalim wrote:
> I used this code.It works fine,but on word not whole text.I want to
> extend this code to correct
> text file not only a word,but i don't know.If you have any help,please
> inform me.
...
> def correct(word):
>     candidates = known([word]) or known(edits1(word)) or known_edits2
> (word) or [word]
>     return max(candidates, key=lambda w: NWORDS[w])

Here I assume that "word" is any string consisting of letters, feel free
to add your own check in place of str.isalpha, like word length or case.
Note that simple ops like concatenation work much faster with buffers
than str / unicode.

  text = 'some text to correct (anything, really)'
  result = buffer('')

  word, c = buffer(''), ''
  for c in text:
    if c.isalpha(): word += c
    else:
      if word:
        result += correct(word)
        word = buffer('')
      result += c

-- 
Mike Kazantsev // fraggod.net

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From paul at boddie.org.uk  Wed May 20 05:39:56 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Wed, 20 May 2009 02:39:56 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
	<7x7i0cmmmk.fsf@ruckus.brouhaha.com> 
	<7f80a17e-1081-46ee-8581-109ca62bdfb7@z5g2000vba.googlegroups.com> 
	<pan.2009.05.20.05.57.39@REMOVE.THIS.cybersource.com.au>
Message-ID: <f7e59ddd-bd0b-42bc-ba78-08f603d47288@o14g2000vbo.googlegroups.com>

On 20 Mai, 07:57, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
>
> Can you explain how you can tell that there are no side-effects from
> x*sqrt(x)+3 ? What if I have this?
>
> class Funny(object):
> ? ? def __add__(self, other):
> ? ? ? ? global parrot
> ? ? ? ? parrot += 1
> ? ? ? ? return 5 + other
>
> x = Funny()

Yes, in general you need whole-program analysis with Python to know if
there are any side-effects or not. That said, with a process forking
mechanism where modified "globals" are not global beyond each process,
you should be able to guard against side-effects more effectively.

Paul


From conra2004 at yahoo.com  Wed May 20 06:00:04 2009
From: conra2004 at yahoo.com (yadin)
Date: Wed, 20 May 2009 03:00:04 -0700 (PDT)
Subject: finding repeated data sequences in a column
Message-ID: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>

Good day everyone!
I have a a table, from where I can extract a column.
I wanna go down trough that column made of numbers
examine undetermined chunks of data and see or detect if that sequence
of chunk
of data has been repeated before
and if it has been repeated detect it by giving it a name in an
adjacent column.
Imagine someting like this but made of 1800 numbers... how can I build
up column 3(category)

Item	price	          Category
400	1000028706	A
400	1000028707	A
400	1000028708	A
101	100	                C
101	12	                C
500	1000028706	A
500	1000028707	A
500	1000028708	A
500	1000028709	B
120	1000028706	A
120	1000028707	A
120	1000028708	A
120	100	                C
120	12	                C


From davea at ieee.org  Wed May 20 06:00:20 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 20 May 2009 06:00:20 -0400
Subject: Yet another question about class property.
In-Reply-To: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>
References: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>
Message-ID: <4A13D4B4.3030809@ieee.org>

Jim Qiu wrote:
> Hi everyone,
>
> Following is the code i am reading, i don't see anywhere the declaration of
> Message.root object,
> Where is it from?
>
> #bots-modules
> import bots.botslib as botslib
> import bots.node as node
> from bots.botsconfig import *
>
>
> class Message(object):
>     ''' abstract class; represents a edi message.
>         is subclassed as outmessage or inmessage object.
>     '''
>     def __init__(self):
>         self.recordnumber=0                #segment counter. Is not used for
> UNT of SE record; some editypes want sequential recordnumbering
>
>     @staticmethod
>     def display(records):
>         '''for debugging lexed records.'''
>         for record in records:
>             t = 0
>             for veld in record:
>                 if t==0:
>                     print '%s    (Record-id)'%(veld[VALUE])
>                 else:
>                     if veld[SFIELD]:
>                         print '        %s    (sub)'%(veld[VALUE])
>                     else:
>                         print '    %s    (veld)'%(veld[VALUE])
>                 t += 1
>
>     def get(self,*mpaths):
>         ''' query tree (self.root) with mpath; get value (string); get None
> if not found.'''
>         if self.root.record is None:
>             raise botslib.MpathRootError('get("%s"): "root" of incoming
> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>         return self.root.get(*mpaths)
>
>     def getnozero(self,*mpaths):
>         ''' like get, returns None is value is zero (0) or not numeric.
>             Is sometimes usefull in mapping.'''
>         if self.root.record is None:
>             raise botslib.MpathRootError('get("%s"): "root" of incoming
> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>         return self.root.getnozero(*mpaths)
>
>     def getindicator(self,ind,*mpaths):
>         ''' like get, returns None is value is zero (0) or not numeric.
>             Is sometimes usefull in mapping.'''
>         if self.root.record is None:
>             raise botslib.MpathRootError('get("%s"): "root" of incoming
> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>         return self.root.getindicator(ind,*mpaths)
>
>     def getcount(self):
>         ''' count number of nodes in self.root. Number of nodes is number of
> records.'''
>         return self.root.getcount()
>
>     def getcountoccurrences(self,*mpaths):
>         ''' count number of nodes in self.root. Number of nodes is number of
> records.'''
>         count = 0
>         for value in self.getloop(*mpaths):
>             count += 1
>         return count
>
>     def getcountsum(self,*mpaths):
>         ''' return the sum for all values found in mpath. Eg total number of
> ordered quantities.'''
>         if self.root.record is None:
>             raise botslib.MpathRootError('get("%s"): "root" of incoming
> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>         return self.root.getcountsum(*mpaths)
>
>     def getloop(self,*mpaths):
>         ''' query tree with mpath; generates all the nodes. Is typically
> used as: for record in inn.get(mpath):
>         '''
>         if self.root.record:    #self.root is a real root
>             for terug in self.root.getloop(*mpaths): #search recursive for
> rest of mpaths
>                 yield terug
>         else:   #self.root is dummy root
>             for childnode in self.root.children:
>                 for terug in childnode.getloop(*mpaths): #search recursive
> for rest of mpaths
>                     yield terug
>
>     def put(self,*mpaths):
>         if self.root.record is None and self.root.children:
>             raise botslib.MpathRootError('put("%s"): "root" of outgoing
> message is empty; use out.putloop'%(str(mpaths)))
>         return self.root.put(*mpaths)
>
>     def putloop(self,*mpaths):
>         if not self.root.record:    #no input yet, and start with a
> putloop(): dummy root
>             if len(mpaths) == 1:
>                 self.root.append(node.Node(mpaths[0]))
>                 return self.root.children[-1]
>             else: #TODO: what if self.root.record is None and len(mpaths) >
> 1?
>                 raise botslib.MpathRootError('putloop("%s"): mpath too
> long???'%(str(mpaths)))
>         return self.root.putloop(*mpaths)
>
>     def sort(self,*mpaths):
>         if self.root.record is None:
>             raise botslib.MpathRootError('get("%s"): "root" of message is
> empty; either split messages or use inn.getloop'%(str(mpaths)))
>         self.root.sort(*mpaths)
>
>     def normalisetree(self,node):
>         ''' The node tree is check, sorted, fields are formated etc.
>             Always use this method before writing output.
>         '''
>         #~ node.display()
>         #~ print 'normalisetree'
>         self._checktree(node,self.defmessage.structure[0])
>         self._canonicaltree(node,self.defmessage.structure[0])
>
>     def _checktree(self,tree,structure):
>         ''' checks tree with table:
>             -   all records should be in table at the right place in
> hierarchy
>             -   for each record, all fields should be in grammar
>             This function checks the root of grammar-structure with root of
> node tree
>         '''
>         if tree.record['BOTSID'] == structure[ID]:
>             #check tree recursively with structure
>             self._checktreecore(tree,structure)
>         else:
>             raise botslib.MessageError('(Root)record %s of %s not in table
> %s'%(tree.record['BOTSID'],tree.record,self.defmessage.grammarname))
>
>     def _checktreecore(self,node,structure):
>         ''' recursive
>         '''
>         deletelist=[]
>         self._checkfields(node.record,structure)
>         if node.children and not LEVEL in structure:
>             if self.ta_info['checkunknownentities']:
>                 raise botslib.MessageError('Record "%s" in message has
> children, but structure of grammar "%s" not. Found gg
> "%s".'%(node.record['BOTSID'],self.defmessage.grammarname,node.children[0].record['BOTSID']))
>             node.children=[]
>             return
>         for childnode in node.children:          #for every node:
>             for structure_record in structure[LEVEL]:           #search in
> grammar-records
>                 if childnode.record['BOTSID'] == structure_record[ID]:   #if
> found right structure_record
>                     #check children recursive
>                     self._checktreecore(childnode,structure_record)
>                     break    #check next mpathnode
>             else:   #checked all structure_record in grammar, but nothing
> found
>                 if self.ta_info['checkunknownentities']:
>                     raise botslib.MessageError('Record "%s" in message not
> in structure of grammar "%s". Whole record:
> "%s".'%(childnode.record['BOTSID'],self.defmessage.grammarname,childnode.record))
>                 deletelist.append(childnode)
>         for child in deletelist:
>             node.children.remove(child)
>
>
>     def _checkfields(self,record,structure_record):
>         ''' checks for every field in record if field exists in
> structure_record (from grammar).
>         '''
>         deletelist=[]
>         for field in record.keys():          #all fields in record should
> exist in structure_record
>             for grammarfield in structure_record[FIELDS]:
>                 if grammarfield[ISFIELD]:    #if field (no composite)
>                     if field == grammarfield[ID]:
>                         break
>                 else:   #if composite
>                     for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
> subfields
>                         if field == grammarsubfield[ID]:
>                             break
>                     else:
>                         continue
>                     break
>             else:
>                 if self.ta_info['checkunknownentities']:
>                     raise botslib.MessageError('Field "%s" does not exist in
> record: %s'%(field,structure_record[MPATH]))
>                     #~ raise botslib.MessageError('Field "%s" does not exist
> in record: %s'%(field,structure_record[ID]))       #alt voor MPATH
>                     #~ raise botslib.MessageError('Field "%s" does not exist
> in record: %s'%(field,structure_record[FIELDS]))   #folder, text is too long
>                 deletelist.append(field)
>         for field in deletelist:
>             del record[field]
>
>     def _canonicaltree(self,node,structure,headerrecordnumber=0):
>         ''' For nodes: check min and max occurence; sort the nodes conform
> grammar
>             For fields: check M/C; format the fields.
>         '''
>         sortednodelist = []
>         self._canonicalfields(node.record,structure,headerrecordnumber)
>  #write the fields
>         if LEVEL in structure:
>             for structure_record in structure[LEVEL]:  #for structure_record
> of this level in grammar
>                 count = 0                           #count number of
> occurences of record
>                 for childnode in node.children:            #for every node
> in mpathtree; SPEED: delete nodes from list when found
>                     if childnode.record['BOTSID'] != structure_record[ID]:
> #if it is not the right NODE":
>                         continue
>                     count += 1
>
>  self._canonicaltree(childnode,structure_record,self.recordnumber)
> #use rest of index in deeper level
>                     sortednodelist.append(childnode)
>                 if structure_record[MIN] > count:
>                     raise botslib.MessageError('Record "%s": mandatory but
> not present.'%(structure_record[MPATH]))
>                 if structure_record[MAX] < count:
>                     raise botslib.MessageError('Record "%s": occures to
> often (%s times).'%(structure_record[MPATH],count))
>             node.children=sortednodelist
>             if hasattr(self,'do_queries'):
>                 self.do_queries(node,structure)
>
>     def
> _canonicalfields(self,noderecord,structure_record,headerrecordnumber):
>         ''' For fields: check M/C; format the fields. Field are not sorted
> here (a dict can not be sorted)
>         '''
>         #~ print noderecord
>         for grammarfield in structure_record[FIELDS]:
>             if grammarfield[ISFIELD]:    #if field (no composite)
>                 value = noderecord.get(grammarfield[ID],'')
>                 #~ print 'check field',grammarfield,value
>                 if not value:
>                     if grammarfield[MANDATORY] == 'M':
>                         raise botslib.MessageError('Record "%s": mandatory
> field "%s" not filled.'%(structure_record[MPATH],grammarfield[ID]))
>                     elif not grammarfield[MINLENGTH]:   #if minlength=0
>                         continue
>                 noderecord[grammarfield[ID]] =
> self._formatfield(value,grammarfield,structure_record)
>             else:               #if composite
>                 compositefilled = False
>                 for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
> subfields to see if one of them is there
>                     if noderecord.get(grammarsubfield[ID],''):
>                         compositefilled = True
>                 if not compositefilled:
>                     if grammarfield[MANDATORY]=='M':
>                         raise botslib.MessageError('Record "%s": mandatory
> composite "%s" not filled.'%(structure_record[MPATH],grammarfield[ID]))
>                     continue
>                 for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
> subfields
>                     value = noderecord.get(grammarsubfield[ID],'')
>                     #~ print 'check subfield',grammarsubfield,value
>                     if not value:
>                         if grammarsubfield[MANDATORY]=='M':
>                             #~ print 'Record "%s": mandatory subfield "%s"
> not filled: "%s".'%(structure_record[MPATH],grammarsubfield[ID],noderecord)
>                             raise botslib.MessageError('Record "%s":
> mandatory subfield "%s" not filled:
> "%s".'%(structure_record[MPATH],grammarsubfield[ID],noderecord))
>                         else:
>                             continue
>                     noderecord[grammarsubfield[ID]] =
> self._formatfield(value,grammarsubfield,structure_record)
>                     #~ print 'fill',grammarfield[ID]
>
> Thanks in advance.
>
> Jim
>
>   
Unlike your previous question, this attribute is not referenced in 
__init__().  That, plus the comment about being an abstract class, leads 
me to guess that the derived classes are required to define this 
attribute.  That's one of the characteristics of an abstract class;  
some of the details are missing, and intended to be supplied by a child 
class.

What do the docs for this abstract class say?  If they don't discuss how 
to implement a concrete class, they're sadly lacking.



From bearophileHUGS at lycos.com  Wed May 20 06:16:49 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Wed, 20 May 2009 03:16:49 -0700 (PDT)
Subject: finding repeated data sequences in a column
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>
Message-ID: <b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>

yadin, understanding what you want is probably 10 times harder than
writing down the code :-)

> I have a a table, from where I can extract a column.

You can extract it? Or do you want to extract it? Or do you want to
process it? Etc.


> I wanna go down trough that column made of numbers
> examine undetermined chunks of data and see or detect if that sequence
> of chunk
> of data has been repeated before

What do you mean by "undetermined"? What kind of data? Where is this
data? How is this "chunk" shaped? Are you talking about a string?


> and if it has been repeated detect it by giving it a name in an
> adjacent column.

What kind of name? So you just need 2 names, like N and S for New and
Seen?
You can use a built-in set data structure to know if you have already
seen some data, while you scan the records.


> Imagine someting like this but made of 1800 numbers...

How are such 1800 disposed? Do you mean 1800 columns of 32 bit
numbers?


> how can I build up column 3(category)<

What does A, B and C mean?

Bye,
bearophile


From piet at cs.uu.nl  Wed May 20 07:08:22 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 20 May 2009 13:08:22 +0200
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
Message-ID: <m2ljosav6h.fsf@cs.uu.nl>

>>>>> walterbyrd <walterbyrd at iname.com> (w) wrote:

>w> On May 8, 5:55?pm, John Yeung <gallium.arsen... at gmail.com> wrote:
>>> On May 8, 3:03?pm,walterbyrd<walterb... at iname.com> wrote:
>>> 
>>> > This works, but it seems like there should be a better way.
>>> 
>>> > --------------
>>> > week = ['sun','mon','tue','wed','thu','fri','sat']
>>> > for day in week[week.index('tue'):week.index('fri')]:
>>> > ? ?print day
>>> > ---------------
>>> 
>>> I think you should provide much more information, primarily why you
>>> want to do this. ?What is the larger goal you are trying to achieve?

>w> I am just looking for a less verbose, more elegant, way to print a
>w> slice of a list. What is hard to understand about that? I am not sure
>w> how enumerated types help.

You didn't say that in the OP.

But you can extend the list type to accept slices with strings in them.
The language spec says they should be ints but apparently this is not
enforced. Of course this makes it vulnerable for future misbehaviour.

class KeyList(list):
    def __getitem__(self, indx):
        if isinstance(indx, slice):
            start = indx.start
            stop = indx.stop
            # add support for step if you want
            if not isinstance(start, int):
                start = self.index(start)
            if not isinstance(stop, int):
                stop = self.index(stop)
            return list.__getitem__(self, slice(start,stop))
        return list.__getitem__(self, indx)

week = KeyList(['sun','mon','tue','wed','thu','fri','sat'])
for day in week['tue':'fri']:
   print day

tue
wed
thu

Note that 'fri' is not included according to standard Python conventions
about the end of a slice. Change the code if you are not happy with it
and you don't mind getting inconsistent semantics.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From jonathan.cervidae at gmail.com  Wed May 20 07:32:01 2009
From: jonathan.cervidae at gmail.com (jcervidae)
Date: Wed, 20 May 2009 04:32:01 -0700 (PDT)
Subject: How do I make pprint do this
Message-ID: <ecb09aa3-abb6-4bc1-9f54-0d312e542266@f16g2000vbf.googlegroups.com>

I cannot get pprint to format output how I would like. pydb does. I
tried grepping the source but still couldn't grok it. Here:

(Pydb) a = range(1,100)
(Pydb) pp a
[1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10, 11, 12, 13, 14, 15, 16, 17,
18, 19, 20
 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
38, 39, 40
 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
58, 59, 60
 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77,
78, 79...]

It puts multiple elements on the same line. I can't work out how to
make it do that.


From nytrokiss at gmail.com  Wed May 20 07:36:36 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Wed, 20 May 2009 14:36:36 +0300
Subject: How to get Form values in Python code and Send Email
In-Reply-To: <8ca278430905192252g67008d31qcd1da318674e30e1@mail.gmail.com>
References: <8ca278430905192252g67008d31qcd1da318674e30e1@mail.gmail.com>
Message-ID: <8a6b8e350905200436s6a31c8dap96d6fededa451b3@mail.gmail.com>

Why don't you use Django? If you get the form information from Django you
can send an email using the send_mail (or even if you don't you can still
import the function.



On Wed, May 20, 2009 at 8:52 AM, Kalyan Chakravarthy <
kalyanchakravarthy at hyit.com> wrote:

> Hi All,
>
>     I have one doubt, I have feedback form (HTML Page) in one website user
> enters all the details and after submitting the page, in back end Python
> class i want to get all those data and send to one email id.
>
> for this please any one can guide me how to do it in  Python( how to get
> HTML form data in Python and send those data as an Email) and Google Apps
>
> Thanks in advance
>
> --
> Regards
> Kalyan
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
http://www.astorandblack.com
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From route6 at ouvaton.org  Wed May 20 07:40:08 2009
From: route6 at ouvaton.org (route6 at ouvaton.org)
Date: Wed, 20 May 2009 04:40:08 -0700 (PDT)
Subject: White NaNs with pcolor (matplotlib)
Message-ID: <24862fcf-522b-4a3c-a35b-881f36cd7066@n8g2000vbb.googlegroups.com>

Hi,

I am trying to display the NaNs in white color when I plot a data map
using pcolor with matplotlib. Does anyone know how to do that? By
default the NaNs are displayed in the color corresponding to the
lowest value in the colorbar.

Thanks,
C


From vinay_sajip at yahoo.co.uk  Wed May 20 08:15:49 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Wed, 20 May 2009 05:15:49 -0700 (PDT)
Subject: Problems with import hooks and encoding
Message-ID: <11597c9b-389b-4a4c-9e64-a52285bbbce8@s28g2000vbp.googlegroups.com>

The simple program

#--------------------------------------
 def main():
     print repr(u'\u2029'.encode('utf-8'))

 if __name__ == "__main__":
     main()
#--------------------------------------

works as expected when run from the command-line, but fails when
converted to an executable using PyInstaller. (For example, if the
executable is created on a Ubuntu Jaunty system but then run on a
Ubuntu Hardy system.) Digging into why this happens leads to the
observation that Py_Initialize calls _PyUnicode_Init, which in turn
causes encodings to be imported via the _codecs module (codecs.c).
However, this appears to happen before the import hook machinery is
set up. Is there a way of intercepting the importing of encodings so
that a "freeze" processor like PyInstaller's launcher can redirect the
import to the package bundled with the executable, rather than any
package provided with a host-installed version of Python?

Regards,

Vinay Sajip


From kalyanchakravarthy at hyit.com  Wed May 20 08:19:47 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Wed, 20 May 2009 17:49:47 +0530
Subject: How to get Form values in Python code and Send Email
In-Reply-To: <8a6b8e350905200436s6a31c8dap96d6fededa451b3@mail.gmail.com>
References: <8ca278430905192252g67008d31qcd1da318674e30e1@mail.gmail.com>
	<8a6b8e350905200436s6a31c8dap96d6fededa451b3@mail.gmail.com>
Message-ID: <8ca278430905200519p7f4e2d10i6ec79b7d75d6dba8@mail.gmail.com>

Hi
    Now i can able to get the form details in to python code,

can any one tell me the format to send form values to one Emil id   ...  for
this  I required SMTP set up?

Thanks in advance

Regards
Kalyan


On Wed, May 20, 2009 at 5:06 PM, James Matthews <nytrokiss at gmail.com> wrote:

> Why don't you use Django? If you get the form information from Django you
> can send an email using the send_mail (or even if you don't you can still
> import the function.
>
>
>
> On Wed, May 20, 2009 at 8:52 AM, Kalyan Chakravarthy <
> kalyanchakravarthy at hyit.com> wrote:
>
>> Hi All,
>>
>>     I have one doubt, I have feedback form (HTML Page) in one website user
>> enters all the details and after submitting the page, in back end Python
>> class i want to get all those data and send to one email id.
>>
>> for this please any one can guide me how to do it in  Python( how to get
>> HTML form data in Python and send those data as an Email) and Google Apps
>>
>> Thanks in advance
>>
>> --
>> Regards
>> Kalyan
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
>
> --
> http://www.astorandblack.com
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
Regards
Kalyan
Mobile no: +91 9985351220
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From Ron.Barak at lsi.com  Wed May 20 08:31:03 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Wed, 20 May 2009 13:31:03 +0100
Subject: How to Spawn a process with P_NOWAIT and pass it some data ?
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A24F8@enbmail01.lsi.com>

Hi,

This is my first try at IPC in Python, and I would like to ask your help with the following problem:

I would like to spawn a process with P_NOWAIT, and pass some data to the child process.

I created two scripts to try IPC (in a blocking way):

$ cat subprocess_sender.py
#!/usr/bin/env python

import subprocess

proc = subprocess.Popen(["python", "-u", "subprocess_receiver.py"], stdin=subprocess.PIPE, shell=True)

proc.communicate(input="this is sent from subprocess_sender.py")[0]
proc.stdin.close()
and

$ cat subprocess_receiver.py
#!/usr/bin/env python

import sys

print sys.stdin.readline()
These scripts intercommunicate nicely:

$ python -u  subprocess_sender.py
this is sent from subprocess_sender.py
The example in the documentation is:
18.1.3.4. Replacing the os.spawn family?<http://docs.python.org/library/subprocess.html#replacing-the-os-spawn-family>

P_NOWAIT example:

pid = os.spawnlp(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg")
==>
pid = Popen(["/bin/mycmd", "myarg"]).pid

But, when I try it in my script:

$ cat subprocess_sender.py
#!/usr/bin/env python

import subprocess

proc = subprocess.Popen(["python", "-u", "subprocess_receiver.py"], stdin=subprocess.PIPE, shell=True).pid

proc.communicate(input="this is sent from subprocess_sender.py")[0]
proc.stdin.close()
proc is now changed from a subprocess.Popen object to an int, namely:

$ python -u  subprocess_sender.py
Traceback (most recent call last):
  File "subprocess_sender.py", line 7, in <module>
    proc.communicate(input="this is sent from subprocess_sender.py")[0]
AttributeError: 'int' object has no attribute 'communicate'
Can anyone suggest what is the correct way to implement P_NOWAIT and still be able to communicate with the child process ?
(Or, is there a way to create a subprocess.Popen object from what I assume is the process handle integer ?)

Thanks,
Ron.

The numbering of the scripts' lines:

$ cat -n subprocess_sender.py
     1  #!/usr/bin/env python
     2
     3  import subprocess
     4
     5  proc = subprocess.Popen(["python", "-u", "subprocess_receiver.py"], stdin=subprocess.PIPE, shell=True).pid
     6
     7  proc.communicate(input="this is sent from subprocess_sender.py")[0]
     8  proc.stdin.close()

$ cat -n subprocess_receiver.py
     1  #!/usr/bin/env python
     2
     3  import sys
     4
     5  print sys.stdin.readline()

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From steve.ferg.bitbucket at gmail.com  Wed May 20 08:33:50 2009
From: steve.ferg.bitbucket at gmail.com (Steve Ferg)
Date: Wed, 20 May 2009 05:33:50 -0700 (PDT)
Subject: Seeking old post on developers who like IDEs vs developers who 
	like simple languages
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<6ZcQl.18366$Ux.8657@tornado.fastwebnet.it>
Message-ID: <b79415ee-5a8d-46ea-9341-e6b3101fd324@j12g2000vbl.googlegroups.com>

> I think you mean this clbuttic post:
> http://osteele.com/archives/2004/11/ides

That's it!  Thanks very much, Marco!!

It is good to read it again.  It is like visiting a place where you
grew up years ago, and finding that it is completely different than
the way you remember it.  It is surprising how much better it is than
my rather crude memory of it.



From jeanmichel at sequans.com  Wed May 20 08:56:38 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 20 May 2009 14:56:38 +0200
Subject: sqlite3, qmarks, and NULL values
In-Reply-To: <p06240801c638f39624e9@[10.0.1.221]>
References: <p06240801c638f39624e9@[10.0.1.221]>
Message-ID: <4A13FE06.4010906@sequans.com>

I fall into the same issue when using postgres. Your main concern is 
that NULL = NULL will return False. Could seems strange but it has much 
advantages sometimes, however this is not the purpose.
I found your solution quite acceptable. Just replace 'if y:' by 'if y is 
None:', add a comment to point that #NULL <> NULL to help any reader 
that is not familiar with db and you got a perfectly readable code.

Of course if you have more complex queries to build you'll have to think 
about an elegant way to manage NULL values. I personally iterate trough 
all my COLs and add a 'COL# = ?' if the value queried is not None. It 
works, it's readable, it's simple, it's python :o)

JM


Mitchell L Model wrote:
> Suppose I have a simple query in sqlite3 in a function:
>
>     def lookupxy(x, y):
>         conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
>                      (x, y))
>
> However, COL2 might be NULL. I can't figure out a value for y that would retrieve rows for which COL2 is NULL. It seems to me that I have to perform an awkward test to determine whether to execute a query with one question mark or two.
>
>     def lookupxy(x, y):
>         if y:
>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
>                          (x, y))
>         else:
>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 IS NULL",
>                          (x,))
>
> The more question marks involved the more complicated this would get, especially if question marks in the middle of several would sometimes need to be NULL. I hope I'm missing something and that someone can tell me what it is.
>   



From iainking at gmail.com  Wed May 20 09:01:31 2009
From: iainking at gmail.com (Iain King)
Date: Wed, 20 May 2009 06:01:31 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
Message-ID: <b11fc5da-fc34-4638-a3c8-dbb53048d386@t10g2000vbg.googlegroups.com>

On May 19, 10:24?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:
> > Let me clarify what I think par, pmap, pfilter and preduce would mean
> > and how they would be implemented.
>
> [...]
>
> Just for fun, I've implemented a parallel-map function, and done a couple
> of tests. Comments, criticism and improvements welcome!
>
> import threading
> import Queue
> import random
> import time
>
> def f(arg): ?# Simulate a slow function.
> ? ? time.sleep(0.5)
> ? ? return 3*arg-2
>
> class PMapThread(threading.Thread):
> ? ? def __init__(self, clients):
> ? ? ? ? super(PMapThread, self).__init__()
> ? ? ? ? self._clients = clients
> ? ? def start(self):
> ? ? ? ? super(PMapThread, self).start()
> ? ? def run(self):
> ? ? ? ? while True:
> ? ? ? ? ? ? try:
> ? ? ? ? ? ? ? ? data = self._clients.get_nowait()
> ? ? ? ? ? ? except Queue.Empty:
> ? ? ? ? ? ? ? ? break
> ? ? ? ? ? ? target, where, func, arg = data
> ? ? ? ? ? ? result = func(arg)
> ? ? ? ? ? ? target[where] = result
>
> class VerbosePMapThread(threading.Thread):
> ? ? def __init__(self, clients):
> ? ? ? ? super(VerbosePMapThread, self).__init__()
> ? ? ? ? print "Thread %s created at %s" % (self.getName(), time.ctime())
> ? ? def start(self):
> ? ? ? ? super(VerbosePMapThread, self).start()
> ? ? ? ? print "Thread %s starting at %s" % (self.getName(), time.ctime())
> ? ? def run(self):
> ? ? ? ? super(VerbosePMapThread, self).run()
> ? ? ? ? print "Thread %s finished at %s" % (self.getName(), time.ctime())
>
> def pmap(func, seq, verbose=False, numthreads=4):
> ? ? size = len(seq)
> ? ? results = [None]*size
> ? ? if verbose:
> ? ? ? ? print "Initiating threads"
> ? ? ? ? thread = VerbosePMapThread
> ? ? else:
> ? ? ? ? thread = PMapThread
> ? ? datapool = Queue.Queue(size)
> ? ? for i in xrange(size):
> ? ? ? ? datapool.put( (results, i, f, seq[i]) )
> ? ? threads = [PMapThread(datapool) for i in xrange(numthreads)]
> ? ? if verbose:
> ? ? ? ? print "All threads created."
> ? ? for t in threads:
> ? ? ? ? t.start()
> ? ? # Block until all threads are done.
> ? ? while any([t.isAlive() for t in threads]):
> ? ? ? ? if verbose:
> ? ? ? ? ? ? time.sleep(0.25)
> ? ? ? ? ? ? print results
> ? ? return results
>
> And here's the timing results:
>
> >>> from timeit import Timer
> >>> setup = "from __main__ import pmap, f; data = range(50)"
> >>> min(Timer('map(f, data)', setup).repeat(repeat=5, number=3))
> 74.999755859375
> >>> min(Timer('pmap(f, data)', setup).repeat(repeat=5, number=3))
>
> 20.490942001342773
>
> --
> Steven

I was going to write something like this, but you've beat me to it :)
Slightly different though; rather than have pmap collate everything
together then return it, have it yield results as and when it gets
them and stop iteration when it's done, and rename it to par to keep
the OP happy and you should get something like what he initially
requests (I think):

total = 0
for score in par(f, data):
    total += score


Iain


From jeanmichel at sequans.com  Wed May 20 09:07:46 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 20 May 2009 15:07:46 +0200
Subject: sqlite3, qmarks, and NULL values
In-Reply-To: <4A13FE06.4010906@sequans.com>
References: <p06240801c638f39624e9@[10.0.1.221]> <4A13FE06.4010906@sequans.com>
Message-ID: <4A1400A2.9040204@sequans.com>

Erratum:

please read 'if y is *not* None:'. (think that if y = 0, you won't 
execute the proper code block with 'if y:').

JM

Jean-Michel Pichavant wrote:
> I fall into the same issue when using postgres. Your main concern is 
> that NULL = NULL will return False. Could seems strange but it has 
> much advantages sometimes, however this is not the purpose.
> I found your solution quite acceptable. Just replace 'if y:' by 'if y 
> is None:', add a comment to point that #NULL <> NULL to help any 
> reader that is not familiar with db and you got a perfectly readable 
> code.
>
> Of course if you have more complex queries to build you'll have to 
> think about an elegant way to manage NULL values. I personally iterate 
> trough all my COLs and add a 'COL# = ?' if the value queried is not 
> None. It works, it's readable, it's simple, it's python :o)
>
> JM
>
>
> Mitchell L Model wrote:
>> Suppose I have a simple query in sqlite3 in a function:
>>
>>     def lookupxy(x, y):
>>         conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
>>                      (x, y))
>>
>> However, COL2 might be NULL. I can't figure out a value for y that 
>> would retrieve rows for which COL2 is NULL. It seems to me that I 
>> have to perform an awkward test to determine whether to execute a 
>> query with one question mark or two.
>>
>>     def lookupxy(x, y):
>>         if y:
>>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 
>> = ?",
>>                          (x, y))
>>         else:
>>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 
>> IS NULL",
>>                          (x,))
>>
>> The more question marks involved the more complicated this would get, 
>> especially if question marks in the middle of several would sometimes 
>> need to be NULL. I hope I'm missing something and that someone can 
>> tell me what it is.
>>   
>



From google at mrabarnett.plus.com  Wed May 20 09:47:03 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 20 May 2009 14:47:03 +0100
Subject: How to Spawn a process with P_NOWAIT and pass it some data ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF6701A24F8@enbmail01.lsi.com>
References: <7F0503CD69378F49BE0DC30661C6CCF6701A24F8@enbmail01.lsi.com>
Message-ID: <4A1409D7.8000403@mrabarnett.plus.com>

Barak, Ron wrote:
> Hi,
>  
> This is my first try at IPC in Python, and I would like to ask your help 
> with the following problem:
>  
> I would like to spawn a process with P_NOWAIT, and pass some data to the 
> child process.
>  
> I created two scripts to try IPC (in a blocking way):
>  
> $ cat subprocess_sender.py
> #!/usr/bin/env python
>  
> import subprocess
>  
> proc = subprocess.Popen(["python", "-u", "subprocess_receiver.py"], 
> stdin=subprocess.PIPE, shell=True)
>  
> proc.communicate(input="this is sent from subprocess_sender.py")[0]
> proc.stdin.close()
> and
>  
> $ cat subprocess_receiver.py
> #!/usr/bin/env python
>  
> import sys
>  
> print sys.stdin.readline()
> These scripts intercommunicate nicely:
>  
> $ python -u  subprocess_sender.py
> this is sent from subprocess_sender.py
> The example in the documentation is:
> 
> 
>       18.1.3.4. Replacing the os.spawn family?
>       <http://docs.python.org/library/subprocess.html#replacing-the-os-spawn-family>
> 
> P_NOWAIT example:
> 
> pid = os.spawnlp(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg")
> ==>
> pid = Popen(["/bin/mycmd", "myarg"]).pid
> 
[snip]
The documentation is showing the 'subprocess' equivalents of older calls
(the 'subprocess' module was added in Python 2.4).

This means is that "Popen" is equivalent to calling "spawnlp" with
P_NOWAIT.


From marco at sferacarta.com  Wed May 20 09:56:59 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Wed, 20 May 2009 15:56:59 +0200
Subject: sqlite3, qmarks, and NULL values
In-Reply-To: <mailman.424.1242778866.8015.python-list@python.org>
References: <mailman.424.1242778866.8015.python-list@python.org>
Message-ID: <L_TQl.20901$Ux.9860@tornado.fastwebnet.it>

Mitchell L Model wrote:

>     def lookupxy(x, y):
>         if y:
>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 = ?",
>                          (x, y))
>         else:
>             conn.execute("SELECT * FROM table WHERE COL1 = ? AND COL2 IS NULL",
>                          (x,))

> The more question marks involved the more complicated this would get, especially if question marks in the middle of several would sometimes need to be NULL. 


With SQLAlchemy you could write:

table.select().where((table.c.col1==x) & (table.c.col2==y))

where x or y are None, the sql engine generates the appropriate "IS 
NULL" clause.


> I hope I'm missing something and that someone can tell me what it is.


Yes, you are missing SQLAlchemy ;)


From invalid at invalid  Wed May 20 10:09:08 2009
From: invalid at invalid (Grant Edwards)
Date: Wed, 20 May 2009 09:09:08 -0500
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
	<bemdncWkNYTJEo_XnZ2dnUVZ_gZi4p2d@posted.usinternet>
	<pan.2009.05.20.03.29.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <Db2dnUEt1-uZkonXnZ2dnUVZ_jNi4p2d@posted.visi>

On 2009-05-20, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

>> Any Python function that isn't calling a library function written in C
>> that releases the GIL won't show any speedup will it?
>
> Not necessarily. Here's another function, that uses a loop instead of 
> sleep.
>
> def g(arg, SIZE=8*10**6):
>     # Default SIZE is chosen so that on my machine, the loop 
>     # takes approximately 0.5 second.
>     for x in xrange(SIZE):
>         pass
>     return 3*arg-2
>
>
>>>> setup = 'from __main__ import pmap, g; data = range(50)'
>>>> min(Timer('map(g, data)', setup).repeat(repeat=5, number=3))
> 65.093590974807739
>>>> min(Timer('pmap(g, data)', setup).repeat(repeat=5, number=3))
> 20.268381118774414

I find that surprising.  Evidently my understanding of the GIL
is wrong.

>> I don't have a multi-core machine to try it on, but what
>> happens when you replace your "slow function" code with
>> something that actually burns CPU using pure-Python code
>> instead of blocking on a timer in the OS?
>
> Two simple work-arounds are:
>
> * use Jython or IronPython; or
>
> * insert time.sleep(0.000001) into your function at various points.

While the latter will allow thread switching, I don't see how
it will increase thread parallelism.

-- 
Grant Edwards                   grante             Yow! WHO sees a BEACH BUNNY
                                  at               sobbing on a SHAG RUG?!
                               visi.com            


From TrevorOKennedy at gmail.com  Wed May 20 10:21:10 2009
From: TrevorOKennedy at gmail.com (Trevor)
Date: Wed, 20 May 2009 07:21:10 -0700 (PDT)
Subject: 2d barcode library?
Message-ID: <0d33db03-cc89-4057-bbc6-5a76dd4b8045@s20g2000vbp.googlegroups.com>

Is anyone aware of a good library for building 2d barcodes (any format
will work for me) and outputing them as some picture format,
presumably png or bmp to be used for html printing? For 1D barcodes a
simple barcode font will suffice, but obviously 2D is not so simple
and i have yet to find the appropriate tool for use in a python
project...


From lists at cheimes.de  Wed May 20 10:29:49 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 20 May 2009 16:29:49 +0200
Subject: 2d barcode library?
In-Reply-To: <0d33db03-cc89-4057-bbc6-5a76dd4b8045@s20g2000vbp.googlegroups.com>
References: <0d33db03-cc89-4057-bbc6-5a76dd4b8045@s20g2000vbp.googlegroups.com>
Message-ID: <gv144t$5gs$1@ger.gmane.org>

Trevor schrieb:
> Is anyone aware of a good library for building 2d barcodes (any format
> will work for me) and outputing them as some picture format,
> presumably png or bmp to be used for html printing? For 1D barcodes a
> simple barcode font will suffice, but obviously 2D is not so simple
> and i have yet to find the appropriate tool for use in a python
> project...

huBarcode [1[ works well for me. It supports qrcode and datamatrix 2d
barcodes. I was able to scan the generated barcodes with my mobile
phone, even from my LCD screen.

Christian

[1] https://cybernetics.hudora.biz/projects/wiki/huBarcode



From deets at nospam.web.de  Wed May 20 10:41:40 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 20 May 2009 16:41:40 +0200
Subject: P2P text chat engine
References: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>
	<76gn8qF1cliefU1@mid.uni-berlin.de>
	<56382643-36d9-436a-9e55-739e82ade7ee@z5g2000vba.googlegroups.com>
Message-ID: <77ij0vF1fckbfU1@mid.uni-berlin.de>

Kirill wrote:

> On 7 ???, 21:23, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>> Navanjo schrieb:
>>
>> > If you have the source code of a p2p text chat engine please send to me
>>
>> I found that & a pot of gold under my bed. Care to give me your address
>> so that I can send it to you?
>>
>> SCNR,
>> Diez
> 
> Hello, can you sent it to me ?
> avekir at gmail.com
> Many thanks!!!

I need a snail-mail address of course, gold isn't really shippable via
email, you know?

Diez


From paul at boddie.org.uk  Wed May 20 10:47:12 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Wed, 20 May 2009 07:47:12 -0700 (PDT)
Subject: Conceptual flaw in pxdom?
References: <7a94692a-52be-423f-b949-522f311061f5@p4g2000vba.googlegroups.com>
	<4a11063e$0$31875$9b4e6d93@newsspool3.arcor-online.net>
	<cbc2c275-2b03-48c9-9106-c7a1a60a09ff@l32g2000vba.googlegroups.com>
	<4a124896$0$30221$9b4e6d93@newsspool1.arcor-online.net>
	<3b84542c-7746-498d-8d9e-977deaecfc1d@r3g2000vbp.googlegroups.com>
	<77g46cF1h8ffnU1@mid.uni-berlin.de>
	<954320a5-10ef-41f3-8a08-c1163be19206@e23g2000vbe.googlegroups.com>
	<77i0gcF1etbmmU1@mid.uni-berlin.de>
Message-ID: <a2b16ce8-4a03-4bf0-947c-bb957a46b013@n8g2000vbb.googlegroups.com>

On 20 Mai, 11:25, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> Also, not trying to convince people that there are better alternatives to
> what and how they do something (admittedly, better is subjective, thus
> ensues discussion), or gathering arguments on why they do believe their way
> is preferable is the very essence of fora like this - if you'd really want
> that to go away, we're down to answering the notorious
> mutable-default-argument-question.

Yes, but the inquirer wasn't asking for general advice on what to use.
Again, if you're intending to use (or are constrained to using) one
thing, having people tell you to use something else has limited
benefits. I don't necessarily agree with the statements about the DOM
being particularly well thought out, but those were made to the
already-issued tangential advice which seems to be the norm on python-
list/comp.lang.python.

It's nice to see that one person responded to the inquirer's original
message, anyway, rather than attempt to "educate" him under the
assumption that he doesn't at all know what he's doing. In Google
Groups, you can see the "profile" of people and work out what they
seem to know fairly easily - a useful tool for anyone who doesn't
remember who asked what. Maybe some liberal usage of tools like that
would have saved us eight or so messages in this thread already.

Paul


From steko at iosa.it  Wed May 20 11:14:44 2009
From: steko at iosa.it (Stefano Costa)
Date: Wed, 20 May 2009 15:14:44 +0000 (UTC)
Subject: package with executable
References: <1242759252.4438.114.camel@gibreel>
	<200905200701.39370.a.cavallo@cavallinux.eu>
Message-ID: <pan.2009.05.20.15.15.55@iosa.it>

Il Wed, 20 May 2009 07:01:39 +0100, A. Cavallo ha scritto:

> With the standard distutils (no need for setuptools) the config.py file
> might look like:

Right, I ended up using setuptools just because I used paster to create 
the project layout. I'll think about using plain distutils instead.

> import gnucal must work. If you're developing from the sources (eg.
> without having the package installed) you need to be in the same dir
> where the gnucal.py is or you need to set PYTHONPATH in order to find
> the directory gnucal (the one containing __init__.py).

Right now, the problem is that upon installing "import gnucal" works in 
the python interactive interpreter, but gnucal.py raises an exception 
that it's not able to import gnucal.core and friends.

> At line 101 the statement sys.exit("Please.. should be
> parser.error("Please..

Good point! Thanks,
steko



From varguna at gmail.com  Wed May 20 11:17:50 2009
From: varguna at gmail.com (Aytekin Vargun)
Date: Wed, 20 May 2009 11:17:50 -0400
Subject: popen - reading strings - constructing a list from the strings
Message-ID: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>

 <python-list at python.org>
Hello everybody,
I have a question about the way I use os.popen. I am open to other
alternative suggestions like using subprocess or communicate.

I have an executable (say read_cell_types.exe) that produces string outputs.
For example, after one execution I got the following outputs in one line:

Neurons Microglia Astrocytes

In another execution, there might be different numbers of strings.

What I would like to do is to get these strings after running
read_cell_types.exe from my python program dynamically  and construct radio
buttons from the list of strings. In order to do this I need to construct a
list of strings first as in

["Neurons" "Microglia" "Astrocytes"]

Then it is easy to construct the radio buttons.

When I use the following code

command = "read_cell_types " + fileName2
child = os.popen(command)
data = child.read()
allObjects=data

allObjects (or data) contains the letters of all string words. I think it is
probably like ["N" "e" "u" "r"  ...]

How can I construct ["Neurons" "Microglia" "Astrocytes"] instead?

I will really appreciate your help.
Thanks a lot.

PS: fileName2 is a parameter  that I am passing to read_cell_types.exe

Aytekin

-- 
My web page: http://www.cs.rpi.edu/~vargua
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From paul at boddie.org.uk  Wed May 20 11:25:15 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Wed, 20 May 2009 08:25:15 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
	<b11fc5da-fc34-4638-a3c8-dbb53048d386@t10g2000vbg.googlegroups.com>
Message-ID: <cb381837-e878-47d1-88cd-8bd8069f0717@z5g2000vba.googlegroups.com>

On 20 Mai, 15:01, Iain King <iaink... at gmail.com> wrote:
>
> I was going to write something like this, but you've beat me to it :)
> Slightly different though; rather than have pmap collate everything
> together then return it, have it yield results as and when it gets
> them and stop iteration when it's done, and rename it to par to keep
> the OP happy and you should get something like what he initially
> requests (I think):
>
> total = 0
> for score in par(f, data):
> ? ? total += score

It depends on whether you want the outputs to correspond to the inputs
in the resulting sequence. If pmap is supposed to behave like map, you
want the positions of each input and corresponding output to match. As
I wrote earlier, in pprocess you distinguish between these cases by
employing maps (for input/output correspondence) and queues (for
"first ready" behaviour).

I don't recall whether the Map class in pprocess blocks for all the
data to be returned, or whether you can consume any outputs that are
at the start of the output sequence (and then block until output
arrives at the next available position), but this would be a logical
enhancement.

Paul


From google at mrabarnett.plus.com  Wed May 20 11:35:40 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 20 May 2009 16:35:40 +0100
Subject: popen - reading strings - constructing a list from the strings
In-Reply-To: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>
References: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>
Message-ID: <4A14234C.3090404@mrabarnett.plus.com>

Aytekin Vargun wrote:
> <mailto:python-list at python.org>
> Hello everybody,
> I have a question about the way I use os.popen. I am open to other 
> alternative suggestions like using subprocess or communicate.
> 
> I have an executable (say read_cell_types.exe) that produces string 
> outputs. For example, after one execution I got the following outputs in 
> one line:
> 
> Neurons Microglia Astrocytes
> 
> In another execution, there might be different numbers of strings.
> 
> What I would like to do is to get these strings after running 
> read_cell_types.exe from my python program dynamically  and construct 
> radio buttons from the list of strings. In order to do this I need to 
> construct a list of strings first as in
> 
> ["Neurons" "Microglia" "Astrocytes"]
> 
> Then it is easy to construct the radio buttons.
> 
> When I use the following code
> 
> command = "read_cell_types " + fileName2           
> child = os.popen(command)
> data = child.read()
> allObjects=data
> 
> allObjects (or data) contains the letters of all string words. I think 
> it is probably like ["N" "e" "u" "r"  ...]
> 
> How can I construct ["Neurons" "Microglia" "Astrocytes"] instead?
> 
> I will really appreciate your help.
> Thanks a lot.
> 
> PS: fileName2 is a parameter  that I am passing to read_cell_types.exe
> 
If the words in the string are separated by whitespace then use
allObjects.split().


From skip at pobox.com  Wed May 20 11:37:27 2009
From: skip at pobox.com (skip at pobox.com)
Date: Wed, 20 May 2009 10:37:27 -0500
Subject: How do I make pprint do this
In-Reply-To: <ecb09aa3-abb6-4bc1-9f54-0d312e542266@f16g2000vbf.googlegroups.com>
References: <ecb09aa3-abb6-4bc1-9f54-0d312e542266@f16g2000vbf.googlegroups.com>
Message-ID: <18964.9143.736748.614038@montanaro.dyndns.org>

    >> I cannot get pprint to format output how I would like. pydb does. I
    >> tried grepping the source but still couldn't grok it.

That's not the way pprint works.  You have no control over how it arranges
its output.  If you need something more flexible you'll have to roll your
own.

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/
    America's vaunted "free press" notwithstanding, story ideas that expose
    the unseemly side of actual or potential advertisers tend to fall by the
    wayside.  Not quite sure why.  -- Jim Thornton


From walterbyrd at iname.com  Wed May 20 11:52:56 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Wed, 20 May 2009 08:52:56 -0700 (PDT)
Subject: Trying to understand a very simple class - from the book "dive into 
	python"
Message-ID: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>

Example?5.6.?Coding the FileInfo Class
class FileInfo(UserDict):
    "store file metadata"
    def __init__(self, filename=None):
        UserDict.__init__(self)        (1)
        self["name"] = filename        (2)


What I do not understand is the last line. I thought 'self' was
supposed to refer to an instance of the object. But the square
brackets seem to indicate a list. Except you can not assign values to
a list like that. So where does "name" come from?

I am sure this is totally simple, but I missing something.


From conra2004 at yahoo.com  Wed May 20 11:55:25 2009
From: conra2004 at yahoo.com (yadin)
Date: Wed, 20 May 2009 08:55:25 -0700 (PDT)
Subject: finding repeated data sequences in a column
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>
	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>
Message-ID: <ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>

On May 20, 11:16?am, bearophileH... at lycos.com wrote:
> yadin, understanding what you want is probably 10 times harder than
> writing down the code :-)
>
> > I have a a table, from where I can extract a column.
>
> You can extract it? Or do you want to extract it? Or do you want to
> process it? Etc.
>
> > I wanna go down trough that column made of numbers
> > examine undetermined chunks ofdataand see or detect if that sequence
> > of chunk
> > ofdatahas beenrepeatedbefore
>
> What do you mean by "undetermined"? What kind ofdata? Where is thisdata? How is this "chunk" shaped? Are you talking about a string?
>
> > and if it has beenrepeateddetect it by giving it a name in an
> > adjacent column.
>
> What kind of name? So you just need 2 names, like N and S for New and
> Seen?
> You can use a built-in setdatastructure to know if you have already
> seen somedata, while you scan the records.
>
> > Imagine someting like this but made of 1800 numbers...
>
> How are such 1800 disposed? Do you mean 1800 columns of 32 bit
> numbers?
>
> > how can I build up column 3(category)<
>
> What does A, B and C mean?
>
> Bye,
> bearophile

lets say you have this column of numbers

1000028706
1000028707
1000028708
100
12
1000028706
1000028707
1000028708
1000028709
1000028706
1000028707
1000028708
100
12
6

How can I build up a program that tells me that this sequence
1000028706
1000028707
1000028708
is repeated somewhere in the column, and how can i know where?

thank you very much!


From kyrie at uh.cu  Wed May 20 11:59:26 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 20 May 2009 11:59:26 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com>
	<a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com>
Message-ID: <200905201159.26609.kyrie@uh.cu>

On Monday 18 May 2009 10:31:06 pm Carl Banks wrote:
> Even if you decided to accept the penalty and add locking to
> refcounts, you still have to be prepared for context switching at any
> time when writing C code, which means in practice you have to lock any
> object that's being accessed--that's in addition to the refcount lock.

While I agree that the GIL greatly simplifies things for the interpreter, I 
don't understand this statement. In practice, you should lock all critical 
sections if you expect your code to be used in a multithreading environment. 
That can't be different from what Java, C# or any other languages do, 
including C++. Why is that so expensive in python extensions, that it is used 
as an argument against removing the GIL?

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From marco at sferacarta.com  Wed May 20 11:59:36 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Wed, 20 May 2009 17:59:36 +0200
Subject: Trying to understand a very simple class - from the book "dive
	into  python"
In-Reply-To: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
References: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
Message-ID: <LNVQl.21081$Ux.11632@tornado.fastwebnet.it>

walterbyrd wrote:

 > I am sure this is totally simple, but I missing something.

Do you know what a dictionary is?



From kdawg44 at gmail.com  Wed May 20 12:06:56 2009
From: kdawg44 at gmail.com (K-Dawg)
Date: Wed, 20 May 2009 12:06:56 -0400
Subject: URGENT! Changing IE PAC Settings with Python
Message-ID: <5caea3690905200906w1c11bb08yf6068ee831038287@mail.gmail.com>

Hello,

Thanks for any response.  I am in a crisis where one of our networking guys
moved where our PAC file is housed.  There was a group policy set in Active
Directory that set the PAC file location in Internet Explorer to the new
location.

However, we have 100 remote centers that have about 3 to 4 machines that are
not on AD (from before an AD migration).  These machines did not receive the
update.

Is there a way I can write a python script to run from my machine to jump
out to a list
--
Kevin Holleran
Master of Science, Computer Information Systems
Grand Valley State University
Master of Business Administration
Western Michigan University
Completion December 2009
CCNA, ISA, MCSA, MCDST, MCP

"We are what we repeatedly do. Excellence, then, is not an act, but a
habit." - Aristotle

"A man flattened by an opponent can get up again. A man flattened by
conformity stays down for good. " - Thomas J. Watson
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From walterbyrd at iname.com  Wed May 20 12:08:08 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Wed, 20 May 2009 09:08:08 -0700 (PDT)
Subject: Is there a better way to chose a slice of a list?
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com> 
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com> 
	<873ab07jpx.fsf@benfinney.id.au>
Message-ID: <83650e78-b0e9-4dcb-a0ff-ec369794a1d8@b7g2000pre.googlegroups.com>

On May 19, 5:31?pm, Ben Finney <ben+pyt... at benfinney.id.au> wrote:

> That's just the same micro-goal re-stated. What is your larger problem
> of which this is a part? Perhaps a better approach can be suggested when
> that context is known.

I am processing a huge spreadsheet which I have converted to a csv
format. Each row will be a wiki page with several sub-headings. The
spreadsheet contains information about servers. Wiki sub-headings may
include: 'hardware', 'software', 'users', 'network swith settings'.
'Hardware' may include the spreadsheet columns: 'memory', 'cpu', and
so on. So the first six columns in the spreadsheet may go under
'hardware' the next six under 'software' and so on.

I have already created the wiki pages, using a method similar to what
I first posted. But, it seems like there should be a better way to to
do it. So, for future reference, I was just wondering.



From walterbyrd at iname.com  Wed May 20 12:10:51 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Wed, 20 May 2009 09:10:51 -0700 (PDT)
Subject: Trying to understand a very simple class - from the book "dive 
	into python"
References: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
	<LNVQl.21081$Ux.11632@tornado.fastwebnet.it>
Message-ID: <1960e2d0-4d7b-448a-b701-65f36117059b@d19g2000prh.googlegroups.com>

On May 20, 9:59?am, Marco Mariani <ma... at sferacarta.com> wrote:

> Do you know what a dictionary is?

Yes, but I thought  a dictionary used curly brackets. Is the object a
dictionary?


From deets at nospam.web.de  Wed May 20 12:18:05 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 20 May 2009 18:18:05 +0200
Subject: Trying to understand a very simple class - from the book "dive
	into python"
References: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
	<LNVQl.21081$Ux.11632@tornado.fastwebnet.it>
	<1960e2d0-4d7b-448a-b701-65f36117059b@d19g2000prh.googlegroups.com>
Message-ID: <77iolnF1evfleU1@mid.uni-berlin.de>

walterbyrd wrote:

> On May 20, 9:59?am, Marco Mariani <ma... at sferacarta.com> wrote:
> 
>> Do you know what a dictionary is?
> 
> Yes, but I thought  a dictionary used curly brackets. Is the object a
> dictionary?

foo = {"key" : "i'm the value of a dictionary"}
print foo["key"]

I suggest you read the tutorial:

http://docs.python.org/tutorial/datastructures.html#dictionaries

Diez


From robert.kern at gmail.com  Wed May 20 12:23:09 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 20 May 2009 11:23:09 -0500
Subject: How do I make pprint do this
In-Reply-To: <18964.9143.736748.614038@montanaro.dyndns.org>
References: <ecb09aa3-abb6-4bc1-9f54-0d312e542266@f16g2000vbf.googlegroups.com>
	<18964.9143.736748.614038@montanaro.dyndns.org>
Message-ID: <gv1apf$suh$1@ger.gmane.org>

On 2009-05-20 10:37, skip at pobox.com wrote:
>      >>  I cannot get pprint to format output how I would like. pydb does. I
>      >>  tried grepping the source but still couldn't grok it.
>
> That's not the way pprint works.  You have no control over how it arranges
> its output.  If you need something more flexible you'll have to roll your
> own.

Or use Armin Ronacher's excellent pretty.py:

   http://dev.pocoo.org/hg/sandbox/file/tip/pretty

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From python.list at tim.thechases.com  Wed May 20 12:25:45 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 20 May 2009 11:25:45 -0500
Subject: finding repeated data sequences in a column
In-Reply-To: <ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
Message-ID: <4A142F09.5010200@tim.thechases.com>

> lets say you have this column of numbers
> 
> 1000028706
> 1000028707
> 1000028708
> 100
> 12
> 1000028706
> 1000028707
> 1000028708
> 1000028709
> 1000028706
> 1000028707
> 1000028708
> 100
> 12
> 6
> 
> How can I build up a program that tells me that this sequence
> 1000028706
> 1000028707
> 1000028708
> is repeated somewhere in the column, and how can i know where?

In your example, would "100,12" also be output, or do you only 
care about the first find?  Do you have a minimum or maximum 
number of repeats you care about?  Is a repeated number a 
"sequence of length 1"?  Can it be capped to know that if you 
have more than N items in common, you don't have to compare more 
than N items from the entire pair of sequences?

-tkc





From norseman at hughes.net  Wed May 20 12:40:41 2009
From: norseman at hughes.net (norseman)
Date: Wed, 20 May 2009 09:40:41 -0700
Subject: popen - reading strings - constructing a list from the strings
In-Reply-To: <4A14234C.3090404@mrabarnett.plus.com>
References: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>
	<4A14234C.3090404@mrabarnett.plus.com>
Message-ID: <4A143289.2030506@hughes.net>

MRAB wrote:
> Aytekin Vargun wrote:
>> <mailto:python-list at python.org>
>> Hello everybody,
>> I have a question about the way I use os.popen. I am open to other 
>> alternative suggestions like using subprocess or communicate.
>>
>> I have an executable (say read_cell_types.exe) that produces string 
>> outputs. For example, after one execution I got the following outputs 
>> in one line:
>>
>> Neurons Microglia Astrocytes
>>
>> In another execution, there might be different numbers of strings.
>>
>> What I would like to do is to get these strings after running 
>> read_cell_types.exe from my python program dynamically  and construct 
>> radio buttons from the list of strings. In order to do this I need to 
>> construct a list of strings first as in
>>
>> ["Neurons" "Microglia" "Astrocytes"]
>>
>> Then it is easy to construct the radio buttons.
>>
>> When I use the following code
>>
>> command = "read_cell_types " + fileName2           child = 
>> os.popen(command)
>> data = child.read()
>> allObjects=data
>>
>> allObjects (or data) contains the letters of all string words. I think 
>> it is probably like ["N" "e" "u" "r"  ...]
>>
>> How can I construct ["Neurons" "Microglia" "Astrocytes"] instead?
>>
>> I will really appreciate your help.
>> Thanks a lot.
>>
>> PS: fileName2 is a parameter  that I am passing to read_cell_types.exe
>>
> If the words in the string are separated by whitespace then use
> allObjects.split().
=================================================
 From actual code:
Python 2.5.2 with Tkinker supplied with download
Linux Slackware 10.2
Same files tested with identical results on Windows XP Pro
   (the .bin was changed to use the .exe compile on Window$ :)


import os

Scenario 1
               required    optional     optional
               .exe file   token(s)     redirected output
xx= os.popen("shp2dxf.bin al963424.shp >al963424.dxf").readlines()

Then use the output file any way you want.
                ----------

Scenerio 2
xx= os.popen("shp2dxf.bin al963424.shp").readlines()

for i in xx:
   print "\t"+i[:-1]


change the print to the code to process your strings (0r don't and use
it to show progress and just add code to process your strings.)

                ----------

The processed strings can be formatted into a list like below.  The
code (left side) can be left blank and you can fill it in manually or
numbers can be used or whatever you like. In this example, the right
side is what I want to be on the button(s).
          ("string", "same_string") is OK too.

   AttTyp = [
     ("S", "Single Use"),
     ("I", "Intercropping"),
     ("D", "Double Cropping"),
     ("T", "Triple Cropping"),
     ("M", "Mixed Land Use"),
     ("-","---------------"),
     ("t", "Toggle Table Display"),
   ]


Next, this will read the above list and generate the actual buttons if
you are using Tkinter.

   AttB= []
   for mode, text in AttTyp:
     c= Radiobutton(frameAtt, text=text, indicatoron=0,
          variable=AttVal, value=mode, command=getAttTyp)
     AttB.append(c)
     c.pack()
   AttB[5].config(state = DISABLED)  #grays out button
   AttB[6].config(state = DISABLED)  #(state= NORMAL) returns to live


Using the append() allows button control from other parts of the
program. It is not required for the buttons to work, but good to have.
*variable* is what is passed to python. AttVal in the example.
Python reads it by using AttVal.get(). As in if AttVal.get() == ??..
or perhaps  local_var_in_function= AttVal.get().
If you reverse the variables mode and text in the 'for mode...' line
then you need to reverse the two strings on each line of the feed list.
(Or exchange their places in the assignment section :)

Using mode and text as the vars, text goes on the button for the human
to read and mode is the internal value to test to determine which
button got pressed. The names mode and text are arbitrary. Name them as
you wish but place each appropriately in the assignment section.


Happy coding.

Today is 20090520
Steve




From jyasskin at gmail.com  Wed May 20 12:40:42 2009
From: jyasskin at gmail.com (Jeffrey Yasskin)
Date: Wed, 20 May 2009 09:40:42 -0700
Subject: [unladen-swallow] PEP 384: Defining a Stable ABI
In-Reply-To: <4A107988.3020202@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>
Message-ID: <5d44f72f0905200940k4a40f638j5637a6b79d075b0@mail.gmail.com>

A couple thoughts:

I'm with the people who think the refcount should be accessed through
functions by apps that want ABI compatibility. In particular,
GIL-removal efforts are guaranteed to change how the refcount is
modified, but there's a good chance they wouldn't have to change the
API. (We have some ideas for how to maintain source compatibility in
the absence of a GIL:
http://code.google.com/p/unladen-swallow/wiki/ExtensionModules#Reference_Counting)
Over an 8-year lifetime for Python 3, Moore's law predicts that
desktop systems will have up to 64 cores, at which point even the
simplest GIL-removal strategy of making refcounts atomic will be a
win, despite the 2x performance loss for a single thread. I wouldn't
want an ABI to rule that out.

I do think the refcounting macros should remain present in the API
(not ABI) for apps that only need source compatibility and want the
extra speed.

I wonder if it makes sense to specify an API compatibility mode in
this PEP too.

"Py_LIMITED_API" may not be the right macro name?it didn't imply
anything about an ABI when I first saw it. Might it make sense to use
Py_ABI_COMPATIBILITY=### instead? (Where ### could be an ISO date like
20090520.) That would put "ABI" in the macro name and make it easier
to define new versions later if necessary. (New versions would help
people compile against a new version of Python and be confident they
had something that would run against old versions.) If we never define
a new version, defining it to a number instead of just anything
doesn't really hurt.

It's probably worth pointing out in the PEP that the fact that
PyVarObject.ob_size is part of the ABI means that PyObject cannot
change size, even by adding fields at the end.

Right now, the globals representing types are defined like
"PyAPI_DATA(PyTypeObject) PyList_Type;". To allow the core to use the
new type creation functions, it might be useful to make the ABI type
objects PyTypeObject* constants instead.

In general, this looks really good. Thanks!

Jeffrey

On Sun, May 17, 2009 at 1:54 PM, "Martin v. L?wis" <martin at v.loewis.de> wrote:
>
> Thomas Wouters reminded me of a long-standing idea; I finally
> found the time to write it down.
>
> Please comment!
>
> Regards,
> Martin
>
> PEP: 384
> Title: Defining a Stable ABI
> Version: $Revision: 72754 $
> Last-Modified: $Date: 2009-05-17 21:14:52 +0200 (So, 17. Mai 2009) $
> Author: Martin v. L?wis <martin at v.loewis.de>
> Status: Draft
> Type: Standards Track
> Content-Type: text/x-rst
> Created: 17-May-2009
> Python-Version: 3.2
> Post-History:
>
> Abstract
> ========
>
> Currently, each feature release introduces a new name for the
> Python DLL on Windows, and may cause incompatibilities for extension
> modules on Unix. This PEP proposes to define a stable set of API
> functions which are guaranteed to be available for the lifetime
> of Python 3, and which will also remain binary-compatible across
> versions. Extension modules and applications embedding Python
> can work with different feature releases as long as they restrict
> themselves to this stable ABI.
>
> Rationale
> =========
>
> The primary source of ABI incompatibility are changes to the lay-out
> of in-memory structures. For example, the way in which string interning
> works, or the data type used to represent the size of an object, have
> changed during the life of Python 2.x. As a consequence, extension
> modules making direct access to fields of strings, lists, or tuples,
> would break if their code is loaded into a newer version of the
> interpreter without recompilation: offsets of other fields may have
> changed, making the extension modules access the wrong data.
>
> In some cases, the incompatibilities only affect internal objects of
> the interpreter, such as frame or code objects. For example, the way
> line numbers are represented has changed in the 2.x lifetime, as has
> the way in which local variables are stored (due to the introduction
> of closures). Even though most applications probably never used these
> objects, changing them had required to change the PYTHON_API_VERSION.
>
> On Linux, changes to the ABI are often not much of a problem: the
> system will provide a default Python installation, and many extension
> modules are already provided pre-compiled for that version. If additional
> modules are needed, or additional Python versions, users can typically
> compile them themselves on the system, resulting in modules that use
> the right ABI.
>
> On Windows, multiple simultaneous installations of different Python
> versions are common, and extension modules are compiled by their
> authors, not by end users. To reduce the risk of ABI incompatibilities,
> Python currently introduces a new DLL name pythonXY.dll for each
> feature release, whether or not ABI incompatibilities actually exist.
>
> With this PEP, it will be possible to reduce the dependency of binary
> extension modules on a specific Python feature release, and applications
> embedding Python can be made work with different releases.
>
> Specification
> =============
>
> The ABI specification falls into two parts: an API specification,
> specifying what function (groups) are available for use with the
> ABI, and a linkage specification specifying what libraries to link
> with. The actual ABI (layout of structures in memory, function
> calling conventions) is not specified, but implied by the
> compiler. As a recommendation, a specific ABI is recommended for
> selected platforms.
>
> During evolution of Python, new ABI functions will be added.
> Applications using them will then have a requirement on a minimum
> version of Python; this PEP provides no mechanism for such
> applications to fall back when the Python library is too old.
>
> Terminology
> -----------
>
> Applications and extension modules that want to use this ABI
> are collectively referred to as "applications" from here on.
>
> Header Files and Preprocessor Definitions
> -----------------------------------------
>
> Applications shall only include the header file Python.h (before
> including any system headers), or, optionally, include pyconfig.h, and
> then Python.h.
>
> During the compilation of applications, the preprocessor macro
> Py_LIMITED_API must be defined. Doing so will hide all definitions
> that are not part of the ABI.
>
> Structures
> ----------
>
> Only the following structures and structure fields are accessible to
> applications:
>
> - PyObject (ob_refcnt, ob_type)
> - PyVarObject (ob_base, ob_size)
> - Py_buffer (buf, obj, len, itemsize, readonly, ndim, shape,
> ?strides, suboffsets, smalltable, internal)
> - PyMethodDef (ml_name, ml_meth, ml_flags, ml_doc)
> - PyMemberDef (name, type, offset, flags, doc)
> - PyGetSetDef (name, get, set, doc, closure)
>
> The accessor macros to these fields (Py_REFCNT, Py_TYPE, Py_SIZE)
> are also available to applications.
>
> The following types are available, but opaque (i.e. incomplete):
>
> - PyThreadState
> - PyInterpreterState
>
> Type Objects
> ------------
>
> The structure of type objects is not available to applications;
> declaration of "static" type objects is not possible anymore
> (for applications using this ABI).
> Instead, type objects get created dynamically. To allow an
> easy creation of types (in particular, to be able to fill out
> function pointers easily), the following structures and functions
> are available::
>
> ?typedef struct{
> ? ?int slot; ? ?/* slot id, see below */
> ? ?void *pfunc; /* function pointer */
> ?} PyType_Slot;
>
> ?struct{
> ? ?const char* name;
> ? ?const char* doc;
> ? ?int basicsize;
> ? ?int itemsize;
> ? ?int flags;
> ? ?PyType_Slot *slots; /* terminated by slot==0. */
> ?} PyType_Spec;
>
> ?PyObject* PyType_FromSpec(PyType_Spec*);
>
> To specify a slot, a unique slot id must be provided. New Python
> versions may introduce new slot ids, but slot ids will never be
> recycled. Slots may get deprecated, but continue to be supported
> throughout Python 3.x.
>
> The slot ids are named like the field names of the structures that
> hold the pointers in Python 3.1, with an added ``Py_`` prefix (i.e.
> Py_tp_dealloc instead of just tp_dealloc):
>
> - tp_dealloc, tp_print, tp_getattr, tp_setattr, tp_repr,
> ?tp_hash, tp_call, tp_str, tp_getattro, tp_setattro,
> ?tp_doc, tp_traverse, tp_clear, tp_richcompare, tp_iter,
> ?tp_iternext, tp_methods, tp_base, tp_descr_set, tp_descr_set,
> ?tp_init, tp_alloc, tp_new, tp_is_gc, tp_bases, tp_del
> - nb_add nb_subtract nb_multiply nb_remainder nb_divmod nb_power
> ?nb_negative nb_positive nb_absolute nb_bool nb_invert nb_lshift
> ?nb_rshift nb_and nb_xor nb_or nb_int nb_float nb_inplace_add
> ?nb_inplace_subtract nb_inplace_multiply nb_inplace_remainder
> ?nb_inplace_power nb_inplace_lshift nb_inplace_rshift nb_inplace_and
> ?nb_inplace_xor nb_inplace_or nb_floor_divide nb_true_divide
> ?nb_inplace_floor_divide nb_inplace_true_divide nb_index
> - sq_length sq_concat sq_repeat sq_item sq_ass_item was_sq_ass_slice
> ?sq_contains sq_inplace_concat sq_inplace_repeat
> - mp_length mp_subscript mp_ass_subscript
> - bf_getbuffer bf_releasebuffer
>
> XXX Not supported yet: tp_weaklistoffset, tp_dictoffset
>
> The following fields cannot be set during type definition:
> - tp_dict tp_mro tp_cache tp_subclasses tp_weaklist
>
> Functions and function-like Macros
> ----------------------------------
>
> All functions starting with _Py are not available to applications.
> Also, all functions that expect parameter types that are unavailable
> to applications are excluded from the ABI, such as PyAST_FromNode
> (which expects a ``node*``).
>
> All other functions are available, unless excluded below.
>
> Function-like macros (in particular, field access macros) remain
> available to applications, but get replaced by function calls
> (unless their definition only refers to features of the ABI, such
> as the various _Check macros)
>
> ABI function declarations will not change their parameters or return
> types. If a change to the signature becomes necessary, a new function
> will be introduced. If the new function is source-compatible (e.g. if
> just the return type changes), an alias macro may get added to
> redirect calls to the new function when the applications is
> recompiled.
>
> If continued provision of the old function is not possible, it may get
> deprecated, then removed, in accordance with PEP 7, causing
> applications that use that function to break.
>
> Excluded Functions
> ------------------
>
> Functions declared in the following header files are not part
> of the ABI:
> - cellobject.h
> - classobject.h
> - code.h
> - frameobject.h
> - funcobject.h
> - genobject.h
> - pyarena.h
> - pydebug.h
> - symtable.h
> - token.h
> - traceback.h
>
> Global Variables
> ----------------
>
> Global variables representing types and exceptions are available
> to applications.
> XXX provide a complete list.
>
> XXX should restrict list of globals to truly "builtin" stuff,
> excluding everything that can also be looked up through imports.
>
> XXX may specify access to predefined types and exceptions through
> the interpreter state, with appropriate Get macros.
>
> Other Macros
> ------------
>
> All macros defining symbolic constants are available to applications;
> the numeric values will not change.
>
> In addition, the following macros are available:
>
> - Py_BEGIN_ALLOW_THREADS, Py_BLOCK_THREADS, Py_UNBLOCK_THREADS,
> ?Py_END_ALLOW_THREADS
>
> Linkage
> -------
>
> On Windows, applications shall link with python3.dll; an import
> library python3.lib will be available. This DLL will redirect all of
> its API functions through /export linker options to the full
> interpreter DLL, i.e. python3y.dll.
>
> XXX is it possible to redirect global variables in the same way?
> If not, python3.dll would have to copy them, and we should verify
> that all available global variables are read-only.
>
> On Unix systems, the ABI is typically provided by the python
> executable itself. PyModule_Create is changed to pass ``3`` as the API
> version if the extension module was compiled with Py_LIMITED_API; the
> version check for the API version will accept either 3 or the current
> PYTHON_API_VERSION as conforming. If Python is compiled as a shared
> library, it is installed as both libpython3.so, and libpython3.y.so;
> applications conforming to this PEP should then link to the former.
>
> XXX is it possible to make the soname libpython.so.3, and still
> have some applications link to libpython3.y.so?
>
> Implementation Strategy
> =======================
>
> This PEP will be implemented in a branch, allowing users to check
> whether their modules conform to the ABI. To simplify this testing, an
> additional macro Py_LIMITED_API_WITH_TYPES will expose the existing
> type object layout, to let users postpone rewriting all types. When
> the this branch is merged into the 3.2 code base, this macro will
> be removed.
>
> Copyright
> =========
>
> This document has been placed in the public domain.
>


From clp2 at rebertia.com  Wed May 20 12:48:43 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 20 May 2009 09:48:43 -0700
Subject: Trying to understand a very simple class - from the book "dive 
	into python"
In-Reply-To: <1960e2d0-4d7b-448a-b701-65f36117059b@d19g2000prh.googlegroups.com>
References: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
	<LNVQl.21081$Ux.11632@tornado.fastwebnet.it>
	<1960e2d0-4d7b-448a-b701-65f36117059b@d19g2000prh.googlegroups.com>
Message-ID: <50697b2c0905200948t113dbefeke24e4e9317f705fe@mail.gmail.com>

On Wed, May 20, 2009 at 9:10 AM, walterbyrd <walterbyrd at iname.com> wrote:
> On May 20, 9:59?am, Marco Mariani <ma... at sferacarta.com> wrote:
>
>> Do you know what a dictionary is?
>
> Yes, but I thought ?a dictionary used curly brackets. Is the object a
> dictionary?

Indeed. Note how you're subclassing `UserDict` (its name is similar to
`dict` for a reason).
See the UserDict docs for more info:
http://docs.python.org/library/userdict.html

Cheers,
Chris
-- 
http://blog.rebertia.com


From bearophileHUGS at lycos.com  Wed May 20 12:53:33 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Wed, 20 May 2009 09:53:33 -0700 (PDT)
Subject: finding repeated data sequences in a column
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>
	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com> 
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
Message-ID: <c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com>

yadin:
> How can I build up a program that tells me that this sequence
> 1000028706
> 1000028707
> 1000028708
> is repeated somewhere in the column, and how can i know where?

Can such patterns nest? That is, can you have a repeated pattern made
of an already seen pattern plus something else?
If you don't want a complex program, then you may need to specify the
problem better.

You may want something like LZ77 or releated (LZ78, etc):
http://en.wikipedia.org/wiki/LZ77
This may have a bug:
http://code.activestate.com/recipes/117226/

Bye,
bearophile


From jdoe at usenetlove.invalid  Wed May 20 13:05:28 2009
From: jdoe at usenetlove.invalid (John Doe)
Date: Wed, 20 May 2009 17:05:28 GMT
Subject: The ultimate in voice-powered scripting in Windows... need help
References: <gQgQl.29479$yr3.25296@nlpi068.nbdc.sbc.com>
Message-ID: <sLWQl.19701$8_3.12828@flpi147.ffdc.sbc.com>


The author provided solutions.
Posted to (comp.lang.beta).


From walterbyrd at iname.com  Wed May 20 13:38:18 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Wed, 20 May 2009 10:38:18 -0700 (PDT)
Subject: When does the escape character work within raw strings?
Message-ID: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>

I know that

s = r'x\nx'

means 'x' followed by a literal '\' followed by an 'n' (the '\n' is
not a carriage return).

s = r'x\tx'

means 'x' followed by a literal '\' followed by an 't' (the '\t' is
not a tab).

But, boundries seem to work differently.

s = re.sub(r'\bxxx\b', 'yyy', s)

Is *not* going to look for a literal '\' followed by 'b'

So I am confused about when escapes work within raw strings, and when
do escapes not work within raw strings.


From aaron.watters at gmail.com  Wed May 20 13:38:41 2009
From: aaron.watters at gmail.com (Aaron Watters)
Date: Wed, 20 May 2009 10:38:41 -0700 (PDT)
Subject: Ann: Nucular full text search 0.5 +boolean queries +unicode fixes
Message-ID: <9143fdf1-b0d0-457a-94fa-d27775f77612@n21g2000vba.googlegroups.com>

Announcing Nucular 0.5

This release adds streamlined interfaces for
boolean queries.  Search for "dogs" or "cats"
but not "smelly" like this:

  dicts = session.dictionaries("(dogs|cats) ~smelly")

Also included are some other features and bug
fixes, including some unicode handling bugfixes.

   HOME: http://nucular.sourceforge.net/
   BOOLEAN QUERIES: http://nucular.sourceforge.net/Boolean.html

About Nucular:

Nucular is a system for creating full text indices
for fielded data.  It can be accessed via a Python API
or via a suite of command line interfaces.

Nucular archives fielded documents and retrieves them
based on field value, field prefix, field word prefix,
or full text word prefix, word proximity or combinations of
these. Nucular also includes features for determining values
related to a query often called query facets.

Features

Nucular is very light weight. Updates and accesses
do not require any server process or other system
support such as shared memory locking.

Nucular supports concurrency. Arbitrary concurrent
updates and accesses by multiple processes or threads
are supported, with no possible locking issues.

Nucular is pure Python.
Nucular indexes and retrieves data quickly.
Nucular has a funny name.

More information about Nucular including links
to documentation, and releases is available at
http://nucular.sourceforge.net

Thanks: Rene Maurer and Matt Chaput and others
for comments, suggestions, patches.

   -- Aaron Watters

===
an apple every 8 hours
will keep 3 doctors away.  -- kliban


From egrefen at gmail.com  Wed May 20 13:43:21 2009
From: egrefen at gmail.com (Edward Grefenstette)
Date: Wed, 20 May 2009 10:43:21 -0700 (PDT)
Subject: LaTeXing python programs
Message-ID: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>

Yes, I am aware that this is more of a LaTeX question than a python
question, but I thought users here might be most likely to offer a
suitable recommendation.

I'm typing up my master's  thesis and will be including some of the
code used for my project in an appendix. The question is thus: is
there a LaTeX package out there that works well for presenting python
code?

verbatim is a bit ugly and doesn't wrap code, and while there are a
plethora of code colouring packages out there, they are not all easy
to use, so I thought I might ask what the popular options in the
community are.

Cheers,
Edward


From namekuseijin at gmail.com  Wed May 20 13:46:38 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Wed, 20 May 2009 14:46:38 -0300
Subject: Performance java vs. python
In-Reply-To: <de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.407.1242754952.8015.python-list@python.org>
	<guv968$2l5j$1@adenine.netfront.net>
	<de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>
Message-ID: <67d0527e0905201046m4a4de0b8u5cc8986affa5a3dd@mail.gmail.com>

On Tue, May 19, 2009 at 7:21 PM, David Stanek <dstanek at dstanek.com> wrote:
> On Tue, May 19, 2009 at 5:43 PM, namekuseijin <namekuseijin at gmail.com> wrote:
>> someone said:
>>>>>>
>>>>>> If you took a look at Java, you would
>>>>>> notice that the core language syntax is much simpler than Python's.
>>
>> thanks for the laughs whoever you are!
>>
>
> I'm no Java fan, but I do agree that the core language is a bit easier
> for people to grasp. I have also heard that from other developers as
> well.

Really?  Core language, eh?

Just take a look at just the summary of the Java language spec:
http://java.sun.com/docs/books/jls/third_edition/html/j3TOC.html

Then compare with the summary for Python 3.0 language reference:
http://docs.python.org/3.0/reference/

Like comparing a mammoth to a zebra.

Besides, how is:
for( int i=0; i<10; i++ )

simpler than:
for i in (range(10))

?

Scripting languages like Python eventually led Java to provide a more
friendly for, which they call, quite appropriately, enhacedFor.
Here's it in action:
for (Map.Entry<String, Integer> e : histogram.entrySet())

in Python:
for e in histogram.items()

fun.

Here's a more complete example, available a bit down from:
http://java.sun.com/docs/books/jls/third_edition/html/statements.html#14.14.2

Map<String, Integer> histogram = ...;
    double total = 0;
    for (int i : histogram.values())
        total += i;
    for (Map.Entry<String, Integer> e : histogram.entrySet())
        System.out.println(e.getKey() + "       " + e.getValue() / total);

in Python:
histogram = ...
total=0
for i in histogram.values():  total+=i
for e in histogram.items():
    print(  e[0] + "     " + str( e[1]/float(total) ))

yeah, surely a friggin' lot more complex... and we didn't even come to
use any of Java's HUUUGE APIs, just the core lang... BTW, I'm amused
that Java's string concatanating doesn't require an explicit cast from
the float result.

anyway, again, thanks for the laughs.


From varguna at gmail.com  Wed May 20 13:53:28 2009
From: varguna at gmail.com (Aytekin Vargun)
Date: Wed, 20 May 2009 13:53:28 -0400
Subject: popen - reading strings - constructing a list from the strings
In-Reply-To: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>
References: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>
Message-ID: <fe9846b90905201053l25fe0ebt47907de64a80eb88@mail.gmail.com>

First of all,
Thanks for the suggestions, MRAB and norseman. "split()" was what I was
looking for. Now I have a follow up question. In my application I create
radio buttons in a frame. These radio buttons are constructed whenever a
button is clicked. Therefore the list of items are dynamically changing.

What I want to do is to remove the current radio buttons and then recreate a
new set of radio buttons using a new string list. I could not see a command
for deleting or removing a set of radio buttons. I use Tkinter.

I can provide more details.
Thanks a lot.

PS: I apologize if this creates a new thread. I am new to the list.
Aytekin


On Wed, May 20, 2009 at 11:17 AM, Aytekin Vargun <varguna at gmail.com> wrote:

> <python-list at python.org>
> Hello everybody,
> I have a question about the way I use os.popen. I am open to other
> alternative suggestions like using subprocess or communicate.
>
> I have an executable (say read_cell_types.exe) that produces string
> outputs. For example, after one execution I got the following outputs in one
> line:
>
> Neurons Microglia Astrocytes
>
> In another execution, there might be different numbers of strings.
>
> What I would like to do is to get these strings after running
> read_cell_types.exe from my python program dynamically  and construct radio
> buttons from the list of strings. In order to do this I need to construct a
> list of strings first as in
>
> ["Neurons" "Microglia" "Astrocytes"]
>
> Then it is easy to construct the radio buttons.
>
> When I use the following code
>
> command = "read_cell_types " + fileName2
> child = os.popen(command)
> data = child.read()
> allObjects=data
>
> allObjects (or data) contains the letters of all string words. I think it
> is probably like ["N" "e" "u" "r"  ...]
>
> How can I construct ["Neurons" "Microglia" "Astrocytes"] instead?
>
> I will really appreciate your help.
> Thanks a lot.
>
> PS: fileName2 is a parameter  that I am passing to read_cell_types.exe
>
> Aytekin
>
> --
> My web page: http://www.cs.rpi.edu/~vargua<http://www.cs.rpi.edu/%7Evargua>
>



-- 
My web page: http://www.cs.rpi.edu/~vargua
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From norseman at hughes.net  Wed May 20 13:53:35 2009
From: norseman at hughes.net (norseman)
Date: Wed, 20 May 2009 10:53:35 -0700
Subject: finding repeated data sequences in a column
In-Reply-To: <c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com>
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
	<c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com>
Message-ID: <4A14439F.1070105@hughes.net>

bearophileHUGS at lycos.com wrote:
> yadin:
>> How can I build up a program that tells me that this sequence
>> 1000028706
>> 1000028707
>> 1000028708
>> is repeated somewhere in the column, and how can i know where?
> 
> Can such patterns nest? That is, can you have a repeated pattern made
> of an already seen pattern plus something else?
> If you don't want a complex program, then you may need to specify the
> problem better.
> 
> You may want something like LZ77 or releated (LZ78, etc):
> http://en.wikipedia.org/wiki/LZ77
> This may have a bug:
> http://code.activestate.com/recipes/117226/
> 
> Bye,
> bearophile
============================================
index on column
Ndx1 is set to index #1
Ndx2 is set to index #2
test Ndx1 against Ndx2
   if equal write line number and column content to a file
           (that's two things on one line:  15 1000028706
                                           283 1000028706 )
   Ndx1 is set to Ndx2
   Ndx2 is set to index #next
loop to test    writing out each duplicate set

Then use the outfile and index on line number

In similar manor, check if line current and next line line numbers are 
sequential.  If so scan forward to match column content of lower line 
number and check first matched column's line number and next for 
sequential.  Print them out if so


everything in outfile has 1 or more duplicates

4  aa               |--
5  bb         |--      |      thus 4/5 match 100/101
6  cc            |     |
.                |     |
100 aa           |  |--
101 bb         |--
102 ddd
103 cc                  there is a duplicate but not a sequence
200 ff

mark duplicate sequences as tested and proceed on through
   seq1 may have more than one other seq in file.
   the progress is from start to finish without looking back
   thus each step forward has fewer lines to test.
   marking already knowns eliminates redundant sequence testing.

By subseting on pass1 the expensive testing is greatly reduced.
If you know your subset data won't exceed memory then the "outfile"
can be held in memory to speed things up considerably.

Today is: 20090520
no code

Steve


From j.reid at mail.cryst.bbk.ac.uk  Wed May 20 13:55:18 2009
From: j.reid at mail.cryst.bbk.ac.uk (John Reid)
Date: Wed, 20 May 2009 18:55:18 +0100
Subject: LaTeXing python programs
In-Reply-To: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
Message-ID: <gv1g66$g7s$1@ger.gmane.org>

Edward Grefenstette wrote:
> I'm typing up my master's  thesis and will be including some of the
> code used for my project in an appendix. The question is thus: is
> there a LaTeX package out there that works well for presenting python
> code?
> 
> verbatim is a bit ugly and doesn't wrap code, and while there are a
> plethora of code colouring packages out there, they are not all easy
> to use, so I thought I might ask what the popular options in the
> community are.

pygments



From tim.arnold at sas.com  Wed May 20 13:57:03 2009
From: tim.arnold at sas.com (Tim Arnold)
Date: Wed, 20 May 2009 13:57:03 -0400
Subject: LaTeXing python programs
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
	<mailman.458.1242842132.8015.python-list@python.org>
Message-ID: <gv1g9f$fug$1@foggy.unx.sas.com>


"John Reid" <j.reid at mail.cryst.bbk.ac.uk> wrote in message 
news:mailman.458.1242842132.8015.python-list at python.org...
> Edward Grefenstette wrote:
>> I'm typing up my master's  thesis and will be including some of the
>> code used for my project in an appendix. The question is thus: is
>> there a LaTeX package out there that works well for presenting python
>> code?
>>
>> verbatim is a bit ugly and doesn't wrap code, and while there are a
>> plethora of code colouring packages out there, they are not all easy
>> to use, so I thought I might ask what the popular options in the
>> community are.
>
> pygments
>
and listings




From google at mrabarnett.plus.com  Wed May 20 14:05:10 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 20 May 2009 19:05:10 +0100
Subject: When does the escape character work within raw strings?
In-Reply-To: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
Message-ID: <4A144656.2040302@mrabarnett.plus.com>

walterbyrd wrote:
> I know that
> 
> s = r'x\nx'
> 
> means 'x' followed by a literal '\' followed by an 'n' (the '\n' is
> not a carriage return).
> 
> s = r'x\tx'
> 
> means 'x' followed by a literal '\' followed by an 't' (the '\t' is
> not a tab).
> 
> But, boundries seem to work differently.
> 
> s = re.sub(r'\bxxx\b', 'yyy', s)
> 
> Is *not* going to look for a literal '\' followed by 'b'
> 
> So I am confused about when escapes work within raw strings, and when
> do escapes not work within raw strings.
 >
The re module receives the regular expression in the form of a string
and then interprets it in its own way.

If you give the re module '\b', that's a backspace character, which is
treated as a literal character, just like 'x'.

If you give it r'\b', that _does_ contain 2 characters, but the re
module interprets it as representing a word boundary, except in a
character set [...] where that would be meaningless, so there it's
interpreted as representing a backspace character.


From jan.plaza at plattsburgh.edu  Wed May 20 14:35:47 2009
From: jan.plaza at plattsburgh.edu (Jan)
Date: Wed, 20 May 2009 11:35:47 -0700 (PDT)
Subject: reseting an iterator
Message-ID: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>

Wouldn't it be easy for Python to implement generating functions so
that the iterators they return are equipped with a __reset__() method?

Here is the context of this question.

Python documentation defines  a "iterator" as an object ITERATOR
having methods __next__() and __iter__() such that the call
ITERATOR.__iter__() returns the object itself, and once a call
ITERATOR. __next__() raises StopIteration every such subsequent call
does the same.

Python iterators model "generating Turing machines", i.e.
deterministic Turing machines which take no input, which have a
separation symbol # in the output alphabet; have an one-way-infinite
output tape on which the output head prints and moves only to the
right; The machine may have a halting state; a word is said to be
"generated by M" if it appears on the output tape delimited by
separation symbols # (independently of whether M halts or computes
infinitely). Generating Turing machines provide a characterization of
recursively enumerable languages: a language is generated by a
generating Turing machine iff it is accepted by a Turing machine.

Turing machines can take as input and run other Turing Machines --
similarly Python functions can take other functions (including
iterators) as parameters and call them. HOWEVER, this symmetry breaks
down: a Turing machine which takes a generating Turing machine M as
input can run M for a number of steps and then RESET M and run it
again, while iterators as currently defined in Python do not have a
reset method. (I realize that instead of reseting an old iterator, one
can make a new iterator but it is not as elegant.)

(Contrary to Python's philosophy that there should be one-- and
preferably only one --obvious way to do it) there are several ways to
define iterators:


From google at mrabarnett.plus.com  Wed May 20 14:39:35 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 20 May 2009 19:39:35 +0100
Subject: popen - reading strings - constructing a list from the strings
In-Reply-To: <fe9846b90905201053l25fe0ebt47907de64a80eb88@mail.gmail.com>
References: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>
	<fe9846b90905201053l25fe0ebt47907de64a80eb88@mail.gmail.com>
Message-ID: <4A144E67.3050003@mrabarnett.plus.com>

Aytekin Vargun wrote:
> First of all,
> Thanks for the suggestions, MRAB and norseman. "split()" was what I was 
> looking for. Now I have a follow up question. In my application I create 
> radio buttons in a frame. These radio buttons are constructed whenever a 
> button is clicked. Therefore the list of items are dynamically changing.
> 
> What I want to do is to remove the current radio buttons and then 
> recreate a new set of radio buttons using a new string list. I could not 
> see a command for deleting or removing a set of radio buttons. I use 
> Tkinter.
> 
> I can provide more details.
> Thanks a lot.
> 
> PS: I apologize if this creates a new thread. I am new to the list.
> Aytekin
> 
I have no idea whether this is possible. I'd just create a new frame. I
hope you're not trying to add and remove buttons on a dialog while it's
open; having a dialog radically change its appearance while the user is
watching would, IMHO, be very bad! :-)


From jaomatos at gmail.com  Wed May 20 14:40:20 2009
From: jaomatos at gmail.com (=?iso-8859-1?q?Jos=E9_Matos?=)
Date: Wed, 20 May 2009 19:40:20 +0100
Subject: LaTeXing python programs
In-Reply-To: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
Message-ID: <200905201940.20971.jaomatos@gmail.com>

On Wednesday 20 May 2009 18:43:21 Edward Grefenstette wrote:
> Yes, I am aware that this is more of a LaTeX question than a python
> question, but I thought users here might be most likely to offer a
> suitable recommendation.
>
> I'm typing up my master's  thesis and will be including some of the
> code used for my project in an appendix. The question is thus: is
> there a LaTeX package out there that works well for presenting python
> code?
>
> verbatim is a bit ugly and doesn't wrap code, and while there are a
> plethora of code colouring packages out there, they are not all easy
> to use, so I thought I might ask what the popular options in the
> community are.

Use the listings package.
It has a python as one of defined languages and has lots of other options.
http://www.ctan.org/tex-archive/macros/latex/contrib/listings/

> Cheers,
> Edward

-- 
Jos? Ab?lio


From jan.plaza at plattsburgh.edu  Wed May 20 14:48:07 2009
From: jan.plaza at plattsburgh.edu (Jan)
Date: Wed, 20 May 2009 11:48:07 -0700 (PDT)
Subject: reseting an iterator
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
Message-ID: <94951545-b334-443a-9f1e-a6822a27cc1f@21g2000vbk.googlegroups.com>

On May 20, 2:35?pm, Jan <jan.pl... at plattsburgh.edu> wrote:

OOPS, I have pressed some keys and the message went out before It was
finished.
Here is the last fragment:

So, one can define iterators by defining a class whose objects have
methods
__iter__ and __next__ -- with this approach it is easy to add some
__reset__
method. But the easiest way to define iterators is by constructing a
generating
function (with yield expressions); this function returns iterators,
although
without __reset__. Another way to define an iterator is to define
callable
and using iter(CALLABLE, SENTINEL) -- the resulting iterator will not
have __reset__.
I do not know how Python is implemented but I believe that
in the last two cases, Python could produce improved iterators with
__reset__
at almost no additional cost.

Jan


From aahz at pythoncraft.com  Wed May 20 14:52:43 2009
From: aahz at pythoncraft.com (Aahz)
Date: 20 May 2009 11:52:43 -0700
Subject: Import and absolute file names, sys.path including ''... or not
References: <mailman.406.1242754524.8015.python-list@python.org>
Message-ID: <gv1jhr$5q3$1@panix3.panix.com>

In article <mailman.406.1242754524.8015.python-list at python.org>,
Jean-Michel Pichavant  <jeanmichel at sequans.com> wrote:
>
>I spent quite a time on a malicious issue. I found out that there is a
>slight difference on the sys.path content when either executing code
>from a shell or from within a script.  This difference is the '' item,
>which is present in the shell form of sys.path.

Why are you calling this a malicious issue?

When I do this test, I find that the current working directory's full
path is prepended to sys.path, so if you're having problems, I bet that
you're changing your working directory during program execution.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From jan.plaza at plattsburgh.edu  Wed May 20 14:58:31 2009
From: jan.plaza at plattsburgh.edu (Jan)
Date: Wed, 20 May 2009 11:58:31 -0700 (PDT)
Subject: reseting an iterator
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
	<94951545-b334-443a-9f1e-a6822a27cc1f@21g2000vbk.googlegroups.com>
Message-ID: <16cfe1a7-9cb8-4ba1-9be1-30607c00f506@r34g2000vba.googlegroups.com>

On May 20, 2:48?pm, Jan <jan.pl... at plattsburgh.edu> wrote:

Iterators can also be produced by iter(ITERABLE) which
could mnufacture them with a __reset__.

Jan




From aisaac at american.edu  Wed May 20 15:20:20 2009
From: aisaac at american.edu (Alan G Isaac)
Date: Wed, 20 May 2009 15:20:20 -0400
Subject: 2d barcode library?
In-Reply-To: <mailman.444.1242829804.8015.python-list@python.org>
References: <0d33db03-cc89-4057-bbc6-5a76dd4b8045@s20g2000vbp.googlegroups.com>
	<mailman.444.1242829804.8015.python-list@python.org>
Message-ID: <i8udnb6VfdtuyonXnZ2dnUVZ_tBi4p2d@rcn.net>

Christian Heimes wrote:
> https://cybernetics.hudora.biz/projects/wiki/huBarcode


Cool.
I have to mention a pure PostScript writer as well:
http://www.terryburton.co.uk/barcodewriter/

Alan Isaac



From aisaac at american.edu  Wed May 20 15:23:39 2009
From: aisaac at american.edu (Alan G Isaac)
Date: Wed, 20 May 2009 15:23:39 -0400
Subject: LaTeXing python programs
In-Reply-To: <mailman.461.1242845176.8015.python-list@python.org>
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
	<mailman.461.1242845176.8015.python-list@python.org>
Message-ID: <i8udnbmVfdskxYnXnZ2dnUVZ_tBi4p2d@rcn.net>

> On Wednesday 20 May 2009 18:43:21 Edward Grefenstette 
> wrote:
>> is there a LaTeX package out there that works well for 
>> presenting python code? 


Jos? Matos wrote:
> Use the listings package. 
> It has a python as one of defined languages and has lots of other options. 
> http://www.ctan.org/tex-archive/macros/latex/contrib/listings/ 


The listings package is great and highly configurable.
Note that you can also input entire files of Python code
or pieces of them based on markers.  Really quite great.

Cheers,
Alan Isaac


From aisaac at american.edu  Wed May 20 15:29:01 2009
From: aisaac at american.edu (Alan G Isaac)
Date: Wed, 20 May 2009 15:29:01 -0400
Subject: reseting an iterator
In-Reply-To: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
Message-ID: <BbGdndsBGrZmxInXnZ2dnUVZ_gZi4p2d@rcn.net>

Jan wrote:
> Wouldn't it be easy for Python to implement generating functions so
> that the iterators they return are equipped with a __reset__() method?

Use ``send``:
http://docs.python.org/whatsnew/2.5.html#pep-342-new-generator-features

Remember, there may be no underlying sequence object for
an iterator, and if you want one in that case, you should build it.

Alan Isaac


From antroy at gmail.com  Wed May 20 15:40:19 2009
From: antroy at gmail.com (Ant)
Date: Wed, 20 May 2009 12:40:19 -0700 (PDT)
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com> 
	<mailman.407.1242754952.8015.python-list@python.org>
	<guv968$2l5j$1@adenine.netfront.net> 
	<de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com> 
	<mailman.455.1242841600.8015.python-list@python.org>
Message-ID: <0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>

On May 20, 6:46?pm, namekuseijin <namekusei... at gmail.com> wrote:
> anyway, again, thanks for the laughs.

I'm a Java developer in my day job, and I use Jython for testing out
ideas and prototyping, due to the way Jython makes writing Java so
much easier... Those examples were spot on - things weren't much
simpler before generics, as you had casting going on everywhere. Not
to mention the nice primitive / object divide to add to the languages
complexity.

And the libraries in Java... Compare cat implementations:

# Python
fh = open("myfile.txt")

for line in fh:
    print line

// Java

...

BufferedReader reader = new BufferedReader(new FileReader
("myfile.txt"));
String line = reader.readLine();
while (line != null) {
    System.out.println(line);
}

...

And that's without all of the class/main method boilerplate or try
catch block required due to checked exceptions.

I've taught both Java and Python, and the latter is far easier to pick
up and run with, from both a syntactic point of view and in the use of
the libraries.




From jeanmichel at sequans.com  Wed May 20 16:01:50 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 20 May 2009 22:01:50 +0200
Subject: Import and absolute file names, sys.path including ''... or not
In-Reply-To: <gv1jhr$5q3$1@panix3.panix.com>
References: <mailman.406.1242754524.8015.python-list@python.org>
	<gv1jhr$5q3$1@panix3.panix.com>
Message-ID: <4A1461AE.1030904@sequans.com>

You are right, but my concern is not the relative path resolution. Let 
me clarify:

/home/jeanmichel/test.py:
"import sys
print sys.path"

 >python.exe test.py
sys.path = ['/home/jeanmichel']
 > from within a python shell:
sys.path = ['']

The unpredictable effect of '' (at least something I did not predict) is 
that it allows absolute path resolution, while '/home/jeanmichel' cannot.
Example :
write a anotherTest.py file:
"
__import__('/home/jeanmichel/test')
"

anotherTest.py will be successfully imported in a python shell ('' + 
'/home/jeanmichel/test.py' is a valid path), but the "python.exe 
anotherTest2.py"  form will fail as it will try for '/home/jeanmichel' 
+'/home/jeanmichel/test.py' which is not a valid path.

So my question is: "why the shell is adding '' when the interpreter is 
adding the full path ?"

Hope I'm not too foggy.

JM

Aahz wrote:
> In article <mailman.406.1242754524.8015.python-list at python.org>,
> Jean-Michel Pichavant  <jeanmichel at sequans.com> wrote:
>   
>> I spent quite a time on a malicious issue. I found out that there is a
>> slight difference on the sys.path content when either executing code
>>     
> >from a shell or from within a script.  This difference is the '' item,
>   
>> which is present in the shell form of sys.path.
>>     
>
> Why are you calling this a malicious issue?
>
> When I do this test, I find that the current working directory's full
> path is prepended to sys.path, so if you're having problems, I bet that
> you're changing your working directory during program execution.
>   



From namekuseijin at gmail.com  Wed May 20 16:04:40 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Wed, 20 May 2009 17:04:40 -0300
Subject: Performance java vs. python
In-Reply-To: <0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.407.1242754952.8015.python-list@python.org>
	<guv968$2l5j$1@adenine.netfront.net>
	<de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>
	<mailman.455.1242841600.8015.python-list@python.org>
	<0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>
Message-ID: <gv1nor$10uu$1@adenine.netfront.net>

Ant escreveu:
> # Python
> fh = open("myfile.txt")
> 
> for line in fh:
>     print line
> 
> // Java
> 
> ...
> 
> BufferedReader reader = new BufferedReader(new FileReader
> ("myfile.txt"));
> String line = reader.readLine();
> while (line != null) {
>     System.out.println(line);
> }
> 
> ...
> 
> And that's without all of the class/main method boilerplate or try
> catch block required due to checked exceptions.

Indeed, and it's so complex and such a manual burden that you even 
forgot a further
line = reader.readLine();

inside your while block.

I find it completely unimaginable that people would even think 
suggesting the idea that Java is simpler.  It's one of the most stupidly 
verbose and cranky languages out there, to the point you can't really do 
anything of relevance without an IDE automatically pumping out lots of 
scaffold code for you.

-- 
a game sig: http://tinyurl.com/d3rxz9


From pavlovevidence at gmail.com  Wed May 20 16:32:59 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 20 May 2009 13:32:59 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com> 
	<a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com> 
	<mailman.449.1242835175.8015.python-list@python.org>
Message-ID: <01076ad2-705b-4aea-9867-d19d4adc6693@m17g2000vbi.googlegroups.com>

On May 20, 8:59?am, Luis Zarrabeitia <ky... at uh.cu> wrote:
> On Monday 18 May 2009 10:31:06 pm Carl Banks wrote:
>
> > Even if you decided to accept the penalty and add locking to
> > refcounts, you still have to be prepared for context switching at any
> > time when writing C code, which means in practice you have to lock any
> > object that's being accessed--that's in addition to the refcount lock.
>
> While I agree that the GIL greatly simplifies things for the interpreter, I
> don't understand this statement. In practice, you should lock all critical
> sections if you expect your code to be used in a multithreading environment.
> That can't be different from what Java, C# or any other languages do,
> including C++. Why is that so expensive in python extensions, that it is used
> as an argument against removing the GIL?

I wasn't really arguing that locking individual objects was a
significant penalty in computer time, only in programmer time.  The
locks on reference counts are what's expensive.

Also, I'm not using it as an argument against removing the GIL.  I
want to remove the GIL.  I'm only pointing out that removing the GIL
is not easy, and once it's removed there is a cost.


Carl Banks


From tjreedy at udel.edu  Wed May 20 16:45:59 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 20 May 2009 16:45:59 -0400
Subject: reseting an iterator
In-Reply-To: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
Message-ID: <gv1q69$muh$1@ger.gmane.org>

Jan wrote:
> Wouldn't it be easy for Python to implement generating functions so
> that the iterators they return are equipped with a __reset__() method?

No.  Such a method would have to poke around in the internals of the 
__next__ function in implementation specific ways.  The values used to 
initialize that function might have changed, so 'reset' would have to be 
carefully defined.

def squares():
   start = int(input("enter starting int:"))
   stop  = int(input("enter stopping int"))
   for i in range(start,stop):
     yield i*i

What does 'reset' mean here?

> Here is the context of this question.
> 
> Python documentation defines  a "iterator" as an object ITERATOR
> having methods __next__() and __iter__() such that the call
> ITERATOR.__iter__() returns the object itself, 

This is so that 'iter(iterator) is iterator', so that functions can take 
either an interable or iterator as an argument and proceed without 
checking which it got.

> and once a call ITERATOR. __next__() raises StopIteration every
 >  such subsequent call does the same.

After returning objects for some number of calls, which might be unbounded.

The protocol is basically one method with defined behavior.  It is 
intentionally minimal so it can be used as the universal within-Python 
object stream protocol.  Multiple ways of getting interators is in line 
with this purpose.

Terry Jan Reedy



From slbentley at gmail.com  Wed May 20 17:08:18 2009
From: slbentley at gmail.com (Scooter)
Date: Wed, 20 May 2009 14:08:18 -0700 (PDT)
Subject: Streaming pdf with URLLib
Message-ID: <04eacd56-5293-4553-bdb3-ad2e8266c6b0@z7g2000vbh.googlegroups.com>

I'm playing around with urllib, and httplib, trying to make something
of a pdf proxy.I have a pdf that lives on an internal web server, and
I would like to be able to stream it to my external server. (this is
just a test for a bigger process. Yes I could just copy the pdf to the
external box). I was playing with URLLib doing something like

#!/usr/bin/python

import urllib

u = urllib.urlopen('https://myinternal.server/pdfs/pdfstreamer.aspx')
print 'Content-type: application/pdf\n\n'
# print 'Content-type: application/x-msdownload; name=\"FileName\"\n
\n'
# print 'Content-Dispostion: attachment; filename=\"FileName\"\r\n\n'

pdfdoc = u.read()
print pdfdoc

Hitting my pdfstreamer.aspx app directly through a browser renders a
pdf just fine. So now I'm attempting to use this python app on an
external webserver, access it as a cgi, to pull the pdf, and then re-
render it, but at that point it just shows me the raw pdf in
the browser.


From j.reid at mail.cryst.bbk.ac.uk  Wed May 20 17:10:52 2009
From: j.reid at mail.cryst.bbk.ac.uk (John Reid)
Date: Wed, 20 May 2009 22:10:52 +0100
Subject: LaTeXing python programs
In-Reply-To: <i8udnbmVfdskxYnXnZ2dnUVZ_tBi4p2d@rcn.net>
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>	<mailman.461.1242845176.8015.python-list@python.org>
	<i8udnbmVfdskxYnXnZ2dnUVZ_tBi4p2d@rcn.net>
Message-ID: <gv1rks$shl$1@ger.gmane.org>


Alan G Isaac wrote:
> The listings package is great and highly configurable.
> Note that you can also input entire files of Python code
> or pieces of them based on markers.  Really quite great.

I tried listings. I believe pygments makes better formatted output (at 
least out of the box).



From mail at timgolden.me.uk  Wed May 20 17:11:58 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 20 May 2009 22:11:58 +0100
Subject: URGENT! Changing IE PAC Settings with Python
In-Reply-To: <5caea3690905200906w1c11bb08yf6068ee831038287@mail.gmail.com>
References: <5caea3690905200906w1c11bb08yf6068ee831038287@mail.gmail.com>
Message-ID: <4A14721E.3030007@timgolden.me.uk>

K-Dawg wrote:
> Thanks for any response.  I am in a crisis where one of our networking guys
> moved where our PAC file is housed.  There was a group policy set in Active
> Directory that set the PAC file location in Internet Explorer to the new
> location.
> 
> However, we have 100 remote centers that have about 3 to 4 machines that are
> not on AD (from before an AD migration).  These machines did not receive the
> update.
> 
> Is there a way I can write a python script to run from my machine to jump
> out to a list


More of a Windows question, really, and depends on the configuration
of network, security etc. Certainly you can use any of the usual
Windows techniques (UNCs, WMI, DCOM etc.) to invoke things on those remote
machines, assuming you have enough network and credentials to get there.

Not clear what your level of expertise is, either at the Windows
or at the Python level, so apols. if suggesting the obvious here.
If you already know what technique you're going to use to push
your file out (say, a copy to a remote unc) then getting Python to
read a list of machines from a file and doing the same to each one
is child's play:

import shutil
for machine in open ("machines.txt"):
  shutil.copyfile ("local.pac", r"\\%s\c$\somewhere\thing.pac" % machine)

If you need to set up credentials for that connection first, you
might want to use the win32net module from the pywin32 extensions
to establish a mapped drive or at least a NULL session with known
credentials.

As a possibility the other way round, if you're able to WMI into
the machines, you could run a command on them to pull the file
in, rather than pushing. Obviously, you've still got to establish
credentials.

I'll stop there, because I might be missing the target altogether.
You'll certainly get help here, but you might want to post to
the python-win32 list which is a bit more specialised.

TJG


From nytrokiss at gmail.com  Wed May 20 17:28:15 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Thu, 21 May 2009 00:28:15 +0300
Subject: URGENT! Changing IE PAC Settings with Python
In-Reply-To: <4A14721E.3030007@timgolden.me.uk>
References: <5caea3690905200906w1c11bb08yf6068ee831038287@mail.gmail.com>
	<4A14721E.3030007@timgolden.me.uk>
Message-ID: <8a6b8e350905201428i5a6e1887h68f11ff23dca4bb9@mail.gmail.com>

HI forwarded it to the Python Win32 list

On Thu, May 21, 2009 at 12:11 AM, Tim Golden <mail at timgolden.me.uk> wrote:

> K-Dawg wrote:
>
>> Thanks for any response.  I am in a crisis where one of our networking
>> guys
>> moved where our PAC file is housed.  There was a group policy set in
>> Active
>> Directory that set the PAC file location in Internet Explorer to the new
>> location.
>>
>> However, we have 100 remote centers that have about 3 to 4 machines that
>> are
>> not on AD (from before an AD migration).  These machines did not receive
>> the
>> update.
>>
>> Is there a way I can write a python script to run from my machine to jump
>> out to a list
>>
>
>
> More of a Windows question, really, and depends on the configuration
> of network, security etc. Certainly you can use any of the usual
> Windows techniques (UNCs, WMI, DCOM etc.) to invoke things on those remote
> machines, assuming you have enough network and credentials to get there.
>
> Not clear what your level of expertise is, either at the Windows
> or at the Python level, so apols. if suggesting the obvious here.
> If you already know what technique you're going to use to push
> your file out (say, a copy to a remote unc) then getting Python to
> read a list of machines from a file and doing the same to each one
> is child's play:
>
> import shutil
> for machine in open ("machines.txt"):
>  shutil.copyfile ("local.pac", r"\\%s\c$\somewhere\thing.pac" % machine)
>
> If you need to set up credentials for that connection first, you
> might want to use the win32net module from the pywin32 extensions
> to establish a mapped drive or at least a NULL session with known
> credentials.
>
> As a possibility the other way round, if you're able to WMI into
> the machines, you could run a command on them to pull the file
> in, rather than pushing. Obviously, you've still got to establish
> credentials.
>
> I'll stop there, because I might be missing the target altogether.
> You'll certainly get help here, but you might want to post to
> the python-win32 list which is a bit more specialised.
>
> TJG
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.goldwatches.com
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From kyrie at uh.cu  Wed May 20 17:38:51 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 20 May 2009 17:38:51 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <01076ad2-705b-4aea-9867-d19d4adc6693@m17g2000vbi.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<01076ad2-705b-4aea-9867-d19d4adc6693@m17g2000vbi.googlegroups.com>
Message-ID: <200905201738.51974.kyrie@uh.cu>

On Wednesday 20 May 2009 04:32:59 pm Carl Banks wrote:
> I wasn't really arguing that locking individual objects was a
> significant penalty in computer time, only in programmer time. ?The
> locks on reference counts are what's expensive.
>
> Also, I'm not using it as an argument against removing the GIL. ?I
> want to remove the GIL. ?I'm only pointing out that removing the GIL
> is not easy, and once it's removed there is a cost.

Ah, allright then. Thanks for the clarification.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From joseph.h.garvin at gmail.com  Wed May 20 17:50:32 2009
From: joseph.h.garvin at gmail.com (Joseph Garvin)
Date: Wed, 20 May 2009 16:50:32 -0500
Subject: optparse question, passing unknown flags to subprocess
Message-ID: <fea8ac9f0905201450y59118ee0i1d5e9063b0af18b8@mail.gmail.com>

I'm working on a python script that takes several command line flags,
currently parsed by hand. I'd like to change the script to parse them
with OptionParser from the optparse module. However, currently the
script invokes a subprocess, and any flags the script doesn't
understand it assumes are meant to be passed to the subprocess. But if
I switch to using OptionParser, any options I haven't added to my
parser will cause an error, instead of it ignoring those and letting
me pass them onto the subprocess.

What's the best/most-pythonic way to handle this? I could subclass
OptionParser and override its exit() and error() methods as suggested
by the docs (http://www.python.org/doc/2.4/lib/optparse-how-optik-handles-errors.html)
and have them do nothing, but there are some errors I probably don't
want to ignore (like if the user tries to pass a string to a known
flag that takes an int).


From adrian_d at eskimo.com  Wed May 20 17:53:39 2009
From: adrian_d at eskimo.com (Adrian Dragulescu)
Date: Wed, 20 May 2009 14:53:39 -0700 (PDT)
Subject: scoping problem with list comprehension // learning Python
Message-ID: <Pine.LNX.4.64.0905201433430.26139@shell.eskimo.com>


I just started to learn python (first posting to the list).

I have a list of dates as strings  that I want to convert to a 
list of datetime objects.  Here is my debugging session from inside a 
method.

(Pdb) formatIndex
'%Y-%m-%d'
(Pdb) [datetime.strptime(i, formatIndex) for i in self.index[0:3]]
*** NameError: global name 'formatIndex' is not defined
(Pdb) [datetime.strptime(i, '%Y-%m-%d') for i in self.index[0:3]]
[datetime.datetime(2007, 1, 3, 0, 0), datetime.datetime(2007, 1, 4, 0, 0), 
datetime.datetime(2007, 1, 5, 0, 0)]
(Pdb)

How come I get an error that formatIndex is not defined? I just show that 
it has value '%Y-%m-%d', in the same method scope.  Not sure why it says 
"global name", as I am in a method.

If I run it as a stand-alone, it works:
   index = ['2007-01-01', '2007-01-02', '2007-01-03']
   formatIndex = '%Y-%m-%d'
   print([datetime.strptime(i, formatIndex) for i in index])

Any suggestions much appreciated.  I'm sure it's something trivial.  I'm 
using Python30.

Adrian


From fetchinson at googlemail.com  Wed May 20 18:04:14 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Wed, 20 May 2009 15:04:14 -0700
Subject: P2P text chat engine
In-Reply-To: <77ij0vF1fckbfU1@mid.uni-berlin.de>
References: <a214fa28-e300-4482-9d97-e7df75461203@v1g2000prd.googlegroups.com>
	<76gn8qF1cliefU1@mid.uni-berlin.de>
	<56382643-36d9-436a-9e55-739e82ade7ee@z5g2000vba.googlegroups.com>
	<77ij0vF1fckbfU1@mid.uni-berlin.de>
Message-ID: <fbe2e2100905201504x16dbcbdeydf0a0eb5f7f6a1c@mail.gmail.com>

>>> > If you have the source code of a p2p text chat engine please send to me
>>>
>>> I found that & a pot of gold under my bed. Care to give me your address
>>> so that I can send it to you?
>>>
>>> SCNR,
>>> Diez
>>
>> Hello, can you sent it to me ?
>> avekir at gmail.com
>> Many thanks!!!
>
> I need a snail-mail address of course, gold isn't really shippable via
> email, you know?

In case the OP doesn't respond can I have the gold? Send certified mail to:

Santa Claus
North Pole

Cheers,
Santa

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From aahz at pythoncraft.com  Wed May 20 18:14:02 2009
From: aahz at pythoncraft.com (Aahz)
Date: 20 May 2009 15:14:02 -0700
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.455.1242841600.8015.python-list@python.org>
	<0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>
	<gv1nor$10uu$1@adenine.netfront.net>
Message-ID: <gv1vba$qfn$1@panix3.panix.com>

In article <gv1nor$10uu$1 at adenine.netfront.net>,
namekuseijin  <namekuseijin at gmail.com> wrote:
>
>I find it completely unimaginable that people would even think 
>suggesting the idea that Java is simpler.  It's one of the most stupidly 
>verbose and cranky languages out there, to the point you can't really do 
>anything of relevance without an IDE automatically pumping out lots of 
>scaffold code for you.

Well, I wouldn't go quite that far; after all, I managed to integrate
BouncyCastle into a Java app without an IDE (or really knowing Java, for
that matter).  But you have a valid point once the excessive generalizing
is removed.  ;-)
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From aahz at pythoncraft.com  Wed May 20 18:16:39 2009
From: aahz at pythoncraft.com (Aahz)
Date: 20 May 2009 15:16:39 -0700
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<ccc126d4-fcd3-470c-bc37-06202c353197@t10g2000vbg.googlegroups.com>
	<a5526602-383a-4b62-9741-55562a87e044@r34g2000vbi.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
Message-ID: <gv1vg7$91r$1@panix3.panix.com>

In article <mailman.449.1242835175.8015.python-list at python.org>,
Luis Zarrabeitia  <kyrie at uh.cu> wrote:
>On Monday 18 May 2009 10:31:06 pm Carl Banks wrote:
>>
>> Even if you decided to accept the penalty and add locking to
>> refcounts, you still have to be prepared for context switching at any
>> time when writing C code, which means in practice you have to lock any
>> object that's being accessed--that's in addition to the refcount lock.
>
>While I agree that the GIL greatly simplifies things for the
>interpreter, I don't understand this statement. In practice, you should
>lock all critical sections if you expect your code to be used in a
>multithreading environment.  That can't be different from what Java, C#
>or any other languages do, including C++. Why is that so expensive in
>python extensions, that it is used as an argument against removing the
>GIL?

Python is intended to be simple/easy to integrate with random C
libraries.  Therefore you have to write explicit code from the C side in
order to drop the GIL.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From egrefen at gmail.com  Wed May 20 18:27:18 2009
From: egrefen at gmail.com (Edward Grefenstette)
Date: Wed, 20 May 2009 15:27:18 -0700 (PDT)
Subject: LaTeXing python programs
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
	<mailman.461.1242845176.8015.python-list@python.org>
	<i8udnbmVfdskxYnXnZ2dnUVZ_tBi4p2d@rcn.net> 
	<mailman.465.1242853870.8015.python-list@python.org>
Message-ID: <bdd7618d-53a4-48f8-bd0d-8a218d766c5a@n21g2000vba.googlegroups.com>

On May 20, 10:10?pm, John Reid <j.r... at mail.cryst.bbk.ac.uk> wrote:
> Alan G Isaac wrote:
> > The listings package is great and highly configurable.
> > Note that you can also input entire files of Python code
> > or pieces of them based on markers. ?Really quite great.
>
> I tried listings. I believe pygments makes better formatted output (at
> least out of the box).

I'm trying to figure out how to use pygments. Are there any good usage
examples out there?

Ed


From robert.kern at gmail.com  Wed May 20 18:31:47 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 20 May 2009 17:31:47 -0500
Subject: optparse question, passing unknown flags to subprocess
In-Reply-To: <fea8ac9f0905201450y59118ee0i1d5e9063b0af18b8@mail.gmail.com>
References: <fea8ac9f0905201450y59118ee0i1d5e9063b0af18b8@mail.gmail.com>
Message-ID: <gv20ck$eoi$1@ger.gmane.org>

On 2009-05-20 16:50, Joseph Garvin wrote:
> I'm working on a python script that takes several command line flags,
> currently parsed by hand. I'd like to change the script to parse them
> with OptionParser from the optparse module. However, currently the
> script invokes a subprocess, and any flags the script doesn't
> understand it assumes are meant to be passed to the subprocess. But if
> I switch to using OptionParser, any options I haven't added to my
> parser will cause an error, instead of it ignoring those and letting
> me pass them onto the subprocess.
>
> What's the best/most-pythonic way to handle this? I could subclass
> OptionParser and override its exit() and error() methods as suggested
> by the docs (http://www.python.org/doc/2.4/lib/optparse-how-optik-handles-errors.html)
> and have them do nothing, but there are some errors I probably don't
> want to ignore (like if the user tries to pass a string to a known
> flag that takes an int).

Does the user specify the subprocess's executable on the command line? E.g. I 
have a script called kernprof.py to run a Python script under the profiler:

   $ kernprof.py [--options-for-kernprof] ./some_script.py [--options-for-script]

I set

     parser.allow_interspersed_args = False

These means that once optparse hits any argument ("./some_script.py" in this 
case; basically, anything that is not an option), it will stop parsing options 
and just include everything else in the args list for you to do with as you please.

However, if you are wrapping a fixed executable and you want to allow the 
options to be all mixed up, I don't have a simple answer for you. You could use 
"--" when you run your script to separate the script's options from the 
arguments, but remembering to do that all of the time can be a pain.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Scott.Daniels at Acm.Org  Wed May 20 18:37:08 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 20 May 2009 15:37:08 -0700
Subject: PYTHONPATH on Windows XP module load problem
In-Reply-To: <gv0gca$tlf$00$1@news.t-online.com>
References: <guubg7$nnk$03$1@news.t-online.com>
	<mailman.390.1242742113.8015.python-list@python.org>
	<guuh3f$47k$00$1@news.t-online.com>
	<SbSdncYZUsrgT4_XnZ2dnUVZ_s2dnZ2d@pdx.net>
	<gv0gca$tlf$00$1@news.t-online.com>
Message-ID: <ybadndVhzcxaGYnXnZ2dnUVZ_t2dnZ2d@pdx.net>

Andreas Otto wrote:
> I have done additional research.
>      1. setup a "setup.py" script
>      2. compiled the extension
>      3. copy the extension to the test directory
>          -> cp ../pymsgque/build/lib.win32-3.0-pydebug/pymsgque.pyd .
This doesn't work.  Windows is beseiged by trojan writers.  Just as the
various shell authors on *ix stopped executing commands from files in
the current directory unless explicitly invoked via './ls' (for
example), on windows care is taken to avoid libraries from "the
current directory."  Normally one solves this with "python setup.py
install," but you could also do look at the places Python searches
for its loadable modules, and putting the copy in one of those places,
choosing (of course) one earlier in the search than the copy you
intend to override.

You want to keep your *ix model, and that just doesn't work (I take
as evidence your use of a "cp" command above).  I suggest you will
keep stubbing your toe on the next thing that doesn't work quite like
*ix.  To port software is not to simulate your favorite operating
system on the target architecture and then run your app there, but
to understand the target environment and work to fit the software
there.  If you aren't going to put in the time to learn that
target environment, just go with "distutils" model.  It will then
at least be easy to make installers for the target system.

So, for example, I build with mingw32, not the full-blown gcc
environment when working on Windows at home.  When at work, it is
my employer's choice what tools I use (Visual C/C++, Intel C/C++ on
Windows usually; more varied on *ix).

--Scott David Daniels
Scott.Daniels at Acm.Org


From kyrie at uh.cu  Wed May 20 19:07:58 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 20 May 2009 19:07:58 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <gv1vg7$91r$1@panix3.panix.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com>
Message-ID: <200905201907.58481.kyrie@uh.cu>

On Wednesday 20 May 2009 06:16:39 pm Aahz wrote:
> >While I agree that the GIL greatly simplifies things for the
> >interpreter, I don't understand this statement. In practice, you should
> >lock all critical sections if you expect your code to be used in a
> >multithreading environment. ?That can't be different from what Java, C#
> >or any other languages do, including C++. Why is that so expensive in
> >python extensions, that it is used as an argument against removing the
> >GIL?
>
> Python is intended to be simple/easy to integrate with random C
> libraries. ?Therefore you have to write explicit code from the C side in
> order to drop the GIL.

Erm, that doesn't really answers the question. If there were no GIL, the C 
code called from python would be just as unsafe as the C code called from C. 
And if "not thread-safe, you take care of the locking" notices are enough for 
the original libraries (and a lot of other languages, and even python 
constructs), the C extension could always grab the locks.

There must be another reason (i.e, the refcounts) to argue _for_ the GIL, 
because this one just seems to be just an attempt to fix unsafe code when 
called from python. And that was my point. Refcounts + interpreter simplicity 
seem to imply the need for a GIL, but to make unsafe code safe without fixing 
said code (or even thinking about it) is a weird goal... specially if it 
became the only reason for a GIL. After all, one could argue for that goal in 
almost all languages.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From seattlehanks at yahoo.com  Wed May 20 19:18:02 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Wed, 20 May 2009 16:18:02 -0700 (PDT)
Subject: from __future__ import absolute_import issue
Message-ID: <1aeb486c-eef8-453c-8d04-fd831a84f8e2@g22g2000pra.googlegroups.com>

New to the group, this is my first post...

It appears that either absolute imports (or my brain) aren't working.
Given a module string.py which is in the same directory as a.py:

#File a.py
from __future__ import absolute_import

import string

print string # Module imported is string.py in current directory, not
standard library module


It imports the string module in the current directory, not the stirng
module defined in the standard library.

I've also noticed (by printing sys.path) that the current directory
seems to always be included as the first element in sys.path, even
when absolute_import is used.

Any help appreciated.


From kw at codebykevin.com  Wed May 20 19:28:31 2009
From: kw at codebykevin.com (Kevin Walzer)
Date: Wed, 20 May 2009 19:28:31 -0400
Subject: IDLE doesn't save preferences
Message-ID: <affdf$4a149220$4275d90a$14761@FUSE.NET>

I'm using IDLE on Mac OS X 10.5.7 (Python 2.6.2) and I'm getting  a 
strange error when I try to save preferences from the configuration dialog:

Exception in Tkinter callback
Traceback (most recent call last):
   File 
"/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/lib-tk/Tkinter.py", 
line 1410, in __call__
return self.func(*args)
   File 
"/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/idlelib/configDialog.py", 
line 1146, in Apply
   self.DeactivateCurrentConfig()
File 
"/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/idlelib/configDialog.py", 
line 1124, in DeactivateCurrentConfig
     winInstances=self.parent.instance_dict.keys()
    File 
"/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/lib-tk/Tkinter.py", 
line 1722, in __getattr__
File 
"/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/lib-tk/Tkinter.py", 
line 1722, in __getattr__
    return getattr(self.tk, attr)
AttributeError: instance_dict

IDLE just hangs and won't save/update my preferences.

Any ideas?
-- 
Kevin Walzer
Code by Kevin
http://www.codebykevin.com


From seattlehanks at yahoo.com  Wed May 20 19:30:18 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Wed, 20 May 2009 16:30:18 -0700 (PDT)
Subject: from __future__ import absolute_import issue
References: <1aeb486c-eef8-453c-8d04-fd831a84f8e2@g22g2000pra.googlegroups.com>
Message-ID: <d425735e-dd9d-4631-b6d6-b00b867cfe4f@x1g2000prh.googlegroups.com>

On May 20, 4:18?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> New to the group, this is my first post...
>
> It appears that either absolute imports (or my brain) aren't working.
> Given a module string.py which is in the same directory as a.py:
>
> #File a.py
> from __future__ import absolute_import
>
> import string
>
> print string # Module imported is string.py in current directory, not
> standard library module
>
> It imports the string module in the current directory, not the stirng
> module defined in the standard library.
>
> I've also noticed (by printing sys.path) that the current directory
> seems to always be included as the first element in sys.path, even
> when absolute_import is used.
>
> Any help appreciated.

I think I figured this out. Just because a module is in a directory
with an __init__.py module it doesn't put it inside the package. For a
module to be in a package, it must be imported through the package. If
it is just executed as a top-level script, or imported (but not
through the package) the module is for all effects not in a package.


From fabiofz at gmail.com  Wed May 20 19:44:53 2009
From: fabiofz at gmail.com (Fabio Zadrozny)
Date: Wed, 20 May 2009 20:44:53 -0300
Subject: Pydev 1.4.6 Released
Message-ID: <cfb578b20905201644n56481c20p68e87cc198b6abd0@mail.gmail.com>

Hi All,

Pydev and Pydev Extensions 1.4.6 have been released

Details on Pydev Extensions: http://www.fabioz.com/pydev
Details on Pydev: http://pydev.sf.net
Details on its development: http://pydev.blogspot.com

Release Highlights in Pydev Extensions:
-----------------------------------------------------------------

* Auto-import for from __future__ import with_statement will add a
'with' token instead of a with_statement token
* Globals browser improved (only for Eclipse 3.3 onwards, older
versions will have the old interface):
      o Can filter with working sets
      o Can match based on module names. E.g.: django.A would match
all the django classes/methods/attributes starting with 'A'


Release Highlights in Pydev 1.4.6:
----------------------------------------------

* Google App Engine: customized setup and management of Google App
Engine projects
* String substitution variables can be used for pythonpath and launch config.
* The interpreter can be referred from a user-editable name
* Submodules shown on import completion (e.g.: from x|<-- request
completion here will show xml, xml.dom, xml.etree, etc)
* os.path added to default forced builtins
* Showing better errors when code-completion fails
* Fixed problem finding definition for java class when the constructor
was referenced.
* Fixed recursion error on Python 3.0 grammar
* Jython debugger - local variables are properly updated
* Multiple forced builtins can be added/removed at once
* Python 2.6 grammar: kwarg after unpacking arg list
* Python 3.0 grammar: star expr on for
* Fixed problem on code-completion when file is not in the workspace
(SystemASTManager cannot be cast to ASTManager)
* Not throwing IllegalCharsetNameEx on illegal encoding declaration
anymore (patch by Radim Kubacki)
* __future__ imports are always added/reorganized as the 1st import in
the module
* Code-completion in Jython recognizes that a method get/setName
should be available as a 'name' property.
* Finding 'objects' for django
* Pydev Package Explorer
      o Added filter for the python nodes
      o Showing configuration errors
      o Showing the interpreter info


What is PyDev?
---------------------------

PyDev is a plugin that enables users to use Eclipse for Python and
Jython development -- making Eclipse a first class Python IDE -- It
comes with many goodies such as code completion, syntax highlighting,
syntax analysis, refactor, debug and many others.


Cheers,

-- 
Fabio Zadrozny
------------------------------------------------------
Software Developer

Aptana
http://aptana.com/python

Pydev Extensions
http://www.fabioz.com/pydev

Pydev - Python Development Enviroment for Eclipse
http://pydev.sf.net
http://pydev.blogspot.com


From pyscripter at gmail.com  Wed May 20 20:07:53 2009
From: pyscripter at gmail.com (PyScripter)
Date: Wed, 20 May 2009 17:07:53 -0700 (PDT)
Subject: Python IDE PyScripter v1.9.9.7 released
Message-ID: <a7831516-2629-4a22-ad60-b6fab1e06326@21g2000vbk.googlegroups.com>

PyScripter version 1.9.9.7 has been released at http://pyscripter.googlecode.com.

PyScripter is a free and open-source Python Integrated Development
Environment (IDE) created with the ambition to become competitive in
functionality with commercial Windows-based IDEs available for other
languages. Being built in a compiled language is rather snappier than
some of the other Python IDEs and provides an extensive blend of
features that make it a productive Python development environment.

This release provides compatibility with Python 3.1.  Also in this
release PyScripter has been given a complete facelift based on an
updated theme engine which supports customizable themes (see
http://code.google.com/p/pyscripter/wiki/Customization).

As usual this release features an assortment of bug fixes and some
speed improvements.  The full history can be found at
http://code.google.com/p/pyscripter/wiki/History.


From mk.fraggod at gmail.com  Wed May 20 20:08:04 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Thu, 21 May 2009 06:08:04 +0600
Subject: Import and absolute file names, sys.path including ''... or not
In-Reply-To: <4A1461AE.1030904@sequans.com>
References: <mailman.406.1242754524.8015.python-list@python.org>
	<gv1jhr$5q3$1@panix3.panix.com> <4A1461AE.1030904@sequans.com>
Message-ID: <20090521060804.04370747@coercion>

On Wed, 20 May 2009 22:01:50 +0200
Jean-Michel Pichavant <jeanmichel at sequans.com> wrote:

> You are right, but my concern is not the relative path resolution. Let 
> me clarify:
> 
> /home/jeanmichel/test.py:
> "import sys
> print sys.path"
> 
>  >python.exe test.py
> sys.path = ['/home/jeanmichel']
>  > from within a python shell:
> sys.path = ['']
> 
> The unpredictable effect of '' (at least something I did not predict) is 
> that it allows absolute path resolution, while '/home/jeanmichel' cannot.
> Example :
> write a anotherTest.py file:
> "
> __import__('/home/jeanmichel/test')
> "

It works for me with py2.6, what version do you have?

> anotherTest.py will be successfully imported in a python shell ('' + 
> '/home/jeanmichel/test.py' is a valid path), but the "python.exe 
> anotherTest2.py"  form will fail as it will try for '/home/jeanmichel' 
> +'/home/jeanmichel/test.py' which is not a valid path.

I believe python uses os.path.join algorithm to combine paths which
discards anything (absolute or not) if absolute path gets appended to
it:
  os.path.join('/some/path', '/home/jeanmichel') == '/home/jeanmichel'

> So my question is: "why the shell is adding '' when the interpreter is 
> adding the full path ?"

Looks like a solid way to construct relative imports to me.

-- 
Mike Kazantsev // fraggod.net
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From steven at REMOVE.THIS.cybersource.com.au  Wed May 20 20:47:47 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 21 May 2009 00:47:47 GMT
Subject: reseting an iterator
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
Message-ID: <pan.2009.05.21.00.47.48@REMOVE.THIS.cybersource.com.au>

On Wed, 20 May 2009 11:35:47 -0700, Jan wrote:

> Wouldn't it be easy for Python to implement generating functions so that
> the iterators they return are equipped with a __reset__() method?

No.

def gen():
    for name in os.listdir('.'):
        yield open(name).read()
        os.remove(name)


How would you "easily" reset this generator so that it returns the same 
values each time?

That's an extreme example, but as a general rule, generators/iterators 
are one-shot: having consumed a value, you can't get it back again 
without re-creating it from scratch, or possibly not even then. Here's a 
less destructive example:

def gen():
    for i in xrange(10):
        yield time.time()



-- 
Steven


From benjamin at python.org  Wed May 20 20:52:57 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Thu, 21 May 2009 00:52:57 +0000 (UTC)
Subject: scoping problem with list comprehension // learning Python
References: <Pine.LNX.4.64.0905201433430.26139@shell.eskimo.com>
Message-ID: <loom.20090521T005056-67@post.gmane.org>

Adrian Dragulescu <adrian_d <at> eskimo.com> writes:

> 
> 
> I just started to learn python (first posting to the list).
> 
> I have a list of dates as strings  that I want to convert to a 
> list of datetime objects.  Here is my debugging session from inside a 
> method.
> 
> (Pdb) formatIndex
> '%Y-%m-%d'
> (Pdb) [datetime.strptime(i, formatIndex) for i in self.index[0:3]]
> *** NameError: global name 'formatIndex' is not defined
> (Pdb) [datetime.strptime(i, '%Y-%m-%d') for i in self.index[0:3]]
> [datetime.datetime(2007, 1, 3, 0, 0), datetime.datetime(2007, 1, 4, 0, 0), 
> datetime.datetime(2007, 1, 5, 0, 0)]
> (Pdb)
> 
> How come I get an error that formatIndex is not defined? I just show that 
> it has value '%Y-%m-%d', in the same method scope.  Not sure why it says 
> "global name", as I am in a method.

List comprehensions are implemented as nested functions. To be able to use
variables from the outer scope, the compiler has to "see" the list comp in the
context of the whole function. Thus, when you generate one dynamically (through
user input), the compiler doesn't correctly make a closure.






From kw at codebykevin.com  Wed May 20 20:56:23 2009
From: kw at codebykevin.com (Kevin Walzer)
Date: Wed, 20 May 2009 20:56:23 -0400
Subject: IDLE doesn't save preferences
In-Reply-To: <affdf$4a149220$4275d90a$14761@FUSE.NET>
References: <affdf$4a149220$4275d90a$14761@FUSE.NET>
Message-ID: <cee74$4a14a6b7$4275d90a$31817@FUSE.NET>

Kevin Walzer wrote:
> I'm using IDLE on Mac OS X 10.5.7 (Python 2.6.2) and I'm getting  a 
> strange error when I try to save preferences from the configuration dialog:
> 
> Exception in Tkinter callback
> Traceback (most recent call last):
>   File 
> "/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/lib-tk/Tkinter.py", 
> line 1410, in __call__
> return self.func(*args)
>   File 
> "/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/idlelib/configDialog.py", 
> line 1146, in Apply
>   self.DeactivateCurrentConfig()
> File 
> "/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/idlelib/configDialog.py", 
> line 1124, in DeactivateCurrentConfig
>     winInstances=self.parent.instance_dict.keys()
>    File 
> "/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/lib-tk/Tkinter.py", 
> line 1722, in __getattr__
> File 
> "/Library/Frameworks/Python64.framework/Versions/2.6/lib/python2.6/lib-tk/Tkinter.py", 
> line 1722, in __getattr__
>    return getattr(self.tk, attr)
> AttributeError: instance_dict
> 
> IDLE just hangs and won't save/update my preferences.
> 
> Any ideas?

Found a fix here:

http://bugs.python.org/issue5232

& uploaded patch here:

http://bugs.python.org/issue6075


-- 
Kevin Walzer
Code by Kevin
http://www.codebykevin.com


From belred at gmail.com  Wed May 20 21:14:03 2009
From: belred at gmail.com (belred)
Date: Wed, 20 May 2009 18:14:03 -0700 (PDT)
Subject: u'\N{dollar sign}'
Message-ID: <862195cd-8e90-4b0d-a944-05dc21858bab@b7g2000pre.googlegroups.com>

i can't for the life of me figure out where the unicode \N specifier
is located in the python documentation (2.6).  can anyone point me to
the page in the docs?

thanks,

bryan


From bluefisher80 at gmail.com  Wed May 20 21:21:35 2009
From: bluefisher80 at gmail.com (Jim Qiu)
Date: Thu, 21 May 2009 09:21:35 +0800
Subject: Yet another question about class property.
In-Reply-To: <4A13D4B4.3030809@ieee.org>
References: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>
	<4A13D4B4.3030809@ieee.org>
Message-ID: <b42c5a480905201821x22d815c1ic1f92631baded3c5@mail.gmail.com>

Thanks for you patience, Dave.
Obviously i have not got used to the python philosophy.

Following you guide, i implemented the following code, and you are
absolutely right.

#!/usr/bin/python
#coding:utf-8

class Parent(object):

def __init__(self):
pass

def displayAttrOfSubClass(self):
print self.attrFromChild

class Child(Parent):
def __init__(self):
self.attrFromChild = 'Hi, Everyone, Java does this support this trick!'


childObj = Child()
childObj.displayAttrOfSubClass()


Python can use in the parent class a variable only instantiated by a
sub-class, is this a point of advance of technique of Python?

Jim















On Wed, May 20, 2009 at 6:00 PM, Dave Angel <davea at ieee.org> wrote:

> Jim Qiu wrote:
>
>> Hi everyone,
>>
>> Following is the code i am reading, i don't see anywhere the declaration
>> of
>> Message.root object,
>> Where is it from?
>>
>> #bots-modules
>> import bots.botslib as botslib
>> import bots.node as node
>> from bots.botsconfig import *
>>
>>
>> class Message(object):
>>    ''' abstract class; represents a edi message.
>>        is subclassed as outmessage or inmessage object.
>>    '''
>>    def __init__(self):
>>        self.recordnumber=0                #segment counter. Is not used
>> for
>> UNT of SE record; some editypes want sequential recordnumbering
>>
>>    @staticmethod
>>    def display(records):
>>        '''for debugging lexed records.'''
>>        for record in records:
>>            t = 0
>>            for veld in record:
>>                if t==0:
>>                    print '%s    (Record-id)'%(veld[VALUE])
>>                else:
>>                    if veld[SFIELD]:
>>                        print '        %s    (sub)'%(veld[VALUE])
>>                    else:
>>                        print '    %s    (veld)'%(veld[VALUE])
>>                t += 1
>>
>>    def get(self,*mpaths):
>>        ''' query tree (self.root) with mpath; get value (string); get None
>> if not found.'''
>>        if self.root.record is None:
>>            raise botslib.MpathRootError('get("%s"): "root" of incoming
>> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>>        return self.root.get(*mpaths)
>>
>>    def getnozero(self,*mpaths):
>>        ''' like get, returns None is value is zero (0) or not numeric.
>>            Is sometimes usefull in mapping.'''
>>        if self.root.record is None:
>>            raise botslib.MpathRootError('get("%s"): "root" of incoming
>> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>>        return self.root.getnozero(*mpaths)
>>
>>    def getindicator(self,ind,*mpaths):
>>        ''' like get, returns None is value is zero (0) or not numeric.
>>            Is sometimes usefull in mapping.'''
>>        if self.root.record is None:
>>            raise botslib.MpathRootError('get("%s"): "root" of incoming
>> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>>        return self.root.getindicator(ind,*mpaths)
>>
>>    def getcount(self):
>>        ''' count number of nodes in self.root. Number of nodes is number
>> of
>> records.'''
>>        return self.root.getcount()
>>
>>    def getcountoccurrences(self,*mpaths):
>>        ''' count number of nodes in self.root. Number of nodes is number
>> of
>> records.'''
>>        count = 0
>>        for value in self.getloop(*mpaths):
>>            count += 1
>>        return count
>>
>>    def getcountsum(self,*mpaths):
>>        ''' return the sum for all values found in mpath. Eg total number
>> of
>> ordered quantities.'''
>>        if self.root.record is None:
>>            raise botslib.MpathRootError('get("%s"): "root" of incoming
>> message is empty; either split messages or use inn.getloop'%(str(mpaths)))
>>        return self.root.getcountsum(*mpaths)
>>
>>    def getloop(self,*mpaths):
>>        ''' query tree with mpath; generates all the nodes. Is typically
>> used as: for record in inn.get(mpath):
>>        '''
>>        if self.root.record:    #self.root is a real root
>>            for terug in self.root.getloop(*mpaths): #search recursive for
>> rest of mpaths
>>                yield terug
>>        else:   #self.root is dummy root
>>            for childnode in self.root.children:
>>                for terug in childnode.getloop(*mpaths): #search recursive
>> for rest of mpaths
>>                    yield terug
>>
>>    def put(self,*mpaths):
>>        if self.root.record is None and self.root.children:
>>            raise botslib.MpathRootError('put("%s"): "root" of outgoing
>> message is empty; use out.putloop'%(str(mpaths)))
>>        return self.root.put(*mpaths)
>>
>>    def putloop(self,*mpaths):
>>        if not self.root.record:    #no input yet, and start with a
>> putloop(): dummy root
>>            if len(mpaths) == 1:
>>                self.root.append(node.Node(mpaths[0]))
>>                return self.root.children[-1]
>>            else: #TODO: what if self.root.record is None and len(mpaths) >
>> 1?
>>                raise botslib.MpathRootError('putloop("%s"): mpath too
>> long???'%(str(mpaths)))
>>        return self.root.putloop(*mpaths)
>>
>>    def sort(self,*mpaths):
>>        if self.root.record is None:
>>            raise botslib.MpathRootError('get("%s"): "root" of message is
>> empty; either split messages or use inn.getloop'%(str(mpaths)))
>>        self.root.sort(*mpaths)
>>
>>    def normalisetree(self,node):
>>        ''' The node tree is check, sorted, fields are formated etc.
>>            Always use this method before writing output.
>>        '''
>>        #~ node.display()
>>        #~ print 'normalisetree'
>>        self._checktree(node,self.defmessage.structure[0])
>>        self._canonicaltree(node,self.defmessage.structure[0])
>>
>>    def _checktree(self,tree,structure):
>>        ''' checks tree with table:
>>            -   all records should be in table at the right place in
>> hierarchy
>>            -   for each record, all fields should be in grammar
>>            This function checks the root of grammar-structure with root of
>> node tree
>>        '''
>>        if tree.record['BOTSID'] == structure[ID]:
>>            #check tree recursively with structure
>>            self._checktreecore(tree,structure)
>>        else:
>>            raise botslib.MessageError('(Root)record %s of %s not in table
>> %s'%(tree.record['BOTSID'],tree.record,self.defmessage.grammarname))
>>
>>    def _checktreecore(self,node,structure):
>>        ''' recursive
>>        '''
>>        deletelist=[]
>>        self._checkfields(node.record,structure)
>>        if node.children and not LEVEL in structure:
>>            if self.ta_info['checkunknownentities']:
>>                raise botslib.MessageError('Record "%s" in message has
>> children, but structure of grammar "%s" not. Found gg
>>
>> "%s".'%(node.record['BOTSID'],self.defmessage.grammarname,node.children[0].record['BOTSID']))
>>            node.children=[]
>>            return
>>        for childnode in node.children:          #for every node:
>>            for structure_record in structure[LEVEL]:           #search in
>> grammar-records
>>                if childnode.record['BOTSID'] == structure_record[ID]:
>> #if
>> found right structure_record
>>                    #check children recursive
>>                    self._checktreecore(childnode,structure_record)
>>                    break    #check next mpathnode
>>            else:   #checked all structure_record in grammar, but nothing
>> found
>>                if self.ta_info['checkunknownentities']:
>>                    raise botslib.MessageError('Record "%s" in message not
>> in structure of grammar "%s". Whole record:
>>
>> "%s".'%(childnode.record['BOTSID'],self.defmessage.grammarname,childnode.record))
>>                deletelist.append(childnode)
>>        for child in deletelist:
>>            node.children.remove(child)
>>
>>
>>    def _checkfields(self,record,structure_record):
>>        ''' checks for every field in record if field exists in
>> structure_record (from grammar).
>>        '''
>>        deletelist=[]
>>        for field in record.keys():          #all fields in record should
>> exist in structure_record
>>            for grammarfield in structure_record[FIELDS]:
>>                if grammarfield[ISFIELD]:    #if field (no composite)
>>                    if field == grammarfield[ID]:
>>                        break
>>                else:   #if composite
>>                    for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
>> subfields
>>                        if field == grammarsubfield[ID]:
>>                            break
>>                    else:
>>                        continue
>>                    break
>>            else:
>>                if self.ta_info['checkunknownentities']:
>>                    raise botslib.MessageError('Field "%s" does not exist
>> in
>> record: %s'%(field,structure_record[MPATH]))
>>                    #~ raise botslib.MessageError('Field "%s" does not
>> exist
>> in record: %s'%(field,structure_record[ID]))       #alt voor MPATH
>>                    #~ raise botslib.MessageError('Field "%s" does not
>> exist
>> in record: %s'%(field,structure_record[FIELDS]))   #folder, text is too
>> long
>>                deletelist.append(field)
>>        for field in deletelist:
>>            del record[field]
>>
>>    def _canonicaltree(self,node,structure,headerrecordnumber=0):
>>        ''' For nodes: check min and max occurence; sort the nodes conform
>> grammar
>>            For fields: check M/C; format the fields.
>>        '''
>>        sortednodelist = []
>>        self._canonicalfields(node.record,structure,headerrecordnumber)
>>  #write the fields
>>        if LEVEL in structure:
>>            for structure_record in structure[LEVEL]:  #for
>> structure_record
>> of this level in grammar
>>                count = 0                           #count number of
>> occurences of record
>>                for childnode in node.children:            #for every node
>> in mpathtree; SPEED: delete nodes from list when found
>>                    if childnode.record['BOTSID'] != structure_record[ID]:
>> #if it is not the right NODE":
>>                        continue
>>                    count += 1
>>
>>  self._canonicaltree(childnode,structure_record,self.recordnumber)
>> #use rest of index in deeper level
>>                    sortednodelist.append(childnode)
>>                if structure_record[MIN] > count:
>>                    raise botslib.MessageError('Record "%s": mandatory but
>> not present.'%(structure_record[MPATH]))
>>                if structure_record[MAX] < count:
>>                    raise botslib.MessageError('Record "%s": occures to
>> often (%s times).'%(structure_record[MPATH],count))
>>            node.children=sortednodelist
>>            if hasattr(self,'do_queries'):
>>                self.do_queries(node,structure)
>>
>>    def
>> _canonicalfields(self,noderecord,structure_record,headerrecordnumber):
>>        ''' For fields: check M/C; format the fields. Field are not sorted
>> here (a dict can not be sorted)
>>        '''
>>        #~ print noderecord
>>        for grammarfield in structure_record[FIELDS]:
>>            if grammarfield[ISFIELD]:    #if field (no composite)
>>                value = noderecord.get(grammarfield[ID],'')
>>                #~ print 'check field',grammarfield,value
>>                if not value:
>>                    if grammarfield[MANDATORY] == 'M':
>>                        raise botslib.MessageError('Record "%s": mandatory
>> field "%s" not filled.'%(structure_record[MPATH],grammarfield[ID]))
>>                    elif not grammarfield[MINLENGTH]:   #if minlength=0
>>                        continue
>>                noderecord[grammarfield[ID]] =
>> self._formatfield(value,grammarfield,structure_record)
>>            else:               #if composite
>>                compositefilled = False
>>                for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
>> subfields to see if one of them is there
>>                    if noderecord.get(grammarsubfield[ID],''):
>>                        compositefilled = True
>>                if not compositefilled:
>>                    if grammarfield[MANDATORY]=='M':
>>                        raise botslib.MessageError('Record "%s": mandatory
>> composite "%s" not filled.'%(structure_record[MPATH],grammarfield[ID]))
>>                    continue
>>                for grammarsubfield in grammarfield[SUBFIELDS]:   #loop
>> subfields
>>                    value = noderecord.get(grammarsubfield[ID],'')
>>                    #~ print 'check subfield',grammarsubfield,value
>>                    if not value:
>>                        if grammarsubfield[MANDATORY]=='M':
>>                            #~ print 'Record "%s": mandatory subfield "%s"
>> not filled:
>> "%s".'%(structure_record[MPATH],grammarsubfield[ID],noderecord)
>>                            raise botslib.MessageError('Record "%s":
>> mandatory subfield "%s" not filled:
>> "%s".'%(structure_record[MPATH],grammarsubfield[ID],noderecord))
>>                        else:
>>                            continue
>>                    noderecord[grammarsubfield[ID]] =
>> self._formatfield(value,grammarsubfield,structure_record)
>>                    #~ print 'fill',grammarfield[ID]
>>
>> Thanks in advance.
>>
>> Jim
>>
>>
>>
> Unlike your previous question, this attribute is not referenced in
> __init__().  That, plus the comment about being an abstract class, leads me
> to guess that the derived classes are required to define this attribute.
>  That's one of the characteristics of an abstract class;  some of the
> details are missing, and intended to be supplied by a child class.
>
> What do the docs for this abstract class say?  If they don't discuss how to
> implement a concrete class, they're sadly lacking.
>
>
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From pavlovevidence at gmail.com  Wed May 20 21:26:20 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 20 May 2009 18:26:20 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com> 
	<mailman.472.1242860891.8015.python-list@python.org>
Message-ID: <a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>

On May 20, 4:07?pm, Luis Zarrabeitia <ky... at uh.cu> wrote:
> On Wednesday 20 May 2009 06:16:39 pm Aahz wrote:
>
> > >While I agree that the GIL greatly simplifies things for the
> > >interpreter, I don't understand this statement. In practice, you should
> > >lock all critical sections if you expect your code to be used in a
> > >multithreading environment. ?That can't be different from what Java, C#
> > >or any other languages do, including C++. Why is that so expensive in
> > >python extensions, that it is used as an argument against removing the
> > >GIL?
>
> > Python is intended to be simple/easy to integrate with random C
> > libraries. ?Therefore you have to write explicit code from the C side in
> > order to drop the GIL.
>
> Erm, that doesn't really answers the question. If there were no GIL, the C
> code called from python would be just as unsafe as the C code called from C.
> And if "not thread-safe, you take care of the locking" notices are enough for
> the original libraries (and a lot of other languages, and even python
> constructs), the C extension could always grab the locks.

The designers of Python made a design decision(**) that extension
writers would not have to take care of locking.  They could have made
a different decision, they just didn't.


> There must be another reason (i.e, the refcounts) to argue _for_ the GIL,

Why?


> because this one just seems to be just an attempt to fix unsafe code when
> called from python.

I think you are being unfair in calling it unsafe.

Suppose if I were to call PyList_Append from a C extension.  It's not
necessary for me to guard the list I'm calling it on with a lock,
because only the GIL thread is allowed to call most Python API or
otherwise access objects.  But you seem to be suggesting that since I
didn't guard the list with a lock it is "unsafe", even though the GIL
is sufficient?

No, I totally disagree.  The code is not "unsafe" and the GIL doesn't
"fix" it.  The code is jsut


> And that was my point. Refcounts + interpreter simplicity
> seem to imply the need for a GIL, but to make unsafe code safe without fixing
> said code (or even thinking about it) is a weird goal...

Why?  Do you seriously not see the benefit of simplifying the work of
extention writers and core maintainers?  You don't have to agree that
it's a good trade-off but it's a perfectly reasonable goal.

I highly suspect Aahz here would argue for a GIL even without the
refcount issue, and even though I wouldn't agree, there's nothing
weird or unreasonable about the argument, it's just a different
viewpoint.


> specially if it
> became the only reason for a GIL. After all, one could argue for that goal in
> almost all languages.

"B-B-B-But other languages do it that way!" is not a big factor in
language decisions in Python.


Carl Banks

(**) - To be fair, Python didn't originally support threads, so there
was a lot of code that would have become unsafe had threading been
added without the GIL, and that probably influenced the decision to
use a GIL, but I'm sure that wasn't only reason.  Would Python have a
GIL if threading had been there from the start?  Who knows.


From kochhar.mw at gmail.com  Wed May 20 21:42:38 2009
From: kochhar.mw at gmail.com (shailesh)
Date: Wed, 20 May 2009 18:42:38 -0700 (PDT)
Subject: Wrapping methods of built-in dict
Message-ID: <c60e66f1-0bb0-45e6-951f-c8909df7ea11@w35g2000prg.googlegroups.com>

Hello,

I'm trying to write a class decorator which takes a function as an
argument and wraps instancemethods of the class with the function.

After reading a few examples on ActiveState and this blog post <http://
wordaligned.org/articles/echo>, my first attempt goes something like
this:

def tracing_wrapper(fn):
    import functools
    @functools.wraps(fn)
    def wrapped(*args, **kwargs):
        print "invoking %s(%s, %s)" % (fn.__name__, args, kwargs)
        return fn(*args, **kwargs)
    return wrapped

def factory(wrapper_fn):
    def class_wrapper(klass):
        import inspect
        for _, method in inspect.getmembers(klass, inspect.ismethod):
            setattr(klass, method.__name__, wrapper_fn(method))

        for _, fn in inspect.getmembers(klass, inspect.isfunction):
            setattr(klass, fn.__name__, staticmethod(wrapper_fn(fn)))

        return klass
    return class_wrapper

@factory(tracing_wrapper)
class MyObject(object):
    def a(self):
        print "a"

@factory(tracing_wrapper)
class MyDict(dict):
    pass

>>> a = MyObject()
>>> a.a()
invoking a((<__main__.MyObject object at 0xb7bb5bcc>,), {})
a

Naturally, when wrapping the built-in dict type, I don't get the
expected results.
>>> md = MyDict()
>>> md['hello'] = 1
>>> md.get('hello')
1

The reason as far as I understand is that the methods on the built-in
dict are not of MethodType or FunctionType so they are not included in
the result of the inspect.getmembers call and are not wrapped.

Here I'm stuck, unsure how to fix this. Could anyone suggest a way to
wrap the methods of the built-in types? This recipe <http://
code.activestate.com/recipes/252151/> for generalized proxies seems
promising, but I'm not sure how to adapt it for use here.

Thanks in advance.


From sjmachin at lexicon.net  Wed May 20 21:45:35 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 20 May 2009 18:45:35 -0700 (PDT)
Subject: u'\N{dollar sign}'
References: <862195cd-8e90-4b0d-a944-05dc21858bab@b7g2000pre.googlegroups.com>
Message-ID: <a1dd367e-c5be-419f-a7a6-baea59f65f39@c18g2000prh.googlegroups.com>

On May 21, 11:14?am, belred <bel... at gmail.com> wrote:
> i can't for the life of me figure out where the unicode \N specifier
> is located in the python documentation (2.6). ?can anyone point me to
> the page in the docs?

http://docs.python.org/reference/lexical_analysis.html#string-literals


From steven at REMOVE.THIS.cybersource.com.au  Wed May 20 22:31:29 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 21 May 2009 02:31:29 GMT
Subject: Wrapping methods of built-in dict
References: <c60e66f1-0bb0-45e6-951f-c8909df7ea11@w35g2000prg.googlegroups.com>
Message-ID: <pan.2009.05.21.02.31.28@REMOVE.THIS.cybersource.com.au>

On Wed, 20 May 2009 18:42:38 -0700, shailesh wrote:

> The reason as far as I understand is that the methods on the built-in
> dict are not of MethodType or FunctionType 


That seems to be true:

>>> type({}.get)
<type 'builtin_function_or_method'>
>>> type(dict.get)
<type 'method_descriptor'>


> so they are not included in
> the result of the inspect.getmembers call and are not wrapped.

But that isn't:

>>> zip(*inspect.getmembers(dict))[0]  # extract the names only
('__class__', '__cmp__', '__contains__', '__delattr__', '__delitem__', 
'__doc__', '__eq__', '__ge__', '__getattribute__', '__getitem__', 
'__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__', 
'__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', 
'__setattr__', '__setitem__', '__str__', 'clear', 'copy', 'fromkeys', 
'get', 'has_key', 'items', 'iteritems', 'iterkeys', 'itervalues', 'keys', 
'pop', 'popitem', 'setdefault', 'update', 'values')


So the problem isn't directly with getmembers, but with the predicate 
functions you have passed to it (inspect.isfunction and inspect.method). 
Try inspect.ismethoddescriptor instead.


Hint: dir(inspect) and help(inspect.whatever) are useful :)



-- 
Steven


From ivlenin at gmail.com  Wed May 20 23:01:23 2009
From: ivlenin at gmail.com (I V)
Date: 21 May 2009 05:01:23 +0200
Subject: Wrapping methods of built-in dict
References: <c60e66f1-0bb0-45e6-951f-c8909df7ea11@w35g2000prg.googlegroups.com>
	<pan.2009.05.21.02.31.28@REMOVE.THIS.cybersource.com.au>
Message-ID: <4a14c403$1@news.x-privat.org>

On Thu, 21 May 2009 02:31:29 +0000, Steven D'Aprano wrote:
> So the problem isn't directly with getmembers, but with the predicate
> functions you have passed to it (inspect.isfunction and inspect.method).
> Try inspect.ismethoddescriptor instead.

Or perhaps callable ? callable({}.get) and callable(dict.get) are both 
true, although I don't know if that's guaranteed (I'm wondering if 
methods could be implemented with an object such that 
method_object.__get__ returned a callable, but where method_object itself 
wasn't callable).


From mk.fraggod at gmail.com  Wed May 20 23:04:11 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Thu, 21 May 2009 09:04:11 +0600
Subject: How to get Form values in Python code and Send Email
In-Reply-To: <8ca278430905200519p7f4e2d10i6ec79b7d75d6dba8@mail.gmail.com>
References: <8ca278430905192252g67008d31qcd1da318674e30e1@mail.gmail.com>
	<8a6b8e350905200436s6a31c8dap96d6fededa451b3@mail.gmail.com>
	<8ca278430905200519p7f4e2d10i6ec79b7d75d6dba8@mail.gmail.com>
Message-ID: <20090521090411.1848e802@malediction>

On Wed, 20 May 2009 17:49:47 +0530
Kalyan Chakravarthy <kalyanchakravarthy at hyit.com> wrote:

> Hi
>     Now i can able to get the form details in to python code,
> 
> can any one tell me the format to send form values to one Emil
> id   ...  for this  I required SMTP set up?

You can use email and smtplib modules for that along with any SMTP
relay you have access to, even if it requires authentication - smtplib
has support for that.

Following example doesn't uses authentication for SMTP so you might want
to add it or you can indeed set up some SMTP on local machine (there
are really simple ones like ssmtp or msmtp, that can relay mail to
auth-enabled host).


  import smtplib
  from email.MIMEMultipart import MIMEMultipart
  from email.MIMEBase import MIMEBase
  from email.MIMEText import MIMEText
  from email.Utils import COMMASPACE, formatdate
  from email import Encoders
  import os, collections

  def send(to, subj, body, files=[], from=None, relay='localhost'):
    if not isinstance(to, collections.Iterable): to = (to,)

    msg = MIMEMultipart()
    msg['From'] = from
    msg['To'] = COMMASPACE.join(to)
    msg['Date'] = formatdate(localtime=True)
    msg['Subject'] = subj

    msg.attach( MIMEText(body) )

    for file in files:
      part = MIMEBase('application', "octet-stream")
      part.set_payload( open(file,"rb").read() )
      Encoders.encode_base64(part)
      part.add_header('Content-Disposition', 'attachment;
    filename="%s"'% os.path.basename(file)) msg.attach(part)

    smtp = smtplib.SMTP(relay)
    smtp.sendmail(from, to, msg.as_string() )
    smtp.close()



-- 
Mike Kazantsev // fraggod.net
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From kyrie at uh.cu  Wed May 20 23:10:29 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Wed, 20 May 2009 23:10:29 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com>
	<mailman.472.1242860891.8015.python-list@python.org>
	<a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
Message-ID: <1242875429.4a14c625a1eea@mail.uh.cu>


Quoting Carl Banks <pavlovevidence at gmail.com>:

> On May 20, 4:07?pm, Luis Zarrabeitia <ky... at uh.cu> wrote:
> > On Wednesday 20 May 2009 06:16:39 pm Aahz wrote:
> 
> The designers of Python made a design decision(**) that extension
> writers would not have to take care of locking.  They could have made
> a different decision, they just didn't.

Well, then, maybe that's the only python's decision so far I may not agree with.
And I'm not criticizing it... but I'm questioning it, because I honestly don't
understand it.

> > There must be another reason (i.e, the refcounts) to argue _for_ the GIL,
> 
> Why?

1- refcounts is a _very_ strong reason to argue for the GIL. Add to that
simplifying CPython implementation, and you don't really need another one on top
of that, at least not to convince me, but
2- in [almost] every other language, _you_ have to be aware of the critical
sections when multithreading. Even in pure python, you have use locks. Don't you
find at least a bit odd the argument that in the particular case you are writing
a C extension from python, you should be relieved of the burden of locking?

> > because this one just seems to be just an attempt to fix unsafe code when
> > called from python.
> 
> I think you are being unfair in calling it unsafe.

I think I was unfair calling it a "fix". It sounds like it was broken, my bad. I
should have used 'not multithread-ready'.

> Suppose if I were to call PyList_Append from a C extension.  It's not
> necessary for me to guard the list I'm calling it on with a lock,
> because only the GIL thread is allowed to call most Python API or
> otherwise access objects.  But you seem to be suggesting that since I
> didn't guard the list with a lock it is "unsafe", even though the GIL
> is sufficient?

Certainly not. If you program under the assumption that you have a GIL, of
course it is not unsafe. Not your code, anyway. But, why is PyList_Append not
multithread-ready? (or rather, why does PyList_Append would requiere a _global_
lock to be multithread ready, instead of a more local lock?) Of course, given
that the GIL exists, to use it is the easier solution, but for this particular
case, it feels like discarding multithreading just to avoid locking.

> No, I totally disagree.  The code is not "unsafe" and the GIL doesn't
> "fix" it.  The code is jsut

[I think there was a word missing from that sentence...)

> > And that was my point. Refcounts + interpreter simplicity
> > seem to imply the need for a GIL, but to make unsafe code safe without
> fixing
> > said code (or even thinking about it) is a weird goal...
> 
> Why?  Do you seriously not see the benefit of simplifying the work of
> extention writers and core maintainers?  You don't have to agree that
> it's a good trade-off but it's a perfectly reasonable goal.

I do agree that, at least for the core maintainers, it is a good trade-off and a
reasonable goal to keep CPython simple. And if that has, as a positive side
efect for extensions writers, that their code becomes easier, so be it. What I
don't agree - rather, what I don't understand, is why it is presented in the
opposite direction.

> I highly suspect Aahz here would argue for a GIL even without the
> refcount issue, and even though I wouldn't agree, there's nothing
> weird or unreasonable about the argument, it's just a different
> viewpoint.

I consider it weird, at least. If I were to say that python should not allow
multithreading to simplify the lives of pure-python programmers, I hope I would
be shot down and ignored. But somehow I must consider perfectly natural the idea
of not allowing[1] multithreading when building C extensions, to simplify the
lives of extension programmers.

> > specially if it
> > became the only reason for a GIL. After all, one could argue for that goal
> in
> > almost all languages.
> 
> "B-B-B-But other languages do it that way!" is not a big factor in
> language decisions in Python.

That's not what I said. We are not talking about the _language_, but about one
very specific implementation detail. Not even that, I'm talking about one of the
reasons presented in favor of that specific implementation detail (while
agreeing with the others). The fact that the reason I'm having trouble with is
valid for almost any other language, and none of them have a GIL-like construct
(while still being successful, and not being exceptionally hard to build native
modules for) just suggests that _that_ particular reason for that particular
implementation detail is not a very strong one, even if all other reasons are.
 
> (**) - To be fair, Python didn't originally support threads, so there
> was a lot of code that would have become unsafe had threading been
> added without the GIL, and that probably influenced the decision to
> use a GIL, but I'm sure that wasn't only reason.  Would Python have a
> GIL if threading had been there from the start?  Who knows.

(This is a very good remmark. Maybe here lies the whole answer to my question.
We may be dragging the heavy chain of backward compatibility with existing
extension modules, that is just too costly to break.)

Regards,

Luis

[1] Ok, I know that is not exactly what the GIL does.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie


-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From davea at ieee.org  Wed May 20 23:35:53 2009
From: davea at ieee.org (Dave Angel)
Date: Wed, 20 May 2009 23:35:53 -0400
Subject: Trying to understand a very simple class - from the book "dive
	into 	python"
In-Reply-To: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
References: <62ff0c0f-5efd-4d93-8104-9fae78a76e5f@g3g2000pra.googlegroups.com>
Message-ID: <4A14CC19.6030200@ieee.org>



walterbyrd wrote:
> Example 5.6. Coding the FileInfo Class
> class FileInfo(UserDict):
>     "store file metadata"
>     def __init__(self, filename=ne):
>         UserDict.__init__(self)        (1)
>         self["name"] =ilename        (2)
>
>
> What I do not understand is the last line. I thought 'self' was
> supposed to refer to an instance of the object. But the square
> brackets seem to indicate a list. Except you can not assign values to
> a list like that. So where does "name" come from?
>
> I am sure this is totally simple, but I missing something.
>
>   
You're deriving your class from UserDict, which is a "Class that 
simulates a dictionary."  So you can use dictionary semantics on 
"self."  "name" is a key for the dict.






From pavlovevidence at gmail.com  Thu May 21 00:59:57 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 20 May 2009 21:59:57 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com> 
	<mailman.472.1242860891.8015.python-list@python.org>
	<a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
	<mailman.478.1242875435.8015.python-list@python.org>
Message-ID: <3e7d218e-acf3-404e-a6c0-b2b6e8a76875@y10g2000prc.googlegroups.com>

I don't have any reply to this post except for the following excerpts:

On May 20, 8:10?pm, Luis Alberto Zarrabeitia Gomez <ky... at uh.cu>
wrote:
> 2- in [almost] every other language, _you_ have to be aware of the critical
> sections when multithreading.
[snip]
> That's not what I said. We are not talking about the _language_, but about one
> very specific implementation detail. Not even that, I'm talking about one of the
> reasons presented in favor of that specific implementation detail (while
> agreeing with the others). The fact that the reason I'm having trouble with is
> valid for almost any other language, and none of them have a GIL-like construct
> (while still being successful, and not being exceptionally hard to build native
> modules for) just suggests that _that_ particular reason for that particular
> implementation detail is not a very strong one, even if all other reasons are.

No other languages have nesting by indentation (while still being
reasonablyt successful)....
etc

Comparisons to other languages are useless here.  In many cases Python
does things differently from most other languages and usually it's
better off for it.

The fact that other languages do something differently doesn't mean
that other way's better, in fact it really doesn't mean anything at
all.


Carl Banks


From davea at ieee.org  Thu May 21 01:07:00 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 21 May 2009 01:07:00 -0400
Subject: Yet another question about class property.
In-Reply-To: <b42c5a480905201821x22d815c1ic1f92631baded3c5@mail.gmail.com>
References: <b42c5a480905200120x50591665qb02b9fdccee08df2@mail.gmail.com>	<4A13D4B4.3030809@ieee.org>
	<b42c5a480905201821x22d815c1ic1f92631baded3c5@mail.gmail.com>
Message-ID: <4A14E174.4090003@ieee.org>

Jim Qiu wrote:
> Thanks for you patience, Dave.
> Obviously i have not got used to the python philosophy.
>
> Following you guide, i implemented the following code, and you are
> absolutely right.
>
> #!/usr/bin/python
> #coding:utf-8
>
> class Parent(object):
>
> def __init__(self):
> pass
>
> def displayAttrOfSubClass(self):
> print self.attrFromChild
>
> class Child(Parent):
> def __init__(self):
> self.attrFromChild = 'Hi, Everyone, Java does this support this trick!'
>
>
> childObj = Child()
> childObj.displayAttrOfSubClass()
>
>
> Python can use in the parent class a variable only instantiated by a
> sub-class, is this a point of advance of technique of Python?
>
> Jim
>
>   
>
(You're top-posting.  Also, for some reason the indentation is not being 
preserved in your messages.  No problem here, but more complex code 
examples would be totally illegible.)

In Python, you don't have to declare an attribute before using it.  
Rather than getting a compile-time error, like C++ or Java, you get a 
runtime error if the attribute isn't present by the time you use it.

However, if somebody (anybody) else has already defined it (assigned a 
value to it), then you can go ahead and use that value.  It's a common 
pattern with abstract base classes, and it's useful because those 
classes are never meant to be directly instantiated.

In C++ abstract classes, you have to declare all the *methods* you use, 
but you don't have to define their implementation.  You can call these 
methods, even though they don't exist in the base class, because the 
derived class will be defining them before you can get control.  
However, C++ gives no way to do that for data.

The real advantage is not that you can define a data attribute in a 
child class, but that its type can be different in each child class, and 
the base class generally need not know.



From kalyanchakravarthy at hyit.com  Thu May 21 01:31:02 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Thu, 21 May 2009 11:01:02 +0530
Subject: Error in code send Email
Message-ID: <8ca278430905202231w1b6a8cbsd50f88167b41251a@mail.gmail.com>

Hi All,


import smtplib

 mail="abc at xyz.com";
    subject="Hai";
    msg = 'Some Text';

    smtp_server = smtplib.SMTP( 'mail.%s' % mail.split( '@' )[-1] )
    smtp_server.sendmail(
          mail
        , [ mail ]
        , 'Subject: %s\n' % subject
            + 'To: %s\n' % mail
            + '\n'
            + msg
        )


I am using above  code to send an Email, for this i am not installed any
SMTP setup my local , I just given import smtplib
and I am getting following error

showing error at
 *smtp_server = smtplib.SMTP( 'mail.%s' % mail.split( '@' )[-1] )* this line

can any one tell that how to give STMP server setup in my local and run
successfully the above code.

**Traceback (most recent call last):
  File "C:\Program
Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py",
line 500, in __call__
    handler.post(*groups)
  File "C:\Documents and Settings\desk\Desktop\apps\temp\main.py",
line 129, in post
    smtp_server = smtplib.SMTP( 'mail.%s' % mail.split( '@' )[-1] )
  File "C:\Python26\lib\smtplib.py", line 239, in __init__
    (code, msg) = self.connect(host, port)
  File "C:\Python26\lib\smtplib.py", line 295, in connect
    self.sock = self._get_socket(host, port, self.timeout)
  File "C:\Python26\lib\smtplib.py", line 273, in _get_socket
    return socket.create_connection((port, host), timeout)
AttributeError: 'module' object has no attribute 'create_connection'



-- 
Regards
Kalyan
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From aotto1968 at t-online.de  Thu May 21 01:56:30 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Thu, 21 May 2009 07:56:30 +0200
Subject: PYTHONPATH on Windows XP module load problem
References: <guubg7$nnk$03$1@news.t-online.com>
	<mailman.390.1242742113.8015.python-list@python.org>
	<guuh3f$47k$00$1@news.t-online.com>
	<SbSdncYZUsrgT4_XnZ2dnUVZ_s2dnZ2d@pdx.net>
	<gv0gca$tlf$00$1@news.t-online.com>
	<ybadndVhzcxaGYnXnZ2dnUVZ_t2dnZ2d@pdx.net>
Message-ID: <gv2qef$8k8$03$1@news.t-online.com>

Hi,

  I setup the PYTHONPATH environment variable too

  does windows use this variable ?


mfg

  Andreas Otto


From conra2004 at yahoo.com  Thu May 21 03:55:45 2009
From: conra2004 at yahoo.com (yadin)
Date: Thu, 21 May 2009 00:55:45 -0700 (PDT)
Subject: finding repeated data sequences in a column
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>
	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com> 
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com> 
	<c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com> 
	<mailman.456.1242841999.8015.python-list@python.org>
Message-ID: <f0c45029-3983-4a84-8f08-2b497594c03e@r34g2000vbi.googlegroups.com>

On May 20, 6:53?pm, norseman <norse... at hughes.net> wrote:
> bearophileH... at lycos.com wrote:
> > yadin:
> >> How can I build up a program that tells me that this sequence
> >> 1000028706
> >> 1000028707
> >> 1000028708
> >> is repeated somewhere in the column, and how can i know where?
>
> > Can such patterns nest? That is, can you have a repeated pattern made
> > of an already seen pattern plus something else?
> > If you don't want a complex program, then you may need to specify the
> > problem better.
>
> > You may want something like LZ77 or releated (LZ78, etc):
> >http://en.wikipedia.org/wiki/LZ77
> > This may have a bug:
> >http://code.activestate.com/recipes/117226/
>
> > Bye,
> > bearophile
>
> ============================================
> index on column
> Ndx1 is set to index #1
> Ndx2 is set to index #2
> test Ndx1 against Ndx2
> ? ?if equal write line number and column content to a file
> ? ? ? ? ? ?(that's two things on one line: ?15 1000028706
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?283 1000028706 )
> ? ?Ndx1 is set to Ndx2
> ? ?Ndx2 is set to index #next
> loop to test ? ?writing out each duplicate set
>
> Then use the outfile and index on line number
>
> In similar manor, check if line current and next line line numbers are
> sequential. ?If so scan forward to match column content of lower line
> number and check first matched column's line number and next for
> sequential. ?Print them out if so
>
> everything in outfile has 1 or more duplicates
>
> 4 ?aa ? ? ? ? ? ? ? |--
> 5 ?bb ? ? ? ? |-- ? ? ?| ? ? ?thus 4/5 match 100/101
> 6 ?cc ? ? ? ? ? ?| ? ? |
> . ? ? ? ? ? ? ? ?| ? ? |
> 100 aa ? ? ? ? ? | ?|--
> 101 bb ? ? ? ? |--
> 102 ddd
> 103 cc ? ? ? ? ? ? ? ? ?there is a duplicate but not a sequence
> 200 ff
>
> mark duplicate sequences as tested and proceed on through
> ? ?seq1 may have more than one other seq in file.
> ? ?the progress is from start to finish without looking back
> ? ?thus each step forward has fewer lines to test.
> ? ?marking already knowns eliminates redundant sequence testing.
>
> By subseting on pass1 the expensive testing is greatly reduced.
> If you know your subset data won't exceed memory then the "outfile"
> can be held in memory to speed things up considerably.
>
> Today is: 20090520
> no code
>
> Steve- Hide quoted text -
>
> - Show quoted text -

this is the program...I wrote but is not working
I have a list of valves, and another of pressures;
If I am ask to find out which ones are the valves that are using all
this set of pressures, wanted best pressures
this is the program i wrote but is not working properly, it suppossed
to return in the case
find all the valves that are using pressures 1 "and" 2 "and" 3.
It returns me A, A2, A35....
The correct answer supposed to be A and A2...
if I were asked for pressures 56 and 78 the correct answer supossed to
be valves G and G2...

Valves = ['A','A','A','G', 'G', 'G',
'C','A2','A2','A2','F','G2','G2','G2','A35','A345','A4'] ##valve names
pressures = [1,2,3,4235,56,78,12, 1, 2, 3, 445, 45,56,78,1, 23,7] ##
valve pressures
result = []

bestpress = [1,2,3] ##wanted base pressures
print bestpress,'len bestpress is' , len(bestpress)

print len(Valves)
print len(Valves)
for j in range(len(Valves)):
#for i in range(len(bestpress)):
    #for j in range(len(Valves)):
    for i in range(len(bestpress)-2):
            if pressures [j]== bestpress[i] and bestpress [i+1]
==pressures [j+1] and bestpress [i+2]==pressures [j+2]:
                result.append(Valves[j])
                #i = i+1
                #j = j+1
            # print i, j, bestpress[i]
                print "common PSVs are", result


From http  Thu May 21 04:30:18 2009
From: http (Paul Rubin)
Date: 21 May 2009 01:30:18 -0700
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com>
	<mailman.472.1242860891.8015.python-list@python.org>
	<a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
Message-ID: <7xfxey7t9h.fsf@ruckus.brouhaha.com>

Carl Banks <pavlovevidence at gmail.com> writes:
> Why?  Do you seriously not see the benefit of simplifying the work of
> extention writers and core maintainers?  You don't have to agree that
> it's a good trade-off but it's a perfectly reasonable goal.
> 
> I highly suspect Aahz here would argue for a GIL even without the
> refcount issue, and even though I wouldn't agree, there's nothing
> weird or unreasonable about the argument, it's just a different
> viewpoint.

How about only setting a lock when a "safe" user extension is called.
There could also be an "unsafe" extension interface with no lock.  The
more important stdlib functions would be (carefully) written with the
unsafe interface.  Ordinary python code would not need a lock.  


From greg at cosc.canterbury.ac.nz  Thu May 21 04:33:51 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Thu, 21 May 2009 20:33:51 +1200
Subject: Import and absolute file names, sys.path including ''... or not
In-Reply-To: <mailman.462.1242849723.8015.python-list@python.org>
References: <mailman.406.1242754524.8015.python-list@python.org>	<gv1jhr$5q3$1@panix3.panix.com>
	<mailman.462.1242849723.8015.python-list@python.org>
Message-ID: <77khsuF1hhc36U1@mid.individual.net>

Jean-Michel Pichavant wrote:

> __import__('/home/jeanmichel/test')

The __import__ function takes *module* names, not
filesystem pathnames.

Giving it a pathname might happen to work some of
the time in some versions of Python, but it's not
an intended feature, and you shouldn't rely on it.

If you want to execute the contents of an arbitrary
file, rather than a module existing somewhere in the
Python module namespace, use execfile().

-- 
Greg


From __peter__ at web.de  Thu May 21 04:41:44 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 21 May 2009 10:41:44 +0200
Subject: finding repeated data sequences in a column
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>
	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
	<c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com>
	<mailman.456.1242841999.8015.python-list@python.org>
	<f0c45029-3983-4a84-8f08-2b497594c03e@r34g2000vbi.googlegroups.com>
Message-ID: <gv3448$qm5$03$1@news.t-online.com>

yadin wrote:

> On May 20, 6:53 pm, norseman <norse... at hughes.net> wrote:
>> bearophileH... at lycos.com wrote:
>> > yadin:
>> >> How can I build up a program that tells me that this sequence
>> >> 1000028706
>> >> 1000028707
>> >> 1000028708
>> >> is repeated somewhere in the column, and how can i know where?
>>
>> > Can such patterns nest? That is, can you have a repeated pattern made
>> > of an already seen pattern plus something else?
>> > If you don't want a complex program, then you may need to specify the
>> > problem better.
>>
>> > You may want something like LZ77 or releated (LZ78, etc):
>> >http://en.wikipedia.org/wiki/LZ77
>> > This may have a bug:
>> >http://code.activestate.com/recipes/117226/
>>
>> > Bye,
>> > bearophile
>>
>> ============================================
>> index on column
>> Ndx1 is set to index #1
>> Ndx2 is set to index #2
>> test Ndx1 against Ndx2
>> if equal write line number and column content to a file
>> (that's two things on one line:  15 1000028706
>> 283 1000028706 )
>> Ndx1 is set to Ndx2
>> Ndx2 is set to index #next
>> loop to test    writing out each duplicate set
>>
>> Then use the outfile and index on line number
>>
>> In similar manor, check if line current and next line line numbers are
>> sequential.  If so scan forward to match column content of lower line
>> number and check first matched column's line number and next for
>> sequential.  Print them out if so
>>
>> everything in outfile has 1 or more duplicates
>>
>> 4  aa               |--
>> 5  bb         |--      |      thus 4/5 match 100/101
>> 6  cc            |     |
>> .                |     |
>> 100 aa           |  |--
>> 101 bb         |--
>> 102 ddd
>> 103 cc                  there is a duplicate but not a sequence
>> 200 ff
>>
>> mark duplicate sequences as tested and proceed on through
>> seq1 may have more than one other seq in file.
>> the progress is from start to finish without looking back
>> thus each step forward has fewer lines to test.
>> marking already knowns eliminates redundant sequence testing.
>>
>> By subseting on pass1 the expensive testing is greatly reduced.
>> If you know your subset data won't exceed memory then the "outfile"
>> can be held in memory to speed things up considerably.
>>
>> Today is: 20090520
>> no code
>>
>> Steve- Hide quoted text -
>>
>> - Show quoted text -
> 
> this is the program...I wrote but is not working
> I have a list of valves, and another of pressures;
> If I am ask to find out which ones are the valves that are using all
> this set of pressures, wanted best pressures
> this is the program i wrote but is not working properly, it suppossed
> to return in the case
> find all the valves that are using pressures 1 "and" 2 "and" 3.
> It returns me A, A2, A35....
> The correct answer supposed to be A and A2...
> if I were asked for pressures 56 and 78 the correct answer supossed to
> be valves G and G2...
> 
> Valves = ['A','A','A','G', 'G', 'G',
> 'C','A2','A2','A2','F','G2','G2','G2','A35','A345','A4'] ##valve names
> pressures = [1,2,3,4235,56,78,12, 1, 2, 3, 445, 45,56,78,1, 23,7] ##
> valve pressures
> result = []
> 
> bestpress = [1,2,3] ##wanted base pressures
> print bestpress,'len bestpress is' , len(bestpress)
> 
> print len(Valves)
> print len(Valves)
> for j in range(len(Valves)):
> #for i in range(len(bestpress)):
>     #for j in range(len(Valves)):
>     for i in range(len(bestpress)-2):
>             if pressures [j]== bestpress[i] and bestpress [i+1]
> ==pressures [j+1] and bestpress [i+2]==pressures [j+2]:
>                 result.append(Valves[j])
>                 #i = i+1
>                 #j = j+1
>             # print i, j, bestpress[i]
>                 print "common PSVs are", result

If I understand your explanation correctly you don't actually care about the 
sequence, you just want all valves that show the pressures specified in 
bestpress. If that's correct your problem becomes easier. You can make a 
lookup table that maps a given pressure to a set of all valves that had it 
and then calculate the intersection.

from collections import defaultdict

def intersection(sets):
    return reduce(set.intersection, sets)

valves = ['A', 'A', 'A', 'G', 'G', 'G', 'C', 'A2', 'A2', 'A2', 'F', 'G2', 
'G2', 'G2', 'A35', 'A345', 'A4']
pressures = [1, 2, 3, 4235, 56, 78, 12, 1, 2, 3, 445, 45, 56, 78, 1, 23, 7]

lookup = defaultdict(set)
for v, p in zip(valves, pressures):
    lookup[p].add(v)

result = []

wanted_pressures = [1, 2, 3]
print wanted_pressures, "-->", intersection(lookup[p] for p in 
wanted_pressures)

Peter



From duncan.booth at invalid.invalid  Thu May 21 04:46:38 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 21 May 2009 08:46:38 GMT
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<mailman.407.1242754952.8015.python-list@python.org>
	<guv968$2l5j$1@adenine.netfront.net>
	<de32cc030905191521u50371c81v31c21722ead64a87@mail.gmail.com>
	<mailman.455.1242841600.8015.python-list@python.org>
	<0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>
	<gv1nor$10uu$1@adenine.netfront.net>
Message-ID: <Xns9C1262ED6DA67duncanbooth@127.0.0.1>

namekuseijin <namekuseijin at gmail.com> wrote:

> I find it completely unimaginable that people would even think 
> suggesting the idea that Java is simpler.  It's one of the most stupidly 
> verbose and cranky languages out there, to the point you can't really do 
> anything of relevance without an IDE automatically pumping out lots of 
> scaffold code for you.
> 

But that means Java programmers are obviously more productive than Python 
programmers: they produce many more lines of code per day even if much of 
it is boileplate or even automatically generated. Managers like that.

OTOH, I consider it a productive day if I end up with fewer lines of code 
than I started with.

-- 
Duncan Booth http://kupuguy.blogspot.com


From duncan.booth at invalid.invalid  Thu May 21 04:46:38 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 21 May 2009 08:46:38 GMT
Subject: reseting an iterator
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
	<pan.2009.05.21.00.47.48@REMOVE.THIS.cybersource.com.au>
Message-ID: <Xns9C12623BF4E9Eduncanbooth@127.0.0.1>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

> On Wed, 20 May 2009 11:35:47 -0700, Jan wrote:
> 
>> Wouldn't it be easy for Python to implement generating functions so that
>> the iterators they return are equipped with a __reset__() method?
> 
> No.
> 
> def gen():
>     for name in os.listdir('.'):
>         yield open(name).read()
>         os.remove(name)
> 
> 
> How would you "easily" reset this generator so that it returns the same 
> values each time?
> 
> That's an extreme example, but as a general rule, generators/iterators 
> are one-shot: having consumed a value, you can't get it back again 
> without re-creating it from scratch, or possibly not even then. Here's a 
> less destructive example:
> 
> def gen():
>     for i in xrange(10):
>         yield time.time()
> 

While I agree 100% with your 'No', I don't actually agree with your 
explanation.

Why are you assuming that resetting a generator should return the same 
values each time? Why shouldn't resetting put it back to some known state, 
but allow the resulting output to vary?

For example, that's what happens in the .Net universe with Linq: a Linq 
expression is roughly equivalent to a Python iterable and every time you 
iterate over it you can get a different set of results.

The following code would, I think, work except that generators don't allow 
you to add attributes:

from functools import wraps
def resettable(generator):
	@wraps(generator)
	def wrapper(*args, **kw):
		def __reset__():
		    gen = generator(*args, **kw)
		    gen.__reset__ = __reset__
		    return gen
		return __reset__()
	return wrapper

@resettable
def gen(n):
	for i in xrange(n):
		yield i, time.time()

		
import time
it = gen(3)
for v in it: print v
it = it.__reset__()
for v in it: print v


The simpler solution is just to reconstruct the iterator yourself.

-- 
Duncan Booth http://kupuguy.blogspot.com


From deets at nospam.web.de  Thu May 21 04:51:54 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 21 May 2009 10:51:54 +0200
Subject: scoping problem with list comprehension // learning Python
In-Reply-To: <mailman.470.1242857251.8015.python-list@python.org>
References: <mailman.470.1242857251.8015.python-list@python.org>
Message-ID: <77kj1aF1hun0qU1@mid.uni-berlin.de>

Adrian Dragulescu schrieb:
> 
> I just started to learn python (first posting to the list).
> 
> I have a list of dates as strings  that I want to convert to a list of 
> datetime objects.  Here is my debugging session from inside a method.
> 
> (Pdb) formatIndex
> '%Y-%m-%d'
> (Pdb) [datetime.strptime(i, formatIndex) for i in self.index[0:3]]
> *** NameError: global name 'formatIndex' is not defined
> (Pdb) [datetime.strptime(i, '%Y-%m-%d') for i in self.index[0:3]]
> [datetime.datetime(2007, 1, 3, 0, 0), datetime.datetime(2007, 1, 4, 0, 
> 0), datetime.datetime(2007, 1, 5, 0, 0)]
> (Pdb)
> 
> How come I get an error that formatIndex is not defined? I just show 
> that it has value '%Y-%m-%d', in the same method scope.  Not sure why it 
> says "global name", as I am in a method.
> 
> If I run it as a stand-alone, it works:
>   index = ['2007-01-01', '2007-01-02', '2007-01-03']
>   formatIndex = '%Y-%m-%d'
>   print([datetime.strptime(i, formatIndex) for i in index])
> 
> Any suggestions much appreciated.  I'm sure it's something trivial.  I'm 
> using Python30.

I think your problem here is Pdb. You can't always assume that scoping 
and assignment works there as desired.

If you do the same in the interpreter instead of Pdb, does it work? It 
works for me in Py2.5, don't have a 3.0 handy.

Diez


From lie.1296 at gmail.com  Thu May 21 04:55:00 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 21 May 2009 08:55:00 GMT
Subject: Adding a Par construct to Python?
In-Reply-To: <a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com>
	<mailman.472.1242860891.8015.python-list@python.org>
	<a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
Message-ID: <EF8Rl.12489$y61.3592@news-server.bigpond.net.au>

Carl Banks wrote:
>> There must be another reason (i.e, the refcounts) to argue _for_ the GIL,
> 
> Why?

Nobody likes GIL, but it just have to be there or things starts crumbling...

Nobody would actually argue _for_ GIL, they just know from experience, 
that people that successfully GIL in the past, always produces 
unsatisfactory solution.

Among them are slowing down single threaded code, locking issues, etc.

They are not really arguments _for_ GIL, but a challenge for the next 
people that tries to remove it to think about before dedicating the rest 
of their life to removing GIL; only to found that nobody likes the 
solution...


From rustompmody at gmail.com  Thu May 21 05:22:18 2009
From: rustompmody at gmail.com (Rustom Mody)
Date: Thu, 21 May 2009 14:52:18 +0530
Subject: making a python program in windows
Message-ID: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>

I know how to make a python script behave like a (standalone) program
in unix --
1. put a #! path/to/python as the first line
2. make the file executable

The closest I know how to do this in windows is:
r-click the file in win-explorer
goto properties
goto open with
change pythonw to python

Can someone enlighten me about a more scriptish way of doing this?
Basically if I have to setup that program on other (windows) m/cs is
there some .bat or .vbs or some regedit thingy Ive to do to avoid the
Rt-click routine?


From martin.hellwig at dcuktec.org  Thu May 21 06:19:58 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 21 May 2009 11:19:58 +0100
Subject: making a python program in windows
In-Reply-To: <mailman.488.1242897741.8015.python-list@python.org>
References: <mailman.488.1242897741.8015.python-list@python.org>
Message-ID: <l-OdnQ3QTPFTt4jXnZ2dnUVZ8tJi4p2d@bt.com>

Rustom Mody wrote:
> I know how to make a python script behave like a (standalone) program
> in unix --
> 1. put a #! path/to/python as the first line
> 2. make the file executable
> 
> The closest I know how to do this in windows is:
> r-click the file in win-explorer
> goto properties
> goto open with
> change pythonw to python
> 
> Can someone enlighten me about a more scriptish way of doing this?
> Basically if I have to setup that program on other (windows) m/cs is
> there some .bat or .vbs or some regedit thingy Ive to do to avoid the
> Rt-click routine?

Since you don't know for sure if a Python environment is available on 
the other windows machine and whether the file associations are 
configured correctly, the best thing you can do is to use something like 
py2exe and distribute the result of that.

-- 
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'


From sion at viridian.paintbox  Thu May 21 06:47:17 2009
From: sion at viridian.paintbox (Sion Arrowsmith)
Date: Thu, 21 May 2009 10:47:17 GMT
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>
	<gv1nor$10uu$1@adenine.netfront.net>
	<Xns9C1262ED6DA67duncanbooth@127.0.0.1>
Message-ID: <ViaRl.95042$Ku5.64377@newsfe10.ams2>

Duncan Booth  <duncan.booth at suttoncourtenay.org.uk> wrote:
>namekuseijin <namekuseijin at gmail.com> wrote:
>> I find it completely unimaginable that people would even think 
>> suggesting the idea that Java is simpler.  It's one of the most stupidly 
>> verbose and cranky languages out there, to the point you can't really do 
>> anything of relevance without an IDE automatically pumping out lots of 
>> scaffold code for you.
>But that means Java programmers are obviously more productive than Python 
>programmers: they produce many more lines of code per day even if much of 
>it is boileplate or even automatically generated. Managers like that.
>
>OTOH, I consider it a productive day if I end up with fewer lines of code 
>than I started with.

A friend once justified a negative LOC count as being the sign of a
good day with the following observation:

Code that doesn't exist contains no bugs.
Code that doesn't exist takes no time to execute.
Code that doesn't exist takes up no space.
Code that doesn't exist doesn't need maintenance.

Once, when faced with a rather hairy problem that client requirements
dictated a pure Java solution for, I coded up a fully functional
prototype in Python to get the logic sorted out, and then translated
it. Even given the optimisations of manual translation, and being
able to dispose of one portion of the Python which Java supplied the
functionality for out of the box (thread timeout, I think it was),
the code grew by 200%. That was a very unproductive day.

-- 
\S

   under construction



From rustompmody at gmail.com  Thu May 21 07:01:20 2009
From: rustompmody at gmail.com (rustom)
Date: Thu, 21 May 2009 04:01:20 -0700 (PDT)
Subject: making a python program in windows
References: <mailman.488.1242897741.8015.python-list@python.org> 
	<l-OdnQ3QTPFTt4jXnZ2dnUVZ8tJi4p2d@bt.com>
Message-ID: <c361a5d5-e63a-4117-8c55-21ae31245ff2@b6g2000pre.googlegroups.com>

On May 21, 3:19?pm, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> Rustom Mody wrote:
> > I know how to make a python script behave like a (standalone) program
> > in unix --
> > 1. put a #! path/to/python as the first line
> > 2. make the file executable
>
> > The closest I know how to do this in windows is:
> > r-click the file in win-explorer
> > goto properties
> > goto open with
> > change pythonw to python
>
> > Can someone enlighten me about a more scriptish way of doing this?
> > Basically if I have to setup that program on other (windows) m/cs is
> > there some .bat or .vbs or some regedit thingy Ive to do to avoid the
> > Rt-click routine?
>
> Since you don't know for sure if a Python environment is available on
> the other windows machine and whether the file associations are
> configured correctly, the best thing you can do is to use something like
> py2exe and distribute the result of that.

Oh - Oh! Not an exe please! I dont want to move away from readable
text files if possible.

I certainly know that python2.6 is installed.
Why that installation by default does not put python.exe on the path I
dont know but that is best corrected by hand.

Bottom Line: Assume that from a command line (cmd) python runs and
gives its interpreter prompt.
When run from cygwin it hangs but thats another story. Just dont
assume cygwin.

i suppose the question is entirely about setting properly (and
grokking) file associations -- why is a .py file associated with
pythonw and not python? And is making this association right enough to
make a .py file in windows behave like a shebang file in unix?

[And is there a more appropriate list for such questions?]

Thanks


From stef.mientki at gmail.com  Thu May 21 07:11:02 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Thu, 21 May 2009 13:11:02 +0200
Subject: making a python program in windows
In-Reply-To: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>
References: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>
Message-ID: <4A1536C6.3080101@gmail.com>

Rustom Mody wrote:
> I know how to make a python script behave like a (standalone) program
> in unix --
> 1. put a #! path/to/python as the first line
> 2. make the file executable
>
> The closest I know how to do this in windows is:
> r-click the file in win-explorer
> goto properties
> goto open with
> change pythonw to python
>
> Can someone enlighten me about a more scriptish way of doing this?
> Basically if I have to setup that program on other (windows) m/cs is
> there some .bat or .vbs or some regedit thingy 
Python can replace all of that ;-)
But to your orginal question,
why not change the file associate in windows ?

cheers,
Stef


From ldo at geek-central.gen.new_zealand  Thu May 21 07:18:15 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 21 May 2009 23:18:15 +1200
Subject: How to build Python 2.6.2 on HP-UX Itanium with thread support?
References: <3dcdc298-ff77-443d-a7df-b1635f3372b2@z7g2000vbh.googlegroups.com>
	<51d1dd3f-322d-47fa-9d44-75b92c6ef4e2@e20g2000vbc.googlegroups.com>
	<2003c02c-6a9f-40fb-b19c-30625ed09eb0@s21g2000vbb.googlegroups.com>
	<fc58e391-7979-4220-b6c9-a06c23ee4dbb@21g2000vbk.googlegroups.com>
Message-ID: <gv3d9n$k1p$1@lust.ihug.co.nz>

In message <fc58e391-7979-4220-b6c9-
a06c23ee4dbb at 21g2000vbk.googlegroups.com>, henning.vonbargen at arcor.de wrote:

> I'm used to "configure; make; make install", which usually works well on
> other platforms...

It's often worthwhile to try

    ./configure --help

and see if any of the options might be relevant.



From srijayanth at gmail.com  Thu May 21 07:23:36 2009
From: srijayanth at gmail.com (Srijayanth Sridhar)
Date: Thu, 21 May 2009 16:53:36 +0530
Subject: A question regd configobj
Message-ID: <5ead360a0905210423q526e21ffgad3be1415ac148dd@mail.gmail.com>

Hello,

I am wondering if it is possible to have hexadecimal strings in a ini file
and have configobj parse it correctly.

for eg:
moonwolf at trantor:~/python/config$ cat foo
foo="\x96\x97"
.
.
.
>>> a=ConfigObj("foo")
>>> a
ConfigObj({'foo': '\\x96\\x97'})
>>> a['foo']
'\\x96\\x97'

As you can see the string has escaped the '\' and I want to suppress that
behavior. I've looked at the documentation and haven't been able to figure
out if this is an available feature or not.

Any help will be greatly appreciated.

Thank you,

Jayanth
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From gandalf at shopzeus.com  Thu May 21 07:25:04 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Thu, 21 May 2009 13:25:04 +0200
Subject: dbfpy - cannot store new record
Message-ID: <4A153A10.1080906@shopzeus.com>

Given this example program:

import dbfpy
def dbf_open(tblname):
    fpath = os.path.join(local.DB_DIR,tblname)
    f = file(fpath,"ab+")
    f.seek(0)
    tbl = dbf.Dbf(f)
    return tbl

tbl = dbf_open("partners.dbf")
rec = tbl.newRecord()
rec["FIELDNAME1"] = 1
rec["FIELDNAME2"] = "Somebody"
rec.store()
tbl.close()

I get no exception, no error etc. But the new record is NOT appended to 
the table. What is wrong here?

Thanks,

   Laszlo



From aotto1968 at t-online.de  Thu May 21 07:37:47 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Thu, 21 May 2009 13:37:47 +0200
Subject: PYTHONPATH on Windows XP module load problem
References: <guubg7$nnk$03$1@news.t-online.com>
	<mailman.390.1242742113.8015.python-list@python.org>
	<guuh3f$47k$00$1@news.t-online.com>
	<SbSdncYZUsrgT4_XnZ2dnUVZ_s2dnZ2d@pdx.net>
	<gv0gca$tlf$00$1@news.t-online.com>
	<ybadndVhzcxaGYnXnZ2dnUVZ_t2dnZ2d@pdx.net>
	<gv2qef$8k8$03$1@news.t-online.com>
Message-ID: <gv3eeb$gg3$00$1@news.t-online.com>

Hi,

  I solved the problem ...
  thank you for your help


mfg

  Andreas Otto


From mypromise at sina.com  Thu May 21 07:57:27 2009
From: mypromise at sina.com (zhouhaifeng)
Date: Thu, 21 May 2009 19:57:27 +0800
Subject: How to send a compsite key to window
Message-ID: <4A1541A7.3020404@sina.com>

just like "ctrl + A",

I want to select all the text in a window, now , I operate right menu to
get it, but it can not work all the time.
so I want to send "ctrl + a" to the window


blow is my code
thanks


hWnd = win32gui.FindWindow(None, "????????????????V1.09-?
????")
print hWnd
if hWnd <> 0:
print "????????"
point = (755, 175)
x, y = point
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)
print "????"
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTUP, x, y, 0, 0)

win32api.Sleep(1000)

#??"??"
x = x + 10
y = y + 115
point = (x, y)
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)

win32api.Sleep(500)

#????
point = (455, 175)
x, y = point
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTUP, x, y, 0, 0)
#win32api.SendMessage(hwnd, win32con.WM_KEYDOWN, win32con.VK_CONTROL, 0)
#win32api.SendMessage(hwnd, win32con.WM_KEYUP, win32con.VK_CONTROL, 0)
win32api.Sleep(500)

#??"??"
x = x + 10
y = y + 25
point = (x, y)
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)


From redforks at gmail.com  Thu May 21 08:07:50 2009
From: redforks at gmail.com (Red Forks)
Date: Thu, 21 May 2009 20:07:50 +0800
Subject: defaultdict's bug or feature?
Message-ID: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>

from collections import defaultdict

d = defaultdict(set)
assert isinstance(d['a'], set)
assert isinstance(d.get('b'), set)

d['a'] is ok, and a new set object is insert to d, but d.get('b') won't.

It's a bug, or just a feature?

I think dict.get() method is just a *safe* version of dict[key], maybe it
should be:

def get(self, key, default = None):
  try:
    return self[key]
  except KeyError:
    return default
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From youhvee at googlemail.com  Thu May 21 08:08:39 2009
From: youhvee at googlemail.com (youhvee at googlemail.com)
Date: Thu, 21 May 2009 05:08:39 -0700 (PDT)
Subject: A list with periodic boundary conditions
Message-ID: <0f324d00-875a-4d18-bd8b-981997a34e44@q14g2000vbn.googlegroups.com>

Hi,

I'm trying to create a new class of list that has periodic boundary
conditions.

Here's what I have so far:

class wrappedList(list):
    def __getitem__(self, p):
        return list.__getitem__(self, p%len(self))
    def __setitem__(self, p, v):
        list.__setitem__(self, p%len(self), v)

>>>> a=wrappedList(range(10))
>>>> a[1]
1
>>>> a[11]
1

But I would also like to make slices. For instance I would like
>>>> a[8:11]
[8, 9, 0]

I can do it by copying, but I want to return a view to the original
data, and I have no idea where to start. It seems that the slice needs
to retain some knowledge of the list from which it derived. i.e. it
needs to know that it is a slice. Any ideas on how I can extend this
to allow views?

Thanks for any help.

-AM


From duncan.booth at invalid.invalid  Thu May 21 08:09:49 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 21 May 2009 12:09:49 GMT
Subject: making a python program in windows
References: <mailman.488.1242897741.8015.python-list@python.org>
	<l-OdnQ3QTPFTt4jXnZ2dnUVZ8tJi4p2d@bt.com>
	<c361a5d5-e63a-4117-8c55-21ae31245ff2@b6g2000pre.googlegroups.com>
Message-ID: <Xns9C1284B6480C9duncanbooth@127.0.0.1>

rustom <rustompmody at gmail.com> wrote:

> i suppose the question is entirely about setting properly (and
> grokking) file associations -- why is a .py file associated with
> pythonw and not python? And is making this association right enough to
> make a .py file in windows behave like a shebang file in unix?

I think the question about the file association is one you have to answer 
for yourself. When you install Python it associates .pyw with pythonw and 
.py with python. If something on your system has changed this the best 
thing you can do is to change it back.

Try typing the following commands and then fixing any differences by typing 
the expected output as the command parameter 
(e.g. "assoc .py=Python.File"):

C:\>assoc .py
.py=Python.File

C:\>assoc .pyw
.pyw=Python.NoConFile

C:\>ftype Python.file
Python.file="C:\Python26\python.exe" "%1" %*

C:\>ftype Python.NoConFile
Python.NoConFile="C:\Python26\pythonw.exe" "%1" %*


-- 
Duncan Booth http://kupuguy.blogspot.com


From antoine.mechelynck at gmail.com  Thu May 21 08:27:13 2009
From: antoine.mechelynck at gmail.com (Tony Mechelynck)
Date: Thu, 21 May 2009 14:27:13 +0200
Subject: [ANN] vim patch to support python3 interface
In-Reply-To: <OFE2EA6A30.933C8862-ONC12575B4.0058ED0E-C12575B4.005B2741@br-automation.com>
References: <OFE2EA6A30.933C8862-ONC12575B4.0058ED0E-C12575B4.005B2741@br-automation.com>
Message-ID: <4A1548A1.1040101@gmail.com>

On 12/05/09 18:35, Roland Puntaier wrote:
> Hello,
>
> I have ported vim's python interface (if_python.c) to the python3 C-API.
>
> The changed files are:
> - Makefile (for linux)
> - Make_mvc.mak (for windows)
> - if_python3.c is a new file for the python3 related sources. it is based
> on if_python.c.
>
> All of them are in the ``src`` subdirectory.
[...]

Make_mvc.mak is not, and by far, the only makefile used by people who 
build Vim on Windows. If you want your port to become the "main" version 
some day, patches for the other makefiles should also be available. For 
instance, Steve Hall (who maintains the Vim builds, with and without 
Cream, but with Python et al., hosted with the Cream project) uses, I 
think, the Make_cyg.mak -- and I've seen now and again posts by Windows 
users building by means of the Make_ming.mak too. I've used the 
make_bc5.mak in the past, but the problems I had with it (when trying to 
use Unicode in Vim on Win98) made me switch to Make_cyg.mak even before 
moving up to XP and then to Linux-only; but my HowTo "for Windows" still 
includes settings for it.


Best regards,
Tony.
-- 
The greatest dangers to liberty lurk in insidious encroachment by men
of zeal, well-meaning but without understanding.
		-- Justice Louis D. Brandeis


From aotto1968 at t-online.de  Thu May 21 08:35:09 2009
From: aotto1968 at t-online.de (Andreas Otto)
Date: Thu, 21 May 2009 14:35:09 +0200
Subject: ANNOUNCE: libmsgque 3.2
Message-ID: <gv3hpu$l6b$03$1@news.t-online.com>


ANNOUNCE a minor feature improvement of libmsgque ...


What is LibMsgque
=================

LibMsgque is an OS independent, Programming Language independent and
Hardware independent solution to link applications together to act like a
single application. Or with other words, LibMsgque is an Application-Server
toolkit.


Highlights of the current Release:
=================================

This release introduce a new windows build into the LibMsgque world.
The build switched from the GNU toolchain to "Visual C++ 2008 Express"

This is the official statement for this switch:

  The decision to use GNU tools on Windows including
  automake, autoconf, libtool and mingw was wrong.
  The tools were replaced by Visual C++ 2008 Express.
  The reason was the extremely low performance of the
  GNU tools on Windows which end up in a 20min overhead per
  configuration life-cycle and a 5min overhead per build.
  This end up in an additional TCO of 2000euro per release.


In addition the performance-comparison between "c", "tcl", "python"
and "java" was updated

  -> results: http://libmsgque.sourceforge.net/performance.htm

After quite a wile I'm now able to support python on windows


The Web-Site was updated:
=========================

? ?-> http://libmsgque.sourceforge.net

? For a fast introduction use the following URL:

? ?-> http://libmsgque.sourceforge.net/features.htm



mfg

? Andreas Otto


From mypromise at sina.com  Thu May 21 08:38:26 2009
From: mypromise at sina.com (zhouhaifeng)
Date: Thu, 21 May 2009 20:38:26 +0800
Subject: How to send a compsite key to window
Message-ID: <4A154B42.1040306@sina.com>

just like "ctrl + A",

I want to select all the text in a window, now , I operate right menu to
get it, but it can not work all the time.
so I want to send "ctrl + a" to the window


blow is my code
thanks


hWnd = win32gui.FindWindow(None, "????????????????V1.09-?
????")
print hWnd
if hWnd <> 0:
print "????????"
point = (755, 175)
x, y = point
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)
print "????"
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTUP, x, y, 0, 0)

win32api.Sleep(1000)

#??"??"
x = x + 10
y = y + 115
point = (x, y)
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)

win32api.Sleep(500)

#????
point = (455, 175)
x, y = point
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_RIGHTUP, x, y, 0, 0)
#win32api.SendMessage(hwnd, win32con.WM_KEYDOWN, win32con.VK_CONTROL, 0)
#win32api.SendMessage(hwnd, win32con.WM_KEYUP, win32con.VK_CONTROL, 0)
win32api.Sleep(500)

#??"??"
x = x + 10
y = y + 25
point = (x, y)
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)



From google at mrabarnett.plus.com  Thu May 21 08:41:56 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 13:41:56 +0100
Subject: defaultdict's bug or feature?
In-Reply-To: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
Message-ID: <4A154C14.1040805@mrabarnett.plus.com>

Red Forks wrote:
> from collections import defaultdict
> 
> d = defaultdict(set)
> assert isinstance(d['a'], set)
> assert isinstance(d.get('b'), set)
> 
> d['a'] is ok, and a new set object is insert to d, but d.get('b') won't.
> 
> It's a bug, or just a feature?
> 
A feature.

> I think dict.get() method is just a /safe/ version of dict[key], maybe 
> it should be:
>  
> def get(self, key, default = None):
>   try:
>     return self[key]
>   except KeyError:
>     return default
> 
Isn't that what it does already?


With dict you have the choice of whether to raise an exception or return 
a default value if the key is missing.

With defaultdict you have the choice of whether to add the value or
return a default value if the key is missing.

Both classes have their uses.


From kyrie at uh.cu  Thu May 21 08:50:18 2009
From: kyrie at uh.cu (Luis Alberto Zarrabeitia Gomez)
Date: Thu, 21 May 2009 08:50:18 -0400
Subject: Adding a Par construct to Python?
In-Reply-To: <3e7d218e-acf3-404e-a6c0-b2b6e8a76875@y10g2000prc.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<gv1vg7$91r$1@panix3.panix.com>
	<mailman.472.1242860891.8015.python-list@python.org>
	<a4f1b81a-c336-49f5-8d32-e7376c609392@z19g2000vbz.googlegroups.com>
	<mailman.478.1242875435.8015.python-list@python.org>
	<3e7d218e-acf3-404e-a6c0-b2b6e8a76875@y10g2000prc.googlegroups.com>
Message-ID: <1242910218.4a154e0a2a0fe@mail.uh.cu>


Quoting Carl Banks <pavlovevidence at gmail.com>:

> I don't have any reply to this post except for the following excerpts:
> 
> On May 20, 8:10?pm, Luis Alberto Zarrabeitia Gomez <ky... at uh.cu>
> wrote:
> > 2- in [almost] every other language, _you_ have to be aware of the
> critical
> > sections when multithreading.
> [snip]
> > That's not what I said. We are not talking about the _language_, but about
> one
> > very specific implementation detail. Not even that, I'm talking about one
> of the
> > reasons presented in favor of that specific implementation detail (while
> > agreeing with the others). 
[...]
> 
> No other languages have nesting by indentation (while still being
> reasonablyt successful)....
> etc
> 
> Comparisons to other languages are useless here.  In many cases Python
> does things differently from most other languages and usually it's
> better off for it.

You seem to have missed that I'm not talking about the language but about a
specific implementation detail of CPython. I thought that my poor choice of
words in that sentence was completely clarified by the paragraphs that followed,
but apparently it wasn't. In my "2-" point, maybe I should've said instead: "in
[almost] every language, INCLUDING (proper) PYTHON, you have to be aware of
critcal sections when multithreading". 

> The fact that other languages do something differently doesn't mean
> that other way's better, in fact it really doesn't mean anything at
> all.

No, it doesn't mean that it's better, and I didn't say it was. But it _does_
show that it is _possible_. For an argument about how hard could be to write
native extensions in there was no GIL, the fact that there are many other
GIL-less platforms[1] where is not painful to write native extensions is a valid
counter-example. And that, in all those languages and platforms (including
python), the only one where I hear that explicit, granular locking is too hard
or whatever[2], is CPython's /native/ extensions, is what I found weird.

Regards,

Luis

[1] Including the python implementations for .net and java.
[2] Really, this is was my question and nothing more. I was not comparing, I was
trying to understand what was that "whatever" that made it so hard for CPython.
And your footnote in the previous message gave me a reasonable explanation.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie

-- 
Participe en Universidad 2010, del 8 al 12 de febrero de 2010
La Habana, Cuba 
http://www.universidad2010.cu



From ebonak at hotmail.com  Thu May 21 09:06:39 2009
From: ebonak at hotmail.com (Esmail)
Date: Thu, 21 May 2009 09:06:39 -0400
Subject: Your Favorite Python Book
In-Reply-To: <2dc0c81b0905111635x5a598d8bh74e4f7fa76e20b33@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>	<50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>	<1242078761.3662.1314940065@webmail.messagingengine.com>
	<2dc0c81b0905111635x5a598d8bh74e4f7fa76e20b33@mail.gmail.com>
Message-ID: <gv3jkv$gc1$1@ger.gmane.org>

Shawn Milochik wrote:
> On Mon, May 11, 2009 at 5:52 PM,  <python at bdurham.com> wrote:
>> Sam,
>>
>> In no specific order (I brought them all):
>>
>> Wesley Chun's "Core Python Programming"
>>
>> http://mail.python.org/mailman/listinfo/python-list
>>
> 
> I second the Wesley Chun recommendation wholeheartedly. 

This book keeps getting mentioned, I'll have to check it out.
Perhaps some of you can share what about it you like in
particular.

Thanks,
Esmail



From fasteliteprogrammer at yahoo.com  Thu May 21 09:18:08 2009
From: fasteliteprogrammer at yahoo.com (Craig)
Date: Thu, 21 May 2009 06:18:08 -0700 (PDT)
Subject: python question
Message-ID: <407409.23763.qm@web36503.mail.mud.yahoo.com>


How do i install this.i never seen a python write in c before.


      


From fasteliteprogrammer at yahoo.com  Thu May 21 09:19:23 2009
From: fasteliteprogrammer at yahoo.com (Craig)
Date: Thu, 21 May 2009 06:19:23 -0700 (PDT)
Subject: No subject
Message-ID: <1705.22207.qm@web36507.mail.mud.yahoo.com>


http://downloads.emperorlinux.com/contrib/pyiw
http://downloads.emperorlinux.com/contrib/pywpa


Sorry fro the 2 post.How do i install a python moudles write en in C?


      


From google at mrabarnett.plus.com  Thu May 21 09:29:24 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 14:29:24 +0100
Subject: dbfpy - cannot store new record
In-Reply-To: <4A153A10.1080906@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com>
Message-ID: <4A155734.6050306@mrabarnett.plus.com>

Laszlo Nagy wrote:
> Given this example program:
> 
> import dbfpy
> def dbf_open(tblname):
>    fpath = os.path.join(local.DB_DIR,tblname)
>    f = file(fpath,"ab+")
>    f.seek(0)
>    tbl = dbf.Dbf(f)
>    return tbl
> 
> tbl = dbf_open("partners.dbf")
> rec = tbl.newRecord()
> rec["FIELDNAME1"] = 1
> rec["FIELDNAME2"] = "Somebody"
> rec.store()
> tbl.close()
> 
> I get no exception, no error etc. But the new record is NOT appended to 
> the table. What is wrong here?
> 
I've downloaded dbfpy and experimented with it and I've found that
opening the file with file(fpath,"ab+") causes some extra junk to be
appended to the end of the file when the DBF file is closed. It works
much better (and is simpler!) if you open the DBF file with the
filename:

fpath = os.path.join(local.DB_DIR, "partners.dbf")
tbl = dbf.Dbf(fpath)
rec = tbl.newRecord()
rec["FIELDNAME1"] = 1
rec["FIELDNAME2"] = "Somebody"
rec.store()
tbl.close()


From skip at pobox.com  Thu May 21 09:34:09 2009
From: skip at pobox.com (skip at pobox.com)
Date: Thu, 21 May 2009 08:34:09 -0500 (CDT)
Subject: Generating zipped or gzipped attachment with email package?
Message-ID: <20090521133409.A5F1E1084F58@montanaro.dyndns.org>

I have a script which allows me to generate MIME messages with appropriate
attachments.  It's essentially a lightly modified version of the second
example from this page of the email package docs:

    http://docs.python.org/library/email-examples.html

I want to modify my script to automatically zip or gzip files which exceed
some size threshold.  Doing the zip/gzip dance is no problem.  I'm concerned
about how to specify that properly with the email package.  For example,
consider a large CSV file.  I figure out the MIME type is text/csv.  Now
suppose I gzip the file before attaching it.  How would this code change to
specify the compression where "path" is now compressed?

    if maintype == 'text':
        fp = open(path)
        # Note: we should handle calculating the charset
        msg = MIMEText(fp.read(), _subtype=subtype)
        fp.close()

I guess I'm asking if I can have the Content-Type still be text/csv with
some other MIME header indicating the file is compressed.  If so, how do I
achieve that when attaching the compressed file to the message?

Thanks,

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/
    America's vaunted "free press" notwithstanding, story ideas that expose
    the unseemly side of actual or potential advertisers tend to fall by the
    wayside.  Not quite sure why.  -- Jim Thornton


From sasurve at gmail.com  Thu May 21 09:51:23 2009
From: sasurve at gmail.com (shruti surve)
Date: Thu, 21 May 2009 19:21:23 +0530
Subject: About dictionary in combobox in pygtk
Message-ID: <862e00220905210651t99a4664v390519ed8ab2748b@mail.gmail.com>

hi all,

My data has thousands of entries. I 'd like to feed the combobox with
dictionary.how to use dictionary in combobox?


Regards,
shruti surve
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From j.reid at mail.cryst.bbk.ac.uk  Thu May 21 09:53:40 2009
From: j.reid at mail.cryst.bbk.ac.uk (John Reid)
Date: Thu, 21 May 2009 14:53:40 +0100
Subject: LaTeXing python programs
In-Reply-To: <bdd7618d-53a4-48f8-bd0d-8a218d766c5a@n21g2000vba.googlegroups.com>
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>	<mailman.461.1242845176.8015.python-list@python.org>	<i8udnbmVfdskxYnXnZ2dnUVZ_tBi4p2d@rcn.net>
	<mailman.465.1242853870.8015.python-list@python.org>
	<bdd7618d-53a4-48f8-bd0d-8a218d766c5a@n21g2000vba.googlegroups.com>
Message-ID: <gv3md4$sp8$1@ger.gmane.org>



Edward Grefenstette wrote:
> I'm trying to figure out how to use pygments. Are there any good usage
> examples out there?

The documentation worked for me: http://pygments.org/docs/cmdline/

There is also a LaTeX package to call pygments at latex compilation time 
I forget what that is called though.



From gokhansever at gmail.com  Thu May 21 10:02:27 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Thu, 21 May 2009 09:02:27 -0500
Subject: Your Favorite Python Book
In-Reply-To: <gv3jkv$gc1$1@ger.gmane.org>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>
	<1242078761.3662.1314940065@webmail.messagingengine.com>
	<2dc0c81b0905111635x5a598d8bh74e4f7fa76e20b33@mail.gmail.com>
	<gv3jkv$gc1$1@ger.gmane.org>
Message-ID: <49d6b3500905210702t7aca1310r173e95e6c989e7b@mail.gmail.com>

Hello,

I received an autographed copy of CPP, 2nd Edition after joining to Safari's
"What is Python" webcast. They published the recorded session online as
well. Check
http://www.safaribooksonline.com/Corporate/DownloadAndResources/webcasts.php

As you will see from the lecture, he is a very motivated instructor. Mostly
likely you will want to grab a copy of the book after watching the condensed
Python introduction course.

G?khan


On Thu, May 21, 2009 at 8:06 AM, Esmail <ebonak at hotmail.com> wrote:

> Shawn Milochik wrote:
>
>> On Mon, May 11, 2009 at 5:52 PM,  <python at bdurham.com> wrote:
>>
>>> Sam,
>>>
>>> In no specific order (I brought them all):
>>>
>>> Wesley Chun's "Core Python Programming"
>>>
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>>>
>> I second the Wesley Chun recommendation wholeheartedly.
>>
>
> This book keeps getting mentioned, I'll have to check it out.
> Perhaps some of you can share what about it you like in
> particular.
>
> Thanks,
> Esmail
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From david.lyon at preisshare.net  Thu May 21 10:07:19 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Thu, 21 May 2009 10:07:19 -0400
Subject: dbfpy - cannot store new record
In-Reply-To: <4A153A10.1080906@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com>
Message-ID: <e1679f716165298e37047bf2985e4fde@preisshare.net>


Hi,

Try not opening the file in append mode (no "a+")

Inside the logic, there is already a seek to the end of the file
and the record counters at the start of the file need updating
too.

Regards

David


On Thu, 21 May 2009 13:25:04 +0200, Laszlo Nagy <gandalf at shopzeus.com>
wrote:
> Given this example program:
> 
> import dbfpy
> def dbf_open(tblname):
>     fpath = os.path.join(local.DB_DIR,tblname)
>     f = file(fpath,"ab+")
>     f.seek(0)
>     tbl = dbf.Dbf(f)
>     return tbl
> 
> tbl = dbf_open("partners.dbf")
> rec = tbl.newRecord()
> rec["FIELDNAME1"] = 1
> rec["FIELDNAME2"] = "Somebody"
> rec.store()
> tbl.close()
> 
> I get no exception, no error etc. But the new record is NOT appended to 
> the table. What is wrong here?
> 
> Thanks,
> 
>    Laszlo


From gandalf at shopzeus.com  Thu May 21 10:25:12 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Thu, 21 May 2009 16:25:12 +0200
Subject: dbfpy - cannot store new record
In-Reply-To: <e1679f716165298e37047bf2985e4fde@preisshare.net>
References: <4A153A10.1080906@shopzeus.com>
	<e1679f716165298e37047bf2985e4fde@preisshare.net>
Message-ID: <4A156448.9060902@shopzeus.com>

David Lyon ?rta:
> Hi,
>
> Try not opening the file in append mode (no "a+")
>
> Inside the logic, there is already a seek to the end of the file
> and the record counters at the start of the file need updating
> too.
>   
The first thing I tried is to use a filename instead of the file object 
but it didn't work. Then I just tried "r+b" and it worked fine. Thank you!

BTW here is ist constructor:

    def __init__(self, f, readOnly=False, new=False, ignoreErrors=False):
        """Initialize instance.

        Arguments:
            f:
                Filename or file-like object.
            new:
                True if new data table must be created. Assume
                data table exists if this argument is False.
            readOnly:
                if ``f`` argument is a string file will
                be opend in read-only mode; in other cases
                this argument is ignored. This argument is ignored
                even if ``new`` argument is True.
            headerObj:
                `header.DbfHeader` instance or None. If this argument
                is None, new empty header will be used with the
                all fields set by default.
            ignoreErrors:
                if set, failing field value conversion will return
                ``INVALID_VALUE`` instead of raising conversion error.

        """
        if isinstance(f, basestring):
            # a filename
            self.name = f
            if new:
                # new table (table file must be
                # created or opened and truncated)
                self.stream = file(f, "w+b")
            else:
                # tabe file must exist
                self.stream = file(f, ("r+b", "rb")[bool(readOnly)])
        else:
            # a stream
            self.name = getattr(f, "name", "")
            self.stream = f


I have never seen such a construct before. Index a tuple with a boolean???

                self.stream = file(f, ("r+b", "rb")[bool(readOnly)])
Best,

   Laszlo



From gert.cuykens at gmail.com  Thu May 21 10:47:24 2009
From: gert.cuykens at gmail.com (gert)
Date: Thu, 21 May 2009 07:47:24 -0700 (PDT)
Subject: join two selects
Message-ID: <bcf86768-d0e0-4f67-a391-f0dbacba074a@h23g2000vbc.googlegroups.com>

I am trying to figure out how to join two selects ?

SELECT * FROM search
SELECT eid, SUM(pnt) AS total_votes FROM vote

CREATE TABLE votes (
    eid  INTEGER PRIMARY KEY,
    uid  VARCHAR(64),
    pnt  INETEGER DEFAULT 0,
);

CREATE TABLE search (
    eid  INTEGER PRIMARY KEY,
    txt  VARCHAR(64),
    end  DATETIME
);

so the result would be a table that looks like this

["eid", "txt", "end", "total_votes"]


From mail at timgolden.me.uk  Thu May 21 10:54:22 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 21 May 2009 15:54:22 +0100
Subject: join two selects
In-Reply-To: <bcf86768-d0e0-4f67-a391-f0dbacba074a@h23g2000vbc.googlegroups.com>
References: <bcf86768-d0e0-4f67-a391-f0dbacba074a@h23g2000vbc.googlegroups.com>
Message-ID: <4A156B1E.9050708@timgolden.me.uk>

gert wrote:
> I am trying to figure out how to join two selects ?
> 
> SELECT * FROM search
> SELECT eid, SUM(pnt) AS total_votes FROM vote
> 
> CREATE TABLE votes (
>     eid  INTEGER PRIMARY KEY,
>     uid  VARCHAR(64),
>     pnt  INETEGER DEFAULT 0,
> );
> 
> CREATE TABLE search (
>     eid  INTEGER PRIMARY KEY,
>     txt  VARCHAR(64),
>     end  DATETIME
> );
> 
> so the result would be a table that looks like this
> 
> ["eid", "txt", "end", "total_votes"]

That's what's known technically as a join:

SELECT
  sea.eid,
  sea.txt,
  sea.end,
  SUM (vot.pnt) AS total_votes
FROM
  search AS sea
JOIN votes AS vot ON
  vot.eid = sea.eid
GROUP BY
  sea.eid,
  sea.txt,
  sea.end,


(Guessing the join condition from the column names)

TJG


From google at mrabarnett.plus.com  Thu May 21 11:00:34 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 16:00:34 +0100
Subject: dbfpy - cannot store new record
In-Reply-To: <4A156448.9060902@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com>	<e1679f716165298e37047bf2985e4fde@preisshare.net>
	<4A156448.9060902@shopzeus.com>
Message-ID: <4A156C92.7040904@mrabarnett.plus.com>

Laszlo Nagy wrote:
[snip]
> 
> I have never seen such a construct before. Index a tuple with a boolean???
> 
>                self.stream = file(f, ("r+b", "rb")[bool(readOnly)])
> 
Python originally didn't have Boolean; it used 0 for false and 1 for
true. When the Boolean class was added it was subclassed from int in
order not to break existing code, so False and True can be used like 0
and 1 respectively:

 >>> False == 0
True
 >>> True == 1
True
 >>> False + 1
1
 >>> True + 1
2

Therefore a_list[False] is the same as a_list[0] and a_list[True] is the
same as a_list[1].


From lie.1296 at gmail.com  Thu May 21 11:08:57 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 21 May 2009 15:08:57 GMT
Subject: Performance java vs. python
In-Reply-To: <ViaRl.95042$Ku5.64377@newsfe10.ams2>
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com>
	<gv1nor$10uu$1@adenine.netfront.net>
	<Xns9C1262ED6DA67duncanbooth@127.0.0.1>
	<ViaRl.95042$Ku5.64377@newsfe10.ams2>
Message-ID: <d8eRl.12564$y61.1802@news-server.bigpond.net.au>

Sion Arrowsmith wrote:
>> OTOH, I consider it a productive day if I end up with fewer lines of code 
>> than I started with.
> 
> A friend once justified a negative LOC count as being the sign of a
> good day with the following observation:
> 
> Code that doesn't exist contains no bugs.
> Code that doesn't exist takes no time to execute.
> Code that doesn't exist takes up no space.
> Code that doesn't exist doesn't need maintenance.

Why not call a day productive when the UnitTest that passed has 
increased or stayed constant with reduced LOC.

> Once, when faced with a rather hairy problem that client requirements
> dictated a pure Java solution for, I coded up a fully functional
> prototype in Python to get the logic sorted out, and then translated
> it. Even given the optimisations of manual translation, and being
> able to dispose of one portion of the Python which Java supplied the
> functionality for out of the box (thread timeout, I think it was),
> the code grew by 200%. That was a very unproductive day.

Jython ?


From psaffrey at googlemail.com  Thu May 21 11:21:22 2009
From: psaffrey at googlemail.com (psaffrey at googlemail.com)
Date: Thu, 21 May 2009 08:21:22 -0700 (PDT)
Subject: Overlapping region resolution
Message-ID: <444613e9-783e-4cd8-b801-1ea14ff5fb19@x6g2000vbg.googlegroups.com>

This may be an algorithmic question, but I'm trying to code it in
Python, so...

I have a list of pairwise regions, each with an integer start and end
and a float data point. There may be overlaps between the regions. I
want to resolve this into an ordered list with no overlapping
regions.

My initial solution was to sort the list by the start point, and then
compare each adjacent region, clipping any overlapping section in
half. I've attached code at the bottom. Unfortunately, this does not
work well if you have sections that have three or more overlapping
regions.

A more general solution is to work out where all the overlaps are
before I start. Then I can break up the region space based on what
regions overlap each section and take averages of all the datapoints
that are present in a particular section. Devising an algorithm to do
this is making my brain hurt. Any ideas?

Peter


# also validates the data
def clipRanges(regions):
	for i in range(len(regions) - 1):
		thispoint = regions[i]
		nextpoint = regions[i+1]
		assert thispoint[1] > thispoint[0] and	nextpoint[1] > nextpoint[0],
"point read not valid"
		thisend = thispoint[1]
		nextstart = nextpoint[0]
		diff = thisend - nextstart
		# a difference of zero is too close together
		if diff > -1:
			if diff % 2 == 1:
				diff += 1
			correction = diff / 2
			newend = thisend - correction
			newstart = newend + 1
			assert newend > thispoint[0] and nextpoint[1] > newstart, "new
range not valid!"
			newthispoint = (thispoint[0], newend, thispoint[2])
			newnextpoint = (newstart, nextpoint[1], nextpoint[2])
			regions[i] = newthispoint
			regions[i+1] = newnextpoint
	return regions

regions = [ (0,10,2.5), (12,22,3.5), (15,25,1.2), (23, 30,0.01), (27,
37,1.23), (30, 35, 1.45) ]
regions2 = [ (0,10,2.5), (1,11,1.1), (2,12,1.2) ]

# works fine, produces [(0, 10, 2.5), (12, 18, 3.5), (19, 24, 1.2),
(25, 28, 0.01), (29, 33, 1.23), (34, 35, 1.45)]
print clipRanges(regions)
# violates "new range not valid" assertion
print clipRanges(regions2)


From nick at craig-wood.com  Thu May 21 11:29:55 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Thu, 21 May 2009 10:29:55 -0500
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<pan.2009.05.19.09.24.29@REMOVE.THIS.cybersource.com.au>
	<bemdncWkNYTJEo_XnZ2dnUVZ_gZi4p2d@posted.usinternet>
	<pan.2009.05.20.03.29.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <slrnh1asoa.9ev.nick@irishsea.home.craig-wood.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
>  On Tue, 19 May 2009 05:52:04 -0500, Grant Edwards wrote:
> 
> > On 2009-05-19, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>
> > wrote:
> >> On Mon, 18 May 2009 02:27:06 -0700, jeremy wrote:
> >>
> >>> Let me clarify what I think par, pmap, pfilter and preduce would mean
> >>> and how they would be implemented.
> >> [...]
> >>
> >> Just for fun, I've implemented a parallel-map function, and done a
> >> couple of tests. Comments, criticism and improvements welcome!
> > 
> > My only comment would be that your "slow function" might not be a very
> > simulation for the general-case, since it uses time.sleep() which
> > releases the GIL:
> 
> 
>  I didn't expect my code to magically overcome fundamental limitations of 
>  the CPython interpreter :)
> 
> 
> 
> >> def f(arg):  # Simulate a slow function.
> >>     time.sleep(0.5)
> >>     return 3*arg-2
> > 
> > Any Python function that isn't calling a library function written in C
> > that releases the GIL won't show any speedup will it?
> 
>  Not necessarily. Here's another function, that uses a loop instead of 
>  sleep.
> 
>  def g(arg, SIZE=8*10**6):
>      # Default SIZE is chosen so that on my machine, the loop 
>      # takes approximately 0.5 second.
>      for x in xrange(SIZE):
>          pass
>      return 3*arg-2
> 
> 
> >>> setup = 'from __main__ import pmap, g; data = range(50)'
> >>> min(Timer('map(g, data)', setup).repeat(repeat=5, number=3))
>  65.093590974807739
> >>> min(Timer('pmap(g, data)', setup).repeat(repeat=5, number=3))
>  20.268381118774414

I don't think that can be right - that shows python working without
the GIL contention.  So unless you ran it under IronPython?

Here is what happens when I run it under CPython 2.5 on my dual core
laptop.  I made SIZE=10**6 because I got bored of waiting ;-)

map
9.85280895233
pmap
28.4256689548

So the pmap took nearly 3 times as long.  I expect this is because the
task was divided into 5 sections each competing madly for the GIL.

I ran the same script under the latest jython beta which was very
interesting! pmap showing a slight improvement, and faster than
cPython!

$ jython2.5rc2/jython pmap.py
map
6.242000103
pmap
5.88800001144

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From Ron.Barak at lsi.com  Thu May 21 11:42:41 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Thu, 21 May 2009 16:42:41 +0100
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <mailman.1830.1242879003.8014.python-list@python.org>
References: <mailman.1830.1242879003.8014.python-list@python.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>

Hi,

I need to read the end of a 20 MB gzip archives (To extract the date from the last line of a a gzipped log file).
The solution I have below takes noticeable time to reach the end of the gzip archive.

Does anyone have a faster solution to read the last line of a gzip archive ?

Thanks,
Ron.

#!/usr/bin/env python

import gzip

path = "./a/20/mb/file.tgz"

in_file = gzip.open(path, "r")
first_line = in_file.readline()
print "first_line ==",first_line
in_file.seek(-500)
last_line = in_file.readlines()[-1]
print "last_line ==",last_line



-------------- next part --------------
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From Lacrima.Maxim at gmail.com  Thu May 21 11:52:00 2009
From: Lacrima.Maxim at gmail.com (Lacrima)
Date: Thu, 21 May 2009 08:52:00 -0700 (PDT)
Subject: Simple question about accessing instance properties.
Message-ID: <e9e7b903-6d4f-4762-93c2-1bf5148588d8@z9g2000yqi.googlegroups.com>

Hello!

I think I have a very simple question, but I can't understand how to
access object properties in a way described below.
For example I have an instance of any class:

>>> class Person:
	def __init__(self):
		self.name = 'John'
		self.email = 'john at example.com'
		self.phone = '3453454'
>>> person = Person()

Then I have a list of person's properties represented as strings:
>>> prop_list = ['name', 'email', 'phone']

And my question is how to access person's properties using prop_list?
Do I have to somehow convert 'name', 'email', 'phone'?

With regards,
Max.


From gandalf at shopzeus.com  Thu May 21 11:53:38 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Thu, 21 May 2009 17:53:38 +0200
Subject: dbfpy - cannot store new record
In-Reply-To: <4A153A10.1080906@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com>
Message-ID: <4A157902.9080507@shopzeus.com>

Here is the next problem. For boolean/logical fields, I can set their 
value to True/False easily. However, setting NULL seems impossible:

rec = tbl.newRecord()
rec["SOMEFIELD1"] = True # Works fine
rec["SOMEFIELD2"] = False # Works fine
rec["SOMEFIELD3"] = None # Will store False
rec["SOMEFIELD3"] = 0 # Will store False
rec["SOMEFIELD3"] = "" # Will store False
rec["SOMEFIELD3"] = chr(32) # Will store False
rec["SOMEFIELD3"] = chr(0) # Will store False
rec.store()

Strange thing: if I do not set the value of a numeric field, it becomes 
NULL. The same thing I cannot do for logical fields: if I do not set the 
value of a logical field, it becomes an invalid value, denoted with a 
question mark.

Any ideas?

Thanks,

   Laszlo



From google at mrabarnett.plus.com  Thu May 21 11:54:47 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 16:54:47 +0100
Subject: Overlapping region resolution
In-Reply-To: <444613e9-783e-4cd8-b801-1ea14ff5fb19@x6g2000vbg.googlegroups.com>
References: <444613e9-783e-4cd8-b801-1ea14ff5fb19@x6g2000vbg.googlegroups.com>
Message-ID: <4A157947.3020005@mrabarnett.plus.com>

psaffrey at googlemail.com wrote:
> This may be an algorithmic question, but I'm trying to code it in
> Python, so...
> 
> I have a list of pairwise regions, each with an integer start and end
> and a float data point. There may be overlaps between the regions. I
> want to resolve this into an ordered list with no overlapping
> regions.
> 
> My initial solution was to sort the list by the start point, and then
> compare each adjacent region, clipping any overlapping section in
> half. I've attached code at the bottom. Unfortunately, this does not
> work well if you have sections that have three or more overlapping
> regions.
> 
> A more general solution is to work out where all the overlaps are
> before I start. Then I can break up the region space based on what
> regions overlap each section and take averages of all the datapoints
> that are present in a particular section. Devising an algorithm to do
> this is making my brain hurt. Any ideas?
> 
> Peter
> 
> 
> # also validates the data
> def clipRanges(regions):
> 	for i in range(len(regions) - 1):
> 		thispoint = regions[i]
> 		nextpoint = regions[i+1]
> 		assert thispoint[1] > thispoint[0] and	nextpoint[1] > nextpoint[0],
> "point read not valid"
> 		thisend = thispoint[1]
> 		nextstart = nextpoint[0]
> 		diff = thisend - nextstart
> 		# a difference of zero is too close together
> 		if diff > -1:
> 			if diff % 2 == 1:
> 				diff += 1
> 			correction = diff / 2
> 			newend = thisend - correction
> 			newstart = newend + 1
> 			assert newend > thispoint[0] and nextpoint[1] > newstart, "new
> range not valid!"
> 			newthispoint = (thispoint[0], newend, thispoint[2])
> 			newnextpoint = (newstart, nextpoint[1], nextpoint[2])
> 			regions[i] = newthispoint
> 			regions[i+1] = newnextpoint
> 	return regions
> 
> regions = [ (0,10,2.5), (12,22,3.5), (15,25,1.2), (23, 30,0.01), (27,
> 37,1.23), (30, 35, 1.45) ]
> regions2 = [ (0,10,2.5), (1,11,1.1), (2,12,1.2) ]
> 
> # works fine, produces [(0, 10, 2.5), (12, 18, 3.5), (19, 24, 1.2),
> (25, 28, 0.01), (29, 33, 1.23), (34, 35, 1.45)]
> print clipRanges(regions)
> # violates "new range not valid" assertion
> print clipRanges(regions2)

Is the upper bound of a range inclusive or exclusive? If it's exclusive
(like in Python) then it's empty only if lower == upper, and an overlap
occurs only if first.upper > second.lower (and you can have newstart ==
newend in your code).


From google at mrabarnett.plus.com  Thu May 21 12:01:53 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 17:01:53 +0100
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
Message-ID: <4A157AF1.9020104@mrabarnett.plus.com>

Barak, Ron wrote:
> Hi,
>  
> I need to read the end of a 20 MB gzip archives (To extract the date 
> from the last line of a a gzipped log file).
> The solution I have below takes noticeable time to reach the end of the 
> gzip archive.
>  
> Does anyone have a faster solution to read the last line of a gzip archive ?
>  
> Thanks,
> Ron.
>  
> #!/usr/bin/env python
>  
> import gzip
>  
> path = "./a/20/mb/file.tgz"
>  
> in_file = gzip.open(path, "r")
> first_line = in_file.readline()
> print "first_line ==",first_line
> in_file.seek(-500)
> last_line = in_file.readlines()[-1]
> print "last_line ==",last_line
> 
It takes a noticeable time to reach the end because, well, the data is
compressed! The compression method used requires the preceding data to
be read first.


From google at mrabarnett.plus.com  Thu May 21 12:04:53 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 17:04:53 +0100
Subject: Simple question about accessing instance properties.
In-Reply-To: <e9e7b903-6d4f-4762-93c2-1bf5148588d8@z9g2000yqi.googlegroups.com>
References: <e9e7b903-6d4f-4762-93c2-1bf5148588d8@z9g2000yqi.googlegroups.com>
Message-ID: <4A157BA5.5060008@mrabarnett.plus.com>

Lacrima wrote:
> Hello!
> 
> I think I have a very simple question, but I can't understand how to
> access object properties in a way described below.
> For example I have an instance of any class:
> 
>>>> class Person:
> 	def __init__(self):
> 		self.name = 'John'
> 		self.email = 'john at example.com'
> 		self.phone = '3453454'
>>>> person = Person()
> 
> Then I have a list of person's properties represented as strings:
>>>> prop_list = ['name', 'email', 'phone']
> 
> And my question is how to access person's properties using prop_list?
> Do I have to somehow convert 'name', 'email', 'phone'?
> 
 >>> getattr(person, "name")
'John'


From Lacrima.Maxim at gmail.com  Thu May 21 12:14:57 2009
From: Lacrima.Maxim at gmail.com (Lacrima)
Date: Thu, 21 May 2009 09:14:57 -0700 (PDT)
Subject: Simple question about accessing instance properties.
References: <e9e7b903-6d4f-4762-93c2-1bf5148588d8@z9g2000yqi.googlegroups.com>
	<mailman.513.1242921896.8015.python-list@python.org>
Message-ID: <564b6a40-a201-42d7-bc1a-0a6d087b5a67@g19g2000yql.googlegroups.com>

On May 21, 7:04?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Lacrima wrote:
> > Hello!
>
> > I think I have a very simple question, but I can't understand how to
> > access object properties in a way described below.
> > For example I have an instance of any class:
>
> >>>> class Person:
> > ? ?def __init__(self):
> > ? ? ? ? ? ?self.name = 'John'
> > ? ? ? ? ? ?self.email = 'j... at example.com'
> > ? ? ? ? ? ?self.phone = '3453454'
> >>>> person = Person()
>
> > Then I have a list of person's properties represented as strings:
> >>>> prop_list = ['name', 'email', 'phone']
>
> > And my question is how to access person's properties using prop_list?
> > Do I have to somehow convert 'name', 'email', 'phone'?
>
> ?>>> getattr(person, "name")
> 'John'

Hi!
Thanks a lot!!!
That's so simple!

With regards,
Max.


From google at mrabarnett.plus.com  Thu May 21 12:19:25 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 17:19:25 +0100
Subject: dbfpy - cannot store new record
In-Reply-To: <4A157902.9080507@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com> <4A157902.9080507@shopzeus.com>
Message-ID: <4A157F0D.9070400@mrabarnett.plus.com>

Laszlo Nagy wrote:
> Here is the next problem. For boolean/logical fields, I can set their 
> value to True/False easily. However, setting NULL seems impossible:
> 
> rec = tbl.newRecord()
> rec["SOMEFIELD1"] = True # Works fine
> rec["SOMEFIELD2"] = False # Works fine
> rec["SOMEFIELD3"] = None # Will store False
> rec["SOMEFIELD3"] = 0 # Will store False
> rec["SOMEFIELD3"] = "" # Will store False
> rec["SOMEFIELD3"] = chr(32) # Will store False
> rec["SOMEFIELD3"] = chr(0) # Will store False
> rec.store()
> 
> Strange thing: if I do not set the value of a numeric field, it becomes 
> NULL. The same thing I cannot do for logical fields: if I do not set the 
> value of a logical field, it becomes an invalid value, denoted with a 
> question mark.
> 
Have you tried -1?

Can you read a DBF file created by the application (dBase, or whatever)
and see what it uses?


From norseman at hughes.net  Thu May 21 12:45:21 2009
From: norseman at hughes.net (norseman)
Date: Thu, 21 May 2009 09:45:21 -0700
Subject: popen - reading strings - constructing a list from the strings
In-Reply-To: <4A144E67.3050003@mrabarnett.plus.com>
References: <fe9846b90905200817y5b476835q17c66f782e931b27@mail.gmail.com>	<fe9846b90905201053l25fe0ebt47907de64a80eb88@mail.gmail.com>
	<4A144E67.3050003@mrabarnett.plus.com>
Message-ID: <4A158521.2030703@hughes.net>

MRAB wrote:
> Aytekin Vargun wrote:
>> First of all,
>> Thanks for the suggestions, MRAB and norseman. "split()" was what I 
>> was looking for. Now I have a follow up question. In my application I 
>> create radio buttons in a frame. These radio buttons are constructed 
>> whenever a button is clicked. Therefore the list of items are 
>> dynamically changing.
>>
>> What I want to do is to remove the current radio buttons and then 
>> recreate a new set of radio buttons using a new string list. I could 
>> not see a command for deleting or removing a set of radio buttons. I 
>> use Tkinter.
>>
>> I can provide more details.
>> Thanks a lot.
>>
>> PS: I apologize if this creates a new thread. I am new to the list.
>> Aytekin
>>
> I have no idea whether this is possible. I'd just create a new frame. I
> hope you're not trying to add and remove buttons on a dialog while it's
> open; having a dialog radically change its appearance while the user is
> watching would, IMHO, be very bad! :-)
==========================
"... be very bad.." NOPE.
When it's done right, it's quite an eye catcher.

Actually I use that very technique to great advantage.

             (excerpts from non-existent "How to Build a Control Panel")
Leave space for the changing frame in the root or topwindow.
define a frame to fit that space.
define the groups of buttons (static or dynamic) with each using the
   above frame as their home.  (many to one relation)
   put each button group in a def ...() of it's own.
   call the appropriate as needed


example:
             (to call the button(s))
if condition.....
  DispSubI()
else:
  DispSubNB()  #

where:
            (the content changing frame)
  def SubClas():
     try:
       frameSub.destroy()
     except:
       pass
     frameSub =   define your
     .             disposable frame
     .              template here
     label.pack()
     return frameSub


            (the buttons)
----------------------------------------------------------
   #
   #                           I - IDLE
   def DispSubI():
     frameSub= SubClas()
     I_SUB = [
       (" 1", "Land not cropped this and/or last season"),
       (" 2", "New lands being prepared for crop production"),
     ]
     #
     # ---------------------- BUTTONS
     #
     SubI= []
     for mode, text in I_SUB:
       c = Radiobutton(frameSub, text=text, indicatoron=0,
             variable=SubVal, value=mode, command=getSub)
       SubI.append(c)
       c.pack()
   #
   #
   # ----------------------------------------------------------
   #
   #                     NB - BARREN AND WASTELAND
   def DispSubNB():
     frameSub= SubClas()
     NB_SUB = [
       ("**", "None"),
       (" 1", "Dry stream channels"),
       (" 2", "Mine Tailing"),
       (" 3", "Barren land"),
       (" 4", "Salt flats"),
       (" 5", "Sand dunes"),
     ]
     #
     # ---------------------- BUTTONS
     #
     SubNB= []
     for mode, text in NB_SUB:
       c = Radiobutton(frameSub, text=text, indicatoron=0,
             variable=SubVal, value=mode, command=getSub)
       SubNB.append(c)
       c.pack()
   #
   #
   # ----------------------------------------------------------


SubWho can be a volatile list - change before calling buttons.


Simplicity itself.



Today is: 20090521
portions are from actual code
Python 2.5.2 and included Tkinter
Linux Slackware 10.2  (same source runs on Win XP PRO)

Steve


From sion at viridian.paintbox  Thu May 21 12:56:40 2009
From: sion at viridian.paintbox (Sion Arrowsmith)
Date: Thu, 21 May 2009 16:56:40 GMT
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com>
	<Xns9C1262ED6DA67duncanbooth@127.0.0.1>
	<ViaRl.95042$Ku5.64377@newsfe10.ams2>
	<d8eRl.12564$y61.1802@news-server.bigpond.net.au>
Message-ID: <cJfRl.168476$aj5.161473@newsfe16.ams2>

Lie Ryan  <lie.1296 at gmail.com> wrote:
>Sion Arrowsmith wrote:
>> Once, when faced with a rather hairy problem that client requirements
>> dictated a pure Java solution for, I coded up a fully functional
>> prototype in Python to get the logic sorted out, and then translated
>> it. [And it wasn't pleasant.]
>
>Jython ?

This was back during Jython's wilderness years (barely maintained at
2.1 while the rest of us were on 2.3, or something like that. Mind
you, you could argue it's four versions behind at the moment.) Plus, I
was the only Python-head in the company just then. Plus, I meant that
"client requirements dictated a pure Java solution": they required the
ability to do a code audit. It's amazing the number and variety of
people who've drunk the Java Kool-Aid.

-- 
\S

   under construction



From ebonak at hotmail.com  Thu May 21 14:05:49 2009
From: ebonak at hotmail.com (Esmail)
Date: Thu, 21 May 2009 14:05:49 -0400
Subject: Your Favorite Python Book
In-Reply-To: <49d6b3500905210702t7aca1310r173e95e6c989e7b@mail.gmail.com>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>	<50697b2c0905111445w40f53bdkdb7dd731ce77a919@mail.gmail.com>	<1242078761.3662.1314940065@webmail.messagingengine.com>	<2dc0c81b0905111635x5a598d8bh74e4f7fa76e20b33@mail.gmail.com>	<gv3jkv$gc1$1@ger.gmane.org>
	<49d6b3500905210702t7aca1310r173e95e6c989e7b@mail.gmail.com>
Message-ID: <4A1597FD.1010007@hotmail.com>

G?khan SEVER wrote:
> Hello,
> 
> I received an autographed copy of CPP, 2nd Edition after joining to 
> Safari's "What is Python" webcast. They published the recorded session 
> online as well. Check  
> http://www.safaribooksonline.com/Corporate/DownloadAndResources/webcasts.php
> 
> As you will see from the lecture, he is a very motivated instructor. 
> Mostly likely you will want to grab a copy of the book after watching 
> the condensed Python introduction course.
> 

Hi G?khan

This looks interesting .. I have access to Safari books, but for some
reason I can't access this webcast via it .. so perhaps I have to sign
up for a trial membership for this? I'd prefer to do this w/o .. so I
guess I'll poke around a bit more. Thanks for the lead,

Esmail



From mohammed.abosalim at gmail.com  Thu May 21 14:11:47 2009
From: mohammed.abosalim at gmail.com (abosalim)
Date: Thu, 21 May 2009 11:11:47 -0700 (PDT)
Subject: SpellChecker
References: <e48864a4-1d8c-4239-8a8d-f19b85bd51ee@f16g2000vbf.googlegroups.com>
	<mailman.434.1242812253.8015.python-list@python.org>
Message-ID: <65d92f68-3aed-44ba-9f32-e270829edf1a@l12g2000yqo.googlegroups.com>

On May 20, 12:37?pm, Mike Kazantsev <mike_kazant... at fraggod.net>
wrote:
> abosalim wrote:
> > I used this code.It works fine,but on word not whole text.I want to
> > extend this code to correct
> > text file not only a word,but i don't know.If you have any help,please
> > inform me.
> ...
> > def correct(word):
> > ? ? candidates = known([word]) or known(edits1(word)) or known_edits2
> > (word) or [word]
> > ? ? return max(candidates, key=lambda w: NWORDS[w])
>
> Here I assume that "word" is any string consisting of letters, feel free
> to add your own check in place of str.isalpha, like word length or case.
> Note that simple ops like concatenation work much faster with buffers
> than str / unicode.
>
> ? text = 'some text to correct (anything, really)'
> ? result = buffer('')
>
> ? word, c = buffer(''), ''
> ? for c in text:
> ? ? if c.isalpha(): word += c
> ? ? else:
> ? ? ? if word:
> ? ? ? ? result += correct(word)
> ? ? ? ? word = buffer('')
> ? ? ? result += c
>
> --
> Mike Kazantsev // fraggod.net
>
> ?signature.asc
> < 1KViewDownload
Thanks a lot


From gabriel.hasbun at gmail.com  Thu May 21 14:14:25 2009
From: gabriel.hasbun at gmail.com (Gasto)
Date: Thu, 21 May 2009 11:14:25 -0700 (PDT)
Subject: What do you think of ShowMeDo
References: <b6671f88-bc04-42eb-aad1-5b212bcab1ef@z23g2000prd.googlegroups.com>
	<87tz48s7hm.fsf@benfinney.id.au>
	<52d28fba-ebf7-4bfb-b568-64304da650d5@w31g2000prd.googlegroups.com>
	<pan.2009.04.29.06.27.10@REMOVE.THIS.cybersource.com.au>
Message-ID: <6d0e35d3-e2b7-42bc-a5fc-3338d639470a@g19g2000vbi.googlegroups.com>

Smart ass talking.

Why don't you do a thing then. Following an analogy of what you write.

Put youself in Kyran's and Ian's shoes.

*
You create a website to help people learn open source software and
open source programming. You start off with a few dozen of videos.

People start coming to the site. There are expenses to be dealt with
so a Club membership is created to deal with the expenses of site
maintenance and server bandwith, etc. You create a bunch of Python
videos, you suggest other authors to contribute, the site gets crowded
with good and free ('free' as in free to draw a gun and shoot at your
legs) and informative tutorial videos. That site gets praises by
appreciative people. The site gets a major update and server change.

Unappreciative people start writing stupid feedback in Usenet
comp.lang.python . You address the reasons why ShowMeDo has its faults
(like any other site), namely one man for the whole site. Idiots keep
complaining about the UI being 'unreachable' (while the more adequate
term would be 'improvable')
*

I guess that if you had created something, purely under philanthropic
purpose, you'd understand at first glance. But what could be expected
from a sewer rat that suggests to pay 10ths of thousands of dollars of
UI experts on a philanthropic site?

Go sell your *ss for that price, if you are so capitalism hungry. And
contemplate appreciative people get smarter from ShowMeDo while your
at it.

On Apr 29, 12:27?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Tue, 28 Apr 2009 21:56:08 -0700, kyran wrote:
> > I stumbled across this thread while typing a speculative 'showmedo' in
> > google, as you do while taking a break on a (very) late Tuesday evening.
> > To declare my interest, as things stand I amShowmedoCEO, CTO,
> > boywhomakesthetea etc.. I'm not going to plug anything specific and
> > normally let these things go but it's comp.lang.python and a
> > misconception is a misconception. Besides which, every now and then an
> > attitude really grates.
>
> Yeah, it really sucks when you spend time and effort to build something,
> and then discover that it isn't what people want.
>
> Or at least some people.
>
> [...]
>
> > As for the author immediately above, I think he fails his own test of
> > prudence. There are rather blindingly obvious download links below each
> > video.
>
> Perhaps you should forget your preconceptions and take a long, hard look
> at the site with the eyes of a first time visitor.
>
> As a first time visitor, this is what I see:
>
> * A bunch of "stuff" all over the front page. My eye is drawn to a bunch
> of thumbnails on the right hand side, which look somewhat vaguely what
> I'd see on YouTube. So I click on a thumbnail, expecting to see a video,
> but instead I get taken to a page with no video or download link. I think
> this is what you call a "series", but at first the page just looks broken
> to me -- where's the video?
>
> * Since I'm unusually interested in your site, and have nothing better to
> do, I click on the series heading, and go to another page. This one does
> have a download link, and a broken "click here to play" icon. Oh well,
> I'm used to video sites being broken on everything but IE, or requiring
> Javascript, or both. So I click on the download link, and learn that you
> require a login. Do I care enough about your content to create Yet
> Another Damn Login Identity? No.
>
> (And yet I care enough to spend 20 minutes explaining you how you could
> improve your site. Fancy that. That's because if you improve your site,
> it could be useful to me, but if I create a login account, I've got the
> burden of dealing with yet another login account.)
>
> * Since I'm feeling especially enthusiastic, I go back to the home page,
> and click a link under the "Popular Paths" heading in the "Blog roll".
> (You seem to be using the term blog roll to mean something completely
> different to the way it is used in virtually every blogging site I've
> ever seen.) This takes me to an even more complicated page showing a
> "Path", filled with things that look like clickable buttons but aren't,
> and thumbnails that at first glance look identical. If I spend a couple
> of minutes inspecting them closely and mousing over them, I see that the
> *left* hand side of the thumbnail is the author and the *right* hand side
> is something else.
>
> (No doubt some clever PHP programmer thought he was being clever to come
> up with that UI abomination.)
>
> * I see *one* thumbnail that has a "Click to play" icon next to it. None
> of the others appear to be videos. There is no download link. I give up,
> and decide that your website's UI is too large a barrier for me to bother
> with it any further.
>
> > All that being said, I do feel the need to make that point that we have
> > generated 350 odd completely free video-tutorials for the Python
> > community, including some truly inspirational demonstrations, if the
> > feedback is anything to go by. The site has been refined over time and
> > is at least striving constantly to improve. But some people will always
> > focus only on the negatives. They are few and far between but
> > occasionally, during those long, dark teatimes of the soul, it does make
> > one wonder why one bothers. You provide them with free videos, make no
> > claim upon them and all they do is moan that the format is wrong or
> > their time too precious to waste on a non-mandatory signing- up, though
> > not so precious they can't take time out of their day to whinge about it
> > in a group posting. I think it's the kind of attitude that kills the
> > spirit of FOSS stone-dead.
>
> You think that FOSS is under threat because people are willing to give
> you feedback that your use of non-FOSS software (Flash) is inconvenient
> to them? Oh dear.
>
> For every person who takes the time to write about it, probably one
> hundred people equally dislike your site but just walk away and never
> come back. You should be dancing for joy that Ben gave you valuable
> feedback about his user experience, instead of just walking away. Some
> companies pay tens of thousands of dollars to hire UI consultants to make
> sure their website is usable by first-time visitors, and that's excluding
> development costs. I've just given you twenty minutes of my time writing
> up my experiences for free. Is that enough in the spirit of FOSS for you?
>
> --
> Steven



From norseman at hughes.net  Thu May 21 14:33:41 2009
From: norseman at hughes.net (norseman)
Date: Thu, 21 May 2009 11:33:41 -0700
Subject: reseting an iterator
In-Reply-To: <gv1q69$muh$1@ger.gmane.org>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
	<gv1q69$muh$1@ger.gmane.org>
Message-ID: <4A159E85.1070400@hughes.net>

Terry Reedy wrote:
> Jan wrote:
>> Wouldn't it be easy for Python to implement generating functions so
>> that the iterators they return are equipped with a __reset__() method?
> 
> No.  Such a method would have to poke around in the internals of the 
> __next__ function in implementation specific ways.  The values used to 
> initialize that function might have changed, so 'reset' would have to be 
> carefully defined.
> 
> def squares():
>   start = int(input("enter starting int:"))
>   stop  = int(input("enter stopping int"))
>   for i in range(start,stop):
>     yield i*i
> 
> What does 'reset' mean here?

I don't understand.  Why would one use a reset here in the first place? 
One simply re-runs this.  The output could be collected into a list, 
which one might want to reset, re-list.
bad example?


> 
>> Here is the context of this question.
>>
>> Python documentation defines  a "iterator" as an object ITERATOR
>> having methods __next__() and __iter__() such that the call
>> ITERATOR.__iter__() returns the object itself, 
> 
> This is so that 'iter(iterator) is iterator', 

You would do well to clarify the previous line.
To me it is the same as   a face is a face
function(x) is x      six of one, half dozen of the other
gobble-d-goop, double talk     so what?
Not trying to pick a fight - just pointing out the need for some 
clarity.  Had a math teacher that proclaimed any function(x) that only 
returned x was (hummm can't print that here).  Something like useless.


so that functions can take
> either an interable or iterator as an argument and proceed without 
> checking which it got.

OK.

> 
>> and once a call ITERATOR. __next__() raises StopIteration every
>  >  such subsequent call does the same.
> 

if it can't be restarted (serial line input) then don't, else do.
serial line, ethernet, etc are basically pipes. But a list itself can be 
re-wound, be it a file on disk, something in memory, on tape -- whatever

may have to reach back past the 'pipe' to the 'iterator' there to 
restart but being able to restart (elegantly) restartables is the point.

> After returning objects for some number of calls, which might be unbounded.
> 
> The protocol is basically one method with defined behavior.  It is 
> intentionally minimal so it can be used as the universal within-Python 
> object stream protocol.  Multiple ways of getting interators is in line 
> with this purpose.

I think clarity is also needed here.  Different disciplines will 
interpret the above differently. Stream means river, channel, pipe, 
singular direction to me.  Once the water flows past there is no hope of 
getting those molecules back in same order.  A list of things in a 
container (variable or file) is not a stream and can be rewound. The 
whole concept of random access hinges on this.
To me this boils down to two distinct concepts.
   one being stream as in here it comes there it goes, never to return.
     The stream is not rewindable. The container you put it in might be.
   one being sequential reading of finite number of randomly accessible
     things.  This being inherently rewindable.
Testing which is simple enough and can set the ability to rewind. 
Having it 'built-in' will reduce the problems generated by another 
'do-it-yourself' design by person that may or may not have thought 
things out.  The old - "I took the carburettor off the Olds but it 
doesn't work on my Hugo. Can you help me?" would be avoided.
Really - rewind is better if it is builtin and preforms where it should.
The docs should explain what will or will not happen and why. 
Preferably in plain language. :)



In short: are you telling us the reset() can't do in background the 
exact same thing that the docs tell the users to do?  It's a lot simpler 
to move file descriptors and pointers from the inside.

I often get so close to things I forget to look up too.


> 
> Terry Jan Reedy
> 



From namekuseijin at gmail.com  Thu May 21 14:48:56 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Thu, 21 May 2009 11:48:56 -0700 (PDT)
Subject: Performance java vs. python
References: <89dd3da60905191032w369a8868r855ad7846e91046b@mail.gmail.com> 
	<0c588145-ee74-42e8-a516-5d398bfb7456@q14g2000vbn.googlegroups.com> 
	<gv1nor$10uu$1@adenine.netfront.net>
	<Xns9C1262ED6DA67duncanbooth@127.0.0.1> 
	<ViaRl.95042$Ku5.64377@newsfe10.ams2>
Message-ID: <bf9747be-2669-4e2e-9ede-b7738a1eb5a3@o18g2000yqi.googlegroups.com>

On May 21, 7:47?am, s... at viridian.paintbox (Sion Arrowsmith) wrote:
> Duncan Booth ?<duncan.bo... at suttoncourtenay.org.uk> wrote:
>
> >namekuseijin <namekusei... at gmail.com> wrote:
> >> I find it completely unimaginable that people would even think
> >> suggesting the idea that Java is simpler. ?It's one of the most stupidly
> >> verbose and cranky languages out there, to the point you can't really do
> >> anything of relevance without an IDE automatically pumping out lots of
> >> scaffold code for you.
> >But that means Java programmers are obviously more productive than Python
> >programmers: they produce many more lines of code per day even if much of
> >it is boileplate or even automatically generated. Managers like that.
>
> >OTOH, I consider it a productive day if I end up with fewer lines of code
> >than I started with.
>
> A friend once justified a negative LOC count as being the sign of a
> good day with the following observation:
>
> Code that doesn't exist contains no bugs.
> Code that doesn't exist takes no time to execute.
> Code that doesn't exist takes up no space.
> Code that doesn't exist doesn't need maintenance.

Amusing tales.  And very true too -- managers just love LOC and
straightjacket programming environments.

Here's what the father of Unix, Ken Thompson, said once about LOC:
"One of my most productive days was throwing away 1000 lines of code."

http://www.brainyquote.com/quotes/quotes/k/kenthompso254858.html


From davea at ieee.org  Thu May 21 14:54:33 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 21 May 2009 14:54:33 -0400
Subject: making a python program in windows
In-Reply-To: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>
References: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>
Message-ID: <4A15A369.6020600@ieee.org>



Rustom Mody wrote:
> I know how to make a python script behave like a (standalone) program
> in unix --
> 1. put a #! path/to/python as the first line
> 2. make the file executable
>
> The closest I know how to do this in windows is:
> r-click the file in win-explorer
> goto properties
> goto open with
> change pythonw to python
>
> Can someone enlighten me about a more scriptish way of doing this?
> Basically if I have to setup that program on other (windows) m/cs is
> there some .bat or .vbs or some regedit thingy Ive to do to avoid the
> Rt-click routine?
>
>   
Duncan told you about assoc and ftype, two programs that manipulate 
those associations (show and edit).  But one more thing you may want if 
you work much from a command line:

Look at the environment variable PATHEXT.  If it doesn't have a .PY and 
.PYW, you might want to add them.  That way when someone is typing a 
script name at the command prompt, they don't need an extension.


Anyway, now you can see two batch files you could use to make a 
particular version of Python active.  The first one uses assoc and ftype 
to fix the asssociations. And the other changes the environment variable 
PATHEXT to make the extension optional.  Note that changing the 
environment variable is effective only for that DOS box, and its 
children.  If you want a permanent change, you need to change the 
registry, probably at
   hklm\SYSTEM\ControlSet001\Contro/Session\Session 
Manager\Environment\PATHEXT


This can be automated either with a .REG file, or with a few lines of 
Python code that manipulates the registry.  The latter is better, 
because you can avoid disturbing the other extensions that will already 
be there.


You can also manipulate the registry to get SendTo items on the context 
menu for .PY files, and so on.




From davea at ieee.org  Thu May 21 15:06:50 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 21 May 2009 15:06:50 -0400
Subject: A question regd configobj
In-Reply-To: <5ead360a0905210423q526e21ffgad3be1415ac148dd@mail.gmail.com>
References: <5ead360a0905210423q526e21ffgad3be1415ac148dd@mail.gmail.com>
Message-ID: <4A15A64A.6040205@ieee.org>

Srijayanth Sridhar wrote:
> Hello,
>
> I am wondering if it is possible to have hexadecimal strings in a ini file
> and have configobj parse it correctly.
>
> for eg:
> moonwolf at trantor:~/python/config$ cat foo
> foo="\x96\x97"
> .
> .
> .
>   
>>>> a=ConfigObj("foo")
>>>> a
>>>>         
> ConfigObj({'foo': '\\x96\\x97'})
>   
>>>> a['foo']
>>>>         
> '\\x96\\x97'
>
> As you can see the string has escaped the '\' and I want to suppress that
> behavior. I've looked at the documentation and haven't been able to figure
> out if this is an available feature or not.
>
> Any help will be greatly appreciated.
>
> Thank you,
>
> Jayanth
>
>   
When you are using the Python interpreter, the interpreter will escape 
the strings it displays, if you use your present approach.  Try using 
print() to see what the string really contains.

Both approaches are useful -- the interpreter tries to show you 
approximately what you'd have to type to create that value.  Print just 
displays the character, allowing them to take whatever action is called 
for on the output device.

 >>> st = "Line 1\nLine 2"
 >>> st
'Line 1\nLine 2'
 >>> print st
Line 1
Line 2
 >>>



From davea at ieee.org  Thu May 21 15:22:08 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 21 May 2009 15:22:08 -0400
Subject: python question
In-Reply-To: <407409.23763.qm@web36503.mail.mud.yahoo.com>
References: <407409.23763.qm@web36503.mail.mud.yahoo.com>
Message-ID: <4A15A9E0.5050901@ieee.org>

Craig wrote:
> How do i install this.i never seen a python write in c before.
>
>
>   
Well, I've never seen a snake program in any language, python or 
otherwise.  And I believe python was named after Monty Python, not the 
snake.  But once it got its name, snake puns abound.

Anyway, why not tell you what you want to install, and on what 
platform?  If it's Python 2.6.2 on MS Windows XP, just download and run 
the msi file.
    On web page:   http://www.python.org/download/, you'd choose Python 
2.6.2 Windows installer 
<http://www.python.org/ftp/python/2.6.2/python-2.6.2.msi>  and it'd give 
you file python-2.6.2.msi





From nick at craig-wood.com  Thu May 21 15:29:55 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Thu, 21 May 2009 14:29:55 -0500
Subject: How to Spawn a process with P_NOWAIT and pass it some data ?
References: <mailman.440.1242823293.8015.python-list@python.org>
Message-ID: <slrnh1b7jo.jfq.nick@irishsea.home.craig-wood.com>

Barak, Ron <Ron.Barak at lsi.com> wrote:
>  This is my first try at IPC in Python, and I would like to ask your help wi=
>  th the following problem:
> 
>  I would like to spawn a process with P_NOWAIT, and pass some data to the ch=
>  ild process.
> 
>  I created two scripts to try IPC (in a blocking way):
> 
>  $ cat subprocess_sender.py
>  #!/usr/bin/env python
> 
>  import subprocess
> 
>  proc = subprocess.Popen(["python", "-u", "subprocess_receiver.py"],
>  stdin=subprocess.PIPE, shell=True)

You don't need shell=True here I wouldn't have thought.  It is a bad
idea in general.

>  proc.communicate(input="this is sent from subprocess_sender.py")[0]
>  proc.stdin.close()
>  and
> 
>  $ cat subprocess_receiver.py
>  #!/usr/bin/env python
> 
>  import sys
> 
>  print sys.stdin.readline()
> 
>  These scripts intercommunicate nicely:
> 
>  $ python -u  subprocess_sender.py
>  this is sent from subprocess_sender.py
[snip]
>  Can anyone suggest what is the correct way to implement P_NOWAIT and still
>  be able to communicate with the child process ?

You've written it already!  subprocess doesn't wait for a processes
until you call the communicate or wait methods.

If you want to communicate with the subprocess but not block waiting
for all of its output then use the file handle proc.stdout, eg

------------------------------------------------------------
import subprocess
proc = subprocess.Popen(["python", "-u", "subprocess_receiver.py"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, bufsize=0)
proc.stdin.write("10\n")
proc.stdin.write("this is sent from subprocess_sender.py\n")
proc.stdin.close()
while True:
    line = proc.stdout.readline()
    if not line:
        break
    print "Received %r" % line
proc.wait()
------------------------------------------------------------
# subprocess_receiver.py

import sys
import time

times = int(sys.stdin.readline())
line = sys.stdin.readline().rstrip()

for x in range(times):
    print "%d: %s" % (x, line)
    time.sleep(1)
------------------------------------------------------------
$ python subprocess_test3.py
Received '0: this is sent from subprocess_sender.py\n'
Received '1: this is sent from subprocess_sender.py\n'
Received '2: this is sent from subprocess_sender.py\n'
Received '3: this is sent from subprocess_sender.py\n'
Received '4: this is sent from subprocess_sender.py\n'
Received '5: this is sent from subprocess_sender.py\n'
Received '6: this is sent from subprocess_sender.py\n'
Received '7: this is sent from subprocess_sender.py\n'
Received '8: this is sent from subprocess_sender.py\n'
Received '9: this is sent from subprocess_sender.py\n'
Received '10: this is sent from subprocess_sender.py\n'
(printed with a 1 second pause between each line)
------------------------------------------------------------

If you want to interact with a subprocess (eg send, receive, send,
receive) then use the pexpect module - buffering in subprocess will
cause you nothing but pain otherwise!

>  (Or, is there a way to create a subprocess.Popen object from what I assume =
>  is the process handle integer ?)

Errr, not as far as I know.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From jorge.vargas at gmail.com  Thu May 21 15:43:42 2009
From: jorge.vargas at gmail.com (Jorge Vargas)
Date: Thu, 21 May 2009 15:43:42 -0400
Subject: How to get path.py ? http://www.jorendorff.com/ is down
Message-ID: <32822fe60905211243o208589e5y236c024fa429b735@mail.gmail.com>

Hello.

Anyone knows what is the problem with this package? apparently the
author's site is down which prevents pip from installing it. I can
download the zip and go from there but It seems most of the docs are
gone with the site.


From kyrie at uh.cu  Thu May 21 15:47:35 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Thu, 21 May 2009 15:47:35 -0400
Subject: How do I install these C modules in python? The tale of the C
	programming snake.
In-Reply-To: <1705.22207.qm@web36507.mail.mud.yahoo.com>
References: <1705.22207.qm@web36507.mail.mud.yahoo.com>
Message-ID: <200905211547.36311.kyrie@uh.cu>


I don't know the answer, but to do you a favour (and increase the visibility), 
I'm replying with a more... explicit subject line.

=== Original message ===

On Thursday 21 May 2009 09:19:23 am Craig wrote:
> http://downloads.emperorlinux.com/contrib/pyiw
> http://downloads.emperorlinux.com/contrib/pywpa
>
>
> Sorry fro the 2 post.How do i install a python moudles write en in C?

=====

[Suggestions for next time: always write a subject relevant to the /specific/ 
question you are asking. Bonus if you can make it interesting. Never leave 
the subject line empty. If you need to correct yourself, reply to your own 
message instead of opening a new thread.]

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From kay at fiber-space.de  Thu May 21 16:10:49 2009
From: kay at fiber-space.de (Kay Schluehr)
Date: Thu, 21 May 2009 13:10:49 -0700 (PDT)
Subject: How to get path.py ? http://www.jorendorff.com/ is down
References: <mailman.521.1242935026.8015.python-list@python.org>
Message-ID: <33e2534d-706f-4cad-8b35-fb9dc22b25ee@l12g2000yqo.googlegroups.com>

On 21 Mai, 21:43, Jorge Vargas <jorge.var... at gmail.com> wrote:
> Hello.
>
> Anyone knows what is the problem with this package? apparently the
> author's site is down which prevents pip from installing it. I can
> download the zip and go from there but It seems most of the docs are
> gone with the site.

The code comments shall be sufficient. It is a single not very complex
module that basically  unifies several stdlib APIs as methods of a
string subclass.


From jorge.vargas at gmail.com  Thu May 21 16:18:25 2009
From: jorge.vargas at gmail.com (Jorge Vargas)
Date: Thu, 21 May 2009 16:18:25 -0400
Subject: How to get path.py ? http://www.jorendorff.com/ is down
In-Reply-To: <32822fe60905211243o208589e5y236c024fa429b735@mail.gmail.com>
References: <32822fe60905211243o208589e5y236c024fa429b735@mail.gmail.com>
Message-ID: <32822fe60905211318u11a29357w14c2abda189abd8b@mail.gmail.com>

On Thu, May 21, 2009 at 3:43 PM, Jorge Vargas <jorge.vargas at gmail.com> wrote:
> Hello.
>
> Anyone knows what is the problem with this package? apparently the
> author's site is down which prevents pip from installing it. I can
> download the zip and go from there but It seems most of the docs are
> gone with the site.
>

For future references

there is a copy here
http://wiki.python.org/moin/PathModule
and the article is on the way back machine
http://web.archive.org/web/20071012022445/http://www.jorendorff.com/articles/python/path/


From terminatorul at gmail.com  Thu May 21 16:26:13 2009
From: terminatorul at gmail.com (Timothy Madden)
Date: Thu, 21 May 2009 23:26:13 +0300
Subject: python3 module for dbus ?
In-Reply-To: <guuojl$l9g$1@panix3.panix.com>
References: <4a1281ef$0$90271$14726298@news.sunsite.dk>
	<guuojl$l9g$1@panix3.panix.com>
Message-ID: <4a15b88c$0$90265$14726298@news.sunsite.dk>

Aahz wrote:
> In article <4a1281ef$0$90271$14726298 at news.sunsite.dk>,
> Timothy Madden  <terminatorul at gmail.com> wrote:
[...]
>> Do you know if I can get dbus bindings for python3 and glib bindings for 
>> python3 ? Or could I use them otherwise (like without the modules) ?
> 
> Sorry, no answers to your questions off-hand, but what's wrong with
> using 2.x?

It is now old and will be replaced by 3.0
And I am starting a new project. I think it would be appropriate to 
start it with the new version of python.

Timothy Madden


From trigfa at googlemail.com  Thu May 21 16:51:56 2009
From: trigfa at googlemail.com (Graham Arden)
Date: Thu, 21 May 2009 13:51:56 -0700 (PDT)
Subject: Slicing an array in groups of eight
Message-ID: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>

A python novice writes.....

Hello,

I'm trying to extract certain frames from a stack of images as part of
a project.  In order to do this I need to produce an array which
consists of a group of eight, then misses the next 8, then selects the
next eight etc.

i.e (0, 1, 2, 3, 4, 5, 6, 7, 16, 17,18, 19,20,21, 22, 23, 32,33,....
etc)

The following code will produce a series of arrays:

a = arange (0,512)
b = [a[i:i + 8] for i in range (0, len(a), 16)]

[array([0, 1, 2, 3, 4, 5, 6, 7]),
 array([16, 17, 18, 19, 20, 21, 22, 23]),
 array([32, 33, 34, 35, 36, 37, 38, 39]),
 array([48, 49, 50, 51, 52, 53, 54, 55]),
 array([64, 65, 66, 67, 68, 69, 70, 71]),
 array([80, 81, 82, 83, 84, 85, 86, 87]),
etc...


unfortunately I can't work out a way of joining then into a single
array.

Alternatively is there a simpler way of producing the array above?

Thanks

Graham.
http://surelythatcantberight.blogspot.com/


From emperorcezar at gmail.com  Thu May 21 16:58:07 2009
From: emperorcezar at gmail.com (emperorcezar)
Date: Thu, 21 May 2009 13:58:07 -0700 (PDT)
Subject: PyXML difficulties
Message-ID: <2e0adac2-b30d-4928-ae07-a3e65400bc9c@j12g2000vbl.googlegroups.com>

I'm new to using the xml libs. I'm trying to create xml pragmatically,
but I'm finding an issue. I have two elements I'm creating using
createElementNS two elements (soap:Envelope and context). Each having
a different namespace. When I print the created xml, the namespace
attribute gets moved from the context element to the envelope element.
Is there a reason for this, and how can I get it to not do that?

Code:
    from xml.dom import implementation
    from xml.dom.ext import PrettyPrint

    namespace = 'http://www.w3.org/2003/05/soap-envelope'

    # create XML DOM document
    doc = implementation.createDocument(None, '', None)

    # create soap envelope element with namespaces
    soapenv = doc.createElementNS(namespace, "soap:Envelope")

    # add soap envelope element
    doc.appendChild(soapenv)

    # create header element
    header = doc.createElementNS(namespace, "soap:Header")

    context = doc.createElementNS("urn:zimbra", "context")

    context.appendChild(doc.createTextNode(' '))

    header.appendChild(context)

    soapenv.appendChild(header)

    PrettyPrint(doc)

What I'm getting as output:

<?xml version='1.0' encoding='UTF-8'?>
<soap:Envelope xmlns='urn:zimbra' xmlns:soap='http://www.w3.org/
2003/05/soap-envelope'>
  <soap:Header>
    <context>
    </context>
  </soap:Header>
</soap:Envelope>

What I would expect
<?xml version='1.0' encoding='UTF-8'?>
<soap:Envelope xmlns:soap='http://www.w3.org/2003/05/soap-envelope'>
  <soap:Header>
    <context xmlns='urn:zimbra'>
    </context>
  </soap:Header>
</soap:Envelope>


From seanm.py at gmail.com  Thu May 21 17:05:25 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Thu, 21 May 2009 14:05:25 -0700 (PDT)
Subject: 4 hundred quadrillonth?
Message-ID: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>

The explaination in my introductory Python book is not very
satisfying, and I am hoping someone can explain the following to me:

>>> 4 / 5.0
0.80000000000000004

4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
It bothers me.


From google at mrabarnett.plus.com  Thu May 21 17:17:04 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 22:17:04 +0100
Subject: 4 hundred quadrillonth?
In-Reply-To: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
Message-ID: <4A15C4D0.8050504@mrabarnett.plus.com>

seanm.py at gmail.com wrote:
> The explaination in my introductory Python book is not very
> satisfying, and I am hoping someone can explain the following to me:
> 
>>>> 4 / 5.0
> 0.80000000000000004
> 
> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> It bothers me.

Read http://docs.python.org/tutorial/floatingpoint.html



From Scott.Daniels at Acm.Org  Thu May 21 17:17:36 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 21 May 2009 14:17:36 -0700
Subject: Overlapping region resolution
In-Reply-To: <444613e9-783e-4cd8-b801-1ea14ff5fb19@x6g2000vbg.googlegroups.com>
References: <444613e9-783e-4cd8-b801-1ea14ff5fb19@x6g2000vbg.googlegroups.com>
Message-ID: <4sGdnautFLE8XojXnZ2dnUVZ_jSdnZ2d@pdx.net>

psaffrey at googlemail.com wrote:
> This may be an algorithmic question, but I'm trying to code it in
> Python, so...
> 
> I have a list of pairwise regions, each with an integer start and end
> and a float data point. There may be overlaps between the regions. I
> want to resolve this into an ordered list with no overlapping
> regions.
> ... (indication of having at least struggled a bit) ...
> Devising an algorithm to do this is making my brain hurt. Any ideas?

I really hope I'm not giving away the key to a homework problem.
One sort key for such lists that I've found fruitful in the past is:
     (start, -end)
Maybe it will prove helpful to you as well.

--Scott David Daniels
Scott.Daniels at Acm.Org


From lists at cheimes.de  Thu May 21 17:36:04 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 21 May 2009 23:36:04 +0200
Subject: 4 hundred quadrillonth?
In-Reply-To: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
Message-ID: <gv4hg4$6c0$1@ger.gmane.org>

seanm.py at gmail.com schrieb:
> The explaination in my introductory Python book is not very
> satisfying, and I am hoping someone can explain the following to me:
> 
>>>> 4 / 5.0
> 0.80000000000000004
> 
> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> It bothers me.

Welcome to IEEE 754 floating point land! :)

Christian



From vlastimil.brom at gmail.com  Thu May 21 17:40:41 2009
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Thu, 21 May 2009 23:40:41 +0200
Subject: Slicing an array in groups of eight
In-Reply-To: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>
References: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>
Message-ID: <9fdb569a0905211440t5c02fed7ma1af9aca2db6918a@mail.gmail.com>

2009/5/21 Graham Arden <trigfa at googlemail.com>:
> A python novice writes.....
>
> Hello,
>
> I'm trying to extract certain frames from a stack of images as part of
> a project. ?In order to do this I need to produce an array which
> consists of a group of eight, then misses the next 8, then selects the
> next eight etc.
>
> i.e (0, 1, 2, 3, 4, 5, 6, 7, 16, 17,18, 19,20,21, 22, 23, 32,33,....
> etc)
>
...>
> Alternatively is there a simpler way of producing the array above?
>
> Thanks
>
> Graham.
>

Hi,
I'm not sure, if I got the requirements for your code completely, but is:
[x for x in range(512) if not (x // 8) % 2]
what you need?

In any case, if you use python lists you should be able to join them
using their extend() or itertools.chain()

###########################

print [x for x in range(512) if not (x // 8) % 2]

nested_lst = [[1,2],[4,5],[6,7,8,9],[10,11,12]]
flattened_list_1 = list(itertools.chain(*nested_lst))
print flattened_list_1

flattened_list_2 = []
for sublist in nested_lst:
    flattened_list_2.extend(sublist)
print flattened_list_2

hth
  vbr


From seanm.py at gmail.com  Thu May 21 17:41:14 2009
From: seanm.py at gmail.com (seanm.py at gmail.com)
Date: Thu, 21 May 2009 14:41:14 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
Message-ID: <8833bdfd-b686-48a3-92b9-398084702017@p4g2000vba.googlegroups.com>

On May 21, 5:36?pm, Christian Heimes <li... at cheimes.de> wrote:
> seanm... at gmail.com schrieb:
>
> > The explaination in my introductory Python book is not very
> > satisfying, and I am hoping someone can explain the following to me:
>
> >>>> 4 / 5.0
> > 0.80000000000000004
>
> > 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> > It bothers me.
>
> Welcome to IEEE 754 floating point land! :)
>
> Christian

Thanks for the link and the welcome. Now onward to Bitwise
Operations....

Sean


From bjruth at gmail.com  Thu May 21 17:42:24 2009
From: bjruth at gmail.com (byron)
Date: Thu, 21 May 2009 14:42:24 -0700 (PDT)
Subject: lxml: traverse xml tree and retrieve element based on an attribute
Message-ID: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>

I am using the lxml.etree library to validate an xml instance file
with a specified schema that contains the data types of each element.
This is some of the internals of a function that extracts the
elements:

        schema_doc = etree.parse(schema_fn)
        schema = etree.XMLSchema(schema_doc)

        context = etree.iterparse(xml_fn, events=('start', 'end'),
schema=schema)

        # get root
        event, root = context.next()

        for event, elem in context:
            if event == 'end' and elem.tag == self.tag:
                yield elem
            root.clear()

I retrieve a list of elements from this... and do further processing
to represent them in different ways. I need to be able to capture the
data type from the schema definition for each field in the element.
i.e.

    <xsd:element name="concept">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element ref="foo"/>
                <xsd:element name="concept_id" type="xsd:string"/>
                <xsd:element name="line" type="xsd:integer"/>
                <xsd:element name="concept_value" type="xsd:string"/>
                <xsd:element ref="some_date"/>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>

My thought is to recursively traverse through the schema definition
match the `name` attribute since they are unique to a `type` and
return that element. But I can't seem to make it quite work. All the
xml is valid, validation works, etc. This is what I have:

    def find_node(tree, name):
        for c in tree:
            if c.attrib.get('name') == name:
                return c
            if len(c) > 0:
                return find_node(c, name)
    return 0

I may have been staring at this too long, but when something is
returned... it should be returned completely, no? This is what occurs
with `return find_node(c, name) if it returns 0. `return c` works
(used pdb to verify that), but the recursion continues and ends up
returning 0.

Thoughts and/or a different approach are welcome. Thanks


From gabrycir at gmail.com  Thu May 21 17:48:33 2009
From: gabrycir at gmail.com (TerabyteST)
Date: Thu, 21 May 2009 14:48:33 -0700 (PDT)
Subject: ffmpeg and python big problem
Message-ID: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>

Hello. I am trying to make a video from images shot by my webcam in
python. I use a module I found on the net (here
http://osdir.com/ml/python.matplotlib.general/2005-10/msg00145.html )
but, even if I think I am doing everything correctly, what I only get
is a grey video with some multi-color squares on the top-left bit... I
don't think it's a problem with ffmpeg because I tried with two
different versions. Not even with the codec: i tried wmv, mpg, avi and
everything, but still the same result. And also, my webcam does the
capture right because if I check the image it's OK. Last thing left,
IMO, is the module, but I can't seem to find whats the problem... Is
it because the module was (maybe) made on Linux and I'm working on
windows? If you would help me I'd be so glad!
This program is for my friend and he needs it ready preety quick.

Thank you!


From pavlovevidence at gmail.com  Thu May 21 17:53:38 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 21 May 2009 14:53:38 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
Message-ID: <3bcc27a7-3298-4310-8f61-b3a783e675b4@o30g2000vbc.googlegroups.com>

On May 21, 2:05?pm, seanm... at gmail.com wrote:
> The explaination in my introductory Python book is not very
> satisfying, and I am hoping someone can explain the following to me:
>
> >>> 4 / 5.0
>
> 0.80000000000000004
>
> 4 / 5.0 is 0.8. No more, no less.

That would depend on how you define the numbers and division.

What you say is correct for real numbers and field division.  It's not
true for the types of numbers Python uses, which are not real numbers.

Python numbers are floating point numbers, defined (approximately) by
IEEE 754, and they behave similar to but not exactly the same as real
numbers.  There will always be small round-off errors, and there is
nothing you can do about it except to understand it.


> It bothers me.

Oh well.

You can try Rational numbers if you want, I think they were added in
Python 2.6.  But if you're not careful the divisors can get
ridiculously large.


Carl Banks


From kochhar.mw at gmail.com  Thu May 21 17:55:23 2009
From: kochhar.mw at gmail.com (shailesh)
Date: Thu, 21 May 2009 14:55:23 -0700 (PDT)
Subject: Wrapping methods of built-in dict
References: <c60e66f1-0bb0-45e6-951f-c8909df7ea11@w35g2000prg.googlegroups.com>
	<pan.2009.05.21.02.31.28@REMOVE.THIS.cybersource.com.au>
Message-ID: <6f21d89b-755d-40b8-a42b-0510e5580f93@g22g2000pra.googlegroups.com>

On May 20, 7:31?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Wed, 20 May 2009 18:42:38 -0700, shailesh wrote:
> > The reason as far as I understand is that the methods on the built-in
> > dict are not of MethodType or FunctionType
>
> That seems to be true:
>
> >>> type({}.get)
> <type 'builtin_function_or_method'>
>
>>> type(dict.get>
> <type 'method_descriptor'>
>
> > so they are not included in
> > the result of the inspect.getmembers call and are not wrapped.
>
> But that isn't:
>
> >>> zip(*inspect.getmembers(dict))[0] ?# extract the names only
>
> ('__class__', '__cmp__', '__contains__', '__delattr__', '__delitem__',
> '__doc__', '__eq__', '__ge__', '__getattribute__', '__getitem__',
> '__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__',
> '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__',
> '__setattr__', '__setitem__', '__str__', 'clear', 'copy', 'fromkeys',
> 'get', 'has_key', 'items', 'iteritems', 'iterkeys', 'itervalues', 'keys',
> 'pop', 'popitem', 'setdefault', 'update', 'values')
>
> So the problem isn't directly with getmembers, but with the predicate
> functions you have passed to it (inspect.isfunction and inspect.method).
> Try inspect.ismethoddescriptor instead.

Thanks for that. Between ismethod, isfunction, ismethoddescriptor and
isbuiltin I think I can cover all the types needed for wrapping
classes.

I began writing an equivalent version for wrapping objects instead of
classes. The problem I run into is that there isn't a predicate for
some methods of dict instances

>>> all = set([ name for (name, method) in inspect.getmembers({}) ])    # get all the methods
>>> builtin = set([ name for (name, method) in inspect.getmembers({}, inspect.isbuiltin) ])  # get the builtin methods
>>> for m in all.difference(builtin):    # print the types of what's left over
...     print m, type(getattr({}, m))
...
__ne__ <type 'method-wrapper'>
__setattr__ <type 'method-wrapper'>
__hash__ <type 'NoneType'>
__delitem__ <type 'method-wrapper'>
__str__ <type 'method-wrapper'>
__getattribute__ <type 'method-wrapper'>
__class__ <type 'type'>
__cmp__ <type 'method-wrapper'>
__delattr__ <type 'method-wrapper'>
__iter__ <type 'method-wrapper'>
__le__ <type 'method-wrapper'>
__len__ <type 'method-wrapper'>
__gt__ <type 'method-wrapper'>
__setitem__ <type 'method-wrapper'>
__lt__ <type 'method-wrapper'>
__ge__ <type 'method-wrapper'>
__eq__ <type 'method-wrapper'>
__doc__ <type 'str'>
__init__ <type 'method-wrapper'>
__repr__ <type 'method-wrapper'>

>>> [ attr for attr in dir(inspect) if attr.startswith('is') ]   # list of predicates supported by inspect
['isabstract', 'isbuiltin', 'isclass', 'iscode', 'isdatadescriptor',
'isframe', 'isfunction', 'isgenerator', 'isgeneratorfunction',
'isgetsetdescriptor', 'ismemberdescriptor', 'ismethod',
'ismethoddescriptor', 'ismodule', 'isroutine', 'istraceback']

>>> inspect.getmembers({}, inspect.ismethod)
[]
>>> inspect.getmembers({}, inspect.isfunction)
[]
>>> inspect.getmembers({}, inspect.ismemthoddescriptor)
[]

There doesn't seem to be a predicate returning method wrappers. Is
there an alternate way to query an object for attributes that are of
method wrappers?

This exercise also makes me question if I'm going about this
correctly. If I want to add functionality to the methods of a class or
an object are decorators and the inspect module the pythonic way to go
about it? I can think of alternative implementations either through
metaclasses or proxy objects.

Thanks again.


From emile at fenx.com  Thu May 21 18:02:18 2009
From: emile at fenx.com (Emile van Sebille)
Date: Thu, 21 May 2009 15:02:18 -0700
Subject: Slicing an array in groups of eight
In-Reply-To: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>
References: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>
Message-ID: <gv4itl$ae5$1@ger.gmane.org>

On 5/21/2009 1:51 PM Graham Arden said...
> A python novice writes.....
> 
> Hello,
> 
> I'm trying to extract certain frames from a stack of images as part of
> a project.  In order to do this I need to produce an array which
> consists of a group of eight, then misses the next 8, then selects the
> next eight etc.
> 
> i.e (0, 1, 2, 3, 4, 5, 6, 7, 16, 17,18, 19,20,21, 22, 23, 32,33,....
> etc)
> 
> The following code will produce a series of arrays:
> 
> a = arange (0,512)

> b = [a[i:i + 8] for i in range (0, len(a), 16)]

How about...

 >>> a = range(0,512)
 >>> b = []
 >>> [b.extend(a[i:i + 8]) for i in range (0, len(a), 16)]
 >>> b
[0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 23, 32,
...
497, 498, 499, 500, 501, 502, 503]
 >>>

Emile



From david.lyon at preisshare.net  Thu May 21 18:05:29 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Thu, 21 May 2009 18:05:29 -0400
Subject: dbfpy - cannot store new record
In-Reply-To: <4A157902.9080507@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com> <4A157902.9080507@shopzeus.com>
Message-ID: <84d1f2dab8a4e869306dee81e2605c93@preisshare.net>


well, dbfpy isn't super sophisticated.

If you make your own code fixes, maybe you can provide them
back to the package author.


On Thu, 21 May 2009 17:53:38 +0200, Laszlo Nagy <gandalf at shopzeus.com>
wrote:
> Here is the next problem. For boolean/logical fields, I can set their 
> value to True/False easily. However, setting NULL seems impossible:
> 
> rec = tbl.newRecord()
> rec["SOMEFIELD1"] = True # Works fine
> rec["SOMEFIELD2"] = False # Works fine
> rec["SOMEFIELD3"] = None # Will store False
> rec["SOMEFIELD3"] = 0 # Will store False
> rec["SOMEFIELD3"] = "" # Will store False
> rec["SOMEFIELD3"] = chr(32) # Will store False
> rec["SOMEFIELD3"] = chr(0) # Will store False
> rec.store()
> 
> Strange thing: if I do not set the value of a numeric field, it becomes 
> NULL. The same thing I cannot do for logical fields: if I do not set the 
> value of a logical field, it becomes an invalid value, denoted with a 
> question mark.
> 
> Any ideas?
> 
> Thanks,
> 
>    Laszlo


From paul at boddie.org.uk  Thu May 21 18:06:45 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Thu, 21 May 2009 15:06:45 -0700 (PDT)
Subject: PyXML difficulties
References: <2e0adac2-b30d-4928-ae07-a3e65400bc9c@j12g2000vbl.googlegroups.com>
Message-ID: <5c474572-8a5e-4f2a-9fbc-5da285633482@d14g2000yql.googlegroups.com>

On 21 Mai, 22:58, emperorcezar <emperorce... at gmail.com> wrote:
> I'm new to using the xml libs. I'm trying to create xml pragmatically,
> but I'm finding an issue. I have two elements I'm creating using
> createElementNS two elements (soap:Envelope and context). Each having
> a different namespace. When I print the created xml, the namespace
> attribute gets moved from the context element to the envelope element.
> Is there a reason for this, and how can I get it to not do that?

Having the default namespace declared on an ancestor of the context
element is completely valid in this case, since the soap:Envelope
element is associated with a different namespace. You could see what
happens if you serialise the document using a different library
function or document/node method, however.

> Code:
> ? ? from xml.dom import implementation
> ? ? from xml.dom.ext import PrettyPrint
>
> ? ? namespace = 'http://www.w3.org/2003/05/soap-envelope'
>
> ? ? # create XML DOM document
> ? ? doc = implementation.createDocument(None, '', None)

[...]

Note that according to the specifications, the element name should be
None (null) for this kind of createDocument invocation. See here for
details:

http://www.w3.org/TR/DOM-Level-3-Core/core.html#Level-2-Core-DOM-createDocument

Paul


From emile at fenx.com  Thu May 21 18:11:16 2009
From: emile at fenx.com (Emile van Sebille)
Date: Thu, 21 May 2009 15:11:16 -0700
Subject: ffmpeg and python big problem
In-Reply-To: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>
References: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>
Message-ID: <gv4jef$cfk$1@ger.gmane.org>

On 5/21/2009 2:48 PM TerabyteST said...
> Hello. I am trying to make a video from images shot by my webcam in
> python. I use a module I found on the net (here
> http://osdir.com/ml/python.matplotlib.general/2005-10/msg00145.html )
> but, even if I think I am doing everything correctly, what I only get
> is a grey video with some multi-color squares on the top-left bit... I
> don't think it's a problem with ffmpeg because I tried with two
> different versions. Not even with the codec: i tried wmv, mpg, avi and
> everything, but still the same result. And also, my webcam does the
> capture right because if I check the image it's OK. Last thing left,
> IMO, is the module, but I can't seem to find whats the problem... Is
> it because the module was (maybe) made on Linux and I'm working on
> windows? If you would help me I'd be so glad!
> This program is for my friend and he needs it ready preety quick.

Why not use mencoder directly?  Last time I did this I used Python to 
organize the shots and mencoder to create the video...

Emile



From robert.kern at gmail.com  Thu May 21 18:14:23 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 21 May 2009 17:14:23 -0500
Subject: Slicing an array in groups of eight
In-Reply-To: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>
References: <0c02cbc1-2eca-46ff-a616-9df333777b52@n4g2000vba.googlegroups.com>
Message-ID: <gv4jnv$d2o$1@ger.gmane.org>

On 2009-05-21 15:51, Graham Arden wrote:
> A python novice writes.....
>
> Hello,
>
> I'm trying to extract certain frames from a stack of images as part of
> a project.  In order to do this I need to produce an array which
> consists of a group of eight, then misses the next 8, then selects the
> next eight etc.
>
> i.e (0, 1, 2, 3, 4, 5, 6, 7, 16, 17,18, 19,20,21, 22, 23, 32,33,....
> etc)
>
> The following code will produce a series of arrays:
>
> a = arange (0,512)
> b = [a[i:i + 8] for i in range (0, len(a), 16)]
>
> [array([0, 1, 2, 3, 4, 5, 6, 7]),
>   array([16, 17, 18, 19, 20, 21, 22, 23]),
>   array([32, 33, 34, 35, 36, 37, 38, 39]),
>   array([48, 49, 50, 51, 52, 53, 54, 55]),
>   array([64, 65, 66, 67, 68, 69, 70, 71]),
>   array([80, 81, 82, 83, 84, 85, 86, 87]),
> etc...
>
>
> unfortunately I can't work out a way of joining then into a single
> array.
>
> Alternatively is there a simpler way of producing the array above?

b = a.reshape((-1, 8))

You will want to ask numpy questions on the numpy mailing list:

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From apt.shansen at gmail.com  Thu May 21 18:16:43 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 21 May 2009 15:16:43 -0700
Subject: python3 module for dbus ?
In-Reply-To: <4a15b88c$0$90265$14726298@news.sunsite.dk>
References: <4a1281ef$0$90271$14726298@news.sunsite.dk>
	<guuojl$l9g$1@panix3.panix.com> 
	<4a15b88c$0$90265$14726298@news.sunsite.dk>
Message-ID: <7a9c25c20905211516q4edbb8fbt7e800a8736a8aa1d@mail.gmail.com>

>
>
>  Do you know if I can get dbus bindings for python3 and glib bindings for
>>> python3 ? Or could I use them otherwise (like without the modules) ?
>>>
>>
>> Sorry, no answers to your questions off-hand, but what's wrong with
>> using 2.x?
>>
>
> It is now old and will be replaced by 3.0
> And I am starting a new project. I think it would be appropriate to start
> it with the new version of python.
>

That's really a premature position to take. 2.x is going to continue to be
developed in tandem with 3.0. They're going to release a 2.7, for example.
It's going to take some non-trivial time for there to be all the big
bindings and third party libraries to even start to be ported over.

In particular, I doubt anything on your list would anyitme soon. I know
wxPython isn't even close from what I've read; I've not heard anything of
any of the PostgreSQL libraries doing it but they might be starting or have
made progress already...

Really. Using 2.x is not developing for a dead-end platform. Yeah you should
code in such a way that its as upwards-compatible to 3.x as possible for a
new project, but... 2.6 is not "old", nor deprecated, nor obsolete... and
2.7 will be out Eventually.

--S
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From tjreedy at udel.edu  Thu May 21 18:21:37 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 21 May 2009 18:21:37 -0400
Subject: reseting an iterator
In-Reply-To: <4A159E85.1070400@hughes.net>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>	<gv1q69$muh$1@ger.gmane.org>
	<4A159E85.1070400@hughes.net>
Message-ID: <gv4k5i$emh$1@ger.gmane.org>

I will clarify by starting over with current definitions.

Ob is an iterator iff next(ob) either returns an object or raises 
StopIteration and continues to raise StopIteration on subsequent calls.

Ob is an iterable iff iter(ob) raturns an iterator.

It is intentional that the protocol definitions be minimal, so that they 
can used as widely as possible.

As a convenience, the definition of iterators is given a slight 
complication.  They are defined as a subcategory of iterables, with the 
  requirement that iter(iterator) be that same iterator.  This means 
that iterators need the following boilerplate:
   def __iter__(self): return self
The extra burden is slight since most iterators are based on builtins or 
generator functions or expressions, which add the boilerplate 
automatically.  The convenience is that one may write

def f(iterable_or_iterator):
   it = iter(iterable_or_iterator)
   ...

instead of

def f(iterable_or_iterator):
   if is_iterable(iterable_or_iterator):
     it = iter(iterable_or_iterator)
   else:
     it = iterable_or_iterator

In particular, the internal function that implements for loops can do 
the former.

In other words, a small bit of boilerplate added to iterators, mostly 
automatically, saves boilerplate in the use of iterators and iterables.

When the protocols were defined, there was discussion about whether or 
not to require 'continue to raise StopIteration'.  For instance, an 
iterator that returns objects derived from external input might not have 
any new external input now but expect to get some in the future.  It was 
decided the such iterators should either wait and block the thread or 
return a 'Not now' indicator such as None.  StopIteration should 
consistently mean 'Done, over and out' so for loops, for instance, would 
know to exit.

The OP proposes that StopIteraton should instead mean 'Done until 
reset', without defining 'reset'.  Some comments:
* This would complicate the protocol.
* There are real use cases, and reiterability is a real issue.  But ...
* Depending on the meaning, resetting may or may not be possible.
* When it is possible, it can potentially be done today with a .send() 
method.
* Many use cases are easier with a new iterator.  For instance

for i in iterable: block1()
for i in iterable: block2()

is easier to write than

it = iter(iterable)
for i in it: block1()
it.reset()
for i in it: block2()

with little relative time saving in the second case, for practical 
problems, to compensate for the extra boilerplate.

Terry Jan Reedy



From clp2 at rebertia.com  Thu May 21 18:36:07 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 21 May 2009 15:36:07 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <3bcc27a7-3298-4310-8f61-b3a783e675b4@o30g2000vbc.googlegroups.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<3bcc27a7-3298-4310-8f61-b3a783e675b4@o30g2000vbc.googlegroups.com>
Message-ID: <50697b2c0905211536u79cd8a02tb74e6cb0981a0a3f@mail.gmail.com>

On Thu, May 21, 2009 at 2:53 PM, Carl Banks <pavlovevidence at gmail.com> wrote:
> On May 21, 2:05?pm, seanm... at gmail.com wrote:
>> The explaination in my introductory Python book is not very
>> satisfying, and I am hoping someone can explain the following to me:
>>
>> >>> 4 / 5.0
>>
>> 0.80000000000000004
>>
>> 4 / 5.0 is 0.8. No more, no less.
>
> That would depend on how you define the numbers and division.
>
> What you say is correct for real numbers and field division. ?It's not
> true for the types of numbers Python uses, which are not real numbers.
>
> Python numbers are floating point numbers, defined (approximately) by
> IEEE 754, and they behave similar to but not exactly the same as real
> numbers. ?There will always be small round-off errors, and there is
> nothing you can do about it except to understand it.
>
>
>> It bothers me.
>
> Oh well.
>
> You can try Rational numbers if you want, I think they were added in
> Python 2.6. ?But if you're not careful the divisors can get
> ridiculously large.

The `decimal` module's Decimal type is also an option to consider:

Python 2.6.2 (r262:71600, May 14 2009, 16:34:51)
>>> from decimal import Decimal
>>> Decimal(4)/Decimal(5)
Decimal('0.8')

Cheers,
Chris
-- 
http://blog.rebertia.com


From clp2 at rebertia.com  Thu May 21 18:36:43 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 21 May 2009 15:36:43 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <3bcc27a7-3298-4310-8f61-b3a783e675b4@o30g2000vbc.googlegroups.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<3bcc27a7-3298-4310-8f61-b3a783e675b4@o30g2000vbc.googlegroups.com>
Message-ID: <50697b2c0905211536i52e79a62u7681999b49544f91@mail.gmail.com>

On Thu, May 21, 2009 at 2:53 PM, Carl Banks <pavlovevidence at gmail.com> wrote:
> On May 21, 2:05?pm, seanm... at gmail.com wrote:
>> The explaination in my introductory Python book is not very
>> satisfying, and I am hoping someone can explain the following to me:
>>
>> >>> 4 / 5.0
>>
>> 0.80000000000000004
>>
>> 4 / 5.0 is 0.8. No more, no less.
>
> That would depend on how you define the numbers and division.
>
> What you say is correct for real numbers and field division. ?It's not
> true for the types of numbers Python uses, which are not real numbers.
>
> Python numbers are floating point numbers, defined (approximately) by
> IEEE 754, and they behave similar to but not exactly the same as real
> numbers. ?There will always be small round-off errors, and there is
> nothing you can do about it except to understand it.
>
>
>> It bothers me.
>
> Oh well.
>
> You can try Rational numbers if you want, I think they were added in
> Python 2.6. ?But if you're not careful the divisors can get
> ridiculously large.

The `decimal` module's Decimal type is also an option to consider:

Python 2.6.2 (r262:71600, May 14 2009, 16:34:51)
>>> from decimal import Decimal
>>> Decimal(4)/Decimal(5)
Decimal('0.8')

Cheers,
Chris
-- 
http://blog.rebertia.com


From norseman at hughes.net  Thu May 21 18:45:57 2009
From: norseman at hughes.net (norseman)
Date: Thu, 21 May 2009 15:45:57 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
Message-ID: <4A15D9A5.4090005@hughes.net>

seanm.py at gmail.com wrote:
> The explaination in my introductory Python book is not very
> satisfying, and I am hoping someone can explain the following to me:
> 
>>>> 4 / 5.0
> 0.80000000000000004
> 
> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> It bothers me.
======================================

Machine architecture, actual implementation of logic on the chip and 
what the compiler maker did all add up to creating rounding errors. I 
have read where python, if left to its own, will output everything it 
computed. I guess the idea is to show
	1) python's accuracy and
	2) what was left over
so the picky people can have something to gnaw on.

Astrophysics, Astronomers and like kind may have wants of such.
If you work much in finite math you may want to test the combo to see if 
  it will allow the accuracy you need. Or do you need to change machines?

Beyond that - just fix the money at 2, gas pumps at 3 and the 
sine/cosine at 8 and let it ride. :)


Steve


From google at mrabarnett.plus.com  Thu May 21 18:57:00 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 21 May 2009 23:57:00 +0100
Subject: lxml: traverse xml tree and retrieve element based on an attribute
In-Reply-To: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>
References: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>
Message-ID: <4A15DC3C.2080503@mrabarnett.plus.com>

byron wrote:
> I am using the lxml.etree library to validate an xml instance file
> with a specified schema that contains the data types of each element.
> This is some of the internals of a function that extracts the
> elements:
> 
>         schema_doc = etree.parse(schema_fn)
>         schema = etree.XMLSchema(schema_doc)
> 
>         context = etree.iterparse(xml_fn, events=('start', 'end'),
> schema=schema)
> 
>         # get root
>         event, root = context.next()
> 
>         for event, elem in context:
>             if event == 'end' and elem.tag == self.tag:
>                 yield elem
>             root.clear()
> 
> I retrieve a list of elements from this... and do further processing
> to represent them in different ways. I need to be able to capture the
> data type from the schema definition for each field in the element.
> i.e.
> 
>     <xsd:element name="concept">
>         <xsd:complexType>
>             <xsd:sequence>
>                 <xsd:element ref="foo"/>
>                 <xsd:element name="concept_id" type="xsd:string"/>
>                 <xsd:element name="line" type="xsd:integer"/>
>                 <xsd:element name="concept_value" type="xsd:string"/>
>                 <xsd:element ref="some_date"/>
>             </xsd:sequence>
>         </xsd:complexType>
>     </xsd:element>
> 
> My thought is to recursively traverse through the schema definition
> match the `name` attribute since they are unique to a `type` and
> return that element. But I can't seem to make it quite work. All the
> xml is valid, validation works, etc. This is what I have:
> 
>     def find_node(tree, name):
>         for c in tree:
>             if c.attrib.get('name') == name:
>                 return c
>             if len(c) > 0:
>                 return find_node(c, name)
>     return 0
> 
You're searching the first child and then returning the result, but what
you're looking for might not be in the first child; if it's not then you
need to search the next child:

     def find_node(tree, name):
         for c in tree:
             if c.attrib.get('name') == name:
                 return c
             if len(c) > 0:
                 r = find_node(c, name)
                 if r:
                     return r
         return None

> I may have been staring at this too long, but when something is
> returned... it should be returned completely, no? This is what occurs
> with `return find_node(c, name) if it returns 0. `return c` works
> (used pdb to verify that), but the recursion continues and ends up
> returning 0.
> 
> Thoughts and/or a different approach are welcome. Thanks



From norseman at hughes.net  Thu May 21 19:00:45 2009
From: norseman at hughes.net (norseman)
Date: Thu, 21 May 2009 16:00:45 -0700
Subject: reseting an iterator
In-Reply-To: <gv4k5i$emh$1@ger.gmane.org>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>	<gv1q69$muh$1@ger.gmane.org>	<4A159E85.1070400@hughes.net>
	<gv4k5i$emh$1@ger.gmane.org>
Message-ID: <4A15DD1D.5030005@hughes.net>

Terry Reedy wrote:
> I will clarify by starting over with current definitions.
> 
> Ob is an iterator iff next(ob) either returns an object or raises 
> StopIteration and continues to raise StopIteration on subsequent calls.
> 
> Ob is an iterable iff iter(ob) raturns an iterator.
> 
> It is intentional that the protocol definitions be minimal, so that they 
> can used as widely as possible.
> 
> As a convenience, the definition of iterators is given a slight 
> complication.  They are defined as a subcategory of iterables, with the 
>  requirement that iter(iterator) be that same iterator.  This means that 
> iterators need the following boilerplate:
>   def __iter__(self): return self
> The extra burden is slight since most iterators are based on builtins or 
> generator functions or expressions, which add the boilerplate 
> automatically.  The convenience is that one may write
> 
> def f(iterable_or_iterator):
>   it = iter(iterable_or_iterator)
>   ...
> 
> instead of
> 
> def f(iterable_or_iterator):
>   if is_iterable(iterable_or_iterator):
>     it = iter(iterable_or_iterator)
>   else:
>     it = iterable_or_iterator
> 
> In particular, the internal function that implements for loops can do 
> the former.
> 
> In other words, a small bit of boilerplate added to iterators, mostly 
> automatically, saves boilerplate in the use of iterators and iterables.
> 
> When the protocols were defined, there was discussion about whether or 
> not to require 'continue to raise StopIteration'.  For instance, an 
> iterator that returns objects derived from external input might not have 
> any new external input now but expect to get some in the future.  It was 
> decided the such iterators should either wait and block the thread or 
> return a 'Not now' indicator such as None.  StopIteration should 
> consistently mean 'Done, over and out' so for loops, for instance, would 
> know to exit.
> 
> The OP proposes that StopIteraton should instead mean 'Done until 

Done unless you put the data pointer back to offset zero

> reset', without defining 'reset'.  Some comments:
> * This would complicate the protocol.
> * There are real use cases, and reiterability is a real issue.  But ...
> * Depending on the meaning, resetting may or may not be possible.
> * When it is possible, it can potentially be done today with a .send() 
> method.
> * Many use cases are easier with a new iterator.  For instance
> 
> for i in iterable: block1()
> for i in iterable: block2()
> 
> is easier to write than
> 
> it = iter(iterable)
> for i in it: block1()
> it.reset()
> for i in it: block2()
> 
> with little relative time saving in the second case, for practical 
> problems, to compensate for the extra boilerplate.
> 


while testing:
   for i in it:
     code
   it.reset()



> Terry Jan Reedy
> 



From tjreedy at udel.edu  Thu May 21 19:08:42 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 21 May 2009 19:08:42 -0400
Subject: reseting an iterator
In-Reply-To: <4A15DD1D.5030005@hughes.net>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>	<gv1q69$muh$1@ger.gmane.org>	<4A159E85.1070400@hughes.net>	<gv4k5i$emh$1@ger.gmane.org>
	<4A15DD1D.5030005@hughes.net>
Message-ID: <gv4mtp$kme$1@ger.gmane.org>

norseman wrote:
> Terry Reedy wrote:
>> I will clarify by starting over with current definitions.
>>
>> Ob is an iterator iff next(ob) either returns an object or raises 
>> StopIteration and continues to raise StopIteration on subsequent calls.
>>
>> Ob is an iterable iff iter(ob) raturns an iterator.
>>
>> It is intentional that the protocol definitions be minimal, so that 
>> they can used as widely as possible.
>>
>> As a convenience, the definition of iterators is given a slight 
>> complication.  They are defined as a subcategory of iterables, with 
>> the  requirement that iter(iterator) be that same iterator.  This 
>> means that iterators need the following boilerplate:
>>   def __iter__(self): return self
>> The extra burden is slight since most iterators are based on builtins 
>> or generator functions or expressions, which add the boilerplate 
>> automatically.  The convenience is that one may write
>>
>> def f(iterable_or_iterator):
>>   it = iter(iterable_or_iterator)
>>   ...
>>
>> instead of
>>
>> def f(iterable_or_iterator):
>>   if is_iterable(iterable_or_iterator):
>>     it = iter(iterable_or_iterator)
>>   else:
>>     it = iterable_or_iterator
>>
>> In particular, the internal function that implements for loops can do 
>> the former.
>>
>> In other words, a small bit of boilerplate added to iterators, mostly 
>> automatically, saves boilerplate in the use of iterators and iterables.
>>
>> When the protocols were defined, there was discussion about whether or 
>> not to require 'continue to raise StopIteration'.  For instance, an 
>> iterator that returns objects derived from external input might not 
>> have any new external input now but expect to get some in the future.  
>> It was decided the such iterators should either wait and block the 
>> thread or return a 'Not now' indicator such as None.  StopIteration 
>> should consistently mean 'Done, over and out' so for loops, for 
>> instance, would know to exit.
>>
>> The OP proposes that StopIteraton should instead mean 'Done until 
> 
> Done unless you put the data pointer back to offset zero

And if there is not data pointer?

> 
>> reset', without defining 'reset'.  Some comments:
>> * This would complicate the protocol.
>> * There are real use cases, and reiterability is a real issue.  But ...
>> * Depending on the meaning, resetting may or may not be possible.
>> * When it is possible, it can potentially be done today with a .send() 
>> method.
>> * Many use cases are easier with a new iterator.  For instance
>>
>> for i in iterable: block1()
>> for i in iterable: block2()
>>
>> is easier to write than
>>
>> it = iter(iterable)
>> for i in it: block1()
>> it.reset()
>> for i in it: block2()
>>
>> with little relative time saving in the second case, for practical 
>> problems, to compensate for the extra boilerplate.
>>
> 
> 
> while testing:
>   for i in it:
>     code
>   it.reset()
> 
> 
> 
>> Terry Jan Reedy
>>
> 



From grante at visi.com  Thu May 21 19:09:57 2009
From: grante at visi.com (Grant Edwards)
Date: Thu, 21 May 2009 18:09:57 -0500
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
Message-ID: <r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>

On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
> seanm.py at gmail.com schrieb:
>> The explaination in my introductory Python book is not very
>> satisfying, and I am hoping someone can explain the following to me:
>> 
>>>>> 4 / 5.0
>> 0.80000000000000004
>> 
>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
>> It bothers me.
>
> Welcome to IEEE 754 floating point land! :)

Floating point is sort of like quantum physics: the closer you
look, the messier it gets.

-- 
Grant



From gert.cuykens at gmail.com  Thu May 21 19:17:09 2009
From: gert.cuykens at gmail.com (gert)
Date: Thu, 21 May 2009 16:17:09 -0700 (PDT)
Subject: join two selects
References: <bcf86768-d0e0-4f67-a391-f0dbacba074a@h23g2000vbc.googlegroups.com>
	<mailman.506.1242917636.8015.python-list@python.org>
Message-ID: <7592295f-466e-4aed-a16b-1047c55baa24@e20g2000vbc.googlegroups.com>

On May 21, 4:54?pm, Tim Golden <m... at timgolden.me.uk> wrote:
> gert wrote:
> > I am trying to figure out how to join two selects ?
>
> > SELECT * FROM search
> > SELECT eid, SUM(pnt) AS total_votes FROM vote
>
> > CREATE TABLE votes (
> > ? ? eid ?INTEGER PRIMARY KEY,
> > ? ? uid ?VARCHAR(64),
> > ? ? pnt ?INETEGER DEFAULT 0,
> > );
>
> > CREATE TABLE search (
> > ? ? eid ?INTEGER PRIMARY KEY,
> > ? ? txt ?VARCHAR(64),
> > ? ? end ?DATETIME
> > );
>
> > so the result would be a table that looks like this
>
> > ["eid", "txt", "end", "total_votes"]
>
> That's what's known technically as a join:
>
> SELECT
> ? sea.eid,
> ? sea.txt,
> ? sea.end,
> ? SUM (vot.pnt) AS total_votes
> FROM
> ? search AS sea
> JOIN votes AS vot ON
> ? vot.eid = sea.eid
> GROUP BY
> ? sea.eid,
> ? sea.txt,
> ? sea.end,
>
> (Guessing the join condition from the column names)
>
> TJG

Thanks works great :-)
just needed to at LEFT JOIN and remove sea.txt sea.end from the GROUP
BY


From rhodri at wildebst.demon.co.uk  Thu May 21 19:20:01 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 00:20:01 +0100
Subject: A list with periodic boundary conditions
In-Reply-To: <0f324d00-875a-4d18-bd8b-981997a34e44@q14g2000vbn.googlegroups.com>
References: <0f324d00-875a-4d18-bd8b-981997a34e44@q14g2000vbn.googlegroups.com>
Message-ID: <op.uuay3noza8ncjz@gnudebst>

On Thu, 21 May 2009 13:08:39 +0100, <youhvee at googlemail.com> wrote:

> Hi,
>
> I'm trying to create a new class of list that has periodic boundary
> conditions.
>
> Here's what I have so far:
>
> class wrappedList(list):
>     def __getitem__(self, p):
>         return list.__getitem__(self, p%len(self))
>     def __setitem__(self, p, v):
>         list.__setitem__(self, p%len(self), v)
>
>>>>> a=wrappedList(range(10))
>>>>> a[1]
> 1
>>>>> a[11]
> 1
>
> But I would also like to make slices. For instance I would like
>>>>> a[8:11]
> [8, 9, 0]
>
> I can do it by copying, but I want to return a view to the original
> data, and I have no idea where to start. It seems that the slice needs
> to retain some knowledge of the list from which it derived. i.e. it
> needs to know that it is a slice. Any ideas on how I can extend this
> to allow views?

Reading the docs, this looks like a very messy area of Python 2.x in
that for a builtin like `list` you have to provide a __getslice__ method
despite it being deprecated and only dealing with simple slices.  Good
luck with that.  In Python 3, you just have to deal with the fact that
your __getitem__ and __setitem__ `p` arguments can be slice objects
instead of integers.

If you're set on making your slices views on the original (which means
that changes to the slice will change the original, unlike normal lists!)
then you need to extend your class to remember what it's viewing, and
what the start, stop and step of the slice were.  When it's a view, it
passes (massaged) requests up to its parent.  There's a cute (but likely
inefficient) way of doing this that uses the fact that your view is still
a list under the hood, and stashes the parental indices in it.  This will
also make len() work correctly, for a bonus :-)  It gets quite horrid
quite fast, but here's a very incomplete untested skeleton:

class wrappedList(list):
   def __init__(self, parent=None, *args):
     list.__init__(self, *args)
     self.parent = parent

   def __getitem__(self, p):
     if self.parent is None:
       self.primary_getitem(p)
     else:
       self.view_getitem(p)

   def view_getitem(self, p):
     return self.parent[list.__getitem__(self, p%len(self))]

...and similarly for __setitem__, where primary_getitem() is your
previous __getitem__ method.  All four need to be modified to cope
with slices, of course, and to create new wrappedList objects.
Something like this:

   if isinstance(p, slice):
     if p.start is None:
       start = 0
     else:
       start = p.start
     if p.step is None:
       step = 1
     else:
       step = p.step
     indices = range(start, p.stop, step)
     return wrappedList(indices, parent=self)

This will go horribly, horribly wrong if you delete anything from
your original list, but I can't off-hand think of a view method
that won't.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From norseman at hughes.net  Thu May 21 19:27:07 2009
From: norseman at hughes.net (norseman)
Date: Thu, 21 May 2009 16:27:07 -0700
Subject: finding repeated data sequences in a column
In-Reply-To: <f0c45029-3983-4a84-8f08-2b497594c03e@r34g2000vbi.googlegroups.com>
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
	<c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com>
	<mailman.456.1242841999.8015.python-list@python.org>
	<f0c45029-3983-4a84-8f08-2b497594c03e@r34g2000vbi.googlegroups.com>
Message-ID: <4A15E34B.7050407@hughes.net>

yadin wrote:
> On May 20, 6:53 pm, norseman <norse... at hughes.net> wrote:
>> bearophileH... at lycos.com wrote:
>>> yadin:
>>>> How can I build up a program that tells me that this sequence
>>>> 1000028706
>>>> 1000028707
>>>> 1000028708
>>>> is repeated somewhere in the column, and how can i know where?
>>> Can such patterns nest? That is, can you have a repeated pattern made
>>> of an already seen pattern plus something else?
>>> If you don't want a complex program, then you may need to specify the
>>> problem better.
>>> You may want something like LZ77 or releated (LZ78, etc):
>>> http://en.wikipedia.org/wiki/LZ77
>>> This may have a bug:
>>> http://code.activestate.com/recipes/117226/
>>> Bye,
>>> bearophile
>> ============================================
>> index on column
>> Ndx1 is set to index #1
>> Ndx2 is set to index #2
>> test Ndx1 against Ndx2
>>    if equal write line number and column content to a file
>>            (that's two things on one line:  15 1000028706
>>                                            283 1000028706 )
>>    Ndx1 is set to Ndx2
>>    Ndx2 is set to index #next
>> loop to test    writing out each duplicate set
>>
>> Then use the outfile and index on line number
>>
>> In similar manor, check if line current and next line line numbers are
>> sequential.  If so scan forward to match column content of lower line
>> number and check first matched column's line number and next for
>> sequential.  Print them out if so
>>
>> everything in outfile has 1 or more duplicates
>>
>> 4  aa               |--
>> 5  bb         |--      |      thus 4/5 match 100/101
>> 6  cc            |     |
>> .                |     |
>> 100 aa           |  |--
>> 101 bb         |--
>> 102 ddd
>> 103 cc                  there is a duplicate but not a sequence
>> 200 ff
>>
>> mark duplicate sequences as tested and proceed on through
>>    seq1 may have more than one other seq in file.
>>    the progress is from start to finish without looking back
>>    thus each step forward has fewer lines to test.
>>    marking already knowns eliminates redundant sequence testing.
>>
>> By subseting on pass1 the expensive testing is greatly reduced.
>> If you know your subset data won't exceed memory then the "outfile"
>> can be held in memory to speed things up considerably.
>>
>> Today is: 20090520
>> no code
>>
>> Steve- Hide quoted text -
>>
>> - Show quoted text -
> 
> this is the program...I wrote but is not working
> I have a list of valves, and another of pressures;
> If I am ask to find out which ones are the valves that are using all
> this set of pressures, wanted best pressures
> this is the program i wrote but is not working properly, it suppossed
> to return in the case
> find all the valves that are using pressures 1 "and" 2 "and" 3.
> It returns me A, A2, A35....

looking at the data that seems correct.
there are 3 '1's in the list, 1-A, 1-A2, 1-A35
there are 2 '2's in the list, 2-A, 2-A2
there are 2 '3's in the list, 3-A, 3-A2
and so on

   after the the two sets are paired
indexing on the right yields 1-A,2-A,3-A,1-A2,2-A2,3-A2,7-A4...
indexing on the left  yiels1 1-A,1-A2,1-A35,2-A,2-A2,3-A,3-A2,7-A4...
and the two 78s would pair with a G and with a G2  (78-G, 78-G2)
beyond that I'm a bit lost.

20090521 Steve

> The correct answer supposed to be A and A2...
> if I were asked for pressures 56 and 78 the correct answer supossed to
> be valves G and G2...
> 
> Valves = ['A','A','A','G', 'G', 'G',
> 'C','A2','A2','A2','F','G2','G2','G2','A35','A345','A4'] ##valve names
> pressures = [1,2,3,4235,56,78,12, 1, 2, 3, 445, 45,56,78,1, 23,7] ##
> valve pressures
> result = []
> 
> bestpress = [1,2,3] ##wanted base pressures
> print bestpress,'len bestpress is' , len(bestpress)
> 
> print len(Valves)
> print len(Valves)
> for j in range(len(Valves)):
> #for i in range(len(bestpress)):
>     #for j in range(len(Valves)):
>     for i in range(len(bestpress)-2):
>             if pressures [j]== bestpress[i] and bestpress [i+1]
> ==pressures [j+1] and bestpress [i+2]==pressures [j+2]:
>                 result.append(Valves[j])
>                 #i = i+1
>                 #j = j+1
>             # print i, j, bestpress[i]
>                 print "common PSVs are", result



From sjmachin at lexicon.net  Thu May 21 19:35:17 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 21 May 2009 16:35:17 -0700 (PDT)
Subject: dbfpy - cannot store new record
References: <4A153A10.1080906@shopzeus.com>
	<mailman.510.1242921221.8015.python-list@python.org>
Message-ID: <71b49836-d306-4399-9543-038ca69e9abb@v23g2000pro.googlegroups.com>

On May 22, 1:53?am, Laszlo Nagy <gand... at shopzeus.com> wrote:
> Here is the next problem. For boolean/logical fields, I can set their
> value to True/False easily. However, setting NULL seems impossible:
>
> rec = tbl.newRecord()
> rec["SOMEFIELD1"] = True # Works fine
> rec["SOMEFIELD2"] = False # Works fine
> rec["SOMEFIELD3"] = None # Will store False
> rec["SOMEFIELD3"] = 0 # Will store False
> rec["SOMEFIELD3"] = "" # Will store False
> rec["SOMEFIELD3"] = chr(32) # Will store False
> rec["SOMEFIELD3"] = chr(0) # Will store False
> rec.store()
>
> Strange thing: if I do not set the value of a numeric field, it becomes
> NULL. The same thing I cannot do for logical fields: if I do not set the
> value of a logical field, it becomes an invalid value, denoted with a
> question mark.

That's not "invalid", it *is* "NULL" according to DBF convention.



From rhodri at wildebst.demon.co.uk  Thu May 21 19:46:32 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 00:46:32 +0100
Subject: defaultdict's bug or feature?
In-Reply-To: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
Message-ID: <op.uua0bujla8ncjz@gnudebst>

On Thu, 21 May 2009 13:07:50 +0100, Red Forks <redforks at gmail.com> wrote:

> from collections import defaultdict
>
> d = defaultdict(set)
> assert isinstance(d['a'], set)
> assert isinstance(d.get('b'), set)
>
> d['a'] is ok, and a new set object is insert to d, but d.get('b') won't.
>
> It's a bug, or just a feature?

Feature.  You're blaming 'get' for doing exactly what it said it would,
both in returning None and not gratuitously altering the dictionary.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From pavlovevidence at gmail.com  Thu May 21 19:56:52 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 21 May 2009 16:56:52 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
Message-ID: <ddbcf4c6-132a-4ac8-ac6b-a19febc008c7@j12g2000vbl.googlegroups.com>

On May 21, 3:45?pm, norseman <norse... at hughes.net> wrote:
> Beyond that - just fix the money at 2, gas pumps at 3 and the
> sine/cosine at 8 and let it ride. :)


Or just use print.

>>> print 4.0/5.0
0.8

Since interactive prompt is usually used by programmers who are
inspecting values it makes a little more sense to print enough digits
to give unambiguous representation.


Carl Banks


From google at mrabarnett.plus.com  Thu May 21 20:01:02 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 22 May 2009 01:01:02 +0100
Subject: 4 hundred quadrillonth?
In-Reply-To: <r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.525.1242941777.8015.python-list@python.org>
	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
Message-ID: <4A15EB3E.2000006@mrabarnett.plus.com>

Grant Edwards wrote:
> On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
>> seanm.py at gmail.com schrieb:
>>> The explaination in my introductory Python book is not very
>>> satisfying, and I am hoping someone can explain the following to me:
>>>
>>>>>> 4 / 5.0
>>> 0.80000000000000004
>>>
>>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
>>> It bothers me.
>> Welcome to IEEE 754 floating point land! :)
> 
> Floating point is sort of like quantum physics: the closer you
> look, the messier it gets.
> 
I have the same feeling towards databases.


From bjruth at gmail.com  Thu May 21 20:12:37 2009
From: bjruth at gmail.com (byron)
Date: Thu, 21 May 2009 17:12:37 -0700 (PDT)
Subject: lxml: traverse xml tree and retrieve element based on an 
	attribute
References: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>
	<mailman.536.1242946630.8015.python-list@python.org>
Message-ID: <f93fade3-0aba-48a8-883b-8b67a4f46b48@s12g2000yqi.googlegroups.com>

On May 21, 6:57?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> byron wrote:
> > I am using the lxml.etree library to validate an xml instance file
> > with a specified schema that contains the data types of each element.
> > This is some of the internals of a function that extracts the
> > elements:
>
> > ? ? ? ? schema_doc = etree.parse(schema_fn)
> > ? ? ? ? schema = etree.XMLSchema(schema_doc)
>
> > ? ? ? ? context = etree.iterparse(xml_fn, events=('start', 'end'),
> > schema=schema)
>
> > ? ? ? ? # get root
> > ? ? ? ? event, root = context.next()
>
> > ? ? ? ? for event, elem in context:
> > ? ? ? ? ? ? if event == 'end' and elem.tag == self.tag:
> > ? ? ? ? ? ? ? ? yield elem
> > ? ? ? ? ? ? root.clear()
>
> > I retrieve a list of elements from this... and do further processing
> > to represent them in different ways. I need to be able to capture the
> > data type from the schema definition for each field in the element.
> > i.e.
>
> > ? ? <xsd:element name="concept">
> > ? ? ? ? <xsd:complexType>
> > ? ? ? ? ? ? <xsd:sequence>
> > ? ? ? ? ? ? ? ? <xsd:element ref="foo"/>
> > ? ? ? ? ? ? ? ? <xsd:element name="concept_id" type="xsd:string"/>
> > ? ? ? ? ? ? ? ? <xsd:element name="line" type="xsd:integer"/>
> > ? ? ? ? ? ? ? ? <xsd:element name="concept_value" type="xsd:string"/>
> > ? ? ? ? ? ? ? ? <xsd:element ref="some_date"/>
> > ? ? ? ? ? ? </xsd:sequence>
> > ? ? ? ? </xsd:complexType>
> > ? ? </xsd:element>
>
> > My thought is to recursively traverse through the schema definition
> > match the `name` attribute since they are unique to a `type` and
> > return that element. But I can't seem to make it quite work. All the
> > xml is valid, validation works, etc. This is what I have:
>
> > ? ? def find_node(tree, name):
> > ? ? ? ? for c in tree:
> > ? ? ? ? ? ? if c.attrib.get('name') == name:
> > ? ? ? ? ? ? ? ? return c
> > ? ? ? ? ? ? if len(c) > 0:
> > ? ? ? ? ? ? ? ? return find_node(c, name)
> > ? ? return 0
>
> You're searching the first child and then returning the result, but what
> you're looking for might not be in the first child; if it's not then you
> need to search the next child:
>
> ? ? ?def find_node(tree, name):
> ? ? ? ? ?for c in tree:
> ? ? ? ? ? ? ?if c.attrib.get('name') == name:
> ? ? ? ? ? ? ? ? ?return c
> ? ? ? ? ? ? ?if len(c) > 0:
> ? ? ? ? ? ? ? ? ?r = find_node(c, name)
> ? ? ? ? ? ? ? ? ?if r:
> ? ? ? ? ? ? ? ? ? ? ?return r
> ? ? ? ? ?return None
>
> > I may have been staring at this too long, but when something is
> > returned... it should be returned completely, no? This is what occurs
> > with `return find_node(c, name) if it returns 0. `return c` works
> > (used pdb to verify that), but the recursion continues and ends up
> > returning 0.
>
> > Thoughts and/or a different approach are welcome. Thanks
>
>

Thanks. Yes i tried something like this, but I think I overwrite `c`
when i wrote it, as in:

    if len(c) > 0:
        c = fin_node(c, name)
        if c is not None:
            return c

Thanks for you help.


From notontheweb at noisp.com  Thu May 21 20:19:06 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Thu, 21 May 2009 17:19:06 -0700
Subject: Cursor movement question
Message-ID: <3cmRl.90415$iW4.57403@en-nntp-01.dc1.easynews.com>

Howdy, folks.  I am using wxPython 2.8 on Windoze XP Pro.  I want my 
application to move the cursor and the mouse-point (the coordinates in 
the mouse-click events) to the left when the user presses the left-arrow 
key, up when they press the up-arrow key, etc..  I think I can figure 
out how to grab the arrow key events, but I can't find how to move the 
cursor.  I tried calling wx.SetCursorEvent(x,y), but no joy.

Can you help?

Thankee,
Jive


From gherron at islandtraining.com  Thu May 21 20:19:42 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 21 May 2009 17:19:42 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <4A15EB3E.2000006@mrabarnett.plus.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.525.1242941777.8015.python-list@python.org>	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
	<4A15EB3E.2000006@mrabarnett.plus.com>
Message-ID: <4A15EF9E.8070406@islandtraining.com>

MRAB wrote:
> Grant Edwards wrote:
>> On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
>>> seanm.py at gmail.com schrieb:
>>>> The explaination in my introductory Python book is not very
>>>> satisfying, and I am hoping someone can explain the following to me:
>>>>
>>>>>>> 4 / 5.0
>>>> 0.80000000000000004
>>>>
>>>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
>>>> It bothers me.
>>> Welcome to IEEE 754 floating point land! :)
>>
>> Floating point is sort of like quantum physics: the closer you
>> look, the messier it gets.

+1 as QOTW


And just to add one bit of clarity:  This problem has nothing to do with 
the OP's division of 4 by 5.0, but rather that the value of 0.8 itself 
cannot be represented exactly in IEEE 754.  Just try

 >>> print repr(0.8)  # No division needed
'0.80000000000000004'

Gary Herron





>>
> I have the same feeling towards databases.



From google at mrabarnett.plus.com  Thu May 21 20:27:39 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 22 May 2009 01:27:39 +0100
Subject: lxml: traverse xml tree and retrieve element based on an attribute
In-Reply-To: <f93fade3-0aba-48a8-883b-8b67a4f46b48@s12g2000yqi.googlegroups.com>
References: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>	<mailman.536.1242946630.8015.python-list@python.org>
	<f93fade3-0aba-48a8-883b-8b67a4f46b48@s12g2000yqi.googlegroups.com>
Message-ID: <4A15F17B.3040900@mrabarnett.plus.com>

byron wrote:
[snip]
> 
> Thanks. Yes i tried something like this, but I think I overwrite `c`
> when i wrote it, as in:
> 
>     if len(c) > 0:
>         c = fin_node(c, name)
>         if c is not None:
>             return c
> 
FYI, doing that won't actually matter in this case; 'c' will still be
bound to the next value on the next iteration of the loop because it's
just a reference to the iterator and 'assigning' won't affect the
iterator as in soem other languages.


From rob.clewley at gmail.com  Thu May 21 20:33:25 2009
From: rob.clewley at gmail.com (Rob Clewley)
Date: Thu, 21 May 2009 20:33:25 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <4A15EF9E.8070406@islandtraining.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
	<4A15EB3E.2000006@mrabarnett.plus.com>
	<4A15EF9E.8070406@islandtraining.com>
Message-ID: <a749952d0905211733n5a571e05v8e08f98d1c641521@mail.gmail.com>

On Thu, May 21, 2009 at 8:19 PM, Gary Herron <gherron at islandtraining.com> wrote:
> MRAB wrote:
>>
>> Grant Edwards wrote:
>>>
>>> On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
>>>>
>>>> seanm.py at gmail.com schrieb:
>>>>>
>>>>> The explaination in my introductory Python book is not very
>>>>> satisfying, and I am hoping someone can explain the following to me:
>>>>>
>>>>>>>> 4 / 5.0
>>>>>
>>>>> 0.80000000000000004
>>>>>
>>>>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
>>>>> It bothers me.
>>>>
>>>> Welcome to IEEE 754 floating point land! :)
>>>

FYI you can explore the various possible IEEE-style implementations
with my python simulator of arbitrary floating or fixed precision
numbers:

http://www2.gsu.edu/~matrhc/binary.html


From rhodri at wildebst.demon.co.uk  Thu May 21 20:38:04 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 01:38:04 +0100
Subject: ffmpeg and python big problem
In-Reply-To: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>
References: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>
Message-ID: <op.uua2pqtia8ncjz@gnudebst>

On Thu, 21 May 2009 22:48:33 +0100, TerabyteST <gabrycir at gmail.com> wrote:

> Hello. I am trying to make a video from images shot by my webcam in
> python. I use a module I found on the net (here
> http://osdir.com/ml/python.matplotlib.general/2005-10/msg00145.html )
> but, even if I think I am doing everything correctly, what I only get
> is a grey video with some multi-color squares on the top-left bit...

Obvious starter question: do you have ffmpeg properly compiled for
Windows (i.e. using Cygwin or MinGW)?

> I
> don't think it's a problem with ffmpeg because I tried with two
> different versions.

This is not a guarantee.  ffmpeg is wonderful when it works, and a
total pig when it doesn't.  Sometimes it's big and obvious about
not working and seg-faults on you, and sometimes it just does
something completely implausible with the information you give
it.

> Not even with the codec: i tried wmv, mpg, avi and
> everything, but still the same result.

The output vcodec doesn't matter as much as the input vcodec,
which is mjpeg.  I think webcams are mjpeg devices, but I've
never used one so I'm not sure.

> Last thing left,
> IMO, is the module, but I can't seem to find whats the problem... Is
> it because the module was (maybe) made on Linux and I'm working on
> windows? If you would help me I'd be so glad!

I'm not nearly so worried about the module being written on Linux as
ffmpeg.  The module is full of bad practice, but it doesn't do
anything os-specifically bad.

There is one further thing to check: your code that uses the module.
How do you feed data from the webcam to the VidStream object?  If
you're creating intermediate files of webcam stuff, please say
what they are and how they came to be.

I have to admit, if you've got images from your webcam in a file
already, I don't see why you aren't using ffmpeg directly.

> This program is for my friend and he needs it ready preety quick.

Aha. Ahahahahahahahaha.

Ahem.

Sorry, but "pretty quick" and "ffmeg" don't go together well in
my experience.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From bjruth at gmail.com  Thu May 21 20:41:32 2009
From: bjruth at gmail.com (byron)
Date: Thu, 21 May 2009 17:41:32 -0700 (PDT)
Subject: lxml: traverse xml tree and retrieve element based on an 
	attribute
References: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>
	<mailman.536.1242946630.8015.python-list@python.org>
	<f93fade3-0aba-48a8-883b-8b67a4f46b48@s12g2000yqi.googlegroups.com>
	<mailman.544.1242952060.8015.python-list@python.org>
Message-ID: <fe5e5965-750c-4073-bcc6-994c57dea553@h28g2000yqd.googlegroups.com>

On May 21, 8:27?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> byron wrote:
>
> [snip]
>
> > Thanks. Yes i tried something like this, but I think I overwrite `c`
> > when i wrote it, as in:
>
> > ? ? if len(c) > 0:
> > ? ? ? ? c = fin_node(c, name)
> > ? ? ? ? if c is not None:
> > ? ? ? ? ? ? return c
>
> FYI, doing that won't actually matter in this case; 'c' will still be
> bound to the next value on the next iteration of the loop because it's
> just a reference to the iterator and 'assigning' won't affect the
> iterator as in soem other languages.

Good to know. Thanks.


From redforks at gmail.com  Thu May 21 20:44:37 2009
From: redforks at gmail.com (Red Forks)
Date: Fri, 22 May 2009 08:44:37 +0800
Subject: defaultdict's bug or feature?
In-Reply-To: <op.uua0bujla8ncjz@gnudebst>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
	<op.uua0bujla8ncjz@gnudebst>
Message-ID: <3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>

You mean 'get' method should not alter the dict, does 'dict[key]' should not
alter the dict either?

d = defaultdict(set)
assert len(d) == 0
print d[1]
assert len(d) == 1

auto insert value to dict, when value is not in dict, is what defaultdict
try to do.

On Fri, May 22, 2009 at 7:46 AM, Rhodri James
<rhodri at wildebst.demon.co.uk>wrote:

> On Thu, 21 May 2009 13:07:50 +0100, Red Forks <redforks at gmail.com> wrote:
>
>  from collections import defaultdict
>>
>> d = defaultdict(set)
>> assert isinstance(d['a'], set)
>> assert isinstance(d.get('b'), set)
>>
>> d['a'] is ok, and a new set object is insert to d, but d.get('b') won't.
>>
>> It's a bug, or just a feature?
>>
>
> Feature.  You're blaming 'get' for doing exactly what it said it would,
> both in returning None and not gratuitously altering the dictionary.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From aahz at pythoncraft.com  Thu May 21 20:49:07 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 May 2009 17:49:07 -0700
Subject: Streaming pdf with URLLib
References: <04eacd56-5293-4553-bdb3-ad2e8266c6b0@z7g2000vbh.googlegroups.com>
Message-ID: <gv4sq3$8gj$1@panix3.panix.com>

In article <04eacd56-5293-4553-bdb3-ad2e8266c6b0 at z7g2000vbh.googlegroups.com>,
Scooter  <slbentley at gmail.com> wrote:
>
>#!/usr/bin/python
>
>import urllib
>
>u = urllib.urlopen('https://myinternal.server/pdfs/pdfstreamer.aspx')
>print 'Content-type: application/pdf\n\n'
># print 'Content-type: application/x-msdownload; name=\"FileName\"\n
>\n'
># print 'Content-Dispostion: attachment; filename=\"FileName\"\r\n\n'
>
>pdfdoc = u.read()
>print pdfdoc
>
>Hitting my pdfstreamer.aspx app directly through a browser renders a
>pdf just fine. So now I'm attempting to use this python app on an
>external webserver, access it as a cgi, to pull the pdf, and then re-
>render it, but at that point it just shows me the raw pdf in
>the browser.

What application type does the browser report?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From rdmurray at bitdance.com  Thu May 21 20:50:48 2009
From: rdmurray at bitdance.com (R. David Murray)
Date: Fri, 22 May 2009 00:50:48 +0000 (UTC)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
	<4A15EB3E.2000006@mrabarnett.plus.com>
	<4A15EF9E.8070406@islandtraining.com>
Message-ID: <gv4st8$11t$1@ger.gmane.org>

Gary Herron <gherron at islandtraining.com> wrote:
> MRAB wrote:
> > Grant Edwards wrote:
> >> On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
> >>> seanm.py at gmail.com schrieb:
> >>>> The explaination in my introductory Python book is not very
> >>>> satisfying, and I am hoping someone can explain the following to me:
> >>>>
> >>>>>>> 4 / 5.0
> >>>> 0.80000000000000004
> >>>>
> >>>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> >>>> It bothers me.
> >>> Welcome to IEEE 754 floating point land! :)
> >>
> >> Floating point is sort of like quantum physics: the closer you
> >> look, the messier it gets.
> 
> +1 as QOTW
> 
> And just to add one bit of clarity:  This problem has nothing to do with 
> the OP's division of 4 by 5.0, but rather that the value of 0.8 itself 
> cannot be represented exactly in IEEE 754.  Just try
> 
>  >>> print repr(0.8)  # No division needed
> '0.80000000000000004'

Python 3.1b1+ (py3k:72432, May  7 2009, 13:51:24) 
[GCC 4.1.2 (Gentoo 4.1.2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 4 / 5.0
0.8
>>> print(repr(0.8))
0.8

In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
point algorithm for Python so that the shortest repr that will round
trip correctly is what is used as the floating point repr....

--David



From google at mrabarnett.plus.com  Thu May 21 20:55:00 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 22 May 2009 01:55:00 +0100
Subject: defaultdict's bug or feature?
In-Reply-To: <3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>	<op.uua0bujla8ncjz@gnudebst>
	<3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
Message-ID: <4A15F7E4.2010600@mrabarnett.plus.com>

Red Forks wrote:
> You mean 'get' method should not alter the dict, does 'dict[key]' should 
> not alter the dict either?
> 
> d = defaultdict(set)
> assert len(d) == 0
> print d[1]
> assert len(d) == 1
> 
> auto insert value to dict, when value is not in dict, is what 
> defaultdict try to do.
> 
That's the behaviour which makes defaultdict so useful. Compare using
defaultdict:

     d = defaultdict(int)

and then:

     d["foo"] += 1

to using dict:

     d = {}

and then:

     try:
         d["foo"] += 1
     except KeyError:
         d["foo"] = 1

or:

     d["foo"] = d.get("foo", 0) + 1


From rhodri at wildebst.demon.co.uk  Thu May 21 21:12:38 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 02:12:38 +0100
Subject: Is there a better way to chose a slice of a list?
In-Reply-To: <83650e78-b0e9-4dcb-a0ff-ec369794a1d8@b7g2000pre.googlegroups.com>
References: <bf149e5e-aeb0-4d14-9308-9ccda1591d03@d25g2000prn.googlegroups.com>
	<6b004ea2-e4e3-4160-a6bf-4a217b13a4a8@s31g2000vbp.googlegroups.com>
	<940bc229-9d57-4e8a-acfd-fdaad43f7eab@b7g2000pre.googlegroups.com>
	<873ab07jpx.fsf@benfinney.id.au>
	<83650e78-b0e9-4dcb-a0ff-ec369794a1d8@b7g2000pre.googlegroups.com>
Message-ID: <op.uua4bcqia8ncjz@gnudebst>

On Wed, 20 May 2009 17:08:08 +0100, walterbyrd <walterbyrd at iname.com>  
wrote:

> I am processing a huge spreadsheet which I have converted to a csv
> format. Each row will be a wiki page with several sub-headings. The
> spreadsheet contains information about servers. Wiki sub-headings may
> include: 'hardware', 'software', 'users', 'network swith settings'.
> 'Hardware' may include the spreadsheet columns: 'memory', 'cpu', and
> so on. So the first six columns in the spreadsheet may go under
> 'hardware' the next six under 'software' and so on.
>
> I have already created the wiki pages, using a method similar to what
> I first posted. But, it seems like there should be a better way to to
> do it. So, for future reference, I was just wondering.

Given that you're already making presumptions about the nature of your
data, named constants or enums are the most concise thing to use together
with a quick check of the column header row to make sure that the
constants really do refer to the right columns.

If you want something a little more bullet-proof, create a dictionary
mapping the column headers (as read in) to column numbers and use that
to generate the slice limits.  Since that still relies on the column
headers being what you expect them to be, and at least partially in the
order you expect them to be, it's probably not enough of a win to bother
with.

Trying to slice a list by value is never going to look pretty because
lists aren't designed to be indexed by value.  Worse, if you were
doing this a lot (as you imply) then it's going to be horribly
inefficient, since you're doing an extra two (or more) O(n) searches
for every row.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gherron at islandtraining.com  Thu May 21 21:30:17 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 21 May 2009 18:30:17 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <gv4st8$11t$1@ger.gmane.org>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.525.1242941777.8015.python-list@python.org>	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>	<4A15EB3E.2000006@mrabarnett.plus.com>	<4A15EF9E.8070406@islandtraining.com>
	<gv4st8$11t$1@ger.gmane.org>
Message-ID: <4A160029.5040204@islandtraining.com>

R. David Murray wrote:
> Gary Herron <gherron at islandtraining.com> wrote:
>   
>> MRAB wrote:
>>     
>>> Grant Edwards wrote:
>>>       
>>>> On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
>>>>         
>>>>> seanm.py at gmail.com schrieb:
>>>>>           
>>>>>> The explaination in my introductory Python book is not very
>>>>>> satisfying, and I am hoping someone can explain the following to me:
>>>>>>
>>>>>>             
>>>>>>>>> 4 / 5.0
>>>>>>>>>                   
>>>>>> 0.80000000000000004
>>>>>>
>>>>>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
>>>>>> It bothers me.
>>>>>>             
>>>>> Welcome to IEEE 754 floating point land! :)
>>>>>           
>>>> Floating point is sort of like quantum physics: the closer you
>>>> look, the messier it gets.
>>>>         
>> +1 as QOTW
>>
>> And just to add one bit of clarity:  This problem has nothing to do with 
>> the OP's division of 4 by 5.0, but rather that the value of 0.8 itself 
>> cannot be represented exactly in IEEE 754.  Just try
>>
>>  >>> print repr(0.8)  # No division needed
>> '0.80000000000000004'
>>     
>
> Python 3.1b1+ (py3k:72432, May  7 2009, 13:51:24) 
> [GCC 4.1.2 (Gentoo 4.1.2)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>   
>>>> 4 / 5.0
>>>>         
> 0.8
>   
>>>> print(repr(0.8))
>>>>         
> 0.8
>
> In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
> point algorithm for Python so that the shortest repr that will round
> trip correctly is what is used as the floating point repr....
>
> --David
>   

Which won't change the fact that 0.8 and lots of other favorite floats 
are still not representable exactly, but it will hide this fact from 
most newbies.  One of the nicer results of this will be that these 
(almost) weekly questions and discussions will be come a thing of the 
past. 

With a sigh of relief,
Gary Herron







From danb_83 at yahoo.com  Thu May 21 21:56:08 2009
From: danb_83 at yahoo.com (AggieDan04)
Date: Thu, 21 May 2009 18:56:08 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
Message-ID: <1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>

On May 21, 5:45?pm, norseman <norse... at hughes.net> wrote:
> seanm... at gmail.com wrote:
> > The explaination in my introductory Python book is not very
> > satisfying, and I am hoping someone can explain the following to me:
>
> >>>> 4 / 5.0
> > 0.80000000000000004
>
> > 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> > It bothers me.
>
> ======================================
>
> Machine architecture, actual implementation of logic on the chip and
> what the compiler maker did all add up to creating rounding errors. I
> have read where python, if left to its own, will output everything it
> computed. I guess the idea is to show
> ? ? ? ? 1) python's accuracy and
> ? ? ? ? 2) what was left over
> so the picky people can have something to gnaw on.

If you want to be picky, the exact value is
0.8000000000000000444089209850062616169452667236328125 (i.e.,
3602879701896397/2**52).  Python's repr function rounds numbers to 17
significant digits.  This is the minimum that ensures that float(repr
(x)) == x for all x (using IEEE 754 double precision).

> Astrophysics, Astronomers and like kind may have wants of such.
> If you work much in finite math you may want to test the combo to see if
> ? it will allow the accuracy you need. Or do you need to change machines?

The error in this example is roughly equivalent to the width of a red
blood cell compared to the distance between Earth and the sun.  There
are very few applications that need more accuracy than that.




From danb_83 at yahoo.com  Thu May 21 22:01:03 2009
From: danb_83 at yahoo.com (AggieDan04)
Date: Thu, 21 May 2009 19:01:03 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<3bcc27a7-3298-4310-8f61-b3a783e675b4@o30g2000vbc.googlegroups.com> 
	<mailman.534.1242945407.8015.python-list@python.org>
Message-ID: <e3e43d5a-3e48-4894-a91b-ffc45089baa4@b34g2000pra.googlegroups.com>

On May 21, 5:36?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, May 21, 2009 at 2:53 PM, Carl Banks <pavlovevide... at gmail.com> wrote:
> > On May 21, 2:05?pm, seanm... at gmail.com wrote:
> >> The explaination in my introductory Python book is not very
> >> satisfying, and I am hoping someone can explain the following to me:
>
> >> >>> 4 / 5.0
>
> >> 0.80000000000000004
>
> >> 4 / 5.0 is 0.8. No more, no less.
...
>
> The `decimal` module's Decimal type is also an option to consider:
>
> Python 2.6.2 (r262:71600, May 14 2009, 16:34:51)
> >>> from decimal import Decimal
> >>> Decimal(4)/Decimal(5)
>
> Decimal('0.8')

>>> Decimal(1) / Decimal(3) * 3
Decimal("0.9999999999999999999999999999")
>>> Decimal(2).sqrt() ** 2
Decimal("1.999999999999999999999999999")

Decimal isn't a panacea for floating-point rounding errors.  It also
has the disadvantage of being much slower.

It is useful for financial applications, in which an exact value for
0.01 actually means something.


From davea at ieee.org  Thu May 21 22:13:45 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 21 May 2009 22:13:45 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <a749952d0905211733n5a571e05v8e08f98d1c641521@mail.gmail.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.525.1242941777.8015.python-list@python.org>	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>	<4A15EB3E.2000006@mrabarnett.plus.com>	<4A15EF9E.8070406@islandtraining.com>
	<a749952d0905211733n5a571e05v8e08f98d1c641521@mail.gmail.com>
Message-ID: <4A160A59.6050008@ieee.org>

Rob Clewley wrote:
> On Thu, May 21, 2009 at 8:19 PM, Gary Herron <gherron at islandtraining.com> wrote:
>   
>> MRAB wrote:
>>     
>>> Grant Edwards wrote:
>>>       
>>>> On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
>>>>         
>>>>> seanm.py at gmail.com schrieb:
>>>>>           
>>>>>> The explaination in my introductory Python book is not very
>>>>>> satisfying, and I am hoping someone can explain the following to me:
>>>>>>
>>>>>>             
>>>>>>>>> 4 / 5.0
>>>>>>>>>                   
>>>>>> 0.80000000000000004
>>>>>>
>>>>>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
>>>>>> It bothers me.
>>>>>>             
>>>>> Welcome to IEEE 754 floating point land! :)
>>>>>           
>
> FYI you can explore the various possible IEEE-style implementations
> with my python simulator of arbitrary floating or fixed precision
> numbers:
>
> http://www2.gsu.edu/~matrhc/binary.html
>
>   

It was over 40 years ago I studied Fortran, with the McCracken book.  
There were big warnings in it about the hazards of binary floating 
point.  This was long before the IEEE
 754, Python, Java, or even C.

In any floating point system with finite precision, there will be some 
numbers that cannot be represented exactly.  Beginning programmers 
assume that if you can write it exactly, the computer should understand 
it exactly as well.  (That's one of the reasons the math package I 
microcoded a few decades ago was base 10).

If you try to write 1/3 in decimal notation, you either have to write 
forever, or truncate it somewhere.  The only fractions that terminate 
are those that have a denominator (in lowest terms) comprised only of 
powers of 2 and 5.  So 4/10 can be represented, and so can 379/625.  Any 
other fraction, like 1/7, or 3/91 will make a repeating decimal, 
sometimes taking many digits to repeat, but not repeating with zeroes.

In binary fractions, the rule is similar, but only for powers of 2.  If 
there's a 5 in there, it cannot be represented exactly.

So people learn to use integers, or rational numbers (fractions), or 
decimal representations, depending on what values they're willing to 
have be approximate.

Something that escapes many people is that even when there's an error 
there, sometimes converting it back to decimal hides the error.  So 0.4 
might have an error on the right end, but 0.7 might happen to look good.

Thanks for providing tools that let people play.

An anecdote from many years ago (1975) -- I had people complain about my 
math package, that cos(pi/2) was not zero.  It was something times 
10**-13, but still not zero.  And they wanted it to be zero.  If 
somebody set the math package to work in degrees, they'd see that 
cos(90) was in fact zero.   Why the discrepancy?  Well,  you can't 
represent pi/2 exactly, (in any floating point or fraction system, it's 
irrational).  So if you had a perfect cos package, but give it a number 
that's off just a little from a right angle, you'd expect the answer to 
be off a little from zero.  Turns out that (in a 13 digit floating point 
package), the value was the next 13 digits of pi/2.  And 12 of them were 
accurate.  I was pleased as punch.




From rhodri at wildebst.demon.co.uk  Thu May 21 22:35:41 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 03:35:41 +0100
Subject: finding repeated data sequences in a column
In-Reply-To: <f0c45029-3983-4a84-8f08-2b497594c03e@r34g2000vbi.googlegroups.com>
References: <24f6fbbf-4c39-4dcd-8bde-584ff141ac54@q14g2000vbn.googlegroups.com>
	<b91298fd-172f-4ba7-9a72-5615a04b40a0@n4g2000vba.googlegroups.com>
	<ffd0d78a-775d-4d0f-ae2c-0205ef9f4a76@z19g2000vbz.googlegroups.com>
	<c4759cf5-b21d-45ea-845c-0e403dd39e0b@z5g2000vba.googlegroups.com>
	<mailman.456.1242841999.8015.python-list@python.org>
	<f0c45029-3983-4a84-8f08-2b497594c03e@r34g2000vbi.googlegroups.com>
Message-ID: <op.uua75rova8ncjz@gnudebst>

On Thu, 21 May 2009 08:55:45 +0100, yadin <conra2004 at yahoo.com> wrote:

> this is the program...I wrote but is not working
> I have a list of valves, and another of pressures;
> If I am ask to find out which ones are the valves that are using all
> this set of pressures, wanted best pressures
> this is the program i wrote but is not working properly, it suppossed
> to return in the case
> find all the valves that are using pressures 1 "and" 2 "and" 3.

So if I understand you correctly, you actually want to split your
data up by valve name to find each valve that has listed pressures of
1, 2 and 3 in that order?  That's a lot simpler, though it has to be
said that your data isn't in a terribly convenient format.

> It returns me A, A2, A35....
> The correct answer supposed to be A and A2...
> if I were asked for pressures 56 and 78 the correct answer supossed to
> be valves G and G2...

Ah, so the target "best" pressure sequence doesn't have to be all of the
values listed.  Hmm.  Here goes...

====HERE BE CODE====

 from itertools import izip, groupby

VALVES = ['A','A','A','G', 'G', 'G',
           'C','A2','A2','A2','F','G2',
           'G2','G2','A35','A345','A4'] ##valve names
PRESSURES = [1,2,3,4235,56,78,
              12, 1, 2, 3, 445, 45,
              56,78, 1, 23,7] ## valve pressures
TARGET = [1, 2, 3]

target_len = len(TARGET) # Since we're using this a lot
result = []

for valve, p in groupby(izip(VALVES, PRESSURES),
                         key=lambda x: x[0]):
   pressures = [x[1] for x in p]
   for i in xrange((len(pressures) - target_len) + 1):
     if pressures[i:i+target_len] == TARGET:
       result.append(valve)
       break

print "The answer you want is", result

====HERE ENDETH THE CODE====

Not terribly pretty largely because of having to do sublist
matching, but it should work for most "best pressures".

The unfamiliar looking stuff are functions from the iterator
toolkit that make this a lot simpler.  If you don't get what's
going on here, I don't blame you.  I just deleted my attempt
to explain it because it was confusing me :-)  Reading the
descriptions of izip and groupby in the standard library
documentation should make things clearer.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From walterbyrd at iname.com  Thu May 21 22:42:18 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Thu, 21 May 2009 19:42:18 -0700 (PDT)
Subject: When does the escape character work within raw strings?
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
Message-ID: <3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>

I guess I am confused about when when escape characters are are
interpersonal as escape characters, and escape characters are not
treated as escape characters.

Sometimes escape characters in regular strings are treated as escape
characters, sometimes not. Same seems to go for raw strings. So how do
I know?

IMO: '\' characters in raw strings should not be given any special
meaning. That would also solve the common problem of r'c:\whatever\'
not working in python. But I digress.


To me this does not seem right. r'\n' should not equal '\n'

>>> s = 'x\nx'
>>> a = re.sub('\n', 'x', s)
>>> a
'xxx'
>>> a = re.sub(r'\n', 'x', s)
>>> a
'xxx'
>>>



From notontheweb at noisp.com  Thu May 21 22:58:33 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Thu, 21 May 2009 19:58:33 -0700
Subject: Cursor movement question
In-Reply-To: <3cmRl.90415$iW4.57403@en-nntp-01.dc1.easynews.com>
References: <3cmRl.90415$iW4.57403@en-nntp-01.dc1.easynews.com>
Message-ID: <wxoRl.328387$Yx2.227908@en-nntp-06.dc1.easynews.com>

Gosh, you guys are slow. :-) I figured it out.


From rhodri at wildebst.demon.co.uk  Thu May 21 23:44:15 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 04:44:15 +0100
Subject: When does the escape character work within raw strings?
In-Reply-To: <3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
Message-ID: <op.uubbb1cea8ncjz@gnudebst>

On Fri, 22 May 2009 03:42:18 +0100, walterbyrd <walterbyrd at iname.com>  
wrote:

> I guess I am confused about when when escape characters are are
> interpersonal as escape characters, and escape characters are not
> treated as escape characters.

No, you're confused about the number of entirely different things
that are interpreting a string, and the difference between a string
literal and a string object.

> Sometimes escape characters in regular strings are treated as escape
> characters, sometimes not. Same seems to go for raw strings. So how do
> I know?
>
> IMO: '\' characters in raw strings should not be given any special
> meaning. That would also solve the common problem of r'c:\whatever\'
> not working in python. But I digress.

Escaping the delimiting quote is the *one* time backslashes have a
special meaning in raw string literals.

> To me this does not seem right. r'\n' should not equal '\n'

And it doesn't.  Let me explain.  No, that would take too long,
let me summarise. :-)

>>>> s = 'x\nx'

`s` is a string object containing the character 'x', a newline, and 'x'.

>>>> a = re.sub('\n', 'x', s)

This calls re.sub with a pattern string object that contains a single
newline character.  Since this character has no special meaning to the
sub function it faithfully searches `s` for newlines, and, finding one,
replaces it with an 'x' character.

>>>> a = re.sub(r'\n', 'x', s)

This calls re.sub with a pattern string object that contains two
characters, a backslash followed by an 'n'.  This combination *does*
have a special meaning to the sub function, which does it's own
translation of the pattern into a single newline character.  Then,
as before, it spots the newline in `s` and replaces it with an 'x'.

Note, however, that the string object created by the raw string literal
was *two* characters long.  It's re.sub (in common with the rest of the
re module functions) that chooses to interpret the backslash specially.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Fri May 22 00:17:52 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 05:17:52 +0100
Subject: Adding a Par construct to Python?
In-Reply-To: <16b51c17-b293-461e-8e87-efed1d35e5ba@o30g2000vbc.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
	<16b51c17-b293-461e-8e87-efed1d35e5ba@o30g2000vbc.googlegroups.com>
Message-ID: <op.uubcv2ufa8ncjz@gnudebst>

On Wed, 20 May 2009 09:19:50 +0100, <jeremy at martinfamily.freeserve.co.uk>  
wrote:

> On 20 May, 03:43, Steven D'Aprano
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> On Tue, 19 May 2009 03:57:43 -0700, jeremy wrote:
>> > As I wrote before, concurrency is one of the hardest things for
>> > professional programmers to grasp. For 'amateur' programmers we need  
>> to
>> > make it as simple as possible,

Here, I think, is the fatal flaw in your plan.  As Steven pointed out,
concurrency isn't simple.  All you are actually doing is making it
easier for 'amateur' programmers to write hard-to-debug buggy code,
since you seem to be trying to avoid making them think about how to
write parallelisable code at all.

> I *do* actually know a bit about concurrency and would never imply
> that *any* for loop could be converted to a parallel one. The
> intention of my remark "with my suggestion they could potentially get
> a massive speed up just by changing 'for' to 'par' or 'map' to
> 'pmap'." is that it could be applied in the particular circumstances
> where there are no dependencies between different iterations of the
> loop.

If you can read this newsgroup for a week and still put your hand on
your heart and say that programmers will check that there are no
dependencies before swapping 'par' for 'for', I want to borrow your
rose-coloured glasses.  That's not to say this isn't the right solution,
but you must be aware that people will screw this up very, very
regularly, and making the syntax easy will only up the frequency of
screw-ups.

> This shows why the sync event is needed - to avoid  race conditions on
> shared variables. It is borrowed from the BSP paradigm - although that
> is a distibuted memory approach. Without the sync clause, rule 5 would
> just be the standard way of defining a parallelisable loop.

Pardon my cynicism but sync would appear to have all the disadvantages
of message passing (in terms of deadlock opportunities) with none of
advantages (like, say, actual messages).  The basic single sync you put
forward may be coarse-grained enough to be deadlock-proof, but I would
need to be more convinced of that than I am at the moment before I was
happy.

> P.S. I have a couple of additional embellishments to share at this
> stage:
[snip]
> 2. Scope of the 'sync' command. It was pointed out to me by a
> colleague that I need to define what happens with sync when there are
> nested par loops. I think that it should be defined to apply to the
> innermost par construct which encloses the statement.

What I said before about deadlock-proofing?  Forget it.  There's hours
of fun to be had once you introduce scoping, not to mention the fact
that your inner loops can't now be protected against common code in the
outer loop accessing the shared variables.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Fri May 22 00:35:39 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 05:35:39 +0100
Subject: defaultdict's bug or feature?
In-Reply-To: <3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
	<op.uua0bujla8ncjz@gnudebst>
	<3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
Message-ID: <op.uubdppr7a8ncjz@gnudebst>

Please don't top-post, it makes the thread of argument hard to follow.

On Fri, 22 May 2009 01:44:37 +0100, Red Forks <redforks at gmail.com> wrote:

> You mean 'get' method should not alter the dict, does 'dict[key]' should  
> not
> alter the dict either?
>
> d = defaultdict(set)
> assert len(d) == 0
> print d[1]
> assert len(d) == 1
>
> auto insert value to dict, when value is not in dict, is what defaultdict
> try to do.

Behaviour you are deliberately avoiding by calling `get`, since that
explicitly behaves the same way that it does for dicts.  You're doing
two different things through two different interfaces with two different
specs.  Why are you expecting them to have the same effect?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From george.sakkis at gmail.com  Fri May 22 01:13:32 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Thu, 21 May 2009 22:13:32 -0700 (PDT)
Subject: Wrapping methods of built-in dict
References: <c60e66f1-0bb0-45e6-951f-c8909df7ea11@w35g2000prg.googlegroups.com>
	<pan.2009.05.21.02.31.28@REMOVE.THIS.cybersource.com.au>
	<6f21d89b-755d-40b8-a42b-0510e5580f93@g22g2000pra.googlegroups.com>
Message-ID: <e45fc0ef-d446-4674-8541-d3c6f1634764@y7g2000yqa.googlegroups.com>

On May 21, 5:55?pm, shailesh <kochhar... at gmail.com> wrote:

> There doesn't seem to be a predicate returning method wrappers. Is
> there an alternate way to query an object for attributes that are of
> method wrappers?

Sure:
>>> MethodWrapper = type({}.__init__)
>>> isinstance([].__len__, MethodWrapper)
True

But you're better off catching everything by checking with callable()
(or equivalently hasattr(obj, '__call__')).

> This exercise also makes me question if I'm going about this
> correctly. If I want to add functionality to the methods of a class or
> an object are decorators and the inspect module the pythonic way to go
> about it? I can think of alternative implementations either through
> metaclasses or proxy objects.

In my experience, it's quite unlikely to really want to decorate
indiscriminately *all* methods of a class/instance, let alone all the
special methods (e.g. __getattribute__ very rarely needs to be
overridden). Do you have an actual use case or are you just playing
around ?

George


From timr at probo.com  Fri May 22 01:16:58 2009
From: timr at probo.com (Tim Roberts)
Date: Thu, 21 May 2009 22:16:58 -0700
Subject: monitoring friendly applications
References: <4a13cebd$0$9377$426a74cc@news.free.fr>
Message-ID: <t9dc15pbsvhr3hbhkb2461phkd32t196jr@4ax.com>

Imbaud Pierre <pierre.imbaud at gmail.com> wrote:
>
>I have A LOT of batch applications to monitor, on linux machines, mostly 
>written in python.
>I have to know:
>- which are active, at a given moment?
>- when did the last run occur? How long did it last?
>- for some daemons: are they stuck? generally, waiting for i/o, or lost 
>in some C call.
>...
>By any chance, does something like this exist? Would someone be 
>interested with this development?

http://www.letmegooglethatforyou.com?q=python+daemon+tools
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From timr at probo.com  Fri May 22 01:19:51 2009
From: timr at probo.com (Tim Roberts)
Date: Thu, 21 May 2009 22:19:51 -0700
Subject: making a python program in windows
References: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>
	<mailman.518.1242932391.8015.python-list@python.org>
Message-ID: <vcdc15hqiokji7cgeck0rkn9i2g1hh5rmv@4ax.com>

Dave Angel <davea at ieee.org> wrote:
>
>Anyway, now you can see two batch files you could use to make a 
>particular version of Python active.  The first one uses assoc and ftype 
>to fix the asssociations. And the other changes the environment variable 
>PATHEXT to make the extension optional.  Note that changing the 
>environment variable is effective only for that DOS box, and its 
>children.  If you want a permanent change, you need to change the 
>registry, probably at
>   hklm\SYSTEM\ControlSet001\Contro/Session\Session 
>Manager\Environment\PATHEXT

The better way to do this is to bring up the System control panel applet
(shortcut: WindowsKey + Pause/Break), Advanced, Environment Variables.  In
the System variables, click PATHEXT and Edit, and add ;.PY;.PYW to the end.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From andreengels at gmail.com  Fri May 22 02:31:21 2009
From: andreengels at gmail.com (Andre Engels)
Date: Fri, 22 May 2009 08:31:21 +0200
Subject: 4 hundred quadrillonth?
In-Reply-To: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
Message-ID: <6faf39c90905212331r3f11f53bu3fdbd2719ccb1e6a@mail.gmail.com>

On Thu, May 21, 2009 at 11:05 PM,  <seanm.py at gmail.com> wrote:
> The explaination in my introductory Python book is not very
> satisfying, and I am hoping someone can explain the following to me:
>
>>>> 4 / 5.0
> 0.80000000000000004
>
> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
> It bothers me.

Well, how much would 1 / 3.0 be? Maybe 0.3333333333... with a certain
(large) number of threes? And if you multiply that by 3, will it be
1.0 again? No, because you cannot represent 1/3.0 as a precise decimal
fraction.

Internally, what is used are not decimal but binary fractions. And as
a binary fraction, 4/5.0 is just as impossible to represent as 1/3.0
is (1/3.0 = 0.0101010101... and 4/5.0 = 0.110011001100... to be
exact). So 4 / 5.0 gives you the binary fraction of a certain
precision that is closest to 0.8. And apparently that is close to
0.80000000000000004


-- 
Andr? Engels, andreengels at gmail.com


From gandalf at shopzeus.com  Fri May 22 02:34:17 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 22 May 2009 08:34:17 +0200
Subject: dbfpy - cannot store new record
In-Reply-To: <71b49836-d306-4399-9543-038ca69e9abb@v23g2000pro.googlegroups.com>
References: <4A153A10.1080906@shopzeus.com>	<mailman.510.1242921221.8015.python-list@python.org>
	<71b49836-d306-4399-9543-038ca69e9abb@v23g2000pro.googlegroups.com>
Message-ID: <4A164769.5050802@shopzeus.com>


>> Here is the next problem. For boolean/logical fields, I can set their
>> value to True/False easily. However, setting NULL seems impossible:
>>
>> rec = tbl.newRecord()
>> rec["SOMEFIELD1"] = True # Works fine
>> rec["SOMEFIELD2"] = False # Works fine
>> rec["SOMEFIELD3"] = None # Will store False
>> rec["SOMEFIELD3"] = 0 # Will store False
>> rec["SOMEFIELD3"] = "" # Will store False
>> rec["SOMEFIELD3"] = chr(32) # Will store False
>> rec["SOMEFIELD3"] = chr(0) # Will store False
>> rec.store()
>>
>> Strange thing: if I do not set the value of a numeric field, it becomes
>> NULL. The same thing I cannot do for logical fields: if I do not set the
>> value of a logical field, it becomes an invalid value, denoted with a
>> question mark.
>>     
>
> That's not "invalid", it *is* "NULL" according to DBF convention.
>   
Now I also tried to set -1. In any of the above cases, if I open that 
dbf file with a commercial DBF editor application then I see that the 
value is not null.

- Borland Database Desktop shows "False" value
- CDBF shows an invalid value, noted with a question mark (screenshot 
attached)

Best,

   Laszlo



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From david.lyon at preisshare.net  Fri May 22 02:35:54 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Fri, 22 May 2009 02:35:54 -0400
Subject: dbfpy - cannot store new record
In-Reply-To: <4A164769.5050802@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com>	<mailman.510.1242921221.8015.python-list@python.org>
	<71b49836-d306-4399-9543-038ca69e9abb@v23g2000pro.googlegroups.com>
	<4A164769.5050802@shopzeus.com>
Message-ID: <89b96c19c29ffa4439c1f4cb9a26efda@preisshare.net>

On Fri, 22 May 2009 08:34:17 +0200, Laszlo Nagy <gandalf at shopzeus.com>
wrote:
> Now I also tried to set -1. In any of the above cases, if I open that 
> dbf file with a commercial DBF editor application then I see that the 
> value is not null.
> 
> - Borland Database Desktop shows "False" value
> - CDBF shows an invalid value, noted with a question mark (screenshot 
> attached)

dbfpy is very old code.....

Try setting up a CHAR(1) field and filling it with "Y" or "N" or
"T" or "F".. indicating yes,no,true or false...

This might be an easier solution...

otherwise... just debug the dbfpy code...


David



From gagsl-py2 at yahoo.com.ar  Fri May 22 03:00:57 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 22 May 2009 04:00:57 -0300
Subject: A question regd configobj
References: <5ead360a0905210423q526e21ffgad3be1415ac148dd@mail.gmail.com>
Message-ID: <op.uubkfvefx6zn5v@lepton.softlabbsas.com.ar>

En Thu, 21 May 2009 08:23:36 -0300, Srijayanth Sridhar  
<srijayanth at gmail.com> escribi?:

> I am wondering if it is possible to have hexadecimal strings in a ini  
> file
> and have configobj parse it correctly.
>
> for eg:
> moonwolf at trantor:~/python/config$ cat foo
> foo="\x96\x97"
> .
> .
> .
>>>> a=ConfigObj("foo")
>>>> a
> ConfigObj({'foo': '\\x96\\x97'})
>>>> a['foo']
> '\\x96\\x97'

Use the "string-escape" codec to decode that:

py> x = '\\x96\\x97'
py> x.decode("string-escape")
'\x96\x97'

You can decode more-or-less automatically the whole config file, using the  
walk method. See  
http://www.voidspace.org.uk/python/configobj.html#walking-a-section (the  
example covers exactly this use case)

-- 
Gabriel Genellina



From rustompmody at gmail.com  Fri May 22 03:15:32 2009
From: rustompmody at gmail.com (rustom)
Date: Fri, 22 May 2009 00:15:32 -0700 (PDT)
Subject: making a python program in windows
References: <mailman.488.1242897741.8015.python-list@python.org> 
	<l-OdnQ3QTPFTt4jXnZ2dnUVZ8tJi4p2d@bt.com>
	<c361a5d5-e63a-4117-8c55-21ae31245ff2@b6g2000pre.googlegroups.com>
	<Xns9C1284B6480C9duncanbooth@127.0.0.1>
Message-ID: <7530b645-d6dc-483a-94ed-0dfbe9331ee2@d7g2000prl.googlegroups.com>

On May 21, 5:09?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> rustom <rustompm... at gmail.com> wrote:
> > i suppose the question is entirely about setting properly (and
> > grokking) file associations -- why is a .py file associated with
> > pythonw and not python? And is making this association right enough to
> > make a .py file in windows behave like a shebang file in unix?
>
> I think the question about the file association is one you have to answer
> for yourself. When you install Python it associates .pyw with pythonw and
> .py with python. If something on your system has changed this the best
> thing you can do is to change it back.
>
> Try typing the following commands and then fixing any differences by typing
> the expected output as the command parameter
> (e.g. "assoc .py=Python.File"):
>
> C:\>assoc .py
> .py=Python.File
>
> C:\>assoc .pyw
> .pyw=Python.NoConFile
>
> C:\>ftype Python.file
> Python.file="C:\Python26\python.exe" "%1" %*
>
> C:\>ftype Python.NoConFile
> Python.NoConFile="C:\Python26\pythonw.exe" "%1" %*
>
> --
> Duncan Boothhttp://kupuguy.blogspot.com

Thanks for this (and all other) tips.
Strangely now my m/c shows things exactly like so. A new .py file gets
associated with python but two days ago it was with pythonw?!
Any recos on where I could read up on this stuff?


From rustompmody at gmail.com  Fri May 22 03:26:46 2009
From: rustompmody at gmail.com (rustom)
Date: Fri, 22 May 2009 00:26:46 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
Message-ID: <7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>

On May 22, 6:56?am, AggieDan04 <danb... at yahoo.com> wrote:
> The error in this example is roughly equivalent to the width of a red
> blood cell compared to the distance between Earth and the sun. ?There
> are very few applications that need more accuracy than that.

For a mathematician there are no inexact numbers; for a physicist no
exact ones.
Our education system is on the math side; reality it seems is on the
other.


From ldo at geek-central.gen.new_zealand  Fri May 22 03:28:03 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 22 May 2009 19:28:03 +1200
Subject: Cursor movement question
References: <3cmRl.90415$iW4.57403@en-nntp-01.dc1.easynews.com>
	<wxoRl.328387$Yx2.227908@en-nntp-06.dc1.easynews.com>
Message-ID: <gv5k63$t45$2@lust.ihug.co.nz>

In message <wxoRl.328387$Yx2.227908 at en-nntp-06.dc1.easynews.com>, Jive 
Dadson wrote:

> Gosh, you guys are slow. :-) I figured it out.

We were just waiting to see how long it would take you.



From gagsl-py2 at yahoo.com.ar  Fri May 22 03:35:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 22 May 2009 04:35:56 -0300
Subject: Error in code send Email
References: <8ca278430905202231w1b6a8cbsd50f88167b41251a@mail.gmail.com>
Message-ID: <op.uubl16ryx6zn5v@lepton.softlabbsas.com.ar>

En Thu, 21 May 2009 02:31:02 -0300, Kalyan Chakravarthy  
<kalyanchakravarthy at hyit.com> escribi?:

> I am using above  code to send an Email, for this i am not installed any
> SMTP setup my local , I just given import smtplib
> and I am getting following error
>
> **Traceback (most recent call last):
>   File "C:\Program
> Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py",
> line 500, in __call__
>     handler.post(*groups)
>   File "C:\Documents and Settings\desk\Desktop\apps\temp\main.py",
> line 129, in post
>     smtp_server = smtplib.SMTP( 'mail.%s' % mail.split( '@' )[-1] )
>   File "C:\Python26\lib\smtplib.py", line 239, in __init__
>     (code, msg) = self.connect(host, port)
>   File "C:\Python26\lib\smtplib.py", line 295, in connect
>     self.sock = self._get_socket(host, port, self.timeout)
>   File "C:\Python26\lib\smtplib.py", line 273, in _get_socket
>     return socket.create_connection((port, host), timeout)
> AttributeError: 'module' object has no attribute 'create_connection'

I think Google App Engine doesn't allow to use sockets directly.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May 22 03:42:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 22 May 2009 04:42:21 -0300
Subject: from __future__ import absolute_import issue
References: <1aeb486c-eef8-453c-8d04-fd831a84f8e2@g22g2000pra.googlegroups.com>
Message-ID: <op.uubmcvywx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 20 May 2009 20:18:02 -0300, LittleGrasshopper  
<seattlehanks at yahoo.com> escribi?:

> New to the group, this is my first post...
>
> It appears that either absolute imports (or my brain) aren't working.
> Given a module string.py which is in the same directory as a.py:
>
> #File a.py
> from __future__ import absolute_import
>
> import string
>
> print string # Module imported is string.py in current directory, not
> standard library module

absolute_import helps with imports inside a package (those are "relative"  
imports, relative to the package). If a module is located in a directory  
listed in sys.path, an absolute import will find it. I don't think there  
is a way to avoid shadowing a standard module (other than ensuring the  
standard directories come first in sys.path).

-- 
Gabriel Genellina



From mail at timgolden.me.uk  Fri May 22 03:54:59 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 22 May 2009 08:54:59 +0100
Subject: making a python program in windows
In-Reply-To: <7530b645-d6dc-483a-94ed-0dfbe9331ee2@d7g2000prl.googlegroups.com>
References: <mailman.488.1242897741.8015.python-list@python.org>
	<l-OdnQ3QTPFTt4jXnZ2dnUVZ8tJi4p2d@bt.com>	<c361a5d5-e63a-4117-8c55-21ae31245ff2@b6g2000pre.googlegroups.com>	<Xns9C1284B6480C9duncanbooth@127.0.0.1>
	<7530b645-d6dc-483a-94ed-0dfbe9331ee2@d7g2000prl.googlegroups.com>
Message-ID: <4A165A53.1010400@timgolden.me.uk>

rustom wrote:
> Thanks for this (and all other) tips.
> Strangely now my m/c shows things exactly like so. A new .py file gets
> associated with python but two days ago it was with pythonw?!
> Any recos on where I could read up on this stuff?

I by "all this stuff" you mean: Windows file associations,
then this would be the place:

  http://msdn.microsoft.com/en-us/library/dd758090(VS.85).aspx

If you mean: what the Python installer does to set such
things up, then there is some information here:

  http://docs.python.org/using/windows.html

but not really covering the exact question you've
been asking. You'd have to hunt around the archives
of this mailing list and/or look at the msi source:

  http://svn.python.org/view/python/trunk/Tools/msi/msi.py?view=markup

(and feel free to submit a doc patch if you think it might help)

TJG


From gagsl-py2 at yahoo.com.ar  Fri May 22 04:03:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 22 May 2009 05:03:56 -0300
Subject: Generating zipped or gzipped attachment with email package?
References: <20090521133409.A5F1E1084F58@montanaro.dyndns.org>
Message-ID: <op.uubncus9x6zn5v@lepton.softlabbsas.com.ar>

En Thu, 21 May 2009 10:34:09 -0300, <skip at pobox.com> escribi?:

> I want to modify my script to automatically zip or gzip files which  
> exceed
> some size threshold.  Doing the zip/gzip dance is no problem.  I'm  
> concerned
> about how to specify that properly with the email package.  For example,
> consider a large CSV file.  I figure out the MIME type is text/csv.  Now
> suppose I gzip the file before attaching it.  How would this code change  
> to
> specify the compression where "path" is now compressed?

HTTP uses the Content-Coding: gzip header field, but I think there is no  
equivalent in MIME :(
I'm afraid you'll have to declare the attachment as a gzipped file, and  
let the user manually unzip and handle the contained csv file.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May 22 04:34:08 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 22 May 2009 05:34:08 -0300
Subject: Question about locals()
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
	<49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>
Message-ID: <op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 19 May 2009 14:06:04 -0300, G?khan SEVER <gokhansever at gmail.com>  
escribi?:

> I will make double sure myself while using locals() to end up with valid
> identifiers.

I would ask myself why I'm using locals() in the first place.


-- 
Gabriel Genellina



From ldo at geek-central.gen.new_zealand  Fri May 22 04:43:10 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 22 May 2009 20:43:10 +1200
Subject: sqlite3, qmarks, and NULL values
References: <mailman.424.1242778866.8015.python-list@python.org>
Message-ID: <gv5oiu$vqb$1@lust.ihug.co.nz>

In message <mailman.424.1242778866.8015.python-list at python.org>, Mitchell L 
Model wrote:

> However, COL2 might be NULL. I can't figure out a value for y that would
> retrieve rows for which COL2 is NULL. It seems to me that I have to
> perform an awkward test to determine whether to execute a query with one
> question mark or two.

In SQL, NULL is supposed to be a special case, by design. Perhaps you 
shouldn't be using NULL in your data values here.



From kalyanchakravarthy at hyit.com  Fri May 22 04:50:21 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Fri, 22 May 2009 14:20:21 +0530
Subject: Error in code send Email
In-Reply-To: <op.uubl16ryx6zn5v@lepton.softlabbsas.com.ar>
References: <8ca278430905202231w1b6a8cbsd50f88167b41251a@mail.gmail.com>
	<op.uubl16ryx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <8ca278430905220150y2de115c3xe67e84f2b3ef6a65@mail.gmail.com>

*Google App Engine doesn't allow to use sockets directly *Then what could be
the solution for this ?

can any one Reply me


Regards
Kalyan

On Fri, May 22, 2009 at 1:05 PM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Thu, 21 May 2009 02:31:02 -0300, Kalyan Chakravarthy <
> kalyanchakravarthy at hyit.com> escribi?:
>
>  I am using above  code to send an Email, for this i am not installed any
>> SMTP setup my local , I just given import smtplib
>> and I am getting following error
>>
>> **Traceback (most recent call last):
>>  File "C:\Program
>> Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py",
>> line 500, in __call__
>>    handler.post(*groups)
>>  File "C:\Documents and Settings\desk\Desktop\apps\temp\main.py",
>> line 129, in post
>>    smtp_server = smtplib.SMTP( 'mail.%s' % mail.split( '@' )[-1] )
>>  File "C:\Python26\lib\smtplib.py", line 239, in __init__
>>    (code, msg) = self.connect(host, port)
>>  File "C:\Python26\lib\smtplib.py", line 295, in connect
>>    self.sock = self._get_socket(host, port, self.timeout)
>>  File "C:\Python26\lib\smtplib.py", line 273, in _get_socket
>>    return socket.create_connection((port, host), timeout)
>> AttributeError: 'module' object has no attribute 'create_connection'
>>
>
> *I think Google App Engine doesn't allow to use sockets directly.*
>
> --
> *Gabriel Genellina*
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Regards
Kalyan
Mobile no: +91 9985351220
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From redforks at gmail.com  Fri May 22 04:53:04 2009
From: redforks at gmail.com (Red Forks)
Date: Fri, 22 May 2009 16:53:04 +0800
Subject: defaultdict's bug or feature?
In-Reply-To: <op.uubdppr7a8ncjz@gnudebst>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
	<op.uua0bujla8ncjz@gnudebst>
	<3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
	<op.uubdppr7a8ncjz@gnudebst>
Message-ID: <3f18b3f10905220153u57016ddby3e31ada91630da0d@mail.gmail.com>

Yes, you maybe right. When use defaultdict, should not rely get() method
anymore, d[] is just enough. When a function return a defaultdict, but
people don't know it, so:

d = load_map()
# if she call d['a'], everything is OK but
# when call d.get('a'), she is always get None.
# Why she call d.get('a'), not d['a'], because she don't want to provider
default value herself (she didn't know it is a defaultdict)
It is just wield, call d[''a'] Ok, not get('a').

Sorry my poor english. Maybe somebody don't catch my mind, or maybe a little
rude.
I'm using and learning python about 2 weeks ago, spent me three hrs to find
the problem, almost drive me mad.
Maybe other like me, find some inconvience on this.

--------------------------------------------------------------------------------------

Actually, I steal defaultdict to do other things:

class OnloadDict(defaultdict):
    def __init__(self, onload):
        self.__onload = onload

    def __missing__(self, key):
        result = self.__onload(key)
        if not result:
            raise KeyError

        self[key] = result
        return result

    def get(self, key, default = None):
        ''' defaultdict.get() won't call __missing__, so override '''
        try:
            return self[key]
        except KeyError:
            return default

OnloadDict, is like a cache. When the value is not in dict, using 'onload'
function to load the value by the key.
When no value correspond to a key, a KeyError will raised. So I need a
*safer* version 'get()' method.

On Fri, May 22, 2009 at 12:35 PM, Rhodri James
<rhodri at wildebst.demon.co.uk>wrote:

> Please don't top-post, it makes the thread of argument hard to follow.
>
> On Fri, 22 May 2009 01:44:37 +0100, Red Forks <redforks at gmail.com> wrote:
>
>  You mean 'get' method should not alter the dict, does 'dict[key]' should
>> not
>> alter the dict either?
>>
>> d = defaultdict(set)
>> assert len(d) == 0
>> print d[1]
>> assert len(d) == 1
>>
>> auto insert value to dict, when value is not in dict, is what defaultdict
>> try to do.
>>
>
> Behaviour you are deliberately avoiding by calling `get`, since that
> explicitly behaves the same way that it does for dicts.  You're doing
> two different things through two different interfaces with two different
> specs.  Why are you expecting them to have the same effect?
>
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From joelc at cognyx.com  Fri May 22 05:17:50 2009
From: joelc at cognyx.com (Joel Ross)
Date: Fri, 22 May 2009 19:17:50 +1000
Subject: While Statement
Message-ID: <022660c5$0$21875$c3e8da3@news.astraweb.com>

Hi all,

I have this piece of code

class progess():

     def __init__(self, number,  char):

         total = number
         percentage = number
         while percentage > 0 :
             percentage = int(number/total*100)
             number-=1
             char+="*"
             print char

progess(999,  "*")

Just wondering if anyone has any ideas on way the percentage var gets 
set to the value 0 after the first loop.

Any feed back would be appreciated.

Regards

jross


From kushal.kumaran at gmail.com  Fri May 22 05:18:02 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Fri, 22 May 2009 14:48:02 +0530
Subject: Error in code send Email
In-Reply-To: <8ca278430905220150y2de115c3xe67e84f2b3ef6a65@mail.gmail.com>
References: <8ca278430905202231w1b6a8cbsd50f88167b41251a@mail.gmail.com> 
	<op.uubl16ryx6zn5v@lepton.softlabbsas.com.ar>
	<8ca278430905220150y2de115c3xe67e84f2b3ef6a65@mail.gmail.com>
Message-ID: <1e364c4e0905220218i7907a377n46c131a18eb414a1@mail.gmail.com>

On Fri, May 22, 2009 at 2:20 PM, Kalyan Chakravarthy
<kalyanchakravarthy at hyit.com> wrote:
> Google App Engine doesn't allow to use sockets directly Then what could be
> the solution for this ?
>
> can any one Reply me
>

Did you try google?

Searching for google app engine email immediately gives results.

See also: http://catb.org/esr/faqs/smart-questions.html

-- 
kushal


From davea at ieee.org  Fri May 22 05:26:25 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 22 May 2009 05:26:25 -0400
Subject: making a python program in windows
In-Reply-To: <vcdc15hqiokji7cgeck0rkn9i2g1hh5rmv@4ax.com>
References: <f46c52560905210222w983da1ci3b959f566a69a9e5@mail.gmail.com>	<mailman.518.1242932391.8015.python-list@python.org>
	<vcdc15hqiokji7cgeck0rkn9i2g1hh5rmv@4ax.com>
Message-ID: <4A166FC1.3070503@ieee.org>

Tim Roberts wrote:
> Dave Angel <davea at ieee.org> wrote:
>   
>> Anyway, now you can see two batch files you could use to make a 
>> particular version of Python active.  The first one uses assoc and ftype 
>> to fix the asssociations. And the other changes the environment variable 
>> PATHEXT to make the extension optional.  Note that changing the 
>> environment variable is effective only for that DOS box, and its 
>> children.  If you want a permanent change, you need to change the 
>> registry, probably at
>>   hklm\SYSTEM\ControlSet001\Contro/Session\Session 
>> Manager\Environment\PATHEXT
>>     
>
> The better way to do this is to bring up the System control panel applet
> (shortcut: WindowsKey + Pause/Break), Advanced, Environment Variables.  In
> the System variables, click PATHEXT and Edit, and add ;.PY;.PYW to the end.
>   

Certainly that's how I'd do it.  But the OP was averse to even using the 
OpenWith dialog to change the file associations.  He wanted a 
commandline/batch/script way of doing it.  So why would I give him the 
same kind of an answer for modifying environment vars?




From jeremy at martinfamily.freeserve.co.uk  Fri May 22 05:27:21 2009
From: jeremy at martinfamily.freeserve.co.uk (jeremy at martinfamily.freeserve.co.uk)
Date: Fri, 22 May 2009 02:27:21 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com> 
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com> 
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
	<16b51c17-b293-461e-8e87-efed1d35e5ba@o30g2000vbc.googlegroups.com>
	<mailman.555.1242965876.8015.python-list@python.org>
Message-ID: <f21b5b47-20ec-4d01-aecf-123b45facc8b@l28g2000vba.googlegroups.com>

On 22 May, 05:17, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> On Wed, 20 May 2009 09:19:50 +0100, <jer... at martinfamily.freeserve.co.uk> ?
> wrote:
>
> > On 20 May, 03:43, Steven D'Aprano
> > <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> >> On Tue, 19 May 2009 03:57:43 -0700, jeremy wrote:
> >> > As I wrote before, concurrency is one of the hardest things for
> >> > professional programmers to grasp. For 'amateur' programmers we need ?
> >> to
> >> > make it as simple as possible,
>
> Here, I think, is the fatal flaw in your plan. ?As Steven pointed out,
> concurrency isn't simple. ?All you are actually doing is making it
> easier for 'amateur' programmers to write hard-to-debug buggy code,
> since you seem to be trying to avoid making them think about how to
> write parallelisable code at all.
>
> > I *do* actually know a bit about concurrency and would never imply
> > that *any* for loop could be converted to a parallel one. The
> > intention of my remark "with my suggestion they could potentially get
> > a massive speed up just by changing 'for' to 'par' or 'map' to
> > 'pmap'." is that it could be applied in the particular circumstances
> > where there are no dependencies between different iterations of the
> > loop.
>
> If you can read this newsgroup for a week and still put your hand on
> your heart and say that programmers will check that there are no
> dependencies before swapping 'par' for 'for', I want to borrow your
> rose-coloured glasses. ?That's not to say this isn't the right solution,
> but you must be aware that people will screw this up very, very
> regularly, and making the syntax easy will only up the frequency of
> screw-ups.
>
> > This shows why the sync event is needed - to avoid ?race conditions on
> > shared variables. It is borrowed from the BSP paradigm - although that
> > is a distibuted memory approach. Without the sync clause, rule 5 would
> > just be the standard way of defining a parallelisable loop.
>
> Pardon my cynicism but sync would appear to have all the disadvantages
> of message passing (in terms of deadlock opportunities) with none of
> advantages (like, say, actual messages). ?The basic single sync you put
> forward may be coarse-grained enough to be deadlock-proof, but I would
> need to be more convinced of that than I am at the moment before I was
> happy.
>
>
>
> > P.S. I have a couple of additional embellishments to share at this
> > stage:
> [snip]
> > 2. Scope of the 'sync' command. It was pointed out to me by a
> > colleague that I need to define what happens with sync when there are
> > nested par loops. I think that it should be defined to apply to the
> > innermost par construct which encloses the statement.
>
> What I said before about deadlock-proofing? ?Forget it. ?There's hours
> of fun to be had once you introduce scoping, not to mention the fact
> that your inner loops can't now be protected against common code in the
> outer loop accessing the shared variables.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses

Hi Rhodri,

> If you can read this newsgroup for a week and still put your hand on
> your heart and say that programmers will check that there are no
> dependencies before swapping 'par' for 'for', I want to borrow your
> rose-coloured glasses.

I think this depends on whether we think that Python is a language for
people who we trust to know what they are doing (like Perl) or whether
it is a language for people we don't trust to get things right(like
Java). I suspect it probably lies somewhere in the middle.

Actually the 'sync' command could lead to deadlock potentially:

par i in range(2):
    if i == 1:
        sync

In this case there are two threads (or virtual threads): one thread
waits for a sync, the other does not, hence deadlock.

My view about deadlock avoidance is that it should not be built into
the language - that would make everything too restrictive - instead
people should use design patterns which guarantee freedom from
deadlock.

See http://www.wotug.org/docs/jeremy-martin/index.shtml

Jeremy


From tuomas.vesterinen at iki.fi  Fri May 22 05:32:40 2009
From: tuomas.vesterinen at iki.fi (Tuomas Vesterinen)
Date: Fri, 22 May 2009 12:32:40 +0300
Subject: Ambiguous locale.strxfrm
Message-ID: <4a167138$0$6271$9b536df3@news.fv.fi>

This was fixed once in Python 2.5, but in Python 3.0 the bug celebrates 
its comeback. The tail of the strxfrm result is ambiguous.

Python 3.0.1 (r301:69556, Apr 14 2009, 14:30:31)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import locale
 >>> locale.setlocale(locale.LC_COLLATE, 'en_US.utf8')
'en_US.utf8'
 >>> key1=locale.strxfrm('maupassant guy')
 >>>> for i in range(10):
...     print(locale.strxfrm('maupassant guy')==key1)
...
False
True
False
False
False
False
False
False
False
False

Tuomas Vesterinen


From kushal.kumaran at gmail.com  Fri May 22 05:33:12 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Fri, 22 May 2009 15:03:12 +0530
Subject: While Statement
In-Reply-To: <022660c5$0$21875$c3e8da3@news.astraweb.com>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
Message-ID: <1e364c4e0905220233n573cf007lb2f2c40c1163a2e6@mail.gmail.com>

On Fri, May 22, 2009 at 2:47 PM, Joel Ross <joelc at cognyx.com> wrote:
> Hi all,
>
> I have this piece of code
>
> class progess():
>
> ? ?def __init__(self, number, ?char):
>
> ? ? ? ?total = number
> ? ? ? ?percentage = number
> ? ? ? ?while percentage > 0 :
> ? ? ? ? ? ?percentage = int(number/total*100)
> ? ? ? ? ? ?number-=1
> ? ? ? ? ? ?char+="*"
> ? ? ? ? ? ?print char
>
> progess(999, ?"*")
>
> Just wondering if anyone has any ideas on way the percentage var gets set to
> the value 0 after the first loop.
>

Put in a

from __future__ import division

statement at the start.  You can experiment in the python shell if you'd like.

>>> 2/3
0
>>> from __future__ import division
>>> 2/3
0.66666666666666663
>>>

This kind of division is the default in Python 3.

-- 
kushal


From andreengels at gmail.com  Fri May 22 05:34:18 2009
From: andreengels at gmail.com (Andre Engels)
Date: Fri, 22 May 2009 11:34:18 +0200
Subject: While Statement
In-Reply-To: <022660c5$0$21875$c3e8da3@news.astraweb.com>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
Message-ID: <6faf39c90905220234y19568c87uafd036fed186f60f@mail.gmail.com>

On Fri, May 22, 2009 at 11:17 AM, Joel Ross <joelc at cognyx.com> wrote:
> Hi all,
>
> I have this piece of code
>
> class progess():
>
> ? ?def __init__(self, number, ?char):
>
> ? ? ? ?total = number
> ? ? ? ?percentage = number
> ? ? ? ?while percentage > 0 :
> ? ? ? ? ? ?percentage = int(number/total*100)
> ? ? ? ? ? ?number-=1
> ? ? ? ? ? ?char+="*"
> ? ? ? ? ? ?print char
>
> progess(999, ?"*")
>
> Just wondering if anyone has any ideas on way the percentage var gets set to
> the value 0 after the first loop.
>
> Any feed back would be appreciated.

In Python 2.6 and lower, division of two integers gives an integer,
being the result without rest of division with rest:

>>> 4/3
1
>>> 5/3
1
>>> 6/3
2
>>>

In your example, the second run has number = 998, total = 999. 998/999
is evaluated to be zero.

There are two ways to change this:
1. Ensure that at least one of the things you are using in the
division is a float. You could for example replace "total = number" by
"total = float(number)" or "number/total*100" by
"float(number)/total*100" or by "(number*100.0)/total".
2. Use Python 3 behaviour here, which is done by putting the import
"from __future__ import division" in your code.


-- 
Andr? Engels, andreengels at gmail.com


From joelc at cognyx.com  Fri May 22 06:00:16 2009
From: joelc at cognyx.com (Joel Ross)
Date: Fri, 22 May 2009 20:00:16 +1000
Subject: While Statement
In-Reply-To: <022660c5$0$21875$c3e8da3@news.astraweb.com>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
Message-ID: <0032524a$0$9715$c3e8da3@news.astraweb.com>

Joel Ross wrote:
> Hi all,
> 
> I have this piece of code
> 
> class progess():
> 
>     def __init__(self, number,  char):
> 
>         total = number
>         percentage = number
>         while percentage > 0 :
>             percentage = int(number/total*100)
>             number-=1
>             char+="*"
>             print char
> 
> progess(999,  "*")
> 
> Just wondering if anyone has any ideas on way the percentage var gets 
> set to the value 0 after the first loop.
> 
> Any feed back would be appreciated.
> 
> Regards
> 
> jross

Thanks for the quick response and the heads up. Makes sense

Thank you. You guys helped me out alot:)


From yashgt at gmail.com  Fri May 22 06:03:50 2009
From: yashgt at gmail.com (Yash Ganthe)
Date: Fri, 22 May 2009 03:03:50 -0700 (PDT)
Subject: Looking for module for shrinking a list with n-point means
Message-ID: <64997d17-9811-4fb1-a729-c80dd9fbcd9a@g22g2000pra.googlegroups.com>

Hi,

I would like to shrink a large list in the following way:
If the List has 1000 integers, we need only 100 averages such that the
1000 points are average for every 10 consecutive values. So p0 to p9
will be averaged to obtain t0. p10 to p19 will be averaged to obtain
t1 and so on. This is a 10-point mean.

We are doing this as we collect a lot of data and plot it on a graph.
Too many samples makes the graph cluttered. So we need to reduce the
number of values in the way described above.

Does SciPy or NumPy or any other module have functions for achieving
this?

Which function can be used for doing this?

Thanks,
Yash


From joelc at cognyx.com  Fri May 22 06:35:46 2009
From: joelc at cognyx.com (Joel Ross)
Date: Fri, 22 May 2009 20:35:46 +1000
Subject: While Statement
In-Reply-To: <mailman.571.1242984862.8015.python-list@python.org>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
	<mailman.571.1242984862.8015.python-list@python.org>
Message-ID: <00325a9c$0$9685$c3e8da3@news.astraweb.com>

Andre Engels wrote:
> On Fri, May 22, 2009 at 11:17 AM, Joel Ross <joelc at cognyx.com> wrote:
>> Hi all,
>>
>> I have this piece of code
>>
>> class progess():
>>
>>    def __init__(self, number,  char):
>>
>>        total = number
>>        percentage = number
>>        while percentage > 0 :
>>            percentage = int(number/total*100)
>>            number-=1
>>            char+="*"
>>            print char
>>
>> progess(999,  "*")
>>
>> Just wondering if anyone has any ideas on way the percentage var gets set to
>> the value 0 after the first loop.
>>
>> Any feed back would be appreciated.
> 
> In Python 2.6 and lower, division of two integers gives an integer,
> being the result without rest of division with rest:
> 
>>>> 4/3
> 1
>>>> 5/3
> 1
>>>> 6/3
> 2
> 
> In your example, the second run has number = 998, total = 999. 998/999
> is evaluated to be zero.
> 
> There are two ways to change this:
> 1. Ensure that at least one of the things you are using in the
> division is a float. You could for example replace "total = number" by
> "total = float(number)" or "number/total*100" by
> "float(number)/total*100" or by "(number*100.0)/total".
> 2. Use Python 3 behaviour here, which is done by putting the import
> "from __future__ import division" in your code.
> 
> 

Im using 2.6 python and when running this

class progess():

     def __init__(self, number, total,  char):

         percentage = float(number/total*100)
         percentage = int(round(percentage))
         char = char * percentage
         print char

progess(100, 999,  "*")

the "percentage = float(number/total*100)" always equals 0.0
any ideas way this would be?


From joel.goldstick at columbuswebmakers.com  Fri May 22 06:48:16 2009
From: joel.goldstick at columbuswebmakers.com (Joel Goldstick)
Date: Fri, 22 May 2009 06:48:16 -0400
Subject: Streaming pdf with URLLib
In-Reply-To: <gv4sq3$8gj$1@panix3.panix.com>
References: <04eacd56-5293-4553-bdb3-ad2e8266c6b0@z7g2000vbh.googlegroups.com>
	<gv4sq3$8gj$1@panix3.panix.com>
Message-ID: <4A1682F0.6050809@columbuswebmakers.com>

I think you misspelled 'Content-Disposition'

Aahz wrote:
> In article <04eacd56-5293-4553-bdb3-ad2e8266c6b0 at z7g2000vbh.googlegroups.com>,
> Scooter  <slbentley at gmail.com> wrote:
>> #!/usr/bin/python
>>
>> import urllib
>>
>> u = urllib.urlopen('https://myinternal.server/pdfs/pdfstreamer.aspx')
>> print 'Content-type: application/pdf\n\n'
>> # print 'Content-type: application/x-msdownload; name=\"FileName\"\n
>> \n'
>> # print 'Content-Dispostion: attachment; filename=\"FileName\"\r\n\n'
>>
>> pdfdoc = u.read()
>> print pdfdoc
>>
>> Hitting my pdfstreamer.aspx app directly through a browser renders a
>> pdf just fine. So now I'm attempting to use this python app on an
>> external webserver, access it as a cgi, to pull the pdf, and then re-
>> render it, but at that point it just shows me the raw pdf in
>> the browser.
> 
> What application type does the browser report?



From andreas.tawn at ubisoft.com  Fri May 22 06:51:03 2009
From: andreas.tawn at ubisoft.com (Andreas Tawn)
Date: Fri, 22 May 2009 12:51:03 +0200
Subject: While Statement
Message-ID: <8AEDA5E3386EA742B8C24C95FF0C758006F4F551@PDC-MAIL3.ubisoft.org>

> Im using 2.6 python and when running this

> 

> class progess():

> 

>      def __init__(self, number, total,  char):

> 

>          percentage = float(number/total*100)

>          percentage = int(round(percentage))

>          char = char * percentage

>          print char

> 

> progess(100, 999,  "*")

> 

> the "percentage = float(number/total*100)" always equals 0.0

 

Try percentage = float(number)/total*100 # The closing bracket position
is the important one

 

The problem is that you're converting to float after the int division
damage has been done.

 

Cheers,

 

Drea

 

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From sjmachin at lexicon.net  Fri May 22 07:00:19 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 22 May 2009 04:00:19 -0700 (PDT)
Subject: Looking for module for shrinking a list with n-point means
References: <64997d17-9811-4fb1-a729-c80dd9fbcd9a@g22g2000pra.googlegroups.com>
Message-ID: <e290b7ab-aebb-4d27-8edb-c50b72d21606@b34g2000pra.googlegroups.com>

On May 22, 8:03?pm, Yash Ganthe <yas... at gmail.com> wrote:
> Hi,
>
> I would like to shrink a large list in the following way:
> If the List has 1000 integers, we need only 100 averages such that the
> 1000 points are average for every 10 consecutive values. So p0 to p9
> will be averaged to obtain t0. p10 to p19 will be averaged to obtain
> t1 and so on. This is a 10-point mean.
>
> We are doing this as we collect a lot of data and plot it on a graph.
> Too many samples makes the graph cluttered. So we need to reduce the
> number of values in the way described above.
>
> Does SciPy or NumPy

What do their docs say?


> or any other module have functions for achieving
> this?
>
> Which function can be used for doing this?

Perhaps one like this:

| >>> def n_point_means(alist, n):
| ...     blist = alist[:]
| ...     blist.sort()
| ...     size = len(blist)
| ...     assert 1 <= n <= size
| ...     assert size % n == 0
| ...     clist = []
| ...     fn = float(n)
| ...     for i in xrange(0, size, n):
| ...         clist.append(sum(blist[i:i+n]) / fn)
| ...     return clist
| ...
| >>> aaa = [9,8,7,6,5,4,3,2,0]
| >>> n_point_means(aaa,2)
| Traceback (most recent call last):
|   File "<stdin>", line 1, in <module>
|   File "<stdin>", line 6, in n_point_means
| AssertionError
| >>> aaa = [9,8,7,6,5,4,3,2,1,0]
| >>> n_point_means(aaa,2)
| [0.5, 2.5, 4.5, 6.5, 8.5]
| >>> n_point_means(aaa,5)
| [2.0, 7.0]
| >>>

Does that do what you want? If your requirement is so simple, why not
write it yourself?



From andreengels at gmail.com  Fri May 22 07:19:06 2009
From: andreengels at gmail.com (Andre Engels)
Date: Fri, 22 May 2009 13:19:06 +0200
Subject: While Statement
In-Reply-To: <00325a9c$0$9685$c3e8da3@news.astraweb.com>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
	<mailman.571.1242984862.8015.python-list@python.org>
	<00325a9c$0$9685$c3e8da3@news.astraweb.com>
Message-ID: <6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>

On Fri, May 22, 2009 at 12:35 PM, Joel Ross <joelc at cognyx.com> wrote:

> Im using 2.6 python and when running this
>
> class progess():
>
> ? ?def __init__(self, number, total, ?char):
>
> ? ? ? ?percentage = float(number/total*100)
> ? ? ? ?percentage = int(round(percentage))
> ? ? ? ?char = char * percentage
> ? ? ? ?print char
>
> progess(100, 999, ?"*")
>
> the "percentage = float(number/total*100)" always equals 0.0
> any ideas way this would be?

You have to make the conversion of integer to float before the
division. What you are calculating now is (take number = 998, total =
999)

number/total = 998/999 = 0
number/total*100 = 0*100 = 0
float(number/total*100) = float(0) = 0.0

Change "float(number/total*100)" to "float(number)/total*100" and it
should work:

float(number) = float(998) = 998.0
float(number)/total = 998.0/999 = 0.99899899899899902
float(number)/total*100 = 0.99899899899899902 * 100 = 99.899899899899902



-- 
Andr? Engels, andreengels at gmail.com


From bvrkchowdary at yahoo.co.in  Fri May 22 07:26:49 2009
From: bvrkchowdary at yahoo.co.in (VenkataRamaKrishna Boddu)
Date: Fri, 22 May 2009 16:56:49 +0530 (IST)
Subject: Disabling Logging Handler for a Second
Message-ID: <839278.93751.qm@web8408.mail.in.yahoo.com>

Hi All,

Is there any way, I can disable one logging Handler, while other Log Handler are still available for servicing.....

Please see the below code. It explains my Problem better.
I actually reduce the size of problem, to make it understandable faster


------------------------------------------------------------------------------------------------------------------------------
import logging;
import sys;

thelog = logging.getLogger('app.scsi.cdb');
strmHdlr = logging.StreamHandler(sys.stdout);
fHdlr = logging.FileHandler('a.log')

thelog.addHandler(strmHdlr);
thelog.addHandler(fHdlr);
thelog.setLevel(logging.DEBUG);

thelog.info('Hello Python Logger');
thelog.info('This is Venkata Rama Krishna');

## Now, I want to disable the strmHdlr for some moment without
## actually removing the Handler from logger Object,
## I want to say something like
##
## thelog.disable('StreamHandler');
##
## So., that it disables all the Stream Handlers attached to the Logger Object

## The Need for me is that, I should write My Email Id only to File Stream
## and because of some reasons of moduler design, I don't have references to the
## both the Handlers

## Here, I don't have want to do the StreamHandler removing stuff and adding it again later on
thelog.removeHandler(strmHdlr);
thelog.info('Email: bvrkchowdary at yahoo.co.in');


## Now, I want to re-enable the strmHdlr without
## actually adding the Handler to the logger Object
## I want to say something like
##
## thelog.enable('StreamHandler');
##
## So., that it disables all the Stream Handlers attached to the Logger Object

## Now, I can write my Phone Number to both the Streams

## Here, I don't want to do the Stream Handler adding stuff 
thelog.addHandler(strmHdlr);
thelog.info('Phone no: +91-9985778581');
------------------------------------------------------------------------------------------------------------------------------

Thanking you,
Venkata Rama Krishna Boddu  


      Cricket on your mind? Visit the ultimate cricket website. Enter http://beta.cricket.yahoo.com
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From joelc at cognyx.com  Fri May 22 07:33:05 2009
From: joelc at cognyx.com (Joel Ross)
Date: Fri, 22 May 2009 21:33:05 +1000
Subject: While Statement
In-Reply-To: <mailman.575.1242991149.8015.python-list@python.org>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>	<mailman.571.1242984862.8015.python-list@python.org>	<00325a9c$0$9685$c3e8da3@news.astraweb.com>
	<mailman.575.1242991149.8015.python-list@python.org>
Message-ID: <0032680f$0$9718$c3e8da3@news.astraweb.com>

Andre Engels wrote:
> On Fri, May 22, 2009 at 12:35 PM, Joel Ross <joelc at cognyx.com> wrote:
> 
>> Im using 2.6 python and when running this
>>
>> class progess():
>>
>>    def __init__(self, number, total,  char):
>>
>>        percentage = float(number/total*100)
>>        percentage = int(round(percentage))
>>        char = char * percentage
>>        print char
>>
>> progess(100, 999,  "*")
>>
>> the "percentage = float(number/total*100)" always equals 0.0
>> any ideas way this would be?
> 
> You have to make the conversion of integer to float before the
> division. What you are calculating now is (take number = 998, total =
> 999)
> 
> number/total = 998/999 = 0
> number/total*100 = 0*100 = 0
> float(number/total*100) = float(0) = 0.0
> 
> Change "float(number/total*100)" to "float(number)/total*100" and it
> should work:
> 
> float(number) = float(998) = 998.0
> float(number)/total = 998.0/999 = 0.99899899899899902
> float(number)/total*100 = 0.99899899899899902 * 100 = 99.899899899899902
> 
> 
> 
changed it to "float(number)/total*100" and it worked thanks for all 
your help appreciated

thanks again


From tim.wintle at teamrubber.com  Fri May 22 08:19:36 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 22 May 2009 13:19:36 +0100
Subject: While Statement
In-Reply-To: <6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
	<mailman.571.1242984862.8015.python-list@python.org>
	<00325a9c$0$9685$c3e8da3@news.astraweb.com>
	<6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>
Message-ID: <1242994776.8046.137.camel@tim-laptop>

On Fri, 2009-05-22 at 13:19 +0200, Andre Engels wrote:
> number/total = 998/999 = 0
> number/total*100 = 0*100 = 0
> float(number/total*100) = float(0) = 0.0
> 
> Change "float(number/total*100)" to "float(number)/total*100" and it
> should work:

I'd use:

 (number * 100.)/total

- works because
 <int> * <float> => <float> 

It's a minor thing, but it's much faster to cast implicitly as you miss
the python function call overhead - it's no extra work to write, and for
numerical things it can really speed things up.

>>> a = timeit.Timer("float(200)/5*100")
>>> b = timeit.Timer("(200*100.)/5")
>>> a.timeit(10000000)
12.282480955123901
>>> b.timeit(10000000)
3.6434230804443359

Tim W




From bvidinli at gmail.com  Fri May 22 08:40:10 2009
From: bvidinli at gmail.com (bvidinli)
Date: Fri, 22 May 2009 15:40:10 +0300
Subject: General: tutorial to all new python users
Message-ID: <36e8a7020905220540j5d7bc8eal2213ce6bc04414a1@mail.gmail.com>

This is a good starting point i think:
http://pleac.sourceforge.net/pleac_python/index.html

(Also a non-related subject:   for who want to do hosting freely on
linux: www.ehcp.net (hosting control panel), also contains an
experimental python backend)


From fasteliteprogrammer at yahoo.com  Fri May 22 08:51:30 2009
From: fasteliteprogrammer at yahoo.com (Craig)
Date: Fri, 22 May 2009 05:51:30 -0700 (PDT)
Subject: python question
Message-ID: <577505.8394.qm@web36505.mail.mud.yahoo.com>


I use python 2.6.2 and i useing ubuntu 9.04 not windows.

--- On Thu, 5/21/09, Dave Angel <davea at ieee.org> wrote:

> From: Dave Angel <davea at ieee.org>
> Subject: Re: python question
> To: "Craig" <fasteliteprogrammer at yahoo.com>
> Cc: python-list at python.org
> Date: Thursday, May 21, 2009, 2:22 PM
> Craig wrote:
> > How do i install this.i never seen a python write in c
> before.
> > 
> > 
> >???
> Well, I've never seen a snake program in any language,
> python or otherwise.? And I believe python was named
> after Monty Python, not the snake.? But once it got its
> name, snake puns abound.
> 
> Anyway, why not tell you what you want to install, and on
> what platform?? If it's Python 2.6.2 on MS Windows XP,
> just download and run the msi file.
> ???On web page:???http://www.python.org/download/, you'd choose Python
> 2.6.2 Windows installer <http://www.python.org/ftp/python/2.6.2/python-2.6.2.msi>?
> and it'd give you file python-2.6.2.msi
> 
> 
> 
> 


      


From tim.wintle at teamrubber.com  Fri May 22 09:05:36 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 22 May 2009 14:05:36 +0100
Subject: python question
In-Reply-To: <577505.8394.qm@web36505.mail.mud.yahoo.com>
References: <577505.8394.qm@web36505.mail.mud.yahoo.com>
Message-ID: <1242997536.8046.146.camel@tim-laptop>

On Fri, 2009-05-22 at 05:51 -0700, Craig wrote:
> I use python 2.6.2 and i useing ubuntu 9.04 not windows.

What are you trying to install?

is it available in Synaptic package manager?


If it's a program written in python, then there may be a file called
"setup.py". If there is then open a terminal, cd to that directory, and
then type:

python setup.py install

(you may need to do "sudo" before it) - that will normally automatically
compile any extensions written in C

hope that helps.


Tim W



From codes47 at gmail.com  Fri May 22 09:11:31 2009
From: codes47 at gmail.com (ashish)
Date: Fri, 22 May 2009 06:11:31 -0700 (PDT)
Subject: General: tutorial to all new python users
References: <mailman.579.1242996093.8015.python-list@python.org>
Message-ID: <67e0468f-4379-4d4f-9be6-97421fb4f1e0@s1g2000prd.googlegroups.com>

On May 22, 5:40?am, bvidinli <bvidi... at gmail.com> wrote:
> This is a good starting point i think:http://pleac.sourceforge.net/pleac_python/index.html
>
> (Also a non-related subject: ? for who want to do hosting freely on
> linux:www.ehcp.net(hosting control panel), also contains an
> experimental python backend)



From python-url at phaseit.net  Fri May 22 09:13:32 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Fri, 22 May 2009 13:13:32 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (May 22)
Message-ID: <gv68ds$bng$1@lairds.us>



QOTW:  "Floating point is sort of like quantum physics: the closer you look,
the messier it gets." - Grant Edwards


    The circular relationship between object and type explained:
        http://comments.gmane.org/gmane.comp.python.general/623460
    
    Floating point numbers don't behave exactly like "normal", real numbers:
        http://groups.google.com/group/comp.lang.python/t/3c78637de989d352/
    
    Java vs. Python: Performance comparison
        http://groups.google.com/group/comp.lang.python/t/29ed8f4cd209f833/
    
    The 'in' operator calls __getitem__ in some cases:
        http://groups.google.com/group/comp.lang.python/t/e1841f61a7194673/

    The Planet Python RSS feed is now available for purchase through the
    Kindle platform!  Don't worry, any profits go to the Python Software
    Foundation.
    
    A new syntax proposal: adding support for parallel code execution:
        http://groups.google.com/group/comp.lang.python/t/fd41d1ed79067d04/
    
    Libraries that strictly implement the DOM are usually "unpythonic":
        http://groups.google.com/group/comp.lang.python/t/6b8d8fe1a6f4eab6/
    
    PEP 384: Defining a Stable ABI
        http://groups.google.com/group/comp.lang.python/t/bb75e3a77b9845a7/
    
    Sometimes it's useful to be able to "push back" an item into an iterator:
        http://groups.google.com/group/comp.lang.python/t/52f753e338b13390/
    
    ... but resetting an iterator isn't always feasible:
        http://groups.google.com/group/comp.lang.python/t/fc1dea1f72dbcd97/
    
    
========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiasts":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.
	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    Enjoy the *Python Magazine*.
	http://pymag.phparch.com/

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
  http://search.gmane.org/?query=python+URL+weekly+news+links&group=gmane.comp.python.general&sort=date
  http://groups.google.com/groups/search?q=Python-URL!+group%3Acomp.lang.python&start=0&scoring=d&
  http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes

There is *not* an RSS for "Python-URL!"--at least not yet.  Arguments
for and against are occasionally entertained.


Suggestions/corrections for next week's posting are always welcome.
E-mail to <Python-URL at phaseit.net> should get through.

To receive a new issue of this posting in e-mail each Monday morning
(approximately), ask <claird at phaseit.net> to subscribe.  Mention
"Python-URL!".  Write to the same address to unsubscribe.


-- The Python-URL! Team--

Phaseit, Inc. (http://phaseit.net) is pleased to participate in and
sponsor the "Python-URL!" project.  Watch this space for upcoming
news about posting archives.


From mabdelkader at gmail.com  Fri May 22 09:40:29 2009
From: mabdelkader at gmail.com (ma)
Date: Fri, 22 May 2009 09:40:29 -0400
Subject: How to get path.py ? http://www.jorendorff.com/ is down
In-Reply-To: <33e2534d-706f-4cad-8b35-fb9dc22b25ee@l12g2000yqo.googlegroups.com>
References: <mailman.521.1242935026.8015.python-list@python.org> 
	<33e2534d-706f-4cad-8b35-fb9dc22b25ee@l12g2000yqo.googlegroups.com>
Message-ID: <148918f0905220640s6248842cq30bd2f31462e096d@mail.gmail.com>

http://web.archive.org/web/20071105095205/www.jorendorff.com/articles/python/path/


On Thu, May 21, 2009 at 4:10 PM, Kay Schluehr <kay at fiber-space.de> wrote:

> On 21 Mai, 21:43, Jorge Vargas <jorge.var... at gmail.com> wrote:
> > Hello.
> >
> > Anyone knows what is the problem with this package? apparently the
> > author's site is down which prevents pip from installing it. I can
> > download the zip and go from there but It seems most of the docs are
> > gone with the site.
>
> The code comments shall be sufficient. It is a single not very complex
> module that basically  unifies several stdlib APIs as methods of a
> string subclass.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From jcd at sdf.lonestar.org  Fri May 22 09:46:33 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 22 May 2009 09:46:33 -0400
Subject: reseting an iterator
In-Reply-To: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
Message-ID: <1242999993.1294.18.camel@aalcdl07>

On Wed, 2009-05-20 at 11:35 -0700, Jan wrote:
> Wouldn't it be easy for Python to implement generating functions so
> that the iterators they return are equipped with a __reset__() method?
> 
> Here is the context of this question.
> 
> Python documentation defines  a "iterator" as an object ITERATOR
> having methods __next__() and __iter__() such that the call
> ITERATOR.__iter__() returns the object itself, and once a call
> ITERATOR. __next__() raises StopIteration every such subsequent call
> does the same.

You don't need a reset method.  There is no hard and fast rule that
__iter__ must return the object itself.  It just needs to return an
iterator.  For example:

>>> l = [1,2,3]
>>> l.__iter__()
<listiterator object at 0x7fd0da315850>
>>> l is l.__iter__()
False

Just create a class with an __iter__ method that returns a reset
iterator object.


class X(object):
    def __init__(self, max=3):
        self.counter = 0
        self.max = max
    def __iter__(self):
        return self
    def next(self):
        if self.counter < self.max:
            self.counter += 1
            return self.counter
        else:
            raise StopIteration

class Y(object):
    def __iter__(self):
        return X()

In this setup, X has the problem you are trying to avoid, but Y behaves
as a resettable iterable.

>>> x = X()
>>> for c in x:
...     print c
... 
1
2
3
>>> for c in x:
...     print c
... 
>>> y = Y()
>>> for c in y:
...     print c
... 
1
2
3
>>> for c in y:
...     if c < 3:
...         print c
... 
1
2
>>> for c in y:
...     print c
... 
1
2
3

Cheers,
Cliff




From Scott.Daniels at Acm.Org  Fri May 22 09:50:10 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 22 May 2009 06:50:10 -0700
Subject: Looking for module for shrinking a list with n-point means
In-Reply-To: <64997d17-9811-4fb1-a729-c80dd9fbcd9a@g22g2000pra.googlegroups.com>
References: <64997d17-9811-4fb1-a729-c80dd9fbcd9a@g22g2000pra.googlegroups.com>
Message-ID: <eP6dnSX_2dDcMYvXnZ2dnUVZ_v2dnZ2d@pdx.net>

Yash Ganthe wrote:
> I would like to shrink a large list in the following way:
> If the List has 1000 integers, we need only 100 averages such that the
> 1000 points are average for every 10 consecutive values. So p0 to p9
> will be averaged to obtain t0. p10 to p19 will be averaged to obtain
> t1 and so on. This is a 10-point mean.
> 
> We are doing this as we collect a lot of data and plot it on a graph.
> Too many samples makes the graph cluttered. So we need to reduce the
> number of values in the way described above.

Does this give you a clue?

     import numpy as np

     v = np.arange(128)
     v.shape = (16, 8)
     sum(v.transpose()) / 8.

--Scott David Daniels
Scott.Daniels at Acm.Org


From davea at ieee.org  Fri May 22 09:59:37 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 22 May 2009 09:59:37 -0400
Subject: While Statement
In-Reply-To: <1242994776.8046.137.camel@tim-laptop>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>	<mailman.571.1242984862.8015.python-list@python.org>	<00325a9c$0$9685$c3e8da3@news.astraweb.com>	<6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>
	<1242994776.8046.137.camel@tim-laptop>
Message-ID: <4A16AFC9.90302@ieee.org>



Tim Wintle wrote:
> On Fri, 2009-05-22 at 13:19 +0200, Andre Engels wrote:
>   
>> number/total = 998/999 = 0
>> number/total*100 = 0*100 = 0
>> float(number/total*100) = float(0) = 0.0
>>
>> Change "float(number/total*100)" to "float(number)/total*100" and it
>> should work:
>>     
>
> I'd use:
>
>  (number * 100.)/total
>
> - works because
>  <int> * <float> => <float> 
>
> It's a minor thing, but it's much faster to cast implicitly as you miss
> the python function call overhead - it's no extra work to write, and for
> numerical things it can really speed things up.
>
>   
>>>> a = timeit.Timer("float(200)/5*100")
>>>> b = timeit.Timer("(200*100.)/5")
>>>> a.timeit(10000000)
>>>>         
> 12.282480955123901
>   
>>>> b.timeit(10000000)
>>>>         
> 3.6434230804443359
>
> Tim W
>
>
>
>   
It's the old-timer in me, but I'd avoid the float entirely.  You start 
with ints, and you want to end with ints.  So simply do the multiply 
first, then the divide.

 number * 100/total

will get the same answer.



From joelc at cognyx.com  Fri May 22 10:03:15 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sat, 23 May 2009 00:03:15 +1000
Subject: While Statement
In-Reply-To: <mailman.584.1243000792.8015.python-list@python.org>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>	<mailman.571.1242984862.8015.python-list@python.org>	<00325a9c$0$9685$c3e8da3@news.astraweb.com>	<6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>	<1242994776.8046.137.camel@tim-laptop>
	<mailman.584.1243000792.8015.python-list@python.org>
Message-ID: <0226a3ab$0$25479$c3e8da3@news.astraweb.com>

Dave Angel wrote:
> 
> 
> Tim Wintle wrote:
>> On Fri, 2009-05-22 at 13:19 +0200, Andre Engels wrote:
>>  
>>> number/total = 998/999 = 0
>>> number/total*100 = 0*100 = 0
>>> float(number/total*100) = float(0) = 0.0
>>>
>>> Change "float(number/total*100)" to "float(number)/total*100" and it
>>> should work:
>>>     
>>
>> I'd use:
>>
>>  (number * 100.)/total
>>
>> - works because
>>  <int> * <float> => <float>
>> It's a minor thing, but it's much faster to cast implicitly as you miss
>> the python function call overhead - it's no extra work to write, and for
>> numerical things it can really speed things up.
>>
>>  
>>>>> a = timeit.Timer("float(200)/5*100")
>>>>> b = timeit.Timer("(200*100.)/5")
>>>>> a.timeit(10000000)
>>>>>         
>> 12.282480955123901
>>  
>>>>> b.timeit(10000000)
>>>>>         
>> 3.6434230804443359
>>
>> Tim W
>>
>>
>>
>>   
> It's the old-timer in me, but I'd avoid the float entirely.  You start 
> with ints, and you want to end with ints.  So simply do the multiply 
> first, then the divide.
> 
> number * 100/total
> 
> will get the same answer.
> 

Cheers thanks for the support. if it works faster I'll definitely do it


From gokhansever at gmail.com  Fri May 22 10:27:12 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Fri, 22 May 2009 09:27:12 -0500
Subject: Question about locals()
In-Reply-To: <op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
	<49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>
	<op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <49d6b3500905220727i265f3eb8q8482ded1d79c03f4@mail.gmail.com>

Hello,

I use local() because I read a file which has many consecutive variables in
it. Like shown below: (I use numpy's txt reading function)

serialc = np.loadtxt(sys.argv[1], skiprows=skiprows).T
for i in range(20):
    locals()['serialc_bin' + str(i+1)] = serialc[i+4]

I don't know easier way than using locals() to construct variable-like
identities in my program.

G?khan


On Fri, May 22, 2009 at 3:34 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Tue, 19 May 2009 14:06:04 -0300, G?khan SEVER <gokhansever at gmail.com>
> escribi?:
>
>  I will make double sure myself while using locals() to end up with valid
>> identifiers.
>>
>
> I would ask myself why I'm using locals() in the first place.
>
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at REMOVE-THIS-cybersource.com.au  Fri May 22 10:28:05 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 22 May 2009 14:28:05 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
	<4A15EB3E.2000006@mrabarnett.plus.com>
	<4A15EF9E.8070406@islandtraining.com> <gv4st8$11t$1@ger.gmane.org>
	<mailman.551.1242955822.8015.python-list@python.org>
Message-ID: <003290e1$0$9725$c3e8da3@news.astraweb.com>

On Thu, 21 May 2009 18:30:17 -0700, Gary Herron wrote:

>> In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
>> point algorithm for Python so that the shortest repr that will round
>> trip correctly is what is used as the floating point repr....
>>
>> --David
>>   
>>   
> Which won't change the fact that 0.8 and lots of other favorite floats
> are still not representable exactly, but it will hide this fact from
> most newbies.  One of the nicer results of this will be that these
> (almost) weekly questions and discussions will be come a thing of the
> past.
> 
> With a sigh of relief,

Yay! We now will have lots of subtle floating point bugs that people 
can't see! Ignorance is bliss and what you don't know about floating 
point can't hurt you!

>>> 0.8 - (0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1) == 0.0
False
>>> 0.8 - 0.5 - 0.2 - 0.1 == 0.0
False




-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May 22 10:28:12 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 22 May 2009 14:28:12 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
Message-ID: <003290e8$0$9725$c3e8da3@news.astraweb.com>

On Thu, 21 May 2009 18:56:08 -0700, AggieDan04 wrote:

> The error in this example is roughly equivalent to the width of a red
> blood cell compared to the distance between Earth and the sun.  There
> are very few applications that need more accuracy than that.

Which is fine if the error *remains* that small, but the problem is that 
errors usually increase and rarely cancel.


-- 
Steven


From tim.wintle at teamrubber.com  Fri May 22 10:29:59 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 22 May 2009 15:29:59 +0100
Subject: While Statement
In-Reply-To: <4A16AFC9.90302@ieee.org>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
	<mailman.571.1242984862.8015.python-list@python.org>
	<00325a9c$0$9685$c3e8da3@news.astraweb.com>
	<6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>
	<1242994776.8046.137.camel@tim-laptop>  <4A16AFC9.90302@ieee.org>
Message-ID: <1243002599.1085.6.camel@tim-laptop>

On Fri, 2009-05-22 at 09:59 -0400, Dave Angel wrote:
> 
> Tim Wintle wrote:
> > On Fri, 2009-05-22 at 13:19 +0200, Andre Engels wrote:

> >> Change "float(number/total*100)" to "float(number)/total*100" and it
> >> should work:
> >>     
> >
> > I'd use:
> >
> >  (number * 100.)/total
> >
> > - works because
> >  <int> * <float> => <float> 

> It's the old-timer in me, but I'd avoid the float entirely.  You start 
> with ints, and you want to end with ints.  So simply do the multiply 
> first, then the divide.
> 
>  number * 100/total

Agreed, to be honest I'd not fully read the original post and didn't
realise everything was an int.




> 
> will get the same answer.
> 



From gandalf at shopzeus.com  Fri May 22 10:32:59 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 22 May 2009 16:32:59 +0200
Subject: dbfpy - cannot store new record
In-Reply-To: <89b96c19c29ffa4439c1f4cb9a26efda@preisshare.net>
References: <4A153A10.1080906@shopzeus.com>	<mailman.510.1242921221.8015.python-list@python.org>
	<71b49836-d306-4399-9543-038ca69e9abb@v23g2000pro.googlegroups.com>
	<4A164769.5050802@shopzeus.com>
	<89b96c19c29ffa4439c1f4cb9a26efda@preisshare.net>
Message-ID: <4A16B79B.5090601@shopzeus.com>


> dbfpy is very old code.....
>
> Try setting up a CHAR(1) field and filling it with "Y" or "N" or
> "T" or "F".. indicating yes,no,true or false...
>   
Unfortunately, my task is to import records into a database that is used 
by an old foxpro program. I'm not allowed to change the database 
structure in any way.
> otherwise... just debug the dbfpy code...
>   
This is what I'll do. Thanks.

   Laszlo



From drobinow at gmail.com  Fri May 22 10:43:01 2009
From: drobinow at gmail.com (David Robinow)
Date: Fri, 22 May 2009 10:43:01 -0400
Subject: Question about locals()
In-Reply-To: <49d6b3500905220727i265f3eb8q8482ded1d79c03f4@mail.gmail.com>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
	<49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>
	<op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>
	<49d6b3500905220727i265f3eb8q8482ded1d79c03f4@mail.gmail.com>
Message-ID: <4eb0089f0905220743v6f4c5b67n4b43dd742b3bc1b9@mail.gmail.com>

On Fri, May 22, 2009 at 10:27 AM, G?khan SEVER <gokhansever at gmail.com> wrote:
...
> serialc = np.loadtxt(sys.argv[1], skiprows=skiprows).T
> for i in range(20):
> ??? locals()['serialc_bin' + str(i+1)] = serialc[i+4]
>
> I don't know easier way than using locals() to construct variable-like
> identities in my program.

I don't either.  I also don't know why you feel you need to construct
variable-like identities.
Why is:
  serialc_bin1
better than
  serialc_bin[0]
or, for that matter,
 serialc[4]

???


From walterbyrd at iname.com  Fri May 22 10:47:49 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Fri, 22 May 2009 07:47:49 -0700 (PDT)
Subject: When does the escape character work within raw strings?
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
Message-ID: <8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>

On May 21, 9:44?pm, "Rhodri James" <rho... at wildebst.demon.co.uk>
wrote:

> Escaping the delimiting quote is the *one* time backslashes have a
> special meaning in raw string literals.

If that were true, then wouldn't r'\b' be treated as two characters?

> This calls re.sub with a pattern string object that contains two
> characters, a backslash followed by an 'n'. ?This combination *does*
> have a special meaning to the sub function, which does it's own
> translation of the pattern into a single newline character. ?

So when do I know when a raw string is treated as a raw string, and
when it's not?


From gokhansever at gmail.com  Fri May 22 11:00:34 2009
From: gokhansever at gmail.com (=?UTF-8?Q?G=C3=B6khan_SEVER?=)
Date: Fri, 22 May 2009 10:00:34 -0500
Subject: Question about locals()
In-Reply-To: <4eb0089f0905220743v6f4c5b67n4b43dd742b3bc1b9@mail.gmail.com>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
	<49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>
	<op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>
	<49d6b3500905220727i265f3eb8q8482ded1d79c03f4@mail.gmail.com>
	<4eb0089f0905220743v6f4c5b67n4b43dd742b3bc1b9@mail.gmail.com>
Message-ID: <49d6b3500905220800r3fff1748h822315acb8effa29@mail.gmail.com>

Because in this case serialc is an numpy array. Since loadtxt returns a
numpy-array. Furthermore

locals()['serialc_bin' + str(i+1)]  creates a dictionary key (that's what I
use the term "variable-like") serialc_bin1, serialc_bin2, ... not
serialc_bin[0] with indexes.


G?khan


On Fri, May 22, 2009 at 9:43 AM, David Robinow <drobinow at gmail.com> wrote:

> On Fri, May 22, 2009 at 10:27 AM, G?khan SEVER <gokhansever at gmail.com>
> wrote:
> ...
> > serialc = np.loadtxt(sys.argv[1], skiprows=skiprows).T
> > for i in range(20):
> >     locals()['serialc_bin' + str(i+1)] = serialc[i+4]
> >
> > I don't know easier way than using locals() to construct variable-like
> > identities in my program.
>
> I don't either.  I also don't know why you feel you need to construct
> variable-like identities.
> Why is:
>  serialc_bin1
> better than
>  serialc_bin[0]
> or, for that matter,
>  serialc[4]
>
> ???
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From GDoermann at gmail.com  Fri May 22 11:00:57 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Fri, 22 May 2009 08:00:57 -0700 (PDT)
Subject: Python Socket Issues with VirtualBox
Message-ID: <45133930-0502-44fb-9d9b-83d22159e6f0@u9g2000pre.googlegroups.com>

I have created a server and client that communicate via a TCP socket
connection.  Everything runs great on 6 of the 6 boxes.  However, when
I installed Sun's VirtualBox on one of the PC's I started getting:
error: (10061, 'Connection refused')

I tried restarting, stopping services, checking out a new copy of the
code, changing ports, changing host names... all fails until I remove
VirtualBox.  I would REALLY like to be able to have both working.  Any
idea what might be causing this and how I could fix it?

Thanks,

Greg


From alan.franzoni.xyzz at gmail.com  Fri May 22 11:05:42 2009
From: alan.franzoni.xyzz at gmail.com (Alan Franzoni)
Date: Fri, 22 May 2009 15:05:42 GMT
Subject: Python Socket Issues with VirtualBox
References: <45133930-0502-44fb-9d9b-83d22159e6f0@u9g2000pre.googlegroups.com>
Message-ID: <1m9rekec3z2d3$.1j7hcy0d7aaei$.dlg@40tude.net>

TechieInsights was kind enough to say:

[cut]

You're giving very few details on your issue, which is most probably not
related to python itself. Which operating system? Which virtualbox version?
Which kind of connection? Is the port open for listen? Does the code fail
at listening or at connecting (e.g. is either the client or the server
failing) ?

My first guess would be that you didn't specify the interface to bind to,
and the interface order changes once you install virtualbox since it
possibly adds a virtual interface of its own, but I can't tell unless you
tell something more.

-- 
Alan Franzoni <alan.franzoni.xyzz at gmail.com>
-
Remove .xyzz from my email in order to contact me.
-
GPG Key Fingerprint:
5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E


From aahz at pythoncraft.com  Fri May 22 11:14:13 2009
From: aahz at pythoncraft.com (Aahz)
Date: 22 May 2009 08:14:13 -0700
Subject: python3 module for dbus ?
References: <4a1281ef$0$90271$14726298@news.sunsite.dk>
	<guuojl$l9g$1@panix3.panix.com>
	<4a15b88c$0$90265$14726298@news.sunsite.dk>
Message-ID: <gv6fg5$5og$1@panix3.panix.com>

In article <4a15b88c$0$90265$14726298 at news.sunsite.dk>,
Timothy Madden  <terminatorul at gmail.com> wrote:
>Aahz wrote:
>> In article <4a1281ef$0$90271$14726298 at news.sunsite.dk>,
>> Timothy Madden  <terminatorul at gmail.com> wrote:
>[...]
>>> Do you know if I can get dbus bindings for python3 and glib bindings for 
>>> python3 ? Or could I use them otherwise (like without the modules) ?
>> 
>> Sorry, no answers to your questions off-hand, but what's wrong with
>> using 2.x?
>
>It is now old and will be replaced by 3.0

That is only half-true -- Python 2.x will be a live project for at least
another couple of years and I bet that 3.x will not overtake 2.x for at
least three years (which is probably also the point at which no new
projects will be started in 2.x).  2.x is not "now old".

>And I am starting a new project. I think it would be appropriate to 
>start it with the new version of python.

Well, you're running right into one of the main reasons many people
advocate sticking with 2.x for now.  Unless you can come up with better
reasons for thinking that 2.x is wrong, I suggest you start your project
with 2.x; it should be easy to upgrade to 3.x when the library support is
available.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From jcd at sdf.lonestar.org  Fri May 22 11:21:06 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 22 May 2009 11:21:06 -0400
Subject: While Statement
In-Reply-To: <4A16AFC9.90302@ieee.org>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
	<mailman.571.1242984862.8015.python-list@python.org>
	<00325a9c$0$9685$c3e8da3@news.astraweb.com>
	<6faf39c90905220419y32cda5a6w8debd1c6172eb0d7@mail.gmail.com>
	<1242994776.8046.137.camel@tim-laptop>  <4A16AFC9.90302@ieee.org>
Message-ID: <1243005666.3385.13.camel@aalcdl07>

On Fri, 2009-05-22 at 09:59 -0400, Dave Angel wrote:
> 
> Tim Wintle wrote:
> > On Fri, 2009-05-22 at 13:19 +0200, Andre Engels wrote:
> >   
> >> number/total = 998/999 = 0
> >> number/total*100 = 0*100 = 0
> >> float(number/total*100) = float(0) = 0.0
> >>
> >> Change "float(number/total*100)" to "float(number)/total*100" and it
> >> should work:
> >>     
> >
> > I'd use:
> >
> >  (number * 100.)/total
> >
> > - works because
> >  <int> * <float> => <float> 
> >
> > It's a minor thing, but it's much faster to cast implicitly as you miss
> > the python function call overhead - it's no extra work to write, and for
> > numerical things it can really speed things up.
> >
> >   
> >>>> a = timeit.Timer("float(200)/5*100")
> >>>> b = timeit.Timer("(200*100.)/5")
> >>>> a.timeit(10000000)
> >>>>         
> > 12.282480955123901
> >   
> >>>> b.timeit(10000000)
> >>>>         
> > 3.6434230804443359
> >
> > Tim W
> >
> >
> >
> >   
> It's the old-timer in me, but I'd avoid the float entirely.  You start 
> with ints, and you want to end with ints.  So simply do the multiply 
> first, then the divide.
> 
>  number * 100/total
> 
> will get the same answer.
> 

Also, to get the same behavior (faster integer division) in python 3 or
when using `from __future__ import division`, use the // division
operator instead of /.

In fact, a little experimentation shows that you get the speedup even
when using python 2.6 with old-style division.  Probably because python
doesn't have to check the types of its arguments before deciding to do
integer division.

>>> a = timeit.Timer("(200 * 100.)/5")
>>> b = timeit.Timer("(200 * 100)/5")
>>> c = timeit.Timer("(200 * 100)//5")
>>> d = timeit.Timer("(200 * 100.0)//5")
>>> for each in a, b, c, d:
...     each.timeit(22222222)
... 
2.3681092262268066
2.417525053024292
0.81031703948974609
0.81548619270324707


Cheers,
Cliff






From steve at REMOVE-THIS-cybersource.com.au  Fri May 22 11:29:16 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 22 May 2009 15:29:16 GMT
Subject: When does the escape character work within raw strings?
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
Message-ID: <00329f36$0$9725$c3e8da3@news.astraweb.com>

On Fri, 22 May 2009 07:47:49 -0700, walterbyrd wrote:

> On May 21, 9:44?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> 
>> Escaping the delimiting quote is the *one* time backslashes have a
>> special meaning in raw string literals.
> 
> If that were true, then wouldn't r'\b' be treated as two characters?

It is.

>>> len(r'\b')
2



>> This calls re.sub with a pattern string object that contains two
>> characters, a backslash followed by an 'n'. ?This combination *does*
>> have a special meaning to the sub function, which does it's own
>> translation of the pattern into a single newline character.
> 
> So when do I know when a raw string is treated as a raw string, and when
> it's not?

You have misunderstood. All strings are strings, but there are different 
ways to build a string. Raw strings are not different from ordinary 
strings, they're just a different way to *build* an ordinary string.

Here are four ways to make the same string, a backslash followed by a 
lowercase b:

"\\b"        # use an ordinary string, and escape the backslash
chr(92)+"b"  # use the chr() function
"\x5cb"      # use a hex escape
r"\b"        # use a raw string, no escaping needed

The results you get from all of those (and many, many more!) are the same 
string object. They're just written differently as source code.

Now, in regular expressions, the RE engine expects to see special codes 
inside the string that have special meanings. For example, backslash 
followed by lowercase B has a special meaning. So to create a string 
containing that regex, you can use any of the above (or any of the 
others). The RE engine doesn't know, and can't know, how you generated 
the regex. All it sees is a string containing a backslash followed by 
lowercase-B.

But if you forget that Python uses backslash escapes in strings, and just 
write "\b", then the compiler creates the string chr(8) (BEL), which has 
no special meaning to the RE engine.


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May 22 11:34:09 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 22 May 2009 15:34:09 GMT
Subject: When does the escape character work within raw strings?
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
	<00329f36$0$9725$c3e8da3@news.astraweb.com>
Message-ID: <0032a05c$0$9725$c3e8da3@news.astraweb.com>

On Fri, 22 May 2009 15:29:16 +0000, Steven D'Aprano wrote:

> But if you forget that Python uses backslash escapes in strings, and
> just write "\b", then the compiler creates the string chr(8) (BEL),
> which has no special meaning to the RE engine.

Correction: \b is BACKSPACE, not BELL. \a is BELL.



-- 
Steven


From google at mrabarnett.plus.com  Fri May 22 11:43:35 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 22 May 2009 16:43:35 +0100
Subject: When does the escape character work within raw strings?
In-Reply-To: <00329f36$0$9725$c3e8da3@news.astraweb.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>	<mailman.459.1242842772.8015.python-list@python.org>	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>	<mailman.554.1242963859.8015.python-list@python.org>	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
	<00329f36$0$9725$c3e8da3@news.astraweb.com>
Message-ID: <4A16C827.7080900@mrabarnett.plus.com>

Steven D'Aprano wrote:
[snip]
> But if you forget that Python uses backslash escapes in strings, and just 
> write "\b", then the compiler creates the string chr(8) (BEL), which has 
> no special meaning to the RE engine.
> 
"\b" or chr(8) is BS (backspace); "\a" or chr(7) is BEL (bell).


From jcd at sdf.lonestar.org  Fri May 22 11:44:13 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 22 May 2009 11:44:13 -0400
Subject: Question about locals()
In-Reply-To: <49d6b3500905220800r3fff1748h822315acb8effa29@mail.gmail.com>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
	<49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>
	<op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>
	<49d6b3500905220727i265f3eb8q8482ded1d79c03f4@mail.gmail.com>
	<4eb0089f0905220743v6f4c5b67n4b43dd742b3bc1b9@mail.gmail.com>
	<49d6b3500905220800r3fff1748h822315acb8effa29@mail.gmail.com>
Message-ID: <1243007053.3385.32.camel@aalcdl07>

Top-posting corrected.

On Fri, 2009-05-22 at 10:00 -0500, G?khan SEVER wrote:

> On Fri, May 22, 2009 at 9:43 AM, David Robinow <drobinow at gmail.com>
> wrote:
>         On Fri, May 22, 2009 at 10:27 AM, G?khan SEVER
>         <gokhansever at gmail.com> wrote:
>         ...
>         > serialc = np.loadtxt(sys.argv[1], skiprows=skiprows).T
>         > for i in range(20):
>         >     locals()['serialc_bin' + str(i+1)] = serialc[i+4]
>         >
>         > I don't know easier way than using locals() to construct
>         variable-like
>         > identities in my program.
>         
>         
>         I don't either.  I also don't know why you feel you need to
>         construct
>         variable-like identities.
>         Why is:
>          serialc_bin1
>         better than
>          serialc_bin[0]
>         or, for that matter,
>          serialc[4]
>         
>         ???
>         
>         --
>         http://mail.python.org/mailman/listinfo/python-list
>         

> Because in this case serialc is an numpy array. Since loadtxt returns
> a numpy-array. Furthermore 
> 
> locals()['serialc_bin' + str(i+1)]  creates a dictionary key (that's
> what I use the term "variable-like") serialc_bin1, serialc_bin2, ...
> not serialc_bin[0] with indexes. 
> 
> 
> G?khan
> 
> 

I'm not sure why dictionary keys are better than indexes in your
example, especially as they're being created by coercing integers to
strings.  However, that's your business.  But why not just create your
own dictionary.  Then you can pass the results around easily as a group
or one at a time, and you don't have to mess in locals() (which isn't
supposed to be messed in).  It also gives you more flexibility as to how
you name your entries:

d = {}

You can use the same indexes you're using now:

d['serialc_bin' + str(i+1)] = serialc[i+4]

or you can keep the integerness of i by using tuples as keys (thus
preserving sort order across your keys):

d[('serialc_bin', i+1)] = serialc[i+4]

or you can use the integer as a key by itself (yes!  It looks like
you're accessing a list, but it's actually a dict with integer keys):

d[i+1] = serialc[i+4]

Or you can use a dict with a more descriptive name and the last above
solution gains the readability of your initial solution:

serialc_bin = {}
serialc_bin[i+1] = serialc[i+4]

Finally, if there's more you want to do with these numbers, you can
create a class to hold them.  Then as you need to, you can add methods
to it to implement the behavior you're looking for.

class MyCollection(object):
    """Untested code"""

    def __init__(self):
        self._store = {}

    def __getitem__(self, item):
        return self._store[item]

    def __setitem__(self, item, value):
        self._store[item] = value

    def __delitem__(self, item):
        del(self._store[item])

    def sum(self):
        total = 0
        for value in self._store.values():
            total += value
        return value

serialc_bin = MyCollection()
for i, value in enumerate(serialc):
    serialc_bin[i+1] = value
print serialc_bin.sum()

Any one of these seems like a better idea to me than trying to pollute
your local namespace with an unknown number of variables.  You have a
collection of objects.  It makes sense to store them in one of python's
collection types, or create an object of your own to store them.

Cheers,
Cliff




From drobinow at gmail.com  Fri May 22 11:52:48 2009
From: drobinow at gmail.com (David Robinow)
Date: Fri, 22 May 2009 11:52:48 -0400
Subject: Question about locals()
In-Reply-To: <49d6b3500905220800r3fff1748h822315acb8effa29@mail.gmail.com>
References: <49d6b3500905182135y2b982b30ob3ee2e5bd75e9d54@mail.gmail.com>
	<mailman.365.1242710834.8015.python-list@python.org>
	<pan.2009.05.19.06.06.24@REMOVE.THIS.cybersource.com.au>
	<49d6b3500905191006pd4f196fh76d3654ccbecf9e8@mail.gmail.com>
	<op.uuboq6rnx6zn5v@lepton.softlabbsas.com.ar>
	<49d6b3500905220727i265f3eb8q8482ded1d79c03f4@mail.gmail.com>
	<4eb0089f0905220743v6f4c5b67n4b43dd742b3bc1b9@mail.gmail.com>
	<49d6b3500905220800r3fff1748h822315acb8effa29@mail.gmail.com>
Message-ID: <4eb0089f0905220852l4c84fc5ckf38bc62b079b8836@mail.gmail.com>

On Fri, May 22, 2009 at 11:00 AM, G?khan SEVER <gokhansever at gmail.com> wrote:
> Because in this case serialc is an numpy array. Since loadtxt returns a
> numpy-array. Furthermore
>
> locals()['serialc_bin' + str(i+1)]? creates a dictionary key (that's what I
> use the term "variable-like") serialc_bin1, serialc_bin2, ... not
> serialc_bin[0] with indexes.

A name (or variable as you call it) is not a dictionary key. The
contents of the name may be.
A list can not be a dictionary key. However, a list element can be (or
not, if the element itself is mutable)
You gain nothing by creating all these names.


From paul at boddie.org.uk  Fri May 22 11:57:58 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Fri, 22 May 2009 08:57:58 -0700 (PDT)
Subject: Python Socket Issues with VirtualBox
References: <45133930-0502-44fb-9d9b-83d22159e6f0@u9g2000pre.googlegroups.com>
	<1m9rekec3z2d3$.1j7hcy0d7aaei$.dlg@40tude.net>
Message-ID: <d916e593-d165-4b44-88b0-7848f55f7ec7@y9g2000yqg.googlegroups.com>

On 22 Mai, 17:05, Alan Franzoni <alan.franzoni.x... at gmail.com> wrote:
>
> My first guess would be that you didn't specify the interface to bind to,
> and the interface order changes once you install virtualbox since it
> possibly adds a virtual interface of its own, but I can't tell unless you
> tell something more.

If a request is made to bind a socket to "" as is often indicated in
examples, I believe that an attempt is then made to bind the socket to
all available interfaces, and I can imagine that this might not work
for any special interfaces created for VirtualBox. See here for more
information:

http://docs.python.org/library/socket.html#example

Paul


From daniel.watrous at gmail.com  Fri May 22 12:19:29 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Fri, 22 May 2009 09:19:29 -0700 (PDT)
Subject: package questions
Message-ID: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>

Hello,

I've posted about this before, but after reading the docs, I have a
few more questions
here are the docs: http://docs.python.org/tutorial/modules.html#packages
here is my previous post:
http://groups.google.com/group/comp.lang.python/browse_thread/thread/3a352159f6828eb9/cda8395d36827d20

I've setup some directories for the sound package, exactly as shown in
the examples in the docs.  In the surround file I put the lines

from . import echo
from .. import formats
from ..filters import equalizer

again, exactly as in the docs.  When I run surround.py, I get the
following result:
C:\sound\effects>python surround.py
Traceback (most recent call last):
  File "surround.py", line 1, in <module>
    from . import echo
ValueError: Attempted relative import in non-package

C:\sound\effects>

Why doesn't this work as suggested in the docs.  The only way that I
found to get around this is to add directories to the path, but I
can't help but think that it shouldn't be necessary to modify the path
for packages to work.

Just to be sure, here are directory listings showing the I have the
__init__.py files in place

C:\sound\effects>dir
 Volume in drive C is Default
 Volume Serial Number is 8CD7-71F6

 Directory of C:\sound\effects

05/22/2009  10:07 AM    <DIR>          .
05/22/2009  10:07 AM    <DIR>          ..
05/22/2009  10:06 AM                 0 echo.py
05/22/2009  10:16 AM               189 surround.py
05/22/2009  10:04 AM                 0 __init__.py
               3 File(s)            189 bytes
               2 Dir(s)  50,860,060,672 bytes free

C:\POP\sound\effects>dir ..\
 Volume in drive C is Default
 Volume Serial Number is 8CD7-71F6

 Directory of C:\sound

05/22/2009  10:04 AM    <DIR>          .
05/22/2009  10:04 AM    <DIR>          ..
05/22/2009  10:07 AM    <DIR>          effects
05/22/2009  10:06 AM    <DIR>          filters
05/22/2009  10:04 AM    <DIR>          formats
05/22/2009  10:04 AM                 0 __init__.py
               1 File(s)              0 bytes
               5 Dir(s)  50,859,077,632 bytes free

C:\sound\effects>dir ..\filters
 Volume in drive C is Default
 Volume Serial Number is 8CD7-71F6

 Directory of C:\sound\filters

05/22/2009  10:06 AM    <DIR>          .
05/22/2009  10:06 AM    <DIR>          ..
05/22/2009  10:06 AM                 0 equalizer.py
05/22/2009  10:04 AM                 0 __init__.py
               2 File(s)              0 bytes
               2 Dir(s)  50,859,077,632 bytes free

Please share any feedback.  Thanks.


From alan.isaac at gmail.com  Fri May 22 12:38:40 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Fri, 22 May 2009 16:38:40 GMT
Subject: define "generator" (glossary bug?)
Message-ID: <kyARl.22$Cc1.9@nwrddc01.gnilink.net>

I believe the glossary
http://wiki.python.org/moin/PythonGlossary
is missing the definition for 'generator'
and has used instead the definition for 'generator function',
which term is missing from the glossary.

Standard usage as I understand it is found here:
http://docs.python.org/3.0/reference/simple_stmts.html#the-yield-statement

Cheers,
Alan Isaac


From exarkun at divmod.com  Fri May 22 13:07:57 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Fri, 22 May 2009 13:07:57 -0400
Subject: define "generator" (glossary bug?)
In-Reply-To: <kyARl.22$Cc1.9@nwrddc01.gnilink.net>
Message-ID: <20090522170757.21531.624524680.divmod.quotient.24523@henry.divmod.com>

On Fri, 22 May 2009 16:38:40 GMT, Alan G Isaac <alan.isaac at gmail.com> wrote:
>I believe the glossary
>http://wiki.python.org/moin/PythonGlossary
>is missing the definition for 'generator'
>and has used instead the definition for 'generator function',
>which term is missing from the glossary.
>
>Standard usage as I understand it is found here:
>http://docs.python.org/3.0/reference/simple_stmts.html#the-yield-statement
>

Well, it seems someone edited the wiki since you sent your message, since
there is no longer an entry for "generator function", but instead one for
"generator".

However, I think it was right before.  Consider:

def foo():
    yield

Now, is `foo? a generator?  If so, what is `foo()??

With the "generator function"/"generator" terminology, it is unambiguous
to say "`foo? is a generator function and `foo()? is a generator".

Jean-Paul


From aahz at pythoncraft.com  Fri May 22 13:26:41 2009
From: aahz at pythoncraft.com (Aahz)
Date: 22 May 2009 10:26:41 -0700
Subject: Cursor movement question
References: <3cmRl.90415$iW4.57403@en-nntp-01.dc1.easynews.com>
	<wxoRl.328387$Yx2.227908@en-nntp-06.dc1.easynews.com>
Message-ID: <gv6n8h$olu$1@panix3.panix.com>

In article <wxoRl.328387$Yx2.227908 at en-nntp-06.dc1.easynews.com>,
Jive Dadson  <notontheweb at noisp.com> wrote:
>
>Gosh, you guys are slow. :-) I figured it out.

Perhaps you could post the solution for posterity's sake?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"A foolish consistency is the hobgoblin of little minds, adored by little
statesmen and philosophers and divines."  --Ralph Waldo Emerson


From alan.isaac at gmail.com  Fri May 22 13:27:47 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Fri, 22 May 2009 17:27:47 GMT
Subject: define "generator" (glossary bug?)
In-Reply-To: <mailman.596.1243012080.8015.python-list@python.org>
References: <mailman.596.1243012080.8015.python-list@python.org>
Message-ID: <ngBRl.30$Cc1.16@nwrddc01.gnilink.net>

> On Fri, 22 May 2009 16:38:40 GMT, Alan G Isaac <alan.isaac at gmail.com> 
> wrote:
>> I believe the glossary
>> http://wiki.python.org/moin/PythonGlossary
>> is missing the definition for 'generator'
>> and has used instead the definition for 'generator function',
>> which term is missing from the glossary.
>>
>> Standard usage as I understand it is found here:
>> http://docs.python.org/3.0/reference/simple_stmts.html#the-yield-statement 


On 5/22/2009 1:07 PM Jean-Paul Calderone apparently wrote:
> Well, it seems someone edited the wiki since you sent your message, since
> there is no longer an entry for "generator function", but instead one for
> "generator".
> 
> However, I think it was right before. 


Nope, it is still the same, and that is the problem.
(My "which term" refered to 'generator function'.)

So you agree: it is a documentation bug in the glossary.

Alan Isaac


From Scott.Daniels at Acm.Org  Fri May 22 13:29:29 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 22 May 2009 10:29:29 -0700
Subject: package questions
In-Reply-To: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>
References: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>
Message-ID: <oqydnaGChug1QovXnZ2dnUVZ_qidnZ2d@pdx.net>

Daniel wrote:
> Hello,
> 
> I've posted about this before, but after reading the docs, I have a
> few more questions
> here are the docs: http://docs.python.org/tutorial/modules.html#packages
> here is my previous post:
> http://groups.google.com/group/comp.lang.python/browse_thread/thread/3a352159f6828eb9/cda8395d36827d20
> 
> I've setup some directories for the sound package, exactly as shown in
> the examples in the docs.  In the surround file I put the lines
> 
> from . import echo
> from .. import formats
> from ..filters import equalizer
> 
> again, exactly as in the docs.  When I run surround.py, I get the
> following result:
> C:\sound\effects>python surround.py
> Traceback (most recent call last):
>   File "surround.py", line 1, in <module>
>     from . import echo
> ...
(1) You really should identify your OS and Python version.  I am fairly
certain it is some form of Windows, but ....
Try something like:
     C:\sound\effects> cd C:\
     C:\> python -m sound.effects.surround

(2) you can run
     python -v surround.py
or
     python -vv surround.py
To see files opened (or attempted and opened for -vv) in order to
discover what exactly is tried and in what order on imports.
Warning: the output is huge.

--Scott David Daniels
Scott.Daniels at Acm.Org




From rhodri at wildebst.demon.co.uk  Fri May 22 13:34:34 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 18:34:34 +0100
Subject: Adding a Par construct to Python?
In-Reply-To: <f21b5b47-20ec-4d01-aecf-123b45facc8b@l28g2000vba.googlegroups.com>
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<1e6e1616-c888-43a3-a5b5-0739b8f77236@m24g2000vbp.googlegroups.com>
	<477992d9-271f-4c0c-a7f8-b0c98bdefe55@q14g2000vbn.googlegroups.com>
	<0221e31a$0$20621$c3e8da3@news.astraweb.com>
	<d6a9e74e-8d3d-4b95-883f-4bf5c6f51d7d@r3g2000vbp.googlegroups.com>
	<pan.2009.05.20.02.43.26@REMOVE.THIS.cybersource.com.au>
	<16b51c17-b293-461e-8e87-efed1d35e5ba@o30g2000vbc.googlegroups.com>
	<mailman.555.1242965876.8015.python-list@python.org>
	<f21b5b47-20ec-4d01-aecf-123b45facc8b@l28g2000vba.googlegroups.com>
Message-ID: <op.uucdrwyqa8ncjz@gnudebst>

On Fri, 22 May 2009 10:27:21 +0100, <jeremy at martinfamily.freeserve.co.uk>  
wrote:

> I think this depends on whether we think that Python is a language for
> people who we trust to know what they are doing (like Perl) or whether
> it is a language for people we don't trust to get things right(like
> Java). I suspect it probably lies somewhere in the middle.

So do I *in general*, but your design principle -- make it easy -- came
down firmly in the first camp and, as I said, I come down in the second
where parallel processing is concerned.  I've spent enough years weeding
bugs out of my insufficiently carefully designed Occam programs to have
the opinion that "easy" is the very last thing you want to make it.

> Actually the 'sync' command could lead to deadlock potentially:
>
> par i in range(2):
>     if i == 1:
>         sync

Hmm.  I was assuming you had some sort of implicit rendez-vous sync
at the end of the PAR.  Yes, this does make it very easy for the
freshly-enabled careless programmer to introduce deadlocks and
never realise it.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From skip at pobox.com  Fri May 22 13:44:30 2009
From: skip at pobox.com (skip at pobox.com)
Date: Fri, 22 May 2009 12:44:30 -0500
Subject: define "generator" (glossary bug?)
In-Reply-To: <ngBRl.30$Cc1.16@nwrddc01.gnilink.net>
References: <mailman.596.1243012080.8015.python-list@python.org>
	<ngBRl.30$Cc1.16@nwrddc01.gnilink.net>
Message-ID: <18966.58494.300882.479428@montanaro.dyndns.org>

    >>> I believe the glossary
    >>> http://wiki.python.org/moin/PythonGlossary
    >>> is missing the definition for 'generator'
    >>> and has used instead the definition for 'generator function',
    >>> which term is missing from the glossary.
    >>> 
    >>> Standard usage as I understand it is found here:
    >>> http://docs.python.org/3.0/reference/simple_stmts.html#the-yield-statement 

Note that the glossary page is on the wiki.  Feel free to make corrections.

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/
    America's vaunted "free press" notwithstanding, story ideas that expose
    the unseemly side of actual or potential advertisers tend to fall by the
    wayside.  Not quite sure why.  -- Jim Thornton


From jan.plaza at plattsburgh.edu  Fri May 22 13:54:59 2009
From: jan.plaza at plattsburgh.edu (Jan)
Date: Fri, 22 May 2009 10:54:59 -0700 (PDT)
Subject: reseting an iterator
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
	<mailman.583.1242999993.8015.python-list@python.org>
Message-ID: <bb616d71-b612-4b29-9da3-f5eda5acd834@z5g2000vba.googlegroups.com>

On May 22, 9:46?am, "J. Cliff Dyer" <j... at sdf.lonestar.org> wrote:

> You don't need a reset method. ?There is no hard and fast rule that
> __iter__ must return the object itself. ?It just needs to return an
> iterator. ?

I disagree.
If ITRATOR is a true iterator, ITRATOR.__iter__() must return
ITERATOR.
If ITERABLE is an iterable (but not necessarily an iterator)
ITRABLE.__iter__() must return an iterator.

> For example:
>
> >>> l = [1,2,3]
> >>> l.__iter__()
>
> <listiterator object at 0x7fd0da315850>>>> l is l.__iter__()
>
> False

[1,2,3] is an iterable but not an iterator, so this False result is
expected.
Compare this with the following.

>>> ii = iter([1,2,3])  # ii is an iterator.
>>> next(ii)
1
>>> jj = ii.__iter__() # call __iter__ method on an iterator
>>> ii is jj
True
>>> next(jj)
2

> Just create a class with an __iter__ method that returns a reset
> iterator object.
>
> class X(object):
> ? ? def __init__(self, max=3):
> ? ? ? ? self.counter = 0
> ? ? ? ? self.max = max
> ? ? def __iter__(self):
> ? ? ? ? return self
> ? ? def next(self):
> ? ? ? ? if self.counter < self.max:
> ? ? ? ? ? ? self.counter += 1
> ? ? ? ? ? ? return self.counter
> ? ? ? ? else:
> ? ? ? ? ? ? raise StopIteration
>
> class Y(object):
> ? ? def __iter__(self):
> ? ? ? ? return X()
>
> In this setup, X has the problem you are trying to avoid, but Y behaves
> as a resettable iterable.

> y = Y()

This does not work.

With this, y is not an interator, and not even an iterable.

> for c in y:

This produces an error because by definition of for-loops
it is executed the same way as:

temp_iterator = iter(y) # temp_iterator is y
while True:
    try:
        print(next(temp_iterator)) # temp_iterator does not support
__next__()
    except StopIteration:
        break

Jan


From rhodri at wildebst.demon.co.uk  Fri May 22 14:03:04 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 19:03:04 +0100
Subject: defaultdict's bug or feature?
In-Reply-To: <3f18b3f10905220153u57016ddby3e31ada91630da0d@mail.gmail.com>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
	<op.uua0bujla8ncjz@gnudebst>
	<3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
	<op.uubdppr7a8ncjz@gnudebst>
	<3f18b3f10905220153u57016ddby3e31ada91630da0d@mail.gmail.com>
Message-ID: <op.uuce3epla8ncjz@gnudebst>

I asked you not to top-post.  Please put your replies *below* the
messages you're quoting, not above.  It's much easier to understand
the conversation that we're having if you do that, and much more
aggravating if you don't.

On Fri, 22 May 2009 09:53:04 +0100, Red Forks <redforks at gmail.com> wrote:

> Yes, you maybe right. When use defaultdict, should not rely get() method
> anymore, d[] is just enough.

Almost.  You should rely on get() to do what it says, not what you think
it should do.  That's generally true, by the way; when the Fine Manual
says that a class, function or method will do one thing, expecting it to
do something else is unreasonable.

> Actually, I steal defaultdict to do other things:
>
> class OnloadDict(defaultdict):
>     def __init__(self, onload):
>         self.__onload = onload
>
>     def __missing__(self, key):
>         result = self.__onload(key)
>         if not result:
>             raise KeyError
>
>         self[key] = result
>         return result
>
>     def get(self, key, default = None):
>         ''' defaultdict.get() won't call __missing__, so override '''
>         try:
>             return self[key]
>         except KeyError:
>             return default
>
> OnloadDict, is like a cache. When the value is not in dict, using  
> 'onload'
> function to load the value by the key.
> When no value correspond to a key, a KeyError will raised. So I need a
> *safer* version 'get()' method.

Why are you so determined to (ab)use get() on your class?  You should
only be calling OnloadDict.get() if you really mean "get me the value
associated with this key, or the default I'm telling you about *right*
*now* if there isn't one."

Aside from that, this is neat.  Strictly you should call
defaultdict.__init__(self) in your __init__() function just in case
defaultdict needs any setup that you aren't doing (which it does, but
you override __missing__() so it never notices that it doesn't have
a default_factory).  You get away with it here, but it's not a good
habit to get into.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Fri May 22 14:22:49 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 19:22:49 +0100
Subject: When does the escape character work within raw strings?
In-Reply-To: <8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
Message-ID: <op.uucf0bara8ncjz@gnudebst>

On Fri, 22 May 2009 15:47:49 +0100, walterbyrd <walterbyrd at iname.com>  
wrote:

> On May 21, 9:44?pm, "Rhodri James" <rho... at wildebst.demon.co.uk>
> wrote:
>
>> Escaping the delimiting quote is the *one* time backslashes have a
>> special meaning in raw string literals.
>
> If that were true, then wouldn't r'\b' be treated as two characters?

It is.

>>> len(r'\b')
2

>> This calls re.sub with a pattern string object that contains two
>> characters, a backslash followed by an 'n'. ?This combination *does*
>> have a special meaning to the sub function, which does it's own
>> translation of the pattern into a single newline character. ?
>
> So when do I know when a raw string is treated as a raw string, and
> when it's not?

A raw string LITERAL is always treated as a raw string LITERAL when
the Python interpreter turns it into a string OBJECT.  I used the
capitalised words very deliberately and precisely, yet you seem to
have managed to conflate them again.  Please don't.  How the literal
is interpreted is up to the Python interpreter.  How the object is
interpreted is up to the thing doing the interpretation, in this
case the re.sub() function.

How do you know how a string object is going to be treated by any
given function?  Read the Fine Manual for that function.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From daniel.watrous at gmail.com  Fri May 22 14:29:24 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Fri, 22 May 2009 11:29:24 -0700 (PDT)
Subject: package questions
References: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>
	<oqydnaGChug1QovXnZ2dnUVZ_qidnZ2d@pdx.net>
Message-ID: <ca1c608f-1d62-468b-865c-b9ae7ce2ed37@s31g2000vbp.googlegroups.com>

On May 22, 11:29?am, Scott David Daniels <Scott.Dani... at Acm.Org>
wrote:
> Daniel wrote:
> > Hello,
>
> > I've posted about this before, but after reading the docs, I have a
> > few more questions
> > here are the docs:http://docs.python.org/tutorial/modules.html#packages
> > here is my previous post:
> >http://groups.google.com/group/comp.lang.python/browse_thread/thread/...
>
> > I've setup some directories for the sound package, exactly as shown in
> > the examples in the docs. ?In the surround file I put the lines
>
> > from . import echo
> > from .. import formats
> > from ..filters import equalizer
>
> > again, exactly as in the docs. ?When I run surround.py, I get the
> > following result:
> > C:\sound\effects>python surround.py
> > Traceback (most recent call last):
> > ? File "surround.py", line 1, in <module>
> > ? ? from . import echo
> > ...
>
> (1) You really should identify your OS and Python version. ?I am fairly
> certain it is some form of Windows, but ....
> Try something like:
> ? ? ?C:\sound\effects> cd C:\
> ? ? ?C:\> python -m sound.effects.surround
>
> (2) you can run
> ? ? ?python -v surround.py
> or
> ? ? ?python -vv surround.py
> To see files opened (or attempted and opened for -vv) in order to
> discover what exactly is tried and in what order on imports.
> Warning: the output is huge.
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

I'm on WinXP using Python 2.5  Sorry I didn't mention that at first.

C:\sound\effects>cd ..\..\

C:\>python -m sound.effects.surround
Traceback (most recent call last):
  File "C:\Python25\lib\runpy.py", line 95, in run_module
    filename, loader, alter_sys)
  File "C:\Python25\lib\runpy.py", line 52, in _run_module_code
    mod_name, mod_fname, mod_loader)
  File "C:\Python25\lib\runpy.py", line 32, in _run_code
    exec code in run_globals
  File "C:\POP\sound\effects\surround.py", line 5, in <module>
    from . import echo
ValueError: Attempted relative import in non-package

Do you want me to post the output from the -vv.  I couldn't see that
it actually tried to load it.  Here's a relevant portion (I think):
# C:\Python25\lib\linecache.pyc matches C:\Python25\lib\linecache.py
import linecache # precompiled from C:\Python25\lib\linecache.pyc
Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
Traceback (most recent call last):
  File "surround.py", line 1, in <module>
    from . import echo
ValueError: Attempted relative import in non-package
# clear __builtin__._

It appears to finish loading everything for python and then
immediately fails due to the import call.


From rhodri at wildebst.demon.co.uk  Fri May 22 14:38:30 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 22 May 2009 19:38:30 +0100
Subject: ffmpeg and python big problem
In-Reply-To: <819491b7-67b3-446e-b77e-9553b55da9d8@e21g2000yqb.googlegroups.com>
References: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>
	<mailman.546.1242952690.8015.python-list@python.org>
	<819491b7-67b3-446e-b77e-9553b55da9d8@e21g2000yqb.googlegroups.com>
Message-ID: <op.uucgqgsja8ncjz@gnudebst>

On Fri, 22 May 2009 13:54:26 +0100, TerabyteST <gabrycir at gmail.com> wrote:

> Could you give me a link to a version that "works"?

Not with any confidence.  The ffmpeg website (http://www.ffmpeg.org)
has a link to this page (http://ffmpeg.arrozcru.org/) which seems to
have binaries on it, but I don't use Windows so I have no idea if
they actually work or not.

> For putting the data in the stream I save bmp stills from the webcam
> and then use the write function giving the name of the file.

You don't believe in making life easy for yourself, do you? :-)
Why are you turning stills into a video anyway?  Wouldn't it be easier
to save the webcam output as video (whatever format it claims to be)
and get ffmpeg to work on it directly?

> @Emile: if I can access MEncoder from python and give it the images
> one by one, using a stream like i'm doing in ffmpeg, or telling it a
> sequence to make a video from, I could try it.

You seem to have emailed me directly, not the list.  I've copied this
back to the list so Emile can see it too.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From robert.kern at gmail.com  Fri May 22 15:06:44 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 22 May 2009 14:06:44 -0500
Subject: Looking for module for shrinking a list with n-point means
In-Reply-To: <eP6dnSX_2dDcMYvXnZ2dnUVZ_v2dnZ2d@pdx.net>
References: <64997d17-9811-4fb1-a729-c80dd9fbcd9a@g22g2000pra.googlegroups.com>
	<eP6dnSX_2dDcMYvXnZ2dnUVZ_v2dnZ2d@pdx.net>
Message-ID: <gv6t44$f04$1@ger.gmane.org>

On 2009-05-22 08:50, Scott David Daniels wrote:
> Yash Ganthe wrote:
>> I would like to shrink a large list in the following way:
>> If the List has 1000 integers, we need only 100 averages such that the
>> 1000 points are average for every 10 consecutive values. So p0 to p9
>> will be averaged to obtain t0. p10 to p19 will be averaged to obtain
>> t1 and so on. This is a 10-point mean.
>>
>> We are doing this as we collect a lot of data and plot it on a graph.
>> Too many samples makes the graph cluttered. So we need to reduce the
>> number of values in the way described above.
>
> Does this give you a clue?
>
> import numpy as np
>
> v = np.arange(128)
> v.shape = (16, 8)
> sum(v.transpose()) / 8.

Or even:

import numpy as np

v = np.arange(1000).reshape((-1, 10))
ten_point_mean = v.mean(axis=1)

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From atagar1 at gmail.com  Fri May 22 15:06:57 2009
From: atagar1 at gmail.com (Damian Johnson)
Date: Fri, 22 May 2009 12:06:57 -0700
Subject: Curses Subwin Resizing
Message-ID: <b89309180905221206m19ce6798uc48449b111c44999@mail.gmail.com>

Hi, I've been trying to make a curses application that's resilient to having
the terminal resized (like 'top'). I've managed to make it capable of
adjusting when the screen's width is changed (using getmaxyx) but changing
the height is proving a little trickier. I'm using subwindows so I can
selectively clear and redraw portions of the screen, however whenever the
screen's height is reduced it permanently shrinks (and moves) displaced
subwindows, so it can't recover when the screen's enlarged again. I've been
looking for hours for any of the following that would fix the problem...
... the ability to move and resize subwindows so I can restore them.
... the ability to delete subwindows so I can just receate them.
... the ability to selectively clear a rectangular region so I don't need
subwindows at all (I've spotted character deletion, but not region and it
seems kinda funky to tell curses to clear each cell individually).

This seems like it's probably a common problem but I haven't spotted a
solution. Any help would be appreciated! -Damian
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From dickinsm at gmail.com  Fri May 22 16:05:59 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Fri, 22 May 2009 13:05:59 -0700 (PDT)
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet> 
	<4A15EB3E.2000006@mrabarnett.plus.com>
	<4A15EF9E.8070406@islandtraining.com> <gv4st8$11t$1@ger.gmane.org>
	<mailman.551.1242955822.8015.python-list@python.org> 
	<003290e1$0$9725$c3e8da3@news.astraweb.com>
Message-ID: <b225774d-2db1-4171-afff-71e489494ae5@o14g2000vbo.googlegroups.com>

On May 22, 3:28?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Thu, 21 May 2009 18:30:17 -0700, Gary Herron wrote:
> >> In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
> >> point algorithm for Python so that the shortest repr that will round
> >> trip correctly is what is used as the floating point repr....
>
> >> --David
>
> > Which won't change the fact that 0.8 and lots of other favorite floats
> > are still not representable exactly, but it will hide this fact from
> > most newbies. ?One of the nicer results of this will be that these
> > (almost) weekly questions and discussions will be come a thing of the
> > past.
>
> > With a sigh of relief,
>
> Yay! We now will have lots of subtle floating point bugs that people
> can't see! Ignorance is bliss and what you don't know about floating
> point can't hurt you!

Why do you think this change will give rise to 'lots of subtle
floating point bugs'?  The new repr is still faithful, in the
sense that if x != y then repr(x) != repr(y).  Personally, I'm
not sure that the new repr is likely to do anything for
floating-point confusion either way.

What's gone in 3.1 is the capricious nature of the old "produce
17 significant digits and then remove all trailing zeros" rule
for repr.

For a specific example of the randomness of the current repr
rule, choose a random decimal in [0.5, 1.0) with at
most 12 places (say) after the decimal point;  for example, 0.567819.
Now type that number into Python at the interpreter prompt.
Then there's approximately a 9% chance (where the number 0.09 comes
from computing 2.**53/10.**17) that you'll see the number you
typed in (possibly with trailing zeros removed if you typed something
like 0.846100), and a 91% chance that you'll get the full 17
significant digits.

Try the same experiment for random decimals in the
interval [1.0, 2.0) and there's about a 45% chance you'll get
back what you typed in, and a 55% chance you'll get 17 sig. digs.

With the new repr, a float that can be specified with 15 significant
decimal digits or fewer will always use those digits for its repr.
It's not a panacea, but I don't see how it's worse than the old
repr.

Mark


From emile at fenx.com  Fri May 22 16:13:22 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 22 May 2009 13:13:22 -0700
Subject: ffmpeg and python big problem
In-Reply-To: <op.uucgqgsja8ncjz@gnudebst>
References: <65eaa1fc-c997-4f7c-8fcd-5c11f09c082d@o18g2000yqi.googlegroups.com>	<mailman.546.1242952690.8015.python-list@python.org>	<819491b7-67b3-446e-b77e-9553b55da9d8@e21g2000yqb.googlegroups.com>
	<op.uucgqgsja8ncjz@gnudebst>
Message-ID: <gv70th$sqk$1@ger.gmane.org>

On 5/22/2009 11:38 AM Rhodri James said...
> On Fri, 22 May 2009 13:54:26 +0100, TerabyteST <gabrycir at gmail.com> wrote:
<snip>
>> @Emile: if I can access MEncoder from python and give it the images
>> one by one, using a stream like i'm doing in ffmpeg, or telling it a
>> sequence to make a video from, I could try it.
> 

Here's the relevant code I'm using.  You can follow by mencoder's 
argument options what everything is, but essentially it expects that the 
images are collected in stillsdir, sub-titles are in srtfn, sub-title 
font in fontfn and then it creates the movie tmpfile, and if successful, 
renames it avifile.

HTH,

Emile

---------
cmdstr = '/usr/local/bin/mencoder mf://%s/*.jpg -mf 
type=jpg:w=640:h=480:fps=%d -fps %d -ofps %d -s
ub %s -font %s -vf pp=hb/vb -ovc lavc -lavcopts 
vcodec=msmpeg4v2:vbitrate=%d -oac copy -quiet -o "%s" && mv -f
  "%s" "%s"' % 
(stillsdir,FPS,FPS,FPS,srtfn,fontfn,vkbps,tmpfile,tmpfile,avifile)
print "generating movie %s from %s/" % (avifile,stillsdir)
print cmdstr
results = commands.getstatusoutput(cmdstr)
print results


> You seem to have emailed me directly, not the list.  I've copied this
> back to the list so Emile can see it too.

Thanks Rhodri -- Emile




From jcd at sdf.lonestar.org  Fri May 22 16:13:39 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Fri, 22 May 2009 16:13:39 -0400
Subject: reseting an iterator
In-Reply-To: <bb616d71-b612-4b29-9da3-f5eda5acd834@z5g2000vba.googlegroups.com>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
	<mailman.583.1242999993.8015.python-list@python.org>
	<bb616d71-b612-4b29-9da3-f5eda5acd834@z5g2000vba.googlegroups.com>
Message-ID: <1243023219.13323.2.camel@aalcdl07>

On Fri, 2009-05-22 at 10:54 -0700, Jan wrote: 
> On May 22, 9:46 am, "J. Cliff Dyer" <j... at sdf.lonestar.org> wrote:
> 
> > You don't need a reset method.  There is no hard and fast rule that
> > __iter__ must return the object itself.  It just needs to return an
> > iterator.  
> 
> I disagree.
> If ITRATOR is a true iterator, ITRATOR.__iter__() must return
> ITERATOR.
> If ITERABLE is an iterable (but not necessarily an iterator)
> ITRABLE.__iter__() must return an iterator.
> 

You are correct:  It is an iterable, not an iterator.  However, that's
not a disagreement with me.  It may not be an iterator (and I probably
should have said so) but it works, and it solves the OP's problem.
> > For example:
> >
> > >>> l = [1,2,3]
> > >>> l.__iter__()
> >
> > <listiterator object at 0x7fd0da315850>>>> l is l.__iter__()
> >
> > False
> 
> [1,2,3] is an iterable but not an iterator, so this False result is
> expected.
> Compare this with the following.
> 
> >>> ii = iter([1,2,3])  # ii is an iterator.
> >>> next(ii)
> 1
> >>> jj = ii.__iter__() # call __iter__ method on an iterator
> >>> ii is jj
> True
> >>> next(jj)
> 2
> 
> > Just create a class with an __iter__ method that returns a reset
> > iterator object.
> >
> > class X(object):
> >     def __init__(self, max=3):
> >         self.counter = 0
> >         self.max = max
> >     def __iter__(self):
> >         return self
> >     def next(self):
> >         if self.counter < self.max:
> >             self.counter += 1
> >             return self.counter
> >         else:
> >             raise StopIteration
> >
> > class Y(object):
> >     def __iter__(self):
> >         return X()
> >
> > In this setup, X has the problem you are trying to avoid, but Y behaves
> > as a resettable iterable.
> 
> > y = Y()
> 
> This does not work.
> 
> With this, y is not an interator, and not even an iterable.
> 
> > for c in y:
> 
> This produces an error because by definition of for-loops
> it is executed the same way as:
> 
> temp_iterator = iter(y) # temp_iterator is y
> while True:
>     try:
>         print(next(temp_iterator)) # temp_iterator does not support
> __next__()
>     except StopIteration:
>         break
> 

Did you try running my code?  I did.  It works on my computer.  What
error message did you get?

Cheers,
Cliff




From alan.isaac at gmail.com  Fri May 22 16:59:03 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Fri, 22 May 2009 20:59:03 GMT
Subject: define "generator" (glossary bug?)
In-Reply-To: <mailman.598.1243014276.8015.python-list@python.org>
References: <mailman.596.1243012080.8015.python-list@python.org>	<ngBRl.30$Cc1.16@nwrddc01.gnilink.net>
	<mailman.598.1243014276.8015.python-list@python.org>
Message-ID: <rmERl.94$Cc1.68@nwrddc01.gnilink.net>

On 5/22/2009 1:44 PM skip at pobox.com apparently wrote:
> Note that the glossary page is on the wiki.  Feel free to make corrections.

Well, ok, I've done so:
http://wiki.python.org/moin/PythonGlossary

But I'm just a user.  Someone should check it.

Thanks,
Alan Isaac



From Scott.Daniels at Acm.Org  Fri May 22 17:37:53 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 22 May 2009 14:37:53 -0700
Subject: package questions
In-Reply-To: <ca1c608f-1d62-468b-865c-b9ae7ce2ed37@s31g2000vbp.googlegroups.com>
References: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>
	<oqydnaGChug1QovXnZ2dnUVZ_qidnZ2d@pdx.net>
	<ca1c608f-1d62-468b-865c-b9ae7ce2ed37@s31g2000vbp.googlegroups.com>
Message-ID: <oMGdnYSGcM58hIrXnZ2dnUVZ_rCdnZ2d@pdx.net>

Daniel wrote:
> I'm on WinXP using Python 2.5  Sorry I didn't mention that at first.
Generally, you want the full version number (my 2.5 is 2.5.4).
However, I set up your demo setup, and found that 2.6.2 worked, and
2.5.4 failed in the same way you see.  I also see that even inside
the effects directory (with 2.6), I can use the syntax to work.
However, 2.5 is nearing "security fixes only" status, so I'd try
moving to 2.6. In the following, "C:\...\Py" is in my standard path.

     C:\...\Py\sound\effects> \python26\python -m sound.effects.surround
     effects package imported
     surround started
     echo imported
     echo in
     formats package imported
     formats in
     filters package imported
     equalizer imported
     filters in

But if I make a file:
     C:\...\Py\> type demo_sound.py
     import sound.effects.surround
     print('all loaded')
I can then:
     C:\...\Py> \python25\python demo_sound.py
     effects package imported
     surround started
     echo imported
     echo in
     formats package imported
     formats in
     filters package imported
     equalizer imported
     filters in
     all loaded
or even:
     C:\...\Py\sound\effects> \python25\python demo_sound.py
     effects package imported
     surround started
     echo imported
     echo in
     formats package imported
     formats in
     filters package imported
     equalizer imported
     filters in
     all loaded

So, not what you want to hear, but at least identified.  I expect
nobody wants to crawl into that code to make your case work,
especially since you can switch to 2.6 and have it work.  The
import code is said to be quite nasty and being rewritten/redocumented.


--Scott David Daniels
Scott.Daniels at Acm.Org


From news123 at free.fr  Fri May 22 17:47:32 2009
From: news123 at free.fr (News123)
Date: Fri, 22 May 2009 23:47:32 +0200
Subject: Your Favorite Python Book
In-Reply-To: <mailman.197.1242392785.8015.python-list@python.org>
References: <fe3354e50905111344k62e0e913g97eae4be5622dda5@mail.gmail.com>
	<mailman.197.1242392785.8015.python-list@python.org>
Message-ID: <4a171d74$0$22768$426a74cc@news.free.fr>

Evan Kroske wrote:
> Sam Tregar wrote:
>> Greetings. I'm working on learning Python and I'm looking for good
>> books to read. I'm almost done with Dive into Python and I liked it a
>> lot. I found Programming Python a little dry the last time I looked at
>> it, but I'm more motivated now so I might return to it. What's your
>> favorite? Why?
>>
>> -sam
>>
> Programming Python is good, but its examples follow a function-based
> . . .

I would *not* recommend 'Programming Python' (but perhaps this is just,
that I expected it to be the equivalent to 'Programming Perl' in the
Python world)

It is not good for getting started as it doesn't introduce the basics
well enough.

It is not good as a reference (it never intended to be one)

It touches many topics, but doesn't really go into too much depth.

It is really weak on Object Oriented programming

I personally prefered the Python Cookbook	

As I never read "Dive into Python" I don't know what books are good
complements.


N



From daniel.watrous at gmail.com  Fri May 22 18:10:41 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Fri, 22 May 2009 15:10:41 -0700 (PDT)
Subject: package questions
References: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>
	<oqydnaGChug1QovXnZ2dnUVZ_qidnZ2d@pdx.net>
	<ca1c608f-1d62-468b-865c-b9ae7ce2ed37@s31g2000vbp.googlegroups.com>
	<oMGdnYSGcM58hIrXnZ2dnUVZ_rCdnZ2d@pdx.net>
Message-ID: <1c10617e-c20f-4d2e-9c26-203aeccb36d0@y7g2000yqa.googlegroups.com>

On May 22, 3:37?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> Daniel wrote:
> > I'm on WinXP using Python 2.5 ?Sorry I didn't mention that at first.
>
> Generally, you want the full version number (my 2.5 is 2.5.4).
> However, I set up your demo setup, and found that 2.6.2 worked, and
> 2.5.4 failed in the same way you see. ?I also see that even inside
> the effects directory (with 2.6), I can use the syntax to work.
> However, 2.5 is nearing "security fixes only" status, so I'd try
> moving to 2.6. In the following, "C:\...\Py" is in my standard path.
>
> ? ? ?C:\...\Py\sound\effects> \python26\python -m sound.effects.surround
> ? ? ?effects package imported
> ? ? ?surround started
> ? ? ?echo imported
> ? ? ?echo in
> ? ? ?formats package imported
> ? ? ?formats in
> ? ? ?filters package imported
> ? ? ?equalizer imported
> ? ? ?filters in
>
> But if I make a file:
> ? ? ?C:\...\Py\> type demo_sound.py
> ? ? ?import sound.effects.surround
> ? ? ?print('all loaded')
> I can then:
> ? ? ?C:\...\Py> \python25\python demo_sound.py
> ? ? ?effects package imported
> ? ? ?surround started
> ? ? ?echo imported
> ? ? ?echo in
> ? ? ?formats package imported
> ? ? ?formats in
> ? ? ?filters package imported
> ? ? ?equalizer imported
> ? ? ?filters in
> ? ? ?all loaded
> or even:
> ? ? ?C:\...\Py\sound\effects> \python25\python demo_sound.py
> ? ? ?effects package imported
> ? ? ?surround started
> ? ? ?echo imported
> ? ? ?echo in
> ? ? ?formats package imported
> ? ? ?formats in
> ? ? ?filters package imported
> ? ? ?equalizer imported
> ? ? ?filters in
> ? ? ?all loaded
>
> So, not what you want to hear, but at least identified. ?I expect
> nobody wants to crawl into that code to make your case work,
> especially since you can switch to 2.6 and have it work. ?The
> import code is said to be quite nasty and being rewritten/redocumented.
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

Thanks for doing the experiment.  I'll begin to consider testing with
python 2.6 for a possible upgrade.

Daniel


From sjmachin at lexicon.net  Fri May 22 19:02:15 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 23 May 2009 09:02:15 +1000
Subject: dbfpy - cannot store new record
In-Reply-To: <4A16B79B.5090601@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com>	<mailman.510.1242921221.8015.python-list@python.org>
	<71b49836-d306-4399-9543-038ca69e9abb@v23g2000pro.googlegroups.com>
	<4A164769.5050802@shopzeus.com>
	<89b96c19c29ffa4439c1f4cb9a26efda@preisshare.net>
	<4A16B79B.5090601@shopzeus.com>
Message-ID: <4A172EF7.5010300@lexicon.net>

On 23/05/2009 12:32 AM, Laszlo Nagy wrote:
> 
>> dbfpy is very old code.....
>>
>> Try setting up a CHAR(1) field and filling it with "Y" or "N" or
>> "T" or "F".. indicating yes,no,true or false...
>>   
> Unfortunately, my task is to import records into a database that is used 
> by an old foxpro program. I'm not allowed to change the database 
> structure in any way.

It would have helped if you'd mentioned "foxpro" in your first message 
... [Q1] Is that really merely "Foxpro" or is it actually "Visual 
Foxpro" aka "VFP"? What version?

And some more questions:
[Q2] What (in hex, please) is in the first byte of the existing "old 
foxpro" DBF files that you need to update?
[Q3] Do you see the string "_NullFlags" in the first 1000 or so bytes of 
  those DBF files?
[Q4] What makes you sure that the "old foxpro program" can handle NULLs 
in L (logical) fields?
[Q5] How are NULLs represented in L (logical) fields in those files:
    (a) "?"
    (b) " "
    (c) weird stuff (see Q3)
    (d) something else
[Q6] Are there any FPT files in the same folder as the DBF files?
[Q7] Are there any CDX or MDX (or other ??X) files in the same folder as 
the DBF files?

>> otherwise... just debug the dbfpy code...
>>   
> This is what I'll do. Thanks.

Debugging something usually implies that the debugger knows what is 
expected behaviour :-)

In any case, what's to debug? The dbf code says rather plainly that it's 
set up for an (a) answer to Q5:
''' from fields.py line 311 onwards:
     def encodeValue(self, value):
         """Return a character from the "TF?" set.

         Return:
             Return value is "T" if ``value`` is True
             "?" if value is -1 or False otherwise.

         """
         if value is True:
             return "T"
         if value == -1:
             return "?"
         return "F"
'''

Cheers,
John


From sajmikins at gmail.com  Fri May 22 19:33:41 2009
From: sajmikins at gmail.com (Simon Forman)
Date: Fri, 22 May 2009 16:33:41 -0700 (PDT)
Subject: pushback iterator
References: <mailman.286.1242571201.8015.python-list@python.org>
Message-ID: <113b1286-a146-4ae5-8a17-2a24fe30212f@c9g2000yqm.googlegroups.com>

On May 17, 10:39?am, Matus <mat... at gmail.com> wrote:
> Hallo pylist,
>
> I searches web and python documentation for implementation of pushback
> iterator but found none in stdlib.
>
> problem:
> ========
> when you parse a file, often you have to read a line from parsed file
> before you can decide if you want that line it or not. if not, it would
> be a nice feature to be able po push the line back into the iterator, so
> nest time when you pull from iterator you get this 'unused' line.
>
> solution:
> =========
> I found a nice and fast solution somewhere on the net:
>
> ---------------------------------------------------------------------
> class Pushback_wrapper( object ):
> ? ? ? ? def __init__( self, it ):
> ? ? ? ? ? ? ? ? self.it = it
> ? ? ? ? ? ? ? ? self.pushed_back = [ ]
> ? ? ? ? ? ? ? ? self.nextfn = it.next
>
> ? ? ? ? def __iter__( self ):
> ? ? ? ? ? ? ? ? return self
>
> ? ? ? ? def __nonzero__( self ):
> ? ? ? ? ? ? ? ? if self.pushed_back:
> ? ? ? ? ? ? ? ? ? ? ? ? return True
>
> ? ? ? ? ? ? ? ? try:
> ? ? ? ? ? ? ? ? ? ? ? ? self.pushback( self.nextfn( ) )
> ? ? ? ? ? ? ? ? except StopIteration:
> ? ? ? ? ? ? ? ? ? ? ? ? return False
> ? ? ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? ? ? return True
>
> ? ? ? ? def popfn( self ):
> ? ? ? ? ? ? ? ? lst = self.pushed_back
> ? ? ? ? ? ? ? ? res = lst.pop( )
> ? ? ? ? ? ? ? ? if not lst:
> ? ? ? ? ? ? ? ? ? ? ? ? self.nextfn = self.it.next
> ? ? ? ? ? ? ? ? return res
>
> ? ? ? ? def next( self ):
> ? ? ? ? ? ? ? ? return self.nextfn( )
>
> ? ? ? ? def pushback( self, item ):
> ? ? ? ? ? ? ? ? self.pushed_back.append( item )
> ? ? ? ? ? ? ? ? self.nextfn = self.popfn
> ---------------------------------------------------------------------
>
> proposal:
> =========
> as this is (as I suppose) common problem, would it be possible to extend
> the stdlib of python (ie itertools module) with a similar solution so
> one do not have to reinvent the wheel every time pushback is needed?
>
> thx, Matus


By coincidence I had need of just such a pushback iterator just the
other day. I was playing with queues and generators after reading
David Beazley's "Generator Tricks For Systems Programmers" [1] and I
needed an iterator that could be used with this generator function:

def pushQueueNonblocking(queue, iterator):
    for item in iterator:
        try:
            queue.put(item, False)
        except Queue.Full:
            raise Queue.Full(item)

If the queue is full I pass item taken from the iterator but not yet
pushed onto the queue up to the caller in the Full exception so it
doesn't get lost. I wrote a wrapper function that retried putting
items on the queue after sleeping for a certain time if the queue is
full.

def pushQueueRetry(queue, iterator, retry_delay=1):
    iterator = IteratorWithPushback(iterator)
    while True:
        try:
            pushQueueNonblocking(queue, iterator)
        except Queue.Full, err:
            iterator.pushback(err.args[0])
            if retry_delay >= 0:
                sleep(retry_delay)
        else:
            break

Originally I used an itertools.chain() solution, but when I tried the
function with sleep of 0 (the queue was being get() from once a second
in another thread) I hit a funny error.

Because the put() thread was running, and retrying, much faster than
the get() thread, a huge "linked list" of itertools.chain generator
objects was stored up in memory.  When the get() thread finally
unblocked the queue and the call to put() succeeded, the
pushQueueNonblocking() would loop and call next() on the chain object,
which would call next() on the next chain object, which called next()
on the next next chain object, etc...

That linked list of chain iterators was longer than
sys.getrecursionlimit().

Anyway, FWIW here's the IteratorWithPushback class that I whanged up:


class IteratorWithPushback:

    def __init__(self, initial_iterator):
        self.iter = iter(initial_iterator)
        self.last = None
        self.has_last = False

    def __iter__(self):
        return self

    def next(self):
        if self.has_last:
            item = self.last
            self.has_last = False
            self.last = None # Don't hang on to it.
        else:
            item = self.iter.next()
        return item

    def pushback(self, item):
        if self.has_last:
            raise Exception("I'm full!")
        self.last = item
        self.has_last = True

As for putting something like this in the standard library, I'm not
sure. I've never needed one before and it's easy enough to write.
*shrug*


Regards,
~Simon

[1] http://www.dabeaz.com/generators/Generators.pdf


From Scott.Daniels at Acm.Org  Fri May 22 19:46:19 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 22 May 2009 16:46:19 -0700
Subject: package questions
In-Reply-To: <1c10617e-c20f-4d2e-9c26-203aeccb36d0@y7g2000yqa.googlegroups.com>
References: <0c3c26a3-f608-479d-939f-dd30e8f9b400@z5g2000yqn.googlegroups.com>
	<oqydnaGChug1QovXnZ2dnUVZ_qidnZ2d@pdx.net>
	<ca1c608f-1d62-468b-865c-b9ae7ce2ed37@s31g2000vbp.googlegroups.com>
	<oMGdnYSGcM58hIrXnZ2dnUVZ_rCdnZ2d@pdx.net>
	<1c10617e-c20f-4d2e-9c26-203aeccb36d0@y7g2000yqa.googlegroups.com>
Message-ID: <a6OdnVLnwK9kqorXnZ2dnUVZ_hWdnZ2d@pdx.net>

Daniel wrote:
> Thanks for doing the experiment.  I'll begin to consider testing with
> python 2.6 for a possible upgrade.

I hope you know you can have different minor versions installed
simultaneously.

--Scott David Daniels
Scott.Daniels at Acm.Org



From redforks at gmail.com  Fri May 22 20:30:50 2009
From: redforks at gmail.com (Red Forks)
Date: Sat, 23 May 2009 08:30:50 +0800
Subject: defaultdict's bug or feature?
In-Reply-To: <op.uuce3epla8ncjz@gnudebst>
References: <3f18b3f10905210507g3f796df9pc3713cfeace3178b@mail.gmail.com>
	<op.uua0bujla8ncjz@gnudebst>
	<3f18b3f10905211744w19af3dbdoe02e610e19d82cb3@mail.gmail.com>
	<op.uubdppr7a8ncjz@gnudebst>
	<3f18b3f10905220153u57016ddby3e31ada91630da0d@mail.gmail.com>
	<op.uuce3epla8ncjz@gnudebst>
Message-ID: <3f18b3f10905221730s155ba0c8i4fb6ecd935ecb9a5@mail.gmail.com>

On Sat, May 23, 2009 at 2:03 AM, Rhodri James
<rhodri at wildebst.demon.co.uk>wrote:

> I asked you not to top-post.  Please put your replies *below* the
> messages you're quoting, not above.  It's much easier to understand
> the conversation that we're having if you do that, and much more
> aggravating if you don't.
>
I misunderstand you last email, thanks.

>
> On Fri, 22 May 2009 09:53:04 +0100, Red Forks <redforks at gmail.com> wrote:
>
>  Yes, you maybe right. When use defaultdict, should not rely get() method
>> anymore, d[] is just enough.
>>
>
> Almost.  You should rely on get() to do what it says, not what you think
> it should do.  That's generally true, by the way; when the Fine Manual
> says that a class, function or method will do one thing, expecting it to
> do something else is unreasonable.
>
>  Actually, I steal defaultdict to do other things:
>>
>> class OnloadDict(defaultdict):
>>    def __init__(self, onload):
>>        self.__onload = onload
>>
>>    def __missing__(self, key):
>>        result = self.__onload(key)
>>        if not result:
>>            raise KeyError
>>
>>        self[key] = result
>>        return result
>>
>>    def get(self, key, default = None):
>>        ''' defaultdict.get() won't call __missing__, so override '''
>>        try:
>>            return self[key]
>>        except KeyError:
>>            return default
>>
>> OnloadDict, is like a cache. When the value is not in dict, using 'onload'
>> function to load the value by the key.
>> When no value correspond to a key, a KeyError will raised. So I need a
>> *safer* version 'get()' method.
>>
>
> Why are you so determined to (ab)use get() on your class?  You should
> only be calling OnloadDict.get() if you really mean "get me the value
> associated with this key, or the default I'm telling you about *right*
> *now* if there isn't one."

The key point is: "what key/value pairs should in defaultdict". I think any
key/default pair(they'll add to dict when you ask for it), maybe you think
only manual added pairs.
defaultdict break dict rules, that a query method (d[key]) should not modify
dict, so another query method (the get() method) break default rule is not a
big deal.
Never mind, my "get()" method hack works OK.

>
>
> Aside from that, this is neat.  Strictly you should call
> defaultdict.__init__(self) in your __init__() function just in case
> defaultdict needs any setup that you aren't doing (which it does, but
> you override __missing__() so it never notices that it doesn't have
> a default_factory).  You get away with it here, but it's not a good
> habit to get into.
>
I'm new to python, adding  'defaultdict.__init__()' call would be nice. In
other languages, base class's default constructor is automaticlly called.

>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From jcd at sdf.lonestar.org  Fri May 22 20:31:22 2009
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Sat, 23 May 2009 00:31:22 +0000
Subject: reseting an iterator
In-Reply-To: <bb616d71-b612-4b29-9da3-f5eda5acd834@z5g2000vba.googlegroups.com>
References: <e94f94cf-849a-404d-aaf0-a3db9f7cbb2d@x6g2000vbg.googlegroups.com>
	<mailman.583.1242999993.8015.python-list@python.org>
	<bb616d71-b612-4b29-9da3-f5eda5acd834@z5g2000vba.googlegroups.com>
Message-ID: <1243038682.1793.2.camel@mctell>

On Fri, 2009-05-22 at 10:54 -0700, Jan wrote:
> This produces an error because by definition of for-loops
> it is executed the same way as:
> 
> temp_iterator = iter(y) # temp_iterator is y
> while True:
>     try:
>         print(next(temp_iterator)) # temp_iterator does not support
> __next__()
>     except StopIteration:
>         break
> 

I think this is where you missed my point.

iter(y) actually returns an instance of class X, which does support
iteration.  And it returns a new X each time, thus resetting the
iterator.

That exact setup might or might not support your use case.  I don't
know, because you haven't described it.  However, whatever you need done
to X to get it back in shape to reiterate over can be done in
Y.__iter__().

Honestly, do you care if it's an iterator or an iterable, so long as
python can handle the job?






From mypromise at sina.com  Fri May 22 20:58:14 2009
From: mypromise at sina.com (zhouhaifeng)
Date: Sat, 23 May 2009 08:58:14 +0800
Subject: SendMessage question
Message-ID: <4A174A26.20209@sina.com>

Hi,I want to send "ctrl + A" and "ctrl + C" to a window,
but my code can not work, who can help me ?

Thanks a lot!

hWnd = win32gui.FindWindow(None, "?pad")
print hWnd
if hWnd <> 0:
point = (555, 175)
x, y = point
win32api.SetCursorPos(point)

win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
win32api.SetCursorPos(point)
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)

#ctrl + A
win32api.SendMessage(hWnd, 0, win32con.VK_CONTROL, 0)
win32api.Sleep(10)
win32api.SendMessage(hWnd, 0, 65, 0)
win32api.SendMessage(hWnd, win32con.KEYEVENTF_KEYUP, 65, 0)
win32api.SendMessage(hWnd, win32con.KEYEVENTF_KEYUP, win32con.VK_CONTROL, 0)
win32api.Sleep(10)

#ctrl + C
win32api.SendMessage(hWnd, win32con.WM_KEYDOWN, win32con.VK_CONTROL, 0)
win32api.Sleep(10)
win32api.SendMessage(hWnd, win32con.WM_KEYDOWN, 67, 0)
win32api.SendMessage(hWnd, win32con.WM_KEYUP, 67, 0)
win32api.SendMessage(hWnd, win32con.WM_KEYUP, win32con.VK_CONTROL, 0)
win32api.Sleep(10)


From dan.shumaker at comcast.net  Fri May 22 21:53:34 2009
From: dan.shumaker at comcast.net (danshumaker)
Date: Fri, 22 May 2009 18:53:34 -0700 (PDT)
Subject: Background subprocess help?
Message-ID: <23680206.post@talk.nabble.com>


Hi,
I'm trying to do something as simple as this:

"sleep 10; mail -s "test" dans < communicate_with_process &"

which executes immediately because it is backgrounded with "&".

or more generically in english:

"do some long process in the background;  send me mail when it's done; allow
me to quit the tool that started launched the long process."

I've found several examples that are close but none of the permeatations I
try work.  The closest examples I've found start sending signals to
processes and/or callbacks and 50+ lines of python code.

I found the cliUtils module which came close.. but no cigar.

I find it hard to believe that a one liner in bash/tcsh has to end up being
many lines in python.  That makes me think I'm missing something.

Surely thousands of people have done this before -- start a background
process and want notification when it's done.

Anybody have any suggestions on modules to  try or quick subprocess commands
that work?  This came close
http://docs.python.org/library/subprocess.html#replacing-shell-pipeline but
no cigar too.

Thank you so much for any help or suggestions.

   -d
-- 
View this message in context: http://www.nabble.com/Background-subprocess-help--tp23680206p23680206.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From ldo at geek-central.gen.new_zealand  Fri May 22 22:18:21 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 23 May 2009 14:18:21 +1200
Subject: What's the use of the else in try/except/else?
References: <gu7f97$mt6$2@reader1.panix.com> <gubblt$igm$4@lust.ihug.co.nz>
	<pan.2009.05.12.09.20.36@REMOVE.THIS.cybersource.com.au>
	<pan.2009.05.12.09.35.36@REMOVE.THIS.cybersource.com.au>
	<8dc983db-b8c4-4897-a58b-969ca5f8e14f@g20g2000vba.googlegroups.com>
Message-ID: <gv7mdd$45j$2@lust.ihug.co.nz>

In message <8dc983db-b8c4-4897-
a58b-969ca5f8e14f at g20g2000vba.googlegroups.com>, Beni Cherniavsky wrote:

> And yes, it's icky - not because of the ``else`` but because
> aquisition-release done correctly is always an icky pattern.

Only in the presence of exceptions.



From ldo at geek-central.gen.new_zealand  Fri May 22 22:26:55 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 23 May 2009 14:26:55 +1200
Subject: UDP reading on multiple sockets
References: <4a0f6de7$0$32667$9b4e6d93@newsspool2.arcor-online.net>
	<15udnX-5wbZ86ZLXnZ2dnUVZ_rednZ2d@posted.usinternet>
	<27bd949f-80b5-44c9-8e3b-c12b49c7ed82@r34g2000vbi.googlegroups.com>
Message-ID: <gv7mtg$4nk$1@lust.ihug.co.nz>

In message <27bd949f-80b5-44c9-8e3b-
c12b49c7ed82 at r34g2000vbi.googlegroups.com>, thomas.vogel at likeabird.de wrote:

> The only honest answer would be that I'm totaly unfamiliar with select
> and also the documentation I found wasn't able to clear the picture.
> So are there examples of using select together with sockets available?

select is easy to use. In Python, you just pass it three lists of file-like 
objects (anything that implements fileno in the way described in the docs), 
together with an optional timeout. It will return three corresponding lists, 
being subsets of the ones you passed (which might all be empty if the 
timeout expired). You then just go through each item in each returned list, 
doing reads (or accepts, as appropriate) from the files that have something 
waiting to be read, writing to the ones waiting for something to be written, 
and perhaps reporting errors and closing the ones that report problems. 
That's basically all there is to it.

This example, of how do implement a timeout on I/O 
<http://codecodex.com/wiki/index.php?title=I/O_With_Timeout>, is in C, but 
it should help you get the idea.



From steve at REMOVE-THIS-cybersource.com.au  Fri May 22 22:53:35 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 23 May 2009 02:53:35 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<r82dnfvPQObYQojXnZ2dnUVZ_q6dnZ2d@posted.usinternet>
	<4A15EB3E.2000006@mrabarnett.plus.com>
	<4A15EF9E.8070406@islandtraining.com> <gv4st8$11t$1@ger.gmane.org>
	<mailman.551.1242955822.8015.python-list@python.org>
	<003290e1$0$9725$c3e8da3@news.astraweb.com>
	<b225774d-2db1-4171-afff-71e489494ae5@o14g2000vbo.googlegroups.com>
Message-ID: <00333f9c$0$9725$c3e8da3@news.astraweb.com>

On Fri, 22 May 2009 13:05:59 -0700, Mark Dickinson wrote:

>> > With a sigh of relief,
>>
>> Yay! We now will have lots of subtle floating point bugs that people
>> can't see! Ignorance is bliss and what you don't know about floating
>> point can't hurt you!
> 
> Why do you think this change will give rise to 'lots of subtle floating
> point bugs'?  The new repr is still faithful, in the sense that if x !=
> y then repr(x) != repr(y).  Personally, I'm not sure that the new repr
> is likely to do anything for floating-point confusion either way.

I'm sorry, did I forget a wink? Apparently I did :)

I don't think this change will *cause* bugs. However, it *may* (and I 
emphasis the may, because it hasn't been around long enough to see the 
effect) allow newbies to remain in blissful ignorance of floating point 
issues longer than they should.

Today, the first time you call repr(0.8) you should notice that the float 
you have is *not quite* the number you thought you had, which alerts you 
to the fact that floats aren't the real numbers you learned about it 
school. From Python 3.1, that reality will be hidden just a little bit 
longer.


[...]
> With the new repr, a float that can be specified with 15 significant
> decimal digits or fewer will always use those digits for its repr. It's
> not a panacea, but I don't see how it's worse than the old repr.

It's only worse in the sense that ignorance isn't really bliss, and this 
change will allow programmers to remain ignorant a little longer. I 
expect that instead of obviously wet-behind-the-ears newbies asking "I'm 
trying to creating a float 0.1, but can't, does Python have a bug?" we'll 
start seeing not-such-newbies asking "I've written a function that 
sometimes misbehaves, and after heroic effort to debug it, I discovered 
that Python has a bug in simple arithmetic, 0.2 + 0.1 != 0.3".

I don't think this will be *worse* than the current behaviour, only bad 
in a different way.


-- 
Steven


From yashgt at gmail.com  Fri May 22 23:07:46 2009
From: yashgt at gmail.com (Yash Ganthe)
Date: Fri, 22 May 2009 20:07:46 -0700 (PDT)
Subject: Looking for module for shrinking a list with n-point means
References: <64997d17-9811-4fb1-a729-c80dd9fbcd9a@g22g2000pra.googlegroups.com>
	<eP6dnSX_2dDcMYvXnZ2dnUVZ_v2dnZ2d@pdx.net>
	<mailman.603.1243019223.8015.python-list@python.org>
Message-ID: <b56c61df-ee42-4eed-af51-7f8f69f54a3c@b6g2000pre.googlegroups.com>

Thanks John,

The code u provided works for me. Indeed it is a simple requirement
and I am a complete novice to Python.

-Yash


From gagsl-py2 at yahoo.com.ar  Fri May 22 23:14:09 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 23 May 2009 00:14:09 -0300
Subject: Ambiguous locale.strxfrm
References: <4a167138$0$6271$9b536df3@news.fv.fi>
Message-ID: <op.uuc4lvhux6zn5v@lepton.softlabbsas.com.ar>

En Fri, 22 May 2009 06:32:40 -0300, Tuomas Vesterinen  
<tuomas.vesterinen at iki.fi> escribi?:

> This was fixed once in Python 2.5, but in Python 3.0 the bug celebrates  
> its comeback. The tail of the strxfrm result is ambiguous.
>
> Python 3.0.1 (r301:69556, Apr 14 2009, 14:30:31)
> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>  >>> import locale
>  >>> locale.setlocale(locale.LC_COLLATE, 'en_US.utf8')
> 'en_US.utf8'
>  >>> key1=locale.strxfrm('maupassant guy')
>  >>>> for i in range(10):
> ...     print(locale.strxfrm('maupassant guy')==key1)
> ...
> False
> True
> False
> False
> False
> False
> False
> False
> False
> False

I could not reproduce the issue on Windows (I don't have any locale using  
utf8) but you should file a bug report at http://bugs.python.org/


-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri May 22 23:56:43 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 23 May 2009 00:56:43 -0300
Subject: Disabling Logging Handler for a Second
References: <839278.93751.qm@web8408.mail.in.yahoo.com>
Message-ID: <op.uuc6ktxkx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 22 May 2009 08:26:49 -0300, VenkataRamaKrishna Boddu  
<bvrkchowdary at yahoo.co.in> escribi?:

> Is there any way, I can disable one logging Handler, while other Log  
> Handler are still available for servicing.....

> import logging;
> import sys;
>
> thelog = logging.getLogger('app.scsi.cdb');
> strmHdlr = logging.StreamHandler(sys.stdout);
> fHdlr = logging.FileHandler('a.log')

Please don't use ; to end statements. In Python, ; is a statement  
*separator*, only required when putting two or more statements in a single  
line. This is very rarely done; I bet most Python users don't even know  
about ;

> ## Now, I want to disable the strmHdlr for some moment without
> ## actually removing the Handler from logger Object,
> ## I want to say something like
> ##
> ## thelog.disable('StreamHandler');
> ##
> ## So., that it disables all the Stream Handlers attached to the Logger  
> Object
>
> ## The Need for me is that, I should write My Email Id only to File  
> Stream
> ## and because of some reasons of moduler design, I don't have  
> references to the
> ## both the Handlers
>
> ## Here, I don't have want to do the StreamHandler removing stuff and  
> adding it again later on
> thelog.removeHandler(strmHdlr);
> thelog.info('Email: bvrkchowdary at yahoo.co.in');

Instead of disable/enable handlers (or remove/reinsert them), use any of  
these:

- Levels: loggers have a minimum level to process, and handlers too. If  
you set the StreamHandler to a slightly higher level than the others, it  
won't process certain messages. You may use the existing level names, or  
create a new one (logging.addLevelName), let's say DETINFO = INFO-5  
(DETailed INFO). Set the logger and the file handler level both to  
DETINFO, and the stream handler to INFO. Then use DETINFO to log the email.

- Filters: You can install a filter onto the stream handler (using  
handler.addFilter) that rejects any record whose msg starts with 'Email:'  
(or whatever you consider apropiate)

-- 
Gabriel Genellina



From mk.fraggod at gmail.com  Sat May 23 00:15:24 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sat, 23 May 2009 10:15:24 +0600
Subject: While Statement
In-Reply-To: <0032680f$0$9718$c3e8da3@news.astraweb.com>
References: <022660c5$0$21875$c3e8da3@news.astraweb.com>
	<mailman.571.1242984862.8015.python-list@python.org>
	<00325a9c$0$9685$c3e8da3@news.astraweb.com>
	<mailman.575.1242991149.8015.python-list@python.org>
	<0032680f$0$9718$c3e8da3@news.astraweb.com>
Message-ID: <20090523101524.33b07ef0@coercion>

On Fri, 22 May 2009 21:33:05 +1000
Joel Ross <joelc at cognyx.com> wrote:

> changed it to "float(number)/total*100" and it worked thanks for all 
> your help appreciated

I believe operator.truediv function also deserves a mention here, since
line "op.truediv(number, total) * 100" somehow seem to make more sense
to me than an explicit conversion.
There's also "op.itruediv" for "number /= float(total) * 100" case.

http://docs.python.org/dev/library/operator.html

-- 
Mike Kazantsev // fraggod.net
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From gagsl-py2 at yahoo.com.ar  Sat May 23 00:41:54 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 23 May 2009 01:41:54 -0300
Subject: Disabling Logging Handler for a Second
References: <839278.93751.qm@web8408.mail.in.yahoo.com>
	<op.uuc6ktxkx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <op.uuc8n4hdx6zn5v@lepton.softlabbsas.com.ar>

En Sat, 23 May 2009 00:56:43 -0300, Gabriel Genellina  
<gagsl-py2 at yahoo.com.ar> escribi?:

> - Filters: You can install a filter onto the stream handler (using  
> handler.addFilter) that rejects any record whose msg starts with  
> 'Email:' (or whatever you consider apropiate)

s/apropiate/appropriate/

-- 
Gabriel Genellina



From joelc at cognyx.com  Sat May 23 01:33:00 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sat, 23 May 2009 15:33:00 +1000
Subject: Problems with sys.stout.flush()
Message-ID: <0033652b$0$9724$c3e8da3@news.astraweb.com>

Hi all,

I'm using python 2.5 and trying to flush the sys.stout buffer with 
sys.stout.flush(), but doesn't seem to work. Each time a line is printed 
   it appends the one before it I need to clear the output and write a 
new output without appending the previous one. I have tried the -u 
(unbuffered) option for python and a few examples from this site 
http://stackoverflow.com/questions/107705/python-output-buffering

Code:

import sys
from time import sleep

def progress(number, total,  char):

     percentage = float(number*100)/total
     percentage = int(round(percentage))
     percentage = int(100 - percentage)
     if percentage > 0:
         char = char * percentage
         sys.stdout.write(char)
         sys.stdout.flush()      #Not working correctly
         sleep(2)

progress(40, 50, "*")
progress(30, 50, "*")
progress(20, 50, "*")
progress(10, 50, "*")
progress(2, 50, "*")

Regards

jross


From pavlovevidence at gmail.com  Sat May 23 02:47:44 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 22 May 2009 23:47:44 -0700 (PDT)
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
Message-ID: <a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>

On May 22, 10:33?pm, Joel Ross <jo... at cognyx.com> wrote:
> Hi all,
>
> I'm using python 2.5 and trying to flush the sys.stout buffer with
> sys.stout.flush(), but doesn't seem to work. Each time a line is printed
> ? ?it appends the one before it I need to clear the output and write a
> new output without appending the previous one.

That's not how streams work, chief.  Once you output (and flush)
something you can't un-output it.

What you probably want to do is to write a carriage return ("\r")
which usually causes the cursor to return to the beginning of the
line, so that any new text you write overwrites the old text.

This has nothing to do with flushing; flushing doesn't erase or clear
the old input.  Flushing is usually needed for a different reason,
however, namely standard output doesn't actually get sent to the
console until it sees a newline ("\n") unless you flush the buffer.

Try to adapt this example to your problem:

for i in xrange(11):
    sys.stdout.write('*'*(10-i) + ' '*i + '\r')
    sys.stdout.flush()
    time.sleep(2)


Notice that you have to print out spaces as well, to overwrite the
previous characters on the line (well, it might not be strictly needed
for a progress bar that only grows, but it's normally a good idea.


> I have tried the -u
> (unbuffered) option for python and a few examples from this sitehttp://stackoverflow.com/questions/107705/python-output-buffering
>
> Code:
>
> import sys
> from time import sleep
>
> def progress(number, total, ?char):
>
> ? ? ?percentage = float(number*100)/total
> ? ? ?percentage = int(round(percentage))
> ? ? ?percentage = int(100 - percentage)
> ? ? ?if percentage > 0:
> ? ? ? ? ?char = char * percentage
> ? ? ? ? ?sys.stdout.write(char)
> ? ? ? ? ?sys.stdout.flush() ? ? ?#Not working correctly
> ? ? ? ? ?sleep(2)
>
> progress(40, 50, "*")
> progress(30, 50, "*")
> progress(20, 50, "*")
> progress(10, 50, "*")
> progress(2, 50, "*")
>
> Regards
>
> jross



Carl Banks


From lepto.python at gmail.com  Sat May 23 03:48:38 2009
From: lepto.python at gmail.com (oyster)
Date: Sat, 23 May 2009 15:48:38 +0800
Subject: html ui + py background? any tut?
Message-ID: <6a4f17690905230048p6c28cedek73dc49a9ea0fd9fb@mail.gmail.com>

I have read for many times that the modern appliaction (not a web one,
but desktop on) uses html + js for its UI, and python code is for the
background work
but I have never found event a simple (yet completed) article on how
to develop such a thing from scrach in these advocacy thing.

Can anyone point out some simple, can-be-followed tutorial on such
thing especially for windows os?

thanx


From tuomas.vesterinen at iki.fi  Sat May 23 05:09:59 2009
From: tuomas.vesterinen at iki.fi (Tuomas Vesterinen)
Date: Sat, 23 May 2009 12:09:59 +0300
Subject: Ambiguous locale.strxfrm
In-Reply-To: <mailman.610.1243048432.8015.python-list@python.org>
References: <4a167138$0$6271$9b536df3@news.fv.fi>
	<mailman.610.1243048432.8015.python-list@python.org>
Message-ID: <4a17bd67$0$24790$9b536df3@news.fv.fi>


Thanks. Bug report done, issue 6093.

Tuomas Vesterinen

Gabriel Genellina wrote:
> En Fri, 22 May 2009 06:32:40 -0300, Tuomas Vesterinen 
> <tuomas.vesterinen at iki.fi> escribi?:
> 
>> This was fixed once in Python 2.5, but in Python 3.0 the bug 
>> celebrates its comeback. The tail of the strxfrm result is ambiguous.
>>
>> Python 3.0.1 (r301:69556, Apr 14 2009, 14:30:31)
>> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>>  >>> import locale
>>  >>> locale.setlocale(locale.LC_COLLATE, 'en_US.utf8')
>> 'en_US.utf8'
>>  >>> key1=locale.strxfrm('maupassant guy')
>>  >>>> for i in range(10):
>> ...     print(locale.strxfrm('maupassant guy')==key1)
>> ...
>> False
>> True
>> False
>> False
>> False
>> False
>> False
>> False
>> False
>> False
> 
> I could not reproduce the issue on Windows (I don't have any locale 
> using utf8) but you should file a bug report at http://bugs.python.org/
> 
> 


From joelc at cognyx.com  Sat May 23 05:20:47 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sat, 23 May 2009 19:20:47 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
Message-ID: <0227b2f0$0$25303$c3e8da3@news.astraweb.com>

Carl Banks wrote:
> On May 22, 10:33 pm, Joel Ross <jo... at cognyx.com> wrote:
>> Hi all,
>>
>> I'm using python 2.5 and trying to flush the sys.stout buffer with
>> sys.stout.flush(), but doesn't seem to work. Each time a line is printed
>>    it appends the one before it I need to clear the output and write a
>> new output without appending the previous one.
> 
> That's not how streams work, chief.  Once you output (and flush)
> something you can't un-output it.
> 
> What you probably want to do is to write a carriage return ("\r")
> which usually causes the cursor to return to the beginning of the
> line, so that any new text you write overwrites the old text.
> 
> This has nothing to do with flushing; flushing doesn't erase or clear
> the old input.  Flushing is usually needed for a different reason,
> however, namely standard output doesn't actually get sent to the
> console until it sees a newline ("\n") unless you flush the buffer.
> 
> Try to adapt this example to your problem:
> 
> for i in xrange(11):
>     sys.stdout.write('*'*(10-i) + ' '*i + '\r')
>     sys.stdout.flush()
>     time.sleep(2)
> 
Your example prints a new line each time, Doesn't help me with a 
progress bar, do you know of anyway doing it with the print command? My 
progress bars works fine this is the only problem im having with it at 
the moment. any help would be appreciated.

cheers
> 
> Notice that you have to print out spaces as well, to overwrite the
> previous characters on the line (well, it might not be strictly needed
> for a progress bar that only grows, but it's normally a good idea.
> 
> 
>> I have tried the -u
>> (unbuffered) option for python and a few examples from this sitehttp://stackoverflow.com/questions/107705/python-output-buffering
>>
>> Code:
>>
>> import sys
>> from time import sleep
>>
>> def progress(number, total,  char):
>>
>>      percentage = float(number*100)/total
>>      percentage = int(round(percentage))
>>      percentage = int(100 - percentage)
>>      if percentage > 0:
>>          char = char * percentage
>>          sys.stdout.write(char)
>>          sys.stdout.flush()      #Not working correctly
>>          sleep(2)
>>
>> progress(40, 50, "*")
>> progress(30, 50, "*")
>> progress(20, 50, "*")
>> progress(10, 50, "*")
>> progress(2, 50, "*")
>>
>> Regards
>>
>> jross
> 
> 
> 
> Carl Banks


From david.lyon at preisshare.net  Sat May 23 05:24:14 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Sat, 23 May 2009 05:24:14 -0400
Subject: html ui + py =?UTF-8?Q?background=3F=20any=20tut=3F?=
In-Reply-To: <6a4f17690905230048p6c28cedek73dc49a9ea0fd9fb@mail.gmail.com>
References: <6a4f17690905230048p6c28cedek73dc49a9ea0fd9fb@mail.gmail.com>
Message-ID: <c3c9aea49d75ab1914ebaa826f03d57a@preisshare.net>


Hi,

I don't know any tutorial either...

At work, we have made gui apps using wxpython to make the gui...

wxpython has html viewer component...

you can use Cheetah or another template engine to make the
html...

It's pretty easy and effective...

David


On Sat, 23 May 2009 15:48:38 +0800, oyster <lepto.python at gmail.com> wrote:
> I have read for many times that the modern appliaction (not a web one,
> but desktop on) uses html + js for its UI, and python code is for the
> background work
> but I have never found event a simple (yet completed) article on how
> to develop such a thing from scrach in these advocacy thing.
> 
> Can anyone point out some simple, can-be-followed tutorial on such
> thing especially for windows os?
> 
> thanx


From pavlovevidence at gmail.com  Sat May 23 05:38:29 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 23 May 2009 02:38:29 -0700 (PDT)
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
Message-ID: <fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>

On May 23, 2:20?am, Joel Ross <jo... at cognyx.com> wrote:
> Carl Banks wrote:
> > On May 22, 10:33 pm, Joel Ross <jo... at cognyx.com> wrote:
> >> Hi all,
>
> >> I'm using python 2.5 and trying to flush the sys.stout buffer with
> >> sys.stout.flush(), but doesn't seem to work. Each time a line is printed
> >> ? ?it appends the one before it I need to clear the output and write a
> >> new output without appending the previous one.
>
> > That's not how streams work, chief. ?Once you output (and flush)
> > something you can't un-output it.
>
> > What you probably want to do is to write a carriage return ("\r")
> > which usually causes the cursor to return to the beginning of the
> > line, so that any new text you write overwrites the old text.
>
> > This has nothing to do with flushing; flushing doesn't erase or clear
> > the old input. ?Flushing is usually needed for a different reason,
> > however, namely standard output doesn't actually get sent to the
> > console until it sees a newline ("\n") unless you flush the buffer.
>
> > Try to adapt this example to your problem:
>
> > for i in xrange(11):
> > ? ? sys.stdout.write('*'*(10-i) + ' '*i + '\r')
> > ? ? sys.stdout.flush()
> > ? ? time.sleep(2)
>
> Your example prints a new line each time,

Did you run it and observe what happened, or did you just guess what
it actually did?  On my system it doesn't print new lines.


> Doesn't help me with a
> progress bar, do you know of anyway doing it with the print command? My
> progress bars works fine this is the only problem im having with it at
> the moment. any help would be appreciated.

Well, based on the code you posted it doesn't look like your progress
bar is fine.

Anyway, you haven't described the problem you are having very well,
and we can guess what might be wrong but if you want better help
you're going to have to describe your problem more coherently.  Give
us the

1. What code are you actually running (cut-and-paste, please, don't
retype).
2. What do you expect the code to output (type in actual output you
expect to see, not merely a description).
3. What does the code actually output when you run it (cut-and paste,
please, don't just describe).
4. Include any tracebacks if there are any.

In the meantime, I repeat my suggestion that you take my example and
adapt it to what you are doing.

One other note: the print statement is unsuitable for this task
because it always prints a trailing whitespace.  Use sys.stdout.write
for it.


Carl Banks


From medmediani at gmail.com  Sat May 23 06:13:32 2009
From: medmediani at gmail.com (Mohammed Mediani)
Date: Sat, 23 May 2009 12:13:32 +0200
Subject: Problems with sys.stout.flush()
In-Reply-To: <0033652b$0$9724$c3e8da3@news.astraweb.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
Message-ID: <1aa8f3840905230313o70d85d2w7fca3cd974f21606@mail.gmail.com>

Hi all,
Is anyone aware of a 3-d plotting tool for simple mathematical functions. It
seems that all the tools available have their problems with new versions.
None of matplotlib, nor PyX, nor mat3d,.... seems to work for 3d anymore.
Any suggestions???
Thanks
-------------- next part --------------
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From joelc at cognyx.com  Sat May 23 06:49:13 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sat, 23 May 2009 20:49:13 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
Message-ID: <0033af48$0$9681$c3e8da3@news.astraweb.com>

Carl Banks wrote:
> On May 23, 2:20 am, Joel Ross <jo... at cognyx.com> wrote:
>> Carl Banks wrote:
>>> On May 22, 10:33 pm, Joel Ross <jo... at cognyx.com> wrote:
>>>> Hi all,
>>>> I'm using python 2.5 and trying to flush the sys.stout buffer with
>>>> sys.stout.flush(), but doesn't seem to work. Each time a line is printed
>>>>    it appends the one before it I need to clear the output and write a
>>>> new output without appending the previous one.
>>> That's not how streams work, chief.  Once you output (and flush)
>>> something you can't un-output it.
>>> What you probably want to do is to write a carriage return ("\r")
>>> which usually causes the cursor to return to the beginning of the
>>> line, so that any new text you write overwrites the old text.
>>> This has nothing to do with flushing; flushing doesn't erase or clear
>>> the old input.  Flushing is usually needed for a different reason,
>>> however, namely standard output doesn't actually get sent to the
>>> console until it sees a newline ("\n") unless you flush the buffer.
>>> Try to adapt this example to your problem:
>>> for i in xrange(11):
>>>     sys.stdout.write('*'*(10-i) + ' '*i + '\r')
>>>     sys.stdout.flush()
>>>     time.sleep(2)
>> Your example prints a new line each time,
> 
> Did you run it and observe what happened, or did you just guess what
> it actually did?  On my system it doesn't print new lines.
> 
> 
>> Doesn't help me with a
>> progress bar, do you know of anyway doing it with the print command? My
>> progress bars works fine this is the only problem im having with it at
>> the moment. any help would be appreciated.
> 
> Well, based on the code you posted it doesn't look like your progress
> bar is fine.
> 
> Anyway, you haven't described the problem you are having very well,
> and we can guess what might be wrong but if you want better help
> you're going to have to describe your problem more coherently.  Give
> us the
> 
> 1. What code are you actually running (cut-and-paste, please, don't
> retype).
> 2. What do you expect the code to output (type in actual output you
> expect to see, not merely a description).
> 3. What does the code actually output when you run it (cut-and paste,
> please, don't just describe).
> 4. Include any tracebacks if there are any.
> 
> In the meantime, I repeat my suggestion that you take my example and
> adapt it to what you are doing.
> 
> One other note: the print statement is unsuitable for this task
> because it always prints a trailing whitespace.  Use sys.stdout.write
> for it.
> 
> 
> Carl Banks
Hey,

The only reason I didn't supply full details is because I thought it may 
just be something simple I was missing. Sorry for the confusing. Well 
here's the full code.

import sys, os
from time import sleep


class progress:

     def progressbar(self, number, total,  char):

         percentage = float(number*100)/total
         percentage = int(round(percentage))
         percentage = int(100 - percentage)
         self.f=sys.stdout
         if percentage > 0:
             char = char * percentage
             self.f.write(char)
             self.f.flush()      	
             sleep(0.2)


     def countlines(self, file):

         lineCount = 0
         f = open(file)
         it = iter(f)
         try:
             while it.next():
                 lineCount += 1
         except StopIteration:
                     pass
         return lineCount


def main():

     p = progress()
     lines = 5
     #lines = p.countlines("/tmp/junk")
     count = lines
     for i in xrange(lines):
         p.progressbar(count, lines, "*")
         count -=1
     print "Finished"

if __name__ == "__main__":
         main()

For now we can ignore the countlines() function. I need a nice progress 
display e.g. ********************** continuing on til it reaches 100% I 
need this to print out on one line only. At the moment it does do this, 
only problem is its appends the print out from the last print out. I 
need it to clear the last print out and then print the new print out 
without appending the last.

So when it prints a progress at 50% it will print 50 (*) characters and 
if the next progress is 51% it will print 51 (*) characters including 
the last 50 (*) characters, so instead on ending up with 100 (*) 
characters I end up with a shit load of them depending on how many lines 
I pass to the progressbar() function.

Needed Output:
***************************************************************************************************Finished


Current Output:
********************************************************************************************************************************************************************************************************Finished

Note: As you can see I'm only sending 5 lines to the progressbar() 
function and It prints this many characters, so you could imagine if I 
have 10000 lines I would end up with a heap of * characters.

Regards
jross








From timothywayne.cook at gmail.com  Sat May 23 07:02:00 2009
From: timothywayne.cook at gmail.com (Tim Cook)
Date: Sat, 23 May 2009 04:02:00 -0700 (PDT)
Subject: Abstract Classes
Message-ID: <e31135b4-fc06-4b8c-be15-7872bc81eb1d@g37g2000yqn.googlegroups.com>

I am implementing a set of specifications that were designed to be OO
language neutral.

Several classes are specified as being abstract; so therefore there
should be no instances of them, correct?

However in the classes that are subclasses what is the correct way in
Python to implement them?
I am using the zope.interface module as well.

For example:

class IA(Interface):
   m = Int()
   p = TextLine()

class IB(Interface):

   x = Bool()
   s = Text()



class A(object):
""" This is an abstract class with attributes m is an int and p is a
string"""

   implements(IA)
   pass

class B(A):
  implements(IB)

  def __init__(self,m,p,x,s):
    m=m
    p=p
    x=x
    s=s


or should it be like:

class A(object):
""" This is an abstract class with attributes m is an int and p is a
string"""

   implements(IA)

   def __init__(self,m,p):
     m=m
     p=p


class B(A):
  implements(IB)

  def __init__(self,m,p,x,s):
    A.__init__(m,p)
    x=x
    s=s


or maybe even:

class B(A):
  implements(IB)

  def __init__(self,m,p,x,s):
    super(A.__init__(m,p))
    x=x
    s=s

Thanks for any pointers.

Tim


--
Timothy Cook, MSc
Health Informatics Research & Development Services
LinkedIn Profile:http://www.linkedin.com/in/timothywaynecook
Skype ID == timothy.cook
**************************************************************
*You may get my Public GPG key from  popular keyservers or   *
*from this link http://timothywayne.cook.googlepages.com/home*
**************************************************************


From pavlovevidence at gmail.com  Sat May 23 07:57:24 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 23 May 2009 04:57:24 -0700 (PDT)
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
Message-ID: <6ca8919e-2984-482b-b34c-8cde032ca456@o5g2000prh.googlegroups.com>

On May 23, 3:49?am, Joel Ross <jo... at cognyx.com> wrote:
> ? ? ?def progressbar(self, number, total, ?char):
>
> ? ? ? ? ?percentage = float(number*100)/total
> ? ? ? ? ?percentage = int(round(percentage))
> ? ? ? ? ?percentage = int(100 - percentage)
> ? ? ? ? ?self.f=sys.stdout
> ? ? ? ? ?if percentage > 0:
> ? ? ? ? ? ? ?char = char * percentage
> ? ? ? ? ? ? ?self.f.write(char)
> ? ? ? ? ? ? ?self.f.flush() ? ? ? ? ? ?
> ? ? ? ? ? ? ?sleep(0.2)
[snip]
> So when it prints a progress at 50% it will print 50 (*) characters and
> if the next progress is 51% it will print 51 (*) characters including
> the last 50 (*) characters, so instead on ending up with 100 (*)
> characters I end up with a shit load of them depending on how many lines
> I pass to the progressbar() function.

Here's why: when you write "char = char * percentage", you are setting
char to a string, so on the next iteration char is the string you
printed last time.  Thus char grows factorially with iterations.  Not
good.

Instead, change char to some other name so you don't ever overwrite
it; char should always be just one character.

             bar = char * percentage
             self.f.write(bar)


Carl Banks


From gdamjan at gmail.com  Sat May 23 08:13:21 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Sat, 23 May 2009 14:13:21 +0200
Subject: html ui + py background? any tut?
References: <mailman.614.1243064920.8015.python-list@python.org>
Message-ID: <2s5le6-u65.ln1@archaeopteryx.softver.org.mk>



> I have read for many times that the modern appliaction (not a web one,
> but desktop on) uses html + js for its UI, and python code is for the
> background work
> but I have never found event a simple (yet completed) article on how
> to develop such a thing from scrach in these advocacy thing.
> 
> Can anyone point out some simple, can-be-followed tutorial on such
> thing especially for windows os?

That's very very simple to do with PyQt and Qts Webkit. You can export 
Python objects to the HTML/JS application running in Webkit.

You'll just need to read the Qt Webkit documentation to see how it's all 
done.

This is actually a very good strategy for new apps, you can easily make 
them skinable with  html/js skins for ex.



-- 
?????? ( http://softver.org.mk/damjan/ )

Well when _I_ was in school, I had to run Netscape on HP/UX, displayed 
on my local X Server running on a Windows 3.1 box. Displayed over a 2400 
baud modem. Uphill. Both ways. In the rain. With NOBODY to hold my 
hands. Because the life of the geek is a lonely life.
- aclarke on /.



From inigoserna at gmail.com  Sat May 23 08:17:31 2009
From: inigoserna at gmail.com (=?UTF-8?B?ScOxaWdvIFNlcm5h?=)
Date: Sat, 23 May 2009 14:17:31 +0200
Subject: [OT] Python hunting
Message-ID: <65a1d6f80905230517w503f752bx5e4a4eebe1e83482@mail.gmail.com>

Hi,

excuse me for the off-topic, but today I've seen this video and...
and... well, it's amazing

http://dailymotion.virgilio.it/search/chasse%2Ben%2Bafrique/video/xz3rz_les-pythons-aiment-les-jambes_animals

It's in French, but the audio it's not important.

Kind regards,
I?igo Serna


From responsible7 at gmail.com  Sat May 23 08:49:56 2009
From: responsible7 at gmail.com (responsible7 at gmail.com)
Date: Sat, 23 May 2009 05:49:56 -0700 (PDT)
Subject: PureData py/pyExt into standalone python
Message-ID: <a3e7e823-2872-4a49-9d04-82058638aff3@z7g2000vbh.googlegroups.com>

Hi guys,

Short version:

I've written some python classes for py/pyExt extensions for the
"dataflow" graphical programming environment PureData. Here's an
example PureData screenshot for clarity:

	see: http://i40.tinypic.com/2rrx6gy.jpg

My classes talk to eachother via the PureData system, and they talk to
the outside world via pyPortMIDI (which enables raw MIDI data
communication).

PureData encourages modularisation, so I've written several classes:
* some that receive raw MIDI data,
* some that parse this into human-readable tokens,
* some that just generate human-readable tokens,
* and some that parse human-readable tokens then send raw MIDI data

I want to join these together as a stand-alone python application,
using internal python communication instead of PureData...

...but I don't know how to do this. The only python I know comes from
writing using the pyExt API, and the PureData API (which is written in
C).

----
Long(er) version:

Miller Pukette's PureData: http://puredata.info/
Thomas Grill's Flext: http://puredata.info/Members/thomas/flext
Thomas Grill's Py/Pyext: http://puredata.info/Members/thomas/py/
John Harrison's PyPortMIDI: http://www.media.mit.edu/~harrison/code.html
CMU's PortMIDI: http://www.cs.cmu.edu/~music/portmusic/

PureData is a graphical "dataflow" programming environment that (among
many, many other things!) allows for very rapid development of Audio
and MIDI processing. Objects in PureData (and MaxMSP) communicate by
sending messages through "patch cords" that connect an "outlet" to an
"inlet" of another object.

Thomas Grill's py/pyExt allows python code to be embedded as a
PureData object. The benefit being that this python code can be
effortlessly ported across multiple platforms (win32/linux/osx) and
also to the highly related (but more commercial) Cycling'74 MaxMSP
system. (PureData object code is written in C and generally not easy
to port between platforms, nor between PD and MaxMSP - so writing
portable python objects is a boon!)

a pyExt object sends messages from its outlets using the line:


	self._outlet(outlet_id,message_to_send)


a pyExt object performs actions when a message arrives at an inlet. An
integer arriving at inlet 1 could be attached to this method code:


	def int_1(self,*arg):
		print "received integer:",arg[0]

If these pieces of code were in separate python classes - how would I
connect two objects together such that an integer was passed between
the two?

If the first object sent 42, in puredata it would look like this:

http://i44.tinypic.com/15eh74p.gif

useless fact: the screenshot doubles up (i.e. "pyext sender sender")
due to the first word being the python file (i.e. sender.py), whilst
the second is the name of the object class (i.e class sender
(pyext._class)

----
Maybe a more tricky question is:

PureData supports "message busses" - messages sent to named busses can
be broadcast to multiple locations. How would I connect objects up in
this way using python?

a pyExt object registers to receive messages on a certain bus using:


	self._bind(bus_name,self.method_to_call)

	def method_to_call(self,*arg):
		print "a message on", bus_name, "arrived"
		print "the message was", len(arg), "long"
		print "and had the values", arg, "inside"


a pyExt object sends messages to a particular bus by using:


	self._send(bus_name,message_to_send)


From pigmartian at gmail.com  Sat May 23 09:00:15 2009
From: pigmartian at gmail.com (pigmartian at gmail.com)
Date: Sat, 23 May 2009 06:00:15 -0700 (PDT)
Subject: Replacing module with a stub for unit testing
Message-ID: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>

Hi,

I'm working on a unit test framework for a module.  The module I'm
testing indirectly calls another module which is expensive to access
--- CDLLs whose functions access a database.

    test_MyModule --->MyModule--->IntermediateModule---
>ExpensiveModule

I want to create a stub of ExpensiveModule and have that be accessed
by IntermediateModule instead of the real version

    test_MyModule --->MyModule--->IntermediateModule---
>ExpensiveModuleStub

I tried the following in my unittest:

    import ExpensiveModuleStub
    sys.modules['ExpensiveModule'] = ExpensiveModuleStub # Doesn't
work

But, import statements in the IntermediateModule still access the real
ExpensiveModule, not the stub.

The examples I can find of creating and using Mock or Stub objects
seem to all follow a pattern where the fake objects are passed in as
arguments to the code being tested.  For example, see the "Example
Usage" section here: http://python-mock.sourceforge.net.  But that
doesn't work in my case as the module I'm testing doesn't directly use
the module that I want to replace.

Can anybody suggest something?

Thanks,

Scott


From vincent at vincentdavis.net  Sat May 23 09:08:49 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sat, 23 May 2009 07:08:49 -0600
Subject: error in tutorial for 3.0, section 9.3.3
Message-ID: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>

Section 9.3.3 says that given,
class MyClass:
    """A simple example class"""
    i = 12345
    def f(self):
        return 'hello world'

and x = MyClass()
then this

x.counter = 1
while x.counter < 10:
    x.counter = x.counter * 2
print(x.counter)
del x.counter

will print 16

link,
http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes

I am reading this section so to learn about classes but if this is right I
think I need to start over.


Thanks
Vincent Davis
720-301-3003
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From vincent at vincentdavis.net  Sat May 23 09:13:29 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sat, 23 May 2009 07:13:29 -0600
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
Message-ID: <77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>

let me add that I see that this could be right if x.counter = 1 and counter
need not have anything to do with MyClass but this could be more clear.
Thanks
Vincent Davis
720-301-3003


On Sat, May 23, 2009 at 7:08 AM, Vincent Davis <vincent at vincentdavis.net>wrote:

> Section 9.3.3 says that given,
> class MyClass:
>     """A simple example class"""
>     i = 12345
>     def f(self):
>         return 'hello world'
>
> and x = MyClass()
> then this
>
> x.counter = 1
> while x.counter < 10:
>     x.counter = x.counter * 2
> print(x.counter)
> del x.counter
>
> will print 16
>
> link,
> http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes
>
> I am reading this section so to learn about classes but if this is right I
> think I need to start over.
>
>
> Thanks
> Vincent Davis
> 720-301-3003
>
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From ebonak at hotmail.com  Sat May 23 09:22:59 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 23 May 2009 09:22:59 -0400
Subject: Optimizing math functions
Message-ID: <gv8tbl$ph3$1@ger.gmane.org>

Hello all,

I would like to maximize or minimize a given math function over a
specific set of values, in Python preferably.

I was checking out Wolfram Alpha (http://www70.wolframalpha.com/)
and it can do simple optimization problems in math, such as

     maximize 15*x - x**2 over 0 to 15

     (http://www70.wolframalpha.com/input/?i=maximize+15*x+-+x**2+over+0+to+15)

which finds the maximum value and input for x in the range 0 to 15.
Very cool. (This is of course a very simple example).

What it apparently can't do is for maximize (or minimize) functions
that contain two variables, x and y, or more. So for example a simple
example would be

    maximize x**2 + y**2 over x:0 to 15, y:0-12  -- this does not work
                                                 -- though I'm unclear about
                                                 -- the correct syntax too.

Is there some sort of simple Python module that would allow me to
evaluate this type of function?

In this particular instance I am interested in the minimum of

   x * sin(4*x) + 1.1 * sin(2*y), where x,y in range 0-10

though in other problems the range may not be identical for x and y.

Thanks,

Esmail

ps: Does anyone know if Octave or some other free Linux (or Windows)
     program might also do this in a simple way? My preference would
     still be a Python solution that would be simple to use, ie plug in
     the function, the ranges and have it pop out the solution :-)



From albert at spenarnc.xs4all.nl  Sat May 23 09:24:46 2009
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 23 May 2009 13:24:46 GMT
Subject: Representing a Tree in Python
References: <dbe30341-5858-4553-985f-065d78eb5dcc@b7g2000pre.googlegroups.com>
	<22aa25ec-4a47-4d91-96ed-4b9748a59dc6@n4g2000vba.googlegroups.com>
	<43289c33-04b9-4cbc-9823-d8a4ee86dbba@y33g2000prg.googlegroups.com>
Message-ID: <kk3mla.lkl@spenarnc.xs4all.nl>

In article <43289c33-04b9-4cbc-9823-d8a4ee86dbba at y33g2000prg.googlegroups.com>,
godshorse  <chinthakawk at gmail.com> wrote:
>On May 13, 11:54=A0am, CTO <debat... at gmail.com> wrote:
>> On May 13, 12:10=A0am, godshorse <chinthak... at gmail.com> wrote:
>>
>> > Hello,
>>
>> > I want to find out the shortest path tree from a root to several nodes
>> > in a graph data structure. I found a Dijkstra code from internet that
>> > finds shortest path between only two nodes. How can i extend it to a
>> > tree?. And what is the best way to represent a tree in Python?.

<SNIP>

>
>Thanks very much for your reply Geremy. That site was interesting.
>
>Actually the Graph building part is already completed now. I used a
>dictionary for that and it works fine. for Dijkstra shortest path
>problem your suggestion can be used.
>
>But let me clear the my problem again. I have a graph. and I want to
>find 'shortest path tree' from a root node to several nodes. as a
>example if we have a graph of 5 nodes from 1 to 5, I need to build the
>shortest path tree from node 1 to nodes 2,3,5. So my question is
>instead of keeping separate lists for each destination node's shortest
>path. How can I represent and store them in a tree structure using
>python. Then I can easily find out what are the common nodes in the
>path to each destination.

If I understand correctly, you want to know the path given
the end-node. Common sense dictates that you use back links
if that has to be done with decent efficiency.
The back links can be added as part of the algorithm.

>
>Thanks once again.

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- like all pyramid schemes -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From steve at REMOVE-THIS-cybersource.com.au  Sat May 23 09:25:05 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 23 May 2009 13:25:05 GMT
Subject: Replacing module with a stub for unit testing
References: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>
Message-ID: <0033d39f$0$9725$c3e8da3@news.astraweb.com>

On Sat, 23 May 2009 06:00:15 -0700, pigmartian wrote:

> Hi,
> 
> I'm working on a unit test framework for a module.  The module I'm
> testing indirectly calls another module which is expensive to access ---
> CDLLs whose functions access a database.
...
> The examples I can find of creating and using Mock or Stub objects seem
> to all follow a pattern where the fake objects are passed in as
> arguments to the code being tested.  For example, see the "Example
> Usage" section here: http://python-mock.sourceforge.net.  But that
> doesn't work in my case as the module I'm testing doesn't directly use
> the module that I want to replace.
> 
> Can anybody suggest something?

Sounds like a job for monkey-patching!

Currently, you have this:

# inside test_MyModule:
import MyModule
test_code()


# inside MyModule:
import IntermediateModule


# inside IntermediateModule:
import ExpensiveModule


You want to leave MyModule and IntermediateModule as they are, but 
replace ExpensiveModule with MockExpensiveModule. Try this:

# inside test_MyModule:
import MyModule
import MockExpensiveModule
MyModule.IntermediateModule.ExpensiveModule = MockExpensiveModule
test_code()



That should work, unless IntermediateModule uses "from ExpensiveModule 
import functions" instead of "import ExpensiveModule". In that case, you 
will have to monkey-patch each individual object rather than the entire 
module:

MyModule.IntermediateModule.afunc = MockExpensiveModule.afunc
MyModule.IntermediateModule.bfunc = MockExpensiveModule.bfunc
MyModule.IntermediateModule.cfunc = MockExpensiveModule.cfunc
# etc...



-- 
Steven


From ben+python at benfinney.id.au  Sat May 23 09:27:51 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sat, 23 May 2009 23:27:51 +1000
Subject: Replacing module with a stub for unit testing
References: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>
Message-ID: <878wkoymnc.fsf@benfinney.id.au>

pigmartian at gmail.com writes:

> 
>     import ExpensiveModuleStub
>     sys.modules['ExpensiveModule'] = ExpensiveModuleStub # Doesn't
> work
> 
> But, import statements in the IntermediateModule still access the real
> ExpensiveModule, not the stub.
> 
> The examples I can find of creating and using Mock or Stub objects
> seem to all follow a pattern where the fake objects are passed in as
> arguments to the code being tested. For example, see the "Example
> Usage" section here: http://python-mock.sourceforge.net. But that
> doesn't work in my case as the module I'm testing doesn't directly use
> the module that I want to replace.
> 
> Can anybody suggest something?

The ?MiniMock? library <URL:http://pypi.python.org/pypi/MiniMock>
addresses this by mocking objects via namespace.

If you know the code under test will import ?spam.eggs.beans?, import
that yourself in your unit test module, then mock the object with
?minimock.mock('spam.eggs.beans')?. Whatever object was at that name
will be mocked (until ?minimock.restore()?), and other code referring to
that name will get the mocked object.

-- 
 \     ?When I turned two I was really anxious, because I'd doubled my |
  `\   age in a year. I thought, if this keeps up, by the time I'm six |
_o__)                                  I'll be ninety.? ?Steven Wright |
Ben Finney


From steve at REMOVE-THIS-cybersource.com.au  Sat May 23 09:55:43 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 23 May 2009 13:55:43 GMT
Subject: Optimizing math functions
References: <mailman.619.1243084999.8015.python-list@python.org>
Message-ID: <0033dace$0$9725$c3e8da3@news.astraweb.com>

On Sat, 23 May 2009 09:22:59 -0400, Esmail wrote:

> Hello all,
> 
> I would like to maximize or minimize a given math function over a
> specific set of values, in Python preferably.
...
> What it apparently can't do is for maximize (or minimize) functions that
> contain two variables, x and y, or more. 

Function minimization is a well-studied problem. You will find oodles of 
references to doing function minimization if you google. In fact, if you 
google for "python function minimization" you should find about 63,000 
links.

Minimizing functions of two variables is difficult, as a general rule. 
Nevertheless, there are tools for doing so. Check out SciPy.



-- 
Steven


From ebonak at hotmail.com  Sat May 23 10:06:09 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 23 May 2009 10:06:09 -0400
Subject: Optimizing math functions
In-Reply-To: <0033dace$0$9725$c3e8da3@news.astraweb.com>
References: <mailman.619.1243084999.8015.python-list@python.org>
	<0033dace$0$9725$c3e8da3@news.astraweb.com>
Message-ID: <4A1802D1.8070603@hotmail.com>

Steven D'Aprano wrote:
> On Sat, 23 May 2009 09:22:59 -0400, Esmail wrote:
> 
>> Hello all,
>>
>> I would like to maximize or minimize a given math function over a
>> specific set of values, in Python preferably.
> ...
>> What it apparently can't do is for maximize (or minimize) functions that
>> contain two variables, x and y, or more. 
> 
> Function minimization is a well-studied problem. You will find oodles of 
> references to doing function minimization if you google. In fact, if you 
> google for "python function minimization" you should find about 63,000 
> links.

Hi Steven,

Right you are (63,700!) ... I don't know what search string I used
before, but clearly not this rather obvious one .. duh.


> Minimizing functions of two variables is difficult, as a general rule. 
> Nevertheless, there are tools for doing so. Check out SciPy.

I will - thanks. I have tools for 1D, I mostly am interested in 2D
optimization at this point, mostly as a way to verifying some results
I am calculating.

Hopefully SciPy will provide a nice simple interface to help me do
this.

Thanks,
Esmail



From stefaan.himpe at gmail.com  Sat May 23 10:16:54 2009
From: stefaan.himpe at gmail.com (Stefaan Himpe)
Date: Sat, 23 May 2009 16:16:54 +0200
Subject: html ui + py background? any tut?
In-Reply-To: <mailman.614.1243064920.8015.python-list@python.org>
References: <mailman.614.1243064920.8015.python-list@python.org>
Message-ID: <qzTRl.6949$Bc.3306@newsfe29.ams2>

Perhaps you want to investigate
pyjamas[1] and pyjamas-desktop[2]

[1] http://pyjs.org/
[2] http://pyjd.sourceforge.net/

Best regards,
Stefaan.


From ebonak at hotmail.com  Sat May 23 10:20:15 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 23 May 2009 10:20:15 -0400
Subject: Python -> R?
Message-ID: <gv90n1$1h4$1@ger.gmane.org>

Hello!

Anyone using Python scripts and accessing some of R's functionality?
If so, what are you using? I have read about RPy, is that a good
solution? Are there others that can be recommended or are preferred?

I would prefer to code in Python instead of R :-)

Thanks,
Esmail



From stefaan.himpe at gmail.com  Sat May 23 10:23:06 2009
From: stefaan.himpe at gmail.com (Stefaan Himpe)
Date: Sat, 23 May 2009 16:23:06 +0200
Subject: html ui + py background? any tut?
In-Reply-To: <mailman.614.1243064920.8015.python-list@python.org>
References: <mailman.614.1243064920.8015.python-list@python.org>
Message-ID: <eFTRl.6962$Bc.6756@newsfe29.ams2>

Or maybe you are looking for something like nufox?
http://nufox.berlios.de/


From benjamin.kaplan at case.edu  Sat May 23 10:24:53 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 23 May 2009 10:24:53 -0400
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
	<77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>
Message-ID: <ec96e1390905230724r65fe59cbue1d0e68ca5dcdbdb@mail.gmail.com>

On Sat, May 23, 2009 at 9:13 AM, Vincent Davis <vincent at vincentdavis.net>wrote:

> let me add that I see that this could be right if x.counter = 1 and
> counter need not have anything to do with MyClass but this could be more
> clear.
> Thanks
> Vincent Davis
> 720-301-3003
>
>
> On Sat, May 23, 2009 at 7:08 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>
>> Section 9.3.3 says that given,
>> class MyClass:
>>     """A simple example class"""
>>     i = 12345
>>     def f(self):
>>         return 'hello world'
>>
>> and x = MyClass()
>> then this
>>
>> x.counter = 1
>> while x.counter < 10:
>>     x.counter = x.counter * 2
>> print(x.counter)
>> del x.counter
>>
>> will print 16
>>
>> link,
>> http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes
>>
>> I am reading this section so to learn about classes but if this is right I
>> think I need to start over.
>>
>>
The code given is correct, though the description in the tutorial could be
clearer. Basically, a class in Python is represented by a dict with strings
mapping to other stuff. Internally, x.counter = 1 is just a shortcut for
x.__dict__['counter'] = 1. This appears in the code as dynamically adding
the variable "counter" to the instance of MyClass. Unlike in static
languages, an instance variable in python doesn't need to be declared inside
the class for you to use it. It also doesn't need to appear in every
instance of the class.

The last line in the code (del x.counter) removes the "counter" key from x
so that the instance variable disappears. That's how the code works "without
leaving a trace".




>
>> Thanks
>> Vincent Davis
>> 720-301-3003
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From joelc at cognyx.com  Sat May 23 10:44:21 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sun, 24 May 2009 00:44:21 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <6ca8919e-2984-482b-b34c-8cde032ca456@o5g2000prh.googlegroups.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<6ca8919e-2984-482b-b34c-8cde032ca456@o5g2000prh.googlegroups.com>
Message-ID: <0227fec4$0$25479$c3e8da3@news.astraweb.com>

Carl Banks wrote:
> On May 23, 3:49 am, Joel Ross <jo... at cognyx.com> wrote:
>>      def progressbar(self, number, total,  char):
>>
>>          percentage = float(number*100)/total
>>          percentage = int(round(percentage))
>>          percentage = int(100 - percentage)
>>          self.f=sys.stdout
>>          if percentage > 0:
>>              char = char * percentage
>>              self.f.write(char)
>>              self.f.flush()            
>>              sleep(0.2)
> [snip]
>> So when it prints a progress at 50% it will print 50 (*) characters and
>> if the next progress is 51% it will print 51 (*) characters including
>> the last 50 (*) characters, so instead on ending up with 100 (*)
>> characters I end up with a shit load of them depending on how many lines
>> I pass to the progressbar() function.
> 
> Here's why: when you write "char = char * percentage", you are setting
> char to a string, so on the next iteration char is the string you
> printed last time.  Thus char grows factorially with iterations.  Not
> good.
> 
> Instead, change char to some other name so you don't ever overwrite
> it; char should always be just one character.
> 
>              bar = char * percentage
>              self.f.write(bar)
> 
> 
> Carl Banks


Still having the same problem if I pass it 1000 lines it will printout 
1000 asterisks when I say lines I mean the argument <number> for the 
progress() function. I only want to printout 100 asterisks no matter how 
many lines I pass to the progress() function, that's why I need the 
printout to overwrite the last printout instead of appending to the last 
printout. I know there must be a way to do it. I'll keep trying and 
eventually get it. Any ideas would be helpful

jross


From vincent at vincentdavis.net  Sat May 23 10:46:39 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sat, 23 May 2009 08:46:39 -0600
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <ec96e1390905230724r65fe59cbue1d0e68ca5dcdbdb@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
	<77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>
	<ec96e1390905230724r65fe59cbue1d0e68ca5dcdbdb@mail.gmail.com>
Message-ID: <77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>

Thank you that makes sense to me. Much more clear then the tutorial, I think
so anyway. If you are learning about classes that you kinda expect MyClass
to have counter in it. I might be nice to show that x.counter = 1 creates an
instance that would look like (is this correct?)

class MyClass:
    """A simple example class"""
    i = 12345
    counter = 1
    def f(self):
        return 'hello world'

Thanks again

Vincent Davis


On Sat, May 23, 2009 at 8:24 AM, Benjamin Kaplan
<benjamin.kaplan at case.edu>wrote:

>
>
> On Sat, May 23, 2009 at 9:13 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>
>> let me add that I see that this could be right if x.counter = 1 and
>> counter need not have anything to do with MyClass but this could be more
>> clear.
>> Thanks
>> Vincent Davis
>> 720-301-3003
>>
>>
>> On Sat, May 23, 2009 at 7:08 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>>
>>> Section 9.3.3 says that given,
>>> class MyClass:
>>>     """A simple example class"""
>>>     i = 12345
>>>     def f(self):
>>>         return 'hello world'
>>>
>>> and x = MyClass()
>>> then this
>>>
>>> x.counter = 1
>>> while x.counter < 10:
>>>     x.counter = x.counter * 2
>>> print(x.counter)
>>> del x.counter
>>>
>>> will print 16
>>>
>>> link,
>>> http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes
>>>
>>> I am reading this section so to learn about classes but if this is right
>>> I think I need to start over.
>>>
>>>
> The code given is correct, though the description in the tutorial could be
> clearer. Basically, a class in Python is represented by a dict with strings
> mapping to other stuff. Internally, x.counter = 1 is just a shortcut for
> x.__dict__['counter'] = 1. This appears in the code as dynamically adding
> the variable "counter" to the instance of MyClass. Unlike in static
> languages, an instance variable in python doesn't need to be declared inside
> the class for you to use it. It also doesn't need to appear in every
> instance of the class.
>
> The last line in the code (del x.counter) removes the "counter" key from x
> so that the instance variable disappears. That's how the code works "without
> leaving a trace".
>
>
>
>
>>
>>> Thanks
>>> Vincent Davis
>>> 720-301-3003
>>>
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From motoom at xs4all.nl  Sat May 23 11:04:52 2009
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Sat, 23 May 2009 17:04:52 +0200
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>	<77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>	<ec96e1390905230724r65fe59cbue1d0e68ca5dcdbdb@mail.gmail.com>
	<77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>
Message-ID: <4A181094.40007@xs4all.nl>


Vincent writes:

 > you kinda expect MyClass to have counter in it.

Yeah, that makes sense. These instance variables are often initialized 
in the __init__ method:


class Counter(object):
     def __init__(self,initialvalue):
         self.value=initialvalue
     def inc(self):
         self.value+=1
     def dec(self):
         self.value-=1

beans=Counter(123)
beans.inc()
beans.inc()
beans.dec()
print beans.value

# the output of the program is: 124

Greetings,


-- 
"The ability of the OSS process to collect and harness
the collective IQ of thousands of individuals across
the Internet is simply amazing." - Vinod Valloppillil
http://www.catb.org/~esr/halloween/halloween4.html


From __peter__ at web.de  Sat May 23 11:12:10 2009
From: __peter__ at web.de (Peter Otten)
Date: Sat, 23 May 2009 17:12:10 +0200
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
Message-ID: <gv93nv$b6b$00$1@news.t-online.com>

Joel Ross wrote:

> class progress:
> 
>      def progressbar(self, number, total,  char):
> 
>          percentage = float(number*100)/total
>          percentage = int(round(percentage))
>          percentage = int(100 - percentage)
>          self.f=sys.stdout
>          if percentage > 0:
>              char = char * percentage

Carl probably overlooked that you didn't follow his advice. If you want to 
overwrite the current line you have to send a "\r" to the terminal. Change

>              self.f.write(char)

to
               self.f.write("\r" + char)

>              self.f.flush()
>              sleep(0.2)





From davea at ieee.org  Sat May 23 11:20:15 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 23 May 2009 11:20:15 -0400
Subject: Problems with sys.stout.flush()
In-Reply-To: <0033af48$0$9681$c3e8da3@news.astraweb.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
Message-ID: <4A18142F.2080403@ieee.org>

Joel Ross wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">Carl 
> Banks wrote:
>> On May 23, 2:20 am, Joel Ross <jo... at cognyx.com> wrote:
>>> Carl Banks wrote:
>>>> On May 22, 10:33 pm, Joel Ross <jo... at cognyx.com> wrote:
>>>>> Hi all,
>>>>> I'm using python 2.5 and trying to flush the sys.stout buffer with
>>>>> sys.stout.flush(), but doesn't seem to work. Each time a line is 
>>>>> printed
>>>>>    it appends the one before it I need to clear the output and 
>>>>> write a
>>>>> new output without appending the previous one.
>>>> That's not how streams work, chief.  Once you output (and flush)
>>>> something you can't un-output it.
>>>> What you probably want to do is to write a carriage return ("\r")
>>>> which usually causes the cursor to return to the beginning of the
>>>> line, so that any new text you write overwrites the old text.
>>>> This has nothing to do with flushing; flushing doesn't erase or clear
>>>> the old input.  Flushing is usually needed for a different reason,
>>>> however, namely standard output doesn't actually get sent to the
>>>> console until it sees a newline ("\n") unless you flush the buffer.
>>>> Try to adapt this example to your problem:
>>>> for i in xrange(11):
>>>>     sys.stdout.write('*'*(10-i) + ' '*i + '\r')
>>>>     sys.stdout.flush()
>>>>     time.sleep(2)
>>> Your example prints a new line each time,
>>
>> Did you run it and observe what happened, or did you just guess what
>> it actually did?  On my system it doesn't print new lines.
>>
>>
>>> Doesn't help me with a
>>> progress bar, do you know of anyway doing it with the print command? My
>>> progress bars works fine this is the only problem im having with it at
>>> the moment. any help would be appreciated.
>>
>> Well, based on the code you posted it doesn't look like your progress
>> bar is fine.
>>
>> Anyway, you haven't described the problem you are having very well,
>> and we can guess what might be wrong but if you want better help
>> you're going to have to describe your problem more coherently.  Give
>> us the
>>
>> 1. What code are you actually running (cut-and-paste, please, don't
>> retype).
>> 2. What do you expect the code to output (type in actual output you
>> expect to see, not merely a description).
>> 3. What does the code actually output when you run it (cut-and paste,
>> please, don't just describe).
>> 4. Include any tracebacks if there are any.
>>
>> In the meantime, I repeat my suggestion that you take my example and
>> adapt it to what you are doing.
>>
>> One other note: the print statement is unsuitable for this task
>> because it always prints a trailing whitespace.  Use sys.stdout.write
>> for it.
>>
>>
>> Carl Banks
> Hey,
>
> The only reason I didn't supply full details is because I thought it 
> may just be something simple I was missing. Sorry for the confusing. 
> Well here's the full code.
>
> import sys, os
> from time import sleep
>
>
> class progress:
>
>     def progressbar(self, number, total,  char):
>
>         percentage = float(number*100)/total
>         percentage = int(round(percentage))
>         percentage = int(100 - percentage)
>         self.f=sys.stdout
>         if percentage > 0:
>             char = char * percentage
>             self.f.write(char)
>             self.f.flush()         
>             sleep(0.2)
>
>
>     def countlines(self, file):
>
>         lineCount = 0
>         f = open(file)
>         it = iter(f)
>         try:
>             while it.next():
>                 lineCount += 1
>         except StopIteration:
>                     pass
>         return lineCount
>
>
> def main():
>
>     p = progress()
>     lines = 5
>     #lines = p.countlines("/tmp/junk")
>     count = lines
>     for i in xrange(lines):
>         p.progressbar(count, lines, "*")
>         count -=1
>     print "Finished"
>
> if __name__ == "__main__":
>         main()
>
> For now we can ignore the countlines() function. I need a nice 
> progress display e.g. ********************** continuing on til it 
> reaches 100% I need this to print out on one line only. At the moment 
> it does do this, only problem is its appends the print out from the 
> last print out. I need it to clear the last print out and then print 
> the new print out without appending the last.
>
> So when it prints a progress at 50% it will print 50 (*) characters 
> and if the next progress is 51% it will print 51 (*) characters 
> including the last 50 (*) characters, so instead on ending up with 100 
> (*) characters I end up with a shit load of them depending on how many 
> lines I pass to the progressbar() function.
>
> Needed Output:
> ***************************************************************************************************Finished 
>
>
>
> Current Output:
> ********************************************************************************************************************************************************************************************************Finished 
>
>
> Note: As you can see I'm only sending 5 lines to the progressbar() 
> function and It prints this many characters, so you could imagine if I 
> have 10000 lines I would end up with a heap of * characters.
>
> Regards
> jross
>
>
You don't tell your environment.  Like, what version of Python, and more 
importantly what operating system?  You also don't say how you're 
testing the system, nor where it's intended to finally run.

There is no portable way to say "erase those charcters I sent earlier, I 
didn't mean it."  flush() does nothing even close to that.

In a standard console (at least on Windows), adding a simple \r   (*NOT* 
\n) would work easily, as Carl Banks already suggested.  However, in 
some shells (I test with Komodo), it does not.

So, you have a couple of choices, depending on your environment.  The 
simplest is to do a cursor-position operation, specific to your 
particular output "device."  Nobody can reliably help you with that 
without knowing what the environment is.

More complex for a forward-moving progress bar is to simply keep track 
of how many stars have already been output, and only add the additional 
ones you want.  in your current incarnation, the percentage value shows 
20, then 40, then 60, then 80  (it never reaches 100, but maybe that's 
okay).  Currently you're printing all those stars over again.  This 
solution would be to print only the difference, or 20 more stars each time.

A way to accomplish that would be to create a counter in the progress 
class, that knows how many stars have already been output.  Something like:

class progress:

    def __init__(self):
        self.already = 0              #number of stars already displayed

    def progressbar(self, number, total,  char):

        percentage = float(number*100)/total
        percentage = int(round(percentage))
        percentage = int(100 - percentage)
        self.f=sys.stdout
        if percentage > 0:
            char = char * (percentage-self.already)
            self.already = percentage
            self.f.write(char + "X")    #note:  remove the "X" when 
you're sure it's working
            self.f.flush()
            sleep(0.2)

Clearly the self.write() function should change to simply    
self.write(char)  when you're confident it's working.  For now, it gives 
you a marker to see how it's being pieced together.

Incidentally, Carl's other suggestion, that you use a new variable 
instead of overwriting 'char', is a red herring.  It's good advice to 
never change your parameters in place, and for mutable data types, could 
be a problem.  But because char is a string, this is not your problem.




From seattlehanks at yahoo.com  Sat May 23 11:32:24 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sat, 23 May 2009 08:32:24 -0700 (PDT)
Subject: from __future__ import absolute_import issue
References: <1aeb486c-eef8-453c-8d04-fd831a84f8e2@g22g2000pra.googlegroups.com>
	<mailman.562.1242978117.8015.python-list@python.org>
Message-ID: <5d6c964f-8973-4aef-9b86-fa8b3f6855d7@f37g2000pro.googlegroups.com>

On May 22, 12:42?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 20 May 2009 20:18:02 -0300, LittleGrasshopper ?
> <seattleha... at yahoo.com> escribi?:
>
> > New to the group, this is my first post...
>
> > It appears that either absolute imports (or my brain) aren't working.
> > Given a module string.py which is in the same directory as a.py:
>
> > #File a.py
> > from __future__ import absolute_import
>
> > import string
>
> > print string # Module imported is string.py in current directory, not
> > standard library module
>
> absolute_import helps with imports inside a package (those are "relative" ?
> imports, relative to the package). If a module is located in a directory ?
> listed in sys.path, an absolute import will find it. I don't think there ?
> is a way to avoid shadowing a standard module (other than ensuring the ?
> standard directories come first in sys.path).
>
> --
> Gabriel Genellina

You are right. If you have a directory in your PYTHONPATH before the
standard library directories that has a string module, for example,
absolute_import will not help you. I was getting confused by the fact
that when I print sys.path from the python shell, the first entry is
an empty string.
This empty string must denote the current directory though, because:

['', '/usr/lib/python25.zip', '/usr/lib/python2.5', '/usr/lib/
python2.5/plat-linux2', '/usr/lib/python2.5/lib-tk', '/usr/lib/
python2.5/lib-dynload', '/usr/local/lib/python2.5/site-packages', '/
usr/lib/python2.5/site-packages', '/usr/lib/python2.5/site-packages/
Numeric', '/usr/lib/python2.5/site-packages/PIL', '/usr/lib/python2.5/
site-packages/gst-0.10', '/var/lib/python-support/python2.5', '/usr/
lib/python2.5/site-packages/gtk-2.0', '/var/lib/python-support/
python2.5/gtk-2.0']

When I have this sys.path, doing an "import string" from a module
where I have absolute imports enabled will still import the string
module in the package (which also means it is in the same directory in
this case.) So I think my string.py is being imported not because it
is in the same package, but because the home directory is searched
first. The empty string doesn't make much sense though (at least in a
Unix system, you would imagine it would be something like './') but I
guess that synce Python is platform independent, the empty string is
taken to denote the current directory.

Thanks for your help.


From benjamin.kaplan at case.edu  Sat May 23 11:35:48 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 23 May 2009 11:35:48 -0400
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
	<77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>
	<ec96e1390905230724r65fe59cbue1d0e68ca5dcdbdb@mail.gmail.com>
	<77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>
Message-ID: <ec96e1390905230835y7f830905g5857fab417ce0440@mail.gmail.com>

On Sat, May 23, 2009 at 10:46 AM, Vincent Davis <vincent at vincentdavis.net>wrote:

> Thank you that makes sense to me. Much more clear then the tutorial, I
> think so anyway. If you are learning about classes that you kinda expect
> MyClass to have counter in it. I might be nice to show that x.counter = 1
> creates an instance that would look like (is this correct?)
>
> class MyClass:
>     """A simple example class"""
>     i = 12345
>     counter = 1
>     def f(self):
>         return 'hello world'
>

That's how it would work in almost any language other than Python. In
Python, anything declared in that scope is a member of the class. For
something immutable like an int, it doesn't matter. If you can change it
however, you get problems. This is one of the biggest sources of problems
for python beginners (you get the same behavior with default method
arguments btw)

>>> class Foo :
...    lst = []
...
>>> a = Foo()
>>> b = Foo()
>>> b.lst
[]
>>> a.lst.append(1)
>>> b.lst
[1]



In Python, if you want something to be a part of the instance, you have to
add it to the instance. That's what the "self" parameter in the method
argument list is. x.f() is just syntax sugar for MyClass.f(x). Dynamically
adding variables can get very confusing, so people usually declare
everything (or almost everything) they're going to use in the __init__
method discussed in section 9.3.2.


>
>

> Thanks again


> Vincent Davis
>
>
>
> On Sat, May 23, 2009 at 8:24 AM, Benjamin Kaplan <benjamin.kaplan at case.edu
> > wrote:
>
>>
>>
>> On Sat, May 23, 2009 at 9:13 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>>
>>> let me add that I see that this could be right if x.counter = 1 and
>>> counter need not have anything to do with MyClass but this could be more
>>> clear.
>>> Thanks
>>> Vincent Davis
>>> 720-301-3003
>>>
>>>
>>> On Sat, May 23, 2009 at 7:08 AM, Vincent Davis <vincent at vincentdavis.net
>>> > wrote:
>>>
>>>> Section 9.3.3 says that given,
>>>> class MyClass:
>>>>     """A simple example class"""
>>>>     i = 12345
>>>>     def f(self):
>>>>         return 'hello world'
>>>>
>>>> and x = MyClass()
>>>> then this
>>>>
>>>> x.counter = 1
>>>> while x.counter < 10:
>>>>     x.counter = x.counter * 2
>>>> print(x.counter)
>>>> del x.counter
>>>>
>>>> will print 16
>>>>
>>>> link,
>>>> http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes
>>>>
>>>> I am reading this section so to learn about classes but if this is right
>>>> I think I need to start over.
>>>>
>>>>
>> The code given is correct, though the description in the tutorial could be
>> clearer. Basically, a class in Python is represented by a dict with strings
>> mapping to other stuff. Internally, x.counter = 1 is just a shortcut for
>> x.__dict__['counter'] = 1. This appears in the code as dynamically adding
>> the variable "counter" to the instance of MyClass. Unlike in static
>> languages, an instance variable in python doesn't need to be declared inside
>> the class for you to use it. It also doesn't need to appear in every
>> instance of the class.
>>
>> The last line in the code (del x.counter) removes the "counter" key from x
>> so that the instance variable disappears. That's how the code works "without
>> leaving a trace".
>>
>>
>>
>>
>>>
>>>> Thanks
>>>> Vincent Davis
>>>> 720-301-3003
>>>>
>>>
>>>
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From steve at REMOVE-THIS-cybersource.com.au  Sat May 23 11:47:41 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 23 May 2009 15:47:41 GMT
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<6ca8919e-2984-482b-b34c-8cde032ca456@o5g2000prh.googlegroups.com>
	<0227fec4$0$25479$c3e8da3@news.astraweb.com>
Message-ID: <0033f50b$0$9725$c3e8da3@news.astraweb.com>

On Sun, 24 May 2009 00:44:21 +1000, Joel Ross wrote:

> Still having the same problem if I pass it 1000 lines it will printout
> 1000 asterisks when I say lines I mean the argument <number> for the
> progress() function. I only want to printout 100 asterisks no matter how
> many lines I pass to the progress() function, that's why I need the
> printout to overwrite the last printout instead of appending to the last
> printout. 

No, you're confusing two different problems:

(1) Scale the width of the progress bar to 100 characters;

(2) Make the progress bar appear on one line instead of multiple lines.


To solve the *second* problem, use the hint already given by Carl Banks.

To solve the *first* problem, use mathematics, then re-do your method, 
because your method is wrong. Before you can write code to solve this 
problem, you first have to get the mathematics right: you want to scale 
the width of the progress bar to be 100 asterisks no matter how many 
lines you have.

(a) If you have exactly 100 lines, and you draw one asterisk per line, 
then you get a progress bar of exactly 100 asterisks.

(b) If you have 50 lines, and you want a progress bar of exactly 100 
asterisks, you need to draw *two* asterisks per line.

(c) If you have 200 lines, and you want a progress bar of exactly 100 
asterisks, you need to draw *one half* an asterisk per line (or one 
asterisk per *two* lines).

(d) If you have N lines, and you want a progress bar of exactly 100 
asterisks, each line must be equivalent to [____] asterisks.

Once you have filled in the blank, then go back to writing code.


Some further hints: I've added some commentary to your code:

def progressbar(self, number, total,  char):
    percentage = float(number*100)/total
    percentage = int(round(percentage))
    percentage = int(100 - percentage)
    # Why not combine all of the above into one line?
    # percentage = int(100 - round(number*100.0/total))

    self.f=sys.stdout
    # Why are you storing stdout as an attribute to the method? Unless 
    # you will need it again elsewhere, this is a waste.

    if percentage > 0:
        char = char * percentage
        # Carl Banks has already pointed out the problem here.

        self.f.write(char)
        self.f.flush()
        # Better written like this:
        # sys.stdout.write(char)
        # sys.stdout.flush()

        sleep(0.2)


Finally, here's a function that should do what you ask for:

from __future__ import division
import sys

def progressbar(number, total, char='*', maxwidth=100):
    done = number/total
    if not 0 <= done <= 1:
        raise ValueError('number or total out of range')
    # Scale done=1 => maxwidth chars.
    s = int(done*maxwidth)*char
    sys.stdout.write(s + '\r')
    sys.stdout.flush()
    sleep(0.2)

This should work in "normal" terminal windows (tested on Linux, should 
work on Windows and Mac too) but some IDEs may mess it up.




-- 
Steven


From davea at ieee.org  Sat May 23 12:48:05 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 23 May 2009 12:48:05 -0400
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>
Message-ID: <4A1828C5.4050603@ieee.org>

Vincent Davis wrote:
> Section 9.3.3 says that given,
> class MyClass:
>     """A simple example class"""
>     i = 12345
>     def f(self):
>         return 'hello world'
>
> and x = MyClass()
> then this
>
> x.counter = 1
> while x.counter < 10:
>     x.counter = x.counter * 2
> print(x.counter)
> del x.counter
>
> will print 16
>
> link,
> http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes
>
> I am reading this section so to learn about classes but if this is right I
> think I need to start over.
>
>
> Thanks
> Vincent Davis
> 720-301-3003
>
>   
Yes, this code will display 16, and it's not specific to 3.0, but works 
in earlier Pythons as well.

I'm not sure why you're puzzled;  it could be the question of why 16, 
but i suspect it's because you can't see who creates this x attribute.

Unlike languages like Java and C++, object attributes are not fixed at 
the time the class is compiled.  Some attributes are created by the 
placement of the code, for example the method name f.  But others are 
created in the code of the class (typically the __init__() method), and 
others can be created by anyone, at any time.

I don't know why the tutorial starts with this, but it illustrates that 
an object is really just a container for attributes, some of which are 
callable (methods), and some of which are data (what Java would call 
fields).  Anybody with an object reference can create, modify or delete 
those attributes.  If it's being done inside the class methods, you use 
the syntax  self.counter.  But it also works outside, as you see.


From joelc at cognyx.com  Sat May 23 13:19:11 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sun, 24 May 2009 03:19:11 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <0033af48$0$9681$c3e8da3@news.astraweb.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
Message-ID: <02282310$0$20616$c3e8da3@news.astraweb.com>

Thanks for all the help guys. I got it to work correctly with this

class progress:

     def __init__(self):
        self.already = 0

     def progressbar(self, number, total,  char):

        percentage = int(100 - round(number*100.0/total))
        if percentage > 0:
            xchar = char * (percentage-self.already)
            self.already = percentage
            sys.stdout.write(xchar)
            sys.stdout.flush()
            sleep(1)

Keeping track of the characters that had already been printed solved my 
main problem thanks Dave and everyone else for helping me out with this 
issue. Now I can move onto next one.

jross


From davea at ieee.org  Sat May 23 13:48:46 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 23 May 2009 13:48:46 -0400
Subject: error in tutorial for 3.0, section 9.3.3
In-Reply-To: <77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>
References: <77e831100905230608m162bd9ccw6ccd2f413916a0bb@mail.gmail.com>	<77e831100905230613p265a01c2sd6c7d52d6c1ee46a@mail.gmail.com>	<ec96e1390905230724r65fe59cbue1d0e68ca5dcdbdb@mail.gmail.com>
	<77e831100905230746k5baa5a75o2b719dc45e75ef09@mail.gmail.com>
Message-ID: <4A1836FE.3000504@ieee.org>

Vincent Davis wrote:
> Thank you that makes sense to me. Much more clear then the tutorial, I think
> so anyway. If you are learning about classes that you kinda expect MyClass
> to have counter in it. I might be nice to show that x.counter = 1 creates an
> instance that would look like (is this correct?)
>
> class MyClass:
>     """A simple example class"""
>     i = 12345
>     counter = 1
>     def f(self):
>         return 'hello world'
>
> Thanks again
>
> Vincent Davis
>
>
> On Sat, May 23, 2009 at 8:24 AM, Benjamin Kaplan
> <benjamin.kaplan at case.edu>wrote:
>
>   
>> On Sat, May 23, 2009 at 9:13 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>>
>>     
>>> let me add that I see that this could be right if x.counter = 1 and
>>> counter need not have anything to do with MyClass but this could be more
>>> clear.
>>> Thanks
>>> Vincent Davis
>>> 720-301-3003
>>>
>>>
>>> On Sat, May 23, 2009 at 7:08 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>>>
>>>       
>>>> Section 9.3.3 says that given,
>>>> class MyClass:
>>>>     """A simple example class"""
>>>>     i = 12345
>>>>     def f(self):
>>>>         return 'hello world'
>>>>
>>>> and x = MyClass()
>>>> then this
>>>>
>>>> x.counter = 1
>>>> while x.counter < 10:
>>>>     x.counter = x.counter * 2
>>>> print(x.counter)
>>>> del x.counter
>>>>
>>>> will print 16
>>>>
>>>> link,
>>>> http://docs.python.org/3.0/tutorial/classes.html#a-first-look-at-classes
>>>>
>>>> I am reading this section so to learn about classes but if this is right
>>>> I think I need to start over.
>>>>
>>>>
>>>>         
>> The code given is correct, though the description in the tutorial could be
>> clearer. Basically, a class in Python is represented by a dict with strings
>> mapping to other stuff. Internally, x.counter = 1 is just a shortcut for
>> x.__dict__['counter'] = 1. This appears in the code as dynamically adding
>> the variable "counter" to the instance of MyClass. Unlike in static
>> languages, an instance variable in python doesn't need to be declared inside
>> the class for you to use it. It also doesn't need to appear in every
>> instance of the class.
>>
>> The last line in the code (del x.counter) removes the "counter" key from x
>> so that the instance variable disappears. That's how the code works "without
>> leaving a trace".
>>
>>
>>
>>
>>     
>>>> Thanks
>>>> Vincent Davis
>>>> 720-301-3003
>>>>
>>>>         
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>>>
>>>       
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>>     
(You accidentally top-posted.  That makes the context much harder for 
others to follow.)

No, the attribute 'counter' you demonstrated is an attribute of the 
class.  To duplicate what  x.counter=1 does, you have to add it to the 
instance.  Normally, this would be done in the __init__() method, but 
that would put it in each instance of the class, as it's being created.  
But this one is only in the 'x' instance.




From cooldudevamsee at gmail.com  Sat May 23 14:31:48 2009
From: cooldudevamsee at gmail.com (samba)
Date: Sat, 23 May 2009 11:31:48 -0700 (PDT)
Subject: How to pass multiline flag to re.sub without using re.complie.
Message-ID: <5830da28-b9db-49cc-bacc-6488fc1ede18@a5g2000pre.googlegroups.com>

I have a regex that needs multiline flag. Some where I read I can pass
multiline flag in regex string itself without using re.compile. If
anybody have any idea about how to do that please reply.


From daywednes at gmail.com  Sat May 23 14:55:02 2009
From: daywednes at gmail.com (Minh Doan)
Date: Sat, 23 May 2009 11:55:02 -0700
Subject: need a help!
Message-ID: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>

Hi,

I'm a newbie to python. I am having stuck with the following problem. I want
to download the info(price) from fromcity to tocity at a certain time from
kayak.com website. If we do it manually, we can go to the website, choose
the appropriate info we want to get and press SEARCH. How can i do it in
python ?

I hope someone could help me deal with the problem.
Thanks
----
Minh Doan
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From kushal.kumaran at gmail.com  Sat May 23 15:17:02 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Sun, 24 May 2009 00:47:02 +0530
Subject: need a help!
In-Reply-To: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>
References: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>
Message-ID: <1e364c4e0905231217n3e294ccai1fdd4de5fbe18d2d@mail.gmail.com>

On Sun, May 24, 2009 at 12:25 AM, Minh Doan <daywednes at gmail.com> wrote:
> Hi,
>
> I'm a newbie to python. I am having stuck with the following problem. I want
> to download the info(price) from fromcity to tocity at a certain time from
> kayak.com website. If we do it manually, we can go to the website, choose
> the appropriate info we want to get and press SEARCH. How can i do it in
> python ?
>

You can automate interaction with web pages using the mechanize
library.  See http://wwwsearch.sourceforge.net/mechanize/

Or you can examine what data gets sent to the web server when you
click SEARCH, and send that data using the urllib2 module in the
standard library.  The library documentation has examples.

-- 
kushal


From ebonak at hotmail.com  Sat May 23 15:25:47 2009
From: ebonak at hotmail.com (Esmail)
Date: Sat, 23 May 2009 15:25:47 -0400
Subject: need a help!
In-Reply-To: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>
References: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>
Message-ID: <4A184DBB.2090407@hotmail.com>

Minh Doan wrote:
> Hi,
> 
> I'm a newbie to python. I am having stuck with the following problem. I 
> want to download the info(price) from fromcity to tocity at a certain 
> time from kayak.com <http://kayak.com/> website. If we do it manually, 
> we can go to the website, choose the appropriate info we want to get and 
> press SEARCH. How can i do it in python ?
> 
> I hope someone could help me deal with the problem.
> Thanks
> ----
> Minh Doan
> 

For Kayak, see this page:

      http://www.kayak.com/labs/gateway/doc/air.vtl

and here's a sample query for 2 flights

#!/usr/bin/env python

#
# search for 2 flights on Kayak.com
#

import webbrowser

url1='http://www.kayak.com/s/search/air?l1=cid&d1=4/23/2009&l2=yyz&d2=4/26/2009'
url2='http://www.kayak.com/s/search/air?l1=cid&d1=6/22/2009&l2=fra&d2=3/17/2009'

webbrowser.open_new_tab(url1);
webbrowser.open_new_tab(url2);



From pavlovevidence at gmail.com  Sat May 23 16:12:55 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 23 May 2009 13:12:55 -0700 (PDT)
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<mailman.627.1243092031.8015.python-list@python.org>
Message-ID: <ddea5acf-29ed-49f0-a9dc-2f1e5ccc343f@d2g2000pra.googlegroups.com>

On May 23, 8:20?am, Dave Angel <da... at ieee.org> wrote:
> Incidentally, Carl's other suggestion, that you use a new variable
> instead of overwriting 'char', is a red herring.

Yeah, I dropped the ball on this one, I misread his code as being in a
loop instead of being called repeatedly.  And after criticizing him
for not running mine....

Sorry bout that.


Carl Banks


From davea at ieee.org  Sat May 23 16:19:34 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 23 May 2009 16:19:34 -0400
Subject: need a help!
In-Reply-To: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>
References: <9c76a0930905231155l1d3402f4ub26a6883ad9c3ec0@mail.gmail.com>
Message-ID: <4A185A56.8040500@ieee.org>

Minh Doan wrote:
> Hi,
>
> I'm a newbie to python. I am having stuck with the following problem. I want
> to download the info(price) from fromcity to tocity at a certain time from
> kayak.com website. If we do it manually, we can go to the website, choose
> the appropriate info we want to get and press SEARCH. How can i do it in
> python ?
>
> I hope someone could help me deal with the problem.
> Thanks
> ----
> Minh Doan
>
>   
I'd start by researching the following two links.

http://www.kayak.com/labs/
http://www.programmableweb.com/api/kayak

You'll need to register with them to get an affiliate id, but this 
should get you started.



From python.list at tim.thechases.com  Sat May 23 16:20:31 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Sat, 23 May 2009 15:20:31 -0500
Subject: How to pass multiline flag to re.sub without using re.complie.
In-Reply-To: <5830da28-b9db-49cc-bacc-6488fc1ede18@a5g2000pre.googlegroups.com>
References: <5830da28-b9db-49cc-bacc-6488fc1ede18@a5g2000pre.googlegroups.com>
Message-ID: <4A185A8F.9040304@tim.thechases.com>

> I have a regex that needs multiline flag. Some where I read I
> can pass multiline flag in regex string itself without using
> re.compile. If anybody have any idea about how to do that
> please reply.


As detailed at [1],

"""
(?iLmsux)

(One or more letters from the set 'i', 'L', 'm', 's', 'u', 'x'.) 
The group matches the empty string; the letters set the 
corresponding flags: re.I (ignore case), re.L (locale dependent), 
re.M (multi-line), re.S (dot matches all), re.U (Unicode 
dependent), and re.X (verbose), for the entire regular 
expression. (The flags are described in Module Contents.) This is 
useful if you wish to include the flags as part of the regular 
expression, instead of passing a flag argument to the compile() 
function.
"""

So you should be able to insert "(?m)" at the beginning of your 
regexp to make it multiline.

-tkc


[1]
http://docs.python.org/library/re.html






From google at mrabarnett.plus.com  Sat May 23 16:45:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 23 May 2009 21:45:59 +0100
Subject: How to pass multiline flag to re.sub without using re.complie.
In-Reply-To: <5830da28-b9db-49cc-bacc-6488fc1ede18@a5g2000pre.googlegroups.com>
References: <5830da28-b9db-49cc-bacc-6488fc1ede18@a5g2000pre.googlegroups.com>
Message-ID: <4A186087.6090301@mrabarnett.plus.com>

samba wrote:
> I have a regex that needs multiline flag. Some where I read I can pass
> multiline flag in regex string itself without using re.compile. If
> anybody have any idea about how to do that please reply.

Include "(?m)" in the regular expression for multiline matching. It's 
best to put it at the start.


From walterbyrd at iname.com  Sat May 23 17:05:10 2009
From: walterbyrd at iname.com (walterbyrd)
Date: Sat, 23 May 2009 14:05:10 -0700 (PDT)
Subject: When does the escape character work within raw strings?
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
	<mailman.600.1243016575.8015.python-list@python.org>
Message-ID: <99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>

On May 22, 12:22?pm, "Rhodri James"
> How do you know how a string object is going to be treated by any
> given function? ?Read the Fine Manual for that function.

So am I to understand that there is no consistency in string handling
throughout the standard modules/objects/methods?

Seems to make python a lot more complicated than it needs to be, but
okay.



From robert.kern at gmail.com  Sat May 23 17:21:46 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 23 May 2009 16:21:46 -0500
Subject: Optimizing math functions
In-Reply-To: <gv8tbl$ph3$1@ger.gmane.org>
References: <gv8tbl$ph3$1@ger.gmane.org>
Message-ID: <gv9pda$t3s$1@ger.gmane.org>

On 2009-05-23 08:22, Esmail wrote:
> Hello all,
>
> I would like to maximize or minimize a given math function over a
> specific set of values, in Python preferably.
>
> I was checking out Wolfram Alpha (http://www70.wolframalpha.com/)
> and it can do simple optimization problems in math, such as
>
> maximize 15*x - x**2 over 0 to 15
>
> (http://www70.wolframalpha.com/input/?i=maximize+15*x+-+x**2+over+0+to+15)
>
> which finds the maximum value and input for x in the range 0 to 15.
> Very cool. (This is of course a very simple example).
>
> What it apparently can't do is for maximize (or minimize) functions
> that contain two variables, x and y, or more. So for example a simple
> example would be
>
> maximize x**2 + y**2 over x:0 to 15, y:0-12 -- this does not work
> -- though I'm unclear about
> -- the correct syntax too.
>
> Is there some sort of simple Python module that would allow me to
> evaluate this type of function?
>
> In this particular instance I am interested in the minimum of
>
> x * sin(4*x) + 1.1 * sin(2*y), where x,y in range 0-10
>
> though in other problems the range may not be identical for x and y.

We have several bounded optimization routines in scipy.

http://docs.scipy.org/doc/scipy/reference/optimize.html

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Sat May 23 17:29:23 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 23 May 2009 16:29:23 -0500
Subject: When does the escape character work within raw strings?
In-Reply-To: <99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>	<mailman.459.1242842772.8015.python-list@python.org>	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>	<mailman.554.1242963859.8015.python-list@python.org>	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>	<mailman.600.1243016575.8015.python-list@python.org>
	<99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
Message-ID: <gv9prj$uhm$1@ger.gmane.org>

On 2009-05-23 16:05, walterbyrd wrote:
> On May 22, 12:22 pm, "Rhodri James"
>> How do you know how a string object is going to be treated by any
>> given function?  Read the Fine Manual for that function.
>
> So am I to understand that there is no consistency in string handling
> throughout the standard modules/objects/methods?
>
> Seems to make python a lot more complicated than it needs to be, but
> okay.

*Any* language would have such issues. Different functions do different things 
to its inputs. That's why you have different functions. I certainly wouldn't 
want my HTML parser to treat its inputs as if they were regular expressions.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From bottleh20 at gmail.com  Sat May 23 17:32:57 2009
From: bottleh20 at gmail.com (Water Bottle)
Date: Sat, 23 May 2009 17:32:57 -0400
Subject: Problems with StaticBitmaps and events
Message-ID: <c8a21b110905231432q175a3ebay8111f4cf37dc4977@mail.gmail.com>

Hi, I'm new to wxpython and I created a test program. So far, it works, but
there are some problems with it.

For some reason, I get a small box in the top left corner. Not sure why
that's happening.

Also, I can't get my picture to bind to my Play().

Lastly, do you recommend using StaticBitmap as a button? I don't want to use
the wx.Button because I want to create my own custom buttons with its own
borders and such.



I've attached my png.





import wx

class Frame(wx.Frame):
    def __init__(self, parent, ID, title):
        wx.Frame.__init__(self, parent, ID, title, wx.DefaultPosition,
wx.Size(400,400))

        self.sizer=wx.BoxSizer(wx.VERTICAL)
        self.sizer.Add(Box(self,-1).sizer,1,wx.EXPAND)
        self.sizer.Add(Picture(self,-1).sizer,0,wx.EXPAND)

        self.SetSizer(self.sizer)
        self.SetAutoLayout(1)
        self.Show(1)

class Picture(wx.Panel):
    def __init__(self, parent, ID):
        wx.Panel.__init__(self, parent, ID)

        bitmap =
wx.Bitmap("/home/kevin/programming/python/media/data/arrow_blue.png",
wx.BITMAP_TYPE_PNG)
        self.pic = wx.StaticBitmap(parent, ID, bitmap, wx.Point(30,120),
wx.Size(20,20), 0, "Name")

        self.pic.Bind(wx.EVT_BUTTON, self.Play)

        # Add more pictures later

        # Layout
        self.sizer = wx.GridSizer(1,10,0,0)
        self.sizer.AddMany([(self.pic,1,wx.EXPAND),
                ])

    def Play(self, event):
        print "Hello"


class Box(wx.Panel):
    def __init__(self, parent, ID):
        wx.Panel.__init__(self, parent, ID)
        self.control = wx.TextCtrl(parent, 1, style=wx.TE_MULTILINE)

        # Layout
        self.sizer = wx.BoxSizer(wx.HORIZONTAL)
        self.sizer.Add(self.control, 1, wx.EXPAND)


class myApp(wx.App):
    def OnInit(self):
        frame = Frame(None, -1, "Test")
        frame.Show()
        self.SetTopWindow(frame)
        return 1

app = myApp(0)
app.MainLoop()



Thanks!
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From rhodri at wildebst.demon.co.uk  Sat May 23 17:59:47 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 23 May 2009 22:59:47 +0100
Subject: Abstract Classes
In-Reply-To: <e31135b4-fc06-4b8c-be15-7872bc81eb1d@g37g2000yqn.googlegroups.com>
References: <e31135b4-fc06-4b8c-be15-7872bc81eb1d@g37g2000yqn.googlegroups.com>
Message-ID: <op.uuekpxm3a8ncjz@gnudebst>

On Sat, 23 May 2009 12:02:00 +0100, Tim Cook <timothywayne.cook at gmail.com>  
wrote:

> I am implementing a set of specifications that were designed to be OO
> language neutral.
>
> Several classes are specified as being abstract; so therefore there
> should be no instances of them, correct?
>
> However in the classes that are subclasses what is the correct way in
> Python to implement them?

That very much depends on the classes, and how much the abstract classes
do.  With the very simple examples you give which have no methods even,
I'd be strongly tempted not to implement the classes at all.  But let's
assume that's not a good idea (and there are plenty of reasons for it
not to be a good idea, to be fair).

Caution: I am not in the slightest bit familiar with the zope.interface
module, which does make your IA and IB classes look exceptionally
pointless.  Again, it's fairly safe to presume that I'm wrong there :-)

> I am using the zope.interface module as well.
>
> For example:
>
> class IA(Interface):
>    m = Int()
>    p = TextLine()
>
> class IB(Interface):
>
>    x = Bool()
>    s = Text()
>
>
>
> class A(object):
> """ This is an abstract class with attributes m is an int and p is a
> string"""
>
>    implements(IA)
>    pass
>
> class B(A):
>   implements(IB)
>
>   def __init__(self,m,p,x,s):
>     m=m
>     p=p
>     x=x
>     s=s

Presumably you mean
     self.m = m
     self.p = p
and so on?

This doesn't seem to be a consistent approach.  Class B enforces
initialisation of all its attributes, including the inherited ones,
but class A doesn't.

> or should it be like:
>
> class A(object):
> """ This is an abstract class with attributes m is an int and p is a
> string"""
>
>    implements(IA)
>
>    def __init__(self,m,p):
>      m=m
>      p=p
>
>
> class B(A):
>   implements(IB)
>
>   def __init__(self,m,p,x,s):
>     A.__init__(m,p)
>     x=x
>     s=s

Modulo the "self." as before, this is more consistent.

> or maybe even:
>
> class B(A):
>   implements(IB)
>
>   def __init__(self,m,p,x,s):
>     super(A.__init__(m,p))
>     x=x
>     s=s

I have a bit of an allergy to super() because it works in slightly
unexpected ways.  Here in particular it doesn't gain you anything
and may cost you instead.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Sat May 23 18:23:11 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 23 May 2009 23:23:11 +0100
Subject: Problems with sys.stout.flush()
In-Reply-To: <02282310$0$20616$c3e8da3@news.astraweb.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<02282310$0$20616$c3e8da3@news.astraweb.com>
Message-ID: <op.uuelsxwsa8ncjz@gnudebst>

On Sat, 23 May 2009 18:19:11 +0100, Joel Ross <joelc at cognyx.com> wrote:

> Now I can move onto next one.

Except that you still have the interesting issue that your environment
isn't responding to '\r' correctly, which worries me rather.  Or did
you never test that?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Sat May 23 18:34:15 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 23 May 2009 23:34:15 +0100
Subject: When does the escape character work within raw strings?
In-Reply-To: <99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
	<mailman.600.1243016575.8015.python-list@python.org>
	<99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
Message-ID: <op.uuembd1xa8ncjz@gnudebst>

On Sat, 23 May 2009 22:05:10 +0100, walterbyrd <walterbyrd at iname.com>  
wrote:

> On May 22, 12:22?pm, "Rhodri James"
>> How do you know how a string object is going to be treated by any
>> given function? ?Read the Fine Manual for that function.
>
> So am I to understand that there is no consistency in string handling
> throughout the standard modules/objects/methods?

How can there be?  They all have different requirements, after all.
In C, for example, you wouldn't expect "^\\s*[qwerty]+" to be remotely
useful as a printf() format, but it might be exactly what you want for
some regular expression library.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From apt.shansen at gmail.com  Sat May 23 18:36:06 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sat, 23 May 2009 15:36:06 -0700
Subject: When does the escape character work within raw strings?
In-Reply-To: <99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
	<mailman.600.1243016575.8015.python-list@python.org>
	<99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
Message-ID: <7a9c25c20905231536n3363ed9fuee18db13c18ff9e5@mail.gmail.com>

>
> > How do you know how a string object is going to be treated by any
> > given function?  Read the Fine Manual for that function.
>
> So am I to understand that there is no consistency in string handling
> throughout the standard modules/objects/methods?
>
> Seems to make python a lot more complicated than it needs to be, but
> okay.
>

What it seems like you're not understanding here is that regular expressions
are a special case.

\b means something in Python literals. It maps to a single character, \x08.
It _is_ a single character.

r"\b" is two characters, a slash followed by a b.

Regular expressions have an _entire_ range of their own special characters
that have nothing to do with Python special characters. For regular
expressions, \b -- that is, a slash followed by a b -- are TWO characters
(not one, like "\b" is to Python) that have special meaning.

Raw strings really exist SO you can do this. So you can do r"\b" and have
the slash-followed-by-b be encoded into two characters, which the re library
can then threat as a test for the blank string. Otherwise, you'd have to do
"\\b" and similar a LOT when building up regular expressions...

The re library just has its own rules for how it interprets strings. Its not
"no consistency". Its that regular expressions have meaning outside of
Python and Python's implementation follows that general meaning (some,
mostly, or to some other definition of how much).

--S
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From notontheweb at noisp.com  Sat May 23 18:49:51 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Sat, 23 May 2009 15:49:51 -0700
Subject: Cursor movement question
In-Reply-To: <gv6n8h$olu$1@panix3.panix.com>
References: <3cmRl.90415$iW4.57403@en-nntp-01.dc1.easynews.com>
	<wxoRl.328387$Yx2.227908@en-nntp-06.dc1.easynews.com>
	<gv6n8h$olu$1@panix3.panix.com>
Message-ID: <p4%Rl.11694$2p1.9417@en-nntp-08.dc1.easynews.com>

Aahz wrote:
> In article <wxoRl.328387$Yx2.227908 at en-nntp-06.dc1.easynews.com>,
> Jive Dadson  <notontheweb at noisp.com> wrote:
>> Gosh, you guys are slow. :-) I figured it out.
> 
> Perhaps you could post the solution for posterity's sake?

The double secret magic encantation is "WarpPointer."  Unfortunately, it 
does not work in a plain vanilla ScrolledWindow. ScrolledWindow captures 
the event and scrolls by the default scroll amount of 20 pixels. I think 
I can figure out a work-around, but I have not yet done so.

self.bmp.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)

def OnKeyDown(self, event):
         # Use direction keys to move cursor one pixel

         x,y = event.GetPosition()
         keycode = event.GetKeyCode()
         X = 0
         Y = 0
         if keycode == wx.WXK_LEFT:
             X = -1
         elif keycode == wx.WXK_RIGHT:
             X = 1
         elif keycode == wx.WXK_UP:
             Y = -1
         elif keycode == wx.WXK_DOWN:
             Y = 1
	else:
	    return

         x = max(0,min(self.size[0]-1,x+X))
         y = max(0,min(self.size[1]-1,y+Y))
         self.bmp.WarpPointer(x, y)
         self.bmp.SetFocus()


From notontheweb at noisp.com  Sat May 23 18:55:24 2009
From: notontheweb at noisp.com (Jive Dadson)
Date: Sat, 23 May 2009 15:55:24 -0700
Subject: wxPython gurus, please help
Message-ID: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>

    I have an application that opens an image file of the user's choice. 
   I have an exception handler for the case that the user selected a bad 
or unsupported image file.  My code is catching the exception, but 
unfortunately for me, after I exit the except-clause, wxPython is 
popping up its own message dialog from somewhere in deepest, darkest 
__core__.

    How do I make it not do that?

    Thankee much,
    Jive


From rzzzwilson at gmail.com  Sat May 23 20:28:07 2009
From: rzzzwilson at gmail.com (rzzzwilson at gmail.com)
Date: Sat, 23 May 2009 17:28:07 -0700 (PDT)
Subject: wxpython and zoom/pan image
Message-ID: <e5092503-1254-4dd5-a36f-83844b9d11f0@d19g2000prh.googlegroups.com>

Hi,

I've googled for this, but can only find things like openlayers that
is a web-based javascript solution.

I need to display an image at various zoom levels and want to allow
the user to pan around in the Google maps style, that is, left-click
hold and drag.  The code should also action double-clicks on the image
(but that's easy).

There are no 'standard' wxpython widgets that allow this.  Can anyone
point me to information on how to implement such a thing, or maybe
some working code?

Thanks,
Ross


From joelc at cognyx.com  Sat May 23 20:29:38 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sun, 24 May 2009 10:29:38 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <mailman.642.1243117397.8015.python-list@python.org>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>	<0033af48$0$9681$c3e8da3@news.astraweb.com>	<02282310$0$20616$c3e8da3@news.astraweb.com>
	<mailman.642.1243117397.8015.python-list@python.org>
Message-ID: <00346f94$0$9732$c3e8da3@news.astraweb.com>

Rhodri James wrote:
> On Sat, 23 May 2009 18:19:11 +0100, Joel Ross <joelc at cognyx.com> wrote:
> 
>> Now I can move onto next one.
> 
> Except that you still have the interesting issue that your environment
> isn't responding to '\r' correctly, which worries me rather.  Or did
> you never test that?
> 
Yeah I gave the "\r" a go and it kept printing out on a new line I will 
look into it.

Thanks for the heads up


From joelc at cognyx.com  Sat May 23 20:31:32 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sun, 24 May 2009 10:31:32 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <mailman.634.1243108131.8015.python-list@python.org>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<mailman.634.1243108131.8015.python-list@python.org>
Message-ID: <00347006$0$9732$c3e8da3@news.astraweb.com>

Dennis Lee Bieber wrote:
> 	flush() is working perfectly fine -- it says transmit any data still
> held within internal buffers. It is NOT a "clear screen", "clear line"
> terminal command.

I was mistaken about the sys.stout.flush(). I understand it a little 
more now thanks


From benjamin.kaplan at case.edu  Sat May 23 21:18:32 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 23 May 2009 21:18:32 -0400
Subject: wxPython gurus, please help
In-Reply-To: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>
References: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>
Message-ID: <ec96e1390905231818g5d4de9c4t29da7e98ea81afff@mail.gmail.com>

On Sat, May 23, 2009 at 6:55 PM, Jive Dadson <notontheweb at noisp.com> wrote:

>   I have an application that opens an image file of the user's choice.  I
> have an exception handler for the case that the user selected a bad or
> unsupported image file.  My code is catching the exception, but
> unfortunately for me, after I exit the except-clause, wxPython is popping up
> its own message dialog from somewhere in deepest, darkest __core__.
>
>   How do I make it not do that?
>

Hard to tell without seeing the relevant code. Try stripping down the
program until you get to the smallest program that still shows the error (
http://wiki.wxpython.org/MakingSampleApps). If you can't figure it out from
that, try asking on the wxPython mailing list (
http://lists.wxwidgets.org/mailman/listinfo/wxpython-users). You'll probably
get better advice there.
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From davea at ieee.org  Sat May 23 21:29:46 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 23 May 2009 21:29:46 -0400
Subject: wxpython and zoom/pan image
In-Reply-To: <e5092503-1254-4dd5-a36f-83844b9d11f0@d19g2000prh.googlegroups.com>
References: <e5092503-1254-4dd5-a36f-83844b9d11f0@d19g2000prh.googlegroups.com>
Message-ID: <4A18A30A.6050708@ieee.org>

rzzzwilson at gmail.com wrote:
> Hi,
>
> I've googled for this, but can only find things like openlayers that
> is a web-based javascript solution.
>
> I need to display an image at various zoom levels and want to allow
> the user to pan around in the Google maps style, that is, left-click
> hold and drag.  The code should also action double-clicks on the image
> (but that's easy).
>
> There are no 'standard' wxpython widgets that allow this.  Can anyone
> point me to information on how to implement such a thing, or maybe
> some working code?
>
> Thanks,
> Ross
>
>   
These are all (?) of the pieces in my working image display program.  It 
rotates and scales.  It's an exercise to the reader to divide it up.  
For example, you don't want to rerun all of this every time the mouse
drags a little.  So these are in two different places, where the first 
group only happens when you change the image file, or rotate by an angle 
other than 90 degrees
            self._img = wx.Image(self.fname, wx.BITMAP_TYPE_ANY)
            self._img = wx.EmptyImage(42, 42, True)  #create a plain 
black image, 42 x 42 pixels
            self._img = self._img.Rotate90()
            self._img = self._img.Rotate(-radians, center)

        img2 = img1.Scale(self.imageW()*scale/1000, 
self.imageH()*scale/1000)    #this is where image is scaled to final bit 
dimensions.  It's clipped during drawBitmap()
        tracer("drawStuff  Scale", "draw")
        bmp = wx.BitmapFromImage(img2)

        w, h = self.GetClientSize()                         #self is a 
subclass of Panel
        self.buffer = wx.EmptyBitmap(w, h)
        dc = wx.BufferedDC(wx.ClientDC(self), self.buffer)
        dc.DrawBitmap(bmp, cornerX, cornerY, False)

Hope this helps.  I tied the scaling to the mousewheel, and used drag to 
move the cornerX and cornerY.  Notice they can go negative, as well as 
positive.




From mwilson at the-wire.com  Sat May 23 21:33:49 2009
From: mwilson at the-wire.com (Mel)
Date: Sat, 23 May 2009 21:33:49 -0400
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<02282310$0$20616$c3e8da3@news.astraweb.com>
	<mailman.642.1243117397.8015.python-list@python.org>
	<00346f94$0$9732$c3e8da3@news.astraweb.com>
Message-ID: <gva85s$a9p$1@services.telesweet.net>

Joel Ross wrote:
> Rhodri James wrote:
[ ... ]
>> Except that you still have the interesting issue that your environment
>> isn't responding to '\r' correctly, which worries me rather.  Or did
>> you never test that?

> Yeah I gave the "\r" a go and it kept printing out on a new line I will
> look into it.

Are you running an Apple computer?

	Mel.




From steve at REMOVE-THIS-cybersource.com.au  Sat May 23 21:34:25 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 24 May 2009 01:34:25 GMT
Subject: When does the escape character work within raw strings?
References: <05c784bb-8a09-472b-96f8-5d23c20d89a7@v35g2000pro.googlegroups.com>
	<mailman.459.1242842772.8015.python-list@python.org>
	<3c1e017a-16b6-4acf-995a-00de525327c8@v23g2000pro.googlegroups.com>
	<mailman.554.1242963859.8015.python-list@python.org>
	<8b7d4018-fe1a-492d-84d3-1aae2a5fdf13@a5g2000pre.googlegroups.com>
	<mailman.600.1243016575.8015.python-list@python.org>
	<99ae23ca-1dc9-45af-b384-86ae5bcc99a2@y10g2000prc.googlegroups.com>
Message-ID: <00347e91$0$9679$c3e8da3@news.astraweb.com>

On Sat, 23 May 2009 14:05:10 -0700, walterbyrd wrote:

> On May 22, 12:22?pm, "Rhodri James"
>> How do you know how a string object is going to be treated by any given
>> function? ?Read the Fine Manual for that function.
> 
> So am I to understand that there is no consistency in string handling
> throughout the standard modules/objects/methods?

No, you have completely misunderstood.


> Seems to make python a lot more complicated than it needs to be, but
> okay.

No, you are imagining complexity that doesn't exist.

To the Python compiler, a string is a string is a string. The rules are 
very simple: you write a string literal using quotation marks to tell the 
compiler "the text between these delimiters are a literal string". Here 
are the delimiters understood by Python:


Regular strings, must be on a single line:
'  '  or  "  "

Regular strings, allowed to include multiple lines:
'''  '''  or  """  """

Raw strings, must be on a single line:
r'  '  or  r"  "

Raw strings, allowed to include multiple lines:
r'''  '''  or  r"""  """

Regular strings interpret backslash escapes specially: \c has special 
meaning depending on what c is. For example, \t is interpreted by the 
compiler as a tab, and \n is interpreted as a newline. Raw strings 
*don't* interpret backslashes specially (except that you can't end the 
raw string with an odd number of backslashes).

That is how you *create* string literals. It is 100% consistent all 
through Python: the rules apply in every module, in every function, 
everywhere, because the compiler creates the string before the function 
or module gets a chance to see the string.

Having been created, how the string is *used* depends on the application, 
and Python modules and functions are no different. Inside a calculator 
application, the meaning of the literal string "x/y" would be very 
different than it would be inside an application dealing with file names. 
Python modules are no different:

- the os module interprets many strings as file names according to the 
rules for your operating system: e.g. on Linux '/' separates parts of the 
pathname into sub-directories. On Windows, either forward or backslashes 
are used to separate directories, and ':' is used to separate drive 
letters from the path.

- the glob module interprets strings according to the rules for shell 
globbing: e.g. '*' means 'match any number of any character', '?' means 
'match a single of any character'.

- the re module interprets strings according to the rules for regular 
expressions: e.g. '.*' means 'match any number of any character (except 
newline by default)' and '\d' (backslash-d) means 'match a single decimal 
digit'.

- the urllib and urllib2 modules interpret strings according to the rules 
of dealing with URLs.


In every case, you construct the string literals using the same rules, 
but the *meaning* of them differs according to the application. Because 
regular expressions give special meanings to literal backslashes, it is 
inconvenient to create many regexes using regular strings, because you 
need to escape the backslashes. That's where raw strings are more useful.





-- 
Steven


From gagsl-py2 at yahoo.com.ar  Sat May 23 21:39:09 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 23 May 2009 22:39:09 -0300
Subject: from __future__ import absolute_import issue
References: <1aeb486c-eef8-453c-8d04-fd831a84f8e2@g22g2000pra.googlegroups.com>
	<mailman.562.1242978117.8015.python-list@python.org>
	<5d6c964f-8973-4aef-9b86-fa8b3f6855d7@f37g2000pro.googlegroups.com>
Message-ID: <op.uueuvj12x6zn5v@gabriel.sleipnir-bsas>

En Sat, 23 May 2009 12:32:24 -0300, LittleGrasshopper  
<seattlehanks at yahoo.com> escribi?:

> On May 22, 12:42?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Wed, 20 May 2009 20:18:02 -0300, LittleGrasshopper ?
>> <seattleha... at yahoo.com> escribi?:
>>
>> > It appears that either absolute imports (or my brain) aren't working.
>> > Given a module string.py which is in the same directory as a.py:
>>
>> > #File a.py
>> > from __future__ import absolute_import
>> > import string
>> > print string # Module imported is string.py in current directory, not
>> > standard library module
>>
>> absolute_import helps with imports inside a package (those are  
>> "relative" ?
>> imports, relative to the package). If a module is located in a  
>> directory ?
>> listed in sys.path, an absolute import will find it. I don't think  
>> there ?
>> is a way to avoid shadowing a standard module (other than ensuring the ?
>> standard directories come first in sys.path).
>
> You are right. If you have a directory in your PYTHONPATH before the
> standard library directories that has a string module, for example,
> absolute_import will not help you. I was getting confused by the fact
> that when I print sys.path from the python shell, the first entry is
> an empty string.
> This empty string must denote the current directory though, because:
>
> ['', '/usr/lib/python25.zip', '/usr/lib/python2.5', '/usr/lib/ ...]
>
> When I have this sys.path, doing an "import string" from a module
> where I have absolute imports enabled will still import the string
> module in the package (which also means it is in the same directory in
> this case.)

Mmm, I don't understand this. Do you mean that the current directory is a  
package (that is, it contains an __init__.py file? And the main script is  
there? Then, from Python's POV, it is NOT a package; packages are  
recognized only at import time; if you execute a script that happens to be  
inside a package directory, Python is not aware of the "packageness" of  
such directory.
In that case, all imports are absolute.
The current directory should not be a package (at least, not a package  
accessible from sys.path), nasty things may happen.

> So I think my string.py is being imported not because it
> is in the same package, but because the home directory is searched
> first.

Yes.

> The empty string doesn't make much sense though (at least in a
> Unix system, you would imagine it would be something like './') but I
> guess that synce Python is platform independent, the empty string is
> taken to denote the current directory.

Maybe you're surprised, but I don't think it's strange at all. Nobody  
writes open("./foo.txt") instead of open("foo.txt"), and  
os.path.normpath("./foo.txt") is actually "foo.txt". Having no path  
specification means "use the current directory" (at least in all OS that I  
know of, where "process' current directory" makes any sense)

-- 
Gabriel Genellina



From joelc at cognyx.com  Sat May 23 22:32:59 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sun, 24 May 2009 12:32:59 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <gva85s$a9p$1@services.telesweet.net>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>
	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>
	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>
	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>
	<0033af48$0$9681$c3e8da3@news.astraweb.com>
	<02282310$0$20616$c3e8da3@news.astraweb.com>
	<mailman.642.1243117397.8015.python-list@python.org>
	<00346f94$0$9732$c3e8da3@news.astraweb.com>
	<gva85s$a9p$1@services.telesweet.net>
Message-ID: <0228a4d8$0$19301$c3e8da3@news.astraweb.com>

Mel wrote:
> Joel Ross wrote:
>> Rhodri James wrote:
> [ ... ]
>>> Except that you still have the interesting issue that your environment
>>> isn't responding to '\r' correctly, which worries me rather.  Or did
>>> you never test that?
> 
>> Yeah I gave the "\r" a go and it kept printing out on a new line I will
>> look into it.
> 
> Are you running an Apple computer?
> 
> 	Mel.
> 
> 
No running a Linux fedora 9 box


From paulprobert at sbcglobal.net  Sat May 23 23:32:03 2009
From: paulprobert at sbcglobal.net (Paul Probert)
Date: Sat, 23 May 2009 22:32:03 -0500
Subject: wxPython gurus, please help
In-Reply-To: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>
References: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>
Message-ID: <kmrme6-9l2.ln1@sbcglobal.net>

Jive Dadson wrote:
>    I have an application that opens an image file of the user's choice.
>   I have an exception handler for the case that the user selected a bad
> or unsupported image file.  My code is catching the exception, but
> unfortunately for me, after I exit the except-clause, wxPython is
> popping up its own message dialog from somewhere in deepest, darkest
> __core__.
> 
>    How do I make it not do that?
> 
>    Thankee much,
>    Jive
In your line creating your app object do it like this to avoid
redirecting error output to a popup window:

app=wx.App(False)



From phillip.sitbon at gmail.com  Sat May 23 23:50:44 2009
From: phillip.sitbon at gmail.com (Phillip Sitbon)
Date: Sat, 23 May 2009 20:50:44 -0700 (PDT)
Subject: [Announcement] PyISAPIe version 1.1.0 Release Candidate 2
Message-ID: <27535e47-8ee0-46b5-a31c-a90c14968b2a@d19g2000prh.googlegroups.com>

Hello all,

I've recently revived the Python ISAPI Extension (PyISAPIe) project
and thought I'd share the newest release with you, version 1.1.0-rc2.

Development in bringing Python to Windows servers has been slow these
days, so hopefully this project can continue to fill a niche for those
who need good performance and stable functionality.

http://pyisapie.sourceforge.net/

I know there's a good number of folks that have used it or are
currently using it, so any feedback is appreciated in order to make
1.1.0 come around faster.

Thanks for all your support so far!

Cheers,

Phillip


From nazia.zaman11 at gmail.com  Sun May 24 00:41:37 2009
From: nazia.zaman11 at gmail.com (nazia)
Date: Sat, 23 May 2009 21:41:37 -0700 (PDT)
Subject: Extending C++ class in python
Message-ID: <c48594af-5410-44db-b181-9b703546273b@c18g2000prh.googlegroups.com>

Hi all,
I'm a newbie in Python and need help. Can anyone help me by explaining
the steps of extending a C++ class in Python with a simple example?
I'm not interested to use SWIG like tools.
Thanks for your time.

-Nazia


From where at anywhere.com  Sun May 24 01:36:48 2009
From: where at anywhere.com (AK)
Date: Sun, 24 May 2009 01:36:48 -0400
Subject: Problems with sys.stout.flush()
In-Reply-To: <00346f94$0$9732$c3e8da3@news.astraweb.com>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>	<0033af48$0$9681$c3e8da3@news.astraweb.com>	<02282310$0$20616$c3e8da3@news.astraweb.com>
	<mailman.642.1243117397.8015.python-list@python.org>
	<00346f94$0$9732$c3e8da3@news.astraweb.com>
Message-ID: <4a18dcff$0$5404$607ed4bc@cv.net>

Joel Ross wrote:
> Rhodri James wrote:
>> On Sat, 23 May 2009 18:19:11 +0100, Joel Ross <joelc at cognyx.com> wrote:
>>
>>> Now I can move onto next one.
>>
>> Except that you still have the interesting issue that your environment
>> isn't responding to '\r' correctly, which worries me rather.  Or did
>> you never test that?
>>
> Yeah I gave the "\r" a go and it kept printing out on a new line I will 
> look into it.
> 
> Thanks for the heads up

What happens when you run this little program:

import time, sys

print "ONE",
sys.stdout.flush()
time.sleep(0.5)
print "\rTWO",
sys.stdout.flush()
time.sleep(0.5)


The idea is that it should print ONE, flush it, sleep .5 sec so 
that you can see 'ONE', then return to start of line, print TWO, 
flush it so you can read it, and sleep another 0.5 sec.

NOTE comma after print statement.

Does that work for you?

-ak


From mohammed.abosalim at gmail.com  Sun May 24 02:49:21 2009
From: mohammed.abosalim at gmail.com (abosalim)
Date: Sat, 23 May 2009 23:49:21 -0700 (PDT)
Subject: Need Help
Message-ID: <5f238e07-8d39-4bb4-8c6a-cbd56412fb5a@c36g2000yqn.googlegroups.com>


#Gui
import re, collections
from Tkinter import *
from nltk_lite import tokenize

def words(text): return re.findall('[a-z]+', text.lower())
def train(features):
    model = collections.defaultdict(lambda: 1)
    for f in features:
        model[f] += 1
        return model
NWORDS = train(words(file('big1.txt').read()))
alphabet = 'abcdefghijklmnopqrstuvwxyz'
def edits1(word):
    s = [(word[:i], word[i:]) for i in range(len(word) + 1)]
    deletes = [a + b[1:] for a, b in s if b]
    transposes = [a + b[1] + b[0] + b[2:] for a, b in s if len(b)>1]
    replaces = [a + c + b[1:] for a, b in s for c in alphabet if b]
    inserts = [a + c + b for a, b in s for c in alphabet]
    return set(deletes + transposes + replaces + inserts)
def known_edits2(word):
    return set(e2 for e1 in edits1(word) for e2 in edits1(e1) if e2 in
NWORDS)
def known(words):
    return set(w for w in words if w in NWORDS)
def correct(word):
    candidates = known([word]) or known(edits1(word)) or known_edits2
(word) or [word]
    return max(candidates, key=lambda w: NWORDS[w])
def textcorrect(str):
    s=[]
    for i in tokenize.whitespace(str):
        s.append(correct(i))
        result= " ".join(s)
        return result

################################GUI
Part#####################################
class Ex3:
    def __init__(self, master):
        self.frame = Frame(master)
        self.frame.pack()
        self.field = Entry(self.frame)
        self.field.pack(side=TOP)
        self.contents = StringVar()
        self.field.config(text=self.contents)
        self.stop = Button(self.frame, text="Exit", fg="red",
command=self.frame.quit)
        self.stop.pack(side=RIGHT)
        self.enter = Button(self.frame, text="Correct", fg="black",
command=self.new)
        self.enter.pack(side=LEFT)

    def new(self):
        self.string = self.contents.get()
#pass contents of textfield to words()method above
        self.res=  words(self.string)
        self.frame2 = Frame()
        self.frame2.pack()
        self.words = Label(self.frame2, text=self.res, fg="blue", font=
("Arial", 16))
        self.words.pack()
root = Tk()
Ex3 = Ex3(root)
root.mainloop()



It print text without correction.I think it didn't enter the method or
any method above the gui.
Please if you have any information,inform me

















From Ron.Barak at lsi.com  Sun May 24 02:52:29 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 24 May 2009 07:52:29 +0100
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <4A157AF1.9020104@mrabarnett.plus.com>
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A250B@enbmail01.lsi.com>

 

> -----Original Message-----
> From: MRAB [mailto:google at mrabarnett.plus.com] 
> Sent: Thursday, May 21, 2009 19:02
> To: 'python-list at python.org'
> Subject: Re: A fast way to read last line of gzip archive ?
> 
> Barak, Ron wrote:
> > Hi,
> >  
> > I need to read the end of a 20 MB gzip archives (To extract 
> the date 
> > from the last line of a a gzipped log file).
> > The solution I have below takes noticeable time to reach the end of 
> > the gzip archive.
> >  
> > Does anyone have a faster solution to read the last line of 
> a gzip archive ?
> >  
> > Thanks,
> > Ron.
> >  
> > #!/usr/bin/env python
> >  
> > import gzip
> >  
> > path = "./a/20/mb/file.tgz"
> >  
> > in_file = gzip.open(path, "r")
> > first_line = in_file.readline()
> > print "first_line ==",first_line
> > in_file.seek(-500)
> > last_line = in_file.readlines()[-1]
> > print "last_line ==",last_line
> > 
> It takes a noticeable time to reach the end because, well, 
> the data is compressed! The compression method used requires 
> the preceding data to be read first.

I thought maybe someone has a way to unzip just the end portion of the archive (instead of the whole archive), as only the last part is needed for reading the last line.

Bye,
Ron.


From ldo at geek-central.gen.new_zealand  Sun May 24 03:17:07 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 24 May 2009 19:17:07 +1200
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
Message-ID: <gvas9k$vvf$1@lust.ihug.co.nz>

In message <mailman.525.1242941777.8015.python-list at python.org>, Christian 
Heimes wrote:

> Welcome to IEEE 754 floating point land! :)

It used to be worse in the days before IEEE 754 became widespread. Anybody 
remember a certain Prof William Kahan from Berkeley, and the foreword he 
wrote to the Apple Numerics Manual, 2nd Edition, published in 1988? It's 
such a classic piece that I think it should be posted somewhere...



From mail at microcorp.co.za  Sun May 24 03:19:45 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 24 May 2009 09:19:45 +0200
Subject: Problems with sys.stout.flush()
References: <0033652b$0$9724$c3e8da3@news.astraweb.com><a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com><0227b2f0$0$25303$c3e8da3@news.astraweb.com><fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com><0033af48$0$9681$c3e8da3@news.astraweb.com><02282310$0$20616$c3e8da3@news.astraweb.com><mailman.642.1243117397.8015.python-list@python.org><00346f94$0$9732$c3e8da3@news.astraweb.com><gva85s$a9p$1@services.telesweet.net>
	<0228a4d8$0$19301$c3e8da3@news.astraweb.com>
Message-ID: <004e01c9dc40$0992c0c0$0d00a8c0@Hendrik>

"Joel Ross" <joelc at cognyx.com>
To: <python-list at python.org>
Sent: Sunday, May 24, 2009 4:32 AM
Subject: Re: Problems with sys.stout.flush()


> Mel wrote:
> > Joel Ross wrote:
> >> Rhodri James wrote:
> > [ ... ]
> >>> Except that you still have the interesting issue that your environment
> >>> isn't responding to '\r' correctly, which worries me rather.  Or did
> >>> you never test that?
> > 
> >> Yeah I gave the "\r" a go and it kept printing out on a new line I will
> >> look into it.
> > 
> > Are you running an Apple computer?
> > 
> > Mel.
> > 
> > 
> No running a Linux fedora 9 box
> 
Was the last character of your print command a comma?

- Hendrik
 




From charlietaylor at users.sourceforge.net  Sun May 24 04:39:20 2009
From: charlietaylor at users.sourceforge.net (Charlie)
Date: Sun, 24 May 2009 08:39:20 +0000 (UTC)
Subject: Optimizing math functions
References: <mailman.619.1243084999.8015.python-list@python.org>
	<0033dace$0$9725$c3e8da3@news.astraweb.com>
Message-ID: <loom.20090524T083337-764@post.gmane.org>

Steven D'Aprano <steve <at> REMOVE-THIS-cybersource.com.au> writes:

> 
> On Sat, 23 May 2009 09:22:59 -0400, Esmail wrote:
> 
> > Hello all,
> > 
> > I would like to maximize or minimize a given math function over a
> > specific set of values, in Python preferably.
> ...
> > What it apparently can't do is for maximize (or minimize) functions that
> > contain two variables, x and y, or more. 


You might also look at:
http://pyparasol.sourceforge.net/example_1.html





From descentspb at gmail.com  Sun May 24 04:45:33 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sun, 24 May 2009 12:45:33 +0400
Subject: How to reuse TCP listening socket immediately after it was connected
	at least once?
Message-ID: <4A19092D.1030305@gmail.com>

I have written a socket server and some arbitrary clients. When I 
shutdown the server, and do socket.close(), I cannot immediately start 
it again cause it has some open sockets in TIME_WAIT state. It throws 
address already in use exception at me. I have searched for that in 
google but haven't found a way to solve that.

Tried
setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
but that does not help.

Is there a nice way to overcome this?


From pierre.imbaud at gmail.com  Sun May 24 05:08:05 2009
From: pierre.imbaud at gmail.com (Imbaud Pierre)
Date: Sun, 24 May 2009 11:08:05 +0200
Subject: monitoring friendly applications
In-Reply-To: <t9dc15pbsvhr3hbhkb2461phkd32t196jr@4ax.com>
References: <4a13cebd$0$9377$426a74cc@news.free.fr>
	<t9dc15pbsvhr3hbhkb2461phkd32t196jr@4ax.com>
Message-ID: <4a190e75$0$20352$426a74cc@news.free.fr>

Thanks a lot. Your suggestions lead me to pypi, (I knew it but didnt 
remember the exact spelling, and no obvious link from www.python.org), 
and from there to supervisord, that answers pretty well my problem. 
Thanks again.

Tim Roberts wrote:
> Imbaud Pierre <pierre.imbaud at gmail.com> wrote:
>> I have A LOT of batch applications to monitor, on linux machines, mostly 
>> written in python.
>> I have to know:
>> - which are active, at a given moment?
>> - when did the last run occur? How long did it last?
>> - for some daemons: are they stuck? generally, waiting for i/o, or lost 
>> in some C call.
>> ...
>> By any chance, does something like this exist? Would someone be 
>> interested with this development?
> 
> http://www.letmegooglethatforyou.com?q=python+daemon+tools


From garabik-news-2005-05 at kassiopeia.juls.savba.sk  Sun May 24 06:37:16 2009
From: garabik-news-2005-05 at kassiopeia.juls.savba.sk (garabik-news-2005-05 at kassiopeia.juls.savba.sk)
Date: Sun, 24 May 2009 10:37:16 +0000 (UTC)
Subject: A fast way to read last line of gzip archive ?
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
Message-ID: <gvb80s$7rl$2@aioe.org>

Barak, Ron <Ron.Barak at lsi.com> wrote:
> 
> 
> 
> I thought maybe someone has a way to unzip just the end portion of the
> archive (instead of the whole archive), as only the last part is needed
> for reading the last line.

dictzip (python implementation part of my serpento package)
you have to compress the file with dictzip, instead of gzip, though
(but dictzipped file is just a special way of organizing the gzip file,
so it remains perfectly compatible with gunzip&comp.)


-- 
 -----------------------------------------------------------
| Radovan Garab?k http://kassiopeia.juls.savba.sk/~garabik/ |
| __..--^^^--..__    garabik @ kassiopeia.juls.savba.sk     |
 -----------------------------------------------------------
Antivirus alert: file .signature infected by signature virus.
Hi! I'm a signature virus! Copy me into your signature file to help me spread!


From willgun at live.cn  Sun May 24 06:42:13 2009
From: willgun at live.cn (=?gb2312?B?w8/svw==?=)
Date: Sun, 24 May 2009 18:42:13 +0800
Subject: help! Troubled when embed python into C++
Message-ID: <BAY106-DS78529887F87C21F9B4CDFAD540@phx.gbl>

I have the following codes in C++: 
#include <Python.h> 
void main(){ 
Py_Initialize(); 
PyRun_SimpleString("execfile(r'1.py')"); 
Py_Finalize(); 
return; 
} 

the following is in 1.py  : 
import Tkinter 
root=Tkinter.Tk() 
root2=Tkinter.Tk() 
root.mainloop() 
root2.mainloop() 

this is the output after I run the c++ program: 
Traceback (most recent call last): 
  File " <string>", line 1, in <module> 
  File "g:\volatile\1.py", line 2, in <module> 
    root=Tkinter.Tk() 
  File "C:\Python26\lib\lib-tk\Tkinter.py", line 1638, i 
    baseName = os.path.basename(sys.argv[0]) 
AttributeError: 'module' object has no attribute 'argv' 

I am quite new to python ,anyone know what shoud i do to solve it?
Thanks a lot!

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From joelc at cognyx.com  Sun May 24 06:43:56 2009
From: joelc at cognyx.com (Joel Ross)
Date: Sun, 24 May 2009 20:43:56 +1000
Subject: Problems with sys.stout.flush()
In-Reply-To: <4a18dcff$0$5404$607ed4bc@cv.net>
References: <0033652b$0$9724$c3e8da3@news.astraweb.com>	<a1b54e72-9a49-4bfe-bcf1-75d34aa8e3ab@i28g2000prd.googlegroups.com>	<0227b2f0$0$25303$c3e8da3@news.astraweb.com>	<fa30d6b2-de2f-4256-b5a6-efc92498b2f8@y33g2000prg.googlegroups.com>	<0033af48$0$9681$c3e8da3@news.astraweb.com>	<02282310$0$20616$c3e8da3@news.astraweb.com>
	<mailman.642.1243117397.8015.python-list@python.org>
	<00346f94$0$9732$c3e8da3@news.astraweb.com>
	<4a18dcff$0$5404$607ed4bc@cv.net>
Message-ID: <0034ff8f$0$9695$c3e8da3@news.astraweb.com>

AK wrote:

> import time, sys
> 
> print "ONE",
> sys.stdout.flush()
> time.sleep(0.5)
> print "\rTWO",
> sys.stdout.flush()
> time.sleep(0.5)
>

Running the command above prints out
ONE
TWO

but running

for i in range(10):
     print "ONE",
     time.sleep(0.2)

prints out
ONE ONE ONE ONE ONE ONE ONE ONE ONE ONE

like Hendrik mentioned adding comma to the end prints out on one line. 
But my problem problem wasn't printing on one line it was mathematical 
each time I printed on one line it was appending the print before. Which 
is all the above command does anyway. I had to apply some maths to solve 
the issue I was having which was printing out a progress bar. I Got it 
working though.

jross


From ldo at geek-central.gen.new_zealand  Sun May 24 06:45:11 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 24 May 2009 22:45:11 +1200
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
Message-ID: <gvb8fn$7gm$1@lust.ihug.co.nz>

In message <mailman.651.1243154739.8015.python-list at python.org>, Igor Katson 
wrote:

> I have written a socket server and some arbitrary clients. When I
> shutdown the server, and do socket.close(), I cannot immediately start
> it again cause it has some open sockets in TIME_WAIT state. It throws
> address already in use exception at me.

There's a reason for that. It's to ensure that there are no leftover packets 
floating around the Internet somewhere, that you might mistakenly receive 
and think they were part of a new connection, when they were in fact part of 
an old one.

The right thing to do is try to ensure that all your connections are 
properly closed at shutdown. That may not be enough (if your server crashes 
due to bugs), so the other thing you need to do is retry the socket open, 
say, at 30-second intervals, until it succeeds.



From descentspb at gmail.com  Sun May 24 06:46:24 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sun, 24 May 2009 14:46:24 +0400
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
In-Reply-To: <4A19092D.1030305@gmail.com>
References: <4A19092D.1030305@gmail.com>
Message-ID: <4A192580.5090308@gmail.com>

Igor Katson wrote:
> I have written a socket server and some arbitrary clients. When I 
> shutdown the server, and do socket.close(), I cannot immediately start 
> it again cause it has some open sockets in TIME_WAIT state. It throws 
> address already in use exception at me. I have searched for that in 
> google but haven't found a way to solve that.
>
> Tried
> setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
> but that does not help.
>
> Is there a nice way to overcome this?
Solved myself. SO_REUSEADDE should be used on the second listening 
socket creation (while time_wait already hangs)


From ldo at geek-central.gen.new_zealand  Sun May 24 06:47:51 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 24 May 2009 22:47:51 +1200
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
Message-ID: <gvb8kn$7gm$2@lust.ihug.co.nz>

In message <7b986ef0-d118-4e0c-
afef-3c6385a4c6e6 at b7g2000pre.googlegroups.com>, rustom wrote:

> For a mathematician there are no inexact numbers; for a physicist no
> exact ones.

On the contrary, mathematics have worked out a precise theory of 
inexactness.

As for exactitude in physics, Gregory Chaitin among others has been trying 
to rework physics to get rid of real numbers altogether.



From vad.viktor at gmail.com  Sun May 24 06:54:19 2009
From: vad.viktor at gmail.com (Ikon)
Date: Sun, 24 May 2009 03:54:19 -0700 (PDT)
Subject: How does Python's OOP feel?
Message-ID: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>

I'm rather new to Python. I have PHP for my main language and I do
some Java. They all have a very strict OO schema. As I red through
Python's tutorial it seams it has nothing of those rules. No statical,
abstract classes, functions, or variables.

I wish someone, who has experience in both Java/PHP/C# and Python
would tell me how mush better/worse is it to program in a language
that misses most of the OO parts!


From gdamjan at gmail.com  Sun May 24 07:02:45 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Sun, 24 May 2009 13:02:45 +0200
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
Message-ID: <l3mne6-shd.ln1@archaeopteryx.softver.org.mk>



> I have written a socket server and some arbitrary clients. When I
> shutdown the server, and do socket.close(), I cannot immediately start
> it again cause it has some open sockets in TIME_WAIT state. It throws
> address already in use exception at me. I have searched for that in
> google but haven't found a way to solve that.
> 
> Tried
> setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
> but that does not help.

This should work, AFAIK you only need to do it before you call .bind(..) 
on the accept-ing socket



-- 
?????? ( http://softver.org.mk/damjan/ )

Give me the knowledge to change the code I do not accept, 
the wisdom not to accept the code I cannot change, 
and the freedom to choose my preference.



From andrea.gavana at gmail.com  Sun May 24 07:28:05 2009
From: andrea.gavana at gmail.com (Infinity77)
Date: Sun, 24 May 2009 04:28:05 -0700 (PDT)
Subject: Multiprocessing and file I/O
Message-ID: <ab7dd7b6-40dd-46a7-8bda-d30d9bfbb7df@m17g2000vbi.googlegroups.com>

Hi All,

    I am trying to speed up some code which reads a bunch of data from
a disk file. Just for the fun of it, I thought to try and use parallel
I/O to split the reading of the file between multiple processes.
Although I have been warned that concurrent access by multiple
processes to the same file may actually slow down the reading of the
file, I was curious to try some timings by varying the number of
processes which read the file. I know almost nothing of
multiprocessing, so I was wondering if anyone had some very simple
snippet of code which demonstrates how to read a file using
multiprocessing.

My idea was to create a "big" file by doing:

fid = open("somefile.txt", "wb")
fid.write("HELLO\n"*1e7)
fid.close()

and then using fid.seek() to point every process I start to a position
inside the file and start reading from there. For example, with 4
processes and a 10 MB file, I would tell the first process to read
from byte 0 to byte 2.5 million, the second one from 2.5 million to 5
million and so on. I just have an academic curiosity :-D

Any suggestion is very welcome, either to the approach or to the
actual implementation. Thank you for your help.

Andrea.


From a.cavallo at mailsnare.com  Sun May 24 08:05:30 2009
From: a.cavallo at mailsnare.com (A. Cavallo)
Date: Sun, 24 May 2009 13:05:30 +0100
Subject: help! Troubled when embed python into C++
In-Reply-To: <BAY106-DS78529887F87C21F9B4CDFAD540@phx.gbl>
References: <BAY106-DS78529887F87C21F9B4CDFAD540@phx.gbl>
Message-ID: <200905241305.30321.a.cavallo@mailsnare.com>

You need the:

int main(int argc, char * argv[])
{
    Py_Initialize();
    PySys_SetArgv(argc, argv);
    PyRun_SimpleString("execfile(r'1.py')");
    Py_Finalize();
    return 0;
}


Regards,
Antonio

On Sunday 24 May 2009 11:42:13 ?? wrote:
> I have the following codes in C++:
> #include <Python.h>
> void main(){
> Py_Initialize();
> PyRun_SimpleString("execfile(r'1.py')");
> Py_Finalize();
> return;
> }
>
> the following is in 1.py  :
> import Tkinter
> root=Tkinter.Tk()
> root2=Tkinter.Tk()
> root.mainloop()
> root2.mainloop()
>
> this is the output after I run the c++ program:
> Traceback (most recent call last):
>   File " <string>", line 1, in <module>
>   File "g:\volatile\1.py", line 2, in <module>
>     root=Tkinter.Tk()
>   File "C:\Python26\lib\lib-tk\Tkinter.py", line 1638, i
>     baseName = os.path.basename(sys.argv[0])
> AttributeError: 'module' object has no attribute 'argv'
>
> I am quite new to python ,anyone know what shoud i do to solve it?
> Thanks a lot!



From jonas.esp at googlemail.com  Sun May 24 08:06:13 2009
From: jonas.esp at googlemail.com (Kless)
Date: Sun, 24 May 2009 05:06:13 -0700 (PDT)
Subject: Set a variable as in setter
Message-ID: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>

Is there any way to simplify the next code? Because I'm setting a
variable by default of the same way than it's set in the setter.

-------------------
class Foo(object):
   def __init__(self, bar):
      self._bar = self._change(bar)  # !!! as setter

   @property
   def bar(self):
      return self._bar

   @bar.setter
   def bar(self, bar):
      self._bar = self._change(bar)  # !!! as in init

   def _change(self, text):
      return text + 'any change'
-------------------


From descentspb at gmail.com  Sun May 24 08:10:05 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sun, 24 May 2009 16:10:05 +0400
Subject: Multiprocessing and file I/O
In-Reply-To: <ab7dd7b6-40dd-46a7-8bda-d30d9bfbb7df@m17g2000vbi.googlegroups.com>
References: <ab7dd7b6-40dd-46a7-8bda-d30d9bfbb7df@m17g2000vbi.googlegroups.com>
Message-ID: <4A19391D.9090304@gmail.com>

Infinity77 wrote:
> Hi All,
>
>     I am trying to speed up some code which reads a bunch of data from
> a disk file. Just for the fun of it, I thought to try and use parallel
> I/O to split the reading of the file between multiple processes.
> Although I have been warned that concurrent access by multiple
> processes to the same file may actually slow down the reading of the
> file, I was curious to try some timings by varying the number of
> processes which read the file. I know almost nothing of
> multiprocessing, so I was wondering if anyone had some very simple
> snippet of code which demonstrates how to read a file using
> multiprocessing.
>
> My idea was to create a "big" file by doing:
>
> fid = open("somefile.txt", "wb")
> fid.write("HELLO\n"*1e7)
> fid.close()
>
> and then using fid.seek() to point every process I start to a position
> inside the file and start reading from there. For example, with 4
> processes and a 10 MB file, I would tell the first process to read
> from byte 0 to byte 2.5 million, the second one from 2.5 million to 5
> million and so on. I just have an academic curiosity :-D
>
> Any suggestion is very welcome, either to the approach or to the
> actual implementation. Thank you for your help.
>
> Andrea.
>   
If the thing you would want to speed up is the processing of the file 
(and not the IO), I would make one process actually read the file, and 
feed the other processes with the data from the file through a queue.


From a.cavallo at mailsnare.com  Sun May 24 08:14:30 2009
From: a.cavallo at mailsnare.com (A. Cavallo)
Date: Sun, 24 May 2009 13:14:30 +0100
Subject: Replacing module with a stub for unit testing
In-Reply-To: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>
References: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>
Message-ID: <200905241314.30576.a.cavallo@mailsnare.com>

how about the old and simple:

import ExpensiveModuleStub as ExpensiveModule

On a different league you could make use of decorator and creating caching
objects but that depends entirely on the requirements (how strict your test 
must be, test data sizes involved and more, much more details).

Regards,
Antonio



On Saturday 23 May 2009 14:00:15 pigmartian at gmail.com wrote:
> Hi,
>
> I'm working on a unit test framework for a module.  The module I'm
> testing indirectly calls another module which is expensive to access
> --- CDLLs whose functions access a database.
>
>     test_MyModule --->MyModule--->IntermediateModule---
>
> >ExpensiveModule
>
> I want to create a stub of ExpensiveModule and have that be accessed
> by IntermediateModule instead of the real version
>
>     test_MyModule --->MyModule--->IntermediateModule---
>
> >ExpensiveModuleStub
>
> I tried the following in my unittest:
>
>     import ExpensiveModuleStub
>     sys.modules['ExpensiveModule'] = ExpensiveModuleStub # Doesn't
> work
>
> But, import statements in the IntermediateModule still access the real
> ExpensiveModule, not the stub.
>
> The examples I can find of creating and using Mock or Stub objects
> seem to all follow a pattern where the fake objects are passed in as
> arguments to the code being tested.  For example, see the "Example
> Usage" section here: http://python-mock.sourceforge.net.  But that
> doesn't work in my case as the module I'm testing doesn't directly use
> the module that I want to replace.
>
> Can anybody suggest something?
>
> Thanks,
>
> Scott



From duncan.booth at invalid.invalid  Sun May 24 08:27:13 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 24 May 2009 12:27:13 GMT
Subject: Set a variable as in setter
References: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>
Message-ID: <Xns9C1588DDA9E0Eduncanbooth@127.0.0.1>

Kless <jonas.esp at googlemail.com> wrote:

> Is there any way to simplify the next code? Because I'm setting a
> variable by default of the same way than it's set in the setter.
> 
> -------------------
> class Foo(object):
>    def __init__(self, bar):
>       self._bar = self._change(bar)  # !!! as setter

What's wrong with just doing this?:
        self.bar = bar

> 
>    @property
>    def bar(self):
>       return self._bar
> 
>    @bar.setter
>    def bar(self, bar):
>       self._bar = self._change(bar)  # !!! as in init
> 
>    def _change(self, text):
>       return text + 'any change'
> -------------------
> 



From ebonak at hotmail.com  Sun May 24 08:30:13 2009
From: ebonak at hotmail.com (Esmail)
Date: Sun, 24 May 2009 08:30:13 -0400
Subject: Optimizing math functions
In-Reply-To: <loom.20090524T083337-764@post.gmane.org>
References: <mailman.619.1243084999.8015.python-list@python.org>	<0033dace$0$9725$c3e8da3@news.astraweb.com>
	<loom.20090524T083337-764@post.gmane.org>
Message-ID: <4A193DD5.4090401@hotmail.com>

Charlie wrote:
> 
> You might also look at:
> http://pyparasol.sourceforge.net/example_1.html

Thanks for this lead, I had never heard of parasol before. Do you know
if this also works under Linux? The docs mention only the Windows platform,
but given that this is Python perhaps it is save to assume this would also
work under Linux?

Esmail



From ebonak at hotmail.com  Sun May 24 08:42:59 2009
From: ebonak at hotmail.com (Esmail)
Date: Sun, 24 May 2009 08:42:59 -0400
Subject: Optimizing math functions
In-Reply-To: <gv9pda$t3s$1@ger.gmane.org>
References: <gv8tbl$ph3$1@ger.gmane.org> <gv9pda$t3s$1@ger.gmane.org>
Message-ID: <4A1940D3.3000404@hotmail.com>

Robert Kern wrote:
> 
> 
> We have several bounded optimization routines in scipy.
> 
> http://docs.scipy.org/doc/scipy/reference/optimize.html

Hi Robert,

Thanks for the lead .. I briefly looked at the documentation, but
before I dig into this more deeply 2 quick questions:

1. Will is also allow me to maximize a function (I only saw minimum)?

2. Will it give me the global minima/maxima?

I only ask because I got all excited to see that R has an optimize
function but unfortunately it can not deal with multi-modal functions.
I am trying  to come up with some complex test cases for a genetic
algorithm I'm working with, both for functions using f(x) and f(x,y) over a
variety of intervals so I  would like to have a way to verify results for
more challenging functions.

Thanks a lot,

Esmail



From stef.mientki at gmail.com  Sun May 24 09:01:51 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 24 May 2009 15:01:51 +0200
Subject: how to get rid of pyc files ?
Message-ID: <4A19453F.5050204@gmail.com>

hello,

Moving my entire program section between windows and Ubuntu,
sometimes causes problems, due to the existence of pyc-files
(and probably because my program still has hard coded paths).

Now I want get rid of the pyc-files,
so I wrote a py-script to remoce all pyc-files,
but because it's run from the same program section,
a few pyc files are recreated.

Is there a way to prevent generating pyc-files ?
Or is there a way to redirect the generated pyc-files to a dedicated 
location ?

btw, What commandline switches are available for python ?
(googling didn't give me any relevant hits )

thanks,
Stef Mientki


From mk.fraggod at gmail.com  Sun May 24 09:03:26 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sun, 24 May 2009 19:03:26 +0600
Subject: Set a variable as in setter
In-Reply-To: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>
References: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>
Message-ID: <20090524190326.1b5363cd@coercion>

On Sun, 24 May 2009 05:06:13 -0700 (PDT)
Kless <jonas.esp at googlemail.com> wrote:

> Is there any way to simplify the next code? Because I'm setting a
> variable by default of the same way than it's set in the setter.
> 
> -------------------
> class Foo(object):
>    def __init__(self, bar):
>       self._bar = self._change(bar)  # !!! as setter

Guess it's obvious, but why not use "setattr(self, 'bar', bar)" here, in
__init__ - it'll just call defined setter.

>    @property
>    def bar(self):
>       return self._bar
> 
>    @bar.setter
>    def bar(self, bar):
>       self._bar = self._change(bar)  # !!! as in init
> 
>    def _change(self, text):
>       return text + 'any change'
> -------------------

-- 
Mike Kazantsev // fraggod.net
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From mk.fraggod at gmail.com  Sun May 24 09:07:27 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sun, 24 May 2009 19:07:27 +0600
Subject: how to get rid of pyc files ?
In-Reply-To: <4A19453F.5050204@gmail.com>
References: <4A19453F.5050204@gmail.com>
Message-ID: <20090524190727.4dee20fa@coercion>

On Sun, 24 May 2009 15:01:51 +0200
Stef Mientki <stef.mientki at gmail.com> wrote:

> Moving my entire program section between windows and Ubuntu,
> sometimes causes problems, due to the existence of pyc-files
> (and probably because my program still has hard coded paths).
> 
> Now I want get rid of the pyc-files,
> so I wrote a py-script to remoce all pyc-files,
> but because it's run from the same program section,
> a few pyc files are recreated.
> 
> Is there a way to prevent generating pyc-files ?
> Or is there a way to redirect the generated pyc-files to a dedicated 
> location ?

Use a "-B" command-line option or "PYTHONDONTWRITEBYTECODE=x" env var.
You can put either "alias python='python -B'" or
"export PYTHONDONTWRITEBYTECODE=x" to your .bashrc/profile and forget
about .pyc/pyo forever.

> btw, What commandline switches are available for python ?
> (googling didn't give me any relevant hits )

You might be amazed how much insight "man python" and "python -h" can
yield ;)

-- 
Mike Kazantsev // fraggod.net
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From mk.fraggod at gmail.com  Sun May 24 09:14:54 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sun, 24 May 2009 19:14:54 +0600
Subject: Set a variable as in setter
In-Reply-To: <20090524190326.1b5363cd@coercion>
References: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>
	<20090524190326.1b5363cd@coercion>
Message-ID: <20090524191454.6684b66d@coercion>

On Sun, 24 May 2009 19:03:26 +0600
Mike Kazantsev <mk.fraggod at gmail.com> wrote:

> On Sun, 24 May 2009 05:06:13 -0700 (PDT)
> Kless <jonas.esp at googlemail.com> wrote:
> 
> > Is there any way to simplify the next code? Because I'm setting a
> > variable by default of the same way than it's set in the setter.
> > 
> > -------------------
> > class Foo(object):
> >    def __init__(self, bar):
> >       self._bar = self._change(bar)  # !!! as setter
> 
> Guess it's obvious, but why not use "setattr(self, 'bar', bar)" here, in
> __init__ - it'll just call defined setter.

In fact, "self.bar = bar" is even simplier.
Somehow I thought it wouldn't work here, but it does.

> >    @property
> >    def bar(self):
> >       return self._bar
> > 
> >    @bar.setter
> >    def bar(self, bar):
> >       self._bar = self._change(bar)  # !!! as in init
> > 
> >    def _change(self, text):
> >       return text + 'any change'
> > -------------------
> 


-- 
Mike Kazantsev // fraggod.net
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From ebonak at hotmail.com  Sun May 24 09:15:07 2009
From: ebonak at hotmail.com (Esmail)
Date: Sun, 24 May 2009 09:15:07 -0400
Subject: how to get rid of pyc files ?
In-Reply-To: <4A19453F.5050204@gmail.com>
References: <4A19453F.5050204@gmail.com>
Message-ID: <4A19485B.1050204@hotmail.com>

Stef Mientki wrote:
> 
> btw, What commandline switches are available for python ?
> (googling didn't give me any relevant hits )

Hi Stef,

This is what I get w/ v2.6 under Ubuntu 9.04


9:12 esmail at t61 ~/Python  [510] python -h
usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ...
Options and arguments (and corresponding environment variables):
-B     : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x
-c cmd : program passed in as string (terminates option list)
-d     : debug output from parser; also PYTHONDEBUG=x
-E     : ignore PYTHON* environment variables (such as PYTHONPATH)
-h     : print this help message and exit (also --help)
-i     : inspect interactively after running script; forces a prompt even
          if stdin does not appear to be a terminal; also PYTHONINSPECT=x
-m mod : run library module as a script (terminates option list)
-O     : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x
-OO    : remove doc-strings in addition to the -O optimizations
-Q arg : division options: -Qold (default), -Qwarn, -Qwarnall, -Qnew
-s     : don't add user site directory to sys.path; also PYTHONNOUSERSITE
-S     : don't imply 'import site' on initialization
-t     : issue warnings about inconsistent tab usage (-tt: issue errors)
-u     : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x
          see man page for details on internal buffering relating to '-u'
-v     : verbose (trace import statements); also PYTHONVERBOSE=x
          can be supplied multiple times to increase verbosity
-V     : print the Python version number and exit (also --version)
-W arg : warning control; arg is action:message:category:module:lineno
-x     : skip first line of source, allowing use of non-Unix forms of #!cmd
-3     : warn about Python 3.x incompatibilities that 2to3 cannot trivially fix
file   : program read from script file
-      : program read from stdin (default; interactive mode if a tty)
arg ...: arguments passed to program in sys.argv[1:]

Other environment variables:
PYTHONSTARTUP: file executed on interactive startup (no default)
PYTHONPATH   : ':'-separated list of directories prefixed to the
                default module search path.  The result is sys.path.
PYTHONHOME   : alternate <prefix> directory (or <prefix>:<exec_prefix>).
                The default module search path uses <prefix>/pythonX.X.
PYTHONCASEOK : ignore case in 'import' statements (Windows).
PYTHONIOENCODING: Encoding[:errors] used for stdin/stdout/stderr.

XP looks similar enough (I didn't look through it for any differences):

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\> python -h
usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ...
Options and arguments (and corresponding environment variables):
-B     : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x
-c cmd : program passed in as string (terminates option list)
-d     : debug output from parser; also PYTHONDEBUG=x
-E     : ignore PYTHON* environment variables (such as PYTHONPATH)
-h     : print this help message and exit (also --help)
-i     : inspect interactively after running script; forces a prompt even
          if stdin does not appear to be a terminal; also PYTHONINSPECT=x
-m mod : run library module as a script (terminates option list)
-O     : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x
-OO    : remove doc-strings in addition to the -O optimizations
-Q arg : division options: -Qold (default), -Qwarn, -Qwarnall, -Qnew
-s     : don't add user site directory to sys.path; also PYTHONNOUSERSITE
-S     : don't imply 'import site' on initialization
-t     : issue warnings about inconsistent tab usage (-tt: issue errors)
-u     : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x
          see man page for details on internal buffering relating to '-u'
-v     : verbose (trace import statements); also PYTHONVERBOSE=x
          can be supplied multiple times to increase verbosity
-V     : print the Python version number and exit (also --version)
-W arg : warning control; arg is action:message:category:module:lineno
-x     : skip first line of source, allowing use of non-Unix forms of #!cmd
-3     : warn about Python 3.x incompatibilities
file   : program read from script file
-      : program read from stdin (default; interactive mode if a tty)
arg ...: arguments passed to program in sys.argv[1:]

Other environment variables:
PYTHONSTARTUP: file executed on interactive startup (no default)
PYTHONPATH   : ';'-separated list of directories prefixed to the
                default module search path.  The result is sys.path.
PYTHONHOME   : alternate <prefix> directory (or <prefix>;<exec_prefix>).
                The default module search path uses <prefix>\lib.
PYTHONCASEOK : ignore case in 'import' statements (Windows).
PYTHONIOENCODING: Encoding[:errors] used for stdin/stdout/stderr.


HTH,

Esmail



From roy at panix.com  Sun May 24 09:21:48 2009
From: roy at panix.com (Roy Smith)
Date: Sun, 24 May 2009 09:21:48 -0400
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
Message-ID: <roy-3C4DED.09214724052009@news.panix.com>

In article <gvb8fn$7gm$1 at lust.ihug.co.nz>,
 Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:

> In message <mailman.651.1243154739.8015.python-list at python.org>, Igor Katson 
> wrote:
> 
> > I have written a socket server and some arbitrary clients. When I
> > shutdown the server, and do socket.close(), I cannot immediately start
> > it again cause it has some open sockets in TIME_WAIT state. It throws
> > address already in use exception at me.
> 
> There's a reason for that. It's to ensure that there are no leftover packets 
> floating around the Internet somewhere, that you might mistakenly receive 
> and think they were part of a new connection, when they were in fact part of 
> an old one.

In theory, that is indeed the reason for the TIME_WAIT state.  In practice, 
however, using SO_REUSEADDR is pretty safe, and common practice.

You've got several things working in your favor.  First, late-delivery of 
packets is pretty rare.  Second, if some late packet were to arrive, the 
chances of them having the same local and remote port numbers as an 
existing connection is slim.  And, finally, the TCP sequence number won't 
line up.

One thing to be aware of is that SO_REUSEADDR isn't 100% portable.  There 
are some systems (ISTR HP-UX) which use SO_REUSEPORT instead of 
SO_REUSEADDR.  The original specifications weren't very clear, and some 
implementers read them in strange ways.  Some of that old code continues in 
use today.  I only mention this because if you try SO_REUSEADDR and it's 
not doing what you expect, it's worth trying SO_REUSEPORT (or both) to see 
what happens on your particular system.

> The right thing to do is try to ensure that all your connections are 
> properly closed at shutdown. That may not be enough (if your server crashes 
> due to bugs), so the other thing you need to do is retry the socket open, 
> say, at 30-second intervals, until it succeeds.

That may be a reasonable thing to do for production code, but when you're 
building and debugging a server, it's a real pain to not be able to restart 
it quickly whenever you want (or need) to.


From steve at REMOVE-THIS-cybersource.com.au  Sun May 24 09:30:05 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 24 May 2009 13:30:05 GMT
Subject: Replacing module with a stub for unit testing
References: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>
	<mailman.655.1243167260.8015.python-list@python.org>
Message-ID: <02293ea4$0$21844$c3e8da3@news.astraweb.com>

On Sun, 24 May 2009 13:14:30 +0100, A. Cavallo wrote:

> how about the old and simple:
> 
> import ExpensiveModuleStub as ExpensiveModule

No, that won't do, because for it to have the desired effort, it needs to 
be inside the IntermediateModule, not the Test_Module. That means that 
IntermediateModule needs to know if it is running in "test mode" or "real 
mode", and that's (1) possibly impractical, and (2) not great design.



-- 
Steven


From sjmachin at lexicon.net  Sun May 24 09:52:10 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 24 May 2009 06:52:10 -0700 (PDT)
Subject: Optimizing math functions
References: <gv8tbl$ph3$1@ger.gmane.org> <gv9pda$t3s$1@ger.gmane.org> 
	<mailman.657.1243168995.8015.python-list@python.org>
Message-ID: <1a945081-ccff-4119-a97f-f313313ca279@i28g2000prd.googlegroups.com>

On May 24, 10:42?pm, Esmail <ebo... at hotmail.com> wrote:
> Robert Kern wrote:
>
> > We have several bounded optimization routines in scipy.
>
> >http://docs.scipy.org/doc/scipy/reference/optimize.html
>
> Hi Robert,
>
> Thanks for the lead .. I briefly looked at the documentation, but
> before I dig into this more deeply 2 quick questions:
>
> 1. Will is also allow me to maximize a function (I only saw minimum)?

To maximise f(x,y), minimise -f(x,y)

HTH,
John


From sjmachin at lexicon.net  Sun May 24 09:58:06 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 24 May 2009 06:58:06 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org>
Message-ID: <f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com>

On May 24, 11:01?pm, Stef Mientki <stef.mien... at gmail.com> wrote:
> hello,
>
> Moving my entire program section between windows and Ubuntu,
> sometimes causes problems, due to the existence of pyc-files

What problems? Like avoiding having to recompile your .py files makes
your app run too fast?

> (and probably because my program still has hard coded paths).
>
> Now I want get rid of the pyc-files,

Which does nothing for the hard-coded paths issue ...


From ebonak at hotmail.com  Sun May 24 10:11:36 2009
From: ebonak at hotmail.com (Esmail)
Date: Sun, 24 May 2009 10:11:36 -0400
Subject: Optimizing math functions
In-Reply-To: <1a945081-ccff-4119-a97f-f313313ca279@i28g2000prd.googlegroups.com>
References: <gv8tbl$ph3$1@ger.gmane.org> <gv9pda$t3s$1@ger.gmane.org>
	<mailman.657.1243168995.8015.python-list@python.org>
	<1a945081-ccff-4119-a97f-f313313ca279@i28g2000prd.googlegroups.com>
Message-ID: <4A195598.2090805@hotmail.com>

John Machin wrote:
> 
>>
>> 1. Will is also allow me to maximize a function (I only saw minimum)?
> 
> To maximise f(x,y), minimise -f(x,y)

Ooops .. yes of course!

Thanks,
Esmail



From andrea.gavana at gmail.com  Sun May 24 10:13:52 2009
From: andrea.gavana at gmail.com (Infinity77)
Date: Sun, 24 May 2009 07:13:52 -0700 (PDT)
Subject: Multiprocessing and file I/O
References: <ab7dd7b6-40dd-46a7-8bda-d30d9bfbb7df@m17g2000vbi.googlegroups.com>
	<mailman.654.1243167010.8015.python-list@python.org>
Message-ID: <8e21bc22-ad0e-4c18-85e2-df6e84d1afc3@n8g2000vbb.googlegroups.com>

Hi Igor,

On May 24, 1:10?pm, Igor Katson <descent... at gmail.com> wrote:
> Infinity77 wrote:
> > Hi All,
>
> > ? ? I am trying to speed up some code which reads a bunch of data from
> > a disk file. Just for the fun of it, I thought to try and use parallel
> > I/O to split the reading of the file between multiple processes.
> > Although I have been warned that concurrent access by multiple
> > processes to the same file may actually slow down the reading of the
> > file, I was curious to try some timings by varying the number of
> > processes which read the file. I know almost nothing of
> > multiprocessing, so I was wondering if anyone had some very simple
> > snippet of code which demonstrates how to read a file using
> > multiprocessing.
>
> > My idea was to create a "big" file by doing:
>
> > fid = open("somefile.txt", "wb")
> > fid.write("HELLO\n"*1e7)
> > fid.close()
>
> > and then using fid.seek() to point every process I start to a position
> > inside the file and start reading from there. For example, with 4
> > processes and a 10 MB file, I would tell the first process to read
> > from byte 0 to byte 2.5 million, the second one from 2.5 million to 5
> > million and so on. I just have an academic curiosity :-D
>
> > Any suggestion is very welcome, either to the approach or to the
> > actual implementation. Thank you for your help.
>
> > Andrea.
>
> If the thing you would want to speed up is the processing of the file
> (and not the IO), I would make one process actually read the file, and
> feed the other processes with the data from the file through a queue.

No, the processing of the data is fast enough, as it is very simple.
What I was asking is if anyone could share an example of using
multiprocessing to read a file, along the lines I described above.

Andrea.


From descentspb at gmail.com  Sun May 24 10:44:49 2009
From: descentspb at gmail.com (Igor Katson)
Date: Sun, 24 May 2009 18:44:49 +0400
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
In-Reply-To: <roy-3C4DED.09214724052009@news.panix.com>
References: <mailman.651.1243154739.8015.python-list@python.org>	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
Message-ID: <4A195D61.1000600@gmail.com>

Roy Smith wrote:
> In article <gvb8fn$7gm$1 at lust.ihug.co.nz>,
>  Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
>
>   
>> In message <mailman.651.1243154739.8015.python-list at python.org>, Igor Katson 
>> wrote:
>>
>>     
>>> I have written a socket server and some arbitrary clients. When I
>>> shutdown the server, and do socket.close(), I cannot immediately start
>>> it again cause it has some open sockets in TIME_WAIT state. It throws
>>> address already in use exception at me.
>>>       
>> There's a reason for that. It's to ensure that there are no leftover packets 
>> floating around the Internet somewhere, that you might mistakenly receive 
>> and think they were part of a new connection, when they were in fact part of 
>> an old one.
>>     
>
> In theory, that is indeed the reason for the TIME_WAIT state.  In practice, 
> however, using SO_REUSEADDR is pretty safe, and common practice.
>
> You've got several things working in your favor.  First, late-delivery of 
> packets is pretty rare.  Second, if some late packet were to arrive, the 
> chances of them having the same local and remote port numbers as an 
> existing connection is slim.  And, finally, the TCP sequence number won't 
> line up.
>
> One thing to be aware of is that SO_REUSEADDR isn't 100% portable.  There 
> are some systems (ISTR HP-UX) which use SO_REUSEPORT instead of 
> SO_REUSEADDR.  The original specifications weren't very clear, and some 
> implementers read them in strange ways.  Some of that old code continues in 
> use today.  I only mention this because if you try SO_REUSEADDR and it's 
> not doing what you expect, it's worth trying SO_REUSEPORT (or both) to see 
> what happens on your particular system.
>
>   
>> The right thing to do is try to ensure that all your connections are 
>> properly closed at shutdown. That may not be enough (if your server crashes 
>> due to bugs), so the other thing you need to do is retry the socket open, 
>> say, at 30-second intervals, until it succeeds.
>>     
>
> That may be a reasonable thing to do for production code, but when you're 
> building and debugging a server, it's a real pain to not be able to restart 
> it quickly whenever you want (or need) to.
>   
Thanks for a great answer, Roy!


From Ron.Barak at lsi.com  Sun May 24 10:57:05 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 24 May 2009 15:57:05 +0100
Subject: wxpython and zoom/pan image
In-Reply-To: <e5092503-1254-4dd5-a36f-83844b9d11f0@d19g2000prh.googlegroups.com>
References: <e5092503-1254-4dd5-a36f-83844b9d11f0@d19g2000prh.googlegroups.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A251A@enbmail01.lsi.com>

 Hi Ross,
You probably would get more focused answers if you addressed the question to the wxPython list at wxpython-users at lists.wxwidgets.org
As for your question, seeing your (simplified) code might help: out of hand, what you want to do is catch the events you're interested in (e.g., double-left-click) and create functions/class-instances that would perform the needed actions.
I'd suggest reading "wxPython in Action" (ISBN 1-932394-62-1) as it would give you most of the answers you seek.
Bye,
Ron. 

> -----Original Message-----
> From: rzzzwilson at gmail.com [mailto:rzzzwilson at gmail.com] 
> Sent: Sunday, May 24, 2009 03:28
> To: python-list at python.org
> Subject: wxpython and zoom/pan image
> 
> Hi,
> 
> I've googled for this, but can only find things like 
> openlayers that is a web-based javascript solution.
> 
> I need to display an image at various zoom levels and want to 
> allow the user to pan around in the Google maps style, that 
> is, left-click hold and drag.  The code should also action 
> double-clicks on the image (but that's easy).
> 
> There are no 'standard' wxpython widgets that allow this.  
> Can anyone point me to information on how to implement such a 
> thing, or maybe some working code?
> 
> Thanks,
> Ross
> 
> 

From deets at nospam.web.de  Sun May 24 11:03:35 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 24 May 2009 17:03:35 +0200
Subject: Extending C++ class in python
In-Reply-To: <c48594af-5410-44db-b181-9b703546273b@c18g2000prh.googlegroups.com>
References: <c48594af-5410-44db-b181-9b703546273b@c18g2000prh.googlegroups.com>
Message-ID: <77t5u8F1i99bqU1@mid.uni-berlin.de>

nazia schrieb:
> Hi all,
> I'm a newbie in Python and need help. Can anyone help me by explaining
> the steps of extending a C++ class in Python with a simple example?
> I'm not interested to use SWIG like tools.
> Thanks for your time.

If your are not interested in using the tools provided for this task, I 
fear you won't get much help. I'd personally use SIP and can only 
recommend it.

Diez


From Ron.Barak at lsi.com  Sun May 24 11:05:36 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 24 May 2009 16:05:36 +0100
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <gvb80s$7rl$2@aioe.org>
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
	<gvb80s$7rl$2@aioe.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A251B@enbmail01.lsi.com>

 

> -----Original Message-----
> From: garabik-news-2005-05 at kassiopeia.juls.savba.sk 
> [mailto:garabik-news-2005-05 at kassiopeia.juls.savba.sk] 
> Sent: Sunday, May 24, 2009 13:37
> To: python-list at python.org
> Subject: Re: A fast way to read last line of gzip archive ?
> 
> Barak, Ron <Ron.Barak at lsi.com> wrote:
> > 
> > 
> > 
> > I thought maybe someone has a way to unzip just the end 
> portion of the 
> > archive (instead of the whole archive), as only the last part is 
> > needed for reading the last line.
> 
> dictzip (python implementation part of my serpento package) 
> you have to compress the file with dictzip, instead of gzip, 
> though (but dictzipped file is just a special way of 
> organizing the gzip file, so it remains perfectly compatible 
> with gunzip&comp.)

Unfortunately, the gzip archive isn't created by me, and I have no say in how it's created.
:-(

Thanks,
Ron.

> 
> 
> --
>  -----------------------------------------------------------
> | Radovan Garab?k http://kassiopeia.juls.savba.sk/~garabik/ |
> | __..--^^^--..__    garabik @ kassiopeia.juls.savba.sk     |
>  -----------------------------------------------------------
> Antivirus alert: file .signature infected by signature virus.
> Hi! I'm a signature virus! Copy me into your signature file 
> to help me spread!
> 
> 

From Scott.Daniels at Acm.Org  Sun May 24 11:06:32 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 24 May 2009 08:06:32 -0700
Subject: How does Python's OOP feel?
In-Reply-To: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
Message-ID: <T96dndkjXfi5_ITXnZ2dnUVZ_jidnZ2d@pdx.net>

Ikon wrote:
> I'm rather new to Python. I have PHP for my main language and I do
> some Java. They all have a very strict OO schema. As I red through
> Python's tutorial it seams it has nothing of those rules. No statical,
> abstract classes, functions, or variables.
> 
> I wish someone, who has experience in both Java/PHP/C# and Python
> would tell me how mush better/worse is it to program in a language
> that misses most of the OO parts!
It is freeing.  Simple experiments take far less time.  What many here
(myself included) will tell you is to spend the time you formerly
spent on defining and declaring types on creating test cases.  Then
you have nicely unit-tested code for only a bit more effort than you
had to spend on gettting a program to run before.

--Scott David  Daniels
Scott.Daniels at Acm.Org


From paul at boddie.org.uk  Sun May 24 11:16:37 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Sun, 24 May 2009 08:16:37 -0700 (PDT)
Subject: Multiprocessing and file I/O
References: <ab7dd7b6-40dd-46a7-8bda-d30d9bfbb7df@m17g2000vbi.googlegroups.com>
	<mailman.654.1243167010.8015.python-list@python.org>
	<8e21bc22-ad0e-4c18-85e2-df6e84d1afc3@n8g2000vbb.googlegroups.com>
Message-ID: <448f0706-546a-4945-aae3-00a1dcd9ea8d@c36g2000yqn.googlegroups.com>

On 24 Mai, 16:13, Infinity77 <andrea.gav... at gmail.com> wrote:
>
> No, the processing of the data is fast enough, as it is very simple.
> What I was asking is if anyone could share an example of using
> multiprocessing to read a file, along the lines I described above.

Take a look at this section in an article about multi-threaded
processing of large files:

http://effbot.org/zone/wide-finder.htm#a-multi-threaded-python-solution

Paul


From jonas.esp at googlemail.com  Sun May 24 11:33:39 2009
From: jonas.esp at googlemail.com (Kless)
Date: Sun, 24 May 2009 08:33:39 -0700 (PDT)
Subject: Set a variable as in setter
References: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>
	<Xns9C1588DDA9E0Eduncanbooth@127.0.0.1>
Message-ID: <df8b1d7a-c3ba-405a-aeb9-c57f74d552fc@g37g2000yqn.googlegroups.com>

On 24 mayo, 12:27, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Kless <jonas.... at googlemail.com> wrote:
> > Is there any way to simplify the next code? Because I'm setting a
> > variable by default of the same way than it's set in the setter.
>
> > -------------------
> > class Foo(object):
> > ? ?def __init__(self, bar):
> > ? ? ? self._bar = self._change(bar) ?# !!! as setter
>
> What's wrong with just doing this?:
> ? ? ? ? self.bar = bar

Because 'bar' is going to be modified before of be saved.


From Eric_Dexter at msn.com  Sun May 24 11:57:10 2009
From: Eric_Dexter at msn.com (edexter)
Date: Sun, 24 May 2009 08:57:10 -0700 (PDT)
Subject: wxpython and zoom/pan image
References: <e5092503-1254-4dd5-a36f-83844b9d11f0@d19g2000prh.googlegroups.com>
	<mailman.667.1243177035.8015.python-list@python.org>
Message-ID: <23e020b2-cc96-4f6e-8532-691d5eb989d4@d19g2000prh.googlegroups.com>

On May 24, 8:57?am, "Barak, Ron" <Ron.Ba... at lsi.com> wrote:
> ?Hi Ross,
> You probably would get more focused answers if you addressed the question to the wxPython list at wxpython-us... at lists.wxwidgets.org
> As for your question, seeing your (simplified) code might help: out of hand, what you want to do is catch the events you're interested in (e.g., double-left-click) and create functions/class-instances that would perform the needed actions.
> I'd suggest reading "wxPython in Action" (ISBN 1-932394-62-1) as it would give you most of the answers you seek.
> Bye,
> Ron.
>
>
>
> > -----Original Message-----
> > From: rzzzwil... at gmail.com [mailto:rzzzwil... at gmail.com]
> > Sent: Sunday, May 24, 2009 03:28
> > To: python-l... at python.org
> > Subject: wxpython and zoom/pan image
>
> > Hi,
>
> > I've googled for this, but can only find things like
> > openlayers that is a web-based javascript solution.
>
> > I need to display an image at various zoom levels and want to
> > allow the user to pan around in the Google maps style, that
> > is, left-click hold and drag. ?The code should also action
> > double-clicks on the image (but that's easy).
>
> > There are no 'standard' wxpython widgets that allow this. ?
> > Can anyone point me to information on how to implement such a
> > thing, or maybe some working code?
>
> > Thanks,
> > Ross- Hide quoted text -
>
> - Show quoted text -


I think I remember seeing an example about zooming somewhere on the
wxpython list or wiki...


From kwatch at gmail.com  Sun May 24 11:57:42 2009
From: kwatch at gmail.com (kwatch)
Date: Sun, 24 May 2009 08:57:42 -0700 (PDT)
Subject: [ANN] pyTenjin 0.7.0 - the fastest and full-featured template engine
Message-ID: <86f01119-a0e0-4f9f-833a-1f2b0c1435b2@d2g2000pra.googlegroups.com>

Hi,

I have released pyTenjin 0.7.0
http://www.kuwata-lab.com/tenjin/

pyTenjin is the fastest template engine for Python.
It is not only very fast but also full-featured and easy-to-use.
You can embed Python statements and expressions into your text file.
Tenjin converts it into Python program and evaluate it.

Features:
* very fast
  - x2 faster than Mako
  - x3 faster than Cheetah and Myghty
  - x9 faster than Django
  - x60 faster than Kid
* Full-featured
  - layout template
  - partial template
  - capturing
  - preprocessing
  - and so on...

You can see the detail of benchmark at:
http://www.kuwata-lab.com/tenjin/
(benchmark script is included in pyTenjin distribution.)


Enhancements in 0.7.0
---------------------

* Python 3.0 is now supported officially.
* Google AppEngine (GAE) supported.
  http://www.kuwata-lab.com/tenjin/pytenjin-faq.html#faq-google-appengine
* Logging support.
* enerate_tostrfun() can take not only encode-encoding but also
  decode-encoding.
* (Experimental) HTML helper functions are now provided.
* New command-line option '-a cache' supported.
* You can share caches between all engine objects.
* Pickle-base and text-base template caching support.

See CHANGES.txt for details.
  http://www.kuwata-lab.com/pytenjin-CHANGES.txt


Changes in 0.7.0
----------------

* 'cache' option for tenjin.Engine() changed.
* to_str() is changed to encode unicode object into binary(=str)
    using utf-8 encoding in default.
* Benchmark script now skips to do benchmark template libraries
  which are failed to import.


Bugfix in 0.7.0
----------------
* In preprocessing, error was raised when expression is not string.
  Now fixed.


Download and Install
--------------------

Type:

  $ sudo eazy_install Tenjin

Or:

  $ wget http://downloads.sourceforge.net/tenjin/Tenjin-0.7.0.tar.gz
  $ tar xzf Tenjin-0.7.0.tar.gz
  $ cd Tenjin-0.7.0
  $ sudo python setup.py install


Documents
---------

* User's Guide
  http://www.kuwata-lab.com/tenjin/pytenjin-users-guide.html

* FAQ
  http://www.kuwata-lab.com/tenjin/pytenjin-faq.html

* Examples
  http://www.kuwata-lab.com/tenjin/pytenjin-examples.html

* (Presentation) Tenjin - the fastest template engine in the world
  http://www.slideshare.net/kwatch/tenjin-the-wastest-template-engine-in-the-world



Have fun!

--
regards,
makoto kuwata



From piet at cs.uu.nl  Sun May 24 12:06:45 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 24 May 2009 18:06:45 +0200
Subject: Background subprocess help?
References: <mailman.609.1243044688.8015.python-list@python.org>
Message-ID: <m2eiue8oyy.fsf@cs.uu.nl>

>>>>> danshumaker <dan.shumaker at comcast.net> (d) wrote:

>d> Hi,
>d> I'm trying to do something as simple as this:

>d> "sleep 10; mail -s "test" dans < communicate_with_process &"

>d> which executes immediately because it is backgrounded with "&".

>d> or more generically in english:

>d> "do some long process in the background;  send me mail when it's done; allow
>d> me to quit the tool that started launched the long process."

This description does not correspond to the command above. First the
command is confusing because it uses quotes in a strange way. If the
quotes are meant as Python string quotes there is a problem because the
inner quotes are not escaped. If they are meant as shell quotes they
are completely wrong. So let us assume that the outer quotes are
meant at the linguistic level and the inner quotes are shell quotes. Of
course using quotes in such an ambiguous way is confusing. Moreover the
quotes around "test" are superfluous. They are only necessary if there
are spaces or other strange characters (shell metachars) in the subject
argument. 

So let us assume that the shell command you want to execute is:
sleep 10; mail -s "test" dans < communicate_with_process &

This will not do the whole thing in the background. It will do the first
part (sleep 10) and wait for it to complete; after that it will do the
mail command in the background. From your description it seems that you
want to do the combo in the background. In the shell this would be:

(sleep 10; mail -s "test" dans < communicate_with_process) &

And communicate_with_process is apparently a file; I suppose it is
written by the preceding command. If it would be the standard output of
the process it would be something like:

(sleep 10 | mail -s "test" dans) &
of course with sleep 10 replaced by something that generates output.

This is also suggested by your mentioning pipeline below.

>d> I've found several examples that are close but none of the permeatations I
>d> try work.  The closest examples I've found start sending signals to
>d> processes and/or callbacks and 50+ lines of python code.

>d> I found the cliUtils module which came close.. but no cigar.

>d> I find it hard to believe that a one liner in bash/tcsh has to end up being
>d> many lines in python.  That makes me think I'm missing something.

>d> Surely thousands of people have done this before -- start a background
>d> process and want notification when it's done.

Sequencing programs is the strength of a shell. It is not Pythons main
task, therefore it takes a little more effort for Python.

Running a combo in the background means there must be a process that
waits for the first program to complete and then starts the second one.
In the shell there will be another shell started, because of the () and
that will execute the two commands sequentially. So if you want to do it
in Python the same should be done. Python just doesn't have a convenient
syntax for this like the shell.

>d> Anybody have any suggestions on modules to  try or quick subprocess commands
>d> that work?  This came close
>d> http://docs.python.org/library/subprocess.html#replacing-shell-pipeline but
>d> no cigar too.

The easiest would be to also use the shell to do the sequencing. Why
reinvent the wheel? Like

p = Popen("sleep 10 | mail -s \"test\" dans", shell=True)

As you don't want to wait for the thing to complete, the p is almost
useless.

If you insist on doing it in Python I would recommend a fork to start
the new process. I suppose you are on a Posix system as you use & after
the shell command.

import os
from subprocess import Popen, PIPE

pid = os.fork()
if pid == 0: # child code
    p1 = Popen(["sleep", "10"], stdout=PIPE)
    p2 = Popen(["mail", "-s", "test", "dans"], stdin=p1.stdout)
    os._exit(0)

You could use: os._exit(os.waitpid(p2.pid, 0)[1]) but as you don't wait
for the child the actual exit status code is useless.

On Windows there is no fork(), therefore you would have to spawn a
separate Python program that only does the body of the if. 
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From Eric_Dexter at msn.com  Sun May 24 12:07:04 2009
From: Eric_Dexter at msn.com (edexter)
Date: Sun, 24 May 2009 09:07:04 -0700 (PDT)
Subject: Python -> R?
References: <mailman.623.1243088434.8015.python-list@python.org>
Message-ID: <42eea1a3-742c-4cc9-aaf9-54b7305dfc39@j18g2000prm.googlegroups.com>

On May 23, 8:20?am, Esmail <ebo... at hotmail.com> wrote:
> Hello!
>
> Anyone using Python scripts and accessing some of R's functionality?
> If so, what are you using? I have read about RPy, is that a good
> solution? Are there others that can be recommended or are preferred?
>
> I would prefer to code in Python instead of R :-)
>
> Thanks,
> Esmail

I was playing around with a r sound module and looking at the graphic
stuff and I have downloaded the rpy thing but I have never used
it....  I have been looking for a good excuse to use it...  It looks
like it could be useful for graphing stuff or maybe alogrithmic
(spelling I am sure) composition...  The R people have a publication
somewhat like the python papers where you might find something
intresting.


From piet at cs.uu.nl  Sun May 24 12:21:59 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 24 May 2009 18:21:59 +0200
Subject: wxPython gurus, please help
References: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>
Message-ID: <m2ab528o9k.fsf@cs.uu.nl>

>>>>> Jive Dadson <notontheweb at noisp.com> (JD) wrote:

>JD>    I have an application that opens an image file of the user's choice. I
>JD> have an exception handler for the case that the user selected a bad or
>JD> unsupported image file.  My code is catching the exception, but
>JD> unfortunately for me, after I exit the except-clause, wxPython is popping
>JD> up its own message dialog from somewhere in deepest, darkest __core__.

Do you really expect an answer? Without you giving any details, like the
essential part of your code, the actual error messages etc, how do you
think that anybody will be able to divine what is happening?

http://catb.org/esr/faqs/smart-questions.html
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From stef.mientki at gmail.com  Sun May 24 12:36:46 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 24 May 2009 18:36:46 +0200
Subject: wxPython gurus, please help
In-Reply-To: <m2ab528o9k.fsf@cs.uu.nl>
References: <C9%Rl.11880$Tp1.5229@en-nntp-01.dc1.easynews.com>
	<m2ab528o9k.fsf@cs.uu.nl>
Message-ID: <4A19779E.1010600@gmail.com>

Piet van Oostrum wrote:
>>>>>> Jive Dadson <notontheweb at noisp.com> (JD) wrote:
>>>>>>             
>
>   
>> JD>    I have an application that opens an image file of the user's choice. I
>> JD> have an exception handler for the case that the user selected a bad or
>> JD> unsupported image file.  My code is catching the exception, but
>> JD> unfortunately for me, after I exit the except-clause, wxPython is popping
>> JD> up its own message dialog from somewhere in deepest, darkest __core__.
>>     
>
> Do you really expect an answer? Without you giving any details, like the
> essential part of your code, the actual error messages etc, how do you
> think that anybody 
he did ask for gurus ;-)
> will be able to divine what is happening?
>
> http://catb.org/esr/faqs/smart-questions.html
>   



From pythoncurious at gmail.com  Sun May 24 13:09:13 2009
From: pythoncurious at gmail.com (pythoncurious at gmail.com)
Date: Sun, 24 May 2009 10:09:13 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org> 
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com>
Message-ID: <26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com>

On May 24, 3:58?pm, John Machin <sjmac... at lexicon.net> wrote:
>
> What problems? Like avoiding having to recompile your .py files makes
> your app run too fast?
>

There are real problems with this. I'm having similar problems when
switching
between Solaris and Windows.
The code is in clearcase, which uses some sort of network file
system.
In our case, that means that I'll be accessing the same directories
from both
platforms, so .pyc-files from one platform will be visible when I run
the
code on the other platform.

The .pyc-file will contain a string pointing to the file is was built
from.
The path to that file will be different under different platforms, so
when the
string is used, there will be error printouts.
At least I think that's the problem, the error printouts contains
paths that
are only valid on the other platform.
I don't have access to those computers atm, so I can't show the exact
message.

The only solution I've seen is to make sure to clean up the .pyc files
each
time I switch platform.


From danwgrace at gmail.com  Sun May 24 13:15:28 2009
From: danwgrace at gmail.com (Daniel)
Date: Sun, 24 May 2009 10:15:28 -0700 (PDT)
Subject: command prompt: the ntvdm cpu has encountered an illegal instruction
Message-ID: <5212e4f8-d152-4f29-9d86-c0ef3f87ec3c@b1g2000vbc.googlegroups.com>

If I try to invoke python via the command prompt I get an error
"command prompt: the ntvdm cpu has encountered an illegal
instruction..."

I don't get this problem if I first cd to the python directory.  I am
running python 3.0 on windows.


From gh at ghaering.de  Sun May 24 13:32:39 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Sun, 24 May 2009 19:32:39 +0200
Subject: command prompt: the ntvdm cpu has encountered an illegal
	instruction
In-Reply-To: <5212e4f8-d152-4f29-9d86-c0ef3f87ec3c@b1g2000vbc.googlegroups.com>
References: <5212e4f8-d152-4f29-9d86-c0ef3f87ec3c@b1g2000vbc.googlegroups.com>
Message-ID: <gvc0bn$8p3$1@ger.gmane.org>

Daniel wrote:
> If I try to invoke python via the command prompt I get an error
> "command prompt: the ntvdm cpu has encountered an illegal
> instruction..."
> 
> I don't get this problem if I first cd to the python directory.  I am
> running python 3.0 on windows.

Running Python from the Cygwin shell? Try from outside Cygwin, then.

-- Gerhard



From danwgrace at gmail.com  Sun May 24 13:41:01 2009
From: danwgrace at gmail.com (Daniel)
Date: Sun, 24 May 2009 10:41:01 -0700 (PDT)
Subject: command prompt: the ntvdm cpu has encountered an illegal 
	instruction
References: <5212e4f8-d152-4f29-9d86-c0ef3f87ec3c@b1g2000vbc.googlegroups.com>
	<mailman.670.1243186373.8015.python-list@python.org>
Message-ID: <b3800c30-2c75-454c-a328-25f40234881a@e20g2000vbc.googlegroups.com>

On 24 May, 18:32, Gerhard H?ring <g... at ghaering.de> wrote:
>
> Running Python from the Cygwin shell? Try from outside Cygwin, then.
>

No I am running from the windows command prompt.



From cdalten at gmail.com  Sun May 24 13:41:53 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sun, 24 May 2009 10:41:53 -0700 (PDT)
Subject: Can I get a technical explanation on the following error
Message-ID: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>

How come something like '\'  causes an error? Here is what I mean.

[cdalten at localhost ~]$ python
Python 2.6.2 (r262:71600, May  3 2009, 17:04:44)
[GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> print "test \"
  File "<stdin>", line 1
    print "test \"
                 ^
SyntaxError: EOL while scanning string literal
>>>

I mean, isn't the '\' a character just like the letter 't'?


From jonas.esp at googlemail.com  Sun May 24 13:53:53 2009
From: jonas.esp at googlemail.com (Kless)
Date: Sun, 24 May 2009 10:53:53 -0700 (PDT)
Subject: Set a variable as in setter
References: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>
	<Xns9C1588DDA9E0Eduncanbooth@127.0.0.1>
	<df8b1d7a-c3ba-405a-aeb9-c57f74d552fc@g37g2000yqn.googlegroups.com>
Message-ID: <ecd184fa-8894-4435-8059-3f00689dae1f@s1g2000prd.googlegroups.com>

On 24 mayo, 15:33, Kless <jonas.... at googlemail.com> wrote:
> On 24 mayo, 12:27, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
>
> > Kless <jonas.... at googlemail.com> wrote:
> > > Is there any way to simplify the next code? Because I'm setting a
> > > variable by default of the same way than it's set in the setter.
>
> > > -------------------
> > > class Foo(object):
> > > ? ?def __init__(self, bar):
> > > ? ? ? self._bar = self._change(bar) ?# !!! as setter
>
> > What's wrong with just doing this?:
> > ? ? ? ? self.bar = bar
>
> Because 'bar' is going to be modified before of be saved.

Sorry! It works well. The problem was because I was using it from
iPython.


From matt at tplus1.com  Sun May 24 14:16:49 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Sun, 24 May 2009 18:16:49 GMT
Subject: I need help building a data structure for a state diagram
Message-ID: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>

I'm working on a really simple workflow for my bug tracker.  I want
filed bugs to start in an UNSTARTED status.  From there, they can go to
STARTED.

>From STARTED, bugs can go to FINISHED or ABANDONED.

I know I can easily hard-code this stuff into some if-clauses, but I
expect to need to add a lot more statuses over time and a lot more
relationships.

This seems like a crude state diagram.  So, has anyone on this list done
similar work?

How should I design this so that users can add arbitrary new statuses
and then define how to get to and from those statuses?

TIA

MAtt


From zasaconsulting at gmail.com  Sun May 24 14:46:01 2009
From: zasaconsulting at gmail.com (Alexzive)
Date: Sun, 24 May 2009 11:46:01 -0700 (PDT)
Subject: writing on file not until the end
Message-ID: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>

Hello,
I am a newby with python. I wrote the following code to extract a text
from a file and write it to another file:

linestring = open(path, 'r').read() #read all the inp file in
linestring

i=linestring.index("*NODE")
i=linestring.index("E",i)
e=linestring.index("*",i+10)
textN = linestring[i+2:e-1] # crop the ELement+nodes list
Nfile = open("N.txt", "w")
Nfile.write(textN)

unfortunately when I check N.txt some lines are missing (it only crop
until "57, 0.231749688431, 0.0405121944142" but I espect the final
line to be "242, 0.2979675, 0.224605896461". I check textN and it has
all the lines until "242..")

when I try Nfile.write(textN) again it writes some more lines but
still not all!
what is wrong whit this?

Many thanks for your help!
Alex

the original file to crop (in path) looks like this:

*HEADING
ABAQUS-style file created by OOF2 on 2009-03-05 03:23:49.204607 from a
mesh of the microstructure A.
** Materials defined by OOF2:
**   C:
**   W:
** Master elements used in OOF2:
**   2: D2_2, Isoparametric 2-noded edge element
**   3: T3_3, Isoparametric 3 noded triangle with linear interpolation
for both fields and positions.
**   4: Q4_4, Isoparametric 4 noded quadrilateral with bilinear
interpolation for both positions and fields
** Boundary Conditions:
** Notes:
**   The set of nodes and elements may be different from the set
created from a skeleton
**    depending on the element type and if the mesh was refined.
**   The materials and boundary conditions provided by OOF2 may be
translated into ABAQUS by the user.
**   The element type provided below should be verified and modified
accordingly.
**   Only elements (and nodes of such elements) that have an
associated material are included in this file.
*NODE
6, 0.0, 0.0
1, 0.031365, 0.0
9, 0.06273, 0.0
10, 0.094095, 0.0
17, 0.12546, 0.0
18, 0.156825, 0.0
29, 0.18819, 0.0
33, 0.219555, 0.0
37, 0.25092, 0.0
38, 0.282285, 0.0
245, 0.31365, 0.0
4, 0.0, 0.027505735912
7, 0.0283153247289, 0.0247564240049
8, 0.06273, 0.0236123
13, 0.126933916405, 0.0219324392255
22, 0.156825, 0.0236123
25, 0.185442602873, 0.0174188364874
35, 0.216158167035, 0.0260087067213
41, 0.25092, 0.0236123
65, 0.31365, 0.0265806479154
45, 0.0, 0.0472246
44, 0.0270022417013, 0.0457250093507
46, 0.06273, 0.0472246
47, 0.0987777090467, 0.0476663143118
48, 0.123432920369, 0.0493041533953
50, 0.157517619392, 0.0491485665468
54, 0.18819, 0.0472246
56, 0.21829479153, 0.0489914989989
59, 0.255396164365, 0.053642386456
62, 0.283534894472, 0.0482125495477
66, 0.31365, 0.0473757108379
68, 0.0, 0.0708369
71, 0.031365, 0.0708369
73, 0.0667269869261, 0.0724057787737
74, 0.094095, 0.0708369
75, 0.122035555525, 0.0683265441516
77, 0.154069643632, 0.067833220225
79, 0.192676294482, 0.0697610582702
80, 0.218433034079, 0.0733140035725
81, 0.250592391777, 0.0705659765909
115, 0.31365, 0.0749934030765
86, 0.0, 0.0937712452856
87, 0.0327416679167, 0.0988320724937
92, 0.0642181016634, 0.0996865210439
94, 0.0939583966251, 0.0960413983543
98, 0.12277254344, 0.0956157005759
101, 0.156825, 0.0944492
107, 0.190080813107, 0.0989004943145
109, 0.219555, 0.0944492
111, 0.25092, 0.0944492
116, 0.31365, 0.0913902112346
117, 0.0, 0.118185969919
118, 0.031365, 0.1180615
119, 0.0657061477957, 0.117247512024
120, 0.0954076666726, 0.117579706786
122, 0.120457073874, 0.118852698163
125, 0.150412085671, 0.119805228459
128, 0.188401966746, 0.118578758447
132, 0.219555, 0.1180615
131, 0.25092, 0.1180615
134, 0.282285, 0.1180615
138, 0.0, 0.1416738
137, 0.031365, 0.1416738
139, 0.06273, 0.1416738
140, 0.0981318888408, 0.141731507791
160, 0.156825, 0.1416738
145, 0.18819, 0.1416738
144, 0.21849787291, 0.144222847202
146, 0.25214522485, 0.139721206044
147, 0.287968204391, 0.138882348861
151, 0.0, 0.1652861
152, 0.031365, 0.1652861
153, 0.06273, 0.1652861
154, 0.094095, 0.1652861
156, 0.124683249222, 0.165861357563
189, 0.156825, 0.1652861
163, 0.189978244061, 0.168552116135
193, 0.219555, 0.1652861
170, 0.251953134991, 0.166067888686
175, 0.31365, 0.1652861
179, 0.0, 0.1888984
178, 0.031365, 0.1888984
180, 0.06273, 0.1888984
181, 0.0948683944207, 0.186105991855
184, 0.12546, 0.1888984
185, 0.156825, 0.1888984
191, 0.185226863639, 0.189033619679
192, 0.21459450643, 0.190219519385
196, 0.248868626255, 0.189540639649
197, 0.277613280215, 0.188996385139
200, 0.31365, 0.188840621897
201, 0.0, 0.2125107
202, 0.031365, 0.2125107
203, 0.061560970472, 0.211435761567
206, 0.094095, 0.2125107
208, 0.123520746115, 0.217288884383
212, 0.156824305885, 0.210136954906
215, 0.19080765368, 0.21182785412
216, 0.219555, 0.2125107
217, 0.24652142594, 0.211374186361
219, 0.282347639617, 0.2121001649
220, 0.31365, 0.213088792923
222, 0.0, 0.236123
221, 0.031365, 0.236123
224, 0.06273, 0.236123
226, 0.094095, 0.236123
230, 0.12546, 0.236123
236, 0.156825, 0.236123
237, 0.18819, 0.236123
238, 0.219555, 0.236123
246, 0.25092, 0.236123
239, 0.282285, 0.236123
244, 0.31365, 0.236123
2, 0.0150409063102, 0.0175241129844
5, 0.0, 0.0143072034694
3, 0.0156825, 0.0
11, 0.0944401447071, 0.0170218543566
12, 0.108202138276, 0.0142655596685
14, 0.1097775, 0.0236123
16, 0.1097775, 0.0
15, 0.12546, 0.01180615
19, 0.1411425, 0.01180615
20, 0.137460594687, 0.0
23, 0.157190514557, 0.0120435227667
21, 0.1411425, 0.0236123
24, 0.1725075, 0.01180615
26, 0.1725075, 0.0236123
28, 0.174079024203, 0.0
27, 0.18819, 0.01180615
30, 0.20326319059, 0.0099544646677
31, 0.203137388716, 0.0
34, 0.217996940452, 0.0162543067349
32, 0.201648730844, 0.0253407563922
36, 0.25092, 0.01180615
39, 0.265091546036, 0.0115111489103
40, 0.265188659994, 0.0
43, 0.2979675, 0.0132903239577
42, 0.269085418102, 0.0219175315684
49, 0.14331614143, 0.0389180302184
51, 0.156825, 0.03541845
52, 0.170034925911, 0.0302540838763
55, 0.187241635364, 0.0308634812215
53, 0.170973146505, 0.0466686190136
57, 0.231749688431, 0.0405121944142
t60, 0.250420691759, 0.0399644155193
58, 0.234883810317, 0.0488399925217
61, 0.2666025, 0.03541845
63, 0.261841754198, 0.0453458988094
64, 0.283647280911, 0.0331311643709
67, 0.00997528838099, 0.059251007707
70, 0.026431195612, 0.0585429396298
69, 0.0156825, 0.0708369
72, 0.0470475, 0.0708369
76, 0.1411425, 0.0708369
104, 0.172905294963, 0.0687591528112
78, 0.189370395463, 0.0578988574842
82, 0.262145728385, 0.0567820182347
84, 0.282965777504, 0.0591653776972
83, 0.265510384054, 0.0711987638019
85, 0.0139070458991, 0.0765358149114
88, 0.031365, 0.08264305
89, 0.0463012651661, 0.0875761693955
91, 0.0595508652878, 0.083794762795
90, 0.0521108640296, 0.100487743127
93, 0.0784125, 0.08264305
95, 0.0759417426685, 0.094062139992
97, 0.125079439202, 0.0851866737525
96, 0.113088578118, 0.0953941670146
99, 0.143620352067, 0.0847078895557
100, 0.141046495561, 0.096007596875
102, 0.155098055673, 0.0796347264443
103, 0.172456234293, 0.0843806927744
106, 0.192866733648, 0.0862017124287
105, 0.175478179057, 0.0961076917822
108, 0.206360054844, 0.0816320301498
110, 0.203328294152, 0.0983508749474
112, 0.265850130274, 0.0841722754528
113, 0.283000506379, 0.0840718733578
114, 0.303036176529, 0.0912194545513
121, 0.111243800079, 0.102959886527
123, 0.12546, 0.10625535
124, 0.145186532288, 0.106177357559
126, 0.156825, 0.10625535
127, 0.177405333868, 0.10909704185
129, 0.1725075, 0.1180615
130, 0.18819, 0.10625535
133, 0.284435184261, 0.103796377701
136, 0.300997320603, 0.104240413217
135, 0.31365, 0.109425841822
141, 0.111351058915, 0.124763865227
143, 0.122330041541, 0.130632700189
142, 0.112021299889, 0.141456280139
243, 0.156825, 0.12986765
166, 0.174585056762, 0.136596948305
148, 0.2979675, 0.12986765
149, 0.31365, 0.132737078008
150, 0.302337133041, 0.140742193464
155, 0.110958484372, 0.156488764047
157, 0.123506443041, 0.151563704181
158, 0.138959817302, 0.151649897722
161, 0.158211487404, 0.158307767024
159, 0.140308231574, 0.169185557451
162, 0.174346818609, 0.14887558308
164, 0.176749514131, 0.168899157395
165, 0.18819, 0.15347995
167, 0.2038725, 0.15347995
169, 0.218436569511, 0.154768432689
168, 0.20646420232, 0.163454153961
172, 0.2352375, 0.15347995
171, 0.2352375, 0.1652861
174, 0.282285, 0.15347995
173, 0.299052995126, 0.151252115601
176, 0.296157702422, 0.164094288997
177, 0.31365, 0.147922235167
183, 0.12546, 0.17709225
182, 0.115020521952, 0.189065620836
187, 0.143150811124, 0.176461278361
186, 0.138367010451, 0.187435512478
188, 0.156825, 0.17709225
190, 0.174773303996, 0.179131868025
194, 0.223398006386, 0.175796432928
195, 0.2352375, 0.17709225
198, 0.283410759935, 0.175681933912
199, 0.295448251155, 0.176846292296
204, 0.0922385576628, 0.201463078266
205, 0.078759504717, 0.208169638245
207, 0.107329430815, 0.199650268966
209, 0.107340529686, 0.214649306608
210, 0.126314562813, 0.196624227919
211, 0.137598251382, 0.200265546052
213, 0.143355236652, 0.21294448339
214, 0.1725075, 0.2125107
218, 0.263507995658, 0.208989696919
223, 0.06273, 0.22431685
225, 0.0720254659882, 0.221339169391
227, 0.0784125, 0.236123
228, 0.0983042590694, 0.222777379368
229, 0.107905816156, 0.231588924845
231, 0.128500216507, 0.22426970333
232, 0.1411425, 0.22431685
233, 0.145352032138, 0.236123
234, 0.160670487099, 0.221709277836
235, 0.173524670602, 0.224567595595
241, 0.265582570598, 0.221943044414
240, 0.264044860278, 0.236123
242, 0.2979675, 0.224605896461
** The OOF2 element type is T3_3. The type provided for ABAQUS is only
a guess
** and may have to be modified by the user to be meaningful.
*ELEMENT, TYPE=CPS3
1, 1, 2, 3
2, 4, 5, 2
3, 6, 3, 5
4, 2, 5, 3
5, 2, 7, 4
6, 2, 1, 7
7, 1, 8, 7
8, 8, 1, 9
9, 10, 8, 9
10, 11, 8, 10
11, 10, 12, 11
12, 13, 14, 12
13, 12, 14, 11
14, 13, 12, 15
15, 10, 16, 12
16, 17, 15, 16
17, 12, 16, 15
18, 18, 19, 20
19, 17, 20, 15
20, 19, 15, 20
21, 13, 19, 21
22, 22, 21, 23
23, 19, 23, 21
24, 18, 24, 23
25, 25, 26, 24
26, 22, 23, 26
27, 24, 26, 23
28, 25, 24, 27
29, 18, 28, 24
30, 29, 27, 28
31, 24, 28, 27
32, 25, 27, 30
33, 30, 27, 31
34, 25, 30, 32
35, 33, 34, 30
36, 35, 32, 34
37, 36, 33, 37
38, 38, 39, 40
39, 41, 36, 39
40, 37, 40, 36
41, 39, 36, 40
42, 41, 39, 42
43, 38, 43, 39
44, 39, 43, 42
45, 4, 44, 45
46, 44, 4, 7
47, 8, 44, 7
48, 44, 8, 46
49, 8, 47, 46
50, 14, 13, 47
51, 47, 13, 48
52, 49, 48, 13
53, 49, 50, 48
54, 50, 49, 51
55, 13, 21, 49
56, 22, 51, 21
57, 49, 21, 51
58, 50, 52, 53
59, 54, 53, 55
60, 55, 56, 54
61, 32, 35, 56
62, 57, 56, 35
63, 56, 57, 58
64, 59, 58, 60
65, 57, 60, 58
66, 41, 61, 60
67, 62, 63, 61
68, 59, 60, 63
69, 61, 63, 60
70, 62, 61, 64
71, 41, 42, 61
72, 61, 42, 64
73, 64, 65, 62
74, 62, 65, 66
75, 67, 45, 44
76, 67, 68, 45
77, 68, 67, 69
78, 44, 70, 67
79, 71, 69, 70
80, 67, 70, 69
81, 72, 71, 70
82, 72, 70, 44
83, 47, 73, 46
84, 73, 47, 74
85, 47, 75, 74
86, 75, 47, 48
87, 50, 75, 48
88, 76, 50, 77
89, 76, 75, 50
90, 78, 56, 79
91, 78, 54, 56
92, 79, 56, 80
93, 56, 81, 80
94, 58, 81, 56
95, 58, 59, 81
96, 59, 82, 81
97, 59, 63, 82
98, 63, 62, 82
99, 81, 82, 83
100, 62, 84, 82
101, 82, 84, 83
102, 85, 86, 68
103, 85, 87, 86
104, 87, 85, 88
105, 68, 69, 85
106, 73, 89, 72
107, 87, 88, 89
108, 71, 72, 88
109, 89, 88, 72
110, 87, 89, 90
111, 73, 91, 89
112, 92, 90, 91
113, 89, 91, 90
114, 73, 93, 91
115, 94, 95, 93
116, 92, 91, 95
117, 93, 95, 91
118, 93, 74, 94
119, 93, 73, 74
120, 75, 94, 74
121, 75, 96, 94
122, 75, 97, 96
123, 97, 98, 96
124, 75, 99, 97
125, 98, 97, 100
126, 99, 100, 97
127, 101, 99, 102
128, 75, 76, 99
129, 77, 102, 76
130, 99, 76, 102
131, 79, 103, 104
132, 101, 102, 103
133, 77, 104, 102
134, 101, 103, 105
135, 79, 106, 103
136, 107, 105, 106
137, 79, 108, 106
138, 109, 110, 108
139, 107, 106, 110
140, 108, 110, 106
141, 108, 80, 109
142, 108, 79, 80
143, 81, 109, 80
144, 109, 81, 111
145, 112, 111, 81
146, 81, 83, 112
147, 112, 83, 113
148, 114, 115, 116
149, 87, 117, 86
150, 117, 87, 118
151, 87, 119, 118
152, 90, 119, 87
153, 90, 92, 119
154, 95, 119, 92
155, 95, 94, 119
156, 119, 94, 120
157, 121, 120, 94
158, 121, 122, 120
159, 122, 121, 123
160, 94, 96, 121
161, 98, 123, 96
162, 121, 96, 123
163, 101, 124, 100
164, 122, 123, 124
165, 98, 100, 123
166, 124, 123, 100
167, 122, 124, 125
168, 124, 101, 126
169, 124, 126, 125
170, 101, 127, 126
171, 128, 129, 127
172, 125, 126, 129
173, 127, 129, 126
174, 128, 127, 130
175, 101, 105, 127
176, 107, 130, 105
177, 127, 105, 130
178, 128, 130, 110
179, 130, 107, 110
180, 109, 131, 132
181, 131, 109, 111
182, 133, 134, 131
183, 116, 135, 114
184, 136, 114, 135
185, 117, 137, 138
186, 137, 117, 118
187, 119, 137, 118
188, 137, 119, 139
189, 119, 140, 139
190, 140, 119, 120
191, 141, 120, 122
192, 141, 140, 120
193, 140, 141, 142
194, 122, 143, 141
195, 141, 143, 142
196, 128, 144, 145
197, 144, 128, 132
198, 131, 144, 132
199, 144, 131, 146
200, 131, 147, 146
201, 147, 131, 134
202, 148, 149, 150
203, 137, 151, 138
204, 151, 137, 152
205, 137, 153, 152
206, 153, 137, 139
207, 140, 153, 139
208, 153, 140, 154
209, 155, 154, 140
210, 155, 156, 154
211, 156, 155, 157
212, 140, 142, 155
213, 155, 142, 157
214, 158, 156, 157
215, 156, 158, 159
216, 160, 161, 158
217, 158, 161, 159
218, 160, 162, 161
219, 163, 164, 162
220, 163, 162, 165
221, 145, 165, 166
222, 162, 166, 165
223, 144, 167, 145
224, 167, 163, 165
225, 167, 165, 145
226, 163, 167, 168
227, 167, 169, 168
228, 170, 171, 172
229, 172, 146, 170
230, 172, 144, 146
231, 147, 173, 174
232, 175, 176, 173
233, 173, 176, 174
234, 175, 173, 177
235, 173, 150, 177
236, 151, 178, 179
237, 178, 151, 152
238, 153, 178, 152
239, 178, 153, 180
240, 153, 181, 180
241, 181, 153, 154
242, 156, 181, 154
243, 156, 182, 181
244, 156, 183, 182
245, 183, 184, 182
246, 185, 186, 187
247, 184, 183, 186
248, 187, 186, 183
249, 185, 187, 188
250, 189, 188, 159
251, 187, 159, 188
252, 163, 190, 164
253, 185, 188, 190
254, 189, 164, 188
255, 190, 188, 164
256, 190, 191, 185
257, 190, 163, 191
258, 163, 192, 191
259, 163, 168, 192
260, 168, 193, 194
261, 168, 194, 192
262, 170, 195, 171
263, 192, 194, 195
264, 193, 171, 194
265, 195, 194, 171
266, 195, 196, 192
267, 195, 170, 196
268, 170, 197, 196
269, 198, 197, 170
270, 175, 199, 176
271, 197, 198, 199
272, 199, 198, 176
273, 199, 200, 197
274, 199, 175, 200
275, 178, 201, 179
276, 201, 178, 202
277, 178, 203, 202
278, 203, 178, 180
279, 181, 204, 205
280, 204, 206, 205
281, 181, 207, 204
282, 208, 209, 207
283, 206, 204, 209
284, 207, 209, 204
285, 208, 207, 210
286, 181, 182, 207
287, 184, 210, 182
288, 207, 182, 210
289, 185, 211, 186
290, 208, 210, 211
291, 184, 186, 210
292, 211, 210, 186
293, 212, 211, 185
294, 212, 213, 211
295, 213, 208, 211
296, 214, 185, 215
297, 214, 212, 185
298, 215, 185, 191
299, 192, 215, 191
300, 215, 192, 216
301, 192, 217, 216
302, 217, 192, 196
303, 218, 197, 219
304, 197, 220, 219
305, 220, 197, 200
306, 201, 221, 222
307, 221, 201, 202
308, 223, 224, 221
309, 203, 225, 223
310, 226, 227, 225
311, 224, 223, 227
312, 225, 227, 223
313, 226, 225, 228
314, 203, 205, 225
315, 206, 228, 205
316, 225, 205, 228
317, 208, 229, 209
318, 226, 228, 229
319, 206, 209, 228
320, 229, 228, 209
321, 226, 229, 230
322, 229, 208, 231
323, 229, 231, 230
324, 208, 232, 231
325, 230, 231, 233
326, 232, 233, 231
327, 208, 213, 232
328, 232, 213, 234
329, 215, 235, 214
330, 236, 234, 235
331, 212, 214, 234
332, 235, 234, 214
333, 235, 237, 236
334, 235, 215, 237
335, 215, 238, 237
336, 238, 215, 216
337, 217, 238, 216
338, 239, 240, 241
339, 239, 241, 242
340, 217, 218, 241
341, 219, 242, 218
342, 241, 218, 242
343, 242, 219, 220
344, 84, 115, 113
345, 113, 83, 84
346, 159, 183, 156
347, 159, 187, 183
348, 243, 160, 143
349, 177, 150, 149
350, 32, 55, 25
351, 32, 56, 55
352, 113, 115, 114
353, 143, 157, 142
354, 160, 158, 143
355, 158, 157, 143
356, 52, 22, 26
357, 52, 51, 22
358, 218, 196, 197
359, 218, 217, 196
360, 36, 34, 33
361, 36, 41, 34
362, 128, 166, 129
363, 160, 243, 166
364, 166, 243, 129
365, 145, 166, 128
366, 110, 132, 128
367, 110, 109, 132
368, 198, 170, 174
369, 174, 176, 198
370, 34, 57, 35
371, 34, 41, 57
372, 223, 202, 203
373, 223, 221, 202
374, 47, 8, 11
375, 14, 47, 11
376, 84, 66, 115
377, 84, 62, 66
378, 205, 180, 181
379, 205, 203, 180
380, 72, 46, 73
381, 72, 44, 46
382, 125, 143, 122
383, 125, 243, 143
384, 133, 131, 111
385, 133, 114, 136
386, 113, 114, 133
387, 112, 133, 111
388, 242, 244, 239
389, 242, 220, 244
390, 43, 245, 65
391, 43, 38, 245
392, 241, 240, 246
393, 246, 238, 217
394, 217, 241, 246
395, 64, 43, 65
396, 43, 64, 42
397, 26, 55, 52
398, 26, 25, 55
399, 85, 71, 88
400, 85, 69, 71
401, 174, 146, 147
402, 174, 170, 146
403, 50, 104, 77
404, 79, 104, 78
405, 50, 53, 104
406, 104, 53, 78
** Point boundaries in OOF2
*NSET, NSET=topleft
222
*NSET, NSET=bottomleft
6
*NSET, NSET=topright
244
*NSET, NSET=bottomright
245
** Edge boundaries in OOF2
*NSET, NSET=top
244, 239, 240, 246, 238, 237, 236, 233, 230, 226, 227, 224, 221, 222
*NSET, NSET=right
245, 65, 66, 115, 116, 135, 149, 177, 175, 200, 220, 244
*NSET, NSET=left
222, 201, 179, 151, 138, 117, 86, 68, 45, 4, 5, 6
*NSET, NSET=bottom
6, 3, 1, 9, 10, 16, 17, 20, 18, 28, 29, 31, 33, 37, 40, 38,
245
*ELSET, ELSET=C
21, 55, 57, 77, 105, 109, 111, 115, 117, 160, 161, 162, 165, 212, 213,
232,
271, 272, 290, 291, 292, 399, 400
*SOLID SECTION, ELSET=C, MATERIAL=C
*ELSET, ELSET=W
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33,
34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49,
50, 51, 52, 53, 54, 56, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67,
68, 69, 70, 71, 72, 73, 74, 75, 76, 78, 79, 80, 81, 82, 83, 84,
85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100,
101, 102, 103, 104, 106, 107, 108, 110, 112, 113, 114, 116, 118, 119,
120, 121,
122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135,
136, 137,
138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151,
152, 153,
154, 155, 156, 157, 158, 159, 163, 164, 166, 167, 168, 169, 170, 171,
172, 173,
174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187,
188, 189,
190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203,
204, 205,
206, 207, 208, 209, 210, 211, 214, 215, 216, 217, 218, 219, 220, 221,
222, 223,
224, 225, 226, 227, 228, 229, 230, 231, 233, 234, 235, 236, 237, 238,
239, 240,
241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254,
255, 256,
257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270,
273, 274,
275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288,
289, 293,
294, 295, 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307,
308, 309,
310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323,
324, 325,
326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339,
340, 341,
342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355,
356, 357,
358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371,
372, 373,
374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387,
388, 389,
390, 391, 392, 393, 394, 395, 396, 397, 398, 401, 402, 403, 404, 405,
406
*SOLID SECTION, ELSET=W, MATERIAL=W
*MATERIAL, NAME=C
** Use the information in the header to complete these fields under
MATERIAL
*MATERIAL, NAME=W
** Use the information in the header to complete these fields under
MATERIAL


From heintest at web.de  Sun May 24 14:47:24 2009
From: heintest at web.de (=?ISO-8859-1?Q?Hans_M=FCller?=)
Date: Sun, 24 May 2009 20:47:24 +0200
Subject: Can I get a technical explanation on the following error
In-Reply-To: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
Message-ID: <4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>

Try this:

print "\\"

\ is the escape character, it masks the meaning of the next chararcter.

If you write print "\" python tries to print " (the meaning of " as
the string delimiter is beeing masked) and finds no closing "
This is why you got the error.

hth.

Greetings
Hans


From dasdasich at googlemail.com  Sun May 24 14:48:59 2009
From: dasdasich at googlemail.com (DasIch)
Date: Sun, 24 May 2009 20:48:59 +0200
Subject: Can I get a technical explanation on the following error
In-Reply-To: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
Message-ID: <200905242048.59288.dasdasich@googlemail.com>

'\' starts a escape sequence. You need to escape '\' with a '\' to make it 
work. 
>>> print 'test \\'
test \



From bottleh20 at gmail.com  Sun May 24 14:56:04 2009
From: bottleh20 at gmail.com (Water Bottle)
Date: Sun, 24 May 2009 14:56:04 -0400
Subject: Problems with StaticBitmaps and events
In-Reply-To: <c8a21b110905231432q175a3ebay8111f4cf37dc4977@mail.gmail.com>
References: <c8a21b110905231432q175a3ebay8111f4cf37dc4977@mail.gmail.com>
Message-ID: <c8a21b110905241156n6ae94d6bnbcb643f5d80979f@mail.gmail.com>

Okay, I found the root of the weird box problem on the top left corner. It
has something to do with my panels. I changed the code so that I directly
used the StaticBitmap and TextCtrl inside the Frame class and the weird box
was gone. I'm not sure what I'm doing wrong with the Panels. Can anyone
help?

Also, I poked around other forums and it seems StaticBitmaps doesn't really
trigger events (it's a static control). I tried using GenStaticBitmaps in
the wx.lib.statbmp, and was able to achieve some triggers (for example,
wx.EVT_ENTER_WINDOW). However, I want to make it so that my picture is a
button without having to look like one of the standard looking buttons (like
you have in wx.BitmapButton). Is there some sort of way to do that?

Thanks.
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From python.list at tim.thechases.com  Sun May 24 15:20:04 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 24 May 2009 14:20:04 -0500
Subject: I need help building a data structure for a state diagram
In-Reply-To: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>
References: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>
Message-ID: <4A199DE4.807@tim.thechases.com>

> I'm working on a really simple workflow for my bug tracker.  I want
> filed bugs to start in an UNSTARTED status.  From there, they can go to
> STARTED.
> 
>>From STARTED, bugs can go to FINISHED or ABANDONED.
> 
> I know I can easily hard-code this stuff into some if-clauses, but I
> expect to need to add a lot more statuses over time and a lot more
> relationships.
> 
> This seems like a crude state diagram.  So, has anyone on this list done
> similar work?

I've got a similar workflow in one of my applications at work.  I 
use a database to persist the available states along with their 
transitions.  Both the states themselves and the transitions have 
various attributes to them to facilitate my workflows.  The 
following schema should work in most databases such as sqlite 
(included with Python2.5+) with minor syntactic tweaks (such as 
auto-increment)

   CREATE TABLE States (
    id INT PRIMARY KEY AUTOINCREMENT,
    description VARCHAR(50),
    other_attributes ...
   );

   CREATE TABLE Transitions (
    id INT PRIMARY KEY AUTOINCREMENT,
    from_state INT NOT NULL REFERENCES States(id),
    to_state INT NOT NULL REFERENCES States(id),
    other_attributes ...
   );
   INSERT INTO States (description) VALUES
    ('Started'),
    ('Finished'),
    ('Abandoned');
   INSERT INTO Transitions (from_state, to_state) VALUES
    (1, 2), -- Started -> Finished
    (1, 3), -- Started -> Abandoned
    (3, 2);  -- Abandoned -> Finished

You can then query states you can transition to:

   SELECT s1.description, s2.description, t.other_attributes
   FROM Transitions t
   INNER JOIN States s1
   ON s1.id = t.from_id
   INNER JOIN States s2
   ON s2.id = t.to_id
   -- WHERE t.from_id = @current_id
   ORDER BY s1.description, s2.description


You can easily add more state rows as well as transition rows to 
the tables.  Then use the other_attributes of either the 
transition or the state to control the workflows (we have 
transition attributes for things like "notifies account-manager", 
"notifies customer", "number of days that must pass from initial 
workflow-start", "number of days that must pass from most recent 
status change", "does this transition happen manually or 
automatically via an overnight script", etc.)  The workflow 
processing code then looks at these attributes for the transition 
that's being attempted, and behaves accordingly.

Hope this gives you some ideas.  If you want to read more, the 
magic google-words are "finite state automaton" (FSA) or "finite 
state machine" (FSM)[1]

-tkc

[1]
http://en.wikipedia.org/wiki/Finite_state_machine








From bottleh20 at gmail.com  Sun May 24 15:30:31 2009
From: bottleh20 at gmail.com (Water Bottle)
Date: Sun, 24 May 2009 15:30:31 -0400
Subject: Problems with StaticBitmaps and events
In-Reply-To: <c8a21b110905231432q175a3ebay8111f4cf37dc4977@mail.gmail.com>
References: <c8a21b110905231432q175a3ebay8111f4cf37dc4977@mail.gmail.com>
Message-ID: <c8a21b110905241230p449941ddp35d141aa4426368@mail.gmail.com>

Hm, so it seems that it was just a sizing issue with my wx.Panels. I defined
my own size, and that fixed the weird box problem. Although, now that I'm
defining the size, that may not be good for when I expand the window.
Everything will be stretched. Anyone know a way around that?

Still having trouble with the GenStaticBitmap and the events. Can't seem to
find an event that uses 'clickable' as a trigger (like EVT_BUTTON, but that
doesn't work with GenStaticBitmap)
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From kay at fiber-space.de  Sun May 24 15:42:01 2009
From: kay at fiber-space.de (Kay Schluehr)
Date: Sun, 24 May 2009 12:42:01 -0700 (PDT)
Subject: I need help building a data structure for a state diagram
References: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>
Message-ID: <89cbdfa9-2107-47c3-900c-ac0b574614a3@r37g2000yqd.googlegroups.com>

On 24 Mai, 20:16, Matthew Wilson <m... at tplus1.com> wrote:
> I'm working on a really simple workflow for my bug tracker. ?I want
> filed bugs to start in an UNSTARTED status. ?From there, they can go to
> STARTED.
>
> From STARTED, bugs can go to FINISHED or ABANDONED.
>
> I know I can easily hard-code this stuff into some if-clauses, but I
> expect to need to add a lot more statuses over time and a lot more
> relationships.
>
> This seems like a crude state diagram. ?So, has anyone on this list done
> similar work?
>
> How should I design this so that users can add arbitrary new statuses
> and then define how to get to and from those statuses?
>
> TIA
>
> MAtt

General answer: you can encode finite state machines as grammars.
States as non-terminals and transition labels as terminals:

UNSTARTED: 'start' STARTED
STARTED: 'ok' FINISHED | 'cancel' ABANDONED
ABANDONED: 'done'
FINISHED: 'done'

In some sense each state-machine is also a little language.


From cdalten at gmail.com  Sun May 24 16:14:44 2009
From: cdalten at gmail.com (grocery_stocker)
Date: Sun, 24 May 2009 13:14:44 -0700 (PDT)
Subject: Can I get a technical explanation on the following error
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
	<4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>

On May 24, 11:47 am, Hans M?ller <heint... at web.de> wrote:
> Try this:
>
> print "\\"
>
> \ is the escape character, it masks the meaning of the next chararcter.
>
> If you write print "\" python tries to print " (the meaning of " as
> the string delimiter is beeing masked) and finds no closing "
> This is why you got the error.
>

So something like

"\"

changes the meaning of " ? How? Does it just shift the ASCII bit(s)?


From bsk16 at case.edu  Sun May 24 16:15:15 2009
From: bsk16 at case.edu (Benjamin Kaplan)
Date: Sun, 24 May 2009 16:15:15 -0400
Subject: writing on file not until the end
In-Reply-To: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
Message-ID: <ec96e1390905241315x56dea631r94595b4b52c9f2ba@mail.gmail.com>

On Sun, May 24, 2009 at 2:46 PM, Alexzive <zasaconsulting at gmail.com> wrote:

> Hello,
> I am a newby with python. I wrote the following code to extract a text
> from a file and write it to another file:
>
> linestring = open(path, 'r').read() #read all the inp file in
> linestring
>
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)
>
> unfortunately when I check N.txt some lines are missing (it only crop
> until "57, 0.231749688431, 0.0405121944142" but I espect the final
> line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> all the lines until "242..")
>
> when I try Nfile.write(textN) again it writes some more lines but
> still not all!
> what is wrong whit this?
>
> Many thanks for your help!
> Alex
>
> the original file to crop (in path) looks like this:


[snip file]

I didn't test this, but I would guess you're seeing this because of
buffering. Try adding Nfile.flush() to the end.
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From clp2 at rebertia.com  Sun May 24 16:24:09 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 24 May 2009 13:24:09 -0700
Subject: Can I get a technical explanation on the following error
In-Reply-To: <1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
	<4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>
	<1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
Message-ID: <50697b2c0905241324l6b30e0cs22e0ca4edd46df34@mail.gmail.com>

On Sun, May 24, 2009 at 1:14 PM, grocery_stocker <cdalten at gmail.com> wrote:
> On May 24, 11:47 am, Hans M?ller <heint... at web.de> wrote:
>> Try this:
>>
>> print "\\"
>>
>> \ is the escape character, it masks the meaning of the next chararcter.
>>
>> If you write print "\" python tries to print " (the meaning of " as
>> the string delimiter is beeing masked) and finds no closing "
>> This is why you got the error.
>>
>
> So something like
>
> "\"
>
> changes the meaning of " ? How? Does it just shift the ASCII bit(s)?

No, the Python parser handles it when it parses string literals.

Cheers,
Chris
-- 
http://blog.rebertia.com


From basti.wiesner at gmx.net  Sun May 24 16:37:03 2009
From: basti.wiesner at gmx.net (Sebastian Wiesner)
Date: Sun, 24 May 2009 22:37:03 +0200
Subject: LaTeXing python programs
References: <de5ece1a-4e80-4ed6-81fb-57241b369adf@z19g2000vbz.googlegroups.com>
	<mailman.461.1242845176.8015.python-list@python.org>
	<i8udnbmVfdskxYnXnZ2dnUVZ_tBi4p2d@rcn.net>
	<mailman.465.1242853870.8015.python-list@python.org>
	<bdd7618d-53a4-48f8-bd0d-8a218d766c5a@n21g2000vba.googlegroups.com>
Message-ID: <gvcb5b$sfv$1@hoshi.visyn.net>

<Edward Grefenstette ? Donnerstag, 21. Mai 2009 00:27>

> On May 20, 10:10 pm, John Reid <j.r... at mail.cryst.bbk.ac.uk> wrote:
>> Alan G Isaac wrote:
>> > The listings package is great and highly configurable.
>> > Note that you can also input entire files of Python code
>> > or pieces of them based on markers.  Really quite great.
>>
>> I tried listings. I believe pygments makes better formatted output (at
>> least out of the box).
> 
> I'm trying to figure out how to use pygments. Are there any good usage
> examples out there?

It's not really difficult.   First choose a pygments style and create the 
latex definitions for it (STYLENAME serves as placeholder here):

pygmentize -S STYLENAME -f latex > pygments_style.tex

Now import the required packages and the style definitions:

\usepackage{color]
\usepackage{fancyvbr}
\input{pygments_style.tex}

These packages are included in Tetex as well as in Texlive, if not, you can 
of course install them from CTAN.

To format a snippet of code, run pygmentize and copy the output into your 
document:

pygmentize -f latex a_python_file.py

That's it.

-- 
Freedom is always the freedom of dissenters.
                                      (Rosa Luxemburg)



From davea at dejaviewphoto.com  Sun May 24 17:19:29 2009
From: davea at dejaviewphoto.com (Dave Angel)
Date: Sun, 24 May 2009 17:19:29 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <gvas9k$vvf$1@lust.ihug.co.nz>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.525.1242941777.8015.python-list@python.org>
	<gvas9k$vvf$1@lust.ihug.co.nz>
Message-ID: <4A19B9E1.9060005@dejaviewphoto.com>

Lawrence D'Oliveiro wrote:
> In message <mailman.525.1242941777.8015.python-list at python.org>, Christian 
> Heimes wrote:
>
>   
>> Welcome to IEEE 754 floating point land! :)
>>     
>
> It used to be worse in the days before IEEE 754 became widespread. Anybody 
> remember a certain Prof William Kahan from Berkeley, and the foreword he 
> wrote to the Apple Numerics Manual, 2nd Edition, published in 1988? It's 
> such a classic piece that I think it should be posted somewhere...
>
>
>   
I remember the professor.  He was responsible for large parts of the 
Intel 8087 specification, which later got mostly codified as IEEE 754.  
In those days, the 8087 was a couple hundred extra dollars, so few 
machines had one.  And the software simulation was horribly slow (on a 
4.7 mhz machine).  So most compilers would have two math libraries.  If 
you wanted 8087 equivalence, and the hardware wasn't there, it was dog 
slow.  On the other hand, if you specified the other math package, it 
didn't benefit at all from the presence of the 8087.




From rhodri at wildebst.demon.co.uk  Sun May 24 17:36:10 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sun, 24 May 2009 22:36:10 +0100
Subject: Can I get a technical explanation on the following error
In-Reply-To: <1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
	<4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>
	<1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
Message-ID: <op.uugeakgia8ncjz@gnudebst>

On Sun, 24 May 2009 21:14:44 +0100, grocery_stocker <cdalten at gmail.com>  
wrote:

> On May 24, 11:47 am, Hans M?ller <heint... at web.de> wrote:
>> Try this:
>>
>> print "\\"
>>
>> \ is the escape character, it masks the meaning of the next chararcter.
>>
>> If you write print "\" python tries to print " (the meaning of " as
>> the string delimiter is beeing masked) and finds no closing "
>> This is why you got the error.
>>
>
> So something like
>
> "\"
>
> changes the meaning of " ? How? Does it just shift the ASCII bit(s)?

No.  There is a fixed set of "escape sequences" as they're called.
The Fine Manual lists them here:

http://docs.python.org/reference/lexical_analysis.html#literals

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From davea at dejaviewphoto.com  Sun May 24 17:54:57 2009
From: davea at dejaviewphoto.com (Dave Angel)
Date: Sun, 24 May 2009 17:54:57 -0400
Subject: Set a variable as in setter
In-Reply-To: <df8b1d7a-c3ba-405a-aeb9-c57f74d552fc@g37g2000yqn.googlegroups.com>
References: <5b000d42-c50f-410d-9e95-637b36899e71@d14g2000yql.googlegroups.com>	<Xns9C1588DDA9E0Eduncanbooth@127.0.0.1>
	<df8b1d7a-c3ba-405a-aeb9-c57f74d552fc@g37g2000yqn.googlegroups.com>
Message-ID: <4A19C231.9050809@dejaviewphoto.com>

Kless wrote:
> On 24 mayo, 12:27, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
>   
>> Kless <jonas.... at googlemail.com> wrote:
>>     
>>> Is there any way to simplify the next code? Because I'm setting a
>>> variable by default of the same way than it's set in the setter.
>>>       
>>> -------------------
>>> class Foo(object):
>>>    def __init__(self, bar):
>>>       self._bar =elf._change(bar)  # !!! as setter
>>>       
>> What's wrong with just doing this?:
>>         self.bar =ar
>>     
>
> Because 'bar' is going to be modified before of be saved.
>
>   
You can't modify bar, it's immutable (string).

Did you try the suggestion, or just assume it won't work?  self.bar will 
call your setter method just as well from __init__() as it does outside 
the class.  So that eliminates the need for a separate _change() method.

class Foo(object):
    def __init__(self, bar):
        self.bar = bar

    @property
    def bar(self):
        return self._bar

    @bar.setter
    def bar(self, text):
        self._bar = text + "any change"



From rhodri at wildebst.demon.co.uk  Sun May 24 17:55:48 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sun, 24 May 2009 22:55:48 +0100
Subject: writing on file not until the end
In-Reply-To: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
Message-ID: <op.uuge7ayqa8ncjz@gnudebst>

On Sun, 24 May 2009 19:46:01 +0100, Alexzive <zasaconsulting at gmail.com>  
wrote:

> Hello,
> I am a newby with python. I wrote the following code to extract a text
> from a file and write it to another file:
>
> linestring = open(path, 'r').read() #read all the inp file in
> linestring
>
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)
>
> unfortunately when I check N.txt some lines are missing (it only crop
> until "57, 0.231749688431, 0.0405121944142" but I espect the final
> line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> all the lines until "242..")
>
> when I try Nfile.write(textN) again it writes some more lines but
> still not all!
> what is wrong whit this?

Cutting and pasting (and substituting the sample file for `path`),
it works for me on Python 2.6.2 (Ubuntu Linux).  It must be something
to do with the context you're calling the code in.  Are you checking
the output before the program has finished running or something?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gregory.matous at gmail.com  Sun May 24 18:01:14 2009
From: gregory.matous at gmail.com (Dutch Masters)
Date: Sun, 24 May 2009 15:01:14 -0700 (PDT)
Subject: How does Python's OOP feel?
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
Message-ID: <cc164551-464d-4994-a722-7ac39e9e9b9d@j18g2000yql.googlegroups.com>

On May 24, 5:54?am, Ikon <vad.vik... at gmail.com> wrote:
Be prepared for a slight wave of depression as you remember all the
pointless interfaces, abstract classes, and getters/setters you
created. I keep reminding myself that Java pays the bills.

Having said that, the dynamic nature of Python lets you experiment
with some more advanced OO concepts that Java doesn't have, like
mixins (like multiple inheritance) and multimethods (dispatching on
parameter types). Then there are metaclasses..



From sjmachin at lexicon.net  Sun May 24 18:07:36 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 24 May 2009 15:07:36 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org> 
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com> 
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com>
Message-ID: <73631ab6-ab2a-4b21-928c-f7690d6e8e00@j18g2000prm.googlegroups.com>

On May 25, 3:09?am, pythoncuri... at gmail.com wrote:
> On May 24, 3:58?pm, John Machin <sjmac... at lexicon.net> wrote:
>
>
>
> > What problems? Like avoiding having to recompile your .py files makes
> > your app run too fast?
>
> There are real problems with this. I'm having similar problems when
> switching
> between Solaris and Windows.
> The code is in clearcase, which uses some sort of network file
> system.
> In our case, that means that I'll be accessing the same directories
> from both
> platforms, so .pyc-files from one platform will be visible when I run
> the
> code on the other platform.

"switching" scarcely seems to be the right description. You appear to
be running the same code from one repository simultaneously available
to two different platforms.

Try this: Instead of running your code straight from your repository,
set up a run-time "launch pad" in an appropriate place for each
platform. When there is a new release of your app, install it in each
launchpad.



>
> The .pyc-file will contain a string pointing to the file is was built
> from.
> The path to that file will be different under different platforms, so
> when the
> string is used, there will be error printouts.
> At least I think that's the problem, the error printouts contains
> paths that
> are only valid on the other platform.
> I don't have access to those computers atm, so I can't show the exact
> message.
>
> The only solution I've seen is to make sure to clean up the .pyc files
> each
> time I switch platform.

I'm a bit lost here ... your clearcase repository uses a mysterious
"some sort of network file system" to which you have access
permissions which allow you to delete individual files??


From davea at ieee.org  Sun May 24 18:08:33 2009
From: davea at ieee.org (Dave Angel)
Date: Sun, 24 May 2009 18:08:33 -0400
Subject: how to get rid of pyc files ?
In-Reply-To: <26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com>
References: <mailman.658.1243170106.8015.python-list@python.org>
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com>
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com>
Message-ID: <4A19C561.40705@ieee.org>

pythoncurious at gmail.com wrote:
> On May 24, 3:58 pm, John Machin <sjmac... at lexicon.net> wrote:
>   
>> What problems? Like avoiding having to recompile your .py files makes
>> your app run too fast?
>>
>>     
>
> There are real problems with this. I'm having similar problems when
> switching
> between Solaris and Windows.
> The code is in clearcase, which uses some sort of network file
> system.
> In our case, that means that I'll be accessing the same directories
> from both
> platforms, so .pyc-files from one platform will be visible when I run
> the
> code on the other platform.
>
> The .pyc-file will contain a string pointing to the file is was built
> from.
> The path to that file will be different under different platforms, so
> when the
> string is used, there will be error printouts.
> At least I think that's the problem, the error printouts contains
> paths that
> are only valid on the other platform.
> I don't have access to those computers atm, so I can't show the exact
> message.
>
> The only solution I've seen is to make sure to clean up the .pyc files
> each
> time I switch platform.
>
>   
Is Clearcase still around?  I hope it works better than it did in 1992.

Somebody else has already pointed out that you can tell Python not to 
create those files (during your development stages).

But if that won't work for some reason, perhaps you can do something 
with symbolic links.  I remember that RCS, for example, required that 
the archives be located in a directory immediately below the one with 
the sources.  So in order to share those archives, you made the 
subdirectory actually a link to a common network location.

Your case would seem to be the opposite.  But I don't know enough about 
the current state of either Solaris or Clearcase to know the best answer.

Perhaps Clearcase supports some form of "exclusion" parameter, wherein 
you say not to do version control on files with certain patterns, like .pyc



From piet at cs.uu.nl  Sun May 24 18:16:19 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Mon, 25 May 2009 00:16:19 +0200
Subject: Need Help
References: <5f238e07-8d39-4bb4-8c6a-cbd56412fb5a@c36g2000yqn.googlegroups.com>
Message-ID: <m2y6sm6tak.fsf@cs.uu.nl>

>>>>> abosalim <mohammed.abosalim at gmail.com> (a) a ?crit:

>a> #Gui
>a> import re, collections
>a> from Tkinter import *
>a> from nltk_lite import tokenize

>a> def words(text): return re.findall('[a-z]+', text.lower())
>a> def train(features):
>a>     model = collections.defaultdict(lambda: 1)
>a>     for f in features:
>a>         model[f] += 1
>a>         return model

The return statement should be shifted left 4 spaces. Now it is inside
the loop instead of after the loop.

By the way, it is better to add python code as attachment instead of
inline text because some news software might fold the lines like in your
posting, making it difficult to reconstruct the code.

...
>a>     def new(self):
>a>         self.string = self.contents.get()
>a> #pass contents of textfield to words()method above
>a>         self.res=  words(self.string)
>a>         self.frame2 = Frame()
>a>         self.frame2.pack()
>a>         self.words = Label(self.frame2, text=self.res, fg="blue", font=
>a> ("Arial", 16))
>a>         self.words.pack()

>a> It print text without correction.I think it didn't enter the method or
>a> any method above the gui.
>a> Please if you have any information,inform me

You don't call correct() or textcorrect() anywhere in your GUI code.
I think instead of self.res=  words(self.string) you should call one of
these. 

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From joanacfcampos at gmail.com  Sun May 24 18:34:42 2009
From: joanacfcampos at gmail.com (Joana)
Date: Sun, 24 May 2009 15:34:42 -0700 (PDT)
Subject: Compile python extensions under windows/cygwin
Message-ID: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>

I mantain Python on Windows, all installed packages are under c:
\Python25\Lib\site-packages. Now I have to build C libraries used by
python extensions and I am using cygwin, but I don't know how to
install the module in Windows directory.

Can anyone help me?

Thanks in advance

Joana


From JKPeck at gmail.com  Sun May 24 18:51:55 2009
From: JKPeck at gmail.com (JKPeck)
Date: Sun, 24 May 2009 15:51:55 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org> 
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com> 
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com> 
	<mailman.681.1243202929.8015.python-list@python.org>
Message-ID: <a98133e8-c5eb-41d1-a0c0-2bc1c6710db2@p6g2000pre.googlegroups.com>

On May 24, 4:08?pm, Dave Angel <da... at ieee.org> wrote:
> pythoncuri... at gmail.com wrote:
> > On May 24, 3:58 pm, John Machin <sjmac... at lexicon.net> wrote:
>
> >> What problems? Like avoiding having to recompile your .py files makes
> >> your app run too fast?
>
> > There are real problems with this. I'm having similar problems when
> > switching
> > between Solaris and Windows.
> > The code is in clearcase, which uses some sort of network file
> > system.
> > In our case, that means that I'll be accessing the same directories
> > from both
> > platforms, so .pyc-files from one platform will be visible when I run
> > the
> > code on the other platform.
>
> > The .pyc-file will contain a string pointing to the file is was built
> > from.
> > The path to that file will be different under different platforms, so
> > when the
> > string is used, there will be error printouts.
> > At least I think that's the problem, the error printouts contains
> > paths that
> > are only valid on the other platform.
> > I don't have access to those computers atm, so I can't show the exact
> > message.
>
> > The only solution I've seen is to make sure to clean up the .pyc files
> > each
> > time I switch platform.
>
> Is Clearcase still around? ?I hope it works better than it did in 1992.
>
> Somebody else has already pointed out that you can tell Python not to
> create those files (during your development stages).
>
> But if that won't work for some reason, perhaps you can do something
> with symbolic links. ?I remember that RCS, for example, required that
> the archives be located in a directory immediately below the one with
> the sources. ?So in order to share those archives, you made the
> subdirectory actually a link to a common network location.
>
> Your case would seem to be the opposite. ?But I don't know enough about
> the current state of either Solaris or Clearcase to know the best answer.
>
> Perhaps Clearcase supports some form of "exclusion" parameter, wherein
> you say not to do version control on files with certain patterns, like .pyc

ClearCase gives you tremendous control over what can be seen at any
point.  Assuming that you are using dynamic views, the simplest way to
fix this is to use a different view for each platform.  They would
both be able to see the py files (although you could control that with
the configspec)as checked in, but the pyc files would not be checked
in and would automatically be view private.  So with two different
views, each platform would only see its own pyc files.

HTH,
Jon Peck


From db3l.net at gmail.com  Sun May 24 18:58:03 2009
From: db3l.net at gmail.com (David Bolen)
Date: Sun, 24 May 2009 18:58:03 -0400
Subject: A fast way to read last line of gzip archive ?
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
Message-ID: <m2y6smm7lw.fsf@valheru.db3l.homeip.net>

"Barak, Ron" <Ron.Barak at lsi.com> writes:

> I thought maybe someone has a way to unzip just the end portion of
> the archive (instead of the whole archive), as only the last part is
> needed for reading the last line.

The problem is that gzip compressed output has no reliable
intermediate break points that you can jump to and just start
decompressing without having worked through the prior data.

In your specific code, using readlines() is probably not ideal as it
will create the full list containing all of the decoded file contents
in memory only to let you pick the last one.  So a small optimization
would be to just iterate through the file (directly or by calling
readline()) until you reach the last line.

However, since you don't care about the bulk of the file, but only
need to work with the final line in Python, this is an activity that
could be handled more efficiently handled with external tools, as you
need not involve much intepreter time to actually decompress/discard
the bulk of the file.

For example, on my system, comparing these two cases:

    # last.py

    import gzip
    import sys

    in_file = gzip.open(sys.argv[1],'r')
    for line in in_file:
        pass
    print 'Last:', line


    # last-popen.py

    import sys
    from subprocess import Popen, PIPE

    # Implement gzip -dc <file> | tail -1
    gzip = Popen(['gzip', '-dc', sys.argv[1]], stdout=PIPE)
    tail = Popen(['tail', '-1'], stdin=gzip.stdout, stdout=PIPE)
    line = tail.communicate()[0]
    print 'Last:', line

with an ~80MB log file compressed to about 8MB resulted in last.py
taking about 26 seconds, while last-popen took about 1.7s.  Both
resulted in the same value in "line".  As long as you have local
binaries for gzip/tail (such as Cygwin or MingW or equivalent) this
works fine on Windows systems too.

If you really want to keep everything in Python, then I'd suggest
working to optimize the "skip" portion of the task, trying to
decompress the bulk of the file as quickly as possible.  For example,
one possibility would be something like:

    # last-chunk.py
    
    import gzip
    import sys
    from cStringIO import StringIO

    in_file = gzip.open(sys.argv[1],'r')

    chunks = ['', '']
    while 1:
        chunk = in_file.read(1024*1024)
        if not chunk:
            break
        del chunks[0]
        chunks.append(chunk)

    data = StringIO(''.join(chunks))
    for line in data:
        pass
    print 'Last:', line

with the idea that you decode about a MB at a time, holding onto the
final two chunks (in case the actual final chunk turns out to be
smaller than one of your lines), and then only process those for
lines.  There's probably some room for tweaking the mechanism for
holding onto just the last two chunks, but I'm not sure it will make
a major difference in performance.

In the same environment of mine as the earlier tests, the above took
about 2.7s.  So still much slower than the external utilities in
percentage terms, but in absolute terms, a second or so may not be
critical for you compared to pure Python.

-- David


From lists at cheimes.de  Sun May 24 19:13:53 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 25 May 2009 01:13:53 +0200
Subject: Compile python extensions under windows/cygwin
In-Reply-To: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
References: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
Message-ID: <gvckbh$tku$1@ger.gmane.org>

Joana wrote:
> I mantain Python on Windows, all installed packages are under c:
> \Python25\Lib\site-packages. Now I have to build C libraries used by
> python extensions and I am using cygwin, but I don't know how to
> install the module in Windows directory.

Are you sure you want to use Cygwin? Binaries build with and for Cygwin
are not compatible with ordinary Windows binaries. I assume that you
want to build C extensions with the open source MinGW32 compiler? That's
easy:

* Install MinGW32
* Add its bin directory to PATH
* Add a file distutils.cfg in C:\Python25\Lib\distutils with
  this content:

[build]
compiler=mingw32


* Have fun :)

Christian



From vladimir at acm.org  Sun May 24 19:19:57 2009
From: vladimir at acm.org (Vladimir G. Ivanovic)
Date: Sun, 24 May 2009 16:19:57 -0700
Subject: Searching for pyvm
Message-ID: <4A19D61D.6020409@acm.org>

Hello,

I'm looking for the sources to pyvm, a python virtual machine
implementation which can run Python 2.4 bytecode.

If someone could point me in the right direction, I would appreciate it.

Thanks.

--- Vladimir

P.S. The link on the author's pyvm page is broken, and I have been
unable to find a copy elsewhere (Google, FTP servers, All-the-Web
search, etc.)

-- 
Vladimir G. Ivanovic



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From david.lyon at preisshare.net  Sun May 24 19:21:21 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Sun, 24 May 2009 19:21:21 -0400
Subject: how to get rid of pyc files =?UTF-8?Q?=3F?=
In-Reply-To: <4A19453F.5050204@gmail.com>
References: <4A19453F.5050204@gmail.com>
Message-ID: <1896a3d353dddf82ee02bbb17e5fcf52@preisshare.net>

On Sun, 24 May 2009 15:01:51 +0200, Stef Mientki <stef.mientki at gmail.com>
wrote:
> hello,
> 
> Moving my entire program section between windows and Ubuntu,
> sometimes causes problems, due to the existence of pyc-files
> (and probably because my program still has hard coded paths).
> 
> Is there a way to prevent generating pyc-files ?
> Or is there a way to redirect the generated pyc-files to a dedicated 
> location ?

Yes.. I see your problem...

try something else.... linking the files in linux...

Try this:

 - create a windows "run-directory" as in 'mkdir win-run'

 - create symbolic link in the win-run directory for each script
    
    - 'cd win-run'

    - 'ln -s /home/user/mypythondir/hello.py hello.py'

    - for every source file...


Now you'll be able to run both...

Under windows the .pyc files will be created in the
win-run directory and under linux in /home/user/mypythondir

David



From joanacfcampos at gmail.com  Sun May 24 19:32:57 2009
From: joanacfcampos at gmail.com (Joana)
Date: Sun, 24 May 2009 16:32:57 -0700 (PDT)
Subject: Compile python extensions under windows/cygwin
References: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
	<mailman.682.1243206845.8015.python-list@python.org>
Message-ID: <918cfe57-563d-4bd9-a93c-aa0cec233ac2@j18g2000yql.googlegroups.com>

On 25 Maio, 00:13, Christian Heimes <li... at cheimes.de> wrote:
> Joana wrote:
> > I mantain Python on Windows, all installed packages are under c:
> > \Python25\Lib\site-packages. Now I have to build C libraries used by
> > python extensions and I am using cygwin, but I don't know how to
> > install the module in Windows directory.
>
> Are you sure you want to use Cygwin? Binaries build with and for Cygwin
> are not compatible with ordinary Windows binaries. I assume that you
> want to build C extensions with the open source MinGW32 compiler? That's
> easy:
>
> * Install MinGW32
> * Add its bin directory to PATH
> * Add a file distutils.cfg in C:\Python25\Lib\distutils with
> ? this content:
>
> [build]
> compiler=mingw32
>
> * Have fun :)
>
> Christian

hmm.. but the problem with mingw32 is that it does not have the
libraries I need. The module I want to install includes netinet/in.h.
So the answer is that I can't install that module in Windows?


From david.lyon at preisshare.net  Sun May 24 19:42:01 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Sun, 24 May 2009 19:42:01 -0400
Subject: Compile python extensions under windows/cygwin
In-Reply-To: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
References: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
Message-ID: <a1512dd6d680d556cfbbda6b1a021b7c@preisshare.net>

On Sun, 24 May 2009 15:34:42 -0700 (PDT), Joana <joanacfcampos at gmail.com>
wrote:
> I mantain Python on Windows, all installed packages are under c:
> \Python25\Lib\site-packages. Now I have to build C libraries used by
> python extensions and I am using cygwin, but I don't know how to
> install the module in Windows directory.
> 
> Can anyone help me?

I think it is a problem because as far as I know cygwin cannot
see files outside of /cygwin. 

Where is python installed in cygwin?

Can't you install the same packages into cygwin?

and then do your building in there...?

David


From davea at ieee.org  Sun May 24 19:46:28 2009
From: davea at ieee.org (Dave Angel)
Date: Sun, 24 May 2009 19:46:28 -0400
Subject: writing on file not until the end
In-Reply-To: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
Message-ID: <4A19DC54.6010601@ieee.org>

Alexzive wrote:
> Hello,
> I am a newby with python. I wrote the following code to extract a text
> from a file and write it to another file:
>
> linestring = open(path, 'r').read() #read all the inp file in
> linestring
>
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)
>
> unfortunately when I check N.txt some lines are missing (it only crop
> until "57, 0.231749688431, 0.0405121944142" but I espect the final
> line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> all the lines until "242..")
>
> when I try Nfile.write(textN) again it writes some more lines but
> still not all!
> what is wrong whit this?
>
> Many thanks for your help!
> Alex
>
> the original file to crop (in path) looks like this:
>
> <snip>
>
>
>   
Is there a reason you used e-1 instead of e in the slice?  That's going 
to chop off the last newline.  And in some (broken) text viewers, you 
might not see the partial line.  Also, it'll behave a bit different in 
Windows than in one of the Unix variants, due to newline being 
represented by two characters instead of one.

e=linestring.index("*",i+10)
textN = linestring[i+2:e-1] # crop the ELement+nodes list




From matt at tplus1.com  Sun May 24 19:46:31 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Sun, 24 May 2009 23:46:31 GMT
Subject: I need help building a data structure for a state diagram
References: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>
	<89cbdfa9-2107-47c3-900c-ac0b574614a3@r37g2000yqd.googlegroups.com>
Message-ID: <r%kSl.30872$YU2.3253@nlpi066.nbdc.sbc.com>

On Sun 24 May 2009 03:42:01 PM EDT, Kay Schluehr wrote:
>
> General answer: you can encode finite state machines as grammars.
> States as non-terminals and transition labels as terminals:
>
> UNSTARTED: 'start' STARTED
> STARTED: 'ok' FINISHED | 'cancel' ABANDONED
> ABANDONED: 'done'
> FINISHED: 'done'
>
> In some sense each state-machine is also a little language.


I've never formally studied grammars, but I've worked through trivial
stuff that uses BNF to express ideas like 

    <postal-address> ::= <name-part> <street-address> <zip-part>

I don't really understand how to apply that notion to this statement:

    UNSTARTED: 'start' STARTED

That doesn't seem to be BNF, and that's all I know about grammar stuff.

Can you explain a little more?  This idea of using grammars for my
workflow sounds *really* fun and I'd love to learn this stuff, but I
could benefit from some more explanation.


Matt


From matt at tplus1.com  Sun May 24 19:51:09 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Sun, 24 May 2009 23:51:09 GMT
Subject: How can I get access to the function called as a property?
Message-ID: <N3lSl.30873$YU2.7989@nlpi066.nbdc.sbc.com>

I use a @property decorator to turn some methods on a class into
properties.  I want to be able to access some of the attributes of the
original funtion, but I don't know how to get to it.

Any ideas?

Matt


From davea at ieee.org  Sun May 24 19:51:42 2009
From: davea at ieee.org (Dave Angel)
Date: Sun, 24 May 2009 19:51:42 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <gvc6np$plr$1@ger.gmane.org>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.535.1242945935.8015.python-list@python.org>	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>	<gvb8kn$7gm$2@lust.ihug.co.nz>
	<gvc6np$plr$1@ger.gmane.org>
Message-ID: <4A19DD8E.6020207@ieee.org>



Dennis Lee Bieber wrote:
> On Sun, 24 May 2009 22:47:51 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
>
>
>   
>> As for exactitude in physics, Gregory Chaitin among others has been trying 
>> to rework physics to get rid of real numbers altogether.
>>     
>
> 	By decreeing that the value of PI is 3?
>   
Only in Ohio.



From max at alcyone.com  Sun May 24 19:59:57 2009
From: max at alcyone.com (Erik Max Francis)
Date: Sun, 24 May 2009 16:59:57 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <gvas9k$vvf$1@lust.ihug.co.nz>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<gvas9k$vvf$1@lust.ihug.co.nz>
Message-ID: <9MWdnTfMPPrjQoTXnZ2dnUVZ_vadnZ2d@giganews.com>

Lawrence D'Oliveiro wrote:
> In message <mailman.525.1242941777.8015.python-list at python.org>, Christian 
> Heimes wrote:
> 
>> Welcome to IEEE 754 floating point land! :)
> 
> It used to be worse in the days before IEEE 754 became widespread. Anybody 
> remember a certain Prof William Kahan from Berkeley, and the foreword he 
> wrote to the Apple Numerics Manual, 2nd Edition, published in 1988? It's 
> such a classic piece that I think it should be posted somewhere...

I only see used versions of it available for purchase.  Care to hum a 
few bars?

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM, Y!M, Skype erikmaxfrancis
   I get my kicks above the wasteline, sunshine
    -- The American, _Chess_


From lists at cheimes.de  Sun May 24 20:54:57 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 25 May 2009 02:54:57 +0200
Subject: Compile python extensions under windows/cygwin
In-Reply-To: <918cfe57-563d-4bd9-a93c-aa0cec233ac2@j18g2000yql.googlegroups.com>
References: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>	<mailman.682.1243206845.8015.python-list@python.org>
	<918cfe57-563d-4bd9-a93c-aa0cec233ac2@j18g2000yql.googlegroups.com>
Message-ID: <gvcq91$8fv$1@ger.gmane.org>

Joana wrote
> hmm.. but the problem with mingw32 is that it does not have the
> libraries I need. The module I want to install includes netinet/in.h.
> So the answer is that I can't install that module in Windows?

What's the name of the package? Perhaps it doesn't work on Windows. Or
it hasn't been ported to Windows yet. On Windows most definition are in
the files winsock.h and winsock2.h rather than in netinet/*.h.

Christian



From tjreedy at udel.edu  Sun May 24 21:14:30 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 24 May 2009 21:14:30 -0400
Subject: how to get rid of pyc files ?
In-Reply-To: <4A19453F.5050204@gmail.com>
References: <4A19453F.5050204@gmail.com>
Message-ID: <gvcrdk$9dk$1@ger.gmane.org>

Stef Mientki wrote:

> btw, What commandline switches are available for python ?

The set of documents on the site and at least on Windows comes with
Using Python.  First chapter: Command Line ....



From ldo at geek-central.gen.new_zealand  Sun May 24 21:39:02 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 25 May 2009 13:39:02 +1200
Subject: About Standard Numerics (was Re: 4 hundred quadrillonth?)
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<gvas9k$vvf$1@lust.ihug.co.nz>
	<9MWdnTfMPPrjQoTXnZ2dnUVZ_vadnZ2d@giganews.com>
Message-ID: <gvcsrm$677$1@lust.ihug.co.nz>

In message <9MWdnTfMPPrjQoTXnZ2dnUVZ_vadnZ2d at giganews.com>, Erik Max Francis 
wrote:

> Lawrence D'Oliveiro wrote:
>
>> In message <mailman.525.1242941777.8015.python-list at python.org>,
>> Christian Heimes wrote:
>> 
>>> Welcome to IEEE 754 floating point land! :)
>> 
>> It used to be worse in the days before IEEE 754 became widespread.
>> Anybody remember a certain Prof William Kahan from Berkeley, and the
>> foreword he wrote to the Apple Numerics Manual, 2nd Edition, published in
>> 1988? It's such a classic piece that I think it should be posted
>> somewhere...
> 
> I only see used versions of it available for purchase.  Care to hum a
> few bars?

Part I of this book is mainly for people who perform scientific, 
statistical, or engineering computations on Apple? computers. The rest is 
mainly for producers of software, especially of language processors, that 
people will use on Apple computers to perform computations in those fields 
and in finance and business too. Moreover, if the first edition was any 
indication, people who have nothing to do with Apple computers may well buy 
this book just to learn a little about an arcane subject, floating-point 
arithmetic on computers, and will wish they had an Apple.

Computer arithmetic has two properties that add to its mystery:

* What you see is often not what you get, and
* What you get is sometimes not what you wanted.

Floating-point arithmetic, the kind computers use for protracted work with 
approximate data, is intrinsically approximate because the alternative, 
exact arithmetic, could take longer than most people are willing to wait--
perhaps forever. Approximate results are customarily displayed or printed to 
show only as many of their leading digits as matter instead of all digits; 
what you see need not be exactly what you've got. To complicate matters, 
whatever digits you see are /decimal/ digits, the kind you saw first in 
school and the kind used in hand-held calculators. Nowadays almost no 
computers perform their arithmetic with decimal digits; most of them use 
/binary/, which is mathematically better than decimal where they differ, but 
different nonetheless. So, unless you have a small integer, what you see is 
rarely just what you have.

In the mid 1960's, computer architects discovered shortcuts that made 
arithmetic run faster at the cost of what they reckoned to be a slight 
increase in the level of rounding error; they thought you could not object 
to slight alterations in the rightmost digits of numbers since you could not 
see those digits anyway. They had the best intentions, but they accomplished 
the opposite of what they intended. Computer throughputs were not improved 
perceptibly by those shortcuts, but a few programs that had previously been 
trusted unreservedly turned treacherous, failing in mysterious ways on 
extremely rare occasions.

For instance, a very Important Bunch of Machines launched in 1964 were found 
to have two anomalies in their double-precision arithmetic (though not in 
single): First, multiplying a number /Z/ by 1.0 would lop off /Z/'s last 
digit. Second, the difference between two nearly equal numbers, whose digits 
mostly canceled, could be computed wrong by a factor almost as big as 16 
instead of being computed exactly as is normal. The anomalies introduced a 
kind of noise in the feedback loops by which some programs had compensated 
for their own rounding errors, so those programs lost their high accuracies. 
These anomalies were not "bugs"; they were "features" designed into the 
arithmetic by designers who thought nobody would care. Customers did care; 
the arithmetic was redesigned and repairs were retrofitted in 1967.

Not all Capriciously Designed Computer arithmetics have been repaired. One 
family of computers has enjoyed notoriety for two decades by allowing 
programs to generate tiny "partially underflowed" numbers. When one of these 
creatures turns up as the value of /T/ in an otherwise innocuous statement 
like

if T = 0.0 then Q := 0.0 else Q := 702345.6 / (T + 0.00189 / T);

it causes the computer to stop execution and emit a message alleging 
"Division by Zero". The machine's schizophrenic attitude toward zero comes 
about because the test for T = 0.0 is carried out by the adder, which 
examines at least 13 of /T/'s leading digits, whereas the divider and 
multiplier examine only 12 to recognize zero. Doing so saved less than a 
dollar's worth of transistors and maybe a picosecond of time, but at the 
cost of some disagreement about whether a very tiny number /T/ is zero or 
not. Fortunately, the divider agrees with the multiplier about whether /T/ 
is zero, so programmers could prevent spurious divisions by zero by slightly 
altering the foregoing statement as follows:

if 1.0 * T = 0.0 then Q := 0.0 else Q := 702345.6 / (T + 0.00189 / T);

Unfortunately, the Same Computer designer responsible for "partial 
underflow" designed another machine that can generate "partially 
underflowed" numbers /T/ for which this statement malfunctions. On that 
machine, /Q/ would be computed unexceptionably except that the product 1.0 * 
T causes the machine to stop and emit a message alleging "Overflow". How 
should a programmer rewrite that innocuous statement so that it will work 
correctly on both machines? We should be thankful that such a task is not 
encountered every day.

Anomalies related to roundoff are extremely difficult to diagnose. For 
instance, the machine on which 1.0 * T can overflow also divides in a 
peculiar way that causes quotients like 240.0 / 80.0, which ought to produce 
small integers, sometimes to produce nonintegers instead, sometimes slightly 
too big, sometimes slightly too small. The same machine multiplies in a 
peculiar way, and it subtracts in a peculiar way that can get the difference 
wrong by almost a factor of 2 when it ought to be exact because of 
cancellation.

Another peculiar kind of subtraction, but different, afflicts the machines 
that are schizophrenic about zero. Sets of three values /X/, /Y/ and /Z/ 
abound for which the statement

if (X = Y) and ((X - Z) > (Y - Z)) then writeln('Strange!');

will print "Strange!" on those machines. And many machines will print 
"Strange!" for unlucky values /X/ and /Y/ in the statement

if (X - Y = 0.0) and (X > Y) then writeln('Strange!');

because of underflow.

/These strange things cannot happen on current Apple computers./

I do not wish to suggest that all but Apple computers have had quirky 
arithmetics. A few other computer companies, some Highly Prestigious, have 
Demonstrated Exemplary Concern for arithmetic integrity over many years. Had 
their concern been shared more widely, numerical computation would now be 
easier to understand. Instead, because so many computers in the 1960's and 
1970's possessed so many different arithmetic anomalies, computational lore 
has become encumbered with a vast body of superstition purporting to cope 
with them. One such superstitious rule is "/Never/ ask whether floating-
point numbers are exactly equal".

Presumably the reasonable thing to do instead is to ask whether the numbers 
differ by less than some tolerance; and this /is/ truly reasonable provided 
you know what tolerance to choose. But the word /never/ is what turns the 
rule from reasonable into mere superstition. Even if every floating-point 
comparison in your program involved a tolerance, you would wish to predict 
which path execution would follow from various input data, and whether the 
different comparisons were mutually consistent. For instance, the predicates 
X < Y - TOL and Y - TOL > X seem equivalent to the naked eye, but computers 
exist (/not/ made by Apple!) on which one can be true and the other false 
for certain values of the variables. To ask "Which?" violates the 
superstitious rule.

There have been several attempts to avoid superstition by devising 
mathematical rules called /axioms/ that would be valid for all commercially 
significant computers and from which a programmer might hope to be able to 
deduce whether his program will function correctly on all those computers. 
Unfortunately, such attempts cannot succeed without failing! The paradox 
arises because any such rules, to be valid universally, have to encompass so 
wide a range of anomalies as to constitute the specifications for a 
hypothetical computer far worse arithmetically than any ever actually built. 
In consequence, many computations provably impossible on that hypothetical 
computer would be quite feasible on almost every actual computer. For 
instance, the axioms must imply limits to the accuracy with which 
differential equations can be solved, integrals evaluated, infinite series 
summed, and areas of triangles calculated; but these limits are routinely 
surpassed nowadays by programs that run on most commercially significant 
computers, although some computers may require programs that are so special 
that they would be useless on any other machine.

Arithmetic anarchy is where we seemed headed until a decade ago when work 
began upon IEEE Standard 754 for binary floating-point arithmetic. Apple's 
mathematicians and engineers helped from the very beginning. The resulting 
family of coherent designs for computer arithmetic has been adopted more 
widely, and by more computer manufacturers, than any other single design. 
Besides the undoubted benefits that flow from any standard, the principal  
benefit derived from the IEEE standard in particular is this:

/Program importability:/ Almost any application of floating-point 
arithmetic, designed to work on a few different families of computers in 
existence before the IEEE Standard and programmed in a higher-level 
language, will, after recompilation, work at least about as well on an Apple 
computer or on any other machine that conforms to IEEE Standard 754 as on 
any nonconforming computer with comparable capacity (memory, speed, and word 
size).

The Standard Apple Numerics Environment (SANE) is the most thorough 
implementation of IEEE Standard 754 to date. The fanatical attention to 
detail that permeates SANE's implementation largely relieves Apple computer 
users from having to know any more about those details than they like. If 
you come to an Apple computer from some other computer that you were fond 
of, you will find the Apple computer's arithmetic at least about as good, 
and quite likely rather better. An Apple computer can be set up to mimic the 
worthwhile characteristics of almost any reasonable past computer 
arithmetic, so existing libraries of numerical software do not have to be 
discarded if they can be recompiled. SANE also offers features that are 
unique to the IEEE Standard, new capabilities that previous generations of 
computer users could only yearn for; but to learn what they are, you will 
have to read this book.

As one of the designers of IEEE Standard 754, I can only stand in awe of the 
efforts that Apple has expended to implement that standard faithfully both 
in hardware and in software, including language processors, so that users of 
Apple computers will actually reap tangible benefits from the Standard. And 
I thank Apple for letting me explain in this foreword why we needed that 
standard.

                                Professor W. Kahan
                                Mathematics Department and
                                Electrical Engineering and
                                Computer Science Department
                                University of California at Berkeley
                                December 16, 1987




From benjamin at python.org  Sun May 24 22:07:58 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Mon, 25 May 2009 02:07:58 +0000 (UTC)
Subject: How can I get access to the function called as a property?
References: <N3lSl.30873$YU2.7989@nlpi066.nbdc.sbc.com>
Message-ID: <loom.20090525T020650-873@post.gmane.org>

Matthew Wilson <matt <at> tplus1.com> writes:

> 
> I use a @property decorator to turn some methods on a class into
> properties.  I want to be able to access some of the attributes of the
> original funtion, but I don't know how to get to it.

my_class.__dict__["some_property].(fget|fdel|fset)





From lists at cheimes.de  Sun May 24 22:08:41 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 25 May 2009 04:08:41 +0200
Subject: How can I get access to the function called as a property?
In-Reply-To: <N3lSl.30873$YU2.7989@nlpi066.nbdc.sbc.com>
References: <N3lSl.30873$YU2.7989@nlpi066.nbdc.sbc.com>
Message-ID: <gvcuj9$f7q$1@ger.gmane.org>

Matthew Wilson schrieb:
> I use a @property decorator to turn some methods on a class into
> properties.  I want to be able to access some of the attributes of the
> original funtion, but I don't know how to get to it.
> 
> Any ideas?

Here you are:

>>> class Example(object):
...     @property
...     def func(self):
...         pass
...
>>> Example.func.fget
<function func at 0x7fc8d3129938>
>>> example = Example()
>>> example.__class__.func
<property object at 0x7fc8d31309f0>
>>> example.__class__.func.fget
<function func at 0x7fc8d3129938>



From dyamins at gmail.com  Sun May 24 22:32:46 2009
From: dyamins at gmail.com (Dan Yamins)
Date: Sun, 24 May 2009 22:32:46 -0400
Subject: Python -> R?
In-Reply-To: <gv90n1$1h4$1@ger.gmane.org>
References: <gv90n1$1h4$1@ger.gmane.org>
Message-ID: <15e4667e0905241932p2a47b08aj9dc79aaeadf32078@mail.gmail.com>

>
> If so, what are you using? I have read about RPy, is that a good
> solution?



Yes, I think it's quite a good solution.  It's not exactly 100% as
convenient as working directly in R, but that's IMO more than compensated by
the ability to use Python's syntax.

Make sure you use Rpy2 (the successor to Rpy) -- I find it significantly
better.   However, the online documentation is in IMHO a little thin -- at
least, in terms of examples -- so I once wrote up a little 5-minute tutorial
to show a friend how to use Rpy2.  I've attached it to this message -- you
may find it useful.

best
Dan
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From steven at REMOVE.THIS.cybersource.com.au  Sun May 24 22:39:37 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 25 May 2009 02:39:37 GMT
Subject: Need Help
References: <5f238e07-8d39-4bb4-8c6a-cbd56412fb5a@c36g2000yqn.googlegroups.com>
	<m2y6sm6tak.fsf@cs.uu.nl>
Message-ID: <pan.2009.05.25.02.39.37@REMOVE.THIS.cybersource.com.au>

On Mon, 25 May 2009 00:16:19 +0200, Piet van Oostrum wrote:

> By the way, it is better to add python code as attachment instead of
> inline text because some news software might fold the lines like in your
> posting, making it difficult to reconstruct the code.

Except that some news software might not show the attachment at all.

-- 
Steven


From timr at probo.com  Sun May 24 22:44:07 2009
From: timr at probo.com (Tim Roberts)
Date: Sun, 24 May 2009 19:44:07 -0700
Subject: making a python program in windows
References: <mailman.488.1242897741.8015.python-list@python.org>
	<l-OdnQ3QTPFTt4jXnZ2dnUVZ8tJi4p2d@bt.com>
	<c361a5d5-e63a-4117-8c55-21ae31245ff2@b6g2000pre.googlegroups.com>
	<Xns9C1284B6480C9duncanbooth@127.0.0.1>
	<7530b645-d6dc-483a-94ed-0dfbe9331ee2@d7g2000prl.googlegroups.com>
Message-ID: <qe1k151n82v796875lt1g6c3cd14fq9026@4ax.com>

rustom <rustompmody at gmail.com> wrote:
>
>Thanks for this (and all other) tips.
>Strangely now my m/c shows things exactly like so. A new .py file gets
>associated with python but two days ago it was with pythonw?!

No, .py files are always associated with python.exe.  .pyw files are
associated with pythonw.exe.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From steven at REMOVE.THIS.cybersource.com.au  Sun May 24 22:45:10 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 25 May 2009 02:45:10 GMT
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org>
Message-ID: <pan.2009.05.25.02.45.10@REMOVE.THIS.cybersource.com.au>

On Sun, 24 May 2009 15:01:51 +0200, Stef Mientki wrote:

> Is there a way to prevent generating pyc-files ? 

Put the .py files in a read-only directory.


> Or is there a way to
> redirect the generated pyc-files to a dedicated location ?

No.


> btw, What commandline switches are available for python ? (googling
> didn't give me any relevant hits )

python --help


at the shell (not Python) prompt.



-- 
Steven


From ldo at geek-central.gen.new_zealand  Sun May 24 22:59:24 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 25 May 2009 14:59:24 +1200
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
Message-ID: <gvd1id$8jj$2@lust.ihug.co.nz>

In message <roy-3C4DED.09214724052009 at news.panix.com>, Roy Smith wrote:

> In article <gvb8fn$7gm$1 at lust.ihug.co.nz>,
>  Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
> 
>> The right thing to do is try to ensure that all your connections are
>> properly closed at shutdown. That may not be enough (if your server
>> crashes due to bugs), so the other thing you need to do is retry the
>> socket open, say, at 30-second intervals, until it succeeds.
> 
> That may be a reasonable thing to do for production code, but when you're
> building and debugging a server, it's a real pain to not be able to
> restart it quickly whenever you want (or need) to.

On the contrary, I run exactly the same logic--and that includes socket-
handling logic--in both test and production servers. How else can I be sure 
it'll work properly in production?



From drobinow at gmail.com  Sun May 24 23:19:35 2009
From: drobinow at gmail.com (David Robinow)
Date: Sun, 24 May 2009 23:19:35 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <4A19DD8E.6020207@ieee.org>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
	<gvb8kn$7gm$2@lust.ihug.co.nz> <gvc6np$plr$1@ger.gmane.org>
	<4A19DD8E.6020207@ieee.org>
Message-ID: <4eb0089f0905242019l39dad925wc214698bb067e58e@mail.gmail.com>

On Sun, May 24, 2009 at 7:51 PM, Dave Angel <davea at ieee.org> wrote:
>> ? ? ? ?By decreeing that the value of PI is 3?
>>
>
> Only in Ohio.
Please, we're smarter than that in Ohio. In fact, while the Indiana
legislature was learning about PI, we had guys inventing the airplane.

http://en.wikipedia.org/wiki/Indiana_Pi_Bill


From jhg at acm.org  Sun May 24 23:29:50 2009
From: jhg at acm.org (Jim Garrison)
Date: Sun, 24 May 2009 22:29:50 -0500
Subject: Can I get a technical explanation on the following error
In-Reply-To: <mailman.679.1243200974.8015.python-list@python.org>
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>	<4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>	<1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
	<mailman.679.1243200974.8015.python-list@python.org>
Message-ID: <4a1a1084$0$19026$4c5ecfc7@fe1.usenet.com>

And as an interesting exercise, try

print r'test \'
print r'test \\'

Because of the way raw string parsing is defined, neither of these will
pass the parser.  In fact, a raw string cannot have a backslash as
its last character.


From ldo at geek-central.gen.new_zealand  Mon May 25 00:21:19 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 25 May 2009 16:21:19 +1200
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
	<gvb8kn$7gm$2@lust.ihug.co.nz>
	<mailman.674.1243192904.8015.python-list@python.org>
Message-ID: <gvd6c0$bqs$1@lust.ihug.co.nz>

In message <mailman.674.1243192904.8015.python-list at python.org>, Dennis Lee 
Bieber wrote:

> On Sun, 24 May 2009 22:47:51 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
> 
>> As for exactitude in physics, Gregory Chaitin among others has been
>> trying to rework physics to get rid of real numbers altogether.
> 
> By decreeing that the value of PI is 3?

Interesting kind of mindset, that assumes that the opposite of "real" must 
be "integer" or a subset thereof...



From brendan.johnston at gmail.com  Mon May 25 00:28:15 2009
From: brendan.johnston at gmail.com (brendan.johnston at gmail.com)
Date: Sun, 24 May 2009 21:28:15 -0700 (PDT)
Subject: Compile python extensions under windows/cygwin
References: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
	<mailman.685.1243208719.8015.python-list@python.org>
Message-ID: <64d2e7e9-38ef-4d0d-977f-13ef4fe23cc1@y6g2000prf.googlegroups.com>

On May 25, 9:42?am, David Lyon <david.l... at preisshare.net> wrote:
> On Sun, 24 May 2009 15:34:42 -0700 (PDT), Joana <joanacfcam... at gmail.com>
> wrote:
>
> > I mantain Python on Windows, all installed packages are under c:
> > \Python25\Lib\site-packages. Now I have to build C libraries used by
> > python extensions and I am using cygwin, but I don't know how to
> > install the module in Windows directory.
>
> > Can anyone help me?
>
> I think it is a problem because as far as I know cygwin cannot
> see files outside of /cygwin.
>
> Where is python installed in cygwin?
>
> Can't you install the same packages into cygwin?
>
> and then do your building in there...?
>
> David

I think I don't understand this comment.

All the drives on my windows machine are visible using the scheme:

/cygdrive/<drivename>/<path>/<to>/<file>

For example:

bash-3.2$ ls -l /cygdrive/c/windows/system32/drivers/etc/hosts
-rwx------+ 1 johnbre mkgroup-l-d 820 Nov  8  2008 /cygdrive/c/windows/
system32/drivers/etc/hosts
bash-3.2$

and you can mount things in cygwin as you choose:

http://www.cygwin.com/cygwin-ug-net/using.html#mount-table

The answer to the problem of compiling python packages was:

 * Download Visual C++ 2008 Express for free from Microsoft.
 * Find it was incompatible with compiling packages for my Python 2.5
(Visual Studio 2003).
 * Move to Python 2.6.
 * Problem solved, things compiled and worked




From Eric_Dexter at msn.com  Mon May 25 01:13:34 2009
From: Eric_Dexter at msn.com (edexter)
Date: Sun, 24 May 2009 22:13:34 -0700 (PDT)
Subject: PureData py/pyExt into standalone python
References: <a3e7e823-2872-4a49-9d04-82058638aff3@z7g2000vbh.googlegroups.com>
Message-ID: <8f3291a1-8aa4-4313-acec-2b207fdc96d2@y10g2000prc.googlegroups.com>

On May 23, 6:49?am, responsib... at gmail.com wrote:
> Hi guys,
>
> Short version:
>
> I've written some python classes for py/pyExt extensions for the
> "dataflow" graphical programming environment PureData. Here's an
> example PureData screenshot for clarity:
>
> ? ? ? ? see:http://i40.tinypic.com/2rrx6gy.jpg
>
> My classes talk to eachother via the PureData system, and they talk to
> the outside world via pyPortMIDI (which enables raw MIDI data
> communication).
>
> PureData encourages modularisation, so I've written several classes:
> * some that receive raw MIDI data,
> * some that parse this into human-readable tokens,
> * some that just generate human-readable tokens,
> * and some that parse human-readable tokens then send raw MIDI data
>
> I want to join these together as a stand-alone python application,
> using internal python communication instead of PureData...
>
> ...but I don't know how to do this. The only python I know comes from
> writing using the pyExt API, and the PureData API (which is written in
> C).
>
> ----
> Long(er) version:
>
> Miller Pukette's PureData:http://puredata.info/
> Thomas Grill's Flext:http://puredata.info/Members/thomas/flext
> Thomas Grill's Py/Pyext:http://puredata.info/Members/thomas/py/
> John Harrison's PyPortMIDI:http://www.media.mit.edu/~harrison/code.html
> CMU's PortMIDI:http://www.cs.cmu.edu/~music/portmusic/
>
> PureData is a graphical "dataflow" programming environment that (among
> many, many other things!) allows for very rapid development of Audio
> and MIDI processing. Objects in PureData (and MaxMSP) communicate by
> sending messages through "patch cords" that connect an "outlet" to an
> "inlet" of another object.
>
> Thomas Grill's py/pyExt allows python code to be embedded as a
> PureData object. The benefit being that this python code can be
> effortlessly ported across multiple platforms (win32/linux/osx) and
> also to the highly related (but more commercial) Cycling'74 MaxMSP
> system. (PureData object code is written in C and generally not easy
> to port between platforms, nor between PD and MaxMSP - so writing
> portable python objects is a boon!)
>
> a pyExt object sends messages from its outlets using the line:
>
> ? ? ? ? self._outlet(outlet_id,message_to_send)
>
> a pyExt object performs actions when a message arrives at an inlet. An
> integer arriving at inlet 1 could be attached to this method code:
>
> ? ? ? ? def int_1(self,*arg):
> ? ? ? ? ? ? ? ? print "received integer:",arg[0]
>
> If these pieces of code were in separate python classes - how would I
> connect two objects together such that an integer was passed between
> the two?
>
> If the first object sent 42, in puredata it would look like this:
>
> http://i44.tinypic.com/15eh74p.gif
>
> useless fact: the screenshot doubles up (i.e. "pyext sender sender")
> due to the first word being the python file (i.e. sender.py), whilst
> the second is the name of the object class (i.e class sender
> (pyext._class)
>
> ----
> Maybe a more tricky question is:
>
> PureData supports "message busses" - messages sent to named busses can
> be broadcast to multiple locations. How would I connect objects up in
> this way using python?
>
> a pyExt object registers to receive messages on a certain bus using:
>
> ? ? ? ? self._bind(bus_name,self.method_to_call)
>
> ? ? ? ? def method_to_call(self,*arg):
> ? ? ? ? ? ? ? ? print "a message on", bus_name, "arrived"
> ? ? ? ? ? ? ? ? print "the message was", len(arg), "long"
> ? ? ? ? ? ? ? ? print "and had the values", arg, "inside"
>
> a pyExt object sends messages to a particular bus by using:
>
> ? ? ? ? self._send(bus_name,message_to_send)

* some that parse this into human-readable tokens,
* some that just generate human-readable tokens,


This might be usefull do you intend to release this code??
There are some midi libraries that may be helpful, it is hard to tell
what you need without seeing the code


From steven at REMOVE.THIS.cybersource.com.au  Mon May 25 01:22:15 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 25 May 2009 05:22:15 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
	<gvb8kn$7gm$2@lust.ihug.co.nz>
	<mailman.674.1243192904.8015.python-list@python.org>
	<gvd6c0$bqs$1@lust.ihug.co.nz>
Message-ID: <pan.2009.05.25.05.22.14@REMOVE.THIS.cybersource.com.au>

On Mon, 25 May 2009 16:21:19 +1200, Lawrence D'Oliveiro wrote:

> In message <mailman.674.1243192904.8015.python-list at python.org>, Dennis
> Lee Bieber wrote:
> 
>> On Sun, 24 May 2009 22:47:51 +1200, Lawrence D'Oliveiro
>> <ldo at geek-central.gen.new_zealand> declaimed the following in
>> gmane.comp.python.general:
>> 
>>> As for exactitude in physics, Gregory Chaitin among others has been
>>> trying to rework physics to get rid of real numbers altogether.
>> 
>> By decreeing that the value of PI is 3?
> 
> Interesting kind of mindset, that assumes that the opposite of "real"
> must be "integer" or a subset thereof...


(0) "Opposite" is not well-defined unless you have a dichotomy. In the 
case of number fields like the reals, you have more than two options, so 
"opposite of real" isn't defined.

(1/3) Why do you jump to the conclusion that "pi=3" implies that only 
integers are defined? One might have a mapping where every real number is 
transferred to the closest multiple of 1/3 (say), rather than the closest 
integer. That would still give "pi=3", without being limited to integers.

(1/2) If you "get rid of real numbers", then obviously you must have a 
smaller set of numbers, not a larger. Any superset of reals will include 
the reals, and therefore you haven't got rid of them at all, so we can 
eliminate supersets of the reals from consideration if your description 
of Chaitin's work is accurate.

(2/3) There is *no* point (2/3).

(1) I thought about numbering my points as consecutive increasing 
integers, but decided that was an awfully boring convention. A shiny 
banananana for the first person to recognise the sequence.




-- 
Steven


From kay at fiber-space.de  Mon May 25 01:30:31 2009
From: kay at fiber-space.de (Kay Schluehr)
Date: Sun, 24 May 2009 22:30:31 -0700 (PDT)
Subject: I need help building a data structure for a state diagram
References: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>
	<89cbdfa9-2107-47c3-900c-ac0b574614a3@r37g2000yqd.googlegroups.com>
	<r%kSl.30872$YU2.3253@nlpi066.nbdc.sbc.com>
Message-ID: <39a50866-90d2-4a75-9c92-a14bfd0aef02@x3g2000yqa.googlegroups.com>

On 25 Mai, 01:46, Matthew Wilson <m... at tplus1.com> wrote:
> On Sun 24 May 2009 03:42:01 PM EDT, Kay Schluehr wrote:
>
>
>
> > General answer: you can encode finite state machines as grammars.
> > States as non-terminals and transition labels as terminals:
>
> > UNSTARTED: 'start' STARTED
> > STARTED: 'ok' FINISHED | 'cancel' ABANDONED
> > ABANDONED: 'done'
> > FINISHED: 'done'
>
> > In some sense each state-machine is also a little language.
>
> I've never formally studied grammars, but I've worked through trivial
> stuff that uses BNF to express ideas like
>
> ? ? <postal-address> ::= <name-part> <street-address> <zip-part>
>
> I don't really understand how to apply that notion to this statement:
>
> ? ? UNSTARTED: 'start' STARTED
>
> That doesn't seem to be BNF, and that's all I know about grammar stuff.

Some comments

1) The separator is arbitrary. You can use ':' or '->' or '::=' etc.
2) A full EBNF grammar can be described in itself:

   GRAMMAR: RULE+
   RULE: NAME ':' RHS
   RHS: ALT ( '|' ALT )*
   ALT: ITEM+
   ITEM: '[' RHS ']' | ATOM [ '*' | '+' ]
   ATOM: '(' RHS ')' | NAME | STRING
   STRING: '"' any* '"'
   NAME: char (digit | char)*

   [A]   zero or one repetition
   A*    zero or more repetitions
   A+    one or more repetitions
   A|B   A or B
   A B   first A next B
  (A ..) parentheses for separation
   "A"   keyword A


In some sense all the words 'start', 'done', 'ok' etc. are keywords of
the language. If I actually attempted to use the grammar for parsing
it could parse a few sentences like:

'start ok done' or 'start cancel done'

and create parse trees [UNSTARTED, start, [STARTED, ok, [FINSIHED,
done]]] etc.

One can however use the Finite State Machine generated from the
grammar for totally different purposes: interpret each rule as a state
and the keywords as events that cause state transitions.

UNSTARTED -- start --> STARTED
STARTED -- ok --> FINISHED
STARTED -- cancel --> ABANDONED
FINISHED -- done --> .
ABANDONED -- done --> .

That's basically the same formal language with a different, more
intuitive notation.










From nazia.zaman11 at gmail.com  Mon May 25 01:31:24 2009
From: nazia.zaman11 at gmail.com (nazia)
Date: Sun, 24 May 2009 22:31:24 -0700 (PDT)
Subject: Extending C++ class in python
References: <c48594af-5410-44db-b181-9b703546273b@c18g2000prh.googlegroups.com>
	<77t5u8F1i99bqU1@mid.uni-berlin.de>
Message-ID: <5cf67e15-364c-4cf3-abd9-6aab80c31ae5@b7g2000pre.googlegroups.com>

On May 24, 9:03?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> nazia schrieb:
>
> > Hi all,
> > I'm a newbie in Python and need help. Can anyone help me by explaining
> > the steps ofextendingaC++classin Python with a simple example?
> > I'm not interested to use SWIG like tools.
> > Thanks for your time.
>
> If your are not interested in using the tools provided for this task, I
> fear you won't get much help. I'd personally use SIP and can only
> recommend it.
>
> Diez

Thanks for your response.


From max at alcyone.com  Mon May 25 02:23:30 2009
From: max at alcyone.com (Erik Max Francis)
Date: Sun, 24 May 2009 23:23:30 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <mailman.694.1243232172.8015.python-list@python.org>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.535.1242945935.8015.python-list@python.org>	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>	<gvb8kn$7gm$2@lust.ihug.co.nz>	<mailman.674.1243192904.8015.python-list@python.org>	<gvd6c0$bqs$1@lust.ihug.co.nz>
	<mailman.694.1243232172.8015.python-list@python.org>
Message-ID: <7JGdnRN7Jd7_pIfXnZ2dnUVZ_uCdnZ2d@giganews.com>

Dennis Lee Bieber wrote:
> On Mon, 25 May 2009 16:21:19 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
> 
>> Interesting kind of mindset, that assumes that the opposite of "real" must 
>> be "integer" or a subset thereof...
> 
> 	No, but since PI (and e) are both transcendentals, there is NO
> representation (except by the symbols themselves) which is NOT an
> approximation.

Sure there are; you can just use other symbolic representations.  In 
fact, there are trivially an infinite number of them; e, e^1, 1/(1/e), e 
+ 1 - 1, e + 2 - 2, etc.

Even if you restrict yourself to base-b expansions (for which the 
statement is true for integer bases), you can cheat there too:  e is 1 
in base e.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM, Y!M, Skype erikmaxfrancis
   Men and women, women and men. It will never work.
    -- Erica Jong


From bottleh20 at gmail.com  Mon May 25 02:36:39 2009
From: bottleh20 at gmail.com (Water Bottle)
Date: Mon, 25 May 2009 02:36:39 -0400
Subject: wxPython ICON constants
Message-ID: <c8a21b110905242336q92ae1f4i5ebe63bfe16618db@mail.gmail.com>

I've been wondering, is there a way to grab icon information just
given the type of OS? So if I wanted to grab the Firefox icon, how
would I do that since the user could have changed the default icon to
something else? Is there a library of these constants?


From __peter__ at web.de  Mon May 25 02:38:13 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 08:38:13 +0200
Subject: writing on file not until the end
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
Message-ID: <gvdec2$uu1$01$1@news.t-online.com>

Alexzive wrote:

> I am a newby with python. I wrote the following code to extract a text
> from a file and write it to another file:
> 
> linestring = open(path, 'r').read() #read all the inp file in
> linestring
> 
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)
> 
> unfortunately when I check N.txt some lines are missing (it only crop
> until "57, 0.231749688431, 0.0405121944142" but I espect the final
> line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> all the lines until "242..")
> 
> when I try Nfile.write(textN) again it writes some more lines but
> still not all!
> what is wrong whit this?

Do you check the contents of the resulting file by feeding it to another 
program? 

> 53, 0.170973146505, 0.0466686190136
> 57, 0.231749688431, 0.0405121944142
> t60, 0.250420691759, 0.0399644155193
> 58, 0.234883810317, 0.0488399925217
> 61, 0.2666025, 0.03541845
 
There's a "t" at the start of the line after the last line you claim to see, 
so maybe your input file is corrupt and your reader stumbles over that line.

Peter



From Ron.Barak at lsi.com  Mon May 25 02:43:32 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Mon, 25 May 2009 07:43:32 +0100
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <m2y6smm7lw.fsf@valheru.db3l.homeip.net>
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
	<m2y6smm7lw.fsf@valheru.db3l.homeip.net>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A251F@enbmail01.lsi.com>

Thanks David: excellent suggestions!
I couldn't really go with the shell utilities approach, as I have no say in my user environment, and thus cannot assume which binaries are install on the user's machine.
I'll try and implement your last suggestion, and see if the performance is acceptable to (human) users.
Bye,
Ron.

> -----Original Message-----
> From: David Bolen [mailto:db3l.net at gmail.com] 
> Sent: Monday, May 25, 2009 01:58
> To: python-list at python.org
> Subject: Re: A fast way to read last line of gzip archive ?
> 
> "Barak, Ron" <Ron.Barak at lsi.com> writes:
> 
> > I thought maybe someone has a way to unzip just the end 
> portion of the 
> > archive (instead of the whole archive), as only the last part is 
> > needed for reading the last line.
> 
> The problem is that gzip compressed output has no reliable 
> intermediate break points that you can jump to and just start 
> decompressing without having worked through the prior data.
> 
> In your specific code, using readlines() is probably not 
> ideal as it will create the full list containing all of the 
> decoded file contents in memory only to let you pick the last 
> one.  So a small optimization would be to just iterate 
> through the file (directly or by calling
> readline()) until you reach the last line.
> 
> However, since you don't care about the bulk of the file, but 
> only need to work with the final line in Python, this is an 
> activity that could be handled more efficiently handled with 
> external tools, as you need not involve much intepreter time 
> to actually decompress/discard the bulk of the file.
> 
> For example, on my system, comparing these two cases:
> 
>     # last.py
> 
>     import gzip
>     import sys
> 
>     in_file = gzip.open(sys.argv[1],'r')
>     for line in in_file:
>         pass
>     print 'Last:', line
> 
> 
>     # last-popen.py
> 
>     import sys
>     from subprocess import Popen, PIPE
> 
>     # Implement gzip -dc <file> | tail -1
>     gzip = Popen(['gzip', '-dc', sys.argv[1]], stdout=PIPE)
>     tail = Popen(['tail', '-1'], stdin=gzip.stdout, stdout=PIPE)
>     line = tail.communicate()[0]
>     print 'Last:', line
> 
> with an ~80MB log file compressed to about 8MB resulted in 
> last.py taking about 26 seconds, while last-popen took about 
> 1.7s.  Both resulted in the same value in "line".  As long as 
> you have local binaries for gzip/tail (such as Cygwin or 
> MingW or equivalent) this works fine on Windows systems too.
> 
> If you really want to keep everything in Python, then I'd 
> suggest working to optimize the "skip" portion of the task, 
> trying to decompress the bulk of the file as quickly as 
> possible.  For example, one possibility would be something like:
> 
>     # last-chunk.py
>     
>     import gzip
>     import sys
>     from cStringIO import StringIO
> 
>     in_file = gzip.open(sys.argv[1],'r')
> 
>     chunks = ['', '']
>     while 1:
>         chunk = in_file.read(1024*1024)
>         if not chunk:
>             break
>         del chunks[0]
>         chunks.append(chunk)
> 
>     data = StringIO(''.join(chunks))
>     for line in data:
>         pass
>     print 'Last:', line
> 
> with the idea that you decode about a MB at a time, holding 
> onto the final two chunks (in case the actual final chunk 
> turns out to be smaller than one of your lines), and then 
> only process those for lines.  There's probably some room for 
> tweaking the mechanism for holding onto just the last two 
> chunks, but I'm not sure it will make a major difference in 
> performance.
> 
> In the same environment of mine as the earlier tests, the 
> above took about 2.7s.  So still much slower than the 
> external utilities in percentage terms, but in absolute 
> terms, a second or so may not be critical for you compared to 
> pure Python.
> 
> -- David
> 
> 

From simonwittber at gmail.com  Mon May 25 02:49:50 2009
From: simonwittber at gmail.com (Simon Wittber)
Date: Sun, 24 May 2009 23:49:50 -0700 (PDT)
Subject: select.poll returning strange file descriptors.
Message-ID: <6629b7b4-7705-4905-92f6-58962cfe1f62@y33g2000prg.googlegroups.com>

I'm using the poll object from select.poll to check for events on
sockets.

It seems to work, however when I call .poll() on the poll objects, I
sometimes get a fileno 1 returned, which is strange, because none of
the sockets I registered with the poll object have a fileno of 1. In
fact, the sockets all start from fileno 3 and go up from there.

Does anybody know why this is happening?


From ldo at geek-central.gen.new_zealand  Mon May 25 03:22:04 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 25 May 2009 19:22:04 +1200
Subject: Ted Dziuba
Message-ID: <gvdgut$i3k$1@lust.ihug.co.nz>

<http://www.theregister.co.uk/2009/05/25/dziuba_microsoft_php/page2.html>:

    If you've ever had to build C extensions to Python on Windows, you can
    join me in a feeling of satisfaction that someone at Microsoft is going
    to have to figure this out. Let's call it retribution for Internet
    Explorer 6.



From simonwittber at gmail.com  Mon May 25 03:25:27 2009
From: simonwittber at gmail.com (Simon Wittber)
Date: Mon, 25 May 2009 00:25:27 -0700 (PDT)
Subject: select.poll returning strange file descriptors.
References: <6629b7b4-7705-4905-92f6-58962cfe1f62@y33g2000prg.googlegroups.com>
Message-ID: <644d317d-7d05-4882-9940-cc4e9fe4e24e@j9g2000prh.googlegroups.com>

Solved.

I was using poll.register(fileno) without any flags specfied, which
means "tell me when _anything_ happens".

Because of this, I was receiving OOB data, which seems to use strange
fileno values.

to fix this, I now use this:

poll.register(sock.fileno(), select.POLLIN|select.POLLOUT|
select.POLLERR|select.POLLHUP)



From dhananjay.c.joshi at gmail.com  Mon May 25 03:29:33 2009
From: dhananjay.c.joshi at gmail.com (Dhananjay)
Date: Mon, 25 May 2009 12:59:33 +0530
Subject: Regarding sort()
Message-ID: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>

Hello All,

I have data set as follows:

24       GLU    3       47      LYS     6       3.909233        1
42       PRO    5       785     VAL     74      4.145114     1
54       LYS    6       785     VAL     74      4.305017      1
55       LYS    6       785     VAL     74      4.291098      1
56       LYS    7       785     VAL     74      3.968647      1
58       LYS    7       772     MET     73      4.385121       1
58       LYS    7       778     MET     73      4.422980       1
58       LYS    7       779     MET     73      3.954990       1
58       LYS    7       785     VAL     74      3.420554       1
59       LYS    7       763     GLN     72      4.431955       1
59       LYS    7       767     GLN     72      3.844037       1
59       LYS    7       785     VAL     74      3.725048       1




I want to sort the data on the basis of 3rd column first and latter want to
sort the sorted data (in first step) on the basis of 6th column.

I tried sort() function but could not get the way how to use it.

I am new to programming, please tell me how can I sort.

Thanking you in advance ........

regards




-- 
--------------------------------------------------------------
Dhananjay C Joshi
Project Assistant
Lab of Structural Biology,
CDFD, Bldg.7, Gruhakalpa
5-4-399/B, Nampally
Hyderabad- 500001, India
Tel: +91-40-24749404
Fax: +91-40-24749448
--------------------------------------------------------------
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From ldo at geek-central.gen.new_zealand  Mon May 25 03:32:00 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 25 May 2009 19:32 +1200
Subject: Optimizing math functions
References: <mailman.619.1243084999.8015.python-list@python.org>
	<0033dace$0$9725$c3e8da3@news.astraweb.com>
Message-ID: <gvdhhg$i3k$3@lust.ihug.co.nz>

In message <0033dace$0$9725$c3e8da3 at news.astraweb.com>, Steven D'Aprano 
wrote:

> Minimizing functions of two variables is difficult, as a general rule.
> Nevertheless, there are tools for doing so. Check out SciPy.

The name "Marquadt-Levenberg" comes to mind. As I recall, it involved 
finding zeroes of the various partial derivatives.



From responsible7 at gmail.com  Mon May 25 03:38:30 2009
From: responsible7 at gmail.com (responsible7 at gmail.com)
Date: Mon, 25 May 2009 00:38:30 -0700 (PDT)
Subject: PureData py/pyExt into standalone python
References: <a3e7e823-2872-4a49-9d04-82058638aff3@z7g2000vbh.googlegroups.com>
	<8f3291a1-8aa4-4313-acec-2b207fdc96d2@y10g2000prc.googlegroups.com>
Message-ID: <5d329b2f-4d13-4e83-807a-ebb600b5cfe1@g19g2000yql.googlegroups.com>

Hi again,

Comments inline:
> > responsib... at gmail.com wrote:
> > Hi guys,
> > I've written some python classes for py/pyExt extensions for the "dataflow" graphical programming environment PureData.
> > My classes talk to eachother via the PureData system, and they talk to the outside world via pyPortMIDI (which enables raw MIDI data communication).

edexter wrote:
> This might be usefull do you intend to release this code??

I do, but I want to release it as self contained Python code, at the
moment there are many dependencies. Communication between the classes
relies on py/pyExt, which relies on Flext, which relies on PureData,
which relies on Tk and Wish84, and so on and so on...

The bits of code I have written are just simple "if this string of
bytes arrived, send this string to this other blob of code" so they
don't pull in any other python extensions, it's all core stuff. only
the "send this string" part involves the py/pyExt stuff.

> There are some midi libraries that may be helpful, it is hard to tell
> what you need without seeing the code

I'm already using pyPortMidi for the midi communication. I'm just
floundering a bit when it comes to understanding how to get the
classes I've written to all exist as objects in "python-land" and
communicate between one another.


From clp2 at rebertia.com  Mon May 25 03:47:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 25 May 2009 00:47:57 -0700
Subject: Regarding sort()
In-Reply-To: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
References: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
Message-ID: <50697b2c0905250047i5888f2e7n48c502c87a70a8ab@mail.gmail.com>

On Mon, May 25, 2009 at 12:29 AM, Dhananjay <dhananjay.c.joshi at gmail.com> wrote:
> Hello All,
>
> I have data set as follows:
>
> 24?????? GLU??? 3?????? 47????? LYS???? 6?????? 3.909233??????? 1
> 42?????? PRO??? 5?????? 785???? VAL???? 74????? 4.145114???? 1
> 54?????? LYS??? 6?????? 785???? VAL???? 74????? 4.305017????? 1
> 55?????? LYS??? 6?????? 785???? VAL???? 74????? 4.291098????? 1
> 56?????? LYS??? 7?????? 785???? VAL???? 74????? 3.968647????? 1
> 58?????? LYS??? 7?????? 772???? MET???? 73????? 4.385121?????? 1
> 58?????? LYS??? 7?????? 778???? MET???? 73????? 4.422980?????? 1
> 58?????? LYS??? 7?????? 779???? MET???? 73????? 3.954990?????? 1
> 58?????? LYS??? 7?????? 785???? VAL???? 74????? 3.420554?????? 1
> 59?????? LYS??? 7?????? 763???? GLN???? 72????? 4.431955?????? 1
> 59?????? LYS??? 7?????? 767???? GLN???? 72????? 3.844037?????? 1
> 59?????? LYS??? 7?????? 785???? VAL???? 74????? 3.725048?????? 1
>
>
>
>
> I want to sort the data on the basis of 3rd column first and latter want to
> sort the sorted data (in first step) on the basis of 6th column.
>
> I tried sort() function but could not get the way how to use it.
>
> I am new to programming, please tell me how can I sort.

Well, first you need to actually *parse* the data. Right now, the
lines are (apparently) just unstructured strings, which makes them
quite hard to manipulate.

#completely untested code:
afile = open("path/to/the/file", 'r')
data = []
for line in afile:
    fields = line.strip().split()
    for i in (0,2,3,5,6): #integer field indices
        fields[i] = int(fields[i])
    fields[-2] = float(fields[-2]) #float field index
    data.append(fields)
data.sort(key = lambda item: (item[2], item[5]) )


I would highly recommend you go through one or more Python tutorials
and/or read a book on Python (or programming generally).

Cheers,
Chris
-- 
http://blog.rebertia.com

From david.lyon at preisshare.net  Mon May 25 03:50:09 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Mon, 25 May 2009 03:50:09 -0400
Subject: SendMessage question
In-Reply-To: <4A174A26.20209@sina.com>
References: <4A174A26.20209@sina.com>
Message-ID: <bca307494a8858190ddf5d65b0fed04b@preisshare.net>


you might have more luck with http://pypi.python.org/pypi/SendKeys/0.3


On Sat, 23 May 2009 08:58:14 +0800, zhouhaifeng <mypromise at sina.com> wrote:
> Hi,I want to send "ctrl + A" and "ctrl + C" to a window,
> but my code can not work, who can help me ?
> 
> Thanks a lot!
> 
> hWnd = win32gui.FindWindow(None, "?pad")
> print hWnd
> if hWnd <> 0:
> point = (555, 175)
> x, y = point
> win32api.SetCursorPos(point)
> 
> win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x, y, 0, 0)
> win32api.SetCursorPos(point)
> win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0)
> 
> #ctrl + A
> win32api.SendMessage(hWnd, 0, win32con.VK_CONTROL, 0)
> win32api.Sleep(10)
> win32api.SendMessage(hWnd, 0, 65, 0)
> win32api.SendMessage(hWnd, win32con.KEYEVENTF_KEYUP, 65, 0)
> win32api.SendMessage(hWnd, win32con.KEYEVENTF_KEYUP, win32con.VK_CONTROL,
> 0)
> win32api.Sleep(10)
> 
> #ctrl + C
> win32api.SendMessage(hWnd, win32con.WM_KEYDOWN, win32con.VK_CONTROL, 0)
> win32api.Sleep(10)
> win32api.SendMessage(hWnd, win32con.WM_KEYDOWN, 67, 0)
> win32api.SendMessage(hWnd, win32con.WM_KEYUP, 67, 0)
> win32api.SendMessage(hWnd, win32con.WM_KEYUP, win32con.VK_CONTROL, 0)
> win32api.Sleep(10)


From jaime.frio at gmail.com  Mon May 25 03:51:42 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Mon, 25 May 2009 09:51:42 +0200
Subject: Regarding sort()
In-Reply-To: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
References: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
Message-ID: <97a8f1a70905250051o44266248k2f8c35c017fbf638@mail.gmail.com>

Hi Dhananjay,

Sort has several optional arguments, the function's signature is as follows:

s.sort([cmp[, key[, reverse]]])

If you store your data as a list of lists, to sort by the third column
you could do something like:

data.sort(None, lambda x : x[2])

For more complex sortings, as the one you propose, you need to define
a compare function, that determines if an object preceeds another or
not. In your case, something like:

def list_cmp( a, b) :
    if a[2] > b[2] :
        return 1
    elif a[2] < b[2] :
        return -1
    else : # a[2] == b[2]
        if a[5] > b[5] :
            return 1
        elif a[5] < b[5] :
            return -1
        else : # a[5] == b[5]
            return 0

data.sort(list_cmp)

should do the trick for you...

Jaime


On Mon, May 25, 2009 at 9:29 AM, Dhananjay <dhananjay.c.joshi at gmail.com> wrote:
> Hello All,
>
> I have data set as follows:
>
> 24?????? GLU??? 3?????? 47????? LYS???? 6?????? 3.909233??????? 1
> 42?????? PRO??? 5?????? 785???? VAL???? 74????? 4.145114???? 1
> 54?????? LYS??? 6?????? 785???? VAL???? 74????? 4.305017????? 1
> 55?????? LYS??? 6?????? 785???? VAL???? 74????? 4.291098????? 1
> 56?????? LYS??? 7?????? 785???? VAL???? 74????? 3.968647????? 1
> 58?????? LYS??? 7?????? 772???? MET???? 73????? 4.385121?????? 1
> 58?????? LYS??? 7?????? 778???? MET???? 73????? 4.422980?????? 1
> 58?????? LYS??? 7?????? 779???? MET???? 73????? 3.954990?????? 1
> 58?????? LYS??? 7?????? 785???? VAL???? 74????? 3.420554?????? 1
> 59?????? LYS??? 7?????? 763???? GLN???? 72????? 4.431955?????? 1
> 59?????? LYS??? 7?????? 767???? GLN???? 72????? 3.844037?????? 1
> 59?????? LYS??? 7?????? 785???? VAL???? 74????? 3.725048?????? 1
>
>
>
>
> I want to sort the data on the basis of 3rd column first and latter want to
> sort the sorted data (in first step) on the basis of 6th column.
>
> I tried sort() function but could not get the way how to use it.
>
> I am new to programming, please tell me how can I sort.
>
> Thanking you in advance ........
>
> regards
>
>
>
>
> --
> --------------------------------------------------------------
> Dhananjay C Joshi
> Project Assistant
> Lab of Structural Biology,
> CDFD, Bldg.7, Gruhakalpa
> 5-4-399/B, Nampally
> Hyderabad- 500001, India
> Tel: +91-40-24749404
> Fax: +91-40-24749448
> --------------------------------------------------------------
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From ldo at geek-central.gen.new_zealand  Mon May 25 03:52:50 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 25 May 2009 19:52:50 +1200
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.525.1242941777.8015.python-list@python.org>
	<gvas9k$vvf$1@lust.ihug.co.nz>
	<mailman.702.1243237468.8015.python-list@python.org>
Message-ID: <gvdioj$iso$1@lust.ihug.co.nz>

In message <mailman.702.1243237468.8015.python-list at python.org>, Dave Angel 
wrote:

> Lawrence D'Oliveiro wrote:
>
>> Anybody remember a certain Prof William Kahan from Berkeley ...
>>   
> I remember the professor.  He was responsible for large parts of the
> Intel 8087 specification, which later got mostly codified as IEEE 754.

The 8087 was poorly designed. It was stack-based, which caused all kinds of 
performance problems that never really went away, though I think Intel tried 
to patch over them with various SSE extensions. I believe AMD64 does have 
proper floating-point registers, at last.

Apple's implementation of IEEE 754 was so rigorous that, when Motorola 
introduced the 68881, which implemented a few of the "shortcuts" that Kahan 
reviled in his foreword, Apple added a patch to its SANE library to restore 
correct results, with the usual controversy over whether the performance 
loss was worth it. If you didn't think it was, you could always use the 
68881 instructions directly.



From gagsl-py2 at yahoo.com.ar  Mon May 25 04:03:20 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 25 May 2009 05:03:20 -0300
Subject: How to send a compsite key to window
References: <4A154B42.1040306@sina.com>
Message-ID: <op.uuer5lv0x6zn5v@gabriel.sleipnir-bsas>

En Thu, 21 May 2009 09:38:26 -0300, zhouhaifeng <mypromise at sina.com>
escribi?:

> just like "ctrl + A",
>
> I want to select all the text in a window, now , I operate right menu to
> get it, but it can not work all the time.
> so I want to send "ctrl + a" to the window

I'd do it in a different way: asuming it is an edit control, send the
control an EM_SETSEL message with start=0, end=-1.
http://msdn.microsoft.com/en-us/library/bb761661(VS.85).aspx

-- 
Gabriel Genellina



From __peter__ at web.de  Mon May 25 04:05:59 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 10:05:59 +0200
Subject: Regarding sort()
References: <mailman.697.1243236580.8015.python-list@python.org>
Message-ID: <gvdjgk$pkm$00$1@news.t-online.com>

Dhananjay wrote:

> Hello All,
> 
> I have data set as follows:
> 
> 24       GLU    3       47      LYS     6       3.909233        1
> 42       PRO    5       785     VAL     74      4.145114     1
> 54       LYS    6       785     VAL     74      4.305017      1
> 55       LYS    6       785     VAL     74      4.291098      1
> 56       LYS    7       785     VAL     74      3.968647      1
> 58       LYS    7       772     MET     73      4.385121       1
> 58       LYS    7       778     MET     73      4.422980       1
> 58       LYS    7       779     MET     73      3.954990       1
> 58       LYS    7       785     VAL     74      3.420554       1
> 59       LYS    7       763     GLN     72      4.431955       1
> 59       LYS    7       767     GLN     72      3.844037       1
> 59       LYS    7       785     VAL     74      3.725048       1
> 
> 
> 
> 
> I want to sort the data on the basis of 3rd column first and latter want
> to sort the sorted data (in first step) on the basis of 6th column.
> 
> I tried sort() function but could not get the way how to use it.
> 
> I am new to programming, please tell me how can I sort.
> 
> Thanking you in advance ........

>>> data = """24       GLU    3       47      LYS     6       3.909233        
1
... 42       PRO    5       785     VAL     74      4.145114     1
... 54       LYS    6       785     VAL     74      4.305017      1
... 55       LYS    6       785     VAL     74      4.291098      1
... 56       LYS    7       785     VAL     74      3.968647      1
... 58       LYS    7       772     MET     73      4.385121       1
... 58       LYS    7       778     MET     73      4.422980       1
... 58       LYS    7       779     MET     73      3.954990       1
... 58       LYS    7       785     VAL     74      3.420554       1
... 59       LYS    7       763     GLN     72      4.431955       1
... 59       LYS    7       767     GLN     72      3.844037       1
... 59       LYS    7       785     VAL     74      3.725048       1
... """
>>> rows = data.splitlines()
>>> rows.sort(key=lambda line: int(line.split()[5]))
>>> rows.sort(key=lambda line: int(line.split()[2]))
>>> print "\n".join(rows)
24       GLU    3       47      LYS     6       3.909233        1
42       PRO    5       785     VAL     74      4.145114     1
54       LYS    6       785     VAL     74      4.305017      1
55       LYS    6       785     VAL     74      4.291098      1
59       LYS    7       763     GLN     72      4.431955       1
59       LYS    7       767     GLN     72      3.844037       1
58       LYS    7       772     MET     73      4.385121       1
58       LYS    7       778     MET     73      4.422980       1
58       LYS    7       779     MET     73      3.954990       1
56       LYS    7       785     VAL     74      3.968647      1
58       LYS    7       785     VAL     74      3.420554       1
59       LYS    7       785     VAL     74      3.725048       1

Python's list.sort() is "stable". Therefore you can sort by the 6th column 
first, and then by the third. Rows with the same value in the third column 
will not change their relative position.

To calculate the value for the n-th row you can either use the above lambda 
or the equivalent function:

def sixth_column(row):
    columns = row.split() # split by whitespace
    column = columns[5] # sixth column
    return int(column) # convert to integer

If you don't convert to integer a row with "10" comes before a row with "2" 
in the column which is probably not what you want.

Peter



From __peter__ at web.de  Mon May 25 04:13:03 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 10:13:03 +0200
Subject: Regarding sort()
References: <mailman.697.1243236580.8015.python-list@python.org>
	<gvdjgk$pkm$00$1@news.t-online.com>
Message-ID: <gvdjts$qgk$00$1@news.t-online.com>

Peter Otten wrote:

>>>> rows = data.splitlines()
>>>> rows.sort(key=lambda line: int(line.split()[5]))
>>>> rows.sort(key=lambda line: int(line.split()[2]))
>>>> print "\n".join(rows)

Of course you can also sort in a single step:

>>> rows = data.splitlines()
>>> def key(row):
...     columns = row.split()
...     return int(columns[2]), int(columns[5])
...
>>> rows.sort(key=key)
>>> print "\n".join(rows)

Peter



From clp2 at rebertia.com  Mon May 25 04:15:26 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 25 May 2009 01:15:26 -0700
Subject: Regarding sort()
In-Reply-To: <97a8f1a70905250051o44266248k2f8c35c017fbf638@mail.gmail.com>
References: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
	<97a8f1a70905250051o44266248k2f8c35c017fbf638@mail.gmail.com>
Message-ID: <50697b2c0905250115kb3bd9abq662c09ecd29763cb@mail.gmail.com>

On Mon, May 25, 2009 at 12:51 AM, Jaime Fernandez del Rio
<jaime.frio at gmail.com> wrote:
> Hi Dhananjay,
>
> Sort has several optional arguments, the function's signature is as follows:
>
> s.sort([cmp[, key[, reverse]]])
>
> If you store your data as a list of lists, to sort by the third column
> you could do something like:
>
> data.sort(None, lambda x : x[2])
>
> For more complex sortings, as the one you propose, you need to define
> a compare function, that determines if an object preceeds another or
> not. In your case, something like:

Erm, using a compare function rather than a key function slows down
sorting /significantly/. In fact, the `cmp` parameter to list.sort()
has been *removed* in Python 3.0 because of this.

Also, top-posting is evil. Please avoid it in the future.

Cheers,
Chris
-- 
http://blog.rebertia.com


From zasaconsulting at gmail.com  Mon May 25 04:30:01 2009
From: zasaconsulting at gmail.com (Alessandro)
Date: Mon, 25 May 2009 01:30:01 -0700 (PDT)
Subject: writing on file not until the end
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
	<gvdec2$uu1$01$1@news.t-online.com>
Message-ID: <2264b63d-1ab5-4773-8b2c-4fdfb574c7b9@z5g2000yqn.googlegroups.com>

On May 25, 8:38 am, Peter Otten <__pete... at web.de> wrote:
> Alexzive wrote:
> > I am a newby with python. I wrote the following code to extract a text
> > from a file and write it to another file:
>
> > linestring = open(path, 'r').read() #read all the inp file in
> > linestring
>
> > i=linestring.index("*NODE")
> > i=linestring.index("E",i)
> > e=linestring.index("*",i+10)
> > textN = linestring[i+2:e-1] # crop the ELement+nodes list
> > Nfile = open("N.txt", "w")
> > Nfile.write(textN)
>
> > unfortunately when I check N.txt some lines are missing (it only crop
> > until "57, 0.231749688431, 0.0405121944142" but I espect the final
> > line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> > all the lines until "242..")
>
> > when I try Nfile.write(textN) again it writes some more lines but
> > still not all!
> > what is wrong whit this?
>
> Do you check the contents of the resulting file by feeding it to another
> program?
>
> > 53, 0.170973146505, 0.0466686190136
> > 57, 0.231749688431, 0.0405121944142
> > t60, 0.250420691759, 0.0399644155193
> > 58, 0.234883810317, 0.0488399925217
> > 61, 0.2666025, 0.03541845
>
> There's a "t" at the start of the line after the last line you claim to see,
> so maybe your input file is corrupt and your reader stumbles over that line.
>
> Peter

Thank you all for replying.

- yes, I oversaw the "t" at "60, 0.250420691759, 0.0399644155193". I
then removed it for the following tests
- changing from "e-1" to "e" apparently solved the problem, BUT I then
realized it was just because a second access to the file (still open)
seems to be the real solution --> after Nfile.close() e retrying with
"e" instead of "e-1" the problem is still there.
- I also tryied to inizialize e and i to zero --> nothing changes
- until now, the only solution which works is to repeat the code while
the file is still open, which means a quite redundant code:

linestring = open(path, 'r').read()
i=linestring.index("*NODE")
i=linestring.index("E",i)
e=linestring.index("*",i+10)
textN = linestring[i+2:e-1] # crop the ELement+nodes list
Nfile = open("N.txt", "w")
Nfile.write(textN)

linestring = open(path, 'r').read()
i=linestring.index("*NODE")
i=linestring.index("E",i)
e=linestring.index("*",i+10)
textN = linestring[i+2:e-1] # crop the ELement+nodes list
Nfile = open("N.txt", "w")
Nfile.write(textN)

Alex


From mohammed.abosalim at gmail.com  Mon May 25 04:40:57 2009
From: mohammed.abosalim at gmail.com (abosalim)
Date: Mon, 25 May 2009 01:40:57 -0700 (PDT)
Subject: Need Help
References: <5f238e07-8d39-4bb4-8c6a-cbd56412fb5a@c36g2000yqn.googlegroups.com>
	<m2y6sm6tak.fsf@cs.uu.nl>
	<pan.2009.05.25.02.39.37@REMOVE.THIS.cybersource.com.au>
Message-ID: <7f5b3761-ff6c-4448-81da-a0bc2eced6c9@l12g2000yqo.googlegroups.com>

On May 25, 5:39?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 25 May 2009 00:16:19 +0200, Piet van Oostrum wrote:
> > By the way, it is better to add python code as attachment instead of
> > inline text because some news software might fold the lines like in your
> > posting, making it difficult to reconstruct the code.
>
> Except that some news software might not show the attachment at all.
>
> --
> Steven

I modified the method,but it can't identified it.(self.res=textcorrect
(self.string)
NameError: global name 'textcorrect' is not defined)
This is what i done:


import re, collections
from Tkinter import *
from nltk_lite import tokenize
class Ex3:
    def __init__(self, master):
        self.frame = Frame(master)
        self.frame.pack()
        self.field = Entry(self.frame)
        self.field.pack(side=TOP)
        self.contents = StringVar()
        self.field.config(text=self.contents)
        self.stop = Button(self.frame, text="Exit", fg="red",
command=self.frame.quit)
        self.stop.pack(side=RIGHT)
        self.enter = Button(self.frame, text="Correct", fg="black",
command=self.new)
        self.enter.pack(side=LEFT)



    def words(text): return re.findall('[a-z]+', text.lower())
    def train(features):
        model = collections.defaultdict(lambda: 1)
        for f in features:
            model[f] += 1
            return model
        NWORDS = train(words(file('big1.txt').read()))
        alphabet = 'abcdefghijklmnopqrstuvwxyz'
    def edits1(word):
        s = [(word[:i], word[i:]) for i in range(len(word) + 1)]
        deletes = [a + b[1:] for a, b in s if b]
        transposes = [a + b[1] + b[0] + b[2:] for a, b in s if len(b)
>1]
        replaces = [a + c + b[1:] for a, b in s for c in alphabet if
b]
        inserts = [a + c + b for a, b in s for c in alphabet]
        return set(deletes + transposes + replaces + inserts)
    def known_edits2(word):
        return set(e2 for e1 in edits1(word) for e2 in edits1(e1) if
e2 in NWORDS)
    def known(words):
        return set(w for w in words if w in NWORDS)
    def correct(word):
        candidates = known([word]) or known(edits1(word)) or
known_edits2(word) or [word]
        return max(candidates, key=lambda w: NWORDS[w])
    def textcorrect(str):
        s=[]
        for i in tokenize.whitespace(str):
            s.append(correct(i))
            result= " ".join(s)
            return result
    def new(self):
        self.string = self.contents.get()
        #pass contents of textfield to textcorrect()method above
        self.res=textcorrect(self.string)
        self.frame2 = Frame()
        self.frame2.pack()
        self.words = Label(self.frame2, text=self.res, fg="blue", font=
("Arial", 16))
        self.words.pack()

root = Tk()
Ex3 = Ex3(root)
root.mainloop()















From andrea.gavana at gmail.com  Mon May 25 04:41:16 2009
From: andrea.gavana at gmail.com (Infinity77)
Date: Mon, 25 May 2009 01:41:16 -0700 (PDT)
Subject: Multiprocessing and file I/O
References: <ab7dd7b6-40dd-46a7-8bda-d30d9bfbb7df@m17g2000vbi.googlegroups.com>
	<mailman.654.1243167010.8015.python-list@python.org>
	<8e21bc22-ad0e-4c18-85e2-df6e84d1afc3@n8g2000vbb.googlegroups.com>
	<448f0706-546a-4945-aae3-00a1dcd9ea8d@c36g2000yqn.googlegroups.com>
Message-ID: <6d01b1b9-d0d5-4e5c-8fad-580c0bf27941@z19g2000vbz.googlegroups.com>

Hi Paul & All,

On May 24, 4:16?pm, Paul Boddie <p... at boddie.org.uk> wrote:
> On 24 Mai, 16:13, Infinity77 <andrea.gav... at gmail.com> wrote:
>
>
>
> > No, the processing of the data is fast enough, as it is very simple.
> > What I was asking is if anyone could share an example of using
> > multiprocessing to read a file, along the lines I described above.
>
> Take a look at this section in an article about multi-threaded
> processing of large files:
>
> http://effbot.org/zone/wide-finder.htm#a-multi-threaded-python-solution

Thank you for the pointer, I have read the article and the follow-ups
with much interest... it's unfortunate Python is no more on the first
place though :-D
I'll see if I can come up with a faster implementation of my (f2py-
fortran-based) Python module using multiprocessing.

Thank you.

Andrea.


From charlietaylor at users.sourceforge.net  Mon May 25 04:48:03 2009
From: charlietaylor at users.sourceforge.net (Charlie)
Date: Mon, 25 May 2009 08:48:03 +0000 (UTC)
Subject: Optimizing math functions
References: <mailman.619.1243084999.8015.python-list@python.org>	<0033dace$0$9725$c3e8da3@news.astraweb.com>
	<loom.20090524T083337-764@post.gmane.org>
	<4A193DD5.4090401@hotmail.com>
Message-ID: <loom.20090525T082837-787@post.gmane.org>

Esmail <ebonak <at> hotmail.com> writes:

> 
> Charlie wrote:
> > 
> > You might also look at:
> > http://pyparasol.sourceforge.net/example_1.html
> 
> Thanks for this lead, I had never heard of parasol before. Do you know
> if this also works under Linux? The docs mention only the Windows platform,
> but given that this is Python perhaps it is save to assume this would also
> work under Linux?
> 
> Esmail
> 

It might work under Linux, however, it was developed under Windows and, to my
knowledge, has never been tested on a Linux machine.  Basic operation only
depends on installations of matplotlib, numpy, and scipy.  Those packages are
all available on Linux.

If you try it, I'd like to know the outcome.

The parasol options to launch Microsoft Office apps Excel, Power Point, and
Word; or the ray tracing app POV-Ray, will very likely fail.

Charlie



From __peter__ at web.de  Mon May 25 04:52:30 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 10:52:30 +0200
Subject: writing on file not until the end
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
	<gvdec2$uu1$01$1@news.t-online.com>
	<2264b63d-1ab5-4773-8b2c-4fdfb574c7b9@z5g2000yqn.googlegroups.com>
Message-ID: <gvdm7q$dud$01$1@news.t-online.com>

Alessandro wrote:

> - until now, the only solution which works is to repeat the code while
> the file is still open, which means a quite redundant code:
> 
> linestring = open(path, 'r').read()
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)
> 
> linestring = open(path, 'r').read()
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)

Is this the complete script? The only effect of the second copy of your code 
above is that it implicitly closes the first Nfile. Otherwise it is cargo 
cult.

Peter 



From sjmachin at lexicon.net  Mon May 25 04:58:38 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 25 May 2009 01:58:38 -0700 (PDT)
Subject: writing on file not until the end
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
	<gvdec2$uu1$01$1@news.t-online.com>
	<2264b63d-1ab5-4773-8b2c-4fdfb574c7b9@z5g2000yqn.googlegroups.com>
Message-ID: <e6727293-bbc4-4977-93c5-44dde89a8929@d19g2000prh.googlegroups.com>

On May 25, 6:30?pm, Alessandro <zasaconsult... at gmail.com> wrote:
> On May 25, 8:38 am, Peter Otten <__pete... at web.de> wrote:
>
>
>
> > Alexzive wrote:
> > > I am a newby with python. I wrote the following code to extract a text
> > > from a file and write it to another file:
>
> > > linestring = open(path, 'r').read() #read all the inp file in
> > > linestring
>
> > > i=linestring.index("*NODE")
> > > i=linestring.index("E",i)
> > > e=linestring.index("*",i+10)
> > > textN = linestring[i+2:e-1] # crop the ELement+nodes list
> > > Nfile = open("N.txt", "w")
> > > Nfile.write(textN)
>
> > > unfortunately when I check N.txt some lines are missing (it only crop
> > > until "57, 0.231749688431, 0.0405121944142" but I espect the final
> > > line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> > > all the lines until "242..")
>
> > > when I try Nfile.write(textN) again it writes some more lines but
> > > still not all!
> > > what is wrong whit this?
>
> > Do you check the contents of the resulting file by feeding it to another
> > program?
>
> > > 53, 0.170973146505, 0.0466686190136
> > > 57, 0.231749688431, 0.0405121944142
> > > t60, 0.250420691759, 0.0399644155193
> > > 58, 0.234883810317, 0.0488399925217
> > > 61, 0.2666025, 0.03541845
>
> > There's a "t" at the start of the line after the last line you claim to see,
> > so maybe your input file is corrupt and your reader stumbles over that line.
>
> > Peter
>
> Thank you all for replying.
>
> - yes, I oversaw the "t" at "60, 0.250420691759, 0.0399644155193". I
> then removed it for the following tests
> - changing from "e-1" to "e" apparently solved the problem, BUT I then
> realized it was just because a second access to the file (still open)
> seems to be the real solution --> after Nfile.close() e retrying with
> "e" instead of "e-1" the problem is still there.
> - I also tryied to inizialize e and i to zero --> nothing changes
> - until now, the only solution which works is to repeat the code while
> the file is still open, which means a quite redundant code:
>
> linestring = open(path, 'r').read()
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)

Insert here:
Nfile.close()

Remove the redundant second pass.

> linestring = open(path, 'r').read()
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1] # crop the ELement+nodes list
> Nfile = open("N.txt", "w")
> Nfile.write(textN)




From niklas.norrthon at hotmail.com  Mon May 25 05:22:11 2009
From: niklas.norrthon at hotmail.com (Niklas Norrthon)
Date: Mon, 25 May 2009 02:22:11 -0700 (PDT)
Subject: Can I get a technical explanation on the following error
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
	<4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>
	<1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
	<mailman.679.1243200974.8015.python-list@python.org>
	<4a1a1084$0$19026$4c5ecfc7@fe1.usenet.com>
Message-ID: <91e577a6-964a-412c-888f-02ffd6bca699@o18g2000yqi.googlegroups.com>

On 25 Maj, 05:29, Jim Garrison <j... at acm.org> wrote:
> And as an interesting exercise, try
>
> print r'test \'
> print r'test \\'
>
> Because of the way raw string parsing is defined, neither of these will
> pass the parser. ?In fact, a raw string cannot have a backslash as
> its last character.

Tried it:
>>> r'test \'
SyntaxError: EOL while scanning string literal

>>> r'test \\'
'test \\\\'

Second one is accepted. See the language reference section 2.4.1 as of
why; http://www.python.org/doc/current/reference/lexical_analysis.html?highlight=raw%20strings#string-literals

/Niklas Norrthon


From zasaconsulting at gmail.com  Mon May 25 05:35:10 2009
From: zasaconsulting at gmail.com (Alessandro)
Date: Mon, 25 May 2009 02:35:10 -0700 (PDT)
Subject: writing on file not until the end
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>
	<gvdec2$uu1$01$1@news.t-online.com>
	<2264b63d-1ab5-4773-8b2c-4fdfb574c7b9@z5g2000yqn.googlegroups.com>
	<e6727293-bbc4-4977-93c5-44dde89a8929@d19g2000prh.googlegroups.com>
Message-ID: <fdde3592-6741-416b-8904-d659c91dfb42@3g2000yqk.googlegroups.com>

On May 25, 10:58 am, John Machin <sjmac... at lexicon.net> wrote:
> On May 25, 6:30 pm, Alessandro <zasaconsult... at gmail.com> wrote:
>
>
>
> > On May 25, 8:38 am, Peter Otten <__pete... at web.de> wrote:
>
> > > Alexzive wrote:
> > > > I am a newby with python. I wrote the following code to extract a text
> > > > from a file and write it to another file:
>
> > > > linestring = open(path, 'r').read() #read all the inp file in
> > > > linestring
>
> > > > i=linestring.index("*NODE")
> > > > i=linestring.index("E",i)
> > > > e=linestring.index("*",i+10)
> > > > textN = linestring[i+2:e-1] # crop the ELement+nodes list
> > > > Nfile = open("N.txt", "w")
> > > > Nfile.write(textN)
>
> > > > unfortunately when I check N.txt some lines are missing (it only crop
> > > > until "57, 0.231749688431, 0.0405121944142" but I espect the final
> > > > line to be "242, 0.2979675, 0.224605896461". I check textN and it has
> > > > all the lines until "242..")
>
> > > > when I try Nfile.write(textN) again it writes some more lines but
> > > > still not all!
> > > > what is wrong whit this?
>
> > > Do you check the contents of the resulting file by feeding it to another
> > > program?
>
> > > > 53, 0.170973146505, 0.0466686190136
> > > > 57, 0.231749688431, 0.0405121944142
> > > > t60, 0.250420691759, 0.0399644155193
> > > > 58, 0.234883810317, 0.0488399925217
> > > > 61, 0.2666025, 0.03541845
>
> > > There's a "t" at the start of the line after the last line you claim to see,
> > > so maybe your input file is corrupt and your reader stumbles over that line.
>
> > > Peter
>
> > Thank you all for replying.
>
> > - yes, I oversaw the "t" at "60, 0.250420691759, 0.0399644155193". I
> > then removed it for the following tests
> > - changing from "e-1" to "e" apparently solved the problem, BUT I then
> > realized it was just because a second access to the file (still open)
> > seems to be the real solution --> after Nfile.close() e retrying with
> > "e" instead of "e-1" the problem is still there.
> > - I also tryied to inizialize e and i to zero --> nothing changes
> > - until now, the only solution which works is to repeat the code while
> > the file is still open, which means a quite redundant code:
>
> > linestring = open(path, 'r').read()
> > i=linestring.index("*NODE")
> > i=linestring.index("E",i)
> > e=linestring.index("*",i+10)
> > textN = linestring[i+2:e-1] # crop the ELement+nodes list
> > Nfile = open("N.txt", "w")


I closed and restarted the python console. Now this code (with added
"Nfile.close()" at the end) seems to work properly:

linestring = open(path, 'r').read()
i=linestring.index("*NODE")
i=linestring.index("E",i)
e=linestring.index("*",i+10)
textN = linestring[i+2:e-1]
Nfile = open("N.txt", "w")
Nfile.write(textN)
Nfile.close()

thanks, Alex


From jaime.frio at gmail.com  Mon May 25 05:44:02 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Mon, 25 May 2009 11:44:02 +0200
Subject: Regarding sort()
In-Reply-To: <50697b2c0905250115kb3bd9abq662c09ecd29763cb@mail.gmail.com>
References: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
	<97a8f1a70905250051o44266248k2f8c35c017fbf638@mail.gmail.com>
	<50697b2c0905250115kb3bd9abq662c09ecd29763cb@mail.gmail.com>
Message-ID: <97a8f1a70905250244o5129e21dxb50e04531e5bb430@mail.gmail.com>

On Mon, May 25, 2009 at 10:15 AM, Chris Rebert <clp2 at rebertia.com> wrote:
> Erm, using a compare function rather than a key function slows down
> sorting /significantly/. In fact, the `cmp` parameter to list.sort()
> has been *removed* in Python 3.0 because of this.

Makes a lot of sense, as you only have to run the slow python function
N times, rather than doing it N log N times...

So I guess I have also learned today that the internal cmp can handle
lists and tuples properly, i.e (1,7) > (1,5), definitely a much neater
way of doing things: the reasons are starting to pile to fare 2.6
goodbye and move on to 3.0...

>
> Also, top-posting is evil. Please avoid it in the future.

Must be the mad scientist wanting to take over the world in me. ;-)

Note taken...

Jaime

>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>



-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From pdpinheiro at gmail.com  Mon May 25 05:47:14 2009
From: pdpinheiro at gmail.com (pdpi)
Date: Mon, 25 May 2009 02:47:14 -0700 (PDT)
Subject: Can I get a technical explanation on the following error
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
Message-ID: <5a397ae7-4a67-44ef-9214-e0834de3aa72@e20g2000vbc.googlegroups.com>

On May 24, 6:41?pm, grocery_stocker <cdal... at gmail.com> wrote:
> How come something like '\' ?causes an error? Here is what I mean.
>
> [cdalten at localhost ~]$ python
> Python 2.6.2 (r262:71600, May ?3 2009, 17:04:44)
> [GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> print "test \"
>
> ? File "<stdin>", line 1
> ? ? print "test \"
> ? ? ? ? ? ? ? ? ?^
> SyntaxError: EOL while scanning string literal
>
>
>
> I mean, isn't the '\' a character just like the letter 't'?

Ask yourself: 'How would I tell Python to print the " character when
it's used as the string delimitation character?'. Unlike us (you
probably didn't even blink at the usage of ' in "it's" versus its
usage as quote delimiters in that sentence), computers can't quite
tell usage from context. So you have to come up with a way to express
ourselves. Many languages use the \ character as an escape character,
which modifies the meaning of the next character in a string. \n, \t,
\" are all common. Other languages use other conventions -- I program
ABAP professionally, and it uses ' as the string delimiter, and '' as
a literal -- so a string with one single ' is expressed as ''''.

The python interpreter isn't doing any bit magic here, it's just
reading a \ character followed by a " character and changing its
interpretation of " appropriately.


From neilcrighton at gmail.com  Mon May 25 05:50:39 2009
From: neilcrighton at gmail.com (Neil Crighton)
Date: Mon, 25 May 2009 09:50:39 +0000 (UTC)
Subject: Regarding sort()
References: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>
Message-ID: <loom.20090525T093458-170@post.gmane.org>

Dhananjay <dhananjay.c.joshi <at> gmail.com> writes:

> I want to sort the data on the basis of 3rd column first and latter want to 
> sort the sorted data (in first step) on the basis of 6th column.I tried 
> sort() function but could not get the way how to use it.I am new to 
> programming, please tell me how can I sort.Thanking you in advance 


If you want to use numpy, you can do this (in version 1.2 or above):

Assuming the columns of data you posted are in a text file called temp.txt,

>>> import numpy as np

Read the file to a numpy array and convert to int, float or string as
appropriate. Each column is given a name - 'f0' is the first column, 'f1' is the
second column, and so on.

>>> data = np.genfromtxt('temp.txt', dtype=None)

Sort rows by the 3rd column, and if the 3rd column values are the same, sort by
the 6th column:

>>> data.sort(order=['f2', 'f5'])



Neil





From mail at microcorp.co.za  Mon May 25 05:59:39 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 25 May 2009 11:59:39 +0200
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com><mailman.535.1242945935.8015.python-list@python.org><1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com><7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com><gvb8kn$7gm$2@lust.ihug.co.nz>
	<gvc6np$plr$1@ger.gmane.org>
Message-ID: <001301c9dd1f$8bf53f40$0d00a8c0@Hendrik>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote:


> On Sun, 24 May 2009 22:47:51 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
> 
> 
> > As for exactitude in physics, Gregory Chaitin among others has been trying 
> > to rework physics to get rid of real numbers altogether.
> 
> By decreeing that the value of PI is 3?

naah - that would be too crude, even for a physicist - pi is 22//7..

;-)

- Hendrik



From jos.koot at telefonica.net  Mon May 25 06:05:37 2009
From: jos.koot at telefonica.net (jos koot)
Date: Mon, 25 May 2009 03:05:37 -0700 (PDT)
Subject: INVITATION FLIB: Fringe/Functional Languages In Barcelona user group.
Message-ID: <417be943-e353-43ff-8689-b3afd8e6ae26@l32g2000vba.googlegroups.com>

INVITATION
We, (Jose A. Ortega Ruiz jao at gnu.org, Andy Wingo wingo at pobox.com and
Jos Koot jos.koot at telefonica.net) have scheduled a meeting in
Barcelona (Spain) with the intention to form a user group FLIB: Fringe/
Functional Languages In Barcelona. Everyone who is interested in
shaping this group is invited to share us.

June 10 2009 at 7.30 PM
Calle del Pi 3 Principal Interior (first floor)
Barcelona
Spain

Preliminary program

Welcome.
Short discussion about what FLIB should be and should not be.
Jose: communication about FUEL (Factors Ultimate Emacs Library)
Jos : 5 minute click/lightning talk on his recent experiences with
PLT's redex library.
You: 5 minut click/lightning talk.
Many more of you: 5 minut click/lightning talks.
Informal meeting in the conference room or in a bar or simple
restaurant within walking distance.

The preferred language is English, but click talks can also be in
Castiliano (Spanish) or in Catala.
If you intend to come, let us know by email, please, in order that we
can estimate the number of participants.
If you intend to do a click talk, please let us know too.

Please forward this invitation to relevant mailing lists we may have
missed.
Hope to meet you on June the tenth.

jao at gnu.org
wingo at pobox.com
jos.koot at telefonica.net


From giovanni.gherdovich at sophia.inria.fr  Mon May 25 06:22:03 2009
From: giovanni.gherdovich at sophia.inria.fr (Giovanni Gherdovich)
Date: Mon, 25 May 2009 12:22:03 +0200
Subject: what I would like python.el to do (and maybe it does)
Message-ID: <4A1A714B.1010408@sophia.inria.fr>

Hello everybody,

basically I'm writing here since I cannot
make my python.el work (a major mode for writing
python with emacs), but I would also like to share
my user experience and tell you what I think
an emacs mode should do, why do I like them
and hopefully have some feedbacks to see if I
misunderstood/underestimate something.


== 1) my python.el doesn't behave very well ==

I learnt somewhere
http://www.emacswiki.org/emacs/PythonMode
that there are two major emacs mode for python around:
python-mode.el and python.el.
Asking my Emacs 22.3.1 about the variable load-path
issuing
'C-h v load-path RET
I see that
/usr/share/emacs/22.3/lisp/progmodes
is in that path; there I find a file named
python.elc
which I assume to be some kind of emacs lisp bytecode
since is pretty much unreadable.

So I searched the web for a plain version of it,
finding that the feature I use more, i.e.
sending a line of a text file to the
python buffer for evaluation (see below), correspond
to the key sequence

\C-c\C-c

(well, it's python-send-buffer, so maybe not a single
line but the whole buffer; the closest to my needs, anyway).
However: I open my Emacs, issue M-x python-mode,
then M-x run-python to have the interpreter in
a second buffer, I type something in the
first buffer and then C-c C-c, but nothing happens.

Am I missing something?
Do I have any hope of having some sort of
send-line-to-python-buffer function working?


== 2) How do I use emacs modes for interpreted languages ==

Please note that what follows is just the personal perspective
of an unexperienced user.

Syntax highlighting is a great thing, but is not as critical
to me as the feature I describe below.

When I work with interpreted languages, I really hate doing it
in the shell; after 20 commands I easily lose control on
what happens and on which definitions are around.

I use Emacs instead, so that I can have two buffers; in the
first I type my expressions, in the second I evaluate them
using some key bindings so that I can easily send the text
from the first buffer to the second one line by line.

In this way I can easily refactor my code, and eventually package it
in a script if I like.
Usually after a while the intepreter buffer is a big mess,
so I restart it but my code is safe and sound in the first buffer.

To do so, I don't really need a major mode, I admit; I just need
to put the following code in my .emacs:

(fset 'send-line-other-window
  [?\C-a ?\C- ?\C-e ?M-w right
   ?C-x ?o ?C-y return ?\C-x ?o])
(global-set-key [f11] 'send-line-other-window)

Then I open emacs, C-x 2 to have a second buffer,
C-x o to switch to it and M-x shell to run bash in it.
Then, in the case of python, I run "python" in the
bash buffer. Then I type my code in the first and with F11
I send lines to the interpreter.

But since i like to do it The Right Way, I would
like to let the python-mode worry about this...

Sorry if this is just a bunch of obvious thoughts to most of you.

Regards,
Giovanni



From jarausch at igpm.rwth-aachen.de  Mon May 25 06:59:21 2009
From: jarausch at igpm.rwth-aachen.de (Helmut Jarausch)
Date: Mon, 25 May 2009 12:59:21 +0200
Subject: email scanning for X-Spam-Score
Message-ID: <77vc0bF1ikvrgU1@mid.dfncis.de>

Hi,

my emails received from our mailing system contain a field like

X-Spam-Score: -2.2

Given the full email message in 'msg'
I've tried
   mailmsg = email.message_from_string(msg)
   SPAM_CORE = mailmsg['X-Spam-Score']
but it doesn't work.
What am I missing?

Many thanks for a hint,
Helmut.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From ebonak at hotmail.com  Mon May 25 07:08:46 2009
From: ebonak at hotmail.com (Esmail)
Date: Mon, 25 May 2009 07:08:46 -0400
Subject: Python -> R?
In-Reply-To: <15e4667e0905241932p2a47b08aj9dc79aaeadf32078@mail.gmail.com>
References: <gv90n1$1h4$1@ger.gmane.org>
	<15e4667e0905241932p2a47b08aj9dc79aaeadf32078@mail.gmail.com>
Message-ID: <4A1A7C3E.3000105@hotmail.com>

Dan Yamins wrote:
> 
> 
>     If so, what are you using? I have read about RPy, is that a good
>     solution?
> 
> 
> 
> Yes, I think it's quite a good solution.  It's not exactly 100% as 
> convenient as working directly in R, but that's IMO more than 
> compensated by the ability to use Python's syntax.   
> 
> Make sure you use Rpy2 (the successor to Rpy) -- I find it significantly 
> better.   However, the online documentation is in IMHO a little thin -- 
> at least, in terms of examples -- so I once wrote up a little 5-minute 
> tutorial to show a friend how to use Rpy2.  I've attached it to this 
> message -- you may find it useful.

thanks! I played around just a bit with RPy yesterday, but I had no
idea there was Rpy2 .. I'll be sure to take a look.

Best,
Esmail



From ebonak at hotmail.com  Mon May 25 07:10:11 2009
From: ebonak at hotmail.com (Esmail)
Date: Mon, 25 May 2009 07:10:11 -0400
Subject: Python -> R?
In-Reply-To: <42eea1a3-742c-4cc9-aaf9-54b7305dfc39@j18g2000prm.googlegroups.com>
References: <mailman.623.1243088434.8015.python-list@python.org>
	<42eea1a3-742c-4cc9-aaf9-54b7305dfc39@j18g2000prm.googlegroups.com>
Message-ID: <gvduaj$o3b$2@ger.gmane.org>

edexter wrote:
> 
> I was playing around with a r sound module and looking at the graphic
> stuff and I have downloaded the rpy thing but I have never used
> it....  I have been looking for a good excuse to use it...  It looks
> like it could be useful for graphing stuff or maybe alogrithmic
> (spelling I am sure) composition...  The R people have a publication
> somewhat like the python papers where you might find something
> intresting.

Thanks .. I tried out a few simple things with RPy yesterday (calling
a few functions and some simple plots) and it seemed to work ok.

Esmail



From __peter__ at web.de  Mon May 25 07:17:32 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 13:17:32 +0200
Subject: email scanning for X-Spam-Score
References: <77vc0bF1ikvrgU1@mid.dfncis.de>
Message-ID: <gvduno$cur$03$1@news.t-online.com>

Helmut Jarausch wrote:

> my emails received from our mailing system contain a field like
> 
> X-Spam-Score: -2.2
> 
> Given the full email message in 'msg'
> I've tried
>    mailmsg = email.message_from_string(msg)
>    SPAM_CORE = mailmsg['X-Spam-Score']
> but it doesn't work.

What do you mean by "doesn't work"?

> What am I missing?

No idea. It seems to "work" over here:

Python 2.6.2 (release26-maint, Apr 19 2009, 01:58:18)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import email
>>> spam = open("spam.txt").read()
>>> m = email.message_from_string(spam)
>>> m["X-Spam-Score"]
'15.0 (+++++++++++++++)'

Peter



From jarausch at igpm.rwth-aachen.de  Mon May 25 07:23:58 2009
From: jarausch at igpm.rwth-aachen.de (Helmut Jarausch)
Date: Mon, 25 May 2009 13:23:58 +0200
Subject: email scanning for X-Spam-Score
In-Reply-To: <gvduno$cur$03$1@news.t-online.com>
References: <77vc0bF1ikvrgU1@mid.dfncis.de> <gvduno$cur$03$1@news.t-online.com>
Message-ID: <4A1A7FCE.4030005@igpm.rwth-aachen.de>

Peter Otten wrote:
> Helmut Jarausch wrote:
> 
>> my emails received from our mailing system contain a field like
>>
>> X-Spam-Score: -2.2
>>
>> Given the full email message in 'msg'
>> I've tried
>>    mailmsg = email.message_from_string(msg)
>>    SPAM_CORE = mailmsg['X-Spam-Score']
>> but it doesn't work.
> 
> What do you mean by "doesn't work"?
> 
>> What am I missing?
> 
> No idea. It seems to "work" over here:
> 
> Python 2.6.2 (release26-maint, Apr 19 2009, 01:58:18)
> [GCC 4.3.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import email
>>>> spam = open("spam.txt").read()
>>>> m = email.message_from_string(spam)
>>>> m["X-Spam-Score"]
> '15.0 (+++++++++++++++)'
> 
> Peter
> 

Oh yes, thanks,
my test email was quite long and so I overlooked it contained 2 emails instead
of just one.

Sorry for the noise,
Helmut.


-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From roy at panix.com  Mon May 25 07:27:37 2009
From: roy at panix.com (Roy Smith)
Date: Mon, 25 May 2009 07:27:37 -0400
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
	<gvd1id$8jj$2@lust.ihug.co.nz>
Message-ID: <roy-50FE2E.07273725052009@news.panix.com>

In article <gvd1id$8jj$2 at lust.ihug.co.nz>,
 Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:

> In message <roy-3C4DED.09214724052009 at news.panix.com>, Roy Smith wrote:
> 
> > In article <gvb8fn$7gm$1 at lust.ihug.co.nz>,
> >  Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
> > 
> >> The right thing to do is try to ensure that all your connections are
> >> properly closed at shutdown. That may not be enough (if your server
> >> crashes due to bugs), so the other thing you need to do is retry the
> >> socket open, say, at 30-second intervals, until it succeeds.
> > 
> > That may be a reasonable thing to do for production code, but when you're
> > building and debugging a server, it's a real pain to not be able to
> > restart it quickly whenever you want (or need) to.
> 
> On the contrary, I run exactly the same logic--and that includes socket-
> handling logic--in both test and production servers. How else can I be sure 
> it'll work properly in production?

If running without SO_REUASEADDR works for you, that's great.  I was just 
pointing out how it can be useful in cases such as the OP's, where he's 
getting bind errors when he restarts his server.


From arnodel at googlemail.com  Mon May 25 07:59:59 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 25 May 2009 12:59:59 +0100
Subject: what I would like python.el to do (and maybe it does)
References: <mailman.714.1243247520.8015.python-list@python.org>
Message-ID: <m2prdx2y0w.fsf@googlemail.com>

Giovanni Gherdovich <giovanni.gherdovich at sophia.inria.fr> writes:

> Hello everybody,

Hi

> (well, it's python-send-buffer, so maybe not a single
> line but the whole buffer; the closest to my needs, anyway).
> However: I open my Emacs, issue M-x python-mode,
> then M-x run-python to have the interpreter in
> a second buffer, I type something in the
> first buffer and then C-c C-c, but nothing happens.

What platform are you on?

I use Aquamacs (which is a packaged Emacs for macos X, based on GNU
Emacs 22.3.1) and for me C-c C-c works.  It executes the content of the
current buffer in a Python interactive buffer called *Python* (which it
creates if it doesn't exist).

-- 
Arnaud


From petshmidt at googlemail.com  Mon May 25 08:10:04 2009
From: petshmidt at googlemail.com (someone)
Date: Mon, 25 May 2009 05:10:04 -0700 (PDT)
Subject: formating query with empty parameter
Message-ID: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>

Hello!

if one of parameter in values is empty, I'm getting
TypeError: not enough arguments for format string

But how to handle such situation? It is ok for DB, that some of values
are empty.



def __insert(self, data):
        query = """
            BEGIN;
                INSERT INTO table
                    (a,  b,  c,  d,  e,  f,  g)
                    VALUES
                    (%s, %s, %s, %s, %s, %s, %s);
            COMMIT;
            """
        values = [
            data['a'],
            data['b'],
            data['c'],
            data['d'],
            data['e'],
            data['f'],
            data['g']
            ]
        self.db.execute(query, *values)



Thanks Pet


From deets at nospam.web.de  Mon May 25 08:15:03 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 25 May 2009 14:15:03 +0200
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
Message-ID: <77vga0F1hgiujU1@mid.uni-berlin.de>

someone wrote:

> Hello!
> 
> if one of parameter in values is empty, I'm getting
> TypeError: not enough arguments for format string
> 
> But how to handle such situation? It is ok for DB, that some of values
> are empty.
> 
> 
> 
> def __insert(self, data):
>         query = """
>             BEGIN;
>                 INSERT INTO table
>                     (a,  b,  c,  d,  e,  f,  g)
>                     VALUES
>                     (%s, %s, %s, %s, %s, %s, %s);
>             COMMIT;
>             """
>         values = [
>             data['a'],
>             data['b'],
>             data['c'],
>             data['d'],
>             data['e'],
>             data['f'],
>             data['g']
>             ]
>         self.db.execute(query, *values)

You need to pass 

None

then as that parameter.

Diez


From petshmidt at googlemail.com  Mon May 25 08:25:16 2009
From: petshmidt at googlemail.com (Pet)
Date: Mon, 25 May 2009 05:25:16 -0700 (PDT)
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com> 
	<77vga0F1hgiujU1@mid.uni-berlin.de>
Message-ID: <eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>

On May 25, 2:15?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> someone wrote:
> > Hello!
>
> > if one of parameter in values is empty, I'm getting
> > TypeError: not enough arguments for format string
>
> > But how to handle such situation? It is ok for DB, that some of values
> > are empty.
>
> > def __insert(self, data):
> > ? ? ? ? query = """
> > ? ? ? ? ? ? BEGIN;
> > ? ? ? ? ? ? ? ? INSERT INTO table
> > ? ? ? ? ? ? ? ? ? ? (a, ?b, ?c, ?d, ?e, ?f, ?g)
> > ? ? ? ? ? ? ? ? ? ? VALUES
> > ? ? ? ? ? ? ? ? ? ? (%s, %s, %s, %s, %s, %s, %s);
> > ? ? ? ? ? ? COMMIT;
> > ? ? ? ? ? ? """
> > ? ? ? ? values = [
> > ? ? ? ? ? ? data['a'],
> > ? ? ? ? ? ? data['b'],
> > ? ? ? ? ? ? data['c'],
> > ? ? ? ? ? ? data['d'],
> > ? ? ? ? ? ? data['e'],
> > ? ? ? ? ? ? data['f'],
> > ? ? ? ? ? ? data['g']
> > ? ? ? ? ? ? ]
> > ? ? ? ? self.db.execute(query, *values)
>
> You need to pass
>
> None

Hi,

thanks for reply.
Unfortunately, it doesn't work. Still getting TypeError: not enough
arguments for format string


>
> then as that parameter.
>
> Diez



From petshmidt at googlemail.com  Mon May 25 08:45:28 2009
From: petshmidt at googlemail.com (Pet)
Date: Mon, 25 May 2009 05:45:28 -0700 (PDT)
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com> 
	<77vga0F1hgiujU1@mid.uni-berlin.de>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
Message-ID: <c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com>

On May 25, 2:25?pm, Pet <petshm... at googlemail.com> wrote:
> On May 25, 2:15?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
>
>
>
>
> > someone wrote:
> > > Hello!
>
> > > if one of parameter in values is empty, I'm getting
> > > TypeError: not enough arguments for format string
>
> > > But how to handle such situation? It is ok for DB, that some of values
> > > are empty.
>
> > > def __insert(self, data):
> > > ? ? ? ? query = """
> > > ? ? ? ? ? ? BEGIN;
> > > ? ? ? ? ? ? ? ? INSERT INTO table
> > > ? ? ? ? ? ? ? ? ? ? (a, ?b, ?c, ?d, ?e, ?f, ?g)
> > > ? ? ? ? ? ? ? ? ? ? VALUES
> > > ? ? ? ? ? ? ? ? ? ? (%s, %s, %s, %s, %s, %s, %s);
> > > ? ? ? ? ? ? COMMIT;
> > > ? ? ? ? ? ? """
> > > ? ? ? ? values = [
> > > ? ? ? ? ? ? data['a'],
> > > ? ? ? ? ? ? data['b'],
> > > ? ? ? ? ? ? data['c'],
> > > ? ? ? ? ? ? data['d'],
> > > ? ? ? ? ? ? data['e'],
> > > ? ? ? ? ? ? data['f'],
> > > ? ? ? ? ? ? data['g']
> > > ? ? ? ? ? ? ]
> > > ? ? ? ? self.db.execute(query, *values)
>
> > You need to pass
>
> > None
>
> Hi,
>
> thanks for reply.
> Unfortunately, it doesn't work. Still getting TypeError: not enough
> arguments for format string
>
>
>
>
>
> > then as that parameter.
>
> > Diez

Sorry, for previous quick post. Actually it works now, I've missed
some other parameter in list

Thanks again!


From __peter__ at web.de  Mon May 25 08:50:32 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 14:50:32 +0200
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
	<77vga0F1hgiujU1@mid.uni-berlin.de>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
Message-ID: <gve463$4gr$02$1@news.t-online.com>

Pet wrote:

> > someone wrote:
> > > Hello!
> >
> > > if one of parameter in values is empty, I'm getting
> > > TypeError: not enough arguments for format string
> >
> > > But how to handle such situation? It is ok for DB, that some of values
> > > are empty.
> >
> > > def __insert(self, data):
> > >         query = """
> > >             BEGIN;
> > >                 INSERT INTO table
> > >                     (a,  b,  c,  d,  e,  f,  g)
> > >                     VALUES
> > >                     (%s, %s, %s, %s, %s, %s, %s);
> > >             COMMIT;
> > >             """
> > >         values = [
> > >             data['a'],
> > >             data['b'],
> > >             data['c'],
> > >             data['d'],
> > >             data['e'],
> > >             data['f'],
> > >             data['g']
> > >             ]
> > >         self.db.execute(query, *values)
> >
> > You need to pass
> >
> > None
> 
> Hi,
> 
> thanks for reply.
> Unfortunately, it doesn't work. Still getting TypeError: not enough
> arguments for format string
> 

The code you posted doesn't match that error message. You have to invoke 
cursor.execute() as 

cursor.execute(query, values) # correct

, not 

cursor.execute(query, *values) # wrong

or

cursor.execute(query % values) # wrong

The length of values must match the number of "%s" occurences in the sql 
query, but as Diez indicated you may pass None for every field that allows a 
NULL value in the table.

Peter




From python.list at tim.thechases.com  Mon May 25 09:26:29 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 25 May 2009 08:26:29 -0500
Subject: formating query with empty parameter
In-Reply-To: <c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com>
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
	<77vga0F1hgiujU1@mid.uni-berlin.de>	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
	<c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com>
Message-ID: <4A1A9C85.8060908@tim.thechases.com>

>>>> if one of parameter in values is empty, I'm getting
>>>> TypeError: not enough arguments for format string
>>>> But how to handle such situation? It is ok for DB, that some of values
>>>> are empty.
>>>> def __insert(self, data):
>>>>         query = """
>>>>             BEGIN;
>>>>                 INSERT INTO table
>>>>                     (a,  b,  c,  d,  e,  f,  g)
>>>>                     VALUES
>>>>                     (%s, %s, %s, %s, %s, %s, %s);
>>>>             COMMIT;
>>>>             """
>>>>         values = [
>>>>             data['a'],
>>>>             data['b'],
>>>>             data['c'],
>>>>             data['d'],
>>>>             data['e'],
>>>>             data['f'],
>>>>             data['g']
>>>>             ]
>>>>         self.db.execute(query, *values)
> 
> Sorry, for previous quick post. Actually it works now, I've missed
> some other parameter in list

To stave off this problem, I often use:

   values = [
    data['a'],
    data['b'],
    data['c'],
    data['d'],
    data['e'],
    data['f'],
    data['g'],
    ]
   params = ', '.join('%s' for _ in values)
   query = """
     BEGIN;
       INSERT INTO table
         (a,b,c,d,e,f,g)
       VALUES (%s);
     COMMIT;
     """ % params
   self.db.execute(query, values)

If the indexes are named the same as the fieldnames, or you have 
a mapping of them, I tend to use something like

   field_map = {
     # dictionary_index: database_fieldname
     # data['a'] -> table.f1
     'a': 'f1',
     'b': 'f2',
     'c': 'f3',
     # ...
     }
   name_value_pairs = (
     (data[k], v)
     for k,v
     in fieldmap.iteritems())
   values, fieldnames = zip(*name_value_pairs)
   # may want to do fieldname escaping here:
   fieldname_string = ', '.join(fieldnames)
   params = ', '.join('%s' for _ in ordering)

   query = """
     BEGIN;
       INSERT INTO table (%s) VALUES (%s);
     COMMIT;
     """ % (fieldname_string, params)
   self.db.execute(query, values)

-tkc






From james at agentultra.com  Mon May 25 09:44:45 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 25 May 2009 09:44:45 -0400
Subject: what I would like python.el to do (and maybe it does)
References: <mailman.714.1243247520.8015.python-list@python.org>
Message-ID: <85ljolfgaa.fsf@agentultra.com>

Giovanni Gherdovich <giovanni.gherdovich at sophia.inria.fr> writes:

> Hello everybody,
>
> basically I'm writing here since I cannot
> make my python.el work (a major mode for writing
> python with emacs), but I would also like to share
> my user experience and tell you what I think
> an emacs mode should do, why do I like them
> and hopefully have some feedbacks to see if I
> misunderstood/underestimate something.
>
>
> == 1) my python.el doesn't behave very well ==
>
> I learnt somewhere
> http://www.emacswiki.org/emacs/PythonMode
> that there are two major emacs mode for python around:
> python-mode.el and python.el.
> Asking my Emacs 22.3.1 about the variable load-path
> issuing
> 'C-h v load-path RET
> I see that
> /usr/share/emacs/22.3/lisp/progmodes
> is in that path; there I find a file named
> python.elc
> which I assume to be some kind of emacs lisp bytecode
> since is pretty much unreadable.
>
> So I searched the web for a plain version of it,
> finding that the feature I use more, i.e.
> sending a line of a text file to the
> python buffer for evaluation (see below), correspond
> to the key sequence
>
> \C-c\C-c
>
> (well, it's python-send-buffer, so maybe not a single
> line but the whole buffer; the closest to my needs, anyway).
> However: I open my Emacs, issue M-x python-mode,
> then M-x run-python to have the interpreter in
> a second buffer, I type something in the
> first buffer and then C-c C-c, but nothing happens.
>
> Am I missing something?
> Do I have any hope of having some sort of
> send-line-to-python-buffer function working?
>
>
> == 2) How do I use emacs modes for interpreted languages ==
>
> Please note that what follows is just the personal perspective
> of an unexperienced user.
>
> Syntax highlighting is a great thing, but is not as critical
> to me as the feature I describe below.
>
> When I work with interpreted languages, I really hate doing it
> in the shell; after 20 commands I easily lose control on
> what happens and on which definitions are around.
>
> I use Emacs instead, so that I can have two buffers; in the
> first I type my expressions, in the second I evaluate them
> using some key bindings so that I can easily send the text
> from the first buffer to the second one line by line.
>
> In this way I can easily refactor my code, and eventually package it
> in a script if I like.
> Usually after a while the intepreter buffer is a big mess,
> so I restart it but my code is safe and sound in the first buffer.
>
> To do so, I don't really need a major mode, I admit; I just need
> to put the following code in my .emacs:
>
> (fset 'send-line-other-window
>  [?\C-a ?\C- ?\C-e ?M-w right
>   ?C-x ?o ?C-y return ?\C-x ?o])
> (global-set-key [f11] 'send-line-other-window)
>
> Then I open emacs, C-x 2 to have a second buffer,
> C-x o to switch to it and M-x shell to run bash in it.
> Then, in the case of python, I run "python" in the
> bash buffer. Then I type my code in the first and with F11
> I send lines to the interpreter.
>
> But since i like to do it The Right Way, I would
> like to let the python-mode worry about this...
>
> Sorry if this is just a bunch of obvious thoughts to most of you.
>
> Regards,
> Giovanni

I find that it does work, but unlike SLIME for lisp, it just imports the statement.

It confused me at first, but basically the interpreter doesn't provide
any feedback to emacs.

Try opening a python source file (start python-mode if you don't have
an autoload hook) and do C-c C-z to bring up the Python
interpreter. Type in a simple assignment statement (like "a = 1 + 2"
without the quotes) into the source file. Then just C-c C-c as
usual. I never get any feedback. Just C-x o to the interpreter and
print out the variable you just defined. It should be there.


From davea at ieee.org  Mon May 25 10:06:17 2009
From: davea at ieee.org (Dave Angel)
Date: Mon, 25 May 2009 10:06:17 -0400
Subject: writing on file not until the end
In-Reply-To: <fdde3592-6741-416b-8904-d659c91dfb42@3g2000yqk.googlegroups.com>
References: <18dd42af-51f0-49ad-a4c6-0f323ef11a43@z14g2000yqa.googlegroups.com>	<gvdec2$uu1$01$1@news.t-online.com>	<2264b63d-1ab5-4773-8b2c-4fdfb574c7b9@z5g2000yqn.googlegroups.com>	<e6727293-bbc4-4977-93c5-44dde89a8929@d19g2000prh.googlegroups.com>
	<fdde3592-6741-416b-8904-d659c91dfb42@3g2000yqk.googlegroups.com>
Message-ID: <4A1AA5D9.1010501@ieee.org>

Alessandro wrote:
> <snip>
>
> I closed and restarted the python console. Now this code (with added
> "Nfile.close()" at the end) seems to work properly:
>
> linestring = open(path, 'r').read()
> i=linestring.index("*NODE")
> i=linestring.index("E",i)
> e=linestring.index("*",i+10)
> textN = linestring[i+2:e-1]
> Nfile = open("N.txt", "w")
> Nfile.write(textN)
> Nfile.close()
>
> thanks, Alex
>
>   
Others had already mentioned close(), but I didn't bother, since it 
would be automatically closed when you exited the function, or finished 
the script.  I never dreamed you were running all this from the 
interpreter.  If so, why didn't you copy the prompts?

The close is best done explicitly, but it is implicit when the Nfile 
goes out of scope, or gets reassigned (like the new open).

However, the bug I described is still there.  Study the following, and 
try it:

def test():
    buf = "abcdefghijklmnopqrstg000"
    i = buf.index("d")
    e = buf.index("g", i+10)
    buf2 = buf[i+2:e-1]
    print buf2

running it produces the string:

fghijklmnopqrs

Notice the 't' is missing.  If you're deliberately doing that, fine.  
But I doubt it.





From jaime.frio at gmail.com  Mon May 25 10:07:13 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Mon, 25 May 2009 16:07:13 +0200
Subject: exec statement with/without prior compile...
Message-ID: <97a8f1a70905250707m413e428ei63494285248d0afa@mail.gmail.com>

These weekend I've been tearing down to pieces Michele Simionato's
decorator module, that builds signature preserving decorators. At the
heart of it all there is a dynamically generated function, which works
something similar to this...

...
    src = """def function(a,b,c) :\n    return _caller_(a,b,c)\n"""
    evaldict = {'_caller_' : _caller_}
    code = compile(src, '<string>', 'single')
    exec code in evaldict
    new_func = evaldict[function]
...

I have found fooling around with this code, that the compile step can
be completely avoided and go for a single:

    exec src in evaldict

Now, I'm sure there is a good reason for that additional step, but I
haven't been able to find what the difference between both approaches
is.

And since I'm asking, could something similar, i.e. defining a new
function and get a handle to it, be achieved with eval?

Thanks in advance,

Jaime Fern?ndez
http://numericalrecipes.blogspot.com

-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From piet at cs.uu.nl  Mon May 25 10:09:41 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Mon, 25 May 2009 16:09:41 +0200
Subject: Need Help
References: <5f238e07-8d39-4bb4-8c6a-cbd56412fb5a@c36g2000yqn.googlegroups.com>
	<m2y6sm6tak.fsf@cs.uu.nl>
	<pan.2009.05.25.02.39.37@REMOVE.THIS.cybersource.com.au>
	<7f5b3761-ff6c-4448-81da-a0bc2eced6c9@l12g2000yqo.googlegroups.com>
Message-ID: <m2skit6zq2.fsf@cs.uu.nl>

>>>>> abosalim <mohammed.abosalim at gmail.com> (a) wrote:

>a> I modified the method,but it can't identified it.(self.res=textcorrect
>a> (self.string)
>a> NameError: global name 'textcorrect' is not defined)
>a> This is what i done:

[...]
>a> class Ex3:
[...]
>a>     def textcorrect(str):
>a>         s=[]
>a>         for i in tokenize.whitespace(str):
>a>             s.append(correct(i))
>a>             result= " ".join(s)
>a>             return result
>a>     def new(self):
>a>         self.string = self.contents.get()
>a>         #pass contents of textfield to textcorrect()method above
>a>         self.res=textcorrect(self.string)
>a>         self.frame2 = Frame()
>a>         self.frame2.pack()
>a>         self.words = Label(self.frame2, text=self.res, fg="blue", font=
>a> ("Arial", 16))
>a>         self.words.pack()

So now you have put textcorrect inside the class Ex3. But that means
that it is an instance method now. So you need to call 
     self.textcorrect(self.string) 
otherwise it is not known. But then you must also give it a self
parameter. The same applies to the other methods, so in textcorrect you
have to call self.correct(i)  and give correct a self parameter. etc.

Or you make them all static methods and use Ex3.textcorrect().

I don't think putting all the methods in a class is a good idea, as you
only need one instance of it and most methods are static-like anyway.
Putting it in a class is a Java-ism. A module for this is more Pythonic.

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From piet at cs.uu.nl  Mon May 25 10:12:22 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Mon, 25 May 2009 16:12:22 +0200
Subject: Can I get a technical explanation on the following error
References: <485e96dc-f48f-43c1-8e50-7173ba933092@d2g2000pra.googlegroups.com>
	<4a19960b$0$31869$9b4e6d93@newsspool3.arcor-online.net>
	<1457a097-079c-41c3-b1c5-a728cee25610@c7g2000prc.googlegroups.com>
	<mailman.679.1243200974.8015.python-list@python.org>
	<4a1a1084$0$19026$4c5ecfc7@fe1.usenet.com>
Message-ID: <m2my916zll.fsf@cs.uu.nl>

>>>>> Jim Garrison <jhg at acm.org> (JG) wrote:

>JG> And as an interesting exercise, try
>JG> print r'test \'
>JG> print r'test \\'

>JG> Because of the way raw string parsing is defined, neither of these will
>JG> pass the parser.  In fact, a raw string cannot have a backslash as
>JG> its last character.

Cannot have an odd number of backslashes as its last characters.

>>> print r'test \\'
test \\
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From Roland.Puntaier at br-automation.com  Mon May 25 10:43:26 2009
From: Roland.Puntaier at br-automation.com (Roland Puntaier)
Date: Mon, 25 May 2009 16:43:26 +0200
Subject: [ANN] vim patch to support python3 interface
In-Reply-To: <4A1548A1.1040101@gmail.com>
Message-ID: <OFFBD29A21.3489DD39-ONC12575C1.004F291B-C12575C1.0050DFE4@br-automation.com>

vim_use at googlegroups.com schrieb am 21.05.2009 14:27:13:

> 
> On 12/05/09 18:35, Roland Puntaier wrote:
> > Hello,
> >
> > I have ported vim's python interface (if_python.c) to the python3 
C-API.
> >
> > The changed files are:
> > - Makefile (for linux)
> > - Make_mvc.mak (for windows)
> > - if_python3.c is a new file for the python3 related sources. it is 
based
> > on if_python.c.
> >
> > All of them are in the ``src`` subdirectory.
> [...]
> 
> Make_mvc.mak is not, and by far, the only makefile used by people who 
> build Vim on Windows.
> [...]

My solution regarding the build process is rather provisionary.
I'll work out a solution that encompasses all makefiles.

I'll send a follow-up.

Best regards,
        Roland



From Ron.Barak at lsi.com  Mon May 25 10:52:22 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Mon, 25 May 2009 15:52:22 +0100
Subject: How to pickle a 'PySwigObject' ?
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A2527@enbmail01.lsi.com>

Hi,

I have a wxPython application that is creating a subprocess that performs a lengthy log analysis.
Currently, the subprocess is displaying its results using its own MainLoop().
I want to display the subprocess' results using the parent process' MainLoop().

I tried to pickle the class instance that is displaying the subprocess results (so the subclass could be sent to the parent process for display), but I get the following error:

cPickle.PicklingError: Can't pickle <type 'PySwigObject'>: attribute lookup __builtin__.PySwigObject failed
A code that demonstrate the problem is:

$ cat pickle_test.py
#!/usr/bin/env python

#import pickle
import cPickle as pickle
import wx

class ListControl(wx.Frame):

    def __init__(self, parent, id):
        wx.Frame.__init__(self,parent,id)

if __name__ == "__main__":

    app = wx.App(redirect=False)
    output = pickle.dumps(ListControl(None, -1),2)

Any ideas what could be changed to let me pickle the class ?

Thanks,
Ron.

$ cat -n pickle_test.py
     1  #!/usr/bin/env python
     2
     3  #import pickle
     4  import cPickle as pickle
     5  import wx
     6
     7  class ListControl(wx.Frame):
     8
     9      def __init__(self, parent, id):
    10          wx.Frame.__init__(self,parent,id)
    11
    12  if __name__ == "__main__":
    13
    14      app = wx.App(redirect=False)
    15      output = pickle.dumps(ListControl(None, -1),2)

$ python -u pickle_test.py
Traceback (most recent call last):
  File "pickle_test.py", line 15, in <module>
    output = pickle.dumps(ListControl(None, -1),2)
cPickle.PicklingError: Can't pickle <type 'PySwigObject'>: attribute lookup __builtin__.PySwigObject failed

$
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From petshmidt at googlemail.com  Mon May 25 10:53:06 2009
From: petshmidt at googlemail.com (Pet)
Date: Mon, 25 May 2009 07:53:06 -0700 (PDT)
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com> 
	<77vga0F1hgiujU1@mid.uni-berlin.de>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
	<gve463$4gr$02$1@news.t-online.com>
Message-ID: <edb8840a-136a-497a-92b2-42b533020bba@m19g2000yqk.googlegroups.com>

On May 25, 2:50?pm, Peter Otten <__pete... at web.de> wrote:
> Pet wrote:
> > > someone wrote:
> > > > Hello!
>
> > > > if one of parameter in values is empty, I'm getting
> > > > TypeError: not enough arguments for format string
>
> > > > But how to handle such situation? It is ok for DB, that some of values
> > > > are empty.
>
> > > > def __insert(self, data):
> > > > ? ? ? ? query = """
> > > > ? ? ? ? ? ? BEGIN;
> > > > ? ? ? ? ? ? ? ? INSERT INTO table
> > > > ? ? ? ? ? ? ? ? ? ? (a, ?b, ?c, ?d, ?e, ?f, ?g)
> > > > ? ? ? ? ? ? ? ? ? ? VALUES
> > > > ? ? ? ? ? ? ? ? ? ? (%s, %s, %s, %s, %s, %s, %s);
> > > > ? ? ? ? ? ? COMMIT;
> > > > ? ? ? ? ? ? """
> > > > ? ? ? ? values = [
> > > > ? ? ? ? ? ? data['a'],
> > > > ? ? ? ? ? ? data['b'],
> > > > ? ? ? ? ? ? data['c'],
> > > > ? ? ? ? ? ? data['d'],
> > > > ? ? ? ? ? ? data['e'],
> > > > ? ? ? ? ? ? data['f'],
> > > > ? ? ? ? ? ? data['g']
> > > > ? ? ? ? ? ? ]
> > > > ? ? ? ? self.db.execute(query, *values)
>
> > > You need to pass
>
> > > None
>
> > Hi,
>
> > thanks for reply.
> > Unfortunately, it doesn't work. Still getting TypeError: not enough
> > arguments for format string
>
> The code you posted doesn't match that error message. You have to invoke
> cursor.execute() as
>
> cursor.execute(query, values) # correct
>
> , not
>
> cursor.execute(query, *values) # wrong

as far as I know it is not wrong, at least for pyPgSQL it takes values
and escapes properly preventing sql injections

>
> or
>
> cursor.execute(query % values) # wrong
>
> The length of values must match the number of "%s" occurences in the sql
> query, but as Diez indicated you may pass None for every field that allows a
> NULL value in the table.
>
> Peter



From petshmidt at googlemail.com  Mon May 25 10:54:12 2009
From: petshmidt at googlemail.com (Pet)
Date: Mon, 25 May 2009 07:54:12 -0700 (PDT)
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com> 
	<77vga0F1hgiujU1@mid.uni-berlin.de>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
	<c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com> 
	<mailman.717.1243258005.8015.python-list@python.org>
Message-ID: <c7508c6f-8723-4e9d-ae32-55ce9a42404e@e21g2000yqb.googlegroups.com>

On May 25, 3:26?pm, Tim Chase <python.l... at tim.thechases.com> wrote:
> >>>> if one of parameter in values is empty, I'm getting
> >>>> TypeError: not enough arguments for format string
> >>>> But how to handle such situation? It is ok for DB, that some of values
> >>>> are empty.
> >>>> def __insert(self, data):
> >>>> ? ? ? ? query = """
> >>>> ? ? ? ? ? ? BEGIN;
> >>>> ? ? ? ? ? ? ? ? INSERT INTO table
> >>>> ? ? ? ? ? ? ? ? ? ? (a, ?b, ?c, ?d, ?e, ?f, ?g)
> >>>> ? ? ? ? ? ? ? ? ? ? VALUES
> >>>> ? ? ? ? ? ? ? ? ? ? (%s, %s, %s, %s, %s, %s, %s);
> >>>> ? ? ? ? ? ? COMMIT;
> >>>> ? ? ? ? ? ? """
> >>>> ? ? ? ? values = [
> >>>> ? ? ? ? ? ? data['a'],
> >>>> ? ? ? ? ? ? data['b'],
> >>>> ? ? ? ? ? ? data['c'],
> >>>> ? ? ? ? ? ? data['d'],
> >>>> ? ? ? ? ? ? data['e'],
> >>>> ? ? ? ? ? ? data['f'],
> >>>> ? ? ? ? ? ? data['g']
> >>>> ? ? ? ? ? ? ]
> >>>> ? ? ? ? self.db.execute(query, *values)
>
> > Sorry, for previous quick post. Actually it works now, I've missed
> > some other parameter in list
>
> To stave off this problem, I often use:
>
> ? ?values = [
> ? ? data['a'],
> ? ? data['b'],
> ? ? data['c'],
> ? ? data['d'],
> ? ? data['e'],
> ? ? data['f'],
> ? ? data['g'],
> ? ? ]
> ? ?params = ', '.join('%s' for _ in values)
> ? ?query = """
> ? ? ?BEGIN;
> ? ? ? ?INSERT INTO table
> ? ? ? ? ?(a,b,c,d,e,f,g)
> ? ? ? ?VALUES (%s);
> ? ? ?COMMIT;
> ? ? ?""" % params
> ? ?self.db.execute(query, values)
>

Why do you pass values to execute() if you already have your query
formatted?

> If the indexes are named the same as the fieldnames, or you have
> a mapping of them, I tend to use something like
>
> ? ?field_map = {
> ? ? ?# dictionary_index: database_fieldname
> ? ? ?# data['a'] -> table.f1
> ? ? ?'a': 'f1',
> ? ? ?'b': 'f2',
> ? ? ?'c': 'f3',
> ? ? ?# ...
> ? ? ?}
> ? ?name_value_pairs = (
> ? ? ?(data[k], v)
> ? ? ?for k,v
> ? ? ?in fieldmap.iteritems())
> ? ?values, fieldnames = zip(*name_value_pairs)
> ? ?# may want to do fieldname escaping here:
> ? ?fieldname_string = ', '.join(fieldnames)
> ? ?params = ', '.join('%s' for _ in ordering)
>
> ? ?query = """
> ? ? ?BEGIN;
> ? ? ? ?INSERT INTO table (%s) VALUES (%s);
> ? ? ?COMMIT;
> ? ? ?""" % (fieldname_string, params)
> ? ?self.db.execute(query, values)
>
> -tkc



From petshmidt at googlemail.com  Mon May 25 11:39:07 2009
From: petshmidt at googlemail.com (someone)
Date: Mon, 25 May 2009 08:39:07 -0700 (PDT)
Subject: unicode confusing
Message-ID: <ac50a990-d612-4ee2-931d-a07ecf98056e@37g2000yqp.googlegroups.com>

Hi,

reading content of webpage (encoded in utf-8) with urllib2, I can't
get parsed data into DB

Exception:

  File "/usr/lib/python2.5/site-packages/pyPgSQL/PgSQL.py", line 3111,
in execute
    raise OperationalError, msg
libpq.OperationalError: ERROR:  invalid UTF-8 byte sequence detected
near byte 0xe4

I've already checked several python unicode tutorials, but I have no
idea how to solve my problem.

Appreciating your help
Pet


From ptmcg at austin.rr.com  Mon May 25 12:04:10 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Mon, 25 May 2009 09:04:10 -0700 (PDT)
Subject: I need help building a data structure for a state diagram
References: <lagSl.33897$ZP4.8483@nlpi067.nbdc.sbc.com>
Message-ID: <6844f422-be3e-4c11-b4e5-f0b0a909ba12@k38g2000yqh.googlegroups.com>

On May 24, 1:16?pm, Matthew Wilson <m... at tplus1.com> wrote:
> I'm working on a really simple workflow for my bug tracker. ?I want
> filed bugs to start in an UNSTARTED status. ?From there, they can go to
> STARTED.
>

I just wrote an article for the April issue of Python Magazine on how
to add embedded DSL code to your Python scripts using Python's imputil
module, and I used a state pattern for my example.  Two state machine
examples I used to illustrate the work were a traffic light and a
library book checkin/checkout.  The traffic light state machine is
just a simple cycle through the 3 light states.  But the library book
state machine is more complex (your bug tracking example made me think
of it), with different transitions allowed one state into multiple
different states.  Here is how the code looks for these examples:

==============
# trafficLight.pystate
statemachine TrafficLight:
    Red -> Green
    Green -> Yellow
    Yellow -> Red

Red.carsCanGo    = False
Yellow.carsCanGo = True
Green.carsCanGo  = True

# ... other class definitions for state-specific behavior ...

==============
# trafficLightDemo.py

# add support for .pystate files, with
# embedded state machine DSL
import stateMachine

import trafficLight

tlight = trafficLight.Red()
while 1:
    print tlight, "GO" if tlight.carsCanGo else "STOP"
    tlight.delay()
    tlight = tlight.next_state()


==============
# libraryBook.pystate

statemachine BookCheckout:
    New       -(create)->   Available
    Available -(reserve)->  Reserved
    Available -(checkout)-> CheckedOut
    Reserved  -(cancel)->   Available
    Reserved  -(checkout)-> CheckedOut
    CheckedOut -(checkin)->  Available
    CheckedOut -(renew)->   CheckedOut


You don't need to adopt this whole DSL implementation, but the article
might give you some other ideas.

-- Paul


From paul at boddie.org.uk  Mon May 25 12:07:42 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Mon, 25 May 2009 09:07:42 -0700 (PDT)
Subject: unicode confusing
References: <ac50a990-d612-4ee2-931d-a07ecf98056e@37g2000yqp.googlegroups.com>
Message-ID: <bd608c8b-be06-46ee-ac96-011e0e8db717@c9g2000yqm.googlegroups.com>

On 25 Mai, 17:39, someone <petshm... at googlemail.com> wrote:
> Hi,
>
> reading content of webpage (encoded in utf-8) with urllib2, I can't
> get parsed data into DB
>
> Exception:
>
> ? File "/usr/lib/python2.5/site-packages/pyPgSQL/PgSQL.py", line 3111,
> in execute
> ? ? raise OperationalError, msg
> libpq.OperationalError: ERROR: ?invalid UTF-8 byte sequence detected
> near byte 0xe4
>
> I've already checked several python unicode tutorials, but I have no
> idea how to solve my problem.

With pyPgSQL, there are a few tricks that you have to take into
account:

1. With PostgreSQL, it would appear advantageous to create databases
using the "-E unicode" option.

2. When connecting, use the client_encoding and unicode_results
arguments for the connect function call:

  connection = PgSQL.connect(client_encoding="utf-8",
unicode_results=1)

3. After connecting, it appears necessary to set the client encoding
explicitly:

  connection.cursor().execute("set client_encoding to unicode")

I'd appreciate any suggestions which improve on the above, but what
this should allow you to do is to present Unicode objects to the
database and to receive such objects from queries. Whether you can
relax this and pass UTF-8-encoded strings instead of Unicode objects
is not something I can guarantee, but it's usually recommended that
you manipulate Unicode objects in your program where possible, and
here you should be able to let pyPgSQL deal with the encodings
preferred by the database.

Paul


From python.list at tim.thechases.com  Mon May 25 12:16:48 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 25 May 2009 11:16:48 -0500
Subject: formating query with empty parameter
In-Reply-To: <c7508c6f-8723-4e9d-ae32-55ce9a42404e@e21g2000yqb.googlegroups.com>
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
	<77vga0F1hgiujU1@mid.uni-berlin.de>	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>	<c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com>
	<mailman.717.1243258005.8015.python-list@python.org>
	<c7508c6f-8723-4e9d-ae32-55ce9a42404e@e21g2000yqb.googlegroups.com>
Message-ID: <4A1AC470.5080105@tim.thechases.com>

>> To stave off this problem, I often use:
>>
>>    values = [
>>     data['a'],
>>     data['b'],
>>     data['c'],
>>     data['d'],
>>     data['e'],
>>     data['f'],
>>     data['g'],
>>     ]
>>    params = ', '.join('%s' for _ in values)
>>    query = """
>>      BEGIN;
>>        INSERT INTO table
>>          (a,b,c,d,e,f,g)
>>        VALUES (%s);
>>      COMMIT;
>>      """ % params
>>    self.db.execute(query, values)
>>
> 
> Why do you pass values to execute() if you already have your query
> formatted?

The "params" might be better named "placeholders".  So after the

    query = "..." % params

the query looks like your original (go ahead and print "query" to 
see), only the number of placeholders ("%s") is guaranteed to 
match the number of values you pass in during the execute() call. 
  The second iteration I gave goes one step further to ensure 
that the "(a,b,c,d,e,f,g)" portion also matches in count to the 
number of values and place-holders to be used.

Once you have a SQL query that matches what you plan to pass 
(based on your initial data-structure:  a list/tuple or a 
dictionary), then you call execute(query, values) to have the 
database then associate the parameter-placeholders ("%s") with 
the corresponding value from "values".

-tkc




From a.cavallo at mailsnare.com  Mon May 25 12:25:09 2009
From: a.cavallo at mailsnare.com (A. Cavallo)
Date: Mon, 25 May 2009 17:25:09 +0100
Subject: Searching for pyvm
In-Reply-To: <4A19D61D.6020409@acm.org>
References: <4A19D61D.6020409@acm.org>
Message-ID: <200905251725.10172.a.cavallo@mailsnare.com>

http://students.ceid.upatras.gr/~sxanth/pyvm/

Does this help?
Regards,
Antonio

On Monday 25 May 2009 00:19:57 Vladimir G. Ivanovic wrote:
> Hello,
>
> I'm looking for the sources to pyvm, a python virtual machine
> implementation which can run Python 2.4 bytecode.
>
> If someone could point me in the right direction, I would appreciate it.
>
> Thanks.
>
> --- Vladimir
>
> P.S. The link on the author's pyvm page is broken, and I have been
> unable to find a copy elsewhere (Google, FTP servers, All-the-Web
> search, etc.)



From __peter__ at web.de  Mon May 25 12:45:26 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 25 May 2009 18:45:26 +0200
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
	<77vga0F1hgiujU1@mid.uni-berlin.de>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
	<gve463$4gr$02$1@news.t-online.com>
	<edb8840a-136a-497a-92b2-42b533020bba@m19g2000yqk.googlegroups.com>
Message-ID: <gvehuh$js1$00$1@news.t-online.com>

Pet wrote:

> On May 25, 2:50 pm, Peter Otten <__pete... at web.de> wrote:

>> cursor.execute(query, *values) # wrong
> 
> as far as I know it is not wrong, at least for pyPgSQL it takes values
> and escapes properly preventing sql injections

If so replace "# wrong" with "# superfluous" ;)

Peter



From petshmidt at googlemail.com  Mon May 25 13:17:44 2009
From: petshmidt at googlemail.com (Pet)
Date: Mon, 25 May 2009 10:17:44 -0700 (PDT)
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com> 
	<77vga0F1hgiujU1@mid.uni-berlin.de>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
	<c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com> 
	<mailman.717.1243258005.8015.python-list@python.org>
	<c7508c6f-8723-4e9d-ae32-55ce9a42404e@e21g2000yqb.googlegroups.com>
	<mailman.724.1243268217.8015.python-list@python.org>
Message-ID: <f2152a7e-eb88-4f99-b84f-b31902e2ef52@r37g2000yqd.googlegroups.com>

On 25 Mai, 18:16, Tim Chase <python.l... at tim.thechases.com> wrote:
> >> To stave off this problem, I often use:
>
> >> ? ?values = [
> >> ? ? data['a'],
> >> ? ? data['b'],
> >> ? ? data['c'],
> >> ? ? data['d'],
> >> ? ? data['e'],
> >> ? ? data['f'],
> >> ? ? data['g'],
> >> ? ? ]
> >> ? ?params = ', '.join('%s' for _ in values)
> >> ? ?query = """
> >> ? ? ?BEGIN;
> >> ? ? ? ?INSERT INTO table
> >> ? ? ? ? ?(a,b,c,d,e,f,g)
> >> ? ? ? ?VALUES (%s);
> >> ? ? ?COMMIT;
> >> ? ? ?""" % params
> >> ? ?self.db.execute(query, values)
>
> > Why do you pass values to execute() if you already have your query
> > formatted?
>
> The "params" might be better named "placeholders". ?So after the

O, thanks for clarification, I've completely missed the point of
params = ', '.join
>
> ? ? query = "..." % params
>
> the query looks like your original (go ahead and print "query" to
> see), only the number of placeholders ("%s") is guaranteed to
> match the number of values you pass in during the execute() call.
> ? The second iteration I gave goes one step further to ensure
> that the "(a,b,c,d,e,f,g)" portion also matches in count to the
> number of values and place-holders to be used.
>
> Once you have a SQL query that matches what you plan to pass
> (based on your initial data-structure: ?a list/tuple or a
> dictionary), then you call execute(query, values) to have the
> database then associate the parameter-placeholders ("%s") with
> the corresponding value from "values".
>
> -tkc



From seattlehanks at yahoo.com  Mon May 25 13:29:40 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Mon, 25 May 2009 10:29:40 -0700 (PDT)
Subject: from __future__ import absolute_import issue
References: <1aeb486c-eef8-453c-8d04-fd831a84f8e2@g22g2000pra.googlegroups.com>
	<mailman.562.1242978117.8015.python-list@python.org>
	<5d6c964f-8973-4aef-9b86-fa8b3f6855d7@f37g2000pro.googlegroups.com>
	<mailman.647.1243129181.8015.python-list@python.org>
Message-ID: <c4ff04be-5969-4236-a032-91f6411dc494@i28g2000prd.googlegroups.com>

On May 23, 6:39?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Sat, 23 May 2009 12:32:24 -0300, LittleGrasshopper ?
> <seattleha... at yahoo.com> escribi?:
>
>
>
> > On May 22, 12:42?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> > wrote:
> >> En Wed, 20 May 2009 20:18:02 -0300, LittleGrasshopper ?
> >> <seattleha... at yahoo.com> escribi?:
>
> >> > It appears that either absolute imports (or my brain) aren't working.
> >> > Given a module string.py which is in the same directory as a.py:
>
> >> > #File a.py
> >> > from __future__ importabsolute_import
> >> > import string
> >> > print string # Module imported is string.py in current directory, not
> >> > standard library module
>
> >>absolute_importhelps with imports inside a package (those are ?
> >> "relative" ?
> >> imports, relative to the package). If a module is located in a ?
> >> directory ?
> >> listed in sys.path, an absolute import will find it. I don't think ?
> >> there ?
> >> is a way to avoid shadowing a standard module (other than ensuring the ?
> >> standard directories come first in sys.path).
>
> > You are right. If you have a directory in your PYTHONPATH before the
> > standard library directories that has a string module, for example,
> >absolute_importwill not help you. I was getting confused by the fact
> > that when I print sys.path from the python shell, the first entry is
> > an empty string.
> > This empty string must denote the current directory though, because:
>
> > ['', '/usr/lib/python25.zip', '/usr/lib/python2.5', '/usr/lib/ ...]
>
> > When I have this sys.path, doing an "import string" from a module
> > where I have absolute imports enabled will still import the string
> > module in the package (which also means it is in the same directory in
> > this case.)
>
> Mmm, I don't understand this. Do you mean that the current directory is a ?
> package (that is, it contains an __init__.py file? And the main script is ?
> there? Then, from Python's POV, it is NOT a package; packages are ?
> recognized only at import time; if you execute a script that happens to be ?
> inside a package directory, Python is not aware of the "packageness" of ?
> such directory.
> In that case, all imports are absolute.
> The current directory should not be a package (at least, not a package ?
> accessible from sys.path), nasty things may happen.
>
> > So I think my string.py is being imported not because it
> > is in the same package, but because the home directory is searched
> > first.
>
> Yes.
>
> > The empty string doesn't make much sense though (at least in a
> > Unix system, you would imagine it would be something like './') but I
> > guess that synce Python is platform independent, the empty string is
> > taken to denote the current directory.
>
> Maybe you're surprised, but I don't think it's strange at all. Nobody ?
> writes open("./foo.txt") instead of open("foo.txt"), and ?
> os.path.normpath("./foo.txt") is actually "foo.txt". Having no path ?
> specification means "use the current directory" (at least in all OS that I ?
> know of, where "process' current directory" makes any sense)
>
> --
> Gabriel Genellina

Thank you for the insightful discussion, Gabriel. I was conducting
some testing with serious flaws. I think you have pointed the problem
exactly. What I was doing is: I had a directory with an __init__.py
file on it, and inside I had a test module, plus a string.py module.
My test was flawed because what I was doing is starting a python shell
from the directory in question, and then importing the test module in
the shell. I was expecting that when string was imported from within
the test module (in which I was using absolute_import) the standard
string module would be imported, but the string module in the same
package was being imported instead. The key is that it was being
imported not because it was in the same package, but because it was in
the home (current) directory. I think that explains everything, let me
know if you see any flaw in my reasoning.

And I agree with you about the current directory being denoted by an
empty string being expected. My mind was a little warped at the moment
I wrote that.


From seattlehanks at yahoo.com  Mon May 25 13:35:03 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Mon, 25 May 2009 10:35:03 -0700 (PDT)
Subject: What text editor is everyone using for Python
Message-ID: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>

With so many choices, I was wondering what editor is the one you
prefer when coding Python, and why. I normally use vi, and just got
into Python, so I am looking for suitable syntax files for it, and
extra utilities. I dabbled with emacs at some point, but couldn't get
through the key bindings for commands. I've never tried emacs with vi
keybindings (I forgot the name of it) but I've been tempted.

So what do you guys use, and why? Hopefully we can keep this civil.


From mal at egenix.com  Mon May 25 13:41:54 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Mon, 25 May 2009 19:41:54 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A107988.3020202@v.loewis.de>
References: <4A107988.3020202@v.loewis.de>
Message-ID: <4A1AD862.6090100@egenix.com>

Martin v. L?wis wrote:
> Thomas Wouters reminded me of a long-standing idea; I finally
> found the time to write it down.
> 
> Please comment!
> ...
>

Up until this PEP proposal, we had a very simple scheme for
the Python C-API: all documented functions and variables with
a "Py" prefix were part of the C-API, everything else was not
and could change between releases (in particular the private
"_Py" prefix APIs).

Changing the published APIs was considered a bad thing in the
2.x development process and generally required a good reason
to get supported.

Changing private functions or ones that were not documented
was generally never a big problem.

Now, with the PEP, I have a feeling that the Python C-API
will in effect be limited to what's in the PEP's idea of
a usable ABI and open up the non-inluded public C-APIs
to the same rate of change as the private APIs.

If that's the case, the PEP should be discussed on the C-API
list first, in order to identify a complete list of APIs that
is supposed to define the Python C-API. Ideally, all other
APIs would then need to be made private. However, I doubt that
this is possible before switching to Python 4.0.

Then again, I'm not sure whether that's what you're aiming for...

An optional cross-version ABI would certainly be a good thing.

Limiting the Python C-API would be counterproductive.

> During the compilation of applications, the preprocessor macro
> Py_LIMITED_API must be defined. Doing so will hide all definitions
> that are not part of the ABI.

So extensions wanting to use the full Python C-API as documented
in the C-API docs will still be able to do this, right ?

> Type Objects
> ------------
> 
> The structure of type objects is not available to applications;
> declaration of "static" type objects is not possible anymore
> (for applications using this ABI).

Hmm, that's going to create big problems for extensions that
want to expose a C-API for their types: Type checks are normally
done by pointer comparison using those static type objects.

> Functions and function-like Macros
> ----------------------------------
> 
> Function-like macros (in particular, field access macros) remain
> available to applications, but get replaced by function calls
> (unless their definition only refers to features of the ABI, such
> as the various _Check macros)

Including Py_INCREF()/Py_DECREF() ?

> Excluded Functions
> ------------------
> 
> Functions declared in the following header files are not part
> of the ABI:
> - cellobject.h
> - classobject.h
> - code.h
> - frameobject.h
> - funcobject.h
> - genobject.h
> - pyarena.h
> - pydebug.h
> - symtable.h
> - token.h
> - traceback.h

I don't think that's feasable: you basically remove all introspection
functions that way.

This will need a more fine-grained approach.

> Linkage
> -------
> 
> On Windows, applications shall link with python3.dll;

You mean: extensions that were compiled with Py_LIMITED_API, right ?

> an import
> library python3.lib will be available. This DLL will redirect all of
> its API functions through /export linker options to the full
> interpreter DLL, i.e. python3y.dll.

What if you mix extensions that use the full C-API with ones
that restrict themselves to the limited version ?

Would creating a Python object in a full-API extension and
free'ing it in a limited-API extension cause problems ?

> Implementation Strategy
> =======================
> 
> This PEP will be implemented in a branch, allowing users to check
> whether their modules conform to the ABI. To simplify this testing, an
> additional macro Py_LIMITED_API_WITH_TYPES will expose the existing
> type object layout, to let users postpone rewriting all types. When
> the this branch is merged into the 3.2 code base, this macro will
> be removed.

Now I'm confused again: this sounds a lot like you do want all extension
writers to only use the limited API.

[And in another post]
>> Something I haven't seen explicitly mentioned as yet (in the PEP or the
>> > python-dev list discussion) are the memory management APIs and the FILE*
>> > APIs which can cause the MSVCRT versioning issues on Windows.
>> > 
>> > Those would either need to be excluded from the stable ABI or else
>> > changed to use opaque pointers.
> 
> Good point. As a separate issue, I would actually like to deprecate,
> then remove these APIs. I had originally hoped that this would happen
> for 3.0 already, alas, nobody worked on it.
> 
> In any case, I have removed them from the ABI now.

How do you expect Python extensions to allocate memory and objects
in a platform independent way without those APIs ?

And as an aside: Which API families are you referring to ? PyMem_Malloc,
PyObject_Malloc, or PyObject_New ?

Thanks,
-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, May 25 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________
2009-06-29: EuroPython 2009, Birmingham, UK                34 days to go

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From james at agentultra.com  Mon May 25 13:44:37 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 25 May 2009 13:44:37 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <85hbz9f56i.fsf@agentultra.com>

LittleGrasshopper <seattlehanks at yahoo.com> writes:

> With so many choices, I was wondering what editor is the one you
> prefer when coding Python, and why. I normally use vi, and just got
> into Python, so I am looking for suitable syntax files for it, and
> extra utilities. I dabbled with emacs at some point, but couldn't get
> through the key bindings for commands. I've never tried emacs with vi
> keybindings (I forgot the name of it) but I've been tempted.
>
> So what do you guys use, and why? Hopefully we can keep this civil.

Google should provide you with millions of responses.


From seattlehanks at yahoo.com  Mon May 25 13:57:20 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Mon, 25 May 2009 10:57:20 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
Message-ID: <35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>

On May 25, 10:44?am, J Kenneth King <ja... at agentultra.com> wrote:
> LittleGrasshopper <seattleha... at yahoo.com> writes:
> > With so many choices, I was wondering what editor is the one you
> > prefer when coding Python, and why. I normally use vi, and just got
> > into Python, so I am looking for suitable syntax files for it, and
> > extra utilities. I dabbled with emacs at some point, but couldn't get
> > through the key bindings for commands. I've never tried emacs with vi
> > keybindings (I forgot the name of it) but I've been tempted.
>
> > So what do you guys use, and why? Hopefully we can keep this civil.
>
> Google should provide you with millions of responses.

I know Google (as a matter I read this group from Google.) I was
hoping for some new insightful responses.


From mr.spoon21 at gmail.com  Mon May 25 14:02:48 2009
From: mr.spoon21 at gmail.com (Mr.SpOOn)
Date: Mon, 25 May 2009 20:02:48 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
Message-ID: <8f67b6f80905251102o2b209de8gf05e7a27d29768f5@mail.gmail.com>

2009/5/25 LittleGrasshopper <seattlehanks at yahoo.com>:
> I know Google (as a matter I read this group from Google.) I was
> hoping for some new insightful responses.

It's just too hot to start a flame :P


From ebonak at hotmail.com  Mon May 25 14:07:24 2009
From: ebonak at hotmail.com (Esmail)
Date: Mon, 25 May 2009 14:07:24 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <gvemos$old$2@ger.gmane.org>

LittleGrasshopper wrote:
> 
> So what do you guys use, and why? Hopefully we can keep this civil.

I use Emacs, just because I have been using this editor for
all sorts of things in the last 20+ years.

I haven't been able to get the python mode to work for Windows
(do most of my work under Linux anyway), but other than that I'm
pretty happy with it :-)

HTH,
Esmail



From ryniek90 at gmail.com  Mon May 25 14:24:45 2009
From: ryniek90 at gmail.com (Ryniek90)
Date: Mon, 25 May 2009 20:24:45 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <mailman.2542.1243275133.8014.python-list@python.org>
References: <mailman.2542.1243275133.8014.python-list@python.org>
Message-ID: <4A1AE26D.4050403@gmail.com>


>
> ------------------------------------------------------------------------
>
> Temat:
> Re: What text editor is everyone using for Python
> Od:
> Esmail <ebonak at hotmail.com>
> Data:
> Mon, 25 May 2009 14:07:24 -0400
> Do:
> python-list at python.org
>
> Do:
> python-list at python.org
>
>
> LittleGrasshopper wrote:
>>
>> So what do you guys use, and why? Hopefully we can keep this civil.
>
> I use Emacs, just because I have been using this editor for
> all sorts of things in the last 20+ years.
>
> I haven't been able to get the python mode to work for Windows
> (do most of my work under Linux anyway), but other than that I'm
> pretty happy with it :-)
>
> HTH,
> Esmail
>
>

I'm using Geany (sort of small IDE) and I'm glad using it. But for big 
projects, NetBeans or Eclipse are better. There are also Komodo EDIT or 
Stani's Python Editor. Of course if someone like GUI editors/IDE's. 
Otherwise, use Vi/Emacs. Like someone previously said, search the Google.


From celoserpa at gmail.com  Mon May 25 14:28:20 2009
From: celoserpa at gmail.com (Marcelo de Moraes Serpa)
Date: Mon, 25 May 2009 13:28:20 -0500
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1AE26D.4050403@gmail.com>
References: <mailman.2542.1243275133.8014.python-list@python.org>
	<4A1AE26D.4050403@gmail.com>
Message-ID: <1e5bcefd0905251128h674615a5m45d79385d9ac0c2c@mail.gmail.com>

emacs is a swiss-knife, good for small, medium, big or huge projects, or
single files

On Mon, May 25, 2009 at 1:24 PM, Ryniek90 <ryniek90 at gmail.com> wrote:

>
>
>> ------------------------------------------------------------------------
>>
>> Temat:
>> Re: What text editor is everyone using for Python
>> Od:
>> Esmail <ebonak at hotmail.com>
>> Data:
>> Mon, 25 May 2009 14:07:24 -0400
>> Do:
>> python-list at python.org
>>
>> Do:
>> python-list at python.org
>>
>>
>> LittleGrasshopper wrote:
>>
>>>
>>> So what do you guys use, and why? Hopefully we can keep this civil.
>>>
>>
>> I use Emacs, just because I have been using this editor for
>> all sorts of things in the last 20+ years.
>>
>> I haven't been able to get the python mode to work for Windows
>> (do most of my work under Linux anyway), but other than that I'm
>> pretty happy with it :-)
>>
>> HTH,
>> Esmail
>>
>>
>>
> I'm using Geany (sort of small IDE) and I'm glad using it. But for big
> projects, NetBeans or Eclipse are better. There are also Komodo EDIT or
> Stani's Python Editor. Of course if someone like GUI editors/IDE's.
> Otherwise, use Vi/Emacs. Like someone previously said, search the Google.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From nospam at nospam.com  Mon May 25 14:49:50 2009
From: nospam at nospam.com (Gilles Ganault)
Date: Mon, 25 May 2009 20:49:50 +0200
Subject: Are Python-based web frameworks reliable enough?
Message-ID: <7opl151anck3qve09uu88t67khgbd9ob1t@4ax.com>

Hello

	Until now, the modest web apps I wrote were all in PHP because it's
available on just about any hosted server.

I now have a couple of ideas for applications where I would deploy my
own servers, so that I'd rather write them in Python because I find
the language more pleasant to write with.

I read that the traction for the mod_python module isn't as strong as
mod_php, so I guess I should consider the alternative, which is
writing a long-running process with some framework like TurboGears or
Django.

To make an informed choice, I'd like your feedback on this:

1. Is mod_python a bad choice today? If yes, are there other PHP-like
modules available, ie. the Python code is hosted in pages that are
loaded every time a user calls them?

2. If you think I should consider long-running processes, are the
frameworks reliable enough so that I shouldn't fear crashes every so
often?

3. What about performance as compared to equivalent PHP/MySQL apps?

Thank  you for any feedback.


From hackingkk at gmail.com  Mon May 25 15:41:38 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Tue, 26 May 2009 01:11:38 +0530
Subject: Are Python-based web frameworks reliable enough?
In-Reply-To: <7opl151anck3qve09uu88t67khgbd9ob1t@4ax.com>
References: <7opl151anck3qve09uu88t67khgbd9ob1t@4ax.com>
Message-ID: <1243280498.5645.15.camel@kk-laptop>

On Mon, 2009-05-25 at 20:49 +0200, Gilles Ganault wrote:
> Hello
> 
> 	Until now, the modest web apps I wrote were all in PHP because it's
> available on just about any hosted server.
> 
> I now have a couple of ideas for applications where I would deploy my
> own servers, so that I'd rather write them in Python because I find
> the language more pleasant to write with.
> Certainly, You will be much much more productive if you use python provided you are not going to do it the old "cgi " way.

> I read that the traction for the mod_python module isn't as strong as
> mod_php, so I guess I should consider the alternative, which is
> writing a long-running process with some framework like TurboGears or
> Django.
> 
Why not give a try to pylons?  While turbogears is great and very
powerful, it any ways uses most of pylons and pylons is not just rock
solid and robust, it also has very very good documentation.
Not to mention the fact that heavy production applications are today
running pylons.

> To make an informed choice, I'd like your feedback on this:
> 
> 1. Is mod_python a bad choice today? If yes, are there other PHP-like
> modules available, ie. the Python code is hosted in pages that are
> loaded every time a user calls them?
> Even if it was a good choice, cgi method of programming is no more suitable in today's www, because the requirements of a web developer today are much beyond just oepning a connection to a database and sending some processed response in plain old html.
Today's web applications do much more than that so a web framework is
almost always a better choice.

>   
> 2. If you think I should consider long-running processes, are the
> frameworks reliable enough so that I shouldn't fear crashes every so
> often?
> 
No not really, although it is always a better idea to run your
production web app behind apache.  This will keep the server up on very
heavy loads and you will not have to worry about http requests and
responses.  let that be taken care by the best tool (apache ) and let
your application handle how to manage the logic and send out views.

> 3. What about performance as compared to equivalent PHP/MySQL apps?
> 
Performance is very good if you use the right tool in the right place.
This is the biggest advantage of some web frameworks like pylons or tg
over other.
happy hacking.
Krishnakant.





From pythoncurious at gmail.com  Mon May 25 16:00:00 2009
From: pythoncurious at gmail.com (pythoncurious at gmail.com)
Date: Mon, 25 May 2009 13:00:00 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org> 
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com> 
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com> 
	<mailman.681.1243202929.8015.python-list@python.org>
Message-ID: <6cf0f5dc-e9c6-4cf6-b6f7-d8f3814222da@n21g2000vba.googlegroups.com>

On May 25, 12:08?am, Dave Angel <da... at ieee.org> wrote:

>
> Is Clearcase still around? ?I hope it works better than it did in 1992.
>

I don't know how it worked back then, but if it's worse than today, I
don't know how they ever managed to get people to use it. I'm not a
fan and I don't have a choice about using it :)

> Somebody else has already pointed out that you can tell Python not to
> create thosefiles(during your development stages).
>

Yes, that's probably the best way to sort out the problems.
It would of course be nice if python could detect that these files
aren't usable and just regenerate them. I realise it might not be a
trivial feature to implement though.
>
> Perhaps Clearcase supports some form of "exclusion" parameter, wherein
> you say not to do version control onfileswith certain patterns, like .pyc

They're not actually version controlled, but "view private" as someone
described. This means I'll see them whenever I'm using the view they
were created in.



From gd_spam at spamfence.net  Mon May 25 16:03:36 2009
From: gd_spam at spamfence.net (=?UTF-8?Q?G=C3=BCnther?= Dietrich)
Date: Mon, 25 May 2009 22:03:36 +0200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <o5are6-5ep.ln1@spamfence.net>

LittleGrasshopper <seattlehanks at yahoo.com> wrote:

>With so many choices, I was wondering what editor is the one you
>prefer when coding Python, and why.

[...]

>So what do you guys use, and why? Hopefully we can keep this civil.

I found 'EasyEclipse for Python' soon after I began using Python. With 
PyDev, it even contains a Python debugger.
After adding a Mercurial plug-in, it has all I need for Python 
programming.
One disadvantage of EasyEclipse is, that they mangled the install/update 
system, so that it is very difficult to find the original Eclipse 
plug-ins/features.

So, in between, I replaced EasyEclipse by Eclipse, with all the plug-ins 
that came bundled with 'EasyEclipse for Python' installed by hand, but 
more actual versions.
In my opinion, it is a very convenient system for Python development, 
especially due to the debugger.
If you don't use the free PyDev, but the commercial one, you even get a 
debugger for remote debugging. Useful e.g. for debugging of blender 
scripts.



Best regards,

G?nther


From pythoncurious at gmail.com  Mon May 25 16:04:18 2009
From: pythoncurious at gmail.com (pythoncurious at gmail.com)
Date: Mon, 25 May 2009 13:04:18 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org> 
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com> 
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com> 
	<73631ab6-ab2a-4b21-928c-f7690d6e8e00@j18g2000prm.googlegroups.com>
Message-ID: <0527679c-5b3a-4919-b044-9ae8ba97d802@z5g2000yqn.googlegroups.com>

On May 25, 12:07?am, John Machin <sjmac... at lexicon.net> wrote:

> "switching" scarcely seems to be the right description. You appear to
> be running the same code from one repository simultaneously available
> to two different platforms.
>
> Try this: Instead of running your code straight from your repository,
> set up a run-time "launch pad" in an appropriate place for each
> platform. When there is a new release of your app, install it in each
> launchpad.

For releases, that's a good enough idea. But while developing and
wanting to run units tests, it's sort of a big overhead. Especially
since I tend to run the unit test quite frequently.

>
> I'm a bit lost here ... your clearcase repository uses a mysterious
> "some sort of network file system" to which you have access
> permissions which allow you to delete individualfiles??

Apparently I don't explain things well. :)
Others have explained it better in this thread or you can have a look
at http://en.wikipedia.org/wiki/Rational_ClearCase.


From roy at panix.com  Mon May 25 16:28:33 2009
From: roy at panix.com (Roy Smith)
Date: Mon, 25 May 2009 16:28:33 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <roy-6050D4.16283325052009@news.panix.com>

LittleGrasshopper <seattlehanks at yahoo.com> wrote:

> I normally use vi
> [...]
> I dabbled with emacs at some point
> [...]
> So what do you guys use, and why? Hopefully we can keep this civil.

I'm confused.  You put emacs and vi in the same paragraph and then expect 
the conversation to remain civil? :-)


From mmanns at gmx.net  Mon May 25 17:22:51 2009
From: mmanns at gmx.net (mmanns at gmx.net)
Date: Mon, 25 May 2009 23:22:51 +0200
Subject: Determining 32 bit vs 64 bit Python and numpy
Message-ID: <20090525232251.179d9152@gmx.net>

Hi

I am looking for a robust, cross-platform way to determine if I am on a
32 bit or a 64 bit Python and if the numpy installation is also 32 bit
or 64 bit.

I have googled a bit and found some platform specific solutions but
nothing general.

The solution should work with different versions of Python (>= 2.4).

Thanks in advance

Martin


From martin at v.loewis.de  Mon May 25 17:54:45 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Mon, 25 May 2009 23:54:45 +0200
Subject: Determining 32 bit vs 64 bit Python and numpy
In-Reply-To: <20090525232251.179d9152@gmx.net>
References: <20090525232251.179d9152@gmx.net>
Message-ID: <4a1b13a5$0$20453$9b622d9e@news.freenet.de>

> I am looking for a robust, cross-platform way to determine if I am on a
> 32 bit or a 64 bit Python and if the numpy installation is also 32 bit
> or 64 bit.

You can find out the size of a pointer with struct.calcsize("P") * 8.
Numpy will have the same configuration if you can import it.

Regards,
Martin


From mmanns at gmx.net  Mon May 25 18:07:56 2009
From: mmanns at gmx.net (mmanns at gmx.net)
Date: Tue, 26 May 2009 00:07:56 +0200
Subject: Determining 32 bit vs 64 bit Python and numpy
References: <20090525232251.179d9152@gmx.net>
	<4a1b13a5$0$20453$9b622d9e@news.freenet.de>
Message-ID: <20090526000756.4a5b4176@gmx.net>

On Mon, 25 May 2009 23:54:45 +0200
"Martin v. L?wis" <martin at v.loewis.de> wrote:

> > I am looking for a robust, cross-platform way to determine if I am
> > on a 32 bit or a 64 bit Python and if the numpy installation is
> > also 32 bit or 64 bit.
> 
> You can find out the size of a pointer with struct.calcsize("P") * 8.
> Numpy will have the same configuration if you can import it.


That works great. Thank you.

Best Regards

Martin



From ebonak at hotmail.com  Mon May 25 19:23:03 2009
From: ebonak at hotmail.com (Esmail)
Date: Mon, 25 May 2009 19:23:03 -0400
Subject: Optimizing math functions
In-Reply-To: <loom.20090525T082837-787@post.gmane.org>
References: <mailman.619.1243084999.8015.python-list@python.org>	<0033dace$0$9725$c3e8da3@news.astraweb.com>	<loom.20090524T083337-764@post.gmane.org>	<4A193DD5.4090401@hotmail.com>
	<loom.20090525T082837-787@post.gmane.org>
Message-ID: <gvf98o$omp$1@ger.gmane.org>

Charlie wrote:
> 
> It might work under Linux, however, it was developed under Windows and, to my
> knowledge, has never been tested on a Linux machine.  Basic operation only
> depends on installations of matplotlib, numpy, and scipy.  Those packages are
> all available on Linux.
> 
> If you try it, I'd like to know the outcome.

For sure, if I end up trying it I will post a message about my
results.

> The parasol options to launch Microsoft Office apps Excel, Power Point, and
> Word; or the ray tracing app POV-Ray, will very likely fail.

:-)

thanks again for the information about Parasol,

Esmail




From sjmachin at lexicon.net  Mon May 25 19:52:11 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 25 May 2009 16:52:11 -0700 (PDT)
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org> 
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com> 
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com> 
	<73631ab6-ab2a-4b21-928c-f7690d6e8e00@j18g2000prm.googlegroups.com> 
	<0527679c-5b3a-4919-b044-9ae8ba97d802@z5g2000yqn.googlegroups.com>
Message-ID: <fe99d404-bb81-453e-afb9-b2d78569b94d@v23g2000pro.googlegroups.com>

On May 26, 6:04?am, pythoncuri... at gmail.com wrote:
> On May 25, 12:07?am, John Machin <sjmac... at lexicon.net> wrote:
>
> > "switching" scarcely seems to be the right description. You appear to
> > be running the same code from one repository simultaneously available
> > to two different platforms.
>
> > Try this: Instead of running your code straight from your repository,
> > set up a run-time "launch pad" in an appropriate place for each
> > platform. When there is a new release of your app, install it in each
> > launchpad.
>
> For releases, that's a good enough idea. But while developing and
> wanting to run units tests, it's sort of a big overhead. Especially
> since I tend to run the unit test quite frequently.

Oh .. so there's no concept of copying only the changed files??



From db3l.net at gmail.com  Mon May 25 20:56:02 2009
From: db3l.net at gmail.com (David Bolen)
Date: Mon, 25 May 2009 20:56:02 -0400
Subject: A fast way to read last line of gzip archive ?
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
	<m2y6smm7lw.fsf@valheru.db3l.homeip.net>
	<mailman.696.1243233822.8015.python-list@python.org>
Message-ID: <m2tz38n0m5.fsf@valheru.db3l.homeip.net>

"Barak, Ron" <Ron.Barak at lsi.com> writes:

> I couldn't really go with the shell utilities approach, as I have no
> say in my user environment, and thus cannot assume which binaries
> are install on the user's machine.

I suppose if you knew your target you could just supply the external
binaries to go with your application, but I agree that would probably
be more of a pain than its worth for the performance gain in real
world time.

> I'll try and implement your last suggestion, and see if the
> performance is acceptable to (human) users.

In terms of tuning the third option a bit, I'd play with the tracking
of the final two chunk (as mentioned in my first response), perhaps
shrinking the chunk size or only processing a smaller chunk of it for
lines (assuming a reasonable line size) to minimize the final loop.
You could also try using splitlines() on the final buffer rather than
a StringIO wrapper, although that'll have a memory hit for the
constructed list but doing a small portion of the buffer would
minimize that.

I was curious what I could actually achieve, so here are three variants
that I came up with.

First, this just fine tunes slightly tracking the chunks and then only
processes enough final data based on anticipated maximum length length
(so if the final line is longer than that you'll only get the final
MAX_LINE bytes of that line).  I also found I got better performance
using a smaller 1024 chunk size with GZipFile.read() than a MB - not
entirely sure why although it perhaps matches the internal buffer size
better:

    # last-chunk-2.py

    import gzip
    import sys

    CHUNK_SIZE = 1024
    MAX_LINE = 255

    in_file = gzip.open(sys.argv[1],'r')

    chunk = prior_chunk = ''
    while 1:
        prior_chunk = chunk
        # Note that CHUNK_SIZE here is in terms of decompressed data
        chunk = in_file.read(CHUNK_SIZE)
        if len(chunk) < CHUNK_SIZE:
            break

    if len(chunk) < MAX_LINE:
        chunk = prior_chunk + chunk

    line = chunk.splitlines(True)[-1]
    print 'Last:', line


On the same test set as my last post, this reduced the last-chunk
timing from about 2.7s to about 2.3s.

Now, if you're willing to play a little looser with the gzip module,
you can gain quite a bit more.  If you directly call the internal _read()
method you can bypass some of the unnecessary processing read() does, and
go back to larger I/O chunks:

    # last-gzip.py

    import gzip
    import sys

    CHUNK_SIZE = 1024*1024
    MAX_LINE = 255

    in_file = gzip.open(sys.argv[1],'r')

    chunk = prior_chunk = ''
    while 1:
        try:
            # Note that CHUNK_SIZE here is raw data size, not decompressed
            in_file._read(CHUNK_SIZE)
        except EOFError:
            if in_file.extrasize < MAX_LINE:
                chunk = chunk + in_file.extrabuf
            else:
                chunk = in_file.extrabuf
            break

        chunk = in_file.extrabuf
        in_file.extrabuf = ''
        in_file.extrasize = 0

    line = chunk[-MAX_LINE:].splitlines(True)[-1]
    print 'Last:', line

Note that in this case since I was able to bump up CHUNK_SIZE, I take
a slice to limit the work splitlines() has to do and the size of the
resulting list.  Using the larger CHUNK_SIZE (and it being raw size) will
use more memory, so could be tuned down if necessary.

Of course, the risk here is that you are dependent on the _read()
method, and the internal use of the extrabuf/extrasize attributes,
which is where _read() places the decompressed data.  In looking back
I'm pretty sure this code is safe at least for Python 2.4 through 3.0,
but you'd have to accept some risk in the future.

This approach got me down to 1.48s.

Then, just for the fun of it, once you're playing a little looser with
the gzip module, it's also doing work to compute the crc of the
original data for comparison with the decompressed data.  If you don't
mind so much about that (depends on what you're using the line for)
you can just do your own raw decompression with the zlib module, as in
the following code, although I still start with a GzipFile() object to
avoid having to rewrite the header processing:

    # last-decompress.py

    import gzip
    import sys
    import zlib

    CHUNK_SIZE = 1024*1024
    MAX_LINE = 255

    decompress = zlib.decompressobj(-zlib.MAX_WBITS)

    in_file = gzip.open(sys.argv[1],'r')
    in_file._read_gzip_header()

    chunk = prior_chunk = ''
    while 1:
        buf = in_file.fileobj.read(CHUNK_SIZE)
        if not buf:
            break
        d_buf = decompress.decompress(buf)
        # We might not have been at EOF in the read() but still have no
        # decompressed data if the only remaining data was not original data
        if d_buf:
            prior_chunk = chunk
            chunk = d_buf

    if len(chunk) < MAX_LINE:
        chunk = prior_chunk + chunk

    line = chunk[-MAX_LINE:].splitlines(True)[-1]
    print 'Last:', line

This version got me down to 1.15s.

So in summary, the choices when tested on my system ended up at:

    last             26
    last-chunk        2.7
    last-chunk-2      2.3
    last-popen        1.7
    last-gzip         1.48
    last-decompress   1.12

So by being willing to mix in some more direct code with the GzipFile
object, I was able to beat the overhead of shelling out to the faster
utilities, while remaining in pure Python.

-- David


From gallium.arsenide at gmail.com  Mon May 25 22:20:41 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Mon, 25 May 2009 19:20:41 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<roy-6050D4.16283325052009@news.panix.com>
Message-ID: <3227f485-7a1b-45c6-a6ad-c699473aa7e2@z7g2000vbh.googlegroups.com>

On May 25, 4:28?pm, Roy Smith <r... at panix.com> wrote:
>
> I'm confused. ?You put emacs and vi in the same paragraph
> and then expect the conversation to remain civil? :-)

I know!  He is really asking a lot!

Ultimately, I think if you are comfortable with vi, stick with vi.
There are plenty of people who are using Python-specific
configurations of vi to good effect.

Personally, I like SciTE.  Very small, very fast text editor based on
the Scintilla editor component.  It doesn't autoindent Python
perfectly out of the box, but I wrote a patch for myself (which I'm
happy to share with anyone who's interested).

I also have dabbled with Geany, which someone mentioned earlier.  I
already don't use all the features of SciTE, so I'm nowhere near
needing Geany's capabilities, but what I have seen of it I like, so I
am comfortable recommending it.  It also is very actively maintained
and supported, if that makes a difference.

John


From thushianthan15 at gmail.com  Mon May 25 23:05:13 2009
From: thushianthan15 at gmail.com (thushianthan15 at gmail.com)
Date: Mon, 25 May 2009 20:05:13 -0700 (PDT)
Subject: Network programming ?
Message-ID: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>


Hi everyone,

I am planning to develop a chatting software in Python, for my college
project. I am using Windows Vista. Is it possible to do sockets
programming in Python ? Any books or websites ?  Also, i want to
develop a gui for that program. What are the gui tool kits available
for windows? I already knew about PyGtk and PyQT, but will they work
properly in Windows platform? Any suggestions?

Thank you. Excuse my English.


From ralf at schoenian-online.de  Mon May 25 23:33:25 2009
From: ralf at schoenian-online.de (Ralf Schoenian)
Date: Tue, 26 May 2009 05:33:25 +0200
Subject: Network programming ?
In-Reply-To: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
Message-ID: <4a1b61b4$0$32664$9b4e6d93@newsspool2.arcor-online.net>

thushianthan15 at gmail.com wrote:
> Hi everyone,
> 
> I am planning to develop a chatting software in Python, for my college
> project. I am using Windows Vista. Is it possible to do sockets
> programming in Python ? Any books or websites ?  Also, i want to
> develop a gui for that program. What are the gui tool kits available
> for windows? I already knew about PyGtk and PyQT, but will they work
> properly in Windows platform? Any suggestions?
> 
> Thank you. Excuse my English.

You forgot to mention the other big gui toolkits tkinter and wxPython. 
Years ago, I decided for wxPython because of its licence and that it is 
useable at windows and linux. For the socket programming I would like to 
suggest using the xmlrpclib. You can find the official documentation 
here: http://docs.python.org/library/xmlrpclib.html

Regards,
Ralf Schoenian


From lepto.python at gmail.com  Tue May 26 00:47:29 2009
From: lepto.python at gmail.com (oyster)
Date: Tue, 26 May 2009 12:47:29 +0800
Subject: any lib to extract pages form pdf and then merge?
Message-ID: <6a4f17690905252147m4cb23f41s8647c37562259021@mail.gmail.com>

I want to extract some pages from vary pdf files, then write them
with/witout rotation into one new pdf file. something likes this
[py]
import gfx
doc = gfx.open("pdf", r"Theory.pdf")
pdf = gfx.PDF()
for pagenr in [1,5,7]:
    page = doc.getPage(pagenr)

    if pagenr==1:
        page.rotate(90)                                         #for some pages

    pdf.startpage(page.width, page.height)
    page.render(pdf)
    pdf.endpage()
pdf.save("new pdf.pdf")
[/py]

I have tried pypdf, but it errs and exits on some of my pdfs(no, the
files have no password)

can someone suggest on such a lib for python on windows/or a pure C-dll?
(I mean pdf page->pdf, not pdf page->pic->pdf)

thanx


From steven at REMOVE.THIS.cybersource.com.au  Tue May 26 01:01:14 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 26 May 2009 05:01:14 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <pan.2009.05.26.05.01.13@REMOVE.THIS.cybersource.com.au>

On Mon, 25 May 2009 10:35:03 -0700, LittleGrasshopper wrote:

> With so many choices, I was wondering what editor is the one you prefer
> when coding Python, and why.

I use kwrite when on a GUI. When I can't avoid editing files remotely 
over ssh, I use nano.

Why? I dislike Gnome's user-interface, and I find gedit slightly too 
underpowered and dumbed down for my taste. (Although it has a couple of 
nice features.) Of the KDE editors, kedit is too basic and I've never got 
into kate, although perhaps I should. kwrite has a nice clean, consistent 
UI that matches other KDE apps, instead of being hideously ugly like some 
apps I won't mention.

As for nano, I dislike having to memorize obscure ctrl-alt-shift key 
combos to do the simplest thing. For a handful of small edits, nano is 
perfectly adequate, doesn't tax my memory, and does the job.



-- 
Steven


From debatem1 at gmail.com  Tue May 26 01:39:20 2009
From: debatem1 at gmail.com (CTO)
Date: Mon, 25 May 2009 22:39:20 -0700 (PDT)
Subject: any lib to extract pages form pdf and then merge?
References: <mailman.735.1243313253.8015.python-list@python.org>
Message-ID: <a93f97db-c5f6-43b6-95a0-cbb7ee4d5aa4@p4g2000vba.googlegroups.com>

On May 26, 12:47?am, oyster <lepto.pyt... at gmail.com> wrote:
> I want to extract some pages from vary pdf files, then write them
> with/witout rotation into one new pdf file. something likes this
> [py]
> import gfx
> doc = gfx.open("pdf", r"Theory.pdf")
> pdf = gfx.PDF()
> for pagenr in [1,5,7]:
> ? ? page = doc.getPage(pagenr)
>
> ? ? if pagenr==1:
> ? ? ? ? page.rotate(90) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? #for some pages
>
> ? ? pdf.startpage(page.width, page.height)
> ? ? page.render(pdf)
> ? ? pdf.endpage()
> pdf.save("new pdf.pdf")
> [/py]
>
> I have tried pypdf, but it errs and exits on some of my pdfs(no, the
> files have no password)
>
> can someone suggest on such a lib for python on windows/or a pure C-dll?
> (I mean pdf page->pdf, not pdf page->pic->pdf)
>
> thanx

I'd recommend reportlab <URL: http://www.reportlab.org/>. It is mostly
geared towards creating new PDFs, but it is pretty much best-of-breed
AFAICT.

Geremy Condra


From Scott.Daniels at Acm.Org  Tue May 26 02:10:02 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 25 May 2009 23:10:02 -0700
Subject: 4 hundred quadrillonth?
In-Reply-To: <pan.2009.05.25.05.22.14@REMOVE.THIS.cybersource.com.au>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>	<mailman.535.1242945935.8015.python-list@python.org>	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>	<gvb8kn$7gm$2@lust.ihug.co.nz>	<mailman.674.1243192904.8015.python-list@python.org>	<gvd6c0$bqs$1@lust.ihug.co.nz>
	<pan.2009.05.25.05.22.14@REMOVE.THIS.cybersource.com.au>
Message-ID: <FoidnSoDAqr_G4bXnZ2dnUVZ_gSdnZ2d@pdx.net>

Steven D'Aprano wrote:
> On Mon, 25 May 2009 16:21:19 +1200, Lawrence D'Oliveiro wrote:
>... (0) "Opposite" is not well-defined unless you have a dichotomy. In the 
>... (1/3) Why do you jump to the conclusion that "pi=3" implies that only 
>... (1/2) If you "get rid of real numbers", then obviously you must have a 
>... (2/3) There is *no* point (2/3).
>... (1) I thought about numbering my points as consecutive increasing
> integers, but decided that was an awfully boring convention. A shiny 
> banananana for the first person to recognise the sequence.

I'd call it F_3, but using a Germanic F (Farey sequence limit 3).

Do I get a banana or one with a few more ans?

--Scott David Daniels
Scott.Daniels at Acm.Org


From wuwei23 at gmail.com  Tue May 26 02:23:40 2009
From: wuwei23 at gmail.com (alex23)
Date: Mon, 25 May 2009 23:23:40 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<pan.2009.05.26.05.01.13@REMOVE.THIS.cybersource.com.au>
Message-ID: <127e2b7a-4683-4072-ba0a-ebeacf24f270@f37g2000pro.googlegroups.com>

On May 26, 3:01?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> I dislike Gnome's user-interface, and I find gedit slightly too
> underpowered and dumbed down for my taste. (Although it has a couple of
> nice features.)

Gedit is also nicely extensible: http://www.instructables.com/id/Using-Gedit-as-a-Python-IDE/

Not that I'm trying to change your editor, preferences are just
that :) (I tend to alternate between gvim, SPE and Komodo Edit...)


From ldo at geek-central.gen.new_zealand  Tue May 26 02:31:56 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 26 May 2009 18:31:56 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <gvg2cs$1a0$2@lust.ihug.co.nz>

In message <d6d05d39-98e7-4c28-
b201-4b2445732ab4 at v35g2000pro.googlegroups.com>, LittleGrasshopper wrote:

> ... I am looking for suitable syntax files for [editor of choice] ...

I don't understand why people need "syntax files" to use a text editor.



From steven at REMOVE.THIS.cybersource.com.au  Tue May 26 02:39:42 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 26 May 2009 06:39:42 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
Message-ID: <pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>

On Tue, 26 May 2009 18:31:56 +1200, Lawrence D'Oliveiro wrote:

> In message <d6d05d39-98e7-4c28-
> b201-4b2445732ab4 at v35g2000pro.googlegroups.com>, LittleGrasshopper
> wrote:
> 
>> ... I am looking for suitable syntax files for [editor of choice] ...
> 
> I don't understand why people need "syntax files" to use a text editor.

Do you want syntax highlighting?

If so, then your editor needs to either have an external config file 
describing the syntax you want highlighted, or a built-in internal config 
to do the same thing. For various reasons, it's better to have such 
config as an external file rather than compiled into the editor.

If you've never used syntax highlighting, then you don't know what you're 
missing. I can do without it, but it's a bother.



-- 
Steven


From martin at v.loewis.de  Tue May 26 02:59:51 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 26 May 2009 08:59:51 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A1AD862.6090100@egenix.com>
References: <4A107988.3020202@v.loewis.de> <4A1AD862.6090100@egenix.com>
Message-ID: <4A1B9367.7090808@v.loewis.de>

> Now, with the PEP, I have a feeling that the Python C-API
> will in effect be limited to what's in the PEP's idea of
> a usable ABI and open up the non-inluded public C-APIs
> to the same rate of change as the private APIs.

That's certainly not the plan. Instead, the plan is to have
a stable ABI. The policy on the API isn't affected, except
for restricting changes to the API that would break the ABI.

>> During the compilation of applications, the preprocessor macro
>> Py_LIMITED_API must be defined. Doing so will hide all definitions
>> that are not part of the ABI.
> 
> So extensions wanting to use the full Python C-API as documented
> in the C-API docs will still be able to do this, right ?

Correct. They would link to the version-specific DLL on Windows.

>> The structure of type objects is not available to applications;
>> declaration of "static" type objects is not possible anymore
>> (for applications using this ABI).
> 
> Hmm, that's going to create big problems for extensions that
> want to expose a C-API for their types: Type checks are normally
> done by pointer comparison using those static type objects.

I don't see the problem. During module initialization, you
create the type object and store it in a global variable, and
then both clients and the module compare against the stored
pointer.

>> Function-like macros (in particular, field access macros) remain
>> available to applications, but get replaced by function calls
>> (unless their definition only refers to features of the ABI, such
>> as the various _Check macros)
> 
> Including Py_INCREF()/Py_DECREF() ?

Yes, although some people are requesting that these become functions.

>> Excluded Functions
>> ------------------
>>
>> Functions declared in the following header files are not part
>> of the ABI:
>> - cellobject.h
>> - classobject.h
>> - code.h
>> - frameobject.h
>> - funcobject.h
>> - genobject.h
>> - pyarena.h
>> - pydebug.h
>> - symtable.h
>> - token.h
>> - traceback.h
> 
> I don't think that's feasable: you basically remove all introspection
> functions that way.
> 
> This will need a more fine-grained approach.

What specifically is it that you want to do in a module that you
couldn't do anymore?

>> On Windows, applications shall link with python3.dll;
> 
> You mean: extensions that were compiled with Py_LIMITED_API, right ?

Correct, see "Terminology" in the PEP.

> 
>> an import
>> library python3.lib will be available. This DLL will redirect all of
>> its API functions through /export linker options to the full
>> interpreter DLL, i.e. python3y.dll.
> 
> What if you mix extensions that use the full C-API with ones
> that restrict themselves to the limited version ?

Some link against python3.dll, others against python32.dll (say).

> Would creating a Python object in a full-API extension and
> free'ing it in a limited-API extension cause problems ?

No problem that I can see.

>> This PEP will be implemented in a branch, allowing users to check
>> whether their modules conform to the ABI. To simplify this testing, an
>> additional macro Py_LIMITED_API_WITH_TYPES will expose the existing
>> type object layout, to let users postpone rewriting all types. When
>> the this branch is merged into the 3.2 code base, this macro will
>> be removed.
> 
> Now I'm confused again: this sounds a lot like you do want all extension
> writers to only use the limited API.

I certainly want to support as many modules as reasonable with the PEP.
Whether or not developers then chose to build version-independent
binaries is certainly outside the scope of the PEP - it only specifies
action items for Python, not for application authors.

>>> Something I haven't seen explicitly mentioned as yet (in the PEP or the
>>>> python-dev list discussion) are the memory management APIs and the FILE*
>>>> APIs which can cause the MSVCRT versioning issues on Windows.
>>>>
>>>> Those would either need to be excluded from the stable ABI or else
>>>> changed to use opaque pointers.
>> Good point. As a separate issue, I would actually like to deprecate,
>> then remove these APIs. I had originally hoped that this would happen
>> for 3.0 already, alas, nobody worked on it.
>>
>> In any case, I have removed them from the ABI now.
> 
> How do you expect Python extensions to allocate memory and objects
> in a platform independent way without those APIs ?

I have only removed functions from the ABI that have FILE* in their
signatures.

> And as an aside: Which API families are you referring to ? PyMem_Malloc,
> PyObject_Malloc, or PyObject_New ?

Neither. PyRun_AnyFileFlags and friends.

Regards,
Martin


From gagsl-py2 at yahoo.com.ar  Tue May 26 03:19:14 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 26 May 2009 04:19:14 -0300
Subject: exec statement with/without prior compile...
References: <97a8f1a70905250707m413e428ei63494285248d0afa@mail.gmail.com>
Message-ID: <op.uuizvjgqx6zn5v@gabriel.sleipnir-bsas>

En Mon, 25 May 2009 11:07:13 -0300, Jaime Fernandez del Rio
<jaime.frio at gmail.com> escribi?:

> These weekend I've been tearing down to pieces Michele Simionato's
> decorator module, that builds signature preserving decorators. At the
> heart of it all there is a dynamically generated function, which works
> something similar to this...
>
> ...
>     src = """def function(a,b,c) :\n    return _caller_(a,b,c)\n"""
>     evaldict = {'_caller_' : _caller_}
>     code = compile(src, '<string>', 'single')
>     exec code in evaldict
>     new_func = evaldict[function]
> ...
>
> I have found fooling around with this code, that the compile step can
> be completely avoided and go for a single:
>
>     exec src in evaldict
>
> Now, I'm sure there is a good reason for that additional step, but I
> haven't been able to find what the difference between both approaches
> is.

The only reason I can think of, is restricting src to be a single
statement only (due to the compile flag used).

> And since I'm asking, could something similar, i.e. defining a new
> function and get a handle to it, be achieved with eval?

No, because def is a statement, and eval only accepts an expression.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue May 26 03:20:11 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 26 May 2009 04:20:11 -0300
Subject: how to get rid of pyc files ?
References: <mailman.658.1243170106.8015.python-list@python.org>
	<f7ac535b-cdde-42de-83be-1e5081ff5c2d@w31g2000prd.googlegroups.com>
	<26252295-7cd9-4c36-a966-c63b5250be8f@j18g2000yql.googlegroups.com>
	<mailman.681.1243202929.8015.python-list@python.org>
	<6cf0f5dc-e9c6-4cf6-b6f7-d8f3814222da@n21g2000vba.googlegroups.com>
Message-ID: <op.uuixybghx6zn5v@gabriel.sleipnir-bsas>

En Mon, 25 May 2009 17:00:00 -0300, <pythoncurious at gmail.com> escribi?:
> On May 25, 12:08?am, Dave Angel <da... at ieee.org> wrote:
>
>> Somebody else has already pointed out that you can tell Python not to
>> create thosefiles(during your development stages).
>
> Yes, that's probably the best way to sort out the problems.
> It would of course be nice if python could detect that these files
> aren't usable and just regenerate them. I realise it might not be a
> trivial feature to implement though.

.pyc files are platform independent; you *can* use the same .pyc files
both on Windows and Linux.
A .pyc/.pyo file contains two bits of info:
- a magic number that depends on the Python version that created it
- the last-modification-time of the corresponding .py source
When you import a module, both numbers are read from the .pyc file. If the
magic number matches the version of the running Python, and the
modification time matches the one of the .py file (or no .py file exists),
then the .pyc file is used. In any other case, the .py file is read,
compiled, and a .pyc file is written -- if possible.

So, if you ensure that both platforms "see" the same
last-modification-time, and you use the same Python version on both
platforms, then .pyc files may be shared. If not, each time you switch
platforms all .pyc files will be re-created (option -B avoids that, as
already noted).

I any case, I don't think leaving the wrong .pyc files should create any
problem (except some delay when the application starts, and unless you've
found a bug, of course)

-- 
Gabriel Genellina



From ldo at geek-central.gen.new_zealand  Tue May 26 03:23:19 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 26 May 2009 19:23:19 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
Message-ID: <gvg5d7$382$2@lust.ihug.co.nz>

In message <pan.2009.05.26.06.39.41 at REMOVE.THIS.cybersource.com.au>, Steven 
D'Aprano wrote:

> On Tue, 26 May 2009 18:31:56 +1200, Lawrence D'Oliveiro wrote:
> 
>> In message <d6d05d39-98e7-4c28-
>> b201-4b2445732ab4 at v35g2000pro.googlegroups.com>, LittleGrasshopper
>> wrote:
>> 
>>> ... I am looking for suitable syntax files for [editor of choice] ...
>> 
>> I don't understand why people need "syntax files" to use a text editor.
> 
> Do you want syntax highlighting?

Why?



From petshmidt at googlemail.com  Tue May 26 03:29:00 2009
From: petshmidt at googlemail.com (Pet)
Date: Tue, 26 May 2009 00:29:00 -0700 (PDT)
Subject: unicode confusing
References: <ac50a990-d612-4ee2-931d-a07ecf98056e@37g2000yqp.googlegroups.com>
	<bd608c8b-be06-46ee-ac96-011e0e8db717@c9g2000yqm.googlegroups.com>
Message-ID: <6683d787-df69-4a26-9c55-20115cbae42f@z9g2000yqi.googlegroups.com>

On May 25, 6:07?pm, Paul Boddie <p... at boddie.org.uk> wrote:
> On 25 Mai, 17:39, someone <petshm... at googlemail.com> wrote:
>
> > Hi,
>
> > reading content of webpage (encoded in utf-8) with urllib2, I can't
> > get parsed data into DB
>
> > Exception:
>
> > ? File "/usr/lib/python2.5/site-packages/pyPgSQL/PgSQL.py", line 3111,
> > in execute
> > ? ? raise OperationalError, msg
> > libpq.OperationalError: ERROR: ?invalid UTF-8 byte sequence detected
> > near byte 0xe4
>
> > I've already checked several python unicode tutorials, but I have no
> > idea how to solve my problem.
>
> With pyPgSQL, there are a few tricks that you have to take into
> account:
>
> 1. With PostgreSQL, it would appear advantageous to create databases
> using the "-E unicode" option.

Hi,

DB is in UTF8


>
> 2. When connecting, use the client_encoding and unicode_results
> arguments for the connect function call:
>
> ? connection = PgSQL.connect(client_encoding="utf-8",
> unicode_results=1)

If I do unicode_results=1, then there are exceptions in other places,
e.g. urllib.urlencode(values)
cant encode values

>
> 3. After connecting, it appears necessary to set the client encoding
> explicitly:
>
> ? connection.cursor().execute("set client_encoding to unicode")

I've tried this as well, but still have exceptions

>
> I'd appreciate any suggestions which improve on the above, but what
> this should allow you to do is to present Unicode objects to the
> database and to receive such objects from queries. Whether you can
> relax this and pass UTF-8-encoded strings instead of Unicode objects
> is not something I can guarantee, but it's usually recommended that
> you manipulate Unicode objects in your program where possible, and
> here you should be able to let pyPgSQL deal with the encodings
> preferred by the database.
>

Thanks for your suggestions! Sadly, I can't solve my problem...

Pet

> Paul



From debatem1 at gmail.com  Tue May 26 03:48:08 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 26 May 2009 00:48:08 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au> 
	<gvg5d7$382$2@lust.ihug.co.nz>
Message-ID: <1122037b-4c3b-42f9-bdf9-a5eb2a0589f8@c9g2000yqm.googlegroups.com>

On May 26, 3:23?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <pan.2009.05.26.06.39... at REMOVE.THIS.cybersource.com.au>, Steven
>
> D'Aprano wrote:
> > On Tue, 26 May 2009 18:31:56 +1200, Lawrence D'Oliveiro wrote:
>
> >> In message <d6d05d39-98e7-4c28-
> >> b201-4b2445732... at v35g2000pro.googlegroups.com>, LittleGrasshopper
> >> wrote:
>
> >>> ... I am looking for suitable syntax files for [editor of choice] ...
>
> >> I don't understand why people need "syntax files" to use a text editor.
>
> > Do you want syntax highlighting?
>
> Why?

Provides a clear visual indicator of when you've screwed up, which is
pretty important for me ;)

Geremy Condra


From mail at microcorp.co.za  Tue May 26 03:58:40 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 26 May 2009 09:58:40 +0200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<pan.2009.05.26.05.01.13@REMOVE.THIS.cybersource.com.au>
Message-ID: <001801c9ddd7$d1891960$0d00a8c0@Hendrik>

"Steven D'Aprano" <stev... at source.com.au> wrote:

>I use kwrite when on a GUI. When I can't avoid editing files remotely
>over ssh, I use nano.
>
>Why? I dislike Gnome's user-interface, and I find gedit slightly too
>underpowered and dumbed down for my taste. (Although it has a couple of
>nice features.) Of the KDE editors, kedit is too basic and I've never got
>into kate, although perhaps I should. kwrite has a nice clean, consistent
>UI that matches other KDE apps, instead of being hideously ugly like some
>apps I won't mention.
>
Interesting - Kwrite is essentially a bit of a dumbed down Kate - and I use
both - for python stuff I use Kwrite, set up to indent with tabs, and for SDCL
and C code I use Kate, set up to indent with spaces.  I have not noticed a
difference
in the UI, except that Kate keeps a list of active files, and seems to remember
what you were doing last time you used it.  (on SuSe)

When ssh- ing I have been using vim, painfully. Must look at nano - sounds good.
I really miss Brief.

- Hendrik




From davea at ieee.org  Tue May 26 04:00:52 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 26 May 2009 04:00:52 -0400
Subject: Network programming ?
In-Reply-To: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
Message-ID: <4A1BA1B4.70900@ieee.org>

thushianthan15 at gmail.com wrote:
> Hi everyone,
>
> I am planning to develop a chatting software in Python, for my college
> project. I am using Windows Vista. Is it possible to do sockets
> programming in Python ? Any books or websites ?  Also, i want to
> develop a gui for that program. What are the gui tool kits available
> for windows? I already knew about PyGtk and PyQT, but will they work
> properly in Windows platform? Any suggestions?
>
> Thank you. Excuse my English.
>
>   
You're asking two very distinct questions, and I hope others will chime 
in, especially with the sockets one.

1)  There is a module called socket, for low level BSD socket access, 
and it does support Windows (plus Mac OSX, BeOS, OS/2, and "all modern 
Unix"   No experience with it, however.

2) There is tkInterf supplied with Python to do GUI development.  
However, when I studied the choices I knew about, I picked wxPython.  I 
don't even remember the other choices, because it's hard to learn more 
than one.

see:  http://www.python.org/
and http://wiki.wxpython.org/

Both totally free, and with very easy (msi) installers for Windows.

Watch out for versions, though.  If you're goin to run wxPython, you 
want to get Python 2.5x or 2.6x, nothing later.  And many say that  
wxPython for  2.5x is more stable,
Then when you download wxPython, you need to get the matching version.

 


From antroy at gmail.com  Tue May 26 04:04:24 2009
From: antroy at gmail.com (Ant)
Date: Tue, 26 May 2009 01:04:24 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <07992af4-7878-4c78-bd6f-6c520c6d61c5@r13g2000vbr.googlegroups.com>

On May 25, 6:35?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> With so many choices, I was wondering what editor is the one you
> prefer when coding Python, and why. I normally use vi, and just got

I use GVim or vim if on a terminal. There are quite a few plugins and
scripts I find invaluable, but most are not python specific, and many
are home grown (if compiled against python, you can script vim using
Python).


From petshmidt at googlemail.com  Tue May 26 04:09:37 2009
From: petshmidt at googlemail.com (Pet)
Date: Tue, 26 May 2009 01:09:37 -0700 (PDT)
Subject: unicode confusing
References: <ac50a990-d612-4ee2-931d-a07ecf98056e@37g2000yqp.googlegroups.com>
	<bd608c8b-be06-46ee-ac96-011e0e8db717@c9g2000yqm.googlegroups.com> 
	<6683d787-df69-4a26-9c55-20115cbae42f@z9g2000yqi.googlegroups.com>
Message-ID: <ab4b77ff-f3cf-4e9c-a2f6-19f1c9f1826e@z9g2000yqi.googlegroups.com>

On May 26, 9:29?am, Pet <petshm... at googlemail.com> wrote:
> On May 25, 6:07?pm, Paul Boddie <p... at boddie.org.uk> wrote:
>
>
>
>
>
> > On 25 Mai, 17:39, someone <petshm... at googlemail.com> wrote:
>
> > > Hi,
>
> > > reading content of webpage (encoded in utf-8) with urllib2, I can't
> > > get parsed data into DB
>
> > > Exception:
>
> > > ? File "/usr/lib/python2.5/site-packages/pyPgSQL/PgSQL.py", line 3111,
> > > in execute
> > > ? ? raise OperationalError, msg
> > > libpq.OperationalError: ERROR: ?invalid UTF-8 byte sequence detected
> > > near byte 0xe4
>
> > > I've already checked several python unicode tutorials, but I have no
> > > idea how to solve my problem.
>
> > With pyPgSQL, there are a few tricks that you have to take into
> > account:
>
> > 1. With PostgreSQL, it would appear advantageous to create databases
> > using the "-E unicode" option.
>
> Hi,
>
> DB is in UTF8
>
>
>
> > 2. When connecting, use the client_encoding and unicode_results
> > arguments for the connect function call:
>
> > ? connection = PgSQL.connect(client_encoding="utf-8",
> > unicode_results=1)
>
> If I do unicode_results=1, then there are exceptions in other places,
> e.g. urllib.urlencode(values)
> cant encode values
>
>
>
> > 3. After connecting, it appears necessary to set the client encoding
> > explicitly:
>
> > ? connection.cursor().execute("set client_encoding to unicode")
>
> I've tried this as well, but still have exceptions
>
>
>
> > I'd appreciate any suggestions which improve on the above, but what
> > this should allow you to do is to present Unicode objects to the
> > database and to receive such objects from queries. Whether you can
> > relax this and pass UTF-8-encoded strings instead of Unicode objects
> > is not something I can guarantee, but it's usually recommended that
> > you manipulate Unicode objects in your program where possible, and
> > here you should be able to let pyPgSQL deal with the encodings
> > preferred by the database.
>
> Thanks for your suggestions! Sadly, I can't solve my problem...
>
> Pet
>
>
>
> > Paul

After some time, I've tried, to convert result with unicode(result,
'ISO-8859-15') and that was it :)
I've thought it was already utf-8, because of charset defining in
<meta> of webpage I'm fetching
Pet


From Ron.Barak at lsi.com  Tue May 26 04:10:24 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Tue, 26 May 2009 09:10:24 +0100
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <m2tz38n0m5.fsf@valheru.db3l.homeip.net>
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
	<m2y6smm7lw.fsf@valheru.db3l.homeip.net>
	<mailman.696.1243233822.8015.python-list@python.org>
	<m2tz38n0m5.fsf@valheru.db3l.homeip.net>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF6701A252B@enbmail01.lsi.com>

Hi David, 
Thanks for the below solutions: most illuminating.
I implemented your previous message suggestions, and already the processing time (on my datasets) is within acceptable human times.
I'll try your suggestion below.
Thanks again.
Ron.

> -----Original Message-----
> From: David Bolen [mailto:db3l.net at gmail.com] 
> Sent: Tuesday, May 26, 2009 03:56
> To: python-list at python.org
> Subject: Re: A fast way to read last line of gzip archive ?
> 
> "Barak, Ron" <Ron.Barak at lsi.com> writes:
> 
> > I couldn't really go with the shell utilities approach, as 
> I have no 
> > say in my user environment, and thus cannot assume which 
> binaries are 
> > install on the user's machine.
> 
> I suppose if you knew your target you could just supply the 
> external binaries to go with your application, but I agree 
> that would probably be more of a pain than its worth for the 
> performance gain in real world time.
> 
> > I'll try and implement your last suggestion, and see if the 
> > performance is acceptable to (human) users.
> 
> In terms of tuning the third option a bit, I'd play with the 
> tracking of the final two chunk (as mentioned in my first 
> response), perhaps shrinking the chunk size or only 
> processing a smaller chunk of it for lines (assuming a 
> reasonable line size) to minimize the final loop.
> You could also try using splitlines() on the final buffer 
> rather than a StringIO wrapper, although that'll have a 
> memory hit for the constructed list but doing a small portion 
> of the buffer would minimize that.
> 
> I was curious what I could actually achieve, so here are 
> three variants that I came up with.
> 
> First, this just fine tunes slightly tracking the chunks and 
> then only processes enough final data based on anticipated 
> maximum length length (so if the final line is longer than 
> that you'll only get the final MAX_LINE bytes of that line).  
> I also found I got better performance using a smaller 1024 
> chunk size with GZipFile.read() than a MB - not entirely sure 
> why although it perhaps matches the internal buffer size
> better:
> 
>     # last-chunk-2.py
> 
>     import gzip
>     import sys
> 
>     CHUNK_SIZE = 1024
>     MAX_LINE = 255
> 
>     in_file = gzip.open(sys.argv[1],'r')
> 
>     chunk = prior_chunk = ''
>     while 1:
>         prior_chunk = chunk
>         # Note that CHUNK_SIZE here is in terms of decompressed data
>         chunk = in_file.read(CHUNK_SIZE)
>         if len(chunk) < CHUNK_SIZE:
>             break
> 
>     if len(chunk) < MAX_LINE:
>         chunk = prior_chunk + chunk
> 
>     line = chunk.splitlines(True)[-1]
>     print 'Last:', line
> 
> 
> On the same test set as my last post, this reduced the 
> last-chunk timing from about 2.7s to about 2.3s.
> 
> Now, if you're willing to play a little looser with the gzip 
> module, you can gain quite a bit more.  If you directly call 
> the internal _read() method you can bypass some of the 
> unnecessary processing read() does, and go back to larger I/O chunks:
> 
>     # last-gzip.py
> 
>     import gzip
>     import sys
> 
>     CHUNK_SIZE = 1024*1024
>     MAX_LINE = 255
> 
>     in_file = gzip.open(sys.argv[1],'r')
> 
>     chunk = prior_chunk = ''
>     while 1:
>         try:
>             # Note that CHUNK_SIZE here is raw data size, not 
> decompressed
>             in_file._read(CHUNK_SIZE)
>         except EOFError:
>             if in_file.extrasize < MAX_LINE:
>                 chunk = chunk + in_file.extrabuf
>             else:
>                 chunk = in_file.extrabuf
>             break
> 
>         chunk = in_file.extrabuf
>         in_file.extrabuf = ''
>         in_file.extrasize = 0
> 
>     line = chunk[-MAX_LINE:].splitlines(True)[-1]
>     print 'Last:', line
> 
> Note that in this case since I was able to bump up 
> CHUNK_SIZE, I take a slice to limit the work splitlines() has 
> to do and the size of the resulting list.  Using the larger 
> CHUNK_SIZE (and it being raw size) will use more memory, so 
> could be tuned down if necessary.
> 
> Of course, the risk here is that you are dependent on the 
> _read() method, and the internal use of the 
> extrabuf/extrasize attributes, which is where _read() places 
> the decompressed data.  In looking back I'm pretty sure this 
> code is safe at least for Python 2.4 through 3.0, but you'd 
> have to accept some risk in the future.
> 
> This approach got me down to 1.48s.
> 
> Then, just for the fun of it, once you're playing a little 
> looser with the gzip module, it's also doing work to compute 
> the crc of the original data for comparison with the 
> decompressed data.  If you don't mind so much about that 
> (depends on what you're using the line for) you can just do 
> your own raw decompression with the zlib module, as in the 
> following code, although I still start with a GzipFile() 
> object to avoid having to rewrite the header processing:
> 
>     # last-decompress.py
> 
>     import gzip
>     import sys
>     import zlib
> 
>     CHUNK_SIZE = 1024*1024
>     MAX_LINE = 255
> 
>     decompress = zlib.decompressobj(-zlib.MAX_WBITS)
> 
>     in_file = gzip.open(sys.argv[1],'r')
>     in_file._read_gzip_header()
> 
>     chunk = prior_chunk = ''
>     while 1:
>         buf = in_file.fileobj.read(CHUNK_SIZE)
>         if not buf:
>             break
>         d_buf = decompress.decompress(buf)
>         # We might not have been at EOF in the read() but 
> still have no
>         # decompressed data if the only remaining data was 
> not original data
>         if d_buf:
>             prior_chunk = chunk
>             chunk = d_buf
> 
>     if len(chunk) < MAX_LINE:
>         chunk = prior_chunk + chunk
> 
>     line = chunk[-MAX_LINE:].splitlines(True)[-1]
>     print 'Last:', line
> 
> This version got me down to 1.15s.
> 
> So in summary, the choices when tested on my system ended up at:
> 
>     last             26
>     last-chunk        2.7
>     last-chunk-2      2.3
>     last-popen        1.7
>     last-gzip         1.48
>     last-decompress   1.12
> 
> So by being willing to mix in some more direct code with the 
> GzipFile object, I was able to beat the overhead of shelling 
> out to the faster utilities, while remaining in pure Python.
> 
> -- David
> 
> 

From mail at microcorp.co.za  Tue May 26 04:13:51 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 26 May 2009 10:13:51 +0200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com><gvg2cs$1a0$2@lust.ihug.co.nz><pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
Message-ID: <002501c9ddd9$e89b3fa0$0d00a8c0@Hendrik>

"Lawrence D'Oliveiro" <ldo at geek....new_zealand> wrote:

> In message <pan.2009.05.26.06.39.41 at REMOVE.THIS.cybersource.com.au>, Steven 
> D'Aprano wrote:
> 
> > On Tue, 26 May 2009 18:31:56 +1200, Lawrence D'Oliveiro wrote:
> > 
> >> In message <d6d05d39-98e7-4c28-
> >> b201-4b2445732ab4 at v35g2000pro.googlegroups.com>, LittleGrasshopper
> >> wrote:
> >> 
> >>> ... I am looking for suitable syntax files for [editor of choice] ...
> >> 
> >> I don't understand why people need "syntax files" to use a text editor.
> > 
> > Do you want syntax highlighting?
> 
> Why?

It makes your screen look more busy as you type - for instance, if you
type a " or a ' then it treats the rest of the file from that point on as 
belonging to the same string you are about to start typing, and colours it
all using the colour you have selected for displaying string literals.
This is basically to make you seasick and to force you to type the closing
quote immediately and then to back arrow to inside the string again to finish
typing the string, thereby making sure that firstly you type more keystrokes, 
which will look good on your productivity summary, and secondly to save the
Python parser the hassle of dealing with a string that has no end quote.

Now with a recommendation like that - how can you possibly refuse to use
this excellent technology - are you some kind of Luddite, or what?

:-) - Hendrik




From piet at cs.uu.nl  Tue May 26 04:17:48 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Tue, 26 May 2009 10:17:48 +0200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<mailman.726.1243274859.8015.python-list@python.org>
Message-ID: <m2eiuc6zwz.fsf@cs.uu.nl>

>>>>> Esmail <ebonak at hotmail.com> (E) wrote:

>E> LittleGrasshopper wrote:
>>> 
>>> So what do you guys use, and why? Hopefully we can keep this civil.

>E> I use Emacs, just because I have been using this editor for
>E> all sorts of things in the last 20+ years.

Me too. I like my tools to be programmable.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From paul at boddie.org.uk  Tue May 26 04:29:28 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Tue, 26 May 2009 01:29:28 -0700 (PDT)
Subject: unicode confusing
References: <ac50a990-d612-4ee2-931d-a07ecf98056e@37g2000yqp.googlegroups.com>
	<bd608c8b-be06-46ee-ac96-011e0e8db717@c9g2000yqm.googlegroups.com> 
	<6683d787-df69-4a26-9c55-20115cbae42f@z9g2000yqi.googlegroups.com> 
	<ab4b77ff-f3cf-4e9c-a2f6-19f1c9f1826e@z9g2000yqi.googlegroups.com>
Message-ID: <31ff6688-3d09-43c1-a5d1-f7c373bac50b@z9g2000yqi.googlegroups.com>

On 26 Mai, 10:09, Pet <petshm... at googlemail.com> wrote:
>
> After some time, I've tried, to convert result with unicode(result,
> 'ISO-8859-15') and that was it :)

I haven't really investigated having unicode_results set to false (or
the default) with a database containing UTF-8 (or any non-ASCII
encoded) text, since it's always desirable to manipulate Unicode
internally in one's programs: I don't want plain strings containing
various encoded sequences of bytes when I'm dealing with characters.
That said, if one were consuming XML/HTML and then putting it in raw
form into a database (including the tags), I could understand that
Unicode objects might then seem like a distraction.

> I've thought it was already utf-8, because of charset defining in
> <meta> of webpage I'm fetching

There are lots of caveats about Web page encodings - which metadata
actually indicates the encoding - but I still regard the best approach
to involve converting text to Unicode as soon as possible, then
presenting Unicode objects to the database. This way, you can separate
the decisions about which encodings the Web pages are using and which
encoding the database is using.

Paul


From jeremiah.dodds at gmail.com  Tue May 26 04:31:32 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Tue, 26 May 2009 09:31:32 +0100
Subject: What text editor is everyone using for Python
In-Reply-To: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <12cbbbfc0905260131x7f1b3fd4g75ff7c038cb3c20a@mail.gmail.com>

On Mon, May 25, 2009 at 6:35 PM, LittleGrasshopper
<seattlehanks at yahoo.com>wrote:

> With so many choices, I was wondering what editor is the one you
> prefer when coding Python, and why. I normally use vi, and just got
> into Python, so I am looking for suitable syntax files for it, and
> extra utilities. I dabbled with emacs at some point, but couldn't get
> through the key bindings for commands. I've never tried emacs with vi
> keybindings (I forgot the name of it) but I've been tempted.
>
> So what do you guys use, and why? Hopefully we can keep this civil.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I, like some others on this list, use emacs.

I've heard that vi (well, vim) makes a pretty nice python editor though. If
you're comfortable with it, keep using it.
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From kalyanchakravarthy at hyit.com  Tue May 26 04:33:06 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Tue, 26 May 2009 14:03:06 +0530
Subject: which database is suitable for small applications
Message-ID: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>

Hi All,
          can any one suggest me which database I can use for my small
application(to store user names ,passwords, very few other data.. )
I am using Python, Google Apps and guide me how to connect to database, I am
very new to these technologies

Please help me

Thanks in advance

-- 
Regards
Kalyan
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From arnodel at googlemail.com  Tue May 26 04:46:04 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 26 May 2009 09:46:04 +0100
Subject: exec statement with/without prior compile...
References: <97a8f1a70905250707m413e428ei63494285248d0afa@mail.gmail.com>
	<mailman.736.1243322388.8015.python-list@python.org>
Message-ID: <m2ljok2qwj.fsf@googlemail.com>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:

> En Mon, 25 May 2009 11:07:13 -0300, Jaime Fernandez del Rio
> <jaime.frio at gmail.com> escribi?:
>> And since I'm asking, could something similar, i.e. defining a new
>> function and get a handle to it, be achieved with eval?
>
> No, because def is a statement, and eval only accepts an expression.

Well there is the lambda expression, which would work in the example
given in the OP.

-- 
Arnaud


From enzomich at gmail.com  Tue May 26 04:51:20 2009
From: enzomich at gmail.com (enzo michelangeli)
Date: Tue, 26 May 2009 01:51:20 -0700 (PDT)
Subject: How to create a list of functions depending on a parameter?
Message-ID: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>

Let's suppose I want to create a list of n functions of a single
argument, returning the sum between argument and index in the list, so
that e.g.:

f[0](10) will return 10
f[3](12) will return 15

...and so on. I had naively though of coding:

 f = [lambda x: x+j for j in range(n)]

Unfortunately, each function in the list f[]() behaves as a closure,
and f[k](p) does NOT return p+k but p+j (for whatever value j has at
the moment: typically n, the last value assumed by j in the list
comprehension loop).

Is there a way of achieving my goal? (Of course, n is not a constant
known in advance, so I can't manually unroll the loop.)

Thanks for any suggestion.


From steven at REMOVE.THIS.cybersource.com.au  Tue May 26 04:56:03 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 26 May 2009 08:56:03 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<pan.2009.05.26.05.01.13@REMOVE.THIS.cybersource.com.au>
	<mailman.738.1243324787.8015.python-list@python.org>
Message-ID: <pan.2009.05.26.08.56.03@REMOVE.THIS.cybersource.com.au>

On Tue, 26 May 2009 09:58:40 +0200, Hendrik van Rooyen wrote:

> "Steven D'Aprano" <stev... at source.com.au> wrote:
> 
>>I use kwrite when on a GUI. When I can't avoid editing files remotely
>>over ssh, I use nano.
>>
>>Why? I dislike Gnome's user-interface, and I find gedit slightly too
>>underpowered and dumbed down for my taste. (Although it has a couple of
>>nice features.) Of the KDE editors, kedit is too basic and I've never
>>got into kate, although perhaps I should. kwrite has a nice clean,
>>consistent UI that matches other KDE apps, instead of being hideously
>>ugly like some apps I won't mention.
>>
> Interesting - Kwrite is essentially a bit of a dumbed down Kate - and I
> use both - for python stuff I use Kwrite, set up to indent with tabs,
> and for SDCL and C code I use Kate, set up to indent with spaces.  I
> have not noticed a difference
> in the UI, except that Kate keeps a list of active files, and seems to
> remember what you were doing last time you used it.  (on SuSe)


By memory, I started using kwrite before kate even existed, or at least 
before it was included in KDE.

I think the most obvious difference is that kwrite uses one window per 
open file, and kate uses a single IDE-style window for all open files.



> When ssh- ing I have been using vim, painfully. Must look at nano -
> sounds good. I really miss Brief.

nano is basically an updated (forked?) version of pico.



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Tue May 26 04:57:48 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 26 May 2009 08:57:48 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
	<gvb8kn$7gm$2@lust.ihug.co.nz>
	<mailman.674.1243192904.8015.python-list@python.org>
	<gvd6c0$bqs$1@lust.ihug.co.nz>
	<pan.2009.05.25.05.22.14@REMOVE.THIS.cybersource.com.au>
	<FoidnSoDAqr_G4bXnZ2dnUVZ_gSdnZ2d@pdx.net>
Message-ID: <pan.2009.05.26.08.57.47@REMOVE.THIS.cybersource.com.au>

On Mon, 25 May 2009 23:10:02 -0700, Scott David Daniels wrote:

> Steven D'Aprano wrote:
>> On Mon, 25 May 2009 16:21:19 +1200, Lawrence D'Oliveiro wrote:
>>... (0) "Opposite" is not well-defined unless you have a dichotomy. In
>>the ... (1/3) Why do you jump to the conclusion that "pi=3" implies that
>>only ... (1/2) If you "get rid of real numbers", then obviously you must
>>have a ... (2/3) There is *no* point (2/3).
>>... (1) I thought about numbering my points as consecutive increasing
>> integers, but decided that was an awfully boring convention. A shiny
>> banananana for the first person to recognise the sequence.
> 
> I'd call it F_3, but using a Germanic F (Farey sequence limit 3).

That's the one.


> Do I get a banana or one with a few more ans?

I know how to spell bananananana, I just don't know when to stop.





-- 
Steven


From paul.nospam at rudin.co.uk  Tue May 26 05:00:14 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Tue, 26 May 2009 10:00:14 +0100
Subject: How to create a list of functions depending on a parameter?
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
Message-ID: <87fxes6xy9.fsf@rudin.co.uk>

enzo michelangeli <enzomich at gmail.com> writes:

> Let's suppose I want to create a list of n functions of a single
> argument, returning the sum between argument and index in the list, so
> that e.g.:
>
> f[0](10) will return 10
> f[3](12) will return 15
>
> ...and so on. I had naively though of coding:
>
>  f = [lambda x: x+j for j in range(n)]
>
> Unfortunately, each function in the list f[]() behaves as a closure,
> and f[k](p) does NOT return p+k but p+j (for whatever value j has at
> the moment: typically n, the last value assumed by j in the list
> comprehension loop).
>
> Is there a way of achieving my goal? (Of course, n is not a constant
> known in advance, so I can't manually unroll the loop.)
>

class Foo(object):

    def __init__(self, pos):
        self.pos = pos
        
    def __call__(self, arg):
        return self.pos + arg

f = [Foo(x) for x in range(10)]


From deets at nospam.web.de  Tue May 26 05:05:30 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 26 May 2009 11:05:30 +0200
Subject: How to create a list of functions depending on a parameter?
In-Reply-To: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
Message-ID: <781pmqF1k8bt5U1@mid.uni-berlin.de>

enzo michelangeli schrieb:
> Let's suppose I want to create a list of n functions of a single
> argument, returning the sum between argument and index in the list, so
> that e.g.:
> 
> f[0](10) will return 10
> f[3](12) will return 15
> 
> ...and so on. I had naively though of coding:
> 
>  f = [lambda x: x+j for j in range(n)]
> 
> Unfortunately, each function in the list f[]() behaves as a closure,
> and f[k](p) does NOT return p+k but p+j (for whatever value j has at
> the moment: typically n, the last value assumed by j in the list
> comprehension loop).
> 
> Is there a way of achieving my goal? (Of course, n is not a constant
> known in advance, so I can't manually unroll the loop.)

You need to capture n into the closure of the lambda:

f = [lambda x, n=n: x+j for j in xrange(n)]

Also note the use of xrange instead of range - the latter creates a 
list-object while the former only returns a generator. Most of the 
times, xrange is thus faster, and also most of the times less memory 
consuming (exception to this rule occur for small n, and are neglible)

Diez


From steven at REMOVE.THIS.cybersource.com.au  Tue May 26 05:10:41 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 26 May 2009 09:10:41 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
Message-ID: <pan.2009.05.26.09.10.40@REMOVE.THIS.cybersource.com.au>

On Tue, 26 May 2009 19:23:19 +1200, Lawrence D'Oliveiro wrote:

> In message <pan.2009.05.26.06.39.41 at REMOVE.THIS.cybersource.com.au>,
> Steven D'Aprano wrote:
> 
>> On Tue, 26 May 2009 18:31:56 +1200, Lawrence D'Oliveiro wrote:
>> 
>>> In message <d6d05d39-98e7-4c28-
>>> b201-4b2445732ab4 at v35g2000pro.googlegroups.com>, LittleGrasshopper
>>> wrote:
>>> 
>>>> ... I am looking for suitable syntax files for [editor of choice] ...
>>> 
>>> I don't understand why people need "syntax files" to use a text
>>> editor.
>> 
>> Do you want syntax highlighting?
> 
> Why?

The human visual system is evolved to detect, and respond to, differences 
in the frequency of light entering the eye. This is called "colour", and 
colour can be used to make certain things stand out more than others, or 
fade more into the background. *wink*

The use of colour not only increases the bandwidth of information 
entering the brain, but it can be used to discriminate between what's 
important and what isn't. Personally, I find that it is worth having 
syntax highlighting just to get comments displayed in grey instead of 
black. Everything else is a bonus: e.g. I can instantly tell if I 
neglected to close a string, because my code displays in red.



-- 
Steven


From paul.nospam at rudin.co.uk  Tue May 26 05:14:35 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Tue, 26 May 2009 10:14:35 +0100
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<pan.2009.05.26.09.10.40@REMOVE.THIS.cybersource.com.au>
Message-ID: <87bppg6xac.fsf@rudin.co.uk>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:

>  e.g. I can instantly tell if I neglected to close a string, because
> my code displays in red.

I like syntax hightlighting for whitespace related things in python. e.g
to highlight tabs, or whitespace at the end of a line.


From paul.nospam at rudin.co.uk  Tue May 26 05:16:32 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Tue, 26 May 2009 10:16:32 +0100
Subject: How to create a list of functions depending on a parameter?
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
	<781pmqF1k8bt5U1@mid.uni-berlin.de>
Message-ID: <877i046x73.fsf@rudin.co.uk>

"Diez B. Roggisch" <deets at nospam.web.de> writes:

> enzo michelangeli schrieb:
>> Let's suppose I want to create a list of n functions of a single
>> argument, returning the sum between argument and index in the list, so
>> that e.g.:
>>
>> f[0](10) will return 10
>> f[3](12) will return 15
>>
>> ...and so on. I had naively though of coding:
>>
>>  f = [lambda x: x+j for j in range(n)]
>>
>> Unfortunately, each function in the list f[]() behaves as a closure,
>> and f[k](p) does NOT return p+k but p+j (for whatever value j has at
>> the moment: typically n, the last value assumed by j in the list
>> comprehension loop).
>>
>> Is there a way of achieving my goal? (Of course, n is not a constant
>> known in advance, so I can't manually unroll the loop.)
>
> You need to capture n into the closure of the lambda:
>
> f = [lambda x, n=n: x+j for j in xrange(n)]
>

But be careful using such a technique with mutable arguments...



From arnodel at googlemail.com  Tue May 26 05:20:41 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 26 May 2009 10:20:41 +0100
Subject: How to create a list of functions depending on a parameter?
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
	<781pmqF1k8bt5U1@mid.uni-berlin.de>
Message-ID: <m2hbz82pau.fsf@googlemail.com>

"Diez B. Roggisch" <deets at nospam.web.de> writes:

> You need to capture n into the closure of the lambda:
>
> f = [lambda x, n=n: x+j for j in xrange(n)]

You mean  [lambda x, j=j: x+j for j in xrange(n)]

Another way would be [(lambda j:lambda x: x+j)(j) for j in xrange(n)]

Or more readably:

def adder(n):
    return lambda x: x+n

[adder(j) for j in xrange(n)]

-- 
Arnaud


From enzomich at gmail.com  Tue May 26 05:32:05 2009
From: enzomich at gmail.com (enzo michelangeli)
Date: Tue, 26 May 2009 02:32:05 -0700 (PDT)
Subject: How to create a list of functions depending on a parameter?
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
	<781pmqF1k8bt5U1@mid.uni-berlin.de> <m2hbz82pau.fsf@googlemail.com>
Message-ID: <559c69f9-eb2c-4991-9a1a-ecb66ed3eab8@d25g2000prn.googlegroups.com>

Thanks guys. So far I had only come out with

f = [eval('lambda x: x+'+str(j)) for j in range(3)]

...which I hated because, as everybody knows, eval is evil :-)

Enzo

On May 26, 5:20?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
> "Diez B. Roggisch" <de... at nospam.web.de> writes:
>
> > You need to capture n into the closure of the lambda:
>
> > f = [lambda x, n=n: x+j for j in xrange(n)]
>
> You mean ?[lambda x, j=j: x+j for j in xrange(n)]
>
> Another way would be [(lambda j:lambda x: x+j)(j) for j in xrange(n)]
>
> Or more readably:
>
> def adder(n):
> ? ? return lambda x: x+n
>
> [adder(j) for j in xrange(n)]
>
> --
> Arnaud



From youhvee at googlemail.com  Tue May 26 05:45:40 2009
From: youhvee at googlemail.com (youhvee at googlemail.com)
Date: Tue, 26 May 2009 02:45:40 -0700 (PDT)
Subject: A list with periodic boundary conditions
References: <0f324d00-875a-4d18-bd8b-981997a34e44@q14g2000vbn.googlegroups.com>
	<mailman.539.1242948009.8015.python-list@python.org>
Message-ID: <32856758-88db-427a-9df0-99b6b3f791f9@m17g2000vbi.googlegroups.com>


Rodhri,

thank you very much for your reply. I've tried to extend what you
suggested; I think it can be made to work, but you're right -- it gets
horrid rapidly. I'm at the start of what promises to be a large
project, and I want to make sure that I get my data structures right,
but my impression right now is that the memory efficiency of views is
negated by the computational complexity of their implementation. So I
think I will stick to copies and be done with it.

For the record, part of the reason I wanted a view was that my class
will be inherited from numpy.ndarray, where, by default, slices return
views.

Thanks again,

-AM

On 22 May, 00:20, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> On Thu, 21 May 2009 13:08:39 +0100, <youh... at googlemail.com> wrote:
> > Hi,
>
> > I'm trying to create a new class of list that has periodic boundary
> > conditions.
>
> > Here's what I have so far:
>
> > class wrappedList(list):
> > ? ? def __getitem__(self, p):
> > ? ? ? ? return list.__getitem__(self, p%len(self))
> > ? ? def __setitem__(self, p, v):
> > ? ? ? ? list.__setitem__(self, p%len(self), v)
>
> >>>>> a=wrappedList(range(10))
> >>>>> a[1]
> > 1
> >>>>> a[11]
> > 1
>
> > But I would also like to make slices. For instance I would like
> >>>>> a[8:11]
> > [8, 9, 0]
>
> > I can do it by copying, but I want to return a view to the original
> > data, and I have no idea where to start. It seems that the slice needs
> > to retain some knowledge of the list from which it derived. i.e. it
> > needs to know that it is a slice. Any ideas on how I can extend this
> > to allow views?
>
> Reading the docs, this looks like a very messy area of Python 2.x in
> that for a builtin like `list` you have to provide a __getslice__ method
> despite it being deprecated and only dealing with simple slices. ?Good
> luck with that. ?In Python 3, you just have to deal with the fact that
> your __getitem__ and __setitem__ `p` arguments can be slice objects
> instead of integers.
>
> If you're set on making your slices views on the original (which means
> that changes to the slice will change the original, unlike normal lists!)
> then you need to extend your class to remember what it's viewing, and
> what the start, stop and step of the slice were. ?When it's a view, it
> passes (massaged) requests up to its parent. ?There's a cute (but likely
> inefficient) way of doing this that uses the fact that your view is still
> a list under the hood, and stashes the parental indices in it. ?This will
> also make len() work correctly, for a bonus :-) ?It gets quite horrid
> quite fast, but here's a very incomplete untested skeleton:
>
> class wrappedList(list):
> ? ?def __init__(self, parent=None, *args):
> ? ? ?list.__init__(self, *args)
> ? ? ?self.parent = parent
>
> ? ?def __getitem__(self, p):
> ? ? ?if self.parent is None:
> ? ? ? ?self.primary_getitem(p)
> ? ? ?else:
> ? ? ? ?self.view_getitem(p)
>
> ? ?def view_getitem(self, p):
> ? ? ?return self.parent[list.__getitem__(self, p%len(self))]
>
> ...and similarly for __setitem__, where primary_getitem() is your
> previous __getitem__ method. ?All four need to be modified to cope
> with slices, of course, and to create new wrappedList objects.
> Something like this:
>
> ? ?if isinstance(p, slice):
> ? ? ?if p.start is None:
> ? ? ? ?start = 0
> ? ? ?else:
> ? ? ? ?start = p.start
> ? ? ?if p.step is None:
> ? ? ? ?step = 1
> ? ? ?else:
> ? ? ? ?step = p.step
> ? ? ?indices = range(start, p.stop, step)
> ? ? ?return wrappedList(indices, parent=self)
>
> This will go horribly, horribly wrong if you delete anything from
> your original list, but I can't off-hand think of a view method
> that won't.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses



From debatem1 at gmail.com  Tue May 26 06:00:21 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 26 May 2009 03:00:21 -0700 (PDT)
Subject: Network programming ?
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
Message-ID: <a4ec6a83-7624-4529-ba1d-09b137376b78@k2g2000yql.googlegroups.com>

On May 25, 11:05?pm, thushiantha... at gmail.com wrote:
> Hi everyone,
>
> I am planning to develop a chatting software in Python, for my college
> project. I am using Windows Vista. Is it possible to do sockets
> programming in Python ? Any books or websites ? ?Also, i want to
> develop a gui for that program. What are the gui tool kits available
> for windows? I already knew about PyGtk and PyQT, but will they work
> properly in Windows platform? Any suggestions?
>
> Thank you. Excuse my English.

There's a book called Foundations of Python Network Programming that
is
pretty much as good a book as you could ever ask for on the subject. I
strongly recommend it, and I think you'll find many of the examples
relevant.

As far as PyGTK and PyQT, my understanding is that they will work, but
require some effort. You may want to look at PyGUI, which I haven't
used
but have consistently heard good things about- they seem to have good
windows support.

Geremy Condra


From bruno.42.desthuilliers at websiteburo.invalid  Tue May 26 06:06:05 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 26 May 2009 12:06:05 +0200
Subject: Are Python-based web frameworks reliable enough?
In-Reply-To: <7opl151anck3qve09uu88t67khgbd9ob1t@4ax.com>
References: <7opl151anck3qve09uu88t67khgbd9ob1t@4ax.com>
Message-ID: <4a1bbf08$0$20352$426a74cc@news.free.fr>

Gilles Ganault a ?crit :
> Hello
> 
> 	Until now, the modest web apps I wrote were all in PHP because it's
> available on just about any hosted server.
> 
> I now have a couple of ideas for applications where I would deploy my
> own servers, so that I'd rather write them in Python because I find
> the language more pleasant to write with.
> 
> I read that the traction for the mod_python module isn't as strong as
> mod_php, so I guess I should consider the alternative, which is
> writing a long-running process with some framework like TurboGears or
> Django.
> 
> To make an informed choice, I'd like your feedback on this:
> 
> 1. Is mod_python a bad choice today? If yes, are there other PHP-like
> modules available, ie. the Python code is hosted in pages that are
> loaded every time a user calls them?

I indeed wouldn't use mod_python for web app development, unless I need 
really strong integration with apache and don't care for portability (=> 
  deploying on other web servers).

And while we're at it, the server page model (PHP etc) is just braindead 
for anything more complicated than a simple personal home page. FWIW, 
even PHP coders tend to go away from it and turn to more "structured" 
frameworks like Symfony or CakePHP - which look much more like Django, 
TG, Pylons or (for CakePHP) Ruby On Rails.

> 2. If you think I should consider long-running processes, are the
> frameworks reliable enough so that I shouldn't fear crashes every so
> often?

My experience is that they are usually much more reliable than most PHP 
code around.

> 3. What about performance as compared to equivalent PHP/MySQL apps?

The right question here would be "what about performances as compared to 
equivalent PHP apps of equivalent quality written using similar 
frameworks, deployed on equivalent web servers and getting equivalent 
loads".

Ok, to make a long story short: I never had any performance issues so 
far with app written in Django, and never heard of anyone reporting such 
issues. <troll>I whish I could say the same about Zope/Plone...</troll>


From jeanmichel at sequans.com  Tue May 26 06:24:14 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 26 May 2009 12:24:14 +0200
Subject: which database is suitable for small applications
In-Reply-To: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
Message-ID: <4A1BC34E.2010201@sequans.com>

Kalyan Chakravarthy wrote:
> Hi All,
>           can any one suggest me which database I can use for my small 
> application(to store user names ,passwords, very few other data.. )
> I am using Python, Google Apps and guide me how to connect to 
> database, I am very new to these technologies
>
> Please help me
>
> Thanks in advance
>
> -- 
> Regards
> Kalyan
>
If you are really new to these technologies and don't want to spend some 
time on it, just serialize on the disk your data structure containing 
your names, password and so on (http://docs.python.org/library/pickle.html).
Depending on your application you may not be that concerned with 
security/reliability issues.

Of course if you want to learn more about it, go on. I personally use 
postgreSQL with the pgdb python module. But this is the only one I ever 
used so I'll let someone else more familiar with all the database types 
respond to you.

Jean-Michel


From deets at nospam.web.de  Tue May 26 06:37:47 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 26 May 2009 12:37:47 +0200
Subject: How to create a list of functions depending on a parameter?
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
	<781pmqF1k8bt5U1@mid.uni-berlin.de> <877i046x73.fsf@rudin.co.uk>
Message-ID: <781uvhF1ifcomU1@mid.uni-berlin.de>

Paul Rudin wrote:

> "Diez B. Roggisch" <deets at nospam.web.de> writes:
> 
>> enzo michelangeli schrieb:
>>> Let's suppose I want to create a list of n functions of a single
>>> argument, returning the sum between argument and index in the list, so
>>> that e.g.:
>>>
>>> f[0](10) will return 10
>>> f[3](12) will return 15
>>>
>>> ...and so on. I had naively though of coding:
>>>
>>>  f = [lambda x: x+j for j in range(n)]
>>>
>>> Unfortunately, each function in the list f[]() behaves as a closure,
>>> and f[k](p) does NOT return p+k but p+j (for whatever value j has at
>>> the moment: typically n, the last value assumed by j in the list
>>> comprehension loop).
>>>
>>> Is there a way of achieving my goal? (Of course, n is not a constant
>>> known in advance, so I can't manually unroll the loop.)
>>
>> You need to capture n into the closure of the lambda:
>>
>> f = [lambda x, n=n: x+j for j in xrange(n)]
>>
> 
> But be careful using such a technique with mutable arguments...

What makes "this technique" more susceptible to mutable argument issues than
any other function or method-definition?

Diez


From deets at nospam.web.de  Tue May 26 06:39:08 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 26 May 2009 12:39:08 +0200
Subject: How to create a list of functions depending on a parameter?
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
	<781pmqF1k8bt5U1@mid.uni-berlin.de> <m2hbz82pau.fsf@googlemail.com>
Message-ID: <781v22F1ifcomU2@mid.uni-berlin.de>

Arnaud Delobelle wrote:

> "Diez B. Roggisch" <deets at nospam.web.de> writes:
> 
>> You need to capture n into the closure of the lambda:
>>
>> f = [lambda x, n=n: x+j for j in xrange(n)]
> 
> You mean  [lambda x, j=j: x+j for j in xrange(n)]


Ah, sorry, parentheses-problem.

Diez




From ldo at geek-central.gen.new_zealand  Tue May 26 07:35:55 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 26 May 2009 23:35:55 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
Message-ID: <gvgk6s$bpr$1@lust.ihug.co.nz>

In message <mailman.741.1243325683.8015.python-list at python.org>, Hendrik van 
Rooyen wrote:

> "Lawrence D'Oliveiro" <ldo at geek....new_zealand> wrote:
>> 
>> Why [do you want syntax highlighting]?
> 
> It makes your screen look more busy as you type - for instance, if you
> type a " or a ' then it treats the rest of the file from that point on as
> belonging to the same string you are about to start typing, and colours it
> all using the colour you have selected for displaying string literals.
> This is basically to make you seasick and to force you to type the closing
> quote immediately and then to back arrow to inside the string again to
> finish typing the string, thereby making sure that firstly you type more
> keystrokes, which will look good on your productivity summary, and
> secondly to save the Python parser the hassle of dealing with a string
> that has no end quote.

Yeah, that's about what I figured. I think I first came across it 15 years 
ago in Metrowerks CodeWarrior. I tried it for a while, but it didn't really 
help with any of my program bugs, so I turned it off.




From John at nospam.net  Tue May 26 07:42:01 2009
From: John at nospam.net (John)
Date: Tue, 26 May 2009 07:42:01 -0400
Subject: What is the difference between init and enter?
Message-ID: <gvgkiv$61t$1@aioe.org>

I'm okay with init, but it seems to me that enter is redundant since it 
appears that anything you want to execute in enter can be done in init.


From gabriel.rossetti at arimaz.com  Tue May 26 07:46:49 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Tue, 26 May 2009 13:46:49 +0200
Subject: DB-API execute params, am I missing something?
Message-ID: <4A1BD6A9.8090809@arimaz.com>

Hello everyone, I am trying to use dbapi with mysql and I get this error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 2, in getUnitParams
  File "/var/lib/python-support/python2.5/MySQLdb/cursors.py", line 151, 
in execute
    query = query % db.literal(args)
TypeError: int argument required

with this code :

import MySQLdb

def getParams(curs):
    curs.execute("select * from param where id=%d", 1001)
    return curs.fetchall()

cp = MySQLdb.connect(host="localhost",
                     port=3306,
                     user="root",
                     passwd="123",
                     db="test")

curs = cp.cursor()
result = getParams(curs)

I checked MySQLdb.paramstyle and it uses "format". I also tried passing 
(1001,) instead of just 1001 as the param but this changes nothing. What 
am I doing wrong?

Thank you,
Gabriel


From kushal.kumaran at gmail.com  Tue May 26 07:50:17 2009
From: kushal.kumaran at gmail.com (Kushal Kumaran)
Date: Tue, 26 May 2009 17:20:17 +0530
Subject: which database is suitable for small applications
In-Reply-To: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
Message-ID: <1e364c4e0905260450p271c3079wfc5a0acac1ad9491@mail.gmail.com>

On Tue, May 26, 2009 at 2:03 PM, Kalyan Chakravarthy
<kalyanchakravarthy at hyit.com> wrote:
> Hi All,
> ????????? can any one suggest me which database I can use for my small
> application(to store user names ,passwords, very few other data.. )
> I am using Python, Google Apps and guide me how to connect to database, I am
> very new to these technologies
>

Going by your previous mail, I assume you meant Google App Engine when
you said Google Apps.  Given that, searching for google app engine
database gives http://code.google.com/appengine/docs/python/gettingstarted/usingdatastore.html
as the first result.

-- 
kushal


From deets at nospam.web.de  Tue May 26 07:52:41 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 26 May 2009 13:52:41 +0200
Subject: What is the difference between init and enter?
References: <gvgkiv$61t$1@aioe.org>
Message-ID: <7823bvF1k6ml9U1@mid.uni-berlin.de>

John wrote:

> I'm okay with init, but it seems to me that enter is redundant since it
> appears that anything you want to execute in enter can be done in init.

About what are you talking? 

Diez


From Lacrima.Maxim at gmail.com  Tue May 26 08:07:23 2009
From: Lacrima.Maxim at gmail.com (Lacrima)
Date: Tue, 26 May 2009 05:07:23 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
Message-ID: <9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>

I am new to python.
And now I am using trial version of Wing IDE.
But nobody mentioned it as a favourite editor.
So should I buy it when trial is expired or there are better choices?


From skip at pobox.com  Tue May 26 08:12:04 2009
From: skip at pobox.com (skip at pobox.com)
Date: Tue, 26 May 2009 07:12:04 -0500
Subject: email scanning for X-Spam-Score
In-Reply-To: <77vc0bF1ikvrgU1@mid.dfncis.de>
References: <77vc0bF1ikvrgU1@mid.dfncis.de>
Message-ID: <18971.56468.629602.606367@montanaro.dyndns.org>

    Helmut>    mailmsg = email.message_from_string(msg)
    Helmut>    SPAM_CORE = mailmsg['X-Spam-Score']

Maybe lower case?

    SPAM_CORE = mailmsg['x-spam-score']

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/
    America's vaunted "free press" notwithstanding, story ideas that expose
    the unseemly side of actual or potential advertisers tend to fall by the
    wayside.  Not quite sure why.  -- Jim Thornton


From konrad.hinsen at laposte.net  Tue May 26 08:19:07 2009
From: konrad.hinsen at laposte.net (Konrad Hinsen)
Date: Tue, 26 May 2009 14:19:07 +0200
Subject: Building Python with icc on 64-bit Linux
Message-ID: <1DFB4A5E-0A88-4473-BB37-A5E4A668BF8E@laposte.net>

I am trying to install Python 2.6.2 on a 64-bit Linux machine (RedHat  
Enterprise) using the Intel compiler (version 11). Even without  
optimizations (-O0), I get a compilation error in the ctypes module

icc -pthread -fPIC -fno-strict-aliasing -DNDEBUG -O0 -I. -I/home/shr/ 
khinsen/tm\
p/Python-2.6.2/./Include -Ibuild/temp.linux-x86_64-2.6/libffi/include  
-Ibuild/t\
emp.linux-x86_64-2.6/libffi -I/home/shr/khinsen/tmp/Python-2.6.2/ 
Modules/_ctype\
s/libffi/src -I. -IInclude -I./Include -I/usr/local/include -I/home/ 
shr/khinsen\
/tmp/Python-2.6.2/Include -I/home/shr/khinsen/tmp/Python-2.6.2 -c / 
home/shr/khi\
nsen/tmp/Python-2.6.2/Modules/_ctypes/libffi/src/x86/ffi64.c -o build/ 
temp.linu\
x-x86_64-2.6/home/shr/khinsen/tmp/Python-2.6.2/Modules/_ctypes/libffi/ 
src/x86/f\
fi64.o
/home/shr/khinsen/tmp/Python-2.6.2/Modules/_ctypes/libffi/src/x86/ 
ffi64.c(43): \
error: identifier "__int128_t" is undefined
     __int128_t sse[MAX_SSE_REGS];
     ^
compilation aborted for /home/shr/khinsen/tmp/Python-2.6.2/Modules/ 
_ctypes/libf\
fi/src/x86/ffi64.c (code 2)


and failed test:

test test_cmath failed -- Traceback (most recent call last):
   File "/home/shr/khinsen/tmp/Python-2.6.2/Lib/test/test_cmath.py",  
line 366, i\
n test_specific_values
     self.fail(error_message)
AssertionError: acos0000: acos(complex(0.0, 0.0))
Expected: complex(1.5707963267948966, -0.0)
Received: complex(1.5707963267948966, 0.0)
Received value insufficiently close to expected value.


Adding optimization yields even more failed tests. My configuration  
options are:

	configure --prefix=$HOME CC=icc CXX=icc OPT=-O0

Did anyone encounter these problems before? Any solutions?

Thanks,
   Konrad.


From deets at nospam.web.de  Tue May 26 08:46:39 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 26 May 2009 14:46:39 +0200
Subject: DB-API execute params, am I missing something?
References: <mailman.745.1243338813.8015.python-list@python.org>
Message-ID: <7826h5F1kcp57U1@mid.uni-berlin.de>

Gabriel Rossetti wrote:

> Hello everyone, I am trying to use dbapi with mysql and I get this error:
> 
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "<stdin>", line 2, in getUnitParams
>   File "/var/lib/python-support/python2.5/MySQLdb/cursors.py", line 151,
> in execute
>     query = query % db.literal(args)
> TypeError: int argument required
> 
> with this code :
> 
> import MySQLdb
> 
> def getParams(curs):
>     curs.execute("select * from param where id=%d", 1001)
>     return curs.fetchall()
> 
> cp = MySQLdb.connect(host="localhost",
>                      port=3306,
>                      user="root",
>                      passwd="123",
>                      db="test")
> 
> curs = cp.cursor()
> result = getParams(curs)
> 
> I checked MySQLdb.paramstyle and it uses "format". I also tried passing
> (1001,) instead of just 1001 as the param but this changes nothing. What
> am I doing wrong?

AFAIK you need to use %s, regardless of what type you pass.

Diez


From python.list at tim.thechases.com  Tue May 26 08:58:34 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 26 May 2009 07:58:34 -0500
Subject: which database is suitable for small applications
In-Reply-To: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
Message-ID: <4A1BE77A.6030606@tim.thechases.com>

>           can any one suggest me which database I can use for my small
> application(to store user names ,passwords, very few other data.. )
> I am using Python, Google Apps and guide me how to connect to database, I am
> very new to these technologies

Well, depending on the complexity you need, you can use either 
the standard  "anydbm" module for simple, persistent key-value 
string-to-string mappings; or you can use the "sqlite3" module 
for a more full-fledged SQL experience with a local data-store. 
If you need to step up to a shared database, you can investigate 
the various MySQL, PostgreSQL, etc. bindings that can be added to 
Python.

You can read about both the "anydbm" and "sqlite3" modules (along 
with example code) in the standard library reference docs.

-tkc





From james at agentultra.com  Tue May 26 09:04:08 2009
From: james at agentultra.com (J Kenneth King)
Date: Tue, 26 May 2009 09:04:08 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <85d49wf22f.fsf@agentultra.com>

Lacrima <Lacrima.Maxim at gmail.com> writes:

> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

That is a slightly better question.

Try some of the free alternatives.  I do happen to use emacs.  It took
me quite a lot of adjusting to get used to it after being a vim user
for almost ten years.  Doesn't cost anything to give one a shot and
see if it works for you.  The choice of editor is a personal one
(hence the reluctance to answer your original question).


From ken at seehart.com  Tue May 26 09:14:34 2009
From: ken at seehart.com (Ken Seehart)
Date: Tue, 26 May 2009 06:14:34 -0700
Subject: What is the difference between init and enter?
In-Reply-To: <7823bvF1k6ml9U1@mid.uni-berlin.de>
References: <gvgkiv$61t$1@aioe.org> <7823bvF1k6ml9U1@mid.uni-berlin.de>
Message-ID: <4A1BEB3A.9080302@seehart.com>

Diez B. Roggisch wrote:
> John wrote:
>
>   
>> I'm okay with init, but it seems to me that enter is redundant since it
>> appears that anything you want to execute in enter can be done in init.
>>     
>
> About what are you talking? 
>
> Diez
>   
Presumably, the 'with' statement.  http://www.python.org/dev/peps/pep-0343/

    *__enter__*(self)

    Enter the runtime context related to this object. The *with*
    <http://effbot.org/pyref/with.htm> statement will bind this method's
    return value to the target(s) specified in the *as*
    <http://effbot.org/pyref/as.htm> clause of the statement, if any.


Unlike __init__,  __enter__ can return a value, which is assigned to the 
variable (or tuple) following the 'as' keyword:

        with EXPR as VAR:
            BLOCK

Also, the object used in a with statement can be constructed prior to 
the with statement.  The __init__ method is called when the object is 
initialized, but the __enter__ method is called when the context is 
entered (i.e. when the 'with' statement is invoked).

Ken

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From james at agentultra.com  Tue May 26 09:16:35 2009
From: james at agentultra.com (J Kenneth King)
Date: Tue, 26 May 2009 09:16:35 -0400
Subject: which database is suitable for small applications
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
	<mailman.744.1243333471.8015.python-list@python.org>
Message-ID: <853aasf1ho.fsf@agentultra.com>

Jean-Michel Pichavant <jeanmichel at sequans.com> writes:

> Kalyan Chakravarthy wrote:
>> Hi All,
>>           can any one suggest me which database I can use for my
>> small application(to store user names ,passwords, very few other
>> data.. )
>> I am using Python, Google Apps and guide me how to connect to
>> database, I am very new to these technologies
>>
>> Please help me
>>
>> Thanks in advance
>>
>> -- 
>> Regards
>> Kalyan
>>
> If you are really new to these technologies and don't want to spend
> some time on it, just serialize on the disk your data structure
> containing your names, password and so on
> (http://docs.python.org/library/pickle.html).
> Depending on your application you may not be that concerned with
> security/reliability issues.
>
> Of course if you want to learn more about it, go on. I personally use
> postgreSQL with the pgdb python module. But this is the only one I
> ever used so I'll let someone else more familiar with all the database
> types respond to you.
>
> Jean-Michel

sqlite is also a pretty lite database. Sits in a single file and the
libraries ship with Python (> 2.6 I think? or maybe 2.5?).

Serialization is always a neat option. With a hash table DB like
berkeley or some such you can get a pretty speedy (albeit simple)
persistence layer.

Really depends on what your app needs.


From roy at panix.com  Tue May 26 09:22:29 2009
From: roy at panix.com (Roy Smith)
Date: Tue, 26 May 2009 09:22:29 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
Message-ID: <roy-92C5E8.09222926052009@news.panix.com>

In article <mailman.741.1243325683.8015.python-list at python.org>,
 "Hendrik van Rooyen" <mail at microcorp.co.za> wrote:

> [syntax coloring] makes your screen look more busy as you type - for instance, if you
> type a " or a ' then it treats the rest of the file from that point on as 
> belonging to the same string you are about to start typing, and colours it
> all using the colour you have selected for displaying string literals.
> This is basically to make you seasick and to force you to type the closing
> quote immediately 

Good syntax coloring implementations have some hysteresis built in, to 
prevent transient things (like strings you haven't closed yet) from 
changing the entire file.  If you stop typing for a while, it then does a 
full update.  This avoids the problem above.

That being said, syntax coloring is like any other tool.  It's worth 
trying, but if you find it hinders you more than it helps, turn it off.  
Different strokes for different folks.

My pet peeve is syntax-aware editors which get things wrong.  For example, 
the version of emacs I'm using now doesn't parse this properly:

'''A triple-quoted string.  Some editors won't get this right'''

The solution is to change the outer quotes to double-quotes, but it annoys 
me when I have to change my code to appease a tool.


From lie.1296 at gmail.com  Tue May 26 09:23:43 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 26 May 2009 13:23:43 GMT
Subject: What is the difference between init and enter?
In-Reply-To: <7823bvF1k6ml9U1@mid.uni-berlin.de>
References: <gvgkiv$61t$1@aioe.org> <7823bvF1k6ml9U1@mid.uni-berlin.de>
Message-ID: <z3SSl.13783$y61.2066@news-server.bigpond.net.au>

Diez B. Roggisch wrote:
> John wrote:
> 
>> I'm okay with init, but it seems to me that enter is redundant since it
>> appears that anything you want to execute in enter can be done in init.
> 
> About what are you talking? 
> 
> Diez

Do you mean __init__ and __enter__?

They are used for two completely different purpose. __init__ is used to 
initialize an object when they've just been created. __enter__ is called 
when an object enters a Context Manager (i.e. with statement)

Example, when opening a file:

# this calls file.__init__
f = open('foo.bar')

# some codes...

# this calls file.__enter__
with f:
     pass



From jeanmichel at sequans.com  Tue May 26 09:25:04 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 26 May 2009 15:25:04 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <4A1BEDB0.6000100@sequans.com>

Why buy an IDE when you just need a text editor ? I don't get it.
Anyway gvim (aka vim aka vi) and emacs are the most powerful editors for 
years. Both have Windows and Linux version and most important, they both 
are very effective at editing any file type (python, C, latex, love 
letters...)
Emacs is more accessible to the newby but requires time to master its 
complex features.
Gvim may be complex for the newby due to its command/insertion mode 
constant switch, but is as powerful as emacs can be. Being a gvim adept, 
I should stat that gvim is far better but it would only feed the 
neverending war.

Jean-Michel


Lacrima wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?
>   



From ken at seehart.com  Tue May 26 09:34:27 2009
From: ken at seehart.com (Ken Seehart)
Date: Tue, 26 May 2009 06:34:27 -0700
Subject: What text editor is everyone using for Python
In-Reply-To: <9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <4A1BEFE3.10500@seehart.com>

Lacrima wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?
>   
It's my favorite.  Buy it.  I'm not aware of any better choices.

If you can afford the Pro version buy that, especially if you are 
planning any large projects.  But take a peek at the feature list before 
making that decision: http://www.wingware.com/wingide/features .  Some 
of my favorite Pro features are test suite support, advanced debugging, 
and code folding.  The debugger is way more powerful in the Pro version.

Of course, favorites are ultimately determined by religious preference.

Ken



From Scott.Daniels at Acm.Org  Tue May 26 09:35:51 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 26 May 2009 06:35:51 -0700
Subject: Regarding sort()
In-Reply-To: <mailman.711.1243244643.8015.python-list@python.org>
References: <de8b174b0905250029g7270aa22t355b60cd31cef3d7@mail.gmail.com>	<97a8f1a70905250051o44266248k2f8c35c017fbf638@mail.gmail.com>	<50697b2c0905250115kb3bd9abq662c09ecd29763cb@mail.gmail.com>
	<mailman.711.1243244643.8015.python-list@python.org>
Message-ID: <AO6dna4bRIVDc4bXnZ2dnUVZ_t-dnZ2d@pdx.net>

Jaime Fernandez del Rio wrote:
>... the reasons are starting to pile to fare 2.6 goodbye and move on to 3.0...
If you wait just a bit (TM)*, you'd be better served to move on to
3.1.  I think 3.0 is for learning, both for Python developers and
users, and has less "fit and polish" than previous Python releases.
Between 2.x and 3.0, there were huge changes, and some substantial
restructuring.  The move to Unicode strings was not without its
bumps and bruises, and efficiency was (quite properly) by no means
the top priority.  As a result, "normal" file I/O on 3.0 is slowed,
and getting that fixed was not a priority (as correctness was plenty
of work).

I'd view 3.0 as the first real-world view of Python 3000, and 3.1 as
getting the surprise burs and sharp edges of 3.0 cleaned up a bit.


* 3.1 is already in beta, according to PEP 375, the first release
   candidate is coming 30-May, with final release on 27-June:
       http://python.org/dev/peps/pep-0375

--Scott David Daniels
Scott.Daniels at Acm.Org


From kyosohma at gmail.com  Tue May 26 09:40:48 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 26 May 2009 06:40:48 -0700 (PDT)
Subject: which database is suitable for small applications
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com> 
	<mailman.744.1243333471.8015.python-list@python.org>
	<853aasf1ho.fsf@agentultra.com>
Message-ID: <cd7541b4-cbd9-47a0-b81b-37b84fe23e58@o30g2000vbc.googlegroups.com>

On May 26, 8:16?am, J Kenneth King <ja... at agentultra.com> wrote:
> Jean-Michel Pichavant <jeanmic... at sequans.com> writes:
> > Kalyan Chakravarthy wrote:
> >> Hi All,
> >> ? ? ? ? ? can any one suggest me which database I can use for my
> >> small application(to store user names ,passwords, very few other
> >> data.. )
> >> I am using Python, Google Apps and guide me how to connect to
> >> database, I am very new to these technologies
>
> >> Please help me
>
> >> Thanks in advance
>
> >> --
> >> Regards
> >> Kalyan
>
> > If you are really new to these technologies and don't want to spend
> > some time on it, just serialize on the disk your data structure
> > containing your names, password and so on
> > (http://docs.python.org/library/pickle.html).
> > Depending on your application you may not be that concerned with
> > security/reliability issues.
>
> > Of course if you want to learn more about it, go on. I personally use
> > postgreSQL with the pgdb python module. But this is the only one I
> > ever used so I'll let someone else more familiar with all the database
> > types respond to you.
>
> > Jean-Michel
>
> sqlite is also a pretty lite database. Sits in a single file and the
> libraries ship with Python (> 2.6 I think? or maybe 2.5?).
>

Sqlite starting shipping with Python 2.5.

I use SqlAlchemy to connect to Microsoft SQL 2000 right now, but I
used to use the mssql and adodb modules. The latter two worked for
what I needed, although I was always running to escaping issues with
them. SqlAlchemy is nice because it does all that for you and you can
switch database back-ends with little to no change in your code.

- Mike


From mwilson at the-wire.com  Tue May 26 09:43:00 2009
From: mwilson at the-wire.com (Mel)
Date: Tue, 26 May 2009 09:43 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <gvgrl2$15je$1@services.telesweet.net>

LittleGrasshopper wrote:

> With so many choices, I was wondering what editor is the one you
> prefer when coding Python, and why. I normally use vi, and just got
> into Python, so I am looking for suitable syntax files for it, and
> extra utilities. I dabbled with emacs at some point, but couldn't get
> through the key bindings for commands. I've never tried emacs with vi
> keybindings (I forgot the name of it) but I've been tempted.
> 
> So what do you guys use, and why? Hopefully we can keep this civil.
 SciTE
I like one big uncomplicated window, tabbed file panes, syntax coloring and 
help with indentation.  There's nothing to it I hate.  It would be nice if 
customization were easier.

	Mel.




From thushianthan15 at gmail.com  Tue May 26 09:48:06 2009
From: thushianthan15 at gmail.com (thushianthan15 at gmail.com)
Date: Tue, 26 May 2009 06:48:06 -0700 (PDT)
Subject: Network programming ?
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
	<a4ec6a83-7624-4529-ba1d-09b137376b78@k2g2000yql.googlegroups.com>
Message-ID: <dad7d795-9b32-4261-acdf-7b8a70c7f07d@r34g2000vbi.googlegroups.com>

Thank you, for all your support.

I will try wxPython with the sockets module.

thushanthan.


From arnodel at googlemail.com  Tue May 26 09:58:36 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 26 May 2009 14:58:36 +0100
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<gvgk6s$bpr$1@lust.ihug.co.nz>
Message-ID: <m2d49w2cfn.fsf@googlemail.com>

Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> writes:

> In message <mailman.741.1243325683.8015.python-list at python.org>, Hendrik van 
> Rooyen wrote:
>
>> "Lawrence D'Oliveiro" <ldo at geek....new_zealand> wrote:
>>> 
>>> Why [do you want syntax highlighting]?
>> 
>> It makes your screen look more busy as you type - for instance, if you
>> type a " or a ' then it treats the rest of the file from that point on as
>> belonging to the same string you are about to start typing, and colours it
>> all using the colour you have selected for displaying string literals.
>> This is basically to make you seasick and to force you to type the closing
>> quote immediately and then to back arrow to inside the string again to
>> finish typing the string, thereby making sure that firstly you type more
>> keystrokes, which will look good on your productivity summary, and
>> secondly to save the Python parser the hassle of dealing with a string
>> that has no end quote.
>
> Yeah, that's about what I figured. I think I first came across it 15 years 
> ago in Metrowerks CodeWarrior. I tried it for a while, but it didn't really 
> help with any of my program bugs, so I turned it off.

It's a bit like the colour-coding of electrical cables - distracting
more than anything else!  And don't start me on traffic lights...  They
nearly give me an epileptic fit each time.

That's why I use ed.  Ed is the standard text editor [1].  Ed is open
source [2].

[1] http://www.gnu.org/fun/jokes/ed.msg
[2] http://www.gnu.org/fun/jokes/ed

-- 
Arnaud


From karthik167 at gmail.com  Tue May 26 10:18:04 2009
From: karthik167 at gmail.com (karthik167 at gmail.com)
Date: Tue, 26 May 2009 07:18:04 -0700 (PDT)
Subject: large array in a single line
Message-ID: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>

I would like to have a txt file of single line with
[1 2 3 .........100]

I try something like
q=arange(100)
fl=file('tmp.ext','w')
fl.writelines(str(q))
fl.close()

Unfortunately my output is

[ 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22
23 24
 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
48 49
 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
73 74
 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
98 99]

ie there is automatic split in line after 76 characters. How do I
avoid it? Thanks.


From Scott.Daniels at Acm.Org  Tue May 26 10:20:33 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 26 May 2009 07:20:33 -0700
Subject: How to create a list of functions depending on a parameter?
In-Reply-To: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
Message-ID: <PqGdnTAVar7FZIbXnZ2dnUVZ_jGdnZ2d@pdx.net>

enzo michelangeli wrote:
> Let's suppose I want to create a list of n functions of a single
> argument, returning the sum between argument and index in the list, so
> that e.g.:
> 
> f[0](10) will return 10
> f[3](12) will return 15
> 
> ...and so on. I had naively though of coding:
> 
>  f = [lambda x: x+j for j in range(n)]

OK, first, almost a joke (unless you really need what you say):
     f = [j.__add__ for j in range(n)]

And now the one various others are missing:

     def add(x, y):
         '''replace with the function you actually want'''
         return x + y

     f = [functools.partial(add, n) for n in range(0)]

--Scott David Daniels
Scott.Daniels at Acm.Org


From arnodel at googlemail.com  Tue May 26 10:26:12 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 26 May 2009 15:26:12 +0100
Subject: large array in a single line
References: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
Message-ID: <m28wkk2b5n.fsf@googlemail.com>

karthik167 at gmail.com writes:

> I would like to have a txt file of single line with
> [1 2 3 .........100]
>
> I try something like
> q=arange(100)
> fl=file('tmp.ext','w')
> fl.writelines(str(q))
> fl.close()
>
> Unfortunately my output is
>
> [ 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22
> 23 24
>  25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
> 48 49
>  50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
> 73 74
>  75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
> 98 99]
>
> ie there is automatic split in line after 76 characters. How do I
> avoid it? Thanks.

You need to tell us more about the arange() function you use and what
object it returns.

-- 
Arnaud


From gherron at islandtraining.com  Tue May 26 10:48:27 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Tue, 26 May 2009 07:48:27 -0700
Subject: What is the difference between init and enter?
In-Reply-To: <gvgkiv$61t$1@aioe.org>
References: <gvgkiv$61t$1@aioe.org>
Message-ID: <4A1C013B.7060605@islandtraining.com>

John wrote:
> I'm okay with init, but it seems to me that enter is redundant since 
> it appears that anything you want to execute in enter can be done in 
> init.

The proper response to a question like this has to be
    http://www.catb.org/~esr/faqs/smart-questions.html
as anything else is complete guesswork.



Gary Herron



From matt at tplus1.com  Tue May 26 10:49:29 2009
From: matt at tplus1.com (Matthew Wilson)
Date: Tue, 26 May 2009 14:49:29 GMT
Subject: How to test python snippets in my documents?
Message-ID: <ZjTSl.34029$ZP4.2476@nlpi067.nbdc.sbc.com>

I'm using a homemade script to verify some code samples in my
documentation.  Here it is:

    #! /usr/bin/env python2.6

    # vim: set expandtab ts=4 sw=4 filetype=python:

    import doctest, os, sys

    def main(s):
        "Run doctest.testfile(s, None)"

        return doctest.testfile(s, None)

    if __name__ == "__main__":
        for x in sys.argv[1:]:
            print "testing code excerpts in %s..." % x
            print main(x)


The script checks all the files listed as arguments.  This is OK, but is
there anything better?



From dr.mtarver at ukonline.co.uk  Tue May 26 10:52:44 2009
From: dr.mtarver at ukonline.co.uk (Mark Tarver)
Date: Tue, 26 May 2009 07:52:44 -0700 (PDT)
Subject: scripting and uploading in Python
Message-ID: <3c1f0711-8da8-4610-bf8e-679eff0facf9@21g2000vbk.googlegroups.com>

I've recently purchased a site on a Linux server which runs Python.

Generally I'd like to bring myself up to speed on scripting in
Python.   Any good reads - dead tree or otherwise?

One thing I need to learn is to be able to give folks the power to
upload files onto their own disk space using passwords.

thanks

Mark


From dns4 at cornell.edu  Tue May 26 10:53:51 2009
From: dns4 at cornell.edu (David Smith)
Date: Tue, 26 May 2009 10:53:51 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <gvgvpu$mmq$1@ruby.cit.cornell.edu>

Lacrima wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?


I use Wing IDE and like it.  It very nicely enforces consistent space
indentations and other Python basics that might fall through the cracks
when writing.  I'm not too hot on the auto-suggest, but I haven't seen
any other IDE do better.

--David


From ken at seehart.com  Tue May 26 11:01:36 2009
From: ken at seehart.com (Ken Seehart)
Date: Tue, 26 May 2009 08:01:36 -0700
Subject: large array in a single line
In-Reply-To: <m28wkk2b5n.fsf@googlemail.com>
References: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
	<m28wkk2b5n.fsf@googlemail.com>
Message-ID: <4A1C0450.6040905@seehart.com>

Arnaud Delobelle wrote:
> karthik167 at gmail.com writes:
>
>   
>> I would like to have a txt file of single line with
>> [1 2 3 .........100]
>>
>> I try something like
>> q=arange(100)
>> fl=file('tmp.ext','w')
>> fl.writelines(str(q))
>> fl.close()
>>
>> Unfortunately my output is
>>
>> [ 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22
>> 23 24
>>  25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
>> 48 49
>>  50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
>> 73 74
>>  75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
>> 98 99]
>>
>> ie there is automatic split in line after 76 characters. How do I
>> avoid it? Thanks.
>>     
>
> You need to tell us more about the arange() function you use and what
> object it returns.
>   

That would be *numpy.arange

*Since numpy has it's own idea about formatting, you would have to roll 
your own.

How about:

    q=arange(100)
    *s = '[' + ' '.join([`x` for x in q]) + ']'*
    fl=file('tmp.ext','w')
    fl.*write*(s)
    fl.close()
      

See: http://docs.python.org/tutorial/datastructures.html#list-comprehensions

Incidentally, it's a funny thing that* writelines *coincidentally does 
what you expect it to do when given a string.  I suspect that you need 
to read the documentation on* writelines*:

file.writelines(/sequence/)
    Write a sequence of strings to the file. The sequence can be any
    iterable object producing strings, typically a list of strings.
    There is no return value. (The name is intended to match
    readlines(); writelines() does not add line separators.)

So you are asking it to effectively concatenate the characters in your 
string, (which gives you back your original string), and write the 
result.  Simply using* write *instead would be more efficient in this case.

Ken

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From lie.1296 at gmail.com  Tue May 26 11:01:58 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 26 May 2009 15:01:58 GMT
Subject: How to test python snippets in my documents?
In-Reply-To: <ZjTSl.34029$ZP4.2476@nlpi067.nbdc.sbc.com>
References: <ZjTSl.34029$ZP4.2476@nlpi067.nbdc.sbc.com>
Message-ID: <GvTSl.13794$y61.1116@news-server.bigpond.net.au>

Matthew Wilson wrote:
> I'm using a homemade script to verify some code samples in my
> documentation.  Here it is:
> 
>     #! /usr/bin/env python2.6
> 
>     # vim: set expandtab ts=4 sw=4 filetype=python:
> 
>     import doctest, os, sys
> 
>     def main(s):
>         "Run doctest.testfile(s, None)"
> 
>         return doctest.testfile(s, None)
> 
>     if __name__ == "__main__":
>         for x in sys.argv[1:]:
>             print "testing code excerpts in %s..." % x
>             print main(x)
> 
> 
> The script checks all the files listed as arguments.  This is OK, but is
> there anything better?
> 

maybe glob.glob('*.py')?


From zamnedix at gmail.com  Tue May 26 11:10:18 2009
From: zamnedix at gmail.com (Zamnedix)
Date: Tue, 26 May 2009 08:10:18 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
Message-ID: <1a4efed3-e308-4f11-95c2-8209fd186ab0@c7g2000prc.googlegroups.com>

On May 25, 10:35?am, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> With so many choices, I was wondering what editor is the one you
> prefer when coding Python, and why. I normally use vi, and just got
> into Python, so I am looking for suitable syntax files for it, and
> extra utilities. I dabbled with emacs at some point, but couldn't get
> through the key bindings for commands. I've never tried emacs with vi
> keybindings (I forgot the name of it) but I've been tempted.
>
> So what do you guys use, and why? Hopefully we can keep this civil.

Nano! Nano! Nano Revolution!!!


From bsk16 at case.edu  Tue May 26 11:11:05 2009
From: bsk16 at case.edu (Benjamin Kaplan)
Date: Tue, 26 May 2009 11:11:05 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <ec96e1390905260811w6fe47836s7a60d0bba00b0560@mail.gmail.com>

On Tue, May 26, 2009 at 8:07 AM, Lacrima <Lacrima.Maxim at gmail.com> wrote:

> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?


We're mostly talking about text editors, not full-fledged IDEs. Those are
actually 3 different pieces of flame bait right there: favorite text editor,
favorite IDE, and text editors vs. IDEs.

>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From Scott.Daniels at Acm.Org  Tue May 26 11:16:47 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 26 May 2009 08:16:47 -0700
Subject: replacement for execfile
In-Reply-To: <mailman.1309.1185723305.22759.python-list@python.org>
References: <mailman.1286.1185635892.22759.python-list@python.org>	<pan.2007.07.29.03.39.34.703168@REMOVE.THIS.cybersource.com.au>
	<mailman.1309.1185723305.22759.python-list@python.org>
Message-ID: <hoydnZ08pJYUm4HXnZ2dnUVZ_r2dnZ2d@pdx.net>

Alex Popescu wrote:
> "Steven D'Aprano" <steve at REMOVE.THIS.cybersource.com.au> wrote in
> news:pan.2007.07.29.03.39.34.703168 at REMOVE.THIS.cybersource.com.au: 
>> ... you're expecting the users to write working Python code, but
>> you think "import module" is too hard for them?
> 
> That was just a cherry on the cake. The most important part is that 
> through this mechanism the user will be able to configure the framework 
> through normal Python code (very simple API: 3 functions), and not 
> through .ini, .xml or other variants.

I think Steven's point is that you can tell the to define a module with,
for example a setup function.  You then import their module and run
their setup function.  They then have a straightforward environment,
and can, for example do straightforward unit tests on their code if
anything even slightly tricky might be wanted as support code.  I agree
with Steven; much nicer to ask them to define a particular module and go
names inside that module.


--Scott David Daniels
Scott.Daniels at Acm.Org


From ken at seehart.com  Tue May 26 11:17:26 2009
From: ken at seehart.com (Ken Seehart)
Date: Tue, 26 May 2009 08:17:26 -0700
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1BEDB0.6000100@sequans.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com>
Message-ID: <4A1C0806.2090802@seehart.com>


Lacrima wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?
>   

Jean-Michel Pichavant wrote:
> Why buy an IDE when you just need a text editor ? I don't get it.
> Anyway gvim (aka vim aka vi) and emacs are the most powerful editors 
> for years. Both have Windows and Linux version and most important, 
> they both are very effective at editing any file type (python, C, 
> latex, love letters...)
> Emacs is more accessible to the newby but requires time to master its 
> complex features.
> Gvim may be complex for the newby due to its command/insertion mode 
> constant switch, but is as powerful as emacs can be. Being a gvim 
> adept, I should stat that gvim is far better but it would only feed 
> the neverending war.
>
> Jean-Michel
>
I've heard notepad is pretty good.  http://www.notepad.org/

:-) Ken




From karthik167 at gmail.com  Tue May 26 11:19:28 2009
From: karthik167 at gmail.com (karthik167 at gmail.com)
Date: Tue, 26 May 2009 08:19:28 -0700 (PDT)
Subject: large array in a single line
References: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
	<m28wkk2b5n.fsf@googlemail.com>
Message-ID: <a6a9f1a9-e9a0-488e-b5c1-f5a1af0a3e73@b7g2000pre.googlegroups.com>

On May 26, 7:26?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
> karthik... at gmail.com writes:
> > I would like to have a txt file of single line with
> > [1 2 3 .........100]
>
> > I try something like
> > q=arange(100)
> > fl=file('tmp.ext','w')
> > fl.writelines(str(q))
> > fl.close()
>
> > Unfortunately my output is
>
> > [ 0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9 10 11 12 13 14 15 16 17 18 19 20 21 22
> > 23 24
> > ?25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
> > 48 49
> > ?50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
> > 73 74
> > ?75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
> > 98 99]
>
> > ie there is automatic split in line after 76 characters. How do I
> > avoid it? Thanks.
>
> You need to tell us more about the arange() function you use and what
> object it returns.
>
> --
> Arnaud

arange(start, stop=None, step=1, typecode=None)

     Just like range() except it returns an array whose type can be
    specified by the keyword argument typecode.


From benjamin.kaplan at case.edu  Tue May 26 11:27:30 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 26 May 2009 11:27:30 -0400
Subject: Network programming ?
In-Reply-To: <4A1BA1B4.70900@ieee.org>
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
	<4A1BA1B4.70900@ieee.org>
Message-ID: <ec96e1390905260827n7bba356ax21bd772b2b119770@mail.gmail.com>

On Tue, May 26, 2009 at 4:00 AM, Dave Angel <davea at ieee.org> wrote:

> thushianthan15 at gmail.com wrote:
>
>> Hi everyone,
>>
>> I am planning to develop a chatting software in Python, for my college
>> project. I am using Windows Vista. Is it possible to do sockets
>> programming in Python ? Any books or websites ?  Also, i want to
>> develop a gui for that program. What are the gui tool kits available
>> for windows? I already knew about PyGtk and PyQT, but will they work
>> properly in Windows platform? Any suggestions?
>>
>> Thank you. Excuse my English.
>>
>>
>>
> You're asking two very distinct questions, and I hope others will chime in,
> especially with the sockets one.
>
> 1)  There is a module called socket, for low level BSD socket access, and
> it does support Windows (plus Mac OSX, BeOS, OS/2, and "all modern Unix"
> No experience with it, however.
>
> 2) There is tkInterf supplied with Python to do GUI development.  However,
> when I studied the choices I knew about, I picked wxPython.  I don't even
> remember the other choices, because it's hard to learn more than one.
>
> see:  http://www.python.org/
> and http://wiki.wxpython.org/
>
> Both totally free, and with very easy (msi) installers for Windows.
>
> Watch out for versions, though.  If you're goin to run wxPython, you want
> to get Python 2.5x or 2.6x, nothing later.  And many say that  wxPython for
>  2.5x is more stable,
> Then when you download wxPython, you need to get the matching version.
>

There was a problem with manifest files in the original Python 2.6 with
wxPython (Python switched to using Visual Studio 2008, wxPython was still
using an older version). I think they have most of the kinks worked out now.


>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From benjamin.kaplan at case.edu  Tue May 26 11:32:29 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 26 May 2009 11:32:29 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1C0806.2090802@seehart.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com> <4A1C0806.2090802@seehart.com>
Message-ID: <ec96e1390905260832i5e5b3942m4ded14eca9b4c66b@mail.gmail.com>

On Tue, May 26, 2009 at 11:17 AM, Ken Seehart <ken at seehart.com> wrote:

>
> Lacrima wrote:
>
>> I am new to python.
>> And now I am using trial version of Wing IDE.
>> But nobody mentioned it as a favourite editor.
>> So should I buy it when trial is expired or there are better choices?
>>
>>
>
> Jean-Michel Pichavant wrote:
>
>> Why buy an IDE when you just need a text editor ? I don't get it.
>> Anyway gvim (aka vim aka vi) and emacs are the most powerful editors for
>> years. Both have Windows and Linux version and most important, they both are
>> very effective at editing any file type (python, C, latex, love letters...)
>> Emacs is more accessible to the newby but requires time to master its
>> complex features.
>> Gvim may be complex for the newby due to its command/insertion mode
>> constant switch, but is as powerful as emacs can be. Being a gvim adept, I
>> should stat that gvim is far better but it would only feed the neverending
>> war.
>>
>> Jean-Michel
>>
>>  I've heard notepad is pretty good.  http://www.notepad.org/
>

But it's not available on any *real* OS. XP

>
> :-) Ken
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From davea at ieee.org  Tue May 26 11:37:34 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 26 May 2009 11:37:34 -0400
Subject: large array in a single line
In-Reply-To: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
References: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
Message-ID: <4A1C0CBE.30706@ieee.org>

karthik167 at gmail.com wrote:
> I would like to have a txt file of single line with
> [1 2 3 .........100]
>
> I try something like
> q=arange(100)
> fl=file('tmp.ext','w')
> fl.writelines(str(q))
> fl.close()
>
> Unfortunately my output is
>
> [ 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22
> 23 24
>  25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
> 48 49
>  50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
> 73 74
>  75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
> 98 99]
>
> ie there is automatic split in line after 76 characters. How do I
> avoid it? Thanks.
>
>   

I never heard of arange(), but perhaps you meant range() or xrange().  
If so, the first problem is that range(100) starts with 0 and ends just 
before 100, so you only get the values 0 to 99.  So if you need the 
final value to be 100, you need to pass it a 101.

Next problem is that you're using str() on a list.  All that does is try 
to give you some printable representation of the list.  You've observed 
it divides it into lines, but that's arbitrary.  If you want the output 
to look a certain way, build it that way.   Use write instead of 
writelines, and put your own \n at the end.

Create a for loop, iterate over the list q, writing each value with a 
trailing space, and follow the loop with one extra write, containing the 
closing brace, and the newline.

Don't forget the leading brace as well.


Sometimes debugging these things can be easier if you temporarily use 
sys.stdout instead of a file, while you're working on it.




From robert.kern at gmail.com  Tue May 26 11:42:15 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 26 May 2009 10:42:15 -0500
Subject: Optimizing math functions
In-Reply-To: <4A1940D3.3000404@hotmail.com>
References: <gv8tbl$ph3$1@ger.gmane.org> <gv9pda$t3s$1@ger.gmane.org>
	<4A1940D3.3000404@hotmail.com>
Message-ID: <gvh2ko$coe$1@ger.gmane.org>

On 2009-05-24 07:42, Esmail wrote:
> Robert Kern wrote:
>>
>>
>> We have several bounded optimization routines in scipy.
>>
>> http://docs.scipy.org/doc/scipy/reference/optimize.html
>
> Hi Robert,
>
> Thanks for the lead .. I briefly looked at the documentation, but
> before I dig into this more deeply 2 quick questions:
>
> 1. Will is also allow me to maximize a function (I only saw minimum)?

Already answered.

> 2. Will it give me the global minima/maxima?

No, they are local optimizers.

> I only ask because I got all excited to see that R has an optimize
> function but unfortunately it can not deal with multi-modal functions.
> I am trying to come up with some complex test cases for a genetic
> algorithm I'm working with, both for functions using f(x) and f(x,y) over a
> variety of intervals so I would like to have a way to verify results for
> more challenging functions.

You may want to consider using artificial functions with known optima. Here is a 
paper from the ACM Transactions on Mathematical Software doing such:

   http://portal.acm.org/citation.cfm?id=962444
   http://wwwinfo.deis.unical.it/~yaro/GKLS.html
   http://www.netlib.org/toms/829

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From barshirtcliff at gmail.com  Tue May 26 11:49:30 2009
From: barshirtcliff at gmail.com (Bar Shirtcliff)
Date: Tue, 26 May 2009 09:49:30 -0600
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1C0806.2090802@seehart.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com> <4A1C0806.2090802@seehart.com>
Message-ID: <18972.3978.978034.217653@bcs.local>

Ken Seehart writes:
| 
| Lacrima wrote:
| > I am new to python.
| > And now I am using trial version of Wing IDE.
| > But nobody mentioned it as a favourite editor.
| > So should I buy it when trial is expired or there are better choices?
| >   
| 

| I've heard notepad is pretty good.  http://www.notepad.org/
| 
| :-) Ken
| 

Seriously.  I actually know a programmer who does all of his work in
notepad: no macros, syntax-highlighting, or any other robust features,
plus that horrible font.

I use emacs.  No alternative presentation rivals, for me, the ability
to program your editor while you use it.  Never having to reach for
the mouse in emacs is a terrific (and optional) bonus.

I guess it depends on how you work.  If you're willing to invest a
fair amount of time in your editor and you like the idea of being able
to drastically modify your editor while you use it, you should
consider emacs.  Emacs has a good on-line help system, including a
friendly emacs lisp introduction.  If you're using a Mac, check out
Aquamacs Emacs.

I can't say a thing about other editors, except that when some shell
script perversely dumped me into vi a month ago, I felt as horrified
as if some actually living bugs had crawled out of my own reflection
on the computer screen and fallen, clicking and scraping, onto the
keyboard.  That's a personal reaction - totally irrelevant, of course.

Bar 



From robert.kern at gmail.com  Tue May 26 11:55:41 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 26 May 2009 10:55:41 -0500
Subject: large array in a single line
In-Reply-To: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
References: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
Message-ID: <gvh3dt$due$1@ger.gmane.org>

On 2009-05-26 09:18, karthik167 at gmail.com wrote:
> I would like to have a txt file of single line with
> [1 2 3 .........100]
>
> I try something like
> q=arange(100)
> fl=file('tmp.ext','w')
> fl.writelines(str(q))
> fl.close()
>
> Unfortunately my output is
>
> [ 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22
> 23 24
>   25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
> 48 49
>   50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
> 73 74
>   75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
> 98 99]
>
> ie there is automatic split in line after 76 characters. How do I
> avoid it? Thanks.

You will want to ask numpy questions on the numpy mailing list:

   http://www.scipy.org/Mailing_Lists

You can control the options for printing numpy arrays via the 
numpy.set_printoptions() function.

 
http://docs.scipy.org/doc/numpy/reference/generated/numpy.set_printoptions.html#numpy.set_printoptions

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From arnodel at googlemail.com  Tue May 26 12:10:02 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 26 May 2009 17:10:02 +0100
Subject: large array in a single line
References: <83210bfc-2e2a-4ca2-b0b9-2d9d232a7f6c@d25g2000prn.googlegroups.com>
	<m28wkk2b5n.fsf@googlemail.com>
	<a6a9f1a9-e9a0-488e-b5c1-f5a1af0a3e73@b7g2000pre.googlegroups.com>
Message-ID: <m24ov73kx1.fsf@googlemail.com>

karthik167 at gmail.com writes:

> On May 26, 7:26?pm, Arnaud Delobelle <arno... at googlemail.com> wrote:
>> karthik... at gmail.com writes:
>> > I would like to have a txt file of single line with
>> > [1 2 3 .........100]
>>
>> > I try something like
>> > q=arange(100)
>> > fl=file('tmp.ext','w')
>> > fl.writelines(str(q))
>> > fl.close()
>>
>> > Unfortunately my output is
>>
>> > [ 0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9 10 11 12 13 14 15 16 17 18 19 20 21 22
>> > 23 24
>> > ?25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
>> > 48 49
>> > ?50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
>> > 73 74
>> > ?75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
>> > 98 99]
>>
>> > ie there is automatic split in line after 76 characters. How do I
>> > avoid it? Thanks.
>>
>> You need to tell us more about the arange() function you use and what
>> object it returns.
>>
>> --
>> Arnaud
>
> arange(start, stop=None, step=1, typecode=None)
>
>      Just like range() except it returns an array whose type can be
>     specified by the keyword argument typecode.

You didn't mention that it is a numpy function!  It returns a
numpy.ndarray object whose __str__() method automatically inserts
newlines to make the output easier to read I guess.

Don't use this, then. You can do for instance:

fl = open('tmp.ext', 'w')
fl.writelines(['[', ' '.join(range(1, 101)), ']'])
fl.close()

(untested)

-- 
Arnaud



From python.list at tim.thechases.com  Tue May 26 12:12:54 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 26 May 2009 11:12:54 -0500
Subject: What text editor is everyone using for Python
In-Reply-To: <1a4efed3-e308-4f11-95c2-8209fd186ab0@c7g2000prc.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<1a4efed3-e308-4f11-95c2-8209fd186ab0@c7g2000prc.googlegroups.com>
Message-ID: <4A1C1506.5060805@tim.thechases.com>

Zamnedix wrote:
>> So what do you guys use, and why? Hopefully we can keep this civil.
> 
> Nano! Nano! Nano Revolution!!!

Thank you, Mork[1] :)

-tkc (who uses Vim for Python coding, and on rare occasions, 
Notepad or ed)

[1]
http://en.wikipedia.org/wiki/Mork_%26_Mindy







From nad at acm.org  Tue May 26 12:38:05 2009
From: nad at acm.org (Ned Deily)
Date: Tue, 26 May 2009 09:38:05 -0700
Subject: How to test python snippets in my documents?
References: <ZjTSl.34029$ZP4.2476@nlpi067.nbdc.sbc.com>
Message-ID: <nad-2B677E.09380526052009@news.gmane.org>

In article <ZjTSl.34029$ZP4.2476 at nlpi067.nbdc.sbc.com>,
 Matthew Wilson <matt at tplus1.com> wrote:
> I'm using a homemade script to verify some code samples in my
> documentation.  [...]
> The script checks all the files listed as arguments.  This is OK, but is
> there anything better?

Perhaps a test-discovery framework, like nose:

http://ivory.idyll.org/articles/nose-intro.html#running-doctests-in-nose

-- 
 Ned Deily,
 nad at acm.org



From mal at egenix.com  Tue May 26 12:42:37 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Tue, 26 May 2009 18:42:37 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A1B9367.7090808@v.loewis.de>
References: <4A107988.3020202@v.loewis.de> <4A1AD862.6090100@egenix.com>
	<4A1B9367.7090808@v.loewis.de>
Message-ID: <4A1C1BFD.8090700@egenix.com>

Martin v. L?wis wrote:
>> Now, with the PEP, I have a feeling that the Python C-API
>> will in effect be limited to what's in the PEP's idea of
>> a usable ABI and open up the non-inluded public C-APIs
>> to the same rate of change as the private APIs.
> 
> That's certainly not the plan. Instead, the plan is to have
> a stable ABI. The policy on the API isn't affected, except
> for restricting changes to the API that would break the ABI.

Thanks for clarifying this.

>>> During the compilation of applications, the preprocessor macro
>>> Py_LIMITED_API must be defined. Doing so will hide all definitions
>>> that are not part of the ABI.
>> So extensions wanting to use the full Python C-API as documented
>> in the C-API docs will still be able to do this, right ?
> 
> Correct. They would link to the version-specific DLL on Windows.

Good.

>>> The structure of type objects is not available to applications;
>>> declaration of "static" type objects is not possible anymore
>>> (for applications using this ABI).
>> Hmm, that's going to create big problems for extensions that
>> want to expose a C-API for their types: Type checks are normally
>> done by pointer comparison using those static type objects.
> 
> I don't see the problem. During module initialization, you
> create the type object and store it in a global variable, and
> then both clients and the module compare against the stored
> pointer.

Ah, good point !

>>> Function-like macros (in particular, field access macros) remain
>>> available to applications, but get replaced by function calls
>>> (unless their definition only refers to features of the ABI, such
>>> as the various _Check macros)
>> Including Py_INCREF()/Py_DECREF() ?
> 
> Yes, although some people are requesting that these become functions.

I'd opt against that, simply because it creates a lot of overhead
due to the function call and issues with cache locality.

>>> Excluded Functions
>>> ------------------
>>>
>>> Functions declared in the following header files are not part
>>> of the ABI:
>>> - cellobject.h
>>> - classobject.h
>>> - code.h
>>> - frameobject.h
>>> - funcobject.h
>>> - genobject.h
>>> - pyarena.h
>>> - pydebug.h
>>> - symtable.h
>>> - token.h
>>> - traceback.h
>> I don't think that's feasable: you basically remove all introspection
>> functions that way.
>>
>> This will need a more fine-grained approach.
> 
> What specifically is it that you want to do in a module that you
> couldn't do anymore?

See my reply to Nick: some of the functions are needed even
if you don't want to do introspection, such as Py_FatalError()
or PyTraceBack_Print().

BTW: Given the headline, I take it that the various type checking
macros in these header will still be available, right ?

>>> On Windows, applications shall link with python3.dll;
>> You mean: extensions that were compiled with Py_LIMITED_API, right ?
> 
> Correct, see "Terminology" in the PEP.

Good, thanks.

>>> an import
>>> library python3.lib will be available. This DLL will redirect all of
>>> its API functions through /export linker options to the full
>>> interpreter DLL, i.e. python3y.dll.
>> What if you mix extensions that use the full C-API with ones
>> that restrict themselves to the limited version ?
> 
> Some link against python3.dll, others against python32.dll (say).
> 
>> Would creating a Python object in a full-API extension and
>> free'ing it in a limited-API extension cause problems ?
> 
> No problem that I can see.

Can we be sure that the MSVCRT used by python35.dll stays compatible
to the one used by say python32.dll ? What if the CRT memory
management changes between MSVCRT versions ?

Another aspect to consider:

How will this work in the light of having multiple copies of
Python installed on a Windows machine ?

They implementation section suggests that python3.dll would always
redirect to the python3x.dll for which it was installed, ie. if
I have Python 3.5 installed, but then need to run some app with
Python 3.2, the installed python3.dll would then point back to the
python32.dll.

Now, if I start a Python 3.5 application which uses a limited
API extension, this would try to load python32.dll into the
Python 3.5 process. AFAIK, that's not possible due to the
naming conflicts.

>>> This PEP will be implemented in a branch, allowing users to check
>>> whether their modules conform to the ABI. To simplify this testing, an
>>> additional macro Py_LIMITED_API_WITH_TYPES will expose the existing
>>> type object layout, to let users postpone rewriting all types. When
>>> the this branch is merged into the 3.2 code base, this macro will
>>> be removed.
>> Now I'm confused again: this sounds a lot like you do want all extension
>> writers to only use the limited API.
> 
> I certainly want to support as many modules as reasonable with the PEP.
> Whether or not developers then chose to build version-independent
> binaries is certainly outside the scope of the PEP - it only specifies
> action items for Python, not for application authors.

Thanks for the clarification.

>>>> Something I haven't seen explicitly mentioned as yet (in the PEP or the
>>>>> python-dev list discussion) are the memory management APIs and the FILE*
>>>>> APIs which can cause the MSVCRT versioning issues on Windows.
>>>>>
>>>>> Those would either need to be excluded from the stable ABI or else
>>>>> changed to use opaque pointers.
>>> Good point. As a separate issue, I would actually like to deprecate,
>>> then remove these APIs. I had originally hoped that this would happen
>>> for 3.0 already, alas, nobody worked on it.
>>>
>>> In any case, I have removed them from the ABI now.
>> How do you expect Python extensions to allocate memory and objects
>> in a platform independent way without those APIs ?
> 
> I have only removed functions from the ABI that have FILE* in their
> signatures.
> 
>> And as an aside: Which API families are you referring to ? PyMem_Malloc,
>> PyObject_Malloc, or PyObject_New ?
> 
> Neither. PyRun_AnyFileFlags and friends.

Good.

Thanks,
-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, May 26 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________
2009-06-29: EuroPython 2009, Birmingham, UK                33 days to go

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From joel.goldstick at columbuswebmakers.com  Tue May 26 12:50:36 2009
From: joel.goldstick at columbuswebmakers.com (Joel Goldstick)
Date: Tue, 26 May 2009 12:50:36 -0400
Subject: test message
Message-ID: <4A1C1DDC.6090101@columbuswebmakers.com>

I'm wondering why I couldn't post here.  I read the email list, not from 
  the newsgroup


From bblais at bryant.edu  Tue May 26 13:12:09 2009
From: bblais at bryant.edu (Brian Blais)
Date: Tue, 26 May 2009 13:12:09 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1C0806.2090802@seehart.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com> <4A1C0806.2090802@seehart.com>
Message-ID: <9F6A6533-D344-439F-806F-5285F4ACCB7E@bryant.edu>

On May 26, 2009, at 11:17 , Ken Seehart wrote:

>
> Lacrima wrote:
>> I am new to python.
>> And now I am using trial version of Wing IDE.
>> But nobody mentioned it as a favourite editor.
>> So should I buy it when trial is expired or there are better choices?
>>
>
> Jean-Michel Pichavant wrote:
>> Why buy an IDE when you just need a text editor ? I don't get it.
>> Anyway gvim (aka vim aka vi) and emacs are the most powerful  
>> editors for years. Both have Windows and Linux version and most  
>> important, they both are very effective at editing any file type  
>> (python, C, latex, love letters...)
>> Emacs is more accessible to the newby but requires time to master  
>> its complex features.
>> Gvim may be complex for the newby due to its command/insertion  
>> mode constant switch, but is as powerful as emacs can be. Being a  
>> gvim adept, I should stat that gvim is far better but it would  
>> only feed the neverending war.
>>
>> Jean-Michel
>>
> I've heard notepad is pretty good.  http://www.notepad.org/
>


I'm sorry, but ed is the standard editor[1].   :)


				bb



[1] http://en.wikipedia.org/wiki/Ed_(text_editor)
>

-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais



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From stugots at qwest.net  Tue May 26 13:12:23 2009
From: stugots at qwest.net (John DeRosa)
Date: Tue, 26 May 2009 10:12:23 -0700
Subject: Ted Dziuba
References: <gvdgut$i3k$1@lust.ihug.co.nz>
Message-ID: <2009052610122375249-stugots@qwestnet>

On 2009-05-25 00:22:04 -0700, Lawrence D'Oliveiro 
<ldo at geek-central.gen.new_zealand> said:

> <http://www.theregister.co.uk/2009/05/25/dziuba_microsoft_php/page2.html>:
> 
>     If you've ever had to build C extensions to Python on Windows, you can
>     join me in a feeling of satisfaction that someone at Microsoft is going
>     to have to figure this out. Let's call it retribution for Internet
>     Explorer 6.

Brilliant. OT, I miss uncov.com. His wit is razor-sharp.



From bblais at bryant.edu  Tue May 26 13:16:30 2009
From: bblais at bryant.edu (Brian Blais)
Date: Tue, 26 May 2009 13:16:30 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <B1FD356B-5611-44DF-8A1F-77712D89B825@bryant.edu>

On May 26, 2009, at 8:07 , Lacrima wrote:

> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

I have found that the appreciation of a text editor varies greatly  
across different people.  What one person swears by, feels clunky to  
another.  On the Mac, I like TextMate because I find it pretty clean  
and fast.  On Windows I've used Notepad++, Emacs, Crimson, and  
possibly a few others.  What I recommend is to try out some of the  
editors in:

http://wiki.python.org/moin/PythonEditors

and see how it works for you.  Depending on what you need, and how  
they "feel", you may find what you want with a free editor.



					bb

-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais



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From randall at tnr.cc  Tue May 26 13:52:22 2009
From: randall at tnr.cc (Randall Smith)
Date: Tue, 26 May 2009 12:52:22 -0500
Subject: multiprocessing / forking memory usage
Message-ID: <gvha8n$7n6$1@ger.gmane.org>

I'm trying to get a grasp on how memory usage is affected when forking 
as the multiprocessing module does.  I've got a program with a parent 
process using wx and other memory intensive modules. It spawns child 
processes (by forking) that should be very lean (no wx required, etc). 
Based on inspection using "ps v" and psutil, the memory usage (rss) is 
much higher than I would expect for the subprocess.

My understanding is that COW is used when forking (on Linux).  So maybe 
"ps v pid" is reflecting that.  If that's the case, is there a way to 
better determine the child's memory usage?  If it's not the case and I'm 
using modules I don't need, how can I reduce the memory usage to what 
the child actually uses instead of including everything the parent is using?

Randall



From icymist at gmail.com  Tue May 26 14:12:00 2009
From: icymist at gmail.com (lone_eagle)
Date: Tue, 26 May 2009 11:12:00 -0700 (PDT)
Subject: Passing string from python programs to external programs
Message-ID: <47463f42-448e-472a-98ad-bced4b278050@g19g2000yql.googlegroups.com>

Hi all,

On Linux, I do something like this

$ program_to_execute < input_file
... get some output ...

I have the content of the input_file as a string inside a python
program and would like to pass this string to the external program
from inside the python program and get back the programs output in a
string/file. Can someone tell me how to achieve this. I have been
through the documentation for Popen, but this one beats me.

Cheers,
Chaitanya


From smukh at cognobytes.com  Tue May 26 14:39:36 2009
From: smukh at cognobytes.com (Sumitava Mukherjee)
Date: Tue, 26 May 2009 11:39:36 -0700 (PDT)
Subject: How do I sample randomly based on some probability(wightage)?
Message-ID: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>

Hi all,
I need to randomly sample from a list where all choices have weights
attached to them. The probability of them being choosen is dependent
on the weights.
If say Sample list of choices are [A,B,C,D,E] and weights of the same
are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
want the likeliness of them being chosen be in the order : D>A>C>E>B

In short I mean if prob of a H is .9 and probability of T be 0.1 then
if I draw 10 samples, 9 should be H and 1 should be T.

I coudn't find a function in the module random that does so.
Please can someone guide me how the above could be implemented [either
through some function which exists and I don't know or pointers to
some code snippets which does so]?


From smukh at cognobytes.com  Tue May 26 14:42:56 2009
From: smukh at cognobytes.com (Sumitava Mukherjee)
Date: Tue, 26 May 2009 11:42:56 -0700 (PDT)
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <c9566044-6e50-42ca-aa02-9ff63206c601@g22g2000pra.googlegroups.com>

On May 26, 11:39?pm, Sumitava Mukherjee <sm... at cognobytes.com> wrote:
> Hi all,
> I need to randomly sample from a list where all choices have weights
> attached to them. The probability of them being choosen is dependent
> on the weights.
> If say Sample list of choices are [A,B,C,D,E] and weights of the same
> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
> want the likeliness of them being chosen be in the order : D>A>C>E>B
>
> In short I mean if prob of a H is .9 and probability of T be 0.1 then
> if I draw 10 samples, 9 should be H and 1 should be T.
>
> I coudn't find a function in the module random that does so.
> Please can someone guide me how the above could be implemented [either
> through some function which exists and I don't know or pointers to
> some code snippets which does so]?

>>>> [Oh, I forgot to mention. I am looking for sampling without replacement.]


From emile at fenx.com  Tue May 26 14:49:43 2009
From: emile at fenx.com (Emile van Sebille)
Date: Tue, 26 May 2009 11:49:43 -0700
Subject: How do I sample randomly based on some probability(wightage)?
In-Reply-To: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <gvhdo4$j0p$1@ger.gmane.org>

On 5/26/2009 11:39 AM Sumitava Mukherjee said...
> Hi all,
> I need to randomly sample from a list where all choices have weights
> attached to them. The probability of them being choosen is dependent
> on the weights.
> If say Sample list of choices are [A,B,C,D,E] and weights of the same
> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
> want the likeliness of them being chosen be in the order : D>A>C>E>B
> 
> In short I mean if prob of a H is .9 and probability of T be 0.1 then
> if I draw 10 samples, 9 should be H and 1 should be T.

I don't know if there's a function for this somewhere, but you can 
easily roll your own...

import random

choices = list('ABCDE')
weights = [0.895,0.567,0.765,0.890,0.60]

selections = list("".join([ choice*int(weight*1000) for choice,weight in 
zip(choices,weights) ]))

random.shuffle(selections)

for randomchoice in selections:
    dosomething(randomchoice)

Emile



> 
> I coudn't find a function in the module random that does so.
> Please can someone guide me how the above could be implemented [either
> through some function which exists and I don't know or pointers to
> some code snippets which does so]?



From martin at v.loewis.de  Tue May 26 14:54:35 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 26 May 2009 20:54:35 +0200
Subject: [Python-Dev] PEP 384: Defining a Stable ABI
In-Reply-To: <4A1C1BFD.8090700@egenix.com>
References: <4A107988.3020202@v.loewis.de> <4A1AD862.6090100@egenix.com>
	<4A1B9367.7090808@v.loewis.de> <4A1C1BFD.8090700@egenix.com>
Message-ID: <4A1C3AEB.7010708@v.loewis.de>

>>>> Functions declared in the following header files are not part
>>>> of the ABI:
>>>> - cellobject.h
>>>> - classobject.h
>>>> - code.h
>>>> - frameobject.h
>>>> - funcobject.h
>>>> - genobject.h
>>>> - pyarena.h
>>>> - pydebug.h
>>>> - symtable.h
>>>> - token.h
>>>> - traceback.h
>>> I don't think that's feasable: you basically remove all introspection
>>> functions that way.
>>>
>>> This will need a more fine-grained approach.
>> What specifically is it that you want to do in a module that you
>> couldn't do anymore?
> 
> See my reply to Nick: some of the functions are needed even
> if you don't want to do introspection, such as Py_FatalError()

Ok. I don't know what Py_FatalError is doing in pydebug.h, so I
now propose to move it to pyerrors.h.

> or PyTraceBack_Print().

Ok; I have removed traceback.h from the list. By the other rules
of the PEP, the only function that becomes available then is
PyTraceBack_Print.

> BTW: Given the headline, I take it that the various type checking
> macros in these header will still be available, right ?

Which headers? The one on the list above? No; my idea would
be to completely hide them as-is.

All other type-checking macros will remain available, and
will remain being macros.

>>> Would creating a Python object in a full-API extension and
>>> free'ing it in a limited-API extension cause problems ?
>> No problem that I can see.
> 
> Can we be sure that the MSVCRT used by python35.dll stays compatible
> to the one used by say python32.dll ? What if the CRT memory
> management changes between MSVCRT versions ?

It doesn't matter. For Python "things", the extension module will
use the pymem.h functions, which get routed through pythonxy.dll
to the CRT that Python was build with.

If the extension uses regular malloc(), it should also invoke
regular free() on the pointer. There is no API where Python
calls malloc directly and the extension calls free, or vice
versa.

> How will this work in the light of having multiple copies of
> Python installed on a Windows machine ?

Interesting question. One solution could be to use SxS, which
would allow multiple concurrent installations of python3.dll,
although we would need to make sure it always binds to the
"right" one in each context.

Another solution could be to keep the various copies of python3.dll
in their respective PYTHONHOMEs, and leave it to python.exe or the
app to load the right one; any subsequent extension modules should
then pick up the one that was already loaded.

> They implementation section suggests that python3.dll would always
> redirect to the python3x.dll for which it was installed, ie. if
> I have Python 3.5 installed, but then need to run some app with
> Python 3.2, the installed python3.dll would then point back to the
> python32.dll.

That depends on where they get installed. If they all go into system32,
only the most recent one would be available, which is probably not
desirable.

> Now, if I start a Python 3.5 application which uses a limited
> API extension, this would try to load python32.dll into the
> Python 3.5 process. AFAIK, that's not possible due to the
> naming conflicts.

I don't see this problem. As long as we manage to install multiple
versions of python3.dll on the system somehow, different processes
could certainly load different such DLLs, and the same extension
module would always use the right one.

Regards,
Martin


From arnodel at googlemail.com  Tue May 26 14:58:02 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 26 May 2009 19:58:02 +0100
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<c9566044-6e50-42ca-aa02-9ff63206c601@g22g2000pra.googlegroups.com>
Message-ID: <m2zlcz1ykl.fsf@googlemail.com>

Sumitava Mukherjee <smukh at cognobytes.com> writes:

> On May 26, 11:39?pm, Sumitava Mukherjee <sm... at cognobytes.com> wrote:
>> Hi all,
>> I need to randomly sample from a list where all choices have weights
>> attached to them. The probability of them being choosen is dependent
>> on the weights.
>> If say Sample list of choices are [A,B,C,D,E] and weights of the same
>> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
>> want the likeliness of them being chosen be in the order : D>A>C>E>B

You mean A > D > C > E > B

>> In short I mean if prob of a H is .9 and probability of T be 0.1 then
>> if I draw 10 samples, 9 should be H and 1 should be T.
>>
>> I coudn't find a function in the module random that does so.
>> Please can someone guide me how the above could be implemented [either
>> through some function which exists and I don't know or pointers to
>> some code snippets which does so]?
>
>>>>> [Oh, I forgot to mention. I am looking for sampling without replacement.]

If you do sampling without replacement, you need to know the exact
number of each of A, B, C, D, E in the sample, not just their relative
frequency.

-- 
Arnaud


From debatem1 at gmail.com  Tue May 26 15:09:10 2009
From: debatem1 at gmail.com (CTO)
Date: Tue, 26 May 2009 12:09:10 -0700 (PDT)
Subject: Passing string from python programs to external programs
References: <47463f42-448e-472a-98ad-bced4b278050@g19g2000yql.googlegroups.com>
Message-ID: <dbcd3a93-82c2-4282-9775-0b901a0fc124@s21g2000vbb.googlegroups.com>

On May 26, 2:12?pm, lone_eagle <icym... at gmail.com> wrote:
> Hi all,
>
> On Linux, I do something like this
>
> $ program_to_execute < input_file
> ... get some output ...
>
> I have the content of the input_file as a string inside a python
> program and would like to pass this string to the external program
> from inside the python program and get back the programs output in a
> string/file. Can someone tell me how to achieve this. I have been
> through the documentation for Popen, but this one beats me.
>
> Cheers,
> Chaitanya

from subprocess import getstatusoutput

cmd = 'echo '
str = 'Hello World!'
status, output = getstatusoutput(cmd + repr(str))

Obviously, this is 3.x. I believe that in 2.x it was in
the commands module.

Geremy Condra


From jeff at jmcneil.net  Tue May 26 15:16:27 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Tue, 26 May 2009 12:16:27 -0700 (PDT)
Subject: Passing string from python programs to external programs
References: <47463f42-448e-472a-98ad-bced4b278050@g19g2000yql.googlegroups.com>
Message-ID: <6853b163-782c-44d0-a4dc-d8d906fe95f1@l28g2000vba.googlegroups.com>

On May 26, 2:12?pm, lone_eagle <icym... at gmail.com> wrote:
> Hi all,
>
> On Linux, I do something like this
>
> $ program_to_execute < input_file
> ... get some output ...
>
> I have the content of the input_file as a string inside a python
> program and would like to pass this string to the external program
> from inside the python program and get back the programs output in a
> string/file. Can someone tell me how to achieve this. I have been
> through the documentation for Popen, but this one beats me.
>
> Cheers,
> Chaitanya

Sounds like subprocess is what you want.  Here's a quick ad-hoc
example. You can find more information on the module at
http://docs.python.org/library/subprocess.html.

[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import subprocess
>>> sub = subprocess.Popen('/bin/gzip', stdin=subprocess.PIPE, stdout=subprocess.PIPE)
>>> g = sub.communicate('Please, sir, gzip me?')
>>> import gzip
>>> import StringIO
>>> gzip.GzipFile(fileobj=StringIO.StringIO(g[0])).read()
'Please, sir, gzip me?'
>>>

Thanks,

Jeff
mcjeff.blogspot.com


From joshua at joshuakugler.com  Tue May 26 15:19:18 2009
From: joshua at joshuakugler.com (Joshua Kugler)
Date: Tue, 26 May 2009 11:19:18 -0800
Subject: Compile python extensions under windows/cygwin
References: <76a31694-de66-4d73-a3b1-2ab8373c1ba0@e24g2000vbe.googlegroups.com>
Message-ID: <gvhfbn$nn9$1@ger.gmane.org>

Joana wrote:

> I mantain Python on Windows, all installed packages are under c:
> \Python25\Lib\site-packages. Now I have to build C libraries used by
> python extensions and I am using cygwin, but I don't know how to
> install the module in Windows directory.

I have used MingW to do this.  Might this help:

http://joshuakugler.com/archives/13-Building-Python-Eggs-with-C-Extensions-on-Windows.html

j



From mwilson at the-wire.com  Tue May 26 15:23:00 2009
From: mwilson at the-wire.com (Mel)
Date: Tue, 26 May 2009 15:23 -0400
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <gvhfie$1mpk$1@services.telesweet.net>

Sumitava Mukherjee wrote:

> Hi all,
> I need to randomly sample from a list where all choices have weights
> attached to them. The probability of them being choosen is dependent
> on the weights.
> If say Sample list of choices are [A,B,C,D,E] and weights of the same
> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
> want the likeliness of them being chosen be in the order : D>A>C>E>B
> 
> In short I mean if prob of a H is .9 and probability of T be 0.1 then
> if I draw 10 samples, 9 should be H and 1 should be T.
> 
> I coudn't find a function in the module random that does so.
> Please can someone guide me how the above could be implemented [either
> through some function which exists and I don't know or pointers to
> some code snippets which does so]?

 I've usually used something like (untested):

def chooser (objects, weights):
    total = 0.0
    for obj, weight in zip (objects, weights):
        total += weight
        if weight < total * random.random():
            chosen = obj
    return chosen

Works fine if runtime is not a great concern.

        Mel.



From george.sakkis at gmail.com  Tue May 26 15:23:10 2009
From: george.sakkis at gmail.com (George Sakkis)
Date: Tue, 26 May 2009 12:23:10 -0700 (PDT)
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <1002ca53-6d60-4c0c-a0d5-54a178a4ebd5@d25g2000prn.googlegroups.com>

On May 26, 2:39?pm, Sumitava Mukherjee <sm... at cognobytes.com> wrote:
> Hi all,
> I need to randomly sample from a list where all choices have weights
> attached to them. The probability of them being choosen is dependent
> on the weights.
> If say Sample list of choices are [A,B,C,D,E] and weights of the same
> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
> want the likeliness of them being chosen be in the order : D>A>C>E>B
>
> In short I mean if prob of a H is .9 and probability of T be 0.1 then
> if I draw 10 samples, 9 should be H and 1 should be T.
>
> I coudn't find a function in the module random that does so.
> Please can someone guide me how the above could be implemented [either
> through some function which exists and I don't know or pointers to
> some code snippets which does so]?

1. Normalize the weights so that they sum up to 1.
2. Form the cumulative sequence S = [0, w0, w0+w1, w0+w1+w2, ..., sum
(w)==1.0]
3. Call random.random() -> x
4. Find the bucket in S that x belongs to, i.e. the i so that s[i] <=
x < s[i+1] (you can do this fast using the bisect module).
5. Return choice[i]
6. Test.
7. Submit homework ;)

HTH,
George


From boris.kazakov at gmail.com  Tue May 26 15:24:42 2009
From: boris.kazakov at gmail.com (=?KOI8-R?B?4s/SydMg68HawcvP1w==?=)
Date: Tue, 26 May 2009 23:24:42 +0400
Subject: Pickle of the instance of new style class fails when execute with 
	exec statement
Message-ID: <681c4a70905261224g6c39c3c0jfa733ab5aaa30e9f@mail.gmail.com>

Hi, I'm trying to execute the following code:

d = {}
exec('import cPickle')  in d
desc = """
class A(object):
    pass
"""
exec(desc) in d

exec('a = A()') in d
exec('cPickle.dump(a, open("tmp.txt","wb"))')in d

for some reason it fails with the following traceback:

Traceback (most recent call last):
  File "pickleTest.py", line 10, in <module>
    exec('cPickle.dump(a, open("tmp.txt","wb"))')in d
  File "<string>", line 1, in <module>
cPickle.PicklingError: Can't pickle <class 'A'>: attribute lookup
__builtin__.A failed

pickle also dosen't work, changing protocol dosen't seem to help.

it works when i do:

exec('import __builtin__') in d
exec('__builtin__.A = A') in d

but it pollutes builtin namespace, which I don't like.

May be there is a workaround, how to do this correctly?
Thanks in advance,
Boris.
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From msolem at linuxmail.org  Tue May 26 15:25:22 2009
From: msolem at linuxmail.org (msolem at linuxmail.org)
Date: Tue, 26 May 2009 12:25:22 -0700 (PDT)
Subject: unpickling a stream
Message-ID: <3efc7aa5-c9b7-4755-bd5f-a4e87518d423@x5g2000yqk.googlegroups.com>

Hello,

I want to send a stream of pickled objects over a socket.  Is there a
standard way of ensuring that only complete objects are unpickled on
the receiving side.

client pseudo code:
  loop forever:
    receive some bytes on the socket
    if we have received a complete pickled object:  <== How is this
done?
      unpickle the object

This isn't for a project, just trying to learn some more about the
pickle module.

Mike


From bearophileHUGS at lycos.com  Tue May 26 15:25:29 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 26 May 2009 12:25:29 -0700 (PDT)
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <defe8aa2-921d-4567-80b4-a13089486c2c@r37g2000yqd.googlegroups.com>

Sumitava Mukherjee:
>I need to randomly sample from a list where all choices have weights attached to them.<

Like this?
http://code.activestate.com/recipes/498229/

Bye,
bearophile


From davea at ieee.org  Tue May 26 16:41:35 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 26 May 2009 16:41:35 -0400
Subject: How do I sample randomly based on some probability(wightage)?
In-Reply-To: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <4A1C53FF.80203@ieee.org>

Sumitava Mukherjee wrote:
> Hi all,
> I need to randomly sample from a list where all choices have weights
> attached to them. The probability of them being choosen is dependent
> on the weights.
> If say Sample list of choices are [A,B,C,D,E] and weights of the same
> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
> want the likeliness of them being chosen be in the order : D>A>C>E>B
>
> In short I mean if prob of a H is .9 and probability of T be 0.1 then
> if I draw 10 samples, 9 should be H and 1 should be T.
>
> I coudn't find a function in the module random that does so.
> Please can someone guide me how the above could be implemented [either
> through some function which exists and I don't know or pointers to
> some code snippets which does so]?
>
>   
Emile gave you a pretty elegant solution, assuming two things:  The 
choices can be represented by a single character each, and a roundoff 
error of one part in a thousand is acceptable.

Of course, you can represent 256 choices in a 2.x character, and you 
could switch to Unicode if that's not enough.  And if 1000 isn't enough, 
you could make it bigger, at the cost of needing a bigger table.

Here's my more-straightforward algorithm, not reduced to code.

Start with a list of probabilities.  Replace each item with the sum of 
all the items up to and including itself.  (If you do it in-place, you'd 
need to do it in reverse order, but if you use a copy, you could simply 
replace each item with a sum() of the appropriate slice of the copy.


Anyway, now you've got a list of cumulative probabilites, with the last 
item equalling 1.0 (pretty close).  You might need to fudge that to 
exactly 1.0, just in case.

I think I'd zip that list with the original list of items, so that you 
have a single list of tuples.

Now to generate a random sample, call  random.random() to get a value 
between 0 and 1. Search the list for the first item greater than or 
equal to your value, and return the other half of the tuple.




From rNOSPAMon at flownet.com  Tue May 26 17:10:05 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Tue, 26 May 2009 14:10:05 -0700
Subject: distutils extension configuration problem
Message-ID: <rNOSPAMon-6DE857.14100426052009@news.gha.chartermi.net>

I'm trying to build PyObjC on an Intel Mac running OS X 10.5.7.  The 
build is breaking because distutils seems to want to build extension 
modules as universal binaries, but some of the libraries it depends on 
are built for intel-only, i.e.:

[ron at mickey:~/Desktop/pyobjc-framework-ScreenSaver-2.2b2]$ python2.6 
setup.py build
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/distutils
/dist.py:266: UserWarning: Unknown distribution option: 'options'
  warnings.warn(msg)
running build
running build_py
running build_ext
building 'ScreenSaver._inlines' extension
gcc -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -g 
-bundle -undefined dynamic_lookup 
build/temp.macosx-10.3-i386-2.6/Modules/_ScreenSaver_inlines.o -o 
build/lib.macosx-10.3-i386-2.6/ScreenSaver/_inlines.so -framework 
ScreenSaver
ld: in /Developer/SDKs/MacOSX10.4u.sdk/usr/local/lib/libTIFF.dylib, file 
is not of required architecture for architecture ppc
collect2: ld returned 1 exit status
lipo: can't open input file: 
/var/folders/nT/nTiypn-v2RatkU+BYncrKU+++TI/-Tmp-//ccMFYRkt.out (No such 
file or directory)
error: command 'gcc' failed with exit status 1

[ron at mickey:~/Desktop/pyobjc-framework-ScreenSaver-2.2b2]$ file 
build/temp.macosx-10.3-i386-2.6/Modules/_ScreenSaver_inlines.o 
build/temp.macosx-10.3-i386-2.6/Modules/_ScreenSaver_inlines.o: Mach-O 
universal binary with 2 architectures
build/temp.macosx-10.3-i386-2.6/Modules/_ScreenSaver_inlines.o (for 
architecture ppc): Mach-O object ppc
build/temp.macosx-10.3-i386-2.6/Modules/_ScreenSaver_inlines.o (for 
architecture i386):   Mach-O object i386

[ron at mickey:~/Desktop/pyobjc-framework-ScreenSaver-2.2b2]$ file 
/usr/local/lib/libtiff.dylib 
/usr/local/lib/libtiff.dylib: Mach-O dynamically linked shared library 
i386

How do I get distutils to stop trying to build extensions as universal 
binaries?

Thanks,
rg


From piet at cs.uu.nl  Tue May 26 17:14:37 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Tue, 26 May 2009 23:14:37 +0200
Subject: multiprocessing / forking memory usage
References: <mailman.771.1243360355.8015.python-list@python.org>
Message-ID: <m2octf5zya.fsf@cs.uu.nl>

>>>>> Randall Smith <randall at tnr.cc> (RS) wrote:

>RS> I'm trying to get a grasp on how memory usage is affected when forking as
>RS> the multiprocessing module does.  I've got a program with a parent process
>RS> using wx and other memory intensive modules. It spawns child processes (by
>RS> forking) that should be very lean (no wx required, etc). Based on
>RS> inspection using "ps v" and psutil, the memory usage (rss) is much higher
>RS> than I would expect for the subprocess.

The child is a clone of the parent. So both its virtual memory usage and
its resident memory usage will be equal to the parent's ones immediately
after the fork(). But the actual physical memory has only one copy
resident, although ps will show it on both processes (at least I think
that's how ps works). Of course later they will diverge.

>RS> My understanding is that COW is used when forking (on Linux).  

I think this is true of all modern Unix systems.

>RS> So maybe "ps v pid" is reflecting that. If that's the case, is
>RS> there a way to better determine the child's memory usage?
 
Define `memory usage' in the light of the above.

As long as the parent is still around and you don't run out of virtual
memory in the child, not much harm is done.

If the parent stops and you don't run out of virtual memory in the
child, the excessive pages will eventually be paged out, and then no
longer occupy physical memory. As long as you have enough swap space it
shouldn't be a big problem. The extra paging activity is a bit of a
loss, however.

If you run out of virtual memory in the child you have a problem, however.

>RS> If it's not the case and I'm using
>RS> modules I don't need, how can I reduce the memory usage to what the child
>RS> actually uses instead of including everything the parent is using?

The best would be to fork the child before you import the excess modules
in the parent. If that is not possible you could try to delete as much
in the child as you can, for example by
del wx; del sys.modules['wx'] etc, delete all variables that you don't
need, and hope the garbage collector will clean up enough. But it will
make you application quite complicated. From the python level you can't
get rid of loaded shared libraries, however. And trying to do that from
the C level is probably close to committing suicide.

My advise: don't worry until you really experience memory problems.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From icymist at gmail.com  Tue May 26 17:16:11 2009
From: icymist at gmail.com (psykeedelik)
Date: Tue, 26 May 2009 14:16:11 -0700 (PDT)
Subject: Passing string from python programs to external programs
References: <47463f42-448e-472a-98ad-bced4b278050@g19g2000yql.googlegroups.com>
	<6853b163-782c-44d0-a4dc-d8d906fe95f1@l28g2000vba.googlegroups.com>
Message-ID: <17053796-d6d3-473c-9652-bc404ead5ead@k2g2000yql.googlegroups.com>

On May 26, 9:16?pm, Jeff McNeil <j... at jmcneil.net> wrote:
> On May 26, 2:12?pm, lone_eagle <icym... at gmail.com> wrote:
>
> > Hi all,
>
> > On Linux, I do something like this
>
> > $ program_to_execute < input_file
> > ... get some output ...
>
> > I have the content of the input_file as a string inside a python
> > program and would like to pass this string to the external program
> > from inside the python program and get back the programs output in a
> > string/file. Can someone tell me how to achieve this. I have been
> > through the documentation for Popen, but this one beats me.
>
> > Cheers,
> > Chaitanya
>
> Sounds like subprocess is what you want. ?Here's a quick ad-hoc
> example. You can find more information on the module athttp://docs.python.org/library/subprocess.html.
>
> [GCC 4.3.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> import subprocess
> >>> sub = subprocess.Popen('/bin/gzip', stdin=subprocess.PIPE, stdout=subprocess.PIPE)
> >>> g = sub.communicate('Please, sir, gzip me?')
> >>> import gzip
> >>> import StringIO
> >>> gzip.GzipFile(fileobj=StringIO.StringIO(g[0])).read()
>
> 'Please, sir, gzip me?'
>
>
>
> Thanks,
>
> Jeff
> mcjeff.blogspot.com

Thanks guys!! Problem solved!!


From davea at ieee.org  Tue May 26 17:36:01 2009
From: davea at ieee.org (Dave Angel)
Date: Tue, 26 May 2009 17:36:01 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <B1FD356B-5611-44DF-8A1F-77712D89B825@bryant.edu>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<B1FD356B-5611-44DF-8A1F-77712D89B825@bryant.edu>
Message-ID: <4A1C60C1.70402@ieee.org>

Lacrima wrote:
>> I am new to python.
>> And now I am using trial version of Wing IDE.
>> But nobody mentioned it as a favourite editor.
>> So should I buy it when trial is expired or there are better choices?
>
I'm a little surprised nobody has explicitly mentioned Komodo IDE (the 
full version).  Although it's not free, it has plenty of useful 
features, is very configurable, supports Python and a host of other 
languages, and is a full IDE with an out-of-process debugger.  This 
means you can step through GUI code, without it interfering with the 
debugger's event loop.

You can customize it in four ways:
  1) through Edit->Preferences
  2) through recorded macros
  3) through macros written in Javascript
  4) through macros written in Python


A subset of Komodo IDE is available as Komodo Edit, which is open source.

Apparently Komodo is developed from some of the same code base as 
Firefox, so they can be integrated more tightly when debugging internet 
stuff.  I haven't tried anything of the sort, so
 I can't say how well this works, and for what.



From bjracine at glosten.com  Tue May 26 17:59:08 2009
From: bjracine at glosten.com (Benjamin J. Racine)
Date: Tue, 26 May 2009 14:59:08 -0700
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1C60C1.70402@ieee.org>
Message-ID: <B5B90D0DBF4EDC46892E8FD3602BA92A19C68946@clipper.glosten.local>

I use Textmate (with vim keybindings) on OS X or just vim on the others OS's.

I still can't decide on which IDE between Wing, PyDev and Netbeans.

Ben Racine



 

-----Original Message-----
From: python-list-bounces+bjracine=glosten.com at python.org [mailto:python-list-bounces+bjracine=glosten.com at python.org] On Behalf Of Dave Angel
Sent: Tuesday, May 26, 2009 2:36 PM
Cc: python-list at python.org; Lacrima
Subject: Re: What text editor is everyone using for Python

Lacrima wrote:
>> I am new to python.
>> And now I am using trial version of Wing IDE.
>> But nobody mentioned it as a favourite editor.
>> So should I buy it when trial is expired or there are better choices?
>
I'm a little surprised nobody has explicitly mentioned Komodo IDE (the full version).  Although it's not free, it has plenty of useful features, is very configurable, supports Python and a host of other languages, and is a full IDE with an out-of-process debugger.  This means you can step through GUI code, without it interfering with the debugger's event loop.

You can customize it in four ways:
  1) through Edit->Preferences
  2) through recorded macros
  3) through macros written in Javascript
  4) through macros written in Python


A subset of Komodo IDE is available as Komodo Edit, which is open source.

Apparently Komodo is developed from some of the same code base as Firefox, so they can be integrated more tightly when debugging internet stuff.  I haven't tried anything of the sort, so  I can't say how well this works, and for what.

--
http://mail.python.org/mailman/listinfo/python-list


From david at boddie.org.uk  Tue May 26 18:28:54 2009
From: david at boddie.org.uk (David Boddie)
Date: Wed, 27 May 2009 00:28:54 +0200
Subject: any lib to extract pages form pdf and then merge?
References: <mailman.735.1243313253.8015.python-list@python.org>
Message-ID: <gvhqf6$poq$1@get-news01.get.basefarm.net>

On Tuesday 26 May 2009 06:47, oyster wrote:

> I want to extract some pages from vary pdf files, then write them
> with/witout rotation into one new pdf file. something likes this

[...]

> I have tried pypdf, but it errs and exits on some of my pdfs(no, the
> files have no password)

Maybe you could get in touch with the author to try and work around these
problems.

David


From ldo at geek-central.gen.new_zealand  Tue May 26 19:33:51 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 11:33:51 +1200
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
	<gvb8kn$7gm$2@lust.ihug.co.nz>
	<mailman.674.1243192904.8015.python-list@python.org>
	<gvd6c0$bqs$1@lust.ihug.co.nz>
	<pan.2009.05.25.05.22.14@REMOVE.THIS.cybersource.com.au>
Message-ID: <gvhu8v$4ff$1@lust.ihug.co.nz>

In message <pan.2009.05.25.05.22.14 at REMOVE.THIS.cybersource.com.au>, Steven 
D'Aprano wrote:

> On Sun, 24 May 2009 22:47:51 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
> 
>> .. Gregory Chaitin among others has been trying to rework physics to get
>> rid of real numbers altogether.
> 
> (1/2) If you "get rid of real numbers", then obviously you must have a
> smaller set of numbers, not a larger.

Chaitin is trying to use only computable numbers. Pi is computable, as is e, 
sqrt(2), the Feigenbaum constant, and many others familiar to us all.

Trouble is, they only make up 0% of the reals. It's the other 100% he wants 
to get rid of.



From roy at panix.com  Tue May 26 19:51:54 2009
From: roy at panix.com (Roy Smith)
Date: Tue, 26 May 2009 19:51:54 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<gvgk6s$bpr$1@lust.ihug.co.nz> <m2d49w2cfn.fsf@googlemail.com>
Message-ID: <roy-AEB753.19515326052009@news.panix.com>

In article <m2d49w2cfn.fsf at googlemail.com>,
 Arnaud Delobelle <arnodel at googlemail.com> wrote:

> That's why I use ed.  Ed is the standard text editor [1].  Ed is open
> source [2].

I still use ed sometimes.  If I'm on a box which doesn't have emacs 
installed (or using something whose terminal emulation is totally broken), 
it lets me get work done.


From roy at panix.com  Tue May 26 19:58:51 2009
From: roy at panix.com (Roy Smith)
Date: Tue, 26 May 2009 19:58:51 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com> <4A1C0806.2090802@seehart.com>
	<mailman.764.1243352981.8015.python-list@python.org>
Message-ID: <roy-97FE62.19585126052009@news.panix.com>

In article <mailman.764.1243352981.8015.python-list at python.org>,
 Bar Shirtcliff <barshirtcliff at gmail.com> wrote:

> I can't say a thing about other editors, except that when some shell
> script perversely dumped me into vi a month ago, I felt as horrified
> as if some actually living bugs had crawled out of my own reflection
> on the computer screen and fallen, clicking and scraping, onto the
> keyboard.  That's a personal reaction - totally irrelevant, of course.

<esc> : q ! <return>

All the vi you ever need to know :-)

The real problem is when you get dumped into some editor other than you one 
you expected and don't realize it for a while.  It's really amazing how 
much damage you can do to a file by typing (for example) emacs commands at 
vi.  Especially if you accidentally stumble upon the sequence for "save 
file".


From rhodri at wildebst.demon.co.uk  Tue May 26 20:44:25 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 27 May 2009 01:44:25 +0100
Subject: What text editor is everyone using for Python
In-Reply-To: <roy-92C5E8.09222926052009@news.panix.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
Message-ID: <op.uukccbg3a8ncjz@gnudebst>

On Tue, 26 May 2009 14:22:29 +0100, Roy Smith <roy at panix.com> wrote:

> My pet peeve is syntax-aware editors which get things wrong.  For  
> example,
> the version of emacs I'm using now doesn't parse this properly:
>
> '''A triple-quoted string.  Some editors won't get this right'''
>
> The solution is to change the outer quotes to double-quotes, but it  
> annoys me when I have to change my code to appease a tool.

It's the separate python-mode that gets this (and much else) wrong.
The Python mode that Ubuntu packages with emacs 22.2.1 works just
fine.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From pavlovevidence at gmail.com  Tue May 26 21:26:17 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 26 May 2009 18:26:17 -0700 (PDT)
Subject: How to ask smart questions question
References: <gvgkiv$61t$1@aioe.org>
	<mailman.756.1243349312.8015.python-list@python.org>
Message-ID: <960af9f3-c445-4d6d-b277-76a123ee4dcd@s28g2000vbp.googlegroups.com>

On May 26, 7:48?am, Gary Herron <gher... at islandtraining.com> wrote:
> John wrote:
> > I'm okay with init, but it seems to me that enter is redundant since
> > it appears that anything you want to execute in enter can be done in
> > init.
>
> The proper response to a question like this has to be
> ? ?http://www.catb.org/~esr/faqs/smart-questions.html
> as anything else is complete guesswork.

Is there a Cliff's Notes version of this?

I may be a cynic but I would think the people who ask bad questions
are the same sort of people who won't have the patience to sit though
this behemoth of an essay.

And I may be a romantic but I would think most people who post this
are really trying to be helpful and not just saying, "Out of my midst,
vile newbie, until thou hearkenst unto the sacred words".

So, it would seem that a summary (with citations) of the essay would
be useful.


Carl Banks


From martin.hellwig at dcuktec.org  Tue May 26 21:54:36 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Wed, 27 May 2009 02:54:36 +0100
Subject: How to ask smart questions question
In-Reply-To: <960af9f3-c445-4d6d-b277-76a123ee4dcd@s28g2000vbp.googlegroups.com>
References: <gvgkiv$61t$1@aioe.org>
	<mailman.756.1243349312.8015.python-list@python.org>
	<960af9f3-c445-4d6d-b277-76a123ee4dcd@s28g2000vbp.googlegroups.com>
Message-ID: <Y-CdnfLqgsbBAIHXnZ2dnUVZ8judnZ2d@bt.com>

Carl Banks wrote:
> On May 26, 7:48 am, Gary Herron <gher... at islandtraining.com> wrote:
>> John wrote:
>>> I'm okay with init, but it seems to me that enter is redundant since
>>> it appears that anything you want to execute in enter can be done in
>>> init.
>> The proper response to a question like this has to be
>>    http://www.catb.org/~esr/faqs/smart-questions.html
>> as anything else is complete guesswork.
> 
> Is there a Cliff's Notes version of this?
> 
> I may be a cynic but I would think the people who ask bad questions
> are the same sort of people who won't have the patience to sit though
> this behemoth of an essay.
> 
> And I may be a romantic but I would think most people who post this
> are really trying to be helpful and not just saying, "Out of my midst,
> vile newbie, until thou hearkenst unto the sacred words".
> 
> So, it would seem that a summary (with citations) of the essay would
> be useful.
> 
> 
> Carl Banks

I can do a quick one albeit without citation:

- Have you googled/searched?
- No really, have you?
- Are you really, really sure?

- So what did you 'search for|tried before' which didn't returned a 
result you can work with?
- What does that tell you about yourself?
- So what do _you_ think _you_ should do first to solve _your_ problem?

- Okay, fair enough, tell me your problem, give me some background, give 
me some examples, skip the waffling, be polite I am here out of my own 
good will.

A: See you haven't searched properly | Hmm intriguing | Seems like a 
bug, contact the author

-- 
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'


From roy at panix.com  Tue May 26 21:57:49 2009
From: roy at panix.com (Roy Smith)
Date: Tue, 26 May 2009 21:57:49 -0400
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
Message-ID: <roy-0546BC.21574826052009@news.panix.com>

In article <mailman.782.1243385070.8015.python-list at python.org>,
 "Rhodri James" <rhodri at wildebst.demon.co.uk> wrote:

> On Tue, 26 May 2009 14:22:29 +0100, Roy Smith <roy at panix.com> wrote:
> 
> > My pet peeve is syntax-aware editors which get things wrong.  For  
> > example,
> > the version of emacs I'm using now doesn't parse this properly:
> >
> > '''A triple-quoted string.  Some editors won't get this right'''
> >
> > The solution is to change the outer quotes to double-quotes, but it  
> > annoys me when I have to change my code to appease a tool.
> 
> It's the separate python-mode that gets this (and much else) wrong.
> The Python mode that Ubuntu packages with emacs 22.2.1 works just
> fine.

Cool.  I'll see if I can snarf that and use it instead.


From martin.hellwig at dcuktec.org  Tue May 26 22:03:08 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Wed, 27 May 2009 03:03:08 +0100
Subject: How to ask smart questions question
In-Reply-To: <Y-CdnfLqgsbBAIHXnZ2dnUVZ8judnZ2d@bt.com>
References: <gvgkiv$61t$1@aioe.org>
	<mailman.756.1243349312.8015.python-list@python.org>
	<960af9f3-c445-4d6d-b277-76a123ee4dcd@s28g2000vbp.googlegroups.com>
	<Y-CdnfLqgsbBAIHXnZ2dnUVZ8judnZ2d@bt.com>
Message-ID: <2P-dnXP5FqPAAoHXnZ2dnUVZ8hGdnZ2d@bt.com>

Martin P. Hellwig wrote:
<cut see previous>
> I can do a quick one albeit without citation:
> 
> - Have you googled/searched?
> - No really, have you?
> - Are you really, really sure?
> 
> - So what did you 'search for|tried before' which didn't returned a 
> result you can work with?
> - What does that tell you about yourself?
> - So what do _you_ think _you_ should do first to solve _your_ problem?
> 
> - Okay, fair enough, tell me your problem, give me some background, give 
> me some examples, skip the waffling, be polite I am here out of my own 
> good will.
> 
> A: See you haven't searched properly | Hmm intriguing | Seems like a 
> bug, contact the author
> 

Oh I forgot:
- Be complete, don't forget essential things
- Write simple sentences, I don't want to guess the meaning of your epistle
- Use a spell checker
- It doesn't hurt to reread before hitting the send button

-- 
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'


From tiskanto at gmail.com  Tue May 26 22:46:21 2009
From: tiskanto at gmail.com (Teguh Iskanto)
Date: Wed, 27 May 2009 12:46:21 +1000
Subject: How does Python's OOP feel?
Message-ID: <e137e8260905261946q5666c240m516b28d841c9970@mail.gmail.com>

Ikon wrote:
>I'm rather new to Python. I have PHP for my main language and I do
>some Java. They all have a very strict OO schema. As I red through
>Python's tutorial it seams it has nothing of those rules. No statical,
>abstract classes, functions, or variables.
>
>I wish someone, who has experience in both Java/PHP/C# and Python
>would tell me how mush better/worse is it to program in a language
>that misses most of the OO parts!
>

Here's a view from a seasonal programmer :

My day job is mostly doing some networking/security stuffs,
I only do programmings only if I had to (like creating
tools/automation/etc) or if no one in my network team was able/didn't
want to do it :(
Just a couple months back we had an engineering issue and we needed to
create/design a robust broker system that works in a background.
This system would take orders from different systems in a form of XML
and should be able to 'talk' to cluster firewalls (range in hundreds
of firewalls) and should be able to add/remove/check/verify/edit
objects on the individual firewall.

Knowing the complexity of the problem and the time constraint that we
had (my manager gave me 2.5 months to get this thing to work) , I had
no other resolution other than turning my self into python. At first I
was a bit doubtful but I kept moving on esp knowing that running a big
and complex project with perl would be like 'digging my own graveyard'
(especially in terms of modularity & maintenance ).

As it turned out, I enjoyed doing big projects with python especially
with its OOP style : simple & really easy --without having to go into
too much OOP details or bogged down with OOP theory-- it just works !
and  it's as easy as if you're running a 'plug & play' module and
playing LEGO. Long story short, I was able to present the whole system
in time and the system is now being used in production for a mission
critical F/W deployment ( I've used pyexpect,XML and Threading to
speed up the process )

The good thing about python is : it 'tastes' like what it was being
advertised (eg: Makes things easy and makes complex problem possible )
and I agree 100% with that. If a seasonal programmer like me find it
easy, then it should be much easier for you.

BTW: Before this project, I've programmed in C/PHP/Perl/Tcl but never
had a chance to really try Python in a full-blown OOP complex project.
HTH


From yhtan at values1.com  Tue May 26 22:50:26 2009
From: yhtan at values1.com (Tan, Yih Hung)
Date: Wed, 27 May 2009 10:50:26 +0800
Subject: Question in VB DLL COM event in Delphi Programming
Message-ID: <200905270250.n4R2oQTZ019353@pp-proxy01.tm.net.my>

Dear Sir,

I have a question regarding Delphi COM programming. I have a VB DLL (ActiveX
COM DLL) and this DLL contain 2 classes, one is for normal client function
calling, and the other one is events raised by this DLL to notify the
client. Now, I would like to incorporate this DLL into Delphi (bind the DLL
into Delphi program) so that when the events raised by this DLL,  it can be
capture in the Delphi program. I am new in Delphi and I would like to need
your help or advice on this integration. I could send you the sample code in
VB and the VB DLL if you need. Thanks in advance.

 

Best regards,

Tan, Yih Hung

 

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From ldo at geek-central.gen.new_zealand  Tue May 26 23:17:40 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 15:17:40 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<gvgk6s$bpr$1@lust.ihug.co.nz> <m2d49w2cfn.fsf@googlemail.com>
Message-ID: <gvibck$bsq$1@lust.ihug.co.nz>

In message <m2d49w2cfn.fsf at googlemail.com>, Arnaud Delobelle wrote:

> That's why I use ed.

After 20 years of suffering with vi, I finally decided to switch to Emacs. 
Yes, it has lots of fancy features and "modes" and things, but it wasn't 
hard to figure out how to turn the intrusive stuff off, and still leave a 
very powerful and useful editor.



From ldo at geek-central.gen.new_zealand  Tue May 26 23:20:58 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 15:20:58 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<mailman.752.1243344314.8015.python-list@python.org>
Message-ID: <gvibiq$bsq$2@lust.ihug.co.nz>

In message <mailman.752.1243344314.8015.python-list at python.org>, Jean-Michel 
Pichavant wrote:

> Why buy an IDE when you just need a text editor ?

Because all the cool kids have one. If you want to be different and 
individual like them, you have to have what they have.



From ldo at geek-central.gen.new_zealand  Tue May 26 23:23:29 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 15:23:29 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com> <4A1C0806.2090802@seehart.com>
	<mailman.764.1243352981.8015.python-list@python.org>
	<roy-97FE62.19585126052009@news.panix.com>
Message-ID: <gvibnh$bsq$3@lust.ihug.co.nz>

In message <roy-97FE62.19585126052009 at news.panix.com>, Roy Smith wrote:

> The real problem is when you get dumped into some editor other than you
> one you expected and don't realize it for a while.  It's really amazing
> how much damage you can do to a file by typing (for example) emacs
> commands at vi.

Doesn't work the other way round, though. All you'll likely succeed in doing 
is putting the vi commands into the file.

This, ladies and gentlemen of the jury, points up the essential difference 
between a modal and a non-modal way of doing things.



From gallium.arsenide at gmail.com  Tue May 26 23:25:15 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Tue, 26 May 2009 20:25:15 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
Message-ID: <0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>

On May 26, 9:43?am, Mel <mwil... at the-wire.com> wrote:

> ?SciTE
> I like one big uncomplicated window, tabbed file panes,
> syntax coloring and help with indentation. ?There's
> nothing to it I hate. ?It would be nice if
> customization were easier.

This is a decent summary of SciTE, but I kind of marvel at how few
people complain about its Python indentation.  (I'd like to think it's
because anyone who edits Python code in SciTE has downloaded my patch,
but I am confident that is not the case.)

John


From steven at REMOVE.THIS.cybersource.com.au  Tue May 26 23:43:39 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 27 May 2009 03:43:39 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.535.1242945935.8015.python-list@python.org>
	<1f9ec7a0-dd36-4c7d-bf62-fb1df643356b@n7g2000prc.googlegroups.com>
	<7b986ef0-d118-4e0c-afef-3c6385a4c6e6@b7g2000pre.googlegroups.com>
	<gvb8kn$7gm$2@lust.ihug.co.nz>
	<mailman.674.1243192904.8015.python-list@python.org>
	<gvd6c0$bqs$1@lust.ihug.co.nz>
	<pan.2009.05.25.05.22.14@REMOVE.THIS.cybersource.com.au>
	<gvhu8v$4ff$1@lust.ihug.co.nz>
Message-ID: <pan.2009.05.27.03.43.38@REMOVE.THIS.cybersource.com.au>

On Wed, 27 May 2009 11:33:51 +1200, Lawrence D'Oliveiro wrote:

> Chaitin is trying to use only computable numbers. Pi is computable, as
> is e, sqrt(2), the Feigenbaum constant, and many others familiar to us
> all.
> 
> Trouble is, they only make up 0% of the reals. It's the other 100% he
> wants to get rid of.


+1 QOTD


-- 
Steven


From mr.ankitavasthi at gmail.com  Wed May 27 00:48:53 2009
From: mr.ankitavasthi at gmail.com (Ankit)
Date: Tue, 26 May 2009 21:48:53 -0700 (PDT)
Subject: which database is suitable for small applications
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com> 
	<mailman.744.1243333471.8015.python-list@python.org>
Message-ID: <52801358-c037-458d-8857-a78c2d881ddb@z16g2000prd.googlegroups.com>

Hi Kalyan...

If your application does not require you to add very heavy data then
you can also use flat files to do your stuff.
Its always a better to use Databases but given your low level use and
newness to python... i would advise you to take up flat files instead.

store your data there and access it.. simple!

ANkit


From mr.ankitavasthi at gmail.com  Wed May 27 00:56:06 2009
From: mr.ankitavasthi at gmail.com (Ankit)
Date: Tue, 26 May 2009 21:56:06 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<85d49wf22f.fsf@agentultra.com>
Message-ID: <762354ae-1d82-4a1f-aa49-eabd8f9a0173@f37g2000pro.googlegroups.com>

On May 26, 6:04?pm, J Kenneth King <ja... at agentultra.com> wrote:
> Lacrima <Lacrima.Ma... at gmail.com> writes:
> > I am new to python.
> > And now I am using trial version of Wing IDE.
> > But nobody mentioned it as a favourite editor.
> > So should I buy it when trial is expired or there are better choices?
>

I will suggest u to use TEXTPAD 4 on windows and
Emacs or Vi or RocketEdit on your Linux machine



From jaime.frio at gmail.com  Wed May 27 01:10:05 2009
From: jaime.frio at gmail.com (Jaime Fernandez del Rio)
Date: Wed, 27 May 2009 07:10:05 +0200
Subject: How do I sample randomly based on some probability(wightage)?
In-Reply-To: <c9566044-6e50-42ca-aa02-9ff63206c601@g22g2000pra.googlegroups.com>
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<c9566044-6e50-42ca-aa02-9ff63206c601@g22g2000pra.googlegroups.com>
Message-ID: <97a8f1a70905262210m6e846b0ci1fd7465d2864a06c@mail.gmail.com>

On Tue, May 26, 2009 at 8:42 PM, Sumitava Mukherjee
<smukh at cognobytes.com> wrote:
> On May 26, 11:39?pm, Sumitava Mukherjee <sm... at cognobytes.com> wrote:
>
>>>>> [Oh, I forgot to mention. I am looking for sampling without replacement.]

That means that, you'll have to code something that updates the sums
of probabilities after each extraction...

Would there be a smart way of doing this, of just adding the whole
updated list again is the best, or at least good enough?

-- 
(\__/)
( O.o)
( > <) Este es Conejo. Copia a Conejo en tu firma y ay?dale en sus
planes de dominaci?n mundial.


From tiskanto at gmail.com  Wed May 27 01:29:40 2009
From: tiskanto at gmail.com (Teguh Iskanto)
Date: Wed, 27 May 2009 15:29:40 +1000
Subject: What text editor is everyone using for Python
In-Reply-To: <762354ae-1d82-4a1f-aa49-eabd8f9a0173@f37g2000pro.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<85d49wf22f.fsf@agentultra.com>
	<762354ae-1d82-4a1f-aa49-eabd8f9a0173@f37g2000pro.googlegroups.com>
Message-ID: <e137e8260905262229r17755adax7003df44b8954eda@mail.gmail.com>

Have you tried vim ? it has got tons of tons of features, like ( just
to name a few)  : file manager, color syntax, tab screen,
command/syntax completion (cache only) , vertical split, horizontal
split, colorful diffing, create a patch, etc .. you name it  !! .
There's also plugins / script that people share @
http://www.vim.org/scripts/index.php. Also Vim comes in Windows/Unix
version :)

IMO, you don't even need an IDE, if you combined vim + "screen" ( man
screen ) as both are really powerful tools
for example: you're working in the office and connected to your remote
CVS server, with "screen" you can lock the screen with password &
detach it. once you're @ home and want to continue to work , you just
need to log in to that cvs server again and do "screen -r" and voila
your session is still there :)

BTW: "screen" does split screen too :)

HTH




On Wed, May 27, 2009 at 2:56 PM, Ankit <mr.ankitavasthi at gmail.com> wrote:
> On May 26, 6:04?pm, J Kenneth King <ja... at agentultra.com> wrote:
>> Lacrima <Lacrima.Ma... at gmail.com> writes:
>> > I am new to python.
>> > And now I am using trial version of Wing IDE.
>> > But nobody mentioned it as a favourite editor.
>> > So should I buy it when trial is expired or there are better choices?
>>
>
> I will suggest u to use TEXTPAD 4 on windows and
> Emacs or Vi or RocketEdit on your Linux machine
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From ldo at geek-central.gen.new_zealand  Wed May 27 01:52:07 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 17:52:07 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<85d49wf22f.fsf@agentultra.com>
	<762354ae-1d82-4a1f-aa49-eabd8f9a0173@f37g2000pro.googlegroups.com>
	<mailman.786.1243402183.8015.python-list@python.org>
Message-ID: <gvike7$h38$1@lust.ihug.co.nz>

In message <mailman.786.1243402183.8015.python-list at python.org>, Teguh 
Iskanto wrote:

> Have you tried vim ? it has got tons of tons of features ...

So has everything else these days.

> for example: you're working in the office and connected to your remote
> CVS server ...

Wouldn't it be easier to use a distributed VCS?



From paul.nospam at rudin.co.uk  Wed May 27 01:54:37 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Wed, 27 May 2009 06:54:37 +0100
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<mailman.752.1243344314.8015.python-list@python.org>
	<gvibiq$bsq$2@lust.ihug.co.nz>
Message-ID: <87ws835bvm.fsf@rudin.co.uk>

Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> writes:

> In message <mailman.752.1243344314.8015.python-list at python.org>, Jean-Michel 
> Pichavant wrote:
>
>> Why buy an IDE when you just need a text editor ?
>
> Because all the cool kids have one. If you want to be different and 
> individual like them, you have to have what they have.

Of course it's not always clear what the difference is in any
case. Emacs, for example, has most of the features of many IDEs (not to
mention many features that they lack).


From ldo at geek-central.gen.new_zealand  Wed May 27 01:55:38 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 17:55:38 +1200
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
	<gvd1id$8jj$2@lust.ihug.co.nz>
	<roy-50FE2E.07273725052009@news.panix.com>
Message-ID: <gvikkq$h38$2@lust.ihug.co.nz>

In message <roy-50FE2E.07273725052009 at news.panix.com>, Roy Smith wrote:

> In article <gvd1id$8jj$2 at lust.ihug.co.nz>,
>  Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
> 
>> In message <roy-3C4DED.09214724052009 at news.panix.com>, Roy Smith wrote:
>> 
>> > In article <gvb8fn$7gm$1 at lust.ihug.co.nz>,
>> >  Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
>> > 
>> >> The right thing to do is try to ensure that all your connections are
>> >> properly closed at shutdown. That may not be enough (if your server
>> >> crashes due to bugs), so the other thing you need to do is retry the
>> >> socket open, say, at 30-second intervals, until it succeeds.
>> > 
>> > That may be a reasonable thing to do for production code, but when
>> > you're building and debugging a server, it's a real pain to not be able
>> > to restart it quickly whenever you want (or need) to.
>> 
>> On the contrary, I run exactly the same logic--and that includes socket-
>> handling logic--in both test and production servers. How else can I be
>> sure it'll work properly in production?
> 
> I was just pointing out how it can be useful in cases such as the OP's,
> where he's getting bind errors when he restarts his server.

And I was pointing out how important it was to make sure your code deals 
gracefully with those errors.



From ben+python at benfinney.id.au  Wed May 27 02:41:08 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 27 May 2009 16:41:08 +1000
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<pan.2009.05.26.05.01.13@REMOVE.THIS.cybersource.com.au>
	<mailman.738.1243324787.8015.python-list@python.org>
	<pan.2009.05.26.08.56.03@REMOVE.THIS.cybersource.com.au>
Message-ID: <87my8zxd2z.fsf@benfinney.id.au>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:

> nano is basically an updated (forked?) version of pico.

Re-implemented <URL:http://www.nano-editor.org/dist/v1.2/faq.html#6>.
Pico was under a non-free license, so Nano was written to be a
feature-compatible free-software clone.

-- 
 \     ?If you ever catch on fire, try to avoid seeing yourself in the |
  `\        mirror, because I bet that's what REALLY throws you into a |
_o__)                                             panic.? ?Jack Handey |
Ben Finney


From ben+python at benfinney.id.au  Wed May 27 02:44:51 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 27 May 2009 16:44:51 +1000
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <87iqjnxcws.fsf@benfinney.id.au>

Lacrima <Lacrima.Maxim at gmail.com> writes:

> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

I think your time will be better spent learning a powerful, mature,
well-supported, free-software, programmable editor with support for an
enormous range of text processing tasks.

Either of Vim or Emacs qualify. Language-specific IDEs do not.

-- 
 \             ?Ladies are requested not to have children in the bar.? |
  `\                                          ?cocktail lounge, Norway |
_o__)                                                                  |
Ben Finney


From ben+python at benfinney.id.au  Wed May 27 03:07:25 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 27 May 2009 17:07:25 +1000
Subject: How to ask smart questions question
References: <gvgkiv$61t$1@aioe.org>
	<mailman.756.1243349312.8015.python-list@python.org>
	<960af9f3-c445-4d6d-b277-76a123ee4dcd@s28g2000vbp.googlegroups.com>
Message-ID: <87eiubxbv6.fsf@benfinney.id.au>

Carl Banks <pavlovevidence at gmail.com> writes:

> On May 26, 7:48?am, Gary Herron <gher... at islandtraining.com> wrote:
> > The proper response to a question like this has to be ?
> > ?http://www.catb.org/~esr/faqs/smart-questions.html as anything else
> > is complete guesswork.
> 
> Is there a Cliff's Notes version of this?
> 
> I may be a cynic but I would think the people who ask bad questions
> are the same sort of people who won't have the patience to sit though
> this behemoth of an essay.

To the extent that's the case, then it benefits the community as a
filter, by making it easier to detect those who aren't going to read a
good essay on how to participate in a community of question-answerers.

On the other hand, I prefer to give questioners the benefit of the doubt
by not discounting the possibility that they *can* read and learn how to
improve the quality of their questions.

> And I may be a romantic but I would think most people who post this
> are really trying to be helpful and not just saying, "Out of my midst,
> vile newbie, until thou hearkenst unto the sacred words".

Posting a reference to the ?asking questions the smart way? essay is,
at least most of the times I've seen it, an explicit effort to be
helpful to the questioner *and* to the community that bears the load of
finding out what the questioner needs answered ? both in this instance,
and in any future instance when people who read that suggestion want to
ask other questions.

-- 
 \      ?When I wake up in the morning, I just can't get started until |
  `\     I've had that first, piping hot pot of coffee. Oh, I've tried |
_o__)                                    other enemas...? ?Emo Philips |
Ben Finney


From robertsong.linux at gmail.com  Wed May 27 03:37:45 2009
From: robertsong.linux at gmail.com (robert song)
Date: Wed, 27 May 2009 16:37:45 +0900
Subject: Can pdb debugger save history list ?
Message-ID: <3e004f8e0905270037l7977f09dl9fe8a466cbaf8fbd@mail.gmail.com>

Hello,everyone.
Is there any configure file that can be set to save history list for
python gdb debugger?

thank you very much.


From jeremiah.dodds at gmail.com  Wed May 27 04:35:54 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Wed, 27 May 2009 09:35:54 +0100
Subject: What text editor is everyone using for Python
In-Reply-To: <e137e8260905262229r17755adax7003df44b8954eda@mail.gmail.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<85d49wf22f.fsf@agentultra.com>
	<762354ae-1d82-4a1f-aa49-eabd8f9a0173@f37g2000pro.googlegroups.com>
	<e137e8260905262229r17755adax7003df44b8954eda@mail.gmail.com>
Message-ID: <12cbbbfc0905270135o608c2f74j81e7d25dd4e239cb@mail.gmail.com>

On Wed, May 27, 2009 at 6:29 AM, Teguh Iskanto <tiskanto at gmail.com> wrote:

>
>
> BTW: "screen" does split screen too :)
>
> HTH
>
>
Unfortunately, screen only does horizontal splitting. (I heard that vertical
splitting is supposed to be in the next version of it, and is in the dev
trunk, but I don't know).

That said, screen is possibly the second most useful tool in my toolbox,
right behind emacs. If you need to interact with different machines, it's a
lifesaver. Actually, even if you don't, but you find yourself with a bunch
of terminals open (whether you're in X or not), it's still incredibly
useful.

I know this is supposed to be a discussion about text editors, but I think
that screen does deserve a mention as being very complementary to a good
text editor if you're a programmer.
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From wu at madk.org  Wed May 27 05:25:45 2009
From: wu at madk.org (Wu Zhe)
Date: Wed, 27 May 2009 17:25:45 +0800
Subject: Multiprocessing problem with producer/consumer
Message-ID: <87y6si99t2.fsf@tank.madk.org>


I am writing a server program with one producer and multiple consumers,
what confuses me is only the first task producer put into the queue gets
consumed, after which tasks enqueued no longer get consumed, they remain
in the queue forever.

from multiprocessing import Process, Pool, Queue, cpu_count
from http import httpserv

def work(queue):
    while True:
        task = queue.get()
        if task is None:
            break
        time.sleep(5)
        print "task done:", task
    queue.put(None)

class Manager:
    def __init__(self):
        self.queue = Queue()
        self.NUMBER_OF_PROCESSES = cpu_count()

    def start(self):
        self.workers = [Process(target=work, args=(self.queue,))
                        for i in xrange(self.NUMBER_OF_PROCESSES)]
        for w in self.workers
            w.start()

        httpserv(self.queue)

    def reload(self):
        print "RELOAD"

    def stop(self):
        self.queue.put(None)
        for i in range(self.NUMBER_OF_PROCESS):
            self.workers[i].join()
        queue.close()

Manager().start()

The producer is a HTTP server which put a task in the queue once receive
a request from the user. It seems that consumer processes are still
blocked when there are new tasks in the queue, which is weird.

P.S. Another two questions not relating to the above, I am not sure if
it's better to put HTTP server in its own process other than the main
process, if yes how can I make the main process keep running before all
children processes end. Second question, what's the best way to stop the
HTTP server gracefully?


From ldo at geek-central.gen.new_zealand  Wed May 27 05:32:35 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 27 May 2009 21:32:35 +1200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
Message-ID: <gvj1bj$og1$3@lust.ihug.co.nz>

In message <mailman.766.1243354300.8015.python-list at python.org>, Dennis Lee 
Bieber wrote:

> Notice that db.literal() call? That's part of the mechanism used to
> escape and quote parameters -- it only returns strings that are safe for
> insertion into the SQL statement.

Does it deal with "like"-wildcards?



From kalyanchakravarthy at hyit.com  Wed May 27 05:35:58 2009
From: kalyanchakravarthy at hyit.com (Kalyan Chakravarthy)
Date: Wed, 27 May 2009 15:05:58 +0530
Subject: which database is suitable for small applications
In-Reply-To: <52801358-c037-458d-8857-a78c2d881ddb@z16g2000prd.googlegroups.com>
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
	<mailman.744.1243333471.8015.python-list@python.org>
	<52801358-c037-458d-8857-a78c2d881ddb@z16g2000prd.googlegroups.com>
Message-ID: <8ca278430905270235n221ce4e9m25c0218ba32e65a5@mail.gmail.com>

Hi Ankit,
             Thanks for your  advice, can I get some sample code, to store
data in to flat files and how to give flat file connections to my Python
code, Because I am very new to Python and flat files

  Thanks in Advance

Kalyan

On Wed, May 27, 2009 at 10:18 AM, Ankit <mr.ankitavasthi at gmail.com> wrote:

> Hi Kalyan...
>
> If your application does not require you to add very heavy data then
> you can also use flat files to do your stuff.
> Its always a better to use Databases but given your low level use and
> newness to python... i would advise you to take up flat files instead.
>
> store your data there and access it.. simple!
>
> ANkit
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Regards
Kalyan
Mobile no: +91 9985351220
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From paul at boddie.org.uk  Wed May 27 05:45:18 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Wed, 27 May 2009 02:45:18 -0700 (PDT)
Subject: DB-API execute params, am I missing something?
References: <mailman.745.1243338813.8015.python-list@python.org>
Message-ID: <a5e204d6-29df-4637-81cd-8b8c1f485a1a@k38g2000yqh.googlegroups.com>

On 26 Mai, 13:46, Gabriel Rossetti <gabriel.rosse... at arimaz.com>
wrote:
>
> def getParams(curs):
> ? ? curs.execute("select * from param where id=%d", 1001)

First of all, you should use the database module's parameter style,
which is probably "%s" - something I've thought should be deprecated
for a long time due to the confusion with string substitution that
this causes, regardless of whether that mechanism is actually used
internally by the module (as seen in your traceback).

You also have to provide a sequence of parameters: unlike string
substitution, you cannot provide a single parameter value and expect
the execute method to do the right thing. Some database modules seem
to insist on either lists or tuples of parameters, but I think any
sequence type should work.

Try this:

  curs.execute("select * from param where id=%s", (1001,))

Paul


From deets at nospam.web.de  Wed May 27 05:58:49 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 27 May 2009 11:58:49 +0200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz>
Message-ID: <784h2cF1kem0kU1@mid.uni-berlin.de>

Lawrence D'Oliveiro wrote:

> In message <mailman.766.1243354300.8015.python-list at python.org>, Dennis
> Lee Bieber wrote:
> 
>> Notice that db.literal() call? That's part of the mechanism used to
>> escape and quote parameters -- it only returns strings that are safe for
>> insertion into the SQL statement.
> 
> Does it deal with "like"-wildcards?

Why shouldn't it? 

cursor.execute("select * from table where column like %s", "%name%")

Diez


From marco.bartolini at gmail.com  Wed May 27 06:55:43 2009
From: marco.bartolini at gmail.com (flyingfrog)
Date: Wed, 27 May 2009 03:55:43 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<87iqjnxcws.fsf@benfinney.id.au>
Message-ID: <c94ad3e3-4df1-4e64-b939-f205394faf9b@q2g2000vbr.googlegroups.com>

On 27 Mag, 08:44, Ben Finney <ben+pyt... at benfinney.id.au> wrote:
> Lacrima <Lacrima.Ma... at gmail.com> writes:
> > I am new to python.
> > And now I am using trial version of Wing IDE.
> > But nobody mentioned it as a favourite editor.
> > So should I buy it when trial is expired or there are better choices?
>
> I think your time will be better spent learning a powerful, mature,
> well-supported, free-software, programmable editor with support for an
> enormous range of text processing tasks.
>
> Either of Vim or Emacs qualify. Language-specific IDEs do not.
>
> --
>  \             ?Ladies are requested not to have children in the bar.? |
>   `\                                          ?cocktail lounge, Norway |
> _o__)                                                                  |
> Ben Finney

I like using VIM.
At this page http://blog.dispatched.ch/2009/05/24/vim-as-python-ide/
you can find some hints about how to setup some nice plugin that ease
python (and others) development.


From piet at cs.uu.nl  Wed May 27 07:12:03 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 27 May 2009 13:12:03 +0200
Subject: pyparsing question: single word values with a double quoted
	string every once in a while
References: <c3c9c0a6-2229-4f80-873c-99a43ed3a36f@s38g2000prg.googlegroups.com>
Message-ID: <m2d49u6br0.fsf@cs.uu.nl>

>>>>> hubritic <colinlandrum at gmail.com> (h) wrote:

>h> I want to parse a log that has entries like this:
>h> [2009-03-17 07:28:05.545476 -0500] rprt s=d2bpr80d6 m=2 mod=mail
>h> cmd=msg module=access rule=x_dynamic_ip action=discard attachments=0
>h> rcpts=1
>h> routes=DL_UK_ALL,NOT_DL_UK_ALL,default_inbound,firewallsafe,mail01_mail02,spfsafe
>h> size=4363 guid=291f0f108fd3a6e73a11f96f4fb9e4cd hdr_mid=
>h> qid=n2HCS4ks025832 subject="I want to interview you" duration=0.236
>h> elapsed=0.280


>h> the keywords will not always be the same. Also differing log levels
>h> will provide a different mix of keywords.

>h> This is good enough to get the majority of cases where there is a
>h> keyword, a "=" and then a value with no spaces:

>h> Group(Word(alphas + "+_-.").setResultsName("keyword") +  Suppress
>h> (Literal ("=")) + Optional(Word(printables)))

>h> Sometimes there is a subject, which is a quoted string. That is easy
>h> enough to get with this:
>h> dblQuotedString(ZeroOrMore(Word(printables) ) )

>h> My problem is combining them into one expression. Either I wind up
>h> with just the subject or I wind up with they keywords and their
>h> values, one of which is:

>h> subject, '"I'

>h> which is clearly not what I want.

>h> Do I scan each line twice, first looking for quotes ?


Use the MatchFirst (|)

I have also split it up to make it more readable

kw = Word(alphas + "+_-.").setResultsName("keyword") 
eq = Suppress(Literal ("="))
value = dblQuotedString | Optional(Word(printables))

pattern = Group(kw + eq + value)

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From noone at example.com  Wed May 27 08:25:58 2009
From: noone at example.com (Jon Bendtsen)
Date: Wed, 27 May 2009 14:25:58 +0200
Subject: nntplib.NNTPTemporaryError: 441 Article has no body -- just headers
Message-ID: <gvjbgm$12up$1@munin.diku.dk>

Hi

I'm trying to expand cvsmail.py so it posts to newsgroups, but i
constantly get this error message:
nntplib.NNTPTemporaryError: 441 Article has no body -- just headers

If i put the test message into a file then i can post it just fine,
no problems. But if i put the message into a StringIO, then i can
not post messages and i get the above error message. Where is the
problem?

>>> buffer=StringIO()
>>> f = open('/tmp/article')
>>> buffer.write(f.read())
>>> s=nntplib.NNTP('dknntp.laerdal.global')
>>> s.post(buffer)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/nntplib.py", line 570, in post
    return self.getresp()
  File "/usr/lib/python2.5/nntplib.py", line 219, in getresp
    raise NNTPTemporaryError(resp)
nntplib.NNTPTemporaryError: 441 Article has no body -- just headers
>>> buffer.getvalue()
'From: root at laerdal.dk\nSubject: testing\nNewsgroups: test\nBody:
\n\n\nfoobar\n\n\n.\n\n\n'


>>> f = open('/tmp/article')
>>> s=nntplib.NNTP('dknntp.laerdal.global')
>>> s.post(f)
'240 Article posted <gvjaqv$k91$1 at dknntp.laerdal.global>'


>>> f = open('/tmp/article')
>>> f.read()
'From: root at laerdal.dk\nSubject: testing\nNewsgroups: test\nBody:
\n\n\nfoobar\n\n\n.\n\n\n'
>>> buffer.getvalue()
'From: root at laerdal.dk\nSubject: testing\nNewsgroups: test\nBody:
\n\n\nfoobar\n\n\n.\n\n\n'
>>> f = open('/tmp/article')
>>> if f.read() == buffer.getvalue():
...   print 'true'
...
true


From rustompmody at gmail.com  Wed May 27 08:31:57 2009
From: rustompmody at gmail.com (rustom)
Date: Wed, 27 May 2009 05:31:57 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<87iqjnxcws.fsf@benfinney.id.au>
	<c94ad3e3-4df1-4e64-b939-f205394faf9b@q2g2000vbr.googlegroups.com>
Message-ID: <6413d692-c3b5-40db-a53a-b000052ca0d5@y10g2000prc.googlegroups.com>

I dont think Ive seen it said on this thread (if yes sorry for missing
it)

If you use emacs

1. DONT use the python.el that comes with emacs but use python-mode.el
that comes from python
2. Use python as an interpreter ie not as you would use C or Java
or ... which is to say
2.1 Start python as an interpreter under emacs ... which (assuming
emacs is set up properly) means
2.1.1 M-x py-shell or
2.1.2 From a python source file C-c C-c
2.2 Dont (PLEASE) start a shell and start python in that; start a
genuine 'inferior' python under emacs
      (yes emacs-speak is a bit weird but once you get used to it it
has no replacement)
3. The most useful paradigm of noob hacking of python in emacs is to
split the window into 2, keep your python file in one and the inferior
python interpreter in the other.
4. After you've graduated out of noob status you may like to look at
4.1 pdb (Ive not managed to get this to run on windows)
4.2 doctest mode
4.3 rope
4.4 ipython


From abolotnov at gmail.com  Wed May 27 08:45:27 2009
From: abolotnov at gmail.com (abolotnov)
Date: Wed, 27 May 2009 05:45:27 -0700 (PDT)
Subject: Building mySQL-python with python 2.6
Message-ID: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>

Hi, I am trying to build mySQL-python with python 2.6 on windows and
can't figure what's wrong with it.

D:\temp\mysqlPyC\MySQL?python?1.2.3c1>python setup.py build
running build
running build_py
copying MySQLdb\release.py ?> build\lib.win32?2.6\MySQLdb
running build_ext
building '_mysql' extension
error: Unable to find vcvarsall.bat

the vcvarsall.bat is in %path% though:

D:\temp\mysqlPyC\MySQL?python?1.2.3c1>vcvarsall.bat
Setting environment for using Microsoft Visual Studio 2010 x86 tools.

Are there python settings that point to specific compiler directory or
something that I need to change/update?


From albert at spenarnc.xs4all.nl  Wed May 27 08:58:02 2009
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 27 May 2009 12:58:02 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de>
	<02204669$0$25303$c3e8da3@news.astraweb.com>
Message-ID: <kkb00q.g62@spenarnc.xs4all.nl>

In article <02204669$0$25303$c3e8da3 at news.astraweb.com>,
Steven D'Aprano  <steve at REMOVE-THIS-cybersource.com.au> wrote:
>On Sun, 17 May 2009 18:24:34 +0200, Diez B. Roggisch wrote:
>
>>> But reduce()? I can't see how you can parallelize reduce(). By its
>>> nature, it has to run sequentially: it can't operate on the nth item
>>> until it is operated on the (n-1)th item.
>>
>> That depends on the operation in question. Addition for example would
>> work.
>
>You'd think so, but you'd be wrong. You can't assume addition is always
>commutative.
>
>>>> reduce(operator.add, (1.0, 1e57, -1e57))
>0.0
>>>> reduce(operator.add, (1e57, -1e57, 1.0))
>1.0
>
>
>
>> My math-skills are a bit too rusty to qualify the exact nature of
>> the operation, commutativity springs to my mind.
>
>And how is reduce() supposed to know whether or not some arbitrary
>function is commutative?

Why would it or need it? A Python that understands the ``par''
keyword is supposed to know it can play some tricks with
optimizing reduce() if the specific function is commutative.

>--
>Steven

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- like all pyramid schemes -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From lists at cheimes.de  Wed May 27 08:58:40 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 27 May 2009 14:58:40 +0200
Subject: Building mySQL-python with python 2.6
In-Reply-To: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>
Message-ID: <4A1D3900.8070706@cheimes.de>

abolotnov schrieb:
> Hi, I am trying to build mySQL-python with python 2.6 on windows and
> can't figure what's wrong with it.
> 
> D:\temp\mysqlPyC\MySQL?python?1.2.3c1>python setup.py build
> running build
> running build_py
> copying MySQLdb\release.py ?> build\lib.win32?2.6\MySQLdb
> running build_ext
> building '_mysql' extension
> error: Unable to find vcvarsall.bat
> 
> the vcvarsall.bat is in %path% though:
> 
> D:\temp\mysqlPyC\MySQL?python?1.2.3c1>vcvarsall.bat
> Setting environment for using Microsoft Visual Studio 2010 x86 tools.

You need Visual Studio 2008. Other versions of VS aren't supported by
Python 2.6.

Christian


From abolotnov at gmail.com  Wed May 27 09:01:17 2009
From: abolotnov at gmail.com (abolotnov)
Date: Wed, 27 May 2009 06:01:17 -0700 (PDT)
Subject: Building mySQL-python with python 2.6
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>
	<mailman.793.1243429122.8015.python-list@python.org>
Message-ID: <9664ac1f-0760-4be8-9e2f-7746af5cf7aa@y9g2000yqg.googlegroups.com>


> You need Visual Studio 2008. Other versions of VS aren't supported by
> Python 2.6.

Aren't 2005, 2008+ versions all have same c compiler - it's just the
IDE versions that are different?


From imanway4444 at gmail.com  Wed May 27 09:20:57 2009
From: imanway4444 at gmail.com (sunnia)
Date: Wed, 27 May 2009 06:20:57 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<mailman.449.1242835175.8015.python-list@python.org>
	<01076ad2-705b-4aea-9867-d19d4adc6693@m17g2000vbi.googlegroups.com>
	<mailman.468.1242855538.8015.python-list@python.org>
Message-ID: <d4f08814-4f5e-4ded-b9ae-2c8e0a177c21@g37g2000yqn.googlegroups.com>

On May 20, 10:38?pm, Luis Zarrabeitia <ky... at uh.cu> wrote:
> On Wednesday 20 May 2009 04:32:59 pm Carl Banks wrote:
>
> > I wasn't really arguing that locking individual objects was a
> > significant penalty in computer time, only in programmer time. ?The
> > locks on reference counts are what's expensive.
>
> > Also, I'm not using it as an argument against removing the GIL. ?I
> > want to remove the GIL. ?I'm only pointing out that removing the GIL
> > is not easy, and once it's removed there is a cost.
>
> Ah, allright then. Thanks for the clarification.
>
> --
> Luis Zarrabeitia (aka Kyrie)
> Fac. de Matem?tica y Computaci?n, UH.http://profesores.matcom.uh.cu/~kyrie

The Judicial System in Islam : Its Legal Basis and Islam Ruling
Please forgive us for any disturbance, but we have an important
subject to address to you regarding FAITH, and we Don?t intend to
overload your email with unnecessary messages?

The Judicial System in Islam : Its Legal Basis and Islam Ruling

By The Editorial Team of Dr. Abdurrahman al-Muala (translated by
islamtoday.com)


Defining the Judicial System and its Legal basis

The judicial system in Islam is a system for deciding between people
in litigation with the aim of settling their disputes in accordance
with the injunctions of the Divine Law, injunctions that are taken
from the Quran and Sunnah.

All of the Messengers of God (may God praise them all) acted as
judges. God says:

?And remember David and Solomon, when they gave judgment concerning
the field when people?s sheep had browsed therein at night, and We
were witness to their judgment. And We made Solomon to understand the
case. And to each of them We gave good judgment and knowledge.? (Quran
21:78-79)
God also says:

?O David, verily we have placed you as a successor on Earth, so judge
between people in truth, and do not follow your desires for it will
mislead you from the path of God. Verily, those who stray from the
path of God have a severe punishment because they forgot the day of
reckoning.? (Quran 38:26)

Prophet Muhammad, who came with the final and eternal Message, was
ordered by God to pass judgment in disputes just as he was ordered to
spread the word of God and call people to Islam. This is mentioned in
the Quran in a number of places. God says, for instance:

?So judge (O Muhammad) between them by what God has revealed and do
not follow their vain desires, but beware of them lest they turn you
away from some of what God has sent down to you.? (Quran 5:49)

God also says:

??And if you judge (O Muhammad), judge between them with justice.
Verily, God loves those who act justly.? (Quran 5:42)

And He says:

?But no, by your Lord, they shall have no faith until they make you (O
Muhammad) judge in all their disputes and find in themselves no
resistance against your decisions and accept them with full
submission.? (Quran 4:65)

The Sunnah also provides for the legal basis of the Islamic judicial
system. It is related by Amr b. al-Aas that the Prophet said:

?If a judge gives a judgment using his best judgment and is correct,
then he receives a double reward (from God). If he uses his best
judgment but makes a mistake, then he receives a single
reward.? (Ahmed)

God?s Messenger said:

?You should not wish to be like other people, except in two cases: a
man who God has given wealth and he spends it on Truth and another who
God has granted wisdom and he gives verdicts on its basis and teaches
others.? (Saheeh Al-Bukhari, Saheeh Muslim)

Many scholars have related to us that there is consensus among Muslims
on the legal status of the judicial system in Islam. Ibn Qudamah says:

?The Muslims are unanimously agreed that a judicial system must be
established for the people.?
The Islamic Ruling Concerning the Judiciary

The jurists agree that the duties of the judge are an obligation that
must be carried out by society. If some members of society carry out
this duty, it is sufficient for everyone. If, on the other hand,
everyone neglects it, then everyone in society is sinful.

The proof that these duties are obligatory comes from the Quran:

?O you who believe! Stand out firmly for justice...? (Quran 4:135)

It is only necessary for a small number of individuals to perform
judicial duties since judicial concerns come under the broad duty of
enjoining what is right and forbidding what is wrong. It is not
obligatory for every individual to carry out this duty as long as some
people are doing so.

The affairs of the people will not be correct and upright without a
judicial system. It is, consequently, obligatory for one to exist,
just like it is necessary to have a military. Imam Ahmad, one of the
greatest and most well-known scholars of Islam said:

?People have to have a judicial authority or their rights will
disappear.?

The duties of the judiciary include enjoining what is right, helping
the oppressed, securing people?s rights, and keeping oppressive
behavior in check. None of these duties can be performed without the
appointment of a judiciary.

A judicial system is a necessity for the prosperity and development of
nations. It is needed to secure human happiness, protect the rights of
the oppressed, and restrain the oppressor. It is the way to resolve
disputes and ensure human rights. It facilitates enjoining what is
right, forbidding what is wrong, and curbing immoral behavior. In this
way, a just social order can be enjoyed by all sectors of society, and
every individual can feel secure in his life, property, honor, and
liberty. In this environment, nations can progress, civilization can
be achieved, and people are free to pursue what will better them both
spiritually and materially.




???????????-


For more information about Islam

http://english.islamway.com/

http://www.islamhouse.com/

http://www.discoverislam.com/

http://www.islambasics.com/index.php

http://english.islamway.com/

http://www.islamtoday.net/english/

http://www.islamweb.net/ver2/MainPage/indexe.php

http://www.sultan.org/

http://www.islamonline.net/

Contact Us At

imanway.qa at gmail.com





From lists at cheimes.de  Wed May 27 09:27:38 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 27 May 2009 15:27:38 +0200
Subject: Building mySQL-python with python 2.6
In-Reply-To: <9664ac1f-0760-4be8-9e2f-7746af5cf7aa@y9g2000yqg.googlegroups.com>
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>	<mailman.793.1243429122.8015.python-list@python.org>
	<9664ac1f-0760-4be8-9e2f-7746af5cf7aa@y9g2000yqg.googlegroups.com>
Message-ID: <4A1D3FCA.4020901@cheimes.de>

abolotnov schrieb:
>> You need Visual Studio 2008. Other versions of VS aren't supported by
>> Python 2.6.
> 
> Aren't 2005, 2008+ versions all have same c compiler - it's just the
> IDE versions that are different?

There are important differences between the several versions of VC++.
The most important discrepancy is the runtime library version. Each
version of Visual Studio uses its own msvcrt dll. The command line
options, deprecated functions, project file formats and other things are
also slightly different.

Christian


From google at mrabarnett.plus.com  Wed May 27 10:35:23 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 27 May 2009 15:35:23 +0100
Subject: Question in VB DLL COM event in Delphi Programming
In-Reply-To: <200905270250.n4R2oQTZ019353@pp-proxy01.tm.net.my>
References: <200905270250.n4R2oQTZ019353@pp-proxy01.tm.net.my>
Message-ID: <4A1D4FAB.3010901@mrabarnett.plus.com>

Tan, Yih Hung wrote:
> I have a question regarding Delphi COM programming. I have a VB DLL 
> (ActiveX COM DLL) and this DLL contain 2 classes, one is for normal 
> client function calling, and the other one is events raised by this DLL 
> to notify the client. Now, I would like to incorporate this DLL into 
> Delphi (bind the DLL into Delphi program) so that when the events raised 
> by this DLL,  it can be capture in the Delphi program. I am new in 
> Delphi and I would like to need your help or advice on this integration. 
> I could send you the sample code in VB and the VB DLL if you need. 
> Thanks in advance.
> 
This newsgroup is for the Python programming language. You'll have a
better chance of help with Delphi from a Delphi newsgroup.


From google at mrabarnett.plus.com  Wed May 27 10:44:48 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 27 May 2009 15:44:48 +0100
Subject: Multiprocessing problem with producer/consumer
In-Reply-To: <87y6si99t2.fsf@tank.madk.org>
References: <87y6si99t2.fsf@tank.madk.org>
Message-ID: <4A1D51E0.3000503@mrabarnett.plus.com>

Wu Zhe wrote:
> I am writing a server program with one producer and multiple consumers,
> what confuses me is only the first task producer put into the queue gets
> consumed, after which tasks enqueued no longer get consumed, they remain
> in the queue forever.
> 
> from multiprocessing import Process, Pool, Queue, cpu_count
> from http import httpserv
> 
> def work(queue):
>     while True:
>         task = queue.get()
>         if task is None:
>             break
>         time.sleep(5)

The 'time' module hasn't been imported, so the worker raises an
exception when it gets to this line and then terminates.

>         print "task done:", task
>     queue.put(None)
> 
> class Manager:
>     def __init__(self):
>         self.queue = Queue()
>         self.NUMBER_OF_PROCESSES = cpu_count()
> 
>     def start(self):
>         self.workers = [Process(target=work, args=(self.queue,))
>                         for i in xrange(self.NUMBER_OF_PROCESSES)]
>         for w in self.workers

Missing ":" on the end of the line.

>             w.start()
> 
>         httpserv(self.queue)
> 
>     def reload(self):
>         print "RELOAD"
> 
>     def stop(self):
>         self.queue.put(None)
>         for i in range(self.NUMBER_OF_PROCESS):

Should be "self.NUMBER_OF_PROCESSES".

>             self.workers[i].join()
>         queue.close()
> 
> Manager().start()
> 
> The producer is a HTTP server which put a task in the queue once receive
> a request from the user. It seems that consumer processes are still
> blocked when there are new tasks in the queue, which is weird.
> 
> P.S. Another two questions not relating to the above, I am not sure if
> it's better to put HTTP server in its own process other than the main
> process, if yes how can I make the main process keep running before all
> children processes end. Second question, what's the best way to stop the
> HTTP server gracefully?



From ethan at stoneleaf.us  Wed May 27 10:55:12 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Wed, 27 May 2009 07:55:12 -0700
Subject: dbfpy - cannot store new record
In-Reply-To: <4A157902.9080507@shopzeus.com>
References: <4A153A10.1080906@shopzeus.com> <4A157902.9080507@shopzeus.com>
Message-ID: <4A1D5450.80003@stoneleaf.us>

Laszlo Nagy wrote:
> Here is the next problem. For boolean/logical fields, I can set their 
> value to True/False easily. However, setting NULL seems impossible:
> 
> rec = tbl.newRecord()
> rec["SOMEFIELD1"] = True # Works fine
> rec["SOMEFIELD2"] = False # Works fine
> rec["SOMEFIELD3"] = None # Will store False
> rec["SOMEFIELD3"] = 0 # Will store False
> rec["SOMEFIELD3"] = "" # Will store False
> rec["SOMEFIELD3"] = chr(32) # Will store False
> rec["SOMEFIELD3"] = chr(0) # Will store False
> rec.store()
> 
> Strange thing: if I do not set the value of a numeric field, it becomes 
> NULL. The same thing I cannot do for logical fields: if I do not set the 
> value of a logical field, it becomes an invalid value, denoted with a 
> question mark.
> 
> Any ideas?
> 
> Thanks,
> 
>   Laszlo
> 


Not sure if this would help, but you might try

http://groups.google.com/group/python-dbase

At this point, the only data types allowed to be Null are dates and 
times, everything else is coerced to Pythons idea of nothing if not set 
(strings are '', numerics are 0, etc -- again, the only exception being 
dates and times which, IIRC, default to the moment of record creation).

Hope this helps.

~Ethan~


From kyrie at uh.cu  Wed May 27 11:07:21 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 27 May 2009 11:07:21 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <gv4st8$11t$1@ger.gmane.org>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<4A15EF9E.8070406@islandtraining.com> <gv4st8$11t$1@ger.gmane.org>
Message-ID: <200905271107.21750.kyrie@uh.cu>

On Thursday 21 May 2009 08:50:48 pm R. David Murray wrote:

> In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
> point algorithm for Python so that the shortest repr that will round
> trip correctly is what is used as the floating point repr....

Little question: what was the goal of such a change? (is there a pep for me to 
read?) Shouldn't str() do that, and leave repr as is?

While I agree that the change gets rid of the weekly newbie question 
about "python's lack precision", I'd find more difficult to explain why
0.2 * 3 != 0.6 without showing them what 0.2 /really/ means.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From Scott.Daniels at Acm.Org  Wed May 27 11:08:53 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 27 May 2009 08:08:53 -0700
Subject: How do I sample randomly based on some probability(wightage)?
In-Reply-To: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
Message-ID: <uIadnZ8appu3y4DXnZ2dnUVZ_radnZ2d@pdx.net>

Sumitava Mukherjee wrote:
> I need to randomly sample from a list where all choices have weights
> attached to them. The probability of them being choosen is dependent
> on the weights.
I am not sure why everybody is normalizing by dividing the weights.
This isa possibility (I had fun writing it).

def sample_without_replacement(choices, weights):
     '''Yield elements sampled w/o replacement by weighting'''
     if len(weights) != len(choices):
         raise ValueError('%d choices, but %d weights?' % (
             len(choices), len(weights)))
     if min(weights) < 0:
         raise ValueError('Negative weights?: %s' % (
                     [(i, w) for i, w in enumerate(weights) if w < 0]))

     # look at only non-zero probabilities
     combined = [(w, v) for w, v in zip(weights, choices) if w > 0]

     # Go from highest probability down to reduce expected traversal
     combined.sort(key=operator.itemgetter(0), reverse=True)

     total = sum(w for w, v in combined) # sum(weights) also works
     while combined:
         spot = sample = random.random() * total
         for n, (weight, choice) in enumerate(combined):
             spot -= weight
             if spot <= 0:
                 break
         else:
             # n, (weight, choice) = 0, combined[0] # Highest probability
             raise ValueError('%f left after choosing %f/%f?: %s' % (
                                 spot, sample, total, combined))
         yield choice
         total -= weight
         if weight > total * 256: # arbitrary choice for recalculation
             # precision affected, rebuild
             total = sum(w for w, v in combined)
         del combined[n]
     raise ValueError('Samplng more than %d without replacement?' % (
                       sum(1 for w in weights if w > 0)))

for n in range(10):
     gen = sample_without_replacement('abcdef', [32,16,8,4,2,1])
     print gen.next(), gen.next(), gen.next()

--Scott David Daniels
Scott.Daniels at Acm.Org


From Scott.Daniels at Acm.Org  Wed May 27 11:17:51 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 27 May 2009 08:17:51 -0700
Subject: Building mySQL-python with python 2.6
In-Reply-To: <mailman.793.1243429122.8015.python-list@python.org>
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>
	<mailman.793.1243429122.8015.python-list@python.org>
Message-ID: <9-6dnT0O5_7YxYDXnZ2dnUVZ_tti4p2d@pdx.net>

Christian Heimes wrote:
> abolotnov schrieb:
>> Hi, I am trying to build mySQL-python with python 2.6 on windows and
>> can't figure what's wrong with it.
...
> You need Visual Studio 2008. Other versions of VS aren't supported by
> Python 2.6.

You might be able to use mingw32 as well.

--Scott David Daniels
Scott.Daniels at Acm.Org


From chinthakawk at gmail.com  Wed May 27 11:50:47 2009
From: chinthakawk at gmail.com (godshorse)
Date: Wed, 27 May 2009 08:50:47 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <72ea150d-cec6-422e-866b-a2450a3acccd@o5g2000prh.googlegroups.com>

On May 26, 7:07?pm, Lacrima <Lacrima.Ma... at gmail.com> wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

Hello,

I too new to Python. I tried several IDEs and ended up with Wing IDE.
I used the trial version till it expired. Then found out that Wing
team has a scaled down version of Wing IDE called 'Wing IDE 101'.
http://www.wingware.com/downloads/wingide-101

Give it a try. It just lags few functions than Wing IDE.

But its really simple and light.


From bruno.42.desthuilliers at websiteburo.invalid  Wed May 27 11:56:12 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 27 May 2009 17:56:12 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <mailman.782.1243385070.8015.python-list@python.org>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<gvg5d7$382$2@lust.ihug.co.nz>	<mailman.741.1243325683.8015.python-list@python.org>	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
Message-ID: <4a1d628f$0$6471$426a74cc@news.free.fr>

Rhodri James a ?crit :
> On Tue, 26 May 2009 14:22:29 +0100, Roy Smith <roy at panix.com> wrote:
> 
>> My pet peeve is syntax-aware editors which get things wrong.  For 
>> example,
>> the version of emacs I'm using now doesn't parse this properly:
>>
>> '''A triple-quoted string.  Some editors won't get this right'''
>>
>> The solution is to change the outer quotes to double-quotes, but it 
>> annoys me when I have to change my code to appease a tool.
> 
> It's the separate python-mode that gets this (and much else) wrong.
> The Python mode that Ubuntu packages with emacs 22.2.1 works just
> fine.

On this point, indeed. But it also lacks almost every nice feature of 
the One True python-mode (or at least did last time I had to update this 
... ubuntu box at work).



From bryanvick at gmail.com  Wed May 27 11:59:21 2009
From: bryanvick at gmail.com (Bryan)
Date: Wed, 27 May 2009 08:59:21 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <b679f757-e237-4b3a-814a-07a11cab0a76@g22g2000pra.googlegroups.com>

On May 26, 5:07?am, Lacrima <Lacrima.Ma... at gmail.com> wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

First read this and think about where you want to invest your time,
IDE or text: http://osteele.com/archives/2004/11/ides

After working in a large IDE at first, I am glad I invested time into
learning a powerful console-based text editor (VIM).  Now my entire
dev environment is accessible from any networked computer, and I can
do everything without touching that horrible mouse contraption.

Bryan



From bruno.42.desthuilliers at websiteburo.invalid  Wed May 27 12:07:26 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 27 May 2009 18:07:26 +0200
Subject: How does Python's OOP feel?
In-Reply-To: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
Message-ID: <4a1d6531$0$31019$426a34cc@news.free.fr>

Ikon a ?crit :
> I'm rather new to Python. I have PHP for my main language and I do
> some Java. They all have a very strict OO schema.

I would describe PHP's "OO schema" as "very strict" (FWIW, I wouldn't 
qualify anything PHP as "strict" in any way...)

> As I red through
> Python's tutorial it seams it has nothing of those rules. No statical,
> abstract classes, functions, or variables.

Why so ?

> I wish someone, who has experience in both Java/PHP/C# and Python
> would tell me how mush better/worse is it to program in a language
> that misses most of the OO parts!

Where did you read that these were "most of the OO parts" ? All those 
dumb qualifiers are C++/Java's very peculiar (mis)understanding of OO. 
All you need to do proper OO are objects (defined by a unique id, a 
state and a behaviour) and messages.

As far as I'm concerned, what I don't understand is how one can do OO in 
a language that has non-object "objects" (ie: primitive types etc).

Anyway... Python's object model is indeed quite different from what 
you've "learned" with Java and PHP, and you'll have to first unlearn 
most of what you think you know about OO. OTHO, once you do understand 
Python's object model and it's incredible flexibility and power, you 
won't want to hear about Java anymore. Not to say Python is the "more 
pure" OOPL ever (if that's what you're after, Smalltalk is your friend - 
but it's not really used that much nowadays...), it's firstly a very 
*practical* language, but still it's OO all the way down (everything - 
including functions and classes and modules - is an object), and it 
really makes OO easy and usefull.

My 2 cents...


From gunterhenriksen at gmail.com  Wed May 27 12:16:28 2009
From: gunterhenriksen at gmail.com (Gunter Henriksen)
Date: Wed, 27 May 2009 09:16:28 -0700
Subject: What text editor is everyone using for Python
In-Reply-To: <gvibnh$bsq$3@lust.ihug.co.nz>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4A1BEDB0.6000100@sequans.com> <4A1C0806.2090802@seehart.com>
	<mailman.764.1243352981.8015.python-list@python.org>
	<roy-97FE62.19585126052009@news.panix.com>
	<gvibnh$bsq$3@lust.ihug.co.nz>
Message-ID: <ab4fa3490905270916k6473aea9ydb6f3307d1856dd@mail.gmail.com>

> This, ladies and gentlemen of the jury, points
> up the essential difference between a modal and
> a non-modal way of doing things.

That is one reason I love emacs... I not only
get a selection of several "major modes", I
can also have multiple "minor modes" active at
the same time!  And I can extend it with a pure
language like LISP rather than something like
Vim which tends to prefer Python for extension.


From wong_powah at yahoo.ca  Wed May 27 12:29:27 2009
From: wong_powah at yahoo.ca (powah)
Date: Wed, 27 May 2009 09:29:27 -0700 (PDT)
Subject: download all mib files from a web page
Message-ID: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>

I want to download all mib files from the web page:
http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19

All mib filenames are of this format:
www.juniper.net/techpubs ... .txt

I write this program but has the following error.
Please help.
Thanks.

[code]
#!/usr/bin/env python
import urllib2,os,urlparse
url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
page=urllib2.urlopen(url)
f=0
links=[]
data=page.read().split("\n")
for item in data:
    if "www.juniper.net/techpubs" in item:
        httpind=item.index("www.juniper.net/techpubs")
        item=item[httpind:]
        #print "item " + item
        ind=item.index("<")
        links.append(item[:ind]) #grab all links
# download all links
for link in links:
    print "link " + link
    filename=link.split("/")[-1]
    print "downloading ... " + filename
    u=urllib2.urlopen(link)
    p=u.read()
    open(filename,"w").write(p)
[/code]

$ ~/python/downloadjuniper.py
link www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib-jnx-user-aaa.txt
downloading ... mib-jnx-user-aaa.txt
Traceback (most recent call last):
  File "/home/powah/python/downloadjuniper.py", line 20, in ?
    u=urllib2.urlopen(link)
  File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
    return _opener.open(url, data)
  File "/usr/lib/python2.4/urllib2.py", line 350, in open
    protocol = req.get_type()
  File "/usr/lib/python2.4/urllib2.py", line 233, in get_type
    raise ValueError, "unknown url type: %s" % self.__original
ValueError: unknown url type:
www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib-jnx-user-aaa.txt



$ python
Python 2.4.4 (#1, Oct 23 2006, 13:58:00)
[GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

My computer is FC6 linux.


From kyrie at uh.cu  Wed May 27 12:35:09 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 27 May 2009 12:35:09 -0400
Subject: Python Socket Issues with VirtualBox
In-Reply-To: <1m9rekec3z2d3$.1j7hcy0d7aaei$.dlg@40tude.net>
References: <45133930-0502-44fb-9d9b-83d22159e6f0@u9g2000pre.googlegroups.com>
	<1m9rekec3z2d3$.1j7hcy0d7aaei$.dlg@40tude.net>
Message-ID: <200905271235.09702.kyrie@uh.cu>

On Friday 22 May 2009 11:05:42 am Alan Franzoni wrote:
> TechieInsights was kind enough to say:
[...]
> My first guess would be that you didn't specify the interface to bind to,
> and the interface order changes once you install virtualbox since it
> possibly adds a virtual interface of its own, 
[...]

And there is another possible cause: by default, virtualbox networking uses 
nat. The virtual machine sees both a local interface with a private IP, and 
a "router". The host, however, sees none, making it impossible to connect 
_to_ the virtual machine, or to open a listening socket in the "router"'s IP.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From akraemer at sbcglobal.net  Wed May 27 12:42:55 2009
From: akraemer at sbcglobal.net (Andreas Kraemer)
Date: Wed, 27 May 2009 09:42:55 -0700 (PDT)
Subject: print stream behavior
Message-ID: <d73e7eae-42a6-4154-b965-bc3239d3243c@y10g2000prc.googlegroups.com>

I don't understand the behavior of the print statement when streaming
to a "file-like" object. From the documentation at
http://www.python.org/doc/2.4.4/ref/print.html I understand that the
file-like object needs to have a write() method that - I assume - is
called when the print statement is invoked. However, the piece of code
below does not behave as I expect.

F subclasses file and overwrites its write() method (simply printing
out a message and then calling the superclass's write()). Calling
write directly works as expected, using print does not.

Can anybody shed some light on what's happening under the hood (or how
to make it work with "print")?

Thanks,
Andreas

Python 2.4.2 (#1, Jan 10 2008, 17:43:47)
[GCC 4.1.2 20070115 (prerelease) (SUSE Linux)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class F(file):
...   def write(self,str):
...     print 'writing to %s: %s' % (self.name,str)
...     file.write(self,str)
...
>>> f = F('test.txt','w')
>>> f.write('hallo')
writing to test.txt: hallo
>>> print >>f, 'good bye'
>>>

$ cat test.txt
hallogood bye



From kyrie at uh.cu  Wed May 27 13:00:08 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 27 May 2009 13:00:08 -0400
Subject: How to create a list of functions depending on a parameter?
In-Reply-To: <87fxes6xy9.fsf@rudin.co.uk>
References: <cd743890-3bd0-42c3-acd6-c031f9ebeacc@b6g2000pre.googlegroups.com>
	<87fxes6xy9.fsf@rudin.co.uk>
Message-ID: <200905271300.09076.kyrie@uh.cu>

On Tuesday 26 May 2009 05:00:14 am Paul Rudin wrote:
>
> class Foo(object):
>
>     def __init__(self, pos):
>         self.pos = pos
>
>     def __call__(self, arg):
>         return self.pos + arg
>
> f = [Foo(x) for x in range(10)]

Or, without the class:

In [1]: def get_incrementor(n):
   ...:     def inc(x):
   ...:         return x+n
   ...:     return inc
   ...:

In [3]: fs = [get_incrementor(n) for n in xrange(10)]

In [4]: fs[2](1)
Out[4]: 3




-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From clp2 at rebertia.com  Wed May 27 13:33:33 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 27 May 2009 10:33:33 -0700
Subject: download all mib files from a web page
In-Reply-To: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
Message-ID: <50697b2c0905271033l302021ebm736db95b5b15d339@mail.gmail.com>

On Wed, May 27, 2009 at 9:29 AM, powah <wong_powah at yahoo.ca> wrote:
> I want to download all mib files from the web page:
> http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19
>
> All mib filenames are of this format:
> www.juniper.net/techpubs ... .txt
>
> I write this program but has the following error.
> Please help.
> Thanks.
>
> [code]
> #!/usr/bin/env python
> import urllib2,os,urlparse
> url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
> net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
> page=urllib2.urlopen(url)
> f=0
> links=[]
> data=page.read().split("\n")
> for item in data:
> ? ?if "www.juniper.net/techpubs" in item:
> ? ? ? ?httpind=item.index("www.juniper.net/techpubs")
> ? ? ? ?item=item[httpind:]
> ? ? ? ?#print "item " + item
> ? ? ? ?ind=item.index("<")
> ? ? ? ?links.append(item[:ind]) #grab all links
> # download all links
> for link in links:
> ? ?print "link " + link
> ? ?filename=link.split("/")[-1]
> ? ?print "downloading ... " + filename
> ? ?u=urllib2.urlopen(link)
> ? ?p=u.read()
> ? ?open(filename,"w").write(p)
> [/code]
>
> $ ~/python/downloadjuniper.py
> link www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib-jnx-user-aaa.txt
> downloading ... mib-jnx-user-aaa.txt
> Traceback (most recent call last):
> ?File "/home/powah/python/downloadjuniper.py", line 20, in ?
> ? ?u=urllib2.urlopen(link)
> ?File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
> ? ?return _opener.open(url, data)
> ?File "/usr/lib/python2.4/urllib2.py", line 350, in open
> ? ?protocol = req.get_type()
> ?File "/usr/lib/python2.4/urllib2.py", line 233, in get_type
> ? ?raise ValueError, "unknown url type: %s" % self.__original
> ValueError: unknown url type:
> www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib-jnx-user-aaa.txt

You need to ensure that all URL strings include the protocol to use,
i.e. "http://"

Cheers,
Chris
-- 
http://blog.rebertia.com


From Colin.Hankins at touit.com  Wed May 27 13:36:09 2009
From: Colin.Hankins at touit.com (Colin.Hankins at touit.com)
Date: Wed, 27 May 2009 10:36:09 -0700 (PDT)
Subject: List reference at offset
Message-ID: <f9bb0329-48ca-4e9e-a20e-4cda1c1e5c91@o5g2000prh.googlegroups.com>

Disclaimer: I'm learning python and would like to use it in a
project.

The project will have many large matricies. In one particular instance
I need to reference a smaller submatrix of the larger matrix. I don't
want to create a new copy or even change any of the values, I just
want to quickly and easily be able to look at this sub matrix.

So I am using lists of lists for the matricies (I am also playing with
NumPy) and is there anyway to create a pointer to an offset in a
list?

I know you can have A = B = [] which would be the same.

And I know I can simply do a B[x + offset to submatrix].

But I was hoping there may be a way to just have a pointer? Or is
there another more efficient method to do this in python?

Thanks!


From mtw at protomagic.com  Wed May 27 13:47:19 2009
From: mtw at protomagic.com (Michael Werner)
Date: Wed, 27 May 2009 13:47:19 -0400
Subject: Announce: pcp-0.1
Message-ID: <D6E17AD7-10A8-4960-8AAB-040444E8179E@protomagic.com>


Name:        pcp-0.1
Description: Python Interface to SGI's Performance Co-Pilot client API
License:     GNU LGPL
Download:    ftp://oss.sgi.com/www/projects/pcp/download/python- 
pcp-0.1.tar.gz
Web:         http://oss.sgi.com/projects/pcp/

Author:      Michael Werner
Email:       mtw at protomagic dot com


Description of this Python Extension
-----------------------------

This python extension, called pcp, provides an interface to the  
client C API
for SGI's open source Performance Co-Pilot. This is a very early  
release and
some core functionality is missing, namely reading and writing  
archive files.
A set of convenience classes is provided, which build upon the base
functionality of SGI's library. These convenience classes may change in
future releases, as use-cases evolve and feedback suggests. A sample  
program
is included.


Description of SGI's Performance Co-Pilot
-----------------------------

Performance Co-Pilot is a distributed mechanism for measuring and  
recording
the performance and activity of computers, networks, applications, and
servers. PCP also includes an inference engine that can trigger  
responses
to measured conditions or events.  Several hundred different operational
parameters can be measured from target machines, their operating  
systems,
MySQL, Apache, Sendmail, VMWare, KVM, etc. There is a server-side  
library
available for writing additional plug-in modules to measure any  
custom target
application or server. There is a client-side library for writing custom
applications to collect and utilize measurements. This python  
extension wraps
that client-side C library, libpcp. Performance Co-Pilot is known to  
run on
Windows and many Unix/Linux variants.


Example Application
-----------------------------

To see an example prototype application that uses these python  
extensions
to visualize system activity, visit ...
http://blenderartists.org/forum/showthread.php?t=157085


Python.org site URL
-----------------------------

<p><a href="http://oss.sgi.com/projects/pcp/">pcp 0.1</a> - Python
Interface to SGI's  Performance Co-Pilot client API (22-May-09)

-----------------------------



From jeff at jmcneil.net  Wed May 27 13:50:31 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Wed, 27 May 2009 10:50:31 -0700 (PDT)
Subject: download all mib files from a web page
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
Message-ID: <82e5df8f-8ff2-4a33-9729-38ff8d777c23@b1g2000vbc.googlegroups.com>

On May 27, 12:29?pm, powah <wong_po... at yahoo.ca> wrote:
> I want to download all mib files from the web page:http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-m...
>
> All mib filenames are of this format:www.juniper.net/techpubs... .txt
>
> I write this program but has the following error.
> Please help.
> Thanks.
>
> [code]
> #!/usr/bin/env python
> import urllib2,os,urlparse
> url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
> net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
> page=urllib2.urlopen(url)
> f=0
> links=[]
> data=page.read().split("\n")
> for item in data:
> ? ? if "www.juniper.net/techpubs" in item:
> ? ? ? ? httpind=item.index("www.juniper.net/techpubs")
> ? ? ? ? item=item[httpind:]
> ? ? ? ? #print "item " + item
> ? ? ? ? ind=item.index("<")
> ? ? ? ? links.append(item[:ind]) #grab all links
> # download all links
> for link in links:
> ? ? print "link " + link
> ? ? filename=link.split("/")[-1]
> ? ? print "downloading ... " + filename
> ? ? u=urllib2.urlopen(link)
> ? ? p=u.read()
> ? ? open(filename,"w").write(p)
> [/code]
>
> $ ~/python/downloadjuniper.py
> linkwww.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
> downloading ... mib-jnx-user-aaa.txt
> Traceback (most recent call last):
> ? File "/home/powah/python/downloadjuniper.py", line 20, in ?
> ? ? u=urllib2.urlopen(link)
> ? File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
> ? ? return _opener.open(url, data)
> ? File "/usr/lib/python2.4/urllib2.py", line 350, in open
> ? ? protocol = req.get_type()
> ? File "/usr/lib/python2.4/urllib2.py", line 233, in get_type
> ? ? raise ValueError, "unknown url type: %s" % self.__original
> ValueError: unknown url type:www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
>
> $ python
> Python 2.4.4 (#1, Oct 23 2006, 13:58:00)
> [GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>
>
>
> My computer is FC6 linux.

There's only a couple dozen of them, right-click->Save As. I'm sure
Juniper would appreciate that much more than an automated crawler.

As far as your ValueError is concerned, consider that
'www.juniper.com' doesn't start with a protocol specification when
passed into urllib2.urlopen.

-Jeff
mcjeff.blogspot.com



From __peter__ at web.de  Wed May 27 13:52:25 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 27 May 2009 19:52:25 +0200
Subject: print stream behavior
References: <d73e7eae-42a6-4154-b965-bc3239d3243c@y10g2000prc.googlegroups.com>
Message-ID: <gvjujq$uev$03$1@news.t-online.com>

Andreas Kraemer wrote:

> I don't understand the behavior of the print statement when streaming
> to a "file-like" object. From the documentation at
> http://www.python.org/doc/2.4.4/ref/print.html I understand that the
> file-like object needs to have a write() method that - I assume - is
> called when the print statement is invoked. However, the piece of code
> below does not behave as I expect.
> 
> F subclasses file and overwrites its write() method (simply printing
> out a message and then calling the superclass's write()). Calling
> write directly works as expected, using print does not.
> 
> Can anybody shed some light on what's happening under the hood (or how
> to make it work with "print")?

This is a longstanding quirk of the CPython implementation. The 
PRINT_ITEM_TO opcode triggers a PyFile_WriteObject() call which in turn does 
the C equivalent of

if isinstance(f, file):
   file.write(f, s)
else:
   write = getattr(f, "write")
   write(s)
 
Therefore subclasses of file will always use file.write() when invoked via 
'print'.

You can avoid that by writing a wrapper instead of a subclass:

class File(object):
    def __init__(self, *args):
        self._file = open(*args)
    def write(self, s):
        self._file.write(s)
    # add other methods as needed

Peter



From randall at tnr.cc  Wed May 27 13:57:29 2009
From: randall at tnr.cc (Randall Smith)
Date: Wed, 27 May 2009 12:57:29 -0500
Subject: multiprocessing / forking memory usage
In-Reply-To: <m2octf5zya.fsf@cs.uu.nl>
References: <mailman.771.1243360355.8015.python-list@python.org>
	<m2octf5zya.fsf@cs.uu.nl>
Message-ID: <gvjuu9$niv$1@ger.gmane.org>

Thanks Piet.  You gave a good explanation and I think I understand much 
better now.

Piet van Oostrum wrote:
>>>>>> Randall Smith <randall at tnr.cc> (RS) wrote:
> 
>> RS> I'm trying to get a grasp on how memory usage is affected when forking as
>> RS> the multiprocessing module does.  I've got a program with a parent process
>> RS> using wx and other memory intensive modules. It spawns child processes (by
>> RS> forking) that should be very lean (no wx required, etc). Based on
>> RS> inspection using "ps v" and psutil, the memory usage (rss) is much higher
>> RS> than I would expect for the subprocess.
> 
> The child is a clone of the parent. So both its virtual memory usage and
> its resident memory usage will be equal to the parent's ones immediately
> after the fork(). But the actual physical memory has only one copy
> resident, although ps will show it on both processes (at least I think
> that's how ps works). Of course later they will diverge.
> 
>> RS> My understanding is that COW is used when forking (on Linux).  
> 
> I think this is true of all modern Unix systems.
> 
>> RS> So maybe "ps v pid" is reflecting that. If that's the case, is
>> RS> there a way to better determine the child's memory usage?
>  
> Define `memory usage' in the light of the above.
> 
> As long as the parent is still around and you don't run out of virtual
> memory in the child, not much harm is done.
> 
> If the parent stops and you don't run out of virtual memory in the
> child, the excessive pages will eventually be paged out, and then no
> longer occupy physical memory. As long as you have enough swap space it
> shouldn't be a big problem. The extra paging activity is a bit of a
> loss, however.
> 
> If you run out of virtual memory in the child you have a problem, however.
> 
>> RS> If it's not the case and I'm using
>> RS> modules I don't need, how can I reduce the memory usage to what the child
>> RS> actually uses instead of including everything the parent is using?
> 
> The best would be to fork the child before you import the excess modules
> in the parent. If that is not possible you could try to delete as much
> in the child as you can, for example by
> del wx; del sys.modules['wx'] etc, delete all variables that you don't
> need, and hope the garbage collector will clean up enough. But it will
> make you application quite complicated. From the python level you can't
> get rid of loaded shared libraries, however. And trying to do that from
> the C level is probably close to committing suicide.
> 
> My advise: don't worry until you really experience memory problems.



From akraemer at sbcglobal.net  Wed May 27 14:02:55 2009
From: akraemer at sbcglobal.net (Andreas Kraemer)
Date: Wed, 27 May 2009 11:02:55 -0700 (PDT)
Subject: print stream behavior
References: <d73e7eae-42a6-4154-b965-bc3239d3243c@y10g2000prc.googlegroups.com>
	<gvjujq$uev$03$1@news.t-online.com>
Message-ID: <2e8fc392-c253-490d-b62c-cf060355afc4@d25g2000prn.googlegroups.com>

On May 27, 10:52?am, Peter Otten <__pete... at web.de> wrote:
> This is a longstanding quirk of the CPython implementation. The
> PRINT_ITEM_TO opcode triggers a PyFile_WriteObject() call which in turn does
> the C equivalent of
>
> if isinstance(f, file):
> ? ?file.write(f, s)
> else:
> ? ?write = getattr(f, "write")
> ? ?write(s)
>
> Therefore subclasses of file will always use file.write() when invoked via
> 'print'.
>
> You can avoid that by writing a wrapper instead of a subclass:
>
> class File(object):
> ? ? def __init__(self, *args):
> ? ? ? ? self._file = open(*args)
> ? ? def write(self, s):
> ? ? ? ? self._file.write(s)
> ? ? # add other methods as needed
>
> Peter

Thanks very much! That solves the mystery ...


From wong_powah at yahoo.ca  Wed May 27 14:06:05 2009
From: wong_powah at yahoo.ca (powah)
Date: Wed, 27 May 2009 11:06:05 -0700 (PDT)
Subject: download all mib files from a web page
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
	<82e5df8f-8ff2-4a33-9729-38ff8d777c23@b1g2000vbc.googlegroups.com>
Message-ID: <c6572593-16c8-4198-a340-99ff14a0ad2b@i6g2000yqj.googlegroups.com>

On May 27, 1:50?pm, Jeff McNeil <j... at jmcneil.net> wrote:
> On May 27, 12:29?pm, powah <wong_po... at yahoo.ca> wrote:
>
>
>
>
>
> > I want to download all mib files from the web page:http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-m...
>
> > All mib filenames are of this format:www.juniper.net/techpubs... .txt
>
> > I write this program but has the following error.
> > Please help.
> > Thanks.
>
> > [code]
> > #!/usr/bin/env python
> > import urllib2,os,urlparse
> > url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
> > net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
> > page=urllib2.urlopen(url)
> > f=0
> > links=[]
> > data=page.read().split("\n")
> > for item in data:
> > ? ? if "www.juniper.net/techpubs" in item:
> > ? ? ? ? httpind=item.index("www.juniper.net/techpubs")
> > ? ? ? ? item=item[httpind:]
> > ? ? ? ? #print "item " + item
> > ? ? ? ? ind=item.index("<")
> > ? ? ? ? links.append(item[:ind]) #grab all links
> > # download all links
> > for link in links:
> > ? ? print "link " + link
> > ? ? filename=link.split("/")[-1]
> > ? ? print "downloading ... " + filename
> > ? ? u=urllib2.urlopen(link)
> > ? ? p=u.read()
> > ? ? open(filename,"w").write(p)
> > [/code]
>
> > $ ~/python/downloadjuniper.py
> > linkwww.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
> > downloading ... mib-jnx-user-aaa.txt
> > Traceback (most recent call last):
> > ? File "/home/powah/python/downloadjuniper.py", line 20, in ?
> > ? ? u=urllib2.urlopen(link)
> > ? File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
> > ? ? return _opener.open(url, data)
> > ? File "/usr/lib/python2.4/urllib2.py", line 350, in open
> > ? ? protocol = req.get_type()
> > ? File "/usr/lib/python2.4/urllib2.py", line 233, in get_type
> > ? ? raise ValueError, "unknown url type: %s" % self.__original
> > ValueError: unknown url type:www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
>
> > $ python
> > Python 2.4.4 (#1, Oct 23 2006, 13:58:00)
> > [GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
> > Type "help", "copyright", "credits" or "license" for more information.
>
> > My computer is FC6 linux.
>
> There's only a couple dozen of them, right-click->Save As. I'm sure
> Juniper would appreciate that much more than an automated crawler.
>
> As far as your ValueError is concerned, consider that
> 'www.juniper.com'doesn't start with a protocol specification when
> passed into urllib2.urlopen.
>
> -Jeff
> mcjeff.blogspot.com

Juniper's web page is simple, I am learning python so as to download
files from more complex web page and do other things as well.


From wong_powah at yahoo.ca  Wed May 27 14:06:07 2009
From: wong_powah at yahoo.ca (powah)
Date: Wed, 27 May 2009 11:06:07 -0700 (PDT)
Subject: download all mib files from a web page
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
Message-ID: <ad31d28e-1472-4da6-b704-820435947191@y7g2000yqa.googlegroups.com>

On May 27, 12:29?pm, powah <wong_po... at yahoo.ca> wrote:
> I want to download all mib files from the web page:http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-m...
>
> All mib filenames are of this format:www.juniper.net/techpubs... .txt
>
> I write this program but has the following error.
> Please help.
> Thanks.
>
> [code]
> #!/usr/bin/env python
> import urllib2,os,urlparse
> url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
> net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
> page=urllib2.urlopen(url)
> f=0
> links=[]
> data=page.read().split("\n")
> for item in data:
> ? ? if "www.juniper.net/techpubs" in item:
> ? ? ? ? httpind=item.index("www.juniper.net/techpubs")
> ? ? ? ? item=item[httpind:]
> ? ? ? ? #print "item " + item
> ? ? ? ? ind=item.index("<")
> ? ? ? ? links.append(item[:ind]) #grab all links
> # download all links
> for link in links:
> ? ? print "link " + link
> ? ? filename=link.split("/")[-1]
> ? ? print "downloading ... " + filename
> ? ? u=urllib2.urlopen(link)
> ? ? p=u.read()
> ? ? open(filename,"w").write(p)
> [/code]
>
> $ ~/python/downloadjuniper.py
> linkwww.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
> downloading ... mib-jnx-user-aaa.txt
> Traceback (most recent call last):
> ? File "/home/powah/python/downloadjuniper.py", line 20, in ?
> ? ? u=urllib2.urlopen(link)
> ? File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
> ? ? return _opener.open(url, data)
> ? File "/usr/lib/python2.4/urllib2.py", line 350, in open
> ? ? protocol = req.get_type()
> ? File "/usr/lib/python2.4/urllib2.py", line 233, in get_type
> ? ? raise ValueError, "unknown url type: %s" % self.__original
> ValueError: unknown url type:www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
>
> $ python
> Python 2.4.4 (#1, Oct 23 2006, 13:58:00)
> [GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>
>
>
> My computer is FC6 linux.

I fixed one error, now if the filename is misspelled, how to ignore
the error and continue?
[code]
#!/usr/bin/env python
import urllib2,os,urlparse
url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
page=urllib2.urlopen(url)
f=0
links=[]
data=page.read().split("\n")
for item in data:
    if "www.juniper.net/techpubs" in item:
        httpind=item.index("www.juniper.net/techpubs")
        item=item[httpind:]
        #print "item " + item
        ind=item.index(".txt") + 4
        links.append(item[:ind]) #grab all links
# download all links
for link in links:
    filename=link.split("/")[-1]
    link = "http://" + link
    print "link " + link
    print "downloading ... " + filename
    u=urllib2.urlopen(link)
    p=u.read()
    open(filename,"w").write(p)
[/code]

$ ~/python/downloadjuniper_onepage.py
link http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib-jnx-virtual-chassis.txt
downloading ... mib-jnx-virtual-chassis.txt
Traceback (most recent call last):
  File "/home/powah/python/downloadjuniper_onepage.py", line 7, in ?
    u=urllib2.urlopen(link)
  File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
    return _opener.open(url, data)
  File "/usr/lib/python2.4/urllib2.py", line 364, in open
    response = meth(req, response)
  File "/usr/lib/python2.4/urllib2.py", line 471, in http_response
    response = self.parent.error(
  File "/usr/lib/python2.4/urllib2.py", line 402, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.4/urllib2.py", line 337, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.4/urllib2.py", line 480, in
http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
urllib2.HTTPError: HTTP Error 404: Not Found


From stef.mientki at gmail.com  Wed May 27 14:09:01 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Wed, 27 May 2009 20:09:01 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
Message-ID: <4A1D81BD.3090609@gmail.com>

John Yeung wrote:
> On May 26, 9:43 am, Mel <mwil... at the-wire.com> wrote:
>
>   
>>  SciTE
>> I like one big uncomplicated window, tabbed file panes,
>> syntax coloring and help with indentation.  There's
>> nothing to it I hate.  It would be nice if
>> customization were easier.
>>     
>
> This is a decent summary of SciTE, but I kind of marvel at how few
> people complain about its Python indentation.  (I'd like to think it's
> because anyone who edits Python code in SciTE has downloaded my patch,
> but I am confident that is not the case.)
>   
What's not correct about the Python indentation ?
Where can we find the patch ?

cheers,
Stef
> John
>   



From abolotnov at gmail.com  Wed May 27 14:16:54 2009
From: abolotnov at gmail.com (abolotnov)
Date: Wed, 27 May 2009 11:16:54 -0700 (PDT)
Subject: Building mySQL-python with python 2.6
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>
	<mailman.793.1243429122.8015.python-list@python.org>
	<9-6dnT0O5_7YxYDXnZ2dnUVZ_tti4p2d@pdx.net>
Message-ID: <103438d3-7fdb-4963-b2f1-41bcb41903f4@f19g2000yqh.googlegroups.com>

> You might be able to use mingw32 as well.

say I obtain and install "an alternative" compiler. how do I tell
python which one to use?

I am sorry for asking dumb questions. Can't find the answers in the
docs/mans.


From __peter__ at web.de  Wed May 27 14:19:19 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 27 May 2009 20:19:19 +0200
Subject: List reference at offset
References: <f9bb0329-48ca-4e9e-a20e-4cda1c1e5c91@o5g2000prh.googlegroups.com>
Message-ID: <gvk068$3ju$00$1@news.t-online.com>

Colin.Hankins at touit.com wrote:

> Disclaimer: I'm learning python and would like to use it in a
> project.
> 
> The project will have many large matricies. In one particular instance
> I need to reference a smaller submatrix of the larger matrix. I don't
> want to create a new copy or even change any of the values, I just
> want to quickly and easily be able to look at this sub matrix.
> 
> So I am using lists of lists for the matricies (I am also playing with
> NumPy) and is there anyway to create a pointer to an offset in a
> list?
> 
> I know you can have A = B = [] which would be the same.
> 
> And I know I can simply do a B[x + offset to submatrix].
> 
> But I was hoping there may be a way to just have a pointer? Or is
> there another more efficient method to do this in python?

What you describe is what numpy does:

"""
Therefore, a regular indexing expression on an ndarray can always produce an 
ndarray object without copying any data. This is sometimes referred to as 
the ?view? feature of array indexing, and one can see that it is enabled by 
the use of striding information in the underlying ndarray object. The 
greatest bene?t of this feature is that it allows indexing to be done
very rapidly and without exploding memory usage (because no copies of the 
data are made).
"""





From norseman at hughes.net  Wed May 27 14:29:52 2009
From: norseman at hughes.net (norseman)
Date: Wed, 27 May 2009 11:29:52 -0700
Subject: Python, Tkinter and popen problem
Message-ID: <4A1D86A0.9010104@hughes.net>


This was sent 5/19/09 and as yet has received no comments.
I'm resending just in case a new reader might have an answer.
==================================



I have come across a problem that, as I understand all documentation I
have found, should not exist.

Python version is 2.5.2, Tinker in that package.
Linux Slackware 10.2

I went to test os.popen and got mixed answers.

         1) IF  os.popen opens a command line or command window type
            THEN  the read and writes work as expected
         2) IF  os.popen opens a Tkinter contained python program
            THEN  the read is not consistant and write to it fails.

OK - #1 runs as expected on shell scripts and other programs that were
         written for the keyboard and redirectors only. (non GUI types)

      #2 popen sometimes connects to stdout OF the child and sometimes
         not and has never shown signs of connection to stdin OF child

The Tkinter usage has three (3) print statements. Two (2) never show up.
One does. The one that does is the exit notice.

In the 'child' program;  print, sys.stdout.write(string), and
os.write(stdout,string) all work for the one that does write back, but
none work for the two that do not. Don't get picky on the syntax, the
purpose is to get the message across. (Actual syntax was adjusted per 
documentation in each effort.)


The print statements are:
print "Notice of action"
print VariableHavingTextOfAction

print "Closing down\n"

Yes I tried adding the '\n' to the others - no change.

Same loop reads/prints FROM the child's stdout for all three prints.

All three work fine when Tkinter included program is run 'solo'.
Print statements show up in the text (command, whatever) window.
The entire Tkinter included program runs normally except for the I/O
linkage problem when using os.popen(.....  or Popen2.popen2 or ... then
only third print shows up in text window. Acts as if first two prints
were captured but never forwarded to screen.  If it was a case of not
sending until a system flush() took place then all three lines would
appear at the closing. Yes? That is NOT happening. Only closing notice 
appears.  With master having a print ":",returnVal to verify where the 
text screen notices come from - the final print FROM the child is 
verified as captured and printed from the master.

The child has a pause expecting a keystroke from the master immediately
following the print VariableH...   which apparently is never received. 
It is at this point the child hangs.


Again, it's a Python program running a Python program that uses Tkinter.


So what is going on and what can I do to get things running correctly?
I want the master to echo the child's print statements and the child get
the 'continue' character so it will.

Today is: 20090527
Versions noted above.

Steve


From nad at acm.org  Wed May 27 14:33:38 2009
From: nad at acm.org (Ned Deily)
Date: Wed, 27 May 2009 11:33:38 -0700
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<4A15EF9E.8070406@islandtraining.com>
	<gv4st8$11t$1@ger.gmane.org> <200905271107.21750.kyrie@uh.cu>
Message-ID: <nad-AFD440.11333827052009@news.gmane.org>

In article <200905271107.21750.kyrie at uh.cu>,
 Luis Zarrabeitia <kyrie at uh.cu> wrote:
> On Thursday 21 May 2009 08:50:48 pm R. David Murray wrote:
> > In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
> > point algorithm for Python so that the shortest repr that will round
> > trip correctly is what is used as the floating point repr....
> 
> Little question: what was the goal of such a change? (is there a pep for me 
> to 
> read?)

See discussion starting here:

http://article.gmane.org/gmane.comp.python.devel/103191/

-- 
 Ned Deily,
 nad at acm.org



From lists at cheimes.de  Wed May 27 14:52:51 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 27 May 2009 20:52:51 +0200
Subject: Building mySQL-python with python 2.6
In-Reply-To: <103438d3-7fdb-4963-b2f1-41bcb41903f4@f19g2000yqh.googlegroups.com>
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>	<mailman.793.1243429122.8015.python-list@python.org>	<9-6dnT0O5_7YxYDXnZ2dnUVZ_tti4p2d@pdx.net>
	<103438d3-7fdb-4963-b2f1-41bcb41903f4@f19g2000yqh.googlegroups.com>
Message-ID: <gvk263$2eo$1@ger.gmane.org>

abolotnov wrote:
> say I obtain and install "an alternative" compiler. how do I tell
> python which one to use?
> 
> I am sorry for asking dumb questions. Can't find the answers in the
> docs/mans.

http://docs.python.org/install/index.html#gnu-c-cygwin-mingw

Christian



From __peter__ at web.de  Wed May 27 14:56:20 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 27 May 2009 20:56:20 +0200
Subject: Python, Tkinter and popen problem
References: <mailman.803.1243448972.8015.python-list@python.org>
Message-ID: <gvk2br$6bg$03$1@news.t-online.com>

norseman wrote:

> This was sent 5/19/09 and as yet has received no comments.

> I'm resending just in case a new reader might have an answer.

If you had posted two tiny scripts demonstrating your problem instead of the 
longwinded explanation I might have tinkered.

Peter



From Colin.Hankins at touit.com  Wed May 27 15:02:30 2009
From: Colin.Hankins at touit.com (Colin.Hankins at touit.com)
Date: Wed, 27 May 2009 12:02:30 -0700 (PDT)
Subject: List reference at offset
References: <f9bb0329-48ca-4e9e-a20e-4cda1c1e5c91@o5g2000prh.googlegroups.com>
	<gvk068$3ju$00$1@news.t-online.com>
Message-ID: <3c3d3156-325c-4463-8b86-21d1cc4df60a@r31g2000prh.googlegroups.com>

On May 27, 11:19?am, Peter Otten <__pete... at web.de> wrote:
> Colin.Hank... at touit.com wrote:
> > Disclaimer: I'm learning python and would like to use it in a
> > project.
>
> > The project will have many large matricies. In one particular instance
> > I need to reference a smaller submatrix of the larger matrix. I don't
> > want to create a new copy or even change any of the values, I just
> > want to quickly and easily be able to look at this sub matrix.
>
> > So I am using lists of lists for the matricies (I am also playing with
> > NumPy) and is there anyway to create a pointer to an offset in a
> > list?
>
> > I know you can have A = B = [] which would be the same.
>
> > And I know I can simply do a B[x + offset to submatrix].
>
> > But I was hoping there may be a way to just have a pointer? Or is
> > there another more efficient method to do this in python?
>
> What you describe is what numpy does:
>
> """
> Therefore, a regular indexing expression on an ndarray can always produce an
> ndarray object without copying any data. This is sometimes referred to as
> the ?view? feature of array indexing, and one can see that it is enabled by
> the use of striding information in the underlying ndarray object. The
> greatest bene?t of this feature is that it allows indexing to be done
> very rapidly and without exploding memory usage (because no copies of the
> data are made).
> """- Hide quoted text -
>
> - Show quoted text -

Thank you. That certainly did the trick!


From piet at cs.uu.nl  Wed May 27 15:06:32 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 27 May 2009 21:06:32 +0200
Subject: Multiprocessing problem with producer/consumer
References: <87y6si99t2.fsf@tank.madk.org>
Message-ID: <m27i025ps7.fsf@cs.uu.nl>

>>>>> Wu Zhe <wu at madk.org> (WZ) wrote:

>WZ> I am writing a server program with one producer and multiple consumers,
>WZ> what confuses me is only the first task producer put into the queue gets
>WZ> consumed, after which tasks enqueued no longer get consumed, they remain
>WZ> in the queue forever.

>WZ> from multiprocessing import Process, Pool, Queue, cpu_count
>WZ> from http import httpserv

>WZ> def work(queue):
>WZ>     while True:
>WZ>         task = queue.get()
>WZ>         if task is None:
>WZ>             break
>WZ>         time.sleep(5)
>WZ>         print "task done:", task
>WZ>     queue.put(None)

>WZ> class Manager:
>WZ>     def __init__(self):
>WZ>         self.queue = Queue()
>WZ>         self.NUMBER_OF_PROCESSES = cpu_count()

>WZ>     def start(self):
>WZ>         self.workers = [Process(target=work, args=(self.queue,))
>WZ>                         for i in xrange(self.NUMBER_OF_PROCESSES)]
>WZ>         for w in self.workers
>WZ>             w.start()

>WZ>         httpserv(self.queue)

>WZ>     def reload(self):
>WZ>         print "RELOAD"

>WZ>     def stop(self):
>WZ>         self.queue.put(None)
>WZ>         for i in range(self.NUMBER_OF_PROCESS):
>WZ>             self.workers[i].join()
>WZ>         queue.close()

>WZ> Manager().start()

>WZ> The producer is a HTTP server which put a task in the queue once receive
>WZ> a request from the user. It seems that consumer processes are still
>WZ> blocked when there are new tasks in the queue, which is weird.

How do you know there are still tasks in the queue?

When I replace your httpserv(self.queue) with:

        for i in range(100):
            self.queue.put(i)
it just works. So it seems probable to me that the problem is in
httpserv. Maybe it stalls or maybe it puts a None in the queue? You
could debug by logging the puts in the queue.

>WZ> P.S. Another two questions not relating to the above, I am not sure if
>WZ> it's better to put HTTP server in its own process other than the main
>WZ> process, if yes how can I make the main process keep running before all
>WZ> children processes end. Second question, what's the best way to stop the
>WZ> HTTP server gracefully?

In don't think it is useful to put the HTTP server in its own process as
the Manager process has hardly anything to do. But if you do you can
make it wait by doing the join of the worker processes at the end,
instead of inside the stop().

Stopping the HTTP server: is it multithreaded? You can have a boolean
that indicates it should accept no new requests. Without more info about
the server it is hard to give a more detailed answer.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From clp2 at rebertia.com  Wed May 27 15:11:55 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 27 May 2009 12:11:55 -0700
Subject: download all mib files from a web page
In-Reply-To: <ad31d28e-1472-4da6-b704-820435947191@y7g2000yqa.googlegroups.com>
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
	<ad31d28e-1472-4da6-b704-820435947191@y7g2000yqa.googlegroups.com>
Message-ID: <50697b2c0905271211i641c09absdddcd5c0bc9db121@mail.gmail.com>

On Wed, May 27, 2009 at 11:06 AM, powah <wong_powah at yahoo.ca> wrote:
> On May 27, 12:29?pm, powah <wong_po... at yahoo.ca> wrote:
>> I want to download all mib files from the web page:http://www.juniper.net/techpubs/software/junos/junos94/swconfig-net-m...
>>
>> All mib filenames are of this format:www.juniper.net/techpubs... .txt
>>
>> I write this program but has the following error.
>> Please help.
>> Thanks.
>>
>> [code]
>> #!/usr/bin/env python
>> import urllib2,os,urlparse
>> url="http://www.juniper.net/techpubs/software/junos/junos94/swconfig-
>> net-mgmt/juniper-specific-mibs-junos-nm.html#jN18E19"
>> page=urllib2.urlopen(url)
>> f=0
>> links=[]
>> data=page.read().split("\n")
>> for item in data:
>> ? ? if "www.juniper.net/techpubs" in item:
>> ? ? ? ? httpind=item.index("www.juniper.net/techpubs")
>> ? ? ? ? item=item[httpind:]
>> ? ? ? ? #print "item " + item
>> ? ? ? ? ind=item.index("<")
>> ? ? ? ? links.append(item[:ind]) #grab all links
>> # download all links
>> for link in links:
>> ? ? print "link " + link
>> ? ? filename=link.split("/")[-1]
>> ? ? print "downloading ... " + filename
>> ? ? u=urllib2.urlopen(link)
>> ? ? p=u.read()
>> ? ? open(filename,"w").write(p)
>> [/code]
>>
>> $ ~/python/downloadjuniper.py
>> linkwww.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
>> downloading ... mib-jnx-user-aaa.txt
>> Traceback (most recent call last):
>> ? File "/home/powah/python/downloadjuniper.py", line 20, in ?
>> ? ? u=urllib2.urlopen(link)
>> ? File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
>> ? ? return _opener.open(url, data)
>> ? File "/usr/lib/python2.4/urllib2.py", line 350, in open
>> ? ? protocol = req.get_type()
>> ? File "/usr/lib/python2.4/urllib2.py", line 233, in get_type
>> ? ? raise ValueError, "unknown url type: %s" % self.__original
>> ValueError: unknown url type:www.juniper.net/techpubs/software/junos/junos94/swconfig-net-mgmt/mib...
>>
>> $ python
>> Python 2.4.4 (#1, Oct 23 2006, 13:58:00)
>> [GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>>
>>
>>
>> My computer is FC6 linux.
>
> I fixed one error, now if the filename is misspelled, how to ignore
> the error and continue?

Read the fine tutorial: http://docs.python.org/tutorial/errors.html

Cheers,
Chris
-- 
http://blog.rebertia.com


From Scott.Daniels at Acm.Org  Wed May 27 15:37:05 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 27 May 2009 12:37:05 -0700
Subject: download all mib files from a web page
In-Reply-To: <ad31d28e-1472-4da6-b704-820435947191@y7g2000yqa.googlegroups.com>
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
	<ad31d28e-1472-4da6-b704-820435947191@y7g2000yqa.googlegroups.com>
Message-ID: <Lo2dnbn72r-YCIDXnZ2dnUVZ_rmdnZ2d@pdx.net>

powah wrote:
> ...
> I fixed one error, now if the filename is misspelled, how to ignore
> the error and continue?

You really should go through the tutorial.  It will explain this and
other important things well.  But, since I'm feeling generous:

Replace this:
>     u=urllib2.urlopen(link)
>     p=u.read()
>     open(filename,"w").write(p)
with this:
       try:
           u = urllib2.urlopen(link)
           p = u.read()
       except urllib2.HTTPError:
           pass
       else:
           dest = open(filename, "w")
           dest.write(p)
           dest.close()

--Scott David Daniels
Scott.Daniels at Acm.Org


From kyrie at uh.cu  Wed May 27 15:37:10 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 27 May 2009 15:37:10 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <nad-AFD440.11333827052009@news.gmane.org>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<200905271107.21750.kyrie@uh.cu>
	<nad-AFD440.11333827052009@news.gmane.org>
Message-ID: <200905271537.10336.kyrie@uh.cu>

On Wednesday 27 May 2009 02:33:38 pm Ned Deily wrote:
> In article <200905271107.21750.kyrie at uh.cu>,
>
> > Little question: what was the goal of such a change? (is there a pep for
> > me to
> > read?)
>
> See discussion starting here:
>
> http://article.gmane.org/gmane.comp.python.devel/103191/

Thank you.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From imageguy1206 at gmail.com  Wed May 27 15:58:27 2009
From: imageguy1206 at gmail.com (imageguy)
Date: Wed, 27 May 2009 12:58:27 -0700 (PDT)
Subject: Inheritance and Design Question
Message-ID: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>

I have an object the I would like to use as a base class.  Some of the
methods I would like to override completely, but others I would simply
like to call the base class method and use the return value in the
child method.  The purpose here is to eliminate the duplication of
valuable code in the parent, when I really just need the child to
operate of a results of the parent.

Consider the following two classes;

class Parent(object):
    def process(self, value):
        retval = "Parent.result('%s')" % value
        return retval

class Child(Parent):
    def __init__(self):
        Parent.__init__(self)

    def process(self, value):
        retval = "Child.result('%s')" % super(Child, self).process
(value)
        return retval

So ....

foo = Child()
print foo.process('the value')
>> Child.result('Parent.result('the value')')

IS there another pattern or idiom that would accomplish this?
This seems a bit 'smelly' to me.  Also seems almost the inverse of
decorators, but I am not sure decorators would be appropriate in this
case.

Any help suggestions would be appreciated.

g.


From dickinsm at gmail.com  Wed May 27 16:26:57 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: 27 May 2009 20:26:57 GMT
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<4A15EF9E.8070406@islandtraining.com> <gv4st8$11t$1@ger.gmane.org>
	<mailman.795.1243436849.8015.python-list@python.org>
Message-ID: <4a1da210$0$90265$14726298@news.sunsite.dk>

Luis Zarrabeitia <kyrie at uh.cu> wrote:
> On Thursday 21 May 2009 08:50:48 pm R. David Murray wrote:
> 
>> In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
>> point algorithm for Python so that the shortest repr that will round
>> trip correctly is what is used as the floating point repr....
> 
> Little question: what was the goal of such a change? (is there a pep for me to 
> read?) Shouldn't str() do that, and leave repr as is?

It's a good question.  I was prepared to write a PEP if necessary, but
there was essentially no opposition to this change either in the
python-dev thread that Ned already mentioned, in the bugs.python.org
feature request (see http://bugs.python.org/issue1580; set aside
half-an-hour or so if you want to read this one) or amongst the people
we spoke to at PyCon 2009, so in the end Eric and I just went ahead
and merged the changes.  It didn't harm that Guido supported the idea.

I think the main goal was to see fewer complaints from newbie users
about 0.1 displaying as 0.10000000000000001.  There's no real reason
to produce 17 digits here.  Neither 0.1 nor 0.10000000000000001
displays the true value of the float---both are approximations, so why
not pick the approximation that actually displays nicely.  The only
requirement is that float(repr(x)) recovers x exactly, and since 0.1
produced the float in the first place, it's clear that taking
repr(0.1) to be '0.1' satisfies this requirement.

The problem is particularly acute with the use of the round function,
where newbies complain that round is buggy because it's not rounding
to 2 decimal places:

>>> round(2.45311, 2)
2.4500000000000002

With the new float repr, the result of rounding a float to 2 decimal
places will always display with at most 2 places after the point.
(Well, possibly except when that float is very large.)

Of course, there are still going to be complaints that the following
is rounding in the wrong direction:

>>> round(0.075, 2)
0.07

I'll admit to feeling a bit uncomfortable about the fact that the new
repr goes a little bit further towards hiding floating-point
difficulties from numerically-naive users.

The main things that I like about the new representation is that its
definition is saner (give me the shortest string that rounds
correctly, versus format to 17 places and then somewhat arbitrarily
strip all trailing zeros) and it's more consistent than the old.  With
the current 2.6/3.0 repr (on my machine; your results may vary):

>>> 0.01
0.01
>>> 0.02
0.02
>>> 0.03
0.029999999999999999
>>> 0.04
0.040000000000000001

With Python 3.1:

>>> 0.01
0.01
>>> 0.02
0.02
>>> 0.03
0.03
>>> 0.04
0.04

A cynical response would be to say that the Python 2.6 repr lies only
some of the time; with Python 3.1 it lies *all* of the time.  But
actually all of the above outputs are lies; it's just that the second
set of lies is more consistent and better looking.

There are also a number of significant 'hidden' benefits to using
David Gay's code instead of the system C library's functions, though
those benefits are mostly independent of the choice to use the short
float repr:

- the float repr is much more likely to be consistent across platforms
  (or at least across those platforms using IEEE 754 doubles, which
   seems to be 99.9% percent of them)

- the C library double<->string conversion functions are buggy on many
  platforms (including at least OS X, Windows and some flavours of
  Linux).  While I won't claim that Gay's code (or our adaptation of
  it) is bug-free, I don't know of any bugs (reports welcome!) and at
  least when bugs are discovered it's within our power to fix them.
  Here's one example of an x == eval(repr(x)) failure due to a bug in
  the OS X implementation of strtod:

  >>> x = (2**52-1)*2.**(-1074)
  >>> x
  2.2250738585072009e-308
  >>> y = eval(repr(x))
  >>> y
  2.2250738585072014e-308
  >>> x == y
  False

- similar to the last point: on many platforms string formatting is
  not correctly rounded, in the sense that e.g. '%.6f' % x does not
  necessarily produce the closest decimal with 6 places after the
  decimal point to x.  This is *not* a platform bug, since there's no
  requirement of correct rounding in the C standards.  However, David
  Gay's code does provide correctly rounded string -> double and
  double -> string conversions, so Python's string formatting will now
  always be correctly rounded.  A small thing, but it's nice to have.

- since both round() and string formatting now both use Gay's code, we
  can finally guarantee that round and string formatting give
  equivalent results: e.g., that the digits in round(x, 2) are the
  same as the digits in '%.2f' % x.  That wasn't true before: round
  could round up while '%.2f' % x rounded down (or vice versa) leading
  to confusion and at least one semi-bogus bug report.

- a lot of internal cleanup has become possible as a result of not
  having to worry about all the crazy things that platform string <->
  double conversions can do.  This makes the CPython code smaller,
  clearer, easier to maintain, and less likely to contain bugs.

> While I agree that the change gets rid of the weekly newbie question 
> about "python's lack precision", I'd find more difficult to explain why
> 0.2 * 3 != 0.6 without showing them what 0.2 /really/ means.

There are still plenty of ways to show what 0.2 really means.  My
favourite is to use the Decimal.from_float method:

>>> Decimal.from_float(0.2)
Decimal('0.200000000000000011102230246251565404236316680908203125')

This is only available in 2.7 and 3.1, but then the repr change isn't
happening until 3.1 (and it almost certainly won't be backported to
2.7, by the way), so that's okay.  But there's also float.hex,
float.as_integer_ratio, and Fraction.from_float to show the exact
value that's stored for a float.

>>> 0.2.hex()
'0x1.999999999999ap-3'
>>> Fraction.from_float(0.2)
Fraction(3602879701896397, 18014398509481984)

Hmm.  That was a slightly unfortunate choice of example: the hex form
of 0.2 looks uncomfortably similar to 1.9999999....  An interesting
cross-base accident.

This is getting rather long.  Perhaps I should put the above comments
together into a 'post-PEP' document.

Mark


From Scott.Daniels at Acm.Org  Wed May 27 16:49:23 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 27 May 2009 13:49:23 -0700
Subject: Inheritance and Design Question
In-Reply-To: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
Message-ID: <6eadnbXBDNhqOIDXnZ2dnUVZ_g-dnZ2d@pdx.net>

imageguy wrote:
> I have an object the I would like to use as a base class.  Some of the
> methods I would like to override completely, but others I would simply
> like to call the base class method and use the return value in the
> child method.  The purpose here is to eliminate the duplication of
> valuable code in the parent, when I really just need the child to
> operate of a results of the parent.
> 
> Consider the following two classes;
> 
> class Parent(object):
>     def process(self, value):
>         retval = "Parent.result('%s')" % value
>         return retval
> 
> class Child(Parent):
>     def __init__(self):
>         Parent.__init__(self)
> 
>     def process(self, value):
>         retval = "Child.result('%s')" % super(Child, self).process
> (value)
>         return retval
> 
> So ....
> 
> foo = Child()
> print foo.process('the value')
>>> Child.result('Parent.result('the value')')
> 
> IS there another pattern or idiom that would accomplish this?
> This seems a bit 'smelly' to me.  Also seems almost the inverse of
> decorators, but I am not sure decorators would be appropriate in this
> case.
> 
> Any help suggestions would be appreciated.
> 
> g.
Just don't replace the methods you want to use from the superclass
-- it really is that simple.  Notice how str is changed below,
but not repr:

     class GroupedInt(int):
         def __str__(self):
             old = super(GroupedInt, self).__str__()
             first = old[: len(old) % 3 or 3]
             if first == '-':
                 first = old[: 4]
             parts = [first]
             parts.extend(old[n : n + 3] for n in
                               range(len(first), len(old), 3))
             return '_'.join(parts)

     for n in 1, 12, 123, 1234, 12345, 123456, 1234567:
	print '%s\t%s=%r\t%s=%r' % (n, GroupedInt(n),  GroupedInt(n),
                                        GroupedInt(-n), GroupedInt(-n))

1	1=1	-1=-1
12	12=12	-12=-12
123	123=123	-123=-123
1234	1_234=1234	-1_234=-1234
12345	12_345=12345	-12_345=-12345
123456	123_456=123456	-123_456=-123456
1234567	1_234_567=1234567	-1_234_567=-1234567

--Scott David Daniels
Scott.Daniels at Acm.Org


From mccredie at gmail.com  Wed May 27 16:59:33 2009
From: mccredie at gmail.com (Matimus)
Date: Wed, 27 May 2009 13:59:33 -0700 (PDT)
Subject: Inheritance and Design Question
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
Message-ID: <ba35dd51-aff7-4079-9f0e-dc67463ac5a4@f37g2000pro.googlegroups.com>

On May 27, 12:58?pm, imageguy <imageguy1... at gmail.com> wrote:
> I have an object the I would like to use as a base class. ?Some of the
> methods I would like to override completely, but others I would simply
> like to call the base class method and use the return value in the
> child method. ?The purpose here is to eliminate the duplication of
> valuable code in the parent, when I really just need the child to
> operate of a results of the parent.
>
> Consider the following two classes;
>
> class Parent(object):
> ? ? def process(self, value):
> ? ? ? ? retval = "Parent.result('%s')" % value
> ? ? ? ? return retval
>
> class Child(Parent):
> ? ? def __init__(self):
> ? ? ? ? Parent.__init__(self)
>
> ? ? def process(self, value):
> ? ? ? ? retval = "Child.result('%s')" % super(Child, self).process
> (value)
> ? ? ? ? return retval
>
> So ....
>
> foo = Child()
> print foo.process('the value')
>
> >> Child.result('Parent.result('the value')')
>
> IS there another pattern or idiom that would accomplish this?
> This seems a bit 'smelly' to me. ?Also seems almost the inverse of
> decorators, but I am not sure decorators would be appropriate in this
> case.
>
> Any help suggestions would be appreciated.
>
> g.

>From what you have shown, there really is no _good_ reason to use
inheritance at all. Just delegate (which is the decorator pattern,
different from function decorators).

class Inner(object):
    def process(self, value):
        retval = "Parent.result('%s')" % value
        return retval

class Outer(object):
    def __init__(self, inner):
        self._inner = inner

    def process(self, value):
        retval = "Outer.result('%s')" % self._inner.process(value)
        return retval

This is a silly example, but if you can get the same thing done
without creating a direct dependence between classes then don't. You
will have to construct outer and pass it inner somewhere. If that is a
problem, then just make a factory. In python I implement factories as
just functions most of the time.

The above also encourages reuse. Now you have a decorator that could
be used anywhere.

Matt


From tjreedy at udel.edu  Wed May 27 17:21:23 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 27 May 2009 17:21:23 -0400
Subject: Inheritance and Design Question
In-Reply-To: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
Message-ID: <gvkask$v6$1@ger.gmane.org>

imageguy wrote:
> I have an object the I would like to use as a base class.  Some of the
> methods I would like to override completely, but others I would simply
> like to call the base class method and use the return value in the
> child method.  The purpose here is to eliminate the duplication of
> valuable code in the parent, when I really just need the child to
> operate of a results of the parent.
> 
> Consider the following two classes;
> 
> class Parent(object):
>     def process(self, value):
>         retval = "Parent.result('%s')" % value
>         return retval
> 
> class Child(Parent):
>     def __init__(self):
>         Parent.__init__(self)

Delete this and the parent __init__ is called directly.
> 
>     def process(self, value):
>         retval = "Child.result('%s')" % super(Child, self).process
> (value)
>         return retval

super() was designed for multiple inheritance.  The only reason I know 
to use it with single inheritance it to save a 
global-search-and-replace_with_confirmation if you change the name of 
the parent or change parents.  Unless I really anticipated such 
contigencies, I would probably write Parent.process(self, value).

tjr



From kyrie at uh.cu  Wed May 27 17:24:59 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 27 May 2009 17:24:59 -0400
Subject: 4 hundred quadrillonth?
In-Reply-To: <4a1da210$0$90265$14726298@news.sunsite.dk>
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<mailman.795.1243436849.8015.python-list@python.org>
	<4a1da210$0$90265$14726298@news.sunsite.dk>
Message-ID: <200905271725.00185.kyrie@uh.cu>

On Wednesday 27 May 2009 04:26:57 pm Mark Dickinson wrote:
> Luis Zarrabeitia <kyrie at uh.cu> wrote:
> > On Thursday 21 May 2009 08:50:48 pm R. David Murray wrote:
> >> In py3k Eric Smith and Mark Dickinson have implemented Gay's floating
> >> point algorithm for Python so that the shortest repr that will round
> >> trip correctly is what is used as the floating point repr....
> >
> > Little question: what was the goal of such a change? (is there a pep for
> > me to read?) Shouldn't str() do that, and leave repr as is?
>
> It's a good question.  I was prepared to write a PEP if necessary, but
> there was essentially no opposition to this change either in the
> python-dev thread that Ned already mentioned, in the bugs.python.org
> feature request (see http://bugs.python.org/issue1580; set aside
> half-an-hour or so if you want to read this one) or amongst the people
> we spoke to at PyCon 2009, so in the end Eric and I just went ahead
> and merged the changes.  It didn't harm that Guido supported the idea.

Thank you for the reply and the explanation.
After reading the thread, I was sold on the idea. It still feels weird not 
being able to introduce /that quickly/ the idea of float vs real to newbies, 
but now I understand the tradeoff. 

(Now, I'm going to miss showing that to my students who almost inevitably 
complain about the uselessness of the 'floating point representation' chapter 
in the numerical analysis course :D).

> There are still plenty of ways to show what 0.2 really means.  My
>
> favourite is to use the Decimal.from_float method:
> >>> Decimal.from_float(0.2)
>
> Decimal('0.200000000000000011102230246251565404236316680908203125')

Oh, thank you. That was the next thing I was going to ask.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From descentspb at gmail.com  Wed May 27 17:25:44 2009
From: descentspb at gmail.com (Igor Katson)
Date: Thu, 28 May 2009 01:25:44 +0400
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <m2tz38n0m5.fsf@valheru.db3l.homeip.net>
References: <mailman.1830.1242879003.8014.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>	<4A157AF1.9020104@mrabarnett.plus.com>	<mailman.648.1243147960.8015.python-list@python.org>	<m2y6smm7lw.fsf@valheru.db3l.homeip.net>	<mailman.696.1243233822.8015.python-list@python.org>
	<m2tz38n0m5.fsf@valheru.db3l.homeip.net>
Message-ID: <4A1DAFD8.409@gmail.com>


>
> So in summary, the choices when tested on my system ended up at:
>
>     last             26
>     last-chunk        2.7
>     last-chunk-2      2.3
>     last-popen        1.7
>     last-gzip         1.48
>     last-decompress   1.12
>
> So by being willing to mix in some more direct code with the GzipFile
> object, I was able to beat the overhead of shelling out to the faster
> utilities, while remaining in pure Python.
>
> -- David
>   
Though I didn't need this practically, it was a fantastic reading. 
Gorgeus, David! Thanks for the ultimative post.


From rhodri at wildebst.demon.co.uk  Wed May 27 18:40:27 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 27 May 2009 23:40:27 +0100
Subject: What text editor is everyone using for Python
In-Reply-To: <4a1d628f$0$6471$426a74cc@news.free.fr>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
	<4a1d628f$0$6471$426a74cc@news.free.fr>
Message-ID: <op.uul09plha8ncjz@gnudebst>

On Wed, 27 May 2009 16:56:12 +0100, Bruno Desthuilliers  
<bruno.42.desthuilliers at websiteburo.invalid> wrote:

> Rhodri James a ?crit :
>> On Tue, 26 May 2009 14:22:29 +0100, Roy Smith <roy at panix.com> wrote:
>>
>>> My pet peeve is syntax-aware editors which get things wrong.  For  
>>> example,
>>> the version of emacs I'm using now doesn't parse this properly:
>>>
>>> '''A triple-quoted string.  Some editors won't get this right'''
>>>
>>> The solution is to change the outer quotes to double-quotes, but it  
>>> annoys me when I have to change my code to appease a tool.
>>  It's the separate python-mode that gets this (and much else) wrong.
>> The Python mode that Ubuntu packages with emacs 22.2.1 works just
>> fine.
>
> On this point, indeed. But it also lacks almost every nice feature of  
> the One True python-mode (or at least did last time I had to update this  
> ... ubuntu box at work).

That rather depends on your definition of "nice".  The only feature of
python-mode.el that I miss in python.el is the ability to run pylint from
the menu, and I'll get over that.  The feature that caused me to uninstall
python-mode.el was its bloody-minded determination to regard '_' as a word
character, something which caused me more typing that it ever saved.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From Nikolaus at rath.org  Wed May 27 19:08:25 2009
From: Nikolaus at rath.org (Nikolaus Rath)
Date: Wed, 27 May 2009 19:08:25 -0400
Subject: [pyunit] Only run one specific test
Message-ID: <87k542dtzq.fsf@vostro.rath.org>

Hi,

Consider these two files:

,---- mytest.py -----
| #!/usr/bin/env python
| import unittest
| 
| class myTestCase(unittest.TestCase):
|     def test_foo(self):
| 	pass
| 
| # Somehow important according to pyunit documentation
| def suite():
|     return unittest.makeSuite(myTestCase)
`----

,---- runtest ---
| #!/usr/bin/env python
| import unittest
| 
| # Find and import tests
| modules_to_test =  [ "mytest" ]
| map(__import__, modules_to_test)
| 
| # Runs all tests in test/ directory
| def suite():
|     alltests = unittest.TestSuite()
|     for name in modules_to_test:
|         alltests.addTest(unittest.findTestCases(sys.modules[name]))
|     return alltests
| 
| if __name__ == '__main__':
|     unittest.main(defaultTest='suite')
`----


if I run runtest without arguments, it works. But according to runtest
--help, I should also be able to do

,----
| $ ./runtest mytest
| Traceback (most recent call last):
|   File "./runtest", line 20, in <module>
|     unittest.main()
|   File "/usr/lib/python2.6/unittest.py", line 816, in __init__
|     self.parseArgs(argv)
|   File "/usr/lib/python2.6/unittest.py", line 843, in parseArgs
|     self.createTests()
|   File "/usr/lib/python2.6/unittest.py", line 849, in createTests
|     self.module)
|   File "/usr/lib/python2.6/unittest.py", line 613, in loadTestsFromNames
|     suites = [self.loadTestsFromName(name, module) for name in names]
|   File "/usr/lib/python2.6/unittest.py", line 584, in loadTestsFromName
|     parent, obj = obj, getattr(obj, part)
| AttributeError: 'module' object has no attribute 'mytest'
`----


Why doesn't this work?

Best,

   -Nikolaus


-- 
 ?Time flies like an arrow, fruit flies like a Banana.?

  PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6  02CF A9AD B7F8 AE4E 425C


From norseman at hughes.net  Wed May 27 20:15:03 2009
From: norseman at hughes.net (norseman)
Date: Wed, 27 May 2009 17:15:03 -0700
Subject: Python, Tkinter and popen problem
In-Reply-To: <gvk2br$6bg$03$1@news.t-online.com>
References: <mailman.803.1243448972.8015.python-list@python.org>
	<gvk2br$6bg$03$1@news.t-online.com>
Message-ID: <4A1DD787.3080803@hughes.net>

Peter Otten wrote:
> norseman wrote:
> 
>> This was sent 5/19/09 and as yet has received no comments.
> 
>> I'm resending just in case a new reader might have an answer.
> 
> If you had posted two tiny scripts demonstrating your problem instead of the 
> longwinded explanation I might have tinkered.
> 
> Peter
> 
--------------------------

Since it got lost:
Python 2.5.2 with Tkinter in the download package
Linux Slackware 10.2

That's one of the problems - with Tkinter you don't get tiny files. :)

I have kept working on this and now have it to the point that sending TO 
the child w/Tkinter works.  Getting messages from the child now shows 
that the flush() is not taking place in timely fashion.  ALL print 
statements FROM child do now flush and are shown correctly, but only 
when the child terminates.

Question now is how to force a flush of stdout while the program is 
running with tkinter in use.

tkinter section is   print "string"
                 or   sys.stdout.write("string")
        sys.stdout.flush() fails totally
I don't care how it's flushed as long as it works on whatever machine 
python runs on.


NOTE: program runs perfectly on both Linux and Windows XP Pro when run 
from the keyboard. But not from another python program that wants the 
phone line connected. (stdin/stdout)  Gee... There is never a County 
Lineman when needed is there Glen? :)


Steve


From python at bdurham.com  Wed May 27 20:28:37 2009
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 27 May 2009 20:28:37 -0400
Subject: A fast way to read last line of gzip archive ?
In-Reply-To: <4A1DAFD8.409@gmail.com>
References: <mailman.1830.1242879003.8014.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF6701A2507@enbmail01.lsi.com>
	<4A157AF1.9020104@mrabarnett.plus.com>
	<mailman.648.1243147960.8015.python-list@python.org>
	<m2y6smm7lw.fsf@valheru.db3l.homeip.net>
	<mailman.696.1243233822.8015.python-list@python.org>
	<m2tz38n0m5.fsf@valheru.db3l.homeip.net> <4A1DAFD8.409@gmail.com>
Message-ID: <1243470517.9717.1317548479@webmail.messagingengine.com>

Dave,

Not the OP, but really enjoyed your analysis and solution. Excellent
job!!

Thank you!
Malcolm


From eric.pruitt at gmail.com  Wed May 27 20:39:21 2009
From: eric.pruitt at gmail.com (Eric Pruitt)
Date: Wed, 27 May 2009 19:39:21 -0500
Subject: Popen File I/O
Message-ID: <171e8a410905271739x90c85b5k87417d02c0b45357@mail.gmail.com>

Hello,

I am creating a file-like interface for Popen. Do I need to return True or
False for "isatty()"? I am thinking True but I am not familiar with the
semantics of what defines a tty.

Thanks,
Eric
-------------- next part --------------
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From google at mrabarnett.plus.com  Wed May 27 20:39:36 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 28 May 2009 01:39:36 +0100
Subject: Python, Tkinter and popen problem
In-Reply-To: <4A1DD787.3080803@hughes.net>
References: <mailman.803.1243448972.8015.python-list@python.org>	<gvk2br$6bg$03$1@news.t-online.com>
	<4A1DD787.3080803@hughes.net>
Message-ID: <4A1DDD48.6080303@mrabarnett.plus.com>

norseman wrote:
> Peter Otten wrote:
>> norseman wrote:
>>
>>> This was sent 5/19/09 and as yet has received no comments.
>>
>>> I'm resending just in case a new reader might have an answer.
>>
>> If you had posted two tiny scripts demonstrating your problem instead 
>> of the longwinded explanation I might have tinkered.
>>
>> Peter
>>
> --------------------------
> 
> Since it got lost:
> Python 2.5.2 with Tkinter in the download package
> Linux Slackware 10.2
> 
> That's one of the problems - with Tkinter you don't get tiny files. :)
> 
[snip]

You're more likely to get help if you provide the minimum code that
demonstrates the problem.

Anyway, your original post said that you're running the child with
os.popen. The documentation says:

"""Open a pipe to or from command. The return value is an open file
object connected to the pipe, which can be read or written depending on
whether mode is 'r' (default) or 'w'."""

In other words, it's one-way.

Are you really using os.popen and not, say, os.popen2?

(Providing actual code would make this clear.)


From darcy at druid.net  Wed May 27 20:53:16 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 27 May 2009 20:53:16 -0400
Subject: Popen File I/O
In-Reply-To: <171e8a410905271739x90c85b5k87417d02c0b45357@mail.gmail.com>
References: <171e8a410905271739x90c85b5k87417d02c0b45357@mail.gmail.com>
Message-ID: <20090527205316.a42b10c6.darcy@druid.net>

On Wed, 27 May 2009 19:39:21 -0500
Eric Pruitt <eric.pruitt at gmail.com> wrote:

> I am creating a file-like interface for Popen. Do I need to return True or
> False for "isatty()"? I am thinking True but I am not familiar with the
> semantics of what defines a tty.

>>> import os
>>> x = os.popen("ls")       
>>> type(x)
<type 'file'>
>>> x.isatty()
False

So what does "creating a file-like interface for Popen" entail?  Popen
already creates a file object.  As for your question, If the object is
reading from a TTY then isatty() is True.  What exactly is your
confusion?

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From thebiggestbangtheory at gmail.com  Wed May 27 21:10:22 2009
From: thebiggestbangtheory at gmail.com (thebiggestbangtheory at gmail.com)
Date: Wed, 27 May 2009 18:10:22 -0700 (PDT)
Subject: newbie: popen question
Message-ID: <328e5cd4-bc4e-47bf-b8e2-91764351c525@g22g2000pra.googlegroups.com>

hello everyone :-),
                         I am a newbie to python. I am trying to run a
bash script from within a python program. I would greatly appreciate
any pointers/comments about how to get around the problem I am facing.

I want to run  bash script: code.sh from within a python program.
code.sh needs to be run like so from the command line
[code]
$ sudo code.sh arg1 arg2
[/code]

I read up on some documentation but am not very clear about how to use
popen. I want to relegate the shell to a background process, but it
needs to accept the sudo passwd too!

I have tried
[code]
p = subprocess.Popen(['/bin/bash', 'sudo '+mypath+'code.sh '+arg1+'
'+arg2],
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.STDOUT)
[/code]
I tried some code from stackoverflow.com/questions/694000/why-doesnt-
subprocess-popen-always-return

nothing really happens when this executes, the PIPE option pshes it to
the background and I can't push in the sudo passwd. Can someone please
give me an idea of how to go about this.

To recap, I want to run a shell script, which needs to be started with
sudo, and then push it into the background.

Thanks,
-A


From ldo at geek-central.gen.new_zealand  Wed May 27 21:12:57 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 28 May 2009 13:12:57 +1200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
Message-ID: <gvkoep$oii$3@lust.ihug.co.nz>

In message <784h2cF1kem0kU1 at mid.uni-berlin.de>, Diez B. Roggisch wrote:

> Lawrence D'Oliveiro wrote:
> 
>> In message <mailman.766.1243354300.8015.python-list at python.org>, Dennis
>> Lee Bieber wrote:
>> 
>>> Notice that db.literal() call? That's part of the mechanism used to
>>> escape and quote parameters -- it only returns strings that are safe for
>>> insertion into the SQL statement.
>> 
>> Does it deal with "like"-wildcards?
> 
> Why shouldn't it?
> 
> cursor.execute("select * from table where column like %s", "%name%")

What if the string you're searching for includes a "%" or "_" character?



From gallium.arsenide at gmail.com  Wed May 27 21:41:51 2009
From: gallium.arsenide at gmail.com (John Yeung)
Date: Wed, 27 May 2009 18:41:51 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
Message-ID: <ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>

On May 27, 2:09?pm, Stef Mientki <stef.mien... at gmail.com> wrote:

> John Yeung wrote:
>
> > I kind of marvel at how few people complain about [SciTE's]
> > Python indentation. ?(I'd like to think it's because anyone
> > who edits Python code in SciTE has downloaded my patch, but
> > I am confident that is not the case.)
>
> What's not correct about the Python indentation ?
> Where can we find the patch ?

If you have used SciTE for Python and haven't been frustrated by the
autoindentation, then I don't think there is much reason for you to
bother with a patch.  By autoindentation, I mean automatically adding
a level when a new block starts, not merely maintaining indentation
level (which virtually every editor does, and some even call this
their "autoindentation" feature).

The problem with SciTE's autoindentation for Python is that you can
only choose from the following three behaviors:

1.  Add a level if you press Enter on a line containing a "live" colon
(that is, one that's not in a string or comment).  [Try not to use
slices except on the same line as a block-initiating 'for', 'if',
etc.]

2.  Add a level if you press Enter on a line containing selected
keywords like 'if', 'for', 'while', 'def', etc.  [Avoid list
comprehensions and generator expressions.  You can do everything with
map, filter, and lambda, right?]

3.  Don't autoindent at all (maintain the current indentation only).

It boggles the mind that there is no way to tell SciTE "only pay
attention to the colon if it's at the end of the line" other than by
modifying the source code, but there you have it.  (It's not like
choice 3 is actually that bad.  I imagine that is what SciTE's author
uses for Python.)

My patch (which also fixes a couple of other indentation-related
things that were driving me crazy) is here:

  http://groups.google.com/group/scite-interest/files

in the file called Python_AutoIndent.cxx.

John


From sjmachin at lexicon.net  Wed May 27 21:48:12 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 27 May 2009 18:48:12 -0700 (PDT)
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org> 
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de> 
	<gvkoep$oii$3@lust.ihug.co.nz>
Message-ID: <0dcfcb4a-8844-420b-b2e2-c8e68419774d@p6g2000pre.googlegroups.com>

On May 28, 11:12?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <784h2cF1kem0... at mid.uni-berlin.de>, Diez B. Roggisch wrote:
>
> > Lawrence D'Oliveiro wrote:
>
> >> In message <mailman.766.1243354300.8015.python-l... at python.org>, Dennis
> >> Lee Bieber wrote:
>
> >>> Notice that db.literal() call? That's part of the mechanism used to
> >>> escape and quote parameters -- it only returns strings that are safe for
> >>> insertion into the SQL statement.
>
> >> Does it deal with "like"-wildcards?
>
> > Why shouldn't it?
>
> > cursor.execute("select * from table where column like %s", "%name%")
>
> What if the string you're searching for includes a "%" or "_" character?

AFAIK:
The LIKE argument is a just any ol' string expression.
The wrapper neither knows nor cares that it is a LIKE argument.
All the wrapper will do when presented with a string value is to quote
apostrophes if needed so that the result is a valid SQL literal e.g.
'O''Brien'
If you need to escape % or _ in a LIKE argument, do whatever the host
convention is.
E.g. you are searching for text that contains literally "5% discount",
with SQLite you could do:
[avoiding backslashes and concomitant confusion]
  LIKE '%5~% discount%' ESCAPE '~'
on the command line, so using DB-API:
  like_expr = user_input.replace("~", "~~").replace("%", "~%").replace
(etc etc)
  cursor.execute(
     "... LIKE ? ESCAPE '~' ...",
     (..., like_expr, ...)
     )

HTH,
John


From cjns1989 at gmail.com  Wed May 27 22:34:45 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Wed, 27 May 2009 22:34:45 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
Message-ID: <20090528023445.GE2896@turki.gavron.org>

I'm unsure about a python editor for everyone but since acquiring habits
takes time, I'm in favor of sticking to one editor for everything.

CJ


From van.lindberg at gmail.com  Wed May 27 23:18:29 2009
From: van.lindberg at gmail.com (VanL)
Date: Wed, 27 May 2009 22:18:29 -0500
Subject: Searching for pyvm
In-Reply-To: <4A19D61D.6020409@acm.org>
References: <4A19D61D.6020409@acm.org>
Message-ID: <4A1E0285.6050200@gmail.com>

Vladimir G. Ivanovic wrote:
> I'm looking for the sources to pyvm, a python virtual machine
> implementation which can run Python 2.4 bytecode.

The tarball for pyvm returns a 404, but you can still get the code to
pyvm by getting archive.org's copy:

http://web.archive.org/web/20061012230953/http://students.ceid.upatras.gr/~sxanth/pyvm/pyvm-1.2.tar.bz2

Thanks,

Van



From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 00:06:25 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 04:06:25 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
Message-ID: <0039e83c$0$9673$c3e8da3@news.astraweb.com>

On Wed, 27 May 2009 22:34:45 -0400, Chris Jones wrote:

> I'm unsure about a python editor for everyone but since acquiring habits
> takes time, I'm in favor of sticking to one editor for everything.

Or use an editor which follows user interface standards, rather than 
invents its own conventions for everything. That way you can trivially 
swap from one compliant application to another compliant application.

A good UI standard should mean that:

* common tasks should use the same interface in any application that 
supports that task;

* all functionality should be discoverable without reading the manual;

* the most common functions should be _trivially_ discoverable;

* don't penalise the user for mistakes: as few actions as possible should 
be irreversible, and those which are irreversible should _effectively_ 
warn the user that they are irreversible;

* simple interfaces are better than complicated interfaces (easy tasks 
should be easy to perform);

* but dumbing-down is not the same as simplifying (complicated tasks 
should be possible);

* if possible, all functionality should be capable of being performed by 
either the mouse or keyboard.


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 00:06:39 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 04:06:39 GMT
Subject: Inheritance and Design Question
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
	<mailman.807.1243459299.8015.python-list@python.org>
Message-ID: <0039e849$0$9673$c3e8da3@news.astraweb.com>

On Wed, 27 May 2009 17:21:23 -0400, Terry Reedy wrote:

> super() was designed for multiple inheritance.

Surely you mean that super() was designed for *inheritance*, multiple or 
singular? Working with single inheritance is part of the design, not an 
accident of implementation.


> The only reason I know
> to use it with single inheritance it to save a
> global-search-and-replace_with_confirmation if you change the name of
> the parent or change parents.

How about these reasons?

(1) If you're subclassing something you didn't write, you might not know 
whether it uses multiple or single inheritance.

(2) Even if you do know, you shouldn't care what the implementation of 
the parent is. Using super() allows you to be agnostic about the 
implementation, while calling Parent.method() directly ties you to a 
specific implementation.

(3) Your callers may want to inherit from your class, and if you fail to 
use super, you are condemning them to potentially buggy code if they use 
multiple inheritance.

(4) Using super() is no harder than avoiding super(). It takes a few 
extra characters to type, at worst:

super(MyClass, self).method(args)
Parent.method(self, args)


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 00:07:00 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 04:07:00 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de>
	<02204669$0$25303$c3e8da3@news.astraweb.com>
	<kkb00q.g62@spenarnc.xs4all.nl>
Message-ID: <0039e85f$0$9673$c3e8da3@news.astraweb.com>

On Wed, 27 May 2009 12:58:02 +0000, Albert van der Horst wrote:

>>And how is reduce() supposed to know whether or not some arbitrary
>>function is commutative?
> 
> Why would it or need it? A Python that understands the ``par'' keyword
> is supposed to know it can play some tricks with optimizing reduce() if
> the specific function is commutative.

Fine. Move the smarts out of reduce() into the compiler. How is the 
compiler supposed to know if an arbitrary function is commutative?



-- 
Steven


From paul.nospam at rudin.co.uk  Thu May 28 01:24:56 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Thu, 28 May 2009 06:24:56 +0100
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
	<4a1d628f$0$6471$426a74cc@news.free.fr>
	<mailman.810.1243464033.8015.python-list@python.org>
Message-ID: <87fxep6bpz.fsf@rudin.co.uk>

"Rhodri James" <rhodri at wildebst.demon.co.uk> writes:

> The feature that caused me to uninstall python-mode.el was its
> bloody-minded determination to regard '_' as a word character,
> something which caused me more typing that it ever saved.

Probably you could have changed this in a few minutes. Or does fiddling
with emacs lisp invalidate your python programmer's licence? ;-)



From rylesny at gmail.com  Thu May 28 01:34:26 2009
From: rylesny at gmail.com (ryles)
Date: Wed, 27 May 2009 22:34:26 -0700 (PDT)
Subject: unpickling a stream
References: <3efc7aa5-c9b7-4755-bd5f-a4e87518d423@x5g2000yqk.googlegroups.com>
Message-ID: <b303feff-e4bf-4b91-b94f-15f772ca9c78@q16g2000yqg.googlegroups.com>

On May 26, 3:25?pm, mso... at linuxmail.org wrote:
> Hello,
>
> I want to send a stream of pickled objects over a socket. ?Is there a
> standard way of ensuring that only complete objects are unpickled on
> the receiving side.
>
> client pseudo code:
> ? loop forever:
> ? ? receive some bytes on the socket
> ? ? if we have received a complete pickled object: ?<== How is this
> done?
> ? ? ? unpickle the object
>
> This isn't for a project, just trying to learn some more about the
> pickle module.
>
> Mike

If you'd like, you can turn a socket into a file-like object using its
makefile() method. An Unpickler will know when to stop reading from
the file (there's a STOP character in the pickle format). David
Beazley gives an example of this approach in Part 7 of "Generator
Tricks for Systems Programmers": http://www.dabeaz.com/generators/Generators.pdf


From andreengels at gmail.com  Thu May 28 01:53:17 2009
From: andreengels at gmail.com (Andre Engels)
Date: Thu, 28 May 2009 07:53:17 +0200
Subject: Inheritance and Design Question
In-Reply-To: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
Message-ID: <6faf39c90905272253o30273b38v4155e7694aa2fec0@mail.gmail.com>

On Wed, May 27, 2009 at 9:58 PM, imageguy <imageguy1206 at gmail.com> wrote:
> I have an object the I would like to use as a base class. ?Some of the
> methods I would like to override completely, but others I would simply
> like to call the base class method and use the return value in the
> child method. ?The purpose here is to eliminate the duplication of
> valuable code in the parent, when I really just need the child to
> operate of a results of the parent.
>
> Consider the following two classes;
>
> class Parent(object):
> ? ?def process(self, value):
> ? ? ? ?retval = "Parent.result('%s')" % value
> ? ? ? ?return retval
>
> class Child(Parent):
> ? ?def __init__(self):
> ? ? ? ?Parent.__init__(self)
>
> ? ?def process(self, value):
> ? ? ? ?retval = "Child.result('%s')" % super(Child, self).process
> (value)
> ? ? ? ?return retval
>
> So ....
>
> foo = Child()
> print foo.process('the value')
>>> Child.result('Parent.result('the value')')
>
> IS there another pattern or idiom that would accomplish this?
> This seems a bit 'smelly' to me. ?Also seems almost the inverse of
> decorators, but I am not sure decorators would be appropriate in this
> case.

I think I would split out the calculation into two methods in this case:

class Parent(object):
    def process_essential(self,value):
        retval = "Parent.result('%s')" % value
        return retval

    def processs(self,value):
        return process_essential(value)

class Child(Parent):
    def process(self,value):
        retval = "Child.result('%s')" % process_essential(value)
        return retval


-- 
Andr? Engels, andreengels at gmail.com


From sisibley at gmail.com  Thu May 28 02:25:53 2009
From: sisibley at gmail.com (Scott Sibley)
Date: Thu, 28 May 2009 01:25:53 -0500
Subject: Resize ctypes array
Message-ID: <cb4d391b0905272325h7b81f40fn1c506e8fd837df17@mail.gmail.com>

I'd like to resize a ctypes array. As you can see, ctypes.resize doesn't
work like it could. I can write a function to resize an array, but I wanted
to know some other solutions to this. Maybe I'm missing some ctypes trick or
maybe I simply used resize wrong. The name c_long_Array_0 seems to tell me
this may not work like I want. What is resize meant for?

>>> from ctypes import *
>>> c_int * 0
<class '__main__.c_long_Array_0'>
>>> intType = c_int * 0
>>> foo = intType()
>>> foo
<__main__.c_long_Array_0 object at 0xb7ed9e84>
>>> foo[0]
Traceback (most recent call last):

  File "<stdin>", line 1, in <module>
IndexError: invalid index
>>> resize(foo, sizeof(c_int * 1))
>>> foo[0]
Traceback (most recent call last):

  File "<stdin>", line 1, in <module>
IndexError: invalid index
>>> foo
<__main__.c_long_Array_0 object at 0xb7ed9e84>

Maybe go with something like:

>>> ctypes_resize = resize
>>> def resize(arr, type):
...     tmp = type()
...     for i in range(len(arr)):
...         tmp[i] = arr[i]
...     return tmp
...
...
>>> listType = c_int * 0
>>> list = listType()
>>> list = resize(list, c_int * 1)
>>> list[0]
0
>>>


But that's ugly passing the type instead of the size. It works for its
purpose and that's it.
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From tiskanto at gmail.com  Thu May 28 02:32:10 2009
From: tiskanto at gmail.com (Teguh Iskanto)
Date: Thu, 28 May 2009 16:32:10 +1000
Subject: DB-API execute params, am I missing something?
In-Reply-To: <gvkoep$oii$3@lust.ihug.co.nz>
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
	<gvkoep$oii$3@lust.ihug.co.nz>
Message-ID: <e137e8260905272332p2f3bde87q68fd2a2b2ee1991e@mail.gmail.com>

On Thu, May 28, 2009 at 11:12 AM, Lawrence D'Oliveiro
<ldo at geek-central.gen.new_zealand> wrote:

> In message <784h2cF1kem0kU1 at mid.uni-berlin.de>, Diez B. Roggisch wrote:
>
> > Lawrence D'Oliveiro wrote:
> >
> >> In message <mailman.766.1243354300.8015.python-list at python.org>, Dennis
> >> Lee Bieber wrote:
> >>
> >>> Notice that db.literal() call? That's part of the mechanism used to
> >>> escape and quote parameters -- it only returns strings that are safe
> for
> >>> insertion into the SQL statement.
> >>
> >> Does it deal with "like"-wildcards?
> >
> > Why shouldn't it?
> >
> > cursor.execute("select * from table where column like %s", "%name%")
>
> What if the string you're searching for includes a "%" or "_" character?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

>>> A="0"
>>> B="%"
>>>
>>> print "select * from test_table where a like '%%%s%%' " %A
select * from test_table where a like '%0%'
>>>
>>> print "select * from test_table where a like '%%%s%%' " %B
select * from test_table where a like '%%%'
>>>

HTH
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From pavlovevidence at gmail.com  Thu May 28 02:44:39 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 27 May 2009 23:44:39 -0700 (PDT)
Subject: Inheritance and Design Question
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
Message-ID: <98be0fe7-9e6f-4015-9374-7b62538ea933@v23g2000pro.googlegroups.com>

On May 27, 12:58?pm, imageguy <imageguy1... at gmail.com> wrote:
> I have an object the I would like to use as a base class. ?Some of the
> methods I would like to override completely, but others I would simply
> like to call the base class method and use the return value in the
> child method. ?The purpose here is to eliminate the duplication of
> valuable code in the parent, when I really just need the child to
> operate of a results of the parent.
>
> Consider the following two classes;
>
> class Parent(object):
> ? ? def process(self, value):
> ? ? ? ? retval = "Parent.result('%s')" % value
> ? ? ? ? return retval
>
> class Child(Parent):
> ? ? def __init__(self):
> ? ? ? ? Parent.__init__(self)
>
> ? ? def process(self, value):
> ? ? ? ? retval = "Child.result('%s')" % super(Child, self).process
> (value)
> ? ? ? ? return retval
>
> So ....
>
> foo = Child()
> print foo.process('the value')
>
> >> Child.result('Parent.result('the value')')
>
> IS there another pattern or idiom that would accomplish this?
> This seems a bit 'smelly' to me. ?Also seems almost the inverse of
> decorators, but I am not sure decorators would be appropriate in this
> case.

I see nothing wrong with it, although if it is possible and convenient
to rename the base class method, as Andre Engels suggests, then that's
usually how I'd do it.

Sometimes it's not convenient to choose a different name for the base
class method, such as when you have several subclasses, most of which
don't override the method, but a few do.  In that case I'd do it same
way as you did.

One thing that does smell is your use of both old-style base class
access (Parent.__init__(self)) and newer-style (super
(Child,self).process()) in the same class.  Pick one method and stick
with it.


Carl Banks


From sisibley at gmail.com  Thu May 28 02:50:01 2009
From: sisibley at gmail.com (Scott Sibley)
Date: Thu, 28 May 2009 01:50:01 -0500
Subject: Resize ctypes array
In-Reply-To: <cb4d391b0905272325h7b81f40fn1c506e8fd837df17@mail.gmail.com>
References: <cb4d391b0905272325h7b81f40fn1c506e8fd837df17@mail.gmail.com>
Message-ID: <cb4d391b0905272350i1c23b7d6j9aab340ad577c9fc@mail.gmail.com>

I found an answer to this over on Stackoverflow.
http://stackoverflow.com/questions/919369/resize-ctypes-array

On Thu, May 28, 2009 at 1:25 AM, Scott Sibley <sisibley at gmail.com> wrote:

> I'd like to resize a ctypes array. As you can see, ctypes.resize doesn't
> work like it could. I can write a function to resize an array, but I wanted
> to know some other solutions to this. Maybe I'm missing some ctypes trick or
> maybe I simply used resize wrong. The name c_long_Array_0 seems to tell me
> this may not work like I want. What is resize meant for?
>
> >>> from ctypes import *
> >>> c_int * 0
> <class '__main__.c_long_Array_0'>
>
> >>> intType = c_int * 0
> >>> foo = intType()
> >>> foo
> <__main__.c_long_Array_0 object at 0xb7ed9e84>
> >>> foo[0]
> Traceback (most recent call last):
>
>
>   File "<stdin>", line 1, in <module>
>
> IndexError: invalid index
> >>> resize(foo, sizeof(c_int * 1))
>
> >>> foo[0]
> Traceback (most recent call last):
>
>
>   File "<stdin>", line 1, in <module>
>
> IndexError: invalid index
> >>> foo
> <__main__.c_long_Array_0 object at 0xb7ed9e84>
>
>
> Maybe go with something like:
>
> >>> ctypes_resize = resize
> >>> def resize(arr, type):
>
> ...     tmp = type()
> ...     for i in range(len(arr)):
>
> ...         tmp[i] = arr[i]
> ...     return tmp
> ...
> ...
> >>> listType = c_int * 0
> >>> list = listType()
> >>> list = resize(list, c_int * 1)
>
> >>> list[0]
> 0
> >>>
>
>
> But that's ugly passing the type instead of the size. It works for its purpose and that's it.
>
>
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From mobiledreamers at gmail.com  Thu May 28 03:05:40 2009
From: mobiledreamers at gmail.com (mobiledreamers at gmail.com)
Date: Thu, 28 May 2009 00:05:40 -0700
Subject: How do you serve Cheetah in production? webpy+cheetah
Message-ID: <c1870d60905280005v181aa8f9lda0d3903650bdd11@mail.gmail.com>

How do you serve *Cheetah* in *production*?

Guys can you share the setup on how to precompile and serve cheetah in
production

Since we dont compile templates in webpy it is getting upstream time out
errors. If you could share a good best practise it would help

*

Jeremy jeremy.james at gmail.com wrote: For a production site, I use Cheetah
with pre-compiled templates - it's very fast (the templates import
especially quickly when python compiled and optimised). A bit of magic with
the imp module takes a template name and a base directory (configured in a
site-specific config) and loads up that template, taking care of #extends
and
import directives as appropriate. I don't use the built-in support for

Cheetah, however. The new template library is also only imported to display
the debugerror page


-- 
Bidegg worlds best auction site
http://bidegg.com
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From ejohnso9 at earthlink.net  Thu May 28 03:49:30 2009
From: ejohnso9 at earthlink.net (Erik Johnson)
Date: Thu, 28 May 2009 00:49:30 -0700 (PDT)
Subject: Building PIL under Cygwin & Python 2.5
Message-ID: <c056aa87-8f61-497b-ac46-065fd2bca9ae@w35g2000prg.googlegroups.com>

This has apparently been a problematic thing for a while now, as the
following article indicates.  I first ran into the error message about
not being able to remap C:\cygwin\bin\tk84.dll to be the same address
as it's parent.

Using that information, Google helped me find this article:
http://blog.datahammer.info/2008/11/install-pil-under-cygwin-python-25.html

After following it's advice and running:
$ ./rebase -b 0x1000000000 tk84.dll

I was able to get the PIL build to proceed, but when it was done, it
said that there was no support built for Tk, and I then noticed that
basic Tkinter functionality was broken from the Python interpreter.

I went back to Cygwin setup, and had it reinstall the tcl/tk package,
and then Tkinter (import from the interactive interp.) got fixed.

Googling some more, I found this article (which implied datahammer
isn't quite right):  http://www.pythonchallenge.com/forums/viewtopic.php?t=135

I ran /usr/bin/rebaseall (from ash)(and if you end up doing this
yourself, be aware that it takes a while - I was afraid that process
had hung and I was going to have to rebuild the whole Cygwin shooting
match from scratch, but it eventually completed (silently)).

After this, I checked that Tkinter still worked from Python (it did),
and then tore out the whole PIL directory (Imaging-1.1.6) I had tried
to install from before, re-extracted the tar file to get a clean
install directory, and then again attempted to build PIL.  Now,
instead of getting the failure message about not being able to remap
the dll, the build just hangs:

$ python setup.py build_ext -i
running build_ext
building '_imaging' extension
creating build
creating build/temp.cygwin-1.5.25-i686-2.5
creating build/temp.cygwin-1.5.25-i686-2.5/libImaging
gcc -fno-strict-aliasing -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-
prototypes -DHAVE_LIBJPEG -DHAVE_LIBZ -I/usr/include/freetype2 -
IlibImaging -I/usr/include -I/home/ej/python/PIL/jpeg-6b -I/usr/
include/python2.5 -c _imaging.c -o build/temp.cygwin-1.5.25-i686-2.5/
_imaging.o

<eventually hit CTRL-C to leave>

Now, I'm rather stuck and I'm thinking "This really shouldn't be that
hard."

So, rebasing (rebaseall'ing) the cygwin system as outlined in the
datahammer blog entry (along with the ash advice of the pychallenge
article) still doesn't seem to be enough to get a clean build.

I think this is an issue that probably needs to be addressed by PIL
maintainers that fully understand the root of the problem (and it
should probably go in the PIL FAQ), but in the meantime does anyone
out there know how to get around this issue?

Thanks,
-ej


From half.italian at gmail.com  Thu May 28 04:11:17 2009
From: half.italian at gmail.com (Sean DiZazzo)
Date: Thu, 28 May 2009 01:11:17 -0700 (PDT)
Subject: newbie: popen question
References: <328e5cd4-bc4e-47bf-b8e2-91764351c525@g22g2000pra.googlegroups.com>
Message-ID: <75004846-9f60-401f-9a7b-adbc28add28b@x31g2000prc.googlegroups.com>

On May 27, 6:10?pm, thebiggestbangthe... at gmail.com wrote:
> hello everyone :-),
> ? ? ? ? ? ? ? ? ? ? ? ? ?I am a newbie to python. I am trying to run a
> bash script from within a python program. I would greatly appreciate
> any pointers/comments about how to get around the problem I am facing.
>
> I want to run ?bash script: code.sh from within a python program.
> code.sh needs to be run like so from the command line
> [code]
> $ sudo code.sh arg1 arg2
> [/code]
>
> I read up on some documentation but am not very clear about how to use
> popen. I want to relegate the shell to a background process, but it
> needs to accept the sudo passwd too!
>
> I have tried
> [code]
> p = subprocess.Popen(['/bin/bash', 'sudo '+mypath+'code.sh '+arg1+'
> '+arg2],
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? stdout=subprocess.PIPE,
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? stderr=subprocess.STDOUT)
> [/code]
> I tried some code from stackoverflow.com/questions/694000/why-doesnt-
> subprocess-popen-always-return
>
> nothing really happens when this executes, the PIPE option pshes it to
> the background and I can't push in the sudo passwd. Can someone please
> give me an idea of how to go about this.
>
> To recap, I want to run a shell script, which needs to be started with
> sudo, and then push it into the background.
>
> Thanks,
> -A

Your best bet is to make sudo not ask for a password.  :)  If you
don't have the rights, then you can use pexpect to do what you want to
do.  http://pexpect.sourceforge.net/pexpect.html

See the second example on that page.

child = pexpect.spawn('scp foo myname at host.example.com:.')
child.expect ('Password:')
child.sendline (mypassword)

~Sean


From jeremiah.dodds at gmail.com  Thu May 28 04:25:06 2009
From: jeremiah.dodds at gmail.com (Jeremiah Dodds)
Date: Thu, 28 May 2009 09:25:06 +0100
Subject: newbie: popen question
In-Reply-To: <75004846-9f60-401f-9a7b-adbc28add28b@x31g2000prc.googlegroups.com>
References: <328e5cd4-bc4e-47bf-b8e2-91764351c525@g22g2000pra.googlegroups.com>
	<75004846-9f60-401f-9a7b-adbc28add28b@x31g2000prc.googlegroups.com>
Message-ID: <12cbbbfc0905280125u757ce8c3u3300361d15233105@mail.gmail.com>

On Thu, May 28, 2009 at 9:11 AM, Sean DiZazzo <half.italian at gmail.com>wrote:

> On May 27, 6:10 pm, thebiggestbangthe... at gmail.com wrote:
> > hello everyone :-),
> >                          I am a newbie to python. I am trying to run a
> > bash script from within a python program. I would greatly appreciate
> > any pointers/comments about how to get around the problem I am facing.
> >
> > I want to run  bash script: code.sh from within a python program.
> > code.sh needs to be run like so from the command line
> > [code]
> > $ sudo code.sh arg1 arg2
> > [/code]
> >
> > I read up on some documentation but am not very clear about how to use
> > popen. I want to relegate the shell to a background process, but it
> > needs to accept the sudo passwd too!
> >
> > I have tried
> > [code]
> > p = subprocess.Popen(['/bin/bash', 'sudo '+mypath+'code.sh '+arg1+'
> > '+arg2],
> >                                     stdout=subprocess.PIPE,
> >                                     stderr=subprocess.STDOUT)
> > [/code]
> > I tried some code from stackoverflow.com/questions/694000/why-doesnt-
> > subprocess-popen-always-return
> >
> > nothing really happens when this executes, the PIPE option pshes it to
> > the background and I can't push in the sudo passwd. Can someone please
> > give me an idea of how to go about this.
> >
> > To recap, I want to run a shell script, which needs to be started with
> > sudo, and then push it into the background.
> >
> > Thanks,
> > -A
>
> Your best bet is to make sudo not ask for a password.  :)  If you
> don't have the rights, then you can use pexpect to do what you want to
> do.  http://pexpect.sourceforge.net/pexpect.html
>

Whoah there. Pexpect, yes. Making sudo not ask for a password? Only if you
tell sudo to only not ask for a password for _this_ file. Telling sudo to
not require a password at all is asking for trouble.

Also, modifying sudo to allow this script to run without a password would
require that to be done on every machine that the OP wants to run on.

OP: use pexpect.
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From noone at example.com  Thu May 28 04:36:25 2009
From: noone at example.com (Jon Bendtsen)
Date: Thu, 28 May 2009 10:36:25 +0200
Subject: nntplib.NNTPTemporaryError: 441 Article has no body -- just 
	headers
In-Reply-To: <mailman.821.1243494606.8015.python-list@python.org>
References: <gvjbgm$12up$1@munin.diku.dk>
	<mailman.821.1243494606.8015.python-list@python.org>
Message-ID: <4A1E4D09.60402@example.com>

Dennis Lee Bieber wrote:
> On Wed, 27 May 2009 14:25:58 +0200, Jon Bendtsen <noone at example.com>
> declaimed the following in gmane.comp.python.general:
> 
>> 'From: root at laerdal.dk\nSubject: testing\nNewsgroups: test\nBody:
>> \n\n\nfoobar\n\n\n.\n\n\n'
>>
> 	I believe NNTP, like SMTP, requires \r\n line termination.

I will try it, but why does it then work when it posts the file? The
file is a std. unix file, so it should also only have \n line
termination.


From ldo at geek-central.gen.new_zealand  Thu May 28 04:57:13 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 28 May 2009 20:57:13 +1200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
	<gvkoep$oii$3@lust.ihug.co.nz>
	<mailman.819.1243494051.8015.python-list@python.org>
Message-ID: <gvljl9$8hg$4@lust.ihug.co.nz>

In message <mailman.819.1243494051.8015.python-list at python.org>, Dennis Lee 
Bieber wrote:

> On Thu, 28 May 2009 13:12:57 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
> 
>> 
>> What if the string you're searching for includes a "%" or "_" character?
> 
>    >>> db.literal((... "%wildcard%" ...))
>    (... "'%wildcard%'" ...)

Doesn't look like it worked, does it?



From ldo at geek-central.gen.new_zealand  Thu May 28 04:58:07 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 28 May 2009 20:58:07 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <gvljmv$8hg$5@lust.ihug.co.nz>

In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano 
wrote:

> A good UI standard should mean that:
> 
> * all functionality should be discoverable without reading the manual;

Which means no scripting languages are allowed?



From timothywayne.cook at gmail.com  Thu May 28 05:23:13 2009
From: timothywayne.cook at gmail.com (Tim Cook)
Date: Thu, 28 May 2009 02:23:13 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <3e609f22-ee9f-42dc-9877-99566e232aba@f19g2000yqh.googlegroups.com>

On May 26, 9:07?am, Lacrima <Lacrima.Ma... at gmail.com> wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

I use nothing but Wing.  Their support is great as well.



From cjns1989 at gmail.com  Thu May 28 05:44:07 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Thu, 28 May 2009 05:44:07 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <0039e83c$0$9673$c3e8da3@news.astraweb.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <20090528094407.GF2896@turki.gavron.org>

On Thu, May 28, 2009 at 12:06:25AM EDT, Steven D'Aprano wrote:
> On Wed, 27 May 2009 22:34:45 -0400, Chris Jones wrote:

> > I'm unsure about a python editor for everyone but since acquiring
> > habits takes time, I'm in favor of sticking to one editor for
> > everything.
> 
> Or use an editor which follows user interface standards, rather than
> invents its own conventions for everything. That way you can trivially
> swap from one compliant application to another compliant application.
> 
> A good UI standard should mean that:
> 
> * common tasks should use the same interface in any application that
> supports that task;
> 
> * all functionality should be discoverable without reading the manual;
> 
> * the most common functions should be _trivially_ discoverable;
> 
> * don't penalise the user for mistakes: as few actions as possible
> should be irreversible, and those which are irreversible should
> _effectively_ warn the user that they are irreversible;
> 
> * simple interfaces are better than complicated interfaces (easy tasks
> should be easy to perform);
> 
> * but dumbing-down is not the same as simplifying (complicated tasks
> should be possible);
> 
> * if possible, all functionality should be capable of being performed
> by either the mouse or keyboard.

All valid points on the face of it, but doesn't the above rule out both
vim and emacs?

CJ


From __peter__ at web.de  Thu May 28 06:03:49 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 28 May 2009 12:03:49 +0200
Subject: Python, Tkinter and popen problem
References: <mailman.803.1243448972.8015.python-list@python.org>
	<gvk2br$6bg$03$1@news.t-online.com>
	<mailman.811.1243469678.8015.python-list@python.org>
Message-ID: <gvlnh2$n7t$02$1@news.t-online.com>

norseman wrote:

> Peter Otten wrote:
>> norseman wrote:
>> 
>>> This was sent 5/19/09 and as yet has received no comments.
>> 
>>> I'm resending just in case a new reader might have an answer.
>> 
>> If you had posted two tiny scripts demonstrating your problem instead of
>> the longwinded explanation I might have tinkered.

> That's one of the problems - with Tkinter you don't get tiny files. :)

Nonsense. The minimal Tkinter program is

from Tkinter import Tk
root = Tk()
root.mainloop()

The idea is that you remove everything but the parts relevant to your 
problem (or build a toy example from scratch). This makes it easier for a 
non-guru to verify a potential answer. That non-guru might even be yourself, 
by the way.

> NOTE: program runs perfectly on both Linux and Windows XP Pro when run 
> from the keyboard. But not from another python program that wants the 
> phone line connected. (stdin/stdout)  Gee... There is never a County 
> Lineman when needed is there Glen? :)

It's not clear why you need to start the GUI at all as you seem to have 
control over boths scripts.

Peter



From paul.nospam at rudin.co.uk  Thu May 28 06:08:08 2009
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Thu, 28 May 2009 11:08:08 +0100
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <87bppd5ylz.fsf@rudin.co.uk>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:


> * if possible, all functionality should be capable of being performed by 
> either the mouse or keyboard.

I'd imagine that the requirement that *all* functionality can be
performed with the mouse rules out many text editors. Almost the
defining feature of a text editor is the ability to type text... which
mostly happens with a keyboard.


From dudeja.rajat at gmail.com  Thu May 28 06:19:12 2009
From: dudeja.rajat at gmail.com (dudeja.rajat at gmail.com)
Date: Thu, 28 May 2009 11:19:12 +0100
Subject: Unpack less values from function's return values
Message-ID: <e0b6c39a0905280319xd0c2166kfc62fd03ae6ba124@mail.gmail.com>

Hi,

I'm using Python 2.5.2. I'm getting this error whenever I try to unpack less
values from a function.

ValueError: too many values to unpack


I want to know if there is a way I can unpack less values returning from a
function?

Thanks,
Rajat
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From clp2 at rebertia.com  Thu May 28 06:40:12 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 28 May 2009 03:40:12 -0700
Subject: Unpack less values from function's return values
In-Reply-To: <e0b6c39a0905280319xd0c2166kfc62fd03ae6ba124@mail.gmail.com>
References: <e0b6c39a0905280319xd0c2166kfc62fd03ae6ba124@mail.gmail.com>
Message-ID: <50697b2c0905280340l63176060je067cb0c78099fde@mail.gmail.com>

On Thu, May 28, 2009 at 3:19 AM,  <dudeja.rajat at gmail.com> wrote:
> Hi,
>
> I'm using Python 2.5.2. I'm getting this error whenever I try to unpack less
> values from a function.
>
> ValueError: too many values to unpack
>
>
> I want to know if there is a way I can unpack less values returning from a
> function?

Unpack them into throwaway variables:

def foo(): return 1,2,3,4

a, b, _, _ = foo()

In very new Python, you can also do:

a, b, *_ = foo()

Cheers,
Chris
-- 
http://blog.rebertia.com


From bellman at lysator.liu.se  Thu May 28 06:42:05 2009
From: bellman at lysator.liu.se (Thomas Bellman)
Date: Thu, 28 May 2009 10:42:05 +0000 (UTC)
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
Message-ID: <gvlppt$hk0$1@news.lysator.liu.se>

Roy Smith <roy at panix.com> wrote:

> In article <gvb8fn$7gm$1 at lust.ihug.co.nz>,
> Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:

>> The right thing to do is try to ensure that all your connections are
>> properly closed at shutdown. That may not be enough (if your server crashes
>> due to bugs), so the other thing you need to do is retry the socket open,
>> say, at 30-second intervals, until it succeeds.

> That may be a reasonable thing to do for production code, but when you're
> building and debugging a server, it's a real pain to not be able to restart
> it quickly whenever you want (or need) to.

Speaking as a sysadmin, running applications for production,
programs not using SO_REUSEADDR should be taken out and shot.

You *can't* ensure that TCP connections are "properly closed".
For example, a *client* crashing, or otherwise becoming
unreachable, will leave TCP connections unclosed, no matter
what you do.

Not using SO_REUSEADDR means forcing a service interruption of
half an hour (IIRC) if for some reason the service must be
restarted, or having to reboot the entire machine.  No thanks.
I have been in that situation.


-- 
Thomas Bellman,   Lysator Academic Computer Club,   Link??ping University
"Never let your sense of morals prevent you    !  Sweden ; +46-13 177780
 from doing what is right."  -- Salvor Hardin  !  bellman at lysator.liu.se


From andreas.roehler at online.de  Thu May 28 06:52:15 2009
From: andreas.roehler at online.de (Andreas Roehler)
Date: Thu, 28 May 2009 12:52:15 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <gvemos$old$2@ger.gmane.org>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvemos$old$2@ger.gmane.org>
Message-ID: <4A1E6CDF.3070300@online.de>

Esmail wrote:
> LittleGrasshopper wrote:
>>
>> So what do you guys use, and why? Hopefully we can keep this civil.
> 
> I use Emacs, just because I have been using this editor for
> all sorts of things in the last 20+ years.
> 
> I haven't been able to get the python mode to work for Windows

A bug-report would be fine... :)

In case you use python-mode.el, please refer to

https://launchpad.net/python-mode


Thanks


Andreas R?hler

--
https://code.launchpad.net/s-x-emacs-werkstatt/

> (do most of my work under Linux anyway), but other than that I'm
> pretty happy with it :-)
> 
> HTH,
> Esmail
> 



From apardon at forel.vub.ac.be  Thu May 28 06:52:47 2009
From: apardon at forel.vub.ac.be (Antoon Pardon)
Date: 28 May 2009 10:52:47 GMT
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<c9566044-6e50-42ca-aa02-9ff63206c601@g22g2000pra.googlegroups.com>
	<m2zlcz1ykl.fsf@googlemail.com>
Message-ID: <slrnh1sr7v.fef.apardon@rcpc42.vub.ac.be>

Op 2009-05-26, Arnaud Delobelle schreef <arnodel at googlemail.com>:
> Sumitava Mukherjee <smukh at cognobytes.com> writes:
>
>> On May 26, 11:39?pm, Sumitava Mukherjee <sm... at cognobytes.com> wrote:
>>> Hi all,
>>> I need to randomly sample from a list where all choices have weights
>>> attached to them. The probability of them being choosen is dependent
>>> on the weights.
>>> If say Sample list of choices are [A,B,C,D,E] and weights of the same
>>> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
>>> want the likeliness of them being chosen be in the order : D>A>C>E>B
>
> You mean A > D > C > E > B
>
>>> In short I mean if prob of a H is .9 and probability of T be 0.1 then
>>> if I draw 10 samples, 9 should be H and 1 should be T.
>>>
>>> I coudn't find a function in the module random that does so.
>>> Please can someone guide me how the above could be implemented [either
>>> through some function which exists and I don't know or pointers to
>>> some code snippets which does so]?
>>
>>>>>> [Oh, I forgot to mention. I am looking for sampling without replacement.]
>
> If you do sampling without replacement, you need to know the exact
> number of each of A, B, C, D, E in the sample, not just their relative
> frequency.

As far as I understand, you are given the exact number of each. It is one.
The numbers given are not relative frequencies of appearance but weights
to be attributed for picking them.

-- 
Antoon Pardon


From jeanmichel at sequans.com  Thu May 28 06:57:16 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 28 May 2009 12:57:16 +0200
Subject: Inheritance and Design Question
In-Reply-To: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
References: <696c135d-7d9d-4055-8a0d-d33ce478de5d@x31g2000prc.googlegroups.com>
Message-ID: <4A1E6E0C.3060803@sequans.com>

imageguy wrote:
> I have an object the I would like to use as a base class.  Some of the
> methods I would like to override completely, but others I would simply
> like to call the base class method and use the return value in the
> child method.  The purpose here is to eliminate the duplication of
> valuable code in the parent, when I really just need the child to
> operate of a results of the parent.
>
> Consider the following two classes;
>
> class Parent(object):
>     def process(self, value):
>         retval = "Parent.result('%s')" % value
>         return retval
>
> class Child(Parent):
>     def __init__(self):
>         Parent.__init__(self)
>
>     def process(self, value):
>         retval = "Child.result('%s')" % super(Child, self).process
> (value)
>         return retval
>
> So ....
>
> foo = Child()
> print foo.process('the value')
>   
>>> Child.result('Parent.result('the value')')
>>>       
Try this

class Parent(object):

    def process(self, value):
        retval = "%s.result('%s')" % (self.__class__.__name__, value)
        return retval

class Child(Parent):
    def __init__(self):
        Parent.__init__(self)


foo = Child()
print foo.process('the value')
>>> Child.result('the value'')

Of course you cannot see the inheritance in the result, but I'm assuming you wanted only the instance class to be displayed.

Jean-Michel



From andreas.roehler at online.de  Thu May 28 06:59:48 2009
From: andreas.roehler at online.de (Andreas Roehler)
Date: Thu, 28 May 2009 12:59:48 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <op.uukccbg3a8ncjz@gnudebst>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<gvg5d7$382$2@lust.ihug.co.nz>	<mailman.741.1243325683.8015.python-list@python.org>	<roy-92C5E8.09222926052009@news.panix.com>
	<op.uukccbg3a8ncjz@gnudebst>
Message-ID: <4A1E6EA4.9030405@online.de>

Rhodri James wrote:
> On Tue, 26 May 2009 14:22:29 +0100, Roy Smith <roy at panix.com> wrote:
> 
>> My pet peeve is syntax-aware editors which get things wrong.  For
>> example,
>> the version of emacs I'm using now doesn't parse this properly:
>>
>> '''A triple-quoted string.  Some editors won't get this right'''
>>
>> The solution is to change the outer quotes to double-quotes, but it
>> annoys me when I have to change my code to appease a tool.
> 
> It's the separate python-mode that gets this (and much else) wrong.
> The Python mode that Ubuntu packages with emacs 22.2.1 works just
> fine.
> 

As it should do

python-mode.el from

https://launchpad.net/python-mode


From andreas.roehler at online.de  Thu May 28 07:09:18 2009
From: andreas.roehler at online.de (Andreas Roehler)
Date: Thu, 28 May 2009 13:09:18 +0200
Subject: What text editor is everyone using for Python
In-Reply-To: <op.uul09plha8ncjz@gnudebst>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<gvg5d7$382$2@lust.ihug.co.nz>	<mailman.741.1243325683.8015.python-list@python.org>	<roy-92C5E8.09222926052009@news.panix.com>	<mailman.782.1243385070.8015.python-list@python.org>	<4a1d628f$0$6471$426a74cc@news.free.fr>
	<op.uul09plha8ncjz@gnudebst>
Message-ID: <4A1E70DE.4080407@online.de>

Rhodri James wrote:
> On Wed, 27 May 2009 16:56:12 +0100, Bruno Desthuilliers
> <bruno.42.desthuilliers at websiteburo.invalid> wrote:
> 
>> Rhodri James a ?crit :
>>> On Tue, 26 May 2009 14:22:29 +0100, Roy Smith <roy at panix.com> wrote:
>>>
>>>> My pet peeve is syntax-aware editors which get things wrong.  For
>>>> example,
>>>> the version of emacs I'm using now doesn't parse this properly:
>>>>
>>>> '''A triple-quoted string.  Some editors won't get this right'''
>>>>
>>>> The solution is to change the outer quotes to double-quotes, but it
>>>> annoys me when I have to change my code to appease a tool.
>>>  It's the separate python-mode that gets this (and much else) wrong.
>>> The Python mode that Ubuntu packages with emacs 22.2.1 works just
>>> fine.
>>
>> On this point, indeed. But it also lacks almost every nice feature of
>> the One True python-mode (or at least did last time I had to update
>> this ... ubuntu box at work).
> 
> That rather depends on your definition of "nice".  The only feature of
> python-mode.el that I miss in python.el is the ability to run pylint from
> the menu,

Thanks mentioning it, I'll cc this to python-mode at python.org


 and I'll get over that.  The feature that caused me to uninstall
> python-mode.el was its bloody-minded determination to regard '_' as a word
> character, something which caused me more typing that it ever saved.
> 

Its just one line to comment in python-mode.el, like this:

  ;; (modify-syntax-entry ?\_ "w"  py-mode-syntax-table)






From andymac at bullseye.apana.org.au  Thu May 28 07:19:13 2009
From: andymac at bullseye.apana.org.au (Andrew MacIntyre)
Date: Thu, 28 May 2009 21:19:13 +1000
Subject: Building Python with icc on 64-bit Linux
In-Reply-To: <1DFB4A5E-0A88-4473-BB37-A5E4A668BF8E@laposte.net>
References: <1DFB4A5E-0A88-4473-BB37-A5E4A668BF8E@laposte.net>
Message-ID: <4A1E7331.6090808@bullseye.andymac.org>

Konrad Hinsen wrote:

> /home/shr/khinsen/tmp/Python-2.6.2/Modules/_ctypes/libffi/src/x86/ffi64.c(43): 
> \
> error: identifier "__int128_t" is undefined
>     __int128_t sse[MAX_SSE_REGS];
>     ^
> compilation aborted for 
> /home/shr/khinsen/tmp/Python-2.6.2/Modules/_ctypes/libf\
> fi/src/x86/ffi64.c (code 2)

That seems like a libffi configure failure (not properly handling 128bit
integers on this compiler/platform).

> and failed test:
> 
> test test_cmath failed -- Traceback (most recent call last):
>   File "/home/shr/khinsen/tmp/Python-2.6.2/Lib/test/test_cmath.py", line 
> 366, i\
> n test_specific_values
>     self.fail(error_message)
> AssertionError: acos0000: acos(complex(0.0, 0.0))
> Expected: complex(1.5707963267948966, -0.0)
> Received: complex(1.5707963267948966, 0.0)
> Received value insufficiently close to expected value.

I've seen this on other compilers/platforms.  The floating point support 
in 2.6 is being more rigorously tested.  This compiler/platform/math lib
doesn't seem to be explicitly handling -0.0 as different from 0.0.
test_math has other similar failures.

> Adding optimization yields even more failed tests. My configuration 
> options are:
> 
>     configure --prefix=$HOME CC=icc CXX=icc OPT=-O0
> 
> Did anyone encounter these problems before? Any solutions?

For the FP issues I wonder whether there's a compiler option that affects
how -0.0 is handled, or possibly a different math library?

The libffi issue would require delving into the libffi source and 
adjusting its configure script to properly handle the problematic case.
Unless you need ctypes, this may be something you can skip over...

-- 
-------------------------------------------------------------------------
Andrew I MacIntyre                     "These thoughts are mine alone..."
E-mail: andymac at bullseye.apana.org.au  (pref) | Snail: PO Box 370
        andymac at pcug.org.au             (alt) |        Belconnen ACT 2616
Web:    http://www.andymac.org/               |        Australia


From motoom at xs4all.nl  Thu May 28 07:30:18 2009
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Thu, 28 May 2009 13:30:18 +0200
Subject: GUI Programming
In-Reply-To: <49E1E77F.4030308@dreams.sk>
References: <49E1E77F.4030308@dreams.sk>
Message-ID: <200905281330.18903.motoom@xs4all.nl>

On Sunday 12 April 2009 15:07:11 Gabriel wrote:

> I'm python newbie and i need to write gui for my school work in python.
> I need to write it really quick, because i haven't much time .)

Try Tkinter, which is included by default with most Python installations.

Writing simple programs is easy like:

   from Tkinter import *
   root=Tk()
   w=Label(root, text="Hello, world!")
   w.pack()
   root.mainloop()

See the tutorial at 
http://www.pythonware.com/library/tkinter/introduction/hello-tkinter.htm


Greetings, 

-- 
"The ability of the OSS process to collect and harness 
the collective IQ of thousands of individuals across 
the Internet is simply amazing." - Vinod Valloppillil 
http://www.catb.org/~esr/halloween/halloween4.html


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 07:38:33 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 11:38:33 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<mailman.823.1243503842.8015.python-list@python.org>
Message-ID: <003a5234$0$9673$c3e8da3@news.astraweb.com>

On Thu, 28 May 2009 05:44:07 -0400, Chris Jones wrote:

>> * if possible, all functionality should be capable of being performed
>> by either the mouse or keyboard.
> 
> All valid points on the face of it, but doesn't the above rule out both
> vim and emacs?


Your point is?


*ducks and runs*


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 07:44:55 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 11:44:55 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<87bppd5ylz.fsf@rudin.co.uk>
Message-ID: <003a53b2$0$9673$c3e8da3@news.astraweb.com>

On Thu, 28 May 2009 11:08:08 +0100, Paul Rudin wrote:

> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> 
> 
>> * if possible, all functionality should be capable of being performed
>> by either the mouse or keyboard.
> 
> I'd imagine that the requirement that *all* functionality can be
> performed with the mouse rules out many text editors. Almost the
> defining feature of a text editor is the ability to type text... which
> mostly happens with a keyboard.

Likewise graphics editors -- it's difficult if not impossible to edit an 
image pixel by pixel using the keyboard. Hence the "if possible". 

(Aside: It's really discouraging that, even on a technical newsgroup 
where most of the people are relatively intelligent, the provisos and 
qualifications I give seem to be ignored in favour of an unrealistically 
extreme interpretation.)

I do recall once in the mid 1980s, using a Macintosh with a broken 
keyboard. I was actually able to get useful work done by clicking letters 
on a virtual keyboard (the "Keyboard" desk accessory for those who 
remember it) and copying and pasting the text into the editor.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 07:50:52 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 11:50:52 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<gvljmv$8hg$5@lust.ihug.co.nz>
Message-ID: <003a5518$0$9673$c3e8da3@news.astraweb.com>

On Thu, 28 May 2009 20:58:07 +1200, Lawrence D'Oliveiro wrote:

> In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano
> wrote:
> 
>> A good UI standard should mean that:
>> 
>> * all functionality should be discoverable without reading the manual;
> 
> Which means no scripting languages are allowed?

"Should", not "must".

In any case, once you've scripted some particular piece of functionality, 
the application should allow you to discover the existence of that 
script. Does the application have a "Scripts" or "Plugins" menu (or 
equivalent)? Or do you have to rummage around in the file system, looking 
for secret scripts in undocumented locations?


-- 
Steven


From drobinow at gmail.com  Thu May 28 08:14:32 2009
From: drobinow at gmail.com (David Robinow)
Date: Thu, 28 May 2009 08:14:32 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1E70DE.4080407@online.de>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
	<4a1d628f$0$6471$426a74cc@news.free.fr> <op.uul09plha8ncjz@gnudebst>
	<4A1E70DE.4080407@online.de>
Message-ID: <4eb0089f0905280514v24b8ee83x5f61a209ba993c0f@mail.gmail.com>

On Thu, May 28, 2009 at 7:09 AM, Andreas Roehler
<andreas.roehler at online.de> wrote:
> Rhodri James wrote:
>>?and I'll get over that. ?The feature that caused me to uninstall
>> python-mode.el was its bloody-minded determination to regard '_' as a word
>> character, something which caused me more typing that it ever saved.
>
> Its just one line to comment in python-mode.el, like this:
>
> ?;; (modify-syntax-entry ?\_ "w" ?py-mode-syntax-table)
>
 Not really a good idea to make minor changes to distributed elisp.
You'll have to keep redoing the change every time a new version comes
out.
 Better to put something like this in your .emacs file.

  (eval-after-load "python-mode"
    '(modify-syntax-entry ?\_ " " py-mode-syntax-table))


From cjns1989 at gmail.com  Thu May 28 08:28:32 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Thu, 28 May 2009 08:28:32 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <003a5234$0$9673$c3e8da3@news.astraweb.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<mailman.823.1243503842.8015.python-list@python.org>
	<003a5234$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <20090528122832.GG2896@turki.gavron.org>

On Thu, May 28, 2009 at 07:38:33AM EDT, Steven D'Aprano wrote:

> Your point is?

notepad, otoh..

> *ducks and runs*

.. likewise.




From basti.wiesner at gmx.net  Thu May 28 08:31:38 2009
From: basti.wiesner at gmx.net (Sebastian Wiesner)
Date: Thu, 28 May 2009 14:31:38 +0200
Subject: newbie: popen question
References: <328e5cd4-bc4e-47bf-b8e2-91764351c525@g22g2000pra.googlegroups.com>
	<75004846-9f60-401f-9a7b-adbc28add28b@x31g2000prc.googlegroups.com>
Message-ID: <gvm079$asb$1@hoshi.visyn.net>

<Sean DiZazzo ? Donnerstag, 28. Mai 2009 10:11>

> Your best bet is to make sudo not ask for a password.  :)  If you
> don't have the rights, then you can use pexpect to do what you want to
> do.  http://pexpect.sourceforge.net/pexpect.html
> 
> See the second example on that page.
> 
> child = pexpect.spawn('scp foo myname at host.example.com:.')
> child.expect ('Password:')
> child.sendline (mypassword)

The sudo password prompt is very configurable, so changing the configuration 
to allow execution without password input is really the best option.

-- 
Freedom is always the freedom of dissenters.
                                      (Rosa Luxemburg)



From rhodri at wildebst.demon.co.uk  Thu May 28 08:34:12 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 28 May 2009 13:34:12 +0100
Subject: What text editor is everyone using for Python
In-Reply-To: <87fxep6bpz.fsf@rudin.co.uk>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
	<4a1d628f$0$6471$426a74cc@news.free.fr>
	<mailman.810.1243464033.8015.python-list@python.org>
	<87fxep6bpz.fsf@rudin.co.uk>
Message-ID: <op.uum3vakna8ncjz@gnudebst>

On Thu, 28 May 2009 06:24:56 +0100, Paul Rudin <paul.nospam at rudin.co.uk>  
wrote:

> "Rhodri James" <rhodri at wildebst.demon.co.uk> writes:
>
>> The feature that caused me to uninstall python-mode.el was its
>> bloody-minded determination to regard '_' as a word character,
>> something which caused me more typing that it ever saved.
>
> Probably you could have changed this in a few minutes. Or does fiddling
> with emacs lisp invalidate your python programmer's licence? ;-)

I probably could, but uninstalling didn't even require that much
brain-power, and as I said I only missed one feature (and that not
much).

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From jason at powerpull.net  Thu May 28 08:52:13 2009
From: jason at powerpull.net (Jason S. Friedman)
Date: Thu, 28 May 2009 12:52:13 +0000
Subject: What text editor is everyone using for Python
In-Reply-To: <mailman.3058.1243514102.8014.python-list@python.org>
References: <mailman.3058.1243514102.8014.python-list@python.org>
Message-ID: <4A1E88FD.8040409@powerpull.net>

I use Eclipse (www.eclipse.org) with the PyDev plugin 
(pydev.sourceforge.net).


From ebonak at hotmail.com  Thu May 28 08:52:33 2009
From: ebonak at hotmail.com (Esmail)
Date: Thu, 28 May 2009 08:52:33 -0400
Subject: What text editor is everyone using for Python
In-Reply-To: <4A1E6CDF.3070300@online.de>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<gvemos$old$2@ger.gmane.org>
	<4A1E6CDF.3070300@online.de>
Message-ID: <4A1E8911.80108@hotmail.com>

Andreas Roehler wrote:
> Esmail wrote:
>> LittleGrasshopper wrote:
>>> So what do you guys use, and why? Hopefully we can keep this civil.
>> I use Emacs, just because I have been using this editor for
>> all sorts of things in the last 20+ years.
>>
>> I haven't been able to get the python mode to work for Windows
> 
> A bug-report would be fine... :)
> 
> In case you use python-mode.el, please refer to
> 
> https://launchpad.net/python-mode
> 

Hi,

This got me to waste a bunch of time first with (add-to-list) unsuccessfully
before I checked to see if there was an update to emacs distribution/bundle
I use under Windows, which is

http://vgoulet.act.ulaval.ca/en/ressources/emacs/windows

Using its default .emacs I was able to get the python mode to work fine.
(I suspect there was something off in my ancient .emacs file which I had
been porting from system to system in the last 10 years  or so).

Glad this thread motivated me to upgrade/check on this.

Regards,
Esmail



From google at mrabarnett.plus.com  Thu May 28 09:46:34 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 28 May 2009 14:46:34 +0100
Subject: Unpack less values from function's return values
In-Reply-To: <50697b2c0905280340l63176060je067cb0c78099fde@mail.gmail.com>
References: <e0b6c39a0905280319xd0c2166kfc62fd03ae6ba124@mail.gmail.com>
	<50697b2c0905280340l63176060je067cb0c78099fde@mail.gmail.com>
Message-ID: <4A1E95BA.6020506@mrabarnett.plus.com>

Chris Rebert wrote:
> On Thu, May 28, 2009 at 3:19 AM,  <dudeja.rajat at gmail.com> wrote:
>> Hi,
>>
>> I'm using Python 2.5.2. I'm getting this error whenever I try to unpack less
>> values from a function.
>>
>> ValueError: too many values to unpack
>>
>>
>> I want to know if there is a way I can unpack less values returning from a
>> function?
> 
> Unpack them into throwaway variables:
> 
> def foo(): return 1,2,3,4
> 
> a, b, _, _ = foo()
> 
> In very new Python, you can also do:
> 
> a, b, *_ = foo()
> 
Or:

a, b = foo()[ : 2]


From 2489271 at gmail.com  Thu May 28 09:46:41 2009
From: 2489271 at gmail.com (paffnucy)
Date: Thu, 28 May 2009 06:46:41 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <35ea50fb-b74f-4d1a-8bad-8c9be92f5aac@p4g2000vba.googlegroups.com>

Or you can try pyscripter
http://code.google.com/p/pyscripter/
Very fast, lightwieght and powerfull python editor.


From bobby.house at gmail.com  Thu May 28 10:47:32 2009
From: bobby.house at gmail.com (Bobby)
Date: Thu, 28 May 2009 07:47:32 -0700 (PDT)
Subject: Unpack less values from function's return values
References: <e0b6c39a0905280319xd0c2166kfc62fd03ae6ba124@mail.gmail.com> 
	<mailman.836.1243509329.8015.python-list@python.org>
Message-ID: <614a8462-eeed-435c-be78-d5286f07b34d@q16g2000yqg.googlegroups.com>

On May 28, 5:40?am, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, May 28, 2009 at 3:19 AM, ?<dudeja.ra... at gmail.com> wrote:
> > Hi,
>
> > I'm using Python 2.5.2. I'm getting this error whenever I try to unpack less
> > values from a function.
>
> > ValueError: too many values to unpack
>
> > I want to know if there is a way I can unpack less values returning from a
> > function?
>
> Unpack them into throwaway variables:
>
> def foo(): return 1,2,3,4
>
> a, b, _, _ = foo()
>
> In very new Python, you can also do:
>
> a, b, *_ = foo()
>
> Cheers,
> Chris
> --http://blog.rebertia.com

You could also do something like
a,b = foo()[:2]


From aahz at pythoncraft.com  Thu May 28 10:55:33 2009
From: aahz at pythoncraft.com (Aahz)
Date: 28 May 2009 07:55:33 -0700
Subject: 4 hundred quadrillonth?
References: <56b47d17-f439-4ef0-9955-141029b780b1@j12g2000vbl.googlegroups.com>
	<gv4st8$11t$1@ger.gmane.org>
	<mailman.795.1243436849.8015.python-list@python.org>
	<4a1da210$0$90265$14726298@news.sunsite.dk>
Message-ID: <gvm8l5$hk9$1@panix5.panix.com>

In article <4a1da210$0$90265$14726298 at news.sunsite.dk>,
Mark Dickinson <dickinsm at gmail.com> wrote:
>
>This is getting rather long.  Perhaps I should put the above comments
>together into a 'post-PEP' document.

Yes, you should.  Better explanation of floating point benefits everyone
when widely available.  I even learned a little bit here and I've been
following this stuff for a while (though by no means any kind of
numerical expert).
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"In many ways, it's a dull language, borrowing solid old concepts from
many other languages & styles:  boring syntax, unsurprising semantics,
few automatic coercions, etc etc.  But that's one of the things I like
about it."  --Tim Peters on Python, 16 Sep 1993


From FongAndrew at gmail.com  Thu May 28 11:50:00 2009
From: FongAndrew at gmail.com (Andrew Fong)
Date: Thu, 28 May 2009 08:50:00 -0700 (PDT)
Subject: Most pythonic way to truncate unicode?
Message-ID: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>

I need to ...

1) Truncate long unicode (UTF-8) strings based on their length in
BYTES. For example, u'\u4000\u4001\u4002 abc' has a length of 7 but
takes up 13 bytes. Since u'\u4000' takes up 3 bytes, I want truncate
(u'\u4000\u4001\u4002 abc',3) == u'\u4000' -- as compared to
u'\u4000\u4001\u4002 abc'[:3] == u'\u4000\u4001\u4002'.

2) I don't want to accidentally chop any unicode characters in half.
If the byte truncate length would normally cut a unicode character in
2, then I just want to drop the whole character, not leave an orphaned
byte. So truncate(u'\u4000\u4001\u4002 abc',4) == u'\u4000' ... as
opposed to getting UnicodeDecodeError.

I'm using Python2.6, so I have access to things like bytearray. Are
there any built-in ways to do something like this already? Or do I
just have to iterate over the unicode string?

-- Andrew


From urbangabo at gmail.com  Thu May 28 11:58:28 2009
From: urbangabo at gmail.com (Gabor Urban)
Date: Thu, 28 May 2009 17:58:28 +0200
Subject: What text editor is everyone using for Python
Message-ID: <f7ac28aa0905280858w736ebef5h827b94e86bd07d85@mail.gmail.com>

I use Emacs, as for the other editing activities. I like it for it is
very powerfull.

-- 
Linux: Choice of a GNU Generation


From __peter__ at web.de  Thu May 28 11:58:35 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 28 May 2009 17:58:35 +0200
Subject: Most pythonic way to truncate unicode?
References: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>
Message-ID: <gvmca7$l3n$00$1@news.t-online.com>

Andrew Fong wrote:

> I need to ...
> 
> 1) Truncate long unicode (UTF-8) strings based on their length in
> BYTES. For example, u'\u4000\u4001\u4002 abc' has a length of 7 but
> takes up 13 bytes. Since u'\u4000' takes up 3 bytes, I want truncate
> (u'\u4000\u4001\u4002 abc',3) == u'\u4000' -- as compared to
> u'\u4000\u4001\u4002 abc'[:3] == u'\u4000\u4001\u4002'.
> 
> 2) I don't want to accidentally chop any unicode characters in half.
> If the byte truncate length would normally cut a unicode character in
> 2, then I just want to drop the whole character, not leave an orphaned
> byte. So truncate(u'\u4000\u4001\u4002 abc',4) == u'\u4000' ... as
> opposed to getting UnicodeDecodeError.
> 
> I'm using Python2.6, so I have access to things like bytearray. Are
> there any built-in ways to do something like this already? Or do I
> just have to iterate over the unicode string?

How about

>>> u"???".encode("utf8")[:5].decode("utf8", "ignore")
u'\xe4\xf6'
>>> print _
??

Peter



From durumdara at gmail.com  Thu May 28 12:29:31 2009
From: durumdara at gmail.com (Durumdara)
Date: Thu, 28 May 2009 18:29:31 +0200
Subject: Deletion/record visibility error in PG with Python...
Message-ID: <9e384ef60905280929t1a8bff86le33ff5f46a0abb05@mail.gmail.com>

Hi!

PGSQL makes me crazy...

I port my apps to PGSQL, and I near to finish - but I got this problem...

Params: PGSQL 8.3, Windows, Pylons, PGDB, DBUTILS...

I opened the connection with DBUTILS. I have one thread (the test thread),
possible it have more in the background, I don't know...

See this pseudocode:

start trs ("rollback; begin;")
delete old recs
insert new recs
commit

I delete all of old records with:
"delete from levelfo where level = :level"

This I do in one transaction that protect the next sequences to.

Later I want to insert the records, BUT:

        def GetCodes(reks):
            l = []
            for rek in reks:
                l.append(str(rek['KOD']))
            return str(l)
        def LogInsertedReks(Index):
            csql = "select * from levelfo where level=%d" %
self.LevelRek['KOD']
            self.Cur.execute(csql)
            reks = dwdb.FetchAll(self.Cur)
            self.log.info(Index + ' #### INSERTED REKS ####')
            self.log.info('%s' % GetCodes(reks))

        for levelforek in self.LevelFoReks:
            LogInsertedReks('Start1')
            LogInsertedReks('Start2')
            LogInsertedReks('Start3')
            LogInsertedReks('Start4')
            LogInsertedReks('Start5')
            LogInsertedReks('Start6')
            kod = levelforek['KOD']
            self.log.info('#### INSERT ####')
            self.log.info('%s' % levelforek['KOD'])
            LogInsertedReks('Start7')
            LogInsertedReks('Start8')
            LogInsertedReks('Start9')

See this log:
18:07:02,276 INFO  [xxx] Start1 #### INSERTED REKS ####
18:07:02,276 INFO  [xxx] []
18:07:02,292 INFO  [xxx] Start2 #### INSERTED REKS ####
18:07:02,292 INFO  [xxx] []
18:07:02,292 INFO  [xxx] Start3 #### INSERTED REKS ####
18:07:02,292 INFO  [xxx] []
18:07:02,306 INFO  [xxx] Start4 #### INSERTED REKS ####
18:07:02,306 INFO  [xxx] []
18:07:02,306 INFO  [xxx] Start5 #### INSERTED REKS ####
18:07:02,306 INFO  [xxx] []
18:07:02,306 INFO  [xxx] Start6 #### INSERTED REKS ####
18:07:02,306 INFO  [xxx] []
18:07:02,306 INFO  [xxx] #### INSERT ####
18:07:02,306 INFO  [xxx] 11551
18:07:02,306 INFO  [xxx] Start7 #### INSERTED REKS ####
18:07:02,306 INFO  [xxx] []
18:07:02,619 INFO  [xxx] Start8 #### INSERTED REKS ####
18:07:02,619 INFO  [xxx] ['11555', '11556', '11557', '11558']
18:07:02,634 INFO  [xxx] Start9 #### INSERTED REKS ####
18:07:02,634 INFO  [xxx] ['11555', '11556', '11557', '11558']
18:07:02,697 INFO  [xxx] After UID #### INSERTED REKS ####
18:07:02,697 INFO  [xxx] ['11555', '11556', '11557', '11558']

As you see, I don't do anything (like db operations), and deleted records
are appearing...
Hmmmm... possible is it a cursor changing?

When I change my logger to see the object ids, I can see the cursor changing
(in the background):

18:21:29,134 INFO  [xxx] Start7 #### INSERTED REKS ####
18:21:29,134 INFO  [xxx] []
18:21:29,134 INFO  [xxx] Start7 #### CURSOR INFO ####
18:21:29,134 INFO  [xxx] [<DBUtils.SteadyDB.SteadyDBCursor instance at
0x01955710>]
18:21:29,134 INFO  [xxx] [<DBUtils.SteadyDB.SteadyDBConnection instance at
0x019555A8>]
********** 18:21:29,134 INFO  [xxx] [<pgdb.pgdbCursor instance at
0x019556E8>]
18:21:29,431 INFO  [xxx] Start8 #### INSERTED REKS ####
18:21:29,431 INFO  [xxx] ['11555', '11556', '11557', '11558']
18:21:29,431 INFO  [xxx] Start8 #### CURSOR INFO ####
18:21:29,431 INFO  [xxx] [<DBUtils.SteadyDB.SteadyDBCursor instance at
0x01955710>]
18:21:29,431 INFO  [xxx] [<DBUtils.SteadyDB.SteadyDBConnection instance at
0x019555A8>]
********** 18:21:29,431 INFO  [xxx] [<pgdb.pgdbCursor instance at
0x0195AE18>]

What happened? How I can avoid the cursor changing? How to fix it in my
transaction?
I never ask for new cursor, I used same variable in all of my context
(self.Cur)... :-(

So what is the solution? Drop DBUtils? Or what?

Thanks for your help:
    dd
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From thebiggestbangtheory at gmail.com  Thu May 28 12:56:36 2009
From: thebiggestbangtheory at gmail.com (thebiggestbangtheory at gmail.com)
Date: Thu, 28 May 2009 09:56:36 -0700 (PDT)
Subject: newbie: popen question
References: <328e5cd4-bc4e-47bf-b8e2-91764351c525@g22g2000pra.googlegroups.com>
	<75004846-9f60-401f-9a7b-adbc28add28b@x31g2000prc.googlegroups.com> 
	<gvm079$asb$1@hoshi.visyn.net>
Message-ID: <662556cb-f2b4-4a6c-a612-176478612c12@q14g2000vbn.googlegroups.com>

On May 28, 5:31?am, Sebastian Wiesner <basti.wies... at gmx.net> wrote:
> <Sean DiZazzo ? Donnerstag, 28. Mai 2009 10:11>
>
> > Your best bet is to make sudo not ask for a password. ?:) ?If you
> > don't have the rights, then you can use pexpect to do what you want to
> > do. ?http://pexpect.sourceforge.net/pexpect.html
>
> > See the second example on that page.
>
> > child = pexpect.spawn('scp foo myn... at host.example.com:.')
> > child.expect ('Password:')
> > child.sendline (mypassword)
>
> The sudo password prompt is very configurable, so changing the configuration
> to allow execution without password input is really the best option.
>
> --
> Freedom is always the freedom of dissenters.
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (Rosa Luxemburg)

Thanks guys for helping out! very good answers :-)

Before I saw your answers, I tried the following,

output = subprocess.Popen(["sudo","-b", "code.sh", "arg1"],
stdout=subprocess.PIPE).communicate()[0]

This seemed to push the shell execution process to the background and
because my python program was invoked initially with sudo, it seems I
did not need to enter a passwd again.

Any comments about this..any issues that you see will crop up?

Thanks a ton again.





From castironpi at gmail.com  Thu May 28 13:53:17 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Thu, 28 May 2009 10:53:17 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de> 
	<02204669$0$25303$c3e8da3@news.astraweb.com>
	<kkb00q.g62@spenarnc.xs4all.nl> 
	<0039e85f$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <8cc46645-100a-46e4-9b7c-9dff7f1e2c18@z19g2000vbz.googlegroups.com>

On May 27, 11:07?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Wed, 27 May 2009 12:58:02 +0000, Albert van der Horst wrote:
>
> >>And how is reduce() supposed to know whether or not some arbitrary
> >>function is commutative?
>
> > Why would it or need it? A Python that understands the ``par'' keyword
> > is supposed to know it can play some tricks with optimizing reduce() if
> > the specific function is commutative.
>
> Fine. Move the smarts out of reduce() into the compiler. How is the
> compiler supposed to know if an arbitrary function is commutative?

Unit testing.


From trhaynes at gmail.com  Thu May 28 14:06:03 2009
From: trhaynes at gmail.com (trhaynes)
Date: Thu, 28 May 2009 11:06:03 -0700 (PDT)
Subject: py2app and OpenGL, "No module named util" in ctypes
Message-ID: <b09874da-5dcb-4b60-aae8-f430f1db5ba1@o20g2000vbh.googlegroups.com>

I'm trying to use py2app to package an OpenGL app, so first I tried to
build the example here

http://svn.pythonmac.org/py2app/py2app/trunk/examples/PyOpenGL/

and I get the error:

>  File "/opt/local/lib/python2.5/site-packages/PyOpenGL-3.0.0c1-py2.5.egg/OpenGL/platform/darwin.py", line 24, in <module>
>    import ctypes, ctypes.util
>ImportError: No module named util
>2009-05-28 13:55:06.819 lesson5[19965:10b] lesson5 Error
>2009-05-28 13:55:06.821 lesson5[19965:10b] lesson5 Error
>An unexpected error has occurred during execution of the main script
>
>ImportError: No module named util

But when I open up my python interactive interpreter and "import
ctypes.util", it works fine (using lesson5.app/Contents/MacOS/python,
too).

Thanks for the help.

-tom


From suruti94 at gmail.com  Thu May 28 14:09:02 2009
From: suruti94 at gmail.com (Mohan Parthasarathy)
Date: Thu, 28 May 2009 11:09:02 -0700
Subject: Seeking old post on developers who like IDEs vs developers who 
	like simple languages
In-Reply-To: <mff7e6-e43.ln1@satorlaser.homedns.org>
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
Message-ID: <89dd3da60905281109x100fb22bge52df90acf5c79c6@mail.gmail.com>

On Mon, May 18, 2009 at 12:31 AM, Ulrich Eckhardt
<eckhardt at satorlaser.com>wrote:

> Steve Ferg wrote:
> > On the one hand, there are developers who love big IDEs with lots of
> > features (code generation, error checking, etc.), and rely on them to
> > provide the high level of support needed to be reasonably productive
> > in heavy-weight languages (e.g. Java).
> >
> > On the other hand there are developers who much prefer to keep things
> > light-weight and simple.  They like clean high-level languages (e.g.
> > Python) which are compact enough that you can keep the whole language
> > in your head, and require only a good text editor to be used
> > effectively.
>
> This distinction is IMHO not correct. If you took a look at Java, you would
> notice that the core language syntax is much simpler than Python's. OTOH,
> if you add the standard libraries, you would soon see that Python's
> libraries are not as consistent (i.e. conformant to PEP8) as Java's.
>
> What makes up for Python's perceived usability problems though is the
> commandline parser that allows you to inspect the type of an object and its
> parts of it at runtime, in particular the docstrings are a treasure there.
>
> That said, an IDE that provides auto-completion (e.g. that gives you a list
> of available class members) is a good thing in Java, because you don't have
> to browse the documentation as often. With Python, that is impossible
> because there are no types bound to parameters, so any type that fits is
> allowed (duck typing).
>

I just downloaded the Aptana IDE which has Python support and I have not
tried it yet. But I remebered seeing this thread. Has anyone used the Aptana
IDE for Python development ?

thanks
mohan


>
> Uli
>
> --
> Sator Laser GmbH
> Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From davea at ieee.org  Thu May 28 14:15:57 2009
From: davea at ieee.org (Dave Angel)
Date: Thu, 28 May 2009 14:15:57 -0400
Subject: [pyunit] Only run one specific test
In-Reply-To: <87k542dtzq.fsf@vostro.rath.org>
References: <87k542dtzq.fsf@vostro.rath.org>
Message-ID: <4A1ED4DD.9020909@ieee.org>

Nikolaus Rath wrote:
> Hi,
>
> Consider these two files:
>
> ,---- mytest.py -----
> | #!/usr/bin/env python
> | import unittest
> | 
> | class myTestCase(unittest.TestCase):
> |     def test_foo(self):
> | 	pass
> | 
> | # Somehow important according to pyunit documentation
> | def suite():
> |     return unittest.makeSuite(myTestCase)
> `----
>
> ,---- runtest ---
> | #!/usr/bin/env python
> | import unittest
> | 
> | # Find and import tests
> | modules_to_test =  [ "mytest" ]
> | map(__import__, modules_to_test)
> | 
> | # Runs all tests in test/ directory
> | def suite():
> |     alltests = unittest.TestSuite()
> |     for name in modules_to_test:
> |         alltests.addTest(unittest.findTestCases(sys.modules[name]))
> |     return alltests
> | 
> | if __name__ == '__main__':
> |     unittest.main(defaultTest='suite')
> `----
>
>
> if I run runtest without arguments, it works. But according to runtest
> --help, I should also be able to do
>
> ,----
> | $ ./runtest mytest
> | Traceback (most recent call last):
> |   File "./runtest", line 20, in <module>
> |     unittest.main()
> |   File "/usr/lib/python2.6/unittest.py", line 816, in __init__
> |     self.parseArgs(argv)
> |   File "/usr/lib/python2.6/unittest.py", line 843, in parseArgs
> |     self.createTests()
> |   File "/usr/lib/python2.6/unittest.py", line 849, in createTests
> |     self.module)
> |   File "/usr/lib/python2.6/unittest.py", line 613, in loadTestsFromNames
> |     suites = [self.loadTestsFromName(name, module) for name in names]
> |   File "/usr/lib/python2.6/unittest.py", line 584, in loadTestsFromName
> |     parent, obj = obj, getattr(obj, part)
> | AttributeError: 'module' object has no attribute 'mytest'
> `----
>
>
> Why doesn't this work?
>
> Best,
>
>    -Nikolaus
>
>
>   
First, you're missing a    import sys in the runtest.py module.  Without 
that, it won't even start.

Now, I have no familiarity with unittest, but I took this as a 
challenge.  The way I read the code is that you need an explicit import 
of mytest if you're
going to specify a commandline of
    runtest mytest

So I'd add two lines to the beginning of  runtest.py:

import sys
import mytest





From descentspb at gmail.com  Thu May 28 14:17:20 2009
From: descentspb at gmail.com (Igor Katson)
Date: Thu, 28 May 2009 22:17:20 +0400
Subject: What is the purpose of "struct" and "array" modules
Message-ID: <4A1ED530.3080109@gmail.com>

I pretty much understand what they do, but what's the case of using 
these modules by example? Is it something like pickle, to store the data 
efficiently in files?


From bsk16 at case.edu  Thu May 28 14:19:50 2009
From: bsk16 at case.edu (Benjamin Kaplan)
Date: Thu, 28 May 2009 14:19:50 -0400
Subject: Seeking old post on developers who like IDEs vs developers who 
	like simple languages
In-Reply-To: <89dd3da60905281109x100fb22bge52df90acf5c79c6@mail.gmail.com>
References: <07e5af6c-d41d-4a4a-8e2e-f27bc92c96e5@f16g2000vbf.googlegroups.com>
	<mff7e6-e43.ln1@satorlaser.homedns.org>
	<89dd3da60905281109x100fb22bge52df90acf5c79c6@mail.gmail.com>
Message-ID: <ec96e1390905281119i33a00c17p6e5b7c5eb7c01d53@mail.gmail.com>

On Thu, May 28, 2009 at 2:09 PM, Mohan Parthasarathy <suruti94 at gmail.com>wrote:

>
>
> On Mon, May 18, 2009 at 12:31 AM, Ulrich Eckhardt <eckhardt at satorlaser.com
> > wrote:
>
>> Steve Ferg wrote:
>> > On the one hand, there are developers who love big IDEs with lots of
>> > features (code generation, error checking, etc.), and rely on them to
>> > provide the high level of support needed to be reasonably productive
>> > in heavy-weight languages (e.g. Java).
>> >
>> > On the other hand there are developers who much prefer to keep things
>> > light-weight and simple.  They like clean high-level languages (e.g.
>> > Python) which are compact enough that you can keep the whole language
>> > in your head, and require only a good text editor to be used
>> > effectively.
>>
>> This distinction is IMHO not correct. If you took a look at Java, you
>> would
>> notice that the core language syntax is much simpler than Python's. OTOH,
>> if you add the standard libraries, you would soon see that Python's
>> libraries are not as consistent (i.e. conformant to PEP8) as Java's.
>>
>> What makes up for Python's perceived usability problems though is the
>> commandline parser that allows you to inspect the type of an object and
>> its
>> parts of it at runtime, in particular the docstrings are a treasure there.
>>
>> That said, an IDE that provides auto-completion (e.g. that gives you a
>> list
>> of available class members) is a good thing in Java, because you don't
>> have
>> to browse the documentation as often. With Python, that is impossible
>> because there are no types bound to parameters, so any type that fits is
>> allowed (duck typing).
>>
>
> I just downloaded the Aptana IDE which has Python support and I have not
> tried it yet. But I remebered seeing this thread. Has anyone used the Aptana
> IDE for Python development ?
>

The "Aptana IDE" is just Eclipse (www.eclipse.org) with Aptana's plugins
installed (you can get the plugins using a normal eclipse build too). The
Python plugin they use is called PyDev (pydev.sourceforge.net). Look through
the archives for all the people using eclipse + pydev. There are lots of
them.


>
> thanks
> mohan
>
>
>>
>> Uli
>>
>> --
>> Sator Laser GmbH
>> Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From daniel.watrous at gmail.com  Thu May 28 14:23:35 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Thu, 28 May 2009 11:23:35 -0700 (PDT)
Subject: how to change response code in CGIHTTPServer.py
Message-ID: <2c86f050-8a1b-4124-9cc8-f6666d1bd7dc@s28g2000vbp.googlegroups.com>

Hello,

Python 2.5.2
WinXP

I'm using CGIHTTPServer.py and want to return a response code of 400
with a message in the event that the cgi script fails for some
reason.  I notice that
run_cgi(self):
executes this line of code,
self.send_response(200, "Script output follows")
which overwrites any headers that I print in my cgi.  Is there some
way to modify the response code without having to override
CGIHTTPServer.py?

Thanks,


From joshua at joshuakugler.com  Thu May 28 14:38:29 2009
From: joshua at joshuakugler.com (Joshua Kugler)
Date: Thu, 28 May 2009 10:38:29 -0800
Subject: How does Python's OOP feel?
References: <e137e8260905261946q5666c240m516b28d841c9970@mail.gmail.com>
Message-ID: <gvmln5$d47$1@ger.gmane.org>

> The good thing about python is : it 'tastes' like what it was being
> advertised

+1 QOTW




From roastie57 at gmail.com  Thu May 28 14:43:00 2009
From: roastie57 at gmail.com (Roastie)
Date: Thu, 28 May 2009 11:43:00 -0700 (PDT)
Subject: AOPython Question
Message-ID: <b5ae3174-ef46-452a-96df-c5018bbac31e@21g2000vbk.googlegroups.com>

I installed the AOPython module:

   % easy_install aopython

That left an aopython-1.0.3-py2.6.egg at
C:\mystuff\python\python_2.6.2\Lib\site-packages.

I entered the interpreter:

>>> import aopython
>>>

All is well.

But I was uncomfortable, since I was used to seeing directories
of Python code for modules in site-packages, so I decided
to read about eggs:
http://mrtopf.de/blog/python_zope/a-small-introduction-to-python-eggs/

The article told me to run:
    % easy_install aopython-1.0.3-py2.6.egg
The result was a long list of error messages and removal
of my egg, and Python could no longer use the AOPython module.

So, I'm looking for a better reference for telling me about eggs and
modules in site-packages.

Roastie
roastie57 at gmail.com


From wong_powah at yahoo.ca  Thu May 28 14:55:35 2009
From: wong_powah at yahoo.ca (powah)
Date: Thu, 28 May 2009 11:55:35 -0700 (PDT)
Subject: download all mib files from a web page
References: <c1e2a647-7913-4050-86da-0433b6796d4b@v4g2000vba.googlegroups.com>
	<ad31d28e-1472-4da6-b704-820435947191@y7g2000yqa.googlegroups.com> 
	<Lo2dnbn72r-YCIDXnZ2dnUVZ_rmdnZ2d@pdx.net>
Message-ID: <339e1ee3-3fcf-4db7-9725-ee1bc9c94e68@o30g2000vbc.googlegroups.com>

On May 27, 3:37?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> powah wrote:
> > ...
> > I fixed one error, now if the filename is misspelled, how to ignore
> > the error and continue?
>
> You really should go through the tutorial. ?It will explain this and
> other important things well. ?But, since I'm feeling generous:
>
> Replace this:> ? ? u=urllib2.urlopen(link)
> > ? ? p=u.read()
> > ? ? open(filename,"w").write(p)
>
> with this:
> ? ? ? ?try:
> ? ? ? ? ? ?u = urllib2.urlopen(link)
> ? ? ? ? ? ?p = u.read()
> ? ? ? ?except urllib2.HTTPError:
> ? ? ? ? ? ?pass
> ? ? ? ?else:
> ? ? ? ? ? ?dest = open(filename, "w")
> ? ? ? ? ? ?dest.write(p)
> ? ? ? ? ? ?dest.close()
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

Thanks!


From norseman at hughes.net  Thu May 28 15:03:23 2009
From: norseman at hughes.net (norseman)
Date: Thu, 28 May 2009 12:03:23 -0700
Subject: Python, Tkinter and popen problem
In-Reply-To: <gvlnh2$n7t$02$1@news.t-online.com>
References: <mailman.803.1243448972.8015.python-list@python.org>	<gvk2br$6bg$03$1@news.t-online.com>	<mailman.811.1243469678.8015.python-list@python.org>
	<gvlnh2$n7t$02$1@news.t-online.com>
Message-ID: <4A1EDFFB.1060400@hughes.net>

Peter Otten wrote:
> norseman wrote:
> 
>> Peter Otten wrote:
>>> norseman wrote:
>>>
>>>> This was sent 5/19/09 and as yet has received no comments.
>>>> I'm resending just in case a new reader might have an answer.
>>> If you had posted two tiny scripts demonstrating your problem instead of
>>> the longwinded explanation I might have tinkered.
> 
>> That's one of the problems - with Tkinter you don't get tiny files. :)
> 
> Nonsense. The minimal Tkinter program is
> 
> from Tkinter import Tk
> root = Tk()
> root.mainloop()
> 
> The idea is that you remove everything but the parts relevant to your 
> problem (or build a toy example from scratch). This makes it easier for a 
> non-guru to verify a potential answer. That non-guru might even be yourself, 
> by the way.
> 
>> NOTE: program runs perfectly on both Linux and Windows XP Pro when run 
>> from the keyboard. But not from another python program that wants the 
>> phone line connected. (stdin/stdout)  Gee... There is never a County 
>> Lineman when needed is there Glen? :)
> 
> It's not clear why you need to start the GUI at all as you seem to have 
> control over boths scripts.
> 
> Peter
> 
=========================================================================
To cover two responses at once:

Response from MRAB  google at mrabarnett.plus.com

> [snip]
>
> You're more likely to get help if you provide the minimum code that
> demonstrates the problem.
>
> Anyway, your original post said that you're running the child with
> os.popen. The documentation says:
>
> """Open a pipe to or from command. The return value is an open file
> object connected to the pipe, which can be read or written depending on
> whether mode is 'r' (default) or 'w'."""
>

Yes - that is what the docs say.
They also say flush() is supposed to work. The flush() designed for the
file type being used. (I think I counted six different flush() in the
lib.pdf for python 2.5.2...)

> In other words, it's one-way.
>
> Are you really using os.popen and not, say, os.popen2?
>
> (Providing actual code would make this clear.


I have tried both and Popen2.popen2().
os.popen runs both way, contrary to docs.

# master.py
import os
#                both lines work same
#xx= os.popen("/mnt/mass/py/z6.py").readlines()
xx= os.popen("/mnt/mass/py/z6.py",'r',1).readlines()
#                I had hoped small buffer would force a sync (flush())
#                No such luck.
for i in xx:
   print "\t"+i[:-1]

#"""
#                              end of file

The "\t" is to prove where the screen output came from.

========================================================
========================================================

 From Peter __peter__ at web.de

> Nonsense. The minimal Tkinter program is
>
> from Tkinter import Tk
> root = Tk()
> root.mainloop()
>

Just to be clear, that's as much a minimal program as

/* shp2dxfu.c
    purpose: To convert shp files to dxf files. (GNU C Unix version)
*/
#ifdef MSDOS
#include <stdio.h>
#include <math.h>
#include <fcntl.h>
#include <stat.h>
#include <io.h>
#include <alloc.h>
#include <stdlib.h>
#include <string.h>
#include <mem.h>
#endif

#ifdef UNIX
#include <stdio.h>
#include <math.h>
#include <fcntl.h>
#include "stat.h"
#include <malloc.h>
#include <stdlib.h>
#include <string.h>
#define O_BINARY 0x00
#define S_IREAD 0400
#endif

int main(argc,argv)
int argc;
char *argv[];
{
/* */
}
and both accomplish absolutely nothing :)

> The idea is that you remove everything but the parts relevant to your
> problem (or build a toy example from scratch). This makes it easier for a
> non-guru to verify a potential answer. That non-guru might even be yourself,
> by the way.

# child.py
import os
import sys
import array
from array import *
import Tkinter
from Tkinter import *
from Tkconstants import *
#
def AttPanel():

   def PlaceIt():
       sys.stdout.write( "Switching to ESRI for placement\n")
       sys.stdout.flush()
       sys.stdout.flush()

       #print "Switching to ESRI for placement"
       ##zatt= bl_x+bl_y+acrs+c1+c2[2:]+c3[2:]+'\n'
       zatt='123456\n'
       #print zatt
       sys.stdout.write(zatt)
       sys.stdout.flush()

       #set system variable to zatt
       root.withdraw()
       #root.iconify()
       while raw_input() != ' ':
         pass
       root.deiconify()

   def CRASH():
     print "\nCRASH Initiated\n"
     exit(1)
#
   root = Tk()

   LU = Frame(root)
   LU.pack(fill="both", expand=1)

   f1 = Frame(LU, relief = GROOVE, bd = 2)
   f1.grid(row = 0, column = 0)
   Button(f1, width= 45, state= DISABLED).grid(row= 0, column= 0)
   Button(f1, text= "Place Attribute", fg= "black", bg= "green",
          anchor= N, command = PlaceIt).grid(row = 0, column = 1)
   Button(f1, width= 45, state= DISABLED).grid(row= 0, column= 2)
   Button(f1, text= "Cancel Attributing", fg= "white", bg= "red",
          anchor= E, command= CRASH).grid(row = 0, column = 3)
   f1.pack()
   #
   root.mainloop()
#---------------#

if __name__ == "__main__":
   while TRUE:
     AttPanel()

#                              end of file


...(snip)
> It's not clear why you need to start the GUI at all as you seem to have
> control over boths scripts.
>
> Peter


Because the master has control over the production line and the child
(one stop along the way) has the purpose of pre-editing the visually
displayed but manually entered data which in turn greatly reduces post
processing problems.



The direct question comes back to:
How does one force a sync or flush() to take effect in Python with
Tkinter in use? Or just in Python period. The keyword being force.

The .force() above has absolutely no visually discernible effect during
program calling program.

Running child direct from keyboard yields correct results.
Calling child from master shows problem.

   In case you missed it - <Place Attribute> - hides widget,
                           <spacebar>        - returns widget,
                           (Cancel ---     > - exits child.
   At least on my machines (Linux and Windows XP Pro).


Steve



From Nikolaus at rath.org  Thu May 28 15:19:50 2009
From: Nikolaus at rath.org (Nikolaus Rath)
Date: Thu, 28 May 2009 15:19:50 -0400
Subject: [pyunit] Only run one specific test
References: <87k542dtzq.fsf@vostro.rath.org>
	<mailman.851.1243534574.8015.python-list@python.org>
Message-ID: <87skipc9wp.fsf@vostro.rath.org>

Dave Angel <davea at ieee.org> writes:
> Nikolaus Rath wrote:
>> Hi,
>>
>> Consider these two files:
>>
>> ,---- mytest.py -----
>> | #!/usr/bin/env python
>> | import unittest
>> | | class myTestCase(unittest.TestCase):
>> |     def test_foo(self):
>> | 	pass
>> | | # Somehow important according to pyunit documentation
>> | def suite():
>> |     return unittest.makeSuite(myTestCase)
>> `----
>>
>> ,---- runtest ---
>> | #!/usr/bin/env python
>> | import unittest
>> | | # Find and import tests
>> | modules_to_test =  [ "mytest" ]
>> | map(__import__, modules_to_test)
>> | | # Runs all tests in test/ directory
>> | def suite():
>> |     alltests = unittest.TestSuite()
>> |     for name in modules_to_test:
>> |         alltests.addTest(unittest.findTestCases(sys.modules[name]))
>> |     return alltests
>> | | if __name__ == '__main__':
>> |     unittest.main(defaultTest='suite')
>> `----
>>
>>
>> if I run runtest without arguments, it works. But according to runtest
>> --help, I should also be able to do
>>
>> ,----
>> | $ ./runtest mytest
>> | Traceback (most recent call last):
>> |   File "./runtest", line 20, in <module>
>> |     unittest.main()
>> |   File "/usr/lib/python2.6/unittest.py", line 816, in __init__
>> |     self.parseArgs(argv)
>> |   File "/usr/lib/python2.6/unittest.py", line 843, in parseArgs
>> |     self.createTests()
>> |   File "/usr/lib/python2.6/unittest.py", line 849, in createTests
>> |     self.module)
>> |   File "/usr/lib/python2.6/unittest.py", line 613, in loadTestsFromNames
>> |     suites = [self.loadTestsFromName(name, module) for name in names]
>> |   File "/usr/lib/python2.6/unittest.py", line 584, in loadTestsFromName
>> |     parent, obj = obj, getattr(obj, part)
>> | AttributeError: 'module' object has no attribute 'mytest'
>> `----
>>
>>
>> Why doesn't this work?
>>
>> Best,
>>
>>    -Nikolaus
>>
>>
>>   
> First, you're missing a    import sys in the runtest.py module.
> Without that, it won't even start.

Sorry, I must have accidentally deleted the line when I deleted empty
lines to make the example more compact.


> Now, I have no familiarity with unittest, but I took this as a
> challenge.  The way I read the code is that you need an explicit
> import of mytest if you're
> going to specify a commandline of
>    runtest mytest
>
> So I'd add two lines to the beginning of  runtest.py:
>
> import sys
> import mytest

Yes, that works indeed. But in practice the modules_to_import list is
filled by parsing the contents of a test/*.py directory. That's why I
import dynamically with __import__.

Nevertheless, you got me on the right track. After I explicitly added
the modules to the global namespace (globals()["mytest"] =
__import__("mytest")), it works fine. Thx!


Best,

   -Nikolaus

-- 
 ?Time flies like an arrow, fruit flies like a Banana.?

  PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6  02CF A9AD B7F8 AE4E 425C


From debatem1 at gmail.com  Thu May 28 15:21:24 2009
From: debatem1 at gmail.com (CTO)
Date: Thu, 28 May 2009 12:21:24 -0700 (PDT)
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de> 
	<02204669$0$25303$c3e8da3@news.astraweb.com>
	<kkb00q.g62@spenarnc.xs4all.nl> 
	<0039e85f$0$9673$c3e8da3@news.astraweb.com>
	<8cc46645-100a-46e4-9b7c-9dff7f1e2c18@z19g2000vbz.googlegroups.com>
Message-ID: <f3acf3a8-c565-47d0-a987-392e59fc497d@r3g2000vbp.googlegroups.com>

On May 28, 1:53?pm, Aaron Brady <castiro... at gmail.com> wrote:
> On May 27, 11:07?pm, Steven D'Aprano <st... at REMOVE-THIS-
>
> cybersource.com.au> wrote:
> > On Wed, 27 May 2009 12:58:02 +0000, Albert van der Horst wrote:
>
> > >>And how is reduce() supposed to know whether or not some arbitrary
> > >>function is commutative?
>
> > > Why would it or need it? A Python that understands the ``par'' keyword
> > > is supposed to know it can play some tricks with optimizing reduce() if
> > > the specific function is commutative.
>
> > Fine. Move the smarts out of reduce() into the compiler. How is the
> > compiler supposed to know if an arbitrary function is commutative?
>
> Unit testing.

I think this kind of gets to the heart of it, here- parallelization
is not a toy, runs with scissors, and will eat your dog, but so will
everything else if you don't know what you're doing. I just don't
see this as being a valid argument- maybe I'm wrong.

In the spirit of continuing to be wrong, would it be possible to
just fork off and synchronize the passed-in variables at the end
of the block via a container in shared memory? That sounds to me
like the simple, safe route, if a route must be taken.

Geremy Condra


From kyosohma at gmail.com  Thu May 28 16:10:24 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 28 May 2009 13:10:24 -0700 (PDT)
Subject: AOPython Question
References: <b5ae3174-ef46-452a-96df-c5018bbac31e@21g2000vbk.googlegroups.com>
Message-ID: <f1dde0e2-bb2b-42ce-bad5-843da35d8892@b1g2000vbc.googlegroups.com>

On May 28, 1:43?pm, Roastie <roasti... at gmail.com> wrote:
> I installed the AOPython module:
>
> ? ?% easy_install aopython
>
> That left an aopython-1.0.3-py2.6.egg at
> C:\mystuff\python\python_2.6.2\Lib\site-packages.
>
> I entered the interpreter:
>
> >>> import aopython
>
> All is well.
>
> But I was uncomfortable, since I was used to seeing directories
> of Python code for modules in site-packages, so I decided
> to read about eggs:http://mrtopf.de/blog/python_zope/a-small-introduction-to-python-eggs/
>
> The article told me to run:
> ? ? % easy_install aopython-1.0.3-py2.6.egg
> The result was a long list of error messages and removal
> of my egg, and Python could no longer use the AOPython module.
>
> So, I'm looking for a better reference for telling me about eggs and
> modules in site-packages.
>
> Roastie
> roasti... at gmail.com

The first way to do it is usually the preferred method. When you do

easy_install somePackage

the easy_install script will try to find the package on PyPI and
download the latest version. If you do the latter, you are telling
easy_install to look for that specific version. If you mis-spell the
version slightly, then you will probably have issues. I am guessing
that is why you received those error messages.

See the easy install official docs:

http://peak.telecommunity.com/DevCenter/EasyInstall

- Mike


From usenet at janc.invalid  Thu May 28 16:12:14 2009
From: usenet at janc.invalid (JanC)
Date: Thu, 28 May 2009 20:12:14 +0000 (UTC)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<pan.2009.05.26.05.01.13@REMOVE.THIS.cybersource.com.au>
	<mailman.738.1243324787.8015.python-list@python.org>
Message-ID: <gvmr6u$2dc$1@news.albasani.net>

Hendrik van Rooyen wrote:

> When ssh- ing I have been using vim, painfully. Must look at nano - sounds good.
> I really miss Brief.

Or try 'joe'.


-- 
JanC


From kyosohma at gmail.com  Thu May 28 16:12:36 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 28 May 2009 13:12:36 -0700 (PDT)
Subject: AOPython Question
References: <b5ae3174-ef46-452a-96df-c5018bbac31e@21g2000vbk.googlegroups.com>
	<f1dde0e2-bb2b-42ce-bad5-843da35d8892@b1g2000vbc.googlegroups.com>
Message-ID: <691f442f-5250-404d-82ef-3524e250c132@n19g2000vba.googlegroups.com>

On May 28, 3:10?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On May 28, 1:43?pm, Roastie <roasti... at gmail.com> wrote:
>
>
>
> > I installed the AOPython module:
>
> > ? ?% easy_install aopython
>
> > That left an aopython-1.0.3-py2.6.egg at
> > C:\mystuff\python\python_2.6.2\Lib\site-packages.
>
> > I entered the interpreter:
>
> > >>> import aopython
>
> > All is well.
>
> > But I was uncomfortable, since I was used to seeing directories
> > of Python code for modules in site-packages, so I decided
> > to read about eggs:http://mrtopf.de/blog/python_zope/a-small-introduction-to-python-eggs/
>
> > The article told me to run:
> > ? ? % easy_install aopython-1.0.3-py2.6.egg
> > The result was a long list of error messages and removal
> > of my egg, and Python could no longer use the AOPython module.
>
> > So, I'm looking for a better reference for telling me about eggs and
> > modules in site-packages.
>
> > Roastie
> > roasti... at gmail.com
>
> The first way to do it is usually the preferred method. When you do
>
> easy_install somePackage
>
> the easy_install script will try to find the package on PyPI and
> download the latest version. If you do the latter, you are telling
> easy_install to look for that specific version. If you mis-spell the
> version slightly, then you will probably have issues. I am guessing
> that is why you received those error messages.
>
> See the easy install official docs:
>
> http://peak.telecommunity.com/DevCenter/EasyInstall
>
> - Mike

I forgot to mention, but I've found that using a virtualenv for
testing new modules is very helpful and you don't end up with lots of
junk entries in your system path. Check it out too: http://pypi.python.org/pypi/virtualenv

- Mike


From piet at cs.uu.nl  Thu May 28 16:28:35 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Thu, 28 May 2009 22:28:35 +0200
Subject: what I would like python.el to do (and maybe it does)
References: <mailman.714.1243247520.8015.python-list@python.org>
	<85ljolfgaa.fsf@agentultra.com>
Message-ID: <m2prdt2cr0.fsf@cs.uu.nl>

>>>>> J Kenneth King <james at agentultra.com> (JKK) wrote:

>JKK> I find that it does work, but unlike SLIME for lisp, it just imports the statement.

>JKK> It confused me at first, but basically the interpreter doesn't provide
>JKK> any feedback to emacs.

>JKK> Try opening a python source file (start python-mode if you don't have
>JKK> an autoload hook) and do C-c C-z to bring up the Python
>JKK> interpreter. Type in a simple assignment statement (like "a = 1 + 2"
>JKK> without the quotes) into the source file. Then just C-c C-c as
>JKK> usual. I never get any feedback. Just C-x o to the interpreter and
>JKK> print out the variable you just defined. It should be there.

What kind of feedback do you expect?
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From nad at acm.org  Thu May 28 16:40:18 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 28 May 2009 13:40:18 -0700
Subject: py2app and OpenGL, "No module named util" in ctypes
References: <b09874da-5dcb-4b60-aae8-f430f1db5ba1@o20g2000vbh.googlegroups.com>
Message-ID: <nad-8E8AF2.13401828052009@news.gmane.org>

In article 
<b09874da-5dcb-4b60-aae8-f430f1db5ba1 at o20g2000vbh.googlegroups.com>,
 trhaynes <trhaynes at gmail.com> wrote:
> I'm trying to use py2app to package an OpenGL app [...]

You might try asking on the pythonmac-sig list: more py2app users there 
most likely.

http://mail.python.org/mailman/listinfo/pythonmac-sig
[or]
http://dir.gmane.org/gmane.comp.python.apple

-- 
 Ned Deily,
 nad at acm.org



From google at mrabarnett.plus.com  Thu May 28 16:44:16 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 28 May 2009 21:44:16 +0100
Subject: Python, Tkinter and popen problem
In-Reply-To: <4A1EDFFB.1060400@hughes.net>
References: <mailman.803.1243448972.8015.python-list@python.org>	<gvk2br$6bg$03$1@news.t-online.com>	<mailman.811.1243469678.8015.python-list@python.org>	<gvlnh2$n7t$02$1@news.t-online.com>
	<4A1EDFFB.1060400@hughes.net>
Message-ID: <4A1EF7A0.5090407@mrabarnett.plus.com>

norseman wrote:
[snip]
> I have tried both and Popen2.popen2().
> os.popen runs both way, contrary to docs.
> 
> # master.py
> import os
> #                both lines work same
> #xx= os.popen("/mnt/mass/py/z6.py").readlines()
> xx= os.popen("/mnt/mass/py/z6.py",'r',1).readlines()

readlines() returns only when all the lines have been read, which is
when the child quits and the pipe closes. Try reading only one line at a
time. When the pipe closes the readline() will return ''.

> #                I had hoped small buffer would force a sync (flush())
> #                No such luck.
> for i in xx:
>   print "\t"+i[:-1]
> 
> #"""
> #                              end of file
> 
> The "\t" is to prove where the screen output came from.
> 
> ========================================================
> ========================================================
> 
>  From Peter __peter__ at web.de
> 
>> Nonsense. The minimal Tkinter program is
>>
>> from Tkinter import Tk
>> root = Tk()
>> root.mainloop()
>>
> 
> Just to be clear, that's as much a minimal program as
> 
[snip]
> # child.py
> import os
> import sys
> import array
> from array import *
> import Tkinter
> from Tkinter import *
> from Tkconstants import *
> #
> def AttPanel():
> 
>   def PlaceIt():
>       sys.stdout.write( "Switching to ESRI for placement\n")
>       sys.stdout.flush()
>       sys.stdout.flush()

No need to flush twice in a row.

> 
>       #print "Switching to ESRI for placement"
>       ##zatt= bl_x+bl_y+acrs+c1+c2[2:]+c3[2:]+'\n'
>       zatt='123456\n'
>       #print zatt
>       sys.stdout.write(zatt)
>       sys.stdout.flush()
> 
>       #set system variable to zatt
>       root.withdraw()
>       #root.iconify()
>       while raw_input() != ' ':
>         pass
>       root.deiconify()
> 
>   def CRASH():
>     print "\nCRASH Initiated\n"
>     exit(1)
> #
>   root = Tk()
> 
>   LU = Frame(root)
>   LU.pack(fill="both", expand=1)
> 
>   f1 = Frame(LU, relief = GROOVE, bd = 2)
>   f1.grid(row = 0, column = 0)
>   Button(f1, width= 45, state= DISABLED).grid(row= 0, column= 0)
>   Button(f1, text= "Place Attribute", fg= "black", bg= "green",
>          anchor= N, command = PlaceIt).grid(row = 0, column = 1)
>   Button(f1, width= 45, state= DISABLED).grid(row= 0, column= 2)
>   Button(f1, text= "Cancel Attributing", fg= "white", bg= "red",
>          anchor= E, command= CRASH).grid(row = 0, column = 3)
>   f1.pack()
>   #
>   root.mainloop()
> #---------------#
> 
> if __name__ == "__main__":
>   while TRUE:
>     AttPanel()
> 


From john.center at villanova.edu  Thu May 28 16:47:20 2009
From: john.center at villanova.edu (John Center)
Date: Thu, 28 May 2009 13:47:20 -0700 (PDT)
Subject: Problem building 64-bit python 2.6.2 on Solaris 10
Message-ID: <b53cac20-3d5f-4b39-ad2c-daf954ab39d7@s28g2000vbp.googlegroups.com>

Hi,

I'm trying to build python 2.6.2 on Solaris 10 (SPARC 64), using Sun
Studio 12, but I'm having a few problems getting a clean build.  The
python configure options are:

with_gcc=no
with_universal_archs=64-bit
with_cxx_main="CC -m64"

The first problem I'm having is _ssl.so not building:

cc -m64 -xcode=pic32 -DNDEBUG -g -xs -xtarget=ultraT1 -xarch=sparcvis2
-m64 -mt
-xcode=pic32 -xmemalign=8s -xpagesize=default -I. -I/opt/ws/dists/
Python-2.6.2/.
/Include -I. -IInclude -I./Include -I/opt/db/include -I/opt/tcl8/
include -I/opt/
openssl/include -I/opt/gnu/include -I/opt/local/include -I/usr/sfw/
include -I/usr/include -I/usr/local/include -I/opt/ws/dists/
Python-2.6.2/Include -I/opt/ws/dists/Python-2.6.2 -c /opt/ws/dists/
Python-2.6.2/Modules/_ssl.c -o build/temp.solaris-2.10-sun4v-2.6/opt/
ws/dists/Python-2.6.2/Modules/_ssl.o
"/opt/ws/dists/Python-2.6.2/Modules/_ssl.c", line 1119: warning:
statement not reached
cc -m64 -G build/temp.solaris-2.10-sun4v-2.6/opt/ws/dists/Python-2.6.2/
Modules/_ssl.o -L/opt/openssl/lib/sparcv9 -L/opt/db/lib/sparcv9 -L/opt/
gnu/lib/sparcv9 -L
/opt/local/lib/sparcv9 -L/usr/sfw/lib/sparcv9 -L/usr/lib/sparcv9 -L/
usr/local/lib -L. -R/opt/db/lib/sparcv9 -R/opt/gnu/lib/sparcv9 -R/opt/
local/lib/sparcv9 -R/usr/sfw/lib/sparcv9 -R/usr/lib/sparcv9 -lssl -
lcrypto -lpython2.6 -o build/lib.so
laris-2.10-sun4v-2.6/_ssl.so

*** WARNING: renaming "_ssl" since importing it failed: ld.so.1:
python: fatal: libssl.so.0.9.8: open failed: No such file or directory

I have the openssl include & 64-bit libraries in the paths shown
above, so why this doesn't work?  What am I missing?


My next problem is building the ctypes module:

cc -m64 -xcode=pic32 -DNDEBUG -g -xs -xtarget=ultraT1 -xarch=sparcvis2
-m64 -mt
-xcode=pic32 -xmemalign=8s -xpagesize=default -I. -I/opt/ws/dists/
Python-2.6.2/.
/Include -Ibuild/temp.solaris-2.10-sun4v-2.6/libffi/include -Ibuild/
temp.solaris
-2.10-sun4v-2.6/libffi -I/opt/ws/dists/Python-2.6.2/Modules/_ctypes/
libffi/src -
I. -IInclude -I./Include -I/opt/db/include -I/opt/tcl8/include -I/opt/
openssl/include -I/opt/gnu/include -I/opt/local/include -I/usr/sfw/
include -I/usr/include
-I/usr/local/include -I/opt/ws/dists/Python-2.6.2/Include -I/opt/ws/
dists/Python
-2.6.2 -c /opt/ws/dists/Python-2.6.2/Modules/_ctypes/libffi/src/sparc/
v8.S -o build/temp.solaris-2.10-sun4v-2.6/opt/ws/dists/Python-2.6.2/
Modules/_ctypes/libffi
/src/sparc/v8.o

/opt/ws/tools/SUNWspro/prod/bin/fbe: "/opt/ws/tmp/dists/cpp0AAA.
19506.DfaqgM", l
ine 438: error: detect global register use not covered .register
pseudo-op
/opt/ws/tools/SUNWspro/prod/bin/fbe: "/opt/ws/tmp/dists/cpp0AAA.
19506.DfaqgM", l
ine 456: error: detect global register use not covered .register
pseudo-op
cc: assembler failed for /opt/ws/dists/Python-2.6.2/Modules/_ctypes/
libffi/src/s
parc/v8.S

I think the problem is it should be built with v9.S for 64-bit, not
v8.S.  Is that correct?  If so, how do I get it to use the right one?

Any help would be greatly appreciated.

    -John


From db3l.net at gmail.com  Thu May 28 17:00:08 2009
From: db3l.net at gmail.com (David Bolen)
Date: Thu, 28 May 2009 17:00:08 -0400
Subject: AOPython Question
References: <b5ae3174-ef46-452a-96df-c5018bbac31e@21g2000vbk.googlegroups.com>
Message-ID: <m2eiu9lz8n.fsf@valheru.db3l.homeip.net>

Roastie <roastie57 at gmail.com> writes:

> I installed the AOPython module:
>
>    % easy_install aopython
>
> That left an aopython-1.0.3-py2.6.egg at
> C:\mystuff\python\python_2.6.2\Lib\site-packages.

An egg is basically a ZIP file with a specific structure (you can
inspect it with common ZIP tools).  Depending on the package
easy_install is installing, it may be considered safe to install as a
single file (which Python does support importing files from).

I tend to prefer to have an actual unpacked tree myself.  If you use
the "-Z" option to easy_install, you can force it to always unpack any
eggs when installing them.

Alternatively, if you've already got the single egg, you can always
unzip it yourself.  Just rename it temporarily and unzip it into a
directory named exactly the same as the single egg file was.

-- David


From ldo at geek-central.gen.new_zealand  Thu May 28 17:04:39 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 29 May 2009 09:04:39 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<gvljmv$8hg$5@lust.ihug.co.nz>
	<003a5518$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <gvmu98$25d$1@lust.ihug.co.nz>

In message <003a5518$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano 
wrote:

> On Thu, 28 May 2009 20:58:07 +1200, Lawrence D'Oliveiro wrote:
> 
>> In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano
>> wrote:
>> 
>>> A good UI standard should mean that:
>>> 
>>> * all functionality should be discoverable without reading the manual;
>> 
>> Which means no scripting languages are allowed?
> 
> "Should", not "must".

If you meant "may or may not", why don't you say "may or may not"?



From ldo at geek-central.gen.new_zealand  Thu May 28 17:07:03 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 29 May 2009 09:07:03 +1200
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
	<gvlppt$hk0$1@news.lysator.liu.se>
Message-ID: <gvmudo$25d$2@lust.ihug.co.nz>

In message <gvlppt$hk0$1 at news.lysator.liu.se>, Thomas Bellman wrote:

> Speaking as a sysadmin, running applications for production,
> programs not using SO_REUSEADDR should be taken out and shot.

> Not using SO_REUSEADDR means forcing a service interruption of
> half an hour (IIRC) if for some reason the service must be
> restarted, or having to reboot the entire machine.

No, you do not recall correctly. And anybody wanting to reboot a machine to 
work around a "problem" like that should be taken out and shot.



From norseman at hughes.net  Thu May 28 17:25:48 2009
From: norseman at hughes.net (norseman)
Date: Thu, 28 May 2009 14:25:48 -0700
Subject: py2app and OpenGL, "No module named util" in ctypes
In-Reply-To: <nad-8E8AF2.13401828052009@news.gmane.org>
References: <b09874da-5dcb-4b60-aae8-f430f1db5ba1@o20g2000vbh.googlegroups.com>
	<nad-8E8AF2.13401828052009@news.gmane.org>
Message-ID: <4A1F015C.2020205@hughes.net>

Ned Deily wrote:
> In article 
> <b09874da-5dcb-4b60-aae8-f430f1db5ba1 at o20g2000vbh.googlegroups.com>,
>  trhaynes <trhaynes at gmail.com> wrote:
>> I'm trying to use py2app to package an OpenGL app [...]
> 
> You might try asking on the pythonmac-sig list: more py2app users there 
> most likely.
> 
> http://mail.python.org/mailman/listinfo/pythonmac-sig
> [or]
> http://dir.gmane.org/gmane.comp.python.apple
> 
=========================
trhaynes;

Re: py2app and OpenGL, "No module named util" in ctypes

That's funny:

import ctypes
help(ctypes)
    --- start screen dump ---
Help on package ctypes:

NAME
     ctypes - create and manipulate C data types in Python

FILE
     /usr/local/lib/python2.5/ctypes/__init__.py

MODULE DOCS
     /mnt/mass/py/man/py-chm/module-ctypes.html

PACKAGE CONTENTS
     _endian
     macholib (package)
     test (package)
     util                           <<<<<-------------
     wintypes

CLASSES
     __builtin__.object
         CDLL
             PyDLL
         LibraryLoader
    --- end screen dump ---

I assume py2app can't find/load it???  I wasn't in at the start of this 
thread.

If you do need it,

import ctypes
from ctypes import util

I know the *import ctypes* line is supposed to be *not needed*, but I 
find Python works more as expected with it.


I also assume you have seen .../pythonXX/distutils and dist.pdf?  Just 
in case you have not - take a look. Supposed to be how to package one's 
stuff for distribution.

At least with python 2.5.2
on Linux Slackware 10.2
Today is: 20090528



Steve


From mccredie at gmail.com  Thu May 28 17:39:30 2009
From: mccredie at gmail.com (Matimus)
Date: Thu, 28 May 2009 14:39:30 -0700 (PDT)
Subject: What is the purpose of "struct" and "array" modules
References: <mailman.852.1243534646.8015.python-list@python.org>
Message-ID: <65b44dac-a0a1-4a89-ab07-9492230f4a3c@c18g2000prh.googlegroups.com>

On May 28, 11:17?am, Igor Katson <descent... at gmail.com> wrote:
> I pretty much understand what they do, but what's the case of using
> these modules by example? Is it something like pickle, to store the data
> efficiently in files?

For one it provides a mechanism for reading and writing arbitrary file
formats. For example, suppose you wanted to parse a PNG image using
python code. It is likely that that format is described in its
specification using C data structures (I've never looked at PNG format
specifically). In python you can't just read out some data and copy it
directly into a data structure. You could use the struct module
though.

It really has nothing to do with serializing python data structures.
It is (mostly) about data formats and objects defined in other
languages.

Matt


From Scott.Daniels at Acm.Org  Thu May 28 17:51:22 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 28 May 2009 14:51:22 -0700
Subject: What is the purpose of "struct" and "array" modules
In-Reply-To: <mailman.852.1243534646.8015.python-list@python.org>
References: <mailman.852.1243534646.8015.python-list@python.org>
Message-ID: <qNqdnUV58JdgmILXnZ2dnUVZ_sCdnZ2d@pdx.net>

Igor Katson wrote:
> I pretty much understand what they do, but what's the case of using 
> these modules by example? Is it something like pickle, to store the data 
> efficiently in files?

Mostly it is for access to specific binary data structures.
If you know a particular file format, you can read it with
a combination of struct and array, ans similarly can write
in that format by such use.  So like pickle in a way, but
pickle is talking Python-to-Python, while things built with
these will be more likely Python-to-wire or wire-to-Python
when talking over a TCP/IP connection, or Python-to-file
and file-to-Python, where the other user of the file may be
a completely different program.

--Scott David Daniels
Scott.Daniels at Acm.Org


From jeffedwa at gmail.com  Thu May 28 17:54:30 2009
From: jeffedwa at gmail.com (jeffFromOz)
Date: Thu, 28 May 2009 14:54:30 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
Message-ID: <4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com>

On May 26, 10:07?pm, Lacrima <Lacrima.Ma... at gmail.com> wrote:
> I am new to python.
> And now I am using trial version of Wing IDE.
> But nobody mentioned it as a favourite editor.
> So should I buy it when trial is expired or there are better choices?

No one mentioned textmate either  . a brilliant text editor with
python templates, and bundles, syntax highlighting, etc.  We use
wingIDE for debugging and it seems fine, except for the weird way it
corrupts the displayed text.


From martin at v.loewis.de  Thu May 28 18:03:24 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Fri, 29 May 2009 00:03:24 +0200
Subject: Problem building 64-bit python 2.6.2 on Solaris 10
In-Reply-To: <b53cac20-3d5f-4b39-ad2c-daf954ab39d7@s28g2000vbp.googlegroups.com>
References: <b53cac20-3d5f-4b39-ad2c-daf954ab39d7@s28g2000vbp.googlegroups.com>
Message-ID: <4a1f0a2c$0$30886$9b622d9e@news.freenet.de>

> I think the problem is it should be built with v9.S for 64-bit, not
> v8.S.  Is that correct?  If so, how do I get it to use the right one?

The Solaris dynamic loader can't find it. Set LD_LIBRARY_PATH or
LD_RUN_PATH appropriately, or use crle(8).

Regards,
Martin


From norseman at hughes.net  Thu May 28 18:24:49 2009
From: norseman at hughes.net (norseman)
Date: Thu, 28 May 2009 15:24:49 -0700
Subject: What text editor is everyone using for Python
In-Reply-To: <4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com>
Message-ID: <4A1F0F31.6050703@hughes.net>

jeffFromOz wrote:
> On May 26, 10:07 pm, Lacrima <Lacrima.Ma... at gmail.com> wrote:
>> I am new to python.
>> And now I am using trial version of Wing IDE.
>> But nobody mentioned it as a favourite editor.
>> So should I buy it when trial is expired or there are better choices?
> 
> No one mentioned textmate either  . a brilliant text editor with
> python templates, and bundles, syntax highlighting, etc.  We use
> wingIDE for debugging and it seems fine, except for the weird way it
> corrupts the displayed text.
===========================

BOTTOM LINES:

Whatever they learned on.
Whatever they are trying out at the moment (for the adventurous types)


Suggestion:
Take a look at the top two most used OS you use and learn the default 
(most often available) text editors that come with them.


The deep quiet voice of experience yells:
Specialty items are seldom there when you need them!


Steve


From pavlovevidence at gmail.com  Thu May 28 18:28:34 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 28 May 2009 15:28:34 -0700 (PDT)
Subject: py2app and OpenGL, "No module named util" in ctypes
References: <b09874da-5dcb-4b60-aae8-f430f1db5ba1@o20g2000vbh.googlegroups.com>
Message-ID: <4b5d6a4d-975e-4459-af9a-926b19aaa7d4@y10g2000prc.googlegroups.com>

On May 28, 11:06?am, trhaynes <trhay... at gmail.com> wrote:
> I'm trying to use py2app to package an OpenGL app, so first I tried to
> build the example here
>
> http://svn.pythonmac.org/py2app/py2app/trunk/examples/PyOpenGL/
>
> and I get the error:
>
> > ?File "/opt/local/lib/python2.5/site-packages/PyOpenGL-3.0.0c1-py2.5.egg/OpenGL/platform/darwin.py", line 24, in <module>
> > ? ?import ctypes, ctypes.util
> >ImportError: No module named util
> >2009-05-28 13:55:06.819 lesson5[19965:10b] lesson5 Error
> >2009-05-28 13:55:06.821 lesson5[19965:10b] lesson5 Error
> >An unexpected error has occurred during execution of the main script
>
> >ImportError: No module named util
>
> But when I open up my python interactive interpreter and "import
> ctypes.util", it works fine (using lesson5.app/Contents/MacOS/python,
> too).
>
> Thanks for the help.

What has happened is that py2app didn't bundle ctypes.util with the
app, because py2app failed to detect that it was imported for some
reason.

A typical workaround is to imported in maually in your main script to
make it explicit to py2app that it should be packaged.

A word of caution: PyOpenGL uses entry hooks and that can cause a lot
of trouble for application builder utilities like py2exe and py2app.
In fact, I decided to stop using PyOpenGL in my projects in large part
because of that issue (I use my own OpenGL wrapper now).  It's
possible py2app has learned to deal with entry hooks by now, but these
days I refuse to use packages that require entry hooks so I wouldn't
know.


Carl Banks


From usenet at janc.invalid  Thu May 28 18:37:30 2009
From: usenet at janc.invalid (JanC)
Date: Thu, 28 May 2009 22:37:30 +0000 (UTC)
Subject: Network programming ?
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
	<a4ec6a83-7624-4529-ba1d-09b137376b78@k2g2000yql.googlegroups.com>
Message-ID: <gvn3na$srv$1@news.eternal-september.org>

CTO wrote:

> There's a book called Foundations of Python Network Programming that
> is pretty much as good a book as you could ever ask for on the subject. I
> strongly recommend it, and I think you'll find many of the examples
> relevant.

Yeah, I can recommend that book too.


-- 
JanC


From guthrie at mum.edu  Thu May 28 18:43:26 2009
From: guthrie at mum.edu (guthrie)
Date: Thu, 28 May 2009 15:43:26 -0700 (PDT)
Subject: python list pattern matching?
Message-ID: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>

I want to do a functional like pattern match to get teh first two
elements, and then the rest of an array return value.

For example, assume that perms(x) returns a list of values, and I want
to do this:
    seq=perms(x)

    a = seq[0]
    b = seq[1]
    rest = seq[2:]
Of course I can shorten to:
    [a,b] = seq[0:2]
    rest  = seq[2:]

Can I find use some notation to do this?
    [a,b,more] = perms(x)
or conceptually:
    [a,b,more..] = perms(x)

PROLOG & functional languages do list decomposition so nicely like
this!


From tjreedy at udel.edu  Thu May 28 18:57:42 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 28 May 2009 18:57:42 -0400
Subject: python list pattern matching?
In-Reply-To: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
Message-ID: <gvn4t5$tbh$1@ger.gmane.org>

guthrie wrote:
> I want to do a functional like pattern match to get teh first two
> elements, and then the rest of an array return value.
> 
> For example, assume that perms(x) returns a list of values, and I want
> to do this:
>     seq=perms(x)
> 
>     a = seq[0]
>     b = seq[1]
>     rest = seq[2:]
> Of course I can shorten to:
>     [a,b] = seq[0:2]
>     rest  = seq[2:]
> 
> Can I find use some notation to do this?
>     [a,b,more] = perms(x)
> or conceptually:
>     [a,b,more..] = perms(x)

 >>> a,b,*rest = list(range(10))
 >>> a,b,rest
(0, 1, [2, 3, 4, 5, 6, 7, 8, 9])
 >>> a,*rest,b = 'abcdefgh'
 >>> a,rest,b
('a', ['b', 'c', 'd', 'e', 'f', 'g'], 'h')



From clp2 at rebertia.com  Thu May 28 19:00:29 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 28 May 2009 16:00:29 -0700
Subject: python list pattern matching?
In-Reply-To: <gvn4t5$tbh$1@ger.gmane.org>
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
	<gvn4t5$tbh$1@ger.gmane.org>
Message-ID: <50697b2c0905281600l1fdcbe1btb1813f7dd68bf4e5@mail.gmail.com>

On Thu, May 28, 2009 at 3:57 PM, Terry Reedy <tjreedy at udel.edu> wrote:
> guthrie wrote:
>>
>> I want to do a functional like pattern match to get teh first two
>> elements, and then the rest of an array return value.
>>
>> For example, assume that perms(x) returns a list of values, and I want
>> to do this:
>> ? ?seq=perms(x)
>>
>> ? ?a = seq[0]
>> ? ?b = seq[1]
>> ? ?rest = seq[2:]
>> Of course I can shorten to:
>> ? ?[a,b] = seq[0:2]
>> ? ?rest ?= seq[2:]
>>
>> Can I find use some notation to do this?
>> ? ?[a,b,more] = perms(x)
>> or conceptually:
>> ? ?[a,b,more..] = perms(x)
>
>>>> a,b,*rest = list(range(10))
>>>> a,b,rest
> (0, 1, [2, 3, 4, 5, 6, 7, 8, 9])
>>>> a,*rest,b = 'abcdefgh'
>>>> a,rest,b
> ('a', ['b', 'c', 'd', 'e', 'f', 'g'], 'h')

Note that this snazzy new syntax requires Python 3.0+

Cheers,
Chris
-- 
http://blog.rebertia.com


From marius.s.retegan at gmail.com  Thu May 28 19:03:45 2009
From: marius.s.retegan at gmail.com (Marius Retegan)
Date: Thu, 28 May 2009 16:03:45 -0700 (PDT)
Subject: extract to dictionaries
Message-ID: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>

Hello
I have simple text file that I have to parse. It looks something like
this:

parameters1
     key1 value1
     key2 value2
end

parameters2
     key1 value1
     key2 value2
end

So I want to create two dictionaries parameters1={key1:value1,
key2:value2} and the same for parameters2.

I woud appreciate any help that could help me solve this.
Thank you



From mensanator at aol.com  Thu May 28 19:05:21 2009
From: mensanator at aol.com (Mensanator)
Date: Thu, 28 May 2009 16:05:21 -0700 (PDT)
Subject: python list pattern matching?
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
Message-ID: <bd979d2e-1280-4612-8a08-874a1df92a05@c9g2000yqm.googlegroups.com>

On May 28, 5:43?pm, guthrie <guth... at mum.edu> wrote:
> I want to do a functional like pattern match to get teh first two
> elements, and then the rest of an array return value.
>
> For example, assume that perms(x) returns a list of values, and I want
> to do this:
> ? ? seq=perms(x)
>
> ? ? a = seq[0]
> ? ? b = seq[1]
> ? ? rest = seq[2:]
> Of course I can shorten to:
> ? ? [a,b] = seq[0:2]
> ? ? rest ?= seq[2:]
>
> Can I find use some notation to do this?
> ? ? [a,b,more] = perms(x)
> or conceptually:
> ? ? [a,b,more..] = perms(x)

>>> perms = 'abcdefghijklmnopqrstuvwxyz'
>>> [a,b],more = perms[0:2],perms[2:]
>>> a
'a'
>>> b
'b'
>>> more
'cdefghijklmnopqrstuvwxyz'


>
> PROLOG & functional languages do list decomposition so nicely like
> this!



From seattlehanks at yahoo.com  Thu May 28 19:05:46 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Thu, 28 May 2009 16:05:46 -0700 (PDT)
Subject: How can 'type' be an instance of itself?
Message-ID: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>

This is probably trivial, but it's driving me mad somehow. All (new
style) classes are instances of 'type' by default, unless a custom
metaclass is specified. I take this to mean that when a class
declaration is found in the code, an instance of 'type' representing
that class is created by calling type.__init__. What really gets me is
how can 'type' be an instance of itself. In order to create 'type' we
would need to call type.__init__, but it seems at this point it
wouldn't exist. Probably a dumb question, which I hope someone can
explain in some detail.


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 19:15:14 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 May 2009 23:15:14 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<gvljmv$8hg$5@lust.ihug.co.nz>
	<003a5518$0$9673$c3e8da3@news.astraweb.com>
	<gvmu98$25d$1@lust.ihug.co.nz>
Message-ID: <003af57e$0$9673$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 09:04:39 +1200, Lawrence D'Oliveiro wrote:

> In message <003a5518$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano
> wrote:
> 
>> On Thu, 28 May 2009 20:58:07 +1200, Lawrence D'Oliveiro wrote:
>> 
>>> In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven
>>> D'Aprano wrote:
>>> 
>>>> A good UI standard should mean that:
>>>> 
>>>> * all functionality should be discoverable without reading the
>>>> manual;
>>> 
>>> Which means no scripting languages are allowed?
>> 
>> "Should", not "must".
> 
> If you meant "may or may not", why don't you say "may or may not"?


Are you a native English speaker? "Should" does not mean "may or may 
not". There is an enormous difference in meaning between e.g. "I should 
feed the dog" and "I may or may not feed the dog". The first case means 
that you have a need to feed the dog, but you are not obliged to, while 
the second case means you are indifferent to whether or not you will feed 
the dog.

(Strictly speaking, "may or may not" is redundant, although often used to 
emphasise the indifference. If you may do something, then by definition 
you also may not do it.)

The distinction between "may", "should" and "must" is also very common in 
RFCs. As a tech, I would have expected you to have been aware of that. 
For example, picking one at random, RFC 1866 (literally the first one I 
looked up!):

may
    A document or user interface is conforming whether this
    statement applies or not.

must
    Documents or user agents in conflict with this statement
    are not conforming.

should
    If a document or user agent conflicts with this
    statement, undesirable results may occur in practice
    even though it conforms to this specification.

http://www.faqs.org/rfcs/rfc1866.html

To put it another way: "may" is optional, "should" is recommended, and 
"must" is compulsory.



-- 
Steven


From bearophileHUGS at lycos.com  Thu May 28 19:24:57 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 28 May 2009 16:24:57 -0700 (PDT)
Subject: python list pattern matching?
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
	<mailman.859.1243551475.8015.python-list@python.org>
Message-ID: <3d6c5008-33cb-401d-8b87-c980ee8dcd08@g37g2000yqn.googlegroups.com>

Terry Reedy:
> ?>>> a,b,*rest = list(range(10))
> ?>>> a,b,rest
> (0, 1, [2, 3, 4, 5, 6, 7, 8, 9])
> ?>>> a,*rest,b = 'abcdefgh'
> ?>>> a,rest,b
> ('a', ['b', 'c', 'd', 'e', 'f', 'g'], 'h')

For the next few years I generally suggest to specify the Python
version too (if it's 2.x or 3.x).
This is Python 3.x.

Bye,
bearophile


From lists at cheimes.de  Thu May 28 19:37:12 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 29 May 2009 01:37:12 +0200
Subject: How can 'type' be an instance of itself?
In-Reply-To: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>
References: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>
Message-ID: <gvn779$3g5$1@ger.gmane.org>

LittleGrasshopper wrote:
> This is probably trivial, but it's driving me mad somehow. All (new
> style) classes are instances of 'type' by default, unless a custom
> metaclass is specified. I take this to mean that when a class
> declaration is found in the code, an instance of 'type' representing
> that class is created by calling type.__init__. What really gets me is
> how can 'type' be an instance of itself. In order to create 'type' we
> would need to call type.__init__, but it seems at this point it
> wouldn't exist. Probably a dumb question, which I hope someone can
> explain in some detail.

The classes 'type' and 'object' are written in C. You can do things in C
code that aren't possible from pure Python code. The circular
dependencies between 'type' and 'object' are created during the boot
strapping phase of the interpreter.

>>> type(type)
<type 'type'>
>>> type.__bases__
(<type 'object'>,)
>>> object.__bases__
()
>>> type(object)
<type 'type'>

Christian



From seattlehanks at yahoo.com  Thu May 28 19:46:34 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Thu, 28 May 2009 16:46:34 -0700 (PDT)
Subject: How can 'type' be an instance of itself?
References: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>
	<mailman.860.1243553846.8015.python-list@python.org>
Message-ID: <600ff66c-8379-4171-908f-b0beaf693c87@x31g2000prc.googlegroups.com>

On May 28, 4:37?pm, Christian Heimes <li... at cheimes.de> wrote:
> LittleGrasshopper wrote:
> > This is probably trivial, but it's driving me mad somehow. All (new
> > style) classes are instances of 'type' by default, unless a custom
> > metaclass is specified. I take this to mean that when a class
> > declaration is found in the code, an instance of 'type' representing
> > that class is created by calling type.__init__. What really gets me is
> > how can 'type' be an instance of itself. In order to create 'type' we
> > would need to call type.__init__, but it seems at this point it
> > wouldn't exist. Probably a dumb question, which I hope someone can
> > explain in some detail.
>
> The classes 'type' and 'object' are written in C. You can do things in C
> code that aren't possible from pure Python code. The circular
> dependencies between 'type' and 'object' are created during the boot
> strapping phase of the interpreter.
>
> >>> type(type)
> <type 'type'>
> >>> type.__bases__
> (<type 'object'>,)
> >>> object.__bases__
> ()
> >>> type(object)
>
> <type 'type'>
>
> Christian

That puts my mind at ease, thank you!


From bearophileHUGS at lycos.com  Thu May 28 19:59:57 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 28 May 2009 16:59:57 -0700 (PDT)
Subject: extract to dictionaries
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
Message-ID: <277f8670-0ed7-4de1-8645-b528a18c683b@f19g2000yqh.googlegroups.com>

Marius Retegan:
>
> parameters1
> ? ? ?key1 value1
> ? ? ?key2 value2
> end
>
> parameters2
> ? ? ?key1 value1
> ? ? ?key2 value2
> end
>
> So I want to create two dictionaries parameters1={key1:value1,
> key2:value2} and the same for parameters2.

I have wasted some time trying to create a regex for that. But it's
better to use normal code. Iterate on the lines, keep a dict, and when
you find a string that doesn't start with whitespace, use it to create
a new key-value into the dict, where the key is the stripped line and
the value is an empty dict. Then you can enter a sub loop or set a
"inside" boolean variable, to denote you are in a different part of
the state machine. When you find lines that start with a space, you
can put add them as key-value into the latest dict (so you have to
keep the key name in the superdict, or more efficiently you can keep
your subdict on a side, and you can add it only at the end when you
see a line "end" with no leading spaces. When you find such "end" you
can exit the sub loop or rest the "inside" boolean.
Overall if's just few lines of code, much shorter than my description
of the algorithm.

Bye,
bearophile


From gherron at islandtraining.com  Thu May 28 20:09:21 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 28 May 2009 17:09:21 -0700
Subject: extract to dictionaries
In-Reply-To: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
Message-ID: <4A1F27B1.7040005@islandtraining.com>

Marius Retegan wrote:
> Hello
> I have simple text file that I have to parse. It looks something like
> this:
>
> parameters1
>      key1 value1
>      key2 value2
> end
>
> parameters2
>      key1 value1
>      key2 value2
> end
>
> So I want to create two dictionaries parameters1={key1:value1,
> key2:value2} and the same for parameters2.
>
> I woud appreciate any help that could help me solve this.
> Thank you
>   

This looks like a homework problem.   But even if it's not, you are not 
likely to find someone who is willing to put more work into this problem 
than you have. 

So  why don't you show us what you've tried, and see if someone is 
willing to make suggestions or answer specific question about your 
attempt at a solution?

Gary Herron


From seattlehanks at yahoo.com  Thu May 28 20:20:18 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Thu, 28 May 2009 17:20:18 -0700 (PDT)
Subject: How can 'type' be an instance of itself?
References: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>
	<mailman.860.1243553846.8015.python-list@python.org>
Message-ID: <9769ee93-929a-4af7-8014-2f641cb52a2f@y6g2000prf.googlegroups.com>

On May 28, 4:37?pm, Christian Heimes <li... at cheimes.de> wrote:
> LittleGrasshopper wrote:
> > This is probably trivial, but it's driving me mad somehow. All (new
> > style) classes are instances of 'type' by default, unless a custom
> > metaclass is specified. I take this to mean that when a class
> > declaration is found in the code, an instance of 'type' representing
> > that class is created by calling type.__init__. What really gets me is
> > how can 'type' be an instance of itself. In order to create 'type' we
> > would need to call type.__init__, but it seems at this point it
> > wouldn't exist. Probably a dumb question, which I hope someone can
> > explain in some detail.
>
> The classes 'type' and 'object' are written in C. You can do things in C
> code that aren't possible from pure Python code. The circular
> dependencies between 'type' and 'object' are created during the boot
> strapping phase of the interpreter.
>
> >>> type(type)
> <type 'type'>
> >>> type.__bases__
> (<type 'object'>,)
> >>> object.__bases__
> ()
> >>> type(object)
>
> <type 'type'>
>
> Christian

And just to clarify that I do really understand what this means, I
gather that what it entails is that 'type' is an instance of itself
just from a conceptual point of view. In other words, the code for the
(meta)class 'type' is created statically by object code (compiled C
code) before the python runtime is initiated (you referred to it as
the interpreter bootstrapping phase.) I also guess that this code sets
__class__ and __metaclass__ to the 'type' object itself (I am guessing
a self-referencial pointer in C.) While I just am hypothesizing on the
details, please let me know if you sense that I have misunderstood any
essential part of your explanation.

Thanks,

Lukas


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 20:30:20 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 00:30:20 GMT
Subject: python list pattern matching?
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
	<mailman.859.1243551475.8015.python-list@python.org>
Message-ID: <003b0719$0$9673$c3e8da3@news.astraweb.com>

On Thu, 28 May 2009 18:57:42 -0400, Terry Reedy wrote:

>  >>> a,b,*rest = list(range(10))

That fails in Python 2.5 and 2.6.

>>> a,b,*rest = list(range(10))
  File "<stdin>", line 1
    a,b,*rest = list(range(10))
        ^
SyntaxError: invalid syntax




-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 20:36:07 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 00:36:07 GMT
Subject: Adding a Par construct to Python?
References: <52152a4a-334a-40d0-ad57-4b348d40eb0c@o20g2000vbh.googlegroups.com>
	<0220260f$0$20645$c3e8da3@news.astraweb.com>
	<77as23F1fhj3uU1@mid.uni-berlin.de>
	<02204669$0$25303$c3e8da3@news.astraweb.com>
	<kkb00q.g62@spenarnc.xs4all.nl>
	<0039e85f$0$9673$c3e8da3@news.astraweb.com>
	<8cc46645-100a-46e4-9b7c-9dff7f1e2c18@z19g2000vbz.googlegroups.com>
Message-ID: <003b0873$0$9673$c3e8da3@news.astraweb.com>

On Thu, 28 May 2009 10:53:17 -0700, Aaron Brady wrote:

> On May 27, 11:07?pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> On Wed, 27 May 2009 12:58:02 +0000, Albert van der Horst wrote:
>>
>> >>And how is reduce() supposed to know whether or not some arbitrary
>> >>function is commutative?
>>
>> > Why would it or need it? A Python that understands the ``par''
>> > keyword is supposed to know it can play some tricks with optimizing
>> > reduce() if the specific function is commutative.
>>
>> Fine. Move the smarts out of reduce() into the compiler. How is the
>> compiler supposed to know if an arbitrary function is commutative?
> 
> Unit testing.

(Correction: the characteristic we really care about is associativity, 
not commutativity.)

I really shouldn't reply to this, because I fear this is just going to 
drag me down into a bottomless pit, but here goes...

I don't see how unit tests can possibly help. There's an infinite number 
of possible functions that could be passed to parallel reduce(), and you 
can't test them all. Even if you lower your sights and just aim to 
recognise a tiny subset of associative functions, you end up with code 
like this:

def par_reduce(func, *args):
    if func in (operator.add, operator.mul):
        if isinstance(args[0], (int, long)):
            return _associative_par_reduce(func, *args)
    return _nonassociative_par_reduce(func, *args)

You can't even recognise functions like lambda x,y: x+y. In case you're 
thinking you can, no, "if func == lambda x,y: x+y" won't work:

>>> (lambda x,y: x+y) == (lambda x,y: x+y)
False

I suppose if you're willing to special case a tiny handful of functions, 
that's a solution of sorts, but I did ask about arbitrary functions.

Perhaps you're thinking of another approach: put the unit tests inside 
the par_reduce() function, and use them to determine at runtime whether 
or not the argument func is associative.

def par_reduce(func, *args):
    try:
        # a mass of unittests
    except Exception:
        # are we catching too much? are we masking bugs in the tests?
        return _nonassociative_par_reduce(func, *args)
    return _associative_par_reduce(func, *args)


This would be impractical, because the cost would be enormous. But even 
putting that aside, it still wouldn't work. I don't see how you could 
know what is a valid unittest for an arbitrary function, but suppose you 
could, somehow. Then what? True enough, if you run lots of tests, and it 
fails one, then you know that func is not associative. But having passed 
all those tests, you can't know if your tests covered all the possible 
cases.

E.g. for floats, you can run some tests and decide that addition looks 
associative:

>>> 0.1 + (0.1 + 0.1) == (0.1 + 0.1) + 0.1
True
>>> 0.1 + (0.9 + 0.1) == (0.1 + 0.9) + 0.1
True
>>> 0.1e67 + (0.9 + 0.3) == (0.1e67 + 0.9) + 0.3
True
>>> 0.1e54 + (0.9 + 0.1) == (0.1e54 + 0.9) + 0.1
True

but you'd be wrong:

>>> 1e54 + (-1e54 + 0.1) == (1e54 + -1e54) + 0.1
False

No, you can't expect to discover experimentally whether an arbitrary 
function is associative. You would need to analyse what the function 
does, which means in practice the *programmer* needs to decide what to 
do, not reduce().



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu May 28 20:49:37 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 00:49:37 GMT
Subject: Most pythonic way to truncate unicode?
References: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>
Message-ID: <003b0b9d$0$9673$c3e8da3@news.astraweb.com>

On Thu, 28 May 2009 08:50:00 -0700, Andrew Fong wrote:

> I need to ...
> 
> 1) Truncate long unicode (UTF-8) strings based on their length in BYTES.

Out of curiosity, why do you need to do this?


> For example, u'\u4000\u4001\u4002 abc' has a length of 7 but takes up 13
> bytes. 

No, that's wrong. The number of bytes depends on the encoding, it's not a 
property of the unicode string itself.

>>> s = u'\u4000\u4001\u4002 abc'
>>> len(s)  # characters
7
>>> len(s.encode('utf-8'))  # bytes
13
>>> len(s.encode('utf-16'))  # bytes
16
>>> len(s.encode('U32'))  # bytes
32


> Since u'\u4000' takes up 3 bytes

But it doesn't. The *encoded* unicode character *may* take up three 
bytes, or four, or possibly more, depending on what encoding you use.


-- 
Steven


From mobiledreamers at gmail.com  Thu May 28 21:47:44 2009
From: mobiledreamers at gmail.com (mobiledreamers at gmail.com)
Date: Thu, 28 May 2009 18:47:44 -0700
Subject: problems with Cheetah base class being in templates directory
Message-ID: <c1870d60905281847n6896c29dr20785b8fc1f58b7c@mail.gmail.com>

*How do we setup Cheetah so it runs with all templates in the templates
directory and all code in the .. directory

code.py*
production=True
if not production:
    try:web.render('mafbase.tmpl', None, True, 'mafbase')
    except:pass
else:
    from templates import mafbase


templates/mafbase.tmpl
templates/mafbase.py


    try:web.render('mafbase.tmpl', None, True, 'mafbase')
This works but is very slow to load and causes timeout errors


    from templates import mafbase

This doesnt work
   return self._delegate(fn, self.fvars, args)
  File "/home/mark/work/common/web/application.py", line 411, in _delegate
    return handle_class(cls)
  File "/home/mark/work/common/web/application.py", line 386, in
handle_class
    return tocall(*args)
  File "user.py", line 262, in proxyfunc
    return func(self, *args, **kw)
  File "/home/mark/work/pop/code.py", line 1796, in GET
    return web.render('subclass.html')
  File "/home/mark/work/common/web/cheetah.py", line 104, in render
    return str(compiled_tmpl)
  File
"/usr/lib/python2.5/site-packages/Cheetah-2.0.1-py2.5-linux-i686.egg/Cheetah/Template.py",
line 982, in __str__
    def __str__(self): return getattr(self, mainMethName)()
  File "mafbase.py", line 634, in respond
  File
"/usr/lib/python2.5/site-packages/Cheetah-2.0.1-py2.5-linux-i686.egg/Cheetah/Template.py",
line 1512, in _handleCheetahInclude
    nestedTemplateClass = compiler.compile(source=source,file=file)
  File
"/usr/lib/python2.5/site-packages/Cheetah-2.0.1-py2.5-linux-i686.egg/Cheetah/Template.py",
line 693, in compile
    fileHash = str(hash(file))+str(os.path.getmtime(file))
  File "/usr/lib/python2.5/posixpath.py", line 143, in getmtime
    return os.stat(filename).st_mtime
OSError: [Errno 2] No such file or directory:
'/home/mark/work/pop/widgetbox.html'



-- 
Bidegg worlds best auction site
http://bidegg.com
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From guthrie at mum.edu  Thu May 28 21:56:44 2009
From: guthrie at mum.edu (guthrie)
Date: Thu, 28 May 2009 18:56:44 -0700 (PDT)
Subject: python list pattern matching?
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
	<mailman.859.1243551475.8015.python-list@python.org>
	<003b0719$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <5b3e82b5-62c7-445f-9512-8f84b6d0805b@c36g2000yqn.googlegroups.com>

Many thanks to all; perfect solution!


From ldo at geek-central.gen.new_zealand  Thu May 28 22:00:19 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 29 May 2009 14:00:19 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<gvljmv$8hg$5@lust.ihug.co.nz>
	<003a5518$0$9673$c3e8da3@news.astraweb.com>
	<gvmu98$25d$1@lust.ihug.co.nz>
	<003af57e$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <gvnfjj$c0d$2@lust.ihug.co.nz>

In message <003af57e$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano 
wrote:

> On Fri, 29 May 2009 09:04:39 +1200, Lawrence D'Oliveiro wrote:
> 
>> In message <003a5518$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano
>> wrote:
>> 
>>> On Thu, 28 May 2009 20:58:07 +1200, Lawrence D'Oliveiro wrote:
>>> 
>>>> In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven
>>>> D'Aprano wrote:
>>>> 
>>>>> A good UI standard should mean that:
>>>>> 
>>>>> * all functionality should be discoverable without reading the
>>>>> manual;
>>>> 
>>>> Which means no scripting languages are allowed?
>>> 
>>> "Should", not "must".
>> 
>> If you meant "may or may not", why don't you say "may or may not"?
> 
> "Should" does not mean "may or may not".

I'm not sure how there is supposed to be a difference in this context. "All 
people should fly by flapping their arms, except where this is physically 
impossible". You're asking for something that is infeasible with most 
current editors, if not all of them.



From tiskanto at gmail.com  Thu May 28 22:34:21 2009
From: tiskanto at gmail.com (Teguh Iskanto)
Date: Fri, 29 May 2009 12:34:21 +1000
Subject: extract to dictionaries
In-Reply-To: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
Message-ID: <e137e8260905281934m10a653a2v684b8fe0821f3829@mail.gmail.com>

You can create this modularly by :
1. parse the file and cut this into different chunks ( look for 'end' ) then
you have two chunks for param 1 & 2
2. once you have those chunks then process each chunk with your own
processing based on your parameters ( 1 or 2 )
3. then based on your individual param, create a process to populate your
dict
4. done

hint: "pydoc string"  ( I'm assuming that you already know about regex, if
not then use this : "pydoc re"  )
BTW: I've used this methods to parse  cisco/contivity configs

HTH

On Fri, May 29, 2009 at 9:03 AM, Marius Retegan
<marius.s.retegan at gmail.com>wrote:

> Hello
> I have simple text file that I have to parse. It looks something like
> this:
>
> parameters1
>     key1 value1
>     key2 value2
> end
>
> parameters2
>     key1 value1
>     key2 value2
> end
>
> So I want to create two dictionaries parameters1={key1:value1,
> key2:value2} and the same for parameters2.
>
> I woud appreciate any help that could help me solve this.
> Thank you
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From ronn.ross at gmail.com  Thu May 28 22:48:10 2009
From: ronn.ross at gmail.com (Ronn Ross)
Date: Thu, 28 May 2009 22:48:10 -0400
Subject: Tkinter file dialog
Message-ID: <9c8c445f0905281948r537a53f9j63bc5c2209d37145@mail.gmail.com>

I'm using Tkinter file selector to get a direcotry path. I'm using:

self.file = tkFileDialog.askdirectory(title="Please select your directory")
        print file

but all it prints out is:
<type 'file'>

How would I print the directory path?

Thanks
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From sjmachin at lexicon.net  Thu May 28 23:17:35 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 29 May 2009 03:17:35 +0000 (UTC)
Subject: Most pythonic way to truncate unicode?
References: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>
Message-ID: <loom.20090529T025751-848@post.gmane.org>

Andrew Fong <FongAndrew <at> gmail.com> writes:


> I need to ...
> 1) Truncate long unicode (UTF-8) strings based on their length in
> BYTES.
> 2) I don't want to accidentally chop any unicode characters in half.
> If the byte truncate length would normally cut a unicode character in
> 2, then I just want to drop the whole character, not leave an orphaned
> byte. 
> I'm using Python2.6, so I have access to things like bytearray.

Using bytearray saves you from using ord()
but runs the risk of accidental mutation.

> Are
> there any built-in ways to do something like this already? Or do I
> just have to iterate over the unicode string?

Converting each character to utf8 and checking the
total number of bytes so far?
Ooooh, sloooowwwwww!

The whole concept of "truncating unicode"
you mean "truncating utf8") seems
rather unpythonic to me. 

Another alternative is to iterate backwards
over the utf8 string looking for a
character-starting byte. It leads to a candidate
for Unpythonic Code of the Year:

def utf8trunc(u8s, maxlen):
    assert maxlen >= 1
    alen = len(u8s)
    if alen <= maxlen:
        return u8s
    pos = maxlen - 1
    while pos >= 0:
        val = ord(u8s[pos])
        if val & 0xC0 != 0x80:
            # found an initial byte
            break
        pos -= 1
    else:
        # no initial byte found
        raise ValueError("malformed UTF-8 [1]")
    if maxlen - pos > 4:
        raise ValueError("malformed UTF-8 [2]")
    if val & 0x80:
        charlen = (2, 2, 3, 4)[(val >> 4) & 3]
    else:
        charlen = 1
    nextpos = pos + charlen
    assert nextpos >= maxlen
    if nextpos == maxlen:
        return u8s[:nextpos]
    return u8s[:pos]

if __name__ == "__main__":
    tests = [u"", u"\u0000", u"\u007f", u"\u0080",
        u"\u07ff", u"\u0800", u"\uffff" ]
    for testx in tests:
        test = u"abcde" + testx + u"pqrst"
        u8 = test.encode('utf8')
        print repr(test), repr(u8), len(u8)
        for mlen in range(4,
            8 + len(testx.encode('utf8'))):
            u8t = utf8trunc(u8, mlen)
            print "    ", mlen, len(u8t), repr(u8t)

Tested to the extent shown. Doesn't pretend to check
for all cases of UTF-8
malformation, just easy ones :-)

Cheers,
John



From clp2 at rebertia.com  Thu May 28 23:44:38 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 28 May 2009 20:44:38 -0700
Subject: Tkinter file dialog
In-Reply-To: <9c8c445f0905281948r537a53f9j63bc5c2209d37145@mail.gmail.com>
References: <9c8c445f0905281948r537a53f9j63bc5c2209d37145@mail.gmail.com>
Message-ID: <50697b2c0905282044k2f47e681u5e5aedb4b301ca82@mail.gmail.com>

On Thu, May 28, 2009 at 7:48 PM, Ronn Ross <ronn.ross at gmail.com> wrote:
> I'm using Tkinter file selector to get a direcotry path. I'm using:
>
> self.file = tkFileDialog.askdirectory(title="Please select your directory")
> ??????? print file
>
> but all it prints out is:
> <type 'file'>
>
> How would I print the directory path?

print self.file

Your forgot the "self." in your version. Without it, Python assumes
you're talking about built-in `file` type.

Cheers,
Chris
-- 
http://blog.rebertia.com


From sjmachin at lexicon.net  Fri May 29 00:09:53 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 29 May 2009 04:09:53 +0000 (UTC)
Subject: Most pythonic way to truncate unicode?
References: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>
	<loom.20090529T025751-848@post.gmane.org>
Message-ID: <loom.20090529T035246-680@post.gmane.org>

John Machin <sjmachin <at> lexicon.net> writes:

> Andrew Fong <FongAndrew <at> gmail.com> writes:

 > Are
> > there any built-in ways to do something like this already? Or do I
> > just have to iterate over the unicode string?
> 
> Converting each character to utf8 and checking the
> total number of bytes so far?
> Ooooh, sloooowwwwww!
> 

Somewhat faster:

u8len = 0
for u in unicode_string:
   if u <= u'\u007f':
      u8len += 1
   elif u <= u'\u07ff':
      u8len += 2
   elif u <= u'\uffff':
      u8len += 3
   else:
      u8len += 4

Cheers,
John



From steve at REMOVE-THIS-cybersource.com.au  Fri May 29 00:22:39 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 04:22:39 GMT
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<gvljmv$8hg$5@lust.ihug.co.nz>
	<003a5518$0$9673$c3e8da3@news.astraweb.com>
	<gvmu98$25d$1@lust.ihug.co.nz>
	<003af57e$0$9673$c3e8da3@news.astraweb.com>
	<gvnfjj$c0d$2@lust.ihug.co.nz>
Message-ID: <003b3d8c$0$9673$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 14:00:19 +1200, Lawrence D'Oliveiro wrote:

> In message <003af57e$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano
> wrote:
> 
>> On Fri, 29 May 2009 09:04:39 +1200, Lawrence D'Oliveiro wrote:
>> 
>>> In message <003a5518$0$9673$c3e8da3 at news.astraweb.com>, Steven
>>> D'Aprano wrote:
>>> 
>>>> On Thu, 28 May 2009 20:58:07 +1200, Lawrence D'Oliveiro wrote:
>>>> 
>>>>> In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven
>>>>> D'Aprano wrote:
>>>>> 
>>>>>> A good UI standard should mean that:
>>>>>> 
>>>>>> * all functionality should be discoverable without reading the
>>>>>> manual;
>>>>> 
>>>>> Which means no scripting languages are allowed?
>>>> 
>>>> "Should", not "must".
>>> 
>>> If you meant "may or may not", why don't you say "may or may not"?
>> 
>> "Should" does not mean "may or may not".
> 
> I'm not sure how there is supposed to be a difference in this context.
> "All people should fly by flapping their arms, except where this is
> physically impossible". You're asking for something that is infeasible
> with most current editors, if not all of them.


On the remote chance that you're not trolling, I deny that 
discoverablity is "infeasible", for editors or other applications. Making 
a UI discoverable is not a hard problem that is difficult to solve. 
Discoverablity isn't radical new concept in UI design, it has been 
around since the 1970s, at least.

The concept is simple: e.g. in the editor I'm using to compose this 
message, I have a toolbar which includes a button "Wrap Text". That's 
discoverable, because even if I didn't know the command existed, I could 
discover it by looking at the toolbar. There's a keyboard command to do 
the same thing: Alt-E-W. Without reading the manual, I'm unlikely to 
discover that command.

Here's a couple of screenshots of Wordstar:

http://www.kantl.be/ctb/vanhoutte/teach/slides/graphics/wstar.gif
http://www.iee.et.tu-dresden.de/~kc-club/08/PCX/WORDSTAR.GIF

Wordstar's commands are discoverable, because they are listed in a menu 
you can choose from. Wordstar dates back to 1978, so this isn't precisely 
the cutting edge of UI design.

As a general rule, menus are discoverable, while keyboard commands 
aren't. There's nothing inherent to text editing functions which makes 
then inherently undiscoverable, and KDE apps like kate and kwrite do a 
reasonable job of making them so.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri May 29 00:27:58 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 04:27:58 GMT
Subject: Most pythonic way to truncate unicode?
References: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>
	<loom.20090529T025751-848@post.gmane.org>
	<mailman.866.1243570209.8015.python-list@python.org>
Message-ID: <003b3ecb$0$9673$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 04:09:53 +0000, John Machin wrote:

> John Machin <sjmachin <at> lexicon.net> writes:
> 
>> Andrew Fong <FongAndrew <at> gmail.com> writes:
> 
>  > Are
>> > there any built-in ways to do something like this already? Or do I
>> > just have to iterate over the unicode string?
>> 
>> Converting each character to utf8 and checking the total number of
>> bytes so far?
>> Ooooh, sloooowwwwww!
>> 
>> 
> Somewhat faster:

What's wrong with Peter Otten's solution?

>>> u"???".encode("utf8")[:5].decode("utf8", "ignore")
u'\xe4\xf6'

At most, you should have one error, at the very end. If you ignore it, 
you get the unicode characters that have length <= 5 in *bytes* when 
encoded as UTF-8.

(If you encode using a different codec, you will likely get a different 
number of bytes.)


-- 
Steven


From jdoe at usenetlove.invalid  Fri May 29 01:15:50 2009
From: jdoe at usenetlove.invalid (John Doe)
Date: Fri, 29 May 2009 05:15:50 GMT
Subject: Messages from Python Macros, always on top?
Message-ID: <acKTl.30780$yr3.20334@nlpi068.nbdc.sbc.com>

Anyone here familiar with Messages from Python Macros?

Can you make that window Always on Top?

Thanks.


From sjmachin at lexicon.net  Fri May 29 01:31:40 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 29 May 2009 05:31:40 +0000 (UTC)
Subject: Most pythonic way to truncate unicode?
References: <e617dc1e-8979-49c3-a1b1-7a7deaaceea0@m17g2000vbi.googlegroups.com>
	<loom.20090529T025751-848@post.gmane.org>
	<mailman.866.1243570209.8015.python-list@python.org>
	<003b3ecb$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <loom.20090529T052054-967@post.gmane.org>

Steven D'Aprano <steve <at> REMOVE-THIS-cybersource.com.au> writes:

> 
> On Fri, 29 May 2009 04:09:53 +0000, John Machin wrote:
> 
> > John Machin <sjmachin <at> lexicon.net> writes:
> > 
> >> Andrew Fong <FongAndrew <at> gmail.com> writes:
> > 
> >  > Are
> >> > there any built-in ways to do something like this already? Or do I
> >> > just have to iterate over the unicode string?
> >> 
> >> Converting each character to utf8 and checking the total number of
> >> bytes so far?
> >> Ooooh, sloooowwwwww!
> >> 
> >> 
> > Somewhat faster:
> 
> What's wrong with Peter Otten's solution?
> 
> >>> u"???".encode("utf8")[:5].decode("utf8", "ignore")

Given the minimal info supplied by the OP, nothing. However if the OP were to
respond to your "why" question, and give some more info like how long is long,
what percentage of the average string is thrown away, does he have the utf8
version anyway, what's he going to do with the unicode version after it's been
truncated (convert it to utf8??), it may turn out that a unicode forwards search
or a utf8 backwards search may be preferable.

If Pyrex/Cython is an option, then one of those is likely to be preferable if
runtime is a major consideration.

Cheers,
John



From gagsl-py2 at yahoo.com.ar  Fri May 29 01:37:12 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 28 May 2009 22:37:12 -0700 (PDT)
Subject: Building mySQL-python with python 2.6
References: <ae374ba5-2a1f-4611-b089-116792bb89f8@j32g2000yqh.googlegroups.com>
	<mailman.793.1243429122.8015.python-list@python.org>
	<9-6dnT0O5_7YxYDXnZ2dnUVZ_tti4p2d@pdx.net> 
	<103438d3-7fdb-4963-b2f1-41bcb41903f4@f19g2000yqh.googlegroups.com>
Message-ID: <9bcdd671-0fe2-4c72-be55-d27a92ff5c3c@3g2000yqk.googlegroups.com>

On 28 mayo, 02:16, abolotnov <abolot... at gmail.com> wrote:

> say I obtain and install "an alternative" compiler. how do I tell
> python which one to use?

VS2008 Express Edition is available for free from the Microsoft site.

--
Gabriel Genellina


From tiskanto at gmail.com  Fri May 29 01:52:46 2009
From: tiskanto at gmail.com (Teguh Iskanto)
Date: Fri, 29 May 2009 15:52:46 +1000
Subject: DB-API execute params, am I missing something?
In-Reply-To: <gvnrco$890$1@ger.gmane.org>
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
	<gvkoep$oii$3@lust.ihug.co.nz>
	<mailman.819.1243494051.8015.python-list@python.org>
	<gvljl9$8hg$4@lust.ihug.co.nz> <gvnrco$890$1@ger.gmane.org>
Message-ID: <e137e8260905282252l7f1667bi502191d114fbaa85@mail.gmail.com>

On Fri, May 29, 2009 at 3:21 PM, Dennis Lee Bieber <wlfraed at ix.netcom.com>wrote:

>
>        This won't work as the DB-API is going to quote the parameter, and
> the final result would be '%'whatever'%'. Essentially, you must put the
> wildcard marker on the actual parameter before feeding it to the API.
> --
>        Wulfraed        Dennis Lee Bieber               KD6MOG
>        wlfraed at ix.netcom.com           wulfraed at bestiaria.com
>                HTTP://wlfraed.home.netcom.com/
>        (Bestiaria Support Staff:               web-asst at bestiaria.com)
>                HTTP://www.bestiaria.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


it works for me :)

mysql> select * from test_table ;
+------+------+------+
| a    | b    | c    |
+------+------+------+
| 0    | 0    | 0    |
| 1    | 1    | 1    |
| 2    | 2    | 2    |
| 3    | 3    | 3    |
| 4    | 4    | 4    |
| 5    | 5    | 5    |
| 6    | 6    | 6    |
| 7    | 7    | 7    |
| 8    | 8    | 8    |
| 9    | 9    | 9    |
| 10   | 10   | 10   |
| 11   | 11   | 11   |
| 12   | 12   | 12   |
| 13   | 13   | 13   |
| 14   | 14   | 14   |
| 15   | 15   | 15   |
| 16   | 16   | 16   |
| 17   | 17   | 17   |
| 18   | 18   | 18   |
| 19   | 19   | 19   |
| 20   | 20   | 20   |
| 21   | 21   | 21   |
| 22   | 22   | 22   |
| 23   | 23   | 23   |
| 24   | 24   | 24   |
| 25   | 25   | 25   |
| 26   | 26   | 26   |
| 27   | 27   | 27   |
| 28   | 28   | 28   |
| 29   | 29   | 29   |
+------+------+------+
30 rows in set (0.00 sec)


>>> import MySQLdb
>>> conn = MySQLdb.connect (host='localhost', user='root', passwd='crappy',
db='testme')
>>> input_crap = "0"
>>> conn.query("select * from test_table where a like '%%%s%%'" %input_crap)
>>> result = conn.store_result()
>>> rows = result.num_rows()
>>> cols = result.num_fields()
>>> data = result.fetch_row(rows,1)
>>> print data
({'a': '0', 'c': '0', 'b': '0'}, {'a': '10', 'c': '10', 'b': '10'}, {'a':
'20', 'c': '20', 'b': '20'})
>>>

HTH
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From tjreedy at udel.edu  Fri May 29 02:07:27 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 29 May 2009 02:07:27 -0400
Subject: How can 'type' be an instance of itself?
In-Reply-To: <9769ee93-929a-4af7-8014-2f641cb52a2f@y6g2000prf.googlegroups.com>
References: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>	<mailman.860.1243553846.8015.python-list@python.org>
	<9769ee93-929a-4af7-8014-2f641cb52a2f@y6g2000prf.googlegroups.com>
Message-ID: <gvnu2v$dk7$1@ger.gmane.org>

LittleGrasshopper wrote:
> On May 28, 4:37 pm, Christian Heimes <li... at cheimes.de> wrote:
>> LittleGrasshopper wrote:
>>> This is probably trivial, but it's driving me mad somehow. All (new
>>> style) classes are instances of 'type' by default, unless a custom
>>> metaclass is specified. I take this to mean that when a class

type(ob) simply looks up ob.__class__.  For built-in classes, that is 
all it means.

>>> declaration is found in the code, an instance of 'type' representing
>>> that class is created by calling type.__init__. What really gets me is
>>> how can 'type' be an instance of itself. In order to create 'type' we
>>> would need to call type.__init__, but it seems at this point it
>>> wouldn't exist. Probably a dumb question, which I hope someone can
>>> explain in some detail.

Actually, it is type.__new__ that creates the new object (as is true of 
all classes).  .__init__, when present, initializes mutable objects 
already created by .__new__.

This is a perceptive, not a dumb question.

>> The classes 'type' and 'object' are written in C. You can do things in C
>> code that aren't possible from pure Python code. The circular
>> dependencies between 'type' and 'object' are created during the boot
>> strapping phase of the interpreter.

In other words, the interpreter is god with respect to built-in objects. 
  For instance, the interpreter has to mutate 'immutable' objects in 
order to give then their immutable (thereafter) values.  So setting 
type.__class__ to type itself is no more of a big deal than the above, 
or setting any builtin.__class__ to type.

>>>>> type(type)
>> <type 'type'>
>>>>> type.__bases__
>> (<type 'object'>,)
>>>>> object.__bases__
>> ()
>>>>> type(object)
>> <type 'type'>
>>
>> Christian
> 
> And just to clarify that I do really understand what this means, I
> gather that what it entails is that 'type' is an instance of itself
> just from a conceptual point of view.

In regard to their creation, yes.  But thereafter, isinstance(type, 
type) is as concretely True as for anything.

tjr


> In other words, the code for the
> (meta)class 'type' is created statically by object code (compiled C
> code) before the python runtime is initiated (you referred to it as
> the interpreter bootstrapping phase.) I also guess that this code sets
> __class__ and __metaclass__ to the 'type' object itself (I am guessing
> a self-referencial pointer in C.) While I just am hypothesizing on the
> details, please let me know if you sense that I have misunderstood any
> essential part of your explanation.
> 
> Thanks,
> 
> Lukas



From __peter__ at web.de  Fri May 29 02:27:34 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 29 May 2009 08:27:34 +0200
Subject: Python, Tkinter and popen problem
References: <mailman.803.1243448972.8015.python-list@python.org>
	<gvk2br$6bg$03$1@news.t-online.com>
	<mailman.811.1243469678.8015.python-list@python.org>
	<gvlnh2$n7t$02$1@news.t-online.com>
	<mailman.855.1243537386.8015.python-list@python.org>
Message-ID: <gvnv7f$p5f$00$1@news.t-online.com>

norseman wrote:

> The direct question comes back to:
> How does one force a sync or flush() to take effect in Python with
> Tkinter in use? Or just in Python period. The keyword being force.

Here's some truly minimal code which shows the same buffering behaviour:

$ cat master.py
#!/usr/bin/env python
import os
for line in os.popen("./child.py"):
    print "-->", line.strip()

$ cat child.py
#!/usr/bin/env python
import time

for i in range(5):
    print i
    time.sleep(.2)

On Linux you can work around it with pexpect:

$ cat master2.py
#!/usr/bin/env python
import pexpect
for line in pexpect.spawn("./child.py"):
    print "-->", line.strip()

On Windows, I don't know.

Peter




From seattlehanks at yahoo.com  Fri May 29 02:31:11 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Thu, 28 May 2009 23:31:11 -0700 (PDT)
Subject: How can 'type' be an instance of itself?
References: <7bffebd3-dc4a-4ddd-9273-f501977274d3@d25g2000prn.googlegroups.com>
	<mailman.860.1243553846.8015.python-list@python.org>
	<9769ee93-929a-4af7-8014-2f641cb52a2f@y6g2000prf.googlegroups.com>
	<mailman.870.1243577260.8015.python-list@python.org>
Message-ID: <81652a27-7415-415f-8487-ba15584e0fe9@x5g2000yqk.googlegroups.com>

On May 28, 11:07?pm, Terry Reedy <tjre... at udel.edu> wrote:
> LittleGrasshopper wrote:
> > On May 28, 4:37 pm, Christian Heimes <li... at cheimes.de> wrote:
> >> LittleGrasshopper wrote:
> >>> This is probably trivial, but it's driving me mad somehow. All (new
> >>> style) classes are instances of 'type' by default, unless a custom
> >>> metaclass is specified. I take this to mean that when a class
>
> type(ob) simply looks up ob.__class__. ?For built-in classes, that is
> all it means.
>
> >>> declaration is found in the code, an instance of 'type' representing
> >>> that class is created by calling type.__init__. What really gets me is
> >>> how can 'type' be an instance of itself. In order to create 'type' we
> >>> would need to call type.__init__, but it seems at this point it
> >>> wouldn't exist. Probably a dumb question, which I hope someone can
> >>> explain in some detail.
>
> Actually, it is type.__new__ that creates the new object (as is true of
> all classes). ?.__init__, when present, initializes mutable objects
> already created by .__new__.
>
> This is a perceptive, not a dumb question.
>
> >> The classes 'type' and 'object' are written in C. You can do things in C
> >> code that aren't possible from pure Python code. The circular
> >> dependencies between 'type' and 'object' are created during the boot
> >> strapping phase of the interpreter.
>
> In other words, the interpreter is god with respect to built-in objects.
> ? For instance, the interpreter has to mutate 'immutable' objects in
> order to give then their immutable (thereafter) values. ?So setting
> type.__class__ to type itself is no more of a big deal than the above,
> or setting any builtin.__class__ to type.
>
> >>>>> type(type)
> >> <type 'type'>
> >>>>> type.__bases__
> >> (<type 'object'>,)
> >>>>> object.__bases__
> >> ()
> >>>>> type(object)
> >> <type 'type'>
>
> >> Christian
>
> > And just to clarify that I do really understand what this means, I
> > gather that what it entails is that 'type' is an instance of itself
> > just from a conceptual point of view.
>
> In regard to their creation, yes. ?But thereafter, isinstance(type,
> type) is as concretely True as for anything.
>
> tjr
>
> > In other words, the code for the
> > (meta)class 'type' is created statically by object code (compiled C
> > code) before the python runtime is initiated (you referred to it as
> > the interpreter bootstrapping phase.) I also guess that this code sets
> > __class__ and __metaclass__ to the 'type' object itself (I am guessing
> > a self-referencial pointer in C.) While I just am hypothesizing on the
> > details, please let me know if you sense that I have misunderstood any
> > essential part of your explanation.
>
> > Thanks,
>
> > Lukas
>
>

Terry,

Thanks a lot for clarifying this further. I believe I understand
exactly what is going on now. What you say about the C compiler being
god (which is basically saying what Christian said in an even more
emphatic way) really puts things in perspective.

Regards,

Lukas


From __peter__ at web.de  Fri May 29 02:35:33 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 29 May 2009 08:35:33 +0200
Subject: python list pattern matching?
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>
	<mailman.859.1243551475.8015.python-list@python.org>
Message-ID: <gvnvme$p5f$00$2@news.t-online.com>

Terry Reedy wrote:

>  >>> a,b,*rest = list(range(10))

The list() call is superfluous.



From gabriel.rossetti at arimaz.com  Fri May 29 02:47:35 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Fri, 29 May 2009 08:47:35 +0200
Subject: DB-API execute params, am I missing something?
In-Reply-To: <7826h5F1kcp57U1@mid.uni-berlin.de>
References: <mailman.745.1243338813.8015.python-list@python.org>
	<7826h5F1kcp57U1@mid.uni-berlin.de>
Message-ID: <4A1F8507.8030406@arimaz.com>

Diez B. Roggisch wrote:
> Gabriel Rossetti wrote:
>
>   
>> Hello everyone, I am trying to use dbapi with mysql and I get this error:
>>
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>>   File "<stdin>", line 2, in getUnitParams
>>   File "/var/lib/python-support/python2.5/MySQLdb/cursors.py", line 151,
>> in execute
>>     query = query % db.literal(args)
>> TypeError: int argument required
>>
>> with this code :
>>
>> import MySQLdb
>>
>> def getParams(curs):
>>     curs.execute("select * from param where id=%d", 1001)
>>     return curs.fetchall()
>>
>> cp = MySQLdb.connect(host="localhost",
>>                      port=3306,
>>                      user="root",
>>                      passwd="123",
>>                      db="test")
>>
>> curs = cp.cursor()
>> result = getParams(curs)
>>
>> I checked MySQLdb.paramstyle and it uses "format". I also tried passing
>> (1001,) instead of just 1001 as the param but this changes nothing. What
>> am I doing wrong?
>>     
>
> AFAIK you need to use %s, regardless of what type you pass.
>
> Diez
>   
Ok, thank you, that was the problem. I also learned not to put the 
quotes in the SQL statement (e.g. SELECT * FROM toto WHERE 
toto.name='%s') since the call to literal() adds them :-)

Thank you,
Gabriel


From gabriel.rossetti at arimaz.com  Fri May 29 02:48:45 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Fri, 29 May 2009 08:48:45 +0200
Subject: DB-API execute params, am I missing something?
In-Reply-To: <a5e204d6-29df-4637-81cd-8b8c1f485a1a@k38g2000yqh.googlegroups.com>
References: <mailman.745.1243338813.8015.python-list@python.org>
	<a5e204d6-29df-4637-81cd-8b8c1f485a1a@k38g2000yqh.googlegroups.com>
Message-ID: <4A1F854D.9000505@arimaz.com>

Paul Boddie wrote:
> On 26 Mai, 13:46, Gabriel Rossetti <gabriel.rosse... at arimaz.com>
> wrote:
>   
>> def getParams(curs):
>>     curs.execute("select * from param where id=%d", 1001)
>>     
>
> First of all, you should use the database module's parameter style,
> which is probably "%s" - something I've thought should be deprecated
> for a long time due to the confusion with string substitution that
> this causes, regardless of whether that mechanism is actually used
> internally by the module (as seen in your traceback).
>
> You also have to provide a sequence of parameters: unlike string
> substitution, you cannot provide a single parameter value and expect
> the execute method to do the right thing. Some database modules seem
> to insist on either lists or tuples of parameters, but I think any
> sequence type should work.
>
> Try this:
>
>   curs.execute("select * from param where id=%s", (1001,))
>
> Paul
>   
Thank you for the explanation Paul!

Gabriel


From urbangabo at gmail.com  Fri May 29 02:57:18 2009
From: urbangabo at gmail.com (Gabor Urban)
Date: Fri, 29 May 2009 08:57:18 +0200
Subject: What text editor is everyone using for Python
Message-ID: <f7ac28aa0905282357n1150e0d4r2d187909563a64ba@mail.gmail.com>

Hi guys,

I would like to reflect this issue for the last time, though I found
this thread to be quite inspiring.

In one the last postings about this topic Steven D'Aprano has written:
"As a general rule, menus are discoverable, while
keyboard commands aren't. There's nothing inherent to text editing
functions which makes then inherently undiscoverable,
and KDE apps like kate and kwrite do a reasonable job of making them so."

I agree with this assumption if, and only if we are speaking about
outsider users.

This is a Python mailing list, which supposed to be a forum of people
using the Python programming language. So Python
source is a plain text, so Python interpreter should be a
command-driven application. With no other UI than the plain old
Command Line Intreface.

MOre than that, all we are supposed to be techmen, who does
acknowledge and appreciate the conceot of wrtitten User Manual or
Reference. All we have learned Python from tutorials and not from the menues.

As a summary, any open source editor should be perfect, which is
extensible, optionally language-sensitive, portable, basically
independent of any OS features. THat cuts the list drammatically.

Gabor


From ben+python at benfinney.id.au  Fri May 29 03:41:48 2009
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 29 May 2009 17:41:48 +1000
Subject: What text editor is everyone using for Python
References: <mailman.873.1243580240.8015.python-list@python.org>
Message-ID: <878wkgwe2r.fsf@benfinney.id.au>

Gabor Urban <urbangabo at gmail.com> writes:

> This is a Python mailing list, which supposed to be a forum of people
> using the Python programming language.

Agreed so far.

> As a summary, any open source editor should be perfect, which is
> extensible, optionally language-sensitive, portable, basically
> independent of any OS features. THat cuts the list drammatically.

With this paragraph I can agree.

> So Python source is a plain text, so Python interpreter should be a
> command-driven application.

Huh? The Python interpreter should be a command-line application, true.
But the fact that Python source code is text has nothing to do with
that.

> With no other UI than the plain old Command Line Intreface.

This doesn't follow at all. I am convinced that I'm far more productive
in my full-window editing environment over needing to use a command-line
to do everything. Where does ?should? come into that, and why is a
full-window environment excluded?

If, instead of ?command-line?, you actually mean ?text-mode
full-window console?, I'm still calling you on your non sequitur.
There's nothing about editing text that excludes using a graphical
interface rendered in pixels instead of text characters.

The closest I get to agreement with any of the above is that a
full-window text editing environment should never *require* any
graphical pixellated interface. But to *exclude* it is too much.

> MOre than that, all we are supposed to be techmen, who does
> acknowledge and appreciate the conceot of wrtitten User Manual or
> Reference. All we have learned Python from tutorials and not from the
> menues.

You seem to have a rather exclusionist idea of the Python community,
that does not match my experience at all. Python programmers are women
as well as men. Many Python programmers would not describe themselves as
?technical? people. And I know for a fact many of the good ones
learned by example, not from tutorials.

-- 
 \       ?Courage is resistance to fear, mastery of fear ? not absence |
  `\                        of fear. ?Mark Twain, _Pudd'n'head Wilson_ |
_o__)                                                                  |
Ben Finney


From steve at REMOVE-THIS-cybersource.com.au  Fri May 29 04:01:06 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 08:01:06 GMT
Subject: What text editor is everyone using for Python
References: <mailman.873.1243580240.8015.python-list@python.org>
Message-ID: <003b70c0$0$9673$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 08:57:18 +0200, Gabor Urban wrote:

> In one the last postings about this topic Steven D'Aprano has written:
> "As a general rule, menus are discoverable, while keyboard commands
> aren't. There's nothing inherent to text editing functions which makes
> then inherently undiscoverable, and KDE apps like kate and kwrite do a
> reasonable job of making them so."
> 
> I agree with this assumption if, and only if we are speaking about
> outsider users.

It's not an assumption, it's a conclusion. My assumption is that 
everybody, no matter how experienced they are, will *at some time* be 
looking for some editor functionality without knowing whether or not it 
exists. I've never needed to (say) strip out all comments from a 
document, but if I ever do, if the editor makes functions discoverable, 
I've got a better chance of finding the command I need, rather than 
wasting my time programming something that's been done before.

We all know of experienced system admins who have built-up an amazingly 
detailed amount of knowledge about the systems they've used. They can 
tell you about the most obscure features and functions of a system. But 
put them in a system which is *not quite the same* (say, Ubuntu instead 
of Redhat, or FreeBSD instead of Linux), and they often flounder. All the 
functions they're used to are in a different place, so to speak. And 
there's no easy way to learn that command ABC on one system is precisely 
the same as command XYZ on another.

Only two sorts of people don't benefit from ease of discoverablity: those 
who know everything, and those who never do anything new.


> This is a Python mailing list, which supposed to be a forum of people
> using the Python programming language. So Python source is a plain text,
> so Python interpreter should be a command-driven application. With no
> other UI than the plain old Command Line Intreface.

That Python is command-driven doesn't have *any* implications for the 
editor you use to write Python code. Photo-editing software is mouse-
driven. That doesn't mean that you should be forced to write photo-
editing programs by point-and-click.


> MOre than that, all we are supposed to be techmen, who does acknowledge
> and appreciate the conceot of wrtitten User Manual or Reference. All we
> have learned Python from tutorials and not from the menues.

We're probably better at reading manuals than average people, but that 
doesn't mean we *like* it. That's one of the reasons we use Python: 
nearly everything is discoverable from inside the Python runtime 
environment. We have a wealth of tools for inspecting objects. If you 
want to know what methods an object has, you don't have to look it up in 
the manual, you can inspect it with dir().

Besides, once you've been in the tech industry for long enough, you'll 
learn that the Python documentation is *remarkably* good compared to the 
average technical documentation.


> As a summary, any open source editor should be perfect, which is
> extensible, optionally language-sensitive, portable, basically
> independent of any OS features. THat cuts the list drammatically.

(1) Closed source editors have the same functional requirements as open 
source editors.

(2) If you're waiting for perfection, you'll be waiting forever.

(3) Why independent of the OS? When is the last time you've used a system 
without an OS? Forth programmers in the 1970s used an editor that was OS 
independent -- it managed files using its own unique file structure, 
managed memory itself, etc. Why do you want to go back there?


-- 
Steven


From deets at nospam.web.de  Fri May 29 04:02:43 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 29 May 2009 10:02:43 +0200
Subject: AOPython Question
In-Reply-To: <b5ae3174-ef46-452a-96df-c5018bbac31e@21g2000vbk.googlegroups.com>
References: <b5ae3174-ef46-452a-96df-c5018bbac31e@21g2000vbk.googlegroups.com>
Message-ID: <789j53F1lg3ikU1@mid.uni-berlin.de>

Roastie schrieb:
> I installed the AOPython module:
> 
>    % easy_install aopython
> 
> That left an aopython-1.0.3-py2.6.egg at
> C:\mystuff\python\python_2.6.2\Lib\site-packages.
> 
> I entered the interpreter:
> 
>>>> import aopython
>>>>
> 
> All is well.
> 
> But I was uncomfortable, since I was used to seeing directories
> of Python code for modules in site-packages, so I decided
> to read about eggs:
> http://mrtopf.de/blog/python_zope/a-small-introduction-to-python-eggs/
> 
> The article told me to run:
>     % easy_install aopython-1.0.3-py2.6.egg

Did you run that in the site-packages-directory? If yes, that was a 
mistake. The above command is supposed to work on downloaded eggs that 
lie around somewhere.

> The result was a long list of error messages and removal
> of my egg, and Python could no longer use the AOPython module.
> 
> So, I'm looking for a better reference for telling me about eggs and
> modules in site-packages.

You did everything alright the first time.

Diez


From lie.1296 at gmail.com  Fri May 29 04:53:48 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Fri, 29 May 2009 08:53:48 GMT
Subject: What text editor is everyone using for Python
In-Reply-To: <mailman.858.1243549462.8015.python-list@python.org>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>	<4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com>
	<mailman.858.1243549462.8015.python-list@python.org>
Message-ID: <woNTl.14450$y61.392@news-server.bigpond.net.au>

norseman wrote:
> jeffFromOz wrote:
>> On May 26, 10:07 pm, Lacrima <Lacrima.Ma... at gmail.com> wrote:
>>> I am new to python.
>>> And now I am using trial version of Wing IDE.
>>> But nobody mentioned it as a favourite editor.
>>> So should I buy it when trial is expired or there are better choices?
>>
>> No one mentioned textmate either  . a brilliant text editor with
>> python templates, and bundles, syntax highlighting, etc.  We use
>> wingIDE for debugging and it seems fine, except for the weird way it
>> corrupts the displayed text.
> ===========================
> 
> BOTTOM LINES:
> 
> Whatever they learned on.
> Whatever they are trying out at the moment (for the adventurous types)
> 
> 
> Suggestion:
> Take a look at the top two most used OS you use and learn the default
> (most often available) text editors that come with them.

Which means Notepad on Windows?


From jonas.esp at googlemail.com  Fri May 29 05:34:53 2009
From: jonas.esp at googlemail.com (Kless)
Date: Fri, 29 May 2009 02:34:53 -0700 (PDT)
Subject: Global variables from a class
Message-ID: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>

I usually use a class to access to global variables. So, which would
be the correct way to set them --since the following classes--:

--------------------
class Foo:
   var = 'lala'

class Bar:
   def __init__(self):
      self.var = 'lele'
--------------------

Or is it the same?


From ldo at geek-central.gen.new_zealand  Fri May 29 05:45:13 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 29 May 2009 21:45:13 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvgrl2$15je$1@services.telesweet.net>
	<0aada0e3-5407-4aa0-8c4d-2c654907ceb4@21g2000vbk.googlegroups.com>
	<mailman.801.1243447733.8015.python-list@python.org>
	<ee143dd0-bafb-4506-9859-e15a54811728@b1g2000vbc.googlegroups.com>
	<mailman.815.1243479884.8015.python-list@python.org>
	<0039e83c$0$9673$c3e8da3@news.astraweb.com>
	<gvljmv$8hg$5@lust.ihug.co.nz>
	<003a5518$0$9673$c3e8da3@news.astraweb.com>
	<gvmu98$25d$1@lust.ihug.co.nz>
	<003af57e$0$9673$c3e8da3@news.astraweb.com>
	<gvnfjj$c0d$2@lust.ihug.co.nz>
	<003b3d8c$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <gvoar9$s27$1@lust.ihug.co.nz>

In message <003b3d8c$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano 
wrote:

> On Fri, 29 May 2009 14:00:19 +1200, Lawrence D'Oliveiro wrote:
> 
>> In message <003af57e$0$9673$c3e8da3 at news.astraweb.com>, Steven D'Aprano
>> wrote:
>> 
>>> On Fri, 29 May 2009 09:04:39 +1200, Lawrence D'Oliveiro wrote:
>>> 
>>>> In message <003a5518$0$9673$c3e8da3 at news.astraweb.com>, Steven
>>>> D'Aprano wrote:
>>>> 
>>>>> On Thu, 28 May 2009 20:58:07 +1200, Lawrence D'Oliveiro wrote:
>>>>> 
>>>>>> In message <0039e83c$0$9673$c3e8da3 at news.astraweb.com>, Steven
>>>>>> D'Aprano wrote:
>>>>>> 
>>>>>>> A good UI standard should mean that:
>>>>>>> 
>>>>>>> * all functionality should be discoverable without reading the
>>>>>>> manual;
>>>>>> 
>>>>>> Which means no scripting languages are allowed?
>>>>> 
>>>>> "Should", not "must".
>>>> 
>>>> If you meant "may or may not", why don't you say "may or may not"?
>>> 
>>> "Should" does not mean "may or may not".
>> 
>> I'm not sure how there is supposed to be a difference in this context.
>> "All people should fly by flapping their arms, except where this is
>> physically impossible". You're asking for something that is infeasible
>> with most current editors, if not all of them.
> 
> On the remote chance that you're not trolling, I deny that
> discoverablity is "infeasible" ...

On the remote chance you're not trolling, let me point out politely that it 
is for scriptability.



From ldo at geek-central.gen.new_zealand  Fri May 29 05:46:13 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 29 May 2009 21:46:13 +1200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
	<gvkoep$oii$3@lust.ihug.co.nz>
	<mailman.819.1243494051.8015.python-list@python.org>
	<gvljl9$8hg$4@lust.ihug.co.nz>
	<mailman.867.1243574504.8015.python-list@python.org>
Message-ID: <gvoat5$s27$2@lust.ihug.co.nz>

In message <mailman.867.1243574504.8015.python-list at python.org>, Dennis Lee 
Bieber wrote:

> On Thu, 28 May 2009 20:57:13 +1200, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> declaimed the following in
> gmane.comp.python.general:
> 
>>> 
>>>    >>> db.literal((... "%wildcard%" ...))
>>>    (... "'%wildcard%'" ...)
>> 
>> Doesn't look like it worked, does it?
> 
> If the problem is that you have /user/ input that may have a % sign
> that should NOT be treated as a wildcard, the solution is to train said
> user...

Sounds like a good solution to SQL-injection vulnerabilities, isn't it? 
Wonder why no-one thought of that before?



From piet at cs.uu.nl  Fri May 29 05:49:04 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 29 May 2009 11:49:04 +0200
Subject: Python, Tkinter and popen problem
References: <mailman.803.1243448972.8015.python-list@python.org>
	<gvk2br$6bg$03$1@news.t-online.com>
	<mailman.811.1243469678.8015.python-list@python.org>
	<gvlnh2$n7t$02$1@news.t-online.com>
	<mailman.855.1243537386.8015.python-list@python.org>
Message-ID: <m2d49sck8f.fsf@cs.uu.nl>

>>>>> norseman <norseman at hughes.net> (n) wrote:

>n> I have tried both and Popen2.popen2().
>n> os.popen runs both way, contrary to docs.

What do you mean `os.popen runs both way'?

>n> # master.py
>n> import os
>n> #                both lines work same

Of course, because 'r' is the default, and the bufsize for reading the
pipe only influences the performance.

>n> #xx= os.popen("/mnt/mass/py/z6.py").readlines()
>n> xx= os.popen("/mnt/mass/py/z6.py",'r',1).readlines()
>n> #                I had hoped small buffer would force a sync (flush())
>n> #                No such luck.

First, there is a difference between sync and flush. flush is writing
out any output that is buffered in the application program for that
file. Sync is writing out buffers (cache) in the operating system (to the
disc, network connection or similar). We are talking here about
flushing, not syncing. As we deal with a pipe, sync is not applicable.

Furthermore, whatever you do in the master program, such as setting the
buffer size has nothing to do with what happens in the child, so it will
not influence the flushing behaviour of the child. The only way to
influence that would be to use a pty instead of a pipe, because most
code uses a different buffering strategy for ttys and ptys compared to
files and pipes.

The next error in your program is that you use readlines()
This reads ALL input from your pipe before it proceeds. So essentially
it waits until the child process is finished and therefore gives you the
impression that it doesn't flush(). But it is not the child that is the
problem it is your master.

What you should do is take the pipe and do a readline()/print loop.

#xx= os.popen("/mnt/mass/py/z6.py")

# popen is deprecated. Replace with subprocess:
from subprocess import Popen, PIPE
xx = Popen(["/mnt/mass/py/z6.py"], stdout=PIPE).stdout

while True:
    line = xx.readline()
    if not line: break
    print "\t" + line,

The obvious:

for l in xx:
    print "\t" + l,

doesn't work as the iterator for a file, including pipes, does a
read ahead (see the doc on file.next()) and therefore is not suitable for
interactive use.

>n> The direct question comes back to:

>n> How does one force a sync or flush() to take effect in Python with
>n> Tkinter in use? Or just in Python period. The keyword being force.

So it should be clear by now that the answer is to use flush().
And make sure you read AND process the flushed output in a proper way.

By the way, you have a nasty habit of using very unclear language to
pose your problems in this newsgroup/mailing list, instead of writing a
concise description and giving small examples of what code causes the
problem. This makes it extremely difficult to help you. I had to read
your messages at least 5 times to get an idea of what you were doing and
what the problem was that you wanted to solve.

Maybe you are dyslectic or something similar, in which case I apologize.
But anyway, I think you should learn to express yourself more clearly.
There are also courses for that.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From dahl.joachim at gmail.com  Fri May 29 05:52:15 2009
From: dahl.joachim at gmail.com (Joachim Dahl)
Date: Fri, 29 May 2009 02:52:15 -0700 (PDT)
Subject: FILE object in Python3.0 extension modules
Message-ID: <ce7a9fa5-0e35-47b4-bd4e-a68415aca1d5@h11g2000yqb.googlegroups.com>

In Python2.x, I used PyFile_Check(obj) to check if a parameter was a
file object.

Now, in Python3.0 the same object (obtained as open('file.bin','wb'))
is an
io.BufferedWriter object.

How do I perform type checking for such an object in the extension
module,
and how do I extract a FILE * object from it?  I browsed the C API
documentation,  but
couldn't find an answer.

The purpose is to dump the contents of a Python extension type to disk
as
binary data using C's fwrite() function.


From google at mrabarnett.plus.com  Fri May 29 05:58:11 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 29 May 2009 10:58:11 +0100
Subject: Tkinter file dialog
In-Reply-To: <9c8c445f0905281948r537a53f9j63bc5c2209d37145@mail.gmail.com>
References: <9c8c445f0905281948r537a53f9j63bc5c2209d37145@mail.gmail.com>
Message-ID: <4A1FB1B3.1010100@mrabarnett.plus.com>

Ronn Ross wrote:
> I'm using Tkinter file selector to get a direcotry path. I'm using:
> 
> self.file = tkFileDialog.askdirectory(title="Please select your directory")
>         print file
> 
> but all it prints out is:
> <type 'file'>
> 
> How would I print the directory path?
> 
Perhaps you meant:

     self.file = tkFileDialog.askdirectory(title="Please select your 
directory")
     print self.file


From piet at cs.uu.nl  Fri May 29 05:58:33 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 29 May 2009 11:58:33 +0200
Subject: Global variables from a class
References: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
Message-ID: <m28wkgcjsm.fsf@cs.uu.nl>

>>>>> Kless <jonas.esp at googlemail.com> (K) wrote:

>K> I usually use a class to access to global variables. So, which would
>K> be the correct way to set them --since the following classes--:

>K> --------------------
>K> class Foo:
>K>    var = 'lala'

>K> class Bar:
>K>    def __init__(self):
>K>       self.var = 'lele'
>K> --------------------

>K> Or is it the same?

I don't see any global variable in your code. 
var is a class variable (attribute) in Foo, whereas in Bar var is an
instance variable (attribute). These are two different things. However a
class variable acts as a kind of default for an instance variable. If
all your instances have the same value for var, Foo is a good way to
accomplish this. If they are all different, the Bar is the way to go.

You can also mix them if several of the instances use the same value
'lala' but some need 'lele' or sometime later in the life of the instance
the value will be changed to 'lele'

class Bletch:
    var = 'lala'

    def update(self):
        self.var = 'lele'

In this case it is a matter of taste whether you use the Foo or the Bar
way.

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From javier.collado at gmail.com  Fri May 29 06:04:53 2009
From: javier.collado at gmail.com (Javier Collado)
Date: Fri, 29 May 2009 12:04:53 +0200
Subject: Global variables from a class
In-Reply-To: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
References: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
Message-ID: <c83cde5a0905290304i1806ae12gaa81b2e5c2f3a19a@mail.gmail.com>

Hello,

First thing is a class variable (one for every instance) and second
one an instance variable (one per instance).

For further information, please take a look at:
http://diveintopython.org/object_oriented_framework/class_attributes.html

Best regards,
   Javier

2009/5/29 Kless <jonas.esp at googlemail.com>:
> I usually use a class to access to global variables. So, which would
> be the correct way to set them --since the following classes--:
>
> --------------------
> class Foo:
> ? var = 'lala'
>
> class Bar:
> ? def __init__(self):
> ? ? ?self.var = 'lele'
> --------------------
>
> Or is it the same?
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From marius.s.retegan at gmail.com  Fri May 29 06:44:30 2009
From: marius.s.retegan at gmail.com (Marius Retegan)
Date: Fri, 29 May 2009 12:44:30 +0200
Subject: extract to dictionaries
In-Reply-To: <4A1F27B1.7040005@islandtraining.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
	<4A1F27B1.7040005@islandtraining.com>
Message-ID: <52298ae10905290344s8d6ef34ma6f16aa2f51be9e5@mail.gmail.com>

Hi,

On Fri, May 29, 2009 at 2:09 AM, Gary Herron <gherron at islandtraining.com>wrote:

> Marius Retegan wrote:
>
>> Hello
>> I have simple text file that I have to parse. It looks something like
>> this:
>>
>> parameters1
>>     key1 value1
>>     key2 value2
>> end
>>
>> parameters2
>>     key1 value1
>>     key2 value2
>> end
>>
>> So I want to create two dictionaries parameters1={key1:value1,
>> key2:value2} and the same for parameters2.
>>
>> I would appreciate any help that could help me solve this.
>> Thank you
>>
>>
>
> This looks like a homework problem.


It's not. I'm passed homework age.


>   But even if it's not, you are not likely to find someone who is willing
> to put more work into this problem than you have.
> So  why don't you show us what you've tried, and see if someone is willing
> to make suggestions or answer specific question about your attempt at a
> solution?
>

I don't now if posting a code that gets into a while loop and never stops
would demonstrate to you that I've tried. Be assured that before posting to
the list I did try to solve it myself, because I knew that I might get an
answer like RTFM or similar.
Maybe I'm not smart enough, but I can't make python to start reading after
the "parameter1" line and stop at the "end" line. That's all I want a small
piece of pseudocode to do just that.

Thanks


>
> Gary Herron
>
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From insfor at gmail.com  Fri May 29 06:44:56 2009
From: insfor at gmail.com (Sergey Dikovitsky)
Date: Fri, 29 May 2009 13:44:56 +0300
Subject: PYTHONPATH var
Message-ID: <fd06ce4c0905290344k2d03dcc0t580b2022526c04e2@mail.gmail.com>

Hi guys. I have a question regarding runtime definition of the variable
PYTHONPATH. Do you know how without modifying of source code change the
value for this var. Value stores in the system var sys.path, but the first
item of this list, path[0], is the directory containing the script that was
used to invoke the Python interpreter. We need to change this value which
allows to us import scripts first from directory containing newest hotfix
scripts without replacing original project scripts. One of the variant is to
create script which will modify this var and insert line with import this
script into each project script. So the question does another way exist? For
example, parameter or argument for python launcher.
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From insfor at gmail.com  Fri May 29 06:50:54 2009
From: insfor at gmail.com (insfor at gmail.com)
Date: Fri, 29 May 2009 03:50:54 -0700 (PDT)
Subject: PYTHONPATH var
Message-ID: <20ab0178-1967-4be1-a4f3-e817c94a4339@z14g2000yqa.googlegroups.com>

Hi guys. I have a question regarding runtime definition of the
variable PYTHONPATH. Do you know how without modifying of source code
change the value for this var. Value stores in the system var
sys.path, but the first item of this list, path[0], is the directory
containing the script that was used to invoke the Python interpreter.
We need to change this value which allows to us import scripts first
from directory containing newest hotfix scripts without replacing
original project scripts. One of the variant is to create script which
will modify this var and insert line with import this script into each
project script. So the question does another way exist? For example,
parameter or argument for python launcher.


From mail at microcorp.co.za  Fri May 29 07:00:07 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 29 May 2009 13:00:07 +0200
Subject: Tkinter file dialog
References: <9c8c445f0905281948r537a53f9j63bc5c2209d37145@mail.gmail.com>
Message-ID: <001601c9e04c$a3b5b260$0d00a8c0@Hendrik>

 Ronn Ross  wrote:

>I'm using Tkinter file selector to get a direcotry path. I'm using:
>
>self.file = tkFileDialog.askdirectory(title="Please select your directory")
>        print file
>
>but all it prints out is:
><type 'file'>
>
>How would I print the directory path?

try doing:

self.filename = tkFileDialog.askopenfilename(title = 'this is a
message',initialdir='./' )

and see what happens

- Hendrik



From benjamin at python.org  Fri May 29 07:48:26 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Fri, 29 May 2009 11:48:26 +0000 (UTC)
Subject: FILE object in Python3.0 extension modules
References: <ce7a9fa5-0e35-47b4-bd4e-a68415aca1d5@h11g2000yqb.googlegroups.com>
Message-ID: <loom.20090529T114655-291@post.gmane.org>

Joachim Dahl <dahl.joachim <at> gmail.com> writes:
> 
> How do I perform type checking for such an object in the extension
> module,
> and how do I extract a FILE * object from it?  I browsed the C API
> documentation,  but
> couldn't find an answer.

You use PyObject_IsInstance to test if the object is an instance of io.IOBase.






From rhodri at wildebst.demon.co.uk  Fri May 29 08:10:47 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 29 May 2009 13:10:47 +0100
Subject: extract to dictionaries
In-Reply-To: <52298ae10905290344s8d6ef34ma6f16aa2f51be9e5@mail.gmail.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
	<4A1F27B1.7040005@islandtraining.com>
	<52298ae10905290344s8d6ef34ma6f16aa2f51be9e5@mail.gmail.com>
Message-ID: <op.uuoxf9kpa8ncjz@gnudebst>

On Fri, 29 May 2009 11:44:30 +0100, Marius Retegan  
<marius.s.retegan at gmail.com> wrote:

> Hi,
>
> On Fri, May 29, 2009 at 2:09 AM, Gary Herron  
> <gherron at islandtraining.com>wrote:
>
>> Marius Retegan wrote:
>>
>>> Hello
>>> I have simple text file that I have to parse. It looks something like
>>> this:
>>>
>>> parameters1
>>>     key1 value1
>>>     key2 value2
>>> end
>>>
>>> parameters2
>>>     key1 value1
>>>     key2 value2
>>> end
>>>
>>> So I want to create two dictionaries parameters1={key1:value1,
>>> key2:value2} and the same for parameters2.
>>>
>>> I would appreciate any help that could help me solve this.
>>> Thank you
>>>
>>>
>>
>> This looks like a homework problem.
>
>
> It's not. I'm passed homework age.
>
>
>>   But even if it's not, you are not likely to find someone who is  
>> willing
>> to put more work into this problem than you have.
>> So  why don't you show us what you've tried, and see if someone is  
>> willing
>> to make suggestions or answer specific question about your attempt at a
>> solution?
>>
>
> I don't now if posting a code that gets into a while loop and never stops
> would demonstrate to you that I've tried.

It would have.  At the very least, it would have told us that you've
missed a common idiom.

> Be assured that before posting to
> the list I did try to solve it myself, because I knew that I might get an
> answer like RTFM or similar.

Not posting code (or code snippets at least) makes it more likely that  
you'll
be told to RTFM, you do realise!

> Maybe I'm not smart enough, but I can't make python to start reading  
> after
> the "parameter1" line and stop at the "end" line. That's all I want a  
> small
> piece of pseudocode to do just that.


I'd be tempted to do it like this

dict_of_dicts = {}
current_dict = {}
current_name = "dummy"

f = open(filename)
for line in f:
   # Do something to skip blank lines
   if line == '\n':
     continue

   # A normal 'key value' pair?
   if line.startswith(' '):
     # Yup.  Split apart the key and value,
     # and add them to the current dictionary
     current_dict.update([line.split()])
   elif line == 'end':
     # Wrap up what we've got and save the dictionary
     dict_of_dicts[current_name] = current_dict
     current_name = dummy
     current_dict = {}
   else:
     # New section.  Really ought to whinge if
     # we haven't ended the old section.
     current_name = line.strip()
     current_dict = {}

You can then pull the parameter sets you want out of
dict_of_dicts (you can probably think of a more meaningful
name for it, but I don't know the context you're working in).
In real code I would use regular expressions rather than
`startswith` and the equality because they cope more easily
with tabs, newlines and other 'invisible' whitespace.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Fri May 29 08:15:03 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 29 May 2009 13:15:03 +0100
Subject: extract to dictionaries
In-Reply-To: <op.uuoxf9kpa8ncjz@gnudebst>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
	<4A1F27B1.7040005@islandtraining.com>
	<52298ae10905290344s8d6ef34ma6f16aa2f51be9e5@mail.gmail.com>
	<op.uuoxf9kpa8ncjz@gnudebst>
Message-ID: <op.uuoxndika8ncjz@gnudebst>

On Fri, 29 May 2009 13:10:47 +0100, Rhodri James  
<rhodri at wildebst.demon.co.uk> wrote:

>      current_name = dummy

Gah!  I meant, of course,
       current_name = 'dummy'

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From john.center at villanova.edu  Fri May 29 08:35:06 2009
From: john.center at villanova.edu (John Center)
Date: Fri, 29 May 2009 05:35:06 -0700 (PDT)
Subject: Problem building 64-bit python 2.6.2 on Solaris 10
References: <b53cac20-3d5f-4b39-ad2c-daf954ab39d7@s28g2000vbp.googlegroups.com>
	<4a1f0a2c$0$30886$9b622d9e@news.freenet.de>
Message-ID: <d618518b-540c-46f1-aebc-576667da030b@o14g2000vbo.googlegroups.com>

On May 28, 6:03?pm, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > I think the problem is it should be built with v9.S for 64-bit, not
> > v8.S. ?Is that correct? ?If so, how do I get it to use the right one?
>
> The Solaris dynamic loader can't find it. Set LD_LIBRARY_PATH or
> LD_RUN_PATH appropriately, or use crle(8).
>
> Regards,
> Martin

Hi Martin,

I'm not sure I understand.  It appears that cc is compiling the wrong
module, v8.S.  It should be compiling v9.S.  The errors are being
reported by fbe, the Sun Studio assembler, not ld.  I think there must
be a place to specify which I want to use, but I don't understand the
python build environment well enough to know where to do it.

You may be right about the first error.  It's being reported by ld,
but -L/opt/openssl/lib/sparcv9 & -R/opt/openssl/lib/sparcv9 are being
passed to cc.  It is able to find -lssl & -lcrypto, but I think python
itself doesn't use the openssl libraries.  Since I see the chain
"ld.so.1: python: fatal: libssl.so.0.9.8: open failed: No such file or
directory", which I think means python itself doesn't know where they
are at.  I checked python & libpython.so with ldd & neither uses
libssl.so.  It seems to me there should be another way to tell python
where to find it to build the module.  Does this make sense?

Thanks for your help.

    -John


From steve at REMOVE-THIS-cybersource.com.au  Fri May 29 08:42:53 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 12:42:53 GMT
Subject: Global variables from a class
References: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
	<mailman.883.1243594929.8015.python-list@python.org>
Message-ID: <003bb2cb$0$9673$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 12:04:53 +0200, Javier Collado wrote:

> Hello,
> 
> First thing is a class variable (one for every instance) and second one
> an instance variable (one per instance).

One of these things don't belong:

A string variable is a variable holding a string.
A float variable is a variable holding a float.
An int variable is a variable holding an int.
A list variable is a variable holding a list.
A "class variable" is an attribute of a class object, holding an
  object of arbitrary type, which is shared by all instances 
  of the class.

Please don't use the term "class variable" to mean class attribute.



-- 
Steven


From aahz at pythoncraft.com  Fri May 29 08:44:14 2009
From: aahz at pythoncraft.com (Aahz)
Date: 29 May 2009 05:44:14 -0700
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>
	<c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com>
	<mailman.717.1243258005.8015.python-list@python.org>
Message-ID: <gvolau$hvn$1@panix3.panix.com>

In article <mailman.717.1243258005.8015.python-list at python.org>,
Tim Chase  <python.list at tim.thechases.com> wrote:
>
>To stave off this problem, I often use:
>
>   values = [
>    data['a'],
>    data['b'],
>    data['c'],
>    data['d'],
>    data['e'],
>    data['f'],
>    data['g'],
>    ]
>   params = ', '.join('%s' for _ in values)
>   query = """
>     BEGIN;
>       INSERT INTO table
>         (a,b,c,d,e,f,g)
>       VALUES (%s);
>     COMMIT;
>     """ % params
>   self.db.execute(query, values)

How do you handle correct SQL escaping?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From aahz at pythoncraft.com  Fri May 29 08:53:37 2009
From: aahz at pythoncraft.com (Aahz)
Date: 29 May 2009 05:53:37 -0700
Subject: Syntax highlighting,
	round 42 (was Re: What text editor is everyone using for Python)
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg2cs$1a0$2@lust.ihug.co.nz>
	<pan.2009.05.26.06.39.41@REMOVE.THIS.cybersource.com.au>
	<gvg5d7$382$2@lust.ihug.co.nz>
Message-ID: <gvolsh$fml$1@panix3.panix.com>

In article <gvg5d7$382$2 at lust.ihug.co.nz>,
Lawrence D'Oliveiro  <ldo at geek-central.gen.new_zealand> wrote:
>In message <pan.2009.05.26.06.39.41 at REMOVE.THIS.cybersource.com.au>, Steven 
>D'Aprano wrote:
>> On Tue, 26 May 2009 18:31:56 +1200, Lawrence D'Oliveiro wrote:
>>> In message <d6d05d39-98e7-4c28-
>>> b201-4b2445732ab4 at v35g2000pro.googlegroups.com>, LittleGrasshopper
>>> wrote:
>>>> 
>>>> ... I am looking for suitable syntax files for [editor of choice] ...
>>> 
>>> I don't understand why people need "syntax files" to use a text editor.
>> 
>> Do you want syntax highlighting?
>
>Why?

Didn't we have this discussion just a few weeks ago, when I said that
highlighting made my eyes bleed?  [....]  Oh, Gooja sez that we did it at
the beginning of February, so almost four months.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From jeanmichel at sequans.com  Fri May 29 08:55:34 2009
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 29 May 2009 14:55:34 +0200
Subject: Global variables from a class
In-Reply-To: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
References: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
Message-ID: <4A1FDB46.3080102@sequans.com>

Kless wrote:
> I usually use a class to access to global variables. So, which would
> be the correct way to set them --since the following classes--:
>
> --------------------
> class Foo:
>    var = 'lala'
>
> class Bar:
>    def __init__(self):
>       self.var = 'lele'
> --------------------
>
> Or is it the same?
>   

This form is the most suited for what your doing:

> class Foo:
>   var = 'lala'

It is a good practice to place your globals into a class (making them non global by the way). It helps also writing good documentation in docstrings.

I would add:

> class Foo:
>   """Hold the secrets of eternity"""
>   var = 'lala'
>   """One variable"""
>   ANY_CONSTANT = 14
>   """The universal answer to all questions"""

Having strong naming convention also helps a lot.

Jean-Michel

PS: FYI, in the second form, var is an instance variable, and you need to create an instance to access it => Bar().var while Foo.var is enough for the first form.



From steve at REMOVE-THIS-cybersource.com.au  Fri May 29 08:55:51 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 May 2009 12:55:51 GMT
Subject: PYTHONPATH var
References: <20ab0178-1967-4be1-a4f3-e817c94a4339@z14g2000yqa.googlegroups.com>
Message-ID: <003bb5d5$0$9673$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 03:50:54 -0700, insfor wrote:

> Hi guys. I have a question regarding runtime definition of the variable
> PYTHONPATH. Do you know how without modifying of source code change the
> value for this var.

"Syntax error:  sentence seems to be a question, but is missing a 
question mark."

To answer your question, PYTHONPATH is an environment variable. You set 
it in your shell. For example, I use the bash shell under Linux, and in 
my .bashrc file I have this line:

export PYTHONPATH=/home/steve/python/

Every time I log in, the shell sets the environment variable to the 
pathname /home/steve/python/, and then when Python runs, it appends that 
path to sys.path. I don't have to modify any Python source code.



> Value stores in the system var sys.path, but the
> first item of this list, path[0], is the directory containing the script
> that was used to invoke the Python interpreter. We need to change this
> value which allows to us import scripts first from directory containing
> newest hotfix scripts without replacing original project scripts. One of
> the variant is to create script which will modify this var and insert
> line with import this script into each project script. So the question
> does another way exist? For example, parameter or argument for python
> launcher.

I don't understand what you are actually trying to say here. Perhaps you 
can explain a little bit more carefully?


However, trying to guess what you want, PYTHONPATH doesn't *replace* 
sys.path, it appends to the end of it. This is usually the right thing to 
do. However, sys.path is an ordinary list. If you want to modify it, you 
can do so:

import sys
sys.path[0] = '/some/other/path'



-- 
Steven


From twic at urchin.earth.li  Fri May 29 08:56:29 2009
From: twic at urchin.earth.li (Tom Anderson)
Date: Fri, 29 May 2009 13:56:29 +0100
Subject: Parsing DTDs
Message-ID: <alpine.DEB.1.10.0905291352130.14054@urchin.earth.li>

Hello!

I would like to parse XML DTDs. The goal is to be able to validate 
XML-like object structures against DTDs in a fairly flexible way, although 
i can get from a parsed DTD to a validation engine myself, so that's not 
an essential feature of the parser (although it would be nice!). What 
should i do?

A bit of googling revealed that the xmlproc package contains a DTD parser 
that looks like it does just what i want, and that xmlproc became PyXML, 
and that PyXML is no longer maintained.

Is there a DTD parser that is being maintained? Or does it not really 
matter that PyXML is no longer maintained, given that it's not like the 
DTD spec has changed very much?

Thanks,
tom

-- 
Many of us adopted the File's slang as our own, feeling that we'd found a
tangible sign of the community of minds we'd half-guessed to be out there.


From davea at ieee.org  Fri May 29 09:00:41 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 29 May 2009 09:00:41 -0400
Subject: Global variables from a class
In-Reply-To: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
References: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
Message-ID: <4A1FDC79.10105@ieee.org>

Kless wrote:
> I usually use a class to access to global variables. So, which would
> be the correct way to set them --since the following classes--:
>
> --------------------
> class Foo:
>    var = 'lala'
>
> class Bar:
>    def __init__(self):
>       self.var = 'lele'
> --------------------
>
> Or is it the same?
>
>   
What Python calls global variables are attributes of a module.  So other 
modules can access them by using the module name, eg..  globalModule.var

If you're trying to make them independent of file name, so others can 
access them without knowing what module they are defined in, you can 
create a class Foo approach.  Then somehow (there are several easy ways) 
you get a reference to that class into each module, and they can use 
Foo.var to access the attributes of the class.  You still have a 
reserved name the other modules need to know, it just doesn't have to be 
a module itself.  And if the data is defined in the initial script, it 
avoids the traps that re-importing the script can cause.

If you pass that Foo as a parameter to your functions, you can avoid 
having Foo being a global variable itself, in each module other than the 
first.

But, to the core of the matter, if there's any chance that the value 
might change in the lifetime of the running program, you should probably 
not be using them as globals at all.  This is where the Bar approach 
helps.  Attributes defined in that way are attributes of an instance of 
Bar, and thus there can be more than one such.  The Bar instance can 
frequently allow you to generalize a program which might otherwise be 
hemmed in by globals.  And instead of passing Foo to functions, you pass 
bar_instance





From djames.suhanko at gmail.com  Fri May 29 09:11:24 2009
From: djames.suhanko at gmail.com (Djames Suhanko)
Date: Fri, 29 May 2009 10:11:24 -0300
Subject: pygame error: file is not a windows bmp file
Message-ID: <fd9e6bba0905290611h292dc830x902220a0d6da789@mail.gmail.com>

Hello, all!
"pygame error: file is not a windows bmp file"

 I couldn't found a solution for this problem.
My python script run fine in local machine using cxfreeze, but don't
work when copied to my live linux system.
If I put bmp image, works fine, but png don't.
Can you help me?
(and sorry my terrible english).

-- 
Djames Suhanko
LinuxUser 158.760


From durumdara at gmail.com  Fri May 29 09:19:39 2009
From: durumdara at gmail.com (Durumdara)
Date: Fri, 29 May 2009 15:19:39 +0200
Subject: Deletion/record visibility error in PG with Python...
In-Reply-To: <9e384ef60905280929t1a8bff86le33ff5f46a0abb05@mail.gmail.com>
References: <9e384ef60905280929t1a8bff86le33ff5f46a0abb05@mail.gmail.com>
Message-ID: <9e384ef60905290619g90b3a68ke9c0d1bb62cfcd8c@mail.gmail.com>

Hi!

Sorry for rtfm mail... I forgot to remove max_usage param in my real
application...

This parameter is limiting the number of cursor usage, and if max reached,
the DBUtils is automatically open a new cursor in the background! This is
break out of the actual transaction context...

Uhhhhh.... I wasted 2 hours to found the bug in another source... :-(

dd

2009/5/28 Durumdara <durumdara at gmail.com>

> Hi!
>
> PGSQL makes me crazy...
>
> I port my apps to PGSQL, and I near to finish - but I got this problem...
>
> Params: PGSQL 8.3, Windows, Pylons, PGDB, DBUTILS...
>
>
> What happened? How I can avoid the cursor changing? How to fix it in my
> transaction?
> I never ask for new cursor, I used same variable in all of my context
> (self.Cur)... :-(
>
> So what is the solution? Drop DBUtils? Or what?
>
> Thanks for your help:
>     dd
>
>
>
>
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From python.list at tim.thechases.com  Fri May 29 09:22:44 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 29 May 2009 08:22:44 -0500
Subject: formating query with empty parameter
In-Reply-To: <gvolau$hvn$1@panix3.panix.com>
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>	<eae607c4-d181-406d-b5ca-7c8c434af683@r37g2000yqd.googlegroups.com>	<c0e2bde9-968e-49cd-b6ff-f967ef57d2c0@37g2000yqp.googlegroups.com>	<mailman.717.1243258005.8015.python-list@python.org>
	<gvolau$hvn$1@panix3.panix.com>
Message-ID: <4A1FE1A4.2080603@tim.thechases.com>

Aahz wrote:
> Tim Chase  <python.list at tim.thechases.com> wrote:
>> To stave off this problem, I often use:
>>
>>   values = [
>>    data['a'],
>>    data['b'],
>>    data['c'],
>>    data['d'],
>>    data['e'],
>>    data['f'],
>>    data['g'],
>>    ]
>>   params = ', '.join('%s' for _ in values)
>>   query = """
>>     BEGIN;
>>       INSERT INTO table
>>         (a,b,c,d,e,f,g)
>>       VALUES (%s);
>>     COMMIT;
>>     """ % params
>>   self.db.execute(query, values)
> 
> How do you handle correct SQL escaping?

If you dump "query", you see that "params" (possibly a better 
name would be "place_holders") is merely a list of "%s, %s, %s, 
..., %s" allowing the "execute(query, ***values***)" to properly 
escape the values.  The aim is to ensure that 
"count(placeholders) == len(values)" which the OP mentioned was 
the problem.

My second round of code (in my initial post) ensures that

the number of items in the column definition (in this case the 
"a,b,c,d,e,f,g")
is the same as
the number of placeholders
is the same as the number of values.

The column-names should be code-controlled, and thus I don't 
worry about sql escaping them (my own dumb fault here), whereas 
the values may come from an untrusted source and need to be 
escaped.  So the code I use often has a dictionary of

  mapping = {
    "tablefield1": uservalue1,
    "tablefield2": uservalue2,
    ...
    }

which I can then easily add/remove columns in a single place if I 
need, rather than remembering to adjust the query in two places 
(the table-fieldnames and add the extra placeholder) AND the 
building of the "values" parameter.  It also makes it harder to 
mis-sequence them, accidentally making the table-fieldnames 
"a,b,c" and the values list "a,c,b" (which, when I have 20 or so 
fields being updated has happened to me on more than one occasion)

-tkc






From davea at ieee.org  Fri May 29 09:24:27 2009
From: davea at ieee.org (Dave Angel)
Date: Fri, 29 May 2009 09:24:27 -0400
Subject: PYTHONPATH var
In-Reply-To: <fd06ce4c0905290344k2d03dcc0t580b2022526c04e2@mail.gmail.com>
References: <fd06ce4c0905290344k2d03dcc0t580b2022526c04e2@mail.gmail.com>
Message-ID: <4A1FE20B.5010001@ieee.org>

Sergey Dikovitsky wrote:
> Hi guys. I have a question regarding runtime definition of the variable
> PYTHONPATH. Do you know how without modifying of source code change the
> value for this var. Value stores in the system var sys.path, but the first
> item of this list, path[0], is the directory containing the script that was
> used to invoke the Python interpreter. We need to change this value which
> allows to us import scripts first from directory containing newest hotfix
> scripts without replacing original project scripts. One of the variant is to
> create script which will modify this var and insert line with import this
> script into each project script. So the question does another way exist? For
> example, parameter or argument for python launcher.
>
>   
I have to guess much of what you're talking about.  So if this is way 
off, try responding with a clearer wording.

PYTHONPATH is an environment variable.  You change that using your 
operating system's scripting language (shell script).

But you're talking about changing the first entry in sys.path, a Python 
list, which is generated from PYTHONPATH and a few other sources.  So it 
must be changed as Python is starting, not in the shell.

It is an ordinary list, and may be changed in the usual way.  So a 
script could start with:
   import sys
   sys.path = ["newpath"] + sys.path

(although you'd probably want to use a variable, not a literal)

But you say "without modifying of source code."  Not clear what that 
means, without you qualifying just which source code is sacrosanct.

It seems you're trying to change the search order for the initial 
script.  But there is no search order.  You give an actual filename to 
the interpreter, and it does not search at all.  So perhaps what you 
really want is to modify the PATH variable before running the script.  
Then the operating system will search for it before trying to execute 
it.  This should work as long as you don't need any other switches on 
the python.exe command line.

You need to specify your system environment (Windows, Linux, ...), and 
probably your Python version.  And make it clearer what your real goal is.



From javier.collado at gmail.com  Fri May 29 09:30:11 2009
From: javier.collado at gmail.com (Javier Collado)
Date: Fri, 29 May 2009 15:30:11 +0200
Subject: Global variables from a class
In-Reply-To: <003bb2cb$0$9673$c3e8da3@news.astraweb.com>
References: <dded6fa9-00d9-4c4c-a090-b2bc6cc7b3f3@k8g2000yqn.googlegroups.com>
	<mailman.883.1243594929.8015.python-list@python.org>
	<003bb2cb$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <c83cde5a0905290630o2babedcfo61c6424f90ee0151@mail.gmail.com>

You're right. I agree on that it's important to use proper words.
Thanks for the correction.

Best regards,
    Javier

2009/5/29 Steven D'Aprano <steve at remove-this-cybersource.com.au>:
> On Fri, 29 May 2009 12:04:53 +0200, Javier Collado wrote:
>
>> Hello,
>>
>> First thing is a class variable (one for every instance) and second one
>> an instance variable (one per instance).
>
> One of these things don't belong:
>
> A string variable is a variable holding a string.
> A float variable is a variable holding a float.
> An int variable is a variable holding an int.
> A list variable is a variable holding a list.
> A "class variable" is an attribute of a class object, holding an
> ?object of arbitrary type, which is shared by all instances
> ?of the class.
>
> Please don't use the term "class variable" to mean class attribute.
>
>
>
> --
> Steven
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From james at agentultra.com  Fri May 29 10:09:12 2009
From: james at agentultra.com (J Kenneth King)
Date: Fri, 29 May 2009 10:09:12 -0400
Subject: what I would like python.el to do (and maybe it does)
References: <mailman.714.1243247520.8015.python-list@python.org>
	<85ljolfgaa.fsf@agentultra.com> <m2prdt2cr0.fsf@cs.uu.nl>
Message-ID: <87prdsxapj.fsf@agentultra.com>

Piet van Oostrum <piet at cs.uu.nl> writes:

>>>>>> J Kenneth King <james at agentultra.com> (JKK) wrote:
>
>>JKK> I find that it does work, but unlike SLIME for lisp, it just imports the statement.
>
>>JKK> It confused me at first, but basically the interpreter doesn't provide
>>JKK> any feedback to emacs.
>
>>JKK> Try opening a python source file (start python-mode if you don't have
>>JKK> an autoload hook) and do C-c C-z to bring up the Python
>>JKK> interpreter. Type in a simple assignment statement (like "a = 1 + 2"
>>JKK> without the quotes) into the source file. Then just C-c C-c as
>>JKK> usual. I never get any feedback. Just C-x o to the interpreter and
>>JKK> print out the variable you just defined. It should be there.
>
> What kind of feedback do you expect?

Well, that's the thing -- type a statement into a python interpreter and
you just get a new prompt.

LISP has a REPL, so you get some sort of feedback printed.

However, some sort of visual cue on the emacs side would be nice. Either
just flash the block of code being sent or a minibuffer message would be
nice.

Look for some SLIME tutorial videos on youtube to see some great
interpreter <-> editor interaction.

The stock Python interpreter probably wouldn't cut it close to something
like SLIME in terms of features, but the iPython package might be a
start.


From michele.petrazzo at REMOVE_me_unipex.it  Fri May 29 10:21:03 2009
From: michele.petrazzo at REMOVE_me_unipex.it (Michele Petrazzo)
Date: Fri, 29 May 2009 16:21:03 +0200
Subject: try except inside exec
Message-ID: <gvor0g$679$1@nnrp-beta.newsland.it>

Hi all,
I want to execute a python code inside a string and so I use the exec
statement. The strange thing is that the try/except couple don't catch
the exception and so it return to the main code.
Is there a solution to convert or make this code work?

Thanks,
Michele

My code:

STR = """
err = 0
try:
   def a_funct():
     1/0
except:
   import traceback
   err = traceback.format_exc()
"""

env = {}
exec STR in env
env["a_funct"]()
print env["err"]


My error:
   File "tmp/test_exec.py", line 14, in <module>
     env["a_funct"]()
   File "<string>", line 5, in a_funct
ZeroDivisionError: integer division or modulo by zero


From jeff at jmcneil.net  Fri May 29 10:30:07 2009
From: jeff at jmcneil.net (Jeff McNeil)
Date: Fri, 29 May 2009 07:30:07 -0700 (PDT)
Subject: how to change response code in CGIHTTPServer.py
References: <2c86f050-8a1b-4124-9cc8-f6666d1bd7dc@s28g2000vbp.googlegroups.com>
Message-ID: <cf5b238d-7ce1-4033-990b-1911b119390d@o20g2000vbh.googlegroups.com>

On May 28, 2:23?pm, Daniel <daniel.watr... at gmail.com> wrote:
> Hello,
>
> Python 2.5.2
> WinXP
>
> I'm using CGIHTTPServer.py and want to return a response code of 400
> with a message in the event that the cgi script fails for some
> reason. ?I notice that
> run_cgi(self):
> executes this line of code,
> self.send_response(200, "Script output follows")
> which overwrites any headers that I print in my cgi. ?Is there some
> way to modify the response code without having to override
> CGIHTTPServer.py?
>
> Thanks,

>>> help (CGIHTTPServer)
...
Note that status code 200 is sent prior to execution of a CGI script,
so
scripts cannot send other status codes such as 302 (redirect).
...
>>>

It sets that header before it even fires off the CGI script and just
pipes the following response to the client.


From castironpi at gmail.com  Fri May 29 10:38:46 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 29 May 2009 07:38:46 -0700 (PDT)
Subject: try except inside exec
References: <gvor0g$679$1@nnrp-beta.newsland.it>
Message-ID: <0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>

On May 29, 8:21?am, Michele Petrazzo
<michele.petrazzo at REMOVE_me_unipex.it> wrote:
> Hi all,
> I want to execute a python code inside a string and so I use the exec
> statement. The strange thing is that the try/except couple don't catch
> the exception and so it return to the main code.
> Is there a solution to convert or make this code work?
>
> Thanks,
> Michele
>
> My code:
>
> STR = """
> err = 0
> try:
> ? ?def a_funct():
> ? ? ?1/0
> except:
> ? ?import traceback
> ? ?err = traceback.format_exc()
> """
>
> env = {}
> exec STR in env
> env["a_funct"]()
> print env["err"]
>
> My error:
> ? ?File "tmp/test_exec.py", line 14, in <module>
> ? ? ?env["a_funct"]()
> ? ?File "<string>", line 5, in a_funct
> ZeroDivisionError: integer division or modulo by zero

The code you posted defines a function, and if the definition of it
raises an exception, it will enter your except clause.  By the way,
you generally should avoid 'bare' except clauses, and specify the type
of error you want to catch, in this case, 'ZeroDivisionError', as you
see (just good practice stuff).

It's not clear from your attempt what your exact goal was.  You
probably mean:

STR = """
class Globals:
   err = 0
def a_funct():
   try:
      1/0
   except ZeroDivisionError:
      import traceback
      Globals.err = traceback.format_exc()
"""

Note that the formatted exception will be available in 'env
["Globals"].err'.  But you could also mean:

exec STR in env
try:
  env["a_funct"]()
except ZeroDivisionError:
  import traceback
  err = traceback.format_exc()

Then the formatted exception will be available in 'err'.  Do you want
the exception-handling to be part of the function you are entering
into 'env'?


From pbewig at gmail.com  Fri May 29 10:41:03 2009
From: pbewig at gmail.com (Phil Bewig)
Date: Fri, 29 May 2009 07:41:03 -0700 (PDT)
Subject: Programming Praxis
Message-ID: <ad58300c-30ee-4bce-8006-f1cd7599993f@r13g2000vbr.googlegroups.com>

Please visit my blog, <a
href="programmingpraxis.wordpress.com">Programming Praxis</a>, which
presents a collection of programming etudes.  Newbies will find
exercises that extend their programming abilities.  Savvy programmers
can use the exercises to sharpen their skills or learn a new
language.  Brave programmers can submit their code to the review of
their colleagues.

<a href="programmingpraxis.wordpress.com">Programming Praxis</a> isn't
a contest.  No points are awarded, no scores are kept.  The exercises
simply provide an opportunity to hone your skills; the effort is its
own reward.

Come join us!


From aahz at pythoncraft.com  Fri May 29 11:22:02 2009
From: aahz at pythoncraft.com (Aahz)
Date: 29 May 2009 08:22:02 -0700
Subject: Network programming ?
References: <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6@z5g2000vba.googlegroups.com>
Message-ID: <gvouiq$fes$1@panix3.panix.com>

In article <ce229a0d-4ebe-4e42-8638-4b1ee1dbd8e6 at z5g2000vba.googlegroups.com>,
 <thushianthan15 at gmail.com> wrote:
>
>I am planning to develop a chatting software in Python, for my college
>project. I am using Windows Vista. Is it possible to do sockets
>programming in Python ? Any books or websites ?  Also, i want to
>develop a gui for that program. What are the gui tool kits available
>for windows? I already knew about PyGtk and PyQT, but will they work
>properly in Windows platform? Any suggestions?

You likely want to use Twisted, you should at least investigate it.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From gherron at islandtraining.com  Fri May 29 11:22:12 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Fri, 29 May 2009 08:22:12 -0700
Subject: extract to dictionaries
In-Reply-To: <52298ae10905290344s8d6ef34ma6f16aa2f51be9e5@mail.gmail.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>	
	<4A1F27B1.7040005@islandtraining.com>
	<52298ae10905290344s8d6ef34ma6f16aa2f51be9e5@mail.gmail.com>
Message-ID: <4A1FFDA4.10304@islandtraining.com>

Marius Retegan wrote:
> Hi,
>
> On Fri, May 29, 2009 at 2:09 AM, Gary Herron 
> <gherron at islandtraining.com <mailto:gherron at islandtraining.com>> wrote:
>
>     Marius Retegan wrote:
>
>         Hello
>         I have simple text file that I have to parse. It looks
>         something like
>         this:
>
>         parameters1
>             key1 value1
>             key2 value2
>         end
>
>         parameters2
>             key1 value1
>             key2 value2
>         end
>
>         So I want to create two dictionaries parameters1={key1:value1,
>         key2:value2} and the same for parameters2.
>
>         I would appreciate any help that could help me solve this.
>         Thank you
>          
>
>
>     This looks like a homework problem. 
>
>
> It's not. I'm passed homework age.
>  
>
>       But even if it's not, you are not likely to find someone who is
>     willing to put more work into this problem than you have.
>     So  why don't you show us what you've tried, and see if someone is
>     willing to make suggestions or answer specific question about your
>     attempt at a solution?
>
>
> I don't now if posting a code that gets into a while loop and never 
> stops would demonstrate to you that I've tried. Be assured that before 
> posting to the list I did try to solve it myself, because I knew that 
> I might get an answer like RTFM or similar.
> Maybe I'm not smart enough, but I can't make python to start reading 
> after the "parameter1" line and stop at the "end" line. That's all I 
> want a small piece of pseudocode to do just that.

OK.  Assuming you are open a file with something like:
f = open('data', 'r')

Then this will read lines up to the first "parameters" line
for line in f:
    if line.startswith('parameters'):
       break

At this point, line contains 'parameters1\n'.  Do with it as you will.

Then read and process lines until an end line is reached
for line in f:
    if line.beginswith('end'):
        break
    # Here line contains  '    key1 value1\n'.
    # Perhaps use line.strip to remove the white space on each end
    # and k,v =line.split() to split out the two values on the line.

You'll need more:
  A loop to keep the above two going until the end of file
  A way to recognize the end of the file.

Gary Herron

>
> Thanks
>  
>
>
>     Gary Herron
>
>



From aahz at pythoncraft.com  Fri May 29 11:23:00 2009
From: aahz at pythoncraft.com (Aahz)
Date: 29 May 2009 08:23:00 -0700
Subject: formating query with empty parameter
References: <b1b6f96d-ccd0-42ca-a0c8-3c797e2a639d@3g2000yqk.googlegroups.com>
	<mailman.717.1243258005.8015.python-list@python.org>
	<gvolau$hvn$1@panix3.panix.com>
	<mailman.892.1243603377.8015.python-list@python.org>
Message-ID: <gvoukk$eap$1@panix3.panix.com>

In article <mailman.892.1243603377.8015.python-list at python.org>,
Tim Chase  <python.list at tim.thechases.com> wrote:
>Aahz wrote:
>> Tim Chase  <python.list at tim.thechases.com> wrote:
>>> To stave off this problem, I often use:
>>>
>>>   values = [
>>>    data['a'],
>>>    data['b'],
>>>    data['c'],
>>>    data['d'],
>>>    data['e'],
>>>    data['f'],
>>>    data['g'],
>>>    ]
>>>   params = ', '.join('%s' for _ in values)
>>>   query = """
>>>     BEGIN;
>>>       INSERT INTO table
>>>         (a,b,c,d,e,f,g)
>>>       VALUES (%s);
>>>     COMMIT;
>>>     """ % params
>>>   self.db.execute(query, values)
>> 
>> How do you handle correct SQL escaping?
>
>If you dump "query", you see that "params" (possibly a better 
>name would be "place_holders") is merely a list of "%s, %s, %s, 
>..., %s" allowing the "execute(query, ***values***)" to properly 
>escape the values.  The aim is to ensure that 
>"count(placeholders) == len(values)" which the OP mentioned was 
>the problem.

Right, that's what I get for reading code early in the morning.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From emile at fenx.com  Fri May 29 11:49:57 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 29 May 2009 08:49:57 -0700
Subject: extract to dictionaries
In-Reply-To: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
Message-ID: <gvp0b6$k9g$1@ger.gmane.org>

On 5/28/2009 4:03 PM Marius Retegan said...
> Hello
> I have simple text file that I have to parse. It looks something like
> this:
> 
> parameters1
>      key1 value1
>      key2 value2
> end
> 
> parameters2
>      key1 value1
>      key2 value2
> end
> 
> So I want to create two dictionaries parameters1={key1:value1,
> key2:value2} and the same for parameters2.
> 
> I woud appreciate any help that could help me solve this.
> Thank you
> 

Assuming you've read the above into paramFile...

for dictvals in [xx.split() for xx in paramFile.split("end") if xx]:
     locals()[dictvals[0]]=dict(zip(dictvals[1::2],dictvals[2::2]))

You-can't-really-call-this-helping-ly yrs,

Emile



From michele.petrazzo at REMOVE_me_unipex.it  Fri May 29 11:55:01 2009
From: michele.petrazzo at REMOVE_me_unipex.it (Michele Petrazzo)
Date: Fri, 29 May 2009 17:55:01 +0200
Subject: try except inside exec
In-Reply-To: <0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>
References: <gvor0g$679$1@nnrp-beta.newsland.it>
	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>
Message-ID: <gvp0gn$9qh$1@nnrp-beta.newsland.it>

Aaron Brady wrote:
> STR = """
> class Globals:
>    err = 0
> def a_funct():
>    try:
>       1/0
>    except ZeroDivisionError:
>       import traceback
>       Globals.err = traceback.format_exc()
> """


> exec STR in env
> try:
>   env["a_funct"]()
> except ZeroDivisionError:
>   import traceback
>   err = traceback.format_exc()
> 
> Then the formatted exception will be available in 'err'.  Do you want
> the exception-handling to be part of the function you are entering
> into 'env'?

My goal is to execute a function received from a third-part, so I cannot 
modify as you made in your first piece of code.
I want a "clean" exception with the real line code/tb so I can show a 
"real" error message. This means that the try/execpt has to include the 
passed function and catch every possible exception.

Do you have any ideas on how can I figure this out?

Thanks,
Michele


From cfbolz at gmx.de  Fri May 29 12:07:28 2009
From: cfbolz at gmx.de (Carl Friedrich Bolz)
Date: Fri, 29 May 2009 18:07:28 +0200
Subject: PyPy Europython Sprint Announcement
Message-ID: <gvp180$n1c$1@ger.gmane.org>

==================================================================
Birmingham (UK) EuroPython PyPy Sprints 28-29 June/ 3-4 July 2009
==================================================================

The PyPy team is sprinting at EuroPython again. This year there are
`sprint days`_ before (28-29 June) and after (3-4 July) the conference.
Some PyPy core people should be present during both periods.

.. _`sprint days`: http://wiki.europython.eu/Sprints

If you plan to attend the sprints after the conference we recommend you
to listen to the PyPy technical talk (`EuroPython schedule`_) during the
conference since it will give you a good overview of the status of
development.

Goals and topics of the sprint
------------------------------

There are many possible and interesting sprint topics to work on - here
we list some possible task areas:

  - trying out software on PyPy's Python interpreter: the CPython test
    suite is not all that complete, therefore the fact that we pass most
    tests is no real indication of bug-freeness. We have tried and know
    that frameworks like Django and Twisted work with PyPy. Therefore we
    would like to try running more "real applications" on top of the
    Python interpreter (ideally ones that have a good test suite
    themselves and that don't need unusual extension modules). Running
    things on Windows is also interesting, we know our coverage there is
    not as good as on Linux.

  - check and improve Mac OS X support

  - starting to work on porting 2.6 features to PyPy's Python interpreter

  - ongoing JIT generator work

  - of course we are open to other ideas for what to work on. Examples
    could be working on other language interpreters, sandboxing, ...


------------
Registration
------------

If you'd like to come, please subscribe to the `pypy-sprint mailing
list`_ and drop a note about your interests and post any questions.
More organisational information will be sent to that list.

Please register by adding yourself on the following list (via svn):

   http://codespeak.net/svn/pypy/extradoc/sprintinfo/ep2009/people.txt

or on the pypy-sprint mailing list if you do not yet have check-in
rights:

   http://codespeak.net/mailman/listinfo/pypy-sprint

---------------------------------------
Preparation (if you feel it is needed):
---------------------------------------

- read the `getting-started`_ pages on http://codespeak.net/pypy,
   especially also the `development of PyPy itself part`_ .

- for inspiration, overview and technical status you are welcome to read
   `the technical reports available and other relevant documentation`_

- please direct any technical and/or development oriented questions to
   pypy-dev at codespeak.net and any sprint organizing/logistical
   questions to pypy-sprint at codespeak.net

- if you need information about the conference, potential hotels,
   directions etc we recommend to look at http://www.europython.eu.


We are looking forward to meet you at the EuroPython PyPy sprints!

The PyPy team


.. See also ..

.. _getting-started:
http://codespeak.net/pypy/dist/pypy/doc/getting-started.html
.. _`development of PyPy itself part`:
http://codespeak.net/pypy/dist/pypy/doc/getting-started-dev.html

.. _`pypy-sprint mailing list`:
http://codespeak.net/mailman/listinfo/pypy-sprint
.. _`the technical reports available and other relevant documentation`:
http://codespeak.net/pypy/dist/pypy/doc/docindex.html

.. _`EuroPython schedule`: http://europython.eu/talks/timetable





From ifl2009 at shu.edu  Fri May 29 12:23:59 2009
From: ifl2009 at shu.edu (IFL 2009)
Date: Fri, 29 May 2009 12:23:59 -0400
Subject: IFL 2009: Second Call for Papers
Message-ID: <OFE617316A.0B48F237-ON852575C5.0059868B-852575C5.005A16A2@shu.edu>

Call for Papers 
IFL 2009
Seton Hall University
SOUTH ORANGE, NJ, USA
http://tltc.shu.edu/blogs/projects/IFL2009/


** NEW **

Accomodations information available: 
http://tltc.shu.edu/blogs/projects/IFL2009/accommodations.html

Jane Street Capital has joined IFL 2009 as a sponsor

*********


The 21st International Symposium on Implementation and Application of 
Functional Languages, IFL 2009, will be held 
for the first time in the USA. The hosting institution is Seton Hall 
University in South Orange, NJ, USA and the 
symposium dates are September 23-25, 2009. It is our goal to make IFL a 
regular event held in the USA and in 
Europe. The goal of the IFL symposia is to bring together researchers 
actively engaged in the implementation and 
application of functional and function-based programming languages. IFL 
2009 will be a venue for researchers to 
present and discuss new ideas and concepts, work in progress, and 
publication-ripe results related to the 
implementation and application of functional languages and function-based 
programming.

Following the IFL tradition, IFL 2009 will use a post-symposium review 
process to produce a formal proceedings which 
will be published by Springer in the Lecture Notes in Computer Science 
series. All participants in IFL 2009 are 
invited to submit either a draft paper or an extended abstract describing 
work to be presented at the symposium. 
These submissions will be screened by the program committee chair to make 
sure they are within the scope of IFL and will 
appear in the draft proceedings distributed at the symposium. Submissions 
appearing in the draft proceedings are not 
peer-reviewed publications. After the symposium, authors will be given the 
opportunity to incorporate the feedback from 
discussions at the symposium and will be invited to submit a revised full 
arcticle for the formal review process. These 
revised submissions will be reviewed by the program committee using 
prevailing academic standards to select the best 
articles that will appear in the formal proceedings.


TOPICS

IFL welcomes submissions describing practical and theoretical work as well 
as submissions describing applications and tools. 
If you are not sure if your work is appropriate for IFL 2009, please 
contact the PC chair at ifl2009 at shu.edu. Topics of 
interest include, but are not limited to:

 language concepts 
 type checking 
 contracts
 compilation techniques 
 staged compilation
 runtime function specialization
 runtime code generation 
 partial evaluation 
 (abstract) interpretation 
 generic programming techniques 
 automatic program generation 
 array processing 
 concurrent/parallel programming 
 concurrent/parallel program execution 
 functional programming and embedded systems 
 functional programming and web applications 
 functional programming and security 
 novel memory management techniques 
 runtime profiling and performance measurements 
 debugging and tracing 
 virtual/abstract machine architectures 
 validation and verification of functional programs 
 tools and programming techniques 
 FP in Education


PAPER SUBMISSIONS

Prospective authors are encouraged to submit papers or extended abstracts 
to be published in the draft proceedings and to 
present them at the symposium. All contributions must be written in 
English, conform to the Springer-Verlag LNCS series 
format and not exceed 16 pages. The draft proceedings will appear as a 
technical report of the Department of Mathematics 
and Computer Science of Seton Hall University.


IMPORTANT DATES

Registration deadline                   August 15, 2009
Presentation submission deadline        August 15, 2009
IFL 2009 Symposium                      September 23-25, 2009
Submission for review process deadline  November 1, 2009
Notification Accept/Reject              December 22, 2009
Camera ready version                    February 1, 2010


PROGRAM COMMITTEE

Peter Achten                       University of Nijmegen, The Netherlands
Jost Berthold                       Philipps-Universit?t Marburg, Germany
Andrew Butterfield             University of Dublin, Ireland
Robby Findler                     Northwestern University, USA
Kathleen Fisher                   AT&T Research, USA
Cormac Flanagan              University of California at Santa Cruz, USA
Matthew Flatt                        University of Utah, USA
Matthew Fluet                       Toyota Technological Institute at 
Chicago, USA
Daniel Friedman                 Indiana University, USA
Andy Gill                                University of Kansas, USA
Clemens Grelck                  University of Amsterdam/Hertfordshire, The 
Netherlands/UK
Jurriaan Hage                      Utrecht University, The Netherlands
Ralf Hinze                              Oxford University, UK
Paul Hudak                           Yale University, USA
John Hughes                        Chalmers University of Technology, 
Sweden
Patricia Johann                    University of Strathclyde, UK
Yukiyoshi Kameyama        University of Tsukuba, Japan
Marco T. Moraz?n (Chair)  Seton Hall University, USA
Rex Page                                University of Oklahoma, USA
Fernando Rubio                    Universidad Complutense de Madrid, Spain
Sven-Bodo Scholz               University of Hertfordshire, UK
Manuel Serrano                     INRIA Sophia-Antipolis, France
Chung-chieh Shan                Rutgers University, USA
David Walker                         Princeton University, USA
Vikt?ria Zs?k                          E?tv?s Lor?nd University, Hungary


PETER LANDIN PRIZE

The Peter Landin Prize is awarded to the best paper presented at the 
symposium every year. The honored article is selected 
by the program committee based on the submissions received for the formal 
review process. The prize carries a cash award 
equivalent to 150 euros.
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From emile at fenx.com  Fri May 29 12:47:54 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 29 May 2009 09:47:54 -0700
Subject: try except inside exec
In-Reply-To: <gvp0gn$9qh$1@nnrp-beta.newsland.it>
References: <gvor0g$679$1@nnrp-beta.newsland.it>	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>
	<gvp0gn$9qh$1@nnrp-beta.newsland.it>
Message-ID: <gvp3ns$v9t$1@ger.gmane.org>

On 5/29/2009 8:55 AM Michele Petrazzo said...
> Aaron Brady wrote:
<snip>
>> Then the formatted exception will be available in 'err'.  Do you want
>> the exception-handling to be part of the function you are entering
>> into 'env'?
> 
> My goal is to execute a function received from a third-part, so I cannot 
> modify as you made in your first piece of code.
> I want a "clean" exception with the real line code/tb so I can show a 
> "real" error message. This means that the try/execpt has to include the 
> passed function and catch every possible exception.
> 
> Do you have any ideas on how can I figure this out?

Write the string out to a .py file and import it?

Emile



From python-url at phaseit.net  Fri May 29 12:52:15 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Fri, 29 May 2009 16:52:15 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (May 29)
Message-ID: <gvp3rv$l08$1@lairds.us>

QOTW:  "Death To Wildcard Imports" - Lawrence D'Oliveiro
    http://groups.google.com/group/comp.lang.python/msg/835cf7f35ed f4897
    
    
    How to ask questions having a chance of being answered:
        http://groups.google.com/group/comp.lang.python/t/17b15282d07770d1/
    
    Multiprocessing and memory usage:
        http://groups.google.com/group/comp.lang.python/t/4c9c5805aadd833d/
    
    Of backslashes and raw string literals:
        http://groups.google.com/group/comp.lang.python/t/dd18130f9f379974/
    
    How does OOP "feel" in Python?
        http://groups.google.com/group/comp.lang.python/t/2cf2e3c9c1df4e8b/
    
    Sockets: how to reuse the same port quickly
        http://groups.google.com/group/comp.lang.python/t/82204fb9d10d38aa/
    
    Tools to optmize math functions:
        http://groups.google.com/group/comp.lang.python/t/2b34fd6c43be79d6/
    
    Replacing module with a stub for unit testing:
        http://groups.google.com/group/comp.lang.python/t/023dff1ec533f101/
    
    Sometimes it's better to use delegation instead of inheritance:
        http://groups.google.com/group/comp.lang.python/t/86674e06fc14c6a6/
    
    Inserting NULL values in a database:
        http://groups.google.com/group/comp.lang.python/t/3c3ccdbfe1bc5a45/
    
    
========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiasts":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.
	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    Enjoy the *Python Magazine*.
	http://pymag.phparch.com/

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
  http://search.gmane.org/?query=python+URL+weekly+news+links&group=gmane.comp.python.general&sort=date
  http://groups.google.com/groups/search?q=Python-URL!+group%3Acomp.lang.python&start=0&scoring=d&
  http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes

There is *not* an RSS for "Python-URL!"--at least not yet.  Arguments
for and against are occasionally entertained.


Suggestions/corrections for next week's posting are always welcome.
E-mail to <Python-URL at phaseit.net> should get through.

To receive a new issue of this posting in e-mail each Monday morning
(approximately), ask <claird at phaseit.net> to subscribe.  Mention
"Python-URL!".  Write to the same address to unsubscribe.


-- The Python-URL! Team--

Phaseit, Inc. (http://phaseit.net) is pleased to participate in and
sponsor the "Python-URL!" project.  Watch this space for upcoming
news about posting archives.


From garrickp at gmail.com  Fri May 29 13:06:48 2009
From: garrickp at gmail.com (Falcolas)
Date: Fri, 29 May 2009 10:06:48 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <mailman.873.1243580240.8015.python-list@python.org> 
	<003b70c0$0$9673$c3e8da3@news.astraweb.com>
Message-ID: <329585b8-1761-4b41-9682-a1fe61c0af31@x3g2000yqa.googlegroups.com>

I am a long time VIM user, and I likely will not change that. The
speed, ease of use and functionality, for me, is worth the time spent
learning how to use it.

My secondary editor on the desktop is UltraEdit, which does a fine job
as a text editor and has all the same functionality of VIM - yet
despite 2 years on it (they won't allow me GVIM at work), I can't get
to the same level of productivity with it as I can with VIM.

Ditto Eclipse... I spent more time figuring out how to get a program
to run properly than coding. The limited autocomplete and function
jump-list were not worth the pain of getting it working, IMO.

On May 29, 2:01 am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:

> (1) Closed source editors have the same functional requirements as open
> source editors.
>
> (2) If you're waiting for perfection, you'll be waiting forever.
>
> (3) Why independent of the OS? When is the last time you've used a system
> without an OS? Forth programmers in the 1970s used an editor that was OS
> independent -- it managed files using its own unique file structure,
> managed memory itself, etc. Why do you want to go back there?

As to your points, Steven:

1) I would agree with this point. VI and it's children were written to
a different interpretation of said rules, however. They were built
around the speed at which a human can use a keyboard with natural
finger movements, at the expense of discoverability and intuitiveness.
2) VIM may not be perfect, but it's really darned close. ;-)
3) OS independence, IMO, is related more to the ability to use the
tool on every OS, rather than on the lack of an OS.


From dstanek at dstanek.com  Fri May 29 13:07:44 2009
From: dstanek at dstanek.com (David Stanek)
Date: Fri, 29 May 2009 13:07:44 -0400
Subject: try except inside exec
In-Reply-To: <gvp0gn$9qh$1@nnrp-beta.newsland.it>
References: <gvor0g$679$1@nnrp-beta.newsland.it>
	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>
	<gvp0gn$9qh$1@nnrp-beta.newsland.it>
Message-ID: <de32cc030905291007s6a8d64f8k16707c49bd1679e8@mail.gmail.com>

On Fri, May 29, 2009 at 11:55 AM, Michele Petrazzo
<michele.petrazzo at remove_me_unipex.it> wrote:
>
> My goal is to execute a function received from a third-part, so I cannot
> modify as you made in your first piece of code.
> I want a "clean" exception with the real line code/tb so I can show a "real"
> error message. This means that the try/execpt has to include the passed
> function and catch every possible exception.
>
> Do you have any ideas on how can I figure this out?
>

Is the thirdparty function the entire STR or just the a_funct part?

-- 
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek


From iainemsley at googlemail.com  Fri May 29 13:09:10 2009
From: iainemsley at googlemail.com (iainemsley)
Date: Fri, 29 May 2009 10:09:10 -0700 (PDT)
Subject: Trying to get cleaner XML output from a text file
Message-ID: <cf161cdb-a623-496a-af42-bb4d06ae74cb@s16g2000vbp.googlegroups.com>

I'm using Python2.5 to try and convert some text files into XML using
xml.minidom. I'm currently doing some plays which have a structure
like
Scene 1
Act 1
blah blah
Act2
blah blah
Scene 2
Act 1
and so on.
I'm trying to turn it into
<div type="scene">1
  <div type="act">1
   <speech />
  </div>
  <div type="act">2
   <speech />
  </div>
</div>
(or ideally <div type="scene" id="1"> bit I can always come back to
this later)
I've currently got:
 <div id="" type="scene">
  <div id=" " type="act">
   <speech>
    II
   </speech>
  </div>
 </div>
 <div id="" type="scene">
  <div id=" " type="act">
   <speech>
    II
   </speech>
  </div>
 </div>
 <div id="" type="scene">
  <div id=" " type="act">
The code I'm currently working with is:
from itertools import groupby
from xml.dom.minidom import Document

import re

text = open('\\texts\\midsummer_nights_dream_gut.txt').read()

def paragraphs(lines, is_separator=str.isspace, joiner=''.join):
    for separator_group, lineiter in groupby(lines, key=is_separator):
        if not separator_group:
            yield joiner(lineiter)

def scene_node(scene):
    global docText
    docText = doc.createElement("div")
    #need to set the type to book, verse, drama
    docText.setAttribute("type", "scene")
    #need set the id to what ever break name or id: i.e. chapter 1 or
act 1
    docText.setAttribute("id", '')
    tei.appendChild(docText)
    for acts in actTxt.split(scene):
        act_node(acts)

def act_node(act):
    global actText
    actText = doc.createElement("div")
    #need to set the type to book, verse, drama
    actText.setAttribute("type", "act")
    #need set the id to what ever id: 1 or I
    actText.setAttribute("id", ' ')
    docText.appendChild(actText)
    for p in paragraphs(act.splitlines(True)):
        speech_node(p)

def speech_node(speech):
        para = doc.createElement("speech")
        actText.appendChild(para)
        ptext = doc.createTextNode(speech)
        para.appendChild(ptext)


doc = Document()
tei = doc.createElement("body")
doc.appendChild(tei)

sideTxt = re.compile(r"Scene\s+([1-9])", re.I)
actTxt = re.compile(r"Act\s+([1-9])", re.I)
for textStr in sideTxt.split(text):
    scene_node(textStr)

print doc.toprettyxml(indent = " ")
I'd be grateful for some pointers about getting a cleaner output.

Thanks,

Iain


From piet at cs.uu.nl  Fri May 29 13:44:12 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Fri, 29 May 2009 19:44:12 +0200
Subject: Parsing DTDs
References: <alpine.DEB.1.10.0905291352130.14054@urchin.earth.li>
Message-ID: <m2eiu7g5xv.fsf@cs.uu.nl>

>>>>> Tom Anderson <twic at urchin.earth.li> (TA) wrote:

>TA> Hello!
>TA> I would like to parse XML DTDs. The goal is to be able to validate XML-like
>TA> object structures against DTDs in a fairly flexible way, although i can get
>TA> from a parsed DTD to a validation engine myself, so that's not an essential
>TA> feature of the parser (although it would be nice!). What should i do?

>TA> A bit of googling revealed that the xmlproc package contains a DTD parser
>TA> that looks like it does just what i want, and that xmlproc became PyXML,
>TA> and that PyXML is no longer maintained.

>TA> Is there a DTD parser that is being maintained? Or does it not really
>TA> matter that PyXML is no longer maintained, given that it's not like the DTD
>TA> spec has changed very much?

http://codespeak.net/lxml/validation.html#dtd
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From castironpi at gmail.com  Fri May 29 14:25:13 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 29 May 2009 11:25:13 -0700 (PDT)
Subject: try except inside exec
References: <gvor0g$679$1@nnrp-beta.newsland.it>
	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>
	<gvp0gn$9qh$1@nnrp-beta.newsland.it>
Message-ID: <f8fa5a89-9b49-4e1f-a4e4-c369ba6c71ae@s31g2000vbp.googlegroups.com>

On May 29, 9:55?am, Michele Petrazzo
<michele.petrazzo at REMOVE_me_unipex.it> wrote:
> Aaron Brady wrote:
> > STR = """
> > class Globals:
> > ? ?err = 0
> > def a_funct():
> > ? ?try:
> > ? ? ? 1/0
> > ? ?except ZeroDivisionError:
> > ? ? ? import traceback
> > ? ? ? Globals.err = traceback.format_exc()
> > """
> > exec STR in env
> > try:
> > ? env["a_funct"]()
> > except ZeroDivisionError:
> > ? import traceback
> > ? err = traceback.format_exc()
>
> > Then the formatted exception will be available in 'err'. ?Do you want
> > the exception-handling to be part of the function you are entering
> > into 'env'?
>
> My goal is to execute a function received from a third-part, so I cannot
> modify as you made in your first piece of code.
> I want a "clean" exception with the real line code/tb so I can show a
> "real" error message. This means that the try/execpt has to include the
> passed function and catch every possible exception.
>
> Do you have any ideas on how can I figure this out?
>
> Thanks,
> Michele

Exceptions are only caught when raised in a 'try' statement.  If you
don't raise the exception in a try statement, it won't be caught.

The function you posted will raise an exception.  If you are making
the call yourself, that is, if only the definition is foreign, then
simply catch exceptions when so.

Otherwise, my only idea so far is to use the 'ast' module to inject an
exception handler into the third-party function.  That is quite
advanced and may be error-prone, though I think it would look
something like this:

for every 'def' statement in STR:
   def_statement.body= try_statement + def_statement.body

I expect it would be more reliable than hand-parsing the text and
concatenating a string exception statement.

Any interest in this, or do you make the call yourself?


From Jared.S.Bauer at gmail.com  Fri May 29 14:26:07 2009
From: Jared.S.Bauer at gmail.com (Jared.S.Bauer at gmail.com)
Date: Fri, 29 May 2009 11:26:07 -0700 (PDT)
Subject: Questions about regex
Message-ID: <fe9f707f-aaf3-4ca6-859a-5b0c63904fc0@s28g2000vbp.googlegroups.com>

Hello,

I'm new to python and I'm having problems with a regular expression. I
use textmate as my editor and when I run the regex in textmate it
works fine, but when I run it as part of the script it freezes. Could
anyone help me figure out why this is happening and how to fix it.
Here is the script:


======================================================
# regular expression search and replace
import sys, os, re, string, csv

#Open the file and taking its data
myfile=open('Steve_query3.csv') #Steve_query_test.csv
#create an error flag  to loop the script twice
#store all file's data in the string object 'text'
myfile.seek(0)
text = myfile.read()

for i in range(2):
	#def textParse(text, reRun):
	print 'how many times is this getting executed', i

	#Now to create the newfile 'test' and write our 'text'
	newfile = open('Steve_query3_out.csv', 'w')
	#open the new file and set it with 'w' for "write"
	#loop trough 'text' clean them up and write them into the 'newfile'
			#sub(  	pattern, repl, string[, count])
			#"sub("(?i)b+", "x", "bbbb BBBB")" returns 'x x'.
	text = re.sub('(\<(/?[^\>]+)\>)', "", text)#remove the HTML
	text = re.sub('/<!--(.|\s)*?-->/', "", text) #remove comments  <!--[^
\-]+-->
	text = re.sub('\/\*(.|\s)*?;}', "", text) #remove css formatting
	#remove a bunch of word formatting yuck
	text = re.sub("&nbsp;", " ", text)
	text = re.sub("&lt;", "<", text)
	text = re.sub("&gt;", ">", text)
	text = re.sub("&quot;|&rquot;|&ldquo;", "\'", text)
#===================================
#The two following lines are the ones giving me the problems
	text = re.sub("w:(.|\s)*?\n", "", text)
	text = re.sub("UnhideWhenUsed=(.|\s)*?\n", "", text)
#===========================================
	text = re.sub(re.compile('^\r?\n?$', re.MULTILINE), '', text) #remove
the extra whitespace
	#now write out the new file and close it
	newfile.write(text)
	newfile.close()

	#open the newfile and run the script again
	#Open the file and taking its data

	myfile=open('Steve_query3_out.csv') #Steve_query_test.csv
	#store all file's data in the string object 'text'
	myfile.seek(0)
	text = myfile.read()

Thanks for the help,

-Jared


From tjreedy at udel.edu  Fri May 29 14:29:46 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 29 May 2009 14:29:46 -0400
Subject: python list pattern matching?
In-Reply-To: <gvnvme$p5f$00$2@news.t-online.com>
References: <d2eb72fb-5ff7-414b-851d-d5703f5de8d7@37g2000yqp.googlegroups.com>	<mailman.859.1243551475.8015.python-list@python.org>
	<gvnvme$p5f$00$2@news.t-online.com>
Message-ID: <gvp9ip$gb9$1@ger.gmane.org>

Peter Otten wrote:
> Terry Reedy wrote:
> 
>>  >>> a,b,*rest = list(range(10))
> 
> The list() call is superfluous.

Agreed, even in Py3 when range() returns a range object rather than a list.



From namekuseijin at gmail.com  Fri May 29 14:32:15 2009
From: namekuseijin at gmail.com (namekuseijin)
Date: Fri, 29 May 2009 15:32:15 -0300
Subject: Programming Praxis
In-Reply-To: <c1bcecd0-6dab-4fef-aad2-5f1b88708034@z19g2000vbz.googlegroups.com>
References: <c1bcecd0-6dab-4fef-aad2-5f1b88708034@z19g2000vbz.googlegroups.com>
Message-ID: <gvp9nf$2h2u$2@adenine.netfront.net>

Phil Bewig escreveu:
> Please visit my blog, Programming Praxis, which presents a collection
> of programming etudes.  Newbies will find exercises that extend their
> programming abilities.  Savvy programmers can use the exercises to
> sharpen their skills or learn a new language.  Brave programmers can
> submit their code to the review of their colleagues.
> 
> Programming Praxis isn't a contest.  No points are awarded, no scores
> are kept.  The exercises simply provide an opportunity to hone your
> skills; the effort is its own reward.
> 
> Programming Praxis is available on the web at http://programmingpraxis.wordpress.com.
> Come join us!

It's very good, yes. :)

-- 
a game sig: http://tinyurl.com/d3rxz9


From chrisv at nospam.invalid  Fri May 29 15:11:17 2009
From: chrisv at nospam.invalid (chrisv)
Date: Fri, 29 May 2009 14:11:17 -0500
Subject: DrPython (Windows) problems
Message-ID: <5ob025pmkjfk1pdfbhh2fsaeekceof32hk@4ax.com>


Running DrPython under Linux works great.  However, when I run it
under Windows:

1)  I need to "Open" programs twice.  That's right, File, Open, and
select the program.  First time, nothing.  Repeat, and there's the
program!

2)  Run I run a program, the "execution box" comes-up and shows the
program output, but it never goes-away.  I cannot figure-out how to
close this window.



From cameron.pulsford at gmail.com  Fri May 29 15:13:46 2009
From: cameron.pulsford at gmail.com (Cameron Pulsford)
Date: Fri, 29 May 2009 15:13:46 -0400
Subject: NameError function not found
Message-ID: <5700df6b0905291213y4ee08697xb336797adeb468a2@mail.gmail.com>

Hey everyone, I am extremely stumped on this. I have 2 functions..

def _determinant(m):
   return m[0][0] * m[1][1] - m[1][0] * m[0][1]

def cofactor(self):
   """Returns the cofactor of a matrix."""
   newmatrix = []
   for i, minor in enumerate(self.minors()):
       newmatrix.append(_determinant(minor.matrix) * ((i%2) * -1))
   return newmatrix

And I get the following error when I try to run a.cofactor()...

"NameError: global name '_determinant' is not defined"

When I put the _determinant function nested within the cofactor function it
works fine. Normally I would do this, but a lot of other methods use the
_determinant method. They are both in the same class, and they are at the
same level, they are even in that order so I know it should be  able to see
it. I have a lot of functions that call other functions in this class and
everything is fine. [Also for the picky, I know my cofactor method isn't
mathematically correct yet ;-) ] Am I missing something obvious here? Also
if it helps the rest of the code is here
http://github.com/dlocpuwons/pymath/blob/d1997329e4473f8f6b5c7f11635dbd719d4a14fa/matrix.py
though
it is not the latest.
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From roastie57 at gmail.com  Fri May 29 15:14:37 2009
From: roastie57 at gmail.com (Roastie)
Date: Fri, 29 May 2009 12:14:37 -0700 (PDT)
Subject: PyOpenGL Installation
Message-ID: <d76a72b7-3196-4fef-86b7-473c827dcfba@s16g2000vbp.googlegroups.com>

The web info I have found for downloading/installing PyOpenGL and
its dependencies for Windows is a nightmare.  Is there a place where
all of
the endless dependencies are packaged nicely with PyOpenGL?


From tack at urandom.ca  Fri May 29 16:07:12 2009
From: tack at urandom.ca (Jason Tackaberry)
Date: Fri, 29 May 2009 16:07:12 -0400
Subject: NameError function not found
In-Reply-To: <5700df6b0905291213y4ee08697xb336797adeb468a2@mail.gmail.com>
References: <5700df6b0905291213y4ee08697xb336797adeb468a2@mail.gmail.com>
Message-ID: <1243627632.3568.346.camel@arrakis>

On Fri, 2009-05-29 at 15:13 -0400, Cameron Pulsford wrote:
> def _determinant(m):
>    return m[0][0] * m[1][1] - m[1][0] * m[0][1]

Given that this has no self argument, I'm assuming this is not a class
method.


> def cofactor(self):
>    """Returns the cofactor of a matrix."""

Given that this does, I assume this _is_ a class method.

So are you putting _determinant() inside the class?  If so, you should
either make it method, and invoke it as self._determinant(), or bring it
outside the class into the global scope, in which case your code should
work.

Cheers,
Jason.



From lkennedy5 at gmail.com  Fri May 29 16:34:37 2009
From: lkennedy5 at gmail.com (lkennedy5 at gmail.com)
Date: Fri, 29 May 2009 13:34:37 -0700 (PDT)
Subject: CRLF when doing os.system("ls -l") while using curses !!!
Message-ID: <dc9db609-f79c-4bd6-8777-7743e6628a68@z19g2000vbz.googlegroups.com>

Here is the code and as you can see for yourself, the output is not
coming out on the screen with CRLF like it should.  How do I fix this?



import curses, os
screen = curses.initscr()
os.system("ls -l")
curses.endwin()


From rafalskiy at gmail.com  Fri May 29 16:43:45 2009
From: rafalskiy at gmail.com (s4g)
Date: Fri, 29 May 2009 13:43:45 -0700 (PDT)
Subject: Replacing module with a stub for unit testing
References: <852e3d2d-80a5-4de8-b948-f545e4bbcf9e@e21g2000yqb.googlegroups.com>
	<mailman.655.1243167260.8015.python-list@python.org>
	<02293ea4$0$21844$c3e8da3@news.astraweb.com>
Message-ID: <f35189e8-67bf-4bd3-a15e-28f5032885b0@e24g2000vbe.googlegroups.com>

Try

import sys
import ExpensiveModuleStub

sys.modules['ExpensiveModule'] = ExpensiveModuleStub
sys.modules['ExpensiveModule'].__name__ = 'ExpensiveModule'

Should do the trick


------
Vyacheslav


From emile at fenx.com  Fri May 29 16:56:06 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 29 May 2009 13:56:06 -0700
Subject: CRLF when doing os.system("ls -l") while using curses !!!
In-Reply-To: <dc9db609-f79c-4bd6-8777-7743e6628a68@z19g2000vbz.googlegroups.com>
References: <dc9db609-f79c-4bd6-8777-7743e6628a68@z19g2000vbz.googlegroups.com>
Message-ID: <gvpi97$aqg$1@ger.gmane.org>

On 5/29/2009 1:34 PM lkennedy5 at gmail.com said...
> Here is the code and as you can see for yourself, the output is not
> coming out on the screen with CRLF like it should. 

Mine did:

[root at falcon]# python2
Python 2.3.3 (#1, May 11 2004, 14:44:08)
[GCC 2.96 20000731 (Red Hat Linux 7.1 2.96-85)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import curses, os
 >>> screen = curses.initscr()
 >>> os.system("ls -l")
total 8
drwxr-xr-x    4 root     root         4096 Apr 28 14:42 fal
drwxr-xr-x    4 root     root         4096 Apr 28 14:43 home


> How do I fix this?

Provide details on your environment so others can duplicate the error.

Emile

> 
> 
> 
> import curses, os
> screen = curses.initscr()
> os.system("ls -l")
> curses.endwin()



From barry at python.org  Fri May 29 17:10:43 2009
From: barry at python.org (Barry Warsaw)
Date: Fri, 29 May 2009 17:10:43 -0400
Subject: [Python-mode] What text editor is everyone using for Python
In-Reply-To: <4A1E70DE.4080407@online.de>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<gvg5d7$382$2@lust.ihug.co.nz>	<mailman.741.1243325683.8015.python-list@python.org>	<roy-92C5E8.09222926052009@news.panix.com>	<mailman.782.1243385070.8015.python-list@python.org>	<4a1d628f$0$6471$426a74cc@news.free.fr>
	<op.uul09plha8ncjz@gnudebst> <4A1E70DE.4080407@online.de>
Message-ID: <B5BDBD32-3671-4171-ABEE-B87CC511D2F6@python.org>

On May 28, 2009, at 7:09 AM, Andreas Roehler wrote:

>> python-mode.el was its bloody-minded determination to regard '_' as  
>> a word
>> character, something which caused me more typing that it ever saved.
>>
>
> Its just one line to comment in python-mode.el, like this:
>
>  ;; (modify-syntax-entry ?\_ "w"  py-mode-syntax-table)

This one is ancient and I remember that Guido and I talked about this  
for a long time before settling on the behavior.

-Barry

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From pavlovevidence at gmail.com  Fri May 29 17:58:03 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 29 May 2009 14:58:03 -0700 (PDT)
Subject: try except inside exec
References: <gvor0g$679$1@nnrp-beta.newsland.it>
Message-ID: <980232fd-a19a-4444-8988-49a13f3e291b@h18g2000yqj.googlegroups.com>

On May 29, 7:21?am, Michele Petrazzo
<michele.petrazzo at REMOVE_me_unipex.it> wrote:
> Hi all,
> I want to execute a python code inside a string and so I use the exec
> statement. The strange thing is that the try/except couple don't catch
> the exception and so it return to the main code.
> Is there a solution to convert or make this code work?
>
> Thanks,
> Michele
>
> My code:
>
> STR = """
> err = 0
> try:
> ? ?def a_funct():
> ? ? ?1/0
> except:
> ? ?import traceback
> ? ?err = traceback.format_exc()
> """
>
> env = {}
> exec STR in env
> env["a_funct"]()
> print env["err"]
>
> My error:
> ? ?File "tmp/test_exec.py", line 14, in <module>
> ? ? ?env["a_funct"]()
> ? ?File "<string>", line 5, in a_funct
> ZeroDivisionError: integer division or modulo by zero



From beau at open-source-staffing.com  Fri May 29 18:10:30 2009
From: beau at open-source-staffing.com (OSS)
Date: Fri, 29 May 2009 15:10:30 -0700 (PDT)
Subject: [JOB] Plone Developer, Washington, D.C. - Relo OK | 55-75k
Message-ID: <0561a67f-f6f2-4458-9574-10095272cfb2@s21g2000vbb.googlegroups.com>

Plone Developer, Washington, D.C. - Relo OK | 55-75k

shiverat** Government security clearance required **
** Relocation assistance provided **

My client is seeking a full-time Plone Developer for work with the
federal government. The applicant will be responsible for
standardizing web formats already in place, ensuring 508 compliance,
and deploying content and making both routine and complex changes to
the website. In addition, the applicant should have expertise in
developing web architectures capable of facilitating complex technical
updates as well as managing voluminous materials. The applicant must
have substantial experience with developing or enhancing websites in a
Web 2.0 environment. Government security clearance required.

Required Skills:
* High level skills creating and managing application servers
* High level skills in the Plone base programming language Python,
CPython, and C
* Expert skills building Plone content management systems; preferably
with government experience

Nice to have skills: JavaScript, CSS, HTML, XML, XHTML, Flash,
Dreamweaver

To be considered, please submit your resume along with your salary
requirements to beau at open-source-staffing.com

Thank you,

Beau J. Gould
Open Source Staffing
www.open-source-staffing.com
beau at open-source-staffing.com

http://groups.yahoo.com/group/pythonzopejobs


From pavlovevidence at gmail.com  Fri May 29 18:20:00 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 29 May 2009 15:20:00 -0700 (PDT)
Subject: try except inside exec
References: <gvor0g$679$1@nnrp-beta.newsland.it>
Message-ID: <8393f3bc-a403-4ca6-bdc1-5cb90fa9f667@h11g2000yqb.googlegroups.com>

On May 29, 7:21?am, Michele Petrazzo
<michele.petrazzo at REMOVE_me_unipex.it> wrote:
> Hi all,
> I want to execute a python code inside a string and so I use the exec
> statement. The strange thing is that the try/except couple don't catch
> the exception and so it return to the main code.
> Is there a solution to convert or make this code work?
>
> Thanks,
> Michele
>
> My code:
>
> STR = """
> err = 0
> try:
> ? ?def a_funct():
> ? ? ?1/0
> except:
> ? ?import traceback
> ? ?err = traceback.format_exc()
> """

The exception isn't being raised because you haven't called the
function.  It's not an exception to define a function that does a
divide by zero, only to execute such a function.


> env = {}
> exec STR in env
> env["a_funct"]()

Here is where you call the function, thus the exception occurs here.


> print env["err"]

This line isn't actually being executed.  I'm not sure if you realize
that....

> My error:
> ? ?File "tmp/test_exec.py", line 14, in <module>
> ? ? ?env["a_funct"]()
> ? ?File "<string>", line 5, in a_funct
> ZeroDivisionError: integer division or modulo by zero

In general you can't know ahead of time what exceptions a function
might raise, so what you are trying to do can't be done.  You have to
handle the exception at the point where it is called.


And from another post:
> My goal is to execute a function received from a third-part,

The only time it's not a gaping security hole to run code supplied by
a thrid-party as-is is if the program is running on the third-party's
own computer.

If you're execing code on your computer that you didn't write or
thoroughly verify yourself--and you're obviously not doing that--then
you might as well just post your password publicly and say, "have at
it evil hackers".


Carl Banks


From piet at cs.uu.nl  Fri May 29 18:35:38 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 30 May 2009 00:35:38 +0200
Subject: CRLF when doing os.system("ls -l") while using curses !!!
References: <dc9db609-f79c-4bd6-8777-7743e6628a68@z19g2000vbz.googlegroups.com>
Message-ID: <m2hbz3edvp.fsf@cs.uu.nl>

>>>>> lkennedy5 at gmail.com (l) wrote:

>l> Here is the code and as you can see for yourself, the output is not
>l> coming out on the screen with CRLF like it should.  How do I fix this?

Don't use curses.

Curses puts the terminal in raw mode (more or less) which doesn't
translate the newline character into CRLF. If you use curses you are
supposed to do all output through curses. But the os.system goes
directly to the screen, outside of curses (because it is another
process).
You could catch the output of ls -l with a PIPE and then write the
output to the curses screen with addstr. But a curses screen has a
limited length, whereas your ls -l output may be larger so then you must
implement some form of scrolling.

>l> import curses, os
>l> screen = curses.initscr()
>l> os.system("ls -l")
>l> curses.endwin()

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From Scott.Daniels at Acm.Org  Fri May 29 18:45:38 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 29 May 2009 15:45:38 -0700
Subject: [JOB] Plone Developer, Washington, D.C. - Relo OK | 55-75k
In-Reply-To: <0561a67f-f6f2-4458-9574-10095272cfb2@s21g2000vbb.googlegroups.com>
References: <0561a67f-f6f2-4458-9574-10095272cfb2@s21g2000vbb.googlegroups.com>
Message-ID: <jLKdnViRY5ms-b3XnZ2dnUVZ_uSdnZ2d@pdx.net>

OSS wrote:
> Plone Developer, Washington, D.C. - Relo OK | 55-75k  ....

You should post this to the Python Jobs board, and not here.
     http://www.python.org/community/jobs/

--Scott David Daniels
Scott.Daniels at Acm.Org


From mk.fraggod at gmail.com  Fri May 29 19:03:07 2009
From: mk.fraggod at gmail.com (Mike Kazantsev)
Date: Sat, 30 May 2009 05:03:07 +0600
Subject: extract to dictionaries
In-Reply-To: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
References: <19ca3cd8-0dee-41bc-bf68-1007ca62536e@s21g2000vbb.googlegroups.com>
Message-ID: <20090530050307.7e3ad046@coercion>

On Thu, 28 May 2009 16:03:45 -0700 (PDT)
Marius Retegan <marius.s.retegan at gmail.com> wrote:

> Hello
> I have simple text file that I have to parse. It looks something like
> this:
> 
> parameters1
>      key1 value1
>      key2 value2
> end
> 
> parameters2
>      key1 value1
>      key2 value2
> end
> 
> So I want to create two dictionaries parameters1={key1:value1,
> key2:value2} and the same for parameters2.


You can use iterators to efficiently parse no-matter-how-large file.
Following code depends on line breaks and 'end' statement rather than
indentation.


  import itertools as it, operator as op, functools as ft
  from string import whitespace as spaces

  with open('test.src') as src:
    lines = it.ifilter(bool, it.imap(lambda x: x.strip(spaces), src))
    sections = ( (lines.next(), dict(it.imap(str.split, lines))) for sep,lines in
      it.groupby(lines, key=lambda x: x == 'end') if not sep )
    data = dict(sections)

  print data
  # { 'parameters2': {'key2': 'value2', 'key1': 'value1'},
  #  'parameters1': {'key2': 'value2', 'key1': 'value1'} }



To save namespace and make it a bit more unreadable you can write it
as a one-liner:

  with open('test.src') as src:
    data = dict( (lines.next(), dict(it.imap(str.split, lines))) for sep,lines in
      it.groupby(it.ifilter(bool, it.imap(lambda x: x.strip(spaces), src)),
      key=lambda x: x == 'end') if not sep )


-- 
Mike Kazantsev // fraggod.net
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From martin at v.loewis.de  Fri May 29 19:13:51 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 30 May 2009 01:13:51 +0200
Subject: Problem building 64-bit python 2.6.2 on Solaris 10
In-Reply-To: <d618518b-540c-46f1-aebc-576667da030b@o14g2000vbo.googlegroups.com>
References: <b53cac20-3d5f-4b39-ad2c-daf954ab39d7@s28g2000vbp.googlegroups.com>
	<4a1f0a2c$0$30886$9b622d9e@news.freenet.de>
	<d618518b-540c-46f1-aebc-576667da030b@o14g2000vbo.googlegroups.com>
Message-ID: <4a206c2f$0$13438$9b622d9e@news.freenet.de>

>>> I think the problem is it should be built with v9.S for 64-bit, not
>>> v8.S.  Is that correct?  If so, how do I get it to use the right one?
>> The Solaris dynamic loader can't find it. Set LD_LIBRARY_PATH or
>> LD_RUN_PATH appropriately, or use crle(8).
>>
> I'm not sure I understand.  It appears that cc is compiling the wrong
> module, v8.S.

Ah, too much text - I was confused by you reporting two issues in a
single email message. That has exhausted my capacity for quick message
scanning.

So this is a ctypes problem. You'll have to ignore it - there is
absolutely no way that you could possibly build the ctypes module
with Sun CC (short of rewriting ctypes to support it, of course).
Use gcc if you need the ctypes module, or accept not having the ctypes
module available.

> You may be right about the first error.  It's being reported by ld,
> but -L/opt/openssl/lib/sparcv9 & -R/opt/openssl/lib/sparcv9 are being
> passed to cc.  It is able to find -lssl & -lcrypto, but I think python
> itself doesn't use the openssl libraries.  Since I see the chain
> "ld.so.1: python: fatal: libssl.so.0.9.8: open failed: No such file or
> directory", which I think means python itself doesn't know where they
> are at.  I checked python & libpython.so with ldd & neither uses
> libssl.so.  It seems to me there should be another way to tell python
> where to find it to build the module.  Does this make sense?

Unfortunately, no. It is definitely *not* Python who is searching for
these libraries. That you had been passing them to ld during linkage
doesn't help at all. Linking succeeds just fine; Python then tries
to load the the _ssl module, which in turn causes the *dynamic* linker
(ld.so.1) to search for the shared library; it doesn't find it and
therefore gives up loading _ssl.so.

Regards,
Martin


From celoserpa at gmail.com  Fri May 29 19:21:58 2009
From: celoserpa at gmail.com (Marcelo de Moraes Serpa)
Date: Fri, 29 May 2009 18:21:58 -0500
Subject: [Python-mode] What text editor is everyone using for Python
In-Reply-To: <B5BDBD32-3671-4171-ABEE-B87CC511D2F6@python.org>
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<gvg5d7$382$2@lust.ihug.co.nz>
	<mailman.741.1243325683.8015.python-list@python.org>
	<roy-92C5E8.09222926052009@news.panix.com>
	<mailman.782.1243385070.8015.python-list@python.org>
	<4a1d628f$0$6471$426a74cc@news.free.fr> <op.uul09plha8ncjz@gnudebst>
	<4A1E70DE.4080407@online.de>
	<B5BDBD32-3671-4171-ABEE-B87CC511D2F6@python.org>
Message-ID: <1e5bcefd0905291621v389d2f27y5c66e05f293c5089@mail.gmail.com>

stop! Use the editor you are comfortable with. No flame wars please, even
though Emacs is the way to enlightenment :)

On Fri, May 29, 2009 at 4:10 PM, Barry Warsaw <barry at python.org> wrote:

> On May 28, 2009, at 7:09 AM, Andreas Roehler wrote:
>
>  python-mode.el was its bloody-minded determination to regard '_' as a word
>>> character, something which caused me more typing that it ever saved.
>>>
>>>
>> Its just one line to comment in python-mode.el, like this:
>>
>>  ;; (modify-syntax-entry ?\_ "w"  py-mode-syntax-table)
>>
>
> This one is ancient and I remember that Guido and I talked about this for a
> long time before settling on the behavior.
>
> -Barry
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From norseman at hughes.net  Fri May 29 19:48:31 2009
From: norseman at hughes.net (norseman)
Date: Fri, 29 May 2009 16:48:31 -0700
Subject: Python, Tkinter and popen problem
In-Reply-To: <m2d49sck8f.fsf@cs.uu.nl>
References: <mailman.803.1243448972.8015.python-list@python.org>	<gvk2br$6bg$03$1@news.t-online.com>	<mailman.811.1243469678.8015.python-list@python.org>	<gvlnh2$n7t$02$1@news.t-online.com>	<mailman.855.1243537386.8015.python-list@python.org>
	<m2d49sck8f.fsf@cs.uu.nl>
Message-ID: <4A20744F.5090608@hughes.net>

Piet van Oostrum wrote:
>>>>>> norseman <norseman at hughes.net> (n) wrote:
> 
>> n> I have tried both and Popen2.popen2().
>> n> os.popen runs both way, contrary to docs.
> 
> What do you mean `os.popen runs both way'?

It reads from child while console writes directly to child -  thus 
eliminating the problem of coding a pass through from master.

> 
>> n> # master.py
>> n> import os
>> n> #                both lines work same
> 
> Of course, because 'r' is the default, and the bufsize for reading the
> pipe only influences the performance.
> 
>> n> #xx= os.popen("/mnt/mass/py/z6.py").readlines()
>> n> xx= os.popen("/mnt/mass/py/z6.py",'r',1).readlines()
>> n> #                I had hoped small buffer would force a sync (flush())
>> n> #                No such luck.
> 
> First, there is a difference between sync and flush. flush is writing
> out any output that is buffered in the application program for that
> file. Sync is writing out buffers (cache) in the operating system (to the
> disc, network connection or similar). We are talking here about
> flushing, not syncing. As we deal with a pipe, sync is not applicable.
> 
> Furthermore, whatever you do in the master program, such as setting the
> buffer size has nothing to do with what happens in the child, so it will
> not influence the flushing behaviour of the child. The only way to
> influence that would be to use a pty instead of a pipe, because most
> code uses a different buffering strategy for ttys and ptys compared to
> files and pipes.
> 
> The next error in your program is that you use readlines()
> This reads ALL input from your pipe before it proceeds. So essentially
> it waits until the child process is finished and therefore gives you the
> impression that it doesn't flush(). But it is not the child that is the
> problem it is your master.
> 
> What you should do is take the pipe and do a readline()/print loop.
> 
> #xx= os.popen("/mnt/mass/py/z6.py")
> 
> # popen is deprecated. Replace with subprocess:
> from subprocess import Popen, PIPE
> xx = Popen(["/mnt/mass/py/z6.py"], stdout=PIPE).stdout
> 
> while True:
>     line = xx.readline()
>     if not line: break
>     print "\t" + line,
> 
> The obvious:
> 
> for l in xx:
>     print "\t" + l,
> 
> doesn't work as the iterator for a file, including pipes, does a
> read ahead (see the doc on file.next()) and therefore is not suitable for
> interactive use.
> 
>> n> The direct question comes back to:
> 
>> n> How does one force a sync or flush() to take effect in Python with
>> n> Tkinter in use? Or just in Python period. The keyword being force.
> 
> So it should be clear by now that the answer is to use flush().
> And make sure you read AND process the flushed output in a proper way.
> 
> By the way, you have a nasty habit of using very unclear language to
> pose your problems in this newsgroup/mailing list, instead of writing a
> concise description and giving small examples of what code causes the
> problem. This makes it extremely difficult to help you. I had to read
> your messages at least 5 times to get an idea of what you were doing and
> what the problem was that you wanted to solve.
> 
> Maybe you are dyslectic or something similar, in which case I apologize.
> But anyway, I think you should learn to express yourself more clearly.
> There are also courses for that.
===============================

"...
> doesn't work as the iterator for a file, including pipes, does a
> read ahead (see the doc on file.next()) and therefore is not suitable
> for interactive use.
..."

If I understand you the above can be stated as:

The above does not work as an iterator for any file type, including
pipes, but it does do read aheads .... and therefore is not suitable for
interactive use.

If that is correct then read ahead is simply buffered file reads (grab a
chunk, parcel it out on demand) - yes?

As for "... not suitable for interactive ..." Really?  Except for
special purpose use the current interactive components are all buffered
for read ahead use.  Check the actual code for your keyboard, your mouse
and so forth. It's the read ahead that allows faster time to completion.
It's why C-code has the putch function.


Yes - Sync IS the bigger hammer!  If that is what is needed - so be it.
All character readers (byte at a time) should obey a flush(). Depending
on type, code for the reader controls whether or not it flushes
incomplete "lines" in the in-buffer(s). Proper implementation limits 
lost data on system crash.
In trying to use flush at the master side I keep getting messages
indicating strings (completed or not) are not flushable.  Strange 
practice.

---
from subprocess import Popen, PIPE
xx = Popen(["z6.py"], stdout=PIPE).stdout

while True:
     line = xx.readline()
     if not line: break
     print "\t" + line,
---
DOES WORK on Python 2.5.2 on Slackware 10.2 - THANK YOU VERY MUCH!!!
Isn't working on Windows. error message comes as one of two forms.
   1- %1 not found       #as shown above
   2- file not found     #as ...["python z6.py"]...
         same            #as #2 even with full paths given
I get the impression subprocess ignores system things on Windows.
The routines it purposes to replace do use them.  At any rate, 
subprocess is NOT consistent across platforms.

Some questions:
	1) "...], stdout=PIPE).stdout
                    ^            ^  why the double use?
	2) "if not line: break"  what tells what to look for EOL
                                    or is the use of 'line' missleading?
                                    is it a byte at a time output?
                                  how much CPU usage does the loop use?
                                  is there something in that loop that
                                    uses the system pipe triggers to
                                    reduce excessive CPU waste or does it
                                    constantly poll?  If so where does
                                    what code get put to signal (or set)
                                    the courtesy semiphores so it does
                                    not hog the system?


Again - Thank you for something that works.

Steve



From gagsl-py2 at yahoo.com.ar  Fri May 29 20:51:48 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 29 May 2009 21:51:48 -0300
Subject: DrPython (Windows) problems
References: <5ob025pmkjfk1pdfbhh2fsaeekceof32hk@4ax.com>
Message-ID: <op.uupwomjjx6zn5v@gabriel.sleipnir-bsas>

En Fri, 29 May 2009 16:11:17 -0300, chrisv <chrisv at nospam.invalid>  
escribi?:

> Running DrPython under Linux works great.  However, when I run it
> under Windows:

Better to ask questions specific to a certain program, in its specific  
forum/mailing list/whatever.
In this case, try http://drpython.sourceforge.net/help.html

-- 
Gabriel Genellina



From monogeo at gmail.com  Fri May 29 21:09:17 2009
From: monogeo at gmail.com (monogeo)
Date: Fri, 29 May 2009 18:09:17 -0700 (PDT)
Subject: MySQLdb 1.2.2 + python 2.6.2
Message-ID: <e3d11715-765f-459d-9605-f323a1844304@h18g2000yqj.googlegroups.com>

Hi all,

Are MySQLdb 1.2.2 and python 2.6.2 compatible? I went to
http://sourceforge.net/project/showfiles.php?group_id=22307, it
doesn't say it is compatible or not.

When trying to install MySQLdb 1.2.2 on my machine which is running
python 2.6.2 and windows XP, I get this error below.

I am able to install MySQLdb 1.2.2 successfully on another machine
which is running python 2.5.4 and windows XP.

Please help if you have any idea.

C:\temp>easy_install MySQL_python-1.2.2-py2.5-win32.egg
Processing MySQL_python-1.2.2-py2.5-win32.egg
Removing c:\python26\lib\site-packages\MySQL_python-1.2.2-py2.5-
win32.egg
Copying MySQL_python-1.2.2-py2.5-win32.egg to c:\python26\lib\site-
packages
MySQL-python 1.2.2 is already the active version in easy-install.pth

Installed c:\python26\lib\site-packages\mysql_python-1.2.2-py2.5-
win32.egg
Processing dependencies for MySQL-python==1.2.2
Searching for MySQL-python==1.2.2
Reading http://pypi.python.org/simple/MySQL-python/
Reading http://sourceforge.net/projects/mysql-python
Reading http://sourceforge.net/projects/mysql-python/
Best match: MySQL-python 1.2.2
Downloading http://internap.dl.sourceforge.net/sourceforge/mysql-python/MySQL-python-1.2.2.tar.gz
Processing MySQL-python-1.2.2.tar.gz
Running MySQL-python-1.2.2\setup.py -q bdist_egg --dist-dir c:
\docume~1\jchan\locals~1\temp\easy_install-d_b36i\MySQL-
python-1.2.2\egg-dist-tmp-w0_u2d
error: The system cannot find the file specified

Thanks in advance.



From bobby.house at gmail.com  Fri May 29 21:27:32 2009
From: bobby.house at gmail.com (Bobby)
Date: Fri, 29 May 2009 18:27:32 -0700 (PDT)
Subject: Questions about regex
References: <fe9f707f-aaf3-4ca6-859a-5b0c63904fc0@s28g2000vbp.googlegroups.com>
Message-ID: <07fd3b96-e614-42b7-beea-7a82a8f54149@k38g2000yqh.googlegroups.com>

On May 29, 1:26?pm, Jared.S.Ba... at gmail.com wrote:
> Hello,
>
> I'm new to python and I'm having problems with a regular expression. I
> use textmate as my editor and when I run the regex in textmate it
> works fine, but when I run it as part of the script it freezes. Could
> anyone help me figure out why this is happening and how to fix it.
> Here is the script:
>
> ======================================================
> # regular expression search and replace
> import sys, os, re, string, csv
>
> #Open the file and taking its data
> myfile=open('Steve_query3.csv') #Steve_query_test.csv
> #create an error flag ?to loop the script twice
> #store all file's data in the string object 'text'
> myfile.seek(0)
> text = myfile.read()
>
> for i in range(2):
> ? ? ? ? #def textParse(text, reRun):
> ? ? ? ? print 'how many times is this getting executed', i
>
> ? ? ? ? #Now to create the newfile 'test' and write our 'text'
> ? ? ? ? newfile = open('Steve_query3_out.csv', 'w')
> ? ? ? ? #open the new file and set it with 'w' for "write"
> ? ? ? ? #loop trough 'text' clean them up and write them into the 'newfile'
> ? ? ? ? ? ? ? ? ? ? ? ? #sub( ? pattern, repl, string[, count])
> ? ? ? ? ? ? ? ? ? ? ? ? #"sub("(?i)b+", "x", "bbbb BBBB")" returns 'x x'.
> ? ? ? ? text = re.sub('(\<(/?[^\>]+)\>)', "", text)#remove the HTML
> ? ? ? ? text = re.sub('/<!--(.|\s)*?-->/', "", text) #remove comments ?<!--[^
> \-]+-->
> ? ? ? ? text = re.sub('\/\*(.|\s)*?;}', "", text) #remove css formatting
> ? ? ? ? #remove a bunch of word formatting yuck
> ? ? ? ? text = re.sub("&nbsp;", " ", text)
> ? ? ? ? text = re.sub("&lt;", "<", text)
> ? ? ? ? text = re.sub("&gt;", ">", text)
> ? ? ? ? text = re.sub("&quot;|&rquot;|&ldquo;", "\'", text)
> #===================================
> #The two following lines are the ones giving me the problems
> ? ? ? ? text = re.sub("w:(.|\s)*?\n", "", text)
> ? ? ? ? text = re.sub("UnhideWhenUsed=(.|\s)*?\n", "", text)
> #===========================================
> ? ? ? ? text = re.sub(re.compile('^\r?\n?$', re.MULTILINE), '', text) #remove
> the extra whitespace
> ? ? ? ? #now write out the new file and close it
> ? ? ? ? newfile.write(text)
> ? ? ? ? newfile.close()
>
> ? ? ? ? #open the newfile and run the script again
> ? ? ? ? #Open the file and taking its data
>
> ? ? ? ? myfile=open('Steve_query3_out.csv') #Steve_query_test.csv
> ? ? ? ? #store all file's data in the string object 'text'
> ? ? ? ? myfile.seek(0)
> ? ? ? ? text = myfile.read()
>
> Thanks for the help,
>
> -Jared

Can you give a string that you would expect the regex to match and
what the expected result would be? Currently, it looks like the
interesting part of the regex (.|\s)*? would match any character of
any length once. There seems to be some redundancy that makes it more
confusing then it needs to be. I'm pretty sure that . will also match
anything that \s will match or maybe you just need to escape . because
you meant for it to be a literal.


From ldo at geek-central.gen.new_zealand  Fri May 29 21:35:37 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 30 May 2009 13:35:37 +1200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
	<gvkoep$oii$3@lust.ihug.co.nz>
	<0dcfcb4a-8844-420b-b2e2-c8e68419774d@p6g2000pre.googlegroups.com>
Message-ID: <gvq2h9$sos$3@lust.ihug.co.nz>

In message <0dcfcb4a-8844-420b-b2e2-
c8e68419774d at p6g2000pre.googlegroups.com>, John Machin wrote:

> If you need to escape % or _ in a LIKE argument, do whatever the host
> convention is.
> E.g. you are searching for text that contains literally "5% discount",
> with SQLite you could do:
> [avoiding backslashes and concomitant confusion]
>   LIKE '%5~% discount%' ESCAPE '~'
> on the command line, so using DB-API:
>   like_expr = user_input.replace("~", "~~").replace("%", "~%").replace
> (etc etc)

Sounds like an amazingly complicated, roundabout and not even reliable way 
of doing it.



From gagsl-py2 at yahoo.com.ar  Fri May 29 21:41:03 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 29 May 2009 22:41:03 -0300
Subject: FILE object in Python3.0 extension modules
References: <ce7a9fa5-0e35-47b4-bd4e-a68415aca1d5@h11g2000yqb.googlegroups.com>
Message-ID: <op.uupyypi5x6zn5v@gabriel.sleipnir-bsas>

En Fri, 29 May 2009 06:52:15 -0300, Joachim Dahl <dahl.joachim at gmail.com>  
escribi?:

> In Python2.x, I used PyFile_Check(obj) to check if a parameter was a
> file object.
>
> Now, in Python3.0 the same object (obtained as open('file.bin','wb'))
> is an
> io.BufferedWriter object.
>
> How do I perform type checking for such an object in the extension
> module,

I don't know which is the preferred way to check for a file object in 3.x  
- I hope someone can answer this more precisely. In principle, a file  
inherits from io.IOBase, but this class is defined in io.py and probably  
isn't intended to be used in C code. Other alternatives are _io._IOBase,  
PyIOBase_Type, and io.FileIO/_io.FileIO

> and how do I extract a FILE * object from it?  I browsed the C API
> documentation,  but
> couldn't find an answer.

I'd use PyObject_AsFileDescriptor
http://docs.python.org/dev/py3k/c-api/file.html

(Notice that the documentation is outdated; the PyFileObject type does not  
exist anymore, and a file isn't a wrapper around a FILE struct either)

> The purpose is to dump the contents of a Python extension type to disk
> as
> binary data using C's fwrite() function.

 From the above, I'd use write() with the file descriptor obtained from  
PyObject_AsFileDescriptor.

-- 
Gabriel Genellina



From lie.1296 at gmail.com  Fri May 29 21:41:44 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sat, 30 May 2009 01:41:44 GMT
Subject: How does Python's OOP feel?
In-Reply-To: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
Message-ID: <s90Ul.14593$y61.3202@news-server.bigpond.net.au>

Ikon wrote:
> I'm rather new to Python. I have PHP for my main language and I do
> some Java. They all have a very strict OO schema. As I red through
> Python's tutorial it seams it has nothing of those rules. No statical,
> abstract classes, functions, or variables.
> 
> I wish someone, who has experience in both Java/PHP/C# and Python
> would tell me how mush better/worse is it to program in a language
> that misses most of the OO parts!

import antigravity


From lie.1296 at gmail.com  Fri May 29 21:55:21 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sat, 30 May 2009 01:55:21 GMT
Subject: newbie: popen question
In-Reply-To: <662556cb-f2b4-4a6c-a612-176478612c12@q14g2000vbn.googlegroups.com>
References: <328e5cd4-bc4e-47bf-b8e2-91764351c525@g22g2000pra.googlegroups.com>
	<75004846-9f60-401f-9a7b-adbc28add28b@x31g2000prc.googlegroups.com>
	<gvm079$asb$1@hoshi.visyn.net>
	<662556cb-f2b4-4a6c-a612-176478612c12@q14g2000vbn.googlegroups.com>
Message-ID: <dm0Ul.14597$y61.6251@news-server.bigpond.net.au>

thebiggestbangtheory at gmail.com wrote:
> On May 28, 5:31 am, Sebastian Wiesner <basti.wies... at gmx.net> wrote:
>> <Sean DiZazzo ? Donnerstag, 28. Mai 2009 10:11>
>>
>>> Your best bet is to make sudo not ask for a password.  :)  If you
>>> don't have the rights, then you can use pexpect to do what you want to
>>> do.  http://pexpect.sourceforge.net/pexpect.html
>>> See the second example on that page.
>>> child = pexpect.spawn('scp foo myn... at host.example.com:.')
>>> child.expect ('Password:')
>>> child.sendline (mypassword)
>> The sudo password prompt is very configurable, so changing the configuration
>> to allow execution without password input is really the best option.
>>
>> --
>> Freedom is always the freedom of dissenters.
>>                                       (Rosa Luxemburg)
> 
> Thanks guys for helping out! very good answers :-)
> 
> Before I saw your answers, I tried the following,
> 
> output = subprocess.Popen(["sudo","-b", "code.sh", "arg1"],
> stdout=subprocess.PIPE).communicate()[0]
> 
> This seemed to push the shell execution process to the background and
> because my python program was invoked initially with sudo, it seems I
> did not need to enter a passwd again.
> 
> Any comments about this..any issues that you see will crop up?
> 
> Thanks a ton again.
> 
> 
> 

Is using gksu or kdesu feasible? Or maybe you could run "sudo -v" which
activates sudo then immediately run your "sudo command". This relies on
sudo not configured to not use timestamp though.


From gagsl-py2 at yahoo.com.ar  Fri May 29 22:00:19 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 29 May 2009 23:00:19 -0300
Subject: FILE object in Python3.0 extension modules
References: <ce7a9fa5-0e35-47b4-bd4e-a68415aca1d5@h11g2000yqb.googlegroups.com>
	<loom.20090529T114655-291@post.gmane.org>
Message-ID: <op.uupzutvax6zn5v@gabriel.sleipnir-bsas>

En Fri, 29 May 2009 08:48:26 -0300, Benjamin Peterson  
<benjamin at python.org> escribi?:

> Joachim Dahl <dahl.joachim <at> gmail.com> writes:
>>
>> How do I perform type checking for such an object in the extension
>> module,
>> and how do I extract a FILE * object from it?  I browsed the C API
>> documentation,  but
>> couldn't find an answer.
>
> You use PyObject_IsInstance to test if the object is an instance of  
> io.IOBase.

But you have to import the io module first, don't you? That's not usually  
necesary for most built in types -- e.g. PyFloat_Check just checks for a  
float object.

-- 
Gabriel Genellina



From benjamin at python.org  Fri May 29 22:24:32 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 30 May 2009 02:24:32 +0000 (UTC)
Subject: FILE object in Python3.0 extension modules
References: <ce7a9fa5-0e35-47b4-bd4e-a68415aca1d5@h11g2000yqb.googlegroups.com>
	<loom.20090529T114655-291@post.gmane.org>
	<op.uupzutvax6zn5v@gabriel.sleipnir-bsas>
Message-ID: <loom.20090530T022320-508@post.gmane.org>

Gabriel Genellina <gagsl-py2 <at> yahoo.com.ar> writes:
> But you have to import the io module first, don't you? That's not usually  
> necesary for most built in types -- e.g. PyFloat_Check just checks for a  
> float object.

Well, in 3.x, file is not longer a builtin type.






From sjmachin at lexicon.net  Fri May 29 22:51:32 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 29 May 2009 19:51:32 -0700 (PDT)
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org> 
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de> 
	<gvkoep$oii$3@lust.ihug.co.nz>
	<0dcfcb4a-8844-420b-b2e2-c8e68419774d@p6g2000pre.googlegroups.com>
	<gvq2h9$sos$3@lust.ihug.co.nz>
Message-ID: <55520c08-5b02-4231-b0f3-74eadecd6fd7@g1g2000yqh.googlegroups.com>

On May 30, 11:35?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <0dcfcb4a-8844-420b-b2e2-
>
> c8e684197... at p6g2000pre.googlegroups.com>, John Machin wrote:
> > If you need to escape % or _ in a LIKE argument, do whatever the host
> > convention is.
> > E.g. you are searching for text that contains literally "5% discount",
> > with SQLite you could do:
> > [avoiding backslashes and concomitant confusion]
> > ? LIKE '%5~% discount%' ESCAPE '~'
> > on the command line, so using DB-API:
> > ? like_expr = user_input.replace("~", "~~").replace("%", "~%").replace
> > (etc etc)
>
> Sounds like an amazingly complicated, roundabout and not even reliable way
> of doing it.

Please (a) explain what you mean (b) suggest a better way.


From gagsl-py2 at yahoo.com.ar  Fri May 29 23:56:52 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 30 May 2009 00:56:52 -0300
Subject: Trying to get cleaner XML output from a text file
References: <cf161cdb-a623-496a-af42-bb4d06ae74cb@s16g2000vbp.googlegroups.com>
Message-ID: <op.uup482qjx6zn5v@gabriel.sleipnir-bsas>

En Fri, 29 May 2009 14:09:10 -0300, iainemsley <iainemsley at googlemail.com>  
escribi?:

> I'm using Python2.5 to try and convert some text files into XML using
> xml.minidom. I'm currently doing some plays which have a structure
> like
> Scene 1
> Act 1
> blah blah
> Act2
> blah blah
> Scene 2
> Act 1
> and so on.

(I think you get the hierarchy wrong: usually a play contains some Acts;  
each act contains several Scenes)

> I'm trying to turn it into
> <div type="scene">1
>   <div type="act">1
>    <speech />
>   </div>
>   <div type="act">2
>    <speech />
>   </div>
> </div>
> (or ideally <div type="scene" id="1"> bit I can always come back to
> this later)

Using ElementTree is a lot easier than minidom:

import sys
 from itertools import groupby, count
import xml.etree.ElementTree as ET
import re

class Seq:
     "Automatic sequencer for acts/scenes"
     def __init__(self):
         self.act_nr = count(1)
         self.scene_nr = count(1)
     def next_scene(self):
         return self.scene_nr.next()
     def next_act(self):
         self.scene_nr = count(1)
         return self.act_nr.next()
seq = Seq()

def add_act(body, act_text):
     act = ET.SubElement(body, "div", type="act", id="a%s" % seq.next_act())
     for scene_text in scene_sep.split(act_text):
         add_scene(act, scene_text)

def add_scene(act, scene_text):
     scene = ET.SubElement(act, "div", type="scene", id="%ss%s" %  
(act.get("id"), seq.next_scene()))
     for p in paragraphs(scene_text.splitlines(True)):
         add_speech(scene, p)

def add_speech(scene, p):
     speech = ET.SubElement(scene, "speech")
     speech.text = p

body = ET.Element("body")
scene_sep = re.compile(r"Scene\s+[1-9]+", re.I)
act_sep = re.compile(r"Act\s+[1-9]+", re.I)
for act_text in act_sep.split(text):
     add_act(body, act_text)

doc = ET.ElementTree(body)
doc.write(sys.stdout)


-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Sat May 30 00:11:33 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 30 May 2009 01:11:33 -0300
Subject: FILE object in Python3.0 extension modules
References: <ce7a9fa5-0e35-47b4-bd4e-a68415aca1d5@h11g2000yqb.googlegroups.com>
	<loom.20090529T114655-291@post.gmane.org>
	<op.uupzutvax6zn5v@gabriel.sleipnir-bsas>
	<loom.20090530T022320-508@post.gmane.org>
Message-ID: <op.uup5xjo1x6zn5v@gabriel.sleipnir-bsas>

En Fri, 29 May 2009 23:24:32 -0300, Benjamin Peterson  
<benjamin at python.org> escribi?:

> Gabriel Genellina <gagsl-py2 <at> yahoo.com.ar> writes:
>> But you have to import the io module first, don't you? That's not  
>> usually
>> necesary for most built in types -- e.g. PyFloat_Check just checks for a
>> float object.
>
> Well, in 3.x, file is not longer a builtin type.

Ok, seems the old "file" type has been demoted and atomized...

-- 
Gabriel Genellina



From bsk16 at case.edu  Sat May 30 00:50:12 2009
From: bsk16 at case.edu (Benjamin Kaplan)
Date: Sat, 30 May 2009 00:50:12 -0400
Subject: How does Python's OOP feel?
In-Reply-To: <s90Ul.14593$y61.3202@news-server.bigpond.net.au>
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
	<s90Ul.14593$y61.3202@news-server.bigpond.net.au>
Message-ID: <ec96e1390905292150n56f2fcd3w69ad9186a6ad674f@mail.gmail.com>

On Fri, May 29, 2009 at 9:41 PM, Lie Ryan <lie.1296 at gmail.com> wrote:

> Ikon wrote:
> > I'm rather new to Python. I have PHP for my main language and I do
> > some Java. They all have a very strict OO schema. As I red through
> > Python's tutorial it seams it has nothing of those rules. No statical,
> > abstract classes, functions, or variables.
> >
> > I wish someone, who has experience in both Java/PHP/C# and Python
> > would tell me how mush better/worse is it to program in a language
> > that misses most of the OO parts!
>
> import antigravity


You forgot the link. http://www.xkcd.com/353/

>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From bellman at lysator.liu.se  Sat May 30 01:44:57 2009
From: bellman at lysator.liu.se (Thomas Bellman)
Date: Sat, 30 May 2009 05:44:57 +0000 (UTC)
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
	<gvlppt$hk0$1@news.lysator.liu.se> <gvmudo$25d$2@lust.ihug.co.nz>
Message-ID: <gvqh4p$obn$1@news.lysator.liu.se>

Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:

> In message <gvlppt$hk0$1 at news.lysator.liu.se>, Thomas Bellman wrote:

>> Speaking as a sysadmin, running applications for production,
>> programs not using SO_REUSEADDR should be taken out and shot.

>> Not using SO_REUSEADDR means forcing a service interruption of
>> half an hour (IIRC) if for some reason the service must be
>> restarted, or having to reboot the entire machine.

> No, you do not recall correctly.

*Tests*  It seems to be 100 seconds in Fedora 9 and 60 seconds in
Solaris 10.  OK, that amount of time is not totally horrible, in
many cases just annoying.  Still much longer for an interruption
of service that could have been just 1-2 seconds.

However, I *have* used systems where it took much longer.  It was
slightly more than ten years ago, under an earlier version of
Solaris 2, problably 2.4.  It may be that it only took that long
under certain circumstances that the application we used always
triggered, but we did have to wait several tens of minutes.  It
was way faster to reboot the machine than waiting for the sockets
to time out.

> And anybody wanting to reboot a machine to
> work around a "problem" like that should be taken out and shot.

We weren't exactly keen on rebooting the machine, but it was the
fastest way of getting out of that situation that we could figure
out.  How *should* we have dealt with it in your opinion?


-- 
Thomas Bellman,   Lysator Computer Club,   Link??ping University,  Sweden
"God is real, but Jesus is an integer."      !  bellman @ lysator.liu.se
                                             !  Make Love -- Nicht Wahr!


From zak.mc.kraken at libero.it  Sat May 30 02:38:46 2009
From: zak.mc.kraken at libero.it (Vito De Tullio)
Date: Sat, 30 May 2009 08:38:46 +0200
Subject: problem with pylint + PyQt4
Message-ID: <gvqk9k$a43$1@ger.gmane.org>

I'm having probles using pylint on a PyQt4 application.

$ cat TEST_pylint.py 
import PyQt4.QtCore                
from PyQt4.QtGui import QApplication

$ python TEST_pylint.py # no import errors

$ pylint --disable-msg=C0103 --disable-msg=C0111 --disable-msg=W0611 \
>     TEST_pylint.py
************* Module TEST_pylint
E:  1: No name 'QtCore' in module 'PyQt4'
E:  2: No name 'QtGui' in module 'PyQt4'
[...cut...]

$ pylint --version
pylint 0.15.0,
astng 0.17.3, common 0.35.0
Python 2.6 (r26:66714, Feb  3 2009, 20:52:03)
[GCC 4.3.2 [gcc-4_3-branch revision 141291]]

$ rpm -q python-qt4
python-qt4-4.5.snapshot.20090507-9.3

why pylint can't find the PyQt4 submodules?

-- 
By ZeD



From stefan_ml at behnel.de  Sat May 30 04:00:22 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 30 May 2009 10:00:22 +0200
Subject: lxml: traverse xml tree and retrieve element based on an attribute
In-Reply-To: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>
References: <4f202e48-af37-4bb0-9411-fcdf581fdcd4@e23g2000vbe.googlegroups.com>
Message-ID: <4a20e796$0$32666$9b4e6d93@newsspool2.arcor-online.net>

byron wrote:
> I am using the lxml.etree library to validate an xml instance file
> with a specified schema that contains the data types of each element.
> This is some of the internals of a function that extracts the
> elements:
> 
>         schema_doc = etree.parse(schema_fn)
>         schema = etree.XMLSchema(schema_doc)
> 
>         context = etree.iterparse(xml_fn, events=('start', 'end'),
> schema=schema)
> 
>         # get root
>         event, root = context.next()
> 
>         for event, elem in context:
>             if event == 'end' and elem.tag == self.tag:
>                 yield elem
>             root.clear()

Note that you cannot modify the root element during iterparse() in
lxml.etree. It seems to work for you here, but it's not safe. Here's a
better way to do this.

http://www.ibm.com/developerworks/xml/library/x-hiperfparse/#N100FF

Stefan


From ken at seehart.com  Sat May 30 04:12:09 2009
From: ken at seehart.com (Ken Seehart)
Date: Sat, 30 May 2009 01:12:09 -0700
Subject: Browser based Canvas UI?
In-Reply-To: <m2eiu7g5xv.fsf@cs.uu.nl>
References: <alpine.DEB.1.10.0905291352130.14054@urchin.earth.li>
	<m2eiu7g5xv.fsf@cs.uu.nl>
Message-ID: <4A20EA59.50108@seehart.com>

A couple years ago I stumbled upon an interesting technology but I can't 
seem to find it, and I can remember what it is called.  Unfortunately 
this makes it difficult to search for.  I am am aware of several partial 
matches (items that meet a subset of the requirement listed below).  
Does anyone know what does /all/ of the following?

1. Works on at least FF and IE on XP and Linux out of the box, probably 
others

2. Does not require /any/ plugin download at all of any kind to view 
(this disqualifies flash, svg, silverlight, java, and others)

3. If you go to the web page for the first time on a freshly installed 
operating system, without admin privileges, you will see the 
functionality listed below immediately, and with no downloaded plugins 
and installers.  (I apologize for the redundancy, but I want to 
preemptively avoid a flood of non-applicable responses).

4. Graphics, including sprite animation

5. Dynamic response to mouse motion: dragging sprites for example

6. Programmable in Python, of course

Hints from what I can recall:
- Built from javascript as it's raw material under the hood (after all, 
it can't very well be anything else given requirements 1,2,3)
- Seems quite magical since I didn't know the necessary graphical raw 
materials existed in javascript
- I think it's based on Ajax, but I can't seem to find a relevant python 
demo of it due to too much clutter in my google searches

Ken



From piet at cs.uu.nl  Sat May 30 04:30:41 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 30 May 2009 10:30:41 +0200
Subject: Python, Tkinter and popen problem
References: <mailman.803.1243448972.8015.python-list@python.org>
	<gvk2br$6bg$03$1@news.t-online.com>
	<mailman.811.1243469678.8015.python-list@python.org>
	<gvlnh2$n7t$02$1@news.t-online.com>
	<mailman.855.1243537386.8015.python-list@python.org>
	<m2d49sck8f.fsf@cs.uu.nl>
	<mailman.908.1243640893.8015.python-list@python.org>
Message-ID: <m2d49rdmby.fsf@cs.uu.nl>

>>>>> norseman <norseman at hughes.net> (n) wrote:

>n> Piet van Oostrum wrote:
>>>>>>>> norseman <norseman at hughes.net> (n) wrote:
>>> 
>n> I have tried both and Popen2.popen2().
>n> os.popen runs both way, contrary to docs.
>>> 
>>> What do you mean `os.popen runs both way'?

>n> It reads from child while console writes directly to child -  thus
>n> eliminating the problem of coding a pass through from master.

Yes, but that is not `both way': popen connects the parent to the child
through a pipe. The pipe works one way: from the child to the parent
with 'r' (default), from the parent to the child with 'w'. You can't
communicate the other way through the pipe. So the communication from
the parent process to the child through the popen is ONE WAY. If you
want TWO WAY communication you can use popen2, or better use
subprocess.Popen.

A child process always inherits stdin, stdout and stderr from the parent
unless you change that (e.g. by redirecting to a pipe, like popen does
for one of them). It doesn't matter whether you use os.popen,
subprocess.Popen, os.system, or os.fork to create the child process. So
in your case if the parent inputs from the console, so does the child.
But note: this is not communication from the parent process to the
child, but from YOU to the child. So the parent-child communication is
ONE WAY.

>n> "...
>>> doesn't work as the iterator for a file, including pipes, does a
>>> read ahead (see the doc on file.next()) and therefore is not suitable
>>> for interactive use.
>n> ..."

>n> If I understand you the above can be stated as:

>n> The above does not work as an iterator for any file type, including
>n> pipes, but it does do read aheads .... and therefore is not suitable for
>n> interactive use.

For files in general it is no problem because the contents of the file
is not interactively generated. Read ahead on a file works as long as
you do'nt use readline() on the file in between the iterator actions.
For a socket it could be the same problem if the other side generates
the output interactively.

>n> If that is correct then read ahead is simply buffered file reads (grab a
>n> chunk, parcel it out on demand) - yes?

I don't know, I have looked into the source code but it isn't clear to
me. I noticed that iteration didn't work and then looked up the
documentation. It talks about read ahead for efficiency.
 
>n> As for "... not suitable for interactive ..." Really?  Except for
>n> special purpose use the current interactive components are all buffered
>n> for read ahead use.  Check the actual code for your keyboard, your mouse
>n> and so forth. It's the read ahead that allows faster time to completion.
>n> It's why C-code has the putch function.

Yes, but they only read what is available. The iterator apparently tries
to read more and then has to wait.

>n> Yes - Sync IS the bigger hammer!  If that is what is needed - so be it.
>n> All character readers (byte at a time) should obey a flush(). Depending
>n> on type, code for the reader controls whether or not it flushes
>n> incomplete "lines" in the in-buffer(s). Proper implementation limits lost
>n> data on system crash.

I don't understand what you say here. As I told before it has nothing to
do with sync(). Also for reading there is no flush(); the flush() is
done on the other side of the pipe. Yes, and sync() has to do with
system crashes but that is not what we are talking about in this thread.

>n> In trying to use flush at the master side I keep getting messages
>n> indicating strings (completed or not) are not flushable.  Strange practice.

If you print to the console in the master the flush is done
automatically.

>n> ---
>n> from subprocess import Popen, PIPE
>n> xx = Popen(["z6.py"], stdout=PIPE).stdout

>n> while True:
>n>     line = xx.readline()
>n>     if not line: break
>n>     print "\t" + line,
>n> ---
>n> DOES WORK on Python 2.5.2 on Slackware 10.2 - THANK YOU VERY MUCH!!!
>n> Isn't working on Windows. error message comes as one of two forms.
>n>   1- %1 not found       #as shown above
>n>   2- file not found     #as ...["python z6.py"]...
>n>         same            #as #2 even with full paths given

That should be Popen(["python", "z6.py"], stdout=PIPE).stdout
And then with both python and z6.py given as full paths.

>n> I get the impression subprocess ignores system things on Windows.
>n> The routines it purposes to replace do use them.  At any rate, subprocess
>n> is NOT consistent across platforms.

subprocess is, but Windows isn't. On Unix-like systems, the python
command is usually in your PATH, so just giving "python" works. In
Windows PATH is underused, and commands like python often are not in
PATH, unless you as a user has adapted the path, or maybe there is an
installation option to adapt the PATH. The reason probably is that in
Windows almost nobody uses the command line but only clicks and the PATH
is not relevant.

>n> Some questions:
>n> 	1) "...], stdout=PIPE).stdout
>n>                    ^            ^  why the double use?

It is not a double use. Popen(["z6.py"], stdout=PIPE) gives you a Popen
object, not a file object. If you add .stdout you get the stdout
attribute of the Popen object of which you just before stated that it
should be a pipe. So the stdout=PIPE parameter makes it create a pipe,
and the .stdout returns you that pipe.

>n> 	2) "if not line: break"  what tells what to look for EOL
>n>                                    or is the use of 'line' missleading?
>n>                                    is it a byte at a time output?

No, line is a line, as indicated by the readline() call. The 
"if not line" is a test for end of file. In this case the end of the
child process (pipe closed).

>n>                                  how much CPU usage does the loop use?

Not much, It is mainly waiting for input but that doesn't consume CPU.

>n>                                  is there something in that loop that
>n>                                    uses the system pipe triggers to
>n>                                    reduce excessive CPU waste or does it
>n>                                    constantly poll?  If so where does
>n>                                    what code get put to signal (or set)
>n>                                    the courtesy semiphores so it does
>n>                                    not hog the system?

It doesn't poll or use semaphores. The beauty of a pipe is that it
automatically synchronises the reader and writer processes. If you do a
read on a pipe and it is empty the OS just blocks you. When the other
end writes something in the pipe, the OS will unblock you.

-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From debatem1 at gmail.com  Sat May 30 04:52:30 2009
From: debatem1 at gmail.com (CTO)
Date: Sat, 30 May 2009 01:52:30 -0700 (PDT)
Subject: Browser based Canvas UI?
References: <alpine.DEB.1.10.0905291352130.14054@urchin.earth.li> 
	<m2eiu7g5xv.fsf@cs.uu.nl>
	<mailman.920.1243671153.8015.python-list@python.org>
Message-ID: <0b03f0ff-11ee-4ee2-ad2b-9c1516d22259@e21g2000yqb.googlegroups.com>

On May 30, 4:12?am, Ken Seehart <k... at seehart.com> wrote:
> A couple years ago I stumbled upon an interesting technology but I can't
> seem to find it, and I can remember what it is called. ?Unfortunately
> this makes it difficult to search for. ?I am am aware of several partial
> matches (items that meet a subset of the requirement listed below). ?
> Does anyone know what does /all/ of the following?
>
> 1. Works on at least FF and IE on XP and Linux out of the box, probably
> others
>
> 2. Does not require /any/ plugin download at all of any kind to view
> (this disqualifies flash, svg, silverlight, java, and others)
>
> 3. If you go to the web page for the first time on a freshly installed
> operating system, without admin privileges, you will see the
> functionality listed below immediately, and with no downloaded plugins
> and installers. ?(I apologize for the redundancy, but I want to
> preemptively avoid a flood of non-applicable responses).
>
> 4. Graphics, including sprite animation
>
> 5. Dynamic response to mouse motion: dragging sprites for example
>
> 6. Programmable in Python, of course
>
> Hints from what I can recall:
> - Built from javascript as it's raw material under the hood (after all,
> it can't very well be anything else given requirements 1,2,3)
> - Seems quite magical since I didn't know the necessary graphical raw
> materials existed in javascript
> - I think it's based on Ajax, but I can't seem to find a relevant python
> demo of it due to too much clutter in my google searches
>
> Ken

Probably thinking of Pyjamas- <URL: http://pyjamas.sourceforge.net/>.
It lets you interact with canvas- <URL: http://www.blobsallad.se/>-
without writing any javascript.

Geremy Condra


From tiskanto at gmail.com  Sat May 30 04:58:49 2009
From: tiskanto at gmail.com (Teguh Iskanto)
Date: Sat, 30 May 2009 18:58:49 +1000
Subject: How does Python's OOP feel?
In-Reply-To: <ec96e1390905292150n56f2fcd3w69ad9186a6ad674f@mail.gmail.com>
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>
	<s90Ul.14593$y61.3202@news-server.bigpond.net.au>
	<ec96e1390905292150n56f2fcd3w69ad9186a6ad674f@mail.gmail.com>
Message-ID: <e137e8260905300158w5e18ff56x3169b4b3d4243163@mail.gmail.com>

On Sat, May 30, 2009 at 2:50 PM, Benjamin Kaplan <bsk16 at case.edu> wrote:

>
>
> On Fri, May 29, 2009 at 9:41 PM, Lie Ryan <lie.1296 at gmail.com> wrote:
>
>> Ikon wrote:
>> > I'm rather new to Python. I have PHP for my main language and I do
>> > some Java. They all have a very strict OO schema. As I red through
>> > Python's tutorial it seams it has nothing of those rules. No statical,
>> > abstract classes, functions, or variables.
>> >
>> > I wish someone, who has experience in both Java/PHP/C# and Python
>> > would tell me how mush better/worse is it to program in a language
>> > that misses most of the OO parts!
>>
>> import antigravity
>
>
> You forgot the link. http://www.xkcd.com/353/
>


ha ha ha ha +1
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From martin at hvidberg.net  Sat May 30 05:33:03 2009
From: martin at hvidberg.net (martin at hvidberg.net)
Date: Sat, 30 May 2009 02:33:03 -0700 (PDT)
Subject: Q: finding distance between 2 time's
Message-ID: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>

I made this little script (below) to look througt a dir to see if
there are any files newer than .e.g. 1 hour.
I have the loop through the dir working and can retreive file time as
well as present time.
both time variables are in the format returned by time.localtime()

My question:
How do I find the difference between such two time variables, to
calculate the 'age' of the file?

:-) Martin

------8<------ Code begin -------------

import os, time

def buildList(directory):
    listing = os.listdir(directory)
    for x in listing:
        x = os.path.join(directory, x)
        if os.path.isdir(x):
            print ('dir -> %s') % x
        if os.path.isfile(x):
            tstF = time.localtime(os.path.getmtime(x))
            nSize = os.path.getsize(x)
            print ('fil -> %s %d @ %s') % (x, nSize, time.asctime
(tstF))
    return 0

tstN = time.localtime()
print tstN
print "Time now: %s" % time.asctime(tstN)
buildList('C:\Martin\Work\Work_Eclipse\.metadata')




From ken at seehart.com  Sat May 30 06:01:20 2009
From: ken at seehart.com (Ken Seehart)
Date: Sat, 30 May 2009 03:01:20 -0700
Subject: How does Python's OOP feel?
In-Reply-To: <ec96e1390905292150n56f2fcd3w69ad9186a6ad674f@mail.gmail.com>
References: <fd08bfcd-eb14-45ee-ad82-3f1c9a4fd3d7@g19g2000yql.googlegroups.com>	<s90Ul.14593$y61.3202@news-server.bigpond.net.au>
	<ec96e1390905292150n56f2fcd3w69ad9186a6ad674f@mail.gmail.com>
Message-ID: <4A2103F0.4070603@seehart.com>

Benjamin Kaplan wrote:
>
>
> On Fri, May 29, 2009 at 9:41 PM, Lie Ryan <lie.1296 at gmail.com 
> <mailto:lie.1296 at gmail.com>> wrote:
>
>     Ikon wrote:
>     > I'm rather new to Python. I have PHP for my main language and I do
>     > some Java. They all have a very strict OO schema. As I red through
>     > Python's tutorial it seams it has nothing of those rules. No
>     statical,
>     > abstract classes, functions, or variables.
>     >
>     > I wish someone, who has experience in both Java/PHP/C# and Python
>     > would tell me how mush better/worse is it to program in a language
>     > that misses most of the OO parts!
>
Some of the concepts that you are looking for might be present in Python 
but may look different than you expect.   If you are defining OO in 
terms of rules and constraints, Python might come up short.   But if you 
are looking for the /benefits/ of OOP, Python does quite well.

I have experience with all of those languages.  More Java than PHP and 
C#, so I can talk about Python and Java.

Originally, the definition of OOP was about concepts such as loose 
coupling, reusable components, focusing on things rather than 
procedures, etc.  Later the prevalent definition became more about what 
you are not allowed to do than how to do what you want to do.  So now we 
put more stress on ideas like strict encapsulation.  For example, some 
purists even suggest that you can't claim to implement encapsulation 
unless you guarantee that there is no possible way to determine 
implementation details from outside.  Python "fails" here because it has 
introspective features that allow you to bypass the limitations that are 
deemed necessary for some artificially strict definition of OOP.  For 
example strictly speaking we don't have private members, but we can 
start a name with underscore or double-underscore which for all 
practical purposes gives all the advantages of private members if we 
assume a certain level of maturity from our programmers.  A less 
restrictive notion of encapsulation might be that objects can be managed 
without the need to know the implementation details.

If you think in terms of the enabling qualities of OOP, but not the 
constraints, Python does in fact score quite high.  We have multiple 
inheritance, abstraction (in the non-fascist sense), encapsulation 
(again in the non-fascist sense), really easy polymorphism, and plenty 
of support for decoupling.

When people claim that python is not OO, they are for the most part only 
able to cite what python fails to prevent you from doing, not what 
python fails to allow you to do.  At the same time, I must admit that 
the constraints imposed by stricter languages, such as compile time 
detection of certain errors, and performance benefits associated with 
static typing.  Fortunately, tools such as pylint and psyco can close 
these two respective gaps to a significant degree.

Okay, enough theory and straw man arguments :)  Here's how it /feels/ to me.

What is missing from Python, as compared to Java, is an oppressive 
system to prevent you from writing bugs no matter what.  As it turn out, 
I found that I was quite capable of writing bugs in Java in spite of 
it's extreme efforts to save me from myself.  I also found that Java 
requires a great deal more lines of code to get to the desired results.  
Most of the lines of code are about making the compiler happy.  If I try 
to do anything metaprogrammingish in Java, I soon start pulling my hair 
out.  After switching to mostly python, I have grown nearly all of my 
hair back.

Once the Java compiler is happy with the syntax, certain kinds of bugs 
are prevented that might exist in corresponding python code.  This is a 
win for Java.  However, because the code is more complex in Java, and 
because it is harder to add clever introspective debugging 
instrumentation, the remaining bugs are harder to find.  I believe that 
all other things being equal, less code is more robust than more code.

I highly recommend using pylint, BTW.  If you use pylint, you are just 
about as safe as you would be with a more oppressive language.

When it is all done, I find that I can get to a bug free, scalable, 
flexible, object oriented result much more quickly in Python than in 
Java, but YMMV.

In summary, Python has all of the capabilities of OOP, but lacks some of 
the constraints of OOP.  This lack of constraints has it's advantages 
and disadvantages, but on the whole, I like it.  What else can I say?

See also:
  http://www.ferg.org/projects/python_java_side-by-side.html

Ken


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From jkv at unixcluster.dk  Sat May 30 06:06:55 2009
From: jkv at unixcluster.dk (jkv)
Date: Sat, 30 May 2009 12:06:55 +0200
Subject: Q: finding distance between 2 time's
In-Reply-To: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
Message-ID: <4A21053F.8080408@unixcluster.dk>

Hi Martin,

What i usally do is to convert the two times to seconds since epoch and
compare the two values in seconds. You can use time.mktime to convert
localtime to seconds since epoch.

I added a few lines to your script, and now it ought to only print files
newer than 3601 seconds (3600 seconds is one hour).
The modification to you script is just some quick code, im pretty sure
on can compress it a bit.

Regards,
Johnny

script:

import os, time

def buildList(directory):
    listing = os.listdir(directory)
    for x in listing:
        x = os.path.join(directory, x)
        if os.path.isdir(x):
            print ('dir -> %s') % x
        if os.path.isfile(x):
            current_time = time.localtime()
            tstF = time.localtime(os.path.getmtime(x))
            #convert the current time to seconds since epoch
            current_epoch=time.mktime(current_time)
            #convert the timestamp on the file to seconds since epoch
            file_epoch = time.mktime(tstF)
            nSize = os.path.getsize(x)
            time_difference = current_epoch - file_epoch
            #if file newer than one hour print a line
            if time_difference < 3601:
              print ('NEW FILE -> %s %d @ %s') % (x, nSize, time.asctime
(tstF))
   return 0

tstN = time.localtime()
print tstN
print "Time now: %s" % time.asctime(tstN)
buildList('/')


martin at hvidberg.net wrote:
> I made this little script (below) to look througt a dir to see if
> there are any files newer than .e.g. 1 hour.
> I have the loop through the dir working and can retreive file time as
> well as present time.
> both time variables are in the format returned by time.localtime()
>
> My question:
> How do I find the difference between such two time variables, to
> calculate the 'age' of the file?
>
> :-) Martin
>
> ------8<------ Code begin -------------
>
> import os, time
>
> def buildList(directory):
>     listing = os.listdir(directory)
>     for x in listing:
>         x = os.path.join(directory, x)
>         if os.path.isdir(x):
>             print ('dir -> %s') % x
>         if os.path.isfile(x):
>             tstF = time.localtime(os.path.getmtime(x))
>             nSize = os.path.getsize(x)
>             print ('fil -> %s %d @ %s') % (x, nSize, time.asctime
> (tstF))
>     return 0
>
> tstN = time.localtime()
> print tstN
> print "Time now: %s" % time.asctime(tstN)
> buildList('C:\Martin\Work\Work_Eclipse\.metadata')
>
>
>   


-- 
Regards,
jkv
http://unixcluster.dk/public.key



From bearophileHUGS at lycos.com  Sat May 30 06:41:32 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sat, 30 May 2009 03:41:32 -0700 (PDT)
Subject: Questions about regex
References: <fe9f707f-aaf3-4ca6-859a-5b0c63904fc0@s28g2000vbp.googlegroups.com>
Message-ID: <54dd607a-d9fd-4ed2-91fd-690036734862@i6g2000yqj.googlegroups.com>

Jared.S., even if a regex doesn't look like a program, it's like a
small program written in a strange language. And you have to test and
comment your programs.
So I suggest you to program in a more tidy way, and add unit tests
(doctests may suffice here) to your regexes, you can also use the
verbose mode and comment them, and you can even indent their sub-parts
as pieces of a program.
You must test all your bricks (in python, not in TextMate) before
using them to build something bigger.

Bye,
bearophile


From ken at seehart.com  Sat May 30 07:46:05 2009
From: ken at seehart.com (Ken Seehart)
Date: Sat, 30 May 2009 04:46:05 -0700
Subject: Browser based Canvas UI?
In-Reply-To: <0b03f0ff-11ee-4ee2-ad2b-9c1516d22259@e21g2000yqb.googlegroups.com>
References: <alpine.DEB.1.10.0905291352130.14054@urchin.earth.li>
	<m2eiu7g5xv.fsf@cs.uu.nl>	<mailman.920.1243671153.8015.python-list@python.org>
	<0b03f0ff-11ee-4ee2-ad2b-9c1516d22259@e21g2000yqb.googlegroups.com>
Message-ID: <4A211C7D.5050309@seehart.com>

CTO wrote:
> On May 30, 4:12 am, Ken Seehart <k... at seehart.com> wrote:
>   
>> A couple years ago I stumbled upon an interesting technology but I can't
>> seem to find it, and I can remember what it is called.  Unfortunately
>> this makes it difficult to search for.  I am am aware of several partial
>> matches (items that meet a subset of the requirement listed below).  
>> Does anyone know what does /all/ of the following?
>>
>> 1. Works on at least FF and IE on XP and Linux out of the box, probably
>> others
>>
>> 2. Does not require /any/ plugin download at all of any kind to view
>> (this disqualifies flash, svg, silverlight, java, and others)
>>
>> 3. If you go to the web page for the first time on a freshly installed
>> operating system, without admin privileges, you will see the
>> functionality listed below immediately, and with no downloaded plugins
>> and installers.  (I apologize for the redundancy, but I want to
>> preemptively avoid a flood of non-applicable responses).
>>
>> 4. Graphics, including sprite animation
>>
>> 5. Dynamic response to mouse motion: dragging sprites for example
>>
>> 6. Programmable in Python, of course
>>
>> Hints from what I can recall:
>> - Built from javascript as it's raw material under the hood (after all,
>> it can't very well be anything else given requirements 1,2,3)
>> - Seems quite magical since I didn't know the necessary graphical raw
>> materials existed in javascript
>> - I think it's based on Ajax, but I can't seem to find a relevant python
>> demo of it due to too much clutter in my google searches
>>
>> Ken
>>     
>
> Probably thinking of Pyjamas- <URL: http://pyjamas.sourceforge.net/>.
> It lets you interact with canvas- <URL: http://www.blobsallad.se/>-
> without writing any javascript.
>
> Geremy Condra
>   
Yeah, looks like pyjamas is probably it.  Thanks.

OMG,  http://www.blobsallad.se is way too cool, .but it's javascript, so 
I'm assuming the idea is that it could have been done in python and 
converted to javascript using pyjamas.

Anyway, I think I need to be more specific about the sprites:

7. Supports drawing semi-transparent bitmap sprites (preferably png)

Anyone happen to know where I can find an online example of animating 
with sprites (within the constraints of 1-7 above)?

Thanks,
- Ken



From 2009 at jmunch.dk  Sat May 30 07:52:17 2009
From: 2009 at jmunch.dk (Anders J. Munch)
Date: Sat, 30 May 2009 13:52:17 +0200
Subject: Q: finding distance between 2 time's
In-Reply-To: <mailman.923.1243678617.8015.python-list@python.org>
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
Message-ID: <4a211df1$0$25199$ba624c82@nntp02.dk.telia.net>

jkv wrote:
> Hi Martin,
> 
> What i usally do is to convert the two times to seconds since epoch and
> compare the two values in seconds. You can use time.mktime to convert
> localtime to seconds since epoch.

There's no need to convert - simply retrieve the times as absolute times to 
begin with:

   file_age_in_seconds = time.time() - os.path.getmtime(filename)

Only convert to local time for presentation.

- Anders


From martin at hvidberg.net  Sat May 30 08:21:11 2009
From: martin at hvidberg.net (martin at hvidberg.net)
Date: Sat, 30 May 2009 05:21:11 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
	<4a211df1$0$25199$ba624c82@nntp02.dk.telia.net>
Message-ID: <00cd89ce-cab2-42bf-8b91-0b147e6763e1@t21g2000yqi.googlegroups.com>

Thanks both

The first answer is quite instuctive, the other one might be the one
I'll use in the code, it's nicely compact and clear.

So 2x thanks.

:-) Martin


From mail at microcorp.co.za  Sat May 30 08:28:21 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sat, 30 May 2009 14:28:21 +0200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>	<85hbz9f56i.fsf@agentultra.com>	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>	<gvgk9j$bpr$2@lust.ihug.co.nz>	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>	<4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com><mailman.858.1243549462.8015.python-list@python.org>
	<woNTl.14450$y61.392@news-server.bigpond.net.au>
Message-ID: <001901c9e122$255a91c0$0d00a8c0@Hendrik>

"Lie Ryan" <lie.....6 at gmail.com> wrote:
> norseman wrote:
> > Suggestion:
> > Take a look at the top two most used OS you use and learn the default
> > (most often available) text editors that come with them.
> 
> Which means Notepad on Windows?

you could live dangerously and use WordPad...

- Hendrik



From steve at REMOVE-THIS-cybersource.com.au  Sat May 30 10:10:29 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 30 May 2009 14:10:29 GMT
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
Message-ID: <023130ef$0$19421$c3e8da3@news.astraweb.com>

On Sat, 30 May 2009 12:06:55 +0200, jkv wrote:

> I added a few lines to your script, and now it ought to only print files
> newer than 3601 seconds (3600 seconds is one hour). 
...
>     #if file newer than one hour print a line 
>     if time_difference < 3601:

That's a potential off-by-one error. That may print files that are older 
than one hour. Admittedly, they'll be off by less than one second, but if 
you're going to write code, write correct code. The right test is:

    if time_difference <= 3600:

(and you may even want to deal with files that have a *negative* time 
difference, e.g. they were created apparently in the future).

This is particularly necessary if you use time.time() to generate the 
current time, since that returns fractions of a second. But even if you 
don't, it's still the right thing to do: it's defensive programming. 
Rather than assume that all file systems store timestamps accurate only 
to a second, assume that some file system, somewhere, will be accurate to 
fractions of a second, and code accordingly.

That way, no matter what the file system does, your code will still do 
the right thing, and (in this case) it doesn't even cost you anything.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sat May 30 10:35:38 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 30 May 2009 14:35:38 GMT
Subject: Questions about regex
References: <fe9f707f-aaf3-4ca6-859a-5b0c63904fc0@s28g2000vbp.googlegroups.com>
Message-ID: <023136d4$0$19421$c3e8da3@news.astraweb.com>

On Fri, 29 May 2009 11:26:07 -0700, Jared.S.Bauer wrote:

> Hello,
> 
> I'm new to python and I'm having problems with a regular expression. I
> use textmate as my editor and when I run the regex in textmate it works
> fine, but when I run it as part of the script it freezes. Could anyone
> help me figure out why this is happening and how to fix it.


Sure. To figure out why it is happening, the first thing you must do is 
figure out *what* is happening. So first you have to isolate the fault: 
what part of your script is freezing?

I'm going to assume that it is the regex:

> #The two following lines are the ones giving me the problems
> 	text = re.sub("w:(.|\s)*?\n", "", text) 
>       text = re.sub("UnhideWhenUsed=(.|\s)*?\n", "", text)

What happens when you call those two lines in isolation, away from the 
rest of your script? (Obviously you need to initialise a value for text.)
Do they still freeze?

For example, I can do this:

>>> text = "Nobodyw: \n expects the Spanish Inquisition!"
>>> text = re.sub("w:(.|\s)*?\n", "", text)
>>> text = re.sub("UnhideWhenUsed=(.|\s)*?\n", "", text)
>>> text
'Nobody expects the Spanish Inquisition!'

and it doesn't freeze. It works fine.

I suspect that your problem is that the regex hasn't actually *frozen*, 
it's just taking a very, very long time to complete. My guess is that it 
probably has something to do with:

(.|\s)*?

This says, "Match any number of, but as few as possible, of any character 
or whitespace". This will match newlines as well, so the regular 
expression engine will need to do backtracking, which means it will be 
slow for large amounts of data. You want to reduce the amount of 
backtracking that's needed!

I *guess* that what you probably want is:

w:.*?\n

which will match the letter 'w' followed by ':' followed by the shortest 
number of arbitrary characters, including spaces *but not newlines*, 
followed by a newline.

The second regex will probably need a similar change made.

But don't take my word for it: I'm not a regex expert. But isolate the 
fault, identify when it is happening (for all input data, or only for 
large amounts of data?), and then you have a shot at fixing it.



-- 
Steven


From Eric_Dexter at msn.com  Sat May 30 10:42:03 2009
From: Eric_Dexter at msn.com (edexter)
Date: Sat, 30 May 2009 07:42:03 -0700 (PDT)
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com><mailman.858.1243549462.8015.python-list@python.org>
	<woNTl.14450$y61.392@news-server.bigpond.net.au>
	<mailman.925.1243686542.8015.python-list@python.org>
Message-ID: <802b4bfa-40b8-4459-b0c5-d5df5b61c181@n21g2000vba.googlegroups.com>

On May 30, 6:28?am, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:
> "Lie Ryan" <lie...... at gmail.com> wrote:
> > norseman wrote:
> > > Suggestion:
> > > Take a look at the top two most used OS you use and learn the default
> > > (most often available) text editors that come with them.
>
> > Which means Notepad on Windows?
>
> you could live dangerously and use WordPad...
>
> - Hendrik

I will sometimes use word pad but i perfer syntax highlighting.. I
have been tempted to fork out some cash what I would be after is to be
able to define my syntax file, the ability to use code snippits, the
ability to add tools and compilers...  until then I use spe, vim,
emacs, boa constructor, I had a couple of other ones but I probily
won't miss them that much.. The python to c compiler coming of age is
something I am looking foward to and is something I would like to have
supported in my editor (shedskin it is all coming back to me now).


From rtw at freenet.co.uk  Sat May 30 10:45:34 2009
From: rtw at freenet.co.uk (Rob Williscroft)
Date: Sat, 30 May 2009 09:45:34 -0500
Subject: Questions about regex
References: <fe9f707f-aaf3-4ca6-859a-5b0c63904fc0@s28g2000vbp.googlegroups.com>
Message-ID: <Xns9C1BA0C9D8372rtwfreenetREMOVEcouk@216.196.109.145>

 wrote in news:fe9f707f-aaf3-4ca6-859a-5b0c63904fc0
@s28g2000vbp.googlegroups.com in comp.lang.python:


>      text = re.sub('(\<(/?[^\>]+)\>)', "", text)#remove the HTML
> 

Python has a /r/ (raw) string literal type for regex's:

  text = re.sub( r'(\<(/?[^\>]+)\>)', "", text )

In raw strings python doesn't process backslash escape sequences
so r\n' is the 2 char' string '\\n' (a backslash folowed by an 'n').

Without that your pattern  string would need to be writen as:

  '(\\<(/?[^\\>]+)\\>)'

IOW backslashes need to be doubled up or python will process them
before they are passed to re.sub.

Also this seems to be some non-python dialect of regular expression
language, Pythons re's don't need to escape < and >.

http://docs.python.org/library/re.html

The grouping operators, '(' and ')', appear to be unnessasery,
so altogether this 1 line should probably be:

  text = re.sub( r'</?[^>]+>', '', text )

Rob.
-- 
http://www.victim-prime.dsl.pipex.com/


From sven.arduwie at gmail.com  Sat May 30 11:02:29 2009
From: sven.arduwie at gmail.com (Sven Arduwie)
Date: Sat, 30 May 2009 08:02:29 -0700 (PDT)
Subject: Python and Glade: window not showing
Message-ID: <01352f1b-11a6-448b-bbba-2b93794d4e7f@z19g2000vbz.googlegroups.com>

Can anyone help a python newbie and tell me why the simple window I
created in Glade is not showing?

This is the XML generated by Glade 3:
<?xml version="1.0"?>
<interface>
  <requires lib="gtk+" version="2.16"/>
  <!-- interface-naming-policy project-wide -->
  <object class="GtkWindow" id="helloWorld">
    <property name="visible">True</property>
    <signal name="destroy" handler="on_helloWorld_destroy"/>
    <child>
      <placeholder/>
    </child>
  </object>
</interface>

And this is the Python code:
#!/usr/bin/env python

import pygtk
pygtk.require("2.0")
import gtk

class HelloWorld(object):
	def getWindow(self):
		return self.window

	def setWindow(self, window):
		self.window = window

	window = property(getWindow, setWindow)

	def __init__(self):
		builder = gtk.Builder()
		builder.add_from_file("helloWorld.glade")
		builder.connect_signals({"on_helloWorld_destroy" :
self.onHelloWorldDestroy})
		self.window = builder.get_object("helloWorld")
		self.window.show()

	def onHelloWorldDestroy(self):
		pass

I ran this in a terminal on Ubuntu 9.04 like this:
sven at Dell:~$ cd ./gvfs/python\ on\ sven/
sven at Dell:~/gvfs/python on sven$ python ./helloWorld.py
sven at Dell:~/gvfs/python on sven$


From dudekksoft at gmail.com  Sat May 30 11:39:10 2009
From: dudekksoft at gmail.com (dudekksoft at gmail.com)
Date: Sat, 30 May 2009 08:39:10 -0700 (PDT)
Subject: PyQt4 + WebKit
Message-ID: <c6ef05ee-ac66-4d5c-9fd5-6882b39a1daf@t10g2000vbg.googlegroups.com>

Hello,

I need to grab clicked links in QWebView. Everything is fine when I
use linkClicked() signal. LinkDelegationPolicy is set to
DelegateAllLinks and there is a problem. If some site has Javascript
my procedure receives QUrl from linkClicked, next calls:

webView.setUrl(url) #Where "url" is received QUrl

Certainly this method doesn't work. Site loads again (in most cases
it's called http://mywwwsite.net/#). As I use
QWebPage::DelegateExternalLinks it happens the same, because my
procedure grabs links with Javascript. I don't know how to cope with
this problem. Maybe it's possible to set own policy in
QWebPage.LinkDelegationPolicy? Or maybe some other method to grab
protocol, host(if external or not) when user clicks link in webView?

Regards,
Konrad


From abeGong at gmail.com  Sat May 30 12:27:16 2009
From: abeGong at gmail.com (Abe)
Date: Sat, 30 May 2009 09:27:16 -0700 (PDT)
Subject: Compiling and transporting modules/libraries in python
Message-ID: <249dbf4f-ef3e-495e-975e-05d848279d39@u10g2000vbd.googlegroups.com>

Hi all -
  I hope this is a simple question, but I've been running in circles
trying to figure it out myself.  Is there a good way to wrap up a
library (e.g. numpy or matplotlib) so that I can use it on another
machine without actually installing it?

    I use python at a home office and in a university computer lab,
but I don't have the administrative rights to install libraries on the
lab computers.  It would be really nice if there were a way I could
put, say, all of numpy into a file "my_numpy.pyc" and treat it as a
single (large) module.

thanks
-Abe

PS - If the answer somehow involves compileall, could you spell it out
for me?  I haven't been able to figure how to make compileall work for
this.


From aahz at pythoncraft.com  Sat May 30 13:41:52 2009
From: aahz at pythoncraft.com (Aahz)
Date: 30 May 2009 10:41:52 -0700
Subject: How to ask smart questions question
References: <gvgkiv$61t$1@aioe.org>
	<mailman.756.1243349312.8015.python-list@python.org>
	<960af9f3-c445-4d6d-b277-76a123ee4dcd@s28g2000vbp.googlegroups.com>
Message-ID: <gvrr50$ivv$1@panix3.panix.com>

In article <960af9f3-c445-4d6d-b277-76a123ee4dcd at s28g2000vbp.googlegroups.com>,
Carl Banks  <pavlovevidence at gmail.com> wrote:
>On May 26, 7:48=A0am, Gary Herron <gher... at islandtraining.com> wrote:
>>
>> The proper response to a question like this has to be
>> =A0 =A0http://www.catb.org/~esr/faqs/smart-questions.html
>> as anything else is complete guesswork.
>
>Is there a Cliff's Notes version of this?
>
>I may be a cynic but I would think the people who ask bad questions
>are the same sort of people who won't have the patience to sit though
>this behemoth of an essay.

Perhaps linking directly to this would help:

http://www.catb.org/~esr/faqs/smart-questions.html#before

The table of contents contains a good summary for actually asking
questions.  Overall, I'm inclined to agree with people who argue that the
smart questions essay is a good filter; someone unwilling to put in the
work of reading and understanding it is also unwilling to put in the
effort to ask good questions.  I mean, I re-read most of that essay once
every couple of years myself.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From piet at cs.uu.nl  Sat May 30 13:51:25 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 30 May 2009 19:51:25 +0200
Subject: MySQLdb 1.2.2 + python 2.6.2
References: <e3d11715-765f-459d-9605-f323a1844304@h18g2000yqj.googlegroups.com>
Message-ID: <m24ov2eaxu.fsf@cs.uu.nl>

>>>>> monogeo <monogeo at gmail.com> (m) wrote:

>m> Hi all,
>m> Are MySQLdb 1.2.2 and python 2.6.2 compatible? I went to
>m> http://sourceforge.net/project/showfiles.php?group_id=22307, it
>m> doesn't say it is compatible or not.

>m> When trying to install MySQLdb 1.2.2 on my machine which is running
>m> python 2.6.2 and windows XP, I get this error below.

>m> I am able to install MySQLdb 1.2.2 successfully on another machine
>m> which is running python 2.5.4 and windows XP.

>m> Please help if you have any idea.

Try the 1.2.3 release candidate
http://sourceforge.net/project/showfiles.php?group_id=22307&package_id=34790&release_id=672239 
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From benjamin at python.org  Sat May 30 14:04:35 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 30 May 2009 13:04:35 -0500
Subject: [RELEASED] Python 3.1 Release Candidate 1
Message-ID: <1afaf6160905301104w203b5a76u5d9909942f91ecb4@mail.gmail.com>

On behalf of the Python development team, I'm happy to announce the first
release candidate of Python 3.1.

Python 3.1 focuses on the stabilization and optimization of the features and
changes that Python 3.0 introduced.  For example, the new I/O system has been
rewritten in C for speed.  File system APIs that use unicode strings now handle
paths with undecodable bytes in them. Other features include an ordered
dictionary implementation, a condensed syntax for nested with statements, and
support for ttk Tile in Tkinter.  For a more extensive list of changes in 3.1,
see http://doc.python.org/dev/py3k/whatsnew/3.1.html or Misc/NEWS in the Python
distribution.

This is a release candidate, and as such, we do not recommend use in production
environments.  However, please take this opportunity to test the release with
your libraries or applications.  This will hopefully discover bugs before the
final release and allow you to determine how changes in 3.1 might impact you.
If you find things broken or incorrect, please submit a bug report at

     http://bugs.python.org

For more information and downloadable distributions, see the Python 3.1 website:

     http://www.python.org/download/releases/3.1/

See PEP 375 for release schedule details:

     http://www.python.org/dev/peps/pep-0375/



Enjoy,
-- Benjamin

Benjamin Peterson
benjamin at python.org
Release Manager
(on behalf of the entire python-dev team and 3.1's contributors)


From lkennedy5 at gmail.com  Sat May 30 14:15:30 2009
From: lkennedy5 at gmail.com (lsk040365)
Date: Sat, 30 May 2009 11:15:30 -0700 (PDT)
Subject: CRLF when doing os.system("ls -l") while using curses !!!
References: <dc9db609-f79c-4bd6-8777-7743e6628a68@z19g2000vbz.googlegroups.com>
	<m2hbz3edvp.fsf@cs.uu.nl>
Message-ID: <50d4b238-f90f-47df-9646-c6f1e50e640d@e24g2000vbe.googlegroups.com>

On May 29, 6:35?pm, Piet van Oostrum <p... at cs.uu.nl> wrote:
> >>>>> lkenne... at gmail.com (l) wrote:
> >l> Here is the code and as you can see for yourself, the output is not
> >l> coming out on the screen with CRLF like it should. ?How do I fix this?
>
> Don't use curses.
>
> Curses puts the terminal in raw mode (more or less) which doesn't
> translate the newline character into CRLF. If you use curses you are
> supposed to do all output through curses. But the os.system goes
> directly to the screen, outside of curses (because it is another
> process).
> You could catch the output of ls -l with a PIPE and then write the
> output to the curses screen with addstr. But a curses screen has a
> limited length, whereas your ls -l output may be larger so then you must
> implement some form of scrolling.
>
> >l> import curses, os
> >l> screen = curses.initscr()
> >l> os.system("ls -l")
> >l> curses.endwin()
>
> --
> Piet van Oostrum <p... at cs.uu.nl>
> URL:http://pietvanoostrum.com[PGP 8DAE142BE17999C4]
> Private email: p... at vanoostrum.org

Can you provide me with some sort of example possibly--I have been
fighting this for a while and I wouldn't be using curses but I have
designed the program with the extended ascii characters thereby making
a nice UI...?

Thanks in advance,
Lee


From castironpi at gmail.com  Sat May 30 14:20:47 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Sat, 30 May 2009 11:20:47 -0700 (PDT)
Subject: hash and __eq__
Message-ID: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>

I am writing a mapping object, and I want to ask about the details of
__hash__ and __eq__.  IIUC if I understand correctly, the Python
dict's keys' hash codes are looked up first in O( 1 ), then all the
matching hash entries are compared on equality in O( n ).  That is,
the hash code just really narrows down the search.  Am I correct?

P.S.  I always feel like my posts should start like, "A mapping object
am writing I."  Not too many verbs you can do that with in English.
What if I did it?


From sven.arduwie at gmail.com  Sat May 30 14:29:41 2009
From: sven.arduwie at gmail.com (Sven Arduwie)
Date: Sat, 30 May 2009 11:29:41 -0700 (PDT)
Subject: Python and Glade: window not showing
References: <01352f1b-11a6-448b-bbba-2b93794d4e7f@z19g2000vbz.googlegroups.com>
Message-ID: <f5e4561c-3559-414e-a807-d2f70e0c454e@j12g2000vbl.googlegroups.com>

On 30 mei, 17:02, Sven Arduwie <sven.ardu... at gmail.com> wrote:
> Can anyone help a python newbie and tell me why the simple window I
> created in Glade is not showing?
>
> This is the XML generated by Glade 3:
> <?xml version="1.0"?>
> <interface>
> ? <requires lib="gtk+" version="2.16"/>
> ? <!-- interface-naming-policy project-wide -->
> ? <object class="GtkWindow" id="helloWorld">
> ? ? <property name="visible">True</property>
> ? ? <signal name="destroy" handler="on_helloWorld_destroy"/>
> ? ? <child>
> ? ? ? <placeholder/>
> ? ? </child>
> ? </object>
> </interface>
>
> And this is the Python code:
> #!/usr/bin/env python
>
> import pygtk
> pygtk.require("2.0")
> import gtk
>
> class HelloWorld(object):
> ? ? ? ? def getWindow(self):
> ? ? ? ? ? ? ? ? return self.window
>
> ? ? ? ? def setWindow(self, window):
> ? ? ? ? ? ? ? ? self.window = window
>
> ? ? ? ? window = property(getWindow, setWindow)
>
> ? ? ? ? def __init__(self):
> ? ? ? ? ? ? ? ? builder = gtk.Builder()
> ? ? ? ? ? ? ? ? builder.add_from_file("helloWorld.glade")
> ? ? ? ? ? ? ? ? builder.connect_signals({"on_helloWorld_destroy" :
> self.onHelloWorldDestroy})
> ? ? ? ? ? ? ? ? self.window = builder.get_object("helloWorld")
> ? ? ? ? ? ? ? ? self.window.show()
>
> ? ? ? ? def onHelloWorldDestroy(self):
> ? ? ? ? ? ? ? ? pass
>
> I ran this in a terminal on Ubuntu 9.04 like this:
> sven at Dell:~$ cd ./gvfs/python\ on\ sven/
> sven at Dell:~/gvfs/python on sven$ python ./helloWorld.py
> sven at Dell:~/gvfs/python on sven$

Okay I'm mad at myself for forgetting this:

if __name__ == "__main__":
	helloWorld = HelloWorld()
	gtk.main()

When I add that, a new problem arises: the terminal floods with:
  File "./helloWorld.py", line 12, in setWindow
    self.window = window
  File "./helloWorld.py", line 12, in setWindow
    self.window = window
  File "./helloWorld.py", line 12, in setWindow
    self.window = window
ad infinitum


From davea at ieee.org  Sat May 30 15:02:35 2009
From: davea at ieee.org (Dave Angel)
Date: Sat, 30 May 2009 15:02:35 -0400
Subject: Python and Glade: window not showing
In-Reply-To: <f5e4561c-3559-414e-a807-d2f70e0c454e@j12g2000vbl.googlegroups.com>
References: <01352f1b-11a6-448b-bbba-2b93794d4e7f@z19g2000vbz.googlegroups.com>
	<f5e4561c-3559-414e-a807-d2f70e0c454e@j12g2000vbl.googlegroups.com>
Message-ID: <4A2182CB.1000309@ieee.org>

Sven Arduwie wrote:
> On 30 mei, 17:02, Sven Arduwie <sven.ardu... at gmail.com> wrote:
>   
>> Can anyone help a python newbie and tell me why the simple window I
>> created in Glade is not showing?
>>
>> This is the XML generated by Glade 3:
>> <?xml version=.0"?>
>> <interface>
>>   <requires lib=tk+" version="2.16"/>
>>   <!-- interface-naming-policy project-wide -->
>>   <object class=tkWindow" id="helloWorld">
>>     <property name=isible">True</property>
>>     <signal name=estroy" handler="on_helloWorld_destroy"/>
>>     <child>
>>       <placeholder/>
>>     </child>
>>   </object>
>> </interface>
>>
>> And this is the Python code:
>> #!/usr/bin/env python
>>
>> import pygtk
>> pygtk.require("2.0")
>> import gtk
>>
>> class HelloWorld(object):
>>         def getWindow(self):
>>                 return self.window
>>
>>         def setWindow(self, window):
>>                 self.window =indow
>>
>>         window =roperty(getWindow, setWindow)
>>
>>         def __init__(self):
>>                 builder =tk.Builder()
>>                 builder.add_from_file("helloWorld.glade")
>>                 builder.connect_signals({"on_helloWorld_destroy" :
>> self.onHelloWorldDestroy})
>>                 self.window =uilder.get_object("helloWorld")
>>                 self.window.show()
>>
>>         def onHelloWorldDestroy(self):
>>                 pass
>>
>> I ran this in a terminal on Ubuntu 9.04 like this:
>> sven at Dell:~$ cd ./gvfs/python\ on\ sven/
>> sven at Dell:~/gvfs/python on sven$ python ./helloWorld.py
>> sven at Dell:~/gvfs/python on sven$
>>     
>
> Okay I'm mad at myself for forgetting this:
>
> if __name__ ="__main__":
> 	helloWorld =elloWorld()
> 	gtk.main()
>
> When I add that, a new problem arises: the terminal floods with:
>   File "./helloWorld.py", line 12, in setWindow
>     self.window =indow
>   File "./helloWorld.py", line 12, in setWindow
>     self.window =indow
>   File "./helloWorld.py", line 12, in setWindow
>     self.window =indow
> ad infinitum
>
>   
You have infinite recursion because setWindow is defined indirectly in 
terms of itself.  It uses the property 'window', which is defined to use 
setWindow.

The cure for it is simple.  If you want to have a private data 
attribute, use a leading underscore.  Don't call it the same thing that 
the public is going to use.

class HelloWorld(object):
         def getWindow(self):
                 return self._window

         def setWindow(self, window):
                 self._window = window

         window = property(getWindow, setWindow)

         def __init__(self):
                 builder = gtk.Builder()
                 builder.add_from_file("helloWorld.glade")
                 builder.connect_signals({"on_helloWorld_destroy" :
 self.onHelloWorldDestroy})
                 self._window = builder.get_object("helloWorld")
                 self._window.show()

         def onHelloWorldDestroy(self):
                 pass


(untested)



From sven.arduwie at gmail.com  Sat May 30 15:16:47 2009
From: sven.arduwie at gmail.com (Sven Arduwie)
Date: Sat, 30 May 2009 12:16:47 -0700 (PDT)
Subject: Python and Glade: window not showing
References: <01352f1b-11a6-448b-bbba-2b93794d4e7f@z19g2000vbz.googlegroups.com>
	<f5e4561c-3559-414e-a807-d2f70e0c454e@j12g2000vbl.googlegroups.com> 
	<mailman.927.1243710171.8015.python-list@python.org>
Message-ID: <87947830-a16a-4c73-ba09-f963618158a3@t11g2000vbc.googlegroups.com>

On 30 mei, 21:02, Dave Angel <da... at ieee.org> wrote:
> Sven Arduwie wrote:
> > On 30 mei, 17:02, Sven Arduwie <sven.ardu... at gmail.com> wrote:
>
> >> Can anyone help a python newbie and tell me why the simple window I
> >> created in Glade is not showing?
>
> >> This is the XML generated by Glade 3:
> >> <?xml version=.0"?>
> >> <interface>
> >> ? <requires lib=tk+" version="2.16"/>
> >> ? <!-- interface-naming-policy project-wide -->
> >> ? <object class=tkWindow" id="helloWorld">
> >> ? ? <property name=isible">True</property>
> >> ? ? <signal name=estroy" handler="on_helloWorld_destroy"/>
> >> ? ? <child>
> >> ? ? ? <placeholder/>
> >> ? ? </child>
> >> ? </object>
> >> </interface>
>
> >> And this is the Python code:
> >> #!/usr/bin/env python
>
> >> import pygtk
> >> pygtk.require("2.0")
> >> import gtk
>
> >> class HelloWorld(object):
> >> ? ? ? ? def getWindow(self):
> >> ? ? ? ? ? ? ? ? return self.window
>
> >> ? ? ? ? def setWindow(self, window):
> >> ? ? ? ? ? ? ? ? self.window =indow
>
> >> ? ? ? ? window =roperty(getWindow, setWindow)
>
> >> ? ? ? ? def __init__(self):
> >> ? ? ? ? ? ? ? ? builder =tk.Builder()
> >> ? ? ? ? ? ? ? ? builder.add_from_file("helloWorld.glade")
> >> ? ? ? ? ? ? ? ? builder.connect_signals({"on_helloWorld_destroy" :
> >> self.onHelloWorldDestroy})
> >> ? ? ? ? ? ? ? ? self.window =uilder.get_object("helloWorld")
> >> ? ? ? ? ? ? ? ? self.window.show()
>
> >> ? ? ? ? def onHelloWorldDestroy(self):
> >> ? ? ? ? ? ? ? ? pass
>
> >> I ran this in a terminal on Ubuntu 9.04 like this:
> >> sven at Dell:~$ cd ./gvfs/python\ on\ sven/
> >> sven at Dell:~/gvfs/python on sven$ python ./helloWorld.py
> >> sven at Dell:~/gvfs/python on sven$
>
> > Okay I'm mad at myself for forgetting this:
>
> > if __name__ ="__main__":
> > ? ?helloWorld =elloWorld()
> > ? ?gtk.main()
>
> > When I add that, a new problem arises: the terminal floods with:
> > ? File "./helloWorld.py", line 12, in setWindow
> > ? ? self.window =indow
> > ? File "./helloWorld.py", line 12, in setWindow
> > ? ? self.window =indow
> > ? File "./helloWorld.py", line 12, in setWindow
> > ? ? self.window =indow
> > ad infinitum
>
> You have infinite recursion because setWindow is defined indirectly in
> terms of itself. ?It uses the property 'window', which is defined to use
> setWindow.
>
> The cure for it is simple. ?If you want to have a private data
> attribute, use a leading underscore. ?Don't call it the same thing that
> the public is going to use.
>
> class HelloWorld(object):
> ? ? ? ? ?def getWindow(self):
> ? ? ? ? ? ? ? ? ?return self._window
>
> ? ? ? ? ?def setWindow(self, window):
> ? ? ? ? ? ? ? ? ?self._window = window
>
> ? ? ? ? ?window = property(getWindow, setWindow)
>
> ? ? ? ? ?def __init__(self):
> ? ? ? ? ? ? ? ? ?builder = gtk.Builder()
> ? ? ? ? ? ? ? ? ?builder.add_from_file("helloWorld.glade")
> ? ? ? ? ? ? ? ? ?builder.connect_signals({"on_helloWorld_destroy" :
> ?self.onHelloWorldDestroy})
> ? ? ? ? ? ? ? ? ?self._window = builder.get_object("helloWorld")
> ? ? ? ? ? ? ? ? ?self._window.show()
>
> ? ? ? ? ?def onHelloWorldDestroy(self):
> ? ? ? ? ? ? ? ? ?pass
>
> (untested)

That solved the problem, thanks!

I assume that the getWindow and setWindow can be bypassed by using the
_window property directly and that Python has no visibility keywords
like private or protected. Sort of like PHP 4. (Not that I want to
compare Python to anything like that mess, lol ;))


From castironpi at gmail.com  Sat May 30 15:34:57 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Sat, 30 May 2009 12:34:57 -0700 (PDT)
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<mailman.928.1243710680.8015.python-list@python.org>
Message-ID: <c55618e4-b348-4a0e-a455-dd7080c1a740@b9g2000yqm.googlegroups.com>

On May 30, 12:11?pm, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> On Sat, 30 May 2009 11:20:47 -0700 (PDT), Aaron Brady
> <castiro... at gmail.com> declaimed the following in
> gmane.comp.python.general:
>
> > P.S. ?I always feel like my posts should start like, "A mapping object
> > am writing I." ?Not too many verbs you can do that with in English.
> > What if I did it?
>
> ? ? ? ? You turn into a short fuzzy large eared critter in a robe with a
> light-saber?

A fuzzy large eared critter turn I into.

"Ending sentences in prepositions is nonsense up with which I will not
put." -Churchill

I'm mimicking the dict type with an SQL table (something to which I
alluded some time ago).  I'm going to 'select' on the hash code, then
(*THEN*) revive the keys and compare on equality.  The values don't
need to be revived.

P.S.  def revive!


From invert314 at gmail.com  Sat May 30 16:11:40 2009
From: invert314 at gmail.com (Invert)
Date: Sat, 30 May 2009 16:11:40 -0400
Subject: IndexError: tuple index out of range
Message-ID: <4f64bbf10905301311k57be0a73pc445bb2d74f71a2a@mail.gmail.com>

My simple python script gives me an error when I try to execute it.  Here is
the error message:

daniel at ibex:~/Desktop/python$ python3 str_format2Daniel.py
> Traceback (most recent call last):
>   File "str_format2Daniel.py", line 8, in <module>
>     print ("{0} is {1} years old {3} and ".format(name, age, append))
> IndexError: tuple index out of range
> daniel at ibex:~/Desktop/python$
>

Here is my script:

#!/usr/bin/python
> # Filename: str_format2.py
>
> age = 23
> name = 'Daniel'
> append = '6 months'
>
> print ("{0} is {1} years old {3} and ".format(name, age, append))
> print ('{0} will be an elite python programmer in {2}.'.format(name,
> append))


What am I doing wrong?
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From Afro.Systems at gmail.com  Sat May 30 16:16:15 2009
From: Afro.Systems at gmail.com (Tzury Bar Yochay)
Date: Sat, 30 May 2009 13:16:15 -0700 (PDT)
Subject: how to free memory allocated by a function call via ctypes
Message-ID: <4105319d-efdd-4f64-938b-399131981849@m19g2000yqk.googlegroups.com>

Hi,

Suppose I have the following function
char *generateMessage(char *sender, char *reciever, char *message) ;

now in c I would normally do

char *msg = generateMessage(sender, reciever, message);
// do something
free(msg);

My question is how do I free the memory allocated when I call this
function using ctypes
I could not find this in the documentation for python 2.5

thanks


From piet at cs.uu.nl  Sat May 30 16:17:22 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 30 May 2009 22:17:22 +0200
Subject: CRLF when doing os.system("ls -l") while using curses !!!
References: <dc9db609-f79c-4bd6-8777-7743e6628a68@z19g2000vbz.googlegroups.com>
	<m2hbz3edvp.fsf@cs.uu.nl>
	<50d4b238-f90f-47df-9646-c6f1e50e640d@e24g2000vbe.googlegroups.com>
Message-ID: <m2ws7ycpm5.fsf@cs.uu.nl>

>>>>> lsk040365 <lkennedy5 at gmail.com> (l) wrote:

>l> Can you provide me with some sort of example possibly--I have been
>l> fighting this for a while and I wouldn't be using curses but I have
>l> designed the program with the extended ascii characters thereby making
>l> a nice UI...?

Nice UI???? This is so 70's :=)

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-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org

From piet at cs.uu.nl  Sat May 30 16:28:24 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sat, 30 May 2009 22:28:24 +0200
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
Message-ID: <m2skimcp3r.fsf@cs.uu.nl>

>>>>> Aaron Brady <castironpi at gmail.com> (AB) wrote:

>AB> I am writing a mapping object, and I want to ask about the details of
>AB> __hash__ and __eq__.  IIUC if I understand correctly, the Python
>AB> dict's keys' hash codes are looked up first in O( 1 ), then all the
>AB> matching hash entries are compared on equality in O( n ).  That is,
>AB> the hash code just really narrows down the search.  Am I correct?

The O(1) part is correct. The O(n) is incorrect if n as usual is taken
to be the number of keys in the dict. But it is true if n is the number
of keys in the `bucket' that belongs to the hash value. The average
complexity of looking up a key is O(1).

See http://wiki.python.org/moin/DictionaryKeys
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From python at mrabarnett.plus.com  Sat May 30 16:33:00 2009
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 30 May 2009 21:33:00 +0100
Subject: IndexError: tuple index out of range
In-Reply-To: <4f64bbf10905301311k57be0a73pc445bb2d74f71a2a@mail.gmail.com>
References: <4f64bbf10905301311k57be0a73pc445bb2d74f71a2a@mail.gmail.com>
Message-ID: <4A2197FC.1020904@mrabarnett.plus.com>

Invert wrote:
> My simple python script gives me an error when I try to execute it.  
> Here is the error message:
> 
>     daniel at ibex:~/Desktop/python$ python3 str_format2Daniel.py
>     Traceback (most recent call last):
>       File "str_format2Daniel.py", line 8, in <module>
>         print ("{0} is {1} years old {3} and ".format(name, age, append))
>     IndexError: tuple index out of range
>     daniel at ibex:~/Desktop/python$
> 
> 
> Here is my script:
> 
>     #!/usr/bin/python
>     # Filename: str_format2.py
> 
>     age = 23
>     name = 'Daniel'
>     append = '6 months'
> 
>     print ("{0} is {1} years old {3} and ".format(name, age, append))

That should be:

     print ("{0} is {1} years old {2} and ".format(name, age, append))

>     print ('{0} will be an elite python programmer in {2}.'.format(name,
>     append))
> 
> 
> What am I doing wrong?
> 




From benjamin at python.org  Sat May 30 16:49:34 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 30 May 2009 20:49:34 +0000 (UTC)
Subject: how to free memory allocated by a function call via ctypes
References: <4105319d-efdd-4f64-938b-399131981849@m19g2000yqk.googlegroups.com>
Message-ID: <loom.20090530T204841-162@post.gmane.org>

Tzury Bar Yochay <Afro.Systems <at> gmail.com> writes:
> 
> My question is how do I free the memory allocated when I call this
> function using ctypes

The return type of ctypes.create_string_buffer() will call free() when it is
garbage collected.






From arnodel at googlemail.com  Sat May 30 16:55:19 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 30 May 2009 21:55:19 +0100
Subject: decoding keyboard input when using curses
Message-ID: <m2vdni1fbc.fsf@googlemail.com>

Hi all,

I am looking for advice on how to use unicode with curses.  First I will
explain my understanding of how curses deals with keyboard input and how
it differs with what I would like.

The curses module has a window.getch() function to capture keyboard
input.  This function returns an integer which is more or less:

* a byte if the key which was pressed is a printable character (e.g. a,
  F, &);

* an integer > 255 if it is a special key, e.g. if you press KEY_UP it
  returns 259.

As far as I know, curses is totally unicode unaware, so if the key
pressed is printable but not ASCII, the getch() function will return one
or more bytes depending on the encoding in the terminal.

E.g. given utf-8 encoding, if I press the key '?' on my keyboard (which
encoded as '\xc3\xa9' in utf-8), I will need two calls to getch() to get
this: the first one will return 0xC3 and the second one 0xA9.

Instead of getting a stream of bytes and special keycodes (with value >
255) from getch(), what I want is a stream of *unicode characters* and
special keycodes.

So, still assuming utf-8 encoding in the terminal, if I type:

    T?[KEY_UP]?a

iterating call to the getch() function will give me this sequence of
integers:

    84, 195, 169, 259,   195, 167, 97
    T-  ?-------  KEY_UP ?-------  a-

But what I want to get this stream instead:

    u'T', u'?', 259, u'?', u'a'


I can pipe the stream of output from getch() directly through an
instance of codecs.getreader('utf-8') because getch() sometimes returns
the integer values of the 'special keys'.

Now I will present to you the solution I have come up with so far.  I am
really unsure whether it is a good way to solve this problem as both
unicode and curses still feel quite mysterious to me.  What I would
appreciate is some advice on how to do it better - or someone to point
out that I have a gross misunderstanding of what is going on!

This has been tested in Python 2.5

-------------------- uctest.py ------------------------------
# -*- coding:utf-8 -*-

import codecs
import curses

# This gives the return codes given by curses.window.getch() when
# "T?[KEY_UP]?a" is typed in a terminal with utf-8 encoding:

codes = map(ord, "T?") + [curses.KEY_UP]  + map(ord, "?a")


# This class defines a file-like object from a curses window 'win'
# whose read() function will return the next byte (as a character)
# given by win.getch() if it's a byte or return the empty string and
# set the code attribute to the value of win.getch().

# It is not used in this test, The Stream class below is used
# instead.

class CursesStream(object):
    def __init__(self, win):
        self.getch = self.win.getch
    def read(self):
        c = self.getch()
        if c == -1:
            self.code = None
            return ''
        elif c > 255:
            self.code = c
            return ''
        else:
            return chr(c)

# This class simulates CursesStream above with a predefined list of
# keycodes to return - handy for testing.

class Stream(object):
    def __init__(self, codes):
        self.codes = iter(codes)
    def read(self):
        try:
            c = self.codes.next()
        except StopIteration:
            self.code = None
            return ''
        if c > 255:
            self.code = c
            return ''
        else:
            return chr(c)

def getkeys(stream, encoding):
    '''Given a CursesStream object and an encoding, yield the decoded
    unicode characters and special keycodes that curses sends'''
    read = codecs.getreader(encoding)(stream).read
    while True:
        c = read()
        if c:
            yield c
        elif stream.code is None:
            return
        else:
            yield stream.code


# Test getkeys with

for c in getkeys(Stream(codes), 'utf-8'):
    if isinstance(c, unicode):
        print 'Char\t', c
    else:
        print 'Code\t', c

-------------------- running uctest.py ------------------------------

marigold:junk arno$ python uctest.py 
Char	T
Char	?
Code	259
Char	?
Char	a

Thanks if you have read this far!

-- 
Arnaud


From arnodel at googlemail.com  Sat May 30 16:58:33 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 30 May 2009 21:58:33 +0100
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl>
Message-ID: <m2r5y61f5y.fsf@googlemail.com>

Piet van Oostrum <piet at cs.uu.nl> writes:

>>>>>> Aaron Brady <castironpi at gmail.com> (AB) wrote:
>
>>AB> I am writing a mapping object, and I want to ask about the details of
>>AB> __hash__ and __eq__.  IIUC if I understand correctly, the Python
>>AB> dict's keys' hash codes are looked up first in O( 1 ), then all the
>>AB> matching hash entries are compared on equality in O( n ).  That is,
>>AB> the hash code just really narrows down the search.  Am I correct?
>
> The O(1) part is correct. The O(n) is incorrect if n as usual is taken
> to be the number of keys in the dict. But it is true if n is the number
> of keys in the `bucket' that belongs to the hash value. The average
> complexity of looking up a key is O(1).

As all the keys could be in the same bucket, O(n) seems correct to me
(with n the total number of keys).

-- 
Arnaud


From arnodel at googlemail.com  Sat May 30 17:02:01 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sat, 30 May 2009 22:02:01 +0100
Subject: decoding keyboard input when using curses
References: <m2vdni1fbc.fsf@googlemail.com>
Message-ID: <m2my8u1f06.fsf@googlemail.com>

Arnaud Delobelle <arnodel at googlemail.com> writes:
[...]
> I can pipe the stream of output from getch() directly through an
    ^^^ I mean *can't*

> instance of codecs.getreader('utf-8') because getch() sometimes returns
> the integer values of the 'special keys'.
[...]

I reread my post 3 times before sending it, honest!

-- 
Arnaud


From aahz at pythoncraft.com  Sat May 30 17:18:32 2009
From: aahz at pythoncraft.com (Aahz)
Date: 30 May 2009 14:18:32 -0700
Subject: scripting and uploading in Python
References: <3c1f0711-8da8-4610-bf8e-679eff0facf9@21g2000vbk.googlegroups.com>
Message-ID: <gvs7r8$qt$1@panix3.panix.com>

In article <3c1f0711-8da8-4610-bf8e-679eff0facf9 at 21g2000vbk.googlegroups.com>,
Mark Tarver  <dr.mtarver at ukonline.co.uk> wrote:
>
>Generally I'd like to bring myself up to speed on scripting in
>Python.   Any good reads - dead tree or otherwise?

Assuming you have any programming experience, start with the Python
tutorial:

http://docs.python.org/tutorial/index.html
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From aahz at pythoncraft.com  Sat May 30 17:22:57 2009
From: aahz at pythoncraft.com (Aahz)
Date: 30 May 2009 14:22:57 -0700
Subject: multiprocessing / forking memory usage
References: <mailman.771.1243360355.8015.python-list@python.org>
Message-ID: <gvs83h$5k8$1@panix3.panix.com>

In article <mailman.771.1243360355.8015.python-list at python.org>,
Randall Smith  <randall at tnr.cc> wrote:
>
>I'm trying to get a grasp on how memory usage is affected when forking 
>as the multiprocessing module does.  I've got a program with a parent 
>process using wx and other memory intensive modules. It spawns child 
>processes (by forking) that should be very lean (no wx required, etc). 
>Based on inspection using "ps v" and psutil, the memory usage (rss) is 
>much higher than I would expect for the subprocess.

One option if you're concerned about memory usage is to os.exec() another
program after forking, which will overlay the current process.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From dineshbvadhia at hotmail.com  Sat May 30 17:34:49 2009
From: dineshbvadhia at hotmail.com (dineshv)
Date: Sat, 30 May 2009 14:34:49 -0700 (PDT)
Subject: Python 2.6 for Windows 64-bit AMD
Message-ID: <e7b03ce3-1de4-46e4-995b-34f250f5e513@m17g2000vbi.googlegroups.com>

I upgraded from Python 2.5.4 to Python 2.6.2 under the Windows 64-bit
AMD version, but no external libraries (eg. pyparsing and Numpy 1.3)
work.  I noticed a few odd things:

i.  pyparsing could not find an entry for Python 2.6.2 in the Wondows
Registry
ii. Python 2.6.2 only allows per-machine installation instead of per-
user and per-machine.

Can anyone shed any light on what's up with this build of Python
2.6.2?

Dinesh


From jkv at unixcluster.dk  Sat May 30 17:37:50 2009
From: jkv at unixcluster.dk (jkv)
Date: Sat, 30 May 2009 23:37:50 +0200
Subject: Q: finding distance between 2 time's
In-Reply-To: <00cd89ce-cab2-42bf-8b91-0b147e6763e1@t21g2000yqi.googlegroups.com>
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>	<mailman.923.1243678617.8015.python-list@python.org>	<4a211df1$0$25199$ba624c82@nntp02.dk.telia.net>
	<00cd89ce-cab2-42bf-8b91-0b147e6763e1@t21g2000yqi.googlegroups.com>
Message-ID: <4A21A72E.5000607@unixcluster.dk>

martin at hvidberg.net wrote:
> Thanks both
>
> The first answer is quite instuctive, the other one might be the one
> I'll use in t
I didn't receive the other answer, could you please forward it to me?
> So 2x thanks.
You are welcome.

I took another look at your code, and you can compress it all to a if
"oneliner":
(and thanks to Steven for the <= reminder)

        if os.path.isfile(x):
            nSize = os.path.getsize(x)
            #if oneliner
            if time.mktime(time.localtime()) -
time.mktime(time.localtime(os.path.getmtime(x))) <= 3600:
              print ('HT fil -> %s %d @ %s') % (x, nSize, time.asctime)



From tjreedy at udel.edu  Sat May 30 18:29:10 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 30 May 2009 18:29:10 -0400
Subject: hash and __eq__
In-Reply-To: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
Message-ID: <gvsbvm$f9q$1@ger.gmane.org>

Aaron Brady wrote:
> I am writing a mapping object, and I want to ask about the details of
> __hash__ and __eq__.  IIUC if I understand correctly, the Python
> dict's keys' hash codes are looked up first in O( 1 ), then all the
> matching hash entries are compared on equality in O( n ).  That is,
> the hash code just really narrows down the search.  Am I correct?

Yes.  Even if your mapping object did a linear O(n) search with the hash 
value, only testing for equality after finding an equal hash value would 
be faster.  Your own mapping object can do whatever you want it to do 
internally, as long as it provides the appropriate interface.  You 
could, for instance, make a map that allowed unhashable lists, 
(unfrozen) sets, and dicts as heys by using len() as a surrogate for hash().

tjr



From tjreedy at udel.edu  Sat May 30 18:35:52 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 30 May 2009 18:35:52 -0400
Subject: IndexError: tuple index out of range
In-Reply-To: <4A2197FC.1020904@mrabarnett.plus.com>
References: <4f64bbf10905301311k57be0a73pc445bb2d74f71a2a@mail.gmail.com>
	<4A2197FC.1020904@mrabarnett.plus.com>
Message-ID: <gvscc7$gb0$1@ger.gmane.org>

MRAB wrote:
> Invert wrote:
>> My simple python script gives me an error when I try to execute it.  
>> Here is the error message:
>>
>>     daniel at ibex:~/Desktop/python$ python3 str_format2Daniel.py
>>     Traceback (most recent call last):
>>       File "str_format2Daniel.py", line 8, in <module>
>>         print ("{0} is {1} years old {3} and ".format(name, age, append))
>>     IndexError: tuple index out of range
>>     daniel at ibex:~/Desktop/python$
>>
>>
>> Here is my script:
>>
>>     #!/usr/bin/python
>>     # Filename: str_format2.py
>>
>>     age = 23
>>     name = 'Daniel'
>>     append = '6 months'
>>
>>     print ("{0} is {1} years old {3} and ".format(name, age, append))
> 
> That should be:
> 
>     print ("{0} is {1} years old {2} and ".format(name, age, append))

Actually
print ("{0} is {1} years old and {2}".format(name, age, append))

> 
>>     print ('{0} will be an elite python programmer in {2}.'.format(name,
>>     append))

And the latter should replace 2 with 1.

>> What am I doing wrong?

Using position indexes that are too large.  In Py3.1, .format will 
auto-number fields, so the print statements could be

print("{} is {} years old and {}".format(name, age, append))
print ('{} will be an elite python programmer in {}.'.format(name, append))

Terry Jan Reedy




From robert.kern at gmail.com  Sat May 30 18:40:16 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 30 May 2009 17:40:16 -0500
Subject: hash and __eq__
In-Reply-To: <gvsbvm$f9q$1@ger.gmane.org>
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<gvsbvm$f9q$1@ger.gmane.org>
Message-ID: <gvsckh$gvo$1@ger.gmane.org>

On 2009-05-30 17:29, Terry Reedy wrote:
> Aaron Brady wrote:
>> I am writing a mapping object, and I want to ask about the details of
>> __hash__ and __eq__. IIUC if I understand correctly, the Python
>> dict's keys' hash codes are looked up first in O( 1 ), then all the
>> matching hash entries are compared on equality in O( n ). That is,
>> the hash code just really narrows down the search. Am I correct?
>
> Yes. Even if your mapping object did a linear O(n) search with the hash
> value, only testing for equality after finding an equal hash value would
> be faster. Your own mapping object can do whatever you want it to do
> internally, as long as it provides the appropriate interface. You could,
> for instance, make a map that allowed unhashable lists, (unfrozen) sets,
> and dicts as heys by using len() as a surrogate for hash().

Only as long as you don't modify the length of those objects serving as keys in 
the meantime. But if you're careful about that, knock yourself out.

The important property to maintain is that if two keys compare equal to each 
other, then their hashes should equal each other. The reverse does not have to 
be true.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From martin at v.loewis.de  Sat May 30 18:41:26 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 31 May 2009 00:41:26 +0200
Subject: Python 2.6 for Windows 64-bit AMD
In-Reply-To: <e7b03ce3-1de4-46e4-995b-34f250f5e513@m17g2000vbi.googlegroups.com>
References: <e7b03ce3-1de4-46e4-995b-34f250f5e513@m17g2000vbi.googlegroups.com>
Message-ID: <4a21b616$0$20532$9b622d9e@news.freenet.de>

> Can anyone shed any light on what's up with this build of Python
> 2.6.2?

You probably tried to install the 32-bit version of PyParsing;
this cannot work with the 64-bit version of Python. You either
need to obtain a 64-bit version of pyparsing, or install the
32-bit version of Python.

HTH,
Martin


From tjreedy at udel.edu  Sat May 30 18:42:15 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 30 May 2009 18:42:15 -0400
Subject: Python 2.6 for Windows 64-bit AMD
In-Reply-To: <e7b03ce3-1de4-46e4-995b-34f250f5e513@m17g2000vbi.googlegroups.com>
References: <e7b03ce3-1de4-46e4-995b-34f250f5e513@m17g2000vbi.googlegroups.com>
Message-ID: <gvsco6$h9b$1@ger.gmane.org>

dineshv wrote:
> I upgraded from Python 2.5.4 to Python 2.6.2 under the Windows 64-bit
> AMD version, but no external libraries (eg. pyparsing and Numpy 1.3)
> work.  I noticed a few odd things:
> 
> i.  pyparsing could not find an entry for Python 2.6.2 in the Wondows
> Registry

I suspect that you did not make 2.6 the default installation, so it did 
not make the registry entry pyparsing was looking for.  If pyparsing has 
any compiled C, you need a binary compiled and linked for 2.6.

> ii. Python 2.6.2 only allows per-machine installation instead of per-
> user and per-machine.

I would not be surprised if per-user installation was dropped because of 
problems, especially with Vista.

> Can anyone shed any light on what's up with this build of Python
> 2.6.2?

Probably built by M.L.Loewis, who may chime in.

tjr




From piet at cs.uu.nl  Sat May 30 18:48:38 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Sun, 31 May 2009 00:48:38 +0200
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl> <m2r5y61f5y.fsf@googlemail.com>
Message-ID: <m2octacim1.fsf@cs.uu.nl>

>>>>> Arnaud Delobelle <arnodel at googlemail.com> (AD) wrote:

>AD> Piet van Oostrum <piet at cs.uu.nl> writes:
>>>>>>>> Aaron Brady <castironpi at gmail.com> (AB) wrote:
>>> 
>AB> I am writing a mapping object, and I want to ask about the details of
>AB> __hash__ and __eq__.  IIUC if I understand correctly, the Python
>AB> dict's keys' hash codes are looked up first in O( 1 ), then all the
>AB> matching hash entries are compared on equality in O( n ).  That is,
>AB> the hash code just really narrows down the search.  Am I correct?
>>> 
>>> The O(1) part is correct. The O(n) is incorrect if n as usual is taken
>>> to be the number of keys in the dict. But it is true if n is the number
>>> of keys in the `bucket' that belongs to the hash value. The average
>>> complexity of looking up a key is O(1).

>AD> As all the keys could be in the same bucket, O(n) seems correct to me
>AD> (with n the total number of keys).

For worst case only (mainly with a badly designed hash function). 
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From seattlehanks at yahoo.com  Sat May 30 19:01:06 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sat, 30 May 2009 16:01:06 -0700 (PDT)
Subject: Metaclass mystery
Message-ID: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>

I am experimenting with metaclasses, trying to figure out how things
are put together. At the moment I am baffled by the output of the
following code:

************************************
"""
Output is:

instance of metaclass MyMeta being created
(<class '__main__.MyMeta'>, <class '__main__.MyMeta'>)
instance of metaclass MyNewMeta being created
instance of metaclass MyMeta being created   <<<< Why this?
(<class '__main__.MyMeta'>, <class '__main__.MyNewMeta'>)

"""

class MyMeta(type):
    def __new__(meta, classname, bases, classDict):
        print 'instance of metaclass MyMeta being created'
        return type.__new__(meta, classname, bases, classDict)

class MyNewMeta(type):
    def __new__(meta, classname, bases, classDict):
        print 'instance of metaclass MyNewMeta being created'
        return type(classname, bases, classDict)

"""
Notice that a metaclass can be a factory function:
def f(classname, bases, classDict):
    return type(classname, bases, classDict)

class MyClass(object):
    __metaclass__ = f
"""

class MyClass(object):
    __metaclass__ = MyMeta

print (MyClass.__class__, MyClass.__metaclass__)

class MySubClass(MyClass):
    __metaclass__ = MyNewMeta

print (MySubClass.__class__, MySubClass.__metaclass__)
************************************
Honestly, I don't know why this line:
instance of metaclass MyMeta being created   <<<< Why this?
is being output when the MySubClass class object is instantiated.
MyNewMeta's __new__ method simply instantiates type directly (which I
know shouldn't be done, but I'm just experimenting and trying to
understand the code's output.)

I would really appreciate some ideas.


From gabriel at opensuse.org  Sat May 30 19:16:10 2009
From: gabriel at opensuse.org (Gabriel)
Date: Sat, 30 May 2009 20:16:10 -0300
Subject: how to find the last decorator of a chain
Message-ID: <4A21BE3A.1090608@opensuse.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Hi,

I have something like this:

@render(format="a")
@render(format="b")
@....
def view(format, data):
  return data

Each render will do something with 'data' if format match, and nothing
if not.

But if there is no more renders to eval, the last one is the default,
and must run even if the format doesn't match.

In my understanding this equivalent to:

render('a',
 render('b',
  view(***)))

Is there any way to know, in this case, that 'a' is the 'default' format?

PS: the number of renders could be 1 or more.

- --
Kind regards.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.9 (GNU/Linux)

iEYEAREIAAYFAkohvjoACgkQNHr4BkRe3pJZQgCgqxL7Qq7/vqDQMLkGQs5emWgH
nbMAn2vzY0xGjG2xhOkxAf8hmERc8R5r
=wWbB
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From sjmachin at lexicon.net  Sat May 30 19:36:09 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 30 May 2009 16:36:09 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
Message-ID: <fa295d10-693d-4277-990a-6d4baff520b3@c9g2000yqm.googlegroups.com>

On May 30, 7:33?pm, mar... at hvidberg.net wrote:
> I made this little script (below) to look througt a dir to see if
> there are any files newer than .e.g. 1 hour.
> I have the loop through the dir working and can retreive file time as
> well as present time.
> both time variables are in the format returned by time.localtime()
>
> My question:
> How do I find the difference between such two time variables, to
> calculate the 'age' of the file?

http://en.wikipedia.org/wiki/Subtraction

This technique in well worth learning, as it can be applied in many
real-world situations, sometimes not even requiring a computer. For
example:

The letter was postmarked on the 18th of May; it was delivered on the
29th of May; how many days was it in transit? You give a $10 note for
an article priced at $6.35; how much change should you get?

HTH,
John


From benjamin at python.org  Sat May 30 19:45:53 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 30 May 2009 23:45:53 +0000 (UTC)
Subject: how to find the last decorator of a chain
References: <4A21BE3A.1090608@opensuse.org>
Message-ID: <loom.20090530T234452-982@post.gmane.org>

Gabriel <gabriel <at> opensuse.org> writes:

> In my understanding this equivalent to:
> 
> render('a',
>  render('b',
>   view(***)))
> 
> Is there any way to know, in this case, that 'a' is the 'default' format?

You could set an attribute on the function indicating the default.







From david at boddie.org.uk  Sat May 30 20:32:25 2009
From: david at boddie.org.uk (David Boddie)
Date: Sun, 31 May 2009 02:32:25 +0200
Subject: PyQt4 + WebKit
References: <c6ef05ee-ac66-4d5c-9fd5-6882b39a1daf@t10g2000vbg.googlegroups.com>
Message-ID: <gvsj6p$7na$1@get-news01.get.basefarm.net>

On Saturday 30 May 2009 17:39, dudekksoft at gmail.com wrote:

> I need to grab clicked links in QWebView. Everything is fine when I
> use linkClicked() signal. LinkDelegationPolicy is set to
> DelegateAllLinks and there is a problem. If some site has Javascript
> my procedure receives QUrl from linkClicked, next calls:
> 
> webView.setUrl(url) #Where "url" is received QUrl
> 
> Certainly this method doesn't work. Site loads again (in most cases
> it's called http://mywwwsite.net/#).

OK, so if I understand correctly, you don't know how to handle these
special links if you use a delegation policy, and you would prefer it
if they were handled by WebKit.

> As I use 
> QWebPage::DelegateExternalLinks it happens the same, because my
> procedure grabs links with Javascript. I don't know how to cope with
> this problem. Maybe it's possible to set own policy in
> QWebPage.LinkDelegationPolicy? Or maybe some other method to grab
> protocol, host(if external or not) when user clicks link in webView?

So, you only want to handle certain links, and pass on to WebKit those which
you can't handle? Is that correct?

David


From seattlehanks at yahoo.com  Sat May 30 20:32:33 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sat, 30 May 2009 17:32:33 -0700 (PDT)
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
Message-ID: <af1d0d42-0d62-4857-9e5c-6b18b7d79891@x3g2000yqa.googlegroups.com>

On May 30, 4:01?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> I am experimenting with metaclasses, trying to figure out how things
> are put together. At the moment I am baffled by the output of the
> following code:
>
> ************************************
> """
> Output is:
>
> instance of metaclass MyMeta being created
> (<class '__main__.MyMeta'>, <class '__main__.MyMeta'>)
> instance of metaclass MyNewMeta being created
> instance of metaclass MyMeta being created ? <<<< Why this?
> (<class '__main__.MyMeta'>, <class '__main__.MyNewMeta'>)
>
> """
>
> class MyMeta(type):
> ? ? def __new__(meta, classname, bases, classDict):
> ? ? ? ? print 'instance of metaclass MyMeta being created'
> ? ? ? ? return type.__new__(meta, classname, bases, classDict)
>
> class MyNewMeta(type):
> ? ? def __new__(meta, classname, bases, classDict):
> ? ? ? ? print 'instance of metaclass MyNewMeta being created'
> ? ? ? ? return type(classname, bases, classDict)
>
> """
> Notice that a metaclass can be a factory function:
> def f(classname, bases, classDict):
> ? ? return type(classname, bases, classDict)
>
> class MyClass(object):
> ? ? __metaclass__ = f
> """
>
> class MyClass(object):
> ? ? __metaclass__ = MyMeta
>
> print (MyClass.__class__, MyClass.__metaclass__)
>
> class MySubClass(MyClass):
> ? ? __metaclass__ = MyNewMeta
>
> print (MySubClass.__class__, MySubClass.__metaclass__)
> ************************************
> Honestly, I don't know why this line:
> instance of metaclass MyMeta being created ? <<<< Why this?
> is being output when the MySubClass class object is instantiated.
> MyNewMeta's __new__ method simply instantiates type directly (which I
> know shouldn't be done, but I'm just experimenting and trying to
> understand the code's output.)
>
> I would really appreciate some ideas.

This is my working theory:

return type(classname, bases, classDict), in MyNewMeta.__new__(),
actually calls type.__new__(type, classname, bases, classDict). I
think the magic happens in this method call. This method must look at
bases and notice that MySubClass extends MyClass, and that MyClass'
type is MyMeta, so instead of instantiating a 'type' object it decides
to instantiate a 'MyMeta' object, which accounts for the output.

Seriously, metaclasses are making my brain hurt. How do people like
Michele Simionato and David Mertz figure these things out? Does it all
come to looking at the C source code for the CPython interpreter?

Brain hurts, seriously.


From sjmachin at lexicon.net  Sat May 30 20:49:39 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 30 May 2009 17:49:39 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
	<4a211df1$0$25199$ba624c82@nntp02.dk.telia.net> 
	<00cd89ce-cab2-42bf-8b91-0b147e6763e1@t21g2000yqi.googlegroups.com> 
	<mailman.934.1243719478.8015.python-list@python.org>
Message-ID: <627c674d-a357-4c8e-98dc-127d9f87346d@g37g2000yqn.googlegroups.com>

On May 31, 7:37?am, jkv <j... at unixcluster.dk> wrote:
> mar... at hvidberg.net wrote:
> > Thanks both
>
> > The first answer is quite instuctive, the other one might be the one
> > I'll use in t
>
> I didn't receive the other answer, could you please forward it to me?> So 2x thanks.
>
> You are welcome.
>
> I took another look at your code, and you can compress it all to a if
> "oneliner":
> (and thanks to Steven for the <= reminder)
>
> ? ? ? ? if os.path.isfile(x):
> ? ? ? ? ? ? nSize = os.path.getsize(x)
> ? ? ? ? ? ? #if oneliner
> ? ? ? ? ? ? if time.mktime(time.localtime()) -
> time.mktime(time.localtime(os.path.getmtime(x))) <= 3600:
> ? ? ? ? ? ? ? print ('HT fil -> %s %d @ %s') % (x, nSize, time.asctime)

There is no virtue in onelinedness if the code is unclear and/or
incorrect.

Problems:
(1) Converting UTC time to local time and back again??

  > import time
  You are in a maze of twisty little functions, all alike.

So it can pay to do things a step at a time, and leave a note of your
intentions at each step.

(2) Consider grabbing the "current time" once instead of each for each
file

(3) asctime ... you are missing (an_argument)

import os, time, sys

def buildList(directory):
    listing = os.listdir(directory)
    now_utc_secs = time.time()
    for x in os.listdir(directory):
        x = os.path.join(directory, x)
        if os.path.isdir(x):
            print ('dir -> %s') % x
        elif os.path.isfile(x):
            mtime_utc_secs = os.path.getmtime(x)
            if now_utc_secs - mtime_utc_secs <= 3600.0:
                nSize = os.path.getsize(x)
                mtime_local_tuple = time.localtime(mtime_utc_secs)
                mtime_local_text = time.asctime(mtime_local_tuple)
                print ('fil -> %s %d @ %s') % (x, nSize,
mtime_local_text)

tstN = time.localtime()
print tstN
print "Time now: %s" % time.asctime(tstN)
buildList(sys.argv[1])

HTH,
John


From pavlovevidence at gmail.com  Sat May 30 21:15:30 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 30 May 2009 18:15:30 -0700 (PDT)
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<af1d0d42-0d62-4857-9e5c-6b18b7d79891@x3g2000yqa.googlegroups.com>
Message-ID: <cf7d562c-778c-4f06-a2ce-a58561dc0dfb@h2g2000yqg.googlegroups.com>

On May 30, 5:32?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> On May 30, 4:01?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
>
>
> > I am experimenting with metaclasses, trying to figure out how things
> > are put together. At the moment I am baffled by the output of the
> > following code:
>
> > ************************************
> > """
> > Output is:
>
> > instance of metaclass MyMeta being created
> > (<class '__main__.MyMeta'>, <class '__main__.MyMeta'>)
> > instance of metaclass MyNewMeta being created
> > instance of metaclass MyMeta being created ? <<<< Why this?
> > (<class '__main__.MyMeta'>, <class '__main__.MyNewMeta'>)
>
> > """
>
> > class MyMeta(type):
> > ? ? def __new__(meta, classname, bases, classDict):
> > ? ? ? ? print 'instance of metaclass MyMeta being created'
> > ? ? ? ? return type.__new__(meta, classname, bases, classDict)
>
> > class MyNewMeta(type):
> > ? ? def __new__(meta, classname, bases, classDict):
> > ? ? ? ? print 'instance of metaclass MyNewMeta being created'
> > ? ? ? ? return type(classname, bases, classDict)
>
> > """
> > Notice that a metaclass can be a factory function:
> > def f(classname, bases, classDict):
> > ? ? return type(classname, bases, classDict)
>
> > class MyClass(object):
> > ? ? __metaclass__ = f
> > """
>
> > class MyClass(object):
> > ? ? __metaclass__ = MyMeta
>
> > print (MyClass.__class__, MyClass.__metaclass__)
>
> > class MySubClass(MyClass):
> > ? ? __metaclass__ = MyNewMeta
>
> > print (MySubClass.__class__, MySubClass.__metaclass__)
> > ************************************
> > Honestly, I don't know why this line:
> > instance of metaclass MyMeta being created ? <<<< Why this?
> > is being output when the MySubClass class object is instantiated.
> > MyNewMeta's __new__ method simply instantiates type directly (which I
> > know shouldn't be done, but I'm just experimenting and trying to
> > understand the code's output.)
>
> > I would really appreciate some ideas.
>
> This is my working theory:
>
> return type(classname, bases, classDict), in MyNewMeta.__new__(),
> actually calls type.__new__(type, classname, bases, classDict). I
> think the magic happens in this method call. This method must look at
> bases and notice that MySubClass extends MyClass, and that MyClass'
> type is MyMeta, so instead of instantiating a 'type' object it decides
> to instantiate a 'MyMeta' object, which accounts for the output.

That's correct.  A type's metaclass has to be a not-necessarily proper
superclass of the all the bases' metaclasses.

Whenever possible type() will figure the most derived metaclass of all
the bases and use that as the metaclass, but sometimes it can't be
done.  Consider the following:


class AMeta(type):
    pass

class A(object):
    __metaclass__ = AMeta

class BMeta(type):
    pass

class B(object):
    __metaclass__ = BMeta

class C(A,B):
    pass  # this will raise exception

class CMeta(AMeta,BMeta):
    pass

class C(A,B):
    __metaclass__ = CMeta # this will work ok



> Seriously, metaclasses are making my brain hurt. How do people like
> Michele Simionato and David Mertz figure these things out? Does it all
> come to looking at the C source code for the CPython interpreter?
>
> Brain hurts, seriously.

I actually did rely on looking at the C source.  There's a surprising
amount of checking involving metaclass, layout, special methods, and
so on that is involved when creating a new type.


Carl Banks


From seattlehanks at yahoo.com  Sat May 30 21:37:13 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sat, 30 May 2009 18:37:13 -0700 (PDT)
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<af1d0d42-0d62-4857-9e5c-6b18b7d79891@x3g2000yqa.googlegroups.com> 
	<cf7d562c-778c-4f06-a2ce-a58561dc0dfb@h2g2000yqg.googlegroups.com>
Message-ID: <fdef7f4c-e7f2-4afa-aa72-6b1550d11c3d@f19g2000yqh.googlegroups.com>

On May 30, 6:15?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 30, 5:32?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
>
>
> > On May 30, 4:01?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
> > > I am experimenting with metaclasses, trying to figure out how things
> > > are put together. At the moment I am baffled by the output of the
> > > following code:
>
> > > ************************************
> > > """
> > > Output is:
>
> > > instance of metaclass MyMeta being created
> > > (<class '__main__.MyMeta'>, <class '__main__.MyMeta'>)
> > > instance of metaclass MyNewMeta being created
> > > instance of metaclass MyMeta being created ? <<<< Why this?
> > > (<class '__main__.MyMeta'>, <class '__main__.MyNewMeta'>)
>
> > > """
>
> > > class MyMeta(type):
> > > ? ? def __new__(meta, classname, bases, classDict):
> > > ? ? ? ? print 'instance of metaclass MyMeta being created'
> > > ? ? ? ? return type.__new__(meta, classname, bases, classDict)
>
> > > class MyNewMeta(type):
> > > ? ? def __new__(meta, classname, bases, classDict):
> > > ? ? ? ? print 'instance of metaclass MyNewMeta being created'
> > > ? ? ? ? return type(classname, bases, classDict)
>
> > > """
> > > Notice that a metaclass can be a factory function:
> > > def f(classname, bases, classDict):
> > > ? ? return type(classname, bases, classDict)
>
> > > class MyClass(object):
> > > ? ? __metaclass__ = f
> > > """
>
> > > class MyClass(object):
> > > ? ? __metaclass__ = MyMeta
>
> > > print (MyClass.__class__, MyClass.__metaclass__)
>
> > > class MySubClass(MyClass):
> > > ? ? __metaclass__ = MyNewMeta
>
> > > print (MySubClass.__class__, MySubClass.__metaclass__)
> > > ************************************
> > > Honestly, I don't know why this line:
> > > instance of metaclass MyMeta being created ? <<<< Why this?
> > > is being output when the MySubClass class object is instantiated.
> > > MyNewMeta's __new__ method simply instantiates type directly (which I
> > > know shouldn't be done, but I'm just experimenting and trying to
> > > understand the code's output.)
>
> > > I would really appreciate some ideas.
>
> > This is my working theory:
>
> > return type(classname, bases, classDict), in MyNewMeta.__new__(),
> > actually calls type.__new__(type, classname, bases, classDict). I
> > think the magic happens in this method call. This method must look at
> > bases and notice that MySubClass extends MyClass, and that MyClass'
> > type is MyMeta, so instead of instantiating a 'type' object it decides
> > to instantiate a 'MyMeta' object, which accounts for the output.
>
> That's correct. ?A type's metaclass has to be a not-necessarily proper
> superclass of the all the bases' metaclasses.
>
> Whenever possible type() will figure the most derived metaclass of all
> the bases and use that as the metaclass, but sometimes it can't be
> done. ?Consider the following:
>
> class AMeta(type):
> ? ? pass
>
> class A(object):
> ? ? __metaclass__ = AMeta
>
> class BMeta(type):
> ? ? pass
>
> class B(object):
> ? ? __metaclass__ = BMeta
>
> class C(A,B):
> ? ? pass ?# this will raise exception
>
> class CMeta(AMeta,BMeta):
> ? ? pass
>
> class C(A,B):
> ? ? __metaclass__ = CMeta # this will work ok
>
> > Seriously, metaclasses are making my brain hurt. How do people like
> > Michele Simionato and David Mertz figure these things out? Does it all
> > come to looking at the C source code for the CPython interpreter?
>
> > Brain hurts, seriously.
>
> I actually did rely on looking at the C source. ?There's a surprising
> amount of checking involving metaclass, layout, special methods, and
> so on that is involved when creating a new type.
>
> Carl Banks

Thanks a lot, Carl. It's funny that you would post that example, as
just 15 minutes ago I wrote almost the exact same code in my testing:

class XMeta(type):
    pass

class YMeta(type):
    pass

class X(object):
    __metaclass__ = XMeta

class Y(object):
    __metaclass__ = YMeta

"""
This causes an error, since there is no leafmost metaclass in the set
{XMeta, YMeta}:

class Z(X, Y):
    pass
"""

"""
The way to solve this is to create a common derived metaclass and use
that
one for class z:
"""

class ZMeta(XMeta, YMeta):
    pass

class Z(X, Y):
    __metaclass__ = ZMeta

Looking at the C code sounds like a daunting task, but I might take a
plunge and give it a try, since it seems that guessing via
experimental results is not the most optimal way to go about it.

Thank you again.


From nkamado at gmail.com  Sat May 30 21:42:46 2009
From: nkamado at gmail.com (=?ISO-2022-JP?B?GyRCM3lFWjUtTkkbKEI=?=)
Date: Sun, 31 May 2009 10:42:46 +0900
Subject: Release PyInstaller exe installer using distutils for windows.
Message-ID: <4A21E096.1060405@gmail.com>

I created pyInstaller exe installer using distutils only for windows and
upload onto the following URL.
It makes you to build windows executable file with setup.py's setup
function.
Setup function is unmounted function on original pyInstaller package,
and this installer enables UPX exe archive functions as default.

http://moco.sakura.ne.jp/wp-content/uploads/2009/05/pyinstaller-13win32.exe

If you want to use this package,
Please write following code on setup.py.

from pyInstaller import *
setup('testre.py',onefile=True,name='test')


Thank you.

// kr2: nkamado at gmail.com



From ldo at geek-central.gen.new_zealand  Sat May 30 22:11:34 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 31 May 2009 14:11:34 +1200
Subject: What text editor is everyone using for Python
References: <d6d05d39-98e7-4c28-b201-4b2445732ab4@v35g2000pro.googlegroups.com>
	<85hbz9f56i.fsf@agentultra.com>
	<35e44e77-fdd1-470a-b5ad-f5ffd187f1af@g22g2000pra.googlegroups.com>
	<gvgk9j$bpr$2@lust.ihug.co.nz>
	<9a346808-6e06-44de-b6b3-f3720286ff13@l12g2000yqo.googlegroups.com>
	<4a211274-f190-47e3-8166-5b3536d678e7@i28g2000prd.googlegroups.com>
	<mailman.858.1243549462.8015.python-list@python.org>
	<woNTl.14450$y61.392@news-server.bigpond.net.au>
Message-ID: <gvsp0m$fn1$5@lust.ihug.co.nz>

In message <woNTl.14450$y61.392 at news-server.bigpond.net.au>, Lie Ryan wrote:

> norseman wrote:
>
>> Suggestion:
>> Take a look at the top two most used OS you use and learn the default
>> (most often available) text editors that come with them.
> 
> Which means Notepad on Windows?

Or you could take a Linux preinstallation on a Live CD/DVD or USB stick. 
There's no Windows system so brain-dead it can't be fixed with a simple 
ctrl-alt-del. :)



From ldo at geek-central.gen.new_zealand  Sat May 30 22:15:12 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 31 May 2009 14:15:12 +1200
Subject: DB-API execute params, am I missing something?
References: <4A1BD6A9.8090809@arimaz.com>
	<mailman.766.1243354300.8015.python-list@python.org>
	<gvj1bj$og1$3@lust.ihug.co.nz> <784h2cF1kem0kU1@mid.uni-berlin.de>
	<gvkoep$oii$3@lust.ihug.co.nz>
	<0dcfcb4a-8844-420b-b2e2-c8e68419774d@p6g2000pre.googlegroups.com>
	<gvq2h9$sos$3@lust.ihug.co.nz>
	<55520c08-5b02-4231-b0f3-74eadecd6fd7@g1g2000yqh.googlegroups.com>
Message-ID: <gvsp7g$fn1$6@lust.ihug.co.nz>

In message <55520c08-5b02-4231-
b0f3-74eadecd6fd7 at g1g2000yqh.googlegroups.com>, John Machin wrote:

> ... suggest a better way.

<http://codecodex.com/wiki/index.php?title=Useful_MySQL_Routines#Quoting>



From Jebel.Star at gmail.com  Sat May 30 22:28:23 2009
From: Jebel.Star at gmail.com (Jebel)
Date: Sat, 30 May 2009 19:28:23 -0700 (PDT)
Subject: (windows) How to get information as string from a GreenHills project?
Message-ID: <a84b8eba-5082-4d9a-ab75-38d1466a2eee@s12g2000yqi.googlegroups.com>

I use python to start a GreenHills project in command line. And the
GreenHills project create a string which is include the information
that needed to be analyzed. How Can I return this string from
GreenHills project to python?

Thanks a lot.



From goldwamh at slu.edu  Sun May 31 01:27:26 2009
From: goldwamh at slu.edu (Michael H. Goldwasser)
Date: Sun, 31 May 2009 00:27:26 -0500
Subject: Challenge supporting custom deepcopy with inheritance
Message-ID: <18978.5438.755496.633709@Michael-Goldwassers-Computer.local>


I've been playing around recently with customizing the deepcopy
semantics within an inheritance hierarchy, and run across the
following hurdle.

Assume that class B inherits from class A, and that class A has
legitimately customized its deepcopy semantics (but in a way that is
not known to class B).  If we want a deepcopy of B to be defined so
that relevant state inherited from A is copied as would be done for
class A, and with B able to control how to deepcopy the extra state
that it introduces.  I cannot immediately find a general way to
properly implement the deepcopy of B.

To make the discussion tangible, I include an outrageously artificial
example in the code fragment below.  In this code, class A implements
__deepcopy__ to intentionally create a clone that has a reversed
version of a list instance.  The beginning of the main test
demonstrates that an instance of A can successfully be cloned with this
semantics.  But the attempt to deepcopy an instance of B fails (the
current failure is because B has not implemented __deepcopy__ and the
inherited version of A.__deepcopy__ assumes the wrong constructor
signature).

The question is how class B should defined so that its instances can
"inherit" this deepcopy semantic.  Ideally, I'd like to find a recipe
for class B that works regardless of how A accomplishes its semantics.
That is, I can find ways to rewrite A to be more supportive of B's
goal, but I'd like to know if there is a general solution that could
be used if the author of B doesn't have control over A's
implementation.

Here are some initial thoughts:

 * I'm only concerned with single inheritance (thankfully)

 * If A had relied on use of __getstate__ and __setstate__ to affect
   the desired change, then the inheritance works as desired.  But I
   have an application where I want to leave the default pickling
   behavior alone, and only to change what happens with clones.

 * If we did not use inheritance, but instead had a class B that had
   an A instance in its state, this is easy. We would call deepcopy
   on the A instance to get an acceptable copy of that instance for
   the new B.  But in the example below, we insist on B being a
   subtype of A.

 * If A.__deepcopy__ had started
            dup = A(self.__aTag)
   rather than
            dup = self.__class__(self.__aTag)

   then the following perverse approach for B.__deepcopy__ succeeds:

        def __deepcopy__(self, memo={}):
            tempBTag = self.__bTag
            tempBList = self.__bList
            del self.__bTag     # hide these attributes to avoid risk
            del self.__bList    # that they affect A.__deepcopy__
            dupA = A.__deepcopy__(self, memo)
            self.__bTag = tempBTag
            self.__bList = tempBList
            dup = B.__new__(B)
            memo[id(self)] = dup
            dup.__dict__ = dupA.__dict__
            dup.__bTag = copy.deepcopy(self.__bTag, memo)
            dup.__bList = copy.deepcopy(self.__bList, memo)
            return dup

    but this again presumes that we have some control over the
    strategy employed by class A, it relies on the fact that
    A.__deepcopy__ succeeded when the first parameter was actually an
    instance of class B rather than class A, and it seems like a
    perverse strategy on the whole, even if it does succeed on this
    example.  Also, there could be a flaw n that dupA may recursively
    have included a reference back to that instance, yet we'd need
    such a reference to be to dup not dupA in the end.

I'm hoping that I've just missed a cleaner way to do this.
I welcome any comments, discussion, or suggestions.

With regard,
Michael

-----------------------------------------------------------
import copy

class A(object):
    def __init__(self, aTag):
        self.__aTag = aTag
        self.__aList = []

    def addA(self, val):
        self.__aList.append(val)

    def __repr__(self):
        return (
            "aTag: " + self.__aTag +
            "\naList ("+str(id(self.__aList))+"): " + repr(self.__aList)
            )

    def __deepcopy__(self, memo={}):
        dup = self.__class__(self.__aTag)
        memo[id(self)] = dup
        dup.__aList = copy.deepcopy(self.__aList, memo)
        dup.__aList.reverse()
        return dup

class B(A):
    def __init__(self, aTag, bTag):
        A.__init__(self, aTag)
        self.__bTag = bTag
        self.__bList = []

    def addB(self, val):
        self.__bList.append(val)

    def __repr__(self):
        return (
            A.__repr__(self) +
            "\nbTag: " + self.__bTag +
            "\nbList ("+str(id(self.__bList))+"): " + repr(self.__bList)
            )

    #  How can B support a deepcopy that provides deepcopy of bTag and
    #  bList while getting the semantics of A's deepcopy for
    #  attributes defined by A?


if __name__ == '__main__':
    print "Test of class A\n==============="
    foo = A('alice')
    foo.addA(1)
    foo.addA(2)

    bar = copy.deepcopy(foo)

    print "\nOriginal Foo:"
    print foo
    print "\nOriginal (deepcopy) Bar:"
    print bar

    bar.addA(0)

    print "\n(mutated) Bar:"
    print bar
    print "Original Foo:"
    print foo

    print "Test of class B\n==============="
    foo = B('alice', 'bob')
    foo.addA(1)
    foo.addA(2)
    foo.addB('hello')
    foo.addB('goodbye')

    bar = copy.deepcopy(foo)     #  crashes

    print "\nOriginal Foo:"
    print foo
    print "\nOriginal (deepcopy) Bar:"
    print bar

    bar.addA(0)
    bar.addB('adios')

    print "\n(mutated) Bar:"
    print bar
    print "Original Foo:"
    print foo
-----------------------------------------------------------


From cameron.pulsford at gmail.com  Sun May 31 01:58:15 2009
From: cameron.pulsford at gmail.com (Cameron Pulsford)
Date: Sun, 31 May 2009 01:58:15 -0400
Subject: Have a variable column length in printf
Message-ID: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>

Hello all, I'm trying to pretty print a list, so I am doing something like
print '%3d' % integer

only I would like that 3 to be a variable, instead of hardcoded. Is this
possible, or are there any other ways to accomplish this? Thanks!
-------------- next part --------------
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From cjns1989 at gmail.com  Sun May 31 02:22:20 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Sun, 31 May 2009 02:22:20 -0400
Subject: decoding keyboard input when using curses
In-Reply-To: <m2vdni1fbc.fsf@googlemail.com>
References: <m2vdni1fbc.fsf@googlemail.com>
Message-ID: <20090531062220.GA2451@turki.gavron.org>

On Sat, May 30, 2009 at 04:55:19PM EDT, Arnaud Delobelle wrote:

> Hi all,

Disclaimer: I am not familiar with the curses python implementation and
I'm neither an ncurses nor a "unicode" expert by a long shot.

:-)

> I am looking for advice on how to use unicode with curses.  First I will
> explain my understanding of how curses deals with keyboard input and how
> it differs with what I would like.
> 
> The curses module has a window.getch() function to capture keyboard
> input.  This function returns an integer which is more or less:
> 
> * a byte if the key which was pressed is a printable character (e.g. a,
>   F, &);
> 
> * an integer > 255 if it is a special key, e.g. if you press KEY_UP it
>   returns 259.

The getch(3NCURSES) function returns an integer. Provide it's large
enough to accomodate the highest possible value, the actual size in
bytes of the integer should be irrelevant.

> As far as I know, curses is totally unicode unaware, 

My impression is that rather than "unicode unaware", it is "unicode
transparent" - or (nitpicking) "UTF8 transparent" - since I'm not sure
other flavors of unicode are supported.

> so if the key pressed is printable but not ASCII, 

.. nitpicking again, but ASCII is a 7-bit encoding: 0-127.

> the getch() function will return one or more bytes depending on the
> encoding in the terminal.

I don't know about the python implementation, but my guess is that it
should closely follow the underlying ncurses API - so the above is
basically correct, although it's not a question of the number of bytes
but rather the returned range of integers - if your locale is en.US then
that should be 0-255.. if it is en_US.utf8 the range is considerably
larger.

> E.g. given utf-8 encoding, if I press the key '?' on my keyboard (which
> encoded as '\xc3\xa9' in utf-8), I will need two calls to getch() to get
> this: the first one will return 0xC3 and the second one 0xA9.

No. A single call to getch() will grab your " ?" and return 0xc3a9,
decimal 50089.

> Instead of getting a stream of bytes and special keycodes (with value >
> 255) from getch(), what I want is a stream of *unicode characters* and
> special keycodes.

This is what getch(3NCURSES) does: it returns the integer value of one
"unicode character".

Likewise, I would assume that looping over the python equivalent of
getch() will not return a stream of bytes but rather a "stream" of
integers that map one to one to the "unicode characters" that were
entered at the terminal.

Note: I am only familiar with languages such as English, Spanish,
French, etc. where only one terminal cell is used for each glyph. My
understanding is that things get somewhat more complicated with
languages that require so-called "wide characters" - two terminal cells
per character, but that's a different issue.

> So, still assuming utf-8 encoding in the terminal, if I type:
> 
>     T?[KEY_UP]?a
> 
> iterating call to the getch() function will give me this sequence of
> integers:
> 
>     84, 195, 169, 259,   195, 167, 97
>     T-  ?-------  KEY_UP ?-------  a-
> 
> But what I want to get this stream instead:
> 
>     u'T', u'?', 259, u'?', u'a'

No, for the above, getch() will return:

     84, 50089, 259, 50087, 97

.. which is "functionally" equivalent to:

     u'T', u'?', 259, u'?', u'a'

[..]

So shouldn't this issue boil down to just a matter of casting the
integers to the "u" data type?

This short snippet may help clarify the above:

-----------------------------------------------------------------------
#include <locale.h>
#include <ncurses.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

int unichar;

int main(int argc, char *argv[])
{
  setlocale(LC_ALL, "en_US.UTF.8");        /* make sure UTF8       */
  initscr();                               /* start curses mode    */
  raw();
  keypad(stdscr, TRUE);                    /* pass special keys    */
  unichar = getch();                       /* read terminal        */

  mvprintw(24, 0, "Key pressed is = %4x ", unichar);

  refresh();
  getch();                                 /* wait                 */
  endwin();                                /* leave curses mode    */
  return 0;
}
-----------------------------------------------------------------------

Hopefully you have access to a C compiler:

$ gcc -lncurses uni00.c -o uni00

Hope this helps... Whatever the case, please keep me posted.

CJ


From arnodel at googlemail.com  Sun May 31 02:24:09 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 31 May 2009 07:24:09 +0100
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl> <m2r5y61f5y.fsf@googlemail.com>
	<m2octacim1.fsf@cs.uu.nl>
Message-ID: <m2iqjh23jq.fsf@googlemail.com>

Piet van Oostrum <piet at cs.uu.nl> writes:

>>>>>> Arnaud Delobelle <arnodel at googlemail.com> (AD) wrote:
>
>>AD> Piet van Oostrum <piet at cs.uu.nl> writes:
>>>>>>>>> Aaron Brady <castironpi at gmail.com> (AB) wrote:
>>>> 
>>AB> I am writing a mapping object, and I want to ask about the details of
>>AB> __hash__ and __eq__.  IIUC if I understand correctly, the Python
>>AB> dict's keys' hash codes are looked up first in O( 1 ), then all the
>>AB> matching hash entries are compared on equality in O( n ).  That is,
>>AB> the hash code just really narrows down the search.  Am I correct?
>>>> 
>>>> The O(1) part is correct. The O(n) is incorrect if n as usual is taken
>>>> to be the number of keys in the dict. But it is true if n is the number
>>>> of keys in the `bucket' that belongs to the hash value. The average
>>>> complexity of looking up a key is O(1).
>
>>AD> As all the keys could be in the same bucket, O(n) seems correct to me
>>AD> (with n the total number of keys).
>
> For worst case only (mainly with a badly designed hash function). 

... or a cleverly designed data set!

AFAIK, 'complexity' means 'worst case complexity' unless otherwise
stated.

-- 
Arnaud


From emile at fenx.com  Sun May 31 03:03:21 2009
From: emile at fenx.com (Emile van Sebille)
Date: Sun, 31 May 2009 00:03:21 -0700
Subject: Have a variable column length in printf
In-Reply-To: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
References: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
Message-ID: <gvta7s$35b$1@ger.gmane.org>

On 5/30/2009 10:58 PM Cameron Pulsford said...
> Hello all, I'm trying to pretty print a list, so I am doing something like
> 
> print '%3d' % integer
> 
> only I would like that 3 to be a variable, instead of hardcoded. Is this 
> possible, or are there any other ways to accomplish this? Thanks!
> 

 >>> integer = 12
 >>> for lenvar in (4,5,6,7):
...     print ("%%%sd" % lenvar) % integer
...
   12
    12
     12
      12
 >>>


Emile



From smukh at cognobytes.com  Sun May 31 03:06:48 2009
From: smukh at cognobytes.com (Sumitava Mukherjee)
Date: Sun, 31 May 2009 00:06:48 -0700 (PDT)
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<c9566044-6e50-42ca-aa02-9ff63206c601@g22g2000pra.googlegroups.com> 
	<m2zlcz1ykl.fsf@googlemail.com>
	<slrnh1sr7v.fef.apardon@rcpc42.vub.ac.be>
Message-ID: <e131cf51-516c-4d1d-bfe3-5c060af73d2d@h28g2000yqd.googlegroups.com>

On May 28, 3:52?pm, Antoon Pardon <apar... at forel.vub.ac.be> wrote:
> Op 2009-05-26, Arnaud Delobelle schreef <arno... at googlemail.com>:
>
>
>
> > Sumitava Mukherjee <sm... at cognobytes.com> writes:
>
> >> On May 26, 11:39?pm, Sumitava Mukherjee <sm... at cognobytes.com> wrote:
> >>> Hi all,
> >>> I need to randomly sample from a list where all choices have weights
> >>> attached to them. The probability of them being choosen is dependent
> >>> on the weights.
> >>> If say Sample list of choices are [A,B,C,D,E] and weights of the same
> >>> are [0.895,0.567,0.765,0.890,0.60] when I draw (say 2) samples then I
> >>> want the likeliness of them being chosen be in the order : D>A>C>E>B
>
> > You mean A > D > C > E > B
>
> >>> In short I mean if prob of a H is .9 and probability of T be 0.1 then
> >>> if I draw 10 samples, 9 should be H and 1 should be T.
>
> >>> I coudn't find a function in the module random that does so.
> >>> Please can someone guide me how the above could be implemented [either
> >>> through some function which exists and I don't know or pointers to
> >>> some code snippets which does so]?
>
> >>>>>> [Oh, I forgot to mention. I am looking for sampling without replacement.]
>
> > If you do sampling without replacement, you need to know the exact
> > number of each of A, B, C, D, E in the sample, not just their relative
> > frequency.
>
> As far as I understand, you are given the exact number of each. It is one.
> The numbers given are not relative frequencies of appearance but weights
> to be attributed for picking them.
>
> --
> Antoon Pardon

Yes, the numbers are weights attributed for picking them.


From smukh at cognobytes.com  Sun May 31 03:08:44 2009
From: smukh at cognobytes.com (Sumitava Mukherjee)
Date: Sun, 31 May 2009 00:08:44 -0700 (PDT)
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<uIadnZ8appu3y4DXnZ2dnUVZ_radnZ2d@pdx.net>
Message-ID: <a380edb3-77f6-4e0d-bccd-2bff92b7cb1b@k2g2000yql.googlegroups.com>

On May 27, 8:08?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> Sumitava Mukherjee wrote:
> > I need to randomly sample from a list where all choices have weights
> > attached to them. The probability of them being choosen is dependent
> > on the weights.
>
> I am not sure why everybody is normalizing by dividing the weights.
> This isa possibility (I had fun writing it).
>
> def sample_without_replacement(choices, weights):
> ? ? ?'''Yield elements sampled w/o replacement by weighting'''
> ? ? ?if len(weights) != len(choices):
> ? ? ? ? ?raise ValueError('%d choices, but %d weights?' % (
> ? ? ? ? ? ? ?len(choices), len(weights)))
> ? ? ?if min(weights) < 0:
> ? ? ? ? ?raise ValueError('Negative weights?: %s' % (
> ? ? ? ? ? ? ? ? ? ? ?[(i, w) for i, w in enumerate(weights) if w < 0]))
>
> ? ? ?# look at only non-zero probabilities
> ? ? ?combined = [(w, v) for w, v in zip(weights, choices) if w > 0]
>
> ? ? ?# Go from highest probability down to reduce expected traversal
> ? ? ?combined.sort(key=operator.itemgetter(0), reverse=True)
>
> ? ? ?total = sum(w for w, v in combined) # sum(weights) also works
> ? ? ?while combined:
> ? ? ? ? ?spot = sample = random.random() * total
> ? ? ? ? ?for n, (weight, choice) in enumerate(combined):
> ? ? ? ? ? ? ?spot -= weight
> ? ? ? ? ? ? ?if spot <= 0:
> ? ? ? ? ? ? ? ? ?break
> ? ? ? ? ?else:
> ? ? ? ? ? ? ?# n, (weight, choice) = 0, combined[0] # Highest probability
> ? ? ? ? ? ? ?raise ValueError('%f left after choosing %f/%f?: %s' % (
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?spot, sample, total, combined))
> ? ? ? ? ?yield choice
> ? ? ? ? ?total -= weight
> ? ? ? ? ?if weight > total * 256: # arbitrary choice for recalculation
> ? ? ? ? ? ? ?# precision affected, rebuild
> ? ? ? ? ? ? ?total = sum(w for w, v in combined)
> ? ? ? ? ?del combined[n]
> ? ? ?raise ValueError('Samplng more than %d without replacement?' % (
> ? ? ? ? ? ? ? ? ? ? ? ?sum(1 for w in weights if w > 0)))
>
> for n in range(10):
> ? ? ?gen = sample_without_replacement('abcdef', [32,16,8,4,2,1])
> ? ? ?print gen.next(), gen.next(), gen.next()
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

Among all the help (all of which I really appreciate), I found your
solution closest to what I was expecting. Thanks a lot Scott.


From arnodel at googlemail.com  Sun May 31 03:19:09 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 31 May 2009 08:19:09 +0100
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<af1d0d42-0d62-4857-9e5c-6b18b7d79891@x3g2000yqa.googlegroups.com>
	<cf7d562c-778c-4f06-a2ce-a58561dc0dfb@h2g2000yqg.googlegroups.com>
	<fdef7f4c-e7f2-4afa-aa72-6b1550d11c3d@f19g2000yqh.googlegroups.com>
Message-ID: <m2eiu52102.fsf@googlemail.com>

LittleGrasshopper <seattlehanks at yahoo.com> writes:

> On May 30, 6:15?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>> On May 30, 5:32?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>>
>>
>>
>> > On May 30, 4:01?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>>
>> > > I am experimenting with metaclasses, trying to figure out how things
>> > > are put together.

Have you read Guido's 'Unifying types and classes in Python 2.2' [1]?  I
read it a long time ago but I remember it being very enlightening.

[1] http://www.python.org/download/releases/2.2.3/descrintro/

-- 
Arnaud


From gherron at islandtraining.com  Sun May 31 03:21:37 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Sun, 31 May 2009 00:21:37 -0700
Subject: Have a variable column length in printf
In-Reply-To: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
References: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
Message-ID: <4A223001.5010809@islandtraining.com>

Cameron Pulsford wrote:
> Hello all, I'm trying to pretty print a list, so I am doing something 
> like
>
> print '%3d' % integer
>
> only I would like that 3 to be a variable, instead of hardcoded. Is 
> this possible, or are there any other ways to accomplish this? Thanks!

Use a '*' instead of fixed width, and then supply the actual width as a 
separate parameter:

 >>> print '%*d' % (5,123)
  123

Gary Herron




From steve at REMOVE-THIS-cybersource.com.au  Sun May 31 03:34:39 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 31 May 2009 07:34:39 GMT
Subject: Have a variable column length in printf
References: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
	<mailman.946.1243754501.8015.python-list@python.org>
Message-ID: <003e0d92$0$9723$c3e8da3@news.astraweb.com>

Apologies for breaking threading, the original post to this thread is not 
on my newserver.


Cameron Pulsford wrote:

> Hello all, I'm trying to pretty print a list, so I am doing something
> like
>
> print '%3d' % integer


Instead of re-inventing the wheel, have you looked at the pretty-print 
module? import pprint may do what you want.

If you still need your own custom pretty-print function, then there are a 
couple of ways to accomplish what you ask:

>> only I would like that 3 to be a variable, instead of hardcoded. Is
>> this possible, or are there any other ways to accomplish this?

As others have said, you can use '*' instead of the width. Another 
alternative, for even more flexibility, is to construct the format string 
programmatically:


>>> fmt = '%%0%dd' % 7
>>> print fmt % 3
0000003



-- 
Steven


From michele.petrazz at REMOTEME_unipex.it  Sun May 31 03:51:53 2009
From: michele.petrazz at REMOTEME_unipex.it (Michele Petrazzo)
Date: Sun, 31 May 2009 09:51:53 +0200
Subject: try except inside exec
In-Reply-To: <mailman.899.1243615820.8015.python-list@python.org>
References: <gvor0g$679$1@nnrp-beta.newsland.it>	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>	<gvp0gn$9qh$1@nnrp-beta.newsland.it>
	<mailman.899.1243615820.8015.python-list@python.org>
Message-ID: <gvtcup$mkc$1@nnrp-beta.newsland.it>

Emile van Sebille wrote:
> Write the string out to a .py file and import it?
> 

I don't think that it's possible. I want to create an env that are
accessible only from that peace of code and not from the code that
"execute" the third-party one.

> Emile
> 

Michele


From michele.petrazz at REMOTEME_unipex.it  Sun May 31 03:54:27 2009
From: michele.petrazz at REMOTEME_unipex.it (Michele Petrazzo)
Date: Sun, 31 May 2009 09:54:27 +0200
Subject: try except inside exec
In-Reply-To: <mailman.900.1243616869.8015.python-list@python.org>
References: <gvor0g$679$1@nnrp-beta.newsland.it>	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>	<gvp0gn$9qh$1@nnrp-beta.newsland.it>
	<mailman.900.1243616869.8015.python-list@python.org>
Message-ID: <gvtd3i$mkc$2@nnrp-beta.newsland.it>

David Stanek wrote:
> Is the thirdparty function the entire STR or just the a_funct part?
> 

Just the a_funct. Only for try and for see if it's possible to catch all
the (possible) exception(s), I add the "try/except" clause that include
the a_funct external code.

Michele


From ldo at geek-central.gen.new_zealand  Sun May 31 04:00:22 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 31 May 2009 20:00:22 +1200
Subject: How to reuse TCP listening socket immediately after it was
	connected at least once?
References: <mailman.651.1243154739.8015.python-list@python.org>
	<gvb8fn$7gm$1@lust.ihug.co.nz>
	<roy-3C4DED.09214724052009@news.panix.com>
	<gvlppt$hk0$1@news.lysator.liu.se> <gvmudo$25d$2@lust.ihug.co.nz>
	<gvqh4p$obn$1@news.lysator.liu.se>
Message-ID: <gvtdem$rk7$2@lust.ihug.co.nz>

In message <gvqh4p$obn$1 at news.lysator.liu.se>, Thomas Bellman wrote:

> We weren't exactly keen on rebooting the machine, but it was the
> fastest way of getting out of that situation that we could figure
> out.  How *should* we have dealt with it in your opinion?

Remember, the timed_wait timeout is there for a reason, and trying to defeat 
it could reduce the reliability of your application--that's why cutting 
corners is a bad idea.

If you want to minimize the effect of the timeout, then just use different 
ports, and have the clients find them via DNS SRV records.



From steve at REMOVE-THIS-cybersource.com.au  Sun May 31 04:04:30 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 31 May 2009 08:04:30 GMT
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl> <m2r5y61f5y.fsf@googlemail.com>
	<m2octacim1.fsf@cs.uu.nl> <m2iqjh23jq.fsf@googlemail.com>
Message-ID: <003e1491$0$9723$c3e8da3@news.astraweb.com>

On Sun, 31 May 2009 07:24:09 +0100, Arnaud Delobelle wrote:

> AFAIK, 'complexity' means 'worst case complexity' unless otherwise
> stated.

No, it means "average or typical case" unless otherwise specified. 
Consult almost any comp sci text book and you'll see hash tables with 
chaining (like Python dicts) described as O(1) rather than O(N), 
Quicksort as O(N log N) instead of O(N**2), and similar. If the default 
was "worst case unless otherwise specified", then Quicksort would be 
called "Slower than Bubblesort Sort".

(Both are O(N**2), but Quicksort does more work.)

Here's a quote on-line:

"You should be clear about which cases big-oh notation describes. By 
default it usually refers to the average case, using random data. 
However, the characteristics for best, worst, and average cases can be 
very different..."

http://leepoint.net/notes-java/algorithms/big-oh/bigoh.html


It is simply misleading to describe dicts as O(N) without the 
qualification "if the data is chosen maliciously, or otherwise by an 
incredible fluke". And even if it isn't, Piet explicitly said he was 
talking about the average behaviour, not worst.



-- 
Steven


From arnodel at googlemail.com  Sun May 31 04:05:20 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 31 May 2009 09:05:20 +0100
Subject: decoding keyboard input when using curses
References: <m2vdni1fbc.fsf@googlemail.com>
	<mailman.944.1243750942.8015.python-list@python.org>
Message-ID: <m2ab4t1yv3.fsf@googlemail.com>

Chris Jones <cjns1989 at gmail.com> writes:

Hi Chris, thanks for your detailed reply.

> On Sat, May 30, 2009 at 04:55:19PM EDT, Arnaud Delobelle wrote:
>
>> Hi all,
>
> Disclaimer: I am not familiar with the curses python implementation and
> I'm neither an ncurses nor a "unicode" expert by a long shot.
>
> :-)
>
>> I am looking for advice on how to use unicode with curses.  First I will
>> explain my understanding of how curses deals with keyboard input and how
>> it differs with what I would like.
>> 
>> The curses module has a window.getch() function to capture keyboard
>> input.  This function returns an integer which is more or less:
>> 
>> * a byte if the key which was pressed is a printable character (e.g. a,
>>   F, &);
>> 
>> * an integer > 255 if it is a special key, e.g. if you press KEY_UP it
>>   returns 259.
>
> The getch(3NCURSES) function returns an integer. Provide it's large
> enough to accomodate the highest possible value, the actual size in
> bytes of the integer should be irrelevant.

Sorry I was somehow mixing up what happens in general and what happens
with utf-8 (probably because I have only done test with utf-8), where
the number of bytes used to encode a character varies.

>> As far as I know, curses is totally unicode unaware, 
>
> My impression is that rather than "unicode unaware", it is "unicode
> transparent" - or (nitpicking) "UTF8 transparent" - since I'm not sure
> other flavors of unicode are supported.

>> so if the key pressed is printable but not ASCII, 
>
> .. nitpicking again, but ASCII is a 7-bit encoding: 0-127.
>
>> the getch() function will return one or more bytes depending on the
>> encoding in the terminal.
>
> I don't know about the python implementation, but my guess is that it
> should closely follow the underlying ncurses API - so the above is
> basically correct, although it's not a question of the number of bytes
> but rather the returned range of integers - if your locale is en.US then
> that should be 0-255.. if it is en_US.utf8 the range is considerably
> larger.

In my tests, my locale is en_GB.utf8 and the python getch() function
does return a number of bytes - see below.

>> E.g. given utf-8 encoding, if I press the key '?' on my keyboard (which
>> encoded as '\xc3\xa9' in utf-8), I will need two calls to getch() to get
>> this: the first one will return 0xC3 and the second one 0xA9.
>
> No. A single call to getch() will grab your " ?" and return 0xc3a9,
> decimal 50089.

It is the case though that on my machine, if I press '?' then call
getch() it will return 0xC3.  A further call to getch() will return
0xA9.  This I was I was talking about getch() returning bytes: to me it
behaves as if it returns the encoded characters byte by byte.

>> Instead of getting a stream of bytes and special keycodes (with value >
>> 255) from getch(), what I want is a stream of *unicode characters* and
>> special keycodes.
>
> This is what getch(3NCURSES) does: it returns the integer value of one
> "unicode character".

It is not what happens in my tests.  I have made a simple testing
script, see below.

> Likewise, I would assume that looping over the python equivalent of
> getch() will not return a stream of bytes but rather a "stream" of
> integers that map one to one to the "unicode characters" that were
> entered at the terminal.



> Note: I am only familiar with languages such as English, Spanish,
> French, etc. where only one terminal cell is used for each glyph. My
> understanding is that things get somewhat more complicated with
> languages that require so-called "wide characters" - two terminal cells
> per character, but that's a different issue.
>
>> So, still assuming utf-8 encoding in the terminal, if I type:
>> 
>>     T?[KEY_UP]?a
>> 
>> iterating call to the getch() function will give me this sequence of
>> integers:
>> 
>>     84, 195, 169, 259,   195, 167, 97
>>     T-  ?-------  KEY_UP ?-------  a-
>> 
>> But what I want to get this stream instead:
>> 
>>     u'T', u'?', 259, u'?', u'a'
>
> No, for the above, getch() will return:
>
>      84, 50089, 259, 50087, 97
>
> .. which is "functionally" equivalent to:
>
>      u'T', u'?', 259, u'?', u'a'
>
> [..]
>
> So shouldn't this issue boil down to just a matter of casting the
> integers to the "u" data type?
>
> This short snippet may help clarify the above:
>
> -----------------------------------------------------------------------
> #include <locale.h>
> #include <ncurses.h>
> #include <stdlib.h>
> #include <stdio.h>
> #include <string.h>
>
> int unichar;
>
> int main(int argc, char *argv[])
> {
>   setlocale(LC_ALL, "en_US.UTF.8");        /* make sure UTF8       */
>   initscr();                               /* start curses mode    */
>   raw();
>   keypad(stdscr, TRUE);                    /* pass special keys    */
>   unichar = getch();                       /* read terminal        */
>
>   mvprintw(24, 0, "Key pressed is = %4x ", unichar);
>
>   refresh();
>   getch();                                 /* wait                 */
>   endwin();                                /* leave curses mode    */
>   return 0;
> }
> -----------------------------------------------------------------------
>
> Hopefully you have access to a C compiler:
>
> $ gcc -lncurses uni00.c -o uni00

Thanks for this.  When I test it on my machine (BTW it is MacOS 10.5.7),
if I type an ASCII character (e.g. 'A'), I get its ASCII code (0x41),
but if I type a non-ascii character (e.g. '?') I get back to the prompt
immediately.  It must be because two values are queued for getch.  I
should try it on a Linux machine, but I don't have one handy at the
moment.

I have made a little test script in Python which is similar but will
only stop when 'Esc' is pressed.

--------------------------------------------------
import curses

def getcodes(win):
    codes = []
    while True:
        c = win.getch()
        if c == 27:
            return codes
        codes.append(c)

print curses.wrapper(getcodes)
--------------------------------------------------

If I try this in a Terminal and type 'sou?i[ESC]', I get this:

[115, 111, 117, 195, 167, 105]
 s--, o--, u--, ?-------, i--

As you see, two calls to getch() were necessary after typing '?'.
BTW on the same terminal:

marigold:junk arno$ locale
LANG="en_GB.UTF-8"
LC_COLLATE="en_GB.UTF-8"
LC_CTYPE="en_GB.UTF-8"
LC_MESSAGES="en_GB.UTF-8"
LC_MONETARY="en_GB.UTF-8"
LC_NUMERIC="en_GB.UTF-8"
LC_TIME="en_GB.UTF-8"
LC_ALL=

I will have to do tests with other encodings.

-- 
Arnaud


From yinon.me at gmail.com  Sun May 31 04:30:32 2009
From: yinon.me at gmail.com (Yinon Ehrlich)
Date: Sun, 31 May 2009 01:30:32 -0700 (PDT)
Subject: Only run one specific test
References: <87k542dtzq.fsf@vostro.rath.org>
	<mailman.851.1243534574.8015.python-list@python.org> 
	<87skipc9wp.fsf@vostro.rath.org>
Message-ID: <99f13d77-3d0c-4b7a-af9f-4ae1e035a69e@h18g2000yqj.googlegroups.com>


>
> Yes, that works indeed. But in practice the modules_to_import list is
> filled by parsing the contents of a test/*.py directory. That's why I
> import dynamically with __import__.
>
> Nevertheless, you got me on the right track. After I explicitly added
> the modules to the global namespace (globals()["mytest"] =
> __import__("mytest")), it works fine. Thx!

Another way to do it is using imp.load_source,
see http://waf.googlecode.com/svn/trunk/test/Test.py
  Yinon


From michele.petrazz at REMOTEME_unipex.it  Sun May 31 04:37:29 2009
From: michele.petrazz at REMOTEME_unipex.it (Michele Petrazzo)
Date: Sun, 31 May 2009 10:37:29 +0200
Subject: try except inside exec
In-Reply-To: <f8fa5a89-9b49-4e1f-a4e4-c369ba6c71ae@s31g2000vbp.googlegroups.com>
References: <gvor0g$679$1@nnrp-beta.newsland.it>
	<0152323a-c0b3-48e2-aa69-8035c836990a@n8g2000vbb.googlegroups.com>
	<gvp0gn$9qh$1@nnrp-beta.newsland.it>
	<f8fa5a89-9b49-4e1f-a4e4-c369ba6c71ae@s31g2000vbp.googlegroups.com>
Message-ID: <gvtfk9$o8n$1@nnrp-beta.newsland.it>

Aaron Brady wrote:
> Exceptions are only caught when raised in a 'try' statement.  If you
>  don't raise the exception in a try statement, it won't be caught.
> 
> The function you posted will raise an exception.  If you are making 
> the call yourself, that is, if only the definition is foreign, then 
> simply catch exceptions when so.
> 

Seeing my code and reading you post I found that... yes, are a my fault!
I'm catching only an exception in a code/function definition, no its
execution!

Just modified my code to catch the exception *inside* the def and not
before and... now work!

Michele


From beni.cherniavsky at gmail.com  Sun May 31 05:41:14 2009
From: beni.cherniavsky at gmail.com (Beni Cherniavsky)
Date: Sun, 31 May 2009 02:41:14 -0700 (PDT)
Subject: Optimizing math functions
References: <mailman.619.1243084999.8015.python-list@python.org>
Message-ID: <c272be44-d369-40c2-a5ff-ce9bb2bbf805@c36g2000yqn.googlegroups.com>

On May 23, 4:22?pm, Esmail <ebo... at hotmail.com> wrote:
>
> Is there some sort of simple Python module that would allow me to
> evaluate this type of function?
>
> In this particular instance I am interested in the minimum of
>
> ? ?x * sin(4*x) + 1.1 * sin(2*y), where x,y in range 0-10
>
> though in other problems the range may not be identical for x and y.

Take a look at http://openopt.org (python-scikits-openopt on debian/
ubuntu) - a lot of optimization engines under one interface, so you
can try different engines easily and without learning many interfaces.

>>> import openopt
>>> from numpy import *
# openopt passes parameters as single vector.
>>> def f((x,y)):
	return x * sin(4*x) + 1.1 * sin(2*y)
# GLP finds global minimum - can be hard, but let's try.
# I'm not constraining the effort in hope it will converge quickly.
>>> opt = openopt.GLP(f, lb=array([0, 0]), ub=array([10, 10]))
# 'galileo' is one of the supported GLP solvers, included out of the
box.
>>> sol = opt.solve('galileo', plot=True)
-----------------------------------------------------
solver: galileo   problem: unnamed
 iter    objFunVal
    0  3.966e+00
   10  -6.190e+00
   20  -7.613e+00
   30  -7.613e+00
   35  -7.613e+00
istop:  11 (Non-Success Number > maxNonSuccess = 15)
Solver:   Time Elapsed = 0.78 	CPU Time Elapsed = 0.24
Plotting: Time Elapsed = 8.04 	CPU Time Elapsed = 2.21
objFunValue: -7.6132332 (feasible, max constraint =  0)
### here you need to close the runtime-value graph to continue ###
>>> sol.ff
-7.6132331733254421
>>> sol.xf
array([ 7.3418726 ,  5.44153445])

That is x=7.3418726, y=5.44153445 gives f=-7.6132331733254421.
Makes sense?


From beni.cherniavsky at gmail.com  Sun May 31 05:51:18 2009
From: beni.cherniavsky at gmail.com (Beni Cherniavsky)
Date: Sun, 31 May 2009 02:51:18 -0700 (PDT)
Subject: Optimizing math functions
References: <mailman.619.1243084999.8015.python-list@python.org> 
	<c272be44-d369-40c2-a5ff-ce9bb2bbf805@c36g2000yqn.googlegroups.com>
Message-ID: <57cd6ea8-c097-442a-9048-ede55ca68f9a@x3g2000yqa.googlegroups.com>

On May 31, 12:41?pm, Beni Cherniavsky <beni.cherniav... at gmail.com>
wrote:
>
> Take a look athttp://openopt.org(python-scikits-openopt on debian/
> ubuntu) - a lot of optimization engines under one interface, so you
> can try different engines easily and without learning many interfaces.
>
Correction: don't use the debian package, it uses an old snapshot of
openopt.
Install from svn, it's very easy (checkout, setup.py).


From tjreedy at udel.edu  Sun May 31 06:32:32 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 31 May 2009 06:32:32 -0400
Subject: Have a variable column length in printf
In-Reply-To: <4A223001.5010809@islandtraining.com>
References: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
	<4A223001.5010809@islandtraining.com>
Message-ID: <gvtmbu$s0v$1@ger.gmane.org>

Gary Herron wrote:
> Cameron Pulsford wrote:
>> Hello all, I'm trying to pretty print a list, so I am doing something 
>> like
>>
>> print '%3d' % integer
>>
>> only I would like that 3 to be a variable, instead of hardcoded. Is 
>> this possible, or are there any other ways to accomplish this? Thanks!
> 
> Use a '*' instead of fixed width, and then supply the actual width as a 
> separate parameter:
> 
>  >>> print '%*d' % (5,123)
>  123

In the new string formating, fields can be nested withing fields.  For 
3.1, with auto field numbering:
 >>> "{:{}d}".format(12,4)
'  12'

Otherwise, {0:{1}d}

tjr



From arnodel at googlemail.com  Sun May 31 07:08:33 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 31 May 2009 12:08:33 +0100
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl> <m2r5y61f5y.fsf@googlemail.com>
	<m2octacim1.fsf@cs.uu.nl> <m2iqjh23jq.fsf@googlemail.com>
	<003e1491$0$9723$c3e8da3@news.astraweb.com>
Message-ID: <m263fh1qdq.fsf@googlemail.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

> On Sun, 31 May 2009 07:24:09 +0100, Arnaud Delobelle wrote:
>
>> AFAIK, 'complexity' means 'worst case complexity' unless otherwise
>> stated.
>
> No, it means "average or typical case" unless otherwise specified. 
> Consult almost any comp sci text book and you'll see hash tables with 
> chaining (like Python dicts) described as O(1) rather than O(N), 
> Quicksort as O(N log N) instead of O(N**2), and similar. If the default 
> was "worst case unless otherwise specified", then Quicksort would be 
> called "Slower than Bubblesort Sort".
>
> (Both are O(N**2), but Quicksort does more work.)

OK.  I remember from my student years when studying complexity theory
that complexity implicitely referred to worst case complexity.  I
assumed this was a widely used convention - I don't have any evidence
that it is so you may very well be correct.

Anyway, it's good to know that quicksort is O(n^2) in the worst case -
and that this worst case can crop up very easily in some situations,
especially if not too much care has been taken implementing it.

[...]

> It is simply misleading to describe dicts as O(N) without the 
> qualification "if the data is chosen maliciously, or otherwise by an 
> incredible fluke". And even if it isn't, Piet explicitly said he was 
> talking about the average behaviour, not worst.

But the OP only mentioned 'complexity', not 'average complexity', and I
imagine that he knows the average case complexity of accessing a key in
a hashtable.

-- 
Arnaud


From ldo at geek-central.gen.new_zealand  Sun May 31 07:20:40 2009
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 31 May 2009 23:20:40 +1200
Subject: which database is suitable for small applications
References: <8ca278430905260133n3cdd12dcq667a5cdeada29e1e@mail.gmail.com>
	<mailman.744.1243333471.8015.python-list@python.org>
	<52801358-c037-458d-8857-a78c2d881ddb@z16g2000prd.googlegroups.com>
Message-ID: <gvtp69$2i9$1@lust.ihug.co.nz>

In message <52801358-c037-458d-8857-
a78c2d881ddb at z16g2000prd.googlegroups.com>, Ankit wrote:

> If your application does not require you to add very heavy data then
> you can also use flat files to do your stuff.
> Its always a better to use Databases ...

It's not always better to use databases. By definition, data for a ?small? 
application is bound to fit entirely in RAM. So certainly the simplest thing 
to do is read a whole data file in at the start, and write the entire 
updated data structure back out again at the end.



From martin at hvidberg.net  Sun May 31 08:08:40 2009
From: martin at hvidberg.net (martin at hvidberg.net)
Date: Sun, 31 May 2009 05:08:40 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
	<023130ef$0$19421$c3e8da3@news.astraweb.com>
Message-ID: <f84b2a23-9e6b-46f3-9e7a-7b1c8ce5eeb1@k2g2000yql.googlegroups.com>

On May 30, 4:10?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sat, 30 May 2009 12:06:55 +0200, jkv wrote:
> > I added a few lines to your script, and now it ought to only print files
> > newer than 3601 seconds (3600 seconds is one hour).
> ...
> > ? ? #if file newer than one hour print a line
> > ? ? if time_difference < 3601:
>
> That's a potential off-by-one error. That may print files that are older
> than one hour. Admittedly, they'll be off by less than one second, but if
> you're going to write code, write correct code. The right test is:
>
> ? ? if time_difference <= 3600:
>
> (and you may even want to deal with files that have a *negative* time
> difference, e.g. they were created apparently in the future).
>
> This is particularly necessary if you use time.time() to generate the
> current time, since that returns fractions of a second. But even if you
> don't, it's still the right thing to do: it's defensive programming.
> Rather than assume that all file systems store timestamps accurate only
> to a second, assume that some file system, somewhere, will be accurate to
> fractions of a second, and code accordingly.
>
> That way, no matter what the file system does, your code will still do
> the right thing, and (in this case) it doesn't even cost you anything.
>
> --
> Steven

Hi Steve thanks for your comment.
But I only need it to re-run some test scripts in case there seems to
be hick-up in our live download of satellite images. It's not critical
within seconds, not even within minutes...
But in principel the potential error could of cause be important - in
other context.

:-) M


From martin at hvidberg.net  Sun May 31 08:14:44 2009
From: martin at hvidberg.net (martin at hvidberg.net)
Date: Sun, 31 May 2009 05:14:44 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
	<4a211df1$0$25199$ba624c82@nntp02.dk.telia.net> 
	<00cd89ce-cab2-42bf-8b91-0b147e6763e1@t21g2000yqi.googlegroups.com> 
	<mailman.934.1243719478.8015.python-list@python.org>
Message-ID: <4b71bdf4-566c-416f-b7b1-148f1eadbd36@c19g2000yqc.googlegroups.com>

On May 30, 11:37?pm, jkv <j... at unixcluster.dk> wrote:
> mar... at hvidberg.net wrote:
> > Thanks both
>
> > The first answer is quite instuctive, the other one might be the one
> > I'll use in t
>
> I didn't receive the other answer, could you please forward it to me?> So 2x thanks.
>
> You are welcome.
>
> I took another look at your code, and you can compress it all to a if
> "oneliner":
> (and thanks to Steven for the <= reminder)
>
> ? ? ? ? if os.path.isfile(x):
> ? ? ? ? ? ? nSize = os.path.getsize(x)
> ? ? ? ? ? ? #if oneliner
> ? ? ? ? ? ? if time.mktime(time.localtime()) -
> time.mktime(time.localtime(os.path.getmtime(x))) <= 3600:
> ? ? ? ? ? ? ? print ('HT fil -> %s %d @ %s') % (x, nSize, time.asctime)

I encurrage both Clarity and Brevity, but usually in that order.
In other words, I don't mind to split a statement in two (or three)
sub-sentenses, if it increases Clarity. As long as it dosn't so large
that I loose the overview, and as long as it dosn't affect runtime
performance.


From martin at hvidberg.net  Sun May 31 08:19:41 2009
From: martin at hvidberg.net (martin at hvidberg.net)
Date: Sun, 31 May 2009 05:19:41 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<fa295d10-693d-4277-990a-6d4baff520b3@c9g2000yqm.googlegroups.com>
Message-ID: <3fab52de-f2db-4812-a80a-d195d2223730@y7g2000yqa.googlegroups.com>

>
> http://en.wikipedia.org/wiki/Subtraction
>


Only one problem, wise arse:
TypeError: unsupported operand type(s) for -: 'time.struct_time' and
'time.struct_time'

Like I didn't try that...


From sjmachin at lexicon.net  Sun May 31 09:06:49 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 31 May 2009 06:06:49 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<fa295d10-693d-4277-990a-6d4baff520b3@c9g2000yqm.googlegroups.com> 
	<3fab52de-f2db-4812-a80a-d195d2223730@y7g2000yqa.googlegroups.com>
Message-ID: <b0bee236-670d-40f1-b274-b6db88af1796@j32g2000yqh.googlegroups.com>

On May 31, 10:19?pm, mar... at hvidberg.net wrote:
> >http://en.wikipedia.org/wiki/Subtraction
>
> Only one problem, wise arse:
> TypeError: unsupported operand type(s) for -: 'time.struct_time' and
> 'time.struct_time'
>
> Like I didn't try that...

The point being that you can subtract them in other ways than by
shoving a - between them and throwing the result at Python. What you
were doing was like saying "I was born in January MCMLXXXIX and it's
now MMIX; how do I work out how old I am?" when you *already* had the
relevant numbers in a easily-subtractable form.


From bdsatish at gmail.com  Sun May 31 09:39:02 2009
From: bdsatish at gmail.com (bdsatish)
Date: Sun, 31 May 2009 06:39:02 -0700 (PDT)
Subject: Class Methods help
Message-ID: <db09ede0-f8b3-433f-845e-f41adeeb7b99@a36g2000yqc.googlegroups.com>

Hi,

    I have a question regarding the difference b/w "class methods" and
"object methods". Consider for example:

class  MyClass:
    x = 10

Now I can access MyClass.x -- I want a similar thing for functions. I
tried

class MyClass:
    def  some_func(x):
        return x+2

When I call MyClass.some_func(10) -- it fails, with error message:


TypeError: unbound method some_func() must be called with MyClass
instance as first argument (got int instance instead)

OK. I figured out that something like this works:
obj = MyClass()
y = obj.some_func(10)

BUT, this means that we have functions applying for instances. That is
we have "instance method". Now, how do I implement some function which
I can invoke with the class name itself ? Instead of creating a dummy
object & then calling.... In short, how exactly do I create "class
methods" ??









From python.list at tim.thechases.com  Sun May 31 09:43:48 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 31 May 2009 08:43:48 -0500
Subject: Class Methods help
In-Reply-To: <db09ede0-f8b3-433f-845e-f41adeeb7b99@a36g2000yqc.googlegroups.com>
References: <db09ede0-f8b3-433f-845e-f41adeeb7b99@a36g2000yqc.googlegroups.com>
Message-ID: <4A228994.6020706@tim.thechases.com>

> class MyClass:
>     def  some_func(x):
>         return x+2
> 
> When I call MyClass.some_func(10) -- it fails, with error message:
> 
> 
> TypeError: unbound method some_func() must be called with MyClass
> instance as first argument (got int instance instead)
> 
> OK. I figured out that something like this works:
> obj = MyClass()
> y = obj.some_func(10)
> 
> BUT, this means that we have functions applying for instances. That is
> we have "instance method". Now, how do I implement some function which
> I can invoke with the class name itself ? Instead of creating a dummy
> object & then calling.... In short, how exactly do I create "class
> methods" ??

You mean the classmethod decorator? :)

   class MyClass:
     @classmethod
     def some_func(cls, x):
       return x+2

   MyClass.some_func(42)

(the decorator syntax was added in 2.4, so if you need it in 
pre-2.4, you'd have to do

   class MyClass:
     def some_func(cls, x):
       return x+2
     some_func = classmethod(some_func)

to get the same behavior)

-tkc




From lie.1296 at gmail.com  Sun May 31 09:44:26 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 31 May 2009 13:44:26 GMT
Subject: Class Methods help
In-Reply-To: <db09ede0-f8b3-433f-845e-f41adeeb7b99@a36g2000yqc.googlegroups.com>
References: <db09ede0-f8b3-433f-845e-f41adeeb7b99@a36g2000yqc.googlegroups.com>
Message-ID: <_QvUl.14954$y61.8697@news-server.bigpond.net.au>

bdsatish wrote:
> Hi,
> 
>     I have a question regarding the difference b/w "class methods" and
> "object methods". Consider for example:
> 
> class  MyClass:
>     x = 10
> 
> Now I can access MyClass.x -- I want a similar thing for functions. I
> tried
> 
> class MyClass:
>     def  some_func(x):
>         return x+2
> 
> When I call MyClass.some_func(10) -- it fails, with error message:
> 
> 
> TypeError: unbound method some_func() must be called with MyClass
> instance as first argument (got int instance instead)
> 
> OK. I figured out that something like this works:
> obj = MyClass()
> y = obj.some_func(10)
> 
> BUT, this means that we have functions applying for instances. That is
> we have "instance method". Now, how do I implement some function which
> I can invoke with the class name itself ? Instead of creating a dummy
> object & then calling.... In short, how exactly do I create "class
> methods" ??
with staticmethod decorator:

>>> class MyClass:
...     @staticmethod
...     def some_func(x):
...         return x+2
...
>>> MyClass.some_func(10)
12



From bdsatish at gmail.com  Sun May 31 09:48:25 2009
From: bdsatish at gmail.com (bd satish)
Date: Sun, 31 May 2009 16:48:25 +0300
Subject: Class Methods help
In-Reply-To: <_QvUl.14954$y61.8697@news-server.bigpond.net.au>
References: <db09ede0-f8b3-433f-845e-f41adeeb7b99@a36g2000yqc.googlegroups.com>
	<_QvUl.14954$y61.8697@news-server.bigpond.net.au>
Message-ID: <fa06d30b0905310648q7d01cd43ncb56ab723ae53f40@mail.gmail.com>

Thanks to Tim Chase & Lie Ryan !!  That was exactly what I was looking for !!

It's time for me to now read the documentation of "decorators" and
@classmethod and also @staticmethod.

I'm quite new to decorators...


-- Satish BD


On Sun, May 31, 2009 at 4:44 PM, Lie Ryan <lie.1296 at gmail.com> wrote:
> bdsatish wrote:
>> Hi,
>>
>> ? ? I have a question regarding the difference b/w "class methods" and
>> "object methods". Consider for example:
>>
>> class ?MyClass:
>> ? ? x = 10
>>
>> Now I can access MyClass.x -- I want a similar thing for functions. I
>> tried
>>
>> class MyClass:
>> ? ? def ?some_func(x):
>> ? ? ? ? return x+2
>>
>> When I call MyClass.some_func(10) -- it fails, with error message:
>>
>>
>> TypeError: unbound method some_func() must be called with MyClass
>> instance as first argument (got int instance instead)
>>
>> OK. I figured out that something like this works:
>> obj = MyClass()
>> y = obj.some_func(10)
>>
>> BUT, this means that we have functions applying for instances. That is
>> we have "instance method". Now, how do I implement some function which
>> I can invoke with the class name itself ? Instead of creating a dummy
>> object & then calling.... In short, how exactly do I create "class
>> methods" ??
> with staticmethod decorator:
>
>>>> class MyClass:
> ... ? ? @staticmethod
> ... ? ? def some_func(x):
> ... ? ? ? ? return x+2
> ...
>>>> MyClass.some_func(10)
> 12
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From Scott.Daniels at Acm.Org  Sun May 31 10:21:48 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 31 May 2009 07:21:48 -0700
Subject: How do I sample randomly based on some probability(wightage)?
In-Reply-To: <a380edb3-77f6-4e0d-bccd-2bff92b7cb1b@k2g2000yql.googlegroups.com>
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<uIadnZ8appu3y4DXnZ2dnUVZ_radnZ2d@pdx.net>
	<a380edb3-77f6-4e0d-bccd-2bff92b7cb1b@k2g2000yql.googlegroups.com>
Message-ID: <FOGdnQw3svOEDL_XnZ2dnUVZ_hGdnZ2d@pdx.net>

Sumitava Mukherjee wrote:
> On May 27, 8:08 pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
>> Sumitava Mukherjee wrote:
>>> I need to randomly sample from a list where all choices have weights
>>> attached to them. The probability of them being choosen is dependent
>>> on the weights.
>> I am not sure why everybody is normalizing by dividing the weights.
>> This isa possibility (I had fun writing it).
>>
>> def sample_without_replacement(choices, weights):
>> ...  combined = [(w, v) for w, v in zip(weights, choices) if w > 0]
>> ...  total = sum(w for w, v in combined) # sum(weights) also works
>>      while combined:
>> ...
>>          yield choice
>>          total -= weight
>>          if weight > total * 256: # arbitrary choice for recalculation
>>              # precision affected, rebuild
>>              total = sum(w for w, v in combined)
>>          del combined[n]
>>      raise ValueError('Samplng more than %d without replacement?' % (
>>                        sum(1 for w in weights if w > 0)))
>> ...
Should be:
            total -= weight
            yield choice
            del combined[n]
            if weight > total * 256: # arbitrary choice for recalculation
                 # precision affected, rebuild
                 total = sum(w for w, v in combined)
        raise ValueError('Samplng more than %d without replacement?' % (
                                       sum(1 for w in weights)))
There were two mistakes, both related to the definition of combined:
  (1) Combined only holds positive values, so testing in sum is silly.
  (2) Total is meant to track the sum of weights in combined, and the
      update was misplaced with respect to the delete.

> Among all the help (all of which I really appreciate), I found your
> solution closest to what I was expecting. Thanks a lot Scott.

You are welcome (presuming I didn't simply do your homework).  I only
noticed the problems above while scanning your reply.  The failures I
noticed should have been caught with good tests or a pair programming
partner.  Of course, in this environment, I didn't have either high
quality tests or a partner (I did simple hand testing and eyeball
analysis).

--Scott David Daniels
Scott.Daniels at Acm.Org


From Scott.Daniels at Acm.Org  Sun May 31 11:00:04 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 31 May 2009 08:00:04 -0700
Subject: hash and __eq__
In-Reply-To: <m263fh1qdq.fsf@googlemail.com>
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl> <m2r5y61f5y.fsf@googlemail.com>
	<m2octacim1.fsf@cs.uu.nl> <m2iqjh23jq.fsf@googlemail.com>
	<003e1491$0$9723$c3e8da3@news.astraweb.com>
	<m263fh1qdq.fsf@googlemail.com>
Message-ID: <1qKdnek8ke6MB7_XnZ2dnUVZ_qadnZ2d@pdx.net>

Arnaud Delobelle wrote:
> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> 
>> On Sun, 31 May 2009 07:24:09 +0100, Arnaud Delobelle wrote:
>>
>>> AFAIK, 'complexity' means 'worst case complexity' unless otherwise
>>> stated.
>> No, it means "average or typical case" unless otherwise specified. 

I think you both are standing on opposite sides of a shift in notation.
Mathematics changes notations all the time, and new students are
presented notation as if it were a fixed thing.  What I think is
happening is that O-notation was a very technical notation used
for comparing abstract algorithms (providing an analysis that would
survive centuries of engineering improvement of the machines).  More
recently we have seen more use of average-case performance analysis,
in service of shorter-term accuracy (I guess).  Certainly this has
given us some data structures that would be hard to justify on a
worst-case analysis.  I suspect the default is shifting towards
average case (although it may already be there).  Certainly best
practice for the next couple of decades would be to be explicit
about the meaning

--Scott David Daniels
Scott.Daniels at Acm.Org


From __peter__ at web.de  Sun May 31 12:11:06 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 31 May 2009 18:11:06 +0200
Subject: How do I sample randomly based on some probability(wightage)?
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<uIadnZ8appu3y4DXnZ2dnUVZ_radnZ2d@pdx.net>
	<a380edb3-77f6-4e0d-bccd-2bff92b7cb1b@k2g2000yql.googlegroups.com>
	<FOGdnQw3svOEDL_XnZ2dnUVZ_hGdnZ2d@pdx.net>
Message-ID: <gvua6l$fkb$01$1@news.t-online.com>

Scott David Daniels wrote:

> raise ValueError('Samplng more than %d without replacement?' % (
> sum(1 for w in weights)))

That would be len(weights)

> There were two mistakes, both related to the definition of combined:
> (1) Combined only holds positive values, so testing in sum is silly.
 
but I think your first version was correct; I don't see were you remove the 
0-items from weights.

Peter



From seattlehanks at yahoo.com  Sun May 31 12:24:23 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 09:24:23 -0700 (PDT)
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<af1d0d42-0d62-4857-9e5c-6b18b7d79891@x3g2000yqa.googlegroups.com> 
	<cf7d562c-778c-4f06-a2ce-a58561dc0dfb@h2g2000yqg.googlegroups.com> 
	<fdef7f4c-e7f2-4afa-aa72-6b1550d11c3d@f19g2000yqh.googlegroups.com> 
	<m2eiu52102.fsf@googlemail.com>
Message-ID: <be36c91d-51f7-4675-8de1-63de60b1385b@n21g2000vba.googlegroups.com>

On May 31, 12:19?am, Arnaud Delobelle <arno... at googlemail.com> wrote:
> LittleGrasshopper <seattleha... at yahoo.com> writes:
> > On May 30, 6:15?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> >> On May 30, 5:32?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
> >> > On May 30, 4:01?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
> >> > > I am experimenting with metaclasses, trying to figure out how things
> >> > > are put together.
>
> Have you read Guido's 'Unifying types and classes in Python 2.2' [1]? ?I
> read it a long time ago but I remember it being very enlightening.
>
> [1]http://www.python.org/download/releases/2.2.3/descrintro/
>
> --
> Arnaud

I haven't actually read it, but I will now. Thanks for pointing it
out, Arnaud.


From cameron.pulsford at gmail.com  Sun May 31 12:33:58 2009
From: cameron.pulsford at gmail.com (Cameron Pulsford)
Date: Sun, 31 May 2009 12:33:58 -0400
Subject: Have a variable column length in printf
In-Reply-To: <gvtmbu$s0v$1@ger.gmane.org>
References: <5700df6b0905302258p2ae0f947ocddcff1e6cef5c26@mail.gmail.com>
	<4A223001.5010809@islandtraining.com> <gvtmbu$s0v$1@ger.gmane.org>
Message-ID: <5700df6b0905310933v39294468sa44f325ba9628cfd@mail.gmail.com>

Thanks all, I think I'l stick with the '*' method because this is just a one
time thing for a __repr__ function and it seems easiest.

On Sun, May 31, 2009 at 6:32 AM, Terry Reedy <tjreedy at udel.edu> wrote:

> Gary Herron wrote:
>
>> Cameron Pulsford wrote:
>>
>>> Hello all, I'm trying to pretty print a list, so I am doing something
>>> like
>>>
>>> print '%3d' % integer
>>>
>>> only I would like that 3 to be a variable, instead of hardcoded. Is this
>>> possible, or are there any other ways to accomplish this? Thanks!
>>>
>>
>> Use a '*' instead of fixed width, and then supply the actual width as a
>> separate parameter:
>>
>>  >>> print '%*d' % (5,123)
>>  123
>>
>
> In the new string formating, fields can be nested withing fields.  For 3.1,
> with auto field numbering:
> >>> "{:{}d}".format(12,4)
> '  12'
>
> Otherwise, {0:{1}d}
>
> tjr
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From cjns1989 at gmail.com  Sun May 31 13:07:48 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Sun, 31 May 2009 13:07:48 -0400
Subject: decoding keyboard input when using curses
In-Reply-To: <m2ab4t1yv3.fsf@googlemail.com>
References: <m2vdni1fbc.fsf@googlemail.com>
	<mailman.944.1243750942.8015.python-list@python.org>
	<m2ab4t1yv3.fsf@googlemail.com>
Message-ID: <20090531170748.GB2451@turki.gavron.org>

On Sun, May 31, 2009 at 04:05:20AM EDT, Arnaud Delobelle wrote:

[..]

> Thanks for this.  When I test it on my machine (BTW it is MacOS 10.5.7),
> if I type an ASCII character (e.g. 'A'), I get its ASCII code (0x41),
> but if I type a non-ascii character (e.g. '?') I get back to the prompt
> immediately.  It must be because two values are queued for getch.  I
> should try it on a Linux machine, but I don't have one handy at the
> moment.

Well so much for transparency :-(

Try this:

#include <locale.h>
#include <ncurses.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

int ct;
wint_t unichar;

int main(int argc, char *argv[])
{
  setlocale(LC_ALL, "");                 /* make sure UTF8       */
  initscr();
  raw();
  keypad(stdscr, TRUE);
  ct = get_wch(&unichar);                /* read character       */
  mvprintw(24, 0, "Key pressed is = %4x ", unichar);

  refresh();
  get_wch();
  endwin();
  return 0;
}

gcc -lncursesw uni10.c -o uni10         # different lib..
             ^

Seems there's more to it than my assupmtion that the python wrapper was
not wrapping as transparaently as it should.. here I'm using wide
characters.. not sure how this translates to python.

CJ




From jmd.khanna at gmail.com  Sun May 31 14:10:32 2009
From: jmd.khanna at gmail.com (tristan625)
Date: Sun, 31 May 2009 11:10:32 -0700 (PDT)
Subject: problem with python com and python extensions
Message-ID: <aae53a2c-40e7-491b-82c6-d10d04672684@b9g2000yqm.googlegroups.com>

hi all,
Here is my problem,i have developed a python extension using
vs2003 ,iam using python 2.5.2,the extension enumerates the
certificates in the windows certificate store and returns a list of
tuples containing a tuple for each certificate found containing the
certificates display name,subject and issuer,everything works fine
when  i run the code through the interpreter,the problem comes when i
create a python com object that imports this extensions
functionality,the com dll is created successfully but i am unable to
access any of the functions in it .



any help will be great


From arnodel at googlemail.com  Sun May 31 14:30:54 2009
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 31 May 2009 19:30:54 +0100
Subject: decoding keyboard input when using curses
References: <m2vdni1fbc.fsf@googlemail.com>
	<mailman.944.1243750942.8015.python-list@python.org>
	<m2ab4t1yv3.fsf@googlemail.com>
	<mailman.951.1243789691.8015.python-list@python.org>
Message-ID: <m2zlctyvj5.fsf@googlemail.com>

Chris Jones <cjns1989 at gmail.com> writes:
[...]
> Try this:
>
> #include <locale.h>
> #include <ncurses.h>
> #include <stdlib.h>
> #include <stdio.h>
> #include <string.h>

/* Here I need to add the following include to get wint_t on macOS X*/

#include <wctype.h>

>
> int ct;
> wint_t unichar;
>
> int main(int argc, char *argv[])
> {
>   setlocale(LC_ALL, "");                 /* make sure UTF8       */
>   initscr();
>   raw();
>   keypad(stdscr, TRUE);
>   ct = get_wch(&unichar);                /* read character       */
>   mvprintw(24, 0, "Key pressed is = %4x ", unichar);
>
>   refresh();
>   get_wch();
>   endwin();
>   return 0;
> }
>
> gcc -lncursesw uni10.c -o uni10         # different lib..
>              ^

My machine doesn't know about libncursesw:

marigold:c arno$ ls /usr/lib/libncurses*
/usr/lib/libncurses.5.4.dylib
/usr/lib/libncurses.dylib
/usr/lib/libncurses.5.dylib

So I've compiled it with libncurses as before and it works.

This is what I get:

If I run the program and type '?', I get a code of 'e9'.

In python:

>>> print '\xe9'.decode('latin1')
?

So it has been encoded using isolatin1.  I really don't understand why.
I'll have to investigate this further.

If I change the line:

   setlocale(LC_ALL, "");                 /* make sure UTF8       */

to

   setlocale(LC_ALL, "en_GB.UTF-8");       /* make sure UTF8       */

then the behaviour is the same as before (i.e. get_wch() gets called
twice instantly).

I'll do some more investigating (when I can think of *what* to
investigate) and I will tell you my findings.

Thanks

-- 
Arnaud


From CGenie at gmail.com  Sun May 31 15:08:16 2009
From: CGenie at gmail.com (CoolGenie)
Date: Sun, 31 May 2009 12:08:16 -0700 (PDT)
Subject: automated web with python?
Message-ID: <c179782f-e5e7-4d9d-80af-f22f31deae44@y7g2000yqa.googlegroups.com>

Hello,
Recently my company changed the system. It is better for the
management, but for us workers it is a nightmare. For example, we are
required to enter a huge database (nested) using a web form! Make one
mistake and you have to edit it and then use 4 mouse clicks, not
counting the time it takes to load every web page.
My question is: can Python somewhat relieve this pain? Maybe this web
browser stuff could be somewhat automated... At first check it doesn't
seem easy, since it uses authorization methods, aspx, and so on... And
we don't have access to the underlying database, only this stupid web
form.
I'll appreciate any help.
Best regards,
Przemek


From Scott.Daniels at Acm.Org  Sun May 31 15:15:51 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 31 May 2009 12:15:51 -0700
Subject: How do I sample randomly based on some probability(wightage)?
In-Reply-To: <gvua6l$fkb$01$1@news.t-online.com>
References: <a552149d-71b3-4890-9110-073133dcb166@x31g2000prc.googlegroups.com>
	<uIadnZ8appu3y4DXnZ2dnUVZ_radnZ2d@pdx.net>
	<a380edb3-77f6-4e0d-bccd-2bff92b7cb1b@k2g2000yql.googlegroups.com>
	<FOGdnQw3svOEDL_XnZ2dnUVZ_hGdnZ2d@pdx.net>
	<gvua6l$fkb$01$1@news.t-online.com>
Message-ID: <Ro6dnYawJ4GeS7_XnZ2dnUVZ_sydnZ2d@pdx.net>

Peter Otten wrote:
> Scott David Daniels wrote:
>  [a real correction and a bogus one]
>> raise ValueError('Samplng more than %d without replacement?' % (
>> sum(1 for w in weights)))
> That would be len(weights)
Yup, probably I should have just saved len(combined).

> but I think your first version was correct; I don't see were you remove the 
> 0-items from weights.

You are right.  I thought I was looking at combined on the second,
realized my mistake, and thought, Oh well, it'll work out later.
The other mistake wasn't too bad either, as all that would happen
is that an internal exception would get raised, any answers delivered
are delivered with the correct probabilities.

--Scott David Daniels
Scott.Daniels at Acm.Org


From debatem1 at gmail.com  Sun May 31 15:38:46 2009
From: debatem1 at gmail.com (CTO)
Date: Sun, 31 May 2009 12:38:46 -0700 (PDT)
Subject: Q: finding distance between 2 time's
References: <90c970e0-630c-4910-91b9-ce6c547f0946@g1g2000yqh.googlegroups.com>
	<mailman.923.1243678617.8015.python-list@python.org>
	<4a211df1$0$25199$ba624c82@nntp02.dk.telia.net> 
	<00cd89ce-cab2-42bf-8b91-0b147e6763e1@t21g2000yqi.googlegroups.com> 
	<mailman.934.1243719478.8015.python-list@python.org>
	<627c674d-a357-4c8e-98dc-127d9f87346d@g37g2000yqn.googlegroups.com>
Message-ID: <1ca5b3ae-ba88-46ed-bd90-b8c631fdc41f@n8g2000vbb.googlegroups.com>

On May 30, 8:49?pm, John Machin <sjmac... at lexicon.net> wrote:
> ? > import time
> ? You are in a maze of twisty little functions, all alike.

Quote of the week. Perhaps the year. I hope you don't mind
me using it in the future.

Geremy Condra


From python at mrabarnett.plus.com  Sun May 31 15:41:51 2009
From: python at mrabarnett.plus.com (MRAB)
Date: Sun, 31 May 2009 20:41:51 +0100
Subject: automated web with python?
In-Reply-To: <c179782f-e5e7-4d9d-80af-f22f31deae44@y7g2000yqa.googlegroups.com>
References: <c179782f-e5e7-4d9d-80af-f22f31deae44@y7g2000yqa.googlegroups.com>
Message-ID: <4A22DD7F.2010903@mrabarnett.plus.com>

CoolGenie wrote:
> Hello,
> Recently my company changed the system. It is better for the
> management, but for us workers it is a nightmare. For example, we are
> required to enter a huge database (nested) using a web form! Make one
> mistake and you have to edit it and then use 4 mouse clicks, not
> counting the time it takes to load every web page.
> My question is: can Python somewhat relieve this pain? Maybe this web
> browser stuff could be somewhat automated... At first check it doesn't
> seem easy, since it uses authorization methods, aspx, and so on... And
> we don't have access to the underlying database, only this stupid web
> form.
> I'll appreciate any help.
> Best regards,
> Przemek

Have a look at Mechanize:

http://wwwsearch.sourceforge.net/mechanize/



From dfnsonfsduifb at gmx.de  Sun May 31 16:23:13 2009
From: dfnsonfsduifb at gmx.de (Johannes Bauer)
Date: Sun, 31 May 2009 22:23:13 +0200
Subject: Generating all combinations
Message-ID: <78g79iF1l1i8bU1@mid.dfncis.de>

Hello group,

I'm trying to write a function in Python which does the following: For a
number of arguments which are all lists, return a list (or generator)
which yields all tuples of combination. E.g:

foofunction()
# returns [ ]

foofunction([1, 2, 3])
# returns [ (1), (2), (3) ]

foofunction([1, 2, 3], ["a", "b"], ["x"])
# returns [ (1, "a", "x"), (1, "b", "x"),
            (2, "a", "x"), (2, "b", "x"),
            (3, "a", "x"), (3, "b", "x") ]

I must admit that I have no clue on how to do that efficiently (and more
importantly: in a variadic manner) in Python. Any help is appreciated!

Kind regards,
Johannes

-- 
"Meine Gegenklage gegen dich lautet dann auf bewusste Verlogenheit,
verl?sterung von Gott, Bibel und mir und bewusster Blasphemie."
         -- Prophet und Vision?r Hans Joss aka HJP in de.sci.physik
                         <48d8bf1d$0$7510$5402220f at news.sunrise.ch>


From Scott.Daniels at Acm.Org  Sun May 31 16:39:39 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 31 May 2009 13:39:39 -0700
Subject: Generating all combinations
In-Reply-To: <78g79iF1l1i8bU1@mid.dfncis.de>
References: <78g79iF1l1i8bU1@mid.dfncis.de>
Message-ID: <J8ednQSAK9M6dL_XnZ2dnUVZ_judnZ2d@pdx.net>

Johannes Bauer wrote:
> Hello group,
> 
> I'm trying to write a function in Python which does the following: For a
> number of arguments which are all lists, return a list (or generator)
> which yields all tuples of combination. E.g:

Look here:
   http://docs.python.org/library/itertools.html#itertools.product

(new in 2.6, but code works in lower versions).

--Scott David Daniels
Scott.Daniels at Acm.Org




From seattlehanks at yahoo.com  Sun May 31 16:49:07 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 13:49:07 -0700 (PDT)
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<af1d0d42-0d62-4857-9e5c-6b18b7d79891@x3g2000yqa.googlegroups.com> 
	<cf7d562c-778c-4f06-a2ce-a58561dc0dfb@h2g2000yqg.googlegroups.com> 
	<fdef7f4c-e7f2-4afa-aa72-6b1550d11c3d@f19g2000yqh.googlegroups.com> 
	<m2eiu52102.fsf@googlemail.com>
	<be36c91d-51f7-4675-8de1-63de60b1385b@n21g2000vba.googlegroups.com>
Message-ID: <eaf75582-0d22-4b31-b0e7-b8e5baa5c3b6@s21g2000vbb.googlegroups.com>

On May 31, 9:24?am, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> On May 31, 12:19?am, Arnaud Delobelle <arno... at googlemail.com> wrote:
>
>
>
> > LittleGrasshopper <seattleha... at yahoo.com> writes:
> > > On May 30, 6:15?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> > >> On May 30, 5:32?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
> > >> > On May 30, 4:01?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
> > >> > > I am experimenting with metaclasses, trying to figure out how things
> > >> > > are put together.
>
> > Have you read Guido's 'Unifying types and classes in Python 2.2' [1]? ?I
> > read it a long time ago but I remember it being very enlightening.
>
> > [1]http://www.python.org/download/releases/2.2.3/descrintro/
>
> > --
> > Arnaud
>
> I haven't actually read it, but I will now. Thanks for pointing it
> out, Arnaud.

I'm about 2/3 of the way through this paper (although I don't claim to
understand all of it.) There is some heavy duty material in there,
enough to make me feel really stupid and frustrated at times. I'm
making connections as I go though, hopefully everything will sink in
eventually.

The discussion on super(), especially the python code implementation,
clarified some of the doubts I had about how it is implemented
(including "unbound" super objects, which involve the descriptor
mechanism on the super object itself.)

Is this stuff actually tough, or am I just a dummy?


From ronn.ross at gmail.com  Sun May 31 16:55:41 2009
From: ronn.ross at gmail.com (Ronn Ross)
Date: Sun, 31 May 2009 16:55:41 -0400
Subject: RFID and Python
Message-ID: <9c8c445f0905311355i8d19fe5w62d77a49376ed8a6@mail.gmail.com>

I'm looking to play around with RFID and Python. Can anyone offer any
suggestions on the cheap? I'm possibly looking for a starter kit.
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From aahz at pythoncraft.com  Sun May 31 17:03:34 2009
From: aahz at pythoncraft.com (Aahz)
Date: 31 May 2009 14:03:34 -0700
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<m2eiu52102.fsf@googlemail.com>
	<be36c91d-51f7-4675-8de1-63de60b1385b@n21g2000vba.googlegroups.com>
	<eaf75582-0d22-4b31-b0e7-b8e5baa5c3b6@s21g2000vbb.googlegroups.com>
Message-ID: <gvurb6$ieu$1@panix3.panix.com>

In article <eaf75582-0d22-4b31-b0e7-b8e5baa5c3b6 at s21g2000vbb.googlegroups.com>,
LittleGrasshopper  <seattlehanks at yahoo.com> wrote:
>> On May 31, 12:19=A0am, Arnaud Delobelle <arno... at googlemail.com> wrote:
>>>
>>> [1]http://www.python.org/download/releases/2.2.3/descrintro/
>
>I'm about 2/3 of the way through this paper (although I don't claim to
>understand all of it.) There is some heavy duty material in there,
>enough to make me feel really stupid and frustrated at times. I'm
>making connections as I go though, hopefully everything will sink in
>eventually.
>
>Is this stuff actually tough, or am I just a dummy?

Definitely tough!  Metaclasses can cause dain bramage.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
    on-a-new-machine-ly y'rs  - tim


From dickinsm at gmail.com  Sun May 31 17:11:22 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sun, 31 May 2009 14:11:22 -0700 (PDT)
Subject: Generating all combinations
References: <78g79iF1l1i8bU1@mid.dfncis.de>
Message-ID: <5d89fe37-2d97-4682-b836-134997d7a048@c9g2000yqm.googlegroups.com>

On May 31, 9:23?pm, Johannes Bauer <dfnsonfsdu... at gmx.de> wrote:
> I'm trying to write a function in Python which does the following: For a
> number of arguments which are all lists, return a list (or generator)
> which yields all tuples of combination. E.g:
>
> foofunction()
> # returns [ ]

Are you sure that's what you want?  I'd expect [()] here (on the
basis that the empty product is a one-element set).  And
indeed that's what itertools.product gives:

>>> import itertools
>>> list(itertools.product())
[()]

> foofunction([1, 2, 3])
> # returns [ (1), (2), (3) ]

Presumably you mean [(1,), (2,), (3,)] here?

Mark


From mcfletch at vrplumber.com  Sun May 31 17:33:51 2009
From: mcfletch at vrplumber.com (Mike C. Fletcher)
Date: Sun, 31 May 2009 17:33:51 -0400
Subject: PyOpenGL Installation
In-Reply-To: <d76a72b7-3196-4fef-86b7-473c827dcfba@s16g2000vbp.googlegroups.com>
References: <d76a72b7-3196-4fef-86b7-473c827dcfba@s16g2000vbp.googlegroups.com>
Message-ID: <4A22F7BF.3070206@vrplumber.com>

Roastie wrote:
> The web info I have found for downloading/installing PyOpenGL and
> its dependencies for Windows is a nightmare.  Is there a place where
> all of
> the endless dependencies are packaged nicely with PyOpenGL?
>   
Hmm, "endless"?

    * Python (with ctypes, standard on everything >= 2.5)
    * OpenGL (standard on almost every Win32 machine save old Win95 boxes)

Possibly I'm missing something here?  If you just want PyOpenGL you only
need one file (the PyOpenGL package) + Python.  If you want to use it
with Numpy, you need to have numpy on the machine, same for GLUT, GLE
and the like, but they aren't required unless you want to use them. 
Heck, if you want you can even easy_install the package last I checked.

http://pyopengl.sourceforge.net/documentation/installation.html

My dictionary's definition of endless must be broken ;) :) ,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com



From btibert3 at gmail.com  Sun May 31 17:42:01 2009
From: btibert3 at gmail.com (Brock)
Date: Sun, 31 May 2009 14:42:01 -0700 (PDT)
Subject: Unzip Files
Message-ID: <09a73008-0b22-4d7e-8ca3-1a4eb235d421@e20g2000vbc.googlegroups.com>

Hi all,

I am new to python, so please don't attack me if this question is easy
or basic.  How can I go about extracting the contents of a zip file to
the same directory?  Can I extend this question to a zip file that
sits on the internet?

Point being I need to work with the files inside the zipped file, and
there are times when the file is already on my computer, and their
others where the datafile sits on the Internet.

Any help you can provide will be greatly appreciated.  In full
disclosure, I usually learn by example and not by trial and error, so
any nudges in the right direction will be greatly appreciated.

Many thanks,

Brock


From kmacphail at gmail.com  Sun May 31 18:17:59 2009
From: kmacphail at gmail.com (Kevin MacPhail)
Date: Sun, 31 May 2009 17:17:59 -0500
Subject: RFID and Python
In-Reply-To: <9c8c445f0905311355i8d19fe5w62d77a49376ed8a6@mail.gmail.com>
References: <9c8c445f0905311355i8d19fe5w62d77a49376ed8a6@mail.gmail.com>
Message-ID: <9766d5b90905311517h6eb72f26ta18dee1c175d45e8@mail.gmail.com>

On Sun, May 31, 2009 at 3:55 PM, Ronn Ross <ronn.ross at gmail.com> wrote:

> I'm looking to play around with RFID and Python. Can anyone offer any
> suggestions on the cheap? I'm possibly looking for a starter kit.
>

The Phidgets <http://www.phidgets.com> RFID starter kit sounds like it might
meet your needs.  There's at least one Python binding for the Phidgets
library that I'm aware of: http://www.lothar.com/Projects/Phidgets/

Cheers,

-K
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From thudfoo at opensuse.us  Sun May 31 18:22:49 2009
From: thudfoo at opensuse.us (member thudfoo)
Date: Sun, 31 May 2009 15:22:49 -0700
Subject: Generating all combinations
In-Reply-To: <J8ednQSAK9M6dL_XnZ2dnUVZ_judnZ2d@pdx.net>
References: <78g79iF1l1i8bU1@mid.dfncis.de>
	<J8ednQSAK9M6dL_XnZ2dnUVZ_judnZ2d@pdx.net>
Message-ID: <3d881a310905311522m51c685f2j3029c539aff745d6@mail.gmail.com>

On 5/31/09, Scott David Daniels <Scott.Daniels at acm.org> wrote:
> Johannes Bauer wrote:
>
> > Hello group,
> >
> > I'm trying to write a function in Python which does the following: For a
> > number of arguments which are all lists, return a list (or generator)
> > which yields all tuples of combination. E.g:
> >
>
>  Look here:
>
> http://docs.python.org/library/itertools.html#itertools.product
>
>  (new in 2.6, but code works in lower versions).
>

How would one go about installing the python 2.6 itertools code in python 2.5?

>  --Scott David Daniels
>  Scott.Daniels at Acm.Org
>
>
>
>  --
>  http://mail.python.org/mailman/listinfo/python-list
>


From cjns1989 at gmail.com  Sun May 31 18:23:39 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Sun, 31 May 2009 18:23:39 -0400
Subject: decoding keyboard input when using curses
In-Reply-To: <m2zlctyvj5.fsf@googlemail.com>
References: <m2vdni1fbc.fsf@googlemail.com>
	<mailman.944.1243750942.8015.python-list@python.org>
	<m2ab4t1yv3.fsf@googlemail.com>
	<mailman.951.1243789691.8015.python-list@python.org>
	<m2zlctyvj5.fsf@googlemail.com>
Message-ID: <20090531222338.GA2903@turki.gavron.org>

On Sun, May 31, 2009 at 02:30:54PM EDT, Arnaud Delobelle wrote:
> Chris Jones <cjns1989 at gmail.com> writes:

> [...]

> > Try this:
> >
> > #include <locale.h>
> > #include <ncurses.h>
> > #include <stdlib.h>
> > #include <stdio.h>
> > #include <string.h>
> 
> /* Here I need to add the following include to get wint_t on macOS X*/
> 
> #include <wctype.h>

Ah.. interesting. My posts were rather linux-centric, I must say.

Naturally, the library & header files setup on MacOS would likely
differ.

[..]

> > gcc -lncursesw uni10.c -o uni10   # different lib..
> >              ^
> 
> My machine doesn't know about libncursesw:
> 
> marigold:c arno$ ls /usr/lib/libncurses*
> /usr/lib/libncurses.5.4.dylib
> /usr/lib/libncurses.dylib
> /usr/lib/libncurses.5.dylib
> 
> So I've compiled it with libncurses as before and it works.

Nothing to complain about.. makes it even more seamless..!

> This is what I get:
> 
> If I run the program and type '?', I get a code of 'e9'.
> 
> In python:
> 
> >>> print '\xe9'.decode('latin1')
> ?
> 
> So it has been encoded using isolatin1.  I really don't understand why.
> I'll have to investigate this further.

That's why I tested both my efforts with a euro symbol that I entered
via the Compose key + E= .. which generates 0x20AC in a UTF-8 setup.

> If I change the line:
> 
>    setlocale(LC_ALL, "");                 /* make sure UTF8       */
> 
> to
> 
>    setlocale(LC_ALL, "en_GB.UTF-8");       /* make sure UTF8       */
> 
> then the behaviour is the same as before (i.e. get_wch() gets called
> twice instantly).
> 
> I'll do some more investigating (when I can think of *what* to
> investigate) and I will tell you my findings.

This is really strange.

I am absolutely certain that I had gotten my initial version, with the
old getch() .. etc. routines to work, but since I continued
experimenting with the same source snippet, I no longer had available to
investigate where I erred.

I copy/pasted the snippet back from my earlier post.. and so far I
haven't been able to get it work again.. :-(

The logic behind my assuming that getch() et al. should work
transparently in a UTF-8 context is that:

1. the 3NCURSES man pages are rather detailed and I could not find UTF-8
   or "unicode" mentioned anywhere apart from some obscure configuration
   option that is likely turned on everywhere by default.

2. More importantly, having to switch to the "wide character" macros or
   functions instead of the "narrow" versions would have meant that just
   about every application that uses ncurses would have had to be
   heavily patched - I would have imagined that all the changes would be
   made in the library in a transparent fashion so that the maintainers
   of such apps would only have had to link against the new ncurses
   lib..??? 

I'll keep you posted if I find something useful.

CJ



From clp2 at rebertia.com  Sun May 31 18:42:12 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 31 May 2009 15:42:12 -0700
Subject: Unzip Files
In-Reply-To: <09a73008-0b22-4d7e-8ca3-1a4eb235d421@e20g2000vbc.googlegroups.com>
References: <09a73008-0b22-4d7e-8ca3-1a4eb235d421@e20g2000vbc.googlegroups.com>
Message-ID: <50697b2c0905311542i7cc925dh37846b8674183709@mail.gmail.com>

On Sun, May 31, 2009 at 2:42 PM, Brock <btibert3 at gmail.com> wrote:
> Hi all,
>
> I am new to python, so please don't attack me if this question is easy
> or basic. ?How can I go about extracting the contents of a zip file to
> the same directory? ?Can I extend this question to a zip file that
> sits on the internet?
>
> Point being I need to work with the files inside the zipped file, and
> there are times when the file is already on my computer, and their
> others where the datafile sits on the Internet.
>
> Any help you can provide will be greatly appreciated. ?In full
> disclosure, I usually learn by example and not by trial and error, so
> any nudges in the right direction will be greatly appreciated.

See the extractall() method of ZipFile objects --
http://docs.python.org/library/zipfile.html

Cheers,
Chris
-- 
http://blog.rebertia.com


From python.list at tim.thechases.com  Sun May 31 18:43:45 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 31 May 2009 17:43:45 -0500
Subject: Unzip Files
In-Reply-To: <09a73008-0b22-4d7e-8ca3-1a4eb235d421@e20g2000vbc.googlegroups.com>
References: <09a73008-0b22-4d7e-8ca3-1a4eb235d421@e20g2000vbc.googlegroups.com>
Message-ID: <4A230821.7020008@tim.thechases.com>

> I am new to python, so please don't attack me if this question is easy
> or basic.  How can I go about extracting the contents of a zip file to
> the same directory?  Can I extend this question to a zip file that
> sits on the internet?

While the ZipFile object can take a file-like object, it looks 
like it expects to at least be able to seek() on that 
file-object.  The object you get back from a urlopen() call 
doesn't offer a seek(), so you can't directly use this object.

As such, you'd have to (1) download the remote .zip locally or 
(2) create your own urlopener (a'la urllib) that has a seek() 
method and uses HTTP Content-Range[1] if the server supports it. 
  Method #1 is fairly easy (especially if the file fits entirely 
within memory) but assumes the file isn't gargantuan because 
you're slurping the entire file over the network.  Method #2 
requires much crazier hacking skills but could produce serious 
gains if your file was mammoth.

> Point being I need to work with the files inside the zipped file, and
> there are times when the file is already on my computer, and their
> others where the datafile sits on the Internet.

I'd create a wrapper that checks if the passed "filename" is a 
URL or a filename.  If it's not a local file, download it to a 
local tempfile, and then proceed with that file the same as with 
the local file, only optionally deleting it when done.

Since the ZipFile can take any file-like that allows for seek(), 
memory permitting, you can even read the web-content into a 
cStringIO object without having to touch your filesystem.

-tkc

[1]
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.16





From seattlehanks at yahoo.com  Sun May 31 18:44:29 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 15:44:29 -0700 (PDT)
Subject: Metaclass mystery
References: <31ff6dcb-7dce-4262-a834-a81196b33bbe@w40g2000yqd.googlegroups.com>
	<m2eiu52102.fsf@googlemail.com>
	<be36c91d-51f7-4675-8de1-63de60b1385b@n21g2000vba.googlegroups.com>
	<eaf75582-0d22-4b31-b0e7-b8e5baa5c3b6@s21g2000vbb.googlegroups.com> 
	<gvurb6$ieu$1@panix3.panix.com>
Message-ID: <433738df-e6d3-4c77-bf06-c46958002173@h2g2000yqg.googlegroups.com>

On May 31, 2:03?pm, a... at pythoncraft.com (Aahz) wrote:
> In article <eaf75582-0d22-4b31-b0e7-b8e5baa5c... at s21g2000vbb.googlegroups.com>,
>
> LittleGrasshopper ?<seattleha... at yahoo.com> wrote:
> >> On May 31, 12:19=A0am, Arnaud Delobelle <arno... at googlemail.com> wrote:
>
> >>> [1]http://www.python.org/download/releases/2.2.3/descrintro/
>
> >I'm about 2/3 of the way through this paper (although I don't claim to
> >understand all of it.) There is some heavy duty material in there,
> >enough to make me feel really stupid and frustrated at times. I'm
> >making connections as I go though, hopefully everything will sink in
> >eventually.
>
> >Is this stuff actually tough, or am I just a dummy?
>
> Definitely tough! ?Metaclasses can cause dain bramage.
> --
> Aahz (a... at pythoncraft.com) ? ? ? ? ? <*> ? ? ? ?http://www.pythoncraft.com/
>
> my-python-code-runs-5x-faster-this-month-thanks-to-dumping-$2K-
> ? ? on-a-new-machine-ly y'rs ?- tim

Good to know, I'll stick to it and persevere. Will check doctor
regularly for dain bramage though.


From seattlehanks at yahoo.com  Sun May 31 18:52:21 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 15:52:21 -0700 (PDT)
Subject: Simple metaclass code failing
Message-ID: <41ef2397-6e9b-48b1-a818-60991244cea7@f19g2000yqo.googlegroups.com>

This is some simple code which I got from Guido's paper on the
unification of classes and types, which Arnaud suggested to improve my
knowledge of metaclasses:

class M1(type):
    pass
class M2(M1):
    pass
class M3(M2):
    pass
class C1:
    __metaclass__ = M1
class C2(C1):
    __metaclass__ = M2
class C3(C1, C2):
    __metaclass__ = M3

It is failing when processing C3:
Traceback (most recent call last):
  File "metaerror.py", line 18, in <module>
    class C3(C1, C2):
TypeError: Error when calling the metaclass bases
    Cannot create a consistent method resolution
order (MRO) for bases C2, C1

Since M3 is a subclass of M1 and M2 (which are the metaclasses for the
bases of C3, I don't understand the error. Then again, the error seems
to reference the MRO.

I hope this is one of those posts that I can look back in a few months
from now and think "Man, was that a dumb thing to ask!" Until then, I
would appreciate your help in trying to figure out what's going on.

Lukas


From seattlehanks at yahoo.com  Sun May 31 18:53:32 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 15:53:32 -0700 (PDT)
Subject: Simple metaclass code failing
References: 41ef2397-6e9b-48b1-a818-60991244cea7@f19g2000yqo.googlegroups.com
Message-ID: <16144e6c-4219-4ba2-ba6c-2da8737cbd07@g19g2000vbi.googlegroups.com>

On May 31, 3:52?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> This is some simple code which I got from Guido's paper on the
> unification of classes and types, which Arnaud suggested to improve my
> knowledge of metaclasses:
>
> class M1(type):
> ? ? pass
> class M2(M1):
> ? ? pass
> class M3(M2):
> ? ? pass
> class C1:
> ? ? __metaclass__ = M1
> class C2(C1):
> ? ? __metaclass__ = M2
> class C3(C1, C2):
> ? ? __metaclass__ = M3
>
> It is failing when processing C3:
> Traceback (most recent call last):
> ? File "metaerror.py", line 18, in <module>
> ? ? class C3(C1, C2):
> TypeError: Error when calling the metaclass bases
> ? ? Cannot create a consistent method resolution
> order (MRO) for bases C2, C1
>
> Since M3 is a subclass of M1 and M2 (which are the metaclasses for the
> bases of C3, I don't understand the error. Then again, the error seems
> to reference the MRO.
>
> I hope this is one of those posts that I can look back in a few months
> from now and think "Man, was that a dumb thing to ask!" Until then, I
> would appreciate your help in trying to figure out what's going on.
>
> Lukas

I forgot to say, this is Python 2.5.2 (in case that makes any
difference.)


From pavlovevidence at gmail.com  Sun May 31 18:59:36 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sun, 31 May 2009 15:59:36 -0700 (PDT)
Subject: Simple metaclass code failing
References: <41ef2397-6e9b-48b1-a818-60991244cea7@f19g2000yqo.googlegroups.com>
Message-ID: <991ff8ec-f38a-46db-9a40-93db8561337e@l12g2000yqo.googlegroups.com>

On May 31, 3:52?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> This is some simple code which I got from Guido's paper on the
> unification of classes and types, which Arnaud suggested to improve my
> knowledge of metaclasses:
>
> class M1(type):
> ? ? pass
> class M2(M1):
> ? ? pass
> class M3(M2):
> ? ? pass
> class C1:
> ? ? __metaclass__ = M1
> class C2(C1):
> ? ? __metaclass__ = M2
> class C3(C1, C2):
> ? ? __metaclass__ = M3
>
> It is failing when processing C3:
> Traceback (most recent call last):
> ? File "metaerror.py", line 18, in <module>
> ? ? class C3(C1, C2):
> TypeError: Error when calling the metaclass bases
> ? ? Cannot create a consistent method resolution
> order (MRO) for bases C2, C1
>
> Since M3 is a subclass of M1 and M2 (which are the metaclasses for the
> bases of C3, I don't understand the error. Then again, the error seems
> to reference the MRO.
>
> I hope this is one of those posts that I can look back in a few months
> from now and think "Man, was that a dumb thing to ask!" Until then, I
> would appreciate your help in trying to figure out what's going on.


http://www.python.org/download/releases/2.3/mro/


Carl Banks


From seattlehanks at yahoo.com  Sun May 31 19:11:56 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 16:11:56 -0700 (PDT)
Subject: Simple metaclass code failing
References: <41ef2397-6e9b-48b1-a818-60991244cea7@f19g2000yqo.googlegroups.com>
	<991ff8ec-f38a-46db-9a40-93db8561337e@l12g2000yqo.googlegroups.com>
Message-ID: <bba8de87-db5c-483e-b2b2-8a8f891830de@y9g2000yqg.googlegroups.com>

On May 31, 3:59?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On May 31, 3:52?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
>
>
> > This is some simple code which I got from Guido's paper on the
> > unification of classes and types, which Arnaud suggested to improve my
> > knowledge of metaclasses:
>
> > class M1(type):
> > ? ? pass
> > class M2(M1):
> > ? ? pass
> > class M3(M2):
> > ? ? pass
> > class C1:
> > ? ? __metaclass__ = M1
> > class C2(C1):
> > ? ? __metaclass__ = M2
> > class C3(C1, C2):
> > ? ? __metaclass__ = M3
>
> > It is failing when processing C3:
> > Traceback (most recent call last):
> > ? File "metaerror.py", line 18, in <module>
> > ? ? class C3(C1, C2):
> > TypeError: Error when calling the metaclass bases
> > ? ? Cannot create a consistent method resolution
> > order (MRO) for bases C2, C1
>
> > Since M3 is a subclass of M1 and M2 (which are the metaclasses for the
> > bases of C3, I don't understand the error. Then again, the error seems
> > to reference the MRO.
>
> > I hope this is one of those posts that I can look back in a few months
> > from now and think "Man, was that a dumb thing to ask!" Until then, I
> > would appreciate your help in trying to figure out what's going on.
>
> http://www.python.org/download/releases/2.3/mro/
>
> Carl Banks

Thank you, I'll read on that paper too in order to figure out what is
going on. I guess the resulting MROs do not satisfy monotonicity, I
just have to find out how to derive the MRO. I had the notion that it
was constructed by listing the current class, followed by the MROs of
each base in order, and then retaining the rightmost instance of each
class in the MRO list, but I think that might be an
oversimplification, since in this case that would be:
(C1, object)
(C2, C1, object)
(C3, C2, C1, object)
And I don't see any issues. But I'll read the paper to figure out what
the problem is, thanks.


From samwyse at gmail.com  Sun May 31 19:26:33 2009
From: samwyse at gmail.com (samwyse)
Date: Sun, 31 May 2009 16:26:33 -0700 (PDT)
Subject: How do I change the behavior of the 'python-docs' action in IDLE?
References: <166e0bf0-cb84-405c-84fb-d10abcd8d241@p4g2000vba.googlegroups.com>
Message-ID: <16b92b10-95cf-49ed-868c-8f66c8160e31@r3g2000vbp.googlegroups.com>

On Apr 16, 2:02?pm, samwyse <samw... at gmail.com> wrote:
> In the Windows version of Python 2.5, pressing F1 brought up the
> python.chm file. ?I've just installed 2.6, and the same action openshttp://www.python.org/doc/current/. ?I'd prefer the former behavior.
> I know how to change the key bindings in config-keys.def, but I think
> I want to change the action, not the key binding. ?Thanks.

I just installed Python 3.0.1 via the Windows 32-bit installer.
Opening "Python Docs" takes me to http://docs.python.org/dev/3.0/,
which doesn't exist.  Renaming python301.chm to python30.chm or
python300.chm doesn't seem to help find that file.  HELP!


From Scott.Daniels at Acm.Org  Sun May 31 19:37:17 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 31 May 2009 16:37:17 -0700
Subject: Generating all combinations
In-Reply-To: <mailman.956.1243808573.8015.python-list@python.org>
References: <78g79iF1l1i8bU1@mid.dfncis.de>	<J8ednQSAK9M6dL_XnZ2dnUVZ_judnZ2d@pdx.net>
	<mailman.956.1243808573.8015.python-list@python.org>
Message-ID: <Y_6dnRBjIqXXjr7XnZ2dnUVZ_oadnZ2d@pdx.net>

member thudfoo wrote:
> On 5/31/09, Scott David Daniels <Scott.Daniels at acm.org> wrote:
>> Johannes Bauer wrote:
>>> I'm trying to write a function in Python which ...
>>  Look here:
>>   http://docs.python.org/library/itertools.html#itertools.product
>> (new in 2.6, but code works in lower versions).
> How would one go about installing the python 2.6 itertools code in python 2.5?

Either copy the code from the documentation for itertools.product
(_very_ easy), or go to the source for 2.6 and get a copy of
.../Lib/itertools.py and save as some other name in site-packages,
and try using that (I'd use some name like itertools_26).

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at REMOVE-THIS-cybersource.com.au  Sun May 31 20:29:34 2009
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 01 Jun 2009 00:29:34 GMT
Subject: hash and __eq__
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>
	<m2skimcp3r.fsf@cs.uu.nl> <m2r5y61f5y.fsf@googlemail.com>
	<m2octacim1.fsf@cs.uu.nl> <m2iqjh23jq.fsf@googlemail.com>
	<003e1491$0$9723$c3e8da3@news.astraweb.com>
	<m263fh1qdq.fsf@googlemail.com>
Message-ID: <0233137f$0$8244$c3e8da3@news.astraweb.com>

On Sun, 31 May 2009 12:08:33 +0100, Arnaud Delobelle wrote:

> Anyway, it's good to know that quicksort is O(n^2) in the worst case -
> and that this worst case can crop up very easily in some situations,
> especially if not too much care has been taken implementing it.

The naive quicksort algorithm, where you recursively split the list into 
two halves, performs badly if the list is already sorted (or nearly so). 
It's easy to fix that: randomise the list before you sort! You can do 
that with a single pass of the list. That has the advantage of ensuring 
that no specific input can cause degraded performance, so an attacker 
can't DOS your application by passing sorted lists to be sorted.

Another strategy is to randomly exchange the pivot element when sorting. 
This avoids having to do a separate pass over the list, while still 
ensuring that no particular input can cause degraded performance.

A third strategy is to use a hybrid insertion/quicksort function. This is 
probably a good idea regardless, because for small lists, the overhead of 
quicksort generally makes insertion sort faster anyway. (CPython's sort 
used to be similar: it was a hybrid insertion/samplesort until, by 
memory, version 2.2, when it was changed for Timsort.)



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Sun May 31 21:33:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 31 May 2009 22:33:13 -0300
Subject: (windows) How to get information as string from a GreenHills
	project?
References: <a84b8eba-5082-4d9a-ab75-38d1466a2eee@s12g2000yqi.googlegroups.com>
Message-ID: <op.uutjm02px6zn5v@gabriel.sleipnir-bsas>

En Sat, 30 May 2009 23:28:23 -0300, Jebel <Jebel.Star at gmail.com> escribi?:

> I use python to start a GreenHills project in command line. And the
> GreenHills project create a string which is include the information
> that needed to be analyzed. How Can I return this string from
> GreenHills project to python?

I have no idea what a GreenHills project is. But if "create a string"
means that it outputs something on screen, try the subprocess module:
http://docs.python.org/library/subprocess.html (see the very first example)

-- 
Gabriel Genellina



From samwyse at gmail.com  Sun May 31 21:50:03 2009
From: samwyse at gmail.com (samwyse)
Date: Sun, 31 May 2009 18:50:03 -0700 (PDT)
Subject: Turning HTMLParser into an iterator
Message-ID: <94817710-8bca-4cad-84f5-32d3c5d44ce7@s21g2000vbb.googlegroups.com>

I'm processing some potentially large datasets stored as HTML.  I've
subclassed HTMLParser so that handle_endtag() accumulates data into a
list, which I can then fetch when everything's done.  I'd prefer,
however, to have handle_endtag() somehow yield values while the input
data is still streaming in.  I'm sure someone's done something like
this before, but I can't figure it out.  Can anyone help?  Thanks.


From Jebel.Star at gmail.com  Sun May 31 22:02:21 2009
From: Jebel.Star at gmail.com (Jebel)
Date: Sun, 31 May 2009 19:02:21 -0700 (PDT)
Subject: (windows) How to get information as string from a GreenHills 
	project?
References: <a84b8eba-5082-4d9a-ab75-38d1466a2eee@s12g2000yqi.googlegroups.com>
	<mailman.960.1243820013.8015.python-list@python.org>
Message-ID: <24f15146-e6e2-45a9-9d20-cc3562ccd221@c9g2000yqm.googlegroups.com>

On Jun 1, 9:33?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Sat, 30 May 2009 23:28:23 -0300, Jebel <Jebel.S... at gmail.com> escribi?:
>
> > I use python to start a GreenHills project in command line. And the
> > GreenHills project create a string which is include the information
> > that needed to be analyzed. How Can I return this string from
> > GreenHills project to python?
>
> I have no idea what a GreenHills project is. But if "create a string"
> means that it outputs something on screen, try the subprocess module:http://docs.python.org/library/subprocess.html(see the very first example)
>
> --
> Gabriel Genellina

Thank you Gabriel. I resolved this problem with os.popen().
Thank you very much.
By the way, a GreenHills project means a project built by
GreenHills,:)



From seattlehanks at yahoo.com  Sun May 31 22:11:59 2009
From: seattlehanks at yahoo.com (LittleGrasshopper)
Date: Sun, 31 May 2009 19:11:59 -0700 (PDT)
Subject: Simple metaclass code failing
References: <41ef2397-6e9b-48b1-a818-60991244cea7@f19g2000yqo.googlegroups.com>
	<991ff8ec-f38a-46db-9a40-93db8561337e@l12g2000yqo.googlegroups.com> 
	<bba8de87-db5c-483e-b2b2-8a8f891830de@y9g2000yqg.googlegroups.com>
Message-ID: <fad4b533-26ed-4e44-9f70-ab4e8df6fa93@j12g2000vbl.googlegroups.com>

On May 31, 4:11?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
> On May 31, 3:59?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>
>
>
> > On May 31, 3:52?pm, LittleGrasshopper <seattleha... at yahoo.com> wrote:
>
> > > This is some simple code which I got from Guido's paper on the
> > > unification of classes and types, which Arnaud suggested to improve my
> > > knowledge of metaclasses:
>
> > > class M1(type):
> > > ? ? pass
> > > class M2(M1):
> > > ? ? pass
> > > class M3(M2):
> > > ? ? pass
> > > class C1:
> > > ? ? __metaclass__ = M1
> > > class C2(C1):
> > > ? ? __metaclass__ = M2
> > > class C3(C1, C2):
> > > ? ? __metaclass__ = M3
>
> > > It is failing when processing C3:
> > > Traceback (most recent call last):
> > > ? File "metaerror.py", line 18, in <module>
> > > ? ? class C3(C1, C2):
> > > TypeError: Error when calling the metaclass bases
> > > ? ? Cannot create a consistent method resolution
> > > order (MRO) for bases C2, C1
>
> > > Since M3 is a subclass of M1 and M2 (which are the metaclasses for the
> > > bases of C3, I don't understand the error. Then again, the error seems
> > > to reference the MRO.
>
> > > I hope this is one of those posts that I can look back in a few months
> > > from now and think "Man, was that a dumb thing to ask!" Until then, I
> > > would appreciate your help in trying to figure out what's going on.
>
> >http://www.python.org/download/releases/2.3/mro/
>
> > Carl Banks
>
> Thank you, I'll read on that paper too in order to figure out what is
> going on. I guess the resulting MROs do not satisfy monotonicity, I
> just have to find out how to derive the MRO. I had the notion that it
> was constructed by listing the current class, followed by the MROs of
> each base in order, and then retaining the rightmost instance of each
> class in the MRO list, but I think that might be an
> oversimplification, since in this case that would be:
> (C1, object)
> (C2, C1, object)
> (C3, C2, C1, object)
> And I don't see any issues. But I'll read the paper to figure out what
> the problem is, thanks.

Thank you for pointing that paper. I read the paper and figured out
what was wrong (local precedence is not maintained.)


From samwyse at gmail.com  Sun May 31 22:40:36 2009
From: samwyse at gmail.com (samwyse)
Date: Sun, 31 May 2009 19:40:36 -0700 (PDT)
Subject: how to find the last decorator of a chain
References: <mailman.939.1243725387.8015.python-list@python.org>
Message-ID: <e83d006e-9eb2-4e34-8e37-f8726f4019e8@l12g2000yqo.googlegroups.com>

On May 30, 6:16?pm, Gabriel <gabr... at opensuse.org> wrote:

> I have something like this:
>
> @render(format="a")
> @render(format="b")
> @....
> def view(format, data):
> ? return data

> In my understanding this equivalent to:
>
> render('a',
> ?render('b',
> ? view(***)))

Not quite.  'render' is a function of one argument that returns a
decorator. So, the equivalent is more like this:
  view = render('a')(render('b')(view))
or more simply:
  fb = render('b')
  view = fb(view)
  fa = render('a')
  view = fa(view)

> Is there any way to know, in this case, that 'a' is the 'default' format?

Will this do?  (In case the formatting gets messed up, I've also
posted the code to http://python.pastebin.com/f7f229d9d)

##from functools import wraps

def render(c):
    def decorator(f):
##        @wraps(f)
        def wrapper(*args, **kwds):
            if getattr(wrapper, 'outermost', False):
                print('outer wrapper', c)
            else:
                print('inner wrapper', c)
            return f(*args, **kwds)
        return wrapper
    return decorator

def mark_as_top(f):
    print('marking', f)
    f.outermost = True
##    @wraps(f)
    return f

@mark_as_top
@render('a')
@render('b')
@render('c')
@render('d')
def f():
    pass

f()



From tjreedy at udel.edu  Sun May 31 23:04:09 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 31 May 2009 23:04:09 -0400
Subject: hash and __eq__
In-Reply-To: <0233137f$0$8244$c3e8da3@news.astraweb.com>
References: <eb0da6a8-09fb-4854-b131-7078ce6a344b@f19g2000yqo.googlegroups.com>	<m2skimcp3r.fsf@cs.uu.nl>
	<m2r5y61f5y.fsf@googlemail.com>	<m2octacim1.fsf@cs.uu.nl>
	<m2iqjh23jq.fsf@googlemail.com>	<003e1491$0$9723$c3e8da3@news.astraweb.com>	<m263fh1qdq.fsf@googlemail.com>
	<0233137f$0$8244$c3e8da3@news.astraweb.com>
Message-ID: <gvvgf7$ofu$1@ger.gmane.org>

Steven D'Aprano wrote:
> On Sun, 31 May 2009 12:08:33 +0100, Arnaud Delobelle wrote:
> 
>> Anyway, it's good to know that quicksort is O(n^2) in the worst case -
>> and that this worst case can crop up very easily in some situations,
>> especially if not too much care has been taken implementing it.
> 
> The naive quicksort algorithm, where you recursively split the list into 
> two halves, performs badly if the list is already sorted (or nearly so). 
> It's easy to fix that: randomise the list before you sort! You can do 
> that with a single pass of the list. That has the advantage of ensuring 
> that no specific input can cause degraded performance, so an attacker 
> can't DOS your application by passing sorted lists to be sorted.
> 
> Another strategy is to randomly exchange the pivot element when sorting. 
> This avoids having to do a separate pass over the list, while still 
> ensuring that no particular input can cause degraded performance.
> 
> A third strategy is to use a hybrid insertion/quicksort function. This is 
> probably a good idea regardless, because for small lists, the overhead of 
> quicksort generally makes insertion sort faster anyway. (CPython's sort 
> used to be similar: it was a hybrid insertion/samplesort until, by 
> memory, version 2.2, when it was changed for Timsort.

Which is hybrid binary insertion sort and mergesort, with b.i.s used for 
sublists less than 64 items.




From goldwamh at slu.edu  Sun May 31 23:28:12 2009
From: goldwamh at slu.edu (Michael H. Goldwasser)
Date: Sun, 31 May 2009 22:28:12 -0500
Subject: [Tutor] Challenge supporting custom deepcopy with inheritance
In-Reply-To: <1c2a2c590905311858x4fa7ec79t5a876c45b78ad6a1@mail.gmail.com>
References: <18978.63514.319199.287551@Michael-Goldwassers-Computer.local>
	<1c2a2c590905311858x4fa7ec79t5a876c45b78ad6a1@mail.gmail.com>
	<18978.5438.755496.633709@Michael-Goldwassers-Computer.local>
Message-ID: <18979.19148.208649.805972@Michael-Goldwassers-Computer.local>


Hi Kent,

Thanks for your thoughts. 

For the original example code, you are correct that we could make it
work by having B provide the one-arg constructor to match A's
constructor signature.  But I don't see this as a general solution.

Having B.__deepcopy__() make a call to A.__deepcopy__() assumes that A
supports __deepcopy__ either direclty or indirectly.  This is not
guaranteed as __deepcopy__ is not supported all the way back to the
object base class.  It could be that the author of A has guaranteed
that the syntax deepcopy(instanceA) is properly supported, but that
could be done by other means without an explicit __deepcopy__ (such as
relying on a true deep copy, or using getstate/setstate to affect both
pickling and deepcopy).

As another basic puzzle, consider a class definition for B where B has
a registry list that it doesn't want cloned for the new instance (but
it does want pickled when serialized).  This would seem to require
that B implement its own __deepcopy__.   We want to somehow rely on
the class definition for A to enact the cloning fo the state defined
by A.   But without knowing about how A supports the deepcopy
semantics, I don't see how to accomplish this goal.

class B(A):
    def __init__(self):
        self.__registry = []

    def register(self, obj):
        self.__registry.append(obj)

    def __deepcopy__(self, memo={}):
        dup =  ????     # would like something like A's version of deepcopy(self,memo)
                        # as our starting point but we need an instance of class B
                        # and B.__deepcopy__ masks our ability to rely on the
                        # inherited semantics of deepcopy(self)
        dup.__registry = []
        memo[id(self)] = dup
        return dup


On Sunday May 31, 2009, Kent Johnson wrote: 

>    On Sun, May 31, 2009 at 5:35 PM, Michael H. Goldwasser <goldwamh at slu.edu> wrote:
>    >
>    > Yesterday, I posted a question to python-list involving custom
>    > deepcopies in an inheritance hierarchy. ?I haven't received any
>    > responses, so I thought I'd cross-post to see if anyone on tutor
>    > has any thoughts.
>    >
>    > To avoid splitting the thread, I'll simply reference the original post at
>    > http://mail.python.org/pipermail/python-list/2009-May/714866.html
>    > and ask for responses to be sent there.
>    
>    Sorry, splitting the thread for you...
>    
>    ISTM that in general B.__deepcopy__() should call A.__deepcopy__() to
>    do the "A" part of the work. In your example, this won't work because
>    A.__deepcopy__() assumes that subclasses have a one-argument
>    constructor. So, I would say that B is not fulfilling the contract
>    assumed by A.
>    
>    What if you give B a one-arg constructor by making the bTag argument
>    optional? Then I think B.__deepcopy__() can call A.__deepcopy__(),
>    then do the "B" part of the copy on the result.
>    
>    Kent


       +-----------------------------------------------
       | Michael Goldwasser
       | Associate Professor
       | Dept. Mathematics and Computer Science
       | Saint Louis University
       | 220 North Grand Blvd.
       | St. Louis, MO 63103-2007
       |
       | Office: Ritter Hall 6
       | Email:  goldwamh at slu.edu
       | URL:    http://cs.slu.edu/~goldwasser
       | Phone:  (314) 977-7039
       | Fax:    (314) 977-1452